2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 #include "xfs_types.h"
24 #include "xfs_trans.h"
28 #include "xfs_dmapi.h"
29 #include "xfs_mount.h"
30 #include "xfs_error.h"
31 #include "xfs_da_btree.h"
32 #include "xfs_bmap_btree.h"
33 #include "xfs_alloc_btree.h"
34 #include "xfs_ialloc_btree.h"
35 #include "xfs_dir2_sf.h"
36 #include "xfs_attr_sf.h"
37 #include "xfs_dinode.h"
38 #include "xfs_inode.h"
39 #include "xfs_btree.h"
40 #include "xfs_ialloc.h"
41 #include "xfs_alloc.h"
43 #include "xfs_quota.h"
44 #include "xfs_trans_priv.h"
45 #include "xfs_trans_space.h"
46 #include "xfs_inode_item.h"
49 STATIC void xfs_trans_apply_sb_deltas(xfs_trans_t *);
50 STATIC uint xfs_trans_count_vecs(xfs_trans_t *);
51 STATIC void xfs_trans_fill_vecs(xfs_trans_t *, xfs_log_iovec_t *);
52 STATIC void xfs_trans_uncommit(xfs_trans_t *, uint);
53 STATIC void xfs_trans_committed(xfs_trans_t *, int);
54 STATIC void xfs_trans_chunk_committed(xfs_log_item_chunk_t *, xfs_lsn_t, int);
55 STATIC void xfs_trans_free(xfs_trans_t *);
57 kmem_zone_t *xfs_trans_zone;
61 * Reservation functions here avoid a huge stack in xfs_trans_init
62 * due to register overflow from temporaries in the calculations.
66 xfs_calc_write_reservation(xfs_mount_t *mp)
68 return XFS_CALC_WRITE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
72 xfs_calc_itruncate_reservation(xfs_mount_t *mp)
74 return XFS_CALC_ITRUNCATE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
78 xfs_calc_rename_reservation(xfs_mount_t *mp)
80 return XFS_CALC_RENAME_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
84 xfs_calc_link_reservation(xfs_mount_t *mp)
86 return XFS_CALC_LINK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
90 xfs_calc_remove_reservation(xfs_mount_t *mp)
92 return XFS_CALC_REMOVE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
96 xfs_calc_symlink_reservation(xfs_mount_t *mp)
98 return XFS_CALC_SYMLINK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
102 xfs_calc_create_reservation(xfs_mount_t *mp)
104 return XFS_CALC_CREATE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
108 xfs_calc_mkdir_reservation(xfs_mount_t *mp)
110 return XFS_CALC_MKDIR_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
114 xfs_calc_ifree_reservation(xfs_mount_t *mp)
116 return XFS_CALC_IFREE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
120 xfs_calc_ichange_reservation(xfs_mount_t *mp)
122 return XFS_CALC_ICHANGE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
126 xfs_calc_growdata_reservation(xfs_mount_t *mp)
128 return XFS_CALC_GROWDATA_LOG_RES(mp);
132 xfs_calc_growrtalloc_reservation(xfs_mount_t *mp)
134 return XFS_CALC_GROWRTALLOC_LOG_RES(mp);
138 xfs_calc_growrtzero_reservation(xfs_mount_t *mp)
140 return XFS_CALC_GROWRTZERO_LOG_RES(mp);
144 xfs_calc_growrtfree_reservation(xfs_mount_t *mp)
146 return XFS_CALC_GROWRTFREE_LOG_RES(mp);
150 xfs_calc_swrite_reservation(xfs_mount_t *mp)
152 return XFS_CALC_SWRITE_LOG_RES(mp);
156 xfs_calc_writeid_reservation(xfs_mount_t *mp)
158 return XFS_CALC_WRITEID_LOG_RES(mp);
162 xfs_calc_addafork_reservation(xfs_mount_t *mp)
164 return XFS_CALC_ADDAFORK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
168 xfs_calc_attrinval_reservation(xfs_mount_t *mp)
170 return XFS_CALC_ATTRINVAL_LOG_RES(mp);
174 xfs_calc_attrset_reservation(xfs_mount_t *mp)
176 return XFS_CALC_ATTRSET_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
180 xfs_calc_attrrm_reservation(xfs_mount_t *mp)
182 return XFS_CALC_ATTRRM_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
186 xfs_calc_clear_agi_bucket_reservation(xfs_mount_t *mp)
188 return XFS_CALC_CLEAR_AGI_BUCKET_LOG_RES(mp);
192 * Initialize the precomputed transaction reservation values
193 * in the mount structure.
