sys/gnu/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_dir.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_dir_sf.h"
  32 #include "xfs_dir2_sf.h"
  33 #include "xfs_attr_sf.h"
  34 #include "xfs_dinode.h"
  35 #include "xfs_inode.h"
  36 #include "xfs_inode_item.h"
  37 #include "xfs_dir_leaf.h"
  38 #include "xfs_dir2_data.h"
  39 #include "xfs_dir2_leaf.h"
  40 #include "xfs_dir2_block.h"
  41 #include "xfs_dir2_trace.h"
  42 #include "xfs_error.h"
  43
  44 /*
  45  * Local function prototypes.
  46  */
  47 static void xfs_dir2_block_log_leaf(xfs_trans_t *tp, xfs_dabuf_t *bp, int first,
  48                                     int last);
  49 static void xfs_dir2_block_log_tail(xfs_trans_t *tp, xfs_dabuf_t *bp);
  50 static int xfs_dir2_block_lookup_int(xfs_da_args_t *args, xfs_dabuf_t **bpp,
  51                                      int *entno);
  52 static int xfs_dir2_block_sort(const void *a, const void *b);
  53
  54 /*
  55  * Add an entry to a block directory.
  56  */
  57 int                                             /* error */
  58 xfs_dir2_block_addname(
  59         xfs_da_args_t           *args)          /* directory op arguments */
  60 {
  61         xfs_dir2_data_free_t    *bf;            /* bestfree table in block */
  62         xfs_dir2_block_t        *block;         /* directory block structure */
  63         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
  64         xfs_dabuf_t             *bp;            /* buffer for block */
  65         xfs_dir2_block_tail_t   *btp;           /* block tail */
  66         int                     compact;        /* need to compact leaf ents */
  67         xfs_dir2_data_entry_t   *dep;           /* block data entry */
  68         xfs_inode_t             *dp;            /* directory inode */
  69         xfs_dir2_data_unused_t  *dup;           /* block unused entry */
  70         int                     error;          /* error return value */
  71         xfs_dir2_data_unused_t  *enddup=NULL;   /* unused at end of data */
  72         xfs_dahash_t            hash;           /* hash value of found entry */
  73         int                     high;           /* high index for binary srch */
  74         int                     highstale;      /* high stale index */
  75         int                     lfloghigh=0;    /* last final leaf to log */
  76         int                     lfloglow=0;     /* first final leaf to log */
  77         int                     len;            /* length of the new entry */
  78         int                     low;            /* low index for binary srch */
  79         int                     lowstale;       /* low stale index */
  80         int                     mid=0;          /* midpoint for binary srch */
  81         xfs_mount_t             *mp;            /* filesystem mount point */
  82         int                     needlog;        /* need to log header */
  83         int                     needscan;       /* need to rescan freespace */
  84         __be16                  *tagp;          /* pointer to tag value */
  85         xfs_trans_t             *tp;            /* transaction structure */
  86
  87         xfs_dir2_trace_args("block_addname", args);
  88         dp = args->dp;
  89         tp = args->trans;
  90         mp = dp->i_mount;
  91         /*
  92          * Read the (one and only) directory block into dabuf bp.
  93          */
  94         if ((error =
  95             xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
  96                 return error;
  97         }
  98         ASSERT(bp != NULL);
  99         block = bp->data;
 100         /*
 101          * Check the magic number, corrupted if wrong.
 102          */
 103         if (unlikely(be32_to_cpu(block->hdr.magic) != XFS_DIR2_BLOCK_MAGIC)) {
 104                 XFS_CORRUPTION_ERROR("xfs_dir2_block_addname",
 105                                      XFS_ERRLEVEL_LOW, mp, block);
 106                 xfs_da_brelse(tp, bp);
 107                 return XFS_ERROR(EFSCORRUPTED);
 108         }
 109         len = XFS_DIR2_DATA_ENTSIZE(args->namelen);
 110         /*
 111          * Set up pointers to parts of the block.
 112          */
 113         bf = block->hdr.bestfree;
 114         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 115         blp = XFS_DIR2_BLOCK_LEAF_P(btp);
 116         /*
 117          * No stale entries?  Need space for entry and new leaf.
 118          */
 119         if (!btp->stale) {
 120                 /*
 121                  * Tag just before the first leaf entry.
 122                  */
 123                 tagp = (__be16 *)blp - 1;
 124                 /*
 125                  * Data object just before the first leaf entry.
 126                  */
 127                 enddup = (xfs_dir2_data_unused_t *)((char *)block + be16_to_cpu(*tagp));
 128                 /*
 129                  * If it's not free then can't do this add without cleaning up:
 130                  * the space before the first leaf entry needs to be free so it
 131                  * can be expanded to hold the pointer to the new entry.
 132                  */
 133                 if (be16_to_cpu(enddup->freetag) != XFS_DIR2_DATA_FREE_TAG)
 134                         dup = enddup = NULL;
 135                 /*
 136                  * Check out the biggest freespace and see if it's the same one.
 137                  */
 138                 else {
 139                         dup = (xfs_dir2_data_unused_t *)
 140                               ((char *)block + be16_to_cpu(bf[0].offset));
 141                         if (dup == enddup) {
 142                                 /*
 143                                  * It is the biggest freespace, is it too small
 144                                  * to hold the new leaf too?
 145                                  */
 146                                 if (be16_to_cpu(dup->length) < len + (uint)sizeof(*blp)) {
 147                                         /*
 148                                          * Yes, we use the second-largest
 149                                          * entry instead if it works.
 150                                          */
 151                                         if (be16_to_cpu(bf[1].length) >= len)
 152                                                 dup = (xfs_dir2_data_unused_t *)
 153                                                       ((char *)block +
 154                                                        be16_to_cpu(bf[1].offset));
 155                                         else
 156                                                 dup = NULL;
 157                                 }
 158                         } else {
 159                                 /*
 160                                  * Not the same free entry,
 161                                  * just check its length.
 162                                  */
 163                                 if (be16_to_cpu(dup->length) < len) {
 164                                         dup = NULL;
 165                                 }
 166                         }
 167                 }
 168                 compact = 0;
 169         }
 170         /*
 171          * If there are stale entries we'll use one for the leaf.
 172          * Is the biggest entry enough to avoid compaction?
