fs/xfs/libxfs/xfs_bmap.c

   1 /*
   2  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_shared.h"
  21 #include "xfs_format.h"
  22 #include "xfs_log_format.h"
  23 #include "xfs_trans_resv.h"
  24 #include "xfs_bit.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_mount.h"
  27 #include "xfs_defer.h"
  28 #include "xfs_da_format.h"
  29 #include "xfs_da_btree.h"
  30 #include "xfs_dir2.h"
  31 #include "xfs_inode.h"
  32 #include "xfs_btree.h"
  33 #include "xfs_trans.h"
  34 #include "xfs_inode_item.h"
  35 #include "xfs_extfree_item.h"
  36 #include "xfs_alloc.h"
  37 #include "xfs_bmap.h"
  38 #include "xfs_bmap_util.h"
  39 #include "xfs_bmap_btree.h"
  40 #include "xfs_rtalloc.h"
  41 #include "xfs_error.h"
  42 #include "xfs_quota.h"
  43 #include "xfs_trans_space.h"
  44 #include "xfs_buf_item.h"
  45 #include "xfs_trace.h"
  46 #include "xfs_symlink.h"
  47 #include "xfs_attr_leaf.h"
  48 #include "xfs_filestream.h"
  49 #include "xfs_rmap.h"
  50 #include "xfs_ag_resv.h"
  51 #include "xfs_refcount.h"
  52 #include "xfs_rmap_btree.h"
  53 #include "xfs_icache.h"
  54
  55
  56 kmem_zone_t             *xfs_bmap_free_item_zone;
  57
  58 /*
  59  * Miscellaneous helper functions
  60  */
  61
  62 /*
  63  * Compute and fill in the value of the maximum depth of a bmap btree
  64  * in this filesystem.  Done once, during mount.
  65  */
  66 void
  67 xfs_bmap_compute_maxlevels(
  68         xfs_mount_t     *mp,            /* file system mount structure */
  69         int             whichfork)      /* data or attr fork */
  70 {
  71         int             level;          /* btree level */
  72         uint            maxblocks;      /* max blocks at this level */
  73         uint            maxleafents;    /* max leaf entries possible */
  74         int             maxrootrecs;    /* max records in root block */
  75         int             minleafrecs;    /* min records in leaf block */
  76         int             minnoderecs;    /* min records in node block */
  77         int             sz;             /* root block size */
  78
  79         /*
  80          * The maximum number of extents in a file, hence the maximum
  81          * number of leaf entries, is controlled by the type of di_nextents
  82          * (a signed 32-bit number, xfs_extnum_t), or by di_anextents
  83          * (a signed 16-bit number, xfs_aextnum_t).
  84          *
  85          * Note that we can no longer assume that if we are in ATTR1 that
  86          * the fork offset of all the inodes will be
  87          * (xfs_default_attroffset(ip) >> 3) because we could have mounted
  88          * with ATTR2 and then mounted back with ATTR1, keeping the
  89          * di_forkoff's fixed but probably at various positions. Therefore,
  90          * for both ATTR1 and ATTR2 we have to assume the worst case scenario
  91          * of a minimum size available.
  92          */
  93         if (whichfork == XFS_DATA_FORK) {
  94                 maxleafents = MAXEXTNUM;
  95                 sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
  96         } else {
  97                 maxleafents = MAXAEXTNUM;
  98                 sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
  99         }
 100         maxrootrecs = xfs_bmdr_maxrecs(sz, 0);
 101         minleafrecs = mp->m_bmap_dmnr[0];
 102         minnoderecs = mp->m_bmap_dmnr[1];
 103         maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
 104         for (level = 1; maxblocks > 1; level++) {
 105                 if (maxblocks <= maxrootrecs)
 106                         maxblocks = 1;
 107                 else
 108                         maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
 109         }
 110         mp->m_bm_maxlevels[whichfork] = level;
 111 }
 112
 113 STATIC int                              /* error */
 114 xfs_bmbt_lookup_eq(
 115         struct xfs_btree_cur    *cur,
 116         xfs_fileoff_t           off,
 117         xfs_fsblock_t           bno,
 118         xfs_filblks_t           len,
 119         int                     *stat)  /* success/failure */
 120 {
 121         cur->bc_rec.b.br_startoff = off;
 122         cur->bc_rec.b.br_startblock = bno;
 123         cur->bc_rec.b.br_blockcount = len;
 124         return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
 125 }
 126
 127 STATIC int                              /* error */
 128 xfs_bmbt_lookup_ge(
 129         struct xfs_btree_cur    *cur,
 130         xfs_fileoff_t           off,
 131         xfs_fsblock_t           bno,
 132         xfs_filblks_t           len,
 133         int                     *stat)  /* success/failure */
 134 {
 135         cur->bc_rec.b.br_startoff = off;
 136         cur->bc_rec.b.br_startblock = bno;
 137         cur->bc_rec.b.br_blockcount = len;
 138         return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
 139 }
 140
 141 /*
 142  * Check if the inode needs to be converted to btree format.
 143  */
 144 static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork)
 145 {
 146         return whichfork != XFS_COW_FORK &&
 147                 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
 148                 XFS_IFORK_NEXTENTS(ip, whichfork) >
 149                         XFS_IFORK_MAXEXT(ip, whichfork);
 150 }
 151
 152 /*
 153  * Check if the inode should be converted to extent format.
 154  */
 155 static inline bool xfs_bmap_wants_extents(struct xfs_inode *ip, int whichfork)
 156 {
 157         return whichfork != XFS_COW_FORK &&
 158                 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
 159                 XFS_IFORK_NEXTENTS(ip, whichfork) <=
 160                         XFS_IFORK_MAXEXT(ip, whichfork);
 161 }
 162
 163 /*
 164  * Update the record referred to by cur to the value given
 165  * by [off, bno, len, state].
 166  * This either works (return 0) or gets an EFSCORRUPTED error.
 167  */
 168 STATIC int
 169 xfs_bmbt_update(
 170         struct xfs_btree_cur    *cur,
 171         xfs_fileoff_t           off,
 172         xfs_fsblock_t           bno,
 173         xfs_filblks_t           len,
 174         xfs_exntst_t            state)
 175 {
 176         union xfs_btree_rec     rec;
 177
 178         xfs_bmbt_disk_set_allf(&rec.bmbt, off, bno, len, state);
 179         return xfs_btree_update(cur, &rec);
 180 }
 181
 182 /*
 183  * Compute the worst-case number of indirect blocks that will be used
 184  * for ip's delayed extent of length "len".
 185  */
 186 STATIC xfs_filblks_t
 187 xfs_bmap_worst_indlen(
 188         xfs_inode_t     *ip,            /* incore inode pointer */
 189         xfs_filblks_t   len)            /* delayed extent length */
 190 {
 191         int             level;          /* btree level number */
 192         int             maxrecs;        /* maximum record count at this level */
 193         xfs_mount_t     *mp;            /* mount structure */
 194         xfs_filblks_t   rval;           /* return value */
 195         xfs_filblks_t   orig_len;
 196
 197         mp = ip->i_mount;
 198
 199         /* Calculate the worst-case size of the bmbt. */
 200         orig_len = len;
 201         maxrecs = mp->m_bmap_dmxr[0];
 202         for (level = 0, rval = 0;
 203              level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
 204              level++) {
 205                 len += maxrecs - 1;
 206                 do_div(len, maxrecs);
 207                 rval += len;
 208                 if (len == 1) {
 209                         rval += XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
 210                                 level - 1;
 211                         break;
 212                 }
 213                 if (level == 0)
 214                         maxrecs = mp->m_bmap_dmxr[1];
 215         }
 216
 217         /* Calculate the worst-case size of the rmapbt. */
 218         if (xfs_sb_version_hasrmapbt(&mp->m_sb))
 219                 rval += 1 + xfs_rmapbt_calc_size(mp, orig_len) +
 220                                 mp->m_rmap_maxlevels;
 221
 222         return rval;
 223 }
 224
 225 /*
 226  * Calculate the default attribute fork offset for newly created inodes.
 227  */
 228 uint
 229 xfs_default_attroffset(
 230         struct xfs_inode        *ip)
 231 {
 232         struct xfs_mount        *mp = ip->i_mount;
 233         uint                    offset;
 234
 235         if (mp->m_sb.sb_inodesize == 256) {
 236                 offset = XFS_LITINO(mp, ip->i_d.di_version) -
 237                                 XFS_BMDR_SPACE_CALC(MINABTPTRS);
 238         } else {
 239                 offset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
 240         }
 241
 242         ASSERT(offset < XFS_LITINO(mp, ip->i_d.di_version));
 243         return offset;
 244 }
 245
 246 /*
 247  * Helper routine to reset inode di_forkoff field when switching
 248  * attribute fork from local to extent format - we reset it where
 249  * possible to make space available for inline data fork extents.
 250  */
 251 STATIC void
 252 xfs_bmap_forkoff_reset(
 253         xfs_inode_t     *ip,
 254         int             whichfork)
 255 {
 256         if (whichfork == XFS_ATTR_FORK &&
 257             ip->i_d.di_format != XFS_DINODE_FMT_DEV &&
 258             ip->i_d.di_format != XFS_DINODE_FMT_UUID &&
 259             ip->i_d.di_format != XFS_DINODE_FMT_BTREE) {
 260                 uint    dfl_forkoff = xfs_default_attroffset(ip) >> 3;
 261
 262                 if (dfl_forkoff > ip->i_d.di_forkoff)
 263                         ip->i_d.di_forkoff = dfl_forkoff;
 264         }
 265 }
 266
 267 #ifdef DEBUG
 268 STATIC struct xfs_buf *
 269 xfs_bmap_get_bp(
 270         struct xfs_btree_cur    *cur,
 271         xfs_fsblock_t           bno)
 272 {
 273         struct xfs_log_item_desc *lidp;
 274         int                     i;
 275
 276         if (!cur)
 277                 return NULL;
 278
 279         for (i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
 280                 if (!cur->bc_bufs[i])
 281                         break;
 282                 if (XFS_BUF_ADDR(cur->bc_bufs[i]) == bno)
 283                         return cur->bc_bufs[i];
 284         }
 285
 286         /* Chase down all the log items to see if the bp is there */
 287         list_for_each_entry(lidp, &cur->bc_tp->t_items, lid_trans) {
 288                 struct xfs_buf_log_item *bip;
 289                 bip = (struct xfs_buf_log_item *)lidp->lid_item;
 290                 if (bip->bli_item.li_type == XFS_LI_BUF &&
 291                     XFS_BUF_ADDR(bip->bli_buf) == bno)
 292                         return bip->bli_buf;
 293         }
 294
 295         return NULL;
 296 }
 297
 298 STATIC void
 299 xfs_check_block(
 300         struct xfs_btree_block  *block,
 301         xfs_mount_t             *mp,
 302         int                     root,
 303         short                   sz)
 304 {
 305         int                     i, j, dmxr;
 306         __be64                  *pp, *thispa;   /* pointer to block address */
 307         xfs_bmbt_key_t          *prevp, *keyp;
 308
 309         ASSERT(be16_to_cpu(block->bb_level) > 0);
 310
 311         prevp = NULL;
 312         for( i = 1; i <= xfs_btree_get_numrecs(block); i++) {
 313                 dmxr = mp->m_bmap_dmxr[0];
 314                 keyp = XFS_BMBT_KEY_ADDR(mp, block, i);
 315
 316                 if (prevp) {
 317                         ASSERT(be64_to_cpu(prevp->br_startoff) <
 318                                be64_to_cpu(keyp->br_startoff));
 319                 }
 320                 prevp = keyp;
 321
 322                 /*
 323                  * Compare the block numbers to see if there are dups.
 324                  */
 325                 if (root)
 326                         pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz);
 327                 else
 328                         pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr);
 329
 330                 for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
 331                         if (root)
 332                                 thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz);
 333                         else
 334                                 thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr);
 335                         if (*thispa == *pp) {
 336                                 xfs_warn(mp, "%s: thispa(%d) == pp(%d) %Ld",
 337                                         __func__, j, i,
 338                                         (unsigned long long)be64_to_cpu(*thispa));
 339                                 panic("%s: ptrs are equal in node\n",
 340                                         __func__);
 341                         }
 342                 }
 343         }
 344 }
 345
 346 /*
 347  * Check that the extents for the inode ip are in the right order in all
 348  * btree leaves. THis becomes prohibitively expensive for large extent count
 349  * files, so don't bother with inodes that have more than 10,000 extents in
 350  * them. The btree record ordering checks will still be done, so for such large
 351  * bmapbt constructs that is going to catch most corruptions.
 352  */
 353 STATIC void
 354 xfs_bmap_check_leaf_extents(
 355         xfs_btree_cur_t         *cur,   /* btree cursor or null */
 356         xfs_inode_t             *ip,            /* incore inode pointer */
 357         int                     whichfork)      /* data or attr fork */
 358 {
 359         struct xfs_btree_block  *block; /* current btree block */
 360         xfs_fsblock_t           bno;    /* block # of "block" */
 361         xfs_buf_t               *bp;    /* buffer for "block" */
 362         int                     error;  /* error return value */
 363         xfs_extnum_t            i=0, j; /* index into the extents list */
 364         xfs_ifork_t             *ifp;   /* fork structure */
 365         int                     level;  /* btree level, for checking */
 366         xfs_mount_t             *mp;    /* file system mount structure */
 367         __be64                  *pp;    /* pointer to block address */
 368         xfs_bmbt_rec_t          *ep;    /* pointer to current extent */
 369         xfs_bmbt_rec_t          last = {0, 0}; /* last extent in prev block */
 370         xfs_bmbt_rec_t          *nextp; /* pointer to next extent */
 371         int                     bp_release = 0;
 372
 373         if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
 374                 return;
 375         }
 376
 377         /* skip large extent count inodes */
 378         if (ip->i_d.di_nextents > 10000)
 379                 return;
 380
 381         bno = NULLFSBLOCK;
 382         mp = ip->i_mount;
 383         ifp = XFS_IFORK_PTR(ip, whichfork);
 384         block = ifp->if_broot;
 385         /*
 386          * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
 387          */
 388         level = be16_to_cpu(block->bb_level);
 389         ASSERT(level > 0);
 390         xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
 391         pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
 392         bno = be64_to_cpu(*pp);
 393
 394         ASSERT(bno != NULLFSBLOCK);
 395         ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
 396         ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
 397
 398         /*
 399          * Go down the tree until leaf level is reached, following the first
 400          * pointer (leftmost) at each level.
 401          */
 402         while (level-- > 0) {
 403                 /* See if buf is in cur first */
 404                 bp_release = 0;
 405                 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
 406                 if (!bp) {
 407                         bp_release = 1;
 408                         error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
 409                                                 XFS_BMAP_BTREE_REF,
 410                                                 &xfs_bmbt_buf_ops);
 411                         if (error)
 412                                 goto error_norelse;
 413                 }
 414                 block = XFS_BUF_TO_BLOCK(bp);
 415                 if (level == 0)
 416                         break;
 417
 418                 /*
 419                  * Check this block for basic sanity (increasing keys and
 420                  * no duplicate blocks).
 421                  */
 422
 423                 xfs_check_block(block, mp, 0, 0);
 424                 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
 425                 bno = be64_to_cpu(*pp);
 426                 XFS_WANT_CORRUPTED_GOTO(mp,
 427                                         XFS_FSB_SANITY_CHECK(mp, bno), error0);
 428                 if (bp_release) {
 429                         bp_release = 0;
 430                         xfs_trans_brelse(NULL, bp);
 431                 }
 432         }
 433
 434         /*
 435          * Here with bp and block set to the leftmost leaf node in the tree.
 436          */
 437         i = 0;
 438
 439         /*
 440          * Loop over all leaf nodes checking that all extents are in the right order.
 441          */
 442         for (;;) {
 443                 xfs_fsblock_t   nextbno;
 444                 xfs_extnum_t    num_recs;
 445
 446
 447                 num_recs = xfs_btree_get_numrecs(block);
 448
 449                 /*
 450                  * Read-ahead the next leaf block, if any.
 451                  */
 452
 453                 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
 454
 455                 /*
 456                  * Check all the extents to make sure they are OK.
 457                  * If we had a previous block, the last entry should
 458                  * conform with the first entry in this one.
 459                  */
 460
 461                 ep = XFS_BMBT_REC_ADDR(mp, block, 1);
 462                 if (i) {
 463                         ASSERT(xfs_bmbt_disk_get_startoff(&last) +
 464                                xfs_bmbt_disk_get_blockcount(&last) <=
 465                                xfs_bmbt_disk_get_startoff(ep));
 466                 }
 467                 for (j = 1; j < num_recs; j++) {
 468                         nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1);
 469                         ASSERT(xfs_bmbt_disk_get_startoff(ep) +
 470                                xfs_bmbt_disk_get_blockcount(ep) <=
 471                                xfs_bmbt_disk_get_startoff(nextp));
 472                         ep = nextp;
 473                 }
 474
 475                 last = *ep;
 476                 i += num_recs;
 477                 if (bp_release) {
 478                         bp_release = 0;
 479                         xfs_trans_brelse(NULL, bp);
 480                 }
 481                 bno = nextbno;
 482                 /*
 483                  * If we've reached the end, stop.
 484                  */
 485                 if (bno == NULLFSBLOCK)
 486                         break;
 487
 488                 bp_release = 0;
 489                 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
 490                 if (!bp) {
 491                         bp_release = 1;
 492                         error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
 493                                                 XFS_BMAP_BTREE_REF,
 494                                                 &xfs_bmbt_buf_ops);
 495                         if (error)
 496                                 goto error_norelse;
 497                 }
 498                 block = XFS_BUF_TO_BLOCK(bp);
 499         }
 500
 501         return;
 502
 503 error0:
 504         xfs_warn(mp, "%s: at error0", __func__);
 505         if (bp_release)
 506                 xfs_trans_brelse(NULL, bp);
 507 error_norelse:
 508         xfs_warn(mp, "%s: BAD after btree leaves for %d extents",
 509                 __func__, i);
 510         panic("%s: CORRUPTED BTREE OR SOMETHING", __func__);
 511         return;
 512 }
 513
 514 /*
 515  * Add bmap trace insert entries for all the contents of the extent records.
 516  */
 517 void
 518 xfs_bmap_trace_exlist(
 519         xfs_inode_t     *ip,            /* incore inode pointer */
 520         xfs_extnum_t    cnt,            /* count of entries in the list */
 521         int             whichfork,      /* data or attr or cow fork */
 522         unsigned long   caller_ip)
 523 {
 524         xfs_extnum_t    idx;            /* extent record index */
 525         xfs_ifork_t     *ifp;           /* inode fork pointer */
 526         int             state = 0;
 527
 528         if (whichfork == XFS_ATTR_FORK)
 529                 state |= BMAP_ATTRFORK;
 530         else if (whichfork == XFS_COW_FORK)
 531                 state |= BMAP_COWFORK;
 532
 533         ifp = XFS_IFORK_PTR(ip, whichfork);
 534         ASSERT(cnt == xfs_iext_count(ifp));
 535         for (idx = 0; idx < cnt; idx++)
 536                 trace_xfs_extlist(ip, idx, state, caller_ip);
 537 }
 538
 539 /*
 540  * Validate that the bmbt_irecs being returned from bmapi are valid
 541  * given the caller's original parameters.  Specifically check the
 542  * ranges of the returned irecs to ensure that they only extend beyond
 543  * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
 544  */
 545 STATIC void
 546 xfs_bmap_validate_ret(
 547         xfs_fileoff_t           bno,
 548         xfs_filblks_t           len,
 549         int                     flags,
 550         xfs_bmbt_irec_t         *mval,
 551         int                     nmap,
 552         int                     ret_nmap)
 553 {
 554         int                     i;              /* index to map values */
 555
 556         ASSERT(ret_nmap <= nmap);
 557
 558         for (i = 0; i < ret_nmap; i++) {
 559                 ASSERT(mval[i].br_blockcount > 0);
 560                 if (!(flags & XFS_BMAPI_ENTIRE)) {
 561                         ASSERT(mval[i].br_startoff >= bno);
 562                         ASSERT(mval[i].br_blockcount <= len);
 563                         ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
 564                                bno + len);
 565                 } else {
 566                         ASSERT(mval[i].br_startoff < bno + len);
 567                         ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
 568                                bno);
 569                 }
 570                 ASSERT(i == 0 ||
 571                        mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
 572                        mval[i].br_startoff);
 573                 ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
 574                        mval[i].br_startblock != HOLESTARTBLOCK);
 575                 ASSERT(mval[i].br_state == XFS_EXT_NORM ||
 576                        mval[i].br_state == XFS_EXT_UNWRITTEN);
 577         }
 578 }
 579
 580 #else
 581 #define xfs_bmap_check_leaf_extents(cur, ip, whichfork)         do { } while (0)
 582 #define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
 583 #endif /* DEBUG */
 584
 585 /*
 586  * bmap free list manipulation functions
 587  */
 588
 589 /*
 590  * Add the extent to the list of extents to be free at transaction end.
 591  * The list is maintained sorted (by block number).
 592  */
 593 void
 594 xfs_bmap_add_free(
 595         struct xfs_mount                *mp,
 596         struct xfs_defer_ops            *dfops,
 597         xfs_fsblock_t                   bno,
 598         xfs_filblks_t                   len,
 599         struct xfs_owner_info           *oinfo)
 600 {
 601         struct xfs_extent_free_item     *new;           /* new element */
 602 #ifdef DEBUG
 603         xfs_agnumber_t          agno;
 604         xfs_agblock_t           agbno;
 605
 606         ASSERT(bno != NULLFSBLOCK);
 607         ASSERT(len > 0);
 608         ASSERT(len <= MAXEXTLEN);
 609         ASSERT(!isnullstartblock(bno));
 610         agno = XFS_FSB_TO_AGNO(mp, bno);
 611         agbno = XFS_FSB_TO_AGBNO(mp, bno);
 612         ASSERT(agno < mp->m_sb.sb_agcount);
 613         ASSERT(agbno < mp->m_sb.sb_agblocks);
 614         ASSERT(len < mp->m_sb.sb_agblocks);
 615         ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
 616 #endif
 617         ASSERT(xfs_bmap_free_item_zone != NULL);
 618
 619         new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
 620         new->xefi_startblock = bno;
 621         new->xefi_blockcount = (xfs_extlen_t)len;
 622         if (oinfo)
 623                 new->xefi_oinfo = *oinfo;
 624         else
 625                 xfs_rmap_skip_owner_update(&new->xefi_oinfo);
 626         trace_xfs_bmap_free_defer(mp, XFS_FSB_TO_AGNO(mp, bno), 0,
 627                         XFS_FSB_TO_AGBNO(mp, bno), len);
 628         xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_FREE, &new->xefi_list);
 629 }
 630
 631 /*
 632  * Inode fork format manipulation functions
 633  */
 634
 635 /*
 636  * Transform a btree format file with only one leaf node, where the
 637  * extents list will fit in the inode, into an extents format file.
 638  * Since the file extents are already in-core, all we have to do is
 639  * give up the space for the btree root and pitch the leaf block.
 640  */
 641 STATIC int                              /* error */
 642 xfs_bmap_btree_to_extents(
 643         xfs_trans_t             *tp,    /* transaction pointer */
 644         xfs_inode_t             *ip,    /* incore inode pointer */
 645         xfs_btree_cur_t         *cur,   /* btree cursor */
 646         int                     *logflagsp, /* inode logging flags */
 647         int                     whichfork)  /* data or attr fork */
 648 {
 649         /* REFERENCED */
 650         struct xfs_btree_block  *cblock;/* child btree block */
 651         xfs_fsblock_t           cbno;   /* child block number */
 652         xfs_buf_t               *cbp;   /* child block's buffer */
 653         int                     error;  /* error return value */
 654         xfs_ifork_t             *ifp;   /* inode fork data */
 655         xfs_mount_t             *mp;    /* mount point structure */
 656         __be64                  *pp;    /* ptr to block address */
 657         struct xfs_btree_block  *rblock;/* root btree block */
 658         struct xfs_owner_info   oinfo;
 659
 660         mp = ip->i_mount;
 661         ifp = XFS_IFORK_PTR(ip, whichfork);
 662         ASSERT(whichfork != XFS_COW_FORK);
 663         ASSERT(ifp->if_flags & XFS_IFEXTENTS);
 664         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
 665         rblock = ifp->if_broot;
 666         ASSERT(be16_to_cpu(rblock->bb_level) == 1);
 667         ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
 668         ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
 669         pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
 670         cbno = be64_to_cpu(*pp);
 671         *logflagsp = 0;
 672 #ifdef DEBUG
 673         if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
 674                 return error;
 675 #endif
 676         error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp, XFS_BMAP_BTREE_REF,
 677                                 &xfs_bmbt_buf_ops);
 678         if (error)
 679                 return error;
 680         cblock = XFS_BUF_TO_BLOCK(cbp);
 681         if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
 682                 return error;
 683         xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, whichfork);
 684         xfs_bmap_add_free(mp, cur->bc_private.b.dfops, cbno, 1, &oinfo);
 685         ip->i_d.di_nblocks--;
 686         xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
 687         xfs_trans_binval(tp, cbp);
 688         if (cur->bc_bufs[0] == cbp)
 689                 cur->bc_bufs[0] = NULL;
 690         xfs_iroot_realloc(ip, -1, whichfork);
 691         ASSERT(ifp->if_broot == NULL);
 692         ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
 693         XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
 694         *logflagsp = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
 695         return 0;
 696 }
 697
 698 /*
 699  * Convert an extents-format file into a btree-format file.
 700  * The new file will have a root block (in the inode) and a single child block.
 701  */
 702 STATIC int                                      /* error */
 703 xfs_bmap_extents_to_btree(
 704         xfs_trans_t             *tp,            /* transaction pointer */
 705         xfs_inode_t             *ip,            /* incore inode pointer */
 706         xfs_fsblock_t           *firstblock,    /* first-block-allocated */
 707         struct xfs_defer_ops    *dfops,         /* blocks freed in xaction */
 708         xfs_btree_cur_t         **curp,         /* cursor returned to caller */
 709         int                     wasdel,         /* converting a delayed alloc */
 710         int                     *logflagsp,     /* inode logging flags */
 711         int                     whichfork)      /* data or attr fork */
 712 {
 713         struct xfs_btree_block  *ablock;        /* allocated (child) bt block */
 714         xfs_buf_t               *abp;           /* buffer for ablock */
 715         xfs_alloc_arg_t         args;           /* allocation arguments */
 716         xfs_bmbt_rec_t          *arp;           /* child record pointer */
 717         struct xfs_btree_block  *block;         /* btree root block */
 718         xfs_btree_cur_t         *cur;           /* bmap btree cursor */
 719         xfs_bmbt_rec_host_t     *ep;            /* extent record pointer */
 720         int                     error;          /* error return value */
 721         xfs_extnum_t            i, cnt;         /* extent record index */
 722         xfs_ifork_t             *ifp;           /* inode fork pointer */
 723         xfs_bmbt_key_t          *kp;            /* root block key pointer */
 724         xfs_mount_t             *mp;            /* mount structure */
 725         xfs_extnum_t            nextents;       /* number of file extents */
 726         xfs_bmbt_ptr_t          *pp;            /* root block address pointer */
 727
 728         mp = ip->i_mount;
 729         ASSERT(whichfork != XFS_COW_FORK);
 730         ifp = XFS_IFORK_PTR(ip, whichfork);
 731         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
 732
 733         /*
 734          * Make space in the inode incore.
 735          */
 736         xfs_iroot_realloc(ip, 1, whichfork);
 737         ifp->if_flags |= XFS_IFBROOT;
 738
 739         /*
 740          * Fill in the root.
 741          */
 742         block = ifp->if_broot;
 743         xfs_btree_init_block_int(mp, block, XFS_BUF_DADDR_NULL,
 744                                  XFS_BTNUM_BMAP, 1, 1, ip->i_ino,
 745                                  XFS_BTREE_LONG_PTRS);
 746         /*
 747          * Need a cursor.  Can't allocate until bb_level is filled in.
 748          */
 749         cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
 750         cur->bc_private.b.firstblock = *firstblock;
 751         cur->bc_private.b.dfops = dfops;
 752         cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
 753         /*
 754          * Convert to a btree with two levels, one record in root.
 755          */
 756         XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
 757         memset(&args, 0, sizeof(args));
 758         args.tp = tp;
 759         args.mp = mp;
 760         xfs_rmap_ino_bmbt_owner(&args.oinfo, ip->i_ino, whichfork);
 761         args.firstblock = *firstblock;
 762         if (*firstblock == NULLFSBLOCK) {
 763                 args.type = XFS_ALLOCTYPE_START_BNO;
 764                 args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
 765         } else if (dfops->dop_low) {
 766                 args.type = XFS_ALLOCTYPE_START_BNO;
 767 try_another_ag:
 768                 args.fsbno = *firstblock;
 769         } else {
 770                 args.type = XFS_ALLOCTYPE_NEAR_BNO;
 771                 args.fsbno = *firstblock;
 772         }
 773         args.minlen = args.maxlen = args.prod = 1;
 774         args.wasdel = wasdel;
 775         *logflagsp = 0;
 776         if ((error = xfs_alloc_vextent(&args))) {
 777                 xfs_iroot_realloc(ip, -1, whichfork);
 778                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 779                 return error;
 780         }
 781
 782         /*
 783          * During a CoW operation, the allocation and bmbt updates occur in
 784          * different transactions.  The mapping code tries to put new bmbt
 785          * blocks near extents being mapped, but the only way to guarantee this
 786          * is if the alloc and the mapping happen in a single transaction that
 787          * has a block reservation.  That isn't the case here, so if we run out
 788          * of space we'll try again with another AG.
 789          */
 790         if (xfs_sb_version_hasreflink(&cur->bc_mp->m_sb) &&
 791             args.fsbno == NULLFSBLOCK &&
 792             args.type == XFS_ALLOCTYPE_NEAR_BNO) {
 793                 args.type = XFS_ALLOCTYPE_FIRST_AG;
 794                 goto try_another_ag;
 795         }
 796         if (WARN_ON_ONCE(args.fsbno == NULLFSBLOCK)) {
 797                 xfs_iroot_realloc(ip, -1, whichfork);
 798                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 799                 return -ENOSPC;
 800         }
 801         /*
 802          * Allocation can't fail, the space was reserved.
 803          */
 804         ASSERT(*firstblock == NULLFSBLOCK ||
 805                args.agno >= XFS_FSB_TO_AGNO(mp, *firstblock));
 806         *firstblock = cur->bc_private.b.firstblock = args.fsbno;
 807         cur->bc_private.b.allocated++;
 808         ip->i_d.di_nblocks++;
 809         xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
 810         abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
 811         /*
 812          * Fill in the child block.
