git.oblomov.eu Git - linux-2.6/blob - 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(&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(&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(&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                                                     ptr - (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 = xfs_dir2_db_off_to_dataptr(mp,
 523                                         mp->m_dirdatablk,
 524                                         (char *)dep - (char *)block);
 525                         xfs_da_brelse(NULL, bp);
 526                         return 0;
 527                 }
 528         }
 529
 530         /*
 531          * Reached the end of the block.
 532          * Set the offset to a non-existent block 1 and return.
 533          */
 534         *offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk + 1, 0);
 535         xfs_da_brelse(NULL, bp);
 536         return 0;
 537 }
 538
 539 /*
 540  * Log leaf entries from the block.
 541  */
 542 static void
 543 xfs_dir2_block_log_leaf(
 544         xfs_trans_t             *tp,            /* transaction structure */
 545         xfs_dabuf_t             *bp,            /* block buffer */
 546         int                     first,          /* index of first logged leaf */
 547         int                     last)           /* index of last logged leaf */
 548 {
 549         xfs_dir2_block_t        *block;         /* directory block structure */
 550         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 551         xfs_dir2_block_tail_t   *btp;           /* block tail */
 552         xfs_mount_t             *mp;            /* filesystem mount point */
 553
 554         mp = tp->t_mountp;
 555         block = bp->data;
 556         btp = xfs_dir2_block_tail_p(mp, block);
 557         blp = xfs_dir2_block_leaf_p(btp);
 558         xfs_da_log_buf(tp, bp, (uint)((char *)&blp[first] - (char *)block),
 559                 (uint)((char *)&blp[last + 1] - (char *)block - 1));
 560 }
 561
 562 /*
 563  * Log the block tail.
 564  */
 565 static void
 566 xfs_dir2_block_log_tail(
 567         xfs_trans_t             *tp,            /* transaction structure */
 568         xfs_dabuf_t             *bp)            /* block buffer */
 569 {
 570         xfs_dir2_block_t        *block;         /* directory block structure */
 571         xfs_dir2_block_tail_t   *btp;           /* block tail */
 572         xfs_mount_t             *mp;            /* filesystem mount point */
 573
 574         mp = tp->t_mountp;
 575         block = bp->data;
 576         btp = xfs_dir2_block_tail_p(mp, block);
 577         xfs_da_log_buf(tp, bp, (uint)((char *)btp - (char *)block),
 578                 (uint)((char *)(btp + 1) - (char *)block - 1));
 579 }
 580
 581 /*
 582  * Look up an entry in the block.  This is the external routine,
 583  * xfs_dir2_block_lookup_int does the real work.
 584  */
 585 int                                             /* error */
 586 xfs_dir2_block_lookup(
 587         xfs_da_args_t           *args)          /* dir lookup arguments */
 588 {
 589         xfs_dir2_block_t        *block;         /* block structure */
 590         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 591         xfs_dabuf_t             *bp;            /* block buffer */
 592         xfs_dir2_block_tail_t   *btp;           /* block tail */
 593         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 594         xfs_inode_t             *dp;            /* incore inode */
 595         int                     ent;            /* entry index */
 596         int                     error;          /* error return value */
 597         xfs_mount_t             *mp;            /* filesystem mount point */
 598
 599         xfs_dir2_trace_args("block_lookup", args);
 600         /*
 601          * Get the buffer, look up the entry.
 602          * If not found (ENOENT) then return, have no buffer.
 603          */
 604         if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent)))
 605                 return error;
 606         dp = args->dp;
 607         mp = dp->i_mount;
 608         block = bp->data;
 609         xfs_dir2_data_check(dp, bp);
 610         btp = xfs_dir2_block_tail_p(mp, block);
 611         blp = xfs_dir2_block_leaf_p(btp);
 612         /*
 613          * Get the offset from the leaf entry, to point to the data.
 614          */
 615         dep = (xfs_dir2_data_entry_t *)
 616               ((char *)block + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address)));
 617         /*
 618          * Fill in inode number, release the block.
