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xfs_bmap_btree.c
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1 /*
2  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3  * All Rights Reserved.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it would be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write the Free Software Foundation,
16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_trans.h"
24 #include "xfs_sb.h"
25 #include "xfs_ag.h"
26 #include "xfs_mount.h"
27 #include "xfs_bmap_btree.h"
28 #include "xfs_alloc_btree.h"
29 #include "xfs_ialloc_btree.h"
30 #include "xfs_dinode.h"
31 #include "xfs_inode.h"
32 #include "xfs_inode_item.h"
33 #include "xfs_alloc.h"
34 #include "xfs_btree.h"
35 #include "xfs_itable.h"
36 #include "xfs_bmap.h"
37 #include "xfs_error.h"
38 #include "xfs_quota.h"
39 
40 /*
41  * Determine the extent state.
42  */
43 /* ARGSUSED */
46  xfs_filblks_t blks,
47  int extent_flag)
48 {
49  if (extent_flag) {
50  ASSERT(blks != 0); /* saved for DMIG */
51  return XFS_EXT_UNWRITTEN;
52  }
53  return XFS_EXT_NORM;
54 }
55 
56 /*
57  * Convert on-disk form of btree root to in-memory form.
58  */
59 void
61  struct xfs_mount *mp,
63  int dblocklen,
64  struct xfs_btree_block *rblock,
65  int rblocklen)
66 {
67  int dmxr;
68  xfs_bmbt_key_t *fkp;
69  __be64 *fpp;
70  xfs_bmbt_key_t *tkp;
71  __be64 *tpp;
72 
74  rblock->bb_level = dblock->bb_level;
75  ASSERT(be16_to_cpu(rblock->bb_level) > 0);
76  rblock->bb_numrecs = dblock->bb_numrecs;
77  rblock->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
78  rblock->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
79  dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0);
80  fkp = XFS_BMDR_KEY_ADDR(dblock, 1);
81  tkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
82  fpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
83  tpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
84  dmxr = be16_to_cpu(dblock->bb_numrecs);
85  memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
86  memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
87 }
88 
89 /*
90  * Convert a compressed bmap extent record to an uncompressed form.
91  * This code must be in sync with the routines xfs_bmbt_get_startoff,
92  * xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state.
93  */
94 STATIC void
96  __uint64_t l0,
97  __uint64_t l1,
99 {
100  int ext_flag;
102 
103  ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN));
104  s->br_startoff = ((xfs_fileoff_t)l0 &
105  xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
106 #if XFS_BIG_BLKNOS
107  s->br_startblock = (((xfs_fsblock_t)l0 & xfs_mask64lo(9)) << 43) |
108  (((xfs_fsblock_t)l1) >> 21);
109 #else
110 #ifdef DEBUG
111  {
112  xfs_dfsbno_t b;
113 
114  b = (((xfs_dfsbno_t)l0 & xfs_mask64lo(9)) << 43) |
115  (((xfs_dfsbno_t)l1) >> 21);
116  ASSERT((b >> 32) == 0 || isnulldstartblock(b));
118  }
119 #else /* !DEBUG */
120  s->br_startblock = (xfs_fsblock_t)(((xfs_dfsbno_t)l1) >> 21);
121 #endif /* DEBUG */
122 #endif /* XFS_BIG_BLKNOS */
123  s->br_blockcount = (xfs_filblks_t)(l1 & xfs_mask64lo(21));
124  /* This is xfs_extent_state() in-line */
125  if (ext_flag) {
126  ASSERT(s->br_blockcount != 0); /* saved for DMIG */
127  st = XFS_EXT_UNWRITTEN;
128  } else
129  st = XFS_EXT_NORM;
130  s->br_state = st;
131 }
132 
133 void
137 {
138  __xfs_bmbt_get_all(r->l0, r->l1, s);
139 }
140 
141 /*
142  * Extract the blockcount field from an in memory bmap extent record.