 173          */
 174         else if (be16_to_cpu(bf[0].length) >= len) {
 175                 dup = (xfs_dir2_data_unused_t *)
 176                       ((char *)block + be16_to_cpu(bf[0].offset));
 177                 compact = 0;
 178         }
 179         /*
 180          * Will need to compact to make this work.
 181          */
 182         else {
 183                 /*
 184                  * Tag just before the first leaf entry.
 185                  */
 186                 tagp = (__be16 *)blp - 1;
 187                 /*
 188                  * Data object just before the first leaf entry.
 189                  */
 190                 dup = (xfs_dir2_data_unused_t *)((char *)block + be16_to_cpu(*tagp));
 191                 /*
 192                  * If it's not free then the data will go where the
 193                  * leaf data starts now, if it works at all.
 194                  */
 195                 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
 196                         if (be16_to_cpu(dup->length) + (be32_to_cpu(btp->stale) - 1) *
 197                             (uint)sizeof(*blp) < len)
 198                                 dup = NULL;
 199                 } else if ((be32_to_cpu(btp->stale) - 1) * (uint)sizeof(*blp) < len)
 200                         dup = NULL;
 201                 else
 202                         dup = (xfs_dir2_data_unused_t *)blp;
 203                 compact = 1;
 204         }
 205         /*
 206          * If this isn't a real add, we're done with the buffer.
 207          */
 208         if (args->justcheck)
 209                 xfs_da_brelse(tp, bp);
 210         /*
 211          * If we don't have space for the new entry & leaf ...
 212          */
 213         if (!dup) {
 214                 /*
 215                  * Not trying to actually do anything, or don't have
 216                  * a space reservation: return no-space.
 217                  */
 218                 if (args->justcheck || args->total == 0)
 219                         return XFS_ERROR(ENOSPC);
 220                 /*
 221                  * Convert to the next larger format.
 222                  * Then add the new entry in that format.
 223                  */
 224                 error = xfs_dir2_block_to_leaf(args, bp);
 225                 xfs_da_buf_done(bp);
 226                 if (error)
 227                         return error;
 228                 return xfs_dir2_leaf_addname(args);
 229         }
 230         /*
 231          * Just checking, and it would work, so say so.
 232          */
 233         if (args->justcheck)
 234                 return 0;
 235         needlog = needscan = 0;
 236         /*
 237          * If need to compact the leaf entries, do it now.
 238          * Leave the highest-numbered stale entry stale.
 239          * XXX should be the one closest to mid but mid is not yet computed.
 240          */
 241         if (compact) {
 242                 int     fromidx;                /* source leaf index */
 243                 int     toidx;                  /* target leaf index */
 244
 245                 for (fromidx = toidx = be32_to_cpu(btp->count) - 1,
 246                         highstale = lfloghigh = -1;
 247                      fromidx >= 0;
 248                      fromidx--) {
 249                         if (be32_to_cpu(blp[fromidx].address) == XFS_DIR2_NULL_DATAPTR) {
 250                                 if (highstale == -1)
 251                                         highstale = toidx;
 252                                 else {
 253                                         if (lfloghigh == -1)
 254                                                 lfloghigh = toidx;
 255                                         continue;
 256                                 }
 257                         }
 258                         if (fromidx < toidx)
 259                                 blp[toidx] = blp[fromidx];
 260                         toidx--;
 261                 }
 262                 lfloglow = toidx + 1 - (be32_to_cpu(btp->stale) - 1);
 263                 lfloghigh -= be32_to_cpu(btp->stale) - 1;
 264                 be32_add(&btp->count, -(be32_to_cpu(btp->stale) - 1));
 265                 xfs_dir2_data_make_free(tp, bp,
 266                         (xfs_dir2_data_aoff_t)((char *)blp - (char *)block),
 267                         (xfs_dir2_data_aoff_t)((be32_to_cpu(btp->stale) - 1) * sizeof(*blp)),
 268                         &needlog, &needscan);
 269                 blp += be32_to_cpu(btp->stale) - 1;
 270                 btp->stale = cpu_to_be32(1);
 271                 /*
 272                  * If we now need to rebuild the bestfree map, do so.
 273                  * This needs to happen before the next call to use_free.
 274                  */
 275                 if (needscan) {
 276                         xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block,
 277                                 &needlog, NULL);
 278                         needscan = 0;
 279                 }
 280         }
 281         /*
 282          * Set leaf logging boundaries to impossible state.
 283          * For the no-stale case they're set explicitly.
 284          */
 285         else if (btp->stale) {
 286                 lfloglow = be32_to_cpu(btp->count);
 287                 lfloghigh = -1;
 288         }
 289         /*
 290          * Find the slot that's first lower than our hash value, -1 if none.
 291          */
 292         for (low = 0, high = be32_to_cpu(btp->count) - 1; low <= high; ) {
 293                 mid = (low + high) >> 1;
 294                 if ((hash = be32_to_cpu(blp[mid].hashval)) == args->hashval)
 295                         break;
 296                 if (hash < args->hashval)
 297                         low = mid + 1;
 298                 else
 299                         high = mid - 1;
 300         }
 301         while (mid >= 0 && be32_to_cpu(blp[mid].hashval) >= args->hashval) {
 302                 mid--;
 303         }
 304         /*
 305          * No stale entries, will use enddup space to hold new leaf.
 306          */
 307         if (!btp->stale) {
 308                 /*
 309                  * Mark the space needed for the new leaf entry, now in use.
 310                  */
 311                 xfs_dir2_data_use_free(tp, bp, enddup,
 312                         (xfs_dir2_data_aoff_t)
 313                         ((char *)enddup - (char *)block + be16_to_cpu(enddup->length) -
 314                          sizeof(*blp)),
 315                         (xfs_dir2_data_aoff_t)sizeof(*blp),
 316                         &needlog, &needscan);
 317                 /*
 318                  * Update the tail (entry count).
 319                  */
 320                 be32_add(&btp->count, 1);
 321                 /*
 322                  * If we now need to rebuild the bestfree map, do so.
 323                  * This needs to happen before the next call to use_free.
 324                  */
 325                 if (needscan) {
 326                         xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block,
 327                                 &needlog, NULL);
 328                         needscan = 0;
 329                 }
 330                 /*
 331                  * Adjust pointer to the first leaf entry, we're about to move
 332                  * the table up one to open up space for the new leaf entry.
