fs/xfs/xfs_dir2_block.c

   1 /*
   2  * Copyright (c) 2000-2003,2005 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_dir2.h"
  27 #include "xfs_dmapi.h"
  28 #include "xfs_mount.h"
  29 #include "xfs_da_btree.h"
  30 #include "xfs_bmap_btree.h"
  31 #include "xfs_dir2_sf.h"
  32 #include "xfs_attr_sf.h"
  33 #include "xfs_dinode.h"
  34 #include "xfs_inode.h"
  35 #include "xfs_inode_item.h"
  36 #include "xfs_dir2_data.h"
  37 #include "xfs_dir2_leaf.h"
  38 #include "xfs_dir2_block.h"
  39 #include "xfs_dir2_trace.h"
  40 #include "xfs_error.h"
  41
  42 /*
  43  * Local function prototypes.
  44  */
  45 static void xfs_dir2_block_log_leaf(xfs_trans_t *tp, xfs_dabuf_t *bp, int first,
  46                                     int last);
  47 static void xfs_dir2_block_log_tail(xfs_trans_t *tp, xfs_dabuf_t *bp);
  48 static int xfs_dir2_block_lookup_int(xfs_da_args_t *args, xfs_dabuf_t **bpp,
  49                                      int *entno);
  50 static int xfs_dir2_block_sort(const void *a, const void *b);
  51
  52 static xfs_dahash_t xfs_dir_hash_dot, xfs_dir_hash_dotdot;
  53
  54 /*
  55  * One-time startup routine called from xfs_init().
  56  */
  57 void
  58 xfs_dir_startup(void)
  59 {
  60         xfs_dir_hash_dot = xfs_da_hashname(".", 1);
  61         xfs_dir_hash_dotdot = xfs_da_hashname("..", 2);
  62 }
  63
  64 /*
  65  * Add an entry to a block directory.
  66  */
  67 int                                             /* error */
  68 xfs_dir2_block_addname(
  69         xfs_da_args_t           *args)          /* directory op arguments */
  70 {
  71         xfs_dir2_data_free_t    *bf;            /* bestfree table in block */
  72         xfs_dir2_block_t        *block;         /* directory block structure */
  73         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
  74         xfs_dabuf_t             *bp;            /* buffer for block */
  75         xfs_dir2_block_tail_t   *btp;           /* block tail */
  76         int                     compact;        /* need to compact leaf ents */
  77         xfs_dir2_data_entry_t   *dep;           /* block data entry */
  78         xfs_inode_t             *dp;            /* directory inode */
  79         xfs_dir2_data_unused_t  *dup;           /* block unused entry */
  80         int                     error;          /* error return value */
  81         xfs_dir2_data_unused_t  *enddup=NULL;   /* unused at end of data */
  82         xfs_dahash_t            hash;           /* hash value of found entry */
  83         int                     high;           /* high index for binary srch */
  84         int                     highstale;      /* high stale index */
  85         int                     lfloghigh=0;    /* last final leaf to log */
  86         int                     lfloglow=0;     /* first final leaf to log */
  87         int                     len;            /* length of the new entry */
  88         int                     low;            /* low index for binary srch */
  89         int                     lowstale;       /* low stale index */
  90         int                     mid=0;          /* midpoint for binary srch */
  91         xfs_mount_t             *mp;            /* filesystem mount point */
  92         int                     needlog;        /* need to log header */
  93         int                     needscan;       /* need to rescan freespace */
  94         __be16                  *tagp;          /* pointer to tag value */
  95         xfs_trans_t             *tp;            /* transaction structure */
  96
  97         xfs_dir2_trace_args("block_addname", args);
  98         dp = args->dp;
  99         tp = args->trans;
 100         mp = dp->i_mount;
 101         /*
 102          * Read the (one and only) directory block into dabuf bp.
 103          */
 104         if ((error =
 105             xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
 106                 return error;
 107         }
 108         ASSERT(bp != NULL);
 109         block = bp->data;
 110         /*
 111          * Check the magic number, corrupted if wrong.
 112          */
 113         if (unlikely(be32_to_cpu(block->hdr.magic) != XFS_DIR2_BLOCK_MAGIC)) {
 114                 XFS_CORRUPTION_ERROR("xfs_dir2_block_addname",
 115                                      XFS_ERRLEVEL_LOW, mp, block);
 116                 xfs_da_brelse(tp, bp);
 117                 return XFS_ERROR(EFSCORRUPTED);
 118         }
 119         len = xfs_dir2_data_entsize(args->namelen);
 120         /*
 121          * Set up pointers to parts of the block.
 122          */
 123         bf = block->hdr.bestfree;
 124         btp = xfs_dir2_block_tail_p(mp, block);
 125         blp = xfs_dir2_block_leaf_p(btp);
 126         /*
 127          * No stale entries?  Need space for entry and new leaf.
 128          */
 129         if (!btp->stale) {
 130                 /*
 131                  * Tag just before the first leaf entry.
 132                  */
 133                 tagp = (__be16 *)blp - 1;
 134                 /*
 135                  * Data object just before the first leaf entry.
 136                  */
 137                 enddup = (xfs_dir2_data_unused_t *)((char *)block + be16_to_cpu(*tagp));
 138                 /*
 139                  * If it's not free then can't do this add without cleaning up:
 140                  * the space before the first leaf entry needs to be free so it
 141                  * can be expanded to hold the pointer to the new entry.
 142                  */
 143                 if (be16_to_cpu(enddup->freetag) != XFS_DIR2_DATA_FREE_TAG)
 144                         dup = enddup = NULL;
 145                 /*
 146                  * Check out the biggest freespace and see if it's the same one.
 147                  */
 148                 else {
 149                         dup = (xfs_dir2_data_unused_t *)
 150                               ((char *)block + be16_to_cpu(bf[0].offset));
 151                         if (dup == enddup) {
 152                                 /*
 153                                  * It is the biggest freespace, is it too small
 154                                  * to hold the new leaf too?
 155                                  */
 156                                 if (be16_to_cpu(dup->length) < len + (uint)sizeof(*blp)) {
 157                                         /*
 158                                          * Yes, we use the second-largest
 159                                          * entry instead if it works.
