fs/xfs/xfs_dir2.c

   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_types.h"
  21 #include "xfs_bit.h"
  22 #include "xfs_log.h"
  23 #include "xfs_inum.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_dir2.h"
  28 #include "xfs_dmapi.h"
  29 #include "xfs_mount.h"
  30 #include "xfs_da_btree.h"
  31 #include "xfs_bmap_btree.h"
  32 #include "xfs_alloc_btree.h"
  33 #include "xfs_dir2_sf.h"
  34 #include "xfs_attr_sf.h"
  35 #include "xfs_dinode.h"
  36 #include "xfs_inode.h"
  37 #include "xfs_inode_item.h"
  38 #include "xfs_bmap.h"
  39 #include "xfs_dir2_data.h"
  40 #include "xfs_dir2_leaf.h"
  41 #include "xfs_dir2_block.h"
  42 #include "xfs_dir2_node.h"
  43 #include "xfs_dir2_trace.h"
  44 #include "xfs_error.h"
  45
  46
  47 void
  48 xfs_dir_mount(
  49         xfs_mount_t     *mp)
  50 {
  51         ASSERT(XFS_SB_VERSION_HASDIRV2(&mp->m_sb));
  52         ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
  53                XFS_MAX_BLOCKSIZE);
  54         mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
  55         mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
  56         mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
  57         mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
  58         mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
  59         mp->m_attr_node_ents =
  60                 (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
  61                 (uint)sizeof(xfs_da_node_entry_t);
  62         mp->m_dir_node_ents =
  63                 (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
  64                 (uint)sizeof(xfs_da_node_entry_t);
  65         mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
  66 }
  67
  68 /*
  69  * Return 1 if directory contains only "." and "..".
  70  */
  71 int
  72 xfs_dir_isempty(
  73         xfs_inode_t     *dp)
  74 {
  75         xfs_dir2_sf_t   *sfp;
  76
  77         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
  78         if (dp->i_d.di_size == 0)       /* might happen during shutdown. */
  79                 return 1;
  80         if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
  81                 return 0;
  82         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
  83         return !sfp->hdr.count;
  84 }
  85
  86 /*
  87  * Validate a given inode number.
  88  */
  89 int
  90 xfs_dir_ino_validate(
  91         xfs_mount_t     *mp,
  92         xfs_ino_t       ino)
  93 {
  94         xfs_agblock_t   agblkno;
  95         xfs_agino_t     agino;
  96         xfs_agnumber_t  agno;
  97         int             ino_ok;
  98         int             ioff;
  99
 100         agno = XFS_INO_TO_AGNO(mp, ino);
 101         agblkno = XFS_INO_TO_AGBNO(mp, ino);
 102         ioff = XFS_INO_TO_OFFSET(mp, ino);
 103         agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
 104         ino_ok =
 105                 agno < mp->m_sb.sb_agcount &&
 106                 agblkno < mp->m_sb.sb_agblocks &&
 107                 agblkno != 0 &&
 108                 ioff < (1 << mp->m_sb.sb_inopblog) &&
 109                 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
 110         if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
 111                         XFS_RANDOM_DIR_INO_VALIDATE))) {
 112                 xfs_fs_cmn_err(CE_WARN, mp, "Invalid inode number 0x%Lx",
 113                                 (unsigned long long) ino);
 114                 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
 115                 return XFS_ERROR(EFSCORRUPTED);
 116         }
 117         return 0;
 118 }
 119
 120 /*
 121  * Initialize a directory with its "." and ".." entries.
 122  */
 123 int
 124 xfs_dir_init(
 125         xfs_trans_t     *tp,
 126         xfs_inode_t     *dp,
 127         xfs_inode_t     *pdp)
 128 {
 129         xfs_da_args_t   args;
 130         int             error;
 131
 132         memset((char *)&args, 0, sizeof(args));
 133         args.dp = dp;
 134         args.trans = tp;
 135         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 136         if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
 137                 return error;
 138         return xfs_dir2_sf_create(&args, pdp->i_ino);
