Loading...
1/*
2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * Copyright (C) 2010 Red Hat, Inc.
4 * All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it would be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19#include "xfs.h"
20#include "xfs_fs.h"
21#include "xfs_shared.h"
22#include "xfs_format.h"
23#include "xfs_log_format.h"
24#include "xfs_trans_resv.h"
25#include "xfs_mount.h"
26#include "xfs_inode.h"
27#include "xfs_extent_busy.h"
28#include "xfs_quota.h"
29#include "xfs_trans.h"
30#include "xfs_trans_priv.h"
31#include "xfs_log.h"
32#include "xfs_trace.h"
33#include "xfs_error.h"
34
35kmem_zone_t *xfs_trans_zone;
36kmem_zone_t *xfs_log_item_desc_zone;
37
38#if defined(CONFIG_TRACEPOINTS)
39static void
40xfs_trans_trace_reservations(
41 struct xfs_mount *mp)
42{
43 struct xfs_trans_res resv;
44 struct xfs_trans_res *res;
45 struct xfs_trans_res *end_res;
46 int i;
47
48 res = (struct xfs_trans_res *)M_RES(mp);
49 end_res = (struct xfs_trans_res *)(M_RES(mp) + 1);
50 for (i = 0; res < end_res; i++, res++)
51 trace_xfs_trans_resv_calc(mp, i, res);
52 xfs_log_get_max_trans_res(mp, &resv);
53 trace_xfs_trans_resv_calc(mp, -1, &resv);
54}
55#else
56# define xfs_trans_trace_reservations(mp)
57#endif
58
59/*
60 * Initialize the precomputed transaction reservation values
61 * in the mount structure.
62 */
63void
64xfs_trans_init(
65 struct xfs_mount *mp)
66{
67 xfs_trans_resv_calc(mp, M_RES(mp));
68 xfs_trans_trace_reservations(mp);
69}
70
71/*
72 * Free the transaction structure. If there is more clean up
73 * to do when the structure is freed, add it here.
74 */
75STATIC void
76xfs_trans_free(
77 struct xfs_trans *tp)
78{
79 xfs_extent_busy_sort(&tp->t_busy);
80 xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false);
81
82 atomic_dec(&tp->t_mountp->m_active_trans);
83 if (!(tp->t_flags & XFS_TRANS_NO_WRITECOUNT))
84 sb_end_intwrite(tp->t_mountp->m_super);
85 xfs_trans_free_dqinfo(tp);
86 kmem_zone_free(xfs_trans_zone, tp);
87}
88
89/*
90 * This is called to create a new transaction which will share the
91 * permanent log reservation of the given transaction. The remaining
92 * unused block and rt extent reservations are also inherited. This
93 * implies that the original transaction is no longer allowed to allocate
94 * blocks. Locks and log items, however, are no inherited. They must
95 * be added to the new transaction explicitly.
96 */
97STATIC xfs_trans_t *
98xfs_trans_dup(
99 xfs_trans_t *tp)
100{
101 xfs_trans_t *ntp;
102
103 ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
104
105 /*
106 * Initialize the new transaction structure.
107 */
108 ntp->t_magic = XFS_TRANS_HEADER_MAGIC;
109 ntp->t_mountp = tp->t_mountp;
110 INIT_LIST_HEAD(&ntp->t_items);
111 INIT_LIST_HEAD(&ntp->t_busy);
112
113 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
114 ASSERT(tp->t_ticket != NULL);
115
116 ntp->t_flags = XFS_TRANS_PERM_LOG_RES |
117 (tp->t_flags & XFS_TRANS_RESERVE) |
118 (tp->t_flags & XFS_TRANS_NO_WRITECOUNT);
119 /* We gave our writer reference to the new transaction */
120 tp->t_flags |= XFS_TRANS_NO_WRITECOUNT;
121 ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
122
123 ASSERT(tp->t_blk_res >= tp->t_blk_res_used);
124 ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
125 tp->t_blk_res = tp->t_blk_res_used;
126
127 ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
128 tp->t_rtx_res = tp->t_rtx_res_used;
129 ntp->t_pflags = tp->t_pflags;
130
131 xfs_trans_dup_dqinfo(tp, ntp);
132
133 atomic_inc(&tp->t_mountp->m_active_trans);
134 return ntp;
135}
136
137/*
138 * This is called to reserve free disk blocks and log space for the
139 * given transaction. This must be done before allocating any resources
140 * within the transaction.
141 *
142 * This will return ENOSPC if there are not enough blocks available.
143 * It will sleep waiting for available log space.
144 * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
145 * is used by long running transactions. If any one of the reservations
146 * fails then they will all be backed out.
147 *
148 * This does not do quota reservations. That typically is done by the
149 * caller afterwards.
150 */
151static int
152xfs_trans_reserve(
153 struct xfs_trans *tp,
154 struct xfs_trans_res *resp,
155 uint blocks,
156 uint rtextents)
157{
158 int error = 0;
159 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
160
161 /* Mark this thread as being in a transaction */
162 current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
163
164 /*
165 * Attempt to reserve the needed disk blocks by decrementing
166 * the number needed from the number available. This will
167 * fail if the count would go below zero.
168 */
169 if (blocks > 0) {
170 error = xfs_mod_fdblocks(tp->t_mountp, -((int64_t)blocks), rsvd);
171 if (error != 0) {
172 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
173 return -ENOSPC;
174 }
175 tp->t_blk_res += blocks;
176 }
177
178 /*
179 * Reserve the log space needed for this transaction.
180 */
181 if (resp->tr_logres > 0) {
182 bool permanent = false;
183
184 ASSERT(tp->t_log_res == 0 ||
185 tp->t_log_res == resp->tr_logres);
186 ASSERT(tp->t_log_count == 0 ||
187 tp->t_log_count == resp->tr_logcount);
188
189 if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
190 tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
191 permanent = true;
192 } else {
193 ASSERT(tp->t_ticket == NULL);
194 ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
195 }
196
197 if (tp->t_ticket != NULL) {
198 ASSERT(resp->tr_logflags & XFS_TRANS_PERM_LOG_RES);
199 error = xfs_log_regrant(tp->t_mountp, tp->t_ticket);
200 } else {
201 error = xfs_log_reserve(tp->t_mountp,
202 resp->tr_logres,
203 resp->tr_logcount,
204 &tp->t_ticket, XFS_TRANSACTION,
205 permanent);
206 }
207
208 if (error)
209 goto undo_blocks;
210
211 tp->t_log_res = resp->tr_logres;
212 tp->t_log_count = resp->tr_logcount;
213 }
214
215 /*
216 * Attempt to reserve the needed realtime extents by decrementing
217 * the number needed from the number available. This will
218 * fail if the count would go below zero.
219 */
220 if (rtextents > 0) {
221 error = xfs_mod_frextents(tp->t_mountp, -((int64_t)rtextents));
222 if (error) {
223 error = -ENOSPC;
224 goto undo_log;
225 }
226 tp->t_rtx_res += rtextents;
227 }
228
229 return 0;
230
231 /*
232 * Error cases jump to one of these labels to undo any
233 * reservations which have already been performed.
234 */
235undo_log:
236 if (resp->tr_logres > 0) {
237 xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, false);
238 tp->t_ticket = NULL;
239 tp->t_log_res = 0;
240 tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
241 }
242
243undo_blocks:
244 if (blocks > 0) {
245 xfs_mod_fdblocks(tp->t_mountp, (int64_t)blocks, rsvd);
246 tp->t_blk_res = 0;
247 }
248
249 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
250
251 return error;
252}
253
254int
255xfs_trans_alloc(
256 struct xfs_mount *mp,
257 struct xfs_trans_res *resp,
258 uint blocks,
259 uint rtextents,
260 uint flags,
261 struct xfs_trans **tpp)
262{
263 struct xfs_trans *tp;
264 int error;
265
266 if (!(flags & XFS_TRANS_NO_WRITECOUNT))
267 sb_start_intwrite(mp->m_super);
268
269 WARN_ON(mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
270 atomic_inc(&mp->m_active_trans);
271
272 tp = kmem_zone_zalloc(xfs_trans_zone,
273 (flags & XFS_TRANS_NOFS) ? KM_NOFS : KM_SLEEP);
274 tp->t_magic = XFS_TRANS_HEADER_MAGIC;
275 tp->t_flags = flags;
276 tp->t_mountp = mp;
277 INIT_LIST_HEAD(&tp->t_items);
278 INIT_LIST_HEAD(&tp->t_busy);
279
280 error = xfs_trans_reserve(tp, resp, blocks, rtextents);
281 if (error) {
282 xfs_trans_cancel(tp);
283 return error;
284 }
285
286 *tpp = tp;
287 return 0;
288}
289
290/*
291 * Create an empty transaction with no reservation. This is a defensive
292 * mechanism for routines that query metadata without actually modifying
293 * them -- if the metadata being queried is somehow cross-linked (think a
294 * btree block pointer that points higher in the tree), we risk deadlock.