 160                                          */
 161                                         if (be16_to_cpu(bf[1].length) >= len)
 162                                                 dup = (xfs_dir2_data_unused_t *)
 163                                                       ((char *)block +
 164                                                        be16_to_cpu(bf[1].offset));
 165                                         else
 166                                                 dup = NULL;
 167                                 }
 168                         } else {
 169                                 /*
 170                                  * Not the same free entry,
 171                                  * just check its length.
 172                                  */
 173                                 if (be16_to_cpu(dup->length) < len) {
 174                                         dup = NULL;
 175                                 }
 176                         }
 177                 }
 178                 compact = 0;
 179         }
 180         /*
 181          * If there are stale entries we'll use one for the leaf.
 182          * Is the biggest entry enough to avoid compaction?
 183          */
 184         else if (be16_to_cpu(bf[0].length) >= len) {
 185                 dup = (xfs_dir2_data_unused_t *)
 186                       ((char *)block + be16_to_cpu(bf[0].offset));
 187                 compact = 0;
 188         }
 189         /*
 190          * Will need to compact to make this work.
 191          */
 192         else {
 193                 /*
 194                  * Tag just before the first leaf entry.
 195                  */
 196                 tagp = (__be16 *)blp - 1;
 197                 /*
 198                  * Data object just before the first leaf entry.
 199                  */
 200                 dup = (xfs_dir2_data_unused_t *)((char *)block + be16_to_cpu(*tagp));
 201                 /*
 202                  * If it's not free then the data will go where the
 203                  * leaf data starts now, if it works at all.
 204                  */
 205                 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
 206                         if (be16_to_cpu(dup->length) + (be32_to_cpu(btp->stale) - 1) *
 207                             (uint)sizeof(*blp) < len)
 208                                 dup = NULL;
 209                 } else if ((be32_to_cpu(btp->stale) - 1) * (uint)sizeof(*blp) < len)
 210                         dup = NULL;
 211                 else
 212                         dup = (xfs_dir2_data_unused_t *)blp;
 213                 compact = 1;
 214         }
 215         /*
 216          * If this isn't a real add, we're done with the buffer.
 217          */
 218         if (args->justcheck)
 219                 xfs_da_brelse(tp, bp);
 220         /*
 221          * If we don't have space for the new entry & leaf ...
 222          */
 223         if (!dup) {
 224                 /*
 225                  * Not trying to actually do anything, or don't have
 226                  * a space reservation: return no-space.
 227                  */
 228                 if (args->justcheck || args->total == 0)
 229                         return XFS_ERROR(ENOSPC);
 230                 /*
 231                  * Convert to the next larger format.
 232                  * Then add the new entry in that format.
 233                  */
 234                 error = xfs_dir2_block_to_leaf(args, bp);
 235                 xfs_da_buf_done(bp);
 236                 if (error)
 237                         return error;
 238                 return xfs_dir2_leaf_addname(args);
 239         }
 240         /*
 241          * Just checking, and it would work, so say so.
 242          */
 243         if (args->justcheck)
 244                 return 0;
 245         needlog = needscan = 0;
 246         /*
 247          * If need to compact the leaf entries, do it now.
 248          * Leave the highest-numbered stale entry stale.
 249          * XXX should be the one closest to mid but mid is not yet computed.
 250          */
 251         if (compact) {
 252                 int     fromidx;                /* source leaf index */
 253                 int     toidx;                  /* target leaf index */
 254
 255                 for (fromidx = toidx = be32_to_cpu(btp->count) - 1,
 256                         highstale = lfloghigh = -1;
 257                      fromidx >= 0;
 258                      fromidx--) {
 259                         if (be32_to_cpu(blp[fromidx].address) == XFS_DIR2_NULL_DATAPTR) {
 260                                 if (highstale == -1)
 261                                         highstale = toidx;
 262                                 else {
 263                                         if (lfloghigh == -1)
 264                                                 lfloghigh = toidx;
 265                                         continue;
 266                                 }
 267                         }
 268                         if (fromidx < toidx)
 269                                 blp[toidx] = blp[fromidx];
 270                         toidx--;
 271                 }
 272                 lfloglow = toidx + 1 - (be32_to_cpu(btp->stale) - 1);
 273                 lfloghigh -= be32_to_cpu(btp->stale) - 1;
 274                 be32_add_cpu(&btp->count, -(be32_to_cpu(btp->stale) - 1));
 275                 xfs_dir2_data_make_free(tp, bp,
 276                         (xfs_dir2_data_aoff_t)((char *)blp - (char *)block),
 277                         (xfs_dir2_data_aoff_t)((be32_to_cpu(btp->stale) - 1) * sizeof(*blp)),
 278                         &needlog, &needscan);
 279                 blp += be32_to_cpu(btp->stale) - 1;
 280                 btp->stale = cpu_to_be32(1);
 281                 /*
 282                  * If we now need to rebuild the bestfree map, do so.
 283                  * This needs to happen before the next call to use_free.
 284                  */
 285                 if (needscan) {
 286                         xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog);
 287                         needscan = 0;
 288                 }
 289         }
 290         /*
 291          * Set leaf logging boundaries to impossible state.
 292          * For the no-stale case they're set explicitly.
 293          */
 294         else if (btp->stale) {
 295                 lfloglow = be32_to_cpu(btp->count);
 296                 lfloghigh = -1;
 297         }
 298         /*
 299          * Find the slot that's first lower than our hash value, -1 if none.
 300          */
 301         for (low = 0, high = be32_to_cpu(btp->count) - 1; low <= high; ) {
 302                 mid = (low + high) >> 1;
 303                 if ((hash = be32_to_cpu(blp[mid].hashval)) == args->hashval)
 304                         break;
 305                 if (hash < args->hashval)
 306                         low = mid + 1;
 307                 else
 308                         high = mid - 1;
 309         }
 310         while (mid >= 0 && be32_to_cpu(blp[mid].hashval) >= args->hashval) {
 311                 mid--;
 312         }
 313         /*
 314          * No stale entries, will use enddup space to hold new leaf.
 315          */
 316         if (!btp->stale) {
 317                 /*
 318                  * Mark the space needed for the new leaf entry, now in use.
