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"
27 #include "xfs_mount.h"
28 #include "xfs_inode.h"
29 #include "xfs_extent_busy.h"
30 #include "xfs_quota.h"
31 #include "xfs_trans.h"
32 #include "xfs_trans_priv.h"
34 #include "xfs_trace.h"
35 #include "xfs_error.h"
37 kmem_zone_t *xfs_trans_zone;
38 kmem_zone_t *xfs_log_item_desc_zone;
41 * Initialize the precomputed transaction reservation values
42 * in the mount structure.
48 xfs_trans_resv_calc(mp, M_RES(mp));
52 * This routine is called to allocate a transaction structure.
53 * The type parameter indicates the type of the transaction. These
54 * are enumerated in xfs_trans.h.
56 * Dynamically allocate the transaction structure from the transaction
57 * zone, initialize it, and return it to the caller.
66 sb_start_intwrite(mp->m_super);
67 tp = _xfs_trans_alloc(mp, type, KM_SLEEP);
68 tp->t_flags |= XFS_TRANS_FREEZE_PROT;
76 xfs_km_flags_t memflags)
80 WARN_ON(mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
81 atomic_inc(&mp->m_active_trans);
83 tp = kmem_zone_zalloc(xfs_trans_zone, memflags);
84 tp->t_magic = XFS_TRANS_HEADER_MAGIC;
87 INIT_LIST_HEAD(&tp->t_items);
88 INIT_LIST_HEAD(&tp->t_busy);
93 * Free the transaction structure. If there is more clean up
94 * to do when the structure is freed, add it here.
100 xfs_extent_busy_sort(&tp->t_busy);
101 xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false);
103 atomic_dec(&tp->t_mountp->m_active_trans);
104 if (tp->t_flags & XFS_TRANS_FREEZE_PROT)
105 sb_end_intwrite(tp->t_mountp->m_super);
106 xfs_trans_free_dqinfo(tp);
107 kmem_zone_free(xfs_trans_zone, tp);
111 * This is called to create a new transaction which will share the
112 * permanent log reservation of the given transaction. The remaining
113 * unused block and rt extent reservations are also inherited. This
114 * implies that the original transaction is no longer allowed to allocate
115 * blocks. Locks and log items, however, are no inherited. They must
116 * be added to the new transaction explicitly.
124 ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
127 * Initialize the new transaction structure.
129 ntp->t_magic = XFS_TRANS_HEADER_MAGIC;
130 ntp->t_type = tp->t_type;
131 ntp->t_mountp = tp->t_mountp;
132 INIT_LIST_HEAD(&ntp->t_items);
133 INIT_LIST_HEAD(&ntp->t_busy);
135 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
136 ASSERT(tp->t_ticket != NULL);
138 ntp->t_flags = XFS_TRANS_PERM_LOG_RES |
139 (tp->t_flags & XFS_TRANS_RESERVE) |
140 (tp->t_flags & XFS_TRANS_FREEZE_PROT);
141 /* We gave our writer reference to the new transaction */
142 tp->t_flags &= ~XFS_TRANS_FREEZE_PROT;
143 ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
144 ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
145 tp->t_blk_res = tp->t_blk_res_used;
146 ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
147 tp->t_rtx_res = tp->t_rtx_res_used;
148 ntp->t_pflags = tp->t_pflags;
150 xfs_trans_dup_dqinfo(tp, ntp);
152 atomic_inc(&tp->t_mountp->m_active_trans);
157 * This is called to reserve free disk blocks and log space for the
158 * given transaction. This must be done before allocating any resources
159 * within the transaction.
161 * This will return ENOSPC if there are not enough blocks available.
162 * It will sleep waiting for available log space.
163 * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
164 * is used by long running transactions. If any one of the reservations
165 * fails then they will all be backed out.
