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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
4 * Copyright (C) 2010 Red Hat, Inc.
5 * All Rights Reserved.
6 */
7#include "xfs.h"
8#include "xfs_fs.h"
9#include "xfs_shared.h"
10#include "xfs_format.h"
11#include "xfs_log_format.h"
12#include "xfs_log_priv.h"
13#include "xfs_trans_resv.h"
14#include "xfs_mount.h"
15#include "xfs_extent_busy.h"
16#include "xfs_quota.h"
17#include "xfs_trans.h"
18#include "xfs_trans_priv.h"
19#include "xfs_log.h"
20#include "xfs_trace.h"
21#include "xfs_error.h"
22#include "xfs_defer.h"
23#include "xfs_inode.h"
24#include "xfs_dquot_item.h"
25#include "xfs_dquot.h"
26#include "xfs_icache.h"
27
28kmem_zone_t *xfs_trans_zone;
29
30#if defined(CONFIG_TRACEPOINTS)
31static void
32xfs_trans_trace_reservations(
33 struct xfs_mount *mp)
34{
35 struct xfs_trans_res resv;
36 struct xfs_trans_res *res;
37 struct xfs_trans_res *end_res;
38 int i;
39
40 res = (struct xfs_trans_res *)M_RES(mp);
41 end_res = (struct xfs_trans_res *)(M_RES(mp) + 1);
42 for (i = 0; res < end_res; i++, res++)
43 trace_xfs_trans_resv_calc(mp, i, res);
44 xfs_log_get_max_trans_res(mp, &resv);
45 trace_xfs_trans_resv_calc(mp, -1, &resv);
46}
47#else
48# define xfs_trans_trace_reservations(mp)
49#endif
50
51/*
52 * Initialize the precomputed transaction reservation values
53 * in the mount structure.
54 */
55void
56xfs_trans_init(
57 struct xfs_mount *mp)
58{
59 xfs_trans_resv_calc(mp, M_RES(mp));
60 xfs_trans_trace_reservations(mp);
61}
62
63/*
64 * Free the transaction structure. If there is more clean up
65 * to do when the structure is freed, add it here.
66 */
67STATIC void
68xfs_trans_free(
69 struct xfs_trans *tp)
70{
71 xfs_extent_busy_sort(&tp->t_busy);
72 xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false);
73
74 trace_xfs_trans_free(tp, _RET_IP_);
75 xfs_trans_clear_context(tp);
76 if (!(tp->t_flags & XFS_TRANS_NO_WRITECOUNT))
77 sb_end_intwrite(tp->t_mountp->m_super);
78 xfs_trans_free_dqinfo(tp);
79 kmem_cache_free(xfs_trans_zone, tp);
80}
81
82/*
83 * This is called to create a new transaction which will share the
84 * permanent log reservation of the given transaction. The remaining
85 * unused block and rt extent reservations are also inherited. This
86 * implies that the original transaction is no longer allowed to allocate
87 * blocks. Locks and log items, however, are no inherited. They must
88 * be added to the new transaction explicitly.
89 */
90STATIC struct xfs_trans *
91xfs_trans_dup(
92 struct xfs_trans *tp)
93{
94 struct xfs_trans *ntp;
95
96 trace_xfs_trans_dup(tp, _RET_IP_);
97
98 ntp = kmem_cache_zalloc(xfs_trans_zone, GFP_KERNEL | __GFP_NOFAIL);
99
100 /*
101 * Initialize the new transaction structure.
102 */
103 ntp->t_magic = XFS_TRANS_HEADER_MAGIC;
104 ntp->t_mountp = tp->t_mountp;
105 INIT_LIST_HEAD(&ntp->t_items);
106 INIT_LIST_HEAD(&ntp->t_busy);
107 INIT_LIST_HEAD(&ntp->t_dfops);
108 ntp->t_firstblock = NULLFSBLOCK;
109
110 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
111 ASSERT(tp->t_ticket != NULL);
112
113 ntp->t_flags = XFS_TRANS_PERM_LOG_RES |
114 (tp->t_flags & XFS_TRANS_RESERVE) |
115 (tp->t_flags & XFS_TRANS_NO_WRITECOUNT) |
116 (tp->t_flags & XFS_TRANS_RES_FDBLKS);
117 /* We gave our writer reference to the new transaction */
118 tp->t_flags |= XFS_TRANS_NO_WRITECOUNT;
119 ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
120
121 ASSERT(tp->t_blk_res >= tp->t_blk_res_used);
122 ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
123 tp->t_blk_res = tp->t_blk_res_used;
124
125 ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
126 tp->t_rtx_res = tp->t_rtx_res_used;
127
128 xfs_trans_switch_context(tp, ntp);
129
130 /* move deferred ops over to the new tp */
131 xfs_defer_move(ntp, tp);
132
133 xfs_trans_dup_dqinfo(tp, ntp);
134 return ntp;
135}
136
137/*
138 * This is called to reserve free disk blocks and log space for the
139 * given transaction. This must be done before allocating any resources
140 * within the transaction.
141 *
142 * This will return ENOSPC if there are not enough blocks available.
143 * It will sleep waiting for available log space.
144 * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
145 * is used by long running transactions. If any one of the reservations
146 * fails then they will all be backed out.
147 *
148 * This does not do quota reservations. That typically is done by the
149 * caller afterwards.
150 */
151static int
152xfs_trans_reserve(
153 struct xfs_trans *tp,
154 struct xfs_trans_res *resp,
155 uint blocks,
156 uint rtextents)
157{
158 struct xfs_mount *mp = tp->t_mountp;
159 int error = 0;
160 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
161
162 /*
163 * Attempt to reserve the needed disk blocks by decrementing
164 * the number needed from the number available. This will
165 * fail if the count would go below zero.
166 */
167 if (blocks > 0) {
168 error = xfs_mod_fdblocks(mp, -((int64_t)blocks), rsvd);
169 if (error != 0)
170 return -ENOSPC;
171 tp->t_blk_res += blocks;
172 }
173
174 /*
175 * Reserve the log space needed for this transaction.
176 */
177 if (resp->tr_logres > 0) {
178 bool permanent = false;
179
180 ASSERT(tp->t_log_res == 0 ||
181 tp->t_log_res == resp->tr_logres);
182 ASSERT(tp->t_log_count == 0 ||
183 tp->t_log_count == resp->tr_logcount);
184
185 if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
186 tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
187 permanent = true;
188 } else {
189 ASSERT(tp->t_ticket == NULL);
190 ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
191 }
192
193 if (tp->t_ticket != NULL) {
194 ASSERT(resp->tr_logflags & XFS_TRANS_PERM_LOG_RES);
195 error = xfs_log_regrant(mp, tp->t_ticket);
196 } else {
197 error = xfs_log_reserve(mp,
198 resp->tr_logres,
199 resp->tr_logcount,
200 &tp->t_ticket, XFS_TRANSACTION,
201 permanent);
202 }
203
204 if (error)
205 goto undo_blocks;
206
207 tp->t_log_res = resp->tr_logres;
208 tp->t_log_count = resp->tr_logcount;
209 }
210
211 /*
212 * Attempt to reserve the needed realtime extents by decrementing
213 * the number needed from the number available. This will
214 * fail if the count would go below zero.
215 */
216 if (rtextents > 0) {
217 error = xfs_mod_frextents(mp, -((int64_t)rtextents));
218 if (error) {
219 error = -ENOSPC;
220 goto undo_log;
221 }
222 tp->t_rtx_res += rtextents;
223 }
224
225 return 0;
226
227 /*
228 * Error cases jump to one of these labels to undo any
229 * reservations which have already been performed.
230 */
231undo_log:
232 if (resp->tr_logres > 0) {
233 xfs_log_ticket_ungrant(mp->m_log, tp->t_ticket);
234 tp->t_ticket = NULL;
235 tp->t_log_res = 0;
236 tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
237 }
238
239undo_blocks:
240 if (blocks > 0) {
241 xfs_mod_fdblocks(mp, (int64_t)blocks, rsvd);
242 tp->t_blk_res = 0;
243 }
244 return error;
245}
246
247int
248xfs_trans_alloc(
249 struct xfs_mount *mp,
250 struct xfs_trans_res *resp,
251 uint blocks,
252 uint rtextents,
253 uint flags,
254 struct xfs_trans **tpp)
255{
256 struct xfs_trans *tp;
257 bool want_retry = true;
258 int error;
259
260 /*
261 * Allocate the handle before we do our freeze accounting and setting up
262 * GFP_NOFS allocation context so that we avoid lockdep false positives
263 * by doing GFP_KERNEL allocations inside sb_start_intwrite().
264 */
265retry:
266 tp = kmem_cache_zalloc(xfs_trans_zone, GFP_KERNEL | __GFP_NOFAIL);
267 if (!(flags & XFS_TRANS_NO_WRITECOUNT))
268 sb_start_intwrite(mp->m_super);
269 xfs_trans_set_context(tp);
270
271 /*
272 * Zero-reservation ("empty") transactions can't modify anything, so
273 * they're allowed to run while we're frozen.
274 */
275 WARN_ON(resp->tr_logres > 0 &&
276 mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
277 ASSERT(!(flags & XFS_TRANS_RES_FDBLKS) ||
278 xfs_sb_version_haslazysbcount(&mp->m_sb));
279
280 tp->t_magic = XFS_TRANS_HEADER_MAGIC;
281 tp->t_flags = flags;
282 tp->t_mountp = mp;
283 INIT_LIST_HEAD(&tp->t_items);
284 INIT_LIST_HEAD(&tp->t_busy);
285 INIT_LIST_HEAD(&tp->t_dfops);
286 tp->t_firstblock = NULLFSBLOCK;
287
288 error = xfs_trans_reserve(tp, resp, blocks, rtextents);
289 if (error == -ENOSPC && want_retry) {
290 xfs_trans_cancel(tp);
291
292 /*
293 * We weren't able to reserve enough space for the transaction.
294 * Flush the other speculative space allocations to free space.
295 * Do not perform a synchronous scan because callers can hold
296 * other locks.
