fs/xfs/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_types.h"
  21 #include "xfs_bit.h"
  22 #include "xfs_log.h"
  23 #include "xfs_inum.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_dir2.h"
  28 #include "xfs_da_btree.h"
  29 #include "xfs_bmap_btree.h"
  30 #include "xfs_alloc_btree.h"
  31 #include "xfs_ialloc_btree.h"
  32 #include "xfs_dinode.h"
  33 #include "xfs_inode.h"
  34 #include "xfs_btree.h"
  35 #include "xfs_mount.h"
  36 #include "xfs_itable.h"
  37 #include "xfs_inode_item.h"
  38 #include "xfs_extfree_item.h"
  39 #include "xfs_alloc.h"
  40 #include "xfs_bmap.h"
  41 #include "xfs_rtalloc.h"
  42 #include "xfs_error.h"
  43 #include "xfs_attr_leaf.h"
  44 #include "xfs_rw.h"
  45 #include "xfs_quota.h"
  46 #include "xfs_trans_space.h"
  47 #include "xfs_buf_item.h"
  48 #include "xfs_filestream.h"
  49 #include "xfs_vnodeops.h"
  50 #include "xfs_trace.h"
  51
  52
  53 kmem_zone_t             *xfs_bmap_free_item_zone;
  54
  55 /*
  56  * Prototypes for internal bmap routines.
  57  */
  58
  59 #ifdef DEBUG
  60 STATIC void
  61 xfs_bmap_check_leaf_extents(
  62         struct xfs_btree_cur    *cur,
  63         struct xfs_inode        *ip,
  64         int                     whichfork);
  65 #else
  66 #define xfs_bmap_check_leaf_extents(cur, ip, whichfork)         do { } while (0)
  67 #endif
  68
  69
  70 /*
  71  * Called from xfs_bmap_add_attrfork to handle extents format files.
  72  */
  73 STATIC int                                      /* error */
  74 xfs_bmap_add_attrfork_extents(
  75         xfs_trans_t             *tp,            /* transaction pointer */
  76         xfs_inode_t             *ip,            /* incore inode pointer */
  77         xfs_fsblock_t           *firstblock,    /* first block allocated */
  78         xfs_bmap_free_t         *flist,         /* blocks to free at commit */
  79         int                     *flags);        /* inode logging flags */
  80
  81 /*
  82  * Called from xfs_bmap_add_attrfork to handle local format files.
  83  */
  84 STATIC int                                      /* error */
  85 xfs_bmap_add_attrfork_local(
  86         xfs_trans_t             *tp,            /* transaction pointer */
  87         xfs_inode_t             *ip,            /* incore inode pointer */
  88         xfs_fsblock_t           *firstblock,    /* first block allocated */
  89         xfs_bmap_free_t         *flist,         /* blocks to free at commit */
  90         int                     *flags);        /* inode logging flags */
  91
  92 /*
  93  * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
  94  * It figures out where to ask the underlying allocator to put the new extent.
  95  */
  96 STATIC int                              /* error */
  97 xfs_bmap_alloc(
  98         xfs_bmalloca_t          *ap);   /* bmap alloc argument struct */
  99
 100 /*
 101  * Transform a btree format file with only one leaf node, where the
 102  * extents list will fit in the inode, into an extents format file.
 103  * Since the file extents are already in-core, all we have to do is
 104  * give up the space for the btree root and pitch the leaf block.
 105  */
 106 STATIC int                              /* error */
 107 xfs_bmap_btree_to_extents(
 108         xfs_trans_t             *tp,    /* transaction pointer */
 109         xfs_inode_t             *ip,    /* incore inode pointer */
 110         xfs_btree_cur_t         *cur,   /* btree cursor */
 111         int                     *logflagsp, /* inode logging flags */
 112         int                     whichfork); /* data or attr fork */
 113
 114 /*
 115  * Remove the entry "free" from the free item list.  Prev points to the
 116  * previous entry, unless "free" is the head of the list.
 117  */
 118 STATIC void
 119 xfs_bmap_del_free(
 120         xfs_bmap_free_t         *flist, /* free item list header */
 121         xfs_bmap_free_item_t    *prev,  /* previous item on list, if any */
 122         xfs_bmap_free_item_t    *free); /* list item to be freed */
 123
 124 /*
 125  * Convert an extents-format file into a btree-format file.
 126  * The new file will have a root block (in the inode) and a single child block.
 127  */
 128 STATIC int                                      /* error */
 129 xfs_bmap_extents_to_btree(
 130         xfs_trans_t             *tp,            /* transaction pointer */
 131         xfs_inode_t             *ip,            /* incore inode pointer */
 132         xfs_fsblock_t           *firstblock,    /* first-block-allocated */
 133         xfs_bmap_free_t         *flist,         /* blocks freed in xaction */
 134         xfs_btree_cur_t         **curp,         /* cursor returned to caller */
 135         int                     wasdel,         /* converting a delayed alloc */
 136         int                     *logflagsp,     /* inode logging flags */
 137         int                     whichfork);     /* data or attr fork */
 138
 139 /*
 140  * Convert a local file to an extents file.
 141  * This code is sort of bogus, since the file data needs to get
 142  * logged so it won't be lost.  The bmap-level manipulations are ok, though.
 143  */
 144 STATIC int                              /* error */
 145 xfs_bmap_local_to_extents(
 146         xfs_trans_t     *tp,            /* transaction pointer */
 147         xfs_inode_t     *ip,            /* incore inode pointer */
 148         xfs_fsblock_t   *firstblock,    /* first block allocated in xaction */
 149         xfs_extlen_t    total,          /* total blocks needed by transaction */
 150         int             *logflagsp,     /* inode logging flags */
 151         int             whichfork);     /* data or attr fork */
 152
 153 /*
 154  * Search the extents list for the inode, for the extent containing bno.
 155  * If bno lies in a hole, point to the next entry.  If bno lies past eof,
 156  * *eofp will be set, and *prevp will contain the last entry (null if none).
 157  * Else, *lastxp will be set to the index of the found
 158  * entry; *gotp will contain the entry.
 159  */
 160 STATIC xfs_bmbt_rec_host_t *            /* pointer to found extent entry */
 161 xfs_bmap_search_extents(
 162         xfs_inode_t     *ip,            /* incore inode pointer */
 163         xfs_fileoff_t   bno,            /* block number searched for */
 164         int             whichfork,      /* data or attr fork */
 165         int             *eofp,          /* out: end of file found */
 166         xfs_extnum_t    *lastxp,        /* out: last extent index */
 167         xfs_bmbt_irec_t *gotp,          /* out: extent entry found */
 168         xfs_bmbt_irec_t *prevp);        /* out: previous extent entry found */
 169
 170 /*
 171  * Compute the worst-case number of indirect blocks that will be used
 172  * for ip's delayed extent of length "len".
 173  */
 174 STATIC xfs_filblks_t
 175 xfs_bmap_worst_indlen(
 176         xfs_inode_t             *ip,    /* incore inode pointer */
 177         xfs_filblks_t           len);   /* delayed extent length */
 178
 179 #ifdef DEBUG
 180 /*
 181  * Perform various validation checks on the values being returned
 182  * from xfs_bmapi().
 183  */
 184 STATIC void
 185 xfs_bmap_validate_ret(
 186         xfs_fileoff_t           bno,
 187         xfs_filblks_t           len,
 188         int                     flags,
 189         xfs_bmbt_irec_t         *mval,
 190         int                     nmap,
 191         int                     ret_nmap);
 192 #else
 193 #define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
 194 #endif /* DEBUG */
 195
 196 STATIC int
 197 xfs_bmap_count_tree(
 198         xfs_mount_t     *mp,
 199         xfs_trans_t     *tp,
 200         xfs_ifork_t     *ifp,
 201         xfs_fsblock_t   blockno,
 202         int             levelin,
 203         int             *count);
 204
 205 STATIC void
 206 xfs_bmap_count_leaves(
 207         xfs_ifork_t             *ifp,
 208         xfs_extnum_t            idx,
 209         int                     numrecs,
 210         int                     *count);
 211
 212 STATIC void
 213 xfs_bmap_disk_count_leaves(
 214         struct xfs_mount        *mp,
 215         struct xfs_btree_block  *block,
 216         int                     numrecs,
 217         int                     *count);
 218
 219 /*
 220  * Bmap internal routines.
 221  */
 222
 223 STATIC int                              /* error */
 224 xfs_bmbt_lookup_eq(
 225         struct xfs_btree_cur    *cur,
 226         xfs_fileoff_t           off,
 227         xfs_fsblock_t           bno,
 228         xfs_filblks_t           len,
 229         int                     *stat)  /* success/failure */
 230 {
 231         cur->bc_rec.b.br_startoff = off;
 232         cur->bc_rec.b.br_startblock = bno;
 233         cur->bc_rec.b.br_blockcount = len;
 234         return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
 235 }
 236
 237 STATIC int                              /* error */
 238 xfs_bmbt_lookup_ge(
 239         struct xfs_btree_cur    *cur,
 240         xfs_fileoff_t           off,
 241         xfs_fsblock_t           bno,
 242         xfs_filblks_t           len,
 243         int                     *stat)  /* success/failure */
 244 {
 245         cur->bc_rec.b.br_startoff = off;
 246         cur->bc_rec.b.br_startblock = bno;
 247         cur->bc_rec.b.br_blockcount = len;
 248         return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
 249 }
 250
 251 /*
 252  * Check if the inode needs to be converted to btree format.
 253  */
 254 static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork)
 255 {
 256         return XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
 257                 XFS_IFORK_NEXTENTS(ip, whichfork) >
 258                         XFS_IFORK_MAXEXT(ip, whichfork);
 259 }
 260
 261 /*
 262  * Check if the inode should be converted to extent format.
 263  */
 264 static inline bool xfs_bmap_wants_extents(struct xfs_inode *ip, int whichfork)
 265 {
 266         return XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
 267                 XFS_IFORK_NEXTENTS(ip, whichfork) <=
 268                         XFS_IFORK_MAXEXT(ip, whichfork);
 269 }
 270
 271 /*
 272  * Update the record referred to by cur to the value given
 273  * by [off, bno, len, state].
 274  * This either works (return 0) or gets an EFSCORRUPTED error.
 275  */
 276 STATIC int
 277 xfs_bmbt_update(
 278         struct xfs_btree_cur    *cur,
 279         xfs_fileoff_t           off,
 280         xfs_fsblock_t           bno,
 281         xfs_filblks_t           len,
 282         xfs_exntst_t            state)
 283 {
 284         union xfs_btree_rec     rec;
 285
 286         xfs_bmbt_disk_set_allf(&rec.bmbt, off, bno, len, state);
 287         return xfs_btree_update(cur, &rec);
 288 }
 289
 290 /*
 291  * Called from xfs_bmap_add_attrfork to handle btree format files.
 292  */
 293 STATIC int                                      /* error */
 294 xfs_bmap_add_attrfork_btree(
 295         xfs_trans_t             *tp,            /* transaction pointer */
 296         xfs_inode_t             *ip,            /* incore inode pointer */
 297         xfs_fsblock_t           *firstblock,    /* first block allocated */
 298         xfs_bmap_free_t         *flist,         /* blocks to free at commit */
 299         int                     *flags)         /* inode logging flags */
 300 {
 301         xfs_btree_cur_t         *cur;           /* btree cursor */
 302         int                     error;          /* error return value */
 303         xfs_mount_t             *mp;            /* file system mount struct */
 304         int                     stat;           /* newroot status */
 305
 306         mp = ip->i_mount;
 307         if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
 308                 *flags |= XFS_ILOG_DBROOT;
 309         else {
 310                 cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
 311                 cur->bc_private.b.flist = flist;
 312                 cur->bc_private.b.firstblock = *firstblock;
 313                 if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
 314                         goto error0;
 315                 /* must be at least one entry */
 316                 XFS_WANT_CORRUPTED_GOTO(stat == 1, error0);
 317                 if ((error = xfs_btree_new_iroot(cur, flags, &stat)))
 318                         goto error0;
 319                 if (stat == 0) {
 320                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 321                         return XFS_ERROR(ENOSPC);
 322                 }
 323                 *firstblock = cur->bc_private.b.firstblock;
 324                 cur->bc_private.b.allocated = 0;
 325                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 326         }
 327         return 0;
 328 error0:
 329         xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 330         return error;
 331 }
 332
 333 /*
 334  * Called from xfs_bmap_add_attrfork to handle extents format files.
 335  */
 336 STATIC int                                      /* error */
 337 xfs_bmap_add_attrfork_extents(
 338         xfs_trans_t             *tp,            /* transaction pointer */
 339         xfs_inode_t             *ip,            /* incore inode pointer */
 340         xfs_fsblock_t           *firstblock,    /* first block allocated */
 341         xfs_bmap_free_t         *flist,         /* blocks to free at commit */
 342         int                     *flags)         /* inode logging flags */
 343 {
 344         xfs_btree_cur_t         *cur;           /* bmap btree cursor */
 345         int                     error;          /* error return value */
 346
 347         if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
 348                 return 0;
 349         cur = NULL;
 350         error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
 351                 flags, XFS_DATA_FORK);
 352         if (cur) {
 353                 cur->bc_private.b.allocated = 0;
 354                 xfs_btree_del_cursor(cur,
 355                         error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
 356         }
 357         return error;
 358 }
 359
 360 /*
 361  * Called from xfs_bmap_add_attrfork to handle local format files.
