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_format.h"
22 #include "xfs_shared.h"
24 #include "xfs_trans.h"
27 #include "xfs_mount.h"
28 #include "xfs_error.h"
29 #include "xfs_da_btree.h"
30 #include "xfs_bmap_btree.h"
31 #include "xfs_alloc_btree.h"
32 #include "xfs_ialloc_btree.h"
33 #include "xfs_dinode.h"
34 #include "xfs_inode.h"
35 #include "xfs_btree.h"
36 #include "xfs_ialloc.h"
37 #include "xfs_alloc.h"
38 #include "xfs_extent_busy.h"
40 #include "xfs_quota.h"
42 #include "xfs_trans_priv.h"
43 #include "xfs_trans_space.h"
44 #include "xfs_inode_item.h"
45 #include "xfs_log_priv.h"
46 #include "xfs_buf_item.h"
47 #include "xfs_trace.h"
49 kmem_zone_t *xfs_trans_zone;
50 kmem_zone_t *xfs_log_item_desc_zone;
53 * Initialize the precomputed transaction reservation values
54 * in the mount structure.
60 xfs_trans_resv_calc(mp, M_RES(mp));
64 * This routine is called to allocate a transaction structure.
65 * The type parameter indicates the type of the transaction. These
66 * are enumerated in xfs_trans.h.
68 * Dynamically allocate the transaction structure from the transaction
69 * zone, initialize it, and return it to the caller.
78 sb_start_intwrite(mp->m_super);
79 tp = _xfs_trans_alloc(mp, type, KM_SLEEP);
80 tp->t_flags |= XFS_TRANS_FREEZE_PROT;
88 xfs_km_flags_t memflags)
92 WARN_ON(mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
93 atomic_inc(&mp->m_active_trans);
95 tp = kmem_zone_zalloc(xfs_trans_zone, memflags);
96 tp->t_magic = XFS_TRANS_HEADER_MAGIC;
99 INIT_LIST_HEAD(&tp->t_items);
100 INIT_LIST_HEAD(&tp->t_busy);
105 * Free the transaction structure. If there is more clean up
106 * to do when the structure is freed, add it here.
110 struct xfs_trans *tp)
112 xfs_extent_busy_sort(&tp->t_busy);
113 xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false);
115 atomic_dec(&tp->t_mountp->m_active_trans);
116 if (tp->t_flags & XFS_TRANS_FREEZE_PROT)
117 sb_end_intwrite(tp->t_mountp->m_super);
118 xfs_trans_free_dqinfo(tp);
119 kmem_zone_free(xfs_trans_zone, tp);
123 * This is called to create a new transaction which will share the
124 * permanent log reservation of the given transaction. The remaining
125 * unused block and rt extent reservations are also inherited. This
126 * implies that the original transaction is no longer allowed to allocate
127 * blocks. Locks and log items, however, are no inherited. They must
128 * be added to the new transaction explicitly.
136 ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
139 * Initialize the new transaction structure.
141 ntp->t_magic = XFS_TRANS_HEADER_MAGIC;
142 ntp->t_type = tp->t_type;
143 ntp->t_mountp = tp->t_mountp;
144 INIT_LIST_HEAD(&ntp->t_items);
145 INIT_LIST_HEAD(&ntp->t_busy);
147 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
148 ASSERT(tp->t_ticket != NULL);
150 ntp->t_flags = XFS_TRANS_PERM_LOG_RES |
151 (tp->t_flags & XFS_TRANS_RESERVE) |
152 (tp->t_flags & XFS_TRANS_FREEZE_PROT);
153 /* We gave our writer reference to the new transaction */
154 tp->t_flags &= ~XFS_TRANS_FREEZE_PROT;
155 ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
156 ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
157 tp->t_blk_res = tp->t_blk_res_used;
158 ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
159 tp->t_rtx_res = tp->t_rtx_res_used;
160 ntp->t_pflags = tp->t_pflags;
162 xfs_trans_dup_dqinfo(tp, ntp);
164 atomic_inc(&tp->t_mountp->m_active_trans);
169 * This is called to reserve free disk blocks and log space for the
170 * given transaction. This must be done before allocating any resources
171 * within the transaction.