295 * However, blocks grabbed as part of a transaction can be re-grabbed.
296 * The verifiers will notice the corrupt block and the operation will fail
297 * back to userspace without deadlocking.
298 *
299 * Note the zero-length reservation; this transaction MUST be cancelled
300 * without any dirty data.
301 */
302int
303xfs_trans_alloc_empty(
304 struct xfs_mount *mp,
305 struct xfs_trans **tpp)
306{
307 struct xfs_trans_res resv = {0};
308
309 return xfs_trans_alloc(mp, &resv, 0, 0, XFS_TRANS_NO_WRITECOUNT, tpp);
310}
311
312/*
313 * Record the indicated change to the given field for application
314 * to the file system's superblock when the transaction commits.
315 * For now, just store the change in the transaction structure.
316 *
317 * Mark the transaction structure to indicate that the superblock
318 * needs to be updated before committing.
319 *
320 * Because we may not be keeping track of allocated/free inodes and
321 * used filesystem blocks in the superblock, we do not mark the
322 * superblock dirty in this transaction if we modify these fields.
323 * We still need to update the transaction deltas so that they get
324 * applied to the incore superblock, but we don't want them to
325 * cause the superblock to get locked and logged if these are the
326 * only fields in the superblock that the transaction modifies.
327 */
328void
329xfs_trans_mod_sb(
330 xfs_trans_t *tp,
331 uint field,
332 int64_t delta)
333{
334 uint32_t flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
335 xfs_mount_t *mp = tp->t_mountp;
336
337 switch (field) {
338 case XFS_TRANS_SB_ICOUNT:
339 tp->t_icount_delta += delta;
340 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
341 flags &= ~XFS_TRANS_SB_DIRTY;
342 break;
343 case XFS_TRANS_SB_IFREE:
344 tp->t_ifree_delta += delta;
345 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
346 flags &= ~XFS_TRANS_SB_DIRTY;
347 break;
348 case XFS_TRANS_SB_FDBLOCKS:
349 /*
350 * Track the number of blocks allocated in the transaction.
351 * Make sure it does not exceed the number reserved. If so,
352 * shutdown as this can lead to accounting inconsistency.
353 */
354 if (delta < 0) {
355 tp->t_blk_res_used += (uint)-delta;
356 if (tp->t_blk_res_used > tp->t_blk_res)
357 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
358 }
359 tp->t_fdblocks_delta += delta;
360 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
361 flags &= ~XFS_TRANS_SB_DIRTY;
362 break;
363 case XFS_TRANS_SB_RES_FDBLOCKS:
364 /*
365 * The allocation has already been applied to the
366 * in-core superblock's counter. This should only
367 * be applied to the on-disk superblock.
368 */
369 tp->t_res_fdblocks_delta += delta;
370 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
371 flags &= ~XFS_TRANS_SB_DIRTY;
372 break;
373 case XFS_TRANS_SB_FREXTENTS:
374 /*
375 * Track the number of blocks allocated in the
376 * transaction. Make sure it does not exceed the
377 * number reserved.
378 */
379 if (delta < 0) {
380 tp->t_rtx_res_used += (uint)-delta;
381 ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
382 }
383 tp->t_frextents_delta += delta;
384 break;
385 case XFS_TRANS_SB_RES_FREXTENTS:
386 /*
387 * The allocation has already been applied to the
388 * in-core superblock's counter. This should only
389 * be applied to the on-disk superblock.
390 */
391 ASSERT(delta < 0);
392 tp->t_res_frextents_delta += delta;
393 break;
394 case XFS_TRANS_SB_DBLOCKS:
395 ASSERT(delta > 0);
396 tp->t_dblocks_delta += delta;
397 break;
398 case XFS_TRANS_SB_AGCOUNT:
399 ASSERT(delta > 0);
400 tp->t_agcount_delta += delta;
401 break;
402 case XFS_TRANS_SB_IMAXPCT:
403 tp->t_imaxpct_delta += delta;
404 break;
405 case XFS_TRANS_SB_REXTSIZE:
406 tp->t_rextsize_delta += delta;
407 break;
408 case XFS_TRANS_SB_RBMBLOCKS:
409 tp->t_rbmblocks_delta += delta;
410 break;
411 case XFS_TRANS_SB_RBLOCKS:
412 tp->t_rblocks_delta += delta;
413 break;
414 case XFS_TRANS_SB_REXTENTS:
415 tp->t_rextents_delta += delta;
416 break;
417 case XFS_TRANS_SB_REXTSLOG:
418 tp->t_rextslog_delta += delta;
419 break;
420 default:
421 ASSERT(0);
422 return;
423 }
424
425 tp->t_flags |= flags;
426}
427
428/*
429 * xfs_trans_apply_sb_deltas() is called from the commit code
430 * to bring the superblock buffer into the current transaction
431 * and modify it as requested by earlier calls to xfs_trans_mod_sb().
432 *
433 * For now we just look at each field allowed to change and change
434 * it if necessary.
435 */
436STATIC void
437xfs_trans_apply_sb_deltas(
438 xfs_trans_t *tp)
439{
440 xfs_dsb_t *sbp;
441 xfs_buf_t *bp;
442 int whole = 0;
443
444 bp = xfs_trans_getsb(tp, tp->t_mountp, 0);
445 sbp = XFS_BUF_TO_SBP(bp);
446
447 /*
448 * Check that superblock mods match the mods made to AGF counters.
449 */
450 ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
451 (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
452 tp->t_ag_btree_delta));
453
454 /*
455 * Only update the superblock counters if we are logging them
456 */
457 if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
458 if (tp->t_icount_delta)
459 be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
460 if (tp->t_ifree_delta)
461 be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
462 if (tp->t_fdblocks_delta)
463 be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
464 if (tp->t_res_fdblocks_delta)
465 be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
466 }
467
468 if (tp->t_frextents_delta)
469 be64_add_cpu(&sbp->sb_frextents, tp->t_frextents_delta);
470 if (tp->t_res_frextents_delta)
471 be64_add_cpu(&sbp->sb_frextents, tp->t_res_frextents_delta);
472
473 if (tp->t_dblocks_delta) {
474 be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
475 whole = 1;
476 }
477 if (tp->t_agcount_delta) {
478 be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
479 whole = 1;
480 }
481 if (tp->t_imaxpct_delta) {
482 sbp->sb_imax_pct += tp->t_imaxpct_delta;
483 whole = 1;
484 }
485 if (tp->t_rextsize_delta) {
486 be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
487 whole = 1;
488 }
489 if (tp->t_rbmblocks_delta) {
490 be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
491 whole = 1;
492 }
493 if (tp->t_rblocks_delta) {
494 be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
495 whole = 1;
496 }
497 if (tp->t_rextents_delta) {
498 be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
499 whole = 1;
500 }
501 if (tp->t_rextslog_delta) {
502 sbp->sb_rextslog += tp->t_rextslog_delta;
503 whole = 1;
504 }
505
506 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
507 if (whole)
508 /*
509 * Log the whole thing, the fields are noncontiguous.
510 */
511 xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
512 else
513 /*
514 * Since all the modifiable fields are contiguous, we
515 * can get away with this.
516 */
517 xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
518 offsetof(xfs_dsb_t, sb_frextents) +
519 sizeof(sbp->sb_frextents) - 1);
520}
521
522STATIC int
523xfs_sb_mod8(
524 uint8_t *field,
525 int8_t delta)
526{
527 int8_t counter = *field;
528
529 counter += delta;
530 if (counter < 0) {
531 ASSERT(0);
532 return -EINVAL;
533 }
534 *field = counter;
535 return 0;
536}
537
538STATIC int
539xfs_sb_mod32(
540 uint32_t *field,
541 int32_t delta)
542{
543 int32_t counter = *field;
544
545 counter += delta;
546 if (counter < 0) {
547 ASSERT(0);
548 return -EINVAL;
549 }
550 *field = counter;
551 return 0;
552}
553
554STATIC int
555xfs_sb_mod64(
556 uint64_t *field,
557 int64_t delta)
558{
559 int64_t counter = *field;
560
561 counter += delta;
562 if (counter < 0) {
563 ASSERT(0);
564 return -EINVAL;
565 }
566 *field = counter;
567 return 0;
568}
569
570/*
571 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations
572 * and apply superblock counter changes to the in-core superblock. The
573 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
574 * applied to the in-core superblock. The idea is that that has already been
575 * done.
576 *
577 * If we are not logging superblock counters, then the inode allocated/free and
578 * used block counts are not updated in the on disk superblock. In this case,
579 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
580 * still need to update the incore superblock with the changes.
