root/fs/ext2/inode.c

/* [previous][next][first][last][top][bottom][index][help] */

DEFINITIONS

This source file includes following definitions.
  1. ext2_put_inode
  2. block_bmap
  3. ext2_discard_prealloc
  4. ext2_alloc_block
  5. ext2_bmap
  6. inode_getblk
  7. block_getblk
  8. ext2_getblk
  9. ext2_bread
  10. ext2_read_inode
  11. ext2_update_inode
  12. ext2_write_inode
  13. ext2_sync_inode

   1 /*
   2  *  linux/fs/ext2/inode.c
   3  *
   4  *  Copyright (C) 1992, 1993, 1994  Remy Card (card@masi.ibp.fr)
   5  *                                  Laboratoire MASI - Institut Blaise Pascal
   6  *                                  Universite Pierre et Marie Curie (Paris VI)
   7  *
   8  *  from
   9  *
  10  *  linux/fs/minix/inode.c
  11  *
  12  *  Copyright (C) 1991, 1992  Linus Torvalds
  13  *
  14  *  Goal-directed block allocation by Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
  15  */
  16 
  17 #include <asm/segment.h>
  18 #include <asm/system.h>
  19 
  20 #include <linux/errno.h>
  21 #include <linux/fs.h>
  22 #include <linux/ext2_fs.h>
  23 #include <linux/sched.h>
  24 #include <linux/stat.h>
  25 #include <linux/string.h>
  26 #include <linux/locks.h>
  27 
  28 #define clear_block(addr,size) \
  29         __asm__("cld\n\t" \
  30                 "rep\n\t" \
  31                 "stosl" \
  32                 : \
  33                 :"a" (0), "c" (size / 4), "D" ((long) (addr)) \
  34                 :"cx", "di")
  35 
  36 void ext2_put_inode (struct inode * inode)
     /* [previous][next][first][last][top][bottom][index][help] */
  37 {
  38         ext2_discard_prealloc (inode);
  39         if (inode->i_nlink || inode->i_ino == EXT2_ACL_IDX_INO ||
  40             inode->i_ino == EXT2_ACL_DATA_INO)
  41                 return;
  42         inode->i_size = 0;
  43         if (inode->i_blocks)
  44                 ext2_truncate (inode);
  45         ext2_free_inode (inode);
  46 }
  47 
  48 #define inode_bmap(inode, nr) ((inode)->u.ext2_i.i_data[(nr)])
  49 
  50 static int block_bmap (struct buffer_head * bh, int nr)
     /* [previous][next][first][last][top][bottom][index][help] */
  51 {
  52         int tmp;
  53 
  54         if (!bh)
  55                 return 0;
  56         tmp = ((unsigned long *) bh->b_data)[nr];
  57         brelse (bh);
  58         return tmp;
  59 }
  60 
  61 /* 
  62  * ext2_discard_prealloc and ext2_alloc_block are atomic wrt. the
  63  * superblock in the same manner as are ext2_free_blocks and
  64  * ext2_new_block.  We just wait on the super rather than locking it
  65  * here, since ext2_new_block will do the necessary locking and we
  66  * can't block until then.
