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_error.h"
  44 #include "xfs_vnodeops.h"
  45 #include "xfs_trace.h"
  46
  47 struct xfs_name xfs_name_dotdot = {"..", 2};
  48
  49 /*
  50  * ASCII case-insensitive (ie. A-Z) support for directories that was
  51  * used in IRIX.
  52  */
  53 STATIC xfs_dahash_t
  54 xfs_ascii_ci_hashname(
  55         struct xfs_name *name)
  56 {
  57         xfs_dahash_t    hash;
  58         int             i;
  59
  60         for (i = 0, hash = 0; i < name->len; i++)
  61                 hash = tolower(name->name[i]) ^ rol32(hash, 7);
  62
  63         return hash;
  64 }
  65
  66 STATIC enum xfs_dacmp
  67 xfs_ascii_ci_compname(
  68         struct xfs_da_args *args,
  69         const char      *name,
  70         int             len)
  71 {
  72         enum xfs_dacmp  result;
  73         int             i;
  74
  75         if (args->namelen != len)
  76                 return XFS_CMP_DIFFERENT;
  77
  78         result = XFS_CMP_EXACT;
  79         for (i = 0; i < len; i++) {
  80                 if (args->name[i] == name[i])
  81                         continue;
  82                 if (tolower(args->name[i]) != tolower(name[i]))
  83                         return XFS_CMP_DIFFERENT;
  84                 result = XFS_CMP_CASE;
  85         }
  86
  87         return result;
  88 }
  89
  90 static struct xfs_nameops xfs_ascii_ci_nameops = {
  91         .hashname       = xfs_ascii_ci_hashname,
  92         .compname       = xfs_ascii_ci_compname,
  93 };
  94
  95 void
  96 xfs_dir_mount(
  97         xfs_mount_t     *mp)
  98 {
  99         ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
 100         ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
 101                XFS_MAX_BLOCKSIZE);
 102         mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
 103         mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
 104         mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
 105         mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
 106         mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
 107         mp->m_attr_node_ents =
 108                 (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
 109                 (uint)sizeof(xfs_da_node_entry_t);
 110         mp->m_dir_node_ents =
 111                 (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
 112                 (uint)sizeof(xfs_da_node_entry_t);
 113         mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
 114         if (xfs_sb_version_hasasciici(&mp->m_sb))
 115                 mp->m_dirnameops = &xfs_ascii_ci_nameops;
 116         else
 117                 mp->m_dirnameops = &xfs_default_nameops;
 118 }
 119
 120 /*
 121  * Return 1 if directory contains only "." and "..".
 122  */
 123 int
 124 xfs_dir_isempty(
 125         xfs_inode_t     *dp)
 126 {
 127         xfs_dir2_sf_t   *sfp;
 128
 129         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 130         if (dp->i_d.di_size == 0)       /* might happen during shutdown. */
 131                 return 1;
 132         if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
 133                 return 0;
 134         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
 135         return !sfp->hdr.count;
 136 }
 137
 138 /*
 139  * Validate a given inode number.
 140  */
 141 int
 142 xfs_dir_ino_validate(
 143         xfs_mount_t     *mp,
 144         xfs_ino_t       ino)
 145 {
 146         xfs_agblock_t   agblkno;
 147         xfs_agino_t     agino;
 148         xfs_agnumber_t  agno;
 149         int             ino_ok;
 150         int             ioff;
 151
 152         agno = XFS_INO_TO_AGNO(mp, ino);
 153         agblkno = XFS_INO_TO_AGBNO(mp, ino);
 154         ioff = XFS_INO_TO_OFFSET(mp, ino);
 155         agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
 156         ino_ok =
 157                 agno < mp->m_sb.sb_agcount &&
 158                 agblkno < mp->m_sb.sb_agblocks &&
 159                 agblkno != 0 &&
 160                 ioff < (1 << mp->m_sb.sb_inopblog) &&
 161                 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
 162         if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
 163                         XFS_RANDOM_DIR_INO_VALIDATE))) {
 164                 xfs_fs_cmn_err(CE_WARN, mp, "Invalid inode number 0x%Lx",
 165                                 (unsigned long long) ino);
 166                 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
 167                 return XFS_ERROR(EFSCORRUPTED);
 168         }
 169         return 0;
 170 }
 171
 172 /*
 173  * Initialize a directory with its "." and ".." entries.
