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1/*
2 * Implementation of operations over global quota file
3 */
4#include <linux/spinlock.h>
5#include <linux/fs.h>
6#include <linux/slab.h>
7#include <linux/quota.h>
8#include <linux/quotaops.h>
9#include <linux/dqblk_qtree.h>
10#include <linux/jiffies.h>
11#include <linux/writeback.h>
12#include <linux/workqueue.h>
13
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 if (status)
403 mlog_errno(status);
404 return status;
405out_unlock:
406 ocfs2_unlock_global_qf(oinfo, 0);
407 mlog_errno(status);
408 goto out_err;
409}
410
411/* Write information to global quota file. Expects exlusive lock on quota
412 * file inode and quota info */
413static int __ocfs2_global_write_info(struct super_block *sb, int type)
414{
415 struct mem_dqinfo *info = sb_dqinfo(sb, type);
416 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
417 struct ocfs2_global_disk_dqinfo dinfo;
418 ssize_t size;
419
420 spin_lock(&dq_data_lock);
421 info->dqi_flags &= ~DQF_INFO_DIRTY;
422 dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
423 dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
424 spin_unlock(&dq_data_lock);
425 dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
426 dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
427 dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
428 dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
429 size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
430 sizeof(struct ocfs2_global_disk_dqinfo),
431 OCFS2_GLOBAL_INFO_OFF);
432 if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
433 mlog(ML_ERROR, "Cannot write global quota info structure\n");
434 if (size >= 0)
435 size = -EIO;
436 return size;
437 }
438 return 0;
439}
440
441int ocfs2_global_write_info(struct super_block *sb, int type)
442{
443 int err;
444 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
445
446 err = ocfs2_qinfo_lock(info, 1);
447 if (err < 0)
448 return err;
449 err = __ocfs2_global_write_info(sb, type);
450 ocfs2_qinfo_unlock(info, 1);
451 return err;
452}
453
454static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
455{
456 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
457
458 /*
459 * We may need to allocate tree blocks and a leaf block but not the
460 * root block
461 */
462 return oinfo->dqi_gi.dqi_qtree_depth;
463}
464
465static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
466{
467 /* We modify all the allocated blocks, tree root, info block and
468 * the inode */
469 return (ocfs2_global_qinit_alloc(sb, type) + 2) *
470 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1;
471}
472
473/* Sync local information about quota modifications with global quota file.
474 * Caller must have started the transaction and obtained exclusive lock for
475 * global quota file inode */
476int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
477{
478 int err, err2;
479 struct super_block *sb = dquot->dq_sb;
480 int type = dquot->dq_type;
481 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
482 struct ocfs2_global_disk_dqblk dqblk;
483 s64 spacechange, inodechange;
484 time_t olditime, oldbtime;
485
486 err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
487 sizeof(struct ocfs2_global_disk_dqblk),
488 dquot->dq_off);
489 if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
490 if (err >= 0) {
491 mlog(ML_ERROR, "Short read from global quota file "
492 "(%u read)\n", err);
493 err = -EIO;
494 }
495 goto out;
496 }
497
498 /* Update space and inode usage. Get also other information from
499 * global quota file so that we don't overwrite any changes there.
500 * We are */
501 spin_lock(&dq_data_lock);
502 spacechange = dquot->dq_dqb.dqb_curspace -
503 OCFS2_DQUOT(dquot)->dq_origspace;
504 inodechange = dquot->dq_dqb.dqb_curinodes -
505 OCFS2_DQUOT(dquot)->dq_originodes;
506 olditime = dquot->dq_dqb.dqb_itime;
507 oldbtime = dquot->dq_dqb.dqb_btime;
508 ocfs2_global_disk2memdqb(dquot, &dqblk);
509 trace_ocfs2_sync_dquot(dquot->dq_id, dquot->dq_dqb.dqb_curspace,
510 (long long)spacechange,
511 dquot->dq_dqb.dqb_curinodes,
512 (long long)inodechange);
513 if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
514 dquot->dq_dqb.dqb_curspace += spacechange;
515 if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
516 dquot->dq_dqb.dqb_curinodes += inodechange;
517 /* Set properly space grace time... */
518 if (dquot->dq_dqb.dqb_bsoftlimit &&
519 dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
520 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
521 oldbtime > 0) {
522 if (dquot->dq_dqb.dqb_btime > 0)
523 dquot->dq_dqb.dqb_btime =
524 min(dquot->dq_dqb.dqb_btime, oldbtime);
525 else
526 dquot->dq_dqb.dqb_btime = oldbtime;
527 }
528 } else {
529 dquot->dq_dqb.dqb_btime = 0;
530 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
531 }
532 /* Set properly inode grace time... */
533 if (dquot->dq_dqb.dqb_isoftlimit &&
534 dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
535 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
536 olditime > 0) {
537 if (dquot->dq_dqb.dqb_itime > 0)
538 dquot->dq_dqb.dqb_itime =
539 min(dquot->dq_dqb.dqb_itime, olditime);
540 else
541 dquot->dq_dqb.dqb_itime = olditime;