  67  */
  68 void ext2_discard_prealloc (struct inode * inode)
     /* [previous][next][first][last][top][bottom][index][help] */
  69 {
  70 #ifdef EXT2_PREALLOCATE
  71         if (inode->u.ext2_i.i_prealloc_count) {
  72                 int i = inode->u.ext2_i.i_prealloc_count;
  73                 inode->u.ext2_i.i_prealloc_count = 0;
  74                 ext2_free_blocks (inode->i_sb,
  75                                   inode->u.ext2_i.i_prealloc_block,
  76                                   i);
  77         }
  78 #endif
  79 }
  80 
  81 static int ext2_alloc_block (struct inode * inode, unsigned long goal)
     /* [previous][next][first][last][top][bottom][index][help] */
  82 {
  83 #ifdef EXT2FS_DEBUG
  84         static unsigned long alloc_hits = 0, alloc_attempts = 0;
  85 #endif
  86         unsigned long result;
  87         struct buffer_head * bh;
  88 
  89         wait_on_super (inode->i_sb);
  90 
  91 #ifdef EXT2_PREALLOCATE
  92         if (inode->u.ext2_i.i_prealloc_count &&
  93             (goal == inode->u.ext2_i.i_prealloc_block ||
  94              goal + 1 == inode->u.ext2_i.i_prealloc_block))
  95         {               
  96                 result = inode->u.ext2_i.i_prealloc_block++;
  97                 inode->u.ext2_i.i_prealloc_count--;
  98                 ext2_debug ("preallocation hit (%lu/%lu).\n",
  99                             ++alloc_hits, ++alloc_attempts);
 100 
 101                 /* It doesn't matter if we block in getblk() since
 102                    we have already atomically allocated the block, and
 103                    are only clearing it now. */
 104                 if (!(bh = getblk (inode->i_sb->s_dev, result,
 105                                    inode->i_sb->s_blocksize))) {
 106                         ext2_error (inode->i_sb, "ext2_alloc_block",
 107                                     "cannot get block %lu", result);
 108                         return 0;
 109                 }
 110                 clear_block (bh->b_data, inode->i_sb->s_blocksize);
 111                 bh->b_uptodate = 1;
 112                 bh->b_dirt = 1;
 113                 brelse (bh);
 114         } else {
 115                 ext2_discard_prealloc (inode);
 116                 ext2_debug ("preallocation miss (%lu/%lu).\n",
 117                             alloc_hits, ++alloc_attempts);
 118                 if (S_ISREG(inode->i_mode))
 119                         result = ext2_new_block
 120                                 (inode->i_sb, goal,
 121                                  &inode->u.ext2_i.i_prealloc_count,
 122                                  &inode->u.ext2_i.i_prealloc_block);
 123                 else
 124                         result = ext2_new_block (inode->i_sb, goal, 0, 0);
 125         }
 126 #else
 127         result = ext2_new_block (inode->i_sb, goal, 0, 0);
 128 #endif
 129 
 130         return result;
 131 }
 132 
 133 
 134 int ext2_bmap (struct inode * inode, int block)
     /* [previous][next][first][last][top][bottom][index][help] */
 135 {
 136         int i;
 137         int addr_per_block = EXT2_ADDR_PER_BLOCK(inode->i_sb);
 138 
 139         if (block < 0) {
 140                 ext2_warning (inode->i_sb, "ext2_bmap", "block < 0");
 141                 return 0;
 142         }
 143         if (block >= EXT2_NDIR_BLOCKS + addr_per_block +
 144                      addr_per_block * addr_per_block +
 145                      addr_per_block * addr_per_block * addr_per_block) {
 146                 ext2_warning (inode->i_sb, "ext2_bmap", "block > big");
 147                 return 0;
 148         }
 149         if (block < EXT2_NDIR_BLOCKS)
 150                 return inode_bmap (inode, block);
 151         block -= EXT2_NDIR_BLOCKS;
 152         if (block < addr_per_block) {
 153                 i = inode_bmap (inode, EXT2_IND_BLOCK);
 154                 if (!i)
 155                         return 0;
 156                 return block_bmap (bread (inode->i_dev, i,
