Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6] / 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/quota.h>
7 #include <linux/quotaops.h>
8 #include <linux/dqblk_qtree.h>
9 #include <linux/jiffies.h>
10 #include <linux/writeback.h>
11 #include <linux/workqueue.h>
12
13 #define MLOG_MASK_PREFIX ML_QUOTA
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 "quota.h"
27
28 static struct workqueue_struct *ocfs2_quota_wq = NULL;
29
30 static void qsync_work_fn(struct work_struct *work);
31
32 static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
33 {
34         struct ocfs2_global_disk_dqblk *d = dp;
35         struct mem_dqblk *m = &dquot->dq_dqb;
36
37         /* Update from disk only entries not set by the admin */
38         if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
39                 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
40                 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
41         }
42         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
43                 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
44         if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
45                 m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
46                 m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
47         }
48         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
49                 m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
50         if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
51                 m->dqb_btime = le64_to_cpu(d->dqb_btime);
52         if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
53                 m->dqb_itime = le64_to_cpu(d->dqb_itime);
54         OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
55 }
56
57 static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
58 {
59         struct ocfs2_global_disk_dqblk *d = dp;
60         struct mem_dqblk *m = &dquot->dq_dqb;
61
62         d->dqb_id = cpu_to_le32(dquot->dq_id);
63         d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
64         d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
65         d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
66         d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
67         d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
68         d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
69         d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
70         d->dqb_btime = cpu_to_le64(m->dqb_btime);
71         d->dqb_itime = cpu_to_le64(m->dqb_itime);
72 }
73
74 static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
75 {
76         struct ocfs2_global_disk_dqblk *d = dp;
77         struct ocfs2_mem_dqinfo *oinfo =
78                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
79
80         if (qtree_entry_unused(&oinfo->dqi_gi, dp))
81                 return 0;
82         return le32_to_cpu(d->dqb_id) == dquot->dq_id;
83 }
84
85 struct qtree_fmt_operations ocfs2_global_ops = {
86         .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
87         .disk2mem_dqblk = ocfs2_global_disk2memdqb,
88         .is_id = ocfs2_global_is_id,
89 };
90
91 static int ocfs2_validate_quota_block(struct super_block *sb,
92                                       struct buffer_head *bh)
93 {
94         struct ocfs2_disk_dqtrailer *dqt =
95                 ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
96
97         mlog(0, "Validating quota block %llu\n",
98              (unsigned long long)bh->b_blocknr);
99
100         BUG_ON(!buffer_uptodate(bh));
101
102         /*
103          * If the ecc fails, we return the error but otherwise
104          * leave the filesystem running.  We know any error is
105          * local to this block.
106          */
107         return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
108 }
109
110 int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
111                            struct buffer_head **bh)
112 {
113         int rc = 0;
114         struct buffer_head *tmp = *bh;
115
116         rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, 0,
117                                     ocfs2_validate_quota_block);
118         if (rc)
119                 mlog_errno(rc);
120
121         /* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
122         if (!rc && !*bh)
123                 *bh = tmp;
124
125         return rc;
126 }
127
128 static int ocfs2_get_quota_block(struct inode *inode, int block,
129                                  struct buffer_head **bh)
130 {
131         u64 pblock, pcount;
132         int err;
133
134         down_read(&OCFS2_I(inode)->ip_alloc_sem);
135         err = ocfs2_extent_map_get_blocks(inode, block, &pblock, &pcount, NULL);
136         up_read(&OCFS2_I(inode)->ip_alloc_sem);
137         if (err) {
138                 mlog_errno(err);
139                 return err;
140         }
141         *bh = sb_getblk(inode->i_sb, pblock);
142         if (!*bh) {
143                 err = -EIO;
144                 mlog_errno(err);
145         }
146         return err;;
147 }
148
149 /* Read data from global quotafile - avoid pagecache and such because we cannot
150  * afford acquiring the locks... We use quota cluster lock to serialize