 174  */
 175 int
 176 xfs_dir_init(
 177         xfs_trans_t     *tp,
 178         xfs_inode_t     *dp,
 179         xfs_inode_t     *pdp)
 180 {
 181         xfs_da_args_t   args;
 182         int             error;
 183
 184         memset((char *)&args, 0, sizeof(args));
 185         args.dp = dp;
 186         args.trans = tp;
 187         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 188         if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
 189                 return error;
 190         return xfs_dir2_sf_create(&args, pdp->i_ino);
 191 }
 192
 193 /*
 194   Enter a name in a directory.
 195  */
 196 int
 197 xfs_dir_createname(
 198         xfs_trans_t             *tp,
 199         xfs_inode_t             *dp,
 200         struct xfs_name         *name,
 201         xfs_ino_t               inum,           /* new entry inode number */
 202         xfs_fsblock_t           *first,         /* bmap's firstblock */
 203         xfs_bmap_free_t         *flist,         /* bmap's freeblock list */
 204         xfs_extlen_t            total)          /* bmap's total block count */
 205 {
 206         xfs_da_args_t           args;
 207         int                     rval;
 208         int                     v;              /* type-checking value */
 209
 210         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 211         if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
 212                 return rval;
 213         XFS_STATS_INC(xs_dir_create);
 214
 215         memset(&args, 0, sizeof(xfs_da_args_t));
 216         args.name = name->name;
 217         args.namelen = name->len;
 218         args.hashval = dp->i_mount->m_dirnameops->hashname(name);
 219         args.inumber = inum;
 220         args.dp = dp;
 221         args.firstblock = first;
 222         args.flist = flist;
 223         args.total = total;
 224         args.whichfork = XFS_DATA_FORK;
 225         args.trans = tp;
 226         args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
 227
 228         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 229                 rval = xfs_dir2_sf_addname(&args);
 230         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 231                 return rval;
 232         else if (v)
 233                 rval = xfs_dir2_block_addname(&args);
 234         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 235                 return rval;
 236         else if (v)
 237                 rval = xfs_dir2_leaf_addname(&args);
 238         else
 239                 rval = xfs_dir2_node_addname(&args);
 240         return rval;
 241 }
 242
 243 /*
 244  * If doing a CI lookup and case-insensitive match, dup actual name into
 245  * args.value. Return EEXIST for success (ie. name found) or an error.
 246  */
 247 int
 248 xfs_dir_cilookup_result(
 249         struct xfs_da_args *args,
 250         const char      *name,
 251         int             len)
 252 {
 253         if (args->cmpresult == XFS_CMP_DIFFERENT)
 254                 return ENOENT;
 255         if (args->cmpresult != XFS_CMP_CASE ||
 256                                         !(args->op_flags & XFS_DA_OP_CILOOKUP))
 257                 return EEXIST;
 258
 259         args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
 260         if (!args->value)
 261                 return ENOMEM;
 262
 263         memcpy(args->value, name, len);
 264         args->valuelen = len;
 265         return EEXIST;
 266 }
 267
 268 /*
 269  * Lookup a name in a directory, give back the inode number.
 270  * If ci_name is not NULL, returns the actual name in ci_name if it differs
 271  * to name, or ci_name->name is set to NULL for an exact match.
