fs/xfs/xfs_dir2_leaf.c

   1 /*
   2  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   3  * Copyright (c) 2013 Red Hat, Inc.
   4  * All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it would be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write the Free Software Foundation,
  17  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19 #include "xfs.h"
  20 #include "xfs_fs.h"
  21 #include "xfs_types.h"
  22 #include "xfs_bit.h"
  23 #include "xfs_log.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_mount.h"
  28 #include "xfs_da_btree.h"
  29 #include "xfs_bmap_btree.h"
  30 #include "xfs_dinode.h"
  31 #include "xfs_inode.h"
  32 #include "xfs_bmap.h"
  33 #include "xfs_dir2_format.h"
  34 #include "xfs_dir2_priv.h"
  35 #include "xfs_error.h"
  36 #include "xfs_trace.h"
  37 #include "xfs_buf_item.h"
  38 #include "xfs_cksum.h"
  39
  40 /*
  41  * Local function declarations.
  42  */
  43 static int xfs_dir2_leaf_lookup_int(xfs_da_args_t *args, struct xfs_buf **lbpp,
  44                                     int *indexp, struct xfs_buf **dbpp);
  45 static void xfs_dir3_leaf_log_bests(struct xfs_trans *tp, struct xfs_buf *bp,
  46                                     int first, int last);
  47 static void xfs_dir3_leaf_log_tail(struct xfs_trans *tp, struct xfs_buf *bp);
  48
  49 /*
  50  * Check the internal consistency of a leaf1 block.
  51  * Pop an assert if something is wrong.
  52  */
  53 #ifdef DEBUG
  54 #define xfs_dir3_leaf_check(mp, bp) \
  55 do { \
  56         if (!xfs_dir3_leaf1_check((mp), (bp))) \
  57                 ASSERT(0); \
  58 } while (0);
  59
  60 STATIC bool
  61 xfs_dir3_leaf1_check(
  62         struct xfs_mount        *mp,
  63         struct xfs_buf          *bp)
  64 {
  65         struct xfs_dir2_leaf    *leaf = bp->b_addr;
  66         struct xfs_dir3_icleaf_hdr leafhdr;
  67
  68         xfs_dir3_leaf_hdr_from_disk(&leafhdr, leaf);
  69
  70         if (leafhdr.magic == XFS_DIR3_LEAF1_MAGIC) {
  71                 struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr;
  72                 if (be64_to_cpu(leaf3->info.blkno) != bp->b_bn)
  73                         return false;
  74         } else if (leafhdr.magic != XFS_DIR2_LEAF1_MAGIC)
  75                 return false;
  76
  77         return xfs_dir3_leaf_check_int(mp, &leafhdr, leaf);
  78 }
  79 #else
  80 #define xfs_dir3_leaf_check(mp, bp)
  81 #endif
  82
  83 void
  84 xfs_dir3_leaf_hdr_from_disk(
  85         struct xfs_dir3_icleaf_hdr      *to,
  86         struct xfs_dir2_leaf            *from)
  87 {
  88         if (from->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) ||
  89             from->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)) {
  90                 to->forw = be32_to_cpu(from->hdr.info.forw);
  91                 to->back = be32_to_cpu(from->hdr.info.back);
  92                 to->magic = be16_to_cpu(from->hdr.info.magic);
  93                 to->count = be16_to_cpu(from->hdr.count);
  94                 to->stale = be16_to_cpu(from->hdr.stale);
  95         } else {
  96                 struct xfs_dir3_leaf_hdr *hdr3 = (struct xfs_dir3_leaf_hdr *)from;
  97
  98                 to->forw = be32_to_cpu(hdr3->info.hdr.forw);
  99                 to->back = be32_to_cpu(hdr3->info.hdr.back);
 100                 to->magic = be16_to_cpu(hdr3->info.hdr.magic);
 101                 to->count = be16_to_cpu(hdr3->count);
 102                 to->stale = be16_to_cpu(hdr3->stale);
 103         }
 104
 105         ASSERT(to->magic == XFS_DIR2_LEAF1_MAGIC ||
 106                to->magic == XFS_DIR3_LEAF1_MAGIC ||
 107                to->magic == XFS_DIR2_LEAFN_MAGIC ||
 108                to->magic == XFS_DIR3_LEAFN_MAGIC);
 109 }
 110
 111 void
 112 xfs_dir3_leaf_hdr_to_disk(
 113         struct xfs_dir2_leaf            *to,
 114         struct xfs_dir3_icleaf_hdr      *from)
 115 {
 116         ASSERT(from->magic == XFS_DIR2_LEAF1_MAGIC ||
 117                from->magic == XFS_DIR3_LEAF1_MAGIC ||
 118                from->magic == XFS_DIR2_LEAFN_MAGIC ||
 119                from->magic == XFS_DIR3_LEAFN_MAGIC);
 120
 121         if (from->magic == XFS_DIR2_LEAF1_MAGIC ||
 122             from->magic == XFS_DIR2_LEAFN_MAGIC) {
 123                 to->hdr.info.forw = cpu_to_be32(from->forw);
 124                 to->hdr.info.back = cpu_to_be32(from->back);
 125                 to->hdr.info.magic = cpu_to_be16(from->magic);
 126                 to->hdr.count = cpu_to_be16(from->count);
 127                 to->hdr.stale = cpu_to_be16(from->stale);
 128         } else {
 129                 struct xfs_dir3_leaf_hdr *hdr3 = (struct xfs_dir3_leaf_hdr *)to;
 130
 131                 hdr3->info.hdr.forw = cpu_to_be32(from->forw);
 132                 hdr3->info.hdr.back = cpu_to_be32(from->back);
 133                 hdr3->info.hdr.magic = cpu_to_be16(from->magic);
 134                 hdr3->count = cpu_to_be16(from->count);
 135                 hdr3->stale = cpu_to_be16(from->stale);
 136         }
 137 }
 138
 139 bool
 140 xfs_dir3_leaf_check_int(
 141         struct xfs_mount        *mp,
 142         struct xfs_dir3_icleaf_hdr *hdr,
 143         struct xfs_dir2_leaf    *leaf)
 144 {
 145         struct xfs_dir2_leaf_entry *ents;
 146         xfs_dir2_leaf_tail_t    *ltp;
 147         int                     stale;
 148         int                     i;
 149
 150         ents = xfs_dir3_leaf_ents_p(leaf);
 151         ltp = xfs_dir2_leaf_tail_p(mp, leaf);
 152
 153         /*
 154          * XXX (dgc): This value is not restrictive enough.
 155          * Should factor in the size of the bests table as well.
 156          * We can deduce a value for that from di_size.
 157          */
 158         if (hdr->count > xfs_dir3_max_leaf_ents(mp, leaf))
 159                 return false;
 160
 161         /* Leaves and bests don't overlap in leaf format. */
 162         if ((hdr->magic == XFS_DIR2_LEAF1_MAGIC ||
 163              hdr->magic == XFS_DIR3_LEAF1_MAGIC) &&
 164             (char *)&ents[hdr->count] > (char *)xfs_dir2_leaf_bests_p(ltp))
 165                 return false;
 166
 167         /* Check hash value order, count stale entries.  */
 168         for (i = stale = 0; i < hdr->count; i++) {
 169                 if (i + 1 < hdr->count) {
 170                         if (be32_to_cpu(ents[i].hashval) >
 171                                         be32_to_cpu(ents[i + 1].hashval))
 172                                 return false;
 173                 }
 174                 if (ents[i].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
 175                         stale++;
 176         }
 177         if (hdr->stale != stale)
 178                 return false;
 179         return true;
 180 }
 181
 182 static bool
 183 xfs_dir3_leaf_verify(
 184         struct xfs_buf          *bp,
 185         __uint16_t              magic)
 186 {
 187         struct xfs_mount        *mp = bp->b_target->bt_mount;
 188         struct xfs_dir2_leaf    *leaf = bp->b_addr;
 189         struct xfs_dir3_icleaf_hdr leafhdr;
 190
 191         ASSERT(magic == XFS_DIR2_LEAF1_MAGIC || magic == XFS_DIR2_LEAFN_MAGIC);
 192
 193         xfs_dir3_leaf_hdr_from_disk(&leafhdr, leaf);
 194         if (xfs_sb_version_hascrc(&mp->m_sb)) {
 195                 struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr;
 196
 197                 if ((magic == XFS_DIR2_LEAF1_MAGIC &&
 198                      leafhdr.magic != XFS_DIR3_LEAF1_MAGIC) ||
 199                     (magic == XFS_DIR2_LEAFN_MAGIC &&
 200                      leafhdr.magic != XFS_DIR3_LEAFN_MAGIC))
 201                         return false;
 202
 203                 if (!uuid_equal(&leaf3->info.uuid, &mp->m_sb.sb_uuid))
 204                         return false;
 205                 if (be64_to_cpu(leaf3->info.blkno) != bp->b_bn)
 206                         return false;
 207         } else {
 208                 if (leafhdr.magic != magic)
 209                         return false;
 210         }
 211         return xfs_dir3_leaf_check_int(mp, &leafhdr, leaf);
 212 }
 213
 214 static void
 215 __read_verify(
 216         struct xfs_buf  *bp,
 217         __uint16_t      magic)
 218 {
 219         struct xfs_mount        *mp = bp->b_target->bt_mount;
 220
 221         if ((xfs_sb_version_hascrc(&mp->m_sb) &&
 222              !xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length),
 223                                           XFS_DIR3_LEAF_CRC_OFF)) ||
 224             !xfs_dir3_leaf_verify(bp, magic)) {
 225                 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
 226                 xfs_buf_ioerror(bp, EFSCORRUPTED);
 227         }
 228 }
 229
 230 static void
 231 __write_verify(
 232         struct xfs_buf  *bp,
 233         __uint16_t      magic)
 234 {
 235         struct xfs_mount        *mp = bp->b_target->bt_mount;
 236         struct xfs_buf_log_item *bip = bp->b_fspriv;
 237         struct xfs_dir3_leaf_hdr *hdr3 = bp->b_addr;
 238
 239         if (!xfs_dir3_leaf_verify(bp, magic)) {
 240                 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
 241                 xfs_buf_ioerror(bp, EFSCORRUPTED);
 242                 return;
 243         }
 244
 245         if (!xfs_sb_version_hascrc(&mp->m_sb))
 246                 return;
 247
 248         if (bip)
 249                 hdr3->info.lsn = cpu_to_be64(bip->bli_item.li_lsn);
 250
 251         xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), XFS_DIR3_LEAF_CRC_OFF);
 252 }
 253
 254 static void
 255 xfs_dir3_leaf1_read_verify(
 256         struct xfs_buf  *bp)
 257 {
 258         __read_verify(bp, XFS_DIR2_LEAF1_MAGIC);
 259 }
 260
 261 static void
 262 xfs_dir3_leaf1_write_verify(
 263         struct xfs_buf  *bp)
 264 {
 265         __write_verify(bp, XFS_DIR2_LEAF1_MAGIC);
 266 }
 267
 268 static void
 269 xfs_dir3_leafn_read_verify(
 270         struct xfs_buf  *bp)
 271 {
 272         __read_verify(bp, XFS_DIR2_LEAFN_MAGIC);
 273 }
 274
 275 static void
 276 xfs_dir3_leafn_write_verify(
 277         struct xfs_buf  *bp)
 278 {
 279         __write_verify(bp, XFS_DIR2_LEAFN_MAGIC);
 280 }
 281
 282 const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops = {
 283         .verify_read = xfs_dir3_leaf1_read_verify,
 284         .verify_write = xfs_dir3_leaf1_write_verify,
 285 };
 286
 287 const struct xfs_buf_ops xfs_dir3_leafn_buf_ops = {
 288         .verify_read = xfs_dir3_leafn_read_verify,
 289         .verify_write = xfs_dir3_leafn_write_verify,
 290 };
 291
 292 static int
 293 xfs_dir3_leaf_read(
 294         struct xfs_trans        *tp,
 295         struct xfs_inode        *dp,
 296         xfs_dablk_t             fbno,
 297         xfs_daddr_t             mappedbno,
 298         struct xfs_buf          **bpp)
 299 {
 300         int                     err;
 301
 302         err = xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp,
 303                                 XFS_DATA_FORK, &xfs_dir3_leaf1_buf_ops);
 304         if (!err && tp)
 305                 xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_LEAF1_BUF);
 306         return err;
 307 }
 308
 309 int
 310 xfs_dir3_leafn_read(
 311         struct xfs_trans        *tp,
 312         struct xfs_inode        *dp,
 313         xfs_dablk_t             fbno,
 314         xfs_daddr_t             mappedbno,
 315         struct xfs_buf          **bpp)
 316 {
 317         int                     err;
 318
 319         err = xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp,
 320                                 XFS_DATA_FORK, &xfs_dir3_leafn_buf_ops);
 321         if (!err && tp)
 322                 xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_LEAFN_BUF);
 323         return err;
 324 }
 325
 326 /*
 327  * Initialize a new leaf block, leaf1 or leafn magic accepted.