173 * This will return ENOSPC if there are not enough blocks available.
174 * It will sleep waiting for available log space.
175 * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
176 * is used by long running transactions. If any one of the reservations
177 * fails then they will all be backed out.
179 * This does not do quota reservations. That typically is done by the
184 struct xfs_trans *tp,
185 struct xfs_trans_res *resp,
190 int rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
192 /* Mark this thread as being in a transaction */
193 current_set_flags_nested(&tp->t_pflags, PF_FSTRANS);
196 * Attempt to reserve the needed disk blocks by decrementing
197 * the number needed from the number available. This will
198 * fail if the count would go below zero.
201 error = xfs_icsb_modify_counters(tp->t_mountp, XFS_SBS_FDBLOCKS,
202 -((int64_t)blocks), rsvd);
204 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
205 return (XFS_ERROR(ENOSPC));
207 tp->t_blk_res += blocks;
211 * Reserve the log space needed for this transaction.
213 if (resp->tr_logres > 0) {
214 bool permanent = false;
216 ASSERT(tp->t_log_res == 0 ||
217 tp->t_log_res == resp->tr_logres);
218 ASSERT(tp->t_log_count == 0 ||
219 tp->t_log_count == resp->tr_logcount);
221 if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
222 tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
225 ASSERT(tp->t_ticket == NULL);
226 ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
229 if (tp->t_ticket != NULL) {
230 ASSERT(resp->tr_logflags & XFS_TRANS_PERM_LOG_RES);
231 error = xfs_log_regrant(tp->t_mountp, tp->t_ticket);
233 error = xfs_log_reserve(tp->t_mountp,
236 &tp->t_ticket, XFS_TRANSACTION,
237 permanent, tp->t_type);
243 tp->t_log_res = resp->tr_logres;
244 tp->t_log_count = resp->tr_logcount;
248 * Attempt to reserve the needed realtime extents by decrementing
249 * the number needed from the number available. This will
250 * fail if the count would go below zero.
253 error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FREXTENTS,
254 -((int64_t)rtextents), rsvd);
256 error = XFS_ERROR(ENOSPC);
259 tp->t_rtx_res += rtextents;
265 * Error cases jump to one of these labels to undo any
266 * reservations which have already been performed.
269 if (resp->tr_logres > 0) {
272 if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
273 log_flags = XFS_LOG_REL_PERM_RESERV;
277 xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, log_flags);
280 tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
285 xfs_icsb_modify_counters(tp->t_mountp, XFS_SBS_FDBLOCKS,
286 (int64_t)blocks, rsvd);
290 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
296 * Record the indicated change to the given field for application
297 * to the file system's superblock when the transaction commits.
298 * For now, just store the change in the transaction structure.
300 * Mark the transaction structure to indicate that the superblock
301 * needs to be updated before committing.
303 * Because we may not be keeping track of allocated/free inodes and
304 * used filesystem blocks in the superblock, we do not mark the
305 * superblock dirty in this transaction if we modify these fields.
306 * We still need to update the transaction deltas so that they get
307 * applied to the incore superblock, but we don't want them to
308 * cause the superblock to get locked and logged if these are the
309 * only fields in the superblock that the transaction modifies.
317 uint32_t flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
318 xfs_mount_t *mp = tp->t_mountp;
321 case XFS_TRANS_SB_ICOUNT:
322 tp->t_icount_delta += delta;
323 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
324 flags &= ~XFS_TRANS_SB_DIRTY;
326 case XFS_TRANS_SB_IFREE:
327 tp->t_ifree_delta += delta;
328 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
329 flags &= ~XFS_TRANS_SB_DIRTY;
331 case XFS_TRANS_SB_FDBLOCKS:
333 * Track the number of blocks allocated in the
334 * transaction. Make sure it does not exceed the
338 tp->t_blk_res_used += (uint)-delta;
339 ASSERT(tp->t_blk_res_used <= tp->t_blk_res);
341 tp->t_fdblocks_delta += delta;
342 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
343 flags &= ~XFS_TRANS_SB_DIRTY;
345 case XFS_TRANS_SB_RES_FDBLOCKS:
347 * The allocation has already been applied to the
348 * in-core superblock's counter. This should only
349 * be applied to the on-disk superblock.
