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_dir2.h"
  26 #include "xfs_dmapi.h"
  27 #include "xfs_mount.h"
  28 #include "xfs_da_btree.h"
  29 #include "xfs_bmap_btree.h"
  30 #include "xfs_dir2_sf.h"
  31 #include "xfs_attr_sf.h"
  32 #include "xfs_dinode.h"
  33 #include "xfs_inode.h"
  34 #include "xfs_inode_item.h"
  35 #include "xfs_dir2_data.h"
  36 #include "xfs_dir2_leaf.h"
  37 #include "xfs_dir2_block.h"
  38 #include "xfs_dir2_trace.h"
  39 #include "xfs_error.h"
  40
  41 /*
  42  * Local function prototypes.
  43  */
  44 static void xfs_dir2_block_log_leaf(xfs_trans_t *tp, xfs_dabuf_t *bp, int first,
  45                                     int last);
  46 static void xfs_dir2_block_log_tail(xfs_trans_t *tp, xfs_dabuf_t *bp);
  47 static int xfs_dir2_block_lookup_int(xfs_da_args_t *args, xfs_dabuf_t **bpp,
  48                                      int *entno);
  49 static int xfs_dir2_block_sort(const void *a, const void *b);
  50
  51 static xfs_dahash_t xfs_dir_hash_dot, xfs_dir_hash_dotdot;
  52
  53 /*
  54  * One-time startup routine called from xfs_init().
  55  */
  56 void
  57 xfs_dir_startup(void)
  58 {
  59         xfs_dir_hash_dot = xfs_da_hashname(".", 1);
  60         xfs_dir_hash_dotdot = xfs_da_hashname("..", 2);
  61 }
  62
  63 /*
  64  * Add an entry to a block directory.
  65  */
  66 int                                             /* error */
  67 xfs_dir2_block_addname(
  68         xfs_da_args_t           *args)          /* directory op arguments */
  69 {
  70         xfs_dir2_data_free_t    *bf;            /* bestfree table in block */
  71         xfs_dir2_block_t        *block;         /* directory block structure */
  72         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
  73         xfs_dabuf_t             *bp;            /* buffer for block */
  74         xfs_dir2_block_tail_t   *btp;           /* block tail */
  75         int                     compact;        /* need to compact leaf ents */
  76         xfs_dir2_data_entry_t   *dep;           /* block data entry */
  77         xfs_inode_t             *dp;            /* directory inode */
  78         xfs_dir2_data_unused_t  *dup;           /* block unused entry */
  79         int                     error;          /* error return value */
  80         xfs_dir2_data_unused_t  *enddup=NULL;   /* unused at end of data */
  81         xfs_dahash_t            hash;           /* hash value of found entry */
  82         int                     high;           /* high index for binary srch */
  83         int                     highstale;      /* high stale index */
  84         int                     lfloghigh=0;    /* last final leaf to log */
  85         int                     lfloglow=0;     /* first final leaf to log */
  86         int                     len;            /* length of the new entry */
  87         int                     low;            /* low index for binary srch */
  88         int                     lowstale;       /* low stale index */
  89         int                     mid=0;          /* midpoint for binary srch */
  90         xfs_mount_t             *mp;            /* filesystem mount point */
  91         int                     needlog;        /* need to log header */
  92         int                     needscan;       /* need to rescan freespace */
  93         __be16                  *tagp;          /* pointer to tag value */
  94         xfs_trans_t             *tp;            /* transaction structure */
  95
  96         xfs_dir2_trace_args("block_addname", args);
  97         dp = args->dp;
  98         tp = args->trans;
  99         mp = dp->i_mount;
 100         /*
 101          * Read the (one and only) directory block into dabuf bp.
 102          */
 103         if ((error =
 104             xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
 105                 return error;
 106         }
 107         ASSERT(bp != NULL);
 108         block = bp->data;
 109         /*
 110          * Check the magic number, corrupted if wrong.
 111          */
 112         if (unlikely(be32_to_cpu(block->hdr.magic) != XFS_DIR2_BLOCK_MAGIC)) {
 113                 XFS_CORRUPTION_ERROR("xfs_dir2_block_addname",
 114                                      XFS_ERRLEVEL_LOW, mp, block);
 115                 xfs_da_brelse(tp, bp);
 116                 return XFS_ERROR(EFSCORRUPTED);
 117         }
 118         len = XFS_DIR2_DATA_ENTSIZE(args->namelen);
 119         /*
 120          * Set up pointers to parts of the block.
 121          */
 122         bf = block->hdr.bestfree;
 123         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 124         blp = XFS_DIR2_BLOCK_LEAF_P(btp);
 125         /*
 126          * No stale entries?  Need space for entry and new leaf.
 127          */
 128         if (!btp->stale) {
 129                 /*
 130                  * Tag just before the first leaf entry.
 131                  */
 132                 tagp = (__be16 *)blp - 1;
 133                 /*
 134                  * Data object just before the first leaf entry.
 135                  */
 136                 enddup = (xfs_dir2_data_unused_t *)((char *)block + be16_to_cpu(*tagp));
 137                 /*
 138                  * If it's not free then can't do this add without cleaning up:
 139                  * the space before the first leaf entry needs to be free so it
 140                  * can be expanded to hold the pointer to the new entry.
 141                  */
 142                 if (be16_to_cpu(enddup->freetag) != XFS_DIR2_DATA_FREE_TAG)
 143                         dup = enddup = NULL;
 144                 /*
 145                  * Check out the biggest freespace and see if it's the same one.