 328  */
 329 static void
 330 xfs_dir3_leaf_init(
 331         struct xfs_mount        *mp,
 332         struct xfs_trans        *tp,
 333         struct xfs_buf          *bp,
 334         xfs_ino_t               owner,
 335         __uint16_t              type)
 336 {
 337         struct xfs_dir2_leaf    *leaf = bp->b_addr;
 338
 339         ASSERT(type == XFS_DIR2_LEAF1_MAGIC || type == XFS_DIR2_LEAFN_MAGIC);
 340
 341         if (xfs_sb_version_hascrc(&mp->m_sb)) {
 342                 struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr;
 343
 344                 memset(leaf3, 0, sizeof(*leaf3));
 345
 346                 leaf3->info.hdr.magic = (type == XFS_DIR2_LEAF1_MAGIC)
 347                                          ? cpu_to_be16(XFS_DIR3_LEAF1_MAGIC)
 348                                          : cpu_to_be16(XFS_DIR3_LEAFN_MAGIC);
 349                 leaf3->info.blkno = cpu_to_be64(bp->b_bn);
 350                 leaf3->info.owner = cpu_to_be64(owner);
 351                 uuid_copy(&leaf3->info.uuid, &mp->m_sb.sb_uuid);
 352         } else {
 353                 memset(leaf, 0, sizeof(*leaf));
 354                 leaf->hdr.info.magic = cpu_to_be16(type);
 355         }
 356
 357         /*
 358          * If it's a leaf-format directory initialize the tail.
 359          * Caller is responsible for initialising the bests table.
 360          */
 361         if (type == XFS_DIR2_LEAF1_MAGIC) {
 362                 struct xfs_dir2_leaf_tail *ltp;
 363
 364                 ltp = xfs_dir2_leaf_tail_p(mp, leaf);
 365                 ltp->bestcount = 0;
 366                 bp->b_ops = &xfs_dir3_leaf1_buf_ops;
 367                 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_LEAF1_BUF);
 368         } else {
 369                 bp->b_ops = &xfs_dir3_leafn_buf_ops;
 370                 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_LEAFN_BUF);
 371         }
 372 }
 373
 374 int
 375 xfs_dir3_leaf_get_buf(
 376         xfs_da_args_t           *args,
 377         xfs_dir2_db_t           bno,
 378         struct xfs_buf          **bpp,
 379         __uint16_t              magic)
 380 {
 381         struct xfs_inode        *dp = args->dp;
 382         struct xfs_trans        *tp = args->trans;
 383         struct xfs_mount        *mp = dp->i_mount;
 384         struct xfs_buf          *bp;
 385         int                     error;
 386
 387         ASSERT(magic == XFS_DIR2_LEAF1_MAGIC || magic == XFS_DIR2_LEAFN_MAGIC);
 388         ASSERT(bno >= XFS_DIR2_LEAF_FIRSTDB(mp) &&
 389                bno < XFS_DIR2_FREE_FIRSTDB(mp));
 390
 391         error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(mp, bno), -1, &bp,
 392                                XFS_DATA_FORK);
 393         if (error)
 394                 return error;
 395
 396         xfs_dir3_leaf_init(mp, tp, bp, dp->i_ino, magic);
 397         xfs_dir3_leaf_log_header(tp, bp);
 398         if (magic == XFS_DIR2_LEAF1_MAGIC)
 399                 xfs_dir3_leaf_log_tail(tp, bp);
 400         *bpp = bp;
 401         return 0;
 402 }
 403
 404 /*
 405  * Convert a block form directory to a leaf form directory.
 406  */
 407 int                                             /* error */
 408 xfs_dir2_block_to_leaf(
 409         xfs_da_args_t           *args,          /* operation arguments */
 410         struct xfs_buf          *dbp)           /* input block's buffer */
 411 {
 412         __be16                  *bestsp;        /* leaf's bestsp entries */
 413         xfs_dablk_t             blkno;          /* leaf block's bno */
 414         xfs_dir2_data_hdr_t     *hdr;           /* block header */
 415         xfs_dir2_leaf_entry_t   *blp;           /* block's leaf entries */
 416         xfs_dir2_block_tail_t   *btp;           /* block's tail */
 417         xfs_inode_t             *dp;            /* incore directory inode */
 418         int                     error;          /* error return code */
 419         struct xfs_buf          *lbp;           /* leaf block's buffer */
 420         xfs_dir2_db_t           ldb;            /* leaf block's bno */
 421         xfs_dir2_leaf_t         *leaf;          /* leaf structure */
 422         xfs_dir2_leaf_tail_t    *ltp;           /* leaf's tail */
 423         xfs_mount_t             *mp;            /* filesystem mount point */
 424         int                     needlog;        /* need to log block header */
 425         int                     needscan;       /* need to rescan bestfree */
 426         xfs_trans_t             *tp;            /* transaction pointer */
 427         struct xfs_dir2_data_free *bf;
 428         struct xfs_dir2_leaf_entry *ents;
 429         struct xfs_dir3_icleaf_hdr leafhdr;
 430
 431         trace_xfs_dir2_block_to_leaf(args);
 432
 433         dp = args->dp;
 434         mp = dp->i_mount;
 435         tp = args->trans;
 436         /*
 437          * Add the leaf block to the inode.
 438          * This interface will only put blocks in the leaf/node range.
 439          * Since that's empty now, we'll get the root (block 0 in range).
 440          */
 441         if ((error = xfs_da_grow_inode(args, &blkno))) {
 442                 return error;
 443         }
 444         ldb = xfs_dir2_da_to_db(mp, blkno);
 445         ASSERT(ldb == XFS_DIR2_LEAF_FIRSTDB(mp));
 446         /*
 447          * Initialize the leaf block, get a buffer for it.
 448          */
 449         error = xfs_dir3_leaf_get_buf(args, ldb, &lbp, XFS_DIR2_LEAF1_MAGIC);
 450         if (error)
 451                 return error;
 452
 453         leaf = lbp->b_addr;
 454         hdr = dbp->b_addr;
 455         xfs_dir3_data_check(dp, dbp);
 456         btp = xfs_dir2_block_tail_p(mp, hdr);
 457         blp = xfs_dir2_block_leaf_p(btp);
 458         bf = xfs_dir3_data_bestfree_p(hdr);
 459         ents = xfs_dir3_leaf_ents_p(leaf);
 460
 461         /*
 462          * Set the counts in the leaf header.
 463          */
 464         xfs_dir3_leaf_hdr_from_disk(&leafhdr, leaf);
 465         leafhdr.count = be32_to_cpu(btp->count);
 466         leafhdr.stale = be32_to_cpu(btp->stale);
 467         xfs_dir3_leaf_hdr_to_disk(leaf, &leafhdr);
 468         xfs_dir3_leaf_log_header(tp, lbp);
 469
 470         /*
 471          * Could compact these but I think we always do the conversion
 472          * after squeezing out stale entries.
 473          */
 474         memcpy(ents, blp, be32_to_cpu(btp->count) * sizeof(xfs_dir2_leaf_entry_t));
 475         xfs_dir3_leaf_log_ents(tp, lbp, 0, leafhdr.count - 1);
 476         needscan = 0;
 477         needlog = 1;
 478         /*
 479          * Make the space formerly occupied by the leaf entries and block
 480          * tail be free.
 481          */
 482         xfs_dir2_data_make_free(tp, dbp,
 483                 (xfs_dir2_data_aoff_t)((char *)blp - (char *)hdr),
 484                 (xfs_dir2_data_aoff_t)((char *)hdr + mp->m_dirblksize -
 485                                        (char *)blp),
 486                 &needlog, &needscan);
 487         /*
 488          * Fix up the block header, make it a data block.
 489          */
 490         dbp->b_ops = &xfs_dir3_data_buf_ops;
 491         xfs_trans_buf_set_type(tp, dbp, XFS_BLFT_DIR_DATA_BUF);
 492         if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC))
 493                 hdr->magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC);
 494         else
 495                 hdr->magic = cpu_to_be32(XFS_DIR3_DATA_MAGIC);
 496
 497         if (needscan)
 498                 xfs_dir2_data_freescan(mp, hdr, &needlog);
 499         /*
 500          * Set up leaf tail and bests table.
 501          */
 502         ltp = xfs_dir2_leaf_tail_p(mp, leaf);
 503         ltp->bestcount = cpu_to_be32(1);
 504         bestsp = xfs_dir2_leaf_bests_p(ltp);
 505         bestsp[0] =  bf[0].length;
 506         /*
 507          * Log the data header and leaf bests table.
 508          */
 509         if (needlog)
 510                 xfs_dir2_data_log_header(tp, dbp);
 511         xfs_dir3_leaf_check(mp, lbp);
 512         xfs_dir3_data_check(dp, dbp);
 513         xfs_dir3_leaf_log_bests(tp, lbp, 0, 0);
 514         return 0;
 515 }
 516
 517 STATIC void
 518 xfs_dir3_leaf_find_stale(
 519         struct xfs_dir3_icleaf_hdr *leafhdr,
 520         struct xfs_dir2_leaf_entry *ents,
 521         int                     index,
 522         int                     *lowstale,
 523         int                     *highstale)
 524 {
 525         /*
 526          * Find the first stale entry before our index, if any.
 527          */
 528         for (*lowstale = index - 1; *lowstale >= 0; --*lowstale) {
 529                 if (ents[*lowstale].address ==
 530                     cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
 531                         break;
 532         }
 533
 534         /*
 535          * Find the first stale entry at or after our index, if any.
 536          * Stop if the result would require moving more entries than using
 537          * lowstale.
