fs/ocfs2/dir.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * dir.c
   5  *
   6  * Creates, reads, walks and deletes directory-nodes
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  *  Portions of this code from linux/fs/ext3/dir.c
  11  *
  12  *  Copyright (C) 1992, 1993, 1994, 1995
  13  *  Remy Card (card@masi.ibp.fr)
  14  *  Laboratoire MASI - Institut Blaise pascal
  15  *  Universite Pierre et Marie Curie (Paris VI)
  16  *
  17  *   from
  18  *
  19  *   linux/fs/minix/dir.c
  20  *
  21  *   Copyright (C) 1991, 1992 Linux Torvalds
  22  *
  23  * This program is free software; you can redistribute it and/or
  24  * modify it under the terms of the GNU General Public
  25  * License as published by the Free Software Foundation; either
  26  * version 2 of the License, or (at your option) any later version.
  27  *
  28  * This program is distributed in the hope that it will be useful,
  29  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  30  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  31  * General Public License for more details.
  32  *
  33  * You should have received a copy of the GNU General Public
  34  * License along with this program; if not, write to the
  35  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  36  * Boston, MA 021110-1307, USA.
  37  */
  38
  39 #include <linux/fs.h>
  40 #include <linux/types.h>
  41 #include <linux/slab.h>
  42 #include <linux/highmem.h>
  43 #include <linux/quotaops.h>
  44 #include <linux/sort.h>
  45
  46 #define MLOG_MASK_PREFIX ML_NAMEI
  47 #include <cluster/masklog.h>
  48
  49 #include "ocfs2.h"
  50
  51 #include "alloc.h"
  52 #include "blockcheck.h"
  53 #include "dir.h"
  54 #include "dlmglue.h"
  55 #include "extent_map.h"
  56 #include "file.h"
  57 #include "inode.h"
  58 #include "journal.h"
  59 #include "namei.h"
  60 #include "suballoc.h"
  61 #include "super.h"
  62 #include "sysfile.h"
  63 #include "uptodate.h"
  64
  65 #include "buffer_head_io.h"
  66
  67 #define NAMEI_RA_CHUNKS  2
  68 #define NAMEI_RA_BLOCKS  4
  69 #define NAMEI_RA_SIZE        (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
  70 #define NAMEI_RA_INDEX(c,b)  (((c) * NAMEI_RA_BLOCKS) + (b))
  71
  72 static unsigned char ocfs2_filetype_table[] = {
  73         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
  74 };
  75
  76 static int ocfs2_do_extend_dir(struct super_block *sb,
  77                                handle_t *handle,
  78                                struct inode *dir,
  79                                struct buffer_head *parent_fe_bh,
  80                                struct ocfs2_alloc_context *data_ac,
  81                                struct ocfs2_alloc_context *meta_ac,
  82                                struct buffer_head **new_bh);
  83 static int ocfs2_dir_indexed(struct inode *inode);
  84
  85 /*
  86  * These are distinct checks because future versions of the file system will
  87  * want to have a trailing dirent structure independent of indexing.
  88  */
  89 static int ocfs2_supports_dir_trailer(struct inode *dir)
  90 {
  91         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
  92
  93         if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
  94                 return 0;
  95
  96         return ocfs2_meta_ecc(osb) || ocfs2_dir_indexed(dir);
  97 }
  98
  99 /*
 100  * "new' here refers to the point at which we're creating a new
 101  * directory via "mkdir()", but also when we're expanding an inline
 102  * directory. In either case, we don't yet have the indexing bit set
 103  * on the directory, so the standard checks will fail in when metaecc
 104  * is turned off. Only directory-initialization type functions should
 105  * use this then. Everything else wants ocfs2_supports_dir_trailer()
 106  */
 107 static int ocfs2_new_dir_wants_trailer(struct inode *dir)
 108 {
 109         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 110
 111         return ocfs2_meta_ecc(osb) ||
 112                 ocfs2_supports_indexed_dirs(osb);
 113 }
 114
 115 static inline unsigned int ocfs2_dir_trailer_blk_off(struct super_block *sb)
 116 {
 117         return sb->s_blocksize - sizeof(struct ocfs2_dir_block_trailer);
 118 }
 119
 120 #define ocfs2_trailer_from_bh(_bh, _sb) ((struct ocfs2_dir_block_trailer *) ((_bh)->b_data + ocfs2_dir_trailer_blk_off((_sb))))
 121
 122 /* XXX ocfs2_block_dqtrailer() is similar but not quite - can we make
 123  * them more consistent? */
 124 struct ocfs2_dir_block_trailer *ocfs2_dir_trailer_from_size(int blocksize,
 125                                                             void *data)
 126 {
 127         char *p = data;
 128
 129         p += blocksize - sizeof(struct ocfs2_dir_block_trailer);
 130         return (struct ocfs2_dir_block_trailer *)p;
 131 }
 132
 133 /*
 134  * XXX: This is executed once on every dirent. We should consider optimizing
 135  * it.
 136  */
 137 static int ocfs2_skip_dir_trailer(struct inode *dir,
 138                                   struct ocfs2_dir_entry *de,
 139                                   unsigned long offset,
 140                                   unsigned long blklen)
 141 {
 142         unsigned long toff = blklen - sizeof(struct ocfs2_dir_block_trailer);
 143
 144         if (!ocfs2_supports_dir_trailer(dir))
 145                 return 0;
 146
 147         if (offset != toff)
 148                 return 0;
 149
 150         return 1;
 151 }
 152
 153 static void ocfs2_init_dir_trailer(struct inode *inode,
 154                                    struct buffer_head *bh, u16 rec_len)
 155 {
 156         struct ocfs2_dir_block_trailer *trailer;
 157
 158         trailer = ocfs2_trailer_from_bh(bh, inode->i_sb);
 159         strcpy(trailer->db_signature, OCFS2_DIR_TRAILER_SIGNATURE);
 160         trailer->db_compat_rec_len =
 161                         cpu_to_le16(sizeof(struct ocfs2_dir_block_trailer));
 162         trailer->db_parent_dinode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
 163         trailer->db_blkno = cpu_to_le64(bh->b_blocknr);
 164         trailer->db_free_rec_len = cpu_to_le16(rec_len);
 165 }
 166 /*
 167  * Link an unindexed block with a dir trailer structure into the index free
 168  * list. This function will modify dirdata_bh, but assumes you've already
 169  * passed it to the journal.
 170  */
 171 static int ocfs2_dx_dir_link_trailer(struct inode *dir, handle_t *handle,
 172                                      struct buffer_head *dx_root_bh,
 173                                      struct buffer_head *dirdata_bh)
 174 {
 175         int ret;
 176         struct ocfs2_dx_root_block *dx_root;
 177         struct ocfs2_dir_block_trailer *trailer;
 178
 179         ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
 180                                       OCFS2_JOURNAL_ACCESS_WRITE);
 181         if (ret) {
 182                 mlog_errno(ret);
 183                 goto out;
 184         }
 185         trailer = ocfs2_trailer_from_bh(dirdata_bh, dir->i_sb);
 186         dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
 187
 188         trailer->db_free_next = dx_root->dr_free_blk;
 189         dx_root->dr_free_blk = cpu_to_le64(dirdata_bh->b_blocknr);
 190
 191         ocfs2_journal_dirty(handle, dx_root_bh);
 192
 193 out:
 194         return ret;
 195 }
 196
 197 static int ocfs2_free_list_at_root(struct ocfs2_dir_lookup_result *res)
 198 {
 199         return res->dl_prev_leaf_bh == NULL;
 200 }
 201
 202 void ocfs2_free_dir_lookup_result(struct ocfs2_dir_lookup_result *res)
 203 {
 204         brelse(res->dl_dx_root_bh);
 205         brelse(res->dl_leaf_bh);
 206         brelse(res->dl_dx_leaf_bh);
 207         brelse(res->dl_prev_leaf_bh);
 208 }
 209
 210 static int ocfs2_dir_indexed(struct inode *inode)
 211 {
 212         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INDEXED_DIR_FL)
 213                 return 1;
 214         return 0;
 215 }
 216
 217 static inline int ocfs2_dx_root_inline(struct ocfs2_dx_root_block *dx_root)
 218 {
 219         return dx_root->dr_flags & OCFS2_DX_FLAG_INLINE;
 220 }
 221
 222 /*
 223  * Hashing code adapted from ext3
 224  */
 225 #define DELTA 0x9E3779B9
 226
 227 static void TEA_transform(__u32 buf[4], __u32 const in[])
 228 {
 229         __u32   sum = 0;
 230         __u32   b0 = buf[0], b1 = buf[1];
 231         __u32   a = in[0], b = in[1], c = in[2], d = in[3];
 232         int     n = 16;
 233
 234         do {
 235                 sum += DELTA;
 236                 b0 += ((b1 << 4)+a) ^ (b1+sum) ^ ((b1 >> 5)+b);
 237                 b1 += ((b0 << 4)+c) ^ (b0+sum) ^ ((b0 >> 5)+d);
 238         } while (--n);
 239
 240         buf[0] += b0;
 241         buf[1] += b1;
 242 }
 243
 244 static void str2hashbuf(const char *msg, int len, __u32 *buf, int num)
 245 {
 246         __u32   pad, val;
 247         int     i;
 248
 249         pad = (__u32)len | ((__u32)len << 8);
 250         pad |= pad << 16;
 251
 252         val = pad;
 253         if (len > num*4)
 254                 len = num * 4;
 255         for (i = 0; i < len; i++) {
 256                 if ((i % 4) == 0)
 257                         val = pad;
 258                 val = msg[i] + (val << 8);
 259                 if ((i % 4) == 3) {
 260                         *buf++ = val;
 261                         val = pad;
 262                         num--;
 263                 }
 264         }
 265         if (--num >= 0)
 266                 *buf++ = val;
 267         while (--num >= 0)
 268                 *buf++ = pad;
 269 }
 270
 271 static void ocfs2_dx_dir_name_hash(struct inode *dir, const char *name, int len,
 272                                    struct ocfs2_dx_hinfo *hinfo)
 273 {
 274         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 275         const char      *p;
 276         __u32           in[8], buf[4];
 277
 278         /*
 279          * XXX: Is this really necessary, if the index is never looked
 280          * at by readdir? Is a hash value of '0' a bad idea?
 281          */
 282         if ((len == 1 && !strncmp(".", name, 1)) ||
 283             (len == 2 && !strncmp("..", name, 2))) {
 284                 buf[0] = buf[1] = 0;
 285                 goto out;
 286         }
 287
 288 #ifdef OCFS2_DEBUG_DX_DIRS
 289         /*
 290          * This makes it very easy to debug indexing problems. We
 291          * should never allow this to be selected without hand editing
 292          * this file though.
 293          */
 294         buf[0] = buf[1] = len;
 295         goto out;
 296 #endif
 297
 298         memcpy(buf, osb->osb_dx_seed, sizeof(buf));
 299
 300         p = name;
 301         while (len > 0) {
 302                 str2hashbuf(p, len, in, 4);
 303                 TEA_transform(buf, in);
 304                 len -= 16;
 305                 p += 16;
 306         }
 307
 308 out:
 309         hinfo->major_hash = buf[0];
 310         hinfo->minor_hash = buf[1];
 311 }
 312
 313 /*
 314  * bh passed here can be an inode block or a dir data block, depending
 315  * on the inode inline data flag.
 316  */
 317 static int ocfs2_check_dir_entry(struct inode * dir,
 318                                  struct ocfs2_dir_entry * de,
 319                                  struct buffer_head * bh,
 320                                  unsigned long offset)
 321 {
 322         const char *error_msg = NULL;
 323         const int rlen = le16_to_cpu(de->rec_len);
 324
 325         if (rlen < OCFS2_DIR_REC_LEN(1))
 326                 error_msg = "rec_len is smaller than minimal";
 327         else if (rlen % 4 != 0)
 328                 error_msg = "rec_len % 4 != 0";
 329         else if (rlen < OCFS2_DIR_REC_LEN(de->name_len))
 330                 error_msg = "rec_len is too small for name_len";
 331         else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
 332                 error_msg = "directory entry across blocks";
 333
 334         if (error_msg != NULL)
 335                 mlog(ML_ERROR, "bad entry in directory #%llu: %s - "
 336                      "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n",
 337                      (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg,
 338                      offset, (unsigned long long)le64_to_cpu(de->inode), rlen,
 339                      de->name_len);
 340         return error_msg == NULL ? 1 : 0;
 341 }
 342
 343 static inline int ocfs2_match(int len,
 344                               const char * const name,
 345                               struct ocfs2_dir_entry *de)
 346 {
 347         if (len != de->name_len)
 348                 return 0;
 349         if (!de->inode)
 350                 return 0;
 351         return !memcmp(name, de->name, len);
 352 }
 353
 354 /*
 355  * Returns 0 if not found, -1 on failure, and 1 on success
 356  */
 357 static int inline ocfs2_search_dirblock(struct buffer_head *bh,
 358                                         struct inode *dir,
 359                                         const char *name, int namelen,
 360                                         unsigned long offset,
 361                                         char *first_de,
 362                                         unsigned int bytes,
 363                                         struct ocfs2_dir_entry **res_dir)
 364 {
 365         struct ocfs2_dir_entry *de;
 366         char *dlimit, *de_buf;
 367         int de_len;
 368         int ret = 0;
 369
 370         mlog_entry_void();
 371
 372         de_buf = first_de;
 373         dlimit = de_buf + bytes;
 374
 375         while (de_buf < dlimit) {
 376                 /* this code is executed quadratically often */
 377                 /* do minimal checking `by hand' */
 378
 379                 de = (struct ocfs2_dir_entry *) de_buf;
 380
 381                 if (de_buf + namelen <= dlimit &&
 382                     ocfs2_match(namelen, name, de)) {
 383                         /* found a match - just to be sure, do a full check */
 384                         if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
 385                                 ret = -1;
 386                                 goto bail;
 387                         }
 388                         *res_dir = de;
 389                         ret = 1;
 390                         goto bail;
 391                 }
 392
 393                 /* prevent looping on a bad block */
 394                 de_len = le16_to_cpu(de->rec_len);
 395                 if (de_len <= 0) {
 396                         ret = -1;
 397                         goto bail;
 398                 }
 399
 400                 de_buf += de_len;
 401                 offset += de_len;
 402         }
 403
 404 bail:
 405         mlog_exit(ret);
 406         return ret;
 407 }
 408
 409 static struct buffer_head *ocfs2_find_entry_id(const char *name,
 410                                                int namelen,
 411                                                struct inode *dir,
 412                                                struct ocfs2_dir_entry **res_dir)
 413 {
 414         int ret, found;
 415         struct buffer_head *di_bh = NULL;
 416         struct ocfs2_dinode *di;
 417         struct ocfs2_inline_data *data;
 418
 419         ret = ocfs2_read_inode_block(dir, &di_bh);
 420         if (ret) {
 421                 mlog_errno(ret);
 422                 goto out;
 423         }
 424
 425         di = (struct ocfs2_dinode *)di_bh->b_data;
 426         data = &di->id2.i_data;
 427
 428         found = ocfs2_search_dirblock(di_bh, dir, name, namelen, 0,
 429                                       data->id_data, i_size_read(dir), res_dir);
 430         if (found == 1)
 431                 return di_bh;
 432
 433         brelse(di_bh);
 434 out:
 435         return NULL;
 436 }
 437
 438 static int ocfs2_validate_dir_block(struct super_block *sb,
 439                                     struct buffer_head *bh)
 440 {
 441         int rc;
 442         struct ocfs2_dir_block_trailer *trailer =
 443                 ocfs2_trailer_from_bh(bh, sb);
 444
 445
 446         /*
 447          * We don't validate dirents here, that's handled
 448          * in-place when the code walks them.
 449          */
 450         mlog(0, "Validating dirblock %llu\n",
 451              (unsigned long long)bh->b_blocknr);
 452
 453         BUG_ON(!buffer_uptodate(bh));
 454
 455         /*
 456          * If the ecc fails, we return the error but otherwise
 457          * leave the filesystem running.  We know any error is
 458          * local to this block.
 459          *
 460          * Note that we are safe to call this even if the directory
 461          * doesn't have a trailer.  Filesystems without metaecc will do
 462          * nothing, and filesystems with it will have one.
 463          */
 464         rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &trailer->db_check);
 465         if (rc)
 466                 mlog(ML_ERROR, "Checksum failed for dinode %llu\n",
 467                      (unsigned long long)bh->b_blocknr);
 468
 469         return rc;
 470 }
 471
 472 /*
 473  * Validate a directory trailer.
 474  *
 475  * We check the trailer here rather than in ocfs2_validate_dir_block()
 476  * because that function doesn't have the inode to test.
 477  */
 478 static int ocfs2_check_dir_trailer(struct inode *dir, struct buffer_head *bh)
 479 {
 480         int rc = 0;
 481         struct ocfs2_dir_block_trailer *trailer;
 482
 483         trailer = ocfs2_trailer_from_bh(bh, dir->i_sb);
 484         if (!OCFS2_IS_VALID_DIR_TRAILER(trailer)) {
 485                 rc = -EINVAL;
 486                 ocfs2_error(dir->i_sb,
 487                             "Invalid dirblock #%llu: "
 488                             "signature = %.*s\n",
 489                             (unsigned long long)bh->b_blocknr, 7,
 490                             trailer->db_signature);
 491                 goto out;
 492         }
 493         if (le64_to_cpu(trailer->db_blkno) != bh->b_blocknr) {
 494                 rc = -EINVAL;
 495                 ocfs2_error(dir->i_sb,
 496                             "Directory block #%llu has an invalid "
 497                             "db_blkno of %llu",
 498                             (unsigned long long)bh->b_blocknr,
 499                             (unsigned long long)le64_to_cpu(trailer->db_blkno));
 500                 goto out;
 501         }
 502         if (le64_to_cpu(trailer->db_parent_dinode) !=
 503             OCFS2_I(dir)->ip_blkno) {
 504                 rc = -EINVAL;
 505                 ocfs2_error(dir->i_sb,
 506                             "Directory block #%llu on dinode "
 507                             "#%llu has an invalid parent_dinode "
 508                             "of %llu",
 509                             (unsigned long long)bh->b_blocknr,
 510                             (unsigned long long)OCFS2_I(dir)->ip_blkno,
 511                             (unsigned long long)le64_to_cpu(trailer->db_blkno));
 512                 goto out;
 513         }
 514 out:
 515         return rc;
 516 }
 517
 518 /*
 519  * This function forces all errors to -EIO for consistency with its
 520  * predecessor, ocfs2_bread().  We haven't audited what returning the
 521  * real error codes would do to callers.  We log the real codes with
 522  * mlog_errno() before we squash them.
 523  */
 524 static int ocfs2_read_dir_block(struct inode *inode, u64 v_block,
 525                                 struct buffer_head **bh, int flags)
 526 {
 527         int rc = 0;
 528         struct buffer_head *tmp = *bh;
 529
 530         rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, flags,
 531                                     ocfs2_validate_dir_block);
 532         if (rc) {
 533                 mlog_errno(rc);
 534                 goto out;
 535         }
 536
 537         if (!(flags & OCFS2_BH_READAHEAD) &&
 538             ocfs2_supports_dir_trailer(inode)) {
 539                 rc = ocfs2_check_dir_trailer(inode, tmp);
 540                 if (rc) {
 541                         if (!*bh)
 542                                 brelse(tmp);
 543                         mlog_errno(rc);
 544                         goto out;
 545                 }
 546         }
 547
 548         /* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
 549         if (!*bh)
 550                 *bh = tmp;
 551
 552 out:
 553         return rc ? -EIO : 0;
 554 }
 555
 556 /*
 557  * Read the block at 'phys' which belongs to this directory
 558  * inode. This function does no virtual->physical block translation -
 559  * what's passed in is assumed to be a valid directory block.
