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"
37 * Determine the extent state.
46 ASSERT(blks
!= 0); /* saved for DMIG */
47 return XFS_EXT_UNWRITTEN
;
53 * Convert on-disk form of btree root to in-memory form.
58 xfs_bmdr_block_t
*dblock
,
60 struct xfs_btree_block
*rblock
,
63 struct xfs_mount
*mp
= ip
->i_mount
;
70 if (xfs_sb_version_hascrc(&mp
->m_sb
))
71 xfs_btree_init_block_int(mp
, rblock
, XFS_BUF_DADDR_NULL
,
72 XFS_BMAP_CRC_MAGIC
, 0, 0, ip
->i_ino
,
73 XFS_BTREE_LONG_PTRS
| XFS_BTREE_CRC_BLOCKS
);
75 xfs_btree_init_block_int(mp
, rblock
, XFS_BUF_DADDR_NULL
,
76 XFS_BMAP_MAGIC
, 0, 0, ip
->i_ino
,
79 rblock
->bb_level
= dblock
->bb_level
;
80 ASSERT(be16_to_cpu(rblock
->bb_level
) > 0);
81 rblock
->bb_numrecs
= dblock
->bb_numrecs
;
82 dmxr
= xfs_bmdr_maxrecs(dblocklen
, 0);
83 fkp
= XFS_BMDR_KEY_ADDR(dblock
, 1);
84 tkp
= XFS_BMBT_KEY_ADDR(mp
, rblock
, 1);
85 fpp
= XFS_BMDR_PTR_ADDR(dblock
, 1, dmxr
);
86 tpp
= XFS_BMAP_BROOT_PTR_ADDR(mp
, rblock
, 1, rblocklen
);
87 dmxr
= be16_to_cpu(dblock
->bb_numrecs
);
88 memcpy(tkp
, fkp
, sizeof(*fkp
) * dmxr
);
89 memcpy(tpp
, fpp
, sizeof(*fpp
) * dmxr
);
93 * Convert a compressed bmap extent record to an uncompressed form.
94 * This code must be in sync with the routines xfs_bmbt_get_startoff,
95 * xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state.
106 ext_flag
= (int)(l0
>> (64 - BMBT_EXNTFLAG_BITLEN
));
107 s
->br_startoff
= ((xfs_fileoff_t
)l0
&
108 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN
)) >> 9;
109 s
->br_startblock
= (((xfs_fsblock_t
)l0
& xfs_mask64lo(9)) << 43) |
110 (((xfs_fsblock_t
)l1
) >> 21);
111 s
->br_blockcount
= (xfs_filblks_t
)(l1
& xfs_mask64lo(21));
112 /* This is xfs_extent_state() in-line */
114 ASSERT(s
->br_blockcount
!= 0); /* saved for DMIG */
115 st
= XFS_EXT_UNWRITTEN
;
123 xfs_bmbt_rec_host_t
*r
,
126 __xfs_bmbt_get_all(r
->l0
, r
->l1
, s
);
130 * Extract the blockcount field from an in memory bmap extent record.
133 xfs_bmbt_get_blockcount(
134 xfs_bmbt_rec_host_t
*r
)
136 return (xfs_filblks_t
)(r
->l1
& xfs_mask64lo(21));
140 * Extract the startblock field from an in memory bmap extent record.
143 xfs_bmbt_get_startblock(
144 xfs_bmbt_rec_host_t
*r
)
146 return (((xfs_fsblock_t
)r
->l0
& xfs_mask64lo(9)) << 43) |
147 (((xfs_fsblock_t
)r
->l1
) >> 21);
151 * Extract the startoff field from an in memory bmap extent record.
154 xfs_bmbt_get_startoff(
155 xfs_bmbt_rec_host_t
*r
)
157 return ((xfs_fileoff_t
)r
->l0
&
158 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN
)) >> 9;
163 xfs_bmbt_rec_host_t
*r
)
167 ext_flag
= (int)((r
->l0
) >> (64 - BMBT_EXNTFLAG_BITLEN
));
168 return xfs_extent_state(xfs_bmbt_get_blockcount(r
),
173 * Extract the blockcount field from an on disk bmap extent record.