 538          */
 539         for (*highstale = index; *highstale < leafhdr->count; ++*highstale) {
 540                 if (ents[*highstale].address ==
 541                     cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
 542                         break;
 543                 if (*lowstale >= 0 && index - *lowstale <= *highstale - index)
 544                         break;
 545         }
 546 }
 547
 548 struct xfs_dir2_leaf_entry *
 549 xfs_dir3_leaf_find_entry(
 550         struct xfs_dir3_icleaf_hdr *leafhdr,
 551         struct xfs_dir2_leaf_entry *ents,
 552         int                     index,          /* leaf table position */
 553         int                     compact,        /* need to compact leaves */
 554         int                     lowstale,       /* index of prev stale leaf */
 555         int                     highstale,      /* index of next stale leaf */
 556         int                     *lfloglow,      /* low leaf logging index */
 557         int                     *lfloghigh)     /* high leaf logging index */
 558 {
 559         if (!leafhdr->stale) {
 560                 xfs_dir2_leaf_entry_t   *lep;   /* leaf entry table pointer */
 561
 562                 /*
 563                  * Now we need to make room to insert the leaf entry.
 564                  *
 565                  * If there are no stale entries, just insert a hole at index.
 566                  */
 567                 lep = &ents[index];
 568                 if (index < leafhdr->count)
 569                         memmove(lep + 1, lep,
 570                                 (leafhdr->count - index) * sizeof(*lep));
 571
 572                 /*
 573                  * Record low and high logging indices for the leaf.
 574                  */
 575                 *lfloglow = index;
 576                 *lfloghigh = leafhdr->count++;
 577                 return lep;
 578         }
 579
 580         /*
 581          * There are stale entries.
 582          *
 583          * We will use one of them for the new entry.  It's probably not at
 584          * the right location, so we'll have to shift some up or down first.
 585          *
 586          * If we didn't compact before, we need to find the nearest stale
 587          * entries before and after our insertion point.
 588          */
 589         if (compact == 0)
 590                 xfs_dir3_leaf_find_stale(leafhdr, ents, index,
 591                                          &lowstale, &highstale);
 592
 593         /*
 594          * If the low one is better, use it.
 595          */
 596         if (lowstale >= 0 &&
 597             (highstale == leafhdr->count ||
 598              index - lowstale - 1 < highstale - index)) {
 599                 ASSERT(index - lowstale - 1 >= 0);
 600                 ASSERT(ents[lowstale].address ==
 601                        cpu_to_be32(XFS_DIR2_NULL_DATAPTR));
 602
 603                 /*
 604                  * Copy entries up to cover the stale entry and make room
 605                  * for the new entry.
 606                  */
 607                 if (index - lowstale - 1 > 0) {
 608                         memmove(&ents[lowstale], &ents[lowstale + 1],
 609                                 (index - lowstale - 1) *
 610                                         sizeof(xfs_dir2_leaf_entry_t));
 611                 }
 612                 *lfloglow = MIN(lowstale, *lfloglow);
 613                 *lfloghigh = MAX(index - 1, *lfloghigh);
 614                 leafhdr->stale--;
 615                 return &ents[index - 1];
 616         }
 617
 618         /*
 619          * The high one is better, so use that one.
 620          */
 621         ASSERT(highstale - index >= 0);
 622         ASSERT(ents[highstale].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR));
 623
 624         /*
 625          * Copy entries down to cover the stale entry and make room for the
 626          * new entry.
 627          */
 628         if (highstale - index > 0) {
 629                 memmove(&ents[index + 1], &ents[index],
 630                         (highstale - index) * sizeof(xfs_dir2_leaf_entry_t));
 631         }
 632         *lfloglow = MIN(index, *lfloglow);
 633         *lfloghigh = MAX(highstale, *lfloghigh);
 634         leafhdr->stale--;
 635         return &ents[index];
 636 }
 637
 638 /*
 639  * Add an entry to a leaf form directory.
 640  */
 641 int                                             /* error */
 642 xfs_dir2_leaf_addname(
 643         xfs_da_args_t           *args)          /* operation arguments */
 644 {
 645         __be16                  *bestsp;        /* freespace table in leaf */
 646         int                     compact;        /* need to compact leaves */
 647         xfs_dir2_data_hdr_t     *hdr;           /* data block header */
 648         struct xfs_buf          *dbp;           /* data block buffer */
 649         xfs_dir2_data_entry_t   *dep;           /* data block entry */
 650         xfs_inode_t             *dp;            /* incore directory inode */
 651         xfs_dir2_data_unused_t  *dup;           /* data unused entry */
 652         int                     error;          /* error return value */
 653         int                     grown;          /* allocated new data block */
 654         int                     highstale;      /* index of next stale leaf */
 655         int                     i;              /* temporary, index */
 656         int                     index;          /* leaf table position */
 657         struct xfs_buf          *lbp;           /* leaf's buffer */
 658         xfs_dir2_leaf_t         *leaf;          /* leaf structure */
 659         int                     length;         /* length of new entry */
 660         xfs_dir2_leaf_entry_t   *lep;           /* leaf entry table pointer */
 661         int                     lfloglow;       /* low leaf logging index */
 662         int                     lfloghigh;      /* high leaf logging index */
 663         int                     lowstale;       /* index of prev stale leaf */
 664         xfs_dir2_leaf_tail_t    *ltp;           /* leaf tail pointer */
 665         xfs_mount_t             *mp;            /* filesystem mount point */
 666         int                     needbytes;      /* leaf block bytes needed */
 667         int                     needlog;        /* need to log data header */
 668         int                     needscan;       /* need to rescan data free */
 669         __be16                  *tagp;          /* end of data entry */
 670         xfs_trans_t             *tp;            /* transaction pointer */
 671         xfs_dir2_db_t           use_block;      /* data block number */
 672         struct xfs_dir2_data_free *bf;          /* bestfree table */
 673         struct xfs_dir2_leaf_entry *ents;
 674         struct xfs_dir3_icleaf_hdr leafhdr;
 675
 676         trace_xfs_dir2_leaf_addname(args);
 677
 678         dp = args->dp;
 679         tp = args->trans;
 680         mp = dp->i_mount;
 681
 682         error = xfs_dir3_leaf_read(tp, dp, mp->m_dirleafblk, -1, &lbp);
 683         if (error)
 684                 return error;
 685
 686         /*
 687          * Look up the entry by hash value and name.
 688          * We know it's not there, our caller has already done a lookup.
 689          * So the index is of the entry to insert in front of.
 690          * But if there are dup hash values the index is of the first of those.
 691          */
 692         index = xfs_dir2_leaf_search_hash(args, lbp);
 693         leaf = lbp->b_addr;
 694         ltp = xfs_dir2_leaf_tail_p(mp, leaf);
 695         ents = xfs_dir3_leaf_ents_p(leaf);
 696         xfs_dir3_leaf_hdr_from_disk(&leafhdr, leaf);
 697         bestsp = xfs_dir2_leaf_bests_p(ltp);
 698         length = xfs_dir2_data_entsize(args->namelen);
 699
 700         /*
 701          * See if there are any entries with the same hash value
 702          * and space in their block for the new entry.
 703          * This is good because it puts multiple same-hash value entries
 704          * in a data block, improving the lookup of those entries.
 705          */
 706         for (use_block = -1, lep = &ents[index];
 707              index < leafhdr.count && be32_to_cpu(lep->hashval) == args->hashval;
 708              index++, lep++) {
 709                 if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR)
 710                         continue;
 711                 i = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address));
 712                 ASSERT(i < be32_to_cpu(ltp->bestcount));
 713                 ASSERT(bestsp[i] != cpu_to_be16(NULLDATAOFF));
 714                 if (be16_to_cpu(bestsp[i]) >= length) {
 715                         use_block = i;
 716                         break;
 717                 }
 718         }
 719         /*
 720          * Didn't find a block yet, linear search all the data blocks.
 721          */
 722         if (use_block == -1) {
 723                 for (i = 0; i < be32_to_cpu(ltp->bestcount); i++) {
 724                         /*
 725                          * Remember a block we see that's missing.
 726                          */
 727                         if (bestsp[i] == cpu_to_be16(NULLDATAOFF) &&
 728                             use_block == -1)
 729                                 use_block = i;
 730                         else if (be16_to_cpu(bestsp[i]) >= length) {
 731                                 use_block = i;
 732                                 break;
 733                         }
 734                 }
 735         }
 736         /*
 737          * How many bytes do we need in the leaf block?
 738          */
 739         needbytes = 0;
 740         if (!leafhdr.stale)
 741                 needbytes += sizeof(xfs_dir2_leaf_entry_t);
 742         if (use_block == -1)
 743                 needbytes += sizeof(xfs_dir2_data_off_t);
 744
 745         /*
 746          * Now kill use_block if it refers to a missing block, so we
 747          * can use it as an indication of allocation needed.
 748          */
 749         if (use_block != -1 && bestsp[use_block] == cpu_to_be16(NULLDATAOFF))
 750                 use_block = -1;
 751         /*
 752          * If we don't have enough free bytes but we can make enough
 753          * by compacting out stale entries, we'll do that.
 754          */
 755         if ((char *)bestsp - (char *)&ents[leafhdr.count] < needbytes &&
 756             leafhdr.stale > 1)
 757                 compact = 1;
 758
 759         /*
 760          * Otherwise if we don't have enough free bytes we need to
 761          * convert to node form.
 762          */
 763         else if ((char *)bestsp - (char *)&ents[leafhdr.count] < needbytes) {
 764                 /*
 765                  * Just checking or no space reservation, give up.
 766                  */
 767                 if ((args->op_flags & XFS_DA_OP_JUSTCHECK) ||
 768                                                         args->total == 0) {
 769                         xfs_trans_brelse(tp, lbp);
 770                         return XFS_ERROR(ENOSPC);
 771                 }
 772                 /*
 773                  * Convert to node form.
 774                  */
 775                 error = xfs_dir2_leaf_to_node(args, lbp);
 776                 if (error)
 777                         return error;
 778                 /*
 779                  * Then add the new entry.
 780                  */
 781                 return xfs_dir2_node_addname(args);
 782         }
 783         /*
 784          * Otherwise it will fit without compaction.
 785          */
 786         else
 787                 compact = 0;
 788         /*
 789          * If just checking, then it will fit unless we needed to allocate
 790          * a new data block.
 791          */
 792         if (args->op_flags & XFS_DA_OP_JUSTCHECK) {
 793                 xfs_trans_brelse(tp, lbp);
 794                 return use_block == -1 ? XFS_ERROR(ENOSPC) : 0;
 795         }
 796         /*
 797          * If no allocations are allowed, return now before we've
 798          * changed anything.
 799          */
 800         if (args->total == 0 && use_block == -1) {
 801                 xfs_trans_brelse(tp, lbp);
 802                 return XFS_ERROR(ENOSPC);
 803         }
 804         /*
 805          * Need to compact the leaf entries, removing stale ones.
 806          * Leave one stale entry behind - the one closest to our
 807          * insertion index - and we'll shift that one to our insertion
 808          * point later.
 809          */
 810         if (compact) {
 811                 xfs_dir3_leaf_compact_x1(&leafhdr, ents, &index, &lowstale,
 812                         &highstale, &lfloglow, &lfloghigh);
 813         }
 814         /*
 815          * There are stale entries, so we'll need log-low and log-high
 816          * impossibly bad values later.
 817          */
 818         else if (leafhdr.stale) {
 819                 lfloglow = leafhdr.count;
 820                 lfloghigh = -1;
 821         }
 822         /*
 823          * If there was no data block space found, we need to allocate
 824          * a new one.
 825          */
 826         if (use_block == -1) {
 827                 /*
 828                  * Add the new data block.
 829                  */
 830                 if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE,
 831                                 &use_block))) {
 832                         xfs_trans_brelse(tp, lbp);
 833                         return error;
 834                 }
 835                 /*
 836                  * Initialize the block.
