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_inode.h"
28 #include "xfs_trans.h"
29 #include "xfs_inode_item.h"
30 #include "xfs_error.h"
31 #include "xfs_btree.h"
32 #include "xfs_alloc_btree.h"
33 #include "xfs_alloc.h"
34 #include "xfs_ialloc.h"
35 #include "xfs_fsops.h"
36 #include "xfs_itable.h"
37 #include "xfs_trans_space.h"
38 #include "xfs_rtalloc.h"
39 #include "xfs_trace.h"
41 #include "xfs_dinode.h"
42 #include "xfs_filestream.h"
45 * File system operations
55 memset(geo, 0, sizeof(*geo));
57 geo->blocksize = mp->m_sb.sb_blocksize;
58 geo->rtextsize = mp->m_sb.sb_rextsize;
59 geo->agblocks = mp->m_sb.sb_agblocks;
60 geo->agcount = mp->m_sb.sb_agcount;
61 geo->logblocks = mp->m_sb.sb_logblocks;
62 geo->sectsize = mp->m_sb.sb_sectsize;
63 geo->inodesize = mp->m_sb.sb_inodesize;
64 geo->imaxpct = mp->m_sb.sb_imax_pct;
65 geo->datablocks = mp->m_sb.sb_dblocks;
66 geo->rtblocks = mp->m_sb.sb_rblocks;
67 geo->rtextents = mp->m_sb.sb_rextents;
68 geo->logstart = mp->m_sb.sb_logstart;
69 ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
70 memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
71 if (new_version >= 2) {
72 geo->sunit = mp->m_sb.sb_unit;
73 geo->swidth = mp->m_sb.sb_width;
75 if (new_version >= 3) {
76 geo->version = XFS_FSOP_GEOM_VERSION;
78 (xfs_sb_version_hasattr(&mp->m_sb) ?
79 XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
80 (xfs_sb_version_hasnlink(&mp->m_sb) ?
81 XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
82 (xfs_sb_version_hasquota(&mp->m_sb) ?
83 XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
84 (xfs_sb_version_hasalign(&mp->m_sb) ?
85 XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
86 (xfs_sb_version_hasdalign(&mp->m_sb) ?
87 XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
88 (xfs_sb_version_hasshared(&mp->m_sb) ?
89 XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
90 (xfs_sb_version_hasextflgbit(&mp->m_sb) ?
91 XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
92 (xfs_sb_version_hasdirv2(&mp->m_sb) ?
93 XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
94 (xfs_sb_version_hassector(&mp->m_sb) ?
95 XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
96 (xfs_sb_version_hasasciici(&mp->m_sb) ?
97 XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
98 (xfs_sb_version_haslazysbcount(&mp->m_sb) ?
99 XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
100 (xfs_sb_version_hasattr2(&mp->m_sb) ?
101 XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
102 (xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
103 XFS_FSOP_GEOM_FLAGS_PROJID32 : 0) |
104 (xfs_sb_version_hascrc(&mp->m_sb) ?
105 XFS_FSOP_GEOM_FLAGS_V5SB : 0) |
106 (xfs_sb_version_hasftype(&mp->m_sb) ?
107 XFS_FSOP_GEOM_FLAGS_FTYPE : 0);
108 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
109 mp->m_sb.sb_logsectsize : BBSIZE;
110 geo->rtsectsize = mp->m_sb.sb_blocksize;
111 geo->dirblocksize = mp->m_dirblksize;
113 if (new_version >= 4) {
115 (xfs_sb_version_haslogv2(&mp->m_sb) ?