176 xfs_bmbt_disk_get_blockcount(
179 return (xfs_filblks_t
)(be64_to_cpu(r
->l1
) & xfs_mask64lo(21));
183 * Extract the startoff field from a disk format bmap extent record.
186 xfs_bmbt_disk_get_startoff(
189 return ((xfs_fileoff_t
)be64_to_cpu(r
->l0
) &
190 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN
)) >> 9;
195 * Set all the fields in a bmap extent record from the arguments.
199 xfs_bmbt_rec_host_t
*r
,
200 xfs_fileoff_t startoff
,
201 xfs_fsblock_t startblock
,
202 xfs_filblks_t blockcount
,
205 int extent_flag
= (state
== XFS_EXT_NORM
) ? 0 : 1;
207 ASSERT(state
== XFS_EXT_NORM
|| state
== XFS_EXT_UNWRITTEN
);
208 ASSERT((startoff
& xfs_mask64hi(64-BMBT_STARTOFF_BITLEN
)) == 0);
209 ASSERT((blockcount
& xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN
)) == 0);
211 ASSERT((startblock
& xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN
)) == 0);
213 r
->l0
= ((xfs_bmbt_rec_base_t
)extent_flag
<< 63) |
214 ((xfs_bmbt_rec_base_t
)startoff
<< 9) |
215 ((xfs_bmbt_rec_base_t
)startblock
>> 43);
216 r
->l1
= ((xfs_bmbt_rec_base_t
)startblock
<< 21) |
217 ((xfs_bmbt_rec_base_t
)blockcount
&
218 (xfs_bmbt_rec_base_t
)xfs_mask64lo(21));
222 * Set all the fields in a bmap extent record from the uncompressed form.
226 xfs_bmbt_rec_host_t
*r
,
229 xfs_bmbt_set_allf(r
, s
->br_startoff
, s
->br_startblock
,
230 s
->br_blockcount
, s
->br_state
);
235 * Set all the fields in a disk format bmap extent record from the arguments.
238 xfs_bmbt_disk_set_allf(
240 xfs_fileoff_t startoff
,
241 xfs_fsblock_t startblock
,
242 xfs_filblks_t blockcount
,
245 int extent_flag
= (state
== XFS_EXT_NORM
) ? 0 : 1;
247 ASSERT(state
== XFS_EXT_NORM
|| state
== XFS_EXT_UNWRITTEN
);
248 ASSERT((startoff
& xfs_mask64hi(64-BMBT_STARTOFF_BITLEN
)) == 0);
249 ASSERT((blockcount
& xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN
)) == 0);
250 ASSERT((startblock
& xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN
)) == 0);
253 ((xfs_bmbt_rec_base_t
)extent_flag
<< 63) |
254 ((xfs_bmbt_rec_base_t
)startoff
<< 9) |
255 ((xfs_bmbt_rec_base_t
)startblock
>> 43));
257 ((xfs_bmbt_rec_base_t
)startblock
<< 21) |
258 ((xfs_bmbt_rec_base_t
)blockcount
&
259 (xfs_bmbt_rec_base_t
)xfs_mask64lo(21)));
263 * Set all the fields in a bmap extent record from the uncompressed form.
266 xfs_bmbt_disk_set_all(
270 xfs_bmbt_disk_set_allf(r
, s
->br_startoff
, s
->br_startblock
,
271 s
->br_blockcount
, s
->br_state
);
275 * Set the blockcount field in a bmap extent record.
278 xfs_bmbt_set_blockcount(
279 xfs_bmbt_rec_host_t
*r
,
282 ASSERT((v
& xfs_mask64hi(43)) == 0);
283 r
->l1
= (r
->l1
& (xfs_bmbt_rec_base_t
)xfs_mask64hi(43)) |
284 (xfs_bmbt_rec_base_t
)(v
& xfs_mask64lo(21));
288 * Set the startblock field in a bmap extent record.
291 xfs_bmbt_set_startblock(
292 xfs_bmbt_rec_host_t
*r
,
295 ASSERT((v
& xfs_mask64hi(12)) == 0);
296 r
->l0
= (r
->l0
& (xfs_bmbt_rec_base_t
)xfs_mask64hi(55)) |
297 (xfs_bmbt_rec_base_t
)(v
>> 43);
298 r
->l1
= (r
->l1
& (xfs_bmbt_rec_base_t
)xfs_mask64lo(21)) |
299 (xfs_bmbt_rec_base_t
)(v
<< 21);
303 * Set the startoff field in a bmap extent record.