143  */
147 {
148  return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21));
149 }
150 
151 /*
152  * Extract the startblock field from an in memory bmap extent record.
153  */
157 {
158 #if XFS_BIG_BLKNOS
159  return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) |
160  (((xfs_fsblock_t)r->l1) >> 21);
161 #else
162 #ifdef DEBUG
163  xfs_dfsbno_t b;
164 
165  b = (((xfs_dfsbno_t)r->l0 & xfs_mask64lo(9)) << 43) |
166  (((xfs_dfsbno_t)r->l1) >> 21);
167  ASSERT((b >> 32) == 0 || isnulldstartblock(b));
168  return (xfs_fsblock_t)b;
169 #else /* !DEBUG */
170  return (xfs_fsblock_t)(((xfs_dfsbno_t)r->l1) >> 21);
171 #endif /* DEBUG */
172 #endif /* XFS_BIG_BLKNOS */
173 }
174 
175 /*
176  * Extract the startoff field from an in memory bmap extent record.
177  */
181 {
182  return ((xfs_fileoff_t)r->l0 &
183  xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
184 }
185 
189 {
190  int ext_flag;
191 
192  ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN));
194  ext_flag);
195 }
196 
197 /*
198  * Extract the blockcount field from an on disk bmap extent record.
199  */
202  xfs_bmbt_rec_t *r)
203 {
204  return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21));
205 }
206 
207 /*
208  * Extract the startoff field from a disk format bmap extent record.
209  */
212  xfs_bmbt_rec_t *r)
213 {
214  return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
215  xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
216 }
217 
218 
219 /*
220  * Set all the fields in a bmap extent record from the arguments.
221  */
222 void
225  xfs_fileoff_t startoff,
226  xfs_fsblock_t startblock,
227  xfs_filblks_t blockcount,
229 {
230  int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
231 
232  ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
233  ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
234  ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
235 
236 #if XFS_BIG_BLKNOS
237  ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
238 
239  r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
240  ((xfs_bmbt_rec_base_t)startoff << 9) |
241  ((xfs_bmbt_rec_base_t)startblock >> 43);
242  r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
243  ((xfs_bmbt_rec_base_t)blockcount &
244  (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
245 #else /* !XFS_BIG_BLKNOS */
246  if (isnullstartblock(startblock)) {
247  r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
248  ((xfs_bmbt_rec_base_t)startoff << 9) |
249  (xfs_bmbt_rec_base_t)xfs_mask64lo(9);
250  r->l1 = xfs_mask64hi(11) |
251  ((xfs_bmbt_rec_base_t)startblock << 21) |
252  ((xfs_bmbt_rec_base_t)blockcount &
253  (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
254  } else {
255  r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
256  ((xfs_bmbt_rec_base_t)startoff << 9);
257  r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
258  ((xfs_bmbt_rec_base_t)blockcount &
259  (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
260  }
261 #endif /* XFS_BIG_BLKNOS */
262 }
263 
264 /*
265  * Set all the fields in a bmap extent record from the uncompressed form.
266  */
267 void
271 {
273  s->br_blockcount, s->br_state);
274 }
275 
276 
277 /*
278  * Set all the fields in a disk format bmap extent record from the arguments.
