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 #include "xfs_vnodeops.h"
  46
  47
  48 void
  49 xfs_dir_mount(
  50         xfs_mount_t     *mp)
  51 {
  52         ASSERT(XFS_SB_VERSION_HASDIRV2(&mp->m_sb));
  53         ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
  54                XFS_MAX_BLOCKSIZE);
  55         mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
  56         mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
  57         mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
  58         mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
  59         mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
  60         mp->m_attr_node_ents =
  61                 (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
  62                 (uint)sizeof(xfs_da_node_entry_t);
  63         mp->m_dir_node_ents =
  64                 (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
  65                 (uint)sizeof(xfs_da_node_entry_t);
  66         mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
  67 }
  68
  69 /*
  70  * Return 1 if directory contains only "." and "..".
  71  */
  72 int
  73 xfs_dir_isempty(
  74         xfs_inode_t     *dp)
  75 {
  76         xfs_dir2_sf_t   *sfp;
  77
  78         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
  79         if (dp->i_d.di_size == 0)       /* might happen during shutdown. */
  80                 return 1;
  81         if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
  82                 return 0;
  83         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
  84         return !sfp->hdr.count;
  85 }
  86
  87 /*
  88  * Validate a given inode number.
  89  */
  90 int
  91 xfs_dir_ino_validate(
  92         xfs_mount_t     *mp,
  93         xfs_ino_t       ino)
  94 {
  95         xfs_agblock_t   agblkno;
  96         xfs_agino_t     agino;
  97         xfs_agnumber_t  agno;
  98         int             ino_ok;
  99         int             ioff;
 100
 101         agno = XFS_INO_TO_AGNO(mp, ino);
 102         agblkno = XFS_INO_TO_AGBNO(mp, ino);
 103         ioff = XFS_INO_TO_OFFSET(mp, ino);
 104         agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
 105         ino_ok =
 106                 agno < mp->m_sb.sb_agcount &&
 107                 agblkno < mp->m_sb.sb_agblocks &&
 108                 agblkno != 0 &&
 109                 ioff < (1 << mp->m_sb.sb_inopblog) &&
 110                 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
 111         if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
 112                         XFS_RANDOM_DIR_INO_VALIDATE))) {
 113                 xfs_fs_cmn_err(CE_WARN, mp, "Invalid inode number 0x%Lx",
 114                                 (unsigned long long) ino);
 115                 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
 116                 return XFS_ERROR(EFSCORRUPTED);
 117         }
 118         return 0;
 119 }
 120
 121 /*
 122  * Initialize a directory with its "." and ".." entries.
 123  */
 124 int
 125 xfs_dir_init(
 126         xfs_trans_t     *tp,
 127         xfs_inode_t     *dp,
 128         xfs_inode_t     *pdp)
 129 {
 130         xfs_da_args_t   args;
 131         int             error;
 132
 133         memset((char *)&args, 0, sizeof(args));
 134         args.dp = dp;
 135         args.trans = tp;
 136         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 137         if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
 138                 return error;
 139         return xfs_dir2_sf_create(&args, pdp->i_ino);
 140 }
 141
 142 /*
 143   Enter a name in a directory.
 144  */
 145 int
 146 xfs_dir_createname(
 147         xfs_trans_t             *tp,
 148         xfs_inode_t             *dp,
 149         char                    *name,
 150         int                     namelen,
 151         xfs_ino_t               inum,           /* new entry inode number */
 152         xfs_fsblock_t           *first,         /* bmap's firstblock */
 153         xfs_bmap_free_t         *flist,         /* bmap's freeblock list */
 154         xfs_extlen_t            total)          /* bmap's total block count */
 155 {
 156         xfs_da_args_t           args;
 157         int                     rval;
 158         int                     v;              /* type-checking value */
 159
 160         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 161         if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
 162                 return rval;
 163         XFS_STATS_INC(xs_dir_create);
 164
 165         args.name = name;
 166         args.namelen = namelen;
 167         args.hashval = xfs_da_hashname(name, namelen);
 168         args.inumber = inum;
 169         args.dp = dp;
 170         args.firstblock = first;
 171         args.flist = flist;
 172         args.total = total;
 173         args.whichfork = XFS_DATA_FORK;
 174         args.trans = tp;
 175         args.justcheck = 0;
 176         args.addname = args.oknoent = 1;
 177
 178         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 179                 rval = xfs_dir2_sf_addname(&args);
 180         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 181                 return rval;
 182         else if (v)
 183                 rval = xfs_dir2_block_addname(&args);
 184         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 185                 return rval;
 186         else if (v)
 187                 rval = xfs_dir2_leaf_addname(&args);
 188         else
 189                 rval = xfs_dir2_node_addname(&args);
 190         return rval;
 191 }
 192
 193 /*
 194  * Lookup a name in a directory, give back the inode number.