581 */
582void
583xfs_trans_unreserve_and_mod_sb(
584 struct xfs_trans *tp)
585{
586 struct xfs_mount *mp = tp->t_mountp;
587 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
588 int64_t blkdelta = 0;
589 int64_t rtxdelta = 0;
590 int64_t idelta = 0;
591 int64_t ifreedelta = 0;
592 int error;
593
594 /* calculate deltas */
595 if (tp->t_blk_res > 0)
596 blkdelta = tp->t_blk_res;
597 if ((tp->t_fdblocks_delta != 0) &&
598 (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
599 (tp->t_flags & XFS_TRANS_SB_DIRTY)))
600 blkdelta += tp->t_fdblocks_delta;
601
602 if (tp->t_rtx_res > 0)
603 rtxdelta = tp->t_rtx_res;
604 if ((tp->t_frextents_delta != 0) &&
605 (tp->t_flags & XFS_TRANS_SB_DIRTY))
606 rtxdelta += tp->t_frextents_delta;
607
608 if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
609 (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
610 idelta = tp->t_icount_delta;
611 ifreedelta = tp->t_ifree_delta;
612 }
613
614 /* apply the per-cpu counters */
615 if (blkdelta) {
616 error = xfs_mod_fdblocks(mp, blkdelta, rsvd);
617 if (error)
618 goto out;
619 }
620
621 if (idelta) {
622 error = xfs_mod_icount(mp, idelta);
623 if (error)
624 goto out_undo_fdblocks;
625 }
626
627 if (ifreedelta) {
628 error = xfs_mod_ifree(mp, ifreedelta);
629 if (error)
630 goto out_undo_icount;
631 }
632
633 if (rtxdelta == 0 && !(tp->t_flags & XFS_TRANS_SB_DIRTY))
634 return;
635
636 /* apply remaining deltas */
637 spin_lock(&mp->m_sb_lock);
638 if (rtxdelta) {
639 error = xfs_sb_mod64(&mp->m_sb.sb_frextents, rtxdelta);
640 if (error)
641 goto out_undo_ifree;
642 }
643
644 if (tp->t_dblocks_delta != 0) {
645 error = xfs_sb_mod64(&mp->m_sb.sb_dblocks, tp->t_dblocks_delta);
646 if (error)
647 goto out_undo_frextents;
648 }
649 if (tp->t_agcount_delta != 0) {
650 error = xfs_sb_mod32(&mp->m_sb.sb_agcount, tp->t_agcount_delta);
651 if (error)
652 goto out_undo_dblocks;
653 }
654 if (tp->t_imaxpct_delta != 0) {
655 error = xfs_sb_mod8(&mp->m_sb.sb_imax_pct, tp->t_imaxpct_delta);
656 if (error)
657 goto out_undo_agcount;
658 }
659 if (tp->t_rextsize_delta != 0) {
660 error = xfs_sb_mod32(&mp->m_sb.sb_rextsize,
661 tp->t_rextsize_delta);
662 if (error)
663 goto out_undo_imaxpct;
664 }
665 if (tp->t_rbmblocks_delta != 0) {
666 error = xfs_sb_mod32(&mp->m_sb.sb_rbmblocks,
667 tp->t_rbmblocks_delta);
668 if (error)
669 goto out_undo_rextsize;
670 }
671 if (tp->t_rblocks_delta != 0) {
672 error = xfs_sb_mod64(&mp->m_sb.sb_rblocks, tp->t_rblocks_delta);
673 if (error)
674 goto out_undo_rbmblocks;
675 }
676 if (tp->t_rextents_delta != 0) {
677 error = xfs_sb_mod64(&mp->m_sb.sb_rextents,
678 tp->t_rextents_delta);
679 if (error)
680 goto out_undo_rblocks;
681 }
682 if (tp->t_rextslog_delta != 0) {
683 error = xfs_sb_mod8(&mp->m_sb.sb_rextslog,
684 tp->t_rextslog_delta);
685 if (error)
686 goto out_undo_rextents;
687 }
688 spin_unlock(&mp->m_sb_lock);
689 return;
690
691out_undo_rextents:
692 if (tp->t_rextents_delta)
693 xfs_sb_mod64(&mp->m_sb.sb_rextents, -tp->t_rextents_delta);
694out_undo_rblocks:
695 if (tp->t_rblocks_delta)
696 xfs_sb_mod64(&mp->m_sb.sb_rblocks, -tp->t_rblocks_delta);
697out_undo_rbmblocks:
698 if (tp->t_rbmblocks_delta)
699 xfs_sb_mod32(&mp->m_sb.sb_rbmblocks, -tp->t_rbmblocks_delta);
700out_undo_rextsize:
701 if (tp->t_rextsize_delta)
702 xfs_sb_mod32(&mp->m_sb.sb_rextsize, -tp->t_rextsize_delta);
703out_undo_imaxpct:
704 if (tp->t_rextsize_delta)
705 xfs_sb_mod8(&mp->m_sb.sb_imax_pct, -tp->t_imaxpct_delta);
706out_undo_agcount:
707 if (tp->t_agcount_delta)
708 xfs_sb_mod32(&mp->m_sb.sb_agcount, -tp->t_agcount_delta);
709out_undo_dblocks:
710 if (tp->t_dblocks_delta)
711 xfs_sb_mod64(&mp->m_sb.sb_dblocks, -tp->t_dblocks_delta);
712out_undo_frextents:
713 if (rtxdelta)
714 xfs_sb_mod64(&mp->m_sb.sb_frextents, -rtxdelta);
715out_undo_ifree:
716 spin_unlock(&mp->m_sb_lock);
717 if (ifreedelta)
718 xfs_mod_ifree(mp, -ifreedelta);
719out_undo_icount:
720 if (idelta)
721 xfs_mod_icount(mp, -idelta);
722out_undo_fdblocks:
723 if (blkdelta)
724 xfs_mod_fdblocks(mp, -blkdelta, rsvd);
725out:
726 ASSERT(error == 0);
727 return;
728}
729
730/*
731 * Add the given log item to the transaction's list of log items.
732 *
733 * The log item will now point to its new descriptor with its li_desc field.
734 */
735void
736xfs_trans_add_item(
737 struct xfs_trans *tp,
738 struct xfs_log_item *lip)
739{
740 struct xfs_log_item_desc *lidp;
741
742 ASSERT(lip->li_mountp == tp->t_mountp);
743 ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
744
745 lidp = kmem_zone_zalloc(xfs_log_item_desc_zone, KM_SLEEP | KM_NOFS);
746
747 lidp->lid_item = lip;
748 lidp->lid_flags = 0;
749 list_add_tail(&lidp->lid_trans, &tp->t_items);
750
751 lip->li_desc = lidp;
752}
753
754STATIC void
755xfs_trans_free_item_desc(
756 struct xfs_log_item_desc *lidp)
757{
758 list_del_init(&lidp->lid_trans);
759 kmem_zone_free(xfs_log_item_desc_zone, lidp);
760}
761
762/*
763 * Unlink and free the given descriptor.
764 */
765void
766xfs_trans_del_item(
767 struct xfs_log_item *lip)
768{
769 xfs_trans_free_item_desc(lip->li_desc);
770 lip->li_desc = NULL;
771}
772
773/*
774 * Unlock all of the items of a transaction and free all the descriptors
775 * of that transaction.
776 */
777void
778xfs_trans_free_items(
779 struct xfs_trans *tp,
780 xfs_lsn_t commit_lsn,
781 bool abort)
782{
783 struct xfs_log_item_desc *lidp, *next;
784
785 list_for_each_entry_safe(lidp, next, &tp->t_items, lid_trans) {
786 struct xfs_log_item *lip = lidp->lid_item;
787
788 lip->li_desc = NULL;
789
790 if (commit_lsn != NULLCOMMITLSN)
791 lip->li_ops->iop_committing(lip, commit_lsn);
792 if (abort)
793 lip->li_flags |= XFS_LI_ABORTED;
794 lip->li_ops->iop_unlock(lip);
795
796 xfs_trans_free_item_desc(lidp);
797 }
798}
799
800static inline void
801xfs_log_item_batch_insert(
802 struct xfs_ail *ailp,
803 struct xfs_ail_cursor *cur,
804 struct xfs_log_item **log_items,
805 int nr_items,
806 xfs_lsn_t commit_lsn)
807{
808 int i;
809
810 spin_lock(&ailp->ail_lock);
811 /* xfs_trans_ail_update_bulk drops ailp->ail_lock */
812 xfs_trans_ail_update_bulk(ailp, cur, log_items, nr_items, commit_lsn);
813
814 for (i = 0; i < nr_items; i++) {
815 struct xfs_log_item *lip = log_items[i];
816
817 lip->li_ops->iop_unpin(lip, 0);
818 }
819}
820
821/*
822 * Bulk operation version of xfs_trans_committed that takes a log vector of
823 * items to insert into the AIL. This uses bulk AIL insertion techniques to
824 * minimise lock traffic.
825 *
826 * If we are called with the aborted flag set, it is because a log write during
827 * a CIL checkpoint commit has failed. In this case, all the items in the
828 * checkpoint have already gone through iop_commited and iop_unlock, which
829 * means that checkpoint commit abort handling is treated exactly the same
830 * as an iclog write error even though we haven't started any IO yet. Hence in
831 * this case all we need to do is iop_committed processing, followed by an
832 * iop_unpin(aborted) call.
