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1/*
2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * Copyright (C) 2010 Red Hat, Inc.
4 * All Rights Reserved.
5 *
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.
9 *
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.
14 *
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
18 */
19#include "xfs.h"
20#include "xfs_fs.h"
21#include "xfs_shared.h"
22#include "xfs_format.h"
23#include "xfs_log_format.h"
24#include "xfs_trans_resv.h"
25#include "xfs_mount.h"
26#include "xfs_inode.h"
27#include "xfs_extent_busy.h"
28#include "xfs_quota.h"
29#include "xfs_trans.h"
30#include "xfs_trans_priv.h"
31#include "xfs_log.h"
32#include "xfs_trace.h"
33#include "xfs_error.h"
34
35kmem_zone_t *xfs_trans_zone;
36kmem_zone_t *xfs_log_item_desc_zone;
37
38#if defined(CONFIG_TRACEPOINTS)
39static void
40xfs_trans_trace_reservations(
41 struct xfs_mount *mp)
42{
43 struct xfs_trans_res resv;
44 struct xfs_trans_res *res;
45 struct xfs_trans_res *end_res;
46 int i;
47
48 res = (struct xfs_trans_res *)M_RES(mp);
49 end_res = (struct xfs_trans_res *)(M_RES(mp) + 1);
50 for (i = 0; res < end_res; i++, res++)
51 trace_xfs_trans_resv_calc(mp, i, res);
52 xfs_log_get_max_trans_res(mp, &resv);
53 trace_xfs_trans_resv_calc(mp, -1, &resv);
54}
55#else
56# define xfs_trans_trace_reservations(mp)
57#endif
58
59/*
60 * Initialize the precomputed transaction reservation values
61 * in the mount structure.
62 */
63void
64xfs_trans_init(
65 struct xfs_mount *mp)
66{
67 xfs_trans_resv_calc(mp, M_RES(mp));
68 xfs_trans_trace_reservations(mp);
69}
70
71/*
72 * Free the transaction structure. If there is more clean up
73 * to do when the structure is freed, add it here.
74 */
75STATIC void
76xfs_trans_free(
77 struct xfs_trans *tp)
78{
79 xfs_extent_busy_sort(&tp->t_busy);
80 xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false);
81
82 atomic_dec(&tp->t_mountp->m_active_trans);
83 if (!(tp->t_flags & XFS_TRANS_NO_WRITECOUNT))
84 sb_end_intwrite(tp->t_mountp->m_super);
85 xfs_trans_free_dqinfo(tp);
86 kmem_zone_free(xfs_trans_zone, tp);
87}
88
89/*
90 * This is called to create a new transaction which will share the
91 * permanent log reservation of the given transaction. The remaining
92 * unused block and rt extent reservations are also inherited. This
93 * implies that the original transaction is no longer allowed to allocate
94 * blocks. Locks and log items, however, are no inherited. They must
95 * be added to the new transaction explicitly.
96 */
97STATIC xfs_trans_t *
98xfs_trans_dup(
99 xfs_trans_t *tp)
100{
101 xfs_trans_t *ntp;
102
103 ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
104
105 /*
106 * Initialize the new transaction structure.
107 */
108 ntp->t_magic = XFS_TRANS_HEADER_MAGIC;
109 ntp->t_mountp = tp->t_mountp;
110 INIT_LIST_HEAD(&ntp->t_items);
111 INIT_LIST_HEAD(&ntp->t_busy);
112
113 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
114 ASSERT(tp->t_ticket != NULL);
115
116 ntp->t_flags = XFS_TRANS_PERM_LOG_RES |
117 (tp->t_flags & XFS_TRANS_RESERVE) |
118 (tp->t_flags & XFS_TRANS_NO_WRITECOUNT);
119 /* We gave our writer reference to the new transaction */
120 tp->t_flags |= XFS_TRANS_NO_WRITECOUNT;
121 ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
122
123 ASSERT(tp->t_blk_res >= tp->t_blk_res_used);
124 ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
125 tp->t_blk_res = tp->t_blk_res_used;
126
127 ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
128 tp->t_rtx_res = tp->t_rtx_res_used;
129 ntp->t_pflags = tp->t_pflags;
130
131 xfs_trans_dup_dqinfo(tp, ntp);
132
133 atomic_inc(&tp->t_mountp->m_active_trans);
134 return ntp;
135}
136
137/*
138 * This is called to reserve free disk blocks and log space for the
139 * given transaction. This must be done before allocating any resources
140 * within the transaction.
141 *
142 * This will return ENOSPC if there are not enough blocks available.
143 * It will sleep waiting for available log space.
144 * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
145 * is used by long running transactions. If any one of the reservations
146 * fails then they will all be backed out.
147 *
148 * This does not do quota reservations. That typically is done by the
149 * caller afterwards.
150 */
151static int
152xfs_trans_reserve(
153 struct xfs_trans *tp,
154 struct xfs_trans_res *resp,
155 uint blocks,
156 uint rtextents)
157{
158 int error = 0;
159 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
160
161 /* Mark this thread as being in a transaction */
162 current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
163
164 /*
165 * Attempt to reserve the needed disk blocks by decrementing
166 * the number needed from the number available. This will
167 * fail if the count would go below zero.
168 */
169 if (blocks > 0) {
170 error = xfs_mod_fdblocks(tp->t_mountp, -((int64_t)blocks), rsvd);
171 if (error != 0) {
172 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
173 return -ENOSPC;
174 }
175 tp->t_blk_res += blocks;
176 }
177
178 /*
179 * Reserve the log space needed for this transaction.
180 */
181 if (resp->tr_logres > 0) {
182 bool permanent = false;
183
184 ASSERT(tp->t_log_res == 0 ||
185 tp->t_log_res == resp->tr_logres);
186 ASSERT(tp->t_log_count == 0 ||
187 tp->t_log_count == resp->tr_logcount);
188
189 if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
190 tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
191 permanent = true;
192 } else {
193 ASSERT(tp->t_ticket == NULL);
194 ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
195 }
196
197 if (tp->t_ticket != NULL) {
198 ASSERT(resp->tr_logflags & XFS_TRANS_PERM_LOG_RES);
199 error = xfs_log_regrant(tp->t_mountp, tp->t_ticket);
200 } else {
201 error = xfs_log_reserve(tp->t_mountp,
202 resp->tr_logres,
203 resp->tr_logcount,
204 &tp->t_ticket, XFS_TRANSACTION,
205 permanent);
206 }
207
208 if (error)
209 goto undo_blocks;
210
211 tp->t_log_res = resp->tr_logres;
212 tp->t_log_count = resp->tr_logcount;
213 }
214
215 /*
216 * Attempt to reserve the needed realtime extents by decrementing
217 * the number needed from the number available. This will
218 * fail if the count would go below zero.
219 */
220 if (rtextents > 0) {
221 error = xfs_mod_frextents(tp->t_mountp, -((int64_t)rtextents));
222 if (error) {
223 error = -ENOSPC;
224 goto undo_log;
225 }
226 tp->t_rtx_res += rtextents;
227 }
228
229 return 0;
230
231 /*
232 * Error cases jump to one of these labels to undo any
233 * reservations which have already been performed.
234 */
235undo_log:
236 if (resp->tr_logres > 0) {
237 xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, false);
238 tp->t_ticket = NULL;
239 tp->t_log_res = 0;
240 tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
241 }
242
243undo_blocks:
244 if (blocks > 0) {
245 xfs_mod_fdblocks(tp->t_mountp, (int64_t)blocks, rsvd);
246 tp->t_blk_res = 0;
247 }
248
249 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
250
251 return error;
252}
253
254int
255xfs_trans_alloc(
256 struct xfs_mount *mp,
257 struct xfs_trans_res *resp,
258 uint blocks,
259 uint rtextents,
260 uint flags,
261 struct xfs_trans **tpp)
262{
263 struct xfs_trans *tp;
264 int error;
265
266 if (!(flags & XFS_TRANS_NO_WRITECOUNT))
267 sb_start_intwrite(mp->m_super);
268
269 WARN_ON(mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
270 atomic_inc(&mp->m_active_trans);
271
272 tp = kmem_zone_zalloc(xfs_trans_zone,
273 (flags & XFS_TRANS_NOFS) ? KM_NOFS : KM_SLEEP);
274 tp->t_magic = XFS_TRANS_HEADER_MAGIC;
275 tp->t_flags = flags;
276 tp->t_mountp = mp;
277 INIT_LIST_HEAD(&tp->t_items);
278 INIT_LIST_HEAD(&tp->t_busy);
279
280 error = xfs_trans_reserve(tp, resp, blocks, rtextents);
281 if (error) {
282 xfs_trans_cancel(tp);
283 return error;
284 }
285
286 *tpp = tp;
287 return 0;
288}
289
290/*
291 * Create an empty transaction with no reservation. This is a defensive
292 * mechanism for routines that query metadata without actually modifying
293 * them -- if the metadata being queried is somehow cross-linked (think a
294 * btree block pointer that points higher in the tree), we risk deadlock.