 195  */
 196 int
 197 xfs_dir_lookup(
 198         xfs_trans_t     *tp,
 199         xfs_inode_t     *dp,
 200         char            *name,
 201         int             namelen,
 202         xfs_ino_t       *inum)          /* out: inode number */
 203 {
 204         xfs_da_args_t   args;
 205         int             rval;
 206         int             v;              /* type-checking value */
 207
 208         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 209         XFS_STATS_INC(xs_dir_lookup);
 210
 211         args.name = name;
 212         args.namelen = namelen;
 213         args.hashval = xfs_da_hashname(name, namelen);
 214         args.inumber = 0;
 215         args.dp = dp;
 216         args.firstblock = NULL;
 217         args.flist = NULL;
 218         args.total = 0;
 219         args.whichfork = XFS_DATA_FORK;
 220         args.trans = tp;
 221         args.justcheck = args.addname = 0;
 222         args.oknoent = 1;
 223
 224         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 225                 rval = xfs_dir2_sf_lookup(&args);
 226         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 227                 return rval;
 228         else if (v)
 229                 rval = xfs_dir2_block_lookup(&args);
 230         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 231                 return rval;
 232         else if (v)
 233                 rval = xfs_dir2_leaf_lookup(&args);
 234         else
 235                 rval = xfs_dir2_node_lookup(&args);
 236         if (rval == EEXIST)
 237                 rval = 0;
 238         if (rval == 0)
 239                 *inum = args.inumber;
 240         return rval;
 241 }
 242
 243 /*
 244  * Remove an entry from a directory.
 245  */
 246 int
 247 xfs_dir_removename(
 248         xfs_trans_t     *tp,
 249         xfs_inode_t     *dp,
 250         char            *name,
 251         int             namelen,
 252         xfs_ino_t       ino,
 253         xfs_fsblock_t   *first,         /* bmap's firstblock */
 254         xfs_bmap_free_t *flist,         /* bmap's freeblock list */
 255         xfs_extlen_t    total)          /* bmap's total block count */
 256 {
 257         xfs_da_args_t   args;
 258         int             rval;
 259         int             v;              /* type-checking value */
 260
 261         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 262         XFS_STATS_INC(xs_dir_remove);
 263
 264         args.name = name;
 265         args.namelen = namelen;
 266         args.hashval = xfs_da_hashname(name, namelen);
 267         args.inumber = ino;
 268         args.dp = dp;
 269         args.firstblock = first;
 270         args.flist = flist;
 271         args.total = total;
 272         args.whichfork = XFS_DATA_FORK;
 273         args.trans = tp;
 274         args.justcheck = args.addname = args.oknoent = 0;
 275
 276         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 277                 rval = xfs_dir2_sf_removename(&args);
 278         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 279                 return rval;
 280         else if (v)
 281                 rval = xfs_dir2_block_removename(&args);
 282         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 283                 return rval;
 284         else if (v)
 285                 rval = xfs_dir2_leaf_removename(&args);
 286         else
 287                 rval = xfs_dir2_node_removename(&args);
 288         return rval;
 289 }
 290
 291 /*
 292  * Read a directory.