 362  */
 363 STATIC int                                      /* error */
 364 xfs_bmap_add_attrfork_local(
 365         xfs_trans_t             *tp,            /* transaction pointer */
 366         xfs_inode_t             *ip,            /* incore inode pointer */
 367         xfs_fsblock_t           *firstblock,    /* first block allocated */
 368         xfs_bmap_free_t         *flist,         /* blocks to free at commit */
 369         int                     *flags)         /* inode logging flags */
 370 {
 371         xfs_da_args_t           dargs;          /* args for dir/attr code */
 372         int                     error;          /* error return value */
 373         xfs_mount_t             *mp;            /* mount structure pointer */
 374
 375         if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
 376                 return 0;
 377         if (S_ISDIR(ip->i_d.di_mode)) {
 378                 mp = ip->i_mount;
 379                 memset(&dargs, 0, sizeof(dargs));
 380                 dargs.dp = ip;
 381                 dargs.firstblock = firstblock;
 382                 dargs.flist = flist;
 383                 dargs.total = mp->m_dirblkfsbs;
 384                 dargs.whichfork = XFS_DATA_FORK;
 385                 dargs.trans = tp;
 386                 error = xfs_dir2_sf_to_block(&dargs);
 387         } else
 388                 error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
 389                         XFS_DATA_FORK);
 390         return error;
 391 }
 392
 393 /*
 394  * Convert a delayed allocation to a real allocation.
 395  */
 396 STATIC int                              /* error */
 397 xfs_bmap_add_extent_delay_real(
 398         struct xfs_bmalloca     *bma)
 399 {
 400         struct xfs_bmbt_irec    *new = &bma->got;
 401         int                     diff;   /* temp value */
 402         xfs_bmbt_rec_host_t     *ep;    /* extent entry for idx */
 403         int                     error;  /* error return value */
 404         int                     i;      /* temp state */
 405         xfs_ifork_t             *ifp;   /* inode fork pointer */
 406         xfs_fileoff_t           new_endoff;     /* end offset of new entry */
 407         xfs_bmbt_irec_t         r[3];   /* neighbor extent entries */
 408                                         /* left is 0, right is 1, prev is 2 */
 409         int                     rval=0; /* return value (logging flags) */
 410         int                     state = 0;/* state bits, accessed thru macros */
 411         xfs_filblks_t           da_new; /* new count del alloc blocks used */
 412         xfs_filblks_t           da_old; /* old count del alloc blocks used */
 413         xfs_filblks_t           temp=0; /* value for da_new calculations */
 414         xfs_filblks_t           temp2=0;/* value for da_new calculations */
 415         int                     tmp_rval;       /* partial logging flags */
 416
 417         ifp = XFS_IFORK_PTR(bma->ip, XFS_DATA_FORK);
 418
 419         ASSERT(bma->idx >= 0);
 420         ASSERT(bma->idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
 421         ASSERT(!isnullstartblock(new->br_startblock));
 422         ASSERT(!bma->cur ||
 423                (bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
 424
 425         XFS_STATS_INC(xs_add_exlist);
 426
 427 #define LEFT            r[0]
 428 #define RIGHT           r[1]
 429 #define PREV            r[2]
 430
 431         /*
 432          * Set up a bunch of variables to make the tests simpler.
 433          */
 434         ep = xfs_iext_get_ext(ifp, bma->idx);
 435         xfs_bmbt_get_all(ep, &PREV);
 436         new_endoff = new->br_startoff + new->br_blockcount;
 437         ASSERT(PREV.br_startoff <= new->br_startoff);
 438         ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
 439
 440         da_old = startblockval(PREV.br_startblock);
 441         da_new = 0;
 442
 443         /*
 444          * Set flags determining what part of the previous delayed allocation
 445          * extent is being replaced by a real allocation.
 446          */
 447         if (PREV.br_startoff == new->br_startoff)
 448                 state |= BMAP_LEFT_FILLING;
 449         if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
 450                 state |= BMAP_RIGHT_FILLING;
 451
 452         /*
 453          * Check and set flags if this segment has a left neighbor.
 454          * Don't set contiguous if the combined extent would be too large.
 455          */
 456         if (bma->idx > 0) {
 457                 state |= BMAP_LEFT_VALID;
 458                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &LEFT);
 459
 460                 if (isnullstartblock(LEFT.br_startblock))
 461                         state |= BMAP_LEFT_DELAY;
 462         }
 463
 464         if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
 465             LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
 466             LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
 467             LEFT.br_state == new->br_state &&
 468             LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
 469                 state |= BMAP_LEFT_CONTIG;
 470
 471         /*
 472          * Check and set flags if this segment has a right neighbor.
 473          * Don't set contiguous if the combined extent would be too large.
 474          * Also check for all-three-contiguous being too large.
 475          */
 476         if (bma->idx < bma->ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
 477                 state |= BMAP_RIGHT_VALID;
 478                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx + 1), &RIGHT);
 479
 480                 if (isnullstartblock(RIGHT.br_startblock))
 481                         state |= BMAP_RIGHT_DELAY;
 482         }
 483
 484         if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
 485             new_endoff == RIGHT.br_startoff &&
 486             new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
 487             new->br_state == RIGHT.br_state &&
 488             new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
 489             ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
 490                        BMAP_RIGHT_FILLING)) !=
 491                       (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
 492                        BMAP_RIGHT_FILLING) ||
 493              LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
 494                         <= MAXEXTLEN))
 495                 state |= BMAP_RIGHT_CONTIG;
 496
 497         error = 0;
 498         /*
 499          * Switch out based on the FILLING and CONTIG state bits.
 500          */
 501         switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
 502                          BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
 503         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
 504              BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
 505                 /*
 506                  * Filling in all of a previously delayed allocation extent.
 507                  * The left and right neighbors are both contiguous with new.
 508                  */
 509                 bma->idx--;
 510                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
 511                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
 512                         LEFT.br_blockcount + PREV.br_blockcount +
 513                         RIGHT.br_blockcount);
 514                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
 515
 516                 xfs_iext_remove(bma->ip, bma->idx + 1, 2, state);
 517                 bma->ip->i_d.di_nextents--;
 518                 if (bma->cur == NULL)
 519                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
 520                 else {
 521                         rval = XFS_ILOG_CORE;
 522                         error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
 523                                         RIGHT.br_startblock,
 524                                         RIGHT.br_blockcount, &i);
 525                         if (error)
 526                                 goto done;
 527                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
 528                         error = xfs_btree_delete(bma->cur, &i);
 529                         if (error)
 530                                 goto done;
 531                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
 532                         error = xfs_btree_decrement(bma->cur, 0, &i);
 533                         if (error)
 534                                 goto done;
 535                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
 536                         error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
 537                                         LEFT.br_startblock,
 538                                         LEFT.br_blockcount +
 539                                         PREV.br_blockcount +
 540                                         RIGHT.br_blockcount, LEFT.br_state);
 541                         if (error)
 542                                 goto done;
 543                 }
 544                 break;
 545
 546         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
 547                 /*
 548                  * Filling in all of a previously delayed allocation extent.
 549                  * The left neighbor is contiguous, the right is not.
 550                  */
 551                 bma->idx--;
 552
 553                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
 554                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
 555                         LEFT.br_blockcount + PREV.br_blockcount);
 556                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
 557
 558                 xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
 559                 if (bma->cur == NULL)
 560                         rval = XFS_ILOG_DEXT;
 561                 else {
 562                         rval = 0;
 563                         error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
 564                                         LEFT.br_startblock, LEFT.br_blockcount,
 565                                         &i);
 566                         if (error)
 567                                 goto done;
 568                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
 569                         error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
 570                                         LEFT.br_startblock,
 571                                         LEFT.br_blockcount +
 572                                         PREV.br_blockcount, LEFT.br_state);
 573                         if (error)
 574                                 goto done;
 575                 }
 576                 break;
 577
 578         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
 579                 /*
 580                  * Filling in all of a previously delayed allocation extent.
 581                  * The right neighbor is contiguous, the left is not.
 582                  */
 583                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
 584                 xfs_bmbt_set_startblock(ep, new->br_startblock);
 585                 xfs_bmbt_set_blockcount(ep,
 586                         PREV.br_blockcount + RIGHT.br_blockcount);
 587                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
 588
 589                 xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
 590                 if (bma->cur == NULL)
 591                         rval = XFS_ILOG_DEXT;
 592                 else {
 593                         rval = 0;
 594                         error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
 595                                         RIGHT.br_startblock,
 596                                         RIGHT.br_blockcount, &i);
 597                         if (error)
 598                                 goto done;
 599                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
 600                         error = xfs_bmbt_update(bma->cur, PREV.br_startoff,
 601                                         new->br_startblock,
 602                                         PREV.br_blockcount +
 603                                         RIGHT.br_blockcount, PREV.br_state);
 604                         if (error)
 605                                 goto done;
 606                 }
 607                 break;
 608
 609         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
 610                 /*
 611                  * Filling in all of a previously delayed allocation extent.
 612                  * Neither the left nor right neighbors are contiguous with
 613                  * the new one.
 614                  */
 615                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
 616                 xfs_bmbt_set_startblock(ep, new->br_startblock);
 617                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
 618
 619                 bma->ip->i_d.di_nextents++;
 620                 if (bma->cur == NULL)
 621                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
 622                 else {
 623                         rval = XFS_ILOG_CORE;
 624                         error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
 625                                         new->br_startblock, new->br_blockcount,
 626                                         &i);
 627                         if (error)
 628                                 goto done;
 629                         XFS_WANT_CORRUPTED_GOTO(i == 0, done);
 630                         bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
 631                         error = xfs_btree_insert(bma->cur, &i);
 632                         if (error)
 633                                 goto done;
 634                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
 635                 }
 636                 break;
 637
 638         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
 639                 /*
 640                  * Filling in the first part of a previous delayed allocation.
 641                  * The left neighbor is contiguous.
 642                  */
 643                 trace_xfs_bmap_pre_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
 644                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx - 1),
 645                         LEFT.br_blockcount + new->br_blockcount);
 646                 xfs_bmbt_set_startoff(ep,
 647                         PREV.br_startoff + new->br_blockcount);
 648                 trace_xfs_bmap_post_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
 649
 650                 temp = PREV.br_blockcount - new->br_blockcount;
 651                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
 652                 xfs_bmbt_set_blockcount(ep, temp);
 653                 if (bma->cur == NULL)
 654                         rval = XFS_ILOG_DEXT;
 655                 else {
 656                         rval = 0;
 657                         error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
 658                                         LEFT.br_startblock, LEFT.br_blockcount,
 659                                         &i);
 660                         if (error)
 661                                 goto done;
 662                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
 663                         error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
 664                                         LEFT.br_startblock,
 665                                         LEFT.br_blockcount +
 666                                         new->br_blockcount,
 667                                         LEFT.br_state);
 668                         if (error)
 669                                 goto done;
 670                 }
 671                 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
 672                         startblockval(PREV.br_startblock));
 673                 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
 674                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
 675
 676                 bma->idx--;
 677                 break;
 678
 679         case BMAP_LEFT_FILLING:
 680                 /*
 681                  * Filling in the first part of a previous delayed allocation.
 682                  * The left neighbor is not contiguous.
 683                  */
 684                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
 685                 xfs_bmbt_set_startoff(ep, new_endoff);
 686                 temp = PREV.br_blockcount - new->br_blockcount;
 687                 xfs_bmbt_set_blockcount(ep, temp);
 688                 xfs_iext_insert(bma->ip, bma->idx, 1, new, state);
 689                 bma->ip->i_d.di_nextents++;
 690                 if (bma->cur == NULL)
 691                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
 692                 else {
 693                         rval = XFS_ILOG_CORE;
 694                         error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
 695                                         new->br_startblock, new->br_blockcount,
 696                                         &i);
 697                         if (error)
 698                                 goto done;
 699                         XFS_WANT_CORRUPTED_GOTO(i == 0, done);
 700                         bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
 701                         error = xfs_btree_insert(bma->cur, &i);
 702                         if (error)
 703                                 goto done;
 704                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
 705                 }
 706
 707                 if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
 708                         error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
 709                                         bma->firstblock, bma->flist,
 710                                         &bma->cur, 1, &tmp_rval, XFS_DATA_FORK);
 711                         rval |= tmp_rval;
 712                         if (error)
 713                                 goto done;
 714                 }
 715                 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
 716                         startblockval(PREV.br_startblock) -
 717                         (bma->cur ? bma->cur->bc_private.b.allocated : 0));
 718                 ep = xfs_iext_get_ext(ifp, bma->idx + 1);
 719                 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
 720                 trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
 721                 break;
 722
 723         case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
 724                 /*
 725                  * Filling in the last part of a previous delayed allocation.
 726                  * The right neighbor is contiguous with the new allocation.
 727                  */
 728                 temp = PREV.br_blockcount - new->br_blockcount;
 729                 trace_xfs_bmap_pre_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
 730                 xfs_bmbt_set_blockcount(ep, temp);
 731                 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx + 1),
 732                         new->br_startoff, new->br_startblock,
 733                         new->br_blockcount + RIGHT.br_blockcount,
 734                         RIGHT.br_state);
 735                 trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
 736                 if (bma->cur == NULL)
 737                         rval = XFS_ILOG_DEXT;
 738                 else {
 739                         rval = 0;
 740                         error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
 741                                         RIGHT.br_startblock,
 742                                         RIGHT.br_blockcount, &i);
 743                         if (error)
 744                                 goto done;
 745                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
 746                         error = xfs_bmbt_update(bma->cur, new->br_startoff,
 747                                         new->br_startblock,
 748                                         new->br_blockcount +
 749                                         RIGHT.br_blockcount,
 750                                         RIGHT.br_state);
 751                         if (error)
 752                                 goto done;
 753                 }
 754
 755                 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
 756                         startblockval(PREV.br_startblock));
 757                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
 758                 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
 759                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
 760
 761                 bma->idx++;
 762                 break;
 763
 764         case BMAP_RIGHT_FILLING:
 765                 /*
 766                  * Filling in the last part of a previous delayed allocation.
