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 <asm/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_SEC;
 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_SEC;
 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_op = &ufs_fast_symlink_inode_operations;
 535                         inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
 536                 } else {
 537                         inode->i_op = &ufs_symlink_inode_operations;
 538                         inode->i_mapping->a_ops = &ufs_aops;
 539                 }
 540         } else
 541                 init_special_inode(inode, inode->i_mode,
 542                                    ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
 543 }
 544
 545 static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 546 {
 547         struct ufs_inode_info *ufsi = UFS_I(inode);
 548         struct super_block *sb = inode->i_sb;
 549         umode_t mode;
 550
 551         /*
 552          * Copy data to the in-core inode.
 553          */
 554         inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
 555         set_nlink(inode, fs16_to_cpu(sb, ufs_inode->ui_nlink));
 556         if (inode->i_nlink == 0) {
 557                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 558                 return -1;
 559         }
 560
 561         /*
 562          * Linux now has 32-bit uid and gid, so we can support EFT.
 563          */
 564         i_uid_write(inode, ufs_get_inode_uid(sb, ufs_inode));
 565         i_gid_write(inode, ufs_get_inode_gid(sb, ufs_inode));
 566
 567         inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
 568         inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
 569         inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
 570         inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
 571         inode->i_mtime.tv_nsec = 0;
 572         inode->i_atime.tv_nsec = 0;
 573         inode->i_ctime.tv_nsec = 0;
 574         inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
 575         inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
 576         ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
 577         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 578         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 579
 580
 581         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 582                 memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
 583                        sizeof(ufs_inode->ui_u2.ui_addr));
 584         } else {
 585                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
 586                        sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
 587                 ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 588         }
 589         return 0;
 590 }
 591
 592 static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 593 {
 594         struct ufs_inode_info *ufsi = UFS_I(inode);
 595         struct super_block *sb = inode->i_sb;
 596         umode_t mode;
 597
 598         UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
 599         /*
 600          * Copy data to the in-core inode.
 601          */
 602         inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
 603         set_nlink(inode, fs16_to_cpu(sb, ufs2_inode->ui_nlink));
 604         if (inode->i_nlink == 0) {
 605                 ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
 606                 return -1;
 607         }
 608
 609         /*
 610          * Linux now has 32-bit uid and gid, so we can support EFT.
 611          */
 612         i_uid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_uid));
 613         i_gid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_gid));
 614
 615         inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
 616         inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
 617         inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
 618         inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
 619         inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
 620         inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
 621         inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
 622         inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
 623         inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
 624         ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
 625         /*
 626         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
 627         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
 628         */
 629
 630         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
 631                 memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
 632                        sizeof(ufs2_inode->ui_u2.ui_addr));
 633         } else {
 634                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
 635                        sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
 636                 ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 637         }
 638         return 0;
 639 }
 640
 641 struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 642 {
 643         struct ufs_inode_info *ufsi;
 644         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 645         struct buffer_head * bh;
 646         struct inode *inode;
 647         int err;
 648
 649         UFSD("ENTER, ino %lu\n", ino);
 650
 651         if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
 652                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