 560  */
 561 static int ocfs2_read_dir_block_direct(struct inode *dir, u64 phys,
 562                                        struct buffer_head **bh)
 563 {
 564         int ret;
 565         struct buffer_head *tmp = *bh;
 566
 567         ret = ocfs2_read_block(INODE_CACHE(dir), phys, &tmp,
 568                                ocfs2_validate_dir_block);
 569         if (ret) {
 570                 mlog_errno(ret);
 571                 goto out;
 572         }
 573
 574         if (ocfs2_supports_dir_trailer(dir)) {
 575                 ret = ocfs2_check_dir_trailer(dir, tmp);
 576                 if (ret) {
 577                         if (!*bh)
 578                                 brelse(tmp);
 579                         mlog_errno(ret);
 580                         goto out;
 581                 }
 582         }
 583
 584         if (!ret && !*bh)
 585                 *bh = tmp;
 586 out:
 587         return ret;
 588 }
 589
 590 static int ocfs2_validate_dx_root(struct super_block *sb,
 591                                   struct buffer_head *bh)
 592 {
 593         int ret;
 594         struct ocfs2_dx_root_block *dx_root;
 595
 596         BUG_ON(!buffer_uptodate(bh));
 597
 598         dx_root = (struct ocfs2_dx_root_block *) bh->b_data;
 599
 600         ret = ocfs2_validate_meta_ecc(sb, bh->b_data, &dx_root->dr_check);
 601         if (ret) {
 602                 mlog(ML_ERROR,
 603                      "Checksum failed for dir index root block %llu\n",
 604                      (unsigned long long)bh->b_blocknr);
 605                 return ret;
 606         }
 607
 608         if (!OCFS2_IS_VALID_DX_ROOT(dx_root)) {
 609                 ocfs2_error(sb,
 610                             "Dir Index Root # %llu has bad signature %.*s",
 611                             (unsigned long long)le64_to_cpu(dx_root->dr_blkno),
 612                             7, dx_root->dr_signature);
 613                 return -EINVAL;
 614         }
 615
 616         return 0;
 617 }
 618
 619 static int ocfs2_read_dx_root(struct inode *dir, struct ocfs2_dinode *di,
 620                               struct buffer_head **dx_root_bh)
 621 {
 622         int ret;
 623         u64 blkno = le64_to_cpu(di->i_dx_root);
 624         struct buffer_head *tmp = *dx_root_bh;
 625
 626         ret = ocfs2_read_block(INODE_CACHE(dir), blkno, &tmp,
 627                                ocfs2_validate_dx_root);
 628
 629         /* If ocfs2_read_block() got us a new bh, pass it up. */
 630         if (!ret && !*dx_root_bh)
 631                 *dx_root_bh = tmp;
 632
 633         return ret;
 634 }
 635
 636 static int ocfs2_validate_dx_leaf(struct super_block *sb,
 637                                   struct buffer_head *bh)
 638 {
 639         int ret;
 640         struct ocfs2_dx_leaf *dx_leaf = (struct ocfs2_dx_leaf *)bh->b_data;
 641
 642         BUG_ON(!buffer_uptodate(bh));
 643
 644         ret = ocfs2_validate_meta_ecc(sb, bh->b_data, &dx_leaf->dl_check);
 645         if (ret) {
 646                 mlog(ML_ERROR,
 647                      "Checksum failed for dir index leaf block %llu\n",
 648                      (unsigned long long)bh->b_blocknr);
 649                 return ret;
 650         }
 651
 652         if (!OCFS2_IS_VALID_DX_LEAF(dx_leaf)) {
 653                 ocfs2_error(sb, "Dir Index Leaf has bad signature %.*s",
 654                             7, dx_leaf->dl_signature);
 655                 return -EROFS;
 656         }
 657
 658         return 0;
 659 }
 660
 661 static int ocfs2_read_dx_leaf(struct inode *dir, u64 blkno,
 662                               struct buffer_head **dx_leaf_bh)
 663 {
 664         int ret;
 665         struct buffer_head *tmp = *dx_leaf_bh;
 666
 667         ret = ocfs2_read_block(INODE_CACHE(dir), blkno, &tmp,
 668                                ocfs2_validate_dx_leaf);
 669
 670         /* If ocfs2_read_block() got us a new bh, pass it up. */
 671         if (!ret && !*dx_leaf_bh)
 672                 *dx_leaf_bh = tmp;
 673
 674         return ret;
 675 }
 676
 677 /*
 678  * Read a series of dx_leaf blocks. This expects all buffer_head
 679  * pointers to be NULL on function entry.
 680  */
 681 static int ocfs2_read_dx_leaves(struct inode *dir, u64 start, int num,
 682                                 struct buffer_head **dx_leaf_bhs)
 683 {
 684         int ret;
 685
 686         ret = ocfs2_read_blocks(INODE_CACHE(dir), start, num, dx_leaf_bhs, 0,
 687                                 ocfs2_validate_dx_leaf);
 688         if (ret)
 689                 mlog_errno(ret);
 690
 691         return ret;
 692 }
 693
 694 static struct buffer_head *ocfs2_find_entry_el(const char *name, int namelen,
 695                                                struct inode *dir,
 696                                                struct ocfs2_dir_entry **res_dir)
 697 {
 698         struct super_block *sb;
 699         struct buffer_head *bh_use[NAMEI_RA_SIZE];
 700         struct buffer_head *bh, *ret = NULL;
 701         unsigned long start, block, b;
 702         int ra_max = 0;         /* Number of bh's in the readahead
 703                                    buffer, bh_use[] */
 704         int ra_ptr = 0;         /* Current index into readahead
 705                                    buffer */
 706         int num = 0;
 707         int nblocks, i, err;
 708
 709         mlog_entry_void();
 710
 711         sb = dir->i_sb;
 712
 713         nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
 714         start = OCFS2_I(dir)->ip_dir_start_lookup;
 715         if (start >= nblocks)
 716                 start = 0;
 717         block = start;
 718
 719 restart:
 720         do {
 721                 /*
 722                  * We deal with the read-ahead logic here.
 723                  */
 724                 if (ra_ptr >= ra_max) {
 725                         /* Refill the readahead buffer */
 726                         ra_ptr = 0;
 727                         b = block;
 728                         for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
 729                                 /*
 730                                  * Terminate if we reach the end of the
 731                                  * directory and must wrap, or if our
 732                                  * search has finished at this block.
 733                                  */
 734                                 if (b >= nblocks || (num && block == start)) {
 735                                         bh_use[ra_max] = NULL;
 736                                         break;
 737                                 }
 738                                 num++;
 739
 740                                 bh = NULL;
 741                                 err = ocfs2_read_dir_block(dir, b++, &bh,
 742                                                            OCFS2_BH_READAHEAD);
 743                                 bh_use[ra_max] = bh;
 744                         }
 745                 }
 746                 if ((bh = bh_use[ra_ptr++]) == NULL)
 747                         goto next;
 748                 if (ocfs2_read_dir_block(dir, block, &bh, 0)) {
 749                         /* read error, skip block & hope for the best.
 750                          * ocfs2_read_dir_block() has released the bh. */
 751                         ocfs2_error(dir->i_sb, "reading directory %llu, "
 752                                     "offset %lu\n",
 753                                     (unsigned long long)OCFS2_I(dir)->ip_blkno,
 754                                     block);
 755                         goto next;
 756                 }
 757                 i = ocfs2_search_dirblock(bh, dir, name, namelen,
 758                                           block << sb->s_blocksize_bits,
 759                                           bh->b_data, sb->s_blocksize,
 760                                           res_dir);
 761                 if (i == 1) {
 762                         OCFS2_I(dir)->ip_dir_start_lookup = block;
 763                         ret = bh;
 764                         goto cleanup_and_exit;
 765                 } else {
 766                         brelse(bh);
 767                         if (i < 0)
 768                                 goto cleanup_and_exit;
 769                 }
 770         next:
 771                 if (++block >= nblocks)
 772                         block = 0;
 773         } while (block != start);
 774
 775         /*
 776          * If the directory has grown while we were searching, then
 777          * search the last part of the directory before giving up.
 778          */
 779         block = nblocks;
 780         nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
 781         if (block < nblocks) {
 782                 start = 0;
 783                 goto restart;
 784         }
 785
 786 cleanup_and_exit:
 787         /* Clean up the read-ahead blocks */
 788         for (; ra_ptr < ra_max; ra_ptr++)
 789                 brelse(bh_use[ra_ptr]);
 790
 791         mlog_exit_ptr(ret);
 792         return ret;
 793 }
 794
 795 static int ocfs2_dx_dir_lookup_rec(struct inode *inode,
 796                                    struct ocfs2_extent_list *el,
 797                                    u32 major_hash,
 798                                    u32 *ret_cpos,
 799                                    u64 *ret_phys_blkno,
 800                                    unsigned int *ret_clen)
 801 {
 802         int ret = 0, i, found;
 803         struct buffer_head *eb_bh = NULL;
 804         struct ocfs2_extent_block *eb;
 805         struct ocfs2_extent_rec *rec = NULL;
 806
 807         if (el->l_tree_depth) {
 808                 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, major_hash,
 809                                       &eb_bh);
 810                 if (ret) {
 811                         mlog_errno(ret);
 812                         goto out;
 813                 }
 814
 815                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
 816                 el = &eb->h_list;
 817
 818                 if (el->l_tree_depth) {
 819                         ocfs2_error(inode->i_sb,
 820                                     "Inode %lu has non zero tree depth in "
 821                                     "btree tree block %llu\n", inode->i_ino,
 822                                     (unsigned long long)eb_bh->b_blocknr);
 823                         ret = -EROFS;
 824                         goto out;
 825                 }
 826         }
 827
 828         found = 0;
 829         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
 830                 rec = &el->l_recs[i];
 831
 832                 if (le32_to_cpu(rec->e_cpos) <= major_hash) {
 833                         found = 1;
 834                         break;
 835                 }
 836         }
 837
 838         if (!found) {
 839                 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
 840                             "record (%u, %u, 0) in btree", inode->i_ino,
 841                             le32_to_cpu(rec->e_cpos),
 842                             ocfs2_rec_clusters(el, rec));
 843                 ret = -EROFS;
 844                 goto out;
 845         }
 846
 847         if (ret_phys_blkno)
 848                 *ret_phys_blkno = le64_to_cpu(rec->e_blkno);
 849         if (ret_cpos)
 850                 *ret_cpos = le32_to_cpu(rec->e_cpos);
 851         if (ret_clen)
 852                 *ret_clen = le16_to_cpu(rec->e_leaf_clusters);
 853
 854 out:
 855         brelse(eb_bh);
 856         return ret;
 857 }
 858
 859 /*
 860  * Returns the block index, from the start of the cluster which this
 861  * hash belongs too.
 862  */
 863 static inline unsigned int __ocfs2_dx_dir_hash_idx(struct ocfs2_super *osb,
 864                                                    u32 minor_hash)
 865 {
 866         return minor_hash & osb->osb_dx_mask;
 867 }
 868
 869 static inline unsigned int ocfs2_dx_dir_hash_idx(struct ocfs2_super *osb,
 870                                           struct ocfs2_dx_hinfo *hinfo)
 871 {
 872         return __ocfs2_dx_dir_hash_idx(osb, hinfo->minor_hash);
 873 }
 874
 875 static int ocfs2_dx_dir_lookup(struct inode *inode,
 876                                struct ocfs2_extent_list *el,
 877                                struct ocfs2_dx_hinfo *hinfo,
 878                                u32 *ret_cpos,
 879                                u64 *ret_phys_blkno)
 880 {
 881         int ret = 0;
 882         unsigned int cend, uninitialized_var(clen);
 883         u32 uninitialized_var(cpos);
 884         u64 uninitialized_var(blkno);
 885         u32 name_hash = hinfo->major_hash;
 886
 887         ret = ocfs2_dx_dir_lookup_rec(inode, el, name_hash, &cpos, &blkno,
 888                                       &clen);
 889         if (ret) {
 890                 mlog_errno(ret);
 891                 goto out;
 892         }
 893
 894         cend = cpos + clen;
 895         if (name_hash >= cend) {
 896                 /* We want the last cluster */
 897                 blkno += ocfs2_clusters_to_blocks(inode->i_sb, clen - 1);
 898                 cpos += clen - 1;
 899         } else {
 900                 blkno += ocfs2_clusters_to_blocks(inode->i_sb,
 901                                                   name_hash - cpos);
 902                 cpos = name_hash;
 903         }
 904
 905         /*
 906          * We now have the cluster which should hold our entry. To
 907          * find the exact block from the start of the cluster to
 908          * search, we take the lower bits of the hash.
 909          */
 910         blkno += ocfs2_dx_dir_hash_idx(OCFS2_SB(inode->i_sb), hinfo);
 911
 912         if (ret_phys_blkno)
 913                 *ret_phys_blkno = blkno;
 914         if (ret_cpos)
 915                 *ret_cpos = cpos;
 916
 917 out:
 918
 919         return ret;
 920 }
 921
 922 static int ocfs2_dx_dir_search(const char *name, int namelen,
 923                                struct inode *dir,
 924                                struct ocfs2_dx_root_block *dx_root,
 925                                struct ocfs2_dir_lookup_result *res)
 926 {
 927         int ret, i, found;
 928         u64 uninitialized_var(phys);
 929         struct buffer_head *dx_leaf_bh = NULL;
 930         struct ocfs2_dx_leaf *dx_leaf;
 931         struct ocfs2_dx_entry *dx_entry = NULL;
 932         struct buffer_head *dir_ent_bh = NULL;
 933         struct ocfs2_dir_entry *dir_ent = NULL;
 934         struct ocfs2_dx_hinfo *hinfo = &res->dl_hinfo;
 935         struct ocfs2_extent_list *dr_el;
 936         struct ocfs2_dx_entry_list *entry_list;
 937
 938         ocfs2_dx_dir_name_hash(dir, name, namelen, &res->dl_hinfo);
 939
 940         if (ocfs2_dx_root_inline(dx_root)) {
 941                 entry_list = &dx_root->dr_entries;
 942                 goto search;
 943         }
 944
 945         dr_el = &dx_root->dr_list;
 946
 947         ret = ocfs2_dx_dir_lookup(dir, dr_el, hinfo, NULL, &phys);
 948         if (ret) {
 949                 mlog_errno(ret);
 950                 goto out;
 951         }
 952
 953         mlog(0, "Dir %llu: name: \"%.*s\", lookup of hash: %u.0x%x "
 954              "returns: %llu\n",
 955              (unsigned long long)OCFS2_I(dir)->ip_blkno,
 956              namelen, name, hinfo->major_hash, hinfo->minor_hash,
 957              (unsigned long long)phys);
 958
 959         ret = ocfs2_read_dx_leaf(dir, phys, &dx_leaf_bh);
 960         if (ret) {
 961                 mlog_errno(ret);
 962                 goto out;
 963         }
 964
 965         dx_leaf = (struct ocfs2_dx_leaf *) dx_leaf_bh->b_data;
 966
 967         mlog(0, "leaf info: num_used: %d, count: %d\n",
 968              le16_to_cpu(dx_leaf->dl_list.de_num_used),
 969              le16_to_cpu(dx_leaf->dl_list.de_count));
 970
 971         entry_list = &dx_leaf->dl_list;
 972
 973 search:
 974         /*
 975          * Empty leaf is legal, so no need to check for that.
 976          */
 977         found = 0;
 978         for (i = 0; i < le16_to_cpu(entry_list->de_num_used); i++) {
 979                 dx_entry = &entry_list->de_entries[i];
 980
 981                 if (hinfo->major_hash != le32_to_cpu(dx_entry->dx_major_hash)
 982                     || hinfo->minor_hash != le32_to_cpu(dx_entry->dx_minor_hash))
 983                         continue;
 984
 985                 /*
 986                  * Search unindexed leaf block now. We're not
 987                  * guaranteed to find anything.
 988                  */
 989                 ret = ocfs2_read_dir_block_direct(dir,
 990                                           le64_to_cpu(dx_entry->dx_dirent_blk),
 991                                           &dir_ent_bh);
 992                 if (ret) {
 993                         mlog_errno(ret);
 994                         goto out;
 995                 }
 996
 997                 /*
 998                  * XXX: We should check the unindexed block here,
 999                  * before using it.
1000                  */
1001
1002                 found = ocfs2_search_dirblock(dir_ent_bh, dir, name, namelen,
1003                                               0, dir_ent_bh->b_data,
1004                                               dir->i_sb->s_blocksize, &dir_ent);
1005                 if (found == 1)
1006                         break;
1007
1008                 if (found == -1) {
1009                         /* This means we found a bad directory entry. */
1010                         ret = -EIO;
1011                         mlog_errno(ret);
1012                         goto out;
1013                 }
1014
1015                 brelse(dir_ent_bh);
1016                 dir_ent_bh = NULL;
1017         }
1018
1019         if (found <= 0) {
1020                 ret = -ENOENT;
1021                 goto out;
1022         }
1023
1024         res->dl_leaf_bh = dir_ent_bh;
1025         res->dl_entry = dir_ent;
1026         res->dl_dx_leaf_bh = dx_leaf_bh;
1027         res->dl_dx_entry = dx_entry;
1028
1029         ret = 0;
1030 out:
1031         if (ret) {
1032                 brelse(dx_leaf_bh);
1033                 brelse(dir_ent_bh);
1034         }
1035         return ret;
1036 }
1037
1038 static int ocfs2_find_entry_dx(const char *name, int namelen,
1039                                struct inode *dir,
1040                                struct ocfs2_dir_lookup_result *lookup)
1041 {
1042         int ret;
1043         struct buffer_head *di_bh = NULL;
1044         struct ocfs2_dinode *di;
1045         struct buffer_head *dx_root_bh = NULL;
1046         struct ocfs2_dx_root_block *dx_root;
1047
1048         ret = ocfs2_read_inode_block(dir, &di_bh);
1049         if (ret) {
1050                 mlog_errno(ret);
1051                 goto out;
1052         }
1053
1054         di = (struct ocfs2_dinode *)di_bh->b_data;
1055
1056         ret = ocfs2_read_dx_root(dir, di, &dx_root_bh);
1057         if (ret) {
1058                 mlog_errno(ret);
1059                 goto out;
1060         }
1061         dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data;
1062
1063         ret = ocfs2_dx_dir_search(name, namelen, dir, dx_root, lookup);
1064         if (ret) {
1065                 if (ret != -ENOENT)
1066                         mlog_errno(ret);
1067                 goto out;
1068         }
1069
1070         lookup->dl_dx_root_bh = dx_root_bh;
1071         dx_root_bh = NULL;
1072 out:
1073         brelse(di_bh);
1074         brelse(dx_root_bh);
1075         return ret;
1076 }
1077
1078 /*
1079  * Try to find an entry of the provided name within 'dir'.
1080  *
1081  * If nothing was found, -ENOENT is returned. Otherwise, zero is
1082  * returned and the struct 'res' will contain information useful to
1083  * other directory manipulation functions.
1084  *
1085  * Caller can NOT assume anything about the contents of the
1086  * buffer_heads - they are passed back only so that it can be passed
1087  * into any one of the manipulation functions (add entry, delete
1088  * entry, etc). As an example, bh in the extent directory case is a
1089  * data block, in the inline-data case it actually points to an inode,
1090  * in the indexed directory case, multiple buffers are involved.
1091  */
1092 int ocfs2_find_entry(const char *name, int namelen,
1093                      struct inode *dir, struct ocfs2_dir_lookup_result *lookup)
1094 {
1095         struct buffer_head *bh;
1096         struct ocfs2_dir_entry *res_dir = NULL;
1097
1098         if (ocfs2_dir_indexed(dir))
1099                 return ocfs2_find_entry_dx(name, namelen, dir, lookup);
1100
1101         /*
1102          * The unindexed dir code only uses part of the lookup
1103          * structure, so there's no reason to push it down further
1104          * than this.
1105          */
1106         if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
1107                 bh = ocfs2_find_entry_id(name, namelen, dir, &res_dir);
1108         else
1109                 bh = ocfs2_find_entry_el(name, namelen, dir, &res_dir);
1110
1111         if (bh == NULL)
1112                 return -ENOENT;
1113
1114         lookup->dl_leaf_bh = bh;
1115         lookup->dl_entry = res_dir;
1116         return 0;
1117 }
1118
1119 /*
1120  * Update inode number and type of a previously found directory entry.
1121  */
1122 int ocfs2_update_entry(struct inode *dir, handle_t *handle,
1123                        struct ocfs2_dir_lookup_result *res,
1124                        struct inode *new_entry_inode)
1125 {
1126         int ret;
1127         ocfs2_journal_access_func access = ocfs2_journal_access_db;
1128         struct ocfs2_dir_entry *de = res->dl_entry;
1129         struct buffer_head *de_bh = res->dl_leaf_bh;
1130
1131         /*
1132          * The same code works fine for both inline-data and extent
1133          * based directories, so no need to split this up.  The only
1134          * difference is the journal_access function.
