Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
[linux-3.10.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/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 "super.h"
27 #include "quota.h"
28
29 static struct workqueue_struct *ocfs2_quota_wq = NULL;
30
31 static void qsync_work_fn(struct work_struct *work);
32
33 static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
34 {
35         struct ocfs2_global_disk_dqblk *d = dp;
36         struct mem_dqblk *m = &dquot->dq_dqb;
37
38         /* Update from disk only entries not set by the admin */
39         if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
40                 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
41                 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
42         }
43         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
44                 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
45         if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
46                 m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
47                 m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
48         }
49         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
50                 m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
51         if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
52                 m->dqb_btime = le64_to_cpu(d->dqb_btime);
53         if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
54                 m->dqb_itime = le64_to_cpu(d->dqb_itime);
55         OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
56 }
57
58 static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
59 {
60         struct ocfs2_global_disk_dqblk *d = dp;
61         struct mem_dqblk *m = &dquot->dq_dqb;
62
63         d->dqb_id = cpu_to_le32(dquot->dq_id);
64         d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
65         d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
66         d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
67         d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
68         d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
69         d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
70         d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
71         d->dqb_btime = cpu_to_le64(m->dqb_btime);
72         d->dqb_itime = cpu_to_le64(m->dqb_itime);
73         d->dqb_pad1 = d->dqb_pad2 = 0;
74 }
75
76 static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
77 {
78         struct ocfs2_global_disk_dqblk *d = dp;
79         struct ocfs2_mem_dqinfo *oinfo =
80                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
81
82         if (qtree_entry_unused(&oinfo->dqi_gi, dp))
83                 return 0;
84         return le32_to_cpu(d->dqb_id) == dquot->dq_id;
85 }
86
87 struct qtree_fmt_operations ocfs2_global_ops = {
88         .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
89         .disk2mem_dqblk = ocfs2_global_disk2memdqb,
90         .is_id = ocfs2_global_is_id,
91 };
92
93 static int ocfs2_validate_quota_block(struct super_block *sb,
94                                       struct buffer_head *bh)
95 {
96         struct ocfs2_disk_dqtrailer *dqt =
97                 ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
98
99         mlog(0, "Validating quota block %llu\n",
100              (unsigned long long)bh->b_blocknr);
101
102         BUG_ON(!buffer_uptodate(bh));
103
104         /*
105          * If the ecc fails, we return the error but otherwise
106          * leave the filesystem running.  We know any error is
107          * local to this block.
108          */
109         return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
110 }
111
112 int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
113                            struct buffer_head **bh)
114 {
115         int rc = 0;
116         struct buffer_head *tmp = *bh;
117
118         if (i_size_read(inode) >> inode->i_sb->s_blocksize_bits <= v_block) {
119                 ocfs2_error(inode->i_sb,
120                             "Quota file %llu is probably corrupted! Requested "
121                             "to read block %Lu but file has size only %Lu\n",
122                             (unsigned long long)OCFS2_I(inode)->ip_blkno,
123                             (unsigned long long)v_block,
124                             (unsigned long long)i_size_read(inode));
125                 return -EIO;
126         }
127         rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, 0,
128                                     ocfs2_validate_quota_block);
129         if (rc)
130                 mlog_errno(rc);
131
132         /* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
133         if (!rc && !*bh)
134                 *bh = tmp;
135
136         return rc;
137 }
138
139 static int ocfs2_get_quota_block(struct inode *inode, int block,
140                                  struct buffer_head **bh)
141 {
142         u64 pblock, pcount;
143         int err;
144
145         down_read(&OCFS2_I(inode)->ip_alloc_sem);
146         err = ocfs2_extent_map_get_blocks(inode, block, &pblock, &pcount, NULL);
147         up_read(&OCFS2_I(inode)->ip_alloc_sem);
148         if (err) {
149                 mlog_errno(err);
150                 return err;
151         }
152         *bh = sb_getblk(inode->i_sb, pblock);
153         if (!*bh) {
154                 err = -EIO;
155                 mlog_errno(err);
156         }
157         return err;
158 }
159
160 /* Read data from global quotafile - avoid pagecache and such because we cannot
