2 * Copyright (c) 2000-2005 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
20 #include "xfs_shared.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
26 #include "xfs_mount.h"
27 #include "xfs_da_format.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_inode.h"
30 #include "xfs_trans.h"
31 #include "xfs_inode_item.h"
32 #include "xfs_error.h"
33 #include "xfs_btree.h"
34 #include "xfs_alloc_btree.h"
35 #include "xfs_alloc.h"
36 #include "xfs_ialloc.h"
37 #include "xfs_fsops.h"
38 #include "xfs_itable.h"
39 #include "xfs_trans_space.h"
40 #include "xfs_rtalloc.h"
41 #include "xfs_trace.h"
43 #include "xfs_dinode.h"
44 #include "xfs_filestream.h"
47 * File system operations
57 memset(geo
, 0, sizeof(*geo
));
59 geo
->blocksize
= mp
->m_sb
.sb_blocksize
;
60 geo
->rtextsize
= mp
->m_sb
.sb_rextsize
;
61 geo
->agblocks
= mp
->m_sb
.sb_agblocks
;
62 geo
->agcount
= mp
->m_sb
.sb_agcount
;
63 geo
->logblocks
= mp
->m_sb
.sb_logblocks
;
64 geo
->sectsize
= mp
->m_sb
.sb_sectsize
;
65 geo
->inodesize
= mp
->m_sb
.sb_inodesize
;
66 geo
->imaxpct
= mp
->m_sb
.sb_imax_pct
;
67 geo
->datablocks
= mp
->m_sb
.sb_dblocks
;
68 geo
->rtblocks
= mp
->m_sb
.sb_rblocks
;
69 geo
->rtextents
= mp
->m_sb
.sb_rextents
;
70 geo
->logstart
= mp
->m_sb
.sb_logstart
;
71 ASSERT(sizeof(geo
->uuid
)==sizeof(mp
->m_sb
.sb_uuid
));
72 memcpy(geo
->uuid
, &mp
->m_sb
.sb_uuid
, sizeof(mp
->m_sb
.sb_uuid
));
73 if (new_version
>= 2) {
74 geo
->sunit
= mp
->m_sb
.sb_unit
;
75 geo
->swidth
= mp
->m_sb
.sb_width
;
77 if (new_version
>= 3) {
78 geo
->version
= XFS_FSOP_GEOM_VERSION
;
79 geo
->flags
= XFS_FSOP_GEOM_FLAGS_NLINK
|
80 XFS_FSOP_GEOM_FLAGS_DIRV2
|
81 (xfs_sb_version_hasattr(&mp
->m_sb
) ?
82 XFS_FSOP_GEOM_FLAGS_ATTR
: 0) |
83 (xfs_sb_version_hasquota(&mp
->m_sb
) ?
84 XFS_FSOP_GEOM_FLAGS_QUOTA
: 0) |
85 (xfs_sb_version_hasalign(&mp
->m_sb
) ?
86 XFS_FSOP_GEOM_FLAGS_IALIGN
: 0) |
87 (xfs_sb_version_hasdalign(&mp
->m_sb
) ?
88 XFS_FSOP_GEOM_FLAGS_DALIGN
: 0) |
89 (xfs_sb_version_hasextflgbit(&mp
->m_sb
) ?
90 XFS_FSOP_GEOM_FLAGS_EXTFLG
: 0) |
91 (xfs_sb_version_hassector(&mp
->m_sb
) ?
92 XFS_FSOP_GEOM_FLAGS_SECTOR
: 0) |
93 (xfs_sb_version_hasasciici(&mp
->m_sb
) ?
94 XFS_FSOP_GEOM_FLAGS_DIRV2CI
: 0) |
95 (xfs_sb_version_haslazysbcount(&mp
->m_sb
) ?
96 XFS_FSOP_GEOM_FLAGS_LAZYSB
: 0) |
97 (xfs_sb_version_hasattr2(&mp
->m_sb
) ?
98 XFS_FSOP_GEOM_FLAGS_ATTR2
: 0) |
99 (xfs_sb_version_hasprojid32bit(&mp
->m_sb
) ?
100 XFS_FSOP_GEOM_FLAGS_PROJID32
: 0) |
101 (xfs_sb_version_hascrc(&mp
->m_sb
) ?
102 XFS_FSOP_GEOM_FLAGS_V5SB
: 0) |
103 (xfs_sb_version_hasftype(&mp
->m_sb
) ?