 653                             ino);
 654                 return ERR_PTR(-EIO);
 655         }
 656
 657         inode = iget_locked(sb, ino);
 658         if (!inode)
 659                 return ERR_PTR(-ENOMEM);
 660         if (!(inode->i_state & I_NEW))
 661                 return inode;
 662
 663         ufsi = UFS_I(inode);
 664
 665         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
 666         if (!bh) {
 667                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
 668                             inode->i_ino);
 669                 goto bad_inode;
 670         }
 671         if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
 672                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 673
 674                 err = ufs2_read_inode(inode,
 675                                       ufs2_inode + ufs_inotofsbo(inode->i_ino));
 676         } else {
 677                 struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
 678
 679                 err = ufs1_read_inode(inode,
 680                                       ufs_inode + ufs_inotofsbo(inode->i_ino));
 681         }
 682
 683         if (err)
 684                 goto bad_inode;
 685         inode->i_version++;
 686         ufsi->i_lastfrag =
 687                 (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
 688         ufsi->i_dir_start_lookup = 0;
 689         ufsi->i_osync = 0;
 690
 691         ufs_set_inode_ops(inode);
 692
 693         brelse(bh);
 694
 695         UFSD("EXIT\n");
 696         unlock_new_inode(inode);
 697         return inode;
 698
 699 bad_inode:
 700         iget_failed(inode);
 701         return ERR_PTR(-EIO);
 702 }
 703
 704 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 705 {
 706         struct super_block *sb = inode->i_sb;
 707         struct ufs_inode_info *ufsi = UFS_I(inode);
 708
 709         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 710         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 711
 712         ufs_set_inode_uid(sb, ufs_inode, i_uid_read(inode));
 713         ufs_set_inode_gid(sb, ufs_inode, i_gid_read(inode));
 714
 715         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 716         ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
 717         ufs_inode->ui_atime.tv_usec = 0;
 718         ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
 719         ufs_inode->ui_ctime.tv_usec = 0;
 720         ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
 721         ufs_inode->ui_mtime.tv_usec = 0;
 722         ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
 723         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 724         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 725
 726         if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
 727                 ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
 728                 ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
 729         }
 730
 731         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 732                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 733                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
 734         } else if (inode->i_blocks) {
 735                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
 736                        sizeof(ufs_inode->ui_u2.ui_addr));
 737         }
 738         else {
 739                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 740                        sizeof(ufs_inode->ui_u2.ui_symlink));
 741         }
 742
 743         if (!inode->i_nlink)
 744                 memset (ufs_inode, 0, sizeof(struct ufs_inode));
 745 }
 746
 747 static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
 748 {
 749         struct super_block *sb = inode->i_sb;
 750         struct ufs_inode_info *ufsi = UFS_I(inode);
 751
 752         UFSD("ENTER\n");
 753         ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
 754         ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);
 755
 756         ufs_inode->ui_uid = cpu_to_fs32(sb, i_uid_read(inode));
 757         ufs_inode->ui_gid = cpu_to_fs32(sb, i_gid_read(inode));
 758
 759         ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
 760         ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
 761         ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
 762         ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
 763         ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
 764         ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
 765         ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);
 766
 767         ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
 768         ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
 769         ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);
 770
 771         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
 772                 /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
 773                 ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
 774         } else if (inode->i_blocks) {
 775                 memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
 776                        sizeof(ufs_inode->ui_u2.ui_addr));
 777         } else {
 778                 memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
 779                        sizeof(ufs_inode->ui_u2.ui_symlink));
 780         }
 781
 782         if (!inode->i_nlink)
 783                 memset (ufs_inode, 0, sizeof(struct ufs2_inode));
