2 * Copyright (c) 2000-2003 Silicon Graphics, Inc.
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
20 #include "xfs_format.h"
22 #include "xfs_trans.h"
25 #include "xfs_alloc.h"
26 #include "xfs_quota.h"
27 #include "xfs_mount.h"
28 #include "xfs_bmap_btree.h"
29 #include "xfs_inode.h"
31 #include "xfs_rtalloc.h"
32 #include "xfs_error.h"
33 #include "xfs_itable.h"
35 #include "xfs_buf_item.h"
36 #include "xfs_trans_priv.h"
39 static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
41 return container_of(lip, struct xfs_dq_logitem, qli_item);
45 * returns the number of iovecs needed to log the given dquot item.
48 xfs_qm_dquot_logitem_size(
49 struct xfs_log_item *lip)
52 * we need only two iovecs, one for the format, one for the real thing
58 * fills in the vector of log iovecs for the given dquot log item.
61 xfs_qm_dquot_logitem_format(
62 struct xfs_log_item *lip,
63 struct xfs_log_iovec *logvec)
65 struct xfs_dq_logitem *qlip = DQUOT_ITEM(lip);
67 logvec->i_addr = &qlip->qli_format;
68 logvec->i_len = sizeof(xfs_dq_logformat_t);
69 logvec->i_type = XLOG_REG_TYPE_QFORMAT;
71 logvec->i_addr = &qlip->qli_dquot->q_core;
72 logvec->i_len = sizeof(xfs_disk_dquot_t);
73 logvec->i_type = XLOG_REG_TYPE_DQUOT;
75 qlip->qli_format.qlf_size = 2;
80 * Increment the pin count of the given dquot.
83 xfs_qm_dquot_logitem_pin(
84 struct xfs_log_item *lip)
86 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
88 ASSERT(XFS_DQ_IS_LOCKED(dqp));
89 atomic_inc(&dqp->q_pincount);
93 * Decrement the pin count of the given dquot, and wake up
94 * anyone in xfs_dqwait_unpin() if the count goes to 0. The
95 * dquot must have been previously pinned with a call to
96 * xfs_qm_dquot_logitem_pin().
99 xfs_qm_dquot_logitem_unpin(
100 struct xfs_log_item *lip,
103 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
105 ASSERT(atomic_read(&dqp->q_pincount) > 0);
106 if (atomic_dec_and_test(&dqp->q_pincount))
107 wake_up(&dqp->q_pinwait);
111 xfs_qm_dquot_logitem_committed(
112 struct xfs_log_item *lip,
116 * We always re-log the entire dquot when it becomes dirty,
117 * so, the latest copy _is_ the only one that matters.
123 * This is called to wait for the given dquot to be unpinned.
124 * Most of these pin/unpin routines are plagiarized from inode code.
128 struct xfs_dquot *dqp)
130 ASSERT(XFS_DQ_IS_LOCKED(dqp));
131 if (atomic_read(&dqp->q_pincount) == 0)
135 * Give the log a push so we don't wait here too long.
137 xfs_log_force(dqp->q_mount, 0);
138 wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
142 xfs_qm_dquot_logitem_push(
143 struct xfs_log_item *lip,
144 struct list_head *buffer_list)
146 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
147 struct xfs_buf *bp = NULL;
148 uint rval = XFS_ITEM_SUCCESS;
151 if (atomic_read(&dqp->q_pincount) > 0)
152 return XFS_ITEM_PINNED;
154 if (!xfs_dqlock_nowait(dqp))
155 return XFS_ITEM_LOCKED;
158 * Re-check the pincount now that we stabilized the value by
159 * taking the quota lock.
161 if (atomic_read(&dqp->q_pincount) > 0) {
162 rval = XFS_ITEM_PINNED;
167 * Someone else is already flushing the dquot. Nothing we can do
168 * here but wait for the flush to finish and remove the item from
171 if (!xfs_dqflock_nowait(dqp)) {
172 rval = XFS_ITEM_FLUSHING;
176 spin_unlock(&lip->li_ailp->xa_lock);
178 error = xfs_qm_dqflush(dqp, &bp);
180 xfs_warn(dqp->q_mount, "%s: push error %d on dqp %p",
181 __func__, error, dqp);
183 if (!xfs_buf_delwri_queue(bp, buffer_list))
184 rval = XFS_ITEM_FLUSHING;
188 spin_lock(&lip->li_ailp->xa_lock);
195 * Unlock the dquot associated with the log item.