 813          */
 814         abp->b_ops = &xfs_bmbt_buf_ops;
 815         ablock = XFS_BUF_TO_BLOCK(abp);
 816         xfs_btree_init_block_int(mp, ablock, abp->b_bn,
 817                                 XFS_BTNUM_BMAP, 0, 0, ip->i_ino,
 818                                 XFS_BTREE_LONG_PTRS);
 819
 820         arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
 821         nextents =  xfs_iext_count(ifp);
 822         for (cnt = i = 0; i < nextents; i++) {
 823                 ep = xfs_iext_get_ext(ifp, i);
 824                 if (!isnullstartblock(xfs_bmbt_get_startblock(ep))) {
 825                         arp->l0 = cpu_to_be64(ep->l0);
 826                         arp->l1 = cpu_to_be64(ep->l1);
 827                         arp++; cnt++;
 828                 }
 829         }
 830         ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
 831         xfs_btree_set_numrecs(ablock, cnt);
 832
 833         /*
 834          * Fill in the root key and pointer.
 835          */
 836         kp = XFS_BMBT_KEY_ADDR(mp, block, 1);
 837         arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
 838         kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
 839         pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur,
 840                                                 be16_to_cpu(block->bb_level)));
 841         *pp = cpu_to_be64(args.fsbno);
 842
 843         /*
 844          * Do all this logging at the end so that
 845          * the root is at the right level.
 846          */
 847         xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS);
 848         xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
 849         ASSERT(*curp == NULL);
 850         *curp = cur;
 851         *logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork);
 852         return 0;
 853 }
 854
 855 /*
 856  * Convert a local file to an extents file.
 857  * This code is out of bounds for data forks of regular files,
 858  * since the file data needs to get logged so things will stay consistent.
 859  * (The bmap-level manipulations are ok, though).
 860  */
 861 void
 862 xfs_bmap_local_to_extents_empty(
 863         struct xfs_inode        *ip,
 864         int                     whichfork)
 865 {
 866         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
 867
 868         ASSERT(whichfork != XFS_COW_FORK);
 869         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
 870         ASSERT(ifp->if_bytes == 0);
 871         ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
 872
 873         xfs_bmap_forkoff_reset(ip, whichfork);
 874         ifp->if_flags &= ~XFS_IFINLINE;
 875         ifp->if_flags |= XFS_IFEXTENTS;
 876         XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
 877 }
 878
 879
 880 STATIC int                              /* error */
 881 xfs_bmap_local_to_extents(
 882         xfs_trans_t     *tp,            /* transaction pointer */
 883         xfs_inode_t     *ip,            /* incore inode pointer */
 884         xfs_fsblock_t   *firstblock,    /* first block allocated in xaction */
 885         xfs_extlen_t    total,          /* total blocks needed by transaction */
 886         int             *logflagsp,     /* inode logging flags */
 887         int             whichfork,
 888         void            (*init_fn)(struct xfs_trans *tp,
 889                                    struct xfs_buf *bp,
 890                                    struct xfs_inode *ip,
 891                                    struct xfs_ifork *ifp))
 892 {
 893         int             error = 0;
 894         int             flags;          /* logging flags returned */
 895         xfs_ifork_t     *ifp;           /* inode fork pointer */
 896         xfs_alloc_arg_t args;           /* allocation arguments */
 897         xfs_buf_t       *bp;            /* buffer for extent block */
 898         xfs_bmbt_rec_host_t *ep;        /* extent record pointer */
 899
 900         /*
 901          * We don't want to deal with the case of keeping inode data inline yet.
 902          * So sending the data fork of a regular inode is invalid.
 903          */
 904         ASSERT(!(S_ISREG(VFS_I(ip)->i_mode) && whichfork == XFS_DATA_FORK));
 905         ifp = XFS_IFORK_PTR(ip, whichfork);
 906         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
 907
 908         if (!ifp->if_bytes) {
 909                 xfs_bmap_local_to_extents_empty(ip, whichfork);
 910                 flags = XFS_ILOG_CORE;
 911                 goto done;
 912         }
 913
 914         flags = 0;
 915         error = 0;
 916         ASSERT((ifp->if_flags & (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) ==
 917                                                                 XFS_IFINLINE);
 918         memset(&args, 0, sizeof(args));
 919         args.tp = tp;
 920         args.mp = ip->i_mount;
 921         xfs_rmap_ino_owner(&args.oinfo, ip->i_ino, whichfork, 0);
 922         args.firstblock = *firstblock;
 923         /*
 924          * Allocate a block.  We know we need only one, since the
 925          * file currently fits in an inode.
 926          */
 927         if (*firstblock == NULLFSBLOCK) {
 928 try_another_ag:
 929                 args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
 930                 args.type = XFS_ALLOCTYPE_START_BNO;
 931         } else {
 932                 args.fsbno = *firstblock;
 933                 args.type = XFS_ALLOCTYPE_NEAR_BNO;
 934         }
 935         args.total = total;
 936         args.minlen = args.maxlen = args.prod = 1;
 937         error = xfs_alloc_vextent(&args);
 938         if (error)
 939                 goto done;
 940
 941         /*
 942          * During a CoW operation, the allocation and bmbt updates occur in
 943          * different transactions.  The mapping code tries to put new bmbt
 944          * blocks near extents being mapped, but the only way to guarantee this
 945          * is if the alloc and the mapping happen in a single transaction that
 946          * has a block reservation.  That isn't the case here, so if we run out
 947          * of space we'll try again with another AG.
 948          */
 949         if (xfs_sb_version_hasreflink(&ip->i_mount->m_sb) &&
 950             args.fsbno == NULLFSBLOCK &&
 951             args.type == XFS_ALLOCTYPE_NEAR_BNO) {
 952                 goto try_another_ag;
 953         }
 954         /* Can't fail, the space was reserved. */
 955         ASSERT(args.fsbno != NULLFSBLOCK);
 956         ASSERT(args.len == 1);
 957         *firstblock = args.fsbno;
 958         bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
 959
 960         /*
 961          * Initialize the block, copy the data and log the remote buffer.
 962          *
 963          * The callout is responsible for logging because the remote format
 964          * might differ from the local format and thus we don't know how much to
 965          * log here. Note that init_fn must also set the buffer log item type
 966          * correctly.
 967          */
 968         init_fn(tp, bp, ip, ifp);
 969
 970         /* account for the change in fork size */
 971         xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
 972         xfs_bmap_local_to_extents_empty(ip, whichfork);
 973         flags |= XFS_ILOG_CORE;
 974
 975         xfs_iext_add(ifp, 0, 1);
 976         ep = xfs_iext_get_ext(ifp, 0);
 977         xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
 978         trace_xfs_bmap_post_update(ip, 0,
 979                         whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0,
 980                         _THIS_IP_);
 981         XFS_IFORK_NEXT_SET(ip, whichfork, 1);
 982         ip->i_d.di_nblocks = 1;
 983         xfs_trans_mod_dquot_byino(tp, ip,
 984                 XFS_TRANS_DQ_BCOUNT, 1L);
 985         flags |= xfs_ilog_fext(whichfork);
 986
 987 done:
 988         *logflagsp = flags;
 989         return error;
 990 }
 991
 992 /*
 993  * Called from xfs_bmap_add_attrfork to handle btree format files.
 994  */
 995 STATIC int                                      /* error */
 996 xfs_bmap_add_attrfork_btree(
 997         xfs_trans_t             *tp,            /* transaction pointer */
 998         xfs_inode_t             *ip,            /* incore inode pointer */
 999         xfs_fsblock_t           *firstblock,    /* first block allocated */
1000         struct xfs_defer_ops    *dfops,         /* blocks to free at commit */
1001         int                     *flags)         /* inode logging flags */
1002 {
1003         xfs_btree_cur_t         *cur;           /* btree cursor */
1004         int                     error;          /* error return value */
1005         xfs_mount_t             *mp;            /* file system mount struct */
1006         int                     stat;           /* newroot status */
1007
1008         mp = ip->i_mount;
1009         if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
1010                 *flags |= XFS_ILOG_DBROOT;
1011         else {
1012                 cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
1013                 cur->bc_private.b.dfops = dfops;
1014                 cur->bc_private.b.firstblock = *firstblock;
1015                 if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
1016                         goto error0;
1017                 /* must be at least one entry */
1018                 XFS_WANT_CORRUPTED_GOTO(mp, stat == 1, error0);
1019                 if ((error = xfs_btree_new_iroot(cur, flags, &stat)))
1020                         goto error0;
1021                 if (stat == 0) {
1022                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
1023                         return -ENOSPC;
1024                 }
1025                 *firstblock = cur->bc_private.b.firstblock;
1026                 cur->bc_private.b.allocated = 0;
1027                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
1028         }
1029         return 0;
1030 error0:
1031         xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
1032         return error;
1033 }
1034
1035 /*
1036  * Called from xfs_bmap_add_attrfork to handle extents format files.
1037  */
1038 STATIC int                                      /* error */
1039 xfs_bmap_add_attrfork_extents(
1040         xfs_trans_t             *tp,            /* transaction pointer */
1041         xfs_inode_t             *ip,            /* incore inode pointer */
1042         xfs_fsblock_t           *firstblock,    /* first block allocated */
1043         struct xfs_defer_ops    *dfops,         /* blocks to free at commit */
1044         int                     *flags)         /* inode logging flags */
1045 {
1046         xfs_btree_cur_t         *cur;           /* bmap btree cursor */
1047         int                     error;          /* error return value */
1048
1049         if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
1050                 return 0;
1051         cur = NULL;
1052         error = xfs_bmap_extents_to_btree(tp, ip, firstblock, dfops, &cur, 0,
1053                 flags, XFS_DATA_FORK);
1054         if (cur) {
1055                 cur->bc_private.b.allocated = 0;
1056                 xfs_btree_del_cursor(cur,
1057                         error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
1058         }
1059         return error;
1060 }
1061
1062 /*
1063  * Called from xfs_bmap_add_attrfork to handle local format files. Each
1064  * different data fork content type needs a different callout to do the
1065  * conversion. Some are basic and only require special block initialisation
1066  * callouts for the data formating, others (directories) are so specialised they
1067  * handle everything themselves.
1068  *
1069  * XXX (dgc): investigate whether directory conversion can use the generic
1070  * formatting callout. It should be possible - it's just a very complex
1071  * formatter.
1072  */
1073 STATIC int                                      /* error */
1074 xfs_bmap_add_attrfork_local(
1075         xfs_trans_t             *tp,            /* transaction pointer */
1076         xfs_inode_t             *ip,            /* incore inode pointer */
1077         xfs_fsblock_t           *firstblock,    /* first block allocated */
1078         struct xfs_defer_ops    *dfops,         /* blocks to free at commit */
1079         int                     *flags)         /* inode logging flags */
1080 {
1081         xfs_da_args_t           dargs;          /* args for dir/attr code */
1082
1083         if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
1084                 return 0;
1085
1086         if (S_ISDIR(VFS_I(ip)->i_mode)) {
1087                 memset(&dargs, 0, sizeof(dargs));
1088                 dargs.geo = ip->i_mount->m_dir_geo;
1089                 dargs.dp = ip;
1090                 dargs.firstblock = firstblock;
1091                 dargs.dfops = dfops;
1092                 dargs.total = dargs.geo->fsbcount;
1093                 dargs.whichfork = XFS_DATA_FORK;
1094                 dargs.trans = tp;
1095                 return xfs_dir2_sf_to_block(&dargs);
1096         }
1097
1098         if (S_ISLNK(VFS_I(ip)->i_mode))
1099                 return xfs_bmap_local_to_extents(tp, ip, firstblock, 1,
1100                                                  flags, XFS_DATA_FORK,
1101                                                  xfs_symlink_local_to_remote);
1102
1103         /* should only be called for types that support local format data */
1104         ASSERT(0);
1105         return -EFSCORRUPTED;
1106 }
1107
1108 /*
1109  * Convert inode from non-attributed to attributed.
1110  * Must not be in a transaction, ip must not be locked.
1111  */
1112 int                                             /* error code */
1113 xfs_bmap_add_attrfork(
1114         xfs_inode_t             *ip,            /* incore inode pointer */
1115         int                     size,           /* space new attribute needs */
1116         int                     rsvd)           /* xact may use reserved blks */
1117 {
1118         xfs_fsblock_t           firstblock;     /* 1st block/ag allocated */
1119         struct xfs_defer_ops    dfops;          /* freed extent records */
1120         xfs_mount_t             *mp;            /* mount structure */
1121         xfs_trans_t             *tp;            /* transaction pointer */
1122         int                     blks;           /* space reservation */
1123         int                     version = 1;    /* superblock attr version */
1124         int                     logflags;       /* logging flags */
1125         int                     error;          /* error return value */
1126
1127         ASSERT(XFS_IFORK_Q(ip) == 0);
1128
1129         mp = ip->i_mount;
1130         ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
1131
1132         blks = XFS_ADDAFORK_SPACE_RES(mp);
1133
1134         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_addafork, blks, 0,
1135                         rsvd ? XFS_TRANS_RESERVE : 0, &tp);
1136         if (error)
1137                 return error;
1138
1139         xfs_ilock(ip, XFS_ILOCK_EXCL);
1140         error = xfs_trans_reserve_quota_nblks(tp, ip, blks, 0, rsvd ?
1141                         XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
1142                         XFS_QMOPT_RES_REGBLKS);
1143         if (error)
1144                 goto trans_cancel;
1145         if (XFS_IFORK_Q(ip))
1146                 goto trans_cancel;
1147         if (ip->i_d.di_anextents != 0) {
1148                 error = -EFSCORRUPTED;
1149                 goto trans_cancel;
1150         }
1151         if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
1152                 /*
1153                  * For inodes coming from pre-6.2 filesystems.
1154                  */
1155                 ASSERT(ip->i_d.di_aformat == 0);
1156                 ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
1157         }
1158
1159         xfs_trans_ijoin(tp, ip, 0);
1160         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1161
1162         switch (ip->i_d.di_format) {
1163         case XFS_DINODE_FMT_DEV:
1164                 ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
1165                 break;
1166         case XFS_DINODE_FMT_UUID:
1167                 ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
1168                 break;
1169         case XFS_DINODE_FMT_LOCAL:
1170         case XFS_DINODE_FMT_EXTENTS:
1171         case XFS_DINODE_FMT_BTREE:
1172                 ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
1173                 if (!ip->i_d.di_forkoff)
1174                         ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3;
1175                 else if (mp->m_flags & XFS_MOUNT_ATTR2)
1176                         version = 2;
1177                 break;
1178         default:
1179                 ASSERT(0);
1180                 error = -EINVAL;
1181                 goto trans_cancel;
1182         }
1183
1184         ASSERT(ip->i_afp == NULL);
1185         ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
1186         ip->i_afp->if_flags = XFS_IFEXTENTS;
1187         logflags = 0;
1188         xfs_defer_init(&dfops, &firstblock);
1189         switch (ip->i_d.di_format) {
1190         case XFS_DINODE_FMT_LOCAL:
1191                 error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &dfops,
1192                         &logflags);
1193                 break;
1194         case XFS_DINODE_FMT_EXTENTS:
1195                 error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
1196                         &dfops, &logflags);
1197                 break;
1198         case XFS_DINODE_FMT_BTREE:
1199                 error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &dfops,
1200                         &logflags);
1201                 break;
1202         default:
1203                 error = 0;
1204                 break;
1205         }
1206         if (logflags)
1207                 xfs_trans_log_inode(tp, ip, logflags);
1208         if (error)
1209                 goto bmap_cancel;
1210         if (!xfs_sb_version_hasattr(&mp->m_sb) ||
1211            (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2)) {
1212                 bool log_sb = false;
1213
1214                 spin_lock(&mp->m_sb_lock);
1215                 if (!xfs_sb_version_hasattr(&mp->m_sb)) {
1216                         xfs_sb_version_addattr(&mp->m_sb);
1217                         log_sb = true;
1218                 }
1219                 if (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2) {
1220                         xfs_sb_version_addattr2(&mp->m_sb);
1221                         log_sb = true;
1222                 }
1223                 spin_unlock(&mp->m_sb_lock);
1224                 if (log_sb)
1225                         xfs_log_sb(tp);
1226         }
1227
1228         error = xfs_defer_finish(&tp, &dfops, NULL);
1229         if (error)
1230                 goto bmap_cancel;
1231         error = xfs_trans_commit(tp);
1232         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1233         return error;
1234
1235 bmap_cancel:
1236         xfs_defer_cancel(&dfops);
1237 trans_cancel:
1238         xfs_trans_cancel(tp);
1239         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1240         return error;
1241 }
1242
1243 /*
1244  * Internal and external extent tree search functions.
1245  */
1246
1247 /*
1248  * Read in the extents to if_extents.
1249  * All inode fields are set up by caller, we just traverse the btree
1250  * and copy the records in. If the file system cannot contain unwritten
1251  * extents, the records are checked for no "state" flags.
1252  */
1253 int                                     /* error */
1254 xfs_bmap_read_extents(
1255         xfs_trans_t             *tp,    /* transaction pointer */
1256         xfs_inode_t             *ip,    /* incore inode */
1257         int                     whichfork) /* data or attr fork */
1258 {
1259         struct xfs_btree_block  *block; /* current btree block */
1260         xfs_fsblock_t           bno;    /* block # of "block" */
1261         xfs_buf_t               *bp;    /* buffer for "block" */
1262         int                     error;  /* error return value */
1263         xfs_exntfmt_t           exntf;  /* XFS_EXTFMT_NOSTATE, if checking */
1264         xfs_extnum_t            i, j;   /* index into the extents list */
1265         xfs_ifork_t             *ifp;   /* fork structure */
1266         int                     level;  /* btree level, for checking */
1267         xfs_mount_t             *mp;    /* file system mount structure */
1268         __be64                  *pp;    /* pointer to block address */
1269         /* REFERENCED */
1270         xfs_extnum_t            room;   /* number of entries there's room for */
1271
1272         mp = ip->i_mount;
1273         ifp = XFS_IFORK_PTR(ip, whichfork);
1274         exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
1275                                         XFS_EXTFMT_INODE(ip);
1276         block = ifp->if_broot;
1277         /*
1278          * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
1279          */
1280         level = be16_to_cpu(block->bb_level);
1281         ASSERT(level > 0);
1282         pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
1283         bno = be64_to_cpu(*pp);
1284
1285         /*
1286          * Go down the tree until leaf level is reached, following the first
1287          * pointer (leftmost) at each level.
1288          */
1289         while (level-- > 0) {
1290                 error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
1291                                 XFS_BMAP_BTREE_REF, &xfs_bmbt_buf_ops);
1292                 if (error)
1293                         return error;
1294                 block = XFS_BUF_TO_BLOCK(bp);
1295                 if (level == 0)
1296                         break;
1297                 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
1298                 bno = be64_to_cpu(*pp);
1299                 XFS_WANT_CORRUPTED_GOTO(mp,
1300                         XFS_FSB_SANITY_CHECK(mp, bno), error0);
1301                 xfs_trans_brelse(tp, bp);
1302         }
1303         /*
1304          * Here with bp and block set to the leftmost leaf node in the tree.
1305          */
1306         room = xfs_iext_count(ifp);
1307         i = 0;
1308         /*
1309          * Loop over all leaf nodes.  Copy information to the extent records.
1310          */
1311         for (;;) {
1312                 xfs_bmbt_rec_t  *frp;
1313                 xfs_fsblock_t   nextbno;
1314                 xfs_extnum_t    num_recs;
1315                 xfs_extnum_t    start;
1316
1317                 num_recs = xfs_btree_get_numrecs(block);
1318                 if (unlikely(i + num_recs > room)) {
1319                         ASSERT(i + num_recs <= room);
1320                         xfs_warn(ip->i_mount,
1321                                 "corrupt dinode %Lu, (btree extents).",
1322                                 (unsigned long long) ip->i_ino);
1323                         XFS_CORRUPTION_ERROR("xfs_bmap_read_extents(1)",
1324                                 XFS_ERRLEVEL_LOW, ip->i_mount, block);
1325                         goto error0;
1326                 }
1327                 /*
1328                  * Read-ahead the next leaf block, if any.
1329                  */
1330                 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
1331                 if (nextbno != NULLFSBLOCK)
1332                         xfs_btree_reada_bufl(mp, nextbno, 1,
1333                                              &xfs_bmbt_buf_ops);
1334                 /*
1335                  * Copy records into the extent records.
1336                  */
1337                 frp = XFS_BMBT_REC_ADDR(mp, block, 1);
1338                 start = i;
1339                 for (j = 0; j < num_recs; j++, i++, frp++) {
1340                         xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i);
1341                         trp->l0 = be64_to_cpu(frp->l0);
1342                         trp->l1 = be64_to_cpu(frp->l1);
1343                 }
1344                 if (exntf == XFS_EXTFMT_NOSTATE) {
1345                         /*
1346                          * Check all attribute bmap btree records and
1347                          * any "older" data bmap btree records for a
1348                          * set bit in the "extent flag" position.
1349                          */
1350                         if (unlikely(xfs_check_nostate_extents(ifp,
1351                                         start, num_recs))) {
1352                                 XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
1353                                                  XFS_ERRLEVEL_LOW,
1354                                                  ip->i_mount);
1355                                 goto error0;
1356                         }
1357                 }
1358                 xfs_trans_brelse(tp, bp);
1359                 bno = nextbno;
1360                 /*
1361                  * If we've reached the end, stop.
1362                  */
1363                 if (bno == NULLFSBLOCK)
1364                         break;
1365                 error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
1366                                 XFS_BMAP_BTREE_REF, &xfs_bmbt_buf_ops);
1367                 if (error)
1368                         return error;
1369                 block = XFS_BUF_TO_BLOCK(bp);
1370         }
1371         if (i != XFS_IFORK_NEXTENTS(ip, whichfork))
1372                 return -EFSCORRUPTED;
1373         ASSERT(i == xfs_iext_count(ifp));
1374         XFS_BMAP_TRACE_EXLIST(ip, i, whichfork);
1375         return 0;
1376 error0:
1377         xfs_trans_brelse(tp, bp);
1378         return -EFSCORRUPTED;
1379 }
1380
1381 /*
1382  * Returns the file-relative block number of the first unused block(s)
1383  * in the file with at least "len" logically contiguous blocks free.
1384  * This is the lowest-address hole if the file has holes, else the first block
1385  * past the end of file.
1386  * Return 0 if the file is currently local (in-inode).
1387  */
1388 int                                             /* error */
1389 xfs_bmap_first_unused(
1390         xfs_trans_t     *tp,                    /* transaction pointer */
1391         xfs_inode_t     *ip,                    /* incore inode */
1392         xfs_extlen_t    len,                    /* size of hole to find */
1393         xfs_fileoff_t   *first_unused,          /* unused block */
1394         int             whichfork)              /* data or attr fork */
1395 {
1396         int             error;                  /* error return value */
1397         int             idx;                    /* extent record index */
1398         xfs_ifork_t     *ifp;                   /* inode fork pointer */
1399         xfs_fileoff_t   lastaddr;               /* last block number seen */
1400         xfs_fileoff_t   lowest;                 /* lowest useful block */
1401         xfs_fileoff_t   max;                    /* starting useful block */
1402         xfs_fileoff_t   off;                    /* offset for this block */
1403         xfs_extnum_t    nextents;               /* number of extent entries */
1404
1405         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
1406                XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
1407                XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
1408         if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
1409                 *first_unused = 0;
1410                 return 0;
1411         }
1412         ifp = XFS_IFORK_PTR(ip, whichfork);
1413         if (!(ifp->if_flags & XFS_IFEXTENTS) &&
1414             (error = xfs_iread_extents(tp, ip, whichfork)))
1415                 return error;
1416         lowest = *first_unused;
1417         nextents = xfs_iext_count(ifp);
1418         for (idx = 0, lastaddr = 0, max = lowest; idx < nextents; idx++) {
1419                 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
1420                 off = xfs_bmbt_get_startoff(ep);
1421                 /*
1422                  * See if the hole before this extent will work.
1423                  */
1424                 if (off >= lowest + len && off - max >= len) {
1425                         *first_unused = max;
1426                         return 0;
1427                 }
1428                 lastaddr = off + xfs_bmbt_get_blockcount(ep);
1429                 max = XFS_FILEOFF_MAX(lastaddr, lowest);
1430         }
1431         *first_unused = max;
1432         return 0;
1433 }
1434
1435 /*
1436  * Returns the file-relative block number of the last block - 1 before
1437  * last_block (input value) in the file.
1438  * This is not based on i_size, it is based on the extent records.
1439  * Returns 0 for local files, as they do not have extent records.
1440  */
1441 int                                             /* error */
1442 xfs_bmap_last_before(
1443         struct xfs_trans        *tp,            /* transaction pointer */
1444         struct xfs_inode        *ip,            /* incore inode */
1445         xfs_fileoff_t           *last_block,    /* last block */
1446         int                     whichfork)      /* data or attr fork */
1447 {
1448         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
1449         struct xfs_bmbt_irec    got;
1450         xfs_extnum_t            idx;
1451         int                     error;
1452
1453         switch (XFS_IFORK_FORMAT(ip, whichfork)) {
1454         case XFS_DINODE_FMT_LOCAL:
1455                 *last_block = 0;
1456                 return 0;
1457         case XFS_DINODE_FMT_BTREE:
1458         case XFS_DINODE_FMT_EXTENTS:
1459                 break;
1460         default:
1461                 return -EIO;
1462         }
1463
1464         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1465                 error = xfs_iread_extents(tp, ip, whichfork);
1466                 if (error)
1467                         return error;
1468         }
1469
1470         if (xfs_iext_lookup_extent(ip, ifp, *last_block - 1, &idx, &got)) {
1471                 if (got.br_startoff <= *last_block - 1)
1472                         return 0;
1473         }
1474
1475         if (xfs_iext_get_extent(ifp, idx - 1, &got)) {
1476                 *last_block = got.br_startoff + got.br_blockcount;
1477                 return 0;
1478         }
1479
1480         *last_block = 0;
1481         return 0;
1482 }
1483
1484 int
1485 xfs_bmap_last_extent(
1486         struct xfs_trans        *tp,
1487         struct xfs_inode        *ip,
1488         int                     whichfork,
1489         struct xfs_bmbt_irec    *rec,
1490         int                     *is_empty)
1491 {
1492         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
1493         int                     error;
1494         int                     nextents;
1495
1496         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1497                 error = xfs_iread_extents(tp, ip, whichfork);
1498                 if (error)
1499                         return error;
1500         }
1501
1502         nextents = xfs_iext_count(ifp);
1503         if (nextents == 0) {
1504                 *is_empty = 1;
1505                 return 0;
1506         }
1507
1508         xfs_bmbt_get_all(xfs_iext_get_ext(ifp, nextents - 1), rec);
1509         *is_empty = 0;
1510         return 0;
1511 }
1512
1513 /*
1514  * Check the last inode extent to determine whether this allocation will result
1515  * in blocks being allocated at the end of the file. When we allocate new data
1516  * blocks at the end of the file which do not start at the previous data block,
1517  * we will try to align the new blocks at stripe unit boundaries.
1518  *
1519  * Returns 1 in bma->aeof if the file (fork) is empty as any new write will be
1520  * at, or past the EOF.
1521  */
1522 STATIC int
1523 xfs_bmap_isaeof(
1524         struct xfs_bmalloca     *bma,
1525         int                     whichfork)
1526 {
1527         struct xfs_bmbt_irec    rec;
1528         int                     is_empty;
1529         int                     error;
1530
1531         bma->aeof = 0;
1532         error = xfs_bmap_last_extent(NULL, bma->ip, whichfork, &rec,
1533                                      &is_empty);
1534         if (error)
1535                 return error;
1536
1537         if (is_empty) {
1538                 bma->aeof = 1;
1539                 return 0;
1540         }
1541
1542         /*
1543          * Check if we are allocation or past the last extent, or at least into
1544          * the last delayed allocated extent.
1545          */
1546         bma->aeof = bma->offset >= rec.br_startoff + rec.br_blockcount ||
1547                 (bma->offset >= rec.br_startoff &&
1548                  isnullstartblock(rec.br_startblock));
1549         return 0;
1550 }
1551
1552 /*
1553  * Returns the file-relative block number of the first block past eof in
1554  * the file.  This is not based on i_size, it is based on the extent records.
1555  * Returns 0 for local files, as they do not have extent records.
1556  */
1557 int
1558 xfs_bmap_last_offset(
1559         struct xfs_inode        *ip,
1560         xfs_fileoff_t           *last_block,
1561         int                     whichfork)
1562 {
1563         struct xfs_bmbt_irec    rec;
1564         int                     is_empty;
1565         int                     error;
1566
1567         *last_block = 0;
1568
1569         if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL)
1570                 return 0;
1571
1572         if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
1573             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
1574                return -EIO;
1575
1576         error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, &is_empty);
1577         if (error || is_empty)
1578                 return error;
1579
1580         *last_block = rec.br_startoff + rec.br_blockcount;
1581         return 0;
1582 }
1583
1584 /*
1585  * Returns whether the selected fork of the inode has exactly one
1586  * block or not.  For the data fork we check this matches di_size,
1587  * implying the file's range is 0..bsize-1.
1588  */
1589 int                                     /* 1=>1 block, 0=>otherwise */
1590 xfs_bmap_one_block(
1591         xfs_inode_t     *ip,            /* incore inode */
1592         int             whichfork)      /* data or attr fork */
1593 {
1594         xfs_bmbt_rec_host_t *ep;        /* ptr to fork's extent */
1595         xfs_ifork_t     *ifp;           /* inode fork pointer */
1596         int             rval;           /* return value */
1597         xfs_bmbt_irec_t s;              /* internal version of extent */
1598
1599 #ifndef DEBUG
1600         if (whichfork == XFS_DATA_FORK)
1601                 return XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize;
1602 #endif  /* !DEBUG */
1603         if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
1604                 return 0;
1605         if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
1606                 return 0;
1607         ifp = XFS_IFORK_PTR(ip, whichfork);
1608         ASSERT(ifp->if_flags & XFS_IFEXTENTS);
1609         ep = xfs_iext_get_ext(ifp, 0);
1610         xfs_bmbt_get_all(ep, &s);
1611         rval = s.br_startoff == 0 && s.br_blockcount == 1;
1612         if (rval && whichfork == XFS_DATA_FORK)
1613                 ASSERT(XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize);
1614         return rval;
1615 }
1616
1617 /*
1618  * Extent tree manipulation functions used during allocation.
1619  */
1620
1621 /*
1622  * Convert a delayed allocation to a real allocation.
