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TOMOYO Linux Cross Reference
Linux/fs/ocfs2/quota_global.c

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  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 #include <linux/llist.h>
 14 
 15 #include <cluster/masklog.h>
 16 
 17 #include "ocfs2_fs.h"
 18 #include "ocfs2.h"
 19 #include "alloc.h"
 20 #include "blockcheck.h"
 21 #include "inode.h"
 22 #include "journal.h"
 23 #include "file.h"
 24 #include "sysfile.h"
 25 #include "dlmglue.h"
 26 #include "uptodate.h"
 27 #include "super.h"
 28 #include "buffer_head_io.h"
 29 #include "quota.h"
 30 #include "ocfs2_trace.h"
 31 
 32 /*
 33  * Locking of quotas with OCFS2 is rather complex. Here are rules that
 34  * should be obeyed by all the functions:
 35  * - any write of quota structure (either to local or global file) is protected
 36  *   by dqio_mutex or dquot->dq_lock.
 37  * - any modification of global quota file holds inode cluster lock, i_mutex,
 38  *   and ip_alloc_sem of the global quota file (achieved by
 39  *   ocfs2_lock_global_qf). It also has to hold qinfo_lock.
 40  * - an allocation of new blocks for local quota file is protected by
 41  *   its ip_alloc_sem
 42  *
 43  * A rough sketch of locking dependencies (lf = local file, gf = global file):
 44  * Normal filesystem operation:
 45  *   start_trans -> dqio_mutex -> write to lf
 46  * Syncing of local and global file:
 47  *   ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock ->
 48  *     write to gf
 49  *                                                     -> write to lf
 50  * Acquire dquot for the first time:
 51  *   dq_lock -> ocfs2_lock_global_qf -> qinfo_lock -> read from gf
 52  *                                   -> alloc space for gf
 53  *                                   -> start_trans -> qinfo_lock -> write to gf
 54  *           -> ip_alloc_sem of lf -> alloc space for lf
 55  *           -> write to lf
 56  * Release last reference to dquot:
 57  *   dq_lock -> ocfs2_lock_global_qf -> start_trans -> qinfo_lock -> write to gf
 58  *           -> write to lf
 59  * Note that all the above operations also hold the inode cluster lock of lf.
 60  * Recovery:
 61  *   inode cluster lock of recovered lf
 62  *     -> read bitmaps -> ip_alloc_sem of lf
 63  *     -> ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock ->
 64  *        write to gf
 65  */
 66 
 67 static void qsync_work_fn(struct work_struct *work);
 68 
 69 static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
 70 {
 71         struct ocfs2_global_disk_dqblk *d = dp;
 72         struct mem_dqblk *m = &dquot->dq_dqb;
 73 
 74         /* Update from disk only entries not set by the admin */
 75         if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
 76                 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
 77                 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
 78         }
 79         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
 80                 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
 81         if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
 82                 m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
 83                 m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
 84         }
 85         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
 86                 m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
 87         if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
 88                 m->dqb_btime = le64_to_cpu(d->dqb_btime);
 89         if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
 90                 m->dqb_itime = le64_to_cpu(d->dqb_itime);
 91         OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
 92 }
 93 
 94 static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
 95 {
 96         struct ocfs2_global_disk_dqblk *d = dp;
 97         struct mem_dqblk *m = &dquot->dq_dqb;
 98 
 99         d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
100         d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
101         d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
102         d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
103         d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
104         d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
105         d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
106         d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
107         d->dqb_btime = cpu_to_le64(m->dqb_btime);
108         d->dqb_itime = cpu_to_le64(m->dqb_itime);
109         d->dqb_pad1 = d->dqb_pad2 = 0;
110 }
111 
112 static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
113 {
114         struct ocfs2_global_disk_dqblk *d = dp;
115         struct ocfs2_mem_dqinfo *oinfo =
116                         sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
117 
118         if (qtree_entry_unused(&oinfo->dqi_gi, dp))
119                 return 0;
120 
121         return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
122                                 le32_to_cpu(d->dqb_id)),
123                       dquot->dq_id);
124 }
125 
126 struct qtree_fmt_operations ocfs2_global_ops = {
127         .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
128         .disk2mem_dqblk = ocfs2_global_disk2memdqb,
129         .is_id = ocfs2_global_is_id,
130 };
131 
132 int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh)
133 {
134         struct ocfs2_disk_dqtrailer *dqt =
135                 ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
136 
137         trace_ocfs2_validate_quota_block((unsigned long long)bh->b_blocknr);
138 
139         BUG_ON(!buffer_uptodate(bh));
140 
141         /*
142          * If the ecc fails, we return the error but otherwise
143          * leave the filesystem running.  We know any error is
144          * local to this block.
