2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
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.
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.
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
18 #include "libxfs_priv.h"
20 #include "xfs_shared.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
25 #include "xfs_mount.h"
26 #include "xfs_defer.h"
27 #include "xfs_inode.h"
28 #include "xfs_trans.h"
29 #include "xfs_alloc.h"
30 #include "xfs_btree.h"
31 #include "xfs_bmap_btree.h"
33 #include "xfs_trace.h"
34 #include "xfs_cksum.h"
38 * Determine the extent state.
47 ASSERT(blks
!= 0); /* saved for DMIG */
48 return XFS_EXT_UNWRITTEN
;
54 * Convert on-disk form of btree root to in-memory form.
59 xfs_bmdr_block_t
*dblock
,
61 struct xfs_btree_block
*rblock
,
64 struct xfs_mount
*mp
= ip
->i_mount
;
71 if (xfs_sb_version_hascrc(&mp
->m_sb
))
72 xfs_btree_init_block_int(mp
, rblock
, XFS_BUF_DADDR_NULL
,
73 XFS_BMAP_CRC_MAGIC
, 0, 0, ip
->i_ino
,
74 XFS_BTREE_LONG_PTRS
| XFS_BTREE_CRC_BLOCKS
);
76 xfs_btree_init_block_int(mp
, rblock
, XFS_BUF_DADDR_NULL
,
77 XFS_BMAP_MAGIC
, 0, 0, ip
->i_ino
,
80 rblock
->bb_level
= dblock
->bb_level
;
81 ASSERT(be16_to_cpu(rblock
->bb_level
) > 0);
82 rblock
->bb_numrecs
= dblock
->bb_numrecs
;
83 dmxr
= xfs_bmdr_maxrecs(dblocklen
, 0);
84 fkp
= XFS_BMDR_KEY_ADDR(dblock
, 1);
85 tkp
= XFS_BMBT_KEY_ADDR(mp
, rblock
, 1);
86 fpp
= XFS_BMDR_PTR_ADDR(dblock
, 1, dmxr
);
87 tpp
= XFS_BMAP_BROOT_PTR_ADDR(mp
, rblock
, 1, rblocklen
);
88 dmxr
= be16_to_cpu(dblock
->bb_numrecs
);
89 memcpy(tkp
, fkp
, sizeof(*fkp
) * dmxr
);
90 memcpy(tpp
, fpp
, sizeof(*fpp
) * dmxr
);
94 * Convert a compressed bmap extent record to an uncompressed form.
95 * This code must be in sync with the routines xfs_bmbt_get_startoff,
96 * xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state.
107 ext_flag
= (int)(l0
>> (64 - BMBT_EXNTFLAG_BITLEN
));
108 s
->br_startoff
= ((xfs_fileoff_t
)l0
&
109 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN
)) >> 9;
110 s
->br_startblock
= (((xfs_fsblock_t
)l0
& xfs_mask64lo(9)) << 43) |
111 (((xfs_fsblock_t
)l1
) >> 21);
112 s
->br_blockcount
= (xfs_filblks_t
)(l1
& xfs_mask64lo(21));
113 /* This is xfs_extent_state() in-line */
115 ASSERT(s
->br_blockcount
!= 0); /* saved for DMIG */
116 st
= XFS_EXT_UNWRITTEN
;
124 xfs_bmbt_rec_host_t
*r
,
127 __xfs_bmbt_get_all(r
->l0
, r
->l1
, s
);
131 * Extract the blockcount field from an in memory bmap extent record.
134 xfs_bmbt_get_blockcount(
135 xfs_bmbt_rec_host_t
*r
)
137 return (xfs_filblks_t
)(r
->l1
& xfs_mask64lo(21));
141 * Extract the startblock field from an in memory bmap extent record.
144 xfs_bmbt_get_startblock(
145 xfs_bmbt_rec_host_t
*r
)
147 return (((xfs_fsblock_t
)r
->l0
& xfs_mask64lo(9)) << 43) |
148 (((xfs_fsblock_t
)r
->l1
) >> 21);
152 * Extract the startoff field from an in memory bmap extent record.
155 xfs_bmbt_get_startoff(
156 xfs_bmbt_rec_host_t
*r
)
158 return ((xfs_fileoff_t
)r
->l0
&
159 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN
)) >> 9;
164 xfs_bmbt_rec_host_t
*r
)
168 ext_flag
= (int)((r
->l0
) >> (64 - BMBT_EXNTFLAG_BITLEN
));
169 return xfs_extent_state(xfs_bmbt_get_blockcount(r
),
174 * Extract the blockcount field from an on disk bmap extent record.
