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1/*
2 * Copyright (c) 2000-2003 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_bit.h"
21#include "xfs_log.h"
22#include "xfs_inum.h"
23#include "xfs_trans.h"
24#include "xfs_sb.h"
25#include "xfs_ag.h"
26#include "xfs_alloc.h"
27#include "xfs_quota.h"
28#include "xfs_mount.h"
29#include "xfs_bmap_btree.h"
30#include "xfs_inode.h"
31#include "xfs_bmap.h"
32#include "xfs_rtalloc.h"
33#include "xfs_error.h"
34#include "xfs_itable.h"
35#include "xfs_attr.h"
36#include "xfs_buf_item.h"
37#include "xfs_trans_priv.h"
38#include "xfs_qm.h"
39
40static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
41{
42 return container_of(lip, struct xfs_dq_logitem, qli_item);
43}
44
45/*
46 * returns the number of iovecs needed to log the given dquot item.
47 */
48STATIC uint
49xfs_qm_dquot_logitem_size(
50 struct xfs_log_item *lip)
51{
52 /*
53 * we need only two iovecs, one for the format, one for the real thing
54 */
55 return 2;
56}
57
58/*
59 * fills in the vector of log iovecs for the given dquot log item.
60 */
61STATIC void
62xfs_qm_dquot_logitem_format(
63 struct xfs_log_item *lip,
64 struct xfs_log_iovec *logvec)
65{
66 struct xfs_dq_logitem *qlip = DQUOT_ITEM(lip);
67
68 logvec->i_addr = &qlip->qli_format;
69 logvec->i_len = sizeof(xfs_dq_logformat_t);
70 logvec->i_type = XLOG_REG_TYPE_QFORMAT;
71 logvec++;
72 logvec->i_addr = &qlip->qli_dquot->q_core;
73 logvec->i_len = sizeof(xfs_disk_dquot_t);
74 logvec->i_type = XLOG_REG_TYPE_DQUOT;
75
76 ASSERT(2 == lip->li_desc->lid_size);
77 qlip->qli_format.qlf_size = 2;
78
79}
80
81/*
82 * Increment the pin count of the given dquot.
83 */
84STATIC void
85xfs_qm_dquot_logitem_pin(
86 struct xfs_log_item *lip)
87{
88 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
89
90 ASSERT(XFS_DQ_IS_LOCKED(dqp));
91 atomic_inc(&dqp->q_pincount);
92}
93
94/*
95 * Decrement the pin count of the given dquot, and wake up
96 * anyone in xfs_dqwait_unpin() if the count goes to 0. The
97 * dquot must have been previously pinned with a call to
98 * xfs_qm_dquot_logitem_pin().
99 */
100STATIC void
101xfs_qm_dquot_logitem_unpin(
102 struct xfs_log_item *lip,
103 int remove)
104{
105 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
106
107 ASSERT(atomic_read(&dqp->q_pincount) > 0);
108 if (atomic_dec_and_test(&dqp->q_pincount))
109 wake_up(&dqp->q_pinwait);
110}
111
112/*
113 * Given the logitem, this writes the corresponding dquot entry to disk
114 * asynchronously. This is called with the dquot entry securely locked;
115 * we simply get xfs_qm_dqflush() to do the work, and unlock the dquot
116 * at the end.
117 */
118STATIC void
119xfs_qm_dquot_logitem_push(
120 struct xfs_log_item *lip)
121{
122 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
123 int error;
124
125 ASSERT(XFS_DQ_IS_LOCKED(dqp));
126 ASSERT(!completion_done(&dqp->q_flush));
127
128 /*
129 * Since we were able to lock the dquot's flush lock and
130 * we found it on the AIL, the dquot must be dirty. This
131 * is because the dquot is removed from the AIL while still
132 * holding the flush lock in xfs_dqflush_done(). Thus, if
133 * we found it in the AIL and were able to obtain the flush
134 * lock without sleeping, then there must not have been
135 * anyone in the process of flushing the dquot.