145          */
146         return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
147 }
148 
149 int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
150                                 struct buffer_head **bhp)
151 {
152         int rc;
153 
154         *bhp = NULL;
155         rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, 1, bhp, 0,
156                                ocfs2_validate_quota_block);
157         if (rc)
158                 mlog_errno(rc);
159         return rc;
160 }
161 
162 /* Read data from global quotafile - avoid pagecache and such because we cannot
163  * afford acquiring the locks... We use quota cluster lock to serialize
164  * operations. Caller is responsible for acquiring it. */
165 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
166                          size_t len, loff_t off)
167 {
168         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
169         struct inode *gqinode = oinfo->dqi_gqinode;
170         loff_t i_size = i_size_read(gqinode);
171         int offset = off & (sb->s_blocksize - 1);
172         sector_t blk = off >> sb->s_blocksize_bits;
173         int err = 0;
174         struct buffer_head *bh;
175         size_t toread, tocopy;
176         u64 pblock = 0, pcount = 0;
177 
178         if (off > i_size)
179                 return 0;
180         if (off + len > i_size)
181                 len = i_size - off;
182         toread = len;
183         while (toread > 0) {
184                 tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
185                 if (!pcount) {
186                         err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock,
187                                                           &pcount, NULL);
188                         if (err) {
189                                 mlog_errno(err);
190                                 return err;
191                         }
192                 } else {
193                         pcount--;
194                         pblock++;
195                 }
196                 bh = NULL;
197                 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
198                 if (err) {
199                         mlog_errno(err);
200                         return err;
201                 }
202                 memcpy(data, bh->b_data + offset, tocopy);
203                 brelse(bh);
204                 offset = 0;
205                 toread -= tocopy;
206                 data += tocopy;
207                 blk++;
208         }
209         return len;
210 }
211 
212 /* Write to quotafile (we know the transaction is already started and has
213  * enough credits) */
214 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
215                           const char *data, size_t len, loff_t off)
216 {
217         struct mem_dqinfo *info = sb_dqinfo(sb, type);
218         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
219         struct inode *gqinode = oinfo->dqi_gqinode;
220         int offset = off & (sb->s_blocksize - 1);
221         sector_t blk = off >> sb->s_blocksize_bits;
222         int err = 0, new = 0, ja_type;
223         struct buffer_head *bh = NULL;
224         handle_t *handle = journal_current_handle();
225         u64 pblock, pcount;
226 
227         if (!handle) {
228                 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
229                      "because transaction was not started.\n",
230                      (unsigned long long)off, (unsigned long long)len);
231                 return -EIO;
232         }
233         if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
234                 WARN_ON(1);
235                 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
236         }
237 
238         if (i_size_read(gqinode) < off + len) {
239                 loff_t rounded_end =
240                                 ocfs2_align_bytes_to_blocks(sb, off + len);
241 
242                 /* Space is already allocated in ocfs2_acquire_dquot() */
243                 err = ocfs2_simple_size_update(gqinode,
244                                                oinfo->dqi_gqi_bh,
245                                                rounded_end);
246                 if (err < 0)
247                         goto out;
248                 new = 1;
249         }
250         err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, &pcount, NULL);
251         if (err) {
252                 mlog_errno(err);
253                 goto out;
254         }
255         /* Not rewriting whole block? */
256         if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
257             !new) {
258                 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
259                 ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
260         } else {
261                 bh = sb_getblk(sb, pblock);
262                 if (!bh)
263                         err = -ENOMEM;
