xfs: introduce xlog_copy_iovec
[platform/adaptation/renesas_rcar/renesas_kernel.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_format.h"
22 #include "xfs_trans_resv.h"
23 #include "xfs_sb.h"
24 #include "xfs_ag.h"
25 #include "xfs_mount.h"
26 #include "xfs_inode.h"
27 #include "xfs_quota.h"
28 #include "xfs_error.h"
29 #include "xfs_trans.h"
30 #include "xfs_buf_item.h"
31 #include "xfs_trans_priv.h"
32 #include "xfs_qm.h"
33 #include "xfs_log.h"
34
35 static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
36 {
37         return container_of(lip, struct xfs_dq_logitem, qli_item);
38 }
39
40 /*
41  * returns the number of iovecs needed to log the given dquot item.
42  */
43 STATIC void
44 xfs_qm_dquot_logitem_size(
45         struct xfs_log_item     *lip,
46         int                     *nvecs,
47         int                     *nbytes)
48 {
49         *nvecs += 2;
50         *nbytes += sizeof(struct xfs_dq_logformat) +
51                    sizeof(struct xfs_disk_dquot);
52 }
53
54 /*
55  * fills in the vector of log iovecs for the given dquot log item.
56  */
57 STATIC void
58 xfs_qm_dquot_logitem_format(
59         struct xfs_log_item     *lip,
60         struct xfs_log_iovec    *vecp)
61 {
62         struct xfs_dq_logitem   *qlip = DQUOT_ITEM(lip);
63
64         xlog_copy_iovec(&vecp, XLOG_REG_TYPE_QFORMAT,
65                         &qlip->qli_format,
66                         sizeof(struct xfs_dq_logformat));
67         xlog_copy_iovec(&vecp, XLOG_REG_TYPE_DQUOT,
68                         &qlip->qli_dquot->q_core,
69                         sizeof(struct xfs_disk_dquot));
70
71         qlip->qli_format.qlf_size = 2;
72 }
73
74 /*
75  * Increment the pin count of the given dquot.
76  */
77 STATIC void
78 xfs_qm_dquot_logitem_pin(
79         struct xfs_log_item     *lip)
80 {
81         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
82
83         ASSERT(XFS_DQ_IS_LOCKED(dqp));
84         atomic_inc(&dqp->q_pincount);
85 }
86
87 /*
88  * Decrement the pin count of the given dquot, and wake up
89  * anyone in xfs_dqwait_unpin() if the count goes to 0.  The
90  * dquot must have been previously pinned with a call to
91  * xfs_qm_dquot_logitem_pin().
92  */
93 STATIC void
94 xfs_qm_dquot_logitem_unpin(
95         struct xfs_log_item     *lip,
96         int                     remove)
97 {
98         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
99
100         ASSERT(atomic_read(&dqp->q_pincount) > 0);
101         if (atomic_dec_and_test(&dqp->q_pincount))
102                 wake_up(&dqp->q_pinwait);
103 }
104
105 STATIC xfs_lsn_t
106 xfs_qm_dquot_logitem_committed(
107         struct xfs_log_item     *lip,
108         xfs_lsn_t               lsn)
109 {
110         /*
111          * We always re-log the entire dquot when it becomes dirty,
112          * so, the latest copy _is_ the only one that matters.
113          */
114         return lsn;
115 }
116
117 /*
118  * This is called to wait for the given dquot to be unpinned.
119  * Most of these pin/unpin routines are plagiarized from inode code.
120  */
121 void
122 xfs_qm_dqunpin_wait(
123         struct xfs_dquot        *dqp)
124 {
125         ASSERT(XFS_DQ_IS_LOCKED(dqp));
126         if (atomic_read(&dqp->q_pincount) == 0)
127                 return;
128
129         /*
130          * Give the log a push so we don't wait here too long.
131          */
132         xfs_log_force(dqp->q_mount, 0);
133         wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
134 }
135
136 STATIC uint
137 xfs_qm_dquot_logitem_push(
138         struct xfs_log_item     *lip,
139         struct list_head        *buffer_list) __releases(&lip->li_ailp->xa_lock)
140                                               __acquires(&lip->li_ailp->xa_lock)
141 {
142         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
143         struct xfs_buf          *bp = NULL;
144         uint                    rval = XFS_ITEM_SUCCESS;
145         int                     error;
146
147         if (atomic_read(&dqp->q_pincount) > 0)
148                 return XFS_ITEM_PINNED;
149
150         if (!xfs_dqlock_nowait(dqp))
151                 return XFS_ITEM_LOCKED;
152
153         /*
154          * Re-check the pincount now that we stabilized the value by
155          * taking the quota lock.