 319                  */
 320                 xfs_dir2_data_use_free(tp, bp, enddup,
 321                         (xfs_dir2_data_aoff_t)
 322                         ((char *)enddup - (char *)block + be16_to_cpu(enddup->length) -
 323                          sizeof(*blp)),
 324                         (xfs_dir2_data_aoff_t)sizeof(*blp),
 325                         &needlog, &needscan);
 326                 /*
 327                  * Update the tail (entry count).
 328                  */
 329                 be32_add_cpu(&btp->count, 1);
 330                 /*
 331                  * If we now need to rebuild the bestfree map, do so.
 332                  * This needs to happen before the next call to use_free.
 333                  */
 334                 if (needscan) {
 335                         xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block,
 336                                 &needlog);
 337                         needscan = 0;
 338                 }
 339                 /*
 340                  * Adjust pointer to the first leaf entry, we're about to move
 341                  * the table up one to open up space for the new leaf entry.
 342                  * Then adjust our index to match.
 343                  */
 344                 blp--;
 345                 mid++;
 346                 if (mid)
 347                         memmove(blp, &blp[1], mid * sizeof(*blp));
 348                 lfloglow = 0;
 349                 lfloghigh = mid;
 350         }
 351         /*
 352          * Use a stale leaf for our new entry.
 353          */
 354         else {
 355                 for (lowstale = mid;
 356                      lowstale >= 0 &&
 357                         be32_to_cpu(blp[lowstale].address) != XFS_DIR2_NULL_DATAPTR;
 358                      lowstale--)
 359                         continue;
 360                 for (highstale = mid + 1;
 361                      highstale < be32_to_cpu(btp->count) &&
 362                         be32_to_cpu(blp[highstale].address) != XFS_DIR2_NULL_DATAPTR &&
 363                         (lowstale < 0 || mid - lowstale > highstale - mid);
 364                      highstale++)
 365                         continue;
 366                 /*
 367                  * Move entries toward the low-numbered stale entry.
 368                  */
 369                 if (lowstale >= 0 &&
 370                     (highstale == be32_to_cpu(btp->count) ||
 371                      mid - lowstale <= highstale - mid)) {
 372                         if (mid - lowstale)
 373                                 memmove(&blp[lowstale], &blp[lowstale + 1],
 374                                         (mid - lowstale) * sizeof(*blp));
 375                         lfloglow = MIN(lowstale, lfloglow);
 376                         lfloghigh = MAX(mid, lfloghigh);
 377                 }
 378                 /*
 379                  * Move entries toward the high-numbered stale entry.
 380                  */
 381                 else {
 382                         ASSERT(highstale < be32_to_cpu(btp->count));
 383                         mid++;
 384                         if (highstale - mid)
 385                                 memmove(&blp[mid + 1], &blp[mid],
 386                                         (highstale - mid) * sizeof(*blp));
 387                         lfloglow = MIN(mid, lfloglow);
 388                         lfloghigh = MAX(highstale, lfloghigh);
 389                 }
 390                 be32_add_cpu(&btp->stale, -1);
 391         }
 392         /*
 393          * Point to the new data entry.
 394          */
 395         dep = (xfs_dir2_data_entry_t *)dup;
 396         /*
 397          * Fill in the leaf entry.
 398          */
 399         blp[mid].hashval = cpu_to_be32(args->hashval);
 400         blp[mid].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,
 401                                 (char *)dep - (char *)block));
 402         xfs_dir2_block_log_leaf(tp, bp, lfloglow, lfloghigh);
 403         /*
 404          * Mark space for the data entry used.
 405          */
 406         xfs_dir2_data_use_free(tp, bp, dup,
 407                 (xfs_dir2_data_aoff_t)((char *)dup - (char *)block),
 408                 (xfs_dir2_data_aoff_t)len, &needlog, &needscan);
 409         /*
 410          * Create the new data entry.
 411          */
 412         dep->inumber = cpu_to_be64(args->inumber);
 413         dep->namelen = args->namelen;
 414         memcpy(dep->name, args->name, args->namelen);
 415         tagp = xfs_dir2_data_entry_tag_p(dep);
 416         *tagp = cpu_to_be16((char *)dep - (char *)block);
 417         /*
 418          * Clean up the bestfree array and log the header, tail, and entry.
 419          */
 420         if (needscan)
 421                 xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog);
 422         if (needlog)
 423                 xfs_dir2_data_log_header(tp, bp);
 424         xfs_dir2_block_log_tail(tp, bp);
 425         xfs_dir2_data_log_entry(tp, bp, dep);
 426         xfs_dir2_data_check(dp, bp);
 427         xfs_da_buf_done(bp);
 428         return 0;
 429 }
 430
 431 /*
 432  * Readdir for block directories.
 433  */
 434 int                                             /* error */
 435 xfs_dir2_block_getdents(
 436         xfs_inode_t             *dp,            /* incore inode */
 437         void                    *dirent,
 438         xfs_off_t               *offset,
 439         filldir_t               filldir)
 440 {
 441         xfs_dir2_block_t        *block;         /* directory block structure */
 442         xfs_dabuf_t             *bp;            /* buffer for block */
 443         xfs_dir2_block_tail_t   *btp;           /* block tail */
 444         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 445         xfs_dir2_data_unused_t  *dup;           /* block unused entry */
 446         char                    *endptr;        /* end of the data entries */
 447         int                     error;          /* error return value */
 448         xfs_mount_t             *mp;            /* filesystem mount point */
 449         char                    *ptr;           /* current data entry */
 450         int                     wantoff;        /* starting block offset */
 451         xfs_ino_t               ino;
 452         xfs_off_t               cook;
 453
 454         mp = dp->i_mount;
 455         /*
 456          * If the block number in the offset is out of range, we're done.
 457          */
 458         if (xfs_dir2_dataptr_to_db(mp, *offset) > mp->m_dirdatablk) {
 459                 return 0;
 460         }
 461         /*
 462          * Can't read the block, give up, else get dabuf in bp.
 463          */
 464         error = xfs_da_read_buf(NULL, dp, mp->m_dirdatablk, -1,
 465                                 &bp, XFS_DATA_FORK);
 466         if (error)
 467                 return error;
 468
 469         ASSERT(bp != NULL);
 470         /*
 471          * Extract the byte offset we start at from the seek pointer.
 472          * We'll skip entries before this.