 157                                           inode->i_sb->s_blocksize), block);
 158         }
 159         block -= addr_per_block;
 160         if (block < addr_per_block * addr_per_block) {
 161                 i = inode_bmap (inode, EXT2_DIND_BLOCK);
 162                 if (!i)
 163                         return 0;
 164                 i = block_bmap (bread (inode->i_dev, i,
 165                                        inode->i_sb->s_blocksize),
 166                                 block / addr_per_block);
 167                 if (!i)
 168                         return 0;
 169                 return block_bmap (bread (inode->i_dev, i,
 170                                           inode->i_sb->s_blocksize),
 171                                    block & (addr_per_block - 1));
 172         }
 173         block -= addr_per_block * addr_per_block;
 174         i = inode_bmap (inode, EXT2_TIND_BLOCK);
 175         if (!i)
 176                 return 0;
 177         i = block_bmap (bread (inode->i_dev, i, inode->i_sb->s_blocksize),
 178                         block / (addr_per_block * addr_per_block));
 179         if (!i)
 180                 return 0;
 181         i = block_bmap (bread (inode->i_dev, i, inode->i_sb->s_blocksize),
 182                         (block / addr_per_block) & (addr_per_block - 1));
 183         if (!i)
 184                 return 0;
 185         return block_bmap (bread (inode->i_dev, i, inode->i_sb->s_blocksize),
 186                            block & (addr_per_block - 1));
 187 }
 188 
 189 static struct buffer_head * inode_getblk (struct inode * inode, int nr,
     /* [previous][next][first][last][top][bottom][index][help] */
 190                                           int create, int new_block, int * err)
 191 {
 192         int tmp, goal = 0;
 193         unsigned long * p;
 194         struct buffer_head * result;
 195         int blocks = inode->i_sb->s_blocksize / 512;
 196 
 197         p = inode->u.ext2_i.i_data + nr;
 198 repeat:
 199         tmp = *p;
 200         if (tmp) {
 201                 result = getblk (inode->i_dev, tmp, inode->i_sb->s_blocksize);
 202                 if (tmp == *p)
 203                         return result;
 204                 brelse (result);
 205                 goto repeat;
 206         }
 207         if (!create || new_block >= 
 208             (current->rlim[RLIMIT_FSIZE].rlim_cur >>
 209              EXT2_BLOCK_SIZE_BITS(inode->i_sb))) {
 210                 *err = -EFBIG;
 211                 return NULL;
 212         }
 213         if (inode->u.ext2_i.i_next_alloc_block == new_block)
 214                 goal = inode->u.ext2_i.i_next_alloc_goal;
 215 
 216         ext2_debug ("hint = %d,", goal);
 217 
 218         if (!goal) {
 219                 for (tmp = nr - 1; tmp >= 0; tmp--) {
 220                         if (inode->u.ext2_i.i_data[tmp]) {
 221                                 goal = inode->u.ext2_i.i_data[tmp];
 222                                 break;
 223                         }
 224                 }
 225                 if (!goal)
 226                         goal = (inode->u.ext2_i.i_block_group * 
 227                                 EXT2_BLOCKS_PER_GROUP(inode->i_sb)) +
 228                                inode->i_sb->u.ext2_sb.s_es->s_first_data_block;
 229         }
 230 
 231         ext2_debug ("goal = %d.\n", goal);
 232 
 233         tmp = ext2_alloc_block (inode, goal);
 234         if (!tmp)
 235                 return NULL;
 236         result = getblk (inode->i_dev, tmp, inode->i_sb->s_blocksize);
 237         if (*p) {
 238                 ext2_free_blocks (inode->i_sb, tmp, 1);
 239                 brelse (result);
 240                 goto repeat;
 241         }
 242         *p = tmp;
 243         inode->u.ext2_i.i_next_alloc_block = new_block;
 244         inode->u.ext2_i.i_next_alloc_goal = tmp;
 245         inode->i_ctime = CURRENT_TIME;
 246         inode->i_blocks += blocks;
 247         if (IS_SYNC(inode))
 248                 ext2_sync_inode (inode);
