fs/ufs/inode.c

   1 /*
   2  *  linux/fs/ufs/inode.c
   3  *
   4  * Copyright (C) 1998
   5  * Daniel Pirkl <daniel.pirkl@email.cz>
   6  * Charles University, Faculty of Mathematics and Physics
   7  *
   8  *  from
   9  *
  10  *  linux/fs/ext2/inode.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/inode.c
  20  *
  21  *  Copyright (C) 1991, 1992  Linus Torvalds
  22  *
  23  *  Goal-directed block allocation by Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
  24  *  Big-endian to little-endian byte-swapping/bitmaps by
  25  *        David S. Miller (davem@caip.rutgers.edu), 1995
  26  */
  27
  28 #include <linux/uaccess.h>
  29
  30 #include <linux/errno.h>
  31 #include <linux/fs.h>
  32 #include <linux/time.h>
  33 #include <linux/stat.h>
  34 #include <linux/string.h>
  35 #include <linux/mm.h>
  36 #include <linux/buffer_head.h>
  37 #include <linux/writeback.h>
  38
  39 #include "ufs_fs.h"
  40 #include "ufs.h"
  41 #include "swab.h"
  42 #include "util.h"
  43
  44 static int ufs_block_to_path(struct inode *inode, sector_t i_block, unsigned offsets[4])
  45 {
  46         struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
  47         int ptrs = uspi->s_apb;
  48         int ptrs_bits = uspi->s_apbshift;
  49         const long direct_blocks = UFS_NDADDR,
  50                 indirect_blocks = ptrs,
  51                 double_blocks = (1 << (ptrs_bits * 2));
  52         int n = 0;
  53
  54
  55         UFSD("ptrs=uspi->s_apb = %d,double_blocks=%ld \n",ptrs,double_blocks);
  56         if (i_block < direct_blocks) {
  57                 offsets[n++] = i_block;
  58         } else if ((i_block -= direct_blocks) < indirect_blocks) {
  59                 offsets[n++] = UFS_IND_BLOCK;
  60                 offsets[n++] = i_block;
  61         } else if ((i_block -= indirect_blocks) < double_blocks) {
  62                 offsets[n++] = UFS_DIND_BLOCK;
  63                 offsets[n++] = i_block >> ptrs_bits;
  64                 offsets[n++] = i_block & (ptrs - 1);
  65         } else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) {
  66                 offsets[n++] = UFS_TIND_BLOCK;
  67                 offsets[n++] = i_block >> (ptrs_bits * 2);
  68                 offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1);
  69                 offsets[n++] = i_block & (ptrs - 1);
  70         } else {
  71                 ufs_warning(inode->i_sb, "ufs_block_to_path", "block > big");
  72         }
  73         return n;
  74 }
  75
  76 typedef struct {
  77         void    *p;
  78         union {
  79                 __fs32  key32;
  80                 __fs64  key64;
  81         };
  82         struct buffer_head *bh;
  83 } Indirect;
  84
  85 static inline int grow_chain32(struct ufs_inode_info *ufsi,
  86                                struct buffer_head *bh, __fs32 *v,
  87                                Indirect *from, Indirect *to)
  88 {
  89         Indirect *p;
  90         unsigned seq;
  91         to->bh = bh;
  92         do {
  93                 seq = read_seqbegin(&ufsi->meta_lock);
  94                 to->key32 = *(__fs32 *)(to->p = v);
  95                 for (p = from; p <= to && p->key32 == *(__fs32 *)p->p; p++)
  96                         ;
  97         } while (read_seqretry(&ufsi->meta_lock, seq));
  98         return (p > to);
  99 }
 100
 101 static inline int grow_chain64(struct ufs_inode_info *ufsi,
 102                                struct buffer_head *bh, __fs64 *v,
 103                                Indirect *from, Indirect *to)
 104 {
 105         Indirect *p;
 106         unsigned seq;
 107         to->bh = bh;
 108         do {
 109                 seq = read_seqbegin(&ufsi->meta_lock);
 110                 to->key64 = *(__fs64 *)(to->p = v);
 111                 for (p = from; p <= to && p->key64 == *(__fs64 *)p->p; p++)
 112                         ;
 113         } while (read_seqretry(&ufsi->meta_lock, seq));
 114         return (p > to);
 115 }
 116
 117 /*
 118  * Returns the location of the fragment from
 119  * the beginning of the filesystem.