1135          */
1136
1137         if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
1138                 access = ocfs2_journal_access_di;
1139
1140         ret = access(handle, INODE_CACHE(dir), de_bh,
1141                      OCFS2_JOURNAL_ACCESS_WRITE);
1142         if (ret) {
1143                 mlog_errno(ret);
1144                 goto out;
1145         }
1146
1147         de->inode = cpu_to_le64(OCFS2_I(new_entry_inode)->ip_blkno);
1148         ocfs2_set_de_type(de, new_entry_inode->i_mode);
1149
1150         ocfs2_journal_dirty(handle, de_bh);
1151
1152 out:
1153         return ret;
1154 }
1155
1156 /*
1157  * __ocfs2_delete_entry deletes a directory entry by merging it with the
1158  * previous entry
1159  */
1160 static int __ocfs2_delete_entry(handle_t *handle, struct inode *dir,
1161                                 struct ocfs2_dir_entry *de_del,
1162                                 struct buffer_head *bh, char *first_de,
1163                                 unsigned int bytes)
1164 {
1165         struct ocfs2_dir_entry *de, *pde;
1166         int i, status = -ENOENT;
1167         ocfs2_journal_access_func access = ocfs2_journal_access_db;
1168
1169         mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
1170
1171         if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
1172                 access = ocfs2_journal_access_di;
1173
1174         i = 0;
1175         pde = NULL;
1176         de = (struct ocfs2_dir_entry *) first_de;
1177         while (i < bytes) {
1178                 if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
1179                         status = -EIO;
1180                         mlog_errno(status);
1181                         goto bail;
1182                 }
1183                 if (de == de_del)  {
1184                         status = access(handle, INODE_CACHE(dir), bh,
1185                                         OCFS2_JOURNAL_ACCESS_WRITE);
1186                         if (status < 0) {
1187                                 status = -EIO;
1188                                 mlog_errno(status);
1189                                 goto bail;
1190                         }
1191                         if (pde)
1192                                 le16_add_cpu(&pde->rec_len,
1193                                                 le16_to_cpu(de->rec_len));
1194                         else
1195                                 de->inode = 0;
1196                         dir->i_version++;
1197                         ocfs2_journal_dirty(handle, bh);
1198                         goto bail;
1199                 }
1200                 i += le16_to_cpu(de->rec_len);
1201                 pde = de;
1202                 de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
1203         }
1204 bail:
1205         mlog_exit(status);
1206         return status;
1207 }
1208
1209 static unsigned int ocfs2_figure_dirent_hole(struct ocfs2_dir_entry *de)
1210 {
1211         unsigned int hole;
1212
1213         if (le64_to_cpu(de->inode) == 0)
1214                 hole = le16_to_cpu(de->rec_len);
1215         else
1216                 hole = le16_to_cpu(de->rec_len) -
1217                         OCFS2_DIR_REC_LEN(de->name_len);
1218
1219         return hole;
1220 }
1221
1222 static int ocfs2_find_max_rec_len(struct super_block *sb,
1223                                   struct buffer_head *dirblock_bh)
1224 {
1225         int size, this_hole, largest_hole = 0;
1226         char *trailer, *de_buf, *limit, *start = dirblock_bh->b_data;
1227         struct ocfs2_dir_entry *de;
1228
1229         trailer = (char *)ocfs2_trailer_from_bh(dirblock_bh, sb);
1230         size = ocfs2_dir_trailer_blk_off(sb);
1231         limit = start + size;
1232         de_buf = start;
1233         de = (struct ocfs2_dir_entry *)de_buf;
1234         do {
1235                 if (de_buf != trailer) {
1236                         this_hole = ocfs2_figure_dirent_hole(de);
1237                         if (this_hole > largest_hole)
1238                                 largest_hole = this_hole;
1239                 }
1240
1241                 de_buf += le16_to_cpu(de->rec_len);
1242                 de = (struct ocfs2_dir_entry *)de_buf;
1243         } while (de_buf < limit);
1244
1245         if (largest_hole >= OCFS2_DIR_MIN_REC_LEN)
1246                 return largest_hole;
1247         return 0;
1248 }
1249
1250 static void ocfs2_dx_list_remove_entry(struct ocfs2_dx_entry_list *entry_list,
1251                                        int index)
1252 {
1253         int num_used = le16_to_cpu(entry_list->de_num_used);
1254
1255         if (num_used == 1 || index == (num_used - 1))
1256                 goto clear;
1257
1258         memmove(&entry_list->de_entries[index],
1259                 &entry_list->de_entries[index + 1],
1260                 (num_used - index - 1)*sizeof(struct ocfs2_dx_entry));
1261 clear:
1262         num_used--;
1263         memset(&entry_list->de_entries[num_used], 0,
1264                sizeof(struct ocfs2_dx_entry));
1265         entry_list->de_num_used = cpu_to_le16(num_used);
1266 }
1267
1268 static int ocfs2_delete_entry_dx(handle_t *handle, struct inode *dir,
1269                                  struct ocfs2_dir_lookup_result *lookup)
1270 {
1271         int ret, index, max_rec_len, add_to_free_list = 0;
1272         struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh;
1273         struct buffer_head *leaf_bh = lookup->dl_leaf_bh;
1274         struct ocfs2_dx_leaf *dx_leaf;
1275         struct ocfs2_dx_entry *dx_entry = lookup->dl_dx_entry;
1276         struct ocfs2_dir_block_trailer *trailer;
1277         struct ocfs2_dx_root_block *dx_root;
1278         struct ocfs2_dx_entry_list *entry_list;
1279
1280         /*
1281          * This function gets a bit messy because we might have to
1282          * modify the root block, regardless of whether the indexed
1283          * entries are stored inline.
1284          */
1285
1286         /*
1287          * *Only* set 'entry_list' here, based on where we're looking
1288          * for the indexed entries. Later, we might still want to
1289          * journal both blocks, based on free list state.
1290          */
1291         dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
1292         if (ocfs2_dx_root_inline(dx_root)) {
1293                 entry_list = &dx_root->dr_entries;
1294         } else {
1295                 dx_leaf = (struct ocfs2_dx_leaf *) lookup->dl_dx_leaf_bh->b_data;
1296                 entry_list = &dx_leaf->dl_list;
1297         }
1298
1299         /* Neither of these are a disk corruption - that should have
1300          * been caught by lookup, before we got here. */
1301         BUG_ON(le16_to_cpu(entry_list->de_count) <= 0);
1302         BUG_ON(le16_to_cpu(entry_list->de_num_used) <= 0);
1303
1304         index = (char *)dx_entry - (char *)entry_list->de_entries;
1305         index /= sizeof(*dx_entry);
1306
1307         if (index >= le16_to_cpu(entry_list->de_num_used)) {
1308                 mlog(ML_ERROR, "Dir %llu: Bad dx_entry ptr idx %d, (%p, %p)\n",
1309                      (unsigned long long)OCFS2_I(dir)->ip_blkno, index,
1310                      entry_list, dx_entry);
1311                 return -EIO;
1312         }
1313
1314         /*
1315          * We know that removal of this dirent will leave enough room
1316          * for a new one, so add this block to the free list if it
1317          * isn't already there.
1318          */
1319         trailer = ocfs2_trailer_from_bh(leaf_bh, dir->i_sb);
1320         if (trailer->db_free_rec_len == 0)
1321                 add_to_free_list = 1;
1322
1323         /*
1324          * Add the block holding our index into the journal before
1325          * removing the unindexed entry. If we get an error return
1326          * from __ocfs2_delete_entry(), then it hasn't removed the
1327          * entry yet. Likewise, successful return means we *must*
1328          * remove the indexed entry.
1329          *
1330          * We're also careful to journal the root tree block here as
1331          * the entry count needs to be updated. Also, we might be
1332          * adding to the start of the free list.
1333          */
1334         ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
1335                                       OCFS2_JOURNAL_ACCESS_WRITE);
1336         if (ret) {
1337                 mlog_errno(ret);
1338                 goto out;
1339         }
1340
1341         if (!ocfs2_dx_root_inline(dx_root)) {
1342                 ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir),
1343                                               lookup->dl_dx_leaf_bh,
1344                                               OCFS2_JOURNAL_ACCESS_WRITE);
1345                 if (ret) {
1346                         mlog_errno(ret);
1347                         goto out;
1348                 }
1349         }
1350
1351         mlog(0, "Dir %llu: delete entry at index: %d\n",
1352              (unsigned long long)OCFS2_I(dir)->ip_blkno, index);
1353
1354         ret = __ocfs2_delete_entry(handle, dir, lookup->dl_entry,
1355                                    leaf_bh, leaf_bh->b_data, leaf_bh->b_size);
1356         if (ret) {
1357                 mlog_errno(ret);
1358                 goto out;
1359         }
1360
1361         max_rec_len = ocfs2_find_max_rec_len(dir->i_sb, leaf_bh);
1362         trailer->db_free_rec_len = cpu_to_le16(max_rec_len);
1363         if (add_to_free_list) {
1364                 trailer->db_free_next = dx_root->dr_free_blk;
1365                 dx_root->dr_free_blk = cpu_to_le64(leaf_bh->b_blocknr);
1366                 ocfs2_journal_dirty(handle, dx_root_bh);
1367         }
1368
1369         /* leaf_bh was journal_accessed for us in __ocfs2_delete_entry */
1370         ocfs2_journal_dirty(handle, leaf_bh);
1371
1372         le32_add_cpu(&dx_root->dr_num_entries, -1);
1373         ocfs2_journal_dirty(handle, dx_root_bh);
1374
1375         ocfs2_dx_list_remove_entry(entry_list, index);
1376
1377         if (!ocfs2_dx_root_inline(dx_root))
1378                 ocfs2_journal_dirty(handle, lookup->dl_dx_leaf_bh);
1379
1380 out:
1381         return ret;
1382 }
1383
1384 static inline int ocfs2_delete_entry_id(handle_t *handle,
1385                                         struct inode *dir,
1386                                         struct ocfs2_dir_entry *de_del,
1387                                         struct buffer_head *bh)
1388 {
1389         int ret;
1390         struct buffer_head *di_bh = NULL;
1391         struct ocfs2_dinode *di;
1392         struct ocfs2_inline_data *data;
1393
1394         ret = ocfs2_read_inode_block(dir, &di_bh);
1395         if (ret) {
1396                 mlog_errno(ret);
1397                 goto out;
1398         }
1399
1400         di = (struct ocfs2_dinode *)di_bh->b_data;
1401         data = &di->id2.i_data;
1402
1403         ret = __ocfs2_delete_entry(handle, dir, de_del, bh, data->id_data,
1404                                    i_size_read(dir));
1405
1406         brelse(di_bh);
1407 out:
1408         return ret;
1409 }
1410
1411 static inline int ocfs2_delete_entry_el(handle_t *handle,
1412                                         struct inode *dir,
1413                                         struct ocfs2_dir_entry *de_del,
1414                                         struct buffer_head *bh)
1415 {
1416         return __ocfs2_delete_entry(handle, dir, de_del, bh, bh->b_data,
1417                                     bh->b_size);
1418 }
1419
1420 /*
1421  * Delete a directory entry. Hide the details of directory
1422  * implementation from the caller.
1423  */
1424 int ocfs2_delete_entry(handle_t *handle,
1425                        struct inode *dir,
1426                        struct ocfs2_dir_lookup_result *res)
1427 {
1428         if (ocfs2_dir_indexed(dir))
1429                 return ocfs2_delete_entry_dx(handle, dir, res);
1430
1431         if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
1432                 return ocfs2_delete_entry_id(handle, dir, res->dl_entry,
1433                                              res->dl_leaf_bh);
1434
1435         return ocfs2_delete_entry_el(handle, dir, res->dl_entry,
1436                                      res->dl_leaf_bh);
1437 }
1438
1439 /*
1440  * Check whether 'de' has enough room to hold an entry of
1441  * 'new_rec_len' bytes.
1442  */
1443 static inline int ocfs2_dirent_would_fit(struct ocfs2_dir_entry *de,
1444                                          unsigned int new_rec_len)
1445 {
1446         unsigned int de_really_used;
1447
1448         /* Check whether this is an empty record with enough space */
1449         if (le64_to_cpu(de->inode) == 0 &&
1450             le16_to_cpu(de->rec_len) >= new_rec_len)
1451                 return 1;
1452
1453         /*
1454          * Record might have free space at the end which we can
1455          * use.
1456          */
1457         de_really_used = OCFS2_DIR_REC_LEN(de->name_len);
1458         if (le16_to_cpu(de->rec_len) >= (de_really_used + new_rec_len))
1459             return 1;
1460
1461         return 0;
1462 }
1463
1464 static void ocfs2_dx_dir_leaf_insert_tail(struct ocfs2_dx_leaf *dx_leaf,
1465                                           struct ocfs2_dx_entry *dx_new_entry)
1466 {
1467         int i;
1468
1469         i = le16_to_cpu(dx_leaf->dl_list.de_num_used);
1470         dx_leaf->dl_list.de_entries[i] = *dx_new_entry;
1471
1472         le16_add_cpu(&dx_leaf->dl_list.de_num_used, 1);
1473 }
1474
1475 static void ocfs2_dx_entry_list_insert(struct ocfs2_dx_entry_list *entry_list,
1476                                        struct ocfs2_dx_hinfo *hinfo,
1477                                        u64 dirent_blk)
1478 {
1479         int i;
1480         struct ocfs2_dx_entry *dx_entry;
1481
1482         i = le16_to_cpu(entry_list->de_num_used);
1483         dx_entry = &entry_list->de_entries[i];
1484
1485         memset(dx_entry, 0, sizeof(*dx_entry));
1486         dx_entry->dx_major_hash = cpu_to_le32(hinfo->major_hash);
1487         dx_entry->dx_minor_hash = cpu_to_le32(hinfo->minor_hash);
1488         dx_entry->dx_dirent_blk = cpu_to_le64(dirent_blk);
1489
1490         le16_add_cpu(&entry_list->de_num_used, 1);
1491 }
1492
1493 static int __ocfs2_dx_dir_leaf_insert(struct inode *dir, handle_t *handle,
1494                                       struct ocfs2_dx_hinfo *hinfo,
1495                                       u64 dirent_blk,
1496                                       struct buffer_head *dx_leaf_bh)
1497 {
1498         int ret;
1499         struct ocfs2_dx_leaf *dx_leaf;
1500
1501         ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), dx_leaf_bh,
1502                                       OCFS2_JOURNAL_ACCESS_WRITE);
1503         if (ret) {
1504                 mlog_errno(ret);
1505                 goto out;
1506         }
1507
1508         dx_leaf = (struct ocfs2_dx_leaf *)dx_leaf_bh->b_data;
1509         ocfs2_dx_entry_list_insert(&dx_leaf->dl_list, hinfo, dirent_blk);
1510         ocfs2_journal_dirty(handle, dx_leaf_bh);
1511
1512 out:
1513         return ret;
1514 }
1515
1516 static void ocfs2_dx_inline_root_insert(struct inode *dir, handle_t *handle,
1517                                         struct ocfs2_dx_hinfo *hinfo,
1518                                         u64 dirent_blk,
1519                                         struct ocfs2_dx_root_block *dx_root)
1520 {
1521         ocfs2_dx_entry_list_insert(&dx_root->dr_entries, hinfo, dirent_blk);
1522 }
1523
1524 static int ocfs2_dx_dir_insert(struct inode *dir, handle_t *handle,
1525                                struct ocfs2_dir_lookup_result *lookup)
1526 {
1527         int ret = 0;
1528         struct ocfs2_dx_root_block *dx_root;
1529         struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh;
1530
1531         ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
1532                                       OCFS2_JOURNAL_ACCESS_WRITE);
1533         if (ret) {
1534                 mlog_errno(ret);
1535                 goto out;
1536         }
1537
1538         dx_root = (struct ocfs2_dx_root_block *)lookup->dl_dx_root_bh->b_data;
1539         if (ocfs2_dx_root_inline(dx_root)) {
1540                 ocfs2_dx_inline_root_insert(dir, handle,
1541                                             &lookup->dl_hinfo,
1542                                             lookup->dl_leaf_bh->b_blocknr,
1543                                             dx_root);
1544         } else {
1545                 ret = __ocfs2_dx_dir_leaf_insert(dir, handle, &lookup->dl_hinfo,
1546                                                  lookup->dl_leaf_bh->b_blocknr,
1547                                                  lookup->dl_dx_leaf_bh);
1548                 if (ret)
1549                         goto out;
1550         }
1551
1552         le32_add_cpu(&dx_root->dr_num_entries, 1);
1553         ocfs2_journal_dirty(handle, dx_root_bh);
1554
1555 out:
1556         return ret;
1557 }
1558
1559 static void ocfs2_remove_block_from_free_list(struct inode *dir,
1560                                        handle_t *handle,
1561                                        struct ocfs2_dir_lookup_result *lookup)
1562 {
1563         struct ocfs2_dir_block_trailer *trailer, *prev;
1564         struct ocfs2_dx_root_block *dx_root;
1565         struct buffer_head *bh;
1566
1567         trailer = ocfs2_trailer_from_bh(lookup->dl_leaf_bh, dir->i_sb);
1568
1569         if (ocfs2_free_list_at_root(lookup)) {
1570                 bh = lookup->dl_dx_root_bh;
1571                 dx_root = (struct ocfs2_dx_root_block *)bh->b_data;
1572                 dx_root->dr_free_blk = trailer->db_free_next;
1573         } else {
1574                 bh = lookup->dl_prev_leaf_bh;
1575                 prev = ocfs2_trailer_from_bh(bh, dir->i_sb);
1576                 prev->db_free_next = trailer->db_free_next;
1577         }
1578
1579         trailer->db_free_rec_len = cpu_to_le16(0);
1580         trailer->db_free_next = cpu_to_le64(0);
1581
1582         ocfs2_journal_dirty(handle, bh);
1583         ocfs2_journal_dirty(handle, lookup->dl_leaf_bh);
1584 }
1585
1586 /*
1587  * This expects that a journal write has been reserved on
1588  * lookup->dl_prev_leaf_bh or lookup->dl_dx_root_bh
1589  */
1590 static void ocfs2_recalc_free_list(struct inode *dir, handle_t *handle,
1591                                    struct ocfs2_dir_lookup_result *lookup)
1592 {
1593         int max_rec_len;
1594         struct ocfs2_dir_block_trailer *trailer;
1595
1596         /* Walk dl_leaf_bh to figure out what the new free rec_len is. */
1597         max_rec_len = ocfs2_find_max_rec_len(dir->i_sb, lookup->dl_leaf_bh);
1598         if (max_rec_len) {
1599                 /*
1600                  * There's still room in this block, so no need to remove it
1601                  * from the free list. In this case, we just want to update
1602                  * the rec len accounting.
1603                  */
1604                 trailer = ocfs2_trailer_from_bh(lookup->dl_leaf_bh, dir->i_sb);
1605                 trailer->db_free_rec_len = cpu_to_le16(max_rec_len);
1606                 ocfs2_journal_dirty(handle, lookup->dl_leaf_bh);
1607         } else {
1608                 ocfs2_remove_block_from_free_list(dir, handle, lookup);
1609         }
1610 }
1611
1612 /* we don't always have a dentry for what we want to add, so people
1613  * like orphan dir can call this instead.
1614  *
1615  * The lookup context must have been filled from
1616  * ocfs2_prepare_dir_for_insert.
1617  */
1618 int __ocfs2_add_entry(handle_t *handle,
1619                       struct inode *dir,
1620                       const char *name, int namelen,
1621                       struct inode *inode, u64 blkno,
1622                       struct buffer_head *parent_fe_bh,
1623                       struct ocfs2_dir_lookup_result *lookup)
1624 {
1625         unsigned long offset;
1626         unsigned short rec_len;
1627         struct ocfs2_dir_entry *de, *de1;
1628         struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_fe_bh->b_data;
1629         struct super_block *sb = dir->i_sb;
1630         int retval, status;
1631         unsigned int size = sb->s_blocksize;
1632         struct buffer_head *insert_bh = lookup->dl_leaf_bh;
1633         char *data_start = insert_bh->b_data;
1634
1635         mlog_entry_void();
1636
1637         if (!namelen)
1638                 return -EINVAL;
1639
1640         if (ocfs2_dir_indexed(dir)) {
1641                 struct buffer_head *bh;
1642
1643                 /*
1644                  * An indexed dir may require that we update the free space
1645                  * list. Reserve a write to the previous node in the list so
1646                  * that we don't fail later.
1647                  *
1648                  * XXX: This can be either a dx_root_block, or an unindexed
1649                  * directory tree leaf block.