 473          */
 474         wantoff = xfs_dir2_dataptr_to_off(mp, *offset);
 475         block = bp->data;
 476         xfs_dir2_data_check(dp, bp);
 477         /*
 478          * Set up values for the loop.
 479          */
 480         btp = xfs_dir2_block_tail_p(mp, block);
 481         ptr = (char *)block->u;
 482         endptr = (char *)xfs_dir2_block_leaf_p(btp);
 483
 484         /*
 485          * Loop over the data portion of the block.
 486          * Each object is a real entry (dep) or an unused one (dup).
 487          */
 488         while (ptr < endptr) {
 489                 dup = (xfs_dir2_data_unused_t *)ptr;
 490                 /*
 491                  * Unused, skip it.
 492                  */
 493                 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
 494                         ptr += be16_to_cpu(dup->length);
 495                         continue;
 496                 }
 497
 498                 dep = (xfs_dir2_data_entry_t *)ptr;
 499
 500                 /*
 501                  * Bump pointer for the next iteration.
 502                  */
 503                 ptr += xfs_dir2_data_entsize(dep->namelen);
 504                 /*
 505                  * The entry is before the desired starting point, skip it.
 506                  */
 507                 if ((char *)dep - (char *)block < wantoff)
 508                         continue;
 509
 510                 cook = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
 511                                             (char *)dep - (char *)block);
 512                 ino = be64_to_cpu(dep->inumber);
 513 #if XFS_BIG_INUMS
 514                 ino += mp->m_inoadd;
 515 #endif
 516
 517                 /*
 518                  * If it didn't fit, set the final offset to here & return.
 519                  */
 520                 if (filldir(dirent, dep->name, dep->namelen, cook,
 521                             ino, DT_UNKNOWN)) {
 522                         *offset = cook;
 523                         xfs_da_brelse(NULL, bp);
 524                         return 0;
 525                 }
 526         }
 527
 528         /*
 529          * Reached the end of the block.
 530          * Set the offset to a non-existent block 1 and return.
 531          */
 532         *offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk + 1, 0);
 533         xfs_da_brelse(NULL, bp);
 534         return 0;
 535 }
 536
 537 /*
 538  * Log leaf entries from the block.
 539  */
 540 static void
 541 xfs_dir2_block_log_leaf(
 542         xfs_trans_t             *tp,            /* transaction structure */
 543         xfs_dabuf_t             *bp,            /* block buffer */
 544         int                     first,          /* index of first logged leaf */
 545         int                     last)           /* index of last logged leaf */
 546 {
 547         xfs_dir2_block_t        *block;         /* directory block structure */
 548         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 549         xfs_dir2_block_tail_t   *btp;           /* block tail */
 550         xfs_mount_t             *mp;            /* filesystem mount point */
 551
 552         mp = tp->t_mountp;
 553         block = bp->data;
 554         btp = xfs_dir2_block_tail_p(mp, block);
 555         blp = xfs_dir2_block_leaf_p(btp);
 556         xfs_da_log_buf(tp, bp, (uint)((char *)&blp[first] - (char *)block),
 557                 (uint)((char *)&blp[last + 1] - (char *)block - 1));
 558 }
 559
 560 /*
 561  * Log the block tail.
 562  */
 563 static void
 564 xfs_dir2_block_log_tail(
 565         xfs_trans_t             *tp,            /* transaction structure */
 566         xfs_dabuf_t             *bp)            /* block buffer */
 567 {
 568         xfs_dir2_block_t        *block;         /* directory block structure */
 569         xfs_dir2_block_tail_t   *btp;           /* block tail */
 570         xfs_mount_t             *mp;            /* filesystem mount point */
 571
 572         mp = tp->t_mountp;
 573         block = bp->data;
 574         btp = xfs_dir2_block_tail_p(mp, block);
 575         xfs_da_log_buf(tp, bp, (uint)((char *)btp - (char *)block),
 576                 (uint)((char *)(btp + 1) - (char *)block - 1));
 577 }
 578
 579 /*
 580  * Look up an entry in the block.  This is the external routine,
 581  * xfs_dir2_block_lookup_int does the real work.
 582  */
 583 int                                             /* error */
 584 xfs_dir2_block_lookup(
 585         xfs_da_args_t           *args)          /* dir lookup arguments */
 586 {
 587         xfs_dir2_block_t        *block;         /* block structure */
 588         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 589         xfs_dabuf_t             *bp;            /* block buffer */
 590         xfs_dir2_block_tail_t   *btp;           /* block tail */
 591         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 592         xfs_inode_t             *dp;            /* incore inode */
 593         int                     ent;            /* entry index */
 594         int                     error;          /* error return value */
 595         xfs_mount_t             *mp;            /* filesystem mount point */
 596
 597         xfs_dir2_trace_args("block_lookup", args);
 598         /*
 599          * Get the buffer, look up the entry.
 600          * If not found (ENOENT) then return, have no buffer.
 601          */
 602         if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent)))
 603                 return error;
 604         dp = args->dp;
 605         mp = dp->i_mount;
 606         block = bp->data;
 607         xfs_dir2_data_check(dp, bp);
 608         btp = xfs_dir2_block_tail_p(mp, block);
 609         blp = xfs_dir2_block_leaf_p(btp);
 610         /*
 611          * Get the offset from the leaf entry, to point to the data.
 612          */
 613         dep = (xfs_dir2_data_entry_t *)
 614               ((char *)block + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address)));
 615         /*
 616          * Fill in inode number, release the block.
 617          */
 618         args->inumber = be64_to_cpu(dep->inumber);
 619         xfs_da_brelse(args->trans, bp);
 620         return XFS_ERROR(EEXIST);
 621 }
 622
 623 /*
 624  * Internal block lookup routine.