833 *
834 * The AIL cursor is used to optimise the insert process. If commit_lsn is not
835 * at the end of the AIL, the insert cursor avoids the need to walk
836 * the AIL to find the insertion point on every xfs_log_item_batch_insert()
837 * call. This saves a lot of needless list walking and is a net win, even
838 * though it slightly increases that amount of AIL lock traffic to set it up
839 * and tear it down.
840 */
841void
842xfs_trans_committed_bulk(
843 struct xfs_ail *ailp,
844 struct xfs_log_vec *log_vector,
845 xfs_lsn_t commit_lsn,
846 int aborted)
847{
848#define LOG_ITEM_BATCH_SIZE 32
849 struct xfs_log_item *log_items[LOG_ITEM_BATCH_SIZE];
850 struct xfs_log_vec *lv;
851 struct xfs_ail_cursor cur;
852 int i = 0;
853
854 spin_lock(&ailp->ail_lock);
855 xfs_trans_ail_cursor_last(ailp, &cur, commit_lsn);
856 spin_unlock(&ailp->ail_lock);
857
858 /* unpin all the log items */
859 for (lv = log_vector; lv; lv = lv->lv_next ) {
860 struct xfs_log_item *lip = lv->lv_item;
861 xfs_lsn_t item_lsn;
862
863 if (aborted)
864 lip->li_flags |= XFS_LI_ABORTED;
865 item_lsn = lip->li_ops->iop_committed(lip, commit_lsn);
866
867 /* item_lsn of -1 means the item needs no further processing */
868 if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
869 continue;
870
871 /*
872 * if we are aborting the operation, no point in inserting the
873 * object into the AIL as we are in a shutdown situation.
874 */
875 if (aborted) {
876 ASSERT(XFS_FORCED_SHUTDOWN(ailp->ail_mount));
877 lip->li_ops->iop_unpin(lip, 1);
878 continue;
879 }
880
881 if (item_lsn != commit_lsn) {
882
883 /*
884 * Not a bulk update option due to unusual item_lsn.
885 * Push into AIL immediately, rechecking the lsn once
886 * we have the ail lock. Then unpin the item. This does
887 * not affect the AIL cursor the bulk insert path is
888 * using.
889 */
890 spin_lock(&ailp->ail_lock);
891 if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0)
892 xfs_trans_ail_update(ailp, lip, item_lsn);
893 else
894 spin_unlock(&ailp->ail_lock);
895 lip->li_ops->iop_unpin(lip, 0);
896 continue;
897 }
898
899 /* Item is a candidate for bulk AIL insert. */
900 log_items[i++] = lv->lv_item;
901 if (i >= LOG_ITEM_BATCH_SIZE) {
902 xfs_log_item_batch_insert(ailp, &cur, log_items,
903 LOG_ITEM_BATCH_SIZE, commit_lsn);
904 i = 0;
905 }
906 }
907
908 /* make sure we insert the remainder! */
909 if (i)
910 xfs_log_item_batch_insert(ailp, &cur, log_items, i, commit_lsn);
911
912 spin_lock(&ailp->ail_lock);
913 xfs_trans_ail_cursor_done(&cur);
914 spin_unlock(&ailp->ail_lock);
915}
916
917/*
918 * Commit the given transaction to the log.
919 *
920 * XFS disk error handling mechanism is not based on a typical
921 * transaction abort mechanism. Logically after the filesystem
922 * gets marked 'SHUTDOWN', we can't let any new transactions
923 * be durable - ie. committed to disk - because some metadata might
924 * be inconsistent. In such cases, this returns an error, and the
925 * caller may assume that all locked objects joined to the transaction
926 * have already been unlocked as if the commit had succeeded.
927 * Do not reference the transaction structure after this call.
928 */
929static int
930__xfs_trans_commit(
931 struct xfs_trans *tp,
932 bool regrant)
933{
934 struct xfs_mount *mp = tp->t_mountp;
935 xfs_lsn_t commit_lsn = -1;
936 int error = 0;
937 int sync = tp->t_flags & XFS_TRANS_SYNC;
938
939 /*
940 * If there is nothing to be logged by the transaction,
941 * then unlock all of the items associated with the
942 * transaction and free the transaction structure.
943 * Also make sure to return any reserved blocks to
944 * the free pool.
945 */
946 if (!(tp->t_flags & XFS_TRANS_DIRTY))
947 goto out_unreserve;
948
949 if (XFS_FORCED_SHUTDOWN(mp)) {
950 error = -EIO;
951 goto out_unreserve;
952 }
953
954 ASSERT(tp->t_ticket != NULL);
955
956 /*
957 * If we need to update the superblock, then do it now.
958 */
959 if (tp->t_flags & XFS_TRANS_SB_DIRTY)
960 xfs_trans_apply_sb_deltas(tp);
961 xfs_trans_apply_dquot_deltas(tp);
962
963 xfs_log_commit_cil(mp, tp, &commit_lsn, regrant);
964
965 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
966 xfs_trans_free(tp);
967
968 /*
969 * If the transaction needs to be synchronous, then force the
970 * log out now and wait for it.
971 */
972 if (sync) {
973 error = xfs_log_force_lsn(mp, commit_lsn, XFS_LOG_SYNC, NULL);
974 XFS_STATS_INC(mp, xs_trans_sync);
975 } else {
976 XFS_STATS_INC(mp, xs_trans_async);
977 }
978
979 return error;
980
981out_unreserve:
982 xfs_trans_unreserve_and_mod_sb(tp);
983
984 /*
985 * It is indeed possible for the transaction to be not dirty but
986 * the dqinfo portion to be. All that means is that we have some
987 * (non-persistent) quota reservations that need to be unreserved.
988 */
989 xfs_trans_unreserve_and_mod_dquots(tp);
990 if (tp->t_ticket) {
991 commit_lsn = xfs_log_done(mp, tp->t_ticket, NULL, regrant);
992 if (commit_lsn == -1 && !error)
993 error = -EIO;
994 }
995 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
996 xfs_trans_free_items(tp, NULLCOMMITLSN, !!error);
997 xfs_trans_free(tp);
998
999 XFS_STATS_INC(mp, xs_trans_empty);
1000 return error;
1001}
1002
1003int
1004xfs_trans_commit(
1005 struct xfs_trans *tp)
1006{
1007 return __xfs_trans_commit(tp, false);
1008}
1009
1010/*
1011 * Unlock all of the transaction's items and free the transaction.
1012 * The transaction must not have modified any of its items, because
1013 * there is no way to restore them to their previous state.
1014 *
1015 * If the transaction has made a log reservation, make sure to release
1016 * it as well.
1017 */
1018void
1019xfs_trans_cancel(
1020 struct xfs_trans *tp)
1021{
1022 struct xfs_mount *mp = tp->t_mountp;
1023 bool dirty = (tp->t_flags & XFS_TRANS_DIRTY);
1024
1025 /*
1026 * See if the caller is relying on us to shut down the
1027 * filesystem. This happens in paths where we detect
1028 * corruption and decide to give up.
1029 */
1030 if (dirty && !XFS_FORCED_SHUTDOWN(mp)) {
1031 XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
1032 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1033 }
1034#ifdef DEBUG
1035 if (!dirty && !XFS_FORCED_SHUTDOWN(mp)) {
1036 struct xfs_log_item_desc *lidp;
1037
1038 list_for_each_entry(lidp, &tp->t_items, lid_trans)
1039 ASSERT(!(lidp->lid_item->li_type == XFS_LI_EFD));
1040 }
1041#endif
1042 xfs_trans_unreserve_and_mod_sb(tp);
1043 xfs_trans_unreserve_and_mod_dquots(tp);
1044
1045 if (tp->t_ticket)
1046 xfs_log_done(mp, tp->t_ticket, NULL, false);
1047
1048 /* mark this thread as no longer being in a transaction */
1049 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
1050
1051 xfs_trans_free_items(tp, NULLCOMMITLSN, dirty);
1052 xfs_trans_free(tp);
1053}
1054
1055/*
1056 * Roll from one trans in the sequence of PERMANENT transactions to
1057 * the next: permanent transactions are only flushed out when
1058 * committed with xfs_trans_commit(), but we still want as soon
1059 * as possible to let chunks of it go to the log. So we commit the
1060 * chunk we've been working on and get a new transaction to continue.
1061 */
1062int
1063xfs_trans_roll(
1064 struct xfs_trans **tpp)
1065{
1066 struct xfs_trans *trans = *tpp;
1067 struct xfs_trans_res tres;
1068 int error;
1069
1070 /*
1071 * Copy the critical parameters from one trans to the next.
1072 */
1073 tres.tr_logres = trans->t_log_res;
1074 tres.tr_logcount = trans->t_log_count;
1075
1076 *tpp = xfs_trans_dup(trans);
1077
1078 /*
1079 * Commit the current transaction.