177 xfs_bmbt_disk_get_blockcount(
180 return (xfs_filblks_t
)(be64_to_cpu(r
->l1
) & xfs_mask64lo(21));
184 * Extract the startoff field from a disk format bmap extent record.
187 xfs_bmbt_disk_get_startoff(
190 return ((xfs_fileoff_t
)be64_to_cpu(r
->l0
) &
191 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN
)) >> 9;
196 * Set all the fields in a bmap extent record from the arguments.
200 xfs_bmbt_rec_host_t
*r
,
201 xfs_fileoff_t startoff
,
202 xfs_fsblock_t startblock
,
203 xfs_filblks_t blockcount
,
206 int extent_flag
= (state
== XFS_EXT_NORM
) ? 0 : 1;
208 ASSERT(state
== XFS_EXT_NORM
|| state
== XFS_EXT_UNWRITTEN
);
209 ASSERT((startoff
& xfs_mask64hi(64-BMBT_STARTOFF_BITLEN
)) == 0);
210 ASSERT((blockcount
& xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN
)) == 0);
212 ASSERT((startblock
& xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN
)) == 0);
214 r
->l0
= ((xfs_bmbt_rec_base_t
)extent_flag
<< 63) |
215 ((xfs_bmbt_rec_base_t
)startoff
<< 9) |
216 ((xfs_bmbt_rec_base_t
)startblock
>> 43);
217 r
->l1
= ((xfs_bmbt_rec_base_t
)startblock
<< 21) |
218 ((xfs_bmbt_rec_base_t
)blockcount
&
219 (xfs_bmbt_rec_base_t
)xfs_mask64lo(21));
223 * Set all the fields in a bmap extent record from the uncompressed form.
227 xfs_bmbt_rec_host_t
*r
,
230 xfs_bmbt_set_allf(r
, s
->br_startoff
, s
->br_startblock
,
231 s
->br_blockcount
, s
->br_state
);
236 * Set all the fields in a disk format bmap extent record from the arguments.
239 xfs_bmbt_disk_set_allf(
241 xfs_fileoff_t startoff
,
242 xfs_fsblock_t startblock
,
243 xfs_filblks_t blockcount
,
246 int extent_flag
= (state
== XFS_EXT_NORM
) ? 0 : 1;
248 ASSERT(state
== XFS_EXT_NORM
|| state
== XFS_EXT_UNWRITTEN
);
249 ASSERT((startoff
& xfs_mask64hi(64-BMBT_STARTOFF_BITLEN
)) == 0);
250 ASSERT((blockcount
& xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN
)) == 0);
251 ASSERT((startblock
& xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN
)) == 0);
254 ((xfs_bmbt_rec_base_t
)extent_flag
<< 63) |
255 ((xfs_bmbt_rec_base_t
)startoff
<< 9) |
256 ((xfs_bmbt_rec_base_t
)startblock
>> 43));
258 ((xfs_bmbt_rec_base_t
)startblock
<< 21) |
259 ((xfs_bmbt_rec_base_t
)blockcount
&
260 (xfs_bmbt_rec_base_t
)xfs_mask64lo(21)));
264 * Set all the fields in a bmap extent record from the uncompressed form.
267 xfs_bmbt_disk_set_all(
271 xfs_bmbt_disk_set_allf(r
, s
->br_startoff
, s
->br_startblock
,
272 s
->br_blockcount
, s
->br_state
);
276 * Set the blockcount field in a bmap extent record.
279 xfs_bmbt_set_blockcount(
280 xfs_bmbt_rec_host_t
*r
,
283 ASSERT((v
& xfs_mask64hi(43)) == 0);
284 r
->l1
= (r
->l1
& (xfs_bmbt_rec_base_t
)xfs_mask64hi(43)) |
285 (xfs_bmbt_rec_base_t
)(v
& xfs_mask64lo(21));
289 * Set the startblock field in a bmap extent record.
