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->op_flags & XFS_DA_OP_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->op_flags & XFS_DA_OP_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->op_flags & XFS_DA_OP_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 *)((char *)block +
 614                 xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address)));
 615         /*
 616          * Fill in inode number, CI name if appropriate, release the block.
 617          */
 618         args->inumber = be64_to_cpu(dep->inumber);
 619         error = xfs_dir_cilookup_result(args, dep->name, dep->namelen);
 620         xfs_da_brelse(args->trans, bp);
 621         return XFS_ERROR(error);
 622 }
 623
 624 /*
 625  * Internal block lookup routine.
 626  */
 627 static int                                      /* error */
 628 xfs_dir2_block_lookup_int(
 629         xfs_da_args_t           *args,          /* dir lookup arguments */
 630         xfs_dabuf_t             **bpp,          /* returned block buffer */
 631         int                     *entno)         /* returned entry number */
 632 {
 633         xfs_dir2_dataptr_t      addr;           /* data entry address */
 634         xfs_dir2_block_t        *block;         /* block structure */
 635         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 636         xfs_dabuf_t             *bp;            /* block buffer */
 637         xfs_dir2_block_tail_t   *btp;           /* block tail */
 638         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 639         xfs_inode_t             *dp;            /* incore inode */
 640         int                     error;          /* error return value */
 641         xfs_dahash_t            hash;           /* found hash value */
 642         int                     high;           /* binary search high index */
 643         int                     low;            /* binary search low index */
 644         int                     mid;            /* binary search current idx */
 645         xfs_mount_t             *mp;            /* filesystem mount point */
 646         xfs_trans_t             *tp;            /* transaction pointer */
 647         enum xfs_dacmp          cmp;            /* comparison result */
 648
 649         dp = args->dp;
 650         tp = args->trans;
 651         mp = dp->i_mount;
 652         /*
 653          * Read the buffer, return error if we can't get it.
 654          */
 655         if ((error =
 656             xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
 657                 return error;
 658         }
 659         ASSERT(bp != NULL);
 660         block = bp->data;
 661         xfs_dir2_data_check(dp, bp);
 662         btp = xfs_dir2_block_tail_p(mp, block);
 663         blp = xfs_dir2_block_leaf_p(btp);
 664         /*
 665          * Loop doing a binary search for our hash value.
 666          * Find our entry, ENOENT if it's not there.
 667          */
 668         for (low = 0, high = be32_to_cpu(btp->count) - 1; ; ) {
 669                 ASSERT(low <= high);
 670                 mid = (low + high) >> 1;
 671                 if ((hash = be32_to_cpu(blp[mid].hashval)) == args->hashval)
 672                         break;
 673                 if (hash < args->hashval)
 674                         low = mid + 1;
 675                 else
 676                         high = mid - 1;
 677                 if (low > high) {
 678                         ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 679                         xfs_da_brelse(tp, bp);
 680                         return XFS_ERROR(ENOENT);
 681                 }
 682         }
 683         /*
 684          * Back up to the first one with the right hash value.
 685          */
 686         while (mid > 0 && be32_to_cpu(blp[mid - 1].hashval) == args->hashval) {
 687                 mid--;
 688         }
 689         /*
 690          * Now loop forward through all the entries with the
 691          * right hash value looking for our name.
 692          */
 693         do {
 694                 if ((addr = be32_to_cpu(blp[mid].address)) == XFS_DIR2_NULL_DATAPTR)
 695                         continue;
 696                 /*
 697                  * Get pointer to the entry from the leaf.
 698                  */
 699                 dep = (xfs_dir2_data_entry_t *)
 700                         ((char *)block + xfs_dir2_dataptr_to_off(mp, addr));
 701                 /*
 702                  * Compare name and if it's an exact match, return the index
 703                  * and buffer. If it's the first case-insensitive match, store
 704                  * the index and buffer and continue looking for an exact match.
 705                  */
 706                 cmp = mp->m_dirnameops->compname(args, dep->name, dep->namelen);
 707                 if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
 708                         args->cmpresult = cmp;
 709                         *bpp = bp;
 710                         *entno = mid;
 711                         if (cmp == XFS_CMP_EXACT)
 712                                 return 0;
 713                 }
 714         } while (++mid < be32_to_cpu(btp->count) &&
 715                         be32_to_cpu(blp[mid].hashval) == hash);
 716
 717         ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 718         /*
 719          * Here, we can only be doing a lookup (not a rename or replace).
