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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Implementation of operations over global quota file
4 */
5#include <linux/spinlock.h>
6#include <linux/fs.h>
7#include <linux/slab.h>
8#include <linux/quota.h>
9#include <linux/quotaops.h>
10#include <linux/dqblk_qtree.h>
11#include <linux/jiffies.h>
12#include <linux/writeback.h>
13#include <linux/workqueue.h>
14#include <linux/llist.h>
15#include <linux/iversion.h>
16
17#include <cluster/masklog.h>
18
19#include "ocfs2_fs.h"
20#include "ocfs2.h"
21#include "alloc.h"
22#include "blockcheck.h"
23#include "inode.h"
24#include "journal.h"
25#include "file.h"
26#include "sysfile.h"
27#include "dlmglue.h"
28#include "uptodate.h"
29#include "super.h"
30#include "buffer_head_io.h"
31#include "quota.h"
32#include "ocfs2_trace.h"
33
34/*
35 * Locking of quotas with OCFS2 is rather complex. Here are rules that
36 * should be obeyed by all the functions:
37 * - any write of quota structure (either to local or global file) is protected
38 * by dqio_sem or dquot->dq_lock.
39 * - any modification of global quota file holds inode cluster lock, i_rwsem,
40 * and ip_alloc_sem of the global quota file (achieved by
41 * ocfs2_lock_global_qf). It also has to hold qinfo_lock.
42 * - an allocation of new blocks for local quota file is protected by
43 * its ip_alloc_sem
44 *
45 * A rough sketch of locking dependencies (lf = local file, gf = global file):
46 * Normal filesystem operation:
47 * start_trans -> dqio_sem -> write to lf
48 * Syncing of local and global file:
49 * ocfs2_lock_global_qf -> start_trans -> dqio_sem -> qinfo_lock ->
50 * write to gf
51 * -> write to lf
52 * Acquire dquot for the first time:
53 * dq_lock -> ocfs2_lock_global_qf -> qinfo_lock -> read from gf
54 * -> alloc space for gf
55 * -> start_trans -> qinfo_lock -> write to gf
56 * -> ip_alloc_sem of lf -> alloc space for lf
57 * -> write to lf
58 * Release last reference to dquot:
59 * dq_lock -> ocfs2_lock_global_qf -> start_trans -> qinfo_lock -> write to gf
60 * -> write to lf
61 * Note that all the above operations also hold the inode cluster lock of lf.
62 * Recovery:
63 * inode cluster lock of recovered lf
64 * -> read bitmaps -> ip_alloc_sem of lf
65 * -> ocfs2_lock_global_qf -> start_trans -> dqio_sem -> qinfo_lock ->
66 * write to gf
67 */
68
69static void qsync_work_fn(struct work_struct *work);
70
71static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
72{
73 struct ocfs2_global_disk_dqblk *d = dp;
74 struct mem_dqblk *m = &dquot->dq_dqb;
75
76 /* Update from disk only entries not set by the admin */
77 if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
78 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
79 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
80 }
81 if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
82 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
83 if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
84 m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
85 m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
86 }
87 if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
88 m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
89 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
90 m->dqb_btime = le64_to_cpu(d->dqb_btime);
91 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
92 m->dqb_itime = le64_to_cpu(d->dqb_itime);
93 OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
94}
95
96static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
97{
98 struct ocfs2_global_disk_dqblk *d = dp;
99 struct mem_dqblk *m = &dquot->dq_dqb;
100
101 d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
102 d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
103 d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
104 d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
105 d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
106 d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
107 d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
108 d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
109 d->dqb_btime = cpu_to_le64(m->dqb_btime);
110 d->dqb_itime = cpu_to_le64(m->dqb_itime);
111 d->dqb_pad1 = d->dqb_pad2 = 0;
112}
113
114static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
115{
116 struct ocfs2_global_disk_dqblk *d = dp;
117 struct ocfs2_mem_dqinfo *oinfo =
118 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
119
120 if (qtree_entry_unused(&oinfo->dqi_gi, dp))
121 return 0;
122
123 return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
124 le32_to_cpu(d->dqb_id)),
125 dquot->dq_id);
126}
127
128const struct qtree_fmt_operations ocfs2_global_ops = {
129 .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
130 .disk2mem_dqblk = ocfs2_global_disk2memdqb,
131 .is_id = ocfs2_global_is_id,
132};
133
134int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh)
135{
136 struct ocfs2_disk_dqtrailer *dqt =
137 ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
138
139 trace_ocfs2_validate_quota_block((unsigned long long)bh->b_blocknr);
140
141 BUG_ON(!buffer_uptodate(bh));
142
143 /*
144 * If the ecc fails, we return the error but otherwise
145 * leave the filesystem running. We know any error is
146 * local to this block.
147 */
148 return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
149}
150
151int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
152 struct buffer_head **bhp)
153{
154 int rc;
155
156 *bhp = NULL;
157 rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, 1, bhp, 0,
158 ocfs2_validate_quota_block);
159 if (rc)
160 mlog_errno(rc);
161 return rc;
162}
163
164/* Read data from global quotafile - avoid pagecache and such because we cannot
165 * afford acquiring the locks... We use quota cluster lock to serialize
166 * operations. Caller is responsible for acquiring it. */
167ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
168 size_t len, loff_t off)
169{
170 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
171 struct inode *gqinode = oinfo->dqi_gqinode;
172 loff_t i_size = i_size_read(gqinode);
173 int offset = off & (sb->s_blocksize - 1);
174 sector_t blk = off >> sb->s_blocksize_bits;
175 int err = 0;
176 struct buffer_head *bh;
177 size_t toread, tocopy;
178 u64 pblock = 0, pcount = 0;
179
180 if (off > i_size)
181 return 0;
182 if (off + len > i_size)
183 len = i_size - off;
184 toread = len;
185 while (toread > 0) {
186 tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
187 if (!pcount) {
188 err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock,
189 &pcount, NULL);
190 if (err) {
191 mlog_errno(err);
192 return err;
193 }
194 } else {
195 pcount--;
196 pblock++;
197 }
198 bh = NULL;
199 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
200 if (err) {
201 mlog_errno(err);
202 return err;
203 }
204 memcpy(data, bh->b_data + offset, tocopy);
205 brelse(bh);
206 offset = 0;
207 toread -= tocopy;
208 data += tocopy;
209 blk++;
210 }
211 return len;
212}
213
214/* Write to quotafile (we know the transaction is already started and has
215 * enough credits) */
216ssize_t ocfs2_quota_write(struct super_block *sb, int type,
217 const char *data, size_t len, loff_t off)
218{
219 struct mem_dqinfo *info = sb_dqinfo(sb, type);
220 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
221 struct inode *gqinode = oinfo->dqi_gqinode;
222 int offset = off & (sb->s_blocksize - 1);
223 sector_t blk = off >> sb->s_blocksize_bits;
224 int err = 0, new = 0, ja_type;
225 struct buffer_head *bh = NULL;
226 handle_t *handle = journal_current_handle();
227 u64 pblock, pcount;
228
229 if (!handle) {
230 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
231 "because transaction was not started.\n",