 293  */
 294 int
 295 xfs_readdir(
 296         xfs_inode_t     *dp,
 297         void            *dirent,
 298         size_t          bufsize,
 299         xfs_off_t       *offset,
 300         filldir_t       filldir)
 301 {
 302         int             rval;           /* return value */
 303         int             v;              /* type-checking value */
 304
 305         xfs_itrace_entry(dp);
 306
 307         if (XFS_FORCED_SHUTDOWN(dp->i_mount))
 308                 return XFS_ERROR(EIO);
 309
 310         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 311         XFS_STATS_INC(xs_dir_getdents);
 312
 313         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 314                 rval = xfs_dir2_sf_getdents(dp, dirent, offset, filldir);
 315         else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
 316                 ;
 317         else if (v)
 318                 rval = xfs_dir2_block_getdents(dp, dirent, offset, filldir);
 319         else
 320                 rval = xfs_dir2_leaf_getdents(dp, dirent, bufsize, offset,
 321                                               filldir);
 322         return rval;
 323 }
 324
 325 /*
 326  * Replace the inode number of a directory entry.
 327  */
 328 int
 329 xfs_dir_replace(
 330         xfs_trans_t     *tp,
 331         xfs_inode_t     *dp,
 332         char            *name,          /* name of entry to replace */
 333         int             namelen,
 334         xfs_ino_t       inum,           /* new inode number */
 335         xfs_fsblock_t   *first,         /* bmap's firstblock */
 336         xfs_bmap_free_t *flist,         /* bmap's freeblock list */
 337         xfs_extlen_t    total)          /* bmap's total block count */
 338 {
 339         xfs_da_args_t   args;
 340         int             rval;
 341         int             v;              /* type-checking value */
 342
 343         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 344
 345         if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
 346                 return rval;
 347
 348         args.name = name;
 349         args.namelen = namelen;
 350         args.hashval = xfs_da_hashname(name, namelen);
 351         args.inumber = inum;
 352         args.dp = dp;
 353         args.firstblock = first;
 354         args.flist = flist;
 355         args.total = total;
 356         args.whichfork = XFS_DATA_FORK;
 357         args.trans = tp;
 358         args.justcheck = args.addname = args.oknoent = 0;
 359
 360         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 361                 rval = xfs_dir2_sf_replace(&args);
 362         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 363                 return rval;
 364         else if (v)
 365                 rval = xfs_dir2_block_replace(&args);
 366         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 367                 return rval;
 368         else if (v)
 369                 rval = xfs_dir2_leaf_replace(&args);
 370         else
 371                 rval = xfs_dir2_node_replace(&args);
 372         return rval;
 373 }
 374
 375 /*
 376  * See if this entry can be added to the directory without allocating space.
 377  */
 378 int
 379 xfs_dir_canenter(
 380         xfs_trans_t     *tp,
 381         xfs_inode_t     *dp,
 382         char            *name,          /* name of entry to add */
 383         int             namelen)
 384 {
 385         xfs_da_args_t   args;
 386         int             rval;
 387         int             v;              /* type-checking value */
 388
 389         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 390
 391         args.name = name;
 392         args.namelen = namelen;
 393         args.hashval = xfs_da_hashname(name, namelen);
 394         args.inumber = 0;
 395         args.dp = dp;
 396         args.firstblock = NULL;
 397         args.flist = NULL;
 398         args.total = 0;
 399         args.whichfork = XFS_DATA_FORK;
 400         args.trans = tp;
 401         args.justcheck = args.addname = args.oknoent = 1;
 402
 403         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 404                 rval = xfs_dir2_sf_addname(&args);
 405         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 406                 return rval;
 407         else if (v)
 408                 rval = xfs_dir2_block_addname(&args);
 409         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 410                 return rval;
 411         else if (v)
 412                 rval = xfs_dir2_leaf_addname(&args);
 413         else
 414                 rval = xfs_dir2_node_addname(&args);
 415         return rval;
 416 }
 417
 418 /*
 419  * Utility routines.
 420  */
 421
 422 /*
 423  * Add a block to the directory.
 424  * This routine is for data and free blocks, not leaf/node blocks
 425  * which are handled by xfs_da_grow_inode.