264                 ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
265         }
266         if (err) {
267                 mlog_errno(err);
268                 goto out;
269         }
270         lock_buffer(bh);
271         if (new)
272                 memset(bh->b_data, 0, sb->s_blocksize);
273         memcpy(bh->b_data + offset, data, len);
274         flush_dcache_page(bh->b_page);
275         set_buffer_uptodate(bh);
276         unlock_buffer(bh);
277         ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh);
278         err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh,
279                                       ja_type);
280         if (err < 0) {
281                 brelse(bh);
282                 goto out;
283         }
284         ocfs2_journal_dirty(handle, bh);
285         brelse(bh);
286 out:
287         if (err) {
288                 mlog_errno(err);
289                 return err;
290         }
291         gqinode->i_version++;
292         ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
293         return len;
294 }
295 
296 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
297 {
298         int status;
299         struct buffer_head *bh = NULL;
300 
301         status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
302         if (status < 0)
303                 return status;
304         spin_lock(&dq_data_lock);
305         if (!oinfo->dqi_gqi_count++)
306                 oinfo->dqi_gqi_bh = bh;
307         else
308                 WARN_ON(bh != oinfo->dqi_gqi_bh);
309         spin_unlock(&dq_data_lock);
310         if (ex) {
311                 mutex_lock(&oinfo->dqi_gqinode->i_mutex);
312                 down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
313         } else {
314                 down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
315         }
316         return 0;
317 }
318 
319 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
320 {
321         if (ex) {
322                 up_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
323                 mutex_unlock(&oinfo->dqi_gqinode->i_mutex);
324         } else {
325                 up_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
326         }
327         ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
328         brelse(oinfo->dqi_gqi_bh);
329         spin_lock(&dq_data_lock);
330         if (!--oinfo->dqi_gqi_count)
331                 oinfo->dqi_gqi_bh = NULL;
332         spin_unlock(&dq_data_lock);
333 }
334 
335 /* Read information header from global quota file */
336 int ocfs2_global_read_info(struct super_block *sb, int type)
337 {
338         struct inode *gqinode = NULL;
339         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
340                                         GROUP_QUOTA_SYSTEM_INODE };
341         struct ocfs2_global_disk_dqinfo dinfo;
342         struct mem_dqinfo *info = sb_dqinfo(sb, type);
343         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
344         u64 pcount;
345         int status;
346 
347         /* Read global header */
348         gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
349                         OCFS2_INVALID_SLOT);
350         if (!gqinode) {
351                 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
352                         type);
353                 status = -EINVAL;
354                 goto out_err;
355         }
356         oinfo->dqi_gi.dqi_sb = sb;
357         oinfo->dqi_gi.dqi_type = type;
358         ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
359         oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
360         oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
361         oinfo->dqi_gqi_bh = NULL;
362         oinfo->dqi_gqi_count = 0;
363         oinfo->dqi_gqinode = gqinode;
364         status = ocfs2_lock_global_qf(oinfo, 0);
365         if (status < 0) {
366                 mlog_errno(status);
367                 goto out_err;
368         }
369 
370         status = ocfs2_extent_map_get_blocks(gqinode, 0, &oinfo->dqi_giblk,
371                                              &pcount, NULL);
372         if (status < 0)
373                 goto out_unlock;
374 
375         status = ocfs2_qinfo_lock(oinfo, 0);
376         if (status < 0)
377                 goto out_unlock;
378         status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
379                                       sizeof(struct ocfs2_global_disk_dqinfo),
380                                       OCFS2_GLOBAL_INFO_OFF);
381         ocfs2_qinfo_unlock(oinfo, 0);
382         ocfs2_unlock_global_qf(oinfo, 0);
383         if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
384                 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
385                      status);
386                 if (status >= 0)
387                         status = -EIO;
388                 mlog_errno(status);
