2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * Copyright (C) 2010 Red Hat, Inc.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it would be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "xfs_shared.h"
22 #include "xfs_format.h"
23 #include "xfs_log_format.h"
24 #include "xfs_trans_resv.h"
25 #include "xfs_mount.h"
26 #include "xfs_inode.h"
27 #include "xfs_extent_busy.h"
28 #include "xfs_quota.h"
29 #include "xfs_trans.h"
30 #include "xfs_trans_priv.h"
32 #include "xfs_trace.h"
33 #include "xfs_error.h"
35 kmem_zone_t *xfs_trans_zone;
36 kmem_zone_t *xfs_log_item_desc_zone;
39 * Initialize the precomputed transaction reservation values
40 * in the mount structure.
46 xfs_trans_resv_calc(mp, M_RES(mp));
50 * This routine is called to allocate a transaction structure.
51 * The type parameter indicates the type of the transaction. These
52 * are enumerated in xfs_trans.h.
54 * Dynamically allocate the transaction structure from the transaction
55 * zone, initialize it, and return it to the caller.
64 sb_start_intwrite(mp->m_super);
65 tp = _xfs_trans_alloc(mp, type, KM_SLEEP);
66 tp->t_flags |= XFS_TRANS_FREEZE_PROT;
74 xfs_km_flags_t memflags)
78 WARN_ON(mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
79 atomic_inc(&mp->m_active_trans);
81 tp = kmem_zone_zalloc(xfs_trans_zone, memflags);
82 tp->t_magic = XFS_TRANS_HEADER_MAGIC;
85 INIT_LIST_HEAD(&tp->t_items);
86 INIT_LIST_HEAD(&tp->t_busy);
91 * Free the transaction structure. If there is more clean up
92 * to do when the structure is freed, add it here.
98 xfs_extent_busy_sort(&tp->t_busy);
99 xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false);
101 atomic_dec(&tp->t_mountp->m_active_trans);
102 if (tp->t_flags & XFS_TRANS_FREEZE_PROT)
103 sb_end_intwrite(tp->t_mountp->m_super);
104 xfs_trans_free_dqinfo(tp);
105 kmem_zone_free(xfs_trans_zone, tp);
109 * This is called to create a new transaction which will share the
110 * permanent log reservation of the given transaction. The remaining
111 * unused block and rt extent reservations are also inherited. This
112 * implies that the original transaction is no longer allowed to allocate
113 * blocks. Locks and log items, however, are no inherited. They must
114 * be added to the new transaction explicitly.
122 ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
125 * Initialize the new transaction structure.
127 ntp->t_magic = XFS_TRANS_HEADER_MAGIC;
128 ntp->t_type = tp->t_type;
129 ntp->t_mountp = tp->t_mountp;
130 INIT_LIST_HEAD(&ntp->t_items);
131 INIT_LIST_HEAD(&ntp->t_busy);
133 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
134 ASSERT(tp->t_ticket != NULL);
136 ntp->t_flags = XFS_TRANS_PERM_LOG_RES |
137 (tp->t_flags & XFS_TRANS_RESERVE) |
138 (tp->t_flags & XFS_TRANS_FREEZE_PROT);
139 /* We gave our writer reference to the new transaction */
140 tp->t_flags &= ~XFS_TRANS_FREEZE_PROT;
141 ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
142 ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
143 tp->t_blk_res = tp->t_blk_res_used;
144 ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
145 tp->t_rtx_res = tp->t_rtx_res_used;
146 ntp->t_pflags = tp->t_pflags;
148 xfs_trans_dup_dqinfo(tp, ntp);
150 atomic_inc(&tp->t_mountp->m_active_trans);
155 * This is called to reserve free disk blocks and log space for the
156 * given transaction. This must be done before allocating any resources
157 * within the transaction.
159 * This will return ENOSPC if there are not enough blocks available.
160 * It will sleep waiting for available log space.
161 * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
162 * is used by long running transactions. If any one of the reservations
163 * fails then they will all be backed out.