279  */
280 void
282  xfs_bmbt_rec_t *r,
283  xfs_fileoff_t startoff,
284  xfs_fsblock_t startblock,
285  xfs_filblks_t blockcount,
287 {
288  int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
289 
290  ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
291  ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
292  ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
293 
294 #if XFS_BIG_BLKNOS
295  ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
296 
297  r->l0 = cpu_to_be64(
298  ((xfs_bmbt_rec_base_t)extent_flag << 63) |
299  ((xfs_bmbt_rec_base_t)startoff << 9) |
300  ((xfs_bmbt_rec_base_t)startblock >> 43));
301  r->l1 = cpu_to_be64(
302  ((xfs_bmbt_rec_base_t)startblock << 21) |
303  ((xfs_bmbt_rec_base_t)blockcount &
304  (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
305 #else /* !XFS_BIG_BLKNOS */
306  if (isnullstartblock(startblock)) {
307  r->l0 = cpu_to_be64(
308  ((xfs_bmbt_rec_base_t)extent_flag << 63) |
309  ((xfs_bmbt_rec_base_t)startoff << 9) |
310  (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
311  r->l1 = cpu_to_be64(xfs_mask64hi(11) |
312  ((xfs_bmbt_rec_base_t)startblock << 21) |
313  ((xfs_bmbt_rec_base_t)blockcount &
314  (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
315  } else {
316  r->l0 = cpu_to_be64(
317  ((xfs_bmbt_rec_base_t)extent_flag << 63) |
318  ((xfs_bmbt_rec_base_t)startoff << 9));
319  r->l1 = cpu_to_be64(
320  ((xfs_bmbt_rec_base_t)startblock << 21) |
321  ((xfs_bmbt_rec_base_t)blockcount &
322  (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
323  }
324 #endif /* XFS_BIG_BLKNOS */
325 }
326 
327 /*
328  * Set all the fields in a bmap extent record from the uncompressed form.
329  */
330 STATIC void
332  xfs_bmbt_rec_t *r,
334 {
336  s->br_blockcount, s->br_state);
337 }
338 
339 /*
340  * Set the blockcount field in a bmap extent record.
341  */
342 void
346 {
347  ASSERT((v & xfs_mask64hi(43)) == 0);
348  r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64hi(43)) |
349  (xfs_bmbt_rec_base_t)(v & xfs_mask64lo(21));
350 }
351 
352 /*
353  * Set the startblock field in a bmap extent record.
354  */
355 void
359 {
360 #if XFS_BIG_BLKNOS
361  ASSERT((v & xfs_mask64hi(12)) == 0);
362  r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64hi(55)) |
363  (xfs_bmbt_rec_base_t)(v >> 43);
364  r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)) |
365  (xfs_bmbt_rec_base_t)(v << 21);
366 #else /* !XFS_BIG_BLKNOS */
367  if (isnullstartblock(v)) {
368  r->l0 |= (xfs_bmbt_rec_base_t)xfs_mask64lo(9);
369  r->l1 = (xfs_bmbt_rec_base_t)xfs_mask64hi(11) |
370  ((xfs_bmbt_rec_base_t)v << 21) |
371  (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
372  } else {
373  r->l0 &= ~(xfs_bmbt_rec_base_t)xfs_mask64lo(9);
374  r->l1 = ((xfs_bmbt_rec_base_t)v << 21) |
375  (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
376  }
377 #endif /* XFS_BIG_BLKNOS */
378 }
379 
380 /*
381  * Set the startoff field in a bmap extent record.
382  */
383 void
387 {
388  ASSERT((v & xfs_mask64hi(9)) == 0);
389  r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) xfs_mask64hi(1)) |
390  ((xfs_bmbt_rec_base_t)v << 9) |
391  (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
392 }
393 
394 /*
395  * Set the extent state field in a bmap extent record.
396  */
397 void
400  xfs_exntst_t v)
401 {
402  ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN);
403  if (v == XFS_EXT_NORM)
404  r->l0 &= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN);
405  else
406  r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN);
407 }
408 
409 /*
410  * Convert in-memory form of btree root to on-disk form.