232 (unsigned long long)off, (unsigned long long)len);
233 return -EIO;
234 }
235 if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
236 WARN_ON(1);
237 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
238 }
239
240 if (i_size_read(gqinode) < off + len) {
241 loff_t rounded_end =
242 ocfs2_align_bytes_to_blocks(sb, off + len);
243
244 /* Space is already allocated in ocfs2_acquire_dquot() */
245 err = ocfs2_simple_size_update(gqinode,
246 oinfo->dqi_gqi_bh,
247 rounded_end);
248 if (err < 0)
249 goto out;
250 new = 1;
251 }
252 err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, &pcount, NULL);
253 if (err) {
254 mlog_errno(err);
255 goto out;
256 }
257 /* Not rewriting whole block? */
258 if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
259 !new) {
260 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
261 ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
262 } else {
263 bh = sb_getblk(sb, pblock);
264 if (!bh)
265 err = -ENOMEM;
266 ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
267 }
268 if (err) {
269 mlog_errno(err);
270 goto out;
271 }
272 lock_buffer(bh);
273 if (new)
274 memset(bh->b_data, 0, sb->s_blocksize);
275 memcpy(bh->b_data + offset, data, len);
276 flush_dcache_page(bh->b_page);
277 set_buffer_uptodate(bh);
278 unlock_buffer(bh);
279 ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh);
280 err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh,
281 ja_type);
282 if (err < 0) {
283 brelse(bh);
284 goto out;
285 }
286 ocfs2_journal_dirty(handle, bh);
287 brelse(bh);
288out:
289 if (err) {
290 mlog_errno(err);
291 return err;
292 }
293 inode_inc_iversion(gqinode);
294 ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
295 return len;
296}
297
298int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
299{
300 int status;
301 struct buffer_head *bh = NULL;
302
303 status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
304 if (status < 0)
305 return status;
306 spin_lock(&dq_data_lock);
307 if (!oinfo->dqi_gqi_count++)
308 oinfo->dqi_gqi_bh = bh;
309 else
310 WARN_ON(bh != oinfo->dqi_gqi_bh);
311 spin_unlock(&dq_data_lock);
312 if (ex) {
313 inode_lock(oinfo->dqi_gqinode);
314 down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
315 } else {
316 down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
317 }
318 return 0;
319}
320
321void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
322{
323 if (ex) {
324 up_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
325 inode_unlock(oinfo->dqi_gqinode);
326 } else {
327 up_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
328 }
329 ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
330 brelse(oinfo->dqi_gqi_bh);
331 spin_lock(&dq_data_lock);
332 if (!--oinfo->dqi_gqi_count)
333 oinfo->dqi_gqi_bh = NULL;
334 spin_unlock(&dq_data_lock);
335}
336
337/* Read information header from global quota file */
338int ocfs2_global_read_info(struct super_block *sb, int type)
339{
340 unsigned int ino[OCFS2_MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
341 GROUP_QUOTA_SYSTEM_INODE };
342 struct ocfs2_global_disk_dqinfo dinfo;
343 struct mem_dqinfo *info = sb_dqinfo(sb, type);
344 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
345 u64 pcount;
346 int status;
347
348 oinfo->dqi_gi.dqi_sb = sb;
349 oinfo->dqi_gi.dqi_type = type;
350 ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
351 oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
352 oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
353 oinfo->dqi_gqi_bh = NULL;
354 oinfo->dqi_gqi_count = 0;
355
356 /* Read global header */
357 oinfo->dqi_gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
358 OCFS2_INVALID_SLOT);
359 if (!oinfo->dqi_gqinode) {
360 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
361 type);
362 status = -EINVAL;
363 goto out_err;
364 }
365
366 status = ocfs2_lock_global_qf(oinfo, 0);
367 if (status < 0) {
368 mlog_errno(status);
369 goto out_err;
370 }
371
372 status = ocfs2_extent_map_get_blocks(oinfo->dqi_gqinode, 0, &oinfo->dqi_giblk,
373 &pcount, NULL);
374 if (status < 0)
375 goto out_unlock;
376
377 status = ocfs2_qinfo_lock(oinfo, 0);
378 if (status < 0)
379 goto out_unlock;
380 status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
381 sizeof(struct ocfs2_global_disk_dqinfo),
382 OCFS2_GLOBAL_INFO_OFF);
383 ocfs2_qinfo_unlock(oinfo, 0);
384 ocfs2_unlock_global_qf(oinfo, 0);
385 if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
386 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
387 status);
388 if (status >= 0)
389 status = -EIO;
390 mlog_errno(status);
391 goto out_err;
392 }
393 info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
394 info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
395 oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
396 oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
397 oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
398 oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
399 oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
400 oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
401 OCFS2_QBLK_RESERVED_SPACE;
402 oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
403 INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
404 schedule_delayed_work(&oinfo->dqi_sync_work,
405 msecs_to_jiffies(oinfo->dqi_syncms));
406
407out_err:
408 return status;
409out_unlock:
410 ocfs2_unlock_global_qf(oinfo, 0);
411 mlog_errno(status);
412 goto out_err;
413}
414
415/* Write information to global quota file. Expects exclusive lock on quota
416 * file inode and quota info */
417static int __ocfs2_global_write_info(struct super_block *sb, int type)
418{
419 struct mem_dqinfo *info = sb_dqinfo(sb, type);
420 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
421 struct ocfs2_global_disk_dqinfo dinfo;
422 ssize_t size;
423
424 spin_lock(&dq_data_lock);
425 info->dqi_flags &= ~DQF_INFO_DIRTY;
426 dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
427 dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
428 spin_unlock(&dq_data_lock);
429 dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
430 dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
431 dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
432 dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
433 size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
434 sizeof(struct ocfs2_global_disk_dqinfo),
435 OCFS2_GLOBAL_INFO_OFF);
436 if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
437 mlog(ML_ERROR, "Cannot write global quota info structure\n");
438 if (size >= 0)
439 size = -EIO;
440 return size;
441 }
442 return 0;
443}
444
445int ocfs2_global_write_info(struct super_block *sb, int type)
446{
447 int err;
448 struct quota_info *dqopt = sb_dqopt(sb);
449 struct ocfs2_mem_dqinfo *info = dqopt->info[type].dqi_priv;
450
451 down_write(&dqopt->dqio_sem);
452 err = ocfs2_qinfo_lock(info, 1);
453 if (err < 0)
454 goto out_sem;
455 err = __ocfs2_global_write_info(sb, type);
456 ocfs2_qinfo_unlock(info, 1);
457out_sem:
458 up_write(&dqopt->dqio_sem);
459 return err;
460}
461
462static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
463{
464 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
465
466 /*
467 * We may need to allocate tree blocks and a leaf block but not the
468 * root block
469 */
470 return oinfo->dqi_gi.dqi_qtree_depth;
471}
472
473static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
474{
475 /* We modify all the allocated blocks, tree root, info block and
476 * the inode */
477 return (ocfs2_global_qinit_alloc(sb, type) + 2) *
478 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1;
479}
480
481/* Sync local information about quota modifications with global quota file.