 426  */
 427 int
 428 xfs_dir2_grow_inode(
 429         xfs_da_args_t   *args,
 430         int             space,          /* v2 dir's space XFS_DIR2_xxx_SPACE */
 431         xfs_dir2_db_t   *dbp)           /* out: block number added */
 432 {
 433         xfs_fileoff_t   bno;            /* directory offset of new block */
 434         int             count;          /* count of filesystem blocks */
 435         xfs_inode_t     *dp;            /* incore directory inode */
 436         int             error;
 437         int             got;            /* blocks actually mapped */
 438         int             i;
 439         xfs_bmbt_irec_t map;            /* single structure for bmap */
 440         int             mapi;           /* mapping index */
 441         xfs_bmbt_irec_t *mapp;          /* bmap mapping structure(s) */
 442         xfs_mount_t     *mp;
 443         int             nmap;           /* number of bmap entries */
 444         xfs_trans_t     *tp;
 445
 446         xfs_dir2_trace_args_s("grow_inode", args, space);
 447         dp = args->dp;
 448         tp = args->trans;
 449         mp = dp->i_mount;
 450         /*
 451          * Set lowest possible block in the space requested.
 452          */
 453         bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
 454         count = mp->m_dirblkfsbs;
 455         /*
 456          * Find the first hole for our block.
 457          */
 458         if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK)))
 459                 return error;
 460         nmap = 1;
 461         ASSERT(args->firstblock != NULL);
 462         /*
 463          * Try mapping the new block contiguously (one extent).
 464          */
 465         if ((error = xfs_bmapi(tp, dp, bno, count,
 466                         XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
 467                         args->firstblock, args->total, &map, &nmap,
 468                         args->flist, NULL)))
 469                 return error;
 470         ASSERT(nmap <= 1);
 471         if (nmap == 1) {
 472                 mapp = &map;
 473                 mapi = 1;
 474         }
 475         /*
 476          * Didn't work and this is a multiple-fsb directory block.
 477          * Try again with contiguous flag turned on.
 478          */
 479         else if (nmap == 0 && count > 1) {
 480                 xfs_fileoff_t   b;      /* current file offset */
 481
 482                 /*
 483                  * Space for maximum number of mappings.
 484                  */
 485                 mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
 486                 /*
 487                  * Iterate until we get to the end of our block.
 488                  */
 489                 for (b = bno, mapi = 0; b < bno + count; ) {
 490                         int     c;      /* current fsb count */
 491
 492                         /*
 493                          * Can't map more than MAX_NMAP at once.
 494                          */
 495                         nmap = MIN(XFS_BMAP_MAX_NMAP, count);
 496                         c = (int)(bno + count - b);
 497                         if ((error = xfs_bmapi(tp, dp, b, c,
 498                                         XFS_BMAPI_WRITE|XFS_BMAPI_METADATA,
 499                                         args->firstblock, args->total,
 500                                         &mapp[mapi], &nmap, args->flist,
 501                                         NULL))) {
 502                                 kmem_free(mapp, sizeof(*mapp) * count);
 503                                 return error;
 504                         }
 505                         if (nmap < 1)
 506                                 break;
 507                         /*
 508                          * Add this bunch into our table, go to the next offset.
 509                          */
 510                         mapi += nmap;
 511                         b = mapp[mapi - 1].br_startoff +
 512                             mapp[mapi - 1].br_blockcount;
 513                 }
 514         }
 515         /*
 516          * Didn't work.
 517          */
 518         else {
 519                 mapi = 0;
 520                 mapp = NULL;
 521         }
 522         /*
 523          * See how many fsb's we got.
 524          */
 525         for (i = 0, got = 0; i < mapi; i++)
 526                 got += mapp[i].br_blockcount;
 527         /*
 528          * Didn't get enough fsb's, or the first/last block's are wrong.
 529          */
 530         if (got != count || mapp[0].br_startoff != bno ||
 531             mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
 532             bno + count) {
 533                 if (mapp != &map)
 534                         kmem_free(mapp, sizeof(*mapp) * count);
 535                 return XFS_ERROR(ENOSPC);
 536         }
 537         /*
 538          * Done with the temporary mapping table.
 539          */
 540         if (mapp != &map)
 541                 kmem_free(mapp, sizeof(*mapp) * count);
 542         *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
 543         /*
 544          * Update file's size if this is the data space and it grew.