116 XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
117 geo->logsunit = mp->m_sb.sb_logsunit;
122 static struct xfs_buf *
123 xfs_growfs_get_hdr_buf(
124 struct xfs_mount *mp,
128 const struct xfs_buf_ops *ops)
132 bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
136 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
138 bp->b_maps[0].bm_bn = blkno;
145 xfs_growfs_data_private(
146 xfs_mount_t *mp, /* mount point for filesystem */
147 xfs_growfs_data_t *in) /* growfs data input struct */
150 struct xfs_agfl *agfl;
154 xfs_extlen_t tmpsize;
155 xfs_alloc_rec_t *arec;
159 int error, saved_error = 0;
160 xfs_agnumber_t nagcount;
161 xfs_agnumber_t nagimax = 0;
162 xfs_rfsblock_t nb, nb_mod;
164 xfs_rfsblock_t nfree;
165 xfs_agnumber_t oagcount;
171 if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
172 return XFS_ERROR(EINVAL);
173 if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
175 dpct = pct - mp->m_sb.sb_imax_pct;
176 bp = xfs_buf_read_uncached(mp->m_ddev_targp,
177 XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
178 XFS_FSS_TO_BB(mp, 1), 0, NULL);
188 new = nb; /* use new as a temporary here */
189 nb_mod = do_div(new, mp->m_sb.sb_agblocks);
190 nagcount = new + (nb_mod != 0);
191 if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
193 nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
194 if (nb < mp->m_sb.sb_dblocks)
195 return XFS_ERROR(EINVAL);
197 new = nb - mp->m_sb.sb_dblocks;
198 oagcount = mp->m_sb.sb_agcount;
200 /* allocate the new per-ag structures */
201 if (nagcount > oagcount) {
202 error = xfs_initialize_perag(mp, nagcount, &nagimax);
207 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
208 tp->t_flags |= XFS_TRANS_RESERVE;
209 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growdata,
210 XFS_GROWFS_SPACE_RES(mp), 0);
212 xfs_trans_cancel(tp, 0);
217 * Write new AG headers to disk. Non-transactional, but written
218 * synchronously so they are completed prior to the growfs transaction
222 for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
226 * AG freespace header block
228 bp = xfs_growfs_get_hdr_buf(mp,
229 XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
230 XFS_FSS_TO_BB(mp, 1), 0,
237 agf = XFS_BUF_TO_AGF(bp);
238 agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
239 agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
240 agf->agf_seqno = cpu_to_be32(agno);
241 if (agno == nagcount - 1)
244 (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
246 agsize = mp->m_sb.sb_agblocks;
247 agf->agf_length = cpu_to_be32(agsize);
248 agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
249 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
250 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
251 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
252 agf->agf_flfirst = 0;
253 agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
254 agf->agf_flcount = 0;
255 tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
256 agf->agf_freeblks = cpu_to_be32(tmpsize);
257 agf->agf_longest = cpu_to_be32(tmpsize);
258 if (xfs_sb_version_hascrc(&mp->m_sb))
259 uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid);
261 error = xfs_bwrite(bp);
267 * AG freelist header block
269 bp = xfs_growfs_get_hdr_buf(mp,
270 XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
271 XFS_FSS_TO_BB(mp, 1), 0,
278 agfl = XFS_BUF_TO_AGFL(bp);
279 if (xfs_sb_version_hascrc(&mp->m_sb)) {
280 agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
281 agfl->agfl_seqno = cpu_to_be32(agno);
282 uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid);
285 agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
286 for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
287 agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
289 error = xfs_bwrite(bp);
295 * AG inode header block
297 bp = xfs_growfs_get_hdr_buf(mp,
298 XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
299 XFS_FSS_TO_BB(mp, 1), 0,
306 agi = XFS_BUF_TO_AGI(bp);
307 agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
308 agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
309 agi->agi_seqno = cpu_to_be32(agno);
310 agi->agi_length = cpu_to_be32(agsize);
312 agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
313 agi->agi_level = cpu_to_be32(1);
314 agi->agi_freecount = 0;
315 agi->agi_newino = cpu_to_be32(NULLAGINO);
316 agi->agi_dirino = cpu_to_be32(NULLAGINO);