 767                  * The right neighbor is not contiguous.
 768                  */
 769                 temp = PREV.br_blockcount - new->br_blockcount;
 770                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
 771                 xfs_bmbt_set_blockcount(ep, temp);
 772                 xfs_iext_insert(bma->ip, bma->idx + 1, 1, new, state);
 773                 bma->ip->i_d.di_nextents++;
 774                 if (bma->cur == NULL)
 775                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
 776                 else {
 777                         rval = XFS_ILOG_CORE;
 778                         error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
 779                                         new->br_startblock, new->br_blockcount,
 780                                         &i);
 781                         if (error)
 782                                 goto done;
 783                         XFS_WANT_CORRUPTED_GOTO(i == 0, done);
 784                         bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
 785                         error = xfs_btree_insert(bma->cur, &i);
 786                         if (error)
 787                                 goto done;
 788                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
 789                 }
 790
 791                 if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
 792                         error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
 793                                 bma->firstblock, bma->flist, &bma->cur, 1,
 794                                 &tmp_rval, XFS_DATA_FORK);
 795                         rval |= tmp_rval;
 796                         if (error)
 797                                 goto done;
 798                 }
 799                 da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
 800                         startblockval(PREV.br_startblock) -
 801                         (bma->cur ? bma->cur->bc_private.b.allocated : 0));
 802                 ep = xfs_iext_get_ext(ifp, bma->idx);
 803                 xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
 804                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
 805
 806                 bma->idx++;
 807                 break;
 808
 809         case 0:
 810                 /*
 811                  * Filling in the middle part of a previous delayed allocation.
 812                  * Contiguity is impossible here.
 813                  * This case is avoided almost all the time.
 814                  *
 815                  * We start with a delayed allocation:
 816                  *
 817                  * +ddddddddddddddddddddddddddddddddddddddddddddddddddddddd+
 818                  *  PREV @ idx
 819                  *
 820                  * and we are allocating:
 821                  *                     +rrrrrrrrrrrrrrrrr+
 822                  *                            new
 823                  *
 824                  * and we set it up for insertion as:
 825                  * +ddddddddddddddddddd+rrrrrrrrrrrrrrrrr+ddddddddddddddddd+
 826                  *                            new
 827                  *  PREV @ idx          LEFT              RIGHT
 828                  *                      inserted at idx + 1
 829                  */
 830                 temp = new->br_startoff - PREV.br_startoff;
 831                 temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
 832                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, 0, _THIS_IP_);
 833                 xfs_bmbt_set_blockcount(ep, temp);      /* truncate PREV */
 834                 LEFT = *new;
 835                 RIGHT.br_state = PREV.br_state;
 836                 RIGHT.br_startblock = nullstartblock(
 837                                 (int)xfs_bmap_worst_indlen(bma->ip, temp2));
 838                 RIGHT.br_startoff = new_endoff;
 839                 RIGHT.br_blockcount = temp2;
 840                 /* insert LEFT (r[0]) and RIGHT (r[1]) at the same time */
 841                 xfs_iext_insert(bma->ip, bma->idx + 1, 2, &LEFT, state);
 842                 bma->ip->i_d.di_nextents++;
 843                 if (bma->cur == NULL)
 844                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
 845                 else {
 846                         rval = XFS_ILOG_CORE;
 847                         error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff,
 848                                         new->br_startblock, new->br_blockcount,
 849                                         &i);
 850                         if (error)
 851                                 goto done;
 852                         XFS_WANT_CORRUPTED_GOTO(i == 0, done);
 853                         bma->cur->bc_rec.b.br_state = XFS_EXT_NORM;
 854                         error = xfs_btree_insert(bma->cur, &i);
 855                         if (error)
 856                                 goto done;
 857                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
 858                 }
 859
 860                 if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
 861                         error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
 862                                         bma->firstblock, bma->flist, &bma->cur,
 863                                         1, &tmp_rval, XFS_DATA_FORK);
 864                         rval |= tmp_rval;
 865                         if (error)
 866                                 goto done;
 867                 }
 868                 temp = xfs_bmap_worst_indlen(bma->ip, temp);
 869                 temp2 = xfs_bmap_worst_indlen(bma->ip, temp2);
 870                 diff = (int)(temp + temp2 - startblockval(PREV.br_startblock) -
 871                         (bma->cur ? bma->cur->bc_private.b.allocated : 0));
 872                 if (diff > 0) {
 873                         error = xfs_icsb_modify_counters(bma->ip->i_mount,
 874                                         XFS_SBS_FDBLOCKS,
 875                                         -((int64_t)diff), 0);
 876                         ASSERT(!error);
 877                         if (error)
 878                                 goto done;
 879                 }
 880
 881                 ep = xfs_iext_get_ext(ifp, bma->idx);
 882                 xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
 883                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
 884                 trace_xfs_bmap_pre_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
 885                 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, bma->idx + 2),
 886                         nullstartblock((int)temp2));
 887                 trace_xfs_bmap_post_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
 888
 889                 bma->idx++;
 890                 da_new = temp + temp2;
 891                 break;
 892
 893         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
 894         case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
 895         case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
 896         case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
 897         case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
 898         case BMAP_LEFT_CONTIG:
 899         case BMAP_RIGHT_CONTIG:
 900                 /*
 901                  * These cases are all impossible.
 902                  */
 903                 ASSERT(0);
 904         }
 905
 906         /* convert to a btree if necessary */
 907         if (xfs_bmap_needs_btree(bma->ip, XFS_DATA_FORK)) {
 908                 int     tmp_logflags;   /* partial log flag return val */
 909
 910                 ASSERT(bma->cur == NULL);
 911                 error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
 912                                 bma->firstblock, bma->flist, &bma->cur,
 913                                 da_old > 0, &tmp_logflags, XFS_DATA_FORK);
 914                 bma->logflags |= tmp_logflags;
 915                 if (error)
 916                         goto done;
 917         }
 918
 919         /* adjust for changes in reserved delayed indirect blocks */
 920         if (da_old || da_new) {
 921                 temp = da_new;
 922                 if (bma->cur)
 923                         temp += bma->cur->bc_private.b.allocated;
 924                 ASSERT(temp <= da_old);
 925                 if (temp < da_old)
 926                         xfs_icsb_modify_counters(bma->ip->i_mount,
 927                                         XFS_SBS_FDBLOCKS,
 928                                         (int64_t)(da_old - temp), 0);
 929         }
 930
 931         /* clear out the allocated field, done with it now in any case. */
 932         if (bma->cur)
 933                 bma->cur->bc_private.b.allocated = 0;
 934
 935         xfs_bmap_check_leaf_extents(bma->cur, bma->ip, XFS_DATA_FORK);
 936 done:
 937         bma->logflags |= rval;
 938         return error;
 939 #undef  LEFT
 940 #undef  RIGHT
 941 #undef  PREV
 942 }
 943
 944 /*
 945  * Convert an unwritten allocation to a real allocation or vice versa.
 946  */
 947 STATIC int                              /* error */
 948 xfs_bmap_add_extent_unwritten_real(
 949         struct xfs_trans        *tp,
 950         xfs_inode_t             *ip,    /* incore inode pointer */
 951         xfs_extnum_t            *idx,   /* extent number to update/insert */
 952         xfs_btree_cur_t         **curp, /* if *curp is null, not a btree */
 953         xfs_bmbt_irec_t         *new,   /* new data to add to file extents */
 954         xfs_fsblock_t           *first, /* pointer to firstblock variable */
 955         xfs_bmap_free_t         *flist, /* list of extents to be freed */
 956         int                     *logflagsp) /* inode logging flags */
 957 {
 958         xfs_btree_cur_t         *cur;   /* btree cursor */
 959         xfs_bmbt_rec_host_t     *ep;    /* extent entry for idx */
 960         int                     error;  /* error return value */
 961         int                     i;      /* temp state */
 962         xfs_ifork_t             *ifp;   /* inode fork pointer */
 963         xfs_fileoff_t           new_endoff;     /* end offset of new entry */
 964         xfs_exntst_t            newext; /* new extent state */
 965         xfs_exntst_t            oldext; /* old extent state */
 966         xfs_bmbt_irec_t         r[3];   /* neighbor extent entries */
 967                                         /* left is 0, right is 1, prev is 2 */
 968         int                     rval=0; /* return value (logging flags) */
 969         int                     state = 0;/* state bits, accessed thru macros */
 970
 971         *logflagsp = 0;
 972
 973         cur = *curp;
 974         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
 975
 976         ASSERT(*idx >= 0);
 977         ASSERT(*idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
 978         ASSERT(!isnullstartblock(new->br_startblock));
 979
 980         XFS_STATS_INC(xs_add_exlist);
 981
 982 #define LEFT            r[0]
 983 #define RIGHT           r[1]
 984 #define PREV            r[2]
 985
 986         /*
 987          * Set up a bunch of variables to make the tests simpler.
 988          */
 989         error = 0;
 990         ep = xfs_iext_get_ext(ifp, *idx);
 991         xfs_bmbt_get_all(ep, &PREV);
 992         newext = new->br_state;
 993         oldext = (newext == XFS_EXT_UNWRITTEN) ?
 994                 XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
 995         ASSERT(PREV.br_state == oldext);
 996         new_endoff = new->br_startoff + new->br_blockcount;
 997         ASSERT(PREV.br_startoff <= new->br_startoff);
 998         ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
 999
1000         /*
1001          * Set flags determining what part of the previous oldext allocation
1002          * extent is being replaced by a newext allocation.
1003          */
1004         if (PREV.br_startoff == new->br_startoff)
1005                 state |= BMAP_LEFT_FILLING;
1006         if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
1007                 state |= BMAP_RIGHT_FILLING;
1008
1009         /*
1010          * Check and set flags if this segment has a left neighbor.
1011          * Don't set contiguous if the combined extent would be too large.
1012          */
1013         if (*idx > 0) {
1014                 state |= BMAP_LEFT_VALID;
1015                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &LEFT);
1016
1017                 if (isnullstartblock(LEFT.br_startblock))
1018                         state |= BMAP_LEFT_DELAY;
1019         }
1020
1021         if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
1022             LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
1023             LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
1024             LEFT.br_state == newext &&
1025             LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1026                 state |= BMAP_LEFT_CONTIG;
1027
1028         /*
1029          * Check and set flags if this segment has a right neighbor.
1030          * Don't set contiguous if the combined extent would be too large.
1031          * Also check for all-three-contiguous being too large.
1032          */
1033         if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
1034                 state |= BMAP_RIGHT_VALID;
1035                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx + 1), &RIGHT);
1036                 if (isnullstartblock(RIGHT.br_startblock))
1037                         state |= BMAP_RIGHT_DELAY;
1038         }
1039
1040         if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
1041             new_endoff == RIGHT.br_startoff &&
1042             new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
1043             newext == RIGHT.br_state &&
1044             new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
1045             ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
1046                        BMAP_RIGHT_FILLING)) !=
1047                       (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
1048                        BMAP_RIGHT_FILLING) ||
1049              LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
1050                         <= MAXEXTLEN))
1051                 state |= BMAP_RIGHT_CONTIG;
1052
1053         /*
1054          * Switch out based on the FILLING and CONTIG state bits.
1055          */
1056         switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
1057                          BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
1058         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
1059              BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1060                 /*
1061                  * Setting all of a previous oldext extent to newext.
1062                  * The left and right neighbors are both contiguous with new.
1063                  */
1064                 --*idx;
1065
1066                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1067                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
1068                         LEFT.br_blockcount + PREV.br_blockcount +
1069                         RIGHT.br_blockcount);
1070                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1071
1072                 xfs_iext_remove(ip, *idx + 1, 2, state);
1073                 ip->i_d.di_nextents -= 2;
1074                 if (cur == NULL)
1075                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1076                 else {
1077                         rval = XFS_ILOG_CORE;
1078                         if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1079                                         RIGHT.br_startblock,
1080                                         RIGHT.br_blockcount, &i)))
1081                                 goto done;
1082                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1083                         if ((error = xfs_btree_delete(cur, &i)))
1084                                 goto done;
1085                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1086                         if ((error = xfs_btree_decrement(cur, 0, &i)))
1087                                 goto done;
1088                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1089                         if ((error = xfs_btree_delete(cur, &i)))
1090                                 goto done;
1091                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1092                         if ((error = xfs_btree_decrement(cur, 0, &i)))
1093                                 goto done;
1094                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1095                         if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1096                                 LEFT.br_startblock,
1097                                 LEFT.br_blockcount + PREV.br_blockcount +
1098                                 RIGHT.br_blockcount, LEFT.br_state)))
1099                                 goto done;
1100                 }
1101                 break;
1102
1103         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1104                 /*
1105                  * Setting all of a previous oldext extent to newext.
1106                  * The left neighbor is contiguous, the right is not.
1107                  */
1108                 --*idx;
1109
1110                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1111                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
1112                         LEFT.br_blockcount + PREV.br_blockcount);
1113                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1114
1115                 xfs_iext_remove(ip, *idx + 1, 1, state);
1116                 ip->i_d.di_nextents--;
1117                 if (cur == NULL)
1118                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1119                 else {
1120                         rval = XFS_ILOG_CORE;
1121                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1122                                         PREV.br_startblock, PREV.br_blockcount,
1123                                         &i)))
1124                                 goto done;
1125                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1126                         if ((error = xfs_btree_delete(cur, &i)))
1127                                 goto done;
1128                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1129                         if ((error = xfs_btree_decrement(cur, 0, &i)))
1130                                 goto done;
1131                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1132                         if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1133                                 LEFT.br_startblock,
1134                                 LEFT.br_blockcount + PREV.br_blockcount,
1135                                 LEFT.br_state)))
1136                                 goto done;
1137                 }
1138                 break;
1139
1140         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1141                 /*
1142                  * Setting all of a previous oldext extent to newext.