542 }
543 } else {
544 dquot->dq_dqb.dqb_itime = 0;
545 clear_bit(DQ_INODES_B, &dquot->dq_flags);
546 }
547 /* All information is properly updated, clear the flags */
548 __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
549 __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
550 __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
551 __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
552 __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
553 __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
554 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
555 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
556 spin_unlock(&dq_data_lock);
557 err = ocfs2_qinfo_lock(info, freeing);
558 if (err < 0) {
559 mlog(ML_ERROR, "Failed to lock quota info, losing quota write"
560 " (type=%d, id=%u)\n", dquot->dq_type,
561 (unsigned)dquot->dq_id);
562 goto out;
563 }
564 if (freeing)
565 OCFS2_DQUOT(dquot)->dq_use_count--;
566 err = qtree_write_dquot(&info->dqi_gi, dquot);
567 if (err < 0)
568 goto out_qlock;
569 if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
570 err = qtree_release_dquot(&info->dqi_gi, dquot);
571 if (info_dirty(sb_dqinfo(sb, type))) {
572 err2 = __ocfs2_global_write_info(sb, type);
573 if (!err)
574 err = err2;
575 }
576 }
577out_qlock:
578 ocfs2_qinfo_unlock(info, freeing);
579out:
580 if (err < 0)
581 mlog_errno(err);
582 return err;
583}
584
585/*
586 * Functions for periodic syncing of dquots with global file
587 */
588static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
589{
590 handle_t *handle;
591 struct super_block *sb = dquot->dq_sb;
592 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
593 struct ocfs2_super *osb = OCFS2_SB(sb);
594 int status = 0;
595
596 trace_ocfs2_sync_dquot_helper(dquot->dq_id, dquot->dq_type,
597 type, sb->s_id);
598 if (type != dquot->dq_type)
599 goto out;
600 status = ocfs2_lock_global_qf(oinfo, 1);
601 if (status < 0)
602 goto out;
603
604 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
605 if (IS_ERR(handle)) {
606 status = PTR_ERR(handle);
607 mlog_errno(status);
608 goto out_ilock;
609 }
610 mutex_lock(&sb_dqopt(sb)->dqio_mutex);
611 status = ocfs2_sync_dquot(dquot);
612 if (status < 0)
613 mlog_errno(status);
614 /* We have to write local structure as well... */
615 status = ocfs2_local_write_dquot(dquot);
616 if (status < 0)
617 mlog_errno(status);
618 mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
619 ocfs2_commit_trans(osb, handle);
620out_ilock:
621 ocfs2_unlock_global_qf(oinfo, 1);
622out:
623 return status;
624}
625
626static void qsync_work_fn(struct work_struct *work)
627{
628 struct ocfs2_mem_dqinfo *oinfo = container_of(work,
629 struct ocfs2_mem_dqinfo,
630 dqi_sync_work.work);
631 struct super_block *sb = oinfo->dqi_gqinode->i_sb;
632
633 dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
634 schedule_delayed_work(&oinfo->dqi_sync_work,
635 msecs_to_jiffies(oinfo->dqi_syncms));
636}
637
638/*
639 * Wrappers for generic quota functions
640 */
641
642static int ocfs2_write_dquot(struct dquot *dquot)
643{
644 handle_t *handle;
645 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
646 int status = 0;
647
648 trace_ocfs2_write_dquot(dquot->dq_id, dquot->dq_type);
649
650 handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
651 if (IS_ERR(handle)) {
652 status = PTR_ERR(handle);
653 mlog_errno(status);
654 goto out;
655 }
656 mutex_lock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
657 status = ocfs2_local_write_dquot(dquot);
658 mutex_unlock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
659 ocfs2_commit_trans(osb, handle);
660out:
661 return status;
662}
663
664static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
665{
666 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
667 /*
668 * We modify tree, leaf block, global info, local chunk header,
669 * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
670 * accounts for inode update
671 */
672 return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
673 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
674 OCFS2_QINFO_WRITE_CREDITS +
675 OCFS2_INODE_UPDATE_CREDITS;
676}
677
678static int ocfs2_release_dquot(struct dquot *dquot)
679{
680 handle_t *handle;
681 struct ocfs2_mem_dqinfo *oinfo =
682 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
683 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
684 int status = 0;
685
686 trace_ocfs2_release_dquot(dquot->dq_id, dquot->dq_type);
687
688 mutex_lock(&dquot->dq_lock);
689 /* Check whether we are not racing with some other dqget() */
690 if (atomic_read(&dquot->dq_count) > 1)
691 goto out;
692 status = ocfs2_lock_global_qf(oinfo, 1);
693 if (status < 0)
694 goto out;
695 handle = ocfs2_start_trans(osb,
696 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
697 if (IS_ERR(handle)) {
698 status = PTR_ERR(handle);
699 mlog_errno(status);
700 goto out_ilock;
701 }
702
703 status = ocfs2_global_release_dquot(dquot);
704 if (status < 0) {
705 mlog_errno(status);
706 goto out_trans;
707 }
708 status = ocfs2_local_release_dquot(handle, dquot);
709 /*
710 * If we fail here, we cannot do much as global structure is
711 * already released. So just complain...