161  * afford acquiring the locks... We use quota cluster lock to serialize
162  * operations. Caller is responsible for acquiring it. */
163 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
164                          size_t len, loff_t off)
165 {
166         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
167         struct inode *gqinode = oinfo->dqi_gqinode;
168         loff_t i_size = i_size_read(gqinode);
169         int offset = off & (sb->s_blocksize - 1);
170         sector_t blk = off >> sb->s_blocksize_bits;
171         int err = 0;
172         struct buffer_head *bh;
173         size_t toread, tocopy;
174
175         if (off > i_size)
176                 return 0;
177         if (off + len > i_size)
178                 len = i_size - off;
179         toread = len;
180         while (toread > 0) {
181                 tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
182                 bh = NULL;
183                 err = ocfs2_read_quota_block(gqinode, blk, &bh);
184                 if (err) {
185                         mlog_errno(err);
186                         return err;
187                 }
188                 memcpy(data, bh->b_data + offset, tocopy);
189                 brelse(bh);
190                 offset = 0;
191                 toread -= tocopy;
192                 data += tocopy;
193                 blk++;
194         }
195         return len;
196 }
197
198 /* Write to quotafile (we know the transaction is already started and has
199  * enough credits) */
200 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
201                           const char *data, size_t len, loff_t off)
202 {
203         struct mem_dqinfo *info = sb_dqinfo(sb, type);
204         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
205         struct inode *gqinode = oinfo->dqi_gqinode;
206         int offset = off & (sb->s_blocksize - 1);
207         sector_t blk = off >> sb->s_blocksize_bits;
208         int err = 0, new = 0, ja_type;
209         struct buffer_head *bh = NULL;
210         handle_t *handle = journal_current_handle();
211
212         if (!handle) {
213                 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
214                      "because transaction was not started.\n",
215                      (unsigned long long)off, (unsigned long long)len);
216                 return -EIO;
217         }
218         if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
219                 WARN_ON(1);
220                 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
221         }
222
223         mutex_lock_nested(&gqinode->i_mutex, I_MUTEX_QUOTA);
224         if (gqinode->i_size < off + len) {
225                 loff_t rounded_end =
226                                 ocfs2_align_bytes_to_blocks(sb, off + len);
227
228                 /* Space is already allocated in ocfs2_global_read_dquot() */
229                 err = ocfs2_simple_size_update(gqinode,
230                                                oinfo->dqi_gqi_bh,
231                                                rounded_end);
232                 if (err < 0)
233                         goto out;
234                 new = 1;
235         }
236         /* Not rewriting whole block? */
237         if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
238             !new) {
239                 err = ocfs2_read_quota_block(gqinode, blk, &bh);
240                 ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
241         } else {
242                 err = ocfs2_get_quota_block(gqinode, blk, &bh);
243                 ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
244         }
245         if (err) {
246                 mlog_errno(err);
247                 goto out;
248         }
249         lock_buffer(bh);
250         if (new)
251                 memset(bh->b_data, 0, sb->s_blocksize);
252         memcpy(bh->b_data + offset, data, len);
253         flush_dcache_page(bh->b_page);
254         set_buffer_uptodate(bh);
255         unlock_buffer(bh);
256         ocfs2_set_buffer_uptodate(gqinode, bh);
257         err = ocfs2_journal_access_dq(handle, gqinode, bh, ja_type);
258         if (err < 0) {
259                 brelse(bh);
260                 goto out;
261         }
262         err = ocfs2_journal_dirty(handle, bh);
263         brelse(bh);
264         if (err < 0)
265                 goto out;
266 out:
267         if (err) {
268                 mutex_unlock(&gqinode->i_mutex);
269                 mlog_errno(err);
270                 return err;
271         }
272         gqinode->i_version++;
273         ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
274         mutex_unlock(&gqinode->i_mutex);
275         return len;
276 }
277
278 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
279 {
280         int status;
281         struct buffer_head *bh = NULL;
282
283         status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
284         if (status < 0)
285                 return status;
286         spin_lock(&dq_data_lock);
287         if (!oinfo->dqi_gqi_count++)
288                 oinfo->dqi_gqi_bh = bh;
289         else
290                 WARN_ON(bh != oinfo->dqi_gqi_bh);
291         spin_unlock(&dq_data_lock);
292         return 0;
293 }
294
295 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
296 {
297         ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
298         brelse(oinfo->dqi_gqi_bh);
299         spin_lock(&dq_data_lock);
300         if (!--oinfo->dqi_gqi_count)
301                 oinfo->dqi_gqi_bh = NULL;
302         spin_unlock(&dq_data_lock);