411  */
412 void
414  struct xfs_mount *mp,
415  struct xfs_btree_block *rblock,
416  int rblocklen,
418  int dblocklen)
419 {
420  int dmxr;
421  xfs_bmbt_key_t *fkp;
422  __be64 *fpp;
423  xfs_bmbt_key_t *tkp;
424  __be64 *tpp;
425 
427  ASSERT(rblock->bb_u.l.bb_leftsib == cpu_to_be64(NULLDFSBNO));
428  ASSERT(rblock->bb_u.l.bb_rightsib == cpu_to_be64(NULLDFSBNO));
429  ASSERT(rblock->bb_level != 0);
430  dblock->bb_level = rblock->bb_level;
431  dblock->bb_numrecs = rblock->bb_numrecs;
432  dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0);
433  fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
434  tkp = XFS_BMDR_KEY_ADDR(dblock, 1);
435  fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
436  tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
437  dmxr = be16_to_cpu(dblock->bb_numrecs);
438  memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
439  memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
440 }
441 
442 /*
443  * Check extent records, which have just been read, for
444  * any bit in the extent flag field. ASSERT on debug
445  * kernels, as this condition should not occur.
446  * Return an error condition (1) if any flags found,
447  * otherwise return 0.
448  */
449 
450 int
452  xfs_ifork_t *ifp,
454  xfs_extnum_t num)
455 {
456  for (; num > 0; num--, idx++) {
457  xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
458  if ((ep->l0 >>
459  (64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
460  ASSERT(0);
461  return 1;
462  }
463  }
464  return 0;
465 }
466 
467 
468 STATIC struct xfs_btree_cur *
470  struct xfs_btree_cur *cur)
471 {
472  struct xfs_btree_cur *new;
473 
474  new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp,
475  cur->bc_private.b.ip, cur->bc_private.b.whichfork);
476 
477  /*
478  * Copy the firstblock, flist, and flags values,
479  * since init cursor doesn't get them.
480  */
481  new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
482  new->bc_private.b.flist = cur->bc_private.b.flist;
483  new->bc_private.b.flags = cur->bc_private.b.flags;
484 
485  return new;
486 }
487 
488 STATIC void
490  struct xfs_btree_cur *src,
491  struct xfs_btree_cur *dst)
492 {
493  ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
494  (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
495  ASSERT(dst->bc_private.b.flist == src->bc_private.b.flist);
496 
497  dst->bc_private.b.allocated += src->bc_private.b.allocated;
498  dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
499 
500  src->bc_private.b.allocated = 0;
501 }
502 
503 STATIC int
505  struct xfs_btree_cur *cur,
506  union xfs_btree_ptr *start,
507  union xfs_btree_ptr *new,
508  int length,
509  int *stat)
510 {
511  xfs_alloc_arg_t args; /* block allocation args */
512  int error; /* error return value */
513 
514  memset(&args, 0, sizeof(args));
515  args.tp = cur->bc_tp;
516  args.mp = cur->bc_mp;
517  args.fsbno = cur->bc_private.b.firstblock;
518  args.firstblock = args.fsbno;
519 
520  if (args.fsbno == NULLFSBLOCK) {
521  args.fsbno = be64_to_cpu(start->l);
523  /*
524  * Make sure there is sufficient room left in the AG to
525  * complete a full tree split for an extent insert. If
526  * we are converting the middle part of an extent then
527  * we may need space for two tree splits.
528  *
529  * We are relying on the caller to make the correct block
530  * reservation for this operation to succeed. If the
531  * reservation amount is insufficient then we may fail a
532  * block allocation here and corrupt the filesystem.
533  */
534  args.minleft = xfs_trans_get_block_res(args.tp);
535  } else if (cur->bc_private.b.flist->xbf_low) {
537  } else {
539  }
540 
541  args.minlen = args.maxlen = args.prod = 1;
542  args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
543  if (!args.wasdel && xfs_trans_get_block_res(args.tp) == 0) {
544  error = XFS_ERROR(ENOSPC);
545  goto error0;
546  }
547  error = xfs_alloc_vextent(&args);
548  if (error)
549  goto error0;
550 
551  if (args.fsbno == NULLFSBLOCK && args.minleft) {
552  /*
553  * Could not find an AG with enough free space to satisfy
554  * a full btree split. Try again without minleft and if
555  * successful activate the lowspace algorithm.