712 */
713 if (status < 0)
714 mlog_errno(status);
715 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
716out_trans:
717 ocfs2_commit_trans(osb, handle);
718out_ilock:
719 ocfs2_unlock_global_qf(oinfo, 1);
720out:
721 mutex_unlock(&dquot->dq_lock);
722 if (status)
723 mlog_errno(status);
724 return status;
725}
726
727/*
728 * Read global dquot structure from disk or create it if it does
729 * not exist. Also update use count of the global structure and
730 * create structure in node-local quota file.
731 */
732static int ocfs2_acquire_dquot(struct dquot *dquot)
733{
734 int status = 0, err;
735 int ex = 0;
736 struct super_block *sb = dquot->dq_sb;
737 struct ocfs2_super *osb = OCFS2_SB(sb);
738 int type = dquot->dq_type;
739 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
740 struct inode *gqinode = info->dqi_gqinode;
741 int need_alloc = ocfs2_global_qinit_alloc(sb, type);
742 handle_t *handle;
743
744 trace_ocfs2_acquire_dquot(dquot->dq_id, type);
745 mutex_lock(&dquot->dq_lock);
746 /*
747 * We need an exclusive lock, because we're going to update use count
748 * and instantiate possibly new dquot structure
749 */
750 status = ocfs2_lock_global_qf(info, 1);
751 if (status < 0)
752 goto out;
753 if (!test_bit(DQ_READ_B, &dquot->dq_flags)) {
754 status = ocfs2_qinfo_lock(info, 0);
755 if (status < 0)
756 goto out_dq;
757 status = qtree_read_dquot(&info->dqi_gi, dquot);
758 ocfs2_qinfo_unlock(info, 0);
759 if (status < 0)
760 goto out_dq;
761 }
762 set_bit(DQ_READ_B, &dquot->dq_flags);
763
764 OCFS2_DQUOT(dquot)->dq_use_count++;
765 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
766 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
767 if (!dquot->dq_off) { /* No real quota entry? */
768 ex = 1;
769 /*
770 * Add blocks to quota file before we start a transaction since
771 * locking allocators ranks above a transaction start
772 */
773 WARN_ON(journal_current_handle());
774 status = ocfs2_extend_no_holes(gqinode, NULL,
775 gqinode->i_size + (need_alloc << sb->s_blocksize_bits),
776 gqinode->i_size);
777 if (status < 0)
778 goto out_dq;
779 }
780
781 handle = ocfs2_start_trans(osb,
782 ocfs2_calc_global_qinit_credits(sb, type));
783 if (IS_ERR(handle)) {
784 status = PTR_ERR(handle);
785 goto out_dq;
786 }
787 status = ocfs2_qinfo_lock(info, ex);
788 if (status < 0)
789 goto out_trans;
790 status = qtree_write_dquot(&info->dqi_gi, dquot);
791 if (ex && info_dirty(sb_dqinfo(sb, type))) {
792 err = __ocfs2_global_write_info(sb, type);
793 if (!status)
794 status = err;
795 }
796 ocfs2_qinfo_unlock(info, ex);
797out_trans:
798 ocfs2_commit_trans(osb, handle);
799out_dq:
800 ocfs2_unlock_global_qf(info, 1);
801 if (status < 0)
802 goto out;
803
804 status = ocfs2_create_local_dquot(dquot);
805 if (status < 0)
806 goto out;
807 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
808out:
809 mutex_unlock(&dquot->dq_lock);
810 if (status)
811 mlog_errno(status);
812 return status;
813}
814
815static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
816{
817 unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
818 (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
819 (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
820 (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
821 (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
822 (1 << (DQ_LASTSET_B + QIF_ITIME_B));
823 int sync = 0;
824 int status;
825 struct super_block *sb = dquot->dq_sb;
826 int type = dquot->dq_type;
827 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
828 handle_t *handle;
829 struct ocfs2_super *osb = OCFS2_SB(sb);
830
831 trace_ocfs2_mark_dquot_dirty(dquot->dq_id, type);
832
833 /* In case user set some limits, sync dquot immediately to global
834 * quota file so that information propagates quicker */
835 spin_lock(&dq_data_lock);
836 if (dquot->dq_flags & mask)
837 sync = 1;
838 spin_unlock(&dq_data_lock);
839 /* This is a slight hack but we can't afford getting global quota
840 * lock if we already have a transaction started. */
841 if (!sync || journal_current_handle()) {
842 status = ocfs2_write_dquot(dquot);
843 goto out;
844 }
845 status = ocfs2_lock_global_qf(oinfo, 1);
846 if (status < 0)
847 goto out;
848 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
849 if (IS_ERR(handle)) {
850 status = PTR_ERR(handle);
851 mlog_errno(status);
852 goto out_ilock;
853 }
854 mutex_lock(&sb_dqopt(sb)->dqio_mutex);
855 status = ocfs2_sync_dquot(dquot);
856 if (status < 0) {
857 mlog_errno(status);
858 goto out_dlock;
859 }
860 /* Now write updated local dquot structure */
861 status = ocfs2_local_write_dquot(dquot);
862out_dlock:
863 mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
864 ocfs2_commit_trans(osb, handle);
865out_ilock:
866 ocfs2_unlock_global_qf(oinfo, 1);
867out:
868 if (status)
869 mlog_errno(status);
870 return status;
871}
872
873/* This should happen only after set_dqinfo(). */
874static int ocfs2_write_info(struct super_block *sb, int type)
875{
876 handle_t *handle;
877 int status = 0;
878 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
