1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
4 * Copyright (C) 2010 Red Hat, Inc.
9 #include "xfs_shared.h"
10 #include "xfs_format.h"
11 #include "xfs_log_format.h"
12 #include "xfs_log_priv.h"
13 #include "xfs_trans_resv.h"
14 #include "xfs_mount.h"
15 #include "xfs_extent_busy.h"
16 #include "xfs_quota.h"
17 #include "xfs_trans.h"
18 #include "xfs_trans_priv.h"
20 #include "xfs_trace.h"
21 #include "xfs_error.h"
22 #include "xfs_defer.h"
24 kmem_zone_t *xfs_trans_zone;
26 #if defined(CONFIG_TRACEPOINTS)
28 xfs_trans_trace_reservations(
31 struct xfs_trans_res resv;
32 struct xfs_trans_res *res;
33 struct xfs_trans_res *end_res;
36 res = (struct xfs_trans_res *)M_RES(mp);
37 end_res = (struct xfs_trans_res *)(M_RES(mp) + 1);
38 for (i = 0; res < end_res; i++, res++)
39 trace_xfs_trans_resv_calc(mp, i, res);
40 xfs_log_get_max_trans_res(mp, &resv);
41 trace_xfs_trans_resv_calc(mp, -1, &resv);
44 # define xfs_trans_trace_reservations(mp)
48 * Initialize the precomputed transaction reservation values
49 * in the mount structure.
55 xfs_trans_resv_calc(mp, M_RES(mp));
56 xfs_trans_trace_reservations(mp);
60 * Free the transaction structure. If there is more clean up
61 * to do when the structure is freed, add it here.
67 xfs_extent_busy_sort(&tp->t_busy);
68 xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false);
70 trace_xfs_trans_free(tp, _RET_IP_);
71 if (!(tp->t_flags & XFS_TRANS_NO_WRITECOUNT))
72 sb_end_intwrite(tp->t_mountp->m_super);
73 xfs_trans_free_dqinfo(tp);
74 kmem_cache_free(xfs_trans_zone, tp);
78 * This is called to create a new transaction which will share the
79 * permanent log reservation of the given transaction. The remaining
80 * unused block and rt extent reservations are also inherited. This
81 * implies that the original transaction is no longer allowed to allocate
82 * blocks. Locks and log items, however, are no inherited. They must
83 * be added to the new transaction explicitly.
85 STATIC struct xfs_trans *
89 struct xfs_trans *ntp;
91 trace_xfs_trans_dup(tp, _RET_IP_);
93 ntp = kmem_zone_zalloc(xfs_trans_zone, 0);
96 * Initialize the new transaction structure.
98 ntp->t_magic = XFS_TRANS_HEADER_MAGIC;
99 ntp->t_mountp = tp->t_mountp;
100 INIT_LIST_HEAD(&ntp->t_items);
101 INIT_LIST_HEAD(&ntp->t_busy);
102 INIT_LIST_HEAD(&ntp->t_dfops);
103 ntp->t_firstblock = NULLFSBLOCK;
105 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
106 ASSERT(tp->t_ticket != NULL);
108 ntp->t_flags = XFS_TRANS_PERM_LOG_RES |
109 (tp->t_flags & XFS_TRANS_RESERVE) |
110 (tp->t_flags & XFS_TRANS_NO_WRITECOUNT);
111 /* We gave our writer reference to the new transaction */
112 tp->t_flags |= XFS_TRANS_NO_WRITECOUNT;
113 ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
115 ASSERT(tp->t_blk_res >= tp->t_blk_res_used);
116 ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
117 tp->t_blk_res = tp->t_blk_res_used;
119 ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
120 tp->t_rtx_res = tp->t_rtx_res_used;
121 ntp->t_pflags = tp->t_pflags;
123 /* move deferred ops over to the new tp */
124 xfs_defer_move(ntp, tp);
126 xfs_trans_dup_dqinfo(tp, ntp);
131 * This is called to reserve free disk blocks and log space for the
132 * given transaction. This must be done before allocating any resources
133 * within the transaction.
135 * This will return ENOSPC if there are not enough blocks available.