306 xfs_bmbt_set_startoff(
307 xfs_bmbt_rec_host_t
*r
,
310 ASSERT((v
& xfs_mask64hi(9)) == 0);
311 r
->l0
= (r
->l0
& (xfs_bmbt_rec_base_t
) xfs_mask64hi(1)) |
312 ((xfs_bmbt_rec_base_t
)v
<< 9) |
313 (r
->l0
& (xfs_bmbt_rec_base_t
)xfs_mask64lo(9));
317 * Set the extent state field in a bmap extent record.
321 xfs_bmbt_rec_host_t
*r
,
324 ASSERT(v
== XFS_EXT_NORM
|| v
== XFS_EXT_UNWRITTEN
);
325 if (v
== XFS_EXT_NORM
)
326 r
->l0
&= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN
);
328 r
->l0
|= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN
);
332 * Convert in-memory form of btree root to on-disk form.
336 struct xfs_mount
*mp
,
337 struct xfs_btree_block
*rblock
,
339 xfs_bmdr_block_t
*dblock
,
348 if (xfs_sb_version_hascrc(&mp
->m_sb
)) {
349 ASSERT(rblock
->bb_magic
== cpu_to_be32(XFS_BMAP_CRC_MAGIC
));
350 ASSERT(uuid_equal(&rblock
->bb_u
.l
.bb_uuid
,
351 &mp
->m_sb
.sb_meta_uuid
));
352 ASSERT(rblock
->bb_u
.l
.bb_blkno
==
353 cpu_to_be64(XFS_BUF_DADDR_NULL
));
355 ASSERT(rblock
->bb_magic
== cpu_to_be32(XFS_BMAP_MAGIC
));
356 ASSERT(rblock
->bb_u
.l
.bb_leftsib
== cpu_to_be64(NULLFSBLOCK
));
357 ASSERT(rblock
->bb_u
.l
.bb_rightsib
== cpu_to_be64(NULLFSBLOCK
));
358 ASSERT(rblock
->bb_level
!= 0);
359 dblock
->bb_level
= rblock
->bb_level
;
360 dblock
->bb_numrecs
= rblock
->bb_numrecs
;
361 dmxr
= xfs_bmdr_maxrecs(dblocklen
, 0);
362 fkp
= XFS_BMBT_KEY_ADDR(mp
, rblock
, 1);
363 tkp
= XFS_BMDR_KEY_ADDR(dblock
, 1);
364 fpp
= XFS_BMAP_BROOT_PTR_ADDR(mp
, rblock
, 1, rblocklen
);
365 tpp
= XFS_BMDR_PTR_ADDR(dblock
, 1, dmxr
);
366 dmxr
= be16_to_cpu(dblock
->bb_numrecs
);
367 memcpy(tkp
, fkp
, sizeof(*fkp
) * dmxr
);
368 memcpy(tpp
, fpp
, sizeof(*fpp
) * dmxr
);
372 * Check extent records, which have just been read, for
373 * any bit in the extent flag field. ASSERT on debug
374 * kernels, as this condition should not occur.
375 * Return an error condition (1) if any flags found,
376 * otherwise return 0.
380 xfs_check_nostate_extents(
385 for (; num
> 0; num
--, idx
++) {
386 xfs_bmbt_rec_host_t
*ep
= xfs_iext_get_ext(ifp
, idx
);
388 (64 - BMBT_EXNTFLAG_BITLEN
)) != 0) {
397 STATIC
struct xfs_btree_cur
*
399 struct xfs_btree_cur
*cur
)
401 struct xfs_btree_cur
*new;
403 new = xfs_bmbt_init_cursor(cur
->bc_mp
, cur
->bc_tp
,
404 cur
->bc_private
.b
.ip
, cur
->bc_private
.b
.whichfork
);
407 * Copy the firstblock, flist, and flags values,
408 * since init cursor doesn't get them.