 625  */
 626 static int                                      /* error */
 627 xfs_dir2_block_lookup_int(
 628         xfs_da_args_t           *args,          /* dir lookup arguments */
 629         xfs_dabuf_t             **bpp,          /* returned block buffer */
 630         int                     *entno)         /* returned entry number */
 631 {
 632         xfs_dir2_dataptr_t      addr;           /* data entry address */
 633         xfs_dir2_block_t        *block;         /* block structure */
 634         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 635         xfs_dabuf_t             *bp;            /* block buffer */
 636         xfs_dir2_block_tail_t   *btp;           /* block tail */
 637         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 638         xfs_inode_t             *dp;            /* incore inode */
 639         int                     error;          /* error return value */
 640         xfs_dahash_t            hash;           /* found hash value */
 641         int                     high;           /* binary search high index */
 642         int                     low;            /* binary search low index */
 643         int                     mid;            /* binary search current idx */
 644         xfs_mount_t             *mp;            /* filesystem mount point */
 645         xfs_trans_t             *tp;            /* transaction pointer */
 646
 647         dp = args->dp;
 648         tp = args->trans;
 649         mp = dp->i_mount;
 650         /*
 651          * Read the buffer, return error if we can't get it.
 652          */
 653         if ((error =
 654             xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
 655                 return error;
 656         }
 657         ASSERT(bp != NULL);
 658         block = bp->data;
 659         xfs_dir2_data_check(dp, bp);
 660         btp = xfs_dir2_block_tail_p(mp, block);
 661         blp = xfs_dir2_block_leaf_p(btp);
 662         /*
 663          * Loop doing a binary search for our hash value.
 664          * Find our entry, ENOENT if it's not there.
 665          */
 666         for (low = 0, high = be32_to_cpu(btp->count) - 1; ; ) {
 667                 ASSERT(low <= high);
 668                 mid = (low + high) >> 1;
 669                 if ((hash = be32_to_cpu(blp[mid].hashval)) == args->hashval)
 670                         break;
 671                 if (hash < args->hashval)
 672                         low = mid + 1;
 673                 else
 674                         high = mid - 1;
 675                 if (low > high) {
 676                         ASSERT(args->oknoent);
 677                         xfs_da_brelse(tp, bp);
 678                         return XFS_ERROR(ENOENT);
 679                 }
 680         }
 681         /*
 682          * Back up to the first one with the right hash value.
 683          */
 684         while (mid > 0 && be32_to_cpu(blp[mid - 1].hashval) == args->hashval) {
 685                 mid--;
 686         }
 687         /*
 688          * Now loop forward through all the entries with the
 689          * right hash value looking for our name.
 690          */
 691         do {
 692                 if ((addr = be32_to_cpu(blp[mid].address)) == XFS_DIR2_NULL_DATAPTR)
 693                         continue;
 694                 /*
 695                  * Get pointer to the entry from the leaf.
 696                  */
 697                 dep = (xfs_dir2_data_entry_t *)
 698                         ((char *)block + xfs_dir2_dataptr_to_off(mp, addr));
 699                 /*
 700                  * Compare, if it's right give back buffer & entry number.
 701                  */
 702                 if (dep->namelen == args->namelen &&
 703                     dep->name[0] == args->name[0] &&
 704                     memcmp(dep->name, args->name, args->namelen) == 0) {
 705                         *bpp = bp;
 706                         *entno = mid;
 707                         return 0;
 708                 }
 709         } while (++mid < be32_to_cpu(btp->count) && be32_to_cpu(blp[mid].hashval) == hash);
 710         /*
 711          * No match, release the buffer and return ENOENT.
 712          */
 713         ASSERT(args->oknoent);
 714         xfs_da_brelse(tp, bp);
 715         return XFS_ERROR(ENOENT);
 716 }
 717
 718 /*
 719  * Remove an entry from a block format directory.
 720  * If that makes the block small enough to fit in shortform, transform it.
 721  */
 722 int                                             /* error */
 723 xfs_dir2_block_removename(
 724         xfs_da_args_t           *args)          /* directory operation args */
 725 {
 726         xfs_dir2_block_t        *block;         /* block structure */
 727         xfs_dir2_leaf_entry_t   *blp;           /* block leaf pointer */
 728         xfs_dabuf_t             *bp;            /* block buffer */
 729         xfs_dir2_block_tail_t   *btp;           /* block tail */
 730         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 731         xfs_inode_t             *dp;            /* incore inode */
 732         int                     ent;            /* block leaf entry index */
 733         int                     error;          /* error return value */
 734         xfs_mount_t             *mp;            /* filesystem mount point */
 735         int                     needlog;        /* need to log block header */
 736         int                     needscan;       /* need to fixup bestfree */
 737         xfs_dir2_sf_hdr_t       sfh;            /* shortform header */
 738         int                     size;           /* shortform size */
 739         xfs_trans_t             *tp;            /* transaction pointer */
 740
 741         xfs_dir2_trace_args("block_removename", args);
 742         /*
 743          * Look up the entry in the block.  Gets the buffer and entry index.
 744          * It will always be there, the vnodeops level does a lookup first.
 745          */
 746         if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
 747                 return error;
 748         }
 749         dp = args->dp;
 750         tp = args->trans;
 751         mp = dp->i_mount;
 752         block = bp->data;
 753         btp = xfs_dir2_block_tail_p(mp, block);
 754         blp = xfs_dir2_block_leaf_p(btp);
 755         /*
 756          * Point to the data entry using the leaf entry.
 757          */
 758         dep = (xfs_dir2_data_entry_t *)
 759               ((char *)block + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address)));
 760         /*
 761          * Mark the data entry's space free.
 762          */
 763         needlog = needscan = 0;
 764         xfs_dir2_data_make_free(tp, bp,
 765                 (xfs_dir2_data_aoff_t)((char *)dep - (char *)block),
 766                 xfs_dir2_data_entsize(dep->namelen), &needlog, &needscan);
 767         /*
 768          * Fix up the block tail.
 769          */
 770         be32_add_cpu(&btp->stale, 1);
 771         xfs_dir2_block_log_tail(tp, bp);
 772         /*
 773          * Remove the leaf entry by marking it stale.
 774          */
 775         blp[ent].address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR);
 776         xfs_dir2_block_log_leaf(tp, bp, ent, ent);
 777         /*
 778          * Fix up bestfree, log the header if necessary.
 779          */
 780         if (needscan)
 781                 xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog);
 782         if (needlog)
 783                 xfs_dir2_data_log_header(tp, bp);
 784         xfs_dir2_data_check(dp, bp);
 785         /*
 786          * See if the size as a shortform is good enough.
