1 // SPDX-License-Identifier: GPL-2.0 1
2 /*
3 * Copyright (c) 2000-2003,2005 Silicon Graphi
4 * Copyright (C) 2010 Red Hat, Inc.
5 * All Rights Reserved.
6 */
7 #include "xfs.h"
8 #include "xfs_fs.h"
9 #include "xfs_shared.h"
10 #include "xfs_format.h"
11 #include "xfs_log_format.h"
12 #include "xfs_trans_resv.h"
13 #include "xfs_mount.h"
14 #include "xfs_extent_busy.h"
15 #include "xfs_quota.h"
16 #include "xfs_trans.h"
17 #include "xfs_trans_priv.h"
18 #include "xfs_log.h"
19 #include "xfs_log_priv.h"
20 #include "xfs_trace.h"
21 #include "xfs_error.h"
22 #include "xfs_defer.h"
23 #include "xfs_inode.h"
24 #include "xfs_dquot_item.h"
25 #include "xfs_dquot.h"
26 #include "xfs_icache.h"
27 #include "xfs_rtbitmap.h"
28
29 struct kmem_cache *xfs_trans_cache;
30
31 #if defined(CONFIG_TRACEPOINTS)
32 static void
33 xfs_trans_trace_reservations(
34 struct xfs_mount *mp)
35 {
36 struct xfs_trans_res *res;
37 struct xfs_trans_res *end_res;
38 int i;
39
40 res = (struct xfs_trans_res *)M_RES(mp
41 end_res = (struct xfs_trans_res *)(M_R
42 for (i = 0; res < end_res; i++, res++)
43 trace_xfs_trans_resv_calc(mp,
44 }
45 #else
46 # define xfs_trans_trace_reservations(mp)
47 #endif
48
49 /*
50 * Initialize the precomputed transaction rese
51 * in the mount structure.
52 */
53 void
54 xfs_trans_init(
55 struct xfs_mount *mp)
56 {
57 xfs_trans_resv_calc(mp, M_RES(mp));
58 xfs_trans_trace_reservations(mp);
59 }
60
61 /*
62 * Free the transaction structure. If there i
63 * to do when the structure is freed, add it h
64 */
65 STATIC void
66 xfs_trans_free(
67 struct xfs_trans *tp)
68 {
69 xfs_extent_busy_sort(&tp->t_busy);
70 xfs_extent_busy_clear(tp->t_mountp, &t
71
72 trace_xfs_trans_free(tp, _RET_IP_);
73 xfs_trans_clear_context(tp);
74 if (!(tp->t_flags & XFS_TRANS_NO_WRITE
75 sb_end_intwrite(tp->t_mountp->
76 xfs_trans_free_dqinfo(tp);
77 kmem_cache_free(xfs_trans_cache, tp);
78 }
79
80 /*
81 * This is called to create a new transaction
82 * permanent log reservation of the given tran
83 * unused block and rt extent reservations are
84 * implies that the original transaction is no
85 * blocks. Locks and log items, however, are
86 * be added to the new transaction explicitly.
87 */
88 STATIC struct xfs_trans *
89 xfs_trans_dup(
90 struct xfs_trans *tp)
91 {
92 struct xfs_trans *ntp;
93
94 trace_xfs_trans_dup(tp, _RET_IP_);
95
96 ntp = kmem_cache_zalloc(xfs_trans_cach
97
98 /*
99 * Initialize the new transaction stru
100 */
101 ntp->t_magic = XFS_TRANS_HEADER_MAGIC;
102 ntp->t_mountp = tp->t_mountp;
103 INIT_LIST_HEAD(&ntp->t_items);
104 INIT_LIST_HEAD(&ntp->t_busy);
105 INIT_LIST_HEAD(&ntp->t_dfops);
106 ntp->t_highest_agno = NULLAGNUMBER;
107
108 ASSERT(tp->t_flags & XFS_TRANS_PERM_LO
109 ASSERT(tp->t_ticket != NULL);
110
111 ntp->t_flags = XFS_TRANS_PERM_LOG_RES
112 (tp->t_flags & XFS_TRAN
113 (tp->t_flags & XFS_TRAN
114 (tp->t_flags & XFS_TRAN
115 /* We gave our writer reference to the
116 tp->t_flags |= XFS_TRANS_NO_WRITECOUNT
117 ntp->t_ticket = xfs_log_ticket_get(tp-
118
119 ASSERT(tp->t_blk_res >= tp->t_blk_res_
120 ntp->t_blk_res = tp->t_blk_res - tp->t
121 tp->t_blk_res = tp->t_blk_res_used;
122
123 ntp->t_rtx_res = tp->t_rtx_res - tp->t
124 tp->t_rtx_res = tp->t_rtx_res_used;
125
126 xfs_trans_switch_context(tp, ntp);
127
128 /* move deferred ops over to the new t
129 xfs_defer_move(ntp, tp);
130
131 xfs_trans_dup_dqinfo(tp, ntp);
132 return ntp;
133 }
134
135 /*
136 * This is called to reserve free disk blocks
137 * given transaction. This must be done befor
138 * within the transaction.
139 *
140 * This will return ENOSPC if there are not en
141 * It will sleep waiting for available log spa
142 * The only valid value for the flags paramete
143 * is used by long running transactions. If a
144 * fails then they will all be backed out.
145 *
146 * This does not do quota reservations. That t
147 * caller afterwards.