482 * Caller must have started the transaction and obtained exclusive lock for
483 * global quota file inode */
484int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
485{
486 int err, err2;
487 struct super_block *sb = dquot->dq_sb;
488 int type = dquot->dq_id.type;
489 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
490 struct ocfs2_global_disk_dqblk dqblk;
491 s64 spacechange, inodechange;
492 time64_t olditime, oldbtime;
493
494 err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
495 sizeof(struct ocfs2_global_disk_dqblk),
496 dquot->dq_off);
497 if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
498 if (err >= 0) {
499 mlog(ML_ERROR, "Short read from global quota file "
500 "(%u read)\n", err);
501 err = -EIO;
502 }
503 goto out;
504 }
505
506 /* Update space and inode usage. Get also other information from
507 * global quota file so that we don't overwrite any changes there.
508 * We are */
509 spin_lock(&dquot->dq_dqb_lock);
510 spacechange = dquot->dq_dqb.dqb_curspace -
511 OCFS2_DQUOT(dquot)->dq_origspace;
512 inodechange = dquot->dq_dqb.dqb_curinodes -
513 OCFS2_DQUOT(dquot)->dq_originodes;
514 olditime = dquot->dq_dqb.dqb_itime;
515 oldbtime = dquot->dq_dqb.dqb_btime;
516 ocfs2_global_disk2memdqb(dquot, &dqblk);
517 trace_ocfs2_sync_dquot(from_kqid(&init_user_ns, dquot->dq_id),
518 dquot->dq_dqb.dqb_curspace,
519 (long long)spacechange,
520 dquot->dq_dqb.dqb_curinodes,
521 (long long)inodechange);
522 if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
523 dquot->dq_dqb.dqb_curspace += spacechange;
524 if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
525 dquot->dq_dqb.dqb_curinodes += inodechange;
526 /* Set properly space grace time... */
527 if (dquot->dq_dqb.dqb_bsoftlimit &&
528 dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
529 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
530 oldbtime > 0) {
531 if (dquot->dq_dqb.dqb_btime > 0)
532 dquot->dq_dqb.dqb_btime =
533 min(dquot->dq_dqb.dqb_btime, oldbtime);
534 else
535 dquot->dq_dqb.dqb_btime = oldbtime;
536 }
537 } else {
538 dquot->dq_dqb.dqb_btime = 0;
539 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
540 }
541 /* Set properly inode grace time... */
542 if (dquot->dq_dqb.dqb_isoftlimit &&
543 dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
544 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
545 olditime > 0) {
546 if (dquot->dq_dqb.dqb_itime > 0)
547 dquot->dq_dqb.dqb_itime =
548 min(dquot->dq_dqb.dqb_itime, olditime);
549 else
550 dquot->dq_dqb.dqb_itime = olditime;
551 }
552 } else {
553 dquot->dq_dqb.dqb_itime = 0;
554 clear_bit(DQ_INODES_B, &dquot->dq_flags);
555 }
556 /* All information is properly updated, clear the flags */
557 __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
558 __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
559 __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
560 __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
561 __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
562 __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
563 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
564 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
565 spin_unlock(&dquot->dq_dqb_lock);
566 err = ocfs2_qinfo_lock(info, freeing);
567 if (err < 0) {
568 mlog(ML_ERROR, "Failed to lock quota info, losing quota write"
569 " (type=%d, id=%u)\n", dquot->dq_id.type,
570 (unsigned)from_kqid(&init_user_ns, dquot->dq_id));
571 goto out;
572 }
573 if (freeing)
574 OCFS2_DQUOT(dquot)->dq_use_count--;
575 err = qtree_write_dquot(&info->dqi_gi, dquot);
576 if (err < 0)
577 goto out_qlock;
578 if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
579 err = qtree_release_dquot(&info->dqi_gi, dquot);
580 if (info_dirty(sb_dqinfo(sb, type))) {
581 err2 = __ocfs2_global_write_info(sb, type);
582 if (!err)
583 err = err2;
584 }
585 }
586out_qlock:
587 ocfs2_qinfo_unlock(info, freeing);
588out:
589 if (err < 0)
590 mlog_errno(err);
591 return err;
592}
593
594/*
595 * Functions for periodic syncing of dquots with global file
596 */
597static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
598{
599 handle_t *handle;
600 struct super_block *sb = dquot->dq_sb;
601 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
602 struct ocfs2_super *osb = OCFS2_SB(sb);
603 int status = 0;
604
605 trace_ocfs2_sync_dquot_helper(from_kqid(&init_user_ns, dquot->dq_id),
606 dquot->dq_id.type,
607 type, sb->s_id);
608 if (type != dquot->dq_id.type)
609 goto out;
610 status = ocfs2_lock_global_qf(oinfo, 1);
611 if (status < 0)
612 goto out;
613
614 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
615 if (IS_ERR(handle)) {
616 status = PTR_ERR(handle);
617 mlog_errno(status);
618 goto out_ilock;
619 }
620 down_write(&sb_dqopt(sb)->dqio_sem);
621 status = ocfs2_sync_dquot(dquot);
622 if (status < 0)
623 mlog_errno(status);
624 /* We have to write local structure as well... */
625 status = ocfs2_local_write_dquot(dquot);
626 if (status < 0)
627 mlog_errno(status);
628 up_write(&sb_dqopt(sb)->dqio_sem);
629 ocfs2_commit_trans(osb, handle);
630out_ilock:
631 ocfs2_unlock_global_qf(oinfo, 1);
632out:
633 return status;
634}
635
636static void qsync_work_fn(struct work_struct *work)
637{
638 struct ocfs2_mem_dqinfo *oinfo = container_of(work,
639 struct ocfs2_mem_dqinfo,
640 dqi_sync_work.work);
641 struct super_block *sb = oinfo->dqi_gqinode->i_sb;
642
643 /*
644 * We have to be careful here not to deadlock on s_umount as umount
645 * disabling quotas may be in progress and it waits for this work to
646 * complete. If trylock fails, we'll do the sync next time...
647 */
648 if (down_read_trylock(&sb->s_umount)) {
649 dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
650 up_read(&sb->s_umount);
651 }
652 schedule_delayed_work(&oinfo->dqi_sync_work,
653 msecs_to_jiffies(oinfo->dqi_syncms));
654}
655
656/*
657 * Wrappers for generic quota functions
658 */
659
660static int ocfs2_write_dquot(struct dquot *dquot)
661{
662 handle_t *handle;
663 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
664 int status = 0;
665
666 trace_ocfs2_write_dquot(from_kqid(&init_user_ns, dquot->dq_id),
667 dquot->dq_id.type);
668
669 handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
670 if (IS_ERR(handle)) {
671 status = PTR_ERR(handle);
672 mlog_errno(status);
673 goto out;
674 }
675 down_write(&sb_dqopt(dquot->dq_sb)->dqio_sem);
676 status = ocfs2_local_write_dquot(dquot);
677 up_write(&sb_dqopt(dquot->dq_sb)->dqio_sem);
678 ocfs2_commit_trans(osb, handle);
679out:
680 return status;
681}
682
683static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
684{
685 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
686 /*
687 * We modify tree, leaf block, global info, local chunk header,
688 * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
689 * accounts for inode update
690 */
691 return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
692 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
693 OCFS2_QINFO_WRITE_CREDITS +
694 OCFS2_INODE_UPDATE_CREDITS;
695}
696
697void ocfs2_drop_dquot_refs(struct work_struct *work)
698{
699 struct ocfs2_super *osb = container_of(work, struct ocfs2_super,
700 dquot_drop_work);
701 struct llist_node *list;
702 struct ocfs2_dquot *odquot, *next_odquot;
703
704 list = llist_del_all(&osb->dquot_drop_list);
705 llist_for_each_entry_safe(odquot, next_odquot, list, list) {
706 /* Drop the reference we acquired in ocfs2_dquot_release() */
707 dqput(&odquot->dq_dquot);
708 }
709}
710
711/*
712 * Called when the last reference to dquot is dropped. If we are called from
713 * downconvert thread, we cannot do all the handling here because grabbing
714 * quota lock could deadlock (the node holding the quota lock could need some
715 * other cluster lock to proceed but with blocked downconvert thread we cannot
716 * release any lock).
