fs/ocfs2/xattr.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * xattr.c
   5  *
   6  * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
   7  *
   8  * CREDITS:
   9  * Lots of code in this file is copy from linux/fs/ext3/xattr.c.
  10  * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public
  14  * License version 2 as published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  */
  21
  22 #include <linux/capability.h>
  23 #include <linux/fs.h>
  24 #include <linux/types.h>
  25 #include <linux/slab.h>
  26 #include <linux/highmem.h>
  27 #include <linux/pagemap.h>
  28 #include <linux/uio.h>
  29 #include <linux/sched.h>
  30 #include <linux/splice.h>
  31 #include <linux/mount.h>
  32 #include <linux/writeback.h>
  33 #include <linux/falloc.h>
  34 #include <linux/sort.h>
  35 #include <linux/init.h>
  36 #include <linux/module.h>
  37 #include <linux/string.h>
  38 #include <linux/security.h>
  39
  40 #define MLOG_MASK_PREFIX ML_XATTR
  41 #include <cluster/masklog.h>
  42
  43 #include "ocfs2.h"
  44 #include "alloc.h"
  45 #include "blockcheck.h"
  46 #include "dlmglue.h"
  47 #include "file.h"
  48 #include "symlink.h"
  49 #include "sysfile.h"
  50 #include "inode.h"
  51 #include "journal.h"
  52 #include "ocfs2_fs.h"
  53 #include "suballoc.h"
  54 #include "uptodate.h"
  55 #include "buffer_head_io.h"
  56 #include "super.h"
  57 #include "xattr.h"
  58 #include "refcounttree.h"
  59 #include "acl.h"
  60
  61 struct ocfs2_xattr_def_value_root {
  62         struct ocfs2_xattr_value_root   xv;
  63         struct ocfs2_extent_rec         er;
  64 };
  65
  66 struct ocfs2_xattr_bucket {
  67         /* The inode these xattrs are associated with */
  68         struct inode *bu_inode;
  69
  70         /* The actual buffers that make up the bucket */
  71         struct buffer_head *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
  72
  73         /* How many blocks make up one bucket for this filesystem */
  74         int bu_blocks;
  75 };
  76
  77 struct ocfs2_xattr_set_ctxt {
  78         handle_t *handle;
  79         struct ocfs2_alloc_context *meta_ac;
  80         struct ocfs2_alloc_context *data_ac;
  81         struct ocfs2_cached_dealloc_ctxt dealloc;
  82 };
  83
  84 #define OCFS2_XATTR_ROOT_SIZE   (sizeof(struct ocfs2_xattr_def_value_root))
  85 #define OCFS2_XATTR_INLINE_SIZE 80
  86 #define OCFS2_XATTR_HEADER_GAP  4
  87 #define OCFS2_XATTR_FREE_IN_IBODY       (OCFS2_MIN_XATTR_INLINE_SIZE \
  88                                          - sizeof(struct ocfs2_xattr_header) \
  89                                          - OCFS2_XATTR_HEADER_GAP)
  90 #define OCFS2_XATTR_FREE_IN_BLOCK(ptr)  ((ptr)->i_sb->s_blocksize \
  91                                          - sizeof(struct ocfs2_xattr_block) \
  92                                          - sizeof(struct ocfs2_xattr_header) \
  93                                          - OCFS2_XATTR_HEADER_GAP)
  94
  95 static struct ocfs2_xattr_def_value_root def_xv = {
  96         .xv.xr_list.l_count = cpu_to_le16(1),
  97 };
  98
  99 struct xattr_handler *ocfs2_xattr_handlers[] = {
 100         &ocfs2_xattr_user_handler,
 101         &ocfs2_xattr_acl_access_handler,
 102         &ocfs2_xattr_acl_default_handler,
 103         &ocfs2_xattr_trusted_handler,
 104         &ocfs2_xattr_security_handler,
 105         NULL
 106 };
 107
 108 static struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
 109         [OCFS2_XATTR_INDEX_USER]        = &ocfs2_xattr_user_handler,
 110         [OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS]
 111                                         = &ocfs2_xattr_acl_access_handler,
 112         [OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
 113                                         = &ocfs2_xattr_acl_default_handler,
 114         [OCFS2_XATTR_INDEX_TRUSTED]     = &ocfs2_xattr_trusted_handler,
 115         [OCFS2_XATTR_INDEX_SECURITY]    = &ocfs2_xattr_security_handler,
 116 };
 117
 118 struct ocfs2_xattr_info {
 119         int name_index;
 120         const char *name;
 121         const void *value;
 122         size_t value_len;
 123 };
 124
 125 struct ocfs2_xattr_search {
 126         struct buffer_head *inode_bh;
 127         /*
 128          * xattr_bh point to the block buffer head which has extended attribute
 129          * when extended attribute in inode, xattr_bh is equal to inode_bh.
 130          */
 131         struct buffer_head *xattr_bh;
 132         struct ocfs2_xattr_header *header;
 133         struct ocfs2_xattr_bucket *bucket;
 134         void *base;
 135         void *end;
 136         struct ocfs2_xattr_entry *here;
 137         int not_found;
 138 };
 139
 140 /* Operations on struct ocfs2_xa_entry */
 141 struct ocfs2_xa_loc;
 142 struct ocfs2_xa_loc_operations {
 143         /*
 144          * Return a pointer to the appropriate buffer in loc->xl_storage
 145          * at the given offset from loc->xl_header.
 146          */
 147         void *(*xlo_offset_pointer)(struct ocfs2_xa_loc *loc, int offset);
 148
 149         /*
 150          * Remove the name+value at this location.  Do whatever is
 151          * appropriate with the remaining name+value pairs.
 152          */
 153         void (*xlo_wipe_namevalue)(struct ocfs2_xa_loc *loc);
 154 };
 155
 156 /*
 157  * Describes an xattr entry location.  This is a memory structure
 158  * tracking the on-disk structure.
 159  */
 160 struct ocfs2_xa_loc {
 161         /* The ocfs2_xattr_header inside the on-disk storage. Not NULL. */
 162         struct ocfs2_xattr_header *xl_header;
 163
 164         /* Bytes from xl_header to the end of the storage */
 165         int xl_size;
 166
 167         /*
 168          * The ocfs2_xattr_entry this location describes.  If this is
 169          * NULL, this location describes the on-disk structure where it
 170          * would have been.
 171          */
 172         struct ocfs2_xattr_entry *xl_entry;
 173
 174         /*
 175          * Internal housekeeping
 176          */
 177
 178         /* Buffer(s) containing this entry */
 179         void *xl_storage;
 180
 181         /* Operations on the storage backing this location */
 182         const struct ocfs2_xa_loc_operations *xl_ops;
 183 };
 184
 185 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
 186                                              struct ocfs2_xattr_header *xh,
 187                                              int index,
 188                                              int *block_off,
 189                                              int *new_offset);
 190
 191 static int ocfs2_xattr_block_find(struct inode *inode,
 192                                   int name_index,
 193                                   const char *name,
 194                                   struct ocfs2_xattr_search *xs);
 195 static int ocfs2_xattr_index_block_find(struct inode *inode,
 196                                         struct buffer_head *root_bh,
 197                                         int name_index,
 198                                         const char *name,
 199                                         struct ocfs2_xattr_search *xs);
 200
 201 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
 202                                         struct buffer_head *blk_bh,
 203                                         char *buffer,
 204                                         size_t buffer_size);
 205
 206 static int ocfs2_xattr_create_index_block(struct inode *inode,
 207                                           struct ocfs2_xattr_search *xs,
 208                                           struct ocfs2_xattr_set_ctxt *ctxt);
 209
 210 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
 211                                              struct ocfs2_xattr_info *xi,
 212                                              struct ocfs2_xattr_search *xs,
 213                                              struct ocfs2_xattr_set_ctxt *ctxt);
 214
 215 typedef int (xattr_tree_rec_func)(struct inode *inode,
 216                                   struct buffer_head *root_bh,
 217                                   u64 blkno, u32 cpos, u32 len, void *para);
 218 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
 219                                            struct buffer_head *root_bh,
 220                                            xattr_tree_rec_func *rec_func,
 221                                            void *para);
 222 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
 223                                         struct ocfs2_xattr_bucket *bucket,
 224                                         void *para);
 225 static int ocfs2_rm_xattr_cluster(struct inode *inode,
 226                                   struct buffer_head *root_bh,
 227                                   u64 blkno,
 228                                   u32 cpos,
 229                                   u32 len,
 230                                   void *para);
 231
 232 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
 233                                   u64 src_blk, u64 last_blk, u64 to_blk,
 234                                   unsigned int start_bucket,
 235                                   u32 *first_hash);
 236 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
 237                                         struct ocfs2_dinode *di,
 238                                         struct ocfs2_xattr_info *xi,
 239                                         struct ocfs2_xattr_search *xis,
 240                                         struct ocfs2_xattr_search *xbs,
 241                                         struct ocfs2_refcount_tree **ref_tree,
 242                                         int *meta_need,
 243                                         int *credits);
 244 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
 245                                            struct ocfs2_xattr_bucket *bucket,
 246                                            int offset,
 247                                            struct ocfs2_xattr_value_root **xv,
 248                                            struct buffer_head **bh);
 249
 250 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
 251 {
 252         return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
 253 }
 254
 255 static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
 256 {
 257         return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
 258 }
 259
 260 static inline u16 ocfs2_xattr_max_xe_in_bucket(struct super_block *sb)
 261 {
 262         u16 len = sb->s_blocksize -
 263                  offsetof(struct ocfs2_xattr_header, xh_entries);
 264
 265         return len / sizeof(struct ocfs2_xattr_entry);
 266 }
 267
 268 #define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
 269 #define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
 270 #define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
 271
 272 static struct ocfs2_xattr_bucket *ocfs2_xattr_bucket_new(struct inode *inode)
 273 {
 274         struct ocfs2_xattr_bucket *bucket;
 275         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
 276
 277         BUG_ON(blks > OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET);
 278
 279         bucket = kzalloc(sizeof(struct ocfs2_xattr_bucket), GFP_NOFS);
 280         if (bucket) {
 281                 bucket->bu_inode = inode;
 282                 bucket->bu_blocks = blks;
 283         }
 284
 285         return bucket;
 286 }
 287
 288 static void ocfs2_xattr_bucket_relse(struct ocfs2_xattr_bucket *bucket)
 289 {
 290         int i;
 291
 292         for (i = 0; i < bucket->bu_blocks; i++) {
 293                 brelse(bucket->bu_bhs[i]);
 294                 bucket->bu_bhs[i] = NULL;
 295         }
 296 }
 297
 298 static void ocfs2_xattr_bucket_free(struct ocfs2_xattr_bucket *bucket)
 299 {
 300         if (bucket) {
 301                 ocfs2_xattr_bucket_relse(bucket);
 302                 bucket->bu_inode = NULL;
 303                 kfree(bucket);
 304         }
 305 }
 306
 307 /*
 308  * A bucket that has never been written to disk doesn't need to be
 309  * read.  We just need the buffer_heads.  Don't call this for
 310  * buckets that are already on disk.  ocfs2_read_xattr_bucket() initializes
 311  * them fully.
 312  */
 313 static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
 314                                    u64 xb_blkno)
 315 {
 316         int i, rc = 0;
 317
 318         for (i = 0; i < bucket->bu_blocks; i++) {
 319                 bucket->bu_bhs[i] = sb_getblk(bucket->bu_inode->i_sb,
 320                                               xb_blkno + i);
 321                 if (!bucket->bu_bhs[i]) {
 322                         rc = -EIO;
 323                         mlog_errno(rc);
 324                         break;
 325                 }
 326
 327                 if (!ocfs2_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
 328                                            bucket->bu_bhs[i]))
 329                         ocfs2_set_new_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
 330                                                       bucket->bu_bhs[i]);
 331         }
 332
 333         if (rc)
 334                 ocfs2_xattr_bucket_relse(bucket);
 335         return rc;
 336 }
 337
 338 /* Read the xattr bucket at xb_blkno */
 339 static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
 340                                    u64 xb_blkno)
 341 {
 342         int rc;
 343
 344         rc = ocfs2_read_blocks(INODE_CACHE(bucket->bu_inode), xb_blkno,
 345                                bucket->bu_blocks, bucket->bu_bhs, 0,
 346                                NULL);
 347         if (!rc) {
 348                 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 349                 rc = ocfs2_validate_meta_ecc_bhs(bucket->bu_inode->i_sb,
 350                                                  bucket->bu_bhs,
 351                                                  bucket->bu_blocks,
 352                                                  &bucket_xh(bucket)->xh_check);
 353                 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 354                 if (rc)
 355                         mlog_errno(rc);
 356         }
 357
 358         if (rc)
 359                 ocfs2_xattr_bucket_relse(bucket);
 360         return rc;
 361 }
 362
 363 static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
 364                                              struct ocfs2_xattr_bucket *bucket,
 365                                              int type)
 366 {
 367         int i, rc = 0;
 368
 369         for (i = 0; i < bucket->bu_blocks; i++) {
 370                 rc = ocfs2_journal_access(handle,
 371                                           INODE_CACHE(bucket->bu_inode),
 372                                           bucket->bu_bhs[i], type);
 373                 if (rc) {
 374                         mlog_errno(rc);
 375                         break;
 376                 }
 377         }
 378
 379         return rc;
 380 }
 381
 382 static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
 383                                              struct ocfs2_xattr_bucket *bucket)
 384 {
 385         int i;
 386
 387         spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 388         ocfs2_compute_meta_ecc_bhs(bucket->bu_inode->i_sb,
 389                                    bucket->bu_bhs, bucket->bu_blocks,
 390                                    &bucket_xh(bucket)->xh_check);
 391         spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 392
 393         for (i = 0; i < bucket->bu_blocks; i++)
 394                 ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
 395 }
 396
 397 static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest,
 398                                          struct ocfs2_xattr_bucket *src)
 399 {
 400         int i;
 401         int blocksize = src->bu_inode->i_sb->s_blocksize;
 402
 403         BUG_ON(dest->bu_blocks != src->bu_blocks);
 404         BUG_ON(dest->bu_inode != src->bu_inode);
 405
 406         for (i = 0; i < src->bu_blocks; i++) {
 407                 memcpy(bucket_block(dest, i), bucket_block(src, i),
 408                        blocksize);
 409         }
 410 }
 411
 412 static int ocfs2_validate_xattr_block(struct super_block *sb,
 413                                       struct buffer_head *bh)
 414 {
 415         int rc;
 416         struct ocfs2_xattr_block *xb =
 417                 (struct ocfs2_xattr_block *)bh->b_data;
 418
 419         mlog(0, "Validating xattr block %llu\n",
 420              (unsigned long long)bh->b_blocknr);
 421
 422         BUG_ON(!buffer_uptodate(bh));
 423
 424         /*
 425          * If the ecc fails, we return the error but otherwise
 426          * leave the filesystem running.  We know any error is
 427          * local to this block.
 428          */
 429         rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &xb->xb_check);
 430         if (rc)
 431                 return rc;
 432
 433         /*
 434          * Errors after here are fatal
 435          */
 436
 437         if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
 438                 ocfs2_error(sb,
 439                             "Extended attribute block #%llu has bad "
 440                             "signature %.*s",
 441                             (unsigned long long)bh->b_blocknr, 7,
 442                             xb->xb_signature);
 443                 return -EINVAL;
 444         }
 445
 446         if (le64_to_cpu(xb->xb_blkno) != bh->b_blocknr) {
 447                 ocfs2_error(sb,
 448                             "Extended attribute block #%llu has an "
 449                             "invalid xb_blkno of %llu",
 450                             (unsigned long long)bh->b_blocknr,
 451                             (unsigned long long)le64_to_cpu(xb->xb_blkno));
 452                 return -EINVAL;
 453         }
 454
 455         if (le32_to_cpu(xb->xb_fs_generation) != OCFS2_SB(sb)->fs_generation) {
 456                 ocfs2_error(sb,
 457                             "Extended attribute block #%llu has an invalid "
 458                             "xb_fs_generation of #%u",
 459                             (unsigned long long)bh->b_blocknr,
 460                             le32_to_cpu(xb->xb_fs_generation));
 461                 return -EINVAL;
 462         }
 463
 464         return 0;
 465 }
 466
 467 static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
 468                                   struct buffer_head **bh)
 469 {
 470         int rc;
 471         struct buffer_head *tmp = *bh;
 472
 473         rc = ocfs2_read_block(INODE_CACHE(inode), xb_blkno, &tmp,
 474                               ocfs2_validate_xattr_block);
 475
 476         /* If ocfs2_read_block() got us a new bh, pass it up. */
 477         if (!rc && !*bh)
 478                 *bh = tmp;
 479
 480         return rc;
 481 }
 482
 483 static inline const char *ocfs2_xattr_prefix(int name_index)
 484 {
 485         struct xattr_handler *handler = NULL;
 486
 487         if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
 488                 handler = ocfs2_xattr_handler_map[name_index];
 489
 490         return handler ? handler->prefix : NULL;
 491 }
 492
 493 static u32 ocfs2_xattr_name_hash(struct inode *inode,
 494                                  const char *name,
 495                                  int name_len)
 496 {
 497         /* Get hash value of uuid from super block */
 498         u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
 499         int i;
 500
 501         /* hash extended attribute name */
 502         for (i = 0; i < name_len; i++) {
 503                 hash = (hash << OCFS2_HASH_SHIFT) ^
 504                        (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
 505                        *name++;
 506         }
 507
 508         return hash;
 509 }
 510
 511 /*
 512  * ocfs2_xattr_hash_entry()
 513  *
 514  * Compute the hash of an extended attribute.
 515  */
 516 static void ocfs2_xattr_hash_entry(struct inode *inode,
 517                                    struct ocfs2_xattr_header *header,
 518                                    struct ocfs2_xattr_entry *entry)
 519 {
 520         u32 hash = 0;
 521         char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
 522
 523         hash = ocfs2_xattr_name_hash(inode, name, entry->xe_name_len);
 524         entry->xe_name_hash = cpu_to_le32(hash);
 525
 526         return;
 527 }
 528
 529 static int ocfs2_xattr_entry_real_size(int name_len, size_t value_len)
 530 {
 531         int size = 0;
 532
 533         if (value_len <= OCFS2_XATTR_INLINE_SIZE)
 534                 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(value_len);
 535         else
 536                 size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
 537         size += sizeof(struct ocfs2_xattr_entry);
 538
 539         return size;
 540 }
 541
 542 int ocfs2_calc_security_init(struct inode *dir,
 543                              struct ocfs2_security_xattr_info *si,
 544                              int *want_clusters,
 545                              int *xattr_credits,
 546                              struct ocfs2_alloc_context **xattr_ac)
 547 {
 548         int ret = 0;
 549         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 550         int s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
 551                                                  si->value_len);
 552
 553         /*
 554          * The max space of security xattr taken inline is
 555          * 256(name) + 80(value) + 16(entry) = 352 bytes,
 556          * So reserve one metadata block for it is ok.
 557          */
 558         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
 559             s_size > OCFS2_XATTR_FREE_IN_IBODY) {
 560                 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
 561                 if (ret) {
 562                         mlog_errno(ret);
 563                         return ret;
 564                 }
 565                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
 566         }
 567
 568         /* reserve clusters for xattr value which will be set in B tree*/
 569         if (si->value_len > OCFS2_XATTR_INLINE_SIZE) {
 570                 int new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
 571                                                             si->value_len);
 572
 573                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
 574                                                            new_clusters);
 575                 *want_clusters += new_clusters;
 576         }
 577         return ret;
 578 }
 579
 580 int ocfs2_calc_xattr_init(struct inode *dir,
 581                           struct buffer_head *dir_bh,
 582                           int mode,
 583                           struct ocfs2_security_xattr_info *si,
 584                           int *want_clusters,
 585                           int *xattr_credits,
 586                           int *want_meta)
 587 {
 588         int ret = 0;
 589         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 590         int s_size = 0, a_size = 0, acl_len = 0, new_clusters;
 591
 592         if (si->enable)
 593                 s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
 594                                                      si->value_len);
 595
 596         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
 597                 acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
 598                                         OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
 599                                         "", NULL, 0);
 600                 if (acl_len > 0) {
 601                         a_size = ocfs2_xattr_entry_real_size(0, acl_len);
 602                         if (S_ISDIR(mode))
 603                                 a_size <<= 1;
 604                 } else if (acl_len != 0 && acl_len != -ENODATA) {
 605                         mlog_errno(ret);
 606                         return ret;
 607                 }
 608         }
 609
 610         if (!(s_size + a_size))
 611                 return ret;
 612
 613         /*
 614          * The max space of security xattr taken inline is
 615          * 256(name) + 80(value) + 16(entry) = 352 bytes,
 616          * The max space of acl xattr taken inline is
 617          * 80(value) + 16(entry) * 2(if directory) = 192 bytes,
 618          * when blocksize = 512, may reserve one more cluser for
 619          * xattr bucket, otherwise reserve one metadata block
 620          * for them is ok.
 621          * If this is a new directory with inline data,
 622          * we choose to reserve the entire inline area for
 623          * directory contents and force an external xattr block.
 624          */
 625         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
 626             (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
 627             (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
 628                 *want_meta = *want_meta + 1;
 629                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
 630         }
 631
 632         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE &&
 633             (s_size + a_size) > OCFS2_XATTR_FREE_IN_BLOCK(dir)) {
 634                 *want_clusters += 1;
 635                 *xattr_credits += ocfs2_blocks_per_xattr_bucket(dir->i_sb);
 636         }
 637
 638         /*
 639          * reserve credits and clusters for xattrs which has large value
 640          * and have to be set outside
 641          */
 642         if (si->enable && si->value_len > OCFS2_XATTR_INLINE_SIZE) {
 643                 new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
 644                                                         si->value_len);
 645                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
 646                                                            new_clusters);
 647                 *want_clusters += new_clusters;
 648         }
 649         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL &&
 650             acl_len > OCFS2_XATTR_INLINE_SIZE) {
 651                 /* for directory, it has DEFAULT and ACCESS two types of acls */
 652                 new_clusters = (S_ISDIR(mode) ? 2 : 1) *
 653                                 ocfs2_clusters_for_bytes(dir->i_sb, acl_len);
 654                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
 655                                                            new_clusters);
 656                 *want_clusters += new_clusters;
 657         }
 658
 659         return ret;
 660 }
 661
 662 static int ocfs2_xattr_extend_allocation(struct inode *inode,
 663                                          u32 clusters_to_add,
 664                                          struct ocfs2_xattr_value_buf *vb,
 665                                          struct ocfs2_xattr_set_ctxt *ctxt)
 666 {
 667         int status = 0;
 668         handle_t *handle = ctxt->handle;
 669         enum ocfs2_alloc_restarted why;
 670         u32 prev_clusters, logical_start = le32_to_cpu(vb->vb_xv->xr_clusters);
 671         struct ocfs2_extent_tree et;
 672
 673         mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
 674
 675         ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
 676
 677         status = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
 678                               OCFS2_JOURNAL_ACCESS_WRITE);
 679         if (status < 0) {
 680                 mlog_errno(status);
 681                 goto leave;
 682         }
 683
 684         prev_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
 685         status = ocfs2_add_clusters_in_btree(handle,
 686                                              &et,
 687                                              &logical_start,
 688                                              clusters_to_add,
 689                                              0,
 690                                              ctxt->data_ac,
 691                                              ctxt->meta_ac,
 692                                              &why);
 693         if (status < 0) {
 694                 mlog_errno(status);
 695                 goto leave;
 696         }
 697
 698         status = ocfs2_journal_dirty(handle, vb->vb_bh);
 699         if (status < 0) {
 700                 mlog_errno(status);
 701                 goto leave;
 702         }
 703
 704         clusters_to_add -= le32_to_cpu(vb->vb_xv->xr_clusters) - prev_clusters;
 705
 706         /*
 707          * We should have already allocated enough space before the transaction,
 708          * so no need to restart.