 333                  * Then adjust our index to match.
 334                  */
 335                 blp--;
 336                 mid++;
 337                 if (mid)
 338                         memmove(blp, &blp[1], mid * sizeof(*blp));
 339                 lfloglow = 0;
 340                 lfloghigh = mid;
 341         }
 342         /*
 343          * Use a stale leaf for our new entry.
 344          */
 345         else {
 346                 for (lowstale = mid;
 347                      lowstale >= 0 &&
 348                         be32_to_cpu(blp[lowstale].address) != XFS_DIR2_NULL_DATAPTR;
 349                      lowstale--)
 350                         continue;
 351                 for (highstale = mid + 1;
 352                      highstale < be32_to_cpu(btp->count) &&
 353                         be32_to_cpu(blp[highstale].address) != XFS_DIR2_NULL_DATAPTR &&
 354                         (lowstale < 0 || mid - lowstale > highstale - mid);
 355                      highstale++)
 356                         continue;
 357                 /*
 358                  * Move entries toward the low-numbered stale entry.
 359                  */
 360                 if (lowstale >= 0 &&
 361                     (highstale == be32_to_cpu(btp->count) ||
 362                      mid - lowstale <= highstale - mid)) {
 363                         if (mid - lowstale)
 364                                 memmove(&blp[lowstale], &blp[lowstale + 1],
 365                                         (mid - lowstale) * sizeof(*blp));
 366                         lfloglow = MIN(lowstale, lfloglow);
 367                         lfloghigh = MAX(mid, lfloghigh);
 368                 }
 369                 /*
 370                  * Move entries toward the high-numbered stale entry.
 371                  */
 372                 else {
 373                         ASSERT(highstale < be32_to_cpu(btp->count));
 374                         mid++;
 375                         if (highstale - mid)
 376                                 memmove(&blp[mid + 1], &blp[mid],
 377                                         (highstale - mid) * sizeof(*blp));
 378                         lfloglow = MIN(mid, lfloglow);
 379                         lfloghigh = MAX(highstale, lfloghigh);
 380                 }
 381                 be32_add(&btp->stale, -1);
 382         }
 383         /*
 384          * Point to the new data entry.
 385          */
 386         dep = (xfs_dir2_data_entry_t *)dup;
 387         /*
 388          * Fill in the leaf entry.
 389          */
 390         blp[mid].hashval = cpu_to_be32(args->hashval);
 391         blp[mid].address = cpu_to_be32(XFS_DIR2_BYTE_TO_DATAPTR(mp,
 392                                 (char *)dep - (char *)block));
 393         xfs_dir2_block_log_leaf(tp, bp, lfloglow, lfloghigh);
 394         /*
 395          * Mark space for the data entry used.
 396          */
 397         xfs_dir2_data_use_free(tp, bp, dup,
 398                 (xfs_dir2_data_aoff_t)((char *)dup - (char *)block),
 399                 (xfs_dir2_data_aoff_t)len, &needlog, &needscan);
 400         /*
 401          * Create the new data entry.
 402          */
 403         INT_SET(dep->inumber, ARCH_CONVERT, args->inumber);
 404         dep->namelen = args->namelen;
 405         memcpy(dep->name, args->name, args->namelen);
 406         tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep);
 407         *tagp = cpu_to_be16((char *)dep - (char *)block);
 408         /*
 409          * Clean up the bestfree array and log the header, tail, and entry.
 410          */
 411         if (needscan)
 412                 xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog,
 413                         NULL);
 414         if (needlog)
 415                 xfs_dir2_data_log_header(tp, bp);
 416         xfs_dir2_block_log_tail(tp, bp);
 417         xfs_dir2_data_log_entry(tp, bp, dep);
 418         xfs_dir2_data_check(dp, bp);
 419         xfs_da_buf_done(bp);
 420         return 0;
 421 }
 422
 423 /*
 424  * Readdir for block directories.
 425  */
 426 int                                             /* error */
 427 xfs_dir2_block_getdents(
 428         xfs_trans_t             *tp,            /* transaction (NULL) */
 429         xfs_inode_t             *dp,            /* incore inode */
 430         uio_t                   *uio,           /* caller's buffer control */
 431         int                     *eofp,          /* eof reached? (out) */
 432         xfs_dirent_t            *dbp,           /* caller's buffer */
 433         xfs_dir2_put_t          put)            /* abi's formatting function */
 434 {
 435         xfs_dir2_block_t        *block;         /* directory block structure */
 436         xfs_dabuf_t             *bp;            /* buffer for block */
 437         xfs_dir2_block_tail_t   *btp;           /* block tail */
 438         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 439         xfs_dir2_data_unused_t  *dup;           /* block unused entry */
 440         char                    *endptr;        /* end of the data entries */
 441         int                     error;          /* error return value */
 442         xfs_mount_t             *mp;            /* filesystem mount point */
 443         xfs_dir2_put_args_t     p;              /* arg package for put rtn */
 444         char                    *ptr;           /* current data entry */
 445         int                     wantoff;        /* starting block offset */
 446
 447         mp = dp->i_mount;
 448         /*
 449          * If the block number in the offset is out of range, we're done.
 450          */
 451         if (XFS_DIR2_DATAPTR_TO_DB(mp, uio->uio_offset) > mp->m_dirdatablk) {
 452                 *eofp = 1;
 453                 return 0;
 454         }
 455         /*
 456          * Can't read the block, give up, else get dabuf in bp.
 457          */
 458         if ((error =
 459             xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
 460                 return error;
 461         }
 462         ASSERT(bp != NULL);
 463         /*
 464          * Extract the byte offset we start at from the seek pointer.
 465          * We'll skip entries before this.
 466          */
 467         wantoff = XFS_DIR2_DATAPTR_TO_OFF(mp, uio->uio_offset);
 468         block = bp->data;
 469         xfs_dir2_data_check(dp, bp);
 470         /*
 471          * Set up values for the loop.
 472          */
 473         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 474         ptr = (char *)block->u;
 475         endptr = (char *)XFS_DIR2_BLOCK_LEAF_P(btp);
 476         p.dbp = dbp;
 477         p.put = put;
 478         p.uio = uio;
 479         /*
 480          * Loop over the data portion of the block.