 619          */
 620         args->inumber = be64_to_cpu(dep->inumber);
 621         xfs_da_brelse(args->trans, bp);
 622         return XFS_ERROR(EEXIST);
 623 }
 624
 625 /*
 626  * Internal block lookup routine.
 627  */
 628 static int                                      /* error */
 629 xfs_dir2_block_lookup_int(
 630         xfs_da_args_t           *args,          /* dir lookup arguments */
 631         xfs_dabuf_t             **bpp,          /* returned block buffer */
 632         int                     *entno)         /* returned entry number */
 633 {
 634         xfs_dir2_dataptr_t      addr;           /* data entry address */
 635         xfs_dir2_block_t        *block;         /* block structure */
 636         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 637         xfs_dabuf_t             *bp;            /* block buffer */
 638         xfs_dir2_block_tail_t   *btp;           /* block tail */
 639         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 640         xfs_inode_t             *dp;            /* incore inode */
 641         int                     error;          /* error return value */
 642         xfs_dahash_t            hash;           /* found hash value */
 643         int                     high;           /* binary search high index */
 644         int                     low;            /* binary search low index */
 645         int                     mid;            /* binary search current idx */
 646         xfs_mount_t             *mp;            /* filesystem mount point */
 647         xfs_trans_t             *tp;            /* transaction pointer */
 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->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, if it's right give back buffer & entry number.
 703                  */
 704                 if (dep->namelen == args->namelen &&
 705                     dep->name[0] == args->name[0] &&
 706                     memcmp(dep->name, args->name, args->namelen) == 0) {
 707                         *bpp = bp;
 708                         *entno = mid;
 709                         return 0;
 710                 }
 711         } while (++mid < be32_to_cpu(btp->count) && be32_to_cpu(blp[mid].hashval) == hash);
 712         /*
 713          * No match, release the buffer and return ENOENT.
 714          */
 715         ASSERT(args->oknoent);
 716         xfs_da_brelse(tp, bp);
 717         return XFS_ERROR(ENOENT);
 718 }
 719
 720 /*
 721  * Remove an entry from a block format directory.
 722  * If that makes the block small enough to fit in shortform, transform it.
 723  */
 724 int                                             /* error */
 725 xfs_dir2_block_removename(
 726         xfs_da_args_t           *args)          /* directory operation args */
 727 {
 728         xfs_dir2_block_t        *block;         /* block structure */
 729         xfs_dir2_leaf_entry_t   *blp;           /* block leaf pointer */
 730         xfs_dabuf_t             *bp;            /* block buffer */
 731         xfs_dir2_block_tail_t   *btp;           /* block tail */
 732         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 733         xfs_inode_t             *dp;            /* incore inode */
 734         int                     ent;            /* block leaf entry index */
 735         int                     error;          /* error return value */
 736         xfs_mount_t             *mp;            /* filesystem mount point */
 737         int                     needlog;        /* need to log block header */
 738         int                     needscan;       /* need to fixup bestfree */
 739         xfs_dir2_sf_hdr_t       sfh;            /* shortform header */
 740         int                     size;           /* shortform size */
 741         xfs_trans_t             *tp;            /* transaction pointer */
 742
 743         xfs_dir2_trace_args("block_removename", args);
 744         /*
 745          * Look up the entry in the block.  Gets the buffer and entry index.
 746          * It will always be there, the vnodeops level does a lookup first.
 747          */
 748         if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
 749                 return error;
 750         }
 751         dp = args->dp;
 752         tp = args->trans;
 753         mp = dp->i_mount;
 754         block = bp->data;
 755         btp = xfs_dir2_block_tail_p(mp, block);
 756         blp = xfs_dir2_block_leaf_p(btp);
 757         /*
 758          * Point to the data entry using the leaf entry.
 759          */
 760         dep = (xfs_dir2_data_entry_t *)
 761               ((char *)block + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address)));
 762         /*
 763          * Mark the data entry's space free.