 709          */
 710         BUG_ON(why != RESTART_NONE || clusters_to_add);
 711
 712 leave:
 713
 714         return status;
 715 }
 716
 717 static int __ocfs2_remove_xattr_range(struct inode *inode,
 718                                       struct ocfs2_xattr_value_buf *vb,
 719                                       u32 cpos, u32 phys_cpos, u32 len,
 720                                       unsigned int ext_flags,
 721                                       struct ocfs2_xattr_set_ctxt *ctxt)
 722 {
 723         int ret;
 724         u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 725         handle_t *handle = ctxt->handle;
 726         struct ocfs2_extent_tree et;
 727
 728         ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
 729
 730         ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
 731                             OCFS2_JOURNAL_ACCESS_WRITE);
 732         if (ret) {
 733                 mlog_errno(ret);
 734                 goto out;
 735         }
 736
 737         ret = ocfs2_remove_extent(handle, &et, cpos, len, ctxt->meta_ac,
 738                                   &ctxt->dealloc);
 739         if (ret) {
 740                 mlog_errno(ret);
 741                 goto out;
 742         }
 743
 744         le32_add_cpu(&vb->vb_xv->xr_clusters, -len);
 745
 746         ret = ocfs2_journal_dirty(handle, vb->vb_bh);
 747         if (ret) {
 748                 mlog_errno(ret);
 749                 goto out;
 750         }
 751
 752         if (ext_flags & OCFS2_EXT_REFCOUNTED)
 753                 ret = ocfs2_decrease_refcount(inode, handle,
 754                                         ocfs2_blocks_to_clusters(inode->i_sb,
 755                                                                  phys_blkno),
 756                                         len, ctxt->meta_ac, &ctxt->dealloc, 1);
 757         else
 758                 ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc,
 759                                                   phys_blkno, len);
 760         if (ret)
 761                 mlog_errno(ret);
 762
 763 out:
 764         return ret;
 765 }
 766
 767 static int ocfs2_xattr_shrink_size(struct inode *inode,
 768                                    u32 old_clusters,
 769                                    u32 new_clusters,
 770                                    struct ocfs2_xattr_value_buf *vb,
 771                                    struct ocfs2_xattr_set_ctxt *ctxt)
 772 {
 773         int ret = 0;
 774         unsigned int ext_flags;
 775         u32 trunc_len, cpos, phys_cpos, alloc_size;
 776         u64 block;
 777
 778         if (old_clusters <= new_clusters)
 779                 return 0;
 780
 781         cpos = new_clusters;
 782         trunc_len = old_clusters - new_clusters;
 783         while (trunc_len) {
 784                 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
 785                                                &alloc_size,
 786                                                &vb->vb_xv->xr_list, &ext_flags);
 787                 if (ret) {
 788                         mlog_errno(ret);
 789                         goto out;
 790                 }
 791
 792                 if (alloc_size > trunc_len)
 793                         alloc_size = trunc_len;
 794
 795                 ret = __ocfs2_remove_xattr_range(inode, vb, cpos,
 796                                                  phys_cpos, alloc_size,
 797                                                  ext_flags, ctxt);
 798                 if (ret) {
 799                         mlog_errno(ret);
 800                         goto out;
 801                 }
 802
 803                 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 804                 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode),
 805                                                        block, alloc_size);
 806                 cpos += alloc_size;
 807                 trunc_len -= alloc_size;
 808         }
 809
 810 out:
 811         return ret;
 812 }
 813
 814 static int ocfs2_xattr_value_truncate(struct inode *inode,
 815                                       struct ocfs2_xattr_value_buf *vb,
 816                                       int len,
 817                                       struct ocfs2_xattr_set_ctxt *ctxt)
 818 {
 819         int ret;
 820         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
 821         u32 old_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
 822
 823         if (new_clusters == old_clusters)
 824                 return 0;
 825
 826         if (new_clusters > old_clusters)
 827                 ret = ocfs2_xattr_extend_allocation(inode,
 828                                                     new_clusters - old_clusters,
 829                                                     vb, ctxt);
 830         else
 831                 ret = ocfs2_xattr_shrink_size(inode,
 832                                               old_clusters, new_clusters,
 833                                               vb, ctxt);
 834
 835         return ret;
 836 }
 837
 838 static int ocfs2_xattr_list_entry(char *buffer, size_t size,
 839                                   size_t *result, const char *prefix,
 840                                   const char *name, int name_len)
 841 {
 842         char *p = buffer + *result;
 843         int prefix_len = strlen(prefix);
 844         int total_len = prefix_len + name_len + 1;
 845
 846         *result += total_len;
 847
 848         /* we are just looking for how big our buffer needs to be */
 849         if (!size)
 850                 return 0;
 851
 852         if (*result > size)
 853                 return -ERANGE;
 854
 855         memcpy(p, prefix, prefix_len);
 856         memcpy(p + prefix_len, name, name_len);
 857         p[prefix_len + name_len] = '\0';
 858
 859         return 0;
 860 }
 861
 862 static int ocfs2_xattr_list_entries(struct inode *inode,
 863                                     struct ocfs2_xattr_header *header,
 864                                     char *buffer, size_t buffer_size)
 865 {
 866         size_t result = 0;
 867         int i, type, ret;
 868         const char *prefix, *name;
 869
 870         for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
 871                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
 872                 type = ocfs2_xattr_get_type(entry);
 873                 prefix = ocfs2_xattr_prefix(type);
 874
 875                 if (prefix) {
 876                         name = (const char *)header +
 877                                 le16_to_cpu(entry->xe_name_offset);
 878
 879                         ret = ocfs2_xattr_list_entry(buffer, buffer_size,
 880                                                      &result, prefix, name,
 881                                                      entry->xe_name_len);
 882                         if (ret)
 883                                 return ret;
 884                 }
 885         }
 886
 887         return result;
 888 }
 889
 890 int ocfs2_has_inline_xattr_value_outside(struct inode *inode,
 891                                          struct ocfs2_dinode *di)
 892 {
 893         struct ocfs2_xattr_header *xh;
 894         int i;
 895
 896         xh = (struct ocfs2_xattr_header *)
 897                  ((void *)di + inode->i_sb->s_blocksize -
 898                  le16_to_cpu(di->i_xattr_inline_size));
 899
 900         for (i = 0; i < le16_to_cpu(xh->xh_count); i++)
 901                 if (!ocfs2_xattr_is_local(&xh->xh_entries[i]))
 902                         return 1;
 903
 904         return 0;
 905 }
 906
 907 static int ocfs2_xattr_ibody_list(struct inode *inode,
 908                                   struct ocfs2_dinode *di,
 909                                   char *buffer,
 910                                   size_t buffer_size)
 911 {
 912         struct ocfs2_xattr_header *header = NULL;
 913         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 914         int ret = 0;
 915
 916         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
 917                 return ret;
 918
 919         header = (struct ocfs2_xattr_header *)
 920                  ((void *)di + inode->i_sb->s_blocksize -
 921                  le16_to_cpu(di->i_xattr_inline_size));
 922
 923         ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
 924
 925         return ret;
 926 }
 927
 928 static int ocfs2_xattr_block_list(struct inode *inode,
 929                                   struct ocfs2_dinode *di,
 930                                   char *buffer,
 931                                   size_t buffer_size)
 932 {
 933         struct buffer_head *blk_bh = NULL;
 934         struct ocfs2_xattr_block *xb;
 935         int ret = 0;
 936
 937         if (!di->i_xattr_loc)
 938                 return ret;
 939
 940         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
 941                                      &blk_bh);
 942         if (ret < 0) {
 943                 mlog_errno(ret);
 944                 return ret;
 945         }
 946
 947         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
 948         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
 949                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
 950                 ret = ocfs2_xattr_list_entries(inode, header,
 951                                                buffer, buffer_size);
 952         } else
 953                 ret = ocfs2_xattr_tree_list_index_block(inode, blk_bh,
 954                                                    buffer, buffer_size);
 955
 956         brelse(blk_bh);
 957
 958         return ret;
 959 }
 960
 961 ssize_t ocfs2_listxattr(struct dentry *dentry,
 962                         char *buffer,
 963                         size_t size)
 964 {
 965         int ret = 0, i_ret = 0, b_ret = 0;
 966         struct buffer_head *di_bh = NULL;
 967         struct ocfs2_dinode *di = NULL;
 968         struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
 969
 970         if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
 971                 return -EOPNOTSUPP;
 972
 973         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
 974                 return ret;
 975
 976         ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
 977         if (ret < 0) {
 978                 mlog_errno(ret);
 979                 return ret;
 980         }
 981
 982         di = (struct ocfs2_dinode *)di_bh->b_data;
 983
 984         down_read(&oi->ip_xattr_sem);
 985         i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
 986         if (i_ret < 0)
 987                 b_ret = 0;
 988         else {
 989                 if (buffer) {
 990                         buffer += i_ret;
 991                         size -= i_ret;
 992                 }
 993                 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
 994                                                buffer, size);
 995                 if (b_ret < 0)
 996                         i_ret = 0;
 997         }
 998         up_read(&oi->ip_xattr_sem);
 999         ocfs2_inode_unlock(dentry->d_inode, 0);
1000
1001         brelse(di_bh);
1002
1003         return i_ret + b_ret;
1004 }
1005
1006 static int ocfs2_xattr_find_entry(int name_index,
1007                                   const char *name,
1008                                   struct ocfs2_xattr_search *xs)
1009 {
1010         struct ocfs2_xattr_entry *entry;
1011         size_t name_len;
1012         int i, cmp = 1;
1013
1014         if (name == NULL)
1015                 return -EINVAL;
1016
1017         name_len = strlen(name);
1018         entry = xs->here;
1019         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
1020                 cmp = name_index - ocfs2_xattr_get_type(entry);
1021                 if (!cmp)
1022                         cmp = name_len - entry->xe_name_len;
1023                 if (!cmp)
1024                         cmp = memcmp(name, (xs->base +
1025                                      le16_to_cpu(entry->xe_name_offset)),
1026                                      name_len);
1027                 if (cmp == 0)
1028                         break;
1029                 entry += 1;
1030         }
1031         xs->here = entry;
1032
1033         return cmp ? -ENODATA : 0;
1034 }
1035
1036 static int ocfs2_xattr_get_value_outside(struct inode *inode,
1037                                          struct ocfs2_xattr_value_root *xv,
1038                                          void *buffer,
1039                                          size_t len)
1040 {
1041         u32 cpos, p_cluster, num_clusters, bpc, clusters;
1042         u64 blkno;
1043         int i, ret = 0;
1044         size_t cplen, blocksize;
1045         struct buffer_head *bh = NULL;
1046         struct ocfs2_extent_list *el;
1047
1048         el = &xv->xr_list;
1049         clusters = le32_to_cpu(xv->xr_clusters);
1050         bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1051         blocksize = inode->i_sb->s_blocksize;
1052
1053         cpos = 0;
1054         while (cpos < clusters) {
1055                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1056                                                &num_clusters, el, NULL);
1057                 if (ret) {
1058                         mlog_errno(ret);
1059                         goto out;
1060                 }
1061
1062                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1063                 /* Copy ocfs2_xattr_value */
1064                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1065                         ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1066                                                &bh, NULL);
1067                         if (ret) {
1068                                 mlog_errno(ret);
1069                                 goto out;
1070                         }
1071
1072                         cplen = len >= blocksize ? blocksize : len;
1073                         memcpy(buffer, bh->b_data, cplen);
1074                         len -= cplen;
1075                         buffer += cplen;
1076
1077                         brelse(bh);
1078                         bh = NULL;
1079                         if (len == 0)
1080                                 break;
1081                 }
1082                 cpos += num_clusters;
1083         }
1084 out:
1085         return ret;
1086 }
1087
1088 static int ocfs2_xattr_ibody_get(struct inode *inode,
1089                                  int name_index,
1090                                  const char *name,
1091                                  void *buffer,
1092                                  size_t buffer_size,
1093                                  struct ocfs2_xattr_search *xs)
1094 {
1095         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1096         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1097         struct ocfs2_xattr_value_root *xv;
1098         size_t size;
1099         int ret = 0;
1100
1101         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
1102                 return -ENODATA;
1103
1104         xs->end = (void *)di + inode->i_sb->s_blocksize;
1105         xs->header = (struct ocfs2_xattr_header *)
1106                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1107         xs->base = (void *)xs->header;
1108         xs->here = xs->header->xh_entries;
1109
1110         ret = ocfs2_xattr_find_entry(name_index, name, xs);
1111         if (ret)
1112                 return ret;
1113         size = le64_to_cpu(xs->here->xe_value_size);
1114         if (buffer) {
1115                 if (size > buffer_size)
1116                         return -ERANGE;
1117                 if (ocfs2_xattr_is_local(xs->here)) {
1118                         memcpy(buffer, (void *)xs->base +
1119                                le16_to_cpu(xs->here->xe_name_offset) +
1120                                OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
1121                 } else {
1122                         xv = (struct ocfs2_xattr_value_root *)
1123                                 (xs->base + le16_to_cpu(
1124                                  xs->here->xe_name_offset) +
1125                                 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
1126                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1127                                                             buffer, size);
1128                         if (ret < 0) {
1129                                 mlog_errno(ret);
1130                                 return ret;
1131                         }
1132                 }
1133         }
1134
1135         return size;
1136 }
1137
1138 static int ocfs2_xattr_block_get(struct inode *inode,
1139                                  int name_index,
1140                                  const char *name,
1141                                  void *buffer,
1142                                  size_t buffer_size,
1143                                  struct ocfs2_xattr_search *xs)
1144 {
1145         struct ocfs2_xattr_block *xb;
1146         struct ocfs2_xattr_value_root *xv;
1147         size_t size;
1148         int ret = -ENODATA, name_offset, name_len, i;
1149         int uninitialized_var(block_off);
1150
1151         xs->bucket = ocfs2_xattr_bucket_new(inode);
1152         if (!xs->bucket) {
1153                 ret = -ENOMEM;
1154                 mlog_errno(ret);
1155                 goto cleanup;
1156         }
1157
1158         ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
1159         if (ret) {
1160                 mlog_errno(ret);
1161                 goto cleanup;
1162         }
1163
1164         if (xs->not_found) {
1165                 ret = -ENODATA;
1166                 goto cleanup;
1167         }
1168
1169         xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1170         size = le64_to_cpu(xs->here->xe_value_size);
1171         if (buffer) {
1172                 ret = -ERANGE;
1173                 if (size > buffer_size)
1174                         goto cleanup;
1175
1176                 name_offset = le16_to_cpu(xs->here->xe_name_offset);
1177                 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
1178                 i = xs->here - xs->header->xh_entries;
1179
1180                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
1181                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
1182                                                                 bucket_xh(xs->bucket),
1183                                                                 i,
1184                                                                 &block_off,
1185                                                                 &name_offset);
1186                         xs->base = bucket_block(xs->bucket, block_off);
1187                 }
1188                 if (ocfs2_xattr_is_local(xs->here)) {
1189                         memcpy(buffer, (void *)xs->base +
1190                                name_offset + name_len, size);
1191                 } else {
1192                         xv = (struct ocfs2_xattr_value_root *)
1193                                 (xs->base + name_offset + name_len);
1194                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1195                                                             buffer, size);
1196                         if (ret < 0) {
1197                                 mlog_errno(ret);
1198                                 goto cleanup;
1199                         }
1200                 }
1201         }
1202         ret = size;
1203 cleanup:
1204         ocfs2_xattr_bucket_free(xs->bucket);
1205
1206         brelse(xs->xattr_bh);
1207         xs->xattr_bh = NULL;
1208         return ret;
1209 }
1210
1211 int ocfs2_xattr_get_nolock(struct inode *inode,
1212                            struct buffer_head *di_bh,
1213                            int name_index,
1214                            const char *name,
1215                            void *buffer,
1216                            size_t buffer_size)
1217 {
1218         int ret;
1219         struct ocfs2_dinode *di = NULL;
1220         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1221         struct ocfs2_xattr_search xis = {
1222                 .not_found = -ENODATA,
1223         };
1224         struct ocfs2_xattr_search xbs = {
1225                 .not_found = -ENODATA,
1226         };
1227
1228         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1229                 return -EOPNOTSUPP;
1230
1231         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1232                 ret = -ENODATA;
1233
1234         xis.inode_bh = xbs.inode_bh = di_bh;
1235         di = (struct ocfs2_dinode *)di_bh->b_data;
1236
1237         down_read(&oi->ip_xattr_sem);
1238         ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
1239                                     buffer_size, &xis);
1240         if (ret == -ENODATA && di->i_xattr_loc)
1241                 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
1242                                             buffer_size, &xbs);
1243         up_read(&oi->ip_xattr_sem);
1244
1245         return ret;
1246 }
1247
1248 /* ocfs2_xattr_get()
1249  *
1250  * Copy an extended attribute into the buffer provided.
1251  * Buffer is NULL to compute the size of buffer required.
1252  */
1253 static int ocfs2_xattr_get(struct inode *inode,
1254                            int name_index,
1255                            const char *name,
1256                            void *buffer,
1257                            size_t buffer_size)
1258 {
1259         int ret;
1260         struct buffer_head *di_bh = NULL;
1261
1262         ret = ocfs2_inode_lock(inode, &di_bh, 0);
1263         if (ret < 0) {
1264                 mlog_errno(ret);
1265                 return ret;
1266         }
1267         ret = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
1268                                      name, buffer, buffer_size);
1269
1270         ocfs2_inode_unlock(inode, 0);
1271
1272         brelse(di_bh);
1273
1274         return ret;
1275 }
1276
1277 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
1278                                            handle_t *handle,
1279                                            struct ocfs2_xattr_value_buf *vb,
1280                                            const void *value,
1281                                            int value_len)
1282 {
1283         int ret = 0, i, cp_len;
1284         u16 blocksize = inode->i_sb->s_blocksize;
1285         u32 p_cluster, num_clusters;
1286         u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1287         u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
1288         u64 blkno;
1289         struct buffer_head *bh = NULL;
1290         unsigned int ext_flags;
1291         struct ocfs2_xattr_value_root *xv = vb->vb_xv;
1292
1293         BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
1294
1295         while (cpos < clusters) {
1296                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1297                                                &num_clusters, &xv->xr_list,
1298                                                &ext_flags);
1299                 if (ret) {
1300                         mlog_errno(ret);
1301                         goto out;
1302                 }
1303
1304                 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1305
1306                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1307
1308                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1309                         ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1310                                                &bh, NULL);
1311                         if (ret) {
1312                                 mlog_errno(ret);
1313                                 goto out;
1314                         }
1315
1316                         ret = ocfs2_journal_access(handle,
1317                                                    INODE_CACHE(inode),
1318                                                    bh,
1319                                                    OCFS2_JOURNAL_ACCESS_WRITE);
1320                         if (ret < 0) {
1321                                 mlog_errno(ret);
1322                                 goto out;
1323                         }
1324
1325                         cp_len = value_len > blocksize ? blocksize : value_len;
1326                         memcpy(bh->b_data, value, cp_len);
1327                         value_len -= cp_len;
1328                         value += cp_len;
1329                         if (cp_len < blocksize)
1330                                 memset(bh->b_data + cp_len, 0,
1331                                        blocksize - cp_len);
1332
1333                         ret = ocfs2_journal_dirty(handle, bh);
1334                         if (ret < 0) {
1335                                 mlog_errno(ret);
1336                                 goto out;
1337                         }
1338                         brelse(bh);
1339                         bh = NULL;
1340
1341                         /*
1342                          * XXX: do we need to empty all the following
1343                          * blocks in this cluster?
1344                          */
1345                         if (!value_len)
1346                                 break;
1347                 }
1348                 cpos += num_clusters;
1349         }
1350 out:
1351         brelse(bh);
1352
1353         return ret;
1354 }
1355
1356 static int ocfs2_xattr_cleanup(struct inode *inode,
1357                                handle_t *handle,
1358                                struct ocfs2_xattr_info *xi,
1359                                struct ocfs2_xattr_search *xs,
1360                                struct ocfs2_xattr_value_buf *vb,
1361                                size_t offs)
1362 {
1363         int ret = 0;
1364         size_t name_len = strlen(xi->name);
1365         void *val = xs->base + offs;
1366         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1367
1368         ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
1369                             OCFS2_JOURNAL_ACCESS_WRITE);
1370         if (ret) {
1371                 mlog_errno(ret);
1372                 goto out;
1373         }
1374         /* Decrease xattr count */
1375         le16_add_cpu(&xs->header->xh_count, -1);
1376         /* Remove the xattr entry and tree root which has already be set*/
1377         memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
1378         memset(val, 0, size);
1379
1380         ret = ocfs2_journal_dirty(handle, vb->vb_bh);
1381         if (ret < 0)
1382                 mlog_errno(ret);
1383 out:
1384         return ret;
1385 }
1386
1387 static int ocfs2_xattr_update_entry(struct inode *inode,
1388                                     handle_t *handle,
1389                                     struct ocfs2_xattr_info *xi,
1390                                     struct ocfs2_xattr_search *xs,
1391                                     struct ocfs2_xattr_value_buf *vb,
1392                                     size_t offs)
1393 {
1394         int ret;
1395
1396         ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
1397                             OCFS2_JOURNAL_ACCESS_WRITE);
1398         if (ret) {
1399                 mlog_errno(ret);
1400                 goto out;
1401         }
1402
1403         xs->here->xe_name_offset = cpu_to_le16(offs);
1404         xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1405         if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
1406                 ocfs2_xattr_set_local(xs->here, 1);
1407         else
1408                 ocfs2_xattr_set_local(xs->here, 0);
1409         ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1410
1411         ret = ocfs2_journal_dirty(handle, vb->vb_bh);
1412         if (ret < 0)
1413                 mlog_errno(ret);
1414 out:
1415         return ret;
1416 }
1417
1418 /*
1419  * ocfs2_xattr_set_value_outside()
1420  *
1421  * Set large size value in B tree.
1422  */
1423 static int ocfs2_xattr_set_value_outside(struct inode *inode,
1424                                          struct ocfs2_xattr_info *xi,
1425                                          struct ocfs2_xattr_search *xs,
1426                                          struct ocfs2_xattr_set_ctxt *ctxt,
1427                                          struct ocfs2_xattr_value_buf *vb,
1428                                          size_t offs)
1429 {
1430         size_t name_len = strlen(xi->name);
1431         void *val = xs->base + offs;
1432         struct ocfs2_xattr_value_root *xv = NULL;
1433         size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1434         int ret = 0;
1435
1436         memset(val, 0, size);
1437         memcpy(val, xi->name, name_len);
1438         xv = (struct ocfs2_xattr_value_root *)
1439                 (val + OCFS2_XATTR_SIZE(name_len));
1440         xv->xr_clusters = 0;
1441         xv->xr_last_eb_blk = 0;
1442         xv->xr_list.l_tree_depth = 0;
1443         xv->xr_list.l_count = cpu_to_le16(1);
1444         xv->xr_list.l_next_free_rec = 0;
1445         vb->vb_xv = xv;
1446
1447         ret = ocfs2_xattr_value_truncate(inode, vb, xi->value_len, ctxt);
1448         if (ret < 0) {
1449                 mlog_errno(ret);
1450                 return ret;
1451         }
1452         ret = ocfs2_xattr_update_entry(inode, ctxt->handle, xi, xs, vb, offs);
1453         if (ret < 0) {
1454                 mlog_errno(ret);
1455                 return ret;
1456         }
1457         ret = __ocfs2_xattr_set_value_outside(inode, ctxt->handle, vb,
1458                                               xi->value, xi->value_len);
1459         if (ret < 0)
1460                 mlog_errno(ret);
1461
1462         return ret;
1463 }
1464
1465 /*
1466  * Wipe the name+value pair and allow the storage to reclaim it.  This
1467  * must be followed by either removal of the entry or a call to
1468  * ocfs2_xa_add_namevalue().
1469  */
1470 static void ocfs2_xa_wipe_namevalue(struct ocfs2_xa_loc *loc)
1471 {
1472         loc->xl_ops->xlo_wipe_namevalue(loc);
1473 }
1474
1475 static void *ocfs2_xa_block_offset_pointer(struct ocfs2_xa_loc *loc,
1476                                            int offset)
1477 {
1478         BUG_ON(offset >= loc->xl_size);
1479         return (char *)loc->xl_header + offset;
1480 }
1481
1482 /*
1483  * Block storage for xattrs keeps the name+value pairs compacted.  When
1484  * we remove one, we have to shift any that preceded it towards the end.
1485  */
1486 static void ocfs2_xa_block_wipe_namevalue(struct ocfs2_xa_loc *loc)
1487 {
1488         int i, offset;
1489         int namevalue_offset, first_namevalue_offset, namevalue_size;
1490         struct ocfs2_xattr_entry *entry = loc->xl_entry;
1491         struct ocfs2_xattr_header *xh = loc->xl_header;
1492         u64 value_size = le64_to_cpu(entry->xe_value_size);
1493         int count = le16_to_cpu(xh->xh_count);
1494
1495         namevalue_offset = le16_to_cpu(entry->xe_name_offset);
1496         namevalue_size = OCFS2_XATTR_SIZE(entry->xe_name_len);
1497         if (value_size > OCFS2_XATTR_INLINE_SIZE)
1498                 namevalue_size += OCFS2_XATTR_ROOT_SIZE;
1499         else
1500                 namevalue_size += OCFS2_XATTR_SIZE(value_size);
1501
1502         for (i = 0, first_namevalue_offset = loc->xl_size;
1503              i < count; i++) {
1504                 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1505                 if (offset < first_namevalue_offset)
1506                         first_namevalue_offset = offset;
1507         }
1508
1509         /* Shift the name+value pairs */
1510         memmove((char *)xh + first_namevalue_offset + namevalue_size,
1511                 (char *)xh + first_namevalue_offset,
1512                 namevalue_offset - first_namevalue_offset);
1513         memset((char *)xh + first_namevalue_offset, 0, namevalue_size);
1514
1515         /* Now tell xh->xh_entries about it */
1516         for (i = 0; i < count; i++) {
1517                 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1518                 if (offset < namevalue_offset)
1519                         le16_add_cpu(&xh->xh_entries[i].xe_name_offset,
1520                                      namevalue_size);
1521         }
1522
1523         /*
1524          * Note that we don't update xh_free_start or xh_name_value_len
1525          * because they're not used in block-stored xattrs.
1526          */
1527 }
1528
1529 /*
1530  * Operations for xattrs stored in blocks.  This includes inline inode
1531  * storage and unindexed ocfs2_xattr_blocks.
1532  */
1533 static const struct ocfs2_xa_loc_operations ocfs2_xa_block_loc_ops = {
1534         .xlo_offset_pointer     = ocfs2_xa_block_offset_pointer,
1535         .xlo_wipe_namevalue     = ocfs2_xa_block_wipe_namevalue,
1536 };
1537
1538 static void *ocfs2_xa_bucket_offset_pointer(struct ocfs2_xa_loc *loc,
1539                                             int offset)
1540 {
1541         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1542         int block, block_offset;
1543
1544         BUG_ON(offset >= OCFS2_XATTR_BUCKET_SIZE);
1545
1546         /* The header is at the front of the bucket */
1547         block = offset >> bucket->bu_inode->i_sb->s_blocksize_bits;
1548         block_offset = offset % bucket->bu_inode->i_sb->s_blocksize;
1549
1550         return bucket_block(bucket, block) + block_offset;
1551 }
1552
1553 static void ocfs2_xa_bucket_wipe_namevalue(struct ocfs2_xa_loc *loc)
1554 {
1555         int namevalue_size;
1556         struct ocfs2_xattr_entry *entry = loc->xl_entry;
1557         u64 value_size = le64_to_cpu(entry->xe_value_size);
1558
1559         namevalue_size = OCFS2_XATTR_SIZE(entry->xe_name_len);
1560         if (value_size > OCFS2_XATTR_INLINE_SIZE)
1561                 namevalue_size += OCFS2_XATTR_ROOT_SIZE;
1562         else
1563                 namevalue_size += OCFS2_XATTR_SIZE(value_size);
1564
1565         le16_add_cpu(&loc->xl_header->xh_name_value_len, -namevalue_size);
1566 }
1567
1568 /* Operations for xattrs stored in buckets. */
1569 static const struct ocfs2_xa_loc_operations ocfs2_xa_bucket_loc_ops = {
1570         .xlo_offset_pointer     = ocfs2_xa_bucket_offset_pointer,
1571         .xlo_wipe_namevalue     = ocfs2_xa_bucket_wipe_namevalue,
1572 };
1573
1574 static void ocfs2_xa_remove_entry(struct ocfs2_xa_loc *loc)
1575 {
1576         ocfs2_xa_wipe_namevalue(loc);
1577 }
1578
1579 static void ocfs2_init_dinode_xa_loc(struct ocfs2_xa_loc *loc,
1580                                      struct inode *inode,
1581                                      struct buffer_head *bh,
1582                                      struct ocfs2_xattr_entry *entry)
1583 {
1584         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1585
1586         loc->xl_ops = &ocfs2_xa_block_loc_ops;
1587         loc->xl_storage = bh;
1588         loc->xl_entry = entry;
1589
1590         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
1591                 loc->xl_size = le16_to_cpu(di->i_xattr_inline_size);
1592         else {
1593                 BUG_ON(entry);
1594                 loc->xl_size = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
1595         }
1596         loc->xl_header =
1597                 (struct ocfs2_xattr_header *)(bh->b_data + bh->b_size -
1598                                               loc->xl_size);
1599 }
1600
1601 static void ocfs2_init_xattr_block_xa_loc(struct ocfs2_xa_loc *loc,
1602                                           struct buffer_head *bh,
1603                                           struct ocfs2_xattr_entry *entry)
1604 {
1605         struct ocfs2_xattr_block *xb =
1606                 (struct ocfs2_xattr_block *)bh->b_data;
1607
1608         BUG_ON(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED);
1609
1610         loc->xl_ops = &ocfs2_xa_block_loc_ops;
1611         loc->xl_storage = bh;
1612         loc->xl_header = &(xb->xb_attrs.xb_header);
1613         loc->xl_entry = entry;
1614         loc->xl_size = bh->b_size - offsetof(struct ocfs2_xattr_block,
1615                                              xb_attrs.xb_header);
1616 }
1617
1618 static void ocfs2_init_xattr_bucket_xa_loc(struct ocfs2_xa_loc *loc,
1619                                            struct ocfs2_xattr_bucket *bucket,
1620                                            struct ocfs2_xattr_entry *entry)
1621 {
1622         loc->xl_ops = &ocfs2_xa_bucket_loc_ops;
1623         loc->xl_storage = bucket;
1624         loc->xl_header = bucket_xh(bucket);
1625         loc->xl_entry = entry;
1626         loc->xl_size = OCFS2_XATTR_BUCKET_SIZE;
1627 }
1628
1629 /*
1630  * ocfs2_xattr_set_entry_local()
1631  *
1632  * Set, replace or remove extended attribute in local.
1633  */
1634 static void ocfs2_xattr_set_entry_local(struct inode *inode,
1635                                         struct ocfs2_xattr_info *xi,
1636                                         struct ocfs2_xattr_search *xs,
1637                                         struct ocfs2_xattr_entry *last,
1638                                         size_t min_offs)
1639 {
1640         size_t name_len = strlen(xi->name);
1641         int i;
1642         struct ocfs2_xa_loc loc;
1643
1644         if (xs->xattr_bh == xs->inode_bh)
1645                 ocfs2_init_dinode_xa_loc(&loc, inode, xs->inode_bh,
1646                                          xs->not_found ? NULL : xs->here);
1647         else
1648                 ocfs2_init_xattr_block_xa_loc(&loc, xs->xattr_bh,
1649                                               xs->not_found ? NULL : xs->here);
1650         if (xi->value && xs->not_found) {
1651                 /* Insert the new xattr entry. */
1652                 le16_add_cpu(&xs->header->xh_count, 1);
1653                 ocfs2_xattr_set_type(last, xi->name_index);
1654                 ocfs2_xattr_set_local(last, 1);
1655                 last->xe_name_len = name_len;
1656         } else {
1657                 void *first_val;
1658                 void *val;
1659                 size_t offs, size;
1660
1661                 first_val = xs->base + min_offs;
1662                 offs = le16_to_cpu(xs->here->xe_name_offset);
1663                 val = xs->base + offs;
1664
1665                 if (le64_to_cpu(xs->here->xe_value_size) >
1666                     OCFS2_XATTR_INLINE_SIZE)
1667                         size = OCFS2_XATTR_SIZE(name_len) +
1668                                 OCFS2_XATTR_ROOT_SIZE;
1669                 else
1670                         size = OCFS2_XATTR_SIZE(name_len) +
1671                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1672
1673                 if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
1674                                 OCFS2_XATTR_SIZE(xi->value_len)) {
1675                         /* The old and the new value have the
1676                            same size. Just replace the value. */
1677                         ocfs2_xattr_set_local(xs->here, 1);
1678                         xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1679                         /* Clear value bytes. */
1680                         memset(val + OCFS2_XATTR_SIZE(name_len),
1681                                0,
1682                                OCFS2_XATTR_SIZE(xi->value_len));
1683                         memcpy(val + OCFS2_XATTR_SIZE(name_len),
1684                                xi->value,
1685                                xi->value_len);
1686                         return;
1687                 }
1688
1689                 /* Remove the old name+value. */
1690                 ocfs2_xa_wipe_namevalue(&loc);
1691                 xs->here->xe_name_hash = 0;
1692                 xs->here->xe_name_offset = 0;
1693                 ocfs2_xattr_set_local(xs->here, 1);
1694                 xs->here->xe_value_size = 0;
1695
1696                 min_offs += size;
1697
1698                 if (!xi->value) {
1699                         /* Remove the old entry. */
1700                         i = le16_to_cpu(xs->header->xh_count) - 1;
1701                         last = &xs->header->xh_entries[i];
1702                         xs->header->xh_count = cpu_to_le16(i);
1703
1704                         memmove(xs->here, xs->here + 1,
1705                                 (void *)last - (void *)xs->here);
1706                         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
1707                 }
1708         }
1709         if (xi->value) {
1710                 /* Insert the new name+value. */
1711                 size_t size = OCFS2_XATTR_SIZE(name_len) +
1712                                 OCFS2_XATTR_SIZE(xi->value_len);
1713                 void *val = xs->base + min_offs - size;
1714
1715                 xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
1716                 memset(val, 0, size);
1717                 memcpy(val, xi->name, name_len);
1718                 memcpy(val + OCFS2_XATTR_SIZE(name_len),
1719                        xi->value,
1720                        xi->value_len);
1721                 xs->here->xe_value_size = cpu_to_le64(xi->value_len);
1722                 ocfs2_xattr_set_local(xs->here, 1);
1723                 ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
1724         }
1725
1726         return;
1727 }
1728
1729 /*
1730  * ocfs2_xattr_set_entry()
1731  *
1732  * Set extended attribute entry into inode or block.
1733  *
1734  * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
1735  * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
1736  * then set value in B tree with set_value_outside().
1737  */
1738 static int ocfs2_xattr_set_entry(struct inode *inode,
1739                                  struct ocfs2_xattr_info *xi,
1740                                  struct ocfs2_xattr_search *xs,
1741                                  struct ocfs2_xattr_set_ctxt *ctxt,
1742                                  int flag)
1743 {
1744         struct ocfs2_xattr_entry *last;
1745         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1746         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1747         size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
1748         size_t size_l = 0;
1749         handle_t *handle = ctxt->handle;
1750         int free, i, ret;
1751         struct ocfs2_xattr_info xi_l = {
1752                 .name_index = xi->name_index,
1753                 .name = xi->name,
1754                 .value = xi->value,
1755                 .value_len = xi->value_len,
1756         };
1757         struct ocfs2_xattr_value_buf vb = {
1758                 .vb_bh = xs->xattr_bh,
1759                 .vb_access = ocfs2_journal_access_di,
1760         };
1761
1762         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1763                 BUG_ON(xs->xattr_bh == xs->inode_bh);
1764                 vb.vb_access = ocfs2_journal_access_xb;
1765         } else
1766                 BUG_ON(xs->xattr_bh != xs->inode_bh);
1767
1768         /* Compute min_offs, last and free space. */
1769         last = xs->header->xh_entries;
1770
1771         for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
1772                 size_t offs = le16_to_cpu(last->xe_name_offset);
1773                 if (offs < min_offs)
1774                         min_offs = offs;
1775                 last += 1;
1776         }
1777
1778         free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
1779         if (free < 0)
1780                 return -EIO;
1781
1782         if (!xs->not_found) {
1783                 size_t size = 0;
1784                 if (ocfs2_xattr_is_local(xs->here))
1785                         size = OCFS2_XATTR_SIZE(name_len) +
1786                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1787                 else
1788                         size = OCFS2_XATTR_SIZE(name_len) +
1789                                 OCFS2_XATTR_ROOT_SIZE;
1790                 free += (size + sizeof(struct ocfs2_xattr_entry));
1791         }
1792         /* Check free space in inode or block */
1793         if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1794                 if (free < sizeof(struct ocfs2_xattr_entry) +
1795                            OCFS2_XATTR_SIZE(name_len) +
1796                            OCFS2_XATTR_ROOT_SIZE) {
1797                         ret = -ENOSPC;
1798                         goto out;
1799                 }
1800                 size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
1801                 xi_l.value = (void *)&def_xv;
1802                 xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
1803         } else if (xi->value) {
1804                 if (free < sizeof(struct ocfs2_xattr_entry) +
1805                            OCFS2_XATTR_SIZE(name_len) +
1806                            OCFS2_XATTR_SIZE(xi->value_len)) {
1807                         ret = -ENOSPC;
1808                         goto out;
1809                 }
1810         }
1811
1812         if (!xs->not_found) {
1813                 /* For existing extended attribute */
1814                 size_t size = OCFS2_XATTR_SIZE(name_len) +
1815                         OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
1816                 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1817                 void *val = xs->base + offs;
1818
1819                 if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
1820                         /* Replace existing local xattr with tree root */
1821                         ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
1822                                                             ctxt, &vb, offs);
1823                         if (ret < 0)
1824                                 mlog_errno(ret);
1825                         goto out;
1826                 } else if (!ocfs2_xattr_is_local(xs->here)) {
1827                         /* For existing xattr which has value outside */
1828                         vb.vb_xv = (struct ocfs2_xattr_value_root *)
1829                                 (val + OCFS2_XATTR_SIZE(name_len));
1830
1831                         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1832                                 /*
1833                                  * If new value need set outside also,
1834                                  * first truncate old value to new value,
1835                                  * then set new value with set_value_outside().
1836                                  */
1837                                 ret = ocfs2_xattr_value_truncate(inode,
1838                                                                  &vb,
1839                                                                  xi->value_len,
1840                                                                  ctxt);
1841                                 if (ret < 0) {
1842                                         mlog_errno(ret);
1843                                         goto out;
1844                                 }
1845
1846                                 ret = ocfs2_xattr_update_entry(inode,
1847                                                                handle,
1848                                                                xi,
1849                                                                xs,
1850                                                                &vb,
1851                                                                offs);
1852                                 if (ret < 0) {
1853                                         mlog_errno(ret);
1854                                         goto out;
1855                                 }
1856
1857                                 ret = __ocfs2_xattr_set_value_outside(inode,
1858                                                                 handle,
1859                                                                 &vb,
1860                                                                 xi->value,
1861                                                                 xi->value_len);
1862                                 if (ret < 0)
1863                                         mlog_errno(ret);
1864                                 goto out;
1865                         } else {
1866                                 /*
1867                                  * If new value need set in local,
1868                                  * just trucate old value to zero.