 481          * Each object is a real entry (dep) or an unused one (dup).
 482          */
 483         while (ptr < endptr) {
 484                 dup = (xfs_dir2_data_unused_t *)ptr;
 485                 /*
 486                  * Unused, skip it.
 487                  */
 488                 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
 489                         ptr += be16_to_cpu(dup->length);
 490                         continue;
 491                 }
 492
 493                 dep = (xfs_dir2_data_entry_t *)ptr;
 494
 495                 /*
 496                  * Bump pointer for the next iteration.
 497                  */
 498                 ptr += XFS_DIR2_DATA_ENTSIZE(dep->namelen);
 499                 /*
 500                  * The entry is before the desired starting point, skip it.
 501                  */
 502                 if ((char *)dep - (char *)block < wantoff)
 503                         continue;
 504                 /*
 505                  * Set up argument structure for put routine.
 506                  */
 507                 p.namelen = dep->namelen;
 508
 509                 p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 510                                                     ptr - (char *)block);
 511                 p.ino = INT_GET(dep->inumber, ARCH_CONVERT);
 512 #if XFS_BIG_INUMS
 513                 p.ino += mp->m_inoadd;
 514 #endif
 515                 p.name = (char *)dep->name;
 516
 517                 /*
 518                  * Put the entry in the caller's buffer.
 519                  */
 520                 error = p.put(&p);
 521
 522                 /*
 523                  * If it didn't fit, set the final offset to here & return.
 524                  */
 525                 if (!p.done) {
 526                         uio->uio_offset =
 527                                 XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
 528                                         (char *)dep - (char *)block);
 529                         xfs_da_brelse(tp, bp);
 530                         return error;
 531                 }
 532         }
 533
 534         /*
 535          * Reached the end of the block.
 536          * Set the offset to a non-existent block 1 and return.
 537          */
 538         *eofp = 1;
 539
 540         uio->uio_offset =
 541                 XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk + 1, 0);
 542
 543         xfs_da_brelse(tp, bp);
 544
 545         return 0;
 546 }
 547
 548 /*
 549  * Log leaf entries from the block.
 550  */
 551 static void
 552 xfs_dir2_block_log_leaf(
 553         xfs_trans_t             *tp,            /* transaction structure */
 554         xfs_dabuf_t             *bp,            /* block buffer */
 555         int                     first,          /* index of first logged leaf */
 556         int                     last)           /* index of last logged leaf */
 557 {
 558         xfs_dir2_block_t        *block;         /* directory block structure */
 559         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 560         xfs_dir2_block_tail_t   *btp;           /* block tail */
 561         xfs_mount_t             *mp;            /* filesystem mount point */
 562
 563         mp = tp->t_mountp;
 564         block = bp->data;
 565         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 566         blp = XFS_DIR2_BLOCK_LEAF_P(btp);
 567         xfs_da_log_buf(tp, bp, (uint)((char *)&blp[first] - (char *)block),
 568                 (uint)((char *)&blp[last + 1] - (char *)block - 1));
 569 }
 570
 571 /*
 572  * Log the block tail.
 573  */
 574 static void
 575 xfs_dir2_block_log_tail(
 576         xfs_trans_t             *tp,            /* transaction structure */
 577         xfs_dabuf_t             *bp)            /* block buffer */
 578 {
 579         xfs_dir2_block_t        *block;         /* directory block structure */
 580         xfs_dir2_block_tail_t   *btp;           /* block tail */
 581         xfs_mount_t             *mp;            /* filesystem mount point */
 582
 583         mp = tp->t_mountp;
 584         block = bp->data;
 585         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 586         xfs_da_log_buf(tp, bp, (uint)((char *)btp - (char *)block),
 587                 (uint)((char *)(btp + 1) - (char *)block - 1));
 588 }
 589
 590 /*
 591  * Look up an entry in the block.  This is the external routine,
 592  * xfs_dir2_block_lookup_int does the real work.
 593  */
 594 int                                             /* error */
 595 xfs_dir2_block_lookup(
 596         xfs_da_args_t           *args)          /* dir lookup arguments */
 597 {
 598         xfs_dir2_block_t        *block;         /* block structure */
 599         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 600         xfs_dabuf_t             *bp;            /* block buffer */
 601         xfs_dir2_block_tail_t   *btp;           /* block tail */
 602         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 603         xfs_inode_t             *dp;            /* incore inode */
 604         int                     ent;            /* entry index */
 605         int                     error;          /* error return value */
 606         xfs_mount_t             *mp;            /* filesystem mount point */
 607
 608         xfs_dir2_trace_args("block_lookup", args);
 609         /*
 610          * Get the buffer, look up the entry.
 611          * If not found (ENOENT) then return, have no buffer.
 612          */
 613         if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent)))
 614                 return error;
 615         dp = args->dp;
 616         mp = dp->i_mount;
 617         block = bp->data;
 618         xfs_dir2_data_check(dp, bp);
 619         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 620         blp = XFS_DIR2_BLOCK_LEAF_P(btp);
 621         /*
 622          * Get the offset from the leaf entry, to point to the data.
 623          */
 624         dep = (xfs_dir2_data_entry_t *)
 625               ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, be32_to_cpu(blp[ent].address)));
 626         /*
 627          * Fill in inode number, release the block.
 628          */
 629         args->inumber = INT_GET(dep->inumber, ARCH_CONVERT);
 630         xfs_da_brelse(args->trans, bp);
 631         return XFS_ERROR(EEXIST);
 632 }
 633
 634 /*
 635  * Internal block lookup routine.
 636  */
 637 static int                                      /* error */
 638 xfs_dir2_block_lookup_int(
 639         xfs_da_args_t           *args,          /* dir lookup arguments */
 640         xfs_dabuf_t             **bpp,          /* returned block buffer */
 641         int                     *entno)         /* returned entry number */
 642 {
 643         xfs_dir2_dataptr_t      addr;           /* data entry address */
 644         xfs_dir2_block_t        *block;         /* block structure */
 645         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 646         xfs_dabuf_t             *bp;            /* block buffer */
 647         xfs_dir2_block_tail_t   *btp;           /* block tail */
 648         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 649         xfs_inode_t             *dp;            /* incore inode */
 650         int                     error;          /* error return value */
 651         xfs_dahash_t            hash;           /* found hash value */
 652         int                     high;           /* binary search high index */
 653         int                     low;            /* binary search low index */
 654         int                     mid;            /* binary search current idx */
 655         xfs_mount_t             *mp;            /* filesystem mount point */
 656         xfs_trans_t             *tp;            /* transaction pointer */
 657
 658         dp = args->dp;
 659         tp = args->trans;
 660         mp = dp->i_mount;
 661         /*
 662          * Read the buffer, return error if we can't get it.