104 XFS_FSOP_GEOM_FLAGS_FTYPE
: 0) |
105 (xfs_sb_version_hasfinobt(&mp
->m_sb
) ?
106 XFS_FSOP_GEOM_FLAGS_FINOBT
: 0);
107 geo
->logsectsize
= xfs_sb_version_hassector(&mp
->m_sb
) ?
108 mp
->m_sb
.sb_logsectsize
: BBSIZE
;
109 geo
->rtsectsize
= mp
->m_sb
.sb_blocksize
;
110 geo
->dirblocksize
= mp
->m_dir_geo
->blksize
;
112 if (new_version
>= 4) {
114 (xfs_sb_version_haslogv2(&mp
->m_sb
) ?
115 XFS_FSOP_GEOM_FLAGS_LOGV2
: 0);
116 geo
->logsunit
= mp
->m_sb
.sb_logsunit
;
121 static struct xfs_buf
*
122 xfs_growfs_get_hdr_buf(
123 struct xfs_mount
*mp
,
127 const struct xfs_buf_ops
*ops
)
131 bp
= xfs_buf_get_uncached(mp
->m_ddev_targp
, numblks
, flags
);
135 xfs_buf_zero(bp
, 0, BBTOB(bp
->b_length
));
137 bp
->b_maps
[0].bm_bn
= blkno
;
144 xfs_growfs_data_private(
145 xfs_mount_t
*mp
, /* mount point for filesystem */
146 xfs_growfs_data_t
*in
) /* growfs data input struct */
149 struct xfs_agfl
*agfl
;
153 xfs_extlen_t tmpsize
;
154 xfs_alloc_rec_t
*arec
;
158 int error
, saved_error
= 0;
159 xfs_agnumber_t nagcount
;
160 xfs_agnumber_t nagimax
= 0;
161 xfs_rfsblock_t nb
, nb_mod
;
163 xfs_rfsblock_t nfree
;
164 xfs_agnumber_t oagcount
;
170 if (nb
< mp
->m_sb
.sb_dblocks
|| pct
< 0 || pct
> 100)
172 if ((error
= xfs_sb_validate_fsb_count(&mp
->m_sb
, nb
)))
174 dpct
= pct
- mp
->m_sb
.sb_imax_pct
;
175 error
= xfs_buf_read_uncached(mp
->m_ddev_targp
,
176 XFS_FSB_TO_BB(mp
, nb
) - XFS_FSS_TO_BB(mp
, 1),
177 XFS_FSS_TO_BB(mp
, 1), 0, &bp
, NULL
);
182 new = nb
; /* use new as a temporary here */
183 nb_mod
= do_div(new, mp
->m_sb
.sb_agblocks
);
184 nagcount
= new + (nb_mod
!= 0);
185 if (nb_mod
&& nb_mod
< XFS_MIN_AG_BLOCKS
) {
187 nb
= (xfs_rfsblock_t
)nagcount
* mp
->m_sb
.sb_agblocks
;
188 if (nb
< mp
->m_sb
.sb_dblocks
)
191 new = nb
- mp
->m_sb
.sb_dblocks
;
192 oagcount
= mp
->m_sb
.sb_agcount
;
194 /* allocate the new per-ag structures */
195 if (nagcount
> oagcount
) {
196 error
= xfs_initialize_perag(mp
, nagcount
, &nagimax
);
201 tp
= xfs_trans_alloc(mp
, XFS_TRANS_GROWFS
);
202 tp
->t_flags
|= XFS_TRANS_RESERVE
;
203 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_growdata
,
204 XFS_GROWFS_SPACE_RES(mp
), 0);
206 xfs_trans_cancel(tp
, 0);
211 * Write new AG headers to disk. Non-transactional, but written
212 * synchronously so they are completed prior to the growfs transaction
216 for (agno
= nagcount
- 1; agno
>= oagcount
; agno
--, new -= agsize
) {
220 * AG freespace header block
222 bp