136 */
137 error = xfs_qm_dqflush(dqp, 0);
138 if (error)
139 xfs_warn(dqp->q_mount, "%s: push error %d on dqp %p",
140 __func__, error, dqp);
141 xfs_dqunlock(dqp);
142}
143
144STATIC xfs_lsn_t
145xfs_qm_dquot_logitem_committed(
146 struct xfs_log_item *lip,
147 xfs_lsn_t lsn)
148{
149 /*
150 * We always re-log the entire dquot when it becomes dirty,
151 * so, the latest copy _is_ the only one that matters.
152 */
153 return lsn;
154}
155
156/*
157 * This is called to wait for the given dquot to be unpinned.
158 * Most of these pin/unpin routines are plagiarized from inode code.
159 */
160void
161xfs_qm_dqunpin_wait(
162 struct xfs_dquot *dqp)
163{
164 ASSERT(XFS_DQ_IS_LOCKED(dqp));
165 if (atomic_read(&dqp->q_pincount) == 0)
166 return;
167
168 /*
169 * Give the log a push so we don't wait here too long.
170 */
171 xfs_log_force(dqp->q_mount, 0);
172 wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
173}
174
175/*
176 * This is called when IOP_TRYLOCK returns XFS_ITEM_PUSHBUF to indicate that
177 * the dquot is locked by us, but the flush lock isn't. So, here we are
178 * going to see if the relevant dquot buffer is incore, waiting on DELWRI.
179 * If so, we want to push it out to help us take this item off the AIL as soon
180 * as possible.
181 *
182 * We must not be holding the AIL lock at this point. Calling incore() to
183 * search the buffer cache can be a time consuming thing, and AIL lock is a
184 * spinlock.
185 */
186STATIC bool
187xfs_qm_dquot_logitem_pushbuf(
188 struct xfs_log_item *lip)
189{
190 struct xfs_dq_logitem *qlip = DQUOT_ITEM(lip);
191 struct xfs_dquot *dqp = qlip->qli_dquot;
192 struct xfs_buf *bp;
193 bool ret = true;
194
195 ASSERT(XFS_DQ_IS_LOCKED(dqp));
196
197 /*
198 * If flushlock isn't locked anymore, chances are that the
199 * inode flush completed and the inode was taken off the AIL.
200 * So, just get out.
201 */
202 if (completion_done(&dqp->q_flush) ||
203 !(lip->li_flags & XFS_LI_IN_AIL)) {
204 xfs_dqunlock(dqp);
205 return true;
206 }
207
208 bp = xfs_incore(dqp->q_mount->m_ddev_targp, qlip->qli_format.qlf_blkno,
209 dqp->q_mount->m_quotainfo->qi_dqchunklen, XBF_TRYLOCK);
210 xfs_dqunlock(dqp);
211 if (!bp)
212 return true;
213 if (XFS_BUF_ISDELAYWRITE(bp))
214 xfs_buf_delwri_promote(bp);
215 if (xfs_buf_ispinned(bp))
216 ret = false;
217 xfs_buf_relse(bp);
218 return ret;
219}
220
221/*
222 * This is called to attempt to lock the dquot associated with this
223 * dquot log item. Don't sleep on the dquot lock or the flush lock.
224 * If the flush lock is already held, indicating that the dquot has
225 * been or is in the process of being flushed, then see if we can
226 * find the dquot's buffer in the buffer cache without sleeping. If
227 * we can and it is marked delayed write, then we want to send it out.
228 * We delay doing so until the push routine, though, to avoid sleeping
229 * in any device strategy routines.
230 */
231STATIC uint
232xfs_qm_dquot_logitem_trylock(
233 struct xfs_log_item *lip)
234{
235 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
236
237 if (atomic_read(&dqp->q_pincount) > 0)
238 return XFS_ITEM_PINNED;
239
240 if (!xfs_qm_dqlock_nowait(dqp))
241 return XFS_ITEM_LOCKED;
242
243 if (!xfs_dqflock_nowait(dqp)) {
244 /*
245 * dquot has already been flushed to the backing buffer,
246 * leave it locked, pushbuf routine will unlock it.
