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[karo-tx-linux.git] / fs / xfs / xfs_dquot_item.c
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_format.h"
21 #include "xfs_log.h"
22 #include "xfs_trans.h"
23 #include "xfs_sb.h"
24 #include "xfs_ag.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"
30 #include "xfs_bmap.h"
31 #include "xfs_rtalloc.h"
32 #include "xfs_error.h"
33 #include "xfs_itable.h"
34 #include "xfs_attr.h"
35 #include "xfs_buf_item.h"
36 #include "xfs_trans_priv.h"
37 #include "xfs_qm.h"
38
39 static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
40 {
41         return container_of(lip, struct xfs_dq_logitem, qli_item);
42 }
43
44 /*
45  * returns the number of iovecs needed to log the given dquot item.
46  */
47 STATIC void
48 xfs_qm_dquot_logitem_size(
49         struct xfs_log_item     *lip,
50         int                     *nvecs,
51         int                     *nbytes)
52 {
53         *nvecs += 2;
54         *nbytes += sizeof(struct xfs_dq_logformat) +
55                    sizeof(struct xfs_disk_dquot);
56 }
57
58 /*
59  * fills in the vector of log iovecs for the given dquot log item.
60  */
61 STATIC void
62 xfs_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         qlip->qli_format.qlf_size = 2;
77
78 }
79
80 /*
81  * Increment the pin count of the given dquot.
82  */
83 STATIC void
84 xfs_qm_dquot_logitem_pin(
85         struct xfs_log_item     *lip)
86 {
87         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
88
89         ASSERT(XFS_DQ_IS_LOCKED(dqp));
90         atomic_inc(&dqp->q_pincount);
91 }
92
93 /*
94  * Decrement the pin count of the given dquot, and wake up
95  * anyone in xfs_dqwait_unpin() if the count goes to 0.  The
96  * dquot must have been previously pinned with a call to
97  * xfs_qm_dquot_logitem_pin().
98  */
99 STATIC void
100 xfs_qm_dquot_logitem_unpin(
101         struct xfs_log_item     *lip,
102         int                     remove)
103 {
104         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
105
106         ASSERT(atomic_read(&dqp->q_pincount) > 0);
107         if (atomic_dec_and_test(&dqp->q_pincount))
108                 wake_up(&dqp->q_pinwait);
109 }
110
111 STATIC xfs_lsn_t
112 xfs_qm_dquot_logitem_committed(
113         struct xfs_log_item     *lip,
114         xfs_lsn_t               lsn)
115 {
116         /*
117          * We always re-log the entire dquot when it becomes dirty,
118          * so, the latest copy _is_ the only one that matters.
119          */
120         return lsn;
121 }
122
123 /*
124  * This is called to wait for the given dquot to be unpinned.
125  * Most of these pin/unpin routines are plagiarized from inode code.
126  */
127 void
128 xfs_qm_dqunpin_wait(
129         struct xfs_dquot        *dqp)
130 {
131         ASSERT(XFS_DQ_IS_LOCKED(dqp));
132         if (atomic_read(&dqp->q_pincount) == 0)
133                 return;
134
135         /*
136          * Give the log a push so we don't wait here too long.
137          */
138         xfs_log_force(dqp->q_mount, 0);
139         wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
140 }
141
142 STATIC uint
143 xfs_qm_dquot_logitem_push(
144         struct xfs_log_item     *lip,
145         struct list_head        *buffer_list) __releases(&lip->li_ailp->xa_lock)
146                                               __acquires(&lip->li_ailp->xa_lock)
147 {
148         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
149         struct xfs_buf          *bp = NULL;
150         uint                    rval = XFS_ITEM_SUCCESS;
151         int                     error;
152
153         if (atomic_read(&dqp->q_pincount) > 0)
154                 return XFS_ITEM_PINNED;
155
156         if (!xfs_dqlock_nowait(dqp))
157                 return XFS_ITEM_LOCKED;
158
159         /*
160          * Re-check the pincount now that we stabilized the value by
161          * taking the quota lock.
162          */
163         if (atomic_read(&dqp->q_pincount) > 0) {
164                 rval = XFS_ITEM_PINNED;
165                 goto out_unlock;
166         }
167
168         /*
169          * Someone else is already flushing the dquot.  Nothing we can do
170          * here but wait for the flush to finish and remove the item from
171          * the AIL.
172          */
173         if (!xfs_dqflock_nowait(dqp)) {
174                 rval = XFS_ITEM_FLUSHING;
175                 goto out_unlock;
176         }
177
178         spin_unlock(&lip->li_ailp->xa_lock);
179
180         error = xfs_qm_dqflush(dqp, &bp);
181         if (error) {
182                 xfs_warn(dqp->q_mount, "%s: push error %d on dqp %p",
183                         __func__, error, dqp);
184         } else {
185                 if (!xfs_buf_delwri_queue(bp, buffer_list))
186                         rval = XFS_ITEM_FLUSHING;
187                 xfs_buf_relse(bp);
188         }
189
190         spin_lock(&lip->li_ailp->xa_lock);
191 out_unlock:
192         xfs_dqunlock(dqp);
193         return rval;
194 }
195
196 /*
197  * Unlock the dquot associated with the log item.