879
880 status = ocfs2_lock_global_qf(oinfo, 1);
881 if (status < 0)
882 goto out;
883 handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
884 if (IS_ERR(handle)) {
885 status = PTR_ERR(handle);
886 mlog_errno(status);
887 goto out_ilock;
888 }
889 status = dquot_commit_info(sb, type);
890 ocfs2_commit_trans(OCFS2_SB(sb), handle);
891out_ilock:
892 ocfs2_unlock_global_qf(oinfo, 1);
893out:
894 if (status)
895 mlog_errno(status);
896 return status;
897}
898
899static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
900{
901 struct ocfs2_dquot *dquot =
902 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
903
904 if (!dquot)
905 return NULL;
906 return &dquot->dq_dquot;
907}
908
909static void ocfs2_destroy_dquot(struct dquot *dquot)
910{
911 kmem_cache_free(ocfs2_dquot_cachep, dquot);
912}
913
914const struct dquot_operations ocfs2_quota_operations = {
915 /* We never make dquot dirty so .write_dquot is never called */
916 .acquire_dquot = ocfs2_acquire_dquot,
917 .release_dquot = ocfs2_release_dquot,
918 .mark_dirty = ocfs2_mark_dquot_dirty,
919 .write_info = ocfs2_write_info,
920 .alloc_dquot = ocfs2_alloc_dquot,
921 .destroy_dquot = ocfs2_destroy_dquot,
922};
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 mlog_errno(status);
376 goto out_unlock;
377 }
378
379 status = ocfs2_qinfo_lock(oinfo, 0);
380 if (status < 0) {
381 mlog_errno(status);
382 goto out_unlock;
383 }
384 status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
385 sizeof(struct ocfs2_global_disk_dqinfo),
386 OCFS2_GLOBAL_INFO_OFF);
387 ocfs2_qinfo_unlock(oinfo, 0);
388 ocfs2_unlock_global_qf(oinfo, 0);
389 if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
390 mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
391 status);
392 if (status >= 0)
393 status = -EIO;
394 mlog_errno(status);
395 goto out_err;
396 }
397 info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
398 info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
399 oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
400 oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
401 oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
402 oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
403 oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
404 oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
405 OCFS2_QBLK_RESERVED_SPACE;
406 oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
407 INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
408 schedule_delayed_work(&oinfo->dqi_sync_work,
409 msecs_to_jiffies(oinfo->dqi_syncms));
410
411 return 0;
412out_unlock:
413 ocfs2_unlock_global_qf(oinfo, 0);
414out_err:
415 return status;
416}
417
418/* Write information to global quota file. Expects exclusive lock on quota
419 * file inode and quota info */
420static int __ocfs2_global_write_info(struct super_block *sb, int type)
421{
422 struct mem_dqinfo *info = sb_dqinfo(sb, type);
423 struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
424 struct ocfs2_global_disk_dqinfo dinfo;
425 ssize_t size;
426
427 spin_lock(&dq_data_lock);
428 info->dqi_flags &= ~DQF_INFO_DIRTY;
429 dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
430 dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
431 spin_unlock(&dq_data_lock);
432 dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
433 dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
434 dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
435 dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
436 size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
437 sizeof(struct ocfs2_global_disk_dqinfo),
438 OCFS2_GLOBAL_INFO_OFF);
439 if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
440 mlog(ML_ERROR, "Cannot write global quota info structure\n");
441 if (size >= 0)
442 size = -EIO;
443 return size;
444 }
445 return 0;
446}
447
448int ocfs2_global_write_info(struct super_block *sb, int type)
449{
450 int err;
451 struct quota_info *dqopt = sb_dqopt(sb);
452 struct ocfs2_mem_dqinfo *info = dqopt->info[type].dqi_priv;
453 unsigned int memalloc;
454
455 down_write(&dqopt->dqio_sem);
456 memalloc = memalloc_nofs_save();
457 err = ocfs2_qinfo_lock(info, 1);
458 if (err < 0)
459 goto out_sem;
460 err = __ocfs2_global_write_info(sb, type);
461 ocfs2_qinfo_unlock(info, 1);
462out_sem:
463 memalloc_nofs_restore(memalloc);
464 up_write(&dqopt->dqio_sem);
465 return err;
466}
467
468static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
469{
470 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
471
472 /*
473 * We may need to allocate tree blocks and a leaf block but not the
474 * root block
475 */
476 return oinfo->dqi_gi.dqi_qtree_depth;
477}
478
479static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
480{
481 /* We modify all the allocated blocks, tree root, info block and
482 * the inode */
483 return (ocfs2_global_qinit_alloc(sb, type) + 2) *
484 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1;
485}
486
487/* Sync local information about quota modifications with global quota file.
