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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// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
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_log_priv.h"
13#include "xfs_trans_resv.h"
14#include "xfs_mount.h"
15#include "xfs_extent_busy.h"
16#include "xfs_quota.h"
17#include "xfs_trans.h"
18#include "xfs_trans_priv.h"
19#include "xfs_log.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
28kmem_zone_t *xfs_trans_zone;
29
30#if defined(CONFIG_TRACEPOINTS)
31static void
32xfs_trans_trace_reservations(
33 struct xfs_mount *mp)
34{
35 struct xfs_trans_res resv;
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_RES(mp) + 1);
42 for (i = 0; res < end_res; i++, res++)
43 trace_xfs_trans_resv_calc(mp, i, res);
44 xfs_log_get_max_trans_res(mp, &resv);
45 trace_xfs_trans_resv_calc(mp, -1, &resv);
46}
47#else
48# define xfs_trans_trace_reservations(mp)
49#endif
50
51/*
52 * Initialize the precomputed transaction reservation values
53 * in the mount structure.
54 */
55void
56xfs_trans_init(
57 struct xfs_mount *mp)
58{
59 xfs_trans_resv_calc(mp, M_RES(mp));
60 xfs_trans_trace_reservations(mp);
61}
62
63/*
64 * Free the transaction structure. If there is more clean up
65 * to do when the structure is freed, add it here.
66 */
67STATIC void
68xfs_trans_free(
69 struct xfs_trans *tp)
70{
71 xfs_extent_busy_sort(&tp->t_busy);
72 xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false);
73
74 trace_xfs_trans_free(tp, _RET_IP_);
75 xfs_trans_clear_context(tp);
76 if (!(tp->t_flags & XFS_TRANS_NO_WRITECOUNT))
77 sb_end_intwrite(tp->t_mountp->m_super);
78 xfs_trans_free_dqinfo(tp);
79 kmem_cache_free(xfs_trans_zone, tp);
80}
81
82/*
83 * This is called to create a new transaction which will share the
84 * permanent log reservation of the given transaction. The remaining
85 * unused block and rt extent reservations are also inherited. This
86 * implies that the original transaction is no longer allowed to allocate
87 * blocks. Locks and log items, however, are no inherited. They must
88 * be added to the new transaction explicitly.
89 */
90STATIC struct xfs_trans *
91xfs_trans_dup(
92 struct xfs_trans *tp)
93{
94 struct xfs_trans *ntp;
95
96 trace_xfs_trans_dup(tp, _RET_IP_);
97
98 ntp = kmem_cache_zalloc(xfs_trans_zone, GFP_KERNEL | __GFP_NOFAIL);
99
100 /*
101 * Initialize the new transaction structure.
102 */
103 ntp->t_magic = XFS_TRANS_HEADER_MAGIC;
104 ntp->t_mountp = tp->t_mountp;
105 INIT_LIST_HEAD(&ntp->t_items);
106 INIT_LIST_HEAD(&ntp->t_busy);
107 INIT_LIST_HEAD(&ntp->t_dfops);
108 ntp->t_firstblock = NULLFSBLOCK;
109
110 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
111 ASSERT(tp->t_ticket != NULL);
112
113 ntp->t_flags = XFS_TRANS_PERM_LOG_RES |
114 (tp->t_flags & XFS_TRANS_RESERVE) |
115 (tp->t_flags & XFS_TRANS_NO_WRITECOUNT) |
116 (tp->t_flags & XFS_TRANS_RES_FDBLKS);
117 /* We gave our writer reference to the new transaction */
118 tp->t_flags |= XFS_TRANS_NO_WRITECOUNT;
119 ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
120
121 ASSERT(tp->t_blk_res >= tp->t_blk_res_used);
122 ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
123 tp->t_blk_res = tp->t_blk_res_used;
124
125 ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
126 tp->t_rtx_res = tp->t_rtx_res_used;
127
128 xfs_trans_switch_context(tp, ntp);
129
130 /* move deferred ops over to the new tp */
131 xfs_defer_move(ntp, tp);
132
133 xfs_trans_dup_dqinfo(tp, ntp);
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 struct xfs_mount *mp = tp->t_mountp;
159 int error = 0;
160 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
161
162 /*
163 * Attempt to reserve the needed disk blocks by decrementing
164 * the number needed from the number available. This will
165 * fail if the count would go below zero.
166 */
167 if (blocks > 0) {
168 error = xfs_mod_fdblocks(mp, -((int64_t)blocks), rsvd);
169 if (error != 0)
170 return -ENOSPC;
171 tp->t_blk_res += blocks;
172 }
173
174 /*
175 * Reserve the log space needed for this transaction.