1623  */
1624 STATIC int                              /* error */
1625 xfs_bmap_add_extent_delay_real(
1626         struct xfs_bmalloca     *bma,
1627         int                     whichfork)
1628 {
1629         struct xfs_bmbt_irec    *new = &bma->got;
1630         int                     diff;   /* temp value */
1631         xfs_bmbt_rec_host_t     *ep;    /* extent entry for idx */
1632         int                     error;  /* error return value */
1633         int                     i;      /* temp state */
1634         xfs_ifork_t             *ifp;   /* inode fork pointer */
1635         xfs_fileoff_t           new_endoff;     /* end offset of new entry */
1636         xfs_bmbt_irec_t         r[3];   /* neighbor extent entries */
1637                                         /* left is 0, right is 1, prev is 2 */
1638         int                     rval=0; /* return value (logging flags) */
1639         int                     state = 0;/* state bits, accessed thru macros */
1640         xfs_filblks_t           da_new; /* new count del alloc blocks used */
1641         xfs_filblks_t           da_old; /* old count del alloc blocks used */
1642         xfs_filblks_t           temp=0; /* value for da_new calculations */
1643         xfs_filblks_t           temp2=0;/* value for da_new calculations */
1644         int                     tmp_rval;       /* partial logging flags */
1645         struct xfs_mount        *mp;
1646         xfs_extnum_t            *nextents;
1647
1648         mp = bma->ip->i_mount;
1649         ifp = XFS_IFORK_PTR(bma->ip, whichfork);
1650         ASSERT(whichfork != XFS_ATTR_FORK);
1651         nextents = (whichfork == XFS_COW_FORK ? &bma->ip->i_cnextents :
1652                                                 &bma->ip->i_d.di_nextents);
1653
1654         ASSERT(bma->idx >= 0);
1655         ASSERT(bma->idx <= xfs_iext_count(ifp));
1656         ASSERT(!isnullstartblock(new->br_startblock));
1657         ASSERT(!bma->cur ||
1658                (bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
1659
1660         XFS_STATS_INC(mp, xs_add_exlist);
1661
1662 #define LEFT            r[0]
1663 #define RIGHT           r[1]
1664 #define PREV            r[2]
1665
1666         if (whichfork == XFS_COW_FORK)
1667                 state |= BMAP_COWFORK;
1668
1669         /*
1670          * Set up a bunch of variables to make the tests simpler.
1671          */
1672         ep = xfs_iext_get_ext(ifp, bma->idx);
1673         xfs_bmbt_get_all(ep, &PREV);
1674         new_endoff = new->br_startoff + new->br_blockcount;
1675         ASSERT(PREV.br_startoff <= new->br_startoff);
1676         ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
1677
1678         da_old = startblockval(PREV.br_startblock);
1679         da_new = 0;
1680
1681         /*
1682          * Set flags determining what part of the previous delayed allocation
1683          * extent is being replaced by a real allocation.
1684          */
1685         if (PREV.br_startoff == new->br_startoff)
1686                 state |= BMAP_LEFT_FILLING;
1687         if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
1688                 state |= BMAP_RIGHT_FILLING;
1689
1690         /*
1691          * Check and set flags if this segment has a left neighbor.
1692          * Don't set contiguous if the combined extent would be too large.
1693          */
1694         if (bma->idx > 0) {
1695                 state |= BMAP_LEFT_VALID;
1696                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &LEFT);
1697
1698                 if (isnullstartblock(LEFT.br_startblock))
1699                         state |= BMAP_LEFT_DELAY;
1700         }
1701
1702         if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
1703             LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
1704             LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
1705             LEFT.br_state == new->br_state &&
1706             LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1707                 state |= BMAP_LEFT_CONTIG;
1708
1709         /*
1710          * Check and set flags if this segment has a right neighbor.
1711          * Don't set contiguous if the combined extent would be too large.
1712          * Also check for all-three-contiguous being too large.
1713          */
1714         if (bma->idx < xfs_iext_count(ifp) - 1) {
1715                 state |= BMAP_RIGHT_VALID;
1716                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx + 1), &RIGHT);
1717
1718                 if (isnullstartblock(RIGHT.br_startblock))
1719                         state |= BMAP_RIGHT_DELAY;
1720         }
1721
1722         if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
1723             new_endoff == RIGHT.br_startoff &&
1724             new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
1725             new->br_state == RIGHT.br_state &&
1726             new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
1727             ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
1728                        BMAP_RIGHT_FILLING)) !=
1729                       (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
1730                        BMAP_RIGHT_FILLING) ||
1731              LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
1732                         <= MAXEXTLEN))
1733                 state |= BMAP_RIGHT_CONTIG;
1734
1735         error = 0;
1736         /*
1737          * Switch out based on the FILLING and CONTIG state bits.
1738          */
1739         switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
1740                          BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
1741         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
1742              BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1743                 /*
1744                  * Filling in all of a previously delayed allocation extent.
1745                  * The left and right neighbors are both contiguous with new.
1746                  */
1747                 bma->idx--;
1748                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1749                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
1750                         LEFT.br_blockcount + PREV.br_blockcount +
1751                         RIGHT.br_blockcount);
1752                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1753
1754                 xfs_iext_remove(bma->ip, bma->idx + 1, 2, state);
1755                 (*nextents)--;
1756                 if (bma->cur == NULL)
1757                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1758                 else {
1759                         rval = XFS_ILOG_CORE;
1760                         error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
1761                                         RIGHT.br_startblock,
1762                                         RIGHT.br_blockcount, &i);
1763                         if (error)
1764                                 goto done;
1765                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1766                         error = xfs_btree_delete(bma->cur, &i);
1767                         if (error)
1768                                 goto done;
1769                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1770                         error = xfs_btree_decrement(bma->cur, 0, &i);
1771                         if (error)
1772                                 goto done;
1773                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1774                         error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
1775                                         LEFT.br_startblock,
1776                                         LEFT.br_blockcount +
1777                                         PREV.br_blockcount +
1778                                         RIGHT.br_blockcount, LEFT.br_state);
1779                         if (error)
1780                                 goto done;
1781                 }
1782                 break;
1783
1784         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1785                 /*
1786                  * Filling in all of a previously delayed allocation extent.
1787                  * The left neighbor is contiguous, the right is not.
1788                  */
1789                 bma->idx--;
1790
1791                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1792                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
1793                         LEFT.br_blockcount + PREV.br_blockcount);
1794                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1795
1796                 xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
1797                 if (bma->cur == NULL)
1798                         rval = XFS_ILOG_DEXT;
1799                 else {
1800                         rval = 0;
1801                         error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
1802                                         LEFT.br_startblock, LEFT.br_blockcount,
1803                                         &i);
1804                         if (error)
1805                                 goto done;
1806                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1807                         error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
1808                                         LEFT.br_startblock,
1809                                         LEFT.br_blockcount +
1810                                         PREV.br_blockcount, LEFT.br_state);
1811                         if (error)
1812                                 goto done;
1813                 }
1814                 break;
1815
1816         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1817                 /*
1818                  * Filling in all of a previously delayed allocation extent.
1819                  * The right neighbor is contiguous, the left is not.
1820                  */
1821                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1822                 xfs_bmbt_set_startblock(ep, new->br_startblock);
1823                 xfs_bmbt_set_blockcount(ep,
1824                         PREV.br_blockcount + RIGHT.br_blockcount);
1825                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1826
1827                 xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
1828                 if (bma->cur == NULL)
1829                         rval = XFS_ILOG_DEXT;
1830                 else {
1831                         rval = 0;
1832                         error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
1833                                         RIGHT.br_startblock,
1834                                         RIGHT.br_blockcount, &i);
1835                         if (error)
1836                                 goto done;
1837                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1838                         error = xfs_bmbt_update(bma->cur, PREV.br_startoff,
1839                                         new->br_startblock,
1840                                         PREV.br_blockcount +
1841                                         RIGHT.br_blockcount, PREV.br_state);
1842                         if (error)
1843                                 goto done;
1844                 }
1845                 break;
1846
1847         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
1848                 /*
1849                  * Filling in all of a previously delayed allocation extent.
1850                  * Neither the left nor right neighbors are contiguous with
1851                  * the new one.
1852                  */
1853                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1854                 xfs_bmbt_set_startblock(ep, new->br_startblock);
1855                 xfs_bmbt_set_state(ep, new->br_state);
1856                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1857
1858                 (*nextents)++;
1859                 if (bma->cur == NULL)
1860                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1861                 else {
1862                         rval = XFS_ILOG_CORE;
1863                         error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
1864                                         new->br_startblock, new->br_blockcount,
1865                                         &i);
1866                         if (error)
1867                                 goto done;
1868                         XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
1869                         bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
1870                         error = xfs_btree_insert(bma->cur, &i);
1871                         if (error)
1872                                 goto done;
1873                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1874                 }
1875                 break;
1876
1877         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
1878                 /*
1879                  * Filling in the first part of a previous delayed allocation.
1880                  * The left neighbor is contiguous.
1881                  */
1882                 trace_xfs_bmap_pre_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
1883                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx - 1),
1884                         LEFT.br_blockcount + new->br_blockcount);
1885                 xfs_bmbt_set_startoff(ep,
1886                         PREV.br_startoff + new->br_blockcount);
1887                 trace_xfs_bmap_post_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
1888
1889                 temp = PREV.br_blockcount - new->br_blockcount;
1890                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1891                 xfs_bmbt_set_blockcount(ep, temp);
1892                 if (bma->cur == NULL)
1893                         rval = XFS_ILOG_DEXT;
1894                 else {
1895                         rval = 0;
1896                         error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
1897                                         LEFT.br_startblock, LEFT.br_blockcount,
1898                                         &i);
1899                         if (error)
1900                                 goto done;
1901                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1902                         error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
1903                                         LEFT.br_startblock,
1904                                         LEFT.br_blockcount +
1905                                         new->br_blockcount,
1906                                         LEFT.br_state);
1907                         if (error)
1908                                 goto done;
1909                 }
1910                 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
1911                         startblockval(PREV.br_startblock));
1912                 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
1913                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1914
1915                 bma->idx--;
1916                 break;
1917
1918         case BMAP_LEFT_FILLING:
1919                 /*
1920                  * Filling in the first part of a previous delayed allocation.
1921                  * The left neighbor is not contiguous.
1922                  */
1923                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1924                 xfs_bmbt_set_startoff(ep, new_endoff);
1925                 temp = PREV.br_blockcount - new->br_blockcount;
1926                 xfs_bmbt_set_blockcount(ep, temp);
1927                 xfs_iext_insert(bma->ip, bma->idx, 1, new, state);
1928                 (*nextents)++;
1929                 if (bma->cur == NULL)
1930                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1931                 else {
1932                         rval = XFS_ILOG_CORE;
1933                         error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
1934                                         new->br_startblock, new->br_blockcount,
1935                                         &i);
1936                         if (error)
1937                                 goto done;
1938                         XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
1939                         bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
1940                         error = xfs_btree_insert(bma->cur, &i);
1941                         if (error)
1942                                 goto done;
1943                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1944                 }
1945
1946                 if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
1947                         error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
1948                                         bma->firstblock, bma->dfops,
1949                                         &bma->cur, 1, &tmp_rval, whichfork);
1950                         rval |= tmp_rval;
1951                         if (error)
1952                                 goto done;
1953                 }
1954                 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
1955                         startblockval(PREV.br_startblock) -
1956                         (bma->cur ? bma->cur->bc_private.b.allocated : 0));
1957                 ep = xfs_iext_get_ext(ifp, bma->idx + 1);
1958                 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
1959                 trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
1960                 break;
1961
1962         case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1963                 /*
1964                  * Filling in the last part of a previous delayed allocation.
1965                  * The right neighbor is contiguous with the new allocation.
1966                  */
1967                 temp = PREV.br_blockcount - new->br_blockcount;
1968                 trace_xfs_bmap_pre_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
1969                 xfs_bmbt_set_blockcount(ep, temp);
1970                 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx + 1),
1971                         new->br_startoff, new->br_startblock,
1972                         new->br_blockcount + RIGHT.br_blockcount,
1973                         RIGHT.br_state);
1974                 trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
1975                 if (bma->cur == NULL)
1976                         rval = XFS_ILOG_DEXT;
1977                 else {
1978                         rval = 0;
1979                         error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
1980                                         RIGHT.br_startblock,
1981                                         RIGHT.br_blockcount, &i);
1982                         if (error)
1983                                 goto done;
1984                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1985                         error = xfs_bmbt_update(bma->cur, new->br_startoff,
1986                                         new->br_startblock,
1987                                         new->br_blockcount +
1988                                         RIGHT.br_blockcount,
1989                                         RIGHT.br_state);
1990                         if (error)
1991                                 goto done;
1992                 }
1993
1994                 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
1995                         startblockval(PREV.br_startblock));
1996                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1997                 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
1998                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1999
2000                 bma->idx++;
2001                 break;
2002
2003         case BMAP_RIGHT_FILLING:
2004                 /*
2005                  * Filling in the last part of a previous delayed allocation.
2006                  * The right neighbor is not contiguous.
2007                  */
2008                 temp = PREV.br_blockcount - new->br_blockcount;
2009                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
2010                 xfs_bmbt_set_blockcount(ep, temp);
2011                 xfs_iext_insert(bma->ip, bma->idx + 1, 1, new, state);
2012                 (*nextents)++;
2013                 if (bma->cur == NULL)
2014                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
2015                 else {
2016                         rval = XFS_ILOG_CORE;
2017                         error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
2018                                         new->br_startblock, new->br_blockcount,
2019                                         &i);
2020                         if (error)
2021                                 goto done;
2022                         XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
2023                         bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
2024                         error = xfs_btree_insert(bma->cur, &i);
2025                         if (error)
2026                                 goto done;
2027                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2028                 }
2029
2030                 if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
2031                         error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
2032                                 bma->firstblock, bma->dfops, &bma->cur, 1,
2033                                 &tmp_rval, whichfork);
2034                         rval |= tmp_rval;
2035                         if (error)
2036                                 goto done;
2037                 }
2038                 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
2039                         startblockval(PREV.br_startblock) -
2040                         (bma->cur ? bma->cur->bc_private.b.allocated : 0));
2041                 ep = xfs_iext_get_ext(ifp, bma->idx);
2042                 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
2043                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
2044
2045                 bma->idx++;
2046                 break;
2047
2048         case 0:
2049                 /*
2050                  * Filling in the middle part of a previous delayed allocation.
2051                  * Contiguity is impossible here.
2052                  * This case is avoided almost all the time.
2053                  *
2054                  * We start with a delayed allocation:
2055                  *
2056                  * +ddddddddddddddddddddddddddddddddddddddddddddddddddddddd+
2057                  *  PREV @ idx
2058                  *
2059                  * and we are allocating:
2060                  *                     +rrrrrrrrrrrrrrrrr+
2061                  *                            new
2062                  *
2063                  * and we set it up for insertion as:
2064                  * +ddddddddddddddddddd+rrrrrrrrrrrrrrrrr+ddddddddddddddddd+
2065                  *                            new
2066                  *  PREV @ idx          LEFT              RIGHT
2067                  *                      inserted at idx + 1
2068                  */
2069                 temp = new->br_startoff - PREV.br_startoff;
2070                 temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
2071                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, 0, _THIS_IP_);
2072                 xfs_bmbt_set_blockcount(ep, temp);      /* truncate PREV */
2073                 LEFT = *new;
2074                 RIGHT.br_state = PREV.br_state;
2075                 RIGHT.br_startblock = nullstartblock(
2076                                 (int)xfs_bmap_worst_indlen(bma->ip, temp2));
2077                 RIGHT.br_startoff = new_endoff;
2078                 RIGHT.br_blockcount = temp2;
2079                 /* insert LEFT (r[0]) and RIGHT (r[1]) at the same time */
2080                 xfs_iext_insert(bma->ip, bma->idx + 1, 2, &LEFT, state);
2081                 (*nextents)++;
2082                 if (bma->cur == NULL)
2083                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
2084                 else {
2085                         rval = XFS_ILOG_CORE;
2086                         error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
2087                                         new->br_startblock, new->br_blockcount,
2088                                         &i);
2089                         if (error)
2090                                 goto done;
2091                         XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
2092                         bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
2093                         error = xfs_btree_insert(bma->cur, &i);
2094                         if (error)
2095                                 goto done;
2096                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2097                 }
2098
2099                 if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
2100                         error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
2101                                         bma->firstblock, bma->dfops, &bma->cur,
2102                                         1, &tmp_rval, whichfork);
2103                         rval |= tmp_rval;
2104                         if (error)
2105                                 goto done;
2106                 }
2107                 temp = xfs_bmap_worst_indlen(bma->ip, temp);
2108                 temp2 = xfs_bmap_worst_indlen(bma->ip, temp2);
2109                 diff = (int)(temp + temp2 - startblockval(PREV.br_startblock) -
2110                         (bma->cur ? bma->cur->bc_private.b.allocated : 0));
2111                 if (diff > 0) {
2112                         error = xfs_mod_fdblocks(bma->ip->i_mount,
2113                                                  -((int64_t)diff), false);
2114                         ASSERT(!error);
2115                         if (error)
2116                                 goto done;
2117                 }
2118
2119                 ep = xfs_iext_get_ext(ifp, bma->idx);
2120                 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
2121                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
2122                 trace_xfs_bmap_pre_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
2123                 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, bma->idx + 2),
2124                         nullstartblock((int)temp2));
2125                 trace_xfs_bmap_post_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
2126
2127                 bma->idx++;
2128                 da_new = temp + temp2;
2129                 break;
2130
2131         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
2132         case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
2133         case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
2134         case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
2135         case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
2136         case BMAP_LEFT_CONTIG:
2137         case BMAP_RIGHT_CONTIG:
2138                 /*
2139                  * These cases are all impossible.
2140                  */
2141                 ASSERT(0);
2142         }
2143
2144         /* add reverse mapping */
2145         error = xfs_rmap_map_extent(mp, bma->dfops, bma->ip, whichfork, new);
2146         if (error)
2147                 goto done;
2148
2149         /* convert to a btree if necessary */
2150         if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
2151                 int     tmp_logflags;   /* partial log flag return val */
2152
2153                 ASSERT(bma->cur == NULL);
2154                 error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
2155                                 bma->firstblock, bma->dfops, &bma->cur,
2156                                 da_old > 0, &tmp_logflags, whichfork);
2157                 bma->logflags |= tmp_logflags;
2158                 if (error)
2159                         goto done;
2160         }
2161
2162         /* adjust for changes in reserved delayed indirect blocks */
2163         if (da_old || da_new) {
2164                 temp = da_new;
2165                 if (bma->cur)
2166                         temp += bma->cur->bc_private.b.allocated;
2167                 ASSERT(temp <= da_old);
2168                 if (temp < da_old)
2169                         xfs_mod_fdblocks(bma->ip->i_mount,
2170                                         (int64_t)(da_old - temp), false);
2171         }
2172
2173         /* clear out the allocated field, done with it now in any case. */
2174         if (bma->cur)
2175                 bma->cur->bc_private.b.allocated = 0;
2176
2177         xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork);
2178 done:
2179         if (whichfork != XFS_COW_FORK)
2180                 bma->logflags |= rval;
2181         return error;
2182 #undef  LEFT
2183 #undef  RIGHT
2184 #undef  PREV
2185 }
2186
2187 /*
2188  * Convert an unwritten allocation to a real allocation or vice versa.
2189  */
2190 STATIC int                              /* error */
2191 xfs_bmap_add_extent_unwritten_real(
2192         struct xfs_trans        *tp,
2193         xfs_inode_t             *ip,    /* incore inode pointer */
2194         int                     whichfork,
2195         xfs_extnum_t            *idx,   /* extent number to update/insert */
2196         xfs_btree_cur_t         **curp, /* if *curp is null, not a btree */
2197         xfs_bmbt_irec_t         *new,   /* new data to add to file extents */
2198         xfs_fsblock_t           *first, /* pointer to firstblock variable */
2199         struct xfs_defer_ops    *dfops, /* list of extents to be freed */
2200         int                     *logflagsp) /* inode logging flags */
2201 {
2202         xfs_btree_cur_t         *cur;   /* btree cursor */
2203         xfs_bmbt_rec_host_t     *ep;    /* extent entry for idx */
2204         int                     error;  /* error return value */
2205         int                     i;      /* temp state */
2206         xfs_ifork_t             *ifp;   /* inode fork pointer */
2207         xfs_fileoff_t           new_endoff;     /* end offset of new entry */
2208         xfs_exntst_t            newext; /* new extent state */
2209         xfs_exntst_t            oldext; /* old extent state */
2210         xfs_bmbt_irec_t         r[3];   /* neighbor extent entries */
2211                                         /* left is 0, right is 1, prev is 2 */
2212         int                     rval=0; /* return value (logging flags) */
2213         int                     state = 0;/* state bits, accessed thru macros */
2214         struct xfs_mount        *mp = ip->i_mount;
2215
2216         *logflagsp = 0;
2217
2218         cur = *curp;
2219         ifp = XFS_IFORK_PTR(ip, whichfork);
2220         if (whichfork == XFS_COW_FORK)
2221                 state |= BMAP_COWFORK;
2222
2223         ASSERT(*idx >= 0);
2224         ASSERT(*idx <= xfs_iext_count(ifp));
2225         ASSERT(!isnullstartblock(new->br_startblock));
2226
2227         XFS_STATS_INC(mp, xs_add_exlist);
2228
2229 #define LEFT            r[0]
2230 #define RIGHT           r[1]
2231 #define PREV            r[2]
2232
2233         /*
2234          * Set up a bunch of variables to make the tests simpler.
2235          */
2236         error = 0;
2237         ep = xfs_iext_get_ext(ifp, *idx);
2238         xfs_bmbt_get_all(ep, &PREV);
2239         newext = new->br_state;
2240         oldext = (newext == XFS_EXT_UNWRITTEN) ?
2241                 XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
2242         ASSERT(PREV.br_state == oldext);
2243         new_endoff = new->br_startoff + new->br_blockcount;
2244         ASSERT(PREV.br_startoff <= new->br_startoff);
2245         ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
2246
2247         /*
2248          * Set flags determining what part of the previous oldext allocation
2249          * extent is being replaced by a newext allocation.
2250          */
2251         if (PREV.br_startoff == new->br_startoff)
2252                 state |= BMAP_LEFT_FILLING;
2253         if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
2254                 state |= BMAP_RIGHT_FILLING;
2255
2256         /*
2257          * Check and set flags if this segment has a left neighbor.
2258          * Don't set contiguous if the combined extent would be too large.
2259          */
2260         if (*idx > 0) {
2261                 state |= BMAP_LEFT_VALID;
2262                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &LEFT);
2263
2264                 if (isnullstartblock(LEFT.br_startblock))
2265                         state |= BMAP_LEFT_DELAY;
2266         }
2267
2268         if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
2269             LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
2270             LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
2271             LEFT.br_state == newext &&
2272             LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
2273                 state |= BMAP_LEFT_CONTIG;
2274
2275         /*
2276          * Check and set flags if this segment has a right neighbor.
2277          * Don't set contiguous if the combined extent would be too large.
2278          * Also check for all-three-contiguous being too large.
2279          */
2280         if (*idx < xfs_iext_count(ifp) - 1) {
2281                 state |= BMAP_RIGHT_VALID;
2282                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx + 1), &RIGHT);
2283                 if (isnullstartblock(RIGHT.br_startblock))
2284                         state |= BMAP_RIGHT_DELAY;
2285         }
2286
2287         if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
2288             new_endoff == RIGHT.br_startoff &&
2289             new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
2290             newext == RIGHT.br_state &&
2291             new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
2292             ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
2293                        BMAP_RIGHT_FILLING)) !=
2294                       (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
2295                        BMAP_RIGHT_FILLING) ||
2296              LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
2297                         <= MAXEXTLEN))
2298                 state |= BMAP_RIGHT_CONTIG;
2299
2300         /*
2301          * Switch out based on the FILLING and CONTIG state bits.
2302          */
2303         switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
2304                          BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
2305         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
2306              BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
2307                 /*
2308                  * Setting all of a previous oldext extent to newext.
2309                  * The left and right neighbors are both contiguous with new.
2310                  */
2311                 --*idx;
2312
2313                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2314                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
2315                         LEFT.br_blockcount + PREV.br_blockcount +
2316                         RIGHT.br_blockcount);
2317                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2318
2319                 xfs_iext_remove(ip, *idx + 1, 2, state);
2320                 XFS_IFORK_NEXT_SET(ip, whichfork,
2321                                 XFS_IFORK_NEXTENTS(ip, whichfork) - 2);
2322                 if (cur == NULL)
2323                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
2324                 else {
2325                         rval = XFS_ILOG_CORE;
2326                         if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
2327                                         RIGHT.br_startblock,
2328                                         RIGHT.br_blockcount, &i)))
2329                                 goto done;
2330                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2331                         if ((error = xfs_btree_delete(cur, &i)))
2332                                 goto done;
2333                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2334                         if ((error = xfs_btree_decrement(cur, 0, &i)))
2335                                 goto done;
2336                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2337                         if ((error = xfs_btree_delete(cur, &i)))
2338                                 goto done;
2339                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2340                         if ((error = xfs_btree_decrement(cur, 0, &i)))
2341                                 goto done;
2342                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2343                         if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
2344                                 LEFT.br_startblock,
2345                                 LEFT.br_blockcount + PREV.br_blockcount +
2346                                 RIGHT.br_blockcount, LEFT.br_state)))
2347                                 goto done;
2348                 }
2349                 break;
2350
2351         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
2352                 /*
2353                  * Setting all of a previous oldext extent to newext.
2354                  * The left neighbor is contiguous, the right is not.
2355                  */
2356                 --*idx;
2357
2358                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2359                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
2360                         LEFT.br_blockcount + PREV.br_blockcount);
2361                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2362
2363                 xfs_iext_remove(ip, *idx + 1, 1, state);
2364                 XFS_IFORK_NEXT_SET(ip, whichfork,
2365                                 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2366                 if (cur == NULL)
2367                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
2368                 else {
2369                         rval = XFS_ILOG_CORE;
2370                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
2371                                         PREV.br_startblock, PREV.br_blockcount,
2372                                         &i)))
2373                                 goto done;
2374                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2375                         if ((error = xfs_btree_delete(cur, &i)))
2376                                 goto done;
2377                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2378                         if ((error = xfs_btree_decrement(cur, 0, &i)))
2379                                 goto done;
2380                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2381                         if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
2382                                 LEFT.br_startblock,
2383                                 LEFT.br_blockcount + PREV.br_blockcount,
2384                                 LEFT.br_state)))
2385                                 goto done;
2386                 }
2387                 break;
2388
2389         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
2390                 /*
2391                  * Setting all of a previous oldext extent to newext.
2392                  * The right neighbor is contiguous, the left is not.
2393                  */
2394                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2395                 xfs_bmbt_set_blockcount(ep,
2396                         PREV.br_blockcount + RIGHT.br_blockcount);
2397                 xfs_bmbt_set_state(ep, newext);
2398                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2399                 xfs_iext_remove(ip, *idx + 1, 1, state);
2400                 XFS_IFORK_NEXT_SET(ip, whichfork,
2401                                 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2402                 if (cur == NULL)
2403                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
2404                 else {
2405                         rval = XFS_ILOG_CORE;
2406                         if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
2407                                         RIGHT.br_startblock,
2408                                         RIGHT.br_blockcount, &i)))
2409                                 goto done;
2410                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2411                         if ((error = xfs_btree_delete(cur, &i)))
2412                                 goto done;
2413                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2414                         if ((error = xfs_btree_decrement(cur, 0, &i)))
2415                                 goto done;
2416                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2417                         if ((error = xfs_bmbt_update(cur, new->br_startoff,
2418                                 new->br_startblock,
2419                                 new->br_blockcount + RIGHT.br_blockcount,
2420                                 newext)))
2421                                 goto done;
2422                 }
2423                 break;
2424
2425         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
2426                 /*
2427                  * Setting all of a previous oldext extent to newext.
2428                  * Neither the left nor right neighbors are contiguous with
2429                  * the new one.
2430                  */
2431                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2432                 xfs_bmbt_set_state(ep, newext);
2433                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2434
2435                 if (cur == NULL)
2436                         rval = XFS_ILOG_DEXT;
2437                 else {
2438                         rval = 0;
2439                         if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
2440                                         new->br_startblock, new->br_blockcount,
2441                                         &i)))
2442                                 goto done;
2443                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2444                         if ((error = xfs_bmbt_update(cur, new->br_startoff,
2445                                 new->br_startblock, new->br_blockcount,
2446                                 newext)))
2447                                 goto done;
2448                 }
2449                 break;
2450
2451         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
2452                 /*
2453                  * Setting the first part of a previous oldext extent to newext.
2454                  * The left neighbor is contiguous.
2455                  */
2456                 trace_xfs_bmap_pre_update(ip, *idx - 1, state, _THIS_IP_);
2457                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx - 1),
2458                         LEFT.br_blockcount + new->br_blockcount);
2459                 xfs_bmbt_set_startoff(ep,
2460                         PREV.br_startoff + new->br_blockcount);
2461                 trace_xfs_bmap_post_update(ip, *idx - 1, state, _THIS_IP_);
2462
2463                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2464                 xfs_bmbt_set_startblock(ep,
2465                         new->br_startblock + new->br_blockcount);
2466                 xfs_bmbt_set_blockcount(ep,
2467                         PREV.br_blockcount - new->br_blockcount);
2468                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2469
2470                 --*idx;
2471
2472                 if (cur == NULL)
2473                         rval = XFS_ILOG_DEXT;
2474                 else {
2475                         rval = 0;
2476                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
2477                                         PREV.br_startblock, PREV.br_blockcount,
2478                                         &i)))
2479                                 goto done;
2480                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2481                         if ((error = xfs_bmbt_update(cur,
2482                                 PREV.br_startoff + new->br_blockcount,
2483                                 PREV.br_startblock + new->br_blockcount,
2484                                 PREV.br_blockcount - new->br_blockcount,
2485                                 oldext)))
2486                                 goto done;
2487                         if ((error = xfs_btree_decrement(cur, 0, &i)))
2488                                 goto done;
2489                         error = xfs_bmbt_update(cur, LEFT.br_startoff,
2490                                 LEFT.br_startblock,
2491                                 LEFT.br_blockcount + new->br_blockcount,
2492                                 LEFT.br_state);
2493                         if (error)
2494                                 goto done;
2495                 }
2496                 break;
2497
2498         case BMAP_LEFT_FILLING:
2499                 /*
2500                  * Setting the first part of a previous oldext extent to newext.
2501                  * The left neighbor is not contiguous.
