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