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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_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}
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}