1 /* 2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 #include "xfs.h" 19 #include "xfs_fs.h" 20 #include "xfs_format.h" 21 #include "xfs_log_format.h" 22 #include "xfs_trans_resv.h" 23 #include "xfs_mount.h" 24 #include "xfs_defer.h" 25 #include "xfs_da_format.h" 26 #include "xfs_da_btree.h" 27 #include "xfs_inode.h" 28 #include "xfs_trans.h" 29 #include "xfs_inode_item.h" 30 #include "xfs_bmap.h" 31 #include "xfs_dir2.h" 32 #include "xfs_dir2_priv.h" 33 #include "xfs_error.h" 34 #include "xfs_trace.h" 35 36 struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR }; 37 38 /* 39 * Convert inode mode to directory entry filetype 40 */ 41 unsigned char xfs_mode_to_ftype(int mode) 42 { 43 switch (mode & S_IFMT) { 44 case S_IFREG: 45 return XFS_DIR3_FT_REG_FILE; 46 case S_IFDIR: 47 return XFS_DIR3_FT_DIR; 48 case S_IFCHR: 49 return XFS_DIR3_FT_CHRDEV; 50 case S_IFBLK: 51 return XFS_DIR3_FT_BLKDEV; 52 case S_IFIFO: 53 return XFS_DIR3_FT_FIFO; 54 case S_IFSOCK: 55 return XFS_DIR3_FT_SOCK; 56 case S_IFLNK: 57 return XFS_DIR3_FT_SYMLINK; 58 default: 59 return XFS_DIR3_FT_UNKNOWN; 60 } 61 } 62 63 /* 64 * ASCII case-insensitive (ie. A-Z) support for directories that was 65 * used in IRIX. 66 */ 67 STATIC xfs_dahash_t 68 xfs_ascii_ci_hashname( 69 struct xfs_name *name) 70 { 71 xfs_dahash_t hash; 72 int i; 73 74 for (i = 0, hash = 0; i < name->len; i++) 75 hash = tolower(name->name[i]) ^ rol32(hash, 7); 76 77 return hash; 78 } 79 80 STATIC enum xfs_dacmp 81 xfs_ascii_ci_compname( 82 struct xfs_da_args *args, 83 const unsigned char *name, 84 int len) 85 { 86 enum xfs_dacmp result; 87 int i; 88 89 if (args->namelen != len) 90 return XFS_CMP_DIFFERENT; 91 92 result = XFS_CMP_EXACT; 93 for (i = 0; i < len; i++) { 94 if (args->name[i] == name[i]) 95 continue; 96 if (tolower(args->name[i]) != tolower(name[i])) 97 return XFS_CMP_DIFFERENT; 98 result = XFS_CMP_CASE; 99 } 100 101 return result; 102 } 103 104 static const struct xfs_nameops xfs_ascii_ci_nameops = { 105 .hashname = xfs_ascii_ci_hashname, 106 .compname = xfs_ascii_ci_compname, 107 }; 108 109 int 110 xfs_da_mount( 111 struct xfs_mount *mp) 112 { 113 struct xfs_da_geometry *dageo; 114 int nodehdr_size; 115 116 117 ASSERT(mp->m_sb.sb_versionnum & XFS_SB_VERSION_DIRV2BIT); 118 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <= 119 XFS_MAX_BLOCKSIZE); 120 121 mp->m_dir_inode_ops = xfs_dir_get_ops(mp, NULL); 122 mp->m_nondir_inode_ops = xfs_nondir_get_ops(mp, NULL); 123 124 nodehdr_size = mp->m_dir_inode_ops->node_hdr_size; 125 mp->m_dir_geo = kmem_zalloc(sizeof(struct xfs_da_geometry), 126 KM_SLEEP | KM_MAYFAIL); 127 mp->m_attr_geo = kmem_zalloc(sizeof(struct xfs_da_geometry), 128 KM_SLEEP | KM_MAYFAIL); 129 if (!mp->m_dir_geo || !mp->m_attr_geo) { 130 kmem_free(mp->m_dir_geo); 131 kmem_free(mp->m_attr_geo); 132 return -ENOMEM; 133 } 134 135 /* set up directory geometry */ 136 dageo = mp->m_dir_geo; 137 dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog; 138 dageo->fsblog = mp->m_sb.sb_blocklog; 139 dageo->blksize = 1 << dageo->blklog; 140 dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog; 141 142 /* 143 * Now we've set up the block conversion variables, we can calculate the 144 * segment block constants using the geometry structure. 145 */ 146 dageo->datablk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_DATA_OFFSET); 147 dageo->leafblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_LEAF_OFFSET); 148 dageo->freeblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_FREE_OFFSET); 149 dageo->node_ents = (dageo->blksize - nodehdr_size) / 150 (uint)sizeof(xfs_da_node_entry_t); 151 dageo->magicpct = (dageo->blksize * 37) / 100; 152 153 /* set up attribute geometry - single fsb only */ 154 dageo = mp->m_attr_geo; 155 dageo->blklog = mp->m_sb.sb_blocklog; 156 dageo->fsblog = mp->m_sb.sb_blocklog; 157 dageo->blksize = 1 << dageo->blklog; 158 dageo->fsbcount = 1; 159 dageo->node_ents = (dageo->blksize - nodehdr_size) / 160 (uint)sizeof(xfs_da_node_entry_t); 161 dageo->magicpct = (dageo->blksize * 37) / 100; 162 163 if (xfs_sb_version_hasasciici(&mp->m_sb)) 164 mp->m_dirnameops = &xfs_ascii_ci_nameops; 165 else 166 mp->m_dirnameops = &xfs_default_nameops; 167 168 return 0; 169 } 170 171 void 172 xfs_da_unmount( 173 struct xfs_mount *mp) 174 { 175 kmem_free(mp->m_dir_geo); 176 kmem_free(mp->m_attr_geo); 177 } 178 179 /* 180 * Return 1 if directory contains only "." and "..". 