Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec...
[sfrench/cifs-2.6.git] / fs / ocfs2 / quota_global.c
1 /*
2  *  Implementation of operations over global quota file
3  */
4 #include <linux/spinlock.h>
5 #include <linux/fs.h>
6 #include <linux/slab.h>
7 #include <linux/quota.h>
8 #include <linux/quotaops.h>
9 #include <linux/dqblk_qtree.h>
10 #include <linux/jiffies.h>
11 #include <linux/writeback.h>
12 #include <linux/workqueue.h>
13
14 #include <cluster/masklog.h>
15
16 #include "ocfs2_fs.h"
17 #include "ocfs2.h"
18 #include "alloc.h"
19 #include "blockcheck.h"
20 #include "inode.h"
21 #include "journal.h"
22 #include "file.h"
23 #include "sysfile.h"
24 #include "dlmglue.h"
25 #include "uptodate.h"
26 #include "super.h"
27 #include "buffer_head_io.h"
28 #include "quota.h"
29 #include "ocfs2_trace.h"
30
31 /*
32  * Locking of quotas with OCFS2 is rather complex. Here are rules that
33  * should be obeyed by all the functions:
34  * - any write of quota structure (either to local or global file) is protected
35  *   by dqio_mutex or dquot->dq_lock.
36  * - any modification of global quota file holds inode cluster lock, i_mutex,
37  *   and ip_alloc_sem of the global quota file (achieved by
38  *   ocfs2_lock_global_qf). It also has to hold qinfo_lock.
39  * - an allocation of new blocks for local quota file is protected by
40  *   its ip_alloc_sem
41  *
42  * A rough sketch of locking dependencies (lf = local file, gf = global file):
43  * Normal filesystem operation:
44  *   start_trans -> dqio_mutex -> write to lf
45  * Syncing of local and global file:
46  *   ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock ->
47  *     write to gf
48  *                                                     -> write to lf
49  * Acquire dquot for the first time:
50  *   dq_lock -> ocfs2_lock_global_qf -> qinfo_lock -> read from gf
51  *                                   -> alloc space for gf
52  *                                   -> start_trans -> qinfo_lock -> write to gf
53  *           -> ip_alloc_sem of lf -> alloc space for lf
54  *           -> write to lf
55  * Release last reference to dquot:
56  *   dq_lock -> ocfs2_lock_global_qf -> start_trans -> qinfo_lock -> write to gf
57  *           -> write to lf
58  * Note that all the above operations also hold the inode cluster lock of lf.
59  * Recovery:
60  *   inode cluster lock of recovered lf
61  *     -> read bitmaps -> ip_alloc_sem of lf
62  *     -> ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock ->
63  *        write to gf
64  */
65
66 static void qsync_work_fn(struct work_struct *work);
67
68 static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
69 {
70         struct ocfs2_global_disk_dqblk *d = dp;
71         struct mem_dqblk *m = &dquot->dq_dqb;
72
73         /* Update from disk only entries not set by the admin */
74         if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
75                 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
76                 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
77         }
78         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
79                 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
80         if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
81                 m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
82                 m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
83         }
84         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
85                 m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
86         if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
87                 m->dqb_btime = le64_to_cpu(d->dqb_btime);
88         if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
89                 m->dqb_itime = le64_to_cpu(d->dqb_itime);
90         OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
91 }
92
93 static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
94 {
95         struct ocfs2_global_disk_dqblk *d = dp;
96         struct mem_dqblk *m = &dquot->dq_dqb;
97
98         d->dqb_id = cpu_to_le32(dquot->dq_id);
99         d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
100         d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
101         d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
102         d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
103         d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
104         d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
105         d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
106         d->dqb_btime = cpu_to_le64(m->dqb_btime);
107         d->dqb_itime = cpu_to_le64(m->dqb_itime);
108         d->dqb_pad1 = d->dqb_pad2 = 0;
109 }
110
111 static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
112 {
113         struct ocfs2_global_disk_dqblk *d = dp;
114         struct ocfs2_mem_dqinfo *oinfo =
115                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
116
117         if (qtree_entry_unused(&oinfo->dqi_gi, dp))
118                 return 0;
119         return le32_to_cpu(d->dqb_id) == dquot->dq_id;
120 }
121
122 struct qtree_fmt_operations ocfs2_global_ops = {
123         .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
124         .disk2mem_dqblk = ocfs2_global_disk2memdqb,
125         .is_id = ocfs2_global_is_id,
126 };
127
128 int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh)
129 {
130         struct ocfs2_disk_dqtrailer *dqt =
131                 ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
132
133         trace_ocfs2_validate_quota_block((unsigned long long)bh->b_blocknr);
134
135         BUG_ON(!buffer_uptodate(bh));
136
137         /*
138          * If the ecc fails, we return the error but otherwise
139          * leave the filesystem running.  We know any error is
140          * local to this block.