2502                  */
2503                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2504                 ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
2505                 xfs_bmbt_set_startoff(ep, new_endoff);
2506                 xfs_bmbt_set_blockcount(ep,
2507                         PREV.br_blockcount - new->br_blockcount);
2508                 xfs_bmbt_set_startblock(ep,
2509                         new->br_startblock + new->br_blockcount);
2510                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2511
2512                 xfs_iext_insert(ip, *idx, 1, new, state);
2513                 XFS_IFORK_NEXT_SET(ip, whichfork,
2514                                 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
2515                 if (cur == NULL)
2516                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
2517                 else {
2518                         rval = XFS_ILOG_CORE;
2519                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
2520                                         PREV.br_startblock, PREV.br_blockcount,
2521                                         &i)))
2522                                 goto done;
2523                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2524                         if ((error = xfs_bmbt_update(cur,
2525                                 PREV.br_startoff + new->br_blockcount,
2526                                 PREV.br_startblock + new->br_blockcount,
2527                                 PREV.br_blockcount - new->br_blockcount,
2528                                 oldext)))
2529                                 goto done;
2530                         cur->bc_rec.b = *new;
2531                         if ((error = xfs_btree_insert(cur, &i)))
2532                                 goto done;
2533                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2534                 }
2535                 break;
2536
2537         case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
2538                 /*
2539                  * Setting the last part of a previous oldext extent to newext.
2540                  * The right neighbor is contiguous with the new allocation.
2541                  */
2542                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2543                 xfs_bmbt_set_blockcount(ep,
2544                         PREV.br_blockcount - new->br_blockcount);
2545                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2546
2547                 ++*idx;
2548
2549                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2550                 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
2551                         new->br_startoff, new->br_startblock,
2552                         new->br_blockcount + RIGHT.br_blockcount, newext);
2553                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2554
2555                 if (cur == NULL)
2556                         rval = XFS_ILOG_DEXT;
2557                 else {
2558                         rval = 0;
2559                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
2560                                         PREV.br_startblock,
2561                                         PREV.br_blockcount, &i)))
2562                                 goto done;
2563                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2564                         if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
2565                                 PREV.br_startblock,
2566                                 PREV.br_blockcount - new->br_blockcount,
2567                                 oldext)))
2568                                 goto done;
2569                         if ((error = xfs_btree_increment(cur, 0, &i)))
2570                                 goto done;
2571                         if ((error = xfs_bmbt_update(cur, new->br_startoff,
2572                                 new->br_startblock,
2573                                 new->br_blockcount + RIGHT.br_blockcount,
2574                                 newext)))
2575                                 goto done;
2576                 }
2577                 break;
2578
2579         case BMAP_RIGHT_FILLING:
2580                 /*
2581                  * Setting the last part of a previous oldext extent to newext.
2582                  * The right neighbor is not contiguous.
2583                  */
2584                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2585                 xfs_bmbt_set_blockcount(ep,
2586                         PREV.br_blockcount - new->br_blockcount);
2587                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2588
2589                 ++*idx;
2590                 xfs_iext_insert(ip, *idx, 1, new, state);
2591
2592                 XFS_IFORK_NEXT_SET(ip, whichfork,
2593                                 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
2594                 if (cur == NULL)
2595                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
2596                 else {
2597                         rval = XFS_ILOG_CORE;
2598                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
2599                                         PREV.br_startblock, PREV.br_blockcount,
2600                                         &i)))
2601                                 goto done;
2602                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2603                         if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
2604                                 PREV.br_startblock,
2605                                 PREV.br_blockcount - new->br_blockcount,
2606                                 oldext)))
2607                                 goto done;
2608                         if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
2609                                         new->br_startblock, new->br_blockcount,
2610                                         &i)))
2611                                 goto done;
2612                         XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
2613                         cur->bc_rec.b.br_state = XFS_EXT_NORM;
2614                         if ((error = xfs_btree_insert(cur, &i)))
2615                                 goto done;
2616                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2617                 }
2618                 break;
2619
2620         case 0:
2621                 /*
2622                  * Setting the middle part of a previous oldext extent to
2623                  * newext.  Contiguity is impossible here.
2624                  * One extent becomes three extents.
2625                  */
2626                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2627                 xfs_bmbt_set_blockcount(ep,
2628                         new->br_startoff - PREV.br_startoff);
2629                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2630
2631                 r[0] = *new;
2632                 r[1].br_startoff = new_endoff;
2633                 r[1].br_blockcount =
2634                         PREV.br_startoff + PREV.br_blockcount - new_endoff;
2635                 r[1].br_startblock = new->br_startblock + new->br_blockcount;
2636                 r[1].br_state = oldext;
2637
2638                 ++*idx;
2639                 xfs_iext_insert(ip, *idx, 2, &r[0], state);
2640
2641                 XFS_IFORK_NEXT_SET(ip, whichfork,
2642                                 XFS_IFORK_NEXTENTS(ip, whichfork) + 2);
2643                 if (cur == NULL)
2644                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
2645                 else {
2646                         rval = XFS_ILOG_CORE;
2647                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
2648                                         PREV.br_startblock, PREV.br_blockcount,
2649                                         &i)))
2650                                 goto done;
2651                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2652                         /* new right extent - oldext */
2653                         if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
2654                                 r[1].br_startblock, r[1].br_blockcount,
2655                                 r[1].br_state)))
2656                                 goto done;
2657                         /* new left extent - oldext */
2658                         cur->bc_rec.b = PREV;
2659                         cur->bc_rec.b.br_blockcount =
2660                                 new->br_startoff - PREV.br_startoff;
2661                         if ((error = xfs_btree_insert(cur, &i)))
2662                                 goto done;
2663                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2664                         /*
2665                          * Reset the cursor to the position of the new extent
2666                          * we are about to insert as we can't trust it after
2667                          * the previous insert.
2668                          */
2669                         if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
2670                                         new->br_startblock, new->br_blockcount,
2671                                         &i)))
2672                                 goto done;
2673                         XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
2674                         /* new middle extent - newext */
2675                         cur->bc_rec.b.br_state = new->br_state;
2676                         if ((error = xfs_btree_insert(cur, &i)))
2677                                 goto done;
2678                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2679                 }
2680                 break;
2681
2682         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
2683         case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
2684         case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
2685         case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
2686         case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
2687         case BMAP_LEFT_CONTIG:
2688         case BMAP_RIGHT_CONTIG:
2689                 /*
2690                  * These cases are all impossible.
2691                  */
2692                 ASSERT(0);
2693         }
2694
2695         /* update reverse mappings */
2696         error = xfs_rmap_convert_extent(mp, dfops, ip, whichfork, new);
2697         if (error)
2698                 goto done;
2699
2700         /* convert to a btree if necessary */
2701         if (xfs_bmap_needs_btree(ip, whichfork)) {
2702                 int     tmp_logflags;   /* partial log flag return val */
2703
2704                 ASSERT(cur == NULL);
2705                 error = xfs_bmap_extents_to_btree(tp, ip, first, dfops, &cur,
2706                                 0, &tmp_logflags, whichfork);
2707                 *logflagsp |= tmp_logflags;
2708                 if (error)
2709                         goto done;
2710         }
2711
2712         /* clear out the allocated field, done with it now in any case. */
2713         if (cur) {
2714                 cur->bc_private.b.allocated = 0;
2715                 *curp = cur;
2716         }
2717
2718         xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
2719 done:
2720         *logflagsp |= rval;
2721         return error;
2722 #undef  LEFT
2723 #undef  RIGHT
2724 #undef  PREV
2725 }
2726
2727 /*
2728  * Convert a hole to a delayed allocation.
2729  */
2730 STATIC void
2731 xfs_bmap_add_extent_hole_delay(
2732         xfs_inode_t             *ip,    /* incore inode pointer */
2733         int                     whichfork,
2734         xfs_extnum_t            *idx,   /* extent number to update/insert */
2735         xfs_bmbt_irec_t         *new)   /* new data to add to file extents */
2736 {
2737         xfs_ifork_t             *ifp;   /* inode fork pointer */
2738         xfs_bmbt_irec_t         left;   /* left neighbor extent entry */
2739         xfs_filblks_t           newlen=0;       /* new indirect size */
2740         xfs_filblks_t           oldlen=0;       /* old indirect size */
2741         xfs_bmbt_irec_t         right;  /* right neighbor extent entry */
2742         int                     state;  /* state bits, accessed thru macros */
2743         xfs_filblks_t           temp=0; /* temp for indirect calculations */
2744
2745         ifp = XFS_IFORK_PTR(ip, whichfork);
2746         state = 0;
2747         if (whichfork == XFS_COW_FORK)
2748                 state |= BMAP_COWFORK;
2749         ASSERT(isnullstartblock(new->br_startblock));
2750
2751         /*
2752          * Check and set flags if this segment has a left neighbor
2753          */
2754         if (*idx > 0) {
2755                 state |= BMAP_LEFT_VALID;
2756                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &left);
2757
2758                 if (isnullstartblock(left.br_startblock))
2759                         state |= BMAP_LEFT_DELAY;
2760         }
2761
2762         /*
2763          * Check and set flags if the current (right) segment exists.
2764          * If it doesn't exist, we're converting the hole at end-of-file.
2765          */
2766         if (*idx < xfs_iext_count(ifp)) {
2767                 state |= BMAP_RIGHT_VALID;
2768                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right);
2769
2770                 if (isnullstartblock(right.br_startblock))
2771                         state |= BMAP_RIGHT_DELAY;
2772         }
2773
2774         /*
2775          * Set contiguity flags on the left and right neighbors.
2776          * Don't let extents get too large, even if the pieces are contiguous.
2777          */
2778         if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) &&
2779             left.br_startoff + left.br_blockcount == new->br_startoff &&
2780             left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
2781                 state |= BMAP_LEFT_CONTIG;
2782
2783         if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) &&
2784             new->br_startoff + new->br_blockcount == right.br_startoff &&
2785             new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
2786             (!(state & BMAP_LEFT_CONTIG) ||
2787              (left.br_blockcount + new->br_blockcount +
2788               right.br_blockcount <= MAXEXTLEN)))
2789                 state |= BMAP_RIGHT_CONTIG;
2790
2791         /*
2792          * Switch out based on the contiguity flags.
2793          */
2794         switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
2795         case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
2796                 /*
2797                  * New allocation is contiguous with delayed allocations
2798                  * on the left and on the right.
2799                  * Merge all three into a single extent record.
2800                  */
2801                 --*idx;
2802                 temp = left.br_blockcount + new->br_blockcount +
2803                         right.br_blockcount;
2804
2805                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2806                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
2807                 oldlen = startblockval(left.br_startblock) +
2808                         startblockval(new->br_startblock) +
2809                         startblockval(right.br_startblock);
2810                 newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2811                                          oldlen);
2812                 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
2813                         nullstartblock((int)newlen));
2814                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2815
2816                 xfs_iext_remove(ip, *idx + 1, 1, state);
2817                 break;
2818
2819         case BMAP_LEFT_CONTIG:
2820                 /*
2821                  * New allocation is contiguous with a delayed allocation
2822                  * on the left.
2823                  * Merge the new allocation with the left neighbor.
2824                  */
2825                 --*idx;
2826                 temp = left.br_blockcount + new->br_blockcount;
2827
2828                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2829                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
2830                 oldlen = startblockval(left.br_startblock) +
2831                         startblockval(new->br_startblock);
2832                 newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2833                                          oldlen);
2834                 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
2835                         nullstartblock((int)newlen));
2836                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2837                 break;
2838
2839         case BMAP_RIGHT_CONTIG:
2840                 /*
2841                  * New allocation is contiguous with a delayed allocation
2842                  * on the right.
2843                  * Merge the new allocation with the right neighbor.
2844                  */
2845                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2846                 temp = new->br_blockcount + right.br_blockcount;
2847                 oldlen = startblockval(new->br_startblock) +
2848                         startblockval(right.br_startblock);
2849                 newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2850                                          oldlen);
2851                 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
2852                         new->br_startoff,
2853                         nullstartblock((int)newlen), temp, right.br_state);
2854                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2855                 break;
2856
2857         case 0:
2858                 /*
2859                  * New allocation is not contiguous with another
2860                  * delayed allocation.
2861                  * Insert a new entry.
2862                  */
2863                 oldlen = newlen = 0;
2864                 xfs_iext_insert(ip, *idx, 1, new, state);
2865                 break;
2866         }
2867         if (oldlen != newlen) {
2868                 ASSERT(oldlen > newlen);
2869                 xfs_mod_fdblocks(ip->i_mount, (int64_t)(oldlen - newlen),
2870                                  false);
2871                 /*
2872                  * Nothing to do for disk quota accounting here.
2873                  */
2874         }
2875 }
2876
2877 /*
2878  * Convert a hole to a real allocation.
2879  */
2880 STATIC int                              /* error */
2881 xfs_bmap_add_extent_hole_real(
2882         struct xfs_bmalloca     *bma,
2883         int                     whichfork)
2884 {
2885         struct xfs_bmbt_irec    *new = &bma->got;
2886         int                     error;  /* error return value */
2887         int                     i;      /* temp state */
2888         xfs_ifork_t             *ifp;   /* inode fork pointer */
2889         xfs_bmbt_irec_t         left;   /* left neighbor extent entry */
2890         xfs_bmbt_irec_t         right;  /* right neighbor extent entry */
2891         int                     rval=0; /* return value (logging flags) */
2892         int                     state;  /* state bits, accessed thru macros */
2893         struct xfs_mount        *mp;
2894
2895         mp = bma->ip->i_mount;
2896         ifp = XFS_IFORK_PTR(bma->ip, whichfork);
2897
2898         ASSERT(bma->idx >= 0);
2899         ASSERT(bma->idx <= xfs_iext_count(ifp));
2900         ASSERT(!isnullstartblock(new->br_startblock));
2901         ASSERT(!bma->cur ||
2902                !(bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
2903
2904         XFS_STATS_INC(mp, xs_add_exlist);
2905
2906         state = 0;
2907         if (whichfork == XFS_ATTR_FORK)
2908                 state |= BMAP_ATTRFORK;
2909         if (whichfork == XFS_COW_FORK)
2910                 state |= BMAP_COWFORK;
2911
2912         /*
2913          * Check and set flags if this segment has a left neighbor.
2914          */
2915         if (bma->idx > 0) {
2916                 state |= BMAP_LEFT_VALID;
2917                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &left);
2918                 if (isnullstartblock(left.br_startblock))
2919                         state |= BMAP_LEFT_DELAY;
2920         }
2921
2922         /*
2923          * Check and set flags if this segment has a current value.
2924          * Not true if we're inserting into the "hole" at eof.
2925          */
2926         if (bma->idx < xfs_iext_count(ifp)) {
2927                 state |= BMAP_RIGHT_VALID;
2928                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &right);
2929                 if (isnullstartblock(right.br_startblock))
2930                         state |= BMAP_RIGHT_DELAY;
2931         }
2932
2933         /*
2934          * We're inserting a real allocation between "left" and "right".
2935          * Set the contiguity flags.  Don't let extents get too large.
2936          */
2937         if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
2938             left.br_startoff + left.br_blockcount == new->br_startoff &&
2939             left.br_startblock + left.br_blockcount == new->br_startblock &&
2940             left.br_state == new->br_state &&
2941             left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
2942                 state |= BMAP_LEFT_CONTIG;
2943
2944         if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
2945             new->br_startoff + new->br_blockcount == right.br_startoff &&
2946             new->br_startblock + new->br_blockcount == right.br_startblock &&
2947             new->br_state == right.br_state &&
2948             new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
2949             (!(state & BMAP_LEFT_CONTIG) ||
2950              left.br_blockcount + new->br_blockcount +
2951              right.br_blockcount <= MAXEXTLEN))
2952                 state |= BMAP_RIGHT_CONTIG;
2953
2954         error = 0;
2955         /*
2956          * Select which case we're in here, and implement it.
2957          */
2958         switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
2959         case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
2960                 /*
2961                  * New allocation is contiguous with real allocations on the
2962                  * left and on the right.
2963                  * Merge all three into a single extent record.
2964                  */
2965                 --bma->idx;
2966                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
2967                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
2968                         left.br_blockcount + new->br_blockcount +
2969                         right.br_blockcount);
2970                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
2971
2972                 xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
2973
2974                 XFS_IFORK_NEXT_SET(bma->ip, whichfork,
2975                         XFS_IFORK_NEXTENTS(bma->ip, whichfork) - 1);
2976                 if (bma->cur == NULL) {
2977                         rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
2978                 } else {
2979                         rval = XFS_ILOG_CORE;
2980                         error = xfs_bmbt_lookup_eq(bma->cur, right.br_startoff,
2981                                         right.br_startblock, right.br_blockcount,
2982                                         &i);
2983                         if (error)
2984                                 goto done;
2985                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2986                         error = xfs_btree_delete(bma->cur, &i);
2987                         if (error)
2988                                 goto done;
2989                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2990                         error = xfs_btree_decrement(bma->cur, 0, &i);
2991                         if (error)
2992                                 goto done;
2993                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2994                         error = xfs_bmbt_update(bma->cur, left.br_startoff,
2995                                         left.br_startblock,
2996                                         left.br_blockcount +
2997                                                 new->br_blockcount +
2998                                                 right.br_blockcount,
2999                                         left.br_state);
3000                         if (error)
3001                                 goto done;
3002                 }
3003                 break;
3004
3005         case BMAP_LEFT_CONTIG:
3006                 /*
3007                  * New allocation is contiguous with a real allocation
3008                  * on the left.
3009                  * Merge the new allocation with the left neighbor.
3010                  */
3011                 --bma->idx;
3012                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
3013                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
3014                         left.br_blockcount + new->br_blockcount);
3015                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
3016
3017                 if (bma->cur == NULL) {
3018                         rval = xfs_ilog_fext(whichfork);
3019                 } else {
3020                         rval = 0;
3021                         error = xfs_bmbt_lookup_eq(bma->cur, left.br_startoff,
3022                                         left.br_startblock, left.br_blockcount,
3023                                         &i);
3024                         if (error)
3025                                 goto done;
3026                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
3027                         error = xfs_bmbt_update(bma->cur, left.br_startoff,
3028                                         left.br_startblock,
3029                                         left.br_blockcount +
3030                                                 new->br_blockcount,
3031                                         left.br_state);
3032                         if (error)
3033                                 goto done;
3034                 }
3035                 break;
3036
3037         case BMAP_RIGHT_CONTIG:
3038                 /*
3039                  * New allocation is contiguous with a real allocation
3040                  * on the right.
3041                  * Merge the new allocation with the right neighbor.
3042                  */
3043                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
3044                 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx),
3045                         new->br_startoff, new->br_startblock,
3046                         new->br_blockcount + right.br_blockcount,
3047                         right.br_state);
3048                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
3049
3050                 if (bma->cur == NULL) {
3051                         rval = xfs_ilog_fext(whichfork);
3052                 } else {
3053                         rval = 0;
3054                         error = xfs_bmbt_lookup_eq(bma->cur,
3055                                         right.br_startoff,
3056                                         right.br_startblock,
3057                                         right.br_blockcount, &i);
3058                         if (error)
3059                                 goto done;
3060                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
3061                         error = xfs_bmbt_update(bma->cur, new->br_startoff,
3062                                         new->br_startblock,
3063                                         new->br_blockcount +
3064                                                 right.br_blockcount,
3065                                         right.br_state);
3066                         if (error)
3067                                 goto done;
3068                 }
3069                 break;
3070
3071         case 0:
3072                 /*
3073                  * New allocation is not contiguous with another
3074                  * real allocation.
3075                  * Insert a new entry.
3076                  */
3077                 xfs_iext_insert(bma->ip, bma->idx, 1, new, state);
3078                 XFS_IFORK_NEXT_SET(bma->ip, whichfork,
3079                         XFS_IFORK_NEXTENTS(bma->ip, whichfork) + 1);
3080                 if (bma->cur == NULL) {
3081                         rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
3082                 } else {
3083                         rval = XFS_ILOG_CORE;
3084                         error = xfs_bmbt_lookup_eq(bma->cur,
3085                                         new->br_startoff,
3086                                         new->br_startblock,
3087                                         new->br_blockcount, &i);
3088                         if (error)
3089                                 goto done;
3090                         XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
3091                         bma->cur->bc_rec.b.br_state = new->br_state;
3092                         error = xfs_btree_insert(bma->cur, &i);
3093                         if (error)
3094                                 goto done;
3095                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
3096                 }
3097                 break;
3098         }
3099
3100         /* add reverse mapping */
3101         error = xfs_rmap_map_extent(mp, bma->dfops, bma->ip, whichfork, new);
3102         if (error)
3103                 goto done;
3104
3105         /* convert to a btree if necessary */
3106         if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
3107                 int     tmp_logflags;   /* partial log flag return val */
3108
3109                 ASSERT(bma->cur == NULL);
3110                 error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
3111                                 bma->firstblock, bma->dfops, &bma->cur,
3112                                 0, &tmp_logflags, whichfork);
3113                 bma->logflags |= tmp_logflags;
3114                 if (error)
3115                         goto done;
3116         }
3117
3118         /* clear out the allocated field, done with it now in any case. */
3119         if (bma->cur)
3120                 bma->cur->bc_private.b.allocated = 0;
3121
3122         xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork);
3123 done:
3124         bma->logflags |= rval;
3125         return error;
3126 }
3127
3128 /*
3129  * Functions used in the extent read, allocate and remove paths
3130  */
3131
3132 /*
3133  * Adjust the size of the new extent based on di_extsize and rt extsize.
3134  */
3135 int
3136 xfs_bmap_extsize_align(
3137         xfs_mount_t     *mp,
3138         xfs_bmbt_irec_t *gotp,          /* next extent pointer */
3139         xfs_bmbt_irec_t *prevp,         /* previous extent pointer */
3140         xfs_extlen_t    extsz,          /* align to this extent size */
3141         int             rt,             /* is this a realtime inode? */
3142         int             eof,            /* is extent at end-of-file? */
3143         int             delay,          /* creating delalloc extent? */
3144         int             convert,        /* overwriting unwritten extent? */
3145         xfs_fileoff_t   *offp,          /* in/out: aligned offset */
3146         xfs_extlen_t    *lenp)          /* in/out: aligned length */
3147 {
3148         xfs_fileoff_t   orig_off;       /* original offset */
3149         xfs_extlen_t    orig_alen;      /* original length */
3150         xfs_fileoff_t   orig_end;       /* original off+len */
3151         xfs_fileoff_t   nexto;          /* next file offset */
3152         xfs_fileoff_t   prevo;          /* previous file offset */
3153         xfs_fileoff_t   align_off;      /* temp for offset */
3154         xfs_extlen_t    align_alen;     /* temp for length */
3155         xfs_extlen_t    temp;           /* temp for calculations */
3156
3157         if (convert)
3158                 return 0;
3159
3160         orig_off = align_off = *offp;
3161         orig_alen = align_alen = *lenp;
3162         orig_end = orig_off + orig_alen;
3163
3164         /*
3165          * If this request overlaps an existing extent, then don't
3166          * attempt to perform any additional alignment.
3167          */
3168         if (!delay && !eof &&
3169             (orig_off >= gotp->br_startoff) &&
3170             (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
3171                 return 0;
3172         }
3173
3174         /*
3175          * If the file offset is unaligned vs. the extent size
3176          * we need to align it.  This will be possible unless
3177          * the file was previously written with a kernel that didn't
3178          * perform this alignment, or if a truncate shot us in the
3179          * foot.
3180          */
3181         temp = do_mod(orig_off, extsz);
3182         if (temp) {
3183                 align_alen += temp;
3184                 align_off -= temp;
3185         }
3186
3187         /* Same adjustment for the end of the requested area. */
3188         temp = (align_alen % extsz);
3189         if (temp)
3190                 align_alen += extsz - temp;
3191
3192         /*
3193          * For large extent hint sizes, the aligned extent might be larger than
3194          * MAXEXTLEN. In that case, reduce the size by an extsz so that it pulls
3195          * the length back under MAXEXTLEN. The outer allocation loops handle
3196          * short allocation just fine, so it is safe to do this. We only want to
3197          * do it when we are forced to, though, because it means more allocation
3198          * operations are required.
3199          */
3200         while (align_alen > MAXEXTLEN)
3201                 align_alen -= extsz;
3202         ASSERT(align_alen <= MAXEXTLEN);
3203
3204         /*
3205          * If the previous block overlaps with this proposed allocation
3206          * then move the start forward without adjusting the length.
3207          */
3208         if (prevp->br_startoff != NULLFILEOFF) {
3209                 if (prevp->br_startblock == HOLESTARTBLOCK)
3210                         prevo = prevp->br_startoff;
3211                 else
3212                         prevo = prevp->br_startoff + prevp->br_blockcount;
3213         } else
3214                 prevo = 0;
3215         if (align_off != orig_off && align_off < prevo)
3216                 align_off = prevo;
3217         /*
3218          * If the next block overlaps with this proposed allocation
3219          * then move the start back without adjusting the length,
3220          * but not before offset 0.
3221          * This may of course make the start overlap previous block,
3222          * and if we hit the offset 0 limit then the next block
3223          * can still overlap too.
3224          */
3225         if (!eof && gotp->br_startoff != NULLFILEOFF) {
3226                 if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
3227                     (!delay && gotp->br_startblock == DELAYSTARTBLOCK))
3228                         nexto = gotp->br_startoff + gotp->br_blockcount;
3229                 else
3230                         nexto = gotp->br_startoff;
3231         } else
3232                 nexto = NULLFILEOFF;
3233         if (!eof &&
3234             align_off + align_alen != orig_end &&
3235             align_off + align_alen > nexto)
3236                 align_off = nexto > align_alen ? nexto - align_alen : 0;
3237         /*
3238          * If we're now overlapping the next or previous extent that
3239          * means we can't fit an extsz piece in this hole.  Just move
3240          * the start forward to the first valid spot and set
3241          * the length so we hit the end.
3242          */
3243         if (align_off != orig_off && align_off < prevo)
3244                 align_off = prevo;
3245         if (align_off + align_alen != orig_end &&
3246             align_off + align_alen > nexto &&
3247             nexto != NULLFILEOFF) {
3248                 ASSERT(nexto > prevo);
3249                 align_alen = nexto - align_off;
3250         }
3251
3252         /*
3253          * If realtime, and the result isn't a multiple of the realtime
3254          * extent size we need to remove blocks until it is.
3255          */
3256         if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
3257                 /*
3258                  * We're not covering the original request, or
3259                  * we won't be able to once we fix the length.
3260                  */
3261                 if (orig_off < align_off ||
3262                     orig_end > align_off + align_alen ||
3263                     align_alen - temp < orig_alen)
3264                         return -EINVAL;
3265                 /*
3266                  * Try to fix it by moving the start up.
3267                  */
3268                 if (align_off + temp <= orig_off) {
3269                         align_alen -= temp;
3270                         align_off += temp;
3271                 }
3272                 /*
3273                  * Try to fix it by moving the end in.
3274                  */
3275                 else if (align_off + align_alen - temp >= orig_end)
3276                         align_alen -= temp;
3277                 /*
3278                  * Set the start to the minimum then trim the length.
3279                  */
3280                 else {
3281                         align_alen -= orig_off - align_off;
3282                         align_off = orig_off;
3283                         align_alen -= align_alen % mp->m_sb.sb_rextsize;
3284                 }
3285                 /*
3286                  * Result doesn't cover the request, fail it.
3287                  */
3288                 if (orig_off < align_off || orig_end > align_off + align_alen)
3289                         return -EINVAL;
3290         } else {
3291                 ASSERT(orig_off >= align_off);
3292                 /* see MAXEXTLEN handling above */
3293                 ASSERT(orig_end <= align_off + align_alen ||
3294                        align_alen + extsz > MAXEXTLEN);
3295         }
3296
3297 #ifdef DEBUG
3298         if (!eof && gotp->br_startoff != NULLFILEOFF)
3299                 ASSERT(align_off + align_alen <= gotp->br_startoff);
3300         if (prevp->br_startoff != NULLFILEOFF)
3301                 ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
3302 #endif
3303
3304         *lenp = align_alen;
3305         *offp = align_off;
3306         return 0;
3307 }
3308
3309 #define XFS_ALLOC_GAP_UNITS     4
3310
3311 void
3312 xfs_bmap_adjacent(
3313         struct xfs_bmalloca     *ap)    /* bmap alloc argument struct */
3314 {
3315         xfs_fsblock_t   adjust;         /* adjustment to block numbers */
3316         xfs_agnumber_t  fb_agno;        /* ag number of ap->firstblock */
3317         xfs_mount_t     *mp;            /* mount point structure */
3318         int             nullfb;         /* true if ap->firstblock isn't set */
3319         int             rt;             /* true if inode is realtime */
3320
3321 #define ISVALID(x,y)    \
3322         (rt ? \
3323                 (x) < mp->m_sb.sb_rblocks : \
3324                 XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
3325                 XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
3326                 XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
3327
3328         mp = ap->ip->i_mount;
3329         nullfb = *ap->firstblock == NULLFSBLOCK;
3330         rt = XFS_IS_REALTIME_INODE(ap->ip) &&
3331                 xfs_alloc_is_userdata(ap->datatype);
3332         fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock);
3333         /*
3334          * If allocating at eof, and there's a previous real block,
3335          * try to use its last block as our starting point.
3336          */
3337         if (ap->eof && ap->prev.br_startoff != NULLFILEOFF &&
3338             !isnullstartblock(ap->prev.br_startblock) &&
3339             ISVALID(ap->prev.br_startblock + ap->prev.br_blockcount,
3340                     ap->prev.br_startblock)) {
3341                 ap->blkno = ap->prev.br_startblock + ap->prev.br_blockcount;
3342                 /*
3343                  * Adjust for the gap between prevp and us.
3344                  */
3345                 adjust = ap->offset -
3346                         (ap->prev.br_startoff + ap->prev.br_blockcount);
3347                 if (adjust &&
3348                     ISVALID(ap->blkno + adjust, ap->prev.br_startblock))
3349                         ap->blkno += adjust;
3350         }
3351         /*
3352          * If not at eof, then compare the two neighbor blocks.
3353          * Figure out whether either one gives us a good starting point,
3354          * and pick the better one.
3355          */
3356         else if (!ap->eof) {
3357                 xfs_fsblock_t   gotbno;         /* right side block number */
3358                 xfs_fsblock_t   gotdiff=0;      /* right side difference */
3359                 xfs_fsblock_t   prevbno;        /* left side block number */
3360                 xfs_fsblock_t   prevdiff=0;     /* left side difference */
3361
3362                 /*
3363                  * If there's a previous (left) block, select a requested
3364                  * start block based on it.
3365                  */
3366                 if (ap->prev.br_startoff != NULLFILEOFF &&
3367                     !isnullstartblock(ap->prev.br_startblock) &&
3368                     (prevbno = ap->prev.br_startblock +
3369                                ap->prev.br_blockcount) &&
3370                     ISVALID(prevbno, ap->prev.br_startblock)) {
3371                         /*
3372                          * Calculate gap to end of previous block.