247 */
248 return XFS_ITEM_PUSHBUF;
249 }
250
251 ASSERT(lip->li_flags & XFS_LI_IN_AIL);
252 return XFS_ITEM_SUCCESS;
253}
254
255/*
256 * Unlock the dquot associated with the log item.
257 * Clear the fields of the dquot and dquot log item that
258 * are specific to the current transaction. If the
259 * hold flags is set, do not unlock the dquot.
260 */
261STATIC void
262xfs_qm_dquot_logitem_unlock(
263 struct xfs_log_item *lip)
264{
265 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
266
267 ASSERT(XFS_DQ_IS_LOCKED(dqp));
268
269 /*
270 * Clear the transaction pointer in the dquot
271 */
272 dqp->q_transp = NULL;
273
274 /*
275 * dquots are never 'held' from getting unlocked at the end of
276 * a transaction. Their locking and unlocking is hidden inside the
277 * transaction layer, within trans_commit. Hence, no LI_HOLD flag
278 * for the logitem.
279 */
280 xfs_dqunlock(dqp);
281}
282
283/*
284 * this needs to stamp an lsn into the dquot, I think.
285 * rpc's that look at user dquot's would then have to
286 * push on the dependency recorded in the dquot
287 */
288STATIC void
289xfs_qm_dquot_logitem_committing(
290 struct xfs_log_item *lip,
291 xfs_lsn_t lsn)
292{
293}
294
295/*
296 * This is the ops vector for dquots
297 */
298static struct xfs_item_ops xfs_dquot_item_ops = {
299 .iop_size = xfs_qm_dquot_logitem_size,
300 .iop_format = xfs_qm_dquot_logitem_format,
301 .iop_pin = xfs_qm_dquot_logitem_pin,
302 .iop_unpin = xfs_qm_dquot_logitem_unpin,
303 .iop_trylock = xfs_qm_dquot_logitem_trylock,
304 .iop_unlock = xfs_qm_dquot_logitem_unlock,
305 .iop_committed = xfs_qm_dquot_logitem_committed,
306 .iop_push = xfs_qm_dquot_logitem_push,
307 .iop_pushbuf = xfs_qm_dquot_logitem_pushbuf,
308 .iop_committing = xfs_qm_dquot_logitem_committing
309};
310
311/*
312 * Initialize the dquot log item for a newly allocated dquot.
313 * The dquot isn't locked at this point, but it isn't on any of the lists
314 * either, so we don't care.
315 */
316void
317xfs_qm_dquot_logitem_init(
318 struct xfs_dquot *dqp)
319{
320 struct xfs_dq_logitem *lp = &dqp->q_logitem;
321
322 xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
323 &xfs_dquot_item_ops);
324 lp->qli_dquot = dqp;
325 lp->qli_format.qlf_type = XFS_LI_DQUOT;
326 lp->qli_format.qlf_id = be32_to_cpu(dqp->q_core.d_id);
327 lp->qli_format.qlf_blkno = dqp->q_blkno;
328 lp->qli_format.qlf_len = 1;
329 /*
330 * This is just the offset of this dquot within its buffer
331 * (which is currently 1 FSB and probably won't change).
332 * Hence 32 bits for this offset should be just fine.
333 * Alternatively, we can store (bufoffset / sizeof(xfs_dqblk_t))
334 * here, and recompute it at recovery time.
335 */
336 lp->qli_format.qlf_boffset = (__uint32_t)dqp->q_bufoffset;
337}
338
339/*------------------ QUOTAOFF LOG ITEMS -------------------*/
340
341static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
342{
343 return container_of(lip, struct xfs_qoff_logitem, qql_item);
344}
345
346
347/*
348 * This returns the number of iovecs needed to log the given quotaoff item.