389                 goto out_err;
390         }
391         info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
392         info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
393         oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
394         oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
395         oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
396         oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
397         oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
398         oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
399                                                 OCFS2_QBLK_RESERVED_SPACE;
400         oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
401         INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
402         schedule_delayed_work(&oinfo->dqi_sync_work,
403                               msecs_to_jiffies(oinfo->dqi_syncms));
404 
405 out_err:
406         return status;
407 out_unlock:
408         ocfs2_unlock_global_qf(oinfo, 0);
409         mlog_errno(status);
410         goto out_err;
411 }
412 
413 /* Write information to global quota file. Expects exlusive lock on quota
414  * file inode and quota info */
415 static int __ocfs2_global_write_info(struct super_block *sb, int type)
416 {
417         struct mem_dqinfo *info = sb_dqinfo(sb, type);
418         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
419         struct ocfs2_global_disk_dqinfo dinfo;
420         ssize_t size;
421 
422         spin_lock(&dq_data_lock);
423         info->dqi_flags &= ~DQF_INFO_DIRTY;
424         dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
425         dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
426         spin_unlock(&dq_data_lock);
427         dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
428         dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
429         dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
430         dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
431         size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
432                                      sizeof(struct ocfs2_global_disk_dqinfo),
433                                      OCFS2_GLOBAL_INFO_OFF);
434         if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
435                 mlog(ML_ERROR, "Cannot write global quota info structure\n");
436                 if (size >= 0)
437                         size = -EIO;
438                 return size;
439         }
440         return 0;
441 }
442 
443 int ocfs2_global_write_info(struct super_block *sb, int type)
444 {
445         int err;
446         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
447 
448         err = ocfs2_qinfo_lock(info, 1);
449         if (err < 0)
450                 return err;
451         err = __ocfs2_global_write_info(sb, type);
452         ocfs2_qinfo_unlock(info, 1);
453         return err;
454 }
455 
456 static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
457 {
458         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
459 
460         /*
461          * We may need to allocate tree blocks and a leaf block but not the
462          * root block
463          */
464         return oinfo->dqi_gi.dqi_qtree_depth;
465 }
466 
467 static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
468 {
469         /* We modify all the allocated blocks, tree root, info block and
470          * the inode */
471         return (ocfs2_global_qinit_alloc(sb, type) + 2) *
472                         OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1;
473 }
474 
475 /* Sync local information about quota modifications with global quota file.
476  * Caller must have started the transaction and obtained exclusive lock for
477  * global quota file inode */
478 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
479 {
480         int err, err2;
481         struct super_block *sb = dquot->dq_sb;
482         int type = dquot->dq_id.type;
483         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
484         struct ocfs2_global_disk_dqblk dqblk;
485         s64 spacechange, inodechange;
486         time_t olditime, oldbtime;
487 
488         err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
489                                    sizeof(struct ocfs2_global_disk_dqblk),
490                                    dquot->dq_off);
491         if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
492                 if (err >= 0) {
493                         mlog(ML_ERROR, "Short read from global quota file "
494                                        "(%u read)\n", err);
495                         err = -EIO;
496                 }
497                 goto out;
498         }
499 
500         /* Update space and inode usage. Get also other information from
501          * global quota file so that we don't overwrite any changes there.