 146                  */
 147                 else {
 148                         dup = (xfs_dir2_data_unused_t *)
 149                               ((char *)block + be16_to_cpu(bf[0].offset));
 150                         if (dup == enddup) {
 151                                 /*
 152                                  * It is the biggest freespace, is it too small
 153                                  * to hold the new leaf too?
 154                                  */
 155                                 if (be16_to_cpu(dup->length) < len + (uint)sizeof(*blp)) {
 156                                         /*
 157                                          * Yes, we use the second-largest
 158                                          * entry instead if it works.
 159                                          */
 160                                         if (be16_to_cpu(bf[1].length) >= len)
 161                                                 dup = (xfs_dir2_data_unused_t *)
 162                                                       ((char *)block +
 163                                                        be16_to_cpu(bf[1].offset));
 164                                         else
 165                                                 dup = NULL;
 166                                 }
 167                         } else {
 168                                 /*
 169                                  * Not the same free entry,
 170                                  * just check its length.
 171                                  */
 172                                 if (be16_to_cpu(dup->length) < len) {
 173                                         dup = NULL;
 174                                 }
 175                         }
 176                 }
 177                 compact = 0;
 178         }
 179         /*
 180          * If there are stale entries we'll use one for the leaf.
 181          * Is the biggest entry enough to avoid compaction?
 182          */
 183         else if (be16_to_cpu(bf[0].length) >= len) {
 184                 dup = (xfs_dir2_data_unused_t *)
 185                       ((char *)block + be16_to_cpu(bf[0].offset));
 186                 compact = 0;
 187         }
 188         /*
 189          * Will need to compact to make this work.
 190          */
 191         else {
 192                 /*
 193                  * Tag just before the first leaf entry.
 194                  */
 195                 tagp = (__be16 *)blp - 1;
 196                 /*
 197                  * Data object just before the first leaf entry.
 198                  */
 199                 dup = (xfs_dir2_data_unused_t *)((char *)block + be16_to_cpu(*tagp));
 200                 /*
 201                  * If it's not free then the data will go where the
 202                  * leaf data starts now, if it works at all.
 203                  */
 204                 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
 205                         if (be16_to_cpu(dup->length) + (be32_to_cpu(btp->stale) - 1) *
 206                             (uint)sizeof(*blp) < len)
 207                                 dup = NULL;
 208                 } else if ((be32_to_cpu(btp->stale) - 1) * (uint)sizeof(*blp) < len)
 209                         dup = NULL;
 210                 else
 211                         dup = (xfs_dir2_data_unused_t *)blp;
 212                 compact = 1;
 213         }
 214         /*
 215          * If this isn't a real add, we're done with the buffer.
 216          */
 217         if (args->justcheck)
 218                 xfs_da_brelse(tp, bp);
 219         /*
 220          * If we don't have space for the new entry & leaf ...
 221          */
 222         if (!dup) {
 223                 /*
 224                  * Not trying to actually do anything, or don't have
 225                  * a space reservation: return no-space.
 226                  */
 227                 if (args->justcheck || args->total == 0)
 228                         return XFS_ERROR(ENOSPC);
 229                 /*
 230                  * Convert to the next larger format.
 231                  * Then add the new entry in that format.
 232                  */
 233                 error = xfs_dir2_block_to_leaf(args, bp);
 234                 xfs_da_buf_done(bp);
 235                 if (error)
 236                         return error;
 237                 return xfs_dir2_leaf_addname(args);
 238         }
 239         /*
 240          * Just checking, and it would work, so say so.
 241          */
 242         if (args->justcheck)
 243                 return 0;
 244         needlog = needscan = 0;
 245         /*
 246          * If need to compact the leaf entries, do it now.
 247          * Leave the highest-numbered stale entry stale.
 248          * XXX should be the one closest to mid but mid is not yet computed.
 249          */
 250         if (compact) {
 251                 int     fromidx;                /* source leaf index */
 252                 int     toidx;                  /* target leaf index */
 253
 254                 for (fromidx = toidx = be32_to_cpu(btp->count) - 1,
 255                         highstale = lfloghigh = -1;
 256                      fromidx >= 0;
 257                      fromidx--) {
 258                         if (be32_to_cpu(blp[fromidx].address) == XFS_DIR2_NULL_DATAPTR) {
 259                                 if (highstale == -1)
 260                                         highstale = toidx;
 261                                 else {
 262                                         if (lfloghigh == -1)
 263                                                 lfloghigh = toidx;
 264                                         continue;
 265                                 }
 266                         }
 267                         if (fromidx < toidx)
 268                                 blp[toidx] = blp[fromidx];
 269                         toidx--;
 270                 }
 271                 lfloglow = toidx + 1 - (be32_to_cpu(btp->stale) - 1);
 272                 lfloghigh -= be32_to_cpu(btp->stale) - 1;
 273                 be32_add(&btp->count, -(be32_to_cpu(btp->stale) - 1));
 274                 xfs_dir2_data_make_free(tp, bp,
 275                         (xfs_dir2_data_aoff_t)((char *)blp - (char *)block),
 276                         (xfs_dir2_data_aoff_t)((be32_to_cpu(btp->stale) - 1) * sizeof(*blp)),
 277                         &needlog, &needscan);
 278                 blp += be32_to_cpu(btp->stale) - 1;
 279                 btp->stale = cpu_to_be32(1);
 280                 /*
 281                  * If we now need to rebuild the bestfree map, do so.
 282                  * This needs to happen before the next call to use_free.