303 }
304
305 /* Read information header from global quota file */
306 int ocfs2_global_read_info(struct super_block *sb, int type)
307 {
308         struct inode *gqinode = NULL;
309         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
310                                         GROUP_QUOTA_SYSTEM_INODE };
311         struct ocfs2_global_disk_dqinfo dinfo;
312         struct mem_dqinfo *info = sb_dqinfo(sb, type);
313         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
314         int status;
315
316         mlog_entry_void();
317
318         /* Read global header */
319         gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
320                         OCFS2_INVALID_SLOT);
321         if (!gqinode) {
322                 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
323                         type);
324                 status = -EINVAL;
325                 goto out_err;
326         }
327         oinfo->dqi_gi.dqi_sb = sb;
328         oinfo->dqi_gi.dqi_type = type;
329         ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
330         oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
331         oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
332         oinfo->dqi_gqi_bh = NULL;
333         oinfo->dqi_gqi_count = 0;
334         oinfo->dqi_gqinode = gqinode;
335         status = ocfs2_lock_global_qf(oinfo, 0);
336         if (status < 0) {
337                 mlog_errno(status);
338                 goto out_err;
339         }
340         status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
341                                       sizeof(struct ocfs2_global_disk_dqinfo),
342                                       OCFS2_GLOBAL_INFO_OFF);
343         ocfs2_unlock_global_qf(oinfo, 0);
344         if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
345                 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
346                      status);
347                 if (status >= 0)
348                         status = -EIO;
349                 mlog_errno(status);
350                 goto out_err;
351         }
352         info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
353         info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
354         oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
355         oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
356         oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
357         oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
358         oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
359         oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
360                                                 OCFS2_QBLK_RESERVED_SPACE;
361         oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
362         INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
363         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
364                            msecs_to_jiffies(oinfo->dqi_syncms));
365
366 out_err:
367         mlog_exit(status);
368         return status;
369 }
370
371 /* Write information to global quota file. Expects exlusive lock on quota
372  * file inode and quota info */
373 static int __ocfs2_global_write_info(struct super_block *sb, int type)
374 {
375         struct mem_dqinfo *info = sb_dqinfo(sb, type);
376         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
377         struct ocfs2_global_disk_dqinfo dinfo;
378         ssize_t size;
379
380         spin_lock(&dq_data_lock);
381         info->dqi_flags &= ~DQF_INFO_DIRTY;
382         dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
383         dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
384         spin_unlock(&dq_data_lock);
385         dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
386         dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
387         dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
388         dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
389         size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
390                                      sizeof(struct ocfs2_global_disk_dqinfo),
391                                      OCFS2_GLOBAL_INFO_OFF);
392         if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
393                 mlog(ML_ERROR, "Cannot write global quota info structure\n");
394                 if (size >= 0)
395                         size = -EIO;
396                 return size;
397         }
398         return 0;
399 }
400
401 int ocfs2_global_write_info(struct super_block *sb, int type)
402 {
403         int err;
404         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
405
406         err = ocfs2_qinfo_lock(info, 1);
407         if (err < 0)
408                 return err;
409         err = __ocfs2_global_write_info(sb, type);
410         ocfs2_qinfo_unlock(info, 1);
411         return err;
412 }
413
414 static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
415 {
416         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
417
418         /*
419          * We may need to allocate tree blocks and a leaf block but not the
420          * root block
421          */
422         return oinfo->dqi_gi.dqi_qtree_depth;
423 }
424
425 static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
426 {
427         /* We modify all the allocated blocks, tree root, and info block */
428         return (ocfs2_global_qinit_alloc(sb, type) + 2) *
429                         OCFS2_QUOTA_BLOCK_UPDATE_CREDITS;
430 }
431
432 /* Read in information from global quota file and acquire a reference to it.