488 * Caller must have started the transaction and obtained exclusive lock for
489 * global quota file inode */
490int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
491{
492 int err, err2;
493 struct super_block *sb = dquot->dq_sb;
494 int type = dquot->dq_id.type;
495 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
496 struct ocfs2_global_disk_dqblk dqblk;
497 s64 spacechange, inodechange;
498 time64_t olditime, oldbtime;
499
500 err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
501 sizeof(struct ocfs2_global_disk_dqblk),
502 dquot->dq_off);
503 if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
504 if (err >= 0) {
505 mlog(ML_ERROR, "Short read from global quota file "
506 "(%u read)\n", err);
507 err = -EIO;
508 }
509 goto out;
510 }
511
512 /* Update space and inode usage. Get also other information from
513 * global quota file so that we don't overwrite any changes there.
514 * We are */
515 spin_lock(&dquot->dq_dqb_lock);
516 spacechange = dquot->dq_dqb.dqb_curspace -
517 OCFS2_DQUOT(dquot)->dq_origspace;
518 inodechange = dquot->dq_dqb.dqb_curinodes -
519 OCFS2_DQUOT(dquot)->dq_originodes;
520 olditime = dquot->dq_dqb.dqb_itime;
521 oldbtime = dquot->dq_dqb.dqb_btime;
522 ocfs2_global_disk2memdqb(dquot, &dqblk);
523 trace_ocfs2_sync_dquot(from_kqid(&init_user_ns, dquot->dq_id),
524 dquot->dq_dqb.dqb_curspace,
525 (long long)spacechange,
526 dquot->dq_dqb.dqb_curinodes,
527 (long long)inodechange);
528 if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
529 dquot->dq_dqb.dqb_curspace += spacechange;
530 if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
531 dquot->dq_dqb.dqb_curinodes += inodechange;
532 /* Set properly space grace time... */
533 if (dquot->dq_dqb.dqb_bsoftlimit &&
534 dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
535 if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
536 oldbtime > 0) {
537 if (dquot->dq_dqb.dqb_btime > 0)
538 dquot->dq_dqb.dqb_btime =
539 min(dquot->dq_dqb.dqb_btime, oldbtime);
540 else
541 dquot->dq_dqb.dqb_btime = oldbtime;
542 }
543 } else {
544 dquot->dq_dqb.dqb_btime = 0;
545 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
546 }
547 /* Set properly inode grace time... */
548 if (dquot->dq_dqb.dqb_isoftlimit &&
549 dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
550 if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
551 olditime > 0) {
552 if (dquot->dq_dqb.dqb_itime > 0)
553 dquot->dq_dqb.dqb_itime =
554 min(dquot->dq_dqb.dqb_itime, olditime);
555 else
556 dquot->dq_dqb.dqb_itime = olditime;
557 }
558 } else {
559 dquot->dq_dqb.dqb_itime = 0;
560 clear_bit(DQ_INODES_B, &dquot->dq_flags);
561 }
562 /* All information is properly updated, clear the flags */
563 __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
564 __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
565 __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
566 __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
567 __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
568 __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
569 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
570 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
571 spin_unlock(&dquot->dq_dqb_lock);
572 err = ocfs2_qinfo_lock(info, freeing);
573 if (err < 0) {
574 mlog(ML_ERROR, "Failed to lock quota info, losing quota write"
575 " (type=%d, id=%u)\n", dquot->dq_id.type,
576 (unsigned)from_kqid(&init_user_ns, dquot->dq_id));
577 goto out;
578 }
579 if (freeing)
580 OCFS2_DQUOT(dquot)->dq_use_count--;
581 err = qtree_write_dquot(&info->dqi_gi, dquot);
582 if (err < 0)
583 goto out_qlock;
584 if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
585 err = qtree_release_dquot(&info->dqi_gi, dquot);
586 if (info_dirty(sb_dqinfo(sb, type))) {
587 err2 = __ocfs2_global_write_info(sb, type);
588 if (!err)
589 err = err2;
590 }
591 }
592out_qlock:
593 ocfs2_qinfo_unlock(info, freeing);
594out:
595 if (err < 0)
596 mlog_errno(err);
597 return err;
598}
599
600/*
601 * Functions for periodic syncing of dquots with global file
602 */
603static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
604{
605 handle_t *handle;
606 struct super_block *sb = dquot->dq_sb;
607 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
608 struct ocfs2_super *osb = OCFS2_SB(sb);
609 int status = 0;
610 unsigned int memalloc;
611
612 trace_ocfs2_sync_dquot_helper(from_kqid(&init_user_ns, dquot->dq_id),