181 */ 182 int 183 xfs_dir_isempty( 184 xfs_inode_t *dp) 185 { 186 xfs_dir2_sf_hdr_t *sfp; 187 188 ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 189 if (dp->i_d.di_size == 0) /* might happen during shutdown. */ 190 return 1; 191 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp)) 192 return 0; 193 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data; 194 return !sfp->count; 195 } 196 197 /* 198 * Validate a given inode number. 199 */ 200 int 201 xfs_dir_ino_validate( 202 xfs_mount_t *mp, 203 xfs_ino_t ino) 204 { 205 xfs_agblock_t agblkno; 206 xfs_agino_t agino; 207 xfs_agnumber_t agno; 208 int ino_ok; 209 int ioff; 210 211 agno = XFS_INO_TO_AGNO(mp, ino); 212 agblkno = XFS_INO_TO_AGBNO(mp, ino); 213 ioff = XFS_INO_TO_OFFSET(mp, ino); 214 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff); 215 ino_ok = 216 agno < mp->m_sb.sb_agcount && 217 agblkno < mp->m_sb.sb_agblocks && 218 agblkno != 0 && 219 ioff < (1 << mp->m_sb.sb_inopblog) && 220 XFS_AGINO_TO_INO(mp, agno, agino) == ino; 221 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE, 222 XFS_RANDOM_DIR_INO_VALIDATE))) { 223 xfs_warn(mp, "Invalid inode number 0x%Lx", 224 (unsigned long long) ino); 225 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp); 226 return -EFSCORRUPTED; 227 } 228 return 0; 229 } 230 231 /* 232 * Initialize a directory with its "." and ".." entries. 233 */ 234 int 235 xfs_dir_init( 236 xfs_trans_t *tp, 237 xfs_inode_t *dp, 238 xfs_inode_t *pdp) 239 { 240 struct xfs_da_args *args; 241 int error; 242 243 ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 244 error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino); 245 if (error) 246 return error; 247 248 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS); 249 if (!args) 250 return -ENOMEM; 251 252 args->geo = dp->i_mount->m_dir_geo; 253 args->dp = dp; 254 args->trans = tp; 255 error = xfs_dir2_sf_create(args, pdp->i_ino); 256 kmem_free(args); 257 return error; 258 } 259 260 /* 261 * Enter a name in a directory, or check for available space. 262 * If inum is 0, only the available space test is performed. 263 */ 264 int 265 xfs_dir_createname( 266 xfs_trans_t *tp, 267 xfs_inode_t *dp, 268 struct xfs_name *name, 269 xfs_ino_t inum, /* new entry inode number */ 270 xfs_fsblock_t *first, /* bmap's firstblock */ 271 struct xfs_defer_ops *dfops, /* bmap's freeblock list */ 272 xfs_extlen_t total) /* bmap's total block count */ 273 { 274 struct xfs_da_args *args; 275 int rval; 276 int v; /* type-checking value */ 277 278 ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 279 if (inum) { 280 rval = xfs_dir_ino_validate(tp->t_mountp, inum); 281 if (rval) 282 return rval; 283 XFS_STATS_INC(dp->i_mount, xs_dir_create); 284 } 285 286 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS); 287 if (!args) 288 return -ENOMEM; 289 290 args->geo = dp->i_mount->m_dir_geo; 291 args->name = name->name; 292 args->namelen = name->len; 293 args->filetype = name->type; 294 args->hashval = dp->i_mount->m_dirnameops->hashname(name); 295 args->inumber = inum; 296 args->dp = dp; 297 args->firstblock = first; 298 args->dfops = dfops; 299 args->total = total; 300 args->whichfork = XFS_DATA_FORK; 301 args->trans = tp; 302 args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT; 303 if (!inum) 304 args->op_flags |= XFS_DA_OP_JUSTCHECK; 305 306 