433  * dquot_acquire() has already started the transaction and locked quota file */
434 int ocfs2_global_read_dquot(struct dquot *dquot)
435 {
436         int err, err2, ex = 0;
437         struct super_block *sb = dquot->dq_sb;
438         int type = dquot->dq_type;
439         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
440         struct ocfs2_super *osb = OCFS2_SB(sb);
441         struct inode *gqinode = info->dqi_gqinode;
442         int need_alloc = ocfs2_global_qinit_alloc(sb, type);
443         handle_t *handle = NULL;
444
445         err = ocfs2_qinfo_lock(info, 0);
446         if (err < 0)
447                 goto out;
448         err = qtree_read_dquot(&info->dqi_gi, dquot);
449         if (err < 0)
450                 goto out_qlock;
451         OCFS2_DQUOT(dquot)->dq_use_count++;
452         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
453         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
454         ocfs2_qinfo_unlock(info, 0);
455
456         if (!dquot->dq_off) {   /* No real quota entry? */
457                 ex = 1;
458                 /*
459                  * Add blocks to quota file before we start a transaction since
460                  * locking allocators ranks above a transaction start
461                  */
462                 WARN_ON(journal_current_handle());
463                 down_write(&OCFS2_I(gqinode)->ip_alloc_sem);
464                 err = ocfs2_extend_no_holes(gqinode,
465                         gqinode->i_size + (need_alloc << sb->s_blocksize_bits),
466                         gqinode->i_size);
467                 up_write(&OCFS2_I(gqinode)->ip_alloc_sem);
468                 if (err < 0)
469                         goto out;
470         }
471
472         handle = ocfs2_start_trans(osb,
473                                    ocfs2_calc_global_qinit_credits(sb, type));
474         if (IS_ERR(handle)) {
475                 err = PTR_ERR(handle);
476                 goto out;
477         }
478         err = ocfs2_qinfo_lock(info, ex);
479         if (err < 0)
480                 goto out_trans;
481         err = qtree_write_dquot(&info->dqi_gi, dquot);
482         if (ex && info_dirty(sb_dqinfo(dquot->dq_sb, dquot->dq_type))) {
483                 err2 = __ocfs2_global_write_info(dquot->dq_sb, dquot->dq_type);
484                 if (!err)
485                         err = err2;
486         }
487 out_qlock:
488         if (ex)
489                 ocfs2_qinfo_unlock(info, 1);
490         else
491                 ocfs2_qinfo_unlock(info, 0);
492 out_trans:
493         if (handle)
494                 ocfs2_commit_trans(osb, handle);
495 out:
496         if (err < 0)
497                 mlog_errno(err);
498         return err;
499 }
500
501 /* Sync local information about quota modifications with global quota file.
502  * Caller must have started the transaction and obtained exclusive lock for
503  * global quota file inode */
504 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
505 {
506         int err, err2;
507         struct super_block *sb = dquot->dq_sb;
508         int type = dquot->dq_type;
509         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
510         struct ocfs2_global_disk_dqblk dqblk;
511         s64 spacechange, inodechange;
512         time_t olditime, oldbtime;
513
514         err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
515                                    sizeof(struct ocfs2_global_disk_dqblk),
516                                    dquot->dq_off);
517         if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
518                 if (err >= 0) {
519                         mlog(ML_ERROR, "Short read from global quota file "
520                                        "(%u read)\n", err);
521                         err = -EIO;
522                 }
523                 goto out;
524         }
525
526         /* Update space and inode usage. Get also other information from
527          * global quota file so that we don't overwrite any changes there.
