~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.12-rc7 ] ~ [ linux-5.11.13 ] ~ [ linux-5.10.29 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.111 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.186 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.230 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.266 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.266 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *  Implementation of operations over global quota file
  3  */
  4 #include <linux/spinlock.h>
  5 #include <linux/fs.h>
  6 #include <linux/slab.h>
  7 #include <linux/quota.h>
  8 #include <linux/quotaops.h>
  9 #include <linux/dqblk_qtree.h>
 10 #include <linux/jiffies.h>
 11 #include <linux/writeback.h>
 12 #include <linux/workqueue.h>
 13 
 14 #include <cluster/masklog.h>
 15 
 16 #include "ocfs2_fs.h"
 17 #include "ocfs2.h"
 18 #include "alloc.h"
 19 #include "blockcheck.h"
 20 #include "inode.h"
 21 #include "journal.h"
 22 #include "file.h"
 23 #include "sysfile.h"
 24 #include "dlmglue.h"
 25 #include "uptodate.h"
 26 #include "super.h"
 27 #include "buffer_head_io.h"
 28 #include "quota.h"
 29 #include "ocfs2_trace.h"
 30 
 31 /*
 32  * Locking of quotas with OCFS2 is rather complex. Here are rules that
 33  * should be obeyed by all the functions:
 34  * - any write of quota structure (either to local or global file) is protected
 35  *   by dqio_mutex or dquot->dq_lock.
 36  * - any modification of global quota file holds inode cluster lock, i_mutex,
 37  *   and ip_alloc_sem of the global quota file (achieved by
 38  *   ocfs2_lock_global_qf). It also has to hold qinfo_lock.
 39  * - an allocation of new blocks for local quota file is protected by
 40  *   its ip_alloc_sem
 41  *
 42  * A rough sketch of locking dependencies (lf = local file, gf = global file):
 43  * Normal filesystem operation:
 44  *   start_trans -> dqio_mutex -> write to lf
 45  * Syncing of local and global file:
 46  *   ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock ->
 47  *     write to gf
 48  *                                                     -> write to lf
 49  * Acquire dquot for the first time:
 50  *   dq_lock -> ocfs2_lock_global_qf -> qinfo_lock -> read from gf
 51  *                                   -> alloc space for gf
 52  *                                   -> start_trans -> qinfo_lock -> write to gf
 53  *           -> ip_alloc_sem of lf -> alloc space for lf
 54  *           -> write to lf
 55  * Release last reference to dquot:
 56  *   dq_lock -> ocfs2_lock_global_qf -> start_trans -> qinfo_lock -> write to gf
 57  *           -> write to lf
 58  * Note that all the above operations also hold the inode cluster lock of lf.
 59  * Recovery:
 60  *   inode cluster lock of recovered lf
 61  *     -> read bitmaps -> ip_alloc_sem of lf
 62  *     -> ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock ->
 63  *        write to gf
 64  */
 65 
 66 static void qsync_work_fn(struct work_struct *work);
 67 
 68 static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
 69 {
 70         struct ocfs2_global_disk_dqblk *d = dp;
 71         struct mem_dqblk *m = &dquot->dq_dqb;
 72 
 73         /* Update from disk only entries not set by the admin */
 74         if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
 75                 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
 76                 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
 77         }
 78         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
 79                 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
 80         if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
 81                 m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
 82                 m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
 83         }
 84         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
 85                 m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
 86         if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
 87                 m->dqb_btime = le64_to_cpu(d->dqb_btime);
 88         if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
 89                 m->dqb_itime = le64_to_cpu(d->dqb_itime);
 90         OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
 91 }
 92 
 93 static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
 94 {
 95         struct ocfs2_global_disk_dqblk *d = dp;
 96         struct mem_dqblk *m = &dquot->dq_dqb;
 97 
 98         d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
 99         d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
100         d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
101         d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
102         d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
103         d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
104         d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
105         d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
106         d->dqb_btime = cpu_to_le64(m->dqb_btime);
107         d->dqb_itime = cpu_to_le64(m->dqb_itime);
108         d->dqb_pad1 = d->dqb_pad2 = 0;
109 }
110 
111 static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
112 {
113         struct ocfs2_global_disk_dqblk *d = dp;