 249         else
 250                 inode->i_dirt = 1;
 251         return result;
 252 }
 253 
 254 static struct buffer_head * block_getblk (struct inode * inode,
     /* [previous][next][first][last][top][bottom][index][help] */
 255                                           struct buffer_head * bh, int nr,
 256                                           int create, int blocksize, 
 257                                           int new_block, int * err)
 258 {
 259         int tmp, goal = 0;
 260         unsigned long * p;
 261         struct buffer_head * result;
 262         int blocks = inode->i_sb->s_blocksize / 512;
 263 
 264         if (!bh)
 265                 return NULL;
 266         if (!bh->b_uptodate) {
 267                 ll_rw_block (READ, 1, &bh);
 268                 wait_on_buffer (bh);
 269                 if (!bh->b_uptodate) {
 270                         brelse (bh);
 271                         return NULL;
 272                 }
 273         }
 274         p = (unsigned long *) bh->b_data + nr;
 275 repeat:
 276         tmp = *p;
 277         if (tmp) {
 278                 result = getblk (bh->b_dev, tmp, blocksize);
 279                 if (tmp == *p) {
 280                         brelse (bh);
 281                         return result;
 282                 }
 283                 brelse (result);
 284                 goto repeat;
 285         }
 286         if (!create || new_block >= 
 287             (current->rlim[RLIMIT_FSIZE].rlim_cur >> 
 288              EXT2_BLOCK_SIZE_BITS(inode->i_sb))) {
 289                 brelse (bh);
 290                 *err = -EFBIG;
 291                 return NULL;
 292         }
 293         if (inode->u.ext2_i.i_next_alloc_block == new_block)
 294                 goal = inode->u.ext2_i.i_next_alloc_goal;
 295         if (!goal) {
 296                 for (tmp = nr - 1; tmp >= 0; tmp--) {
 297                         if (((unsigned long *) bh->b_data)[tmp]) {
 298                                 goal = ((unsigned long *)bh->b_data)[tmp];
 299                                 break;
 300                         }
 301                 }
 302                 if (!goal)
 303                         goal = bh->b_blocknr;
 304         }
 305         tmp = ext2_alloc_block (inode, goal);
 306         if (!tmp) {
 307                 brelse (bh);
 308                 return NULL;
 309         }
 310         result = getblk (bh->b_dev, tmp, blocksize);
 311         if (*p) {
 312                 ext2_free_blocks (inode->i_sb, tmp, 1);
 313                 brelse (result);
 314                 goto repeat;
 315         }
 316         *p = tmp;
 317         bh->b_dirt = 1;
 318         if (IS_SYNC(inode)) {
 319                 ll_rw_block (WRITE, 1, &bh);
 320                 wait_on_buffer (bh);
 321         }
 322         inode->i_ctime = CURRENT_TIME;
 323         inode->i_blocks += blocks;
 324         inode->i_dirt = 1;
 325         inode->u.ext2_i.i_next_alloc_block = new_block;
 326         inode->u.ext2_i.i_next_alloc_goal = tmp;
 327         brelse (bh);
 328         return result;
 329 }
 330 
 331 struct buffer_head * ext2_getblk (struct inode * inode, long block,
     /* [previous][next][first][last][top][bottom][index][help] */
 332                                   int create, int * err)
 333 {
 334         struct buffer_head * bh;
 335         unsigned long b;
 336         unsigned long addr_per_block = EXT2_ADDR_PER_BLOCK(inode->i_sb);
 337 
 338         *err = -EIO;
 339         if (block < 0) {
 340                 ext2_warning (inode->i_sb, "ext2_getblk", "block < 0");
 341                 return NULL;
 342         }
 343         if (block > EXT2_NDIR_BLOCKS + addr_per_block  +
 344                     addr_per_block * addr_per_block +
 345                     addr_per_block * addr_per_block * addr_per_block) {
 346                 ext2_warning (inode->i_sb, "ext2_getblk", "block > big");
 347                 return NULL;
 348         }
 349         /*