 720          * If a case-insensitive match was found earlier, return success.
 721          */
 722         if (args->cmpresult == XFS_CMP_CASE)
 723                 return 0;
 724         /*
 725          * No match, release the buffer and return ENOENT.
 726          */
 727         xfs_da_brelse(tp, bp);
 728         return XFS_ERROR(ENOENT);
 729 }
 730
 731 /*
 732  * Remove an entry from a block format directory.
 733  * If that makes the block small enough to fit in shortform, transform it.
 734  */
 735 int                                             /* error */
 736 xfs_dir2_block_removename(
 737         xfs_da_args_t           *args)          /* directory operation args */
 738 {
 739         xfs_dir2_block_t        *block;         /* block structure */
 740         xfs_dir2_leaf_entry_t   *blp;           /* block leaf pointer */
 741         xfs_dabuf_t             *bp;            /* block buffer */
 742         xfs_dir2_block_tail_t   *btp;           /* block tail */
 743         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 744         xfs_inode_t             *dp;            /* incore inode */
 745         int                     ent;            /* block leaf entry index */
 746         int                     error;          /* error return value */
 747         xfs_mount_t             *mp;            /* filesystem mount point */
 748         int                     needlog;        /* need to log block header */
 749         int                     needscan;       /* need to fixup bestfree */
 750         xfs_dir2_sf_hdr_t       sfh;            /* shortform header */
 751         int                     size;           /* shortform size */
 752         xfs_trans_t             *tp;            /* transaction pointer */
 753
 754         xfs_dir2_trace_args("block_removename", args);
 755         /*
 756          * Look up the entry in the block.  Gets the buffer and entry index.
 757          * It will always be there, the vnodeops level does a lookup first.
 758          */
 759         if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
 760                 return error;
 761         }
 762         dp = args->dp;
 763         tp = args->trans;
 764         mp = dp->i_mount;
 765         block = bp->data;
 766         btp = xfs_dir2_block_tail_p(mp, block);
 767         blp = xfs_dir2_block_leaf_p(btp);
 768         /*
 769          * Point to the data entry using the leaf entry.
 770          */
 771         dep = (xfs_dir2_data_entry_t *)
 772               ((char *)block + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address)));
 773         /*
 774          * Mark the data entry's space free.
 775          */
 776         needlog = needscan = 0;
 777         xfs_dir2_data_make_free(tp, bp,
 778                 (xfs_dir2_data_aoff_t)((char *)dep - (char *)block),
 779                 xfs_dir2_data_entsize(dep->namelen), &needlog, &needscan);
 780         /*
 781          * Fix up the block tail.
 782          */
 783         be32_add_cpu(&btp->stale, 1);
 784         xfs_dir2_block_log_tail(tp, bp);
 785         /*
 786          * Remove the leaf entry by marking it stale.
 787          */
 788         blp[ent].address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR);
 789         xfs_dir2_block_log_leaf(tp, bp, ent, ent);
 790         /*
 791          * Fix up bestfree, log the header if necessary.
 792          */
 793         if (needscan)
 794                 xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog);
 795         if (needlog)
 796                 xfs_dir2_data_log_header(tp, bp);
 797         xfs_dir2_data_check(dp, bp);
 798         /*
 799          * See if the size as a shortform is good enough.
 800          */
 801         if ((size = xfs_dir2_block_sfsize(dp, block, &sfh)) >
 802             XFS_IFORK_DSIZE(dp)) {
 803                 xfs_da_buf_done(bp);
 804                 return 0;
 805         }
 806         /*
 807          * If it works, do the conversion.
 808          */
 809         return xfs_dir2_block_to_sf(args, bp, size, &sfh);
 810 }
 811
 812 /*
 813  * Replace an entry in a V2 block directory.
 814  * Change the inode number to the new value.
 815  */
 816 int                                             /* error */
 817 xfs_dir2_block_replace(
 818         xfs_da_args_t           *args)          /* directory operation args */
 819 {
 820         xfs_dir2_block_t        *block;         /* block structure */
 821         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 822         xfs_dabuf_t             *bp;            /* block buffer */
 823         xfs_dir2_block_tail_t   *btp;           /* block tail */
 824         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 825         xfs_inode_t             *dp;            /* incore inode */
 826         int                     ent;            /* leaf entry index */
 827         int                     error;          /* error return value */
 828         xfs_mount_t             *mp;            /* filesystem mount point */
 829
 830         xfs_dir2_trace_args("block_replace", args);
 831         /*
 832          * Lookup the entry in the directory.  Get buffer and entry index.