= xfs_growfs_get_hdr_buf(mp
,
223 XFS_AG_DADDR(mp
, agno
, XFS_AGF_DADDR(mp
)),
224 XFS_FSS_TO_BB(mp
, 1), 0,
231 agf
= XFS_BUF_TO_AGF(bp
);
232 agf
->agf_magicnum
= cpu_to_be32(XFS_AGF_MAGIC
);
233 agf
->agf_versionnum
= cpu_to_be32(XFS_AGF_VERSION
);
234 agf
->agf_seqno
= cpu_to_be32(agno
);
235 if (agno
== nagcount
- 1)
238 (agno
* (xfs_rfsblock_t
)mp
->m_sb
.sb_agblocks
);
240 agsize
= mp
->m_sb
.sb_agblocks
;
241 agf
->agf_length
= cpu_to_be32(agsize
);
242 agf
->agf_roots
[XFS_BTNUM_BNOi
] = cpu_to_be32(XFS_BNO_BLOCK(mp
));
243 agf
->agf_roots
[XFS_BTNUM_CNTi
] = cpu_to_be32(XFS_CNT_BLOCK(mp
));
244 agf
->agf_levels
[XFS_BTNUM_BNOi
] = cpu_to_be32(1);
245 agf
->agf_levels
[XFS_BTNUM_CNTi
] = cpu_to_be32(1);
246 agf
->agf_flfirst
= 0;
247 agf
->agf_fllast
= cpu_to_be32(XFS_AGFL_SIZE(mp
) - 1);
248 agf
->agf_flcount
= 0;
249 tmpsize
= agsize
- XFS_PREALLOC_BLOCKS(mp
);
250 agf
->agf_freeblks
= cpu_to_be32(tmpsize
);
251 agf
->agf_longest
= cpu_to_be32(tmpsize
);
252 if (xfs_sb_version_hascrc(&mp
->m_sb
))
253 uuid_copy(&agf
->agf_uuid
, &mp
->m_sb
.sb_uuid
);
255 error
= xfs_bwrite(bp
);
261 * AG freelist header block
263 bp
= xfs_growfs_get_hdr_buf(mp
,
264 XFS_AG_DADDR(mp
, agno
, XFS_AGFL_DADDR(mp
)),
265 XFS_FSS_TO_BB(mp
, 1), 0,
272 agfl
= XFS_BUF_TO_AGFL(bp
);
273 if (xfs_sb_version_hascrc(&mp
->m_sb
)) {
274 agfl
->agfl_magicnum
= cpu_to_be32(XFS_AGFL_MAGIC
);
275 agfl
->agfl_seqno
= cpu_to_be32(agno
);
276 uuid_copy(&agfl
->agfl_uuid
, &mp
->m_sb
.sb_uuid
);
279 agfl_bno
= XFS_BUF_TO_AGFL_BNO(mp
, bp
);
280 for (bucket
= 0; bucket
< XFS_AGFL_SIZE(mp
); bucket
++)
281 agfl_bno
[bucket
] = cpu_to_be32(NULLAGBLOCK
);
283 error
= xfs_bwrite(bp
);
289 * AG inode header block
291 bp
= xfs_growfs_get_hdr_buf(mp
,
292 XFS_AG_DADDR(mp
, agno
, XFS_AGI_DADDR(mp
)),
293 XFS_FSS_TO_BB(mp
, 1), 0,
300 agi
= XFS_BUF_TO_AGI(bp
);
301 agi
->agi_magicnum
= cpu_to_be32(XFS_AGI_MAGIC
);
302 agi
->agi_versionnum
= cpu_to_be32(XFS_AGI_VERSION
);
303 agi
->agi_seqno
= cpu_to_be32(agno
);
304 agi
->agi_length
= cpu_to_be32(agsize
);
306 agi
->agi_root
= cpu_to_be32(XFS_IBT_BLOCK(mp
));
307 agi
->agi_level
= cpu_to_be32(1);
308 agi
->agi_freecount
= 0;
309 agi
->agi_newino
= cpu_to_be32(NULLAGINO
);
310 agi
->agi_dirino
= cpu_to_be32(NULLAGINO
);
311 if (xfs_sb_version_hascrc(&mp
->m_sb
))
312 uuid_copy(&agi
->agi_uuid
, &mp
->m_sb
.sb_uuid
);
313 if (xfs_sb_version_hasfinobt(&mp
->m_sb
)) {
314 agi
->agi_free_root