 837                  */
 838                 if ((error = xfs_dir3_data_init(args, use_block, &dbp))) {
 839                         xfs_trans_brelse(tp, lbp);
 840                         return error;
 841                 }
 842                 /*
 843                  * If we're adding a new data block on the end we need to
 844                  * extend the bests table.  Copy it up one entry.
 845                  */
 846                 if (use_block >= be32_to_cpu(ltp->bestcount)) {
 847                         bestsp--;
 848                         memmove(&bestsp[0], &bestsp[1],
 849                                 be32_to_cpu(ltp->bestcount) * sizeof(bestsp[0]));
 850                         be32_add_cpu(&ltp->bestcount, 1);
 851                         xfs_dir3_leaf_log_tail(tp, lbp);
 852                         xfs_dir3_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1);
 853                 }
 854                 /*
 855                  * If we're filling in a previously empty block just log it.
 856                  */
 857                 else
 858                         xfs_dir3_leaf_log_bests(tp, lbp, use_block, use_block);
 859                 hdr = dbp->b_addr;
 860                 bf = xfs_dir3_data_bestfree_p(hdr);
 861                 bestsp[use_block] = bf[0].length;
 862                 grown = 1;
 863         } else {
 864                 /*
 865                  * Already had space in some data block.
 866                  * Just read that one in.
 867                  */
 868                 error = xfs_dir3_data_read(tp, dp,
 869                                            xfs_dir2_db_to_da(mp, use_block),
 870                                            -1, &dbp);
 871                 if (error) {
 872                         xfs_trans_brelse(tp, lbp);
 873                         return error;
 874                 }
 875                 hdr = dbp->b_addr;
 876                 bf = xfs_dir3_data_bestfree_p(hdr);
 877                 grown = 0;
 878         }
 879         /*
 880          * Point to the biggest freespace in our data block.
 881          */
 882         dup = (xfs_dir2_data_unused_t *)
 883               ((char *)hdr + be16_to_cpu(bf[0].offset));
 884         ASSERT(be16_to_cpu(dup->length) >= length);
 885         needscan = needlog = 0;
 886         /*
 887          * Mark the initial part of our freespace in use for the new entry.
 888          */
 889         xfs_dir2_data_use_free(tp, dbp, dup,
 890                 (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr), length,
 891                 &needlog, &needscan);
 892         /*
 893          * Initialize our new entry (at last).
 894          */
 895         dep = (xfs_dir2_data_entry_t *)dup;
 896         dep->inumber = cpu_to_be64(args->inumber);
 897         dep->namelen = args->namelen;
 898         memcpy(dep->name, args->name, dep->namelen);
 899         tagp = xfs_dir2_data_entry_tag_p(dep);
 900         *tagp = cpu_to_be16((char *)dep - (char *)hdr);
 901         /*
 902          * Need to scan fix up the bestfree table.
 903          */
 904         if (needscan)
 905                 xfs_dir2_data_freescan(mp, hdr, &needlog);
 906         /*
 907          * Need to log the data block's header.
 908          */
 909         if (needlog)
 910                 xfs_dir2_data_log_header(tp, dbp);
 911         xfs_dir2_data_log_entry(tp, dbp, dep);
 912         /*
 913          * If the bests table needs to be changed, do it.
 914          * Log the change unless we've already done that.
 915          */
 916         if (be16_to_cpu(bestsp[use_block]) != be16_to_cpu(bf[0].length)) {
 917                 bestsp[use_block] = bf[0].length;
 918                 if (!grown)
 919                         xfs_dir3_leaf_log_bests(tp, lbp, use_block, use_block);
 920         }
 921
 922         lep = xfs_dir3_leaf_find_entry(&leafhdr, ents, index, compact, lowstale,
 923                                        highstale, &lfloglow, &lfloghigh);
 924
 925         /*
 926          * Fill in the new leaf entry.
 927          */
 928         lep->hashval = cpu_to_be32(args->hashval);
 929         lep->address = cpu_to_be32(xfs_dir2_db_off_to_dataptr(mp, use_block,
 930                                 be16_to_cpu(*tagp)));
 931         /*
 932          * Log the leaf fields and give up the buffers.
 933          */
 934         xfs_dir3_leaf_hdr_to_disk(leaf, &leafhdr);
 935         xfs_dir3_leaf_log_header(tp, lbp);
 936         xfs_dir3_leaf_log_ents(tp, lbp, lfloglow, lfloghigh);
 937         xfs_dir3_leaf_check(mp, lbp);
 938         xfs_dir3_data_check(dp, dbp);
 939         return 0;
 940 }
 941
 942 /*
 943  * Compact out any stale entries in the leaf.
 944  * Log the header and changed leaf entries, if any.
 945  */
 946 void
 947 xfs_dir3_leaf_compact(
 948         xfs_da_args_t   *args,          /* operation arguments */
 949         struct xfs_dir3_icleaf_hdr *leafhdr,
 950         struct xfs_buf  *bp)            /* leaf buffer */
 951 {
 952         int             from;           /* source leaf index */
 953         xfs_dir2_leaf_t *leaf;          /* leaf structure */
 954         int             loglow;         /* first leaf entry to log */
 955         int             to;             /* target leaf index */
 956         struct xfs_dir2_leaf_entry *ents;
 957
 958         leaf = bp->b_addr;
 959         if (!leafhdr->stale)
 960                 return;
 961
 962         /*
 963          * Compress out the stale entries in place.
 964          */
 965         ents = xfs_dir3_leaf_ents_p(leaf);
 966         for (from = to = 0, loglow = -1; from < leafhdr->count; from++) {
 967                 if (ents[from].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
 968                         continue;
 969                 /*
 970                  * Only actually copy the entries that are different.
 971                  */
 972                 if (from > to) {
 973                         if (loglow == -1)
 974                                 loglow = to;
 975                         ents[to] = ents[from];
 976                 }
 977                 to++;
 978         }
 979         /*
 980          * Update and log the header, log the leaf entries.
 981          */
 982         ASSERT(leafhdr->stale == from - to);
 983         leafhdr->count -= leafhdr->stale;
 984         leafhdr->stale = 0;
 985
 986         xfs_dir3_leaf_hdr_to_disk(leaf, leafhdr);
 987         xfs_dir3_leaf_log_header(args->trans, bp);
 988         if (loglow != -1)
 989                 xfs_dir3_leaf_log_ents(args->trans, bp, loglow, to - 1);
 990 }
 991
 992 /*
 993  * Compact the leaf entries, removing stale ones.
 994  * Leave one stale entry behind - the one closest to our
 995  * insertion index - and the caller will shift that one to our insertion
 996  * point later.
 997  * Return new insertion index, where the remaining stale entry is,
 998  * and leaf logging indices.
 999  */
1000 void
1001 xfs_dir3_leaf_compact_x1(
1002         struct xfs_dir3_icleaf_hdr *leafhdr,
1003         struct xfs_dir2_leaf_entry *ents,
1004         int             *indexp,        /* insertion index */
1005         int             *lowstalep,     /* out: stale entry before us */
1006         int             *highstalep,    /* out: stale entry after us */
1007         int             *lowlogp,       /* out: low log index */
1008         int             *highlogp)      /* out: high log index */
1009 {
1010         int             from;           /* source copy index */
1011         int             highstale;      /* stale entry at/after index */
1012         int             index;          /* insertion index */
1013         int             keepstale;      /* source index of kept stale */
1014         int             lowstale;       /* stale entry before index */
1015         int             newindex=0;     /* new insertion index */
1016         int             to;             /* destination copy index */
1017
1018         ASSERT(leafhdr->stale > 1);
1019         index = *indexp;
1020
1021         xfs_dir3_leaf_find_stale(leafhdr, ents, index, &lowstale, &highstale);
1022
1023         /*
1024          * Pick the better of lowstale and highstale.
1025          */
1026         if (lowstale >= 0 &&
1027             (highstale == leafhdr->count ||
1028              index - lowstale <= highstale - index))
1029                 keepstale = lowstale;
1030         else
1031                 keepstale = highstale;
1032         /*
1033          * Copy the entries in place, removing all the stale entries
1034          * except keepstale.
1035          */
1036         for (from = to = 0; from < leafhdr->count; from++) {
1037                 /*
1038                  * Notice the new value of index.
1039                  */
1040                 if (index == from)
1041                         newindex = to;
1042                 if (from != keepstale &&
1043                     ents[from].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) {
1044                         if (from == to)
1045                                 *lowlogp = to;
1046                         continue;
1047                 }
1048                 /*
1049                  * Record the new keepstale value for the insertion.
1050                  */
1051                 if (from == keepstale)
1052                         lowstale = highstale = to;
1053                 /*
1054                  * Copy only the entries that have moved.
1055                  */
1056                 if (from > to)
1057                         ents[to] = ents[from];
1058                 to++;
1059         }
1060         ASSERT(from > to);
1061         /*
1062          * If the insertion point was past the last entry,
1063          * set the new insertion point accordingly.
1064          */
1065         if (index == from)
1066                 newindex = to;
1067         *indexp = newindex;
1068         /*
1069          * Adjust the leaf header values.
1070          */
1071         leafhdr->count -= from - to;
1072         leafhdr->stale = 1;
1073         /*
1074          * Remember the low/high stale value only in the "right"
1075          * direction.
1076          */
1077         if (lowstale >= newindex)
1078                 lowstale = -1;
1079         else
1080                 highstale = leafhdr->count;
1081         *highlogp = leafhdr->count - 1;
1082         *lowstalep = lowstale;
1083         *highstalep = highstale;
1084 }
1085
1086 struct xfs_dir2_leaf_map_info {
1087         xfs_extlen_t    map_blocks;     /* number of fsbs in map */
1088         xfs_dablk_t     map_off;        /* last mapped file offset */
1089         int             map_size;       /* total entries in *map */
1090         int             map_valid;      /* valid entries in *map */
1091         int             nmap;           /* mappings to ask xfs_bmapi */
1092         xfs_dir2_db_t   curdb;          /* db for current block */
1093         int             ra_current;     /* number of read-ahead blks */
1094         int             ra_index;       /* *map index for read-ahead */
1095         int             ra_offset;      /* map entry offset for ra */
1096         int             ra_want;        /* readahead count wanted */
1097         struct xfs_bmbt_irec map[];     /* map vector for blocks */
1098 };
1099
1100 STATIC int
1101 xfs_dir2_leaf_readbuf(
1102         struct xfs_inode        *dp,
1103         size_t                  bufsize,
1104         struct xfs_dir2_leaf_map_info *mip,
1105         xfs_dir2_off_t          *curoff,
1106         struct xfs_buf          **bpp)
1107 {
1108         struct xfs_mount        *mp = dp->i_mount;
1109         struct xfs_buf          *bp = *bpp;
1110         struct xfs_bmbt_irec    *map = mip->map;
1111         int                     error = 0;
1112         int                     length;
1113         int                     i;
1114         int                     j;
1115
1116         /*
1117          * If we have a buffer, we need to release it and
1118          * take it out of the mapping.
1119          */
1120
1121         if (bp) {
1122                 xfs_trans_brelse(NULL, bp);
1123                 bp = NULL;
1124                 mip->map_blocks -= mp->m_dirblkfsbs;
1125                 /*
1126                  * Loop to get rid of the extents for the
1127                  * directory block.