352 tp->t_res_fdblocks_delta += delta;
353 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
354 flags &= ~XFS_TRANS_SB_DIRTY;
356 case XFS_TRANS_SB_FREXTENTS:
358 * Track the number of blocks allocated in the
359 * transaction. Make sure it does not exceed the
363 tp->t_rtx_res_used += (uint)-delta;
364 ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
366 tp->t_frextents_delta += delta;
368 case XFS_TRANS_SB_RES_FREXTENTS:
370 * The allocation has already been applied to the
371 * in-core superblock's counter. This should only
372 * be applied to the on-disk superblock.
375 tp->t_res_frextents_delta += delta;
377 case XFS_TRANS_SB_DBLOCKS:
379 tp->t_dblocks_delta += delta;
381 case XFS_TRANS_SB_AGCOUNT:
383 tp->t_agcount_delta += delta;
385 case XFS_TRANS_SB_IMAXPCT:
386 tp->t_imaxpct_delta += delta;
388 case XFS_TRANS_SB_REXTSIZE:
389 tp->t_rextsize_delta += delta;
391 case XFS_TRANS_SB_RBMBLOCKS:
392 tp->t_rbmblocks_delta += delta;
394 case XFS_TRANS_SB_RBLOCKS:
395 tp->t_rblocks_delta += delta;
397 case XFS_TRANS_SB_REXTENTS:
398 tp->t_rextents_delta += delta;
400 case XFS_TRANS_SB_REXTSLOG:
401 tp->t_rextslog_delta += delta;
408 tp->t_flags |= flags;
412 * xfs_trans_apply_sb_deltas() is called from the commit code
413 * to bring the superblock buffer into the current transaction
414 * and modify it as requested by earlier calls to xfs_trans_mod_sb().
416 * For now we just look at each field allowed to change and change
420 xfs_trans_apply_sb_deltas(
427 bp = xfs_trans_getsb(tp, tp->t_mountp, 0);
428 sbp = XFS_BUF_TO_SBP(bp);
431 * Check that superblock mods match the mods made to AGF counters.
433 ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
434 (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
435 tp->t_ag_btree_delta));
438 * Only update the superblock counters if we are logging them
440 if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
441 if (tp->t_icount_delta)
442 be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
443 if (tp->t_ifree_delta)
444 be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
445 if (tp->t_fdblocks_delta)
446 be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
447 if (tp->t_res_fdblocks_delta)
448 be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
451 if (tp->t_frextents_delta)
452 be64_add_cpu(&sbp->sb_frextents, tp->t_frextents_delta);
453 if (tp->t_res_frextents_delta)
454 be64_add_cpu(&sbp->sb_frextents, tp->t_res_frextents_delta);
456 if (tp->t_dblocks_delta) {
457 be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
460 if (tp->t_agcount_delta) {
461 be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
464 if (tp->t_imaxpct_delta) {
465 sbp->sb_imax_pct += tp->t_imaxpct_delta;
468 if (tp->t_rextsize_delta) {
469 be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
472 if (tp->t_rbmblocks_delta) {
473 be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
476 if (tp->t_rblocks_delta) {
477 be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
480 if (tp->t_rextents_delta) {
481 be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
484 if (tp->t_rextslog_delta) {
485 sbp->sb_rextslog += tp->t_rextslog_delta;
491 * Log the whole thing, the fields are noncontiguous.
493 xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
496 * Since all the modifiable fields are contiguous, we
497 * can get away with this.
499 xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
500 offsetof(xfs_dsb_t, sb_frextents) +
501 sizeof(sbp->sb_frextents) - 1);
505 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations
506 * and apply superblock counter changes to the in-core superblock. The
507 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
508 * applied to the in-core superblock. The idea is that that has already been
511 * This is done efficiently with a single call to xfs_mod_incore_sb_batch().