= cpu_to_be32(XFS_FIBT_BLOCK(mp
));
315 agi
->agi_free_level
= cpu_to_be32(1);
317 for (bucket
= 0; bucket
< XFS_AGI_UNLINKED_BUCKETS
; bucket
++)
318 agi
->agi_unlinked
[bucket
] = cpu_to_be32(NULLAGINO
);
320 error
= xfs_bwrite(bp
);
326 * BNO btree root block
328 bp
= xfs_growfs_get_hdr_buf(mp
,
329 XFS_AGB_TO_DADDR(mp
, agno
, XFS_BNO_BLOCK(mp
)),
330 BTOBB(mp
->m_sb
.sb_blocksize
), 0,
331 &xfs_allocbt_buf_ops
);
338 if (xfs_sb_version_hascrc(&mp
->m_sb
))
339 xfs_btree_init_block(mp
, bp
, XFS_ABTB_CRC_MAGIC
, 0, 1,
340 agno
, XFS_BTREE_CRC_BLOCKS
);
342 xfs_btree_init_block(mp
, bp
, XFS_ABTB_MAGIC
, 0, 1,
345 arec
= XFS_ALLOC_REC_ADDR(mp
, XFS_BUF_TO_BLOCK(bp
), 1);
346 arec
->ar_startblock
= cpu_to_be32(XFS_PREALLOC_BLOCKS(mp
));
347 arec
->ar_blockcount
= cpu_to_be32(
348 agsize
- be32_to_cpu(arec
->ar_startblock
));
350 error
= xfs_bwrite(bp
);
356 * CNT btree root block
358 bp
= xfs_growfs_get_hdr_buf(mp
,
359 XFS_AGB_TO_DADDR(mp
, agno
, XFS_CNT_BLOCK(mp
)),
360 BTOBB(mp
->m_sb
.sb_blocksize
), 0,
361 &xfs_allocbt_buf_ops
);
367 if (xfs_sb_version_hascrc(&mp
->m_sb
))
368 xfs_btree_init_block(mp
, bp
, XFS_ABTC_CRC_MAGIC
, 0, 1,
369 agno
, XFS_BTREE_CRC_BLOCKS
);
371 xfs_btree_init_block(mp
, bp
, XFS_ABTC_MAGIC
, 0, 1,
374 arec
= XFS_ALLOC_REC_ADDR(mp
, XFS_BUF_TO_BLOCK(bp
), 1);
375 arec
->ar_startblock
= cpu_to_be32(XFS_PREALLOC_BLOCKS(mp
));
376 arec
->ar_blockcount
= cpu_to_be32(
377 agsize
- be32_to_cpu(arec
->ar_startblock
));
378 nfree
+= be32_to_cpu(arec
->ar_blockcount
);
380 error
= xfs_bwrite(bp
);
386 * INO btree root block
388 bp
= xfs_growfs_get_hdr_buf(mp
,
389 XFS_AGB_TO_DADDR(mp
, agno
, XFS_IBT_BLOCK(mp
)),
390 BTOBB(mp
->m_sb
.sb_blocksize
), 0,
397 if (xfs_sb_version_hascrc(&mp
->m_sb
))
398 xfs_btree_init_block(mp
, bp
, XFS_IBT_CRC_MAGIC
, 0, 0,
399 agno
, XFS_BTREE_CRC_BLOCKS
);
401 xfs_btree_init_block(mp
, bp
, XFS_IBT_MAGIC
, 0, 0,
404 error
= xfs_bwrite(bp
);
410 * FINO btree root block
412 if (xfs_sb_version_hasfinobt(&mp
->m_sb
)) {
413 bp
= xfs_growfs_get_hdr_buf(mp
,
414 XFS_AGB_TO_DADDR(mp
, agno
, XFS_FIBT_BLOCK(mp
)),
415 BTOBB(mp
->m_sb
.sb_blocksize
), 0,
422 if (xfs_sb_version_hascrc(&mp
->m_sb
))
423 xfs_btree_init_block(mp
, bp
, XFS_FIBT_CRC_MAGIC
,
425 XFS_BTREE_CRC_BLOCKS
);
427 xfs_btree_init_block(mp
, bp
, XFS_FIBT_MAGIC
, 0,
430 error
= xfs_bwrite(bp
);
437 xfs_trans_agblocks_delta(tp
, nfree
);
439 * There are new blocks in the old last a.g.
443 * Change the agi length.