1128                  */
1129                 for (i = mp->m_dirblkfsbs; i > 0; ) {
1130                         j = min_t(int, map->br_blockcount, i);
1131                         map->br_blockcount -= j;
1132                         map->br_startblock += j;
1133                         map->br_startoff += j;
1134                         /*
1135                          * If mapping is done, pitch it from
1136                          * the table.
1137                          */
1138                         if (!map->br_blockcount && --mip->map_valid)
1139                                 memmove(&map[0], &map[1],
1140                                         sizeof(map[0]) * mip->map_valid);
1141                         i -= j;
1142                 }
1143         }
1144
1145         /*
1146          * Recalculate the readahead blocks wanted.
1147          */
1148         mip->ra_want = howmany(bufsize + mp->m_dirblksize,
1149                                mp->m_sb.sb_blocksize) - 1;
1150         ASSERT(mip->ra_want >= 0);
1151
1152         /*
1153          * If we don't have as many as we want, and we haven't
1154          * run out of data blocks, get some more mappings.
1155          */
1156         if (1 + mip->ra_want > mip->map_blocks &&
1157             mip->map_off < xfs_dir2_byte_to_da(mp, XFS_DIR2_LEAF_OFFSET)) {
1158                 /*
1159                  * Get more bmaps, fill in after the ones
1160                  * we already have in the table.
1161                  */
1162                 mip->nmap = mip->map_size - mip->map_valid;
1163                 error = xfs_bmapi_read(dp, mip->map_off,
1164                                 xfs_dir2_byte_to_da(mp, XFS_DIR2_LEAF_OFFSET) -
1165                                                                 mip->map_off,
1166                                 &map[mip->map_valid], &mip->nmap, 0);
1167
1168                 /*
1169                  * Don't know if we should ignore this or try to return an
1170                  * error.  The trouble with returning errors is that readdir
1171                  * will just stop without actually passing the error through.
1172                  */
1173                 if (error)
1174                         goto out;       /* XXX */
1175
1176                 /*
1177                  * If we got all the mappings we asked for, set the final map
1178                  * offset based on the last bmap value received.  Otherwise,
1179                  * we've reached the end.
1180                  */
1181                 if (mip->nmap == mip->map_size - mip->map_valid) {
1182                         i = mip->map_valid + mip->nmap - 1;
1183                         mip->map_off = map[i].br_startoff + map[i].br_blockcount;
1184                 } else
1185                         mip->map_off = xfs_dir2_byte_to_da(mp,
1186                                                         XFS_DIR2_LEAF_OFFSET);
1187
1188                 /*
1189                  * Look for holes in the mapping, and eliminate them.  Count up
1190                  * the valid blocks.
1191                  */
1192                 for (i = mip->map_valid; i < mip->map_valid + mip->nmap; ) {
1193                         if (map[i].br_startblock == HOLESTARTBLOCK) {
1194                                 mip->nmap--;
1195                                 length = mip->map_valid + mip->nmap - i;
1196                                 if (length)
1197                                         memmove(&map[i], &map[i + 1],
1198                                                 sizeof(map[i]) * length);
1199                         } else {
1200                                 mip->map_blocks += map[i].br_blockcount;
1201                                 i++;
1202                         }
1203                 }
1204                 mip->map_valid += mip->nmap;
1205         }
1206
1207         /*
1208          * No valid mappings, so no more data blocks.
1209          */
1210         if (!mip->map_valid) {
1211                 *curoff = xfs_dir2_da_to_byte(mp, mip->map_off);
1212                 goto out;
1213         }
1214
1215         /*
1216          * Read the directory block starting at the first mapping.
1217          */
1218         mip->curdb = xfs_dir2_da_to_db(mp, map->br_startoff);
1219         error = xfs_dir3_data_read(NULL, dp, map->br_startoff,
1220                         map->br_blockcount >= mp->m_dirblkfsbs ?
1221                             XFS_FSB_TO_DADDR(mp, map->br_startblock) : -1, &bp);
1222
1223         /*
1224          * Should just skip over the data block instead of giving up.
1225          */
1226         if (error)
1227                 goto out;       /* XXX */
1228
1229         /*
1230          * Adjust the current amount of read-ahead: we just read a block that
1231          * was previously ra.
1232          */
1233         if (mip->ra_current)
1234                 mip->ra_current -= mp->m_dirblkfsbs;
1235
1236         /*
1237          * Do we need more readahead?
1238          */
1239         for (mip->ra_index = mip->ra_offset = i = 0;
1240              mip->ra_want > mip->ra_current && i < mip->map_blocks;
1241              i += mp->m_dirblkfsbs) {
1242                 ASSERT(mip->ra_index < mip->map_valid);
1243                 /*
1244                  * Read-ahead a contiguous directory block.
1245                  */
1246                 if (i > mip->ra_current &&
1247                     map[mip->ra_index].br_blockcount >= mp->m_dirblkfsbs) {
1248                         xfs_dir3_data_readahead(NULL, dp,
1249                                 map[mip->ra_index].br_startoff + mip->ra_offset,
1250                                 XFS_FSB_TO_DADDR(mp,
1251                                         map[mip->ra_index].br_startblock +
1252                                                         mip->ra_offset));
1253                         mip->ra_current = i;
1254                 }
1255
1256                 /*
1257                  * Read-ahead a non-contiguous directory block.  This doesn't
1258                  * use our mapping, but this is a very rare case.
1259                  */
1260                 else if (i > mip->ra_current) {
1261                         xfs_dir3_data_readahead(NULL, dp,
1262                                         map[mip->ra_index].br_startoff +
1263                                                         mip->ra_offset, -1);
1264                         mip->ra_current = i;
1265                 }
1266
1267                 /*
1268                  * Advance offset through the mapping table.
1269                  */
1270                 for (j = 0; j < mp->m_dirblkfsbs; j++) {
1271                         /*
1272                          * The rest of this extent but not more than a dir
1273                          * block.
1274                          */
1275                         length = min_t(int, mp->m_dirblkfsbs,
1276                                         map[mip->ra_index].br_blockcount -
1277                                                         mip->ra_offset);
1278                         j += length;
1279                         mip->ra_offset += length;
1280
1281                         /*
1282                          * Advance to the next mapping if this one is used up.
1283                          */
1284                         if (mip->ra_offset == map[mip->ra_index].br_blockcount) {
1285                                 mip->ra_offset = 0;
1286                                 mip->ra_index++;
1287                         }
1288                 }
1289         }
1290
1291 out:
1292         *bpp = bp;
1293         return error;
1294 }
1295
1296 /*
1297  * Getdents (readdir) for leaf and node directories.
1298  * This reads the data blocks only, so is the same for both forms.
1299  */
1300 int                                             /* error */
1301 xfs_dir2_leaf_getdents(
1302         xfs_inode_t             *dp,            /* incore directory inode */
1303         struct dir_context      *ctx,
1304         size_t                  bufsize)
1305 {
1306         struct xfs_buf          *bp = NULL;     /* data block buffer */
1307         xfs_dir2_data_hdr_t     *hdr;           /* data block header */
1308         xfs_dir2_data_entry_t   *dep;           /* data entry */
1309         xfs_dir2_data_unused_t  *dup;           /* unused entry */
1310         int                     error = 0;      /* error return value */
1311         int                     length;         /* temporary length value */
1312         xfs_mount_t             *mp;            /* filesystem mount point */
1313         int                     byteoff;        /* offset in current block */
1314         xfs_dir2_off_t          curoff;         /* current overall offset */
1315         xfs_dir2_off_t          newoff;         /* new curoff after new blk */
1316         char                    *ptr = NULL;    /* pointer to current data */
1317         struct xfs_dir2_leaf_map_info *map_info;
1318
1319         /*
1320          * If the offset is at or past the largest allowed value,
1321          * give up right away.
1322          */
1323         if (ctx->pos >= XFS_DIR2_MAX_DATAPTR)
1324                 return 0;
1325
1326         mp = dp->i_mount;
1327
1328         /*
1329          * Set up to bmap a number of blocks based on the caller's
1330          * buffer size, the directory block size, and the filesystem
1331          * block size.
1332          */
1333         length = howmany(bufsize + mp->m_dirblksize,
1334                                      mp->m_sb.sb_blocksize);
1335         map_info = kmem_zalloc(offsetof(struct xfs_dir2_leaf_map_info, map) +
1336                                 (length * sizeof(struct xfs_bmbt_irec)),
1337                                KM_SLEEP | KM_NOFS);
1338         map_info->map_size = length;
1339
1340         /*
1341          * Inside the loop we keep the main offset value as a byte offset
1342          * in the directory file.
1343          */
1344         curoff = xfs_dir2_dataptr_to_byte(mp, ctx->pos);
1345
1346         /*
1347          * Force this conversion through db so we truncate the offset
1348          * down to get the start of the data block.
1349          */
1350         map_info->map_off = xfs_dir2_db_to_da(mp,
1351                                               xfs_dir2_byte_to_db(mp, curoff));
1352
1353         /*
1354          * Loop over directory entries until we reach the end offset.
1355          * Get more blocks and readahead as necessary.
1356          */
1357         while (curoff < XFS_DIR2_LEAF_OFFSET) {
1358                 /*
1359                  * If we have no buffer, or we're off the end of the
1360                  * current buffer, need to get another one.
1361                  */
1362                 if (!bp || ptr >= (char *)bp->b_addr + mp->m_dirblksize) {
1363
1364                         error = xfs_dir2_leaf_readbuf(dp, bufsize, map_info,
1365                                                       &curoff, &bp);
1366                         if (error || !map_info->map_valid)
1367                                 break;
1368
1369                         /*
1370                          * Having done a read, we need to set a new offset.
1371                          */
1372                         newoff = xfs_dir2_db_off_to_byte(mp, map_info->curdb, 0);
1373                         /*
1374                          * Start of the current block.
1375                          */
1376                         if (curoff < newoff)
1377                                 curoff = newoff;
1378                         /*
1379                          * Make sure we're in the right block.
1380                          */
1381                         else if (curoff > newoff)
1382                                 ASSERT(xfs_dir2_byte_to_db(mp, curoff) ==
1383                                        map_info->curdb);
1384                         hdr = bp->b_addr;
1385                         xfs_dir3_data_check(dp, bp);
1386                         /*
1387                          * Find our position in the block.
1388                          */
1389                         ptr = (char *)xfs_dir3_data_entry_p(hdr);
1390                         byteoff = xfs_dir2_byte_to_off(mp, curoff);
1391                         /*
1392                          * Skip past the header.
1393                          */
1394                         if (byteoff == 0)
1395                                 curoff += xfs_dir3_data_entry_offset(hdr);
1396                         /*
1397                          * Skip past entries until we reach our offset.
1398                          */
1399                         else {
1400                                 while ((char *)ptr - (char *)hdr < byteoff) {
1401                                         dup = (xfs_dir2_data_unused_t *)ptr;
1402
1403                                         if (be16_to_cpu(dup->freetag)
1404                                                   == XFS_DIR2_DATA_FREE_TAG) {
1405
1406                                                 length = be16_to_cpu(dup->length);
1407                                                 ptr += length;
1408                                                 continue;
1409                                         }
1410                                         dep = (xfs_dir2_data_entry_t *)ptr;
1411                                         length =
1412                                            xfs_dir2_data_entsize(dep->namelen);
1413                                         ptr += length;
1414                                 }
1415                                 /*
1416                                  * Now set our real offset.