 545          */
 546         if (space == XFS_DIR2_DATA_SPACE) {
 547                 xfs_fsize_t     size;           /* directory file (data) size */
 548
 549                 size = XFS_FSB_TO_B(mp, bno + count);
 550                 if (size > dp->i_d.di_size) {
 551                         dp->i_d.di_size = size;
 552                         xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
 553                 }
 554         }
 555         return 0;
 556 }
 557
 558 /*
 559  * See if the directory is a single-block form directory.
 560  */
 561 int
 562 xfs_dir2_isblock(
 563         xfs_trans_t     *tp,
 564         xfs_inode_t     *dp,
 565         int             *vp)            /* out: 1 is block, 0 is not block */
 566 {
 567         xfs_fileoff_t   last;           /* last file offset */
 568         xfs_mount_t     *mp;
 569         int             rval;
 570
 571         mp = dp->i_mount;
 572         if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
 573                 return rval;
 574         rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
 575         ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
 576         *vp = rval;
 577         return 0;
 578 }
 579
 580 /*
 581  * See if the directory is a single-leaf form directory.
 582  */
 583 int
 584 xfs_dir2_isleaf(
 585         xfs_trans_t     *tp,
 586         xfs_inode_t     *dp,
 587         int             *vp)            /* out: 1 is leaf, 0 is not leaf */
 588 {
 589         xfs_fileoff_t   last;           /* last file offset */
 590         xfs_mount_t     *mp;
 591         int             rval;
 592
 593         mp = dp->i_mount;
 594         if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
 595                 return rval;
 596         *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
 597         return 0;
 598 }
 599
 600 /*
 601  * Remove the given block from the directory.
 602  * This routine is used for data and free blocks, leaf/node are done
 603  * by xfs_da_shrink_inode.
 604  */
 605 int
 606 xfs_dir2_shrink_inode(
 607         xfs_da_args_t   *args,
 608         xfs_dir2_db_t   db,
 609         xfs_dabuf_t     *bp)
 610 {
 611         xfs_fileoff_t   bno;            /* directory file offset */
 612         xfs_dablk_t     da;             /* directory file offset */
 613         int             done;           /* bunmap is finished */
 614         xfs_inode_t     *dp;
 615         int             error;
 616         xfs_mount_t     *mp;
 617         xfs_trans_t     *tp;
 618
 619         xfs_dir2_trace_args_db("shrink_inode", args, db, bp);
 620         dp = args->dp;
 621         mp = dp->i_mount;
 622         tp = args->trans;
 623         da = xfs_dir2_db_to_da(mp, db);
 624         /*
 625          * Unmap the fsblock(s).
 626          */
 627         if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
 628                         XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
 629                         NULL, &done))) {
 630                 /*
 631                  * ENOSPC actually can happen if we're in a removename with
 632                  * no space reservation, and the resulting block removal
 633                  * would cause a bmap btree split or conversion from extents
 634                  * to btree.  This can only happen for un-fragmented
 635                  * directory blocks, since you need to be punching out
 636                  * the middle of an extent.
 637                  * In this case we need to leave the block in the file,
 638                  * and not binval it.
 639                  * So the block has to be in a consistent empty state
 640                  * and appropriately logged.
 641                  * We don't free up the buffer, the caller can tell it
 642                  * hasn't happened since it got an error back.
 643                  */
 644                 return error;
 645         }
 646         ASSERT(done);
 647         /*
 648          * Invalidate the buffer from the transaction.
 649          */
 650         xfs_da_binval(tp, bp);
 651         /*
 652          * If it's not a data block, we're done.
 653          */
 654         if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
 655                 return 0;
 656         /*
 657          * If the block isn't the last one in the directory, we're done.
 658          */
 659         if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
 660                 return 0;
 661         bno = da;
 662         if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
 663                 /*
 664                  * This can't really happen unless there's kernel corruption.
 665                  */
 666                 return error;
 667         }
 668         if (db == mp->m_dirdatablk)
 669                 ASSERT(bno == 0);
 670         else
 671                 ASSERT(bno > 0);
 672         /*
 673          * Set the size to the new last block.
 674          */
 675         dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
 676         xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
 677         return 0;
 678 }