 833          * This will always succeed since the caller has already done a lookup.
 834          */
 835         if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
 836                 return error;
 837         }
 838         dp = args->dp;
 839         mp = dp->i_mount;
 840         block = bp->data;
 841         btp = xfs_dir2_block_tail_p(mp, block);
 842         blp = xfs_dir2_block_leaf_p(btp);
 843         /*
 844          * Point to the data entry we need to change.
 845          */
 846         dep = (xfs_dir2_data_entry_t *)
 847               ((char *)block + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address)));
 848         ASSERT(be64_to_cpu(dep->inumber) != args->inumber);
 849         /*
 850          * Change the inode number to the new value.
 851          */
 852         dep->inumber = cpu_to_be64(args->inumber);
 853         xfs_dir2_data_log_entry(args->trans, bp, dep);
 854         xfs_dir2_data_check(dp, bp);
 855         xfs_da_buf_done(bp);
 856         return 0;
 857 }
 858
 859 /*
 860  * Qsort comparison routine for the block leaf entries.
 861  */
 862 static int                                      /* sort order */
 863 xfs_dir2_block_sort(
 864         const void                      *a,     /* first leaf entry */
 865         const void                      *b)     /* second leaf entry */
 866 {
 867         const xfs_dir2_leaf_entry_t     *la;    /* first leaf entry */
 868         const xfs_dir2_leaf_entry_t     *lb;    /* second leaf entry */
 869
 870         la = a;
 871         lb = b;
 872         return be32_to_cpu(la->hashval) < be32_to_cpu(lb->hashval) ? -1 :
 873                 (be32_to_cpu(la->hashval) > be32_to_cpu(lb->hashval) ? 1 : 0);
 874 }
 875
 876 /*
 877  * Convert a V2 leaf directory to a V2 block directory if possible.
 878  */
 879 int                                             /* error */
 880 xfs_dir2_leaf_to_block(
 881         xfs_da_args_t           *args,          /* operation arguments */
 882         xfs_dabuf_t             *lbp,           /* leaf buffer */
 883         xfs_dabuf_t             *dbp)           /* data buffer */
 884 {
 885         __be16                  *bestsp;        /* leaf bests table */
 886         xfs_dir2_block_t        *block;         /* block structure */
 887         xfs_dir2_block_tail_t   *btp;           /* block tail */
 888         xfs_inode_t             *dp;            /* incore directory inode */
 889         xfs_dir2_data_unused_t  *dup;           /* unused data entry */
 890         int                     error;          /* error return value */
 891         int                     from;           /* leaf from index */
 892         xfs_dir2_leaf_t         *leaf;          /* leaf structure */
 893         xfs_dir2_leaf_entry_t   *lep;           /* leaf entry */
 894         xfs_dir2_leaf_tail_t    *ltp;           /* leaf tail structure */
 895         xfs_mount_t             *mp;            /* file system mount point */
 896         int                     needlog;        /* need to log data header */
 897         int                     needscan;       /* need to scan for bestfree */
 898         xfs_dir2_sf_hdr_t       sfh;            /* shortform header */
 899         int                     size;           /* bytes used */
 900         __be16                  *tagp;          /* end of entry (tag) */
 901         int                     to;             /* block/leaf to index */
 902         xfs_trans_t             *tp;            /* transaction pointer */
 903
 904         xfs_dir2_trace_args_bb("leaf_to_block", args, lbp, dbp);
 905         dp = args->dp;
 906         tp = args->trans;
 907         mp = dp->i_mount;
 908         leaf = lbp->data;
 909         ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAF1_MAGIC);
 910         ltp = xfs_dir2_leaf_tail_p(mp, leaf);
 911         /*
 912          * If there are data blocks other than the first one, take this
 913          * opportunity to remove trailing empty data blocks that may have
 914          * been left behind during no-space-reservation operations.
 915          * These will show up in the leaf bests table.
 916          */
 917         while (dp->i_d.di_size > mp->m_dirblksize) {
 918                 bestsp = xfs_dir2_leaf_bests_p(ltp);
 919                 if (be16_to_cpu(bestsp[be32_to_cpu(ltp->bestcount) - 1]) ==
 920                     mp->m_dirblksize - (uint)sizeof(block->hdr)) {
 921                         if ((error =
 922                             xfs_dir2_leaf_trim_data(args, lbp,
 923                                     (xfs_dir2_db_t)(be32_to_cpu(ltp->bestcount) - 1))))
 924                                 goto out;
 925                 } else {
 926                         error = 0;
 927                         goto out;
 928                 }
 929         }
 930         /*
 931          * Read the data block if we don't already have it, give up if it fails.