 764          */
 765         needlog = needscan = 0;
 766         xfs_dir2_data_make_free(tp, bp,
 767                 (xfs_dir2_data_aoff_t)((char *)dep - (char *)block),
 768                 xfs_dir2_data_entsize(dep->namelen), &needlog, &needscan);
 769         /*
 770          * Fix up the block tail.
 771          */
 772         be32_add(&btp->stale, 1);
 773         xfs_dir2_block_log_tail(tp, bp);
 774         /*
 775          * Remove the leaf entry by marking it stale.
 776          */
 777         blp[ent].address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR);
 778         xfs_dir2_block_log_leaf(tp, bp, ent, ent);
 779         /*
 780          * Fix up bestfree, log the header if necessary.
 781          */
 782         if (needscan)
 783                 xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog);
 784         if (needlog)
 785                 xfs_dir2_data_log_header(tp, bp);
 786         xfs_dir2_data_check(dp, bp);
 787         /*
 788          * See if the size as a shortform is good enough.
 789          */
 790         if ((size = xfs_dir2_block_sfsize(dp, block, &sfh)) >
 791             XFS_IFORK_DSIZE(dp)) {
 792                 xfs_da_buf_done(bp);
 793                 return 0;
 794         }
 795         /*
 796          * If it works, do the conversion.
 797          */
 798         return xfs_dir2_block_to_sf(args, bp, size, &sfh);
 799 }
 800
 801 /*
 802  * Replace an entry in a V2 block directory.
 803  * Change the inode number to the new value.
 804  */
 805 int                                             /* error */
 806 xfs_dir2_block_replace(
 807         xfs_da_args_t           *args)          /* directory operation args */
 808 {
 809         xfs_dir2_block_t        *block;         /* block structure */
 810         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 811         xfs_dabuf_t             *bp;            /* block buffer */
 812         xfs_dir2_block_tail_t   *btp;           /* block tail */
 813         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 814         xfs_inode_t             *dp;            /* incore inode */
 815         int                     ent;            /* leaf entry index */
 816         int                     error;          /* error return value */
 817         xfs_mount_t             *mp;            /* filesystem mount point */
 818
 819         xfs_dir2_trace_args("block_replace", args);
 820         /*
 821          * Lookup the entry in the directory.  Get buffer and entry index.
 822          * This will always succeed since the caller has already done a lookup.
 823          */
 824         if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
 825                 return error;
 826         }
 827         dp = args->dp;
 828         mp = dp->i_mount;
 829         block = bp->data;
 830         btp = xfs_dir2_block_tail_p(mp, block);
 831         blp = xfs_dir2_block_leaf_p(btp);
 832         /*
 833          * Point to the data entry we need to change.
 834          */
 835         dep = (xfs_dir2_data_entry_t *)
 836               ((char *)block + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address)));
 837         ASSERT(be64_to_cpu(dep->inumber) != args->inumber);
 838         /*
 839          * Change the inode number to the new value.
 840          */
 841         dep->inumber = cpu_to_be64(args->inumber);
 842         xfs_dir2_data_log_entry(args->trans, bp, dep);
 843         xfs_dir2_data_check(dp, bp);
 844         xfs_da_buf_done(bp);
 845         return 0;
 846 }
 847
 848 /*
 849  * Qsort comparison routine for the block leaf entries.
 850  */
 851 static int                                      /* sort order */
 852 xfs_dir2_block_sort(
 853         const void                      *a,     /* first leaf entry */
 854         const void                      *b)     /* second leaf entry */
 855 {
 856         const xfs_dir2_leaf_entry_t     *la;    /* first leaf entry */
 857         const xfs_dir2_leaf_entry_t     *lb;    /* second leaf entry */
 858
 859         la = a;
 860         lb = b;
 861         return be32_to_cpu(la->hashval) < be32_to_cpu(lb->hashval) ? -1 :
 862                 (be32_to_cpu(la->hashval) > be32_to_cpu(lb->hashval) ? 1 : 0);
 863 }
 864
 865 /*
 866  * Convert a V2 leaf directory to a V2 block directory if possible.