 272  */
 273
 274 int
 275 xfs_dir_lookup(
 276         xfs_trans_t     *tp,
 277         xfs_inode_t     *dp,
 278         struct xfs_name *name,
 279         xfs_ino_t       *inum,          /* out: inode number */
 280         struct xfs_name *ci_name)       /* out: actual name if CI match */
 281 {
 282         xfs_da_args_t   args;
 283         int             rval;
 284         int             v;              /* type-checking value */
 285
 286         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 287         XFS_STATS_INC(xs_dir_lookup);
 288
 289         memset(&args, 0, sizeof(xfs_da_args_t));
 290         args.name = name->name;
 291         args.namelen = name->len;
 292         args.hashval = dp->i_mount->m_dirnameops->hashname(name);
 293         args.dp = dp;
 294         args.whichfork = XFS_DATA_FORK;
 295         args.trans = tp;
 296         args.op_flags = XFS_DA_OP_OKNOENT;
 297         if (ci_name)
 298                 args.op_flags |= XFS_DA_OP_CILOOKUP;
 299
 300         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 301                 rval = xfs_dir2_sf_lookup(&args);
 302         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 303                 return rval;
 304         else if (v)
 305                 rval = xfs_dir2_block_lookup(&args);
 306         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 307                 return rval;
 308         else if (v)
 309                 rval = xfs_dir2_leaf_lookup(&args);
 310         else
 311                 rval = xfs_dir2_node_lookup(&args);
 312         if (rval == EEXIST)
 313                 rval = 0;
 314         if (!rval) {
 315                 *inum = args.inumber;
 316                 if (ci_name) {
 317                         ci_name->name = args.value;
 318                         ci_name->len = args.valuelen;
 319                 }
 320         }
 321         return rval;
 322 }
 323
 324 /*
 325  * Remove an entry from a directory.
 326  */
 327 int
 328 xfs_dir_removename(
 329         xfs_trans_t     *tp,
 330         xfs_inode_t     *dp,
 331         struct xfs_name *name,
 332         xfs_ino_t       ino,
 333         xfs_fsblock_t   *first,         /* bmap's firstblock */
 334         xfs_bmap_free_t *flist,         /* bmap's freeblock list */
 335         xfs_extlen_t    total)          /* bmap's total block count */
 336 {
 337         xfs_da_args_t   args;
 338         int             rval;
 339         int             v;              /* type-checking value */
 340
 341         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 342         XFS_STATS_INC(xs_dir_remove);
 343
 344         memset(&args, 0, sizeof(xfs_da_args_t));
 345         args.name = name->name;
 346         args.namelen = name->len;
 347         args.hashval = dp->i_mount->m_dirnameops->hashname(name);
 348         args.inumber = ino;
 349         args.dp = dp;
 350         args.firstblock = first;
 351         args.flist = flist;
 352         args.total = total;
 353         args.whichfork = XFS_DATA_FORK;
 354         args.trans = tp;
 355
 356         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 357                 rval = xfs_dir2_sf_removename(&args);
 358         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 359                 return rval;
 360         else if (v)
 361                 rval = xfs_dir2_block_removename(&args);
 362         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 363                 return rval;
 364         else if (v)
 365                 rval = xfs_dir2_leaf_removename(&args);
 366         else
 367                 rval = xfs_dir2_node_removename(&args);
 368         return rval;
 369 }
 370
 371 /*
 372  * Read a directory.
 373  */
 374 int
 375 xfs_readdir(
 376         xfs_inode_t     *dp,
 377         void            *dirent,
 378         size_t          bufsize,
 379         xfs_off_t       *offset,
 380         filldir_t       filldir)
 381 {
 382         int             rval;           /* return value */
 383         int             v;              /* type-checking value */
 384
 385         xfs_itrace_entry(dp);
 386
 387         if (XFS_FORCED_SHUTDOWN(dp->i_mount))
 388                 return XFS_ERROR(EIO);
 389
 390         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 391         XFS_STATS_INC(xs_dir_getdents);
 392
 393         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 394                 rval = xfs_dir2_sf_getdents(dp, dirent, offset, filldir);
 395         else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
 396                 ;
 397         else if (v)
 398                 rval = xfs_dir2_block_getdents(dp, dirent, offset, filldir);
 399         else
 400                 rval = xfs_dir2_leaf_getdents(dp, dirent, bufsize, offset,
 401                                               filldir);
 402         return rval;
 403 }
 404
 405 /*
 406  * Replace the inode number of a directory entry.
