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_icache.h"
  53
  54
  55 kmem_zone_t             *xfs_bmap_free_item_zone;
  56
  57 /*
  58  * Miscellaneous helper functions
  59  */
  60
  61 /*
  62  * Compute and fill in the value of the maximum depth of a bmap btree
  63  * in this filesystem.  Done once, during mount.
  64  */
  65 void
  66 xfs_bmap_compute_maxlevels(
  67         xfs_mount_t     *mp,            /* file system mount structure */
  68         int             whichfork)      /* data or attr fork */
  69 {
  70         int             level;          /* btree level */
  71         uint            maxblocks;      /* max blocks at this level */
  72         uint            maxleafents;    /* max leaf entries possible */
  73         int             maxrootrecs;    /* max records in root block */
  74         int             minleafrecs;    /* min records in leaf block */
  75         int             minnoderecs;    /* min records in node block */
  76         int             sz;             /* root block size */
  77
  78         /*
  79          * The maximum number of extents in a file, hence the maximum
  80          * number of leaf entries, is controlled by the type of di_nextents
  81          * (a signed 32-bit number, xfs_extnum_t), or by di_anextents
  82          * (a signed 16-bit number, xfs_aextnum_t).
  83          *
  84          * Note that we can no longer assume that if we are in ATTR1 that
  85          * the fork offset of all the inodes will be
  86          * (xfs_default_attroffset(ip) >> 3) because we could have mounted
  87          * with ATTR2 and then mounted back with ATTR1, keeping the
  88          * di_forkoff's fixed but probably at various positions. Therefore,
  89          * for both ATTR1 and ATTR2 we have to assume the worst case scenario
  90          * of a minimum size available.
  91          */
  92         if (whichfork == XFS_DATA_FORK) {
  93                 maxleafents = MAXEXTNUM;
  94                 sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
  95         } else {
  96                 maxleafents = MAXAEXTNUM;
  97                 sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
  98         }
  99         maxrootrecs = xfs_bmdr_maxrecs(sz, 0);
 100         minleafrecs = mp->m_bmap_dmnr[0];
 101         minnoderecs = mp->m_bmap_dmnr[1];
 102         maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
 103         for (level = 1; maxblocks > 1; level++) {
 104                 if (maxblocks <= maxrootrecs)
 105                         maxblocks = 1;
 106                 else
 107                         maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
 108         }
 109         mp->m_bm_maxlevels[whichfork] = level;
 110 }
 111
 112 STATIC int                              /* error */
 113 xfs_bmbt_lookup_eq(
 114         struct xfs_btree_cur    *cur,
 115         xfs_fileoff_t           off,
 116         xfs_fsblock_t           bno,
 117         xfs_filblks_t           len,
 118         int                     *stat)  /* success/failure */
 119 {
 120         cur->bc_rec.b.br_startoff = off;
 121         cur->bc_rec.b.br_startblock = bno;
 122         cur->bc_rec.b.br_blockcount = len;
 123         return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
 124 }
 125
 126 STATIC int                              /* error */
 127 xfs_bmbt_lookup_ge(
 128         struct xfs_btree_cur    *cur,
 129         xfs_fileoff_t           off,
 130         xfs_fsblock_t           bno,
 131         xfs_filblks_t           len,
 132         int                     *stat)  /* success/failure */
 133 {
 134         cur->bc_rec.b.br_startoff = off;
 135         cur->bc_rec.b.br_startblock = bno;
 136         cur->bc_rec.b.br_blockcount = len;
 137         return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
 138 }
 139
 140 /*
 141  * Check if the inode needs to be converted to btree format.
 142  */
 143 static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork)
 144 {
 145         return whichfork != XFS_COW_FORK &&
 146                 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
 147                 XFS_IFORK_NEXTENTS(ip, whichfork) >
 148                         XFS_IFORK_MAXEXT(ip, whichfork);
 149 }
 150
 151 /*
 152  * Check if the inode should be converted to extent format.
 153  */
 154 static inline bool xfs_bmap_wants_extents(struct xfs_inode *ip, int whichfork)
 155 {
 156         return whichfork != XFS_COW_FORK &&
 157                 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
 158                 XFS_IFORK_NEXTENTS(ip, whichfork) <=
 159                         XFS_IFORK_MAXEXT(ip, whichfork);
 160 }
 161
 162 /*
 163  * Update the record referred to by cur to the value given
 164  * by [off, bno, len, state].
 165  * This either works (return 0) or gets an EFSCORRUPTED error.
 166  */
 167 STATIC int
 168 xfs_bmbt_update(
 169         struct xfs_btree_cur    *cur,
 170         xfs_fileoff_t           off,
 171         xfs_fsblock_t           bno,
 172         xfs_filblks_t           len,
 173         xfs_exntst_t            state)
 174 {
 175         union xfs_btree_rec     rec;
 176
 177         xfs_bmbt_disk_set_allf(&rec.bmbt, off, bno, len, state);
 178         return xfs_btree_update(cur, &rec);
 179 }
 180
 181 /*
 182  * Compute the worst-case number of indirect blocks that will be used
 183  * for ip's delayed extent of length "len".
 184  */
 185 STATIC xfs_filblks_t
 186 xfs_bmap_worst_indlen(
 187         xfs_inode_t     *ip,            /* incore inode pointer */
 188         xfs_filblks_t   len)            /* delayed extent length */
 189 {
 190         int             level;          /* btree level number */
 191         int             maxrecs;        /* maximum record count at this level */
 192         xfs_mount_t     *mp;            /* mount structure */
 193         xfs_filblks_t   rval;           /* return value */
 194
 195         mp = ip->i_mount;
 196         maxrecs = mp->m_bmap_dmxr[0];
 197         for (level = 0, rval = 0;
 198              level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
 199              level++) {
 200                 len += maxrecs - 1;
 201                 do_div(len, maxrecs);
 202                 rval += len;
 203                 if (len == 1)
 204                         return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
 205                                 level - 1;
 206                 if (level == 0)
 207                         maxrecs = mp->m_bmap_dmxr[1];
 208         }
 209         return rval;
 210 }
 211
 212 /*
 213  * Calculate the default attribute fork offset for newly created inodes.
 214  */
 215 uint
 216 xfs_default_attroffset(
 217         struct xfs_inode        *ip)
 218 {
 219         struct xfs_mount        *mp = ip->i_mount;
 220         uint                    offset;
 221
 222         if (mp->m_sb.sb_inodesize == 256) {
 223                 offset = XFS_LITINO(mp, ip->i_d.di_version) -
 224                                 XFS_BMDR_SPACE_CALC(MINABTPTRS);
 225         } else {
 226                 offset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
 227         }
 228
 229         ASSERT(offset < XFS_LITINO(mp, ip->i_d.di_version));
 230         return offset;
 231 }
 232
 233 /*
 234  * Helper routine to reset inode di_forkoff field when switching
 235  * attribute fork from local to extent format - we reset it where
 236  * possible to make space available for inline data fork extents.
 237  */
 238 STATIC void
 239 xfs_bmap_forkoff_reset(
 240         xfs_inode_t     *ip,
 241         int             whichfork)
 242 {
 243         if (whichfork == XFS_ATTR_FORK &&
 244             ip->i_d.di_format != XFS_DINODE_FMT_DEV &&
 245             ip->i_d.di_format != XFS_DINODE_FMT_UUID &&
 246             ip->i_d.di_format != XFS_DINODE_FMT_BTREE) {
 247                 uint    dfl_forkoff = xfs_default_attroffset(ip) >> 3;
 248
 249                 if (dfl_forkoff > ip->i_d.di_forkoff)
 250                         ip->i_d.di_forkoff = dfl_forkoff;
 251         }
 252 }
 253
 254 #ifdef DEBUG
 255 STATIC struct xfs_buf *
 256 xfs_bmap_get_bp(
 257         struct xfs_btree_cur    *cur,
 258         xfs_fsblock_t           bno)
 259 {
 260         struct xfs_log_item_desc *lidp;
 261         int                     i;
 262
 263         if (!cur)
 264                 return NULL;
 265
 266         for (i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
 267                 if (!cur->bc_bufs[i])
 268                         break;
 269                 if (XFS_BUF_ADDR(cur->bc_bufs[i]) == bno)
 270                         return cur->bc_bufs[i];
 271         }
 272
 273         /* Chase down all the log items to see if the bp is there */
 274         list_for_each_entry(lidp, &cur->bc_tp->t_items, lid_trans) {
 275                 struct xfs_buf_log_item *bip;
 276                 bip = (struct xfs_buf_log_item *)lidp->lid_item;
 277                 if (bip->bli_item.li_type == XFS_LI_BUF &&
 278                     XFS_BUF_ADDR(bip->bli_buf) == bno)
 279                         return bip->bli_buf;
 280         }
 281
 282         return NULL;
 283 }
 284
 285 STATIC void
 286 xfs_check_block(
 287         struct xfs_btree_block  *block,
 288         xfs_mount_t             *mp,
 289         int                     root,
 290         short                   sz)
 291 {
 292         int                     i, j, dmxr;
 293         __be64                  *pp, *thispa;   /* pointer to block address */
 294         xfs_bmbt_key_t          *prevp, *keyp;
 295
 296         ASSERT(be16_to_cpu(block->bb_level) > 0);
 297
 298         prevp = NULL;
 299         for( i = 1; i <= xfs_btree_get_numrecs(block); i++) {
 300                 dmxr = mp->m_bmap_dmxr[0];
 301                 keyp = XFS_BMBT_KEY_ADDR(mp, block, i);
 302
 303                 if (prevp) {
 304                         ASSERT(be64_to_cpu(prevp->br_startoff) <
 305                                be64_to_cpu(keyp->br_startoff));
 306                 }
 307                 prevp = keyp;
 308
 309                 /*
 310                  * Compare the block numbers to see if there are dups.
 311                  */
 312                 if (root)
 313                         pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz);
 314                 else
 315                         pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr);
 316
 317                 for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
 318                         if (root)
 319                                 thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz);
 320                         else
 321                                 thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr);
 322                         if (*thispa == *pp) {
 323                                 xfs_warn(mp, "%s: thispa(%d) == pp(%d) %Ld",
 324                                         __func__, j, i,
 325                                         (unsigned long long)be64_to_cpu(*thispa));
 326                                 panic("%s: ptrs are equal in node\n",
 327                                         __func__);
 328                         }
 329                 }
 330         }
 331 }
 332
 333 /*
 334  * Check that the extents for the inode ip are in the right order in all
 335  * btree leaves. THis becomes prohibitively expensive for large extent count
 336  * files, so don't bother with inodes that have more than 10,000 extents in
 337  * them. The btree record ordering checks will still be done, so for such large
 338  * bmapbt constructs that is going to catch most corruptions.
 339  */
 340 STATIC void
 341 xfs_bmap_check_leaf_extents(
 342         xfs_btree_cur_t         *cur,   /* btree cursor or null */
 343         xfs_inode_t             *ip,            /* incore inode pointer */
 344         int                     whichfork)      /* data or attr fork */
 345 {
 346         struct xfs_btree_block  *block; /* current btree block */
 347         xfs_fsblock_t           bno;    /* block # of "block" */
 348         xfs_buf_t               *bp;    /* buffer for "block" */
 349         int                     error;  /* error return value */
 350         xfs_extnum_t            i=0, j; /* index into the extents list */
 351         xfs_ifork_t             *ifp;   /* fork structure */
 352         int                     level;  /* btree level, for checking */
 353         xfs_mount_t             *mp;    /* file system mount structure */
 354         __be64                  *pp;    /* pointer to block address */
 355         xfs_bmbt_rec_t          *ep;    /* pointer to current extent */
 356         xfs_bmbt_rec_t          last = {0, 0}; /* last extent in prev block */
 357         xfs_bmbt_rec_t          *nextp; /* pointer to next extent */
 358         int                     bp_release = 0;
 359
 360         if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
 361                 return;
 362         }
 363
 364         /* skip large extent count inodes */
 365         if (ip->i_d.di_nextents > 10000)
 366                 return;
 367
 368         bno = NULLFSBLOCK;
 369         mp = ip->i_mount;
 370         ifp = XFS_IFORK_PTR(ip, whichfork);
 371         block = ifp->if_broot;
 372         /*
 373          * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
 374          */
 375         level = be16_to_cpu(block->bb_level);
 376         ASSERT(level > 0);
 377         xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
 378         pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
 379         bno = be64_to_cpu(*pp);
 380
 381         ASSERT(bno != NULLFSBLOCK);
 382         ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
 383         ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
 384
 385         /*
 386          * Go down the tree until leaf level is reached, following the first
 387          * pointer (leftmost) at each level.
 388          */
 389         while (level-- > 0) {
 390                 /* See if buf is in cur first */
 391                 bp_release = 0;
 392                 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
 393                 if (!bp) {
 394                         bp_release = 1;
 395                         error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
 396                                                 XFS_BMAP_BTREE_REF,
 397                                                 &xfs_bmbt_buf_ops);
 398                         if (error)
 399                                 goto error_norelse;
 400                 }
 401                 block = XFS_BUF_TO_BLOCK(bp);
 402                 if (level == 0)
 403                         break;
 404
 405                 /*
 406                  * Check this block for basic sanity (increasing keys and
 407                  * no duplicate blocks).
 408                  */
 409
 410                 xfs_check_block(block, mp, 0, 0);
 411                 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
 412                 bno = be64_to_cpu(*pp);
 413                 XFS_WANT_CORRUPTED_GOTO(mp,
 414                                         XFS_FSB_SANITY_CHECK(mp, bno), error0);
 415                 if (bp_release) {
 416                         bp_release = 0;
 417                         xfs_trans_brelse(NULL, bp);
 418                 }
 419         }
 420
 421         /*
 422          * Here with bp and block set to the leftmost leaf node in the tree.
 423          */
 424         i = 0;
 425
 426         /*
 427          * Loop over all leaf nodes checking that all extents are in the right order.
 428          */
 429         for (;;) {
 430                 xfs_fsblock_t   nextbno;
 431                 xfs_extnum_t    num_recs;
 432
 433
 434                 num_recs = xfs_btree_get_numrecs(block);
 435
 436                 /*
 437                  * Read-ahead the next leaf block, if any.
 438                  */
 439
 440                 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
 441
 442                 /*
 443                  * Check all the extents to make sure they are OK.
 444                  * If we had a previous block, the last entry should
 445                  * conform with the first entry in this one.
 446                  */
 447
 448                 ep = XFS_BMBT_REC_ADDR(mp, block, 1);
 449                 if (i) {
 450                         ASSERT(xfs_bmbt_disk_get_startoff(&last) +
 451                                xfs_bmbt_disk_get_blockcount(&last) <=
 452                                xfs_bmbt_disk_get_startoff(ep));
 453                 }
 454                 for (j = 1; j < num_recs; j++) {
 455                         nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1);
 456                         ASSERT(xfs_bmbt_disk_get_startoff(ep) +
 457                                xfs_bmbt_disk_get_blockcount(ep) <=
 458                                xfs_bmbt_disk_get_startoff(nextp));
 459                         ep = nextp;
 460                 }
 461
 462                 last = *ep;
 463                 i += num_recs;
 464                 if (bp_release) {
 465                         bp_release = 0;
 466                         xfs_trans_brelse(NULL, bp);
 467                 }
 468                 bno = nextbno;
 469                 /*
 470                  * If we've reached the end, stop.
 471                  */
 472                 if (bno == NULLFSBLOCK)
 473                         break;
 474
 475                 bp_release = 0;
 476                 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
 477                 if (!bp) {
 478                         bp_release = 1;
 479                         error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
 480                                                 XFS_BMAP_BTREE_REF,
 481                                                 &xfs_bmbt_buf_ops);
 482                         if (error)
 483                                 goto error_norelse;
 484                 }
 485                 block = XFS_BUF_TO_BLOCK(bp);
 486         }
 487
 488         return;
 489
 490 error0:
 491         xfs_warn(mp, "%s: at error0", __func__);
 492         if (bp_release)
 493                 xfs_trans_brelse(NULL, bp);
 494 error_norelse:
 495         xfs_warn(mp, "%s: BAD after btree leaves for %d extents",
 496                 __func__, i);
 497         panic("%s: CORRUPTED BTREE OR SOMETHING", __func__);
 498         return;
 499 }
 500
 501 /*
 502  * Add bmap trace insert entries for all the contents of the extent records.
 503  */
 504 void
 505 xfs_bmap_trace_exlist(
 506         xfs_inode_t     *ip,            /* incore inode pointer */
 507         xfs_extnum_t    cnt,            /* count of entries in the list */
 508         int             whichfork,      /* data or attr or cow fork */
 509         unsigned long   caller_ip)
 510 {
 511         xfs_extnum_t    idx;            /* extent record index */
 512         xfs_ifork_t     *ifp;           /* inode fork pointer */
 513         int             state = 0;
 514
 515         if (whichfork == XFS_ATTR_FORK)
 516                 state |= BMAP_ATTRFORK;
 517         else if (whichfork == XFS_COW_FORK)
 518                 state |= BMAP_COWFORK;
 519
 520         ifp = XFS_IFORK_PTR(ip, whichfork);
 521         ASSERT(cnt == xfs_iext_count(ifp));
 522         for (idx = 0; idx < cnt; idx++)
 523                 trace_xfs_extlist(ip, idx, state, caller_ip);
 524 }
 525
 526 /*
 527  * Validate that the bmbt_irecs being returned from bmapi are valid
 528  * given the caller's original parameters.  Specifically check the
 529  * ranges of the returned irecs to ensure that they only extend beyond
 530  * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
 531  */
 532 STATIC void
 533 xfs_bmap_validate_ret(
 534         xfs_fileoff_t           bno,
 535         xfs_filblks_t           len,
 536         int                     flags,
 537         xfs_bmbt_irec_t         *mval,
 538         int                     nmap,
 539         int                     ret_nmap)
 540 {
 541         int                     i;              /* index to map values */
 542
 543         ASSERT(ret_nmap <= nmap);
 544
 545         for (i = 0; i < ret_nmap; i++) {
 546                 ASSERT(mval[i].br_blockcount > 0);
 547                 if (!(flags & XFS_BMAPI_ENTIRE)) {
 548                         ASSERT(mval[i].br_startoff >= bno);
 549                         ASSERT(mval[i].br_blockcount <= len);
 550                         ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
 551                                bno + len);
 552                 } else {
 553                         ASSERT(mval[i].br_startoff < bno + len);
 554                         ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
 555                                bno);
 556                 }
 557                 ASSERT(i == 0 ||
 558                        mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
 559                        mval[i].br_startoff);
 560                 ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
 561                        mval[i].br_startblock != HOLESTARTBLOCK);
 562                 ASSERT(mval[i].br_state == XFS_EXT_NORM ||
 563                        mval[i].br_state == XFS_EXT_UNWRITTEN);
 564         }
 565 }
 566
 567 #else
 568 #define xfs_bmap_check_leaf_extents(cur, ip, whichfork)         do { } while (0)
 569 #define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)    do { } while (0)
 570 #endif /* DEBUG */
 571
 572 /*
 573  * bmap free list manipulation functions
 574  */
 575
 576 /*
 577  * Add the extent to the list of extents to be free at transaction end.
 578  * The list is maintained sorted (by block number).
 579  */
 580 void
 581 xfs_bmap_add_free(
 582         struct xfs_mount                *mp,
 583         struct xfs_defer_ops            *dfops,
 584         xfs_fsblock_t                   bno,
 585         xfs_filblks_t                   len,
 586         struct xfs_owner_info           *oinfo)
 587 {
 588         struct xfs_extent_free_item     *new;           /* new element */
 589 #ifdef DEBUG
 590         xfs_agnumber_t          agno;
 591         xfs_agblock_t           agbno;
 592
 593         ASSERT(bno != NULLFSBLOCK);
 594         ASSERT(len > 0);
 595         ASSERT(len <= MAXEXTLEN);
 596         ASSERT(!isnullstartblock(bno));
 597         agno = XFS_FSB_TO_AGNO(mp, bno);
 598         agbno = XFS_FSB_TO_AGBNO(mp, bno);
 599         ASSERT(agno < mp->m_sb.sb_agcount);
 600         ASSERT(agbno < mp->m_sb.sb_agblocks);
 601         ASSERT(len < mp->m_sb.sb_agblocks);
 602         ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
 603 #endif
 604         ASSERT(xfs_bmap_free_item_zone != NULL);
 605
 606         new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
 607         new->xefi_startblock = bno;
 608         new->xefi_blockcount = (xfs_extlen_t)len;
 609         if (oinfo)
 610                 new->xefi_oinfo = *oinfo;
 611         else
 612                 xfs_rmap_skip_owner_update(&new->xefi_oinfo);
 613         trace_xfs_bmap_free_defer(mp, XFS_FSB_TO_AGNO(mp, bno), 0,
 614                         XFS_FSB_TO_AGBNO(mp, bno), len);
 615         xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_FREE, &new->xefi_list);
 616 }
 617
 618 /*
 619  * Inode fork format manipulation functions
 620  */
 621
 622 /*
 623  * Transform a btree format file with only one leaf node, where the
 624  * extents list will fit in the inode, into an extents format file.
 625  * Since the file extents are already in-core, all we have to do is
 626  * give up the space for the btree root and pitch the leaf block.
 627  */
 628 STATIC int                              /* error */
 629 xfs_bmap_btree_to_extents(
 630         xfs_trans_t             *tp,    /* transaction pointer */
 631         xfs_inode_t             *ip,    /* incore inode pointer */
 632         xfs_btree_cur_t         *cur,   /* btree cursor */
 633         int                     *logflagsp, /* inode logging flags */
 634         int                     whichfork)  /* data or attr fork */
 635 {
 636         /* REFERENCED */
 637         struct xfs_btree_block  *cblock;/* child btree block */
 638         xfs_fsblock_t           cbno;   /* child block number */
 639         xfs_buf_t               *cbp;   /* child block's buffer */
 640         int                     error;  /* error return value */
 641         xfs_ifork_t             *ifp;   /* inode fork data */
 642         xfs_mount_t             *mp;    /* mount point structure */
 643         __be64                  *pp;    /* ptr to block address */
 644         struct xfs_btree_block  *rblock;/* root btree block */
 645         struct xfs_owner_info   oinfo;
 646
 647         mp = ip->i_mount;
 648         ifp = XFS_IFORK_PTR(ip, whichfork);
 649         ASSERT(whichfork != XFS_COW_FORK);
 650         ASSERT(ifp->if_flags & XFS_IFEXTENTS);
 651         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
 652         rblock = ifp->if_broot;
 653         ASSERT(be16_to_cpu(rblock->bb_level) == 1);
 654         ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
 655         ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
 656         pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
 657         cbno = be64_to_cpu(*pp);
 658         *logflagsp = 0;
 659 #ifdef DEBUG
 660         if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
 661                 return error;
 662 #endif
 663         error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp, XFS_BMAP_BTREE_REF,
 664                                 &xfs_bmbt_buf_ops);
 665         if (error)
 666                 return error;
 667         cblock = XFS_BUF_TO_BLOCK(cbp);
 668         if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
 669                 return error;
 670         xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, whichfork);
 671         xfs_bmap_add_free(mp, cur->bc_private.b.dfops, cbno, 1, &oinfo);
 672         ip->i_d.di_nblocks--;
 673         xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
 674         xfs_trans_binval(tp, cbp);
 675         if (cur->bc_bufs[0] == cbp)
 676                 cur->bc_bufs[0] = NULL;
 677         xfs_iroot_realloc(ip, -1, whichfork);
 678         ASSERT(ifp->if_broot == NULL);
 679         ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
 680         XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
 681         *logflagsp = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
 682         return 0;
 683 }
 684
 685 /*
 686  * Convert an extents-format file into a btree-format file.
 687  * The new file will have a root block (in the inode) and a single child block.
 688  */
 689 STATIC int                                      /* error */
 690 xfs_bmap_extents_to_btree(
 691         xfs_trans_t             *tp,            /* transaction pointer */
 692         xfs_inode_t             *ip,            /* incore inode pointer */
 693         xfs_fsblock_t           *firstblock,    /* first-block-allocated */
 694         struct xfs_defer_ops    *dfops,         /* blocks freed in xaction */
 695         xfs_btree_cur_t         **curp,         /* cursor returned to caller */
 696         int                     wasdel,         /* converting a delayed alloc */
 697         int                     *logflagsp,     /* inode logging flags */
 698         int                     whichfork)      /* data or attr fork */
 699 {
 700         struct xfs_btree_block  *ablock;        /* allocated (child) bt block */
 701         xfs_buf_t               *abp;           /* buffer for ablock */
 702         xfs_alloc_arg_t         args;           /* allocation arguments */
 703         xfs_bmbt_rec_t          *arp;           /* child record pointer */
 704         struct xfs_btree_block  *block;         /* btree root block */
 705         xfs_btree_cur_t         *cur;           /* bmap btree cursor */
 706         xfs_bmbt_rec_host_t     *ep;            /* extent record pointer */
 707         int                     error;          /* error return value */
 708         xfs_extnum_t            i, cnt;         /* extent record index */
 709         xfs_ifork_t             *ifp;           /* inode fork pointer */
 710         xfs_bmbt_key_t          *kp;            /* root block key pointer */
 711         xfs_mount_t             *mp;            /* mount structure */
 712         xfs_extnum_t            nextents;       /* number of file extents */
 713         xfs_bmbt_ptr_t          *pp;            /* root block address pointer */
 714
 715         mp = ip->i_mount;
 716         ASSERT(whichfork != XFS_COW_FORK);
 717         ifp = XFS_IFORK_PTR(ip, whichfork);
 718         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
 719
 720         /*
 721          * Make space in the inode incore.
 722          */
 723         xfs_iroot_realloc(ip, 1, whichfork);
 724         ifp->if_flags |= XFS_IFBROOT;
 725
 726         /*
 727          * Fill in the root.
 728          */
 729         block = ifp->if_broot;
 730         xfs_btree_init_block_int(mp, block, XFS_BUF_DADDR_NULL,
 731                                  XFS_BTNUM_BMAP, 1, 1, ip->i_ino,
 732                                  XFS_BTREE_LONG_PTRS);
 733         /*
 734          * Need a cursor.  Can't allocate until bb_level is filled in.
 735          */
 736         cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
 737         cur->bc_private.b.firstblock = *firstblock;
 738         cur->bc_private.b.dfops = dfops;
 739         cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
 740         /*
 741          * Convert to a btree with two levels, one record in root.
 742          */
 743         XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
 744         memset(&args, 0, sizeof(args));
 745         args.tp = tp;
 746         args.mp = mp;
 747         xfs_rmap_ino_bmbt_owner(&args.oinfo, ip->i_ino, whichfork);
 748         args.firstblock = *firstblock;
 749         if (*firstblock == NULLFSBLOCK) {
 750                 args.type = XFS_ALLOCTYPE_START_BNO;
 751                 args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
 752         } else if (dfops->dop_low) {
 753                 args.type = XFS_ALLOCTYPE_START_BNO;
 754                 args.fsbno = *firstblock;
 755         } else {
 756                 args.type = XFS_ALLOCTYPE_NEAR_BNO;
 757                 args.fsbno = *firstblock;
 758         }
 759         args.minlen = args.maxlen = args.prod = 1;
 760         args.wasdel = wasdel;
 761         *logflagsp = 0;
 762         if ((error = xfs_alloc_vextent(&args))) {
 763                 xfs_iroot_realloc(ip, -1, whichfork);
 764                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 765                 return error;
 766         }
 767
 768         if (WARN_ON_ONCE(args.fsbno == NULLFSBLOCK)) {
 769                 xfs_iroot_realloc(ip, -1, whichfork);
 770                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 771                 return -ENOSPC;
 772         }
 773         /*
 774          * Allocation can't fail, the space was reserved.
 775          */
 776         ASSERT(*firstblock == NULLFSBLOCK ||
 777                args.agno >= XFS_FSB_TO_AGNO(mp, *firstblock));
 778         *firstblock = cur->bc_private.b.firstblock = args.fsbno;
 779         cur->bc_private.b.allocated++;
 780         ip->i_d.di_nblocks++;
 781         xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
 782         abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
 783         /*
 784          * Fill in the child block.
 785          */
 786         abp->b_ops = &xfs_bmbt_buf_ops;
 787         ablock = XFS_BUF_TO_BLOCK(abp);
 788         xfs_btree_init_block_int(mp, ablock, abp->b_bn,
 789                                 XFS_BTNUM_BMAP, 0, 0, ip->i_ino,
 790                                 XFS_BTREE_LONG_PTRS);
 791
 792         arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
 793         nextents =  xfs_iext_count(ifp);
 794         for (cnt = i = 0; i < nextents; i++) {
 795                 ep = xfs_iext_get_ext(ifp, i);
 796                 if (!isnullstartblock(xfs_bmbt_get_startblock(ep))) {
 797                         arp->l0 = cpu_to_be64(ep->l0);
 798                         arp->l1 = cpu_to_be64(ep->l1);
 799                         arp++; cnt++;
 800                 }
 801         }
 802         ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
 803         xfs_btree_set_numrecs(ablock, cnt);
 804
 805         /*
 806          * Fill in the root key and pointer.
 807          */
 808         kp = XFS_BMBT_KEY_ADDR(mp, block, 1);
 809         arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
 810         kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
 811         pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur,
 812                                                 be16_to_cpu(block->bb_level)));
 813         *pp = cpu_to_be64(args.fsbno);
 814
 815         /*
 816          * Do all this logging at the end so that
 817          * the root is at the right level.
 818          */
 819         xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS);
 820         xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
 821         ASSERT(*curp == NULL);
 822         *curp = cur;
 823         *logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork);
 824         return 0;
 825 }
 826
 827 /*
 828  * Convert a local file to an extents file.
 829  * This code is out of bounds for data forks of regular files,
 830  * since the file data needs to get logged so things will stay consistent.
 831  * (The bmap-level manipulations are ok, though).