198  * Clear the fields of the dquot and dquot log item that
199  * are specific to the current transaction.  If the
200  * hold flags is set, do not unlock the dquot.
201  */
202 STATIC void
203 xfs_qm_dquot_logitem_unlock(
204         struct xfs_log_item     *lip)
205 {
206         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
207
208         ASSERT(XFS_DQ_IS_LOCKED(dqp));
209
210         /*
211          * Clear the transaction pointer in the dquot
212          */
213         dqp->q_transp = NULL;
214
215         /*
216          * dquots are never 'held' from getting unlocked at the end of
217          * a transaction.  Their locking and unlocking is hidden inside the
218          * transaction layer, within trans_commit. Hence, no LI_HOLD flag
219          * for the logitem.
220          */
221         xfs_dqunlock(dqp);
222 }
223
224 /*
225  * this needs to stamp an lsn into the dquot, I think.
226  * rpc's that look at user dquot's would then have to
227  * push on the dependency recorded in the dquot
228  */
229 STATIC void
230 xfs_qm_dquot_logitem_committing(
231         struct xfs_log_item     *lip,
232         xfs_lsn_t               lsn)
233 {
234 }
235
236 /*
237  * This is the ops vector for dquots
238  */
239 static const struct xfs_item_ops xfs_dquot_item_ops = {
240         .iop_size       = xfs_qm_dquot_logitem_size,
241         .iop_format     = xfs_qm_dquot_logitem_format,
242         .iop_pin        = xfs_qm_dquot_logitem_pin,
243         .iop_unpin      = xfs_qm_dquot_logitem_unpin,
244         .iop_unlock     = xfs_qm_dquot_logitem_unlock,
245         .iop_committed  = xfs_qm_dquot_logitem_committed,
246         .iop_push       = xfs_qm_dquot_logitem_push,
247         .iop_committing = xfs_qm_dquot_logitem_committing
248 };
249
250 /*
251  * Initialize the dquot log item for a newly allocated dquot.
252  * The dquot isn't locked at this point, but it isn't on any of the lists
253  * either, so we don't care.
254  */
255 void
256 xfs_qm_dquot_logitem_init(
257         struct xfs_dquot        *dqp)
258 {
259         struct xfs_dq_logitem   *lp = &dqp->q_logitem;
260
261         xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
262                                         &xfs_dquot_item_ops);
263         lp->qli_dquot = dqp;
264         lp->qli_format.qlf_type = XFS_LI_DQUOT;
265         lp->qli_format.qlf_id = be32_to_cpu(dqp->q_core.d_id);
266         lp->qli_format.qlf_blkno = dqp->q_blkno;
267         lp->qli_format.qlf_len = 1;
268         /*
269          * This is just the offset of this dquot within its buffer
270          * (which is currently 1 FSB and probably won't change).
271          * Hence 32 bits for this offset should be just fine.
272          * Alternatively, we can store (bufoffset / sizeof(xfs_dqblk_t))
273          * here, and recompute it at recovery time.
274          */
275         lp->qli_format.qlf_boffset = (__uint32_t)dqp->q_bufoffset;
276 }
277
278 /*------------------  QUOTAOFF LOG ITEMS  -------------------*/
279
280 static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
281 {
282         return container_of(lip, struct xfs_qoff_logitem, qql_item);
283 }
284
285
286 /*
287  * This returns the number of iovecs needed to log the given quotaoff item.
288  * We only need 1 iovec for an quotaoff item.  It just logs the
289  * quotaoff_log_format structure.
290  */
291 STATIC void
292 xfs_qm_qoff_logitem_size(
293         struct xfs_log_item     *lip,
294         int                     *nvecs,
295         int                     *nbytes)
296 {
297         *nvecs += 1;
298         *nbytes += sizeof(struct xfs_qoff_logitem);
299 }
300
301 /*
302  * This is called to fill in the vector of log iovecs for the
303  * given quotaoff log item. We use only 1 iovec, and we point that
304  * at the quotaoff_log_format structure embedded in the quotaoff item.
305  * It is at this point that we assert that all of the extent
306  * slots in the quotaoff item have been filled.
307  */
308 STATIC void
309 xfs_qm_qoff_logitem_format(
310         struct xfs_log_item     *lip,
311         struct xfs_log_iovec    *log_vector)
312 {
313         struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip);
314
315         ASSERT(qflip->qql_format.qf_type == XFS_LI_QUOTAOFF);
316
317         log_vector->i_addr = &qflip->qql_format;
318         log_vector->i_len = sizeof(xfs_qoff_logitem_t);
319         log_vector->i_type = XLOG_REG_TYPE_QUOTAOFF;
320         qflip->qql_format.qf_size = 1;
321 }
322
323 /*
324  * Pinning has no meaning for an quotaoff item, so just return.
325  */
326 STATIC void
327 xfs_qm_qoff_logitem_pin(
328         struct xfs_log_item     *lip)
329 {
330 }
331
332 /*
333  * Since pinning has no meaning for an quotaoff item, unpinning does
334  * not either.