 787          */
 788         if ((size = xfs_dir2_block_sfsize(dp, block, &sfh)) >
 789             XFS_IFORK_DSIZE(dp)) {
 790                 xfs_da_buf_done(bp);
 791                 return 0;
 792         }
 793         /*
 794          * If it works, do the conversion.
 795          */
 796         return xfs_dir2_block_to_sf(args, bp, size, &sfh);
 797 }
 798
 799 /*
 800  * Replace an entry in a V2 block directory.
 801  * Change the inode number to the new value.
 802  */
 803 int                                             /* error */
 804 xfs_dir2_block_replace(
 805         xfs_da_args_t           *args)          /* directory operation args */
 806 {
 807         xfs_dir2_block_t        *block;         /* block structure */
 808         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 809         xfs_dabuf_t             *bp;            /* block buffer */
 810         xfs_dir2_block_tail_t   *btp;           /* block tail */
 811         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 812         xfs_inode_t             *dp;            /* incore inode */
 813         int                     ent;            /* leaf entry index */
 814         int                     error;          /* error return value */
 815         xfs_mount_t             *mp;            /* filesystem mount point */
 816
 817         xfs_dir2_trace_args("block_replace", args);
 818         /*
 819          * Lookup the entry in the directory.  Get buffer and entry index.
 820          * This will always succeed since the caller has already done a lookup.
 821          */
 822         if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
 823                 return error;
 824         }
 825         dp = args->dp;
 826         mp = dp->i_mount;
 827         block = bp->data;
 828         btp = xfs_dir2_block_tail_p(mp, block);
 829         blp = xfs_dir2_block_leaf_p(btp);
 830         /*
 831          * Point to the data entry we need to change.
 832          */
 833         dep = (xfs_dir2_data_entry_t *)
 834               ((char *)block + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address)));
 835         ASSERT(be64_to_cpu(dep->inumber) != args->inumber);
 836         /*
 837          * Change the inode number to the new value.
 838          */
 839         dep->inumber = cpu_to_be64(args->inumber);
 840         xfs_dir2_data_log_entry(args->trans, bp, dep);
 841         xfs_dir2_data_check(dp, bp);
 842         xfs_da_buf_done(bp);
 843         return 0;
 844 }
 845
 846 /*
 847  * Qsort comparison routine for the block leaf entries.
 848  */
 849 static int                                      /* sort order */
 850 xfs_dir2_block_sort(
 851         const void                      *a,     /* first leaf entry */
 852         const void                      *b)     /* second leaf entry */
 853 {
 854         const xfs_dir2_leaf_entry_t     *la;    /* first leaf entry */
 855         const xfs_dir2_leaf_entry_t     *lb;    /* second leaf entry */
 856
 857         la = a;
 858         lb = b;
 859         return be32_to_cpu(la->hashval) < be32_to_cpu(lb->hashval) ? -1 :
 860                 (be32_to_cpu(la->hashval) > be32_to_cpu(lb->hashval) ? 1 : 0);
 861 }
 862
 863 /*
 864  * Convert a V2 leaf directory to a V2 block directory if possible.
 865  */
 866 int                                             /* error */
 867 xfs_dir2_leaf_to_block(
 868         xfs_da_args_t           *args,          /* operation arguments */
 869         xfs_dabuf_t             *lbp,           /* leaf buffer */
 870         xfs_dabuf_t             *dbp)           /* data buffer */
 871 {
 872         __be16                  *bestsp;        /* leaf bests table */
 873         xfs_dir2_block_t        *block;         /* block structure */
 874         xfs_dir2_block_tail_t   *btp;           /* block tail */
 875         xfs_inode_t             *dp;            /* incore directory inode */
 876         xfs_dir2_data_unused_t  *dup;           /* unused data entry */
 877         int                     error;          /* error return value */
 878         int                     from;           /* leaf from index */
 879         xfs_dir2_leaf_t         *leaf;          /* leaf structure */
 880         xfs_dir2_leaf_entry_t   *lep;           /* leaf entry */
 881         xfs_dir2_leaf_tail_t    *ltp;           /* leaf tail structure */
 882         xfs_mount_t             *mp;            /* file system mount point */
 883         int                     needlog;        /* need to log data header */
 884         int                     needscan;       /* need to scan for bestfree */
 885         xfs_dir2_sf_hdr_t       sfh;            /* shortform header */
 886         int                     size;           /* bytes used */
 887         __be16                  *tagp;          /* end of entry (tag) */
 888         int                     to;             /* block/leaf to index */
 889         xfs_trans_t             *tp;            /* transaction pointer */
 890
 891         xfs_dir2_trace_args_bb("leaf_to_block", args, lbp, dbp);
 892         dp = args->dp;
 893         tp = args->trans;
 894         mp = dp->i_mount;
 895         leaf = lbp->data;
 896         ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAF1_MAGIC);
 897         ltp = xfs_dir2_leaf_tail_p(mp, leaf);
 898         /*
 899          * If there are data blocks other than the first one, take this
 900          * opportunity to remove trailing empty data blocks that may have
 901          * been left behind during no-space-reservation operations.
 902          * These will show up in the leaf bests table.
 903          */
 904         while (dp->i_d.di_size > mp->m_dirblksize) {
 905                 bestsp = xfs_dir2_leaf_bests_p(ltp);
 906                 if (be16_to_cpu(bestsp[be32_to_cpu(ltp->bestcount) - 1]) ==
 907                     mp->m_dirblksize - (uint)sizeof(block->hdr)) {
 908                         if ((error =
 909                             xfs_dir2_leaf_trim_data(args, lbp,
 910                                     (xfs_dir2_db_t)(be32_to_cpu(ltp->bestcount) - 1))))
 911                                 goto out;
 912                 } else {
 913                         error = 0;
 914                         goto out;
 915                 }
 916         }
 917         /*
 918          * Read the data block if we don't already have it, give up if it fails.
 919          */
 920         if (dbp == NULL &&
 921             (error = xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &dbp,
 922                     XFS_DATA_FORK))) {
 923                 goto out;
 924         }
 925         block = dbp->data;
 926         ASSERT(be32_to_cpu(block->hdr.magic) == XFS_DIR2_DATA_MAGIC);
 927         /*
 928          * Size of the "leaf" area in the block.
 929          */
 930         size = (uint)sizeof(block->tail) +
 931                (uint)sizeof(*lep) * (be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale));
 932         /*
 933          * Look at the last data entry.