410 new->bc_private
.b
.firstblock
= cur
->bc_private
.b
.firstblock
;
411 new->bc_private
.b
.flist
= cur
->bc_private
.b
.flist
;
412 new->bc_private
.b
.flags
= cur
->bc_private
.b
.flags
;
418 xfs_bmbt_update_cursor(
419 struct xfs_btree_cur
*src
,
420 struct xfs_btree_cur
*dst
)
422 ASSERT((dst
->bc_private
.b
.firstblock
!= NULLFSBLOCK
) ||
423 (dst
->bc_private
.b
.ip
->i_d
.di_flags
& XFS_DIFLAG_REALTIME
));
424 ASSERT(dst
->bc_private
.b
.flist
== src
->bc_private
.b
.flist
);
426 dst
->bc_private
.b
.allocated
+= src
->bc_private
.b
.allocated
;
427 dst
->bc_private
.b
.firstblock
= src
->bc_private
.b
.firstblock
;
429 src
->bc_private
.b
.allocated
= 0;
433 xfs_bmbt_alloc_block(
434 struct xfs_btree_cur
*cur
,
435 union xfs_btree_ptr
*start
,
436 union xfs_btree_ptr
*new,
439 xfs_alloc_arg_t args
; /* block allocation args */
440 int error
; /* error return value */
442 memset(&args
, 0, sizeof(args
));
443 args
.tp
= cur
->bc_tp
;
444 args
.mp
= cur
->bc_mp
;
445 args
.fsbno
= cur
->bc_private
.b
.firstblock
;
446 args
.firstblock
= args
.fsbno
;
448 if (args
.fsbno
== NULLFSBLOCK
) {
449 args
.fsbno
= be64_to_cpu(start
->l
);
450 args
.type
= XFS_ALLOCTYPE_START_BNO
;
452 * Make sure there is sufficient room left in the AG to
453 * complete a full tree split for an extent insert. If
454 * we are converting the middle part of an extent then
455 * we may need space for two tree splits.
457 * We are relying on the caller to make the correct block
458 * reservation for this operation to succeed. If the
459 * reservation amount is insufficient then we may fail a
460 * block allocation here and corrupt the filesystem.
462 args
.minleft
= args
.tp
->t_blk_res
;
463 } else if (cur
->bc_private
.b
.flist
->dop_low
) {
464 args
.type
= XFS_ALLOCTYPE_START_BNO
;
466 args
.type
= XFS_ALLOCTYPE_NEAR_BNO
;
469 args
.minlen
= args
.maxlen
= args
.prod
= 1;
470 args
.wasdel
= cur
->bc_private
.b
.flags
& XFS_BTCUR_BPRV_WASDEL
;
471 if (!args
.wasdel
&& args
.tp
->t_blk_res
== 0) {
475 error
= xfs_alloc_vextent(&args
);
479 if (args
.fsbno
== NULLFSBLOCK
&& args
.minleft
) {
481 * Could not find an AG with enough free space to satisfy
482 * a full btree split. Try again without minleft and if
483 * successful activate the lowspace algorithm.
486 args
.type
= XFS_ALLOCTYPE_FIRST_AG
;
488 error
= xfs_alloc_vextent(&args
);
491 cur
->bc_private
.b
.flist
->dop_low
= true;
493 if (args
.fsbno
== NULLFSBLOCK
) {
494 XFS_BTREE_TRACE_CURSOR(cur
, XBT_EXIT
);
498 ASSERT(args
.len
== 1);
499 cur
->bc_private
.b
.firstblock
= args
.fsbno
;
500 cur
->bc_private
.b
.allocated
++;
501 cur
->bc_private
.b
.ip
->i_d
.di_nblocks
++;
502 xfs_trans_log_inode(args
.tp
, cur
->bc_private
.b
.ip
, XFS_ILOG_CORE
);
503 xfs_trans_mod_dquot_byino(args
.tp
, cur
->bc_private
.b
.ip
,
504 XFS_TRANS_DQ_BCOUNT
, 1L);
506 new->l
= cpu_to_be64(args
.fsbno
);
508 XFS_BTREE_TRACE_CURSOR(cur
, XBT_EXIT
);
513 XFS_BTREE_TRACE_CURSOR(cur
, XBT_ERROR
);
519 struct xfs_btree_cur