 407  */
 408 int
 409 xfs_dir_replace(
 410         xfs_trans_t     *tp,
 411         xfs_inode_t     *dp,
 412         struct xfs_name *name,          /* name of entry to replace */
 413         xfs_ino_t       inum,           /* new inode number */
 414         xfs_fsblock_t   *first,         /* bmap's firstblock */
 415         xfs_bmap_free_t *flist,         /* bmap's freeblock list */
 416         xfs_extlen_t    total)          /* bmap's total block count */
 417 {
 418         xfs_da_args_t   args;
 419         int             rval;
 420         int             v;              /* type-checking value */
 421
 422         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 423
 424         if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
 425                 return rval;
 426
 427         memset(&args, 0, sizeof(xfs_da_args_t));
 428         args.name = name->name;
 429         args.namelen = name->len;
 430         args.hashval = dp->i_mount->m_dirnameops->hashname(name);
 431         args.inumber = inum;
 432         args.dp = dp;
 433         args.firstblock = first;
 434         args.flist = flist;
 435         args.total = total;
 436         args.whichfork = XFS_DATA_FORK;
 437         args.trans = tp;
 438
 439         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 440                 rval = xfs_dir2_sf_replace(&args);
 441         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 442                 return rval;
 443         else if (v)
 444                 rval = xfs_dir2_block_replace(&args);
 445         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 446                 return rval;
 447         else if (v)
 448                 rval = xfs_dir2_leaf_replace(&args);
 449         else
 450                 rval = xfs_dir2_node_replace(&args);
 451         return rval;
 452 }
 453
 454 /*
 455  * See if this entry can be added to the directory without allocating space.
 456  * First checks that the caller couldn't reserve enough space (resblks = 0).
 457  */
 458 int
 459 xfs_dir_canenter(
 460         xfs_trans_t     *tp,
 461         xfs_inode_t     *dp,
 462         struct xfs_name *name,          /* name of entry to add */
 463         uint            resblks)
 464 {
 465         xfs_da_args_t   args;
 466         int             rval;
 467         int             v;              /* type-checking value */
 468
 469         if (resblks)
 470                 return 0;
 471
 472         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 473
 474         memset(&args, 0, sizeof(xfs_da_args_t));
 475         args.name = name->name;
 476         args.namelen = name->len;
 477         args.hashval = dp->i_mount->m_dirnameops->hashname(name);
 478         args.dp = dp;
 479         args.whichfork = XFS_DATA_FORK;
 480         args.trans = tp;
 481         args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
 482                                                         XFS_DA_OP_OKNOENT;
 483
 484         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 485                 rval = xfs_dir2_sf_addname(&args);
 486         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 487                 return rval;
 488         else if (v)
 489                 rval = xfs_dir2_block_addname(&args);
 490         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 491                 return rval;
 492         else if (v)
 493                 rval = xfs_dir2_leaf_addname(&args);
 494         else
 495                 rval = xfs_dir2_node_addname(&args);
 496         return rval;
 497 }
 498
 499 /*
 500  * Utility routines.
 501  */
 502
 503 /*
 504  * Add a block to the directory.
 505  * This routine is for data and free blocks, not leaf/node blocks
 506  * which are handled by xfs_da_grow_inode.
 507  */
 508 int
 509 xfs_dir2_grow_inode(
 510         xfs_da_args_t   *args,
 511         int             space,          /* v2 dir's space XFS_DIR2_xxx_SPACE */
 512         xfs_dir2_db_t   *dbp)           /* out: block number added */
 513 {
 514         xfs_fileoff_t   bno;            /* directory offset of new block */
 515         int             count;          /* count of filesystem blocks */
 516         xfs_inode_t     *dp;            /* incore directory inode */
 517         int             error;
 518         int             got;            /* blocks actually mapped */
 519         int             i;
 520         xfs_bmbt_irec_t map;            /* single structure for bmap */
 521         int             mapi;           /* mapping index */
 522         xfs_bmbt_irec_t *mapp;          /* bmap mapping structure(s) */
 523         xfs_mount_t     *mp;
 524         int             nmap;           /* number of bmap entries */
 525         xfs_trans_t     *tp;
 526         xfs_drfsbno_t   nblks;
 527
 528         trace_xfs_dir2_grow_inode(args, space);
 529
 530         dp = args->dp;
 531         tp = args->trans;
 532         mp = dp->i_mount;
 533         nblks = dp->i_d.di_nblocks;
 534         /*
 535          * Set lowest possible block in the space requested.