 663          */
 664         if ((error =
 665             xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
 666                 return error;
 667         }
 668         ASSERT(bp != NULL);
 669         block = bp->data;
 670         xfs_dir2_data_check(dp, bp);
 671         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 672         blp = XFS_DIR2_BLOCK_LEAF_P(btp);
 673         /*
 674          * Loop doing a binary search for our hash value.
 675          * Find our entry, ENOENT if it's not there.
 676          */
 677         for (low = 0, high = be32_to_cpu(btp->count) - 1; ; ) {
 678                 ASSERT(low <= high);
 679                 mid = (low + high) >> 1;
 680                 if ((hash = be32_to_cpu(blp[mid].hashval)) == args->hashval)
 681                         break;
 682                 if (hash < args->hashval)
 683                         low = mid + 1;
 684                 else
 685                         high = mid - 1;
 686                 if (low > high) {
 687                         ASSERT(args->oknoent);
 688                         xfs_da_brelse(tp, bp);
 689                         return XFS_ERROR(ENOENT);
 690                 }
 691         }
 692         /*
 693          * Back up to the first one with the right hash value.
 694          */
 695         while (mid > 0 && be32_to_cpu(blp[mid - 1].hashval) == args->hashval) {
 696                 mid--;
 697         }
 698         /*
 699          * Now loop forward through all the entries with the
 700          * right hash value looking for our name.
 701          */
 702         do {
 703                 if ((addr = be32_to_cpu(blp[mid].address)) == XFS_DIR2_NULL_DATAPTR)
 704                         continue;
 705                 /*
 706                  * Get pointer to the entry from the leaf.
 707                  */
 708                 dep = (xfs_dir2_data_entry_t *)
 709                         ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, addr));
 710                 /*
 711                  * Compare, if it's right give back buffer & entry number.
 712                  */
 713                 if (dep->namelen == args->namelen &&
 714                     dep->name[0] == args->name[0] &&
 715                     memcmp(dep->name, args->name, args->namelen) == 0) {
 716                         *bpp = bp;
 717                         *entno = mid;
 718                         return 0;
 719                 }
 720         } while (++mid < be32_to_cpu(btp->count) && be32_to_cpu(blp[mid].hashval) == hash);
 721         /*
 722          * No match, release the buffer and return ENOENT.
 723          */
 724         ASSERT(args->oknoent);
 725         xfs_da_brelse(tp, bp);
 726         return XFS_ERROR(ENOENT);
 727 }
 728
 729 /*
 730  * Remove an entry from a block format directory.
 731  * If that makes the block small enough to fit in shortform, transform it.
 732  */
 733 int                                             /* error */
 734 xfs_dir2_block_removename(
 735         xfs_da_args_t           *args)          /* directory operation args */
 736 {
 737         xfs_dir2_block_t        *block;         /* block structure */
 738         xfs_dir2_leaf_entry_t   *blp;           /* block leaf pointer */
 739         xfs_dabuf_t             *bp;            /* block buffer */
 740         xfs_dir2_block_tail_t   *btp;           /* block tail */
 741         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 742         xfs_inode_t             *dp;            /* incore inode */
 743         int                     ent;            /* block leaf entry index */
 744         int                     error;          /* error return value */
 745         xfs_mount_t             *mp;            /* filesystem mount point */
 746         int                     needlog;        /* need to log block header */
 747         int                     needscan;       /* need to fixup bestfree */
 748         xfs_dir2_sf_hdr_t       sfh;            /* shortform header */
 749         int                     size;           /* shortform size */
 750         xfs_trans_t             *tp;            /* transaction pointer */
 751
 752         xfs_dir2_trace_args("block_removename", args);
 753         /*
 754          * Look up the entry in the block.  Gets the buffer and entry index.
 755          * It will always be there, the vnodeops level does a lookup first.
 756          */
 757         if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
 758                 return error;
 759         }
 760         dp = args->dp;
 761         tp = args->trans;
 762         mp = dp->i_mount;
 763         block = bp->data;
 764         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 765         blp = XFS_DIR2_BLOCK_LEAF_P(btp);
 766         /*
 767          * Point to the data entry using the leaf entry.
 768          */
 769         dep = (xfs_dir2_data_entry_t *)
 770               ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, be32_to_cpu(blp[ent].address)));
 771         /*
 772          * Mark the data entry's space free.
 773          */
 774         needlog = needscan = 0;
 775         xfs_dir2_data_make_free(tp, bp,
 776                 (xfs_dir2_data_aoff_t)((char *)dep - (char *)block),
 777                 XFS_DIR2_DATA_ENTSIZE(dep->namelen), &needlog, &needscan);
 778         /*
 779          * Fix up the block tail.
 780          */
 781         be32_add(&btp->stale, 1);
 782         xfs_dir2_block_log_tail(tp, bp);
 783         /*
 784          * Remove the leaf entry by marking it stale.
 785          */
 786         blp[ent].address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR);
 787         xfs_dir2_block_log_leaf(tp, bp, ent, ent);
 788         /*
 789          * Fix up bestfree, log the header if necessary.
 790          */
 791         if (needscan)
 792                 xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog,
 793                         NULL);
 794         if (needlog)
 795                 xfs_dir2_data_log_header(tp, bp);
 796         xfs_dir2_data_check(dp, bp);
 797         /*
 798          * See if the size as a shortform is good enough.
 799          */
 800         if ((size = xfs_dir2_block_sfsize(dp, block, &sfh)) >
 801             XFS_IFORK_DSIZE(dp)) {
 802                 xfs_da_buf_done(bp);
 803                 return 0;
 804         }
 805         /*
 806          * If it works, do the conversion.