 139 }
 140
 141 /*
 142   Enter a name in a directory.
 143  */
 144 int
 145 xfs_dir_createname(
 146         xfs_trans_t             *tp,
 147         xfs_inode_t             *dp,
 148         char                    *name,
 149         int                     namelen,
 150         xfs_ino_t               inum,           /* new entry inode number */
 151         xfs_fsblock_t           *first,         /* bmap's firstblock */
 152         xfs_bmap_free_t         *flist,         /* bmap's freeblock list */
 153         xfs_extlen_t            total)          /* bmap's total block count */
 154 {
 155         xfs_da_args_t           args;
 156         int                     rval;
 157         int                     v;              /* type-checking value */
 158
 159         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 160         if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
 161                 return rval;
 162         XFS_STATS_INC(xs_dir_create);
 163
 164         args.name = name;
 165         args.namelen = namelen;
 166         args.hashval = xfs_da_hashname(name, namelen);
 167         args.inumber = inum;
 168         args.dp = dp;
 169         args.firstblock = first;
 170         args.flist = flist;
 171         args.total = total;
 172         args.whichfork = XFS_DATA_FORK;
 173         args.trans = tp;
 174         args.justcheck = 0;
 175         args.addname = args.oknoent = 1;
 176
 177         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 178                 rval = xfs_dir2_sf_addname(&args);
 179         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 180                 return rval;
 181         else if (v)
 182                 rval = xfs_dir2_block_addname(&args);
 183         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 184                 return rval;
 185         else if (v)
 186                 rval = xfs_dir2_leaf_addname(&args);
 187         else
 188                 rval = xfs_dir2_node_addname(&args);
 189         return rval;
 190 }
 191
 192 /*
 193  * Lookup a name in a directory, give back the inode number.
 194  */
 195 int
 196 xfs_dir_lookup(
 197         xfs_trans_t     *tp,
 198         xfs_inode_t     *dp,
 199         char            *name,
 200         int             namelen,
 201         xfs_ino_t       *inum)          /* out: inode number */
 202 {
 203         xfs_da_args_t   args;
 204         int             rval;
 205         int             v;              /* type-checking value */
 206
 207         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 208         XFS_STATS_INC(xs_dir_lookup);
 209
 210         args.name = name;
 211         args.namelen = namelen;
 212         args.hashval = xfs_da_hashname(name, namelen);
 213         args.inumber = 0;
 214         args.dp = dp;
 215         args.firstblock = NULL;
 216         args.flist = NULL;
 217         args.total = 0;
 218         args.whichfork = XFS_DATA_FORK;
 219         args.trans = tp;
 220         args.justcheck = args.addname = 0;
 221         args.oknoent = 1;
 222
 223         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 224                 rval = xfs_dir2_sf_lookup(&args);
 225         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 226                 return rval;
 227         else if (v)
 228                 rval = xfs_dir2_block_lookup(&args);
 229         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 230                 return rval;
 231         else if (v)
 232                 rval = xfs_dir2_leaf_lookup(&args);
 233         else
 234                 rval = xfs_dir2_node_lookup(&args);
 235         if (rval == EEXIST)
 236                 rval = 0;
 237         if (rval == 0)
 238                 *inum = args.inumber;
 239         return rval;
 240 }
 241
 242 /*
 243  * Remove an entry from a directory.
 244  */
 245 int
 246 xfs_dir_removename(
 247         xfs_trans_t     *tp,
 248         xfs_inode_t     *dp,
 249         char            *name,
 250         int             namelen,
 251         xfs_ino_t       ino,
 252         xfs_fsblock_t   *first,         /* bmap's firstblock */
 253         xfs_bmap_free_t *flist,         /* bmap's freeblock list */
 254         xfs_extlen_t    total)          /* bmap's total block count */
 255 {
 256         xfs_da_args_t   args;
 257         int             rval;
 258         int             v;              /* type-checking value */
 259
 260         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 261         XFS_STATS_INC(xs_dir_remove);
 262
 263         args.name = name;
 264         args.namelen = namelen;
 265         args.hashval = xfs_da_hashname(name, namelen);
 266         args.inumber = ino;
 267         args.dp = dp;
 268         args.firstblock = first;
 269         args.flist = flist;
 270         args.total = total;
 271         args.whichfork = XFS_DATA_FORK;
 272         args.trans = tp;
 273         args.justcheck = args.addname = args.oknoent = 0;
 274
 275         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 276                 rval = xfs_dir2_sf_removename(&args);
 277         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 278                 return rval;
 279         else if (v)
 280                 rval = xfs_dir2_block_removename(&args);
 281         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 282                 return rval;
 283         else if (v)
 284                 rval = xfs_dir2_leaf_removename(&args);
 285         else
 286                 rval = xfs_dir2_node_removename(&args);
 287         return rval;
 288 }
 289
 290 /*
 291  * Read a directory.