 867  */
 868 int                                             /* error */
 869 xfs_dir2_leaf_to_block(
 870         xfs_da_args_t           *args,          /* operation arguments */
 871         xfs_dabuf_t             *lbp,           /* leaf buffer */
 872         xfs_dabuf_t             *dbp)           /* data buffer */
 873 {
 874         __be16                  *bestsp;        /* leaf bests table */
 875         xfs_dir2_block_t        *block;         /* block structure */
 876         xfs_dir2_block_tail_t   *btp;           /* block tail */
 877         xfs_inode_t             *dp;            /* incore directory inode */
 878         xfs_dir2_data_unused_t  *dup;           /* unused data entry */
 879         int                     error;          /* error return value */
 880         int                     from;           /* leaf from index */
 881         xfs_dir2_leaf_t         *leaf;          /* leaf structure */
 882         xfs_dir2_leaf_entry_t   *lep;           /* leaf entry */
 883         xfs_dir2_leaf_tail_t    *ltp;           /* leaf tail structure */
 884         xfs_mount_t             *mp;            /* file system mount point */
 885         int                     needlog;        /* need to log data header */
 886         int                     needscan;       /* need to scan for bestfree */
 887         xfs_dir2_sf_hdr_t       sfh;            /* shortform header */
 888         int                     size;           /* bytes used */
 889         __be16                  *tagp;          /* end of entry (tag) */
 890         int                     to;             /* block/leaf to index */
 891         xfs_trans_t             *tp;            /* transaction pointer */
 892
 893         xfs_dir2_trace_args_bb("leaf_to_block", args, lbp, dbp);
 894         dp = args->dp;
 895         tp = args->trans;
 896         mp = dp->i_mount;
 897         leaf = lbp->data;
 898         ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAF1_MAGIC);
 899         ltp = xfs_dir2_leaf_tail_p(mp, leaf);
 900         /*
 901          * If there are data blocks other than the first one, take this
 902          * opportunity to remove trailing empty data blocks that may have
 903          * been left behind during no-space-reservation operations.
 904          * These will show up in the leaf bests table.
 905          */
 906         while (dp->i_d.di_size > mp->m_dirblksize) {
 907                 bestsp = xfs_dir2_leaf_bests_p(ltp);
 908                 if (be16_to_cpu(bestsp[be32_to_cpu(ltp->bestcount) - 1]) ==
 909                     mp->m_dirblksize - (uint)sizeof(block->hdr)) {
 910                         if ((error =
 911                             xfs_dir2_leaf_trim_data(args, lbp,
 912                                     (xfs_dir2_db_t)(be32_to_cpu(ltp->bestcount) - 1))))
 913                                 goto out;
 914                 } else {
 915                         error = 0;
 916                         goto out;
 917                 }
 918         }
 919         /*
 920          * Read the data block if we don't already have it, give up if it fails.
 921          */
 922         if (dbp == NULL &&
 923             (error = xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &dbp,
 924                     XFS_DATA_FORK))) {
 925                 goto out;
 926         }
 927         block = dbp->data;
 928         ASSERT(be32_to_cpu(block->hdr.magic) == XFS_DIR2_DATA_MAGIC);
 929         /*
 930          * Size of the "leaf" area in the block.
 931          */
 932         size = (uint)sizeof(block->tail) +
 933                (uint)sizeof(*lep) * (be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale));
 934         /*
 935          * Look at the last data entry.
 936          */
 937         tagp = (__be16 *)((char *)block + mp->m_dirblksize) - 1;
 938         dup = (xfs_dir2_data_unused_t *)((char *)block + be16_to_cpu(*tagp));
 939         /*
 940          * If it's not free or is too short we can't do it.
 941          */
 942         if (be16_to_cpu(dup->freetag) != XFS_DIR2_DATA_FREE_TAG ||
 943             be16_to_cpu(dup->length) < size) {
 944                 error = 0;
 945                 goto out;
 946         }
 947         /*
 948          * Start converting it to block form.