1650                  */
1651                 if (ocfs2_free_list_at_root(lookup)) {
1652                         bh = lookup->dl_dx_root_bh;
1653                         retval = ocfs2_journal_access_dr(handle,
1654                                                  INODE_CACHE(dir), bh,
1655                                                  OCFS2_JOURNAL_ACCESS_WRITE);
1656                 } else {
1657                         bh = lookup->dl_prev_leaf_bh;
1658                         retval = ocfs2_journal_access_db(handle,
1659                                                  INODE_CACHE(dir), bh,
1660                                                  OCFS2_JOURNAL_ACCESS_WRITE);
1661                 }
1662                 if (retval) {
1663                         mlog_errno(retval);
1664                         return retval;
1665                 }
1666         } else if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1667                 data_start = di->id2.i_data.id_data;
1668                 size = i_size_read(dir);
1669
1670                 BUG_ON(insert_bh != parent_fe_bh);
1671         }
1672
1673         rec_len = OCFS2_DIR_REC_LEN(namelen);
1674         offset = 0;
1675         de = (struct ocfs2_dir_entry *) data_start;
1676         while (1) {
1677                 BUG_ON((char *)de >= (size + data_start));
1678
1679                 /* These checks should've already been passed by the
1680                  * prepare function, but I guess we can leave them
1681                  * here anyway. */
1682                 if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
1683                         retval = -ENOENT;
1684                         goto bail;
1685                 }
1686                 if (ocfs2_match(namelen, name, de)) {
1687                         retval = -EEXIST;
1688                         goto bail;
1689                 }
1690
1691                 /* We're guaranteed that we should have space, so we
1692                  * can't possibly have hit the trailer...right? */
1693                 mlog_bug_on_msg(ocfs2_skip_dir_trailer(dir, de, offset, size),
1694                                 "Hit dir trailer trying to insert %.*s "
1695                                 "(namelen %d) into directory %llu.  "
1696                                 "offset is %lu, trailer offset is %d\n",
1697                                 namelen, name, namelen,
1698                                 (unsigned long long)parent_fe_bh->b_blocknr,
1699                                 offset, ocfs2_dir_trailer_blk_off(dir->i_sb));
1700
1701                 if (ocfs2_dirent_would_fit(de, rec_len)) {
1702                         dir->i_mtime = dir->i_ctime = CURRENT_TIME;
1703                         retval = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh);
1704                         if (retval < 0) {
1705                                 mlog_errno(retval);
1706                                 goto bail;
1707                         }
1708
1709                         if (insert_bh == parent_fe_bh)
1710                                 status = ocfs2_journal_access_di(handle,
1711                                                                  INODE_CACHE(dir),
1712                                                                  insert_bh,
1713                                                                  OCFS2_JOURNAL_ACCESS_WRITE);
1714                         else {
1715                                 status = ocfs2_journal_access_db(handle,
1716                                                                  INODE_CACHE(dir),
1717                                                                  insert_bh,
1718                                               OCFS2_JOURNAL_ACCESS_WRITE);
1719
1720                                 if (ocfs2_dir_indexed(dir)) {
1721                                         status = ocfs2_dx_dir_insert(dir,
1722                                                                 handle,
1723                                                                 lookup);
1724                                         if (status) {
1725                                                 mlog_errno(status);
1726                                                 goto bail;
1727                                         }
1728                                 }
1729                         }
1730
1731                         /* By now the buffer is marked for journaling */
1732                         offset += le16_to_cpu(de->rec_len);
1733                         if (le64_to_cpu(de->inode)) {
1734                                 de1 = (struct ocfs2_dir_entry *)((char *) de +
1735                                         OCFS2_DIR_REC_LEN(de->name_len));
1736                                 de1->rec_len =
1737                                         cpu_to_le16(le16_to_cpu(de->rec_len) -
1738                                         OCFS2_DIR_REC_LEN(de->name_len));
1739                                 de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
1740                                 de = de1;
1741                         }
1742                         de->file_type = OCFS2_FT_UNKNOWN;
1743                         if (blkno) {
1744                                 de->inode = cpu_to_le64(blkno);
1745                                 ocfs2_set_de_type(de, inode->i_mode);
1746                         } else
1747                                 de->inode = 0;
1748                         de->name_len = namelen;
1749                         memcpy(de->name, name, namelen);
1750
1751                         if (ocfs2_dir_indexed(dir))
1752                                 ocfs2_recalc_free_list(dir, handle, lookup);
1753
1754                         dir->i_version++;
1755                         ocfs2_journal_dirty(handle, insert_bh);
1756                         retval = 0;
1757                         goto bail;
1758                 }
1759
1760                 offset += le16_to_cpu(de->rec_len);
1761                 de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
1762         }
1763
1764         /* when you think about it, the assert above should prevent us
1765          * from ever getting here. */
1766         retval = -ENOSPC;
1767 bail:
1768
1769         mlog_exit(retval);
1770         return retval;
1771 }
1772
1773 static int ocfs2_dir_foreach_blk_id(struct inode *inode,
1774                                     u64 *f_version,
1775                                     loff_t *f_pos, void *priv,
1776                                     filldir_t filldir, int *filldir_err)
1777 {
1778         int ret, i, filldir_ret;
1779         unsigned long offset = *f_pos;
1780         struct buffer_head *di_bh = NULL;
1781         struct ocfs2_dinode *di;
1782         struct ocfs2_inline_data *data;
1783         struct ocfs2_dir_entry *de;
1784
1785         ret = ocfs2_read_inode_block(inode, &di_bh);
1786         if (ret) {
1787                 mlog(ML_ERROR, "Unable to read inode block for dir %llu\n",
1788                      (unsigned long long)OCFS2_I(inode)->ip_blkno);
1789                 goto out;
1790         }
1791
1792         di = (struct ocfs2_dinode *)di_bh->b_data;
1793         data = &di->id2.i_data;
1794
1795         while (*f_pos < i_size_read(inode)) {
1796 revalidate:
1797                 /* If the dir block has changed since the last call to
1798                  * readdir(2), then we might be pointing to an invalid
1799                  * dirent right now.  Scan from the start of the block
1800                  * to make sure. */
1801                 if (*f_version != inode->i_version) {
1802                         for (i = 0; i < i_size_read(inode) && i < offset; ) {
1803                                 de = (struct ocfs2_dir_entry *)
1804                                         (data->id_data + i);
1805                                 /* It's too expensive to do a full
1806                                  * dirent test each time round this
1807                                  * loop, but we do have to test at
1808                                  * least that it is non-zero.  A
1809                                  * failure will be detected in the
1810                                  * dirent test below. */
1811                                 if (le16_to_cpu(de->rec_len) <
1812                                     OCFS2_DIR_REC_LEN(1))
1813                                         break;
1814                                 i += le16_to_cpu(de->rec_len);
1815                         }
1816                         *f_pos = offset = i;
1817                         *f_version = inode->i_version;
1818                 }
1819
1820                 de = (struct ocfs2_dir_entry *) (data->id_data + *f_pos);
1821                 if (!ocfs2_check_dir_entry(inode, de, di_bh, *f_pos)) {
1822                         /* On error, skip the f_pos to the end. */
1823                         *f_pos = i_size_read(inode);
1824                         goto out;
1825                 }
1826                 offset += le16_to_cpu(de->rec_len);
1827                 if (le64_to_cpu(de->inode)) {
1828                         /* We might block in the next section
1829                          * if the data destination is
1830                          * currently swapped out.  So, use a
1831                          * version stamp to detect whether or
1832                          * not the directory has been modified
1833                          * during the copy operation.
1834                          */
1835                         u64 version = *f_version;
1836                         unsigned char d_type = DT_UNKNOWN;
1837
1838                         if (de->file_type < OCFS2_FT_MAX)
1839                                 d_type = ocfs2_filetype_table[de->file_type];
1840
1841                         filldir_ret = filldir(priv, de->name,
1842                                               de->name_len,
1843                                               *f_pos,
1844                                               le64_to_cpu(de->inode),
1845                                               d_type);
1846                         if (filldir_ret) {
1847                                 if (filldir_err)
1848                                         *filldir_err = filldir_ret;
1849                                 break;
1850                         }
1851                         if (version != *f_version)
1852                                 goto revalidate;
1853                 }
1854                 *f_pos += le16_to_cpu(de->rec_len);
1855         }
1856
1857 out:
1858         brelse(di_bh);
1859
1860         return 0;
1861 }
1862
1863 /*
1864  * NOTE: This function can be called against unindexed directories,
1865  * and indexed ones.
1866  */
1867 static int ocfs2_dir_foreach_blk_el(struct inode *inode,
1868                                     u64 *f_version,
1869                                     loff_t *f_pos, void *priv,
1870                                     filldir_t filldir, int *filldir_err)
1871 {
1872         int error = 0;
1873         unsigned long offset, blk, last_ra_blk = 0;
1874         int i, stored;
1875         struct buffer_head * bh, * tmp;
1876         struct ocfs2_dir_entry * de;
1877         struct super_block * sb = inode->i_sb;
1878         unsigned int ra_sectors = 16;
1879
1880         stored = 0;
1881         bh = NULL;
1882
1883         offset = (*f_pos) & (sb->s_blocksize - 1);
1884
1885         while (!error && !stored && *f_pos < i_size_read(inode)) {
1886                 blk = (*f_pos) >> sb->s_blocksize_bits;
1887                 if (ocfs2_read_dir_block(inode, blk, &bh, 0)) {
1888                         /* Skip the corrupt dirblock and keep trying */
1889                         *f_pos += sb->s_blocksize - offset;
1890                         continue;
1891                 }
1892
1893                 /* The idea here is to begin with 8k read-ahead and to stay
1894                  * 4k ahead of our current position.
1895                  *
1896                  * TODO: Use the pagecache for this. We just need to
1897                  * make sure it's cluster-safe... */
1898                 if (!last_ra_blk
1899                     || (((last_ra_blk - blk) << 9) <= (ra_sectors / 2))) {
1900                         for (i = ra_sectors >> (sb->s_blocksize_bits - 9);
1901                              i > 0; i--) {
1902                                 tmp = NULL;
1903                                 if (!ocfs2_read_dir_block(inode, ++blk, &tmp,
1904                                                           OCFS2_BH_READAHEAD))
1905                                         brelse(tmp);
1906                         }
1907                         last_ra_blk = blk;
1908                         ra_sectors = 8;
1909                 }
1910
1911 revalidate:
1912                 /* If the dir block has changed since the last call to
1913                  * readdir(2), then we might be pointing to an invalid
1914                  * dirent right now.  Scan from the start of the block
1915                  * to make sure. */
1916                 if (*f_version != inode->i_version) {
1917                         for (i = 0; i < sb->s_blocksize && i < offset; ) {
1918                                 de = (struct ocfs2_dir_entry *) (bh->b_data + i);
1919                                 /* It's too expensive to do a full
1920                                  * dirent test each time round this
1921                                  * loop, but we do have to test at
1922                                  * least that it is non-zero.  A
1923                                  * failure will be detected in the
1924                                  * dirent test below. */
1925                                 if (le16_to_cpu(de->rec_len) <
1926                                     OCFS2_DIR_REC_LEN(1))
1927                                         break;
1928                                 i += le16_to_cpu(de->rec_len);
1929                         }
1930                         offset = i;
1931                         *f_pos = ((*f_pos) & ~(sb->s_blocksize - 1))
1932                                 | offset;
1933                         *f_version = inode->i_version;
1934                 }
1935
1936                 while (!error && *f_pos < i_size_read(inode)
1937                        && offset < sb->s_blocksize) {
1938                         de = (struct ocfs2_dir_entry *) (bh->b_data + offset);
1939                         if (!ocfs2_check_dir_entry(inode, de, bh, offset)) {
1940                                 /* On error, skip the f_pos to the
1941                                    next block. */
1942                                 *f_pos = ((*f_pos) | (sb->s_blocksize - 1)) + 1;
1943                                 brelse(bh);
1944                                 goto out;
1945                         }
1946                         offset += le16_to_cpu(de->rec_len);
1947                         if (le64_to_cpu(de->inode)) {
1948                                 /* We might block in the next section
1949                                  * if the data destination is
1950                                  * currently swapped out.  So, use a
1951                                  * version stamp to detect whether or
1952                                  * not the directory has been modified
1953                                  * during the copy operation.
1954                                  */
1955                                 unsigned long version = *f_version;
1956                                 unsigned char d_type = DT_UNKNOWN;
1957
1958                                 if (de->file_type < OCFS2_FT_MAX)
1959                                         d_type = ocfs2_filetype_table[de->file_type];
1960                                 error = filldir(priv, de->name,
1961                                                 de->name_len,
1962                                                 *f_pos,
1963                                                 le64_to_cpu(de->inode),
1964                                                 d_type);
1965                                 if (error) {
1966                                         if (filldir_err)
1967                                                 *filldir_err = error;
1968                                         break;
1969                                 }
1970                                 if (version != *f_version)
1971                                         goto revalidate;
1972                                 stored ++;
1973                         }
1974                         *f_pos += le16_to_cpu(de->rec_len);
1975                 }
1976                 offset = 0;
1977                 brelse(bh);
1978                 bh = NULL;
1979         }
1980
1981         stored = 0;
1982 out:
1983         return stored;
1984 }
1985
1986 static int ocfs2_dir_foreach_blk(struct inode *inode, u64 *f_version,
1987                                  loff_t *f_pos, void *priv, filldir_t filldir,
1988                                  int *filldir_err)
1989 {
1990         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
1991                 return ocfs2_dir_foreach_blk_id(inode, f_version, f_pos, priv,
1992                                                 filldir, filldir_err);
1993
1994         return ocfs2_dir_foreach_blk_el(inode, f_version, f_pos, priv, filldir,
1995                                         filldir_err);
1996 }
1997
1998 /*
1999  * This is intended to be called from inside other kernel functions,
2000  * so we fake some arguments.
2001  */
2002 int ocfs2_dir_foreach(struct inode *inode, loff_t *f_pos, void *priv,
2003                       filldir_t filldir)
2004 {
2005         int ret = 0, filldir_err = 0;
2006         u64 version = inode->i_version;
2007
2008         while (*f_pos < i_size_read(inode)) {
2009                 ret = ocfs2_dir_foreach_blk(inode, &version, f_pos, priv,
2010                                             filldir, &filldir_err);
2011                 if (ret || filldir_err)
2012                         break;
2013         }
2014
2015         if (ret > 0)
2016                 ret = -EIO;
2017
2018         return 0;
2019 }
2020
2021 /*
2022  * ocfs2_readdir()
2023  *
2024  */
2025 int ocfs2_readdir(struct file * filp, void * dirent, filldir_t filldir)
2026 {
2027         int error = 0;
2028         struct inode *inode = filp->f_path.dentry->d_inode;
2029         int lock_level = 0;
2030
2031         mlog_entry("dirino=%llu\n",
2032                    (unsigned long long)OCFS2_I(inode)->ip_blkno);
2033
2034         error = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level);
2035         if (lock_level && error >= 0) {
2036                 /* We release EX lock which used to update atime
2037                  * and get PR lock again to reduce contention
2038                  * on commonly accessed directories. */
2039                 ocfs2_inode_unlock(inode, 1);
2040                 lock_level = 0;
2041                 error = ocfs2_inode_lock(inode, NULL, 0);
2042         }
2043         if (error < 0) {
2044                 if (error != -ENOENT)
2045                         mlog_errno(error);
2046                 /* we haven't got any yet, so propagate the error. */
2047                 goto bail_nolock;
2048         }
2049
2050         error = ocfs2_dir_foreach_blk(inode, &filp->f_version, &filp->f_pos,
2051                                       dirent, filldir, NULL);
2052
2053         ocfs2_inode_unlock(inode, lock_level);
2054
2055 bail_nolock:
2056         mlog_exit(error);
2057
2058         return error;
2059 }
2060
2061 /*
2062  * NOTE: this should always be called with parent dir i_mutex taken.
2063  */
2064 int ocfs2_find_files_on_disk(const char *name,
2065                              int namelen,
2066                              u64 *blkno,
2067                              struct inode *inode,
2068                              struct ocfs2_dir_lookup_result *lookup)
2069 {
2070         int status = -ENOENT;
2071
2072         mlog(0, "name=%.*s, blkno=%p, inode=%llu\n", namelen, name, blkno,
2073              (unsigned long long)OCFS2_I(inode)->ip_blkno);
2074
2075         status = ocfs2_find_entry(name, namelen, inode, lookup);
2076         if (status)
2077                 goto leave;
2078
2079         *blkno = le64_to_cpu(lookup->dl_entry->inode);
2080
2081         status = 0;
2082 leave:
2083
2084         return status;
2085 }
2086
2087 /*
2088  * Convenience function for callers which just want the block number
2089  * mapped to a name and don't require the full dirent info, etc.
2090  */
2091 int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name,
2092                                int namelen, u64 *blkno)
2093 {
2094         int ret;
2095         struct ocfs2_dir_lookup_result lookup = { NULL, };
2096
2097         ret = ocfs2_find_files_on_disk(name, namelen, blkno, dir, &lookup);
2098         ocfs2_free_dir_lookup_result(&lookup);
2099
2100         return ret;
2101 }
2102
2103 /* Check for a name within a directory.
2104  *
2105  * Return 0 if the name does not exist
2106  * Return -EEXIST if the directory contains the name
2107  *
2108  * Callers should have i_mutex + a cluster lock on dir
2109  */
2110 int ocfs2_check_dir_for_entry(struct inode *dir,
2111                               const char *name,
2112                               int namelen)
2113 {
2114         int ret;
2115         struct ocfs2_dir_lookup_result lookup = { NULL, };
2116
2117         mlog_entry("dir %llu, name '%.*s'\n",
2118                    (unsigned long long)OCFS2_I(dir)->ip_blkno, namelen, name);
2119
2120         ret = -EEXIST;
2121         if (ocfs2_find_entry(name, namelen, dir, &lookup) == 0)
2122                 goto bail;
2123
2124         ret = 0;
2125 bail:
2126         ocfs2_free_dir_lookup_result(&lookup);
2127
2128         mlog_exit(ret);
2129         return ret;
2130 }
2131
2132 struct ocfs2_empty_dir_priv {
2133         unsigned seen_dot;
2134         unsigned seen_dot_dot;
2135         unsigned seen_other;
2136         unsigned dx_dir;
2137 };
2138 static int ocfs2_empty_dir_filldir(void *priv, const char *name, int name_len,
2139                                    loff_t pos, u64 ino, unsigned type)
2140 {
2141         struct ocfs2_empty_dir_priv *p = priv;
2142
2143         /*
2144          * Check the positions of "." and ".." records to be sure
2145          * they're in the correct place.
2146          *
2147          * Indexed directories don't need to proceed past the first
2148          * two entries, so we end the scan after seeing '..'. Despite
2149          * that, we allow the scan to proceed In the event that we
2150          * have a corrupted indexed directory (no dot or dot dot
2151          * entries). This allows us to double check for existing
2152          * entries which might not have been found in the index.
2153          */
2154         if (name_len == 1 && !strncmp(".", name, 1) && pos == 0) {
2155                 p->seen_dot = 1;
2156                 return 0;
2157         }
2158
2159         if (name_len == 2 && !strncmp("..", name, 2) &&
2160             pos == OCFS2_DIR_REC_LEN(1)) {
2161                 p->seen_dot_dot = 1;
2162
2163                 if (p->dx_dir && p->seen_dot)
2164                         return 1;
2165
2166                 return 0;
2167         }
2168
2169         p->seen_other = 1;
2170         return 1;
2171 }
2172
2173 static int ocfs2_empty_dir_dx(struct inode *inode,
2174                               struct ocfs2_empty_dir_priv *priv)
2175 {
2176         int ret;
2177         struct buffer_head *di_bh = NULL;
2178         struct buffer_head *dx_root_bh = NULL;
2179         struct ocfs2_dinode *di;
2180         struct ocfs2_dx_root_block *dx_root;
2181
2182         priv->dx_dir = 1;
2183
2184         ret = ocfs2_read_inode_block(inode, &di_bh);
2185         if (ret) {
2186                 mlog_errno(ret);
2187                 goto out;
2188         }
2189         di = (struct ocfs2_dinode *)di_bh->b_data;
2190
2191         ret = ocfs2_read_dx_root(inode, di, &dx_root_bh);
2192         if (ret) {
2193                 mlog_errno(ret);
2194                 goto out;
2195         }
2196         dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
2197
2198         if (le32_to_cpu(dx_root->dr_num_entries) != 2)
2199                 priv->seen_other = 1;
2200
2201 out:
2202         brelse(di_bh);
2203         brelse(dx_root_bh);
2204         return ret;
2205 }
2206
2207 /*
2208  * routine to check that the specified directory is empty (for rmdir)
2209  *
2210  * Returns 1 if dir is empty, zero otherwise.
2211  *
2212  * XXX: This is a performance problem for unindexed directories.
2213  */
2214 int ocfs2_empty_dir(struct inode *inode)
2215 {
2216         int ret;
2217         loff_t start = 0;
2218         struct ocfs2_empty_dir_priv priv;
2219
2220         memset(&priv, 0, sizeof(priv));
2221
2222         if (ocfs2_dir_indexed(inode)) {
2223                 ret = ocfs2_empty_dir_dx(inode, &priv);
2224                 if (ret)
2225                         mlog_errno(ret);
2226                 /*
2227                  * We still run ocfs2_dir_foreach to get the checks
2228                  * for "." and "..".
2229                  */
2230         }
2231
2232         ret = ocfs2_dir_foreach(inode, &start, &priv, ocfs2_empty_dir_filldir);
2233         if (ret)
2234                 mlog_errno(ret);
2235
2236         if (!priv.seen_dot || !priv.seen_dot_dot) {
2237                 mlog(ML_ERROR, "bad directory (dir #%llu) - no `.' or `..'\n",
2238                      (unsigned long long)OCFS2_I(inode)->ip_blkno);
2239                 /*
2240                  * XXX: Is it really safe to allow an unlink to continue?
2241                  */
2242                 return 1;
2243         }
2244
2245         return !priv.seen_other;
2246 }
2247
2248 /*
2249  * Fills "." and ".." dirents in a new directory block. Returns dirent for
2250  * "..", which might be used during creation of a directory with a trailing
2251  * header. It is otherwise safe to ignore the return code.
2252  */
2253 static struct ocfs2_dir_entry *ocfs2_fill_initial_dirents(struct inode *inode,
2254                                                           struct inode *parent,
2255                                                           char *start,
2256                                                           unsigned int size)
2257 {
2258         struct ocfs2_dir_entry *de = (struct ocfs2_dir_entry *)start;
2259
2260         de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
2261         de->name_len = 1;
2262         de->rec_len =
2263                 cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
2264         strcpy(de->name, ".");
2265         ocfs2_set_de_type(de, S_IFDIR);
2266
2267         de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len));
2268         de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno);
2269         de->rec_len = cpu_to_le16(size - OCFS2_DIR_REC_LEN(1));
2270         de->name_len = 2;
2271         strcpy(de->name, "..");
2272         ocfs2_set_de_type(de, S_IFDIR);
2273
2274         return de;
2275 }
2276
2277 /*
2278  * This works together with code in ocfs2_mknod_locked() which sets
2279  * the inline-data flag and initializes the inline-data section.
2280  */
2281 static int ocfs2_fill_new_dir_id(struct ocfs2_super *osb,
2282                                  handle_t *handle,
2283                                  struct inode *parent,
2284                                  struct inode *inode,
2285                                  struct buffer_head *di_bh)
2286 {
2287         int ret;
2288         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2289         struct ocfs2_inline_data *data = &di->id2.i_data;
2290         unsigned int size = le16_to_cpu(data->id_count);
2291
2292         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2293                                       OCFS2_JOURNAL_ACCESS_WRITE);
2294         if (ret) {
2295                 mlog_errno(ret);
2296                 goto out;
2297         }
2298
2299         ocfs2_fill_initial_dirents(inode, parent, data->id_data, size);
2300         ocfs2_journal_dirty(handle, di_bh);
2301
2302         i_size_write(inode, size);
2303         inode->i_nlink = 2;
2304         inode->i_blocks = ocfs2_inode_sector_count(inode);
2305
2306         ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
2307         if (ret < 0)
2308                 mlog_errno(ret);
2309
2310 out:
2311         return ret;
2312 }
2313
2314 static int ocfs2_fill_new_dir_el(struct ocfs2_super *osb,
2315                                  handle_t *handle,
2316                                  struct inode *parent,
2317                                  struct inode *inode,
2318                                  struct buffer_head *fe_bh,
2319                                  struct ocfs2_alloc_context *data_ac,
2320                                  struct buffer_head **ret_new_bh)
2321 {
2322         int status;
2323         unsigned int size = osb->sb->s_blocksize;
2324         struct buffer_head *new_bh = NULL;
2325         struct ocfs2_dir_entry *de;
2326
2327         mlog_entry_void();
2328
2329         if (ocfs2_new_dir_wants_trailer(inode))
2330                 size = ocfs2_dir_trailer_blk_off(parent->i_sb);
2331
2332         status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
2333                                      data_ac, NULL, &new_bh);
2334         if (status < 0) {
2335                 mlog_errno(status);
2336                 goto bail;
2337         }
2338
2339         ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2340
2341         status = ocfs2_journal_access_db(handle, INODE_CACHE(inode), new_bh,
2342                                          OCFS2_JOURNAL_ACCESS_CREATE);
2343         if (status < 0) {
2344                 mlog_errno(status);
2345                 goto bail;
2346         }
2347         memset(new_bh->b_data, 0, osb->sb->s_blocksize);
2348
2349         de = ocfs2_fill_initial_dirents(inode, parent, new_bh->b_data, size);
2350         if (ocfs2_new_dir_wants_trailer(inode)) {
2351                 int size = le16_to_cpu(de->rec_len);
2352
2353                 /*
2354                  * Figure out the size of the hole left over after
2355                  * insertion of '.' and '..'. The trailer wants this
2356                  * information.