165 * This does not do quota reservations. That typically is done by the
170 struct xfs_trans *tp,
171 struct xfs_trans_res *resp,
176 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
178 /* Mark this thread as being in a transaction */
179 current_set_flags_nested(&tp->t_pflags, PF_FSTRANS);
182 * Attempt to reserve the needed disk blocks by decrementing
183 * the number needed from the number available. This will
184 * fail if the count would go below zero.
187 error = xfs_mod_fdblocks(tp->t_mountp, -((int64_t)blocks), rsvd);
189 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
192 tp->t_blk_res += blocks;
196 * Reserve the log space needed for this transaction.
198 if (resp->tr_logres > 0) {
199 bool permanent = false;
201 ASSERT(tp->t_log_res == 0 ||
202 tp->t_log_res == resp->tr_logres);
203 ASSERT(tp->t_log_count == 0 ||
204 tp->t_log_count == resp->tr_logcount);
206 if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
207 tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
210 ASSERT(tp->t_ticket == NULL);
211 ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
214 if (tp->t_ticket != NULL) {
215 ASSERT(resp->tr_logflags & XFS_TRANS_PERM_LOG_RES);
216 error = xfs_log_regrant(tp->t_mountp, tp->t_ticket);
218 error = xfs_log_reserve(tp->t_mountp,
221 &tp->t_ticket, XFS_TRANSACTION,
222 permanent, tp->t_type);
228 tp->t_log_res = resp->tr_logres;
229 tp->t_log_count = resp->tr_logcount;
233 * Attempt to reserve the needed realtime extents by decrementing
234 * the number needed from the number available. This will
235 * fail if the count would go below zero.
238 error = xfs_mod_frextents(tp->t_mountp, -((int64_t)rtextents));
243 tp->t_rtx_res += rtextents;
249 * Error cases jump to one of these labels to undo any
250 * reservations which have already been performed.
253 if (resp->tr_logres > 0) {
256 if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
257 log_flags = XFS_LOG_REL_PERM_RESERV;
261 xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, log_flags);
264 tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
269 xfs_mod_fdblocks(tp->t_mountp, -((int64_t)blocks), rsvd);
273 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
279 * Record the indicated change to the given field for application
280 * to the file system's superblock when the transaction commits.
281 * For now, just store the change in the transaction structure.
283 * Mark the transaction structure to indicate that the superblock
284 * needs to be updated before committing.
286 * Because we may not be keeping track of allocated/free inodes and
287 * used filesystem blocks in the superblock, we do not mark the
288 * superblock dirty in this transaction if we modify these fields.
289 * We still need to update the transaction deltas so that they get
290 * applied to the incore superblock, but we don't want them to
291 * cause the superblock to get locked and logged if these are the
292 * only fields in the superblock that the transaction modifies.
300 uint32_t flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
301 xfs_mount_t *mp = tp->t_mountp;
304 case XFS_TRANS_SB_ICOUNT:
305 tp->t_icount_delta += delta;
306 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
307 flags &= ~XFS_TRANS_SB_DIRTY;
309 case XFS_TRANS_SB_IFREE:
310 tp->t_ifree_delta += delta;
311 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
312 flags &= ~XFS_TRANS_SB_DIRTY;
314 case XFS_TRANS_SB_FDBLOCKS:
316 * Track the number of blocks allocated in the
317 * transaction. Make sure it does not exceed the
321 tp->t_blk_res_used += (uint)-delta;
322 ASSERT(tp->t_blk_res_used <= tp->t_blk_res);
324 tp->t_fdblocks_delta += delta;
325 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
326 flags &= ~XFS_TRANS_SB_DIRTY;
328 case XFS_TRANS_SB_RES_FDBLOCKS:
330 * The allocation has already been applied to the
331 * in-core superblock's counter. This should only
332 * be applied to the on-disk superblock.
335 tp->t_res_fdblocks_delta += delta;
336 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
337 flags &= ~XFS_TRANS_SB_DIRTY;
339 case XFS_TRANS_SB_FREXTENTS:
341 * Track the number of blocks allocated in the
342 * transaction. Make sure it does not exceed the
346 tp->t_rtx_res_used += (uint)-delta;
347 ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
349 tp->t_frextents_delta += delta;
351 case XFS_TRANS_SB_RES_FREXTENTS:
353 * The allocation has already been applied to the
354 * in-core superblock's counter. This should only
355 * be applied to the on-disk superblock.