349 * We only need 1 iovec for an quotaoff item. It just logs the
350 * quotaoff_log_format structure.
351 */
352STATIC uint
353xfs_qm_qoff_logitem_size(
354 struct xfs_log_item *lip)
355{
356 return 1;
357}
358
359/*
360 * This is called to fill in the vector of log iovecs for the
361 * given quotaoff log item. We use only 1 iovec, and we point that
362 * at the quotaoff_log_format structure embedded in the quotaoff item.
363 * It is at this point that we assert that all of the extent
364 * slots in the quotaoff item have been filled.
365 */
366STATIC void
367xfs_qm_qoff_logitem_format(
368 struct xfs_log_item *lip,
369 struct xfs_log_iovec *log_vector)
370{
371 struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip);
372
373 ASSERT(qflip->qql_format.qf_type == XFS_LI_QUOTAOFF);
374
375 log_vector->i_addr = &qflip->qql_format;
376 log_vector->i_len = sizeof(xfs_qoff_logitem_t);
377 log_vector->i_type = XLOG_REG_TYPE_QUOTAOFF;
378 qflip->qql_format.qf_size = 1;
379}
380
381/*
382 * Pinning has no meaning for an quotaoff item, so just return.
383 */
384STATIC void
385xfs_qm_qoff_logitem_pin(
386 struct xfs_log_item *lip)
387{
388}
389
390/*
391 * Since pinning has no meaning for an quotaoff item, unpinning does
392 * not either.
393 */
394STATIC void
395xfs_qm_qoff_logitem_unpin(
396 struct xfs_log_item *lip,
397 int remove)
398{
399}
400
401/*
402 * Quotaoff items have no locking, so just return success.
403 */
404STATIC uint
405xfs_qm_qoff_logitem_trylock(
406 struct xfs_log_item *lip)
407{
408 return XFS_ITEM_LOCKED;
409}
410
411/*
412 * Quotaoff items have no locking or pushing, so return failure
413 * so that the caller doesn't bother with us.
414 */
415STATIC void
416xfs_qm_qoff_logitem_unlock(
417 struct xfs_log_item *lip)
418{
419}
420
421/*
422 * The quotaoff-start-item is logged only once and cannot be moved in the log,
423 * so simply return the lsn at which it's been logged.
424 */
425STATIC xfs_lsn_t
426xfs_qm_qoff_logitem_committed(
427 struct xfs_log_item *lip,
428 xfs_lsn_t lsn)
429{
430 return lsn;
431}
432
433/*
434 * There isn't much you can do to push on an quotaoff item. It is simply
435 * stuck waiting for the log to be flushed to disk.
436 */
437STATIC void
438xfs_qm_qoff_logitem_push(
439 struct xfs_log_item *lip)
440{
441}
442
443
444STATIC xfs_lsn_t
445xfs_qm_qoffend_logitem_committed(
446 struct xfs_log_item *lip,
447 xfs_lsn_t lsn)
448{
449 struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip);
450 struct xfs_qoff_logitem *qfs = qfe->qql_start_lip;
451 struct xfs_ail *ailp = qfs->qql_item.li_ailp;
452
453 /*
454 * Delete the qoff-start logitem from the AIL.
455 * xfs_trans_ail_delete() drops the AIL lock.
456 */
457 spin_lock(&ailp->xa_lock);
458 xfs_trans_ail_delete(ailp, (xfs_log_item_t *)qfs);
459
460 kmem_free(qfs);
461 kmem_free(qfe);
462 return (xfs_lsn_t)-1;
463}
464
465/*
466 * XXX rcc - don't know quite what to do with this. I think we can
467 * just ignore it. The only time that isn't the case is if we allow
468 * the client to somehow see that quotas have been turned off in which
469 * we can't allow that to get back until the quotaoff hits the disk.
470 * So how would that happen? Also, do we need different routines for
471 * quotaoff start and quotaoff end? I suspect the answer is yes but
472 * to be sure, I need to look at the recovery code and see how quota off
473 * recovery is handled (do we roll forward or back or do something else).