136 * It will sleep waiting for available log space.
137 * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
138 * is used by long running transactions. If any one of the reservations
139 * fails then they will all be backed out.
141 * This does not do quota reservations. That typically is done by the
146 struct xfs_trans *tp,
147 struct xfs_trans_res *resp,
151 struct xfs_mount *mp = tp->t_mountp;
153 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
155 /* Mark this thread as being in a transaction */
156 current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
159 * Attempt to reserve the needed disk blocks by decrementing
160 * the number needed from the number available. This will
161 * fail if the count would go below zero.
164 error = xfs_mod_fdblocks(mp, -((int64_t)blocks), rsvd);
166 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
169 tp->t_blk_res += blocks;
173 * Reserve the log space needed for this transaction.
175 if (resp->tr_logres > 0) {
176 bool permanent = false;
178 ASSERT(tp->t_log_res == 0 ||
179 tp->t_log_res == resp->tr_logres);
180 ASSERT(tp->t_log_count == 0 ||
181 tp->t_log_count == resp->tr_logcount);
183 if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
184 tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
187 ASSERT(tp->t_ticket == NULL);
188 ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
191 if (tp->t_ticket != NULL) {
192 ASSERT(resp->tr_logflags & XFS_TRANS_PERM_LOG_RES);
193 error = xfs_log_regrant(mp, tp->t_ticket);
195 error = xfs_log_reserve(mp,
198 &tp->t_ticket, XFS_TRANSACTION,
205 tp->t_log_res = resp->tr_logres;
206 tp->t_log_count = resp->tr_logcount;
210 * Attempt to reserve the needed realtime extents by decrementing
211 * the number needed from the number available. This will
212 * fail if the count would go below zero.
215 error = xfs_mod_frextents(mp, -((int64_t)rtextents));
220 tp->t_rtx_res += rtextents;
226 * Error cases jump to one of these labels to undo any
227 * reservations which have already been performed.
230 if (resp->tr_logres > 0) {
231 xfs_log_ticket_ungrant(mp->m_log, tp->t_ticket);
234 tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
239 xfs_mod_fdblocks(mp, (int64_t)blocks, rsvd);
243 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
250 struct xfs_mount *mp,
251 struct xfs_trans_res *resp,
255 struct xfs_trans **tpp)
257 struct xfs_trans *tp;
261 * Allocate the handle before we do our freeze accounting and setting up
262 * GFP_NOFS allocation context so that we avoid lockdep false positives
263 * by doing GFP_KERNEL allocations inside sb_start_intwrite().
265 tp = kmem_zone_zalloc(xfs_trans_zone, 0);
266 if (!(flags & XFS_TRANS_NO_WRITECOUNT))
267 sb_start_intwrite(mp->m_super);
270 * Zero-reservation ("empty") transactions can't modify anything, so
271 * they're allowed to run while we're frozen.
273 WARN_ON(resp->tr_logres > 0 &&
274 mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
276 tp->t_magic = XFS_TRANS_HEADER_MAGIC;
279 INIT_LIST_HEAD(&tp->t_items);
280 INIT_LIST_HEAD(&tp->t_busy);
281 INIT_LIST_HEAD(&tp->t_dfops);
282 tp->t_firstblock = NULLFSBLOCK;
284 error = xfs_trans_reserve(tp, resp, blocks, rtextents);
286 xfs_trans_cancel(tp);
290 trace_xfs_trans_alloc(tp, _RET_IP_);
297 * Create an empty transaction with no reservation. This is a defensive
298 * mechanism for routines that query metadata without actually modifying them --
299 * if the metadata being queried is somehow cross-linked (think a btree block
300 * pointer that points higher in the tree), we risk deadlock. However, blocks
301 * grabbed as part of a transaction can be re-grabbed. The verifiers will
302 * notice the corrupt block and the operation will fail back to userspace
303 * without deadlocking.
305 * Note the zero-length reservation; this transaction MUST be cancelled without
308 * Callers should obtain freeze protection to avoid a conflict with fs freezing
309 * where we can be grabbing buffers at the same time that freeze is trying to
310 * drain the buffer LRU list.