295 * However, blocks grabbed as part of a transaction can be re-grabbed.
296 * The verifiers will notice the corrupt block and the operation will fail
297 * back to userspace without deadlocking.
298 *
299 * Note the zero-length reservation; this transaction MUST be cancelled
300 * without any dirty data.
301 */
302int
303xfs_trans_alloc_empty(
304 struct xfs_mount *mp,
305 struct xfs_trans **tpp)
306{
307 struct xfs_trans_res resv = {0};
308
309 return xfs_trans_alloc(mp, &resv, 0, 0, XFS_TRANS_NO_WRITECOUNT, tpp);
310}
311
312/*
313 * Record the indicated change to the given field for application
314 * to the file system's superblock when the transaction commits.
315 * For now, just store the change in the transaction structure.
316 *
317 * Mark the transaction structure to indicate that the superblock
318 * needs to be updated before committing.
319 *
320 * Because we may not be keeping track of allocated/free inodes and
321 * used filesystem blocks in the superblock, we do not mark the
322 * superblock dirty in this transaction if we modify these fields.
323 * We still need to update the transaction deltas so that they get
324 * applied to the incore superblock, but we don't want them to
325 * cause the superblock to get locked and logged if these are the
326 * only fields in the superblock that the transaction modifies.
327 */
328void
329xfs_trans_mod_sb(
330 xfs_trans_t *tp,
331 uint field,
332 int64_t delta)
333{
334 uint32_t flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
335 xfs_mount_t *mp = tp->t_mountp;
336
337 switch (field) {
338 case XFS_TRANS_SB_ICOUNT:
339 tp->t_icount_delta += delta;
340 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
341 flags &= ~XFS_TRANS_SB_DIRTY;
342 break;
343 case XFS_TRANS_SB_IFREE:
344 tp->t_ifree_delta += delta;
345 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
346 flags &= ~XFS_TRANS_SB_DIRTY;
347 break;
348 case XFS_TRANS_SB_FDBLOCKS:
349 /*
350 * Track the number of blocks allocated in the transaction.
351 * Make sure it does not exceed the number reserved. If so,
352 * shutdown as this can lead to accounting inconsistency.
353 */
354 if (delta < 0) {
355 tp->t_blk_res_used += (uint)-delta;
356 if (tp->t_blk_res_used > tp->t_blk_res)
357 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
358 }
359 tp->t_fdblocks_delta += delta;
360 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
361 flags &= ~XFS_TRANS_SB_DIRTY;
362 break;
363 case XFS_TRANS_SB_RES_FDBLOCKS:
364 /*
365 * The allocation has already been applied to the
366 * in-core superblock's counter. This should only
367 * be applied to the on-disk superblock.
368 */
369 tp->t_res_fdblocks_delta += delta;
370 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
371 flags &= ~XFS_TRANS_SB_DIRTY;
372 break;
373 case XFS_TRANS_SB_FREXTENTS:
374 /*
375 * Track the number of blocks allocated in the
376 * transaction. Make sure it does not exceed the
377 * number reserved.
378 */
379 if (delta < 0) {
380 tp->t_rtx_res_used += (uint)-delta;
381 ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
382 }
383 tp->t_frextents_delta += delta;
384 break;
385 case XFS_TRANS_SB_RES_FREXTENTS:
386 /*
387 * The allocation has already been applied to the
388 * in-core superblock's counter. This should only
389 * be applied to the on-disk superblock.
390 */
391 ASSERT(delta < 0);
392 tp->t_res_frextents_delta += delta;
393 break;
394 case XFS_TRANS_SB_DBLOCKS:
395 ASSERT(delta > 0);
396 tp->t_dblocks_delta += delta;
397 break;
398 case XFS_TRANS_SB_AGCOUNT:
399 ASSERT(delta > 0);
400 tp->t_agcount_delta += delta;
401 break;
402 case XFS_TRANS_SB_IMAXPCT:
403 tp->t_imaxpct_delta += delta;
404 break;
405 case XFS_TRANS_SB_REXTSIZE:
406 tp->t_rextsize_delta += delta;
407 break;
408 case XFS_TRANS_SB_RBMBLOCKS:
409 tp->t_rbmblocks_delta += delta;
410 break;
411 case XFS_TRANS_SB_RBLOCKS:
412 tp->t_rblocks_delta += delta;
413 break;
414 case XFS_TRANS_SB_REXTENTS:
415 tp->t_rextents_delta += delta;
416 break;
417 case XFS_TRANS_SB_REXTSLOG:
418 tp->t_rextslog_delta += delta;
419 break;
420 default:
421 ASSERT(0);
422 return;
423 }
424
425 tp->t_flags |= flags;
426}
427
428/*
429 * xfs_trans_apply_sb_deltas() is called from the commit code
430 * to bring the superblock buffer into the current transaction
431 * and modify it as requested by earlier calls to xfs_trans_mod_sb().
432 *
433 * For now we just look at each field allowed to change and change
434 * it if necessary.
435 */
436STATIC void
437xfs_trans_apply_sb_deltas(
438 xfs_trans_t *tp)
439{
440 xfs_dsb_t *sbp;
441 xfs_buf_t *bp;
442 int whole = 0;
443
444 bp = xfs_trans_getsb(tp, tp->t_mountp, 0);
445 sbp = XFS_BUF_TO_SBP(bp);
446
447 /*
448 * Check that superblock mods match the mods made to AGF counters.
449 */
450 ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
451 (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
452 tp->t_ag_btree_delta));
453
454 /*
455 * Only update the superblock counters if we are logging them
456 */
457 if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
458 if (tp->t_icount_delta)
459 be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
460 if (tp->t_ifree_delta)
461 be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
462 if (tp->t_fdblocks_delta)
463 be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
464 if (tp->t_res_fdblocks_delta)
465 be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
466 }
467
468 if (tp->t_frextents_delta)
469 be64_add_cpu(&sbp->sb_frextents, tp->t_frextents_delta);
470 if (tp->t_res_frextents_delta)
471 be64_add_cpu(&sbp->sb_frextents, tp->t_res_frextents_delta);
472
473 if (tp->t_dblocks_delta) {
474 be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
475 whole = 1;
476 }
477 if (tp->t_agcount_delta) {
478 be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
479 whole = 1;
480 }
481 if (tp->t_imaxpct_delta) {
482 sbp->sb_imax_pct += tp->t_imaxpct_delta;
483 whole = 1;
484 }
485 if (tp->t_rextsize_delta) {
486 be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
487 whole = 1;
488 }
489 if (tp->t_rbmblocks_delta) {
490 be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
491 whole = 1;
492 }
493 if (tp->t_rblocks_delta) {
494 be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
495 whole = 1;
496 }
497 if (tp->t_rextents_delta) {
498 be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
499 whole = 1;
500 }
501 if (tp->t_rextslog_delta) {
502 sbp->sb_rextslog += tp->t_rextslog_delta;
503 whole = 1;
504 }
505
506 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
507 if (whole)
508 /*
509 * Log the whole thing, the fields are noncontiguous.
510 */
511 xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
512 else
513 /*
514 * Since all the modifiable fields are contiguous, we
515 * can get away with this.
516 */
517 xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
518 offsetof(xfs_dsb_t, sb_frextents) +
519 sizeof(sbp->sb_frextents) - 1);
520}
521
522STATIC int
523xfs_sb_mod8(
524 uint8_t *field,
525 int8_t delta)
526{
527 int8_t counter = *field;
528
529 counter += delta;
530 if (counter < 0) {
531 ASSERT(0);
532 return -EINVAL;
533 }
534 *field = counter;
535 return 0;
536}
537
538STATIC int
539xfs_sb_mod32(
540 uint32_t *field,
541 int32_t delta)
542{
543 int32_t counter = *field;
544
545 counter += delta;
546 if (counter < 0) {
547 ASSERT(0);
548 return -EINVAL;
549 }
550 *field = counter;
551 return 0;
552}
553
554STATIC int
555xfs_sb_mod64(
556 uint64_t *field,
557 int64_t delta)
558{
559 int64_t counter = *field;
560
561 counter += delta;
562 if (counter < 0) {
563 ASSERT(0);
564 return -EINVAL;
565 }
566 *field = counter;
567 return 0;
568}
569
570/*
571 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations
572 * and apply superblock counter changes to the in-core superblock. The
573 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
574 * applied to the in-core superblock. The idea is that that has already been
575 * done.
576 *
577 * If we are not logging superblock counters, then the inode allocated/free and
578 * used block counts are not updated in the on disk superblock. In this case,
579 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
580 * still need to update the incore superblock with the changes.