 832  */
 833 void
 834 xfs_bmap_local_to_extents_empty(
 835         struct xfs_inode        *ip,
 836         int                     whichfork)
 837 {
 838         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
 839
 840         ASSERT(whichfork != XFS_COW_FORK);
 841         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
 842         ASSERT(ifp->if_bytes == 0);
 843         ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
 844
 845         xfs_bmap_forkoff_reset(ip, whichfork);
 846         ifp->if_flags &= ~XFS_IFINLINE;
 847         ifp->if_flags |= XFS_IFEXTENTS;
 848         XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
 849 }
 850
 851
 852 STATIC int                              /* error */
 853 xfs_bmap_local_to_extents(
 854         xfs_trans_t     *tp,            /* transaction pointer */
 855         xfs_inode_t     *ip,            /* incore inode pointer */
 856         xfs_fsblock_t   *firstblock,    /* first block allocated in xaction */
 857         xfs_extlen_t    total,          /* total blocks needed by transaction */
 858         int             *logflagsp,     /* inode logging flags */
 859         int             whichfork,
 860         void            (*init_fn)(struct xfs_trans *tp,
 861                                    struct xfs_buf *bp,
 862                                    struct xfs_inode *ip,
 863                                    struct xfs_ifork *ifp))
 864 {
 865         int             error = 0;
 866         int             flags;          /* logging flags returned */
 867         xfs_ifork_t     *ifp;           /* inode fork pointer */
 868         xfs_alloc_arg_t args;           /* allocation arguments */
 869         xfs_buf_t       *bp;            /* buffer for extent block */
 870         struct xfs_bmbt_irec rec;
 871
 872         /*
 873          * We don't want to deal with the case of keeping inode data inline yet.
 874          * So sending the data fork of a regular inode is invalid.
 875          */
 876         ASSERT(!(S_ISREG(VFS_I(ip)->i_mode) && whichfork == XFS_DATA_FORK));
 877         ifp = XFS_IFORK_PTR(ip, whichfork);
 878         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
 879
 880         if (!ifp->if_bytes) {
 881                 xfs_bmap_local_to_extents_empty(ip, whichfork);
 882                 flags = XFS_ILOG_CORE;
 883                 goto done;
 884         }
 885
 886         flags = 0;
 887         error = 0;
 888         ASSERT((ifp->if_flags & (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) ==
 889                                                                 XFS_IFINLINE);
 890         memset(&args, 0, sizeof(args));
 891         args.tp = tp;
 892         args.mp = ip->i_mount;
 893         xfs_rmap_ino_owner(&args.oinfo, ip->i_ino, whichfork, 0);
 894         args.firstblock = *firstblock;
 895         /*
 896          * Allocate a block.  We know we need only one, since the
 897          * file currently fits in an inode.
 898          */
 899         if (*firstblock == NULLFSBLOCK) {
 900                 args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
 901                 args.type = XFS_ALLOCTYPE_START_BNO;
 902         } else {
 903                 args.fsbno = *firstblock;
 904                 args.type = XFS_ALLOCTYPE_NEAR_BNO;
 905         }
 906         args.total = total;
 907         args.minlen = args.maxlen = args.prod = 1;
 908         error = xfs_alloc_vextent(&args);
 909         if (error)
 910                 goto done;
 911
 912         /* Can't fail, the space was reserved. */
 913         ASSERT(args.fsbno != NULLFSBLOCK);
 914         ASSERT(args.len == 1);
 915         *firstblock = args.fsbno;
 916         bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
 917
 918         /*
 919          * Initialize the block, copy the data and log the remote buffer.
 920          *
 921          * The callout is responsible for logging because the remote format
 922          * might differ from the local format and thus we don't know how much to
 923          * log here. Note that init_fn must also set the buffer log item type
 924          * correctly.
 925          */
 926         init_fn(tp, bp, ip, ifp);
 927
 928         /* account for the change in fork size */
 929         xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
 930         xfs_bmap_local_to_extents_empty(ip, whichfork);
 931         flags |= XFS_ILOG_CORE;
 932
 933         rec.br_startoff = 0;
 934         rec.br_startblock = args.fsbno;
 935         rec.br_blockcount = 1;
 936         rec.br_state = XFS_EXT_NORM;
 937         xfs_iext_insert(ip, 0, 1, &rec, 0);
 938
 939         trace_xfs_bmap_post_update(ip, 0,
 940                         whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0,
 941                         _THIS_IP_);
 942         XFS_IFORK_NEXT_SET(ip, whichfork, 1);
 943         ip->i_d.di_nblocks = 1;
 944         xfs_trans_mod_dquot_byino(tp, ip,
 945                 XFS_TRANS_DQ_BCOUNT, 1L);
 946         flags |= xfs_ilog_fext(whichfork);
 947
 948 done:
 949         *logflagsp = flags;
 950         return error;
 951 }
 952
 953 /*
 954  * Called from xfs_bmap_add_attrfork to handle btree format files.
 955  */
 956 STATIC int                                      /* error */
 957 xfs_bmap_add_attrfork_btree(
 958         xfs_trans_t             *tp,            /* transaction pointer */
 959         xfs_inode_t             *ip,            /* incore inode pointer */
 960         xfs_fsblock_t           *firstblock,    /* first block allocated */
 961         struct xfs_defer_ops    *dfops,         /* blocks to free at commit */
 962         int                     *flags)         /* inode logging flags */
 963 {
 964         xfs_btree_cur_t         *cur;           /* btree cursor */
 965         int                     error;          /* error return value */
 966         xfs_mount_t             *mp;            /* file system mount struct */
 967         int                     stat;           /* newroot status */
 968
 969         mp = ip->i_mount;
 970         if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
 971                 *flags |= XFS_ILOG_DBROOT;
 972         else {
 973                 cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
 974                 cur->bc_private.b.dfops = dfops;
 975                 cur->bc_private.b.firstblock = *firstblock;
 976                 if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
 977                         goto error0;
 978                 /* must be at least one entry */
 979                 XFS_WANT_CORRUPTED_GOTO(mp, stat == 1, error0);
 980                 if ((error = xfs_btree_new_iroot(cur, flags, &stat)))
 981                         goto error0;
 982                 if (stat == 0) {
 983                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 984                         return -ENOSPC;
 985                 }
 986                 *firstblock = cur->bc_private.b.firstblock;
 987                 cur->bc_private.b.allocated = 0;
 988                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 989         }
 990         return 0;
 991 error0:
 992         xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 993         return error;
 994 }
 995
 996 /*
 997  * Called from xfs_bmap_add_attrfork to handle extents format files.
 998  */
 999 STATIC int                                      /* error */
1000 xfs_bmap_add_attrfork_extents(
1001         xfs_trans_t             *tp,            /* transaction pointer */
1002         xfs_inode_t             *ip,            /* incore inode pointer */
1003         xfs_fsblock_t           *firstblock,    /* first block allocated */
1004         struct xfs_defer_ops    *dfops,         /* blocks to free at commit */
1005         int                     *flags)         /* inode logging flags */
1006 {
1007         xfs_btree_cur_t         *cur;           /* bmap btree cursor */
1008         int                     error;          /* error return value */
1009
1010         if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
1011                 return 0;
1012         cur = NULL;
1013         error = xfs_bmap_extents_to_btree(tp, ip, firstblock, dfops, &cur, 0,
1014                 flags, XFS_DATA_FORK);
1015         if (cur) {
1016                 cur->bc_private.b.allocated = 0;
1017                 xfs_btree_del_cursor(cur,
1018                         error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
1019         }
1020         return error;
1021 }
1022
1023 /*
1024  * Called from xfs_bmap_add_attrfork to handle local format files. Each
1025  * different data fork content type needs a different callout to do the
1026  * conversion. Some are basic and only require special block initialisation
1027  * callouts for the data formating, others (directories) are so specialised they
1028  * handle everything themselves.
1029  *
1030  * XXX (dgc): investigate whether directory conversion can use the generic
1031  * formatting callout. It should be possible - it's just a very complex
1032  * formatter.
1033  */
1034 STATIC int                                      /* error */
1035 xfs_bmap_add_attrfork_local(
1036         xfs_trans_t             *tp,            /* transaction pointer */
1037         xfs_inode_t             *ip,            /* incore inode pointer */
1038         xfs_fsblock_t           *firstblock,    /* first block allocated */
1039         struct xfs_defer_ops    *dfops,         /* blocks to free at commit */
1040         int                     *flags)         /* inode logging flags */
1041 {
1042         xfs_da_args_t           dargs;          /* args for dir/attr code */
1043
1044         if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
1045                 return 0;
1046
1047         if (S_ISDIR(VFS_I(ip)->i_mode)) {
1048                 memset(&dargs, 0, sizeof(dargs));
1049                 dargs.geo = ip->i_mount->m_dir_geo;
1050                 dargs.dp = ip;
1051                 dargs.firstblock = firstblock;
1052                 dargs.dfops = dfops;
1053                 dargs.total = dargs.geo->fsbcount;
1054                 dargs.whichfork = XFS_DATA_FORK;
1055                 dargs.trans = tp;
1056                 return xfs_dir2_sf_to_block(&dargs);
1057         }
1058
1059         if (S_ISLNK(VFS_I(ip)->i_mode))
1060                 return xfs_bmap_local_to_extents(tp, ip, firstblock, 1,
1061                                                  flags, XFS_DATA_FORK,
1062                                                  xfs_symlink_local_to_remote);
1063
1064         /* should only be called for types that support local format data */
1065         ASSERT(0);
1066         return -EFSCORRUPTED;
1067 }
1068
1069 /*
1070  * Convert inode from non-attributed to attributed.
1071  * Must not be in a transaction, ip must not be locked.
1072  */
1073 int                                             /* error code */
1074 xfs_bmap_add_attrfork(
1075         xfs_inode_t             *ip,            /* incore inode pointer */
1076         int                     size,           /* space new attribute needs */
1077         int                     rsvd)           /* xact may use reserved blks */
1078 {
1079         xfs_fsblock_t           firstblock;     /* 1st block/ag allocated */
1080         struct xfs_defer_ops    dfops;          /* freed extent records */
1081         xfs_mount_t             *mp;            /* mount structure */
1082         xfs_trans_t             *tp;            /* transaction pointer */
1083         int                     blks;           /* space reservation */
1084         int                     version = 1;    /* superblock attr version */
1085         int                     logflags;       /* logging flags */
1086         int                     error;          /* error return value */
1087
1088         ASSERT(XFS_IFORK_Q(ip) == 0);
1089
1090         mp = ip->i_mount;
1091         ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
1092
1093         blks = XFS_ADDAFORK_SPACE_RES(mp);
1094
1095         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_addafork, blks, 0,
1096                         rsvd ? XFS_TRANS_RESERVE : 0, &tp);
1097         if (error)
1098                 return error;
1099
1100         xfs_ilock(ip, XFS_ILOCK_EXCL);
1101         error = xfs_trans_reserve_quota_nblks(tp, ip, blks, 0, rsvd ?
1102                         XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
1103                         XFS_QMOPT_RES_REGBLKS);
1104         if (error)
1105                 goto trans_cancel;
1106         if (XFS_IFORK_Q(ip))
1107                 goto trans_cancel;
1108         if (ip->i_d.di_anextents != 0) {
1109                 error = -EFSCORRUPTED;
1110                 goto trans_cancel;
1111         }
1112         if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
1113                 /*
1114                  * For inodes coming from pre-6.2 filesystems.
1115                  */
1116                 ASSERT(ip->i_d.di_aformat == 0);
1117                 ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
1118         }
1119
1120         xfs_trans_ijoin(tp, ip, 0);
1121         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1122
1123         switch (ip->i_d.di_format) {
1124         case XFS_DINODE_FMT_DEV:
1125                 ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
1126                 break;
1127         case XFS_DINODE_FMT_UUID:
1128                 ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
1129                 break;
1130         case XFS_DINODE_FMT_LOCAL:
1131         case XFS_DINODE_FMT_EXTENTS:
1132         case XFS_DINODE_FMT_BTREE:
1133                 ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
1134                 if (!ip->i_d.di_forkoff)
1135                         ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3;
1136                 else if (mp->m_flags & XFS_MOUNT_ATTR2)
1137                         version = 2;
1138                 break;
1139         default:
1140                 ASSERT(0);
1141                 error = -EINVAL;
1142                 goto trans_cancel;
1143         }
1144
1145         ASSERT(ip->i_afp == NULL);
1146         ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
1147         ip->i_afp->if_flags = XFS_IFEXTENTS;
1148         logflags = 0;
1149         xfs_defer_init(&dfops, &firstblock);
1150         switch (ip->i_d.di_format) {
1151         case XFS_DINODE_FMT_LOCAL:
1152                 error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &dfops,
1153                         &logflags);
1154                 break;
1155         case XFS_DINODE_FMT_EXTENTS:
1156                 error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
1157                         &dfops, &logflags);
1158                 break;
1159         case XFS_DINODE_FMT_BTREE:
1160                 error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &dfops,
1161                         &logflags);
1162                 break;
1163         default:
1164                 error = 0;
1165                 break;
1166         }
1167         if (logflags)
1168                 xfs_trans_log_inode(tp, ip, logflags);
1169         if (error)
1170                 goto bmap_cancel;
1171         if (!xfs_sb_version_hasattr(&mp->m_sb) ||
1172            (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2)) {
1173                 bool log_sb = false;
1174
1175                 spin_lock(&mp->m_sb_lock);
1176                 if (!xfs_sb_version_hasattr(&mp->m_sb)) {
1177                         xfs_sb_version_addattr(&mp->m_sb);
1178                         log_sb = true;
1179                 }
1180                 if (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2) {
1181                         xfs_sb_version_addattr2(&mp->m_sb);
1182                         log_sb = true;
1183                 }
1184                 spin_unlock(&mp->m_sb_lock);
1185                 if (log_sb)
1186                         xfs_log_sb(tp);
1187         }
1188
1189         error = xfs_defer_finish(&tp, &dfops);
1190         if (error)
1191                 goto bmap_cancel;
1192         error = xfs_trans_commit(tp);
1193         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1194         return error;
1195
1196 bmap_cancel:
1197         xfs_defer_cancel(&dfops);
1198 trans_cancel:
1199         xfs_trans_cancel(tp);
1200         xfs_iunlock(ip, XFS_ILOCK_EXCL);
1201         return error;
1202 }
1203
1204 /*
1205  * Internal and external extent tree search functions.
1206  */
1207
1208 /*
1209  * Read in the extents to if_extents.
1210  * All inode fields are set up by caller, we just traverse the btree
1211  * and copy the records in. If the file system cannot contain unwritten
1212  * extents, the records are checked for no "state" flags.
1213  */
1214 int                                     /* error */
1215 xfs_bmap_read_extents(
1216         xfs_trans_t             *tp,    /* transaction pointer */
1217         xfs_inode_t             *ip,    /* incore inode */
1218         int                     whichfork) /* data or attr fork */
1219 {
1220         struct xfs_btree_block  *block; /* current btree block */
1221         xfs_fsblock_t           bno;    /* block # of "block" */
1222         xfs_buf_t               *bp;    /* buffer for "block" */
1223         int                     error;  /* error return value */
1224         xfs_extnum_t            i, j;   /* index into the extents list */
1225         xfs_ifork_t             *ifp;   /* fork structure */
1226         int                     level;  /* btree level, for checking */
1227         xfs_mount_t             *mp;    /* file system mount structure */
1228         __be64                  *pp;    /* pointer to block address */
1229         /* REFERENCED */
1230         xfs_extnum_t            room;   /* number of entries there's room for */
1231
1232         mp = ip->i_mount;
1233         ifp = XFS_IFORK_PTR(ip, whichfork);
1234         block = ifp->if_broot;
1235         /*
1236          * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
1237          */
1238         level = be16_to_cpu(block->bb_level);
1239         ASSERT(level > 0);
1240         pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
1241         bno = be64_to_cpu(*pp);
1242
1243         /*
1244          * Go down the tree until leaf level is reached, following the first
1245          * pointer (leftmost) at each level.
1246          */
1247         while (level-- > 0) {
1248                 error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
1249                                 XFS_BMAP_BTREE_REF, &xfs_bmbt_buf_ops);
1250                 if (error)
1251                         return error;
1252                 block = XFS_BUF_TO_BLOCK(bp);
1253                 if (level == 0)
1254                         break;
1255                 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
1256                 bno = be64_to_cpu(*pp);
1257                 XFS_WANT_CORRUPTED_GOTO(mp,
1258                         XFS_FSB_SANITY_CHECK(mp, bno), error0);
1259                 xfs_trans_brelse(tp, bp);
1260         }
1261         /*
1262          * Here with bp and block set to the leftmost leaf node in the tree.
1263          */
1264         room = xfs_iext_count(ifp);
1265         i = 0;
1266         /*
1267          * Loop over all leaf nodes.  Copy information to the extent records.
1268          */
1269         for (;;) {
1270                 xfs_bmbt_rec_t  *frp;
1271                 xfs_fsblock_t   nextbno;
1272                 xfs_extnum_t    num_recs;
1273
1274                 num_recs = xfs_btree_get_numrecs(block);
1275                 if (unlikely(i + num_recs > room)) {
1276                         ASSERT(i + num_recs <= room);
1277                         xfs_warn(ip->i_mount,
1278                                 "corrupt dinode %Lu, (btree extents).",
1279                                 (unsigned long long) ip->i_ino);
1280                         XFS_CORRUPTION_ERROR("xfs_bmap_read_extents(1)",
1281                                 XFS_ERRLEVEL_LOW, ip->i_mount, block);
1282                         goto error0;
1283                 }
1284                 /*
1285                  * Read-ahead the next leaf block, if any.
1286                  */
1287                 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
1288                 if (nextbno != NULLFSBLOCK)
1289                         xfs_btree_reada_bufl(mp, nextbno, 1,
1290                                              &xfs_bmbt_buf_ops);
1291                 /*
1292                  * Copy records into the extent records.
1293                  */
1294                 frp = XFS_BMBT_REC_ADDR(mp, block, 1);
1295                 for (j = 0; j < num_recs; j++, i++, frp++) {
1296                         xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i);
1297                         trp->l0 = be64_to_cpu(frp->l0);
1298                         trp->l1 = be64_to_cpu(frp->l1);
1299                         if (!xfs_bmbt_validate_extent(mp, whichfork, trp)) {
1300                                 XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
1301                                                  XFS_ERRLEVEL_LOW, mp);
1302                                 goto error0;
1303                         }
1304                 }
1305                 xfs_trans_brelse(tp, bp);
1306                 bno = nextbno;
1307                 /*
1308                  * If we've reached the end, stop.
1309                  */
1310                 if (bno == NULLFSBLOCK)
1311                         break;
1312                 error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
1313                                 XFS_BMAP_BTREE_REF, &xfs_bmbt_buf_ops);
1314                 if (error)
1315                         return error;
1316                 block = XFS_BUF_TO_BLOCK(bp);
1317         }
1318         if (i != XFS_IFORK_NEXTENTS(ip, whichfork))
1319                 return -EFSCORRUPTED;
1320         ASSERT(i == xfs_iext_count(ifp));
1321         XFS_BMAP_TRACE_EXLIST(ip, i, whichfork);
1322         return 0;
1323 error0:
1324         xfs_trans_brelse(tp, bp);
1325         return -EFSCORRUPTED;
1326 }
1327
1328 /*
1329  * Returns the file-relative block number of the first unused block(s)
1330  * in the file with at least "len" logically contiguous blocks free.
1331  * This is the lowest-address hole if the file has holes, else the first block
1332  * past the end of file.
1333  * Return 0 if the file is currently local (in-inode).
1334  */
1335 int                                             /* error */
1336 xfs_bmap_first_unused(
1337         xfs_trans_t     *tp,                    /* transaction pointer */
1338         xfs_inode_t     *ip,                    /* incore inode */
1339         xfs_extlen_t    len,                    /* size of hole to find */
1340         xfs_fileoff_t   *first_unused,          /* unused block */
1341         int             whichfork)              /* data or attr fork */
1342 {
1343         int             error;                  /* error return value */
1344         int             idx;                    /* extent record index */
1345         xfs_ifork_t     *ifp;                   /* inode fork pointer */
1346         xfs_fileoff_t   lastaddr;               /* last block number seen */
1347         xfs_fileoff_t   lowest;                 /* lowest useful block */
1348         xfs_fileoff_t   max;                    /* starting useful block */
1349         xfs_extnum_t    nextents;               /* number of extent entries */
1350
1351         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
1352                XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
1353                XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
1354         if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
1355                 *first_unused = 0;
1356                 return 0;
1357         }
1358         ifp = XFS_IFORK_PTR(ip, whichfork);
1359         if (!(ifp->if_flags & XFS_IFEXTENTS) &&
1360             (error = xfs_iread_extents(tp, ip, whichfork)))
1361                 return error;
1362         lowest = *first_unused;
1363         nextents = xfs_iext_count(ifp);
1364         for (idx = 0, lastaddr = 0, max = lowest; idx < nextents; idx++) {
1365                 struct xfs_bmbt_irec got;
1366
1367                 xfs_iext_get_extent(ifp, idx, &got);
1368
1369                 /*
1370                  * See if the hole before this extent will work.
1371                  */
1372                 if (got.br_startoff >= lowest + len &&
1373                     got.br_startoff - max >= len) {
1374                         *first_unused = max;
1375                         return 0;
1376                 }
1377                 lastaddr = got.br_startoff + got.br_blockcount;
1378                 max = XFS_FILEOFF_MAX(lastaddr, lowest);
1379         }
1380         *first_unused = max;
1381         return 0;
1382 }
1383
1384 /*
1385  * Returns the file-relative block number of the last block - 1 before
1386  * last_block (input value) in the file.
1387  * This is not based on i_size, it is based on the extent records.
1388  * Returns 0 for local files, as they do not have extent records.
1389  */
1390 int                                             /* error */
1391 xfs_bmap_last_before(
1392         struct xfs_trans        *tp,            /* transaction pointer */
1393         struct xfs_inode        *ip,            /* incore inode */
1394         xfs_fileoff_t           *last_block,    /* last block */
1395         int                     whichfork)      /* data or attr fork */
1396 {
1397         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
1398         struct xfs_bmbt_irec    got;
1399         xfs_extnum_t            idx;
1400         int                     error;
1401
1402         switch (XFS_IFORK_FORMAT(ip, whichfork)) {
1403         case XFS_DINODE_FMT_LOCAL:
1404                 *last_block = 0;
1405                 return 0;
1406         case XFS_DINODE_FMT_BTREE:
1407         case XFS_DINODE_FMT_EXTENTS:
1408                 break;
1409         default:
1410                 return -EIO;
1411         }
1412
1413         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1414                 error = xfs_iread_extents(tp, ip, whichfork);
1415                 if (error)
1416                         return error;
1417         }
1418
1419         if (xfs_iext_lookup_extent(ip, ifp, *last_block - 1, &idx, &got)) {
1420                 if (got.br_startoff <= *last_block - 1)
1421                         return 0;
1422         }
1423
1424         if (xfs_iext_get_extent(ifp, idx - 1, &got)) {
1425                 *last_block = got.br_startoff + got.br_blockcount;
1426                 return 0;
1427         }
1428
1429         *last_block = 0;
1430         return 0;
1431 }
1432
1433 int
1434 xfs_bmap_last_extent(
1435         struct xfs_trans        *tp,
1436         struct xfs_inode        *ip,
1437         int                     whichfork,
1438         struct xfs_bmbt_irec    *rec,
1439         int                     *is_empty)
1440 {
1441         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
1442         int                     error;
1443         int                     nextents;
1444
1445         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1446                 error = xfs_iread_extents(tp, ip, whichfork);
1447                 if (error)
1448                         return error;
1449         }
1450
1451         nextents = xfs_iext_count(ifp);
1452         if (nextents == 0) {
1453                 *is_empty = 1;
1454                 return 0;
1455         }
1456
1457         xfs_bmbt_get_all(xfs_iext_get_ext(ifp, nextents - 1), rec);
1458         *is_empty = 0;
1459         return 0;
1460 }
1461
1462 /*
1463  * Check the last inode extent to determine whether this allocation will result
1464  * in blocks being allocated at the end of the file. When we allocate new data
1465  * blocks at the end of the file which do not start at the previous data block,
1466  * we will try to align the new blocks at stripe unit boundaries.
1467  *
1468  * Returns 1 in bma->aeof if the file (fork) is empty as any new write will be
1469  * at, or past the EOF.
1470  */
1471 STATIC int
1472 xfs_bmap_isaeof(
1473         struct xfs_bmalloca     *bma,
1474         int                     whichfork)
1475 {
1476         struct xfs_bmbt_irec    rec;
1477         int                     is_empty;
1478         int                     error;
1479
1480         bma->aeof = 0;
1481         error = xfs_bmap_last_extent(NULL, bma->ip, whichfork, &rec,
1482                                      &is_empty);
1483         if (error)
1484                 return error;
1485
1486         if (is_empty) {
1487                 bma->aeof = 1;
1488                 return 0;
1489         }
1490
1491         /*
1492          * Check if we are allocation or past the last extent, or at least into
1493          * the last delayed allocated extent.
1494          */
1495         bma->aeof = bma->offset >= rec.br_startoff + rec.br_blockcount ||
1496                 (bma->offset >= rec.br_startoff &&
1497                  isnullstartblock(rec.br_startblock));
1498         return 0;
1499 }
1500
1501 /*
1502  * Returns the file-relative block number of the first block past eof in
1503  * the file.  This is not based on i_size, it is based on the extent records.
1504  * Returns 0 for local files, as they do not have extent records.
1505  */
1506 int
1507 xfs_bmap_last_offset(
1508         struct xfs_inode        *ip,
1509         xfs_fileoff_t           *last_block,
1510         int                     whichfork)
1511 {
1512         struct xfs_bmbt_irec    rec;
1513         int                     is_empty;
1514         int                     error;
1515
1516         *last_block = 0;
1517
1518         if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL)
1519                 return 0;
1520
1521         if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
1522             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
1523                return -EIO;
1524
1525         error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, &is_empty);
1526         if (error || is_empty)
1527                 return error;
1528
1529         *last_block = rec.br_startoff + rec.br_blockcount;
1530         return 0;
1531 }
1532
1533 /*
1534  * Returns whether the selected fork of the inode has exactly one
1535  * block or not.  For the data fork we check this matches di_size,
1536  * implying the file's range is 0..bsize-1.
1537  */
1538 int                                     /* 1=>1 block, 0=>otherwise */
1539 xfs_bmap_one_block(
1540         xfs_inode_t     *ip,            /* incore inode */
1541         int             whichfork)      /* data or attr fork */
1542 {
1543         xfs_bmbt_rec_host_t *ep;        /* ptr to fork's extent */
1544         xfs_ifork_t     *ifp;           /* inode fork pointer */
1545         int             rval;           /* return value */
1546         xfs_bmbt_irec_t s;              /* internal version of extent */
1547
1548 #ifndef DEBUG
1549         if (whichfork == XFS_DATA_FORK)
1550                 return XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize;
1551 #endif  /* !DEBUG */
1552         if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
1553                 return 0;
1554         if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
1555                 return 0;
1556         ifp = XFS_IFORK_PTR(ip, whichfork);
1557         ASSERT(ifp->if_flags & XFS_IFEXTENTS);
1558         ep = xfs_iext_get_ext(ifp, 0);
1559         xfs_bmbt_get_all(ep, &s);
1560         rval = s.br_startoff == 0 && s.br_blockcount == 1;
1561         if (rval && whichfork == XFS_DATA_FORK)
1562                 ASSERT(XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize);
1563         return rval;
1564 }
1565
1566 /*
1567  * Extent tree manipulation functions used during allocation.
1568  */
1569
1570 /*
1571  * Convert a delayed allocation to a real allocation.
1572  */
1573 STATIC int                              /* error */
1574 xfs_bmap_add_extent_delay_real(
1575         struct xfs_bmalloca     *bma,
1576         int                     whichfork)
1577 {
1578         struct xfs_bmbt_irec    *new = &bma->got;
1579         int                     diff;   /* temp value */
1580         xfs_bmbt_rec_host_t     *ep;    /* extent entry for idx */
1581         int                     error;  /* error return value */
1582         int                     i;      /* temp state */
1583         xfs_ifork_t             *ifp;   /* inode fork pointer */
1584         xfs_fileoff_t           new_endoff;     /* end offset of new entry */
1585         xfs_bmbt_irec_t         r[3];   /* neighbor extent entries */
1586                                         /* left is 0, right is 1, prev is 2 */
1587         int                     rval=0; /* return value (logging flags) */
1588         int                     state = 0;/* state bits, accessed thru macros */
1589         xfs_filblks_t           da_new; /* new count del alloc blocks used */
1590         xfs_filblks_t           da_old; /* old count del alloc blocks used */
1591         xfs_filblks_t           temp=0; /* value for da_new calculations */
1592         xfs_filblks_t           temp2=0;/* value for da_new calculations */
1593         int                     tmp_rval;       /* partial logging flags */
1594         struct xfs_mount        *mp;
1595         xfs_extnum_t            *nextents;
1596
1597         mp = bma->ip->i_mount;
1598         ifp = XFS_IFORK_PTR(bma->ip, whichfork);
1599         ASSERT(whichfork != XFS_ATTR_FORK);
1600         nextents = (whichfork == XFS_COW_FORK ? &bma->ip->i_cnextents :
1601                                                 &bma->ip->i_d.di_nextents);
1602
1603         ASSERT(bma->idx >= 0);
1604         ASSERT(bma->idx <= xfs_iext_count(ifp));
1605         ASSERT(!isnullstartblock(new->br_startblock));
1606         ASSERT(!bma->cur ||
1607                (bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
1608
1609         XFS_STATS_INC(mp, xs_add_exlist);
1610
1611 #define LEFT            r[0]
1612 #define RIGHT           r[1]
1613 #define PREV            r[2]
1614
1615         if (whichfork == XFS_COW_FORK)
1616                 state |= BMAP_COWFORK;
1617
1618         /*
1619          * Set up a bunch of variables to make the tests simpler.
1620          */
1621         ep = xfs_iext_get_ext(ifp, bma->idx);
1622         xfs_bmbt_get_all(ep, &PREV);
1623         new_endoff = new->br_startoff + new->br_blockcount;
1624         ASSERT(PREV.br_startoff <= new->br_startoff);
1625         ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
1626
1627         da_old = startblockval(PREV.br_startblock);
1628         da_new = 0;
1629
1630         /*
1631          * Set flags determining what part of the previous delayed allocation
1632          * extent is being replaced by a real allocation.
1633          */
1634         if (PREV.br_startoff == new->br_startoff)
1635                 state |= BMAP_LEFT_FILLING;
1636         if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
1637                 state |= BMAP_RIGHT_FILLING;
1638
1639         /*
1640          * Check and set flags if this segment has a left neighbor.