313 xfs_trans_alloc_empty(
314 struct xfs_mount *mp,
315 struct xfs_trans **tpp)
317 struct xfs_trans_res resv = {0};
319 return xfs_trans_alloc(mp, &resv, 0, 0, XFS_TRANS_NO_WRITECOUNT, tpp);
323 * Record the indicated change to the given field for application
324 * to the file system's superblock when the transaction commits.
325 * For now, just store the change in the transaction structure.
327 * Mark the transaction structure to indicate that the superblock
328 * needs to be updated before committing.
330 * Because we may not be keeping track of allocated/free inodes and
331 * used filesystem blocks in the superblock, we do not mark the
332 * superblock dirty in this transaction if we modify these fields.
333 * We still need to update the transaction deltas so that they get
334 * applied to the incore superblock, but we don't want them to
335 * cause the superblock to get locked and logged if these are the
336 * only fields in the superblock that the transaction modifies.
344 uint32_t flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
345 xfs_mount_t *mp = tp->t_mountp;
348 case XFS_TRANS_SB_ICOUNT:
349 tp->t_icount_delta += delta;
350 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
351 flags &= ~XFS_TRANS_SB_DIRTY;
353 case XFS_TRANS_SB_IFREE:
354 tp->t_ifree_delta += delta;
355 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
356 flags &= ~XFS_TRANS_SB_DIRTY;
358 case XFS_TRANS_SB_FDBLOCKS:
360 * Track the number of blocks allocated in the transaction.
361 * Make sure it does not exceed the number reserved. If so,
362 * shutdown as this can lead to accounting inconsistency.
365 tp->t_blk_res_used += (uint)-delta;
366 if (tp->t_blk_res_used > tp->t_blk_res)
367 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
369 tp->t_fdblocks_delta += delta;
370 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
371 flags &= ~XFS_TRANS_SB_DIRTY;
373 case XFS_TRANS_SB_RES_FDBLOCKS:
375 * The allocation has already been applied to the
376 * in-core superblock's counter. This should only
377 * be applied to the on-disk superblock.
379 tp->t_res_fdblocks_delta += delta;
380 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
381 flags &= ~XFS_TRANS_SB_DIRTY;
383 case XFS_TRANS_SB_FREXTENTS:
385 * Track the number of blocks allocated in the
386 * transaction. Make sure it does not exceed the
390 tp->t_rtx_res_used += (uint)-delta;
391 ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
393 tp->t_frextents_delta += delta;
395 case XFS_TRANS_SB_RES_FREXTENTS:
397 * The allocation has already been applied to the
398 * in-core superblock's counter. This should only
399 * be applied to the on-disk superblock.
402 tp->t_res_frextents_delta += delta;
404 case XFS_TRANS_SB_DBLOCKS:
406 tp->t_dblocks_delta += delta;
408 case XFS_TRANS_SB_AGCOUNT:
410 tp->t_agcount_delta += delta;
412 case XFS_TRANS_SB_IMAXPCT:
413 tp->t_imaxpct_delta += delta;
415 case XFS_TRANS_SB_REXTSIZE:
416 tp->t_rextsize_delta += delta;
418 case XFS_TRANS_SB_RBMBLOCKS:
419 tp->t_rbmblocks_delta += delta;
421 case XFS_TRANS_SB_RBLOCKS:
422 tp->t_rblocks_delta += delta;
424 case XFS_TRANS_SB_REXTENTS:
425 tp->t_rextents_delta += delta;
427 case XFS_TRANS_SB_REXTSLOG:
428 tp->t_rextslog_delta += delta;
435 tp->t_flags |= flags;
439 * xfs_trans_apply_sb_deltas() is called from the commit code
440 * to bring the superblock buffer into the current transaction
441 * and modify it as requested by earlier calls to xfs_trans_mod_sb().
443 * For now we just look at each field allowed to change and change
447 xfs_trans_apply_sb_deltas(
454 bp = xfs_trans_getsb(tp, tp->t_mountp);
458 * Check that superblock mods match the mods made to AGF counters.