 283                  */
 284                 if (needscan) {
 285                         xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block,
 286                                 &needlog, NULL);
 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, NULL);
 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                         NULL);
 423         if (needlog)
 424                 xfs_dir2_data_log_header(tp, bp);
 425         xfs_dir2_block_log_tail(tp, bp);
 426         xfs_dir2_data_log_entry(tp, bp, dep);
 427         xfs_dir2_data_check(dp, bp);
 428         xfs_da_buf_done(bp);
 429         return 0;
 430 }
 431
 432 /*
 433  * Readdir for block directories.
 434  */
 435 int                                             /* error */
 436 xfs_dir2_block_getdents(
 437         xfs_trans_t             *tp,            /* transaction (NULL) */
 438         xfs_inode_t             *dp,            /* incore inode */
 439         uio_t                   *uio,           /* caller's buffer control */
 440         int                     *eofp,          /* eof reached? (out) */
 441         xfs_dirent_t            *dbp,           /* caller's buffer */
 442         xfs_dir2_put_t          put)            /* abi's formatting function */
 443 {
 444         xfs_dir2_block_t        *block;         /* directory block structure */
 445         xfs_dabuf_t             *bp;            /* buffer for block */
 446         xfs_dir2_block_tail_t   *btp;           /* block tail */
 447         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 448         xfs_dir2_data_unused_t  *dup;           /* block unused entry */
 449         char                    *endptr;        /* end of the data entries */
 450         int                     error;          /* error return value */
 451         xfs_mount_t             *mp;            /* filesystem mount point */
 452         xfs_dir2_put_args_t     p;              /* arg package for put rtn */
 453         char                    *ptr;           /* current data entry */
 454         int                     wantoff;        /* starting block offset */
 455
 456         mp = dp->i_mount;
 457         /*
 458          * If the block number in the offset is out of range, we're done.
 459          */
 460         if (XFS_DIR2_DATAPTR_TO_DB(mp, uio->uio_offset) > mp->m_dirdatablk) {
 461                 *eofp = 1;
 462                 return 0;
 463         }
 464         /*
 465          * Can't read the block, give up, else get dabuf in bp.
 466          */
 467         if ((error =
 468             xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
 469                 return error;
 470         }
 471         ASSERT(bp != NULL);
 472         /*
 473          * Extract the byte offset we start at from the seek pointer.
 474          * We'll skip entries before this.
 475          */
 476         wantoff = XFS_DIR2_DATAPTR_TO_OFF(mp, uio->uio_offset);
 477         block = bp->data;
 478         xfs_dir2_data_check(dp, bp);
 479         /*
 480          * Set up values for the loop.
 481          */
 482         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 483         ptr = (char *)block->u;
 484         endptr = (char *)XFS_DIR2_BLOCK_LEAF_P(btp);
 485         p.dbp = dbp;
 486         p.put = put;
 487         p.uio = uio;
 488         /*
 489          * Loop over the data portion of the block.
 490          * Each object is a real entry (dep) or an unused one (dup).
 491          */
 492         while (ptr < endptr) {
 493                 dup = (xfs_dir2_data_unused_t *)ptr;
 494                 /*
 495                  * Unused, skip it.
 496                  */
 497                 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
 498                         ptr += be16_to_cpu(dup->length);
 499                         continue;
 500                 }
 501
 502                 dep = (xfs_dir2_data_entry_t *)ptr;
 503
 504                 /*
 505                  * Bump pointer for the next iteration.
 506                  */
 507                 ptr += XFS_DIR2_DATA_ENTSIZE(dep->namelen);
 508                 /*
 509                  * The entry is before the desired starting point, skip it.
 510                  */
 511                 if ((char *)dep - (char *)block < wantoff)
 512                         continue;
 513                 /*
 514                  * Set up argument structure for put routine.
 515                  */
 516                 p.namelen = dep->namelen;
 517
 518                 p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 519                                                     ptr - (char *)block);
 520                 p.ino = be64_to_cpu(dep->inumber);
 521 #if XFS_BIG_INUMS
 522                 p.ino += mp->m_inoadd;
 523 #endif
 524                 p.name = (char *)dep->name;
 525
 526                 /*
 527                  * Put the entry in the caller's buffer.
 528                  */
 529                 error = p.put(&p);
 530
 531                 /*
 532                  * If it didn't fit, set the final offset to here & return.
 533                  */
 534                 if (!p.done) {
 535                         uio->uio_offset =
 536                                 XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 537                                         (char *)dep - (char *)block);
 538                         xfs_da_brelse(tp, bp);
 539                         return error;
 540                 }
 541         }
 542
 543         /*
 544          * Reached the end of the block.
 545          * Set the offset to a non-existent block 1 and return.
 546          */
 547         *eofp = 1;
 548
 549         uio->uio_offset =
 550                 XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk + 1, 0);
 551
 552         xfs_da_brelse(tp, bp);
 553
 554         return 0;
 555 }
 556
 557 /*
 558  * Log leaf entries from the block.
 559  */
 560 static void
 561 xfs_dir2_block_log_leaf(
 562         xfs_trans_t             *tp,            /* transaction structure */
 563         xfs_dabuf_t             *bp,            /* block buffer */
 564         int                     first,          /* index of first logged leaf */
 565         int                     last)           /* index of last logged leaf */
 566 {
 567         xfs_dir2_block_t        *block;         /* directory block structure */
 568         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 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         blp = XFS_DIR2_BLOCK_LEAF_P(btp);
 576         xfs_da_log_buf(tp, bp, (uint)((char *)&blp[first] - (char *)block),
 577                 (uint)((char *)&blp[last + 1] - (char *)block - 1));
 578 }
 579
 580 /*
 581  * Log the block tail.