 949          */
 950         block->hdr.magic = cpu_to_be32(XFS_DIR2_BLOCK_MAGIC);
 951         needlog = 1;
 952         needscan = 0;
 953         /*
 954          * Use up the space at the end of the block (blp/btp).
 955          */
 956         xfs_dir2_data_use_free(tp, dbp, dup, mp->m_dirblksize - size, size,
 957                 &needlog, &needscan);
 958         /*
 959          * Initialize the block tail.
 960          */
 961         btp = xfs_dir2_block_tail_p(mp, block);
 962         btp->count = cpu_to_be32(be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale));
 963         btp->stale = 0;
 964         xfs_dir2_block_log_tail(tp, dbp);
 965         /*
 966          * Initialize the block leaf area.  We compact out stale entries.
 967          */
 968         lep = xfs_dir2_block_leaf_p(btp);
 969         for (from = to = 0; from < be16_to_cpu(leaf->hdr.count); from++) {
 970                 if (be32_to_cpu(leaf->ents[from].address) == XFS_DIR2_NULL_DATAPTR)
 971                         continue;
 972                 lep[to++] = leaf->ents[from];
 973         }
 974         ASSERT(to == be32_to_cpu(btp->count));
 975         xfs_dir2_block_log_leaf(tp, dbp, 0, be32_to_cpu(btp->count) - 1);
 976         /*
 977          * Scan the bestfree if we need it and log the data block header.
 978          */
 979         if (needscan)
 980                 xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog);
 981         if (needlog)
 982                 xfs_dir2_data_log_header(tp, dbp);
 983         /*
 984          * Pitch the old leaf block.
 985          */
 986         error = xfs_da_shrink_inode(args, mp->m_dirleafblk, lbp);
 987         lbp = NULL;
 988         if (error) {
 989                 goto out;
 990         }
 991         /*
 992          * Now see if the resulting block can be shrunken to shortform.
 993          */
 994         if ((size = xfs_dir2_block_sfsize(dp, block, &sfh)) >
 995             XFS_IFORK_DSIZE(dp)) {
 996                 error = 0;
 997                 goto out;
 998         }
 999         return xfs_dir2_block_to_sf(args, dbp, size, &sfh);
1000 out:
1001         if (lbp)
1002                 xfs_da_buf_done(lbp);
1003         if (dbp)
1004                 xfs_da_buf_done(dbp);
1005         return error;
1006 }
1007
1008 /*
1009  * Convert the shortform directory to block form.
1010  */
1011 int                                             /* error */
1012 xfs_dir2_sf_to_block(
1013         xfs_da_args_t           *args)          /* operation arguments */
1014 {
1015         xfs_dir2_db_t           blkno;          /* dir-relative block # (0) */
1016         xfs_dir2_block_t        *block;         /* block structure */
1017         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
1018         xfs_dabuf_t             *bp;            /* block buffer */
1019         xfs_dir2_block_tail_t   *btp;           /* block tail pointer */
1020         char                    *buf;           /* sf buffer */
1021         int                     buf_len;
1022         xfs_dir2_data_entry_t   *dep;           /* data entry pointer */
1023         xfs_inode_t             *dp;            /* incore directory inode */
1024         int                     dummy;          /* trash */
1025         xfs_dir2_data_unused_t  *dup;           /* unused entry pointer */
1026         int                     endoffset;      /* end of data objects */
1027         int                     error;          /* error return value */
1028         int                     i;              /* index */
1029         xfs_mount_t             *mp;            /* filesystem mount point */
1030         int                     needlog;        /* need to log block header */
1031         int                     needscan;       /* need to scan block freespc */
1032         int                     newoffset;      /* offset from current entry */
1033         int                     offset;         /* target block offset */
1034         xfs_dir2_sf_entry_t     *sfep;          /* sf entry pointer */
1035         xfs_dir2_sf_t           *sfp;           /* shortform structure */
1036         __be16                  *tagp;          /* end of data entry */
1037         xfs_trans_t             *tp;            /* transaction pointer */
1038
1039         xfs_dir2_trace_args("sf_to_block", args);
1040         dp = args->dp;
1041         tp = args->trans;
1042         mp = dp->i_mount;
1043         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
1044         /*
1045          * Bomb out if the shortform directory is way too short.