151  * operations. Caller is responsible for acquiring it. */
152 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
153                          size_t len, loff_t off)
154 {
155         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
156         struct inode *gqinode = oinfo->dqi_gqinode;
157         loff_t i_size = i_size_read(gqinode);
158         int offset = off & (sb->s_blocksize - 1);
159         sector_t blk = off >> sb->s_blocksize_bits;
160         int err = 0;
161         struct buffer_head *bh;
162         size_t toread, tocopy;
163
164         if (off > i_size)
165                 return 0;
166         if (off + len > i_size)
167                 len = i_size - off;
168         toread = len;
169         while (toread > 0) {
170                 tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
171                 bh = NULL;
172                 err = ocfs2_read_quota_block(gqinode, blk, &bh);
173                 if (err) {
174                         mlog_errno(err);
175                         return err;
176                 }
177                 memcpy(data, bh->b_data + offset, tocopy);
178                 brelse(bh);
179                 offset = 0;
180                 toread -= tocopy;
181                 data += tocopy;
182                 blk++;
183         }
184         return len;
185 }
186
187 /* Write to quotafile (we know the transaction is already started and has
188  * enough credits) */
189 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
190                           const char *data, size_t len, loff_t off)
191 {
192         struct mem_dqinfo *info = sb_dqinfo(sb, type);
193         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
194         struct inode *gqinode = oinfo->dqi_gqinode;
195         int offset = off & (sb->s_blocksize - 1);
196         sector_t blk = off >> sb->s_blocksize_bits;
197         int err = 0, new = 0, ja_type;
198         struct buffer_head *bh = NULL;
199         handle_t *handle = journal_current_handle();
200
201         if (!handle) {
202                 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
203                      "because transaction was not started.\n",
204                      (unsigned long long)off, (unsigned long long)len);
205                 return -EIO;
206         }
207         if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
208                 WARN_ON(1);
209                 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
210         }
211
212         mutex_lock_nested(&gqinode->i_mutex, I_MUTEX_QUOTA);
213         if (gqinode->i_size < off + len) {
214                 down_write(&OCFS2_I(gqinode)->ip_alloc_sem);
215                 err = ocfs2_extend_no_holes(gqinode, off + len, off);
216                 up_write(&OCFS2_I(gqinode)->ip_alloc_sem);
217                 if (err < 0)
218                         goto out;
219                 err = ocfs2_simple_size_update(gqinode,
220                                                oinfo->dqi_gqi_bh,
221                                                off + len);
222                 if (err < 0)
223                         goto out;
224                 new = 1;
225         }
226         /* Not rewriting whole block? */
227         if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
228             !new) {
229                 err = ocfs2_read_quota_block(gqinode, blk, &bh);
230                 ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
231         } else {
232                 err = ocfs2_get_quota_block(gqinode, blk, &bh);
233                 ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
234         }
235         if (err) {
236                 mlog_errno(err);
237                 return err;
238         }
239         lock_buffer(bh);
240         if (new)
241                 memset(bh->b_data, 0, sb->s_blocksize);
242         memcpy(bh->b_data + offset, data, len);
243         flush_dcache_page(bh->b_page);
244         set_buffer_uptodate(bh);
245         unlock_buffer(bh);
246         ocfs2_set_buffer_uptodate(gqinode, bh);
247         err = ocfs2_journal_access_dq(handle, gqinode, bh, ja_type);
248         if (err < 0) {
249                 brelse(bh);
250                 goto out;
251         }
252         err = ocfs2_journal_dirty(handle, bh);
253         brelse(bh);
254         if (err < 0)
255                 goto out;
256 out:
257         if (err) {
258                 mutex_unlock(&gqinode->i_mutex);
259                 mlog_errno(err);
260                 return err;
261         }
262         gqinode->i_version++;
263         ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
264         mutex_unlock(&gqinode->i_mutex);
265         return len;
266 }
267
268 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
269 {
270         int status;
271         struct buffer_head *bh = NULL;
272
273         status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
274         if (status < 0)
275                 return status;
276         spin_lock(&dq_data_lock);
277         if (!oinfo->dqi_gqi_count++)
278                 oinfo->dqi_gqi_bh = bh;
279         else
280                 WARN_ON(bh != oinfo->dqi_gqi_bh);
281         spin_unlock(&dq_data_lock);
282         return 0;
283 }
284
285 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
286 {