2357                  */
2358                 size -= OCFS2_DIR_REC_LEN(2);
2359                 size -= sizeof(struct ocfs2_dir_block_trailer);
2360
2361                 ocfs2_init_dir_trailer(inode, new_bh, size);
2362         }
2363
2364         ocfs2_journal_dirty(handle, new_bh);
2365
2366         i_size_write(inode, inode->i_sb->s_blocksize);
2367         inode->i_nlink = 2;
2368         inode->i_blocks = ocfs2_inode_sector_count(inode);
2369         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
2370         if (status < 0) {
2371                 mlog_errno(status);
2372                 goto bail;
2373         }
2374
2375         status = 0;
2376         if (ret_new_bh) {
2377                 *ret_new_bh = new_bh;
2378                 new_bh = NULL;
2379         }
2380 bail:
2381         brelse(new_bh);
2382
2383         mlog_exit(status);
2384         return status;
2385 }
2386
2387 static int ocfs2_dx_dir_attach_index(struct ocfs2_super *osb,
2388                                      handle_t *handle, struct inode *dir,
2389                                      struct buffer_head *di_bh,
2390                                      struct buffer_head *dirdata_bh,
2391                                      struct ocfs2_alloc_context *meta_ac,
2392                                      int dx_inline, u32 num_entries,
2393                                      struct buffer_head **ret_dx_root_bh)
2394 {
2395         int ret;
2396         struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
2397         u16 dr_suballoc_bit;
2398         u64 suballoc_loc, dr_blkno;
2399         unsigned int num_bits;
2400         struct buffer_head *dx_root_bh = NULL;
2401         struct ocfs2_dx_root_block *dx_root;
2402         struct ocfs2_dir_block_trailer *trailer =
2403                 ocfs2_trailer_from_bh(dirdata_bh, dir->i_sb);
2404
2405         ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
2406                                    &dr_suballoc_bit, &num_bits, &dr_blkno);
2407         if (ret) {
2408                 mlog_errno(ret);
2409                 goto out;
2410         }
2411
2412         mlog(0, "Dir %llu, attach new index block: %llu\n",
2413              (unsigned long long)OCFS2_I(dir)->ip_blkno,
2414              (unsigned long long)dr_blkno);
2415
2416         dx_root_bh = sb_getblk(osb->sb, dr_blkno);
2417         if (dx_root_bh == NULL) {
2418                 ret = -EIO;
2419                 goto out;
2420         }
2421         ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), dx_root_bh);
2422
2423         ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
2424                                       OCFS2_JOURNAL_ACCESS_CREATE);
2425         if (ret < 0) {
2426                 mlog_errno(ret);
2427                 goto out;
2428         }
2429
2430         dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
2431         memset(dx_root, 0, osb->sb->s_blocksize);
2432         strcpy(dx_root->dr_signature, OCFS2_DX_ROOT_SIGNATURE);
2433         dx_root->dr_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
2434         dx_root->dr_suballoc_loc = cpu_to_le64(suballoc_loc);
2435         dx_root->dr_suballoc_bit = cpu_to_le16(dr_suballoc_bit);
2436         dx_root->dr_fs_generation = cpu_to_le32(osb->fs_generation);
2437         dx_root->dr_blkno = cpu_to_le64(dr_blkno);
2438         dx_root->dr_dir_blkno = cpu_to_le64(OCFS2_I(dir)->ip_blkno);
2439         dx_root->dr_num_entries = cpu_to_le32(num_entries);
2440         if (le16_to_cpu(trailer->db_free_rec_len))
2441                 dx_root->dr_free_blk = cpu_to_le64(dirdata_bh->b_blocknr);
2442         else
2443                 dx_root->dr_free_blk = cpu_to_le64(0);
2444
2445         if (dx_inline) {
2446                 dx_root->dr_flags |= OCFS2_DX_FLAG_INLINE;
2447                 dx_root->dr_entries.de_count =
2448                         cpu_to_le16(ocfs2_dx_entries_per_root(osb->sb));
2449         } else {
2450                 dx_root->dr_list.l_count =
2451                         cpu_to_le16(ocfs2_extent_recs_per_dx_root(osb->sb));
2452         }
2453         ocfs2_journal_dirty(handle, dx_root_bh);
2454
2455         ret = ocfs2_journal_access_di(handle, INODE_CACHE(dir), di_bh,
2456                                       OCFS2_JOURNAL_ACCESS_CREATE);
2457         if (ret) {
2458                 mlog_errno(ret);
2459                 goto out;
2460         }
2461
2462         di->i_dx_root = cpu_to_le64(dr_blkno);
2463
2464         OCFS2_I(dir)->ip_dyn_features |= OCFS2_INDEXED_DIR_FL;
2465         di->i_dyn_features = cpu_to_le16(OCFS2_I(dir)->ip_dyn_features);
2466
2467         ocfs2_journal_dirty(handle, di_bh);
2468
2469         *ret_dx_root_bh = dx_root_bh;
2470         dx_root_bh = NULL;
2471
2472 out:
2473         brelse(dx_root_bh);
2474         return ret;
2475 }
2476
2477 static int ocfs2_dx_dir_format_cluster(struct ocfs2_super *osb,
2478                                        handle_t *handle, struct inode *dir,
2479                                        struct buffer_head **dx_leaves,
2480                                        int num_dx_leaves, u64 start_blk)
2481 {
2482         int ret, i;
2483         struct ocfs2_dx_leaf *dx_leaf;
2484         struct buffer_head *bh;
2485
2486         for (i = 0; i < num_dx_leaves; i++) {
2487                 bh = sb_getblk(osb->sb, start_blk + i);
2488                 if (bh == NULL) {
2489                         ret = -EIO;
2490                         goto out;
2491                 }
2492                 dx_leaves[i] = bh;
2493
2494                 ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), bh);
2495
2496                 ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), bh,
2497                                               OCFS2_JOURNAL_ACCESS_CREATE);
2498                 if (ret < 0) {
2499                         mlog_errno(ret);
2500                         goto out;
2501                 }
2502
2503                 dx_leaf = (struct ocfs2_dx_leaf *) bh->b_data;
2504
2505                 memset(dx_leaf, 0, osb->sb->s_blocksize);
2506                 strcpy(dx_leaf->dl_signature, OCFS2_DX_LEAF_SIGNATURE);
2507                 dx_leaf->dl_fs_generation = cpu_to_le32(osb->fs_generation);
2508                 dx_leaf->dl_blkno = cpu_to_le64(bh->b_blocknr);
2509                 dx_leaf->dl_list.de_count =
2510                         cpu_to_le16(ocfs2_dx_entries_per_leaf(osb->sb));
2511
2512                 mlog(0,
2513                      "Dir %llu, format dx_leaf: %llu, entry count: %u\n",
2514                      (unsigned long long)OCFS2_I(dir)->ip_blkno,
2515                      (unsigned long long)bh->b_blocknr,
2516                      le16_to_cpu(dx_leaf->dl_list.de_count));
2517
2518                 ocfs2_journal_dirty(handle, bh);
2519         }
2520
2521         ret = 0;
2522 out:
2523         return ret;
2524 }
2525
2526 /*
2527  * Allocates and formats a new cluster for use in an indexed dir
2528  * leaf. This version will not do the extent insert, so that it can be
2529  * used by operations which need careful ordering.
2530  */
2531 static int __ocfs2_dx_dir_new_cluster(struct inode *dir,
2532                                       u32 cpos, handle_t *handle,
2533                                       struct ocfs2_alloc_context *data_ac,
2534                                       struct buffer_head **dx_leaves,
2535                                       int num_dx_leaves, u64 *ret_phys_blkno)
2536 {
2537         int ret;
2538         u32 phys, num;
2539         u64 phys_blkno;
2540         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2541
2542         /*
2543          * XXX: For create, this should claim cluster for the index
2544          * *before* the unindexed insert so that we have a better
2545          * chance of contiguousness as the directory grows in number
2546          * of entries.
2547          */
2548         ret = __ocfs2_claim_clusters(handle, data_ac, 1, 1, &phys, &num);
2549         if (ret) {
2550                 mlog_errno(ret);
2551                 goto out;
2552         }
2553
2554         /*
2555          * Format the new cluster first. That way, we're inserting
2556          * valid data.
2557          */
2558         phys_blkno = ocfs2_clusters_to_blocks(osb->sb, phys);
2559         ret = ocfs2_dx_dir_format_cluster(osb, handle, dir, dx_leaves,
2560                                           num_dx_leaves, phys_blkno);
2561         if (ret) {
2562                 mlog_errno(ret);
2563                 goto out;
2564         }
2565
2566         *ret_phys_blkno = phys_blkno;
2567 out:
2568         return ret;
2569 }
2570
2571 static int ocfs2_dx_dir_new_cluster(struct inode *dir,
2572                                     struct ocfs2_extent_tree *et,
2573                                     u32 cpos, handle_t *handle,
2574                                     struct ocfs2_alloc_context *data_ac,
2575                                     struct ocfs2_alloc_context *meta_ac,
2576                                     struct buffer_head **dx_leaves,
2577                                     int num_dx_leaves)
2578 {
2579         int ret;
2580         u64 phys_blkno;
2581
2582         ret = __ocfs2_dx_dir_new_cluster(dir, cpos, handle, data_ac, dx_leaves,
2583                                          num_dx_leaves, &phys_blkno);
2584         if (ret) {
2585                 mlog_errno(ret);
2586                 goto out;
2587         }
2588
2589         ret = ocfs2_insert_extent(handle, et, cpos, phys_blkno, 1, 0,
2590                                   meta_ac);
2591         if (ret)
2592                 mlog_errno(ret);
2593 out:
2594         return ret;
2595 }
2596
2597 static struct buffer_head **ocfs2_dx_dir_kmalloc_leaves(struct super_block *sb,
2598                                                         int *ret_num_leaves)
2599 {
2600         int num_dx_leaves = ocfs2_clusters_to_blocks(sb, 1);
2601         struct buffer_head **dx_leaves;
2602
2603         dx_leaves = kcalloc(num_dx_leaves, sizeof(struct buffer_head *),
2604                             GFP_NOFS);
2605         if (dx_leaves && ret_num_leaves)
2606                 *ret_num_leaves = num_dx_leaves;
2607
2608         return dx_leaves;
2609 }
2610
2611 static int ocfs2_fill_new_dir_dx(struct ocfs2_super *osb,
2612                                  handle_t *handle,
2613                                  struct inode *parent,
2614                                  struct inode *inode,
2615                                  struct buffer_head *di_bh,
2616                                  struct ocfs2_alloc_context *data_ac,
2617                                  struct ocfs2_alloc_context *meta_ac)
2618 {
2619         int ret;
2620         struct buffer_head *leaf_bh = NULL;
2621         struct buffer_head *dx_root_bh = NULL;
2622         struct ocfs2_dx_hinfo hinfo;
2623         struct ocfs2_dx_root_block *dx_root;
2624         struct ocfs2_dx_entry_list *entry_list;
2625
2626         /*
2627          * Our strategy is to create the directory as though it were
2628          * unindexed, then add the index block. This works with very
2629          * little complication since the state of a new directory is a
2630          * very well known quantity.
2631          *
2632          * Essentially, we have two dirents ("." and ".."), in the 1st
2633          * block which need indexing. These are easily inserted into
2634          * the index block.
2635          */
2636
2637         ret = ocfs2_fill_new_dir_el(osb, handle, parent, inode, di_bh,
2638                                     data_ac, &leaf_bh);
2639         if (ret) {
2640                 mlog_errno(ret);
2641                 goto out;
2642         }
2643
2644         ret = ocfs2_dx_dir_attach_index(osb, handle, inode, di_bh, leaf_bh,
2645                                         meta_ac, 1, 2, &dx_root_bh);
2646         if (ret) {
2647                 mlog_errno(ret);
2648                 goto out;
2649         }
2650         dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
2651         entry_list = &dx_root->dr_entries;
2652
2653         /* Buffer has been journaled for us by ocfs2_dx_dir_attach_index */
2654         ocfs2_dx_dir_name_hash(inode, ".", 1, &hinfo);
2655         ocfs2_dx_entry_list_insert(entry_list, &hinfo, leaf_bh->b_blocknr);
2656
2657         ocfs2_dx_dir_name_hash(inode, "..", 2, &hinfo);
2658         ocfs2_dx_entry_list_insert(entry_list, &hinfo, leaf_bh->b_blocknr);
2659
2660 out:
2661         brelse(dx_root_bh);
2662         brelse(leaf_bh);
2663         return ret;
2664 }
2665
2666 int ocfs2_fill_new_dir(struct ocfs2_super *osb,
2667                        handle_t *handle,
2668                        struct inode *parent,
2669                        struct inode *inode,
2670                        struct buffer_head *fe_bh,
2671                        struct ocfs2_alloc_context *data_ac,
2672                        struct ocfs2_alloc_context *meta_ac)
2673
2674 {
2675         BUG_ON(!ocfs2_supports_inline_data(osb) && data_ac == NULL);
2676
2677         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2678                 return ocfs2_fill_new_dir_id(osb, handle, parent, inode, fe_bh);
2679
2680         if (ocfs2_supports_indexed_dirs(osb))
2681                 return ocfs2_fill_new_dir_dx(osb, handle, parent, inode, fe_bh,
2682                                              data_ac, meta_ac);
2683
2684         return ocfs2_fill_new_dir_el(osb, handle, parent, inode, fe_bh,
2685                                      data_ac, NULL);
2686 }
2687
2688 static int ocfs2_dx_dir_index_block(struct inode *dir,
2689                                     handle_t *handle,
2690                                     struct buffer_head **dx_leaves,
2691                                     int num_dx_leaves,
2692                                     u32 *num_dx_entries,
2693                                     struct buffer_head *dirent_bh)
2694 {
2695         int ret = 0, namelen, i;
2696         char *de_buf, *limit;
2697         struct ocfs2_dir_entry *de;
2698         struct buffer_head *dx_leaf_bh;
2699         struct ocfs2_dx_hinfo hinfo;
2700         u64 dirent_blk = dirent_bh->b_blocknr;
2701
2702         de_buf = dirent_bh->b_data;
2703         limit = de_buf + dir->i_sb->s_blocksize;
2704
2705         while (de_buf < limit) {
2706                 de = (struct ocfs2_dir_entry *)de_buf;
2707
2708                 namelen = de->name_len;
2709                 if (!namelen || !de->inode)
2710                         goto inc;
2711
2712                 ocfs2_dx_dir_name_hash(dir, de->name, namelen, &hinfo);
2713
2714                 i = ocfs2_dx_dir_hash_idx(OCFS2_SB(dir->i_sb), &hinfo);
2715                 dx_leaf_bh = dx_leaves[i];
2716
2717                 ret = __ocfs2_dx_dir_leaf_insert(dir, handle, &hinfo,
2718                                                  dirent_blk, dx_leaf_bh);
2719                 if (ret) {
2720                         mlog_errno(ret);
2721                         goto out;
2722                 }
2723
2724                 *num_dx_entries = *num_dx_entries + 1;
2725
2726 inc:
2727                 de_buf += le16_to_cpu(de->rec_len);
2728         }
2729
2730 out:
2731         return ret;
2732 }
2733
2734 /*
2735  * XXX: This expects dx_root_bh to already be part of the transaction.
2736  */
2737 static void ocfs2_dx_dir_index_root_block(struct inode *dir,
2738                                          struct buffer_head *dx_root_bh,
2739                                          struct buffer_head *dirent_bh)
2740 {
2741         char *de_buf, *limit;
2742         struct ocfs2_dx_root_block *dx_root;
2743         struct ocfs2_dir_entry *de;
2744         struct ocfs2_dx_hinfo hinfo;
2745         u64 dirent_blk = dirent_bh->b_blocknr;
2746
2747         dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
2748
2749         de_buf = dirent_bh->b_data;
2750         limit = de_buf + dir->i_sb->s_blocksize;
2751
2752         while (de_buf < limit) {
2753                 de = (struct ocfs2_dir_entry *)de_buf;
2754
2755                 if (!de->name_len || !de->inode)
2756                         goto inc;
2757
2758                 ocfs2_dx_dir_name_hash(dir, de->name, de->name_len, &hinfo);
2759
2760                 mlog(0,
2761                      "dir: %llu, major: 0x%x minor: 0x%x, index: %u, name: %.*s\n",
2762                      (unsigned long long)dir->i_ino, hinfo.major_hash,
2763                      hinfo.minor_hash,
2764                      le16_to_cpu(dx_root->dr_entries.de_num_used),
2765                      de->name_len, de->name);
2766
2767                 ocfs2_dx_entry_list_insert(&dx_root->dr_entries, &hinfo,
2768                                            dirent_blk);
2769
2770                 le32_add_cpu(&dx_root->dr_num_entries, 1);
2771 inc:
2772                 de_buf += le16_to_cpu(de->rec_len);
2773         }
2774 }
2775
2776 /*
2777  * Count the number of inline directory entries in di_bh and compare
2778  * them against the number of entries we can hold in an inline dx root
2779  * block.
2780  */
2781 static int ocfs2_new_dx_should_be_inline(struct inode *dir,
2782                                          struct buffer_head *di_bh)
2783 {
2784         int dirent_count = 0;
2785         char *de_buf, *limit;
2786         struct ocfs2_dir_entry *de;
2787         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2788
2789         de_buf = di->id2.i_data.id_data;
2790         limit = de_buf + i_size_read(dir);
2791
2792         while (de_buf < limit) {
2793                 de = (struct ocfs2_dir_entry *)de_buf;
2794
2795                 if (de->name_len && de->inode)
2796                         dirent_count++;
2797
2798                 de_buf += le16_to_cpu(de->rec_len);
2799         }
2800
2801         /* We are careful to leave room for one extra record. */
2802         return dirent_count < ocfs2_dx_entries_per_root(dir->i_sb);
2803 }
2804
2805 /*
2806  * Expand rec_len of the rightmost dirent in a directory block so that it
2807  * contains the end of our valid space for dirents. We do this during
2808  * expansion from an inline directory to one with extents. The first dir block
2809  * in that case is taken from the inline data portion of the inode block.
2810  *
2811  * This will also return the largest amount of contiguous space for a dirent
2812  * in the block. That value is *not* necessarily the last dirent, even after
2813  * expansion. The directory indexing code wants this value for free space
2814  * accounting. We do this here since we're already walking the entire dir
2815  * block.
2816  *
2817  * We add the dir trailer if this filesystem wants it.
2818  */
2819 static unsigned int ocfs2_expand_last_dirent(char *start, unsigned int old_size,
2820                                              struct inode *dir)
2821 {
2822         struct super_block *sb = dir->i_sb;
2823         struct ocfs2_dir_entry *de;
2824         struct ocfs2_dir_entry *prev_de;
2825         char *de_buf, *limit;
2826         unsigned int new_size = sb->s_blocksize;
2827         unsigned int bytes, this_hole;
2828         unsigned int largest_hole = 0;
2829
2830         if (ocfs2_new_dir_wants_trailer(dir))
2831                 new_size = ocfs2_dir_trailer_blk_off(sb);
2832
2833         bytes = new_size - old_size;
2834
2835         limit = start + old_size;
2836         de_buf = start;
2837         de = (struct ocfs2_dir_entry *)de_buf;
2838         do {
2839                 this_hole = ocfs2_figure_dirent_hole(de);
2840                 if (this_hole > largest_hole)
2841                         largest_hole = this_hole;
2842
2843                 prev_de = de;
2844                 de_buf += le16_to_cpu(de->rec_len);
2845                 de = (struct ocfs2_dir_entry *)de_buf;
2846         } while (de_buf < limit);
2847
2848         le16_add_cpu(&prev_de->rec_len, bytes);
2849
2850         /* We need to double check this after modification of the final
2851          * dirent. */
2852         this_hole = ocfs2_figure_dirent_hole(prev_de);
2853         if (this_hole > largest_hole)
2854                 largest_hole = this_hole;
2855
2856         if (largest_hole >= OCFS2_DIR_MIN_REC_LEN)
2857                 return largest_hole;
2858         return 0;
2859 }
2860
2861 /*
2862  * We allocate enough clusters to fulfill "blocks_wanted", but set
2863  * i_size to exactly one block. Ocfs2_extend_dir() will handle the
2864  * rest automatically for us.
2865  *
2866  * *first_block_bh is a pointer to the 1st data block allocated to the
2867  *  directory.