148 */
149 static int
150 xfs_trans_reserve(
151 struct xfs_trans *tp,
152 struct xfs_trans_res *resp,
153 uint blocks,
154 uint rtextents)
155 {
156 struct xfs_mount *mp = tp->t_mo
157 int error = 0;
158 bool rsvd = (tp->t_
159
160 /*
161 * Attempt to reserve the needed disk
162 * the number needed from the number a
163 * fail if the count would go below ze
164 */
165 if (blocks > 0) {
166 error = xfs_dec_fdblocks(mp, b
167 if (error != 0)
168 return -ENOSPC;
169 tp->t_blk_res += blocks;
170 }
171
172 /*
173 * Reserve the log space needed for th
174 */
175 if (resp->tr_logres > 0) {
176 bool permanent = false;
177
178 ASSERT(tp->t_log_res == 0 ||
179 tp->t_log_res == resp->
180 ASSERT(tp->t_log_count == 0 ||
181 tp->t_log_count == resp
182
183 if (resp->tr_logflags & XFS_TR
184 tp->t_flags |= XFS_TRA
185 permanent = true;
186 } else {
187 ASSERT(tp->t_ticket ==
188 ASSERT(!(tp->t_flags &
189 }
190
191 if (tp->t_ticket != NULL) {
192 ASSERT(resp->tr_logfla
193 error = xfs_log_regran
194 } else {
195 error = xfs_log_reserv
196
197
198 }
199
200 if (error)
201 goto undo_blocks;
202
203 tp->t_log_res = resp->tr_logre
204 tp->t_log_count = resp->tr_log
205 }
206
207 /*
208 * Attempt to reserve the needed realt
209 * the number needed from the number a
210 * fail if the count would go below ze
211 */
212 if (rtextents > 0) {
213 error = xfs_dec_frextents(mp,
214 if (error) {
215 error = -ENOSPC;
216 goto undo_log;
217 }
218 tp->t_rtx_res += rtextents;
219 }
220
221 return 0;
222
223 /*
224 * Error cases jump to one of these la
225 * reservations which have already bee
226 */
227 undo_log:
228 if (resp->tr_logres > 0) {
229 xfs_log_ticket_ungrant(mp->m_l
230 tp->t_ticket = NULL;
231 tp->t_log_res = 0;
232 tp->t_flags &= ~XFS_TRANS_PERM
233 }
234
235 undo_blocks:
236 if (blocks > 0) {
237 xfs_add_fdblocks(mp, blocks);
238 tp->t_blk_res = 0;
239 }
240 return error;
241 }
242
243 int
244 xfs_trans_alloc(
245 struct xfs_mount *mp,
246 struct xfs_trans_res *resp,
247 uint blocks,
248 uint rtextents,
249 uint flags,
250 struct xfs_trans **tpp)
251 {
252 struct xfs_trans *tp;
253 bool want_retry = t
254 int error;
255
256 /*
257 * Allocate the handle before we do ou
258 * GFP_NOFS allocation context so that
259 * by doing GFP_KERNEL allocations ins
260 */
261 retry:
262 tp = kmem_cache_zalloc(xfs_trans_cache
263 if (!(flags & XFS_TRANS_NO_WRITECOUNT)
264 sb_start_intwrite(mp->m_super)
265 xfs_trans_set_context(tp);
266
267 /*
268 * Zero-reservation ("empty") transact
269 * they're allowed to run while we're
270 */
271 WARN_ON(resp->tr_logres > 0 &&
272 mp->m_super->s_writers.frozen
273 ASSERT(!(flags & XFS_TRANS_RES_FDBLKS)
274 xfs_has_lazysbcount(mp));
275
276 tp->t_magic = XFS_TRANS_HEADER_MAGIC;
277 tp->t_flags = flags;
278 tp->t_mountp = mp;
279 INIT_LIST_HEAD(&tp->t_items);
280 INIT_LIST_HEAD(&tp->t_busy);
281 INIT_LIST_HEAD(&tp->t_dfops);
282 tp->t_highest_agno = NULLAGNUMBER;
283
284 error = xfs_trans_reserve(tp, resp, bl
285 if (error == -ENOSPC && want_retry) {
286 xfs_trans_cancel(tp);
287
288 /*
289 * We weren't able to reserve
290 * Flush the other speculative
291 * Do not perform a synchronou
292 * other locks.
293 */
294 error = xfs_blockgc_flush_all(
295 if (error)
296 return error;
297 want_retry = false;
298 goto retry;
299 }
300 if (error) {
301 xfs_trans_cancel(tp);
302 return error;
303 }
304
305 trace_xfs_trans_alloc(tp, _RET_IP_);
306
307 *tpp = tp;
308 return 0;
309 }
310
311 /*
312 * Create an empty transaction with no reserva
313 * mechanism for routines that query metadata
314 * if the metadata being queried is somehow cr
315 * pointer that points higher in the tree), we
316 * grabbed as part of a transaction can be re-
317 * notice the corrupt block and the operation
318 * without deadlocking.
319 *
320 * Note the zero-length reservation; this tran
321 * any dirty data.
322 *
323 * Callers should obtain freeze protection to
324 * where we can be grabbing buffers at the sam
325 * drain the buffer LRU list.
326 */
327 int
328 xfs_trans_alloc_empty(
329 struct xfs_mount *mp,
330 struct xfs_trans **tpp)
331 {
332 struct xfs_trans_res resv =
333
334 return xfs_trans_alloc(mp, &resv, 0, 0
335 }
336
337 /*
338 * Record the indicated change to the given fi
339 * to the file system's superblock when the tr
340 * For now, just store the change in the trans
341 *
342 * Mark the transaction structure to indicate
343 * needs to be updated before committing.