581 */
582void
583xfs_trans_unreserve_and_mod_sb(
584 struct xfs_trans *tp)
585{
586 struct xfs_mount *mp = tp->t_mountp;
587 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
588 int64_t blkdelta = 0;
589 int64_t rtxdelta = 0;
590 int64_t idelta = 0;
591 int64_t ifreedelta = 0;
592 int error;
593
594 /* calculate deltas */
595 if (tp->t_blk_res > 0)
596 blkdelta = tp->t_blk_res;
597 if ((tp->t_fdblocks_delta != 0) &&
598 (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
599 (tp->t_flags & XFS_TRANS_SB_DIRTY)))
600 blkdelta += tp->t_fdblocks_delta;
601
602 if (tp->t_rtx_res > 0)
603 rtxdelta = tp->t_rtx_res;
604 if ((tp->t_frextents_delta != 0) &&
605 (tp->t_flags & XFS_TRANS_SB_DIRTY))
606 rtxdelta += tp->t_frextents_delta;
607
608 if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
609 (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
610 idelta = tp->t_icount_delta;
611 ifreedelta = tp->t_ifree_delta;
612 }
613
614 /* apply the per-cpu counters */
615 if (blkdelta) {
616 error = xfs_mod_fdblocks(mp, blkdelta, rsvd);
617 if (error)
618 goto out;
619 }
620
621 if (idelta) {
622 error = xfs_mod_icount(mp, idelta);
623 if (error)
624 goto out_undo_fdblocks;
625 }
626
627 if (ifreedelta) {
628 error = xfs_mod_ifree(mp, ifreedelta);
629 if (error)
630 goto out_undo_icount;
631 }
632
633 if (rtxdelta == 0 && !(tp->t_flags & XFS_TRANS_SB_DIRTY))
634 return;
635
636 /* apply remaining deltas */
637 spin_lock(&mp->m_sb_lock);
638 if (rtxdelta) {
639 error = xfs_sb_mod64(&mp->m_sb.sb_frextents, rtxdelta);
640 if (error)
641 goto out_undo_ifree;
642 }
643
644 if (tp->t_dblocks_delta != 0) {
645 error = xfs_sb_mod64(&mp->m_sb.sb_dblocks, tp->t_dblocks_delta);
646 if (error)
647 goto out_undo_frextents;
648 }
649 if (tp->t_agcount_delta != 0) {
650 error = xfs_sb_mod32(&mp->m_sb.sb_agcount, tp->t_agcount_delta);
651 if (error)
652 goto out_undo_dblocks;
653 }
654 if (tp->t_imaxpct_delta != 0) {
655 error = xfs_sb_mod8(&mp->m_sb.sb_imax_pct, tp->t_imaxpct_delta);
656 if (error)
657 goto out_undo_agcount;
658 }
659 if (tp->t_rextsize_delta != 0) {
660 error = xfs_sb_mod32(&mp->m_sb.sb_rextsize,
661 tp->t_rextsize_delta);
662 if (error)
663 goto out_undo_imaxpct;
664 }
665 if (tp->t_rbmblocks_delta != 0) {
666 error = xfs_sb_mod32(&mp->m_sb.sb_rbmblocks,
667 tp->t_rbmblocks_delta);
668 if (error)
669 goto out_undo_rextsize;
670 }
671 if (tp->t_rblocks_delta != 0) {
672 error = xfs_sb_mod64(&mp->m_sb.sb_rblocks, tp->t_rblocks_delta);
673 if (error)
674 goto out_undo_rbmblocks;
675 }
676 if (tp->t_rextents_delta != 0) {
677 error = xfs_sb_mod64(&mp->m_sb.sb_rextents,
678 tp->t_rextents_delta);
679 if (error)
680 goto out_undo_rblocks;
681 }
682 if (tp->t_rextslog_delta != 0) {
683 error = xfs_sb_mod8(&mp->m_sb.sb_rextslog,
684 tp->t_rextslog_delta);
685 if (error)
686 goto out_undo_rextents;
687 }
688 spin_unlock(&mp->m_sb_lock);
689 return;
690
691out_undo_rextents:
692 if (tp->t_rextents_delta)
693 xfs_sb_mod64(&mp->m_sb.sb_rextents, -tp->t_rextents_delta);
694out_undo_rblocks:
695 if (tp->t_rblocks_delta)
696 xfs_sb_mod64(&mp->m_sb.sb_rblocks, -tp->t_rblocks_delta);
697out_undo_rbmblocks:
698 if (tp->t_rbmblocks_delta)
699 xfs_sb_mod32(&mp->m_sb.sb_rbmblocks, -tp->t_rbmblocks_delta);
700out_undo_rextsize:
701 if (tp->t_rextsize_delta)
702 xfs_sb_mod32(&mp->m_sb.sb_rextsize, -tp->t_rextsize_delta);
703out_undo_imaxpct:
704 if (tp->t_rextsize_delta)
705 xfs_sb_mod8(&mp->m_sb.sb_imax_pct, -tp->t_imaxpct_delta);
706out_undo_agcount:
707 if (tp->t_agcount_delta)
708 xfs_sb_mod32(&mp->m_sb.sb_agcount, -tp->t_agcount_delta);
709out_undo_dblocks:
710 if (tp->t_dblocks_delta)
711 xfs_sb_mod64(&mp->m_sb.sb_dblocks, -tp->t_dblocks_delta);
712out_undo_frextents:
713 if (rtxdelta)
714 xfs_sb_mod64(&mp->m_sb.sb_frextents, -rtxdelta);
715out_undo_ifree:
716 spin_unlock(&mp->m_sb_lock);
717 if (ifreedelta)
718 xfs_mod_ifree(mp, -ifreedelta);
719out_undo_icount:
720 if (idelta)
721 xfs_mod_icount(mp, -idelta);
722out_undo_fdblocks:
723 if (blkdelta)
724 xfs_mod_fdblocks(mp, -blkdelta, rsvd);
725out:
726 ASSERT(error == 0);
727 return;
728}
729
730/*
731 * Add the given log item to the transaction's list of log items.
732 *
733 * The log item will now point to its new descriptor with its li_desc field.
734 */
735void
736xfs_trans_add_item(
737 struct xfs_trans *tp,
738 struct xfs_log_item *lip)
739{
740 struct xfs_log_item_desc *lidp;
741
742 ASSERT(lip->li_mountp == tp->t_mountp);
743 ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
744
745 lidp = kmem_zone_zalloc(xfs_log_item_desc_zone, KM_SLEEP | KM_NOFS);
746
747 lidp->lid_item = lip;
748 lidp->lid_flags = 0;
749 list_add_tail(&lidp->lid_trans, &tp->t_items);
750
751 lip->li_desc = lidp;
752}
753
754STATIC void
755xfs_trans_free_item_desc(
756 struct xfs_log_item_desc *lidp)
757{
758 list_del_init(&lidp->lid_trans);
759 kmem_zone_free(xfs_log_item_desc_zone, lidp);
760}
761
762/*
763 * Unlink and free the given descriptor.
764 */
765void
766xfs_trans_del_item(
767 struct xfs_log_item *lip)
768{
769 xfs_trans_free_item_desc(lip->li_desc);
770 lip->li_desc = NULL;
771}
772
773/*
774 * Unlock all of the items of a transaction and free all the descriptors
775 * of that transaction.
776 */
777void
778xfs_trans_free_items(
779 struct xfs_trans *tp,
780 xfs_lsn_t commit_lsn,
781 bool abort)
782{
783 struct xfs_log_item_desc *lidp, *next;
784
785 list_for_each_entry_safe(lidp, next, &tp->t_items, lid_trans) {
786 struct xfs_log_item *lip = lidp->lid_item;
787
788 lip->li_desc = NULL;
789
790 if (commit_lsn != NULLCOMMITLSN)
791 lip->li_ops->iop_committing(lip, commit_lsn);
792 if (abort)
793 lip->li_flags |= XFS_LI_ABORTED;
794 lip->li_ops->iop_unlock(lip);
795
796 xfs_trans_free_item_desc(lidp);
797 }
798}
799
800static inline void
801xfs_log_item_batch_insert(
802 struct xfs_ail *ailp,
803 struct xfs_ail_cursor *cur,
804 struct xfs_log_item **log_items,
805 int nr_items,
806 xfs_lsn_t commit_lsn)
807{
808 int i;
809
810 spin_lock(&ailp->ail_lock);
811 /* xfs_trans_ail_update_bulk drops ailp->ail_lock */
812 xfs_trans_ail_update_bulk(ailp, cur, log_items, nr_items, commit_lsn);
813
814 for (i = 0; i < nr_items; i++) {
815 struct xfs_log_item *lip = log_items[i];
816
817 lip->li_ops->iop_unpin(lip, 0);
818 }
819}
820
821/*
822 * Bulk operation version of xfs_trans_committed that takes a log vector of
823 * items to insert into the AIL. This uses bulk AIL insertion techniques to
824 * minimise lock traffic.
825 *
826 * If we are called with the aborted flag set, it is because a log write during
827 * a CIL checkpoint commit has failed. In this case, all the items in the
828 * checkpoint have already gone through iop_commited and iop_unlock, which
829 * means that checkpoint commit abort handling is treated exactly the same
830 * as an iclog write error even though we haven't started any IO yet. Hence in
831 * this case all we need to do is iop_committed processing, followed by an
832 * iop_unpin(aborted) call.