167 * This does not do quota reservations. That typically is done by the
172 struct xfs_trans *tp,
173 struct xfs_trans_res *resp,
178 int rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
180 /* Mark this thread as being in a transaction */
181 current_set_flags_nested(&tp->t_pflags, PF_FSTRANS);
184 * Attempt to reserve the needed disk blocks by decrementing
185 * the number needed from the number available. This will
186 * fail if the count would go below zero.
189 error = xfs_icsb_modify_counters(tp->t_mountp, XFS_SBS_FDBLOCKS,
190 -((int64_t)blocks), rsvd);
192 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
195 tp->t_blk_res += blocks;
199 * Reserve the log space needed for this transaction.
201 if (resp->tr_logres > 0) {
202 bool permanent = false;
204 ASSERT(tp->t_log_res == 0 ||
205 tp->t_log_res == resp->tr_logres);
206 ASSERT(tp->t_log_count == 0 ||
207 tp->t_log_count == resp->tr_logcount);
209 if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
210 tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
213 ASSERT(tp->t_ticket == NULL);
214 ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
217 if (tp->t_ticket != NULL) {
218 ASSERT(resp->tr_logflags & XFS_TRANS_PERM_LOG_RES);
219 error = xfs_log_regrant(tp->t_mountp, tp->t_ticket);
221 error = xfs_log_reserve(tp->t_mountp,
224 &tp->t_ticket, XFS_TRANSACTION,
225 permanent, tp->t_type);
231 tp->t_log_res = resp->tr_logres;
232 tp->t_log_count = resp->tr_logcount;
236 * Attempt to reserve the needed realtime extents by decrementing
237 * the number needed from the number available. This will
238 * fail if the count would go below zero.
241 error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FREXTENTS,
242 -((int64_t)rtextents), rsvd);
247 tp->t_rtx_res += rtextents;
253 * Error cases jump to one of these labels to undo any
254 * reservations which have already been performed.
257 if (resp->tr_logres > 0) {
260 if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
261 log_flags = XFS_LOG_REL_PERM_RESERV;
265 xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, log_flags);
268 tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
273 xfs_icsb_modify_counters(tp->t_mountp, XFS_SBS_FDBLOCKS,
274 (int64_t)blocks, rsvd);
278 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
284 * Record the indicated change to the given field for application
285 * to the file system's superblock when the transaction commits.
286 * For now, just store the change in the transaction structure.
288 * Mark the transaction structure to indicate that the superblock
289 * needs to be updated before committing.
291 * Because we may not be keeping track of allocated/free inodes and
292 * used filesystem blocks in the superblock, we do not mark the
293 * superblock dirty in this transaction if we modify these fields.
294 * We still need to update the transaction deltas so that they get
295 * applied to the incore superblock, but we don't want them to
296 * cause the superblock to get locked and logged if these are the
297 * only fields in the superblock that the transaction modifies.
305 uint32_t flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
306 xfs_mount_t *mp = tp->t_mountp;
309 case XFS_TRANS_SB_ICOUNT:
310 tp->t_icount_delta += delta;
311 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
312 flags &= ~XFS_TRANS_SB_DIRTY;
314 case XFS_TRANS_SB_IFREE:
315 tp->t_ifree_delta += delta;
316 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
317 flags &= ~XFS_TRANS_SB_DIRTY;
319 case XFS_TRANS_SB_FDBLOCKS:
321 * Track the number of blocks allocated in the
322 * transaction. Make sure it does not exceed the
326 tp->t_blk_res_used += (uint)-delta;
327 ASSERT(tp->t_blk_res_used <= tp->t_blk_res);
329 tp->t_fdblocks_delta += delta;
330 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
331 flags &= ~XFS_TRANS_SB_DIRTY;
333 case XFS_TRANS_SB_RES_FDBLOCKS:
335 * The allocation has already been applied to the
336 * in-core superblock's counter. This should only
337 * be applied to the on-disk superblock.