344 *
345 * Because we may not be keeping track of allo
346 * used filesystem blocks in the superblock, w
347 * superblock dirty in this transaction if we
348 * We still need to update the transaction del
349 * applied to the incore superblock, but we do
350 * cause the superblock to get locked and logg
351 * only fields in the superblock that the tran
352 */
353 void
354 xfs_trans_mod_sb(
355 xfs_trans_t *tp,
356 uint field,
357 int64_t delta)
358 {
359 uint32_t flags = (XFS_TRANS_DIR
360 xfs_mount_t *mp = tp->t_mountp;
361
362 switch (field) {
363 case XFS_TRANS_SB_ICOUNT:
364 tp->t_icount_delta += delta;
365 if (xfs_has_lazysbcount(mp))
366 flags &= ~XFS_TRANS_SB
367 break;
368 case XFS_TRANS_SB_IFREE:
369 tp->t_ifree_delta += delta;
370 if (xfs_has_lazysbcount(mp))
371 flags &= ~XFS_TRANS_SB
372 break;
373 case XFS_TRANS_SB_FDBLOCKS:
374 /*
375 * Track the number of blocks
376 * Make sure it does not excee
377 * shutdown as this can lead t
378 */
379 if (delta < 0) {
380 tp->t_blk_res_used +=
381 if (tp->t_blk_res_used
382 xfs_force_shut
383 } else if (delta > 0 && (tp->t
384 int64_t blkres_delta;
385
386 /*
387 * Return freed blocks
388 * instead of the glob
389 * overflow the trans
390 * reservation across
391 * repeatedly free and
392 */
393 blkres_delta = min_t(i
394 U
395 tp->t_blk_res += blkre
396 delta -= blkres_delta;
397 }
398 tp->t_fdblocks_delta += delta;
399 if (xfs_has_lazysbcount(mp))
400 flags &= ~XFS_TRANS_SB
401 break;
402 case XFS_TRANS_SB_RES_FDBLOCKS:
403 /*
404 * The allocation has already
405 * in-core superblock's counte
406 * be applied to the on-disk s
407 */
408 tp->t_res_fdblocks_delta += de
409 if (xfs_has_lazysbcount(mp))
410 flags &= ~XFS_TRANS_SB
411 break;
412 case XFS_TRANS_SB_FREXTENTS:
413 /*
414 * Track the number of blocks
415 * transaction. Make sure it
416 * number reserved.
417 */
418 if (delta < 0) {
419 tp->t_rtx_res_used +=
420 ASSERT(tp->t_rtx_res_u
421 }
422 tp->t_frextents_delta += delta
423 break;
424 case XFS_TRANS_SB_RES_FREXTENTS:
425 /*
426 * The allocation has already
427 * in-core superblock's counte
428 * be applied to the on-disk s
429 */
430 ASSERT(delta < 0);
431 tp->t_res_frextents_delta += d
432 break;
433 case XFS_TRANS_SB_DBLOCKS:
434 tp->t_dblocks_delta += delta;
435 break;
436 case XFS_TRANS_SB_AGCOUNT:
437 ASSERT(delta > 0);
438 tp->t_agcount_delta += delta;
439 break;
440 case XFS_TRANS_SB_IMAXPCT:
441 tp->t_imaxpct_delta += delta;
442 break;
443 case XFS_TRANS_SB_REXTSIZE:
444 tp->t_rextsize_delta += delta;
445 break;
446 case XFS_TRANS_SB_RBMBLOCKS:
447 tp->t_rbmblocks_delta += delta
448 break;
449 case XFS_TRANS_SB_RBLOCKS:
450 tp->t_rblocks_delta += delta;
451 break;
452 case XFS_TRANS_SB_REXTENTS:
453 tp->t_rextents_delta += delta;
454 break;
455 case XFS_TRANS_SB_REXTSLOG:
456 tp->t_rextslog_delta += delta;
457 break;
458 default:
459 ASSERT(0);
460 return;
461 }
462
463 tp->t_flags |= flags;
464 }
465
466 /*
467 * xfs_trans_apply_sb_deltas() is called from
468 * to bring the superblock buffer into the cur
469 * and modify it as requested by earlier calls
470 *
471 * For now we just look at each field allowed
472 * it if necessary.
473 */
474 STATIC void
475 xfs_trans_apply_sb_deltas(
476 xfs_trans_t *tp)
477 {
478 struct xfs_dsb *sbp;
479 struct xfs_buf *bp;
480 int whole = 0;
481
482 bp = xfs_trans_getsb(tp);
483 sbp = bp->b_addr;
484
485 /*
486 * Only update the superblock counters
487 */
488 if (!xfs_has_lazysbcount((tp->t_mountp
489 if (tp->t_icount_delta)
490 be64_add_cpu(&sbp->sb_
491 if (tp->t_ifree_delta)
492 be64_add_cpu(&sbp->sb_
493 if (tp->t_fdblocks_delta)
494 be64_add_cpu(&sbp->sb_
495 if (tp->t_res_fdblocks_delta)
496 be64_add_cpu(&sbp->sb_
497 }
498
499 /*
500 * Updating frextents requires careful
501 * behave like the lazysb counters bec
502 * recovery in older kenels to recompu
503 * This means that the ondisk frextent
504 * rtbitmap.
505 *
506 * Therefore, log the frextents change
507 * update the incore superblock so tha
508 * write the correct value ondisk.