 582  */
 583 static void
 584 xfs_dir2_block_log_tail(
 585         xfs_trans_t             *tp,            /* transaction structure */
 586         xfs_dabuf_t             *bp)            /* block buffer */
 587 {
 588         xfs_dir2_block_t        *block;         /* directory block structure */
 589         xfs_dir2_block_tail_t   *btp;           /* block tail */
 590         xfs_mount_t             *mp;            /* filesystem mount point */
 591
 592         mp = tp->t_mountp;
 593         block = bp->data;
 594         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 595         xfs_da_log_buf(tp, bp, (uint)((char *)btp - (char *)block),
 596                 (uint)((char *)(btp + 1) - (char *)block - 1));
 597 }
 598
 599 /*
 600  * Look up an entry in the block.  This is the external routine,
 601  * xfs_dir2_block_lookup_int does the real work.
 602  */
 603 int                                             /* error */
 604 xfs_dir2_block_lookup(
 605         xfs_da_args_t           *args)          /* dir lookup arguments */
 606 {
 607         xfs_dir2_block_t        *block;         /* block structure */
 608         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 609         xfs_dabuf_t             *bp;            /* block buffer */
 610         xfs_dir2_block_tail_t   *btp;           /* block tail */
 611         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 612         xfs_inode_t             *dp;            /* incore inode */
 613         int                     ent;            /* entry index */
 614         int                     error;          /* error return value */
 615         xfs_mount_t             *mp;            /* filesystem mount point */
 616
 617         xfs_dir2_trace_args("block_lookup", args);
 618         /*
 619          * Get the buffer, look up the entry.
 620          * If not found (ENOENT) then return, have no buffer.
 621          */
 622         if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent)))
 623                 return error;
 624         dp = args->dp;
 625         mp = dp->i_mount;
 626         block = bp->data;
 627         xfs_dir2_data_check(dp, bp);
 628         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 629         blp = XFS_DIR2_BLOCK_LEAF_P(btp);
 630         /*
 631          * Get the offset from the leaf entry, to point to the data.
 632          */
 633         dep = (xfs_dir2_data_entry_t *)
 634               ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, be32_to_cpu(blp[ent].address)));
 635         /*
 636          * Fill in inode number, release the block.
 637          */
 638         args->inumber = be64_to_cpu(dep->inumber);
 639         xfs_da_brelse(args->trans, bp);
 640         return XFS_ERROR(EEXIST);
 641 }
 642
 643 /*
 644  * Internal block lookup routine.
 645  */
 646 static int                                      /* error */
 647 xfs_dir2_block_lookup_int(
 648         xfs_da_args_t           *args,          /* dir lookup arguments */
 649         xfs_dabuf_t             **bpp,          /* returned block buffer */
 650         int                     *entno)         /* returned entry number */
 651 {
 652         xfs_dir2_dataptr_t      addr;           /* data entry address */
 653         xfs_dir2_block_t        *block;         /* block structure */
 654         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 655         xfs_dabuf_t             *bp;            /* block buffer */
 656         xfs_dir2_block_tail_t   *btp;           /* block tail */
 657         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 658         xfs_inode_t             *dp;            /* incore inode */
 659         int                     error;          /* error return value */
 660         xfs_dahash_t            hash;           /* found hash value */
 661         int                     high;           /* binary search high index */
 662         int                     low;            /* binary search low index */
 663         int                     mid;            /* binary search current idx */
 664         xfs_mount_t             *mp;            /* filesystem mount point */
 665         xfs_trans_t             *tp;            /* transaction pointer */
 666
 667         dp = args->dp;
 668         tp = args->trans;
 669         mp = dp->i_mount;
 670         /*
 671          * Read the buffer, return error if we can't get it.
 672          */
 673         if ((error =
 674             xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
 675                 return error;
 676         }
 677         ASSERT(bp != NULL);
 678         block = bp->data;
 679         xfs_dir2_data_check(dp, bp);
 680         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 681         blp = XFS_DIR2_BLOCK_LEAF_P(btp);
 682         /*
 683          * Loop doing a binary search for our hash value.
 684          * Find our entry, ENOENT if it's not there.
 685          */
 686         for (low = 0, high = be32_to_cpu(btp->count) - 1; ; ) {
 687                 ASSERT(low <= high);
 688                 mid = (low + high) >> 1;
 689                 if ((hash = be32_to_cpu(blp[mid].hashval)) == args->hashval)
 690                         break;
 691                 if (hash < args->hashval)
 692                         low = mid + 1;
 693                 else
 694                         high = mid - 1;
 695                 if (low > high) {
 696                         ASSERT(args->oknoent);
 697                         xfs_da_brelse(tp, bp);
 698                         return XFS_ERROR(ENOENT);
 699                 }
 700         }
 701         /*
 702          * Back up to the first one with the right hash value.
 703          */
 704         while (mid > 0 && be32_to_cpu(blp[mid - 1].hashval) == args->hashval) {
 705                 mid--;
 706         }
 707         /*
 708          * Now loop forward through all the entries with the
 709          * right hash value looking for our name.
 710          */
 711         do {
 712                 if ((addr = be32_to_cpu(blp[mid].address)) == XFS_DIR2_NULL_DATAPTR)
 713                         continue;
 714                 /*
 715                  * Get pointer to the entry from the leaf.
 716                  */
 717                 dep = (xfs_dir2_data_entry_t *)
 718                         ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, addr));
 719                 /*
 720                  * Compare, if it's right give back buffer & entry number.