502          * We are */
503         spin_lock(&dq_data_lock);
504         spacechange = dquot->dq_dqb.dqb_curspace -
505                                         OCFS2_DQUOT(dquot)->dq_origspace;
506         inodechange = dquot->dq_dqb.dqb_curinodes -
507                                         OCFS2_DQUOT(dquot)->dq_originodes;
508         olditime = dquot->dq_dqb.dqb_itime;
509         oldbtime = dquot->dq_dqb.dqb_btime;
510         ocfs2_global_disk2memdqb(dquot, &dqblk);
511         trace_ocfs2_sync_dquot(from_kqid(&init_user_ns, dquot->dq_id),
512                                dquot->dq_dqb.dqb_curspace,
513                                (long long)spacechange,
514                                dquot->dq_dqb.dqb_curinodes,
515                                (long long)inodechange);
516         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
517                 dquot->dq_dqb.dqb_curspace += spacechange;
518         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
519                 dquot->dq_dqb.dqb_curinodes += inodechange;
520         /* Set properly space grace time... */
521         if (dquot->dq_dqb.dqb_bsoftlimit &&
522             dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
523                 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
524                     oldbtime > 0) {
525                         if (dquot->dq_dqb.dqb_btime > 0)
526                                 dquot->dq_dqb.dqb_btime =
527                                         min(dquot->dq_dqb.dqb_btime, oldbtime);
528                         else
529                                 dquot->dq_dqb.dqb_btime = oldbtime;
530                 }
531         } else {
532                 dquot->dq_dqb.dqb_btime = 0;
533                 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
534         }
535         /* Set properly inode grace time... */
536         if (dquot->dq_dqb.dqb_isoftlimit &&
537             dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
538                 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
539                     olditime > 0) {
540                         if (dquot->dq_dqb.dqb_itime > 0)
541                                 dquot->dq_dqb.dqb_itime =
542                                         min(dquot->dq_dqb.dqb_itime, olditime);
543                         else
544                                 dquot->dq_dqb.dqb_itime = olditime;
545                 }
546         } else {
547                 dquot->dq_dqb.dqb_itime = 0;
548                 clear_bit(DQ_INODES_B, &dquot->dq_flags);
549         }
550         /* All information is properly updated, clear the flags */
551         __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
552         __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
553         __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
554         __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
555         __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
556         __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
557         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
558         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
559         spin_unlock(&dq_data_lock);
560         err = ocfs2_qinfo_lock(info, freeing);
561         if (err < 0) {
562                 mlog(ML_ERROR, "Failed to lock quota info, losing quota write"
563                                " (type=%d, id=%u)\n", dquot->dq_id.type,
564                                (unsigned)from_kqid(&init_user_ns, dquot->dq_id));
565                 goto out;
566         }
567         if (freeing)
568                 OCFS2_DQUOT(dquot)->dq_use_count--;
569         err = qtree_write_dquot(&info->dqi_gi, dquot);
570         if (err < 0)
571                 goto out_qlock;
572         if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
573                 err = qtree_release_dquot(&info->dqi_gi, dquot);
574                 if (info_dirty(sb_dqinfo(sb, type))) {
575                         err2 = __ocfs2_global_write_info(sb, type);
576                         if (!err)
577                                 err = err2;
578                 }
579         }
580 out_qlock:
581         ocfs2_qinfo_unlock(info, freeing);
582 out:
583         if (err < 0)
584                 mlog_errno(err);
585         return err;
586 }
587 
588 /*
589  *  Functions for periodic syncing of dquots with global file
590  */
591 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
592 {
593         handle_t *handle;
594         struct super_block *sb = dquot->dq_sb;
595         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
596         struct ocfs2_super *osb = OCFS2_SB(sb);
597         int status = 0;
598 
599         trace_ocfs2_sync_dquot_helper(from_kqid(&init_user_ns, dquot->dq_id),
600                                       dquot->dq_id.type,
601                                       type, sb->s_id);
602         if (type != dquot->dq_id.type)
603                 goto out;
604         status = ocfs2_lock_global_qf(oinfo, 1);
605         if (status < 0)
606                 goto out;
607 
608         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
609         if (IS_ERR(handle)) {
610                 status = PTR_ERR(handle);
611                 mlog_errno(status);
612                 goto out_ilock;
613         }
614         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
615         status = ocfs2_sync_dquot(dquot);
616         if (status < 0)
617                 mlog_errno(status);