 807          */
 808         return xfs_dir2_block_to_sf(args, bp, size, &sfh);
 809 }
 810
 811 /*
 812  * Replace an entry in a V2 block directory.
 813  * Change the inode number to the new value.
 814  */
 815 int                                             /* error */
 816 xfs_dir2_block_replace(
 817         xfs_da_args_t           *args)          /* directory operation args */
 818 {
 819         xfs_dir2_block_t        *block;         /* block structure */
 820         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
 821         xfs_dabuf_t             *bp;            /* block buffer */
 822         xfs_dir2_block_tail_t   *btp;           /* block tail */
 823         xfs_dir2_data_entry_t   *dep;           /* block data entry */
 824         xfs_inode_t             *dp;            /* incore inode */
 825         int                     ent;            /* leaf entry index */
 826         int                     error;          /* error return value */
 827         xfs_mount_t             *mp;            /* filesystem mount point */
 828
 829         xfs_dir2_trace_args("block_replace", args);
 830         /*
 831          * Lookup the entry in the directory.  Get buffer and entry index.
 832          * This will always succeed since the caller has already done a lookup.
 833          */
 834         if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
 835                 return error;
 836         }
 837         dp = args->dp;
 838         mp = dp->i_mount;
 839         block = bp->data;
 840         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 841         blp = XFS_DIR2_BLOCK_LEAF_P(btp);
 842         /*
 843          * Point to the data entry we need to change.
 844          */
 845         dep = (xfs_dir2_data_entry_t *)
 846               ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, be32_to_cpu(blp[ent].address)));
 847         ASSERT(INT_GET(dep->inumber, ARCH_CONVERT) != args->inumber);
 848         /*
 849          * Change the inode number to the new value.
 850          */
 851         INT_SET(dep->inumber, ARCH_CONVERT, args->inumber);
 852         xfs_dir2_data_log_entry(args->trans, bp, dep);
 853         xfs_dir2_data_check(dp, bp);
 854         xfs_da_buf_done(bp);
 855         return 0;
 856 }
 857
 858 /*
 859  * Qsort comparison routine for the block leaf entries.
 860  */
 861 static int                                      /* sort order */
 862 xfs_dir2_block_sort(
 863         const void                      *a,     /* first leaf entry */
 864         const void                      *b)     /* second leaf entry */
 865 {
 866         const xfs_dir2_leaf_entry_t     *la;    /* first leaf entry */
 867         const xfs_dir2_leaf_entry_t     *lb;    /* second leaf entry */
 868
 869         la = a;
 870         lb = b;
 871         return be32_to_cpu(la->hashval) < be32_to_cpu(lb->hashval) ? -1 :
 872                 (be32_to_cpu(la->hashval) > be32_to_cpu(lb->hashval) ? 1 : 0);
 873 }
 874
 875 /*
 876  * Convert a V2 leaf directory to a V2 block directory if possible.
 877  */
 878 int                                             /* error */
 879 xfs_dir2_leaf_to_block(
 880         xfs_da_args_t           *args,          /* operation arguments */
 881         xfs_dabuf_t             *lbp,           /* leaf buffer */
 882         xfs_dabuf_t             *dbp)           /* data buffer */
 883 {
 884         __be16                  *bestsp;        /* leaf bests table */
 885         xfs_dir2_block_t        *block;         /* block structure */
 886         xfs_dir2_block_tail_t   *btp;           /* block tail */
 887         xfs_inode_t             *dp;            /* incore directory inode */
 888         xfs_dir2_data_unused_t  *dup;           /* unused data entry */
 889         int                     error;          /* error return value */
 890         int                     from;           /* leaf from index */
 891         xfs_dir2_leaf_t         *leaf;          /* leaf structure */
 892         xfs_dir2_leaf_entry_t   *lep;           /* leaf entry */
 893         xfs_dir2_leaf_tail_t    *ltp;           /* leaf tail structure */
 894         xfs_mount_t             *mp;            /* file system mount point */
 895         int                     needlog;        /* need to log data header */
 896         int                     needscan;       /* need to scan for bestfree */
 897         xfs_dir2_sf_hdr_t       sfh;            /* shortform header */
 898         int                     size;           /* bytes used */
 899         __be16                  *tagp;          /* end of entry (tag) */
 900         int                     to;             /* block/leaf to index */
 901         xfs_trans_t             *tp;            /* transaction pointer */
 902
 903         xfs_dir2_trace_args_bb("leaf_to_block", args, lbp, dbp);
 904         dp = args->dp;
 905         tp = args->trans;
 906         mp = dp->i_mount;
 907         leaf = lbp->data;
 908         ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAF1_MAGIC);
 909         ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf);
 910         /*
 911          * If there are data blocks other than the first one, take this
 912          * opportunity to remove trailing empty data blocks that may have
 913          * been left behind during no-space-reservation operations.
 914          * These will show up in the leaf bests table.
 915          */
 916         while (dp->i_d.di_size > mp->m_dirblksize) {
 917                 bestsp = XFS_DIR2_LEAF_BESTS_P(ltp);
 918                 if (be16_to_cpu(bestsp[be32_to_cpu(ltp->bestcount) - 1]) ==
 919                     mp->m_dirblksize - (uint)sizeof(block->hdr)) {
 920                         if ((error =
 921                             xfs_dir2_leaf_trim_data(args, lbp,
 922                                     (xfs_dir2_db_t)(be32_to_cpu(ltp->bestcount) - 1))))
 923                                 goto out;
 924                 } else {
 925                         error = 0;
 926                         goto out;
 927                 }
 928         }
 929         /*
 930          * Read the data block if we don't already have it, give up if it fails.
 931          */
 932         if (dbp == NULL &&
 933             (error = xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &dbp,
 934                     XFS_DATA_FORK))) {
 935                 goto out;
 936         }
 937         block = dbp->data;
 938         ASSERT(be32_to_cpu(block->hdr.magic) == XFS_DIR2_DATA_MAGIC);
 939         /*
 940          * Size of the "leaf" area in the block.
 941          */
 942         size = (uint)sizeof(block->tail) +
 943                (uint)sizeof(*lep) * (be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale));
 944         /*
 945          * Look at the last data entry.