556  */
557  args.fsbno = 0;
559  args.minleft = 0;
560  error = xfs_alloc_vextent(&args);
561  if (error)
562  goto error0;
563  cur->bc_private.b.flist->xbf_low = 1;
564  }
565  if (args.fsbno == NULLFSBLOCK) {
566  XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
567  *stat = 0;
568  return 0;
569  }
570  ASSERT(args.len == 1);
571  cur->bc_private.b.firstblock = args.fsbno;
572  cur->bc_private.b.allocated++;
573  cur->bc_private.b.ip->i_d.di_nblocks++;
577 
578  new->l = cpu_to_be64(args.fsbno);
579 
580  XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
581  *stat = 1;
582  return 0;
583 
584  error0:
585  XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
586  return error;
587 }
588 
589 STATIC int
591  struct xfs_btree_cur *cur,
592  struct xfs_buf *bp)
593 {
594  struct xfs_mount *mp = cur->bc_mp;
595  struct xfs_inode *ip = cur->bc_private.b.ip;
596  struct xfs_trans *tp = cur->bc_tp;
598 
599  xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp);
600  ip->i_d.di_nblocks--;
601 
604  xfs_trans_binval(tp, bp);
605  return 0;
606 }
607 
608 STATIC int
610  struct xfs_btree_cur *cur,
611  int level)
612 {
613  if (level == cur->bc_nlevels - 1) {
614  struct xfs_ifork *ifp;
615 
616  ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
617  cur->bc_private.b.whichfork);
618 
619  return xfs_bmbt_maxrecs(cur->bc_mp,
620  ifp->if_broot_bytes, level == 0) / 2;
621  }
622 
623  return cur->bc_mp->m_bmap_dmnr[level != 0];
624 }
625 
626 int
628  struct xfs_btree_cur *cur,
629  int level)
630 {
631  if (level == cur->bc_nlevels - 1) {
632  struct xfs_ifork *ifp;
633 
634  ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
635  cur->bc_private.b.whichfork);
636 
637  return xfs_bmbt_maxrecs(cur->bc_mp,
638  ifp->if_broot_bytes, level == 0);
639  }
640 
641  return cur->bc_mp->m_bmap_dmxr[level != 0];
642 
643 }
644 
645 /*
646  * Get the maximum records we could store in the on-disk format.
647  *
648  * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
649  * for the root node this checks the available space in the dinode fork
650  * so that we can resize the in-memory buffer to match it. After a
651  * resize to the maximum size this function returns the same value
652  * as xfs_bmbt_get_maxrecs for the root node, too.
653  */
654 STATIC int
656  struct xfs_btree_cur *cur,
657  int level)
658 {
659  if (level != cur->bc_nlevels - 1)
660  return cur->bc_mp->m_bmap_dmxr[level != 0];
661  return xfs_bmdr_maxrecs(cur->bc_mp, cur->bc_private.b.forksize,
662  level == 0);
663 }
664 
665 STATIC void
667  union xfs_btree_key *key,
668  union xfs_btree_rec *rec)
669 {
670  key->bmbt.br_startoff =
672 }
673 
674 STATIC void
676  union xfs_btree_key *key,
677  union xfs_btree_rec *rec)
678 {
679  ASSERT(key->bmbt.br_startoff != 0);
680 
682  0, 0, XFS_EXT_NORM);
683 }
684 
685 STATIC void
687  struct xfs_btree_cur *cur,
688  union xfs_btree_rec *rec)
689 {
690  xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
691 }
692 
693 STATIC void
695  struct xfs_btree_cur *cur,
696  union xfs_btree_ptr *ptr)
697 {
698  ptr->l = 0;
699 }
700 
701 STATIC __int64_t