 120  */
 121
 122 static u64 ufs_frag_map(struct inode *inode, unsigned offsets[4], int depth)
 123 {
 124         struct ufs_inode_info *ufsi = UFS_I(inode);
 125         struct super_block *sb = inode->i_sb;
 126         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 127         u64 mask = (u64) uspi->s_apbmask>>uspi->s_fpbshift;
 128         int shift = uspi->s_apbshift-uspi->s_fpbshift;
 129         Indirect chain[4], *q = chain;
 130         unsigned *p;
 131         unsigned flags = UFS_SB(sb)->s_flags;
 132         u64 res = 0;
 133
 134         UFSD(": uspi->s_fpbshift = %d ,uspi->s_apbmask = %x, mask=%llx\n",
 135                 uspi->s_fpbshift, uspi->s_apbmask,
 136                 (unsigned long long)mask);
 137
 138         if (depth == 0)
 139                 goto no_block;
 140
 141 again:
 142         p = offsets;
 143
 144         if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 145                 goto ufs2;
 146
 147         if (!grow_chain32(ufsi, NULL, &ufsi->i_u1.i_data[*p++], chain, q))
 148                 goto changed;
 149         if (!q->key32)
 150                 goto no_block;
 151         while (--depth) {
 152                 __fs32 *ptr;
 153                 struct buffer_head *bh;
 154                 unsigned n = *p++;
 155
 156                 bh = sb_bread(sb, uspi->s_sbbase +
 157                                   fs32_to_cpu(sb, q->key32) + (n>>shift));
 158                 if (!bh)
 159                         goto no_block;
 160                 ptr = (__fs32 *)bh->b_data + (n & mask);
 161                 if (!grow_chain32(ufsi, bh, ptr, chain, ++q))
 162                         goto changed;
 163                 if (!q->key32)
 164                         goto no_block;
 165         }
 166         res = fs32_to_cpu(sb, q->key32);
 167         goto found;
 168
 169 ufs2:
 170         if (!grow_chain64(ufsi, NULL, &ufsi->i_u1.u2_i_data[*p++], chain, q))
 171                 goto changed;
 172         if (!q->key64)
 173                 goto no_block;
 174
 175         while (--depth) {
 176                 __fs64 *ptr;
 177                 struct buffer_head *bh;
 178                 unsigned n = *p++;
 179
 180                 bh = sb_bread(sb, uspi->s_sbbase +
 181                                   fs64_to_cpu(sb, q->key64) + (n>>shift));
 182                 if (!bh)
 183                         goto no_block;
 184                 ptr = (__fs64 *)bh->b_data + (n & mask);
 185                 if (!grow_chain64(ufsi, bh, ptr, chain, ++q))
 186                         goto changed;
 187                 if (!q->key64)
 188                         goto no_block;
 189         }
 190         res = fs64_to_cpu(sb, q->key64);
 191 found:
 192         res += uspi->s_sbbase;
 193 no_block:
 194         while (q > chain) {
 195                 brelse(q->bh);
 196                 q--;
 197         }
 198         return res;
 199
 200 changed:
 201         while (q > chain) {
 202                 brelse(q->bh);
 203                 q--;
 204         }
 205         goto again;
 206 }
 207
 208 /*
 209  * Unpacking tails: we have a file with partial final block and
 210  * we had been asked to extend it.  If the fragment being written
 211  * is within the same block, we need to extend the tail just to cover
 212  * that fragment.  Otherwise the tail is extended to full block.
 213  *
 214  * Note that we might need to create a _new_ tail, but that will
 215  * be handled elsewhere; this is strictly for resizing old
 216  * ones.
 217  */
 218 static bool
 219 ufs_extend_tail(struct inode *inode, u64 writes_to,
 220                   int *err, struct page *locked_page)
 221 {
 222         struct ufs_inode_info *ufsi = UFS_I(inode);
 223         struct super_block *sb = inode->i_sb;
 224         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 225         unsigned lastfrag = ufsi->i_lastfrag;   /* it's a short file, so unsigned is enough */
 226         unsigned block = ufs_fragstoblks(lastfrag);
 227         unsigned new_size;
 228         void *p;
 229         u64 tmp;
 230
 231         if (writes_to < (lastfrag | uspi->s_fpbmask))
 232                 new_size = (writes_to & uspi->s_fpbmask) + 1;
 233         else
 234                 new_size = uspi->s_fpb;
 235
 236         p = ufs_get_direct_data_ptr(uspi, ufsi, block);
 237         tmp = ufs_new_fragments(inode, p, lastfrag, ufs_data_ptr_to_cpu(sb, p),
 238                                 new_size - (lastfrag & uspi->s_fpbmask), err,
 239                                 locked_page);
 240         return tmp != 0;
 241 }
 242
 243 /**
 244  * ufs_inode_getfrag() - allocate new fragment(s)
 245  * @inode: pointer to inode
 246  * @index: number of block pointer within the inode's array.
 247  * @new_fragment: number of new allocated fragment(s)
 248  * @err: we set it if something wrong
 249  * @new: we set it if we allocate new block
 250  * @locked_page: for ufs_new_fragments()
 251  */
 252 static u64
 253 ufs_inode_getfrag(struct inode *inode, unsigned index,
 254                   sector_t new_fragment, int *err,
 255                   int *new, struct page *locked_page)
 256 {
 257         struct ufs_inode_info *ufsi = UFS_I(inode);
 258         struct super_block *sb = inode->i_sb;
 259         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 260         u64 tmp, goal, lastfrag;
 261         unsigned nfrags = uspi->s_fpb;
 262         void *p;
 263
 264         /* TODO : to be done for write support
 265         if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
 266              goto ufs2;
 267          */
 268
 269         p = ufs_get_direct_data_ptr(uspi, ufsi, index);
 270         tmp = ufs_data_ptr_to_cpu(sb, p);
 271         if (tmp)
 272                 goto out;
 273
 274         lastfrag = ufsi->i_lastfrag;
 275
 276         /* will that be a new tail? */
 277         if (new_fragment < UFS_NDIR_FRAGMENT && new_fragment >= lastfrag)
 278                 nfrags = (new_fragment & uspi->s_fpbmask) + 1;
 279
 280         goal = 0;
 281         if (index) {
 282                 goal = ufs_data_ptr_to_cpu(sb,
 283                                  ufs_get_direct_data_ptr(uspi, ufsi, index - 1));
 284                 if (goal)
 285                         goal += uspi->s_fpb;
 286         }
 287         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment),
 288                                 goal, nfrags, err, locked_page);
 289
 290         if (!tmp) {
 291                 *err = -ENOSPC;
 292                 return 0;
 293         }
 294
 295         if (new)
 296                 *new = 1;
 297         inode->i_ctime = current_time(inode);
 298         if (IS_SYNC(inode))
 299                 ufs_sync_inode (inode);
 300         mark_inode_dirty(inode);
 301 out:
 302         return tmp + uspi->s_sbbase;
 303
 304      /* This part : To be implemented ....