287         ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
288         brelse(oinfo->dqi_gqi_bh);
289         spin_lock(&dq_data_lock);
290         if (!--oinfo->dqi_gqi_count)
291                 oinfo->dqi_gqi_bh = NULL;
292         spin_unlock(&dq_data_lock);
293 }
294
295 /* Read information header from global quota file */
296 int ocfs2_global_read_info(struct super_block *sb, int type)
297 {
298         struct inode *gqinode = NULL;
299         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
300                                         GROUP_QUOTA_SYSTEM_INODE };
301         struct ocfs2_global_disk_dqinfo dinfo;
302         struct mem_dqinfo *info = sb_dqinfo(sb, type);
303         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
304         int status;
305
306         mlog_entry_void();
307
308         /* Read global header */
309         gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
310                         OCFS2_INVALID_SLOT);
311         if (!gqinode) {
312                 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
313                         type);
314                 status = -EINVAL;
315                 goto out_err;
316         }
317         oinfo->dqi_gi.dqi_sb = sb;
318         oinfo->dqi_gi.dqi_type = type;
319         ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
320         oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
321         oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
322         oinfo->dqi_gqi_bh = NULL;
323         oinfo->dqi_gqi_count = 0;
324         oinfo->dqi_gqinode = gqinode;
325         status = ocfs2_lock_global_qf(oinfo, 0);
326         if (status < 0) {
327                 mlog_errno(status);
328                 goto out_err;
329         }
330         status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
331                                       sizeof(struct ocfs2_global_disk_dqinfo),
332                                       OCFS2_GLOBAL_INFO_OFF);
333         ocfs2_unlock_global_qf(oinfo, 0);
334         if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
335                 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
336                      status);
337                 if (status >= 0)
338                         status = -EIO;
339                 mlog_errno(status);
340                 goto out_err;
341         }
342         info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
343         info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
344         oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
345         oinfo->dqi_syncjiff = msecs_to_jiffies(oinfo->dqi_syncms);
346         oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
347         oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
348         oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
349         oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
350         oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
351                                                 OCFS2_QBLK_RESERVED_SPACE;
352         oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
353         INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
354         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
355                            oinfo->dqi_syncjiff);
356
357 out_err:
358         mlog_exit(status);
359         return status;
360 }
361
362 /* Write information to global quota file. Expects exlusive lock on quota
363  * file inode and quota info */
364 static int __ocfs2_global_write_info(struct super_block *sb, int type)
365 {
366         struct mem_dqinfo *info = sb_dqinfo(sb, type);
367         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
368         struct ocfs2_global_disk_dqinfo dinfo;
369         ssize_t size;
370
371         spin_lock(&dq_data_lock);
372         info->dqi_flags &= ~DQF_INFO_DIRTY;
373         dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
374         dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
375         spin_unlock(&dq_data_lock);
376         dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
377         dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
378         dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
379         dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
380         size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
381                                      sizeof(struct ocfs2_global_disk_dqinfo),
382                                      OCFS2_GLOBAL_INFO_OFF);
383         if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
384                 mlog(ML_ERROR, "Cannot write global quota info structure\n");
385                 if (size >= 0)
386                         size = -EIO;
387                 return size;
388         }
389         return 0;
390 }
391
392 int ocfs2_global_write_info(struct super_block *sb, int type)
393 {
394         int err;
395         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
396
397         err = ocfs2_qinfo_lock(info, 1);
398         if (err < 0)
399                 return err;
400         err = __ocfs2_global_write_info(sb, type);
401         ocfs2_qinfo_unlock(info, 1);
402         return err;
403 }
404
405 /* Read in information from global quota file and acquire a reference to it.