1143                  * The right neighbor is contiguous, the left is not.
1144                  */
1145                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1146                 xfs_bmbt_set_blockcount(ep,
1147                         PREV.br_blockcount + RIGHT.br_blockcount);
1148                 xfs_bmbt_set_state(ep, newext);
1149                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1150                 xfs_iext_remove(ip, *idx + 1, 1, state);
1151                 ip->i_d.di_nextents--;
1152                 if (cur == NULL)
1153                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1154                 else {
1155                         rval = XFS_ILOG_CORE;
1156                         if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1157                                         RIGHT.br_startblock,
1158                                         RIGHT.br_blockcount, &i)))
1159                                 goto done;
1160                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1161                         if ((error = xfs_btree_delete(cur, &i)))
1162                                 goto done;
1163                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1164                         if ((error = xfs_btree_decrement(cur, 0, &i)))
1165                                 goto done;
1166                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1167                         if ((error = xfs_bmbt_update(cur, new->br_startoff,
1168                                 new->br_startblock,
1169                                 new->br_blockcount + RIGHT.br_blockcount,
1170                                 newext)))
1171                                 goto done;
1172                 }
1173                 break;
1174
1175         case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
1176                 /*
1177                  * Setting all of a previous oldext extent to newext.
1178                  * Neither the left nor right neighbors are contiguous with
1179                  * the new one.
1180                  */
1181                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1182                 xfs_bmbt_set_state(ep, newext);
1183                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1184
1185                 if (cur == NULL)
1186                         rval = XFS_ILOG_DEXT;
1187                 else {
1188                         rval = 0;
1189                         if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1190                                         new->br_startblock, new->br_blockcount,
1191                                         &i)))
1192                                 goto done;
1193                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1194                         if ((error = xfs_bmbt_update(cur, new->br_startoff,
1195                                 new->br_startblock, new->br_blockcount,
1196                                 newext)))
1197                                 goto done;
1198                 }
1199                 break;
1200
1201         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
1202                 /*
1203                  * Setting the first part of a previous oldext extent to newext.
1204                  * The left neighbor is contiguous.
1205                  */
1206                 trace_xfs_bmap_pre_update(ip, *idx - 1, state, _THIS_IP_);
1207                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx - 1),
1208                         LEFT.br_blockcount + new->br_blockcount);
1209                 xfs_bmbt_set_startoff(ep,
1210                         PREV.br_startoff + new->br_blockcount);
1211                 trace_xfs_bmap_post_update(ip, *idx - 1, state, _THIS_IP_);
1212
1213                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1214                 xfs_bmbt_set_startblock(ep,
1215                         new->br_startblock + new->br_blockcount);
1216                 xfs_bmbt_set_blockcount(ep,
1217                         PREV.br_blockcount - new->br_blockcount);
1218                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1219
1220                 --*idx;
1221
1222                 if (cur == NULL)
1223                         rval = XFS_ILOG_DEXT;
1224                 else {
1225                         rval = 0;
1226                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1227                                         PREV.br_startblock, PREV.br_blockcount,
1228                                         &i)))
1229                                 goto done;
1230                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1231                         if ((error = xfs_bmbt_update(cur,
1232                                 PREV.br_startoff + new->br_blockcount,
1233                                 PREV.br_startblock + new->br_blockcount,
1234                                 PREV.br_blockcount - new->br_blockcount,
1235                                 oldext)))
1236                                 goto done;
1237                         if ((error = xfs_btree_decrement(cur, 0, &i)))
1238                                 goto done;
1239                         error = xfs_bmbt_update(cur, LEFT.br_startoff,
1240                                 LEFT.br_startblock,
1241                                 LEFT.br_blockcount + new->br_blockcount,
1242                                 LEFT.br_state);
1243                         if (error)
1244                                 goto done;
1245                 }
1246                 break;
1247
1248         case BMAP_LEFT_FILLING:
1249                 /*
1250                  * Setting the first part of a previous oldext extent to newext.
1251                  * The left neighbor is not contiguous.
1252                  */
1253                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1254                 ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
1255                 xfs_bmbt_set_startoff(ep, new_endoff);
1256                 xfs_bmbt_set_blockcount(ep,
1257                         PREV.br_blockcount - new->br_blockcount);
1258                 xfs_bmbt_set_startblock(ep,
1259                         new->br_startblock + new->br_blockcount);
1260                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1261
1262                 xfs_iext_insert(ip, *idx, 1, new, state);
1263                 ip->i_d.di_nextents++;
1264                 if (cur == NULL)
1265                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1266                 else {
1267                         rval = XFS_ILOG_CORE;
1268                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1269                                         PREV.br_startblock, PREV.br_blockcount,
1270                                         &i)))
1271                                 goto done;
1272                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1273                         if ((error = xfs_bmbt_update(cur,
1274                                 PREV.br_startoff + new->br_blockcount,
1275                                 PREV.br_startblock + new->br_blockcount,
1276                                 PREV.br_blockcount - new->br_blockcount,
1277                                 oldext)))
1278                                 goto done;
1279                         cur->bc_rec.b = *new;
1280                         if ((error = xfs_btree_insert(cur, &i)))
1281                                 goto done;
1282                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1283                 }
1284                 break;
1285
1286         case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
1287                 /*
1288                  * Setting the last part of a previous oldext extent to newext.
1289                  * The right neighbor is contiguous with the new allocation.
1290                  */
1291                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1292                 xfs_bmbt_set_blockcount(ep,
1293                         PREV.br_blockcount - new->br_blockcount);
1294                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1295
1296                 ++*idx;
1297
1298                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1299                 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
1300                         new->br_startoff, new->br_startblock,
1301                         new->br_blockcount + RIGHT.br_blockcount, newext);
1302                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1303
1304                 if (cur == NULL)
1305                         rval = XFS_ILOG_DEXT;
1306                 else {
1307                         rval = 0;
1308                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1309                                         PREV.br_startblock,
1310                                         PREV.br_blockcount, &i)))
1311                                 goto done;
1312                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1313                         if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1314                                 PREV.br_startblock,
1315                                 PREV.br_blockcount - new->br_blockcount,
1316                                 oldext)))
1317                                 goto done;
1318                         if ((error = xfs_btree_increment(cur, 0, &i)))
1319                                 goto done;
1320                         if ((error = xfs_bmbt_update(cur, new->br_startoff,
1321                                 new->br_startblock,
1322                                 new->br_blockcount + RIGHT.br_blockcount,
1323                                 newext)))
1324                                 goto done;
1325                 }
1326                 break;
1327
1328         case BMAP_RIGHT_FILLING:
1329                 /*
1330                  * Setting the last part of a previous oldext extent to newext.
1331                  * The right neighbor is not contiguous.
1332                  */
1333                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1334                 xfs_bmbt_set_blockcount(ep,
1335                         PREV.br_blockcount - new->br_blockcount);
1336                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1337
1338                 ++*idx;
1339                 xfs_iext_insert(ip, *idx, 1, new, state);
1340
1341                 ip->i_d.di_nextents++;
1342                 if (cur == NULL)
1343                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1344                 else {
1345                         rval = XFS_ILOG_CORE;
1346                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1347                                         PREV.br_startblock, PREV.br_blockcount,
1348                                         &i)))
1349                                 goto done;
1350                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1351                         if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1352                                 PREV.br_startblock,
1353                                 PREV.br_blockcount - new->br_blockcount,
1354                                 oldext)))
1355                                 goto done;
1356                         if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1357                                         new->br_startblock, new->br_blockcount,
1358                                         &i)))
1359                                 goto done;
1360                         XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1361                         cur->bc_rec.b.br_state = XFS_EXT_NORM;
1362                         if ((error = xfs_btree_insert(cur, &i)))
1363                                 goto done;
1364                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1365                 }
1366                 break;
1367
1368         case 0:
1369                 /*
1370                  * Setting the middle part of a previous oldext extent to
1371                  * newext.  Contiguity is impossible here.
1372                  * One extent becomes three extents.
1373                  */
1374                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1375                 xfs_bmbt_set_blockcount(ep,
1376                         new->br_startoff - PREV.br_startoff);
1377                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1378
1379                 r[0] = *new;
1380                 r[1].br_startoff = new_endoff;
1381                 r[1].br_blockcount =
1382                         PREV.br_startoff + PREV.br_blockcount - new_endoff;
1383                 r[1].br_startblock = new->br_startblock + new->br_blockcount;
1384                 r[1].br_state = oldext;
1385
1386                 ++*idx;
1387                 xfs_iext_insert(ip, *idx, 2, &r[0], state);
1388
1389                 ip->i_d.di_nextents += 2;
1390                 if (cur == NULL)
1391                         rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1392                 else {
1393                         rval = XFS_ILOG_CORE;
1394                         if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1395                                         PREV.br_startblock, PREV.br_blockcount,
1396                                         &i)))
1397                                 goto done;
1398                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1399                         /* new right extent - oldext */
1400                         if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
1401                                 r[1].br_startblock, r[1].br_blockcount,
1402                                 r[1].br_state)))
1403                                 goto done;
1404                         /* new left extent - oldext */
1405                         cur->bc_rec.b = PREV;
1406                         cur->bc_rec.b.br_blockcount =
1407                                 new->br_startoff - PREV.br_startoff;
1408                         if ((error = xfs_btree_insert(cur, &i)))
1409                                 goto done;
1410                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1411                         /*
1412                          * Reset the cursor to the position of the new extent
1413                          * we are about to insert as we can't trust it after
1414                          * the previous insert.
1415                          */
1416                         if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1417                                         new->br_startblock, new->br_blockcount,
1418                                         &i)))
1419                                 goto done;
1420                         XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1421                         /* new middle extent - newext */
1422                         cur->bc_rec.b.br_state = new->br_state;
1423                         if ((error = xfs_btree_insert(cur, &i)))
1424                                 goto done;
1425                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1426                 }
1427                 break;
1428
1429         case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1430         case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1431         case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
1432         case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
1433         case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1434         case BMAP_LEFT_CONTIG:
1435         case BMAP_RIGHT_CONTIG:
1436                 /*
1437                  * These cases are all impossible.
1438                  */
1439                 ASSERT(0);
1440         }
1441
1442         /* convert to a btree if necessary */
1443         if (xfs_bmap_needs_btree(ip, XFS_DATA_FORK)) {
1444                 int     tmp_logflags;   /* partial log flag return val */
1445
1446                 ASSERT(cur == NULL);
1447                 error = xfs_bmap_extents_to_btree(tp, ip, first, flist, &cur,
1448                                 0, &tmp_logflags, XFS_DATA_FORK);
1449                 *logflagsp |= tmp_logflags;
1450                 if (error)
1451                         goto done;
1452         }
1453
1454         /* clear out the allocated field, done with it now in any case. */
1455         if (cur) {
1456                 cur->bc_private.b.allocated = 0;
1457                 *curp = cur;
1458         }
1459
1460         xfs_bmap_check_leaf_extents(*curp, ip, XFS_DATA_FORK);
1461 done:
1462         *logflagsp |= rval;
1463         return error;
1464 #undef  LEFT
1465 #undef  RIGHT
1466 #undef  PREV
1467 }
1468
1469 /*
1470  * Convert a hole to a delayed allocation.
1471  */
1472 STATIC void
1473 xfs_bmap_add_extent_hole_delay(
1474         xfs_inode_t             *ip,    /* incore inode pointer */
1475         xfs_extnum_t            *idx,   /* extent number to update/insert */
1476         xfs_bmbt_irec_t         *new)   /* new data to add to file extents */
1477 {
1478         xfs_ifork_t             *ifp;   /* inode fork pointer */
1479         xfs_bmbt_irec_t         left;   /* left neighbor extent entry */
1480         xfs_filblks_t           newlen=0;       /* new indirect size */
1481         xfs_filblks_t           oldlen=0;       /* old indirect size */
1482         xfs_bmbt_irec_t         right;  /* right neighbor extent entry */
1483         int                     state;  /* state bits, accessed thru macros */
1484         xfs_filblks_t           temp=0; /* temp for indirect calculations */
1485
1486         ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1487         state = 0;
1488         ASSERT(isnullstartblock(new->br_startblock));
1489
1490         /*
1491          * Check and set flags if this segment has a left neighbor
1492          */
1493         if (*idx > 0) {
1494                 state |= BMAP_LEFT_VALID;
1495                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &left);
1496
1497                 if (isnullstartblock(left.br_startblock))
1498                         state |= BMAP_LEFT_DELAY;
1499         }
1500
1501         /*
1502          * Check and set flags if the current (right) segment exists.
1503          * If it doesn't exist, we're converting the hole at end-of-file.
1504          */
1505         if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
1506                 state |= BMAP_RIGHT_VALID;
1507                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right);
1508
1509                 if (isnullstartblock(right.br_startblock))
1510                         state |= BMAP_RIGHT_DELAY;
1511         }
1512
1513         /*
1514          * Set contiguity flags on the left and right neighbors.
1515          * Don't let extents get too large, even if the pieces are contiguous.
1516          */
1517         if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) &&
1518             left.br_startoff + left.br_blockcount == new->br_startoff &&
1519             left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1520                 state |= BMAP_LEFT_CONTIG;
1521
1522         if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) &&
1523             new->br_startoff + new->br_blockcount == right.br_startoff &&
1524             new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1525             (!(state & BMAP_LEFT_CONTIG) ||
1526              (left.br_blockcount + new->br_blockcount +
1527               right.br_blockcount <= MAXEXTLEN)))
1528                 state |= BMAP_RIGHT_CONTIG;
1529
1530         /*
1531          * Switch out based on the contiguity flags.