1080 * If this commit failed, then it'd just unlock those items that
1081 * are not marked ihold. That also means that a filesystem shutdown
1082 * is in progress. The caller takes the responsibility to cancel
1083 * the duplicate transaction that gets returned.
1084 */
1085 error = __xfs_trans_commit(trans, true);
1086 if (error)
1087 return error;
1088
1089 /*
1090 * Reserve space in the log for the next transaction.
1091 * This also pushes items in the "AIL", the list of logged items,
1092 * out to disk if they are taking up space at the tail of the log
1093 * that we want to use. This requires that either nothing be locked
1094 * across this call, or that anything that is locked be logged in
1095 * the prior and the next transactions.
1096 */
1097 tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
1098 return xfs_trans_reserve(*tpp, &tres, 0, 0);
1099}
1/*
2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * Copyright (C) 2010 Red Hat, Inc.
4 * All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it would be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19#include "xfs.h"
20#include "xfs_fs.h"
21#include "xfs_shared.h"
22#include "xfs_format.h"
23#include "xfs_log_format.h"
24#include "xfs_trans_resv.h"
25#include "xfs_sb.h"
26#include "xfs_ag.h"
27#include "xfs_mount.h"
28#include "xfs_inode.h"
29#include "xfs_extent_busy.h"
30#include "xfs_quota.h"
31#include "xfs_trans.h"
32#include "xfs_trans_priv.h"
33#include "xfs_log.h"
34#include "xfs_trace.h"
35#include "xfs_error.h"
36
37kmem_zone_t *xfs_trans_zone;
38kmem_zone_t *xfs_log_item_desc_zone;
39
40/*
41 * Initialize the precomputed transaction reservation values
42 * in the mount structure.
43 */
44void
45xfs_trans_init(
46 struct xfs_mount *mp)
47{
48 xfs_trans_resv_calc(mp, M_RES(mp));
49}
50
51/*
52 * This routine is called to allocate a transaction structure.
53 * The type parameter indicates the type of the transaction. These
54 * are enumerated in xfs_trans.h.
55 *
56 * Dynamically allocate the transaction structure from the transaction
57 * zone, initialize it, and return it to the caller.
58 */
59xfs_trans_t *
60xfs_trans_alloc(
61 xfs_mount_t *mp,
62 uint type)
63{
64 xfs_trans_t *tp;
65
66 sb_start_intwrite(mp->m_super);
67 tp = _xfs_trans_alloc(mp, type, KM_SLEEP);
68 tp->t_flags |= XFS_TRANS_FREEZE_PROT;
69 return tp;
70}
71
72xfs_trans_t *
73_xfs_trans_alloc(
74 xfs_mount_t *mp,
75 uint type,
76 xfs_km_flags_t memflags)
77{
78 xfs_trans_t *tp;
79
80 WARN_ON(mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
81 atomic_inc(&mp->m_active_trans);
82
83 tp = kmem_zone_zalloc(xfs_trans_zone, memflags);
84 tp->t_magic = XFS_TRANS_HEADER_MAGIC;
85 tp->t_type = type;
86 tp->t_mountp = mp;
87 INIT_LIST_HEAD(&tp->t_items);
88 INIT_LIST_HEAD(&tp->t_busy);
89 return tp;
90}
91
92/*
93 * Free the transaction structure. If there is more clean up
94 * to do when the structure is freed, add it here.
95 */
96STATIC void
97xfs_trans_free(
98 struct xfs_trans *tp)
99{
100 xfs_extent_busy_sort(&tp->t_busy);
101 xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false);
102
103 atomic_dec(&tp->t_mountp->m_active_trans);
104 if (tp->t_flags & XFS_TRANS_FREEZE_PROT)
105 sb_end_intwrite(tp->t_mountp->m_super);
106 xfs_trans_free_dqinfo(tp);
107 kmem_zone_free(xfs_trans_zone, tp);
108}
109
110/*
111 * This is called to create a new transaction which will share the
112 * permanent log reservation of the given transaction. The remaining
113 * unused block and rt extent reservations are also inherited. This
114 * implies that the original transaction is no longer allowed to allocate
115 * blocks. Locks and log items, however, are no inherited. They must
116 * be added to the new transaction explicitly.
117 */
118xfs_trans_t *
119xfs_trans_dup(
120 xfs_trans_t *tp)
121{
122 xfs_trans_t *ntp;
123
124 ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
125
126 /*
127 * Initialize the new transaction structure.
128 */
129 ntp->t_magic = XFS_TRANS_HEADER_MAGIC;
130 ntp->t_type = tp->t_type;
131 ntp->t_mountp = tp->t_mountp;
132 INIT_LIST_HEAD(&ntp->t_items);
133 INIT_LIST_HEAD(&ntp->t_busy);
134
135 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
136 ASSERT(tp->t_ticket != NULL);
137
138 ntp->t_flags = XFS_TRANS_PERM_LOG_RES |
139 (tp->t_flags & XFS_TRANS_RESERVE) |
140 (tp->t_flags & XFS_TRANS_FREEZE_PROT);
141 /* We gave our writer reference to the new transaction */
142 tp->t_flags &= ~XFS_TRANS_FREEZE_PROT;
143 ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
144 ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
145 tp->t_blk_res = tp->t_blk_res_used;
146 ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
147 tp->t_rtx_res = tp->t_rtx_res_used;
148 ntp->t_pflags = tp->t_pflags;
149
150 xfs_trans_dup_dqinfo(tp, ntp);
151
152 atomic_inc(&tp->t_mountp->m_active_trans);
153 return ntp;
154}
155
156/*
157 * This is called to reserve free disk blocks and log space for the
158 * given transaction. This must be done before allocating any resources
159 * within the transaction.
160 *
161 * This will return ENOSPC if there are not enough blocks available.
162 * It will sleep waiting for available log space.
163 * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
164 * is used by long running transactions. If any one of the reservations
165 * fails then they will all be backed out.
166 *
167 * This does not do quota reservations. That typically is done by the
168 * caller afterwards.
169 */
170int
171xfs_trans_reserve(
172 struct xfs_trans *tp,
173 struct xfs_trans_res *resp,
174 uint blocks,
175 uint rtextents)
176{
177 int error = 0;
178 int rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
179
180 /* Mark this thread as being in a transaction */
181 current_set_flags_nested(&tp->t_pflags, PF_FSTRANS);
182
183 /*
184 * Attempt to reserve the needed disk blocks by decrementing
185 * the number needed from the number available. This will
186 * fail if the count would go below zero.
187 */
188 if (blocks > 0) {
189 error = xfs_icsb_modify_counters(tp->t_mountp, XFS_SBS_FDBLOCKS,
190 -((int64_t)blocks), rsvd);
191 if (error != 0) {
192 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
193 return (XFS_ERROR(ENOSPC));
194 }
195 tp->t_blk_res += blocks;
196 }
197
198 /*
199 * Reserve the log space needed for this transaction.
200 */
201 if (resp->tr_logres > 0) {
202 bool permanent = false;
203
204 ASSERT(tp->t_log_res == 0 ||
205 tp->t_log_res == resp->tr_logres);
206 ASSERT(tp->t_log_count == 0 ||
207 tp->t_log_count == resp->tr_logcount);
208
209 if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
210 tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
211 permanent = true;
212 } else {
213 ASSERT(tp->t_ticket == NULL);
214 ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
215 }
216
217 if (tp->t_ticket != NULL) {
218 ASSERT(resp->tr_logflags & XFS_TRANS_PERM_LOG_RES);
219 error = xfs_log_regrant(tp->t_mountp, tp->t_ticket);
220 } else {
221 error = xfs_log_reserve(tp->t_mountp,
222 resp->tr_logres,
223 resp->tr_logcount,
224 &tp->t_ticket, XFS_TRANSACTION,
225 permanent, tp->t_type);
226 }
227
228 if (error)
229 goto undo_blocks;
230
231 tp->t_log_res = resp->tr_logres;
232 tp->t_log_count = resp->tr_logcount;
233 }
234
235 /*
236 * Attempt to reserve the needed realtime extents by decrementing
237 * the number needed from the number available. This will
238 * fail if the count would go below zero.
239 */
240 if (rtextents > 0) {
241 error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FREXTENTS,
242 -((int64_t)rtextents), rsvd);
243 if (error) {
244 error = XFS_ERROR(ENOSPC);
245 goto undo_log;
246 }
247 tp->t_rtx_res += rtextents;
248 }
249
250 return 0;
251
252 /*
253 * Error cases jump to one of these labels to undo any
254 * reservations which have already been performed.