460 ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
461 (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
462 tp->t_ag_btree_delta));
465 * Only update the superblock counters if we are logging them
467 if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
468 if (tp->t_icount_delta)
469 be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
470 if (tp->t_ifree_delta)
471 be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
472 if (tp->t_fdblocks_delta)
473 be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
474 if (tp->t_res_fdblocks_delta)
475 be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
478 if (tp->t_frextents_delta)
479 be64_add_cpu(&sbp->sb_frextents, tp->t_frextents_delta);
480 if (tp->t_res_frextents_delta)
481 be64_add_cpu(&sbp->sb_frextents, tp->t_res_frextents_delta);
483 if (tp->t_dblocks_delta) {
484 be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
487 if (tp->t_agcount_delta) {
488 be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
491 if (tp->t_imaxpct_delta) {
492 sbp->sb_imax_pct += tp->t_imaxpct_delta;
495 if (tp->t_rextsize_delta) {
496 be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
499 if (tp->t_rbmblocks_delta) {
500 be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
503 if (tp->t_rblocks_delta) {
504 be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
507 if (tp->t_rextents_delta) {
508 be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
511 if (tp->t_rextslog_delta) {
512 sbp->sb_rextslog += tp->t_rextslog_delta;
516 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
519 * Log the whole thing, the fields are noncontiguous.
521 xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
524 * Since all the modifiable fields are contiguous, we
525 * can get away with this.
527 xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
528 offsetof(xfs_dsb_t, sb_frextents) +
529 sizeof(sbp->sb_frextents) - 1);
533 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations and
534 * apply superblock counter changes to the in-core superblock. The
535 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
536 * applied to the in-core superblock. The idea is that that has already been
539 * If we are not logging superblock counters, then the inode allocated/free and
540 * used block counts are not updated in the on disk superblock. In this case,
541 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
542 * still need to update the incore superblock with the changes.
544 * Deltas for the inode count are +/-64, hence we use a large batch size of 128
545 * so we don't need to take the counter lock on every update.
547 #define XFS_ICOUNT_BATCH 128
550 xfs_trans_unreserve_and_mod_sb(
551 struct xfs_trans *tp)
553 struct xfs_mount *mp = tp->t_mountp;
554 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
555 int64_t blkdelta = 0;
556 int64_t rtxdelta = 0;
558 int64_t ifreedelta = 0;
561 /* calculate deltas */
562 if (tp->t_blk_res > 0)
563 blkdelta = tp->t_blk_res;
564 if ((tp->t_fdblocks_delta != 0) &&
565 (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
566 (tp->t_flags & XFS_TRANS_SB_DIRTY)))
567 blkdelta += tp->t_fdblocks_delta;
569 if (tp->t_rtx_res > 0)
570 rtxdelta = tp->t_rtx_res;
571 if ((tp->t_frextents_delta != 0) &&
572 (tp->t_flags & XFS_TRANS_SB_DIRTY))
573 rtxdelta += tp->t_frextents_delta;
575 if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
576 (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
577 idelta = tp->t_icount_delta;
578 ifreedelta = tp->t_ifree_delta;
581 /* apply the per-cpu counters */
583 error = xfs_mod_fdblocks(mp, blkdelta, rsvd);
588 percpu_counter_add_batch(&mp->m_icount, idelta,
591 ASSERT(__percpu_counter_compare(&mp->m_icount, 0,
592 XFS_ICOUNT_BATCH) >= 0);
596 percpu_counter_add(&mp->m_ifree, ifreedelta);
598 ASSERT(percpu_counter_compare(&mp->m_ifree, 0) >= 0);
601 if (rtxdelta == 0 && !(tp->t_flags & XFS_TRANS_SB_DIRTY))
604 /* apply remaining deltas */
605 spin_lock(&mp->m_sb_lock);
606 mp->m_sb.sb_frextents += rtxdelta;
607 mp->m_sb.sb_dblocks += tp->t_dblocks_delta;
608 mp->m_sb.sb_agcount += tp->t_agcount_delta;
609 mp->m_sb.sb_imax_pct += tp->t_imaxpct_delta;
610 mp->m_sb.sb_rextsize += tp->t_rextsize_delta;
611 mp->m_sb.sb_rbmblocks += tp->t_rbmblocks_delta;
612 mp->m_sb.sb_rblocks += tp->t_rblocks_delta;
613 mp->m_sb.sb_rextents += tp->t_rextents_delta;
614 mp->m_sb.sb_rextslog += tp->t_rextslog_delta;
615 spin_unlock(&mp->m_sb_lock);
618 * Debug checks outside of the spinlock so they don't lock up the
619 * machine if they fail.