512 * However, we have to ensure that we only modify each superblock field only
513 * once because the application of the delta values may not be atomic. That can
514 * lead to ENOSPC races occurring if we have two separate modifcations of the
515 * free space counter to put back the entire reservation and then take away
518 * If we are not logging superblock counters, then the inode allocated/free and
519 * used block counts are not updated in the on disk superblock. In this case,
520 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
521 * still need to update the incore superblock with the changes.
524 xfs_trans_unreserve_and_mod_sb(
527 xfs_mod_sb_t msb[9]; /* If you add cases, add entries */
529 xfs_mount_t *mp = tp->t_mountp;
533 int64_t blkdelta = 0;
534 int64_t rtxdelta = 0;
536 int64_t ifreedelta = 0;
539 rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
541 /* calculate deltas */
542 if (tp->t_blk_res > 0)
543 blkdelta = tp->t_blk_res;
544 if ((tp->t_fdblocks_delta != 0) &&
545 (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
546 (tp->t_flags & XFS_TRANS_SB_DIRTY)))
547 blkdelta += tp->t_fdblocks_delta;
549 if (tp->t_rtx_res > 0)
550 rtxdelta = tp->t_rtx_res;
551 if ((tp->t_frextents_delta != 0) &&
552 (tp->t_flags & XFS_TRANS_SB_DIRTY))
553 rtxdelta += tp->t_frextents_delta;
555 if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
556 (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
557 idelta = tp->t_icount_delta;
558 ifreedelta = tp->t_ifree_delta;
561 /* apply the per-cpu counters */
563 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
570 error = xfs_icsb_modify_counters(mp, XFS_SBS_ICOUNT,
573 goto out_undo_fdblocks;
577 error = xfs_icsb_modify_counters(mp, XFS_SBS_IFREE,
580 goto out_undo_icount;
583 /* apply remaining deltas */
585 msbp->msb_field = XFS_SBS_FREXTENTS;
586 msbp->msb_delta = rtxdelta;
590 if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
591 if (tp->t_dblocks_delta != 0) {
592 msbp->msb_field = XFS_SBS_DBLOCKS;
593 msbp->msb_delta = tp->t_dblocks_delta;
596 if (tp->t_agcount_delta != 0) {
597 msbp->msb_field = XFS_SBS_AGCOUNT;
598 msbp->msb_delta = tp->t_agcount_delta;
601 if (tp->t_imaxpct_delta != 0) {
602 msbp->msb_field = XFS_SBS_IMAX_PCT;
603 msbp->msb_delta = tp->t_imaxpct_delta;
606 if (tp->t_rextsize_delta != 0) {
607 msbp->msb_field = XFS_SBS_REXTSIZE;
608 msbp->msb_delta = tp->t_rextsize_delta;
611 if (tp->t_rbmblocks_delta != 0) {
612 msbp->msb_field = XFS_SBS_RBMBLOCKS;
613 msbp->msb_delta = tp->t_rbmblocks_delta;
616 if (tp->t_rblocks_delta != 0) {
617 msbp->msb_field = XFS_SBS_RBLOCKS;
618 msbp->msb_delta = tp->t_rblocks_delta;
621 if (tp->t_rextents_delta != 0) {
622 msbp->msb_field = XFS_SBS_REXTENTS;
623 msbp->msb_delta = tp->t_rextents_delta;
626 if (tp->t_rextslog_delta != 0) {
627 msbp->msb_field = XFS_SBS_REXTSLOG;
628 msbp->msb_delta = tp->t_rextslog_delta;
634 * If we need to change anything, do it.
637 error = xfs_mod_incore_sb_batch(tp->t_mountp, msb,
638 (uint)(msbp - msb), rsvd);
640 goto out_undo_ifreecount;
647 xfs_icsb_modify_counters(mp, XFS_SBS_IFREE, -ifreedelta, rsvd);
650 xfs_icsb_modify_counters(mp, XFS_SBS_ICOUNT, -idelta, rsvd);
653 xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS, -blkdelta, rsvd);
660 * Add the given log item to the transaction's list of log items.