 932          */
 933         if (dbp == NULL &&
 934             (error = xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &dbp,
 935                     XFS_DATA_FORK))) {
 936                 goto out;
 937         }
 938         block = dbp->data;
 939         ASSERT(be32_to_cpu(block->hdr.magic) == XFS_DIR2_DATA_MAGIC);
 940         /*
 941          * Size of the "leaf" area in the block.
 942          */
 943         size = (uint)sizeof(block->tail) +
 944                (uint)sizeof(*lep) * (be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale));
 945         /*
 946          * Look at the last data entry.
 947          */
 948         tagp = (__be16 *)((char *)block + mp->m_dirblksize) - 1;
 949         dup = (xfs_dir2_data_unused_t *)((char *)block + be16_to_cpu(*tagp));
 950         /*
 951          * If it's not free or is too short we can't do it.
 952          */
 953         if (be16_to_cpu(dup->freetag) != XFS_DIR2_DATA_FREE_TAG ||
 954             be16_to_cpu(dup->length) < size) {
 955                 error = 0;
 956                 goto out;
 957         }
 958         /*
 959          * Start converting it to block form.
 960          */
 961         block->hdr.magic = cpu_to_be32(XFS_DIR2_BLOCK_MAGIC);
 962         needlog = 1;
 963         needscan = 0;
 964         /*
 965          * Use up the space at the end of the block (blp/btp).
 966          */
 967         xfs_dir2_data_use_free(tp, dbp, dup, mp->m_dirblksize - size, size,
 968                 &needlog, &needscan);
 969         /*
 970          * Initialize the block tail.
 971          */
 972         btp = xfs_dir2_block_tail_p(mp, block);
 973         btp->count = cpu_to_be32(be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale));
 974         btp->stale = 0;
 975         xfs_dir2_block_log_tail(tp, dbp);
 976         /*
 977          * Initialize the block leaf area.  We compact out stale entries.
 978          */
 979         lep = xfs_dir2_block_leaf_p(btp);
 980         for (from = to = 0; from < be16_to_cpu(leaf->hdr.count); from++) {
 981                 if (be32_to_cpu(leaf->ents[from].address) == XFS_DIR2_NULL_DATAPTR)
 982                         continue;
 983                 lep[to++] = leaf->ents[from];
 984         }
 985         ASSERT(to == be32_to_cpu(btp->count));
 986         xfs_dir2_block_log_leaf(tp, dbp, 0, be32_to_cpu(btp->count) - 1);
 987         /*
 988          * Scan the bestfree if we need it and log the data block header.
 989          */
 990         if (needscan)
 991                 xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog);
 992         if (needlog)
 993                 xfs_dir2_data_log_header(tp, dbp);
 994         /*
 995          * Pitch the old leaf block.
 996          */
 997         error = xfs_da_shrink_inode(args, mp->m_dirleafblk, lbp);
 998         lbp = NULL;
 999         if (error) {
1000                 goto out;
1001         }
1002         /*
1003          * Now see if the resulting block can be shrunken to shortform.
1004          */
1005         if ((size = xfs_dir2_block_sfsize(dp, block, &sfh)) >
1006             XFS_IFORK_DSIZE(dp)) {
1007                 error = 0;
1008                 goto out;
1009         }
1010         return xfs_dir2_block_to_sf(args, dbp, size, &sfh);
1011 out:
1012         if (lbp)
1013                 xfs_da_buf_done(lbp);
1014         if (dbp)
1015                 xfs_da_buf_done(dbp);
1016         return error;
1017 }
1018
1019 /*
1020  * Convert the shortform directory to block form.