 292  */
 293 int
 294 xfs_readdir(
 295         xfs_inode_t     *dp,
 296         void            *dirent,
 297         size_t          bufsize,
 298         xfs_off_t       *offset,
 299         filldir_t       filldir)
 300 {
 301         int             rval;           /* return value */
 302         int             v;              /* type-checking value */
 303
 304         vn_trace_entry(dp, __FUNCTION__, (inst_t *)__return_address);
 305
 306         if (XFS_FORCED_SHUTDOWN(dp->i_mount))
 307                 return XFS_ERROR(EIO);
 308
 309         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 310         XFS_STATS_INC(xs_dir_getdents);
 311
 312         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 313                 rval = xfs_dir2_sf_getdents(dp, dirent, offset, filldir);
 314         else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
 315                 ;
 316         else if (v)
 317                 rval = xfs_dir2_block_getdents(dp, dirent, offset, filldir);
 318         else
 319                 rval = xfs_dir2_leaf_getdents(dp, dirent, bufsize, offset,
 320                                               filldir);
 321         return rval;
 322 }
 323
 324 /*
 325  * Replace the inode number of a directory entry.
 326  */
 327 int
 328 xfs_dir_replace(
 329         xfs_trans_t     *tp,
 330         xfs_inode_t     *dp,
 331         char            *name,          /* name of entry to replace */
 332         int             namelen,
 333         xfs_ino_t       inum,           /* new inode number */
 334         xfs_fsblock_t   *first,         /* bmap's firstblock */
 335         xfs_bmap_free_t *flist,         /* bmap's freeblock list */
 336         xfs_extlen_t    total)          /* bmap's total block count */
 337 {
 338         xfs_da_args_t   args;
 339         int             rval;
 340         int             v;              /* type-checking value */
 341
 342         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 343
 344         if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
 345                 return rval;
 346
 347         args.name = name;
 348         args.namelen = namelen;
 349         args.hashval = xfs_da_hashname(name, namelen);
 350         args.inumber = inum;
 351         args.dp = dp;
 352         args.firstblock = first;
 353         args.flist = flist;
 354         args.total = total;
 355         args.whichfork = XFS_DATA_FORK;
 356         args.trans = tp;
 357         args.justcheck = args.addname = args.oknoent = 0;
 358
 359         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 360                 rval = xfs_dir2_sf_replace(&args);
 361         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 362                 return rval;
 363         else if (v)
 364                 rval = xfs_dir2_block_replace(&args);
 365         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 366                 return rval;
 367         else if (v)
 368                 rval = xfs_dir2_leaf_replace(&args);
 369         else
 370                 rval = xfs_dir2_node_replace(&args);
 371         return rval;
 372 }
 373
 374 /*
 375  * See if this entry can be added to the directory without allocating space.
 376  */
 377 int
 378 xfs_dir_canenter(
 379         xfs_trans_t     *tp,
 380         xfs_inode_t     *dp,
 381         char            *name,          /* name of entry to add */
 382         int             namelen)
 383 {
 384         xfs_da_args_t   args;
 385         int             rval;
 386         int             v;              /* type-checking value */
 387
 388         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 389
 390         args.name = name;
 391         args.namelen = namelen;
 392         args.hashval = xfs_da_hashname(name, namelen);
 393         args.inumber = 0;
 394         args.dp = dp;
 395         args.firstblock = NULL;
 396         args.flist = NULL;
 397         args.total = 0;
 398         args.whichfork = XFS_DATA_FORK;
 399         args.trans = tp;
 400         args.justcheck = args.addname = args.oknoent = 1;
 401
 402         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 403                 rval = xfs_dir2_sf_addname(&args);
 404         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 405                 return rval;
 406         else if (v)
 407                 rval = xfs_dir2_block_addname(&args);
 408         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 409                 return rval;
 410         else if (v)
 411                 rval = xfs_dir2_leaf_addname(&args);
 412         else
 413                 rval = xfs_dir2_node_addname(&args);
 414         return rval;
 415 }
 416
 417 /*
 418  * Utility routines.
 419  */
 420
 421 /*
 422  * Add a block to the directory.