*cur
,
522 struct xfs_mount
*mp
= cur
->bc_mp
;
523 struct xfs_inode
*ip
= cur
->bc_private
.b
.ip
;
524 struct xfs_trans
*tp
= cur
->bc_tp
;
525 xfs_fsblock_t fsbno
= XFS_DADDR_TO_FSB(mp
, XFS_BUF_ADDR(bp
));
527 xfs_bmap_add_free(mp
, cur
->bc_private
.b
.flist
, fsbno
, 1);
528 ip
->i_d
.di_nblocks
--;
530 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
531 xfs_trans_mod_dquot_byino(tp
, ip
, XFS_TRANS_DQ_BCOUNT
, -1L);
536 xfs_bmbt_get_minrecs(
537 struct xfs_btree_cur
*cur
,
540 if (level
== cur
->bc_nlevels
- 1) {
541 struct xfs_ifork
*ifp
;
543 ifp
= XFS_IFORK_PTR(cur
->bc_private
.b
.ip
,
544 cur
->bc_private
.b
.whichfork
);
546 return xfs_bmbt_maxrecs(cur
->bc_mp
,
547 ifp
->if_broot_bytes
, level
== 0) / 2;
550 return cur
->bc_mp
->m_bmap_dmnr
[level
!= 0];
554 xfs_bmbt_get_maxrecs(
555 struct xfs_btree_cur
*cur
,
558 if (level
== cur
->bc_nlevels
- 1) {
559 struct xfs_ifork
*ifp
;
561 ifp
= XFS_IFORK_PTR(cur
->bc_private
.b
.ip
,
562 cur
->bc_private
.b
.whichfork
);
564 return xfs_bmbt_maxrecs(cur
->bc_mp
,
565 ifp
->if_broot_bytes
, level
== 0);
568 return cur
->bc_mp
->m_bmap_dmxr
[level
!= 0];
573 * Get the maximum records we could store in the on-disk format.
575 * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
576 * for the root node this checks the available space in the dinode fork
577 * so that we can resize the in-memory buffer to match it. After a
578 * resize to the maximum size this function returns the same value
579 * as xfs_bmbt_get_maxrecs for the root node, too.
582 xfs_bmbt_get_dmaxrecs(
583 struct xfs_btree_cur
*cur
,
586 if (level
!= cur
->bc_nlevels
- 1)
587 return cur
->bc_mp
->m_bmap_dmxr
[level
!= 0];
588 return xfs_bmdr_maxrecs(cur
->bc_private
.b
.forksize
, level
== 0);
592 xfs_bmbt_init_key_from_rec(
593 union xfs_btree_key
*key
,
594 union xfs_btree_rec
*rec
)
596 key
->bmbt
.br_startoff
=
597 cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec
->bmbt
));
601 xfs_bmbt_init_rec_from_cur(
602 struct xfs_btree_cur
*cur
,
603 union xfs_btree_rec
*rec
)
605 xfs_bmbt_disk_set_all(&rec
->bmbt
, &cur
->bc_rec
.b
);
609 xfs_bmbt_init_ptr_from_cur(
610 struct xfs_btree_cur
*cur
,
611 union xfs_btree_ptr
*ptr
)
618 struct xfs_btree_cur
*cur
,
619 union xfs_btree_key
*key
)
621 return (__int64_t
)be64_to_cpu(key
->bmbt
.br_startoff
) -
622 cur
->bc_rec
.b
.br_startoff
;
629 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
630 struct xfs_btree_block
*block
= XFS_BUF_TO_BLOCK(bp
);
633 switch (block
->bb_magic
) {
634 case cpu_to_be32(XFS_BMAP_CRC_MAGIC
):
635 if (!xfs_sb_version_hascrc(&mp
->m_sb
))
637 if (!uuid_equal(&block
->bb_u
.l
.bb_uuid
, &mp
->m_sb
.sb_meta_uuid
))
639 if (be64_to_cpu(block
->bb_u
.l
.bb_blkno
) != bp
->b_bn
)
642 * XXX: need a better way of verifying the owner here. Right now
643 * just make sure there has been one set.
645 if (be64_to_cpu(block
->bb_u
.l
.bb_owner
) == 0)
648 case cpu_to_be32(XFS_BMAP_MAGIC
):
655 * numrecs and level verification.