114         struct ocfs2_mem_dqinfo *oinfo =
115                         sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
116 
117         if (qtree_entry_unused(&oinfo->dqi_gi, dp))
118                 return 0;
119 
120         return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
121                                 le32_to_cpu(d->dqb_id)),
122                       dquot->dq_id);
123 }
124 
125 struct qtree_fmt_operations ocfs2_global_ops = {
126         .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
127         .disk2mem_dqblk = ocfs2_global_disk2memdqb,
128         .is_id = ocfs2_global_is_id,
129 };
130 
131 int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh)
132 {
133         struct ocfs2_disk_dqtrailer *dqt =
134                 ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
135 
136         trace_ocfs2_validate_quota_block((unsigned long long)bh->b_blocknr);
137 
138         BUG_ON(!buffer_uptodate(bh));
139 
140         /*
141          * If the ecc fails, we return the error but otherwise
142          * leave the filesystem running.  We know any error is
143          * local to this block.
144          */
145         return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
146 }
147 
148 int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
149                                 struct buffer_head **bhp)
150 {
151         int rc;
152 
153         *bhp = NULL;
154         rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, 1, bhp, 0,
155                                ocfs2_validate_quota_block);
156         if (rc)
157                 mlog_errno(rc);
158         return rc;
159 }
160 
161 /* Read data from global quotafile - avoid pagecache and such because we cannot
162  * afford acquiring the locks... We use quota cluster lock to serialize
163  * operations. Caller is responsible for acquiring it. */
164 ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
165                          size_t len, loff_t off)
166 {
167         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
168         struct inode *gqinode = oinfo->dqi_gqinode;
169         loff_t i_size = i_size_read(gqinode);
170         int offset = off & (sb->s_blocksize - 1);
171         sector_t blk = off >> sb->s_blocksize_bits;
172         int err = 0;
173         struct buffer_head *bh;
174         size_t toread, tocopy;
175         u64 pblock = 0, pcount = 0;
176 
177         if (off > i_size)
178                 return 0;
179         if (off + len > i_size)
180                 len = i_size - off;
181         toread = len;
182         while (toread > 0) {
183                 tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
184                 if (!pcount) {
185                         err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock,
186                                                           &pcount, NULL);
187                         if (err) {
188                                 mlog_errno(err);
189                                 return err;
190                         }
191                 } else {
192                         pcount--;
193                         pblock++;
194                 }
195                 bh = NULL;
196                 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
197                 if (err) {
198                         mlog_errno(err);
199                         return err;
200                 }
201                 memcpy(data, bh->b_data + offset, tocopy);
202                 brelse(bh);
203                 offset = 0;
204                 toread -= tocopy;
205                 data += tocopy;
206                 blk++;
207         }
208         return len;
209 }
210 
211 /* Write to quotafile (we know the transaction is already started and has
212  * enough credits) */
213 ssize_t ocfs2_quota_write(struct super_block *sb, int type,
214                           const char *data, size_t len, loff_t off)
215 {
216         struct mem_dqinfo *info = sb_dqinfo(sb, type);
217         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
218         struct inode *gqinode = oinfo->dqi_gqinode;
219         int offset = off & (sb->s_blocksize - 1);
220         sector_t blk = off >> sb->s_blocksize_bits;
221         int err = 0, new = 0, ja_type;
222         struct buffer_head *bh = NULL;
223         handle_t *handle = journal_current_handle();
224         u64 pblock, pcount;
225 
226         if (!handle) {
227                 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
228                      "because transaction was not started.\n",
229                      (unsigned long long)off, (unsigned long long)len);
230                 return -EIO;
231         }
232         if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
233                 WARN_ON(1);
234                 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
235         }
236 
237         if (i_size_read(gqinode) < off + len) {
238                 loff_t rounded_end =
239                                 ocfs2_align_bytes_to_blocks(sb, off + len);
240 
241                 /* Space is already allocated in ocfs2_acquire_dquot() */
242                 err = ocfs2_simple_size_update(gqinode,
243                                                oinfo->dqi_gqi_bh,