335  */
336 STATIC void
337 xfs_qm_qoff_logitem_unpin(
338         struct xfs_log_item     *lip,
339         int                     remove)
340 {
341 }
342
343 /*
344  * There isn't much you can do to push a quotaoff item.  It is simply
345  * stuck waiting for the log to be flushed to disk.
346  */
347 STATIC uint
348 xfs_qm_qoff_logitem_push(
349         struct xfs_log_item     *lip,
350         struct list_head        *buffer_list)
351 {
352         return XFS_ITEM_LOCKED;
353 }
354
355 /*
356  * Quotaoff items have no locking or pushing, so return failure
357  * so that the caller doesn't bother with us.
358  */
359 STATIC void
360 xfs_qm_qoff_logitem_unlock(
361         struct xfs_log_item     *lip)
362 {
363 }
364
365 /*
366  * The quotaoff-start-item is logged only once and cannot be moved in the log,
367  * so simply return the lsn at which it's been logged.
368  */
369 STATIC xfs_lsn_t
370 xfs_qm_qoff_logitem_committed(
371         struct xfs_log_item     *lip,
372         xfs_lsn_t               lsn)
373 {
374         return lsn;
375 }
376
377 STATIC xfs_lsn_t
378 xfs_qm_qoffend_logitem_committed(
379         struct xfs_log_item     *lip,
380         xfs_lsn_t               lsn)
381 {
382         struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip);
383         struct xfs_qoff_logitem *qfs = qfe->qql_start_lip;
384         struct xfs_ail          *ailp = qfs->qql_item.li_ailp;
385
386         /*
387          * Delete the qoff-start logitem from the AIL.
388          * xfs_trans_ail_delete() drops the AIL lock.
389          */
390         spin_lock(&ailp->xa_lock);
391         xfs_trans_ail_delete(ailp, &qfs->qql_item, SHUTDOWN_LOG_IO_ERROR);
392
393         kmem_free(qfs);
394         kmem_free(qfe);
395         return (xfs_lsn_t)-1;
396 }
397
398 /*
399  * XXX rcc - don't know quite what to do with this.  I think we can
400  * just ignore it.  The only time that isn't the case is if we allow
401  * the client to somehow see that quotas have been turned off in which
402  * we can't allow that to get back until the quotaoff hits the disk.
403  * So how would that happen?  Also, do we need different routines for
404  * quotaoff start and quotaoff end?  I suspect the answer is yes but
405  * to be sure, I need to look at the recovery code and see how quota off
406  * recovery is handled (do we roll forward or back or do something else).
407  * If we roll forwards or backwards, then we need two separate routines,
408  * one that does nothing and one that stamps in the lsn that matters
409  * (truly makes the quotaoff irrevocable).  If we do something else,
410  * then maybe we don't need two.
411  */
412 STATIC void
413 xfs_qm_qoff_logitem_committing(
414         struct xfs_log_item     *lip,
415         xfs_lsn_t               commit_lsn)
416 {
417 }
418
419 static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
420         .iop_size       = xfs_qm_qoff_logitem_size,
421         .iop_format     = xfs_qm_qoff_logitem_format,
422         .iop_pin        = xfs_qm_qoff_logitem_pin,
423         .iop_unpin      = xfs_qm_qoff_logitem_unpin,
424         .iop_unlock     = xfs_qm_qoff_logitem_unlock,
425         .iop_committed  = xfs_qm_qoffend_logitem_committed,
426         .iop_push       = xfs_qm_qoff_logitem_push,
427         .iop_committing = xfs_qm_qoff_logitem_committing
428 };
429
430 /*
431  * This is the ops vector shared by all quotaoff-start log items.
432  */
433 static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
434         .iop_size       = xfs_qm_qoff_logitem_size,
435         .iop_format     = xfs_qm_qoff_logitem_format,
436         .iop_pin        = xfs_qm_qoff_logitem_pin,
437         .iop_unpin      = xfs_qm_qoff_logitem_unpin,
438         .iop_unlock     = xfs_qm_qoff_logitem_unlock,
439         .iop_committed  = xfs_qm_qoff_logitem_committed,
440         .iop_push       = xfs_qm_qoff_logitem_push,
441         .iop_committing = xfs_qm_qoff_logitem_committing
442 };
443
444 /*
445  * Allocate and initialize an quotaoff item of the correct quota type(s).
446  */
447 struct xfs_qoff_logitem *
448 xfs_qm_qoff_logitem_init(
449         struct xfs_mount        *mp,
450         struct xfs_qoff_logitem *start,
451         uint                    flags)
452 {
453         struct xfs_qoff_logitem *qf;
454
455         qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), KM_SLEEP);
456
457         xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ?
458                         &xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops);
459         qf->qql_item.li_mountp = mp;
460         qf->qql_format.qf_type = XFS_LI_QUOTAOFF;
461         qf->qql_format.qf_flags = flags;
462         qf->qql_start_lip = start;
463         return qf;
464 }