255 */
256undo_log:
257 if (resp->tr_logres > 0) {
258 int log_flags;
259
260 if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
261 log_flags = XFS_LOG_REL_PERM_RESERV;
262 } else {
263 log_flags = 0;
264 }
265 xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, log_flags);
266 tp->t_ticket = NULL;
267 tp->t_log_res = 0;
268 tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
269 }
270
271undo_blocks:
272 if (blocks > 0) {
273 xfs_icsb_modify_counters(tp->t_mountp, XFS_SBS_FDBLOCKS,
274 (int64_t)blocks, rsvd);
275 tp->t_blk_res = 0;
276 }
277
278 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
279
280 return error;
281}
282
283/*
284 * Record the indicated change to the given field for application
285 * to the file system's superblock when the transaction commits.
286 * For now, just store the change in the transaction structure.
287 *
288 * Mark the transaction structure to indicate that the superblock
289 * needs to be updated before committing.
290 *
291 * Because we may not be keeping track of allocated/free inodes and
292 * used filesystem blocks in the superblock, we do not mark the
293 * superblock dirty in this transaction if we modify these fields.
294 * We still need to update the transaction deltas so that they get
295 * applied to the incore superblock, but we don't want them to
296 * cause the superblock to get locked and logged if these are the
297 * only fields in the superblock that the transaction modifies.
298 */
299void
300xfs_trans_mod_sb(
301 xfs_trans_t *tp,
302 uint field,
303 int64_t delta)
304{
305 uint32_t flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
306 xfs_mount_t *mp = tp->t_mountp;
307
308 switch (field) {
309 case XFS_TRANS_SB_ICOUNT:
310 tp->t_icount_delta += delta;
311 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
312 flags &= ~XFS_TRANS_SB_DIRTY;
313 break;
314 case XFS_TRANS_SB_IFREE:
315 tp->t_ifree_delta += delta;
316 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
317 flags &= ~XFS_TRANS_SB_DIRTY;
318 break;
319 case XFS_TRANS_SB_FDBLOCKS:
320 /*
321 * Track the number of blocks allocated in the
322 * transaction. Make sure it does not exceed the
323 * number reserved.
324 */
325 if (delta < 0) {
326 tp->t_blk_res_used += (uint)-delta;
327 ASSERT(tp->t_blk_res_used <= tp->t_blk_res);
328 }
329 tp->t_fdblocks_delta += delta;
330 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
331 flags &= ~XFS_TRANS_SB_DIRTY;
332 break;
333 case XFS_TRANS_SB_RES_FDBLOCKS:
334 /*
335 * The allocation has already been applied to the
336 * in-core superblock's counter. This should only
337 * be applied to the on-disk superblock.
338 */
339 ASSERT(delta < 0);
340 tp->t_res_fdblocks_delta += delta;
341 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
342 flags &= ~XFS_TRANS_SB_DIRTY;
343 break;
344 case XFS_TRANS_SB_FREXTENTS:
345 /*
346 * Track the number of blocks allocated in the
347 * transaction. Make sure it does not exceed the
348 * number reserved.
349 */
350 if (delta < 0) {
351 tp->t_rtx_res_used += (uint)-delta;
352 ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
353 }
354 tp->t_frextents_delta += delta;
355 break;
356 case XFS_TRANS_SB_RES_FREXTENTS:
357 /*
358 * The allocation has already been applied to the
359 * in-core superblock's counter. This should only
360 * be applied to the on-disk superblock.
361 */
362 ASSERT(delta < 0);
363 tp->t_res_frextents_delta += delta;
364 break;
365 case XFS_TRANS_SB_DBLOCKS:
366 ASSERT(delta > 0);
367 tp->t_dblocks_delta += delta;
368 break;
369 case XFS_TRANS_SB_AGCOUNT:
370 ASSERT(delta > 0);
371 tp->t_agcount_delta += delta;
372 break;
373 case XFS_TRANS_SB_IMAXPCT:
374 tp->t_imaxpct_delta += delta;
375 break;
376 case XFS_TRANS_SB_REXTSIZE:
377 tp->t_rextsize_delta += delta;
378 break;
379 case XFS_TRANS_SB_RBMBLOCKS:
380 tp->t_rbmblocks_delta += delta;
381 break;
382 case XFS_TRANS_SB_RBLOCKS:
383 tp->t_rblocks_delta += delta;
384 break;
385 case XFS_TRANS_SB_REXTENTS:
386 tp->t_rextents_delta += delta;
387 break;
388 case XFS_TRANS_SB_REXTSLOG:
389 tp->t_rextslog_delta += delta;
390 break;
391 default:
392 ASSERT(0);
393 return;
394 }
395
396 tp->t_flags |= flags;
397}
398
399/*
400 * xfs_trans_apply_sb_deltas() is called from the commit code
401 * to bring the superblock buffer into the current transaction
402 * and modify it as requested by earlier calls to xfs_trans_mod_sb().
403 *
404 * For now we just look at each field allowed to change and change
405 * it if necessary.
406 */
407STATIC void
408xfs_trans_apply_sb_deltas(
409 xfs_trans_t *tp)
410{
411 xfs_dsb_t *sbp;
412 xfs_buf_t *bp;
413 int whole = 0;
414
415 bp = xfs_trans_getsb(tp, tp->t_mountp, 0);
416 sbp = XFS_BUF_TO_SBP(bp);
417
418 /*
419 * Check that superblock mods match the mods made to AGF counters.
420 */
421 ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
422 (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
423 tp->t_ag_btree_delta));
424
425 /*
426 * Only update the superblock counters if we are logging them
427 */
428 if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
429 if (tp->t_icount_delta)
430 be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
431 if (tp->t_ifree_delta)
432 be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
433 if (tp->t_fdblocks_delta)
434 be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
435 if (tp->t_res_fdblocks_delta)
436 be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
437 }
438
439 if (tp->t_frextents_delta)
440 be64_add_cpu(&sbp->sb_frextents, tp->t_frextents_delta);
441 if (tp->t_res_frextents_delta)
442 be64_add_cpu(&sbp->sb_frextents, tp->t_res_frextents_delta);
443
444 if (tp->t_dblocks_delta) {
445 be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
446 whole = 1;
447 }
448 if (tp->t_agcount_delta) {
449 be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
450 whole = 1;
451 }
452 if (tp->t_imaxpct_delta) {
453 sbp->sb_imax_pct += tp->t_imaxpct_delta;
454 whole = 1;
455 }
456 if (tp->t_rextsize_delta) {
457 be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
458 whole = 1;
459 }
460 if (tp->t_rbmblocks_delta) {
461 be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
462 whole = 1;
463 }
464 if (tp->t_rblocks_delta) {
465 be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
466 whole = 1;
467 }
468 if (tp->t_rextents_delta) {
469 be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
470 whole = 1;
471 }
472 if (tp->t_rextslog_delta) {
473 sbp->sb_rextslog += tp->t_rextslog_delta;
474 whole = 1;
475 }
476
477 if (whole)
478 /*
479 * Log the whole thing, the fields are noncontiguous.
480 */
481 xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
482 else
483 /*
484 * Since all the modifiable fields are contiguous, we
485 * can get away with this.
486 */
487 xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
488 offsetof(xfs_dsb_t, sb_frextents) +
489 sizeof(sbp->sb_frextents) - 1);
490}
491
492/*
493 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations
494 * and apply superblock counter changes to the in-core superblock. The
495 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
496 * applied to the in-core superblock. The idea is that that has already been
497 * done.
498 *
499 * This is done efficiently with a single call to xfs_mod_incore_sb_batch().
500 * However, we have to ensure that we only modify each superblock field only
501 * once because the application of the delta values may not be atomic. That can
502 * lead to ENOSPC races occurring if we have two separate modifcations of the
503 * free space counter to put back the entire reservation and then take away
504 * what we used.
505 *
506 * If we are not logging superblock counters, then the inode allocated/free and
507 * used block counts are not updated in the on disk superblock. In this case,
508 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
509 * still need to update the incore superblock with the changes.