717 */
718static int ocfs2_release_dquot(struct dquot *dquot)
719{
720 handle_t *handle;
721 struct ocfs2_mem_dqinfo *oinfo =
722 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
723 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
724 int status = 0;
725
726 trace_ocfs2_release_dquot(from_kqid(&init_user_ns, dquot->dq_id),
727 dquot->dq_id.type);
728
729 mutex_lock(&dquot->dq_lock);
730 /* Check whether we are not racing with some other dqget() */
731 if (dquot_is_busy(dquot))
732 goto out;
733 /* Running from downconvert thread? Postpone quota processing to wq */
734 if (current == osb->dc_task) {
735 /*
736 * Grab our own reference to dquot and queue it for delayed
737 * dropping. Quota code rechecks after calling
738 * ->release_dquot() and won't free dquot structure.
739 */
740 dqgrab(dquot);
741 /* First entry on list -> queue work */
742 if (llist_add(&OCFS2_DQUOT(dquot)->list, &osb->dquot_drop_list))
743 queue_work(osb->ocfs2_wq, &osb->dquot_drop_work);
744 goto out;
745 }
746 status = ocfs2_lock_global_qf(oinfo, 1);
747 if (status < 0)
748 goto out;
749 handle = ocfs2_start_trans(osb,
750 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_id.type));
751 if (IS_ERR(handle)) {
752 status = PTR_ERR(handle);
753 mlog_errno(status);
754 goto out_ilock;
755 }
756
757 status = ocfs2_global_release_dquot(dquot);
758 if (status < 0) {
759 mlog_errno(status);
760 goto out_trans;
761 }
762 status = ocfs2_local_release_dquot(handle, dquot);
763 /*
764 * If we fail here, we cannot do much as global structure is
765 * already released. So just complain...
766 */
767 if (status < 0)
768 mlog_errno(status);
769 /*
770 * Clear dq_off so that we search for the structure in quota file next
771 * time we acquire it. The structure might be deleted and reallocated
772 * elsewhere by another node while our dquot structure is on freelist.
773 */
774 dquot->dq_off = 0;
775 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
776out_trans:
777 ocfs2_commit_trans(osb, handle);
778out_ilock:
779 ocfs2_unlock_global_qf(oinfo, 1);
780out:
781 mutex_unlock(&dquot->dq_lock);
782 if (status)
783 mlog_errno(status);
784 return status;
785}
786
787/*
788 * Read global dquot structure from disk or create it if it does
789 * not exist. Also update use count of the global structure and
790 * create structure in node-local quota file.
791 */
792static int ocfs2_acquire_dquot(struct dquot *dquot)
793{
794 int status = 0, err;
795 int ex = 0;
796 struct super_block *sb = dquot->dq_sb;
797 struct ocfs2_super *osb = OCFS2_SB(sb);
798 int type = dquot->dq_id.type;
799 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
800 struct inode *gqinode = info->dqi_gqinode;
801 int need_alloc = ocfs2_global_qinit_alloc(sb, type);
802 handle_t *handle;
803
804 trace_ocfs2_acquire_dquot(from_kqid(&init_user_ns, dquot->dq_id),
805 type);
806 mutex_lock(&dquot->dq_lock);
807 /*
808 * We need an exclusive lock, because we're going to update use count
809 * and instantiate possibly new dquot structure
810 */
811 status = ocfs2_lock_global_qf(info, 1);
812 if (status < 0)
813 goto out;
814 status = ocfs2_qinfo_lock(info, 0);
815 if (status < 0)
816 goto out_dq;
817 /*
818 * We always want to read dquot structure from disk because we don't
819 * know what happened with it while it was on freelist.
820 */
821 status = qtree_read_dquot(&info->dqi_gi, dquot);
822 ocfs2_qinfo_unlock(info, 0);
823 if (status < 0)
824 goto out_dq;
825
826 OCFS2_DQUOT(dquot)->dq_use_count++;
827 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
828 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
829 if (!dquot->dq_off) { /* No real quota entry? */
830 ex = 1;
831 /*
832 * Add blocks to quota file before we start a transaction since
833 * locking allocators ranks above a transaction start
834 */
835 WARN_ON(journal_current_handle());
836 status = ocfs2_extend_no_holes(gqinode, NULL,
837 i_size_read(gqinode) + (need_alloc << sb->s_blocksize_bits),
838 i_size_read(gqinode));
839 if (status < 0)
840 goto out_dq;
841 }
842
843 handle = ocfs2_start_trans(osb,
844 ocfs2_calc_global_qinit_credits(sb, type));
845 if (IS_ERR(handle)) {
846 status = PTR_ERR(handle);
847 goto out_dq;
848 }
849 status = ocfs2_qinfo_lock(info, ex);
850 if (status < 0)
851 goto out_trans;
852 status = qtree_write_dquot(&info->dqi_gi, dquot);
853 if (ex && info_dirty(sb_dqinfo(sb, type))) {
854 err = __ocfs2_global_write_info(sb, type);
855 if (!status)
856 status = err;
857 }
858 ocfs2_qinfo_unlock(info, ex);
859out_trans:
860 ocfs2_commit_trans(osb, handle);
861out_dq:
862 ocfs2_unlock_global_qf(info, 1);
863 if (status < 0)
864 goto out;
865
866 status = ocfs2_create_local_dquot(dquot);
867 if (status < 0)
868 goto out;
869 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
870out:
871 mutex_unlock(&dquot->dq_lock);
872 if (status)
873 mlog_errno(status);
874 return status;
875}
876
877static int ocfs2_get_next_id(struct super_block *sb, struct kqid *qid)
878{
879 int type = qid->type;
880 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
881 int status = 0;
882
883 trace_ocfs2_get_next_id(from_kqid(&init_user_ns, *qid), type);
884 if (!sb_has_quota_loaded(sb, type)) {
885 status = -ESRCH;
886 goto out;
887 }
888 status = ocfs2_lock_global_qf(info, 0);
889 if (status < 0)
890 goto out;
891 status = ocfs2_qinfo_lock(info, 0);
892 if (status < 0)
893 goto out_global;
894 status = qtree_get_next_id(&info->dqi_gi, qid);
895 ocfs2_qinfo_unlock(info, 0);
896out_global:
897 ocfs2_unlock_global_qf(info, 0);
898out:
899 /*
900 * Avoid logging ENOENT since it just means there isn't next ID and
901 * ESRCH which means quota isn't enabled for the filesystem.