176 */
177 if (resp->tr_logres > 0) {
178 bool permanent = false;
179
180 ASSERT(tp->t_log_res == 0 ||
181 tp->t_log_res == resp->tr_logres);
182 ASSERT(tp->t_log_count == 0 ||
183 tp->t_log_count == resp->tr_logcount);
184
185 if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
186 tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
187 permanent = true;
188 } else {
189 ASSERT(tp->t_ticket == NULL);
190 ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
191 }
192
193 if (tp->t_ticket != NULL) {
194 ASSERT(resp->tr_logflags & XFS_TRANS_PERM_LOG_RES);
195 error = xfs_log_regrant(mp, tp->t_ticket);
196 } else {
197 error = xfs_log_reserve(mp,
198 resp->tr_logres,
199 resp->tr_logcount,
200 &tp->t_ticket, XFS_TRANSACTION,
201 permanent);
202 }
203
204 if (error)
205 goto undo_blocks;
206
207 tp->t_log_res = resp->tr_logres;
208 tp->t_log_count = resp->tr_logcount;
209 }
210
211 /*
212 * Attempt to reserve the needed realtime extents by decrementing
213 * the number needed from the number available. This will
214 * fail if the count would go below zero.
215 */
216 if (rtextents > 0) {
217 error = xfs_mod_frextents(mp, -((int64_t)rtextents));
218 if (error) {
219 error = -ENOSPC;
220 goto undo_log;
221 }
222 tp->t_rtx_res += rtextents;
223 }
224
225 return 0;
226
227 /*
228 * Error cases jump to one of these labels to undo any
229 * reservations which have already been performed.
230 */
231undo_log:
232 if (resp->tr_logres > 0) {
233 xfs_log_ticket_ungrant(mp->m_log, tp->t_ticket);
234 tp->t_ticket = NULL;
235 tp->t_log_res = 0;
236 tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
237 }
238
239undo_blocks:
240 if (blocks > 0) {
241 xfs_mod_fdblocks(mp, (int64_t)blocks, rsvd);
242 tp->t_blk_res = 0;
243 }
244 return error;
245}
246
247int
248xfs_trans_alloc(
249 struct xfs_mount *mp,
250 struct xfs_trans_res *resp,
251 uint blocks,
252 uint rtextents,
253 uint flags,
254 struct xfs_trans **tpp)
255{
256 struct xfs_trans *tp;
257 bool want_retry = true;
258 int error;
259
260 /*
261 * Allocate the handle before we do our freeze accounting and setting up
262 * GFP_NOFS allocation context so that we avoid lockdep false positives
263 * by doing GFP_KERNEL allocations inside sb_start_intwrite().
264 */
265retry:
266 tp = kmem_cache_zalloc(xfs_trans_zone, GFP_KERNEL | __GFP_NOFAIL);
267 if (!(flags & XFS_TRANS_NO_WRITECOUNT))
268 sb_start_intwrite(mp->m_super);
269 xfs_trans_set_context(tp);
270
271 /*
272 * Zero-reservation ("empty") transactions can't modify anything, so
273 * they're allowed to run while we're frozen.
274 */
275 WARN_ON(resp->tr_logres > 0 &&
276 mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
277 ASSERT(!(flags & XFS_TRANS_RES_FDBLKS) ||
278 xfs_sb_version_haslazysbcount(&mp->m_sb));
279
280 tp->t_magic = XFS_TRANS_HEADER_MAGIC;
281 tp->t_flags = flags;
282 tp->t_mountp = mp;
283 INIT_LIST_HEAD(&tp->t_items);
284 INIT_LIST_HEAD(&tp->t_busy);
285 INIT_LIST_HEAD(&tp->t_dfops);
286 tp->t_firstblock = NULLFSBLOCK;
287
288 error = xfs_trans_reserve(tp, resp, blocks, rtextents);
289 if (error == -ENOSPC && want_retry) {
290 xfs_trans_cancel(tp);
291
292 /*
293 * We weren't able to reserve enough space for the transaction.
294 * Flush the other speculative space allocations to free space.
295 * Do not perform a synchronous scan because callers can hold
296 * other locks.
297 */
298 error = xfs_blockgc_free_space(mp, NULL);
299 if (error)
300 return error;
301
302 want_retry = false;
303 goto retry;
304 }
305 if (error) {
306 xfs_trans_cancel(tp);
307 return error;
308 }
309
310 trace_xfs_trans_alloc(tp, _RET_IP_);
311
312 *tpp = tp;
313 return 0;
314}
315
316/*
317 * Create an empty transaction with no reservation. This is a defensive
318 * mechanism for routines that query metadata without actually modifying them --
319 * if the metadata being queried is somehow cross-linked (think a btree block
320 * pointer that points higher in the tree), we risk deadlock. However, blocks
321 * grabbed as part of a transaction can be re-grabbed. The verifiers will
322 * notice the corrupt block and the operation will fail back to userspace
323 * without deadlocking.
324 *
325 * Note the zero-length reservation; this transaction MUST be cancelled without
326 * any dirty data.
327 *
328 * Callers should obtain freeze protection to avoid a conflict with fs freezing
329 * where we can be grabbing buffers at the same time that freeze is trying to
330 * drain the buffer LRU list.
331 */
332int
333xfs_trans_alloc_empty(
334 struct xfs_mount *mp,
335 struct xfs_trans **tpp)
336{
337 struct xfs_trans_res resv = {0};
338
339 return xfs_trans_alloc(mp, &resv, 0, 0, XFS_TRANS_NO_WRITECOUNT, tpp);
340}
341
342/*
343 * Record the indicated change to the given field for application
344 * to the file system's superblock when the transaction commits.