 423  * This routine is for data and free blocks, not leaf/node blocks
 424  * which are handled by xfs_da_grow_inode.
 425  */
 426 int
 427 xfs_dir2_grow_inode(
 428         xfs_da_args_t   *args,
 429         int             space,          /* v2 dir's space XFS_DIR2_xxx_SPACE */
 430         xfs_dir2_db_t   *dbp)           /* out: block number added */
 431 {
 432         xfs_fileoff_t   bno;            /* directory offset of new block */
 433         int             count;          /* count of filesystem blocks */
 434         xfs_inode_t     *dp;            /* incore directory inode */
 435         int             error;
 436         int             got;            /* blocks actually mapped */
 437         int             i;
 438         xfs_bmbt_irec_t map;            /* single structure for bmap */
 439         int             mapi;           /* mapping index */
 440         xfs_bmbt_irec_t *mapp;          /* bmap mapping structure(s) */
 441         xfs_mount_t     *mp;
 442         int             nmap;           /* number of bmap entries */
 443         xfs_trans_t     *tp;
 444
 445         xfs_dir2_trace_args_s("grow_inode", args, space);
 446         dp = args->dp;
 447         tp = args->trans;
 448         mp = dp->i_mount;
 449         /*
 450          * Set lowest possible block in the space requested.
 451          */
 452         bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
 453         count = mp->m_dirblkfsbs;
 454         /*
 455          * Find the first hole for our block.
 456          */
 457         if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK)))
 458                 return error;
 459         nmap = 1;
 460         ASSERT(args->firstblock != NULL);
 461         /*
 462          * Try mapping the new block contiguously (one extent).
 463          */
 464         if ((error = xfs_bmapi(tp, dp, bno, count,
 465                         XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
 466                         args->firstblock, args->total, &map, &nmap,
 467                         args->flist, NULL)))
 468                 return error;
 469         ASSERT(nmap <= 1);
 470         if (nmap == 1) {
 471                 mapp = &map;
 472                 mapi = 1;
 473         }
 474         /*
 475          * Didn't work and this is a multiple-fsb directory block.
 476          * Try again with contiguous flag turned on.
 477          */
 478         else if (nmap == 0 && count > 1) {
 479                 xfs_fileoff_t   b;      /* current file offset */
 480
 481                 /*
 482                  * Space for maximum number of mappings.
 483                  */
 484                 mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
 485                 /*
 486                  * Iterate until we get to the end of our block.
 487                  */
 488                 for (b = bno, mapi = 0; b < bno + count; ) {
 489                         int     c;      /* current fsb count */
 490
 491                         /*
 492                          * Can't map more than MAX_NMAP at once.
 493                          */
 494                         nmap = MIN(XFS_BMAP_MAX_NMAP, count);
 495                         c = (int)(bno + count - b);
 496                         if ((error = xfs_bmapi(tp, dp, b, c,
 497                                         XFS_BMAPI_WRITE|XFS_BMAPI_METADATA,
 498                                         args->firstblock, args->total,
 499                                         &mapp[mapi], &nmap, args->flist,
 500                                         NULL))) {
 501                                 kmem_free(mapp, sizeof(*mapp) * count);
 502                                 return error;
 503                         }
 504                         if (nmap < 1)
 505                                 break;
 506                         /*
 507                          * Add this bunch into our table, go to the next offset.
 508                          */
 509                         mapi += nmap;
 510                         b = mapp[mapi - 1].br_startoff +
 511                             mapp[mapi - 1].br_blockcount;
 512                 }
 513         }
 514         /*
 515          * Didn't work.
 516          */
 517         else {
 518                 mapi = 0;
 519                 mapp = NULL;
 520         }
 521         /*
 522          * See how many fsb's we got.
 523          */
 524         for (i = 0, got = 0; i < mapi; i++)
 525                 got += mapp[i].br_blockcount;
 526         /*
 527          * Didn't get enough fsb's, or the first/last block's are wrong.
 528          */
 529         if (got != count || mapp[0].br_startoff != bno ||
 530             mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
 531             bno + count) {
 532                 if (mapp != &map)
 533                         kmem_free(mapp, sizeof(*mapp) * count);
 534                 return XFS_ERROR(ENOSPC);
 535         }
 536         /*
 537          * Done with the temporary mapping table.