613 dquot->dq_id.type,
614 type, sb->s_id);
615 if (type != dquot->dq_id.type)
616 goto out;
617 status = ocfs2_lock_global_qf(oinfo, 1);
618 if (status < 0)
619 goto out;
620
621 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
622 if (IS_ERR(handle)) {
623 status = PTR_ERR(handle);
624 mlog_errno(status);
625 goto out_ilock;
626 }
627 down_write(&sb_dqopt(sb)->dqio_sem);
628 memalloc = memalloc_nofs_save();
629 status = ocfs2_sync_dquot(dquot);
630 if (status < 0)
631 mlog_errno(status);
632 /* We have to write local structure as well... */
633 status = ocfs2_local_write_dquot(dquot);
634 if (status < 0)
635 mlog_errno(status);
636 memalloc_nofs_restore(memalloc);
637 up_write(&sb_dqopt(sb)->dqio_sem);
638 ocfs2_commit_trans(osb, handle);
639out_ilock:
640 ocfs2_unlock_global_qf(oinfo, 1);
641out:
642 return status;
643}
644
645static void qsync_work_fn(struct work_struct *work)
646{
647 struct ocfs2_mem_dqinfo *oinfo = container_of(work,
648 struct ocfs2_mem_dqinfo,
649 dqi_sync_work.work);
650 struct super_block *sb = oinfo->dqi_gqinode->i_sb;
651
652 /*
653 * We have to be careful here not to deadlock on s_umount as umount
654 * disabling quotas may be in progress and it waits for this work to
655 * complete. If trylock fails, we'll do the sync next time...
656 */
657 if (down_read_trylock(&sb->s_umount)) {
658 dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
659 up_read(&sb->s_umount);
660 }
661 schedule_delayed_work(&oinfo->dqi_sync_work,
662 msecs_to_jiffies(oinfo->dqi_syncms));
663}
664
665/*
666 * Wrappers for generic quota functions
667 */
668
669static int ocfs2_write_dquot(struct dquot *dquot)
670{
671 handle_t *handle;
672 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
673 int status = 0;
674 unsigned int memalloc;
675
676 trace_ocfs2_write_dquot(from_kqid(&init_user_ns, dquot->dq_id),
677 dquot->dq_id.type);
678
679 handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
680 if (IS_ERR(handle)) {
681 status = PTR_ERR(handle);
682 mlog_errno(status);
683 goto out;
684 }
685 down_write(&sb_dqopt(dquot->dq_sb)->dqio_sem);
686 memalloc = memalloc_nofs_save();
687 status = ocfs2_local_write_dquot(dquot);
688 memalloc_nofs_restore(memalloc);
689 up_write(&sb_dqopt(dquot->dq_sb)->dqio_sem);
690 ocfs2_commit_trans(osb, handle);
691out:
692 return status;
693}
694
695static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
696{
697 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
698 /*
699 * We modify tree, leaf block, global info, local chunk header,
700 * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
701 * accounts for inode update
702 */
703 return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
704 OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
705 OCFS2_QINFO_WRITE_CREDITS +
706 OCFS2_INODE_UPDATE_CREDITS;
707}
708
709void ocfs2_drop_dquot_refs(struct work_struct *work)
710{
711 struct ocfs2_super *osb = container_of(work, struct ocfs2_super,
712 dquot_drop_work);
713 struct llist_node *list;
714 struct ocfs2_dquot *odquot, *next_odquot;
715
716 list = llist_del_all(&osb->dquot_drop_list);
717 llist_for_each_entry_safe(odquot, next_odquot, list, list) {
718 /* Drop the reference we acquired in ocfs2_dquot_release() */
719 dqput(&odquot->dq_dquot);
720 }
721}
722
723/*
724 * Called when the last reference to dquot is dropped. If we are called from
725 * downconvert thread, we cannot do all the handling here because grabbing
726 * quota lock could deadlock (the node holding the quota lock could need some
727 * other cluster lock to proceed but with blocked downconvert thread we cannot
728 * release any lock).
729 */
730static int ocfs2_release_dquot(struct dquot *dquot)
731{
732 handle_t *handle;
733 struct ocfs2_mem_dqinfo *oinfo =
734 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
735 struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
736 int status = 0;
737
738 trace_ocfs2_release_dquot(from_kqid(&init_user_ns, dquot->dq_id),
739 dquot->dq_id.type);
740
741 mutex_lock(&dquot->dq_lock);
742 /* Check whether we are not racing with some other dqget() */
743 if (dquot_is_busy(dquot))
744 goto out;
745 /* Running from downconvert thread? Postpone quota processing to wq */
746 if (current == osb->dc_task) {
747 /*
748 * Grab our own reference to dquot and queue it for delayed
749 * dropping. Quota code rechecks after calling
750 * ->release_dquot() and won't free dquot structure.