297 */
298 error = xfs_blockgc_free_space(mp, NULL);
299 if (error)
300 return error;
301
302 want_retry = false;
303 goto retry;
304 }
305 if (error) {
306 xfs_trans_cancel(tp);
307 return error;
308 }
309
310 trace_xfs_trans_alloc(tp, _RET_IP_);
311
312 *tpp = tp;
313 return 0;
314}
315
316/*
317 * Create an empty transaction with no reservation. This is a defensive
318 * mechanism for routines that query metadata without actually modifying them --
319 * if the metadata being queried is somehow cross-linked (think a btree block
320 * pointer that points higher in the tree), we risk deadlock. However, blocks
321 * grabbed as part of a transaction can be re-grabbed. The verifiers will
322 * notice the corrupt block and the operation will fail back to userspace
323 * without deadlocking.
324 *
325 * Note the zero-length reservation; this transaction MUST be cancelled without
326 * any dirty data.
327 *
328 * Callers should obtain freeze protection to avoid a conflict with fs freezing
329 * where we can be grabbing buffers at the same time that freeze is trying to
330 * drain the buffer LRU list.
331 */
332int
333xfs_trans_alloc_empty(
334 struct xfs_mount *mp,
335 struct xfs_trans **tpp)
336{
337 struct xfs_trans_res resv = {0};
338
339 return xfs_trans_alloc(mp, &resv, 0, 0, XFS_TRANS_NO_WRITECOUNT, tpp);
340}
341
342/*
343 * Record the indicated change to the given field for application
344 * to the file system's superblock when the transaction commits.
345 * For now, just store the change in the transaction structure.
346 *
347 * Mark the transaction structure to indicate that the superblock
348 * needs to be updated before committing.
349 *
350 * Because we may not be keeping track of allocated/free inodes and
351 * used filesystem blocks in the superblock, we do not mark the
352 * superblock dirty in this transaction if we modify these fields.
353 * We still need to update the transaction deltas so that they get
354 * applied to the incore superblock, but we don't want them to
355 * cause the superblock to get locked and logged if these are the
356 * only fields in the superblock that the transaction modifies.
357 */
358void
359xfs_trans_mod_sb(
360 xfs_trans_t *tp,
361 uint field,
362 int64_t delta)
363{
364 uint32_t flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
365 xfs_mount_t *mp = tp->t_mountp;
366
367 switch (field) {
368 case XFS_TRANS_SB_ICOUNT:
369 tp->t_icount_delta += delta;
370 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
371 flags &= ~XFS_TRANS_SB_DIRTY;
372 break;
373 case XFS_TRANS_SB_IFREE:
374 tp->t_ifree_delta += delta;
375 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
376 flags &= ~XFS_TRANS_SB_DIRTY;
377 break;
378 case XFS_TRANS_SB_FDBLOCKS:
379 /*
380 * Track the number of blocks allocated in the transaction.
381 * Make sure it does not exceed the number reserved. If so,
382 * shutdown as this can lead to accounting inconsistency.
383 */
384 if (delta < 0) {
385 tp->t_blk_res_used += (uint)-delta;
386 if (tp->t_blk_res_used > tp->t_blk_res)
387 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
388 } else if (delta > 0 && (tp->t_flags & XFS_TRANS_RES_FDBLKS)) {
389 int64_t blkres_delta;
390
391 /*
392 * Return freed blocks directly to the reservation
393 * instead of the global pool, being careful not to
394 * overflow the trans counter. This is used to preserve
395 * reservation across chains of transaction rolls that
396 * repeatedly free and allocate blocks.
397 */
398 blkres_delta = min_t(int64_t, delta,
399 UINT_MAX - tp->t_blk_res);
400 tp->t_blk_res += blkres_delta;
401 delta -= blkres_delta;
402 }
403 tp->t_fdblocks_delta += delta;
404 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
405 flags &= ~XFS_TRANS_SB_DIRTY;
406 break;
407 case XFS_TRANS_SB_RES_FDBLOCKS:
408 /*
409 * The allocation has already been applied to the
410 * in-core superblock's counter. This should only
411 * be applied to the on-disk superblock.
412 */
413 tp->t_res_fdblocks_delta += delta;
414 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
415 flags &= ~XFS_TRANS_SB_DIRTY;
416 break;
417 case XFS_TRANS_SB_FREXTENTS:
418 /*
419 * Track the number of blocks allocated in the
420 * transaction. Make sure it does not exceed the
421 * number reserved.
422 */
423 if (delta < 0) {
424 tp->t_rtx_res_used += (uint)-delta;
425 ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
426 }
427 tp->t_frextents_delta += delta;
428 break;
429 case XFS_TRANS_SB_RES_FREXTENTS:
430 /*
431 * The allocation has already been applied to the
432 * in-core superblock's counter. This should only
433 * be applied to the on-disk superblock.
434 */
435 ASSERT(delta < 0);
436 tp->t_res_frextents_delta += delta;
437 break;
438 case XFS_TRANS_SB_DBLOCKS:
439 tp->t_dblocks_delta += delta;
440 break;
441 case XFS_TRANS_SB_AGCOUNT:
442 ASSERT(delta > 0);
443 tp->t_agcount_delta += delta;
444 break;
445 case XFS_TRANS_SB_IMAXPCT:
446 tp->t_imaxpct_delta += delta;
447 break;
448 case XFS_TRANS_SB_REXTSIZE:
449 tp->t_rextsize_delta += delta;
450 break;
451 case XFS_TRANS_SB_RBMBLOCKS:
452 tp->t_rbmblocks_delta += delta;
453 break;
454 case XFS_TRANS_SB_RBLOCKS:
455 tp->t_rblocks_delta += delta;
456 break;
457 case XFS_TRANS_SB_REXTENTS:
458 tp->t_rextents_delta += delta;
459 break;
460 case XFS_TRANS_SB_REXTSLOG:
461 tp->t_rextslog_delta += delta;
462 break;
463 default:
464 ASSERT(0);
465 return;
466 }
467
468 tp->t_flags |= flags;
469}
470
471/*
472 * xfs_trans_apply_sb_deltas() is called from the commit code
473 * to bring the superblock buffer into the current transaction
474 * and modify it as requested by earlier calls to xfs_trans_mod_sb().
475 *
476 * For now we just look at each field allowed to change and change
477 * it if necessary.
478 */
479STATIC void
480xfs_trans_apply_sb_deltas(
481 xfs_trans_t *tp)
482{
483 xfs_dsb_t *sbp;
484 struct xfs_buf *bp;
485 int whole = 0;
486
487 bp = xfs_trans_getsb(tp);
488 sbp = bp->b_addr;
489
490 /*
491 * Only update the superblock counters if we are logging them
492 */
493 if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
494 if (tp->t_icount_delta)
495 be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
496 if (tp->t_ifree_delta)
497 be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
498 if (tp->t_fdblocks_delta)
499 be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
500 if (tp->t_res_fdblocks_delta)
501 be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
502 }
503
504 if (tp->t_frextents_delta)
505 be64_add_cpu(&sbp->sb_frextents, tp->t_frextents_delta);
506 if (tp->t_res_frextents_delta)
507 be64_add_cpu(&sbp->sb_frextents, tp->t_res_frextents_delta);
508
509 if (tp->t_dblocks_delta) {
510 be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
511 whole = 1;
512 }
513 if (tp->t_agcount_delta) {
514 be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
515 whole = 1;
516 }
517 if (tp->t_imaxpct_delta) {
518 sbp->sb_imax_pct += tp->t_imaxpct_delta;
519 whole = 1;
520 }
521 if (tp->t_rextsize_delta) {
522 be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
523 whole = 1;
524 }
525 if (tp->t_rbmblocks_delta) {
526 be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
527 whole = 1;
528 }
529 if (tp->t_rblocks_delta) {
530 be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
531 whole = 1;
532 }
533 if (tp->t_rextents_delta) {
534 be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
535 whole = 1;
536 }
537 if (tp->t_rextslog_delta) {
538 sbp->sb_rextslog += tp->t_rextslog_delta;
539 whole = 1;
540 }
541
542 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
543 if (whole)
544 /*
545 * Log the whole thing, the fields are noncontiguous.
546 */
547 xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
548 else
549 /*
550 * Since all the modifiable fields are contiguous, we
551 * can get away with this.
552 */
553 xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
554 offsetof(xfs_dsb_t, sb_frextents) +
555 sizeof(sbp->sb_frextents) - 1);
556}
557
558/*
559 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations and
560 * apply superblock counter changes to the in-core superblock. The
561 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
562 * applied to the in-core superblock. The idea is that that has already been
563 * done.
564 *
565 * If we are not logging superblock counters, then the inode allocated/free and
566 * used block counts are not updated in the on disk superblock. In this case,
567 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
568 * still need to update the incore superblock with the changes.
569 *
570 * Deltas for the inode count are +/-64, hence we use a large batch size of 128
571 * so we don't need to take the counter lock on every update.