406  * dquot_acquire() has already started the transaction and locked quota file */
407 int ocfs2_global_read_dquot(struct dquot *dquot)
408 {
409         int err, err2, ex = 0;
410         struct ocfs2_mem_dqinfo *info =
411                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
412
413         err = ocfs2_qinfo_lock(info, 0);
414         if (err < 0)
415                 goto out;
416         err = qtree_read_dquot(&info->dqi_gi, dquot);
417         if (err < 0)
418                 goto out_qlock;
419         OCFS2_DQUOT(dquot)->dq_use_count++;
420         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
421         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
422         if (!dquot->dq_off) {   /* No real quota entry? */
423                 /* Upgrade to exclusive lock for allocation */
424                 err = ocfs2_qinfo_lock(info, 1);
425                 if (err < 0)
426                         goto out_qlock;
427                 ex = 1;
428         }
429         err = qtree_write_dquot(&info->dqi_gi, dquot);
430         if (ex && info_dirty(sb_dqinfo(dquot->dq_sb, dquot->dq_type))) {
431                 err2 = __ocfs2_global_write_info(dquot->dq_sb, dquot->dq_type);
432                 if (!err)
433                         err = err2;
434         }
435 out_qlock:
436         if (ex)
437                 ocfs2_qinfo_unlock(info, 1);
438         ocfs2_qinfo_unlock(info, 0);
439 out:
440         if (err < 0)
441                 mlog_errno(err);
442         return err;
443 }
444
445 /* Sync local information about quota modifications with global quota file.
446  * Caller must have started the transaction and obtained exclusive lock for
447  * global quota file inode */
448 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
449 {
450         int err, err2;
451         struct super_block *sb = dquot->dq_sb;
452         int type = dquot->dq_type;
453         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
454         struct ocfs2_global_disk_dqblk dqblk;
455         s64 spacechange, inodechange;
456         time_t olditime, oldbtime;
457
458         err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
459                                    sizeof(struct ocfs2_global_disk_dqblk),
460                                    dquot->dq_off);
461         if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
462                 if (err >= 0) {
463                         mlog(ML_ERROR, "Short read from global quota file "
464                                        "(%u read)\n", err);
465                         err = -EIO;
466                 }
467                 goto out;
468         }
469
470         /* Update space and inode usage. Get also other information from
471          * global quota file so that we don't overwrite any changes there.
472          * We are */
473         spin_lock(&dq_data_lock);
474         spacechange = dquot->dq_dqb.dqb_curspace -
475                                         OCFS2_DQUOT(dquot)->dq_origspace;
476         inodechange = dquot->dq_dqb.dqb_curinodes -
477                                         OCFS2_DQUOT(dquot)->dq_originodes;
478         olditime = dquot->dq_dqb.dqb_itime;
479         oldbtime = dquot->dq_dqb.dqb_btime;
480         ocfs2_global_disk2memdqb(dquot, &dqblk);
481         mlog(0, "Syncing global dquot %u space %lld+%lld, inodes %lld+%lld\n",
482              dquot->dq_id, dquot->dq_dqb.dqb_curspace, (long long)spacechange,
483              dquot->dq_dqb.dqb_curinodes, (long long)inodechange);
484         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
485                 dquot->dq_dqb.dqb_curspace += spacechange;
486         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
487                 dquot->dq_dqb.dqb_curinodes += inodechange;
488         /* Set properly space grace time... */
489         if (dquot->dq_dqb.dqb_bsoftlimit &&
490             dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
491                 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
492                     oldbtime > 0) {
493                         if (dquot->dq_dqb.dqb_btime > 0)
494                                 dquot->dq_dqb.dqb_btime =
495                                         min(dquot->dq_dqb.dqb_btime, oldbtime);
496                         else
497                                 dquot->dq_dqb.dqb_btime = oldbtime;
498                 }
499         } else {
500                 dquot->dq_dqb.dqb_btime = 0;
501                 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
502         }
503         /* Set properly inode grace time... */