 536          */
 537         bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
 538         count = mp->m_dirblkfsbs;
 539         /*
 540          * Find the first hole for our block.
 541          */
 542         if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK)))
 543                 return error;
 544         nmap = 1;
 545         ASSERT(args->firstblock != NULL);
 546         /*
 547          * Try mapping the new block contiguously (one extent).
 548          */
 549         if ((error = xfs_bmapi(tp, dp, bno, count,
 550                         XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
 551                         args->firstblock, args->total, &map, &nmap,
 552                         args->flist, NULL)))
 553                 return error;
 554         ASSERT(nmap <= 1);
 555         if (nmap == 1) {
 556                 mapp = &map;
 557                 mapi = 1;
 558         }
 559         /*
 560          * Didn't work and this is a multiple-fsb directory block.
 561          * Try again with contiguous flag turned on.
 562          */
 563         else if (nmap == 0 && count > 1) {
 564                 xfs_fileoff_t   b;      /* current file offset */
 565
 566                 /*
 567                  * Space for maximum number of mappings.
 568                  */
 569                 mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
 570                 /*
 571                  * Iterate until we get to the end of our block.
 572                  */
 573                 for (b = bno, mapi = 0; b < bno + count; ) {
 574                         int     c;      /* current fsb count */
 575
 576                         /*
 577                          * Can't map more than MAX_NMAP at once.
 578                          */
 579                         nmap = MIN(XFS_BMAP_MAX_NMAP, count);
 580                         c = (int)(bno + count - b);
 581                         if ((error = xfs_bmapi(tp, dp, b, c,
 582                                         XFS_BMAPI_WRITE|XFS_BMAPI_METADATA,
 583                                         args->firstblock, args->total,
 584                                         &mapp[mapi], &nmap, args->flist,
 585                                         NULL))) {
 586                                 kmem_free(mapp);
 587                                 return error;
 588                         }
 589                         if (nmap < 1)
 590                                 break;
 591                         /*
 592                          * Add this bunch into our table, go to the next offset.
 593                          */
 594                         mapi += nmap;
 595                         b = mapp[mapi - 1].br_startoff +
 596                             mapp[mapi - 1].br_blockcount;
 597                 }
 598         }
 599         /*
 600          * Didn't work.
 601          */
 602         else {
 603                 mapi = 0;
 604                 mapp = NULL;
 605         }
 606         /*
 607          * See how many fsb's we got.
 608          */
 609         for (i = 0, got = 0; i < mapi; i++)
 610                 got += mapp[i].br_blockcount;
 611         /*
 612          * Didn't get enough fsb's, or the first/last block's are wrong.
 613          */
 614         if (got != count || mapp[0].br_startoff != bno ||
 615             mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
 616             bno + count) {
 617                 if (mapp != &map)
 618                         kmem_free(mapp);
 619                 return XFS_ERROR(ENOSPC);
 620         }
 621         /*
 622          * Done with the temporary mapping table.
 623          */
 624         if (mapp != &map)
 625                 kmem_free(mapp);
 626
 627         /* account for newly allocated blocks in reserved blocks total */
 628         args->total -= dp->i_d.di_nblocks - nblks;
 629         *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
 630
 631         /*
 632          * Update file's size if this is the data space and it grew.