345 * For now, just store the change in the transaction structure.
346 *
347 * Mark the transaction structure to indicate that the superblock
348 * needs to be updated before committing.
349 *
350 * Because we may not be keeping track of allocated/free inodes and
351 * used filesystem blocks in the superblock, we do not mark the
352 * superblock dirty in this transaction if we modify these fields.
353 * We still need to update the transaction deltas so that they get
354 * applied to the incore superblock, but we don't want them to
355 * cause the superblock to get locked and logged if these are the
356 * only fields in the superblock that the transaction modifies.
357 */
358void
359xfs_trans_mod_sb(
360 xfs_trans_t *tp,
361 uint field,
362 int64_t delta)
363{
364 uint32_t flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
365 xfs_mount_t *mp = tp->t_mountp;
366
367 switch (field) {
368 case XFS_TRANS_SB_ICOUNT:
369 tp->t_icount_delta += delta;
370 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
371 flags &= ~XFS_TRANS_SB_DIRTY;
372 break;
373 case XFS_TRANS_SB_IFREE:
374 tp->t_ifree_delta += delta;
375 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
376 flags &= ~XFS_TRANS_SB_DIRTY;
377 break;
378 case XFS_TRANS_SB_FDBLOCKS:
379 /*
380 * Track the number of blocks allocated in the transaction.
381 * Make sure it does not exceed the number reserved. If so,
382 * shutdown as this can lead to accounting inconsistency.
383 */
384 if (delta < 0) {
385 tp->t_blk_res_used += (uint)-delta;
386 if (tp->t_blk_res_used > tp->t_blk_res)
387 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
388 } else if (delta > 0 && (tp->t_flags & XFS_TRANS_RES_FDBLKS)) {
389 int64_t blkres_delta;
390
391 /*
392 * Return freed blocks directly to the reservation
393 * instead of the global pool, being careful not to
394 * overflow the trans counter. This is used to preserve
395 * reservation across chains of transaction rolls that
396 * repeatedly free and allocate blocks.
397 */
398 blkres_delta = min_t(int64_t, delta,
399 UINT_MAX - tp->t_blk_res);
400 tp->t_blk_res += blkres_delta;
401 delta -= blkres_delta;
402 }
403 tp->t_fdblocks_delta += delta;
404 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
405 flags &= ~XFS_TRANS_SB_DIRTY;
406 break;
407 case XFS_TRANS_SB_RES_FDBLOCKS:
408 /*
409 * The allocation has already been applied to the
410 * in-core superblock's counter. This should only
411 * be applied to the on-disk superblock.
412 */
413 tp->t_res_fdblocks_delta += delta;
414 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
415 flags &= ~XFS_TRANS_SB_DIRTY;
416 break;
417 case XFS_TRANS_SB_FREXTENTS:
418 /*
419 * Track the number of blocks allocated in the
420 * transaction. Make sure it does not exceed the
421 * number reserved.
422 */
423 if (delta < 0) {
424 tp->t_rtx_res_used += (uint)-delta;
425 ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
426 }
427 tp->t_frextents_delta += delta;
428 break;
429 case XFS_TRANS_SB_RES_FREXTENTS:
430 /*
431 * The allocation has already been applied to the
432 * in-core superblock's counter. This should only
433 * be applied to the on-disk superblock.
434 */
435 ASSERT(delta < 0);
436 tp->t_res_frextents_delta += delta;
437 break;
438 case XFS_TRANS_SB_DBLOCKS:
439 tp->t_dblocks_delta += delta;
440 break;
441 case XFS_TRANS_SB_AGCOUNT:
442 ASSERT(delta > 0);
443 tp->t_agcount_delta += delta;
444 break;
445 case XFS_TRANS_SB_IMAXPCT:
446 tp->t_imaxpct_delta += delta;
447 break;
448 case XFS_TRANS_SB_REXTSIZE:
449 tp->t_rextsize_delta += delta;
450 break;
451 case XFS_TRANS_SB_RBMBLOCKS:
452 tp->t_rbmblocks_delta += delta;
453 break;
454 case XFS_TRANS_SB_RBLOCKS:
455 tp->t_rblocks_delta += delta;
456 break;
457 case XFS_TRANS_SB_REXTENTS:
458 tp->t_rextents_delta += delta;
459 break;
460 case XFS_TRANS_SB_REXTSLOG:
461 tp->t_rextslog_delta += delta;
462 break;
463 default:
464 ASSERT(0);
465 return;
466 }
467
468 tp->t_flags |= flags;
469}
470
471/*
472 * xfs_trans_apply_sb_deltas() is called from the commit code
473 * to bring the superblock buffer into the current transaction
474 * and modify it as requested by earlier calls to xfs_trans_mod_sb().
475 *
476 * For now we just look at each field allowed to change and change
477 * it if necessary.
