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(sb: dquot->dq_sb, type: dquot->dq_id.type)->dqi_priv;
119
120 if (qtree_entry_unused(info: &oinfo->dqi_gi, disk: dp))
121 return 0;
122
123 return qid_eq(left: make_kqid(from: &init_user_ns, type: dquot->dq_id.type,
124 le32_to_cpu(d->dqb_id)),
125 right: 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(blocksize: sb->s_blocksize, buf: bh->b_data);
138
139 trace_ocfs2_validate_quota_block(num: (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, data: bh->b_data, bc: &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(ci: INODE_CACHE(inode), block: p_block, nr: 1, bhs: bhp, flags: 0,
158 validate: 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(inode: 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(inode: gqinode, v_blkno: blk, p_blkno: &pblock,
189 ret_count: &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(inode: gqinode, p_block: pblock, bhp: &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(inode: gqinode) < off + len) {
241 loff_t rounded_end =
242 ocfs2_align_bytes_to_blocks(sb, bytes: off + len);
243
244 /* Space is already allocated in ocfs2_acquire_dquot() */
245 err = ocfs2_simple_size_update(inode: gqinode,
246 di_bh: oinfo->dqi_gqi_bh,
247 new_i_size: rounded_end);
248 if (err < 0)
249 goto out;
250 new = 1;
251 }
252 err = ocfs2_extent_map_get_blocks(inode: gqinode, v_blkno: blk, p_blkno: &pblock, ret_count: &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(inode: gqinode, p_block: pblock, bhp: &bh);
261 ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
262 } else {
263 bh = sb_getblk(sb, block: 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(page: bh->b_page);
277 set_buffer_uptodate(bh);
278 unlock_buffer(bh);
279 ocfs2_set_buffer_uptodate(ci: INODE_CACHE(inode: gqinode), bh);
280 err = ocfs2_journal_access_dq(handle, ci: INODE_CACHE(inode: gqinode), bh,
281 type: 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(inode: gqinode);
294 ocfs2_mark_inode_dirty(handle, inode: gqinode, bh: 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(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(lock: &dq_data_lock);
312 if (ex) {
313 inode_lock(inode: oinfo->dqi_gqinode);
314 down_write(sem: &OCFS2_I(inode: oinfo->dqi_gqinode)->ip_alloc_sem);
315 } else {
316 down_read(sem: &OCFS2_I(inode: 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(sem: &OCFS2_I(inode: oinfo->dqi_gqinode)->ip_alloc_sem);
325 inode_unlock(inode: oinfo->dqi_gqinode);
326 } else {
327 up_read(sem: &OCFS2_I(inode: oinfo->dqi_gqinode)->ip_alloc_sem);
328 }
329 ocfs2_inode_unlock(inode: oinfo->dqi_gqinode, ex);
330 brelse(bh: oinfo->dqi_gqi_bh);
331 spin_lock(lock: &dq_data_lock);
332 if (!--oinfo->dqi_gqi_count)
333 oinfo->dqi_gqi_bh = NULL;
334 spin_unlock(lock: &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(lockres: &oinfo->dqi_gqlock, info: 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), type: 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, ex: 0);
367 if (status < 0) {
368 mlog_errno(status);
369 goto out_err;
370 }
371
372 status = ocfs2_extent_map_get_blocks(inode: oinfo->dqi_gqinode, v_blkno: 0, p_blkno: &oinfo->dqi_giblk,
373 ret_count: &pcount, NULL);
374 if (status < 0)
375 goto out_unlock;
376
377 status = ocfs2_qinfo_lock(oinfo, ex: 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, ex: 0);
384 ocfs2_unlock_global_qf(oinfo, ex: 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(info: &oinfo->dqi_gi);
403 INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
404 schedule_delayed_work(dwork: &oinfo->dqi_sync_work,
405 delay: msecs_to_jiffies(m: oinfo->dqi_syncms));
406
407out_err:
408 return status;
409out_unlock:
410 ocfs2_unlock_global_qf(oinfo, ex: 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(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(lock: &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(sem: &dqopt->dqio_sem);
452 err = ocfs2_qinfo_lock(oinfo: info, ex: 1);
453 if (err < 0)
454 goto out_sem;
455 err = __ocfs2_global_write_info(sb, type);
456 ocfs2_qinfo_unlock(oinfo: info, ex: 1);
457out_sem:
458 up_write(sem: &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(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, dp: &dqblk);
517 trace_ocfs2_sync_dquot(dq_id: from_kqid(to: &init_user_ns, qid: dquot->dq_id),
518 dqb_curspace: dquot->dq_dqb.dqb_curspace,
519 spacechange: (long long)spacechange,
520 curinodes: dquot->dq_dqb.dqb_curinodes,
521 inodechange: (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, addr: &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, addr: &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(lock: &dquot->dq_dqb_lock);
566 err = ocfs2_qinfo_lock(oinfo: info, ex: 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: &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: &info->dqi_gi, dquot);
580 if (info_dirty(info: 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(oinfo: info, ex: 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(dq_id: from_kqid(to: &init_user_ns, qid: dquot->dq_id),
606 dq_type: dquot->dq_id.type,
607 type, s_id: sb->s_id);
608 if (type != dquot->dq_id.type)
609 goto out;
610 status = ocfs2_lock_global_qf(oinfo, ex: 1);
611 if (status < 0)
612 goto out;