292 xfs_bmbt_set_startblock(
293 xfs_bmbt_rec_host_t
*r
,
296 ASSERT((v
& xfs_mask64hi(12)) == 0);
297 r
->l0
= (r
->l0
& (xfs_bmbt_rec_base_t
)xfs_mask64hi(55)) |
298 (xfs_bmbt_rec_base_t
)(v
>> 43);
299 r
->l1
= (r
->l1
& (xfs_bmbt_rec_base_t
)xfs_mask64lo(21)) |
300 (xfs_bmbt_rec_base_t
)(v
<< 21);
304 * Set the startoff field in a bmap extent record.
307 xfs_bmbt_set_startoff(
308 xfs_bmbt_rec_host_t
*r
,
311 ASSERT((v
& xfs_mask64hi(9)) == 0);
312 r
->l0
= (r
->l0
& (xfs_bmbt_rec_base_t
) xfs_mask64hi(1)) |
313 ((xfs_bmbt_rec_base_t
)v
<< 9) |
314 (r
->l0
& (xfs_bmbt_rec_base_t
)xfs_mask64lo(9));
318 * Set the extent state field in a bmap extent record.
322 xfs_bmbt_rec_host_t
*r
,
325 ASSERT(v
== XFS_EXT_NORM
|| v
== XFS_EXT_UNWRITTEN
);
326 if (v
== XFS_EXT_NORM
)
327 r
->l0
&= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN
);
329 r
->l0
|= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN
);
333 * Convert in-memory form of btree root to on-disk form.
337 struct xfs_mount
*mp
,
338 struct xfs_btree_block
*rblock
,
340 xfs_bmdr_block_t
*dblock
,
349 if (xfs_sb_version_hascrc(&mp
->m_sb
)) {
350 ASSERT(rblock
->bb_magic
== cpu_to_be32(XFS_BMAP_CRC_MAGIC
));
351 ASSERT(uuid_equal(&rblock
->bb_u
.l
.bb_uuid
,
352 &mp
->m_sb
.sb_meta_uuid
));
353 ASSERT(rblock
->bb_u
.l
.bb_blkno
==
354 cpu_to_be64(XFS_BUF_DADDR_NULL
));
356 ASSERT(rblock
->bb_magic
== cpu_to_be32(XFS_BMAP_MAGIC
));
357 ASSERT(rblock
->bb_u
.l
.bb_leftsib
== cpu_to_be64(NULLFSBLOCK
));
358 ASSERT(rblock
->bb_u
.l
.bb_rightsib
== cpu_to_be64(NULLFSBLOCK
));
359 ASSERT(rblock
->bb_level
!= 0);
360 dblock
->bb_level
= rblock
->bb_level
;
361 dblock
->bb_numrecs
= rblock
->bb_numrecs
;
362 dmxr
= xfs_bmdr_maxrecs(dblocklen
, 0);
363 fkp
= XFS_BMBT_KEY_ADDR(mp
, rblock
, 1);
364 tkp
= XFS_BMDR_KEY_ADDR(dblock
, 1);
365 fpp
= XFS_BMAP_BROOT_PTR_ADDR(mp
, rblock
, 1, rblocklen
);
366 tpp
= XFS_BMDR_PTR_ADDR(dblock
, 1, dmxr
);
367 dmxr
= be16_to_cpu(dblock
->bb_numrecs
);
368 memcpy(tkp
, fkp
, sizeof(*fkp
) * dmxr
);
369 memcpy(tpp
, fpp
, sizeof(*fpp
) * dmxr
);
373 * Check extent records, which have just been read, for
374 * any bit in the extent flag field. ASSERT on debug
375 * kernels, as this condition should not occur.
376 * Return an error condition (1) if any flags found,
377 * otherwise return 0.
381 xfs_check_nostate_extents(
386 for (; num
> 0; num
--, idx
++) {
387 xfs_bmbt_rec_host_t
*ep
= xfs_iext_get_ext(ifp
, idx
);
389 (64 - BMBT_EXNTFLAG_BITLEN
)) != 0) {
398 STATIC
struct xfs_btree_cur
*
400 struct xfs_btree_cur
*cur
)
402 struct xfs_btree_cur
*new;
404 new = xfs_bmbt_init_cursor(cur
->bc_mp
, cur
->bc_tp
,
405 cur
->bc_private
.b
.ip
, cur
->bc_private
.b
.whichfork
);
408 * Copy the firstblock, dfops, and flags values,
409 * since init cursor doesn't get them.