1869                                  */
1870                                  ret = ocfs2_xattr_value_truncate(inode,
1871                                                                   &vb,
1872                                                                   0,
1873                                                                   ctxt);
1874                                 if (ret < 0)
1875                                         mlog_errno(ret);
1876                         }
1877                 }
1878         }
1879
1880         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), xs->inode_bh,
1881                                       OCFS2_JOURNAL_ACCESS_WRITE);
1882         if (ret) {
1883                 mlog_errno(ret);
1884                 goto out;
1885         }
1886
1887         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1888                 ret = vb.vb_access(handle, INODE_CACHE(inode), vb.vb_bh,
1889                                    OCFS2_JOURNAL_ACCESS_WRITE);
1890                 if (ret) {
1891                         mlog_errno(ret);
1892                         goto out;
1893                 }
1894         }
1895
1896         /*
1897          * Set value in local, include set tree root in local.
1898          * This is the first step for value size >INLINE_SIZE.
1899          */
1900         ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
1901
1902         if (!(flag & OCFS2_INLINE_XATTR_FL)) {
1903                 ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
1904                 if (ret < 0) {
1905                         mlog_errno(ret);
1906                         goto out;
1907                 }
1908         }
1909
1910         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
1911             (flag & OCFS2_INLINE_XATTR_FL)) {
1912                 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1913                 unsigned int xattrsize = osb->s_xattr_inline_size;
1914
1915                 /*
1916                  * Adjust extent record count or inline data size
1917                  * to reserve space for extended attribute.
1918                  */
1919                 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1920                         struct ocfs2_inline_data *idata = &di->id2.i_data;
1921                         le16_add_cpu(&idata->id_count, -xattrsize);
1922                 } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
1923                         struct ocfs2_extent_list *el = &di->id2.i_list;
1924                         le16_add_cpu(&el->l_count, -(xattrsize /
1925                                         sizeof(struct ocfs2_extent_rec)));
1926                 }
1927                 di->i_xattr_inline_size = cpu_to_le16(xattrsize);
1928         }
1929         /* Update xattr flag */
1930         spin_lock(&oi->ip_lock);
1931         oi->ip_dyn_features |= flag;
1932         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
1933         spin_unlock(&oi->ip_lock);
1934
1935         ret = ocfs2_journal_dirty(handle, xs->inode_bh);
1936         if (ret < 0)
1937                 mlog_errno(ret);
1938
1939         if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
1940                 /*
1941                  * Set value outside in B tree.
1942                  * This is the second step for value size > INLINE_SIZE.
1943                  */
1944                 size_t offs = le16_to_cpu(xs->here->xe_name_offset);
1945                 ret = ocfs2_xattr_set_value_outside(inode, xi, xs, ctxt,
1946                                                     &vb, offs);
1947                 if (ret < 0) {
1948                         int ret2;
1949
1950                         mlog_errno(ret);
1951                         /*
1952                          * If set value outside failed, we have to clean
1953                          * the junk tree root we have already set in local.
1954                          */
1955                         ret2 = ocfs2_xattr_cleanup(inode, ctxt->handle,
1956                                                    xi, xs, &vb, offs);
1957                         if (ret2 < 0)
1958                                 mlog_errno(ret2);
1959                 }
1960         }
1961 out:
1962         return ret;
1963 }
1964
1965 /*
1966  * In xattr remove, if it is stored outside and refcounted, we may have
1967  * the chance to split the refcount tree. So need the allocators.
1968  */
1969 static int ocfs2_lock_xattr_remove_allocators(struct inode *inode,
1970                                         struct ocfs2_xattr_value_root *xv,
1971                                         struct ocfs2_caching_info *ref_ci,
1972                                         struct buffer_head *ref_root_bh,
1973                                         struct ocfs2_alloc_context **meta_ac,
1974                                         int *ref_credits)
1975 {
1976         int ret, meta_add = 0;
1977         u32 p_cluster, num_clusters;
1978         unsigned int ext_flags;
1979
1980         *ref_credits = 0;
1981         ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
1982                                        &num_clusters,
1983                                        &xv->xr_list,
1984                                        &ext_flags);
1985         if (ret) {
1986                 mlog_errno(ret);
1987                 goto out;
1988         }
1989
1990         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
1991                 goto out;
1992
1993         ret = ocfs2_refcounted_xattr_delete_need(inode, ref_ci,
1994                                                  ref_root_bh, xv,
1995                                                  &meta_add, ref_credits);
1996         if (ret) {
1997                 mlog_errno(ret);
1998                 goto out;
1999         }
2000
2001         ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
2002                                                 meta_add, meta_ac);
2003         if (ret)
2004                 mlog_errno(ret);
2005
2006 out:
2007         return ret;
2008 }
2009
2010 static int ocfs2_remove_value_outside(struct inode*inode,
2011                                       struct ocfs2_xattr_value_buf *vb,
2012                                       struct ocfs2_xattr_header *header,
2013                                       struct ocfs2_caching_info *ref_ci,
2014                                       struct buffer_head *ref_root_bh)
2015 {
2016         int ret = 0, i, ref_credits;
2017         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2018         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
2019         void *val;
2020
2021         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
2022
2023         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
2024                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
2025
2026                 if (ocfs2_xattr_is_local(entry))
2027                         continue;
2028
2029                 val = (void *)header +
2030                         le16_to_cpu(entry->xe_name_offset);
2031                 vb->vb_xv = (struct ocfs2_xattr_value_root *)
2032                         (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
2033
2034                 ret = ocfs2_lock_xattr_remove_allocators(inode, vb->vb_xv,
2035                                                          ref_ci, ref_root_bh,
2036                                                          &ctxt.meta_ac,
2037                                                          &ref_credits);
2038
2039                 ctxt.handle = ocfs2_start_trans(osb, ref_credits +
2040                                         ocfs2_remove_extent_credits(osb->sb));
2041                 if (IS_ERR(ctxt.handle)) {
2042                         ret = PTR_ERR(ctxt.handle);
2043                         mlog_errno(ret);
2044                         break;
2045                 }
2046
2047                 ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
2048                 if (ret < 0) {
2049                         mlog_errno(ret);
2050                         break;
2051                 }
2052
2053                 ocfs2_commit_trans(osb, ctxt.handle);
2054                 if (ctxt.meta_ac) {
2055                         ocfs2_free_alloc_context(ctxt.meta_ac);
2056                         ctxt.meta_ac = NULL;
2057                 }
2058         }
2059
2060         if (ctxt.meta_ac)
2061                 ocfs2_free_alloc_context(ctxt.meta_ac);
2062         ocfs2_schedule_truncate_log_flush(osb, 1);
2063         ocfs2_run_deallocs(osb, &ctxt.dealloc);
2064         return ret;
2065 }
2066
2067 static int ocfs2_xattr_ibody_remove(struct inode *inode,
2068                                     struct buffer_head *di_bh,
2069                                     struct ocfs2_caching_info *ref_ci,
2070                                     struct buffer_head *ref_root_bh)
2071 {
2072
2073         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2074         struct ocfs2_xattr_header *header;
2075         int ret;
2076         struct ocfs2_xattr_value_buf vb = {
2077                 .vb_bh = di_bh,
2078                 .vb_access = ocfs2_journal_access_di,
2079         };
2080
2081         header = (struct ocfs2_xattr_header *)
2082                  ((void *)di + inode->i_sb->s_blocksize -
2083                  le16_to_cpu(di->i_xattr_inline_size));
2084
2085         ret = ocfs2_remove_value_outside(inode, &vb, header,
2086                                          ref_ci, ref_root_bh);
2087
2088         return ret;
2089 }
2090
2091 struct ocfs2_rm_xattr_bucket_para {
2092         struct ocfs2_caching_info *ref_ci;
2093         struct buffer_head *ref_root_bh;
2094 };
2095
2096 static int ocfs2_xattr_block_remove(struct inode *inode,
2097                                     struct buffer_head *blk_bh,
2098                                     struct ocfs2_caching_info *ref_ci,
2099                                     struct buffer_head *ref_root_bh)
2100 {
2101         struct ocfs2_xattr_block *xb;
2102         int ret = 0;
2103         struct ocfs2_xattr_value_buf vb = {
2104                 .vb_bh = blk_bh,
2105                 .vb_access = ocfs2_journal_access_xb,
2106         };
2107         struct ocfs2_rm_xattr_bucket_para args = {
2108                 .ref_ci = ref_ci,
2109                 .ref_root_bh = ref_root_bh,
2110         };
2111
2112         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2113         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2114                 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
2115                 ret = ocfs2_remove_value_outside(inode, &vb, header,
2116                                                  ref_ci, ref_root_bh);
2117         } else
2118                 ret = ocfs2_iterate_xattr_index_block(inode,
2119                                                 blk_bh,
2120                                                 ocfs2_rm_xattr_cluster,
2121                                                 &args);
2122
2123         return ret;
2124 }
2125
2126 static int ocfs2_xattr_free_block(struct inode *inode,
2127                                   u64 block,
2128                                   struct ocfs2_caching_info *ref_ci,
2129                                   struct buffer_head *ref_root_bh)
2130 {
2131         struct inode *xb_alloc_inode;
2132         struct buffer_head *xb_alloc_bh = NULL;
2133         struct buffer_head *blk_bh = NULL;
2134         struct ocfs2_xattr_block *xb;
2135         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2136         handle_t *handle;
2137         int ret = 0;
2138         u64 blk, bg_blkno;
2139         u16 bit;
2140
2141         ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
2142         if (ret < 0) {
2143                 mlog_errno(ret);
2144                 goto out;
2145         }
2146
2147         ret = ocfs2_xattr_block_remove(inode, blk_bh, ref_ci, ref_root_bh);
2148         if (ret < 0) {
2149                 mlog_errno(ret);
2150                 goto out;
2151         }
2152
2153         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2154         blk = le64_to_cpu(xb->xb_blkno);
2155         bit = le16_to_cpu(xb->xb_suballoc_bit);
2156         bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2157
2158         xb_alloc_inode = ocfs2_get_system_file_inode(osb,
2159                                 EXTENT_ALLOC_SYSTEM_INODE,
2160                                 le16_to_cpu(xb->xb_suballoc_slot));
2161         if (!xb_alloc_inode) {
2162                 ret = -ENOMEM;
2163                 mlog_errno(ret);
2164                 goto out;
2165         }
2166         mutex_lock(&xb_alloc_inode->i_mutex);
2167
2168         ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
2169         if (ret < 0) {
2170                 mlog_errno(ret);
2171                 goto out_mutex;
2172         }
2173
2174         handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
2175         if (IS_ERR(handle)) {
2176                 ret = PTR_ERR(handle);
2177                 mlog_errno(ret);
2178                 goto out_unlock;
2179         }
2180
2181         ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
2182                                        bit, bg_blkno, 1);
2183         if (ret < 0)
2184                 mlog_errno(ret);
2185
2186         ocfs2_commit_trans(osb, handle);
2187 out_unlock:
2188         ocfs2_inode_unlock(xb_alloc_inode, 1);
2189         brelse(xb_alloc_bh);
2190 out_mutex:
2191         mutex_unlock(&xb_alloc_inode->i_mutex);
2192         iput(xb_alloc_inode);
2193 out:
2194         brelse(blk_bh);
2195         return ret;
2196 }
2197
2198 /*
2199  * ocfs2_xattr_remove()
2200  *
2201  * Free extended attribute resources associated with this inode.
2202  */
2203 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
2204 {
2205         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2206         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2207         struct ocfs2_refcount_tree *ref_tree = NULL;
2208         struct buffer_head *ref_root_bh = NULL;
2209         struct ocfs2_caching_info *ref_ci = NULL;
2210         handle_t *handle;
2211         int ret;
2212
2213         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2214                 return 0;
2215
2216         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
2217                 return 0;
2218
2219         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
2220                 ret = ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb),
2221                                                le64_to_cpu(di->i_refcount_loc),
2222                                                1, &ref_tree, &ref_root_bh);
2223                 if (ret) {
2224                         mlog_errno(ret);
2225                         goto out;
2226                 }
2227                 ref_ci = &ref_tree->rf_ci;
2228
2229         }
2230
2231         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2232                 ret = ocfs2_xattr_ibody_remove(inode, di_bh,
2233                                                ref_ci, ref_root_bh);
2234                 if (ret < 0) {
2235                         mlog_errno(ret);
2236                         goto out;
2237                 }
2238         }
2239
2240         if (di->i_xattr_loc) {
2241                 ret = ocfs2_xattr_free_block(inode,
2242                                              le64_to_cpu(di->i_xattr_loc),
2243                                              ref_ci, ref_root_bh);
2244                 if (ret < 0) {
2245                         mlog_errno(ret);
2246                         goto out;
2247                 }
2248         }
2249
2250         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
2251                                    OCFS2_INODE_UPDATE_CREDITS);
2252         if (IS_ERR(handle)) {
2253                 ret = PTR_ERR(handle);
2254                 mlog_errno(ret);
2255                 goto out;
2256         }
2257         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2258                                       OCFS2_JOURNAL_ACCESS_WRITE);
2259         if (ret) {
2260                 mlog_errno(ret);
2261                 goto out_commit;
2262         }
2263
2264         di->i_xattr_loc = 0;
2265
2266         spin_lock(&oi->ip_lock);
2267         oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
2268         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2269         spin_unlock(&oi->ip_lock);
2270
2271         ret = ocfs2_journal_dirty(handle, di_bh);
2272         if (ret < 0)
2273                 mlog_errno(ret);
2274 out_commit:
2275         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2276 out:
2277         if (ref_tree)
2278                 ocfs2_unlock_refcount_tree(OCFS2_SB(inode->i_sb), ref_tree, 1);
2279         brelse(ref_root_bh);
2280         return ret;
2281 }
2282
2283 static int ocfs2_xattr_has_space_inline(struct inode *inode,
2284                                         struct ocfs2_dinode *di)
2285 {
2286         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2287         unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
2288         int free;
2289
2290         if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
2291                 return 0;
2292
2293         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2294                 struct ocfs2_inline_data *idata = &di->id2.i_data;
2295                 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
2296         } else if (ocfs2_inode_is_fast_symlink(inode)) {
2297                 free = ocfs2_fast_symlink_chars(inode->i_sb) -
2298                         le64_to_cpu(di->i_size);
2299         } else {
2300                 struct ocfs2_extent_list *el = &di->id2.i_list;
2301                 free = (le16_to_cpu(el->l_count) -
2302                         le16_to_cpu(el->l_next_free_rec)) *
2303                         sizeof(struct ocfs2_extent_rec);
2304         }
2305         if (free >= xattrsize)
2306                 return 1;
2307
2308         return 0;
2309 }
2310
2311 /*
2312  * ocfs2_xattr_ibody_find()
2313  *
2314  * Find extended attribute in inode block and
2315  * fill search info into struct ocfs2_xattr_search.
2316  */
2317 static int ocfs2_xattr_ibody_find(struct inode *inode,
2318                                   int name_index,
2319                                   const char *name,
2320                                   struct ocfs2_xattr_search *xs)
2321 {
2322         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2323         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2324         int ret;
2325         int has_space = 0;
2326
2327         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2328                 return 0;
2329
2330         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2331                 down_read(&oi->ip_alloc_sem);
2332                 has_space = ocfs2_xattr_has_space_inline(inode, di);
2333                 up_read(&oi->ip_alloc_sem);
2334                 if (!has_space)
2335                         return 0;
2336         }
2337
2338         xs->xattr_bh = xs->inode_bh;
2339         xs->end = (void *)di + inode->i_sb->s_blocksize;
2340         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2341                 xs->header = (struct ocfs2_xattr_header *)
2342                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
2343         else
2344                 xs->header = (struct ocfs2_xattr_header *)
2345                         (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
2346         xs->base = (void *)xs->header;
2347         xs->here = xs->header->xh_entries;
2348
2349         /* Find the named attribute. */
2350         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2351                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2352                 if (ret && ret != -ENODATA)
2353                         return ret;
2354                 xs->not_found = ret;
2355         }
2356
2357         return 0;
2358 }
2359
2360 /*
2361  * ocfs2_xattr_ibody_set()
2362  *
2363  * Set, replace or remove an extended attribute into inode block.
2364  *
2365  */
2366 static int ocfs2_xattr_ibody_set(struct inode *inode,
2367                                  struct ocfs2_xattr_info *xi,
2368                                  struct ocfs2_xattr_search *xs,
2369                                  struct ocfs2_xattr_set_ctxt *ctxt)
2370 {
2371         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2372         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2373         int ret;
2374
2375         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2376                 return -ENOSPC;
2377
2378         down_write(&oi->ip_alloc_sem);
2379         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2380                 if (!ocfs2_xattr_has_space_inline(inode, di)) {
2381                         ret = -ENOSPC;
2382                         goto out;
2383                 }
2384         }
2385
2386         ret = ocfs2_xattr_set_entry(inode, xi, xs, ctxt,
2387                                 (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
2388 out:
2389         up_write(&oi->ip_alloc_sem);
2390
2391         return ret;
2392 }
2393
2394 /*
2395  * ocfs2_xattr_block_find()
2396  *
2397  * Find extended attribute in external block and
2398  * fill search info into struct ocfs2_xattr_search.
2399  */
2400 static int ocfs2_xattr_block_find(struct inode *inode,
2401                                   int name_index,
2402                                   const char *name,
2403                                   struct ocfs2_xattr_search *xs)
2404 {
2405         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2406         struct buffer_head *blk_bh = NULL;
2407         struct ocfs2_xattr_block *xb;
2408         int ret = 0;
2409
2410         if (!di->i_xattr_loc)
2411                 return ret;
2412
2413         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2414                                      &blk_bh);
2415         if (ret < 0) {
2416                 mlog_errno(ret);
2417                 return ret;
2418         }
2419
2420         xs->xattr_bh = blk_bh;
2421         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2422
2423         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2424                 xs->header = &xb->xb_attrs.xb_header;
2425                 xs->base = (void *)xs->header;
2426                 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2427                 xs->here = xs->header->xh_entries;
2428
2429                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2430         } else
2431                 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2432                                                    name_index,
2433                                                    name, xs);
2434
2435         if (ret && ret != -ENODATA) {
2436                 xs->xattr_bh = NULL;
2437                 goto cleanup;
2438         }
2439         xs->not_found = ret;
2440         return 0;
2441 cleanup:
2442         brelse(blk_bh);
2443
2444         return ret;
2445 }
2446
2447 static int ocfs2_create_xattr_block(handle_t *handle,
2448                                     struct inode *inode,
2449                                     struct buffer_head *inode_bh,
2450                                     struct ocfs2_alloc_context *meta_ac,
2451                                     struct buffer_head **ret_bh,
2452                                     int indexed)
2453 {
2454         int ret;
2455         u16 suballoc_bit_start;
2456         u32 num_got;
2457         u64 first_blkno;
2458         struct ocfs2_dinode *di =  (struct ocfs2_dinode *)inode_bh->b_data;
2459         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2460         struct buffer_head *new_bh = NULL;
2461         struct ocfs2_xattr_block *xblk;
2462
2463         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), inode_bh,
2464                                       OCFS2_JOURNAL_ACCESS_CREATE);
2465         if (ret < 0) {
2466                 mlog_errno(ret);
2467                 goto end;
2468         }
2469
2470         ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
2471                                    &suballoc_bit_start, &num_got,
2472                                    &first_blkno);
2473         if (ret < 0) {
2474                 mlog_errno(ret);
2475                 goto end;
2476         }
2477
2478         new_bh = sb_getblk(inode->i_sb, first_blkno);
2479         ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2480
2481         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode),
2482                                       new_bh,
2483                                       OCFS2_JOURNAL_ACCESS_CREATE);
2484         if (ret < 0) {
2485                 mlog_errno(ret);
2486                 goto end;
2487         }
2488
2489         /* Initialize ocfs2_xattr_block */
2490         xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2491         memset(xblk, 0, inode->i_sb->s_blocksize);
2492         strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2493         xblk->xb_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
2494         xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2495         xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
2496         xblk->xb_blkno = cpu_to_le64(first_blkno);
2497
2498         if (indexed) {
2499                 struct ocfs2_xattr_tree_root *xr = &xblk->xb_attrs.xb_root;
2500                 xr->xt_clusters = cpu_to_le32(1);
2501                 xr->xt_last_eb_blk = 0;
2502                 xr->xt_list.l_tree_depth = 0;
2503                 xr->xt_list.l_count = cpu_to_le16(
2504                                         ocfs2_xattr_recs_per_xb(inode->i_sb));
2505                 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2506                 xblk->xb_flags = cpu_to_le16(OCFS2_XATTR_INDEXED);
2507         }
2508
2509         ret = ocfs2_journal_dirty(handle, new_bh);
2510         if (ret < 0) {
2511                 mlog_errno(ret);
2512                 goto end;
2513         }
2514         di->i_xattr_loc = cpu_to_le64(first_blkno);
2515         ocfs2_journal_dirty(handle, inode_bh);
2516
2517         *ret_bh = new_bh;
2518         new_bh = NULL;
2519
2520 end:
2521         brelse(new_bh);
2522         return ret;
2523 }
2524
2525 /*
2526  * ocfs2_xattr_block_set()
2527  *
2528  * Set, replace or remove an extended attribute into external block.
2529  *
2530  */
2531 static int ocfs2_xattr_block_set(struct inode *inode,
2532                                  struct ocfs2_xattr_info *xi,
2533                                  struct ocfs2_xattr_search *xs,
2534                                  struct ocfs2_xattr_set_ctxt *ctxt)
2535 {
2536         struct buffer_head *new_bh = NULL;
2537         handle_t *handle = ctxt->handle;
2538         struct ocfs2_xattr_block *xblk = NULL;
2539         int ret;
2540
2541         if (!xs->xattr_bh) {
2542                 ret = ocfs2_create_xattr_block(handle, inode, xs->inode_bh,
2543                                                ctxt->meta_ac, &new_bh, 0);
2544                 if (ret) {
2545                         mlog_errno(ret);
2546                         goto end;
2547                 }
2548
2549                 xs->xattr_bh = new_bh;
2550                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2551                 xs->header = &xblk->xb_attrs.xb_header;
2552                 xs->base = (void *)xs->header;
2553                 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2554                 xs->here = xs->header->xh_entries;
2555         } else
2556                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2557
2558         if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2559                 /* Set extended attribute into external block */
2560                 ret = ocfs2_xattr_set_entry(inode, xi, xs, ctxt,
2561                                             OCFS2_HAS_XATTR_FL);
2562                 if (!ret || ret != -ENOSPC)
2563                         goto end;
2564
2565                 ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2566                 if (ret)
2567                         goto end;
2568         }
2569
2570         ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2571
2572 end:
2573
2574         return ret;
2575 }
2576
2577 /* Check whether the new xattr can be inserted into the inode. */
2578 static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2579                                        struct ocfs2_xattr_info *xi,
2580                                        struct ocfs2_xattr_search *xs)
2581 {
2582         u64 value_size;
2583         struct ocfs2_xattr_entry *last;
2584         int free, i;
2585         size_t min_offs = xs->end - xs->base;
2586
2587         if (!xs->header)
2588                 return 0;
2589
2590         last = xs->header->xh_entries;
2591
2592         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
2593                 size_t offs = le16_to_cpu(last->xe_name_offset);
2594                 if (offs < min_offs)
2595                         min_offs = offs;
2596                 last += 1;
2597         }
2598
2599         free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
2600         if (free < 0)
2601                 return 0;
2602
2603         BUG_ON(!xs->not_found);
2604
2605         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
2606                 value_size = OCFS2_XATTR_ROOT_SIZE;
2607         else
2608                 value_size = OCFS2_XATTR_SIZE(xi->value_len);
2609
2610         if (free >= sizeof(struct ocfs2_xattr_entry) +
2611                    OCFS2_XATTR_SIZE(strlen(xi->name)) + value_size)
2612                 return 1;
2613
2614         return 0;
2615 }
2616
2617 static int ocfs2_calc_xattr_set_need(struct inode *inode,
2618                                      struct ocfs2_dinode *di,
2619                                      struct ocfs2_xattr_info *xi,
2620                                      struct ocfs2_xattr_search *xis,
2621                                      struct ocfs2_xattr_search *xbs,
2622                                      int *clusters_need,
2623                                      int *meta_need,
2624                                      int *credits_need)
2625 {
2626         int ret = 0, old_in_xb = 0;
2627         int clusters_add = 0, meta_add = 0, credits = 0;
2628         struct buffer_head *bh = NULL;
2629         struct ocfs2_xattr_block *xb = NULL;
2630         struct ocfs2_xattr_entry *xe = NULL;
2631         struct ocfs2_xattr_value_root *xv = NULL;
2632         char *base = NULL;
2633         int name_offset, name_len = 0;
2634         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
2635                                                     xi->value_len);
2636         u64 value_size;
2637
2638         /*
2639          * Calculate the clusters we need to write.
2640          * No matter whether we replace an old one or add a new one,
2641          * we need this for writing.
2642          */
2643         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
2644                 credits += new_clusters *
2645                            ocfs2_clusters_to_blocks(inode->i_sb, 1);
2646
2647         if (xis->not_found && xbs->not_found) {
2648                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2649
2650                 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
2651                         clusters_add += new_clusters;
2652                         credits += ocfs2_calc_extend_credits(inode->i_sb,
2653                                                         &def_xv.xv.xr_list,
2654                                                         new_clusters);
2655                 }
2656
2657                 goto meta_guess;
2658         }
2659
2660         if (!xis->not_found) {
2661                 xe = xis->here;
2662                 name_offset = le16_to_cpu(xe->xe_name_offset);
2663                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
2664                 base = xis->base;
2665                 credits += OCFS2_INODE_UPDATE_CREDITS;
2666         } else {
2667                 int i, block_off = 0;
2668                 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
2669                 xe = xbs->here;
2670                 name_offset = le16_to_cpu(xe->xe_name_offset);
2671                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
2672                 i = xbs->here - xbs->header->xh_entries;
2673                 old_in_xb = 1;
2674
2675                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
2676                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
2677                                                         bucket_xh(xbs->bucket),
2678                                                         i, &block_off,
2679                                                         &name_offset);
2680                         base = bucket_block(xbs->bucket, block_off);
2681                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2682                 } else {
2683                         base = xbs->base;
2684                         credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
2685                 }
2686         }
2687
2688         /*
2689          * delete a xattr doesn't need metadata and cluster allocation.
2690          * so just calculate the credits and return.
2691          *
2692          * The credits for removing the value tree will be extended
2693          * by ocfs2_remove_extent itself.
2694          */
2695         if (!xi->value) {
2696                 if (!ocfs2_xattr_is_local(xe))
2697                         credits += ocfs2_remove_extent_credits(inode->i_sb);
2698
2699                 goto out;
2700         }
2701
2702         /* do cluster allocation guess first. */
2703         value_size = le64_to_cpu(xe->xe_value_size);
2704
2705         if (old_in_xb) {
2706                 /*
2707                  * In xattr set, we always try to set the xe in inode first,
2708                  * so if it can be inserted into inode successfully, the old
2709                  * one will be removed from the xattr block, and this xattr
2710                  * will be inserted into inode as a new xattr in inode.
2711                  */
2712                 if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
2713                         clusters_add += new_clusters;
2714                         credits += ocfs2_remove_extent_credits(inode->i_sb) +
2715                                     OCFS2_INODE_UPDATE_CREDITS;
2716                         if (!ocfs2_xattr_is_local(xe))
2717                                 credits += ocfs2_calc_extend_credits(
2718                                                         inode->i_sb,
2719                                                         &def_xv.xv.xr_list,
2720                                                         new_clusters);
2721                         goto out;
2722                 }
2723         }
2724
2725         if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
2726                 /* the new values will be stored outside. */
2727                 u32 old_clusters = 0;
2728
2729                 if (!ocfs2_xattr_is_local(xe)) {
2730                         old_clusters =  ocfs2_clusters_for_bytes(inode->i_sb,
2731                                                                  value_size);
2732                         xv = (struct ocfs2_xattr_value_root *)
2733                              (base + name_offset + name_len);
2734                         value_size = OCFS2_XATTR_ROOT_SIZE;
2735                 } else
2736                         xv = &def_xv.xv;
2737
2738                 if (old_clusters >= new_clusters) {
2739                         credits += ocfs2_remove_extent_credits(inode->i_sb);
2740                         goto out;
2741                 } else {
2742                         meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
2743                         clusters_add += new_clusters - old_clusters;
2744                         credits += ocfs2_calc_extend_credits(inode->i_sb,
2745                                                              &xv->xr_list,
2746                                                              new_clusters -
2747                                                              old_clusters);
2748                         if (value_size >= OCFS2_XATTR_ROOT_SIZE)
2749                                 goto out;
2750                 }
2751         } else {
2752                 /*
2753                  * Now the new value will be stored inside. So if the new
2754                  * value is smaller than the size of value root or the old
2755                  * value, we don't need any allocation, otherwise we have
2756                  * to guess metadata allocation.
2757                  */
2758                 if ((ocfs2_xattr_is_local(xe) && value_size >= xi->value_len) ||
2759                     (!ocfs2_xattr_is_local(xe) &&
2760                      OCFS2_XATTR_ROOT_SIZE >= xi->value_len))
2761                         goto out;
2762         }
2763
2764 meta_guess:
2765         /* calculate metadata allocation. */
2766         if (di->i_xattr_loc) {
2767                 if (!xbs->xattr_bh) {
2768                         ret = ocfs2_read_xattr_block(inode,
2769                                                      le64_to_cpu(di->i_xattr_loc),
2770                                                      &bh);
2771                         if (ret) {
2772                                 mlog_errno(ret);
2773                                 goto out;
2774                         }
2775
2776                         xb = (struct ocfs2_xattr_block *)bh->b_data;
2777                 } else
2778                         xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
2779
2780                 /*
2781                  * If there is already an xattr tree, good, we can calculate
2782                  * like other b-trees. Otherwise we may have the chance of
2783                  * create a tree, the credit calculation is borrowed from
2784                  * ocfs2_calc_extend_credits with root_el = NULL. And the
2785                  * new tree will be cluster based, so no meta is needed.
2786                  */
2787                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
2788                         struct ocfs2_extent_list *el =
2789                                  &xb->xb_attrs.xb_root.xt_list;
2790                         meta_add += ocfs2_extend_meta_needed(el);
2791                         credits += ocfs2_calc_extend_credits(inode->i_sb,
2792                                                              el, 1);
2793                 } else
2794                         credits += OCFS2_SUBALLOC_ALLOC + 1;
2795
2796                 /*
2797                  * This cluster will be used either for new bucket or for
2798                  * new xattr block.
2799                  * If the cluster size is the same as the bucket size, one
2800                  * more is needed since we may need to extend the bucket
2801                  * also.