445 error
= xfs_ialloc_read_agi(mp
, tp
, agno
, &bp
);
450 agi
= XFS_BUF_TO_AGI(bp
);
451 be32_add_cpu(&agi
->agi_length
, new);
452 ASSERT(nagcount
== oagcount
||
453 be32_to_cpu(agi
->agi_length
) == mp
->m_sb
.sb_agblocks
);
454 xfs_ialloc_log_agi(tp
, bp
, XFS_AGI_LENGTH
);
458 error
= xfs_alloc_read_agf(mp
, tp
, agno
, 0, &bp
);
463 agf
= XFS_BUF_TO_AGF(bp
);
464 be32_add_cpu(&agf
->agf_length
, new);
465 ASSERT(be32_to_cpu(agf
->agf_length
) ==
466 be32_to_cpu(agi
->agi_length
));
468 xfs_alloc_log_agf(tp
, bp
, XFS_AGF_LENGTH
);
470 * Free the new space.
472 error
= xfs_free_extent(tp
, XFS_AGB_TO_FSB(mp
, agno
,
473 be32_to_cpu(agf
->agf_length
) - new), new);
480 * Update changed superblock fields transactionally. These are not
481 * seen by the rest of the world until the transaction commit applies
482 * them atomically to the superblock.
484 if (nagcount
> oagcount
)
485 xfs_trans_mod_sb(tp
, XFS_TRANS_SB_AGCOUNT
, nagcount
- oagcount
);
486 if (nb
> mp
->m_sb
.sb_dblocks
)
487 xfs_trans_mod_sb(tp
, XFS_TRANS_SB_DBLOCKS
,
488 nb
- mp
->m_sb
.sb_dblocks
);
490 xfs_trans_mod_sb(tp
, XFS_TRANS_SB_FDBLOCKS
, nfree
);
492 xfs_trans_mod_sb(tp
, XFS_TRANS_SB_IMAXPCT
, dpct
);
493 error
= xfs_trans_commit(tp
, 0);
497 /* New allocation groups fully initialized, so update mount struct */
499 mp
->m_maxagi
= nagimax
;
500 if (mp
->m_sb
.sb_imax_pct
) {
501 __uint64_t icount
= mp
->m_sb
.sb_dblocks
* mp
->m_sb
.sb_imax_pct
;
503 mp
->m_maxicount
= icount
<< mp
->m_sb
.sb_inopblog
;
506 xfs_set_low_space_thresholds(mp
);
508 /* update secondary superblocks. */
509 for (agno
= 1; agno
< nagcount
; agno
++) {
512 * new secondary superblocks need to be zeroed, not read from
513 * disk as the contents of the new area we are growing into is
514 * completely unknown.
516 if (agno
< oagcount
) {
517 error
= xfs_trans_read_buf(mp
, NULL
, mp
->m_ddev_targp
,
518 XFS_AGB_TO_DADDR(mp
, agno
, XFS_SB_BLOCK(mp
)),
519 XFS_FSS_TO_BB(mp
, 1), 0, &bp
,
522 bp
= xfs_trans_get_buf(NULL
, mp
->m_ddev_targp
,
523 XFS_AGB_TO_DADDR(mp
, agno
, XFS_SB_BLOCK(mp
)),
524 XFS_FSS_TO_BB(mp
, 1), 0);
526 bp
->b_ops
= &xfs_sb_buf_ops
;
527 xfs_buf_zero(bp
, 0, BBTOB(bp
->b_length
));
533 * If we get an error reading or writing alternate superblocks,
534 * continue. xfs_repair chooses the "best" superblock based
535 * on most matches; if we break early, we'll leave more
536 * superblocks un-updated than updated, and xfs_repair may
537 * pick them over the properly-updated primary.
541 "error %d reading secondary superblock for ag %d",
546 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp
), &mp
->m_sb
, XFS_SB_ALL_BITS
);
548 error
= xfs_bwrite(bp
);
552 "write error %d updating secondary superblock for ag %d",
558 return saved_error
? saved_error
: error
;
561 xfs_trans_cancel(tp
, XFS_TRANS_ABORT
);
566 xfs_growfs_log_private(
567 xfs_mount_t
*mp
, /* mount point for filesystem */
568 xfs_growfs_log_t
*in
) /* growfs log input struct */
573 if (nb
< XFS_MIN_LOG_BLOCKS
|| nb
< XFS_B_TO_FSB(mp
, XFS_MIN_LOG_BYTES
))
575 if (nb
== mp
->m_sb
.sb_logblocks
&&
576 in
->isint
== (mp
->m_sb
.sb_logstart
!= 0))
579 * Moving the log is hard, need new interfaces to sync
580 * the log first, hold off all activity while moving it.