340 tp->t_res_fdblocks_delta += delta;
341 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
342 flags &= ~XFS_TRANS_SB_DIRTY;
344 case XFS_TRANS_SB_FREXTENTS:
346 * Track the number of blocks allocated in the
347 * transaction. Make sure it does not exceed the
351 tp->t_rtx_res_used += (uint)-delta;
352 ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
354 tp->t_frextents_delta += delta;
356 case XFS_TRANS_SB_RES_FREXTENTS:
358 * The allocation has already been applied to the
359 * in-core superblock's counter. This should only
360 * be applied to the on-disk superblock.
363 tp->t_res_frextents_delta += delta;
365 case XFS_TRANS_SB_DBLOCKS:
367 tp->t_dblocks_delta += delta;
369 case XFS_TRANS_SB_AGCOUNT:
371 tp->t_agcount_delta += delta;
373 case XFS_TRANS_SB_IMAXPCT:
374 tp->t_imaxpct_delta += delta;
376 case XFS_TRANS_SB_REXTSIZE:
377 tp->t_rextsize_delta += delta;
379 case XFS_TRANS_SB_RBMBLOCKS:
380 tp->t_rbmblocks_delta += delta;
382 case XFS_TRANS_SB_RBLOCKS:
383 tp->t_rblocks_delta += delta;
385 case XFS_TRANS_SB_REXTENTS:
386 tp->t_rextents_delta += delta;
388 case XFS_TRANS_SB_REXTSLOG:
389 tp->t_rextslog_delta += delta;
396 tp->t_flags |= flags;
400 * xfs_trans_apply_sb_deltas() is called from the commit code
401 * to bring the superblock buffer into the current transaction
402 * and modify it as requested by earlier calls to xfs_trans_mod_sb().
404 * For now we just look at each field allowed to change and change
408 xfs_trans_apply_sb_deltas(
415 bp = xfs_trans_getsb(tp, tp->t_mountp, 0);
416 sbp = XFS_BUF_TO_SBP(bp);
419 * Check that superblock mods match the mods made to AGF counters.
421 ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
422 (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
423 tp->t_ag_btree_delta));
426 * Only update the superblock counters if we are logging them
428 if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
429 if (tp->t_icount_delta)
430 be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
431 if (tp->t_ifree_delta)
432 be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
433 if (tp->t_fdblocks_delta)
434 be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
435 if (tp->t_res_fdblocks_delta)
436 be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
439 if (tp->t_frextents_delta)
440 be64_add_cpu(&sbp->sb_frextents, tp->t_frextents_delta);
441 if (tp->t_res_frextents_delta)
442 be64_add_cpu(&sbp->sb_frextents, tp->t_res_frextents_delta);
444 if (tp->t_dblocks_delta) {
445 be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
448 if (tp->t_agcount_delta) {
449 be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
452 if (tp->t_imaxpct_delta) {
453 sbp->sb_imax_pct += tp->t_imaxpct_delta;
456 if (tp->t_rextsize_delta) {
457 be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
460 if (tp->t_rbmblocks_delta) {
461 be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
464 if (tp->t_rblocks_delta) {
465 be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
468 if (tp->t_rextents_delta) {
469 be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
472 if (tp->t_rextslog_delta) {
473 sbp->sb_rextslog += tp->t_rextslog_delta;
479 * Log the whole thing, the fields are noncontiguous.
481 xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
484 * Since all the modifiable fields are contiguous, we
485 * can get away with this.
487 xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
488 offsetof(xfs_dsb_t, sb_frextents) +
489 sizeof(sbp->sb_frextents) - 1);
493 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations
494 * and apply superblock counter changes to the in-core superblock. The
495 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
496 * applied to the in-core superblock. The idea is that that has already been
499 * This is done efficiently with a single call to xfs_mod_incore_sb_batch().