572 */
573#define XFS_ICOUNT_BATCH 128
574
575void
576xfs_trans_unreserve_and_mod_sb(
577 struct xfs_trans *tp)
578{
579 struct xfs_mount *mp = tp->t_mountp;
580 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
581 int64_t blkdelta = 0;
582 int64_t rtxdelta = 0;
583 int64_t idelta = 0;
584 int64_t ifreedelta = 0;
585 int error;
586
587 /* calculate deltas */
588 if (tp->t_blk_res > 0)
589 blkdelta = tp->t_blk_res;
590 if ((tp->t_fdblocks_delta != 0) &&
591 (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
592 (tp->t_flags & XFS_TRANS_SB_DIRTY)))
593 blkdelta += tp->t_fdblocks_delta;
594
595 if (tp->t_rtx_res > 0)
596 rtxdelta = tp->t_rtx_res;
597 if ((tp->t_frextents_delta != 0) &&
598 (tp->t_flags & XFS_TRANS_SB_DIRTY))
599 rtxdelta += tp->t_frextents_delta;
600
601 if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
602 (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
603 idelta = tp->t_icount_delta;
604 ifreedelta = tp->t_ifree_delta;
605 }
606
607 /* apply the per-cpu counters */
608 if (blkdelta) {
609 error = xfs_mod_fdblocks(mp, blkdelta, rsvd);
610 ASSERT(!error);
611 }
612
613 if (idelta)
614 percpu_counter_add_batch(&mp->m_icount, idelta,
615 XFS_ICOUNT_BATCH);
616
617 if (ifreedelta)
618 percpu_counter_add(&mp->m_ifree, ifreedelta);
619
620 if (rtxdelta == 0 && !(tp->t_flags & XFS_TRANS_SB_DIRTY))
621 return;
622
623 /* apply remaining deltas */
624 spin_lock(&mp->m_sb_lock);
625 mp->m_sb.sb_fdblocks += tp->t_fdblocks_delta + tp->t_res_fdblocks_delta;
626 mp->m_sb.sb_icount += idelta;
627 mp->m_sb.sb_ifree += ifreedelta;
628 mp->m_sb.sb_frextents += rtxdelta;
629 mp->m_sb.sb_dblocks += tp->t_dblocks_delta;
630 mp->m_sb.sb_agcount += tp->t_agcount_delta;
631 mp->m_sb.sb_imax_pct += tp->t_imaxpct_delta;
632 mp->m_sb.sb_rextsize += tp->t_rextsize_delta;
633 mp->m_sb.sb_rbmblocks += tp->t_rbmblocks_delta;
634 mp->m_sb.sb_rblocks += tp->t_rblocks_delta;
635 mp->m_sb.sb_rextents += tp->t_rextents_delta;
636 mp->m_sb.sb_rextslog += tp->t_rextslog_delta;
637 spin_unlock(&mp->m_sb_lock);
638
639 /*
640 * Debug checks outside of the spinlock so they don't lock up the
641 * machine if they fail.
642 */
643 ASSERT(mp->m_sb.sb_imax_pct >= 0);
644 ASSERT(mp->m_sb.sb_rextslog >= 0);
645 return;
646}
647
648/* Add the given log item to the transaction's list of log items. */
649void
650xfs_trans_add_item(
651 struct xfs_trans *tp,
652 struct xfs_log_item *lip)
653{
654 ASSERT(lip->li_mountp == tp->t_mountp);
655 ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
656 ASSERT(list_empty(&lip->li_trans));
657 ASSERT(!test_bit(XFS_LI_DIRTY, &lip->li_flags));
658
659 list_add_tail(&lip->li_trans, &tp->t_items);
660 trace_xfs_trans_add_item(tp, _RET_IP_);
661}
662
663/*
664 * Unlink the log item from the transaction. the log item is no longer
665 * considered dirty in this transaction, as the linked transaction has
666 * finished, either by abort or commit completion.
667 */
668void
669xfs_trans_del_item(
670 struct xfs_log_item *lip)
671{
672 clear_bit(XFS_LI_DIRTY, &lip->li_flags);
673 list_del_init(&lip->li_trans);
674}
675
676/* Detach and unlock all of the items in a transaction */
677static void
678xfs_trans_free_items(
679 struct xfs_trans *tp,
680 bool abort)
681{
682 struct xfs_log_item *lip, *next;
683
684 trace_xfs_trans_free_items(tp, _RET_IP_);
685
686 list_for_each_entry_safe(lip, next, &tp->t_items, li_trans) {
687 xfs_trans_del_item(lip);
688 if (abort)
689 set_bit(XFS_LI_ABORTED, &lip->li_flags);
690 if (lip->li_ops->iop_release)
691 lip->li_ops->iop_release(lip);
692 }
693}
694
695static inline void
696xfs_log_item_batch_insert(
697 struct xfs_ail *ailp,
698 struct xfs_ail_cursor *cur,
699 struct xfs_log_item **log_items,
700 int nr_items,
701 xfs_lsn_t commit_lsn)
702{
703 int i;
704
705 spin_lock(&ailp->ail_lock);
706 /* xfs_trans_ail_update_bulk drops ailp->ail_lock */
707 xfs_trans_ail_update_bulk(ailp, cur, log_items, nr_items, commit_lsn);
708
709 for (i = 0; i < nr_items; i++) {
710 struct xfs_log_item *lip = log_items[i];
711
712 if (lip->li_ops->iop_unpin)
713 lip->li_ops->iop_unpin(lip, 0);
714 }
715}
716
717/*
718 * Bulk operation version of xfs_trans_committed that takes a log vector of
719 * items to insert into the AIL. This uses bulk AIL insertion techniques to
720 * minimise lock traffic.
721 *
722 * If we are called with the aborted flag set, it is because a log write during
723 * a CIL checkpoint commit has failed. In this case, all the items in the
724 * checkpoint have already gone through iop_committed and iop_committing, which
725 * means that checkpoint commit abort handling is treated exactly the same
726 * as an iclog write error even though we haven't started any IO yet. Hence in
727 * this case all we need to do is iop_committed processing, followed by an
728 * iop_unpin(aborted) call.
729 *
730 * The AIL cursor is used to optimise the insert process. If commit_lsn is not
731 * at the end of the AIL, the insert cursor avoids the need to walk
732 * the AIL to find the insertion point on every xfs_log_item_batch_insert()
733 * call. This saves a lot of needless list walking and is a net win, even
734 * though it slightly increases that amount of AIL lock traffic to set it up
735 * and tear it down.
736 */
737void
738xfs_trans_committed_bulk(
739 struct xfs_ail *ailp,
740 struct xfs_log_vec *log_vector,
741 xfs_lsn_t commit_lsn,
742 bool aborted)
743{
744#define LOG_ITEM_BATCH_SIZE 32
745 struct xfs_log_item *log_items[LOG_ITEM_BATCH_SIZE];
746 struct xfs_log_vec *lv;
747 struct xfs_ail_cursor cur;
748 int i = 0;
749
750 spin_lock(&ailp->ail_lock);
751 xfs_trans_ail_cursor_last(ailp, &cur, commit_lsn);
752 spin_unlock(&ailp->ail_lock);
753
754 /* unpin all the log items */
755 for (lv = log_vector; lv; lv = lv->lv_next ) {
756 struct xfs_log_item *lip = lv->lv_item;
757 xfs_lsn_t item_lsn;
758
759 if (aborted)
760 set_bit(XFS_LI_ABORTED, &lip->li_flags);
761
762 if (lip->li_ops->flags & XFS_ITEM_RELEASE_WHEN_COMMITTED) {
763 lip->li_ops->iop_release(lip);
764 continue;
765 }
766
767 if (lip->li_ops->iop_committed)
768 item_lsn = lip->li_ops->iop_committed(lip, commit_lsn);
769 else
770 item_lsn = commit_lsn;
771
772 /* item_lsn of -1 means the item needs no further processing */
773 if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
774 continue;
775
776 /*
777 * if we are aborting the operation, no point in inserting the
778 * object into the AIL as we are in a shutdown situation.
779 */
780 if (aborted) {
781 ASSERT(XFS_FORCED_SHUTDOWN(ailp->ail_mount));
782 if (lip->li_ops->iop_unpin)
783 lip->li_ops->iop_unpin(lip, 1);
784 continue;
785 }
786
787 if (item_lsn != commit_lsn) {
788
789 /*
790 * Not a bulk update option due to unusual item_lsn.
791 * Push into AIL immediately, rechecking the lsn once
792 * we have the ail lock. Then unpin the item. This does
793 * not affect the AIL cursor the bulk insert path is
794 * using.
795 */
796 spin_lock(&ailp->ail_lock);
797 if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0)
798 xfs_trans_ail_update(ailp, lip, item_lsn);
799 else
800 spin_unlock(&ailp->ail_lock);
801 if (lip->li_ops->iop_unpin)
802 lip->li_ops->iop_unpin(lip, 0);
803 continue;
804 }
805
806 /* Item is a candidate for bulk AIL insert. */
807 log_items[i++] = lv->lv_item;
808 if (i >= LOG_ITEM_BATCH_SIZE) {
809 xfs_log_item_batch_insert(ailp, &cur, log_items,
810 LOG_ITEM_BATCH_SIZE, commit_lsn);
811 i = 0;
812 }
813 }
814
815 /* make sure we insert the remainder! */
816 if (i)
817 xfs_log_item_batch_insert(ailp, &cur, log_items, i, commit_lsn);
818
819 spin_lock(&ailp->ail_lock);
820 xfs_trans_ail_cursor_done(&cur);
821 spin_unlock(&ailp->ail_lock);
822}
823
824/*
825 * Commit the given transaction to the log.
826 *
827 * XFS disk error handling mechanism is not based on a typical
828 * transaction abort mechanism. Logically after the filesystem
829 * gets marked 'SHUTDOWN', we can't let any new transactions
830 * be durable - ie. committed to disk - because some metadata might
831 * be inconsistent. In such cases, this returns an error, and the
832 * caller may assume that all locked objects joined to the transaction
833 * have already been unlocked as if the commit had succeeded.
834 * Do not reference the transaction structure after this call.
835 */
836static int
837__xfs_trans_commit(
838 struct xfs_trans *tp,
839 bool regrant)
840{
841 struct xfs_mount *mp = tp->t_mountp;
842 xfs_csn_t commit_seq = 0;
843 int error = 0;
844 int sync = tp->t_flags & XFS_TRANS_SYNC;
845
846 trace_xfs_trans_commit(tp, _RET_IP_);
847
848 /*
849 * Finish deferred items on final commit. Only permanent transactions
850 * should ever have deferred ops.
851 */
852 WARN_ON_ONCE(!list_empty(&tp->t_dfops) &&
853 !(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
854 if (!regrant && (tp->t_flags & XFS_TRANS_PERM_LOG_RES)) {
855 error = xfs_defer_finish_noroll(&tp);
856 if (error)
857 goto out_unreserve;
858 }
859
860 /*
861 * If there is nothing to be logged by the transaction,
862 * then unlock all of the items associated with the
863 * transaction and free the transaction structure.