581 * Can have shorter or longer log in the same space,
582 * or transform internal to external log or vice versa.
588 * protected versions of growfs function acquire and release locks on the mount
589 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
597 xfs_growfs_data_t
*in
)
601 if (!capable(CAP_SYS_ADMIN
))
603 if (!mutex_trylock(&mp
->m_growlock
))
605 error
= xfs_growfs_data_private(mp
, in
);
606 mutex_unlock(&mp
->m_growlock
);
613 xfs_growfs_log_t
*in
)
617 if (!capable(CAP_SYS_ADMIN
))
619 if (!mutex_trylock(&mp
->m_growlock
))
621 error
= xfs_growfs_log_private(mp
, in
);
622 mutex_unlock(&mp
->m_growlock
);
627 * exported through ioctl XFS_IOC_FSCOUNTS
633 xfs_fsop_counts_t
*cnt
)
635 xfs_icsb_sync_counters(mp
, XFS_ICSB_LAZY_COUNT
);
636 spin_lock(&mp
->m_sb_lock
);
637 cnt
->freedata
= mp
->m_sb
.sb_fdblocks
- XFS_ALLOC_SET_ASIDE(mp
);
638 cnt
->freertx
= mp
->m_sb
.sb_frextents
;
639 cnt
->freeino
= mp
->m_sb
.sb_ifree
;
640 cnt
->allocino
= mp
->m_sb
.sb_icount
;
641 spin_unlock(&mp
->m_sb_lock
);
646 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
648 * xfs_reserve_blocks is called to set m_resblks
649 * in the in-core mount table. The number of unused reserved blocks
650 * is kept in m_resblks_avail.
652 * Reserve the requested number of blocks if available. Otherwise return
653 * as many as possible to satisfy the request. The actual number
654 * reserved are returned in outval
656 * A null inval pointer indicates that only the current reserved blocks
657 * available should be returned no settings are changed.
664 xfs_fsop_resblks_t
*outval
)
666 __int64_t lcounter
, delta
, fdblks_delta
;
669 /* If inval is null, report current values and return */
670 if (inval
== (__uint64_t
*)NULL
) {
673 outval
->resblks
= mp
->m_resblks
;
674 outval
->resblks_avail
= mp
->m_resblks_avail
;
681 * With per-cpu counters, this becomes an interesting
682 * problem. we needto work out if we are freeing or allocation
683 * blocks first, then we can do the modification as necessary.
685 * We do this under the m_sb_lock so that if we are near
686 * ENOSPC, we will hold out any changes while we work out
687 * what to do. This means that the amount of free space can
688 * change while we do this, so we need to retry if we end up
689 * trying to reserve more space than is available.
691 * We also use the xfs_mod_incore_sb() interface so that we
692 * don't have to care about whether per cpu counter are
693 * enabled, disabled or even compiled in....
696 spin_lock(&mp
->m_sb_lock
);
697 xfs_icsb_sync_counters_locked(mp
, 0);
700 * If our previous reservation was larger than the current value,
701 * then move any unused blocks back to the free pool.
704 if (mp
->m_resblks
> request
) {
705 lcounter
= mp
->m_resblks_avail
- request
;
706 if (lcounter
> 0) { /* release unused blocks */
707 fdblks_delta
= lcounter
;
708 mp
->m_resblks_avail
-= lcounter
;
710 mp
->m_resblks
= request
;
714 free
= mp
->m_sb
.sb_fdblocks
- XFS_ALLOC_SET_ASIDE(mp
);
716 goto out
; /* ENOSPC and fdblks_delta = 0 */
718 delta
= request
- mp
->m_resblks
;
719 lcounter
= free
- delta
;
721 /* We can't satisfy the request, just get what we can */
722 mp
->m_resblks
+= free
;
723 mp
->m_resblks_avail
+= free
;
724 fdblks_delta
= -free
;
726 fdblks_delta
= -delta
;
727 mp
->m_resblks
= request
;
728 mp
->m_resblks_avail
+= delta
;
733 outval
->resblks
= mp
->m_resblks
;
734 outval
->resblks_avail
= mp
->m_resblks_avail
;
736 spin_unlock(&mp
->m_sb_lock
);
740 * If we are putting blocks back here, m_resblks_avail is
741 * already at its max so this will put it in the free pool.