358 tp->t_res_frextents_delta += delta;
360 case XFS_TRANS_SB_DBLOCKS:
362 tp->t_dblocks_delta += delta;
364 case XFS_TRANS_SB_AGCOUNT:
366 tp->t_agcount_delta += delta;
368 case XFS_TRANS_SB_IMAXPCT:
369 tp->t_imaxpct_delta += delta;
371 case XFS_TRANS_SB_REXTSIZE:
372 tp->t_rextsize_delta += delta;
374 case XFS_TRANS_SB_RBMBLOCKS:
375 tp->t_rbmblocks_delta += delta;
377 case XFS_TRANS_SB_RBLOCKS:
378 tp->t_rblocks_delta += delta;
380 case XFS_TRANS_SB_REXTENTS:
381 tp->t_rextents_delta += delta;
383 case XFS_TRANS_SB_REXTSLOG:
384 tp->t_rextslog_delta += delta;
391 tp->t_flags |= flags;
395 * xfs_trans_apply_sb_deltas() is called from the commit code
396 * to bring the superblock buffer into the current transaction
397 * and modify it as requested by earlier calls to xfs_trans_mod_sb().
399 * For now we just look at each field allowed to change and change
403 xfs_trans_apply_sb_deltas(
410 bp = xfs_trans_getsb(tp, tp->t_mountp, 0);
411 sbp = XFS_BUF_TO_SBP(bp);
414 * Check that superblock mods match the mods made to AGF counters.
416 ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
417 (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
418 tp->t_ag_btree_delta));
421 * Only update the superblock counters if we are logging them
423 if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
424 if (tp->t_icount_delta)
425 be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
426 if (tp->t_ifree_delta)
427 be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
428 if (tp->t_fdblocks_delta)
429 be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
430 if (tp->t_res_fdblocks_delta)
431 be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
434 if (tp->t_frextents_delta)
435 be64_add_cpu(&sbp->sb_frextents, tp->t_frextents_delta);
436 if (tp->t_res_frextents_delta)
437 be64_add_cpu(&sbp->sb_frextents, tp->t_res_frextents_delta);
439 if (tp->t_dblocks_delta) {
440 be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
443 if (tp->t_agcount_delta) {
444 be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
447 if (tp->t_imaxpct_delta) {
448 sbp->sb_imax_pct += tp->t_imaxpct_delta;
451 if (tp->t_rextsize_delta) {
452 be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
455 if (tp->t_rbmblocks_delta) {
456 be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
459 if (tp->t_rblocks_delta) {
460 be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
463 if (tp->t_rextents_delta) {
464 be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
467 if (tp->t_rextslog_delta) {
468 sbp->sb_rextslog += tp->t_rextslog_delta;
472 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
475 * Log the whole thing, the fields are noncontiguous.
477 xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
480 * Since all the modifiable fields are contiguous, we
481 * can get away with this.
483 xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
484 offsetof(xfs_dsb_t, sb_frextents) +
485 sizeof(sbp->sb_frextents) - 1);
493 int8_t counter = *field;
509 int32_t counter = *field;
525 int64_t counter = *field;
537 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations
538 * and apply superblock counter changes to the in-core superblock. The
539 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
540 * applied to the in-core superblock. The idea is that that has already been
543 * If we are not logging superblock counters, then the inode allocated/free and
544 * used block counts are not updated in the on disk superblock. In this case,
545 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
546 * still need to update the incore superblock with the changes.