478 */
479STATIC void
480xfs_trans_apply_sb_deltas(
481 xfs_trans_t *tp)
482{
483 xfs_dsb_t *sbp;
484 struct xfs_buf *bp;
485 int whole = 0;
486
487 bp = xfs_trans_getsb(tp);
488 sbp = bp->b_addr;
489
490 /*
491 * Only update the superblock counters if we are logging them
492 */
493 if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
494 if (tp->t_icount_delta)
495 be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
496 if (tp->t_ifree_delta)
497 be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
498 if (tp->t_fdblocks_delta)
499 be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
500 if (tp->t_res_fdblocks_delta)
501 be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
502 }
503
504 if (tp->t_frextents_delta)
505 be64_add_cpu(&sbp->sb_frextents, tp->t_frextents_delta);
506 if (tp->t_res_frextents_delta)
507 be64_add_cpu(&sbp->sb_frextents, tp->t_res_frextents_delta);
508
509 if (tp->t_dblocks_delta) {
510 be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
511 whole = 1;
512 }
513 if (tp->t_agcount_delta) {
514 be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
515 whole = 1;
516 }
517 if (tp->t_imaxpct_delta) {
518 sbp->sb_imax_pct += tp->t_imaxpct_delta;
519 whole = 1;
520 }
521 if (tp->t_rextsize_delta) {
522 be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
523 whole = 1;
524 }
525 if (tp->t_rbmblocks_delta) {
526 be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
527 whole = 1;
528 }
529 if (tp->t_rblocks_delta) {
530 be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
531 whole = 1;
532 }
533 if (tp->t_rextents_delta) {
534 be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
535 whole = 1;
536 }
537 if (tp->t_rextslog_delta) {
538 sbp->sb_rextslog += tp->t_rextslog_delta;
539 whole = 1;
540 }
541
542 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
543 if (whole)
544 /*
545 * Log the whole thing, the fields are noncontiguous.
546 */
547 xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
548 else
549 /*
550 * Since all the modifiable fields are contiguous, we
551 * can get away with this.
552 */
553 xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
554 offsetof(xfs_dsb_t, sb_frextents) +
555 sizeof(sbp->sb_frextents) - 1);
556}
557
558/*
559 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations and
560 * apply superblock counter changes to the in-core superblock. The
561 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
562 * applied to the in-core superblock. The idea is that that has already been
563 * done.
564 *
565 * If we are not logging superblock counters, then the inode allocated/free and
566 * used block counts are not updated in the on disk superblock. In this case,
567 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
568 * still need to update the incore superblock with the changes.
569 *
570 * Deltas for the inode count are +/-64, hence we use a large batch size of 128
571 * so we don't need to take the counter lock on every update.
572 */
573#define XFS_ICOUNT_BATCH 128
574
575void
576xfs_trans_unreserve_and_mod_sb(
577 struct xfs_trans *tp)
578{
579 struct xfs_mount *mp = tp->t_mountp;
580 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
581 int64_t blkdelta = 0;
582 int64_t rtxdelta = 0;
583 int64_t idelta = 0;
584 int64_t ifreedelta = 0;
585 int error;
586
587 /* calculate deltas */
588 if (tp->t_blk_res > 0)
589 blkdelta = tp->t_blk_res;
590 if ((tp->t_fdblocks_delta != 0) &&
591 (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
592 (tp->t_flags & XFS_TRANS_SB_DIRTY)))
593 blkdelta += tp->t_fdblocks_delta;
594
595 if (tp->t_rtx_res > 0)
596 rtxdelta = tp->t_rtx_res;
597 if ((tp->t_frextents_delta != 0) &&
598 (tp->t_flags & XFS_TRANS_SB_DIRTY))
599 rtxdelta += tp->t_frextents_delta;
600
601 if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
602 (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
603 idelta = tp->t_icount_delta;
604 ifreedelta = tp->t_ifree_delta;
605 }
606
607 /* apply the per-cpu counters */
608 if (blkdelta) {
609 error = xfs_mod_fdblocks(mp, blkdelta, rsvd);
610 ASSERT(!error);
611 }
612
613 if (idelta)
614 percpu_counter_add_batch(&mp->m_icount, idelta,
615 XFS_ICOUNT_BATCH);
616
617 if (ifreedelta)
618 percpu_counter_add(&mp->m_ifree, ifreedelta);
619
620 if (rtxdelta == 0 && !(tp->t_flags & XFS_TRANS_SB_DIRTY))
621 return;
622
623 /* apply remaining deltas */
624 spin_lock(&mp->m_sb_lock);
625 mp->m_sb.sb_fdblocks += tp->t_fdblocks_delta + tp->t_res_fdblocks_delta;
626 mp->m_sb.sb_icount += idelta;
627 mp->m_sb.sb_ifree += ifreedelta;
628 mp->m_sb.sb_frextents += rtxdelta;
629 mp->m_sb.sb_dblocks += tp->t_dblocks_delta;
630 mp->m_sb.sb_agcount += tp->t_agcount_delta;
631 mp->m_sb.sb_imax_pct += tp->t_imaxpct_delta;
632 mp->m_sb.sb_rextsize += tp->t_rextsize_delta;
633 mp->m_sb.sb_rbmblocks += tp->t_rbmblocks_delta;
634 mp->m_sb.sb_rblocks += tp->t_rblocks_delta;
635 mp->m_sb.sb_rextents += tp->t_rextents_delta;
636 mp->m_sb.sb_rextslog += tp->t_rextslog_delta;
637 spin_unlock(&mp->m_sb_lock);
638
639 /*
640 * Debug checks outside of the spinlock so they don't lock up the
641 * machine if they fail.