156          */
157         if (atomic_read(&dqp->q_pincount) > 0) {
158                 rval = XFS_ITEM_PINNED;
159                 goto out_unlock;
160         }
161
162         /*
163          * Someone else is already flushing the dquot.  Nothing we can do
164          * here but wait for the flush to finish and remove the item from
165          * the AIL.
166          */
167         if (!xfs_dqflock_nowait(dqp)) {
168                 rval = XFS_ITEM_FLUSHING;
169                 goto out_unlock;
170         }
171
172         spin_unlock(&lip->li_ailp->xa_lock);
173
174         error = xfs_qm_dqflush(dqp, &bp);
175         if (error) {
176                 xfs_warn(dqp->q_mount, "%s: push error %d on dqp %p",
177                         __func__, error, dqp);
178         } else {
179                 if (!xfs_buf_delwri_queue(bp, buffer_list))
180                         rval = XFS_ITEM_FLUSHING;
181                 xfs_buf_relse(bp);
182         }
183
184         spin_lock(&lip->li_ailp->xa_lock);
185 out_unlock:
186         xfs_dqunlock(dqp);
187         return rval;
188 }
189
190 /*
191  * Unlock the dquot associated with the log item.
192  * Clear the fields of the dquot and dquot log item that
193  * are specific to the current transaction.  If the
194  * hold flags is set, do not unlock the dquot.
195  */
196 STATIC void
197 xfs_qm_dquot_logitem_unlock(
198         struct xfs_log_item     *lip)
199 {
200         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
201
202         ASSERT(XFS_DQ_IS_LOCKED(dqp));
203
204         /*
205          * Clear the transaction pointer in the dquot
206          */
207         dqp->q_transp = NULL;
208
209         /*
210          * dquots are never 'held' from getting unlocked at the end of
211          * a transaction.  Their locking and unlocking is hidden inside the
212          * transaction layer, within trans_commit. Hence, no LI_HOLD flag
213          * for the logitem.
214          */
215         xfs_dqunlock(dqp);
216 }
217
218 /*
219  * this needs to stamp an lsn into the dquot, I think.
220  * rpc's that look at user dquot's would then have to
221  * push on the dependency recorded in the dquot
222  */
223 STATIC void
224 xfs_qm_dquot_logitem_committing(
225         struct xfs_log_item     *lip,
226         xfs_lsn_t               lsn)
227 {
228 }
229
230 /*
231  * This is the ops vector for dquots
232  */
233 static const struct xfs_item_ops xfs_dquot_item_ops = {
234         .iop_size       = xfs_qm_dquot_logitem_size,
235         .iop_format     = xfs_qm_dquot_logitem_format,
236         .iop_pin        = xfs_qm_dquot_logitem_pin,
237         .iop_unpin      = xfs_qm_dquot_logitem_unpin,
238         .iop_unlock     = xfs_qm_dquot_logitem_unlock,
239         .iop_committed  = xfs_qm_dquot_logitem_committed,
240         .iop_push       = xfs_qm_dquot_logitem_push,
241         .iop_committing = xfs_qm_dquot_logitem_committing
242 };
243
244 /*
245  * Initialize the dquot log item for a newly allocated dquot.
246  * The dquot isn't locked at this point, but it isn't on any of the lists
247  * either, so we don't care.
248  */
249 void
250 xfs_qm_dquot_logitem_init(
251         struct xfs_dquot        *dqp)
252 {
253         struct xfs_dq_logitem   *lp = &dqp->q_logitem;
254
255         xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
256                                         &xfs_dquot_item_ops);
257         lp->qli_dquot = dqp;
258         lp->qli_format.qlf_type = XFS_LI_DQUOT;
259         lp->qli_format.qlf_id = be32_to_cpu(dqp->q_core.d_id);
260         lp->qli_format.qlf_blkno = dqp->q_blkno;
261         lp->qli_format.qlf_len = 1;
262         /*
263          * This is just the offset of this dquot within its buffer
264          * (which is currently 1 FSB and probably won't change).
265          * Hence 32 bits for this offset should be just fine.
266          * Alternatively, we can store (bufoffset / sizeof(xfs_dqblk_t))
267          * here, and recompute it at recovery time.