411 new->bc_private
.b
.firstblock
= cur
->bc_private
.b
.firstblock
;
412 new->bc_private
.b
.dfops
= cur
->bc_private
.b
.dfops
;
413 new->bc_private
.b
.flags
= cur
->bc_private
.b
.flags
;
419 xfs_bmbt_update_cursor(
420 struct xfs_btree_cur
*src
,
421 struct xfs_btree_cur
*dst
)
423 ASSERT((dst
->bc_private
.b
.firstblock
!= NULLFSBLOCK
) ||
424 (dst
->bc_private
.b
.ip
->i_d
.di_flags
& XFS_DIFLAG_REALTIME
));
425 ASSERT(dst
->bc_private
.b
.dfops
== src
->bc_private
.b
.dfops
);
427 dst
->bc_private
.b
.allocated
+= src
->bc_private
.b
.allocated
;
428 dst
->bc_private
.b
.firstblock
= src
->bc_private
.b
.firstblock
;
430 src
->bc_private
.b
.allocated
= 0;
434 xfs_bmbt_alloc_block(
435 struct xfs_btree_cur
*cur
,
436 union xfs_btree_ptr
*start
,
437 union xfs_btree_ptr
*new,
440 xfs_alloc_arg_t args
; /* block allocation args */
441 int error
; /* error return value */
443 memset(&args
, 0, sizeof(args
));
444 args
.tp
= cur
->bc_tp
;
445 args
.mp
= cur
->bc_mp
;
446 args
.fsbno
= cur
->bc_private
.b
.firstblock
;
447 args
.firstblock
= args
.fsbno
;
448 xfs_rmap_ino_bmbt_owner(&args
.oinfo
, cur
->bc_private
.b
.ip
->i_ino
,
449 cur
->bc_private
.b
.whichfork
);
451 if (args
.fsbno
== NULLFSBLOCK
) {
452 args
.fsbno
= be64_to_cpu(start
->l
);
453 args
.type
= XFS_ALLOCTYPE_START_BNO
;
455 * Make sure there is sufficient room left in the AG to
456 * complete a full tree split for an extent insert. If
457 * we are converting the middle part of an extent then
458 * we may need space for two tree splits.
460 * We are relying on the caller to make the correct block
461 * reservation for this operation to succeed. If the
462 * reservation amount is insufficient then we may fail a
463 * block allocation here and corrupt the filesystem.
465 args
.minleft
= args
.tp
->t_blk_res
;
466 } else if (cur
->bc_private
.b
.dfops
->dop_low
) {
467 args
.type
= XFS_ALLOCTYPE_START_BNO
;
469 args
.type
= XFS_ALLOCTYPE_NEAR_BNO
;
472 args
.minlen
= args
.maxlen
= args
.prod
= 1;
473 args
.wasdel
= cur
->bc_private
.b
.flags
& XFS_BTCUR_BPRV_WASDEL
;
474 if (!args
.wasdel
&& args
.tp
->t_blk_res
== 0) {
478 error
= xfs_alloc_vextent(&args
);
482 if (args
.fsbno
== NULLFSBLOCK
&& args
.minleft
) {
484 * Could not find an AG with enough free space to satisfy
485 * a full btree split. Try again without minleft and if
486 * successful activate the lowspace algorithm.