1532          */
1533         switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
1534         case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1535                 /*
1536                  * New allocation is contiguous with delayed allocations
1537                  * on the left and on the right.
1538                  * Merge all three into a single extent record.
1539                  */
1540                 --*idx;
1541                 temp = left.br_blockcount + new->br_blockcount +
1542                         right.br_blockcount;
1543
1544                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1545                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
1546                 oldlen = startblockval(left.br_startblock) +
1547                         startblockval(new->br_startblock) +
1548                         startblockval(right.br_startblock);
1549                 newlen = xfs_bmap_worst_indlen(ip, temp);
1550                 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
1551                         nullstartblock((int)newlen));
1552                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1553
1554                 xfs_iext_remove(ip, *idx + 1, 1, state);
1555                 break;
1556
1557         case BMAP_LEFT_CONTIG:
1558                 /*
1559                  * New allocation is contiguous with a delayed allocation
1560                  * on the left.
1561                  * Merge the new allocation with the left neighbor.
1562                  */
1563                 --*idx;
1564                 temp = left.br_blockcount + new->br_blockcount;
1565
1566                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1567                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp);
1568                 oldlen = startblockval(left.br_startblock) +
1569                         startblockval(new->br_startblock);
1570                 newlen = xfs_bmap_worst_indlen(ip, temp);
1571                 xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx),
1572                         nullstartblock((int)newlen));
1573                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1574                 break;
1575
1576         case BMAP_RIGHT_CONTIG:
1577                 /*
1578                  * New allocation is contiguous with a delayed allocation
1579                  * on the right.
1580                  * Merge the new allocation with the right neighbor.
1581                  */
1582                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
1583                 temp = new->br_blockcount + right.br_blockcount;
1584                 oldlen = startblockval(new->br_startblock) +
1585                         startblockval(right.br_startblock);
1586                 newlen = xfs_bmap_worst_indlen(ip, temp);
1587                 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
1588                         new->br_startoff,
1589                         nullstartblock((int)newlen), temp, right.br_state);
1590                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
1591                 break;
1592
1593         case 0:
1594                 /*
1595                  * New allocation is not contiguous with another
1596                  * delayed allocation.
1597                  * Insert a new entry.
1598                  */
1599                 oldlen = newlen = 0;
1600                 xfs_iext_insert(ip, *idx, 1, new, state);
1601                 break;
1602         }
1603         if (oldlen != newlen) {
1604                 ASSERT(oldlen > newlen);
1605                 xfs_icsb_modify_counters(ip->i_mount, XFS_SBS_FDBLOCKS,
1606                         (int64_t)(oldlen - newlen), 0);
1607                 /*
1608                  * Nothing to do for disk quota accounting here.
1609                  */
1610         }
1611 }
1612
1613 /*
1614  * Convert a hole to a real allocation.
1615  */
1616 STATIC int                              /* error */
1617 xfs_bmap_add_extent_hole_real(
1618         struct xfs_bmalloca     *bma,
1619         int                     whichfork)
1620 {
1621         struct xfs_bmbt_irec    *new = &bma->got;
1622         int                     error;  /* error return value */
1623         int                     i;      /* temp state */
1624         xfs_ifork_t             *ifp;   /* inode fork pointer */
1625         xfs_bmbt_irec_t         left;   /* left neighbor extent entry */
1626         xfs_bmbt_irec_t         right;  /* right neighbor extent entry */
1627         int                     rval=0; /* return value (logging flags) */
1628         int                     state;  /* state bits, accessed thru macros */
1629
1630         ifp = XFS_IFORK_PTR(bma->ip, whichfork);
1631
1632         ASSERT(bma->idx >= 0);
1633         ASSERT(bma->idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec));
1634         ASSERT(!isnullstartblock(new->br_startblock));
1635         ASSERT(!bma->cur ||
1636                !(bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL));
1637
1638         XFS_STATS_INC(xs_add_exlist);
1639
1640         state = 0;
1641         if (whichfork == XFS_ATTR_FORK)
1642                 state |= BMAP_ATTRFORK;
1643
1644         /*
1645          * Check and set flags if this segment has a left neighbor.
1646          */
1647         if (bma->idx > 0) {
1648                 state |= BMAP_LEFT_VALID;
1649                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &left);
1650                 if (isnullstartblock(left.br_startblock))
1651                         state |= BMAP_LEFT_DELAY;
1652         }
1653
1654         /*
1655          * Check and set flags if this segment has a current value.
1656          * Not true if we're inserting into the "hole" at eof.
1657          */
1658         if (bma->idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
1659                 state |= BMAP_RIGHT_VALID;
1660                 xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &right);
1661                 if (isnullstartblock(right.br_startblock))
1662                         state |= BMAP_RIGHT_DELAY;
1663         }
1664
1665         /*
1666          * We're inserting a real allocation between "left" and "right".
1667          * Set the contiguity flags.  Don't let extents get too large.
1668          */
1669         if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
1670             left.br_startoff + left.br_blockcount == new->br_startoff &&
1671             left.br_startblock + left.br_blockcount == new->br_startblock &&
1672             left.br_state == new->br_state &&
1673             left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
1674                 state |= BMAP_LEFT_CONTIG;
1675
1676         if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
1677             new->br_startoff + new->br_blockcount == right.br_startoff &&
1678             new->br_startblock + new->br_blockcount == right.br_startblock &&
1679             new->br_state == right.br_state &&
1680             new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1681             (!(state & BMAP_LEFT_CONTIG) ||
1682              left.br_blockcount + new->br_blockcount +
1683              right.br_blockcount <= MAXEXTLEN))
1684                 state |= BMAP_RIGHT_CONTIG;
1685
1686         error = 0;
1687         /*
1688          * Select which case we're in here, and implement it.
1689          */
1690         switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
1691         case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
1692                 /*
1693                  * New allocation is contiguous with real allocations on the
1694                  * left and on the right.
1695                  * Merge all three into a single extent record.
1696                  */
1697                 --bma->idx;
1698                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1699                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
1700                         left.br_blockcount + new->br_blockcount +
1701                         right.br_blockcount);
1702                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1703
1704                 xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
1705
1706                 XFS_IFORK_NEXT_SET(bma->ip, whichfork,
1707                         XFS_IFORK_NEXTENTS(bma->ip, whichfork) - 1);
1708                 if (bma->cur == NULL) {
1709                         rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
1710                 } else {
1711                         rval = XFS_ILOG_CORE;
1712                         error = xfs_bmbt_lookup_eq(bma->cur, right.br_startoff,
1713                                         right.br_startblock, right.br_blockcount,
1714                                         &i);
1715                         if (error)
1716                                 goto done;
1717                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1718                         error = xfs_btree_delete(bma->cur, &i);
1719                         if (error)
1720                                 goto done;
1721                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1722                         error = xfs_btree_decrement(bma->cur, 0, &i);
1723                         if (error)
1724                                 goto done;
1725                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1726                         error = xfs_bmbt_update(bma->cur, left.br_startoff,
1727                                         left.br_startblock,
1728                                         left.br_blockcount +
1729                                                 new->br_blockcount +
1730                                                 right.br_blockcount,
1731                                         left.br_state);
1732                         if (error)
1733                                 goto done;
1734                 }
1735                 break;
1736
1737         case BMAP_LEFT_CONTIG:
1738                 /*
1739                  * New allocation is contiguous with a real allocation
1740                  * on the left.
1741                  * Merge the new allocation with the left neighbor.
1742                  */
1743                 --bma->idx;
1744                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1745                 xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
1746                         left.br_blockcount + new->br_blockcount);
1747                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1748
1749                 if (bma->cur == NULL) {
1750                         rval = xfs_ilog_fext(whichfork);
1751                 } else {
1752                         rval = 0;
1753                         error = xfs_bmbt_lookup_eq(bma->cur, left.br_startoff,
1754                                         left.br_startblock, left.br_blockcount,
1755                                         &i);
1756                         if (error)
1757                                 goto done;
1758                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1759                         error = xfs_bmbt_update(bma->cur, left.br_startoff,
1760                                         left.br_startblock,
1761                                         left.br_blockcount +
1762                                                 new->br_blockcount,
1763                                         left.br_state);
1764                         if (error)
1765                                 goto done;
1766                 }
1767                 break;
1768
1769         case BMAP_RIGHT_CONTIG:
1770                 /*
1771                  * New allocation is contiguous with a real allocation
1772                  * on the right.
1773                  * Merge the new allocation with the right neighbor.
1774                  */
1775                 trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
1776                 xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx),
1777                         new->br_startoff, new->br_startblock,
1778                         new->br_blockcount + right.br_blockcount,
1779                         right.br_state);
1780                 trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
1781
1782                 if (bma->cur == NULL) {
1783                         rval = xfs_ilog_fext(whichfork);
1784                 } else {
1785                         rval = 0;
1786                         error = xfs_bmbt_lookup_eq(bma->cur,
1787                                         right.br_startoff,
1788                                         right.br_startblock,
1789                                         right.br_blockcount, &i);
1790                         if (error)
1791                                 goto done;
1792                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1793                         error = xfs_bmbt_update(bma->cur, new->br_startoff,
1794                                         new->br_startblock,
1795                                         new->br_blockcount +
1796                                                 right.br_blockcount,
1797                                         right.br_state);
1798                         if (error)
1799                                 goto done;
1800                 }
1801                 break;
1802
1803         case 0:
1804                 /*
1805                  * New allocation is not contiguous with another
1806                  * real allocation.
1807                  * Insert a new entry.
1808                  */
1809                 xfs_iext_insert(bma->ip, bma->idx, 1, new, state);
1810                 XFS_IFORK_NEXT_SET(bma->ip, whichfork,
1811                         XFS_IFORK_NEXTENTS(bma->ip, whichfork) + 1);
1812                 if (bma->cur == NULL) {
1813                         rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
1814                 } else {
1815                         rval = XFS_ILOG_CORE;
1816                         error = xfs_bmbt_lookup_eq(bma->cur,
1817                                         new->br_startoff,
1818                                         new->br_startblock,
1819                                         new->br_blockcount, &i);
1820                         if (error)
1821                                 goto done;
1822                         XFS_WANT_CORRUPTED_GOTO(i == 0, done);
1823                         bma->cur->bc_rec.b.br_state = new->br_state;
1824                         error = xfs_btree_insert(bma->cur, &i);
1825                         if (error)
1826                                 goto done;
1827                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
1828                 }
1829                 break;
1830         }
1831
1832         /* convert to a btree if necessary */
1833         if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
1834                 int     tmp_logflags;   /* partial log flag return val */
1835
1836                 ASSERT(bma->cur == NULL);
1837                 error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
1838                                 bma->firstblock, bma->flist, &bma->cur,
1839                                 0, &tmp_logflags, whichfork);
1840                 bma->logflags |= tmp_logflags;
1841                 if (error)
1842                         goto done;
1843         }
1844
1845         /* clear out the allocated field, done with it now in any case. */
1846         if (bma->cur)
1847                 bma->cur->bc_private.b.allocated = 0;
1848
1849         xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork);
1850 done:
1851         bma->logflags |= rval;
1852         return error;
1853 }
1854
1855 /*
1856  * Adjust the size of the new extent based on di_extsize and rt extsize.
1857  */
1858 STATIC int
1859 xfs_bmap_extsize_align(
1860         xfs_mount_t     *mp,
1861         xfs_bmbt_irec_t *gotp,          /* next extent pointer */
1862         xfs_bmbt_irec_t *prevp,         /* previous extent pointer */
1863         xfs_extlen_t    extsz,          /* align to this extent size */
1864         int             rt,             /* is this a realtime inode? */
1865         int             eof,            /* is extent at end-of-file? */
1866         int             delay,          /* creating delalloc extent? */
1867         int             convert,        /* overwriting unwritten extent? */
1868         xfs_fileoff_t   *offp,          /* in/out: aligned offset */
1869         xfs_extlen_t    *lenp)          /* in/out: aligned length */
1870 {
1871         xfs_fileoff_t   orig_off;       /* original offset */
1872         xfs_extlen_t    orig_alen;      /* original length */
1873         xfs_fileoff_t   orig_end;       /* original off+len */
1874         xfs_fileoff_t   nexto;          /* next file offset */
1875         xfs_fileoff_t   prevo;          /* previous file offset */
1876         xfs_fileoff_t   align_off;      /* temp for offset */
1877         xfs_extlen_t    align_alen;     /* temp for length */
1878         xfs_extlen_t    temp;           /* temp for calculations */
1879
1880         if (convert)
1881                 return 0;
1882
1883         orig_off = align_off = *offp;
1884         orig_alen = align_alen = *lenp;
1885         orig_end = orig_off + orig_alen;
1886
1887         /*
1888          * If this request overlaps an existing extent, then don't
1889          * attempt to perform any additional alignment.
1890          */
1891         if (!delay && !eof &&
1892             (orig_off >= gotp->br_startoff) &&
1893             (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
1894                 return 0;
1895         }
1896
1897         /*
1898          * If the file offset is unaligned vs. the extent size
1899          * we need to align it.  This will be possible unless
1900          * the file was previously written with a kernel that didn't
1901          * perform this alignment, or if a truncate shot us in the
1902          * foot.
1903          */
1904         temp = do_mod(orig_off, extsz);
1905         if (temp) {
1906                 align_alen += temp;
1907                 align_off -= temp;
1908         }
1909         /*
1910          * Same adjustment for the end of the requested area.