528          * We are */
529         spin_lock(&dq_data_lock);
530         spacechange = dquot->dq_dqb.dqb_curspace -
531                                         OCFS2_DQUOT(dquot)->dq_origspace;
532         inodechange = dquot->dq_dqb.dqb_curinodes -
533                                         OCFS2_DQUOT(dquot)->dq_originodes;
534         olditime = dquot->dq_dqb.dqb_itime;
535         oldbtime = dquot->dq_dqb.dqb_btime;
536         ocfs2_global_disk2memdqb(dquot, &dqblk);
537         mlog(0, "Syncing global dquot %u space %lld+%lld, inodes %lld+%lld\n",
538              dquot->dq_id, dquot->dq_dqb.dqb_curspace, (long long)spacechange,
539              dquot->dq_dqb.dqb_curinodes, (long long)inodechange);
540         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
541                 dquot->dq_dqb.dqb_curspace += spacechange;
542         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
543                 dquot->dq_dqb.dqb_curinodes += inodechange;
544         /* Set properly space grace time... */
545         if (dquot->dq_dqb.dqb_bsoftlimit &&
546             dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
547                 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
548                     oldbtime > 0) {
549                         if (dquot->dq_dqb.dqb_btime > 0)
550                                 dquot->dq_dqb.dqb_btime =
551                                         min(dquot->dq_dqb.dqb_btime, oldbtime);
552                         else
553                                 dquot->dq_dqb.dqb_btime = oldbtime;
554                 }
555         } else {
556                 dquot->dq_dqb.dqb_btime = 0;
557                 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
558         }
559         /* Set properly inode grace time... */
560         if (dquot->dq_dqb.dqb_isoftlimit &&
561             dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
562                 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
563                     olditime > 0) {
564                         if (dquot->dq_dqb.dqb_itime > 0)
565                                 dquot->dq_dqb.dqb_itime =
566                                         min(dquot->dq_dqb.dqb_itime, olditime);
567                         else
568                                 dquot->dq_dqb.dqb_itime = olditime;
569                 }
570         } else {
571                 dquot->dq_dqb.dqb_itime = 0;
572                 clear_bit(DQ_INODES_B, &dquot->dq_flags);
573         }
574         /* All information is properly updated, clear the flags */
575         __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
576         __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
577         __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
578         __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
579         __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
580         __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
581         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
582         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
583         spin_unlock(&dq_data_lock);
584         err = ocfs2_qinfo_lock(info, freeing);
585         if (err < 0) {
586                 mlog(ML_ERROR, "Failed to lock quota info, loosing quota write"
587                                " (type=%d, id=%u)\n", dquot->dq_type,
588                                (unsigned)dquot->dq_id);
589                 goto out;
590         }
591         if (freeing)
592                 OCFS2_DQUOT(dquot)->dq_use_count--;
593         err = qtree_write_dquot(&info->dqi_gi, dquot);
594         if (err < 0)
595                 goto out_qlock;
596         if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
597                 err = qtree_release_dquot(&info->dqi_gi, dquot);
598                 if (info_dirty(sb_dqinfo(sb, type))) {
599                         err2 = __ocfs2_global_write_info(sb, type);
600                         if (!err)
601                                 err = err2;
602                 }
603         }
604 out_qlock:
605         ocfs2_qinfo_unlock(info, freeing);
606 out:
607         if (err < 0)
608                 mlog_errno(err);
609         return err;
610 }
611
612 /*
613  *  Functions for periodic syncing of dquots with global file
614  */
615 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
616 {
617         handle_t *handle;
618         struct super_block *sb = dquot->dq_sb;
619         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
620         struct ocfs2_super *osb = OCFS2_SB(sb);
621         int status = 0;
622
623         mlog_entry("id=%u qtype=%u type=%lu device=%s\n", dquot->dq_id,
624                    dquot->dq_type, type, sb->s_id);