618         /* We have to write local structure as well... */
619         status = ocfs2_local_write_dquot(dquot);
620         if (status < 0)
621                 mlog_errno(status);
622         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
623         ocfs2_commit_trans(osb, handle);
624 out_ilock:
625         ocfs2_unlock_global_qf(oinfo, 1);
626 out:
627         return status;
628 }
629 
630 static void qsync_work_fn(struct work_struct *work)
631 {
632         struct ocfs2_mem_dqinfo *oinfo = container_of(work,
633                                                       struct ocfs2_mem_dqinfo,
634                                                       dqi_sync_work.work);
635         struct super_block *sb = oinfo->dqi_gqinode->i_sb;
636 
637         dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
638         schedule_delayed_work(&oinfo->dqi_sync_work,
639                               msecs_to_jiffies(oinfo->dqi_syncms));
640 }
641 
642 /*
643  *  Wrappers for generic quota functions
644  */
645 
646 static int ocfs2_write_dquot(struct dquot *dquot)
647 {
648         handle_t *handle;
649         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
650         int status = 0;
651 
652         trace_ocfs2_write_dquot(from_kqid(&init_user_ns, dquot->dq_id),
653                                 dquot->dq_id.type);
654 
655         handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
656         if (IS_ERR(handle)) {
657                 status = PTR_ERR(handle);
658                 mlog_errno(status);
659                 goto out;
660         }
661         mutex_lock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
662         status = ocfs2_local_write_dquot(dquot);
663         mutex_unlock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
664         ocfs2_commit_trans(osb, handle);
665 out:
666         return status;
667 }
668 
669 static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
670 {
671         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
672         /*
673          * We modify tree, leaf block, global info, local chunk header,
674          * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
675          * accounts for inode update
676          */
677         return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
678                OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
679                OCFS2_QINFO_WRITE_CREDITS +
680                OCFS2_INODE_UPDATE_CREDITS;
681 }
682 
683 void ocfs2_drop_dquot_refs(struct work_struct *work)
684 {
685         struct ocfs2_super *osb = container_of(work, struct ocfs2_super,
686                                                dquot_drop_work);
687         struct llist_node *list;
688         struct ocfs2_dquot *odquot, *next_odquot;
689 
690         list = llist_del_all(&osb->dquot_drop_list);
691         llist_for_each_entry_safe(odquot, next_odquot, list, list) {
692                 /* Drop the reference we acquired in ocfs2_dquot_release() */
693                 dqput(&odquot->dq_dquot);
694         }
695 }
696 
697 /*
698  * Called when the last reference to dquot is dropped. If we are called from
699  * downconvert thread, we cannot do all the handling here because grabbing
700  * quota lock could deadlock (the node holding the quota lock could need some
701  * other cluster lock to proceed but with blocked downconvert thread we cannot
702  * release any lock).
703  */
704 static int ocfs2_release_dquot(struct dquot *dquot)
705 {
706         handle_t *handle;
707         struct ocfs2_mem_dqinfo *oinfo =
708                         sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
709         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
710         int status = 0;
711 
712         trace_ocfs2_release_dquot(from_kqid(&init_user_ns, dquot->dq_id),
713                                   dquot->dq_id.type);
714 
715         mutex_lock(&dquot->dq_lock);
716         /* Check whether we are not racing with some other dqget() */
717         if (atomic_read(&dquot->dq_count) > 1)
718                 goto out;
719         /* Running from downconvert thread? Postpone quota processing to wq */
720         if (current == osb->dc_task) {
721                 /*
722                  * Grab our own reference to dquot and queue it for delayed
723                  * dropping.  Quota code rechecks after calling
724                  * ->release_dquot() and won't free dquot structure.
725                  */
726                 dqgrab(dquot);
727                 /* First entry on list -> queue work */
728                 if (llist_add(&OCFS2_DQUOT(dquot)->list, &osb->dquot_drop_list))
729                         queue_work(ocfs2_wq, &osb->dquot_drop_work);
730                 goto out;
731         }
732         status = ocfs2_lock_global_qf(oinfo, 1);
733         if (status < 0)
734                 goto out;
735         handle = ocfs2_start_trans(osb,
736                 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_id.type));
737         if (IS_ERR(handle)) {
738                 status = PTR_ERR(handle);
739                 mlog_errno(status);
740                 goto out_ilock;
741         }
742 
743         status = ocfs2_global_release_dquot(dquot);
744         if (status < 0) {
745                 mlog_errno(status);
746                 goto out_trans;
747         }
748         status = ocfs2_local_release_dquot(handle, dquot);
749         /*
750          * If we fail here, we cannot do much as global structure is
751          * already released. So just complain...