500 * However, we have to ensure that we only modify each superblock field only
501 * once because the application of the delta values may not be atomic. That can
502 * lead to ENOSPC races occurring if we have two separate modifcations of the
503 * free space counter to put back the entire reservation and then take away
506 * If we are not logging superblock counters, then the inode allocated/free and
507 * used block counts are not updated in the on disk superblock. In this case,
508 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
509 * still need to update the incore superblock with the changes.
512 xfs_trans_unreserve_and_mod_sb(
515 xfs_mod_sb_t msb[9]; /* If you add cases, add entries */
517 xfs_mount_t *mp = tp->t_mountp;
521 int64_t blkdelta = 0;
522 int64_t rtxdelta = 0;
524 int64_t ifreedelta = 0;
527 rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
529 /* calculate deltas */
530 if (tp->t_blk_res > 0)
531 blkdelta = tp->t_blk_res;
532 if ((tp->t_fdblocks_delta != 0) &&
533 (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
534 (tp->t_flags & XFS_TRANS_SB_DIRTY)))
535 blkdelta += tp->t_fdblocks_delta;
537 if (tp->t_rtx_res > 0)
538 rtxdelta = tp->t_rtx_res;
539 if ((tp->t_frextents_delta != 0) &&
540 (tp->t_flags & XFS_TRANS_SB_DIRTY))
541 rtxdelta += tp->t_frextents_delta;
543 if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
544 (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
545 idelta = tp->t_icount_delta;
546 ifreedelta = tp->t_ifree_delta;
549 /* apply the per-cpu counters */
551 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
558 error = xfs_icsb_modify_counters(mp, XFS_SBS_ICOUNT,
561 goto out_undo_fdblocks;
565 error = xfs_icsb_modify_counters(mp, XFS_SBS_IFREE,
568 goto out_undo_icount;
571 /* apply remaining deltas */
573 msbp->msb_field = XFS_SBS_FREXTENTS;
574 msbp->msb_delta = rtxdelta;
578 if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
579 if (tp->t_dblocks_delta != 0) {
580 msbp->msb_field = XFS_SBS_DBLOCKS;
581 msbp->msb_delta = tp->t_dblocks_delta;
584 if (tp->t_agcount_delta != 0) {
585 msbp->msb_field = XFS_SBS_AGCOUNT;
586 msbp->msb_delta = tp->t_agcount_delta;
589 if (tp->t_imaxpct_delta != 0) {
590 msbp->msb_field = XFS_SBS_IMAX_PCT;
591 msbp->msb_delta = tp->t_imaxpct_delta;
594 if (tp->t_rextsize_delta != 0) {
595 msbp->msb_field = XFS_SBS_REXTSIZE;
596 msbp->msb_delta = tp->t_rextsize_delta;
599 if (tp->t_rbmblocks_delta != 0) {
600 msbp->msb_field = XFS_SBS_RBMBLOCKS;
601 msbp->msb_delta = tp->t_rbmblocks_delta;
604 if (tp->t_rblocks_delta != 0) {
605 msbp->msb_field = XFS_SBS_RBLOCKS;
606 msbp->msb_delta = tp->t_rblocks_delta;
609 if (tp->t_rextents_delta != 0) {
610 msbp->msb_field = XFS_SBS_REXTENTS;
611 msbp->msb_delta = tp->t_rextents_delta;
614 if (tp->t_rextslog_delta != 0) {
615 msbp->msb_field = XFS_SBS_REXTSLOG;
616 msbp->msb_delta = tp->t_rextslog_delta;
622 * If we need to change anything, do it.
625 error = xfs_mod_incore_sb_batch(tp->t_mountp, msb,
626 (uint)(msbp - msb), rsvd);
628 goto out_undo_ifreecount;
635 xfs_icsb_modify_counters(mp, XFS_SBS_IFREE, -ifreedelta, rsvd);
638 xfs_icsb_modify_counters(mp, XFS_SBS_ICOUNT, -idelta, rsvd);
641 xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS, -blkdelta, rsvd);
648 * Add the given log item to the transaction's list of log items.