1641          * Don't set contiguous if the combined extent would be too large.
1642          */
1643         if (bma->idx > 0) {
1644                 state |= BMAP_LEFT_VALID;
1645                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &LEFT);
1646
1647                 if (isnullstartblock(LEFT.br_startblock))
1648                         state |= BMAP_LEFT_DELAY;
1649         }
1650
1651         if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
1652             LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
1653             LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
1654             LEFT.br_state == new->br_state &&
1655             LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1656                 state |= BMAP_LEFT_CONTIG;
1657
1658         /*
1659          * Check and set flags if this segment has a right neighbor.
1660          * Don't set contiguous if the combined extent would be too large.
1661          * Also check for all-three-contiguous being too large.
1662          */
1663         if (bma->idx < xfs_iext_count(ifp) - 1) {
1664                 state |= BMAP_RIGHT_VALID;
1665                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx + 1), &RIGHT);
1666
1667                 if (isnullstartblock(RIGHT.br_startblock))
1668                         state |= BMAP_RIGHT_DELAY;
1669         }
1670
1671         if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
1672             new_endoff == RIGHT.br_startoff &&
1673             new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
1674             new->br_state == RIGHT.br_state &&
1675             new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
1676             ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
1677                        BMAP_RIGHT_FILLING)) !=
1678                       (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
1679                        BMAP_RIGHT_FILLING) ||
1680              LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
1681                         <= MAXEXTLEN))
1682                 state |= BMAP_RIGHT_CONTIG;
1683
1684         error = 0;
1685         /*
1686          * Switch out based on the FILLING and CONTIG state bits.
1687          */
1688         switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
1689                          BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
1690         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
1691              BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1692                 /*
1693                  * Filling in all of a previously delayed allocation extent.
1694                  * The left and right neighbors are both contiguous with new.
1695                  */
1696                 bma->idx--;
1697                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1698                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
1699                         LEFT.br_blockcount + PREV.br_blockcount +
1700                         RIGHT.br_blockcount);
1701                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1702
1703                 xfs_iext_remove(bma->ip, bma->idx + 1, 2, state);
1704                 (*nextents)--;
1705                 if (bma->cur == NULL)
1706                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1707                 else {
1708                         rval = XFS_ILOG_CORE;
1709                         error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
1710                                         RIGHT.br_startblock,
1711                                         RIGHT.br_blockcount, &i);
1712                         if (error)
1713                                 goto done;
1714                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1715                         error = xfs_btree_delete(bma->cur, &i);
1716                         if (error)
1717                                 goto done;
1718                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1719                         error = xfs_btree_decrement(bma->cur, 0, &i);
1720                         if (error)
1721                                 goto done;
1722                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1723                         error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
1724                                         LEFT.br_startblock,
1725                                         LEFT.br_blockcount +
1726                                         PREV.br_blockcount +
1727                                         RIGHT.br_blockcount, LEFT.br_state);
1728                         if (error)
1729                                 goto done;
1730                 }
1731                 break;
1732
1733         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1734                 /*
1735                  * Filling in all of a previously delayed allocation extent.
1736                  * The left neighbor is contiguous, the right is not.
1737                  */
1738                 bma->idx--;
1739
1740                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1741                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
1742                         LEFT.br_blockcount + PREV.br_blockcount);
1743                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1744
1745                 xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
1746                 if (bma->cur == NULL)
1747                         rval = XFS_ILOG_DEXT;
1748                 else {
1749                         rval = 0;
1750                         error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
1751                                         LEFT.br_startblock, LEFT.br_blockcount,
1752                                         &i);
1753                         if (error)
1754                                 goto done;
1755                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1756                         error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
1757                                         LEFT.br_startblock,
1758                                         LEFT.br_blockcount +
1759                                         PREV.br_blockcount, LEFT.br_state);
1760                         if (error)
1761                                 goto done;
1762                 }
1763                 break;
1764
1765         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1766                 /*
1767                  * Filling in all of a previously delayed allocation extent.
1768                  * The right neighbor is contiguous, the left is not.
1769                  */
1770                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1771                 xfs_bmbt_set_startblock(ep, new->br_startblock);
1772                 xfs_bmbt_set_blockcount(ep,
1773                         PREV.br_blockcount + RIGHT.br_blockcount);
1774                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1775
1776                 xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
1777                 if (bma->cur == NULL)
1778                         rval = XFS_ILOG_DEXT;
1779                 else {
1780                         rval = 0;
1781                         error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
1782                                         RIGHT.br_startblock,
1783                                         RIGHT.br_blockcount, &i);
1784                         if (error)
1785                                 goto done;
1786                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1787                         error = xfs_bmbt_update(bma->cur, PREV.br_startoff,
1788                                         new->br_startblock,
1789                                         PREV.br_blockcount +
1790                                         RIGHT.br_blockcount, PREV.br_state);
1791                         if (error)
1792                                 goto done;
1793                 }
1794                 break;
1795
1796         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
1797                 /*
1798                  * Filling in all of a previously delayed allocation extent.
1799                  * Neither the left nor right neighbors are contiguous with
1800                  * the new one.
1801                  */
1802                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1803                 xfs_bmbt_set_startblock(ep, new->br_startblock);
1804                 xfs_bmbt_set_state(ep, new->br_state);
1805                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1806
1807                 (*nextents)++;
1808                 if (bma->cur == NULL)
1809                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1810                 else {
1811                         rval = XFS_ILOG_CORE;
1812                         error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
1813                                         new->br_startblock, new->br_blockcount,
1814                                         &i);
1815                         if (error)
1816                                 goto done;
1817                         XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
1818                         bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
1819                         error = xfs_btree_insert(bma->cur, &i);
1820                         if (error)
1821                                 goto done;
1822                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1823                 }
1824                 break;
1825
1826         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
1827                 /*
1828                  * Filling in the first part of a previous delayed allocation.
1829                  * The left neighbor is contiguous.
1830                  */
1831                 trace_xfs_bmap_pre_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
1832                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx - 1),
1833                         LEFT.br_blockcount + new->br_blockcount);
1834                 xfs_bmbt_set_startoff(ep,
1835                         PREV.br_startoff + new->br_blockcount);
1836                 trace_xfs_bmap_post_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
1837
1838                 temp = PREV.br_blockcount - new->br_blockcount;
1839                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1840                 xfs_bmbt_set_blockcount(ep, temp);
1841                 if (bma->cur == NULL)
1842                         rval = XFS_ILOG_DEXT;
1843                 else {
1844                         rval = 0;
1845                         error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
1846                                         LEFT.br_startblock, LEFT.br_blockcount,
1847                                         &i);
1848                         if (error)
1849                                 goto done;
1850                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1851                         error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
1852                                         LEFT.br_startblock,
1853                                         LEFT.br_blockcount +
1854                                         new->br_blockcount,
1855                                         LEFT.br_state);
1856                         if (error)
1857                                 goto done;
1858                 }
1859                 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
1860                         startblockval(PREV.br_startblock));
1861                 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
1862                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1863
1864                 bma->idx--;
1865                 break;
1866
1867         case BMAP_LEFT_FILLING:
1868                 /*
1869                  * Filling in the first part of a previous delayed allocation.
1870                  * The left neighbor is not contiguous.
1871                  */
1872                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1873                 xfs_bmbt_set_startoff(ep, new_endoff);
1874                 temp = PREV.br_blockcount - new->br_blockcount;
1875                 xfs_bmbt_set_blockcount(ep, temp);
1876                 xfs_iext_insert(bma->ip, bma->idx, 1, new, state);
1877                 (*nextents)++;
1878                 if (bma->cur == NULL)
1879                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1880                 else {
1881                         rval = XFS_ILOG_CORE;
1882                         error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
1883                                         new->br_startblock, new->br_blockcount,
1884                                         &i);
1885                         if (error)
1886                                 goto done;
1887                         XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
1888                         bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
1889                         error = xfs_btree_insert(bma->cur, &i);
1890                         if (error)
1891                                 goto done;
1892                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1893                 }
1894
1895                 if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
1896                         error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
1897                                         bma->firstblock, bma->dfops,
1898                                         &bma->cur, 1, &tmp_rval, whichfork);
1899                         rval |= tmp_rval;
1900                         if (error)
1901                                 goto done;
1902                 }
1903                 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
1904                         startblockval(PREV.br_startblock) -
1905                         (bma->cur ? bma->cur->bc_private.b.allocated : 0));
1906                 ep = xfs_iext_get_ext(ifp, bma->idx + 1);
1907                 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
1908                 trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
1909                 break;
1910
1911         case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1912                 /*
1913                  * Filling in the last part of a previous delayed allocation.
1914                  * The right neighbor is contiguous with the new allocation.
1915                  */
1916                 temp = PREV.br_blockcount - new->br_blockcount;
1917                 trace_xfs_bmap_pre_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
1918                 xfs_bmbt_set_blockcount(ep, temp);
1919                 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx + 1),
1920                         new->br_startoff, new->br_startblock,
1921                         new->br_blockcount + RIGHT.br_blockcount,
1922                         RIGHT.br_state);
1923                 trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
1924                 if (bma->cur == NULL)
1925                         rval = XFS_ILOG_DEXT;
1926                 else {
1927                         rval = 0;
1928                         error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
1929                                         RIGHT.br_startblock,
1930                                         RIGHT.br_blockcount, &i);
1931                         if (error)
1932                                 goto done;
1933                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1934                         error = xfs_bmbt_update(bma->cur, new->br_startoff,
1935                                         new->br_startblock,
1936                                         new->br_blockcount +
1937                                         RIGHT.br_blockcount,
1938                                         RIGHT.br_state);
1939                         if (error)
1940                                 goto done;
1941                 }
1942
1943                 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
1944                         startblockval(PREV.br_startblock));
1945                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1946                 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
1947                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1948
1949                 bma->idx++;
1950                 break;
1951
1952         case BMAP_RIGHT_FILLING:
1953                 /*
1954                  * Filling in the last part of a previous delayed allocation.
1955                  * The right neighbor is not contiguous.
1956                  */
1957                 temp = PREV.br_blockcount - new->br_blockcount;
1958                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1959                 xfs_bmbt_set_blockcount(ep, temp);
1960                 xfs_iext_insert(bma->ip, bma->idx + 1, 1, new, state);
1961                 (*nextents)++;
1962                 if (bma->cur == NULL)
1963                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1964                 else {
1965                         rval = XFS_ILOG_CORE;
1966                         error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
1967                                         new->br_startblock, new->br_blockcount,
1968                                         &i);
1969                         if (error)
1970                                 goto done;
1971                         XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
1972                         bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
1973                         error = xfs_btree_insert(bma->cur, &i);
1974                         if (error)
1975                                 goto done;
1976                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
1977                 }
1978
1979                 if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
1980                         error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
1981                                 bma->firstblock, bma->dfops, &bma->cur, 1,
1982                                 &tmp_rval, whichfork);
1983                         rval |= tmp_rval;
1984                         if (error)
1985                                 goto done;
1986                 }
1987                 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
1988                         startblockval(PREV.br_startblock) -
1989                         (bma->cur ? bma->cur->bc_private.b.allocated : 0));
1990                 ep = xfs_iext_get_ext(ifp, bma->idx);
1991                 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
1992                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1993
1994                 bma->idx++;
1995                 break;
1996
1997         case 0:
1998                 /*
1999                  * Filling in the middle part of a previous delayed allocation.
2000                  * Contiguity is impossible here.
2001                  * This case is avoided almost all the time.
2002                  *
2003                  * We start with a delayed allocation:
2004                  *
2005                  * +ddddddddddddddddddddddddddddddddddddddddddddddddddddddd+
2006                  *  PREV @ idx
2007                  *
2008                  * and we are allocating:
2009                  *                     +rrrrrrrrrrrrrrrrr+
2010                  *                            new
2011                  *
2012                  * and we set it up for insertion as:
2013                  * +ddddddddddddddddddd+rrrrrrrrrrrrrrrrr+ddddddddddddddddd+
2014                  *                            new
2015                  *  PREV @ idx          LEFT              RIGHT
2016                  *                      inserted at idx + 1
2017                  */
2018                 temp = new->br_startoff - PREV.br_startoff;
2019                 temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
2020                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, 0, _THIS_IP_);
2021                 xfs_bmbt_set_blockcount(ep, temp);      /* truncate PREV */
2022                 LEFT = *new;
2023                 RIGHT.br_state = PREV.br_state;
2024                 RIGHT.br_startblock = nullstartblock(
2025                                 (int)xfs_bmap_worst_indlen(bma->ip, temp2));
2026                 RIGHT.br_startoff = new_endoff;
2027                 RIGHT.br_blockcount = temp2;
2028                 /* insert LEFT (r[0]) and RIGHT (r[1]) at the same time */
2029                 xfs_iext_insert(bma->ip, bma->idx + 1, 2, &LEFT, state);
2030                 (*nextents)++;
2031                 if (bma->cur == NULL)
2032                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
2033                 else {
2034                         rval = XFS_ILOG_CORE;
2035                         error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
2036                                         new->br_startblock, new->br_blockcount,
2037                                         &i);
2038                         if (error)
2039                                 goto done;
2040                         XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
2041                         bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
2042                         error = xfs_btree_insert(bma->cur, &i);
2043                         if (error)
2044                                 goto done;
2045                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2046                 }
2047
2048                 if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
2049                         error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
2050                                         bma->firstblock, bma->dfops, &bma->cur,
2051                                         1, &tmp_rval, whichfork);
2052                         rval |= tmp_rval;
2053                         if (error)
2054                                 goto done;
2055                 }
2056                 temp = xfs_bmap_worst_indlen(bma->ip, temp);
2057                 temp2 = xfs_bmap_worst_indlen(bma->ip, temp2);
2058                 diff = (int)(temp + temp2 -
2059                              (startblockval(PREV.br_startblock) -
2060                               (bma->cur ?
2061                                bma->cur->bc_private.b.allocated : 0)));
2062                 if (diff > 0) {
2063                         error = xfs_mod_fdblocks(bma->ip->i_mount,
2064                                                  -((int64_t)diff), false);
2065                         ASSERT(!error);
2066                         if (error)
2067                                 goto done;
2068                 }
2069
2070                 ep = xfs_iext_get_ext(ifp, bma->idx);
2071                 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
2072                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
2073                 trace_xfs_bmap_pre_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
2074                 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, bma->idx + 2),
2075                         nullstartblock((int)temp2));
2076                 trace_xfs_bmap_post_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
2077
2078                 bma->idx++;
2079                 da_new = temp + temp2;
2080                 break;
2081
2082         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
2083         case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
2084         case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
2085         case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
2086         case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
2087         case BMAP_LEFT_CONTIG:
2088         case BMAP_RIGHT_CONTIG:
2089                 /*
2090                  * These cases are all impossible.
2091                  */
2092                 ASSERT(0);
2093         }
2094
2095         /* add reverse mapping */
2096         error = xfs_rmap_map_extent(mp, bma->dfops, bma->ip, whichfork, new);
2097         if (error)
2098                 goto done;
2099
2100         /* convert to a btree if necessary */
2101         if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
2102                 int     tmp_logflags;   /* partial log flag return val */
2103
2104                 ASSERT(bma->cur == NULL);
2105                 error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
2106                                 bma->firstblock, bma->dfops, &bma->cur,
2107                                 da_old > 0, &tmp_logflags, whichfork);
2108                 bma->logflags |= tmp_logflags;
2109                 if (error)
2110                         goto done;
2111         }
2112
2113         /* adjust for changes in reserved delayed indirect blocks */
2114         if (da_old || da_new) {
2115                 temp = da_new;
2116                 if (bma->cur)
2117                         temp += bma->cur->bc_private.b.allocated;
2118                 if (temp < da_old)
2119                         xfs_mod_fdblocks(bma->ip->i_mount,
2120                                         (int64_t)(da_old - temp), false);
2121         }
2122
2123         /* clear out the allocated field, done with it now in any case. */
2124         if (bma->cur)
2125                 bma->cur->bc_private.b.allocated = 0;
2126
2127         xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork);
2128 done:
2129         if (whichfork != XFS_COW_FORK)
2130                 bma->logflags |= rval;
2131         return error;
2132 #undef  LEFT
2133 #undef  RIGHT
2134 #undef  PREV
2135 }
2136
2137 /*
2138  * Convert an unwritten allocation to a real allocation or vice versa.
2139  */
2140 STATIC int                              /* error */
2141 xfs_bmap_add_extent_unwritten_real(
2142         struct xfs_trans        *tp,
2143         xfs_inode_t             *ip,    /* incore inode pointer */
2144         int                     whichfork,
2145         xfs_extnum_t            *idx,   /* extent number to update/insert */
2146         xfs_btree_cur_t         **curp, /* if *curp is null, not a btree */
2147         xfs_bmbt_irec_t         *new,   /* new data to add to file extents */
2148         xfs_fsblock_t           *first, /* pointer to firstblock variable */
2149         struct xfs_defer_ops    *dfops, /* list of extents to be freed */
2150         int                     *logflagsp) /* inode logging flags */
2151 {
2152         xfs_btree_cur_t         *cur;   /* btree cursor */
2153         xfs_bmbt_rec_host_t     *ep;    /* extent entry for idx */
2154         int                     error;  /* error return value */
2155         int                     i;      /* temp state */
2156         xfs_ifork_t             *ifp;   /* inode fork pointer */
2157         xfs_fileoff_t           new_endoff;     /* end offset of new entry */
2158         xfs_exntst_t            newext; /* new extent state */
2159         xfs_exntst_t            oldext; /* old extent state */
2160         xfs_bmbt_irec_t         r[3];   /* neighbor extent entries */
2161                                         /* left is 0, right is 1, prev is 2 */
2162         int                     rval=0; /* return value (logging flags) */
2163         int                     state = 0;/* state bits, accessed thru macros */
2164         struct xfs_mount        *mp = ip->i_mount;
2165
2166         *logflagsp = 0;
2167
2168         cur = *curp;
2169         ifp = XFS_IFORK_PTR(ip, whichfork);
2170         if (whichfork == XFS_COW_FORK)
2171                 state |= BMAP_COWFORK;
2172
2173         ASSERT(*idx >= 0);
2174         ASSERT(*idx <= xfs_iext_count(ifp));
2175         ASSERT(!isnullstartblock(new->br_startblock));
2176
2177         XFS_STATS_INC(mp, xs_add_exlist);
2178
2179 #define LEFT            r[0]
2180 #define RIGHT           r[1]
2181 #define PREV            r[2]
2182
2183         /*
2184          * Set up a bunch of variables to make the tests simpler.
2185          */
2186         error = 0;
2187         ep = xfs_iext_get_ext(ifp, *idx);
2188         xfs_bmbt_get_all(ep, &PREV);
2189         newext = new->br_state;
2190         oldext = (newext == XFS_EXT_UNWRITTEN) ?
2191                 XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
2192         ASSERT(PREV.br_state == oldext);
2193         new_endoff = new->br_startoff + new->br_blockcount;
2194         ASSERT(PREV.br_startoff <= new->br_startoff);
2195         ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
2196
2197         /*
2198          * Set flags determining what part of the previous oldext allocation
2199          * extent is being replaced by a newext allocation.
2200          */
2201         if (PREV.br_startoff == new->br_startoff)
2202                 state |= BMAP_LEFT_FILLING;
2203         if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
2204                 state |= BMAP_RIGHT_FILLING;
2205
2206         /*
2207          * Check and set flags if this segment has a left neighbor.
2208          * Don't set contiguous if the combined extent would be too large.
2209          */
2210         if (*idx > 0) {
2211                 state |= BMAP_LEFT_VALID;
2212                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &LEFT);
2213
2214                 if (isnullstartblock(LEFT.br_startblock))
2215                         state |= BMAP_LEFT_DELAY;
2216         }
2217
2218         if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
2219             LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
2220             LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
2221             LEFT.br_state == newext &&
2222             LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
2223                 state |= BMAP_LEFT_CONTIG;
2224
2225         /*
2226          * Check and set flags if this segment has a right neighbor.
2227          * Don't set contiguous if the combined extent would be too large.
2228          * Also check for all-three-contiguous being too large.
2229          */
2230         if (*idx < xfs_iext_count(ifp) - 1) {
2231                 state |= BMAP_RIGHT_VALID;
2232                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx + 1), &RIGHT);
2233                 if (isnullstartblock(RIGHT.br_startblock))
2234                         state |= BMAP_RIGHT_DELAY;
2235         }
2236
2237         if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
2238             new_endoff == RIGHT.br_startoff &&
2239             new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
2240             newext == RIGHT.br_state &&
2241             new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
2242             ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
2243                        BMAP_RIGHT_FILLING)) !=
2244                       (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
2245                        BMAP_RIGHT_FILLING) ||
2246              LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
2247                         <= MAXEXTLEN))
2248                 state |= BMAP_RIGHT_CONTIG;
2249
2250         /*
2251          * Switch out based on the FILLING and CONTIG state bits.
2252          */
2253         switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
2254                          BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
2255         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
2256              BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
2257                 /*
2258                  * Setting all of a previous oldext extent to newext.
2259                  * The left and right neighbors are both contiguous with new.
2260                  */
2261                 --*idx;
2262
2263                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2264                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
2265                         LEFT.br_blockcount + PREV.br_blockcount +
2266                         RIGHT.br_blockcount);
2267                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2268
2269                 xfs_iext_remove(ip, *idx + 1, 2, state);
2270                 XFS_IFORK_NEXT_SET(ip, whichfork,
2271                                 XFS_IFORK_NEXTENTS(ip, whichfork) - 2);
2272                 if (cur == NULL)
2273                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
2274                 else {
2275                         rval = XFS_ILOG_CORE;
2276                         if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
2277                                         RIGHT.br_startblock,
2278                                         RIGHT.br_blockcount, &i)))
2279                                 goto done;
2280                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2281                         if ((error = xfs_btree_delete(cur, &i)))
2282                                 goto done;
2283                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2284                         if ((error = xfs_btree_decrement(cur, 0, &i)))
2285                                 goto done;
2286                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2287                         if ((error = xfs_btree_delete(cur, &i)))
2288                                 goto done;
2289                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2290                         if ((error = xfs_btree_decrement(cur, 0, &i)))
2291                                 goto done;
2292                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2293                         if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
2294                                 LEFT.br_startblock,
2295                                 LEFT.br_blockcount + PREV.br_blockcount +
2296                                 RIGHT.br_blockcount, LEFT.br_state)))
2297                                 goto done;
2298                 }
2299                 break;
2300
2301         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
2302                 /*
2303                  * Setting all of a previous oldext extent to newext.
2304                  * The left neighbor is contiguous, the right is not.
2305                  */
2306                 --*idx;
2307
2308                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2309                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
2310                         LEFT.br_blockcount + PREV.br_blockcount);
2311                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2312
2313                 xfs_iext_remove(ip, *idx + 1, 1, state);
2314                 XFS_IFORK_NEXT_SET(ip, whichfork,
2315                                 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2316                 if (cur == NULL)
2317                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
2318                 else {
2319                         rval = XFS_ILOG_CORE;
2320                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
2321                                         PREV.br_startblock, PREV.br_blockcount,
2322                                         &i)))
2323                                 goto done;
2324                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2325                         if ((error = xfs_btree_delete(cur, &i)))
2326                                 goto done;
2327                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2328                         if ((error = xfs_btree_decrement(cur, 0, &i)))
2329                                 goto done;
2330                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2331                         if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
2332                                 LEFT.br_startblock,
2333                                 LEFT.br_blockcount + PREV.br_blockcount,
2334                                 LEFT.br_state)))
2335                                 goto done;
2336                 }
2337                 break;
2338
2339         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
2340                 /*
2341                  * Setting all of a previous oldext extent to newext.
2342                  * The right neighbor is contiguous, the left is not.
2343                  */
2344                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2345                 xfs_bmbt_set_blockcount(ep,
2346                         PREV.br_blockcount + RIGHT.br_blockcount);
2347                 xfs_bmbt_set_state(ep, newext);
2348                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2349                 xfs_iext_remove(ip, *idx + 1, 1, state);
2350                 XFS_IFORK_NEXT_SET(ip, whichfork,
2351                                 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2352                 if (cur == NULL)
2353                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
2354                 else {
2355                         rval = XFS_ILOG_CORE;
2356                         if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
2357                                         RIGHT.br_startblock,
2358                                         RIGHT.br_blockcount, &i)))
2359                                 goto done;
2360                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2361                         if ((error = xfs_btree_delete(cur, &i)))
2362                                 goto done;
2363                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2364                         if ((error = xfs_btree_decrement(cur, 0, &i)))
2365                                 goto done;
2366                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2367                         if ((error = xfs_bmbt_update(cur, new->br_startoff,
2368                                 new->br_startblock,
2369                                 new->br_blockcount + RIGHT.br_blockcount,
2370                                 newext)))
2371                                 goto done;
2372                 }
2373                 break;
2374
2375         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
2376                 /*
2377                  * Setting all of a previous oldext extent to newext.
2378                  * Neither the left nor right neighbors are contiguous with
2379                  * the new one.
2380                  */
2381                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2382                 xfs_bmbt_set_state(ep, newext);
2383                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2384
2385                 if (cur == NULL)
2386                         rval = XFS_ILOG_DEXT;
2387                 else {
2388                         rval = 0;
2389                         if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
2390                                         new->br_startblock, new->br_blockcount,
2391                                         &i)))
2392                                 goto done;
2393                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2394                         if ((error = xfs_bmbt_update(cur, new->br_startoff,
2395                                 new->br_startblock, new->br_blockcount,
2396                                 newext)))
2397                                 goto done;
2398                 }
2399                 break;
2400
2401         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
2402                 /*
2403                  * Setting the first part of a previous oldext extent to newext.
2404                  * The left neighbor is contiguous.
2405                  */
2406                 trace_xfs_bmap_pre_update(ip, *idx - 1, state, _THIS_IP_);
2407                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx - 1),
2408                         LEFT.br_blockcount + new->br_blockcount);
2409                 xfs_bmbt_set_startoff(ep,
2410                         PREV.br_startoff + new->br_blockcount);
2411                 trace_xfs_bmap_post_update(ip, *idx - 1, state, _THIS_IP_);
2412
2413                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2414                 xfs_bmbt_set_startblock(ep,
2415                         new->br_startblock + new->br_blockcount);
2416                 xfs_bmbt_set_blockcount(ep,
2417                         PREV.br_blockcount - new->br_blockcount);
2418                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2419
2420                 --*idx;
2421
2422                 if (cur == NULL)
2423                         rval = XFS_ILOG_DEXT;
2424                 else {
2425                         rval = 0;
2426                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
2427                                         PREV.br_startblock, PREV.br_blockcount,
2428                                         &i)))
2429                                 goto done;
2430                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2431                         if ((error = xfs_bmbt_update(cur,
2432                                 PREV.br_startoff + new->br_blockcount,
2433                                 PREV.br_startblock + new->br_blockcount,
2434                                 PREV.br_blockcount - new->br_blockcount,
2435                                 oldext)))
2436                                 goto done;
2437                         if ((error = xfs_btree_decrement(cur, 0, &i)))
2438                                 goto done;
2439                         error = xfs_bmbt_update(cur, LEFT.br_startoff,
2440                                 LEFT.br_startblock,
2441                                 LEFT.br_blockcount + new->br_blockcount,
2442                                 LEFT.br_state);
2443                         if (error)
2444                                 goto done;
2445                 }
2446                 break;
2447
2448         case BMAP_LEFT_FILLING:
2449                 /*
2450                  * Setting the first part of a previous oldext extent to newext.
2451                  * The left neighbor is not contiguous.
2452                  */
2453                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2454                 ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
2455                 xfs_bmbt_set_startoff(ep, new_endoff);
2456                 xfs_bmbt_set_blockcount(ep,
2457                         PREV.br_blockcount - new->br_blockcount);
2458                 xfs_bmbt_set_startblock(ep,
2459                         new->br_startblock + new->br_blockcount);
2460                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2461
2462                 xfs_iext_insert(ip, *idx, 1, new, state);
2463                 XFS_IFORK_NEXT_SET(ip, whichfork,
2464                                 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
2465                 if (cur == NULL)
2466                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
2467                 else {
2468                         rval = XFS_ILOG_CORE;
2469                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
2470                                         PREV.br_startblock, PREV.br_blockcount,
2471                                         &i)))
2472                                 goto done;
2473                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2474                         if ((error = xfs_bmbt_update(cur,
2475                                 PREV.br_startoff + new->br_blockcount,
2476                                 PREV.br_startblock + new->br_blockcount,
2477                                 PREV.br_blockcount - new->br_blockcount,
2478                                 oldext)))
2479                                 goto done;
2480                         cur->bc_rec.b = *new;
2481                         if ((error = xfs_btree_insert(cur, &i)))
2482                                 goto done;
2483                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2484                 }
2485                 break;
2486
2487         case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
2488                 /*
2489                  * Setting the last part of a previous oldext extent to newext.
2490                  * The right neighbor is contiguous with the new allocation.
2491                  */
2492                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2493                 xfs_bmbt_set_blockcount(ep,
2494                         PREV.br_blockcount - new->br_blockcount);
2495                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2496
2497                 ++*idx;
2498
2499                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2500                 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
2501                         new->br_startoff, new->br_startblock,
2502                         new->br_blockcount + RIGHT.br_blockcount, newext);
2503                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2504
2505                 if (cur == NULL)
2506                         rval = XFS_ILOG_DEXT;
2507                 else {
2508                         rval = 0;
2509                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
2510                                         PREV.br_startblock,
2511                                         PREV.br_blockcount, &i)))
2512                                 goto done;
2513                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2514                         if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
2515                                 PREV.br_startblock,
2516                                 PREV.br_blockcount - new->br_blockcount,
2517                                 oldext)))
2518                                 goto done;
2519                         if ((error = xfs_btree_increment(cur, 0, &i)))
2520                                 goto done;
2521                         if ((error = xfs_bmbt_update(cur, new->br_startoff,
2522                                 new->br_startblock,
2523                                 new->br_blockcount + RIGHT.br_blockcount,
2524                                 newext)))
2525                                 goto done;
2526                 }
2527                 break;
2528
2529         case BMAP_RIGHT_FILLING:
2530                 /*
2531                  * Setting the last part of a previous oldext extent to newext.
2532                  * The right neighbor is not contiguous.