657 * We don't know what fork we belong to, so just verify that the level
658 * is less than the maximum of the two. Later checks will be more
661 level
= be16_to_cpu(block
->bb_level
);
662 if (level
> max(mp
->m_bm_maxlevels
[0], mp
->m_bm_maxlevels
[1]))
664 if (be16_to_cpu(block
->bb_numrecs
) > mp
->m_bmap_dmxr
[level
!= 0])
667 /* sibling pointer verification */
668 if (!block
->bb_u
.l
.bb_leftsib
||
669 (block
->bb_u
.l
.bb_leftsib
!= cpu_to_be64(NULLFSBLOCK
) &&
670 !XFS_FSB_SANITY_CHECK(mp
, be64_to_cpu(block
->bb_u
.l
.bb_leftsib
))))
672 if (!block
->bb_u
.l
.bb_rightsib
||
673 (block
->bb_u
.l
.bb_rightsib
!= cpu_to_be64(NULLFSBLOCK
) &&
674 !XFS_FSB_SANITY_CHECK(mp
, be64_to_cpu(block
->bb_u
.l
.bb_rightsib
))))
681 xfs_bmbt_read_verify(
684 if (!xfs_btree_lblock_verify_crc(bp
))
685 xfs_buf_ioerror(bp
, -EFSBADCRC
);
686 else if (!xfs_bmbt_verify(bp
))
687 xfs_buf_ioerror(bp
, -EFSCORRUPTED
);
690 trace_xfs_btree_corrupt(bp
, _RET_IP_
);
691 xfs_verifier_error(bp
);
696 xfs_bmbt_write_verify(
699 if (!xfs_bmbt_verify(bp
)) {
700 trace_xfs_btree_corrupt(bp
, _RET_IP_
);
701 xfs_buf_ioerror(bp
, -EFSCORRUPTED
);
702 xfs_verifier_error(bp
);
705 xfs_btree_lblock_calc_crc(bp
);
708 const struct xfs_buf_ops xfs_bmbt_buf_ops
= {
710 .verify_read
= xfs_bmbt_read_verify
,
711 .verify_write
= xfs_bmbt_write_verify
,
715 #if defined(DEBUG) || defined(XFS_WARN)
717 xfs_bmbt_keys_inorder(
718 struct xfs_btree_cur
*cur
,
719 union xfs_btree_key
*k1
,
720 union xfs_btree_key
*k2
)
722 return be64_to_cpu(k1
->bmbt
.br_startoff
) <
723 be64_to_cpu(k2
->bmbt
.br_startoff
);
727 xfs_bmbt_recs_inorder(
728 struct xfs_btree_cur
*cur
,
729 union xfs_btree_rec
*r1
,
730 union xfs_btree_rec
*r2
)
732 return xfs_bmbt_disk_get_startoff(&r1
->bmbt
) +
733 xfs_bmbt_disk_get_blockcount(&r1
->bmbt
) <=
734 xfs_bmbt_disk_get_startoff(&r2
->bmbt
);
738 static const struct xfs_btree_ops xfs_bmbt_ops
= {
739 .rec_len
= sizeof(xfs_bmbt_rec_t
),
740 .key_len
= sizeof(xfs_bmbt_key_t
),
742 .dup_cursor
= xfs_bmbt_dup_cursor
,
743 .update_cursor
= xfs_bmbt_update_cursor
,
744 .alloc_block
= xfs_bmbt_alloc_block
,
745 .free_block
= xfs_bmbt_free_block
,
746 .get_maxrecs
= xfs_bmbt_get_maxrecs
,
747 .get_minrecs
= xfs_bmbt_get_minrecs
,
748 .get_dmaxrecs
= xfs_bmbt_get_dmaxrecs
,
749 .init_key_from_rec
= xfs_bmbt_init_key_from_rec
,
750 .init_rec_from_cur
= xfs_bmbt_init_rec_from_cur
,
751 .init_ptr_from_cur
= xfs_bmbt_init_ptr_from_cur
,
752 .key_diff
= xfs_bmbt_key_diff
,
753 .buf_ops
= &xfs_bmbt_buf_ops
,
754 #if defined(DEBUG) || defined(XFS_WARN)
755 .keys_inorder
= xfs_bmbt_keys_inorder
,
756 .recs_inorder
= xfs_bmbt_recs_inorder
,
759 .get_leaf_keys
= xfs_btree_get_leaf_keys
,
760 .get_node_keys
= xfs_btree_get_node_keys
,
761 .update_keys
= xfs_btree_update_keys
,
765 * Allocate a new bmap btree cursor.