 784         UFSD("EXIT\n");
 785 }
 786
 787 static int ufs_update_inode(struct inode * inode, int do_sync)
 788 {
 789         struct super_block *sb = inode->i_sb;
 790         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 791         struct buffer_head * bh;
 792
 793         UFSD("ENTER, ino %lu\n", inode->i_ino);
 794
 795         if (inode->i_ino < UFS_ROOTINO ||
 796             inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
 797                 ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
 798                 return -1;
 799         }
 800
 801         bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
 802         if (!bh) {
 803                 ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
 804                 return -1;
 805         }
 806         if (uspi->fs_magic == UFS2_MAGIC) {
 807                 struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
 808
 809                 ufs2_update_inode(inode,
 810                                   ufs2_inode + ufs_inotofsbo(inode->i_ino));
 811         } else {
 812                 struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;
 813
 814                 ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
 815         }
 816
 817         mark_buffer_dirty(bh);
 818         if (do_sync)
 819                 sync_dirty_buffer(bh);
 820         brelse (bh);
 821
 822         UFSD("EXIT\n");
 823         return 0;
 824 }
 825
 826 int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
 827 {
 828         return ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 829 }
 830
 831 int ufs_sync_inode (struct inode *inode)
 832 {
 833         return ufs_update_inode (inode, 1);
 834 }
 835
 836 void ufs_evict_inode(struct inode * inode)
 837 {
 838         int want_delete = 0;
 839
 840         if (!inode->i_nlink && !is_bad_inode(inode))
 841                 want_delete = 1;
 842
 843         truncate_inode_pages_final(&inode->i_data);
 844         if (want_delete) {
 845                 inode->i_size = 0;
 846                 if (inode->i_blocks)
 847                         ufs_truncate_blocks(inode);
 848         }
 849
 850         invalidate_inode_buffers(inode);
 851         clear_inode(inode);
 852
 853         if (want_delete)
 854                 ufs_free_inode(inode);
 855 }
 856
 857 struct to_free {
 858         struct inode *inode;
 859         u64 to;
 860         unsigned count;
 861 };
 862
 863 static inline void free_data(struct to_free *ctx, u64 from, unsigned count)
 864 {
 865         if (ctx->count && ctx->to != from) {
 866                 ufs_free_blocks(ctx->inode, ctx->to - ctx->count, ctx->count);
 867                 ctx->count = 0;
 868         }
 869         ctx->count += count;
 870         ctx->to = from + count;
 871 }
 872
 873 #define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift)
 874 #define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
 875
 876 static void ufs_trunc_direct(struct inode *inode)
 877 {
 878         struct ufs_inode_info *ufsi = UFS_I(inode);
 879         struct super_block * sb;
 880         struct ufs_sb_private_info * uspi;
 881         void *p;
 882         u64 frag1, frag2, frag3, frag4, block1, block2;
 883         struct to_free ctx = {.inode = inode};
 884         unsigned i, tmp;
 885
 886         UFSD("ENTER: ino %lu\n", inode->i_ino);
 887
 888         sb = inode->i_sb;
 889         uspi = UFS_SB(sb)->s_uspi;
 890
 891         frag1 = DIRECT_FRAGMENT;
 892         frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
 893         frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
 894         frag3 = frag4 & ~uspi->s_fpbmask;
 895         block1 = block2 = 0;
 896         if (frag2 > frag3) {
 897                 frag2 = frag4;
 898                 frag3 = frag4 = 0;
 899         } else if (frag2 < frag3) {
 900                 block1 = ufs_fragstoblks (frag2);
 901                 block2 = ufs_fragstoblks (frag3);
 902         }
 903
 904         UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
 905              " frag3 %llu, frag4 %llu\n", inode->i_ino,
 906              (unsigned long long)frag1, (unsigned long long)frag2,
 907              (unsigned long long)block1, (unsigned long long)block2,
 908              (unsigned long long)frag3, (unsigned long long)frag4);
 909
 910         if (frag1 >= frag2)
 911                 goto next1;
 912
 913         /*
 914          * Free first free fragments
 915          */
 916         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
 917         tmp = ufs_data_ptr_to_cpu(sb, p);
 918         if (!tmp )
 919                 ufs_panic (sb, "ufs_trunc_direct", "internal error");
 920         frag2 -= frag1;
 921         frag1 = ufs_fragnum (frag1);
 922
 923         ufs_free_fragments(inode, tmp + frag1, frag2);
 924
 925 next1:
 926         /*
 927          * Free whole blocks
 928          */
 929         for (i = block1 ; i < block2; i++) {
 930                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
 931                 tmp = ufs_data_ptr_to_cpu(sb, p);
 932                 if (!tmp)
 933                         continue;
 934                 write_seqlock(&ufsi->meta_lock);
 935                 ufs_data_ptr_clear(uspi, p);
 936                 write_sequnlock(&ufsi->meta_lock);
 937
 938                 free_data(&ctx, tmp, uspi->s_fpb);
 939         }
 940
 941         free_data(&ctx, 0, 0);
 942
 943         if (frag3 >= frag4)
 944                 goto next3;
 945
 946         /*
 947          * Free last free fragments