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) { 307 rval = xfs_dir2_sf_addname(args); 308 goto out_free; 309 } 310 311 rval = xfs_dir2_isblock(args, &v); 312 if (rval) 313 goto out_free; 314 if (v) { 315 rval = xfs_dir2_block_addname(args); 316 goto out_free; 317 } 318 319 rval = xfs_dir2_isleaf(args, &v); 320 if (rval) 321 goto out_free; 322 if (v) 323 rval = xfs_dir2_leaf_addname(args); 324 else 325 rval = xfs_dir2_node_addname(args); 326 327 out_free: 328 kmem_free(args); 329 return rval; 330 } 331 332 /* 333 * If doing a CI lookup and case-insensitive match, dup actual name into 334 * args.value. Return EEXIST for success (ie. name found) or an error. 335 */ 336 int 337 xfs_dir_cilookup_result( 338 struct xfs_da_args *args, 339 const unsigned char *name, 340 int len) 341 { 342 if (args->cmpresult == XFS_CMP_DIFFERENT) 343 return -ENOENT; 344 if (args->cmpresult != XFS_CMP_CASE || 345 !(args->op_flags & XFS_DA_OP_CILOOKUP)) 346 return -EEXIST; 347 348 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL); 349 if (!args->value) 350 return -ENOMEM; 351 352 memcpy(args->value, name, len); 353 args->valuelen = len; 354 return -EEXIST; 355 } 356 357 /* 358 * Lookup a name in a directory, give back the inode number. 359 * If ci_name is not NULL, returns the actual name in ci_name if it differs 360 * to name, or ci_name->name is set to NULL for an exact match. 361 */ 362 363 int 364 xfs_dir_lookup( 365 xfs_trans_t *tp, 366 xfs_inode_t *dp, 367 struct xfs_name *name, 368 xfs_ino_t *inum, /* out: inode number */ 369 struct xfs_name *ci_name) /* out: actual name if CI match */ 370 { 371 struct xfs_da_args *args; 372 int rval; 373 int v; /* type-checking value */ 374 int lock_mode; 375 376 ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 377 XFS_STATS_INC(dp->i_mount, xs_dir_lookup); 378 379 /* 380 * We need to use KM_NOFS here so that lockdep will not throw false 381 * positive deadlock warnings on a non-transactional lookup path. It is 382 * safe to recurse into inode recalim in that case, but lockdep can't 383 * easily be taught about it. Hence KM_NOFS avoids having to add more 384 * lockdep Doing this avoids having to add a bunch of lockdep class 385 * annotations into the reclaim path for the ilock. 386 */ 387 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS); 388 args->geo = dp->i_mount->m_dir_geo; 389 args->name = name->name; 390 args->namelen = name->len; 391 args->filetype = name->type; 392 args->hashval = dp->i_mount->m_dirnameops->hashname(name); 393 args->dp = dp; 394 args->whichfork = XFS_DATA_FORK; 395 args->trans = tp; 396 args->op_flags = XFS_DA_OP_OKNOENT; 397 if (ci_name) 398 args->op_flags |= XFS_DA_OP_CILOOKUP; 399 400 lock_mode = xfs_ilock_data_map_shared(dp); 401 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) { 402 rval = xfs_dir2_sf_lookup(args); 403 goto out_check_rval; 404 } 405 406 rval = xfs_dir2_isblock(args, &v); 407 if (rval) 408 goto out_free; 409 if (v) { 410 rval = xfs_dir2_block_lookup(args); 411 goto out_check_rval; 412 } 413 414 rval = xfs_dir2_isleaf(args, &v); 415 if (rval) 416 goto out_free; 417 if (v) 418 rval = xfs_dir2_leaf_lookup(args); 419 else 420 rval = xfs_dir2_node_lookup(args); 421 422 out_check_rval: 423 if (rval == -EEXIST) 424 rval = 0; 425 if (!rval) { 426 *inum = args->inumber; 427 if (ci_name) { 428 ci_name->name = args->value; 429 ci_name->len = args->valuelen; 430 } 431 } 432 out_free: 433 xfs_iunlock(dp, lock_mode); 434 kmem_free(args); 435 return rval; 436 } 437 438 /* 439 * Remove an entry from a directory. 