621 ASSERT(mp->m_sb.sb_imax_pct >= 0);
622 ASSERT(mp->m_sb.sb_rextslog >= 0);
626 /* Add the given log item to the transaction's list of log items. */
629 struct xfs_trans *tp,
630 struct xfs_log_item *lip)
632 ASSERT(lip->li_mountp == tp->t_mountp);
633 ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
634 ASSERT(list_empty(&lip->li_trans));
635 ASSERT(!test_bit(XFS_LI_DIRTY, &lip->li_flags));
637 list_add_tail(&lip->li_trans, &tp->t_items);
638 trace_xfs_trans_add_item(tp, _RET_IP_);
642 * Unlink the log item from the transaction. the log item is no longer
643 * considered dirty in this transaction, as the linked transaction has
644 * finished, either by abort or commit completion.
648 struct xfs_log_item *lip)
650 clear_bit(XFS_LI_DIRTY, &lip->li_flags);
651 list_del_init(&lip->li_trans);
654 /* Detach and unlock all of the items in a transaction */
656 xfs_trans_free_items(
657 struct xfs_trans *tp,
660 struct xfs_log_item *lip, *next;
662 trace_xfs_trans_free_items(tp, _RET_IP_);
664 list_for_each_entry_safe(lip, next, &tp->t_items, li_trans) {
665 xfs_trans_del_item(lip);
667 set_bit(XFS_LI_ABORTED, &lip->li_flags);
668 if (lip->li_ops->iop_release)
669 lip->li_ops->iop_release(lip);
674 xfs_log_item_batch_insert(
675 struct xfs_ail *ailp,
676 struct xfs_ail_cursor *cur,
677 struct xfs_log_item **log_items,
679 xfs_lsn_t commit_lsn)
683 spin_lock(&ailp->ail_lock);
684 /* xfs_trans_ail_update_bulk drops ailp->ail_lock */
685 xfs_trans_ail_update_bulk(ailp, cur, log_items, nr_items, commit_lsn);
687 for (i = 0; i < nr_items; i++) {
688 struct xfs_log_item *lip = log_items[i];
690 if (lip->li_ops->iop_unpin)
691 lip->li_ops->iop_unpin(lip, 0);
696 * Bulk operation version of xfs_trans_committed that takes a log vector of
697 * items to insert into the AIL. This uses bulk AIL insertion techniques to
698 * minimise lock traffic.
700 * If we are called with the aborted flag set, it is because a log write during
701 * a CIL checkpoint commit has failed. In this case, all the items in the
702 * checkpoint have already gone through iop_committed and iop_committing, which
703 * means that checkpoint commit abort handling is treated exactly the same
704 * as an iclog write error even though we haven't started any IO yet. Hence in
705 * this case all we need to do is iop_committed processing, followed by an
706 * iop_unpin(aborted) call.