902 */
903 if (status && status != -ENOENT && status != -ESRCH)
904 mlog_errno(status);
905 return status;
906}
907
908static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
909{
910 unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
911 (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
912 (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
913 (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
914 (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
915 (1 << (DQ_LASTSET_B + QIF_ITIME_B));
916 int sync = 0;
917 int status;
918 struct super_block *sb = dquot->dq_sb;
919 int type = dquot->dq_id.type;
920 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
921 handle_t *handle;
922 struct ocfs2_super *osb = OCFS2_SB(sb);
923
924 trace_ocfs2_mark_dquot_dirty(from_kqid(&init_user_ns, dquot->dq_id),
925 type);
926
927 /* In case user set some limits, sync dquot immediately to global
928 * quota file so that information propagates quicker */
929 spin_lock(&dquot->dq_dqb_lock);
930 if (dquot->dq_flags & mask)
931 sync = 1;
932 spin_unlock(&dquot->dq_dqb_lock);
933 /* This is a slight hack but we can't afford getting global quota
934 * lock if we already have a transaction started. */
935 if (!sync || journal_current_handle()) {
936 status = ocfs2_write_dquot(dquot);
937 goto out;
938 }
939 status = ocfs2_lock_global_qf(oinfo, 1);
940 if (status < 0)
941 goto out;
942 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
943 if (IS_ERR(handle)) {
944 status = PTR_ERR(handle);
945 mlog_errno(status);
946 goto out_ilock;
947 }
948 down_write(&sb_dqopt(sb)->dqio_sem);
949 status = ocfs2_sync_dquot(dquot);
950 if (status < 0) {
951 mlog_errno(status);
952 goto out_dlock;
953 }
954 /* Now write updated local dquot structure */
955 status = ocfs2_local_write_dquot(dquot);
956out_dlock:
957 up_write(&sb_dqopt(sb)->dqio_sem);
958 ocfs2_commit_trans(osb, handle);
959out_ilock:
960 ocfs2_unlock_global_qf(oinfo, 1);
961out:
962 if (status)
963 mlog_errno(status);
964 return status;
965}
966
967/* This should happen only after set_dqinfo(). */
968static int ocfs2_write_info(struct super_block *sb, int type)
969{
970 handle_t *handle;
971 int status = 0;
972 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
973
974 status = ocfs2_lock_global_qf(oinfo, 1);
975 if (status < 0)
976 goto out;
977 handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
978 if (IS_ERR(handle)) {
979 status = PTR_ERR(handle);
980 mlog_errno(status);
981 goto out_ilock;
982 }
983 status = dquot_commit_info(sb, type);
984 ocfs2_commit_trans(OCFS2_SB(sb), handle);
985out_ilock:
986 ocfs2_unlock_global_qf(oinfo, 1);
987out:
988 if (status)
989 mlog_errno(status);
990 return status;
991}
992
993static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
994{
995 struct ocfs2_dquot *dquot =
996 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
997
998 if (!dquot)
999 return NULL;
1000 return &dquot->dq_dquot;
1001}
1002
1003static void ocfs2_destroy_dquot(struct dquot *dquot)
1004{
1005 kmem_cache_free(ocfs2_dquot_cachep, dquot);
1006}
1007
1008const struct dquot_operations ocfs2_quota_operations = {
1009 /* We never make dquot dirty so .write_dquot is never called */
1010 .acquire_dquot = ocfs2_acquire_dquot,
1011 .release_dquot = ocfs2_release_dquot,
1012 .mark_dirty = ocfs2_mark_dquot_dirty,
1013 .write_info = ocfs2_write_info,
1014 .alloc_dquot = ocfs2_alloc_dquot,
1015 .destroy_dquot = ocfs2_destroy_dquot,
1016 .get_next_id = ocfs2_get_next_id,
1017};
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
66static void qsync_work_fn(struct work_struct *work);
67
68static 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
93static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
94{
95 struct ocfs2_global_disk_dqblk *d = dp;
96 struct mem_dqblk *m = &dquot->dq_dqb;
97
98 d->dqb_id = cpu_to_le32(dquot->dq_id);
99 d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
100 d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
101 d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
102 d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
103 d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
104 d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
105 d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
106 d->dqb_btime = cpu_to_le64(m->dqb_btime);
107 d->dqb_itime = cpu_to_le64(m->dqb_itime);
108 d->dqb_pad1 = d->dqb_pad2 = 0;
109}
110
111static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
112{
113 struct ocfs2_global_disk_dqblk *d = dp;
114 struct ocfs2_mem_dqinfo *oinfo =
115 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
116
117 if (qtree_entry_unused(&oinfo->dqi_gi, dp))
118 return 0;
119 return le32_to_cpu(d->dqb_id) == dquot->dq_id;
120}
121
122struct qtree_fmt_operations ocfs2_global_ops = {
123 .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
124 .disk2mem_dqblk = ocfs2_global_disk2memdqb,
125 .is_id = ocfs2_global_is_id,
126};
127
128int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh)
129{
130 struct ocfs2_disk_dqtrailer *dqt =
131 ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
132
133 trace_ocfs2_validate_quota_block((unsigned long long)bh->b_blocknr);
134
135 BUG_ON(!buffer_uptodate(bh));
136
137 /*
138 * If the ecc fails, we return the error but otherwise
139 * leave the filesystem running. We know any error is
140 * local to this block.