 538          */
 539         if (mapp != &map)
 540                 kmem_free(mapp, sizeof(*mapp) * count);
 541         *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
 542         /*
 543          * Update file's size if this is the data space and it grew.
 544          */
 545         if (space == XFS_DIR2_DATA_SPACE) {
 546                 xfs_fsize_t     size;           /* directory file (data) size */
 547
 548                 size = XFS_FSB_TO_B(mp, bno + count);
 549                 if (size > dp->i_d.di_size) {
 550                         dp->i_d.di_size = size;
 551                         xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
 552                 }
 553         }
 554         return 0;
 555 }
 556
 557 /*
 558  * See if the directory is a single-block form directory.
 559  */
 560 int
 561 xfs_dir2_isblock(
 562         xfs_trans_t     *tp,
 563         xfs_inode_t     *dp,
 564         int             *vp)            /* out: 1 is block, 0 is not block */
 565 {
 566         xfs_fileoff_t   last;           /* last file offset */
 567         xfs_mount_t     *mp;
 568         int             rval;
 569
 570         mp = dp->i_mount;
 571         if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
 572                 return rval;
 573         rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
 574         ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
 575         *vp = rval;
 576         return 0;
 577 }
 578
 579 /*
 580  * See if the directory is a single-leaf form directory.
 581  */
 582 int
 583 xfs_dir2_isleaf(
 584         xfs_trans_t     *tp,
 585         xfs_inode_t     *dp,
 586         int             *vp)            /* out: 1 is leaf, 0 is not leaf */
 587 {
 588         xfs_fileoff_t   last;           /* last file offset */
 589         xfs_mount_t     *mp;
 590         int             rval;
 591
 592         mp = dp->i_mount;
 593         if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
 594                 return rval;
 595         *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
 596         return 0;
 597 }
 598
 599 /*
 600  * Remove the given block from the directory.
 601  * This routine is used for data and free blocks, leaf/node are done
 602  * by xfs_da_shrink_inode.
 603  */
 604 int
 605 xfs_dir2_shrink_inode(
 606         xfs_da_args_t   *args,
 607         xfs_dir2_db_t   db,
 608         xfs_dabuf_t     *bp)
 609 {
 610         xfs_fileoff_t   bno;            /* directory file offset */
 611         xfs_dablk_t     da;             /* directory file offset */
 612         int             done;           /* bunmap is finished */
 613         xfs_inode_t     *dp;
 614         int             error;
 615         xfs_mount_t     *mp;
 616         xfs_trans_t     *tp;
 617
 618         xfs_dir2_trace_args_db("shrink_inode", args, db, bp);
 619         dp = args->dp;
 620         mp = dp->i_mount;
 621         tp = args->trans;
 622         da = xfs_dir2_db_to_da(mp, db);
 623         /*
 624          * Unmap the fsblock(s).
 625          */
 626         if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
 627                         XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
 628                         NULL, &done))) {
 629                 /*
 630                  * ENOSPC actually can happen if we're in a removename with
 631                  * no space reservation, and the resulting block removal
 632                  * would cause a bmap btree split or conversion from extents
 633                  * to btree.  This can only happen for un-fragmented
 634                  * directory blocks, since you need to be punching out
 635                  * the middle of an extent.
 636                  * In this case we need to leave the block in the file,
 637                  * and not binval it.
 638                  * So the block has to be in a consistent empty state
 639                  * and appropriately logged.
 640                  * We don't free up the buffer, the caller can tell it
 641                  * hasn't happened since it got an error back.
 642                  */
 643                 return error;
 644         }
 645         ASSERT(done);
 646         /*
 647          * Invalidate the buffer from the transaction.
 648          */
 649         xfs_da_binval(tp, bp);
 650         /*
 651          * If it's not a data block, we're done.
 652          */
 653         if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
 654                 return 0;
 655         /*
 656          * If the block isn't the last one in the directory, we're done.
 657          */
 658         if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
 659                 return 0;
 660         bno = da;
 661         if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
 662                 /*
 663                  * This can't really happen unless there's kernel corruption.
 664                  */
 665                 return error;
 666         }
 667         if (db == mp->m_dirdatablk)
 668                 ASSERT(bno == 0);
 669         else
 670                 ASSERT(bno > 0);
 671         /*
 672          * Set the size to the new last block.
 673          */
 674         dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
 675         xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
 676         return 0;
 677 }