2533                  */
2534                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2535                 xfs_bmbt_set_blockcount(ep,
2536                         PREV.br_blockcount - new->br_blockcount);
2537                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2538
2539                 ++*idx;
2540                 xfs_iext_insert(ip, *idx, 1, new, state);
2541
2542                 XFS_IFORK_NEXT_SET(ip, whichfork,
2543                                 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
2544                 if (cur == NULL)
2545                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
2546                 else {
2547                         rval = XFS_ILOG_CORE;
2548                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
2549                                         PREV.br_startblock, PREV.br_blockcount,
2550                                         &i)))
2551                                 goto done;
2552                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2553                         if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
2554                                 PREV.br_startblock,
2555                                 PREV.br_blockcount - new->br_blockcount,
2556                                 oldext)))
2557                                 goto done;
2558                         if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
2559                                         new->br_startblock, new->br_blockcount,
2560                                         &i)))
2561                                 goto done;
2562                         XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
2563                         cur->bc_rec.b.br_state = XFS_EXT_NORM;
2564                         if ((error = xfs_btree_insert(cur, &i)))
2565                                 goto done;
2566                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2567                 }
2568                 break;
2569
2570         case 0:
2571                 /*
2572                  * Setting the middle part of a previous oldext extent to
2573                  * newext.  Contiguity is impossible here.
2574                  * One extent becomes three extents.
2575                  */
2576                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2577                 xfs_bmbt_set_blockcount(ep,
2578                         new->br_startoff - PREV.br_startoff);
2579                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2580
2581                 r[0] = *new;
2582                 r[1].br_startoff = new_endoff;
2583                 r[1].br_blockcount =
2584                         PREV.br_startoff + PREV.br_blockcount - new_endoff;
2585                 r[1].br_startblock = new->br_startblock + new->br_blockcount;
2586                 r[1].br_state = oldext;
2587
2588                 ++*idx;
2589                 xfs_iext_insert(ip, *idx, 2, &r[0], state);
2590
2591                 XFS_IFORK_NEXT_SET(ip, whichfork,
2592                                 XFS_IFORK_NEXTENTS(ip, whichfork) + 2);
2593                 if (cur == NULL)
2594                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
2595                 else {
2596                         rval = XFS_ILOG_CORE;
2597                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
2598                                         PREV.br_startblock, PREV.br_blockcount,
2599                                         &i)))
2600                                 goto done;
2601                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2602                         /* new right extent - oldext */
2603                         if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
2604                                 r[1].br_startblock, r[1].br_blockcount,
2605                                 r[1].br_state)))
2606                                 goto done;
2607                         /* new left extent - oldext */
2608                         cur->bc_rec.b = PREV;
2609                         cur->bc_rec.b.br_blockcount =
2610                                 new->br_startoff - PREV.br_startoff;
2611                         if ((error = xfs_btree_insert(cur, &i)))
2612                                 goto done;
2613                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2614                         /*
2615                          * Reset the cursor to the position of the new extent
2616                          * we are about to insert as we can't trust it after
2617                          * the previous insert.
2618                          */
2619                         if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
2620                                         new->br_startblock, new->br_blockcount,
2621                                         &i)))
2622                                 goto done;
2623                         XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
2624                         /* new middle extent - newext */
2625                         cur->bc_rec.b.br_state = new->br_state;
2626                         if ((error = xfs_btree_insert(cur, &i)))
2627                                 goto done;
2628                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2629                 }
2630                 break;
2631
2632         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
2633         case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
2634         case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
2635         case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
2636         case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
2637         case BMAP_LEFT_CONTIG:
2638         case BMAP_RIGHT_CONTIG:
2639                 /*
2640                  * These cases are all impossible.
2641                  */
2642                 ASSERT(0);
2643         }
2644
2645         /* update reverse mappings */
2646         error = xfs_rmap_convert_extent(mp, dfops, ip, whichfork, new);
2647         if (error)
2648                 goto done;
2649
2650         /* convert to a btree if necessary */
2651         if (xfs_bmap_needs_btree(ip, whichfork)) {
2652                 int     tmp_logflags;   /* partial log flag return val */
2653
2654                 ASSERT(cur == NULL);
2655                 error = xfs_bmap_extents_to_btree(tp, ip, first, dfops, &cur,
2656                                 0, &tmp_logflags, whichfork);
2657                 *logflagsp |= tmp_logflags;
2658                 if (error)
2659                         goto done;
2660         }
2661
2662         /* clear out the allocated field, done with it now in any case. */
2663         if (cur) {
2664                 cur->bc_private.b.allocated = 0;
2665                 *curp = cur;
2666         }
2667
2668         xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
2669 done:
2670         *logflagsp |= rval;
2671         return error;
2672 #undef  LEFT
2673 #undef  RIGHT
2674 #undef  PREV
2675 }
2676
2677 /*
2678  * Convert a hole to a delayed allocation.
2679  */
2680 STATIC void
2681 xfs_bmap_add_extent_hole_delay(
2682         xfs_inode_t             *ip,    /* incore inode pointer */
2683         int                     whichfork,
2684         xfs_extnum_t            *idx,   /* extent number to update/insert */
2685         xfs_bmbt_irec_t         *new)   /* new data to add to file extents */
2686 {
2687         xfs_ifork_t             *ifp;   /* inode fork pointer */
2688         xfs_bmbt_irec_t         left;   /* left neighbor extent entry */
2689         xfs_filblks_t           newlen=0;       /* new indirect size */
2690         xfs_filblks_t           oldlen=0;       /* old indirect size */
2691         xfs_bmbt_irec_t         right;  /* right neighbor extent entry */
2692         int                     state;  /* state bits, accessed thru macros */
2693         xfs_filblks_t           temp=0; /* temp for indirect calculations */
2694
2695         ifp = XFS_IFORK_PTR(ip, whichfork);
2696         state = 0;
2697         if (whichfork == XFS_COW_FORK)
2698                 state |= BMAP_COWFORK;
2699         ASSERT(isnullstartblock(new->br_startblock));
2700
2701         /*
2702          * Check and set flags if this segment has a left neighbor
2703          */
2704         if (*idx > 0) {
2705                 state |= BMAP_LEFT_VALID;
2706                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &left);
2707
2708                 if (isnullstartblock(left.br_startblock))
2709                         state |= BMAP_LEFT_DELAY;
2710         }
2711
2712         /*
2713          * Check and set flags if the current (right) segment exists.
2714          * If it doesn't exist, we're converting the hole at end-of-file.
2715          */
2716         if (*idx < xfs_iext_count(ifp)) {
2717                 state |= BMAP_RIGHT_VALID;
2718                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right);
2719
2720                 if (isnullstartblock(right.br_startblock))
2721                         state |= BMAP_RIGHT_DELAY;
2722         }
2723
2724         /*
2725          * Set contiguity flags on the left and right neighbors.
2726          * Don't let extents get too large, even if the pieces are contiguous.
2727          */
2728         if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) &&
2729             left.br_startoff + left.br_blockcount == new->br_startoff &&
2730             left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
2731                 state |= BMAP_LEFT_CONTIG;
2732
2733         if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) &&
2734             new->br_startoff + new->br_blockcount == right.br_startoff &&
2735             new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
2736             (!(state & BMAP_LEFT_CONTIG) ||
2737              (left.br_blockcount + new->br_blockcount +
2738               right.br_blockcount <= MAXEXTLEN)))
2739                 state |= BMAP_RIGHT_CONTIG;
2740
2741         /*
2742          * Switch out based on the contiguity flags.
2743          */
2744         switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
2745         case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
2746                 /*
2747                  * New allocation is contiguous with delayed allocations
2748                  * on the left and on the right.
2749                  * Merge all three into a single extent record.
2750                  */
2751                 --*idx;
2752                 temp = left.br_blockcount + new->br_blockcount +
2753                         right.br_blockcount;
2754
2755                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2756                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
2757                 oldlen = startblockval(left.br_startblock) +
2758                         startblockval(new->br_startblock) +
2759                         startblockval(right.br_startblock);
2760                 newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2761                                          oldlen);
2762                 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
2763                         nullstartblock((int)newlen));
2764                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2765
2766                 xfs_iext_remove(ip, *idx + 1, 1, state);
2767                 break;
2768
2769         case BMAP_LEFT_CONTIG:
2770                 /*
2771                  * New allocation is contiguous with a delayed allocation
2772                  * on the left.
2773                  * Merge the new allocation with the left neighbor.
2774                  */
2775                 --*idx;
2776                 temp = left.br_blockcount + new->br_blockcount;
2777
2778                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2779                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
2780                 oldlen = startblockval(left.br_startblock) +
2781                         startblockval(new->br_startblock);
2782                 newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2783                                          oldlen);
2784                 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
2785                         nullstartblock((int)newlen));
2786                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2787                 break;
2788
2789         case BMAP_RIGHT_CONTIG:
2790                 /*
2791                  * New allocation is contiguous with a delayed allocation
2792                  * on the right.
2793                  * Merge the new allocation with the right neighbor.
2794                  */
2795                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2796                 temp = new->br_blockcount + right.br_blockcount;
2797                 oldlen = startblockval(new->br_startblock) +
2798                         startblockval(right.br_startblock);
2799                 newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2800                                          oldlen);
2801                 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
2802                         new->br_startoff,
2803                         nullstartblock((int)newlen), temp, right.br_state);
2804                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2805                 break;
2806
2807         case 0:
2808                 /*
2809                  * New allocation is not contiguous with another
2810                  * delayed allocation.
2811                  * Insert a new entry.
2812                  */
2813                 oldlen = newlen = 0;
2814                 xfs_iext_insert(ip, *idx, 1, new, state);
2815                 break;
2816         }
2817         if (oldlen != newlen) {
2818                 ASSERT(oldlen > newlen);
2819                 xfs_mod_fdblocks(ip->i_mount, (int64_t)(oldlen - newlen),
2820                                  false);
2821                 /*
2822                  * Nothing to do for disk quota accounting here.
2823                  */
2824         }
2825 }
2826
2827 /*
2828  * Convert a hole to a real allocation.
2829  */
2830 STATIC int                              /* error */
2831 xfs_bmap_add_extent_hole_real(
2832         struct xfs_trans        *tp,
2833         struct xfs_inode        *ip,
2834         int                     whichfork,
2835         xfs_extnum_t            *idx,
2836         struct xfs_btree_cur    **curp,
2837         struct xfs_bmbt_irec    *new,
2838         xfs_fsblock_t           *first,
2839         struct xfs_defer_ops    *dfops,
2840         int                     *logflagsp)
2841 {
2842         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
2843         struct xfs_mount        *mp = ip->i_mount;
2844         struct xfs_btree_cur    *cur = *curp;
2845         int                     error;  /* error return value */
2846         int                     i;      /* temp state */
2847         xfs_bmbt_irec_t         left;   /* left neighbor extent entry */
2848         xfs_bmbt_irec_t         right;  /* right neighbor extent entry */
2849         int                     rval=0; /* return value (logging flags) */
2850         int                     state;  /* state bits, accessed thru macros */
2851
2852         ASSERT(*idx >= 0);
2853         ASSERT(*idx <= xfs_iext_count(ifp));
2854         ASSERT(!isnullstartblock(new->br_startblock));
2855         ASSERT(!cur || !(cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
2856
2857         XFS_STATS_INC(mp, xs_add_exlist);
2858
2859         state = 0;
2860         if (whichfork == XFS_ATTR_FORK)
2861                 state |= BMAP_ATTRFORK;
2862         if (whichfork == XFS_COW_FORK)
2863                 state |= BMAP_COWFORK;
2864
2865         /*
2866          * Check and set flags if this segment has a left neighbor.
2867          */
2868         if (*idx > 0) {
2869                 state |= BMAP_LEFT_VALID;
2870                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &left);
2871                 if (isnullstartblock(left.br_startblock))
2872                         state |= BMAP_LEFT_DELAY;
2873         }
2874
2875         /*
2876          * Check and set flags if this segment has a current value.
2877          * Not true if we're inserting into the "hole" at eof.
2878          */
2879         if (*idx < xfs_iext_count(ifp)) {
2880                 state |= BMAP_RIGHT_VALID;
2881                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right);
2882                 if (isnullstartblock(right.br_startblock))
2883                         state |= BMAP_RIGHT_DELAY;
2884         }
2885
2886         /*
2887          * We're inserting a real allocation between "left" and "right".
2888          * Set the contiguity flags.  Don't let extents get too large.
2889          */
2890         if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
2891             left.br_startoff + left.br_blockcount == new->br_startoff &&
2892             left.br_startblock + left.br_blockcount == new->br_startblock &&
2893             left.br_state == new->br_state &&
2894             left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
2895                 state |= BMAP_LEFT_CONTIG;
2896
2897         if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
2898             new->br_startoff + new->br_blockcount == right.br_startoff &&
2899             new->br_startblock + new->br_blockcount == right.br_startblock &&
2900             new->br_state == right.br_state &&
2901             new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
2902             (!(state & BMAP_LEFT_CONTIG) ||
2903              left.br_blockcount + new->br_blockcount +
2904              right.br_blockcount <= MAXEXTLEN))
2905                 state |= BMAP_RIGHT_CONTIG;
2906
2907         error = 0;
2908         /*
2909          * Select which case we're in here, and implement it.
2910          */
2911         switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
2912         case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
2913                 /*
2914                  * New allocation is contiguous with real allocations on the
2915                  * left and on the right.
2916                  * Merge all three into a single extent record.
2917                  */
2918                 --*idx;
2919                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2920                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
2921                         left.br_blockcount + new->br_blockcount +
2922                         right.br_blockcount);
2923                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2924
2925                 xfs_iext_remove(ip, *idx + 1, 1, state);
2926
2927                 XFS_IFORK_NEXT_SET(ip, whichfork,
2928                         XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2929                 if (cur == NULL) {
2930                         rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
2931                 } else {
2932                         rval = XFS_ILOG_CORE;
2933                         error = xfs_bmbt_lookup_eq(cur, right.br_startoff,
2934                                         right.br_startblock, right.br_blockcount,
2935                                         &i);
2936                         if (error)
2937                                 goto done;
2938                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2939                         error = xfs_btree_delete(cur, &i);
2940                         if (error)
2941                                 goto done;
2942                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2943                         error = xfs_btree_decrement(cur, 0, &i);
2944                         if (error)
2945                                 goto done;
2946                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2947                         error = xfs_bmbt_update(cur, left.br_startoff,
2948                                         left.br_startblock,
2949                                         left.br_blockcount +
2950                                                 new->br_blockcount +
2951                                                 right.br_blockcount,
2952                                         left.br_state);
2953                         if (error)
2954                                 goto done;
2955                 }
2956                 break;
2957
2958         case BMAP_LEFT_CONTIG:
2959                 /*
2960                  * New allocation is contiguous with a real allocation
2961                  * on the left.
2962                  * Merge the new allocation with the left neighbor.
2963                  */
2964                 --*idx;
2965                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2966                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
2967                         left.br_blockcount + new->br_blockcount);
2968                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2969
2970                 if (cur == NULL) {
2971                         rval = xfs_ilog_fext(whichfork);
2972                 } else {
2973                         rval = 0;
2974                         error = xfs_bmbt_lookup_eq(cur, left.br_startoff,
2975                                         left.br_startblock, left.br_blockcount,
2976                                         &i);
2977                         if (error)
2978                                 goto done;
2979                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
2980                         error = xfs_bmbt_update(cur, left.br_startoff,
2981                                         left.br_startblock,
2982                                         left.br_blockcount +
2983                                                 new->br_blockcount,
2984                                         left.br_state);
2985                         if (error)
2986                                 goto done;
2987                 }
2988                 break;
2989
2990         case BMAP_RIGHT_CONTIG:
2991                 /*
2992                  * New allocation is contiguous with a real allocation
2993                  * on the right.
2994                  * Merge the new allocation with the right neighbor.
2995                  */
2996                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2997                 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
2998                         new->br_startoff, new->br_startblock,
2999                         new->br_blockcount + right.br_blockcount,
3000                         right.br_state);
3001                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
3002
3003                 if (cur == NULL) {
3004                         rval = xfs_ilog_fext(whichfork);
3005                 } else {
3006                         rval = 0;
3007                         error = xfs_bmbt_lookup_eq(cur,
3008                                         right.br_startoff,
3009                                         right.br_startblock,
3010                                         right.br_blockcount, &i);
3011                         if (error)
3012                                 goto done;
3013                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
3014                         error = xfs_bmbt_update(cur, new->br_startoff,
3015                                         new->br_startblock,
3016                                         new->br_blockcount +
3017                                                 right.br_blockcount,
3018                                         right.br_state);
3019                         if (error)
3020                                 goto done;
3021                 }
3022                 break;
3023
3024         case 0:
3025                 /*
3026                  * New allocation is not contiguous with another
3027                  * real allocation.
3028                  * Insert a new entry.
3029                  */
3030                 xfs_iext_insert(ip, *idx, 1, new, state);
3031                 XFS_IFORK_NEXT_SET(ip, whichfork,
3032                         XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
3033                 if (cur == NULL) {
3034                         rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
3035                 } else {
3036                         rval = XFS_ILOG_CORE;
3037                         error = xfs_bmbt_lookup_eq(cur,
3038                                         new->br_startoff,
3039                                         new->br_startblock,
3040                                         new->br_blockcount, &i);
3041                         if (error)
3042                                 goto done;
3043                         XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
3044                         cur->bc_rec.b.br_state = new->br_state;
3045                         error = xfs_btree_insert(cur, &i);
3046                         if (error)
3047                                 goto done;
3048                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
3049                 }
3050                 break;
3051         }
3052
3053         /* add reverse mapping */
3054         error = xfs_rmap_map_extent(mp, dfops, ip, whichfork, new);
3055         if (error)
3056                 goto done;
3057
3058         /* convert to a btree if necessary */
3059         if (xfs_bmap_needs_btree(ip, whichfork)) {
3060                 int     tmp_logflags;   /* partial log flag return val */
3061
3062                 ASSERT(cur == NULL);
3063                 error = xfs_bmap_extents_to_btree(tp, ip, first, dfops, curp,
3064                                 0, &tmp_logflags, whichfork);
3065                 *logflagsp |= tmp_logflags;
3066                 cur = *curp;
3067                 if (error)
3068                         goto done;
3069         }
3070
3071         /* clear out the allocated field, done with it now in any case. */
3072         if (cur)
3073                 cur->bc_private.b.allocated = 0;
3074
3075         xfs_bmap_check_leaf_extents(cur, ip, whichfork);
3076 done:
3077         *logflagsp |= rval;
3078         return error;
3079 }
3080
3081 /*
3082  * Functions used in the extent read, allocate and remove paths
3083  */
3084
3085 /*
3086  * Adjust the size of the new extent based on di_extsize and rt extsize.
3087  */
3088 int
3089 xfs_bmap_extsize_align(
3090         xfs_mount_t     *mp,
3091         xfs_bmbt_irec_t *gotp,          /* next extent pointer */
3092         xfs_bmbt_irec_t *prevp,         /* previous extent pointer */
3093         xfs_extlen_t    extsz,          /* align to this extent size */
3094         int             rt,             /* is this a realtime inode? */
3095         int             eof,            /* is extent at end-of-file? */
3096         int             delay,          /* creating delalloc extent? */
3097         int             convert,        /* overwriting unwritten extent? */
3098         xfs_fileoff_t   *offp,          /* in/out: aligned offset */
3099         xfs_extlen_t    *lenp)          /* in/out: aligned length */
3100 {
3101         xfs_fileoff_t   orig_off;       /* original offset */
3102         xfs_extlen_t    orig_alen;      /* original length */
3103         xfs_fileoff_t   orig_end;       /* original off+len */
3104         xfs_fileoff_t   nexto;          /* next file offset */
3105         xfs_fileoff_t   prevo;          /* previous file offset */
3106         xfs_fileoff_t   align_off;      /* temp for offset */
3107         xfs_extlen_t    align_alen;     /* temp for length */
3108         xfs_extlen_t    temp;           /* temp for calculations */
3109
3110         if (convert)
3111                 return 0;
3112
3113         orig_off = align_off = *offp;
3114         orig_alen = align_alen = *lenp;
3115         orig_end = orig_off + orig_alen;
3116
3117         /*
3118          * If this request overlaps an existing extent, then don't
3119          * attempt to perform any additional alignment.
3120          */
3121         if (!delay && !eof &&
3122             (orig_off >= gotp->br_startoff) &&
3123             (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
3124                 return 0;
3125         }
3126
3127         /*
3128          * If the file offset is unaligned vs. the extent size
3129          * we need to align it.  This will be possible unless
3130          * the file was previously written with a kernel that didn't
3131          * perform this alignment, or if a truncate shot us in the
3132          * foot.
3133          */
3134         temp = do_mod(orig_off, extsz);
3135         if (temp) {
3136                 align_alen += temp;
3137                 align_off -= temp;
3138         }
3139
3140         /* Same adjustment for the end of the requested area. */
3141         temp = (align_alen % extsz);
3142         if (temp)
3143                 align_alen += extsz - temp;
3144
3145         /*
3146          * For large extent hint sizes, the aligned extent might be larger than
3147          * MAXEXTLEN. In that case, reduce the size by an extsz so that it pulls
3148          * the length back under MAXEXTLEN. The outer allocation loops handle
3149          * short allocation just fine, so it is safe to do this. We only want to
3150          * do it when we are forced to, though, because it means more allocation
3151          * operations are required.
3152          */
3153         while (align_alen > MAXEXTLEN)
3154                 align_alen -= extsz;
3155         ASSERT(align_alen <= MAXEXTLEN);
3156
3157         /*
3158          * If the previous block overlaps with this proposed allocation
3159          * then move the start forward without adjusting the length.
3160          */
3161         if (prevp->br_startoff != NULLFILEOFF) {
3162                 if (prevp->br_startblock == HOLESTARTBLOCK)
3163                         prevo = prevp->br_startoff;
3164                 else
3165                         prevo = prevp->br_startoff + prevp->br_blockcount;
3166         } else
3167                 prevo = 0;
3168         if (align_off != orig_off && align_off < prevo)
3169                 align_off = prevo;
3170         /*
3171          * If the next block overlaps with this proposed allocation
3172          * then move the start back without adjusting the length,
3173          * but not before offset 0.
3174          * This may of course make the start overlap previous block,
3175          * and if we hit the offset 0 limit then the next block
3176          * can still overlap too.
3177          */
3178         if (!eof && gotp->br_startoff != NULLFILEOFF) {
3179                 if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
3180                     (!delay && gotp->br_startblock == DELAYSTARTBLOCK))
3181                         nexto = gotp->br_startoff + gotp->br_blockcount;
3182                 else
3183                         nexto = gotp->br_startoff;
3184         } else
3185                 nexto = NULLFILEOFF;
3186         if (!eof &&
3187             align_off + align_alen != orig_end &&
3188             align_off + align_alen > nexto)
3189                 align_off = nexto > align_alen ? nexto - align_alen : 0;
3190         /*
3191          * If we're now overlapping the next or previous extent that
3192          * means we can't fit an extsz piece in this hole.  Just move
3193          * the start forward to the first valid spot and set
3194          * the length so we hit the end.
3195          */
3196         if (align_off != orig_off && align_off < prevo)
3197                 align_off = prevo;
3198         if (align_off + align_alen != orig_end &&
3199             align_off + align_alen > nexto &&
3200             nexto != NULLFILEOFF) {
3201                 ASSERT(nexto > prevo);
3202                 align_alen = nexto - align_off;
3203         }
3204
3205         /*
3206          * If realtime, and the result isn't a multiple of the realtime
3207          * extent size we need to remove blocks until it is.
3208          */
3209         if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
3210                 /*
3211                  * We're not covering the original request, or
3212                  * we won't be able to once we fix the length.
3213                  */
3214                 if (orig_off < align_off ||
3215                     orig_end > align_off + align_alen ||
3216                     align_alen - temp < orig_alen)
3217                         return -EINVAL;
3218                 /*
3219                  * Try to fix it by moving the start up.
3220                  */
3221                 if (align_off + temp <= orig_off) {
3222                         align_alen -= temp;
3223                         align_off += temp;
3224                 }
3225                 /*
3226                  * Try to fix it by moving the end in.
3227                  */
3228                 else if (align_off + align_alen - temp >= orig_end)
3229                         align_alen -= temp;
3230                 /*
3231                  * Set the start to the minimum then trim the length.
3232                  */
3233                 else {
3234                         align_alen -= orig_off - align_off;
3235                         align_off = orig_off;
3236                         align_alen -= align_alen % mp->m_sb.sb_rextsize;
3237                 }
3238                 /*
3239                  * Result doesn't cover the request, fail it.
3240                  */
3241                 if (orig_off < align_off || orig_end > align_off + align_alen)
3242                         return -EINVAL;
3243         } else {
3244                 ASSERT(orig_off >= align_off);
3245                 /* see MAXEXTLEN handling above */
3246                 ASSERT(orig_end <= align_off + align_alen ||
3247                        align_alen + extsz > MAXEXTLEN);
3248         }
3249
3250 #ifdef DEBUG
3251         if (!eof && gotp->br_startoff != NULLFILEOFF)
3252                 ASSERT(align_off + align_alen <= gotp->br_startoff);
3253         if (prevp->br_startoff != NULLFILEOFF)
3254                 ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
3255 #endif
3256
3257         *lenp = align_alen;
3258         *offp = align_off;
3259         return 0;
3260 }
3261
3262 #define XFS_ALLOC_GAP_UNITS     4
3263
3264 void
3265 xfs_bmap_adjacent(
3266         struct xfs_bmalloca     *ap)    /* bmap alloc argument struct */
3267 {
3268         xfs_fsblock_t   adjust;         /* adjustment to block numbers */
3269         xfs_agnumber_t  fb_agno;        /* ag number of ap->firstblock */
3270         xfs_mount_t     *mp;            /* mount point structure */
3271         int             nullfb;         /* true if ap->firstblock isn't set */
3272         int             rt;             /* true if inode is realtime */
3273
3274 #define ISVALID(x,y)    \
3275         (rt ? \
3276                 (x) < mp->m_sb.sb_rblocks : \
3277                 XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
3278                 XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
3279                 XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
3280
3281         mp = ap->ip->i_mount;
3282         nullfb = *ap->firstblock == NULLFSBLOCK;
3283         rt = XFS_IS_REALTIME_INODE(ap->ip) &&
3284                 xfs_alloc_is_userdata(ap->datatype);
3285         fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock);
3286         /*
3287          * If allocating at eof, and there's a previous real block,
3288          * try to use its last block as our starting point.
3289          */
3290         if (ap->eof && ap->prev.br_startoff != NULLFILEOFF &&
3291             !isnullstartblock(ap->prev.br_startblock) &&
3292             ISVALID(ap->prev.br_startblock + ap->prev.br_blockcount,
3293                     ap->prev.br_startblock)) {
3294                 ap->blkno = ap->prev.br_startblock + ap->prev.br_blockcount;
3295                 /*
3296                  * Adjust for the gap between prevp and us.
3297                  */
3298                 adjust = ap->offset -
3299                         (ap->prev.br_startoff + ap->prev.br_blockcount);
3300                 if (adjust &&
3301                     ISVALID(ap->blkno + adjust, ap->prev.br_startblock))
3302                         ap->blkno += adjust;
3303         }
3304         /*
3305          * If not at eof, then compare the two neighbor blocks.
3306          * Figure out whether either one gives us a good starting point,
3307          * and pick the better one.
3308          */
3309         else if (!ap->eof) {
3310                 xfs_fsblock_t   gotbno;         /* right side block number */
3311                 xfs_fsblock_t   gotdiff=0;      /* right side difference */
3312                 xfs_fsblock_t   prevbno;        /* left side block number */
3313                 xfs_fsblock_t   prevdiff=0;     /* left side difference */
3314
3315                 /*
3316                  * If there's a previous (left) block, select a requested
3317                  * start block based on it.
3318                  */
3319                 if (ap->prev.br_startoff != NULLFILEOFF &&
3320                     !isnullstartblock(ap->prev.br_startblock) &&
3321                     (prevbno = ap->prev.br_startblock +
3322                                ap->prev.br_blockcount) &&
3323                     ISVALID(prevbno, ap->prev.br_startblock)) {
3324                         /*
3325                          * Calculate gap to end of previous block.
3326                          */
3327                         adjust = prevdiff = ap->offset -
3328                                 (ap->prev.br_startoff +
3329                                  ap->prev.br_blockcount);
3330                         /*
3331                          * Figure the startblock based on the previous block's
3332                          * end and the gap size.
3333                          * Heuristic!
3334                          * If the gap is large relative to the piece we're
3335                          * allocating, or using it gives us an invalid block
3336                          * number, then just use the end of the previous block.
3337                          */
3338                         if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
3339                             ISVALID(prevbno + prevdiff,
3340                                     ap->prev.br_startblock))
3341                                 prevbno += adjust;
3342                         else
3343                                 prevdiff += adjust;
3344                         /*
3345                          * If the firstblock forbids it, can't use it,
3346                          * must use default.
3347                          */
3348                         if (!rt && !nullfb &&
3349                             XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
3350                                 prevbno = NULLFSBLOCK;
3351                 }
3352                 /*
3353                  * No previous block or can't follow it, just default.
3354                  */
3355                 else
3356                         prevbno = NULLFSBLOCK;
3357                 /*
3358                  * If there's a following (right) block, select a requested
3359                  * start block based on it.
3360                  */
3361                 if (!isnullstartblock(ap->got.br_startblock)) {
3362                         /*
3363                          * Calculate gap to start of next block.
3364                          */
3365                         adjust = gotdiff = ap->got.br_startoff - ap->offset;
3366                         /*
3367                          * Figure the startblock based on the next block's
3368                          * start and the gap size.
3369                          */
3370                         gotbno = ap->got.br_startblock;
3371                         /*
3372                          * Heuristic!
3373                          * If the gap is large relative to the piece we're
3374                          * allocating, or using it gives us an invalid block
3375                          * number, then just use the start of the next block
3376                          * offset by our length.
3377                          */
3378                         if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
3379                             ISVALID(gotbno - gotdiff, gotbno))
3380                                 gotbno -= adjust;
3381                         else if (ISVALID(gotbno - ap->length, gotbno)) {
3382                                 gotbno -= ap->length;
3383                                 gotdiff += adjust - ap->length;
3384                         } else
3385                                 gotdiff += adjust;
3386                         /*
3387                          * If the firstblock forbids it, can't use it,
3388                          * must use default.