474 * If we roll forwards or backwards, then we need two separate routines,
475 * one that does nothing and one that stamps in the lsn that matters
476 * (truly makes the quotaoff irrevocable). If we do something else,
477 * then maybe we don't need two.
478 */
479STATIC void
480xfs_qm_qoff_logitem_committing(
481 struct xfs_log_item *lip,
482 xfs_lsn_t commit_lsn)
483{
484}
485
486static struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
487 .iop_size = xfs_qm_qoff_logitem_size,
488 .iop_format = xfs_qm_qoff_logitem_format,
489 .iop_pin = xfs_qm_qoff_logitem_pin,
490 .iop_unpin = xfs_qm_qoff_logitem_unpin,
491 .iop_trylock = xfs_qm_qoff_logitem_trylock,
492 .iop_unlock = xfs_qm_qoff_logitem_unlock,
493 .iop_committed = xfs_qm_qoffend_logitem_committed,
494 .iop_push = xfs_qm_qoff_logitem_push,
495 .iop_committing = xfs_qm_qoff_logitem_committing
496};
497
498/*
499 * This is the ops vector shared by all quotaoff-start log items.
500 */
501static struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
502 .iop_size = xfs_qm_qoff_logitem_size,
503 .iop_format = xfs_qm_qoff_logitem_format,
504 .iop_pin = xfs_qm_qoff_logitem_pin,
505 .iop_unpin = xfs_qm_qoff_logitem_unpin,
506 .iop_trylock = xfs_qm_qoff_logitem_trylock,
507 .iop_unlock = xfs_qm_qoff_logitem_unlock,
508 .iop_committed = xfs_qm_qoff_logitem_committed,
509 .iop_push = xfs_qm_qoff_logitem_push,
510 .iop_committing = xfs_qm_qoff_logitem_committing
511};
512
513/*
514 * Allocate and initialize an quotaoff item of the correct quota type(s).
515 */
516struct xfs_qoff_logitem *
517xfs_qm_qoff_logitem_init(
518 struct xfs_mount *mp,
519 struct xfs_qoff_logitem *start,
520 uint flags)
521{
522 struct xfs_qoff_logitem *qf;
523
524 qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), KM_SLEEP);
525
526 xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ?
527 &xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops);
528 qf->qql_item.li_mountp = mp;
529 qf->qql_format.qf_type = XFS_LI_QUOTAOFF;
530 qf->qql_format.qf_flags = flags;
531 qf->qql_start_lip = start;
532 return qf;
533}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2003 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
12#include "xfs_mount.h"
13#include "xfs_inode.h"
14#include "xfs_quota.h"
15#include "xfs_trans.h"
16#include "xfs_buf_item.h"
17#include "xfs_trans_priv.h"
18#include "xfs_qm.h"
19#include "xfs_log.h"
20#include "xfs_error.h"
21
22static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
23{
24 return container_of(lip, struct xfs_dq_logitem, qli_item);
25}
26
27/*
28 * returns the number of iovecs needed to log the given dquot item.
29 */
30STATIC void
31xfs_qm_dquot_logitem_size(
32 struct xfs_log_item *lip,
33 int *nvecs,
34 int *nbytes)
35{
36 *nvecs += 2;
37 *nbytes += sizeof(struct xfs_dq_logformat) +
38 sizeof(struct xfs_disk_dquot);
39}
40
41/*
42 * fills in the vector of log iovecs for the given dquot log item.