650 * The log item will now point to its new descriptor with its li_desc field.
654 struct xfs_trans *tp,
655 struct xfs_log_item *lip)
657 struct xfs_log_item_desc *lidp;
659 ASSERT(lip->li_mountp == tp->t_mountp);
660 ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
662 lidp = kmem_zone_zalloc(xfs_log_item_desc_zone, KM_SLEEP | KM_NOFS);
664 lidp->lid_item = lip;
666 list_add_tail(&lidp->lid_trans, &tp->t_items);
672 xfs_trans_free_item_desc(
673 struct xfs_log_item_desc *lidp)
675 list_del_init(&lidp->lid_trans);
676 kmem_zone_free(xfs_log_item_desc_zone, lidp);
680 * Unlink and free the given descriptor.
684 struct xfs_log_item *lip)
686 xfs_trans_free_item_desc(lip->li_desc);
691 * Unlock all of the items of a transaction and free all the descriptors
692 * of that transaction.
695 xfs_trans_free_items(
696 struct xfs_trans *tp,
697 xfs_lsn_t commit_lsn,
700 struct xfs_log_item_desc *lidp, *next;
702 list_for_each_entry_safe(lidp, next, &tp->t_items, lid_trans) {
703 struct xfs_log_item *lip = lidp->lid_item;
707 if (commit_lsn != NULLCOMMITLSN)
708 lip->li_ops->iop_committing(lip, commit_lsn);
709 if (flags & XFS_TRANS_ABORT)
710 lip->li_flags |= XFS_LI_ABORTED;
711 lip->li_ops->iop_unlock(lip);
713 xfs_trans_free_item_desc(lidp);
718 xfs_log_item_batch_insert(
719 struct xfs_ail *ailp,
720 struct xfs_ail_cursor *cur,
721 struct xfs_log_item **log_items,
723 xfs_lsn_t commit_lsn)
727 spin_lock(&ailp->xa_lock);
728 /* xfs_trans_ail_update_bulk drops ailp->xa_lock */
729 xfs_trans_ail_update_bulk(ailp, cur, log_items, nr_items, commit_lsn);
731 for (i = 0; i < nr_items; i++) {
732 struct xfs_log_item *lip = log_items[i];
734 lip->li_ops->iop_unpin(lip, 0);
739 * Bulk operation version of xfs_trans_committed that takes a log vector of
740 * items to insert into the AIL. This uses bulk AIL insertion techniques to
741 * minimise lock traffic.
743 * If we are called with the aborted flag set, it is because a log write during
744 * a CIL checkpoint commit has failed. In this case, all the items in the
745 * checkpoint have already gone through iop_commited and iop_unlock, which
746 * means that checkpoint commit abort handling is treated exactly the same
747 * as an iclog write error even though we haven't started any IO yet. Hence in
748 * this case all we need to do is iop_committed processing, followed by an
749 * iop_unpin(aborted) call.
751 * The AIL cursor is used to optimise the insert process. If commit_lsn is not
752 * at the end of the AIL, the insert cursor avoids the need to walk
753 * the AIL to find the insertion point on every xfs_log_item_batch_insert()
754 * call. This saves a lot of needless list walking and is a net win, even
755 * though it slightly increases that amount of AIL lock traffic to set it up
759 xfs_trans_committed_bulk(
760 struct xfs_ail *ailp,
761 struct xfs_log_vec *log_vector,
762 xfs_lsn_t commit_lsn,
765 #define LOG_ITEM_BATCH_SIZE 32
766 struct xfs_log_item *log_items[LOG_ITEM_BATCH_SIZE];
767 struct xfs_log_vec *lv;
768 struct xfs_ail_cursor cur;
771 spin_lock(&ailp->xa_lock);
772 xfs_trans_ail_cursor_last(ailp, &cur, commit_lsn);
773 spin_unlock(&ailp->xa_lock);
775 /* unpin all the log items */
776 for (lv = log_vector; lv; lv = lv->lv_next ) {
777 struct xfs_log_item *lip = lv->lv_item;
781 lip->li_flags |= XFS_LI_ABORTED;
782 item_lsn = lip->li_ops->iop_committed(lip, commit_lsn);
784 /* item_lsn of -1 means the item needs no further processing */
785 if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
789 * if we are aborting the operation, no point in inserting the
790 * object into the AIL as we are in a shutdown situation.
