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 static int      xfs_dir2_put_dirent64_direct(xfs_dir2_put_args_t *pa);
  47 static int      xfs_dir2_put_dirent64_uio(xfs_dir2_put_args_t *pa);
  48
  49 void
  50 xfs_dir_mount(
  51         xfs_mount_t     *mp)
  52 {
  53         ASSERT(XFS_SB_VERSION_HASDIRV2(&mp->m_sb));
  54         ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
  55                XFS_MAX_BLOCKSIZE);
  56         mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
  57         mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
  58         mp->m_dirdatablk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_DATA_FIRSTDB(mp));
  59         mp->m_dirleafblk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
  60         mp->m_dirfreeblk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_FREE_FIRSTDB(mp));
  61         mp->m_attr_node_ents =
  62                 (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
  63                 (uint)sizeof(xfs_da_node_entry_t);
  64         mp->m_dir_node_ents =
  65                 (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
  66                 (uint)sizeof(xfs_da_node_entry_t);
  67         mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
  68 }
  69
  70 /*
  71  * Return 1 if directory contains only "." and "..".
  72  */
  73 int
  74 xfs_dir_isempty(
  75         xfs_inode_t     *dp)
  76 {
  77         xfs_dir2_sf_t   *sfp;
  78
  79         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
  80         if (dp->i_d.di_size == 0)       /* might happen during shutdown. */
  81                 return 1;
  82         if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
  83                 return 0;
  84         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
  85         return !sfp->hdr.count;
  86 }
  87
  88 /*
  89  * Validate a given inode number.
  90  */
  91 int
  92 xfs_dir_ino_validate(
  93         xfs_mount_t     *mp,
  94         xfs_ino_t       ino)
  95 {
  96         xfs_agblock_t   agblkno;
  97         xfs_agino_t     agino;
  98         xfs_agnumber_t  agno;
  99         int             ino_ok;
 100         int             ioff;
 101
 102         agno = XFS_INO_TO_AGNO(mp, ino);
 103         agblkno = XFS_INO_TO_AGBNO(mp, ino);
 104         ioff = XFS_INO_TO_OFFSET(mp, ino);
 105         agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
 106         ino_ok =
 107                 agno < mp->m_sb.sb_agcount &&
 108                 agblkno < mp->m_sb.sb_agblocks &&
 109                 agblkno != 0 &&
 110                 ioff < (1 << mp->m_sb.sb_inopblog) &&
 111                 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
 112         if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
 113                         XFS_RANDOM_DIR_INO_VALIDATE))) {
 114                 xfs_fs_cmn_err(CE_WARN, mp, "Invalid inode number 0x%Lx",
 115                                 (unsigned long long) ino);
 116                 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
 117                 return XFS_ERROR(EFSCORRUPTED);
 118         }
 119         return 0;
 120 }
 121
 122 /*
 123  * Initialize a directory with its "." and ".." entries.
 124  */
 125 int
 126 xfs_dir_init(
 127         xfs_trans_t     *tp,
 128         xfs_inode_t     *dp,
 129         xfs_inode_t     *pdp)
 130 {
 131         xfs_da_args_t   args;
 132         int             error;
 133
 134         memset((char *)&args, 0, sizeof(args));
 135         args.dp = dp;
 136         args.trans = tp;
 137         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 138         if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
 139                 return error;
 140         return xfs_dir2_sf_create(&args, pdp->i_ino);