268          */
269         lp->qli_format.qlf_boffset = (__uint32_t)dqp->q_bufoffset;
270 }
271
272 /*------------------  QUOTAOFF LOG ITEMS  -------------------*/
273
274 static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
275 {
276         return container_of(lip, struct xfs_qoff_logitem, qql_item);
277 }
278
279
280 /*
281  * This returns the number of iovecs needed to log the given quotaoff item.
282  * We only need 1 iovec for an quotaoff item.  It just logs the
283  * quotaoff_log_format structure.
284  */
285 STATIC void
286 xfs_qm_qoff_logitem_size(
287         struct xfs_log_item     *lip,
288         int                     *nvecs,
289         int                     *nbytes)
290 {
291         *nvecs += 1;
292         *nbytes += sizeof(struct xfs_qoff_logitem);
293 }
294
295 /*
296  * This is called to fill in the vector of log iovecs for the
297  * given quotaoff log item. We use only 1 iovec, and we point that
298  * at the quotaoff_log_format structure embedded in the quotaoff item.
299  * It is at this point that we assert that all of the extent
300  * slots in the quotaoff item have been filled.
301  */
302 STATIC void
303 xfs_qm_qoff_logitem_format(
304         struct xfs_log_item     *lip,
305         struct xfs_log_iovec    *vecp)
306 {
307         struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip);
308
309         ASSERT(qflip->qql_format.qf_type == XFS_LI_QUOTAOFF);
310
311         xlog_copy_iovec(&vecp, XLOG_REG_TYPE_QUOTAOFF,
312                         &qflip->qql_format,
313                         sizeof(struct xfs_qoff_logitem));
314
315         qflip->qql_format.qf_size = 1;
316 }
317
318 /*
319  * Pinning has no meaning for an quotaoff item, so just return.
320  */
321 STATIC void
322 xfs_qm_qoff_logitem_pin(
323         struct xfs_log_item     *lip)
324 {
325 }
326
327 /*
328  * Since pinning has no meaning for an quotaoff item, unpinning does
329  * not either.
330  */
331 STATIC void
332 xfs_qm_qoff_logitem_unpin(
333         struct xfs_log_item     *lip,
334         int                     remove)
335 {
336 }
337
338 /*
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.
341  */
342 STATIC uint
343 xfs_qm_qoff_logitem_push(
344         struct xfs_log_item     *lip,
345         struct list_head        *buffer_list)
346 {
347         return XFS_ITEM_LOCKED;
348 }
349
350 /*
351  * Quotaoff items have no locking or pushing, so return failure
352  * so that the caller doesn't bother with us.
353  */
354 STATIC void
355 xfs_qm_qoff_logitem_unlock(
356         struct xfs_log_item     *lip)
357 {
358 }
359
360 /*
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.
363  */
364 STATIC xfs_lsn_t
365 xfs_qm_qoff_logitem_committed(
366         struct xfs_log_item     *lip,
367         xfs_lsn_t               lsn)
368 {
369         return lsn;
370 }
371
372 STATIC xfs_lsn_t
373 xfs_qm_qoffend_logitem_committed(
374         struct xfs_log_item     *lip,
375         xfs_lsn_t               lsn)
376 {
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;
380
381         /*
382          * Delete the qoff-start logitem from the AIL.
383          * xfs_trans_ail_delete() drops the AIL lock.
384          */
385         spin_lock(&ailp->xa_lock);
386         xfs_trans_ail_delete(ailp, &qfs->qql_item, SHUTDOWN_LOG_IO_ERROR);
387
388         kmem_free(qfs);
389         kmem_free(qfe);
390         return (xfs_lsn_t)-1;
391 }
392
393 /*
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.
406  */
407 STATIC void
408 xfs_qm_qoff_logitem_committing(
409         struct xfs_log_item     *lip,
410         xfs_lsn_t               commit_lsn)
411 {
412 }
413
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
423 };
424
425 /*
426  * This is the ops vector shared by all quotaoff-start log items.
427  */
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
437 };
438
439 /*
440  * Allocate and initialize an quotaoff item of the correct quota type(s).
441  */
442 struct xfs_qoff_logitem *
443 xfs_qm_qoff_logitem_init(
444         struct xfs_mount        *mp,
445         struct xfs_qoff_logitem *start,
446         uint                    flags)
447 {
448         struct xfs_qoff_logitem *qf;
449
450         qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), KM_SLEEP);
451
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;
458         return qf;
459 }