489 args
.type
= XFS_ALLOCTYPE_FIRST_AG
;
491 error
= xfs_alloc_vextent(&args
);
494 cur
->bc_private
.b
.dfops
->dop_low
= true;
496 if (args
.fsbno
== NULLFSBLOCK
) {
497 XFS_BTREE_TRACE_CURSOR(cur
, XBT_EXIT
);
501 ASSERT(args
.len
== 1);
502 cur
->bc_private
.b
.firstblock
= args
.fsbno
;
503 cur
->bc_private
.b
.allocated
++;
504 cur
->bc_private
.b
.ip
->i_d
.di_nblocks
++;
505 xfs_trans_log_inode(args
.tp
, cur
->bc_private
.b
.ip
, XFS_ILOG_CORE
);
506 xfs_trans_mod_dquot_byino(args
.tp
, cur
->bc_private
.b
.ip
,
507 XFS_TRANS_DQ_BCOUNT
, 1L);
509 new->l
= cpu_to_be64(args
.fsbno
);
511 XFS_BTREE_TRACE_CURSOR(cur
, XBT_EXIT
);
516 XFS_BTREE_TRACE_CURSOR(cur
, XBT_ERROR
);
522 struct xfs_btree_cur
*cur
,
525 struct xfs_mount
*mp
= cur
->bc_mp
;
526 struct xfs_inode
*ip
= cur
->bc_private
.b
.ip
;
527 struct xfs_trans
*tp
= cur
->bc_tp
;
528 xfs_fsblock_t fsbno
= XFS_DADDR_TO_FSB(mp
, XFS_BUF_ADDR(bp
));
529 struct xfs_owner_info oinfo
;
531 xfs_rmap_ino_bmbt_owner(&oinfo
, ip
->i_ino
, cur
->bc_private
.b
.whichfork
);
532 xfs_bmap_add_free(mp
, cur
->bc_private
.b
.dfops
, fsbno
, 1, &oinfo
);
533 ip
->i_d
.di_nblocks
--;
535 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
536 xfs_trans_mod_dquot_byino(tp
, ip
, XFS_TRANS_DQ_BCOUNT
, -1L);
541 xfs_bmbt_get_minrecs(
542 struct xfs_btree_cur
*cur
,
545 if (level
== cur
->bc_nlevels
- 1) {
546 struct xfs_ifork
*ifp
;
548 ifp
= XFS_IFORK_PTR(cur
->bc_private
.b
.ip
,
549 cur
->bc_private
.b
.whichfork
);
551 return xfs_bmbt_maxrecs(cur
->bc_mp
,
552 ifp
->if_broot_bytes
, level
== 0) / 2;
555 return cur
->bc_mp
->m_bmap_dmnr
[level
!= 0];
559 xfs_bmbt_get_maxrecs(
560 struct xfs_btree_cur
*cur
,
563 if (level
== cur
->bc_nlevels
- 1) {
564 struct xfs_ifork
*ifp
;
566 ifp
= XFS_IFORK_PTR(cur
->bc_private
.b
.ip
,
567 cur
->bc_private
.b
.whichfork
);
569 return xfs_bmbt_maxrecs(cur
->bc_mp
,
570 ifp
->if_broot_bytes
, level
== 0);
573 return cur
->bc_mp
->m_bmap_dmxr
[level
!= 0];
578 * Get the maximum records we could store in the on-disk format.
580 * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
581 * for the root node this checks the available space in the dinode fork
582 * so that we can resize the in-memory buffer to match it. After a
583 * resize to the maximum size this function returns the same value
584 * as xfs_bmbt_get_maxrecs for the root node, too.
587 xfs_bmbt_get_dmaxrecs(
588 struct xfs_btree_cur
*cur
,
591 if (level
!= cur
->bc_nlevels
- 1)
592 return cur
->bc_mp
->m_bmap_dmxr
[level
!= 0];
593 return xfs_bmdr_maxrecs(cur
->bc_private
.b
.forksize
, level
== 0);
597 xfs_bmbt_init_key_from_rec(
598 union xfs_btree_key
*key
,
599 union xfs_btree_rec
*rec
)
601 key
->bmbt
.br_startoff
=
602 cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec
->bmbt
));
606 xfs_bmbt_init_rec_from_cur(
607 struct xfs_btree_cur
*cur
,
608 union xfs_btree_rec
*rec
)
610 xfs_bmbt_disk_set_all(&rec
->bmbt
, &cur
->bc_rec
.b
);
614 xfs_bmbt_init_ptr_from_cur(
615 struct xfs_btree_cur
*cur
,
616 union xfs_btree_ptr
*ptr
)
623 struct xfs_btree_cur
*cur
,
624 union xfs_btree_key
*key
)
626 return (__int64_t
)be64_to_cpu(key
->bmbt
.br_startoff
) -
627 cur
->bc_rec
.b
.br_startoff
;
634 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
635 struct xfs_btree_block
*block
= XFS_BUF_TO_BLOCK(bp
);
638 switch (block
->bb_magic
) {
639 case cpu_to_be32(XFS_BMAP_CRC_MAGIC
):
640 if (!xfs_sb_version_hascrc(&mp
->m_sb
))
642 if (!uuid_equal(&block
->bb_u
.l
.bb_uuid
, &mp
->m_sb
.sb_meta_uuid
))
644 if (be64_to_cpu(block
->bb_u
.l
.bb_blkno
) != bp
->b_bn
)
647 * XXX: need a better way of verifying the owner here. Right now
648 * just make sure there has been one set.
650 if (be64_to_cpu(block
->bb_u
.l
.bb_owner
) == 0)
653 case cpu_to_be32(XFS_BMAP_MAGIC
):
660 * numrecs and level verification.