864 * Also make sure to return any reserved blocks to
865 * the free pool.
866 */
867 if (!(tp->t_flags & XFS_TRANS_DIRTY))
868 goto out_unreserve;
869
870 if (XFS_FORCED_SHUTDOWN(mp)) {
871 error = -EIO;
872 goto out_unreserve;
873 }
874
875 ASSERT(tp->t_ticket != NULL);
876
877 /*
878 * If we need to update the superblock, then do it now.
879 */
880 if (tp->t_flags & XFS_TRANS_SB_DIRTY)
881 xfs_trans_apply_sb_deltas(tp);
882 xfs_trans_apply_dquot_deltas(tp);
883
884 xlog_cil_commit(mp->m_log, tp, &commit_seq, regrant);
885
886 xfs_trans_free(tp);
887
888 /*
889 * If the transaction needs to be synchronous, then force the
890 * log out now and wait for it.
891 */
892 if (sync) {
893 error = xfs_log_force_seq(mp, commit_seq, XFS_LOG_SYNC, NULL);
894 XFS_STATS_INC(mp, xs_trans_sync);
895 } else {
896 XFS_STATS_INC(mp, xs_trans_async);
897 }
898
899 return error;
900
901out_unreserve:
902 xfs_trans_unreserve_and_mod_sb(tp);
903
904 /*
905 * It is indeed possible for the transaction to be not dirty but
906 * the dqinfo portion to be. All that means is that we have some
907 * (non-persistent) quota reservations that need to be unreserved.
908 */
909 xfs_trans_unreserve_and_mod_dquots(tp);
910 if (tp->t_ticket) {
911 if (regrant && !XLOG_FORCED_SHUTDOWN(mp->m_log))
912 xfs_log_ticket_regrant(mp->m_log, tp->t_ticket);
913 else
914 xfs_log_ticket_ungrant(mp->m_log, tp->t_ticket);
915 tp->t_ticket = NULL;
916 }
917 xfs_trans_free_items(tp, !!error);
918 xfs_trans_free(tp);
919
920 XFS_STATS_INC(mp, xs_trans_empty);
921 return error;
922}
923
924int
925xfs_trans_commit(
926 struct xfs_trans *tp)
927{
928 return __xfs_trans_commit(tp, false);
929}
930
931/*
932 * Unlock all of the transaction's items and free the transaction.
933 * The transaction must not have modified any of its items, because
934 * there is no way to restore them to their previous state.
935 *
936 * If the transaction has made a log reservation, make sure to release
937 * it as well.
938 */
939void
940xfs_trans_cancel(
941 struct xfs_trans *tp)
942{
943 struct xfs_mount *mp = tp->t_mountp;
944 bool dirty = (tp->t_flags & XFS_TRANS_DIRTY);
945
946 trace_xfs_trans_cancel(tp, _RET_IP_);
947
948 if (tp->t_flags & XFS_TRANS_PERM_LOG_RES)
949 xfs_defer_cancel(tp);
950
951 /*
952 * See if the caller is relying on us to shut down the
953 * filesystem. This happens in paths where we detect
954 * corruption and decide to give up.
955 */
956 if (dirty && !XFS_FORCED_SHUTDOWN(mp)) {
957 XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
958 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
959 }
960#ifdef DEBUG
961 if (!dirty && !XFS_FORCED_SHUTDOWN(mp)) {
962 struct xfs_log_item *lip;
963
964 list_for_each_entry(lip, &tp->t_items, li_trans)
965 ASSERT(!xlog_item_is_intent_done(lip));
966 }
967#endif
968 xfs_trans_unreserve_and_mod_sb(tp);
969 xfs_trans_unreserve_and_mod_dquots(tp);
970
971 if (tp->t_ticket) {
972 xfs_log_ticket_ungrant(mp->m_log, tp->t_ticket);
973 tp->t_ticket = NULL;
974 }
975
976 xfs_trans_free_items(tp, dirty);
977 xfs_trans_free(tp);
978}
979
980/*
981 * Roll from one trans in the sequence of PERMANENT transactions to
982 * the next: permanent transactions are only flushed out when
983 * committed with xfs_trans_commit(), but we still want as soon
984 * as possible to let chunks of it go to the log. So we commit the
985 * chunk we've been working on and get a new transaction to continue.
986 */
987int
988xfs_trans_roll(
989 struct xfs_trans **tpp)
990{
991 struct xfs_trans *trans = *tpp;
992 struct xfs_trans_res tres;
993 int error;
994
995 trace_xfs_trans_roll(trans, _RET_IP_);
996
997 /*
998 * Copy the critical parameters from one trans to the next.
999 */
1000 tres.tr_logres = trans->t_log_res;
1001 tres.tr_logcount = trans->t_log_count;
1002
1003 *tpp = xfs_trans_dup(trans);
1004
1005 /*
1006 * Commit the current transaction.
1007 * If this commit failed, then it'd just unlock those items that
1008 * are not marked ihold. That also means that a filesystem shutdown
1009 * is in progress. The caller takes the responsibility to cancel
1010 * the duplicate transaction that gets returned.
1011 */
1012 error = __xfs_trans_commit(trans, true);
1013 if (error)
1014 return error;
1015
1016 /*
1017 * Reserve space in the log for the next transaction.
1018 * This also pushes items in the "AIL", the list of logged items,
1019 * out to disk if they are taking up space at the tail of the log
1020 * that we want to use. This requires that either nothing be locked
1021 * across this call, or that anything that is locked be logged in
1022 * the prior and the next transactions.
1023 */
1024 tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
1025 return xfs_trans_reserve(*tpp, &tres, 0, 0);
1026}
1027
1028/*
1029 * Allocate an transaction, lock and join the inode to it, and reserve quota.
1030 *
1031 * The caller must ensure that the on-disk dquots attached to this inode have
1032 * already been allocated and initialized. The caller is responsible for
1033 * releasing ILOCK_EXCL if a new transaction is returned.
1034 */
1035int
1036xfs_trans_alloc_inode(
1037 struct xfs_inode *ip,
1038 struct xfs_trans_res *resv,
1039 unsigned int dblocks,
1040 unsigned int rblocks,
1041 bool force,
1042 struct xfs_trans **tpp)
1043{
1044 struct xfs_trans *tp;
1045 struct xfs_mount *mp = ip->i_mount;
1046 bool retried = false;
1047 int error;
1048
1049retry:
1050 error = xfs_trans_alloc(mp, resv, dblocks,
1051 rblocks / mp->m_sb.sb_rextsize,
1052 force ? XFS_TRANS_RESERVE : 0, &tp);
1053 if (error)
1054 return error;
1055
1056 xfs_ilock(ip, XFS_ILOCK_EXCL);
1057 xfs_trans_ijoin(tp, ip, 0);
1058
1059 error = xfs_qm_dqattach_locked(ip, false);
1060 if (error) {
1061 /* Caller should have allocated the dquots! */
1062 ASSERT(error != -ENOENT);
1063 goto out_cancel;
1064 }
1065
1066 error = xfs_trans_reserve_quota_nblks(tp, ip, dblocks, rblocks, force);
1067 if ((error == -EDQUOT || error == -ENOSPC) && !retried) {
1068 xfs_trans_cancel(tp);
1069 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1070 xfs_blockgc_free_quota(ip, 0);
1071 retried = true;
1072 goto retry;
1073 }
1074 if (error)
1075 goto out_cancel;
1076
1077 *tpp = tp;
1078 return 0;
1079
1080out_cancel:
1081 xfs_trans_cancel(tp);
1082 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1083 return error;
1084}
1085
1086/*
1087 * Allocate an transaction in preparation for inode creation by reserving quota
1088 * against the given dquots. Callers are not required to hold any inode locks.
1089 */
1090int
1091xfs_trans_alloc_icreate(
1092 struct xfs_mount *mp,
1093 struct xfs_trans_res *resv,
1094 struct xfs_dquot *udqp,
1095 struct xfs_dquot *gdqp,
1096 struct xfs_dquot *pdqp,
1097 unsigned int dblocks,
1098 struct xfs_trans **tpp)
1099{
1100 struct xfs_trans *tp;
1101 bool retried = false;
1102 int error;
1103
1104retry:
1105 error = xfs_trans_alloc(mp, resv, dblocks, 0, 0, &tp);
1106 if (error)
1107 return error;
1108
1109 error = xfs_trans_reserve_quota_icreate(tp, udqp, gdqp, pdqp, dblocks);
1110 if ((error == -EDQUOT || error == -ENOSPC) && !retried) {
1111 xfs_trans_cancel(tp);
1112 xfs_blockgc_free_dquots(mp, udqp, gdqp, pdqp, 0);
1113 retried = true;
1114 goto retry;
1115 }
1116 if (error) {
1117 xfs_trans_cancel(tp);
1118 return error;
1119 }
1120
1121 *tpp = tp;
1122 return 0;
1123}
1124
1125/*
1126 * Allocate an transaction, lock and join the inode to it, and reserve quota
1127 * in preparation for inode attribute changes that include uid, gid, or prid
1128 * changes.
1129 *
1130 * The caller must ensure that the on-disk dquots attached to this inode have
1131 * already been allocated and initialized. The ILOCK will be dropped when the
1132 * transaction is committed or cancelled.
1133 */
1134int
1135xfs_trans_alloc_ichange(
1136 struct xfs_inode *ip,
1137 struct xfs_dquot *new_udqp,
1138 struct xfs_dquot *new_gdqp,
1139 struct xfs_dquot *new_pdqp,
1140 bool force,
1141 struct xfs_trans **tpp)
1142{
1143 struct xfs_trans *tp;
1144 struct xfs_mount *mp = ip->i_mount;
1145 struct xfs_dquot *udqp;
1146 struct xfs_dquot *gdqp;
1147 struct xfs_dquot *pdqp;
1148 bool retried = false;
1149 int error;
1150
1151retry:
1152 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
1153 if (error)
1154 return error;
1155
1156 xfs_ilock(ip, XFS_ILOCK_EXCL);
1157 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1158
1159 error = xfs_qm_dqattach_locked(ip, false);
1160 if (error) {
1161 /* Caller should have allocated the dquots! */
1162 ASSERT(error != -ENOENT);
1163 goto out_cancel;
1164 }
1165
1166 /*
1167 * For each quota type, skip quota reservations if the inode's dquots
1168 * now match the ones that came from the caller, or the caller didn't
1169 * pass one in. The inode's dquots can change if we drop the ILOCK to
1170 * perform a blockgc scan, so we must preserve the caller's arguments.