440 */ 441 int 442 xfs_dir_removename( 443 xfs_trans_t *tp, 444 xfs_inode_t *dp, 445 struct xfs_name *name, 446 xfs_ino_t ino, 447 xfs_fsblock_t *first, /* bmap's firstblock */ 448 struct xfs_defer_ops *dfops, /* bmap's freeblock list */ 449 xfs_extlen_t total) /* bmap's total block count */ 450 { 451 struct xfs_da_args *args; 452 int rval; 453 int v; /* type-checking value */ 454 455 ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 456 XFS_STATS_INC(dp->i_mount, xs_dir_remove); 457 458 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS); 459 if (!args) 460 return -ENOMEM; 461 462 args->geo = dp->i_mount->m_dir_geo; 463 args->name = name->name; 464 args->namelen = name->len; 465 args->filetype = name->type; 466 args->hashval = dp->i_mount->m_dirnameops->hashname(name); 467 args->inumber = ino; 468 args->dp = dp; 469 args->firstblock = first; 470 args->dfops = dfops; 471 args->total = total; 472 args->whichfork = XFS_DATA_FORK; 473 args->trans = tp; 474 475 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) { 476 rval = xfs_dir2_sf_removename(args); 477 goto out_free; 478 } 479 480 rval = xfs_dir2_isblock(args, &v); 481 if (rval) 482 goto out_free; 483 if (v) { 484 rval = xfs_dir2_block_removename(args); 485 goto out_free; 486 } 487 488 rval = xfs_dir2_isleaf(args, &v); 489 if (rval) 490 goto out_free; 491 if (v) 492 rval = xfs_dir2_leaf_removename(args); 493 else 494 rval = xfs_dir2_node_removename(args); 495 out_free: 496 kmem_free(args); 497 return rval; 498 } 499 500 /* 501 * Replace the inode number of a directory entry. 502 */ 503 int 504 xfs_dir_replace( 505 xfs_trans_t *tp, 506 xfs_inode_t *dp, 507 struct xfs_name *name, /* name of entry to replace */ 508 xfs_ino_t inum, /* new inode number */ 509 xfs_fsblock_t *first, /* bmap's firstblock */ 510 struct xfs_defer_ops *dfops, /* bmap's freeblock list */ 511 xfs_extlen_t total) /* bmap's total block count */ 512 { 513 struct xfs_da_args *args; 514 int rval; 515 int v; /* type-checking value */ 516 517 ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); 518 519 rval = xfs_dir_ino_validate(tp->t_mountp, inum); 520 if (rval) 521 return rval; 522 523 args = kmem_zalloc(sizeof(*args), KM_SLEEP | KM_NOFS); 524 if (!args) 525 return -ENOMEM; 526 527 args->geo = dp->i_mount->m_dir_geo; 528 args->name = name->name; 529 args->namelen = name->len; 530 args->filetype = name->type; 531 args->hashval = dp->i_mount->m_dirnameops->hashname(name); 532 args->inumber = inum; 533 args->dp = dp; 534 args->firstblock = first; 535 args->dfops = dfops; 536 args->total = total; 537 args->whichfork = XFS_DATA_FORK; 538 args->trans = tp; 539 540 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) { 541 rval = xfs_dir2_sf_replace(args); 542 goto out_free; 543 } 544 545 rval = xfs_dir2_isblock(args, &v); 546 if (rval) 547 goto out_free; 548 if (v) { 549 rval = xfs_dir2_block_replace(args); 550 goto out_free; 551 } 552 553 rval = xfs_dir2_isleaf(args, &v); 554 if (rval) 555 goto out_free; 556 if (v) 557 rval = xfs_dir2_leaf_replace(args); 558 else 559 rval = xfs_dir2_node_replace(args); 560 out_free: 561 kmem_free(args); 562 return rval; 563 } 564 565 /* 566 * See if this entry can be added to the directory without allocating space. 567 */ 568 int 569 xfs_dir_canenter( 570 xfs_trans_t *tp, 571 xfs_inode_t *dp, 572 struct xfs_name *name) /* name of entry to add */ 573 { 574 return xfs_dir_createname(tp, dp, name, 0, NULL, NULL, 0); 575 } 576 577 /* 578 * Utility routines. 579 */ 580 581 /* 582 * Add a block to the directory. 583 * 584 * This routine is for data and free blocks, not leaf/node blocks which are 585 * handled by xfs_da_grow_inode. 586 */ 587 int 588 xfs_dir2_grow_inode( 589 struct xfs_da_args *args, 590 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */ 591 xfs_dir2_db_t *dbp) /* out: block number added */ 592 { 593 struct xfs_inode *dp = args->dp; 594 struct xfs_mount *mp = dp->i_mount; 595 xfs_fileoff_t bno; /* directory offset of new block */ 596 int count; /* count of filesystem blocks */ 597 int error; 598 599 trace_xfs_dir2_grow_inode(args, space); 600 601 /* 602 * Set lowest possible block in the space requested. 