 934          */
 935         tagp = (__be16 *)((char *)block + mp->m_dirblksize) - 1;
 936         dup = (xfs_dir2_data_unused_t *)((char *)block + be16_to_cpu(*tagp));
 937         /*
 938          * If it's not free or is too short we can't do it.
 939          */
 940         if (be16_to_cpu(dup->freetag) != XFS_DIR2_DATA_FREE_TAG ||
 941             be16_to_cpu(dup->length) < size) {
 942                 error = 0;
 943                 goto out;
 944         }
 945         /*
 946          * Start converting it to block form.
 947          */
 948         block->hdr.magic = cpu_to_be32(XFS_DIR2_BLOCK_MAGIC);
 949         needlog = 1;
 950         needscan = 0;
 951         /*
 952          * Use up the space at the end of the block (blp/btp).
 953          */
 954         xfs_dir2_data_use_free(tp, dbp, dup, mp->m_dirblksize - size, size,
 955                 &needlog, &needscan);
 956         /*
 957          * Initialize the block tail.
 958          */
 959         btp = xfs_dir2_block_tail_p(mp, block);
 960         btp->count = cpu_to_be32(be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale));
 961         btp->stale = 0;
 962         xfs_dir2_block_log_tail(tp, dbp);
 963         /*
 964          * Initialize the block leaf area.  We compact out stale entries.
 965          */
 966         lep = xfs_dir2_block_leaf_p(btp);
 967         for (from = to = 0; from < be16_to_cpu(leaf->hdr.count); from++) {
 968                 if (be32_to_cpu(leaf->ents[from].address) == XFS_DIR2_NULL_DATAPTR)
 969                         continue;
 970                 lep[to++] = leaf->ents[from];
 971         }
 972         ASSERT(to == be32_to_cpu(btp->count));
 973         xfs_dir2_block_log_leaf(tp, dbp, 0, be32_to_cpu(btp->count) - 1);
 974         /*
 975          * Scan the bestfree if we need it and log the data block header.
 976          */
 977         if (needscan)
 978                 xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog);
 979         if (needlog)
 980                 xfs_dir2_data_log_header(tp, dbp);
 981         /*
 982          * Pitch the old leaf block.
 983          */
 984         error = xfs_da_shrink_inode(args, mp->m_dirleafblk, lbp);
 985         lbp = NULL;
 986         if (error) {
 987                 goto out;
 988         }
 989         /*
 990          * Now see if the resulting block can be shrunken to shortform.
 991          */
 992         if ((size = xfs_dir2_block_sfsize(dp, block, &sfh)) >
 993             XFS_IFORK_DSIZE(dp)) {
 994                 error = 0;
 995                 goto out;
 996         }
 997         return xfs_dir2_block_to_sf(args, dbp, size, &sfh);
 998 out:
 999         if (lbp)
1000                 xfs_da_buf_done(lbp);
1001         if (dbp)
1002                 xfs_da_buf_done(dbp);
1003         return error;
1004 }
1005
1006 /*
1007  * Convert the shortform directory to block form.
1008  */
1009 int                                             /* error */
1010 xfs_dir2_sf_to_block(
1011         xfs_da_args_t           *args)          /* operation arguments */
1012 {
1013         xfs_dir2_db_t           blkno;          /* dir-relative block # (0) */
1014         xfs_dir2_block_t        *block;         /* block structure */
1015         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
1016         xfs_dabuf_t             *bp;            /* block buffer */
1017         xfs_dir2_block_tail_t   *btp;           /* block tail pointer */
1018         char                    *buf;           /* sf buffer */
1019         int                     buf_len;
1020         xfs_dir2_data_entry_t   *dep;           /* data entry pointer */
1021         xfs_inode_t             *dp;            /* incore directory inode */
1022         int                     dummy;          /* trash */
1023         xfs_dir2_data_unused_t  *dup;           /* unused entry pointer */
1024         int                     endoffset;      /* end of data objects */
1025         int                     error;          /* error return value */
1026         int                     i;              /* index */
1027         xfs_mount_t             *mp;            /* filesystem mount point */
1028         int                     needlog;        /* need to log block header */
1029         int                     needscan;       /* need to scan block freespc */
1030         int                     newoffset;      /* offset from current entry */
1031         int                     offset;         /* target block offset */
1032         xfs_dir2_sf_entry_t     *sfep;          /* sf entry pointer */
1033         xfs_dir2_sf_t           *sfp;           /* shortform structure */
1034         __be16                  *tagp;          /* end of data entry */
1035         xfs_trans_t             *tp;            /* transaction pointer */
1036
1037         xfs_dir2_trace_args("sf_to_block", args);
1038         dp = args->dp;
1039         tp = args->trans;
1040         mp = dp->i_mount;
1041         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
1042         /*
1043          * Bomb out if the shortform directory is way too short.
1044          */
1045         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
1046                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1047                 return XFS_ERROR(EIO);
1048         }
1049         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
1050         ASSERT(dp->i_df.if_u1.if_data != NULL);
1051         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1052         ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
1053         /*
1054          * Copy the directory into the stack buffer.
1055          * Then pitch the incore inode data so we can make extents.
1056          */
1057
1058         buf_len = dp->i_df.if_bytes;
1059         buf = kmem_alloc(dp->i_df.if_bytes, KM_SLEEP);
1060
1061         memcpy(buf, sfp, dp->i_df.if_bytes);
1062         xfs_idata_realloc(dp, -dp->i_df.if_bytes, XFS_DATA_FORK);
1063         dp->i_d.di_size = 0;
1064         xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1065         /*
1066          * Reset pointer - old sfp is gone.
1067          */
1068         sfp = (xfs_dir2_sf_t *)buf;
1069         /*
1070          * Add block 0 to the inode.
1071          */
1072         error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE, &blkno);
1073         if (error) {
1074                 kmem_free(buf, buf_len);
1075                 return error;
1076         }
1077         /*
1078          * Initialize the data block.
1079          */
1080         error = xfs_dir2_data_init(args, blkno, &bp);
1081         if (error) {
1082                 kmem_free(buf, buf_len);
1083                 return error;
1084         }
1085         block = bp->data;
1086         block->hdr.magic = cpu_to_be32(XFS_DIR2_BLOCK_MAGIC);
1087         /*
1088          * Compute size of block "tail" area.