642 */
643 ASSERT(mp->m_sb.sb_imax_pct >= 0);
644 ASSERT(mp->m_sb.sb_rextslog >= 0);
645 return;
646}
647
648/* Add the given log item to the transaction's list of log items. */
649void
650xfs_trans_add_item(
651 struct xfs_trans *tp,
652 struct xfs_log_item *lip)
653{
654 ASSERT(lip->li_mountp == tp->t_mountp);
655 ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
656 ASSERT(list_empty(&lip->li_trans));
657 ASSERT(!test_bit(XFS_LI_DIRTY, &lip->li_flags));
658
659 list_add_tail(&lip->li_trans, &tp->t_items);
660 trace_xfs_trans_add_item(tp, _RET_IP_);
661}
662
663/*
664 * Unlink the log item from the transaction. the log item is no longer
665 * considered dirty in this transaction, as the linked transaction has
666 * finished, either by abort or commit completion.
667 */
668void
669xfs_trans_del_item(
670 struct xfs_log_item *lip)
671{
672 clear_bit(XFS_LI_DIRTY, &lip->li_flags);
673 list_del_init(&lip->li_trans);
674}
675
676/* Detach and unlock all of the items in a transaction */
677static void
678xfs_trans_free_items(
679 struct xfs_trans *tp,
680 bool abort)
681{
682 struct xfs_log_item *lip, *next;
683
684 trace_xfs_trans_free_items(tp, _RET_IP_);
685
686 list_for_each_entry_safe(lip, next, &tp->t_items, li_trans) {
687 xfs_trans_del_item(lip);
688 if (abort)
689 set_bit(XFS_LI_ABORTED, &lip->li_flags);
690 if (lip->li_ops->iop_release)
691 lip->li_ops->iop_release(lip);
692 }
693}
694
695static inline void
696xfs_log_item_batch_insert(
697 struct xfs_ail *ailp,
698 struct xfs_ail_cursor *cur,
699 struct xfs_log_item **log_items,
700 int nr_items,
701 xfs_lsn_t commit_lsn)
702{
703 int i;
704
705 spin_lock(&ailp->ail_lock);
706 /* xfs_trans_ail_update_bulk drops ailp->ail_lock */
707 xfs_trans_ail_update_bulk(ailp, cur, log_items, nr_items, commit_lsn);
708
709 for (i = 0; i < nr_items; i++) {
710 struct xfs_log_item *lip = log_items[i];
711
712 if (lip->li_ops->iop_unpin)
713 lip->li_ops->iop_unpin(lip, 0);
714 }
715}
716
717/*
718 * Bulk operation version of xfs_trans_committed that takes a log vector of
719 * items to insert into the AIL. This uses bulk AIL insertion techniques to
720 * minimise lock traffic.
721 *
722 * If we are called with the aborted flag set, it is because a log write during
723 * a CIL checkpoint commit has failed. In this case, all the items in the
724 * checkpoint have already gone through iop_committed and iop_committing, which
725 * means that checkpoint commit abort handling is treated exactly the same
726 * as an iclog write error even though we haven't started any IO yet. Hence in
727 * this case all we need to do is iop_committed processing, followed by an
728 * iop_unpin(aborted) call.
729 *
730 * The AIL cursor is used to optimise the insert process. If commit_lsn is not
731 * at the end of the AIL, the insert cursor avoids the need to walk
732 * the AIL to find the insertion point on every xfs_log_item_batch_insert()
733 * call. This saves a lot of needless list walking and is a net win, even
734 * though it slightly increases that amount of AIL lock traffic to set it up
735 * and tear it down.
736 */
737void
738xfs_trans_committed_bulk(
739 struct xfs_ail *ailp,
740 struct xfs_log_vec *log_vector,
741 xfs_lsn_t commit_lsn,
742 bool aborted)
743{
744#define LOG_ITEM_BATCH_SIZE 32
745 struct xfs_log_item *log_items[LOG_ITEM_BATCH_SIZE];
746 struct xfs_log_vec *lv;
747 struct xfs_ail_cursor cur;
748 int i = 0;
749
750 spin_lock(&ailp->ail_lock);
751 xfs_trans_ail_cursor_last(ailp, &cur, commit_lsn);
752 spin_unlock(&ailp->ail_lock);
753
754 /* unpin all the log items */
755 for (lv = log_vector; lv; lv = lv->lv_next ) {
756 struct xfs_log_item *lip = lv->lv_item;
757 xfs_lsn_t item_lsn;
758
759 if (aborted)
760 set_bit(XFS_LI_ABORTED, &lip->li_flags);
761
762 if (lip->li_ops->flags & XFS_ITEM_RELEASE_WHEN_COMMITTED) {
763 lip->li_ops->iop_release(lip);
764 continue;
765 }
766
767 if (lip->li_ops->iop_committed)
768 item_lsn = lip->li_ops->iop_committed(lip, commit_lsn);
769 else
770 item_lsn = commit_lsn;
771
772 /* item_lsn of -1 means the item needs no further processing */
773 if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
774 continue;
775
776 /*
777 * if we are aborting the operation, no point in inserting the
778 * object into the AIL as we are in a shutdown situation.