3373                          */
3374                         adjust = prevdiff = ap->offset -
3375                                 (ap->prev.br_startoff +
3376                                  ap->prev.br_blockcount);
3377                         /*
3378                          * Figure the startblock based on the previous block's
3379                          * end and the gap size.
3380                          * Heuristic!
3381                          * If the gap is large relative to the piece we're
3382                          * allocating, or using it gives us an invalid block
3383                          * number, then just use the end of the previous block.
3384                          */
3385                         if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
3386                             ISVALID(prevbno + prevdiff,
3387                                     ap->prev.br_startblock))
3388                                 prevbno += adjust;
3389                         else
3390                                 prevdiff += adjust;
3391                         /*
3392                          * If the firstblock forbids it, can't use it,
3393                          * must use default.
3394                          */
3395                         if (!rt && !nullfb &&
3396                             XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
3397                                 prevbno = NULLFSBLOCK;
3398                 }
3399                 /*
3400                  * No previous block or can't follow it, just default.
3401                  */
3402                 else
3403                         prevbno = NULLFSBLOCK;
3404                 /*
3405                  * If there's a following (right) block, select a requested
3406                  * start block based on it.
3407                  */
3408                 if (!isnullstartblock(ap->got.br_startblock)) {
3409                         /*
3410                          * Calculate gap to start of next block.
3411                          */
3412                         adjust = gotdiff = ap->got.br_startoff - ap->offset;
3413                         /*
3414                          * Figure the startblock based on the next block's
3415                          * start and the gap size.
3416                          */
3417                         gotbno = ap->got.br_startblock;
3418                         /*
3419                          * Heuristic!
3420                          * If the gap is large relative to the piece we're
3421                          * allocating, or using it gives us an invalid block
3422                          * number, then just use the start of the next block
3423                          * offset by our length.
3424                          */
3425                         if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
3426                             ISVALID(gotbno - gotdiff, gotbno))
3427                                 gotbno -= adjust;
3428                         else if (ISVALID(gotbno - ap->length, gotbno)) {
3429                                 gotbno -= ap->length;
3430                                 gotdiff += adjust - ap->length;
3431                         } else
3432                                 gotdiff += adjust;
3433                         /*
3434                          * If the firstblock forbids it, can't use it,
3435                          * must use default.
3436                          */
3437                         if (!rt && !nullfb &&
3438                             XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
3439                                 gotbno = NULLFSBLOCK;
3440                 }
3441                 /*
3442                  * No next block, just default.
3443                  */
3444                 else
3445                         gotbno = NULLFSBLOCK;
3446                 /*
3447                  * If both valid, pick the better one, else the only good
3448                  * one, else ap->blkno is already set (to 0 or the inode block).
3449                  */
3450                 if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
3451                         ap->blkno = prevdiff <= gotdiff ? prevbno : gotbno;
3452                 else if (prevbno != NULLFSBLOCK)
3453                         ap->blkno = prevbno;
3454                 else if (gotbno != NULLFSBLOCK)
3455                         ap->blkno = gotbno;
3456         }
3457 #undef ISVALID
3458 }
3459
3460 static int
3461 xfs_bmap_longest_free_extent(
3462         struct xfs_trans        *tp,
3463         xfs_agnumber_t          ag,
3464         xfs_extlen_t            *blen,
3465         int                     *notinit)
3466 {
3467         struct xfs_mount        *mp = tp->t_mountp;
3468         struct xfs_perag        *pag;
3469         xfs_extlen_t            longest;
3470         int                     error = 0;
3471
3472         pag = xfs_perag_get(mp, ag);
3473         if (!pag->pagf_init) {
3474                 error = xfs_alloc_pagf_init(mp, tp, ag, XFS_ALLOC_FLAG_TRYLOCK);
3475                 if (error)
3476                         goto out;
3477
3478                 if (!pag->pagf_init) {
3479                         *notinit = 1;
3480                         goto out;
3481                 }
3482         }
3483
3484         longest = xfs_alloc_longest_free_extent(mp, pag,
3485                                 xfs_alloc_min_freelist(mp, pag),
3486                                 xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE));
3487         if (*blen < longest)
3488                 *blen = longest;
3489
3490 out:
3491         xfs_perag_put(pag);
3492         return error;
3493 }
3494
3495 static void
3496 xfs_bmap_select_minlen(
3497         struct xfs_bmalloca     *ap,
3498         struct xfs_alloc_arg    *args,
3499         xfs_extlen_t            *blen,
3500         int                     notinit)
3501 {
3502         if (notinit || *blen < ap->minlen) {
3503                 /*
3504                  * Since we did a BUF_TRYLOCK above, it is possible that
3505                  * there is space for this request.
3506                  */
3507                 args->minlen = ap->minlen;
3508         } else if (*blen < args->maxlen) {
3509                 /*
3510                  * If the best seen length is less than the request length,
3511                  * use the best as the minimum.
3512                  */
3513                 args->minlen = *blen;
3514         } else {
3515                 /*
3516                  * Otherwise we've seen an extent as big as maxlen, use that
3517                  * as the minimum.
3518                  */
3519                 args->minlen = args->maxlen;
3520         }
3521 }
3522
3523 STATIC int
3524 xfs_bmap_btalloc_nullfb(
3525         struct xfs_bmalloca     *ap,
3526         struct xfs_alloc_arg    *args,
3527         xfs_extlen_t            *blen)
3528 {
3529         struct xfs_mount        *mp = ap->ip->i_mount;
3530         xfs_agnumber_t          ag, startag;
3531         int                     notinit = 0;
3532         int                     error;
3533
3534         args->type = XFS_ALLOCTYPE_START_BNO;
3535         args->total = ap->total;
3536
3537         startag = ag = XFS_FSB_TO_AGNO(mp, args->fsbno);
3538         if (startag == NULLAGNUMBER)
3539                 startag = ag = 0;
3540
3541         while (*blen < args->maxlen) {
3542                 error = xfs_bmap_longest_free_extent(args->tp, ag, blen,
3543                                                      &notinit);
3544                 if (error)
3545                         return error;
3546
3547                 if (++ag == mp->m_sb.sb_agcount)
3548                         ag = 0;
3549                 if (ag == startag)
3550                         break;
3551         }
3552
3553         xfs_bmap_select_minlen(ap, args, blen, notinit);
3554         return 0;
3555 }
3556
3557 STATIC int
3558 xfs_bmap_btalloc_filestreams(
3559         struct xfs_bmalloca     *ap,
3560         struct xfs_alloc_arg    *args,
3561         xfs_extlen_t            *blen)
3562 {
3563         struct xfs_mount        *mp = ap->ip->i_mount;
3564         xfs_agnumber_t          ag;
3565         int                     notinit = 0;
3566         int                     error;
3567
3568         args->type = XFS_ALLOCTYPE_NEAR_BNO;
3569         args->total = ap->total;
3570
3571         ag = XFS_FSB_TO_AGNO(mp, args->fsbno);
3572         if (ag == NULLAGNUMBER)
3573                 ag = 0;
3574
3575         error = xfs_bmap_longest_free_extent(args->tp, ag, blen, &notinit);
3576         if (error)
3577                 return error;
3578
3579         if (*blen < args->maxlen) {
3580                 error = xfs_filestream_new_ag(ap, &ag);
3581                 if (error)
3582                         return error;
3583
3584                 error = xfs_bmap_longest_free_extent(args->tp, ag, blen,
3585                                                      &notinit);
3586                 if (error)
3587                         return error;
3588
3589         }
3590
3591         xfs_bmap_select_minlen(ap, args, blen, notinit);
3592
3593         /*
3594          * Set the failure fallback case to look in the selected AG as stream
3595          * may have moved.
3596          */
3597         ap->blkno = args->fsbno = XFS_AGB_TO_FSB(mp, ag, 0);
3598         return 0;
3599 }
3600
3601 STATIC int
3602 xfs_bmap_btalloc(
3603         struct xfs_bmalloca     *ap)    /* bmap alloc argument struct */
3604 {
3605         xfs_mount_t     *mp;            /* mount point structure */
3606         xfs_alloctype_t atype = 0;      /* type for allocation routines */
3607         xfs_extlen_t    align = 0;      /* minimum allocation alignment */
3608         xfs_agnumber_t  fb_agno;        /* ag number of ap->firstblock */
3609         xfs_agnumber_t  ag;
3610         xfs_alloc_arg_t args;
3611         xfs_extlen_t    blen;
3612         xfs_extlen_t    nextminlen = 0;
3613         int             nullfb;         /* true if ap->firstblock isn't set */
3614         int             isaligned;
3615         int             tryagain;
3616         int             error;
3617         int             stripe_align;
3618
3619         ASSERT(ap->length);
3620
3621         mp = ap->ip->i_mount;
3622
3623         /* stripe alignment for allocation is determined by mount parameters */
3624         stripe_align = 0;
3625         if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC))
3626                 stripe_align = mp->m_swidth;
3627         else if (mp->m_dalign)
3628                 stripe_align = mp->m_dalign;
3629
3630         if (ap->flags & XFS_BMAPI_COWFORK)
3631                 align = xfs_get_cowextsz_hint(ap->ip);
3632         else if (xfs_alloc_is_userdata(ap->datatype))
3633                 align = xfs_get_extsz_hint(ap->ip);
3634         if (align) {
3635                 error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
3636                                                 align, 0, ap->eof, 0, ap->conv,
3637                                                 &ap->offset, &ap->length);
3638                 ASSERT(!error);
3639                 ASSERT(ap->length);
3640         }
3641
3642
3643         nullfb = *ap->firstblock == NULLFSBLOCK;
3644         fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock);
3645         if (nullfb) {
3646                 if (xfs_alloc_is_userdata(ap->datatype) &&
3647                     xfs_inode_is_filestream(ap->ip)) {
3648                         ag = xfs_filestream_lookup_ag(ap->ip);
3649                         ag = (ag != NULLAGNUMBER) ? ag : 0;
3650                         ap->blkno = XFS_AGB_TO_FSB(mp, ag, 0);
3651                 } else {
3652                         ap->blkno = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
3653                 }
3654         } else
3655                 ap->blkno = *ap->firstblock;
3656
3657         xfs_bmap_adjacent(ap);
3658
3659         /*
3660          * If allowed, use ap->blkno; otherwise must use firstblock since
3661          * it's in the right allocation group.
3662          */
3663         if (nullfb || XFS_FSB_TO_AGNO(mp, ap->blkno) == fb_agno)
3664                 ;
3665         else
3666                 ap->blkno = *ap->firstblock;
3667         /*
3668          * Normal allocation, done through xfs_alloc_vextent.
3669          */
3670         tryagain = isaligned = 0;
3671         memset(&args, 0, sizeof(args));
3672         args.tp = ap->tp;
3673         args.mp = mp;
3674         args.fsbno = ap->blkno;
3675         xfs_rmap_skip_owner_update(&args.oinfo);
3676
3677         /* Trim the allocation back to the maximum an AG can fit. */
3678         args.maxlen = MIN(ap->length, mp->m_ag_max_usable);
3679         args.firstblock = *ap->firstblock;
3680         blen = 0;
3681         if (nullfb) {
3682                 /*
3683                  * Search for an allocation group with a single extent large
3684                  * enough for the request.  If one isn't found, then adjust
3685                  * the minimum allocation size to the largest space found.
3686                  */
3687                 if (xfs_alloc_is_userdata(ap->datatype) &&
3688                     xfs_inode_is_filestream(ap->ip))
3689                         error = xfs_bmap_btalloc_filestreams(ap, &args, &blen);
3690                 else
3691                         error = xfs_bmap_btalloc_nullfb(ap, &args, &blen);
3692                 if (error)
3693                         return error;
3694         } else if (ap->dfops->dop_low) {
3695                 if (xfs_inode_is_filestream(ap->ip))
3696                         args.type = XFS_ALLOCTYPE_FIRST_AG;
3697                 else
3698                         args.type = XFS_ALLOCTYPE_START_BNO;
3699                 args.total = args.minlen = ap->minlen;
3700         } else {
3701                 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3702                 args.total = ap->total;
3703                 args.minlen = ap->minlen;
3704         }
3705         /* apply extent size hints if obtained earlier */
3706         if (align) {
3707                 args.prod = align;
3708                 if ((args.mod = (xfs_extlen_t)do_mod(ap->offset, args.prod)))
3709                         args.mod = (xfs_extlen_t)(args.prod - args.mod);
3710         } else if (mp->m_sb.sb_blocksize >= PAGE_SIZE) {
3711                 args.prod = 1;
3712                 args.mod = 0;
3713         } else {
3714                 args.prod = PAGE_SIZE >> mp->m_sb.sb_blocklog;
3715                 if ((args.mod = (xfs_extlen_t)(do_mod(ap->offset, args.prod))))
3716                         args.mod = (xfs_extlen_t)(args.prod - args.mod);
3717         }
3718         /*
3719          * If we are not low on available data blocks, and the
3720          * underlying logical volume manager is a stripe, and
3721          * the file offset is zero then try to allocate data
3722          * blocks on stripe unit boundary.
3723          * NOTE: ap->aeof is only set if the allocation length
3724          * is >= the stripe unit and the allocation offset is
3725          * at the end of file.
3726          */
3727         if (!ap->dfops->dop_low && ap->aeof) {
3728                 if (!ap->offset) {
3729                         args.alignment = stripe_align;
3730                         atype = args.type;
3731                         isaligned = 1;
3732                         /*
3733                          * Adjust for alignment
3734                          */
3735                         if (blen > args.alignment && blen <= args.maxlen)
3736                                 args.minlen = blen - args.alignment;
3737                         args.minalignslop = 0;
3738                 } else {
3739                         /*
3740                          * First try an exact bno allocation.
3741                          * If it fails then do a near or start bno
3742                          * allocation with alignment turned on.
3743                          */
3744                         atype = args.type;
3745                         tryagain = 1;
3746                         args.type = XFS_ALLOCTYPE_THIS_BNO;
3747                         args.alignment = 1;
3748                         /*
3749                          * Compute the minlen+alignment for the
3750                          * next case.  Set slop so that the value
3751                          * of minlen+alignment+slop doesn't go up
3752                          * between the calls.
3753                          */
3754                         if (blen > stripe_align && blen <= args.maxlen)
3755                                 nextminlen = blen - stripe_align;
3756                         else
3757                                 nextminlen = args.minlen;
3758                         if (nextminlen + stripe_align > args.minlen + 1)
3759                                 args.minalignslop =
3760                                         nextminlen + stripe_align -
3761                                         args.minlen - 1;
3762                         else
3763                                 args.minalignslop = 0;
3764                 }
3765         } else {
3766                 args.alignment = 1;
3767                 args.minalignslop = 0;
3768         }
3769         args.minleft = ap->minleft;
3770         args.wasdel = ap->wasdel;
3771         args.resv = XFS_AG_RESV_NONE;
3772         args.datatype = ap->datatype;
3773         if (ap->datatype & XFS_ALLOC_USERDATA_ZERO)
3774                 args.ip = ap->ip;
3775
3776         error = xfs_alloc_vextent(&args);
3777         if (error)
3778                 return error;
3779
3780         if (tryagain && args.fsbno == NULLFSBLOCK) {
3781                 /*
3782                  * Exact allocation failed. Now try with alignment
3783                  * turned on.
3784                  */
3785                 args.type = atype;
3786                 args.fsbno = ap->blkno;
3787                 args.alignment = stripe_align;
3788                 args.minlen = nextminlen;
3789                 args.minalignslop = 0;
3790                 isaligned = 1;
3791                 if ((error = xfs_alloc_vextent(&args)))
3792                         return error;
3793         }
3794         if (isaligned && args.fsbno == NULLFSBLOCK) {
3795                 /*
3796                  * allocation failed, so turn off alignment and
3797                  * try again.
3798                  */
3799                 args.type = atype;
3800                 args.fsbno = ap->blkno;
3801                 args.alignment = 0;
3802                 if ((error = xfs_alloc_vextent(&args)))
3803                         return error;
3804         }
3805         if (args.fsbno == NULLFSBLOCK && nullfb &&
3806             args.minlen > ap->minlen) {
3807                 args.minlen = ap->minlen;
3808                 args.type = XFS_ALLOCTYPE_START_BNO;
3809                 args.fsbno = ap->blkno;
3810                 if ((error = xfs_alloc_vextent(&args)))
3811                         return error;
3812         }
3813         if (args.fsbno == NULLFSBLOCK && nullfb) {
3814                 args.fsbno = 0;
3815                 args.type = XFS_ALLOCTYPE_FIRST_AG;
3816                 args.total = ap->minlen;
3817                 if ((error = xfs_alloc_vextent(&args)))
3818                         return error;
3819                 ap->dfops->dop_low = true;
3820         }
3821         if (args.fsbno != NULLFSBLOCK) {
3822                 /*
3823                  * check the allocation happened at the same or higher AG than
3824                  * the first block that was allocated.
3825                  */
3826                 ASSERT(*ap->firstblock == NULLFSBLOCK ||
3827                        XFS_FSB_TO_AGNO(mp, *ap->firstblock) <=
3828                        XFS_FSB_TO_AGNO(mp, args.fsbno));
3829
3830                 ap->blkno = args.fsbno;
3831                 if (*ap->firstblock == NULLFSBLOCK)
3832                         *ap->firstblock = args.fsbno;
3833                 ASSERT(nullfb || fb_agno <= args.agno);
3834                 ap->length = args.len;
3835                 if (!(ap->flags & XFS_BMAPI_COWFORK))
3836                         ap->ip->i_d.di_nblocks += args.len;
3837                 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
3838                 if (ap->wasdel)
3839                         ap->ip->i_delayed_blks -= args.len;
3840                 /*
3841                  * Adjust the disk quota also. This was reserved
3842                  * earlier.
3843                  */
3844                 xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
3845                         ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
3846                                         XFS_TRANS_DQ_BCOUNT,
3847                         (long) args.len);
3848         } else {
3849                 ap->blkno = NULLFSBLOCK;
3850                 ap->length = 0;
3851         }
3852         return 0;
3853 }
3854
3855 /*
3856  * For a remap operation, just "allocate" an extent at the address that the
3857  * caller passed in, and ensure that the AGFL is the right size.  The caller
3858  * will then map the "allocated" extent into the file somewhere.
3859  */
3860 STATIC int
3861 xfs_bmap_remap_alloc(
3862         struct xfs_bmalloca     *ap)
3863 {
3864         struct xfs_trans        *tp = ap->tp;
3865         struct xfs_mount        *mp = tp->t_mountp;
3866         xfs_agblock_t           bno;
3867         struct xfs_alloc_arg    args;
3868         int                     error;
3869
3870         /*
3871          * validate that the block number is legal - the enables us to detect
3872          * and handle a silent filesystem corruption rather than crashing.
3873          */
3874         memset(&args, 0, sizeof(struct xfs_alloc_arg));
3875         args.tp = ap->tp;
3876         args.mp = ap->tp->t_mountp;
3877         bno = *ap->firstblock;
3878         args.agno = XFS_FSB_TO_AGNO(mp, bno);
3879         args.agbno = XFS_FSB_TO_AGBNO(mp, bno);
3880         if (args.agno >= mp->m_sb.sb_agcount ||
3881             args.agbno >= mp->m_sb.sb_agblocks)
3882                 return -EFSCORRUPTED;
3883
3884         /* "Allocate" the extent from the range we passed in. */
3885         trace_xfs_bmap_remap_alloc(ap->ip, *ap->firstblock, ap->length);
3886         ap->blkno = bno;
3887         ap->ip->i_d.di_nblocks += ap->length;
3888         xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
3889
3890         /* Fix the freelist, like a real allocator does. */
3891         args.datatype = ap->datatype;
3892         args.pag = xfs_perag_get(args.mp, args.agno);
3893         ASSERT(args.pag);
3894
3895         /*
3896          * The freelist fixing code will decline the allocation if
3897          * the size and shape of the free space doesn't allow for
3898          * allocating the extent and updating all the metadata that
3899          * happens during an allocation.  We're remapping, not
3900          * allocating, so skip that check by pretending to be freeing.
3901          */
3902         error = xfs_alloc_fix_freelist(&args, XFS_ALLOC_FLAG_FREEING);
3903         xfs_perag_put(args.pag);
3904         if (error)
3905                 trace_xfs_bmap_remap_alloc_error(ap->ip, error, _RET_IP_);
3906         return error;
3907 }
3908
3909 /*
3910  * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
3911  * It figures out where to ask the underlying allocator to put the new extent.
3912  */
3913 STATIC int
3914 xfs_bmap_alloc(
3915         struct xfs_bmalloca     *ap)    /* bmap alloc argument struct */
3916 {
3917         if (ap->flags & XFS_BMAPI_REMAP)
3918                 return xfs_bmap_remap_alloc(ap);
3919         if (XFS_IS_REALTIME_INODE(ap->ip) &&
3920             xfs_alloc_is_userdata(ap->datatype))
3921                 return xfs_bmap_rtalloc(ap);
3922         return xfs_bmap_btalloc(ap);
3923 }
3924
3925 /* Trim extent to fit a logical block range. */
3926 void
3927 xfs_trim_extent(
3928         struct xfs_bmbt_irec    *irec,
3929         xfs_fileoff_t           bno,
3930         xfs_filblks_t           len)
3931 {
3932         xfs_fileoff_t           distance;
3933         xfs_fileoff_t           end = bno + len;
3934
3935         if (irec->br_startoff + irec->br_blockcount <= bno ||
3936             irec->br_startoff >= end) {
3937                 irec->br_blockcount = 0;
3938                 return;
3939         }
3940
3941         if (irec->br_startoff < bno) {
3942                 distance = bno - irec->br_startoff;
3943                 if (isnullstartblock(irec->br_startblock))
3944                         irec->br_startblock = DELAYSTARTBLOCK;
3945                 if (irec->br_startblock != DELAYSTARTBLOCK &&
3946                     irec->br_startblock != HOLESTARTBLOCK)
3947                         irec->br_startblock += distance;
3948                 irec->br_startoff += distance;
3949                 irec->br_blockcount -= distance;
3950         }
3951
3952         if (end < irec->br_startoff + irec->br_blockcount) {
3953                 distance = irec->br_startoff + irec->br_blockcount - end;
3954                 irec->br_blockcount -= distance;
3955         }
3956 }
3957
3958 /*
3959  * Trim the returned map to the required bounds
3960  */
3961 STATIC void
3962 xfs_bmapi_trim_map(
3963         struct xfs_bmbt_irec    *mval,
3964         struct xfs_bmbt_irec    *got,
3965         xfs_fileoff_t           *bno,
3966         xfs_filblks_t           len,
3967         xfs_fileoff_t           obno,
3968         xfs_fileoff_t           end,
3969         int                     n,
3970         int                     flags)
3971 {
3972         if ((flags & XFS_BMAPI_ENTIRE) ||
3973             got->br_startoff + got->br_blockcount <= obno) {
3974                 *mval = *got;
3975                 if (isnullstartblock(got->br_startblock))
3976                         mval->br_startblock = DELAYSTARTBLOCK;
3977                 return;
3978         }
3979
3980         if (obno > *bno)
3981                 *bno = obno;
3982         ASSERT((*bno >= obno) || (n == 0));
3983         ASSERT(*bno < end);
3984         mval->br_startoff = *bno;
3985         if (isnullstartblock(got->br_startblock))
3986                 mval->br_startblock = DELAYSTARTBLOCK;
3987         else
3988                 mval->br_startblock = got->br_startblock +
3989                                         (*bno - got->br_startoff);
3990         /*
3991          * Return the minimum of what we got and what we asked for for
3992          * the length.  We can use the len variable here because it is
3993          * modified below and we could have been there before coming
3994          * here if the first part of the allocation didn't overlap what
3995          * was asked for.
3996          */
3997         mval->br_blockcount = XFS_FILBLKS_MIN(end - *bno,
3998                         got->br_blockcount - (*bno - got->br_startoff));
3999         mval->br_state = got->br_state;
4000         ASSERT(mval->br_blockcount <= len);
4001         return;
4002 }
4003
4004 /*
4005  * Update and validate the extent map to return
4006  */
4007 STATIC void
4008 xfs_bmapi_update_map(
4009         struct xfs_bmbt_irec    **map,
4010         xfs_fileoff_t           *bno,
4011         xfs_filblks_t           *len,
4012         xfs_fileoff_t           obno,
4013         xfs_fileoff_t           end,
4014         int                     *n,
4015         int                     flags)
4016 {
4017         xfs_bmbt_irec_t *mval = *map;
4018
4019         ASSERT((flags & XFS_BMAPI_ENTIRE) ||
4020                ((mval->br_startoff + mval->br_blockcount) <= end));
4021         ASSERT((flags & XFS_BMAPI_ENTIRE) || (mval->br_blockcount <= *len) ||
4022                (mval->br_startoff < obno));
4023
4024         *bno = mval->br_startoff + mval->br_blockcount;
4025         *len = end - *bno;
4026         if (*n > 0 && mval->br_startoff == mval[-1].br_startoff) {
4027                 /* update previous map with new information */
4028                 ASSERT(mval->br_startblock == mval[-1].br_startblock);
4029                 ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
4030                 ASSERT(mval->br_state == mval[-1].br_state);
4031                 mval[-1].br_blockcount = mval->br_blockcount;
4032                 mval[-1].br_state = mval->br_state;
4033         } else if (*n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
4034                    mval[-1].br_startblock != DELAYSTARTBLOCK &&
4035                    mval[-1].br_startblock != HOLESTARTBLOCK &&
4036                    mval->br_startblock == mval[-1].br_startblock +
4037                                           mval[-1].br_blockcount &&
4038                    ((flags & XFS_BMAPI_IGSTATE) ||
4039                         mval[-1].br_state == mval->br_state)) {
4040                 ASSERT(mval->br_startoff ==
4041                        mval[-1].br_startoff + mval[-1].br_blockcount);
4042                 mval[-1].br_blockcount += mval->br_blockcount;
4043         } else if (*n > 0 &&
4044                    mval->br_startblock == DELAYSTARTBLOCK &&
4045                    mval[-1].br_startblock == DELAYSTARTBLOCK &&
4046                    mval->br_startoff ==
4047                    mval[-1].br_startoff + mval[-1].br_blockcount) {
4048                 mval[-1].br_blockcount += mval->br_blockcount;
4049                 mval[-1].br_state = mval->br_state;
4050         } else if (!((*n == 0) &&
4051                      ((mval->br_startoff + mval->br_blockcount) <=
4052                       obno))) {
4053                 mval++;
4054                 (*n)++;
4055         }
4056         *map = mval;
4057 }
4058
4059 /*
4060  * Map file blocks to filesystem blocks without allocation.
4061  */
4062 int
4063 xfs_bmapi_read(
4064         struct xfs_inode        *ip,
4065         xfs_fileoff_t           bno,
4066         xfs_filblks_t           len,
4067         struct xfs_bmbt_irec    *mval,
4068         int                     *nmap,
4069         int                     flags)
4070 {
4071         struct xfs_mount        *mp = ip->i_mount;
4072         struct xfs_ifork        *ifp;
4073         struct xfs_bmbt_irec    got;
4074         xfs_fileoff_t           obno;
4075         xfs_fileoff_t           end;
4076         xfs_extnum_t            idx;
4077         int                     error;
4078         bool                    eof = false;
4079         int                     n = 0;
4080         int                     whichfork = xfs_bmapi_whichfork(flags);
4081
4082         ASSERT(*nmap >= 1);
4083         ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK|XFS_BMAPI_ENTIRE|
4084                            XFS_BMAPI_IGSTATE|XFS_BMAPI_COWFORK)));
4085         ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED|XFS_ILOCK_EXCL));
4086
4087         if (unlikely(XFS_TEST_ERROR(
4088             (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4089              XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
4090              mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4091                 XFS_ERROR_REPORT("xfs_bmapi_read", XFS_ERRLEVEL_LOW, mp);
4092                 return -EFSCORRUPTED;
4093         }
4094
4095         if (XFS_FORCED_SHUTDOWN(mp))
4096                 return -EIO;
4097
4098         XFS_STATS_INC(mp, xs_blk_mapr);
4099
4100         ifp = XFS_IFORK_PTR(ip, whichfork);
4101
4102         /* No CoW fork?  Return a hole. */
4103         if (whichfork == XFS_COW_FORK && !ifp) {
4104                 mval->br_startoff = bno;
4105                 mval->br_startblock = HOLESTARTBLOCK;
4106                 mval->br_blockcount = len;
4107                 mval->br_state = XFS_EXT_NORM;
4108                 *nmap = 1;
4109                 return 0;
4110         }
4111
4112         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
4113                 error = xfs_iread_extents(NULL, ip, whichfork);
4114                 if (error)
4115                         return error;
4116         }
4117
4118         if (!xfs_iext_lookup_extent(ip, ifp, bno, &idx, &got))
4119                 eof = true;
4120         end = bno + len;
4121         obno = bno;
4122
4123         while (bno < end && n < *nmap) {
4124                 /* Reading past eof, act as though there's a hole up to end. */
4125                 if (eof)
4126                         got.br_startoff = end;
4127                 if (got.br_startoff > bno) {
4128                         /* Reading in a hole.  */
4129                         mval->br_startoff = bno;
4130                         mval->br_startblock = HOLESTARTBLOCK;
4131                         mval->br_blockcount =
4132                                 XFS_FILBLKS_MIN(len, got.br_startoff - bno);
4133                         mval->br_state = XFS_EXT_NORM;
4134                         bno += mval->br_blockcount;
4135                         len -= mval->br_blockcount;
4136                         mval++;
4137                         n++;
4138                         continue;
4139                 }
4140
4141                 /* set up the extent map to return. */
4142                 xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
4143                 xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
4144
4145                 /* If we're done, stop now. */
4146                 if (bno >= end || n >= *nmap)
4147                         break;
4148
4149                 /* Else go on to the next record. */
4150                 if (!xfs_iext_get_extent(ifp, ++idx, &got))
4151                         eof = true;
4152         }
4153         *nmap = n;
4154         return 0;
4155 }
4156
4157 /*
4158  * Add a delayed allocation extent to an inode. Blocks are reserved from the
4159  * global pool and the extent inserted into the inode in-core extent tree.
4160  *
4161  * On entry, got refers to the first extent beyond the offset of the extent to
4162  * allocate or eof is specified if no such extent exists. On return, got refers
4163  * to the extent record that was inserted to the inode fork.
4164  *
4165  * Note that the allocated extent may have been merged with contiguous extents
4166  * during insertion into the inode fork. Thus, got does not reflect the current
4167  * state of the inode fork on return. If necessary, the caller can use lastx to
4168  * look up the updated record in the inode fork.