767 struct xfs_btree_cur
* /* new bmap btree cursor */
768 xfs_bmbt_init_cursor(
769 struct xfs_mount
*mp
, /* file system mount point */
770 struct xfs_trans
*tp
, /* transaction pointer */
771 struct xfs_inode
*ip
, /* inode owning the btree */
772 int whichfork
) /* data or attr fork */
774 struct xfs_ifork
*ifp
= XFS_IFORK_PTR(ip
, whichfork
);
775 struct xfs_btree_cur
*cur
;
777 cur
= kmem_zone_zalloc(xfs_btree_cur_zone
, KM_SLEEP
);
781 cur
->bc_nlevels
= be16_to_cpu(ifp
->if_broot
->bb_level
) + 1;
782 cur
->bc_btnum
= XFS_BTNUM_BMAP
;
783 cur
->bc_blocklog
= mp
->m_sb
.sb_blocklog
;
785 cur
->bc_ops
= &xfs_bmbt_ops
;
786 cur
->bc_flags
= XFS_BTREE_LONG_PTRS
| XFS_BTREE_ROOT_IN_INODE
;
787 if (xfs_sb_version_hascrc(&mp
->m_sb
))
788 cur
->bc_flags
|= XFS_BTREE_CRC_BLOCKS
;
790 cur
->bc_private
.b
.forksize
= XFS_IFORK_SIZE(ip
, whichfork
);
791 cur
->bc_private
.b
.ip
= ip
;
792 cur
->bc_private
.b
.firstblock
= NULLFSBLOCK
;
793 cur
->bc_private
.b
.flist
= NULL
;
794 cur
->bc_private
.b
.allocated
= 0;
795 cur
->bc_private
.b
.flags
= 0;
796 cur
->bc_private
.b
.whichfork
= whichfork
;
802 * Calculate number of records in a bmap btree block.
806 struct xfs_mount
*mp
,
810 blocklen
-= XFS_BMBT_BLOCK_LEN(mp
);
813 return blocklen
/ sizeof(xfs_bmbt_rec_t
);
814 return blocklen
/ (sizeof(xfs_bmbt_key_t
) + sizeof(xfs_bmbt_ptr_t
));
818 * Calculate number of records in a bmap btree inode root.
825 blocklen
-= sizeof(xfs_bmdr_block_t
);
828 return blocklen
/ sizeof(xfs_bmdr_rec_t
);
829 return blocklen
/ (sizeof(xfs_bmdr_key_t
) + sizeof(xfs_bmdr_ptr_t
));
833 * Change the owner of a btree format fork fo the inode passed in. Change it to
834 * the owner of that is passed in so that we can change owners before or after
835 * we switch forks between inodes. The operation that the caller is doing will
836 * determine whether is needs to change owner before or after the switch.
838 * For demand paged transactional modification, the fork switch should be done
839 * after reading in all the blocks, modifying them and pinning them in the
840 * transaction. For modification when the buffers are already pinned in memory,
841 * the fork switch can be done before changing the owner as we won't need to
842 * validate the owner until the btree buffers are unpinned and writes can occur
845 * For recovery based ownership change, there is no transactional context and
846 * so a buffer list must be supplied so that we can record the buffers that we
847 * modified for the caller to issue IO on.
850 xfs_bmbt_change_owner(
851 struct xfs_trans
*tp
,
852 struct xfs_inode
*ip
,
855 struct list_head
*buffer_list
)
857 struct xfs_btree_cur
*cur
;
860 ASSERT(tp
|| buffer_list
);
861 ASSERT(!(tp
&& buffer_list
));
862 if (whichfork
== XFS_DATA_FORK
)
863 ASSERT(ip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
);
865 ASSERT(ip
->i_d
.di_aformat
== XFS_DINODE_FMT_BTREE
);
867 cur
= xfs_bmbt_init_cursor(ip
->i_mount
, tp
, ip
, whichfork
);
871 error
= xfs_btree_change_owner(cur
, new_owner
, buffer_list
);
872 xfs_btree_del_cursor(cur
, error
? XFS_BTREE_ERROR
: XFS_BTREE_NOERROR
);