1089          */
1090         i = (uint)sizeof(*btp) +
1091             (sfp->hdr.count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t);
1092         /*
1093          * The whole thing is initialized to free by the init routine.
1094          * Say we're using the leaf and tail area.
1095          */
1096         dup = (xfs_dir2_data_unused_t *)block->u;
1097         needlog = needscan = 0;
1098         xfs_dir2_data_use_free(tp, bp, dup, mp->m_dirblksize - i, i, &needlog,
1099                 &needscan);
1100         ASSERT(needscan == 0);
1101         /*
1102          * Fill in the tail.
1103          */
1104         btp = xfs_dir2_block_tail_p(mp, block);
1105         btp->count = cpu_to_be32(sfp->hdr.count + 2);   /* ., .. */
1106         btp->stale = 0;
1107         blp = xfs_dir2_block_leaf_p(btp);
1108         endoffset = (uint)((char *)blp - (char *)block);
1109         /*
1110          * Remove the freespace, we'll manage it.
1111          */
1112         xfs_dir2_data_use_free(tp, bp, dup,
1113                 (xfs_dir2_data_aoff_t)((char *)dup - (char *)block),
1114                 be16_to_cpu(dup->length), &needlog, &needscan);
1115         /*
1116          * Create entry for .
1117          */
1118         dep = (xfs_dir2_data_entry_t *)
1119               ((char *)block + XFS_DIR2_DATA_DOT_OFFSET);
1120         dep->inumber = cpu_to_be64(dp->i_ino);
1121         dep->namelen = 1;
1122         dep->name[0] = '.';
1123         tagp = xfs_dir2_data_entry_tag_p(dep);
1124         *tagp = cpu_to_be16((char *)dep - (char *)block);
1125         xfs_dir2_data_log_entry(tp, bp, dep);
1126         blp[0].hashval = cpu_to_be32(xfs_dir_hash_dot);
1127         blp[0].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,
1128                                 (char *)dep - (char *)block));
1129         /*
1130          * Create entry for ..
1131          */
1132         dep = (xfs_dir2_data_entry_t *)
1133                 ((char *)block + XFS_DIR2_DATA_DOTDOT_OFFSET);
1134         dep->inumber = cpu_to_be64(xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent));
1135         dep->namelen = 2;
1136         dep->name[0] = dep->name[1] = '.';
1137         tagp = xfs_dir2_data_entry_tag_p(dep);
1138         *tagp = cpu_to_be16((char *)dep - (char *)block);
1139         xfs_dir2_data_log_entry(tp, bp, dep);
1140         blp[1].hashval = cpu_to_be32(xfs_dir_hash_dotdot);
1141         blp[1].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,
1142                                 (char *)dep - (char *)block));
1143         offset = XFS_DIR2_DATA_FIRST_OFFSET;
1144         /*
1145          * Loop over existing entries, stuff them in.
1146          */
1147         if ((i = 0) == sfp->hdr.count)
1148                 sfep = NULL;
1149         else
1150                 sfep = xfs_dir2_sf_firstentry(sfp);
1151         /*
1152          * Need to preserve the existing offset values in the sf directory.
1153          * Insert holes (unused entries) where necessary.
1154          */
1155         while (offset < endoffset) {
1156                 /*
1157                  * sfep is null when we reach the end of the list.
1158                  */
1159                 if (sfep == NULL)
1160                         newoffset = endoffset;
1161                 else
1162                         newoffset = xfs_dir2_sf_get_offset(sfep);
1163                 /*
1164                  * There should be a hole here, make one.
1165                  */
1166                 if (offset < newoffset) {
1167                         dup = (xfs_dir2_data_unused_t *)
1168                               ((char *)block + offset);
1169                         dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
1170                         dup->length = cpu_to_be16(newoffset - offset);
1171                         *xfs_dir2_data_unused_tag_p(dup) = cpu_to_be16(
1172                                 ((char *)dup - (char *)block));
1173                         xfs_dir2_data_log_unused(tp, bp, dup);
1174                         (void)xfs_dir2_data_freeinsert((xfs_dir2_data_t *)block,
1175                                 dup, &dummy);
1176                         offset += be16_to_cpu(dup->length);
1177                         continue;
1178                 }
1179                 /*
1180                  * Copy a real entry.
1181                  */
1182                 dep = (xfs_dir2_data_entry_t *)((char *)block + newoffset);
1183                 dep->inumber = cpu_to_be64(xfs_dir2_sf_get_inumber(sfp,
1184                                 xfs_dir2_sf_inumberp(sfep)));
1185                 dep->namelen = sfep->namelen;
1186                 memcpy(dep->name, sfep->name, dep->namelen);
1187                 tagp = xfs_dir2_data_entry_tag_p(dep);
1188                 *tagp = cpu_to_be16((char *)dep - (char *)block);
1189                 xfs_dir2_data_log_entry(tp, bp, dep);
1190                 blp[2 + i].hashval = cpu_to_be32(xfs_da_hashname(
1191                                         (char *)sfep->name, sfep->namelen));
1192                 blp[2 + i].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,
1193                                                  (char *)dep - (char *)block));
1194                 offset = (int)((char *)(tagp + 1) - (char *)block);
1195                 if (++i == sfp->hdr.count)
1196                         sfep = NULL;
1197                 else
1198                         sfep = xfs_dir2_sf_nextentry(sfp, sfep);
1199         }
1200         /* Done with the temporary buffer */
1201         kmem_free(buf, buf_len);
1202         /*
1203          * Sort the leaf entries by hash value.
1204          */
1205         xfs_sort(blp, be32_to_cpu(btp->count), sizeof(*blp), xfs_dir2_block_sort);
1206         /*
1207          * Log the leaf entry area and tail.
1208          * Already logged the header in data_init, ignore needlog.
1209          */
1210         ASSERT(needscan == 0);
1211         xfs_dir2_block_log_leaf(tp, bp, 0, be32_to_cpu(btp->count) - 1);
1212         xfs_dir2_block_log_tail(tp, bp);
1213         xfs_dir2_data_check(dp, bp);
1214         xfs_da_buf_done(bp);
1215         return 0;
1216 }