1021  */
1022 int                                             /* error */
1023 xfs_dir2_sf_to_block(
1024         xfs_da_args_t           *args)          /* operation arguments */
1025 {
1026         xfs_dir2_db_t           blkno;          /* dir-relative block # (0) */
1027         xfs_dir2_block_t        *block;         /* block structure */
1028         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
1029         xfs_dabuf_t             *bp;            /* block buffer */
1030         xfs_dir2_block_tail_t   *btp;           /* block tail pointer */
1031         char                    *buf;           /* sf buffer */
1032         int                     buf_len;
1033         xfs_dir2_data_entry_t   *dep;           /* data entry pointer */
1034         xfs_inode_t             *dp;            /* incore directory inode */
1035         int                     dummy;          /* trash */
1036         xfs_dir2_data_unused_t  *dup;           /* unused entry pointer */
1037         int                     endoffset;      /* end of data objects */
1038         int                     error;          /* error return value */
1039         int                     i;              /* index */
1040         xfs_mount_t             *mp;            /* filesystem mount point */
1041         int                     needlog;        /* need to log block header */
1042         int                     needscan;       /* need to scan block freespc */
1043         int                     newoffset;      /* offset from current entry */
1044         int                     offset;         /* target block offset */
1045         xfs_dir2_sf_entry_t     *sfep;          /* sf entry pointer */
1046         xfs_dir2_sf_t           *sfp;           /* shortform structure */
1047         __be16                  *tagp;          /* end of data entry */
1048         xfs_trans_t             *tp;            /* transaction pointer */
1049         struct xfs_name         name;
1050
1051         xfs_dir2_trace_args("sf_to_block", args);
1052         dp = args->dp;
1053         tp = args->trans;
1054         mp = dp->i_mount;
1055         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
1056         /*
1057          * Bomb out if the shortform directory is way too short.
1058          */
1059         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
1060                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1061                 return XFS_ERROR(EIO);
1062         }
1063         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
1064         ASSERT(dp->i_df.if_u1.if_data != NULL);
1065         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1066         ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
1067         /*
1068          * Copy the directory into the stack buffer.
1069          * Then pitch the incore inode data so we can make extents.
1070          */
1071
1072         buf_len = dp->i_df.if_bytes;
1073         buf = kmem_alloc(dp->i_df.if_bytes, KM_SLEEP);
1074
1075         memcpy(buf, sfp, dp->i_df.if_bytes);
1076         xfs_idata_realloc(dp, -dp->i_df.if_bytes, XFS_DATA_FORK);
1077         dp->i_d.di_size = 0;
1078         xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1079         /*
1080          * Reset pointer - old sfp is gone.
1081          */
1082         sfp = (xfs_dir2_sf_t *)buf;
1083         /*
1084          * Add block 0 to the inode.
1085          */
1086         error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE, &blkno);
1087         if (error) {
1088                 kmem_free(buf);
1089                 return error;
1090         }
1091         /*
1092          * Initialize the data block.
1093          */
1094         error = xfs_dir2_data_init(args, blkno, &bp);
1095         if (error) {
1096                 kmem_free(buf);
1097                 return error;
1098         }
1099         block = bp->data;
1100         block->hdr.magic = cpu_to_be32(XFS_DIR2_BLOCK_MAGIC);
1101         /*
1102          * Compute size of block "tail" area.
1103          */
1104         i = (uint)sizeof(*btp) +
1105             (sfp->hdr.count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t);
1106         /*
1107          * The whole thing is initialized to free by the init routine.
1108          * Say we're using the leaf and tail area.
1109          */
1110         dup = (xfs_dir2_data_unused_t *)block->u;
1111         needlog = needscan = 0;
1112         xfs_dir2_data_use_free(tp, bp, dup, mp->m_dirblksize - i, i, &needlog,
1113                 &needscan);
1114         ASSERT(needscan == 0);
1115         /*
1116          * Fill in the tail.
1117          */
1118         btp = xfs_dir2_block_tail_p(mp, block);
1119         btp->count = cpu_to_be32(sfp->hdr.count + 2);   /* ., .. */
1120         btp->stale = 0;
1121         blp = xfs_dir2_block_leaf_p(btp);
1122         endoffset = (uint)((char *)blp - (char *)block);
1123         /*
1124          * Remove the freespace, we'll manage it.
1125          */
1126         xfs_dir2_data_use_free(tp, bp, dup,
1127                 (xfs_dir2_data_aoff_t)((char *)dup - (char *)block),
1128                 be16_to_cpu(dup->length), &needlog, &needscan);
1129         /*
1130          * Create entry for .
1131          */
1132         dep = (xfs_dir2_data_entry_t *)
1133               ((char *)block + XFS_DIR2_DATA_DOT_OFFSET);
1134         dep->inumber = cpu_to_be64(dp->i_ino);
1135         dep->namelen = 1;
1136         dep->name[0] = '.';
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[0].hashval = cpu_to_be32(xfs_dir_hash_dot);
1141         blp[0].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,
1142                                 (char *)dep - (char *)block));
1143         /*
1144          * Create entry for ..
