Merge tag 'xtensa-20180225' of git://github.com/jcmvbkbc/linux-xtensa
[cris-mirror.git] / fs / xfs / xfs_dquot_item.c
blob96eaa693370926a7550fd7a505130aa2f343dbc3
1 /*
2 * Copyright (c) 2000-2003 Silicon Graphics, Inc.
3 * All Rights Reserved.
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.
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.
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
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_format.h"
21 #include "xfs_log_format.h"
22 #include "xfs_trans_resv.h"
23 #include "xfs_mount.h"
24 #include "xfs_inode.h"
25 #include "xfs_quota.h"
26 #include "xfs_error.h"
27 #include "xfs_trans.h"
28 #include "xfs_buf_item.h"
29 #include "xfs_trans_priv.h"
30 #include "xfs_qm.h"
31 #include "xfs_log.h"
33 static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
35 return container_of(lip, struct xfs_dq_logitem, qli_item);
39 * returns the number of iovecs needed to log the given dquot item.
41 STATIC void
42 xfs_qm_dquot_logitem_size(
43 struct xfs_log_item *lip,
44 int *nvecs,
45 int *nbytes)
47 *nvecs += 2;
48 *nbytes += sizeof(struct xfs_dq_logformat) +
49 sizeof(struct xfs_disk_dquot);
53 * fills in the vector of log iovecs for the given dquot log item.
55 STATIC void
56 xfs_qm_dquot_logitem_format(
57 struct xfs_log_item *lip,
58 struct xfs_log_vec *lv)
60 struct xfs_dq_logitem *qlip = DQUOT_ITEM(lip);
61 struct xfs_log_iovec *vecp = NULL;
62 struct xfs_dq_logformat *qlf;
64 qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QFORMAT);
65 qlf->qlf_type = XFS_LI_DQUOT;
66 qlf->qlf_size = 2;
67 qlf->qlf_id = be32_to_cpu(qlip->qli_dquot->q_core.d_id);
68 qlf->qlf_blkno = qlip->qli_dquot->q_blkno;
69 qlf->qlf_len = 1;
70 qlf->qlf_boffset = qlip->qli_dquot->q_bufoffset;
71 xlog_finish_iovec(lv, vecp, sizeof(struct xfs_dq_logformat));
73 xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_DQUOT,
74 &qlip->qli_dquot->q_core,
75 sizeof(struct xfs_disk_dquot));
79 * Increment the pin count of the given dquot.
81 STATIC void
82 xfs_qm_dquot_logitem_pin(
83 struct xfs_log_item *lip)
85 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
87 ASSERT(XFS_DQ_IS_LOCKED(dqp));
88 atomic_inc(&dqp->q_pincount);
92 * Decrement the pin count of the given dquot, and wake up
93 * anyone in xfs_dqwait_unpin() if the count goes to 0. The
94 * dquot must have been previously pinned with a call to
95 * xfs_qm_dquot_logitem_pin().
97 STATIC void
98 xfs_qm_dquot_logitem_unpin(
99 struct xfs_log_item *lip,
100 int remove)
102 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
104 ASSERT(atomic_read(&dqp->q_pincount) > 0);
105 if (atomic_dec_and_test(&dqp->q_pincount))
106 wake_up(&dqp->q_pinwait);
109 STATIC xfs_lsn_t
110 xfs_qm_dquot_logitem_committed(
111 struct xfs_log_item *lip,
112 xfs_lsn_t lsn)
115 * We always re-log the entire dquot when it becomes dirty,
116 * so, the latest copy _is_ the only one that matters.
118 return lsn;
122 * This is called to wait for the given dquot to be unpinned.
123 * Most of these pin/unpin routines are plagiarized from inode code.
125 void
126 xfs_qm_dqunpin_wait(
127 struct xfs_dquot *dqp)
129 ASSERT(XFS_DQ_IS_LOCKED(dqp));
130 if (atomic_read(&dqp->q_pincount) == 0)
131 return;
134 * Give the log a push so we don't wait here too long.
136 xfs_log_force(dqp->q_mount, 0);
137 wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
141 * Callback used to mark a buffer with XFS_LI_FAILED when items in the buffer
142 * have been failed during writeback
144 * this informs the AIL that the dquot is already flush locked on the next push,
145 * and acquires a hold on the buffer to ensure that it isn't reclaimed before
146 * dirty data makes it to disk.