1417                                  */
1418                                 curoff =
1419                                         xfs_dir2_db_off_to_byte(mp,
1420                                             xfs_dir2_byte_to_db(mp, curoff),
1421                                             (char *)ptr - (char *)hdr);
1422                                 if (ptr >= (char *)hdr + mp->m_dirblksize) {
1423                                         continue;
1424                                 }
1425                         }
1426                 }
1427                 /*
1428                  * We have a pointer to an entry.
1429                  * Is it a live one?
1430                  */
1431                 dup = (xfs_dir2_data_unused_t *)ptr;
1432                 /*
1433                  * No, it's unused, skip over it.
1434                  */
1435                 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
1436                         length = be16_to_cpu(dup->length);
1437                         ptr += length;
1438                         curoff += length;
1439                         continue;
1440                 }
1441
1442                 dep = (xfs_dir2_data_entry_t *)ptr;
1443                 length = xfs_dir2_data_entsize(dep->namelen);
1444
1445                 ctx->pos = xfs_dir2_byte_to_dataptr(mp, curoff) & 0x7fffffff;
1446                 if (!dir_emit(ctx, (char *)dep->name, dep->namelen,
1447                             be64_to_cpu(dep->inumber), DT_UNKNOWN))
1448                         break;
1449
1450                 /*
1451                  * Advance to next entry in the block.
1452                  */
1453                 ptr += length;
1454                 curoff += length;
1455                 /* bufsize may have just been a guess; don't go negative */
1456                 bufsize = bufsize > length ? bufsize - length : 0;
1457         }
1458
1459         /*
1460          * All done.  Set output offset value to current offset.
1461          */
1462         if (curoff > xfs_dir2_dataptr_to_byte(mp, XFS_DIR2_MAX_DATAPTR))
1463                 ctx->pos = XFS_DIR2_MAX_DATAPTR & 0x7fffffff;
1464         else
1465                 ctx->pos = xfs_dir2_byte_to_dataptr(mp, curoff) & 0x7fffffff;
1466         kmem_free(map_info);
1467         if (bp)
1468                 xfs_trans_brelse(NULL, bp);
1469         return error;
1470 }
1471
1472
1473 /*
1474  * Log the bests entries indicated from a leaf1 block.
1475  */
1476 static void
1477 xfs_dir3_leaf_log_bests(
1478         xfs_trans_t             *tp,            /* transaction pointer */
1479         struct xfs_buf          *bp,            /* leaf buffer */
1480         int                     first,          /* first entry to log */
1481         int                     last)           /* last entry to log */
1482 {
1483         __be16                  *firstb;        /* pointer to first entry */
1484         __be16                  *lastb;         /* pointer to last entry */
1485         struct xfs_dir2_leaf    *leaf = bp->b_addr;
1486         xfs_dir2_leaf_tail_t    *ltp;           /* leaf tail structure */
1487
1488         ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) ||
1489                leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAF1_MAGIC));
1490
1491         ltp = xfs_dir2_leaf_tail_p(tp->t_mountp, leaf);
1492         firstb = xfs_dir2_leaf_bests_p(ltp) + first;
1493         lastb = xfs_dir2_leaf_bests_p(ltp) + last;
1494         xfs_trans_log_buf(tp, bp, (uint)((char *)firstb - (char *)leaf),
1495                 (uint)((char *)lastb - (char *)leaf + sizeof(*lastb) - 1));
1496 }
1497
1498 /*
1499  * Log the leaf entries indicated from a leaf1 or leafn block.
1500  */
1501 void
1502 xfs_dir3_leaf_log_ents(
1503         xfs_trans_t             *tp,            /* transaction pointer */
1504         struct xfs_buf          *bp,            /* leaf buffer */
1505         int                     first,          /* first entry to log */
1506         int                     last)           /* last entry to log */
1507 {
1508         xfs_dir2_leaf_entry_t   *firstlep;      /* pointer to first entry */
1509         xfs_dir2_leaf_entry_t   *lastlep;       /* pointer to last entry */
1510         struct xfs_dir2_leaf    *leaf = bp->b_addr;
1511         struct xfs_dir2_leaf_entry *ents;
1512
1513         ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) ||
1514                leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAF1_MAGIC) ||
1515                leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
1516                leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC));
1517
1518         ents = xfs_dir3_leaf_ents_p(leaf);
1519         firstlep = &ents[first];
1520         lastlep = &ents[last];
1521         xfs_trans_log_buf(tp, bp, (uint)((char *)firstlep - (char *)leaf),
1522                 (uint)((char *)lastlep - (char *)leaf + sizeof(*lastlep) - 1));
1523 }
1524
1525 /*
1526  * Log the header of the leaf1 or leafn block.
1527  */
1528 void
1529 xfs_dir3_leaf_log_header(
1530         struct xfs_trans        *tp,
1531         struct xfs_buf          *bp)
1532 {
1533         struct xfs_dir2_leaf    *leaf = bp->b_addr;
1534
1535         ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) ||
1536                leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAF1_MAGIC) ||
1537                leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
1538                leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC));
1539
1540         xfs_trans_log_buf(tp, bp, (uint)((char *)&leaf->hdr - (char *)leaf),
1541                           xfs_dir3_leaf_hdr_size(leaf) - 1);
1542 }
1543
1544 /*
1545  * Log the tail of the leaf1 block.
1546  */
1547 STATIC void
1548 xfs_dir3_leaf_log_tail(
1549         struct xfs_trans        *tp,
1550         struct xfs_buf          *bp)
1551 {
1552         struct xfs_dir2_leaf    *leaf = bp->b_addr;
1553         xfs_dir2_leaf_tail_t    *ltp;           /* leaf tail structure */
1554         struct xfs_mount        *mp = tp->t_mountp;
1555
1556         ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) ||
1557                leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAF1_MAGIC) ||
1558                leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
1559                leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC));
1560
1561         ltp = xfs_dir2_leaf_tail_p(mp, leaf);
1562         xfs_trans_log_buf(tp, bp, (uint)((char *)ltp - (char *)leaf),
1563                 (uint)(mp->m_dirblksize - 1));
1564 }
1565
1566 /*
1567  * Look up the entry referred to by args in the leaf format directory.
1568  * Most of the work is done by the xfs_dir2_leaf_lookup_int routine which
1569  * is also used by the node-format code.
1570  */
1571 int
1572 xfs_dir2_leaf_lookup(
1573         xfs_da_args_t           *args)          /* operation arguments */
1574 {
1575         struct xfs_buf          *dbp;           /* data block buffer */
1576         xfs_dir2_data_entry_t   *dep;           /* data block entry */
1577         xfs_inode_t             *dp;            /* incore directory inode */
1578         int                     error;          /* error return code */
1579         int                     index;          /* found entry index */
1580         struct xfs_buf          *lbp;           /* leaf buffer */
1581         xfs_dir2_leaf_t         *leaf;          /* leaf structure */
1582         xfs_dir2_leaf_entry_t   *lep;           /* leaf entry */
1583         xfs_trans_t             *tp;            /* transaction pointer */
1584         struct xfs_dir2_leaf_entry *ents;
1585
1586         trace_xfs_dir2_leaf_lookup(args);
1587
1588         /*
1589          * Look up name in the leaf block, returning both buffers and index.
1590          */
1591         if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) {
1592                 return error;
1593         }
1594         tp = args->trans;
1595         dp = args->dp;
1596         xfs_dir3_leaf_check(dp->i_mount, lbp);
1597         leaf = lbp->b_addr;
1598         ents = xfs_dir3_leaf_ents_p(leaf);
1599         /*
1600          * Get to the leaf entry and contained data entry address.
1601          */
1602         lep = &ents[index];
1603
1604         /*
1605          * Point to the data entry.
1606          */
1607         dep = (xfs_dir2_data_entry_t *)
1608               ((char *)dbp->b_addr +
1609                xfs_dir2_dataptr_to_off(dp->i_mount, be32_to_cpu(lep->address)));
1610         /*
1611          * Return the found inode number & CI name if appropriate
1612          */
1613         args->inumber = be64_to_cpu(dep->inumber);
1614         error = xfs_dir_cilookup_result(args, dep->name, dep->namelen);
1615         xfs_trans_brelse(tp, dbp);
1616         xfs_trans_brelse(tp, lbp);
1617         return XFS_ERROR(error);
1618 }
1619
1620 /*
1621  * Look up name/hash in the leaf block.
1622  * Fill in indexp with the found index, and dbpp with the data buffer.
1623  * If not found dbpp will be NULL, and ENOENT comes back.
1624  * lbpp will always be filled in with the leaf buffer unless there's an error.
1625  */
1626 static int                                      /* error */
1627 xfs_dir2_leaf_lookup_int(
1628         xfs_da_args_t           *args,          /* operation arguments */
1629         struct xfs_buf          **lbpp,         /* out: leaf buffer */
1630         int                     *indexp,        /* out: index in leaf block */
1631         struct xfs_buf          **dbpp)         /* out: data buffer */
1632 {
1633         xfs_dir2_db_t           curdb = -1;     /* current data block number */
1634         struct xfs_buf          *dbp = NULL;    /* data buffer */
1635         xfs_dir2_data_entry_t   *dep;           /* data entry */
1636         xfs_inode_t             *dp;            /* incore directory inode */
1637         int                     error;          /* error return code */
1638         int                     index;          /* index in leaf block */
1639         struct xfs_buf          *lbp;           /* leaf buffer */
1640         xfs_dir2_leaf_entry_t   *lep;           /* leaf entry */
1641         xfs_dir2_leaf_t         *leaf;          /* leaf structure */
1642         xfs_mount_t             *mp;            /* filesystem mount point */
1643         xfs_dir2_db_t           newdb;          /* new data block number */
1644         xfs_trans_t             *tp;            /* transaction pointer */
1645         xfs_dir2_db_t           cidb = -1;      /* case match data block no. */
1646         enum xfs_dacmp          cmp;            /* name compare result */
1647         struct xfs_dir2_leaf_entry *ents;
1648         struct xfs_dir3_icleaf_hdr leafhdr;
1649
1650         dp = args->dp;
1651         tp = args->trans;
1652         mp = dp->i_mount;
1653
1654         error = xfs_dir3_leaf_read(tp, dp, mp->m_dirleafblk, -1, &lbp);
1655         if (error)
1656                 return error;
1657
1658         *lbpp = lbp;
1659         leaf = lbp->b_addr;
1660         xfs_dir3_leaf_check(mp, lbp);
1661         ents = xfs_dir3_leaf_ents_p(leaf);
1662         xfs_dir3_leaf_hdr_from_disk(&leafhdr, leaf);
1663
1664         /*
1665          * Look for the first leaf entry with our hash value.
1666          */
1667         index = xfs_dir2_leaf_search_hash(args, lbp);
1668         /*
1669          * Loop over all the entries with the right hash value
1670          * looking to match the name.
1671          */
1672         for (lep = &ents[index];
1673              index < leafhdr.count && be32_to_cpu(lep->hashval) == args->hashval;
1674              lep++, index++) {
1675                 /*
1676                  * Skip over stale leaf entries.
1677                  */
1678                 if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR)
1679                         continue;
1680                 /*
1681                  * Get the new data block number.
1682                  */
1683                 newdb = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address));
1684                 /*
1685                  * If it's not the same as the old data block number,
1686                  * need to pitch the old one and read the new one.
1687                  */
1688                 if (newdb != curdb) {
1689                         if (dbp)
1690                                 xfs_trans_brelse(tp, dbp);
1691                         error = xfs_dir3_data_read(tp, dp,
1692                                                    xfs_dir2_db_to_da(mp, newdb),
1693                                                    -1, &dbp);
1694                         if (error) {
1695                                 xfs_trans_brelse(tp, lbp);
1696                                 return error;
1697                         }
1698                         curdb = newdb;
1699                 }
1700                 /*
1701                  * Point to the data entry.