1911          */
1912         if ((temp = (align_alen % extsz))) {
1913                 align_alen += extsz - temp;
1914         }
1915         /*
1916          * If the previous block overlaps with this proposed allocation
1917          * then move the start forward without adjusting the length.
1918          */
1919         if (prevp->br_startoff != NULLFILEOFF) {
1920                 if (prevp->br_startblock == HOLESTARTBLOCK)
1921                         prevo = prevp->br_startoff;
1922                 else
1923                         prevo = prevp->br_startoff + prevp->br_blockcount;
1924         } else
1925                 prevo = 0;
1926         if (align_off != orig_off && align_off < prevo)
1927                 align_off = prevo;
1928         /*
1929          * If the next block overlaps with this proposed allocation
1930          * then move the start back without adjusting the length,
1931          * but not before offset 0.
1932          * This may of course make the start overlap previous block,
1933          * and if we hit the offset 0 limit then the next block
1934          * can still overlap too.
1935          */
1936         if (!eof && gotp->br_startoff != NULLFILEOFF) {
1937                 if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
1938                     (!delay && gotp->br_startblock == DELAYSTARTBLOCK))
1939                         nexto = gotp->br_startoff + gotp->br_blockcount;
1940                 else
1941                         nexto = gotp->br_startoff;
1942         } else
1943                 nexto = NULLFILEOFF;
1944         if (!eof &&
1945             align_off + align_alen != orig_end &&
1946             align_off + align_alen > nexto)
1947                 align_off = nexto > align_alen ? nexto - align_alen : 0;
1948         /*
1949          * If we're now overlapping the next or previous extent that
1950          * means we can't fit an extsz piece in this hole.  Just move
1951          * the start forward to the first valid spot and set
1952          * the length so we hit the end.
1953          */
1954         if (align_off != orig_off && align_off < prevo)
1955                 align_off = prevo;
1956         if (align_off + align_alen != orig_end &&
1957             align_off + align_alen > nexto &&
1958             nexto != NULLFILEOFF) {
1959                 ASSERT(nexto > prevo);
1960                 align_alen = nexto - align_off;
1961         }
1962
1963         /*
1964          * If realtime, and the result isn't a multiple of the realtime
1965          * extent size we need to remove blocks until it is.
1966          */
1967         if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
1968                 /*
1969                  * We're not covering the original request, or
1970                  * we won't be able to once we fix the length.
1971                  */
1972                 if (orig_off < align_off ||
1973                     orig_end > align_off + align_alen ||
1974                     align_alen - temp < orig_alen)
1975                         return XFS_ERROR(EINVAL);
1976                 /*
1977                  * Try to fix it by moving the start up.
1978                  */
1979                 if (align_off + temp <= orig_off) {
1980                         align_alen -= temp;
1981                         align_off += temp;
1982                 }
1983                 /*
1984                  * Try to fix it by moving the end in.
1985                  */
1986                 else if (align_off + align_alen - temp >= orig_end)
1987                         align_alen -= temp;
1988                 /*
1989                  * Set the start to the minimum then trim the length.
1990                  */
1991                 else {
1992                         align_alen -= orig_off - align_off;
1993                         align_off = orig_off;
1994                         align_alen -= align_alen % mp->m_sb.sb_rextsize;
1995                 }
1996                 /*
1997                  * Result doesn't cover the request, fail it.
1998                  */
1999                 if (orig_off < align_off || orig_end > align_off + align_alen)
2000                         return XFS_ERROR(EINVAL);
2001         } else {
2002                 ASSERT(orig_off >= align_off);
2003                 ASSERT(orig_end <= align_off + align_alen);
2004         }
2005
2006 #ifdef DEBUG
2007         if (!eof && gotp->br_startoff != NULLFILEOFF)
2008                 ASSERT(align_off + align_alen <= gotp->br_startoff);
2009         if (prevp->br_startoff != NULLFILEOFF)
2010                 ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
2011 #endif
2012
2013         *lenp = align_alen;
2014         *offp = align_off;
2015         return 0;
2016 }
2017
2018 #define XFS_ALLOC_GAP_UNITS     4
2019
2020 STATIC void
2021 xfs_bmap_adjacent(
2022         xfs_bmalloca_t  *ap)            /* bmap alloc argument struct */
2023 {
2024         xfs_fsblock_t   adjust;         /* adjustment to block numbers */
2025         xfs_agnumber_t  fb_agno;        /* ag number of ap->firstblock */
2026         xfs_mount_t     *mp;            /* mount point structure */
2027         int             nullfb;         /* true if ap->firstblock isn't set */
2028         int             rt;             /* true if inode is realtime */
2029
2030 #define ISVALID(x,y)    \
2031         (rt ? \
2032                 (x) < mp->m_sb.sb_rblocks : \
2033                 XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
2034                 XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
2035                 XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
2036
2037         mp = ap->ip->i_mount;
2038         nullfb = *ap->firstblock == NULLFSBLOCK;
2039         rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
2040         fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock);
2041         /*
2042          * If allocating at eof, and there's a previous real block,
2043          * try to use its last block as our starting point.
2044          */
2045         if (ap->eof && ap->prev.br_startoff != NULLFILEOFF &&
2046             !isnullstartblock(ap->prev.br_startblock) &&
2047             ISVALID(ap->prev.br_startblock + ap->prev.br_blockcount,
2048                     ap->prev.br_startblock)) {
2049                 ap->blkno = ap->prev.br_startblock + ap->prev.br_blockcount;
2050                 /*
2051                  * Adjust for the gap between prevp and us.
2052                  */
2053                 adjust = ap->offset -
2054                         (ap->prev.br_startoff + ap->prev.br_blockcount);
2055                 if (adjust &&
2056                     ISVALID(ap->blkno + adjust, ap->prev.br_startblock))
2057                         ap->blkno += adjust;
2058         }
2059         /*
2060          * If not at eof, then compare the two neighbor blocks.
2061          * Figure out whether either one gives us a good starting point,
2062          * and pick the better one.
2063          */
2064         else if (!ap->eof) {
2065                 xfs_fsblock_t   gotbno;         /* right side block number */
2066                 xfs_fsblock_t   gotdiff=0;      /* right side difference */
2067                 xfs_fsblock_t   prevbno;        /* left side block number */
2068                 xfs_fsblock_t   prevdiff=0;     /* left side difference */
2069
2070                 /*
2071                  * If there's a previous (left) block, select a requested
2072                  * start block based on it.
2073                  */
2074                 if (ap->prev.br_startoff != NULLFILEOFF &&
2075                     !isnullstartblock(ap->prev.br_startblock) &&
2076                     (prevbno = ap->prev.br_startblock +
2077                                ap->prev.br_blockcount) &&
2078                     ISVALID(prevbno, ap->prev.br_startblock)) {
2079                         /*
2080                          * Calculate gap to end of previous block.
2081                          */
2082                         adjust = prevdiff = ap->offset -
2083                                 (ap->prev.br_startoff +
2084                                  ap->prev.br_blockcount);
2085                         /*
2086                          * Figure the startblock based on the previous block's
2087                          * end and the gap size.
2088                          * Heuristic!
2089                          * If the gap is large relative to the piece we're
2090                          * allocating, or using it gives us an invalid block
2091                          * number, then just use the end of the previous block.
2092                          */
2093                         if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
2094                             ISVALID(prevbno + prevdiff,
2095                                     ap->prev.br_startblock))
2096                                 prevbno += adjust;
2097                         else
2098                                 prevdiff += adjust;
2099                         /*
2100                          * If the firstblock forbids it, can't use it,
2101                          * must use default.
2102                          */
2103                         if (!rt && !nullfb &&
2104                             XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
2105                                 prevbno = NULLFSBLOCK;
2106                 }
2107                 /*
2108                  * No previous block or can't follow it, just default.
2109                  */
2110                 else
2111                         prevbno = NULLFSBLOCK;
2112                 /*
2113                  * If there's a following (right) block, select a requested
2114                  * start block based on it.
2115                  */
2116                 if (!isnullstartblock(ap->got.br_startblock)) {
2117                         /*
2118                          * Calculate gap to start of next block.
2119                          */
2120                         adjust = gotdiff = ap->got.br_startoff - ap->offset;
2121                         /*
2122                          * Figure the startblock based on the next block's
2123                          * start and the gap size.
2124                          */
2125                         gotbno = ap->got.br_startblock;
2126                         /*
2127                          * Heuristic!
2128                          * If the gap is large relative to the piece we're
2129                          * allocating, or using it gives us an invalid block
2130                          * number, then just use the start of the next block
2131                          * offset by our length.
2132                          */
2133                         if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
2134                             ISVALID(gotbno - gotdiff, gotbno))
2135                                 gotbno -= adjust;
2136                         else if (ISVALID(gotbno - ap->length, gotbno)) {
2137                                 gotbno -= ap->length;
2138                                 gotdiff += adjust - ap->length;
2139                         } else
2140                                 gotdiff += adjust;
2141                         /*
2142                          * If the firstblock forbids it, can't use it,
2143                          * must use default.
2144                          */
2145                         if (!rt && !nullfb &&
2146                             XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
2147                                 gotbno = NULLFSBLOCK;
2148                 }
2149                 /*
2150                  * No next block, just default.
2151                  */
2152                 else
2153                         gotbno = NULLFSBLOCK;
2154                 /*
2155                  * If both valid, pick the better one, else the only good
2156                  * one, else ap->blkno is already set (to 0 or the inode block).
2157                  */
2158                 if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
2159                         ap->blkno = prevdiff <= gotdiff ? prevbno : gotbno;
2160                 else if (prevbno != NULLFSBLOCK)
2161                         ap->blkno = prevbno;
2162                 else if (gotbno != NULLFSBLOCK)
2163                         ap->blkno = gotbno;
2164         }
2165 #undef ISVALID
2166 }
2167
2168 STATIC int
2169 xfs_bmap_rtalloc(
2170         xfs_bmalloca_t  *ap)            /* bmap alloc argument struct */
2171 {
2172         xfs_alloctype_t atype = 0;      /* type for allocation routines */
2173         int             error;          /* error return value */
2174         xfs_mount_t     *mp;            /* mount point structure */
2175         xfs_extlen_t    prod = 0;       /* product factor for allocators */
2176         xfs_extlen_t    ralen = 0;      /* realtime allocation length */
2177         xfs_extlen_t    align;          /* minimum allocation alignment */
2178         xfs_rtblock_t   rtb;
2179
2180         mp = ap->ip->i_mount;
2181         align = xfs_get_extsz_hint(ap->ip);
2182         prod = align / mp->m_sb.sb_rextsize;
2183         error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
2184                                         align, 1, ap->eof, 0,
2185                                         ap->conv, &ap->offset, &ap->length);
2186         if (error)
2187                 return error;
2188         ASSERT(ap->length);
2189         ASSERT(ap->length % mp->m_sb.sb_rextsize == 0);
2190
2191         /*
2192          * If the offset & length are not perfectly aligned
2193          * then kill prod, it will just get us in trouble.
2194          */
2195         if (do_mod(ap->offset, align) || ap->length % align)
2196                 prod = 1;
2197         /*
2198          * Set ralen to be the actual requested length in rtextents.
2199          */
2200         ralen = ap->length / mp->m_sb.sb_rextsize;
2201         /*
2202          * If the old value was close enough to MAXEXTLEN that
2203          * we rounded up to it, cut it back so it's valid again.
2204          * Note that if it's a really large request (bigger than
2205          * MAXEXTLEN), we don't hear about that number, and can't
2206          * adjust the starting point to match it.
2207          */
2208         if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
2209                 ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
2210
2211         /*
2212          * Lock out other modifications to the RT bitmap inode.
2213          */
2214         xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
2215         xfs_trans_ijoin(ap->tp, mp->m_rbmip, XFS_ILOCK_EXCL);
2216
2217         /*
2218          * If it's an allocation to an empty file at offset 0,
2219          * pick an extent that will space things out in the rt area.
2220          */
2221         if (ap->eof && ap->offset == 0) {
2222                 xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */
2223
2224                 error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
2225                 if (error)
2226                         return error;
2227                 ap->blkno = rtx * mp->m_sb.sb_rextsize;
2228         } else {
2229                 ap->blkno = 0;
2230         }
2231
2232         xfs_bmap_adjacent(ap);
2233
2234         /*
2235          * Realtime allocation, done through xfs_rtallocate_extent.
2236          */
2237         atype = ap->blkno == 0 ?  XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
2238         do_div(ap->blkno, mp->m_sb.sb_rextsize);
2239         rtb = ap->blkno;
2240         ap->length = ralen;
2241         if ((error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1, ap->length,
2242                                 &ralen, atype, ap->wasdel, prod, &rtb)))
2243                 return error;
2244         if (rtb == NULLFSBLOCK && prod > 1 &&
2245             (error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1,
2246                                            ap->length, &ralen, atype,
2247                                            ap->wasdel, 1, &rtb)))
2248                 return error;
2249         ap->blkno = rtb;
2250         if (ap->blkno != NULLFSBLOCK) {
2251                 ap->blkno *= mp->m_sb.sb_rextsize;
2252                 ralen *= mp->m_sb.sb_rextsize;
2253                 ap->length = ralen;
2254                 ap->ip->i_d.di_nblocks += ralen;
2255                 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2256                 if (ap->wasdel)
2257                         ap->ip->i_delayed_blks -= ralen;
2258                 /*
2259                  * Adjust the disk quota also. This was reserved
2260                  * earlier.