43 */
44STATIC void
45xfs_qm_dquot_logitem_format(
46 struct xfs_log_item *lip,
47 struct xfs_log_vec *lv)
48{
49 struct xfs_disk_dquot ddq;
50 struct xfs_dq_logitem *qlip = DQUOT_ITEM(lip);
51 struct xfs_log_iovec *vecp = NULL;
52 struct xfs_dq_logformat *qlf;
53
54 qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QFORMAT);
55 qlf->qlf_type = XFS_LI_DQUOT;
56 qlf->qlf_size = 2;
57 qlf->qlf_id = qlip->qli_dquot->q_id;
58 qlf->qlf_blkno = qlip->qli_dquot->q_blkno;
59 qlf->qlf_len = 1;
60 qlf->qlf_boffset = qlip->qli_dquot->q_bufoffset;
61 xlog_finish_iovec(lv, vecp, sizeof(struct xfs_dq_logformat));
62
63 xfs_dquot_to_disk(&ddq, qlip->qli_dquot);
64
65 xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_DQUOT, &ddq,
66 sizeof(struct xfs_disk_dquot));
67}
68
69/*
70 * Increment the pin count of the given dquot.
71 */
72STATIC void
73xfs_qm_dquot_logitem_pin(
74 struct xfs_log_item *lip)
75{
76 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
77
78 ASSERT(XFS_DQ_IS_LOCKED(dqp));
79 atomic_inc(&dqp->q_pincount);
80}
81
82/*
83 * Decrement the pin count of the given dquot, and wake up
84 * anyone in xfs_dqwait_unpin() if the count goes to 0. The
85 * dquot must have been previously pinned with a call to
86 * xfs_qm_dquot_logitem_pin().
87 */
88STATIC void
89xfs_qm_dquot_logitem_unpin(
90 struct xfs_log_item *lip,
91 int remove)
92{
93 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
94
95 ASSERT(atomic_read(&dqp->q_pincount) > 0);
96 if (atomic_dec_and_test(&dqp->q_pincount))
97 wake_up(&dqp->q_pinwait);
98}
99
100/*
101 * This is called to wait for the given dquot to be unpinned.
102 * Most of these pin/unpin routines are plagiarized from inode code.
103 */
104void
105xfs_qm_dqunpin_wait(
106 struct xfs_dquot *dqp)
107{
108 ASSERT(XFS_DQ_IS_LOCKED(dqp));
109 if (atomic_read(&dqp->q_pincount) == 0)
110 return;
111
112 /*
113 * Give the log a push so we don't wait here too long.
114 */
115 xfs_log_force(dqp->q_mount, 0);
116 wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
117}
118
119STATIC uint
120xfs_qm_dquot_logitem_push(
121 struct xfs_log_item *lip,
122 struct list_head *buffer_list)
123 __releases(&lip->li_ailp->ail_lock)
124 __acquires(&lip->li_ailp->ail_lock)
125{
126 struct xfs_dq_logitem *qlip = DQUOT_ITEM(lip);
127 struct xfs_dquot *dqp = qlip->qli_dquot;
128 struct xfs_buf *bp;
129 uint rval = XFS_ITEM_SUCCESS;
130 int error;
131
132 if (atomic_read(&dqp->q_pincount) > 0)
133 return XFS_ITEM_PINNED;
134
135 if (!xfs_dqlock_nowait(dqp))
136 return XFS_ITEM_LOCKED;
137
138 /*
139 * Re-check the pincount now that we stabilized the value by
140 * taking the quota lock.
141 */
142 if (atomic_read(&dqp->q_pincount) > 0) {
143 rval = XFS_ITEM_PINNED;
144 goto out_unlock;
145 }
146
147 /*
148 * Someone else is already flushing the dquot. Nothing we can do
149 * here but wait for the flush to finish and remove the item from
150 * the AIL.
151 */
152 if (!xfs_dqflock_nowait(dqp)) {
153 rval = XFS_ITEM_FLUSHING;
154 goto out_unlock;
155 }
156
157 spin_unlock(&lip->li_ailp->ail_lock);
158
159 error = xfs_dquot_use_attached_buf(dqp, &bp);
160 if (error == -EAGAIN) {
161 xfs_dqfunlock(dqp);
162 rval = XFS_ITEM_LOCKED;
163 goto out_relock_ail;
164 }
165
166 /*
167 * dqflush completes dqflock on error, and the delwri ioend does it on
168 * success.