2802                  */
2803                 clusters_add += 1;
2804                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2805                 if (OCFS2_XATTR_BUCKET_SIZE ==
2806                         OCFS2_SB(inode->i_sb)->s_clustersize) {
2807                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
2808                         clusters_add += 1;
2809                 }
2810         } else {
2811                 meta_add += 1;
2812                 credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
2813         }
2814 out:
2815         if (clusters_need)
2816                 *clusters_need = clusters_add;
2817         if (meta_need)
2818                 *meta_need = meta_add;
2819         if (credits_need)
2820                 *credits_need = credits;
2821         brelse(bh);
2822         return ret;
2823 }
2824
2825 static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
2826                                      struct ocfs2_dinode *di,
2827                                      struct ocfs2_xattr_info *xi,
2828                                      struct ocfs2_xattr_search *xis,
2829                                      struct ocfs2_xattr_search *xbs,
2830                                      struct ocfs2_xattr_set_ctxt *ctxt,
2831                                      int extra_meta,
2832                                      int *credits)
2833 {
2834         int clusters_add, meta_add, ret;
2835         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2836
2837         memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
2838
2839         ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
2840
2841         ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
2842                                         &clusters_add, &meta_add, credits);
2843         if (ret) {
2844                 mlog_errno(ret);
2845                 return ret;
2846         }
2847
2848         meta_add += extra_meta;
2849         mlog(0, "Set xattr %s, reserve meta blocks = %d, clusters = %d, "
2850              "credits = %d\n", xi->name, meta_add, clusters_add, *credits);
2851
2852         if (meta_add) {
2853                 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
2854                                                         &ctxt->meta_ac);
2855                 if (ret) {
2856                         mlog_errno(ret);
2857                         goto out;
2858                 }
2859         }
2860
2861         if (clusters_add) {
2862                 ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
2863                 if (ret)
2864                         mlog_errno(ret);
2865         }
2866 out:
2867         if (ret) {
2868                 if (ctxt->meta_ac) {
2869                         ocfs2_free_alloc_context(ctxt->meta_ac);
2870                         ctxt->meta_ac = NULL;
2871                 }
2872
2873                 /*
2874                  * We cannot have an error and a non null ctxt->data_ac.
2875                  */
2876         }
2877
2878         return ret;
2879 }
2880
2881 static int __ocfs2_xattr_set_handle(struct inode *inode,
2882                                     struct ocfs2_dinode *di,
2883                                     struct ocfs2_xattr_info *xi,
2884                                     struct ocfs2_xattr_search *xis,
2885                                     struct ocfs2_xattr_search *xbs,
2886                                     struct ocfs2_xattr_set_ctxt *ctxt)
2887 {
2888         int ret = 0, credits, old_found;
2889
2890         if (!xi->value) {
2891                 /* Remove existing extended attribute */
2892                 if (!xis->not_found)
2893                         ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
2894                 else if (!xbs->not_found)
2895                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2896         } else {
2897                 /* We always try to set extended attribute into inode first*/
2898                 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
2899                 if (!ret && !xbs->not_found) {
2900                         /*
2901                          * If succeed and that extended attribute existing in
2902                          * external block, then we will remove it.
2903                          */
2904                         xi->value = NULL;
2905                         xi->value_len = 0;
2906
2907                         old_found = xis->not_found;
2908                         xis->not_found = -ENODATA;
2909                         ret = ocfs2_calc_xattr_set_need(inode,
2910                                                         di,
2911                                                         xi,
2912                                                         xis,
2913                                                         xbs,
2914                                                         NULL,
2915                                                         NULL,
2916                                                         &credits);
2917                         xis->not_found = old_found;
2918                         if (ret) {
2919                                 mlog_errno(ret);
2920                                 goto out;
2921                         }
2922
2923                         ret = ocfs2_extend_trans(ctxt->handle, credits +
2924                                         ctxt->handle->h_buffer_credits);
2925                         if (ret) {
2926                                 mlog_errno(ret);
2927                                 goto out;
2928                         }
2929                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2930                 } else if (ret == -ENOSPC) {
2931                         if (di->i_xattr_loc && !xbs->xattr_bh) {
2932                                 ret = ocfs2_xattr_block_find(inode,
2933                                                              xi->name_index,
2934                                                              xi->name, xbs);
2935                                 if (ret)
2936                                         goto out;
2937
2938                                 old_found = xis->not_found;
2939                                 xis->not_found = -ENODATA;
2940                                 ret = ocfs2_calc_xattr_set_need(inode,
2941                                                                 di,
2942                                                                 xi,
2943                                                                 xis,
2944                                                                 xbs,
2945                                                                 NULL,
2946                                                                 NULL,
2947                                                                 &credits);
2948                                 xis->not_found = old_found;
2949                                 if (ret) {
2950                                         mlog_errno(ret);
2951                                         goto out;
2952                                 }
2953
2954                                 ret = ocfs2_extend_trans(ctxt->handle, credits +
2955                                         ctxt->handle->h_buffer_credits);
2956                                 if (ret) {
2957                                         mlog_errno(ret);
2958                                         goto out;
2959                                 }
2960                         }
2961                         /*
2962                          * If no space in inode, we will set extended attribute
2963                          * into external block.
2964                          */
2965                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
2966                         if (ret)
2967                                 goto out;
2968                         if (!xis->not_found) {
2969                                 /*
2970                                  * If succeed and that extended attribute
2971                                  * existing in inode, we will remove it.
2972                                  */
2973                                 xi->value = NULL;
2974                                 xi->value_len = 0;
2975                                 xbs->not_found = -ENODATA;
2976                                 ret = ocfs2_calc_xattr_set_need(inode,
2977                                                                 di,
2978                                                                 xi,
2979                                                                 xis,
2980                                                                 xbs,
2981                                                                 NULL,
2982                                                                 NULL,
2983                                                                 &credits);
2984                                 if (ret) {
2985                                         mlog_errno(ret);
2986                                         goto out;
2987                                 }
2988
2989                                 ret = ocfs2_extend_trans(ctxt->handle, credits +
2990                                                 ctxt->handle->h_buffer_credits);
2991                                 if (ret) {
2992                                         mlog_errno(ret);
2993                                         goto out;
2994                                 }
2995                                 ret = ocfs2_xattr_ibody_set(inode, xi,
2996                                                             xis, ctxt);
2997                         }
2998                 }
2999         }
3000
3001         if (!ret) {
3002                 /* Update inode ctime. */
3003                 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
3004                                               xis->inode_bh,
3005                                               OCFS2_JOURNAL_ACCESS_WRITE);
3006                 if (ret) {
3007                         mlog_errno(ret);
3008                         goto out;
3009                 }
3010
3011                 inode->i_ctime = CURRENT_TIME;
3012                 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3013                 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3014                 ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
3015         }
3016 out:
3017         return ret;
3018 }
3019
3020 /*
3021  * This function only called duing creating inode
3022  * for init security/acl xattrs of the new inode.
3023  * All transanction credits have been reserved in mknod.
3024  */
3025 int ocfs2_xattr_set_handle(handle_t *handle,
3026                            struct inode *inode,
3027                            struct buffer_head *di_bh,
3028                            int name_index,
3029                            const char *name,
3030                            const void *value,
3031                            size_t value_len,
3032                            int flags,
3033                            struct ocfs2_alloc_context *meta_ac,
3034                            struct ocfs2_alloc_context *data_ac)
3035 {
3036         struct ocfs2_dinode *di;
3037         int ret;
3038
3039         struct ocfs2_xattr_info xi = {
3040                 .name_index = name_index,
3041                 .name = name,
3042                 .value = value,
3043                 .value_len = value_len,
3044         };
3045
3046         struct ocfs2_xattr_search xis = {
3047                 .not_found = -ENODATA,
3048         };
3049
3050         struct ocfs2_xattr_search xbs = {
3051                 .not_found = -ENODATA,
3052         };
3053
3054         struct ocfs2_xattr_set_ctxt ctxt = {
3055                 .handle = handle,
3056                 .meta_ac = meta_ac,
3057                 .data_ac = data_ac,
3058         };
3059
3060         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3061                 return -EOPNOTSUPP;
3062
3063         /*
3064          * In extreme situation, may need xattr bucket when
3065          * block size is too small. And we have already reserved
3066          * the credits for bucket in mknod.
3067          */
3068         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
3069                 xbs.bucket = ocfs2_xattr_bucket_new(inode);
3070                 if (!xbs.bucket) {
3071                         mlog_errno(-ENOMEM);
3072                         return -ENOMEM;
3073                 }
3074         }
3075
3076         xis.inode_bh = xbs.inode_bh = di_bh;
3077         di = (struct ocfs2_dinode *)di_bh->b_data;
3078
3079         down_write(&OCFS2_I(inode)->ip_xattr_sem);
3080
3081         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3082         if (ret)
3083                 goto cleanup;
3084         if (xis.not_found) {
3085                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3086                 if (ret)
3087                         goto cleanup;
3088         }
3089
3090         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3091
3092 cleanup:
3093         up_write(&OCFS2_I(inode)->ip_xattr_sem);
3094         brelse(xbs.xattr_bh);
3095         ocfs2_xattr_bucket_free(xbs.bucket);
3096
3097         return ret;
3098 }
3099
3100 /*
3101  * ocfs2_xattr_set()
3102  *
3103  * Set, replace or remove an extended attribute for this inode.
3104  * value is NULL to remove an existing extended attribute, else either
3105  * create or replace an extended attribute.
3106  */
3107 int ocfs2_xattr_set(struct inode *inode,
3108                     int name_index,
3109                     const char *name,
3110                     const void *value,
3111                     size_t value_len,
3112                     int flags)
3113 {
3114         struct buffer_head *di_bh = NULL;
3115         struct ocfs2_dinode *di;
3116         int ret, credits, ref_meta = 0, ref_credits = 0;
3117         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3118         struct inode *tl_inode = osb->osb_tl_inode;
3119         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
3120         struct ocfs2_refcount_tree *ref_tree = NULL;
3121
3122         struct ocfs2_xattr_info xi = {
3123                 .name_index = name_index,
3124                 .name = name,
3125                 .value = value,
3126                 .value_len = value_len,
3127         };
3128
3129         struct ocfs2_xattr_search xis = {
3130                 .not_found = -ENODATA,
3131         };
3132
3133         struct ocfs2_xattr_search xbs = {
3134                 .not_found = -ENODATA,
3135         };
3136
3137         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3138                 return -EOPNOTSUPP;
3139
3140         /*
3141          * Only xbs will be used on indexed trees.  xis doesn't need a
3142          * bucket.
3143          */
3144         xbs.bucket = ocfs2_xattr_bucket_new(inode);
3145         if (!xbs.bucket) {
3146                 mlog_errno(-ENOMEM);
3147                 return -ENOMEM;
3148         }
3149
3150         ret = ocfs2_inode_lock(inode, &di_bh, 1);
3151         if (ret < 0) {
3152                 mlog_errno(ret);
3153                 goto cleanup_nolock;
3154         }
3155         xis.inode_bh = xbs.inode_bh = di_bh;
3156         di = (struct ocfs2_dinode *)di_bh->b_data;
3157
3158         down_write(&OCFS2_I(inode)->ip_xattr_sem);
3159         /*
3160          * Scan inode and external block to find the same name
3161          * extended attribute and collect search infomation.
3162          */
3163         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3164         if (ret)
3165                 goto cleanup;
3166         if (xis.not_found) {
3167                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3168                 if (ret)
3169                         goto cleanup;
3170         }
3171
3172         if (xis.not_found && xbs.not_found) {
3173                 ret = -ENODATA;
3174                 if (flags & XATTR_REPLACE)
3175                         goto cleanup;
3176                 ret = 0;
3177                 if (!value)
3178                         goto cleanup;
3179         } else {
3180                 ret = -EEXIST;
3181                 if (flags & XATTR_CREATE)
3182                         goto cleanup;
3183         }
3184
3185         /* Check whether the value is refcounted and do some prepartion. */
3186         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL &&
3187             (!xis.not_found || !xbs.not_found)) {
3188                 ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
3189                                                    &xis, &xbs, &ref_tree,
3190                                                    &ref_meta, &ref_credits);
3191                 if (ret) {
3192                         mlog_errno(ret);
3193                         goto cleanup;
3194                 }
3195         }
3196
3197         mutex_lock(&tl_inode->i_mutex);
3198
3199         if (ocfs2_truncate_log_needs_flush(osb)) {
3200                 ret = __ocfs2_flush_truncate_log(osb);
3201                 if (ret < 0) {
3202                         mutex_unlock(&tl_inode->i_mutex);
3203                         mlog_errno(ret);
3204                         goto cleanup;
3205                 }
3206         }
3207         mutex_unlock(&tl_inode->i_mutex);
3208
3209         ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
3210                                         &xbs, &ctxt, ref_meta, &credits);
3211         if (ret) {
3212                 mlog_errno(ret);
3213                 goto cleanup;
3214         }
3215
3216         /* we need to update inode's ctime field, so add credit for it. */
3217         credits += OCFS2_INODE_UPDATE_CREDITS;
3218         ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
3219         if (IS_ERR(ctxt.handle)) {
3220                 ret = PTR_ERR(ctxt.handle);
3221                 mlog_errno(ret);
3222                 goto cleanup;
3223         }
3224
3225         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3226
3227         ocfs2_commit_trans(osb, ctxt.handle);
3228
3229         if (ctxt.data_ac)
3230                 ocfs2_free_alloc_context(ctxt.data_ac);
3231         if (ctxt.meta_ac)
3232                 ocfs2_free_alloc_context(ctxt.meta_ac);
3233         if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
3234                 ocfs2_schedule_truncate_log_flush(osb, 1);
3235         ocfs2_run_deallocs(osb, &ctxt.dealloc);
3236
3237 cleanup:
3238         if (ref_tree)
3239                 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3240         up_write(&OCFS2_I(inode)->ip_xattr_sem);
3241         if (!value && !ret) {
3242                 ret = ocfs2_try_remove_refcount_tree(inode, di_bh);
3243                 if (ret)
3244                         mlog_errno(ret);
3245         }
3246         ocfs2_inode_unlock(inode, 1);
3247 cleanup_nolock:
3248         brelse(di_bh);
3249         brelse(xbs.xattr_bh);
3250         ocfs2_xattr_bucket_free(xbs.bucket);
3251
3252         return ret;
3253 }
3254
3255 /*
3256  * Find the xattr extent rec which may contains name_hash.
3257  * e_cpos will be the first name hash of the xattr rec.
3258  * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
3259  */
3260 static int ocfs2_xattr_get_rec(struct inode *inode,
3261                                u32 name_hash,
3262                                u64 *p_blkno,
3263                                u32 *e_cpos,
3264                                u32 *num_clusters,
3265                                struct ocfs2_extent_list *el)
3266 {
3267         int ret = 0, i;
3268         struct buffer_head *eb_bh = NULL;
3269         struct ocfs2_extent_block *eb;
3270         struct ocfs2_extent_rec *rec = NULL;
3271         u64 e_blkno = 0;
3272
3273         if (el->l_tree_depth) {
3274                 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
3275                                       &eb_bh);
3276                 if (ret) {
3277                         mlog_errno(ret);
3278                         goto out;
3279                 }
3280
3281                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
3282                 el = &eb->h_list;
3283
3284                 if (el->l_tree_depth) {
3285                         ocfs2_error(inode->i_sb,
3286                                     "Inode %lu has non zero tree depth in "
3287                                     "xattr tree block %llu\n", inode->i_ino,
3288                                     (unsigned long long)eb_bh->b_blocknr);
3289                         ret = -EROFS;
3290                         goto out;
3291                 }
3292         }
3293
3294         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
3295                 rec = &el->l_recs[i];
3296
3297                 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
3298                         e_blkno = le64_to_cpu(rec->e_blkno);
3299                         break;
3300                 }
3301         }
3302
3303         if (!e_blkno) {
3304                 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
3305                             "record (%u, %u, 0) in xattr", inode->i_ino,
3306                             le32_to_cpu(rec->e_cpos),
3307                             ocfs2_rec_clusters(el, rec));
3308                 ret = -EROFS;
3309                 goto out;
3310         }
3311
3312         *p_blkno = le64_to_cpu(rec->e_blkno);
3313         *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
3314         if (e_cpos)
3315                 *e_cpos = le32_to_cpu(rec->e_cpos);
3316 out:
3317         brelse(eb_bh);
3318         return ret;
3319 }
3320
3321 typedef int (xattr_bucket_func)(struct inode *inode,
3322                                 struct ocfs2_xattr_bucket *bucket,
3323                                 void *para);
3324
3325 static int ocfs2_find_xe_in_bucket(struct inode *inode,
3326                                    struct ocfs2_xattr_bucket *bucket,
3327                                    int name_index,
3328                                    const char *name,
3329                                    u32 name_hash,
3330                                    u16 *xe_index,
3331                                    int *found)
3332 {
3333         int i, ret = 0, cmp = 1, block_off, new_offset;
3334         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3335         size_t name_len = strlen(name);
3336         struct ocfs2_xattr_entry *xe = NULL;
3337         char *xe_name;
3338
3339         /*
3340          * We don't use binary search in the bucket because there
3341          * may be multiple entries with the same name hash.
3342          */
3343         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3344                 xe = &xh->xh_entries[i];
3345
3346                 if (name_hash > le32_to_cpu(xe->xe_name_hash))
3347                         continue;
3348                 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
3349                         break;
3350
3351                 cmp = name_index - ocfs2_xattr_get_type(xe);
3352                 if (!cmp)
3353                         cmp = name_len - xe->xe_name_len;
3354                 if (cmp)
3355                         continue;
3356
3357                 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3358                                                         xh,
3359                                                         i,
3360                                                         &block_off,
3361                                                         &new_offset);
3362                 if (ret) {
3363                         mlog_errno(ret);
3364                         break;
3365                 }
3366
3367
3368                 xe_name = bucket_block(bucket, block_off) + new_offset;
3369                 if (!memcmp(name, xe_name, name_len)) {
3370                         *xe_index = i;
3371                         *found = 1;
3372                         ret = 0;
3373                         break;
3374                 }
3375         }
3376
3377         return ret;
3378 }
3379
3380 /*
3381  * Find the specified xattr entry in a series of buckets.
3382  * This series start from p_blkno and last for num_clusters.
3383  * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
3384  * the num of the valid buckets.
3385  *
3386  * Return the buffer_head this xattr should reside in. And if the xattr's
3387  * hash is in the gap of 2 buckets, return the lower bucket.
3388  */
3389 static int ocfs2_xattr_bucket_find(struct inode *inode,
3390                                    int name_index,
3391                                    const char *name,
3392                                    u32 name_hash,
3393                                    u64 p_blkno,
3394                                    u32 first_hash,
3395                                    u32 num_clusters,
3396                                    struct ocfs2_xattr_search *xs)
3397 {
3398         int ret, found = 0;
3399         struct ocfs2_xattr_header *xh = NULL;
3400         struct ocfs2_xattr_entry *xe = NULL;
3401         u16 index = 0;
3402         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3403         int low_bucket = 0, bucket, high_bucket;
3404         struct ocfs2_xattr_bucket *search;
3405         u32 last_hash;
3406         u64 blkno, lower_blkno = 0;
3407
3408         search = ocfs2_xattr_bucket_new(inode);
3409         if (!search) {
3410                 ret = -ENOMEM;
3411                 mlog_errno(ret);
3412                 goto out;
3413         }
3414
3415         ret = ocfs2_read_xattr_bucket(search, p_blkno);
3416         if (ret) {
3417                 mlog_errno(ret);
3418                 goto out;
3419         }
3420
3421         xh = bucket_xh(search);
3422         high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
3423         while (low_bucket <= high_bucket) {
3424                 ocfs2_xattr_bucket_relse(search);
3425
3426                 bucket = (low_bucket + high_bucket) / 2;
3427                 blkno = p_blkno + bucket * blk_per_bucket;
3428                 ret = ocfs2_read_xattr_bucket(search, blkno);
3429                 if (ret) {
3430                         mlog_errno(ret);
3431                         goto out;
3432                 }
3433
3434                 xh = bucket_xh(search);
3435                 xe = &xh->xh_entries[0];
3436                 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
3437                         high_bucket = bucket - 1;
3438                         continue;
3439                 }
3440
3441                 /*
3442                  * Check whether the hash of the last entry in our
3443                  * bucket is larger than the search one. for an empty
3444                  * bucket, the last one is also the first one.
3445                  */
3446                 if (xh->xh_count)
3447                         xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
3448
3449                 last_hash = le32_to_cpu(xe->xe_name_hash);
3450
3451                 /* record lower_blkno which may be the insert place. */
3452                 lower_blkno = blkno;
3453
3454                 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
3455                         low_bucket = bucket + 1;
3456                         continue;
3457                 }
3458
3459                 /* the searched xattr should reside in this bucket if exists. */
3460                 ret = ocfs2_find_xe_in_bucket(inode, search,
3461                                               name_index, name, name_hash,
3462                                               &index, &found);
3463                 if (ret) {
3464                         mlog_errno(ret);
3465                         goto out;
3466                 }
3467                 break;
3468         }
3469
3470         /*
3471          * Record the bucket we have found.
3472          * When the xattr's hash value is in the gap of 2 buckets, we will
3473          * always set it to the previous bucket.
3474          */
3475         if (!lower_blkno)
3476                 lower_blkno = p_blkno;
3477
3478         /* This should be in cache - we just read it during the search */
3479         ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
3480         if (ret) {
3481                 mlog_errno(ret);
3482                 goto out;
3483         }
3484
3485         xs->header = bucket_xh(xs->bucket);
3486         xs->base = bucket_block(xs->bucket, 0);
3487         xs->end = xs->base + inode->i_sb->s_blocksize;
3488
3489         if (found) {
3490                 xs->here = &xs->header->xh_entries[index];
3491                 mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
3492                      (unsigned long long)bucket_blkno(xs->bucket), index);
3493         } else
3494                 ret = -ENODATA;
3495
3496 out:
3497         ocfs2_xattr_bucket_free(search);
3498         return ret;
3499 }
3500
3501 static int ocfs2_xattr_index_block_find(struct inode *inode,
3502                                         struct buffer_head *root_bh,
3503                                         int name_index,
3504                                         const char *name,
3505                                         struct ocfs2_xattr_search *xs)
3506 {
3507         int ret;
3508         struct ocfs2_xattr_block *xb =
3509                         (struct ocfs2_xattr_block *)root_bh->b_data;
3510         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3511         struct ocfs2_extent_list *el = &xb_root->xt_list;
3512         u64 p_blkno = 0;
3513         u32 first_hash, num_clusters = 0;
3514         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
3515
3516         if (le16_to_cpu(el->l_next_free_rec) == 0)
3517                 return -ENODATA;
3518
3519         mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
3520              name, name_hash, name_index);
3521
3522         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3523                                   &num_clusters, el);
3524         if (ret) {
3525                 mlog_errno(ret);
3526                 goto out;
3527         }
3528
3529         BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3530
3531         mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
3532              "in the rec is %u\n", num_clusters, (unsigned long long)p_blkno,
3533              first_hash);
3534
3535         ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3536                                       p_blkno, first_hash, num_clusters, xs);
3537
3538 out:
3539         return ret;
3540 }
3541
3542 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3543                                        u64 blkno,
3544                                        u32 clusters,
3545                                        xattr_bucket_func *func,
3546                                        void *para)
3547 {
3548         int i, ret = 0;
3549         u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3550         u32 num_buckets = clusters * bpc;
3551         struct ocfs2_xattr_bucket *bucket;
3552
3553         bucket = ocfs2_xattr_bucket_new(inode);
3554         if (!bucket) {
3555                 mlog_errno(-ENOMEM);
3556                 return -ENOMEM;
3557         }
3558
3559         mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
3560              clusters, (unsigned long long)blkno);
3561
3562         for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3563                 ret = ocfs2_read_xattr_bucket(bucket, blkno);
3564                 if (ret) {
3565                         mlog_errno(ret);
3566                         break;
3567                 }
3568
3569                 /*
3570                  * The real bucket num in this series of blocks is stored
3571                  * in the 1st bucket.
3572                  */
3573                 if (i == 0)
3574                         num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
3575
3576                 mlog(0, "iterating xattr bucket %llu, first hash %u\n",
3577                      (unsigned long long)blkno,
3578                      le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
3579                 if (func) {
3580                         ret = func(inode, bucket, para);
3581                         if (ret && ret != -ERANGE)
3582                                 mlog_errno(ret);
3583                         /* Fall through to bucket_relse() */
3584                 }
3585
3586                 ocfs2_xattr_bucket_relse(bucket);
3587                 if (ret)
3588                         break;
3589         }
3590
3591         ocfs2_xattr_bucket_free(bucket);
3592         return ret;
3593 }
3594
3595 struct ocfs2_xattr_tree_list {
3596         char *buffer;
3597         size_t buffer_size;
3598         size_t result;
3599 };
3600
3601 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
3602                                              struct ocfs2_xattr_header *xh,
3603                                              int index,
3604                                              int *block_off,
3605                                              int *new_offset)
3606 {
3607         u16 name_offset;
3608
3609         if (index < 0 || index >= le16_to_cpu(xh->xh_count))
3610                 return -EINVAL;
3611
3612         name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
3613
3614         *block_off = name_offset >> sb->s_blocksize_bits;
3615         *new_offset = name_offset % sb->s_blocksize;
3616
3617         return 0;
3618 }
3619
3620 static int ocfs2_list_xattr_bucket(struct inode *inode,
3621                                    struct ocfs2_xattr_bucket *bucket,
3622                                    void *para)
3623 {
3624         int ret = 0, type;
3625         struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
3626         int i, block_off, new_offset;
3627         const char *prefix, *name;
3628
3629         for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
3630                 struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
3631                 type = ocfs2_xattr_get_type(entry);
3632                 prefix = ocfs2_xattr_prefix(type);
3633
3634                 if (prefix) {
3635                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3636                                                                 bucket_xh(bucket),
3637                                                                 i,
3638                                                                 &block_off,
3639                                                                 &new_offset);
3640                         if (ret)
3641                                 break;
3642
3643                         name = (const char *)bucket_block(bucket, block_off) +
3644                                 new_offset;
3645                         ret = ocfs2_xattr_list_entry(xl->buffer,
3646                                                      xl->buffer_size,
3647                                                      &xl->result,
3648                                                      prefix, name,
3649                                                      entry->xe_name_len);
3650                         if (ret)
3651                                 break;
3652                 }
3653         }
3654
3655         return ret;
3656 }
3657
3658 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
3659                                            struct buffer_head *blk_bh,
3660                                            xattr_tree_rec_func *rec_func,
3661                                            void *para)
3662 {
3663         struct ocfs2_xattr_block *xb =
3664                         (struct ocfs2_xattr_block *)blk_bh->b_data;
3665         struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
3666         int ret = 0;
3667         u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
3668         u64 p_blkno = 0;
3669
3670         if (!el->l_next_free_rec || !rec_func)
3671                 return 0;
3672
3673         while (name_hash > 0) {
3674                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
3675                                           &e_cpos, &num_clusters, el);
3676                 if (ret) {
3677                         mlog_errno(ret);
3678                         break;
3679                 }
3680
3681                 ret = rec_func(inode, blk_bh, p_blkno, e_cpos,
3682                                num_clusters, para);
3683                 if (ret) {
3684                         if (ret != -ERANGE)
3685                                 mlog_errno(ret);
3686                         break;
3687                 }
3688
3689                 if (e_cpos == 0)
3690                         break;
3691
3692                 name_hash = e_cpos - 1;
3693         }
3694
3695         return ret;
3696
3697 }
3698
3699 static int ocfs2_list_xattr_tree_rec(struct inode *inode,
3700                                      struct buffer_head *root_bh,
3701                                      u64 blkno, u32 cpos, u32 len, void *para)
3702 {
3703         return ocfs2_iterate_xattr_buckets(inode, blkno, len,
3704                                            ocfs2_list_xattr_bucket, para);
3705 }
3706
3707 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
3708                                              struct buffer_head *blk_bh,
3709                                              char *buffer,
3710                                              size_t buffer_size)
3711 {
3712         int ret;
3713         struct ocfs2_xattr_tree_list xl = {
3714                 .buffer = buffer,
3715                 .buffer_size = buffer_size,
3716                 .result = 0,
3717         };
3718
3719         ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
3720                                               ocfs2_list_xattr_tree_rec, &xl);
3721         if (ret) {
3722                 mlog_errno(ret);
3723                 goto out;
3724         }
3725
3726         ret = xl.result;
3727 out:
3728         return ret;
3729 }
3730
3731 static int cmp_xe(const void *a, const void *b)
3732 {
3733         const struct ocfs2_xattr_entry *l = a, *r = b;
3734         u32 l_hash = le32_to_cpu(l->xe_name_hash);
3735         u32 r_hash = le32_to_cpu(r->xe_name_hash);
3736
3737         if (l_hash > r_hash)
3738                 return 1;
3739         if (l_hash < r_hash)
3740                 return -1;
3741         return 0;
3742 }
3743
3744 static void swap_xe(void *a, void *b, int size)
3745 {
3746         struct ocfs2_xattr_entry *l = a, *r = b, tmp;
3747
3748         tmp = *l;
3749         memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
3750         memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
3751 }
3752
3753 /*
3754  * When the ocfs2_xattr_block is filled up, new bucket will be created
3755  * and all the xattr entries will be moved to the new bucket.
3756  * The header goes at the start of the bucket, and the names+values are
3757  * filled from the end.  This is why *target starts as the last buffer.
3758  * Note: we need to sort the entries since they are not saved in order
3759  * in the ocfs2_xattr_block.
3760  */
3761 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
3762                                            struct buffer_head *xb_bh,
3763                                            struct ocfs2_xattr_bucket *bucket)
3764 {
3765         int i, blocksize = inode->i_sb->s_blocksize;
3766         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3767         u16 offset, size, off_change;
3768         struct ocfs2_xattr_entry *xe;
3769         struct ocfs2_xattr_block *xb =
3770                                 (struct ocfs2_xattr_block *)xb_bh->b_data;
3771         struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
3772         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3773         u16 count = le16_to_cpu(xb_xh->xh_count);
3774         char *src = xb_bh->b_data;
3775         char *target = bucket_block(bucket, blks - 1);
3776
3777         mlog(0, "cp xattr from block %llu to bucket %llu\n",
3778              (unsigned long long)xb_bh->b_blocknr,
3779              (unsigned long long)bucket_blkno(bucket));
3780
3781         for (i = 0; i < blks; i++)
3782                 memset(bucket_block(bucket, i), 0, blocksize);
3783
3784         /*
3785          * Since the xe_name_offset is based on ocfs2_xattr_header,
3786          * there is a offset change corresponding to the change of
3787          * ocfs2_xattr_header's position.
3788          */
3789         off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
3790         xe = &xb_xh->xh_entries[count - 1];
3791         offset = le16_to_cpu(xe->xe_name_offset) + off_change;
3792         size = blocksize - offset;
3793
3794         /* copy all the names and values. */
3795         memcpy(target + offset, src + offset, size);
3796
3797         /* Init new header now. */
3798         xh->xh_count = xb_xh->xh_count;
3799         xh->xh_num_buckets = cpu_to_le16(1);
3800         xh->xh_name_value_len = cpu_to_le16(size);
3801         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
3802
3803         /* copy all the entries. */
3804         target = bucket_block(bucket, 0);
3805         offset = offsetof(struct ocfs2_xattr_header, xh_entries);
3806         size = count * sizeof(struct ocfs2_xattr_entry);
3807         memcpy(target + offset, (char *)xb_xh + offset, size);
3808
3809         /* Change the xe offset for all the xe because of the move. */
3810         off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
3811                  offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
3812         for (i = 0; i < count; i++)
3813                 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
3814
3815         mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
3816              offset, size, off_change);
3817
3818         sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
3819              cmp_xe, swap_xe);
3820 }
3821
3822 /*
3823  * After we move xattr from block to index btree, we have to
3824  * update ocfs2_xattr_search to the new xe and base.