148 STATIC void
149 xfs_dquot_item_error(
150 struct xfs_log_item *lip,
151 struct xfs_buf *bp)
153 ASSERT(!completion_done(&DQUOT_ITEM(lip)->qli_dquot->q_flush));
154 xfs_set_li_failed(lip, bp);
157 STATIC uint
158 xfs_qm_dquot_logitem_push(
159 struct xfs_log_item *lip,
160 struct list_head *buffer_list) __releases(&lip->li_ailp->xa_lock)
161 __acquires(&lip->li_ailp->xa_lock)
163 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
164 struct xfs_buf *bp = lip->li_buf;
165 uint rval = XFS_ITEM_SUCCESS;
166 int error;
168 if (atomic_read(&dqp->q_pincount) > 0)
169 return XFS_ITEM_PINNED;
172 * The buffer containing this item failed to be written back
173 * previously. Resubmit the buffer for IO
175 if (lip->li_flags & XFS_LI_FAILED) {
176 if (!xfs_buf_trylock(bp))
177 return XFS_ITEM_LOCKED;
179 if (!xfs_buf_resubmit_failed_buffers(bp, buffer_list))
180 rval = XFS_ITEM_FLUSHING;
182 xfs_buf_unlock(bp);
183 return rval;
186 if (!xfs_dqlock_nowait(dqp))
187 return XFS_ITEM_LOCKED;
190 * Re-check the pincount now that we stabilized the value by
191 * taking the quota lock.
193 if (atomic_read(&dqp->q_pincount) > 0) {
194 rval = XFS_ITEM_PINNED;
195 goto out_unlock;
199 * Someone else is already flushing the dquot. Nothing we can do
200 * here but wait for the flush to finish and remove the item from
201 * the AIL.
203 if (!xfs_dqflock_nowait(dqp)) {
204 rval = XFS_ITEM_FLUSHING;
205 goto out_unlock;
208 spin_unlock(&lip->li_ailp->xa_lock);
210 error = xfs_qm_dqflush(dqp, &bp);
211 if (error) {
212 xfs_warn(dqp->q_mount, "%s: push error %d on dqp "PTR_FMT,
213 __func__, error, dqp);
214 } else {
215 if (!xfs_buf_delwri_queue(bp, buffer_list))
216 rval = XFS_ITEM_FLUSHING;
217 xfs_buf_relse(bp);
220 spin_lock(&lip->li_ailp->xa_lock);
221 out_unlock:
222 xfs_dqunlock(dqp);
223 return rval;
227 * Unlock the dquot associated with the log item.
228 * Clear the fields of the dquot and dquot log item that
229 * are specific to the current transaction. If the
230 * hold flags is set, do not unlock the dquot.
232 STATIC void
233 xfs_qm_dquot_logitem_unlock(
234 struct xfs_log_item *lip)
236 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
238 ASSERT(XFS_DQ_IS_LOCKED(dqp));
241 * Clear the transaction pointer in the dquot
243 dqp->q_transp = NULL;
246 * dquots are never 'held' from getting unlocked at the end of
247 * a transaction. Their locking and unlocking is hidden inside the
248 * transaction layer, within trans_commit. Hence, no LI_HOLD flag
249 * for the logitem.
251 xfs_dqunlock(dqp);
255 * this needs to stamp an lsn into the dquot, I think.
256 * rpc's that look at user dquot's would then have to
257 * push on the dependency recorded in the dquot
259 STATIC void
260 xfs_qm_dquot_logitem_committing(
261 struct xfs_log_item *lip,
262 xfs_lsn_t lsn)
267 * This is the ops vector for dquots
269 static const struct xfs_item_ops xfs_dquot_item_ops = {
270 .iop_size = xfs_qm_dquot_logitem_size,
271 .iop_format = xfs_qm_dquot_logitem_format,
272 .iop_pin = xfs_qm_dquot_logitem_pin,
273 .iop_unpin = xfs_qm_dquot_logitem_unpin,
274 .iop_unlock = xfs_qm_dquot_logitem_unlock,
275 .iop_committed = xfs_qm_dquot_logitem_committed,
276 .iop_push = xfs_qm_dquot_logitem_push,
277 .iop_committing = xfs_qm_dquot_logitem_committing,
278 .iop_error = xfs_dquot_item_error
282 * Initialize the dquot log item for a newly allocated dquot.
283 * The dquot isn't locked at this point, but it isn't on any of the lists
284 * either, so we don't care.
286 void
287 xfs_qm_dquot_logitem_init(
288 struct xfs_dquot *dqp)
290 struct xfs_dq_logitem *lp = &dqp->q_logitem;
292 xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
293 &xfs_dquot_item_ops);
294 lp->qli_dquot = dqp;
297 /*------------------ QUOTAOFF LOG ITEMS -------------------*/
299 static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
301 return container_of(lip, struct xfs_qoff_logitem, qql_item);
306 * This returns the number of iovecs needed to log the given quotaoff item.
307 * We only need 1 iovec for an quotaoff item. It just logs the
308 * quotaoff_log_format structure.
310 STATIC void
311 xfs_qm_qoff_logitem_size(
312 struct xfs_log_item *lip,
313 int *nvecs,
314 int *nbytes)
316 *nvecs += 1;
317 *nbytes += sizeof(struct xfs_qoff_logitem);
320 STATIC void
321 xfs_qm_qoff_logitem_format(
322 struct xfs_log_item *lip,
323 struct xfs_log_vec *lv)
325 struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip);
326 struct xfs_log_iovec *vecp = NULL;
327 struct xfs_qoff_logformat *qlf;
329 qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QUOTAOFF);
330 qlf->qf_type = XFS_LI_QUOTAOFF;
331 qlf->qf_size = 1;
332 qlf->qf_flags = qflip->qql_flags;
333 xlog_finish_iovec(lv, vecp, sizeof(struct xfs_qoff_logitem));
337 * Pinning has no meaning for an quotaoff item, so just return.