779 */
780 if (aborted) {
781 ASSERT(XFS_FORCED_SHUTDOWN(ailp->ail_mount));
782 if (lip->li_ops->iop_unpin)
783 lip->li_ops->iop_unpin(lip, 1);
784 continue;
785 }
786
787 if (item_lsn != commit_lsn) {
788
789 /*
790 * Not a bulk update option due to unusual item_lsn.
791 * Push into AIL immediately, rechecking the lsn once
792 * we have the ail lock. Then unpin the item. This does
793 * not affect the AIL cursor the bulk insert path is
794 * using.
795 */
796 spin_lock(&ailp->ail_lock);
797 if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0)
798 xfs_trans_ail_update(ailp, lip, item_lsn);
799 else
800 spin_unlock(&ailp->ail_lock);
801 if (lip->li_ops->iop_unpin)
802 lip->li_ops->iop_unpin(lip, 0);
803 continue;
804 }
805
806 /* Item is a candidate for bulk AIL insert. */
807 log_items[i++] = lv->lv_item;
808 if (i >= LOG_ITEM_BATCH_SIZE) {
809 xfs_log_item_batch_insert(ailp, &cur, log_items,
810 LOG_ITEM_BATCH_SIZE, commit_lsn);
811 i = 0;
812 }
813 }
814
815 /* make sure we insert the remainder! */
816 if (i)
817 xfs_log_item_batch_insert(ailp, &cur, log_items, i, commit_lsn);
818
819 spin_lock(&ailp->ail_lock);
820 xfs_trans_ail_cursor_done(&cur);
821 spin_unlock(&ailp->ail_lock);
822}
823
824/*
825 * Commit the given transaction to the log.
826 *
827 * XFS disk error handling mechanism is not based on a typical
828 * transaction abort mechanism. Logically after the filesystem
829 * gets marked 'SHUTDOWN', we can't let any new transactions
830 * be durable - ie. committed to disk - because some metadata might
831 * be inconsistent. In such cases, this returns an error, and the
832 * caller may assume that all locked objects joined to the transaction
833 * have already been unlocked as if the commit had succeeded.
834 * Do not reference the transaction structure after this call.
835 */
836static int
837__xfs_trans_commit(
838 struct xfs_trans *tp,
839 bool regrant)
840{
841 struct xfs_mount *mp = tp->t_mountp;
842 xfs_csn_t commit_seq = 0;
843 int error = 0;
844 int sync = tp->t_flags & XFS_TRANS_SYNC;
845
846 trace_xfs_trans_commit(tp, _RET_IP_);
847
848 /*
849 * Finish deferred items on final commit. Only permanent transactions
850 * should ever have deferred ops.
851 */
852 WARN_ON_ONCE(!list_empty(&tp->t_dfops) &&
853 !(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
854 if (!regrant && (tp->t_flags & XFS_TRANS_PERM_LOG_RES)) {
855 error = xfs_defer_finish_noroll(&tp);
856 if (error)
857 goto out_unreserve;
858 }
859
860 /*
861 * If there is nothing to be logged by the transaction,
862 * then unlock all of the items associated with the
863 * transaction and free the transaction structure.
864 * Also make sure to return any reserved blocks to
865 * the free pool.
866 */
867 if (!(tp->t_flags & XFS_TRANS_DIRTY))
868 goto out_unreserve;
869
870 if (XFS_FORCED_SHUTDOWN(mp)) {
871 error = -EIO;
872 goto out_unreserve;
873 }
874
875 ASSERT(tp->t_ticket != NULL);
876
877 /*
878 * If we need to update the superblock, then do it now.
879 */
880 if (tp->t_flags & XFS_TRANS_SB_DIRTY)
881 xfs_trans_apply_sb_deltas(tp);
882 xfs_trans_apply_dquot_deltas(tp);
883
884 xlog_cil_commit(mp->m_log, tp, &commit_seq, regrant);
885
886 xfs_trans_free(tp);
887
888 /*
889 * If the transaction needs to be synchronous, then force the
890 * log out now and wait for it.
891 */
892 if (sync) {
893 error = xfs_log_force_seq(mp, commit_seq, XFS_LOG_SYNC, NULL);
894 XFS_STATS_INC(mp, xs_trans_sync);
895 } else {
896 XFS_STATS_INC(mp, xs_trans_async);
897 }
898
899 return error;
900
901out_unreserve:
902 xfs_trans_unreserve_and_mod_sb(tp);
903
904 /*
905 * It is indeed possible for the transaction to be not dirty but
906 * the dqinfo portion to be. All that means is that we have some
907 * (non-persistent) quota reservations that need to be unreserved.