141          */
142         return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
143 }
144
145 int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
146                                 struct buffer_head **bhp)
147 {
148         int rc;
149
150         *bhp = NULL;
151         rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, 1, bhp, 0,
152                                ocfs2_validate_quota_block);
153         if (rc)
154                 mlog_errno(rc);
155         return rc;
156 }
157
158 /* Read data from global quotafile - avoid pagecache and such because we cannot
159  * afford acquiring the locks... We use quota cluster lock to serialize
160  * operations. Caller is responsible for acquiring it. */
161 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
162                          size_t len, loff_t off)
163 {
164         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
165         struct inode *gqinode = oinfo->dqi_gqinode;
166         loff_t i_size = i_size_read(gqinode);
167         int offset = off & (sb->s_blocksize - 1);
168         sector_t blk = off >> sb->s_blocksize_bits;
169         int err = 0;
170         struct buffer_head *bh;
171         size_t toread, tocopy;
172         u64 pblock = 0, pcount = 0;
173
174         if (off > i_size)
175                 return 0;
176         if (off + len > i_size)
177                 len = i_size - off;
178         toread = len;
179         while (toread > 0) {
180                 tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
181                 if (!pcount) {
182                         err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock,
183                                                           &pcount, NULL);
184                         if (err) {
185                                 mlog_errno(err);
186                                 return err;
187                         }
188                 } else {
189                         pcount--;
190                         pblock++;
191                 }
192                 bh = NULL;
193                 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
194                 if (err) {
195                         mlog_errno(err);
196                         return err;
197                 }
198                 memcpy(data, bh->b_data + offset, tocopy);
199                 brelse(bh);
200                 offset = 0;
201                 toread -= tocopy;
202                 data += tocopy;
203                 blk++;
204         }
205         return len;
206 }
207
208 /* Write to quotafile (we know the transaction is already started and has
209  * enough credits) */
210 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
211                           const char *data, size_t len, loff_t off)
212 {
213         struct mem_dqinfo *info = sb_dqinfo(sb, type);
214         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
215         struct inode *gqinode = oinfo->dqi_gqinode;
216         int offset = off & (sb->s_blocksize - 1);
217         sector_t blk = off >> sb->s_blocksize_bits;
218         int err = 0, new = 0, ja_type;
219         struct buffer_head *bh = NULL;
220         handle_t *handle = journal_current_handle();
221         u64 pblock, pcount;
222
223         if (!handle) {
224                 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
225                      "because transaction was not started.\n",
226                      (unsigned long long)off, (unsigned long long)len);
227                 return -EIO;
228         }
229         if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
230                 WARN_ON(1);
231                 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
232         }
233
234         if (gqinode->i_size < off + len) {
235                 loff_t rounded_end =
236                                 ocfs2_align_bytes_to_blocks(sb, off + len);
237
238                 /* Space is already allocated in ocfs2_acquire_dquot() */
239                 err = ocfs2_simple_size_update(gqinode,
240                                                oinfo->dqi_gqi_bh,
241                                                rounded_end);
242                 if (err < 0)
243                         goto out;
244                 new = 1;
245         }
246         err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, &pcount, NULL);
247         if (err) {
248                 mlog_errno(err);
249                 goto out;
250         }
251         /* Not rewriting whole block? */
252         if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
253             !new) {
254                 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
255                 ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
256         } else {
257                 bh = sb_getblk(sb, pblock);
258                 if (!bh)
259                         err = -ENOMEM;
260                 ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
261         }
262         if (err) {
263                 mlog_errno(err);
264                 goto out;
265         }
266         lock_buffer(bh);
267         if (new)
268                 memset(bh->b_data, 0, sb->s_blocksize);
269         memcpy(bh->b_data + offset, data, len);
270         flush_dcache_page(bh->b_page);
271         set_buffer_uptodate(bh);