2868  */
2869 static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
2870                                    unsigned int blocks_wanted,
2871                                    struct ocfs2_dir_lookup_result *lookup,
2872                                    struct buffer_head **first_block_bh)
2873 {
2874         u32 alloc, dx_alloc, bit_off, len, num_dx_entries = 0;
2875         struct super_block *sb = dir->i_sb;
2876         int ret, i, num_dx_leaves = 0, dx_inline = 0,
2877                 credits = ocfs2_inline_to_extents_credits(sb);
2878         u64 dx_insert_blkno, blkno,
2879                 bytes = blocks_wanted << sb->s_blocksize_bits;
2880         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2881         struct ocfs2_inode_info *oi = OCFS2_I(dir);
2882         struct ocfs2_alloc_context *data_ac;
2883         struct ocfs2_alloc_context *meta_ac = NULL;
2884         struct buffer_head *dirdata_bh = NULL;
2885         struct buffer_head *dx_root_bh = NULL;
2886         struct buffer_head **dx_leaves = NULL;
2887         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2888         handle_t *handle;
2889         struct ocfs2_extent_tree et;
2890         struct ocfs2_extent_tree dx_et;
2891         int did_quota = 0, bytes_allocated = 0;
2892
2893         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(dir), di_bh);
2894
2895         alloc = ocfs2_clusters_for_bytes(sb, bytes);
2896         dx_alloc = 0;
2897
2898         down_write(&oi->ip_alloc_sem);
2899
2900         if (ocfs2_supports_indexed_dirs(osb)) {
2901                 credits += ocfs2_add_dir_index_credits(sb);
2902
2903                 dx_inline = ocfs2_new_dx_should_be_inline(dir, di_bh);
2904                 if (!dx_inline) {
2905                         /* Add one more cluster for an index leaf */
2906                         dx_alloc++;
2907                         dx_leaves = ocfs2_dx_dir_kmalloc_leaves(sb,
2908                                                                 &num_dx_leaves);
2909                         if (!dx_leaves) {
2910                                 ret = -ENOMEM;
2911                                 mlog_errno(ret);
2912                                 goto out;
2913                         }
2914                 }
2915
2916                 /* This gets us the dx_root */
2917                 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
2918                 if (ret) {
2919                         mlog_errno(ret);
2920                         goto out;
2921                 }
2922         }
2923
2924         /*
2925          * We should never need more than 2 clusters for the unindexed
2926          * tree - maximum dirent size is far less than one block. In
2927          * fact, the only time we'd need more than one cluster is if
2928          * blocksize == clustersize and the dirent won't fit in the
2929          * extra space that the expansion to a single block gives. As
2930          * of today, that only happens on 4k/4k file systems.
2931          */
2932         BUG_ON(alloc > 2);
2933
2934         ret = ocfs2_reserve_clusters(osb, alloc + dx_alloc, &data_ac);
2935         if (ret) {
2936                 mlog_errno(ret);
2937                 goto out;
2938         }
2939
2940         /*
2941          * Prepare for worst case allocation scenario of two separate
2942          * extents in the unindexed tree.
2943          */
2944         if (alloc == 2)
2945                 credits += OCFS2_SUBALLOC_ALLOC;
2946
2947         handle = ocfs2_start_trans(osb, credits);
2948         if (IS_ERR(handle)) {
2949                 ret = PTR_ERR(handle);
2950                 mlog_errno(ret);
2951                 goto out;
2952         }
2953
2954         ret = dquot_alloc_space_nodirty(dir,
2955                 ocfs2_clusters_to_bytes(osb->sb, alloc + dx_alloc));
2956         if (ret)
2957                 goto out_commit;
2958         did_quota = 1;
2959
2960         if (ocfs2_supports_indexed_dirs(osb) && !dx_inline) {
2961                 /*
2962                  * Allocate our index cluster first, to maximize the
2963                  * possibility that unindexed leaves grow
2964                  * contiguously.
2965                  */
2966                 ret = __ocfs2_dx_dir_new_cluster(dir, 0, handle, data_ac,
2967                                                  dx_leaves, num_dx_leaves,
2968                                                  &dx_insert_blkno);
2969                 if (ret) {
2970                         mlog_errno(ret);
2971                         goto out_commit;
2972                 }
2973                 bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1);
2974         }
2975
2976         /*
2977          * Try to claim as many clusters as the bitmap can give though
2978          * if we only get one now, that's enough to continue. The rest
2979          * will be claimed after the conversion to extents.
2980          */
2981         if (ocfs2_dir_resv_allowed(osb))
2982                 data_ac->ac_resv = &oi->ip_la_data_resv;
2983         ret = ocfs2_claim_clusters(handle, data_ac, 1, &bit_off, &len);
2984         if (ret) {
2985                 mlog_errno(ret);
2986                 goto out_commit;
2987         }
2988         bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1);
2989
2990         /*
2991          * Operations are carefully ordered so that we set up the new
2992          * data block first. The conversion from inline data to
2993          * extents follows.
2994          */
2995         blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off);
2996         dirdata_bh = sb_getblk(sb, blkno);
2997         if (!dirdata_bh) {
2998                 ret = -EIO;
2999                 mlog_errno(ret);
3000                 goto out_commit;
3001         }
3002
3003         ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), dirdata_bh);
3004
3005         ret = ocfs2_journal_access_db(handle, INODE_CACHE(dir), dirdata_bh,
3006                                       OCFS2_JOURNAL_ACCESS_CREATE);
3007         if (ret) {
3008                 mlog_errno(ret);
3009                 goto out_commit;
3010         }
3011
3012         memcpy(dirdata_bh->b_data, di->id2.i_data.id_data, i_size_read(dir));
3013         memset(dirdata_bh->b_data + i_size_read(dir), 0,
3014                sb->s_blocksize - i_size_read(dir));
3015         i = ocfs2_expand_last_dirent(dirdata_bh->b_data, i_size_read(dir), dir);
3016         if (ocfs2_new_dir_wants_trailer(dir)) {
3017                 /*
3018                  * Prepare the dir trailer up front. It will otherwise look
3019                  * like a valid dirent. Even if inserting the index fails
3020                  * (unlikely), then all we'll have done is given first dir
3021                  * block a small amount of fragmentation.
3022                  */
3023                 ocfs2_init_dir_trailer(dir, dirdata_bh, i);
3024         }
3025
3026         ocfs2_journal_dirty(handle, dirdata_bh);
3027
3028         if (ocfs2_supports_indexed_dirs(osb) && !dx_inline) {
3029                 /*
3030                  * Dx dirs with an external cluster need to do this up
3031                  * front. Inline dx root's get handled later, after
3032                  * we've allocated our root block. We get passed back
3033                  * a total number of items so that dr_num_entries can
3034                  * be correctly set once the dx_root has been
3035                  * allocated.
3036                  */
3037                 ret = ocfs2_dx_dir_index_block(dir, handle, dx_leaves,
3038                                                num_dx_leaves, &num_dx_entries,
3039                                                dirdata_bh);
3040                 if (ret) {
3041                         mlog_errno(ret);
3042                         goto out_commit;
3043                 }
3044         }
3045
3046         /*
3047          * Set extent, i_size, etc on the directory. After this, the
3048          * inode should contain the same exact dirents as before and
3049          * be fully accessible from system calls.
3050          *
3051          * We let the later dirent insert modify c/mtime - to the user
3052          * the data hasn't changed.
3053          */
3054         ret = ocfs2_journal_access_di(handle, INODE_CACHE(dir), di_bh,
3055                                       OCFS2_JOURNAL_ACCESS_CREATE);
3056         if (ret) {
3057                 mlog_errno(ret);
3058                 goto out_commit;
3059         }
3060
3061         spin_lock(&oi->ip_lock);
3062         oi->ip_dyn_features &= ~OCFS2_INLINE_DATA_FL;
3063         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
3064         spin_unlock(&oi->ip_lock);
3065
3066         ocfs2_dinode_new_extent_list(dir, di);
3067
3068         i_size_write(dir, sb->s_blocksize);
3069         dir->i_mtime = dir->i_ctime = CURRENT_TIME;
3070
3071         di->i_size = cpu_to_le64(sb->s_blocksize);
3072         di->i_ctime = di->i_mtime = cpu_to_le64(dir->i_ctime.tv_sec);
3073         di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(dir->i_ctime.tv_nsec);
3074
3075         /*
3076          * This should never fail as our extent list is empty and all
3077          * related blocks have been journaled already.
3078          */
3079         ret = ocfs2_insert_extent(handle, &et, 0, blkno, len,
3080                                   0, NULL);
3081         if (ret) {
3082                 mlog_errno(ret);
3083                 goto out_commit;
3084         }
3085
3086         /*
3087          * Set i_blocks after the extent insert for the most up to
3088          * date ip_clusters value.
3089          */
3090         dir->i_blocks = ocfs2_inode_sector_count(dir);
3091
3092         ocfs2_journal_dirty(handle, di_bh);
3093
3094         if (ocfs2_supports_indexed_dirs(osb)) {
3095                 ret = ocfs2_dx_dir_attach_index(osb, handle, dir, di_bh,
3096                                                 dirdata_bh, meta_ac, dx_inline,
3097                                                 num_dx_entries, &dx_root_bh);
3098                 if (ret) {
3099                         mlog_errno(ret);
3100                         goto out_commit;
3101                 }
3102
3103                 if (dx_inline) {
3104                         ocfs2_dx_dir_index_root_block(dir, dx_root_bh,
3105                                                       dirdata_bh);
3106                 } else {
3107                         ocfs2_init_dx_root_extent_tree(&dx_et,
3108                                                        INODE_CACHE(dir),
3109                                                        dx_root_bh);
3110                         ret = ocfs2_insert_extent(handle, &dx_et, 0,
3111                                                   dx_insert_blkno, 1, 0, NULL);
3112                         if (ret)
3113                                 mlog_errno(ret);
3114                 }
3115         }
3116
3117         /*
3118          * We asked for two clusters, but only got one in the 1st
3119          * pass. Claim the 2nd cluster as a separate extent.
3120          */
3121         if (alloc > len) {
3122                 ret = ocfs2_claim_clusters(handle, data_ac, 1, &bit_off,
3123                                            &len);
3124                 if (ret) {
3125                         mlog_errno(ret);
3126                         goto out_commit;
3127                 }
3128                 blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off);
3129
3130                 ret = ocfs2_insert_extent(handle, &et, 1,
3131                                           blkno, len, 0, NULL);
3132                 if (ret) {
3133                         mlog_errno(ret);
3134                         goto out_commit;
3135                 }
3136                 bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1);
3137         }
3138
3139         *first_block_bh = dirdata_bh;
3140         dirdata_bh = NULL;
3141         if (ocfs2_supports_indexed_dirs(osb)) {
3142                 unsigned int off;
3143
3144                 if (!dx_inline) {
3145                         /*
3146                          * We need to return the correct block within the
3147                          * cluster which should hold our entry.
3148                          */
3149                         off = ocfs2_dx_dir_hash_idx(OCFS2_SB(dir->i_sb),
3150                                                     &lookup->dl_hinfo);
3151                         get_bh(dx_leaves[off]);
3152                         lookup->dl_dx_leaf_bh = dx_leaves[off];
3153                 }
3154                 lookup->dl_dx_root_bh = dx_root_bh;
3155                 dx_root_bh = NULL;
3156         }
3157
3158 out_commit:
3159         if (ret < 0 && did_quota)
3160                 dquot_free_space_nodirty(dir, bytes_allocated);
3161
3162         ocfs2_commit_trans(osb, handle);
3163
3164 out:
3165         up_write(&oi->ip_alloc_sem);
3166         if (data_ac)
3167                 ocfs2_free_alloc_context(data_ac);
3168         if (meta_ac)
3169                 ocfs2_free_alloc_context(meta_ac);
3170
3171         if (dx_leaves) {
3172                 for (i = 0; i < num_dx_leaves; i++)
3173                         brelse(dx_leaves[i]);
3174                 kfree(dx_leaves);
3175         }
3176
3177         brelse(dirdata_bh);
3178         brelse(dx_root_bh);
3179
3180         return ret;
3181 }
3182
3183 /* returns a bh of the 1st new block in the allocation. */
3184 static int ocfs2_do_extend_dir(struct super_block *sb,
3185                                handle_t *handle,
3186                                struct inode *dir,
3187                                struct buffer_head *parent_fe_bh,
3188                                struct ocfs2_alloc_context *data_ac,
3189                                struct ocfs2_alloc_context *meta_ac,
3190                                struct buffer_head **new_bh)
3191 {
3192         int status;
3193         int extend, did_quota = 0;
3194         u64 p_blkno, v_blkno;
3195
3196         spin_lock(&OCFS2_I(dir)->ip_lock);
3197         extend = (i_size_read(dir) == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters));
3198         spin_unlock(&OCFS2_I(dir)->ip_lock);
3199
3200         if (extend) {
3201                 u32 offset = OCFS2_I(dir)->ip_clusters;
3202
3203                 status = dquot_alloc_space_nodirty(dir,
3204                                         ocfs2_clusters_to_bytes(sb, 1));
3205                 if (status)
3206                         goto bail;
3207                 did_quota = 1;
3208
3209                 status = ocfs2_add_inode_data(OCFS2_SB(sb), dir, &offset,
3210                                               1, 0, parent_fe_bh, handle,
3211                                               data_ac, meta_ac, NULL);
3212                 BUG_ON(status == -EAGAIN);
3213                 if (status < 0) {
3214                         mlog_errno(status);
3215                         goto bail;
3216                 }
3217         }
3218
3219         v_blkno = ocfs2_blocks_for_bytes(sb, i_size_read(dir));
3220         status = ocfs2_extent_map_get_blocks(dir, v_blkno, &p_blkno, NULL, NULL);
3221         if (status < 0) {
3222                 mlog_errno(status);
3223                 goto bail;
3224         }
3225
3226         *new_bh = sb_getblk(sb, p_blkno);
3227         if (!*new_bh) {
3228                 status = -EIO;
3229                 mlog_errno(status);
3230                 goto bail;
3231         }
3232         status = 0;
3233 bail:
3234         if (did_quota && status < 0)
3235                 dquot_free_space_nodirty(dir, ocfs2_clusters_to_bytes(sb, 1));
3236         mlog_exit(status);
3237         return status;
3238 }
3239
3240 /*
3241  * Assumes you already have a cluster lock on the directory.
3242  *
3243  * 'blocks_wanted' is only used if we have an inline directory which
3244  * is to be turned into an extent based one. The size of the dirent to
3245  * insert might be larger than the space gained by growing to just one
3246  * block, so we may have to grow the inode by two blocks in that case.
3247  *
3248  * If the directory is already indexed, dx_root_bh must be provided.
3249  */
3250 static int ocfs2_extend_dir(struct ocfs2_super *osb,
3251                             struct inode *dir,
3252                             struct buffer_head *parent_fe_bh,
3253                             unsigned int blocks_wanted,
3254                             struct ocfs2_dir_lookup_result *lookup,
3255                             struct buffer_head **new_de_bh)
3256 {
3257         int status = 0;
3258         int credits, num_free_extents, drop_alloc_sem = 0;
3259         loff_t dir_i_size;
3260         struct ocfs2_dinode *fe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
3261         struct ocfs2_extent_list *el = &fe->id2.i_list;
3262         struct ocfs2_alloc_context *data_ac = NULL;
3263         struct ocfs2_alloc_context *meta_ac = NULL;
3264         handle_t *handle = NULL;
3265         struct buffer_head *new_bh = NULL;
3266         struct ocfs2_dir_entry * de;
3267         struct super_block *sb = osb->sb;
3268         struct ocfs2_extent_tree et;
3269         struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh;
3270
3271         mlog_entry_void();
3272
3273         if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
3274                 /*
3275                  * This would be a code error as an inline directory should
3276                  * never have an index root.
3277                  */
3278                 BUG_ON(dx_root_bh);
3279
3280                 status = ocfs2_expand_inline_dir(dir, parent_fe_bh,
3281                                                  blocks_wanted, lookup,
3282                                                  &new_bh);
3283                 if (status) {
3284                         mlog_errno(status);
3285                         goto bail;
3286                 }
3287
3288                 /* Expansion from inline to an indexed directory will
3289                  * have given us this. */
3290                 dx_root_bh = lookup->dl_dx_root_bh;
3291
3292                 if (blocks_wanted == 1) {
3293                         /*
3294                          * If the new dirent will fit inside the space
3295                          * created by pushing out to one block, then
3296                          * we can complete the operation
3297                          * here. Otherwise we have to expand i_size
3298                          * and format the 2nd block below.
3299                          */
3300                         BUG_ON(new_bh == NULL);
3301                         goto bail_bh;
3302                 }
3303
3304                 /*
3305                  * Get rid of 'new_bh' - we want to format the 2nd
3306                  * data block and return that instead.
3307                  */
3308                 brelse(new_bh);
3309                 new_bh = NULL;
3310
3311                 down_write(&OCFS2_I(dir)->ip_alloc_sem);
3312                 drop_alloc_sem = 1;
3313                 dir_i_size = i_size_read(dir);
3314                 credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
3315                 goto do_extend;
3316         }
3317
3318         down_write(&OCFS2_I(dir)->ip_alloc_sem);
3319         drop_alloc_sem = 1;
3320         dir_i_size = i_size_read(dir);
3321         mlog(0, "extending dir %llu (i_size = %lld)\n",
3322              (unsigned long long)OCFS2_I(dir)->ip_blkno, dir_i_size);
3323
3324         /* dir->i_size is always block aligned. */
3325         spin_lock(&OCFS2_I(dir)->ip_lock);
3326         if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) {
3327                 spin_unlock(&OCFS2_I(dir)->ip_lock);
3328                 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(dir),
3329                                               parent_fe_bh);
3330                 num_free_extents = ocfs2_num_free_extents(osb, &et);
3331                 if (num_free_extents < 0) {
3332                         status = num_free_extents;
3333                         mlog_errno(status);
3334                         goto bail;
3335                 }
3336
3337                 if (!num_free_extents) {
3338                         status = ocfs2_reserve_new_metadata(osb, el, &meta_ac);
3339                         if (status < 0) {
3340                                 if (status != -ENOSPC)
3341                                         mlog_errno(status);
3342                                 goto bail;
3343                         }
3344                 }
3345
3346                 status = ocfs2_reserve_clusters(osb, 1, &data_ac);
3347                 if (status < 0) {
3348                         if (status != -ENOSPC)
3349                                 mlog_errno(status);
3350                         goto bail;
3351                 }
3352
3353                 if (ocfs2_dir_resv_allowed(osb))
3354                         data_ac->ac_resv = &OCFS2_I(dir)->ip_la_data_resv;
3355
3356                 credits = ocfs2_calc_extend_credits(sb, el, 1);
3357         } else {
3358                 spin_unlock(&OCFS2_I(dir)->ip_lock);
3359                 credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
3360         }
3361
3362 do_extend:
3363         if (ocfs2_dir_indexed(dir))
3364                 credits++; /* For attaching the new dirent block to the
3365                             * dx_root */
3366
3367         handle = ocfs2_start_trans(osb, credits);
3368         if (IS_ERR(handle)) {
3369                 status = PTR_ERR(handle);
3370                 handle = NULL;
3371                 mlog_errno(status);
3372                 goto bail;
3373         }
3374
3375         status = ocfs2_do_extend_dir(osb->sb, handle, dir, parent_fe_bh,
3376                                      data_ac, meta_ac, &new_bh);
3377         if (status < 0) {
3378                 mlog_errno(status);
3379                 goto bail;
3380         }
3381
3382         ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), new_bh);
3383
3384         status = ocfs2_journal_access_db(handle, INODE_CACHE(dir), new_bh,
3385                                          OCFS2_JOURNAL_ACCESS_CREATE);
3386         if (status < 0) {
3387                 mlog_errno(status);
3388                 goto bail;
3389         }
3390         memset(new_bh->b_data, 0, sb->s_blocksize);
3391
3392         de = (struct ocfs2_dir_entry *) new_bh->b_data;
3393         de->inode = 0;
3394         if (ocfs2_supports_dir_trailer(dir)) {
3395                 de->rec_len = cpu_to_le16(ocfs2_dir_trailer_blk_off(sb));
3396
3397                 ocfs2_init_dir_trailer(dir, new_bh, le16_to_cpu(de->rec_len));
3398
3399                 if (ocfs2_dir_indexed(dir)) {
3400                         status = ocfs2_dx_dir_link_trailer(dir, handle,
3401                                                            dx_root_bh, new_bh);
3402                         if (status) {
3403                                 mlog_errno(status);
3404                                 goto bail;
3405                         }
3406                 }
3407         } else {
3408                 de->rec_len = cpu_to_le16(sb->s_blocksize);
3409         }
3410         ocfs2_journal_dirty(handle, new_bh);
3411
3412         dir_i_size += dir->i_sb->s_blocksize;
3413         i_size_write(dir, dir_i_size);
3414         dir->i_blocks = ocfs2_inode_sector_count(dir);
3415         status = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh);
3416         if (status < 0) {
3417                 mlog_errno(status);
3418                 goto bail;
3419         }
3420
3421 bail_bh:
3422         *new_de_bh = new_bh;
3423         get_bh(*new_de_bh);
3424 bail:
3425         if (handle)
3426                 ocfs2_commit_trans(osb, handle);
3427         if (drop_alloc_sem)
3428                 up_write(&OCFS2_I(dir)->ip_alloc_sem);
3429
3430         if (data_ac)
3431                 ocfs2_free_alloc_context(data_ac);
3432         if (meta_ac)
3433                 ocfs2_free_alloc_context(meta_ac);
3434
3435         brelse(new_bh);
3436
3437         mlog_exit(status);
3438         return status;
3439 }
3440
3441 static int ocfs2_find_dir_space_id(struct inode *dir, struct buffer_head *di_bh,
3442                                    const char *name, int namelen,
3443                                    struct buffer_head **ret_de_bh,
3444                                    unsigned int *blocks_wanted)
3445 {
3446         int ret;
3447         struct super_block *sb = dir->i_sb;
3448         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3449         struct ocfs2_dir_entry *de, *last_de = NULL;
3450         char *de_buf, *limit;
3451         unsigned long offset = 0;
3452         unsigned int rec_len, new_rec_len, free_space = dir->i_sb->s_blocksize;
3453
3454         /*
3455          * This calculates how many free bytes we'd have in block zero, should
3456          * this function force expansion to an extent tree.