 721                  */
 722                 if (dep->namelen == args->namelen &&
 723                     dep->name[0] == args->name[0] &&
 724                     memcmp(dep->name, args->name, args->namelen) == 0) {
 725                         *bpp = bp;
 726                         *entno = mid;
 727                         return 0;
 728                 }
 729         } while (++mid < be32_to_cpu(btp->count) && be32_to_cpu(blp[mid].hashval) == hash);
 730         /*
 731          * No match, release the buffer and return ENOENT.
 732          */
 733         ASSERT(args->oknoent);
 734         xfs_da_brelse(tp, bp);
 735         return XFS_ERROR(ENOENT);
 736 }
 737
 738 /*
 739  * Remove an entry from a block format directory.
 740  * If that makes the block small enough to fit in shortform, transform it.
 741  */
 742 int                                             /* error */
 743 xfs_dir2_block_removename(
 744         xfs_da_args_t           *args)          /* directory operation args */
 745 {
 746         xfs_dir2_block_t        *block;         /* block structure */
 747         xfs_dir2_leaf_entry_t   *blp;           /* block leaf pointer */
 748         xfs_dabuf_t             *bp;            /* block buffer */
 749         xfs_dir2_block_tail_t   *btp;           /* block tail */
 750         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 751         xfs_inode_t             *dp;            /* incore inode */
 752         int                     ent;            /* block leaf entry index */
 753         int                     error;          /* error return value */
 754         xfs_mount_t             *mp;            /* filesystem mount point */
 755         int                     needlog;        /* need to log block header */
 756         int                     needscan;       /* need to fixup bestfree */
 757         xfs_dir2_sf_hdr_t       sfh;            /* shortform header */
 758         int                     size;           /* shortform size */
 759         xfs_trans_t             *tp;            /* transaction pointer */
 760
 761         xfs_dir2_trace_args("block_removename", args);
 762         /*
 763          * Look up the entry in the block.  Gets the buffer and entry index.
 764          * It will always be there, the vnodeops level does a lookup first.
 765          */
 766         if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
 767                 return error;
 768         }
 769         dp = args->dp;
 770         tp = args->trans;
 771         mp = dp->i_mount;
 772         block = bp->data;
 773         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 774         blp = XFS_DIR2_BLOCK_LEAF_P(btp);
 775         /*
 776          * Point to the data entry using the leaf entry.
 777          */
 778         dep = (xfs_dir2_data_entry_t *)
 779               ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, be32_to_cpu(blp[ent].address)));
 780         /*
 781          * Mark the data entry's space free.
 782          */
 783         needlog = needscan = 0;
 784         xfs_dir2_data_make_free(tp, bp,
 785                 (xfs_dir2_data_aoff_t)((char *)dep - (char *)block),
 786                 XFS_DIR2_DATA_ENTSIZE(dep->namelen), &needlog, &needscan);
 787         /*
 788          * Fix up the block tail.
 789          */
 790         be32_add(&btp->stale, 1);
 791         xfs_dir2_block_log_tail(tp, bp);
 792         /*
 793          * Remove the leaf entry by marking it stale.
 794          */
 795         blp[ent].address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR);
 796         xfs_dir2_block_log_leaf(tp, bp, ent, ent);
 797         /*
 798          * Fix up bestfree, log the header if necessary.
 799          */
 800         if (needscan)
 801                 xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog,
 802                         NULL);
 803         if (needlog)
 804                 xfs_dir2_data_log_header(tp, bp);
 805         xfs_dir2_data_check(dp, bp);
 806         /*
 807          * See if the size as a shortform is good enough.
 808          */
 809         if ((size = xfs_dir2_block_sfsize(dp, block, &sfh)) >
 810             XFS_IFORK_DSIZE(dp)) {
 811                 xfs_da_buf_done(bp);
 812                 return 0;
 813         }
 814         /*
 815          * If it works, do the conversion.
 816          */
 817         return xfs_dir2_block_to_sf(args, bp, size, &sfh);
 818 }
 819
 820 /*
 821  * Replace an entry in a V2 block directory.
 822  * Change the inode number to the new value.
 823  */
 824 int                                             /* error */
 825 xfs_dir2_block_replace(
 826         xfs_da_args_t           *args)          /* directory operation args */
 827 {
 828         xfs_dir2_block_t        *block;         /* block structure */
 829         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 830         xfs_dabuf_t             *bp;            /* block buffer */
 831         xfs_dir2_block_tail_t   *btp;           /* block tail */
 832         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 833         xfs_inode_t             *dp;            /* incore inode */
 834         int                     ent;            /* leaf entry index */
 835         int                     error;          /* error return value */
 836         xfs_mount_t             *mp;            /* filesystem mount point */
 837
 838         xfs_dir2_trace_args("block_replace", args);
 839         /*
 840          * Lookup the entry in the directory.  Get buffer and entry index.
 841          * This will always succeed since the caller has already done a lookup.
 842          */
 843         if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
 844                 return error;
 845         }
 846         dp = args->dp;
 847         mp = dp->i_mount;
 848         block = bp->data;
 849         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 850         blp = XFS_DIR2_BLOCK_LEAF_P(btp);
 851         /*
 852          * Point to the data entry we need to change.
 853          */
 854         dep = (xfs_dir2_data_entry_t *)
 855               ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, be32_to_cpu(blp[ent].address)));
 856         ASSERT(be64_to_cpu(dep->inumber) != args->inumber);
 857         /*
 858          * Change the inode number to the new value.
 859          */
 860         dep->inumber = cpu_to_be64(args->inumber);
 861         xfs_dir2_data_log_entry(args->trans, bp, dep);
 862         xfs_dir2_data_check(dp, bp);
 863         xfs_da_buf_done(bp);
 864         return 0;
 865 }
 866
 867 /*
 868  * Qsort comparison routine for the block leaf entries.