 946          */
 947         tagp = (__be16 *)((char *)block + mp->m_dirblksize) - 1;
 948         dup = (xfs_dir2_data_unused_t *)((char *)block + be16_to_cpu(*tagp));
 949         /*
 950          * If it's not free or is too short we can't do it.
 951          */
 952         if (be16_to_cpu(dup->freetag) != XFS_DIR2_DATA_FREE_TAG ||
 953             be16_to_cpu(dup->length) < size) {
 954                 error = 0;
 955                 goto out;
 956         }
 957         /*
 958          * Start converting it to block form.
 959          */
 960         block->hdr.magic = cpu_to_be32(XFS_DIR2_BLOCK_MAGIC);
 961         needlog = 1;
 962         needscan = 0;
 963         /*
 964          * Use up the space at the end of the block (blp/btp).
 965          */
 966         xfs_dir2_data_use_free(tp, dbp, dup, mp->m_dirblksize - size, size,
 967                 &needlog, &needscan);
 968         /*
 969          * Initialize the block tail.
 970          */
 971         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
 972         btp->count = cpu_to_be32(be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale));
 973         btp->stale = 0;
 974         xfs_dir2_block_log_tail(tp, dbp);
 975         /*
 976          * Initialize the block leaf area.  We compact out stale entries.
 977          */
 978         lep = XFS_DIR2_BLOCK_LEAF_P(btp);
 979         for (from = to = 0; from < be16_to_cpu(leaf->hdr.count); from++) {
 980                 if (be32_to_cpu(leaf->ents[from].address) == XFS_DIR2_NULL_DATAPTR)
 981                         continue;
 982                 lep[to++] = leaf->ents[from];
 983         }
 984         ASSERT(to == be32_to_cpu(btp->count));
 985         xfs_dir2_block_log_leaf(tp, dbp, 0, be32_to_cpu(btp->count) - 1);
 986         /*
 987          * Scan the bestfree if we need it and log the data block header.
 988          */
 989         if (needscan)
 990                 xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog,
 991                         NULL);
 992         if (needlog)
 993                 xfs_dir2_data_log_header(tp, dbp);
 994         /*
 995          * Pitch the old leaf block.
 996          */
 997         error = xfs_da_shrink_inode(args, mp->m_dirleafblk, lbp);
 998         lbp = NULL;
 999         if (error) {
1000                 goto out;
1001         }
1002         /*
1003          * Now see if the resulting block can be shrunken to shortform.
1004          */
1005         if ((size = xfs_dir2_block_sfsize(dp, block, &sfh)) >
1006             XFS_IFORK_DSIZE(dp)) {
1007                 error = 0;
1008                 goto out;
1009         }
1010         return xfs_dir2_block_to_sf(args, dbp, size, &sfh);
1011 out:
1012         if (lbp)
1013                 xfs_da_buf_done(lbp);
1014         if (dbp)
1015                 xfs_da_buf_done(dbp);
1016         return error;
1017 }
1018
1019 /*
1020  * Convert the shortform directory to block form.
1021  */
1022 int                                             /* error */
1023 xfs_dir2_sf_to_block(
1024         xfs_da_args_t           *args)          /* operation arguments */
1025 {
1026         xfs_dir2_db_t           blkno;          /* dir-relative block # (0) */
1027         xfs_dir2_block_t        *block;         /* block structure */
1028         xfs_dir2_leaf_entry_t   *blp;           /* block leaf entries */
1029         xfs_dabuf_t             *bp;            /* block buffer */
1030         xfs_dir2_block_tail_t   *btp;           /* block tail pointer */
1031         char                    *buf;           /* sf buffer */
1032         int                     buf_len;
1033         xfs_dir2_data_entry_t   *dep;           /* data entry pointer */
1034         xfs_inode_t             *dp;            /* incore directory inode */
1035         int                     dummy;          /* trash */
1036         xfs_dir2_data_unused_t  *dup;           /* unused entry pointer */
1037         int                     endoffset;      /* end of data objects */
1038         int                     error;          /* error return value */
1039         int                     i;              /* index */
1040         xfs_mount_t             *mp;            /* filesystem mount point */
1041         int                     needlog;        /* need to log block header */
1042         int                     needscan;       /* need to scan block freespc */
1043         int                     newoffset;      /* offset from current entry */
1044         int                     offset;         /* target block offset */
1045         xfs_dir2_sf_entry_t     *sfep;          /* sf entry pointer */
1046         xfs_dir2_sf_t           *sfp;           /* shortform structure */
1047         __be16                  *tagp;          /* end of data entry */
1048         xfs_trans_t             *tp;            /* transaction pointer */
1049
1050         xfs_dir2_trace_args("sf_to_block", args);
1051         dp = args->dp;
1052         tp = args->trans;
1053         mp = dp->i_mount;
1054         ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
1055         /*
1056          * Bomb out if the shortform directory is way too short.
1057          */
1058         if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
1059                 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1060                 return XFS_ERROR(EIO);
1061         }
1062         ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
1063         ASSERT(dp->i_df.if_u1.if_data != NULL);
1064         sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1065         ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
1066         /*
1067          * Copy the directory into the stack buffer.
1068          * Then pitch the incore inode data so we can make extents.
1069          */
1070
1071         buf_len = dp->i_df.if_bytes;
1072         buf = kmem_alloc(dp->i_df.if_bytes, KM_SLEEP);
1073
1074         memcpy(buf, sfp, dp->i_df.if_bytes);
1075         xfs_idata_realloc(dp, -dp->i_df.if_bytes, XFS_DATA_FORK);
1076         dp->i_d.di_size = 0;
1077         xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1078         /*
1079          * Reset pointer - old sfp is gone.
1080          */
1081         sfp = (xfs_dir2_sf_t *)buf;
1082         /*
1083          * Add block 0 to the inode.
1084          */
1085         error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE, &blkno);
1086         if (error) {
1087                 kmem_free(buf, buf_len);
1088                 return error;
1089         }
1090         /*
1091          * Initialize the data block.
1092          */
1093         error = xfs_dir2_data_init(args, blkno, &bp);
1094         if (error) {
1095                 kmem_free(buf, buf_len);
1096                 return error;
1097         }
1098         block = bp->data;
1099         block->hdr.magic = cpu_to_be32(XFS_DIR2_BLOCK_MAGIC);
1100         /*
1101          * Compute size of block "tail" area.