 350          * If this is a sequential block allocation, set the next_alloc_block
 351          * to this block now so that all the indblock and data block
 352          * allocations use the same goal zone
 353          */
 354 
 355         ext2_debug ("block %lu, next %lu, goal %lu.\n", block, 
 356                     inode->u.ext2_i.i_next_alloc_block,
 357                     inode->u.ext2_i.i_next_alloc_goal);
 358 
 359         if (block == inode->u.ext2_i.i_next_alloc_block + 1) {
 360                 inode->u.ext2_i.i_next_alloc_block++;
 361                 inode->u.ext2_i.i_next_alloc_goal++;
 362         }
 363 
 364         *err = -ENOSPC;
 365         b = block;
 366         if (block < EXT2_NDIR_BLOCKS)
 367                 return inode_getblk (inode, block, create, b, err);
 368         block -= EXT2_NDIR_BLOCKS;
 369         if (block < addr_per_block) {
 370                 bh = inode_getblk (inode, EXT2_IND_BLOCK, create, b, err);
 371                 return block_getblk (inode, bh, block, create,
 372                                      inode->i_sb->s_blocksize, b, err);
 373         }
 374         block -= addr_per_block;
 375         if (block < addr_per_block * addr_per_block) {
 376                 bh = inode_getblk (inode, EXT2_DIND_BLOCK, create, b, err);
 377                 bh = block_getblk (inode, bh, block / addr_per_block, create,
 378                                    inode->i_sb->s_blocksize, b, err);
 379                 return block_getblk (inode, bh, block & (addr_per_block - 1),
 380                                      create, inode->i_sb->s_blocksize, b, err);
 381         }
 382         block -= addr_per_block * addr_per_block;
 383         bh = inode_getblk (inode, EXT2_TIND_BLOCK, create, b, err);
 384         bh = block_getblk (inode, bh, block/(addr_per_block * addr_per_block),
 385                            create, inode->i_sb->s_blocksize, b, err);
 386         bh = block_getblk (inode, bh, (block/addr_per_block) & (addr_per_block - 1),
 387                            create, inode->i_sb->s_blocksize, b, err);
 388         return block_getblk (inode, bh, block & (addr_per_block - 1), create,
 389                              inode->i_sb->s_blocksize, b, err);
 390 }
 391 
 392 struct buffer_head * ext2_bread (struct inode * inode, int block, 
     /* [previous][next][first][last][top][bottom][index][help] */
 393                                  int create, int *err)
 394 {
 395         struct buffer_head * bh;
 396 
 397         bh = ext2_getblk (inode, block, create, err);
 398         if (!bh || bh->b_uptodate)
 399                 return bh;
 400         ll_rw_block (READ, 1, &bh);
 401         wait_on_buffer (bh);
 402         if (bh->b_uptodate)
 403                 return bh;
 404         brelse (bh);
 405         *err = -EIO;
 406         return NULL;
 407 }
 408 
 409 void ext2_read_inode (struct inode * inode)
     /* [previous][next][first][last][top][bottom][index][help] */
 410 {
 411         struct buffer_head * bh;
 412         struct ext2_inode * raw_inode;
 413         unsigned long block_group;
 414         unsigned long group_desc;
 415         unsigned long desc;
 416         unsigned long block;
 417         struct ext2_group_desc * gdp;
 418 
 419         if ((inode->i_ino != EXT2_ROOT_INO && inode->i_ino != EXT2_ACL_IDX_INO &&
 420              inode->i_ino != EXT2_ACL_DATA_INO && inode->i_ino < EXT2_FIRST_INO) ||
 421             inode->i_ino > inode->i_sb->u.ext2_sb.s_es->s_inodes_count) {
 422                 ext2_error (inode->i_sb, "ext2_read_inode",
 423                             "bad inode number: %lu", inode->i_ino);
 424                 return;
 425         }
 426         block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(inode->i_sb);
 427         if (block_group >= inode->i_sb->u.ext2_sb.s_groups_count)
 428                 ext2_panic (inode->i_sb, "ext2_read_inode",
 429                             "group >= groups count");
 430         group_desc = block_group / EXT2_DESC_PER_BLOCK(inode->i_sb);