833 *
834 * The AIL cursor is used to optimise the insert process. If commit_lsn is not
835 * at the end of the AIL, the insert cursor avoids the need to walk
836 * the AIL to find the insertion point on every xfs_log_item_batch_insert()
837 * call. This saves a lot of needless list walking and is a net win, even
838 * though it slightly increases that amount of AIL lock traffic to set it up
839 * and tear it down.
840 */
841void
842xfs_trans_committed_bulk(
843 struct xfs_ail *ailp,
844 struct xfs_log_vec *log_vector,
845 xfs_lsn_t commit_lsn,
846 int aborted)
847{
848#define LOG_ITEM_BATCH_SIZE 32
849 struct xfs_log_item *log_items[LOG_ITEM_BATCH_SIZE];
850 struct xfs_log_vec *lv;
851 struct xfs_ail_cursor cur;
852 int i = 0;
853
854 spin_lock(&ailp->ail_lock);
855 xfs_trans_ail_cursor_last(ailp, &cur, commit_lsn);
856 spin_unlock(&ailp->ail_lock);
857
858 /* unpin all the log items */
859 for (lv = log_vector; lv; lv = lv->lv_next ) {
860 struct xfs_log_item *lip = lv->lv_item;
861 xfs_lsn_t item_lsn;
862
863 if (aborted)
864 lip->li_flags |= XFS_LI_ABORTED;
865 item_lsn = lip->li_ops->iop_committed(lip, commit_lsn);
866
867 /* item_lsn of -1 means the item needs no further processing */
868 if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
869 continue;
870
871 /*
872 * if we are aborting the operation, no point in inserting the
873 * object into the AIL as we are in a shutdown situation.
874 */
875 if (aborted) {
876 ASSERT(XFS_FORCED_SHUTDOWN(ailp->ail_mount));
877 lip->li_ops->iop_unpin(lip, 1);
878 continue;
879 }
880
881 if (item_lsn != commit_lsn) {
882
883 /*
884 * Not a bulk update option due to unusual item_lsn.
885 * Push into AIL immediately, rechecking the lsn once
886 * we have the ail lock. Then unpin the item. This does
887 * not affect the AIL cursor the bulk insert path is
888 * using.
889 */
890 spin_lock(&ailp->ail_lock);
891 if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0)
892 xfs_trans_ail_update(ailp, lip, item_lsn);
893 else
894 spin_unlock(&ailp->ail_lock);
895 lip->li_ops->iop_unpin(lip, 0);
896 continue;
897 }
898
899 /* Item is a candidate for bulk AIL insert. */
900 log_items[i++] = lv->lv_item;
901 if (i >= LOG_ITEM_BATCH_SIZE) {
902 xfs_log_item_batch_insert(ailp, &cur, log_items,
903 LOG_ITEM_BATCH_SIZE, commit_lsn);
904 i = 0;
905 }
906 }
907
908 /* make sure we insert the remainder! */
909 if (i)
910 xfs_log_item_batch_insert(ailp, &cur, log_items, i, commit_lsn);
911
912 spin_lock(&ailp->ail_lock);
913 xfs_trans_ail_cursor_done(&cur);
914 spin_unlock(&ailp->ail_lock);
915}
916
917/*
918 * Commit the given transaction to the log.
919 *
920 * XFS disk error handling mechanism is not based on a typical
921 * transaction abort mechanism. Logically after the filesystem
922 * gets marked 'SHUTDOWN', we can't let any new transactions
923 * be durable - ie. committed to disk - because some metadata might
924 * be inconsistent. In such cases, this returns an error, and the
925 * caller may assume that all locked objects joined to the transaction
926 * have already been unlocked as if the commit had succeeded.
927 * Do not reference the transaction structure after this call.
928 */
929static int
930__xfs_trans_commit(
931 struct xfs_trans *tp,
932 bool regrant)
933{
934 struct xfs_mount *mp = tp->t_mountp;
935 xfs_lsn_t commit_lsn = -1;
936 int error = 0;
937 int sync = tp->t_flags & XFS_TRANS_SYNC;
938
939 /*
940 * If there is nothing to be logged by the transaction,
941 * then unlock all of the items associated with the
942 * transaction and free the transaction structure.
943 * Also make sure to return any reserved blocks to
944 * the free pool.
945 */
946 if (!(tp->t_flags & XFS_TRANS_DIRTY))
947 goto out_unreserve;
948
949 if (XFS_FORCED_SHUTDOWN(mp)) {
950 error = -EIO;
951 goto out_unreserve;
952 }
953
954 ASSERT(tp->t_ticket != NULL);
955
956 /*
957 * If we need to update the superblock, then do it now.
958 */
959 if (tp->t_flags & XFS_TRANS_SB_DIRTY)
960 xfs_trans_apply_sb_deltas(tp);
961 xfs_trans_apply_dquot_deltas(tp);
962
963 xfs_log_commit_cil(mp, tp, &commit_lsn, regrant);
964
965 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
966 xfs_trans_free(tp);
967
968 /*
969 * If the transaction needs to be synchronous, then force the
970 * log out now and wait for it.
971 */
972 if (sync) {
973 error = xfs_log_force_lsn(mp, commit_lsn, XFS_LOG_SYNC, NULL);
974 XFS_STATS_INC(mp, xs_trans_sync);
975 } else {
976 XFS_STATS_INC(mp, xs_trans_async);
977 }
978
979 return error;
980
981out_unreserve:
982 xfs_trans_unreserve_and_mod_sb(tp);
983
984 /*
985 * It is indeed possible for the transaction to be not dirty but
986 * the dqinfo portion to be. All that means is that we have some
987 * (non-persistent) quota reservations that need to be unreserved.
988 */
989 xfs_trans_unreserve_and_mod_dquots(tp);
990 if (tp->t_ticket) {
991 commit_lsn = xfs_log_done(mp, tp->t_ticket, NULL, regrant);
992 if (commit_lsn == -1 && !error)
993 error = -EIO;
994 }
995 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
996 xfs_trans_free_items(tp, NULLCOMMITLSN, !!error);
997 xfs_trans_free(tp);
998
999 XFS_STATS_INC(mp, xs_trans_empty);
1000 return error;
1001}
1002
1003int
1004xfs_trans_commit(
1005 struct xfs_trans *tp)
1006{
1007 return __xfs_trans_commit(tp, false);
1008}
1009
1010/*
1011 * Unlock all of the transaction's items and free the transaction.
1012 * The transaction must not have modified any of its items, because
1013 * there is no way to restore them to their previous state.
1014 *
1015 * If the transaction has made a log reservation, make sure to release
1016 * it as well.
1017 */
1018void
1019xfs_trans_cancel(
1020 struct xfs_trans *tp)
1021{
1022 struct xfs_mount *mp = tp->t_mountp;
1023 bool dirty = (tp->t_flags & XFS_TRANS_DIRTY);
1024
1025 /*
1026 * See if the caller is relying on us to shut down the
1027 * filesystem. This happens in paths where we detect
1028 * corruption and decide to give up.
1029 */
1030 if (dirty && !XFS_FORCED_SHUTDOWN(mp)) {
1031 XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
1032 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1033 }
1034#ifdef DEBUG
1035 if (!dirty && !XFS_FORCED_SHUTDOWN(mp)) {
1036 struct xfs_log_item_desc *lidp;
1037
1038 list_for_each_entry(lidp, &tp->t_items, lid_trans)
1039 ASSERT(!(lidp->lid_item->li_type == XFS_LI_EFD));
1040 }
1041#endif
1042 xfs_trans_unreserve_and_mod_sb(tp);
1043 xfs_trans_unreserve_and_mod_dquots(tp);
1044
1045 if (tp->t_ticket)
1046 xfs_log_done(mp, tp->t_ticket, NULL, false);
1047
1048 /* mark this thread as no longer being in a transaction */
1049 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
1050
1051 xfs_trans_free_items(tp, NULLCOMMITLSN, dirty);
1052 xfs_trans_free(tp);
1053}
1054
1055/*
1056 * Roll from one trans in the sequence of PERMANENT transactions to
1057 * the next: permanent transactions are only flushed out when
1058 * committed with xfs_trans_commit(), but we still want as soon
1059 * as possible to let chunks of it go to the log. So we commit the
1060 * chunk we've been working on and get a new transaction to continue.
1061 */
1062int
1063xfs_trans_roll(
1064 struct xfs_trans **tpp)
1065{
1066 struct xfs_trans *trans = *tpp;
1067 struct xfs_trans_res tres;
1068 int error;
1069
1070 /*
1071 * Copy the critical parameters from one trans to the next.
1072 */
1073 tres.tr_logres = trans->t_log_res;
1074 tres.tr_logcount = trans->t_log_count;
1075
1076 *tpp = xfs_trans_dup(trans);
1077
1078 /*
1079 * Commit the current transaction.
1080 * If this commit failed, then it'd just unlock those items that
1081 * are not marked ihold. That also means that a filesystem shutdown
1082 * is in progress. The caller takes the responsibility to cancel
1083 * the duplicate transaction that gets returned.
1084 */
1085 error = __xfs_trans_commit(trans, true);
1086 if (error)
1087 return error;
1088
1089 /*
1090 * Reserve space in the log for the next transaction.