272         unlock_buffer(bh);
273         ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh);
274         err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh,
275                                       ja_type);
276         if (err < 0) {
277                 brelse(bh);
278                 goto out;
279         }
280         ocfs2_journal_dirty(handle, bh);
281         brelse(bh);
282 out:
283         if (err) {
284                 mlog_errno(err);
285                 return err;
286         }
287         gqinode->i_version++;
288         ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
289         return len;
290 }
291
292 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
293 {
294         int status;
295         struct buffer_head *bh = NULL;
296
297         status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
298         if (status < 0)
299                 return status;
300         spin_lock(&dq_data_lock);
301         if (!oinfo->dqi_gqi_count++)
302                 oinfo->dqi_gqi_bh = bh;
303         else
304                 WARN_ON(bh != oinfo->dqi_gqi_bh);
305         spin_unlock(&dq_data_lock);
306         if (ex) {
307                 mutex_lock(&oinfo->dqi_gqinode->i_mutex);
308                 down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
309         } else {
310                 down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
311         }
312         return 0;
313 }
314
315 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
316 {
317         if (ex) {
318                 up_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
319                 mutex_unlock(&oinfo->dqi_gqinode->i_mutex);
320         } else {
321                 up_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
322         }
323         ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
324         brelse(oinfo->dqi_gqi_bh);
325         spin_lock(&dq_data_lock);
326         if (!--oinfo->dqi_gqi_count)
327                 oinfo->dqi_gqi_bh = NULL;
328         spin_unlock(&dq_data_lock);
329 }
330
331 /* Read information header from global quota file */
332 int ocfs2_global_read_info(struct super_block *sb, int type)
333 {
334         struct inode *gqinode = NULL;
335         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
336                                         GROUP_QUOTA_SYSTEM_INODE };
337         struct ocfs2_global_disk_dqinfo dinfo;
338         struct mem_dqinfo *info = sb_dqinfo(sb, type);
339         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
340         u64 pcount;
341         int status;
342
343         /* Read global header */
344         gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
345                         OCFS2_INVALID_SLOT);
346         if (!gqinode) {
347                 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
348                         type);
349                 status = -EINVAL;
350                 goto out_err;
351         }
352         oinfo->dqi_gi.dqi_sb = sb;
353         oinfo->dqi_gi.dqi_type = type;
354         ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
355         oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
356         oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
357         oinfo->dqi_gqi_bh = NULL;
358         oinfo->dqi_gqi_count = 0;
359         oinfo->dqi_gqinode = gqinode;
360         status = ocfs2_lock_global_qf(oinfo, 0);
361         if (status < 0) {
362                 mlog_errno(status);
363                 goto out_err;
364         }
365
366         status = ocfs2_extent_map_get_blocks(gqinode, 0, &oinfo->dqi_giblk,
367                                              &pcount, NULL);
368         if (status < 0)
369                 goto out_unlock;
370
371         status = ocfs2_qinfo_lock(oinfo, 0);
372         if (status < 0)
373                 goto out_unlock;
374         status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
375                                       sizeof(struct ocfs2_global_disk_dqinfo),
376                                       OCFS2_GLOBAL_INFO_OFF);
377         ocfs2_qinfo_unlock(oinfo, 0);
378         ocfs2_unlock_global_qf(oinfo, 0);
379         if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
380                 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
381                      status);
382                 if (status >= 0)
383                         status = -EIO;
384                 mlog_errno(status);
385                 goto out_err;
386         }
387         info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
388         info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
389         oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
390         oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
391         oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
392         oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
393         oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
394         oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
395                                                 OCFS2_QBLK_RESERVED_SPACE;
396         oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
397         INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
398         schedule_delayed_work(&oinfo->dqi_sync_work,