708 * The AIL cursor is used to optimise the insert process. If commit_lsn is not
709 * at the end of the AIL, the insert cursor avoids the need to walk
710 * the AIL to find the insertion point on every xfs_log_item_batch_insert()
711 * call. This saves a lot of needless list walking and is a net win, even
712 * though it slightly increases that amount of AIL lock traffic to set it up
716 xfs_trans_committed_bulk(
717 struct xfs_ail *ailp,
718 struct xfs_log_vec *log_vector,
719 xfs_lsn_t commit_lsn,
722 #define LOG_ITEM_BATCH_SIZE 32
723 struct xfs_log_item *log_items[LOG_ITEM_BATCH_SIZE];
724 struct xfs_log_vec *lv;
725 struct xfs_ail_cursor cur;
728 spin_lock(&ailp->ail_lock);
729 xfs_trans_ail_cursor_last(ailp, &cur, commit_lsn);
730 spin_unlock(&ailp->ail_lock);
732 /* unpin all the log items */
733 for (lv = log_vector; lv; lv = lv->lv_next ) {
734 struct xfs_log_item *lip = lv->lv_item;
738 set_bit(XFS_LI_ABORTED, &lip->li_flags);
740 if (lip->li_ops->flags & XFS_ITEM_RELEASE_WHEN_COMMITTED) {
741 lip->li_ops->iop_release(lip);
745 if (lip->li_ops->iop_committed)
746 item_lsn = lip->li_ops->iop_committed(lip, commit_lsn);
748 item_lsn = commit_lsn;
750 /* item_lsn of -1 means the item needs no further processing */
751 if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
755 * if we are aborting the operation, no point in inserting the
756 * object into the AIL as we are in a shutdown situation.
759 ASSERT(XFS_FORCED_SHUTDOWN(ailp->ail_mount));
760 if (lip->li_ops->iop_unpin)
761 lip->li_ops->iop_unpin(lip, 1);
765 if (item_lsn != commit_lsn) {
768 * Not a bulk update option due to unusual item_lsn.
769 * Push into AIL immediately, rechecking the lsn once
770 * we have the ail lock. Then unpin the item. This does
771 * not affect the AIL cursor the bulk insert path is
774 spin_lock(&ailp->ail_lock);
775 if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0)
776 xfs_trans_ail_update(ailp, lip, item_lsn);
778 spin_unlock(&ailp->ail_lock);
779 if (lip->li_ops->iop_unpin)
780 lip->li_ops->iop_unpin(lip, 0);
784 /* Item is a candidate for bulk AIL insert. */
785 log_items[i++] = lv->lv_item;
786 if (i >= LOG_ITEM_BATCH_SIZE) {
787 xfs_log_item_batch_insert(ailp, &cur, log_items,
788 LOG_ITEM_BATCH_SIZE, commit_lsn);
793 /* make sure we insert the remainder! */
795 xfs_log_item_batch_insert(ailp, &cur, log_items, i, commit_lsn);
797 spin_lock(&ailp->ail_lock);
798 xfs_trans_ail_cursor_done(&cur);
799 spin_unlock(&ailp->ail_lock);
803 * Commit the given transaction to the log.
805 * XFS disk error handling mechanism is not based on a typical
806 * transaction abort mechanism. Logically after the filesystem
807 * gets marked 'SHUTDOWN', we can't let any new transactions
808 * be durable - ie. committed to disk - because some metadata might
809 * be inconsistent. In such cases, this returns an error, and the
810 * caller may assume that all locked objects joined to the transaction
811 * have already been unlocked as if the commit had succeeded.
812 * Do not reference the transaction structure after this call.
816 struct xfs_trans *tp,
819 struct xfs_mount *mp = tp->t_mountp;
820 xfs_lsn_t commit_lsn = -1;
822 int sync = tp->t_flags & XFS_TRANS_SYNC;
824 trace_xfs_trans_commit(tp, _RET_IP_);
827 * Finish deferred items on final commit. Only permanent transactions
828 * should ever have deferred ops.
830 WARN_ON_ONCE(!list_empty(&tp->t_dfops) &&
831 !(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
832 if (!regrant && (tp->t_flags & XFS_TRANS_PERM_LOG_RES)) {
833 error = xfs_defer_finish_noroll(&tp);
839 * If there is nothing to be logged by the transaction,
840 * then unlock all of the items associated with the
841 * transaction and free the transaction structure.
842 * Also make sure to return any reserved blocks to
845 if (!(tp->t_flags & XFS_TRANS_DIRTY))
848 if (XFS_FORCED_SHUTDOWN(mp)) {
853 ASSERT(tp->t_ticket != NULL);
856 * If we need to update the superblock, then do it now.