625         if (type != dquot->dq_type)
626                 goto out;
627         status = ocfs2_lock_global_qf(oinfo, 1);
628         if (status < 0)
629                 goto out;
630
631         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
632         if (IS_ERR(handle)) {
633                 status = PTR_ERR(handle);
634                 mlog_errno(status);
635                 goto out_ilock;
636         }
637         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
638         status = ocfs2_sync_dquot(dquot);
639         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
640         if (status < 0)
641                 mlog_errno(status);
642         /* We have to write local structure as well... */
643         dquot_mark_dquot_dirty(dquot);
644         status = dquot_commit(dquot);
645         if (status < 0)
646                 mlog_errno(status);
647         ocfs2_commit_trans(osb, handle);
648 out_ilock:
649         ocfs2_unlock_global_qf(oinfo, 1);
650 out:
651         mlog_exit(status);
652         return status;
653 }
654
655 static void qsync_work_fn(struct work_struct *work)
656 {
657         struct ocfs2_mem_dqinfo *oinfo = container_of(work,
658                                                       struct ocfs2_mem_dqinfo,
659                                                       dqi_sync_work.work);
660         struct super_block *sb = oinfo->dqi_gqinode->i_sb;
661
662         dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
663         queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
664                            msecs_to_jiffies(oinfo->dqi_syncms));
665 }
666
667 /*
668  *  Wrappers for generic quota functions
669  */
670
671 static int ocfs2_write_dquot(struct dquot *dquot)
672 {
673         handle_t *handle;
674         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
675         int status = 0;
676
677         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
678
679         handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
680         if (IS_ERR(handle)) {
681                 status = PTR_ERR(handle);
682                 mlog_errno(status);
683                 goto out;
684         }
685         status = dquot_commit(dquot);
686         ocfs2_commit_trans(osb, handle);
687 out:
688         mlog_exit(status);
689         return status;
690 }
691
692 static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
693 {
694         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
695         /*
696          * We modify tree, leaf block, global info, local chunk header,
697          * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
698          * accounts for inode update
699          */
700         return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
701                OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
702                OCFS2_QINFO_WRITE_CREDITS +
703                OCFS2_INODE_UPDATE_CREDITS;
704 }
705
706 static int ocfs2_release_dquot(struct dquot *dquot)
707 {
708         handle_t *handle;
709         struct ocfs2_mem_dqinfo *oinfo =
710                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
711         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
712         int status = 0;
713
714         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
715
716         status = ocfs2_lock_global_qf(oinfo, 1);
717         if (status < 0)
718                 goto out;
719         handle = ocfs2_start_trans(osb,
720                 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
721         if (IS_ERR(handle)) {
722                 status = PTR_ERR(handle);
723                 mlog_errno(status);
724                 goto out_ilock;
725         }
726         status = dquot_release(dquot);
727         ocfs2_commit_trans(osb, handle);
728 out_ilock:
729         ocfs2_unlock_global_qf(oinfo, 1);
730 out:
731         mlog_exit(status);
732         return status;
733 }
734
735 static int ocfs2_acquire_dquot(struct dquot *dquot)
736 {
737         struct ocfs2_mem_dqinfo *oinfo =
738                         sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
739         int status = 0;
740
741         mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
742         /* We need an exclusive lock, because we're going to update use count
743          * and instantiate possibly new dquot structure */
744         status = ocfs2_lock_global_qf(oinfo, 1);
745         if (status < 0)
746                 goto out;
747         status = dquot_acquire(dquot);
748         ocfs2_unlock_global_qf(oinfo, 1);
749 out:
750         mlog_exit(status);
751         return status;
752 }
753
754 static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
755 {