317 if (xfs_sb_version_hascrc(&mp->m_sb))
318 uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
319 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
320 agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
321 agi->agi_free_level = cpu_to_be32(1);
323 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
324 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
326 error = xfs_bwrite(bp);
332 * BNO btree root block
334 bp = xfs_growfs_get_hdr_buf(mp,
335 XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
336 BTOBB(mp->m_sb.sb_blocksize), 0,
337 &xfs_allocbt_buf_ops);
344 if (xfs_sb_version_hascrc(&mp->m_sb))
345 xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
346 agno, XFS_BTREE_CRC_BLOCKS);
348 xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
351 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
352 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
353 arec->ar_blockcount = cpu_to_be32(
354 agsize - be32_to_cpu(arec->ar_startblock));
356 error = xfs_bwrite(bp);
362 * CNT btree root block
364 bp = xfs_growfs_get_hdr_buf(mp,
365 XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
366 BTOBB(mp->m_sb.sb_blocksize), 0,
367 &xfs_allocbt_buf_ops);
373 if (xfs_sb_version_hascrc(&mp->m_sb))
374 xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
375 agno, XFS_BTREE_CRC_BLOCKS);
377 xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
380 arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
381 arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
382 arec->ar_blockcount = cpu_to_be32(
383 agsize - be32_to_cpu(arec->ar_startblock));
384 nfree += be32_to_cpu(arec->ar_blockcount);
386 error = xfs_bwrite(bp);
392 * INO btree root block
394 bp = xfs_growfs_get_hdr_buf(mp,
395 XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
396 BTOBB(mp->m_sb.sb_blocksize), 0,
403 if (xfs_sb_version_hascrc(&mp->m_sb))
404 xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
405 agno, XFS_BTREE_CRC_BLOCKS);
407 xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
410 error = xfs_bwrite(bp);
416 * FINO btree root block
418 if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
419 bp = xfs_growfs_get_hdr_buf(mp,
420 XFS_AGB_TO_DADDR(mp, agno, XFS_FIBT_BLOCK(mp)),
421 BTOBB(mp->m_sb.sb_blocksize), 0,
428 if (xfs_sb_version_hascrc(&mp->m_sb))
429 xfs_btree_init_block(mp, bp, XFS_FIBT_CRC_MAGIC,
431 XFS_BTREE_CRC_BLOCKS);
433 xfs_btree_init_block(mp, bp, XFS_FIBT_MAGIC, 0,
436 error = xfs_bwrite(bp);
443 xfs_trans_agblocks_delta(tp, nfree);
445 * There are new blocks in the old last a.g.
449 * Change the agi length.
451 error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
456 agi = XFS_BUF_TO_AGI(bp);
457 be32_add_cpu(&agi->agi_length, new);
458 ASSERT(nagcount == oagcount ||
459 be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
460 xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
464 error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
469 agf = XFS_BUF_TO_AGF(bp);
470 be32_add_cpu(&agf->agf_length, new);
471 ASSERT(be32_to_cpu(agf->agf_length) ==
472 be32_to_cpu(agi->agi_length));
474 xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
476 * Free the new space.
478 error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
479 be32_to_cpu(agf->agf_length) - new), new);
486 * Update changed superblock fields transactionally. These are not
487 * seen by the rest of the world until the transaction commit applies
488 * them atomically to the superblock.
490 if (nagcount > oagcount)
491 xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
492 if (nb > mp->m_sb.sb_dblocks)
493 xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
494 nb - mp->m_sb.sb_dblocks);
496 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
498 xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
499 error = xfs_trans_commit(tp, 0);
503 /* New allocation groups fully initialized, so update mount struct */
505 mp->m_maxagi = nagimax;
506 if (mp->m_sb.sb_imax_pct) {
507 __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
509 mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
512 xfs_set_low_space_thresholds(mp);
514 /* update secondary superblocks. */
515 for (agno = 1; agno < nagcount; agno++) {
518 * new secondary superblocks need to be zeroed, not read from
519 * disk as the contents of the new area we are growing into is
520 * completely unknown.