196 * Clear the fields of the dquot and dquot log item that
197 * are specific to the current transaction. If the
198 * hold flags is set, do not unlock the dquot.
201 xfs_qm_dquot_logitem_unlock(
202 struct xfs_log_item *lip)
204 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
206 ASSERT(XFS_DQ_IS_LOCKED(dqp));
209 * Clear the transaction pointer in the dquot
211 dqp->q_transp = NULL;
214 * dquots are never 'held' from getting unlocked at the end of
215 * a transaction. Their locking and unlocking is hidden inside the
216 * transaction layer, within trans_commit. Hence, no LI_HOLD flag
223 * this needs to stamp an lsn into the dquot, I think.
224 * rpc's that look at user dquot's would then have to
225 * push on the dependency recorded in the dquot
228 xfs_qm_dquot_logitem_committing(
229 struct xfs_log_item *lip,
235 * This is the ops vector for dquots
237 static const struct xfs_item_ops xfs_dquot_item_ops = {
238 .iop_size = xfs_qm_dquot_logitem_size,
239 .iop_format = xfs_qm_dquot_logitem_format,
240 .iop_pin = xfs_qm_dquot_logitem_pin,
241 .iop_unpin = xfs_qm_dquot_logitem_unpin,
242 .iop_unlock = xfs_qm_dquot_logitem_unlock,
243 .iop_committed = xfs_qm_dquot_logitem_committed,
244 .iop_push = xfs_qm_dquot_logitem_push,
245 .iop_committing = xfs_qm_dquot_logitem_committing
249 * Initialize the dquot log item for a newly allocated dquot.
250 * The dquot isn't locked at this point, but it isn't on any of the lists
251 * either, so we don't care.
254 xfs_qm_dquot_logitem_init(
255 struct xfs_dquot *dqp)
257 struct xfs_dq_logitem *lp = &dqp->q_logitem;
259 xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
260 &xfs_dquot_item_ops);
262 lp->qli_format.qlf_type = XFS_LI_DQUOT;
263 lp->qli_format.qlf_id = be32_to_cpu(dqp->q_core.d_id);
264 lp->qli_format.qlf_blkno = dqp->q_blkno;
265 lp->qli_format.qlf_len = 1;
267 * This is just the offset of this dquot within its buffer
268 * (which is currently 1 FSB and probably won't change).
269 * Hence 32 bits for this offset should be just fine.
270 * Alternatively, we can store (bufoffset / sizeof(xfs_dqblk_t))
271 * here, and recompute it at recovery time.
273 lp->qli_format.qlf_boffset = (__uint32_t)dqp->q_bufoffset;
276 /*------------------ QUOTAOFF LOG ITEMS -------------------*/
278 static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
280 return container_of(lip, struct xfs_qoff_logitem, qql_item);
285 * This returns the number of iovecs needed to log the given quotaoff item.
286 * We only need 1 iovec for an quotaoff item. It just logs the
287 * quotaoff_log_format structure.
290 xfs_qm_qoff_logitem_size(
291 struct xfs_log_item *lip)
297 * This is called to fill in the vector of log iovecs for the
298 * given quotaoff log item. We use only 1 iovec, and we point that
299 * at the quotaoff_log_format structure embedded in the quotaoff item.
300 * It is at this point that we assert that all of the extent
301 * slots in the quotaoff item have been filled.
304 xfs_qm_qoff_logitem_format(
305 struct xfs_log_item *lip,
306 struct xfs_log_iovec *log_vector)
308 struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip);
310 ASSERT(qflip->qql_format.qf_type == XFS_LI_QUOTAOFF);
312 log_vector->i_addr = &qflip->qql_format;
313 log_vector->i_len = sizeof(xfs_qoff_logitem_t);
314 log_vector->i_type = XLOG_REG_TYPE_QUOTAOFF;
315 qflip->qql_format.qf_size = 1;
319 * Pinning has no meaning for an quotaoff item, so just return.