2261                  */
2262                 xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
2263                         ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
2264                                         XFS_TRANS_DQ_RTBCOUNT, (long) ralen);
2265         } else {
2266                 ap->length = 0;
2267         }
2268         return 0;
2269 }
2270
2271 STATIC int
2272 xfs_bmap_btalloc_nullfb(
2273         struct xfs_bmalloca     *ap,
2274         struct xfs_alloc_arg    *args,
2275         xfs_extlen_t            *blen)
2276 {
2277         struct xfs_mount        *mp = ap->ip->i_mount;
2278         struct xfs_perag        *pag;
2279         xfs_agnumber_t          ag, startag;
2280         int                     notinit = 0;
2281         int                     error;
2282
2283         if (ap->userdata && xfs_inode_is_filestream(ap->ip))
2284                 args->type = XFS_ALLOCTYPE_NEAR_BNO;
2285         else
2286                 args->type = XFS_ALLOCTYPE_START_BNO;
2287         args->total = ap->total;
2288
2289         /*
2290          * Search for an allocation group with a single extent large enough
2291          * for the request.  If one isn't found, then adjust the minimum
2292          * allocation size to the largest space found.
2293          */
2294         startag = ag = XFS_FSB_TO_AGNO(mp, args->fsbno);
2295         if (startag == NULLAGNUMBER)
2296                 startag = ag = 0;
2297
2298         pag = xfs_perag_get(mp, ag);
2299         while (*blen < args->maxlen) {
2300                 if (!pag->pagf_init) {
2301                         error = xfs_alloc_pagf_init(mp, args->tp, ag,
2302                                                     XFS_ALLOC_FLAG_TRYLOCK);
2303                         if (error) {
2304                                 xfs_perag_put(pag);
2305                                 return error;
2306                         }
2307                 }
2308
2309                 /*
2310                  * See xfs_alloc_fix_freelist...
2311                  */
2312                 if (pag->pagf_init) {
2313                         xfs_extlen_t    longest;
2314                         longest = xfs_alloc_longest_free_extent(mp, pag);
2315                         if (*blen < longest)
2316                                 *blen = longest;
2317                 } else
2318                         notinit = 1;
2319
2320                 if (xfs_inode_is_filestream(ap->ip)) {
2321                         if (*blen >= args->maxlen)
2322                                 break;
2323
2324                         if (ap->userdata) {
2325                                 /*
2326                                  * If startag is an invalid AG, we've
2327                                  * come here once before and
2328                                  * xfs_filestream_new_ag picked the
2329                                  * best currently available.
2330                                  *
2331                                  * Don't continue looping, since we
2332                                  * could loop forever.
2333                                  */
2334                                 if (startag == NULLAGNUMBER)
2335                                         break;
2336
2337                                 error = xfs_filestream_new_ag(ap, &ag);
2338                                 xfs_perag_put(pag);
2339                                 if (error)
2340                                         return error;
2341
2342                                 /* loop again to set 'blen'*/
2343                                 startag = NULLAGNUMBER;
2344                                 pag = xfs_perag_get(mp, ag);
2345                                 continue;
2346                         }
2347                 }
2348                 if (++ag == mp->m_sb.sb_agcount)
2349                         ag = 0;
2350                 if (ag == startag)
2351                         break;
2352                 xfs_perag_put(pag);
2353                 pag = xfs_perag_get(mp, ag);
2354         }
2355         xfs_perag_put(pag);
2356
2357         /*
2358          * Since the above loop did a BUF_TRYLOCK, it is
2359          * possible that there is space for this request.
2360          */
2361         if (notinit || *blen < ap->minlen)
2362                 args->minlen = ap->minlen;
2363         /*
2364          * If the best seen length is less than the request
2365          * length, use the best as the minimum.
2366          */
2367         else if (*blen < args->maxlen)
2368                 args->minlen = *blen;
2369         /*
2370          * Otherwise we've seen an extent as big as maxlen,
2371          * use that as the minimum.
2372          */
2373         else
2374                 args->minlen = args->maxlen;
2375
2376         /*
2377          * set the failure fallback case to look in the selected
2378          * AG as the stream may have moved.
2379          */
2380         if (xfs_inode_is_filestream(ap->ip))
2381                 ap->blkno = args->fsbno = XFS_AGB_TO_FSB(mp, ag, 0);
2382
2383         return 0;
2384 }
2385
2386 STATIC int
2387 xfs_bmap_btalloc(
2388         xfs_bmalloca_t  *ap)            /* bmap alloc argument struct */
2389 {
2390         xfs_mount_t     *mp;            /* mount point structure */
2391         xfs_alloctype_t atype = 0;      /* type for allocation routines */
2392         xfs_extlen_t    align;          /* minimum allocation alignment */
2393         xfs_agnumber_t  fb_agno;        /* ag number of ap->firstblock */
2394         xfs_agnumber_t  ag;
2395         xfs_alloc_arg_t args;
2396         xfs_extlen_t    blen;
2397         xfs_extlen_t    nextminlen = 0;
2398         int             nullfb;         /* true if ap->firstblock isn't set */
2399         int             isaligned;
2400         int             tryagain;
2401         int             error;
2402
2403         ASSERT(ap->length);
2404
2405         mp = ap->ip->i_mount;
2406         align = ap->userdata ? xfs_get_extsz_hint(ap->ip) : 0;
2407         if (unlikely(align)) {
2408                 error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
2409                                                 align, 0, ap->eof, 0, ap->conv,
2410                                                 &ap->offset, &ap->length);
2411                 ASSERT(!error);
2412                 ASSERT(ap->length);
2413         }
2414         nullfb = *ap->firstblock == NULLFSBLOCK;
2415         fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock);
2416         if (nullfb) {
2417                 if (ap->userdata && xfs_inode_is_filestream(ap->ip)) {
2418                         ag = xfs_filestream_lookup_ag(ap->ip);
2419                         ag = (ag != NULLAGNUMBER) ? ag : 0;
2420                         ap->blkno = XFS_AGB_TO_FSB(mp, ag, 0);
2421                 } else {
2422                         ap->blkno = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
2423                 }
2424         } else
2425                 ap->blkno = *ap->firstblock;
2426
2427         xfs_bmap_adjacent(ap);
2428
2429         /*
2430          * If allowed, use ap->blkno; otherwise must use firstblock since
2431          * it's in the right allocation group.
2432          */
2433         if (nullfb || XFS_FSB_TO_AGNO(mp, ap->blkno) == fb_agno)
2434                 ;
2435         else
2436                 ap->blkno = *ap->firstblock;
2437         /*
2438          * Normal allocation, done through xfs_alloc_vextent.
2439          */
2440         tryagain = isaligned = 0;
2441         args.tp = ap->tp;
2442         args.mp = mp;
2443         args.fsbno = ap->blkno;
2444
2445         /* Trim the allocation back to the maximum an AG can fit. */
2446         args.maxlen = MIN(ap->length, XFS_ALLOC_AG_MAX_USABLE(mp));
2447         args.firstblock = *ap->firstblock;
2448         blen = 0;
2449         if (nullfb) {
2450                 error = xfs_bmap_btalloc_nullfb(ap, &args, &blen);
2451                 if (error)
2452                         return error;
2453         } else if (ap->flist->xbf_low) {
2454                 if (xfs_inode_is_filestream(ap->ip))
2455                         args.type = XFS_ALLOCTYPE_FIRST_AG;
2456                 else
2457                         args.type = XFS_ALLOCTYPE_START_BNO;
2458                 args.total = args.minlen = ap->minlen;
2459         } else {
2460                 args.type = XFS_ALLOCTYPE_NEAR_BNO;
2461                 args.total = ap->total;
2462                 args.minlen = ap->minlen;
2463         }
2464         /* apply extent size hints if obtained earlier */
2465         if (unlikely(align)) {
2466                 args.prod = align;
2467                 if ((args.mod = (xfs_extlen_t)do_mod(ap->offset, args.prod)))
2468                         args.mod = (xfs_extlen_t)(args.prod - args.mod);
2469         } else if (mp->m_sb.sb_blocksize >= PAGE_CACHE_SIZE) {
2470                 args.prod = 1;
2471                 args.mod = 0;
2472         } else {
2473                 args.prod = PAGE_CACHE_SIZE >> mp->m_sb.sb_blocklog;
2474                 if ((args.mod = (xfs_extlen_t)(do_mod(ap->offset, args.prod))))
2475                         args.mod = (xfs_extlen_t)(args.prod - args.mod);
2476         }
2477         /*
2478          * If we are not low on available data blocks, and the
2479          * underlying logical volume manager is a stripe, and
2480          * the file offset is zero then try to allocate data
2481          * blocks on stripe unit boundary.
2482          * NOTE: ap->aeof is only set if the allocation length
2483          * is >= the stripe unit and the allocation offset is
2484          * at the end of file.
2485          */
2486         if (!ap->flist->xbf_low && ap->aeof) {
2487                 if (!ap->offset) {
2488                         args.alignment = mp->m_dalign;
2489                         atype = args.type;
2490                         isaligned = 1;
2491                         /*
2492                          * Adjust for alignment
2493                          */
2494                         if (blen > args.alignment && blen <= args.maxlen)
2495                                 args.minlen = blen - args.alignment;
2496                         args.minalignslop = 0;
2497                 } else {
2498                         /*
2499                          * First try an exact bno allocation.
2500                          * If it fails then do a near or start bno
2501                          * allocation with alignment turned on.
2502                          */
2503                         atype = args.type;
2504                         tryagain = 1;
2505                         args.type = XFS_ALLOCTYPE_THIS_BNO;
2506                         args.alignment = 1;
2507                         /*
2508                          * Compute the minlen+alignment for the
2509                          * next case.  Set slop so that the value
2510                          * of minlen+alignment+slop doesn't go up
2511                          * between the calls.
2512                          */
2513                         if (blen > mp->m_dalign && blen <= args.maxlen)
2514                                 nextminlen = blen - mp->m_dalign;
2515                         else
2516                                 nextminlen = args.minlen;
2517                         if (nextminlen + mp->m_dalign > args.minlen + 1)
2518                                 args.minalignslop =
2519                                         nextminlen + mp->m_dalign -
2520                                         args.minlen - 1;
2521                         else
2522                                 args.minalignslop = 0;
2523                 }
2524         } else {
2525                 args.alignment = 1;
2526                 args.minalignslop = 0;
2527         }
2528         args.minleft = ap->minleft;
2529         args.wasdel = ap->wasdel;
2530         args.isfl = 0;
2531         args.userdata = ap->userdata;
2532         if ((error = xfs_alloc_vextent(&args)))
2533                 return error;
2534         if (tryagain && args.fsbno == NULLFSBLOCK) {
2535                 /*
2536                  * Exact allocation failed. Now try with alignment
2537                  * turned on.
2538                  */
2539                 args.type = atype;
2540                 args.fsbno = ap->blkno;
2541                 args.alignment = mp->m_dalign;
2542                 args.minlen = nextminlen;
2543                 args.minalignslop = 0;
2544                 isaligned = 1;
2545                 if ((error = xfs_alloc_vextent(&args)))
2546                         return error;
2547         }
2548         if (isaligned && args.fsbno == NULLFSBLOCK) {
2549                 /*
2550                  * allocation failed, so turn off alignment and
2551                  * try again.
2552                  */
2553                 args.type = atype;
2554                 args.fsbno = ap->blkno;
2555                 args.alignment = 0;
2556                 if ((error = xfs_alloc_vextent(&args)))
2557                         return error;
2558         }
2559         if (args.fsbno == NULLFSBLOCK && nullfb &&
2560             args.minlen > ap->minlen) {
2561                 args.minlen = ap->minlen;
2562                 args.type = XFS_ALLOCTYPE_START_BNO;
2563                 args.fsbno = ap->blkno;
2564                 if ((error = xfs_alloc_vextent(&args)))
2565                         return error;
2566         }
2567         if (args.fsbno == NULLFSBLOCK && nullfb) {
2568                 args.fsbno = 0;
2569                 args.type = XFS_ALLOCTYPE_FIRST_AG;
2570                 args.total = ap->minlen;
2571                 args.minleft = 0;
2572                 if ((error = xfs_alloc_vextent(&args)))
2573                         return error;
2574                 ap->flist->xbf_low = 1;
2575         }
2576         if (args.fsbno != NULLFSBLOCK) {
2577                 /*
2578                  * check the allocation happened at the same or higher AG than
2579                  * the first block that was allocated.
2580                  */
2581                 ASSERT(*ap->firstblock == NULLFSBLOCK ||
2582                        XFS_FSB_TO_AGNO(mp, *ap->firstblock) ==
2583                        XFS_FSB_TO_AGNO(mp, args.fsbno) ||
2584                        (ap->flist->xbf_low &&
2585                         XFS_FSB_TO_AGNO(mp, *ap->firstblock) <
2586                         XFS_FSB_TO_AGNO(mp, args.fsbno)));
2587
2588                 ap->blkno = args.fsbno;
2589                 if (*ap->firstblock == NULLFSBLOCK)
2590                         *ap->firstblock = args.fsbno;
2591                 ASSERT(nullfb || fb_agno == args.agno ||
2592                        (ap->flist->xbf_low && fb_agno < args.agno));
2593                 ap->length = args.len;
2594                 ap->ip->i_d.di_nblocks += args.len;
2595                 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2596                 if (ap->wasdel)
2597                         ap->ip->i_delayed_blks -= args.len;
2598                 /*
2599                  * Adjust the disk quota also. This was reserved
2600                  * earlier.
2601                  */
2602                 xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
2603                         ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
2604                                         XFS_TRANS_DQ_BCOUNT,
2605                         (long) args.len);
2606         } else {
2607                 ap->blkno = NULLFSBLOCK;
2608                 ap->length = 0;
2609         }
2610         return 0;
2611 }
2612
2613 /*
2614  * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
2615  * It figures out where to ask the underlying allocator to put the new extent.
