linux/fs/xfs/xfs_dir2.c
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   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_log.h"
  22#include "xfs_inum.h"
  23#include "xfs_trans.h"
  24#include "xfs_sb.h"
  25#include "xfs_ag.h"
  26#include "xfs_mount.h"
  27#include "xfs_da_btree.h"
  28#include "xfs_bmap_btree.h"
  29#include "xfs_alloc_btree.h"
  30#include "xfs_dinode.h"
  31#include "xfs_inode.h"
  32#include "xfs_inode_item.h"
  33#include "xfs_bmap.h"
  34#include "xfs_dir2.h"
  35#include "xfs_dir2_format.h"
  36#include "xfs_dir2_priv.h"
  37#include "xfs_error.h"
  38#include "xfs_vnodeops.h"
  39#include "xfs_trace.h"
  40
  41struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2};
  42
  43/*
  44 * ASCII case-insensitive (ie. A-Z) support for directories that was
  45 * used in IRIX.
  46 */
  47STATIC xfs_dahash_t
  48xfs_ascii_ci_hashname(
  49        struct xfs_name *name)
  50{
  51        xfs_dahash_t    hash;
  52        int             i;
  53
  54        for (i = 0, hash = 0; i < name->len; i++)
  55                hash = tolower(name->name[i]) ^ rol32(hash, 7);
  56
  57        return hash;
  58}
  59
  60STATIC enum xfs_dacmp
  61xfs_ascii_ci_compname(
  62        struct xfs_da_args *args,
  63        const unsigned char *name,
  64        int             len)
  65{
  66        enum xfs_dacmp  result;
  67        int             i;
  68
  69        if (args->namelen != len)
  70                return XFS_CMP_DIFFERENT;
  71
  72        result = XFS_CMP_EXACT;
  73        for (i = 0; i < len; i++) {
  74                if (args->name[i] == name[i])
  75                        continue;
  76                if (tolower(args->name[i]) != tolower(name[i]))
  77                        return XFS_CMP_DIFFERENT;
  78                result = XFS_CMP_CASE;
  79        }
  80
  81        return result;
  82}
  83
  84static struct xfs_nameops xfs_ascii_ci_nameops = {
  85        .hashname       = xfs_ascii_ci_hashname,
  86        .compname       = xfs_ascii_ci_compname,
  87};
  88
  89void
  90xfs_dir_mount(
  91        xfs_mount_t     *mp)
  92{
  93        ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
  94        ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
  95               XFS_MAX_BLOCKSIZE);
  96        mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
  97        mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
  98        mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
  99        mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
 100        mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
 101        mp->m_attr_node_ents =
 102                (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
 103                (uint)sizeof(xfs_da_node_entry_t);
 104        mp->m_dir_node_ents =
 105                (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
 106                (uint)sizeof(xfs_da_node_entry_t);
 107        mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
 108        if (xfs_sb_version_hasasciici(&mp->m_sb))
 109                mp->m_dirnameops = &xfs_ascii_ci_nameops;
 110        else
 111                mp->m_dirnameops = &xfs_default_nameops;
 112}
 113
 114/*
 115 * Return 1 if directory contains only "." and "..".
 116 */
 117int
 118xfs_dir_isempty(
 119        xfs_inode_t     *dp)
 120{
 121        xfs_dir2_sf_hdr_t       *sfp;
 122
 123        ASSERT(S_ISDIR(dp->i_d.di_mode));
 124        if (dp->i_d.di_size == 0)       /* might happen during shutdown. */
 125                return 1;
 126        if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
 127                return 0;
 128        sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
 129        return !sfp->count;
 130}
 131
 132/*
 133 * Validate a given inode number.