 141 }
 142
 143 /*
 144   Enter a name in a directory.
 145  */
 146 int
 147 xfs_dir_createname(
 148         xfs_trans_t             *tp,
 149         xfs_inode_t             *dp,
 150         char                    *name,
 151         int                     namelen,
 152         xfs_ino_t               inum,           /* new entry inode number */
 153         xfs_fsblock_t           *first,         /* bmap's firstblock */
 154         xfs_bmap_free_t         *flist,         /* bmap's freeblock list */
 155         xfs_extlen_t            total)          /* bmap's total block count */
 156 {
 157         xfs_da_args_t           args;
 158         int                     rval;
 159         int                     v;              /* type-checking value */
 160
 161         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 162         if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
 163                 return rval;
 164         XFS_STATS_INC(xs_dir_create);
 165
 166         args.name = name;
 167         args.namelen = namelen;
 168         args.hashval = xfs_da_hashname(name, namelen);
 169         args.inumber = inum;
 170         args.dp = dp;
 171         args.firstblock = first;
 172         args.flist = flist;
 173         args.total = total;
 174         args.whichfork = XFS_DATA_FORK;
 175         args.trans = tp;
 176         args.justcheck = 0;
 177         args.addname = args.oknoent = 1;
 178
 179         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 180                 rval = xfs_dir2_sf_addname(&args);
 181         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 182                 return rval;
 183         else if (v)
 184                 rval = xfs_dir2_block_addname(&args);
 185         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 186                 return rval;
 187         else if (v)
 188                 rval = xfs_dir2_leaf_addname(&args);
 189         else
 190                 rval = xfs_dir2_node_addname(&args);
 191         return rval;
 192 }
 193
 194 /*
 195  * Lookup a name in a directory, give back the inode number.
 196  */
 197 int
 198 xfs_dir_lookup(
 199         xfs_trans_t     *tp,
 200         xfs_inode_t     *dp,
 201         char            *name,
 202         int             namelen,
 203         xfs_ino_t       *inum)          /* out: inode number */
 204 {
 205         xfs_da_args_t   args;
 206         int             rval;
 207         int             v;              /* type-checking value */
 208
 209         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 210         XFS_STATS_INC(xs_dir_lookup);
 211
 212         args.name = name;
 213         args.namelen = namelen;
 214         args.hashval = xfs_da_hashname(name, namelen);
 215         args.inumber = 0;
 216         args.dp = dp;
 217         args.firstblock = NULL;
 218         args.flist = NULL;
 219         args.total = 0;
 220         args.whichfork = XFS_DATA_FORK;
 221         args.trans = tp;
 222         args.justcheck = args.addname = 0;
 223         args.oknoent = 1;
 224
 225         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 226                 rval = xfs_dir2_sf_lookup(&args);
 227         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 228                 return rval;
 229         else if (v)
 230                 rval = xfs_dir2_block_lookup(&args);
 231         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 232                 return rval;
 233         else if (v)
 234                 rval = xfs_dir2_leaf_lookup(&args);
 235         else
 236                 rval = xfs_dir2_node_lookup(&args);
 237         if (rval == EEXIST)
 238                 rval = 0;
 239         if (rval == 0)
 240                 *inum = args.inumber;
 241         return rval;
 242 }
 243
 244 /*
 245  * Remove an entry from a directory.
 246  */
 247 int
 248 xfs_dir_removename(
 249         xfs_trans_t     *tp,
 250         xfs_inode_t     *dp,
 251         char            *name,
 252         int             namelen,
 253         xfs_ino_t       ino,
 254         xfs_fsblock_t   *first,         /* bmap's firstblock */
 255         xfs_bmap_free_t *flist,         /* bmap's freeblock list */
 256         xfs_extlen_t    total)          /* bmap's total block count */
 257 {
 258         xfs_da_args_t   args;
 259         int             rval;
 260         int             v;              /* type-checking value */
 261
 262         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 263         XFS_STATS_INC(xs_dir_remove);
 264
 265         args.name = name;
 266         args.namelen = namelen;
 267         args.hashval = xfs_da_hashname(name, namelen);
 268         args.inumber = ino;
 269         args.dp = dp;
 270         args.firstblock = first;
 271         args.flist = flist;
 272         args.total = total;
 273         args.whichfork = XFS_DATA_FORK;
 274         args.trans = tp;
 275         args.justcheck = args.addname = args.oknoent = 0;
 276
 277         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 278                 rval = xfs_dir2_sf_removename(&args);
 279         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 280                 return rval;
 281         else if (v)
 282                 rval = xfs_dir2_block_removename(&args);
 283         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 284                 return rval;
 285         else if (v)
 286                 rval = xfs_dir2_leaf_removename(&args);
 287         else
 288                 rval = xfs_dir2_node_removename(&args);
 289         return rval;
 290 }
 291
 292 /*
 293  * Read a directory.