3457          */
3458         if (ocfs2_new_dir_wants_trailer(dir))
3459                 free_space = ocfs2_dir_trailer_blk_off(sb) - i_size_read(dir);
3460         else
3461                 free_space = dir->i_sb->s_blocksize - i_size_read(dir);
3462
3463         de_buf = di->id2.i_data.id_data;
3464         limit = de_buf + i_size_read(dir);
3465         rec_len = OCFS2_DIR_REC_LEN(namelen);
3466
3467         while (de_buf < limit) {
3468                 de = (struct ocfs2_dir_entry *)de_buf;
3469
3470                 if (!ocfs2_check_dir_entry(dir, de, di_bh, offset)) {
3471                         ret = -ENOENT;
3472                         goto out;
3473                 }
3474                 if (ocfs2_match(namelen, name, de)) {
3475                         ret = -EEXIST;
3476                         goto out;
3477                 }
3478                 /*
3479                  * No need to check for a trailing dirent record here as
3480                  * they're not used for inline dirs.
3481                  */
3482
3483                 if (ocfs2_dirent_would_fit(de, rec_len)) {
3484                         /* Ok, we found a spot. Return this bh and let
3485                          * the caller actually fill it in. */
3486                         *ret_de_bh = di_bh;
3487                         get_bh(*ret_de_bh);
3488                         ret = 0;
3489                         goto out;
3490                 }
3491
3492                 last_de = de;
3493                 de_buf += le16_to_cpu(de->rec_len);
3494                 offset += le16_to_cpu(de->rec_len);
3495         }
3496
3497         /*
3498          * We're going to require expansion of the directory - figure
3499          * out how many blocks we'll need so that a place for the
3500          * dirent can be found.
3501          */
3502         *blocks_wanted = 1;
3503         new_rec_len = le16_to_cpu(last_de->rec_len) + free_space;
3504         if (new_rec_len < (rec_len + OCFS2_DIR_REC_LEN(last_de->name_len)))
3505                 *blocks_wanted = 2;
3506
3507         ret = -ENOSPC;
3508 out:
3509         return ret;
3510 }
3511
3512 static int ocfs2_find_dir_space_el(struct inode *dir, const char *name,
3513                                    int namelen, struct buffer_head **ret_de_bh)
3514 {
3515         unsigned long offset;
3516         struct buffer_head *bh = NULL;
3517         unsigned short rec_len;
3518         struct ocfs2_dir_entry *de;
3519         struct super_block *sb = dir->i_sb;
3520         int status;
3521         int blocksize = dir->i_sb->s_blocksize;
3522
3523         status = ocfs2_read_dir_block(dir, 0, &bh, 0);
3524         if (status) {
3525                 mlog_errno(status);
3526                 goto bail;
3527         }
3528
3529         rec_len = OCFS2_DIR_REC_LEN(namelen);
3530         offset = 0;
3531         de = (struct ocfs2_dir_entry *) bh->b_data;
3532         while (1) {
3533                 if ((char *)de >= sb->s_blocksize + bh->b_data) {
3534                         brelse(bh);
3535                         bh = NULL;
3536
3537                         if (i_size_read(dir) <= offset) {
3538                                 /*
3539                                  * Caller will have to expand this
3540                                  * directory.
3541                                  */
3542                                 status = -ENOSPC;
3543                                 goto bail;
3544                         }
3545                         status = ocfs2_read_dir_block(dir,
3546                                              offset >> sb->s_blocksize_bits,
3547                                              &bh, 0);
3548                         if (status) {
3549                                 mlog_errno(status);
3550                                 goto bail;
3551                         }
3552                         /* move to next block */
3553                         de = (struct ocfs2_dir_entry *) bh->b_data;
3554                 }
3555                 if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
3556                         status = -ENOENT;
3557                         goto bail;
3558                 }
3559                 if (ocfs2_match(namelen, name, de)) {
3560                         status = -EEXIST;
3561                         goto bail;
3562                 }
3563
3564                 if (ocfs2_skip_dir_trailer(dir, de, offset % blocksize,
3565                                            blocksize))
3566                         goto next;
3567
3568                 if (ocfs2_dirent_would_fit(de, rec_len)) {
3569                         /* Ok, we found a spot. Return this bh and let
3570                          * the caller actually fill it in. */
3571                         *ret_de_bh = bh;
3572                         get_bh(*ret_de_bh);
3573                         status = 0;
3574                         goto bail;
3575                 }
3576 next:
3577                 offset += le16_to_cpu(de->rec_len);
3578                 de = (struct ocfs2_dir_entry *)((char *) de + le16_to_cpu(de->rec_len));
3579         }
3580
3581         status = 0;
3582 bail:
3583         brelse(bh);
3584
3585         mlog_exit(status);
3586         return status;
3587 }
3588
3589 static int dx_leaf_sort_cmp(const void *a, const void *b)
3590 {
3591         const struct ocfs2_dx_entry *entry1 = a;
3592         const struct ocfs2_dx_entry *entry2 = b;
3593         u32 major_hash1 = le32_to_cpu(entry1->dx_major_hash);
3594         u32 major_hash2 = le32_to_cpu(entry2->dx_major_hash);
3595         u32 minor_hash1 = le32_to_cpu(entry1->dx_minor_hash);
3596         u32 minor_hash2 = le32_to_cpu(entry2->dx_minor_hash);
3597
3598         if (major_hash1 > major_hash2)
3599                 return 1;
3600         if (major_hash1 < major_hash2)
3601                 return -1;
3602
3603         /*
3604          * It is not strictly necessary to sort by minor
3605          */
3606         if (minor_hash1 > minor_hash2)
3607                 return 1;
3608         if (minor_hash1 < minor_hash2)
3609                 return -1;
3610         return 0;
3611 }
3612
3613 static void dx_leaf_sort_swap(void *a, void *b, int size)
3614 {
3615         struct ocfs2_dx_entry *entry1 = a;
3616         struct ocfs2_dx_entry *entry2 = b;
3617         struct ocfs2_dx_entry tmp;
3618
3619         BUG_ON(size != sizeof(*entry1));
3620
3621         tmp = *entry1;
3622         *entry1 = *entry2;
3623         *entry2 = tmp;
3624 }
3625
3626 static int ocfs2_dx_leaf_same_major(struct ocfs2_dx_leaf *dx_leaf)
3627 {
3628         struct ocfs2_dx_entry_list *dl_list = &dx_leaf->dl_list;
3629         int i, num = le16_to_cpu(dl_list->de_num_used);
3630
3631         for (i = 0; i < (num - 1); i++) {
3632                 if (le32_to_cpu(dl_list->de_entries[i].dx_major_hash) !=
3633                     le32_to_cpu(dl_list->de_entries[i + 1].dx_major_hash))
3634                         return 0;
3635         }
3636
3637         return 1;
3638 }
3639
3640 /*
3641  * Find the optimal value to split this leaf on. This expects the leaf
3642  * entries to be in sorted order.
3643  *
3644  * leaf_cpos is the cpos of the leaf we're splitting. insert_hash is
3645  * the hash we want to insert.
3646  *
3647  * This function is only concerned with the major hash - that which
3648  * determines which cluster an item belongs to.
3649  */
3650 static int ocfs2_dx_dir_find_leaf_split(struct ocfs2_dx_leaf *dx_leaf,
3651                                         u32 leaf_cpos, u32 insert_hash,
3652                                         u32 *split_hash)
3653 {
3654         struct ocfs2_dx_entry_list *dl_list = &dx_leaf->dl_list;
3655         int i, num_used = le16_to_cpu(dl_list->de_num_used);
3656         int allsame;
3657
3658         /*
3659          * There's a couple rare, but nasty corner cases we have to
3660          * check for here. All of them involve a leaf where all value
3661          * have the same hash, which is what we look for first.
3662          *
3663          * Most of the time, all of the above is false, and we simply
3664          * pick the median value for a split.
3665          */
3666         allsame = ocfs2_dx_leaf_same_major(dx_leaf);
3667         if (allsame) {
3668                 u32 val = le32_to_cpu(dl_list->de_entries[0].dx_major_hash);
3669
3670                 if (val == insert_hash) {
3671                         /*
3672                          * No matter where we would choose to split,
3673                          * the new entry would want to occupy the same
3674                          * block as these. Since there's no space left
3675                          * in their existing block, we know there
3676                          * won't be space after the split.
3677                          */
3678                         return -ENOSPC;
3679                 }
3680
3681                 if (val == leaf_cpos) {
3682                         /*
3683                          * Because val is the same as leaf_cpos (which
3684                          * is the smallest value this leaf can have),
3685                          * yet is not equal to insert_hash, then we
3686                          * know that insert_hash *must* be larger than
3687                          * val (and leaf_cpos). At least cpos+1 in value.
3688                          *
3689                          * We also know then, that there cannot be an
3690                          * adjacent extent (otherwise we'd be looking
3691                          * at it). Choosing this value gives us a
3692                          * chance to get some contiguousness.
3693                          */
3694                         *split_hash = leaf_cpos + 1;
3695                         return 0;
3696                 }
3697
3698                 if (val > insert_hash) {
3699                         /*
3700                          * val can not be the same as insert hash, and
3701                          * also must be larger than leaf_cpos. Also,
3702                          * we know that there can't be a leaf between
3703                          * cpos and val, otherwise the entries with
3704                          * hash 'val' would be there.
3705                          */
3706                         *split_hash = val;
3707                         return 0;
3708                 }
3709
3710                 *split_hash = insert_hash;
3711                 return 0;
3712         }
3713
3714         /*
3715          * Since the records are sorted and the checks above
3716          * guaranteed that not all records in this block are the same,
3717          * we simple travel forward, from the median, and pick the 1st
3718          * record whose value is larger than leaf_cpos.
3719          */
3720         for (i = (num_used / 2); i < num_used; i++)
3721                 if (le32_to_cpu(dl_list->de_entries[i].dx_major_hash) >
3722                     leaf_cpos)
3723                         break;
3724
3725         BUG_ON(i == num_used); /* Should be impossible */
3726         *split_hash = le32_to_cpu(dl_list->de_entries[i].dx_major_hash);
3727         return 0;
3728 }
3729
3730 /*
3731  * Transfer all entries in orig_dx_leaves whose major hash is equal to or
3732  * larger than split_hash into new_dx_leaves. We use a temporary
3733  * buffer (tmp_dx_leaf) to make the changes to the original leaf blocks.
3734  *
3735  * Since the block offset inside a leaf (cluster) is a constant mask
3736  * of minor_hash, we can optimize - an item at block offset X within
3737  * the original cluster, will be at offset X within the new cluster.
3738  */
3739 static void ocfs2_dx_dir_transfer_leaf(struct inode *dir, u32 split_hash,
3740                                        handle_t *handle,
3741                                        struct ocfs2_dx_leaf *tmp_dx_leaf,
3742                                        struct buffer_head **orig_dx_leaves,
3743                                        struct buffer_head **new_dx_leaves,
3744                                        int num_dx_leaves)
3745 {
3746         int i, j, num_used;
3747         u32 major_hash;
3748         struct ocfs2_dx_leaf *orig_dx_leaf, *new_dx_leaf;
3749         struct ocfs2_dx_entry_list *orig_list, *new_list, *tmp_list;
3750         struct ocfs2_dx_entry *dx_entry;
3751
3752         tmp_list = &tmp_dx_leaf->dl_list;
3753
3754         for (i = 0; i < num_dx_leaves; i++) {
3755                 orig_dx_leaf = (struct ocfs2_dx_leaf *) orig_dx_leaves[i]->b_data;
3756                 orig_list = &orig_dx_leaf->dl_list;
3757                 new_dx_leaf = (struct ocfs2_dx_leaf *) new_dx_leaves[i]->b_data;
3758                 new_list = &new_dx_leaf->dl_list;
3759
3760                 num_used = le16_to_cpu(orig_list->de_num_used);
3761
3762                 memcpy(tmp_dx_leaf, orig_dx_leaf, dir->i_sb->s_blocksize);
3763                 tmp_list->de_num_used = cpu_to_le16(0);
3764                 memset(&tmp_list->de_entries, 0, sizeof(*dx_entry)*num_used);
3765
3766                 for (j = 0; j < num_used; j++) {
3767                         dx_entry = &orig_list->de_entries[j];
3768                         major_hash = le32_to_cpu(dx_entry->dx_major_hash);
3769                         if (major_hash >= split_hash)
3770                                 ocfs2_dx_dir_leaf_insert_tail(new_dx_leaf,
3771                                                               dx_entry);
3772                         else
3773                                 ocfs2_dx_dir_leaf_insert_tail(tmp_dx_leaf,
3774                                                               dx_entry);
3775                 }
3776                 memcpy(orig_dx_leaf, tmp_dx_leaf, dir->i_sb->s_blocksize);
3777
3778                 ocfs2_journal_dirty(handle, orig_dx_leaves[i]);
3779                 ocfs2_journal_dirty(handle, new_dx_leaves[i]);
3780         }
3781 }
3782
3783 static int ocfs2_dx_dir_rebalance_credits(struct ocfs2_super *osb,
3784                                           struct ocfs2_dx_root_block *dx_root)
3785 {
3786         int credits = ocfs2_clusters_to_blocks(osb->sb, 2);
3787
3788         credits += ocfs2_calc_extend_credits(osb->sb, &dx_root->dr_list, 1);
3789         credits += ocfs2_quota_trans_credits(osb->sb);
3790         return credits;
3791 }
3792
3793 /*
3794  * Find the median value in dx_leaf_bh and allocate a new leaf to move
3795  * half our entries into.
3796  */
3797 static int ocfs2_dx_dir_rebalance(struct ocfs2_super *osb, struct inode *dir,
3798                                   struct buffer_head *dx_root_bh,
3799                                   struct buffer_head *dx_leaf_bh,
3800                                   struct ocfs2_dx_hinfo *hinfo, u32 leaf_cpos,
3801                                   u64 leaf_blkno)
3802 {
3803         struct ocfs2_dx_leaf *dx_leaf = (struct ocfs2_dx_leaf *)dx_leaf_bh->b_data;
3804         int credits, ret, i, num_used, did_quota = 0;
3805         u32 cpos, split_hash, insert_hash = hinfo->major_hash;
3806         u64 orig_leaves_start;
3807         int num_dx_leaves;
3808         struct buffer_head **orig_dx_leaves = NULL;
3809         struct buffer_head **new_dx_leaves = NULL;
3810         struct ocfs2_alloc_context *data_ac = NULL, *meta_ac = NULL;
3811         struct ocfs2_extent_tree et;
3812         handle_t *handle = NULL;
3813         struct ocfs2_dx_root_block *dx_root;
3814         struct ocfs2_dx_leaf *tmp_dx_leaf = NULL;
3815
3816         mlog(0, "DX Dir: %llu, rebalance leaf leaf_blkno: %llu insert: %u\n",
3817              (unsigned long long)OCFS2_I(dir)->ip_blkno,
3818              (unsigned long long)leaf_blkno, insert_hash);
3819
3820         ocfs2_init_dx_root_extent_tree(&et, INODE_CACHE(dir), dx_root_bh);
3821
3822         dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
3823         /*
3824          * XXX: This is a rather large limit. We should use a more
3825          * realistic value.
3826          */
3827         if (le32_to_cpu(dx_root->dr_clusters) == UINT_MAX)
3828                 return -ENOSPC;
3829
3830         num_used = le16_to_cpu(dx_leaf->dl_list.de_num_used);
3831         if (num_used < le16_to_cpu(dx_leaf->dl_list.de_count)) {
3832                 mlog(ML_ERROR, "DX Dir: %llu, Asked to rebalance empty leaf: "
3833                      "%llu, %d\n", (unsigned long long)OCFS2_I(dir)->ip_blkno,
3834                      (unsigned long long)leaf_blkno, num_used);
3835                 ret = -EIO;
3836                 goto out;
3837         }
3838
3839         orig_dx_leaves = ocfs2_dx_dir_kmalloc_leaves(osb->sb, &num_dx_leaves);
3840         if (!orig_dx_leaves) {
3841                 ret = -ENOMEM;
3842                 mlog_errno(ret);
3843                 goto out;
3844         }
3845
3846         new_dx_leaves = ocfs2_dx_dir_kmalloc_leaves(osb->sb, NULL);
3847         if (!new_dx_leaves) {
3848                 ret = -ENOMEM;
3849                 mlog_errno(ret);
3850                 goto out;
3851         }
3852
3853         ret = ocfs2_lock_allocators(dir, &et, 1, 0, &data_ac, &meta_ac);
3854         if (ret) {
3855                 if (ret != -ENOSPC)
3856                         mlog_errno(ret);
3857                 goto out;
3858         }
3859
3860         credits = ocfs2_dx_dir_rebalance_credits(osb, dx_root);
3861         handle = ocfs2_start_trans(osb, credits);
3862         if (IS_ERR(handle)) {
3863                 ret = PTR_ERR(handle);
3864                 handle = NULL;
3865                 mlog_errno(ret);
3866                 goto out;
3867         }
3868
3869         ret = dquot_alloc_space_nodirty(dir,
3870                                        ocfs2_clusters_to_bytes(dir->i_sb, 1));
3871         if (ret)
3872                 goto out_commit;
3873         did_quota = 1;
3874
3875         ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), dx_leaf_bh,
3876                                       OCFS2_JOURNAL_ACCESS_WRITE);
3877         if (ret) {
3878                 mlog_errno(ret);
3879                 goto out_commit;
3880         }
3881
3882         /*
3883          * This block is changing anyway, so we can sort it in place.
3884          */
3885         sort(dx_leaf->dl_list.de_entries, num_used,
3886              sizeof(struct ocfs2_dx_entry), dx_leaf_sort_cmp,
3887              dx_leaf_sort_swap);
3888
3889         ocfs2_journal_dirty(handle, dx_leaf_bh);
3890
3891         ret = ocfs2_dx_dir_find_leaf_split(dx_leaf, leaf_cpos, insert_hash,
3892                                            &split_hash);
3893         if (ret) {
3894                 mlog_errno(ret);
3895                 goto  out_commit;
3896         }
3897
3898         mlog(0, "Split leaf (%u) at %u, insert major hash is %u\n",
3899              leaf_cpos, split_hash, insert_hash);
3900
3901         /*
3902          * We have to carefully order operations here. There are items
3903          * which want to be in the new cluster before insert, but in
3904          * order to put those items in the new cluster, we alter the
3905          * old cluster. A failure to insert gets nasty.
3906          *
3907          * So, start by reserving writes to the old
3908          * cluster. ocfs2_dx_dir_new_cluster will reserve writes on
3909          * the new cluster for us, before inserting it. The insert
3910          * won't happen if there's an error before that. Once the
3911          * insert is done then, we can transfer from one leaf into the
3912          * other without fear of hitting any error.
3913          */
3914
3915         /*
3916          * The leaf transfer wants some scratch space so that we don't
3917          * wind up doing a bunch of expensive memmove().
3918          */
3919         tmp_dx_leaf = kmalloc(osb->sb->s_blocksize, GFP_NOFS);
3920         if (!tmp_dx_leaf) {
3921                 ret = -ENOMEM;
3922                 mlog_errno(ret);
3923                 goto out_commit;
3924         }
3925
3926         orig_leaves_start = ocfs2_block_to_cluster_start(dir->i_sb, leaf_blkno);
3927         ret = ocfs2_read_dx_leaves(dir, orig_leaves_start, num_dx_leaves,
3928                                    orig_dx_leaves);
3929         if (ret) {
3930                 mlog_errno(ret);
3931                 goto out_commit;
3932         }
3933
3934         for (i = 0; i < num_dx_leaves; i++) {
3935                 ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir),
3936                                               orig_dx_leaves[i],
3937                                               OCFS2_JOURNAL_ACCESS_WRITE);
3938                 if (ret) {
3939                         mlog_errno(ret);
3940                         goto out_commit;
3941                 }
3942         }
3943
3944         cpos = split_hash;
3945         ret = ocfs2_dx_dir_new_cluster(dir, &et, cpos, handle,
3946                                        data_ac, meta_ac, new_dx_leaves,
3947                                        num_dx_leaves);
3948         if (ret) {
3949                 mlog_errno(ret);
3950                 goto out_commit;
3951         }
3952
3953         ocfs2_dx_dir_transfer_leaf(dir, split_hash, handle, tmp_dx_leaf,
3954                                    orig_dx_leaves, new_dx_leaves, num_dx_leaves);
3955
3956 out_commit:
3957         if (ret < 0 && did_quota)
3958                 dquot_free_space_nodirty(dir,
3959                                 ocfs2_clusters_to_bytes(dir->i_sb, 1));
3960
3961         ocfs2_commit_trans(osb, handle);
3962
3963 out:
3964         if (orig_dx_leaves || new_dx_leaves) {
3965                 for (i = 0; i < num_dx_leaves; i++) {
3966                         if (orig_dx_leaves)
3967                                 brelse(orig_dx_leaves[i]);
3968                         if (new_dx_leaves)
3969                                 brelse(new_dx_leaves[i]);
3970                 }
3971                 kfree(orig_dx_leaves);
3972                 kfree(new_dx_leaves);
3973         }
3974
3975         if (meta_ac)
3976                 ocfs2_free_alloc_context(meta_ac);
3977         if (data_ac)
3978                 ocfs2_free_alloc_context(data_ac);
3979
3980         kfree(tmp_dx_leaf);
3981         return ret;
3982 }
3983
3984 static int ocfs2_find_dir_space_dx(struct ocfs2_super *osb, struct inode *dir,
3985                                    struct buffer_head *di_bh,
3986                                    struct buffer_head *dx_root_bh,
3987                                    const char *name, int namelen,
3988                                    struct ocfs2_dir_lookup_result *lookup)
3989 {
3990         int ret, rebalanced = 0;
3991         struct ocfs2_dx_root_block *dx_root;
3992         struct buffer_head *dx_leaf_bh = NULL;
3993         struct ocfs2_dx_leaf *dx_leaf;
3994         u64 blkno;
3995         u32 leaf_cpos;
3996
3997         dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
3998
3999 restart_search:
4000         ret = ocfs2_dx_dir_lookup(dir, &dx_root->dr_list, &lookup->dl_hinfo,
4001                                   &leaf_cpos, &blkno);
4002         if (ret) {
4003                 mlog_errno(ret);
4004                 goto out;
4005         }
4006
4007         ret = ocfs2_read_dx_leaf(dir, blkno, &dx_leaf_bh);
4008         if (ret) {
4009                 mlog_errno(ret);
4010                 goto out;
4011         }
4012
4013         dx_leaf = (struct ocfs2_dx_leaf *)dx_leaf_bh->b_data;
4014
4015         if (le16_to_cpu(dx_leaf->dl_list.de_num_used) >=
4016             le16_to_cpu(dx_leaf->dl_list.de_count)) {
4017                 if (rebalanced) {
4018                         /*
4019                          * Rebalancing should have provided us with
4020                          * space in an appropriate leaf.