141 */
142 return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
143}
144
145int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
146 struct buffer_head **bhp)
147{
148 int rc;
149
150 *bhp = NULL;
151 rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, 1, bhp, 0,
152 ocfs2_validate_quota_block);
153 if (rc)
154 mlog_errno(rc);
155 return rc;
156}
157
158/* Read data from global quotafile - avoid pagecache and such because we cannot
159 * afford acquiring the locks... We use quota cluster lock to serialize
160 * operations. Caller is responsible for acquiring it. */
161ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
162 size_t len, loff_t off)
163{
164 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
165 struct inode *gqinode = oinfo->dqi_gqinode;
166 loff_t i_size = i_size_read(gqinode);
167 int offset = off & (sb->s_blocksize - 1);
168 sector_t blk = off >> sb->s_blocksize_bits;
169 int err = 0;
170 struct buffer_head *bh;
171 size_t toread, tocopy;
172 u64 pblock = 0, pcount = 0;
173
174 if (off > i_size)
175 return 0;
176 if (off + len > i_size)
177 len = i_size - off;
178 toread = len;
179 while (toread > 0) {
180 tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
181 if (!pcount) {
182 err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock,
183 &pcount, NULL);
184 if (err) {
185 mlog_errno(err);
186 return err;
187 }
188 } else {
189 pcount--;
190 pblock++;
191 }
192 bh = NULL;
193 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
194 if (err) {
195 mlog_errno(err);
196 return err;
197 }
198 memcpy(data, bh->b_data + offset, tocopy);
199 brelse(bh);
200 offset = 0;
201 toread -= tocopy;
202 data += tocopy;
203 blk++;
204 }
205 return len;
206}
207
208/* Write to quotafile (we know the transaction is already started and has
209 * enough credits) */
210ssize_t ocfs2_quota_write(struct super_block *sb, int type,
211 const char *data, size_t len, loff_t off)
212{
213 struct mem_dqinfo *info = sb_dqinfo(sb, type);
214 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
215 struct inode *gqinode = oinfo->dqi_gqinode;
216 int offset = off & (sb->s_blocksize - 1);
217 sector_t blk = off >> sb->s_blocksize_bits;
218 int err = 0, new = 0, ja_type;
219 struct buffer_head *bh = NULL;
220 handle_t *handle = journal_current_handle();
221 u64 pblock, pcount;
222
223 if (!handle) {
224 mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
225 "because transaction was not started.\n",
226 (unsigned long long)off, (unsigned long long)len);
227 return -EIO;
228 }
229 if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
230 WARN_ON(1);
231 len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
232 }
233
234 if (gqinode->i_size < off + len) {
235 loff_t rounded_end =
236 ocfs2_align_bytes_to_blocks(sb, off + len);
237
238 /* Space is already allocated in ocfs2_acquire_dquot() */
239 err = ocfs2_simple_size_update(gqinode,
240 oinfo->dqi_gqi_bh,
241 rounded_end);
242 if (err < 0)
243 goto out;
244 new = 1;
245 }
246 err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, &pcount, NULL);
247 if (err) {
248 mlog_errno(err);
249 goto out;
250 }
251 /* Not rewriting whole block? */
252 if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
253 !new) {
254 err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
255 ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
256 } else {
257 bh = sb_getblk(sb, pblock);
258 if (!bh)
259 err = -ENOMEM;
260 ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
261 }
262 if (err) {
263 mlog_errno(err);
264 goto out;
265 }
266 lock_buffer(bh);
267 if (new)
268 memset(bh->b_data, 0, sb->s_blocksize);
269 memcpy(bh->b_data + offset, data, len);
270 flush_dcache_page(bh->b_page);
271 set_buffer_uptodate(bh);
272 unlock_buffer(bh);
273 ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh);
274 err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh,
275 ja_type);
276 if (err < 0) {
277 brelse(bh);
278 goto out;
279 }
280 ocfs2_journal_dirty(handle, bh);
281 brelse(bh);
282out:
283 if (err) {
284 mlog_errno(err);
285 return err;
286 }
287 gqinode->i_version++;
288 ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
289 return len;
290}
291
292int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
293{
294 int status;
295 struct buffer_head *bh = NULL;
296
297 status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
298 if (status < 0)
299 return status;
300 spin_lock(&dq_data_lock);
301 if (!oinfo->dqi_gqi_count++)
302 oinfo->dqi_gqi_bh = bh;
303 else
304 WARN_ON(bh != oinfo->dqi_gqi_bh);
305 spin_unlock(&dq_data_lock);
306 if (ex) {
307 mutex_lock(&oinfo->dqi_gqinode->i_mutex);
308 down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
309 } else {
310 down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
311 }
312 return 0;
313}
314
315void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
316{
317 if (ex) {
318 up_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
319 mutex_unlock(&oinfo->dqi_gqinode->i_mutex);
320 } else {
321 up_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
322 }
323 ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
324 brelse(oinfo->dqi_gqi_bh);
325 spin_lock(&dq_data_lock);
326 if (!--oinfo->dqi_gqi_count)
327 oinfo->dqi_gqi_bh = NULL;
328 spin_unlock(&dq_data_lock);
329}
330
331/* Read information header from global quota file */
332int ocfs2_global_read_info(struct super_block *sb, int type)
333{
334 struct inode *gqinode = NULL;
335 unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
336 GROUP_QUOTA_SYSTEM_INODE };
337 struct ocfs2_global_disk_dqinfo dinfo;
338 struct mem_dqinfo *info = sb_dqinfo(sb, type);
339 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
340 u64 pcount;
341 int status;
342
343 /* Read global header */
344 gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
345 OCFS2_INVALID_SLOT);
346 if (!gqinode) {
347 mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
348 type);
349 status = -EINVAL;
350 goto out_err;
351 }
352 oinfo->dqi_gi.dqi_sb = sb;
353 oinfo->dqi_gi.dqi_type = type;
354 ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
355 oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
356 oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
357 oinfo->dqi_gqi_bh = NULL;
358 oinfo->dqi_gqi_count = 0;
359 oinfo->dqi_gqinode = gqinode;
360 status = ocfs2_lock_global_qf(oinfo, 0);
361 if (status < 0) {
362 mlog_errno(status);
363 goto out_err;
364 }
365
366 status = ocfs2_extent_map_get_blocks(gqinode, 0, &oinfo->dqi_giblk,
367 &pcount, NULL);
368 if (status < 0)
369 goto out_unlock;
370
371 status = ocfs2_qinfo_lock(oinfo, 0);
372 if (status < 0)
373 goto out_unlock;
374 status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
375 sizeof(struct ocfs2_global_disk_dqinfo),
376 OCFS2_GLOBAL_INFO_OFF);
377 ocfs2_qinfo_unlock(oinfo, 0);
378 ocfs2_unlock_global_qf(oinfo, 0);
379 if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
380 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
381 status);
382 if (status >= 0)
383 status = -EIO;
384 mlog_errno(status);
385 goto out_err;
386 }
387 info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
388 info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
389 oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
390 oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
391 oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
392 oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
393 oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
394 oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
395 OCFS2_QBLK_RESERVED_SPACE;
396 oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
397 INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
398 schedule_delayed_work(&oinfo->dqi_sync_work,
399 msecs_to_jiffies(oinfo->dqi_syncms));
400
401out_err:
402 return status;
403out_unlock:
404 ocfs2_unlock_global_qf(oinfo, 0);
405 mlog_errno(status);
406 goto out_err;
407}
408
409/* Write information to global quota file. Expects exlusive lock on quota
410 * file inode and quota info */
411static int __ocfs2_global_write_info(struct super_block *sb, int type)
412{
413 struct mem_dqinfo *info = sb_dqinfo(sb, type);
414 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
415 struct ocfs2_global_disk_dqinfo dinfo;
416 ssize_t size;
417
418 spin_lock(&dq_data_lock);
419 info->dqi_flags &= ~DQF_INFO_DIRTY;
420 dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
421 dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
422 spin_unlock(&dq_data_lock);
423 dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
424 dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
425 dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
426 dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
427 size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
428 sizeof(struct ocfs2_global_disk_dqinfo),
429 OCFS2_GLOBAL_INFO_OFF);
430 if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
431 mlog(ML_ERROR, "Cannot write global quota info structure\n");
432 if (size >= 0)
433 size = -EIO;
434 return size;
435 }
436 return 0;
437}
438
439int ocfs2_global_write_info(struct super_block *sb, int type)
440{
441 int err;
442 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
443
444 err = ocfs2_qinfo_lock(info, 1);
445 if (err < 0)
446 return err;
447 err = __ocfs2_global_write_info(sb, type);
448 ocfs2_qinfo_unlock(info, 1);
449 return err;
450}
451
452static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
453{
454 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
455
456 /*
457 * We may need to allocate tree blocks and a leaf block but not the
458 * root block
459 */
460 return oinfo->dqi_gi.dqi_qtree_depth;
461}
462
463static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
464{
465 /* We modify all the allocated blocks, tree root, info block and
466 * the inode */
467 return (ocfs2_global_qinit_alloc(sb, type) + 2) *
468 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1;
469}
470
471/* Sync local information about quota modifications with global quota file.