399                               msecs_to_jiffies(oinfo->dqi_syncms));
400
401 out_err:
402         if (status)
403                 mlog_errno(status);
404         return status;
405 out_unlock:
406         ocfs2_unlock_global_qf(oinfo, 0);
407         mlog_errno(status);
408         goto out_err;
409 }
410
411 /* Write information to global quota file. Expects exlusive lock on quota
412  * file inode and quota info */
413 static int __ocfs2_global_write_info(struct super_block *sb, int type)
414 {
415         struct mem_dqinfo *info = sb_dqinfo(sb, type);
416         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
417         struct ocfs2_global_disk_dqinfo dinfo;
418         ssize_t size;
419
420         spin_lock(&dq_data_lock);
421         info->dqi_flags &= ~DQF_INFO_DIRTY;
422         dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
423         dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
424         spin_unlock(&dq_data_lock);
425         dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
426         dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
427         dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
428         dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
429         size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
430                                      sizeof(struct ocfs2_global_disk_dqinfo),
431                                      OCFS2_GLOBAL_INFO_OFF);
432         if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
433                 mlog(ML_ERROR, "Cannot write global quota info structure\n");
434                 if (size >= 0)
435                         size = -EIO;
436                 return size;
437         }
438         return 0;
439 }
440
441 int ocfs2_global_write_info(struct super_block *sb, int type)
442 {
443         int err;
444         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
445
446         err = ocfs2_qinfo_lock(info, 1);
447         if (err < 0)
448                 return err;
449         err = __ocfs2_global_write_info(sb, type);
450         ocfs2_qinfo_unlock(info, 1);
451         return err;
452 }
453
454 static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
455 {
456         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
457
458         /*
459          * We may need to allocate tree blocks and a leaf block but not the
460          * root block
461          */
462         return oinfo->dqi_gi.dqi_qtree_depth;
463 }
464
465 static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
466 {
467         /* We modify all the allocated blocks, tree root, info block and
468          * the inode */
469         return (ocfs2_global_qinit_alloc(sb, type) + 2) *
470                         OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1;
471 }
472
473 /* Sync local information about quota modifications with global quota file.
474  * Caller must have started the transaction and obtained exclusive lock for
475  * global quota file inode */
476 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
477 {
478         int err, err2;
479         struct super_block *sb = dquot->dq_sb;
480         int type = dquot->dq_type;
481         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
482         struct ocfs2_global_disk_dqblk dqblk;
483         s64 spacechange, inodechange;
484         time_t olditime, oldbtime;
485
486         err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
487                                    sizeof(struct ocfs2_global_disk_dqblk),
488                                    dquot->dq_off);
489         if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
490                 if (err >= 0) {
491                         mlog(ML_ERROR, "Short read from global quota file "
492                                        "(%u read)\n", err);
493                         err = -EIO;
494                 }
495                 goto out;
496         }
497
498         /* Update space and inode usage. Get also other information from
499          * global quota file so that we don't overwrite any changes there.
500          * We are */
501         spin_lock(&dq_data_lock);
502         spacechange = dquot->dq_dqb.dqb_curspace -
503                                         OCFS2_DQUOT(dquot)->dq_origspace;
504         inodechange = dquot->dq_dqb.dqb_curinodes -
505                                         OCFS2_DQUOT(dquot)->dq_originodes;
506         olditime = dquot->dq_dqb.dqb_itime;
507         oldbtime = dquot->dq_dqb.dqb_btime;
508         ocfs2_global_disk2memdqb(dquot, &dqblk);
509         trace_ocfs2_sync_dquot(dquot->dq_id, dquot->dq_dqb.dqb_curspace,
510                                (long long)spacechange,
511                                dquot->dq_dqb.dqb_curinodes,
512                                (long long)inodechange);
513         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
514                 dquot->dq_dqb.dqb_curspace += spacechange;
515         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
516                 dquot->dq_dqb.dqb_curinodes += inodechange;
517         /* Set properly space grace time... */
518         if (dquot->dq_dqb.dqb_bsoftlimit &&
519             dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
520                 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
521                     oldbtime > 0) {