 294  */
 295 int
 296 xfs_dir_getdents(
 297         xfs_trans_t     *tp,
 298         xfs_inode_t     *dp,
 299         uio_t           *uio,           /* caller's buffer control */
 300         int             *eofp)          /* out: eof reached */
 301 {
 302         int             alignment;      /* alignment required for ABI */
 303         xfs_dirent_t    *dbp;           /* malloc'ed buffer */
 304         xfs_dir2_put_t  put;            /* entry formatting routine */
 305         int             rval;           /* return value */
 306         int             v;              /* type-checking value */
 307
 308         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 309         XFS_STATS_INC(xs_dir_getdents);
 310         /*
 311          * If our caller has given us a single contiguous aligned memory buffer,
 312          * just work directly within that buffer.  If it's in user memory,
 313          * lock it down first.
 314          */
 315         alignment = sizeof(xfs_off_t) - 1;
 316         if ((uio->uio_iovcnt == 1) &&
 317             (((__psint_t)uio->uio_iov[0].iov_base & alignment) == 0) &&
 318             ((uio->uio_iov[0].iov_len & alignment) == 0)) {
 319                 dbp = NULL;
 320                 put = xfs_dir2_put_dirent64_direct;
 321         } else {
 322                 dbp = kmem_alloc(sizeof(*dbp) + MAXNAMELEN, KM_SLEEP);
 323                 put = xfs_dir2_put_dirent64_uio;
 324         }
 325
 326         *eofp = 0;
 327         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 328                 rval = xfs_dir2_sf_getdents(dp, uio, eofp, dbp, put);
 329         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 330                 ;
 331         else if (v)
 332                 rval = xfs_dir2_block_getdents(tp, dp, uio, eofp, dbp, put);
 333         else
 334                 rval = xfs_dir2_leaf_getdents(tp, dp, uio, eofp, dbp, put);
 335         if (dbp != NULL)
 336                 kmem_free(dbp, sizeof(*dbp) + MAXNAMELEN);
 337         return rval;
 338 }
 339
 340 /*
 341  * Replace the inode number of a directory entry.
 342  */
 343 int
 344 xfs_dir_replace(
 345         xfs_trans_t     *tp,
 346         xfs_inode_t     *dp,
 347         char            *name,          /* name of entry to replace */
 348         int             namelen,
 349         xfs_ino_t       inum,           /* new inode number */
 350         xfs_fsblock_t   *first,         /* bmap's firstblock */
 351         xfs_bmap_free_t *flist,         /* bmap's freeblock list */
 352         xfs_extlen_t    total)          /* bmap's total block count */
 353 {
 354         xfs_da_args_t   args;
 355         int             rval;
 356         int             v;              /* type-checking value */
 357
 358         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 359
 360         if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
 361                 return rval;
 362
 363         args.name = name;
 364         args.namelen = namelen;
 365         args.hashval = xfs_da_hashname(name, namelen);
 366         args.inumber = inum;
 367         args.dp = dp;
 368         args.firstblock = first;
 369         args.flist = flist;
 370         args.total = total;
 371         args.whichfork = XFS_DATA_FORK;
 372         args.trans = tp;
 373         args.justcheck = args.addname = args.oknoent = 0;
 374
 375         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 376                 rval = xfs_dir2_sf_replace(&args);
 377         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 378                 return rval;
 379         else if (v)
 380                 rval = xfs_dir2_block_replace(&args);
 381         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 382                 return rval;
 383         else if (v)
 384                 rval = xfs_dir2_leaf_replace(&args);
 385         else
 386                 rval = xfs_dir2_node_replace(&args);
 387         return rval;
 388 }
 389
 390 /*
 391  * See if this entry can be added to the directory without allocating space.