1046          */
1047         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
1048                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1049                 return XFS_ERROR(EIO);
1050         }
1051         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
1052         ASSERT(dp->i_df.if_u1.if_data != NULL);
1053         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1054         ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
1055         /*
1056          * Copy the directory into the stack buffer.
1057          * Then pitch the incore inode data so we can make extents.
1058          */
1059
1060         buf_len = dp->i_df.if_bytes;
1061         buf = kmem_alloc(dp->i_df.if_bytes, KM_SLEEP);
1062
1063         memcpy(buf, sfp, dp->i_df.if_bytes);
1064         xfs_idata_realloc(dp, -dp->i_df.if_bytes, XFS_DATA_FORK);
1065         dp->i_d.di_size = 0;
1066         xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1067         /*
1068          * Reset pointer - old sfp is gone.
1069          */
1070         sfp = (xfs_dir2_sf_t *)buf;
1071         /*
1072          * Add block 0 to the inode.
1073          */
1074         error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE, &blkno);
1075         if (error) {
1076                 kmem_free(buf, buf_len);
1077                 return error;
1078         }
1079         /*
1080          * Initialize the data block.
1081          */
1082         error = xfs_dir2_data_init(args, blkno, &bp);
1083         if (error) {
1084                 kmem_free(buf, buf_len);
1085                 return error;
1086         }
1087         block = bp->data;
1088         block->hdr.magic = cpu_to_be32(XFS_DIR2_BLOCK_MAGIC);
1089         /*
1090          * Compute size of block "tail" area.
1091          */
1092         i = (uint)sizeof(*btp) +
1093             (sfp->hdr.count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t);
1094         /*
1095          * The whole thing is initialized to free by the init routine.
1096          * Say we're using the leaf and tail area.
1097          */
1098         dup = (xfs_dir2_data_unused_t *)block->u;
1099         needlog = needscan = 0;
1100         xfs_dir2_data_use_free(tp, bp, dup, mp->m_dirblksize - i, i, &needlog,
1101                 &needscan);
1102         ASSERT(needscan == 0);
1103         /*
1104          * Fill in the tail.
1105          */
1106         btp = xfs_dir2_block_tail_p(mp, block);
1107         btp->count = cpu_to_be32(sfp->hdr.count + 2);   /* ., .. */
1108         btp->stale = 0;
1109         blp = xfs_dir2_block_leaf_p(btp);
1110         endoffset = (uint)((char *)blp - (char *)block);
1111         /*
1112          * Remove the freespace, we'll manage it.
1113          */
1114         xfs_dir2_data_use_free(tp, bp, dup,
1115                 (xfs_dir2_data_aoff_t)((char *)dup - (char *)block),
1116                 be16_to_cpu(dup->length), &needlog, &needscan);
1117         /*
1118          * Create entry for .
1119          */
1120         dep = (xfs_dir2_data_entry_t *)
1121               ((char *)block + XFS_DIR2_DATA_DOT_OFFSET);
1122         dep->inumber = cpu_to_be64(dp->i_ino);
1123         dep->namelen = 1;
1124         dep->name[0] = '.';
1125         tagp = xfs_dir2_data_entry_tag_p(dep);
1126         *tagp = cpu_to_be16((char *)dep - (char *)block);
1127         xfs_dir2_data_log_entry(tp, bp, dep);
1128         blp[0].hashval = cpu_to_be32(xfs_dir_hash_dot);
1129         blp[0].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,
1130                                 (char *)dep - (char *)block));
1131         /*
1132          * Create entry for ..