662 * The log item will now point to its new descriptor with its li_desc field.
666 struct xfs_trans *tp,
667 struct xfs_log_item *lip)
669 struct xfs_log_item_desc *lidp;
671 ASSERT(lip->li_mountp == tp->t_mountp);
672 ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
674 lidp = kmem_zone_zalloc(xfs_log_item_desc_zone, KM_SLEEP | KM_NOFS);
676 lidp->lid_item = lip;
678 list_add_tail(&lidp->lid_trans, &tp->t_items);
684 xfs_trans_free_item_desc(
685 struct xfs_log_item_desc *lidp)
687 list_del_init(&lidp->lid_trans);
688 kmem_zone_free(xfs_log_item_desc_zone, lidp);
692 * Unlink and free the given descriptor.
696 struct xfs_log_item *lip)
698 xfs_trans_free_item_desc(lip->li_desc);
703 * Unlock all of the items of a transaction and free all the descriptors
704 * of that transaction.
707 xfs_trans_free_items(
708 struct xfs_trans *tp,
709 xfs_lsn_t commit_lsn,
712 struct xfs_log_item_desc *lidp, *next;
714 list_for_each_entry_safe(lidp, next, &tp->t_items, lid_trans) {
715 struct xfs_log_item *lip = lidp->lid_item;
719 if (commit_lsn != NULLCOMMITLSN)
720 lip->li_ops->iop_committing(lip, commit_lsn);
721 if (flags & XFS_TRANS_ABORT)
722 lip->li_flags |= XFS_LI_ABORTED;
723 lip->li_ops->iop_unlock(lip);
725 xfs_trans_free_item_desc(lidp);
730 xfs_log_item_batch_insert(
731 struct xfs_ail *ailp,
732 struct xfs_ail_cursor *cur,
733 struct xfs_log_item **log_items,
735 xfs_lsn_t commit_lsn)
739 spin_lock(&ailp->xa_lock);
740 /* xfs_trans_ail_update_bulk drops ailp->xa_lock */
741 xfs_trans_ail_update_bulk(ailp, cur, log_items, nr_items, commit_lsn);
743 for (i = 0; i < nr_items; i++) {
744 struct xfs_log_item *lip = log_items[i];
746 lip->li_ops->iop_unpin(lip, 0);
751 * Bulk operation version of xfs_trans_committed that takes a log vector of
752 * items to insert into the AIL. This uses bulk AIL insertion techniques to
753 * minimise lock traffic.
755 * If we are called with the aborted flag set, it is because a log write during
756 * a CIL checkpoint commit has failed. In this case, all the items in the
757 * checkpoint have already gone through iop_commited and iop_unlock, which
758 * means that checkpoint commit abort handling is treated exactly the same
759 * as an iclog write error even though we haven't started any IO yet. Hence in
760 * this case all we need to do is iop_committed processing, followed by an
761 * iop_unpin(aborted) call.
763 * The AIL cursor is used to optimise the insert process. If commit_lsn is not
764 * at the end of the AIL, the insert cursor avoids the need to walk
765 * the AIL to find the insertion point on every xfs_log_item_batch_insert()
766 * call. This saves a lot of needless list walking and is a net win, even
767 * though it slightly increases that amount of AIL lock traffic to set it up
771 xfs_trans_committed_bulk(
772 struct xfs_ail *ailp,
773 struct xfs_log_vec *log_vector,
774 xfs_lsn_t commit_lsn,
777 #define LOG_ITEM_BATCH_SIZE 32
778 struct xfs_log_item *log_items[LOG_ITEM_BATCH_SIZE];
779 struct xfs_log_vec *lv;
780 struct xfs_ail_cursor cur;
783 spin_lock(&ailp->xa_lock);
784 xfs_trans_ail_cursor_last(ailp, &cur, commit_lsn);
785 spin_unlock(&ailp->xa_lock);
787 /* unpin all the log items */
788 for (lv = log_vector; lv; lv = lv->lv_next ) {
789 struct xfs_log_item *lip = lv->lv_item;
793 lip->li_flags |= XFS_LI_ABORTED;
794 item_lsn = lip->li_ops->iop_committed(lip, commit_lsn);
796 /* item_lsn of -1 means the item needs no further processing */
797 if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
801 * if we are aborting the operation, no point in inserting the
802 * object into the AIL as we are in a shutdown situation.