522                         if (dquot->dq_dqb.dqb_btime > 0)
523                                 dquot->dq_dqb.dqb_btime =
524                                         min(dquot->dq_dqb.dqb_btime, oldbtime);
525                         else
526                                 dquot->dq_dqb.dqb_btime = oldbtime;
527                 }
528         } else {
529                 dquot->dq_dqb.dqb_btime = 0;
530                 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
531         }
532         /* Set properly inode grace time... */
533         if (dquot->dq_dqb.dqb_isoftlimit &&
534             dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
535                 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
536                     olditime > 0) {
537                         if (dquot->dq_dqb.dqb_itime > 0)
538                                 dquot->dq_dqb.dqb_itime =
539                                         min(dquot->dq_dqb.dqb_itime, olditime);
540                         else
541                                 dquot->dq_dqb.dqb_itime = olditime;
542                 }
543         } else {
544                 dquot->dq_dqb.dqb_itime = 0;
545                 clear_bit(DQ_INODES_B, &dquot->dq_flags);
546         }
547         /* All information is properly updated, clear the flags */
548         __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
549         __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
550         __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
551         __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
552         __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
553         __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
554         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
555         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
556         spin_unlock(&dq_data_lock);
557         err = ocfs2_qinfo_lock(info, freeing);
558         if (err < 0) {
559                 mlog(ML_ERROR, "Failed to lock quota info, loosing quota write"
560                                " (type=%d, id=%u)\n", dquot->dq_type,
561                                (unsigned)dquot->dq_id);
562                 goto out;
563         }
564         if (freeing)
565                 OCFS2_DQUOT(dquot)->dq_use_count--;
566         err = qtree_write_dquot(&info->dqi_gi, dquot);
567         if (err < 0)
568                 goto out_qlock;
569         if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
570                 err = qtree_release_dquot(&info->dqi_gi, dquot);
571                 if (info_dirty(sb_dqinfo(sb, type))) {
572                         err2 = __ocfs2_global_write_info(sb, type);
573                         if (!err)
574                                 err = err2;
575                 }
576         }
577 out_qlock:
578         ocfs2_qinfo_unlock(info, freeing);
579 out:
580         if (err < 0)
581                 mlog_errno(err);
582         return err;
583 }
584
585 /*
586  *  Functions for periodic syncing of dquots with global file
587  */
588 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
589 {
590         handle_t *handle;
591         struct super_block *sb = dquot->dq_sb;
592         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
593         struct ocfs2_super *osb = OCFS2_SB(sb);
594         int status = 0;
595
596         trace_ocfs2_sync_dquot_helper(dquot->dq_id, dquot->dq_type,
597                                       type, sb->s_id);
598         if (type != dquot->dq_type)
599                 goto out;
600         status = ocfs2_lock_global_qf(oinfo, 1);
601         if (status < 0)
602                 goto out;
603
604         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
605         if (IS_ERR(handle)) {
606                 status = PTR_ERR(handle);
607                 mlog_errno(status);
608                 goto out_ilock;
609         }
610         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
611         status = ocfs2_sync_dquot(dquot);
612         if (status < 0)
613                 mlog_errno(status);
614         /* We have to write local structure as well... */
615         status = ocfs2_local_write_dquot(dquot);
616         if (status < 0)
617                 mlog_errno(status);
618         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
619         ocfs2_commit_trans(osb, handle);
620 out_ilock:
621         ocfs2_unlock_global_qf(oinfo, 1);
622 out:
623         return status;
624 }
625
626 static void qsync_work_fn(struct work_struct *work)
627 {
628         struct ocfs2_mem_dqinfo *oinfo = container_of(work,
629                                                       struct ocfs2_mem_dqinfo,
630                                                       dqi_sync_work.work);
631         struct super_block *sb = oinfo->dqi_gqinode->i_sb;
632
633         dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
634         schedule_delayed_work(&oinfo->dqi_sync_work,
635                               msecs_to_jiffies(oinfo->dqi_syncms));
636 }
637
638 /*
639  *  Wrappers for generic quota functions
640  */
641
642 static int ocfs2_write_dquot(struct dquot *dquot)
643 {
644         handle_t *handle;
645         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
646         int status = 0;
647
648         trace_ocfs2_write_dquot(dquot->dq_id, dquot->dq_type);