4169  */
4170 int
4171 xfs_bmapi_reserve_delalloc(
4172         struct xfs_inode        *ip,
4173         int                     whichfork,
4174         xfs_fileoff_t           off,
4175         xfs_filblks_t           len,
4176         xfs_filblks_t           prealloc,
4177         struct xfs_bmbt_irec    *got,
4178         xfs_extnum_t            *lastx,
4179         int                     eof)
4180 {
4181         struct xfs_mount        *mp = ip->i_mount;
4182         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
4183         xfs_extlen_t            alen;
4184         xfs_extlen_t            indlen;
4185         char                    rt = XFS_IS_REALTIME_INODE(ip);
4186         xfs_extlen_t            extsz;
4187         int                     error;
4188         xfs_fileoff_t           aoff = off;
4189
4190         /*
4191          * Cap the alloc length. Keep track of prealloc so we know whether to
4192          * tag the inode before we return.
4193          */
4194         alen = XFS_FILBLKS_MIN(len + prealloc, MAXEXTLEN);
4195         if (!eof)
4196                 alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff);
4197         if (prealloc && alen >= len)
4198                 prealloc = alen - len;
4199
4200         /* Figure out the extent size, adjust alen */
4201         if (whichfork == XFS_COW_FORK)
4202                 extsz = xfs_get_cowextsz_hint(ip);
4203         else
4204                 extsz = xfs_get_extsz_hint(ip);
4205         if (extsz) {
4206                 struct xfs_bmbt_irec    prev;
4207
4208                 if (!xfs_iext_get_extent(ifp, *lastx - 1, &prev))
4209                         prev.br_startoff = NULLFILEOFF;
4210
4211                 error = xfs_bmap_extsize_align(mp, got, &prev, extsz, rt, eof,
4212                                                1, 0, &aoff, &alen);
4213                 ASSERT(!error);
4214         }
4215
4216         if (rt)
4217                 extsz = alen / mp->m_sb.sb_rextsize;
4218
4219         /*
4220          * Make a transaction-less quota reservation for delayed allocation
4221          * blocks.  This number gets adjusted later.  We return if we haven't
4222          * allocated blocks already inside this loop.
4223          */
4224         error = xfs_trans_reserve_quota_nblks(NULL, ip, (long)alen, 0,
4225                         rt ? XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
4226         if (error)
4227                 return error;
4228
4229         /*
4230          * Split changing sb for alen and indlen since they could be coming
4231          * from different places.
4232          */
4233         indlen = (xfs_extlen_t)xfs_bmap_worst_indlen(ip, alen);
4234         ASSERT(indlen > 0);
4235
4236         if (rt) {
4237                 error = xfs_mod_frextents(mp, -((int64_t)extsz));
4238         } else {
4239                 error = xfs_mod_fdblocks(mp, -((int64_t)alen), false);
4240         }
4241
4242         if (error)
4243                 goto out_unreserve_quota;
4244
4245         error = xfs_mod_fdblocks(mp, -((int64_t)indlen), false);
4246         if (error)
4247                 goto out_unreserve_blocks;
4248
4249
4250         ip->i_delayed_blks += alen;
4251
4252         got->br_startoff = aoff;
4253         got->br_startblock = nullstartblock(indlen);
4254         got->br_blockcount = alen;
4255         got->br_state = XFS_EXT_NORM;
4256
4257         xfs_bmap_add_extent_hole_delay(ip, whichfork, lastx, got);
4258
4259         /*
4260          * Tag the inode if blocks were preallocated. Note that COW fork
4261          * preallocation can occur at the start or end of the extent, even when
4262          * prealloc == 0, so we must also check the aligned offset and length.
4263          */
4264         if (whichfork == XFS_DATA_FORK && prealloc)
4265                 xfs_inode_set_eofblocks_tag(ip);
4266         if (whichfork == XFS_COW_FORK && (prealloc || aoff < off || alen > len))
4267                 xfs_inode_set_cowblocks_tag(ip);
4268
4269         return 0;
4270
4271 out_unreserve_blocks:
4272         if (rt)
4273                 xfs_mod_frextents(mp, extsz);
4274         else
4275                 xfs_mod_fdblocks(mp, alen, false);
4276 out_unreserve_quota:
4277         if (XFS_IS_QUOTA_ON(mp))
4278                 xfs_trans_unreserve_quota_nblks(NULL, ip, (long)alen, 0, rt ?
4279                                 XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
4280         return error;
4281 }
4282
4283 static int
4284 xfs_bmapi_allocate(
4285         struct xfs_bmalloca     *bma)
4286 {
4287         struct xfs_mount        *mp = bma->ip->i_mount;
4288         int                     whichfork = xfs_bmapi_whichfork(bma->flags);
4289         struct xfs_ifork        *ifp = XFS_IFORK_PTR(bma->ip, whichfork);
4290         int                     tmp_logflags = 0;
4291         int                     error;
4292
4293         ASSERT(bma->length > 0);
4294
4295         /*
4296          * For the wasdelay case, we could also just allocate the stuff asked
4297          * for in this bmap call but that wouldn't be as good.
4298          */
4299         if (bma->wasdel) {
4300                 bma->length = (xfs_extlen_t)bma->got.br_blockcount;
4301                 bma->offset = bma->got.br_startoff;
4302                 if (bma->idx) {
4303                         xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1),
4304                                          &bma->prev);
4305                 }
4306         } else {
4307                 bma->length = XFS_FILBLKS_MIN(bma->length, MAXEXTLEN);
4308                 if (!bma->eof)
4309                         bma->length = XFS_FILBLKS_MIN(bma->length,
4310                                         bma->got.br_startoff - bma->offset);
4311         }
4312
4313         /*
4314          * Set the data type being allocated. For the data fork, the first data
4315          * in the file is treated differently to all other allocations. For the
4316          * attribute fork, we only need to ensure the allocated range is not on
4317          * the busy list.
4318          */
4319         if (!(bma->flags & XFS_BMAPI_METADATA)) {
4320                 bma->datatype = XFS_ALLOC_NOBUSY;
4321                 if (whichfork == XFS_DATA_FORK) {
4322                         if (bma->offset == 0)
4323                                 bma->datatype |= XFS_ALLOC_INITIAL_USER_DATA;
4324                         else
4325                                 bma->datatype |= XFS_ALLOC_USERDATA;
4326                 }
4327                 if (bma->flags & XFS_BMAPI_ZERO)
4328                         bma->datatype |= XFS_ALLOC_USERDATA_ZERO;
4329         }
4330
4331         bma->minlen = (bma->flags & XFS_BMAPI_CONTIG) ? bma->length : 1;
4332
4333         /*
4334          * Only want to do the alignment at the eof if it is userdata and
4335          * allocation length is larger than a stripe unit.
4336          */
4337         if (mp->m_dalign && bma->length >= mp->m_dalign &&
4338             !(bma->flags & XFS_BMAPI_METADATA) && whichfork == XFS_DATA_FORK) {
4339                 error = xfs_bmap_isaeof(bma, whichfork);
4340                 if (error)
4341                         return error;
4342         }
4343
4344         error = xfs_bmap_alloc(bma);
4345         if (error)
4346                 return error;
4347
4348         if (bma->cur)
4349                 bma->cur->bc_private.b.firstblock = *bma->firstblock;
4350         if (bma->blkno == NULLFSBLOCK)
4351                 return 0;
4352         if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) {
4353                 bma->cur = xfs_bmbt_init_cursor(mp, bma->tp, bma->ip, whichfork);
4354                 bma->cur->bc_private.b.firstblock = *bma->firstblock;
4355                 bma->cur->bc_private.b.dfops = bma->dfops;
4356         }
4357         /*
4358          * Bump the number of extents we've allocated
4359          * in this call.
4360          */
4361         bma->nallocs++;
4362
4363         if (bma->cur)
4364                 bma->cur->bc_private.b.flags =
4365                         bma->wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
4366
4367         bma->got.br_startoff = bma->offset;
4368         bma->got.br_startblock = bma->blkno;
4369         bma->got.br_blockcount = bma->length;
4370         bma->got.br_state = XFS_EXT_NORM;
4371
4372         /*
4373          * In the data fork, a wasdelay extent has been initialized, so
4374          * shouldn't be flagged as unwritten.
4375          *
4376          * For the cow fork, however, we convert delalloc reservations
4377          * (extents allocated for speculative preallocation) to
4378          * allocated unwritten extents, and only convert the unwritten
4379          * extents to real extents when we're about to write the data.
4380          */
4381         if ((!bma->wasdel || (bma->flags & XFS_BMAPI_COWFORK)) &&
4382             (bma->flags & XFS_BMAPI_PREALLOC) &&
4383             xfs_sb_version_hasextflgbit(&mp->m_sb))
4384                 bma->got.br_state = XFS_EXT_UNWRITTEN;
4385
4386         if (bma->wasdel)
4387                 error = xfs_bmap_add_extent_delay_real(bma, whichfork);
4388         else
4389                 error = xfs_bmap_add_extent_hole_real(bma, whichfork);
4390
4391         bma->logflags |= tmp_logflags;
4392         if (error)
4393                 return error;
4394
4395         /*
4396          * Update our extent pointer, given that xfs_bmap_add_extent_delay_real
4397          * or xfs_bmap_add_extent_hole_real might have merged it into one of
4398          * the neighbouring ones.
4399          */
4400         xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &bma->got);
4401
4402         ASSERT(bma->got.br_startoff <= bma->offset);
4403         ASSERT(bma->got.br_startoff + bma->got.br_blockcount >=
4404                bma->offset + bma->length);
4405         ASSERT(bma->got.br_state == XFS_EXT_NORM ||
4406                bma->got.br_state == XFS_EXT_UNWRITTEN);
4407         return 0;
4408 }
4409
4410 STATIC int
4411 xfs_bmapi_convert_unwritten(
4412         struct xfs_bmalloca     *bma,
4413         struct xfs_bmbt_irec    *mval,
4414         xfs_filblks_t           len,
4415         int                     flags)
4416 {
4417         int                     whichfork = xfs_bmapi_whichfork(flags);
4418         struct xfs_ifork        *ifp = XFS_IFORK_PTR(bma->ip, whichfork);
4419         int                     tmp_logflags = 0;
4420         int                     error;
4421
4422         /* check if we need to do unwritten->real conversion */
4423         if (mval->br_state == XFS_EXT_UNWRITTEN &&
4424             (flags & XFS_BMAPI_PREALLOC))
4425                 return 0;
4426
4427         /* check if we need to do real->unwritten conversion */
4428         if (mval->br_state == XFS_EXT_NORM &&
4429             (flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT)) !=
4430                         (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT))
4431                 return 0;
4432
4433         /*
4434          * Modify (by adding) the state flag, if writing.
4435          */
4436         ASSERT(mval->br_blockcount <= len);
4437         if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) {
4438                 bma->cur = xfs_bmbt_init_cursor(bma->ip->i_mount, bma->tp,
4439                                         bma->ip, whichfork);
4440                 bma->cur->bc_private.b.firstblock = *bma->firstblock;
4441                 bma->cur->bc_private.b.dfops = bma->dfops;
4442         }
4443         mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN)
4444                                 ? XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
4445
4446         /*
4447          * Before insertion into the bmbt, zero the range being converted
4448          * if required.
4449          */
4450         if (flags & XFS_BMAPI_ZERO) {
4451                 error = xfs_zero_extent(bma->ip, mval->br_startblock,
4452                                         mval->br_blockcount);
4453                 if (error)
4454                         return error;
4455         }
4456
4457         error = xfs_bmap_add_extent_unwritten_real(bma->tp, bma->ip, whichfork,
4458                         &bma->idx, &bma->cur, mval, bma->firstblock, bma->dfops,
4459                         &tmp_logflags);
4460         /*
4461          * Log the inode core unconditionally in the unwritten extent conversion
4462          * path because the conversion might not have done so (e.g., if the
4463          * extent count hasn't changed). We need to make sure the inode is dirty
4464          * in the transaction for the sake of fsync(), even if nothing has
4465          * changed, because fsync() will not force the log for this transaction
4466          * unless it sees the inode pinned.
4467          *
4468          * Note: If we're only converting cow fork extents, there aren't
4469          * any on-disk updates to make, so we don't need to log anything.
4470          */
4471         if (whichfork != XFS_COW_FORK)
4472                 bma->logflags |= tmp_logflags | XFS_ILOG_CORE;
4473         if (error)
4474                 return error;
4475
4476         /*
4477          * Update our extent pointer, given that
4478          * xfs_bmap_add_extent_unwritten_real might have merged it into one
4479          * of the neighbouring ones.
4480          */
4481         xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &bma->got);
4482
4483         /*
4484          * We may have combined previously unwritten space with written space,
4485          * so generate another request.
4486          */
4487         if (mval->br_blockcount < len)
4488                 return -EAGAIN;
4489         return 0;
4490 }
4491
4492 /*
4493  * Map file blocks to filesystem blocks, and allocate blocks or convert the
4494  * extent state if necessary.  Details behaviour is controlled by the flags
4495  * parameter.  Only allocates blocks from a single allocation group, to avoid
4496  * locking problems.
4497  *
4498  * The returned value in "firstblock" from the first call in a transaction
4499  * must be remembered and presented to subsequent calls in "firstblock".
4500  * An upper bound for the number of blocks to be allocated is supplied to
4501  * the first call in "total"; if no allocation group has that many free
4502  * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
4503  */
4504 int
4505 xfs_bmapi_write(
4506         struct xfs_trans        *tp,            /* transaction pointer */
4507         struct xfs_inode        *ip,            /* incore inode */
4508         xfs_fileoff_t           bno,            /* starting file offs. mapped */
4509         xfs_filblks_t           len,            /* length to map in file */
4510         int                     flags,          /* XFS_BMAPI_... */
4511         xfs_fsblock_t           *firstblock,    /* first allocated block
4512                                                    controls a.g. for allocs */
4513         xfs_extlen_t            total,          /* total blocks needed */
4514         struct xfs_bmbt_irec    *mval,          /* output: map values */
4515         int                     *nmap,          /* i/o: mval size/count */
4516         struct xfs_defer_ops    *dfops)         /* i/o: list extents to free */
4517 {
4518         struct xfs_mount        *mp = ip->i_mount;
4519         struct xfs_ifork        *ifp;
4520         struct xfs_bmalloca     bma = { NULL }; /* args for xfs_bmap_alloc */
4521         xfs_fileoff_t           end;            /* end of mapped file region */
4522         bool                    eof = false;    /* after the end of extents */
4523         int                     error;          /* error return */
4524         int                     n;              /* current extent index */
4525         xfs_fileoff_t           obno;           /* old block number (offset) */
4526         int                     whichfork;      /* data or attr fork */
4527
4528 #ifdef DEBUG
4529         xfs_fileoff_t           orig_bno;       /* original block number value */
4530         int                     orig_flags;     /* original flags arg value */
4531         xfs_filblks_t           orig_len;       /* original value of len arg */
4532         struct xfs_bmbt_irec    *orig_mval;     /* original value of mval */
4533         int                     orig_nmap;      /* original value of *nmap */
4534
4535         orig_bno = bno;
4536         orig_len = len;
4537         orig_flags = flags;
4538         orig_mval = mval;
4539         orig_nmap = *nmap;
4540 #endif
4541         whichfork = xfs_bmapi_whichfork(flags);
4542
4543         ASSERT(*nmap >= 1);
4544         ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
4545         ASSERT(!(flags & XFS_BMAPI_IGSTATE));
4546         ASSERT(tp != NULL ||
4547                (flags & (XFS_BMAPI_CONVERT | XFS_BMAPI_COWFORK)) ==
4548                         (XFS_BMAPI_CONVERT | XFS_BMAPI_COWFORK));
4549         ASSERT(len > 0);
4550         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL);
4551         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
4552         ASSERT(!(flags & XFS_BMAPI_REMAP) || whichfork == XFS_DATA_FORK);
4553         ASSERT(!(flags & XFS_BMAPI_PREALLOC) || !(flags & XFS_BMAPI_REMAP));
4554         ASSERT(!(flags & XFS_BMAPI_CONVERT) || !(flags & XFS_BMAPI_REMAP));
4555
4556         /* zeroing is for currently only for data extents, not metadata */
4557         ASSERT((flags & (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO)) !=
4558                         (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO));
4559         /*
4560          * we can allocate unwritten extents or pre-zero allocated blocks,
4561          * but it makes no sense to do both at once. This would result in
4562          * zeroing the unwritten extent twice, but it still being an
4563          * unwritten extent....
4564          */
4565         ASSERT((flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO)) !=
4566                         (XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO));
4567
4568         if (unlikely(XFS_TEST_ERROR(
4569             (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4570              XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
4571              mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4572                 XFS_ERROR_REPORT("xfs_bmapi_write", XFS_ERRLEVEL_LOW, mp);
4573                 return -EFSCORRUPTED;
4574         }
4575
4576         if (XFS_FORCED_SHUTDOWN(mp))
4577                 return -EIO;
4578
4579         ifp = XFS_IFORK_PTR(ip, whichfork);
4580
4581         XFS_STATS_INC(mp, xs_blk_mapw);
4582
4583         if (*firstblock == NULLFSBLOCK) {
4584                 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
4585                         bma.minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;
4586                 else
4587                         bma.minleft = 1;
4588         } else {
4589                 bma.minleft = 0;
4590         }
4591
4592         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
4593                 error = xfs_iread_extents(tp, ip, whichfork);
4594                 if (error)
4595                         goto error0;
4596         }
4597
4598         n = 0;
4599         end = bno + len;
4600         obno = bno;
4601
4602         if (!xfs_iext_lookup_extent(ip, ifp, bno, &bma.idx, &bma.got))
4603                 eof = true;
4604         if (!xfs_iext_get_extent(ifp, bma.idx - 1, &bma.prev))
4605                 bma.prev.br_startoff = NULLFILEOFF;
4606         bma.tp = tp;
4607         bma.ip = ip;
4608         bma.total = total;
4609         bma.datatype = 0;
4610         bma.dfops = dfops;
4611         bma.firstblock = firstblock;
4612
4613         while (bno < end && n < *nmap) {
4614                 bool                    need_alloc = false, wasdelay = false;
4615
4616                 /* in hole or beyoned EOF? */
4617                 if (eof || bma.got.br_startoff > bno) {
4618                         if (flags & XFS_BMAPI_DELALLOC) {
4619                                 /*
4620                                  * For the COW fork we can reasonably get a
4621                                  * request for converting an extent that races
4622                                  * with other threads already having converted
4623                                  * part of it, as there converting COW to
4624                                  * regular blocks is not protected using the
4625                                  * IOLOCK.
4626                                  */
4627                                 ASSERT(flags & XFS_BMAPI_COWFORK);
4628                                 if (!(flags & XFS_BMAPI_COWFORK)) {
4629                                         error = -EIO;
4630                                         goto error0;
4631                                 }
4632
4633                                 if (eof || bno >= end)
4634                                         break;
4635                         } else {
4636                                 need_alloc = true;
4637                         }
4638                 } else {
4639                         /*
4640                          * Make sure we only reflink into a hole.
4641                          */
4642                         ASSERT(!(flags & XFS_BMAPI_REMAP));
4643                         if (isnullstartblock(bma.got.br_startblock))
4644                                 wasdelay = true;
4645                 }
4646
4647                 /*
4648                  * First, deal with the hole before the allocated space
4649                  * that we found, if any.
4650                  */
4651                 if (need_alloc || wasdelay) {
4652                         bma.eof = eof;
4653                         bma.conv = !!(flags & XFS_BMAPI_CONVERT);
4654                         bma.wasdel = wasdelay;
4655                         bma.offset = bno;
4656                         bma.flags = flags;
4657
4658                         /*
4659                          * There's a 32/64 bit type mismatch between the
4660                          * allocation length request (which can be 64 bits in
4661                          * length) and the bma length request, which is
4662                          * xfs_extlen_t and therefore 32 bits. Hence we have to
4663                          * check for 32-bit overflows and handle them here.
4664                          */
4665                         if (len > (xfs_filblks_t)MAXEXTLEN)
4666                                 bma.length = MAXEXTLEN;
4667                         else
4668                                 bma.length = len;
4669
4670                         ASSERT(len > 0);
4671                         ASSERT(bma.length > 0);
4672                         error = xfs_bmapi_allocate(&bma);
4673                         if (error)
4674                                 goto error0;
4675                         if (bma.blkno == NULLFSBLOCK)
4676                                 break;
4677
4678                         /*
4679                          * If this is a CoW allocation, record the data in
4680                          * the refcount btree for orphan recovery.
4681                          */
4682                         if (whichfork == XFS_COW_FORK) {
4683                                 error = xfs_refcount_alloc_cow_extent(mp, dfops,
4684                                                 bma.blkno, bma.length);
4685                                 if (error)
4686                                         goto error0;
4687                         }
4688                 }
4689
4690                 /* Deal with the allocated space we found.  */
4691                 xfs_bmapi_trim_map(mval, &bma.got, &bno, len, obno,
4692                                                         end, n, flags);
4693
4694                 /* Execute unwritten extent conversion if necessary */
4695                 error = xfs_bmapi_convert_unwritten(&bma, mval, len, flags);
4696                 if (error == -EAGAIN)
4697                         continue;
4698                 if (error)
4699                         goto error0;
4700
4701                 /* update the extent map to return */
4702                 xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
4703
4704                 /*
4705                  * If we're done, stop now.  Stop when we've allocated
4706                  * XFS_BMAP_MAX_NMAP extents no matter what.  Otherwise
4707                  * the transaction may get too big.
4708                  */
4709                 if (bno >= end || n >= *nmap || bma.nallocs >= *nmap)
4710                         break;
4711
4712                 /* Else go on to the next record. */
4713                 bma.prev = bma.got;
4714                 if (!xfs_iext_get_extent(ifp, ++bma.idx, &bma.got))
4715                         eof = true;
4716         }
4717         *nmap = n;
4718
4719         /*
4720          * Transform from btree to extents, give it cur.
4721          */
4722         if (xfs_bmap_wants_extents(ip, whichfork)) {
4723                 int             tmp_logflags = 0;
4724
4725                 ASSERT(bma.cur);
4726                 error = xfs_bmap_btree_to_extents(tp, ip, bma.cur,
4727                         &tmp_logflags, whichfork);
4728                 bma.logflags |= tmp_logflags;
4729                 if (error)
4730                         goto error0;
4731         }
4732
4733         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
4734                XFS_IFORK_NEXTENTS(ip, whichfork) >
4735                 XFS_IFORK_MAXEXT(ip, whichfork));
4736         error = 0;
4737 error0:
4738         /*
4739          * Log everything.  Do this after conversion, there's no point in
4740          * logging the extent records if we've converted to btree format.
4741          */
4742         if ((bma.logflags & xfs_ilog_fext(whichfork)) &&
4743             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
4744                 bma.logflags &= ~xfs_ilog_fext(whichfork);
4745         else if ((bma.logflags & xfs_ilog_fbroot(whichfork)) &&
4746                  XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
4747                 bma.logflags &= ~xfs_ilog_fbroot(whichfork);
4748         /*
4749          * Log whatever the flags say, even if error.  Otherwise we might miss
4750          * detecting a case where the data is changed, there's an error,
4751          * and it's not logged so we don't shutdown when we should.
4752          */
4753         if (bma.logflags)
4754                 xfs_trans_log_inode(tp, ip, bma.logflags);
4755
4756         if (bma.cur) {
4757                 if (!error) {
4758                         ASSERT(*firstblock == NULLFSBLOCK ||
4759                                XFS_FSB_TO_AGNO(mp, *firstblock) <=
4760                                XFS_FSB_TO_AGNO(mp,
4761                                        bma.cur->bc_private.b.firstblock));
4762                         *firstblock = bma.cur->bc_private.b.firstblock;
4763                 }
4764                 xfs_btree_del_cursor(bma.cur,
4765                         error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
4766         }
4767         if (!error)
4768                 xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
4769                         orig_nmap, *nmap);
4770         return error;
4771 }
4772
4773 /*
4774  * When a delalloc extent is split (e.g., due to a hole punch), the original
4775  * indlen reservation must be shared across the two new extents that are left
4776  * behind.
4777  *
4778  * Given the original reservation and the worst case indlen for the two new
4779  * extents (as calculated by xfs_bmap_worst_indlen()), split the original
4780  * reservation fairly across the two new extents. If necessary, steal available
4781  * blocks from a deleted extent to make up a reservation deficiency (e.g., if
4782  * ores == 1). The number of stolen blocks is returned. The availability and
4783  * subsequent accounting of stolen blocks is the responsibility of the caller.
4784  */
4785 static xfs_filblks_t
4786 xfs_bmap_split_indlen(
4787         xfs_filblks_t                   ores,           /* original res. */
4788         xfs_filblks_t                   *indlen1,       /* ext1 worst indlen */
4789         xfs_filblks_t                   *indlen2,       /* ext2 worst indlen */
4790         xfs_filblks_t                   avail)          /* stealable blocks */
4791 {
4792         xfs_filblks_t                   len1 = *indlen1;
4793         xfs_filblks_t                   len2 = *indlen2;
4794         xfs_filblks_t                   nres = len1 + len2; /* new total res. */
4795         xfs_filblks_t                   stolen = 0;
4796         xfs_filblks_t                   resfactor;
4797
4798         /*
4799          * Steal as many blocks as we can to try and satisfy the worst case
4800          * indlen for both new extents.
4801          */
4802         if (ores < nres && avail)
4803                 stolen = XFS_FILBLKS_MIN(nres - ores, avail);
4804         ores += stolen;
4805
4806          /* nothing else to do if we've satisfied the new reservation */
4807         if (ores >= nres)
4808                 return stolen;
4809
4810         /*
4811          * We can't meet the total required reservation for the two extents.
4812          * Calculate the percent of the overall shortage between both extents
4813          * and apply this percentage to each of the requested indlen values.
4814          * This distributes the shortage fairly and reduces the chances that one
4815          * of the two extents is left with nothing when extents are repeatedly
4816          * split.
4817          */
4818         resfactor = (ores * 100);
4819         do_div(resfactor, nres);
4820         len1 *= resfactor;
4821         do_div(len1, 100);
4822         len2 *= resfactor;
4823         do_div(len2, 100);
4824         ASSERT(len1 + len2 <= ores);
4825         ASSERT(len1 < *indlen1 && len2 < *indlen2);
4826
4827         /*
4828          * Hand out the remainder to each extent. If one of the two reservations
4829          * is zero, we want to make sure that one gets a block first. The loop
4830          * below starts with len1, so hand len2 a block right off the bat if it
4831          * is zero.
4832          */
4833         ores -= (len1 + len2);
4834         ASSERT((*indlen1 - len1) + (*indlen2 - len2) >= ores);
4835         if (ores && !len2 && *indlen2) {
4836                 len2++;
4837                 ores--;
4838         }
4839         while (ores) {
4840                 if (len1 < *indlen1) {
4841                         len1++;
4842                         ores--;
4843                 }
4844                 if (!ores)
4845                         break;
4846                 if (len2 < *indlen2) {
4847                         len2++;
4848                         ores--;
4849                 }
4850         }
4851
4852         *indlen1 = len1;
4853         *indlen2 = len2;
4854
4855         return stolen;
4856 }
4857
4858 int
4859 xfs_bmap_del_extent_delay(
4860         struct xfs_inode        *ip,
4861         int                     whichfork,
4862         xfs_extnum_t            *idx,
4863         struct xfs_bmbt_irec    *got,
4864         struct xfs_bmbt_irec    *del)
4865 {
4866         struct xfs_mount        *mp = ip->i_mount;
4867         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
4868         struct xfs_bmbt_irec    new;
4869         int64_t                 da_old, da_new, da_diff = 0;
4870         xfs_fileoff_t           del_endoff, got_endoff;
4871         xfs_filblks_t           got_indlen, new_indlen, stolen;
4872         int                     error = 0, state = 0;
4873         bool                    isrt;
4874
4875         XFS_STATS_INC(mp, xs_del_exlist);
4876
4877         isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
4878         del_endoff = del->br_startoff + del->br_blockcount;
4879         got_endoff = got->br_startoff + got->br_blockcount;
4880         da_old = startblockval(got->br_startblock);
4881         da_new = 0;
4882
4883         ASSERT(*idx >= 0);
4884         ASSERT(*idx <= xfs_iext_count(ifp));
4885         ASSERT(del->br_blockcount > 0);
4886         ASSERT(got->br_startoff <= del->br_startoff);
4887         ASSERT(got_endoff >= del_endoff);
4888
4889         if (isrt) {
4890                 int64_t rtexts = XFS_FSB_TO_B(mp, del->br_blockcount);
4891
4892                 do_div(rtexts, mp->m_sb.sb_rextsize);
4893                 xfs_mod_frextents(mp, rtexts);
4894         }
4895
4896         /*
4897          * Update the inode delalloc counter now and wait to update the
4898          * sb counters as we might have to borrow some blocks for the
4899          * indirect block accounting.
4900          */
4901         error = xfs_trans_reserve_quota_nblks(NULL, ip,
4902                         -((long)del->br_blockcount), 0,
4903                         isrt ? XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
4904         if (error)
4905                 return error;
4906         ip->i_delayed_blks -= del->br_blockcount;
4907
4908         if (whichfork == XFS_COW_FORK)
4909                 state |= BMAP_COWFORK;
4910
4911         if (got->br_startoff == del->br_startoff)
4912                 state |= BMAP_LEFT_CONTIG;
4913         if (got_endoff == del_endoff)
4914                 state |= BMAP_RIGHT_CONTIG;
4915
4916         switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
4917         case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
4918                 /*
4919                  * Matches the whole extent.  Delete the entry.
4920                  */
4921                 xfs_iext_remove(ip, *idx, 1, state);
4922                 --*idx;
4923                 break;
4924         case BMAP_LEFT_CONTIG:
4925                 /*
4926                  * Deleting the first part of the extent.
4927                  */
4928                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
4929                 got->br_startoff = del_endoff;
4930                 got->br_blockcount -= del->br_blockcount;
4931                 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip,
4932                                 got->br_blockcount), da_old);
4933                 got->br_startblock = nullstartblock((int)da_new);
4934                 xfs_bmbt_set_all(xfs_iext_get_ext(ifp, *idx), got);
4935                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
4936                 break;
4937         case BMAP_RIGHT_CONTIG:
4938                 /*
4939                  * Deleting the last part of the extent.
4940                  */
4941                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
4942                 got->br_blockcount = got->br_blockcount - del->br_blockcount;
4943                 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip,
4944                                 got->br_blockcount), da_old);
4945                 got->br_startblock = nullstartblock((int)da_new);
4946                 xfs_bmbt_set_all(xfs_iext_get_ext(ifp, *idx), got);
4947                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
4948                 break;
4949         case 0:
4950                 /*
4951                  * Deleting the middle of the extent.