 134 */
 135int
 136xfs_dir_ino_validate(
 137        xfs_mount_t     *mp,
 138        xfs_ino_t       ino)
 139{
 140        xfs_agblock_t   agblkno;
 141        xfs_agino_t     agino;
 142        xfs_agnumber_t  agno;
 143        int             ino_ok;
 144        int             ioff;
 145
 146        agno = XFS_INO_TO_AGNO(mp, ino);
 147        agblkno = XFS_INO_TO_AGBNO(mp, ino);
 148        ioff = XFS_INO_TO_OFFSET(mp, ino);
 149        agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
 150        ino_ok =
 151                agno < mp->m_sb.sb_agcount &&
 152                agblkno < mp->m_sb.sb_agblocks &&
 153                agblkno != 0 &&
 154                ioff < (1 << mp->m_sb.sb_inopblog) &&
 155                XFS_AGINO_TO_INO(mp, agno, agino) == ino;
 156        if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
 157                        XFS_RANDOM_DIR_INO_VALIDATE))) {
 158                xfs_warn(mp, "Invalid inode number 0x%Lx",
 159                                (unsigned long long) ino);
 160                XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
 161                return XFS_ERROR(EFSCORRUPTED);
 162        }
 163        return 0;
 164}
 165
 166/*
 167 * Initialize a directory with its "." and ".." entries.
 168 */
 169int
 170xfs_dir_init(
 171        xfs_trans_t     *tp,
 172        xfs_inode_t     *dp,
 173        xfs_inode_t     *pdp)
 174{
 175        xfs_da_args_t   args;
 176        int             error;
 177
 178        memset((char *)&args, 0, sizeof(args));
 179        args.dp = dp;
 180        args.trans = tp;
 181        ASSERT(S_ISDIR(dp->i_d.di_mode));
 182        if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
 183                return error;
 184        return xfs_dir2_sf_create(&args, pdp->i_ino);
 185}
 186
 187/*
 188  Enter a name in a directory.
 189 */
 190int
 191xfs_dir_createname(
 192        xfs_trans_t             *tp,
 193        xfs_inode_t             *dp,
 194        struct xfs_name         *name,
 195        xfs_ino_t               inum,           /* new entry inode number */
 196        xfs_fsblock_t           *first,         /* bmap's firstblock */
 197        xfs_bmap_free_t         *flist,         /* bmap's freeblock list */
 198        xfs_extlen_t            total)          /* bmap's total block count */
 199{
 200        xfs_da_args_t           args;
 201        int                     rval;
 202        int                     v;              /* type-checking value */
 203
 204        ASSERT(S_ISDIR(dp->i_d.di_mode));
 205        if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
 206                return rval;
 207        XFS_STATS_INC(xs_dir_create);
 208
 209        memset(&args, 0, sizeof(xfs_da_args_t));
 210        args.name = name->name;
 211        args.namelen = name->len;
 212        args.hashval = dp->i_mount->m_dirnameops->hashname(name);
 213        args.inumber = inum;
 214        args.dp = dp;
 215        args.firstblock = first;
 216        args.flist = flist;
 217        args.total = total;
 218        args.whichfork = XFS_DATA_FORK;
 219        args.trans = tp;
 220        args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
 221
 222        if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 223                rval = xfs_dir2_sf_addname(&args);
 224        else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 225                return rval;
 226        else if (v)
 227                rval = xfs_dir2_block_addname(&args);
 228        else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 229                return rval;
 230        else if (v)
 231                rval = xfs_dir2_leaf_addname(&args);
 232        else
 233                rval = xfs_dir2_node_addname(&args);
 234        return rval;
 235}
 236
 237/*
 238 * If doing a CI lookup and case-insensitive match, dup actual name into
 239 * args.value. Return EEXIST for success (ie. name found) or an error.
 240 */
 241int
 242xfs_dir_cilookup_result(
 243        struct xfs_da_args *args,
 244        const unsigned char *name,
 245        int             len)
 246{
 247        if (args->cmpresult == XFS_CMP_DIFFERENT)
 248                return ENOENT;
 249        if (args->cmpresult != XFS_CMP_CASE ||
 250                                        !(args->op_flags & XFS_DA_OP_CILOOKUP))
 251                return EEXIST;
 252
 253        args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
 254        if (!args->value)
 255                return ENOMEM;
 256
 257        memcpy(args->value, name, len);
 258        args->valuelen = len;
 259        return EEXIST;
 260}
 261
 262/*
 263 * Lookup a name in a directory, give back the inode number.
 264 * If ci_name is not NULL, returns the actual name in ci_name if it differs
 265 * to name, or ci_name->name is set to NULL for an exact match.