793 ASSERT(XFS_FORCED_SHUTDOWN(ailp->xa_mount));
794 lip->li_ops->iop_unpin(lip, 1);
798 if (item_lsn != commit_lsn) {
801 * Not a bulk update option due to unusual item_lsn.
802 * Push into AIL immediately, rechecking the lsn once
803 * we have the ail lock. Then unpin the item. This does
804 * not affect the AIL cursor the bulk insert path is
807 spin_lock(&ailp->xa_lock);
808 if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0)
809 xfs_trans_ail_update(ailp, lip, item_lsn);
811 spin_unlock(&ailp->xa_lock);
812 lip->li_ops->iop_unpin(lip, 0);
816 /* Item is a candidate for bulk AIL insert. */
817 log_items[i++] = lv->lv_item;
818 if (i >= LOG_ITEM_BATCH_SIZE) {
819 xfs_log_item_batch_insert(ailp, &cur, log_items,
820 LOG_ITEM_BATCH_SIZE, commit_lsn);
825 /* make sure we insert the remainder! */
827 xfs_log_item_batch_insert(ailp, &cur, log_items, i, commit_lsn);
829 spin_lock(&ailp->xa_lock);
830 xfs_trans_ail_cursor_done(&cur);
831 spin_unlock(&ailp->xa_lock);
835 * Commit the given transaction to the log.
837 * XFS disk error handling mechanism is not based on a typical
838 * transaction abort mechanism. Logically after the filesystem
839 * gets marked 'SHUTDOWN', we can't let any new transactions
840 * be durable - ie. committed to disk - because some metadata might
841 * be inconsistent. In such cases, this returns an error, and the
842 * caller may assume that all locked objects joined to the transaction
843 * have already been unlocked as if the commit had succeeded.
844 * Do not reference the transaction structure after this call.
848 struct xfs_trans *tp,
851 struct xfs_mount *mp = tp->t_mountp;
852 xfs_lsn_t commit_lsn = -1;
855 int sync = tp->t_flags & XFS_TRANS_SYNC;
858 * Determine whether this commit is releasing a permanent
859 * log reservation or not.
861 if (flags & XFS_TRANS_RELEASE_LOG_RES) {
862 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
863 log_flags = XFS_LOG_REL_PERM_RESERV;
867 * If there is nothing to be logged by the transaction,
868 * then unlock all of the items associated with the
869 * transaction and free the transaction structure.
870 * Also make sure to return any reserved blocks to
873 if (!(tp->t_flags & XFS_TRANS_DIRTY))
876 if (XFS_FORCED_SHUTDOWN(mp)) {
881 ASSERT(tp->t_ticket != NULL);
884 * If we need to update the superblock, then do it now.
886 if (tp->t_flags & XFS_TRANS_SB_DIRTY)
887 xfs_trans_apply_sb_deltas(tp);
888 xfs_trans_apply_dquot_deltas(tp);
890 xfs_log_commit_cil(mp, tp, &commit_lsn, flags);
892 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
896 * If the transaction needs to be synchronous, then force the
897 * log out now and wait for it.
900 error = _xfs_log_force_lsn(mp, commit_lsn, XFS_LOG_SYNC, NULL);
901 XFS_STATS_INC(xs_trans_sync);
903 XFS_STATS_INC(xs_trans_async);
909 xfs_trans_unreserve_and_mod_sb(tp);
912 * It is indeed possible for the transaction to be not dirty but
913 * the dqinfo portion to be. All that means is that we have some
914 * (non-persistent) quota reservations that need to be unreserved.