649
650         handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
651         if (IS_ERR(handle)) {
652                 status = PTR_ERR(handle);
653                 mlog_errno(status);
654                 goto out;
655         }
656         mutex_lock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
657         status = ocfs2_local_write_dquot(dquot);
658         mutex_unlock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
659         ocfs2_commit_trans(osb, handle);
660 out:
661         return status;
662 }
663
664 static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
665 {
666         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
667         /*
668          * We modify tree, leaf block, global info, local chunk header,
669          * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
670          * accounts for inode update
671          */
672         return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
673                OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
674                OCFS2_QINFO_WRITE_CREDITS +
675                OCFS2_INODE_UPDATE_CREDITS;
676 }
677
678 static int ocfs2_release_dquot(struct dquot *dquot)
679 {
680         handle_t *handle;
681         struct ocfs2_mem_dqinfo *oinfo =
682                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
683         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
684         int status = 0;
685
686         trace_ocfs2_release_dquot(dquot->dq_id, dquot->dq_type);
687
688         mutex_lock(&dquot->dq_lock);
689         /* Check whether we are not racing with some other dqget() */
690         if (atomic_read(&dquot->dq_count) > 1)
691                 goto out;
692         status = ocfs2_lock_global_qf(oinfo, 1);
693         if (status < 0)
694                 goto out;
695         handle = ocfs2_start_trans(osb,
696                 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
697         if (IS_ERR(handle)) {
698                 status = PTR_ERR(handle);
699                 mlog_errno(status);
700                 goto out_ilock;
701         }
702
703         status = ocfs2_global_release_dquot(dquot);
704         if (status < 0) {
705                 mlog_errno(status);
706                 goto out_trans;
707         }
708         status = ocfs2_local_release_dquot(handle, dquot);
709         /*
710          * If we fail here, we cannot do much as global structure is
711          * already released. So just complain...
712          */
713         if (status < 0)
714                 mlog_errno(status);
715         clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
716 out_trans:
717         ocfs2_commit_trans(osb, handle);
718 out_ilock:
719         ocfs2_unlock_global_qf(oinfo, 1);
720 out:
721         mutex_unlock(&dquot->dq_lock);
722         if (status)
723                 mlog_errno(status);
724         return status;
725 }
726
727 /*
728  * Read global dquot structure from disk or create it if it does
729  * not exist. Also update use count of the global structure and
730  * create structure in node-local quota file.
731  */
732 static int ocfs2_acquire_dquot(struct dquot *dquot)
733 {
734         int status = 0, err;
735         int ex = 0;
736         struct super_block *sb = dquot->dq_sb;
737         struct ocfs2_super *osb = OCFS2_SB(sb);
738         int type = dquot->dq_type;
739         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
740         struct inode *gqinode = info->dqi_gqinode;
741         int need_alloc = ocfs2_global_qinit_alloc(sb, type);
742         handle_t *handle;
743
744         trace_ocfs2_acquire_dquot(dquot->dq_id, type);
745         mutex_lock(&dquot->dq_lock);
746         /*
747          * We need an exclusive lock, because we're going to update use count
748          * and instantiate possibly new dquot structure
749          */
750         status = ocfs2_lock_global_qf(info, 1);
751         if (status < 0)
752                 goto out;
753         if (!test_bit(DQ_READ_B, &dquot->dq_flags)) {
754                 status = ocfs2_qinfo_lock(info, 0);
755                 if (status < 0)
756                         goto out_dq;
757                 status = qtree_read_dquot(&info->dqi_gi, dquot);
758                 ocfs2_qinfo_unlock(info, 0);
759                 if (status < 0)
760                         goto out_dq;
761         }
762         set_bit(DQ_READ_B, &dquot->dq_flags);
763
764         OCFS2_DQUOT(dquot)->dq_use_count++;
765         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
766         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
767         if (!dquot->dq_off) {   /* No real quota entry? */
768                 ex = 1;
769                 /*
770                  * Add blocks to quota file before we start a transaction since
771                  * locking allocators ranks above a transaction start
772                  */
773                 WARN_ON(journal_current_handle());
774                 status = ocfs2_extend_no_holes(gqinode, NULL,
775                         gqinode->i_size + (need_alloc << sb->s_blocksize_bits),
776                         gqinode->i_size);
777                 if (status < 0)
778                         goto out_dq;
779         }
780
781         handle = ocfs2_start_trans(osb,