3389                          */
3390                         if (!rt && !nullfb &&
3391                             XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
3392                                 gotbno = NULLFSBLOCK;
3393                 }
3394                 /*
3395                  * No next block, just default.
3396                  */
3397                 else
3398                         gotbno = NULLFSBLOCK;
3399                 /*
3400                  * If both valid, pick the better one, else the only good
3401                  * one, else ap->blkno is already set (to 0 or the inode block).
3402                  */
3403                 if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
3404                         ap->blkno = prevdiff <= gotdiff ? prevbno : gotbno;
3405                 else if (prevbno != NULLFSBLOCK)
3406                         ap->blkno = prevbno;
3407                 else if (gotbno != NULLFSBLOCK)
3408                         ap->blkno = gotbno;
3409         }
3410 #undef ISVALID
3411 }
3412
3413 static int
3414 xfs_bmap_longest_free_extent(
3415         struct xfs_trans        *tp,
3416         xfs_agnumber_t          ag,
3417         xfs_extlen_t            *blen,
3418         int                     *notinit)
3419 {
3420         struct xfs_mount        *mp = tp->t_mountp;
3421         struct xfs_perag        *pag;
3422         xfs_extlen_t            longest;
3423         int                     error = 0;
3424
3425         pag = xfs_perag_get(mp, ag);
3426         if (!pag->pagf_init) {
3427                 error = xfs_alloc_pagf_init(mp, tp, ag, XFS_ALLOC_FLAG_TRYLOCK);
3428                 if (error)
3429                         goto out;
3430
3431                 if (!pag->pagf_init) {
3432                         *notinit = 1;
3433                         goto out;
3434                 }
3435         }
3436
3437         longest = xfs_alloc_longest_free_extent(mp, pag,
3438                                 xfs_alloc_min_freelist(mp, pag),
3439                                 xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE));
3440         if (*blen < longest)
3441                 *blen = longest;
3442
3443 out:
3444         xfs_perag_put(pag);
3445         return error;
3446 }
3447
3448 static void
3449 xfs_bmap_select_minlen(
3450         struct xfs_bmalloca     *ap,
3451         struct xfs_alloc_arg    *args,
3452         xfs_extlen_t            *blen,
3453         int                     notinit)
3454 {
3455         if (notinit || *blen < ap->minlen) {
3456                 /*
3457                  * Since we did a BUF_TRYLOCK above, it is possible that
3458                  * there is space for this request.
3459                  */
3460                 args->minlen = ap->minlen;
3461         } else if (*blen < args->maxlen) {
3462                 /*
3463                  * If the best seen length is less than the request length,
3464                  * use the best as the minimum.
3465                  */
3466                 args->minlen = *blen;
3467         } else {
3468                 /*
3469                  * Otherwise we've seen an extent as big as maxlen, use that
3470                  * as the minimum.
3471                  */
3472                 args->minlen = args->maxlen;
3473         }
3474 }
3475
3476 STATIC int
3477 xfs_bmap_btalloc_nullfb(
3478         struct xfs_bmalloca     *ap,
3479         struct xfs_alloc_arg    *args,
3480         xfs_extlen_t            *blen)
3481 {
3482         struct xfs_mount        *mp = ap->ip->i_mount;
3483         xfs_agnumber_t          ag, startag;
3484         int                     notinit = 0;
3485         int                     error;
3486
3487         args->type = XFS_ALLOCTYPE_START_BNO;
3488         args->total = ap->total;
3489
3490         startag = ag = XFS_FSB_TO_AGNO(mp, args->fsbno);
3491         if (startag == NULLAGNUMBER)
3492                 startag = ag = 0;
3493
3494         while (*blen < args->maxlen) {
3495                 error = xfs_bmap_longest_free_extent(args->tp, ag, blen,
3496                                                      &notinit);
3497                 if (error)
3498                         return error;
3499
3500                 if (++ag == mp->m_sb.sb_agcount)
3501                         ag = 0;
3502                 if (ag == startag)
3503                         break;
3504         }
3505
3506         xfs_bmap_select_minlen(ap, args, blen, notinit);
3507         return 0;
3508 }
3509
3510 STATIC int
3511 xfs_bmap_btalloc_filestreams(
3512         struct xfs_bmalloca     *ap,
3513         struct xfs_alloc_arg    *args,
3514         xfs_extlen_t            *blen)
3515 {
3516         struct xfs_mount        *mp = ap->ip->i_mount;
3517         xfs_agnumber_t          ag;
3518         int                     notinit = 0;
3519         int                     error;
3520
3521         args->type = XFS_ALLOCTYPE_NEAR_BNO;
3522         args->total = ap->total;
3523
3524         ag = XFS_FSB_TO_AGNO(mp, args->fsbno);
3525         if (ag == NULLAGNUMBER)
3526                 ag = 0;
3527
3528         error = xfs_bmap_longest_free_extent(args->tp, ag, blen, &notinit);
3529         if (error)
3530                 return error;
3531
3532         if (*blen < args->maxlen) {
3533                 error = xfs_filestream_new_ag(ap, &ag);
3534                 if (error)
3535                         return error;
3536
3537                 error = xfs_bmap_longest_free_extent(args->tp, ag, blen,
3538                                                      &notinit);
3539                 if (error)
3540                         return error;
3541
3542         }
3543
3544         xfs_bmap_select_minlen(ap, args, blen, notinit);
3545
3546         /*
3547          * Set the failure fallback case to look in the selected AG as stream
3548          * may have moved.
3549          */
3550         ap->blkno = args->fsbno = XFS_AGB_TO_FSB(mp, ag, 0);
3551         return 0;
3552 }
3553
3554 STATIC int
3555 xfs_bmap_btalloc(
3556         struct xfs_bmalloca     *ap)    /* bmap alloc argument struct */
3557 {
3558         xfs_mount_t     *mp;            /* mount point structure */
3559         xfs_alloctype_t atype = 0;      /* type for allocation routines */
3560         xfs_extlen_t    align = 0;      /* minimum allocation alignment */
3561         xfs_agnumber_t  fb_agno;        /* ag number of ap->firstblock */
3562         xfs_agnumber_t  ag;
3563         xfs_alloc_arg_t args;
3564         xfs_extlen_t    blen;
3565         xfs_extlen_t    nextminlen = 0;
3566         int             nullfb;         /* true if ap->firstblock isn't set */
3567         int             isaligned;
3568         int             tryagain;
3569         int             error;
3570         int             stripe_align;
3571
3572         ASSERT(ap->length);
3573
3574         mp = ap->ip->i_mount;
3575
3576         /* stripe alignment for allocation is determined by mount parameters */
3577         stripe_align = 0;
3578         if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC))
3579                 stripe_align = mp->m_swidth;
3580         else if (mp->m_dalign)
3581                 stripe_align = mp->m_dalign;
3582
3583         if (ap->flags & XFS_BMAPI_COWFORK)
3584                 align = xfs_get_cowextsz_hint(ap->ip);
3585         else if (xfs_alloc_is_userdata(ap->datatype))
3586                 align = xfs_get_extsz_hint(ap->ip);
3587         if (align) {
3588                 error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
3589                                                 align, 0, ap->eof, 0, ap->conv,
3590                                                 &ap->offset, &ap->length);
3591                 ASSERT(!error);
3592                 ASSERT(ap->length);
3593         }
3594
3595
3596         nullfb = *ap->firstblock == NULLFSBLOCK;
3597         fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock);
3598         if (nullfb) {
3599                 if (xfs_alloc_is_userdata(ap->datatype) &&
3600                     xfs_inode_is_filestream(ap->ip)) {
3601                         ag = xfs_filestream_lookup_ag(ap->ip);
3602                         ag = (ag != NULLAGNUMBER) ? ag : 0;
3603                         ap->blkno = XFS_AGB_TO_FSB(mp, ag, 0);
3604                 } else {
3605                         ap->blkno = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
3606                 }
3607         } else
3608                 ap->blkno = *ap->firstblock;
3609
3610         xfs_bmap_adjacent(ap);
3611
3612         /*
3613          * If allowed, use ap->blkno; otherwise must use firstblock since
3614          * it's in the right allocation group.
3615          */
3616         if (nullfb || XFS_FSB_TO_AGNO(mp, ap->blkno) == fb_agno)
3617                 ;
3618         else
3619                 ap->blkno = *ap->firstblock;
3620         /*
3621          * Normal allocation, done through xfs_alloc_vextent.
3622          */
3623         tryagain = isaligned = 0;
3624         memset(&args, 0, sizeof(args));
3625         args.tp = ap->tp;
3626         args.mp = mp;
3627         args.fsbno = ap->blkno;
3628         xfs_rmap_skip_owner_update(&args.oinfo);
3629
3630         /* Trim the allocation back to the maximum an AG can fit. */
3631         args.maxlen = MIN(ap->length, mp->m_ag_max_usable);
3632         args.firstblock = *ap->firstblock;
3633         blen = 0;
3634         if (nullfb) {
3635                 /*
3636                  * Search for an allocation group with a single extent large
3637                  * enough for the request.  If one isn't found, then adjust
3638                  * the minimum allocation size to the largest space found.
3639                  */
3640                 if (xfs_alloc_is_userdata(ap->datatype) &&
3641                     xfs_inode_is_filestream(ap->ip))
3642                         error = xfs_bmap_btalloc_filestreams(ap, &args, &blen);
3643                 else
3644                         error = xfs_bmap_btalloc_nullfb(ap, &args, &blen);
3645                 if (error)
3646                         return error;
3647         } else if (ap->dfops->dop_low) {
3648                 if (xfs_inode_is_filestream(ap->ip))
3649                         args.type = XFS_ALLOCTYPE_FIRST_AG;
3650                 else
3651                         args.type = XFS_ALLOCTYPE_START_BNO;
3652                 args.total = args.minlen = ap->minlen;
3653         } else {
3654                 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3655                 args.total = ap->total;
3656                 args.minlen = ap->minlen;
3657         }
3658         /* apply extent size hints if obtained earlier */
3659         if (align) {
3660                 args.prod = align;
3661                 if ((args.mod = (xfs_extlen_t)do_mod(ap->offset, args.prod)))
3662                         args.mod = (xfs_extlen_t)(args.prod - args.mod);
3663         } else if (mp->m_sb.sb_blocksize >= PAGE_SIZE) {
3664                 args.prod = 1;
3665                 args.mod = 0;
3666         } else {
3667                 args.prod = PAGE_SIZE >> mp->m_sb.sb_blocklog;
3668                 if ((args.mod = (xfs_extlen_t)(do_mod(ap->offset, args.prod))))
3669                         args.mod = (xfs_extlen_t)(args.prod - args.mod);
3670         }
3671         /*
3672          * If we are not low on available data blocks, and the
3673          * underlying logical volume manager is a stripe, and
3674          * the file offset is zero then try to allocate data
3675          * blocks on stripe unit boundary.
3676          * NOTE: ap->aeof is only set if the allocation length
3677          * is >= the stripe unit and the allocation offset is
3678          * at the end of file.
3679          */
3680         if (!ap->dfops->dop_low && ap->aeof) {
3681                 if (!ap->offset) {
3682                         args.alignment = stripe_align;
3683                         atype = args.type;
3684                         isaligned = 1;
3685                         /*
3686                          * Adjust for alignment
3687                          */
3688                         if (blen > args.alignment && blen <= args.maxlen)
3689                                 args.minlen = blen - args.alignment;
3690                         args.minalignslop = 0;
3691                 } else {
3692                         /*
3693                          * First try an exact bno allocation.
3694                          * If it fails then do a near or start bno
3695                          * allocation with alignment turned on.
3696                          */
3697                         atype = args.type;
3698                         tryagain = 1;
3699                         args.type = XFS_ALLOCTYPE_THIS_BNO;
3700                         args.alignment = 1;
3701                         /*
3702                          * Compute the minlen+alignment for the
3703                          * next case.  Set slop so that the value
3704                          * of minlen+alignment+slop doesn't go up
3705                          * between the calls.
3706                          */
3707                         if (blen > stripe_align && blen <= args.maxlen)
3708                                 nextminlen = blen - stripe_align;
3709                         else
3710                                 nextminlen = args.minlen;
3711                         if (nextminlen + stripe_align > args.minlen + 1)
3712                                 args.minalignslop =
3713                                         nextminlen + stripe_align -
3714                                         args.minlen - 1;
3715                         else
3716                                 args.minalignslop = 0;
3717                 }
3718         } else {
3719                 args.alignment = 1;
3720                 args.minalignslop = 0;
3721         }
3722         args.minleft = ap->minleft;
3723         args.wasdel = ap->wasdel;
3724         args.resv = XFS_AG_RESV_NONE;
3725         args.datatype = ap->datatype;
3726         if (ap->datatype & XFS_ALLOC_USERDATA_ZERO)
3727                 args.ip = ap->ip;
3728
3729         error = xfs_alloc_vextent(&args);
3730         if (error)
3731                 return error;
3732
3733         if (tryagain && args.fsbno == NULLFSBLOCK) {
3734                 /*
3735                  * Exact allocation failed. Now try with alignment
3736                  * turned on.
3737                  */
3738                 args.type = atype;
3739                 args.fsbno = ap->blkno;
3740                 args.alignment = stripe_align;
3741                 args.minlen = nextminlen;
3742                 args.minalignslop = 0;
3743                 isaligned = 1;
3744                 if ((error = xfs_alloc_vextent(&args)))
3745                         return error;
3746         }
3747         if (isaligned && args.fsbno == NULLFSBLOCK) {
3748                 /*
3749                  * allocation failed, so turn off alignment and
3750                  * try again.
3751                  */
3752                 args.type = atype;
3753                 args.fsbno = ap->blkno;
3754                 args.alignment = 0;
3755                 if ((error = xfs_alloc_vextent(&args)))
3756                         return error;
3757         }
3758         if (args.fsbno == NULLFSBLOCK && nullfb &&
3759             args.minlen > ap->minlen) {
3760                 args.minlen = ap->minlen;
3761                 args.type = XFS_ALLOCTYPE_START_BNO;
3762                 args.fsbno = ap->blkno;
3763                 if ((error = xfs_alloc_vextent(&args)))
3764                         return error;
3765         }
3766         if (args.fsbno == NULLFSBLOCK && nullfb) {
3767                 args.fsbno = 0;
3768                 args.type = XFS_ALLOCTYPE_FIRST_AG;
3769                 args.total = ap->minlen;
3770                 if ((error = xfs_alloc_vextent(&args)))
3771                         return error;
3772                 ap->dfops->dop_low = true;
3773         }
3774         if (args.fsbno != NULLFSBLOCK) {
3775                 /*
3776                  * check the allocation happened at the same or higher AG than
3777                  * the first block that was allocated.
3778                  */
3779                 ASSERT(*ap->firstblock == NULLFSBLOCK ||
3780                        XFS_FSB_TO_AGNO(mp, *ap->firstblock) <=
3781                        XFS_FSB_TO_AGNO(mp, args.fsbno));
3782
3783                 ap->blkno = args.fsbno;
3784                 if (*ap->firstblock == NULLFSBLOCK)
3785                         *ap->firstblock = args.fsbno;
3786                 ASSERT(nullfb || fb_agno <= args.agno);
3787                 ap->length = args.len;
3788                 if (!(ap->flags & XFS_BMAPI_COWFORK))
3789                         ap->ip->i_d.di_nblocks += args.len;
3790                 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
3791                 if (ap->wasdel)
3792                         ap->ip->i_delayed_blks -= args.len;
3793                 /*
3794                  * Adjust the disk quota also. This was reserved
3795                  * earlier.
3796                  */
3797                 xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
3798                         ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
3799                                         XFS_TRANS_DQ_BCOUNT,
3800                         (long) args.len);
3801         } else {
3802                 ap->blkno = NULLFSBLOCK;
3803                 ap->length = 0;
3804         }
3805         return 0;
3806 }
3807
3808 /*
3809  * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
3810  * It figures out where to ask the underlying allocator to put the new extent.
3811  */
3812 STATIC int
3813 xfs_bmap_alloc(
3814         struct xfs_bmalloca     *ap)    /* bmap alloc argument struct */
3815 {
3816         if (XFS_IS_REALTIME_INODE(ap->ip) &&
3817             xfs_alloc_is_userdata(ap->datatype))
3818                 return xfs_bmap_rtalloc(ap);
3819         return xfs_bmap_btalloc(ap);
3820 }
3821
3822 /* Trim extent to fit a logical block range. */
3823 void
3824 xfs_trim_extent(
3825         struct xfs_bmbt_irec    *irec,
3826         xfs_fileoff_t           bno,
3827         xfs_filblks_t           len)
3828 {
3829         xfs_fileoff_t           distance;
3830         xfs_fileoff_t           end = bno + len;
3831
3832         if (irec->br_startoff + irec->br_blockcount <= bno ||
3833             irec->br_startoff >= end) {
3834                 irec->br_blockcount = 0;
3835                 return;
3836         }
3837
3838         if (irec->br_startoff < bno) {
3839                 distance = bno - irec->br_startoff;
3840                 if (isnullstartblock(irec->br_startblock))
3841                         irec->br_startblock = DELAYSTARTBLOCK;
3842                 if (irec->br_startblock != DELAYSTARTBLOCK &&
3843                     irec->br_startblock != HOLESTARTBLOCK)
3844                         irec->br_startblock += distance;
3845                 irec->br_startoff += distance;
3846                 irec->br_blockcount -= distance;
3847         }
3848
3849         if (end < irec->br_startoff + irec->br_blockcount) {
3850                 distance = irec->br_startoff + irec->br_blockcount - end;
3851                 irec->br_blockcount -= distance;
3852         }
3853 }
3854
3855 /*
3856  * Trim the returned map to the required bounds
3857  */
3858 STATIC void
3859 xfs_bmapi_trim_map(
3860         struct xfs_bmbt_irec    *mval,
3861         struct xfs_bmbt_irec    *got,
3862         xfs_fileoff_t           *bno,
3863         xfs_filblks_t           len,
3864         xfs_fileoff_t           obno,
3865         xfs_fileoff_t           end,
3866         int                     n,
3867         int                     flags)
3868 {
3869         if ((flags & XFS_BMAPI_ENTIRE) ||
3870             got->br_startoff + got->br_blockcount <= obno) {
3871                 *mval = *got;
3872                 if (isnullstartblock(got->br_startblock))
3873                         mval->br_startblock = DELAYSTARTBLOCK;
3874                 return;
3875         }
3876
3877         if (obno > *bno)
3878                 *bno = obno;
3879         ASSERT((*bno >= obno) || (n == 0));
3880         ASSERT(*bno < end);
3881         mval->br_startoff = *bno;
3882         if (isnullstartblock(got->br_startblock))
3883                 mval->br_startblock = DELAYSTARTBLOCK;
3884         else
3885                 mval->br_startblock = got->br_startblock +
3886                                         (*bno - got->br_startoff);
3887         /*
3888          * Return the minimum of what we got and what we asked for for
3889          * the length.  We can use the len variable here because it is
3890          * modified below and we could have been there before coming
3891          * here if the first part of the allocation didn't overlap what
3892          * was asked for.
3893          */
3894         mval->br_blockcount = XFS_FILBLKS_MIN(end - *bno,
3895                         got->br_blockcount - (*bno - got->br_startoff));
3896         mval->br_state = got->br_state;
3897         ASSERT(mval->br_blockcount <= len);
3898         return;
3899 }
3900
3901 /*
3902  * Update and validate the extent map to return
3903  */
3904 STATIC void
3905 xfs_bmapi_update_map(
3906         struct xfs_bmbt_irec    **map,
3907         xfs_fileoff_t           *bno,
3908         xfs_filblks_t           *len,
3909         xfs_fileoff_t           obno,
3910         xfs_fileoff_t           end,
3911         int                     *n,
3912         int                     flags)
3913 {
3914         xfs_bmbt_irec_t *mval = *map;
3915
3916         ASSERT((flags & XFS_BMAPI_ENTIRE) ||
3917                ((mval->br_startoff + mval->br_blockcount) <= end));
3918         ASSERT((flags & XFS_BMAPI_ENTIRE) || (mval->br_blockcount <= *len) ||
3919                (mval->br_startoff < obno));
3920
3921         *bno = mval->br_startoff + mval->br_blockcount;
3922         *len = end - *bno;
3923         if (*n > 0 && mval->br_startoff == mval[-1].br_startoff) {
3924                 /* update previous map with new information */
3925                 ASSERT(mval->br_startblock == mval[-1].br_startblock);
3926                 ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
3927                 ASSERT(mval->br_state == mval[-1].br_state);
3928                 mval[-1].br_blockcount = mval->br_blockcount;
3929                 mval[-1].br_state = mval->br_state;
3930         } else if (*n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
3931                    mval[-1].br_startblock != DELAYSTARTBLOCK &&
3932                    mval[-1].br_startblock != HOLESTARTBLOCK &&
3933                    mval->br_startblock == mval[-1].br_startblock +
3934                                           mval[-1].br_blockcount &&
3935                    ((flags & XFS_BMAPI_IGSTATE) ||
3936                         mval[-1].br_state == mval->br_state)) {
3937                 ASSERT(mval->br_startoff ==
3938                        mval[-1].br_startoff + mval[-1].br_blockcount);
3939                 mval[-1].br_blockcount += mval->br_blockcount;
3940         } else if (*n > 0 &&
3941                    mval->br_startblock == DELAYSTARTBLOCK &&
3942                    mval[-1].br_startblock == DELAYSTARTBLOCK &&
3943                    mval->br_startoff ==
3944                    mval[-1].br_startoff + mval[-1].br_blockcount) {
3945                 mval[-1].br_blockcount += mval->br_blockcount;
3946                 mval[-1].br_state = mval->br_state;
3947         } else if (!((*n == 0) &&
3948                      ((mval->br_startoff + mval->br_blockcount) <=
3949                       obno))) {
3950                 mval++;
3951                 (*n)++;
3952         }
3953         *map = mval;
3954 }
3955
3956 /*
3957  * Map file blocks to filesystem blocks without allocation.
3958  */
3959 int
3960 xfs_bmapi_read(
3961         struct xfs_inode        *ip,
3962         xfs_fileoff_t           bno,
3963         xfs_filblks_t           len,
3964         struct xfs_bmbt_irec    *mval,
3965         int                     *nmap,
3966         int                     flags)
3967 {
3968         struct xfs_mount        *mp = ip->i_mount;
3969         struct xfs_ifork        *ifp;
3970         struct xfs_bmbt_irec    got;
3971         xfs_fileoff_t           obno;
3972         xfs_fileoff_t           end;
3973         xfs_extnum_t            idx;
3974         int                     error;
3975         bool                    eof = false;
3976         int                     n = 0;
3977         int                     whichfork = xfs_bmapi_whichfork(flags);
3978
3979         ASSERT(*nmap >= 1);
3980         ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK|XFS_BMAPI_ENTIRE|
3981                            XFS_BMAPI_IGSTATE|XFS_BMAPI_COWFORK)));
3982         ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED|XFS_ILOCK_EXCL));
3983
3984         if (unlikely(XFS_TEST_ERROR(
3985             (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
3986              XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
3987              mp, XFS_ERRTAG_BMAPIFORMAT))) {
3988                 XFS_ERROR_REPORT("xfs_bmapi_read", XFS_ERRLEVEL_LOW, mp);
3989                 return -EFSCORRUPTED;
3990         }
3991
3992         if (XFS_FORCED_SHUTDOWN(mp))
3993                 return -EIO;
3994
3995         XFS_STATS_INC(mp, xs_blk_mapr);
3996
3997         ifp = XFS_IFORK_PTR(ip, whichfork);
3998
3999         /* No CoW fork?  Return a hole. */
4000         if (whichfork == XFS_COW_FORK && !ifp) {
4001                 mval->br_startoff = bno;
4002                 mval->br_startblock = HOLESTARTBLOCK;
4003                 mval->br_blockcount = len;
4004                 mval->br_state = XFS_EXT_NORM;
4005                 *nmap = 1;
4006                 return 0;
4007         }
4008
4009         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
4010                 error = xfs_iread_extents(NULL, ip, whichfork);
4011                 if (error)
4012                         return error;
4013         }
4014
4015         if (!xfs_iext_lookup_extent(ip, ifp, bno, &idx, &got))
4016                 eof = true;
4017         end = bno + len;
4018         obno = bno;
4019
4020         while (bno < end && n < *nmap) {
4021                 /* Reading past eof, act as though there's a hole up to end. */
4022                 if (eof)
4023                         got.br_startoff = end;
4024                 if (got.br_startoff > bno) {
4025                         /* Reading in a hole.  */
4026                         mval->br_startoff = bno;
4027                         mval->br_startblock = HOLESTARTBLOCK;
4028                         mval->br_blockcount =
4029                                 XFS_FILBLKS_MIN(len, got.br_startoff - bno);
4030                         mval->br_state = XFS_EXT_NORM;
4031                         bno += mval->br_blockcount;
4032                         len -= mval->br_blockcount;
4033                         mval++;
4034                         n++;
4035                         continue;
4036                 }
4037
4038                 /* set up the extent map to return. */
4039                 xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
4040                 xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
4041
4042                 /* If we're done, stop now. */
4043                 if (bno >= end || n >= *nmap)
4044                         break;
4045
4046                 /* Else go on to the next record. */
4047                 if (!xfs_iext_get_extent(ifp, ++idx, &got))
4048                         eof = true;
4049         }
4050         *nmap = n;
4051         return 0;
4052 }
4053
4054 /*
4055  * Add a delayed allocation extent to an inode. Blocks are reserved from the
4056  * global pool and the extent inserted into the inode in-core extent tree.
4057  *
4058  * On entry, got refers to the first extent beyond the offset of the extent to
4059  * allocate or eof is specified if no such extent exists. On return, got refers
4060  * to the extent record that was inserted to the inode fork.
4061  *
4062  * Note that the allocated extent may have been merged with contiguous extents
4063  * during insertion into the inode fork. Thus, got does not reflect the current
4064  * state of the inode fork on return. If necessary, the caller can use lastx to
4065  * look up the updated record in the inode fork.
4066  */
4067 int
4068 xfs_bmapi_reserve_delalloc(
4069         struct xfs_inode        *ip,
4070         int                     whichfork,
4071         xfs_fileoff_t           off,
4072         xfs_filblks_t           len,
4073         xfs_filblks_t           prealloc,
4074         struct xfs_bmbt_irec    *got,
4075         xfs_extnum_t            *lastx,
4076         int                     eof)
4077 {
4078         struct xfs_mount        *mp = ip->i_mount;
4079         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
4080         xfs_extlen_t            alen;
4081         xfs_extlen_t            indlen;
4082         char                    rt = XFS_IS_REALTIME_INODE(ip);
4083         xfs_extlen_t            extsz;
4084         int                     error;
4085         xfs_fileoff_t           aoff = off;
4086
4087         /*
4088          * Cap the alloc length. Keep track of prealloc so we know whether to
4089          * tag the inode before we return.
4090          */
4091         alen = XFS_FILBLKS_MIN(len + prealloc, MAXEXTLEN);
4092         if (!eof)
4093                 alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff);
4094         if (prealloc && alen >= len)
4095                 prealloc = alen - len;
4096
4097         /* Figure out the extent size, adjust alen */
4098         if (whichfork == XFS_COW_FORK)
4099                 extsz = xfs_get_cowextsz_hint(ip);
4100         else
4101                 extsz = xfs_get_extsz_hint(ip);
4102         if (extsz) {
4103                 struct xfs_bmbt_irec    prev;
4104
4105                 if (!xfs_iext_get_extent(ifp, *lastx - 1, &prev))
4106                         prev.br_startoff = NULLFILEOFF;
4107
4108                 error = xfs_bmap_extsize_align(mp, got, &prev, extsz, rt, eof,
4109                                                1, 0, &aoff, &alen);
4110                 ASSERT(!error);
4111         }
4112
4113         if (rt)
4114                 extsz = alen / mp->m_sb.sb_rextsize;
4115
4116         /*
4117          * Make a transaction-less quota reservation for delayed allocation
4118          * blocks.  This number gets adjusted later.  We return if we haven't
4119          * allocated blocks already inside this loop.
4120          */
4121         error = xfs_trans_reserve_quota_nblks(NULL, ip, (long)alen, 0,
4122                         rt ? XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
4123         if (error)
4124                 return error;
4125
4126         /*
4127          * Split changing sb for alen and indlen since they could be coming
4128          * from different places.
4129          */
4130         indlen = (xfs_extlen_t)xfs_bmap_worst_indlen(ip, alen);
4131         ASSERT(indlen > 0);
4132
4133         if (rt) {
4134                 error = xfs_mod_frextents(mp, -((int64_t)extsz));
4135         } else {
4136                 error = xfs_mod_fdblocks(mp, -((int64_t)alen), false);
4137         }
4138
4139         if (error)
4140                 goto out_unreserve_quota;
4141
4142         error = xfs_mod_fdblocks(mp, -((int64_t)indlen), false);
4143         if (error)
4144                 goto out_unreserve_blocks;
4145
4146
4147         ip->i_delayed_blks += alen;
4148
4149         got->br_startoff = aoff;
4150         got->br_startblock = nullstartblock(indlen);
4151         got->br_blockcount = alen;
4152         got->br_state = XFS_EXT_NORM;
4153
4154         xfs_bmap_add_extent_hole_delay(ip, whichfork, lastx, got);
4155
4156         /*
4157          * Tag the inode if blocks were preallocated. Note that COW fork
4158          * preallocation can occur at the start or end of the extent, even when
4159          * prealloc == 0, so we must also check the aligned offset and length.
4160          */
4161         if (whichfork == XFS_DATA_FORK && prealloc)
4162                 xfs_inode_set_eofblocks_tag(ip);
4163         if (whichfork == XFS_COW_FORK && (prealloc || aoff < off || alen > len))
4164                 xfs_inode_set_cowblocks_tag(ip);
4165
4166         return 0;
4167
4168 out_unreserve_blocks:
4169         if (rt)
4170                 xfs_mod_frextents(mp, extsz);
4171         else
4172                 xfs_mod_fdblocks(mp, alen, false);
4173 out_unreserve_quota:
4174         if (XFS_IS_QUOTA_ON(mp))
4175                 xfs_trans_unreserve_quota_nblks(NULL, ip, (long)alen, 0, rt ?