244                                                rounded_end);
245                 if (err < 0)
246                         goto out;
247                 new = 1;
248         }
249         err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, &pcount, NULL);
250         if (err) {
251                 mlog_errno(err);
252                 goto out;
253         }
254         /* Not rewriting whole block? */
255         if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
256             !new) {
257                 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
258                 ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
259         } else {
260                 bh = sb_getblk(sb, pblock);
261                 if (!bh)
262                         err = -ENOMEM;
263                 ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
264         }
265         if (err) {
266                 mlog_errno(err);
267                 goto out;
268         }
269         lock_buffer(bh);
270         if (new)
271                 memset(bh->b_data, 0, sb->s_blocksize);
272         memcpy(bh->b_data + offset, data, len);
273         flush_dcache_page(bh->b_page);
274         set_buffer_uptodate(bh);
275         unlock_buffer(bh);
276         ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh);
277         err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh,
278                                       ja_type);
279         if (err < 0) {
280                 brelse(bh);
281                 goto out;
282         }
283         ocfs2_journal_dirty(handle, bh);
284         brelse(bh);
285 out:
286         if (err) {
287                 mlog_errno(err);
288                 return err;
289         }
290         gqinode->i_version++;
291         ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
292         return len;
293 }
294 
295 int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
296 {
297         int status;
298         struct buffer_head *bh = NULL;
299 
300         status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
301         if (status < 0)
302                 return status;
303         spin_lock(&dq_data_lock);
304         if (!oinfo->dqi_gqi_count++)
305                 oinfo->dqi_gqi_bh = bh;
306         else
307                 WARN_ON(bh != oinfo->dqi_gqi_bh);
308         spin_unlock(&dq_data_lock);
309         if (ex) {
310                 mutex_lock(&oinfo->dqi_gqinode->i_mutex);
311                 down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
312         } else {
313                 down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
314         }
315         return 0;
316 }
317 
318 void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
319 {
320         if (ex) {
321                 up_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
322                 mutex_unlock(&oinfo->dqi_gqinode->i_mutex);
323         } else {
324                 up_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
325         }
326         ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
327         brelse(oinfo->dqi_gqi_bh);
328         spin_lock(&dq_data_lock);
329         if (!--oinfo->dqi_gqi_count)
330                 oinfo->dqi_gqi_bh = NULL;
331         spin_unlock(&dq_data_lock);
332 }
333 
334 /* Read information header from global quota file */
335 int ocfs2_global_read_info(struct super_block *sb, int type)
336 {
337         struct inode *gqinode = NULL;
338         unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
339                                         GROUP_QUOTA_SYSTEM_INODE };
340         struct ocfs2_global_disk_dqinfo dinfo;
341         struct mem_dqinfo *info = sb_dqinfo(sb, type);
342         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
343         u64 pcount;
344         int status;
345 
346         /* Read global header */
347         gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
348                         OCFS2_INVALID_SLOT);
349         if (!gqinode) {
350                 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
351                         type);
352                 status = -EINVAL;
353                 goto out_err;
354         }
355         oinfo->dqi_gi.dqi_sb = sb;
356         oinfo->dqi_gi.dqi_type = type;
357         ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
358         oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
359         oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
360         oinfo->dqi_gqi_bh = NULL;
361         oinfo->dqi_gqi_count = 0;
362         oinfo->dqi_gqinode = gqinode;
363         status = ocfs2_lock_global_qf(oinfo, 0);
364         if (status < 0) {
365                 mlog_errno(status);
366                 goto out_err;
367         }
368 
369         status = ocfs2_extent_map_get_blocks(gqinode, 0, &oinfo->dqi_giblk,
370                                              &pcount, NULL);
371         if (status < 0)
372                 goto out_unlock;
373 
374         status = ocfs2_qinfo_lock(oinfo, 0);
375         if (status < 0)
376                 goto out_unlock;
377         status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
378                                       sizeof(struct ocfs2_global_disk_dqinfo),
379                                       OCFS2_GLOBAL_INFO_OFF);