504         if (dquot->dq_dqb.dqb_isoftlimit &&
505             dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
506                 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
507                     olditime > 0) {
508                         if (dquot->dq_dqb.dqb_itime > 0)
509                                 dquot->dq_dqb.dqb_itime =
510                                         min(dquot->dq_dqb.dqb_itime, olditime);
511                         else
512                                 dquot->dq_dqb.dqb_itime = olditime;
513                 }
514         } else {
515                 dquot->dq_dqb.dqb_itime = 0;
516                 clear_bit(DQ_INODES_B, &dquot->dq_flags);
517         }
518         /* All information is properly updated, clear the flags */
519         __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
520         __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
521         __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
522         __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
523         __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
524         __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
525         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
526         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
527         spin_unlock(&dq_data_lock);
528         err = ocfs2_qinfo_lock(info, freeing);
529         if (err < 0) {
530                 mlog(ML_ERROR, "Failed to lock quota info, loosing quota write"
531                                " (type=%d, id=%u)\n", dquot->dq_type,
532                                (unsigned)dquot->dq_id);
533                 goto out;
534         }
535         if (freeing)
536                 OCFS2_DQUOT(dquot)->dq_use_count--;
537         err = qtree_write_dquot(&info->dqi_gi, dquot);
538         if (err < 0)
539                 goto out_qlock;
540         if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
541                 err = qtree_release_dquot(&info->dqi_gi, dquot);
542                 if (info_dirty(sb_dqinfo(sb, type))) {
543                         err2 = __ocfs2_global_write_info(sb, type);
544                         if (!err)
545                                 err = err2;
546                 }
547         }
548 out_qlock:
549         ocfs2_qinfo_unlock(info, freeing);
550 out:
551         if (err < 0)
552                 mlog_errno(err);
553         return err;
554 }
555
556 /*
557  *  Functions for periodic syncing of dquots with global file
558  */
559 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
560 {
561         handle_t *handle;
562         struct super_block *sb = dquot->dq_sb;
563         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
564         struct ocfs2_super *osb = OCFS2_SB(sb);
565         int status = 0;
566
567         mlog_entry("id=%u qtype=%u type=%lu device=%s\n", dquot->dq_id,
568                    dquot->dq_type, type, sb->s_id);
569         if (type != dquot->dq_type)
570                 goto out;
571         status = ocfs2_lock_global_qf(oinfo, 1);
572         if (status < 0)
573                 goto out;
574
575         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
576         if (IS_ERR(handle)) {
577                 status = PTR_ERR(handle);
578                 mlog_errno(status);
579                 goto out_ilock;
580         }
581         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
582         status = ocfs2_sync_dquot(dquot);
583         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
584         if (status < 0)
585                 mlog_errno(status);
586         /* We have to write local structure as well... */
587         dquot_mark_dquot_dirty(dquot);
588         status = dquot_commit(dquot);
589         if (status < 0)
590                 mlog_errno(status);
591         ocfs2_commit_trans(osb, handle);
592 out_ilock:
593         ocfs2_unlock_global_qf(oinfo, 1);
594 out:
595         mlog_exit(status);
596         return status;
597 }
598
599 static void qsync_work_fn(struct work_struct *work)
600 {
601         struct ocfs2_mem_dqinfo *oinfo = container_of(work,
602                                                       struct ocfs2_mem_dqinfo,
603                                                       dqi_sync_work.work);
604         struct super_block *sb = oinfo->dqi_gqinode->i_sb;
605
606         dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
607         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
608                            oinfo->dqi_syncjiff);
609 }
610
611 /*
612  *  Wrappers for generic quota functions