1102          */
1103         i = (uint)sizeof(*btp) +
1104             (sfp->hdr.count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t);
1105         /*
1106          * The whole thing is initialized to free by the init routine.
1107          * Say we're using the leaf and tail area.
1108          */
1109         dup = (xfs_dir2_data_unused_t *)block->u;
1110         needlog = needscan = 0;
1111         xfs_dir2_data_use_free(tp, bp, dup, mp->m_dirblksize - i, i, &needlog,
1112                 &needscan);
1113         ASSERT(needscan == 0);
1114         /*
1115          * Fill in the tail.
1116          */
1117         btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
1118         btp->count = cpu_to_be32(sfp->hdr.count + 2);   /* ., .. */
1119         btp->stale = 0;
1120         blp = XFS_DIR2_BLOCK_LEAF_P(btp);
1121         endoffset = (uint)((char *)blp - (char *)block);
1122         /*
1123          * Remove the freespace, we'll manage it.
1124          */
1125         xfs_dir2_data_use_free(tp, bp, dup,
1126                 (xfs_dir2_data_aoff_t)((char *)dup - (char *)block),
1127                 be16_to_cpu(dup->length), &needlog, &needscan);
1128         /*
1129          * Create entry for .
1130          */
1131         dep = (xfs_dir2_data_entry_t *)
1132               ((char *)block + XFS_DIR2_DATA_DOT_OFFSET);
1133         INT_SET(dep->inumber, ARCH_CONVERT, dp->i_ino);
1134         dep->namelen = 1;
1135         dep->name[0] = '.';
1136         tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep);
1137         *tagp = cpu_to_be16((char *)dep - (char *)block);
1138         xfs_dir2_data_log_entry(tp, bp, dep);
1139         blp[0].hashval = cpu_to_be32(xfs_dir_hash_dot);
1140         blp[0].address = cpu_to_be32(XFS_DIR2_BYTE_TO_DATAPTR(mp,
1141                                 (char *)dep - (char *)block));
1142         /*
1143          * Create entry for ..
1144          */
1145         dep = (xfs_dir2_data_entry_t *)
1146                 ((char *)block + XFS_DIR2_DATA_DOTDOT_OFFSET);
1147         INT_SET(dep->inumber, ARCH_CONVERT, XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent));
1148         dep->namelen = 2;
1149         dep->name[0] = dep->name[1] = '.';
1150         tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep);
1151         *tagp = cpu_to_be16((char *)dep - (char *)block);
1152         xfs_dir2_data_log_entry(tp, bp, dep);
1153         blp[1].hashval = cpu_to_be32(xfs_dir_hash_dotdot);
1154         blp[1].address = cpu_to_be32(XFS_DIR2_BYTE_TO_DATAPTR(mp,
1155                                 (char *)dep - (char *)block));
1156         offset = XFS_DIR2_DATA_FIRST_OFFSET;
1157         /*
1158          * Loop over existing entries, stuff them in.
1159          */
1160         if ((i = 0) == sfp->hdr.count)
1161                 sfep = NULL;
1162         else
1163                 sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
1164         /*
1165          * Need to preserve the existing offset values in the sf directory.
1166          * Insert holes (unused entries) where necessary.
1167          */
1168         while (offset < endoffset) {
1169                 /*
1170                  * sfep is null when we reach the end of the list.
1171                  */
1172                 if (sfep == NULL)
1173                         newoffset = endoffset;
1174                 else
1175                         newoffset = XFS_DIR2_SF_GET_OFFSET(sfep);
1176                 /*
1177                  * There should be a hole here, make one.
1178                  */
1179                 if (offset < newoffset) {
1180                         dup = (xfs_dir2_data_unused_t *)
1181                               ((char *)block + offset);
1182                         dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
1183                         dup->length = cpu_to_be16(newoffset - offset);
1184                         *XFS_DIR2_DATA_UNUSED_TAG_P(dup) = cpu_to_be16(
1185                                 ((char *)dup - (char *)block));
1186                         xfs_dir2_data_log_unused(tp, bp, dup);
1187                         (void)xfs_dir2_data_freeinsert((xfs_dir2_data_t *)block,
1188                                 dup, &dummy);
1189                         offset += be16_to_cpu(dup->length);
1190                         continue;
1191                 }
1192                 /*
1193                  * Copy a real entry.
1194                  */
1195                 dep = (xfs_dir2_data_entry_t *)((char *)block + newoffset);
1196                 INT_SET(dep->inumber, ARCH_CONVERT, XFS_DIR2_SF_GET_INUMBER(sfp,
1197                                 XFS_DIR2_SF_INUMBERP(sfep)));
1198                 dep->namelen = sfep->namelen;
1199                 memcpy(dep->name, sfep->name, dep->namelen);
1200                 tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep);
1201                 *tagp = cpu_to_be16((char *)dep - (char *)block);
1202                 xfs_dir2_data_log_entry(tp, bp, dep);
1203                 blp[2 + i].hashval = cpu_to_be32(xfs_da_hashname(
1204                                         (char *)sfep->name, sfep->namelen));
1205                 blp[2 + i].address = cpu_to_be32(XFS_DIR2_BYTE_TO_DATAPTR(mp,
1206                                                  (char *)dep - (char *)block));
1207                 offset = (int)((char *)(tagp + 1) - (char *)block);
1208                 if (++i == sfp->hdr.count)
1209                         sfep = NULL;
1210                 else
1211                         sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep);
1212         }
1213         /* Done with the temporary buffer */
1214         kmem_free(buf, buf_len);
1215         /*
1216          * Sort the leaf entries by hash value.
1217          */
1218         xfs_sort(blp, be32_to_cpu(btp->count), sizeof(*blp), xfs_dir2_block_sort);
1219         /*
1220          * Log the leaf entry area and tail.
1221          * Already logged the header in data_init, ignore needlog.
1222          */
1223         ASSERT(needscan == 0);
1224         xfs_dir2_block_log_leaf(tp, bp, 0, be32_to_cpu(btp->count) - 1);
1225         xfs_dir2_block_log_tail(tp, bp);
1226         xfs_dir2_data_check(dp, bp);
1227         xfs_da_buf_done(bp);
1228         return 0;
1229 }