522 if (agno < oagcount) {
523 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
524 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
525 XFS_FSS_TO_BB(mp, 1), 0, &bp,
528 bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
529 XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
530 XFS_FSS_TO_BB(mp, 1), 0);
532 bp->b_ops = &xfs_sb_buf_ops;
533 xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
539 * If we get an error reading or writing alternate superblocks,
540 * continue. xfs_repair chooses the "best" superblock based
541 * on most matches; if we break early, we'll leave more
542 * superblocks un-updated than updated, and xfs_repair may
543 * pick them over the properly-updated primary.
547 "error %d reading secondary superblock for ag %d",
552 xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
554 error = xfs_bwrite(bp);
558 "write error %d updating secondary superblock for ag %d",
564 return saved_error ? saved_error : error;
567 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
572 xfs_growfs_log_private(
573 xfs_mount_t *mp, /* mount point for filesystem */
574 xfs_growfs_log_t *in) /* growfs log input struct */
579 if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
580 return XFS_ERROR(EINVAL);
581 if (nb == mp->m_sb.sb_logblocks &&
582 in->isint == (mp->m_sb.sb_logstart != 0))
583 return XFS_ERROR(EINVAL);
585 * Moving the log is hard, need new interfaces to sync
586 * the log first, hold off all activity while moving it.
587 * Can have shorter or longer log in the same space,
588 * or transform internal to external log or vice versa.
590 return XFS_ERROR(ENOSYS);
594 * protected versions of growfs function acquire and release locks on the mount
595 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
603 xfs_growfs_data_t *in)
607 if (!capable(CAP_SYS_ADMIN))
608 return XFS_ERROR(EPERM);
609 if (!mutex_trylock(&mp->m_growlock))
610 return XFS_ERROR(EWOULDBLOCK);
611 error = xfs_growfs_data_private(mp, in);
612 mutex_unlock(&mp->m_growlock);
619 xfs_growfs_log_t *in)
623 if (!capable(CAP_SYS_ADMIN))
624 return XFS_ERROR(EPERM);
625 if (!mutex_trylock(&mp->m_growlock))
626 return XFS_ERROR(EWOULDBLOCK);
627 error = xfs_growfs_log_private(mp, in);
628 mutex_unlock(&mp->m_growlock);
633 * exported through ioctl XFS_IOC_FSCOUNTS
639 xfs_fsop_counts_t *cnt)
641 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
642 spin_lock(&mp->m_sb_lock);
643 cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
644 cnt->freertx = mp->m_sb.sb_frextents;
645 cnt->freeino = mp->m_sb.sb_ifree;
646 cnt->allocino = mp->m_sb.sb_icount;
647 spin_unlock(&mp->m_sb_lock);
652 * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
654 * xfs_reserve_blocks is called to set m_resblks
655 * in the in-core mount table. The number of unused reserved blocks
656 * is kept in m_resblks_avail.
658 * Reserve the requested number of blocks if available. Otherwise return
659 * as many as possible to satisfy the request. The actual number
660 * reserved are returned in outval
662 * A null inval pointer indicates that only the current reserved blocks
663 * available should be returned no settings are changed.
670 xfs_fsop_resblks_t *outval)
672 __int64_t lcounter, delta, fdblks_delta;
675 /* If inval is null, report current values and return */
676 if (inval == (__uint64_t *)NULL) {
679 outval->resblks = mp->m_resblks;
680 outval->resblks_avail = mp->m_resblks_avail;
687 * With per-cpu counters, this becomes an interesting
688 * problem. we needto work out if we are freeing or allocation
689 * blocks first, then we can do the modification as necessary.
691 * We do this under the m_sb_lock so that if we are near
692 * ENOSPC, we will hold out any changes while we work out
693 * what to do. This means that the amount of free space can
694 * change while we do this, so we need to retry if we end up
695 * trying to reserve more space than is available.
697 * We also use the xfs_mod_incore_sb() interface so that we
698 * don't have to care about whether per cpu counter are
699 * enabled, disabled or even compiled in....