509 *
510 * Don't touch m_frextents because it
511 * and those are handled by the unrese
512 */
513 if (tp->t_frextents_delta || tp->t_res
514 struct xfs_mount *mp =
515 int64_t rtxdel
516
517 rtxdelta = tp->t_frextents_del
518
519 spin_lock(&mp->m_sb_lock);
520 be64_add_cpu(&sbp->sb_frextent
521 mp->m_sb.sb_frextents += rtxde
522 spin_unlock(&mp->m_sb_lock);
523 }
524
525 if (tp->t_dblocks_delta) {
526 be64_add_cpu(&sbp->sb_dblocks,
527 whole = 1;
528 }
529 if (tp->t_agcount_delta) {
530 be32_add_cpu(&sbp->sb_agcount,
531 whole = 1;
532 }
533 if (tp->t_imaxpct_delta) {
534 sbp->sb_imax_pct += tp->t_imax
535 whole = 1;
536 }
537 if (tp->t_rextsize_delta) {
538 be32_add_cpu(&sbp->sb_rextsize
539 whole = 1;
540 }
541 if (tp->t_rbmblocks_delta) {
542 be32_add_cpu(&sbp->sb_rbmblock
543 whole = 1;
544 }
545 if (tp->t_rblocks_delta) {
546 be64_add_cpu(&sbp->sb_rblocks,
547 whole = 1;
548 }
549 if (tp->t_rextents_delta) {
550 be64_add_cpu(&sbp->sb_rextents
551 whole = 1;
552 }
553 if (tp->t_rextslog_delta) {
554 sbp->sb_rextslog += tp->t_rext
555 whole = 1;
556 }
557
558 xfs_trans_buf_set_type(tp, bp, XFS_BLF
559 if (whole)
560 /*
561 * Log the whole thing, the fi
562 */
563 xfs_trans_log_buf(tp, bp, 0, s
564 else
565 /*
566 * Since all the modifiable fi
567 * can get away with this.
568 */
569 xfs_trans_log_buf(tp, bp, offs
570 offsetof(str
571 sizeof(sbp->
572 }
573
574 /*
575 * xfs_trans_unreserve_and_mod_sb() is called
576 * apply superblock counter changes to the in-
577 * t_res_fdblocks_delta and t_res_frextents_de
578 * applied to the in-core superblock. The ide
579 * done.
580 *
581 * If we are not logging superblock counters,
582 * used block counts are not updated in the on
583 * XFS_TRANS_SB_DIRTY will not be set when the
584 * still need to update the incore superblock
585 *
586 * Deltas for the inode count are +/-64, hence
587 * so we don't need to take the counter lock o
588 */
589 #define XFS_ICOUNT_BATCH 128
590
591 void
592 xfs_trans_unreserve_and_mod_sb(
593 struct xfs_trans *tp)
594 {
595 struct xfs_mount *mp = tp->t_mo
596 int64_t blkdelta = tp-
597 int64_t rtxdelta = tp-
598 int64_t idelta = 0;
599 int64_t ifreedelta = 0
600
601 /*
602 * Calculate the deltas.
603 *
604 * t_fdblocks_delta and t_frextents_de
605 *
606 * - positive values indicate blocks
607 * - negative values indicate blocks
608 *
609 * Negative values can only happen if
610 * reservation that covers the allocat
611 * that the calculated delta values mu
612 * can only put back previous allocate
613 */
614 ASSERT(tp->t_blk_res || tp->t_fdblocks
615 if (xfs_has_lazysbcount(mp) || (tp->t_
616 blkdelta += tp->t_fdblocks_del
617 ASSERT(blkdelta >= 0);
618 }
619
620 ASSERT(tp->t_rtx_res || tp->t_frextent
621 if (tp->t_flags & XFS_TRANS_SB_DIRTY)
622 rtxdelta += tp->t_frextents_de
623 ASSERT(rtxdelta >= 0);
624 }
625
626 if (xfs_has_lazysbcount(mp) || (tp->t_
627 idelta = tp->t_icount_delta;
628 ifreedelta = tp->t_ifree_delta
629 }
630
631 /* apply the per-cpu counters */
632 if (blkdelta)
633 xfs_add_fdblocks(mp, blkdelta)
634
635 if (idelta)
636 percpu_counter_add_batch(&mp->
637 XFS_I
638
639 if (ifreedelta)
640 percpu_counter_add(&mp->m_ifre
641
642 if (rtxdelta)
643 xfs_add_frextents(mp, rtxdelta
644
645 if (!(tp->t_flags & XFS_TRANS_SB_DIRTY
646 return;
647
648 /* apply remaining deltas */
649 spin_lock(&mp->m_sb_lock);
650 mp->m_sb.sb_fdblocks += tp->t_fdblocks
651 mp->m_sb.sb_icount += idelta;
652 mp->m_sb.sb_ifree += ifreedelta;
653 /*
654 * Do not touch sb_frextents here beca
655 * reservation. sb_frextents is not p
656 * must be consistent with the ondisk
657 * incore reservations.
658 */
659 mp->m_sb.sb_dblocks += tp->t_dblocks_d
660 mp->m_sb.sb_agcount += tp->t_agcount_d
661 mp->m_sb.sb_imax_pct += tp->t_imaxpct_
662 mp->m_sb.sb_rextsize += tp->t_rextsize
663 if (tp->t_rextsize_delta) {
664 mp->m_rtxblklog = log2_if_powe
665 mp->m_rtxblkmask = mask64_if_p
666 }
667 mp->m_sb.sb_rbmblocks += tp->t_rbmbloc
668 mp->m_sb.sb_rblocks += tp->t_rblocks_d
669 mp->m_sb.sb_rextents += tp->t_rextents
670 mp->m_sb.sb_rextslog += tp->t_rextslog
671 spin_unlock(&mp->m_sb_lock);
672
673 /*
674 * Debug checks outside of the spinloc
675 * machine if they fail.