603 */ 604 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE); 605 count = args->geo->fsbcount; 606 607 error = xfs_da_grow_inode_int(args, &bno, count); 608 if (error) 609 return error; 610 611 *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno); 612 613 /* 614 * Update file's size if this is the data space and it grew. 615 */ 616 if (space == XFS_DIR2_DATA_SPACE) { 617 xfs_fsize_t size; /* directory file (data) size */ 618 619 size = XFS_FSB_TO_B(mp, bno + count); 620 if (size > dp->i_d.di_size) { 621 dp->i_d.di_size = size; 622 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE); 623 } 624 } 625 return 0; 626 } 627 628 /* 629 * See if the directory is a single-block form directory. 630 */ 631 int 632 xfs_dir2_isblock( 633 struct xfs_da_args *args, 634 int *vp) /* out: 1 is block, 0 is not block */ 635 { 636 xfs_fileoff_t last; /* last file offset */ 637 int rval; 638 639 if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK))) 640 return rval; 641 rval = XFS_FSB_TO_B(args->dp->i_mount, last) == args->geo->blksize; 642 if (rval != 0 && args->dp->i_d.di_size != args->geo->blksize) 643 return -EFSCORRUPTED; 644 *vp = rval; 645 return 0; 646 } 647 648 /* 649 * See if the directory is a single-leaf form directory. 650 */ 651 int 652 xfs_dir2_isleaf( 653 struct xfs_da_args *args, 654 int *vp) /* out: 1 is block, 0 is not block */ 655 { 656 xfs_fileoff_t last; /* last file offset */ 657 int rval; 658 659 if ((rval = xfs_bmap_last_offset(args->dp, &last, XFS_DATA_FORK))) 660 return rval; 661 *vp = last == args->geo->leafblk + args->geo->fsbcount; 662 return 0; 663 } 664 665 /* 666 * Remove the given block from the directory. 667 * This routine is used for data and free blocks, leaf/node are done 668 * by xfs_da_shrink_inode. 669 */ 670 int 671 xfs_dir2_shrink_inode( 672 xfs_da_args_t *args, 673 xfs_dir2_db_t db, 674 struct xfs_buf *bp) 675 { 676 xfs_fileoff_t bno; /* directory file offset */ 677 xfs_dablk_t da; /* directory file offset */ 678 int done; /* bunmap is finished */ 679 xfs_inode_t *dp; 680 int error; 681 xfs_mount_t *mp; 682 xfs_trans_t *tp; 683 684 trace_xfs_dir2_shrink_inode(args, db); 685 686 dp = args->dp; 687 mp = dp->i_mount; 688 tp = args->trans; 689 da = xfs_dir2_db_to_da(args->geo, db); 690 691 /* Unmap the fsblock(s). */ 692 error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount, 0, 0, 693 args->firstblock, args->dfops, &done); 694 if (error) { 695 /* 696 * ENOSPC actually can happen if we're in a removename with no 697 * space reservation, and the resulting block removal would 698 * cause a bmap btree split or conversion from extents to btree. 699 * This can only happen for un-fragmented directory blocks, 700 * since you need to be punching out the middle of an extent. 701 * In this case we need to leave the block in the file, and not 702 * binval it. So the block has to be in a consistent empty 703 * state and appropriately logged. We don't free up the buffer, 704 * the caller can tell it hasn't happened since it got an error 705 * back. 706 */ 707 return error; 708 } 709 ASSERT(done); 710 /* 711 * Invalidate the buffer from the transaction. 712 */ 713 xfs_trans_binval(tp, bp); 714 /* 715 * If it's not a data block, we're done. 716 */ 717 if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET)) 718 return 0; 719 /* 720 * If the block isn't the last one in the directory, we're done. 721 */ 722 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0)) 723 return 0; 724 bno = da; 725 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) { 726 /* 727 * This can't really happen unless there's kernel corruption. 728 */ 729 return error; 730 } 731 if (db == args->geo->datablk) 732 ASSERT(bno == 0); 733 else 734 ASSERT(bno > 0); 735 /* 736 * Set the size to the new last block. 737 */ 738 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno); 739 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); 740 return 0; 741 } 742