3825  *
3826  * When the entry is in xattr block, xattr_bh indicates the storage place.
3827  * While if the entry is in index b-tree, "bucket" indicates the
3828  * real place of the xattr.
3829  */
3830 static void ocfs2_xattr_update_xattr_search(struct inode *inode,
3831                                             struct ocfs2_xattr_search *xs,
3832                                             struct buffer_head *old_bh)
3833 {
3834         char *buf = old_bh->b_data;
3835         struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
3836         struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
3837         int i;
3838
3839         xs->header = bucket_xh(xs->bucket);
3840         xs->base = bucket_block(xs->bucket, 0);
3841         xs->end = xs->base + inode->i_sb->s_blocksize;
3842
3843         if (xs->not_found)
3844                 return;
3845
3846         i = xs->here - old_xh->xh_entries;
3847         xs->here = &xs->header->xh_entries[i];
3848 }
3849
3850 static int ocfs2_xattr_create_index_block(struct inode *inode,
3851                                           struct ocfs2_xattr_search *xs,
3852                                           struct ocfs2_xattr_set_ctxt *ctxt)
3853 {
3854         int ret;
3855         u32 bit_off, len;
3856         u64 blkno;
3857         handle_t *handle = ctxt->handle;
3858         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3859         struct ocfs2_inode_info *oi = OCFS2_I(inode);
3860         struct buffer_head *xb_bh = xs->xattr_bh;
3861         struct ocfs2_xattr_block *xb =
3862                         (struct ocfs2_xattr_block *)xb_bh->b_data;
3863         struct ocfs2_xattr_tree_root *xr;
3864         u16 xb_flags = le16_to_cpu(xb->xb_flags);
3865
3866         mlog(0, "create xattr index block for %llu\n",
3867              (unsigned long long)xb_bh->b_blocknr);
3868
3869         BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
3870         BUG_ON(!xs->bucket);
3871
3872         /*
3873          * XXX:
3874          * We can use this lock for now, and maybe move to a dedicated mutex
3875          * if performance becomes a problem later.
3876          */
3877         down_write(&oi->ip_alloc_sem);
3878
3879         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), xb_bh,
3880                                       OCFS2_JOURNAL_ACCESS_WRITE);
3881         if (ret) {
3882                 mlog_errno(ret);
3883                 goto out;
3884         }
3885
3886         ret = __ocfs2_claim_clusters(osb, handle, ctxt->data_ac,
3887                                      1, 1, &bit_off, &len);
3888         if (ret) {
3889                 mlog_errno(ret);
3890                 goto out;
3891         }
3892
3893         /*
3894          * The bucket may spread in many blocks, and
3895          * we will only touch the 1st block and the last block
3896          * in the whole bucket(one for entry and one for data).
3897          */
3898         blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
3899
3900         mlog(0, "allocate 1 cluster from %llu to xattr block\n",
3901              (unsigned long long)blkno);
3902
3903         ret = ocfs2_init_xattr_bucket(xs->bucket, blkno);
3904         if (ret) {
3905                 mlog_errno(ret);
3906                 goto out;
3907         }
3908
3909         ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
3910                                                 OCFS2_JOURNAL_ACCESS_CREATE);
3911         if (ret) {
3912                 mlog_errno(ret);
3913                 goto out;
3914         }
3915
3916         ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
3917         ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
3918
3919         ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
3920
3921         /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
3922         memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
3923                offsetof(struct ocfs2_xattr_block, xb_attrs));
3924
3925         xr = &xb->xb_attrs.xb_root;
3926         xr->xt_clusters = cpu_to_le32(1);
3927         xr->xt_last_eb_blk = 0;
3928         xr->xt_list.l_tree_depth = 0;
3929         xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
3930         xr->xt_list.l_next_free_rec = cpu_to_le16(1);
3931
3932         xr->xt_list.l_recs[0].e_cpos = 0;
3933         xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
3934         xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
3935
3936         xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
3937
3938         ocfs2_journal_dirty(handle, xb_bh);
3939
3940 out:
3941         up_write(&oi->ip_alloc_sem);
3942
3943         return ret;
3944 }
3945
3946 static int cmp_xe_offset(const void *a, const void *b)
3947 {
3948         const struct ocfs2_xattr_entry *l = a, *r = b;
3949         u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
3950         u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
3951
3952         if (l_name_offset < r_name_offset)
3953                 return 1;
3954         if (l_name_offset > r_name_offset)
3955                 return -1;
3956         return 0;
3957 }
3958
3959 /*
3960  * defrag a xattr bucket if we find that the bucket has some
3961  * holes beteen name/value pairs.
3962  * We will move all the name/value pairs to the end of the bucket
3963  * so that we can spare some space for insertion.
3964  */
3965 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
3966                                      handle_t *handle,
3967                                      struct ocfs2_xattr_bucket *bucket)
3968 {
3969         int ret, i;
3970         size_t end, offset, len, value_len;
3971         struct ocfs2_xattr_header *xh;
3972         char *entries, *buf, *bucket_buf = NULL;
3973         u64 blkno = bucket_blkno(bucket);
3974         u16 xh_free_start;
3975         size_t blocksize = inode->i_sb->s_blocksize;
3976         struct ocfs2_xattr_entry *xe;
3977
3978         /*
3979          * In order to make the operation more efficient and generic,
3980          * we copy all the blocks into a contiguous memory and do the
3981          * defragment there, so if anything is error, we will not touch
3982          * the real block.
3983          */
3984         bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
3985         if (!bucket_buf) {
3986                 ret = -EIO;
3987                 goto out;
3988         }
3989
3990         buf = bucket_buf;
3991         for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
3992                 memcpy(buf, bucket_block(bucket, i), blocksize);
3993
3994         ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
3995                                                 OCFS2_JOURNAL_ACCESS_WRITE);
3996         if (ret < 0) {
3997                 mlog_errno(ret);
3998                 goto out;
3999         }
4000
4001         xh = (struct ocfs2_xattr_header *)bucket_buf;
4002         entries = (char *)xh->xh_entries;
4003         xh_free_start = le16_to_cpu(xh->xh_free_start);
4004
4005         mlog(0, "adjust xattr bucket in %llu, count = %u, "
4006              "xh_free_start = %u, xh_name_value_len = %u.\n",
4007              (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
4008              xh_free_start, le16_to_cpu(xh->xh_name_value_len));
4009
4010         /*
4011          * sort all the entries by their offset.
4012          * the largest will be the first, so that we can
4013          * move them to the end one by one.
4014          */
4015         sort(entries, le16_to_cpu(xh->xh_count),
4016              sizeof(struct ocfs2_xattr_entry),
4017              cmp_xe_offset, swap_xe);
4018
4019         /* Move all name/values to the end of the bucket. */
4020         xe = xh->xh_entries;
4021         end = OCFS2_XATTR_BUCKET_SIZE;
4022         for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
4023                 offset = le16_to_cpu(xe->xe_name_offset);
4024                 if (ocfs2_xattr_is_local(xe))
4025                         value_len = OCFS2_XATTR_SIZE(
4026                                         le64_to_cpu(xe->xe_value_size));
4027                 else
4028                         value_len = OCFS2_XATTR_ROOT_SIZE;
4029                 len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
4030
4031                 /*
4032                  * We must make sure that the name/value pair
4033                  * exist in the same block. So adjust end to
4034                  * the previous block end if needed.
4035                  */
4036                 if (((end - len) / blocksize !=
4037                         (end - 1) / blocksize))
4038                         end = end - end % blocksize;
4039
4040                 if (end > offset + len) {
4041                         memmove(bucket_buf + end - len,
4042                                 bucket_buf + offset, len);
4043                         xe->xe_name_offset = cpu_to_le16(end - len);
4044                 }
4045
4046                 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
4047                                 "bucket %llu\n", (unsigned long long)blkno);
4048
4049                 end -= len;
4050         }
4051
4052         mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
4053                         "bucket %llu\n", (unsigned long long)blkno);
4054
4055         if (xh_free_start == end)
4056                 goto out;
4057
4058         memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
4059         xh->xh_free_start = cpu_to_le16(end);
4060
4061         /* sort the entries by their name_hash. */
4062         sort(entries, le16_to_cpu(xh->xh_count),
4063              sizeof(struct ocfs2_xattr_entry),
4064              cmp_xe, swap_xe);
4065
4066         buf = bucket_buf;
4067         for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4068                 memcpy(bucket_block(bucket, i), buf, blocksize);
4069         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
4070
4071 out:
4072         kfree(bucket_buf);
4073         return ret;
4074 }
4075
4076 /*
4077  * prev_blkno points to the start of an existing extent.  new_blkno
4078  * points to a newly allocated extent.  Because we know each of our
4079  * clusters contains more than bucket, we can easily split one cluster
4080  * at a bucket boundary.  So we take the last cluster of the existing
4081  * extent and split it down the middle.  We move the last half of the
4082  * buckets in the last cluster of the existing extent over to the new
4083  * extent.
4084  *
4085  * first_bh is the buffer at prev_blkno so we can update the existing
4086  * extent's bucket count.  header_bh is the bucket were we were hoping
4087  * to insert our xattr.  If the bucket move places the target in the new
4088  * extent, we'll update first_bh and header_bh after modifying the old
4089  * extent.
4090  *
4091  * first_hash will be set as the 1st xe's name_hash in the new extent.
4092  */
4093 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
4094                                                handle_t *handle,
4095                                                struct ocfs2_xattr_bucket *first,
4096                                                struct ocfs2_xattr_bucket *target,
4097                                                u64 new_blkno,
4098                                                u32 num_clusters,
4099                                                u32 *first_hash)
4100 {
4101         int ret;
4102         struct super_block *sb = inode->i_sb;
4103         int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(sb);
4104         int num_buckets = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
4105         int to_move = num_buckets / 2;
4106         u64 src_blkno;
4107         u64 last_cluster_blkno = bucket_blkno(first) +
4108                 ((num_clusters - 1) * ocfs2_clusters_to_blocks(sb, 1));
4109
4110         BUG_ON(le16_to_cpu(bucket_xh(first)->xh_num_buckets) < num_buckets);
4111         BUG_ON(OCFS2_XATTR_BUCKET_SIZE == OCFS2_SB(sb)->s_clustersize);
4112
4113         mlog(0, "move half of xattrs in cluster %llu to %llu\n",
4114              (unsigned long long)last_cluster_blkno, (unsigned long long)new_blkno);
4115
4116         ret = ocfs2_mv_xattr_buckets(inode, handle, bucket_blkno(first),
4117                                      last_cluster_blkno, new_blkno,
4118                                      to_move, first_hash);
4119         if (ret) {
4120                 mlog_errno(ret);
4121                 goto out;
4122         }
4123
4124         /* This is the first bucket that got moved */
4125         src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
4126
4127         /*
4128          * If the target bucket was part of the moved buckets, we need to
4129          * update first and target.
4130          */
4131         if (bucket_blkno(target) >= src_blkno) {
4132                 /* Find the block for the new target bucket */
4133                 src_blkno = new_blkno +
4134                         (bucket_blkno(target) - src_blkno);
4135
4136                 ocfs2_xattr_bucket_relse(first);
4137                 ocfs2_xattr_bucket_relse(target);
4138
4139                 /*
4140                  * These shouldn't fail - the buffers are in the
4141                  * journal from ocfs2_cp_xattr_bucket().
4142                  */
4143                 ret = ocfs2_read_xattr_bucket(first, new_blkno);
4144                 if (ret) {
4145                         mlog_errno(ret);
4146                         goto out;
4147                 }
4148                 ret = ocfs2_read_xattr_bucket(target, src_blkno);
4149                 if (ret)
4150                         mlog_errno(ret);
4151
4152         }
4153
4154 out:
4155         return ret;
4156 }
4157
4158 /*
4159  * Find the suitable pos when we divide a bucket into 2.
4160  * We have to make sure the xattrs with the same hash value exist
4161  * in the same bucket.
4162  *
4163  * If this ocfs2_xattr_header covers more than one hash value, find a
4164  * place where the hash value changes.  Try to find the most even split.
4165  * The most common case is that all entries have different hash values,
4166  * and the first check we make will find a place to split.
4167  */
4168 static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
4169 {
4170         struct ocfs2_xattr_entry *entries = xh->xh_entries;
4171         int count = le16_to_cpu(xh->xh_count);
4172         int delta, middle = count / 2;
4173
4174         /*
4175          * We start at the middle.  Each step gets farther away in both
4176          * directions.  We therefore hit the change in hash value
4177          * nearest to the middle.  Note that this loop does not execute for
4178          * count < 2.
4179          */
4180         for (delta = 0; delta < middle; delta++) {
4181                 /* Let's check delta earlier than middle */
4182                 if (cmp_xe(&entries[middle - delta - 1],
4183                            &entries[middle - delta]))
4184                         return middle - delta;
4185
4186                 /* For even counts, don't walk off the end */
4187                 if ((middle + delta + 1) == count)
4188                         continue;
4189
4190                 /* Now try delta past middle */
4191                 if (cmp_xe(&entries[middle + delta],
4192                            &entries[middle + delta + 1]))
4193                         return middle + delta + 1;
4194         }
4195
4196         /* Every entry had the same hash */
4197         return count;
4198 }
4199
4200 /*
4201  * Move some xattrs in old bucket(blk) to new bucket(new_blk).
4202  * first_hash will record the 1st hash of the new bucket.
4203  *
4204  * Normally half of the xattrs will be moved.  But we have to make
4205  * sure that the xattrs with the same hash value are stored in the
4206  * same bucket. If all the xattrs in this bucket have the same hash
4207  * value, the new bucket will be initialized as an empty one and the
4208  * first_hash will be initialized as (hash_value+1).
4209  */
4210 static int ocfs2_divide_xattr_bucket(struct inode *inode,
4211                                     handle_t *handle,
4212                                     u64 blk,
4213                                     u64 new_blk,
4214                                     u32 *first_hash,
4215                                     int new_bucket_head)
4216 {
4217         int ret, i;
4218         int count, start, len, name_value_len = 0, xe_len, name_offset = 0;
4219         struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4220         struct ocfs2_xattr_header *xh;
4221         struct ocfs2_xattr_entry *xe;
4222         int blocksize = inode->i_sb->s_blocksize;
4223
4224         mlog(0, "move some of xattrs from bucket %llu to %llu\n",
4225              (unsigned long long)blk, (unsigned long long)new_blk);
4226
4227         s_bucket = ocfs2_xattr_bucket_new(inode);
4228         t_bucket = ocfs2_xattr_bucket_new(inode);
4229         if (!s_bucket || !t_bucket) {
4230                 ret = -ENOMEM;
4231                 mlog_errno(ret);
4232                 goto out;
4233         }
4234
4235         ret = ocfs2_read_xattr_bucket(s_bucket, blk);
4236         if (ret) {
4237                 mlog_errno(ret);
4238                 goto out;
4239         }
4240
4241         ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
4242                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4243         if (ret) {
4244                 mlog_errno(ret);
4245                 goto out;
4246         }
4247
4248         /*
4249          * Even if !new_bucket_head, we're overwriting t_bucket.  Thus,
4250          * there's no need to read it.
4251          */
4252         ret = ocfs2_init_xattr_bucket(t_bucket, new_blk);
4253         if (ret) {
4254                 mlog_errno(ret);
4255                 goto out;
4256         }
4257
4258         /*
4259          * Hey, if we're overwriting t_bucket, what difference does
4260          * ACCESS_CREATE vs ACCESS_WRITE make?  See the comment in the
4261          * same part of ocfs2_cp_xattr_bucket().
4262          */
4263         ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4264                                                 new_bucket_head ?
4265                                                 OCFS2_JOURNAL_ACCESS_CREATE :
4266                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4267         if (ret) {
4268                 mlog_errno(ret);
4269                 goto out;
4270         }
4271
4272         xh = bucket_xh(s_bucket);
4273         count = le16_to_cpu(xh->xh_count);
4274         start = ocfs2_xattr_find_divide_pos(xh);
4275
4276         if (start == count) {
4277                 xe = &xh->xh_entries[start-1];
4278
4279                 /*
4280                  * initialized a new empty bucket here.
4281                  * The hash value is set as one larger than
4282                  * that of the last entry in the previous bucket.
4283                  */
4284                 for (i = 0; i < t_bucket->bu_blocks; i++)
4285                         memset(bucket_block(t_bucket, i), 0, blocksize);
4286
4287                 xh = bucket_xh(t_bucket);
4288                 xh->xh_free_start = cpu_to_le16(blocksize);
4289                 xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
4290                 le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
4291
4292                 goto set_num_buckets;
4293         }
4294
4295         /* copy the whole bucket to the new first. */
4296         ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4297
4298         /* update the new bucket. */
4299         xh = bucket_xh(t_bucket);
4300
4301         /*
4302          * Calculate the total name/value len and xh_free_start for
4303          * the old bucket first.
4304          */
4305         name_offset = OCFS2_XATTR_BUCKET_SIZE;
4306         name_value_len = 0;
4307         for (i = 0; i < start; i++) {
4308                 xe = &xh->xh_entries[i];
4309                 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
4310                 if (ocfs2_xattr_is_local(xe))
4311                         xe_len +=
4312                            OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4313                 else
4314                         xe_len += OCFS2_XATTR_ROOT_SIZE;
4315                 name_value_len += xe_len;
4316                 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
4317                         name_offset = le16_to_cpu(xe->xe_name_offset);
4318         }
4319
4320         /*
4321          * Now begin the modification to the new bucket.
4322          *
4323          * In the new bucket, We just move the xattr entry to the beginning
4324          * and don't touch the name/value. So there will be some holes in the
4325          * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
4326          * called.
4327          */
4328         xe = &xh->xh_entries[start];
4329         len = sizeof(struct ocfs2_xattr_entry) * (count - start);
4330         mlog(0, "mv xattr entry len %d from %d to %d\n", len,
4331              (int)((char *)xe - (char *)xh),
4332              (int)((char *)xh->xh_entries - (char *)xh));
4333         memmove((char *)xh->xh_entries, (char *)xe, len);
4334         xe = &xh->xh_entries[count - start];
4335         len = sizeof(struct ocfs2_xattr_entry) * start;
4336         memset((char *)xe, 0, len);
4337
4338         le16_add_cpu(&xh->xh_count, -start);
4339         le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
4340
4341         /* Calculate xh_free_start for the new bucket. */
4342         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4343         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4344                 xe = &xh->xh_entries[i];
4345                 xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
4346                 if (ocfs2_xattr_is_local(xe))
4347                         xe_len +=
4348                            OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4349                 else
4350                         xe_len += OCFS2_XATTR_ROOT_SIZE;
4351                 if (le16_to_cpu(xe->xe_name_offset) <
4352                     le16_to_cpu(xh->xh_free_start))
4353                         xh->xh_free_start = xe->xe_name_offset;
4354         }
4355
4356 set_num_buckets:
4357         /* set xh->xh_num_buckets for the new xh. */
4358         if (new_bucket_head)
4359                 xh->xh_num_buckets = cpu_to_le16(1);
4360         else
4361                 xh->xh_num_buckets = 0;
4362
4363         ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4364
4365         /* store the first_hash of the new bucket. */
4366         if (first_hash)
4367                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
4368
4369         /*
4370          * Now only update the 1st block of the old bucket.  If we
4371          * just added a new empty bucket, there is no need to modify
4372          * it.
4373          */
4374         if (start == count)
4375                 goto out;
4376
4377         xh = bucket_xh(s_bucket);
4378         memset(&xh->xh_entries[start], 0,
4379                sizeof(struct ocfs2_xattr_entry) * (count - start));
4380         xh->xh_count = cpu_to_le16(start);
4381         xh->xh_free_start = cpu_to_le16(name_offset);
4382         xh->xh_name_value_len = cpu_to_le16(name_value_len);
4383
4384         ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
4385
4386 out:
4387         ocfs2_xattr_bucket_free(s_bucket);
4388         ocfs2_xattr_bucket_free(t_bucket);
4389
4390         return ret;
4391 }
4392
4393 /*
4394  * Copy xattr from one bucket to another bucket.
4395  *
4396  * The caller must make sure that the journal transaction
4397  * has enough space for journaling.
4398  */
4399 static int ocfs2_cp_xattr_bucket(struct inode *inode,
4400                                  handle_t *handle,
4401                                  u64 s_blkno,
4402                                  u64 t_blkno,
4403                                  int t_is_new)
4404 {
4405         int ret;
4406         struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4407
4408         BUG_ON(s_blkno == t_blkno);
4409
4410         mlog(0, "cp bucket %llu to %llu, target is %d\n",
4411              (unsigned long long)s_blkno, (unsigned long long)t_blkno,
4412              t_is_new);
4413
4414         s_bucket = ocfs2_xattr_bucket_new(inode);
4415         t_bucket = ocfs2_xattr_bucket_new(inode);
4416         if (!s_bucket || !t_bucket) {
4417                 ret = -ENOMEM;
4418                 mlog_errno(ret);
4419                 goto out;
4420         }
4421
4422         ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
4423         if (ret)
4424                 goto out;
4425
4426         /*
4427          * Even if !t_is_new, we're overwriting t_bucket.  Thus,
4428          * there's no need to read it.
4429          */
4430         ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno);
4431         if (ret)
4432                 goto out;
4433
4434         /*
4435          * Hey, if we're overwriting t_bucket, what difference does
4436          * ACCESS_CREATE vs ACCESS_WRITE make?  Well, if we allocated a new
4437          * cluster to fill, we came here from
4438          * ocfs2_mv_xattr_buckets(), and it is really new -
4439          * ACCESS_CREATE is required.  But we also might have moved data
4440          * out of t_bucket before extending back into it.
4441          * ocfs2_add_new_xattr_bucket() can do this - its call to
4442          * ocfs2_add_new_xattr_cluster() may have created a new extent
4443          * and copied out the end of the old extent.  Then it re-extends
4444          * the old extent back to create space for new xattrs.  That's
4445          * how we get here, and the bucket isn't really new.
4446          */
4447         ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4448                                                 t_is_new ?
4449                                                 OCFS2_JOURNAL_ACCESS_CREATE :
4450                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4451         if (ret)
4452                 goto out;
4453
4454         ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4455         ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4456
4457 out:
4458         ocfs2_xattr_bucket_free(t_bucket);
4459         ocfs2_xattr_bucket_free(s_bucket);
4460
4461         return ret;
4462 }
4463
4464 /*
4465  * src_blk points to the start of an existing extent.  last_blk points to
4466  * last cluster in that extent.  to_blk points to a newly allocated
4467  * extent.  We copy the buckets from the cluster at last_blk to the new
4468  * extent.  If start_bucket is non-zero, we skip that many buckets before
4469  * we start copying.  The new extent's xh_num_buckets gets set to the
4470  * number of buckets we copied.  The old extent's xh_num_buckets shrinks
4471  * by the same amount.
4472  */
4473 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
4474                                   u64 src_blk, u64 last_blk, u64 to_blk,
4475                                   unsigned int start_bucket,
4476                                   u32 *first_hash)
4477 {
4478         int i, ret, credits;
4479         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4480         int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4481         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
4482         struct ocfs2_xattr_bucket *old_first, *new_first;
4483
4484         mlog(0, "mv xattrs from cluster %llu to %llu\n",
4485              (unsigned long long)last_blk, (unsigned long long)to_blk);
4486
4487         BUG_ON(start_bucket >= num_buckets);
4488         if (start_bucket) {
4489                 num_buckets -= start_bucket;
4490                 last_blk += (start_bucket * blks_per_bucket);
4491         }
4492
4493         /* The first bucket of the original extent */
4494         old_first = ocfs2_xattr_bucket_new(inode);
4495         /* The first bucket of the new extent */
4496         new_first = ocfs2_xattr_bucket_new(inode);
4497         if (!old_first || !new_first) {
4498                 ret = -ENOMEM;
4499                 mlog_errno(ret);
4500                 goto out;
4501         }
4502
4503         ret = ocfs2_read_xattr_bucket(old_first, src_blk);
4504         if (ret) {
4505                 mlog_errno(ret);
4506                 goto out;
4507         }
4508
4509         /*
4510          * We need to update the first bucket of the old extent and all
4511          * the buckets going to the new extent.
4512          */
4513         credits = ((num_buckets + 1) * blks_per_bucket) +
4514                 handle->h_buffer_credits;
4515         ret = ocfs2_extend_trans(handle, credits);
4516         if (ret) {
4517                 mlog_errno(ret);
4518                 goto out;
4519         }
4520
4521         ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4522                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4523         if (ret) {
4524                 mlog_errno(ret);
4525                 goto out;
4526         }
4527
4528         for (i = 0; i < num_buckets; i++) {
4529                 ret = ocfs2_cp_xattr_bucket(inode, handle,
4530                                             last_blk + (i * blks_per_bucket),
4531                                             to_blk + (i * blks_per_bucket),
4532                                             1);
4533                 if (ret) {
4534                         mlog_errno(ret);
4535                         goto out;
4536                 }
4537         }
4538
4539         /*
4540          * Get the new bucket ready before we dirty anything
4541          * (This actually shouldn't fail, because we already dirtied
4542          * it once in ocfs2_cp_xattr_bucket()).
4543          */
4544         ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4545         if (ret) {
4546                 mlog_errno(ret);
4547                 goto out;
4548         }
4549         ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4550                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4551         if (ret) {
4552                 mlog_errno(ret);
4553                 goto out;
4554         }
4555
4556         /* Now update the headers */
4557         le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4558         ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4559
4560         bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4561         ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4562
4563         if (first_hash)
4564                 *first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4565
4566 out:
4567         ocfs2_xattr_bucket_free(new_first);
4568         ocfs2_xattr_bucket_free(old_first);
4569         return ret;
4570 }
4571
4572 /*
4573  * Move some xattrs in this cluster to the new cluster.
4574  * This function should only be called when bucket size == cluster size.
4575  * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4576  */
4577 static int ocfs2_divide_xattr_cluster(struct inode *inode,
4578                                       handle_t *handle,
4579                                       u64 prev_blk,
4580                                       u64 new_blk,
4581                                       u32 *first_hash)
4582 {
4583         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4584         int ret, credits = 2 * blk_per_bucket + handle->h_buffer_credits;
4585
4586         BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4587
4588         ret = ocfs2_extend_trans(handle, credits);
4589         if (ret) {
4590                 mlog_errno(ret);
4591                 return ret;
4592         }
4593
4594         /* Move half of the xattr in start_blk to the next bucket. */
4595         return  ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
4596                                           new_blk, first_hash, 1);
4597 }
4598
4599 /*
4600  * Move some xattrs from the old cluster to the new one since they are not
4601  * contiguous in ocfs2 xattr tree.
4602  *
4603  * new_blk starts a new separate cluster, and we will move some xattrs from
4604  * prev_blk to it. v_start will be set as the first name hash value in this
4605  * new cluster so that it can be used as e_cpos during tree insertion and
4606  * don't collide with our original b-tree operations. first_bh and header_bh
4607  * will also be updated since they will be used in ocfs2_extend_xattr_bucket
4608  * to extend the insert bucket.
4609  *
4610  * The problem is how much xattr should we move to the new one and when should
4611  * we update first_bh and header_bh?
4612  * 1. If cluster size > bucket size, that means the previous cluster has more
4613  *    than 1 bucket, so just move half nums of bucket into the new cluster and
4614  *    update the first_bh and header_bh if the insert bucket has been moved
4615  *    to the new cluster.
4616  * 2. If cluster_size == bucket_size:
4617  *    a) If the previous extent rec has more than one cluster and the insert
4618  *       place isn't in the last cluster, copy the entire last cluster to the
4619  *       new one. This time, we don't need to upate the first_bh and header_bh
4620  *       since they will not be moved into the new cluster.
4621  *    b) Otherwise, move the bottom half of the xattrs in the last cluster into
4622  *       the new one. And we set the extend flag to zero if the insert place is
4623  *       moved into the new allocated cluster since no extend is needed.
4624  */
4625 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
4626                                             handle_t *handle,
4627                                             struct ocfs2_xattr_bucket *first,
4628                                             struct ocfs2_xattr_bucket *target,
4629                                             u64 new_blk,
4630                                             u32 prev_clusters,
4631                                             u32 *v_start,
4632                                             int *extend)
4633 {
4634         int ret;
4635
4636         mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
4637              (unsigned long long)bucket_blkno(first), prev_clusters,
4638              (unsigned long long)new_blk);
4639
4640         if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) {
4641                 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
4642                                                           handle,
4643                                                           first, target,
4644                                                           new_blk,
4645                                                           prev_clusters,
4646                                                           v_start);
4647                 if (ret)
4648                         mlog_errno(ret);
4649         } else {
4650                 /* The start of the last cluster in the first extent */
4651                 u64 last_blk = bucket_blkno(first) +
4652                         ((prev_clusters - 1) *
4653                          ocfs2_clusters_to_blocks(inode->i_sb, 1));
4654
4655                 if (prev_clusters > 1 && bucket_blkno(target) != last_blk) {
4656                         ret = ocfs2_mv_xattr_buckets(inode, handle,
4657                                                      bucket_blkno(first),
4658                                                      last_blk, new_blk, 0,
4659                                                      v_start);
4660                         if (ret)
4661                                 mlog_errno(ret);
4662                 } else {
4663                         ret = ocfs2_divide_xattr_cluster(inode, handle,
4664                                                          last_blk, new_blk,
4665                                                          v_start);
4666                         if (ret)
4667                                 mlog_errno(ret);
4668
4669                         if ((bucket_blkno(target) == last_blk) && extend)
4670                                 *extend = 0;
4671                 }
4672         }
4673
4674         return ret;
4675 }
4676
4677 /*
4678  * Add a new cluster for xattr storage.
4679  *
4680  * If the new cluster is contiguous with the previous one, it will be
4681  * appended to the same extent record, and num_clusters will be updated.
4682  * If not, we will insert a new extent for it and move some xattrs in
4683  * the last cluster into the new allocated one.
4684  * We also need to limit the maximum size of a btree leaf, otherwise we'll
4685  * lose the benefits of hashing because we'll have to search large leaves.
4686  * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
4687  * if it's bigger).
4688  *
4689  * first_bh is the first block of the previous extent rec and header_bh
4690  * indicates the bucket we will insert the new xattrs. They will be updated
4691  * when the header_bh is moved into the new cluster.
4692  */
4693 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
4694                                        struct buffer_head *root_bh,
4695                                        struct ocfs2_xattr_bucket *first,
4696                                        struct ocfs2_xattr_bucket *target,
4697                                        u32 *num_clusters,
4698                                        u32 prev_cpos,
4699                                        int *extend,
4700                                        struct ocfs2_xattr_set_ctxt *ctxt)
4701 {
4702         int ret;
4703         u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
4704         u32 prev_clusters = *num_clusters;
4705         u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
4706         u64 block;
4707         handle_t *handle = ctxt->handle;
4708         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4709         struct ocfs2_extent_tree et;
4710
4711         mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
4712              "previous xattr blkno = %llu\n",
4713              (unsigned long long)OCFS2_I(inode)->ip_blkno,
4714              prev_cpos, (unsigned long long)bucket_blkno(first));
4715
4716         ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
4717
4718         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
4719                                       OCFS2_JOURNAL_ACCESS_WRITE);
4720         if (ret < 0) {
4721                 mlog_errno(ret);
4722                 goto leave;
4723         }
4724
4725         ret = __ocfs2_claim_clusters(osb, handle, ctxt->data_ac, 1,
4726                                      clusters_to_add, &bit_off, &num_bits);
4727         if (ret < 0) {
4728                 if (ret != -ENOSPC)
4729                         mlog_errno(ret);
4730                 goto leave;
4731         }
4732
4733         BUG_ON(num_bits > clusters_to_add);
4734
4735         block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
4736         mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
4737              num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
4738
4739         if (bucket_blkno(first) + (prev_clusters * bpc) == block &&
4740             (prev_clusters + num_bits) << osb->s_clustersize_bits <=
4741              OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
4742                 /*
4743                  * If this cluster is contiguous with the old one and
4744                  * adding this new cluster, we don't surpass the limit of
4745                  * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
4746                  * initialized and used like other buckets in the previous
4747                  * cluster.