 633          */
 634         if (space == XFS_DIR2_DATA_SPACE) {
 635                 xfs_fsize_t     size;           /* directory file (data) size */
 636
 637                 size = XFS_FSB_TO_B(mp, bno + count);
 638                 if (size > dp->i_d.di_size) {
 639                         dp->i_d.di_size = size;
 640                         xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
 641                 }
 642         }
 643         return 0;
 644 }
 645
 646 /*
 647  * See if the directory is a single-block form directory.
 648  */
 649 int
 650 xfs_dir2_isblock(
 651         xfs_trans_t     *tp,
 652         xfs_inode_t     *dp,
 653         int             *vp)            /* out: 1 is block, 0 is not block */
 654 {
 655         xfs_fileoff_t   last;           /* last file offset */
 656         xfs_mount_t     *mp;
 657         int             rval;
 658
 659         mp = dp->i_mount;
 660         if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
 661                 return rval;
 662         rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
 663         ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
 664         *vp = rval;
 665         return 0;
 666 }
 667
 668 /*
 669  * See if the directory is a single-leaf form directory.
 670  */
 671 int
 672 xfs_dir2_isleaf(
 673         xfs_trans_t     *tp,
 674         xfs_inode_t     *dp,
 675         int             *vp)            /* out: 1 is leaf, 0 is not leaf */
 676 {
 677         xfs_fileoff_t   last;           /* last file offset */
 678         xfs_mount_t     *mp;
 679         int             rval;
 680
 681         mp = dp->i_mount;
 682         if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
 683                 return rval;
 684         *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
 685         return 0;
 686 }
 687
 688 /*
 689  * Remove the given block from the directory.
 690  * This routine is used for data and free blocks, leaf/node are done
 691  * by xfs_da_shrink_inode.
 692  */
 693 int
 694 xfs_dir2_shrink_inode(
 695         xfs_da_args_t   *args,
 696         xfs_dir2_db_t   db,
 697         xfs_dabuf_t     *bp)
 698 {
 699         xfs_fileoff_t   bno;            /* directory file offset */
 700         xfs_dablk_t     da;             /* directory file offset */
 701         int             done;           /* bunmap is finished */
 702         xfs_inode_t     *dp;
 703         int             error;
 704         xfs_mount_t     *mp;
 705         xfs_trans_t     *tp;
 706
 707         trace_xfs_dir2_shrink_inode(args, db);
 708
 709         dp = args->dp;
 710         mp = dp->i_mount;
 711         tp = args->trans;
 712         da = xfs_dir2_db_to_da(mp, db);
 713         /*
 714          * Unmap the fsblock(s).
 715          */
 716         if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
 717                         XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
 718                         NULL, &done))) {
 719                 /*
 720                  * ENOSPC actually can happen if we're in a removename with
 721                  * no space reservation, and the resulting block removal
 722                  * would cause a bmap btree split or conversion from extents
 723                  * to btree.  This can only happen for un-fragmented
 724                  * directory blocks, since you need to be punching out
 725                  * the middle of an extent.
 726                  * In this case we need to leave the block in the file,
 727                  * and not binval it.
 728                  * So the block has to be in a consistent empty state
 729                  * and appropriately logged.
 730                  * We don't free up the buffer, the caller can tell it
 731                  * hasn't happened since it got an error back.
 732                  */
 733                 return error;
 734         }
 735         ASSERT(done);
 736         /*
 737          * Invalidate the buffer from the transaction.
 738          */
 739         xfs_da_binval(tp, bp);
 740         /*
 741          * If it's not a data block, we're done.
 742          */
 743         if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
 744                 return 0;
 745         /*
 746          * If the block isn't the last one in the directory, we're done.
 747          */
 748         if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
 749                 return 0;
 750         bno = da;
 751         if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
 752                 /*
 753                  * This can't really happen unless there's kernel corruption.
 754                  */
 755                 return error;
 756         }
 757         if (db == mp->m_dirdatablk)
 758                 ASSERT(bno == 0);
 759         else
 760                 ASSERT(bno > 0);
 761         /*
 762          * Set the size to the new last block.
 763          */
 764         dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
 765         xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
 766         return 0;
 767 }