4176                                 XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
4177         return error;
4178 }
4179
4180 static int
4181 xfs_bmapi_allocate(
4182         struct xfs_bmalloca     *bma)
4183 {
4184         struct xfs_mount        *mp = bma->ip->i_mount;
4185         int                     whichfork = xfs_bmapi_whichfork(bma->flags);
4186         struct xfs_ifork        *ifp = XFS_IFORK_PTR(bma->ip, whichfork);
4187         int                     tmp_logflags = 0;
4188         int                     error;
4189
4190         ASSERT(bma->length > 0);
4191
4192         /*
4193          * For the wasdelay case, we could also just allocate the stuff asked
4194          * for in this bmap call but that wouldn't be as good.
4195          */
4196         if (bma->wasdel) {
4197                 bma->length = (xfs_extlen_t)bma->got.br_blockcount;
4198                 bma->offset = bma->got.br_startoff;
4199                 if (bma->idx) {
4200                         xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1),
4201                                          &bma->prev);
4202                 }
4203         } else {
4204                 bma->length = XFS_FILBLKS_MIN(bma->length, MAXEXTLEN);
4205                 if (!bma->eof)
4206                         bma->length = XFS_FILBLKS_MIN(bma->length,
4207                                         bma->got.br_startoff - bma->offset);
4208         }
4209
4210         /*
4211          * Set the data type being allocated. For the data fork, the first data
4212          * in the file is treated differently to all other allocations. For the
4213          * attribute fork, we only need to ensure the allocated range is not on
4214          * the busy list.
4215          */
4216         if (!(bma->flags & XFS_BMAPI_METADATA)) {
4217                 bma->datatype = XFS_ALLOC_NOBUSY;
4218                 if (whichfork == XFS_DATA_FORK) {
4219                         if (bma->offset == 0)
4220                                 bma->datatype |= XFS_ALLOC_INITIAL_USER_DATA;
4221                         else
4222                                 bma->datatype |= XFS_ALLOC_USERDATA;
4223                 }
4224                 if (bma->flags & XFS_BMAPI_ZERO)
4225                         bma->datatype |= XFS_ALLOC_USERDATA_ZERO;
4226         }
4227
4228         bma->minlen = (bma->flags & XFS_BMAPI_CONTIG) ? bma->length : 1;
4229
4230         /*
4231          * Only want to do the alignment at the eof if it is userdata and
4232          * allocation length is larger than a stripe unit.
4233          */
4234         if (mp->m_dalign && bma->length >= mp->m_dalign &&
4235             !(bma->flags & XFS_BMAPI_METADATA) && whichfork == XFS_DATA_FORK) {
4236                 error = xfs_bmap_isaeof(bma, whichfork);
4237                 if (error)
4238                         return error;
4239         }
4240
4241         error = xfs_bmap_alloc(bma);
4242         if (error)
4243                 return error;
4244
4245         if (bma->cur)
4246                 bma->cur->bc_private.b.firstblock = *bma->firstblock;
4247         if (bma->blkno == NULLFSBLOCK)
4248                 return 0;
4249         if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) {
4250                 bma->cur = xfs_bmbt_init_cursor(mp, bma->tp, bma->ip, whichfork);
4251                 bma->cur->bc_private.b.firstblock = *bma->firstblock;
4252                 bma->cur->bc_private.b.dfops = bma->dfops;
4253         }
4254         /*
4255          * Bump the number of extents we've allocated
4256          * in this call.
4257          */
4258         bma->nallocs++;
4259
4260         if (bma->cur)
4261                 bma->cur->bc_private.b.flags =
4262                         bma->wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
4263
4264         bma->got.br_startoff = bma->offset;
4265         bma->got.br_startblock = bma->blkno;
4266         bma->got.br_blockcount = bma->length;
4267         bma->got.br_state = XFS_EXT_NORM;
4268
4269         /*
4270          * In the data fork, a wasdelay extent has been initialized, so
4271          * shouldn't be flagged as unwritten.
4272          *
4273          * For the cow fork, however, we convert delalloc reservations
4274          * (extents allocated for speculative preallocation) to
4275          * allocated unwritten extents, and only convert the unwritten
4276          * extents to real extents when we're about to write the data.
4277          */
4278         if ((!bma->wasdel || (bma->flags & XFS_BMAPI_COWFORK)) &&
4279             (bma->flags & XFS_BMAPI_PREALLOC) &&
4280             xfs_sb_version_hasextflgbit(&mp->m_sb))
4281                 bma->got.br_state = XFS_EXT_UNWRITTEN;
4282
4283         if (bma->wasdel)
4284                 error = xfs_bmap_add_extent_delay_real(bma, whichfork);
4285         else
4286                 error = xfs_bmap_add_extent_hole_real(bma->tp, bma->ip,
4287                                 whichfork, &bma->idx, &bma->cur, &bma->got,
4288                                 bma->firstblock, bma->dfops, &bma->logflags);
4289
4290         bma->logflags |= tmp_logflags;
4291         if (error)
4292                 return error;
4293
4294         /*
4295          * Update our extent pointer, given that xfs_bmap_add_extent_delay_real
4296          * or xfs_bmap_add_extent_hole_real might have merged it into one of
4297          * the neighbouring ones.
4298          */
4299         xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &bma->got);
4300
4301         ASSERT(bma->got.br_startoff <= bma->offset);
4302         ASSERT(bma->got.br_startoff + bma->got.br_blockcount >=
4303                bma->offset + bma->length);
4304         ASSERT(bma->got.br_state == XFS_EXT_NORM ||
4305                bma->got.br_state == XFS_EXT_UNWRITTEN);
4306         return 0;
4307 }
4308
4309 STATIC int
4310 xfs_bmapi_convert_unwritten(
4311         struct xfs_bmalloca     *bma,
4312         struct xfs_bmbt_irec    *mval,
4313         xfs_filblks_t           len,
4314         int                     flags)
4315 {
4316         int                     whichfork = xfs_bmapi_whichfork(flags);
4317         struct xfs_ifork        *ifp = XFS_IFORK_PTR(bma->ip, whichfork);
4318         int                     tmp_logflags = 0;
4319         int                     error;
4320
4321         /* check if we need to do unwritten->real conversion */
4322         if (mval->br_state == XFS_EXT_UNWRITTEN &&
4323             (flags & XFS_BMAPI_PREALLOC))
4324                 return 0;
4325
4326         /* check if we need to do real->unwritten conversion */
4327         if (mval->br_state == XFS_EXT_NORM &&
4328             (flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT)) !=
4329                         (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT))
4330                 return 0;
4331
4332         /*
4333          * Modify (by adding) the state flag, if writing.
4334          */
4335         ASSERT(mval->br_blockcount <= len);
4336         if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) {
4337                 bma->cur = xfs_bmbt_init_cursor(bma->ip->i_mount, bma->tp,
4338                                         bma->ip, whichfork);
4339                 bma->cur->bc_private.b.firstblock = *bma->firstblock;
4340                 bma->cur->bc_private.b.dfops = bma->dfops;
4341         }
4342         mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN)
4343                                 ? XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
4344
4345         /*
4346          * Before insertion into the bmbt, zero the range being converted
4347          * if required.
4348          */
4349         if (flags & XFS_BMAPI_ZERO) {
4350                 error = xfs_zero_extent(bma->ip, mval->br_startblock,
4351                                         mval->br_blockcount);
4352                 if (error)
4353                         return error;
4354         }
4355
4356         error = xfs_bmap_add_extent_unwritten_real(bma->tp, bma->ip, whichfork,
4357                         &bma->idx, &bma->cur, mval, bma->firstblock, bma->dfops,
4358                         &tmp_logflags);
4359         /*
4360          * Log the inode core unconditionally in the unwritten extent conversion
4361          * path because the conversion might not have done so (e.g., if the
4362          * extent count hasn't changed). We need to make sure the inode is dirty
4363          * in the transaction for the sake of fsync(), even if nothing has
4364          * changed, because fsync() will not force the log for this transaction
4365          * unless it sees the inode pinned.
4366          *
4367          * Note: If we're only converting cow fork extents, there aren't
4368          * any on-disk updates to make, so we don't need to log anything.
4369          */
4370         if (whichfork != XFS_COW_FORK)
4371                 bma->logflags |= tmp_logflags | XFS_ILOG_CORE;
4372         if (error)
4373                 return error;
4374
4375         /*
4376          * Update our extent pointer, given that
4377          * xfs_bmap_add_extent_unwritten_real might have merged it into one
4378          * of the neighbouring ones.
4379          */
4380         xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &bma->got);
4381
4382         /*
4383          * We may have combined previously unwritten space with written space,
4384          * so generate another request.
4385          */
4386         if (mval->br_blockcount < len)
4387                 return -EAGAIN;
4388         return 0;
4389 }
4390
4391 /*
4392  * Map file blocks to filesystem blocks, and allocate blocks or convert the
4393  * extent state if necessary.  Details behaviour is controlled by the flags
4394  * parameter.  Only allocates blocks from a single allocation group, to avoid
4395  * locking problems.
4396  *
4397  * The returned value in "firstblock" from the first call in a transaction
4398  * must be remembered and presented to subsequent calls in "firstblock".
4399  * An upper bound for the number of blocks to be allocated is supplied to
4400  * the first call in "total"; if no allocation group has that many free
4401  * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
4402  */
4403 int
4404 xfs_bmapi_write(
4405         struct xfs_trans        *tp,            /* transaction pointer */
4406         struct xfs_inode        *ip,            /* incore inode */
4407         xfs_fileoff_t           bno,            /* starting file offs. mapped */
4408         xfs_filblks_t           len,            /* length to map in file */
4409         int                     flags,          /* XFS_BMAPI_... */
4410         xfs_fsblock_t           *firstblock,    /* first allocated block
4411                                                    controls a.g. for allocs */
4412         xfs_extlen_t            total,          /* total blocks needed */
4413         struct xfs_bmbt_irec    *mval,          /* output: map values */
4414         int                     *nmap,          /* i/o: mval size/count */
4415         struct xfs_defer_ops    *dfops)         /* i/o: list extents to free */
4416 {
4417         struct xfs_mount        *mp = ip->i_mount;
4418         struct xfs_ifork        *ifp;
4419         struct xfs_bmalloca     bma = { NULL }; /* args for xfs_bmap_alloc */
4420         xfs_fileoff_t           end;            /* end of mapped file region */
4421         bool                    eof = false;    /* after the end of extents */
4422         int                     error;          /* error return */
4423         int                     n;              /* current extent index */
4424         xfs_fileoff_t           obno;           /* old block number (offset) */
4425         int                     whichfork;      /* data or attr fork */
4426
4427 #ifdef DEBUG
4428         xfs_fileoff_t           orig_bno;       /* original block number value */
4429         int                     orig_flags;     /* original flags arg value */
4430         xfs_filblks_t           orig_len;       /* original value of len arg */
4431         struct xfs_bmbt_irec    *orig_mval;     /* original value of mval */
4432         int                     orig_nmap;      /* original value of *nmap */
4433
4434         orig_bno = bno;
4435         orig_len = len;
4436         orig_flags = flags;
4437         orig_mval = mval;
4438         orig_nmap = *nmap;
4439 #endif
4440         whichfork = xfs_bmapi_whichfork(flags);
4441
4442         ASSERT(*nmap >= 1);
4443         ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
4444         ASSERT(!(flags & XFS_BMAPI_IGSTATE));
4445         ASSERT(tp != NULL ||
4446                (flags & (XFS_BMAPI_CONVERT | XFS_BMAPI_COWFORK)) ==
4447                         (XFS_BMAPI_CONVERT | XFS_BMAPI_COWFORK));
4448         ASSERT(len > 0);
4449         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL);
4450         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
4451         ASSERT(!(flags & XFS_BMAPI_REMAP));
4452
4453         /* zeroing is for currently only for data extents, not metadata */
4454         ASSERT((flags & (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO)) !=
4455                         (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO));
4456         /*
4457          * we can allocate unwritten extents or pre-zero allocated blocks,
4458          * but it makes no sense to do both at once. This would result in
4459          * zeroing the unwritten extent twice, but it still being an
4460          * unwritten extent....
4461          */
4462         ASSERT((flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO)) !=
4463                         (XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO));
4464
4465         if (unlikely(XFS_TEST_ERROR(
4466             (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4467              XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
4468              mp, XFS_ERRTAG_BMAPIFORMAT))) {
4469                 XFS_ERROR_REPORT("xfs_bmapi_write", XFS_ERRLEVEL_LOW, mp);
4470                 return -EFSCORRUPTED;
4471         }
4472
4473         if (XFS_FORCED_SHUTDOWN(mp))
4474                 return -EIO;
4475
4476         ifp = XFS_IFORK_PTR(ip, whichfork);
4477
4478         XFS_STATS_INC(mp, xs_blk_mapw);
4479
4480         if (*firstblock == NULLFSBLOCK) {
4481                 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
4482                         bma.minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1;
4483                 else
4484                         bma.minleft = 1;
4485         } else {
4486                 bma.minleft = 0;
4487         }
4488
4489         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
4490                 error = xfs_iread_extents(tp, ip, whichfork);
4491                 if (error)
4492                         goto error0;
4493         }
4494
4495         n = 0;
4496         end = bno + len;
4497         obno = bno;
4498
4499         if (!xfs_iext_lookup_extent(ip, ifp, bno, &bma.idx, &bma.got))
4500                 eof = true;
4501         if (!xfs_iext_get_extent(ifp, bma.idx - 1, &bma.prev))
4502                 bma.prev.br_startoff = NULLFILEOFF;
4503         bma.tp = tp;
4504         bma.ip = ip;
4505         bma.total = total;
4506         bma.datatype = 0;
4507         bma.dfops = dfops;
4508         bma.firstblock = firstblock;
4509
4510         while (bno < end && n < *nmap) {
4511                 bool                    need_alloc = false, wasdelay = false;
4512
4513                 /* in hole or beyoned EOF? */
4514                 if (eof || bma.got.br_startoff > bno) {
4515                         if (flags & XFS_BMAPI_DELALLOC) {
4516                                 /*
4517                                  * For the COW fork we can reasonably get a
4518                                  * request for converting an extent that races
4519                                  * with other threads already having converted
4520                                  * part of it, as there converting COW to
4521                                  * regular blocks is not protected using the
4522                                  * IOLOCK.
4523                                  */
4524                                 ASSERT(flags & XFS_BMAPI_COWFORK);
4525                                 if (!(flags & XFS_BMAPI_COWFORK)) {
4526                                         error = -EIO;
4527                                         goto error0;
4528                                 }
4529
4530                                 if (eof || bno >= end)
4531                                         break;
4532                         } else {
4533                                 need_alloc = true;
4534                         }
4535                 } else if (isnullstartblock(bma.got.br_startblock)) {
4536                         wasdelay = true;
4537                 }
4538
4539                 /*
4540                  * First, deal with the hole before the allocated space
4541                  * that we found, if any.
4542                  */
4543                 if (need_alloc || wasdelay) {
4544                         bma.eof = eof;
4545                         bma.conv = !!(flags & XFS_BMAPI_CONVERT);
4546                         bma.wasdel = wasdelay;
4547                         bma.offset = bno;
4548                         bma.flags = flags;
4549
4550                         /*
4551                          * There's a 32/64 bit type mismatch between the
4552                          * allocation length request (which can be 64 bits in
4553                          * length) and the bma length request, which is
4554                          * xfs_extlen_t and therefore 32 bits. Hence we have to
4555                          * check for 32-bit overflows and handle them here.
4556                          */
4557                         if (len > (xfs_filblks_t)MAXEXTLEN)
4558                                 bma.length = MAXEXTLEN;
4559                         else
4560                                 bma.length = len;
4561
4562                         ASSERT(len > 0);
4563                         ASSERT(bma.length > 0);
4564                         error = xfs_bmapi_allocate(&bma);
4565                         if (error)
4566                                 goto error0;
4567                         if (bma.blkno == NULLFSBLOCK)
4568                                 break;
4569
4570                         /*
4571                          * If this is a CoW allocation, record the data in
4572                          * the refcount btree for orphan recovery.
4573                          */
4574                         if (whichfork == XFS_COW_FORK) {
4575                                 error = xfs_refcount_alloc_cow_extent(mp, dfops,
4576                                                 bma.blkno, bma.length);
4577                                 if (error)
4578                                         goto error0;
4579                         }
4580                 }
4581
4582                 /* Deal with the allocated space we found.  */
4583                 xfs_bmapi_trim_map(mval, &bma.got, &bno, len, obno,
4584                                                         end, n, flags);
4585
4586                 /* Execute unwritten extent conversion if necessary */
4587                 error = xfs_bmapi_convert_unwritten(&bma, mval, len, flags);
4588                 if (error == -EAGAIN)
4589                         continue;
4590                 if (error)
4591                         goto error0;
4592
4593                 /* update the extent map to return */
4594                 xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
4595
4596                 /*
4597                  * If we're done, stop now.  Stop when we've allocated
4598                  * XFS_BMAP_MAX_NMAP extents no matter what.  Otherwise
4599                  * the transaction may get too big.
4600                  */
4601                 if (bno >= end || n >= *nmap || bma.nallocs >= *nmap)
4602                         break;
4603
4604                 /* Else go on to the next record. */
4605                 bma.prev = bma.got;
4606                 if (!xfs_iext_get_extent(ifp, ++bma.idx, &bma.got))
4607                         eof = true;
4608         }
4609         *nmap = n;
4610
4611         /*
4612          * Transform from btree to extents, give it cur.
4613          */
4614         if (xfs_bmap_wants_extents(ip, whichfork)) {
4615                 int             tmp_logflags = 0;
4616
4617                 ASSERT(bma.cur);
4618                 error = xfs_bmap_btree_to_extents(tp, ip, bma.cur,
4619                         &tmp_logflags, whichfork);
4620                 bma.logflags |= tmp_logflags;
4621                 if (error)
4622                         goto error0;
4623         }
4624
4625         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
4626                XFS_IFORK_NEXTENTS(ip, whichfork) >
4627                 XFS_IFORK_MAXEXT(ip, whichfork));
4628         error = 0;
4629 error0:
4630         /*
4631          * Log everything.  Do this after conversion, there's no point in
4632          * logging the extent records if we've converted to btree format.
4633          */
4634         if ((bma.logflags & xfs_ilog_fext(whichfork)) &&
4635             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
4636                 bma.logflags &= ~xfs_ilog_fext(whichfork);
4637         else if ((bma.logflags & xfs_ilog_fbroot(whichfork)) &&
4638                  XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
4639                 bma.logflags &= ~xfs_ilog_fbroot(whichfork);
4640         /*
4641          * Log whatever the flags say, even if error.  Otherwise we might miss
4642          * detecting a case where the data is changed, there's an error,
4643          * and it's not logged so we don't shutdown when we should.
4644          */
4645         if (bma.logflags)
4646                 xfs_trans_log_inode(tp, ip, bma.logflags);
4647
4648         if (bma.cur) {
4649                 if (!error) {
4650                         ASSERT(*firstblock == NULLFSBLOCK ||
4651                                XFS_FSB_TO_AGNO(mp, *firstblock) <=
4652                                XFS_FSB_TO_AGNO(mp,
4653                                        bma.cur->bc_private.b.firstblock));
4654                         *firstblock = bma.cur->bc_private.b.firstblock;
4655                 }
4656                 xfs_btree_del_cursor(bma.cur,
4657                         error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
4658         }
4659         if (!error)
4660                 xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
4661                         orig_nmap, *nmap);
4662         return error;
4663 }
4664
4665 static int
4666 xfs_bmapi_remap(
4667         struct xfs_trans        *tp,
4668         struct xfs_inode        *ip,
4669         xfs_fileoff_t           bno,
4670         xfs_filblks_t           len,
4671         xfs_fsblock_t           startblock,
4672         struct xfs_defer_ops    *dfops)
4673 {
4674         struct xfs_mount        *mp = ip->i_mount;
4675         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
4676         struct xfs_btree_cur    *cur = NULL;
4677         xfs_fsblock_t           firstblock = NULLFSBLOCK;
4678         struct xfs_bmbt_irec    got;
4679         xfs_extnum_t            idx;
4680         int                     logflags = 0, error;
4681
4682         ASSERT(len > 0);
4683         ASSERT(len <= (xfs_filblks_t)MAXEXTLEN);
4684         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
4685
4686         if (unlikely(XFS_TEST_ERROR(
4687             (XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_EXTENTS &&
4688              XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_BTREE),
4689              mp, XFS_ERRTAG_BMAPIFORMAT))) {
4690                 XFS_ERROR_REPORT("xfs_bmapi_remap", XFS_ERRLEVEL_LOW, mp);
4691                 return -EFSCORRUPTED;
4692         }
4693
4694         if (XFS_FORCED_SHUTDOWN(mp))
4695                 return -EIO;
4696
4697         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
4698                 error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
4699                 if (error)
4700                         return error;
4701         }
4702
4703         if (xfs_iext_lookup_extent(ip, ifp, bno, &idx, &got)) {
4704                 /* make sure we only reflink into a hole. */
4705                 ASSERT(got.br_startoff > bno);
4706                 ASSERT(got.br_startoff - bno >= len);
4707         }
4708
4709         ip->i_d.di_nblocks += len;
4710         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
4711
4712         if (ifp->if_flags & XFS_IFBROOT) {
4713                 cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
4714                 cur->bc_private.b.firstblock = firstblock;
4715                 cur->bc_private.b.dfops = dfops;
4716                 cur->bc_private.b.flags = 0;
4717         }
4718
4719         got.br_startoff = bno;
4720         got.br_startblock = startblock;
4721         got.br_blockcount = len;
4722         got.br_state = XFS_EXT_NORM;
4723
4724         error = xfs_bmap_add_extent_hole_real(tp, ip, XFS_DATA_FORK, &idx, &cur,
4725                         &got, &firstblock, dfops, &logflags);
4726         if (error)
4727                 goto error0;
4728
4729         if (xfs_bmap_wants_extents(ip, XFS_DATA_FORK)) {
4730                 int             tmp_logflags = 0;
4731
4732                 error = xfs_bmap_btree_to_extents(tp, ip, cur,
4733                         &tmp_logflags, XFS_DATA_FORK);
4734                 logflags |= tmp_logflags;
4735         }
4736
4737 error0:
4738         if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS)
4739                 logflags &= ~XFS_ILOG_DEXT;
4740         else if (ip->i_d.di_format != XFS_DINODE_FMT_BTREE)
4741                 logflags &= ~XFS_ILOG_DBROOT;
4742
4743         if (logflags)
4744                 xfs_trans_log_inode(tp, ip, logflags);
4745         if (cur) {
4746                 xfs_btree_del_cursor(cur,
4747                                 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
4748         }
4749         return error;
4750 }
4751
4752 /*
4753  * When a delalloc extent is split (e.g., due to a hole punch), the original
4754  * indlen reservation must be shared across the two new extents that are left
4755  * behind.
4756  *
4757  * Given the original reservation and the worst case indlen for the two new
4758  * extents (as calculated by xfs_bmap_worst_indlen()), split the original
4759  * reservation fairly across the two new extents. If necessary, steal available
4760  * blocks from a deleted extent to make up a reservation deficiency (e.g., if
4761  * ores == 1). The number of stolen blocks is returned. The availability and
4762  * subsequent accounting of stolen blocks is the responsibility of the caller.
4763  */
4764 static xfs_filblks_t
4765 xfs_bmap_split_indlen(
4766         xfs_filblks_t                   ores,           /* original res. */
4767         xfs_filblks_t                   *indlen1,       /* ext1 worst indlen */
4768         xfs_filblks_t                   *indlen2,       /* ext2 worst indlen */
4769         xfs_filblks_t                   avail)          /* stealable blocks */
4770 {
4771         xfs_filblks_t                   len1 = *indlen1;
4772         xfs_filblks_t                   len2 = *indlen2;
4773         xfs_filblks_t                   nres = len1 + len2; /* new total res. */
4774         xfs_filblks_t                   stolen = 0;
4775         xfs_filblks_t                   resfactor;
4776
4777         /*
4778          * Steal as many blocks as we can to try and satisfy the worst case
4779          * indlen for both new extents.
4780          */
4781         if (ores < nres && avail)
4782                 stolen = XFS_FILBLKS_MIN(nres - ores, avail);
4783         ores += stolen;
4784
4785          /* nothing else to do if we've satisfied the new reservation */
4786         if (ores >= nres)
4787                 return stolen;
4788
4789         /*
4790          * We can't meet the total required reservation for the two extents.
4791          * Calculate the percent of the overall shortage between both extents
4792          * and apply this percentage to each of the requested indlen values.
4793          * This distributes the shortage fairly and reduces the chances that one
4794          * of the two extents is left with nothing when extents are repeatedly
4795          * split.
4796          */
4797         resfactor = (ores * 100);
4798         do_div(resfactor, nres);
4799         len1 *= resfactor;
4800         do_div(len1, 100);
4801         len2 *= resfactor;
4802         do_div(len2, 100);
4803         ASSERT(len1 + len2 <= ores);
4804         ASSERT(len1 < *indlen1 && len2 < *indlen2);
4805
4806         /*
4807          * Hand out the remainder to each extent. If one of the two reservations
4808          * is zero, we want to make sure that one gets a block first. The loop
4809          * below starts with len1, so hand len2 a block right off the bat if it
4810          * is zero.
4811          */
4812         ores -= (len1 + len2);
4813         ASSERT((*indlen1 - len1) + (*indlen2 - len2) >= ores);
4814         if (ores && !len2 && *indlen2) {
4815                 len2++;
4816                 ores--;
4817         }
4818         while (ores) {
4819                 if (len1 < *indlen1) {
4820                         len1++;
4821                         ores--;
4822                 }
4823                 if (!ores)
4824                         break;
4825                 if (len2 < *indlen2) {
4826                         len2++;
4827                         ores--;
4828                 }
4829         }
4830
4831         *indlen1 = len1;
4832         *indlen2 = len2;
4833
4834         return stolen;
4835 }
4836
4837 int
4838 xfs_bmap_del_extent_delay(
4839         struct xfs_inode        *ip,
4840         int                     whichfork,
4841         xfs_extnum_t            *idx,
4842         struct xfs_bmbt_irec    *got,
4843         struct xfs_bmbt_irec    *del)
4844 {
4845         struct xfs_mount        *mp = ip->i_mount;
4846         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
4847         struct xfs_bmbt_irec    new;
4848         int64_t                 da_old, da_new, da_diff = 0;
4849         xfs_fileoff_t           del_endoff, got_endoff;
4850         xfs_filblks_t           got_indlen, new_indlen, stolen;
4851         int                     error = 0, state = 0;
4852         bool                    isrt;
4853
4854         XFS_STATS_INC(mp, xs_del_exlist);
4855
4856         isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
4857         del_endoff = del->br_startoff + del->br_blockcount;
4858         got_endoff = got->br_startoff + got->br_blockcount;
4859         da_old = startblockval(got->br_startblock);
4860         da_new = 0;
4861
4862         ASSERT(*idx >= 0);
4863         ASSERT(*idx <= xfs_iext_count(ifp));
4864         ASSERT(del->br_blockcount > 0);
4865         ASSERT(got->br_startoff <= del->br_startoff);
4866         ASSERT(got_endoff >= del_endoff);
4867
4868         if (isrt) {
4869                 uint64_t rtexts = XFS_FSB_TO_B(mp, del->br_blockcount);
4870
4871                 do_div(rtexts, mp->m_sb.sb_rextsize);
4872                 xfs_mod_frextents(mp, rtexts);
4873         }
4874
4875         /*
4876          * Update the inode delalloc counter now and wait to update the
4877          * sb counters as we might have to borrow some blocks for the
4878          * indirect block accounting.
4879          */
4880         error = xfs_trans_reserve_quota_nblks(NULL, ip,
4881                         -((long)del->br_blockcount), 0,
4882                         isrt ? XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
4883         if (error)
4884                 return error;
4885         ip->i_delayed_blks -= del->br_blockcount;
4886
4887         if (whichfork == XFS_COW_FORK)
4888                 state |= BMAP_COWFORK;
4889
4890         if (got->br_startoff == del->br_startoff)
4891                 state |= BMAP_LEFT_CONTIG;
4892         if (got_endoff == del_endoff)
4893                 state |= BMAP_RIGHT_CONTIG;
4894
4895         switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
4896         case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
4897                 /*
4898                  * Matches the whole extent.  Delete the entry.
4899                  */
4900                 xfs_iext_remove(ip, *idx, 1, state);
4901                 --*idx;
4902                 break;
4903         case BMAP_LEFT_CONTIG:
4904                 /*
4905                  * Deleting the first part of the extent.
4906                  */
4907                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
4908                 got->br_startoff = del_endoff;
4909                 got->br_blockcount -= del->br_blockcount;
4910                 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip,
4911                                 got->br_blockcount), da_old);
4912                 got->br_startblock = nullstartblock((int)da_new);
4913                 xfs_iext_update_extent(ifp, *idx, got);
4914                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
4915                 break;
4916         case BMAP_RIGHT_CONTIG:
4917                 /*
4918                  * Deleting the last part of the extent.
4919                  */
4920                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
4921                 got->br_blockcount = got->br_blockcount - del->br_blockcount;
4922                 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip,
4923                                 got->br_blockcount), da_old);
4924                 got->br_startblock = nullstartblock((int)da_new);
4925                 xfs_iext_update_extent(ifp, *idx, got);
4926                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
4927                 break;
4928         case 0:
4929                 /*
4930                  * Deleting the middle of the extent.
4931                  *
4932                  * Distribute the original indlen reservation across the two new
4933                  * extents.  Steal blocks from the deleted extent if necessary.
4934                  * Stealing blocks simply fudges the fdblocks accounting below.
4935                  * Warn if either of the new indlen reservations is zero as this
4936                  * can lead to delalloc problems.