549 xfs_trans_unreserve_and_mod_sb(
550 struct xfs_trans *tp)
552 struct xfs_mount *mp = tp->t_mountp;
553 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
554 int64_t blkdelta = 0;
555 int64_t rtxdelta = 0;
557 int64_t ifreedelta = 0;
560 /* calculate deltas */
561 if (tp->t_blk_res > 0)
562 blkdelta = tp->t_blk_res;
563 if ((tp->t_fdblocks_delta != 0) &&
564 (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
565 (tp->t_flags & XFS_TRANS_SB_DIRTY)))
566 blkdelta += tp->t_fdblocks_delta;
568 if (tp->t_rtx_res > 0)
569 rtxdelta = tp->t_rtx_res;
570 if ((tp->t_frextents_delta != 0) &&
571 (tp->t_flags & XFS_TRANS_SB_DIRTY))
572 rtxdelta += tp->t_frextents_delta;
574 if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
575 (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
576 idelta = tp->t_icount_delta;
577 ifreedelta = tp->t_ifree_delta;
580 /* apply the per-cpu counters */
582 error = xfs_mod_fdblocks(mp, blkdelta, rsvd);
588 error = xfs_mod_icount(mp, idelta);
590 goto out_undo_fdblocks;
594 error = xfs_mod_ifree(mp, ifreedelta);
596 goto out_undo_icount;
599 if (rtxdelta == 0 && !(tp->t_flags & XFS_TRANS_SB_DIRTY))
602 /* apply remaining deltas */
603 spin_lock(&mp->m_sb_lock);
605 error = xfs_sb_mod64(&mp->m_sb.sb_frextents, rtxdelta);
610 if (tp->t_dblocks_delta != 0) {
611 error = xfs_sb_mod64(&mp->m_sb.sb_dblocks, tp->t_dblocks_delta);
613 goto out_undo_frextents;
615 if (tp->t_agcount_delta != 0) {
616 error = xfs_sb_mod32(&mp->m_sb.sb_agcount, tp->t_agcount_delta);
618 goto out_undo_dblocks;
620 if (tp->t_imaxpct_delta != 0) {
621 error = xfs_sb_mod8(&mp->m_sb.sb_imax_pct, tp->t_imaxpct_delta);
623 goto out_undo_agcount;
625 if (tp->t_rextsize_delta != 0) {
626 error = xfs_sb_mod32(&mp->m_sb.sb_rextsize,
627 tp->t_rextsize_delta);
629 goto out_undo_imaxpct;
631 if (tp->t_rbmblocks_delta != 0) {
632 error = xfs_sb_mod32(&mp->m_sb.sb_rbmblocks,
633 tp->t_rbmblocks_delta);
635 goto out_undo_rextsize;
637 if (tp->t_rblocks_delta != 0) {
638 error = xfs_sb_mod64(&mp->m_sb.sb_rblocks, tp->t_rblocks_delta);
640 goto out_undo_rbmblocks;
642 if (tp->t_rextents_delta != 0) {
643 error = xfs_sb_mod64(&mp->m_sb.sb_rextents,
644 tp->t_rextents_delta);
646 goto out_undo_rblocks;
648 if (tp->t_rextslog_delta != 0) {
649 error = xfs_sb_mod8(&mp->m_sb.sb_rextslog,
650 tp->t_rextslog_delta);
652 goto out_undo_rextents;
654 spin_unlock(&mp->m_sb_lock);
658 if (tp->t_rextents_delta)
659 xfs_sb_mod64(&mp->m_sb.sb_rextents, -tp->t_rextents_delta);
661 if (tp->t_rblocks_delta)
662 xfs_sb_mod64(&mp->m_sb.sb_rblocks, -tp->t_rblocks_delta);
664 if (tp->t_rbmblocks_delta)
665 xfs_sb_mod32(&mp->m_sb.sb_rbmblocks, -tp->t_rbmblocks_delta);
667 if (tp->t_rextsize_delta)
668 xfs_sb_mod32(&mp->m_sb.sb_rextsize, -tp->t_rextsize_delta);
670 if (tp->t_rextsize_delta)
671 xfs_sb_mod8(&mp->m_sb.sb_imax_pct, -tp->t_imaxpct_delta);
673 if (tp->t_agcount_delta)
674 xfs_sb_mod32(&mp->m_sb.sb_agcount, -tp->t_agcount_delta);
676 if (tp->t_dblocks_delta)
677 xfs_sb_mod64(&mp->m_sb.sb_dblocks, -tp->t_dblocks_delta);
680 xfs_sb_mod64(&mp->m_sb.sb_frextents, -rtxdelta);
682 spin_unlock(&mp->m_sb_lock);
684 xfs_mod_ifree(mp, -ifreedelta);
687 xfs_mod_icount(mp, -idelta);
690 xfs_mod_fdblocks(mp, -blkdelta, rsvd);
697 * Add the given log item to the transaction's list of log items.