 431         desc = block_group % EXT2_DESC_PER_BLOCK(inode->i_sb);
 432         bh = inode->i_sb->u.ext2_sb.s_group_desc[group_desc];
 433         if (!bh)
 434                 ext2_panic (inode->i_sb, "ext2_read_inode",
 435                             "Descriptor not loaded");
 436         gdp = (struct ext2_group_desc *) bh->b_data;
 437         block = gdp[desc].bg_inode_table +
 438                 (((inode->i_ino - 1) % EXT2_INODES_PER_GROUP(inode->i_sb))
 439                  / EXT2_INODES_PER_BLOCK(inode->i_sb));
 440         if (!(bh = bread (inode->i_dev, block, inode->i_sb->s_blocksize)))
 441                 ext2_panic (inode->i_sb, "ext2_read_inode",
 442                             "unable to read i-node block\n"
 443                             "inode=%lu, block=%lu", inode->i_ino, block);
 444         raw_inode = ((struct ext2_inode *) bh->b_data) +
 445                 (inode->i_ino - 1) % EXT2_INODES_PER_BLOCK(inode->i_sb);
 446         inode->i_mode = raw_inode->i_mode;
 447         inode->i_uid = raw_inode->i_uid;
 448         inode->i_gid = raw_inode->i_gid;
 449         inode->i_nlink = raw_inode->i_links_count;
 450         inode->i_size = raw_inode->i_size;
 451         inode->i_atime = raw_inode->i_atime;
 452         inode->i_ctime = raw_inode->i_ctime;
 453         inode->i_mtime = raw_inode->i_mtime;
 454         inode->u.ext2_i.i_dtime = raw_inode->i_dtime;
 455         inode->i_blksize = inode->i_sb->s_blocksize;
 456         inode->i_blocks = raw_inode->i_blocks;
 457         inode->u.ext2_i.i_flags = raw_inode->i_flags;
 458         inode->u.ext2_i.i_faddr = raw_inode->i_faddr;
 459         inode->u.ext2_i.i_frag = raw_inode->i_frag;
 460         inode->u.ext2_i.i_fsize = raw_inode->i_fsize;
 461         inode->u.ext2_i.i_file_acl = raw_inode->i_file_acl;
 462         inode->u.ext2_i.i_dir_acl = raw_inode->i_dir_acl;
 463         inode->u.ext2_i.i_version = raw_inode->i_version;
 464         inode->u.ext2_i.i_block_group = block_group;
 465         inode->u.ext2_i.i_next_alloc_block = 0;
 466         inode->u.ext2_i.i_next_alloc_goal = 0;
 467         if (inode->u.ext2_i.i_prealloc_count)
 468                 ext2_error (inode->i_sb, "ext2_read_inode",
 469                             "New inode has non-zero prealloc count!");
 470         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 471                 inode->i_rdev = raw_inode->i_block[0];
 472         else for (block = 0; block < EXT2_N_BLOCKS; block++)
 473                 inode->u.ext2_i.i_data[block] = raw_inode->i_block[block];
 474         brelse (bh);
 475         inode->i_op = NULL;
 476         if (inode->i_ino == EXT2_ACL_IDX_INO ||
 477             inode->i_ino == EXT2_ACL_DATA_INO)
 478                 /* Nothing to do */ ;
 479         else if (S_ISREG(inode->i_mode))
 480                 inode->i_op = &ext2_file_inode_operations;
 481         else if (S_ISDIR(inode->i_mode))
 482                 inode->i_op = &ext2_dir_inode_operations;
 483         else if (S_ISLNK(inode->i_mode))
 484                 inode->i_op = &ext2_symlink_inode_operations;
 485         else if (S_ISCHR(inode->i_mode))
 486                 inode->i_op = &chrdev_inode_operations;
 487         else if (S_ISBLK(inode->i_mode))
 488                 inode->i_op = &blkdev_inode_operations;
 489         else if (S_ISFIFO(inode->i_mode))
 490                 init_fifo(inode);
 491         if (inode->u.ext2_i.i_flags & EXT2_SYNC_FL)
 492                 inode->i_flags |= MS_SYNC;
 493 }
 494 
 495 static struct buffer_head * ext2_update_inode (struct inode * inode)
     /* [previous][next][first][last][top][bottom][index][help] */
 496 {
 497         struct buffer_head * bh;
 498         struct ext2_inode * raw_inode;
 499         unsigned long block_group;
 500         unsigned long group_desc;
 501         unsigned long desc;
 502         unsigned long block;
 503         struct ext2_group_desc * gdp;
 504 