 869  */
 870 static int                                      /* sort order */
 871 xfs_dir2_block_sort(
 872         const void                      *a,     /* first leaf entry */
 873         const void                      *b)     /* second leaf entry */
 874 {
 875         const xfs_dir2_leaf_entry_t     *la;    /* first leaf entry */
 876         const xfs_dir2_leaf_entry_t     *lb;    /* second leaf entry */
 877
 878         la = a;
 879         lb = b;
 880         return be32_to_cpu(la->hashval) < be32_to_cpu(lb->hashval) ? -1 :
 881                 (be32_to_cpu(la->hashval) > be32_to_cpu(lb->hashval) ? 1 : 0);
 882 }
 883
 884 /*
 885  * Convert a V2 leaf directory to a V2 block directory if possible.
 886  */
 887 int                                             /* error */
 888 xfs_dir2_leaf_to_block(
 889         xfs_da_args_t           *args,          /* operation arguments */
 890         xfs_dabuf_t             *lbp,           /* leaf buffer */
 891         xfs_dabuf_t             *dbp)           /* data buffer */
 892 {
 893         __be16                  *bestsp;        /* leaf bests table */
 894         xfs_dir2_block_t        *block;         /* block structure */
 895         xfs_dir2_block_tail_t   *btp;           /* block tail */
 896         xfs_inode_t             *dp;            /* incore directory inode */
 897         xfs_dir2_data_unused_t  *dup;           /* unused data entry */
 898         int                     error;          /* error return value */
 899         int                     from;           /* leaf from index */
 900         xfs_dir2_leaf_t         *leaf;          /* leaf structure */
 901         xfs_dir2_leaf_entry_t   *lep;           /* leaf entry */
 902         xfs_dir2_leaf_tail_t    *ltp;           /* leaf tail structure */
 903         xfs_mount_t             *mp;            /* file system mount point */
 904         int                     needlog;        /* need to log data header */
 905         int                     needscan;       /* need to scan for bestfree */
 906         xfs_dir2_sf_hdr_t       sfh;            /* shortform header */
 907         int                     size;           /* bytes used */
 908         __be16                  *tagp;          /* end of entry (tag) */
 909         int                     to;             /* block/leaf to index */
 910         xfs_trans_t             *tp;            /* transaction pointer */
 911
 912         xfs_dir2_trace_args_bb("leaf_to_block", args, lbp, dbp);
 913         dp = args->dp;
 914         tp = args->trans;
 915         mp = dp->i_mount;
 916         leaf = lbp->data;
 917         ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAF1_MAGIC);
 918         ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf);
 919         /*
 920          * If there are data blocks other than the first one, take this
 921          * opportunity to remove trailing empty data blocks that may have
 922          * been left behind during no-space-reservation operations.
 923          * These will show up in the leaf bests table.
 924          */
 925         while (dp->i_d.di_size > mp->m_dirblksize) {
 926                 bestsp = XFS_DIR2_LEAF_BESTS_P(ltp);
 927                 if (be16_to_cpu(bestsp[be32_to_cpu(ltp->bestcount) - 1]) ==
 928                     mp->m_dirblksize - (uint)sizeof(block->hdr)) {
 929                         if ((error =
 930                             xfs_dir2_leaf_trim_data(args, lbp,
 931                                     (xfs_dir2_db_t)(be32_to_cpu(ltp->bestcount) - 1))))
 932                                 goto out;
 933                 } else {
 934                         error = 0;
 935                         goto out;
 936                 }
 937         }
 938         /*
 939          * Read the data block if we don't already have it, give up if it fails.
 940          */
 941         if (dbp == NULL &&
 942             (error = xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &dbp,
 943                     XFS_DATA_FORK))) {
 944                 goto out;
 945         }
 946         block = dbp->data;
 947         ASSERT(be32_to_cpu(block->hdr.magic) == XFS_DIR2_DATA_MAGIC);
 948         /*
 949          * Size of the "leaf" area in the block.
 950          */
 951         size = (uint)sizeof(block->tail) +
 952                (uint)sizeof(*lep) * (be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale));
 953         /*
 954          * Look at the last data entry.
 955          */
 956         tagp = (__be16 *)((char *)block + mp->m_dirblksize) - 1;
 957         dup = (xfs_dir2_data_unused_t *)((char *)block + be16_to_cpu(*tagp));
 958         /*
 959          * If it's not free or is too short we can't do it.
 960          */
 961         if (be16_to_cpu(dup->freetag) != XFS_DIR2_DATA_FREE_TAG ||
 962             be16_to_cpu(dup->length) < size) {
 963                 error = 0;
 964                 goto out;
 965         }
 966         /*
 967          * Start converting it to block form.
 968          */
 969         block->hdr.magic = cpu_to_be32(XFS_DIR2_BLOCK_MAGIC);
 970         needlog = 1;
 971         needscan = 0;
 972         /*
 973          * Use up the space at the end of the block (blp/btp).
 974          */
 975         xfs_dir2_data_use_free(tp, dbp, dup, mp->m_dirblksize - size, size,
 976                 &needlog, &needscan);
 977         /*
 978          * Initialize the block tail.
 979          */
 980         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 981         btp->count = cpu_to_be32(be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale));
 982         btp->stale = 0;
 983         xfs_dir2_block_log_tail(tp, dbp);
 984         /*
 985          * Initialize the block leaf area.  We compact out stale entries.