4952                  *
4953                  * Distribute the original indlen reservation across the two new
4954                  * extents.  Steal blocks from the deleted extent if necessary.
4955                  * Stealing blocks simply fudges the fdblocks accounting below.
4956                  * Warn if either of the new indlen reservations is zero as this
4957                  * can lead to delalloc problems.
4958                  */
4959                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
4960
4961                 got->br_blockcount = del->br_startoff - got->br_startoff;
4962                 got_indlen = xfs_bmap_worst_indlen(ip, got->br_blockcount);
4963
4964                 new.br_blockcount = got_endoff - del_endoff;
4965                 new_indlen = xfs_bmap_worst_indlen(ip, new.br_blockcount);
4966
4967                 WARN_ON_ONCE(!got_indlen || !new_indlen);
4968                 stolen = xfs_bmap_split_indlen(da_old, &got_indlen, &new_indlen,
4969                                                        del->br_blockcount);
4970
4971                 got->br_startblock = nullstartblock((int)got_indlen);
4972                 xfs_bmbt_set_all(xfs_iext_get_ext(ifp, *idx), got);
4973                 trace_xfs_bmap_post_update(ip, *idx, 0, _THIS_IP_);
4974
4975                 new.br_startoff = del_endoff;
4976                 new.br_state = got->br_state;
4977                 new.br_startblock = nullstartblock((int)new_indlen);
4978
4979                 ++*idx;
4980                 xfs_iext_insert(ip, *idx, 1, &new, state);
4981
4982                 da_new = got_indlen + new_indlen - stolen;
4983                 del->br_blockcount -= stolen;
4984                 break;
4985         }
4986
4987         ASSERT(da_old >= da_new);
4988         da_diff = da_old - da_new;
4989         if (!isrt)
4990                 da_diff += del->br_blockcount;
4991         if (da_diff)
4992                 xfs_mod_fdblocks(mp, da_diff, false);
4993         return error;
4994 }
4995
4996 void
4997 xfs_bmap_del_extent_cow(
4998         struct xfs_inode        *ip,
4999         xfs_extnum_t            *idx,
5000         struct xfs_bmbt_irec    *got,
5001         struct xfs_bmbt_irec    *del)
5002 {
5003         struct xfs_mount        *mp = ip->i_mount;
5004         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
5005         struct xfs_bmbt_irec    new;
5006         xfs_fileoff_t           del_endoff, got_endoff;
5007         int                     state = BMAP_COWFORK;
5008
5009         XFS_STATS_INC(mp, xs_del_exlist);
5010
5011         del_endoff = del->br_startoff + del->br_blockcount;
5012         got_endoff = got->br_startoff + got->br_blockcount;
5013
5014         ASSERT(*idx >= 0);
5015         ASSERT(*idx <= xfs_iext_count(ifp));
5016         ASSERT(del->br_blockcount > 0);
5017         ASSERT(got->br_startoff <= del->br_startoff);
5018         ASSERT(got_endoff >= del_endoff);
5019         ASSERT(!isnullstartblock(got->br_startblock));
5020
5021         if (got->br_startoff == del->br_startoff)
5022                 state |= BMAP_LEFT_CONTIG;
5023         if (got_endoff == del_endoff)
5024                 state |= BMAP_RIGHT_CONTIG;
5025
5026         switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
5027         case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
5028                 /*
5029                  * Matches the whole extent.  Delete the entry.
5030                  */
5031                 xfs_iext_remove(ip, *idx, 1, state);
5032                 --*idx;
5033                 break;
5034         case BMAP_LEFT_CONTIG:
5035                 /*
5036                  * Deleting the first part of the extent.
5037                  */
5038                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
5039                 got->br_startoff = del_endoff;
5040                 got->br_blockcount -= del->br_blockcount;
5041                 got->br_startblock = del->br_startblock + del->br_blockcount;
5042                 xfs_bmbt_set_all(xfs_iext_get_ext(ifp, *idx), got);
5043                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
5044                 break;
5045         case BMAP_RIGHT_CONTIG:
5046                 /*
5047                  * Deleting the last part of the extent.
5048                  */
5049                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
5050                 got->br_blockcount -= del->br_blockcount;
5051                 xfs_bmbt_set_all(xfs_iext_get_ext(ifp, *idx), got);
5052                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
5053                 break;
5054         case 0:
5055                 /*
5056                  * Deleting the middle of the extent.
5057                  */
5058                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
5059                 got->br_blockcount = del->br_startoff - got->br_startoff;
5060                 xfs_bmbt_set_all(xfs_iext_get_ext(ifp, *idx), got);
5061                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
5062
5063                 new.br_startoff = del_endoff;
5064                 new.br_blockcount = got_endoff - del_endoff;
5065                 new.br_state = got->br_state;
5066                 new.br_startblock = del->br_startblock + del->br_blockcount;
5067
5068                 ++*idx;
5069                 xfs_iext_insert(ip, *idx, 1, &new, state);
5070                 break;
5071         }
5072 }
5073
5074 /*
5075  * Called by xfs_bmapi to update file extent records and the btree
5076  * after removing space (or undoing a delayed allocation).
5077  */
5078 STATIC int                              /* error */
5079 xfs_bmap_del_extent(
5080         xfs_inode_t             *ip,    /* incore inode pointer */
5081         xfs_trans_t             *tp,    /* current transaction pointer */
5082         xfs_extnum_t            *idx,   /* extent number to update/delete */
5083         struct xfs_defer_ops    *dfops, /* list of extents to be freed */
5084         xfs_btree_cur_t         *cur,   /* if null, not a btree */
5085         xfs_bmbt_irec_t         *del,   /* data to remove from extents */
5086         int                     *logflagsp, /* inode logging flags */
5087         int                     whichfork, /* data or attr fork */
5088         int                     bflags) /* bmapi flags */
5089 {
5090         xfs_filblks_t           da_new; /* new delay-alloc indirect blocks */
5091         xfs_filblks_t           da_old; /* old delay-alloc indirect blocks */
5092         xfs_fsblock_t           del_endblock=0; /* first block past del */
5093         xfs_fileoff_t           del_endoff;     /* first offset past del */
5094         int                     delay;  /* current block is delayed allocated */
5095         int                     do_fx;  /* free extent at end of routine */
5096         xfs_bmbt_rec_host_t     *ep;    /* current extent entry pointer */
5097         int                     error;  /* error return value */
5098         int                     flags;  /* inode logging flags */
5099         xfs_bmbt_irec_t         got;    /* current extent entry */
5100         xfs_fileoff_t           got_endoff;     /* first offset past got */
5101         int                     i;      /* temp state */
5102         xfs_ifork_t             *ifp;   /* inode fork pointer */
5103         xfs_mount_t             *mp;    /* mount structure */
5104         xfs_filblks_t           nblks;  /* quota/sb block count */
5105         xfs_bmbt_irec_t         new;    /* new record to be inserted */
5106         /* REFERENCED */
5107         uint                    qfield; /* quota field to update */
5108         xfs_filblks_t           temp;   /* for indirect length calculations */
5109         xfs_filblks_t           temp2;  /* for indirect length calculations */
5110         int                     state = 0;
5111
5112         mp = ip->i_mount;
5113         XFS_STATS_INC(mp, xs_del_exlist);
5114
5115         if (whichfork == XFS_ATTR_FORK)
5116                 state |= BMAP_ATTRFORK;
5117         else if (whichfork == XFS_COW_FORK)
5118                 state |= BMAP_COWFORK;
5119
5120         ifp = XFS_IFORK_PTR(ip, whichfork);
5121         ASSERT((*idx >= 0) && (*idx < xfs_iext_count(ifp)));
5122         ASSERT(del->br_blockcount > 0);
5123         ep = xfs_iext_get_ext(ifp, *idx);
5124         xfs_bmbt_get_all(ep, &got);
5125         ASSERT(got.br_startoff <= del->br_startoff);
5126         del_endoff = del->br_startoff + del->br_blockcount;
5127         got_endoff = got.br_startoff + got.br_blockcount;
5128         ASSERT(got_endoff >= del_endoff);
5129         delay = isnullstartblock(got.br_startblock);
5130         ASSERT(isnullstartblock(del->br_startblock) == delay);
5131         flags = 0;
5132         qfield = 0;
5133         error = 0;
5134         /*
5135          * If deleting a real allocation, must free up the disk space.
5136          */
5137         if (!delay) {
5138                 flags = XFS_ILOG_CORE;
5139                 /*
5140                  * Realtime allocation.  Free it and record di_nblocks update.
5141                  */
5142                 if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
5143                         xfs_fsblock_t   bno;
5144                         xfs_filblks_t   len;
5145
5146                         ASSERT(do_mod(del->br_blockcount,
5147                                       mp->m_sb.sb_rextsize) == 0);
5148                         ASSERT(do_mod(del->br_startblock,
5149                                       mp->m_sb.sb_rextsize) == 0);
5150                         bno = del->br_startblock;
5151                         len = del->br_blockcount;
5152                         do_div(bno, mp->m_sb.sb_rextsize);
5153                         do_div(len, mp->m_sb.sb_rextsize);
5154                         error = xfs_rtfree_extent(tp, bno, (xfs_extlen_t)len);
5155                         if (error)
5156                                 goto done;
5157                         do_fx = 0;
5158                         nblks = len * mp->m_sb.sb_rextsize;
5159                         qfield = XFS_TRANS_DQ_RTBCOUNT;
5160                 }
5161                 /*
5162                  * Ordinary allocation.
5163                  */
5164                 else {
5165                         do_fx = 1;
5166                         nblks = del->br_blockcount;
5167                         qfield = XFS_TRANS_DQ_BCOUNT;
5168                 }
5169                 /*
5170                  * Set up del_endblock and cur for later.
5171                  */
5172                 del_endblock = del->br_startblock + del->br_blockcount;
5173                 if (cur) {
5174                         if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
5175                                         got.br_startblock, got.br_blockcount,
5176                                         &i)))
5177                                 goto done;
5178                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
5179                 }
5180                 da_old = da_new = 0;
5181         } else {
5182                 da_old = startblockval(got.br_startblock);
5183                 da_new = 0;
5184                 nblks = 0;
5185                 do_fx = 0;
5186         }
5187
5188         /*
5189          * Set flag value to use in switch statement.
5190          * Left-contig is 2, right-contig is 1.
5191          */
5192         switch (((got.br_startoff == del->br_startoff) << 1) |
5193                 (got_endoff == del_endoff)) {
5194         case 3:
5195                 /*
5196                  * Matches the whole extent.  Delete the entry.
5197                  */
5198                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
5199                 xfs_iext_remove(ip, *idx, 1,
5200                                 whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0);
5201                 --*idx;
5202                 if (delay)
5203                         break;
5204
5205                 XFS_IFORK_NEXT_SET(ip, whichfork,
5206                         XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
5207                 flags |= XFS_ILOG_CORE;
5208                 if (!cur) {
5209                         flags |= xfs_ilog_fext(whichfork);
5210                         break;
5211                 }
5212                 if ((error = xfs_btree_delete(cur, &i)))
5213                         goto done;
5214                 XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
5215                 break;
5216
5217         case 2:
5218                 /*
5219                  * Deleting the first part of the extent.
5220                  */
5221                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
5222                 xfs_bmbt_set_startoff(ep, del_endoff);
5223                 temp = got.br_blockcount - del->br_blockcount;
5224                 xfs_bmbt_set_blockcount(ep, temp);
5225                 if (delay) {
5226                         temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
5227                                 da_old);
5228                         xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
5229                         trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
5230                         da_new = temp;
5231                         break;
5232                 }
5233                 xfs_bmbt_set_startblock(ep, del_endblock);
5234                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
5235                 if (!cur) {
5236                         flags |= xfs_ilog_fext(whichfork);
5237                         break;
5238                 }
5239                 if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
5240                                 got.br_blockcount - del->br_blockcount,
5241                                 got.br_state)))
5242                         goto done;
5243                 break;
5244
5245         case 1:
5246                 /*
5247                  * Deleting the last part of the extent.
5248                  */
5249                 temp = got.br_blockcount - del->br_blockcount;
5250                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
5251                 xfs_bmbt_set_blockcount(ep, temp);
5252                 if (delay) {
5253                         temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
5254                                 da_old);
5255                         xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
5256                         trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
5257                         da_new = temp;
5258                         break;
5259                 }
5260                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
5261                 if (!cur) {
5262                         flags |= xfs_ilog_fext(whichfork);
5263                         break;
5264                 }
5265                 if ((error = xfs_bmbt_update(cur, got.br_startoff,
5266                                 got.br_startblock,
5267                                 got.br_blockcount - del->br_blockcount,
5268                                 got.br_state)))
5269                         goto done;
5270                 break;
5271
5272         case 0:
5273                 /*
5274                  * Deleting the middle of the extent.
5275                  */
5276                 temp = del->br_startoff - got.br_startoff;
5277                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
5278                 xfs_bmbt_set_blockcount(ep, temp);
5279                 new.br_startoff = del_endoff;
5280                 temp2 = got_endoff - del_endoff;
5281                 new.br_blockcount = temp2;
5282                 new.br_state = got.br_state;
5283                 if (!delay) {
5284                         new.br_startblock = del_endblock;
5285                         flags |= XFS_ILOG_CORE;
5286                         if (cur) {
5287                                 if ((error = xfs_bmbt_update(cur,
5288                                                 got.br_startoff,
5289                                                 got.br_startblock, temp,
5290                                                 got.br_state)))
5291                                         goto done;
5292                                 if ((error = xfs_btree_increment(cur, 0, &i)))
5293                                         goto done;
5294                                 cur->bc_rec.b = new;
5295                                 error = xfs_btree_insert(cur, &i);
5296                                 if (error && error != -ENOSPC)
5297                                         goto done;
5298                                 /*
5299                                  * If get no-space back from btree insert,
5300                                  * it tried a split, and we have a zero
5301                                  * block reservation.
5302                                  * Fix up our state and return the error.
5303                                  */
5304                                 if (error == -ENOSPC) {
5305                                         /*
5306                                          * Reset the cursor, don't trust
5307                                          * it after any insert operation.
5308                                          */
5309                                         if ((error = xfs_bmbt_lookup_eq(cur,
5310                                                         got.br_startoff,
5311                                                         got.br_startblock,
5312                                                         temp, &i)))
5313                                                 goto done;
5314                                         XFS_WANT_CORRUPTED_GOTO(mp,
5315                                                                 i == 1, done);
5316                                         /*
5317                                          * Update the btree record back
5318                                          * to the original value.
5319                                          */
5320                                         if ((error = xfs_bmbt_update(cur,
5321                                                         got.br_startoff,
5322                                                         got.br_startblock,
5323                                                         got.br_blockcount,
5324                                                         got.br_state)))
5325                                                 goto done;
5326                                         /*
5327                                          * Reset the extent record back
5328                                          * to the original value.
5329                                          */
5330                                         xfs_bmbt_set_blockcount(ep,
5331                                                 got.br_blockcount);
5332                                         flags = 0;
5333                                         error = -ENOSPC;
5334                                         goto done;
5335                                 }
5336                                 XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
5337                         } else
5338                                 flags |= xfs_ilog_fext(whichfork);
5339                         XFS_IFORK_NEXT_SET(ip, whichfork,
5340                                 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
5341                 } else {
5342                         xfs_filblks_t   stolen;
5343                         ASSERT(whichfork == XFS_DATA_FORK);
5344
5345                         /*
5346                          * Distribute the original indlen reservation across the
5347                          * two new extents. Steal blocks from the deleted extent
5348                          * if necessary. Stealing blocks simply fudges the
5349                          * fdblocks accounting in xfs_bunmapi().
5350                          */
5351                         temp = xfs_bmap_worst_indlen(ip, got.br_blockcount);
5352                         temp2 = xfs_bmap_worst_indlen(ip, new.br_blockcount);
5353                         stolen = xfs_bmap_split_indlen(da_old, &temp, &temp2,
5354                                                        del->br_blockcount);
5355                         da_new = temp + temp2 - stolen;
5356                         del->br_blockcount -= stolen;
5357
5358                         /*
5359                          * Set the reservation for each extent. Warn if either
5360                          * is zero as this can lead to delalloc problems.
5361                          */
5362                         WARN_ON_ONCE(!temp || !temp2);
5363                         xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
5364                         new.br_startblock = nullstartblock((int)temp2);
5365                 }
5366                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
5367                 xfs_iext_insert(ip, *idx + 1, 1, &new, state);
5368                 ++*idx;
5369                 break;
5370         }
5371
5372         /* remove reverse mapping */
5373         if (!delay) {
5374                 error = xfs_rmap_unmap_extent(mp, dfops, ip, whichfork, del);
5375                 if (error)
5376                         goto done;
5377         }
5378
5379         /*
5380          * If we need to, add to list of extents to delete.
5381          */
5382         if (do_fx && !(bflags & XFS_BMAPI_REMAP)) {
5383                 if (xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK) {
5384                         error = xfs_refcount_decrease_extent(mp, dfops, del);
5385                         if (error)
5386                                 goto done;
5387                 } else
5388                         xfs_bmap_add_free(mp, dfops, del->br_startblock,
5389                                         del->br_blockcount, NULL);
5390         }
5391
5392         /*
5393          * Adjust inode # blocks in the file.
5394          */
5395         if (nblks)
5396                 ip->i_d.di_nblocks -= nblks;
5397         /*
5398          * Adjust quota data.
5399          */
5400         if (qfield && !(bflags & XFS_BMAPI_REMAP))
5401                 xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks);
5402
5403         /*
5404          * Account for change in delayed indirect blocks.
5405          * Nothing to do for disk quota accounting here.
5406          */
5407         ASSERT(da_old >= da_new);
5408         if (da_old > da_new)
5409                 xfs_mod_fdblocks(mp, (int64_t)(da_old - da_new), false);
5410 done:
5411         *logflagsp = flags;
5412         return error;
5413 }
5414
5415 /*
5416  * Unmap (remove) blocks from a file.
5417  * If nexts is nonzero then the number of extents to remove is limited to
5418  * that value.  If not all extents in the block range can be removed then
5419  * *done is set.
5420  */
5421 int                                             /* error */
5422 __xfs_bunmapi(
5423         xfs_trans_t             *tp,            /* transaction pointer */
5424         struct xfs_inode        *ip,            /* incore inode */
5425         xfs_fileoff_t           bno,            /* starting offset to unmap */
5426         xfs_filblks_t           *rlen,          /* i/o: amount remaining */
5427         int                     flags,          /* misc flags */
5428         xfs_extnum_t            nexts,          /* number of extents max */
5429         xfs_fsblock_t           *firstblock,    /* first allocated block
5430                                                    controls a.g. for allocs */
5431         struct xfs_defer_ops    *dfops)         /* i/o: deferred updates */
5432 {
5433         xfs_btree_cur_t         *cur;           /* bmap btree cursor */
5434         xfs_bmbt_irec_t         del;            /* extent being deleted */
5435         int                     error;          /* error return value */
5436         xfs_extnum_t            extno;          /* extent number in list */
5437         xfs_bmbt_irec_t         got;            /* current extent record */
5438         xfs_ifork_t             *ifp;           /* inode fork pointer */
5439         int                     isrt;           /* freeing in rt area */
5440         xfs_extnum_t            lastx;          /* last extent index used */
5441         int                     logflags;       /* transaction logging flags */
5442         xfs_extlen_t            mod;            /* rt extent offset */
5443         xfs_mount_t             *mp;            /* mount structure */
5444         xfs_fileoff_t           start;          /* first file offset deleted */
5445         int                     tmp_logflags;   /* partial logging flags */
5446         int                     wasdel;         /* was a delayed alloc extent */
5447         int                     whichfork;      /* data or attribute fork */
5448         xfs_fsblock_t           sum;
5449         xfs_filblks_t           len = *rlen;    /* length to unmap in file */
5450
5451         trace_xfs_bunmap(ip, bno, len, flags, _RET_IP_);
5452
5453         whichfork = xfs_bmapi_whichfork(flags);
5454         ASSERT(whichfork != XFS_COW_FORK);
5455         ifp = XFS_IFORK_PTR(ip, whichfork);
5456         if (unlikely(
5457             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
5458             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
5459                 XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
5460                                  ip->i_mount);
5461                 return -EFSCORRUPTED;
5462         }
5463         mp = ip->i_mount;
5464         if (XFS_FORCED_SHUTDOWN(mp))
5465                 return -EIO;
5466
5467         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
5468         ASSERT(len > 0);
5469         ASSERT(nexts >= 0);
5470
5471         if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5472             (error = xfs_iread_extents(tp, ip, whichfork)))
5473                 return error;
5474         if (xfs_iext_count(ifp) == 0) {
5475                 *rlen = 0;
5476                 return 0;
5477         }
5478         XFS_STATS_INC(mp, xs_blk_unmap);
5479         isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
5480         start = bno;
5481         bno = start + len - 1;
5482
5483         /*
5484          * Check to see if the given block number is past the end of the
5485          * file, back up to the last block if so...
5486          */
5487         if (!xfs_iext_lookup_extent(ip, ifp, bno, &lastx, &got)) {
5488                 ASSERT(lastx > 0);
5489                 xfs_iext_get_extent(ifp, --lastx, &got);
5490                 bno = got.br_startoff + got.br_blockcount - 1;
5491         }
5492
5493         logflags = 0;
5494         if (ifp->if_flags & XFS_IFBROOT) {
5495                 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
5496                 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
5497                 cur->bc_private.b.firstblock = *firstblock;
5498                 cur->bc_private.b.dfops = dfops;
5499                 cur->bc_private.b.flags = 0;
5500         } else
5501                 cur = NULL;
5502
5503         if (isrt) {
5504                 /*
5505                  * Synchronize by locking the bitmap inode.
5506                  */
5507                 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL|XFS_ILOCK_RTBITMAP);
5508                 xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
5509                 xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL|XFS_ILOCK_RTSUM);
5510                 xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL);
5511         }
5512
5513         extno = 0;
5514         while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
5515                (nexts == 0 || extno < nexts)) {
5516                 /*
5517                  * Is the found extent after a hole in which bno lives?
5518                  * Just back up to the previous extent, if so.
5519                  */
5520                 if (got.br_startoff > bno) {
5521                         if (--lastx < 0)
5522                                 break;
5523                         xfs_iext_get_extent(ifp, lastx, &got);
5524                 }
5525                 /*
5526                  * Is the last block of this extent before the range
5527                  * we're supposed to delete?  If so, we're done.
5528                  */
5529                 bno = XFS_FILEOFF_MIN(bno,
5530                         got.br_startoff + got.br_blockcount - 1);
5531                 if (bno < start)
5532                         break;
5533                 /*
5534                  * Then deal with the (possibly delayed) allocated space
5535                  * we found.
5536                  */
5537                 del = got;
5538                 wasdel = isnullstartblock(del.br_startblock);
5539                 if (got.br_startoff < start) {
5540                         del.br_startoff = start;
5541                         del.br_blockcount -= start - got.br_startoff;
5542                         if (!wasdel)
5543                                 del.br_startblock += start - got.br_startoff;
5544                 }
5545                 if (del.br_startoff + del.br_blockcount > bno + 1)
5546                         del.br_blockcount = bno + 1 - del.br_startoff;
5547                 sum = del.br_startblock + del.br_blockcount;
5548                 if (isrt &&
5549                     (mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
5550                         /*
5551                          * Realtime extent not lined up at the end.
5552                          * The extent could have been split into written
5553                          * and unwritten pieces, or we could just be
5554                          * unmapping part of it.  But we can't really
5555                          * get rid of part of a realtime extent.
5556                          */
5557                         if (del.br_state == XFS_EXT_UNWRITTEN ||
5558                             !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5559                                 /*
5560                                  * This piece is unwritten, or we're not
5561                                  * using unwritten extents.  Skip over it.
5562                                  */
5563                                 ASSERT(bno >= mod);
5564                                 bno -= mod > del.br_blockcount ?
5565                                         del.br_blockcount : mod;
5566                                 if (bno < got.br_startoff) {
5567                                         if (--lastx >= 0)
5568                                                 xfs_bmbt_get_all(xfs_iext_get_ext(
5569                                                         ifp, lastx), &got);
5570                                 }
5571                                 continue;
5572                         }
5573                         /*
5574                          * It's written, turn it unwritten.
5575                          * This is better than zeroing it.
5576                          */
5577                         ASSERT(del.br_state == XFS_EXT_NORM);
5578                         ASSERT(tp->t_blk_res > 0);
5579                         /*
5580                          * If this spans a realtime extent boundary,
5581                          * chop it back to the start of the one we end at.
5582                          */
5583                         if (del.br_blockcount > mod) {
5584                                 del.br_startoff += del.br_blockcount - mod;
5585                                 del.br_startblock += del.br_blockcount - mod;
5586                                 del.br_blockcount = mod;
5587                         }
5588                         del.br_state = XFS_EXT_UNWRITTEN;
5589                         error = xfs_bmap_add_extent_unwritten_real(tp, ip,
5590                                         whichfork, &lastx, &cur, &del,
5591                                         firstblock, dfops, &logflags);
5592                         if (error)
5593                                 goto error0;
5594                         goto nodelete;
5595                 }
5596                 if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
5597                         /*
5598                          * Realtime extent is lined up at the end but not
5599                          * at the front.  We'll get rid of full extents if
5600                          * we can.
5601                          */
5602                         mod = mp->m_sb.sb_rextsize - mod;
5603                         if (del.br_blockcount > mod) {
5604                                 del.br_blockcount -= mod;
5605                                 del.br_startoff += mod;
5606                                 del.br_startblock += mod;
5607                         } else if ((del.br_startoff == start &&
5608                                     (del.br_state == XFS_EXT_UNWRITTEN ||
5609                                      tp->t_blk_res == 0)) ||
5610                                    !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5611                                 /*
5612                                  * Can't make it unwritten.  There isn't
5613                                  * a full extent here so just skip it.
5614                                  */
5615                                 ASSERT(bno >= del.br_blockcount);
5616                                 bno -= del.br_blockcount;
5617                                 if (got.br_startoff > bno && --lastx >= 0)
5618                                         xfs_iext_get_extent(ifp, lastx, &got);
5619                                 continue;
5620                         } else if (del.br_state == XFS_EXT_UNWRITTEN) {
5621                                 struct xfs_bmbt_irec    prev;
5622
5623                                 /*
5624                                  * This one is already unwritten.
5625                                  * It must have a written left neighbor.
5626                                  * Unwrite the killed part of that one and
5627                                  * try again.
5628                                  */
5629                                 ASSERT(lastx > 0);
5630                                 xfs_iext_get_extent(ifp, lastx - 1, &prev);
5631                                 ASSERT(prev.br_state == XFS_EXT_NORM);
5632                                 ASSERT(!isnullstartblock(prev.br_startblock));
5633                                 ASSERT(del.br_startblock ==
5634                                        prev.br_startblock + prev.br_blockcount);
5635                                 if (prev.br_startoff < start) {
5636                                         mod = start - prev.br_startoff;
5637                                         prev.br_blockcount -= mod;
5638                                         prev.br_startblock += mod;
5639                                         prev.br_startoff = start;
5640                                 }
5641                                 prev.br_state = XFS_EXT_UNWRITTEN;
5642                                 lastx--;
5643                                 error = xfs_bmap_add_extent_unwritten_real(tp,
5644                                                 ip, whichfork, &lastx, &cur,
5645                                                 &prev, firstblock, dfops,
5646                                                 &logflags);
5647                                 if (error)
5648                                         goto error0;
5649                                 goto nodelete;
5650                         } else {
5651                                 ASSERT(del.br_state == XFS_EXT_NORM);
5652                                 del.br_state = XFS_EXT_UNWRITTEN;
5653                                 error = xfs_bmap_add_extent_unwritten_real(tp,
5654                                                 ip, whichfork, &lastx, &cur,
5655                                                 &del, firstblock, dfops,
5656                                                 &logflags);
5657                                 if (error)
5658                                         goto error0;
5659                                 goto nodelete;
5660                         }
5661                 }
5662
5663                 /*
5664                  * If it's the case where the directory code is running
5665                  * with no block reservation, and the deleted block is in
5666                  * the middle of its extent, and the resulting insert
5667                  * of an extent would cause transformation to btree format,
5668                  * then reject it.  The calling code will then swap
5669                  * blocks around instead.
5670                  * We have to do this now, rather than waiting for the
5671                  * conversion to btree format, since the transaction
5672                  * will be dirty.
5673                  */
5674                 if (!wasdel && tp->t_blk_res == 0 &&
5675                     XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5676                     XFS_IFORK_NEXTENTS(ip, whichfork) >= /* Note the >= */
5677                         XFS_IFORK_MAXEXT(ip, whichfork) &&
5678                     del.br_startoff > got.br_startoff &&
5679                     del.br_startoff + del.br_blockcount <
5680                     got.br_startoff + got.br_blockcount) {
5681                         error = -ENOSPC;
5682                         goto error0;
5683                 }
5684
5685                 /*
5686                  * Unreserve quota and update realtime free space, if
5687                  * appropriate. If delayed allocation, update the inode delalloc
5688                  * counter now and wait to update the sb counters as
5689                  * xfs_bmap_del_extent() might need to borrow some blocks.
5690                  */
5691                 if (wasdel) {
5692                         ASSERT(startblockval(del.br_startblock) > 0);
5693                         if (isrt) {
5694                                 xfs_filblks_t rtexts;
5695
5696                                 rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
5697                                 do_div(rtexts, mp->m_sb.sb_rextsize);
5698                                 xfs_mod_frextents(mp, (int64_t)rtexts);
5699                                 (void)xfs_trans_reserve_quota_nblks(NULL,
5700                                         ip, -((long)del.br_blockcount), 0,
5701                                         XFS_QMOPT_RES_RTBLKS);
5702                         } else {
5703                                 (void)xfs_trans_reserve_quota_nblks(NULL,
5704                                         ip, -((long)del.br_blockcount), 0,
5705                                         XFS_QMOPT_RES_REGBLKS);
5706                         }
5707                         ip->i_delayed_blks -= del.br_blockcount;
5708                         if (cur)
5709                                 cur->bc_private.b.flags |=
5710                                         XFS_BTCUR_BPRV_WASDEL;
5711                 } else if (cur)
5712                         cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
5713
5714                 error = xfs_bmap_del_extent(ip, tp, &lastx, dfops, cur, &del,
5715                                 &tmp_logflags, whichfork, flags);
5716                 logflags |= tmp_logflags;
5717                 if (error)
5718                         goto error0;
5719
5720                 if (!isrt && wasdel)
5721                         xfs_mod_fdblocks(mp, (int64_t)del.br_blockcount, false);
5722
5723                 bno = del.br_startoff - 1;
5724 nodelete:
5725                 /*
5726                  * If not done go on to the next (previous) record.