699 * The log item will now point to its new descriptor with its li_desc field.
703 struct xfs_trans *tp,
704 struct xfs_log_item *lip)
706 struct xfs_log_item_desc *lidp;
708 ASSERT(lip->li_mountp == tp->t_mountp);
709 ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
711 lidp = kmem_zone_zalloc(xfs_log_item_desc_zone, KM_SLEEP | KM_NOFS);
713 lidp->lid_item = lip;
715 list_add_tail(&lidp->lid_trans, &tp->t_items);
721 xfs_trans_free_item_desc(
722 struct xfs_log_item_desc *lidp)
724 list_del_init(&lidp->lid_trans);
725 kmem_zone_free(xfs_log_item_desc_zone, lidp);
729 * Unlink and free the given descriptor.
733 struct xfs_log_item *lip)
735 xfs_trans_free_item_desc(lip->li_desc);
740 * Unlock all of the items of a transaction and free all the descriptors
741 * of that transaction.
744 xfs_trans_free_items(
745 struct xfs_trans *tp,
746 xfs_lsn_t commit_lsn,
749 struct xfs_log_item_desc *lidp, *next;
751 list_for_each_entry_safe(lidp, next, &tp->t_items, lid_trans) {
752 struct xfs_log_item *lip = lidp->lid_item;
756 if (commit_lsn != NULLCOMMITLSN)
757 lip->li_ops->iop_committing(lip, commit_lsn);
758 if (flags & XFS_TRANS_ABORT)
759 lip->li_flags |= XFS_LI_ABORTED;
760 lip->li_ops->iop_unlock(lip);
762 xfs_trans_free_item_desc(lidp);
767 xfs_log_item_batch_insert(
768 struct xfs_ail *ailp,
769 struct xfs_ail_cursor *cur,
770 struct xfs_log_item **log_items,
772 xfs_lsn_t commit_lsn)
776 spin_lock(&ailp->xa_lock);
777 /* xfs_trans_ail_update_bulk drops ailp->xa_lock */
778 xfs_trans_ail_update_bulk(ailp, cur, log_items, nr_items, commit_lsn);
780 for (i = 0; i < nr_items; i++) {
781 struct xfs_log_item *lip = log_items[i];
783 lip->li_ops->iop_unpin(lip, 0);
788 * Bulk operation version of xfs_trans_committed that takes a log vector of
789 * items to insert into the AIL. This uses bulk AIL insertion techniques to
790 * minimise lock traffic.
792 * If we are called with the aborted flag set, it is because a log write during
793 * a CIL checkpoint commit has failed. In this case, all the items in the
794 * checkpoint have already gone through iop_commited and iop_unlock, which
795 * means that checkpoint commit abort handling is treated exactly the same
796 * as an iclog write error even though we haven't started any IO yet. Hence in
797 * this case all we need to do is iop_committed processing, followed by an
798 * iop_unpin(aborted) call.