1171 */
1172 udqp = (new_udqp != ip->i_udquot) ? new_udqp : NULL;
1173 gdqp = (new_gdqp != ip->i_gdquot) ? new_gdqp : NULL;
1174 pdqp = (new_pdqp != ip->i_pdquot) ? new_pdqp : NULL;
1175 if (udqp || gdqp || pdqp) {
1176 unsigned int qflags = XFS_QMOPT_RES_REGBLKS;
1177
1178 if (force)
1179 qflags |= XFS_QMOPT_FORCE_RES;
1180
1181 /*
1182 * Reserve enough quota to handle blocks on disk and reserved
1183 * for a delayed allocation. We'll actually transfer the
1184 * delalloc reservation between dquots at chown time, even
1185 * though that part is only semi-transactional.
1186 */
1187 error = xfs_trans_reserve_quota_bydquots(tp, mp, udqp, gdqp,
1188 pdqp, ip->i_nblocks + ip->i_delayed_blks,
1189 1, qflags);
1190 if ((error == -EDQUOT || error == -ENOSPC) && !retried) {
1191 xfs_trans_cancel(tp);
1192 xfs_blockgc_free_dquots(mp, udqp, gdqp, pdqp, 0);
1193 retried = true;
1194 goto retry;
1195 }
1196 if (error)
1197 goto out_cancel;
1198 }
1199
1200 *tpp = tp;
1201 return 0;
1202
1203out_cancel:
1204 xfs_trans_cancel(tp);
1205 return error;
1206}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
4 * Copyright (C) 2010 Red Hat, Inc.
5 * All Rights Reserved.
6 */
7#include "xfs.h"
8#include "xfs_fs.h"
9#include "xfs_shared.h"
10#include "xfs_format.h"
11#include "xfs_log_format.h"
12#include "xfs_trans_resv.h"
13#include "xfs_mount.h"
14#include "xfs_extent_busy.h"
15#include "xfs_quota.h"
16#include "xfs_trans.h"
17#include "xfs_trans_priv.h"
18#include "xfs_log.h"
19#include "xfs_trace.h"
20#include "xfs_error.h"
21#include "xfs_defer.h"
22
23kmem_zone_t *xfs_trans_zone;
24
25#if defined(CONFIG_TRACEPOINTS)
26static void
27xfs_trans_trace_reservations(
28 struct xfs_mount *mp)
29{
30 struct xfs_trans_res resv;
31 struct xfs_trans_res *res;
32 struct xfs_trans_res *end_res;
33 int i;
34
35 res = (struct xfs_trans_res *)M_RES(mp);
36 end_res = (struct xfs_trans_res *)(M_RES(mp) + 1);
37 for (i = 0; res < end_res; i++, res++)
38 trace_xfs_trans_resv_calc(mp, i, res);
39 xfs_log_get_max_trans_res(mp, &resv);
40 trace_xfs_trans_resv_calc(mp, -1, &resv);
41}
42#else
43# define xfs_trans_trace_reservations(mp)
44#endif
45
46/*
47 * Initialize the precomputed transaction reservation values
48 * in the mount structure.
49 */
50void
51xfs_trans_init(
52 struct xfs_mount *mp)
53{
54 xfs_trans_resv_calc(mp, M_RES(mp));
55 xfs_trans_trace_reservations(mp);
56}
57
58/*
59 * Free the transaction structure. If there is more clean up
60 * to do when the structure is freed, add it here.
61 */
62STATIC void
63xfs_trans_free(
64 struct xfs_trans *tp)
65{
66 xfs_extent_busy_sort(&tp->t_busy);
67 xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false);
68
69 trace_xfs_trans_free(tp, _RET_IP_);
70 atomic_dec(&tp->t_mountp->m_active_trans);
71 if (!(tp->t_flags & XFS_TRANS_NO_WRITECOUNT))
72 sb_end_intwrite(tp->t_mountp->m_super);
73 xfs_trans_free_dqinfo(tp);
74 kmem_zone_free(xfs_trans_zone, tp);
75}
76
77/*
78 * This is called to create a new transaction which will share the
79 * permanent log reservation of the given transaction. The remaining
80 * unused block and rt extent reservations are also inherited. This
81 * implies that the original transaction is no longer allowed to allocate
82 * blocks. Locks and log items, however, are no inherited. They must
83 * be added to the new transaction explicitly.
84 */
85STATIC struct xfs_trans *
86xfs_trans_dup(
87 struct xfs_trans *tp)
88{
89 struct xfs_trans *ntp;
90
91 trace_xfs_trans_dup(tp, _RET_IP_);
92
93 ntp = kmem_zone_zalloc(xfs_trans_zone, 0);
94
95 /*
96 * Initialize the new transaction structure.
97 */
98 ntp->t_magic = XFS_TRANS_HEADER_MAGIC;
99 ntp->t_mountp = tp->t_mountp;
100 INIT_LIST_HEAD(&ntp->t_items);
101 INIT_LIST_HEAD(&ntp->t_busy);
102 INIT_LIST_HEAD(&ntp->t_dfops);
103 ntp->t_firstblock = NULLFSBLOCK;
104
105 ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
106 ASSERT(tp->t_ticket != NULL);
107
108 ntp->t_flags = XFS_TRANS_PERM_LOG_RES |
109 (tp->t_flags & XFS_TRANS_RESERVE) |
110 (tp->t_flags & XFS_TRANS_NO_WRITECOUNT);
111 /* We gave our writer reference to the new transaction */
112 tp->t_flags |= XFS_TRANS_NO_WRITECOUNT;
113 ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
114
115 ASSERT(tp->t_blk_res >= tp->t_blk_res_used);
116 ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
117 tp->t_blk_res = tp->t_blk_res_used;
118
119 ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
120 tp->t_rtx_res = tp->t_rtx_res_used;
121 ntp->t_pflags = tp->t_pflags;
122
123 /* move deferred ops over to the new tp */
124 xfs_defer_move(ntp, tp);
125
126 xfs_trans_dup_dqinfo(tp, ntp);
127
128 atomic_inc(&tp->t_mountp->m_active_trans);
129 return ntp;
130}
131
132/*
133 * This is called to reserve free disk blocks and log space for the
134 * given transaction. This must be done before allocating any resources
135 * within the transaction.
136 *
137 * This will return ENOSPC if there are not enough blocks available.
138 * It will sleep waiting for available log space.
139 * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
140 * is used by long running transactions. If any one of the reservations
141 * fails then they will all be backed out.
142 *
143 * This does not do quota reservations. That typically is done by the
144 * caller afterwards.
145 */
146static int
147xfs_trans_reserve(
148 struct xfs_trans *tp,
149 struct xfs_trans_res *resp,
150 uint blocks,
151 uint rtextents)
152{
153 int error = 0;
154 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
155
156 /* Mark this thread as being in a transaction */
157 current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
158
159 /*
160 * Attempt to reserve the needed disk blocks by decrementing
161 * the number needed from the number available. This will
162 * fail if the count would go below zero.
163 */
164 if (blocks > 0) {
165 error = xfs_mod_fdblocks(tp->t_mountp, -((int64_t)blocks), rsvd);
166 if (error != 0) {
167 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
168 return -ENOSPC;
169 }
170 tp->t_blk_res += blocks;
171 }
172
173 /*
174 * Reserve the log space needed for this transaction.
175 */
176 if (resp->tr_logres > 0) {
177 bool permanent = false;
178
179 ASSERT(tp->t_log_res == 0 ||
180 tp->t_log_res == resp->tr_logres);
181 ASSERT(tp->t_log_count == 0 ||
182 tp->t_log_count == resp->tr_logcount);
183
184 if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
185 tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
186 permanent = true;
187 } else {
188 ASSERT(tp->t_ticket == NULL);
189 ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
190 }
191
192 if (tp->t_ticket != NULL) {
193 ASSERT(resp->tr_logflags & XFS_TRANS_PERM_LOG_RES);
194 error = xfs_log_regrant(tp->t_mountp, tp->t_ticket);
195 } else {
196 error = xfs_log_reserve(tp->t_mountp,
197 resp->tr_logres,
198 resp->tr_logcount,
199 &tp->t_ticket, XFS_TRANSACTION,
200 permanent);
201 }
202
203 if (error)
204 goto undo_blocks;
205
206 tp->t_log_res = resp->tr_logres;
207 tp->t_log_count = resp->tr_logcount;
208 }
209
210 /*
211 * Attempt to reserve the needed realtime extents by decrementing
212 * the number needed from the number available. This will
213 * fail if the count would go below zero.
214 */
215 if (rtextents > 0) {
216 error = xfs_mod_frextents(tp->t_mountp, -((int64_t)rtextents));
217 if (error) {
218 error = -ENOSPC;
219 goto undo_log;
220 }
221 tp->t_rtx_res += rtextents;
222 }
223
224 return 0;
225
226 /*
227 * Error cases jump to one of these labels to undo any
228 * reservations which have already been performed.
229 */
230undo_log:
231 if (resp->tr_logres > 0) {
232 xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, false);
233 tp->t_ticket = NULL;
234 tp->t_log_res = 0;
235 tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
236 }
237
238undo_blocks:
239 if (blocks > 0) {
240 xfs_mod_fdblocks(tp->t_mountp, (int64_t)blocks, rsvd);
241 tp->t_blk_res = 0;
242 }
243
244 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
245
246 return error;
247}
248
249int
250xfs_trans_alloc(
251 struct xfs_mount *mp,
252 struct xfs_trans_res *resp,
253 uint blocks,
254 uint rtextents,
255 uint flags,
256 struct xfs_trans **tpp)
257{
258 struct xfs_trans *tp;
259 int error;
260
261 /*
262 * Allocate the handle before we do our freeze accounting and setting up
263 * GFP_NOFS allocation context so that we avoid lockdep false positives
264 * by doing GFP_KERNEL allocations inside sb_start_intwrite().