5727                  */
5728                 if (bno != (xfs_fileoff_t)-1 && bno >= start) {
5729                         if (lastx >= 0) {
5730                                 xfs_iext_get_extent(ifp, lastx, &got);
5731                                 if (got.br_startoff > bno && --lastx >= 0)
5732                                         xfs_iext_get_extent(ifp, lastx, &got);
5733                         }
5734                         extno++;
5735                 }
5736         }
5737         if (bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0)
5738                 *rlen = 0;
5739         else
5740                 *rlen = bno - start + 1;
5741
5742         /*
5743          * Convert to a btree if necessary.
5744          */
5745         if (xfs_bmap_needs_btree(ip, whichfork)) {
5746                 ASSERT(cur == NULL);
5747                 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, dfops,
5748                         &cur, 0, &tmp_logflags, whichfork);
5749                 logflags |= tmp_logflags;
5750                 if (error)
5751                         goto error0;
5752         }
5753         /*
5754          * transform from btree to extents, give it cur
5755          */
5756         else if (xfs_bmap_wants_extents(ip, whichfork)) {
5757                 ASSERT(cur != NULL);
5758                 error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
5759                         whichfork);
5760                 logflags |= tmp_logflags;
5761                 if (error)
5762                         goto error0;
5763         }
5764         /*
5765          * transform from extents to local?
5766          */
5767         error = 0;
5768 error0:
5769         /*
5770          * Log everything.  Do this after conversion, there's no point in
5771          * logging the extent records if we've converted to btree format.
5772          */
5773         if ((logflags & xfs_ilog_fext(whichfork)) &&
5774             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5775                 logflags &= ~xfs_ilog_fext(whichfork);
5776         else if ((logflags & xfs_ilog_fbroot(whichfork)) &&
5777                  XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5778                 logflags &= ~xfs_ilog_fbroot(whichfork);
5779         /*
5780          * Log inode even in the error case, if the transaction
5781          * is dirty we'll need to shut down the filesystem.
5782          */
5783         if (logflags)
5784                 xfs_trans_log_inode(tp, ip, logflags);
5785         if (cur) {
5786                 if (!error) {
5787                         *firstblock = cur->bc_private.b.firstblock;
5788                         cur->bc_private.b.allocated = 0;
5789                 }
5790                 xfs_btree_del_cursor(cur,
5791                         error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5792         }
5793         return error;
5794 }
5795
5796 /* Unmap a range of a file. */
5797 int
5798 xfs_bunmapi(
5799         xfs_trans_t             *tp,
5800         struct xfs_inode        *ip,
5801         xfs_fileoff_t           bno,
5802         xfs_filblks_t           len,
5803         int                     flags,
5804         xfs_extnum_t            nexts,
5805         xfs_fsblock_t           *firstblock,
5806         struct xfs_defer_ops    *dfops,
5807         int                     *done)
5808 {
5809         int                     error;
5810
5811         error = __xfs_bunmapi(tp, ip, bno, &len, flags, nexts, firstblock,
5812                         dfops);
5813         *done = (len == 0);
5814         return error;
5815 }
5816
5817 /*
5818  * Determine whether an extent shift can be accomplished by a merge with the
5819  * extent that precedes the target hole of the shift.
5820  */
5821 STATIC bool
5822 xfs_bmse_can_merge(
5823         struct xfs_bmbt_irec    *left,  /* preceding extent */
5824         struct xfs_bmbt_irec    *got,   /* current extent to shift */
5825         xfs_fileoff_t           shift)  /* shift fsb */
5826 {
5827         xfs_fileoff_t           startoff;
5828
5829         startoff = got->br_startoff - shift;
5830
5831         /*
5832          * The extent, once shifted, must be adjacent in-file and on-disk with
5833          * the preceding extent.
5834          */
5835         if ((left->br_startoff + left->br_blockcount != startoff) ||
5836             (left->br_startblock + left->br_blockcount != got->br_startblock) ||
5837             (left->br_state != got->br_state) ||
5838             (left->br_blockcount + got->br_blockcount > MAXEXTLEN))
5839                 return false;
5840
5841         return true;
5842 }
5843
5844 /*
5845  * A bmap extent shift adjusts the file offset of an extent to fill a preceding
5846  * hole in the file. If an extent shift would result in the extent being fully
5847  * adjacent to the extent that currently precedes the hole, we can merge with
5848  * the preceding extent rather than do the shift.
5849  *
5850  * This function assumes the caller has verified a shift-by-merge is possible
5851  * with the provided extents via xfs_bmse_can_merge().
5852  */
5853 STATIC int
5854 xfs_bmse_merge(
5855         struct xfs_inode                *ip,
5856         int                             whichfork,
5857         xfs_fileoff_t                   shift,          /* shift fsb */
5858         int                             current_ext,    /* idx of gotp */
5859         struct xfs_bmbt_rec_host        *gotp,          /* extent to shift */
5860         struct xfs_bmbt_rec_host        *leftp,         /* preceding extent */
5861         struct xfs_btree_cur            *cur,
5862         int                             *logflags)      /* output */
5863 {
5864         struct xfs_bmbt_irec            got;
5865         struct xfs_bmbt_irec            left;
5866         xfs_filblks_t                   blockcount;
5867         int                             error, i;
5868         struct xfs_mount                *mp = ip->i_mount;
5869
5870         xfs_bmbt_get_all(gotp, &got);
5871         xfs_bmbt_get_all(leftp, &left);
5872         blockcount = left.br_blockcount + got.br_blockcount;
5873
5874         ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
5875         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
5876         ASSERT(xfs_bmse_can_merge(&left, &got, shift));
5877
5878         /*
5879          * Merge the in-core extents. Note that the host record pointers and
5880          * current_ext index are invalid once the extent has been removed via
5881          * xfs_iext_remove().
5882          */
5883         xfs_bmbt_set_blockcount(leftp, blockcount);
5884         xfs_iext_remove(ip, current_ext, 1, 0);
5885
5886         /*
5887          * Update the on-disk extent count, the btree if necessary and log the
5888          * inode.
5889          */
5890         XFS_IFORK_NEXT_SET(ip, whichfork,
5891                            XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
5892         *logflags |= XFS_ILOG_CORE;
5893         if (!cur) {
5894                 *logflags |= XFS_ILOG_DEXT;
5895                 return 0;
5896         }
5897
5898         /* lookup and remove the extent to merge */
5899         error = xfs_bmbt_lookup_eq(cur, got.br_startoff, got.br_startblock,
5900                                    got.br_blockcount, &i);
5901         if (error)
5902                 return error;
5903         XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
5904
5905         error = xfs_btree_delete(cur, &i);
5906         if (error)
5907                 return error;
5908         XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
5909
5910         /* lookup and update size of the previous extent */
5911         error = xfs_bmbt_lookup_eq(cur, left.br_startoff, left.br_startblock,
5912                                    left.br_blockcount, &i);
5913         if (error)
5914                 return error;
5915         XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
5916
5917         left.br_blockcount = blockcount;
5918
5919         return xfs_bmbt_update(cur, left.br_startoff, left.br_startblock,
5920                                left.br_blockcount, left.br_state);
5921 }
5922
5923 /*
5924  * Shift a single extent.
5925  */
5926 STATIC int
5927 xfs_bmse_shift_one(
5928         struct xfs_inode                *ip,
5929         int                             whichfork,
5930         xfs_fileoff_t                   offset_shift_fsb,
5931         int                             *current_ext,
5932         struct xfs_bmbt_rec_host        *gotp,
5933         struct xfs_btree_cur            *cur,
5934         int                             *logflags,
5935         enum shift_direction            direction,
5936         struct xfs_defer_ops            *dfops)
5937 {
5938         struct xfs_ifork                *ifp;
5939         struct xfs_mount                *mp;
5940         xfs_fileoff_t                   startoff;
5941         struct xfs_bmbt_rec_host        *adj_irecp;
5942         struct xfs_bmbt_irec            got;
5943         struct xfs_bmbt_irec            adj_irec;
5944         int                             error;
5945         int                             i;
5946         int                             total_extents;
5947
5948         mp = ip->i_mount;
5949         ifp = XFS_IFORK_PTR(ip, whichfork);
5950         total_extents = xfs_iext_count(ifp);
5951
5952         xfs_bmbt_get_all(gotp, &got);
5953
5954         /* delalloc extents should be prevented by caller */
5955         XFS_WANT_CORRUPTED_RETURN(mp, !isnullstartblock(got.br_startblock));
5956
5957         if (direction == SHIFT_LEFT) {
5958                 startoff = got.br_startoff - offset_shift_fsb;
5959
5960                 /*
5961                  * Check for merge if we've got an extent to the left,
5962                  * otherwise make sure there's enough room at the start
5963                  * of the file for the shift.
5964                  */
5965                 if (!*current_ext) {
5966                         if (got.br_startoff < offset_shift_fsb)
5967                                 return -EINVAL;
5968                         goto update_current_ext;
5969                 }
5970                 /*
5971                  * grab the left extent and check for a large
5972                  * enough hole.
5973                  */
5974                 adj_irecp = xfs_iext_get_ext(ifp, *current_ext - 1);
5975                 xfs_bmbt_get_all(adj_irecp, &adj_irec);
5976
5977                 if (startoff <
5978                     adj_irec.br_startoff + adj_irec.br_blockcount)
5979                         return -EINVAL;
5980
5981                 /* check whether to merge the extent or shift it down */
5982                 if (xfs_bmse_can_merge(&adj_irec, &got,
5983                                        offset_shift_fsb)) {
5984                         error = xfs_bmse_merge(ip, whichfork, offset_shift_fsb,
5985                                                *current_ext, gotp, adj_irecp,
5986                                                cur, logflags);
5987                         if (error)
5988                                 return error;
5989                         adj_irec = got;
5990                         goto update_rmap;
5991                 }
5992         } else {
5993                 startoff = got.br_startoff + offset_shift_fsb;
5994                 /* nothing to move if this is the last extent */
5995                 if (*current_ext >= (total_extents - 1))
5996                         goto update_current_ext;
5997                 /*
5998                  * If this is not the last extent in the file, make sure there
5999                  * is enough room between current extent and next extent for
6000                  * accommodating the shift.
6001                  */
6002                 adj_irecp = xfs_iext_get_ext(ifp, *current_ext + 1);
6003                 xfs_bmbt_get_all(adj_irecp, &adj_irec);
6004                 if (startoff + got.br_blockcount > adj_irec.br_startoff)
6005                         return -EINVAL;
6006                 /*
6007                  * Unlike a left shift (which involves a hole punch),
6008                  * a right shift does not modify extent neighbors
6009                  * in any way. We should never find mergeable extents
6010                  * in this scenario. Check anyways and warn if we
6011                  * encounter two extents that could be one.
6012                  */
6013                 if (xfs_bmse_can_merge(&got, &adj_irec, offset_shift_fsb))
6014                         WARN_ON_ONCE(1);
6015         }
6016         /*
6017          * Increment the extent index for the next iteration, update the start
6018          * offset of the in-core extent and update the btree if applicable.
6019          */
6020 update_current_ext:
6021         if (direction == SHIFT_LEFT)
6022                 (*current_ext)++;
6023         else
6024                 (*current_ext)--;
6025         xfs_bmbt_set_startoff(gotp, startoff);
6026         *logflags |= XFS_ILOG_CORE;
6027         adj_irec = got;
6028         if (!cur) {
6029                 *logflags |= XFS_ILOG_DEXT;
6030                 goto update_rmap;
6031         }
6032
6033         error = xfs_bmbt_lookup_eq(cur, got.br_startoff, got.br_startblock,
6034                                    got.br_blockcount, &i);
6035         if (error)
6036                 return error;
6037         XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
6038
6039         got.br_startoff = startoff;
6040         error = xfs_bmbt_update(cur, got.br_startoff, got.br_startblock,
6041                         got.br_blockcount, got.br_state);
6042         if (error)
6043                 return error;
6044
6045 update_rmap:
6046         /* update reverse mapping */
6047         error = xfs_rmap_unmap_extent(mp, dfops, ip, whichfork, &adj_irec);
6048         if (error)
6049                 return error;
6050         adj_irec.br_startoff = startoff;
6051         return xfs_rmap_map_extent(mp, dfops, ip, whichfork, &adj_irec);
6052 }
6053
6054 /*
6055  * Shift extent records to the left/right to cover/create a hole.
6056  *
6057  * The maximum number of extents to be shifted in a single operation is
6058  * @num_exts. @stop_fsb specifies the file offset at which to stop shift and the
6059  * file offset where we've left off is returned in @next_fsb. @offset_shift_fsb
6060  * is the length by which each extent is shifted. If there is no hole to shift
6061  * the extents into, this will be considered invalid operation and we abort
6062  * immediately.
6063  */
6064 int
6065 xfs_bmap_shift_extents(
6066         struct xfs_trans        *tp,
6067         struct xfs_inode        *ip,
6068         xfs_fileoff_t           *next_fsb,
6069         xfs_fileoff_t           offset_shift_fsb,
6070         int                     *done,
6071         xfs_fileoff_t           stop_fsb,
6072         xfs_fsblock_t           *firstblock,
6073         struct xfs_defer_ops    *dfops,
6074         enum shift_direction    direction,
6075         int                     num_exts)
6076 {
6077         struct xfs_btree_cur            *cur = NULL;
6078         struct xfs_bmbt_rec_host        *gotp;
6079         struct xfs_bmbt_irec            got;
6080         struct xfs_mount                *mp = ip->i_mount;
6081         struct xfs_ifork                *ifp;
6082         xfs_extnum_t                    nexts = 0;
6083         xfs_extnum_t                    current_ext;
6084         xfs_extnum_t                    total_extents;
6085         xfs_extnum_t                    stop_extent;
6086         int                             error = 0;
6087         int                             whichfork = XFS_DATA_FORK;
6088         int                             logflags = 0;
6089
6090         if (unlikely(XFS_TEST_ERROR(
6091             (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
6092              XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
6093              mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
6094                 XFS_ERROR_REPORT("xfs_bmap_shift_extents",
6095                                  XFS_ERRLEVEL_LOW, mp);
6096                 return -EFSCORRUPTED;
6097         }
6098
6099         if (XFS_FORCED_SHUTDOWN(mp))
6100                 return -EIO;
6101
6102         ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
6103         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
6104         ASSERT(direction == SHIFT_LEFT || direction == SHIFT_RIGHT);
6105         ASSERT(*next_fsb != NULLFSBLOCK || direction == SHIFT_RIGHT);
6106
6107         ifp = XFS_IFORK_PTR(ip, whichfork);
6108         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
6109                 /* Read in all the extents */
6110                 error = xfs_iread_extents(tp, ip, whichfork);
6111                 if (error)
6112                         return error;
6113         }
6114
6115         if (ifp->if_flags & XFS_IFBROOT) {
6116                 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
6117                 cur->bc_private.b.firstblock = *firstblock;
6118                 cur->bc_private.b.dfops = dfops;
6119                 cur->bc_private.b.flags = 0;
6120         }
6121
6122         /*
6123          * There may be delalloc extents in the data fork before the range we
6124          * are collapsing out, so we cannot use the count of real extents here.
6125          * Instead we have to calculate it from the incore fork.
6126          */
6127         total_extents = xfs_iext_count(ifp);
6128         if (total_extents == 0) {
6129                 *done = 1;
6130                 goto del_cursor;
6131         }
6132
6133         /*
6134          * In case of first right shift, we need to initialize next_fsb
6135          */
6136         if (*next_fsb == NULLFSBLOCK) {
6137                 gotp = xfs_iext_get_ext(ifp, total_extents - 1);
6138                 xfs_bmbt_get_all(gotp, &got);
6139                 *next_fsb = got.br_startoff;
6140                 if (stop_fsb > *next_fsb) {
6141                         *done = 1;
6142                         goto del_cursor;
6143                 }
6144         }
6145
6146         /* Lookup the extent index at which we have to stop */
6147         if (direction == SHIFT_RIGHT) {
6148                 gotp = xfs_iext_bno_to_ext(ifp, stop_fsb, &stop_extent);
6149                 /* Make stop_extent exclusive of shift range */
6150                 stop_extent--;
6151         } else
6152                 stop_extent = total_extents;
6153
6154         /*
6155          * Look up the extent index for the fsb where we start shifting. We can
6156          * henceforth iterate with current_ext as extent list changes are locked
6157          * out via ilock.
6158          *
6159          * gotp can be null in 2 cases: 1) if there are no extents or 2)
6160          * *next_fsb lies in a hole beyond which there are no extents. Either
6161          * way, we are done.
6162          */
6163         gotp = xfs_iext_bno_to_ext(ifp, *next_fsb, &current_ext);
6164         if (!gotp) {
6165                 *done = 1;
6166                 goto del_cursor;
6167         }
6168
6169         /* some sanity checking before we finally start shifting extents */
6170         if ((direction == SHIFT_LEFT && current_ext >= stop_extent) ||
6171              (direction == SHIFT_RIGHT && current_ext <= stop_extent)) {
6172                 error = -EIO;
6173                 goto del_cursor;
6174         }
6175
6176         while (nexts++ < num_exts) {
6177                 error = xfs_bmse_shift_one(ip, whichfork, offset_shift_fsb,
6178                                            &current_ext, gotp, cur, &logflags,
6179                                            direction, dfops);
6180                 if (error)
6181                         goto del_cursor;
6182                 /*
6183                  * If there was an extent merge during the shift, the extent
6184                  * count can change. Update the total and grade the next record.
6185                  */
6186                 if (direction == SHIFT_LEFT) {
6187                         total_extents = xfs_iext_count(ifp);
6188                         stop_extent = total_extents;
6189                 }
6190
6191                 if (current_ext == stop_extent) {
6192                         *done = 1;
6193                         *next_fsb = NULLFSBLOCK;
6194                         break;
6195                 }
6196                 gotp = xfs_iext_get_ext(ifp, current_ext);
6197         }
6198
6199         if (!*done) {
6200                 xfs_bmbt_get_all(gotp, &got);
6201                 *next_fsb = got.br_startoff;
6202         }
6203
6204 del_cursor:
6205         if (cur)
6206                 xfs_btree_del_cursor(cur,
6207                         error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
6208
6209         if (logflags)
6210                 xfs_trans_log_inode(tp, ip, logflags);
6211
6212         return error;
6213 }
6214
6215 /*
6216  * Splits an extent into two extents at split_fsb block such that it is
6217  * the first block of the current_ext. @current_ext is a target extent
6218  * to be split. @split_fsb is a block where the extents is split.
6219  * If split_fsb lies in a hole or the first block of extents, just return 0.
6220  */
6221 STATIC int
6222 xfs_bmap_split_extent_at(
6223         struct xfs_trans        *tp,
6224         struct xfs_inode        *ip,
6225         xfs_fileoff_t           split_fsb,
6226         xfs_fsblock_t           *firstfsb,
6227         struct xfs_defer_ops    *dfops)
6228 {
6229         int                             whichfork = XFS_DATA_FORK;
6230         struct xfs_btree_cur            *cur = NULL;
6231         struct xfs_bmbt_rec_host        *gotp;
6232         struct xfs_bmbt_irec            got;
6233         struct xfs_bmbt_irec            new; /* split extent */
6234         struct xfs_mount                *mp = ip->i_mount;
6235         struct xfs_ifork                *ifp;
6236         xfs_fsblock_t                   gotblkcnt; /* new block count for got */
6237         xfs_extnum_t                    current_ext;
6238         int                             error = 0;
6239         int                             logflags = 0;
6240         int                             i = 0;
6241
6242         if (unlikely(XFS_TEST_ERROR(
6243             (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
6244              XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
6245              mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
6246                 XFS_ERROR_REPORT("xfs_bmap_split_extent_at",
6247                                  XFS_ERRLEVEL_LOW, mp);
6248                 return -EFSCORRUPTED;
6249         }
6250
6251         if (XFS_FORCED_SHUTDOWN(mp))
6252                 return -EIO;
6253
6254         ifp = XFS_IFORK_PTR(ip, whichfork);
6255         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
6256                 /* Read in all the extents */
6257                 error = xfs_iread_extents(tp, ip, whichfork);
6258                 if (error)
6259                         return error;
6260         }
6261
6262         /*
6263          * gotp can be null in 2 cases: 1) if there are no extents
6264          * or 2) split_fsb lies in a hole beyond which there are
6265          * no extents. Either way, we are done.
6266          */
6267         gotp = xfs_iext_bno_to_ext(ifp, split_fsb, &current_ext);
6268         if (!gotp)
6269                 return 0;
6270
6271         xfs_bmbt_get_all(gotp, &got);
6272
6273         /*
6274          * Check split_fsb lies in a hole or the start boundary offset
6275          * of the extent.
6276          */
6277         if (got.br_startoff >= split_fsb)
6278                 return 0;
6279
6280         gotblkcnt = split_fsb - got.br_startoff;
6281         new.br_startoff = split_fsb;
6282         new.br_startblock = got.br_startblock + gotblkcnt;
6283         new.br_blockcount = got.br_blockcount - gotblkcnt;
6284         new.br_state = got.br_state;
6285
6286         if (ifp->if_flags & XFS_IFBROOT) {
6287                 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
6288                 cur->bc_private.b.firstblock = *firstfsb;
6289                 cur->bc_private.b.dfops = dfops;
6290                 cur->bc_private.b.flags = 0;
6291                 error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
6292                                 got.br_startblock,
6293                                 got.br_blockcount,
6294                                 &i);
6295                 if (error)
6296                         goto del_cursor;
6297                 XFS_WANT_CORRUPTED_GOTO(mp, i == 1, del_cursor);
6298         }
6299
6300         xfs_bmbt_set_blockcount(gotp, gotblkcnt);
6301         got.br_blockcount = gotblkcnt;
6302
6303         logflags = XFS_ILOG_CORE;
6304         if (cur) {
6305                 error = xfs_bmbt_update(cur, got.br_startoff,
6306                                 got.br_startblock,
6307                                 got.br_blockcount,
6308                                 got.br_state);
6309                 if (error)
6310                         goto del_cursor;
6311         } else
6312                 logflags |= XFS_ILOG_DEXT;
6313
6314         /* Add new extent */
6315         current_ext++;
6316         xfs_iext_insert(ip, current_ext, 1, &new, 0);
6317         XFS_IFORK_NEXT_SET(ip, whichfork,
6318                            XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
6319
6320         if (cur) {
6321                 error = xfs_bmbt_lookup_eq(cur, new.br_startoff,
6322                                 new.br_startblock, new.br_blockcount,
6323                                 &i);
6324                 if (error)
6325                         goto del_cursor;
6326                 XFS_WANT_CORRUPTED_GOTO(mp, i == 0, del_cursor);
6327                 cur->bc_rec.b.br_state = new.br_state;
6328
6329                 error = xfs_btree_insert(cur, &i);
6330                 if (error)
6331                         goto del_cursor;
6332                 XFS_WANT_CORRUPTED_GOTO(mp, i == 1, del_cursor);
6333         }
6334
6335         /*
6336          * Convert to a btree if necessary.
6337          */
6338         if (xfs_bmap_needs_btree(ip, whichfork)) {
6339                 int tmp_logflags; /* partial log flag return val */
6340
6341                 ASSERT(cur == NULL);
6342                 error = xfs_bmap_extents_to_btree(tp, ip, firstfsb, dfops,
6343                                 &cur, 0, &tmp_logflags, whichfork);
6344                 logflags |= tmp_logflags;
6345         }
6346
6347 del_cursor:
6348         if (cur) {
6349                 cur->bc_private.b.allocated = 0;
6350                 xfs_btree_del_cursor(cur,
6351                                 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
6352         }
6353
6354         if (logflags)
6355                 xfs_trans_log_inode(tp, ip, logflags);
6356         return error;
6357 }
6358
6359 int
6360 xfs_bmap_split_extent(
6361         struct xfs_inode        *ip,
6362         xfs_fileoff_t           split_fsb)
6363 {
6364         struct xfs_mount        *mp = ip->i_mount;
6365         struct xfs_trans        *tp;
6366         struct xfs_defer_ops    dfops;
6367         xfs_fsblock_t           firstfsb;
6368         int                     error;
6369
6370         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write,
6371                         XFS_DIOSTRAT_SPACE_RES(mp, 0), 0, 0, &tp);
6372         if (error)
6373                 return error;
6374
6375         xfs_ilock(ip, XFS_ILOCK_EXCL);
6376         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
6377
6378         xfs_defer_init(&dfops, &firstfsb);
6379
6380         error = xfs_bmap_split_extent_at(tp, ip, split_fsb,
6381                         &firstfsb, &dfops);
6382         if (error)
6383                 goto out;
6384
6385         error = xfs_defer_finish(&tp, &dfops, NULL);
6386         if (error)
6387                 goto out;
6388
6389         return xfs_trans_commit(tp);
6390
6391 out:
6392         xfs_defer_cancel(&dfops);
6393         xfs_trans_cancel(tp);
6394         return error;
6395 }
6396
6397 /* Deferred mapping is only for real extents in the data fork. */
6398 static bool
6399 xfs_bmap_is_update_needed(
6400         struct xfs_bmbt_irec    *bmap)
6401 {
6402         return  bmap->br_startblock != HOLESTARTBLOCK &&
6403                 bmap->br_startblock != DELAYSTARTBLOCK;
6404 }
6405
6406 /* Record a bmap intent. */
6407 static int
6408 __xfs_bmap_add(
6409         struct xfs_mount                *mp,
6410         struct xfs_defer_ops            *dfops,
6411         enum xfs_bmap_intent_type       type,
6412         struct xfs_inode                *ip,
6413         int                             whichfork,
6414         struct xfs_bmbt_irec            *bmap)
6415 {
6416         int                             error;
6417         struct xfs_bmap_intent          *bi;
6418
6419         trace_xfs_bmap_defer(mp,
6420                         XFS_FSB_TO_AGNO(mp, bmap->br_startblock),
6421                         type,
6422                         XFS_FSB_TO_AGBNO(mp, bmap->br_startblock),
6423                         ip->i_ino, whichfork,
6424                         bmap->br_startoff,
6425                         bmap->br_blockcount,
6426                         bmap->br_state);
6427
6428         bi = kmem_alloc(sizeof(struct xfs_bmap_intent), KM_SLEEP | KM_NOFS);
6429         INIT_LIST_HEAD(&bi->bi_list);
6430         bi->bi_type = type;
6431         bi->bi_owner = ip;
6432         bi->bi_whichfork = whichfork;
6433         bi->bi_bmap = *bmap;
6434
6435         error = xfs_defer_join(dfops, bi->bi_owner);
6436         if (error) {
6437                 kmem_free(bi);
6438                 return error;
6439         }
6440
6441         xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_BMAP, &bi->bi_list);
6442         return 0;
6443 }
6444
6445 /* Map an extent into a file. */
6446 int
6447 xfs_bmap_map_extent(
6448         struct xfs_mount        *mp,
6449         struct xfs_defer_ops    *dfops,
6450         struct xfs_inode        *ip,
6451         struct xfs_bmbt_irec    *PREV)
6452 {
6453         if (!xfs_bmap_is_update_needed(PREV))
6454                 return 0;
6455
6456         return __xfs_bmap_add(mp, dfops, XFS_BMAP_MAP, ip,
6457                         XFS_DATA_FORK, PREV);
6458 }
6459
6460 /* Unmap an extent out of a file. */
6461 int
6462 xfs_bmap_unmap_extent(
6463         struct xfs_mount        *mp,
6464         struct xfs_defer_ops    *dfops,
6465         struct xfs_inode        *ip,
6466         struct xfs_bmbt_irec    *PREV)
6467 {
6468         if (!xfs_bmap_is_update_needed(PREV))
6469                 return 0;
6470
6471         return __xfs_bmap_add(mp, dfops, XFS_BMAP_UNMAP, ip,
6472                         XFS_DATA_FORK, PREV);
6473 }
6474
6475 /*
6476  * Process one of the deferred bmap operations.  We pass back the
6477  * btree cursor to maintain our lock on the bmapbt between calls.
6478  */
6479 int
6480 xfs_bmap_finish_one(
6481         struct xfs_trans                *tp,
6482         struct xfs_defer_ops            *dfops,
6483         struct xfs_inode                *ip,
6484         enum xfs_bmap_intent_type       type,
6485         int                             whichfork,
6486         xfs_fileoff_t                   startoff,
6487         xfs_fsblock_t                   startblock,
6488         xfs_filblks_t                   blockcount,
6489         xfs_exntst_t                    state)
6490 {
6491         struct xfs_bmbt_irec            bmap;
6492         int                             nimaps = 1;
6493         xfs_fsblock_t                   firstfsb;
6494         int                             flags = XFS_BMAPI_REMAP;
6495         int                             done;
6496         int                             error = 0;
6497
6498         bmap.br_startblock = startblock;
6499         bmap.br_startoff = startoff;
6500         bmap.br_blockcount = blockcount;
6501         bmap.br_state = state;
6502
6503         trace_xfs_bmap_deferred(tp->t_mountp,
6504                         XFS_FSB_TO_AGNO(tp->t_mountp, startblock), type,
6505                         XFS_FSB_TO_AGBNO(tp->t_mountp, startblock),
6506                         ip->i_ino, whichfork, startoff, blockcount, state);
6507
6508         if (whichfork != XFS_DATA_FORK && whichfork != XFS_ATTR_FORK)
6509                 return -EFSCORRUPTED;
6510         if (whichfork == XFS_ATTR_FORK)
6511                 flags |= XFS_BMAPI_ATTRFORK;
6512
6513         if (XFS_TEST_ERROR(false, tp->t_mountp,
6514                         XFS_ERRTAG_BMAP_FINISH_ONE,
6515                         XFS_RANDOM_BMAP_FINISH_ONE))
6516                 return -EIO;
6517
6518         switch (type) {
6519         case XFS_BMAP_MAP:
6520                 firstfsb = bmap.br_startblock;
6521                 error = xfs_bmapi_write(tp, ip, bmap.br_startoff,
6522                                         bmap.br_blockcount, flags, &firstfsb,
6523                                         bmap.br_blockcount, &bmap, &nimaps,
6524                                         dfops);
6525                 break;
6526         case XFS_BMAP_UNMAP:
6527                 error = xfs_bunmapi(tp, ip, bmap.br_startoff,
6528                                 bmap.br_blockcount, flags, 1, &firstfsb,
6529                                 dfops, &done);
6530                 ASSERT(done);
6531                 break;
6532         default:
6533                 ASSERT(0);
6534                 error = -EFSCORRUPTED;
6535         }
6536
6537         return error;
6538 }