2616  */
2617 STATIC int
2618 xfs_bmap_alloc(
2619         xfs_bmalloca_t  *ap)            /* bmap alloc argument struct */
2620 {
2621         if (XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata)
2622                 return xfs_bmap_rtalloc(ap);
2623         return xfs_bmap_btalloc(ap);
2624 }
2625
2626 /*
2627  * Transform a btree format file with only one leaf node, where the
2628  * extents list will fit in the inode, into an extents format file.
2629  * Since the file extents are already in-core, all we have to do is
2630  * give up the space for the btree root and pitch the leaf block.
2631  */
2632 STATIC int                              /* error */
2633 xfs_bmap_btree_to_extents(
2634         xfs_trans_t             *tp,    /* transaction pointer */
2635         xfs_inode_t             *ip,    /* incore inode pointer */
2636         xfs_btree_cur_t         *cur,   /* btree cursor */
2637         int                     *logflagsp, /* inode logging flags */
2638         int                     whichfork)  /* data or attr fork */
2639 {
2640         /* REFERENCED */
2641         struct xfs_btree_block  *cblock;/* child btree block */
2642         xfs_fsblock_t           cbno;   /* child block number */
2643         xfs_buf_t               *cbp;   /* child block's buffer */
2644         int                     error;  /* error return value */
2645         xfs_ifork_t             *ifp;   /* inode fork data */
2646         xfs_mount_t             *mp;    /* mount point structure */
2647         __be64                  *pp;    /* ptr to block address */
2648         struct xfs_btree_block  *rblock;/* root btree block */
2649
2650         mp = ip->i_mount;
2651         ifp = XFS_IFORK_PTR(ip, whichfork);
2652         ASSERT(ifp->if_flags & XFS_IFEXTENTS);
2653         ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
2654         rblock = ifp->if_broot;
2655         ASSERT(be16_to_cpu(rblock->bb_level) == 1);
2656         ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
2657         ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
2658         pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
2659         cbno = be64_to_cpu(*pp);
2660         *logflagsp = 0;
2661 #ifdef DEBUG
2662         if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
2663                 return error;
2664 #endif
2665         if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
2666                         XFS_BMAP_BTREE_REF)))
2667                 return error;
2668         cblock = XFS_BUF_TO_BLOCK(cbp);
2669         if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
2670                 return error;
2671         xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
2672         ip->i_d.di_nblocks--;
2673         xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
2674         xfs_trans_binval(tp, cbp);
2675         if (cur->bc_bufs[0] == cbp)
2676                 cur->bc_bufs[0] = NULL;
2677         xfs_iroot_realloc(ip, -1, whichfork);
2678         ASSERT(ifp->if_broot == NULL);
2679         ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
2680         XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
2681         *logflagsp = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
2682         return 0;
2683 }
2684
2685 /*
2686  * Called by xfs_bmapi to update file extent records and the btree
2687  * after removing space (or undoing a delayed allocation).
2688  */
2689 STATIC int                              /* error */
2690 xfs_bmap_del_extent(
2691         xfs_inode_t             *ip,    /* incore inode pointer */
2692         xfs_trans_t             *tp,    /* current transaction pointer */
2693         xfs_extnum_t            *idx,   /* extent number to update/delete */
2694         xfs_bmap_free_t         *flist, /* list of extents to be freed */
2695         xfs_btree_cur_t         *cur,   /* if null, not a btree */
2696         xfs_bmbt_irec_t         *del,   /* data to remove from extents */
2697         int                     *logflagsp, /* inode logging flags */
2698         int                     whichfork) /* data or attr fork */
2699 {
2700         xfs_filblks_t           da_new; /* new delay-alloc indirect blocks */
2701         xfs_filblks_t           da_old; /* old delay-alloc indirect blocks */
2702         xfs_fsblock_t           del_endblock=0; /* first block past del */
2703         xfs_fileoff_t           del_endoff;     /* first offset past del */
2704         int                     delay;  /* current block is delayed allocated */
2705         int                     do_fx;  /* free extent at end of routine */
2706         xfs_bmbt_rec_host_t     *ep;    /* current extent entry pointer */
2707         int                     error;  /* error return value */
2708         int                     flags;  /* inode logging flags */
2709         xfs_bmbt_irec_t         got;    /* current extent entry */
2710         xfs_fileoff_t           got_endoff;     /* first offset past got */
2711         int                     i;      /* temp state */
2712         xfs_ifork_t             *ifp;   /* inode fork pointer */
2713         xfs_mount_t             *mp;    /* mount structure */
2714         xfs_filblks_t           nblks;  /* quota/sb block count */
2715         xfs_bmbt_irec_t         new;    /* new record to be inserted */
2716         /* REFERENCED */
2717         uint                    qfield; /* quota field to update */
2718         xfs_filblks_t           temp;   /* for indirect length calculations */
2719         xfs_filblks_t           temp2;  /* for indirect length calculations */
2720         int                     state = 0;
2721
2722         XFS_STATS_INC(xs_del_exlist);
2723
2724         if (whichfork == XFS_ATTR_FORK)
2725                 state |= BMAP_ATTRFORK;
2726
2727         mp = ip->i_mount;
2728         ifp = XFS_IFORK_PTR(ip, whichfork);
2729         ASSERT((*idx >= 0) && (*idx < ifp->if_bytes /
2730                 (uint)sizeof(xfs_bmbt_rec_t)));
2731         ASSERT(del->br_blockcount > 0);
2732         ep = xfs_iext_get_ext(ifp, *idx);
2733         xfs_bmbt_get_all(ep, &got);
2734         ASSERT(got.br_startoff <= del->br_startoff);
2735         del_endoff = del->br_startoff + del->br_blockcount;
2736         got_endoff = got.br_startoff + got.br_blockcount;
2737         ASSERT(got_endoff >= del_endoff);
2738         delay = isnullstartblock(got.br_startblock);
2739         ASSERT(isnullstartblock(del->br_startblock) == delay);
2740         flags = 0;
2741         qfield = 0;
2742         error = 0;
2743         /*
2744          * If deleting a real allocation, must free up the disk space.
2745          */
2746         if (!delay) {
2747                 flags = XFS_ILOG_CORE;
2748                 /*
2749                  * Realtime allocation.  Free it and record di_nblocks update.
2750                  */
2751                 if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
2752                         xfs_fsblock_t   bno;
2753                         xfs_filblks_t   len;
2754
2755                         ASSERT(do_mod(del->br_blockcount,
2756                                       mp->m_sb.sb_rextsize) == 0);
2757                         ASSERT(do_mod(del->br_startblock,
2758                                       mp->m_sb.sb_rextsize) == 0);
2759                         bno = del->br_startblock;
2760                         len = del->br_blockcount;
2761                         do_div(bno, mp->m_sb.sb_rextsize);
2762                         do_div(len, mp->m_sb.sb_rextsize);
2763                         error = xfs_rtfree_extent(tp, bno, (xfs_extlen_t)len);
2764                         if (error)
2765                                 goto done;
2766                         do_fx = 0;
2767                         nblks = len * mp->m_sb.sb_rextsize;
2768                         qfield = XFS_TRANS_DQ_RTBCOUNT;
2769                 }
2770                 /*
2771                  * Ordinary allocation.
2772                  */
2773                 else {
2774                         do_fx = 1;
2775                         nblks = del->br_blockcount;
2776                         qfield = XFS_TRANS_DQ_BCOUNT;
2777                 }
2778                 /*
2779                  * Set up del_endblock and cur for later.
2780                  */
2781                 del_endblock = del->br_startblock + del->br_blockcount;
2782                 if (cur) {
2783                         if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
2784                                         got.br_startblock, got.br_blockcount,
2785                                         &i)))
2786                                 goto done;
2787                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2788                 }
2789                 da_old = da_new = 0;
2790         } else {
2791                 da_old = startblockval(got.br_startblock);
2792                 da_new = 0;
2793                 nblks = 0;
2794                 do_fx = 0;
2795         }
2796         /*
2797          * Set flag value to use in switch statement.
2798          * Left-contig is 2, right-contig is 1.
2799          */
2800         switch (((got.br_startoff == del->br_startoff) << 1) |
2801                 (got_endoff == del_endoff)) {
2802         case 3:
2803                 /*
2804                  * Matches the whole extent.  Delete the entry.
2805                  */
2806                 xfs_iext_remove(ip, *idx, 1,
2807                                 whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0);
2808                 --*idx;
2809                 if (delay)
2810                         break;
2811
2812                 XFS_IFORK_NEXT_SET(ip, whichfork,
2813                         XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2814                 flags |= XFS_ILOG_CORE;
2815                 if (!cur) {
2816                         flags |= xfs_ilog_fext(whichfork);
2817                         break;
2818                 }
2819                 if ((error = xfs_btree_delete(cur, &i)))
2820                         goto done;
2821                 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2822                 break;
2823
2824         case 2:
2825                 /*
2826                  * Deleting the first part of the extent.
2827                  */
2828                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2829                 xfs_bmbt_set_startoff(ep, del_endoff);
2830                 temp = got.br_blockcount - del->br_blockcount;
2831                 xfs_bmbt_set_blockcount(ep, temp);
2832                 if (delay) {
2833                         temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2834                                 da_old);
2835                         xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
2836                         trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2837                         da_new = temp;
2838                         break;
2839                 }
2840                 xfs_bmbt_set_startblock(ep, del_endblock);
2841                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2842                 if (!cur) {
2843                         flags |= xfs_ilog_fext(whichfork);
2844                         break;
2845                 }
2846                 if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
2847                                 got.br_blockcount - del->br_blockcount,
2848                                 got.br_state)))
2849                         goto done;
2850                 break;
2851
2852         case 1:
2853                 /*
2854                  * Deleting the last part of the extent.
2855                  */
2856                 temp = got.br_blockcount - del->br_blockcount;
2857                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2858                 xfs_bmbt_set_blockcount(ep, temp);
2859                 if (delay) {
2860                         temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2861                                 da_old);
2862                         xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
2863                         trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2864                         da_new = temp;
2865                         break;
2866                 }
2867                 trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
2868                 if (!cur) {
2869                         flags |= xfs_ilog_fext(whichfork);
2870                         break;
2871                 }
2872                 if ((error = xfs_bmbt_update(cur, got.br_startoff,
2873                                 got.br_startblock,
2874                                 got.br_blockcount - del->br_blockcount,
2875                                 got.br_state)))
2876                         goto done;
2877                 break;
2878
2879         case 0:
2880                 /*
2881                  * Deleting the middle of the extent.
2882                  */
2883                 temp = del->br_startoff - got.br_startoff;
2884                 trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
2885                 xfs_bmbt_set_blockcount(ep, temp);
2886                 new.br_startoff = del_endoff;
2887                 temp2 = got_endoff - del_endoff;
2888                 new.br_blockcount = temp2;
2889                 new.br_state = got.br_state;
2890                 if (!delay) {
2891                         new.br_startblock = del_endblock;
2892                         flags |= XFS_ILOG_CORE;
2893                         if (cur) {
2894                                 if ((error = xfs_bmbt_update(cur,
2895                                                 got.br_startoff,
2896                                                 got.br_startblock, temp,
2897                                                 got.br_state)))
2898                                         goto done;
2899                                 if ((error = xfs_btree_increment(cur, 0, &i)))
2900                                         goto done;
2901                                 cur->bc_rec.b = new;
2902                                 error = xfs_btree_insert(cur, &i);
2903                                 if (error && error != ENOSPC)
2904                                         goto done;
2905                                 /*
2906                                  * If get no-space back from btree insert,
2907                                  * it tried a split, and we have a zero
2908                                  * block reservation.
2909                                  * Fix up our state and return the error.
2910                                  */
2911                                 if (error == ENOSPC) {
2912                                         /*
2913                                          * Reset the cursor, don't trust
2914                                          * it after any insert operation.
2915                                          */
2916                                         if ((error = xfs_bmbt_lookup_eq(cur,
2917                                                         got.br_startoff,
2918                                                         got.br_startblock,
2919                                                         temp, &i)))
2920                                                 goto done;
2921                                         XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2922                                         /*
2923                                          * Update the btree record back
2924                                          * to the original value.
2925                                          */
2926                                         if ((error = xfs_bmbt_update(cur,
2927                                                         got.br_startoff,
2928                                                         got.br_startblock,
2929                                                         got.br_blockcount,
2930                                                         got.br_state)))
2931                                                 goto done;
2932                                         /*
2933                                          * Reset the extent record back
2934                                          * to the original value.
2935                                          */
2936                                         xfs_bmbt_set_blockcount(ep,
2937                                                 got.br_blockcount);
2938                                         flags = 0;
2939                                         error = XFS_ERROR(ENOSPC);
2940                                         goto done;
2941                                 }
2942                                 XFS_WANT_CORRUPTED_GOTO(i == 1, done);
2943                         } else
2944                                 flags |= xfs_ilog_fext(whichfork);
2945                         XFS_IFORK_NEXT_SET(ip, whichfork,
2946                                 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
2947                 } else {
2948                         ASSERT(whichfork == XFS_DATA_FORK);
2949                         temp = xfs_bmap_worst_indlen(ip, temp);
2950                         xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
2951                         temp2 = xfs_bmap_worst_indlen(ip, temp2);
2952                         new.br_startblock = nullstartblock((int)temp2);
2953                         da_new = temp + temp2;
2954                         while (da_new > da_old) {
2955                                 if (temp) {
2956                                         temp--;
2957                                         da_new--;
2958                                         xfs_bmbt_set_startblock(ep,
2959                                                 nullstartblock((int)temp));
2960                                 }
2961                &nbs