702 spin_lock(&mp->m_sb_lock);
703 xfs_icsb_sync_counters_locked(mp, 0);
706 * If our previous reservation was larger than the current value,
707 * then move any unused blocks back to the free pool.
710 if (mp->m_resblks > request) {
711 lcounter = mp->m_resblks_avail - request;
712 if (lcounter > 0) { /* release unused blocks */
713 fdblks_delta = lcounter;
714 mp->m_resblks_avail -= lcounter;
716 mp->m_resblks = request;
720 free = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
722 goto out; /* ENOSPC and fdblks_delta = 0 */
724 delta = request - mp->m_resblks;
725 lcounter = free - delta;
727 /* We can't satisfy the request, just get what we can */
728 mp->m_resblks += free;
729 mp->m_resblks_avail += free;
730 fdblks_delta = -free;
732 fdblks_delta = -delta;
733 mp->m_resblks = request;
734 mp->m_resblks_avail += delta;
739 outval->resblks = mp->m_resblks;
740 outval->resblks_avail = mp->m_resblks_avail;
742 spin_unlock(&mp->m_sb_lock);
746 * If we are putting blocks back here, m_resblks_avail is
747 * already at its max so this will put it in the free pool.
749 * If we need space, we'll either succeed in getting it
750 * from the free block count or we'll get an enospc. If
751 * we get a ENOSPC, it means things changed while we were
752 * calculating fdblks_delta and so we should try again to
753 * see if there is anything left to reserve.
755 * Don't set the reserved flag here - we don't want to reserve
756 * the extra reserve blocks from the reserve.....
759 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
768 * Dump a transaction into the log that contains no real change. This is needed
769 * to be able to make the log dirty or stamp the current tail LSN into the log
770 * during the covering operation.
772 * We cannot use an inode here for this - that will push dirty state back up
773 * into the VFS and then periodic inode flushing will prevent log covering from
774 * making progress. Hence we log a field in the superblock instead and use a
775 * synchronous transaction to ensure the superblock is immediately unpinned
776 * and can be written back.
785 tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
786 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0);
788 xfs_trans_cancel(tp, 0);
792 /* log the UUID because it is an unchanging field */
793 xfs_mod_sb(tp, XFS_SB_UUID);
794 xfs_trans_set_sync(tp);
795 return xfs_trans_commit(tp, 0);
804 case XFS_FSOP_GOING_FLAGS_DEFAULT: {
805 struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
807 if (sb && !IS_ERR(sb)) {
808 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
809 thaw_bdev(sb->s_bdev, sb);
814 case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
815 xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
817 case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
818 xfs_force_shutdown(mp,
819 SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
822 return XFS_ERROR(EINVAL);
829 * Force a shutdown of the filesystem instantly while keeping the filesystem
830 * consistent. We don't do an unmount here; just shutdown the shop, make sure
831 * that absolutely nothing persistent happens to this filesystem after this
835 xfs_do_force_shutdown(
843 logerror = flags & SHUTDOWN_LOG_IO_ERROR;
845 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
847 "%s(0x%x) called from line %d of file %s. Return address = 0x%p",
848 __func__, flags, lnnum, fname, __return_address);
851 * No need to duplicate efforts.
853 if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
857 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
858 * queue up anybody new on the log reservations, and wakes up
859 * everybody who's sleeping on log reservations to tell them
862 if (xfs_log_force_umount(mp, logerror))
865 if (flags & SHUTDOWN_CORRUPT_INCORE) {
866 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
867 "Corruption of in-memory data detected. Shutting down filesystem");
868 if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
870 } else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
872 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
873 "Log I/O Error Detected. Shutting down filesystem");
874 } else if (flags & SHUTDOWN_DEVICE_REQ) {
875 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
876 "All device paths lost. Shutting down filesystem");
877 } else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
878 xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
879 "I/O Error Detected. Shutting down filesystem");
882 if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
884 "Please umount the filesystem and rectify the problem(s)");