 392  */
 393 int
 394 xfs_dir_canenter(
 395         xfs_trans_t     *tp,
 396         xfs_inode_t     *dp,
 397         char            *name,          /* name of entry to add */
 398         int             namelen)
 399 {
 400         xfs_da_args_t   args;
 401         int             rval;
 402         int             v;              /* type-checking value */
 403
 404         ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
 405
 406         args.name = name;
 407         args.namelen = namelen;
 408         args.hashval = xfs_da_hashname(name, namelen);
 409         args.inumber = 0;
 410         args.dp = dp;
 411         args.firstblock = NULL;
 412         args.flist = NULL;
 413         args.total = 0;
 414         args.whichfork = XFS_DATA_FORK;
 415         args.trans = tp;
 416         args.justcheck = args.addname = args.oknoent = 1;
 417
 418         if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 419                 rval = xfs_dir2_sf_addname(&args);
 420         else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 421                 return rval;
 422         else if (v)
 423                 rval = xfs_dir2_block_addname(&args);
 424         else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 425                 return rval;
 426         else if (v)
 427                 rval = xfs_dir2_leaf_addname(&args);
 428         else
 429                 rval = xfs_dir2_node_addname(&args);
 430         return rval;
 431 }
 432
 433 /*
 434  * Utility routines.
 435  */
 436
 437 /*
 438  * Add a block to the directory.
 439  * This routine is for data and free blocks, not leaf/node blocks
 440  * which are handled by xfs_da_grow_inode.
 441  */
 442 int
 443 xfs_dir2_grow_inode(
 444         xfs_da_args_t   *args,
 445         int             space,          /* v2 dir's space XFS_DIR2_xxx_SPACE */
 446         xfs_dir2_db_t   *dbp)           /* out: block number added */
 447 {
 448         xfs_fileoff_t   bno;            /* directory offset of new block */
 449         int             count;          /* count of filesystem blocks */
 450         xfs_inode_t     *dp;            /* incore directory inode */
 451         int             error;
 452         int             got;            /* blocks actually mapped */
 453         int             i;
 454         xfs_bmbt_irec_t map;            /* single structure for bmap */
 455         int             mapi;           /* mapping index */
 456         xfs_bmbt_irec_t *mapp;          /* bmap mapping structure(s) */
 457         xfs_mount_t     *mp;
 458         int             nmap;           /* number of bmap entries */
 459         xfs_trans_t     *tp;
 460
 461         xfs_dir2_trace_args_s("grow_inode", args, space);
 462         dp = args->dp;
 463         tp = args->trans;
 464         mp = dp->i_mount;
 465         /*
 466          * Set lowest possible block in the space requested.
 467          */
 468         bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
 469         count = mp->m_dirblkfsbs;
 470         /*
 471          * Find the first hole for our block.
 472          */
 473         if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK)))
 474                 return error;
 475         nmap = 1;
 476         ASSERT(args->firstblock != NULL);
 477         /*
 478          * Try mapping the new block contiguously (one extent).
 479          */
 480         if ((error = xfs_bmapi(tp, dp, bno, count,
 481                         XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
 482                         args->firstblock, args->total, &map, &nmap,
 483                         args->flist, NULL)))
 484                 return error;
 485         ASSERT(nmap <= 1);
 486         if (nmap == 1) {
 487                 mapp = &map;
 488                 mapi = 1;
 489         }
 490         /*
 491          * Didn't work and this is a multiple-fsb directory block.
 492          * Try again with contiguous flag turned on.
 493          */
 494         else if (nmap == 0 && count > 1) {
 495                 xfs_fileoff_t   b;      /* current file offset */
 496
 497                 /*
 498                  * Space for maximum number of mappings.
 499                  */
 500                 mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
 501                 /*
 502                  * Iterate until we get to the end of our block.
 503                  */
 504                 for (b = bno, mapi = 0; b < bno + count; ) {
 505                         int     c;      /* current fsb count */
 506
 507                         /*
 508                          * Can't map more than MAX_NMAP at once.
 509                          */
 510                         nmap = MIN(XFS_BMAP_MAX_NMAP, count);
 511                         c = (int)(bno + count - b);
 512                         if ((error = xfs_bmapi(tp, dp, b, c,
 513                                         XFS_BMAPI_WRITE|XFS_BMAPI_METADATA,
 514                                         args->firstblock, args->total,
 515                                         &mapp[mapi], &nmap, args->flist,
 516                                         NULL))) {
 517                                 kmem_free(mapp, sizeof(*mapp) * count);
 518                                 return error;
 519                         }
 520                         if (nmap < 1)
 521                                 break;
 522                         /*
 523                          * Add this bunch into our table, go to the next offset.