4748                  * So add it as a contiguous one. The caller will handle
4749                  * its init process.
4750                  */
4751                 v_start = prev_cpos + prev_clusters;
4752                 *num_clusters = prev_clusters + num_bits;
4753                 mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
4754                      num_bits);
4755         } else {
4756                 ret = ocfs2_adjust_xattr_cross_cluster(inode,
4757                                                        handle,
4758                                                        first,
4759                                                        target,
4760                                                        block,
4761                                                        prev_clusters,
4762                                                        &v_start,
4763                                                        extend);
4764                 if (ret) {
4765                         mlog_errno(ret);
4766                         goto leave;
4767                 }
4768         }
4769
4770         mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
4771              num_bits, (unsigned long long)block, v_start);
4772         ret = ocfs2_insert_extent(handle, &et, v_start, block,
4773                                   num_bits, 0, ctxt->meta_ac);
4774         if (ret < 0) {
4775                 mlog_errno(ret);
4776                 goto leave;
4777         }
4778
4779         ret = ocfs2_journal_dirty(handle, root_bh);
4780         if (ret < 0)
4781                 mlog_errno(ret);
4782
4783 leave:
4784         return ret;
4785 }
4786
4787 /*
4788  * We are given an extent.  'first' is the bucket at the very front of
4789  * the extent.  The extent has space for an additional bucket past
4790  * bucket_xh(first)->xh_num_buckets.  'target_blkno' is the block number
4791  * of the target bucket.  We wish to shift every bucket past the target
4792  * down one, filling in that additional space.  When we get back to the
4793  * target, we split the target between itself and the now-empty bucket
4794  * at target+1 (aka, target_blkno + blks_per_bucket).
4795  */
4796 static int ocfs2_extend_xattr_bucket(struct inode *inode,
4797                                      handle_t *handle,
4798                                      struct ocfs2_xattr_bucket *first,
4799                                      u64 target_blk,
4800                                      u32 num_clusters)
4801 {
4802         int ret, credits;
4803         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4804         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4805         u64 end_blk;
4806         u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
4807
4808         mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
4809              "from %llu, len = %u\n", (unsigned long long)target_blk,
4810              (unsigned long long)bucket_blkno(first), num_clusters);
4811
4812         /* The extent must have room for an additional bucket */
4813         BUG_ON(new_bucket >=
4814                (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
4815
4816         /* end_blk points to the last existing bucket */
4817         end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
4818
4819         /*
4820          * end_blk is the start of the last existing bucket.
4821          * Thus, (end_blk - target_blk) covers the target bucket and
4822          * every bucket after it up to, but not including, the last
4823          * existing bucket.  Then we add the last existing bucket, the
4824          * new bucket, and the first bucket (3 * blk_per_bucket).
4825          */
4826         credits = (end_blk - target_blk) + (3 * blk_per_bucket) +
4827                   handle->h_buffer_credits;
4828         ret = ocfs2_extend_trans(handle, credits);
4829         if (ret) {
4830                 mlog_errno(ret);
4831                 goto out;
4832         }
4833
4834         ret = ocfs2_xattr_bucket_journal_access(handle, first,
4835                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4836         if (ret) {
4837                 mlog_errno(ret);
4838                 goto out;
4839         }
4840
4841         while (end_blk != target_blk) {
4842                 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
4843                                             end_blk + blk_per_bucket, 0);
4844                 if (ret)
4845                         goto out;
4846                 end_blk -= blk_per_bucket;
4847         }
4848
4849         /* Move half of the xattr in target_blkno to the next bucket. */
4850         ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
4851                                         target_blk + blk_per_bucket, NULL, 0);
4852
4853         le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
4854         ocfs2_xattr_bucket_journal_dirty(handle, first);
4855
4856 out:
4857         return ret;
4858 }
4859
4860 /*
4861  * Add new xattr bucket in an extent record and adjust the buckets
4862  * accordingly.  xb_bh is the ocfs2_xattr_block, and target is the
4863  * bucket we want to insert into.
4864  *
4865  * In the easy case, we will move all the buckets after target down by
4866  * one. Half of target's xattrs will be moved to the next bucket.
4867  *
4868  * If current cluster is full, we'll allocate a new one.  This may not
4869  * be contiguous.  The underlying calls will make sure that there is
4870  * space for the insert, shifting buckets around if necessary.
4871  * 'target' may be moved by those calls.
4872  */
4873 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
4874                                       struct buffer_head *xb_bh,
4875                                       struct ocfs2_xattr_bucket *target,
4876                                       struct ocfs2_xattr_set_ctxt *ctxt)
4877 {
4878         struct ocfs2_xattr_block *xb =
4879                         (struct ocfs2_xattr_block *)xb_bh->b_data;
4880         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
4881         struct ocfs2_extent_list *el = &xb_root->xt_list;
4882         u32 name_hash =
4883                 le32_to_cpu(bucket_xh(target)->xh_entries[0].xe_name_hash);
4884         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4885         int ret, num_buckets, extend = 1;
4886         u64 p_blkno;
4887         u32 e_cpos, num_clusters;
4888         /* The bucket at the front of the extent */
4889         struct ocfs2_xattr_bucket *first;
4890
4891         mlog(0, "Add new xattr bucket starting from %llu\n",
4892              (unsigned long long)bucket_blkno(target));
4893
4894         /* The first bucket of the original extent */
4895         first = ocfs2_xattr_bucket_new(inode);
4896         if (!first) {
4897                 ret = -ENOMEM;
4898                 mlog_errno(ret);
4899                 goto out;
4900         }
4901
4902         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
4903                                   &num_clusters, el);
4904         if (ret) {
4905                 mlog_errno(ret);
4906                 goto out;
4907         }
4908
4909         ret = ocfs2_read_xattr_bucket(first, p_blkno);
4910         if (ret) {
4911                 mlog_errno(ret);
4912                 goto out;
4913         }
4914
4915         num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
4916         if (num_buckets == le16_to_cpu(bucket_xh(first)->xh_num_buckets)) {
4917                 /*
4918                  * This can move first+target if the target bucket moves
4919                  * to the new extent.
4920                  */
4921                 ret = ocfs2_add_new_xattr_cluster(inode,
4922                                                   xb_bh,
4923                                                   first,
4924                                                   target,
4925                                                   &num_clusters,
4926                                                   e_cpos,
4927                                                   &extend,
4928                                                   ctxt);
4929                 if (ret) {
4930                         mlog_errno(ret);
4931                         goto out;
4932                 }
4933         }
4934
4935         if (extend) {
4936                 ret = ocfs2_extend_xattr_bucket(inode,
4937                                                 ctxt->handle,
4938                                                 first,
4939                                                 bucket_blkno(target),
4940                                                 num_clusters);
4941                 if (ret)
4942                         mlog_errno(ret);
4943         }
4944
4945 out:
4946         ocfs2_xattr_bucket_free(first);
4947
4948         return ret;
4949 }
4950
4951 static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
4952                                         struct ocfs2_xattr_bucket *bucket,
4953                                         int offs)
4954 {
4955         int block_off = offs >> inode->i_sb->s_blocksize_bits;
4956
4957         offs = offs % inode->i_sb->s_blocksize;
4958         return bucket_block(bucket, block_off) + offs;
4959 }
4960
4961 /*
4962  * Handle the normal xattr set, including replace, delete and new.
4963  *
4964  * Note: "local" indicates the real data's locality. So we can't
4965  * just its bucket locality by its length.
4966  */
4967 static void ocfs2_xattr_set_entry_normal(struct inode *inode,
4968                                          struct ocfs2_xattr_info *xi,
4969                                          struct ocfs2_xattr_search *xs,
4970                                          u32 name_hash,
4971                                          int local)
4972 {
4973         struct ocfs2_xattr_entry *last, *xe;
4974         int name_len = strlen(xi->name);
4975         struct ocfs2_xattr_header *xh = xs->header;
4976         u16 count = le16_to_cpu(xh->xh_count), start;
4977         size_t blocksize = inode->i_sb->s_blocksize;
4978         char *val;
4979         size_t offs, size, new_size;
4980         struct ocfs2_xa_loc loc;
4981
4982         ocfs2_init_xattr_bucket_xa_loc(&loc, xs->bucket,
4983                                        xs->not_found ? NULL : xs->here);
4984         last = &xh->xh_entries[count];
4985         if (!xs->not_found) {
4986                 xe = xs->here;
4987                 offs = le16_to_cpu(xe->xe_name_offset);
4988                 if (ocfs2_xattr_is_local(xe))
4989                         size = OCFS2_XATTR_SIZE(name_len) +
4990                         OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
4991                 else
4992                         size = OCFS2_XATTR_SIZE(name_len) +
4993                         OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
4994
4995                 /*
4996                  * If the new value will be stored outside, xi->value has been
4997                  * initalized as an empty ocfs2_xattr_value_root, and the same
4998                  * goes with xi->value_len, so we can set new_size safely here.
4999                  * See ocfs2_xattr_set_in_bucket.
5000                  */
5001                 new_size = OCFS2_XATTR_SIZE(name_len) +
5002                            OCFS2_XATTR_SIZE(xi->value_len);
5003
5004                 ocfs2_xa_wipe_namevalue(&loc);
5005                 if (xi->value) {
5006                         if (new_size > size)
5007                                 goto set_new_name_value;
5008
5009                         /* Now replace the old value with new one. */
5010                         if (local)
5011                                 xe->xe_value_size = cpu_to_le64(xi->value_len);
5012                         else
5013                                 xe->xe_value_size = 0;
5014
5015                         val = ocfs2_xattr_bucket_get_val(inode,
5016                                                          xs->bucket, offs);
5017                         memset(val + OCFS2_XATTR_SIZE(name_len), 0,
5018                                size - OCFS2_XATTR_SIZE(name_len));
5019                         if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
5020                                 memcpy(val + OCFS2_XATTR_SIZE(name_len),
5021                                        xi->value, xi->value_len);
5022
5023                         le16_add_cpu(&xh->xh_name_value_len, new_size);
5024                         ocfs2_xattr_set_local(xe, local);
5025                         return;
5026                 } else {
5027                         /*
5028                          * Remove the old entry if there is more than one.
5029                          * We don't remove the last entry so that we can
5030                          * use it to indicate the hash value of the empty
5031                          * bucket.
5032                          */
5033                         last -= 1;
5034                         le16_add_cpu(&xh->xh_count, -1);
5035                         if (xh->xh_count) {
5036                                 memmove(xe, xe + 1,
5037                                         (void *)last - (void *)xe);
5038                                 memset(last, 0,
5039                                        sizeof(struct ocfs2_xattr_entry));
5040                         } else
5041                                 xh->xh_free_start =
5042                                         cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
5043
5044                         return;
5045                 }
5046         } else {
5047                 /* find a new entry for insert. */
5048                 int low = 0, high = count - 1, tmp;
5049                 struct ocfs2_xattr_entry *tmp_xe;
5050
5051                 while (low <= high && count) {
5052                         tmp = (low + high) / 2;
5053                         tmp_xe = &xh->xh_entries[tmp];
5054
5055                         if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
5056                                 low = tmp + 1;
5057                         else if (name_hash <
5058                                  le32_to_cpu(tmp_xe->xe_name_hash))
5059                                 high = tmp - 1;
5060                         else {
5061                                 low = tmp;
5062                                 break;
5063                         }
5064                 }
5065
5066                 xe = &xh->xh_entries[low];
5067                 if (low != count)
5068                         memmove(xe + 1, xe, (void *)last - (void *)xe);
5069
5070                 le16_add_cpu(&xh->xh_count, 1);
5071                 memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
5072                 xe->xe_name_hash = cpu_to_le32(name_hash);
5073                 xe->xe_name_len = name_len;
5074                 ocfs2_xattr_set_type(xe, xi->name_index);
5075         }
5076
5077 set_new_name_value:
5078         /* Insert the new name+value. */
5079         size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
5080
5081         /*
5082          * We must make sure that the name/value pair
5083          * exists in the same block.
5084          */
5085         offs = le16_to_cpu(xh->xh_free_start);
5086         start = offs - size;
5087
5088         if (start >> inode->i_sb->s_blocksize_bits !=
5089             (offs - 1) >> inode->i_sb->s_blocksize_bits) {
5090                 offs = offs - offs % blocksize;
5091                 xh->xh_free_start = cpu_to_le16(offs);
5092         }
5093
5094         val = ocfs2_xattr_bucket_get_val(inode, xs->bucket, offs - size);
5095         xe->xe_name_offset = cpu_to_le16(offs - size);
5096
5097         memset(val, 0, size);
5098         memcpy(val, xi->name, name_len);
5099         memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
5100
5101         xe->xe_value_size = cpu_to_le64(xi->value_len);
5102         ocfs2_xattr_set_local(xe, local);
5103         xs->here = xe;
5104         le16_add_cpu(&xh->xh_free_start, -size);
5105         le16_add_cpu(&xh->xh_name_value_len, size);
5106
5107         return;
5108 }
5109
5110 /*
5111  * Set the xattr entry in the specified bucket.
5112  * The bucket is indicated by xs->bucket and it should have the enough
5113  * space for the xattr insertion.
5114  */
5115 static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
5116                                            handle_t *handle,
5117                                            struct ocfs2_xattr_info *xi,
5118                                            struct ocfs2_xattr_search *xs,
5119                                            u32 name_hash,
5120                                            int local)
5121 {
5122         int ret;
5123         u64 blkno;
5124
5125         mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n",
5126              (unsigned long)xi->value_len, xi->name_index,
5127              (unsigned long long)bucket_blkno(xs->bucket));
5128
5129         if (!xs->bucket->bu_bhs[1]) {
5130                 blkno = bucket_blkno(xs->bucket);
5131                 ocfs2_xattr_bucket_relse(xs->bucket);
5132                 ret = ocfs2_read_xattr_bucket(xs->bucket, blkno);
5133                 if (ret) {
5134                         mlog_errno(ret);
5135                         goto out;
5136                 }
5137         }
5138
5139         ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
5140                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5141         if (ret < 0) {
5142                 mlog_errno(ret);
5143                 goto out;
5144         }
5145
5146         ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local);
5147         ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
5148
5149 out:
5150         return ret;
5151 }
5152
5153 /*
5154  * Truncate the specified xe_off entry in xattr bucket.
5155  * bucket is indicated by header_bh and len is the new length.
5156  * Both the ocfs2_xattr_value_root and the entry will be updated here.
5157  *
5158  * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
5159  */
5160 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
5161                                              struct ocfs2_xattr_bucket *bucket,
5162                                              int xe_off,
5163                                              int len,
5164                                              struct ocfs2_xattr_set_ctxt *ctxt)
5165 {
5166         int ret, offset;
5167         u64 value_blk;
5168         struct ocfs2_xattr_entry *xe;
5169         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5170         size_t blocksize = inode->i_sb->s_blocksize;
5171         struct ocfs2_xattr_value_buf vb = {
5172                 .vb_access = ocfs2_journal_access,
5173         };
5174
5175         xe = &xh->xh_entries[xe_off];
5176
5177         BUG_ON(!xe || ocfs2_xattr_is_local(xe));
5178
5179         offset = le16_to_cpu(xe->xe_name_offset) +
5180                  OCFS2_XATTR_SIZE(xe->xe_name_len);
5181
5182         value_blk = offset / blocksize;
5183
5184         /* We don't allow ocfs2_xattr_value to be stored in different block. */
5185         BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
5186
5187         vb.vb_bh = bucket->bu_bhs[value_blk];
5188         BUG_ON(!vb.vb_bh);
5189
5190         vb.vb_xv = (struct ocfs2_xattr_value_root *)
5191                 (vb.vb_bh->b_data + offset % blocksize);
5192
5193         /*
5194          * From here on out we have to dirty the bucket.  The generic
5195          * value calls only modify one of the bucket's bhs, but we need
5196          * to send the bucket at once.  So if they error, they *could* have
5197          * modified something.  We have to assume they did, and dirty
5198          * the whole bucket.  This leaves us in a consistent state.
5199          */
5200         mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
5201              xe_off, (unsigned long long)bucket_blkno(bucket), len);
5202         ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
5203         if (ret) {
5204                 mlog_errno(ret);
5205                 goto out;
5206         }
5207
5208         ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
5209                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5210         if (ret) {
5211                 mlog_errno(ret);
5212                 goto out;
5213         }
5214
5215         xe->xe_value_size = cpu_to_le64(len);
5216
5217         ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
5218
5219 out:
5220         return ret;
5221 }
5222
5223 static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
5224                                         struct ocfs2_xattr_search *xs,
5225                                         int len,
5226                                         struct ocfs2_xattr_set_ctxt *ctxt)
5227 {
5228         int ret, offset;
5229         struct ocfs2_xattr_entry *xe = xs->here;
5230         struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
5231
5232         BUG_ON(!xs->bucket->bu_bhs[0] || !xe || ocfs2_xattr_is_local(xe));
5233
5234         offset = xe - xh->xh_entries;
5235         ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket,
5236                                                 offset, len, ctxt);
5237         if (ret)
5238                 mlog_errno(ret);
5239
5240         return ret;
5241 }
5242
5243 static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
5244                                                 handle_t *handle,
5245                                                 struct ocfs2_xattr_search *xs,
5246                                                 char *val,
5247                                                 int value_len)
5248 {
5249         int ret, offset, block_off;
5250         struct ocfs2_xattr_value_root *xv;
5251         struct ocfs2_xattr_entry *xe = xs->here;
5252         struct ocfs2_xattr_header *xh = bucket_xh(xs->bucket);
5253         void *base;
5254         struct ocfs2_xattr_value_buf vb = {
5255                 .vb_access = ocfs2_journal_access,
5256         };
5257
5258         BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
5259
5260         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb, xh,
5261                                                 xe - xh->xh_entries,
5262                                                 &block_off,
5263                                                 &offset);
5264         if (ret) {
5265                 mlog_errno(ret);
5266                 goto out;
5267         }
5268
5269         base = bucket_block(xs->bucket, block_off);
5270         xv = (struct ocfs2_xattr_value_root *)(base + offset +
5271                  OCFS2_XATTR_SIZE(xe->xe_name_len));
5272
5273         vb.vb_xv = xv;
5274         vb.vb_bh = xs->bucket->bu_bhs[block_off];
5275         ret = __ocfs2_xattr_set_value_outside(inode, handle,
5276                                               &vb, val, value_len);
5277         if (ret)
5278                 mlog_errno(ret);
5279 out:
5280         return ret;
5281 }
5282
5283 static int ocfs2_rm_xattr_cluster(struct inode *inode,
5284                                   struct buffer_head *root_bh,
5285                                   u64 blkno,
5286                                   u32 cpos,
5287                                   u32 len,
5288                                   void *para)
5289 {
5290         int ret;
5291         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5292         struct inode *tl_inode = osb->osb_tl_inode;
5293         handle_t *handle;
5294         struct ocfs2_xattr_block *xb =
5295                         (struct ocfs2_xattr_block *)root_bh->b_data;
5296         struct ocfs2_alloc_context *meta_ac = NULL;
5297         struct ocfs2_cached_dealloc_ctxt dealloc;
5298         struct ocfs2_extent_tree et;
5299
5300         ret = ocfs2_iterate_xattr_buckets(inode, blkno, len,
5301                                           ocfs2_delete_xattr_in_bucket, para);
5302         if (ret) {
5303                 mlog_errno(ret);
5304                 return ret;
5305         }
5306
5307         ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5308
5309         ocfs2_init_dealloc_ctxt(&dealloc);
5310
5311         mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
5312              cpos, len, (unsigned long long)blkno);
5313
5314         ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode), blkno,
5315                                                len);
5316
5317         ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
5318         if (ret) {
5319                 mlog_errno(ret);
5320                 return ret;
5321         }
5322
5323         mutex_lock(&tl_inode->i_mutex);
5324
5325         if (ocfs2_truncate_log_needs_flush(osb)) {
5326                 ret = __ocfs2_flush_truncate_log(osb);
5327                 if (ret < 0) {
5328                         mlog_errno(ret);
5329                         goto out;
5330                 }
5331         }
5332
5333         handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
5334         if (IS_ERR(handle)) {
5335                 ret = -ENOMEM;
5336                 mlog_errno(ret);
5337                 goto out;
5338         }
5339
5340         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5341                                       OCFS2_JOURNAL_ACCESS_WRITE);
5342         if (ret) {
5343                 mlog_errno(ret);
5344                 goto out_commit;
5345         }
5346
5347         ret = ocfs2_remove_extent(handle, &et, cpos, len, meta_ac,
5348                                   &dealloc);
5349         if (ret) {
5350                 mlog_errno(ret);
5351                 goto out_commit;
5352         }
5353
5354         le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
5355
5356         ret = ocfs2_journal_dirty(handle, root_bh);
5357         if (ret) {
5358                 mlog_errno(ret);
5359                 goto out_commit;
5360         }
5361
5362         ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
5363         if (ret)
5364                 mlog_errno(ret);
5365
5366 out_commit:
5367         ocfs2_commit_trans(osb, handle);
5368 out:
5369         ocfs2_schedule_truncate_log_flush(osb, 1);
5370
5371         mutex_unlock(&tl_inode->i_mutex);
5372
5373         if (meta_ac)
5374                 ocfs2_free_alloc_context(meta_ac);
5375
5376         ocfs2_run_deallocs(osb, &dealloc);
5377
5378         return ret;
5379 }
5380
5381 static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
5382                                          handle_t *handle,
5383                                          struct ocfs2_xattr_search *xs)
5384 {
5385         struct ocfs2_xattr_header *xh = bucket_xh(xs->bucket);
5386         struct ocfs2_xattr_entry *last = &xh->xh_entries[
5387                                                 le16_to_cpu(xh->xh_count) - 1];
5388         int ret = 0;
5389
5390         ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
5391                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5392         if (ret) {
5393                 mlog_errno(ret);
5394                 return;
5395         }
5396
5397         /* Remove the old entry. */
5398         memmove(xs->here, xs->here + 1,
5399                 (void *)last - (void *)xs->here);
5400         memset(last, 0, sizeof(struct ocfs2_xattr_entry));
5401         le16_add_cpu(&xh->xh_count, -1);
5402
5403         ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
5404 }
5405
5406 /*
5407  * Set the xattr name/value in the bucket specified in xs.
5408  *
5409  * As the new value in xi may be stored in the bucket or in an outside cluster,
5410  * we divide the whole process into 3 steps:
5411  * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
5412  * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
5413  * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
5414  * 4. If the clusters for the new outside value can't be allocated, we need
5415  *    to free the xattr we allocated in set.
5416  */
5417 static int ocfs2_xattr_set_in_bucket(struct inode *inode,
5418                                      struct ocfs2_xattr_info *xi,
5419                                      struct ocfs2_xattr_search *xs,
5420                                      struct ocfs2_xattr_set_ctxt *ctxt)
5421 {
5422         int ret, local = 1;
5423         size_t value_len;
5424         char *val = (char *)xi->value;
5425         struct ocfs2_xattr_entry *xe = xs->here;
5426         u32 name_hash = ocfs2_xattr_name_hash(inode, xi->name,
5427                                               strlen(xi->name));
5428
5429         if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
5430                 /*
5431                  * We need to truncate the xattr storage first.
5432                  *
5433                  * If both the old and new value are stored to
5434                  * outside block, we only need to truncate
5435                  * the storage and then set the value outside.
5436                  *
5437                  * If the new value should be stored within block,
5438                  * we should free all the outside block first and
5439                  * the modification to the xattr block will be done
5440                  * by following steps.
5441                  */
5442                 if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
5443                         value_len = xi->value_len;
5444                 else
5445                         value_len = 0;
5446
5447                 ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
5448                                                            value_len,
5449                                                            ctxt);
5450                 if (ret)
5451                         goto out;
5452
5453                 if (value_len)
5454                         goto set_value_outside;
5455         }
5456
5457         value_len = xi->value_len;
5458         /* So we have to handle the inside block change now. */
5459         if (value_len > OCFS2_XATTR_INLINE_SIZE) {
5460                 /*
5461                  * If the new value will be stored outside of block,
5462                  * initalize a new empty value root and insert it first.
5463                  */
5464                 local = 0;
5465                 xi->value = &def_xv;
5466                 xi->value_len = OCFS2_XATTR_ROOT_SIZE;
5467         }
5468
5469         ret = ocfs2_xattr_set_entry_in_bucket(inode, ctxt->handle, xi, xs,
5470                                               name_hash, local);
5471         if (ret) {
5472                 mlog_errno(ret);
5473                 goto out;
5474         }
5475
5476         if (value_len <= OCFS2_XATTR_INLINE_SIZE)
5477                 goto out;
5478
5479         /* allocate the space now for the outside block storage. */
5480         ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
5481                                                    value_len, ctxt);
5482         if (ret) {
5483                 mlog_errno(ret);
5484
5485                 if (xs->not_found) {
5486                         /*
5487                          * We can't allocate enough clusters for outside
5488                          * storage and we have allocated xattr already,
5489                          * so need to remove it.
5490                          */
5491                         ocfs2_xattr_bucket_remove_xs(inode, ctxt->handle, xs);
5492                 }
5493                 goto out;
5494         }
5495
5496 set_value_outside:
5497         ret = ocfs2_xattr_bucket_set_value_outside(inode, ctxt->handle,
5498                                                    xs, val, value_len);
5499 out:
5500         return ret;
5501 }
5502
5503 /*
5504  * check whether the xattr bucket is filled up with the same hash value.
5505  * If we want to insert the xattr with the same hash, return -ENOSPC.
5506  * If we want to insert a xattr with different hash value, go ahead
5507  * and ocfs2_divide_xattr_bucket will handle this.
5508  */
5509 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
5510                                               struct ocfs2_xattr_bucket *bucket,
5511                                               const char *name)
5512 {
5513         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5514         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5515
5516         if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5517                 return 0;
5518
5519         if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5520             xh->xh_entries[0].xe_name_hash) {
5521                 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5522                      "hash = %u\n",
5523                      (unsigned long long)bucket_blkno(bucket),
5524                      le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5525                 return -ENOSPC;
5526         }
5527
5528         return 0;
5529 }
5530
5531 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5532                                              struct ocfs2_xattr_info *xi,
5533                                              struct ocfs2_xattr_search *xs,
5534                                              struct ocfs2_xattr_set_ctxt *ctxt)
5535 {
5536         struct ocfs2_xattr_header *xh;
5537         struct ocfs2_xattr_entry *xe;
5538         u16 count, header_size, xh_free_start;
5539         int free, max_free, need, old;
5540         size_t value_size = 0, name_len = strlen(xi->name);
5541         size_t blocksize = inode->i_sb->s_blocksize;
5542         int ret, allocation = 0;
5543
5544         mlog_entry("Set xattr %s in xattr index block\n", xi->name);
5545
5546 try_again:
5547         xh = xs->header;
5548         count = le16_to_cpu(xh->xh_count);
5549         xh_free_start = le16_to_cpu(xh->xh_free_start);
5550         header_size = sizeof(struct ocfs2_xattr_header) +
5551                         count * sizeof(struct ocfs2_xattr_entry);
5552         max_free = OCFS2_XATTR_BUCKET_SIZE - header_size -
5553                 le16_to_cpu(xh->xh_name_value_len) - OCFS2_XATTR_HEADER_GAP;
5554
5555         mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
5556                         "of %u which exceed block size\n",
5557                         (unsigned long long)bucket_blkno(xs->bucket),
5558                         header_size);
5559
5560         if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
5561                 value_size = OCFS2_XATTR_ROOT_SIZE;
5562         else if (xi->value)
5563                 value_size = OCFS2_XATTR_SIZE(xi->value_len);
5564
5565         if (xs->not_found)
5566                 need = sizeof(struct ocfs2_xattr_entry) +
5567                         OCFS2_XATTR_SIZE(name_len) + value_size;
5568         else {
5569                 need = value_size + OCFS2_XATTR_SIZE(name_len);
5570
5571                 /*
5572                  * We only replace the old value if the new length is smaller
5573                  * than the old one. Otherwise we will allocate new space in the
5574                  * bucket to store it.
5575                  */
5576                 xe = xs->here;
5577                 if (ocfs2_xattr_is_local(xe))
5578                         old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
5579                 else
5580                         old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
5581
5582                 if (old >= value_size)
5583                         need = 0;
5584         }
5585
5586         free = xh_free_start - header_size - OCFS2_XATTR_HEADER_GAP;
5587         /*
5588          * We need to make sure the new name/value pair
5589          * can exist in the same block.
5590          */
5591         if (xh_free_start % blocksize < need)
5592                 free -= xh_free_start % blocksize;
5593
5594         mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
5595              "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
5596              " %u\n", xs->not_found,
5597              (unsigned long long)bucket_blkno(xs->bucket),
5598              free, need, max_free, le16_to_cpu(xh->xh_free_start),
5599              le16_to_cpu(xh->xh_name_value_len));
5600
5601         if (free < need ||
5602             (xs->not_found &&
5603              count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb))) {
5604                 if (need <= max_free &&
5605                     count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
5606                         /*
5607                          * We can create the space by defragment. Since only the
5608                          * name/value will be moved, the xe shouldn't be changed
5609                          * in xs.
5610                          */
5611                         ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5612                                                         xs->bucket);
5613                         if (ret) {
5614                                 mlog_errno(ret);
5615                                 goto out;
5616                         }
5617
5618                         xh_free_start = le16_to_cpu(xh->xh_free_start);
5619                         free = xh_free_start - header_size
5620                                 - OCFS2_XATTR_HEADER_GAP;
5621                         if (xh_free_start % blocksize < need)
5622                                 free -= xh_free_start % blocksize;
5623
5624                         if (free >= need)
5625                                 goto xattr_set;
5626
5627                         mlog(0, "Can't get enough space for xattr insert by "
5628                              "defragment. Need %u bytes, but we have %d, so "
5629                              "allocate new bucket for it.\n", need, free);
5630                 }
5631
5632                 /*
5633                  * We have to add new buckets or clusters and one
5634                  * allocation should leave us enough space for insert.
5635                  */
5636                 BUG_ON(allocation);
5637
5638                 /*
5639                  * We do not allow for overlapping ranges between buckets. And
5640                  * the maximum number of collisions we will allow for then is
5641                  * one bucket's worth, so check it here whether we need to
5642                  * add a new bucket for the insert.
5643                  */
5644                 ret = ocfs2_check_xattr_bucket_collision(inode,
5645                                                          xs->bucket,
5646                                                          xi->name);
5647                 if (ret) {
5648                         mlog_errno(ret);
5649                         goto out;
5650                 }
5651
5652                 ret = ocfs2_add_new_xattr_bucket(inode,
5653                                                  xs->xattr_bh,
5654                                                  xs->bucket,
5655                                                  ctxt);
5656                 if (ret) {
5657                         mlog_errno(ret);
5658                         goto out;
5659                 }
5660
5661                 /*
5662                  * ocfs2_add_new_xattr_bucket() will have updated
5663                  * xs->bucket if it moved, but it will not have updated
5664                  * any of the other search fields.  Thus, we drop it and
5665                  * re-search.  Everything should be cached, so it'll be
5666                  * quick.