613  */
614
615 static int ocfs2_write_dquot(struct dquot *dquot)
616 {
617         handle_t *handle;
618         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
619         int status = 0;
620
621         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
622
623         handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
624         if (IS_ERR(handle)) {
625                 status = PTR_ERR(handle);
626                 mlog_errno(status);
627                 goto out;
628         }
629         status = dquot_commit(dquot);
630         ocfs2_commit_trans(osb, handle);
631 out:
632         mlog_exit(status);
633         return status;
634 }
635
636 int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
637 {
638         struct ocfs2_mem_dqinfo *oinfo;
639         int features[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
640                                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA };
641
642         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, features[type]))
643                 return 0;
644
645         oinfo = sb_dqinfo(sb, type)->dqi_priv;
646         /* We modify tree, leaf block, global info, local chunk header,
647          * global and local inode */
648         return oinfo->dqi_gi.dqi_qtree_depth + 2 + 1 +
649                2 * OCFS2_INODE_UPDATE_CREDITS;
650 }
651
652 static int ocfs2_release_dquot(struct dquot *dquot)
653 {
654         handle_t *handle;
655         struct ocfs2_mem_dqinfo *oinfo =
656                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
657         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
658         int status = 0;
659
660         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
661
662         status = ocfs2_lock_global_qf(oinfo, 1);
663         if (status < 0)
664                 goto out;
665         handle = ocfs2_start_trans(osb,
666                 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
667         if (IS_ERR(handle)) {
668                 status = PTR_ERR(handle);
669                 mlog_errno(status);
670                 goto out_ilock;
671         }
672         status = dquot_release(dquot);
673         ocfs2_commit_trans(osb, handle);
674 out_ilock:
675         ocfs2_unlock_global_qf(oinfo, 1);
676 out:
677         mlog_exit(status);
678         return status;
679 }
680
681 int ocfs2_calc_qinit_credits(struct super_block *sb, int type)
682 {
683         struct ocfs2_mem_dqinfo *oinfo;
684         int features[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
685                                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA };
686         struct ocfs2_dinode *lfe, *gfe;
687
688         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, features[type]))
689                 return 0;
690
691         oinfo = sb_dqinfo(sb, type)->dqi_priv;
692         gfe = (struct ocfs2_dinode *)oinfo->dqi_gqi_bh->b_data;
693         lfe = (struct ocfs2_dinode *)oinfo->dqi_lqi_bh->b_data;
694         /* We can extend local file + global file. In local file we
695          * can modify info, chunk header block and dquot block. In
696          * global file we can modify info, tree and leaf block */
697         return ocfs2_calc_extend_credits(sb, &lfe->id2.i_list, 0) +
698                ocfs2_calc_extend_credits(sb, &gfe->id2.i_list, 0) +
699                3 + oinfo->dqi_gi.dqi_qtree_depth + 2;
700 }
701
702 static int ocfs2_acquire_dquot(struct dquot *dquot)
703 {
704         handle_t *handle;
705         struct ocfs2_mem_dqinfo *oinfo =
706                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
707         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
708         int status = 0;
709
710         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
711         /* We need an exclusive lock, because we're going to update use count
712          * and instantiate possibly new dquot structure */
713         status = ocfs2_lock_global_qf(oinfo, 1);
714         if (status < 0)
715                 goto out;
716         handle = ocfs2_start_trans(osb,
717                 ocfs2_calc_qinit_credits(dquot->dq_sb, dquot->dq_type));
718         if (IS_ERR(handle)) {
719                 status = PTR_ERR(handle);
720                 mlog_errno(status);
721                 goto out_ilock;
722         }
723         status = dquot_acquire(dquot);
724         ocfs2_commit_trans(osb, handle);
725 out_ilock:
726         ocfs2_unlock_global_qf(oinfo, 1);
727 out:
728         mlog_exit(status);
729         return status;
730 }
731
732 static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