756         unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
757                              (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
758                              (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
759                              (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
760                              (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
761                              (1 << (DQ_LASTSET_B + QIF_ITIME_B));
762         int sync = 0;
763         int status;
764         struct super_block *sb = dquot->dq_sb;
765         int type = dquot->dq_type;
766         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
767         handle_t *handle;
768         struct ocfs2_super *osb = OCFS2_SB(sb);
769
770         mlog_entry("id=%u, type=%d", dquot->dq_id, type);
771         dquot_mark_dquot_dirty(dquot);
772
773         /* In case user set some limits, sync dquot immediately to global
774          * quota file so that information propagates quicker */
775         spin_lock(&dq_data_lock);
776         if (dquot->dq_flags & mask)
777                 sync = 1;
778         spin_unlock(&dq_data_lock);
779         /* This is a slight hack but we can't afford getting global quota
780          * lock if we already have a transaction started. */
781         if (!sync || journal_current_handle()) {
782                 status = ocfs2_write_dquot(dquot);
783                 goto out;
784         }
785         status = ocfs2_lock_global_qf(oinfo, 1);
786         if (status < 0)
787                 goto out;
788         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
789         if (IS_ERR(handle)) {
790                 status = PTR_ERR(handle);
791                 mlog_errno(status);
792                 goto out_ilock;
793         }
794         status = ocfs2_sync_dquot(dquot);
795         if (status < 0) {
796                 mlog_errno(status);
797                 goto out_trans;
798         }
799         /* Now write updated local dquot structure */
800         status = dquot_commit(dquot);
801 out_trans:
802         ocfs2_commit_trans(osb, handle);
803 out_ilock:
804         ocfs2_unlock_global_qf(oinfo, 1);
805 out:
806         mlog_exit(status);
807         return status;
808 }
809
810 /* This should happen only after set_dqinfo(). */
811 static int ocfs2_write_info(struct super_block *sb, int type)
812 {
813         handle_t *handle;
814         int status = 0;
815         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
816
817         mlog_entry_void();
818
819         status = ocfs2_lock_global_qf(oinfo, 1);
820         if (status < 0)
821                 goto out;
822         handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
823         if (IS_ERR(handle)) {
824                 status = PTR_ERR(handle);
825                 mlog_errno(status);
826                 goto out_ilock;
827         }
828         status = dquot_commit_info(sb, type);
829         ocfs2_commit_trans(OCFS2_SB(sb), handle);
830 out_ilock:
831         ocfs2_unlock_global_qf(oinfo, 1);
832 out:
833         mlog_exit(status);
834         return status;
835 }
836
837 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
838 {
839         struct ocfs2_dquot *dquot =
840                                 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
841
842         if (!dquot)
843                 return NULL;
844         return &dquot->dq_dquot;
845 }
846
847 static void ocfs2_destroy_dquot(struct dquot *dquot)
848 {
849         kmem_cache_free(ocfs2_dquot_cachep, dquot);
850 }
851
852 const struct dquot_operations ocfs2_quota_operations = {
853         .initialize     = dquot_initialize,
854         .drop           = dquot_drop,
855         .alloc_space    = dquot_alloc_space,
856         .alloc_inode    = dquot_alloc_inode,
857         .free_space     = dquot_free_space,
858         .free_inode     = dquot_free_inode,
859         .transfer       = dquot_transfer,
860         .write_dquot    = ocfs2_write_dquot,
861         .acquire_dquot  = ocfs2_acquire_dquot,
862         .release_dquot  = ocfs2_release_dquot,
863         .mark_dirty     = ocfs2_mark_dquot_dirty,
864         .write_info     = ocfs2_write_info,
865         .alloc_dquot    = ocfs2_alloc_dquot,
866         .destroy_dquot  = ocfs2_destroy_dquot,
867 };
868
869 int ocfs2_quota_setup(void)
870 {
871         ocfs2_quota_wq = create_workqueue("o2quot");
872         if (!ocfs2_quota_wq)
873                 return -ENOMEM;
874         return 0;
875 }
876
877 void ocfs2_quota_shutdown(void)
878 {
879         if (ocfs2_quota_wq) {
880                 flush_workqueue(ocfs2_quota_wq);
881                 destroy_workqueue(ocfs2_quota_wq);
882                 ocfs2_quota_wq = NULL;
883         }
884 }