5667                  */
5668                 ocfs2_xattr_bucket_relse(xs->bucket);
5669                 ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
5670                                                    xi->name_index,
5671                                                    xi->name, xs);
5672                 if (ret && ret != -ENODATA)
5673                         goto out;
5674                 xs->not_found = ret;
5675                 allocation = 1;
5676                 goto try_again;
5677         }
5678
5679 xattr_set:
5680         ret = ocfs2_xattr_set_in_bucket(inode, xi, xs, ctxt);
5681 out:
5682         mlog_exit(ret);
5683         return ret;
5684 }
5685
5686 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
5687                                         struct ocfs2_xattr_bucket *bucket,
5688                                         void *para)
5689 {
5690         int ret = 0, ref_credits;
5691         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5692         u16 i;
5693         struct ocfs2_xattr_entry *xe;
5694         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5695         struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
5696         int credits = ocfs2_remove_extent_credits(osb->sb) +
5697                 ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5698         struct ocfs2_xattr_value_root *xv;
5699         struct ocfs2_rm_xattr_bucket_para *args =
5700                         (struct ocfs2_rm_xattr_bucket_para *)para;
5701
5702         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
5703
5704         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5705                 xe = &xh->xh_entries[i];
5706                 if (ocfs2_xattr_is_local(xe))
5707                         continue;
5708
5709                 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket,
5710                                                       i, &xv, NULL);
5711
5712                 ret = ocfs2_lock_xattr_remove_allocators(inode, xv,
5713                                                          args->ref_ci,
5714                                                          args->ref_root_bh,
5715                                                          &ctxt.meta_ac,
5716                                                          &ref_credits);
5717
5718                 ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
5719                 if (IS_ERR(ctxt.handle)) {
5720                         ret = PTR_ERR(ctxt.handle);
5721                         mlog_errno(ret);
5722                         break;
5723                 }
5724
5725                 ret = ocfs2_xattr_bucket_value_truncate(inode, bucket,
5726                                                         i, 0, &ctxt);
5727
5728                 ocfs2_commit_trans(osb, ctxt.handle);
5729                 if (ctxt.meta_ac) {
5730                         ocfs2_free_alloc_context(ctxt.meta_ac);
5731                         ctxt.meta_ac = NULL;
5732                 }
5733                 if (ret) {
5734                         mlog_errno(ret);
5735                         break;
5736                 }
5737         }
5738
5739         if (ctxt.meta_ac)
5740                 ocfs2_free_alloc_context(ctxt.meta_ac);
5741         ocfs2_schedule_truncate_log_flush(osb, 1);
5742         ocfs2_run_deallocs(osb, &ctxt.dealloc);
5743         return ret;
5744 }
5745
5746 /*
5747  * Whenever we modify a xattr value root in the bucket(e.g, CoW
5748  * or change the extent record flag), we need to recalculate
5749  * the metaecc for the whole bucket. So it is done here.
5750  *
5751  * Note:
5752  * We have to give the extra credits for the caller.
5753  */
5754 static int ocfs2_xattr_bucket_post_refcount(struct inode *inode,
5755                                             handle_t *handle,
5756                                             void *para)
5757 {
5758         int ret;
5759         struct ocfs2_xattr_bucket *bucket =
5760                         (struct ocfs2_xattr_bucket *)para;
5761
5762         ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
5763                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5764         if (ret) {
5765                 mlog_errno(ret);
5766                 return ret;
5767         }
5768
5769         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
5770
5771         return 0;
5772 }
5773
5774 /*
5775  * Special action we need if the xattr value is refcounted.
5776  *
5777  * 1. If the xattr is refcounted, lock the tree.
5778  * 2. CoW the xattr if we are setting the new value and the value
5779  *    will be stored outside.
5780  * 3. In other case, decrease_refcount will work for us, so just
5781  *    lock the refcount tree, calculate the meta and credits is OK.
5782  *
5783  * We have to do CoW before ocfs2_init_xattr_set_ctxt since
5784  * currently CoW is a completed transaction, while this function
5785  * will also lock the allocators and let us deadlock. So we will
5786  * CoW the whole xattr value.
5787  */
5788 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
5789                                         struct ocfs2_dinode *di,
5790                                         struct ocfs2_xattr_info *xi,
5791                                         struct ocfs2_xattr_search *xis,
5792                                         struct ocfs2_xattr_search *xbs,
5793                                         struct ocfs2_refcount_tree **ref_tree,
5794                                         int *meta_add,
5795                                         int *credits)
5796 {
5797         int ret = 0;
5798         struct ocfs2_xattr_block *xb;
5799         struct ocfs2_xattr_entry *xe;
5800         char *base;
5801         u32 p_cluster, num_clusters;
5802         unsigned int ext_flags;
5803         int name_offset, name_len;
5804         struct ocfs2_xattr_value_buf vb;
5805         struct ocfs2_xattr_bucket *bucket = NULL;
5806         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5807         struct ocfs2_post_refcount refcount;
5808         struct ocfs2_post_refcount *p = NULL;
5809         struct buffer_head *ref_root_bh = NULL;
5810
5811         if (!xis->not_found) {
5812                 xe = xis->here;
5813                 name_offset = le16_to_cpu(xe->xe_name_offset);
5814                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5815                 base = xis->base;
5816                 vb.vb_bh = xis->inode_bh;
5817                 vb.vb_access = ocfs2_journal_access_di;
5818         } else {
5819                 int i, block_off = 0;
5820                 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
5821                 xe = xbs->here;
5822                 name_offset = le16_to_cpu(xe->xe_name_offset);
5823                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5824                 i = xbs->here - xbs->header->xh_entries;
5825
5826                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
5827                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
5828                                                         bucket_xh(xbs->bucket),
5829                                                         i, &block_off,
5830                                                         &name_offset);
5831                         if (ret) {
5832                                 mlog_errno(ret);
5833                                 goto out;
5834                         }
5835                         base = bucket_block(xbs->bucket, block_off);
5836                         vb.vb_bh = xbs->bucket->bu_bhs[block_off];
5837                         vb.vb_access = ocfs2_journal_access;
5838
5839                         if (ocfs2_meta_ecc(osb)) {
5840                                 /*create parameters for ocfs2_post_refcount. */
5841                                 bucket = xbs->bucket;
5842                                 refcount.credits = bucket->bu_blocks;
5843                                 refcount.para = bucket;
5844                                 refcount.func =
5845                                         ocfs2_xattr_bucket_post_refcount;
5846                                 p = &refcount;
5847                         }
5848                 } else {
5849                         base = xbs->base;
5850                         vb.vb_bh = xbs->xattr_bh;
5851                         vb.vb_access = ocfs2_journal_access_xb;
5852                 }
5853         }
5854
5855         if (ocfs2_xattr_is_local(xe))
5856                 goto out;
5857
5858         vb.vb_xv = (struct ocfs2_xattr_value_root *)
5859                                 (base + name_offset + name_len);
5860
5861         ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
5862                                        &num_clusters, &vb.vb_xv->xr_list,
5863                                        &ext_flags);
5864         if (ret) {
5865                 mlog_errno(ret);
5866                 goto out;
5867         }
5868
5869         /*
5870          * We just need to check the 1st extent record, since we always
5871          * CoW the whole xattr. So there shouldn't be a xattr with
5872          * some REFCOUNT extent recs after the 1st one.
5873          */
5874         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
5875                 goto out;
5876
5877         ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
5878                                        1, ref_tree, &ref_root_bh);
5879         if (ret) {
5880                 mlog_errno(ret);
5881                 goto out;
5882         }
5883
5884         /*
5885          * If we are deleting the xattr or the new size will be stored inside,
5886          * cool, leave it there, the xattr truncate process will remove them
5887          * for us(it still needs the refcount tree lock and the meta, credits).
5888          * And the worse case is that every cluster truncate will split the
5889          * refcount tree, and make the original extent become 3. So we will need
5890          * 2 * cluster more extent recs at most.
5891          */
5892         if (!xi->value || xi->value_len <= OCFS2_XATTR_INLINE_SIZE) {
5893
5894                 ret = ocfs2_refcounted_xattr_delete_need(inode,
5895                                                          &(*ref_tree)->rf_ci,
5896                                                          ref_root_bh, vb.vb_xv,
5897                                                          meta_add, credits);
5898                 if (ret)
5899                         mlog_errno(ret);
5900                 goto out;
5901         }
5902
5903         ret = ocfs2_refcount_cow_xattr(inode, di, &vb,
5904                                        *ref_tree, ref_root_bh, 0,
5905                                        le32_to_cpu(vb.vb_xv->xr_clusters), p);
5906         if (ret)
5907                 mlog_errno(ret);
5908
5909 out:
5910         brelse(ref_root_bh);
5911         return ret;
5912 }
5913
5914 /*
5915  * Add the REFCOUNTED flags for all the extent rec in ocfs2_xattr_value_root.
5916  * The physical clusters will be added to refcount tree.
5917  */
5918 static int ocfs2_xattr_value_attach_refcount(struct inode *inode,
5919                                 struct ocfs2_xattr_value_root *xv,
5920                                 struct ocfs2_extent_tree *value_et,
5921                                 struct ocfs2_caching_info *ref_ci,
5922                                 struct buffer_head *ref_root_bh,
5923                                 struct ocfs2_cached_dealloc_ctxt *dealloc,
5924                                 struct ocfs2_post_refcount *refcount)
5925 {
5926         int ret = 0;
5927         u32 clusters = le32_to_cpu(xv->xr_clusters);
5928         u32 cpos, p_cluster, num_clusters;
5929         struct ocfs2_extent_list *el = &xv->xr_list;
5930         unsigned int ext_flags;
5931
5932         cpos = 0;
5933         while (cpos < clusters) {
5934                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
5935                                                &num_clusters, el, &ext_flags);
5936
5937                 cpos += num_clusters;
5938                 if ((ext_flags & OCFS2_EXT_REFCOUNTED))
5939                         continue;
5940
5941                 BUG_ON(!p_cluster);
5942
5943                 ret = ocfs2_add_refcount_flag(inode, value_et,
5944                                               ref_ci, ref_root_bh,
5945                                               cpos - num_clusters,
5946                                               p_cluster, num_clusters,
5947                                               dealloc, refcount);
5948                 if (ret) {
5949                         mlog_errno(ret);
5950                         break;
5951                 }
5952         }
5953
5954         return ret;
5955 }
5956
5957 /*
5958  * Given a normal ocfs2_xattr_header, refcount all the entries which
5959  * have value stored outside.
5960  * Used for xattrs stored in inode and ocfs2_xattr_block.
5961  */
5962 static int ocfs2_xattr_attach_refcount_normal(struct inode *inode,
5963                                 struct ocfs2_xattr_value_buf *vb,
5964                                 struct ocfs2_xattr_header *header,
5965                                 struct ocfs2_caching_info *ref_ci,
5966                                 struct buffer_head *ref_root_bh,
5967                                 struct ocfs2_cached_dealloc_ctxt *dealloc)
5968 {
5969
5970         struct ocfs2_xattr_entry *xe;
5971         struct ocfs2_xattr_value_root *xv;
5972         struct ocfs2_extent_tree et;
5973         int i, ret = 0;
5974
5975         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
5976                 xe = &header->xh_entries[i];
5977
5978                 if (ocfs2_xattr_is_local(xe))
5979                         continue;
5980
5981                 xv = (struct ocfs2_xattr_value_root *)((void *)header +
5982                         le16_to_cpu(xe->xe_name_offset) +
5983                         OCFS2_XATTR_SIZE(xe->xe_name_len));
5984
5985                 vb->vb_xv = xv;
5986                 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
5987
5988                 ret = ocfs2_xattr_value_attach_refcount(inode, xv, &et,
5989                                                         ref_ci, ref_root_bh,
5990                                                         dealloc, NULL);
5991                 if (ret) {
5992                         mlog_errno(ret);
5993                         break;
5994                 }
5995         }
5996
5997         return ret;
5998 }
5999
6000 static int ocfs2_xattr_inline_attach_refcount(struct inode *inode,
6001                                 struct buffer_head *fe_bh,
6002                                 struct ocfs2_caching_info *ref_ci,
6003                                 struct buffer_head *ref_root_bh,
6004                                 struct ocfs2_cached_dealloc_ctxt *dealloc)
6005 {
6006         struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
6007         struct ocfs2_xattr_header *header = (struct ocfs2_xattr_header *)
6008                                 (fe_bh->b_data + inode->i_sb->s_blocksize -
6009                                 le16_to_cpu(di->i_xattr_inline_size));
6010         struct ocfs2_xattr_value_buf vb = {
6011                 .vb_bh = fe_bh,
6012                 .vb_access = ocfs2_journal_access_di,
6013         };
6014
6015         return ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
6016                                                   ref_ci, ref_root_bh, dealloc);
6017 }
6018
6019 struct ocfs2_xattr_tree_value_refcount_para {
6020         struct ocfs2_caching_info *ref_ci;
6021         struct buffer_head *ref_root_bh;
6022         struct ocfs2_cached_dealloc_ctxt *dealloc;
6023 };
6024
6025 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
6026                                            struct ocfs2_xattr_bucket *bucket,
6027                                            int offset,
6028                                            struct ocfs2_xattr_value_root **xv,
6029                                            struct buffer_head **bh)
6030 {
6031         int ret, block_off, name_offset;
6032         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
6033         struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
6034         void *base;
6035
6036         ret = ocfs2_xattr_bucket_get_name_value(sb,
6037                                                 bucket_xh(bucket),
6038                                                 offset,
6039                                                 &block_off,
6040                                                 &name_offset);
6041         if (ret) {
6042                 mlog_errno(ret);
6043                 goto out;
6044         }
6045
6046         base = bucket_block(bucket, block_off);
6047
6048         *xv = (struct ocfs2_xattr_value_root *)(base + name_offset +
6049                          OCFS2_XATTR_SIZE(xe->xe_name_len));
6050
6051         if (bh)
6052                 *bh = bucket->bu_bhs[block_off];
6053 out:
6054         return ret;
6055 }
6056
6057 /*
6058  * For a given xattr bucket, refcount all the entries which
6059  * have value stored outside.
6060  */
6061 static int ocfs2_xattr_bucket_value_refcount(struct inode *inode,
6062                                              struct ocfs2_xattr_bucket *bucket,
6063                                              void *para)
6064 {
6065         int i, ret = 0;
6066         struct ocfs2_extent_tree et;
6067         struct ocfs2_xattr_tree_value_refcount_para *ref =
6068                         (struct ocfs2_xattr_tree_value_refcount_para *)para;
6069         struct ocfs2_xattr_header *xh =
6070                         (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6071         struct ocfs2_xattr_entry *xe;
6072         struct ocfs2_xattr_value_buf vb = {
6073                 .vb_access = ocfs2_journal_access,
6074         };
6075         struct ocfs2_post_refcount refcount = {
6076                 .credits = bucket->bu_blocks,
6077                 .para = bucket,
6078                 .func = ocfs2_xattr_bucket_post_refcount,
6079         };
6080         struct ocfs2_post_refcount *p = NULL;
6081
6082         /* We only need post_refcount if we support metaecc. */
6083         if (ocfs2_meta_ecc(OCFS2_SB(inode->i_sb)))
6084                 p = &refcount;
6085
6086         mlog(0, "refcount bucket %llu, count = %u\n",
6087              (unsigned long long)bucket_blkno(bucket),
6088              le16_to_cpu(xh->xh_count));
6089         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6090                 xe = &xh->xh_entries[i];
6091
6092                 if (ocfs2_xattr_is_local(xe))
6093                         continue;
6094
6095                 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket, i,
6096                                                       &vb.vb_xv, &vb.vb_bh);
6097                 if (ret) {
6098                         mlog_errno(ret);
6099                         break;
6100                 }
6101
6102                 ocfs2_init_xattr_value_extent_tree(&et,
6103                                                    INODE_CACHE(inode), &vb);
6104
6105                 ret = ocfs2_xattr_value_attach_refcount(inode, vb.vb_xv,
6106                                                         &et, ref->ref_ci,
6107                                                         ref->ref_root_bh,
6108                                                         ref->dealloc, p);
6109                 if (ret) {
6110                         mlog_errno(ret);
6111                         break;
6112                 }
6113         }
6114
6115         return ret;
6116
6117 }
6118
6119 static int ocfs2_refcount_xattr_tree_rec(struct inode *inode,
6120                                      struct buffer_head *root_bh,
6121                                      u64 blkno, u32 cpos, u32 len, void *para)
6122 {
6123         return ocfs2_iterate_xattr_buckets(inode, blkno, len,
6124                                            ocfs2_xattr_bucket_value_refcount,
6125                                            para);
6126 }
6127
6128 static int ocfs2_xattr_block_attach_refcount(struct inode *inode,
6129                                 struct buffer_head *blk_bh,
6130                                 struct ocfs2_caching_info *ref_ci,
6131                                 struct buffer_head *ref_root_bh,
6132                                 struct ocfs2_cached_dealloc_ctxt *dealloc)
6133 {
6134         int ret = 0;
6135         struct ocfs2_xattr_block *xb =
6136                                 (struct ocfs2_xattr_block *)blk_bh->b_data;
6137
6138         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
6139                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
6140                 struct ocfs2_xattr_value_buf vb = {
6141                         .vb_bh = blk_bh,
6142                         .vb_access = ocfs2_journal_access_xb,
6143                 };
6144
6145                 ret = ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
6146                                                          ref_ci, ref_root_bh,
6147                                                          dealloc);
6148         } else {
6149                 struct ocfs2_xattr_tree_value_refcount_para para = {
6150                         .ref_ci = ref_ci,
6151                         .ref_root_bh = ref_root_bh,
6152                         .dealloc = dealloc,
6153                 };
6154
6155                 ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
6156                                                 ocfs2_refcount_xattr_tree_rec,
6157                                                 &para);
6158         }
6159
6160         return ret;
6161 }
6162
6163 int ocfs2_xattr_attach_refcount_tree(struct inode *inode,
6164                                      struct buffer_head *fe_bh,
6165                                      struct ocfs2_caching_info *ref_ci,
6166                                      struct buffer_head *ref_root_bh,
6167                                      struct ocfs2_cached_dealloc_ctxt *dealloc)
6168 {
6169         int ret = 0;
6170         struct ocfs2_inode_info *oi = OCFS2_I(inode);
6171         struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
6172         struct buffer_head *blk_bh = NULL;
6173
6174         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
6175                 ret = ocfs2_xattr_inline_attach_refcount(inode, fe_bh,
6176                                                          ref_ci, ref_root_bh,
6177                                                          dealloc);
6178                 if (ret) {
6179                         mlog_errno(ret);
6180                         goto out;
6181                 }
6182         }
6183
6184         if (!di->i_xattr_loc)
6185                 goto out;
6186
6187         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
6188                                      &blk_bh);
6189         if (ret < 0) {
6190                 mlog_errno(ret);
6191                 goto out;
6192         }
6193
6194         ret = ocfs2_xattr_block_attach_refcount(inode, blk_bh, ref_ci,
6195                                                 ref_root_bh, dealloc);
6196         if (ret)
6197                 mlog_errno(ret);
6198
6199         brelse(blk_bh);
6200 out:
6201
6202         return ret;
6203 }
6204
6205 typedef int (should_xattr_reflinked)(struct ocfs2_xattr_entry *xe);
6206 /*
6207  * Store the information we need in xattr reflink.
6208  * old_bh and new_bh are inode bh for the old and new inode.
6209  */
6210 struct ocfs2_xattr_reflink {
6211         struct inode *old_inode;
6212         struct inode *new_inode;
6213         struct buffer_head *old_bh;
6214         struct buffer_head *new_bh;
6215         struct ocfs2_caching_info *ref_ci;
6216         struct buffer_head *ref_root_bh;
6217         struct ocfs2_cached_dealloc_ctxt *dealloc;
6218         should_xattr_reflinked *xattr_reflinked;
6219 };
6220
6221 /*
6222  * Given a xattr header and xe offset,
6223  * return the proper xv and the corresponding bh.
6224  * xattr in inode, block and xattr tree have different implementaions.
6225  */
6226 typedef int (get_xattr_value_root)(struct super_block *sb,
6227                                    struct buffer_head *bh,
6228                                    struct ocfs2_xattr_header *xh,
6229                                    int offset,
6230                                    struct ocfs2_xattr_value_root **xv,
6231                                    struct buffer_head **ret_bh,
6232                                    void *para);
6233
6234 /*
6235  * Calculate all the xattr value root metadata stored in this xattr header and
6236  * credits we need if we create them from the scratch.
6237  * We use get_xattr_value_root so that all types of xattr container can use it.
6238  */
6239 static int ocfs2_value_metas_in_xattr_header(struct super_block *sb,
6240                                              struct buffer_head *bh,
6241                                              struct ocfs2_xattr_header *xh,
6242                                              int *metas, int *credits,
6243                                              int *num_recs,
6244                                              get_xattr_value_root *func,
6245                                              void *para)
6246 {
6247         int i, ret = 0;
6248         struct ocfs2_xattr_value_root *xv;
6249         struct ocfs2_xattr_entry *xe;
6250
6251         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6252                 xe = &xh->xh_entries[i];
6253                 if (ocfs2_xattr_is_local(xe))
6254                         continue;
6255
6256                 ret = func(sb, bh, xh, i, &xv, NULL, para);
6257                 if (ret) {
6258                         mlog_errno(ret);
6259                         break;
6260                 }
6261
6262                 *metas += le16_to_cpu(xv->xr_list.l_tree_depth) *
6263                           le16_to_cpu(xv->xr_list.l_next_free_rec);
6264
6265                 *credits += ocfs2_calc_extend_credits(sb,
6266                                                 &def_xv.xv.xr_list,
6267                                                 le32_to_cpu(xv->xr_clusters));
6268
6269                 /*
6270                  * If the value is a tree with depth > 1, We don't go deep
6271                  * to the extent block, so just calculate a maximum record num.
6272                  */
6273                 if (!xv->xr_list.l_tree_depth)
6274                         *num_recs += le16_to_cpu(xv->xr_list.l_next_free_rec);
6275                 else
6276                         *num_recs += ocfs2_clusters_for_bytes(sb,
6277                                                               XATTR_SIZE_MAX);
6278         }
6279
6280         return ret;
6281 }
6282
6283 /* Used by xattr inode and block to return the right xv and buffer_head. */
6284 static int ocfs2_get_xattr_value_root(struct super_block *sb,
6285                                       struct buffer_head *bh,
6286                                       struct ocfs2_xattr_header *xh,
6287                                       int offset,
6288                                       struct ocfs2_xattr_value_root **xv,
6289                                       struct buffer_head **ret_bh,
6290                                       void *para)
6291 {
6292         struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
6293
6294         *xv = (struct ocfs2_xattr_value_root *)((void *)xh +
6295                 le16_to_cpu(xe->xe_name_offset) +
6296                 OCFS2_XATTR_SIZE(xe->xe_name_len));
6297
6298         if (ret_bh)
6299                 *ret_bh = bh;
6300
6301         return 0;
6302 }
6303
6304 /*
6305  * Lock the meta_ac and caculate how much credits we need for reflink xattrs.
6306  * It is only used for inline xattr and xattr block.
6307  */
6308 static int ocfs2_reflink_lock_xattr_allocators(struct ocfs2_super *osb,
6309                                         struct ocfs2_xattr_header *xh,
6310                                         struct buffer_head *ref_root_bh,
6311                                         int *credits,
6312                                         struct ocfs2_alloc_context **meta_ac)
6313 {
6314         int ret, meta_add = 0, num_recs = 0;
6315         struct ocfs2_refcount_block *rb =
6316                         (struct ocfs2_refcount_block *)ref_root_bh->b_data;
6317
6318         *credits = 0;
6319
6320         ret = ocfs2_value_metas_in_xattr_header(osb->sb, NULL, xh,
6321                                                 &meta_add, credits, &num_recs,
6322                                                 ocfs2_get_xattr_value_root,
6323                                                 NULL);
6324         if (ret) {
6325                 mlog_errno(ret);
6326                 goto out;
6327         }
6328
6329         /*
6330          * We need to add/modify num_recs in refcount tree, so just calculate
6331          * an approximate number we need for refcount tree change.
6332          * Sometimes we need to split the tree, and after split,  half recs
6333          * will be moved to the new block, and a new block can only provide
6334          * half number of recs. So we multiple new blocks by 2.
6335          */
6336         num_recs = num_recs / ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6337         meta_add += num_recs;
6338         *credits += num_recs + num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6339         if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6340                 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6341                             le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6342         else
6343                 *credits += 1;
6344
6345         ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add, meta_ac);
6346         if (ret)
6347                 mlog_errno(ret);
6348
6349 out:
6350         return ret;
6351 }
6352
6353 /*
6354  * Given a xattr header, reflink all the xattrs in this container.
6355  * It can be used for inode, block and bucket.
6356  *
6357  * NOTE:
6358  * Before we call this function, the caller has memcpy the xattr in
6359  * old_xh to the new_xh.
6360  *
6361  * If args.xattr_reflinked is set, call it to decide whether the xe should
6362  * be reflinked or not. If not, remove it from the new xattr header.
6363  */
6364 static int ocfs2_reflink_xattr_header(handle_t *handle,
6365                                       struct ocfs2_xattr_reflink *args,
6366                                       struct buffer_head *old_bh,
6367                                       struct ocfs2_xattr_header *xh,
6368                                       struct buffer_head *new_bh,
6369                                       struct ocfs2_xattr_header *new_xh,
6370                                       struct ocfs2_xattr_value_buf *vb,
6371                                       struct ocfs2_alloc_context *meta_ac,
6372                                       get_xattr_value_root *func,
6373                                       void *para)
6374 {
6375         int ret = 0, i, j;
6376         struct super_block *sb = args->old_inode->i_sb;
6377         struct buffer_head *value_bh;
6378         struct ocfs2_xattr_entry *xe, *last;
6379         struct ocfs2_xattr_value_root *xv, *new_xv;
6380         struct ocfs2_extent_tree data_et;
6381         u32 clusters, cpos, p_cluster, num_clusters;
6382         unsigned int ext_flags = 0;
6383
6384         mlog(0, "reflink xattr in container %llu, count = %u\n",
6385              (unsigned long long)old_bh->b_blocknr, le16_to_cpu(xh->xh_count));
6386
6387         last = &new_xh->xh_entries[le16_to_cpu(new_xh->xh_count)];
6388         for (i = 0, j = 0; i < le16_to_cpu(xh->xh_count); i++, j++) {
6389                 xe = &xh->xh_entries[i];
6390
6391                 if (args->xattr_reflinked && !args->xattr_reflinked(xe)) {
6392                         xe = &new_xh->xh_entries[j];
6393
6394                         le16_add_cpu(&new_xh->xh_count, -1);
6395                         if (new_xh->xh_count) {
6396                                 memmove(xe, xe + 1,
6397                                         (void *)last - (void *)xe);
6398                                 memset(last, 0,
6399                                        sizeof(struct ocfs2_xattr_entry));
6400                         }
6401
6402                         /*
6403                          * We don't want j to increase in the next round since
6404                          * it is already moved ahead.
6405                          */
6406                         j--;
6407                         continue;
6408                 }
6409
6410                 if (ocfs2_xattr_is_local(xe))
6411                         continue;
6412
6413                 ret = func(sb, old_bh, xh, i, &xv, NULL, para);
6414                 if (ret) {
6415                         mlog_errno(ret);
6416                         break;
6417                 }
6418
6419                 ret = func(sb, new_bh, new_xh, j, &new_xv, &value_bh, para);
6420                 if (ret) {
6421                         mlog_errno(ret);
6422                         break;
6423                 }
6424
6425                 /*
6426                  * For the xattr which has l_tree_depth = 0, all the extent
6427                  * recs have already be copied to the new xh with the
6428                  * propriate OCFS2_EXT_REFCOUNTED flag we just need to
6429                  * increase the refount count int the refcount tree.
6430                  *
6431                  * For the xattr which has l_tree_depth > 0, we need
6432                  * to initialize it to the empty default value root,
6433                  * and then insert the extents one by one.