703  struct xfs_btree_cur *cur,
704  union xfs_btree_key *key)
705 {
706  return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
707  cur->bc_rec.b.br_startoff;
708 }
709 
710 #ifdef DEBUG
711 STATIC int
712 xfs_bmbt_keys_inorder(
713  struct xfs_btree_cur *cur,
714  union xfs_btree_key *k1,
715  union xfs_btree_key *k2)
716 {
717  return be64_to_cpu(k1->bmbt.br_startoff) <
719 }
720 
721 STATIC int
722 xfs_bmbt_recs_inorder(
723  struct xfs_btree_cur *cur,
724  union xfs_btree_rec *r1,
725  union xfs_btree_rec *r2)
726 {
727  return xfs_bmbt_disk_get_startoff(&r1->bmbt) +
730 }
731 #endif /* DEBUG */
732 
733 static const struct xfs_btree_ops xfs_bmbt_ops = {
734  .rec_len = sizeof(xfs_bmbt_rec_t),
735  .key_len = sizeof(xfs_bmbt_key_t),
736 
737  .dup_cursor = xfs_bmbt_dup_cursor,
738  .update_cursor = xfs_bmbt_update_cursor,
739  .alloc_block = xfs_bmbt_alloc_block,
740  .free_block = xfs_bmbt_free_block,
741  .get_maxrecs = xfs_bmbt_get_maxrecs,
742  .get_minrecs = xfs_bmbt_get_minrecs,
743  .get_dmaxrecs = xfs_bmbt_get_dmaxrecs,
744  .init_key_from_rec = xfs_bmbt_init_key_from_rec,
745  .init_rec_from_key = xfs_bmbt_init_rec_from_key,
746  .init_rec_from_cur = xfs_bmbt_init_rec_from_cur,
747  .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur,
748  .key_diff = xfs_bmbt_key_diff,
749 #ifdef DEBUG
750  .keys_inorder = xfs_bmbt_keys_inorder,
751  .recs_inorder = xfs_bmbt_recs_inorder,
752 #endif
753 };
754 
755 /*
756  * Allocate a new bmap btree cursor.
757  */
758 struct xfs_btree_cur * /* new bmap btree cursor */
760  struct xfs_mount *mp, /* file system mount point */
761  struct xfs_trans *tp, /* transaction pointer */
762  struct xfs_inode *ip, /* inode owning the btree */
763  int whichfork) /* data or attr fork */
764 {
765  struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
766  struct xfs_btree_cur *cur;
767 
769 
770  cur->bc_tp = tp;
771  cur->bc_mp = mp;
772  cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
773  cur->bc_btnum = XFS_BTNUM_BMAP;
774  cur->bc_blocklog = mp->m_sb.sb_blocklog;
775 
776  cur->bc_ops = &xfs_bmbt_ops;
778 
779  cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
780  cur->bc_private.b.ip = ip;
781  cur->bc_private.b.firstblock = NULLFSBLOCK;
782  cur->bc_private.b.flist = NULL;
783  cur->bc_private.b.allocated = 0;
784  cur->bc_private.b.flags = 0;
785  cur->bc_private.b.whichfork = whichfork;
786 
787  return cur;
788 }
789 
790 /*
791  * Calculate number of records in a bmap btree block.
792  */
793 int
795  struct xfs_mount *mp,
796  int blocklen,
797  int leaf)
798 {
799  blocklen -= XFS_BMBT_BLOCK_LEN(mp);
800 
801  if (leaf)
802  return blocklen / sizeof(xfs_bmbt_rec_t);
803  return blocklen / (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t));
804 }
805 
806 /*
807  * Calculate number of records in a bmap btree inode root.
808  */
809 int
811  struct xfs_mount *mp,
812  int blocklen,
813  int leaf)
814 {
815  blocklen -= sizeof(xfs_bmdr_block_t);
816 
817  if (leaf)
818  return blocklen / sizeof(xfs_bmdr_rec_t);
819  return blocklen / (sizeof(xfs_bmdr_key_t) + sizeof(xfs_bmdr_ptr_t));
820 }