 266 */
 267
 268int
 269xfs_dir_lookup(
 270        xfs_trans_t     *tp,
 271        xfs_inode_t     *dp,
 272        struct xfs_name *name,
 273        xfs_ino_t       *inum,          /* out: inode number */
 274        struct xfs_name *ci_name)       /* out: actual name if CI match */
 275{
 276        xfs_da_args_t   args;
 277        int             rval;
 278        int             v;              /* type-checking value */
 279
 280        ASSERT(S_ISDIR(dp->i_d.di_mode));
 281        XFS_STATS_INC(xs_dir_lookup);
 282
 283        memset(&args, 0, sizeof(xfs_da_args_t));
 284        args.name = name->name;
 285        args.namelen = name->len;
 286        args.hashval = dp->i_mount->m_dirnameops->hashname(name);
 287        args.dp = dp;
 288        args.whichfork = XFS_DATA_FORK;
 289        args.trans = tp;
 290        args.op_flags = XFS_DA_OP_OKNOENT;
 291        if (ci_name)
 292                args.op_flags |= XFS_DA_OP_CILOOKUP;
 293
 294        if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 295                rval = xfs_dir2_sf_lookup(&args);
 296        else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 297                return rval;
 298        else if (v)
 299                rval = xfs_dir2_block_lookup(&args);
 300        else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 301                return rval;
 302        else if (v)
 303                rval = xfs_dir2_leaf_lookup(&args);
 304        else
 305                rval = xfs_dir2_node_lookup(&args);
 306        if (rval == EEXIST)
 307                rval = 0;
 308        if (!rval) {
 309                *inum = args.inumber;
 310                if (ci_name) {
 311                        ci_name->name = args.value;
 312                        ci_name->len = args.valuelen;
 313                }
 314        }
 315        return rval;
 316}
 317
 318/*
 319 * Remove an entry from a directory.
 320 */
 321int
 322xfs_dir_removename(
 323        xfs_trans_t     *tp,
 324        xfs_inode_t     *dp,
 325        struct xfs_name *name,
 326        xfs_ino_t       ino,
 327        xfs_fsblock_t   *first,         /* bmap's firstblock */
 328        xfs_bmap_free_t *flist,         /* bmap's freeblock list */
 329        xfs_extlen_t    total)          /* bmap's total block count */
 330{
 331        xfs_da_args_t   args;
 332        int             rval;
 333        int             v;              /* type-checking value */
 334
 335        ASSERT(S_ISDIR(dp->i_d.di_mode));
 336        XFS_STATS_INC(xs_dir_remove);
 337
 338        memset(&args, 0, sizeof(xfs_da_args_t));
 339        args.name = name->name;
 340        args.namelen = name->len;
 341        args.hashval = dp->i_mount->m_dirnameops->hashname(name);
 342        args.inumber = ino;
 343        args.dp = dp;
 344        args.firstblock = first;
 345        args.flist = flist;
 346        args.total = total;
 347        args.whichfork = XFS_DATA_FORK;
 348        args.trans = tp;
 349
 350        if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 351                rval = xfs_dir2_sf_removename(&args);
 352        else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 353                return rval;
 354        else if (v)
 355                rval = xfs_dir2_block_removename(&args);
 356        else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 357                return rval;
 358        else if (v)
 359                rval = xfs_dir2_leaf_removename(&args);
 360        else
 361                rval = xfs_dir2_node_removename(&args);
 362        return rval;
 363}
 364
 365/*
 366 * Read a directory.
 367 */
 368int
 369xfs_readdir(
 370        xfs_inode_t     *dp,
 371        void            *dirent,
 372        size_t          bufsize,
 373        xfs_off_t       *offset,
 374        filldir_t       filldir)
 375{
 376        int             rval;           /* return value */
 377        int             v;              /* type-checking value */
 378
 379        trace_xfs_readdir(dp);
 380
 381        if (XFS_FORCED_SHUTDOWN(dp->i_mount))
 382                return XFS_ERROR(EIO);
 383
 384        ASSERT(S_ISDIR(dp->i_d.di_mode));
 385        XFS_STATS_INC(xs_dir_getdents);
 386
 387        if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 388                rval = xfs_dir2_sf_getdents(dp, dirent, offset, filldir);
 389        else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
 390                ;
 391        else if (v)
 392                rval = xfs_dir2_block_getdents(dp, dirent, offset, filldir);
 393        else
 394                rval = xfs_dir2_leaf_getdents(dp, dirent, bufsize, offset,
 395                                              filldir);
 396        return rval;
 397}
 398
 399/*
 400 * Replace the inode number of a directory entry.