676 */
677 ASSERT(mp->m_sb.sb_imax_pct >= 0);
678 ASSERT(mp->m_sb.sb_rextslog >= 0);
679 }
680
681 /* Add the given log item to the transaction's
682 void
683 xfs_trans_add_item(
684 struct xfs_trans *tp,
685 struct xfs_log_item *lip)
686 {
687 ASSERT(lip->li_log == tp->t_mountp->m_
688 ASSERT(lip->li_ailp == tp->t_mountp->m
689 ASSERT(list_empty(&lip->li_trans));
690 ASSERT(!test_bit(XFS_LI_DIRTY, &lip->l
691
692 list_add_tail(&lip->li_trans, &tp->t_i
693 trace_xfs_trans_add_item(tp, _RET_IP_)
694 }
695
696 /*
697 * Unlink the log item from the transaction. t
698 * considered dirty in this transaction, as th
699 * finished, either by abort or commit complet
700 */
701 void
702 xfs_trans_del_item(
703 struct xfs_log_item *lip)
704 {
705 clear_bit(XFS_LI_DIRTY, &lip->li_flags
706 list_del_init(&lip->li_trans);
707 }
708
709 /* Detach and unlock all of the items in a tra
710 static void
711 xfs_trans_free_items(
712 struct xfs_trans *tp,
713 bool abort)
714 {
715 struct xfs_log_item *lip, *next;
716
717 trace_xfs_trans_free_items(tp, _RET_IP
718
719 list_for_each_entry_safe(lip, next, &t
720 xfs_trans_del_item(lip);
721 if (abort)
722 set_bit(XFS_LI_ABORTED
723 if (lip->li_ops->iop_release)
724 lip->li_ops->iop_relea
725 }
726 }
727
728 /*
729 * Sort transaction items prior to running pre
730 * attempt to order the items such that they w
731 * order. Items that have no sort function are
732 * and so are locked last.
733 *
734 * This may need refinement as different types
735 *
736 * Function is more complex than it needs to b
737 * values and the function only returns 32 bit
738 */
739 static int
740 xfs_trans_precommit_sort(
741 void *unused_arg,
742 const struct list_head *a,
743 const struct list_head *b)
744 {
745 struct xfs_log_item *lia = contain
746 struct
747 struct xfs_log_item *lib = contain
748 struct
749 int64_t diff;
750
751 /*
752 * If both items are non-sortable, lea
753 * sortable, move the non-sortable ite
754 */
755 if (!lia->li_ops->iop_sort && !lib->li
756 return 0;
757 if (!lia->li_ops->iop_sort)
758 return 1;
759 if (!lib->li_ops->iop_sort)
760 return -1;
761
762 diff = lia->li_ops->iop_sort(lia) - li
763 if (diff < 0)
764 return -1;
765 if (diff > 0)
766 return 1;
767 return 0;
768 }
769
770 /*
771 * Run transaction precommit functions.
772 *
773 * If there is an error in any of the callouts
774 * trigger a shutdown to abort the transaction
775 * from errors at this point as the transactio
776 */
777 static int
778 xfs_trans_run_precommits(
779 struct xfs_trans *tp)
780 {
781 struct xfs_mount *mp = tp->t_mo
782 struct xfs_log_item *lip, *n;
783 int error = 0;
784
785 /*
786 * Sort the item list to avoid ABBA de
787 * running precommit operations that l
788 * inode cluster buffers.
789 */
790 list_sort(NULL, &tp->t_items, xfs_tran
791
792 /*
793 * Precommit operations can remove the
794 * if the log item exists purely to de
795 * can be ordered against other operat
796 * list_for_each_entry_safe() here.
797 */
798 list_for_each_entry_safe(lip, n, &tp->
799 if (!test_bit(XFS_LI_DIRTY, &l
800 continue;
801 if (lip->li_ops->iop_precommit
802 error = lip->li_ops->i
803 if (error)
804 break;
805 }
806 }
807 if (error)
808 xfs_force_shutdown(mp, SHUTDOW
809 return error;
810 }
811
812 /*
813 * Commit the given transaction to the log.
814 *
815 * XFS disk error handling mechanism is not ba
816 * transaction abort mechanism. Logically afte
817 * gets marked 'SHUTDOWN', we can't let any ne
818 * be durable - ie. committed to disk - becaus
819 * be inconsistent. In such cases, this return
820 * caller may assume that all locked objects j
821 * have already been unlocked as if the commit
822 * Do not reference the transaction structure
823 */
824 static int
825 __xfs_trans_commit(
826 struct xfs_trans *tp,
827 bool regrant)
828 {
829 struct xfs_mount *mp = tp->t_mo
830 struct xlog *log = mp->m_l
831 xfs_csn_t commit_seq = 0
832 int error = 0;
833 int sync = tp->t_f
834
835 trace_xfs_trans_commit(tp, _RET_IP_);
836
837 error = xfs_trans_run_precommits(tp);
838 if (error) {
839 if (tp->t_flags & XFS_TRANS_PE
840 xfs_defer_cancel(tp);
841 goto out_unreserve;
842 }
843
844 /*
845 * Finish deferred items on final comm
846 * should ever have deferred ops.