380         ocfs2_qinfo_unlock(oinfo, 0);
381         ocfs2_unlock_global_qf(oinfo, 0);
382         if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
383                 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
384                      status);
385                 if (status >= 0)
386                         status = -EIO;
387                 mlog_errno(status);
388                 goto out_err;
389         }
390         info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
391         info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
392         oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
393         oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
394         oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
395         oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
396         oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
397         oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
398                                                 OCFS2_QBLK_RESERVED_SPACE;
399         oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
400         INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
401         schedule_delayed_work(&oinfo->dqi_sync_work,
402                               msecs_to_jiffies(oinfo->dqi_syncms));
403 
404 out_err:
405         return status;
406 out_unlock:
407         ocfs2_unlock_global_qf(oinfo, 0);
408         mlog_errno(status);
409         goto out_err;
410 }
411 
412 /* Write information to global quota file. Expects exlusive lock on quota
413  * file inode and quota info */
414 static int __ocfs2_global_write_info(struct super_block *sb, int type)
415 {
416         struct mem_dqinfo *info = sb_dqinfo(sb, type);
417         struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
418         struct ocfs2_global_disk_dqinfo dinfo;
419         ssize_t size;
420 
421         spin_lock(&dq_data_lock);
422         info->dqi_flags &= ~DQF_INFO_DIRTY;
423         dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
424         dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
425         spin_unlock(&dq_data_lock);
426         dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
427         dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
428         dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
429         dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
430         size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
431                                      sizeof(struct ocfs2_global_disk_dqinfo),
432                                      OCFS2_GLOBAL_INFO_OFF);
433         if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
434                 mlog(ML_ERROR, "Cannot write global quota info structure\n");
435                 if (size >= 0)
436                         size = -EIO;
437                 return size;
438         }
439         return 0;
440 }
441 
442 int ocfs2_global_write_info(struct super_block *sb, int type)
443 {
444         int err;
445         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
446 
447         err = ocfs2_qinfo_lock(info, 1);
448         if (err < 0)
449                 return err;
450         err = __ocfs2_global_write_info(sb, type);
451         ocfs2_qinfo_unlock(info, 1);
452         return err;
453 }
454 
455 static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
456 {
457         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
458 
459         /*
460          * We may need to allocate tree blocks and a leaf block but not the
461          * root block
462          */
463         return oinfo->dqi_gi.dqi_qtree_depth;
464 }
465 
466 static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
467 {
468         /* We modify all the allocated blocks, tree root, info block and
469          * the inode */
470         return (ocfs2_global_qinit_alloc(sb, type) + 2) *
471                         OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1;
472 }
473 
474 /* Sync local information about quota modifications with global quota file.
475  * Caller must have started the transaction and obtained exclusive lock for
476  * global quota file inode */
477 int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
478 {
479         int err, err2;
480         struct super_block *sb = dquot->dq_sb;
481         int type = dquot->dq_id.type;
482         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
483         struct ocfs2_global_disk_dqblk dqblk;
484         s64 spacechange, inodechange;
485         time_t olditime, oldbtime;
486 
487         err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
488                                    sizeof(struct ocfs2_global_disk_dqblk),
489                                    dquot->dq_off);
490         if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
491                 if (err >= 0) {
492                         mlog(ML_ERROR, "Short read from global quota file "
493                                        "(%u read)\n", err);
494                         err = -EIO;
495                 }
496                 goto out;
497         }
498 
499         /* Update space and inode usage. Get also other information from
500          * global quota file so that we don't overwrite any changes there.