805 ASSERT(XFS_FORCED_SHUTDOWN(ailp->xa_mount));
806 lip->li_ops->iop_unpin(lip, 1);
810 if (item_lsn != commit_lsn) {
813 * Not a bulk update option due to unusual item_lsn.
814 * Push into AIL immediately, rechecking the lsn once
815 * we have the ail lock. Then unpin the item. This does
816 * not affect the AIL cursor the bulk insert path is
819 spin_lock(&ailp->xa_lock);
820 if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0)
821 xfs_trans_ail_update(ailp, lip, item_lsn);
823 spin_unlock(&ailp->xa_lock);
824 lip->li_ops->iop_unpin(lip, 0);
828 /* Item is a candidate for bulk AIL insert. */
829 log_items[i++] = lv->lv_item;
830 if (i >= LOG_ITEM_BATCH_SIZE) {
831 xfs_log_item_batch_insert(ailp, &cur, log_items,
832 LOG_ITEM_BATCH_SIZE, commit_lsn);
837 /* make sure we insert the remainder! */
839 xfs_log_item_batch_insert(ailp, &cur, log_items, i, commit_lsn);
841 spin_lock(&ailp->xa_lock);
842 xfs_trans_ail_cursor_done(ailp, &cur);
843 spin_unlock(&ailp->xa_lock);
847 * Commit the given transaction to the log.
849 * XFS disk error handling mechanism is not based on a typical
850 * transaction abort mechanism. Logically after the filesystem
851 * gets marked 'SHUTDOWN', we can't let any new transactions
852 * be durable - ie. committed to disk - because some metadata might
853 * be inconsistent. In such cases, this returns an error, and the
854 * caller may assume that all locked objects joined to the transaction
855 * have already been unlocked as if the commit had succeeded.
856 * Do not reference the transaction structure after this call.
860 struct xfs_trans *tp,
863 struct xfs_mount *mp = tp->t_mountp;
864 xfs_lsn_t commit_lsn = -1;
867 int sync = tp->t_flags & XFS_TRANS_SYNC;
870 * Determine whether this commit is releasing a permanent
871 * log reservation or not.
873 if (flags & XFS_TRANS_RELEASE_LOG_RES) {
874 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
875 log_flags = XFS_LOG_REL_PERM_RESERV;
879 * If there is nothing to be logged by the transaction,
880 * then unlock all of the items associated with the
881 * transaction and free the transaction structure.
882 * Also make sure to return any reserved blocks to
885 if (!(tp->t_flags & XFS_TRANS_DIRTY))
888 if (XFS_FORCED_SHUTDOWN(mp)) {
889 error = XFS_ERROR(EIO);
893 ASSERT(tp->t_ticket != NULL);
896 * If we need to update the superblock, then do it now.
898 if (tp->t_flags & XFS_TRANS_SB_DIRTY)
899 xfs_trans_apply_sb_deltas(tp);
900 xfs_trans_apply_dquot_deltas(tp);
902 error = xfs_log_commit_cil(mp, tp, &commit_lsn, flags);
903 if (error == ENOMEM) {
904 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
905 error = XFS_ERROR(EIO);
909 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
913 * If the transaction needs to be synchronous, then force the
914 * log out now and wait for it.
918 error = _xfs_log_force_lsn(mp, commit_lsn,
921 XFS_STATS_INC(xs_trans_sync);
923 XFS_STATS_INC(xs_trans_async);
929 xfs_trans_unreserve_and_mod_sb(tp);
932 * It is indeed possible for the transaction to be not dirty but
933 * the dqinfo portion to be. All that means is that we have some
934 * (non-persistent) quota reservations that need to be unreserved.