1133          */
1134         dep = (xfs_dir2_data_entry_t *)
1135                 ((char *)block + XFS_DIR2_DATA_DOTDOT_OFFSET);
1136         dep->inumber = cpu_to_be64(xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent));
1137         dep->namelen = 2;
1138         dep->name[0] = dep->name[1] = '.';
1139         tagp = xfs_dir2_data_entry_tag_p(dep);
1140         *tagp = cpu_to_be16((char *)dep - (char *)block);
1141         xfs_dir2_data_log_entry(tp, bp, dep);
1142         blp[1].hashval = cpu_to_be32(xfs_dir_hash_dotdot);
1143         blp[1].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,
1144                                 (char *)dep - (char *)block));
1145         offset = XFS_DIR2_DATA_FIRST_OFFSET;
1146         /*
1147          * Loop over existing entries, stuff them in.
1148          */
1149         if ((i = 0) == sfp->hdr.count)
1150                 sfep = NULL;
1151         else
1152                 sfep = xfs_dir2_sf_firstentry(sfp);
1153         /*
1154          * Need to preserve the existing offset values in the sf directory.
1155          * Insert holes (unused entries) where necessary.
1156          */
1157         while (offset < endoffset) {
1158                 /*
1159                  * sfep is null when we reach the end of the list.
1160                  */
1161                 if (sfep == NULL)
1162                         newoffset = endoffset;
1163                 else
1164                         newoffset = xfs_dir2_sf_get_offset(sfep);
1165                 /*
1166                  * There should be a hole here, make one.
1167                  */
1168                 if (offset < newoffset) {
1169                         dup = (xfs_dir2_data_unused_t *)
1170                               ((char *)block + offset);
1171                         dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
1172                         dup->length = cpu_to_be16(newoffset - offset);
1173                         *xfs_dir2_data_unused_tag_p(dup) = cpu_to_be16(
1174                                 ((char *)dup - (char *)block));
1175                         xfs_dir2_data_log_unused(tp, bp, dup);
1176                         (void)xfs_dir2_data_freeinsert((xfs_dir2_data_t *)block,
1177                                 dup, &dummy);
1178                         offset += be16_to_cpu(dup->length);
1179                         continue;
1180                 }
1181                 /*
1182                  * Copy a real entry.
1183                  */
1184                 dep = (xfs_dir2_data_entry_t *)((char *)block + newoffset);
1185                 dep->inumber = cpu_to_be64(xfs_dir2_sf_get_inumber(sfp,
1186                                 xfs_dir2_sf_inumberp(sfep)));
1187                 dep->namelen = sfep->namelen;
1188                 memcpy(dep->name, sfep->name, dep->namelen);
1189                 tagp = xfs_dir2_data_entry_tag_p(dep);
1190                 *tagp = cpu_to_be16((char *)dep - (char *)block);
1191                 xfs_dir2_data_log_entry(tp, bp, dep);
1192                 blp[2 + i].hashval = cpu_to_be32(xfs_da_hashname(
1193                                         (char *)sfep->name, sfep->namelen));
1194                 blp[2 + i].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,
1195                                                  (char *)dep - (char *)block));
1196                 offset = (int)((char *)(tagp + 1) - (char *)block);
1197                 if (++i == sfp->hdr.count)
1198                         sfep = NULL;
1199                 else
1200                         sfep = xfs_dir2_sf_nextentry(sfp, sfep);
1201         }
1202         /* Done with the temporary buffer */
1203         kmem_free(buf, buf_len);
1204         /*
1205          * Sort the leaf entries by hash value.
1206          */
1207         xfs_sort(blp, be32_to_cpu(btp->count), sizeof(*blp), xfs_dir2_block_sort);
1208         /*
1209          * Log the leaf entry area and tail.
1210          * Already logged the header in data_init, ignore needlog.
1211          */
1212         ASSERT(needscan == 0);
1213         xfs_dir2_block_log_leaf(tp, bp, 0, be32_to_cpu(btp->count) - 1);
1214         xfs_dir2_block_log_tail(tp, bp);
1215         xfs_dir2_data_check(dp, bp);
1216         xfs_da_buf_done(bp);
1217         return 0;
1218 }