858 if (tp->t_flags & XFS_TRANS_SB_DIRTY)
859 xfs_trans_apply_sb_deltas(tp);
860 xfs_trans_apply_dquot_deltas(tp);
862 xfs_log_commit_cil(mp, tp, &commit_lsn, regrant);
864 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
868 * If the transaction needs to be synchronous, then force the
869 * log out now and wait for it.
872 error = xfs_log_force_lsn(mp, commit_lsn, XFS_LOG_SYNC, NULL);
873 XFS_STATS_INC(mp, xs_trans_sync);
875 XFS_STATS_INC(mp, xs_trans_async);
881 xfs_trans_unreserve_and_mod_sb(tp);
884 * It is indeed possible for the transaction to be not dirty but
885 * the dqinfo portion to be. All that means is that we have some
886 * (non-persistent) quota reservations that need to be unreserved.
888 xfs_trans_unreserve_and_mod_dquots(tp);
890 if (regrant && !XLOG_FORCED_SHUTDOWN(mp->m_log))
891 xfs_log_ticket_regrant(mp->m_log, tp->t_ticket);
893 xfs_log_ticket_ungrant(mp->m_log, tp->t_ticket);
896 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
897 xfs_trans_free_items(tp, !!error);
900 XFS_STATS_INC(mp, xs_trans_empty);
906 struct xfs_trans *tp)
908 return __xfs_trans_commit(tp, false);
912 * Unlock all of the transaction's items and free the transaction.
913 * The transaction must not have modified any of its items, because
914 * there is no way to restore them to their previous state.
916 * If the transaction has made a log reservation, make sure to release
921 struct xfs_trans *tp)
923 struct xfs_mount *mp = tp->t_mountp;
924 bool dirty = (tp->t_flags & XFS_TRANS_DIRTY);
926 trace_xfs_trans_cancel(tp, _RET_IP_);
928 if (tp->t_flags & XFS_TRANS_PERM_LOG_RES)
929 xfs_defer_cancel(tp);
932 * See if the caller is relying on us to shut down the
933 * filesystem. This happens in paths where we detect
934 * corruption and decide to give up.
936 if (dirty && !XFS_FORCED_SHUTDOWN(mp)) {
937 XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
938 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
941 if (!dirty && !XFS_FORCED_SHUTDOWN(mp)) {
942 struct xfs_log_item *lip;
944 list_for_each_entry(lip, &tp->t_items, li_trans)
945 ASSERT(!(lip->li_type == XFS_LI_EFD));
948 xfs_trans_unreserve_and_mod_sb(tp);
949 xfs_trans_unreserve_and_mod_dquots(tp);
952 xfs_log_ticket_ungrant(mp->m_log, tp->t_ticket);
956 /* mark this thread as no longer being in a transaction */
957 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
959 xfs_trans_free_items(tp, dirty);
964 * Roll from one trans in the sequence of PERMANENT transactions to
965 * the next: permanent transactions are only flushed out when
966 * committed with xfs_trans_commit(), but we still want as soon
967 * as possible to let chunks of it go to the log. So we commit the
968 * chunk we've been working on and get a new transaction to continue.
972 struct xfs_trans **tpp)
974 struct xfs_trans *trans = *tpp;
975 struct xfs_trans_res tres;
978 trace_xfs_trans_roll(trans, _RET_IP_);
981 * Copy the critical parameters from one trans to the next.
983 tres.tr_logres = trans->t_log_res;
984 tres.tr_logcount = trans->t_log_count;
986 *tpp = xfs_trans_dup(trans);
989 * Commit the current transaction.
990 * If this commit failed, then it'd just unlock those items that
991 * are not marked ihold. That also means that a filesystem shutdown
992 * is in progress. The caller takes the responsibility to cancel
993 * the duplicate transaction that gets returned.
995 error = __xfs_trans_commit(trans, true);
1000 * Reserve space in the log for the next transaction.
1001 * This also pushes items in the "AIL", the list of logged items,
1002 * out to disk if they are taking up space at the tail of the log
1003 * that we want to use. This requires that either nothing be locked
1004 * across this call, or that anything that is locked be logged in
1005 * the prior and the next transactions.
1007 tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
1008 return xfs_trans_reserve(*tpp, &tres, 0, 0);