662 * We don't know what fork we belong to, so just verify that the level
663 * is less than the maximum of the two. Later checks will be more
666 level
= be16_to_cpu(block
->bb_level
);
667 if (level
> max(mp
->m_bm_maxlevels
[0], mp
->m_bm_maxlevels
[1]))
669 if (be16_to_cpu(block
->bb_numrecs
) > mp
->m_bmap_dmxr
[level
!= 0])
672 /* sibling pointer verification */
673 if (!block
->bb_u
.l
.bb_leftsib
||
674 (block
->bb_u
.l
.bb_leftsib
!= cpu_to_be64(NULLFSBLOCK
) &&
675 !XFS_FSB_SANITY_CHECK(mp
, be64_to_cpu(block
->bb_u
.l
.bb_leftsib
))))
677 if (!block
->bb_u
.l
.bb_rightsib
||
678 (block
->bb_u
.l
.bb_rightsib
!= cpu_to_be64(NULLFSBLOCK
) &&
679 !XFS_FSB_SANITY_CHECK(mp
, be64_to_cpu(block
->bb_u
.l
.bb_rightsib
))))
686 xfs_bmbt_read_verify(
689 if (!xfs_btree_lblock_verify_crc(bp
))
690 xfs_buf_ioerror(bp
, -EFSBADCRC
);
691 else if (!xfs_bmbt_verify(bp
))
692 xfs_buf_ioerror(bp
, -EFSCORRUPTED
);
695 trace_xfs_btree_corrupt(bp
, _RET_IP_
);
696 xfs_verifier_error(bp
);
701 xfs_bmbt_write_verify(
704 if (!xfs_bmbt_verify(bp
)) {
705 trace_xfs_btree_corrupt(bp
, _RET_IP_
);
706 xfs_buf_ioerror(bp
, -EFSCORRUPTED
);
707 xfs_verifier_error(bp
);
710 xfs_btree_lblock_calc_crc(bp
);
713 const struct xfs_buf_ops xfs_bmbt_buf_ops
= {
715 .verify_read
= xfs_bmbt_read_verify
,
716 .verify_write
= xfs_bmbt_write_verify
,
720 #if defined(DEBUG) || defined(XFS_WARN)
722 xfs_bmbt_keys_inorder(
723 struct xfs_btree_cur
*cur
,
724 union xfs_btree_key
*k1
,
725 union xfs_btree_key
*k2
)
727 return be64_to_cpu(k1
->bmbt
.br_startoff
) <
728 be64_to_cpu(k2
->bmbt
.br_startoff
);
732 xfs_bmbt_recs_inorder(
733 struct xfs_btree_cur
*cur
,
734 union xfs_btree_rec
*r1
,
735 union xfs_btree_rec
*r2
)
737 return xfs_bmbt_disk_get_startoff(&r1
->bmbt
) +
738 xfs_bmbt_disk_get_blockcount(&r1
->bmbt
) <=
739 xfs_bmbt_disk_get_startoff(&r2
->bmbt
);
743 static const struct xfs_btree_ops xfs_bmbt_ops
= {
744 .rec_len
= sizeof(xfs_bmbt_rec_t
),
745 .key_len
= sizeof(xfs_bmbt_key_t
),
747 .dup_cursor
= xfs_bmbt_dup_cursor
,
748 .update_cursor
= xfs_bmbt_update_cursor
,
749 .alloc_block
= xfs_bmbt_alloc_block
,
750 .free_block
= xfs_bmbt_free_block
,
751 .get_maxrecs
= xfs_bmbt_get_maxrecs
,
752 .get_minrecs
= xfs_bmbt_get_minrecs
,
753 .get_dmaxrecs
= xfs_bmbt_get_dmaxrecs
,
754 .init_key_from_rec
= xfs_bmbt_init_key_from_rec
,
755 .init_rec_from_cur
= xfs_bmbt_init_rec_from_cur
,
756 .init_ptr_from_cur
= xfs_bmbt_init_ptr_from_cur
,
757 .key_diff
= xfs_bmbt_key_diff
,
758 .buf_ops
= &xfs_bmbt_buf_ops
,
759 #if defined(DEBUG) || defined(XFS_WARN)
760 .keys_inorder
= xfs_bmbt_keys_inorder
,
761 .recs_inorder
= xfs_bmbt_recs_inorder
,
764 .get_leaf_keys
= xfs_btree_get_leaf_keys
,
765 .get_node_keys
= xfs_btree_get_node_keys
,
766 .update_keys
= xfs_btree_update_keys
,
770 * Allocate a new bmap btree cursor.