1091 * This also pushes items in the "AIL", the list of logged items,
1092 * out to disk if they are taking up space at the tail of the log
1093 * that we want to use. This requires that either nothing be locked
1094 * across this call, or that anything that is locked be logged in
1095 * the prior and the next transactions.
1096 */
1097 tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
1098 return xfs_trans_reserve(*tpp, &tres, 0, 0);
1099}
1/*
2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * Copyright (C) 2010 Red Hat, Inc.
4 * All Rights Reserved.
5 *
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.
9 *
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.
14 *
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
18 */
19#include "xfs.h"
20#include "xfs_fs.h"
21#include "xfs_shared.h"
22#include "xfs_format.h"
23#include "xfs_log_format.h"
24#include "xfs_trans_resv.h"
25#include "xfs_mount.h"
26#include "xfs_inode.h"
27#include "xfs_extent_busy.h"
28#include "xfs_quota.h"
29#include "xfs_trans.h"
30#include "xfs_trans_priv.h"
31#include "xfs_log.h"
32#include "xfs_trace.h"
33#include "xfs_error.h"
34
35kmem_zone_t *xfs_trans_zone;
36kmem_zone_t *xfs_log_item_desc_zone;
37
38/*
39 * Initialize the precomputed transaction reservation values
40 * in the mount structure.
41 */
42void
43xfs_trans_init(
44 struct xfs_mount *mp)
45{
46 xfs_trans_resv_calc(mp, M_RES(mp));
47}
48
49/*
50 * This routine is called to allocate a transaction structure.
51 * The type parameter indicates the type of the transaction. These
52 * are enumerated in xfs_trans.h.
53 *
54 * Dynamically allocate the transaction structure from the transaction
55 * zone, initialize it, and return it to the caller.
56 */
57xfs_trans_t *
58xfs_trans_alloc(
59 xfs_mount_t *mp,
60 uint type)
61{
62 xfs_trans_t *tp;
63
64 sb_start_intwrite(mp->m_super);
65 tp = _xfs_trans_alloc(mp, type, KM_SLEEP);
66 tp->t_flags |= XFS_TRANS_FREEZE_PROT;
67 return tp;
68}
69
70xfs_trans_t *
71_xfs_trans_alloc(
72 xfs_mount_t *mp,
73 uint type,
74 xfs_km_flags_t memflags)
75{
76 xfs_trans_t *tp;
77
78 WARN_ON(mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
79 atomic_inc(&mp->m_active_trans);
80
81 tp = kmem_zone_zalloc(xfs_trans_zone, memflags);
82 tp->t_magic = XFS_TRANS_HEADER_MAGIC;
83 tp->t_type = type;
84 tp->t_mountp = mp;
85 INIT_LIST_HEAD(&tp->t_items);
86 INIT_LIST_HEAD(&tp->t_busy);
87 return tp;
88}
89
90/*
91 * Free the transaction structure. If there is more clean up
92 * to do when the structure is freed, add it here.
93 */
94STATIC void
95xfs_trans_free(
96 struct xfs_trans *tp)
97{
98 xfs_extent_busy_sort(&tp->t_busy);
99 xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false);
100
101 atomic_dec(&tp->t_mountp->m_active_trans);
102 if (tp->t_flags & XFS_TRANS_FREEZE_PROT)
103 sb_end_intwrite(tp->t_mountp->m_super);
104 xfs_trans_free_dqinfo(tp);
105 kmem_zone_free(xfs_trans_zone, tp);
106}
107
108/*
109 * This is called to create a new transaction which will share the
110 * permanent log reservation of the given transaction. The remaining
111 * unused block and rt extent reservations are also inherited. This
112 * implies that the original transaction is no longer allowed to allocate
113 * blocks. Locks and log items, however, are no inherited. They must
114 * be added to the new transaction explicitly.
115 */
116STATIC xfs_trans_t *
117xfs_trans_dup(
118 xfs_trans_t *tp)
119{
120 xfs_trans_t *ntp;
121
122 ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
123
124 /*
125 * Initialize the new transaction structure.
126 */
127 ntp->t_magic = XFS_TRANS_HEADER_MAGIC;
128 ntp->t_type = tp->t_type;
129 ntp->t_mountp = tp->t_mountp;
130 INIT_LIST_HEAD(&ntp->t_items);
131 INIT_LIST_HEAD(&ntp->t_busy);
132
133 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
134 ASSERT(tp->t_ticket != NULL);
135
136 ntp->t_flags = XFS_TRANS_PERM_LOG_RES |
137 (tp->t_flags & XFS_TRANS_RESERVE) |
138 (tp->t_flags & XFS_TRANS_FREEZE_PROT);
139 /* We gave our writer reference to the new transaction */
140 tp->t_flags &= ~XFS_TRANS_FREEZE_PROT;
141 ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
142 ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
143 tp->t_blk_res = tp->t_blk_res_used;
144 ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
145 tp->t_rtx_res = tp->t_rtx_res_used;
146 ntp->t_pflags = tp->t_pflags;
147
148 xfs_trans_dup_dqinfo(tp, ntp);
149
150 atomic_inc(&tp->t_mountp->m_active_trans);
151 return ntp;
152}
153
154/*
155 * This is called to reserve free disk blocks and log space for the
156 * given transaction. This must be done before allocating any resources
157 * within the transaction.
158 *
159 * This will return ENOSPC if there are not enough blocks available.
160 * It will sleep waiting for available log space.
161 * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
162 * is used by long running transactions. If any one of the reservations
163 * fails then they will all be backed out.
164 *
165 * This does not do quota reservations. That typically is done by the
166 * caller afterwards.
167 */
168int
169xfs_trans_reserve(
170 struct xfs_trans *tp,
171 struct xfs_trans_res *resp,
172 uint blocks,
173 uint rtextents)
174{
175 int error = 0;
176 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
177
178 /* Mark this thread as being in a transaction */
179 current_set_flags_nested(&tp->t_pflags, PF_FSTRANS);
180
181 /*
182 * Attempt to reserve the needed disk blocks by decrementing
183 * the number needed from the number available. This will
184 * fail if the count would go below zero.
185 */
186 if (blocks > 0) {
187 error = xfs_mod_fdblocks(tp->t_mountp, -((int64_t)blocks), rsvd);
188 if (error != 0) {
189 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
190 return -ENOSPC;
191 }
192 tp->t_blk_res += blocks;
193 }
194
195 /*
196 * Reserve the log space needed for this transaction.
197 */
198 if (resp->tr_logres > 0) {
199 bool permanent = false;
200
201 ASSERT(tp->t_log_res == 0 ||
202 tp->t_log_res == resp->tr_logres);
203 ASSERT(tp->t_log_count == 0 ||
204 tp->t_log_count == resp->tr_logcount);
205
206 if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
207 tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
208 permanent = true;
209 } else {
210 ASSERT(tp->t_ticket == NULL);
211 ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
212 }
213
214 if (tp->t_ticket != NULL) {
215 ASSERT(resp->tr_logflags & XFS_TRANS_PERM_LOG_RES);
216 error = xfs_log_regrant(tp->t_mountp, tp->t_ticket);
217 } else {
218 error = xfs_log_reserve(tp->t_mountp,
219 resp->tr_logres,
220 resp->tr_logcount,
221 &tp->t_ticket, XFS_TRANSACTION,
222 permanent, tp->t_type);
223 }
224
225 if (error)
226 goto undo_blocks;
227
228 tp->t_log_res = resp->tr_logres;
229 tp->t_log_count = resp->tr_logcount;
230 }
231
232 /*
233 * Attempt to reserve the needed realtime extents by decrementing
234 * the number needed from the number available. This will
235 * fail if the count would go below zero.
236 */
237 if (rtextents > 0) {
238 error = xfs_mod_frextents(tp->t_mountp, -((int64_t)rtextents));
239 if (error) {
240 error = -ENOSPC;
241 goto undo_log;
242 }
243 tp->t_rtx_res += rtextents;
244 }
245
246 return 0;
247
248 /*
249 * Error cases jump to one of these labels to undo any
250 * reservations which have already been performed.
251 */
252undo_log:
253 if (resp->tr_logres > 0) {
254 xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, false);
255 tp->t_ticket = NULL;
256 tp->t_log_res = 0;
257 tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
258 }
259
260undo_blocks:
261 if (blocks > 0) {
262 xfs_mod_fdblocks(tp->t_mountp, -((int64_t)blocks), rsvd);
263 tp->t_blk_res = 0;
264 }
265
266 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
267
268 return error;
269}
270
271/*
272 * Record the indicated change to the given field for application
273 * to the file system's superblock when the transaction commits.
274 * For now, just store the change in the transaction structure.
275 *
276 * Mark the transaction structure to indicate that the superblock
277 * needs to be updated before committing.
278 *
279 * Because we may not be keeping track of allocated/free inodes and
280 * used filesystem blocks in the superblock, we do not mark the
281 * superblock dirty in this transaction if we modify these fields.