936 xfs_trans_unreserve_and_mod_dquots(tp);
938 commit_lsn = xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
939 if (commit_lsn == -1 && !error)
940 error = XFS_ERROR(EIO);
942 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
943 xfs_trans_free_items(tp, NULLCOMMITLSN, error ? XFS_TRANS_ABORT : 0);
946 XFS_STATS_INC(xs_trans_empty);
951 * Unlock all of the transaction's items and free the transaction.
952 * The transaction must not have modified any of its items, because
953 * there is no way to restore them to their previous state.
955 * If the transaction has made a log reservation, make sure to release
964 xfs_mount_t *mp = tp->t_mountp;
967 * See if the caller is being too lazy to figure out if
968 * the transaction really needs an abort.
970 if ((flags & XFS_TRANS_ABORT) && !(tp->t_flags & XFS_TRANS_DIRTY))
971 flags &= ~XFS_TRANS_ABORT;
973 * See if the caller is relying on us to shut down the
974 * filesystem. This happens in paths where we detect
975 * corruption and decide to give up.
977 if ((tp->t_flags & XFS_TRANS_DIRTY) && !XFS_FORCED_SHUTDOWN(mp)) {
978 XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
979 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
982 if (!(flags & XFS_TRANS_ABORT) && !XFS_FORCED_SHUTDOWN(mp)) {
983 struct xfs_log_item_desc *lidp;
985 list_for_each_entry(lidp, &tp->t_items, lid_trans)
986 ASSERT(!(lidp->lid_item->li_type == XFS_LI_EFD));
989 xfs_trans_unreserve_and_mod_sb(tp);
990 xfs_trans_unreserve_and_mod_dquots(tp);
993 if (flags & XFS_TRANS_RELEASE_LOG_RES) {
994 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
995 log_flags = XFS_LOG_REL_PERM_RESERV;
999 xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
1002 /* mark this thread as no longer being in a transaction */
1003 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
1005 xfs_trans_free_items(tp, NULLCOMMITLSN, flags);
1010 * Roll from one trans in the sequence of PERMANENT transactions to
1011 * the next: permanent transactions are only flushed out when
1012 * committed with XFS_TRANS_RELEASE_LOG_RES, but we still want as soon
1013 * as possible to let chunks of it go to the log. So we commit the
1014 * chunk we've been working on and get a new transaction to continue.
1018 struct xfs_trans **tpp,
1019 struct xfs_inode *dp)
1021 struct xfs_trans *trans;
1022 struct xfs_trans_res tres;
1026 * Ensure that the inode is always logged.
1029 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
1032 * Copy the critical parameters from one trans to the next.
1034 tres.tr_logres = trans->t_log_res;
1035 tres.tr_logcount = trans->t_log_count;
1036 *tpp = xfs_trans_dup(trans);
1039 * Commit the current transaction.
1040 * If this commit failed, then it'd just unlock those items that
1041 * are not marked ihold. That also means that a filesystem shutdown
1042 * is in progress. The caller takes the responsibility to cancel
1043 * the duplicate transaction that gets returned.
1045 error = xfs_trans_commit(trans, 0);
1052 * transaction commit worked ok so we can drop the extra ticket
1053 * reference that we gained in xfs_trans_dup()
1055 xfs_log_ticket_put(trans->t_ticket);
1059 * Reserve space in the log for th next transaction.
1060 * This also pushes items in the "AIL", the list of logged items,
1061 * out to disk if they are taking up space at the tail of the log
1062 * that we want to use. This requires that either nothing be locked
1063 * across this call, or that anything that is locked be logged in
1064 * the prior and the next transactions.
1066 tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
1067 error = xfs_trans_reserve(trans, &tres, 0, 0);
1069 * Ensure that the inode is in the new transaction and locked.
1074 xfs_trans_ijoin(trans, dp, 0);