339 STATIC void
340 xfs_qm_qoff_logitem_pin(
341 struct xfs_log_item *lip)
346 * Since pinning has no meaning for an quotaoff item, unpinning does
347 * not either.
349 STATIC void
350 xfs_qm_qoff_logitem_unpin(
351 struct xfs_log_item *lip,
352 int remove)
357 * There isn't much you can do to push a quotaoff item. It is simply
358 * stuck waiting for the log to be flushed to disk.
360 STATIC uint
361 xfs_qm_qoff_logitem_push(
362 struct xfs_log_item *lip,
363 struct list_head *buffer_list)
365 return XFS_ITEM_LOCKED;
369 * Quotaoff items have no locking or pushing, so return failure
370 * so that the caller doesn't bother with us.
372 STATIC void
373 xfs_qm_qoff_logitem_unlock(
374 struct xfs_log_item *lip)
379 * The quotaoff-start-item is logged only once and cannot be moved in the log,
380 * so simply return the lsn at which it's been logged.
382 STATIC xfs_lsn_t
383 xfs_qm_qoff_logitem_committed(
384 struct xfs_log_item *lip,
385 xfs_lsn_t lsn)
387 return lsn;
390 STATIC xfs_lsn_t
391 xfs_qm_qoffend_logitem_committed(
392 struct xfs_log_item *lip,
393 xfs_lsn_t lsn)
395 struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip);
396 struct xfs_qoff_logitem *qfs = qfe->qql_start_lip;
397 struct xfs_ail *ailp = qfs->qql_item.li_ailp;
400 * Delete the qoff-start logitem from the AIL.
401 * xfs_trans_ail_delete() drops the AIL lock.
403 spin_lock(&ailp->xa_lock);
404 xfs_trans_ail_delete(ailp, &qfs->qql_item, SHUTDOWN_LOG_IO_ERROR);
406 kmem_free(qfs->qql_item.li_lv_shadow);
407 kmem_free(lip->li_lv_shadow);
408 kmem_free(qfs);
409 kmem_free(qfe);
410 return (xfs_lsn_t)-1;
414 * XXX rcc - don't know quite what to do with this. I think we can
415 * just ignore it. The only time that isn't the case is if we allow
416 * the client to somehow see that quotas have been turned off in which
417 * we can't allow that to get back until the quotaoff hits the disk.
418 * So how would that happen? Also, do we need different routines for
419 * quotaoff start and quotaoff end? I suspect the answer is yes but
420 * to be sure, I need to look at the recovery code and see how quota off
421 * recovery is handled (do we roll forward or back or do something else).
422 * If we roll forwards or backwards, then we need two separate routines,
423 * one that does nothing and one that stamps in the lsn that matters
424 * (truly makes the quotaoff irrevocable). If we do something else,
425 * then maybe we don't need two.
427 STATIC void
428 xfs_qm_qoff_logitem_committing(
429 struct xfs_log_item *lip,
430 xfs_lsn_t commit_lsn)
434 static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
435 .iop_size = xfs_qm_qoff_logitem_size,
436 .iop_format = xfs_qm_qoff_logitem_format,
437 .iop_pin = xfs_qm_qoff_logitem_pin,
438 .iop_unpin = xfs_qm_qoff_logitem_unpin,
439 .iop_unlock = xfs_qm_qoff_logitem_unlock,
440 .iop_committed = xfs_qm_qoffend_logitem_committed,
441 .iop_push = xfs_qm_qoff_logitem_push,
442 .iop_committing = xfs_qm_qoff_logitem_committing
446 * This is the ops vector shared by all quotaoff-start log items.
448 static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
449 .iop_size = xfs_qm_qoff_logitem_size,
450 .iop_format = xfs_qm_qoff_logitem_format,
451 .iop_pin = xfs_qm_qoff_logitem_pin,
452 .iop_unpin = xfs_qm_qoff_logitem_unpin,
453 .iop_unlock = xfs_qm_qoff_logitem_unlock,
454 .iop_committed = xfs_qm_qoff_logitem_committed,
455 .iop_push = xfs_qm_qoff_logitem_push,
456 .iop_committing = xfs_qm_qoff_logitem_committing
460 * Allocate and initialize an quotaoff item of the correct quota type(s).
462 struct xfs_qoff_logitem *
463 xfs_qm_qoff_logitem_init(
464 struct xfs_mount *mp,
465 struct xfs_qoff_logitem *start,
466 uint flags)
468 struct xfs_qoff_logitem *qf;
470 qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), KM_SLEEP);
472 xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ?
473 &xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops);
474 qf->qql_item.li_mountp = mp;
475 qf->qql_start_lip = start;
476 qf->qql_flags = flags;
477 return qf;