 986          */
 987         lep = XFS_DIR2_BLOCK_LEAF_P(btp);
 988         for (from = to = 0; from < be16_to_cpu(leaf->hdr.count); from++) {
 989                 if (be32_to_cpu(leaf->ents[from].address) == XFS_DIR2_NULL_DATAPTR)
 990                         continue;
 991                 lep[to++] = leaf->ents[from];
 992         }
 993         ASSERT(to == be32_to_cpu(btp->count));
 994         xfs_dir2_block_log_leaf(tp, dbp, 0, be32_to_cpu(btp->count) - 1);
 995         /*
 996          * Scan the bestfree if we need it and log the data block header.
 997          */
 998         if (needscan)
 999                 xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog,
1000                         NULL);
1001         if (needlog)
1002                 xfs_dir2_data_log_header(tp, dbp);
1003         /*
1004          * Pitch the old leaf block.
1005          */
1006         error = xfs_da_shrink_inode(args, mp->m_dirleafblk, lbp);
1007         lbp = NULL;
1008         if (error) {
1009                 goto out;
1010         }
1011         /*
1012          * Now see if the resulting block can be shrunken to shortform.
1013          */
1014         if ((size = xfs_dir2_block_sfsize(dp, block, &sfh)) >
1015             XFS_IFORK_DSIZE(dp)) {
1016                 error = 0;
1017                 goto out;
1018         }
1019         return xfs_dir2_block_to_sf(args, dbp, size, &sfh);
1020 out:
1021         if (lbp)
1022                 xfs_da_buf_done(lbp);
1023         if (dbp)
1024                 xfs_da_buf_done(dbp);
1025         return error;
1026 }
1027
1028 /*
1029  * Convert the shortform directory to block form.
1030  */
1031 int                                             /* error */
1032 xfs_dir2_sf_to_block(
1033         xfs_da_args_t           *args)          /* operation arguments */
1034 {
1035         xfs_dir2_db_t           blkno;          /* dir-relative block # (0) */
1036         xfs_dir2_block_t        *block;         /* block structure */
1037         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
1038         xfs_dabuf_t             *bp;            /* block buffer */
1039         xfs_dir2_block_tail_t   *btp;           /* block tail pointer */
1040         char                    *buf;           /* sf buffer */
1041         int                     buf_len;
1042         xfs_dir2_data_entry_t   *dep;           /* data entry pointer */
1043         xfs_inode_t             *dp;            /* incore directory inode */
1044         int                     dummy;          /* trash */
1045         xfs_dir2_data_unused_t  *dup;           /* unused entry pointer */
1046         int                     endoffset;      /* end of data objects */
1047         int                     error;          /* error return value */
1048         int                     i;              /* index */
1049         xfs_mount_t             *mp;            /* filesystem mount point */
1050         int                     needlog;        /* need to log block header */
1051         int                     needscan;       /* need to scan block freespc */
1052         int                     newoffset;      /* offset from current entry */
1053         int                     offset;         /* target block offset */
1054         xfs_dir2_sf_entry_t     *sfep;          /* sf entry pointer */
1055         xfs_dir2_sf_t           *sfp;           /* shortform structure */
1056         __be16                  *tagp;          /* end of data entry */
1057         xfs_trans_t             *tp;            /* transaction pointer */
1058
1059         xfs_dir2_trace_args("sf_to_block", args);
1060         dp = args->dp;
1061         tp = args->trans;
1062         mp = dp->i_mount;
1063         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
1064         /*
1065          * Bomb out if the shortform directory is way too short.
1066          */
1067         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
1068                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1069                 return XFS_ERROR(EIO);
1070         }
1071         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
1072         ASSERT(dp->i_df.if_u1.if_data != NULL);
1073         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1074         ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
1075         /*
1076          * Copy the directory into the stack buffer.
1077          * Then pitch the incore inode data so we can make extents.
1078          */
1079
1080         buf_len = dp->i_df.if_bytes;
1081         buf = kmem_alloc(dp->i_df.if_bytes, KM_SLEEP);
1082
1083         memcpy(buf, sfp, dp->i_df.if_bytes);
1084         xfs_idata_realloc(dp, -dp->i_df.if_bytes, XFS_DATA_FORK);
1085         dp->i_d.di_size = 0;
1086         xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1087         /*
1088          * Reset pointer - old sfp is gone.
1089          */
1090         sfp = (xfs_dir2_sf_t *)buf;
1091         /*
1092          * Add block 0 to the inode.
1093          */
1094         error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE, &blkno);
1095         if (error) {
1096                 kmem_free(buf, buf_len);
1097                 return error;
1098         }
1099         /*
1100          * Initialize the data block.
1101          */
1102         error = xfs_dir2_data_init(args, blkno, &bp);
1103         if (error) {
1104                 kmem_free(buf, buf_len);
1105                 return error;
1106         }
1107         block = bp->data;
1108         block->hdr.magic = cpu_to_be32(XFS_DIR2_BLOCK_MAGIC);
1109         /*
1110          * Compute size of block "tail" area.
1111          */
1112         i = (uint)sizeof(*btp) +
1113             (sfp->hdr.count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t);
1114         /*
1115          * The whole thing is initialized to free by the init routine.
1116          * Say we're using the leaf and tail area.
1117          */
1118         dup = (xfs_dir2_data_unused_t *)block->u;
1119         needlog = needscan = 0;
1120         xfs_dir2_data_use_free(tp, bp, dup, mp->m_dirblksize - i, i, &needlog,
1121                 &needscan);
1122         ASSERT(needscan == 0);
1123         /*
1124          * Fill in the tail.