782                                    ocfs2_calc_global_qinit_credits(sb, type));
783         if (IS_ERR(handle)) {
784                 status = PTR_ERR(handle);
785                 goto out_dq;
786         }
787         status = ocfs2_qinfo_lock(info, ex);
788         if (status < 0)
789                 goto out_trans;
790         status = qtree_write_dquot(&info->dqi_gi, dquot);
791         if (ex && info_dirty(sb_dqinfo(sb, type))) {
792                 err = __ocfs2_global_write_info(sb, type);
793                 if (!status)
794                         status = err;
795         }
796         ocfs2_qinfo_unlock(info, ex);
797 out_trans:
798         ocfs2_commit_trans(osb, handle);
799 out_dq:
800         ocfs2_unlock_global_qf(info, 1);
801         if (status < 0)
802                 goto out;
803
804         status = ocfs2_create_local_dquot(dquot);
805         if (status < 0)
806                 goto out;
807         set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
808 out:
809         mutex_unlock(&dquot->dq_lock);
810         if (status)
811                 mlog_errno(status);
812         return status;
813 }
814
815 static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
816 {
817         unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
818                              (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
819                              (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
820                              (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
821                              (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
822                              (1 << (DQ_LASTSET_B + QIF_ITIME_B));
823         int sync = 0;
824         int status;
825         struct super_block *sb = dquot->dq_sb;
826         int type = dquot->dq_type;
827         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
828         handle_t *handle;
829         struct ocfs2_super *osb = OCFS2_SB(sb);
830
831         trace_ocfs2_mark_dquot_dirty(dquot->dq_id, type);
832
833         /* In case user set some limits, sync dquot immediately to global
834          * quota file so that information propagates quicker */
835         spin_lock(&dq_data_lock);
836         if (dquot->dq_flags & mask)
837                 sync = 1;
838         spin_unlock(&dq_data_lock);
839         /* This is a slight hack but we can't afford getting global quota
840          * lock if we already have a transaction started. */
841         if (!sync || journal_current_handle()) {
842                 status = ocfs2_write_dquot(dquot);
843                 goto out;
844         }
845         status = ocfs2_lock_global_qf(oinfo, 1);
846         if (status < 0)
847                 goto out;
848         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
849         if (IS_ERR(handle)) {
850                 status = PTR_ERR(handle);
851                 mlog_errno(status);
852                 goto out_ilock;
853         }
854         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
855         status = ocfs2_sync_dquot(dquot);
856         if (status < 0) {
857                 mlog_errno(status);
858                 goto out_dlock;
859         }
860         /* Now write updated local dquot structure */
861         status = ocfs2_local_write_dquot(dquot);
862 out_dlock:
863         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
864         ocfs2_commit_trans(osb, handle);
865 out_ilock:
866         ocfs2_unlock_global_qf(oinfo, 1);
867 out:
868         if (status)
869                 mlog_errno(status);
870         return status;
871 }
872
873 /* This should happen only after set_dqinfo(). */
874 static int ocfs2_write_info(struct super_block *sb, int type)
875 {
876         handle_t *handle;
877         int status = 0;
878         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
879
880         status = ocfs2_lock_global_qf(oinfo, 1);
881         if (status < 0)
882                 goto out;
883         handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
884         if (IS_ERR(handle)) {
885                 status = PTR_ERR(handle);
886                 mlog_errno(status);
887                 goto out_ilock;
888         }
889         status = dquot_commit_info(sb, type);
890         ocfs2_commit_trans(OCFS2_SB(sb), handle);
891 out_ilock:
892         ocfs2_unlock_global_qf(oinfo, 1);
893 out:
894         if (status)
895                 mlog_errno(status);
896         return status;
897 }
898
899 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
900 {
901         struct ocfs2_dquot *dquot =
902                                 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
903
904         if (!dquot)
905                 return NULL;
906         return &dquot->dq_dquot;
907 }
908
909 static void ocfs2_destroy_dquot(struct dquot *dquot)
910 {
911         kmem_cache_free(ocfs2_dquot_cachep, dquot);
912 }
913
914 const struct dquot_operations ocfs2_quota_operations = {
915         /* We never make dquot dirty so .write_dquot is never called */
916         .acquire_dquot  = ocfs2_acquire_dquot,
917         .release_dquot  = ocfs2_release_dquot,
918         .mark_dirty     = ocfs2_mark_dquot_dirty,
919         .write_info     = ocfs2_write_info,
920         .alloc_dquot    = ocfs2_alloc_dquot,
921         .destroy_dquot  = ocfs2_destroy_dquot,
922 };