4937                  */
4938                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
4939
4940                 got->br_blockcount = del->br_startoff - got->br_startoff;
4941                 got_indlen = xfs_bmap_worst_indlen(ip, got->br_blockcount);
4942
4943                 new.br_blockcount = got_endoff - del_endoff;
4944                 new_indlen = xfs_bmap_worst_indlen(ip, new.br_blockcount);
4945
4946                 WARN_ON_ONCE(!got_indlen || !new_indlen);
4947                 stolen = xfs_bmap_split_indlen(da_old, &got_indlen, &new_indlen,
4948                                                        del->br_blockcount);
4949
4950                 got->br_startblock = nullstartblock((int)got_indlen);
4951                 xfs_iext_update_extent(ifp, *idx, got);
4952                 trace_xfs_bmap_post_update(ip, *idx, 0, _THIS_IP_);
4953
4954                 new.br_startoff = del_endoff;
4955                 new.br_state = got->br_state;
4956                 new.br_startblock = nullstartblock((int)new_indlen);
4957
4958                 ++*idx;
4959                 xfs_iext_insert(ip, *idx, 1, &new, state);
4960
4961                 da_new = got_indlen + new_indlen - stolen;
4962                 del->br_blockcount -= stolen;
4963                 break;
4964         }
4965
4966         ASSERT(da_old >= da_new);
4967         da_diff = da_old - da_new;
4968         if (!isrt)
4969                 da_diff += del->br_blockcount;
4970         if (da_diff)
4971                 xfs_mod_fdblocks(mp, da_diff, false);
4972         return error;
4973 }
4974
4975 void
4976 xfs_bmap_del_extent_cow(
4977         struct xfs_inode        *ip,
4978         xfs_extnum_t            *idx,
4979         struct xfs_bmbt_irec    *got,
4980         struct xfs_bmbt_irec    *del)
4981 {
4982         struct xfs_mount        *mp = ip->i_mount;
4983         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
4984         struct xfs_bmbt_irec    new;
4985         xfs_fileoff_t           del_endoff, got_endoff;
4986         int                     state = BMAP_COWFORK;
4987
4988         XFS_STATS_INC(mp, xs_del_exlist);
4989
4990         del_endoff = del->br_startoff + del->br_blockcount;
4991         got_endoff = got->br_startoff + got->br_blockcount;
4992
4993         ASSERT(*idx >= 0);
4994         ASSERT(*idx <= xfs_iext_count(ifp));
4995         ASSERT(del->br_blockcount > 0);
4996         ASSERT(got->br_startoff <= del->br_startoff);
4997         ASSERT(got_endoff >= del_endoff);
4998         ASSERT(!isnullstartblock(got->br_startblock));
4999
5000         if (got->br_startoff == del->br_startoff)
5001                 state |= BMAP_LEFT_CONTIG;
5002         if (got_endoff == del_endoff)
5003                 state |= BMAP_RIGHT_CONTIG;
5004
5005         switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
5006         case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
5007                 /*
5008                  * Matches the whole extent.  Delete the entry.
5009                  */
5010                 xfs_iext_remove(ip, *idx, 1, state);
5011                 --*idx;
5012                 break;
5013         case BMAP_LEFT_CONTIG:
5014                 /*
5015                  * Deleting the first part of the extent.
5016                  */
5017                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
5018                 got->br_startoff = del_endoff;
5019                 got->br_blockcount -= del->br_blockcount;
5020                 got->br_startblock = del->br_startblock + del->br_blockcount;
5021                 xfs_iext_update_extent(ifp, *idx, got);
5022                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
5023                 break;
5024         case BMAP_RIGHT_CONTIG:
5025                 /*
5026                  * Deleting the last part of the extent.
5027                  */
5028                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
5029                 got->br_blockcount -= del->br_blockcount;
5030                 xfs_iext_update_extent(ifp, *idx, got);
5031                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
5032                 break;
5033         case 0:
5034                 /*
5035                  * Deleting the middle of the extent.
5036                  */
5037                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
5038                 got->br_blockcount = del->br_startoff - got->br_startoff;
5039                 xfs_iext_update_extent(ifp, *idx, got);
5040                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
5041
5042                 new.br_startoff = del_endoff;
5043                 new.br_blockcount = got_endoff - del_endoff;
5044                 new.br_state = got->br_state;
5045                 new.br_startblock = del->br_startblock + del->br_blockcount;
5046
5047                 ++*idx;
5048                 xfs_iext_insert(ip, *idx, 1, &new, state);
5049                 break;
5050         }
5051 }
5052
5053 /*
5054  * Called by xfs_bmapi to update file extent records and the btree
5055  * after removing space (or undoing a delayed allocation).
5056  */
5057 STATIC int                              /* error */
5058 xfs_bmap_del_extent(
5059         xfs_inode_t             *ip,    /* incore inode pointer */
5060         xfs_trans_t             *tp,    /* current transaction pointer */
5061         xfs_extnum_t            *idx,   /* extent number to update/delete */
5062         struct xfs_defer_ops    *dfops, /* list of extents to be freed */
5063         xfs_btree_cur_t         *cur,   /* if null, not a btree */
5064         xfs_bmbt_irec_t         *del,   /* data to remove from extents */
5065         int                     *logflagsp, /* inode logging flags */
5066         int                     whichfork, /* data or attr fork */
5067         int                     bflags) /* bmapi flags */
5068 {
5069         xfs_filblks_t           da_new; /* new delay-alloc indirect blocks */
5070         xfs_filblks_t           da_old; /* old delay-alloc indirect blocks */
5071         xfs_fsblock_t           del_endblock=0; /* first block past del */
5072         xfs_fileoff_t           del_endoff;     /* first offset past del */
5073         int                     delay;  /* current block is delayed allocated */
5074         int                     do_fx;  /* free extent at end of routine */
5075         xfs_bmbt_rec_host_t     *ep;    /* current extent entry pointer */
5076         int                     error;  /* error return value */
5077         int                     flags;  /* inode logging flags */
5078         xfs_bmbt_irec_t         got;    /* current extent entry */
5079         xfs_fileoff_t           got_endoff;     /* first offset past got */
5080         int                     i;      /* temp state */
5081         xfs_ifork_t             *ifp;   /* inode fork pointer */
5082         xfs_mount_t             *mp;    /* mount structure */
5083         xfs_filblks_t           nblks;  /* quota/sb block count */
5084         xfs_bmbt_irec_t         new;    /* new record to be inserted */
5085         /* REFERENCED */
5086         uint                    qfield; /* quota field to update */
5087         xfs_filblks_t           temp;   /* for indirect length calculations */
5088         xfs_filblks_t           temp2;  /* for indirect length calculations */
5089         int                     state = 0;
5090
5091         mp = ip->i_mount;
5092         XFS_STATS_INC(mp, xs_del_exlist);
5093
5094         if (whichfork == XFS_ATTR_FORK)
5095                 state |= BMAP_ATTRFORK;
5096         else if (whichfork == XFS_COW_FORK)
5097                 state |= BMAP_COWFORK;
5098
5099         ifp = XFS_IFORK_PTR(ip, whichfork);
5100         ASSERT((*idx >= 0) && (*idx < xfs_iext_count(ifp)));
5101         ASSERT(del->br_blockcount > 0);
5102         ep = xfs_iext_get_ext(ifp, *idx);
5103         xfs_bmbt_get_all(ep, &got);
5104         ASSERT(got.br_startoff <= del->br_startoff);
5105         del_endoff = del->br_startoff + del->br_blockcount;
5106         got_endoff = got.br_startoff + got.br_blockcount;
5107         ASSERT(got_endoff >= del_endoff);
5108         delay = isnullstartblock(got.br_startblock);
5109         ASSERT(isnullstartblock(del->br_startblock) == delay);
5110         flags = 0;
5111         qfield = 0;
5112         error = 0;
5113         /*
5114          * If deleting a real allocation, must free up the disk space.
5115          */
5116         if (!delay) {
5117                 flags = XFS_ILOG_CORE;
5118                 /*
5119                  * Realtime allocation.  Free it and record di_nblocks update.
5120                  */
5121                 if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
5122                         xfs_fsblock_t   bno;
5123                         xfs_filblks_t   len;
5124
5125                         ASSERT(do_mod(del->br_blockcount,
5126                                       mp->m_sb.sb_rextsize) == 0);
5127                         ASSERT(do_mod(del->br_startblock,
5128                                       mp->m_sb.sb_rextsize) == 0);
5129                         bno = del->br_startblock;
5130                         len = del->br_blockcount;
5131                         do_div(bno, mp->m_sb.sb_rextsize);
5132                         do_div(len, mp->m_sb.sb_rextsize);
5133                         error = xfs_rtfree_extent(tp, bno, (xfs_extlen_t)len);
5134                         if (error)
5135                                 goto done;
5136                         do_fx = 0;
5137                         nblks = len * mp->m_sb.sb_rextsize;
5138                         qfield = XFS_TRANS_DQ_RTBCOUNT;
5139                 }
5140                 /*
5141                  * Ordinary allocation.
5142                  */
5143                 else {
5144                         do_fx = 1;
5145                         nblks = del->br_blockcount;
5146                         qfield = XFS_TRANS_DQ_BCOUNT;
5147                 }
5148                 /*
5149                  * Set up del_endblock and cur for later.
5150                  */
5151                 del_endblock = del->br_startblock + del->br_blockcount;
5152                 if (cur) {
5153                         if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
5154                                         got.br_startblock, got.br_blockcount,
5155                                         &i)))
5156                                 goto done;
5157                         XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
5158                 }
5159                 da_old = da_new = 0;
5160         } else {
5161                 da_old = startblockval(got.br_startblock);
5162                 da_new = 0;
5163                 nblks = 0;
5164                 do_fx = 0;
5165         }
5166
5167         /*
5168          * Set flag value to use in switch statement.
5169          * Left-contig is 2, right-contig is 1.
5170          */
5171         switch (((got.br_startoff == del->br_startoff) << 1) |
5172                 (got_endoff == del_endoff)) {
5173         case 3:
5174                 /*
5175                  * Matches the whole extent.  Delete the entry.
5176                  */
5177                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
5178                 xfs_iext_remove(ip, *idx, 1,
5179                                 whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0);
5180                 --*idx;
5181                 if (delay)
5182                         break;
5183
5184                 XFS_IFORK_NEXT_SET(ip, whichfork,
5185                         XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
5186                 flags |= XFS_ILOG_CORE;
5187                 if (!cur) {
5188                         flags |= xfs_ilog_fext(whichfork);
5189                         break;
5190                 }
5191                 if ((error = xfs_btree_delete(cur, &i)))
5192                         goto done;
5193                 XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
5194                 break;
5195
5196         case 2:
5197                 /*
5198                  * Deleting the first part of the extent.
5199                  */
5200                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
5201                 xfs_bmbt_set_startoff(ep, del_endoff);
5202                 temp = got.br_blockcount - del->br_blockcount;
5203                 xfs_bmbt_set_blockcount(ep, temp);
5204                 if (delay) {
5205                         temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
5206                                 da_old);
5207                         xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
5208                         trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
5209                         da_new = temp;
5210                         break;
5211                 }
5212                 xfs_bmbt_set_startblock(ep, del_endblock);
5213                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
5214                 if (!cur) {
5215                         flags |= xfs_ilog_fext(whichfork);
5216                         break;
5217                 }
5218                 if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
5219                                 got.br_blockcount - del->br_blockcount,
5220                                 got.br_state)))
5221                         goto done;
5222                 break;
5223
5224         case 1:
5225                 /*
5226                  * Deleting the last part of the extent.
5227                  */
5228                 temp = got.br_blockcount - del->br_blockcount;
5229                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
5230                 xfs_bmbt_set_blockcount(ep, temp);
5231                 if (delay) {
5232                         temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
5233                                 da_old);
5234                         xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
5235                         trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
5236                         da_new = temp;
5237                         break;
5238                 }
5239                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
5240                 if (!cur) {
5241                         flags |= xfs_ilog_fext(whichfork);
5242                         break;
5243                 }
5244                 if ((error = xfs_bmbt_update(cur, got.br_startoff,
5245                                 got.br_startblock,
5246                                 got.br_blockcount - del->br_blockcount,
5247                                 got.br_state)))
5248                         goto done;
5249                 break;
5250
5251         case 0:
5252                 /*
5253                  * Deleting the middle of the extent.
5254                  */
5255                 temp = del->br_startoff - got.br_startoff;
5256                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
5257                 xfs_bmbt_set_blockcount(ep, temp);
5258                 new.br_startoff = del_endoff;
5259                 temp2 = got_endoff - del_endoff;
5260                 new.br_blockcount = temp2;
5261                 new.br_state = got.br_state;
5262                 if (!delay) {
5263                         new.br_startblock = del_endblock;
5264                         flags |= XFS_ILOG_CORE;
5265                         if (cur) {
5266                                 if ((error = xfs_bmbt_update(cur,
5267                                                 got.br_startoff,
5268                                                 got.br_startblock, temp,
5269                                                 got.br_state)))
5270                                         goto done;
5271                                 if ((error = xfs_btree_increment(cur, 0, &i)))
5272                                         goto done;
5273                                 cur->bc_rec.b = new;
5274                                 error = xfs_btree_insert(cur, &i);
5275                                 if (error && error != -ENOSPC)
5276                                         goto done;
5277                                 /*
5278                                  * If get no-space back from btree insert,
5279                                  * it tried a split, and we have a zero
5280                                  * block reservation.
5281                                  * Fix up our state and return the error.
5282                                  */
5283                                 if (error == -ENOSPC) {
5284                                         /*
5285                                          * Reset the cursor, don't trust
5286                                          * it after any insert operation.
5287                                          */
5288                                         if ((error = xfs_bmbt_lookup_eq(cur,
5289                                                         got.br_startoff,
5290                                                         got.br_startblock,
5291                                                         temp, &i)))
5292                                                 goto done;
5293                                         XFS_WANT_CORRUPTED_GOTO(mp,
5294                                                                 i == 1, done);
5295                                         /*
5296                                          * Update the btree record back
5297                                          * to the original value.
5298                                          */
5299                                         if ((error = xfs_bmbt_update(cur,
5300                                                         got.br_startoff,
5301                                                         got.br_startblock,
5302                                                         got.br_blockcount,
5303                                                         got.br_state)))
5304                                                 goto done;
5305                                         /*
5306                                          * Reset the extent record back
5307                                          * to the original value.
5308                                          */
5309                                         xfs_bmbt_set_blockcount(ep,
5310                                                 got.br_blockcount);
5311                                         flags = 0;
5312                                         error = -ENOSPC;
5313                                         goto done;
5314                                 }
5315                                 XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
5316                         } else
5317                                 flags |= xfs_ilog_fext(whichfork);
5318                         XFS_IFORK_NEXT_SET(ip, whichfork,
5319                                 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
5320                 } else {
5321                         xfs_filblks_t   stolen;
5322                         ASSERT(whichfork == XFS_DATA_FORK);
5323
5324                         /*
5325                          * Distribute the original indlen reservation across the
5326                          * two new extents. Steal blocks from the deleted extent
5327                          * if necessary. Stealing blocks simply fudges the
5328                          * fdblocks accounting in xfs_bunmapi().
5329                          */
5330                         temp = xfs_bmap_worst_indlen(ip, got.br_blockcount);
5331                         temp2 = xfs_bmap_worst_indlen(ip, new.br_blockcount);
5332                         stolen = xfs_bmap_split_indlen(da_old, &temp, &temp2,
5333                                                        del->br_blockcount);
5334                         da_new = temp + temp2 - stolen;
5335                         del->br_blockcount -= stolen;
5336
5337                         /*
5338                          * Set the reservation for each extent. Warn if either
5339                          * is zero as this can lead to delalloc problems.
5340                          */
5341                         WARN_ON_ONCE(!temp || !temp2);
5342                         xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
5343                         new.br_startblock = nullstartblock((int)temp2);
5344                 }
5345                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
5346                 xfs_iext_insert(ip, *idx + 1, 1, &new, state);
5347                 ++*idx;
5348                 break;
5349         }
5350
5351         /* remove reverse mapping */
5352         if (!delay) {
5353                 error = xfs_rmap_unmap_extent(mp, dfops, ip, whichfork, del);
5354                 if (error)
5355                         goto done;
5356         }
5357
5358         /*
5359          * If we need to, add to list of extents to delete.
5360          */
5361         if (do_fx && !(bflags & XFS_BMAPI_REMAP)) {
5362                 if (xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK) {
5363                         error = xfs_refcount_decrease_extent(mp, dfops, del);
5364                         if (error)
5365                                 goto done;
5366                 } else
5367                         xfs_bmap_add_free(mp, dfops, del->br_startblock,
5368                                         del->br_blockcount, NULL);
5369         }
5370
5371         /*
5372          * Adjust inode # blocks in the file.
5373          */
5374         if (nblks)
5375                 ip->i_d.di_nblocks -= nblks;
5376         /*
5377          * Adjust quota data.
5378          */
5379         if (qfield && !(bflags & XFS_BMAPI_REMAP))
5380                 xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks);
5381
5382         /*
5383          * Account for change in delayed indirect blocks.
5384          * Nothing to do for disk quota accounting here.
5385          */
5386         ASSERT(da_old >= da_new);
5387         if (da_old > da_new)
5388                 xfs_mod_fdblocks(mp, (int64_t)(da_old - da_new), false);
5389 done:
5390         *logflagsp = flags;
5391         return error;
5392 }
5393
5394 /*
5395  * Unmap (remove) blocks from a file.
5396  * If nexts is nonzero then the number of extents to remove is limited to
5397  * that value.  If not all extents in the block range can be removed then
5398  * *done is set.
5399  */
5400 int                                             /* error */
5401 __xfs_bunmapi(
5402         xfs_trans_t             *tp,            /* transaction pointer */
5403         struct xfs_inode        *ip,            /* incore inode */
5404         xfs_fileoff_t           bno,            /* starting offset to unmap */
5405         xfs_filblks_t           *rlen,          /* i/o: amount remaining */
5406         int                     flags,          /* misc flags */
5407         xfs_extnum_t            nexts,          /* number of extents max */
5408         xfs_fsblock_t           *firstblock,    /* first allocated block
5409                                                    controls a.g. for allocs */
5410         struct xfs_defer_ops    *dfops)         /* i/o: deferred updates */
5411 {
5412         xfs_btree_cur_t         *cur;           /* bmap btree cursor */
5413         xfs_bmbt_irec_t         del;            /* extent being deleted */
5414         int                     error;          /* error return value */
5415         xfs_extnum_t            extno;          /* extent number in list */
5416         xfs_bmbt_irec_t         got;            /* current extent record */
5417         xfs_ifork_t             *ifp;           /* inode fork pointer */
5418         int                     isrt;           /* freeing in rt area */
5419         xfs_extnum_t            lastx;          /* last extent index used */
5420         int                     logflags;       /* transaction logging flags */
5421         xfs_extlen_t            mod;            /* rt extent offset */
5422         xfs_mount_t             *mp;            /* mount structure */
5423         xfs_fileoff_t           start;          /* first file offset deleted */
5424         int                     tmp_logflags;   /* partial logging flags */
5425         int                     wasdel;         /* was a delayed alloc extent */
5426         int                     whichfork;      /* data or attribute fork */
5427         xfs_fsblock_t           sum;
5428         xfs_filblks_t           len = *rlen;    /* length to unmap in file */
5429         xfs_fileoff_t           max_len;
5430         xfs_agnumber_t          prev_agno = NULLAGNUMBER, agno;
5431
5432         trace_xfs_bunmap(ip, bno, len, flags, _RET_IP_);
5433
5434         whichfork = xfs_bmapi_whichfork(flags);
5435         ASSERT(whichfork != XFS_COW_FORK);
5436         ifp = XFS_IFORK_PTR(ip, whichfork);
5437         if (unlikely(
5438             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
5439             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
5440                 XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
5441                                  ip->i_mount);
5442                 return -EFSCORRUPTED;
5443         }
5444         mp = ip->i_mount;
5445         if (XFS_FORCED_SHUTDOWN(mp))
5446                 return -EIO;
5447
5448         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
5449         ASSERT(len > 0);
5450         ASSERT(nexts >= 0);
5451
5452         /*
5453          * Guesstimate how many blocks we can unmap without running the risk of
5454          * blowing out the transaction with a mix of EFIs and reflink
5455          * adjustments.
5456          */
5457         if (xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK)
5458                 max_len = min(len, xfs_refcount_max_unmap(tp->t_log_res));
5459         else
5460                 max_len = len;
5461
5462         if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5463             (error = xfs_iread_extents(tp, ip, whichfork)))
5464                 return error;
5465         if (xfs_iext_count(ifp) == 0) {
5466                 *rlen = 0;
5467                 return 0;
5468         }
5469         XFS_STATS_INC(mp, xs_blk_unmap);
5470         isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
5471         start = bno;
5472         bno = start + len - 1;
5473
5474         /*
5475          * Check to see if the given block number is past the end of the
5476          * file, back up to the last block if so...
5477          */
5478         if (!xfs_iext_lookup_extent(ip, ifp, bno, &lastx, &got)) {
5479                 ASSERT(lastx > 0);
5480                 xfs_iext_get_extent(ifp, --lastx, &got);
5481                 bno = got.br_startoff + got.br_blockcount - 1;
5482         }
5483
5484         logflags = 0;
5485         if (ifp->if_flags & XFS_IFBROOT) {
5486                 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
5487                 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
5488                 cur->bc_private.b.firstblock = *firstblock;
5489                 cur->bc_private.b.dfops = dfops;
5490                 cur->bc_private.b.flags = 0;
5491         } else
5492                 cur = NULL;
5493
5494         if (isrt) {
5495                 /*
5496                  * Synchronize by locking the bitmap inode.
5497                  */
5498                 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL|XFS_ILOCK_RTBITMAP);
5499                 xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
5500                 xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL|XFS_ILOCK_RTSUM);
5501                 xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL);
5502         }
5503
5504         extno = 0;
5505         while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
5506                (nexts == 0 || extno < nexts) && max_len > 0) {
5507                 /*
5508                  * Is the found extent after a hole in which bno lives?
5509                  * Just back up to the previous extent, if so.
5510                  */
5511                 if (got.br_startoff > bno) {
5512                         if (--lastx < 0)
5513                                 break;
5514                         xfs_iext_get_extent(ifp, lastx, &got);
5515                 }
5516                 /*
5517                  * Is the last block of this extent before the range
5518                  * we're supposed to delete?  If so, we're done.
5519                  */
5520                 bno = XFS_FILEOFF_MIN(bno,
5521                         got.br_startoff + got.br_blockcount - 1);
5522                 if (bno < start)
5523                         break;
5524                 /*
5525                  * Then deal with the (possibly delayed) allocated space
5526                  * we found.
5527                  */
5528                 del = got;
5529                 wasdel = isnullstartblock(del.br_startblock);
5530
5531                 /*
5532                  * Make sure we don't touch multiple AGF headers out of order
5533                  * in a single transaction, as that could cause AB-BA deadlocks.
5534                  */
5535                 if (!wasdel) {
5536                         agno = XFS_FSB_TO_AGNO(mp, del.br_startblock);
5537                         if (prev_agno != NULLAGNUMBER && prev_agno > agno)
5538                                 break;
5539                         prev_agno = agno;
5540                 }
5541                 if (got.br_startoff < start) {
5542                         del.br_startoff = start;
5543                         del.br_blockcount -= start - got.br_startoff;
5544                         if (!wasdel)
5545                                 del.br_startblock += start - got.br_startoff;
5546                 }
5547                 if (del.br_startoff + del.br_blockcount > bno + 1)
5548                         del.br_blockcount = bno + 1 - del.br_startoff;
5549
5550                 /* How much can we safely unmap? */
5551                 if (max_len < del.br_blockcount) {
5552                         del.br_startoff += del.br_blockcount - max_len;
5553                         if (!wasdel)
5554                                 del.br_startblock += del.br_blockcount - max_len;
5555                         del.br_blockcount = max_len;
5556                 }
5557
5558                 sum = del.br_startblock + del.br_blockcount;
5559                 if (isrt &&
5560                     (mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
5561                         /*
5562                          * Realtime extent not lined up at the end.
5563                          * The extent could have been split into written
5564                          * and unwritten pieces, or we could just be
5565                          * unmapping part of it.  But we can't really
5566                          * get rid of part of a realtime extent.
5567                          */
5568                         if (del.br_state == XFS_EXT_UNWRITTEN ||
5569                             !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5570                                 /*
5571                                  * This piece is unwritten, or we're not
5572                                  * using unwritten extents.  Skip over it.
5573                                  */
5574                                 ASSERT(bno >= mod);
5575                                 bno -= mod > del.br_blockcount ?
5576                                         del.br_blockcount : mod;
5577                                 if (bno < got.br_startoff) {
5578                                         if (--lastx >= 0)
5579                                                 xfs_bmbt_get_all(xfs_iext_get_ext(
5580                                                         ifp, lastx), &got);
5581                                 }
5582                                 continue;
5583                         }
5584                         /*
5585                          * It's written, turn it unwritten.
5586                          * This is better than zeroing it.
5587                          */
5588                         ASSERT(del.br_state == XFS_EXT_NORM);
5589                         ASSERT(tp->t_blk_res > 0);
5590                         /*
5591                          * If this spans a realtime extent boundary,
5592                          * chop it back to the start of the one we end at.
5593                          */
5594                         if (del.br_blockcount > mod) {
5595                                 del.br_startoff += del.br_blockcount - mod;
5596                                 del.br_startblock += del.br_blockcount - mod;
5597                                 del.br_blockcount = mod;
5598                         }
5599                         del.br_state = XFS_EXT_UNWRITTEN;
5600                         error = xfs_bmap_add_extent_unwritten_real(tp, ip,
5601                                         whichfork, &lastx, &cur, &del,
5602                                         firstblock, dfops, &logflags);
5603                         if (error)
5604                                 goto error0;
5605                         goto nodelete;
5606                 }
5607                 if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
5608                         /*
5609                          * Realtime extent is lined up at the end but not
5610                          * at the front.  We'll get rid of full extents if
5611                          * we can.
5612                          */
5613                         mod = mp->m_sb.sb_rextsize - mod;
5614                         if (del.br_blockcount > mod) {
5615                                 del.br_blockcount -= mod;
5616                                 del.br_startoff += mod;
5617                                 del.br_startblock += mod;
5618                         } else if ((del.br_startoff == start &&
5619                                     (del.br_state == XFS_EXT_UNWRITTEN ||
5620                                      tp->t_blk_res == 0)) ||
5621                                    !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
5622                                 /*
5623                                  * Can't make it unwritten.  There isn't
5624                                  * a full extent here so just skip it.
5625                                  */
5626                                 ASSERT(bno >= del.br_blockcount);
5627                                 bno -= del.br_blockcount;
5628                                 if (got.br_startoff > bno && --lastx >= 0)
5629                                         xfs_iext_get_extent(ifp, lastx, &got);
5630                                 continue;
5631                         } else if (del.br_state == XFS_EXT_UNWRITTEN) {
5632                                 struct xfs_bmbt_irec    prev;
5633
5634                                 /*
5635                                  * This one is already unwritten.
5636                                  * It must have a written left neighbor.
5637                                  * Unwrite the killed part of that one and
5638                                  * try again.
5639                                  */
5640                                 ASSERT(lastx > 0);
5641                                 xfs_iext_get_extent(ifp, lastx - 1, &prev);
5642                                 ASSERT(prev.br_state == XFS_EXT_NORM);
5643                                 ASSERT(!isnullstartblock(prev.br_startblock));
5644                                 ASSERT(del.br_startblock ==
5645                                        prev.br_startblock + prev.br_blockcount);
5646                                 if (prev.br_startoff < start) {
5647                                         mod = start - prev.br_startoff;
5648                                         prev.br_blockcount -= mod;
5649                                         prev.br_startblock += mod;
5650                                         prev.br_startoff = start;
5651                                 }
5652                                 prev.br_state = XFS_EXT_UNWRITTEN;
5653                                 lastx--;
5654                                 error = xfs_bmap_add_extent_unwritten_real(tp,
5655                                                 ip, whichfork, &lastx, &cur,
5656                                                 &prev, firstblock, dfops,
5657                                                 &logflags);
5658                                 if (error)
5659                                         goto error0;
5660                                 goto nodelete;
5661                         } else {
5662                                 ASSERT(del.br_state == XFS_EXT_NORM);
5663                                 del.br_state = XFS_EXT_UNWRITTEN;
5664                                 error = xfs_bmap_add_extent_unwritten_real(tp,
5665                                                 ip, whichfork, &lastx, &cur,
5666                                                 &del, firstblock, dfops,
5667                                                 &logflags);
5668                                 if (error)
5669                                         goto error0;
5670                                 goto nodelete;
5671                         }
5672                 }
5673
5674                 /*
5675                  * If it's the case where the directory code is running
5676                  * with no block reservation, and the deleted block is in
5677                  * the middle of its extent, and the resulting insert
5678                  * of an extent would cause transformation to btree format,
5679                  * then reject it.  The calling code will then swap
5680                  * blocks around instead.
5681                  * We have to do this now, rather than waiting for the
5682                  * conversion to btree format, since the transaction
5683                  * will be dirty.
5684                  */
5685                 if (!wasdel && tp->t_blk_res == 0 &&
5686                     XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5687                     XFS_IFORK_NEXTENTS(ip, whichfork) >= /* Note the >= */
5688                         XFS_IFORK_MAXEXT(ip, whichfork) &&
5689                     del.br_startoff > got.br_startoff &&
5690                     del.br_startoff + del.br_blockcount <
5691                     got.br_startoff + got.br_blockcount) {
5692                         error = -ENOSPC;
5693                         goto error0;
5694                 }
5695
5696                 /*
5697                  * Unreserve quota and update realtime free space, if
5698                  * appropriate. If delayed allocation, update the inode delalloc
5699                  * counter now and wait to update the sb counters as
5700                  * xfs_bmap_del_extent() might need to borrow some blocks.
5701                  */
5702                 if (wasdel) {
5703                         ASSERT(startblockval(del.br_startblock) > 0);
5704                         if (isrt) {
5705                                 xfs_filblks_t rtexts;
5706
5707                                 rtexts = XFS_FSB_TO_B(mp, del.br_blockcount);
5708                                 do_div(rtexts, mp->m_sb.sb_rextsize);
5709                                 xfs_mod_frextents(mp, (int64_t)rtexts);
5710                                 (void)xfs_trans_reserve_quota_nblks(NULL,
5711                                         ip, -((long)del.br_blockcount), 0,
5712                                         XFS_QMOPT_RES_RTBLKS);
5713                         } else {
5714                                 (void)xfs_trans_reserve_quota_nblks(NULL,
5715                                         ip, -((long)del.br_blockcount), 0,
5716                                         XFS_QMOPT_RES_REGBLKS);
5717                         }
5718                         ip->i_delayed_blks -= del.br_blockcount;
5719                         if (cur)
5720                                 cur->bc_private.b.flags |=
5721                                         XFS_BTCUR_BPRV_WASDEL;
5722                 } else if (cur)
5723                         cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
5724
5725                 error = xfs_bmap_del_extent(ip, tp, &lastx, dfops, cur, &del,
5726                                 &tmp_logflags, whichfork, flags);
5727                 logflags |= tmp_logflags;
5728                 if (error)
5729                         goto error0;
5730
5731                 if (!isrt && wasdel)
5732                         xfs_mod_fdblocks(mp, (int64_t)del.br_blockcount, false);
5733
5734                 max_len -= del.br_blockcount;
5735                 bno = del.br_startoff - 1;
5736 nodelete:
5737                 /*
5738                  * If not done go on to the next (previous) record.