472 * Caller must have started the transaction and obtained exclusive lock for
473 * global quota file inode */
474int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
475{
476 int err, err2;
477 struct super_block *sb = dquot->dq_sb;
478 int type = dquot->dq_type;
479 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
480 struct ocfs2_global_disk_dqblk dqblk;
481 s64 spacechange, inodechange;
482 time_t olditime, oldbtime;
483
484 err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
485 sizeof(struct ocfs2_global_disk_dqblk),
486 dquot->dq_off);
487 if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
488 if (err >= 0) {
489 mlog(ML_ERROR, "Short read from global quota file "
490 "(%u read)\n", err);
491 err = -EIO;
492 }
493 goto out;
494 }
495
496 /* Update space and inode usage. Get also other information from
497 * global quota file so that we don't overwrite any changes there.
498 * We are */
499 spin_lock(&dq_data_lock);
500 spacechange = dquot->dq_dqb.dqb_curspace -
501 OCFS2_DQUOT(dquot)->dq_origspace;
502 inodechange = dquot->dq_dqb.dqb_curinodes -
503 OCFS2_DQUOT(dquot)->dq_originodes;
504 olditime = dquot->dq_dqb.dqb_itime;
505 oldbtime = dquot->dq_dqb.dqb_btime;
506 ocfs2_global_disk2memdqb(dquot, &dqblk);
507 trace_ocfs2_sync_dquot(dquot->dq_id, dquot->dq_dqb.dqb_curspace,
508 (long long)spacechange,
509 dquot->dq_dqb.dqb_curinodes,
510 (long long)inodechange);
511 if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
512 dquot->dq_dqb.dqb_curspace += spacechange;
513 if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
514 dquot->dq_dqb.dqb_curinodes += inodechange;
515 /* Set properly space grace time... */
516 if (dquot->dq_dqb.dqb_bsoftlimit &&
517 dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
518 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
519 oldbtime > 0) {
520 if (dquot->dq_dqb.dqb_btime > 0)
521 dquot->dq_dqb.dqb_btime =
522 min(dquot->dq_dqb.dqb_btime, oldbtime);
523 else
524 dquot->dq_dqb.dqb_btime = oldbtime;
525 }
526 } else {
527 dquot->dq_dqb.dqb_btime = 0;
528 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
529 }
530 /* Set properly inode grace time... */
531 if (dquot->dq_dqb.dqb_isoftlimit &&
532 dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
533 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
534 olditime > 0) {
535 if (dquot->dq_dqb.dqb_itime > 0)
536 dquot->dq_dqb.dqb_itime =
537 min(dquot->dq_dqb.dqb_itime, olditime);
538 else
539 dquot->dq_dqb.dqb_itime = olditime;
540 }
541 } else {
542 dquot->dq_dqb.dqb_itime = 0;
543 clear_bit(DQ_INODES_B, &dquot->dq_flags);
544 }
545 /* All information is properly updated, clear the flags */
546 __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
547 __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
548 __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
549 __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
550 __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
551 __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
552 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
553 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
554 spin_unlock(&dq_data_lock);
555 err = ocfs2_qinfo_lock(info, freeing);
556 if (err < 0) {
557 mlog(ML_ERROR, "Failed to lock quota info, losing quota write"
558 " (type=%d, id=%u)\n", dquot->dq_type,
559 (unsigned)dquot->dq_id);
560 goto out;
561 }
562 if (freeing)
563 OCFS2_DQUOT(dquot)->dq_use_count--;
564 err = qtree_write_dquot(&info->dqi_gi, dquot);
565 if (err < 0)
566 goto out_qlock;
567 if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
568 err = qtree_release_dquot(&info->dqi_gi, dquot);
569 if (info_dirty(sb_dqinfo(sb, type))) {
570 err2 = __ocfs2_global_write_info(sb, type);
571 if (!err)
572 err = err2;
573 }
574 }
575out_qlock:
576 ocfs2_qinfo_unlock(info, freeing);
577out:
578 if (err < 0)
579 mlog_errno(err);
580 return err;
581}
582
583/*
584 * Functions for periodic syncing of dquots with global file
585 */
586static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
587{
588 handle_t *handle;
589 struct super_block *sb = dquot->dq_sb;
590 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
591 struct ocfs2_super *osb = OCFS2_SB(sb);
592 int status = 0;
593
594 trace_ocfs2_sync_dquot_helper(dquot->dq_id, dquot->dq_type,
595 type, sb->s_id);
596 if (type != dquot->dq_type)
597 goto out;
598 status = ocfs2_lock_global_qf(oinfo, 1);
599 if (status < 0)
600 goto out;
601
602 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
603 if (IS_ERR(handle)) {
604 status = PTR_ERR(handle);
605 mlog_errno(status);
606 goto out_ilock;
607 }
608 mutex_lock(&sb_dqopt(sb)->dqio_mutex);
609 status = ocfs2_sync_dquot(dquot);
610 if (status < 0)
611 mlog_errno(status);
612 /* We have to write local structure as well... */
613 status = ocfs2_local_write_dquot(dquot);
614 if (status < 0)
615 mlog_errno(status);
616 mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
617 ocfs2_commit_trans(osb, handle);
618out_ilock:
619 ocfs2_unlock_global_qf(oinfo, 1);
620out:
621 return status;
622}
623
624static void qsync_work_fn(struct work_struct *work)
625{
626 struct ocfs2_mem_dqinfo *oinfo = container_of(work,
627 struct ocfs2_mem_dqinfo,
628 dqi_sync_work.work);
629 struct super_block *sb = oinfo->dqi_gqinode->i_sb;
630
631 dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
632 schedule_delayed_work(&oinfo->dqi_sync_work,
633 msecs_to_jiffies(oinfo->dqi_syncms));
634}
635
636/*
637 * Wrappers for generic quota functions
638 */
639
640static int ocfs2_write_dquot(struct dquot *dquot)
641{
642 handle_t *handle;
643 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
644 int status = 0;
645
646 trace_ocfs2_write_dquot(dquot->dq_id, dquot->dq_type);
647
648 handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
649 if (IS_ERR(handle)) {
650 status = PTR_ERR(handle);
651 mlog_errno(status);
652 goto out;
653 }
654 mutex_lock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
655 status = ocfs2_local_write_dquot(dquot);
656 mutex_unlock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
657 ocfs2_commit_trans(osb, handle);
658out:
659 return status;
660}
661
662static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
663{
664 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
665 /*
666 * We modify tree, leaf block, global info, local chunk header,
667 * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
668 * accounts for inode update
669 */
670 return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
671 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
672 OCFS2_QINFO_WRITE_CREDITS +
673 OCFS2_INODE_UPDATE_CREDITS;
674}
675
676static int ocfs2_release_dquot(struct dquot *dquot)
677{
678 handle_t *handle;
679 struct ocfs2_mem_dqinfo *oinfo =
680 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
681 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
682 int status = 0;
683
684 trace_ocfs2_release_dquot(dquot->dq_id, dquot->dq_type);
685
686 mutex_lock(&dquot->dq_lock);
687 /* Check whether we are not racing with some other dqget() */
688 if (atomic_read(&dquot->dq_count) > 1)
689 goto out;
690 status = ocfs2_lock_global_qf(oinfo, 1);
691 if (status < 0)
692 goto out;
693 handle = ocfs2_start_trans(osb,
694 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
695 if (IS_ERR(handle)) {
696 status = PTR_ERR(handle);
697 mlog_errno(status);
698 goto out_ilock;
699 }
700
701 status = ocfs2_global_release_dquot(dquot);
702 if (status < 0) {
703 mlog_errno(status);
704 goto out_trans;
705 }
706 status = ocfs2_local_release_dquot(handle, dquot);
707 /*
708 * If we fail here, we cannot do much as global structure is
709 * already released. So just complain...