908 */
909 xfs_trans_unreserve_and_mod_dquots(tp);
910 if (tp->t_ticket) {
911 if (regrant && !XLOG_FORCED_SHUTDOWN(mp->m_log))
912 xfs_log_ticket_regrant(mp->m_log, tp->t_ticket);
913 else
914 xfs_log_ticket_ungrant(mp->m_log, tp->t_ticket);
915 tp->t_ticket = NULL;
916 }
917 xfs_trans_free_items(tp, !!error);
918 xfs_trans_free(tp);
919
920 XFS_STATS_INC(mp, xs_trans_empty);
921 return error;
922}
923
924int
925xfs_trans_commit(
926 struct xfs_trans *tp)
927{
928 return __xfs_trans_commit(tp, false);
929}
930
931/*
932 * Unlock all of the transaction's items and free the transaction.
933 * The transaction must not have modified any of its items, because
934 * there is no way to restore them to their previous state.
935 *
936 * If the transaction has made a log reservation, make sure to release
937 * it as well.
938 */
939void
940xfs_trans_cancel(
941 struct xfs_trans *tp)
942{
943 struct xfs_mount *mp = tp->t_mountp;
944 bool dirty = (tp->t_flags & XFS_TRANS_DIRTY);
945
946 trace_xfs_trans_cancel(tp, _RET_IP_);
947
948 if (tp->t_flags & XFS_TRANS_PERM_LOG_RES)
949 xfs_defer_cancel(tp);
950
951 /*
952 * See if the caller is relying on us to shut down the
953 * filesystem. This happens in paths where we detect
954 * corruption and decide to give up.
955 */
956 if (dirty && !XFS_FORCED_SHUTDOWN(mp)) {
957 XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
958 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
959 }
960#ifdef DEBUG
961 if (!dirty && !XFS_FORCED_SHUTDOWN(mp)) {
962 struct xfs_log_item *lip;
963
964 list_for_each_entry(lip, &tp->t_items, li_trans)
965 ASSERT(!xlog_item_is_intent_done(lip));
966 }
967#endif
968 xfs_trans_unreserve_and_mod_sb(tp);
969 xfs_trans_unreserve_and_mod_dquots(tp);
970
971 if (tp->t_ticket) {
972 xfs_log_ticket_ungrant(mp->m_log, tp->t_ticket);
973 tp->t_ticket = NULL;
974 }
975
976 xfs_trans_free_items(tp, dirty);
977 xfs_trans_free(tp);
978}
979
980/*
981 * Roll from one trans in the sequence of PERMANENT transactions to
982 * the next: permanent transactions are only flushed out when
983 * committed with xfs_trans_commit(), but we still want as soon
984 * as possible to let chunks of it go to the log. So we commit the
985 * chunk we've been working on and get a new transaction to continue.
986 */
987int
988xfs_trans_roll(
989 struct xfs_trans **tpp)
990{
991 struct xfs_trans *trans = *tpp;
992 struct xfs_trans_res tres;
993 int error;
994
995 trace_xfs_trans_roll(trans, _RET_IP_);
996
997 /*
998 * Copy the critical parameters from one trans to the next.
999 */
1000 tres.tr_logres = trans->t_log_res;
1001 tres.tr_logcount = trans->t_log_count;
1002
1003 *tpp = xfs_trans_dup(trans);
1004
1005 /*
1006 * Commit the current transaction.
1007 * If this commit failed, then it'd just unlock those items that
1008 * are not marked ihold. That also means that a filesystem shutdown
1009 * is in progress. The caller takes the responsibility to cancel
1010 * the duplicate transaction that gets returned.
1011 */
1012 error = __xfs_trans_commit(trans, true);
1013 if (error)
1014 return error;
1015
1016 /*
1017 * Reserve space in the log for the next transaction.
1018 * This also pushes items in the "AIL", the list of logged items,
1019 * out to disk if they are taking up space at the tail of the log
1020 * that we want to use. This requires that either nothing be locked
1021 * across this call, or that anything that is locked be logged in
1022 * the prior and the next transactions.
1023 */
1024 tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
1025 return xfs_trans_reserve(*tpp, &tres, 0, 0);
1026}
1027
1028/*
1029 * Allocate an transaction, lock and join the inode to it, and reserve quota.
1030 *
1031 * The caller must ensure that the on-disk dquots attached to this inode have
1032 * already been allocated and initialized. The caller is responsible for
1033 * releasing ILOCK_EXCL if a new transaction is returned.
1034 */
1035int
1036xfs_trans_alloc_inode(
1037 struct xfs_inode *ip,
1038 struct xfs_trans_res *resv,
1039 unsigned int dblocks,
1040 unsigned int rblocks,
1041 bool force,
1042 struct xfs_trans **tpp)
1043{
1044 struct xfs_trans *tp;
1045 struct xfs_mount *mp = ip->i_mount;
1046 bool retried = false;
1047 int error;
1048
1049retry:
1050 error = xfs_trans_alloc(mp, resv, dblocks,
1051 rblocks / mp->m_sb.sb_rextsize,
1052 force ? XFS_TRANS_RESERVE : 0, &tp);
1053 if (error)
1054 return error;
1055
1056 xfs_ilock(ip, XFS_ILOCK_EXCL);
1057 xfs_trans_ijoin(tp, ip, 0);
1058
1059 error = xfs_qm_dqattach_locked(ip, false);
1060 if (error) {
1061 /* Caller should have allocated the dquots! */
1062 ASSERT(error != -ENOENT);
1063 goto out_cancel;
1064 }
1065
1066 error = xfs_trans_reserve_quota_nblks(tp, ip, dblocks, rblocks, force);
1067 if ((error == -EDQUOT || error == -ENOSPC) && !retried) {
1068 xfs_trans_cancel(tp);
1069 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1070 xfs_blockgc_free_quota(ip, 0);
1071 retried = true;
1072 goto retry;
1073 }
1074 if (error)
1075 goto out_cancel;
1076
1077 *tpp = tp;
1078 return 0;
1079
1080out_cancel:
1081 xfs_trans_cancel(tp);
1082 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1083 return error;
1084}
1085
1086/*
1087 * Allocate an transaction in preparation for inode creation by reserving quota
1088 * against the given dquots. Callers are not required to hold any inode locks.