6434                  */
6435                 if (xv->xr_list.l_tree_depth) {
6436                         memcpy(new_xv, &def_xv, sizeof(def_xv));
6437                         vb->vb_xv = new_xv;
6438                         vb->vb_bh = value_bh;
6439                         ocfs2_init_xattr_value_extent_tree(&data_et,
6440                                         INODE_CACHE(args->new_inode), vb);
6441                 }
6442
6443                 clusters = le32_to_cpu(xv->xr_clusters);
6444                 cpos = 0;
6445                 while (cpos < clusters) {
6446                         ret = ocfs2_xattr_get_clusters(args->old_inode,
6447                                                        cpos,
6448                                                        &p_cluster,
6449                                                        &num_clusters,
6450                                                        &xv->xr_list,
6451                                                        &ext_flags);
6452                         if (ret) {
6453                                 mlog_errno(ret);
6454                                 goto out;
6455                         }
6456
6457                         BUG_ON(!p_cluster);
6458
6459                         if (xv->xr_list.l_tree_depth) {
6460                                 ret = ocfs2_insert_extent(handle,
6461                                                 &data_et, cpos,
6462                                                 ocfs2_clusters_to_blocks(
6463                                                         args->old_inode->i_sb,
6464                                                         p_cluster),
6465                                                 num_clusters, ext_flags,
6466                                                 meta_ac);
6467                                 if (ret) {
6468                                         mlog_errno(ret);
6469                                         goto out;
6470                                 }
6471                         }
6472
6473                         ret = ocfs2_increase_refcount(handle, args->ref_ci,
6474                                                       args->ref_root_bh,
6475                                                       p_cluster, num_clusters,
6476                                                       meta_ac, args->dealloc);
6477                         if (ret) {
6478                                 mlog_errno(ret);
6479                                 goto out;
6480                         }
6481
6482                         cpos += num_clusters;
6483                 }
6484         }
6485
6486 out:
6487         return ret;
6488 }
6489
6490 static int ocfs2_reflink_xattr_inline(struct ocfs2_xattr_reflink *args)
6491 {
6492         int ret = 0, credits = 0;
6493         handle_t *handle;
6494         struct ocfs2_super *osb = OCFS2_SB(args->old_inode->i_sb);
6495         struct ocfs2_dinode *di = (struct ocfs2_dinode *)args->old_bh->b_data;
6496         int inline_size = le16_to_cpu(di->i_xattr_inline_size);
6497         int header_off = osb->sb->s_blocksize - inline_size;
6498         struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)
6499                                         (args->old_bh->b_data + header_off);
6500         struct ocfs2_xattr_header *new_xh = (struct ocfs2_xattr_header *)
6501                                         (args->new_bh->b_data + header_off);
6502         struct ocfs2_alloc_context *meta_ac = NULL;
6503         struct ocfs2_inode_info *new_oi;
6504         struct ocfs2_dinode *new_di;
6505         struct ocfs2_xattr_value_buf vb = {
6506                 .vb_bh = args->new_bh,
6507                 .vb_access = ocfs2_journal_access_di,
6508         };
6509
6510         ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6511                                                   &credits, &meta_ac);
6512         if (ret) {
6513                 mlog_errno(ret);
6514                 goto out;
6515         }
6516
6517         handle = ocfs2_start_trans(osb, credits);
6518         if (IS_ERR(handle)) {
6519                 ret = PTR_ERR(handle);
6520                 mlog_errno(ret);
6521                 goto out;
6522         }
6523
6524         ret = ocfs2_journal_access_di(handle, INODE_CACHE(args->new_inode),
6525                                       args->new_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6526         if (ret) {
6527                 mlog_errno(ret);
6528                 goto out_commit;
6529         }
6530
6531         memcpy(args->new_bh->b_data + header_off,
6532                args->old_bh->b_data + header_off, inline_size);
6533
6534         new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6535         new_di->i_xattr_inline_size = cpu_to_le16(inline_size);
6536
6537         ret = ocfs2_reflink_xattr_header(handle, args, args->old_bh, xh,
6538                                          args->new_bh, new_xh, &vb, meta_ac,
6539                                          ocfs2_get_xattr_value_root, NULL);
6540         if (ret) {
6541                 mlog_errno(ret);
6542                 goto out_commit;
6543         }
6544
6545         new_oi = OCFS2_I(args->new_inode);
6546         spin_lock(&new_oi->ip_lock);
6547         new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL | OCFS2_INLINE_XATTR_FL;
6548         new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6549         spin_unlock(&new_oi->ip_lock);
6550
6551         ocfs2_journal_dirty(handle, args->new_bh);
6552
6553 out_commit:
6554         ocfs2_commit_trans(osb, handle);
6555
6556 out:
6557         if (meta_ac)
6558                 ocfs2_free_alloc_context(meta_ac);
6559         return ret;
6560 }
6561
6562 static int ocfs2_create_empty_xattr_block(struct inode *inode,
6563                                           struct buffer_head *fe_bh,
6564                                           struct buffer_head **ret_bh,
6565                                           int indexed)
6566 {
6567         int ret;
6568         handle_t *handle;
6569         struct ocfs2_alloc_context *meta_ac;
6570         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6571
6572         ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
6573         if (ret < 0) {
6574                 mlog_errno(ret);
6575                 return ret;
6576         }
6577
6578         handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_CREATE_CREDITS);
6579         if (IS_ERR(handle)) {
6580                 ret = PTR_ERR(handle);
6581                 mlog_errno(ret);
6582                 goto out;
6583         }
6584
6585         mlog(0, "create new xattr block for inode %llu, index = %d\n",
6586              (unsigned long long)fe_bh->b_blocknr, indexed);
6587         ret = ocfs2_create_xattr_block(handle, inode, fe_bh,
6588                                        meta_ac, ret_bh, indexed);
6589         if (ret)
6590                 mlog_errno(ret);
6591
6592         ocfs2_commit_trans(osb, handle);
6593 out:
6594         ocfs2_free_alloc_context(meta_ac);
6595         return ret;
6596 }
6597
6598 static int ocfs2_reflink_xattr_block(struct ocfs2_xattr_reflink *args,
6599                                      struct buffer_head *blk_bh,
6600                                      struct buffer_head *new_blk_bh)
6601 {
6602         int ret = 0, credits = 0;
6603         handle_t *handle;
6604         struct ocfs2_inode_info *new_oi = OCFS2_I(args->new_inode);
6605         struct ocfs2_dinode *new_di;
6606         struct ocfs2_super *osb = OCFS2_SB(args->new_inode->i_sb);
6607         int header_off = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
6608         struct ocfs2_xattr_block *xb =
6609                         (struct ocfs2_xattr_block *)blk_bh->b_data;
6610         struct ocfs2_xattr_header *xh = &xb->xb_attrs.xb_header;
6611         struct ocfs2_xattr_block *new_xb =
6612                         (struct ocfs2_xattr_block *)new_blk_bh->b_data;
6613         struct ocfs2_xattr_header *new_xh = &new_xb->xb_attrs.xb_header;
6614         struct ocfs2_alloc_context *meta_ac;
6615         struct ocfs2_xattr_value_buf vb = {
6616                 .vb_bh = new_blk_bh,
6617                 .vb_access = ocfs2_journal_access_xb,
6618         };
6619
6620         ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6621                                                   &credits, &meta_ac);
6622         if (ret) {
6623                 mlog_errno(ret);
6624                 return ret;
6625         }
6626
6627         /* One more credits in case we need to add xattr flags in new inode. */
6628         handle = ocfs2_start_trans(osb, credits + 1);
6629         if (IS_ERR(handle)) {
6630                 ret = PTR_ERR(handle);
6631                 mlog_errno(ret);
6632                 goto out;
6633         }
6634
6635         if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6636                 ret = ocfs2_journal_access_di(handle,
6637                                               INODE_CACHE(args->new_inode),
6638                                               args->new_bh,
6639                                               OCFS2_JOURNAL_ACCESS_WRITE);
6640                 if (ret) {
6641                         mlog_errno(ret);
6642                         goto out_commit;
6643                 }
6644         }
6645
6646         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(args->new_inode),
6647                                       new_blk_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6648         if (ret) {
6649                 mlog_errno(ret);
6650                 goto out_commit;
6651         }
6652
6653         memcpy(new_blk_bh->b_data + header_off, blk_bh->b_data + header_off,
6654                osb->sb->s_blocksize - header_off);
6655
6656         ret = ocfs2_reflink_xattr_header(handle, args, blk_bh, xh,
6657                                          new_blk_bh, new_xh, &vb, meta_ac,
6658                                          ocfs2_get_xattr_value_root, NULL);
6659         if (ret) {
6660                 mlog_errno(ret);
6661                 goto out_commit;
6662         }
6663
6664         ocfs2_journal_dirty(handle, new_blk_bh);
6665
6666         if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6667                 new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6668                 spin_lock(&new_oi->ip_lock);
6669                 new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
6670                 new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6671                 spin_unlock(&new_oi->ip_lock);
6672
6673                 ocfs2_journal_dirty(handle, args->new_bh);
6674         }
6675
6676 out_commit:
6677         ocfs2_commit_trans(osb, handle);
6678
6679 out:
6680         ocfs2_free_alloc_context(meta_ac);
6681         return ret;
6682 }
6683
6684 struct ocfs2_reflink_xattr_tree_args {
6685         struct ocfs2_xattr_reflink *reflink;
6686         struct buffer_head *old_blk_bh;
6687         struct buffer_head *new_blk_bh;
6688         struct ocfs2_xattr_bucket *old_bucket;
6689         struct ocfs2_xattr_bucket *new_bucket;
6690 };
6691
6692 /*
6693  * NOTE:
6694  * We have to handle the case that both old bucket and new bucket
6695  * will call this function to get the right ret_bh.
6696  * So The caller must give us the right bh.
6697  */
6698 static int ocfs2_get_reflink_xattr_value_root(struct super_block *sb,
6699                                         struct buffer_head *bh,
6700                                         struct ocfs2_xattr_header *xh,
6701                                         int offset,
6702                                         struct ocfs2_xattr_value_root **xv,
6703                                         struct buffer_head **ret_bh,
6704                                         void *para)
6705 {
6706         struct ocfs2_reflink_xattr_tree_args *args =
6707                         (struct ocfs2_reflink_xattr_tree_args *)para;
6708         struct ocfs2_xattr_bucket *bucket;
6709
6710         if (bh == args->old_bucket->bu_bhs[0])
6711                 bucket = args->old_bucket;
6712         else
6713                 bucket = args->new_bucket;
6714
6715         return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6716                                                xv, ret_bh);
6717 }
6718
6719 struct ocfs2_value_tree_metas {
6720         int num_metas;
6721         int credits;
6722         int num_recs;
6723 };
6724
6725 static int ocfs2_value_tree_metas_in_bucket(struct super_block *sb,
6726                                         struct buffer_head *bh,
6727                                         struct ocfs2_xattr_header *xh,
6728                                         int offset,
6729                                         struct ocfs2_xattr_value_root **xv,
6730                                         struct buffer_head **ret_bh,
6731                                         void *para)
6732 {
6733         struct ocfs2_xattr_bucket *bucket =
6734                                 (struct ocfs2_xattr_bucket *)para;
6735
6736         return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6737                                                xv, ret_bh);
6738 }
6739
6740 static int ocfs2_calc_value_tree_metas(struct inode *inode,
6741                                       struct ocfs2_xattr_bucket *bucket,
6742                                       void *para)
6743 {
6744         struct ocfs2_value_tree_metas *metas =
6745                         (struct ocfs2_value_tree_metas *)para;
6746         struct ocfs2_xattr_header *xh =
6747                         (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6748
6749         /* Add the credits for this bucket first. */
6750         metas->credits += bucket->bu_blocks;
6751         return ocfs2_value_metas_in_xattr_header(inode->i_sb, bucket->bu_bhs[0],
6752                                         xh, &metas->num_metas,
6753                                         &metas->credits, &metas->num_recs,
6754                                         ocfs2_value_tree_metas_in_bucket,
6755                                         bucket);
6756 }
6757
6758 /*
6759  * Given a xattr extent rec starting from blkno and having len clusters,
6760  * iterate all the buckets calculate how much metadata we need for reflinking
6761  * all the ocfs2_xattr_value_root and lock the allocators accordingly.
6762  */
6763 static int ocfs2_lock_reflink_xattr_rec_allocators(
6764                                 struct ocfs2_reflink_xattr_tree_args *args,
6765                                 struct ocfs2_extent_tree *xt_et,
6766                                 u64 blkno, u32 len, int *credits,
6767                                 struct ocfs2_alloc_context **meta_ac,
6768                                 struct ocfs2_alloc_context **data_ac)
6769 {
6770         int ret, num_free_extents;
6771         struct ocfs2_value_tree_metas metas;
6772         struct ocfs2_super *osb = OCFS2_SB(args->reflink->old_inode->i_sb);
6773         struct ocfs2_refcount_block *rb;
6774
6775         memset(&metas, 0, sizeof(metas));
6776
6777         ret = ocfs2_iterate_xattr_buckets(args->reflink->old_inode, blkno, len,
6778                                           ocfs2_calc_value_tree_metas, &metas);
6779         if (ret) {
6780                 mlog_errno(ret);
6781                 goto out;
6782         }
6783
6784         *credits = metas.credits;
6785
6786         /*
6787          * Calculate we need for refcount tree change.
6788          *
6789          * We need to add/modify num_recs in refcount tree, so just calculate
6790          * an approximate number we need for refcount tree change.
6791          * Sometimes we need to split the tree, and after split,  half recs
6792          * will be moved to the new block, and a new block can only provide
6793          * half number of recs. So we multiple new blocks by 2.
6794          * In the end, we have to add credits for modifying the already
6795          * existed refcount block.
6796          */
6797         rb = (struct ocfs2_refcount_block *)args->reflink->ref_root_bh->b_data;
6798         metas.num_recs =
6799                 (metas.num_recs + ocfs2_refcount_recs_per_rb(osb->sb) - 1) /
6800                  ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6801         metas.num_metas += metas.num_recs;
6802         *credits += metas.num_recs +
6803                     metas.num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6804         if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6805                 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6806                             le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6807         else
6808                 *credits += 1;
6809
6810         /* count in the xattr tree change. */
6811         num_free_extents = ocfs2_num_free_extents(osb, xt_et);
6812         if (num_free_extents < 0) {
6813                 ret = num_free_extents;
6814                 mlog_errno(ret);
6815                 goto out;
6816         }
6817
6818         if (num_free_extents < len)
6819                 metas.num_metas += ocfs2_extend_meta_needed(xt_et->et_root_el);
6820
6821         *credits += ocfs2_calc_extend_credits(osb->sb,
6822                                               xt_et->et_root_el, len);
6823
6824         if (metas.num_metas) {
6825                 ret = ocfs2_reserve_new_metadata_blocks(osb, metas.num_metas,
6826                                                         meta_ac);
6827                 if (ret) {
6828                         mlog_errno(ret);
6829                         goto out;
6830                 }
6831         }
6832
6833         if (len) {
6834                 ret = ocfs2_reserve_clusters(osb, len, data_ac);
6835                 if (ret)
6836                         mlog_errno(ret);
6837         }
6838 out:
6839         if (ret) {
6840                 if (*meta_ac) {
6841                         ocfs2_free_alloc_context(*meta_ac);
6842                         meta_ac = NULL;
6843                 }
6844         }
6845
6846         return ret;
6847 }
6848
6849 static int ocfs2_reflink_xattr_buckets(handle_t *handle,
6850                                 u64 blkno, u64 new_blkno, u32 clusters,
6851                                 struct ocfs2_alloc_context *meta_ac,
6852                                 struct ocfs2_alloc_context *data_ac,
6853                                 struct ocfs2_reflink_xattr_tree_args *args)
6854 {
6855         int i, j, ret = 0;
6856         struct super_block *sb = args->reflink->old_inode->i_sb;
6857         u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
6858         u32 num_buckets = clusters * bpc;
6859         int bpb = args->old_bucket->bu_blocks;
6860         struct ocfs2_xattr_value_buf vb = {
6861                 .vb_access = ocfs2_journal_access,
6862         };
6863
6864         for (i = 0; i < num_buckets; i++, blkno += bpb, new_blkno += bpb) {
6865                 ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6866                 if (ret) {
6867                         mlog_errno(ret);
6868                         break;
6869                 }
6870
6871                 ret = ocfs2_init_xattr_bucket(args->new_bucket, new_blkno);
6872                 if (ret) {
6873                         mlog_errno(ret);
6874                         break;
6875                 }
6876
6877                 /*
6878                  * The real bucket num in this series of blocks is stored
6879                  * in the 1st bucket.
6880                  */
6881                 if (i == 0)
6882                         num_buckets = le16_to_cpu(
6883                                 bucket_xh(args->old_bucket)->xh_num_buckets);
6884
6885                 ret = ocfs2_xattr_bucket_journal_access(handle,
6886                                                 args->new_bucket,
6887                                                 OCFS2_JOURNAL_ACCESS_CREATE);
6888                 if (ret) {
6889                         mlog_errno(ret);
6890                         break;
6891                 }
6892
6893                 for (j = 0; j < bpb; j++)
6894                         memcpy(bucket_block(args->new_bucket, j),
6895                                bucket_block(args->old_bucket, j),
6896                                sb->s_blocksize);
6897
6898                 ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6899
6900                 ret = ocfs2_reflink_xattr_header(handle, args->reflink,
6901                                         args->old_bucket->bu_bhs[0],
6902                                         bucket_xh(args->old_bucket),
6903                                         args->new_bucket->bu_bhs[0],
6904                                         bucket_xh(args->new_bucket),
6905                                         &vb, meta_ac,
6906                                         ocfs2_get_reflink_xattr_value_root,
6907                                         args);
6908                 if (ret) {
6909                         mlog_errno(ret);
6910                         break;
6911                 }
6912
6913                 /*
6914                  * Re-access and dirty the bucket to calculate metaecc.
6915                  * Because we may extend the transaction in reflink_xattr_header
6916                  * which will let the already accessed block gone.
6917                  */
6918                 ret = ocfs2_xattr_bucket_journal_access(handle,
6919                                                 args->new_bucket,
6920                                                 OCFS2_JOURNAL_ACCESS_WRITE);
6921                 if (ret) {
6922                         mlog_errno(ret);
6923                         break;
6924                 }
6925
6926                 ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6927                 ocfs2_xattr_bucket_relse(args->old_bucket);
6928                 ocfs2_xattr_bucket_relse(args->new_bucket);
6929         }
6930
6931         ocfs2_xattr_bucket_relse(args->old_bucket);
6932         ocfs2_xattr_bucket_relse(args->new_bucket);
6933         return ret;
6934 }
6935 /*
6936  * Create the same xattr extent record in the new inode's xattr tree.
6937  */
6938 static int ocfs2_reflink_xattr_rec(struct inode *inode,
6939                                    struct buffer_head *root_bh,
6940                                    u64 blkno,
6941                                    u32 cpos,
6942                                    u32 len,
6943                                    void *para)
6944 {
6945         int ret, credits = 0;
6946         u32 p_cluster, num_clusters;
6947         u64 new_blkno;
6948         handle_t *handle;
6949         struct ocfs2_reflink_xattr_tree_args *args =
6950                         (struct ocfs2_reflink_xattr_tree_args *)para;
6951         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6952         struct ocfs2_alloc_context *meta_ac = NULL;
6953         struct ocfs2_alloc_context *data_ac = NULL;
6954         struct ocfs2_extent_tree et;
6955
6956         ocfs2_init_xattr_tree_extent_tree(&et,
6957                                           INODE_CACHE(args->reflink->new_inode),
6958                                           args->new_blk_bh);
6959
6960         ret = ocfs2_lock_reflink_xattr_rec_allocators(args, &et, blkno,
6961                                                       len, &credits,
6962                                                       &meta_ac, &data_ac);
6963         if (ret) {
6964                 mlog_errno(ret);
6965                 goto out;
6966         }
6967
6968         handle = ocfs2_start_trans(osb, credits);
6969         if (IS_ERR(handle)) {
6970                 ret = PTR_ERR(handle);
6971                 mlog_errno(ret);
6972                 goto out;
6973         }
6974
6975         ret = ocfs2_claim_clusters(osb, handle, data_ac,
6976                                    len, &p_cluster, &num_clusters);
6977         if (ret) {
6978                 mlog_errno(ret);
6979                 goto out_commit;
6980         }
6981
6982         new_blkno = ocfs2_clusters_to_blocks(osb->sb, p_cluster);
6983
6984         mlog(0, "reflink xattr buckets %llu to %llu, len %u\n",
6985              (unsigned long long)blkno, (unsigned long long)new_blkno, len);
6986         ret = ocfs2_reflink_xattr_buckets(handle, blkno, new_blkno, len,
6987                                           meta_ac, data_ac, args);
6988         if (ret) {
6989                 mlog_errno(ret);
6990                 goto out_commit;
6991         }
6992
6993         mlog(0, "insert new xattr extent rec start %llu len %u to %u\n",
6994              (unsigned long long)new_blkno, len, cpos);
6995         ret = ocfs2_insert_extent(handle, &et, cpos, new_blkno,
6996                                   len, 0, meta_ac);
6997         if (ret)
6998                 mlog_errno(ret);
6999
7000 out_commit:
7001         ocfs2_commit_trans(osb, handle);
7002
7003 out:
7004         if (meta_ac)
7005                 ocfs2_free_alloc_context(meta_ac);
7006         if (data_ac)
7007                 ocfs2_free_alloc_context(data_ac);
7008         return ret;
7009 }
7010
7011 /*
7012  * Create reflinked xattr buckets.
7013  * We will add bucket one by one, and refcount all the xattrs in the bucket
7014  * if they are stored outside.
7015  */
7016 static int ocfs2_reflink_xattr_tree(struct ocfs2_xattr_reflink *args,
7017                                     struct buffer_head *blk_bh,
7018                                     struct buffer_head *new_blk_bh)
7019 {
7020         int ret;
7021         struct ocfs2_reflink_xattr_tree_args para;
7022
7023         memset(&para, 0, sizeof(para));
7024         para.reflink = args;
7025         para.old_blk_bh = blk_bh;
7026         para.new_blk_bh = new_blk_bh;
7027
7028         para.old_bucket = ocfs2_xattr_bucket_new(args->old_inode);
7029         if (!para.old_bucket) {
7030                 mlog_errno(-ENOMEM);
7031                 return -ENOMEM;
7032         }
7033
7034         para.new_bucket = ocfs2_xattr_bucket_new(args->new_inode);
7035         if (!para.new_bucket) {
7036                 ret = -ENOMEM;
7037                 mlog_errno(ret);
7038                 goto out;
7039         }
7040
7041         ret = ocfs2_iterate_xattr_index_block(args->old_inode, blk_bh,
7042                                               ocfs2_reflink_xattr_rec,
7043                                               &para);
7044         if (ret)
7045                 mlog_errno(ret);
7046
7047 out:
7048         ocfs2_xattr_bucket_free(para.old_bucket);
7049         ocfs2_xattr_bucket_free(para.new_bucket);
7050         return ret;
7051 }
7052
7053 static int ocfs2_reflink_xattr_in_block(struct ocfs2_xattr_reflink *args,
7054                                         struct buffer_head *blk_bh)
7055 {
7056         int ret, indexed = 0;
7057         struct buffer_head *new_blk_bh = NULL;
7058         struct ocfs2_xattr_block *xb =
7059                         (struct ocfs2_xattr_block *)blk_bh->b_data;
7060
7061
7062         if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)
7063                 indexed = 1;
7064
7065         ret = ocfs2_create_empty_xattr_block(args->new_inode, args->new_bh,
7066                                              &new_blk_bh, indexed);
7067         if (ret) {
7068                 mlog_errno(ret);
7069                 goto out;
7070         }
7071
7072         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED))
7073                 ret = ocfs2_reflink_xattr_block(args, blk_bh, new_blk_bh);
7074         else
7075                 ret = ocfs2_reflink_xattr_tree(args, blk_bh, new_blk_bh);
7076         if (ret)
7077                 mlog_errno(ret);
7078
7079 out:
7080         brelse(new_blk_bh);
7081         return ret;
7082 }
7083
7084 static int ocfs2_reflink_xattr_no_security(struct ocfs2_xattr_entry *xe)
7085 {
7086         int type = ocfs2_xattr_get_type(xe);
7087
7088         return type != OCFS2_XATTR_INDEX_SECURITY &&
7089                type != OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS &&
7090                type != OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
7091 }
7092
7093 int ocfs2_reflink_xattrs(struct inode *old_inode,
7094                          struct buffer_head *old_bh,
7095                          struct inode *new_inode,
7096                          struct buffer_head *new_bh,
7097                          bool preserve_security)
7098 {
7099         int ret;
7100         struct ocfs2_xattr_reflink args;
7101         struct ocfs2_inode_info *oi = OCFS2_I(old_inode);
7102         struct ocfs2_dinode *di = (struct ocfs2_dinode *)old_bh->b_data;
7103         struct buffer_head *blk_bh = NULL;
7104         struct ocfs2_cached_dealloc_ctxt dealloc;
7105         struct ocfs2_refcount_tree *ref_tree;
7106         struct buffer_head *ref_root_bh = NULL;
7107
7108         ret = ocfs2_lock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7109                                        le64_to_cpu(di->i_refcount_loc),
7110                                        1, &ref_tree, &ref_root_bh);
7111         if (ret) {
7112                 mlog_errno(ret);
7113                 goto out;
7114         }
7115
7116         ocfs2_init_dealloc_ctxt(&dealloc);
7117
7118         args.old_inode = old_inode;
7119         args.new_inode = new_inode;
7120         args.old_bh = old_bh;
7121         args.new_bh = new_bh;
7122         args.ref_ci = &ref_tree->rf_ci;
7123         args.ref_root_bh = ref_root_bh;
7124         args.dealloc = &dealloc;
7125         if (preserve_security)
7126                 args.xattr_reflinked = NULL;
7127         else
7128                 args.xattr_reflinked = ocfs2_reflink_xattr_no_security;
7129
7130         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
7131                 ret = ocfs2_reflink_xattr_inline(&args);
7132                 if (ret) {
7133                         mlog_errno(ret);
7134                         goto out_unlock;
7135                 }
7136         }
7137
7138         if (!di->i_xattr_loc)
7139                 goto out_unlock;
7140
7141         ret = ocfs2_read_xattr_block(old_inode, le64_to_cpu(di->i_xattr_loc),
7142                                      &blk_bh);
7143         if (ret < 0) {
7144                 mlog_errno(ret);
7145                 goto out_unlock;
7146         }
7147
7148         ret = ocfs2_reflink_xattr_in_block(&args, blk_bh);
7149         if (ret)
7150                 mlog_errno(ret);
7151
7152         brelse(blk_bh);
7153
7154 out_unlock:
7155         ocfs2_unlock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7156                                    ref_tree, 1);
7157         brelse(ref_root_bh);
7158
7159         if (ocfs2_dealloc_has_cluster(&dealloc)) {
7160                 ocfs2_schedule_truncate_log_flush(OCFS2_SB(old_inode->i_sb), 1);
7161                 ocfs2_run_deallocs(OCFS2_SB(old_inode->i_sb), &dealloc);
7162         }
7163
7164 out:
7165         return ret;
7166 }
7167
7168 /*
7169  * Initialize security and acl for a already created inode.
7170  * Used for reflink a non-preserve-security file.
7171  *
7172  * It uses common api like ocfs2_xattr_set, so the caller
7173  * must not hold any lock expect i_mutex.
7174  */
7175 int ocfs2_init_security_and_acl(struct inode *dir,
7176                                 struct inode *inode)
7177 {
7178         int ret = 0;
7179         struct buffer_head *dir_bh = NULL;
7180         struct ocfs2_security_xattr_info si = {
7181                 .enable = 1,
7182         };
7183
7184         ret = ocfs2_init_security_get(inode, dir, &si);
7185         if (!ret) {
7186                 ret = ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY,
7187                                       si.name, si.value, si.value_len,
7188                                       XATTR_CREATE);
7189                 if (ret) {
7190                         mlog_errno(ret);
7191                         goto leave;
7192                 }
7193         } else if (ret != -EOPNOTSUPP) {
7194                 mlog_errno(ret);
7195                 goto leave;
7196         }
7197
7198         ret = ocfs2_inode_lock(dir, &dir_bh, 0);
7199         if (ret) {
7200                 mlog_errno(ret);
7201                 goto leave;
7202         }
7203
7204         ret = ocfs2_init_acl(NULL, inode, dir, NULL, dir_bh, NULL, NULL);
7205         if (ret)
7206                 mlog_errno(ret);
7207
7208         ocfs2_inode_unlock(dir, 0);
7209         brelse(dir_bh);
7210 leave:
7211         return ret;
7212 }
7213 /*
7214  * 'security' attributes support
7215  */
7216 static size_t ocfs2_xattr_security_list(struct dentry *dentry, char *list,
7217                                         size_t list_size, const char *name,
7218                                         size_t name_len, int type)
7219 {
7220         const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
7221         const size_t total_len = prefix_len + name_len + 1;
7222
7223         if (list && total_len <= list_size) {
7224                 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
7225                 memcpy(list + prefix_len, name, name_len);
7226                 list[prefix_len + name_len] = '\0';
7227         }
7228         return total_len;
7229 }
7230
7231 static int ocfs2_xattr_security_get(struct dentry *dentry, const char *name,
7232                                     void *buffer, size_t size, int type)
7233 {
7234         if (strcmp(name, "") == 0)
7235                 return -EINVAL;
7236         return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_SECURITY,
7237                                name, buffer, size);
7238 }
7239
7240 static int ocfs2_xattr_security_set(struct dentry *dentry, const char *name,
7241                 const void *value, size_t size, int flags, int type)
7242 {
7243         if (strcmp(name, "") == 0)
7244                 return -EINVAL;
7245
7246         return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_SECURITY,
7247                                name, value, size, flags);
7248 }
7249
7250 int ocfs2_init_security_get(struct inode *inode,
7251                             struct inode *dir,
7252                             struct ocfs2_security_xattr_info *si)
7253 {
7254         /* check whether ocfs2 support feature xattr */
7255         if (!ocfs2_supports_xattr(OCFS2_SB(dir->i_sb)))
7256                 return -EOPNOTSUPP;
7257         return security_inode_init_security(inode, dir, &si->name, &si->value,
7258                                             &si->value_len);
7259 }
7260
7261 int ocfs2_init_security_set(handle_t *handle,
7262                             struct inode *inode,
7263                             struct buffer_head *di_bh,
7264                             struct ocfs2_security_xattr_info *si,
7265                             struct ocfs2_alloc_context *xattr_ac,
7266                             struct ocfs2_alloc_context *data_ac)
7267 {
7268         return ocfs2_xattr_set_handle(handle, inode, di_bh,
7269                                      OCFS2_XATTR_INDEX_SECURITY,
7270                                      si->name, si->value, si->value_len, 0,
7271                                      xattr_ac, data_ac);
7272 }
7273
7274 struct xattr_handler ocfs2_xattr_security_handler = {
7275         .prefix = XATTR_SECURITY_PREFIX,
7276         .list   = ocfs2_xattr_security_list,
7277         .get    = ocfs2_xattr_security_get,
7278         .set    = ocfs2_xattr_security_set,
7279 };
7280
7281 /*
7282  * 'trusted' attributes support
7283  */
7284 static size_t ocfs2_xattr_trusted_list(struct dentry *dentry, char *list,
7285                                        size_t list_size, const char *name,
7286                                        size_t name_len, int type)
7287 {
7288         const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
7289         const size_t total_len = prefix_len + name_len + 1;
7290
7291         if (list && total_len <= list_size) {
7292                 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
7293                 memcpy(list + prefix_len, name, name_len);
7294                 list[prefix_len + name_len] = '\0';
7295         }
7296         return total_len;
7297 }
7298
7299 static int ocfs2_xattr_trusted_get(struct dentry *dentry, const char *name,
7300                 void *buffer, size_t size, int type)
7301 {
7302         if (strcmp(name, "") == 0)
7303                 return -EINVAL;
7304         return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_TRUSTED,
7305                                name, buffer, size);
7306 }
7307
7308 static int ocfs2_xattr_trusted_set(struct dentry *dentry, const char *name,
7309                 const void *value, size_t size, int flags, int type)
7310 {
7311         if (strcmp(name, "") == 0)
7312                 return -EINVAL;
7313
7314         return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_TRUSTED,
7315                                name, value, size, flags);
7316 }
7317
7318 struct xattr_handler ocfs2_xattr_trusted_handler = {
7319         .prefix = XATTR_TRUSTED_PREFIX,
7320         .list   = ocfs2_xattr_trusted_list,
7321         .get    = ocfs2_xattr_trusted_get,
7322         .set    = ocfs2_xattr_trusted_set,
7323 };
7324
7325 /*
7326  * 'user' attributes support
7327  */
7328 static size_t ocfs2_xattr_user_list(struct dentry *dentry, char *list,
7329                                     size_t list_size, const char *name,
7330                                     size_t name_len, int type)
7331 {
7332         const size_t prefix_len = XATTR_USER_PREFIX_LEN;
7333         const size_t total_len = prefix_len + name_len + 1;
7334         struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7335
7336         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7337                 return 0;
7338
7339         if (list && total_len <= list_size) {
7340                 memcpy(list, XATTR_USER_PREFIX, prefix_len);
7341                 memcpy(list + prefix_len, name, name_len);
7342                 list[prefix_len + name_len] = '\0';
7343         }
7344         return total_len;
7345 }
7346
7347 static int ocfs2_xattr_user_get(struct dentry *dentry, const char *name,
7348                 void *buffer, size_t size, int type)
7349 {
7350         struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7351
7352         if (strcmp(name, "") == 0)
7353                 return -EINVAL;
7354         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7355                 return -EOPNOTSUPP;
7356         return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_USER, name,
7357                                buffer, size);
7358 }
7359
7360 static int ocfs2_xattr_user_set(struct dentry *dentry, const char *name,
7361                 const void *value, size_t size, int flags, int type)
7362 {
7363         struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7364
7365         if (strcmp(name, "") == 0)
7366                 return -EINVAL;
7367         if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7368                 return -EOPNOTSUPP;
7369
7370         return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_USER,
7371                                name, value, size, flags);
7372 }
7373
7374 struct xattr_handler ocfs2_xattr_user_handler = {
7375         .prefix = XATTR_USER_PREFIX,
7376         .list   = ocfs2_xattr_user_list,
7377         .get    = ocfs2_xattr_user_get,
7378         .set    = ocfs2_xattr_user_set,
7379 };