743 * If we need space, we'll either succeed in getting it
744 * from the free block count or we'll get an enospc. If
745 * we get a ENOSPC, it means things changed while we were
746 * calculating fdblks_delta and so we should try again to
747 * see if there is anything left to reserve.
749 * Don't set the reserved flag here - we don't want to reserve
750 * the extra reserve blocks from the reserve.....
753 error
= xfs_icsb_modify_counters(mp
, XFS_SBS_FDBLOCKS
,
755 if (error
== -ENOSPC
)
762 * Dump a transaction into the log that contains no real change. This is needed
763 * to be able to make the log dirty or stamp the current tail LSN into the log
764 * during the covering operation.
766 * We cannot use an inode here for this - that will push dirty state back up
767 * into the VFS and then periodic inode flushing will prevent log covering from
768 * making progress. Hence we log a field in the superblock instead and use a
769 * synchronous transaction to ensure the superblock is immediately unpinned
770 * and can be written back.
779 tp
= _xfs_trans_alloc(mp
, XFS_TRANS_DUMMY1
, KM_SLEEP
);
780 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_sb
, 0, 0);
782 xfs_trans_cancel(tp
, 0);
786 /* log the UUID because it is an unchanging field */
787 xfs_mod_sb(tp
, XFS_SB_UUID
);
788 xfs_trans_set_sync(tp
);
789 return xfs_trans_commit(tp
, 0);
798 case XFS_FSOP_GOING_FLAGS_DEFAULT
: {
799 struct super_block
*sb
= freeze_bdev(mp
->m_super
->s_bdev
);
801 if (sb
&& !IS_ERR(sb
)) {
802 xfs_force_shutdown(mp
, SHUTDOWN_FORCE_UMOUNT
);
803 thaw_bdev(sb
->s_bdev
, sb
);
808 case XFS_FSOP_GOING_FLAGS_LOGFLUSH
:
809 xfs_force_shutdown(mp
, SHUTDOWN_FORCE_UMOUNT
);
811 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH
:
812 xfs_force_shutdown(mp
,
813 SHUTDOWN_FORCE_UMOUNT
| SHUTDOWN_LOG_IO_ERROR
);
823 * Force a shutdown of the filesystem instantly while keeping the filesystem
824 * consistent. We don't do an unmount here; just shutdown the shop, make sure
825 * that absolutely nothing persistent happens to this filesystem after this
829 xfs_do_force_shutdown(
837 logerror
= flags
& SHUTDOWN_LOG_IO_ERROR
;
839 if (!(flags
& SHUTDOWN_FORCE_UMOUNT
)) {
841 "%s(0x%x) called from line %d of file %s. Return address = 0x%p",
842 __func__
, flags
, lnnum
, fname
, __return_address
);
845 * No need to duplicate efforts.
847 if (XFS_FORCED_SHUTDOWN(mp
) && !logerror
)
851 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
852 * queue up anybody new on the log reservations, and wakes up
853 * everybody who's sleeping on log reservations to tell them
856 if (xfs_log_force_umount(mp
, logerror
))
859 if (flags
& SHUTDOWN_CORRUPT_INCORE
) {
860 xfs_alert_tag(mp
, XFS_PTAG_SHUTDOWN_CORRUPT
,
861 "Corruption of in-memory data detected. Shutting down filesystem");
862 if (XFS_ERRLEVEL_HIGH
<= xfs_error_level
)
864 } else if (!(flags
& SHUTDOWN_FORCE_UMOUNT
)) {
866 xfs_alert_tag(mp
, XFS_PTAG_SHUTDOWN_LOGERROR
,
867 "Log I/O Error Detected. Shutting down filesystem");
868 } else if (flags
& SHUTDOWN_DEVICE_REQ
) {
869 xfs_alert_tag(mp
, XFS_PTAG_SHUTDOWN_IOERROR
,
870 "All device paths lost. Shutting down filesystem");
871 } else if (!(flags
& SHUTDOWN_REMOTE_REQ
)) {
872 xfs_alert_tag(mp
, XFS_PTAG_SHUTDOWN_IOERROR
,
873 "I/O Error Detected. Shutting down filesystem");
876 if (!(flags
& SHUTDOWN_FORCE_UMOUNT
)) {
878 "Please umount the filesystem and rectify the problem(s)");