501          * We are */
502         spin_lock(&dq_data_lock);
503         spacechange = dquot->dq_dqb.dqb_curspace -
504                                         OCFS2_DQUOT(dquot)->dq_origspace;
505         inodechange = dquot->dq_dqb.dqb_curinodes -
506                                         OCFS2_DQUOT(dquot)->dq_originodes;
507         olditime = dquot->dq_dqb.dqb_itime;
508         oldbtime = dquot->dq_dqb.dqb_btime;
509         ocfs2_global_disk2memdqb(dquot, &dqblk);
510         trace_ocfs2_sync_dquot(from_kqid(&init_user_ns, dquot->dq_id),
511                                dquot->dq_dqb.dqb_curspace,
512                                (long long)spacechange,
513                                dquot->dq_dqb.dqb_curinodes,
514                                (long long)inodechange);
515         if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
516                 dquot->dq_dqb.dqb_curspace += spacechange;
517         if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
518                 dquot->dq_dqb.dqb_curinodes += inodechange;
519         /* Set properly space grace time... */
520         if (dquot->dq_dqb.dqb_bsoftlimit &&
521             dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
522                 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
523                     oldbtime > 0) {
524                         if (dquot->dq_dqb.dqb_btime > 0)
525                                 dquot->dq_dqb.dqb_btime =
526                                         min(dquot->dq_dqb.dqb_btime, oldbtime);
527                         else
528                                 dquot->dq_dqb.dqb_btime = oldbtime;
529                 }
530         } else {
531                 dquot->dq_dqb.dqb_btime = 0;
532                 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
533         }
534         /* Set properly inode grace time... */
535         if (dquot->dq_dqb.dqb_isoftlimit &&
536             dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
537                 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
538                     olditime > 0) {
539                         if (dquot->dq_dqb.dqb_itime > 0)
540                                 dquot->dq_dqb.dqb_itime =
541                                         min(dquot->dq_dqb.dqb_itime, olditime);
542                         else
543                                 dquot->dq_dqb.dqb_itime = olditime;
544                 }
545         } else {
546                 dquot->dq_dqb.dqb_itime = 0;
547                 clear_bit(DQ_INODES_B, &dquot->dq_flags);
548         }
549         /* All information is properly updated, clear the flags */
550         __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
551         __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
552         __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
553         __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
554         __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
555         __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
556         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
557         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
558         spin_unlock(&dq_data_lock);
559         err = ocfs2_qinfo_lock(info, freeing);
560         if (err < 0) {
561                 mlog(ML_ERROR, "Failed to lock quota info, losing quota write"
562                                " (type=%d, id=%u)\n", dquot->dq_id.type,
563                                (unsigned)from_kqid(&init_user_ns, dquot->dq_id));
564                 goto out;
565         }
566         if (freeing)
567                 OCFS2_DQUOT(dquot)->dq_use_count--;
568         err = qtree_write_dquot(&info->dqi_gi, dquot);
569         if (err < 0)
570                 goto out_qlock;
571         if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
572                 err = qtree_release_dquot(&info->dqi_gi, dquot);
573                 if (info_dirty(sb_dqinfo(sb, type))) {
574                         err2 = __ocfs2_global_write_info(sb, type);
575                         if (!err)
576                                 err = err2;
577                 }
578         }
579 out_qlock:
580         ocfs2_qinfo_unlock(info, freeing);
581 out:
582         if (err < 0)
583                 mlog_errno(err);
584         return err;
585 }
586 
587 /*
588  *  Functions for periodic syncing of dquots with global file
589  */
590 static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
591 {
592         handle_t *handle;
593         struct super_block *sb = dquot->dq_sb;
594         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
595         struct ocfs2_super *osb = OCFS2_SB(sb);
596         int status = 0;