800 * The AIL cursor is used to optimise the insert process. If commit_lsn is not
801 * at the end of the AIL, the insert cursor avoids the need to walk
802 * the AIL to find the insertion point on every xfs_log_item_batch_insert()
803 * call. This saves a lot of needless list walking and is a net win, even
804 * though it slightly increases that amount of AIL lock traffic to set it up
808 xfs_trans_committed_bulk(
809 struct xfs_ail *ailp,
810 struct xfs_log_vec *log_vector,
811 xfs_lsn_t commit_lsn,
814 #define LOG_ITEM_BATCH_SIZE 32
815 struct xfs_log_item *log_items[LOG_ITEM_BATCH_SIZE];
816 struct xfs_log_vec *lv;
817 struct xfs_ail_cursor cur;
820 spin_lock(&ailp->xa_lock);
821 xfs_trans_ail_cursor_last(ailp, &cur, commit_lsn);
822 spin_unlock(&ailp->xa_lock);
824 /* unpin all the log items */
825 for (lv = log_vector; lv; lv = lv->lv_next ) {
826 struct xfs_log_item *lip = lv->lv_item;
830 lip->li_flags |= XFS_LI_ABORTED;
831 item_lsn = lip->li_ops->iop_committed(lip, commit_lsn);
833 /* item_lsn of -1 means the item needs no further processing */
834 if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
838 * if we are aborting the operation, no point in inserting the
839 * object into the AIL as we are in a shutdown situation.
842 ASSERT(XFS_FORCED_SHUTDOWN(ailp->xa_mount));
843 lip->li_ops->iop_unpin(lip, 1);
847 if (item_lsn != commit_lsn) {
850 * Not a bulk update option due to unusual item_lsn.
851 * Push into AIL immediately, rechecking the lsn once
852 * we have the ail lock. Then unpin the item. This does
853 * not affect the AIL cursor the bulk insert path is
856 spin_lock(&ailp->xa_lock);
857 if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0)
858 xfs_trans_ail_update(ailp, lip, item_lsn);
860 spin_unlock(&ailp->xa_lock);
861 lip->li_ops->iop_unpin(lip, 0);
865 /* Item is a candidate for bulk AIL insert. */
866 log_items[i++] = lv->lv_item;
867 if (i >= LOG_ITEM_BATCH_SIZE) {
868 xfs_log_item_batch_insert(ailp, &cur, log_items,
869 LOG_ITEM_BATCH_SIZE, commit_lsn);
874 /* make sure we insert the remainder! */
876 xfs_log_item_batch_insert(ailp, &cur, log_items, i, commit_lsn);
878 spin_lock(&ailp->xa_lock);
879 xfs_trans_ail_cursor_done(&cur);
880 spin_unlock(&ailp->xa_lock);
884 * Commit the given transaction to the log.
886 * XFS disk error handling mechanism is not based on a typical
887 * transaction abort mechanism. Logically after the filesystem
888 * gets marked 'SHUTDOWN', we can't let any new transactions
889 * be durable - ie. committed to disk - because some metadata might
890 * be inconsistent. In such cases, this returns an error, and the
891 * caller may assume that all locked objects joined to the transaction
892 * have already been unlocked as if the commit had succeeded.
893 * Do not reference the transaction structure after this call.
897 struct xfs_trans *tp,
900 struct xfs_mount *mp = tp->t_mountp;
901 xfs_lsn_t commit_lsn = -1;
904 int sync = tp->t_flags & XFS_TRANS_SYNC;
907 * Determine whether this commit is releasing a permanent
908 * log reservation or not.
910 if (flags & XFS_TRANS_RELEASE_LOG_RES) {
911 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
912 log_flags = XFS_LOG_REL_PERM_RESERV;
916 * If there is nothing to be logged by the transaction,
917 * then unlock all of the items associated with the
918 * transaction and free the transaction structure.
919 * Also make sure to return any reserved blocks to
922 if (!(tp->t_flags & XFS_TRANS_DIRTY))
925 if (XFS_FORCED_SHUTDOWN(mp)) {
930 ASSERT(tp->t_ticket != NULL);
933 * If we need to update the superblock, then do it now.
935 if (tp->t_flags & XFS_TRANS_SB_DIRTY)
936 xfs_trans_apply_sb_deltas(tp);
937 xfs_trans_apply_dquot_deltas(tp);
939 xfs_log_commit_cil(mp, tp, &commit_lsn, flags);
941 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
945 * If the transaction needs to be synchronous, then force the
946 * log out now and wait for it.