1125          */
1126         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
1127         btp->count = cpu_to_be32(sfp->hdr.count + 2);   /* ., .. */
1128         btp->stale = 0;
1129         blp = XFS_DIR2_BLOCK_LEAF_P(btp);
1130         endoffset = (uint)((char *)blp - (char *)block);
1131         /*
1132          * Remove the freespace, we'll manage it.
1133          */
1134         xfs_dir2_data_use_free(tp, bp, dup,
1135                 (xfs_dir2_data_aoff_t)((char *)dup - (char *)block),
1136                 be16_to_cpu(dup->length), &needlog, &needscan);
1137         /*
1138          * Create entry for .
1139          */
1140         dep = (xfs_dir2_data_entry_t *)
1141               ((char *)block + XFS_DIR2_DATA_DOT_OFFSET);
1142         dep->inumber = cpu_to_be64(dp->i_ino);
1143         dep->namelen = 1;
1144         dep->name[0] = '.';
1145         tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep);
1146         *tagp = cpu_to_be16((char *)dep - (char *)block);
1147         xfs_dir2_data_log_entry(tp, bp, dep);
1148         blp[0].hashval = cpu_to_be32(xfs_dir_hash_dot);
1149         blp[0].address = cpu_to_be32(XFS_DIR2_BYTE_TO_DATAPTR(mp,
1150                                 (char *)dep - (char *)block));
1151         /*
1152          * Create entry for ..
1153          */
1154         dep = (xfs_dir2_data_entry_t *)
1155                 ((char *)block + XFS_DIR2_DATA_DOTDOT_OFFSET);
1156         dep->inumber = cpu_to_be64(XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent));
1157         dep->namelen = 2;
1158         dep->name[0] = dep->name[1] = '.';
1159         tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep);
1160         *tagp = cpu_to_be16((char *)dep - (char *)block);
1161         xfs_dir2_data_log_entry(tp, bp, dep);
1162         blp[1].hashval = cpu_to_be32(xfs_dir_hash_dotdot);
1163         blp[1].address = cpu_to_be32(XFS_DIR2_BYTE_TO_DATAPTR(mp,
1164                                 (char *)dep - (char *)block));
1165         offset = XFS_DIR2_DATA_FIRST_OFFSET;
1166         /*
1167          * Loop over existing entries, stuff them in.
1168          */
1169         if ((i = 0) == sfp->hdr.count)
1170                 sfep = NULL;
1171         else
1172                 sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
1173         /*
1174          * Need to preserve the existing offset values in the sf directory.
1175          * Insert holes (unused entries) where necessary.
1176          */
1177         while (offset < endoffset) {
1178                 /*
1179                  * sfep is null when we reach the end of the list.
1180                  */
1181                 if (sfep == NULL)
1182                         newoffset = endoffset;
1183                 else
1184                         newoffset = XFS_DIR2_SF_GET_OFFSET(sfep);
1185                 /*
1186                  * There should be a hole here, make one.
1187                  */
1188                 if (offset < newoffset) {
1189                         dup = (xfs_dir2_data_unused_t *)
1190                               ((char *)block + offset);
1191                         dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
1192                         dup->length = cpu_to_be16(newoffset - offset);
1193                         *XFS_DIR2_DATA_UNUSED_TAG_P(dup) = cpu_to_be16(
1194                                 ((char *)dup - (char *)block));
1195                         xfs_dir2_data_log_unused(tp, bp, dup);
1196                         (void)xfs_dir2_data_freeinsert((xfs_dir2_data_t *)block,
1197                                 dup, &dummy);
1198                         offset += be16_to_cpu(dup->length);
1199                         continue;
1200                 }
1201                 /*
1202                  * Copy a real entry.
1203                  */
1204                 dep = (xfs_dir2_data_entry_t *)((char *)block + newoffset);
1205                 dep->inumber = cpu_to_be64(XFS_DIR2_SF_GET_INUMBER(sfp,
1206                                 XFS_DIR2_SF_INUMBERP(sfep)));
1207                 dep->namelen = sfep->namelen;
1208                 memcpy(dep->name, sfep->name, dep->namelen);
1209                 tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep);
1210                 *tagp = cpu_to_be16((char *)dep - (char *)block);
1211                 xfs_dir2_data_log_entry(tp, bp, dep);
1212                 blp[2 + i].hashval = cpu_to_be32(xfs_da_hashname(
1213                                         (char *)sfep->name, sfep->namelen));
1214                 blp[2 + i].address = cpu_to_be32(XFS_DIR2_BYTE_TO_DATAPTR(mp,
1215                                                  (char *)dep - (char *)block));
1216                 offset = (int)((char *)(tagp + 1) - (char *)block);
1217                 if (++i == sfp->hdr.count)
1218                         sfep = NULL;
1219                 else
1220                         sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep);
1221         }
1222         /* Done with the temporary buffer */
1223         kmem_free(buf, buf_len);
1224         /*
1225          * Sort the leaf entries by hash value.
1226          */
1227         xfs_sort(blp, be32_to_cpu(btp->count), sizeof(*blp), xfs_dir2_block_sort);
1228         /*
1229          * Log the leaf entry area and tail.
1230          * Already logged the header in data_init, ignore needlog.
1231          */
1232         ASSERT(needscan == 0);
1233         xfs_dir2_block_log_leaf(tp, bp, 0, be32_to_cpu(btp->count) - 1);
1234         xfs_dir2_block_log_tail(tp, bp);
1235         xfs_dir2_data_check(dp, bp);
1236         xfs_da_buf_done(bp);
1237         return 0;
1238 }