 401 */
 402int
 403xfs_dir_replace(
 404        xfs_trans_t     *tp,
 405        xfs_inode_t     *dp,
 406        struct xfs_name *name,          /* name of entry to replace */
 407        xfs_ino_t       inum,           /* new inode number */
 408        xfs_fsblock_t   *first,         /* bmap's firstblock */
 409        xfs_bmap_free_t *flist,         /* bmap's freeblock list */
 410        xfs_extlen_t    total)          /* bmap's total block count */
 411{
 412        xfs_da_args_t   args;
 413        int             rval;
 414        int             v;              /* type-checking value */
 415
 416        ASSERT(S_ISDIR(dp->i_d.di_mode));
 417
 418        if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
 419                return rval;
 420
 421        memset(&args, 0, sizeof(xfs_da_args_t));
 422        args.name = name->name;
 423        args.namelen = name->len;
 424        args.hashval = dp->i_mount->m_dirnameops->hashname(name);
 425        args.inumber = inum;
 426        args.dp = dp;
 427        args.firstblock = first;
 428        args.flist = flist;
 429        args.total = total;
 430        args.whichfork = XFS_DATA_FORK;
 431        args.trans = tp;
 432
 433        if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 434                rval = xfs_dir2_sf_replace(&args);
 435        else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 436                return rval;
 437        else if (v)
 438                rval = xfs_dir2_block_replace(&args);
 439        else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 440                return rval;
 441        else if (v)
 442                rval = xfs_dir2_leaf_replace(&args);
 443        else
 444                rval = xfs_dir2_node_replace(&args);
 445        return rval;
 446}
 447
 448/*
 449 * See if this entry can be added to the directory without allocating space.
 450 * First checks that the caller couldn't reserve enough space (resblks = 0).
 451 */
 452int
 453xfs_dir_canenter(
 454        xfs_trans_t     *tp,
 455        xfs_inode_t     *dp,
 456        struct xfs_name *name,          /* name of entry to add */
 457        uint            resblks)
 458{
 459        xfs_da_args_t   args;
 460        int             rval;
 461        int             v;              /* type-checking value */
 462
 463        if (resblks)
 464                return 0;
 465
 466        ASSERT(S_ISDIR(dp->i_d.di_mode));
 467
 468        memset(&args, 0, sizeof(xfs_da_args_t));
 469        args.name = name->name;
 470        args.namelen = name->len;
 471        args.hashval = dp->i_mount->m_dirnameops->hashname(name);
 472        args.dp = dp;
 473        args.whichfork = XFS_DATA_FORK;
 474        args.trans = tp;
 475        args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
 476                                                        XFS_DA_OP_OKNOENT;
 477
 478        if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
 479                rval = xfs_dir2_sf_addname(&args);
 480        else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
 481                return rval;
 482        else if (v)
 483                rval = xfs_dir2_block_addname(&args);
 484        else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
 485                return rval;
 486        else if (v)
 487                rval = xfs_dir2_leaf_addname(&args);
 488        else
 489                rval = xfs_dir2_node_addname(&args);
 490        return rval;
 491}
 492
 493/*
 494 * Utility routines.
 495 */
 496
 497/*
 498 * Add a block to the directory.
 499 *
 500 * This routine is for data and free blocks, not leaf/node blocks which are
 501 * handled by xfs_da_grow_inode.
 502 */
 503int
 504xfs_dir2_grow_inode(
 505        struct xfs_da_args      *args,
 506        int                     space,  /* v2 dir's space XFS_DIR2_xxx_SPACE */
 507        xfs_dir2_db_t           *dbp)   /* out: block number added */
 508{
 509        struct xfs_inode        *dp = args->dp;
 510        struct xfs_mount        *mp = dp->i_mount;
 511        xfs_fileoff_t           bno;    /* directory offset of new block */
 512        int                     count;  /* count of filesystem blocks */
 513        int                     error;
 514
 515        trace_xfs_dir2_grow_inode(args, space);
 516
 517        /*
 518         * Set lowest possible block in the space requested.