199 xfs_trans_reservations_t *resp;
201 resp = &(mp->m_reservations);
202 resp->tr_write = xfs_calc_write_reservation(mp);
203 resp->tr_itruncate = xfs_calc_itruncate_reservation(mp);
204 resp->tr_rename = xfs_calc_rename_reservation(mp);
205 resp->tr_link = xfs_calc_link_reservation(mp);
206 resp->tr_remove = xfs_calc_remove_reservation(mp);
207 resp->tr_symlink = xfs_calc_symlink_reservation(mp);
208 resp->tr_create = xfs_calc_create_reservation(mp);
209 resp->tr_mkdir = xfs_calc_mkdir_reservation(mp);
210 resp->tr_ifree = xfs_calc_ifree_reservation(mp);
211 resp->tr_ichange = xfs_calc_ichange_reservation(mp);
212 resp->tr_growdata = xfs_calc_growdata_reservation(mp);
213 resp->tr_swrite = xfs_calc_swrite_reservation(mp);
214 resp->tr_writeid = xfs_calc_writeid_reservation(mp);
215 resp->tr_addafork = xfs_calc_addafork_reservation(mp);
216 resp->tr_attrinval = xfs_calc_attrinval_reservation(mp);
217 resp->tr_attrset = xfs_calc_attrset_reservation(mp);
218 resp->tr_attrrm = xfs_calc_attrrm_reservation(mp);
219 resp->tr_clearagi = xfs_calc_clear_agi_bucket_reservation(mp);
220 resp->tr_growrtalloc = xfs_calc_growrtalloc_reservation(mp);
221 resp->tr_growrtzero = xfs_calc_growrtzero_reservation(mp);
222 resp->tr_growrtfree = xfs_calc_growrtfree_reservation(mp);
226 * This routine is called to allocate a transaction structure.
227 * The type parameter indicates the type of the transaction. These
228 * are enumerated in xfs_trans.h.
230 * Dynamically allocate the transaction structure from the transaction
231 * zone, initialize it, and return it to the caller.
238 xfs_wait_for_freeze(mp, SB_FREEZE_TRANS);
239 return _xfs_trans_alloc(mp, type);
249 atomic_inc(&mp->m_active_trans);
251 tp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
252 tp->t_magic = XFS_TRANS_MAGIC;
255 tp->t_items_free = XFS_LIC_NUM_SLOTS;
256 tp->t_busy_free = XFS_LBC_NUM_SLOTS;
257 xfs_lic_init(&(tp->t_items));
258 XFS_LBC_INIT(&(tp->t_busy));
263 * This is called to create a new transaction which will share the
264 * permanent log reservation of the given transaction. The remaining
265 * unused block and rt extent reservations are also inherited. This
266 * implies that the original transaction is no longer allowed to allocate
267 * blocks. Locks and log items, however, are no inherited. They must
268 * be added to the new transaction explicitly.
276 ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
279 * Initialize the new transaction structure.
281 ntp->t_magic = XFS_TRANS_MAGIC;
282 ntp->t_type = tp->t_type;
283 ntp->t_mountp = tp->t_mountp;
284 ntp->t_items_free = XFS_LIC_NUM_SLOTS;
285 ntp->t_busy_free = XFS_LBC_NUM_SLOTS;
286 xfs_lic_init(&(ntp->t_items));
287 XFS_LBC_INIT(&(ntp->t_busy));
289 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
290 ASSERT(tp->t_ticket != NULL);
292 ntp->t_flags = XFS_TRANS_PERM_LOG_RES | (tp->t_flags & XFS_TRANS_RESERVE);
293 ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
294 ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
295 tp->t_blk_res = tp->t_blk_res_used;
296 ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
297 tp->t_rtx_res = tp->t_rtx_res_used;
298 ntp->t_pflags = tp->t_pflags;
300 XFS_TRANS_DUP_DQINFO(tp->t_mountp, tp, ntp);
302 atomic_inc(&tp->t_mountp->m_active_trans);
307 * This is called to reserve free disk blocks and log space for the
308 * given transaction. This must be done before allocating any resources
309 * within the transaction.
311 * This will return ENOSPC if there are not enough blocks available.
312 * It will sleep waiting for available log space.
313 * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
314 * is used by long running transactions. If any one of the reservations
315 * fails then they will all be backed out.
317 * This does not do quota reservations. That typically is done by the
331 int rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
333 /* Mark this thread as being in a transaction */
334 current_set_flags_nested(&tp->t_pflags, PF_FSTRANS);
337 * Attempt to reserve the needed disk blocks by decrementing
338 * the number needed from the number available. This will
339 * fail if the count would go below zero.
342 error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FDBLOCKS,
343 -((int64_t)blocks), rsvd);
345 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
346 return (XFS_ERROR(ENOSPC));
348 tp->t_blk_res += blocks;
352 * Reserve the log space needed for this transaction.
355 ASSERT((tp->t_log_res == 0) || (tp->t_log_res == logspace));
356 ASSERT((tp->t_log_count == 0) ||
357 (tp->t_log_count == logcount));
358 if (flags & XFS_TRANS_PERM_LOG_RES) {
359 log_flags = XFS_LOG_PERM_RESERV;
360 tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
362 ASSERT(tp->t_ticket == NULL);
363 ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
367 error = xfs_log_reserve(tp->t_mountp, logspace, logcount,
369 XFS_TRANSACTION, log_flags, tp->t_type);
373 tp->t_log_res = logspace;
374 tp->t_log_count = logcount;
378 * Attempt to reserve the needed realtime extents by decrementing
379 * the number needed from the number available. This will
380 * fail if the count would go below zero.
383 error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FREXTENTS,
384 -((int64_t)rtextents), rsvd);
386 error = XFS_ERROR(ENOSPC);
389 tp->t_rtx_res += rtextents;
395 * Error cases jump to one of these labels to undo any
396 * reservations which have already been performed.
400 if (flags & XFS_TRANS_PERM_LOG_RES) {
401 log_flags = XFS_LOG_REL_PERM_RESERV;
405 xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, log_flags);
408 tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
413 (void) xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FDBLOCKS,
414 (int64_t)blocks, rsvd);
418 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
425 * Record the indicated change to the given field for application
426 * to the file system's superblock when the transaction commits.
427 * For now, just store the change in the transaction structure.
429 * Mark the transaction structure to indicate that the superblock
430 * needs to be updated before committing.
432 * Because we may not be keeping track of allocated/free inodes and
433 * used filesystem blocks in the superblock, we do not mark the
434 * superblock dirty in this transaction if we modify these fields.
435 * We still need to update the transaction deltas so that they get
436 * applied to the incore superblock, but we don't want them to
437 * cause the superblock to get locked and logged if these are the
438 * only fields in the superblock that the transaction modifies.
446 uint32_t flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
447 xfs_mount_t *mp = tp->t_mountp;
450 case XFS_TRANS_SB_ICOUNT:
451 tp->t_icount_delta += delta;
452 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
453 flags &= ~XFS_TRANS_SB_DIRTY;
455 case XFS_TRANS_SB_IFREE:
456 tp->t_ifree_delta += delta;
457 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
458 flags &= ~XFS_TRANS_SB_DIRTY;
460 case XFS_TRANS_SB_FDBLOCKS:
462 * Track the number of blocks allocated in the
463 * transaction. Make sure it does not exceed the
467 tp->t_blk_res_used += (uint)-delta;
468 ASSERT(tp->t_blk_res_used <= tp->t_blk_res);
470 tp->t_fdblocks_delta += delta;
471 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
472 flags &= ~XFS_TRANS_SB_DIRTY;
474 case XFS_TRANS_SB_RES_FDBLOCKS:
476 * The allocation has already been applied to the
477 * in-core superblock's counter. This should only
478 * be applied to the on-disk superblock.
481 tp->t_res_fdblocks_delta += delta;
482 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
483 flags &= ~XFS_TRANS_SB_DIRTY;
485 case XFS_TRANS_SB_FREXTENTS:
487 * Track the number of blocks allocated in the
488 * transaction. Make sure it does not exceed the
492 tp->t_rtx_res_used += (uint)-delta;
493 ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
495 tp->t_frextents_delta += delta;
497 case XFS_TRANS_SB_RES_FREXTENTS:
499 * The allocation has already been applied to the
500 * in-core superblock's counter. This should only
501 * be applied to the on-disk superblock.
504 tp->t_res_frextents_delta += delta;
506 case XFS_TRANS_SB_DBLOCKS:
508 tp->t_dblocks_delta += delta;
510 case XFS_TRANS_SB_AGCOUNT:
512 tp->t_agcount_delta += delta;
514 case XFS_TRANS_SB_IMAXPCT:
515 tp->t_imaxpct_delta += delta;
517 case XFS_TRANS_SB_REXTSIZE:
518 tp->t_rextsize_delta += delta;
520 case XFS_TRANS_SB_RBMBLOCKS:
521 tp->t_rbmblocks_delta += delta;
523 case XFS_TRANS_SB_RBLOCKS:
524 tp->t_rblocks_delta += delta;
526 case XFS_TRANS_SB_REXTENTS:
527 tp->t_rextents_delta += delta;
529 case XFS_TRANS_SB_REXTSLOG:
530 tp->t_rextslog_delta += delta;
537 tp->t_flags |= flags;
541 * xfs_trans_apply_sb_deltas() is called from the commit code
542 * to bring the superblock buffer into the current transaction
543 * and modify it as requested by earlier calls to xfs_trans_mod_sb().
545 * For now we just look at each field allowed to change and change
549 xfs_trans_apply_sb_deltas(
556 bp = xfs_trans_getsb(tp, tp->t_mountp, 0);
557 sbp = XFS_BUF_TO_SBP(bp);
560 * Check that superblock mods match the mods made to AGF counters.
562 ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
563 (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
564 tp->t_ag_btree_delta));
567 * Only update the superblock counters if we are logging them
569 if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
570 if (tp->t_icount_delta)
571 be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
572 if (tp->t_ifree_delta)
573 be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
574 if (tp->t_fdblocks_delta)
575 be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
576 if (tp->t_res_fdblocks_delta)
577 be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
580 if (tp->t_frextents_delta)
581 be64_add_cpu(&sbp->sb_frextents, tp->t_frextents_delta);
582 if (tp->t_res_frextents_delta)
583 be64_add_cpu(&sbp->sb_frextents, tp->t_res_frextents_delta);
585 if (tp->t_dblocks_delta) {
586 be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
589 if (tp->t_agcount_delta) {
590 be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
593 if (tp->t_imaxpct_delta) {
594 sbp->sb_imax_pct += tp->t_imaxpct_delta;
597 if (tp->t_rextsize_delta) {
598 be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
601 if (tp->t_rbmblocks_delta) {
602 be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
605 if (tp->t_rblocks_delta) {
606 be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
609 if (tp->t_rextents_delta) {
610 be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
613 if (tp->t_rextslog_delta) {
614 sbp->sb_rextslog += tp->t_rextslog_delta;
620 * Log the whole thing, the fields are noncontiguous.
622 xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
625 * Since all the modifiable fields are contiguous, we
626 * can get away with this.
628 xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
629 offsetof(xfs_dsb_t, sb_frextents) +
630 sizeof(sbp->sb_frextents) - 1);
632 tp->t_mountp->m_super->s_dirt = 1;
636 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations
637 * and apply superblock counter changes to the in-core superblock. The
638 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
639 * applied to the in-core superblock. The idea is that that has already been
642 * This is done efficiently with a single call to xfs_mod_incore_sb_batch().
643 * However, we have to ensure that we only modify each superblock field only
644 * once because the application of the delta values may not be atomic. That can
645 * lead to ENOSPC races occurring if we have two separate modifcations of the
646 * free space counter to put back the entire reservation and then take away
649 * If we are not logging superblock counters, then the inode allocated/free and
650 * used block counts are not updated in the on disk superblock. In this case,
651 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
652 * still need to update the incore superblock with the changes.
655 xfs_trans_unreserve_and_mod_sb(
658 xfs_mod_sb_t msb[14]; /* If you add cases, add entries */
660 xfs_mount_t *mp = tp->t_mountp;
664 int64_t blkdelta = 0;
665 int64_t rtxdelta = 0;
668 rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
670 /* calculate free blocks delta */
671 if (tp->t_blk_res > 0)
672 blkdelta = tp->t_blk_res;
674 if ((tp->t_fdblocks_delta != 0) &&
675 (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
676 (tp->t_flags & XFS_TRANS_SB_DIRTY)))
677 blkdelta += tp->t_fdblocks_delta;
680 msbp->msb_field = XFS_SBS_FDBLOCKS;
681 msbp->msb_delta = blkdelta;
685 /* calculate free realtime extents delta */
686 if (tp->t_rtx_res > 0)
687 rtxdelta = tp->t_rtx_res;
689 if ((tp->t_frextents_delta != 0) &&
690 (tp->t_flags & XFS_TRANS_SB_DIRTY))
691 rtxdelta += tp->t_frextents_delta;
694 msbp->msb_field = XFS_SBS_FREXTENTS;
695 msbp->msb_delta = rtxdelta;
699 /* apply remaining deltas */
701 if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
702 (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
703 if (tp->t_icount_delta != 0) {
704 msbp->msb_field = XFS_SBS_ICOUNT;
705 msbp->msb_delta = tp->t_icount_delta;
708 if (tp->t_ifree_delta != 0) {
709 msbp->msb_field = XFS_SBS_IFREE;
710 msbp->msb_delta = tp->t_ifree_delta;
715 if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
716 if (tp->t_dblocks_delta != 0) {
717 msbp->msb_field = XFS_SBS_DBLOCKS;
718 msbp->msb_delta = tp->t_dblocks_delta;
721 if (tp->t_agcount_delta != 0) {
722 msbp->msb_field = XFS_SBS_AGCOUNT;
723 msbp->msb_delta = tp->t_agcount_delta;
726 if (tp->t_imaxpct_delta != 0) {
727 msbp->msb_field = XFS_SBS_IMAX_PCT;
728 msbp->msb_delta = tp->t_imaxpct_delta;
731 if (tp->t_rextsize_delta != 0) {
732 msbp->msb_field = XFS_SBS_REXTSIZE;
733 msbp->msb_delta = tp->t_rextsize_delta;
736 if (tp->t_rbmblocks_delta != 0) {
737 msbp->msb_field = XFS_SBS_RBMBLOCKS;
738 msbp->msb_delta = tp->t_rbmblocks_delta;
741 if (tp->t_rblocks_delta != 0) {
742 msbp->msb_field = XFS_SBS_RBLOCKS;
743 msbp->msb_delta = tp->t_rblocks_delta;
746 if (tp->t_rextents_delta != 0) {
747 msbp->msb_field = XFS_SBS_REXTENTS;
748 msbp->msb_delta = tp->t_rextents_delta;
751 if (tp->t_rextslog_delta != 0) {
752 msbp->msb_field = XFS_SBS_REXTSLOG;
753 msbp->msb_delta = tp->t_rextslog_delta;
759 * If we need to change anything, do it.
762 error = xfs_mod_incore_sb_batch(tp->t_mountp, msb,
763 (uint)(msbp - msb), rsvd);
772 * Commit the given transaction to the log a/synchronously.
774 * XFS disk error handling mechanism is not based on a typical
775 * transaction abort mechanism. Logically after the filesystem
776 * gets marked 'SHUTDOWN', we can't let any new transactions
777 * be durable - ie. committed to disk - because some metadata might
778 * be inconsistent. In such cases, this returns an error, and the
779 * caller may assume that all locked objects joined to the transaction
780 * have already been unlocked as if the commit had succeeded.
781 * Do not reference the transaction structure after this call.
790 xfs_log_iovec_t *log_vector;
793 xfs_lsn_t commit_lsn;
798 #define XFS_TRANS_LOGVEC_COUNT 16
799 xfs_log_iovec_t log_vector_fast[XFS_TRANS_LOGVEC_COUNT];
806 * Determine whether this commit is releasing a permanent
807 * log reservation or not.
809 if (flags & XFS_TRANS_RELEASE_LOG_RES) {
810 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
811 log_flags = XFS_LOG_REL_PERM_RESERV;
818 * If there is nothing to be logged by the transaction,
819 * then unlock all of the items associated with the
820 * transaction and free the transaction structure.
821 * Also make sure to return any reserved blocks to
825 shutdown = XFS_FORCED_SHUTDOWN(mp) ? EIO : 0;
826 if (!(tp->t_flags & XFS_TRANS_DIRTY) || shutdown) {
827 xfs_trans_unreserve_and_mod_sb(tp);
829 * It is indeed possible for the transaction to be
830 * not dirty but the dqinfo portion to be. All that
831 * means is that we have some (non-persistent) quota
832 * reservations that need to be unreserved.
834 XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(mp, tp);
836 commit_lsn = xfs_log_done(mp, tp->t_ticket,
838 if (commit_lsn == -1 && !shutdown)
839 shutdown = XFS_ERROR(EIO);
841 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
842 xfs_trans_free_items(tp, shutdown? XFS_TRANS_ABORT : 0);
843 xfs_trans_free_busy(tp);
845 XFS_STATS_INC(xs_trans_empty);
848 ASSERT(tp->t_ticket != NULL);
851 * If we need to update the superblock, then do it now.
853 if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
854 xfs_trans_apply_sb_deltas(tp);
856 XFS_TRANS_APPLY_DQUOT_DELTAS(mp, tp);
859 * Ask each log item how many log_vector entries it will
860 * need so we can figure out how many to allocate.
861 * Try to avoid the kmem_alloc() call in the common case
862 * by using a vector from the stack when it fits.
864 nvec = xfs_trans_count_vecs(tp);
866 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
868 } else if (nvec <= XFS_TRANS_LOGVEC_COUNT) {
869 log_vector = log_vector_fast;
871 log_vector = (xfs_log_iovec_t *)kmem_alloc(nvec *
872 sizeof(xfs_log_iovec_t),
877 * Fill in the log_vector and pin the logged items, and
878 * then write the transaction to the log.
880 xfs_trans_fill_vecs(tp, log_vector);
882 error = xfs_log_write(mp, log_vector, nvec, tp->t_ticket, &(tp->t_lsn));
885 * The transaction is committed incore here, and can go out to disk
886 * at any time after this call. However, all the items associated
887 * with the transaction are still locked and pinned in memory.
889 commit_lsn = xfs_log_done(mp, tp->t_ticket, &commit_iclog, log_flags);
891 tp->t_commit_lsn = commit_lsn;
892 if (nvec > XFS_TRANS_LOGVEC_COUNT) {
893 kmem_free(log_vector);
897 * If we got a log write error. Unpin the logitems that we
898 * had pinned, clean up, free trans structure, and return error.
900 if (error || commit_lsn == -1) {
901 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
902 xfs_trans_uncommit(tp, flags|XFS_TRANS_ABORT);
903 return XFS_ERROR(EIO);
907 * Once the transaction has committed, unused
908 * reservations need to be released and changes to
909 * the superblock need to be reflected in the in-core
910 * version. Do that now.
912 xfs_trans_unreserve_and_mod_sb(tp);
914 sync = tp->t_flags & XFS_TRANS_SYNC;
917 * Tell the LM to call the transaction completion routine
918 * when the log write with LSN commit_lsn completes (e.g.
919 * when the transaction commit really hits the on-disk log).
920 * After this call we cannot reference tp, because the call
921 * can happen at any time and the call will free the transaction
922 * structure pointed to by tp. The only case where we call
923 * the completion routine (xfs_trans_committed) directly is
924 * if the log is turned off on a debug kernel or we're
925 * running in simulation mode (the log is explicitly turned
928 tp->t_logcb.cb_func = (void(*)(void*, int))xfs_trans_committed;
929 tp->t_logcb.cb_arg = tp;
932 * We need to pass the iclog buffer which was used for the
933 * transaction commit record into this function, and attach
934 * the callback to it. The callback must be attached before
935 * the items are unlocked to avoid racing with other threads
936 * waiting for an item to unlock.
938 shutdown = xfs_log_notify(mp, commit_iclog, &(tp->t_logcb));
941 * Mark this thread as no longer being in a transaction
943 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
946 * Once all the items of the transaction have been copied
947 * to the in core log and the callback is attached, the
948 * items can be unlocked.
950 * This will free descriptors pointing to items which were
951 * not logged since there is nothing more to do with them.
952 * For items which were logged, we will keep pointers to them
953 * so they can be unpinned after the transaction commits to disk.
954 * This will also stamp each modified meta-data item with
955 * the commit lsn of this transaction for dependency tracking
958 xfs_trans_unlock_items(tp, commit_lsn);
961 * If we detected a log error earlier, finish committing
962 * the transaction now (unpin log items, etc).
964 * Order is critical here, to avoid using the transaction
965 * pointer after its been freed (by xfs_trans_committed
966 * either here now, or as a callback). We cannot do this
967 * step inside xfs_log_notify as was done earlier because
971 xfs_trans_committed(tp, XFS_LI_ABORTED);
974 * Now that the xfs_trans_committed callback has been attached,
975 * and the items are released we can finally allow the iclog to
978 error = xfs_log_release_iclog(mp, commit_iclog);
981 * If the transaction needs to be synchronous, then force the
982 * log out now and wait for it.
986 error = _xfs_log_force(mp, commit_lsn,
987 XFS_LOG_FORCE | XFS_LOG_SYNC,
990 XFS_STATS_INC(xs_trans_sync);
992 XFS_STATS_INC(xs_trans_async);
1000 * Total up the number of log iovecs needed to commit this
1001 * transaction. The transaction itself needs one for the
1002 * transaction header. Ask each dirty item in turn how many
1003 * it needs to get the total.
1006 xfs_trans_count_vecs(
1010 xfs_log_item_desc_t *lidp;
1013 lidp = xfs_trans_first_item(tp);
1014 ASSERT(lidp != NULL);
1016 /* In the non-debug case we need to start bailing out if we
1017 * didn't find a log_item here, return zero and let trans_commit
1023 while (lidp != NULL) {
1025 * Skip items which aren't dirty in this transaction.
1027 if (!(lidp->lid_flags & XFS_LID_DIRTY)) {
1028 lidp = xfs_trans_next_item(tp, lidp);
1031 lidp->lid_size = IOP_SIZE(lidp->lid_item);
1032 nvecs += lidp->lid_size;
1033 lidp = xfs_trans_next_item(tp, lidp);
1040 * Called from the trans_commit code when we notice that
1041 * the filesystem is in the middle of a forced shutdown.
1048 xfs_log_item_desc_t *lidp;
1050 for (lidp = xfs_trans_first_item(tp);
1052 lidp = xfs_trans_next_item(tp, lidp)) {
1054 * Unpin all but those that aren't dirty.
1056 if (lidp->lid_flags & XFS_LID_DIRTY)
1057 IOP_UNPIN_REMOVE(lidp->lid_item, tp);
1060 xfs_trans_unreserve_and_mod_sb(tp);
1061 XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(tp->t_mountp, tp);
1063 xfs_trans_free_items(tp, flags);
1064 xfs_trans_free_busy(tp);
1069 * Fill in the vector with pointers to data to be logged
1070 * by this transaction. The transaction header takes
1071 * the first vector, and then each dirty item takes the
1072 * number of vectors it indicated it needed in xfs_trans_count_vecs().
1074 * As each item fills in the entries it needs, also pin the item
1075 * so that it cannot be flushed out until the log write completes.
1078 xfs_trans_fill_vecs(
1080 xfs_log_iovec_t *log_vector)
1082 xfs_log_item_desc_t *lidp;
1083 xfs_log_iovec_t *vecp;
1087 * Skip over the entry for the transaction header, we'll
1088 * fill that in at the end.
1090 vecp = log_vector + 1; /* pointer arithmetic */
1093 lidp = xfs_trans_first_item(tp);
1094 ASSERT(lidp != NULL);
1095 while (lidp != NULL) {
1097 * Skip items which aren't dirty in this transaction.
1099 if (!(lidp->lid_flags & XFS_LID_DIRTY)) {
1100 lidp = xfs_trans_next_item(tp, lidp);
1104 * The item may be marked dirty but not log anything.
1105 * This can be used to get called when a transaction
1108 if (lidp->lid_size) {
1111 IOP_FORMAT(lidp->lid_item, vecp);
1112 vecp += lidp->lid_size; /* pointer arithmetic */
1113 IOP_PIN(lidp->lid_item);
1114 lidp = xfs_trans_next_item(tp, lidp);
1118 * Now that we've counted the number of items in this
1119 * transaction, fill in the transaction header.
1121 tp->t_header.th_magic = XFS_TRANS_HEADER_MAGIC;
1122 tp->t_header.th_type = tp->t_type;
1123 tp->t_header.th_num_items = nitems;
1124 log_vector->i_addr = (xfs_caddr_t)&tp->t_header;
1125 log_vector->i_len = sizeof(xfs_trans_header_t);
1126 XLOG_VEC_SET_TYPE(log_vector, XLOG_REG_TYPE_TRANSHDR);
1131 * Unlock all of the transaction's items and free the transaction.
1132 * The transaction must not have modified any of its items, because
1133 * there is no way to restore them to their previous state.
1135 * If the transaction has made a log reservation, make sure to release
1145 xfs_log_item_chunk_t *licp;
1146 xfs_log_item_desc_t *lidp;
1147 xfs_log_item_t *lip;
1150 xfs_mount_t *mp = tp->t_mountp;
1153 * See if the caller is being too lazy to figure out if
1154 * the transaction really needs an abort.
1156 if ((flags & XFS_TRANS_ABORT) && !(tp->t_flags & XFS_TRANS_DIRTY))
1157 flags &= ~XFS_TRANS_ABORT;
1159 * See if the caller is relying on us to shut down the
1160 * filesystem. This happens in paths where we detect
1161 * corruption and decide to give up.
1163 if ((tp->t_flags & XFS_TRANS_DIRTY) && !XFS_FORCED_SHUTDOWN(mp)) {
1164 XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
1165 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1168 if (!(flags & XFS_TRANS_ABORT)) {
1169 licp = &(tp->t_items);
1170 while (licp != NULL) {
1171 lidp = licp->lic_descs;
1172 for (i = 0; i < licp->lic_unused; i++, lidp++) {
1173 if (xfs_lic_isfree(licp, i)) {
1177 lip = lidp->lid_item;
1178 if (!XFS_FORCED_SHUTDOWN(mp))
1179 ASSERT(!(lip->li_type == XFS_LI_EFD));
1181 licp = licp->lic_next;
1185 xfs_trans_unreserve_and_mod_sb(tp);
1186 XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(mp, tp);
1189 if (flags & XFS_TRANS_RELEASE_LOG_RES) {
1190 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
1191 log_flags = XFS_LOG_REL_PERM_RESERV;
1195 xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
1198 /* mark this thread as no longer being in a transaction */
1199 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
1201 xfs_trans_free_items(tp, flags);
1202 xfs_trans_free_busy(tp);
1208 * Free the transaction structure. If there is more clean up
1209 * to do when the structure is freed, add it here.
1215 atomic_dec(&tp->t_mountp->m_active_trans);
1216 XFS_TRANS_FREE_DQINFO(tp->t_mountp, tp);
1217 kmem_zone_free(xfs_trans_zone, tp);
1221 * Roll from one trans in the sequence of PERMANENT transactions to
1222 * the next: permanent transactions are only flushed out when
1223 * committed with XFS_TRANS_RELEASE_LOG_RES, but we still want as soon
1224 * as possible to let chunks of it go to the log. So we commit the
1225 * chunk we've been working on and get a new transaction to continue.
1229 struct xfs_trans **tpp,
1230 struct xfs_inode *dp)
1232 struct xfs_trans *trans;
1233 unsigned int logres, count;
1237 * Ensure that the inode is always logged.
1240 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
1243 * Copy the critical parameters from one trans to the next.
1245 logres = trans->t_log_res;
1246 count = trans->t_log_count;
1247 *tpp = xfs_trans_dup(trans);
1250 * Commit the current transaction.
1251 * If this commit failed, then it'd just unlock those items that
1252 * are not marked ihold. That also means that a filesystem shutdown
1253 * is in progress. The caller takes the responsibility to cancel
1254 * the duplicate transaction that gets returned.
1256 error = xfs_trans_commit(trans, 0);
1263 * transaction commit worked ok so we can drop the extra ticket
1264 * reference that we gained in xfs_trans_dup()
1266 xfs_log_ticket_put(trans->t_ticket);
1270 * Reserve space in the log for th next transaction.
1271 * This also pushes items in the "AIL", the list of logged items,
1272 * out to disk if they are taking up space at the tail of the log
1273 * that we want to use. This requires that either nothing be locked
1274 * across this call, or that anything that is locked be logged in
1275 * the prior and the next transactions.
1277 error = xfs_trans_reserve(trans, 0, logres, 0,
1278 XFS_TRANS_PERM_LOG_RES, count);
1280 * Ensure that the inode is in the new transaction and locked.