1145          */
1146         dep = (xfs_dir2_data_entry_t *)
1147                 ((char *)block + XFS_DIR2_DATA_DOTDOT_OFFSET);
1148         dep->inumber = cpu_to_be64(xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent));
1149         dep->namelen = 2;
1150         dep->name[0] = dep->name[1] = '.';
1151         tagp = xfs_dir2_data_entry_tag_p(dep);
1152         *tagp = cpu_to_be16((char *)dep - (char *)block);
1153         xfs_dir2_data_log_entry(tp, bp, dep);
1154         blp[1].hashval = cpu_to_be32(xfs_dir_hash_dotdot);
1155         blp[1].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,
1156                                 (char *)dep - (char *)block));
1157         offset = XFS_DIR2_DATA_FIRST_OFFSET;
1158         /*
1159          * Loop over existing entries, stuff them in.
1160          */
1161         if ((i = 0) == sfp->hdr.count)
1162                 sfep = NULL;
1163         else
1164                 sfep = xfs_dir2_sf_firstentry(sfp);
1165         /*
1166          * Need to preserve the existing offset values in the sf directory.
1167          * Insert holes (unused entries) where necessary.
1168          */
1169         while (offset < endoffset) {
1170                 /*
1171                  * sfep is null when we reach the end of the list.
1172                  */
1173                 if (sfep == NULL)
1174                         newoffset = endoffset;
1175                 else
1176                         newoffset = xfs_dir2_sf_get_offset(sfep);
1177                 /*
1178                  * There should be a hole here, make one.
1179                  */
1180                 if (offset < newoffset) {
1181                         dup = (xfs_dir2_data_unused_t *)
1182                               ((char *)block + offset);
1183                         dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
1184                         dup->length = cpu_to_be16(newoffset - offset);
1185                         *xfs_dir2_data_unused_tag_p(dup) = cpu_to_be16(
1186                                 ((char *)dup - (char *)block));
1187                         xfs_dir2_data_log_unused(tp, bp, dup);
1188                         (void)xfs_dir2_data_freeinsert((xfs_dir2_data_t *)block,
1189                                 dup, &dummy);
1190                         offset += be16_to_cpu(dup->length);
1191                         continue;
1192                 }
1193                 /*
1194                  * Copy a real entry.
1195                  */
1196                 dep = (xfs_dir2_data_entry_t *)((char *)block + newoffset);
1197                 dep->inumber = cpu_to_be64(xfs_dir2_sf_get_inumber(sfp,
1198                                 xfs_dir2_sf_inumberp(sfep)));
1199                 dep->namelen = sfep->namelen;
1200                 memcpy(dep->name, sfep->name, dep->namelen);
1201                 tagp = xfs_dir2_data_entry_tag_p(dep);
1202                 *tagp = cpu_to_be16((char *)dep - (char *)block);
1203                 xfs_dir2_data_log_entry(tp, bp, dep);
1204                 name.name = sfep->name;
1205                 name.len = sfep->namelen;
1206                 blp[2 + i].hashval = cpu_to_be32(mp->m_dirnameops->
1207                                                         hashname(&name));
1208                 blp[2 + i].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,
1209                                                  (char *)dep - (char *)block));
1210                 offset = (int)((char *)(tagp + 1) - (char *)block);
1211                 if (++i == sfp->hdr.count)
1212                         sfep = NULL;
1213                 else
1214                         sfep = xfs_dir2_sf_nextentry(sfp, sfep);
1215         }
1216         /* Done with the temporary buffer */
1217         kmem_free(buf);
1218         /*
1219          * Sort the leaf entries by hash value.
1220          */
1221         xfs_sort(blp, be32_to_cpu(btp->count), sizeof(*blp), xfs_dir2_block_sort);
1222         /*
1223          * Log the leaf entry area and tail.
1224          * Already logged the header in data_init, ignore needlog.
1225          */
1226         ASSERT(needscan == 0);
1227         xfs_dir2_block_log_leaf(tp, bp, 0, be32_to_cpu(btp->count) - 1);
1228         xfs_dir2_block_log_tail(tp, bp);
1229         xfs_dir2_data_check(dp, bp);
1230         xfs_da_buf_done(bp);
1231         return 0;
1232 }