847 */
848 WARN_ON_ONCE(!list_empty(&tp->t_dfops)
849 !(tp->t_flags & XFS_TRANS
850 if (!regrant && (tp->t_flags & XFS_TRA
851 error = xfs_defer_finish_norol
852 if (error)
853 goto out_unreserve;
854
855 /* Run precommits from final t
856 error = xfs_trans_run_precommi
857 if (error)
858 goto out_unreserve;
859 }
860
861 /*
862 * If there is nothing to be logged by
863 * then unlock all of the items associ
864 * transaction and free the transactio
865 * Also make sure to return any reserv
866 * the free pool.
867 */
868 if (!(tp->t_flags & XFS_TRANS_DIRTY))
869 goto out_unreserve;
870
871 /*
872 * We must check against log shutdown
873 * items and leave them dirty, inconsi
874 * the log is active. This leaves them
875 * disk, and that will lead to on-disk
876 */
877 if (xlog_is_shutdown(log)) {
878 error = -EIO;
879 goto out_unreserve;
880 }
881
882 ASSERT(tp->t_ticket != NULL);
883
884 /*
885 * If we need to update the superblock
886 */
887 if (tp->t_flags & XFS_TRANS_SB_DIRTY)
888 xfs_trans_apply_sb_deltas(tp);
889 xfs_trans_apply_dquot_deltas(tp);
890
891 xlog_cil_commit(log, tp, &commit_seq,
892
893 xfs_trans_free(tp);
894
895 /*
896 * If the transaction needs to be sync
897 * log out now and wait for it.
898 */
899 if (sync) {
900 error = xfs_log_force_seq(mp,
901 XFS_STATS_INC(mp, xs_trans_syn
902 } else {
903 XFS_STATS_INC(mp, xs_trans_asy
904 }
905
906 return error;
907
908 out_unreserve:
909 xfs_trans_unreserve_and_mod_sb(tp);
910
911 /*
912 * It is indeed possible for the trans
913 * the dqinfo portion to be. All that
914 * (non-persistent) quota reservations
915 */
916 xfs_trans_unreserve_and_mod_dquots(tp)
917 if (tp->t_ticket) {
918 if (regrant && !xlog_is_shutdo
919 xfs_log_ticket_regrant
920 else
921 xfs_log_ticket_ungrant
922 tp->t_ticket = NULL;
923 }
924 xfs_trans_free_items(tp, !!error);
925 xfs_trans_free(tp);
926
927 XFS_STATS_INC(mp, xs_trans_empty);
928 return error;
929 }
930
931 int
932 xfs_trans_commit(
933 struct xfs_trans *tp)
934 {
935 return __xfs_trans_commit(tp, false);
936 }
937
938 /*
939 * Unlock all of the transaction's items and f
940 * transaction is dirty, we must shut down the
941 * way to restore them to their previous state
942 *
943 * If the transaction has made a log reservati
944 * well.
945 *
946 * This is a high level function (equivalent t
947 * be called after the transaction has effecti
948 * being shut down. However, if the mount has
949 * transaction is dirty we will shut the mount
950 * guarantees that the log is shut down, too.
951 * careful with shutdown state and dirty items
952 * xfs_trans_commit().
953 */
954 void
955 xfs_trans_cancel(
956 struct xfs_trans *tp)
957 {
958 struct xfs_mount *mp = tp->t_mo
959 struct xlog *log = mp->m_l
960 bool dirty = (tp->t
961
962 trace_xfs_trans_cancel(tp, _RET_IP_);
963
964 /*
965 * It's never valid to cancel a transa
966 * because the transaction is effectiv
967 * loudly before freeing the in-memory
968 * filesystem.
969 */
970 if (!list_empty(&tp->t_dfops)) {
971 ASSERT(tp->t_flags & XFS_TRANS
972 dirty = true;
973 xfs_defer_cancel(tp);
974 }
975
976 /*
977 * See if the caller is relying on us
978 * only want an error report if there
979 * progress, so we only need to check
980 * here.
981 */
982 if (dirty && !xfs_is_shutdown(mp)) {
983 XFS_ERROR_REPORT("xfs_trans_ca
984 xfs_force_shutdown(mp, SHUTDOW
985 }
986 #ifdef DEBUG
987 /* Log items need to be consistent unt
988 if (!dirty && !xlog_is_shutdown(log))
989 struct xfs_log_item *lip;
990
991 list_for_each_entry(lip, &tp->
992 ASSERT(!xlog_item_is_i
993 }
994 #endif
995 xfs_trans_unreserve_and_mod_sb(tp);
996 xfs_trans_unreserve_and_mod_dquots(tp)
997
998 if (tp->t_ticket) {
999 xfs_log_ticket_ungrant(log, tp
1000 tp->t_ticket = NULL;
1001 }
1002
1003 xfs_trans_free_items(tp, dirty);
1004 xfs_trans_free(tp);
1005 }
1006
1007 /*
1008 * Roll from one trans in the sequence of PER
1009 * the next: permanent transactions are only
1010 * committed with xfs_trans_commit(), but we
1011 * as possible to let chunks of it go to the
1012 * chunk we've been working on and get a new
1013 */
1014 int
1015 xfs_trans_roll(
1016 struct xfs_trans **tpp)
1017 {
1018 struct xfs_trans *trans = *tpp
1019 struct xfs_trans_res tres;
1020 int error;
1021
1022 trace_xfs_trans_roll(trans, _RET_IP_)
1023
1024 /*
1025 * Copy the critical parameters from
1026 */
1027 tres.tr_logres = trans->t_log_res;
1028 tres.tr_logcount = trans->t_log_count
1029
1030 *tpp = xfs_trans_dup(trans);
1031
1032 /*
1033 * Commit the current transaction.
1034 * If this commit failed, then it'd j
1035 * are not marked ihold. That also me
1036 * is in progress. The caller takes t
1037 * the duplicate transaction that get
1038 */
1039 error = __xfs_trans_commit(trans, tru
1040 if (error)
1041 return error;
1042
1043 /*
1044 * Reserve space in the log for the n
1045 * This also pushes items in the "AIL
1046 * out to disk if they are taking up
1047 * that we want to use. This require
1048 * across this call, or that anything
1049 * the prior and the next transaction
1050 */
1051 tres.tr_logflags = XFS_TRANS_PERM_LOG
1052 return xfs_trans_reserve(*tpp, &tres,
1053 }
1054
1055 /*
1056 * Allocate an transaction, lock and join the
1057 *
1058 * The caller must ensure that the on-disk dq
1059 * already been allocated and initialized. T
1060 * releasing ILOCK_EXCL if a new transaction
1061 */
1062 int
1063 xfs_trans_alloc_inode(
1064 struct xfs_inode *ip,
1065 struct xfs_trans_res *resv,
1066 unsigned int dblocks,
1067 unsigned int rblocks,
1068 bool force,
1069 struct xfs_trans **tpp)
1070 {
1071 struct xfs_trans *tp;
1072 struct xfs_mount *mp = ip->i_m
1073 bool retried = fal
1074 int error;
1075
1076 retry:
1077 error = xfs_trans_alloc(mp, resv, dbl
1078 xfs_extlen_to_rtxlen(
1079 force ? XFS_TRANS_RES
1080 if (error)
1081 return error;
1082
1083 xfs_ilock(ip, XFS_ILOCK_EXCL);
1084 xfs_trans_ijoin(tp, ip, 0);
1085
1086 error = xfs_qm_dqattach_locked(ip, fa
1087 if (error) {
1088 /* Caller should have allocat
1089 ASSERT(error != -ENOENT);
1090 goto out_cancel;
1091 }
1092
1093 error = xfs_trans_reserve_quota_nblks
1094 if ((error == -EDQUOT || error == -EN
1095 xfs_trans_cancel(tp);
1096 xfs_iunlock(ip, XFS_ILOCK_EXC
1097 xfs_blockgc_free_quota(ip, 0)
1098 retried = true;
1099 goto retry;
1100 }
1101 if (error)
1102 goto out_cancel;
1103
1104 *tpp = tp;
1105 return 0;
1106
1107 out_cancel:
1108 xfs_trans_cancel(tp);
1109 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1110 return error;
1111 }
1112
1113 /*
1114 * Try to reserve more blocks for a transacti
1115 *
1116 * This is for callers that need to attach re
1117 * those resources to determine the space res
1118 * modify the attached resources. In other w
1119 * fail due to ENOSPC, so the caller must be
1120 * without shutting down the fs.
1121 */
1122 int
1123 xfs_trans_reserve_more(
1124 struct xfs_trans *tp,
1125 unsigned int blocks,
1126 unsigned int rtextents)
1127 {
1128 struct xfs_trans_res resv = { };
1129
1130 return xfs_trans_reserve(tp, &resv, b
1131 }
1132
1133 /*
1134 * Try to reserve more blocks and file quota
1135 * conditions of usage as xfs_trans_reserve_m
1136 */
1137 int
1138 xfs_trans_reserve_more_inode(
1139 struct xfs_trans *tp,
1140 struct xfs_inode *ip,
1141 unsigned int dblocks,
1142 unsigned int rblocks,
1143 bool force_quota)
1144 {
1145 struct xfs_trans_res resv = { };
1146 struct xfs_mount *mp = ip->i_m
1147 unsigned int rtx = xfs_ext
1148 int error;
1149
1150 xfs_assert_ilocked(ip, XFS_ILOCK_EXCL
1151
1152 error = xfs_trans_reserve(tp, &resv,
1153 if (error)
1154 return error;
1155
1156 if (!XFS_IS_QUOTA_ON(mp) || xfs_is_qu
1157 return 0;
1158
1159 if (tp->t_flags & XFS_TRANS_RESERVE)
1160 force_quota = true;
1161
1162 error = xfs_trans_reserve_quota_nblks
1163 force_quota);
1164 if (!error)
1165 return 0;
1166
1167 /* Quota failed, give back the new re
1168 xfs_add_fdblocks(mp, dblocks);
1169 tp->t_blk_res -= dblocks;
1170 xfs_add_frextents(mp, rtx);
1171 tp->t_rtx_res -= rtx;
1172 return error;
1173 }
1174
1175 /*
1176 * Allocate an transaction in preparation for
1177 * against the given dquots. Callers are not
1178 */
1179 int
1180 xfs_trans_alloc_icreate(
1181 struct xfs_mount *mp,
1182 struct xfs_trans_res *resv,
1183 struct xfs_dquot *udqp,
1184 struct xfs_dquot *gdqp,
1185 struct xfs_dquot *pdqp,
1186 unsigned int dblocks,
1187 struct xfs_trans **tpp)
1188 {
1189 struct xfs_trans *tp;
1190 bool retried = fal
1191 int error;
1192
1193 retry:
1194 error = xfs_trans_alloc(mp, resv, dbl
1195 if (error)
1196 return error;
1197
1198 error = xfs_trans_reserve_quota_icrea
1199 if ((error == -EDQUOT || error == -EN
1200 xfs_trans_cancel(tp);
1201 xfs_blockgc_free_dquots(mp, u
1202 retried = true;
1203 goto retry;
1204 }
1205 if (error) {
1206 xfs_trans_cancel(tp);
1207 return error;
1208 }
1209
1210 *tpp = tp;
1211 return 0;
1212 }
1213
1214 /*
1215 * Allocate an transaction, lock and join the
1216 * in preparation for inode attribute changes
1217 * changes.