282 * We still need to update the transaction deltas so that they get
283 * applied to the incore superblock, but we don't want them to
284 * cause the superblock to get locked and logged if these are the
285 * only fields in the superblock that the transaction modifies.
286 */
287void
288xfs_trans_mod_sb(
289 xfs_trans_t *tp,
290 uint field,
291 int64_t delta)
292{
293 uint32_t flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
294 xfs_mount_t *mp = tp->t_mountp;
295
296 switch (field) {
297 case XFS_TRANS_SB_ICOUNT:
298 tp->t_icount_delta += delta;
299 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
300 flags &= ~XFS_TRANS_SB_DIRTY;
301 break;
302 case XFS_TRANS_SB_IFREE:
303 tp->t_ifree_delta += delta;
304 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
305 flags &= ~XFS_TRANS_SB_DIRTY;
306 break;
307 case XFS_TRANS_SB_FDBLOCKS:
308 /*
309 * Track the number of blocks allocated in the
310 * transaction. Make sure it does not exceed the
311 * number reserved.
312 */
313 if (delta < 0) {
314 tp->t_blk_res_used += (uint)-delta;
315 ASSERT(tp->t_blk_res_used <= tp->t_blk_res);
316 }
317 tp->t_fdblocks_delta += delta;
318 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
319 flags &= ~XFS_TRANS_SB_DIRTY;
320 break;
321 case XFS_TRANS_SB_RES_FDBLOCKS:
322 /*
323 * The allocation has already been applied to the
324 * in-core superblock's counter. This should only
325 * be applied to the on-disk superblock.
326 */
327 ASSERT(delta < 0);
328 tp->t_res_fdblocks_delta += delta;
329 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
330 flags &= ~XFS_TRANS_SB_DIRTY;
331 break;
332 case XFS_TRANS_SB_FREXTENTS:
333 /*
334 * Track the number of blocks allocated in the
335 * transaction. Make sure it does not exceed the
336 * number reserved.
337 */
338 if (delta < 0) {
339 tp->t_rtx_res_used += (uint)-delta;
340 ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
341 }
342 tp->t_frextents_delta += delta;
343 break;
344 case XFS_TRANS_SB_RES_FREXTENTS:
345 /*
346 * The allocation has already been applied to the
347 * in-core superblock's counter. This should only
348 * be applied to the on-disk superblock.
349 */
350 ASSERT(delta < 0);
351 tp->t_res_frextents_delta += delta;
352 break;
353 case XFS_TRANS_SB_DBLOCKS:
354 ASSERT(delta > 0);
355 tp->t_dblocks_delta += delta;
356 break;
357 case XFS_TRANS_SB_AGCOUNT:
358 ASSERT(delta > 0);
359 tp->t_agcount_delta += delta;
360 break;
361 case XFS_TRANS_SB_IMAXPCT:
362 tp->t_imaxpct_delta += delta;
363 break;
364 case XFS_TRANS_SB_REXTSIZE:
365 tp->t_rextsize_delta += delta;
366 break;
367 case XFS_TRANS_SB_RBMBLOCKS:
368 tp->t_rbmblocks_delta += delta;
369 break;
370 case XFS_TRANS_SB_RBLOCKS:
371 tp->t_rblocks_delta += delta;
372 break;
373 case XFS_TRANS_SB_REXTENTS:
374 tp->t_rextents_delta += delta;
375 break;
376 case XFS_TRANS_SB_REXTSLOG:
377 tp->t_rextslog_delta += delta;
378 break;
379 default:
380 ASSERT(0);
381 return;
382 }
383
384 tp->t_flags |= flags;
385}
386
387/*
388 * xfs_trans_apply_sb_deltas() is called from the commit code
389 * to bring the superblock buffer into the current transaction
390 * and modify it as requested by earlier calls to xfs_trans_mod_sb().
391 *
392 * For now we just look at each field allowed to change and change
393 * it if necessary.
394 */
395STATIC void
396xfs_trans_apply_sb_deltas(
397 xfs_trans_t *tp)
398{
399 xfs_dsb_t *sbp;
400 xfs_buf_t *bp;
401 int whole = 0;
402
403 bp = xfs_trans_getsb(tp, tp->t_mountp, 0);
404 sbp = XFS_BUF_TO_SBP(bp);
405
406 /*
407 * Check that superblock mods match the mods made to AGF counters.
408 */
409 ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
410 (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
411 tp->t_ag_btree_delta));
412
413 /*
414 * Only update the superblock counters if we are logging them
415 */
416 if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
417 if (tp->t_icount_delta)
418 be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
419 if (tp->t_ifree_delta)
420 be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
421 if (tp->t_fdblocks_delta)
422 be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
423 if (tp->t_res_fdblocks_delta)
424 be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
425 }
426
427 if (tp->t_frextents_delta)
428 be64_add_cpu(&sbp->sb_frextents, tp->t_frextents_delta);
429 if (tp->t_res_frextents_delta)
430 be64_add_cpu(&sbp->sb_frextents, tp->t_res_frextents_delta);
431
432 if (tp->t_dblocks_delta) {
433 be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
434 whole = 1;
435 }
436 if (tp->t_agcount_delta) {
437 be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
438 whole = 1;
439 }
440 if (tp->t_imaxpct_delta) {
441 sbp->sb_imax_pct += tp->t_imaxpct_delta;
442 whole = 1;
443 }
444 if (tp->t_rextsize_delta) {
445 be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
446 whole = 1;
447 }
448 if (tp->t_rbmblocks_delta) {
449 be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
450 whole = 1;
451 }
452 if (tp->t_rblocks_delta) {
453 be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
454 whole = 1;
455 }
456 if (tp->t_rextents_delta) {
457 be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
458 whole = 1;
459 }
460 if (tp->t_rextslog_delta) {
461 sbp->sb_rextslog += tp->t_rextslog_delta;
462 whole = 1;
463 }
464
465 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
466 if (whole)
467 /*
468 * Log the whole thing, the fields are noncontiguous.
469 */
470 xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
471 else
472 /*
473 * Since all the modifiable fields are contiguous, we
474 * can get away with this.
475 */
476 xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
477 offsetof(xfs_dsb_t, sb_frextents) +
478 sizeof(sbp->sb_frextents) - 1);
479}
480
481STATIC int
482xfs_sb_mod8(
483 uint8_t *field,
484 int8_t delta)
485{
486 int8_t counter = *field;
487
488 counter += delta;
489 if (counter < 0) {
490 ASSERT(0);
491 return -EINVAL;
492 }
493 *field = counter;
494 return 0;
495}
496
497STATIC int
498xfs_sb_mod32(
499 uint32_t *field,
500 int32_t delta)
501{
502 int32_t counter = *field;
503
504 counter += delta;
505 if (counter < 0) {
506 ASSERT(0);
507 return -EINVAL;
508 }
509 *field = counter;
510 return 0;
511}
512
513STATIC int
514xfs_sb_mod64(
515 uint64_t *field,
516 int64_t delta)
517{
518 int64_t counter = *field;
519
520 counter += delta;
521 if (counter < 0) {
522 ASSERT(0);
523 return -EINVAL;
524 }
525 *field = counter;
526 return 0;
527}
528
529/*
530 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations
531 * and apply superblock counter changes to the in-core superblock. The
532 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
533 * applied to the in-core superblock. The idea is that that has already been
534 * done.
535 *
536 * If we are not logging superblock counters, then the inode allocated/free and
537 * used block counts are not updated in the on disk superblock. In this case,
538 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
539 * still need to update the incore superblock with the changes.