710 */
711 if (status < 0)
712 mlog_errno(status);
713 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
714out_trans:
715 ocfs2_commit_trans(osb, handle);
716out_ilock:
717 ocfs2_unlock_global_qf(oinfo, 1);
718out:
719 mutex_unlock(&dquot->dq_lock);
720 if (status)
721 mlog_errno(status);
722 return status;
723}
724
725/*
726 * Read global dquot structure from disk or create it if it does
727 * not exist. Also update use count of the global structure and
728 * create structure in node-local quota file.
729 */
730static int ocfs2_acquire_dquot(struct dquot *dquot)
731{
732 int status = 0, err;
733 int ex = 0;
734 struct super_block *sb = dquot->dq_sb;
735 struct ocfs2_super *osb = OCFS2_SB(sb);
736 int type = dquot->dq_type;
737 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
738 struct inode *gqinode = info->dqi_gqinode;
739 int need_alloc = ocfs2_global_qinit_alloc(sb, type);
740 handle_t *handle;
741
742 trace_ocfs2_acquire_dquot(dquot->dq_id, type);
743 mutex_lock(&dquot->dq_lock);
744 /*
745 * We need an exclusive lock, because we're going to update use count
746 * and instantiate possibly new dquot structure
747 */
748 status = ocfs2_lock_global_qf(info, 1);
749 if (status < 0)
750 goto out;
751 if (!test_bit(DQ_READ_B, &dquot->dq_flags)) {
752 status = ocfs2_qinfo_lock(info, 0);
753 if (status < 0)
754 goto out_dq;
755 status = qtree_read_dquot(&info->dqi_gi, dquot);
756 ocfs2_qinfo_unlock(info, 0);
757 if (status < 0)
758 goto out_dq;
759 }
760 set_bit(DQ_READ_B, &dquot->dq_flags);
761
762 OCFS2_DQUOT(dquot)->dq_use_count++;
763 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
764 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
765 if (!dquot->dq_off) { /* No real quota entry? */
766 ex = 1;
767 /*
768 * Add blocks to quota file before we start a transaction since
769 * locking allocators ranks above a transaction start
770 */
771 WARN_ON(journal_current_handle());
772 status = ocfs2_extend_no_holes(gqinode, NULL,
773 gqinode->i_size + (need_alloc << sb->s_blocksize_bits),
774 gqinode->i_size);
775 if (status < 0)
776 goto out_dq;
777 }
778
779 handle = ocfs2_start_trans(osb,
780 ocfs2_calc_global_qinit_credits(sb, type));
781 if (IS_ERR(handle)) {
782 status = PTR_ERR(handle);
783 goto out_dq;
784 }
785 status = ocfs2_qinfo_lock(info, ex);
786 if (status < 0)
787 goto out_trans;
788 status = qtree_write_dquot(&info->dqi_gi, dquot);
789 if (ex && info_dirty(sb_dqinfo(sb, type))) {
790 err = __ocfs2_global_write_info(sb, type);
791 if (!status)
792 status = err;
793 }
794 ocfs2_qinfo_unlock(info, ex);
795out_trans:
796 ocfs2_commit_trans(osb, handle);
797out_dq:
798 ocfs2_unlock_global_qf(info, 1);
799 if (status < 0)
800 goto out;
801
802 status = ocfs2_create_local_dquot(dquot);
803 if (status < 0)
804 goto out;
805 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
806out:
807 mutex_unlock(&dquot->dq_lock);
808 if (status)
809 mlog_errno(status);
810 return status;
811}
812
813static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
814{
815 unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
816 (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
817 (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
818 (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
819 (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
820 (1 << (DQ_LASTSET_B + QIF_ITIME_B));
821 int sync = 0;
822 int status;
823 struct super_block *sb = dquot->dq_sb;
824 int type = dquot->dq_type;
825 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
826 handle_t *handle;
827 struct ocfs2_super *osb = OCFS2_SB(sb);
828
829 trace_ocfs2_mark_dquot_dirty(dquot->dq_id, type);
830
831 /* In case user set some limits, sync dquot immediately to global
832 * quota file so that information propagates quicker */
833 spin_lock(&dq_data_lock);
834 if (dquot->dq_flags & mask)
835 sync = 1;
836 spin_unlock(&dq_data_lock);
837 /* This is a slight hack but we can't afford getting global quota
838 * lock if we already have a transaction started. */
839 if (!sync || journal_current_handle()) {
840 status = ocfs2_write_dquot(dquot);
841 goto out;
842 }
843 status = ocfs2_lock_global_qf(oinfo, 1);
844 if (status < 0)
845 goto out;
846 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
847 if (IS_ERR(handle)) {
848 status = PTR_ERR(handle);
849 mlog_errno(status);
850 goto out_ilock;
851 }
852 mutex_lock(&sb_dqopt(sb)->dqio_mutex);
853 status = ocfs2_sync_dquot(dquot);
854 if (status < 0) {
855 mlog_errno(status);
856 goto out_dlock;
857 }
858 /* Now write updated local dquot structure */
859 status = ocfs2_local_write_dquot(dquot);
860out_dlock:
861 mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
862 ocfs2_commit_trans(osb, handle);
863out_ilock:
864 ocfs2_unlock_global_qf(oinfo, 1);
865out:
866 if (status)
867 mlog_errno(status);
868 return status;
869}
870
871/* This should happen only after set_dqinfo(). */
872static int ocfs2_write_info(struct super_block *sb, int type)
873{
874 handle_t *handle;
875 int status = 0;
876 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
877
878 status = ocfs2_lock_global_qf(oinfo, 1);
879 if (status < 0)
880 goto out;
881 handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
882 if (IS_ERR(handle)) {
883 status = PTR_ERR(handle);
884 mlog_errno(status);
885 goto out_ilock;
886 }
887 status = dquot_commit_info(sb, type);
888 ocfs2_commit_trans(OCFS2_SB(sb), handle);
889out_ilock:
890 ocfs2_unlock_global_qf(oinfo, 1);
891out:
892 if (status)
893 mlog_errno(status);
894 return status;
895}
896
897static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
898{
899 struct ocfs2_dquot *dquot =
900 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
901
902 if (!dquot)
903 return NULL;
904 return &dquot->dq_dquot;
905}
906
907static void ocfs2_destroy_dquot(struct dquot *dquot)
908{
909 kmem_cache_free(ocfs2_dquot_cachep, dquot);
910}
911
912const struct dquot_operations ocfs2_quota_operations = {
913 /* We never make dquot dirty so .write_dquot is never called */
914 .acquire_dquot = ocfs2_acquire_dquot,
915 .release_dquot = ocfs2_release_dquot,
916 .mark_dirty = ocfs2_mark_dquot_dirty,
917 .write_info = ocfs2_write_info,
918 .alloc_dquot = ocfs2_alloc_dquot,
919 .destroy_dquot = ocfs2_destroy_dquot,
920};