1089 */
1090int
1091xfs_trans_alloc_icreate(
1092 struct xfs_mount *mp,
1093 struct xfs_trans_res *resv,
1094 struct xfs_dquot *udqp,
1095 struct xfs_dquot *gdqp,
1096 struct xfs_dquot *pdqp,
1097 unsigned int dblocks,
1098 struct xfs_trans **tpp)
1099{
1100 struct xfs_trans *tp;
1101 bool retried = false;
1102 int error;
1103
1104retry:
1105 error = xfs_trans_alloc(mp, resv, dblocks, 0, 0, &tp);
1106 if (error)
1107 return error;
1108
1109 error = xfs_trans_reserve_quota_icreate(tp, udqp, gdqp, pdqp, dblocks);
1110 if ((error == -EDQUOT || error == -ENOSPC) && !retried) {
1111 xfs_trans_cancel(tp);
1112 xfs_blockgc_free_dquots(mp, udqp, gdqp, pdqp, 0);
1113 retried = true;
1114 goto retry;
1115 }
1116 if (error) {
1117 xfs_trans_cancel(tp);
1118 return error;
1119 }
1120
1121 *tpp = tp;
1122 return 0;
1123}
1124
1125/*
1126 * Allocate an transaction, lock and join the inode to it, and reserve quota
1127 * in preparation for inode attribute changes that include uid, gid, or prid
1128 * changes.
1129 *
1130 * The caller must ensure that the on-disk dquots attached to this inode have
1131 * already been allocated and initialized. The ILOCK will be dropped when the
1132 * transaction is committed or cancelled.
1133 */
1134int
1135xfs_trans_alloc_ichange(
1136 struct xfs_inode *ip,
1137 struct xfs_dquot *new_udqp,
1138 struct xfs_dquot *new_gdqp,
1139 struct xfs_dquot *new_pdqp,
1140 bool force,
1141 struct xfs_trans **tpp)
1142{
1143 struct xfs_trans *tp;
1144 struct xfs_mount *mp = ip->i_mount;
1145 struct xfs_dquot *udqp;
1146 struct xfs_dquot *gdqp;
1147 struct xfs_dquot *pdqp;
1148 bool retried = false;
1149 int error;
1150
1151retry:
1152 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
1153 if (error)
1154 return error;
1155
1156 xfs_ilock(ip, XFS_ILOCK_EXCL);
1157 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1158
1159 error = xfs_qm_dqattach_locked(ip, false);
1160 if (error) {
1161 /* Caller should have allocated the dquots! */
1162 ASSERT(error != -ENOENT);
1163 goto out_cancel;
1164 }
1165
1166 /*
1167 * For each quota type, skip quota reservations if the inode's dquots
1168 * now match the ones that came from the caller, or the caller didn't
1169 * pass one in. The inode's dquots can change if we drop the ILOCK to
1170 * perform a blockgc scan, so we must preserve the caller's arguments.
1171 */
1172 udqp = (new_udqp != ip->i_udquot) ? new_udqp : NULL;
1173 gdqp = (new_gdqp != ip->i_gdquot) ? new_gdqp : NULL;
1174 pdqp = (new_pdqp != ip->i_pdquot) ? new_pdqp : NULL;
1175 if (udqp || gdqp || pdqp) {
1176 unsigned int qflags = XFS_QMOPT_RES_REGBLKS;
1177
1178 if (force)
1179 qflags |= XFS_QMOPT_FORCE_RES;
1180
1181 /*
1182 * Reserve enough quota to handle blocks on disk and reserved
1183 * for a delayed allocation. We'll actually transfer the
1184 * delalloc reservation between dquots at chown time, even
1185 * though that part is only semi-transactional.
1186 */
1187 error = xfs_trans_reserve_quota_bydquots(tp, mp, udqp, gdqp,
1188 pdqp, ip->i_nblocks + ip->i_delayed_blks,
1189 1, qflags);
1190 if ((error == -EDQUOT || error == -ENOSPC) && !retried) {
1191 xfs_trans_cancel(tp);
1192 xfs_blockgc_free_dquots(mp, udqp, gdqp, pdqp, 0);
1193 retried = true;
1194 goto retry;
1195 }
1196 if (error)
1197 goto out_cancel;
1198 }
1199
1200 *tpp = tp;
1201 return 0;
1202
1203out_cancel:
1204 xfs_trans_cancel(tp);
1205 return error;
1206}