265 */
266 tp = kmem_zone_zalloc(xfs_trans_zone, 0);
267 if (!(flags & XFS_TRANS_NO_WRITECOUNT))
268 sb_start_intwrite(mp->m_super);
269
270 /*
271 * Zero-reservation ("empty") transactions can't modify anything, so
272 * they're allowed to run while we're frozen.
273 */
274 WARN_ON(resp->tr_logres > 0 &&
275 mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
276 atomic_inc(&mp->m_active_trans);
277
278 tp->t_magic = XFS_TRANS_HEADER_MAGIC;
279 tp->t_flags = flags;
280 tp->t_mountp = mp;
281 INIT_LIST_HEAD(&tp->t_items);
282 INIT_LIST_HEAD(&tp->t_busy);
283 INIT_LIST_HEAD(&tp->t_dfops);
284 tp->t_firstblock = NULLFSBLOCK;
285
286 error = xfs_trans_reserve(tp, resp, blocks, rtextents);
287 if (error) {
288 xfs_trans_cancel(tp);
289 return error;
290 }
291
292 trace_xfs_trans_alloc(tp, _RET_IP_);
293
294 *tpp = tp;
295 return 0;
296}
297
298/*
299 * Create an empty transaction with no reservation. This is a defensive
300 * mechanism for routines that query metadata without actually modifying
301 * them -- if the metadata being queried is somehow cross-linked (think a
302 * btree block pointer that points higher in the tree), we risk deadlock.
303 * However, blocks grabbed as part of a transaction can be re-grabbed.
304 * The verifiers will notice the corrupt block and the operation will fail
305 * back to userspace without deadlocking.
306 *
307 * Note the zero-length reservation; this transaction MUST be cancelled
308 * without any dirty data.
309 */
310int
311xfs_trans_alloc_empty(
312 struct xfs_mount *mp,
313 struct xfs_trans **tpp)
314{
315 struct xfs_trans_res resv = {0};
316
317 return xfs_trans_alloc(mp, &resv, 0, 0, XFS_TRANS_NO_WRITECOUNT, tpp);
318}
319
320/*
321 * Record the indicated change to the given field for application
322 * to the file system's superblock when the transaction commits.
323 * For now, just store the change in the transaction structure.
324 *
325 * Mark the transaction structure to indicate that the superblock
326 * needs to be updated before committing.
327 *
328 * Because we may not be keeping track of allocated/free inodes and
329 * used filesystem blocks in the superblock, we do not mark the
330 * superblock dirty in this transaction if we modify these fields.
331 * We still need to update the transaction deltas so that they get
332 * applied to the incore superblock, but we don't want them to
333 * cause the superblock to get locked and logged if these are the
334 * only fields in the superblock that the transaction modifies.
335 */
336void
337xfs_trans_mod_sb(
338 xfs_trans_t *tp,
339 uint field,
340 int64_t delta)
341{
342 uint32_t flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
343 xfs_mount_t *mp = tp->t_mountp;
344
345 switch (field) {
346 case XFS_TRANS_SB_ICOUNT:
347 tp->t_icount_delta += delta;
348 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
349 flags &= ~XFS_TRANS_SB_DIRTY;
350 break;
351 case XFS_TRANS_SB_IFREE:
352 tp->t_ifree_delta += delta;
353 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
354 flags &= ~XFS_TRANS_SB_DIRTY;
355 break;
356 case XFS_TRANS_SB_FDBLOCKS:
357 /*
358 * Track the number of blocks allocated in the transaction.
359 * Make sure it does not exceed the number reserved. If so,
360 * shutdown as this can lead to accounting inconsistency.
361 */
362 if (delta < 0) {
363 tp->t_blk_res_used += (uint)-delta;
364 if (tp->t_blk_res_used > tp->t_blk_res)
365 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
366 }
367 tp->t_fdblocks_delta += delta;
368 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
369 flags &= ~XFS_TRANS_SB_DIRTY;
370 break;
371 case XFS_TRANS_SB_RES_FDBLOCKS:
372 /*
373 * The allocation has already been applied to the
374 * in-core superblock's counter. This should only
375 * be applied to the on-disk superblock.
376 */
377 tp->t_res_fdblocks_delta += delta;
378 if (xfs_sb_version_haslazysbcount(&mp->m_sb))
379 flags &= ~XFS_TRANS_SB_DIRTY;
380 break;
381 case XFS_TRANS_SB_FREXTENTS:
382 /*
383 * Track the number of blocks allocated in the
384 * transaction. Make sure it does not exceed the
385 * number reserved.
386 */
387 if (delta < 0) {
388 tp->t_rtx_res_used += (uint)-delta;
389 ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
390 }
391 tp->t_frextents_delta += delta;
392 break;
393 case XFS_TRANS_SB_RES_FREXTENTS:
394 /*
395 * The allocation has already been applied to the
396 * in-core superblock's counter. This should only
397 * be applied to the on-disk superblock.
398 */
399 ASSERT(delta < 0);
400 tp->t_res_frextents_delta += delta;
401 break;
402 case XFS_TRANS_SB_DBLOCKS:
403 ASSERT(delta > 0);
404 tp->t_dblocks_delta += delta;
405 break;
406 case XFS_TRANS_SB_AGCOUNT:
407 ASSERT(delta > 0);
408 tp->t_agcount_delta += delta;
409 break;
410 case XFS_TRANS_SB_IMAXPCT:
411 tp->t_imaxpct_delta += delta;
412 break;
413 case XFS_TRANS_SB_REXTSIZE:
414 tp->t_rextsize_delta += delta;
415 break;
416 case XFS_TRANS_SB_RBMBLOCKS:
417 tp->t_rbmblocks_delta += delta;
418 break;
419 case XFS_TRANS_SB_RBLOCKS:
420 tp->t_rblocks_delta += delta;
421 break;
422 case XFS_TRANS_SB_REXTENTS:
423 tp->t_rextents_delta += delta;
424 break;
425 case XFS_TRANS_SB_REXTSLOG:
426 tp->t_rextslog_delta += delta;
427 break;
428 default:
429 ASSERT(0);
430 return;
431 }
432
433 tp->t_flags |= flags;
434}
435
436/*
437 * xfs_trans_apply_sb_deltas() is called from the commit code
438 * to bring the superblock buffer into the current transaction
439 * and modify it as requested by earlier calls to xfs_trans_mod_sb().
440 *
441 * For now we just look at each field allowed to change and change
442 * it if necessary.
443 */
444STATIC void
445xfs_trans_apply_sb_deltas(
446 xfs_trans_t *tp)
447{
448 xfs_dsb_t *sbp;
449 xfs_buf_t *bp;
450 int whole = 0;
451
452 bp = xfs_trans_getsb(tp, tp->t_mountp);
453 sbp = XFS_BUF_TO_SBP(bp);
454
455 /*
456 * Check that superblock mods match the mods made to AGF counters.
457 */
458 ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
459 (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
460 tp->t_ag_btree_delta));
461
462 /*
463 * Only update the superblock counters if we are logging them
464 */
465 if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
466 if (tp->t_icount_delta)
467 be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
468 if (tp->t_ifree_delta)
469 be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
470 if (tp->t_fdblocks_delta)
471 be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
472 if (tp->t_res_fdblocks_delta)
473 be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
474 }
475
476 if (tp->t_frextents_delta)
477 be64_add_cpu(&sbp->sb_frextents, tp->t_frextents_delta);
478 if (tp->t_res_frextents_delta)
479 be64_add_cpu(&sbp->sb_frextents, tp->t_res_frextents_delta);
480
481 if (tp->t_dblocks_delta) {
482 be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
483 whole = 1;
484 }
485 if (tp->t_agcount_delta) {
486 be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
487 whole = 1;
488 }
489 if (tp->t_imaxpct_delta) {
490 sbp->sb_imax_pct += tp->t_imaxpct_delta;
491 whole = 1;
492 }
493 if (tp->t_rextsize_delta) {
494 be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
495 whole = 1;
496 }
497 if (tp->t_rbmblocks_delta) {
498 be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
499 whole = 1;
500 }
501 if (tp->t_rblocks_delta) {
502 be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
503 whole = 1;
504 }
505 if (tp->t_rextents_delta) {
506 be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
507 whole = 1;
508 }
509 if (tp->t_rextslog_delta) {
510 sbp->sb_rextslog += tp->t_rextslog_delta;
511 whole = 1;
512 }
513
514 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
515 if (whole)
516 /*
517 * Log the whole thing, the fields are noncontiguous.
518 */
519 xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
520 else
521 /*
522 * Since all the modifiable fields are contiguous, we
523 * can get away with this.
524 */
525 xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
526 offsetof(xfs_dsb_t, sb_frextents) +
527 sizeof(sbp->sb_frextents) - 1);
528}
529
530STATIC int
531xfs_sb_mod8(
532 uint8_t *field,
533 int8_t delta)
534{
535 int8_t counter = *field;
536
537 counter += delta;
538 if (counter < 0) {
539 ASSERT(0);
540 return -EINVAL;
541 }
542 *field = counter;
543 return 0;
544}
545
546STATIC int
547xfs_sb_mod32(
548 uint32_t *field,
549 int32_t delta)
550{
551 int32_t counter = *field;
552
553 counter += delta;
554 if (counter < 0) {
555 ASSERT(0);
556 return -EINVAL;
557 }
558 *field = counter;
559 return 0;
560}
561
562STATIC int
563xfs_sb_mod64(
564 uint64_t *field,
565 int64_t delta)
566{
567 int64_t counter = *field;
568
569 counter += delta;
570 if (counter < 0) {
571 ASSERT(0);
572 return -EINVAL;
573 }
574 *field = counter;
575 return 0;
576}
577
578/*
579 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations
580 * and apply superblock counter changes to the in-core superblock. The
581 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
582 * applied to the in-core superblock. The idea is that that has already been
583 * done.