916 xfs_trans_unreserve_and_mod_dquots(tp);
918 commit_lsn = xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
919 if (commit_lsn == -1 && !error)
922 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
923 xfs_trans_free_items(tp, NULLCOMMITLSN, error ? XFS_TRANS_ABORT : 0);
926 XFS_STATS_INC(xs_trans_empty);
931 * Unlock all of the transaction's items and free the transaction.
932 * The transaction must not have modified any of its items, because
933 * there is no way to restore them to their previous state.
935 * If the transaction has made a log reservation, make sure to release
944 xfs_mount_t *mp = tp->t_mountp;
947 * See if the caller is being too lazy to figure out if
948 * the transaction really needs an abort.
950 if ((flags & XFS_TRANS_ABORT) && !(tp->t_flags & XFS_TRANS_DIRTY))
951 flags &= ~XFS_TRANS_ABORT;
953 * See if the caller is relying on us to shut down the
954 * filesystem. This happens in paths where we detect
955 * corruption and decide to give up.
957 if ((tp->t_flags & XFS_TRANS_DIRTY) && !XFS_FORCED_SHUTDOWN(mp)) {
958 XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
959 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
962 if (!(flags & XFS_TRANS_ABORT) && !XFS_FORCED_SHUTDOWN(mp)) {
963 struct xfs_log_item_desc *lidp;
965 list_for_each_entry(lidp, &tp->t_items, lid_trans)
966 ASSERT(!(lidp->lid_item->li_type == XFS_LI_EFD));
969 xfs_trans_unreserve_and_mod_sb(tp);
970 xfs_trans_unreserve_and_mod_dquots(tp);
973 if (flags & XFS_TRANS_RELEASE_LOG_RES) {
974 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
975 log_flags = XFS_LOG_REL_PERM_RESERV;
979 xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
982 /* mark this thread as no longer being in a transaction */
983 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
985 xfs_trans_free_items(tp, NULLCOMMITLSN, flags);
990 * Roll from one trans in the sequence of PERMANENT transactions to
991 * the next: permanent transactions are only flushed out when
992 * committed with XFS_TRANS_RELEASE_LOG_RES, but we still want as soon
993 * as possible to let chunks of it go to the log. So we commit the
994 * chunk we've been working on and get a new transaction to continue.
998 struct xfs_trans **tpp,
999 struct xfs_inode *dp)
1001 struct xfs_trans *trans;
1002 struct xfs_trans_res tres;
1006 * Ensure that the inode is always logged.
1009 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
1012 * Copy the critical parameters from one trans to the next.
1014 tres.tr_logres = trans->t_log_res;
1015 tres.tr_logcount = trans->t_log_count;
1016 *tpp = xfs_trans_dup(trans);
1019 * Commit the current transaction.
1020 * If this commit failed, then it'd just unlock those items that
1021 * are not marked ihold. That also means that a filesystem shutdown
1022 * is in progress. The caller takes the responsibility to cancel
1023 * the duplicate transaction that gets returned.
1025 error = xfs_trans_commit(trans, 0);
1032 * transaction commit worked ok so we can drop the extra ticket
1033 * reference that we gained in xfs_trans_dup()
1035 xfs_log_ticket_put(trans->t_ticket);
1039 * Reserve space in the log for th next transaction.
1040 * This also pushes items in the "AIL", the list of logged items,
1041 * out to disk if they are taking up space at the tail of the log
1042 * that we want to use. This requires that either nothing be locked
1043 * across this call, or that anything that is locked be logged in
1044 * the prior and the next transactions.
1046 tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
1047 error = xfs_trans_reserve(trans, &tres, 0, 0);
1049 * Ensure that the inode is in the new transaction and locked.
1054 xfs_trans_ijoin(trans, dp, 0);