949 error = _xfs_log_force_lsn(mp, commit_lsn, XFS_LOG_SYNC, NULL);
950 XFS_STATS_INC(xs_trans_sync);
952 XFS_STATS_INC(xs_trans_async);
958 xfs_trans_unreserve_and_mod_sb(tp);
961 * It is indeed possible for the transaction to be not dirty but
962 * the dqinfo portion to be. All that means is that we have some
963 * (non-persistent) quota reservations that need to be unreserved.
965 xfs_trans_unreserve_and_mod_dquots(tp);
967 commit_lsn = xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
968 if (commit_lsn == -1 && !error)
971 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
972 xfs_trans_free_items(tp, NULLCOMMITLSN, error ? XFS_TRANS_ABORT : 0);
975 XFS_STATS_INC(xs_trans_empty);
980 * Unlock all of the transaction's items and free the transaction.
981 * The transaction must not have modified any of its items, because
982 * there is no way to restore them to their previous state.
984 * If the transaction has made a log reservation, make sure to release
993 xfs_mount_t *mp = tp->t_mountp;
996 * See if the caller is being too lazy to figure out if
997 * the transaction really needs an abort.
999 if ((flags & XFS_TRANS_ABORT) && !(tp->t_flags & XFS_TRANS_DIRTY))
1000 flags &= ~XFS_TRANS_ABORT;
1002 * See if the caller is relying on us to shut down the
1003 * filesystem. This happens in paths where we detect
1004 * corruption and decide to give up.
1006 if ((tp->t_flags & XFS_TRANS_DIRTY) && !XFS_FORCED_SHUTDOWN(mp)) {
1007 XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
1008 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1011 if (!(flags & XFS_TRANS_ABORT) && !XFS_FORCED_SHUTDOWN(mp)) {
1012 struct xfs_log_item_desc *lidp;
1014 list_for_each_entry(lidp, &tp->t_items, lid_trans)
1015 ASSERT(!(lidp->lid_item->li_type == XFS_LI_EFD));
1018 xfs_trans_unreserve_and_mod_sb(tp);
1019 xfs_trans_unreserve_and_mod_dquots(tp);
1022 if (flags & XFS_TRANS_RELEASE_LOG_RES) {
1023 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
1024 log_flags = XFS_LOG_REL_PERM_RESERV;
1028 xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
1031 /* mark this thread as no longer being in a transaction */
1032 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
1034 xfs_trans_free_items(tp, NULLCOMMITLSN, flags);
1039 * Roll from one trans in the sequence of PERMANENT transactions to
1040 * the next: permanent transactions are only flushed out when
1041 * committed with XFS_TRANS_RELEASE_LOG_RES, but we still want as soon
1042 * as possible to let chunks of it go to the log. So we commit the
1043 * chunk we've been working on and get a new transaction to continue.
1047 struct xfs_trans **tpp,
1048 struct xfs_inode *dp)
1050 struct xfs_trans *trans;
1051 struct xfs_trans_res tres;
1055 * Ensure that the inode is always logged.
1058 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
1061 * Copy the critical parameters from one trans to the next.
1063 tres.tr_logres = trans->t_log_res;
1064 tres.tr_logcount = trans->t_log_count;
1065 *tpp = xfs_trans_dup(trans);
1068 * Commit the current transaction.
1069 * If this commit failed, then it'd just unlock those items that
1070 * are not marked ihold. That also means that a filesystem shutdown
1071 * is in progress. The caller takes the responsibility to cancel
1072 * the duplicate transaction that gets returned.
1074 error = xfs_trans_commit(trans, 0);
1081 * transaction commit worked ok so we can drop the extra ticket
1082 * reference that we gained in xfs_trans_dup()
1084 xfs_log_ticket_put(trans->t_ticket);
1088 * Reserve space in the log for th next transaction.
1089 * This also pushes items in the "AIL", the list of logged items,
1090 * out to disk if they are taking up space at the tail of the log
1091 * that we want to use. This requires that either nothing be locked
1092 * across this call, or that anything that is locked be logged in
1093 * the prior and the next transactions.
1095 tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
1096 error = xfs_trans_reserve(trans, &tres, 0, 0);
1098 * Ensure that the inode is in the new transaction and locked.
1103 xfs_trans_ijoin(trans, dp, 0);