584 *
585 * If we are not logging superblock counters, then the inode allocated/free and
586 * used block counts are not updated in the on disk superblock. In this case,
587 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
588 * still need to update the incore superblock with the changes.
589 */
590void
591xfs_trans_unreserve_and_mod_sb(
592 struct xfs_trans *tp)
593{
594 struct xfs_mount *mp = tp->t_mountp;
595 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
596 int64_t blkdelta = 0;
597 int64_t rtxdelta = 0;
598 int64_t idelta = 0;
599 int64_t ifreedelta = 0;
600 int error;
601
602 /* calculate deltas */
603 if (tp->t_blk_res > 0)
604 blkdelta = tp->t_blk_res;
605 if ((tp->t_fdblocks_delta != 0) &&
606 (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
607 (tp->t_flags & XFS_TRANS_SB_DIRTY)))
608 blkdelta += tp->t_fdblocks_delta;
609
610 if (tp->t_rtx_res > 0)
611 rtxdelta = tp->t_rtx_res;
612 if ((tp->t_frextents_delta != 0) &&
613 (tp->t_flags & XFS_TRANS_SB_DIRTY))
614 rtxdelta += tp->t_frextents_delta;
615
616 if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
617 (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
618 idelta = tp->t_icount_delta;
619 ifreedelta = tp->t_ifree_delta;
620 }
621
622 /* apply the per-cpu counters */
623 if (blkdelta) {
624 error = xfs_mod_fdblocks(mp, blkdelta, rsvd);
625 if (error)
626 goto out;
627 }
628
629 if (idelta) {
630 error = xfs_mod_icount(mp, idelta);
631 if (error)
632 goto out_undo_fdblocks;
633 }
634
635 if (ifreedelta) {
636 error = xfs_mod_ifree(mp, ifreedelta);
637 if (error)
638 goto out_undo_icount;
639 }
640
641 if (rtxdelta == 0 && !(tp->t_flags & XFS_TRANS_SB_DIRTY))
642 return;
643
644 /* apply remaining deltas */
645 spin_lock(&mp->m_sb_lock);
646 if (rtxdelta) {
647 error = xfs_sb_mod64(&mp->m_sb.sb_frextents, rtxdelta);
648 if (error)
649 goto out_undo_ifree;
650 }
651
652 if (tp->t_dblocks_delta != 0) {
653 error = xfs_sb_mod64(&mp->m_sb.sb_dblocks, tp->t_dblocks_delta);
654 if (error)
655 goto out_undo_frextents;
656 }
657 if (tp->t_agcount_delta != 0) {
658 error = xfs_sb_mod32(&mp->m_sb.sb_agcount, tp->t_agcount_delta);
659 if (error)
660 goto out_undo_dblocks;
661 }
662 if (tp->t_imaxpct_delta != 0) {
663 error = xfs_sb_mod8(&mp->m_sb.sb_imax_pct, tp->t_imaxpct_delta);
664 if (error)
665 goto out_undo_agcount;
666 }
667 if (tp->t_rextsize_delta != 0) {
668 error = xfs_sb_mod32(&mp->m_sb.sb_rextsize,
669 tp->t_rextsize_delta);
670 if (error)
671 goto out_undo_imaxpct;
672 }
673 if (tp->t_rbmblocks_delta != 0) {
674 error = xfs_sb_mod32(&mp->m_sb.sb_rbmblocks,
675 tp->t_rbmblocks_delta);
676 if (error)
677 goto out_undo_rextsize;
678 }
679 if (tp->t_rblocks_delta != 0) {
680 error = xfs_sb_mod64(&mp->m_sb.sb_rblocks, tp->t_rblocks_delta);
681 if (error)
682 goto out_undo_rbmblocks;
683 }
684 if (tp->t_rextents_delta != 0) {
685 error = xfs_sb_mod64(&mp->m_sb.sb_rextents,
686 tp->t_rextents_delta);
687 if (error)
688 goto out_undo_rblocks;
689 }
690 if (tp->t_rextslog_delta != 0) {
691 error = xfs_sb_mod8(&mp->m_sb.sb_rextslog,
692 tp->t_rextslog_delta);
693 if (error)
694 goto out_undo_rextents;
695 }
696 spin_unlock(&mp->m_sb_lock);
697 return;
698
699out_undo_rextents:
700 if (tp->t_rextents_delta)
701 xfs_sb_mod64(&mp->m_sb.sb_rextents, -tp->t_rextents_delta);
702out_undo_rblocks:
703 if (tp->t_rblocks_delta)
704 xfs_sb_mod64(&mp->m_sb.sb_rblocks, -tp->t_rblocks_delta);
705out_undo_rbmblocks:
706 if (tp->t_rbmblocks_delta)
707 xfs_sb_mod32(&mp->m_sb.sb_rbmblocks, -tp->t_rbmblocks_delta);
708out_undo_rextsize:
709 if (tp->t_rextsize_delta)
710 xfs_sb_mod32(&mp->m_sb.sb_rextsize, -tp->t_rextsize_delta);
711out_undo_imaxpct:
712 if (tp->t_rextsize_delta)
713 xfs_sb_mod8(&mp->m_sb.sb_imax_pct, -tp->t_imaxpct_delta);
714out_undo_agcount:
715 if (tp->t_agcount_delta)
716 xfs_sb_mod32(&mp->m_sb.sb_agcount, -tp->t_agcount_delta);
717out_undo_dblocks:
718 if (tp->t_dblocks_delta)
719 xfs_sb_mod64(&mp->m_sb.sb_dblocks, -tp->t_dblocks_delta);
720out_undo_frextents:
721 if (rtxdelta)
722 xfs_sb_mod64(&mp->m_sb.sb_frextents, -rtxdelta);
723out_undo_ifree:
724 spin_unlock(&mp->m_sb_lock);
725 if (ifreedelta)
726 xfs_mod_ifree(mp, -ifreedelta);
727out_undo_icount:
728 if (idelta)
729 xfs_mod_icount(mp, -idelta);
730out_undo_fdblocks:
731 if (blkdelta)
732 xfs_mod_fdblocks(mp, -blkdelta, rsvd);
733out:
734 ASSERT(error == 0);
735 return;
736}
737
738/* Add the given log item to the transaction's list of log items. */
739void
740xfs_trans_add_item(
741 struct xfs_trans *tp,
742 struct xfs_log_item *lip)
743{
744 ASSERT(lip->li_mountp == tp->t_mountp);
745 ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
746 ASSERT(list_empty(&lip->li_trans));
747 ASSERT(!test_bit(XFS_LI_DIRTY, &lip->li_flags));
748
749 list_add_tail(&lip->li_trans, &tp->t_items);
750 trace_xfs_trans_add_item(tp, _RET_IP_);
751}
752
753/*
754 * Unlink the log item from the transaction. the log item is no longer
755 * considered dirty in this transaction, as the linked transaction has
756 * finished, either by abort or commit completion.
757 */
758void
759xfs_trans_del_item(
760 struct xfs_log_item *lip)
761{
762 clear_bit(XFS_LI_DIRTY, &lip->li_flags);
763 list_del_init(&lip->li_trans);
764}
765
766/* Detach and unlock all of the items in a transaction */
767static void
768xfs_trans_free_items(
769 struct xfs_trans *tp,
770 bool abort)
771{
772 struct xfs_log_item *lip, *next;
773
774 trace_xfs_trans_free_items(tp, _RET_IP_);
775
776 list_for_each_entry_safe(lip, next, &tp->t_items, li_trans) {
777 xfs_trans_del_item(lip);
778 if (abort)
779 set_bit(XFS_LI_ABORTED, &lip->li_flags);
780 if (lip->li_ops->iop_release)
781 lip->li_ops->iop_release(lip);
782 }
783}
784
785static inline void
786xfs_log_item_batch_insert(
787 struct xfs_ail *ailp,
788 struct xfs_ail_cursor *cur,
789 struct xfs_log_item **log_items,
790 int nr_items,
791 xfs_lsn_t commit_lsn)
792{
793 int i;
794
795 spin_lock(&ailp->ail_lock);
796 /* xfs_trans_ail_update_bulk drops ailp->ail_lock */
797 xfs_trans_ail_update_bulk(ailp, cur, log_items, nr_items, commit_lsn);
798
799 for (i = 0; i < nr_items; i++) {
800 struct xfs_log_item *lip = log_items[i];
801
802 if (lip->li_ops->iop_unpin)
803 lip->li_ops->iop_unpin(lip, 0);
804 }
805}
806
807/*
808 * Bulk operation version of xfs_trans_committed that takes a log vector of
809 * items to insert into the AIL. This uses bulk AIL insertion techniques to
810 * minimise lock traffic.
811 *
812 * If we are called with the aborted flag set, it is because a log write during
813 * a CIL checkpoint commit has failed. In this case, all the items in the
814 * checkpoint have already gone through iop_committed and iop_committing, which
815 * means that checkpoint commit abort handling is treated exactly the same
816 * as an iclog write error even though we haven't started any IO yet. Hence in
817 * this case all we need to do is iop_committed processing, followed by an
818 * iop_unpin(aborted) call.
819 *
820 * The AIL cursor is used to optimise the insert process. If commit_lsn is not
821 * at the end of the AIL, the insert cursor avoids the need to walk
822 * the AIL to find the insertion point on every xfs_log_item_batch_insert()
823 * call. This saves a lot of needless list walking and is a net win, even
824 * though it slightly increases that amount of AIL lock traffic to set it up
825 * and tear it down.