613
614 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
615 if (IS_ERR(ptr: handle)) {
616 status = PTR_ERR(ptr: handle);
617 mlog_errno(status);
618 goto out_ilock;
619 }
620 down_write(sem: &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(sem: &sb_dqopt(sb)->dqio_sem);
629 ocfs2_commit_trans(osb, handle);
630out_ilock:
631 ocfs2_unlock_global_qf(oinfo, ex: 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(sem: &sb->s_umount)) {
649 dquot_scan_active(sb, fn: ocfs2_sync_dquot_helper, priv: oinfo->dqi_type);
650 up_read(sem: &sb->s_umount);
651 }
652 schedule_delayed_work(dwork: &oinfo->dqi_sync_work,
653 delay: msecs_to_jiffies(m: 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(val1: from_kqid(to: &init_user_ns, qid: dquot->dq_id),
667 val2: dquot->dq_id.type);
668
669 handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
670 if (IS_ERR(ptr: handle)) {
671 status = PTR_ERR(ptr: handle);
672 mlog_errno(status);
673 goto out;
674 }
675 down_write(sem: &sb_dqopt(sb: dquot->dq_sb)->dqio_sem);
676 status = ocfs2_local_write_dquot(dquot);
677 up_write(sem: &sb_dqopt(sb: 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(head: &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(dquot: &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(sb: dquot->dq_sb, type: 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(val1: from_kqid(to: &init_user_ns, qid: dquot->dq_id),
727 val2: 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(new: &OCFS2_DQUOT(dquot)->list, head: &osb->dquot_drop_list))
743 queue_work(wq: osb->ocfs2_wq, work: &osb->dquot_drop_work);
744 goto out;
745 }
746 status = ocfs2_lock_global_qf(oinfo, ex: 1);
747 if (status < 0)
748 goto out;
749 handle = ocfs2_start_trans(osb,
750 max_buffs: ocfs2_calc_qdel_credits(sb: dquot->dq_sb, type: dquot->dq_id.type));
751 if (IS_ERR(ptr: handle)) {
752 status = PTR_ERR(ptr: 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, addr: &dquot->dq_flags);
776out_trans:
777 ocfs2_commit_trans(osb, handle);
778out_ilock:
779 ocfs2_unlock_global_qf(oinfo, ex: 1);
780out:
781 mutex_unlock(lock: &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(val1: from_kqid(to: &init_user_ns, qid: dquot->dq_id),
805 val2: 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(oinfo: info, ex: 1);
812 if (status < 0)
813 goto out;
814 status = ocfs2_qinfo_lock(oinfo: info, ex: 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: &info->dqi_gi, dquot);
822 ocfs2_qinfo_unlock(oinfo: info, ex: 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(inode: gqinode, NULL,
837 new_i_size: i_size_read(inode: gqinode) + (need_alloc << sb->s_blocksize_bits),
838 zero_to: i_size_read(inode: gqinode));
839 if (status < 0)
840 goto out_dq;
841 }
842
843 handle = ocfs2_start_trans(osb,
844 max_buffs: ocfs2_calc_global_qinit_credits(sb, type));
845 if (IS_ERR(ptr: handle)) {
846 status = PTR_ERR(ptr: handle);
847 goto out_dq;
848 }
849 status = ocfs2_qinfo_lock(oinfo: info, ex);
850 if (status < 0)
851 goto out_trans;
852 status = qtree_write_dquot(info: &info->dqi_gi, dquot);
853 if (ex && info_dirty(info: sb_dqinfo(sb, type))) {
854 err = __ocfs2_global_write_info(sb, type);
855 if (!status)
856 status = err;
857 }
858 ocfs2_qinfo_unlock(oinfo: info, ex);
859out_trans:
860 ocfs2_commit_trans(osb, handle);
861out_dq:
862 ocfs2_unlock_global_qf(oinfo: info, ex: 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, addr: &dquot->dq_flags);
870out:
871 mutex_unlock(lock: &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(val1: from_kqid(to: &init_user_ns, qid: *qid), val2: type);
884 if (!sb_has_quota_loaded(sb, type)) {
885 status = -ESRCH;
886 goto out;
887 }
888 status = ocfs2_lock_global_qf(oinfo: info, ex: 0);
889 if (status < 0)
890 goto out;
891 status = ocfs2_qinfo_lock(oinfo: info, ex: 0);
892 if (status < 0)
893 goto out_global;
894 status = qtree_get_next_id(info: &info->dqi_gi, qid);
895 ocfs2_qinfo_unlock(oinfo: info, ex: 0);
896out_global:
897 ocfs2_unlock_global_qf(oinfo: info, ex: 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(val1: from_kqid(to: &init_user_ns, qid: dquot->dq_id),
925 val2: 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(lock: &dquot->dq_dqb_lock);
930 if (dquot->dq_flags & mask)
931 sync = 1;
932 spin_unlock(lock: &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, ex: 1);
940 if (status < 0)
941 goto out;
942 handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
943 if (IS_ERR(ptr: handle)) {
944 status = PTR_ERR(ptr: handle);
945 mlog_errno(status);
946 goto out_ilock;
947 }
948 down_write(sem: &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(sem: &sb_dqopt(sb)->dqio_sem);
958 ocfs2_commit_trans(osb, handle);
959out_ilock:
960 ocfs2_unlock_global_qf(oinfo, ex: 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, ex: 1);
975 if (status < 0)
976 goto out;
977 handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
978 if (IS_ERR(ptr: handle)) {
979 status = PTR_ERR(ptr: 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, ex: 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(k: 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(s: ocfs2_dquot_cachep, objp: 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};
1018

source code of linux/fs/ocfs2/quota_global.c