751 */
752 dqgrab(dquot);
753 /* First entry on list -> queue work */
754 if (llist_add(&OCFS2_DQUOT(dquot)->list, &osb->dquot_drop_list))
755 queue_work(osb->ocfs2_wq, &osb->dquot_drop_work);
756 goto out;
757 }
758 status = ocfs2_lock_global_qf(oinfo, 1);
759 if (status < 0)
760 goto out;
761 handle = ocfs2_start_trans(osb,
762 ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_id.type));
763 if (IS_ERR(handle)) {
764 /*
765 * Mark dquot as inactive to avoid endless cycle in
766 * quota_release_workfn().
767 */
768 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
769 status = PTR_ERR(handle);
770 mlog_errno(status);
771 goto out_ilock;
772 }
773
774 status = ocfs2_global_release_dquot(dquot);
775 if (status < 0) {
776 mlog_errno(status);
777 goto out_trans;
778 }
779 status = ocfs2_local_release_dquot(handle, dquot);
780 /*
781 * If we fail here, we cannot do much as global structure is
782 * already released. So just complain...
783 */
784 if (status < 0)
785 mlog_errno(status);
786 /*
787 * Clear dq_off so that we search for the structure in quota file next
788 * time we acquire it. The structure might be deleted and reallocated
789 * elsewhere by another node while our dquot structure is on freelist.
790 */
791 dquot->dq_off = 0;
792 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
793out_trans:
794 ocfs2_commit_trans(osb, handle);
795out_ilock:
796 ocfs2_unlock_global_qf(oinfo, 1);
797out:
798 mutex_unlock(&dquot->dq_lock);
799 if (status)
800 mlog_errno(status);
801 return status;
802}
803
804/*
805 * Read global dquot structure from disk or create it if it does
806 * not exist. Also update use count of the global structure and
807 * create structure in node-local quota file.
808 */
809static int ocfs2_acquire_dquot(struct dquot *dquot)
810{
811 int status = 0, err;
812 int ex = 0;
813 struct super_block *sb = dquot->dq_sb;
814 struct ocfs2_super *osb = OCFS2_SB(sb);
815 int type = dquot->dq_id.type;
816 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
817 struct inode *gqinode = info->dqi_gqinode;
818 int need_alloc = ocfs2_global_qinit_alloc(sb, type);
819 handle_t *handle;
820
821 trace_ocfs2_acquire_dquot(from_kqid(&init_user_ns, dquot->dq_id),
822 type);
823 mutex_lock(&dquot->dq_lock);
824 /*
825 * We need an exclusive lock, because we're going to update use count
826 * and instantiate possibly new dquot structure
827 */
828 status = ocfs2_lock_global_qf(info, 1);
829 if (status < 0)
830 goto out;
831 status = ocfs2_qinfo_lock(info, 0);
832 if (status < 0)
833 goto out_dq;
834 /*
835 * We always want to read dquot structure from disk because we don't
836 * know what happened with it while it was on freelist.
837 */
838 status = qtree_read_dquot(&info->dqi_gi, dquot);
839 ocfs2_qinfo_unlock(info, 0);
840 if (status < 0)
841 goto out_dq;
842
843 OCFS2_DQUOT(dquot)->dq_use_count++;
844 OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
845 OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
846 if (!dquot->dq_off) { /* No real quota entry? */
847 ex = 1;
848 /*
849 * Add blocks to quota file before we start a transaction since
850 * locking allocators ranks above a transaction start
851 */
852 WARN_ON(journal_current_handle());
853 status = ocfs2_extend_no_holes(gqinode, NULL,
854 i_size_read(gqinode) + (need_alloc << sb->s_blocksize_bits),
855 i_size_read(gqinode));
856 if (status < 0)
857 goto out_dq;
858 }
859
860 handle = ocfs2_start_trans(osb,
861 ocfs2_calc_global_qinit_credits(sb, type));
862 if (IS_ERR(handle)) {
863 status = PTR_ERR(handle);
864 goto out_dq;
865 }
866 status = ocfs2_qinfo_lock(info, ex);
867 if (status < 0)
868 goto out_trans;
869 status = qtree_write_dquot(&info->dqi_gi, dquot);
870 if (ex && info_dirty(sb_dqinfo(sb, type))) {
871 err = __ocfs2_global_write_info(sb, type);
872 if (!status)
873 status = err;
874 }
875 ocfs2_qinfo_unlock(info, ex);
876out_trans:
877 ocfs2_commit_trans(osb, handle);
878out_dq:
879 ocfs2_unlock_global_qf(info, 1);
880 if (status < 0)
881 goto out;
882
883 status = ocfs2_create_local_dquot(dquot);
884 if (status < 0)
885 goto out;
886 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
887out:
888 mutex_unlock(&dquot->dq_lock);
889 if (status)
890 mlog_errno(status);
891 return status;
892}
893
894static int ocfs2_get_next_id(struct super_block *sb, struct kqid *qid)
895{
896 int type = qid->type;
897 struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
898 int status = 0;
899
900 trace_ocfs2_get_next_id(from_kqid(&init_user_ns, *qid), type);
901 if (!sb_has_quota_active(sb, type)) {
902 status = -ESRCH;
903 goto out;
904 }
905 status = ocfs2_lock_global_qf(info, 0);
906 if (status < 0)
907 goto out;
908 status = ocfs2_qinfo_lock(info, 0);
909 if (status < 0)
910 goto out_global;
911 status = qtree_get_next_id(&info->dqi_gi, qid);
912 ocfs2_qinfo_unlock(info, 0);
913out_global:
914 ocfs2_unlock_global_qf(info, 0);
915out:
916 /*
917 * Avoid logging ENOENT since it just means there isn't next ID and
918 * ESRCH which means quota isn't enabled for the filesystem.