169 */
170 error = xfs_qm_dqflush(dqp, bp);
171 if (!error) {
172 if (!xfs_buf_delwri_queue(bp, buffer_list))
173 rval = XFS_ITEM_FLUSHING;
174 }
175 xfs_buf_relse(bp);
176
177out_relock_ail:
178 spin_lock(&lip->li_ailp->ail_lock);
179out_unlock:
180 xfs_dqunlock(dqp);
181 return rval;
182}
183
184STATIC void
185xfs_qm_dquot_logitem_release(
186 struct xfs_log_item *lip)
187{
188 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
189
190 ASSERT(XFS_DQ_IS_LOCKED(dqp));
191
192 /*
193 * dquots are never 'held' from getting unlocked at the end of
194 * a transaction. Their locking and unlocking is hidden inside the
195 * transaction layer, within trans_commit. Hence, no LI_HOLD flag
196 * for the logitem.
197 */
198 xfs_dqunlock(dqp);
199}
200
201STATIC void
202xfs_qm_dquot_logitem_committing(
203 struct xfs_log_item *lip,
204 xfs_csn_t seq)
205{
206 return xfs_qm_dquot_logitem_release(lip);
207}
208
209#ifdef DEBUG_EXPENSIVE
210static void
211xfs_qm_dquot_logitem_precommit_check(
212 struct xfs_dquot *dqp)
213{
214 struct xfs_mount *mp = dqp->q_mount;
215 struct xfs_disk_dquot ddq = { };
216 xfs_failaddr_t fa;
217
218 xfs_dquot_to_disk(&ddq, dqp);
219 fa = xfs_dquot_verify(mp, &ddq, dqp->q_id);
220 if (fa) {
221 XFS_CORRUPTION_ERROR("Bad dquot during logging",
222 XFS_ERRLEVEL_LOW, mp, &ddq, sizeof(ddq));
223 xfs_alert(mp,
224 "Metadata corruption detected at %pS, dquot 0x%x",
225 fa, dqp->q_id);
226 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
227 ASSERT(fa == NULL);
228 }
229}
230#else
231# define xfs_qm_dquot_logitem_precommit_check(...) ((void)0)
232#endif
233
234static int
235xfs_qm_dquot_logitem_precommit(
236 struct xfs_trans *tp,
237 struct xfs_log_item *lip)
238{
239 struct xfs_dq_logitem *qlip = DQUOT_ITEM(lip);
240 struct xfs_dquot *dqp = qlip->qli_dquot;
241
242 xfs_qm_dquot_logitem_precommit_check(dqp);
243
244 return xfs_dquot_attach_buf(tp, dqp);
245}
246
247static const struct xfs_item_ops xfs_dquot_item_ops = {
248 .iop_size = xfs_qm_dquot_logitem_size,
249 .iop_precommit = xfs_qm_dquot_logitem_precommit,
250 .iop_format = xfs_qm_dquot_logitem_format,
251 .iop_pin = xfs_qm_dquot_logitem_pin,
252 .iop_unpin = xfs_qm_dquot_logitem_unpin,
253 .iop_release = xfs_qm_dquot_logitem_release,
254 .iop_committing = xfs_qm_dquot_logitem_committing,
255 .iop_push = xfs_qm_dquot_logitem_push,
256};
257
258/*
259 * Initialize the dquot log item for a newly allocated dquot.
260 * The dquot isn't locked at this point, but it isn't on any of the lists
261 * either, so we don't care.
262 */
263void
264xfs_qm_dquot_logitem_init(
265 struct xfs_dquot *dqp)
266{
267 struct xfs_dq_logitem *lp = &dqp->q_logitem;
268
269 xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
270 &xfs_dquot_item_ops);
271 spin_lock_init(&lp->qli_lock);
272 lp->qli_dquot = dqp;
273 lp->qli_dirty = false;
274}