322 xfs_qm_qoff_logitem_pin(
323 struct xfs_log_item *lip)
328 * Since pinning has no meaning for an quotaoff item, unpinning does
332 xfs_qm_qoff_logitem_unpin(
333 struct xfs_log_item *lip,
339 * There isn't much you can do to push a quotaoff item. It is simply
340 * stuck waiting for the log to be flushed to disk.
343 xfs_qm_qoff_logitem_push(
344 struct xfs_log_item *lip,
345 struct list_head *buffer_list)
347 return XFS_ITEM_LOCKED;
351 * Quotaoff items have no locking or pushing, so return failure
352 * so that the caller doesn't bother with us.
355 xfs_qm_qoff_logitem_unlock(
356 struct xfs_log_item *lip)
361 * The quotaoff-start-item is logged only once and cannot be moved in the log,
362 * so simply return the lsn at which it's been logged.
365 xfs_qm_qoff_logitem_committed(
366 struct xfs_log_item *lip,
373 xfs_qm_qoffend_logitem_committed(
374 struct xfs_log_item *lip,
377 struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip);
378 struct xfs_qoff_logitem *qfs = qfe->qql_start_lip;
379 struct xfs_ail *ailp = qfs->qql_item.li_ailp;
382 * Delete the qoff-start logitem from the AIL.
383 * xfs_trans_ail_delete() drops the AIL lock.
385 spin_lock(&ailp->xa_lock);
386 xfs_trans_ail_delete(ailp, &qfs->qql_item, SHUTDOWN_LOG_IO_ERROR);
390 return (xfs_lsn_t)-1;
394 * XXX rcc - don't know quite what to do with this. I think we can
395 * just ignore it. The only time that isn't the case is if we allow
396 * the client to somehow see that quotas have been turned off in which
397 * we can't allow that to get back until the quotaoff hits the disk.
398 * So how would that happen? Also, do we need different routines for
399 * quotaoff start and quotaoff end? I suspect the answer is yes but
400 * to be sure, I need to look at the recovery code and see how quota off
401 * recovery is handled (do we roll forward or back or do something else).
402 * If we roll forwards or backwards, then we need two separate routines,
403 * one that does nothing and one that stamps in the lsn that matters
404 * (truly makes the quotaoff irrevocable). If we do something else,
405 * then maybe we don't need two.
408 xfs_qm_qoff_logitem_committing(
409 struct xfs_log_item *lip,
410 xfs_lsn_t commit_lsn)
414 static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
415 .iop_size = xfs_qm_qoff_logitem_size,
416 .iop_format = xfs_qm_qoff_logitem_format,
417 .iop_pin = xfs_qm_qoff_logitem_pin,
418 .iop_unpin = xfs_qm_qoff_logitem_unpin,
419 .iop_unlock = xfs_qm_qoff_logitem_unlock,
420 .iop_committed = xfs_qm_qoffend_logitem_committed,
421 .iop_push = xfs_qm_qoff_logitem_push,
422 .iop_committing = xfs_qm_qoff_logitem_committing
426 * This is the ops vector shared by all quotaoff-start log items.
428 static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
429 .iop_size = xfs_qm_qoff_logitem_size,
430 .iop_format = xfs_qm_qoff_logitem_format,
431 .iop_pin = xfs_qm_qoff_logitem_pin,
432 .iop_unpin = xfs_qm_qoff_logitem_unpin,
433 .iop_unlock = xfs_qm_qoff_logitem_unlock,
434 .iop_committed = xfs_qm_qoff_logitem_committed,
435 .iop_push = xfs_qm_qoff_logitem_push,
436 .iop_committing = xfs_qm_qoff_logitem_committing
440 * Allocate and initialize an quotaoff item of the correct quota type(s).
442 struct xfs_qoff_logitem *
443 xfs_qm_qoff_logitem_init(
444 struct xfs_mount *mp,
445 struct xfs_qoff_logitem *start,
448 struct xfs_qoff_logitem *qf;
450 qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), KM_SLEEP);
452 xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ?
453 &xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops);
454 qf->qql_item.li_mountp = mp;
455 qf->qql_format.qf_type = XFS_LI_QUOTAOFF;
456 qf->qql_format.qf_flags = flags;
457 qf->qql_start_lip = start;