919 */
920 if (status && status != -ENOENT && status != -ESRCH)
921 mlog_errno(status);
922 return status;
923}
924
925static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
926{
927 unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
928 (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
929 (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
930 (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
931 (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
932 (1 << (DQ_LASTSET_B + QIF_ITIME_B));
933 int sync = 0;
934 int status;
935 struct super_block *sb = dquot->dq_sb;
936 int type = dquot->dq_id.type;
937 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
938 handle_t *handle;
939 struct ocfs2_super *osb = OCFS2_SB(sb);
940 unsigned int memalloc;
941
942 trace_ocfs2_mark_dquot_dirty(from_kqid(&init_user_ns, dquot->dq_id),
943 type);
944
945 /* In case user set some limits, sync dquot immediately to global
946 * quota file so that information propagates quicker */
947 spin_lock(&dquot->dq_dqb_lock);
948 if (dquot->dq_flags & mask)
949 sync = 1;
950 spin_unlock(&dquot->dq_dqb_lock);
951 /* This is a slight hack but we can't afford getting global quota
952 * lock if we already have a transaction started. */
953 if (!sync || journal_current_handle()) {
954 status = ocfs2_write_dquot(dquot);
955 goto out;
956 }
957 status = ocfs2_lock_global_qf(oinfo, 1);
958 if (status < 0)
959 goto out;
960 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
961 if (IS_ERR(handle)) {
962 status = PTR_ERR(handle);
963 mlog_errno(status);
964 goto out_ilock;
965 }
966 down_write(&sb_dqopt(sb)->dqio_sem);
967 memalloc = memalloc_nofs_save();
968 status = ocfs2_sync_dquot(dquot);
969 if (status < 0) {
970 mlog_errno(status);
971 goto out_dlock;
972 }
973 /* Now write updated local dquot structure */
974 status = ocfs2_local_write_dquot(dquot);
975out_dlock:
976 memalloc_nofs_restore(memalloc);
977 up_write(&sb_dqopt(sb)->dqio_sem);
978 ocfs2_commit_trans(osb, handle);
979out_ilock:
980 ocfs2_unlock_global_qf(oinfo, 1);
981out:
982 if (status)
983 mlog_errno(status);
984 return status;
985}
986
987/* This should happen only after set_dqinfo(). */
988static int ocfs2_write_info(struct super_block *sb, int type)
989{
990 handle_t *handle;
991 int status = 0;
992 struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
993
994 status = ocfs2_lock_global_qf(oinfo, 1);
995 if (status < 0)
996 goto out;
997 handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
998 if (IS_ERR(handle)) {
999 status = PTR_ERR(handle);
1000 mlog_errno(status);
1001 goto out_ilock;
1002 }
1003 status = dquot_commit_info(sb, type);
1004 ocfs2_commit_trans(OCFS2_SB(sb), handle);
1005out_ilock:
1006 ocfs2_unlock_global_qf(oinfo, 1);
1007out:
1008 if (status)
1009 mlog_errno(status);
1010 return status;
1011}
1012
1013static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
1014{
1015 struct ocfs2_dquot *dquot =
1016 kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
1017
1018 if (!dquot)
1019 return NULL;
1020 return &dquot->dq_dquot;
1021}
1022
1023static void ocfs2_destroy_dquot(struct dquot *dquot)
1024{
1025 kmem_cache_free(ocfs2_dquot_cachep, dquot);
1026}
1027
1028const struct dquot_operations ocfs2_quota_operations = {
1029 /* We never make dquot dirty so .write_dquot is never called */
1030 .acquire_dquot = ocfs2_acquire_dquot,
1031 .release_dquot = ocfs2_release_dquot,
1032 .mark_dirty = ocfs2_mark_dquot_dirty,
1033 .write_info = ocfs2_write_info,
1034 .alloc_dquot = ocfs2_alloc_dquot,
1035 .destroy_dquot = ocfs2_destroy_dquot,
1036 .get_next_id = ocfs2_get_next_id,
1037};