 305         Required only for writing, not required for READ-ONLY.
 306 ufs2:
 307
 308         u2_block = ufs_fragstoblks(fragment);
 309         u2_blockoff = ufs_fragnum(fragment);
 310         p = ufsi->i_u1.u2_i_data + block;
 311         goal = 0;
 312
 313 repeat2:
 314         tmp = fs32_to_cpu(sb, *p);
 315         lastfrag = ufsi->i_lastfrag;
 316
 317      */
 318 }
 319
 320 /**
 321  * ufs_inode_getblock() - allocate new block
 322  * @inode: pointer to inode
 323  * @ind_block: block number of the indirect block
 324  * @index: number of pointer within the indirect block
 325  * @new_fragment: number of new allocated fragment
 326  *  (block will hold this fragment and also uspi->s_fpb-1)
 327  * @err: see ufs_inode_getfrag()
 328  * @new: see ufs_inode_getfrag()
 329  * @locked_page: see ufs_inode_getfrag()
 330  */
 331 static u64
 332 ufs_inode_getblock(struct inode *inode, u64 ind_block,
 333                   unsigned index, sector_t new_fragment, int *err,
 334                   int *new, struct page *locked_page)
 335 {
 336         struct super_block *sb = inode->i_sb;
 337         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 338         int shift = uspi->s_apbshift - uspi->s_fpbshift;
 339         u64 tmp = 0, goal;
 340         struct buffer_head *bh;
 341         void *p;
 342
 343         if (!ind_block)
 344                 return 0;
 345
 346         bh = sb_bread(sb, ind_block + (index >> shift));
 347         if (unlikely(!bh)) {
 348                 *err = -EIO;
 349                 return 0;
 350         }
 351
 352         index &= uspi->s_apbmask >> uspi->s_fpbshift;
 353         if (uspi->fs_magic == UFS2_MAGIC)
 354                 p = (__fs64 *)bh->b_data + index;
 355         else
 356                 p = (__fs32 *)bh->b_data + index;
 357
 358         tmp = ufs_data_ptr_to_cpu(sb, p);
 359         if (tmp)
 360                 goto out;
 361
 362         if (index && (uspi->fs_magic == UFS2_MAGIC ?
 363                       (tmp = fs64_to_cpu(sb, ((__fs64 *)bh->b_data)[index-1])) :
 364                       (tmp = fs32_to_cpu(sb, ((__fs32 *)bh->b_data)[index-1]))))
 365                 goal = tmp + uspi->s_fpb;
 366         else
 367                 goal = bh->b_blocknr + uspi->s_fpb;
 368         tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
 369                                 uspi->s_fpb, err, locked_page);
 370         if (!tmp)
 371                 goto out;
 372
 373         if (new)
 374                 *new = 1;
 375
 376         mark_buffer_dirty(bh);
 377         if (IS_SYNC(inode))
 378                 sync_dirty_buffer(bh);
 379         inode->i_ctime = current_time(inode);
 380         mark_inode_dirty(inode);
 381 out:
 382         brelse (bh);
 383         UFSD("EXIT\n");
 384         if (tmp)
 385                 tmp += uspi->s_sbbase;
 386         return tmp;
 387 }
 388
 389 /**
 390  * ufs_getfrag_block() - `get_block_t' function, interface between UFS and
 391  * readpage, writepage and so on
 392  */
 393
 394 static int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
 395 {
 396         struct super_block *sb = inode->i_sb;
 397         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 398         int err = 0, new = 0;
 399         unsigned offsets[4];
 400         int depth = ufs_block_to_path(inode, fragment >> uspi->s_fpbshift, offsets);
 401         u64 phys64 = 0;
 402         unsigned frag = fragment & uspi->s_fpbmask;
 403
 404         if (!create) {
 405                 phys64 = ufs_frag_map(inode, offsets, depth);
 406                 if (phys64)
 407                         map_bh(bh_result, sb, phys64 + frag);
 408                 return 0;
 409         }
 410
 411         /* This code entered only while writing ....? */
 412
 413         mutex_lock(&UFS_I(inode)->truncate_mutex);
 414
 415         UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
 416         if (unlikely(!depth)) {
 417                 ufs_warning(sb, "ufs_get_block", "block > big");
 418                 err = -EIO;
 419                 goto out;
 420         }
 421
 422         if (UFS_I(inode)->i_lastfrag < UFS_NDIR_FRAGMENT) {
 423                 unsigned lastfrag = UFS_I(inode)->i_lastfrag;
 424                 unsigned tailfrags = lastfrag & uspi->s_fpbmask;
 425                 if (tailfrags && fragment >= lastfrag) {
 426                         if (!ufs_extend_tail(inode, fragment,
 427                                              &err, bh_result->b_page))
 428                                 goto out;
 429                 }
 430         }
 431
 432         if (depth == 1) {
 433                 phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
 434                                            &err, &new, bh_result->b_page);
 435         } else {
 436                 int i;
 437                 phys64 = ufs_inode_getfrag(inode, offsets[0], fragment,
 438                                            &err, NULL, NULL);
 439                 for (i = 1; i < depth - 1; i++)
 440                         phys64 = ufs_inode_getblock(inode, phys64, offsets[i],
 441                                                 fragment, &err, NULL, NULL);
 442                 phys64 = ufs_inode_getblock(inode, phys64, offsets[depth - 1],
 443                                         fragment, &err, &new, bh_result->b_page);
 444         }
 445 out:
 446         if (phys64) {
 447                 phys64 += frag;
 448                 map_bh(bh_result, sb, phys64);
 449                 if (new)
 450                         set_buffer_new(bh_result);
 451         }
 452         mutex_unlock(&UFS_I(inode)->truncate_mutex);
 453         return err;
 454 }
 455
 456 static int ufs_writepage(struct page *page, struct writeback_control *wbc)
 457 {
 458         return block_write_full_page(page,ufs_getfrag_block,wbc);
 459 }
 460
 461 static int ufs_readpage(struct file *file, struct page *page)
 462 {
 463         return block_read_full_page(page,ufs_getfrag_block);
 464 }
 465
 466 int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
 467 {
 468         return __block_write_begin(page, pos, len, ufs_getfrag_block);
 469 }
 470
 471 static void ufs_truncate_blocks(struct inode *);
 472
 473 static void ufs_write_failed(struct address_space *mapping, loff_t to)
 474 {
 475         struct inode *inode = mapping->host;
 476
 477         if (to > inode->i_size) {
 478                 truncate_pagecache(inode, inode->i_size);
 479                 ufs_truncate_blocks(inode);
 480         }
 481 }
 482
 483 static int ufs_write_begin(struct file *file, struct address_space *mapping,
 484                         loff_t pos, unsigned len, unsigned flags,
 485                         struct page **pagep, void **fsdata)
 486 {
 487         int ret;
 488
 489         ret = block_write_begin(mapping, pos, len, flags, pagep,
 490                                 ufs_getfrag_block);
 491         if (unlikely(ret))
 492                 ufs_write_failed(mapping, pos + len);
 493
 494         return ret;
 495 }
 496
 497 static int ufs_write_end(struct file *file, struct address_space *mapping,
 498                         loff_t pos, unsigned len, unsigned copied,
 499                         struct page *page, void *fsdata)
 500 {
 501         int ret;
 502
 503         ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
 504         if (ret < len)
 505                 ufs_write_failed(mapping, pos + len);
 506         return ret;
 507 }
 508
 509 static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 510 {
 511         return generic_block_bmap(mapping,block,ufs_getfrag_block);
 512 }
 513
 514 const struct address_space_operations ufs_aops = {
 515         .readpage = ufs_readpage,
 516         .writepage = ufs_writepage,
 517         .write_begin = ufs_write_begin,
 518         .write_end = ufs_write_end,
 519         .bmap = ufs_bmap
 520 };
 521
 522 static void ufs_set_inode_ops(struct inode *inode)
 523 {
 524         if (S_ISREG(inode->i_mode)) {
 525                 inode->i_op = &ufs_file_inode_operations;
 526                 inode->i_fop = &ufs_file_operations;
 527                 inode->i_mapping->a_ops = &ufs_aops;
 528         } else if (S_ISDIR(inode->i_mode)) {
 529                 inode->i_op = &ufs_dir_inode_operations;
 530                 inode->i_fop = &ufs_dir_operations;
 531                 inode->i_mapping->a_ops = &ufs_aops;
 532         } else if (S_ISLNK(inode->i_mode)) {
 533                 if (!inode->i_blocks) {
 534                         inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
 535                         inode->i_op = &simple_symlink_inode_operations;
 536                 } else {
 537                         inode->i_mapping->a_ops = &ufs_aops;
 538                         inode->i_op = &page_symlink_inode_operations;
 539                         inode_nohighmem(inode);
 540                 }
 541         } else
 542                 init_special_inode(inode, inode->i_mode,
 543                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 544 }
 545
 546 static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 547 {
 548         struct ufs_inode_info *ufsi = UFS_I(inode);
 549         struct super_block *sb = inode->i_sb;
 550         umode_t mode;
 551
 552         /*
 553          * Copy data to the in-core inode.
 554          */
 555         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 556         set_nlink(inode, fs16_to_cpu(sb, ufs_inode->ui_nlink));
 557         if (inode->i_nlink == 0) {
 558                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 559                 return -1;
 560         }
 561
 562         /*
 563          * Linux now has 32-bit uid and gid, so we can support EFT.
 564          */
 565         i_uid_write(inode, ufs_get_inode_uid(sb, ufs_inode));
 566         i_gid_write(inode, ufs_get_inode_gid(sb, ufs_inode));
 567
 568         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 569         inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 570         inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 571         inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 572         inode->i_mtime.tv_nsec = 0;
 573         inode->i_atime.tv_nsec = 0;
 574         inode->i_ctime.tv_nsec = 0;
 575         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 576         inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
 577         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 578         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 579         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 580
 581
 582         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 583                 memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
 584                        sizeof(ufs_inode->ui_u2.ui_addr));
 585         } else {
 586                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
 587                        sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
 588                 ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 589         }
 590         return 0;
 591 }
 592
 593 static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 594 {
 595         struct ufs_inode_info *ufsi = UFS_I(inode);
 596         struct super_block *sb = inode->i_sb;
 597         umode_t mode;
 598
 599         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 600         /*
 601          * Copy data to the in-core inode.
 602          */
 603         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 604         set_nlink(inode, fs16_to_cpu(sb, ufs2_inode->ui_nlink));
 605         if (inode->i_nlink == 0) {
 606                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 607                 return -1;
 608         }
 609
 610         /*
 611          * Linux now has 32-bit uid and gid, so we can support EFT.
 612          */
 613         i_uid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_uid));
 614         i_gid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_gid));
 615
 616         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 617         inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
 618         inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
 619         inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
 620         inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
 621         inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
 622         inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
 623         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 624         inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 625         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 626         /*
 627         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 628         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 629         */
 630
 631         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 632                 memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
 633                        sizeof(ufs2_inode->ui_u2.ui_addr));
 634         } else {
 635                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
 636                        sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
 637                 ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 638         }
 639         return 0;
 640 }
 641
 642 struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 643 {
 644         struct ufs_inode_info *ufsi;
 645         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 646         struct buffer_head * bh;
 647         struct inode *inode;
 648         int err;
 649
 650         UFSD("ENTER, ino %lu\n", ino);
 651
 652         if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
 653                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 654                             ino);
 655                 return ERR_PTR(-EIO);
 656         }
 657
 658         inode = iget_locked(sb, ino);
 659         if (!inode)
 660                 return ERR_PTR(-ENOMEM);
 661         if (!(inode->i_state & I_NEW))
 662                 return inode;
 663
 664         ufsi = UFS_I(inode);
 665
 666         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 667         if (!bh) {
 668                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 669                             inode->i_ino);
 670                 goto bad_inode;
 671         }
 672         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 673                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 674
 675                 err = ufs2_read_inode(inode,
 676                                       ufs2_inode + ufs_inotofsbo(inode->i_ino));
 677         } else {
 678                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 679
 680                 err = ufs1_read_inode(inode,
 681                                       ufs_inode + ufs_inotofsbo(inode->i_ino));
 682         }
 683
 684         if (err)
 685                 goto bad_inode;
 686         inode->i_version++;
 687         ufsi->i_lastfrag =
 688                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 689         ufsi->i_dir_start_lookup = 0;
 690         ufsi->i_osync = 0;
 691
 692         ufs_set_inode_ops(inode);
 693
 694         brelse(bh);
 695
 696         UFSD("EXIT\n");
 697         unlock_new_inode(inode);
 698         return inode;
 699
 700 bad_inode:
 701         iget_failed(inode);
 702         return ERR_PTR(-EIO);
 703 }
 704
 705 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 706 {
 707         struct super_block *sb = inode->i_sb;
 708         struct ufs_inode_info *ufsi = UFS_I(inode);
 709
 710         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 711         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 712
 713         ufs_set_inode_uid(sb, ufs_inode, i_uid_read(inode));
 714         ufs_set_inode_gid(sb, ufs_inode, i_gid_read(inode));
 715
 716         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 717         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 718         ufs_inode->ui_atime.tv_usec = 0;
 719         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 720         ufs_inode->ui_ctime.tv_usec = 0;
 721         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 722         ufs_inode->ui_mtime.tv_usec = 0;
 723         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 724         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 725         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 726
 727         if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
 728                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 729                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 730         }
 731
 732         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 733                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 734                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 735         } else if (inode->i_blocks) {
 736                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
 737                        sizeof(ufs_inode->ui_u2.ui_addr));
 738         }
 739         else {
 740                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 741                        sizeof(ufs_inode->ui_u2.ui_symlink));
 742         }
 743
 744         if (!inode->i_nlink)
 745                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 746 }
 747
 748 static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
 749 {
 750         struct super_block *sb = inode->i_sb;
 751         struct ufs_inode_info *ufsi = UFS_I(inode);
 752
 753         UFSD("ENTER\n");
 754         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 755         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 756
 757         ufs_inode->ui_uid = cpu_to_fs32(sb, i_uid_read(inode));
 758         ufs_inode->ui_gid = cpu_to_fs32(sb, i_gid_read(inode));
 759
 760         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 761         ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
 762         ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
 763         ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
 764         ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
 765         ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
 766         ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);
 767
 768         ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
 769         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 770         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 771
 772         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 773                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 774                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
 775         } else if (inode->i_blocks) {
 776                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
 777                        sizeof(ufs_inode->ui_u2.ui_addr));
 778         } else {
 779                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 780                        sizeof(ufs_inode->ui_u2.ui_symlink));
 781         }
 782
 783         if (!inode->i_nlink)
 784                 memset (ufs_inode, 0, sizeof(struct ufs2_inode));
 785         UFSD("EXIT\n");
 786 }
 787
 788 static int ufs_update_inode(struct inode * inode, int do_sync)
 789 {
 790         struct super_block *sb = inode->i_sb;
 791         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 792         struct buffer_head * bh;
 793
 794         UFSD("ENTER, ino %lu\n", inode->i_ino);
 795
 796         if (inode->i_ino < UFS_ROOTINO ||
 797             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 798                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 799                 return -1;
 800         }
 801
 802         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 803         if (!bh) {
 804                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 805                 return -1;
 806         }
 807         if (uspi->fs_magic == UFS2_MAGIC) {
 808                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 809
 810                 ufs2_update_inode(inode,
 811                                   ufs2_inode + ufs_inotofsbo(inode->i_ino));
 812         } else {
 813                 struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
 814
 815                 ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 816         }
 817
 818         mark_buffer_dirty(bh);
 819         if (do_sync)
 820                 sync_dirty_buffer(bh);
 821         brelse (bh);
 822
 823         UFSD("EXIT\n");
 824         return 0;
 825 }
 826
 827 int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
 828 {
 829         return ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 830 }
 831
 832 int ufs_sync_inode (struct inode *inode)
 833 {
 834         return ufs_update_inode (inode, 1);
 835 }
 836
 837 void ufs_evict_inode(struct inode * inode)
 838 {
 839         int want_delete = 0;
 840
 841         if (!inode->i_nlink && !is_bad_inode(inode))
 842                 want_delete = 1;
 843
 844         truncate_inode_pages_final(&inode->i_data);
 845         if (want_delete) {
 846                 inode->i_size = 0;
 847                 if (inode->i_blocks &&
 848                     (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 849                      S_ISLNK(inode->i_mode)))
 850                         ufs_truncate_blocks(inode);
 851                 ufs_update_inode(inode, inode_needs_sync(inode));
 852         }
 853
 854         invalidate_inode_buffers(inode);
 855         clear_inode(inode);
 856
 857         if (want_delete)
 858                 ufs_free_inode(inode);
 859 }
 860
 861 struct to_free {
 862         struct inode *inode;
 863         u64 to;
 864         unsigned count;
 865 };
 866
 867 static inline void free_data(struct to_free *ctx, u64 from, unsigned count)
 868 {
 869         if (ctx->count && ctx->to != from) {
 870                 ufs_free_blocks(ctx->inode, ctx->to - ctx->count, ctx->count);
 871                 ctx->count = 0;
 872         }
 873         ctx->count += count;
 874         ctx->to = from + count;
 875 }
 876
 877 #define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift)
 878 #define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
 879
 880 static void ufs_trunc_direct(struct inode *inode)
 881 {
 882         struct ufs_inode_info *ufsi = UFS_I(inode);
 883         struct super_block * sb;
 884         struct ufs_sb_private_info * uspi;
 885         void *p;
 886         u64 frag1, frag2, frag3, frag4, block1, block2;