1702                  */
1703                 dep = (xfs_dir2_data_entry_t *)((char *)dbp->b_addr +
1704                         xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address)));
1705                 /*
1706                  * Compare name and if it's an exact match, return the index
1707                  * and buffer. If it's the first case-insensitive match, store
1708                  * the index and buffer and continue looking for an exact match.
1709                  */
1710                 cmp = mp->m_dirnameops->compname(args, dep->name, dep->namelen);
1711                 if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
1712                         args->cmpresult = cmp;
1713                         *indexp = index;
1714                         /* case exact match: return the current buffer. */
1715                         if (cmp == XFS_CMP_EXACT) {
1716                                 *dbpp = dbp;
1717                                 return 0;
1718                         }
1719                         cidb = curdb;
1720                 }
1721         }
1722         ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
1723         /*
1724          * Here, we can only be doing a lookup (not a rename or remove).
1725          * If a case-insensitive match was found earlier, re-read the
1726          * appropriate data block if required and return it.
1727          */
1728         if (args->cmpresult == XFS_CMP_CASE) {
1729                 ASSERT(cidb != -1);
1730                 if (cidb != curdb) {
1731                         xfs_trans_brelse(tp, dbp);
1732                         error = xfs_dir3_data_read(tp, dp,
1733                                                    xfs_dir2_db_to_da(mp, cidb),
1734                                                    -1, &dbp);
1735                         if (error) {
1736                                 xfs_trans_brelse(tp, lbp);
1737                                 return error;
1738                         }
1739                 }
1740                 *dbpp = dbp;
1741                 return 0;
1742         }
1743         /*
1744          * No match found, return ENOENT.
1745          */
1746         ASSERT(cidb == -1);
1747         if (dbp)
1748                 xfs_trans_brelse(tp, dbp);
1749         xfs_trans_brelse(tp, lbp);
1750         return XFS_ERROR(ENOENT);
1751 }
1752
1753 /*
1754  * Remove an entry from a leaf format directory.
1755  */
1756 int                                             /* error */
1757 xfs_dir2_leaf_removename(
1758         xfs_da_args_t           *args)          /* operation arguments */
1759 {
1760         __be16                  *bestsp;        /* leaf block best freespace */
1761         xfs_dir2_data_hdr_t     *hdr;           /* data block header */
1762         xfs_dir2_db_t           db;             /* data block number */
1763         struct xfs_buf          *dbp;           /* data block buffer */
1764         xfs_dir2_data_entry_t   *dep;           /* data entry structure */
1765         xfs_inode_t             *dp;            /* incore directory inode */
1766         int                     error;          /* error return code */
1767         xfs_dir2_db_t           i;              /* temporary data block # */
1768         int                     index;          /* index into leaf entries */
1769         struct xfs_buf          *lbp;           /* leaf buffer */
1770         xfs_dir2_leaf_t         *leaf;          /* leaf structure */
1771         xfs_dir2_leaf_entry_t   *lep;           /* leaf entry */
1772         xfs_dir2_leaf_tail_t    *ltp;           /* leaf tail structure */
1773         xfs_mount_t             *mp;            /* filesystem mount point */
1774         int                     needlog;        /* need to log data header */
1775         int                     needscan;       /* need to rescan data frees */
1776         xfs_dir2_data_off_t     oldbest;        /* old value of best free */
1777         xfs_trans_t             *tp;            /* transaction pointer */
1778         struct xfs_dir2_data_free *bf;          /* bestfree table */
1779         struct xfs_dir2_leaf_entry *ents;
1780         struct xfs_dir3_icleaf_hdr leafhdr;
1781
1782         trace_xfs_dir2_leaf_removename(args);
1783
1784         /*
1785          * Lookup the leaf entry, get the leaf and data blocks read in.
1786          */
1787         if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) {
1788                 return error;
1789         }
1790         dp = args->dp;
1791         tp = args->trans;
1792         mp = dp->i_mount;
1793         leaf = lbp->b_addr;
1794         hdr = dbp->b_addr;
1795         xfs_dir3_data_check(dp, dbp);
1796         bf = xfs_dir3_data_bestfree_p(hdr);
1797         xfs_dir3_leaf_hdr_from_disk(&leafhdr, leaf);
1798         ents = xfs_dir3_leaf_ents_p(leaf);
1799         /*
1800          * Point to the leaf entry, use that to point to the data entry.
1801          */
1802         lep = &ents[index];
1803         db = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address));
1804         dep = (xfs_dir2_data_entry_t *)
1805               ((char *)hdr + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address)));
1806         needscan = needlog = 0;
1807         oldbest = be16_to_cpu(bf[0].length);
1808         ltp = xfs_dir2_leaf_tail_p(mp, leaf);
1809         bestsp = xfs_dir2_leaf_bests_p(ltp);
1810         ASSERT(be16_to_cpu(bestsp[db]) == oldbest);
1811         /*
1812          * Mark the former data entry unused.
1813          */
1814         xfs_dir2_data_make_free(tp, dbp,
1815                 (xfs_dir2_data_aoff_t)((char *)dep - (char *)hdr),
1816                 xfs_dir2_data_entsize(dep->namelen), &needlog, &needscan);
1817         /*
1818          * We just mark the leaf entry stale by putting a null in it.
1819          */
1820         leafhdr.stale++;
1821         xfs_dir3_leaf_hdr_to_disk(leaf, &leafhdr);
1822         xfs_dir3_leaf_log_header(tp, lbp);
1823
1824         lep->address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR);
1825         xfs_dir3_leaf_log_ents(tp, lbp, index, index);
1826
1827         /*
1828          * Scan the freespace in the data block again if necessary,
1829          * log the data block header if necessary.
1830          */
1831         if (needscan)
1832                 xfs_dir2_data_freescan(mp, hdr, &needlog);
1833         if (needlog)
1834                 xfs_dir2_data_log_header(tp, dbp);
1835         /*
1836          * If the longest freespace in the data block has changed,
1837          * put the new value in the bests table and log that.
1838          */
1839         if (be16_to_cpu(bf[0].length) != oldbest) {
1840                 bestsp[db] = bf[0].length;
1841                 xfs_dir3_leaf_log_bests(tp, lbp, db, db);
1842         }
1843         xfs_dir3_data_check(dp, dbp);
1844         /*
1845          * If the data block is now empty then get rid of the data block.
1846          */
1847         if (be16_to_cpu(bf[0].length) ==
1848                         mp->m_dirblksize - xfs_dir3_data_entry_offset(hdr)) {
1849                 ASSERT(db != mp->m_dirdatablk);
1850                 if ((error = xfs_dir2_shrink_inode(args, db, dbp))) {
1851                         /*
1852                          * Nope, can't get rid of it because it caused
1853                          * allocation of a bmap btree block to do so.
1854                          * Just go on, returning success, leaving the
1855                          * empty block in place.
1856                          */
1857                         if (error == ENOSPC && args->total == 0)
1858                                 error = 0;
1859                         xfs_dir3_leaf_check(mp, lbp);
1860                         return error;
1861                 }
1862                 dbp = NULL;
1863                 /*
1864                  * If this is the last data block then compact the
1865                  * bests table by getting rid of entries.
1866                  */
1867                 if (db == be32_to_cpu(ltp->bestcount) - 1) {
1868                         /*
1869                          * Look for the last active entry (i).
1870                          */
1871                         for (i = db - 1; i > 0; i--) {
1872                                 if (bestsp[i] != cpu_to_be16(NULLDATAOFF))
1873                                         break;
1874                         }
1875                         /*
1876                          * Copy the table down so inactive entries at the
1877                          * end are removed.
1878                          */
1879                         memmove(&bestsp[db - i], bestsp,
1880                                 (be32_to_cpu(ltp->bestcount) - (db - i)) * sizeof(*bestsp));
1881                         be32_add_cpu(&ltp->bestcount, -(db - i));
1882                         xfs_dir3_leaf_log_tail(tp, lbp);
1883                         xfs_dir3_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1);
1884                 } else
1885                         bestsp[db] = cpu_to_be16(NULLDATAOFF);
1886         }
1887         /*
1888          * If the data block was not the first one, drop it.
1889          */
1890         else if (db != mp->m_dirdatablk)
1891                 dbp = NULL;
1892
1893         xfs_dir3_leaf_check(mp, lbp);
1894         /*
1895          * See if we can convert to block form.
1896          */
1897         return xfs_dir2_leaf_to_block(args, lbp, dbp);
1898 }
1899
1900 /*
1901  * Replace the inode number in a leaf format directory entry.
1902  */
1903 int                                             /* error */
1904 xfs_dir2_leaf_replace(
1905         xfs_da_args_t           *args)          /* operation arguments */
1906 {
1907         struct xfs_buf          *dbp;           /* data block buffer */
1908         xfs_dir2_data_entry_t   *dep;           /* data block entry */
1909         xfs_inode_t             *dp;            /* incore directory inode */
1910         int                     error;          /* error return code */
1911         int                     index;          /* index of leaf entry */
1912         struct xfs_buf          *lbp;           /* leaf buffer */
1913         xfs_dir2_leaf_t         *leaf;          /* leaf structure */
1914         xfs_dir2_leaf_entry_t   *lep;           /* leaf entry */
1915         xfs_trans_t             *tp;            /* transaction pointer */
1916         struct xfs_dir2_leaf_entry *ents;
1917
1918         trace_xfs_dir2_leaf_replace(args);
1919
1920         /*
1921          * Look up the entry.
1922          */
1923         if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) {
1924                 return error;
1925         }
1926         dp = args->dp;
1927         leaf = lbp->b_addr;
1928         ents = xfs_dir3_leaf_ents_p(leaf);
1929         /*
1930          * Point to the leaf entry, get data address from it.
1931          */
1932         lep = &ents[index];
1933         /*
1934          * Point to the data entry.
1935          */
1936         dep = (xfs_dir2_data_entry_t *)
1937               ((char *)dbp->b_addr +
1938                xfs_dir2_dataptr_to_off(dp->i_mount, be32_to_cpu(lep->address)));
1939         ASSERT(args->inumber != be64_to_cpu(dep->inumber));
1940         /*
1941          * Put the new inode number in, log it.
1942          */
1943         dep->inumber = cpu_to_be64(args->inumber);
1944         tp = args->trans;
1945         xfs_dir2_data_log_entry(tp, dbp, dep);
1946         xfs_dir3_leaf_check(dp->i_mount, lbp);
1947         xfs_trans_brelse(tp, lbp);
1948         return 0;
1949 }
1950
1951 /*
1952  * Return index in the leaf block (lbp) which is either the first
1953  * one with this hash value, or if there are none, the insert point
1954  * for that hash value.
1955  */
1956 int                                             /* index value */
1957 xfs_dir2_leaf_search_hash(
1958         xfs_da_args_t           *args,          /* operation arguments */
1959         struct xfs_buf          *lbp)           /* leaf buffer */
1960 {
1961         xfs_dahash_t            hash=0;         /* hash from this entry */
1962         xfs_dahash_t            hashwant;       /* hash value looking for */
1963         int                     high;           /* high leaf index */
1964         int                     low;            /* low leaf index */
1965         xfs_dir2_leaf_t         *leaf;          /* leaf structure */
1966         xfs_dir2_leaf_entry_t   *lep;           /* leaf entry */
1967         int                     mid=0;          /* current leaf index */
1968         struct xfs_dir2_leaf_entry *ents;
1969         struct xfs_dir3_icleaf_hdr leafhdr;
1970
1971         leaf = lbp->b_addr;
1972         ents = xfs_dir3_leaf_ents_p(leaf);
1973         xfs_dir3_leaf_hdr_from_disk(&leafhdr, leaf);
1974
1975 #ifndef __KERNEL__
1976         if (!leafhdr.count)
1977                 return 0;
1978 #endif
1979         /*
1980          * Note, the table cannot be empty, so we have to go through the loop.