752          */
753         if (status < 0)
754                 mlog_errno(status);
755         /*
756          * Clear dq_off so that we search for the structure in quota file next
757          * time we acquire it. The structure might be deleted and reallocated
758          * elsewhere by another node while our dquot structure is on freelist.
759          */
760         dquot->dq_off = 0;
761         clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
762 out_trans:
763         ocfs2_commit_trans(osb, handle);
764 out_ilock:
765         ocfs2_unlock_global_qf(oinfo, 1);
766 out:
767         mutex_unlock(&dquot->dq_lock);
768         if (status)
769                 mlog_errno(status);
770         return status;
771 }
772 
773 /*
774  * Read global dquot structure from disk or create it if it does
775  * not exist. Also update use count of the global structure and
776  * create structure in node-local quota file.
777  */
778 static int ocfs2_acquire_dquot(struct dquot *dquot)
779 {
780         int status = 0, err;
781         int ex = 0;
782         struct super_block *sb = dquot->dq_sb;
783         struct ocfs2_super *osb = OCFS2_SB(sb);
784         int type = dquot->dq_id.type;
785         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
786         struct inode *gqinode = info->dqi_gqinode;
787         int need_alloc = ocfs2_global_qinit_alloc(sb, type);
788         handle_t *handle;
789 
790         trace_ocfs2_acquire_dquot(from_kqid(&init_user_ns, dquot->dq_id),
791                                   type);
792         mutex_lock(&dquot->dq_lock);
793         /*
794          * We need an exclusive lock, because we're going to update use count
795          * and instantiate possibly new dquot structure
796          */
797         status = ocfs2_lock_global_qf(info, 1);
798         if (status < 0)
799                 goto out;
800         status = ocfs2_qinfo_lock(info, 0);
801         if (status < 0)
802                 goto out_dq;
803         /*
804          * We always want to read dquot structure from disk because we don't
805          * know what happened with it while it was on freelist.
806          */
807         status = qtree_read_dquot(&info->dqi_gi, dquot);
808         ocfs2_qinfo_unlock(info, 0);
809         if (status < 0)
810                 goto out_dq;
811 
812         OCFS2_DQUOT(dquot)->dq_use_count++;
813         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
814         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
815         if (!dquot->dq_off) {   /* No real quota entry? */
816                 ex = 1;
817                 /*
818                  * Add blocks to quota file before we start a transaction since
819                  * locking allocators ranks above a transaction start
820                  */
821                 WARN_ON(journal_current_handle());
822                 status = ocfs2_extend_no_holes(gqinode, NULL,
823                         i_size_read(gqinode) + (need_alloc << sb->s_blocksize_bits),
824                         i_size_read(gqinode));
825                 if (status < 0)
826                         goto out_dq;
827         }
828 
829         handle = ocfs2_start_trans(osb,
830                                    ocfs2_calc_global_qinit_credits(sb, type));
831         if (IS_ERR(handle)) {
832                 status = PTR_ERR(handle);
833                 goto out_dq;
834         }
835         status = ocfs2_qinfo_lock(info, ex);
836         if (status < 0)
837                 goto out_trans;
838         status = qtree_write_dquot(&info->dqi_gi, dquot);
839         if (ex && info_dirty(sb_dqinfo(sb, type))) {
840                 err = __ocfs2_global_write_info(sb, type);
841                 if (!status)
842                         status = err;
843         }
844         ocfs2_qinfo_unlock(info, ex);
845 out_trans:
846         ocfs2_commit_trans(osb, handle);
847 out_dq:
848         ocfs2_unlock_global_qf(info, 1);
849         if (status < 0)
850                 goto out;
851 
852         status = ocfs2_create_local_dquot(dquot);
853         if (status < 0)
854                 goto out;
855         set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
856 out:
857         mutex_unlock(&dquot->dq_lock);
858         if (status)
859                 mlog_errno(status);
860         return status;
861 }
862 