 887         struct to_free ctx = {.inode = inode};
 888         unsigned i, tmp;
 889
 890         UFSD("ENTER: ino %lu\n", inode->i_ino);
 891
 892         sb = inode->i_sb;
 893         uspi = UFS_SB(sb)->s_uspi;
 894
 895         frag1 = DIRECT_FRAGMENT;
 896         frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
 897         frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
 898         frag3 = frag4 & ~uspi->s_fpbmask;
 899         block1 = block2 = 0;
 900         if (frag2 > frag3) {
 901                 frag2 = frag4;
 902                 frag3 = frag4 = 0;
 903         } else if (frag2 < frag3) {
 904                 block1 = ufs_fragstoblks (frag2);
 905                 block2 = ufs_fragstoblks (frag3);
 906         }
 907
 908         UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
 909              " frag3 %llu, frag4 %llu\n", inode->i_ino,
 910              (unsigned long long)frag1, (unsigned long long)frag2,
 911              (unsigned long long)block1, (unsigned long long)block2,
 912              (unsigned long long)frag3, (unsigned long long)frag4);
 913
 914         if (frag1 >= frag2)
 915                 goto next1;
 916
 917         /*
 918          * Free first free fragments
 919          */
 920         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
 921         tmp = ufs_data_ptr_to_cpu(sb, p);
 922         if (!tmp )
 923                 ufs_panic (sb, "ufs_trunc_direct", "internal error");
 924         frag2 -= frag1;
 925         frag1 = ufs_fragnum (frag1);
 926
 927         ufs_free_fragments(inode, tmp + frag1, frag2);
 928
 929 next1:
 930         /*
 931          * Free whole blocks
 932          */
 933         for (i = block1 ; i < block2; i++) {
 934                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
 935                 tmp = ufs_data_ptr_to_cpu(sb, p);
 936                 if (!tmp)
 937                         continue;
 938                 write_seqlock(&ufsi->meta_lock);
 939                 ufs_data_ptr_clear(uspi, p);
 940                 write_sequnlock(&ufsi->meta_lock);
 941
 942                 free_data(&ctx, tmp, uspi->s_fpb);
 943         }
 944
 945         free_data(&ctx, 0, 0);
 946
 947         if (frag3 >= frag4)
 948                 goto next3;
 949
 950         /*
 951          * Free last free fragments
 952          */
 953         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
 954         tmp = ufs_data_ptr_to_cpu(sb, p);
 955         if (!tmp )
 956                 ufs_panic(sb, "ufs_truncate_direct", "internal error");
 957         frag4 = ufs_fragnum (frag4);
 958         write_seqlock(&ufsi->meta_lock);
 959         ufs_data_ptr_clear(uspi, p);
 960         write_sequnlock(&ufsi->meta_lock);
 961
 962         ufs_free_fragments (inode, tmp, frag4);
 963  next3:
 964
 965         UFSD("EXIT: ino %lu\n", inode->i_ino);
 966 }
 967
 968 static void free_full_branch(struct inode *inode, u64 ind_block, int depth)
 969 {
 970         struct super_block *sb = inode->i_sb;
 971         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 972         struct ufs_buffer_head *ubh = ubh_bread(sb, ind_block, uspi->s_bsize);
 973         unsigned i;
 974
 975         if (!ubh)
 976                 return;
 977
 978         if (--depth) {
 979                 for (i = 0; i < uspi->s_apb; i++) {
 980                         void *p = ubh_get_data_ptr(uspi, ubh, i);
 981                         u64 block = ufs_data_ptr_to_cpu(sb, p);
 982                         if (block)
 983                                 free_full_branch(inode, block, depth);
 984                 }
 985         } else {
 986                 struct to_free ctx = {.inode = inode};
 987
 988                 for (i = 0; i < uspi->s_apb; i++) {
 989                         void *p = ubh_get_data_ptr(uspi, ubh, i);
 990                         u64 block = ufs_data_ptr_to_cpu(sb, p);
 991                         if (block)
 992                                 free_data(&ctx, block, uspi->s_fpb);
 993                 }
 994                 free_data(&ctx, 0, 0);
 995         }
 996
 997         ubh_bforget(ubh);
 998         ufs_free_blocks(inode, ind_block, uspi->s_fpb);
 999 }
1000
1001 static void free_branch_tail(struct inode *inode, unsigned from, struct ufs_buffer_head *ubh, int depth)
1002 {
1003         struct super_block *sb = inode->i_sb;
1004         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1005         unsigned i;
1006
1007         if (--depth) {
1008                 for (i = from; i < uspi->s_apb ; i++) {
1009                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1010                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1011                         if (block) {
1012                                 write_seqlock(&UFS_I(inode)->meta_lock);
1013                                 ufs_data_ptr_clear(uspi, p);
1014                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1015                                 ubh_mark_buffer_dirty(ubh);
1016                                 free_full_branch(inode, block, depth);
1017                         }
1018                 }
1019         } else {
1020                 struct to_free ctx = {.inode = inode};
1021
1022                 for (i = from; i < uspi->s_apb; i++) {
1023                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1024                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1025                         if (block) {
1026                                 write_seqlock(&UFS_I(inode)->meta_lock);
1027                                 ufs_data_ptr_clear(uspi, p);
1028                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1029                                 ubh_mark_buffer_dirty(ubh);
1030                                 free_data(&ctx, block, uspi->s_fpb);
1031                         }
1032                 }
1033                 free_data(&ctx, 0, 0);
1034         }
1035         if (IS_SYNC(inode) && ubh_buffer_dirty(ubh))
1036                 ubh_sync_block(ubh);
1037         ubh_brelse(ubh);
1038 }
1039
1040 static int ufs_alloc_lastblock(struct inode *inode, loff_t size)
1041 {
1042         int err = 0;
1043         struct super_block *sb = inode->i_sb;
1044         struct address_space *mapping = inode->i_mapping;
1045         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1046         unsigned i, end;
1047         sector_t lastfrag;
1048         struct page *lastpage;
1049         struct buffer_head *bh;