1218 *
1219 * The caller must ensure that the on-disk dq
1220 * already been allocated and initialized. T
1221 * transaction is committed or cancelled.
1222 */
1223 int
1224 xfs_trans_alloc_ichange(
1225 struct xfs_inode *ip,
1226 struct xfs_dquot *new_udqp,
1227 struct xfs_dquot *new_gdqp,
1228 struct xfs_dquot *new_pdqp,
1229 bool force,
1230 struct xfs_trans **tpp)
1231 {
1232 struct xfs_trans *tp;
1233 struct xfs_mount *mp = ip->i_m
1234 struct xfs_dquot *udqp;
1235 struct xfs_dquot *gdqp;
1236 struct xfs_dquot *pdqp;
1237 bool retried = fal
1238 int error;
1239
1240 retry:
1241 error = xfs_trans_alloc(mp, &M_RES(mp
1242 if (error)
1243 return error;
1244
1245 xfs_ilock(ip, XFS_ILOCK_EXCL);
1246 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXC
1247
1248 error = xfs_qm_dqattach_locked(ip, fa
1249 if (error) {
1250 /* Caller should have allocat
1251 ASSERT(error != -ENOENT);
1252 goto out_cancel;
1253 }
1254
1255 /*
1256 * For each quota type, skip quota re
1257 * now match the ones that came from
1258 * pass one in. The inode's dquots c
1259 * perform a blockgc scan, so we must
1260 */
1261 udqp = (new_udqp != ip->i_udquot) ? n
1262 gdqp = (new_gdqp != ip->i_gdquot) ? n
1263 pdqp = (new_pdqp != ip->i_pdquot) ? n
1264 if (udqp || gdqp || pdqp) {
1265 unsigned int qflags = XFS_
1266
1267 if (force)
1268 qflags |= XFS_QMOPT_F
1269
1270 /*
1271 * Reserve enough quota to ha
1272 * for a delayed allocation.
1273 * delalloc reservation betwe
1274 * though that part is only s
1275 */
1276 error = xfs_trans_reserve_quo
1277 pdqp, ip->i_n
1278 1, qflags);
1279 if ((error == -EDQUOT || erro
1280 xfs_trans_cancel(tp);
1281 xfs_blockgc_free_dquo
1282 retried = true;
1283 goto retry;
1284 }
1285 if (error)
1286 goto out_cancel;
1287 }
1288
1289 *tpp = tp;
1290 return 0;
1291
1292 out_cancel:
1293 xfs_trans_cancel(tp);
1294 return error;
1295 }
1296
1297 /*
1298 * Allocate an transaction, lock and join the
1299 * and reserve quota for a directory update.
1300 * @dblocks will be set to zero for a reserva
1301 * @nospace_error will be set to a negative e
1302 * constraint we hit.
1303 *
1304 * The caller must ensure that the on-disk dq
1305 * already been allocated and initialized. T
1306 * transaction is committed or cancelled.
1307 *
1308 * Caller is responsible for unlocking the in
1309 */
1310 int
1311 xfs_trans_alloc_dir(
1312 struct xfs_inode *dp,
1313 struct xfs_trans_res *resv,
1314 struct xfs_inode *ip,
1315 unsigned int *dblocks,
1316 struct xfs_trans **tpp,
1317 int *nospace_erro
1318 {
1319 struct xfs_trans *tp;
1320 struct xfs_mount *mp = ip->i_m
1321 unsigned int resblks;
1322 bool retried = fal
1323 int error;
1324
1325 retry:
1326 *nospace_error = 0;
1327 resblks = *dblocks;
1328 error = xfs_trans_alloc(mp, resv, res
1329 if (error == -ENOSPC) {
1330 *nospace_error = error;
1331 resblks = 0;
1332 error = xfs_trans_alloc(mp, r
1333 }
1334 if (error)
1335 return error;
1336
1337 xfs_lock_two_inodes(dp, XFS_ILOCK_EXC
1338
1339 xfs_trans_ijoin(tp, dp, 0);
1340 xfs_trans_ijoin(tp, ip, 0);
1341
1342 error = xfs_qm_dqattach_locked(dp, fa
1343 if (error) {
1344 /* Caller should have allocat
1345 ASSERT(error != -ENOENT);
1346 goto out_cancel;
1347 }
1348
1349 error = xfs_qm_dqattach_locked(ip, fa
1350 if (error) {
1351 /* Caller should have allocat
1352 ASSERT(error != -ENOENT);
1353 goto out_cancel;
1354 }
1355
1356 if (resblks == 0)
1357 goto done;
1358
1359 error = xfs_trans_reserve_quota_nblks
1360 if (error == -EDQUOT || error == -ENO
1361 if (!retried) {
1362 xfs_trans_cancel(tp);
1363 xfs_iunlock(dp, XFS_I
1364 if (dp != ip)
1365 xfs_iunlock(i
1366 xfs_blockgc_free_quot
1367 retried = true;
1368 goto retry;
1369 }
1370
1371 *nospace_error = error;
1372 resblks = 0;
1373 error = 0;
1374 }
1375 if (error)
1376 goto out_cancel;
1377
1378 done:
1379 *tpp = tp;
1380 *dblocks = resblks;
1381 return 0;
1382
1383 out_cancel:
1384 xfs_trans_cancel(tp);
1385 return error;
1386 }
1387
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