 505         if ((inode->i_ino != EXT2_ROOT_INO && inode->i_ino < EXT2_FIRST_INO) ||
 506             inode->i_ino > inode->i_sb->u.ext2_sb.s_es->s_inodes_count) {
 507                 ext2_error (inode->i_sb, "ext2_write_inode",
 508                             "bad inode number: %lu", inode->i_ino);
 509                 return 0;
 510         }
 511         block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(inode->i_sb);
 512         if (block_group >= inode->i_sb->u.ext2_sb.s_groups_count)
 513                 ext2_panic (inode->i_sb, "ext2_write_inode",
 514                             "group >= groups count");
 515         group_desc = block_group / EXT2_DESC_PER_BLOCK(inode->i_sb);
 516         desc = block_group % EXT2_DESC_PER_BLOCK(inode->i_sb);
 517         bh = inode->i_sb->u.ext2_sb.s_group_desc[group_desc];
 518         if (!bh)
 519                 ext2_panic (inode->i_sb, "ext2_write_inode",
 520                             "Descriptor not loaded");
 521         gdp = (struct ext2_group_desc *) bh->b_data;
 522         block = gdp[desc].bg_inode_table +
 523                 (((inode->i_ino - 1) % EXT2_INODES_PER_GROUP(inode->i_sb))
 524                  / EXT2_INODES_PER_BLOCK(inode->i_sb));
 525         if (!(bh = bread (inode->i_dev, block, inode->i_sb->s_blocksize)))
 526                 ext2_panic (inode->i_sb, "ext2_write_inode",
 527                             "unable to read i-node block\n"
 528                             "inode=%lu, block=%lu", inode->i_ino, block);
 529         raw_inode = ((struct ext2_inode *)bh->b_data) +
 530                 (inode->i_ino - 1) % EXT2_INODES_PER_BLOCK(inode->i_sb);
 531         raw_inode->i_mode = inode->i_mode;
 532         raw_inode->i_uid = inode->i_uid;
 533         raw_inode->i_gid = inode->i_gid;
 534         raw_inode->i_links_count = inode->i_nlink;
 535         raw_inode->i_size = inode->i_size;
 536         raw_inode->i_atime = inode->i_atime;
 537         raw_inode->i_ctime = inode->i_ctime;
 538         raw_inode->i_mtime = inode->i_mtime;
 539         raw_inode->i_blocks = inode->i_blocks;
 540         raw_inode->i_dtime = inode->u.ext2_i.i_dtime;
 541         raw_inode->i_flags = inode->u.ext2_i.i_flags;
 542         raw_inode->i_faddr = inode->u.ext2_i.i_faddr;
 543         raw_inode->i_frag = inode->u.ext2_i.i_frag;
 544         raw_inode->i_fsize = inode->u.ext2_i.i_fsize;
 545         raw_inode->i_file_acl = inode->u.ext2_i.i_file_acl;
 546         raw_inode->i_dir_acl = inode->u.ext2_i.i_dir_acl;
 547         raw_inode->i_version = inode->u.ext2_i.i_version;
 548         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 549                 raw_inode->i_block[0] = inode->i_rdev;
 550         else for (block = 0; block < EXT2_N_BLOCKS; block++)
 551                 raw_inode->i_block[block] = inode->u.ext2_i.i_data[block];
 552         bh->b_dirt = 1;
 553         inode->i_dirt = 0;
 554         return bh;
 555 }
 556 
 557 void ext2_write_inode (struct inode * inode)
     /* [previous][next][first][last][top][bottom][index][help] */
 558 {
 559         struct buffer_head * bh;
 560         bh = ext2_update_inode (inode);
 561         brelse (bh);
 562 }
 563 
 564 int ext2_sync_inode (struct inode *inode)
     /* [previous][next][first][last][top][bottom][index][help] */
 565 {
 566         int err = 0;
 567         struct buffer_head *bh;
 568 
 569         bh = ext2_update_inode (inode);
 570         if (bh && bh->b_dirt)
 571         {
 572                 ll_rw_block (WRITE, 1, &bh);
 573                 wait_on_buffer (bh);
 574                 if (bh->b_req && !bh->b_uptodate)
 575                 {
 576                         printk ("IO error syncing ext2 inode [%04x:%08lx]\n",
 577                                 inode->i_dev, inode->i_ino);
 578                         err = -1;
 579                 }
 580         }
 581         else if (!bh)
 582                 err = -1;
 583         brelse (bh);
 584         return err;
 585 }

/* [previous][next][first][last][top][bottom][index][help] */