540 */
541void
542xfs_trans_unreserve_and_mod_sb(
543 struct xfs_trans *tp)
544{
545 struct xfs_mount *mp = tp->t_mountp;
546 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
547 int64_t blkdelta = 0;
548 int64_t rtxdelta = 0;
549 int64_t idelta = 0;
550 int64_t ifreedelta = 0;
551 int error;
552
553 /* calculate deltas */
554 if (tp->t_blk_res > 0)
555 blkdelta = tp->t_blk_res;
556 if ((tp->t_fdblocks_delta != 0) &&
557 (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
558 (tp->t_flags & XFS_TRANS_SB_DIRTY)))
559 blkdelta += tp->t_fdblocks_delta;
560
561 if (tp->t_rtx_res > 0)
562 rtxdelta = tp->t_rtx_res;
563 if ((tp->t_frextents_delta != 0) &&
564 (tp->t_flags & XFS_TRANS_SB_DIRTY))
565 rtxdelta += tp->t_frextents_delta;
566
567 if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
568 (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
569 idelta = tp->t_icount_delta;
570 ifreedelta = tp->t_ifree_delta;
571 }
572
573 /* apply the per-cpu counters */
574 if (blkdelta) {
575 error = xfs_mod_fdblocks(mp, blkdelta, rsvd);
576 if (error)
577 goto out;
578 }
579
580 if (idelta) {
581 error = xfs_mod_icount(mp, idelta);
582 if (error)
583 goto out_undo_fdblocks;
584 }
585
586 if (ifreedelta) {
587 error = xfs_mod_ifree(mp, ifreedelta);
588 if (error)
589 goto out_undo_icount;
590 }
591
592 if (rtxdelta == 0 && !(tp->t_flags & XFS_TRANS_SB_DIRTY))
593 return;
594
595 /* apply remaining deltas */
596 spin_lock(&mp->m_sb_lock);
597 if (rtxdelta) {
598 error = xfs_sb_mod64(&mp->m_sb.sb_frextents, rtxdelta);
599 if (error)
600 goto out_undo_ifree;
601 }
602
603 if (tp->t_dblocks_delta != 0) {
604 error = xfs_sb_mod64(&mp->m_sb.sb_dblocks, tp->t_dblocks_delta);
605 if (error)
606 goto out_undo_frextents;
607 }
608 if (tp->t_agcount_delta != 0) {
609 error = xfs_sb_mod32(&mp->m_sb.sb_agcount, tp->t_agcount_delta);
610 if (error)
611 goto out_undo_dblocks;
612 }
613 if (tp->t_imaxpct_delta != 0) {
614 error = xfs_sb_mod8(&mp->m_sb.sb_imax_pct, tp->t_imaxpct_delta);
615 if (error)
616 goto out_undo_agcount;
617 }
618 if (tp->t_rextsize_delta != 0) {
619 error = xfs_sb_mod32(&mp->m_sb.sb_rextsize,
620 tp->t_rextsize_delta);
621 if (error)
622 goto out_undo_imaxpct;
623 }
624 if (tp->t_rbmblocks_delta != 0) {
625 error = xfs_sb_mod32(&mp->m_sb.sb_rbmblocks,
626 tp->t_rbmblocks_delta);
627 if (error)
628 goto out_undo_rextsize;
629 }
630 if (tp->t_rblocks_delta != 0) {
631 error = xfs_sb_mod64(&mp->m_sb.sb_rblocks, tp->t_rblocks_delta);
632 if (error)
633 goto out_undo_rbmblocks;
634 }
635 if (tp->t_rextents_delta != 0) {
636 error = xfs_sb_mod64(&mp->m_sb.sb_rextents,
637 tp->t_rextents_delta);
638 if (error)
639 goto out_undo_rblocks;
640 }
641 if (tp->t_rextslog_delta != 0) {
642 error = xfs_sb_mod8(&mp->m_sb.sb_rextslog,
643 tp->t_rextslog_delta);
644 if (error)
645 goto out_undo_rextents;
646 }
647 spin_unlock(&mp->m_sb_lock);
648 return;
649
650out_undo_rextents:
651 if (tp->t_rextents_delta)
652 xfs_sb_mod64(&mp->m_sb.sb_rextents, -tp->t_rextents_delta);
653out_undo_rblocks:
654 if (tp->t_rblocks_delta)
655 xfs_sb_mod64(&mp->m_sb.sb_rblocks, -tp->t_rblocks_delta);
656out_undo_rbmblocks:
657 if (tp->t_rbmblocks_delta)
658 xfs_sb_mod32(&mp->m_sb.sb_rbmblocks, -tp->t_rbmblocks_delta);
659out_undo_rextsize:
660 if (tp->t_rextsize_delta)
661 xfs_sb_mod32(&mp->m_sb.sb_rextsize, -tp->t_rextsize_delta);
662out_undo_imaxpct:
663 if (tp->t_rextsize_delta)
664 xfs_sb_mod8(&mp->m_sb.sb_imax_pct, -tp->t_imaxpct_delta);
665out_undo_agcount:
666 if (tp->t_agcount_delta)
667 xfs_sb_mod32(&mp->m_sb.sb_agcount, -tp->t_agcount_delta);
668out_undo_dblocks:
669 if (tp->t_dblocks_delta)
670 xfs_sb_mod64(&mp->m_sb.sb_dblocks, -tp->t_dblocks_delta);
671out_undo_frextents:
672 if (rtxdelta)
673 xfs_sb_mod64(&mp->m_sb.sb_frextents, -rtxdelta);
674out_undo_ifree:
675 spin_unlock(&mp->m_sb_lock);
676 if (ifreedelta)
677 xfs_mod_ifree(mp, -ifreedelta);
678out_undo_icount:
679 if (idelta)
680 xfs_mod_icount(mp, -idelta);
681out_undo_fdblocks:
682 if (blkdelta)
683 xfs_mod_fdblocks(mp, -blkdelta, rsvd);
684out:
685 ASSERT(error == 0);
686 return;
687}
688
689/*
690 * Add the given log item to the transaction's list of log items.
691 *
692 * The log item will now point to its new descriptor with its li_desc field.
693 */
694void
695xfs_trans_add_item(
696 struct xfs_trans *tp,
697 struct xfs_log_item *lip)
698{
699 struct xfs_log_item_desc *lidp;
700
701 ASSERT(lip->li_mountp == tp->t_mountp);
702 ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
703
704 lidp = kmem_zone_zalloc(xfs_log_item_desc_zone, KM_SLEEP | KM_NOFS);
705
706 lidp->lid_item = lip;
707 lidp->lid_flags = 0;
708 list_add_tail(&lidp->lid_trans, &tp->t_items);
709
710 lip->li_desc = lidp;
711}
712
713STATIC void
714xfs_trans_free_item_desc(
715 struct xfs_log_item_desc *lidp)
716{
717 list_del_init(&lidp->lid_trans);
718 kmem_zone_free(xfs_log_item_desc_zone, lidp);
719}
720
721/*
722 * Unlink and free the given descriptor.
723 */
724void
725xfs_trans_del_item(
726 struct xfs_log_item *lip)
727{
728 xfs_trans_free_item_desc(lip->li_desc);
729 lip->li_desc = NULL;
730}
731
732/*
733 * Unlock all of the items of a transaction and free all the descriptors
734 * of that transaction.
735 */
736void
737xfs_trans_free_items(
738 struct xfs_trans *tp,
739 xfs_lsn_t commit_lsn,
740 bool abort)
741{
742 struct xfs_log_item_desc *lidp, *next;
743
744 list_for_each_entry_safe(lidp, next, &tp->t_items, lid_trans) {
745 struct xfs_log_item *lip = lidp->lid_item;
746
747 lip->li_desc = NULL;
748
749 if (commit_lsn != NULLCOMMITLSN)
750 lip->li_ops->iop_committing(lip, commit_lsn);
751 if (abort)
752 lip->li_flags |= XFS_LI_ABORTED;
753 lip->li_ops->iop_unlock(lip);
754
755 xfs_trans_free_item_desc(lidp);
756 }
757}
758
759static inline void
760xfs_log_item_batch_insert(
761 struct xfs_ail *ailp,
762 struct xfs_ail_cursor *cur,
763 struct xfs_log_item **log_items,
764 int nr_items,
765 xfs_lsn_t commit_lsn)
766{
767 int i;
768
769 spin_lock(&ailp->xa_lock);
770 /* xfs_trans_ail_update_bulk drops ailp->xa_lock */
771 xfs_trans_ail_update_bulk(ailp, cur, log_items, nr_items, commit_lsn);
772
773 for (i = 0; i < nr_items; i++) {
774 struct xfs_log_item *lip = log_items[i];
775
776 lip->li_ops->iop_unpin(lip, 0);
777 }
778}
779
780/*
781 * Bulk operation version of xfs_trans_committed that takes a log vector of
782 * items to insert into the AIL. This uses bulk AIL insertion techniques to
783 * minimise lock traffic.
784 *
785 * If we are called with the aborted flag set, it is because a log write during
786 * a CIL checkpoint commit has failed. In this case, all the items in the
787 * checkpoint have already gone through iop_commited and iop_unlock, which
788 * means that checkpoint commit abort handling is treated exactly the same
789 * as an iclog write error even though we haven't started any IO yet. Hence in
790 * this case all we need to do is iop_committed processing, followed by an
791 * iop_unpin(aborted) call.
792 *
793 * The AIL cursor is used to optimise the insert process. If commit_lsn is not
794 * at the end of the AIL, the insert cursor avoids the need to walk
795 * the AIL to find the insertion point on every xfs_log_item_batch_insert()
796 * call. This saves a lot of needless list walking and is a net win, even
797 * though it slightly increases that amount of AIL lock traffic to set it up
798 * and tear it down.
799 */
800void
801xfs_trans_committed_bulk(
802 struct xfs_ail *ailp,
803 struct xfs_log_vec *log_vector,
804 xfs_lsn_t commit_lsn,
805 int aborted)
806{
807#define LOG_ITEM_BATCH_SIZE 32
808 struct xfs_log_item *log_items[LOG_ITEM_BATCH_SIZE];
809 struct xfs_log_vec *lv;
810 struct xfs_ail_cursor cur;
811 int i = 0;
812
813 spin_lock(&ailp->xa_lock);
814 xfs_trans_ail_cursor_last(ailp, &cur, commit_lsn);
815 spin_unlock(&ailp->xa_lock);
816
817 /* unpin all the log items */
818 for (lv = log_vector; lv; lv = lv->lv_next ) {
819 struct xfs_log_item *lip = lv->lv_item;
820 xfs_lsn_t item_lsn;
821
822 if (aborted)
823 lip->li_flags |= XFS_LI_ABORTED;
824 item_lsn = lip->li_ops->iop_committed(lip, commit_lsn);
825
826 /* item_lsn of -1 means the item needs no further processing */
827 if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
828 continue;
829
830 /*
831 * if we are aborting the operation, no point in inserting the
832 * object into the AIL as we are in a shutdown situation.