 524                          */
 525                         mapi += nmap;
 526                         b = mapp[mapi - 1].br_startoff +
 527                             mapp[mapi - 1].br_blockcount;
 528                 }
 529         }
 530         /*
 531          * Didn't work.
 532          */
 533         else {
 534                 mapi = 0;
 535                 mapp = NULL;
 536         }
 537         /*
 538          * See how many fsb's we got.
 539          */
 540         for (i = 0, got = 0; i < mapi; i++)
 541                 got += mapp[i].br_blockcount;
 542         /*
 543          * Didn't get enough fsb's, or the first/last block's are wrong.
 544          */
 545         if (got != count || mapp[0].br_startoff != bno ||
 546             mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
 547             bno + count) {
 548                 if (mapp != &map)
 549                         kmem_free(mapp, sizeof(*mapp) * count);
 550                 return XFS_ERROR(ENOSPC);
 551         }
 552         /*
 553          * Done with the temporary mapping table.
 554          */
 555         if (mapp != &map)
 556                 kmem_free(mapp, sizeof(*mapp) * count);
 557         *dbp = XFS_DIR2_DA_TO_DB(mp, (xfs_dablk_t)bno);
 558         /*
 559          * Update file's size if this is the data space and it grew.
 560          */
 561         if (space == XFS_DIR2_DATA_SPACE) {
 562                 xfs_fsize_t     size;           /* directory file (data) size */
 563
 564                 size = XFS_FSB_TO_B(mp, bno + count);
 565                 if (size > dp->i_d.di_size) {
 566                         dp->i_d.di_size = size;
 567                         xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
 568                 }
 569         }
 570         return 0;
 571 }
 572
 573 /*
 574  * See if the directory is a single-block form directory.
 575  */
 576 int
 577 xfs_dir2_isblock(
 578         xfs_trans_t     *tp,
 579         xfs_inode_t     *dp,
 580         int             *vp)            /* out: 1 is block, 0 is not block */
 581 {
 582         xfs_fileoff_t   last;           /* last file offset */
 583         xfs_mount_t     *mp;
 584         int             rval;
 585
 586         mp = dp->i_mount;
 587         if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
 588                 return rval;
 589         rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
 590         ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
 591         *vp = rval;
 592         return 0;
 593 }
 594
 595 /*
 596  * See if the directory is a single-leaf form directory.
 597  */
 598 int
 599 xfs_dir2_isleaf(
 600         xfs_trans_t     *tp,
 601         xfs_inode_t     *dp,
 602         int             *vp)            /* out: 1 is leaf, 0 is not leaf */
 603 {
 604         xfs_fileoff_t   last;           /* last file offset */
 605         xfs_mount_t     *mp;
 606         int             rval;
 607
 608         mp = dp->i_mount;
 609         if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
 610                 return rval;
 611         *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
 612         return 0;
 613 }
 614
 615 /*
 616  * Getdents put routine for 64-bit ABI, direct form.
 617  */
 618 static int
 619 xfs_dir2_put_dirent64_direct(
 620         xfs_dir2_put_args_t     *pa)
 621 {
 622         xfs_dirent_t            *idbp;          /* dirent pointer */
 623         iovec_t                 *iovp;          /* io vector */
 624         int                     namelen;        /* entry name length */
 625         int                     reclen;         /* entry total length */
 626         uio_t                   *uio;           /* I/O control */
 627
 628         namelen = pa->namelen;
 629         reclen = DIRENTSIZE(namelen);
 630         uio = pa->uio;
 631         /*
 632          * Won't fit in the remaining space.
 633          */
 634         if (reclen > uio->uio_resid) {
 635                 pa->done = 0;
 636                 return 0;
 637         }
 638         iovp = uio->uio_iov;
 639         idbp = (xfs_dirent_t *)iovp->iov_base;
 640         iovp->iov_base = (char *)idbp + reclen;
 641         iovp->iov_len -= reclen;
 642         uio->uio_resid -= reclen;
 643         idbp->d_reclen = reclen;
 644         idbp->d_ino = pa->ino;
 645         idbp->d_off = pa->cook;
 646         idbp->d_name[namelen] = '\0';
 647         pa->done = 1;
 648         memcpy(idbp->d_name, pa->name, namelen);
 649         return 0;
 650 }
 651
 652 /*
 653  * Getdents put routine for 64-bit ABI, uio form.