597 
598         trace_ocfs2_sync_dquot_helper(from_kqid(&init_user_ns, dquot->dq_id),
599                                       dquot->dq_id.type,
600                                       type, sb->s_id);
601         if (type != dquot->dq_id.type)
602                 goto out;
603         status = ocfs2_lock_global_qf(oinfo, 1);
604         if (status < 0)
605                 goto out;
606 
607         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
608         if (IS_ERR(handle)) {
609                 status = PTR_ERR(handle);
610                 mlog_errno(status);
611                 goto out_ilock;
612         }
613         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
614         status = ocfs2_sync_dquot(dquot);
615         if (status < 0)
616                 mlog_errno(status);
617         /* We have to write local structure as well... */
618         status = ocfs2_local_write_dquot(dquot);
619         if (status < 0)
620                 mlog_errno(status);
621         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
622         ocfs2_commit_trans(osb, handle);
623 out_ilock:
624         ocfs2_unlock_global_qf(oinfo, 1);
625 out:
626         return status;
627 }
628 
629 static void qsync_work_fn(struct work_struct *work)
630 {
631         struct ocfs2_mem_dqinfo *oinfo = container_of(work,
632                                                       struct ocfs2_mem_dqinfo,
633                                                       dqi_sync_work.work);
634         struct super_block *sb = oinfo->dqi_gqinode->i_sb;
635 
636         dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
637         schedule_delayed_work(&oinfo->dqi_sync_work,
638                               msecs_to_jiffies(oinfo->dqi_syncms));
639 }
640 
641 /*
642  *  Wrappers for generic quota functions
643  */
644 
645 static int ocfs2_write_dquot(struct dquot *dquot)
646 {
647         handle_t *handle;
648         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
649         int status = 0;
650 
651         trace_ocfs2_write_dquot(from_kqid(&init_user_ns, dquot->dq_id),
652                                 dquot->dq_id.type);
653 
654         handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
655         if (IS_ERR(handle)) {
656                 status = PTR_ERR(handle);
657                 mlog_errno(status);
658                 goto out;
659         }
660         mutex_lock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
661         status = ocfs2_local_write_dquot(dquot);
662         mutex_unlock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
663         ocfs2_commit_trans(osb, handle);
664 out:
665         return status;
666 }
667 
668 static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
669 {
670         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
671         /*
672          * We modify tree, leaf block, global info, local chunk header,
673          * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
674          * accounts for inode update
675          */
676         return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
677                OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
678                OCFS2_QINFO_WRITE_CREDITS +
679                OCFS2_INODE_UPDATE_CREDITS;
680 }
681 
682 static int ocfs2_release_dquot(struct dquot *dquot)
683 {
684         handle_t *handle;
685         struct ocfs2_mem_dqinfo *oinfo =
686                         sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
687         struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
688         int status = 0;
689 
690         trace_ocfs2_release_dquot(from_kqid(&init_user_ns, dquot->dq_id),
691                                   dquot->dq_id.type);
692 
693         mutex_lock(&dquot->dq_lock);
694         /* Check whether we are not racing with some other dqget() */
695         if (atomic_read(&dquot->dq_count) > 1)
696                 goto out;
697         status = ocfs2_lock_global_qf(oinfo, 1);
698         if (status < 0)
699                 goto out;
700         handle = ocfs2_start_trans(osb,
701                 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_id.type));
702         if (IS_ERR(handle)) {
703                 status = PTR_ERR(handle);
704                 mlog_errno(status);
705                 goto out_ilock;
706         }
707 
708         status = ocfs2_global_release_dquot(dquot);
709         if (status < 0) {
710                 mlog_errno(status);
711                 goto out_trans;
712         }
713         status = ocfs2_local_release_dquot(handle, dquot);
714         /*
715          * If we fail here, we cannot do much as global structure is
716          * already released. So just complain...