1285 xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
1286 xfs_trans_ihold(trans, dp);
1291 * THIS SHOULD BE REWRITTEN TO USE xfs_trans_next_item().
1293 * This is typically called by the LM when a transaction has been fully
1294 * committed to disk. It needs to unpin the items which have
1295 * been logged by the transaction and update their positions
1296 * in the AIL if necessary.
1297 * This also gets called when the transactions didn't get written out
1298 * because of an I/O error. Abortflag & XFS_LI_ABORTED is set then.
1300 * Call xfs_trans_chunk_committed() to process the items in
1304 xfs_trans_committed(
1308 xfs_log_item_chunk_t *licp;
1309 xfs_log_item_chunk_t *next_licp;
1310 xfs_log_busy_chunk_t *lbcp;
1311 xfs_log_busy_slot_t *lbsp;
1315 * Call the transaction's completion callback if there
1318 if (tp->t_callback != NULL) {
1319 tp->t_callback(tp, tp->t_callarg);
1323 * Special case the chunk embedded in the transaction.
1325 licp = &(tp->t_items);
1326 if (!(xfs_lic_are_all_free(licp))) {
1327 xfs_trans_chunk_committed(licp, tp->t_lsn, abortflag);
1331 * Process the items in each chunk in turn.
1333 licp = licp->lic_next;
1334 while (licp != NULL) {
1335 ASSERT(!xfs_lic_are_all_free(licp));
1336 xfs_trans_chunk_committed(licp, tp->t_lsn, abortflag);
1337 next_licp = licp->lic_next;
1343 * Clear all the per-AG busy list items listed in this transaction
1346 while (lbcp != NULL) {
1347 for (i = 0, lbsp = lbcp->lbc_busy; i < lbcp->lbc_unused; i++, lbsp++) {
1348 if (!XFS_LBC_ISFREE(lbcp, i)) {
1349 xfs_alloc_clear_busy(tp, lbsp->lbc_ag,
1353 lbcp = lbcp->lbc_next;
1355 xfs_trans_free_busy(tp);
1358 * That's it for the transaction structure. Free it.
1364 * This is called to perform the commit processing for each
1365 * item described by the given chunk.
1367 * The commit processing consists of unlocking items which were
1368 * held locked with the SYNC_UNLOCK attribute, calling the committed
1369 * routine of each logged item, updating the item's position in the AIL
1370 * if necessary, and unpinning each item. If the committed routine
1371 * returns -1, then do nothing further with the item because it
1372 * may have been freed.
1374 * Since items are unlocked when they are copied to the incore
1375 * log, it is possible for two transactions to be completing
1376 * and manipulating the same item simultaneously. The AIL lock
1377 * will protect the lsn field of each item. The value of this
1378 * field can never go backwards.
1380 * We unpin the items after repositioning them in the AIL, because
1381 * otherwise they could be immediately flushed and we'd have to race
1382 * with the flusher trying to pull the item from the AIL as we add it.
1385 xfs_trans_chunk_committed(
1386 xfs_log_item_chunk_t *licp,
1390 xfs_log_item_desc_t *lidp;
1391 xfs_log_item_t *lip;
1395 lidp = licp->lic_descs;
1396 for (i = 0; i < licp->lic_unused; i++, lidp++) {
1397 struct xfs_ail *ailp;
1399 if (xfs_lic_isfree(licp, i)) {
1403 lip = lidp->lid_item;
1405 lip->li_flags |= XFS_LI_ABORTED;
1408 * Send in the ABORTED flag to the COMMITTED routine
1409 * so that it knows whether the transaction was aborted
1412 item_lsn = IOP_COMMITTED(lip, lsn);
1415 * If the committed routine returns -1, make
1416 * no more references to the item.
1418 if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0) {
1423 * If the returned lsn is greater than what it
1424 * contained before, update the location of the
1425 * item in the AIL. If it is not, then do nothing.
1426 * Items can never move backwards in the AIL.
1428 * While the new lsn should usually be greater, it
1429 * is possible that a later transaction completing
1430 * simultaneously with an earlier one using the
1431 * same item could complete first with a higher lsn.
1432 * This would cause the earlier transaction to fail
1435 ailp = lip->li_ailp;
1436 spin_lock(&ailp->xa_lock);
1437 if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0) {
1439 * This will set the item's lsn to item_lsn
1440 * and update the position of the item in
1443 * xfs_trans_ail_update() drops the AIL lock.
1445 xfs_trans_ail_update(ailp, lip, item_lsn);
1447 spin_unlock(&ailp->xa_lock);
1451 * Now that we've repositioned the item in the AIL,
1452 * unpin it so it can be flushed. Pass information
1453 * about buffer stale state down from the log item
1454 * flags, if anyone else stales the buffer we do not
1455 * want to pay any attention to it.
1457 IOP_UNPIN(lip, lidp->lid_flags & XFS_LID_BUF_STALE);