863 static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
864 {
865         unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
866                              (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
867                              (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
868                              (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
869                              (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
870                              (1 << (DQ_LASTSET_B + QIF_ITIME_B));
871         int sync = 0;
872         int status;
873         struct super_block *sb = dquot->dq_sb;
874         int type = dquot->dq_id.type;
875         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
876         handle_t *handle;
877         struct ocfs2_super *osb = OCFS2_SB(sb);
878 
879         trace_ocfs2_mark_dquot_dirty(from_kqid(&init_user_ns, dquot->dq_id),
880                                      type);
881 
882         /* In case user set some limits, sync dquot immediately to global
883          * quota file so that information propagates quicker */
884         spin_lock(&dq_data_lock);
885         if (dquot->dq_flags & mask)
886                 sync = 1;
887         spin_unlock(&dq_data_lock);
888         /* This is a slight hack but we can't afford getting global quota
889          * lock if we already have a transaction started. */
890         if (!sync || journal_current_handle()) {
891                 status = ocfs2_write_dquot(dquot);
892                 goto out;
893         }
894         status = ocfs2_lock_global_qf(oinfo, 1);
895         if (status < 0)
896                 goto out;
897         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
898         if (IS_ERR(handle)) {
899                 status = PTR_ERR(handle);
900                 mlog_errno(status);
901                 goto out_ilock;
902         }
903         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
904         status = ocfs2_sync_dquot(dquot);
905         if (status < 0) {
906                 mlog_errno(status);
907                 goto out_dlock;
908         }
909         /* Now write updated local dquot structure */
910         status = ocfs2_local_write_dquot(dquot);
911 out_dlock:
912         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
913         ocfs2_commit_trans(osb, handle);
914 out_ilock:
915         ocfs2_unlock_global_qf(oinfo, 1);
916 out:
917         if (status)
918                 mlog_errno(status);
919         return status;
920 }
921 
922 /* This should happen only after set_dqinfo(). */
923 static int ocfs2_write_info(struct super_block *sb, int type)
924 {
925         handle_t *handle;
926         int status = 0;
927         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
928 
929         status = ocfs2_lock_global_qf(oinfo, 1);
930         if (status < 0)
931                 goto out;
932         handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
933         if (IS_ERR(handle)) {
934                 status = PTR_ERR(handle);
935                 mlog_errno(status);
936                 goto out_ilock;
937         }
938         status = dquot_commit_info(sb, type);
939         ocfs2_commit_trans(OCFS2_SB(sb), handle);
940 out_ilock:
941         ocfs2_unlock_global_qf(oinfo, 1);
942 out:
943         if (status)
944                 mlog_errno(status);
945         return status;
946 }
947 
948 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
949 {
950         struct ocfs2_dquot *dquot =
951                                 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
952 
953         if (!dquot)
954                 return NULL;
955         return &dquot->dq_dquot;
956 }
957 
958 static void ocfs2_destroy_dquot(struct dquot *dquot)
959 {
960         kmem_cache_free(ocfs2_dquot_cachep, dquot);
961 }
962 
963 const struct dquot_operations ocfs2_quota_operations = {
964         /* We never make dquot dirty so .write_dquot is never called */
965         .acquire_dquot  = ocfs2_acquire_dquot,
966         .release_dquot  = ocfs2_release_dquot,
967         .mark_dirty     = ocfs2_mark_dquot_dirty,
968         .write_info     = ocfs2_write_info,
969         .alloc_dquot    = ocfs2_alloc_dquot,
970         .destroy_dquot  = ocfs2_destroy_dquot,
971 };
972 

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