 948          */
 949         p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
 950         tmp = ufs_data_ptr_to_cpu(sb, p);
 951         if (!tmp )
 952                 ufs_panic(sb, "ufs_truncate_direct", "internal error");
 953         frag4 = ufs_fragnum (frag4);
 954         write_seqlock(&ufsi->meta_lock);
 955         ufs_data_ptr_clear(uspi, p);
 956         write_sequnlock(&ufsi->meta_lock);
 957
 958         ufs_free_fragments (inode, tmp, frag4);
 959  next3:
 960
 961         UFSD("EXIT: ino %lu\n", inode->i_ino);
 962 }
 963
 964 static void free_full_branch(struct inode *inode, u64 ind_block, int depth)
 965 {
 966         struct super_block *sb = inode->i_sb;
 967         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 968         struct ufs_buffer_head *ubh = ubh_bread(sb, ind_block, uspi->s_bsize);
 969         unsigned i;
 970
 971         if (!ubh)
 972                 return;
 973
 974         if (--depth) {
 975                 for (i = 0; i < uspi->s_apb; i++) {
 976                         void *p = ubh_get_data_ptr(uspi, ubh, i);
 977                         u64 block = ufs_data_ptr_to_cpu(sb, p);
 978                         if (block)
 979                                 free_full_branch(inode, block, depth);
 980                 }
 981         } else {
 982                 struct to_free ctx = {.inode = inode};
 983
 984                 for (i = 0; i < uspi->s_apb; i++) {
 985                         void *p = ubh_get_data_ptr(uspi, ubh, i);
 986                         u64 block = ufs_data_ptr_to_cpu(sb, p);
 987                         if (block)
 988                                 free_data(&ctx, block, uspi->s_fpb);
 989                 }
 990                 free_data(&ctx, 0, 0);
 991         }
 992
 993         ubh_bforget(ubh);
 994         ufs_free_blocks(inode, ind_block, uspi->s_fpb);
 995 }
 996
 997 static void free_branch_tail(struct inode *inode, unsigned from, struct ufs_buffer_head *ubh, int depth)
 998 {
 999         struct super_block *sb = inode->i_sb;
1000         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1001         unsigned i;
1002
1003         if (--depth) {
1004                 for (i = from; i < uspi->s_apb ; i++) {
1005                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1006                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1007                         if (block) {
1008                                 write_seqlock(&UFS_I(inode)->meta_lock);
1009                                 ufs_data_ptr_clear(uspi, p);
1010                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1011                                 ubh_mark_buffer_dirty(ubh);
1012                                 free_full_branch(inode, block, depth);
1013                         }
1014                 }
1015         } else {
1016                 struct to_free ctx = {.inode = inode};
1017
1018                 for (i = from; i < uspi->s_apb; i++) {
1019                         void *p = ubh_get_data_ptr(uspi, ubh, i);
1020                         u64 block = ufs_data_ptr_to_cpu(sb, p);
1021                         if (block) {
1022                                 write_seqlock(&UFS_I(inode)->meta_lock);
1023                                 ufs_data_ptr_clear(uspi, p);
1024                                 write_sequnlock(&UFS_I(inode)->meta_lock);
1025                                 ubh_mark_buffer_dirty(ubh);
1026                                 free_data(&ctx, block, uspi->s_fpb);
1027                         }
1028                 }
1029                 free_data(&ctx, 0, 0);
1030         }
1031         if (IS_SYNC(inode) && ubh_buffer_dirty(ubh))
1032                 ubh_sync_block(ubh);
1033         ubh_brelse(ubh);
1034 }
1035
1036 static int ufs_alloc_lastblock(struct inode *inode, loff_t size)
1037 {
1038         int err = 0;
1039         struct super_block *sb = inode->i_sb;
1040         struct address_space *mapping = inode->i_mapping;
1041         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1042         unsigned i, end;
1043         sector_t lastfrag;
1044         struct page *lastpage;
1045         struct buffer_head *bh;
1046         u64 phys64;
1047
1048         lastfrag = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
1049
1050         if (!lastfrag)
1051                 goto out;
1052
1053         lastfrag--;
1054
1055         lastpage = ufs_get_locked_page(mapping, lastfrag >>
1056                                        (PAGE_CACHE_SHIFT - inode->i_blkbits));
1057        if (IS_ERR(lastpage)) {
1058                err = -EIO;
1059                goto out;
1060        }
1061
1062        end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
1063        bh = page_buffers(lastpage);
1064        for (i = 0; i < end; ++i)
1065                bh = bh->b_this_page;
1066
1067
1068        err = ufs_getfrag_block(inode, lastfrag, bh, 1);
1069
1070        if (unlikely(err))
1071                goto out_unlock;
1072
1073        if (buffer_new(bh)) {
1074                clear_buffer_new(bh);
1075                unmap_underlying_metadata(bh->b_bdev,
1076                                          bh->b_blocknr);
1077                /*
1078                 * we do not zeroize fragment, because of
1079                 * if it maped to hole, it already contains zeroes
1080                 */
1081                set_buffer_uptodate(bh);
1082                mark_buffer_dirty(bh);
1083                set_page_dirty(lastpage);
1084        }
1085
1086        if (lastfrag >= UFS_IND_FRAGMENT) {