 654  */
 655 static int
 656 xfs_dir2_put_dirent64_uio(
 657         xfs_dir2_put_args_t     *pa)
 658 {
 659         xfs_dirent_t            *idbp;          /* dirent pointer */
 660         int                     namelen;        /* entry name length */
 661         int                     reclen;         /* entry total length */
 662         int                     rval;           /* return value */
 663         uio_t                   *uio;           /* I/O control */
 664
 665         namelen = pa->namelen;
 666         reclen = DIRENTSIZE(namelen);
 667         uio = pa->uio;
 668         /*
 669          * Won't fit in the remaining space.
 670          */
 671         if (reclen > uio->uio_resid) {
 672                 pa->done = 0;
 673                 return 0;
 674         }
 675         idbp = pa->dbp;
 676         idbp->d_reclen = reclen;
 677         idbp->d_ino = pa->ino;
 678         idbp->d_off = pa->cook;
 679         idbp->d_name[namelen] = '\0';
 680         memcpy(idbp->d_name, pa->name, namelen);
 681         rval = uio_read((caddr_t)idbp, reclen, uio);
 682         pa->done = (rval == 0);
 683         return rval;
 684 }
 685
 686 /*
 687  * Remove the given block from the directory.
 688  * This routine is used for data and free blocks, leaf/node are done
 689  * by xfs_da_shrink_inode.
 690  */
 691 int
 692 xfs_dir2_shrink_inode(
 693         xfs_da_args_t   *args,
 694         xfs_dir2_db_t   db,
 695         xfs_dabuf_t     *bp)
 696 {
 697         xfs_fileoff_t   bno;            /* directory file offset */
 698         xfs_dablk_t     da;             /* directory file offset */
 699         int             done;           /* bunmap is finished */
 700         xfs_inode_t     *dp;
 701         int             error;
 702         xfs_mount_t     *mp;
 703         xfs_trans_t     *tp;
 704
 705         xfs_dir2_trace_args_db("shrink_inode", args, db, bp);
 706         dp = args->dp;
 707         mp = dp->i_mount;
 708         tp = args->trans;
 709         da = XFS_DIR2_DB_TO_DA(mp, db);
 710         /*
 711          * Unmap the fsblock(s).
 712          */
 713         if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
 714                         XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
 715                         NULL, &done))) {
 716                 /*
 717                  * ENOSPC actually can happen if we're in a removename with
 718                  * no space reservation, and the resulting block removal
 719                  * would cause a bmap btree split or conversion from extents
 720                  * to btree.  This can only happen for un-fragmented
 721                  * directory blocks, since you need to be punching out
 722                  * the middle of an extent.
 723                  * In this case we need to leave the block in the file,
 724                  * and not binval it.
 725                  * So the block has to be in a consistent empty state
 726                  * and appropriately logged.
 727                  * We don't free up the buffer, the caller can tell it
 728                  * hasn't happened since it got an error back.
 729                  */
 730                 return error;
 731         }
 732         ASSERT(done);
 733         /*
 734          * Invalidate the buffer from the transaction.
 735          */
 736         xfs_da_binval(tp, bp);
 737         /*
 738          * If it's not a data block, we're done.
 739          */
 740         if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
 741                 return 0;
 742         /*
 743          * If the block isn't the last one in the directory, we're done.
 744          */
 745         if (dp->i_d.di_size > XFS_DIR2_DB_OFF_TO_BYTE(mp, db + 1, 0))
 746                 return 0;
 747         bno = da;
 748         if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
 749                 /*
 750                  * This can't really happen unless there's kernel corruption.
 751                  */
 752                 return error;
 753         }
 754         if (db == mp->m_dirdatablk)
 755                 ASSERT(bno == 0);
 756         else
 757                 ASSERT(bno > 0);
 758         /*
 759          * Set the size to the new last block.
 760          */
 761         dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
 762         xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
 763         return 0;
 764 }