826 */
827void
828xfs_trans_committed_bulk(
829 struct xfs_ail *ailp,
830 struct xfs_log_vec *log_vector,
831 xfs_lsn_t commit_lsn,
832 bool aborted)
833{
834#define LOG_ITEM_BATCH_SIZE 32
835 struct xfs_log_item *log_items[LOG_ITEM_BATCH_SIZE];
836 struct xfs_log_vec *lv;
837 struct xfs_ail_cursor cur;
838 int i = 0;
839
840 spin_lock(&ailp->ail_lock);
841 xfs_trans_ail_cursor_last(ailp, &cur, commit_lsn);
842 spin_unlock(&ailp->ail_lock);
843
844 /* unpin all the log items */
845 for (lv = log_vector; lv; lv = lv->lv_next ) {
846 struct xfs_log_item *lip = lv->lv_item;
847 xfs_lsn_t item_lsn;
848
849 if (aborted)
850 set_bit(XFS_LI_ABORTED, &lip->li_flags);
851
852 if (lip->li_ops->flags & XFS_ITEM_RELEASE_WHEN_COMMITTED) {
853 lip->li_ops->iop_release(lip);
854 continue;
855 }
856
857 if (lip->li_ops->iop_committed)
858 item_lsn = lip->li_ops->iop_committed(lip, commit_lsn);
859 else
860 item_lsn = commit_lsn;
861
862 /* item_lsn of -1 means the item needs no further processing */
863 if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
864 continue;
865
866 /*
867 * if we are aborting the operation, no point in inserting the
868 * object into the AIL as we are in a shutdown situation.
869 */
870 if (aborted) {
871 ASSERT(XFS_FORCED_SHUTDOWN(ailp->ail_mount));
872 if (lip->li_ops->iop_unpin)
873 lip->li_ops->iop_unpin(lip, 1);
874 continue;
875 }
876
877 if (item_lsn != commit_lsn) {
878
879 /*
880 * Not a bulk update option due to unusual item_lsn.
881 * Push into AIL immediately, rechecking the lsn once
882 * we have the ail lock. Then unpin the item. This does
883 * not affect the AIL cursor the bulk insert path is
884 * using.
885 */
886 spin_lock(&ailp->ail_lock);
887 if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0)
888 xfs_trans_ail_update(ailp, lip, item_lsn);
889 else
890 spin_unlock(&ailp->ail_lock);
891 if (lip->li_ops->iop_unpin)
892 lip->li_ops->iop_unpin(lip, 0);
893 continue;
894 }
895
896 /* Item is a candidate for bulk AIL insert. */
897 log_items[i++] = lv->lv_item;
898 if (i >= LOG_ITEM_BATCH_SIZE) {
899 xfs_log_item_batch_insert(ailp, &cur, log_items,
900 LOG_ITEM_BATCH_SIZE, commit_lsn);
901 i = 0;
902 }
903 }
904
905 /* make sure we insert the remainder! */
906 if (i)
907 xfs_log_item_batch_insert(ailp, &cur, log_items, i, commit_lsn);
908
909 spin_lock(&ailp->ail_lock);
910 xfs_trans_ail_cursor_done(&cur);
911 spin_unlock(&ailp->ail_lock);
912}
913
914/*
915 * Commit the given transaction to the log.
916 *
917 * XFS disk error handling mechanism is not based on a typical
918 * transaction abort mechanism. Logically after the filesystem
919 * gets marked 'SHUTDOWN', we can't let any new transactions
920 * be durable - ie. committed to disk - because some metadata might
921 * be inconsistent. In such cases, this returns an error, and the
922 * caller may assume that all locked objects joined to the transaction
923 * have already been unlocked as if the commit had succeeded.
924 * Do not reference the transaction structure after this call.
925 */
926static int
927__xfs_trans_commit(
928 struct xfs_trans *tp,
929 bool regrant)
930{
931 struct xfs_mount *mp = tp->t_mountp;
932 xfs_lsn_t commit_lsn = -1;
933 int error = 0;
934 int sync = tp->t_flags & XFS_TRANS_SYNC;
935
936 trace_xfs_trans_commit(tp, _RET_IP_);
937
938 /*
939 * Finish deferred items on final commit. Only permanent transactions
940 * should ever have deferred ops.
941 */
942 WARN_ON_ONCE(!list_empty(&tp->t_dfops) &&
943 !(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
944 if (!regrant && (tp->t_flags & XFS_TRANS_PERM_LOG_RES)) {
945 error = xfs_defer_finish_noroll(&tp);
946 if (error)
947 goto out_unreserve;
948 }
949
950 /*
951 * If there is nothing to be logged by the transaction,
952 * then unlock all of the items associated with the
953 * transaction and free the transaction structure.
954 * Also make sure to return any reserved blocks to
955 * the free pool.
956 */
957 if (!(tp->t_flags & XFS_TRANS_DIRTY))
958 goto out_unreserve;
959
960 if (XFS_FORCED_SHUTDOWN(mp)) {
961 error = -EIO;
962 goto out_unreserve;
963 }
964
965 ASSERT(tp->t_ticket != NULL);
966
967 /*
968 * If we need to update the superblock, then do it now.
969 */
970 if (tp->t_flags & XFS_TRANS_SB_DIRTY)
971 xfs_trans_apply_sb_deltas(tp);
972 xfs_trans_apply_dquot_deltas(tp);
973
974 xfs_log_commit_cil(mp, tp, &commit_lsn, regrant);
975
976 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
977 xfs_trans_free(tp);
978
979 /*
980 * If the transaction needs to be synchronous, then force the
981 * log out now and wait for it.
982 */
983 if (sync) {
984 error = xfs_log_force_lsn(mp, commit_lsn, XFS_LOG_SYNC, NULL);
985 XFS_STATS_INC(mp, xs_trans_sync);
986 } else {
987 XFS_STATS_INC(mp, xs_trans_async);
988 }
989
990 return error;
991
992out_unreserve:
993 xfs_trans_unreserve_and_mod_sb(tp);
994
995 /*
996 * It is indeed possible for the transaction to be not dirty but
997 * the dqinfo portion to be. All that means is that we have some
998 * (non-persistent) quota reservations that need to be unreserved.
999 */
1000 xfs_trans_unreserve_and_mod_dquots(tp);
1001 if (tp->t_ticket) {
1002 commit_lsn = xfs_log_done(mp, tp->t_ticket, NULL, regrant);
1003 if (commit_lsn == -1 && !error)
1004 error = -EIO;
1005 tp->t_ticket = NULL;
1006 }
1007 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
1008 xfs_trans_free_items(tp, !!error);
1009 xfs_trans_free(tp);
1010
1011 XFS_STATS_INC(mp, xs_trans_empty);
1012 return error;
1013}
1014
1015int
1016xfs_trans_commit(
1017 struct xfs_trans *tp)
1018{
1019 return __xfs_trans_commit(tp, false);
1020}
1021
1022/*
1023 * Unlock all of the transaction's items and free the transaction.
1024 * The transaction must not have modified any of its items, because
1025 * there is no way to restore them to their previous state.
1026 *
1027 * If the transaction has made a log reservation, make sure to release
1028 * it as well.
1029 */
1030void
1031xfs_trans_cancel(
1032 struct xfs_trans *tp)
1033{
1034 struct xfs_mount *mp = tp->t_mountp;
1035 bool dirty = (tp->t_flags & XFS_TRANS_DIRTY);
1036
1037 trace_xfs_trans_cancel(tp, _RET_IP_);
1038
1039 if (tp->t_flags & XFS_TRANS_PERM_LOG_RES)
1040 xfs_defer_cancel(tp);
1041
1042 /*
1043 * See if the caller is relying on us to shut down the
1044 * filesystem. This happens in paths where we detect
1045 * corruption and decide to give up.
1046 */
1047 if (dirty && !XFS_FORCED_SHUTDOWN(mp)) {
1048 XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
1049 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1050 }
1051#ifdef DEBUG
1052 if (!dirty && !XFS_FORCED_SHUTDOWN(mp)) {
1053 struct xfs_log_item *lip;
1054
1055 list_for_each_entry(lip, &tp->t_items, li_trans)
1056 ASSERT(!(lip->li_type == XFS_LI_EFD));
1057 }
1058#endif
1059 xfs_trans_unreserve_and_mod_sb(tp);
1060 xfs_trans_unreserve_and_mod_dquots(tp);
1061
1062 if (tp->t_ticket) {
1063 xfs_log_done(mp, tp->t_ticket, NULL, false);
1064 tp->t_ticket = NULL;
1065 }
1066
1067 /* mark this thread as no longer being in a transaction */
1068 current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
1069
1070 xfs_trans_free_items(tp, dirty);
1071 xfs_trans_free(tp);
1072}
1073
1074/*
1075 * Roll from one trans in the sequence of PERMANENT transactions to
1076 * the next: permanent transactions are only flushed out when
1077 * committed with xfs_trans_commit(), but we still want as soon
1078 * as possible to let chunks of it go to the log. So we commit the
1079 * chunk we've been working on and get a new transaction to continue.
1080 */
1081int
1082xfs_trans_roll(
1083 struct xfs_trans **tpp)
1084{
1085 struct xfs_trans *trans = *tpp;
1086 struct xfs_trans_res tres;
1087 int error;
1088
1089 trace_xfs_trans_roll(trans, _RET_IP_);
1090
1091 /*
1092 * Copy the critical parameters from one trans to the next.
1093 */
1094 tres.tr_logres = trans->t_log_res;
1095 tres.tr_logcount = trans->t_log_count;
1096
1097 *tpp = xfs_trans_dup(trans);
1098
1099 /*
1100 * Commit the current transaction.
1101 * If this commit failed, then it'd just unlock those items that
1102 * are not marked ihold. That also means that a filesystem shutdown
1103 * is in progress. The caller takes the responsibility to cancel
1104 * the duplicate transaction that gets returned.
1105 */
1106 error = __xfs_trans_commit(trans, true);
1107 if (error)
1108 return error;
1109
1110 /*
1111 * Reserve space in the log for the next transaction.
1112 * This also pushes items in the "AIL", the list of logged items,
1113 * out to disk if they are taking up space at the tail of the log
1114 * that we want to use. This requires that either nothing be locked
1115 * across this call, or that anything that is locked be logged in
1116 * the prior and the next transactions.
1117 */
1118 tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
1119 return xfs_trans_reserve(*tpp, &tres, 0, 0);
1120}