1087                end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
1088                phys64 = bh->b_blocknr + 1;
1089                for (i = 0; i < end; ++i) {
1090                        bh = sb_getblk(sb, i + phys64);
1091                        lock_buffer(bh);
1092                        memset(bh->b_data, 0, sb->s_blocksize);
1093                        set_buffer_uptodate(bh);
1094                        mark_buffer_dirty(bh);
1095                        unlock_buffer(bh);
1096                        sync_dirty_buffer(bh);
1097                        brelse(bh);
1098                }
1099        }
1100 out_unlock:
1101        ufs_put_locked_page(lastpage);
1102 out:
1103        return err;
1104 }
1105
1106 static void __ufs_truncate_blocks(struct inode *inode)
1107 {
1108         struct ufs_inode_info *ufsi = UFS_I(inode);
1109         struct super_block *sb = inode->i_sb;
1110         struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1111         unsigned offsets[4];
1112         int depth = ufs_block_to_path(inode, DIRECT_BLOCK, offsets);
1113         int depth2;
1114         unsigned i;
1115         struct ufs_buffer_head *ubh[3];
1116         void *p;
1117         u64 block;
1118
1119         if (!depth)
1120                 return;
1121
1122         /* find the last non-zero in offsets[] */
1123         for (depth2 = depth - 1; depth2; depth2--)
1124                 if (offsets[depth2])
1125                         break;
1126
1127         mutex_lock(&ufsi->truncate_mutex);
1128         if (depth == 1) {
1129                 ufs_trunc_direct(inode);
1130                 offsets[0] = UFS_IND_BLOCK;
1131         } else {
1132                 /* get the blocks that should be partially emptied */
1133                 p = ufs_get_direct_data_ptr(uspi, ufsi, offsets[0]);
1134                 for (i = 0; i < depth2; i++) {
1135                         offsets[i]++;   /* next branch is fully freed */
1136                         block = ufs_data_ptr_to_cpu(sb, p);
1137                         if (!block)
1138                                 break;
1139                         ubh[i] = ubh_bread(sb, block, uspi->s_bsize);
1140                         if (!ubh[i]) {
1141                                 write_seqlock(&ufsi->meta_lock);
1142                                 ufs_data_ptr_clear(uspi, p);
1143                                 write_sequnlock(&ufsi->meta_lock);
1144                                 break;
1145                         }
1146                         p = ubh_get_data_ptr(uspi, ubh[i], offsets[i + 1]);
1147                 }
1148                 while (i--)
1149                         free_branch_tail(inode, offsets[i + 1], ubh[i], depth - i - 1);
1150         }
1151         for (i = offsets[0]; i <= UFS_TIND_BLOCK; i++) {
1152                 p = ufs_get_direct_data_ptr(uspi, ufsi, i);
1153                 block = ufs_data_ptr_to_cpu(sb, p);
1154                 if (block) {
1155                         write_seqlock(&ufsi->meta_lock);
1156                         ufs_data_ptr_clear(uspi, p);
1157                         write_sequnlock(&ufsi->meta_lock);
1158                         free_full_branch(inode, block, i - UFS_IND_BLOCK + 1);
1159                 }
1160         }
1161         ufsi->i_lastfrag = DIRECT_FRAGMENT;
1162         mark_inode_dirty(inode);
1163         mutex_unlock(&ufsi->truncate_mutex);
1164 }
1165
1166 static int ufs_truncate(struct inode *inode, loff_t size)
1167 {
1168         int err = 0;
1169
1170         UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
1171              inode->i_ino, (unsigned long long)size,
1172              (unsigned long long)i_size_read(inode));
1173
1174         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1175               S_ISLNK(inode->i_mode)))
1176                 return -EINVAL;
1177         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1178                 return -EPERM;
1179
1180         err = ufs_alloc_lastblock(inode, size);
1181
1182         if (err)
1183                 goto out;
1184
1185         block_truncate_page(inode->i_mapping, size, ufs_getfrag_block);
1186
1187         truncate_setsize(inode, size);
1188
1189         __ufs_truncate_blocks(inode);
1190         inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
1191         mark_inode_dirty(inode);
1192 out:
1193         UFSD("EXIT: err %d\n", err);
1194         return err;
1195 }
1196
1197 void ufs_truncate_blocks(struct inode *inode)
1198 {
1199         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1200               S_ISLNK(inode->i_mode)))
1201                 return;
1202         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1203                 return;
1204         __ufs_truncate_blocks(inode);
1205 }
1206
1207 int ufs_setattr(struct dentry *dentry, struct iattr *attr)
1208 {
1209         struct inode *inode = d_inode(dentry);
1210         unsigned int ia_valid = attr->ia_valid;
1211         int error;
1212
1213         error = inode_change_ok(inode, attr);
1214         if (error)
1215                 return error;
1216
1217         if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
1218                 error = ufs_truncate(inode, attr->ia_size);
1219                 if (error)
1220                         return error;
1221         }
1222
1223         setattr_copy(inode, attr);
1224         mark_inode_dirty(inode);
1225         return 0;
1226 }
1227
1228 const struct inode_operations ufs_file_inode_operations = {
1229         .setattr = ufs_setattr,
1230 };