772 struct xfs_btree_cur
* /* new bmap btree cursor */
773 xfs_bmbt_init_cursor(
774 struct xfs_mount
*mp
, /* file system mount point */
775 struct xfs_trans
*tp
, /* transaction pointer */
776 struct xfs_inode
*ip
, /* inode owning the btree */
777 int whichfork
) /* data or attr fork */
779 struct xfs_ifork
*ifp
= XFS_IFORK_PTR(ip
, whichfork
);
780 struct xfs_btree_cur
*cur
;
782 cur
= kmem_zone_zalloc(xfs_btree_cur_zone
, KM_SLEEP
);
786 cur
->bc_nlevels
= be16_to_cpu(ifp
->if_broot
->bb_level
) + 1;
787 cur
->bc_btnum
= XFS_BTNUM_BMAP
;
788 cur
->bc_blocklog
= mp
->m_sb
.sb_blocklog
;
790 cur
->bc_ops
= &xfs_bmbt_ops
;
791 cur
->bc_flags
= XFS_BTREE_LONG_PTRS
| XFS_BTREE_ROOT_IN_INODE
;
792 if (xfs_sb_version_hascrc(&mp
->m_sb
))
793 cur
->bc_flags
|= XFS_BTREE_CRC_BLOCKS
;
795 cur
->bc_private
.b
.forksize
= XFS_IFORK_SIZE(ip
, whichfork
);
796 cur
->bc_private
.b
.ip
= ip
;
797 cur
->bc_private
.b
.firstblock
= NULLFSBLOCK
;
798 cur
->bc_private
.b
.dfops
= NULL
;
799 cur
->bc_private
.b
.allocated
= 0;
800 cur
->bc_private
.b
.flags
= 0;
801 cur
->bc_private
.b
.whichfork
= whichfork
;
807 * Calculate number of records in a bmap btree block.
811 struct xfs_mount
*mp
,
815 blocklen
-= XFS_BMBT_BLOCK_LEN(mp
);
818 return blocklen
/ sizeof(xfs_bmbt_rec_t
);
819 return blocklen
/ (sizeof(xfs_bmbt_key_t
) + sizeof(xfs_bmbt_ptr_t
));
823 * Calculate number of records in a bmap btree inode root.
830 blocklen
-= sizeof(xfs_bmdr_block_t
);
833 return blocklen
/ sizeof(xfs_bmdr_rec_t
);
834 return blocklen
/ (sizeof(xfs_bmdr_key_t
) + sizeof(xfs_bmdr_ptr_t
));
838 * Change the owner of a btree format fork fo the inode passed in. Change it to
839 * the owner of that is passed in so that we can change owners before or after
840 * we switch forks between inodes. The operation that the caller is doing will
841 * determine whether is needs to change owner before or after the switch.
843 * For demand paged transactional modification, the fork switch should be done
844 * after reading in all the blocks, modifying them and pinning them in the
845 * transaction. For modification when the buffers are already pinned in memory,
846 * the fork switch can be done before changing the owner as we won't need to
847 * validate the owner until the btree buffers are unpinned and writes can occur
850 * For recovery based ownership change, there is no transactional context and
851 * so a buffer list must be supplied so that we can record the buffers that we
852 * modified for the caller to issue IO on.
855 xfs_bmbt_change_owner(
856 struct xfs_trans
*tp
,
857 struct xfs_inode
*ip
,
860 struct list_head
*buffer_list
)
862 struct xfs_btree_cur
*cur
;
865 ASSERT(tp
|| buffer_list
);
866 ASSERT(!(tp
&& buffer_list
));
867 if (whichfork
== XFS_DATA_FORK
)
868 ASSERT(ip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
);
870 ASSERT(ip
->i_d
.di_aformat
== XFS_DINODE_FMT_BTREE
);
872 cur
= xfs_bmbt_init_cursor(ip
->i_mount
, tp
, ip
, whichfork
);
876 error
= xfs_btree_change_owner(cur
, new_owner
, buffer_list
);
877 xfs_btree_del_cursor(cur
, error
? XFS_BTREE_ERROR
: XFS_BTREE_NOERROR
);