833 */
834 if (aborted) {
835 ASSERT(XFS_FORCED_SHUTDOWN(ailp->xa_mount));
836 lip->li_ops->iop_unpin(lip, 1);
837 continue;
838 }
839
840 if (item_lsn != commit_lsn) {
841
842 /*
843 * Not a bulk update option due to unusual item_lsn.
844 * Push into AIL immediately, rechecking the lsn once
845 * we have the ail lock. Then unpin the item. This does
846 * not affect the AIL cursor the bulk insert path is
847 * using.
848 */
849 spin_lock(&ailp->xa_lock);
850 if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0)
851 xfs_trans_ail_update(ailp, lip, item_lsn);
852 else
853 spin_unlock(&ailp->xa_lock);
854 lip->li_ops->iop_unpin(lip, 0);
855 continue;
856 }
857
858 /* Item is a candidate for bulk AIL insert. */
859 log_items[i++] = lv->lv_item;
860 if (i >= LOG_ITEM_BATCH_SIZE) {
861 xfs_log_item_batch_insert(ailp, &cur, log_items,
862 LOG_ITEM_BATCH_SIZE, commit_lsn);
863 i = 0;
864 }
865 }
866
867 /* make sure we insert the remainder! */
868 if (i)
869 xfs_log_item_batch_insert(ailp, &cur, log_items, i, commit_lsn);
870
871 spin_lock(&ailp->xa_lock);
872 xfs_trans_ail_cursor_done(&cur);
873 spin_unlock(&ailp->xa_lock);
874}
875
876/*
877 * Commit the given transaction to the log.
878 *
879 * XFS disk error handling mechanism is not based on a typical
880 * transaction abort mechanism. Logically after the filesystem
881 * gets marked 'SHUTDOWN', we can't let any new transactions
882 * be durable - ie. committed to disk - because some metadata might
883 * be inconsistent. In such cases, this returns an error, and the
884 * caller may assume that all locked objects joined to the transaction
885 * have already been unlocked as if the commit had succeeded.
886 * Do not reference the transaction structure after this call.
887 */
888static int
889__xfs_trans_commit(
890 struct xfs_trans *tp,
891 bool regrant)
892{
893 struct xfs_mount *mp = tp->t_mountp;
894 xfs_lsn_t commit_lsn = -1;
895 int error = 0;
896 int sync = tp->t_flags & XFS_TRANS_SYNC;
897
898 /*
899 * If there is nothing to be logged by the transaction,
900 * then unlock all of the items associated with the
901 * transaction and free the transaction structure.
902 * Also make sure to return any reserved blocks to
903 * the free pool.
904 */
905 if (!(tp->t_flags & XFS_TRANS_DIRTY))
906 goto out_unreserve;
907
908 if (XFS_FORCED_SHUTDOWN(mp)) {
909 error = -EIO;
910 goto out_unreserve;
911 }
912
913 ASSERT(tp->t_ticket != NULL);
914
915 /*
916 * If we need to update the superblock, then do it now.
917 */
918 if (tp->t_flags & XFS_TRANS_SB_DIRTY)
919 xfs_trans_apply_sb_deltas(tp);
920 xfs_trans_apply_dquot_deltas(tp);
921
922 xfs_log_commit_cil(mp, tp, &commit_lsn, regrant);
923
924 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
925 xfs_trans_free(tp);
926
927 /*
928 * If the transaction needs to be synchronous, then force the
929 * log out now and wait for it.
930 */
931 if (sync) {
932 error = _xfs_log_force_lsn(mp, commit_lsn, XFS_LOG_SYNC, NULL);
933 XFS_STATS_INC(mp, xs_trans_sync);
934 } else {
935 XFS_STATS_INC(mp, xs_trans_async);
936 }
937
938 return error;
939
940out_unreserve:
941 xfs_trans_unreserve_and_mod_sb(tp);
942
943 /*
944 * It is indeed possible for the transaction to be not dirty but
945 * the dqinfo portion to be. All that means is that we have some
946 * (non-persistent) quota reservations that need to be unreserved.
947 */
948 xfs_trans_unreserve_and_mod_dquots(tp);
949 if (tp->t_ticket) {
950 commit_lsn = xfs_log_done(mp, tp->t_ticket, NULL, regrant);
951 if (commit_lsn == -1 && !error)
952 error = -EIO;
953 }
954 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
955 xfs_trans_free_items(tp, NULLCOMMITLSN, !!error);
956 xfs_trans_free(tp);
957
958 XFS_STATS_INC(mp, xs_trans_empty);
959 return error;
960}
961
962int
963xfs_trans_commit(
964 struct xfs_trans *tp)
965{
966 return __xfs_trans_commit(tp, false);
967}
968
969/*
970 * Unlock all of the transaction's items and free the transaction.
971 * The transaction must not have modified any of its items, because
972 * there is no way to restore them to their previous state.
973 *
974 * If the transaction has made a log reservation, make sure to release
975 * it as well.
976 */
977void
978xfs_trans_cancel(
979 struct xfs_trans *tp)
980{
981 struct xfs_mount *mp = tp->t_mountp;
982 bool dirty = (tp->t_flags & XFS_TRANS_DIRTY);
983
984 /*
985 * See if the caller is relying on us to shut down the
986 * filesystem. This happens in paths where we detect
987 * corruption and decide to give up.
988 */
989 if (dirty && !XFS_FORCED_SHUTDOWN(mp)) {
990 XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
991 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
992 }
993#ifdef DEBUG
994 if (!dirty && !XFS_FORCED_SHUTDOWN(mp)) {
995 struct xfs_log_item_desc *lidp;
996
997 list_for_each_entry(lidp, &tp->t_items, lid_trans)
998 ASSERT(!(lidp->lid_item->li_type == XFS_LI_EFD));
999 }
1000#endif
1001 xfs_trans_unreserve_and_mod_sb(tp);
1002 xfs_trans_unreserve_and_mod_dquots(tp);
1003
1004 if (tp->t_ticket)
1005 xfs_log_done(mp, tp->t_ticket, NULL, false);
1006
1007 /* mark this thread as no longer being in a transaction */
1008 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
1009
1010 xfs_trans_free_items(tp, NULLCOMMITLSN, dirty);
1011 xfs_trans_free(tp);
1012}
1013
1014/*
1015 * Roll from one trans in the sequence of PERMANENT transactions to
1016 * the next: permanent transactions are only flushed out when
1017 * committed with xfs_trans_commit(), but we still want as soon
1018 * as possible to let chunks of it go to the log. So we commit the
1019 * chunk we've been working on and get a new transaction to continue.
1020 */
1021int
1022__xfs_trans_roll(
1023 struct xfs_trans **tpp,
1024 struct xfs_inode *dp,
1025 int *committed)
1026{
1027 struct xfs_trans *trans;
1028 struct xfs_trans_res tres;
1029 int error;
1030
1031 *committed = 0;
1032
1033 /*
1034 * Ensure that the inode is always logged.
1035 */
1036 trans = *tpp;
1037 if (dp)
1038 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
1039
1040 /*
1041 * Copy the critical parameters from one trans to the next.
1042 */
1043 tres.tr_logres = trans->t_log_res;
1044 tres.tr_logcount = trans->t_log_count;
1045 *tpp = xfs_trans_dup(trans);
1046
1047 /*
1048 * Commit the current transaction.
1049 * If this commit failed, then it'd just unlock those items that
1050 * are not marked ihold. That also means that a filesystem shutdown
1051 * is in progress. The caller takes the responsibility to cancel
1052 * the duplicate transaction that gets returned.
1053 */
1054 error = __xfs_trans_commit(trans, true);
1055 if (error)
1056 return error;
1057
1058 *committed = 1;
1059 trans = *tpp;
1060
1061 /*
1062 * Reserve space in the log for th next transaction.
1063 * This also pushes items in the "AIL", the list of logged items,
1064 * out to disk if they are taking up space at the tail of the log
1065 * that we want to use. This requires that either nothing be locked
1066 * across this call, or that anything that is locked be logged in
1067 * the prior and the next transactions.
1068 */
1069 tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
1070 error = xfs_trans_reserve(trans, &tres, 0, 0);
1071 /*
1072 * Ensure that the inode is in the new transaction and locked.
1073 */
1074 if (error)
1075 return error;
1076
1077 if (dp)
1078 xfs_trans_ijoin(trans, dp, 0);
1079 return 0;
1080}
1081
1082int
1083xfs_trans_roll(
1084 struct xfs_trans **tpp,
1085 struct xfs_inode *dp)
1086{
1087 int committed;
1088 return __xfs_trans_roll(tpp, dp, &committed);
1089}