1050         u64 phys64;
1051
1052         lastfrag = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
1053
1054         if (!lastfrag)
1055                 goto out;
1056
1057         lastfrag--;
1058
1059         lastpage = ufs_get_locked_page(mapping, lastfrag >>
1060                                        (PAGE_SHIFT - inode->i_blkbits));
1061        if (IS_ERR(lastpage)) {
1062                err = -EIO;
1063                goto out;
1064        }
1065
1066        end = lastfrag & ((1 << (PAGE_SHIFT - inode->i_blkbits)) - 1);
1067        bh = page_buffers(lastpage);
1068        for (i = 0; i < end; ++i)
1069                bh = bh->b_this_page;
1070
1071
1072        err = ufs_getfrag_block(inode, lastfrag, bh, 1);
1073
1074        if (unlikely(err))
1075                goto out_unlock;
1076
1077        if (buffer_new(bh)) {
1078                clear_buffer_new(bh);
1079                clean_bdev_bh_alias(bh);
1080                /*
1081                 * we do not zeroize fragment, because of
1082                 * if it maped to hole, it already contains zeroes
1083                 */
1084                set_buffer_uptodate(bh);
1085                mark_buffer_dirty(bh);
1086                set_page_dirty(lastpage);
1087        }
1088
1089        if (lastfrag >= UFS_IND_FRAGMENT) {
1090                end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
1091                phys64 = bh->b_blocknr + 1;
1092                for (i = 0; i < end; ++i) {
1093                        bh = sb_getblk(sb, i + phys64);
1094                        lock_buffer(bh);
1095                        memset(bh->b_data, 0, sb->s_blocksize);
1096                        set_buffer_uptodate(bh);
1097                        mark_buffer_dirty(bh);
1098                        unlock_buffer(bh);
1099                        sync_dirty_buffer(bh);
1100                        brelse(bh);
1101                }
1102        }
1103 out_unlock:
1104        ufs_put_locked_page(lastpage);
1105 out:
1106        return err;
1107 }
1108
1109 static void ufs_truncate_blocks(struct inode *inode)
1110 {
1111         struct ufs_inode_info *ufsi = UFS_I(inode);
1112         struct super_block *sb = inode->i_sb;
1113         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1114         unsigned offsets[4];
1115         int depth = ufs_block_to_path(inode, DIRECT_BLOCK, offsets);
1116         int depth2;
1117         unsigned i;
1118         struct ufs_buffer_head *ubh[3];
1119         void *p;
1120         u64 block;
1121
1122         if (!depth)
1123                 return;
1124
1125         /* find the last non-zero in offsets[] */
1126         for (depth2 = depth - 1; depth2; depth2--)
1127                 if (offsets[depth2])
1128                         break;
1129
1130         mutex_lock(&ufsi->truncate_mutex);
1131         if (depth == 1) {
1132                 ufs_trunc_direct(inode);
1133                 offsets[0] = UFS_IND_BLOCK;
1134         } else {
1135                 /* get the blocks that should be partially emptied */
1136                 p = ufs_get_direct_data_ptr(uspi, ufsi, offsets[0]);
1137                 for (i = 0; i < depth2; i++) {
1138                         offsets[i]++;   /* next branch is fully freed */
1139                         block = ufs_data_ptr_to_cpu(sb, p);
1140                         if (!block)
1141                                 break;
1142                         ubh[i] = ubh_bread(sb, block, uspi->s_bsize);
1143                         if (!ubh[i]) {
1144                                 write_seqlock(&ufsi->meta_lock);
1145                                 ufs_data_ptr_clear(uspi, p);
1146                                 write_sequnlock(&ufsi->meta_lock);
1147                                 break;
1148                         }
1149                         p = ubh_get_data_ptr(uspi, ubh[i], offsets[i + 1]);
1150                 }
1151                 while (i--)
1152                         free_branch_tail(inode, offsets[i + 1], ubh[i], depth - i - 1);
1153         }
1154         for (i = offsets[0]; i <= UFS_TIND_BLOCK; i++) {
1155                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
1156                 block = ufs_data_ptr_to_cpu(sb, p);
1157                 if (block) {
1158                         write_seqlock(&ufsi->meta_lock);
1159                         ufs_data_ptr_clear(uspi, p);
1160                         write_sequnlock(&ufsi->meta_lock);
1161                         free_full_branch(inode, block, i - UFS_IND_BLOCK + 1);
1162                 }
1163         }
1164         ufsi->i_lastfrag = DIRECT_FRAGMENT;
1165         mark_inode_dirty(inode);
1166         mutex_unlock(&ufsi->truncate_mutex);
1167 }
1168
1169 static int ufs_truncate(struct inode *inode, loff_t size)
1170 {
1171         int err = 0;
1172
1173         UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
1174              inode->i_ino, (unsigned long long)size,
1175              (unsigned long long)i_size_read(inode));
1176
1177         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1178               S_ISLNK(inode->i_mode)))
1179                 return -EINVAL;
1180         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1181                 return -EPERM;
1182
1183         err = ufs_alloc_lastblock(inode, size);
1184
1185         if (err)
1186                 goto out;
1187
1188         block_truncate_page(inode->i_mapping, size, ufs_getfrag_block);
1189
1190         truncate_setsize(inode, size);
1191
1192         ufs_truncate_blocks(inode);
1193         inode->i_mtime = inode->i_ctime = current_time(inode);
1194         mark_inode_dirty(inode);
1195 out:
1196         UFSD("EXIT: err %d\n", err);
1197         return err;
1198 }
1199
1200 int ufs_setattr(struct dentry *dentry, struct iattr *attr)
1201 {
1202         struct inode *inode = d_inode(dentry);
1203         unsigned int ia_valid = attr->ia_valid;
1204         int error;
1205
1206         error = setattr_prepare(dentry, attr);
1207         if (error)
1208                 return error;
1209
1210         if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
1211                 error = ufs_truncate(inode, attr->ia_size);
1212                 if (error)
1213                         return error;
1214         }
1215
1216         setattr_copy(inode, attr);
1217         mark_inode_dirty(inode);
1218         return 0;
1219 }
1220
1221 const struct inode_operations ufs_file_inode_operations = {
1222         .setattr = ufs_setattr,
1223 };