1981          * Binary search the leaf entries looking for our hash value.
1982          */
1983         for (lep = ents, low = 0, high = leafhdr.count - 1,
1984                 hashwant = args->hashval;
1985              low <= high; ) {
1986                 mid = (low + high) >> 1;
1987                 if ((hash = be32_to_cpu(lep[mid].hashval)) == hashwant)
1988                         break;
1989                 if (hash < hashwant)
1990                         low = mid + 1;
1991                 else
1992                         high = mid - 1;
1993         }
1994         /*
1995          * Found one, back up through all the equal hash values.
1996          */
1997         if (hash == hashwant) {
1998                 while (mid > 0 && be32_to_cpu(lep[mid - 1].hashval) == hashwant) {
1999                         mid--;
2000                 }
2001         }
2002         /*
2003          * Need to point to an entry higher than ours.
2004          */
2005         else if (hash < hashwant)
2006                 mid++;
2007         return mid;
2008 }
2009
2010 /*
2011  * Trim off a trailing data block.  We know it's empty since the leaf
2012  * freespace table says so.
2013  */
2014 int                                             /* error */
2015 xfs_dir2_leaf_trim_data(
2016         xfs_da_args_t           *args,          /* operation arguments */
2017         struct xfs_buf          *lbp,           /* leaf buffer */
2018         xfs_dir2_db_t           db)             /* data block number */
2019 {
2020         __be16                  *bestsp;        /* leaf bests table */
2021         struct xfs_buf          *dbp;           /* data block buffer */
2022         xfs_inode_t             *dp;            /* incore directory inode */
2023         int                     error;          /* error return value */
2024         xfs_dir2_leaf_t         *leaf;          /* leaf structure */
2025         xfs_dir2_leaf_tail_t    *ltp;           /* leaf tail structure */
2026         xfs_mount_t             *mp;            /* filesystem mount point */
2027         xfs_trans_t             *tp;            /* transaction pointer */
2028
2029         dp = args->dp;
2030         mp = dp->i_mount;
2031         tp = args->trans;
2032         /*
2033          * Read the offending data block.  We need its buffer.
2034          */
2035         error = xfs_dir3_data_read(tp, dp, xfs_dir2_db_to_da(mp, db), -1, &dbp);
2036         if (error)
2037                 return error;
2038
2039         leaf = lbp->b_addr;
2040         ltp = xfs_dir2_leaf_tail_p(mp, leaf);
2041
2042 #ifdef DEBUG
2043 {
2044         struct xfs_dir2_data_hdr *hdr = dbp->b_addr;
2045         struct xfs_dir2_data_free *bf = xfs_dir3_data_bestfree_p(hdr);
2046
2047         ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
2048                hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC));
2049         ASSERT(be16_to_cpu(bf[0].length) ==
2050                mp->m_dirblksize - xfs_dir3_data_entry_offset(hdr));
2051         ASSERT(db == be32_to_cpu(ltp->bestcount) - 1);
2052 }
2053 #endif
2054
2055         /*
2056          * Get rid of the data block.
2057          */
2058         if ((error = xfs_dir2_shrink_inode(args, db, dbp))) {
2059                 ASSERT(error != ENOSPC);
2060                 xfs_trans_brelse(tp, dbp);
2061                 return error;
2062         }
2063         /*
2064          * Eliminate the last bests entry from the table.
2065          */
2066         bestsp = xfs_dir2_leaf_bests_p(ltp);
2067         be32_add_cpu(&ltp->bestcount, -1);
2068         memmove(&bestsp[1], &bestsp[0], be32_to_cpu(ltp->bestcount) * sizeof(*bestsp));
2069         xfs_dir3_leaf_log_tail(tp, lbp);
2070         xfs_dir3_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1);
2071         return 0;
2072 }
2073
2074 static inline size_t
2075 xfs_dir3_leaf_size(
2076         struct xfs_dir3_icleaf_hdr      *hdr,
2077         int                             counts)
2078 {
2079         int     entries;
2080         int     hdrsize;
2081
2082         entries = hdr->count - hdr->stale;
2083         if (hdr->magic == XFS_DIR2_LEAF1_MAGIC ||
2084             hdr->magic == XFS_DIR2_LEAFN_MAGIC)
2085                 hdrsize = sizeof(struct xfs_dir2_leaf_hdr);
2086         else
2087                 hdrsize = sizeof(struct xfs_dir3_leaf_hdr);
2088
2089         return hdrsize + entries * sizeof(xfs_dir2_leaf_entry_t)
2090                        + counts * sizeof(xfs_dir2_data_off_t)
2091                        + sizeof(xfs_dir2_leaf_tail_t);
2092 }
2093
2094 /*
2095  * Convert node form directory to leaf form directory.
2096  * The root of the node form dir needs to already be a LEAFN block.
2097  * Just return if we can't do anything.
2098  */
2099 int                                             /* error */
2100 xfs_dir2_node_to_leaf(
2101         xfs_da_state_t          *state)         /* directory operation state */
2102 {
2103         xfs_da_args_t           *args;          /* operation arguments */
2104         xfs_inode_t             *dp;            /* incore directory inode */
2105         int                     error;          /* error return code */
2106         struct xfs_buf          *fbp;           /* buffer for freespace block */
2107         xfs_fileoff_t           fo;             /* freespace file offset */
2108         xfs_dir2_free_t         *free;          /* freespace structure */
2109         struct xfs_buf          *lbp;           /* buffer for leaf block */
2110         xfs_dir2_leaf_tail_t    *ltp;           /* tail of leaf structure */
2111         xfs_dir2_leaf_t         *leaf;          /* leaf structure */
2112         xfs_mount_t             *mp;            /* filesystem mount point */
2113         int                     rval;           /* successful free trim? */
2114         xfs_trans_t             *tp;            /* transaction pointer */
2115         struct xfs_dir3_icleaf_hdr leafhdr;
2116         struct xfs_dir3_icfree_hdr freehdr;
2117
2118         /*
2119          * There's more than a leaf level in the btree, so there must
2120          * be multiple leafn blocks.  Give up.
2121          */
2122         if (state->path.active > 1)
2123                 return 0;
2124         args = state->args;
2125
2126         trace_xfs_dir2_node_to_leaf(args);
2127
2128         mp = state->mp;
2129         dp = args->dp;
2130         tp = args->trans;
2131         /*
2132          * Get the last offset in the file.
2133          */
2134         if ((error = xfs_bmap_last_offset(tp, dp, &fo, XFS_DATA_FORK))) {
2135                 return error;
2136         }
2137         fo -= mp->m_dirblkfsbs;
2138         /*
2139          * If there are freespace blocks other than the first one,
2140          * take this opportunity to remove trailing empty freespace blocks
2141          * that may have been left behind during no-space-reservation
2142          * operations.
2143          */
2144         while (fo > mp->m_dirfreeblk) {
2145                 if ((error = xfs_dir2_node_trim_free(args, fo, &rval))) {
2146                         return error;
2147                 }
2148                 if (rval)
2149                         fo -= mp->m_dirblkfsbs;
2150                 else
2151                         return 0;
2152         }
2153         /*
2154          * Now find the block just before the freespace block.
2155          */
2156         if ((error = xfs_bmap_last_before(tp, dp, &fo, XFS_DATA_FORK))) {
2157                 return error;
2158         }
2159         /*
2160          * If it's not the single leaf block, give up.
2161          */
2162         if (XFS_FSB_TO_B(mp, fo) > XFS_DIR2_LEAF_OFFSET + mp->m_dirblksize)
2163                 return 0;
2164         lbp = state->path.blk[0].bp;
2165         leaf = lbp->b_addr;
2166         xfs_dir3_leaf_hdr_from_disk(&leafhdr, leaf);
2167
2168         ASSERT(leafhdr.magic == XFS_DIR2_LEAFN_MAGIC ||
2169                leafhdr.magic == XFS_DIR3_LEAFN_MAGIC);
2170
2171         /*
2172          * Read the freespace block.
2173          */
2174         error = xfs_dir2_free_read(tp, dp,  mp->m_dirfreeblk, &fbp);
2175         if (error)
2176                 return error;
2177         free = fbp->b_addr;
2178         xfs_dir3_free_hdr_from_disk(&freehdr, free);
2179
2180         ASSERT(!freehdr.firstdb);
2181
2182         /*
2183          * Now see if the leafn and free data will fit in a leaf1.
2184          * If not, release the buffer and give up.
2185          */
2186         if (xfs_dir3_leaf_size(&leafhdr, freehdr.nvalid) > mp->m_dirblksize) {
2187                 xfs_trans_brelse(tp, fbp);
2188                 return 0;
2189         }
2190
2191         /*
2192          * If the leaf has any stale entries in it, compress them out.
2193          */
2194         if (leafhdr.stale)
2195                 xfs_dir3_leaf_compact(args, &leafhdr, lbp);
2196
2197         lbp->b_ops = &xfs_dir3_leaf1_buf_ops;
2198         xfs_trans_buf_set_type(tp, lbp, XFS_BLFT_DIR_LEAF1_BUF);
2199         leafhdr.magic = (leafhdr.magic == XFS_DIR2_LEAFN_MAGIC)
2200                                         ? XFS_DIR2_LEAF1_MAGIC
2201                                         : XFS_DIR3_LEAF1_MAGIC;
2202
2203         /*
2204          * Set up the leaf tail from the freespace block.
2205          */
2206         ltp = xfs_dir2_leaf_tail_p(mp, leaf);
2207         ltp->bestcount = cpu_to_be32(freehdr.nvalid);
2208
2209         /*
2210          * Set up the leaf bests table.
2211          */
2212         memcpy(xfs_dir2_leaf_bests_p(ltp), xfs_dir3_free_bests_p(mp, free),
2213                 freehdr.nvalid * sizeof(xfs_dir2_data_off_t));
2214
2215         xfs_dir3_leaf_hdr_to_disk(leaf, &leafhdr);
2216         xfs_dir3_leaf_log_header(tp, lbp);
2217         xfs_dir3_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1);
2218         xfs_dir3_leaf_log_tail(tp, lbp);
2219         xfs_dir3_leaf_check(mp, lbp);
2220
2221         /*
2222          * Get rid of the freespace block.
2223          */
2224         error = xfs_dir2_shrink_inode(args, XFS_DIR2_FREE_FIRSTDB(mp), fbp);
2225         if (error) {
2226                 /*
2227                  * This can't fail here because it can only happen when
2228                  * punching out the middle of an extent, and this is an
2229                  * isolated block.
2230                  */
2231                 ASSERT(error != ENOSPC);
2232                 return error;
2233         }
2234         fbp = NULL;
2235         /*
2236          * Now see if we can convert the single-leaf directory
2237          * down to a block form directory.
2238          * This routine always kills the dabuf for the leaf, so
2239          * eliminate it from the path.
2240          */
2241         error = xfs_dir2_leaf_to_block(args, lbp, NULL);
2242         state->path.blk[0].bp = NULL;
2243         return error;
2244 }