733 {
734         unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
735                              (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
736                              (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
737                              (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
738                              (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
739                              (1 << (DQ_LASTSET_B + QIF_ITIME_B));
740         int sync = 0;
741         int status;
742         struct super_block *sb = dquot->dq_sb;
743         int type = dquot->dq_type;
744         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
745         handle_t *handle;
746         struct ocfs2_super *osb = OCFS2_SB(sb);
747
748         mlog_entry("id=%u, type=%d", dquot->dq_id, type);
749         dquot_mark_dquot_dirty(dquot);
750
751         /* In case user set some limits, sync dquot immediately to global
752          * quota file so that information propagates quicker */
753         spin_lock(&dq_data_lock);
754         if (dquot->dq_flags & mask)
755                 sync = 1;
756         spin_unlock(&dq_data_lock);
757         if (!sync) {
758                 status = ocfs2_write_dquot(dquot);
759                 goto out;
760         }
761         status = ocfs2_lock_global_qf(oinfo, 1);
762         if (status < 0)
763                 goto out;
764         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
765         if (IS_ERR(handle)) {
766                 status = PTR_ERR(handle);
767                 mlog_errno(status);
768                 goto out_ilock;
769         }
770         status = ocfs2_sync_dquot(dquot);
771         if (status < 0) {
772                 mlog_errno(status);
773                 goto out_trans;
774         }
775         /* Now write updated local dquot structure */
776         status = dquot_commit(dquot);
777 out_trans:
778         ocfs2_commit_trans(osb, handle);
779 out_ilock:
780         ocfs2_unlock_global_qf(oinfo, 1);
781 out:
782         mlog_exit(status);
783         return status;
784 }
785
786 /* This should happen only after set_dqinfo(). */
787 static int ocfs2_write_info(struct super_block *sb, int type)
788 {
789         handle_t *handle;
790         int status = 0;
791         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
792
793         mlog_entry_void();
794
795         status = ocfs2_lock_global_qf(oinfo, 1);
796         if (status < 0)
797                 goto out;
798         handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
799         if (IS_ERR(handle)) {
800                 status = PTR_ERR(handle);
801                 mlog_errno(status);
802                 goto out_ilock;
803         }
804         status = dquot_commit_info(sb, type);
805         ocfs2_commit_trans(OCFS2_SB(sb), handle);
806 out_ilock:
807         ocfs2_unlock_global_qf(oinfo, 1);
808 out:
809         mlog_exit(status);
810         return status;
811 }
812
813 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
814 {
815         struct ocfs2_dquot *dquot =
816                                 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
817
818         if (!dquot)
819                 return NULL;
820         return &dquot->dq_dquot;
821 }
822
823 static void ocfs2_destroy_dquot(struct dquot *dquot)
824 {
825         kmem_cache_free(ocfs2_dquot_cachep, dquot);
826 }
827
828 struct dquot_operations ocfs2_quota_operations = {
829         .initialize     = dquot_initialize,
830         .drop           = dquot_drop,
831         .alloc_space    = dquot_alloc_space,
832         .alloc_inode    = dquot_alloc_inode,
833         .free_space     = dquot_free_space,
834         .free_inode     = dquot_free_inode,
835         .transfer       = dquot_transfer,
836         .write_dquot    = ocfs2_write_dquot,
837         .acquire_dquot  = ocfs2_acquire_dquot,
838         .release_dquot  = ocfs2_release_dquot,
839         .mark_dirty     = ocfs2_mark_dquot_dirty,
840         .write_info     = ocfs2_write_info,
841         .alloc_dquot    = ocfs2_alloc_dquot,
842         .destroy_dquot  = ocfs2_destroy_dquot,
843 };
844
845 int ocfs2_quota_setup(void)
846 {
847         ocfs2_quota_wq = create_workqueue("o2quot");
848         if (!ocfs2_quota_wq)
849                 return -ENOMEM;
850         return 0;
851 }
852
853 void ocfs2_quota_shutdown(void)
854 {
855         if (ocfs2_quota_wq) {
856                 flush_workqueue(ocfs2_quota_wq);
857                 destroy_workqueue(ocfs2_quota_wq);
858                 ocfs2_quota_wq = NULL;
859         }
860 }