5739                  */
5740                 if (bno != (xfs_fileoff_t)-1 && bno >= start) {
5741                         if (lastx >= 0) {
5742                                 xfs_iext_get_extent(ifp, lastx, &got);
5743                                 if (got.br_startoff > bno && --lastx >= 0)
5744                                         xfs_iext_get_extent(ifp, lastx, &got);
5745                         }
5746                         extno++;
5747                 }
5748         }
5749         if (bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0)
5750                 *rlen = 0;
5751         else
5752                 *rlen = bno - start + 1;
5753
5754         /*
5755          * Convert to a btree if necessary.
5756          */
5757         if (xfs_bmap_needs_btree(ip, whichfork)) {
5758                 ASSERT(cur == NULL);
5759                 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, dfops,
5760                         &cur, 0, &tmp_logflags, whichfork);
5761                 logflags |= tmp_logflags;
5762                 if (error)
5763                         goto error0;
5764         }
5765         /*
5766          * transform from btree to extents, give it cur
5767          */
5768         else if (xfs_bmap_wants_extents(ip, whichfork)) {
5769                 ASSERT(cur != NULL);
5770                 error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
5771                         whichfork);
5772                 logflags |= tmp_logflags;
5773                 if (error)
5774                         goto error0;
5775         }
5776         /*
5777          * transform from extents to local?
5778          */
5779         error = 0;
5780 error0:
5781         /*
5782          * Log everything.  Do this after conversion, there's no point in
5783          * logging the extent records if we've converted to btree format.
5784          */
5785         if ((logflags & xfs_ilog_fext(whichfork)) &&
5786             XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5787                 logflags &= ~xfs_ilog_fext(whichfork);
5788         else if ((logflags & xfs_ilog_fbroot(whichfork)) &&
5789                  XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5790                 logflags &= ~xfs_ilog_fbroot(whichfork);
5791         /*
5792          * Log inode even in the error case, if the transaction
5793          * is dirty we'll need to shut down the filesystem.
5794          */
5795         if (logflags)
5796                 xfs_trans_log_inode(tp, ip, logflags);
5797         if (cur) {
5798                 if (!error) {
5799                         *firstblock = cur->bc_private.b.firstblock;
5800                         cur->bc_private.b.allocated = 0;
5801                 }
5802                 xfs_btree_del_cursor(cur,
5803                         error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5804         }
5805         return error;
5806 }
5807
5808 /* Unmap a range of a file. */
5809 int
5810 xfs_bunmapi(
5811         xfs_trans_t             *tp,
5812         struct xfs_inode        *ip,
5813         xfs_fileoff_t           bno,
5814         xfs_filblks_t           len,
5815         int                     flags,
5816         xfs_extnum_t            nexts,
5817         xfs_fsblock_t           *firstblock,
5818         struct xfs_defer_ops    *dfops,
5819         int                     *done)
5820 {
5821         int                     error;
5822
5823         error = __xfs_bunmapi(tp, ip, bno, &len, flags, nexts, firstblock,
5824                         dfops);
5825         *done = (len == 0);
5826         return error;
5827 }
5828
5829 /*
5830  * Determine whether an extent shift can be accomplished by a merge with the
5831  * extent that precedes the target hole of the shift.
5832  */
5833 STATIC bool
5834 xfs_bmse_can_merge(
5835         struct xfs_bmbt_irec    *left,  /* preceding extent */
5836         struct xfs_bmbt_irec    *got,   /* current extent to shift */
5837         xfs_fileoff_t           shift)  /* shift fsb */
5838 {
5839         xfs_fileoff_t           startoff;
5840
5841         startoff = got->br_startoff - shift;
5842
5843         /*
5844          * The extent, once shifted, must be adjacent in-file and on-disk with
5845          * the preceding extent.
5846          */
5847         if ((left->br_startoff + left->br_blockcount != startoff) ||
5848             (left->br_startblock + left->br_blockcount != got->br_startblock) ||
5849             (left->br_state != got->br_state) ||
5850             (left->br_blockcount + got->br_blockcount > MAXEXTLEN))
5851                 return false;
5852
5853         return true;
5854 }
5855
5856 /*
5857  * A bmap extent shift adjusts the file offset of an extent to fill a preceding
5858  * hole in the file. If an extent shift would result in the extent being fully
5859  * adjacent to the extent that currently precedes the hole, we can merge with
5860  * the preceding extent rather than do the shift.
5861  *
5862  * This function assumes the caller has verified a shift-by-merge is possible
5863  * with the provided extents via xfs_bmse_can_merge().
5864  */
5865 STATIC int
5866 xfs_bmse_merge(
5867         struct xfs_inode                *ip,
5868         int                             whichfork,
5869         xfs_fileoff_t                   shift,          /* shift fsb */
5870         int                             current_ext,    /* idx of gotp */
5871         struct xfs_bmbt_irec            *got,           /* extent to shift */
5872         struct xfs_bmbt_irec            *left,          /* preceding extent */
5873         struct xfs_btree_cur            *cur,
5874         int                             *logflags,      /* output */
5875         struct xfs_defer_ops            *dfops)
5876 {
5877         struct xfs_ifork                *ifp = XFS_IFORK_PTR(ip, whichfork);
5878         struct xfs_bmbt_irec            new;
5879         xfs_filblks_t                   blockcount;
5880         int                             error, i;
5881         struct xfs_mount                *mp = ip->i_mount;
5882
5883         blockcount = left->br_blockcount + got->br_blockcount;
5884
5885         ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
5886         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
5887         ASSERT(xfs_bmse_can_merge(left, got, shift));
5888
5889         new = *left;
5890         new.br_blockcount = blockcount;
5891
5892         /*
5893          * Update the on-disk extent count, the btree if necessary and log the
5894          * inode.
5895          */
5896         XFS_IFORK_NEXT_SET(ip, whichfork,
5897                            XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
5898         *logflags |= XFS_ILOG_CORE;
5899         if (!cur) {
5900                 *logflags |= XFS_ILOG_DEXT;
5901                 goto done;
5902         }
5903
5904         /* lookup and remove the extent to merge */
5905         error = xfs_bmbt_lookup_eq(cur, got->br_startoff, got->br_startblock,
5906                                    got->br_blockcount, &i);
5907         if (error)
5908                 return error;
5909         XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
5910
5911         error = xfs_btree_delete(cur, &i);
5912         if (error)
5913                 return error;
5914         XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
5915
5916         /* lookup and update size of the previous extent */
5917         error = xfs_bmbt_lookup_eq(cur, left->br_startoff, left->br_startblock,
5918                                    left->br_blockcount, &i);
5919         if (error)
5920                 return error;
5921         XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
5922
5923         error = xfs_bmbt_update(cur, new.br_startoff, new.br_startblock,
5924                                 new.br_blockcount, new.br_state);
5925         if (error)
5926                 return error;
5927
5928 done:
5929         xfs_iext_update_extent(ifp, current_ext - 1, &new);
5930         xfs_iext_remove(ip, current_ext, 1, 0);
5931
5932         /* update reverse mapping. rmap functions merge the rmaps for us */
5933         error = xfs_rmap_unmap_extent(mp, dfops, ip, whichfork, got);
5934         if (error)
5935                 return error;
5936         memcpy(&new, got, sizeof(new));
5937         new.br_startoff = left->br_startoff + left->br_blockcount;
5938         return xfs_rmap_map_extent(mp, dfops, ip, whichfork, &new);
5939 }
5940
5941 /*
5942  * Shift a single extent.
5943  */
5944 STATIC int
5945 xfs_bmse_shift_one(
5946         struct xfs_inode                *ip,
5947         int                             whichfork,
5948         xfs_fileoff_t                   offset_shift_fsb,
5949         int                             *current_ext,
5950         struct xfs_bmbt_irec            *got,
5951         struct xfs_btree_cur            *cur,
5952         int                             *logflags,
5953         enum shift_direction            direction,
5954         struct xfs_defer_ops            *dfops)
5955 {
5956         struct xfs_ifork                *ifp;
5957         struct xfs_mount                *mp;
5958         xfs_fileoff_t                   startoff;
5959         struct xfs_bmbt_irec            adj_irec, new;
5960         int                             error;
5961         int                             i;
5962         int                             total_extents;
5963
5964         mp = ip->i_mount;
5965         ifp = XFS_IFORK_PTR(ip, whichfork);
5966         total_extents = xfs_iext_count(ifp);
5967
5968         /* delalloc extents should be prevented by caller */
5969         XFS_WANT_CORRUPTED_RETURN(mp, !isnullstartblock(got->br_startblock));
5970
5971         if (direction == SHIFT_LEFT) {
5972                 startoff = got->br_startoff - offset_shift_fsb;
5973
5974                 /*
5975                  * Check for merge if we've got an extent to the left,
5976                  * otherwise make sure there's enough room at the start
5977                  * of the file for the shift.
5978                  */
5979                 if (!*current_ext) {
5980                         if (got->br_startoff < offset_shift_fsb)
5981                                 return -EINVAL;
5982                         goto update_current_ext;
5983                 }
5984
5985                 /*
5986                  * grab the left extent and check for a large enough hole.
5987                  */
5988                 xfs_iext_get_extent(ifp, *current_ext - 1, &adj_irec);
5989                 if (startoff < adj_irec.br_startoff + adj_irec.br_blockcount)
5990                         return -EINVAL;
5991
5992                 /* check whether to merge the extent or shift it down */
5993                 if (xfs_bmse_can_merge(&adj_irec, got, offset_shift_fsb)) {
5994                         return xfs_bmse_merge(ip, whichfork, offset_shift_fsb,
5995                                               *current_ext, got, &adj_irec,
5996                                               cur, logflags, dfops);
5997                 }
5998         } else {
5999                 startoff = got->br_startoff + offset_shift_fsb;
6000                 /* nothing to move if this is the last extent */
6001                 if (*current_ext >= (total_extents - 1))
6002                         goto update_current_ext;
6003
6004                 /*
6005                  * If this is not the last extent in the file, make sure there
6006                  * is enough room between current extent and next extent for
6007                  * accommodating the shift.
6008                  */
6009                 xfs_iext_get_extent(ifp, *current_ext + 1, &adj_irec);
6010                 if (startoff + got->br_blockcount > adj_irec.br_startoff)
6011                         return -EINVAL;
6012
6013                 /*
6014                  * Unlike a left shift (which involves a hole punch),
6015                  * a right shift does not modify extent neighbors
6016                  * in any way. We should never find mergeable extents
6017                  * in this scenario. Check anyways and warn if we
6018                  * encounter two extents that could be one.
6019                  */
6020                 if (xfs_bmse_can_merge(got, &adj_irec, offset_shift_fsb))
6021                         WARN_ON_ONCE(1);
6022         }
6023
6024         /*
6025          * Increment the extent index for the next iteration, update the start
6026          * offset of the in-core extent and update the btree if applicable.
6027          */
6028 update_current_ext:
6029         *logflags |= XFS_ILOG_CORE;
6030
6031         new = *got;
6032         new.br_startoff = startoff;
6033
6034         if (cur) {
6035                 error = xfs_bmbt_lookup_eq(cur, got->br_startoff,
6036                                 got->br_startblock, got->br_blockcount, &i);
6037                 if (error)
6038                         return error;
6039                 XFS_WANT_CORRUPTED_RETURN(mp, i == 1);
6040
6041                 error = xfs_bmbt_update(cur, new.br_startoff,
6042                                 new.br_startblock, new.br_blockcount,
6043                                 new.br_state);
6044                 if (error)
6045                         return error;
6046         } else {
6047                 *logflags |= XFS_ILOG_DEXT;
6048         }
6049
6050         xfs_iext_update_extent(ifp, *current_ext, &new);
6051
6052         if (direction == SHIFT_LEFT)
6053                 (*current_ext)++;
6054         else
6055                 (*current_ext)--;
6056
6057         /* update reverse mapping */
6058         error = xfs_rmap_unmap_extent(mp, dfops, ip, whichfork, got);
6059         if (error)
6060                 return error;
6061         return xfs_rmap_map_extent(mp, dfops, ip, whichfork, &new);
6062 }
6063
6064 /*
6065  * Shift extent records to the left/right to cover/create a hole.
6066  *
6067  * The maximum number of extents to be shifted in a single operation is
6068  * @num_exts. @stop_fsb specifies the file offset at which to stop shift and the
6069  * file offset where we've left off is returned in @next_fsb. @offset_shift_fsb
6070  * is the length by which each extent is shifted. If there is no hole to shift
6071  * the extents into, this will be considered invalid operation and we abort
6072  * immediately.
6073  */
6074 int
6075 xfs_bmap_shift_extents(
6076         struct xfs_trans        *tp,
6077         struct xfs_inode        *ip,
6078         xfs_fileoff_t           *next_fsb,
6079         xfs_fileoff_t           offset_shift_fsb,
6080         int                     *done,
6081         xfs_fileoff_t           stop_fsb,
6082         xfs_fsblock_t           *firstblock,
6083         struct xfs_defer_ops    *dfops,
6084         enum shift_direction    direction,
6085         int                     num_exts)
6086 {
6087         struct xfs_btree_cur            *cur = NULL;
6088         struct xfs_bmbt_irec            got;
6089         struct xfs_mount                *mp = ip->i_mount;
6090         struct xfs_ifork                *ifp;
6091         xfs_extnum_t                    nexts = 0;
6092         xfs_extnum_t                    current_ext;
6093         xfs_extnum_t                    total_extents;
6094         xfs_extnum_t                    stop_extent;
6095         int                             error = 0;
6096         int                             whichfork = XFS_DATA_FORK;
6097         int                             logflags = 0;
6098
6099         if (unlikely(XFS_TEST_ERROR(
6100             (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
6101              XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
6102              mp, XFS_ERRTAG_BMAPIFORMAT))) {
6103                 XFS_ERROR_REPORT("xfs_bmap_shift_extents",
6104                                  XFS_ERRLEVEL_LOW, mp);
6105                 return -EFSCORRUPTED;
6106         }
6107
6108         if (XFS_FORCED_SHUTDOWN(mp))
6109                 return -EIO;
6110
6111         ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
6112         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
6113         ASSERT(direction == SHIFT_LEFT || direction == SHIFT_RIGHT);
6114
6115         ifp = XFS_IFORK_PTR(ip, whichfork);
6116         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
6117                 /* Read in all the extents */
6118                 error = xfs_iread_extents(tp, ip, whichfork);
6119                 if (error)
6120                         return error;
6121         }
6122
6123         if (ifp->if_flags & XFS_IFBROOT) {
6124                 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
6125                 cur->bc_private.b.firstblock = *firstblock;
6126                 cur->bc_private.b.dfops = dfops;
6127                 cur->bc_private.b.flags = 0;
6128         }
6129
6130         /*
6131          * There may be delalloc extents in the data fork before the range we
6132          * are collapsing out, so we cannot use the count of real extents here.
6133          * Instead we have to calculate it from the incore fork.
6134          */
6135         total_extents = xfs_iext_count(ifp);
6136         if (total_extents == 0) {
6137                 *done = 1;
6138                 goto del_cursor;
6139         }
6140
6141         /*
6142          * In case of first right shift, we need to initialize next_fsb
6143          */
6144         if (*next_fsb == NULLFSBLOCK) {
6145                 ASSERT(direction == SHIFT_RIGHT);
6146
6147                 current_ext = total_extents - 1;
6148                 xfs_iext_get_extent(ifp, current_ext, &got);
6149                 if (stop_fsb > got.br_startoff) {
6150                         *done = 1;
6151                         goto del_cursor;
6152                 }
6153                 *next_fsb = got.br_startoff;
6154         } else {
6155                 /*
6156                  * Look up the extent index for the fsb where we start shifting. We can
6157                  * henceforth iterate with current_ext as extent list changes are locked
6158                  * out via ilock.
6159                  *
6160                  * If next_fsb lies in a hole beyond which there are no extents we are
6161                  * done.
6162                  */
6163                 if (!xfs_iext_lookup_extent(ip, ifp, *next_fsb, &current_ext,
6164                                 &got)) {
6165                         *done = 1;
6166                         goto del_cursor;
6167                 }
6168         }
6169
6170         /* Lookup the extent index at which we have to stop */
6171         if (direction == SHIFT_RIGHT) {
6172                 struct xfs_bmbt_irec s;
6173
6174                 xfs_iext_lookup_extent(ip, ifp, stop_fsb, &stop_extent, &s);
6175                 /* Make stop_extent exclusive of shift range */
6176                 stop_extent--;
6177                 if (current_ext <= stop_extent) {
6178                         error = -EIO;
6179                         goto del_cursor;
6180                 }
6181         } else {
6182                 stop_extent = total_extents;
6183                 if (current_ext >= stop_extent) {
6184                         error = -EIO;
6185                         goto del_cursor;
6186                 }
6187         }
6188
6189         while (nexts++ < num_exts) {
6190                 error = xfs_bmse_shift_one(ip, whichfork, offset_shift_fsb,
6191                                            &current_ext, &got, cur, &logflags,
6192                                            direction, dfops);
6193                 if (error)
6194                         goto del_cursor;
6195                 /*
6196                  * If there was an extent merge during the shift, the extent
6197                  * count can change. Update the total and grade the next record.
6198                  */
6199                 if (direction == SHIFT_LEFT) {
6200                         total_extents = xfs_iext_count(ifp);
6201                         stop_extent = total_extents;
6202                 }
6203
6204                 if (current_ext == stop_extent) {
6205                         *done = 1;
6206                         *next_fsb = NULLFSBLOCK;
6207                         break;
6208                 }
6209                 xfs_iext_get_extent(ifp, current_ext, &got);
6210         }
6211
6212         if (!*done)
6213                 *next_fsb = got.br_startoff;
6214
6215 del_cursor:
6216         if (cur)
6217                 xfs_btree_del_cursor(cur,
6218                         error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
6219
6220         if (logflags)
6221                 xfs_trans_log_inode(tp, ip, logflags);
6222
6223         return error;
6224 }
6225
6226 /*
6227  * Splits an extent into two extents at split_fsb block such that it is
6228  * the first block of the current_ext. @current_ext is a target extent
6229  * to be split. @split_fsb is a block where the extents is split.
6230  * If split_fsb lies in a hole or the first block of extents, just return 0.
6231  */
6232 STATIC int
6233 xfs_bmap_split_extent_at(
6234         struct xfs_trans        *tp,
6235         struct xfs_inode        *ip,
6236         xfs_fileoff_t           split_fsb,
6237         xfs_fsblock_t           *firstfsb,
6238         struct xfs_defer_ops    *dfops)
6239 {
6240         int                             whichfork = XFS_DATA_FORK;
6241         struct xfs_btree_cur            *cur = NULL;
6242         struct xfs_bmbt_irec            got;
6243         struct xfs_bmbt_irec            new; /* split extent */
6244         struct xfs_mount                *mp = ip->i_mount;
6245         struct xfs_ifork                *ifp;
6246         xfs_fsblock_t                   gotblkcnt; /* new block count for got */
6247         xfs_extnum_t                    current_ext;
6248         int                             error = 0;
6249         int                             logflags = 0;
6250         int                             i = 0;
6251
6252         if (unlikely(XFS_TEST_ERROR(
6253             (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
6254              XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
6255              mp, XFS_ERRTAG_BMAPIFORMAT))) {
6256                 XFS_ERROR_REPORT("xfs_bmap_split_extent_at",
6257                                  XFS_ERRLEVEL_LOW, mp);
6258                 return -EFSCORRUPTED;
6259         }
6260
6261         if (XFS_FORCED_SHUTDOWN(mp))
6262                 return -EIO;
6263
6264         ifp = XFS_IFORK_PTR(ip, whichfork);
6265         if (!(ifp->if_flags & XFS_IFEXTENTS)) {
6266                 /* Read in all the extents */
6267                 error = xfs_iread_extents(tp, ip, whichfork);
6268                 if (error)
6269                         return error;
6270         }
6271
6272         /*
6273          * If there are not extents, or split_fsb lies in a hole we are done.
6274          */
6275         if (!xfs_iext_lookup_extent(ip, ifp, split_fsb, &current_ext, &got) ||
6276             got.br_startoff >= split_fsb)
6277                 return 0;
6278
6279         gotblkcnt = split_fsb - got.br_startoff;
6280         new.br_startoff = split_fsb;
6281         new.br_startblock = got.br_startblock + gotblkcnt;
6282         new.br_blockcount = got.br_blockcount - gotblkcnt;
6283         new.br_state = got.br_state;
6284
6285         if (ifp->if_flags & XFS_IFBROOT) {
6286                 cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
6287                 cur->bc_private.b.firstblock = *firstfsb;
6288                 cur->bc_private.b.dfops = dfops;
6289                 cur->bc_private.b.flags = 0;
6290                 error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
6291                                 got.br_startblock,
6292                                 got.br_blockcount,
6293                                 &i);
6294                 if (error)
6295                         goto del_cursor;
6296                 XFS_WANT_CORRUPTED_GOTO(mp, i == 1, del_cursor);
6297         }
6298
6299         got.br_blockcount = gotblkcnt;
6300         xfs_iext_update_extent(ifp, current_ext, &got);
6301
6302         logflags = XFS_ILOG_CORE;
6303         if (cur) {
6304                 error = xfs_bmbt_update(cur, got.br_startoff,
6305                                 got.br_startblock,
6306                                 got.br_blockcount,
6307                                 got.br_state);
6308                 if (error)
6309                         goto del_cursor;
6310         } else
6311                 logflags |= XFS_ILOG_DEXT;
6312
6313         /* Add new extent */
6314         current_ext++;
6315         xfs_iext_insert(ip, current_ext, 1, &new, 0);
6316         XFS_IFORK_NEXT_SET(ip, whichfork,
6317                            XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
6318
6319         if (cur) {
6320                 error = xfs_bmbt_lookup_eq(cur, new.br_startoff,
6321                                 new.br_startblock, new.br_blockcount,
6322                                 &i);
6323                 if (error)
6324                         goto del_cursor;
6325                 XFS_WANT_CORRUPTED_GOTO(mp, i == 0, del_cursor);
6326                 cur->bc_rec.b.br_state = new.br_state;
6327
6328                 error = xfs_btree_insert(cur, &i);
6329                 if (error)
6330                         goto del_cursor;
6331                 XFS_WANT_CORRUPTED_GOTO(mp, i == 1, del_cursor);
6332         }
6333
6334         /*
6335          * Convert to a btree if necessary.
6336          */
6337         if (xfs_bmap_needs_btree(ip, whichfork)) {
6338                 int tmp_logflags; /* partial log flag return val */
6339
6340                 ASSERT(cur == NULL);
6341                 error = xfs_bmap_extents_to_btree(tp, ip, firstfsb, dfops,
6342                                 &cur, 0, &tmp_logflags, whichfork);
6343                 logflags |= tmp_logflags;
6344         }
6345
6346 del_cursor:
6347         if (cur) {
6348                 cur->bc_private.b.allocated = 0;
6349                 xfs_btree_del_cursor(cur,
6350                                 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
6351         }
6352
6353         if (logflags)
6354                 xfs_trans_log_inode(tp, ip, logflags);
6355         return error;
6356 }
6357
6358 int
6359 xfs_bmap_split_extent(
6360         struct xfs_inode        *ip,
6361         xfs_fileoff_t           split_fsb)
6362 {
6363         struct xfs_mount        *mp = ip->i_mount;
6364         struct xfs_trans        *tp;
6365         struct xfs_defer_ops    dfops;
6366         xfs_fsblock_t           firstfsb;
6367         int                     error;
6368
6369         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write,
6370                         XFS_DIOSTRAT_SPACE_RES(mp, 0), 0, 0, &tp);
6371         if (error)
6372                 return error;
6373
6374         xfs_ilock(ip, XFS_ILOCK_EXCL);
6375         xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
6376
6377         xfs_defer_init(&dfops, &firstfsb);
6378
6379         error = xfs_bmap_split_extent_at(tp, ip, split_fsb,
6380                         &firstfsb, &dfops);
6381         if (error)
6382                 goto out;
6383
6384         error = xfs_defer_finish(&tp, &dfops);
6385         if (error)
6386                 goto out;
6387
6388         return xfs_trans_commit(tp);
6389
6390 out:
6391         xfs_defer_cancel(&dfops);
6392         xfs_trans_cancel(tp);
6393         return error;
6394 }
6395
6396 /* Deferred mapping is only for real extents in the data fork. */
6397 static bool
6398 xfs_bmap_is_update_needed(
6399         struct xfs_bmbt_irec    *bmap)
6400 {
6401         return  bmap->br_startblock != HOLESTARTBLOCK &&
6402                 bmap->br_startblock != DELAYSTARTBLOCK;
6403 }
6404
6405 /* Record a bmap intent. */
6406 static int
6407 __xfs_bmap_add(
6408         struct xfs_mount                *mp,
6409         struct xfs_defer_ops            *dfops,
6410         enum xfs_bmap_intent_type       type,
6411         struct xfs_inode                *ip,
6412         int                             whichfork,
6413         struct xfs_bmbt_irec            *bmap)
6414 {
6415         int                             error;
6416         struct xfs_bmap_intent          *bi;
6417
6418         trace_xfs_bmap_defer(mp,
6419                         XFS_FSB_TO_AGNO(mp, bmap->br_startblock),
6420                         type,
6421                         XFS_FSB_TO_AGBNO(mp, bmap->br_startblock),
6422                         ip->i_ino, whichfork,
6423                         bmap->br_startoff,
6424                         bmap->br_blockcount,
6425                         bmap->br_state);
6426
6427         bi = kmem_alloc(sizeof(struct xfs_bmap_intent), KM_SLEEP | KM_NOFS);
6428         INIT_LIST_HEAD(&bi->bi_list);
6429         bi->bi_type = type;
6430         bi->bi_owner = ip;
6431         bi->bi_whichfork = whichfork;
6432         bi->bi_bmap = *bmap;
6433
6434         error = xfs_defer_ijoin(dfops, bi->bi_owner);
6435         if (error) {
6436                 kmem_free(bi);
6437                 return error;
6438         }
6439
6440         xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_BMAP, &bi->bi_list);
6441         return 0;
6442 }
6443
6444 /* Map an extent into a file. */
6445 int
6446 xfs_bmap_map_extent(
6447         struct xfs_mount        *mp,
6448         struct xfs_defer_ops    *dfops,
6449         struct xfs_inode        *ip,
6450         struct xfs_bmbt_irec    *PREV)
6451 {
6452         if (!xfs_bmap_is_update_needed(PREV))
6453                 return 0;
6454
6455         return __xfs_bmap_add(mp, dfops, XFS_BMAP_MAP, ip,
6456                         XFS_DATA_FORK, PREV);
6457 }
6458
6459 /* Unmap an extent out of a file. */
6460 int
6461 xfs_bmap_unmap_extent(
6462         struct xfs_mount        *mp,
6463         struct xfs_defer_ops    *dfops,
6464         struct xfs_inode        *ip,
6465         struct xfs_bmbt_irec    *PREV)
6466 {
6467         if (!xfs_bmap_is_update_needed(PREV))
6468                 return 0;
6469
6470         return __xfs_bmap_add(mp, dfops, XFS_BMAP_UNMAP, ip,
6471                         XFS_DATA_FORK, PREV);
6472 }
6473
6474 /*
6475  * Process one of the deferred bmap operations.  We pass back the
6476  * btree cursor to maintain our lock on the bmapbt between calls.
6477  */
6478 int
6479 xfs_bmap_finish_one(
6480         struct xfs_trans                *tp,
6481         struct xfs_defer_ops            *dfops,
6482         struct xfs_inode                *ip,
6483         enum xfs_bmap_intent_type       type,
6484         int                             whichfork,
6485         xfs_fileoff_t                   startoff,
6486         xfs_fsblock_t                   startblock,
6487         xfs_filblks_t                   *blockcount,
6488         xfs_exntst_t                    state)
6489 {
6490         xfs_fsblock_t                   firstfsb;
6491         int                             error = 0;
6492
6493         /*
6494          * firstfsb is tied to the transaction lifetime and is used to
6495          * ensure correct AG locking order and schedule work item
6496          * continuations.  XFS_BUI_MAX_FAST_EXTENTS (== 1) restricts us
6497          * to only making one bmap call per transaction, so it should
6498          * be safe to have it as a local variable here.
6499          */
6500         firstfsb = NULLFSBLOCK;
6501
6502         trace_xfs_bmap_deferred(tp->t_mountp,
6503                         XFS_FSB_TO_AGNO(tp->t_mountp, startblock), type,
6504                         XFS_FSB_TO_AGBNO(tp->t_mountp, startblock),
6505                         ip->i_ino, whichfork, startoff, *blockcount, state);
6506
6507         if (WARN_ON_ONCE(whichfork != XFS_DATA_FORK))
6508                 return -EFSCORRUPTED;
6509
6510         if (XFS_TEST_ERROR(false, tp->t_mountp,
6511                         XFS_ERRTAG_BMAP_FINISH_ONE))
6512                 return -EIO;
6513
6514         switch (type) {
6515         case XFS_BMAP_MAP:
6516                 error = xfs_bmapi_remap(tp, ip, startoff, *blockcount,
6517                                 startblock, dfops);
6518                 *blockcount = 0;
6519                 break;
6520         case XFS_BMAP_UNMAP:
6521                 error = __xfs_bunmapi(tp, ip, startoff, blockcount,
6522                                 XFS_BMAPI_REMAP, 1, &firstfsb, dfops);
6523                 break;
6524         default:
6525                 ASSERT(0);
6526                 error = -EFSCORRUPTED;
6527         }
6528
6529         return error;
6530 }