4021                          *
4022                          * XXX: Is this an abnormal condition then?
4023                          * Should we print a message here?
4024                          */
4025                         ret = -ENOSPC;
4026                         goto out;
4027                 }
4028
4029                 ret = ocfs2_dx_dir_rebalance(osb, dir, dx_root_bh, dx_leaf_bh,
4030                                              &lookup->dl_hinfo, leaf_cpos,
4031                                              blkno);
4032                 if (ret) {
4033                         if (ret != -ENOSPC)
4034                                 mlog_errno(ret);
4035                         goto out;
4036                 }
4037
4038                 /*
4039                  * Restart the lookup. The rebalance might have
4040                  * changed which block our item fits into. Mark our
4041                  * progress, so we only execute this once.
4042                  */
4043                 brelse(dx_leaf_bh);
4044                 dx_leaf_bh = NULL;
4045                 rebalanced = 1;
4046                 goto restart_search;
4047         }
4048
4049         lookup->dl_dx_leaf_bh = dx_leaf_bh;
4050         dx_leaf_bh = NULL;
4051
4052 out:
4053         brelse(dx_leaf_bh);
4054         return ret;
4055 }
4056
4057 static int ocfs2_search_dx_free_list(struct inode *dir,
4058                                      struct buffer_head *dx_root_bh,
4059                                      int namelen,
4060                                      struct ocfs2_dir_lookup_result *lookup)
4061 {
4062         int ret = -ENOSPC;
4063         struct buffer_head *leaf_bh = NULL, *prev_leaf_bh = NULL;
4064         struct ocfs2_dir_block_trailer *db;
4065         u64 next_block;
4066         int rec_len = OCFS2_DIR_REC_LEN(namelen);
4067         struct ocfs2_dx_root_block *dx_root;
4068
4069         dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
4070         next_block = le64_to_cpu(dx_root->dr_free_blk);
4071
4072         while (next_block) {
4073                 brelse(prev_leaf_bh);
4074                 prev_leaf_bh = leaf_bh;
4075                 leaf_bh = NULL;
4076
4077                 ret = ocfs2_read_dir_block_direct(dir, next_block, &leaf_bh);
4078                 if (ret) {
4079                         mlog_errno(ret);
4080                         goto out;
4081                 }
4082
4083                 db = ocfs2_trailer_from_bh(leaf_bh, dir->i_sb);
4084                 if (rec_len <= le16_to_cpu(db->db_free_rec_len)) {
4085                         lookup->dl_leaf_bh = leaf_bh;
4086                         lookup->dl_prev_leaf_bh = prev_leaf_bh;
4087                         leaf_bh = NULL;
4088                         prev_leaf_bh = NULL;
4089                         break;
4090                 }
4091
4092                 next_block = le64_to_cpu(db->db_free_next);
4093         }
4094
4095         if (!next_block)
4096                 ret = -ENOSPC;
4097
4098 out:
4099
4100         brelse(leaf_bh);
4101         brelse(prev_leaf_bh);
4102         return ret;
4103 }
4104
4105 static int ocfs2_expand_inline_dx_root(struct inode *dir,
4106                                        struct buffer_head *dx_root_bh)
4107 {
4108         int ret, num_dx_leaves, i, j, did_quota = 0;
4109         struct buffer_head **dx_leaves = NULL;
4110         struct ocfs2_extent_tree et;
4111         u64 insert_blkno;
4112         struct ocfs2_alloc_context *data_ac = NULL;
4113         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
4114         handle_t *handle = NULL;
4115         struct ocfs2_dx_root_block *dx_root;
4116         struct ocfs2_dx_entry_list *entry_list;
4117         struct ocfs2_dx_entry *dx_entry;
4118         struct ocfs2_dx_leaf *target_leaf;
4119
4120         ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
4121         if (ret) {
4122                 mlog_errno(ret);
4123                 goto out;
4124         }
4125
4126         dx_leaves = ocfs2_dx_dir_kmalloc_leaves(osb->sb, &num_dx_leaves);
4127         if (!dx_leaves) {
4128                 ret = -ENOMEM;
4129                 mlog_errno(ret);
4130                 goto out;
4131         }
4132
4133         handle = ocfs2_start_trans(osb, ocfs2_calc_dxi_expand_credits(osb->sb));
4134         if (IS_ERR(handle)) {
4135                 ret = PTR_ERR(handle);
4136                 mlog_errno(ret);
4137                 goto out;
4138         }
4139
4140         ret = dquot_alloc_space_nodirty(dir,
4141                                        ocfs2_clusters_to_bytes(osb->sb, 1));
4142         if (ret)
4143                 goto out_commit;
4144         did_quota = 1;
4145
4146         /*
4147          * We do this up front, before the allocation, so that a
4148          * failure to add the dx_root_bh to the journal won't result
4149          * us losing clusters.
4150          */
4151         ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh,
4152                                       OCFS2_JOURNAL_ACCESS_WRITE);
4153         if (ret) {
4154                 mlog_errno(ret);
4155                 goto out_commit;
4156         }
4157
4158         ret = __ocfs2_dx_dir_new_cluster(dir, 0, handle, data_ac, dx_leaves,
4159                                          num_dx_leaves, &insert_blkno);
4160         if (ret) {
4161                 mlog_errno(ret);
4162                 goto out_commit;
4163         }
4164
4165         /*
4166          * Transfer the entries from our dx_root into the appropriate
4167          * block
4168          */
4169         dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data;
4170         entry_list = &dx_root->dr_entries;
4171
4172         for (i = 0; i < le16_to_cpu(entry_list->de_num_used); i++) {
4173                 dx_entry = &entry_list->de_entries[i];
4174
4175                 j = __ocfs2_dx_dir_hash_idx(osb,
4176                                             le32_to_cpu(dx_entry->dx_minor_hash));
4177                 target_leaf = (struct ocfs2_dx_leaf *)dx_leaves[j]->b_data;
4178
4179                 ocfs2_dx_dir_leaf_insert_tail(target_leaf, dx_entry);
4180
4181                 /* Each leaf has been passed to the journal already
4182                  * via __ocfs2_dx_dir_new_cluster() */
4183         }
4184
4185         dx_root->dr_flags &= ~OCFS2_DX_FLAG_INLINE;
4186         memset(&dx_root->dr_list, 0, osb->sb->s_blocksize -
4187                offsetof(struct ocfs2_dx_root_block, dr_list));
4188         dx_root->dr_list.l_count =
4189                 cpu_to_le16(ocfs2_extent_recs_per_dx_root(osb->sb));
4190
4191         /* This should never fail considering we start with an empty
4192          * dx_root. */
4193         ocfs2_init_dx_root_extent_tree(&et, INODE_CACHE(dir), dx_root_bh);
4194         ret = ocfs2_insert_extent(handle, &et, 0, insert_blkno, 1, 0, NULL);
4195         if (ret)
4196                 mlog_errno(ret);
4197         did_quota = 0;
4198
4199         ocfs2_journal_dirty(handle, dx_root_bh);
4200
4201 out_commit:
4202         if (ret < 0 && did_quota)
4203                 dquot_free_space_nodirty(dir,
4204                                           ocfs2_clusters_to_bytes(dir->i_sb, 1));
4205
4206         ocfs2_commit_trans(osb, handle);
4207
4208 out:
4209         if (data_ac)
4210                 ocfs2_free_alloc_context(data_ac);
4211
4212         if (dx_leaves) {
4213                 for (i = 0; i < num_dx_leaves; i++)
4214                         brelse(dx_leaves[i]);
4215                 kfree(dx_leaves);
4216         }
4217         return ret;
4218 }
4219
4220 static int ocfs2_inline_dx_has_space(struct buffer_head *dx_root_bh)
4221 {
4222         struct ocfs2_dx_root_block *dx_root;
4223         struct ocfs2_dx_entry_list *entry_list;
4224
4225         dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data;
4226         entry_list = &dx_root->dr_entries;
4227
4228         if (le16_to_cpu(entry_list->de_num_used) >=
4229             le16_to_cpu(entry_list->de_count))
4230                 return -ENOSPC;
4231
4232         return 0;
4233 }
4234
4235 static int ocfs2_prepare_dx_dir_for_insert(struct inode *dir,
4236                                            struct buffer_head *di_bh,
4237                                            const char *name,
4238                                            int namelen,
4239                                            struct ocfs2_dir_lookup_result *lookup)
4240 {
4241         int ret, free_dx_root = 1;
4242         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
4243         struct buffer_head *dx_root_bh = NULL;
4244         struct buffer_head *leaf_bh = NULL;
4245         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
4246         struct ocfs2_dx_root_block *dx_root;
4247
4248         ret = ocfs2_read_dx_root(dir, di, &dx_root_bh);
4249         if (ret) {
4250                 mlog_errno(ret);
4251                 goto out;
4252         }
4253
4254         dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
4255         if (le32_to_cpu(dx_root->dr_num_entries) == OCFS2_DX_ENTRIES_MAX) {
4256                 ret = -ENOSPC;
4257                 mlog_errno(ret);
4258                 goto out;
4259         }
4260
4261         if (ocfs2_dx_root_inline(dx_root)) {
4262                 ret = ocfs2_inline_dx_has_space(dx_root_bh);
4263
4264                 if (ret == 0)
4265                         goto search_el;
4266
4267                 /*
4268                  * We ran out of room in the root block. Expand it to
4269                  * an extent, then allow ocfs2_find_dir_space_dx to do
4270                  * the rest.
4271                  */
4272                 ret = ocfs2_expand_inline_dx_root(dir, dx_root_bh);
4273                 if (ret) {
4274                         mlog_errno(ret);
4275                         goto out;
4276                 }
4277         }
4278
4279         /*
4280          * Insert preparation for an indexed directory is split into two
4281          * steps. The call to find_dir_space_dx reserves room in the index for
4282          * an additional item. If we run out of space there, it's a real error
4283          * we can't continue on.
4284          */
4285         ret = ocfs2_find_dir_space_dx(osb, dir, di_bh, dx_root_bh, name,
4286                                       namelen, lookup);
4287         if (ret) {
4288                 mlog_errno(ret);
4289                 goto out;
4290         }
4291
4292 search_el:
4293         /*
4294          * Next, we need to find space in the unindexed tree. This call
4295          * searches using the free space linked list. If the unindexed tree
4296          * lacks sufficient space, we'll expand it below. The expansion code
4297          * is smart enough to add any new blocks to the free space list.
4298          */
4299         ret = ocfs2_search_dx_free_list(dir, dx_root_bh, namelen, lookup);
4300         if (ret && ret != -ENOSPC) {
4301                 mlog_errno(ret);
4302                 goto out;
4303         }
4304
4305         /* Do this up here - ocfs2_extend_dir might need the dx_root */
4306         lookup->dl_dx_root_bh = dx_root_bh;
4307         free_dx_root = 0;
4308
4309         if (ret == -ENOSPC) {
4310                 ret = ocfs2_extend_dir(osb, dir, di_bh, 1, lookup, &leaf_bh);
4311
4312                 if (ret) {
4313                         mlog_errno(ret);
4314                         goto out;
4315                 }
4316
4317                 /*
4318                  * We make the assumption here that new leaf blocks are added
4319                  * to the front of our free list.
4320                  */
4321                 lookup->dl_prev_leaf_bh = NULL;
4322                 lookup->dl_leaf_bh = leaf_bh;
4323         }
4324
4325 out:
4326         if (free_dx_root)
4327                 brelse(dx_root_bh);
4328         return ret;
4329 }
4330
4331 /*
4332  * Get a directory ready for insert. Any directory allocation required
4333  * happens here. Success returns zero, and enough context in the dir
4334  * lookup result that ocfs2_add_entry() will be able complete the task
4335  * with minimal performance impact.
4336  */
4337 int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
4338                                  struct inode *dir,
4339                                  struct buffer_head *parent_fe_bh,
4340                                  const char *name,
4341                                  int namelen,
4342                                  struct ocfs2_dir_lookup_result *lookup)
4343 {
4344         int ret;
4345         unsigned int blocks_wanted = 1;
4346         struct buffer_head *bh = NULL;
4347
4348         mlog(0, "getting ready to insert namelen %d into dir %llu\n",
4349              namelen, (unsigned long long)OCFS2_I(dir)->ip_blkno);
4350
4351         if (!namelen) {
4352                 ret = -EINVAL;
4353                 mlog_errno(ret);
4354                 goto out;
4355         }
4356
4357         /*
4358          * Do this up front to reduce confusion.
4359          *
4360          * The directory might start inline, then be turned into an
4361          * indexed one, in which case we'd need to hash deep inside
4362          * ocfs2_find_dir_space_id(). Since
4363          * ocfs2_prepare_dx_dir_for_insert() also needs this hash
4364          * done, there seems no point in spreading out the calls. We
4365          * can optimize away the case where the file system doesn't
4366          * support indexing.
4367          */
4368         if (ocfs2_supports_indexed_dirs(osb))
4369                 ocfs2_dx_dir_name_hash(dir, name, namelen, &lookup->dl_hinfo);
4370
4371         if (ocfs2_dir_indexed(dir)) {
4372                 ret = ocfs2_prepare_dx_dir_for_insert(dir, parent_fe_bh,
4373                                                       name, namelen, lookup);
4374                 if (ret)
4375                         mlog_errno(ret);
4376                 goto out;
4377         }
4378
4379         if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
4380                 ret = ocfs2_find_dir_space_id(dir, parent_fe_bh, name,
4381                                               namelen, &bh, &blocks_wanted);
4382         } else
4383                 ret = ocfs2_find_dir_space_el(dir, name, namelen, &bh);
4384
4385         if (ret && ret != -ENOSPC) {
4386                 mlog_errno(ret);
4387                 goto out;
4388         }
4389
4390         if (ret == -ENOSPC) {
4391                 /*
4392                  * We have to expand the directory to add this name.
4393                  */
4394                 BUG_ON(bh);
4395
4396                 ret = ocfs2_extend_dir(osb, dir, parent_fe_bh, blocks_wanted,
4397                                        lookup, &bh);
4398                 if (ret) {
4399                         if (ret != -ENOSPC)
4400                                 mlog_errno(ret);
4401                         goto out;
4402                 }
4403
4404                 BUG_ON(!bh);
4405         }
4406
4407         lookup->dl_leaf_bh = bh;
4408         bh = NULL;
4409 out:
4410         brelse(bh);
4411         return ret;
4412 }
4413
4414 static int ocfs2_dx_dir_remove_index(struct inode *dir,
4415                                      struct buffer_head *di_bh,
4416                                      struct buffer_head *dx_root_bh)
4417 {
4418         int ret;
4419         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
4420         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
4421         struct ocfs2_dx_root_block *dx_root;
4422         struct inode *dx_alloc_inode = NULL;
4423         struct buffer_head *dx_alloc_bh = NULL;
4424         handle_t *handle;
4425         u64 blk;
4426         u16 bit;
4427         u64 bg_blkno;
4428
4429         dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data;
4430
4431         dx_alloc_inode = ocfs2_get_system_file_inode(osb,
4432                                         EXTENT_ALLOC_SYSTEM_INODE,
4433                                         le16_to_cpu(dx_root->dr_suballoc_slot));
4434         if (!dx_alloc_inode) {
4435                 ret = -ENOMEM;
4436                 mlog_errno(ret);
4437                 goto out;
4438         }
4439         mutex_lock(&dx_alloc_inode->i_mutex);
4440
4441         ret = ocfs2_inode_lock(dx_alloc_inode, &dx_alloc_bh, 1);
4442         if (ret) {
4443                 mlog_errno(ret);
4444                 goto out_mutex;
4445         }
4446
4447         handle = ocfs2_start_trans(osb, OCFS2_DX_ROOT_REMOVE_CREDITS);
4448         if (IS_ERR(handle)) {
4449                 ret = PTR_ERR(handle);
4450                 mlog_errno(ret);
4451                 goto out_unlock;
4452         }
4453
4454         ret = ocfs2_journal_access_di(handle, INODE_CACHE(dir), di_bh,
4455                                       OCFS2_JOURNAL_ACCESS_WRITE);
4456         if (ret) {
4457                 mlog_errno(ret);
4458                 goto out_commit;
4459         }
4460
4461         OCFS2_I(dir)->ip_dyn_features &= ~OCFS2_INDEXED_DIR_FL;
4462         di->i_dyn_features = cpu_to_le16(OCFS2_I(dir)->ip_dyn_features);
4463         di->i_dx_root = cpu_to_le64(0ULL);
4464
4465         ocfs2_journal_dirty(handle, di_bh);
4466
4467         blk = le64_to_cpu(dx_root->dr_blkno);
4468         bit = le16_to_cpu(dx_root->dr_suballoc_bit);
4469         if (dx_root->dr_suballoc_loc)
4470                 bg_blkno = le64_to_cpu(dx_root->dr_suballoc_loc);
4471         else
4472                 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
4473         ret = ocfs2_free_suballoc_bits(handle, dx_alloc_inode, dx_alloc_bh,
4474                                        bit, bg_blkno, 1);
4475         if (ret)
4476                 mlog_errno(ret);
4477
4478 out_commit:
4479         ocfs2_commit_trans(osb, handle);
4480
4481 out_unlock:
4482         ocfs2_inode_unlock(dx_alloc_inode, 1);
4483
4484 out_mutex:
4485         mutex_unlock(&dx_alloc_inode->i_mutex);
4486         brelse(dx_alloc_bh);
4487 out:
4488         iput(dx_alloc_inode);
4489         return ret;
4490 }
4491
4492 int ocfs2_dx_dir_truncate(struct inode *dir, struct buffer_head *di_bh)
4493 {
4494         int ret;
4495         unsigned int uninitialized_var(clen);
4496         u32 major_hash = UINT_MAX, p_cpos, uninitialized_var(cpos);
4497         u64 uninitialized_var(blkno);
4498         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
4499         struct buffer_head *dx_root_bh = NULL;
4500         struct ocfs2_dx_root_block *dx_root;
4501         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
4502         struct ocfs2_cached_dealloc_ctxt dealloc;
4503         struct ocfs2_extent_tree et;
4504
4505         ocfs2_init_dealloc_ctxt(&dealloc);
4506
4507         if (!ocfs2_dir_indexed(dir))
4508                 return 0;
4509
4510         ret = ocfs2_read_dx_root(dir, di, &dx_root_bh);
4511         if (ret) {
4512                 mlog_errno(ret);
4513                 goto out;
4514         }
4515         dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data;
4516
4517         if (ocfs2_dx_root_inline(dx_root))
4518                 goto remove_index;
4519
4520         ocfs2_init_dx_root_extent_tree(&et, INODE_CACHE(dir), dx_root_bh);
4521
4522         /* XXX: What if dr_clusters is too large? */
4523         while (le32_to_cpu(dx_root->dr_clusters)) {
4524                 ret = ocfs2_dx_dir_lookup_rec(dir, &dx_root->dr_list,
4525                                               major_hash, &cpos, &blkno, &clen);
4526                 if (ret) {
4527                         mlog_errno(ret);
4528                         goto out;
4529                 }
4530
4531                 p_cpos = ocfs2_blocks_to_clusters(dir->i_sb, blkno);
4532
4533                 ret = ocfs2_remove_btree_range(dir, &et, cpos, p_cpos, clen, 0,
4534                                                &dealloc, 0);
4535                 if (ret) {
4536                         mlog_errno(ret);
4537                         goto out;
4538                 }
4539
4540                 if (cpos == 0)
4541                         break;
4542
4543                 major_hash = cpos - 1;
4544         }
4545
4546 remove_index:
4547         ret = ocfs2_dx_dir_remove_index(dir, di_bh, dx_root_bh);
4548         if (ret) {
4549                 mlog_errno(ret);
4550                 goto out;
4551         }
4552
4553         ocfs2_remove_from_cache(INODE_CACHE(dir), dx_root_bh);
4554 out:
4555         ocfs2_schedule_truncate_log_flush(osb, 1);
4556         ocfs2_run_deallocs(osb, &dealloc);
4557
4558         brelse(dx_root_bh);
4559         return ret;
4560 }