717          */
718         if (status < 0)
719                 mlog_errno(status);
720         /*
721          * Clear dq_off so that we search for the structure in quota file next
722          * time we acquire it. The structure might be deleted and reallocated
723          * elsewhere by another node while our dquot structure is on freelist.
724          */
725         dquot->dq_off = 0;
726         clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
727 out_trans:
728         ocfs2_commit_trans(osb, handle);
729 out_ilock:
730         ocfs2_unlock_global_qf(oinfo, 1);
731 out:
732         mutex_unlock(&dquot->dq_lock);
733         if (status)
734                 mlog_errno(status);
735         return status;
736 }
737 
738 /*
739  * Read global dquot structure from disk or create it if it does
740  * not exist. Also update use count of the global structure and
741  * create structure in node-local quota file.
742  */
743 static int ocfs2_acquire_dquot(struct dquot *dquot)
744 {
745         int status = 0, err;
746         int ex = 0;
747         struct super_block *sb = dquot->dq_sb;
748         struct ocfs2_super *osb = OCFS2_SB(sb);
749         int type = dquot->dq_id.type;
750         struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
751         struct inode *gqinode = info->dqi_gqinode;
752         int need_alloc = ocfs2_global_qinit_alloc(sb, type);
753         handle_t *handle;
754 
755         trace_ocfs2_acquire_dquot(from_kqid(&init_user_ns, dquot->dq_id),
756                                   type);
757         mutex_lock(&dquot->dq_lock);
758         /*
759          * We need an exclusive lock, because we're going to update use count
760          * and instantiate possibly new dquot structure
761          */
762         status = ocfs2_lock_global_qf(info, 1);
763         if (status < 0)
764                 goto out;
765         status = ocfs2_qinfo_lock(info, 0);
766         if (status < 0)
767                 goto out_dq;
768         /*
769          * We always want to read dquot structure from disk because we don't
770          * know what happened with it while it was on freelist.
771          */
772         status = qtree_read_dquot(&info->dqi_gi, dquot);
773         ocfs2_qinfo_unlock(info, 0);
774         if (status < 0)
775                 goto out_dq;
776 
777         OCFS2_DQUOT(dquot)->dq_use_count++;
778         OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
779         OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
780         if (!dquot->dq_off) {   /* No real quota entry? */
781                 ex = 1;
782                 /*
783                  * Add blocks to quota file before we start a transaction since
784                  * locking allocators ranks above a transaction start
785                  */
786                 WARN_ON(journal_current_handle());
787                 status = ocfs2_extend_no_holes(gqinode, NULL,
788                         i_size_read(gqinode) + (need_alloc << sb->s_blocksize_bits),
789                         i_size_read(gqinode));
790                 if (status < 0)
791                         goto out_dq;
792         }
793 
794         handle = ocfs2_start_trans(osb,
795                                    ocfs2_calc_global_qinit_credits(sb, type));
796         if (IS_ERR(handle)) {
797                 status = PTR_ERR(handle);
798                 goto out_dq;
799         }
800         status = ocfs2_qinfo_lock(info, ex);
801         if (status < 0)
802                 goto out_trans;
803         status = qtree_write_dquot(&info->dqi_gi, dquot);
804         if (ex && info_dirty(sb_dqinfo(sb, type))) {
805                 err = __ocfs2_global_write_info(sb, type);
806                 if (!status)
807                         status = err;
808         }
809         ocfs2_qinfo_unlock(info, ex);
810 out_trans:
811         ocfs2_commit_trans(osb, handle);
812 out_dq:
813         ocfs2_unlock_global_qf(info, 1);
814         if (status < 0)
815                 goto out;
816 
817         status = ocfs2_create_local_dquot(dquot);
818         if (status < 0)
819                 goto out;
820         set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
821 out:
822         mutex_unlock(&dquot->dq_lock);
823         if (status)
824                 mlog_errno(status);
825         return status;
826 }
827 