 519         */
 520        bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
 521        count = mp->m_dirblkfsbs;
 522
 523        error = xfs_da_grow_inode_int(args, &bno, count);
 524        if (error)
 525                return error;
 526
 527        *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
 528
 529        /*
 530         * Update file's size if this is the data space and it grew.
 531         */
 532        if (space == XFS_DIR2_DATA_SPACE) {
 533                xfs_fsize_t     size;           /* directory file (data) size */
 534
 535                size = XFS_FSB_TO_B(mp, bno + count);
 536                if (size > dp->i_d.di_size) {
 537                        dp->i_d.di_size = size;
 538                        xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
 539                }
 540        }
 541        return 0;
 542}
 543
 544/*
 545 * See if the directory is a single-block form directory.
 546 */
 547int
 548xfs_dir2_isblock(
 549        xfs_trans_t     *tp,
 550        xfs_inode_t     *dp,
 551        int             *vp)            /* out: 1 is block, 0 is not block */
 552{
 553        xfs_fileoff_t   last;           /* last file offset */
 554        xfs_mount_t     *mp;
 555        int             rval;
 556
 557        mp = dp->i_mount;
 558        if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
 559                return rval;
 560        rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
 561        ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
 562        *vp = rval;
 563        return 0;
 564}
 565
 566/*
 567 * See if the directory is a single-leaf form directory.
 568 */
 569int
 570xfs_dir2_isleaf(
 571        xfs_trans_t     *tp,
 572        xfs_inode_t     *dp,
 573        int             *vp)            /* out: 1 is leaf, 0 is not leaf */
 574{
 575        xfs_fileoff_t   last;           /* last file offset */
 576        xfs_mount_t     *mp;
 577        int             rval;
 578
 579        mp = dp->i_mount;
 580        if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
 581                return rval;
 582        *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
 583        return 0;
 584}
 585
 586/*
 587 * Remove the given block from the directory.
 588 * This routine is used for data and free blocks, leaf/node are done
 589 * by xfs_da_shrink_inode.
 590 */
 591int
 592xfs_dir2_shrink_inode(
 593        xfs_da_args_t   *args,
 594        xfs_dir2_db_t   db,
 595        struct xfs_buf  *bp)
 596{
 597        xfs_fileoff_t   bno;            /* directory file offset */
 598        xfs_dablk_t     da;             /* directory file offset */
 599        int             done;           /* bunmap is finished */
 600        xfs_inode_t     *dp;
 601        int             error;
 602        xfs_mount_t     *mp;
 603        xfs_trans_t     *tp;
 604
 605        trace_xfs_dir2_shrink_inode(args, db);
 606
 607        dp = args->dp;
 608        mp = dp->i_mount;
 609        tp = args->trans;
 610        da = xfs_dir2_db_to_da(mp, db);
 611        /*
 612         * Unmap the fsblock(s).
 613         */
 614        if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
 615                        XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
 616                        &done))) {
 617                /*
 618                 * ENOSPC actually can happen if we're in a removename with
 619                 * no space reservation, and the resulting block removal
 620                 * would cause a bmap btree split or conversion from extents
 621                 * to btree.  This can only happen for un-fragmented
 622                 * directory blocks, since you need to be punching out
 623                 * the middle of an extent.
 624                 * In this case we need to leave the block in the file,
 625                 * and not binval it.
 626                 * So the block has to be in a consistent empty state
 627                 * and appropriately logged.
 628                 * We don't free up the buffer, the caller can tell it
 629                 * hasn't happened since it got an error back.
 630                 */
 631                return error;
 632        }
 633        ASSERT(done);
 634        /*
 635         * Invalidate the buffer from the transaction.
 636         */
 637        xfs_trans_binval(tp, bp);
 638        /*
 639         * If it's not a data block, we're done.
 640         */
 641        if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
 642                return 0;
 643        /*
 644         * If the block isn't the last one in the directory, we're done.
 645         */
 646        if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
 647                return 0;
 648        bno = da;
 649        if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
 650                /*
 651                 * This can't really happen unless there's kernel corruption.
 652                 */
 653                return error;
 654        }
 655        if (db == mp->m_dirdatablk)
 656                ASSERT(bno == 0);
 657        else
 658                ASSERT(bno > 0);
 659        /*
 660         * Set the size to the new last block.
 661         */
 662        dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
 663        xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
 664        return 0;
 665}
 666
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