510 */
511void
512xfs_trans_unreserve_and_mod_sb(
513 xfs_trans_t *tp)
514{
515 xfs_mod_sb_t msb[9]; /* If you add cases, add entries */
516 xfs_mod_sb_t *msbp;
517 xfs_mount_t *mp = tp->t_mountp;
518 /* REFERENCED */
519 int error;
520 int rsvd;
521 int64_t blkdelta = 0;
522 int64_t rtxdelta = 0;
523 int64_t idelta = 0;
524 int64_t ifreedelta = 0;
525
526 msbp = msb;
527 rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
528
529 /* calculate deltas */
530 if (tp->t_blk_res > 0)
531 blkdelta = tp->t_blk_res;
532 if ((tp->t_fdblocks_delta != 0) &&
533 (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
534 (tp->t_flags & XFS_TRANS_SB_DIRTY)))
535 blkdelta += tp->t_fdblocks_delta;
536
537 if (tp->t_rtx_res > 0)
538 rtxdelta = tp->t_rtx_res;
539 if ((tp->t_frextents_delta != 0) &&
540 (tp->t_flags & XFS_TRANS_SB_DIRTY))
541 rtxdelta += tp->t_frextents_delta;
542
543 if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
544 (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
545 idelta = tp->t_icount_delta;
546 ifreedelta = tp->t_ifree_delta;
547 }
548
549 /* apply the per-cpu counters */
550 if (blkdelta) {
551 error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
552 blkdelta, rsvd);
553 if (error)
554 goto out;
555 }
556
557 if (idelta) {
558 error = xfs_icsb_modify_counters(mp, XFS_SBS_ICOUNT,
559 idelta, rsvd);
560 if (error)
561 goto out_undo_fdblocks;
562 }
563
564 if (ifreedelta) {
565 error = xfs_icsb_modify_counters(mp, XFS_SBS_IFREE,
566 ifreedelta, rsvd);
567 if (error)
568 goto out_undo_icount;
569 }
570
571 /* apply remaining deltas */
572 if (rtxdelta != 0) {
573 msbp->msb_field = XFS_SBS_FREXTENTS;
574 msbp->msb_delta = rtxdelta;
575 msbp++;
576 }
577
578 if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
579 if (tp->t_dblocks_delta != 0) {
580 msbp->msb_field = XFS_SBS_DBLOCKS;
581 msbp->msb_delta = tp->t_dblocks_delta;
582 msbp++;
583 }
584 if (tp->t_agcount_delta != 0) {
585 msbp->msb_field = XFS_SBS_AGCOUNT;
586 msbp->msb_delta = tp->t_agcount_delta;
587 msbp++;
588 }
589 if (tp->t_imaxpct_delta != 0) {
590 msbp->msb_field = XFS_SBS_IMAX_PCT;
591 msbp->msb_delta = tp->t_imaxpct_delta;
592 msbp++;
593 }
594 if (tp->t_rextsize_delta != 0) {
595 msbp->msb_field = XFS_SBS_REXTSIZE;
596 msbp->msb_delta = tp->t_rextsize_delta;
597 msbp++;
598 }
599 if (tp->t_rbmblocks_delta != 0) {
600 msbp->msb_field = XFS_SBS_RBMBLOCKS;
601 msbp->msb_delta = tp->t_rbmblocks_delta;
602 msbp++;
603 }
604 if (tp->t_rblocks_delta != 0) {
605 msbp->msb_field = XFS_SBS_RBLOCKS;
606 msbp->msb_delta = tp->t_rblocks_delta;
607 msbp++;
608 }
609 if (tp->t_rextents_delta != 0) {
610 msbp->msb_field = XFS_SBS_REXTENTS;
611 msbp->msb_delta = tp->t_rextents_delta;
612 msbp++;
613 }
614 if (tp->t_rextslog_delta != 0) {
615 msbp->msb_field = XFS_SBS_REXTSLOG;
616 msbp->msb_delta = tp->t_rextslog_delta;
617 msbp++;
618 }
619 }
620
621 /*
622 * If we need to change anything, do it.
623 */
624 if (msbp > msb) {
625 error = xfs_mod_incore_sb_batch(tp->t_mountp, msb,
626 (uint)(msbp - msb), rsvd);
627 if (error)
628 goto out_undo_ifreecount;
629 }
630
631 return;
632
633out_undo_ifreecount:
634 if (ifreedelta)
635 xfs_icsb_modify_counters(mp, XFS_SBS_IFREE, -ifreedelta, rsvd);
636out_undo_icount:
637 if (idelta)
638 xfs_icsb_modify_counters(mp, XFS_SBS_ICOUNT, -idelta, rsvd);
639out_undo_fdblocks:
640 if (blkdelta)
641 xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS, -blkdelta, rsvd);
642out:
643 ASSERT(error == 0);
644 return;
645}
646
647/*
648 * Add the given log item to the transaction's list of log items.
649 *
650 * The log item will now point to its new descriptor with its li_desc field.
651 */
652void
653xfs_trans_add_item(
654 struct xfs_trans *tp,
655 struct xfs_log_item *lip)
656{
657 struct xfs_log_item_desc *lidp;
658
659 ASSERT(lip->li_mountp == tp->t_mountp);
660 ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
661
662 lidp = kmem_zone_zalloc(xfs_log_item_desc_zone, KM_SLEEP | KM_NOFS);
663
664 lidp->lid_item = lip;
665 lidp->lid_flags = 0;
666 list_add_tail(&lidp->lid_trans, &tp->t_items);
667
668 lip->li_desc = lidp;
669}
670
671STATIC void
672xfs_trans_free_item_desc(
673 struct xfs_log_item_desc *lidp)
674{
675 list_del_init(&lidp->lid_trans);
676 kmem_zone_free(xfs_log_item_desc_zone, lidp);
677}
678
679/*
680 * Unlink and free the given descriptor.
681 */
682void
683xfs_trans_del_item(
684 struct xfs_log_item *lip)
685{
686 xfs_trans_free_item_desc(lip->li_desc);
687 lip->li_desc = NULL;
688}
689
690/*
691 * Unlock all of the items of a transaction and free all the descriptors
692 * of that transaction.
693 */
694void
695xfs_trans_free_items(
696 struct xfs_trans *tp,
697 xfs_lsn_t commit_lsn,
698 int flags)
699{
700 struct xfs_log_item_desc *lidp, *next;
701
702 list_for_each_entry_safe(lidp, next, &tp->t_items, lid_trans) {
703 struct xfs_log_item *lip = lidp->lid_item;
704
705 lip->li_desc = NULL;
706
707 if (commit_lsn != NULLCOMMITLSN)
708 lip->li_ops->iop_committing(lip, commit_lsn);
709 if (flags & XFS_TRANS_ABORT)
710 lip->li_flags |= XFS_LI_ABORTED;
711 lip->li_ops->iop_unlock(lip);
712
713 xfs_trans_free_item_desc(lidp);
714 }
715}
716
717static inline void
718xfs_log_item_batch_insert(
719 struct xfs_ail *ailp,
720 struct xfs_ail_cursor *cur,
721 struct xfs_log_item **log_items,
722 int nr_items,
723 xfs_lsn_t commit_lsn)
724{
725 int i;
726
727 spin_lock(&ailp->xa_lock);
728 /* xfs_trans_ail_update_bulk drops ailp->xa_lock */
729 xfs_trans_ail_update_bulk(ailp, cur, log_items, nr_items, commit_lsn);
730
731 for (i = 0; i < nr_items; i++) {
732 struct xfs_log_item *lip = log_items[i];
733
734 lip->li_ops->iop_unpin(lip, 0);
735 }
736}
737
738/*
739 * Bulk operation version of xfs_trans_committed that takes a log vector of
740 * items to insert into the AIL. This uses bulk AIL insertion techniques to
741 * minimise lock traffic.
742 *
743 * If we are called with the aborted flag set, it is because a log write during
744 * a CIL checkpoint commit has failed. In this case, all the items in the
745 * checkpoint have already gone through iop_commited and iop_unlock, which
746 * means that checkpoint commit abort handling is treated exactly the same
747 * as an iclog write error even though we haven't started any IO yet. Hence in
748 * this case all we need to do is iop_committed processing, followed by an
749 * iop_unpin(aborted) call.
750 *
751 * The AIL cursor is used to optimise the insert process. If commit_lsn is not
752 * at the end of the AIL, the insert cursor avoids the need to walk
753 * the AIL to find the insertion point on every xfs_log_item_batch_insert()
754 * call. This saves a lot of needless list walking and is a net win, even
755 * though it slightly increases that amount of AIL lock traffic to set it up
756 * and tear it down.
757 */
758void
759xfs_trans_committed_bulk(
760 struct xfs_ail *ailp,
761 struct xfs_log_vec *log_vector,
762 xfs_lsn_t commit_lsn,
763 int aborted)
764{
765#define LOG_ITEM_BATCH_SIZE 32
766 struct xfs_log_item *log_items[LOG_ITEM_BATCH_SIZE];
767 struct xfs_log_vec *lv;
768 struct xfs_ail_cursor cur;
769 int i = 0;
770
771 spin_lock(&ailp->xa_lock);
772 xfs_trans_ail_cursor_last(ailp, &cur, commit_lsn);
773 spin_unlock(&ailp->xa_lock);
774
775 /* unpin all the log items */
776 for (lv = log_vector; lv; lv = lv->lv_next ) {
777 struct xfs_log_item *lip = lv->lv_item;
778 xfs_lsn_t item_lsn;
779
780 if (aborted)
781 lip->li_flags |= XFS_LI_ABORTED;
782 item_lsn = lip->li_ops->iop_committed(lip, commit_lsn);
783
784 /* item_lsn of -1 means the item needs no further processing */
785 if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
786 continue;
787
788 /*
789 * if we are aborting the operation, no point in inserting the
790 * object into the AIL as we are in a shutdown situation.
791 */
792 if (aborted) {
793 ASSERT(XFS_FORCED_SHUTDOWN(ailp->xa_mount));
794 lip->li_ops->iop_unpin(lip, 1);
795 continue;
796 }
797
798 if (item_lsn != commit_lsn) {
799
800 /*
801 * Not a bulk update option due to unusual item_lsn.
802 * Push into AIL immediately, rechecking the lsn once
803 * we have the ail lock. Then unpin the item. This does
804 * not affect the AIL cursor the bulk insert path is
805 * using.
806 */
807 spin_lock(&ailp->xa_lock);
808 if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0)
809 xfs_trans_ail_update(ailp, lip, item_lsn);
810 else
811 spin_unlock(&ailp->xa_lock);
812 lip->li_ops->iop_unpin(lip, 0);
813 continue;
814 }
815
816 /* Item is a candidate for bulk AIL insert. */
817 log_items[i++] = lv->lv_item;
818 if (i >= LOG_ITEM_BATCH_SIZE) {
819 xfs_log_item_batch_insert(ailp, &cur, log_items,
820 LOG_ITEM_BATCH_SIZE, commit_lsn);
821 i = 0;
822 }
823 }
824
825 /* make sure we insert the remainder! */
826 if (i)
827 xfs_log_item_batch_insert(ailp, &cur, log_items, i, commit_lsn);
828
829 spin_lock(&ailp->xa_lock);
830 xfs_trans_ail_cursor_done(ailp, &cur);
831 spin_unlock(&ailp->xa_lock);
832}
833
834/*
835 * Commit the given transaction to the log.
836 *
837 * XFS disk error handling mechanism is not based on a typical
838 * transaction abort mechanism. Logically after the filesystem
839 * gets marked 'SHUTDOWN', we can't let any new transactions
840 * be durable - ie. committed to disk - because some metadata might
841 * be inconsistent. In such cases, this returns an error, and the
842 * caller may assume that all locked objects joined to the transaction
843 * have already been unlocked as if the commit had succeeded.
844 * Do not reference the transaction structure after this call.
845 */
846int
847xfs_trans_commit(
848 struct xfs_trans *tp,
849 uint flags)
850{
851 struct xfs_mount *mp = tp->t_mountp;
852 xfs_lsn_t commit_lsn = -1;
853 int error = 0;
854 int log_flags = 0;
855 int sync = tp->t_flags & XFS_TRANS_SYNC;
856
857 /*
858 * Determine whether this commit is releasing a permanent
859 * log reservation or not.
860 */
861 if (flags & XFS_TRANS_RELEASE_LOG_RES) {
862 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
863 log_flags = XFS_LOG_REL_PERM_RESERV;
864 }
865
866 /*
867 * If there is nothing to be logged by the transaction,
868 * then unlock all of the items associated with the
869 * transaction and free the transaction structure.
870 * Also make sure to return any reserved blocks to
871 * the free pool.
872 */
873 if (!(tp->t_flags & XFS_TRANS_DIRTY))
874 goto out_unreserve;
875
876 if (XFS_FORCED_SHUTDOWN(mp)) {
877 error = XFS_ERROR(EIO);
878 goto out_unreserve;
879 }
880
881 ASSERT(tp->t_ticket != NULL);
882
883 /*
884 * If we need to update the superblock, then do it now.
885 */
886 if (tp->t_flags & XFS_TRANS_SB_DIRTY)
887 xfs_trans_apply_sb_deltas(tp);
888 xfs_trans_apply_dquot_deltas(tp);
889
890 xfs_log_commit_cil(mp, tp, &commit_lsn, flags);
891
892 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
893 xfs_trans_free(tp);
894
895 /*
896 * If the transaction needs to be synchronous, then force the
897 * log out now and wait for it.
898 */
899 if (sync) {
900 error = _xfs_log_force_lsn(mp, commit_lsn, XFS_LOG_SYNC, NULL);
901 XFS_STATS_INC(xs_trans_sync);
902 } else {
903 XFS_STATS_INC(xs_trans_async);
904 }
905
906 return error;
907
908out_unreserve:
909 xfs_trans_unreserve_and_mod_sb(tp);
910
911 /*
912 * It is indeed possible for the transaction to be not dirty but
913 * the dqinfo portion to be. All that means is that we have some
914 * (non-persistent) quota reservations that need to be unreserved.
915 */
916 xfs_trans_unreserve_and_mod_dquots(tp);
917 if (tp->t_ticket) {
918 commit_lsn = xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
919 if (commit_lsn == -1 && !error)
920 error = XFS_ERROR(EIO);
921 }
922 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
923 xfs_trans_free_items(tp, NULLCOMMITLSN, error ? XFS_TRANS_ABORT : 0);
924 xfs_trans_free(tp);
925
926 XFS_STATS_INC(xs_trans_empty);
927 return error;
928}
929
930/*
931 * Unlock all of the transaction's items and free the transaction.
932 * The transaction must not have modified any of its items, because
933 * there is no way to restore them to their previous state.
934 *
935 * If the transaction has made a log reservation, make sure to release
936 * it as well.
937 */
938void
939xfs_trans_cancel(
940 xfs_trans_t *tp,
941 int flags)
942{
943 int log_flags;
944 xfs_mount_t *mp = tp->t_mountp;
945
946 /*
947 * See if the caller is being too lazy to figure out if
948 * the transaction really needs an abort.
949 */
950 if ((flags & XFS_TRANS_ABORT) && !(tp->t_flags & XFS_TRANS_DIRTY))
951 flags &= ~XFS_TRANS_ABORT;
952 /*
953 * See if the caller is relying on us to shut down the
954 * filesystem. This happens in paths where we detect
955 * corruption and decide to give up.
956 */
957 if ((tp->t_flags & XFS_TRANS_DIRTY) && !XFS_FORCED_SHUTDOWN(mp)) {
958 XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
959 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
960 }
961#ifdef DEBUG
962 if (!(flags & XFS_TRANS_ABORT) && !XFS_FORCED_SHUTDOWN(mp)) {
963 struct xfs_log_item_desc *lidp;
964
965 list_for_each_entry(lidp, &tp->t_items, lid_trans)
966 ASSERT(!(lidp->lid_item->li_type == XFS_LI_EFD));
967 }
968#endif
969 xfs_trans_unreserve_and_mod_sb(tp);
970 xfs_trans_unreserve_and_mod_dquots(tp);
971
972 if (tp->t_ticket) {
973 if (flags & XFS_TRANS_RELEASE_LOG_RES) {
974 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
975 log_flags = XFS_LOG_REL_PERM_RESERV;
976 } else {
977 log_flags = 0;
978 }
979 xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
980 }
981
982 /* mark this thread as no longer being in a transaction */
983 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
984
985 xfs_trans_free_items(tp, NULLCOMMITLSN, flags);
986 xfs_trans_free(tp);
987}
988
989/*
990 * Roll from one trans in the sequence of PERMANENT transactions to
991 * the next: permanent transactions are only flushed out when
992 * committed with XFS_TRANS_RELEASE_LOG_RES, but we still want as soon
993 * as possible to let chunks of it go to the log. So we commit the
994 * chunk we've been working on and get a new transaction to continue.
995 */
996int
997xfs_trans_roll(
998 struct xfs_trans **tpp,
999 struct xfs_inode *dp)
1000{
1001 struct xfs_trans *trans;
1002 struct xfs_trans_res tres;
1003 int error;
1004
1005 /*
1006 * Ensure that the inode is always logged.
1007 */
1008 trans = *tpp;
1009 xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
1010
1011 /*
1012 * Copy the critical parameters from one trans to the next.
1013 */
1014 tres.tr_logres = trans->t_log_res;
1015 tres.tr_logcount = trans->t_log_count;
1016 *tpp = xfs_trans_dup(trans);
1017
1018 /*
1019 * Commit the current transaction.
1020 * If this commit failed, then it'd just unlock those items that
1021 * are not marked ihold. That also means that a filesystem shutdown
1022 * is in progress. The caller takes the responsibility to cancel
1023 * the duplicate transaction that gets returned.
1024 */
1025 error = xfs_trans_commit(trans, 0);
1026 if (error)
1027 return (error);
1028
1029 trans = *tpp;
1030
1031 /*
1032 * transaction commit worked ok so we can drop the extra ticket
1033 * reference that we gained in xfs_trans_dup()
1034 */
1035 xfs_log_ticket_put(trans->t_ticket);
1036
1037
1038 /*
1039 * Reserve space in the log for th next transaction.
1040 * This also pushes items in the "AIL", the list of logged items,
1041 * out to disk if they are taking up space at the tail of the log
1042 * that we want to use. This requires that either nothing be locked
1043 * across this call, or that anything that is locked be logged in
1044 * the prior and the next transactions.
1045 */
1046 tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
1047 error = xfs_trans_reserve(trans, &tres, 0, 0);
1048 /*
1049 * Ensure that the inode is in the new transaction and locked.
1050 */
1051 if (error)
1052 return error;
1053
1054 xfs_trans_ijoin(trans, dp, 0);
1055 return 0;
1056}