828 static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
829 {
830         unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
831                              (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
832                              (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
833                              (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
834                              (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
835                              (1 << (DQ_LASTSET_B + QIF_ITIME_B));
836         int sync = 0;
837         int status;
838         struct super_block *sb = dquot->dq_sb;
839         int type = dquot->dq_id.type;
840         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
841         handle_t *handle;
842         struct ocfs2_super *osb = OCFS2_SB(sb);
843 
844         trace_ocfs2_mark_dquot_dirty(from_kqid(&init_user_ns, dquot->dq_id),
845                                      type);
846 
847         /* In case user set some limits, sync dquot immediately to global
848          * quota file so that information propagates quicker */
849         spin_lock(&dq_data_lock);
850         if (dquot->dq_flags & mask)
851                 sync = 1;
852         spin_unlock(&dq_data_lock);
853         /* This is a slight hack but we can't afford getting global quota
854          * lock if we already have a transaction started. */
855         if (!sync || journal_current_handle()) {
856                 status = ocfs2_write_dquot(dquot);
857                 goto out;
858         }
859         status = ocfs2_lock_global_qf(oinfo, 1);
860         if (status < 0)
861                 goto out;
862         handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
863         if (IS_ERR(handle)) {
864                 status = PTR_ERR(handle);
865                 mlog_errno(status);
866                 goto out_ilock;
867         }
868         mutex_lock(&sb_dqopt(sb)->dqio_mutex);
869         status = ocfs2_sync_dquot(dquot);
870         if (status < 0) {
871                 mlog_errno(status);
872                 goto out_dlock;
873         }
874         /* Now write updated local dquot structure */
875         status = ocfs2_local_write_dquot(dquot);
876 out_dlock:
877         mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
878         ocfs2_commit_trans(osb, handle);
879 out_ilock:
880         ocfs2_unlock_global_qf(oinfo, 1);
881 out:
882         if (status)
883                 mlog_errno(status);
884         return status;
885 }
886 
887 /* This should happen only after set_dqinfo(). */
888 static int ocfs2_write_info(struct super_block *sb, int type)
889 {
890         handle_t *handle;
891         int status = 0;
892         struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
893 
894         status = ocfs2_lock_global_qf(oinfo, 1);
895         if (status < 0)
896                 goto out;
897         handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
898         if (IS_ERR(handle)) {
899                 status = PTR_ERR(handle);
900                 mlog_errno(status);
901                 goto out_ilock;
902         }
903         status = dquot_commit_info(sb, type);
904         ocfs2_commit_trans(OCFS2_SB(sb), handle);
905 out_ilock:
906         ocfs2_unlock_global_qf(oinfo, 1);
907 out:
908         if (status)
909                 mlog_errno(status);
910         return status;
911 }
912 
913 static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
914 {
915         struct ocfs2_dquot *dquot =
916                                 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
917 
918         if (!dquot)
919                 return NULL;
920         return &dquot->dq_dquot;
921 }
922 
923 static void ocfs2_destroy_dquot(struct dquot *dquot)
924 {
925         kmem_cache_free(ocfs2_dquot_cachep, dquot);
926 }
927 
928 const struct dquot_operations ocfs2_quota_operations = {
929         /* We never make dquot dirty so .write_dquot is never called */
930         .acquire_dquot  = ocfs2_acquire_dquot,
931         .release_dquot  = ocfs2_release_dquot,
932         .mark_dirty     = ocfs2_mark_dquot_dirty,
933         .write_info     = ocfs2_write_info,
934         .alloc_dquot    = ocfs2_alloc_dquot,
935         .destroy_dquot  = ocfs2_destroy_dquot,
936 };
937 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp