ia64/linux-2.6.18-xen.hg

view fs/dquot.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
1 /*
2 * Implementation of the diskquota system for the LINUX operating system. QUOTA
3 * is implemented using the BSD system call interface as the means of
4 * communication with the user level. This file contains the generic routines
5 * called by the different filesystems on allocation of an inode or block.
6 * These routines take care of the administration needed to have a consistent
7 * diskquota tracking system. The ideas of both user and group quotas are based
8 * on the Melbourne quota system as used on BSD derived systems. The internal
9 * implementation is based on one of the several variants of the LINUX
10 * inode-subsystem with added complexity of the diskquota system.
11 *
12 * Version: $Id: dquot.c,v 6.3 1996/11/17 18:35:34 mvw Exp mvw $
13 *
14 * Author: Marco van Wieringen <mvw@planets.elm.net>
15 *
16 * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
17 *
18 * Revised list management to avoid races
19 * -- Bill Hawes, <whawes@star.net>, 9/98
20 *
21 * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
22 * As the consequence the locking was moved from dquot_decr_...(),
23 * dquot_incr_...() to calling functions.
24 * invalidate_dquots() now writes modified dquots.
25 * Serialized quota_off() and quota_on() for mount point.
26 * Fixed a few bugs in grow_dquots().
27 * Fixed deadlock in write_dquot() - we no longer account quotas on
28 * quota files
29 * remove_dquot_ref() moved to inode.c - it now traverses through inodes
30 * add_dquot_ref() restarts after blocking
31 * Added check for bogus uid and fixed check for group in quotactl.
32 * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
33 *
34 * Used struct list_head instead of own list struct
35 * Invalidation of referenced dquots is no longer possible
36 * Improved free_dquots list management
37 * Quota and i_blocks are now updated in one place to avoid races
38 * Warnings are now delayed so we won't block in critical section
39 * Write updated not to require dquot lock
40 * Jan Kara, <jack@suse.cz>, 9/2000
41 *
42 * Added dynamic quota structure allocation
43 * Jan Kara <jack@suse.cz> 12/2000
44 *
45 * Rewritten quota interface. Implemented new quota format and
46 * formats registering.
47 * Jan Kara, <jack@suse.cz>, 2001,2002
48 *
49 * New SMP locking.
50 * Jan Kara, <jack@suse.cz>, 10/2002
51 *
52 * Added journalled quota support, fix lock inversion problems
53 * Jan Kara, <jack@suse.cz>, 2003,2004
54 *
55 * (C) Copyright 1994 - 1997 Marco van Wieringen
56 */
58 #include <linux/errno.h>
59 #include <linux/kernel.h>
60 #include <linux/fs.h>
61 #include <linux/mount.h>
62 #include <linux/mm.h>
63 #include <linux/time.h>
64 #include <linux/types.h>
65 #include <linux/string.h>
66 #include <linux/fcntl.h>
67 #include <linux/stat.h>
68 #include <linux/tty.h>
69 #include <linux/file.h>
70 #include <linux/slab.h>
71 #include <linux/sysctl.h>
72 #include <linux/smp_lock.h>
73 #include <linux/init.h>
74 #include <linux/module.h>
75 #include <linux/proc_fs.h>
76 #include <linux/security.h>
77 #include <linux/kmod.h>
78 #include <linux/namei.h>
79 #include <linux/buffer_head.h>
80 #include <linux/capability.h>
81 #include <linux/quotaops.h>
83 #include <asm/uaccess.h>
85 #define __DQUOT_PARANOIA
87 /*
88 * There are two quota SMP locks. dq_list_lock protects all lists with quotas
89 * and quota formats and also dqstats structure containing statistics about the
90 * lists. dq_data_lock protects data from dq_dqb and also mem_dqinfo structures
91 * and also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
92 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
93 * in inode_add_bytes() and inode_sub_bytes().
94 *
95 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock
96 *
97 * Note that some things (eg. sb pointer, type, id) doesn't change during
98 * the life of the dquot structure and so needn't to be protected by a lock
99 *
100 * Any operation working on dquots via inode pointers must hold dqptr_sem. If
101 * operation is just reading pointers from inode (or not using them at all) the
102 * read lock is enough. If pointers are altered function must hold write lock
103 * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
104 * for altering the flag i_mutex is also needed). If operation is holding
105 * reference to dquot in other way (e.g. quotactl ops) it must be guarded by
106 * dqonoff_mutex.
107 * This locking assures that:
108 * a) update/access to dquot pointers in inode is serialized
109 * b) everyone is guarded against invalidate_dquots()
110 *
111 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
112 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
113 * Currently dquot is locked only when it is being read to memory (or space for
114 * it is being allocated) on the first dqget() and when it is being released on
115 * the last dqput(). The allocation and release oparations are serialized by
116 * the dq_lock and by checking the use count in dquot_release(). Write
117 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
118 * spinlock to internal buffers before writing.
119 *
120 * Lock ordering (including related VFS locks) is the following:
121 * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
122 * dqio_mutex
123 * i_mutex on quota files is special (it's below dqio_mutex)
124 */
126 static DEFINE_SPINLOCK(dq_list_lock);
127 DEFINE_SPINLOCK(dq_data_lock);
129 static char *quotatypes[] = INITQFNAMES;
130 static struct quota_format_type *quota_formats; /* List of registered formats */
131 static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES;
133 /* SLAB cache for dquot structures */
134 static kmem_cache_t *dquot_cachep;
136 int register_quota_format(struct quota_format_type *fmt)
137 {
138 spin_lock(&dq_list_lock);
139 fmt->qf_next = quota_formats;
140 quota_formats = fmt;
141 spin_unlock(&dq_list_lock);
142 return 0;
143 }
145 void unregister_quota_format(struct quota_format_type *fmt)
146 {
147 struct quota_format_type **actqf;
149 spin_lock(&dq_list_lock);
150 for (actqf = &quota_formats; *actqf && *actqf != fmt; actqf = &(*actqf)->qf_next);
151 if (*actqf)
152 *actqf = (*actqf)->qf_next;
153 spin_unlock(&dq_list_lock);
154 }
156 static struct quota_format_type *find_quota_format(int id)
157 {
158 struct quota_format_type *actqf;
160 spin_lock(&dq_list_lock);
161 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
162 if (!actqf || !try_module_get(actqf->qf_owner)) {
163 int qm;
165 spin_unlock(&dq_list_lock);
167 for (qm = 0; module_names[qm].qm_fmt_id && module_names[qm].qm_fmt_id != id; qm++);
168 if (!module_names[qm].qm_fmt_id || request_module(module_names[qm].qm_mod_name))
169 return NULL;
171 spin_lock(&dq_list_lock);
172 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
173 if (actqf && !try_module_get(actqf->qf_owner))
174 actqf = NULL;
175 }
176 spin_unlock(&dq_list_lock);
177 return actqf;
178 }
180 static void put_quota_format(struct quota_format_type *fmt)
181 {
182 module_put(fmt->qf_owner);
183 }
185 /*
186 * Dquot List Management:
187 * The quota code uses three lists for dquot management: the inuse_list,
188 * free_dquots, and dquot_hash[] array. A single dquot structure may be
189 * on all three lists, depending on its current state.
190 *
191 * All dquots are placed to the end of inuse_list when first created, and this
192 * list is used for invalidate operation, which must look at every dquot.
193 *
194 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
195 * and this list is searched whenever we need an available dquot. Dquots are
196 * removed from the list as soon as they are used again, and
197 * dqstats.free_dquots gives the number of dquots on the list. When
198 * dquot is invalidated it's completely released from memory.
199 *
200 * Dquots with a specific identity (device, type and id) are placed on
201 * one of the dquot_hash[] hash chains. The provides an efficient search
202 * mechanism to locate a specific dquot.
203 */
205 static LIST_HEAD(inuse_list);
206 static LIST_HEAD(free_dquots);
207 static unsigned int dq_hash_bits, dq_hash_mask;
208 static struct hlist_head *dquot_hash;
210 struct dqstats dqstats;
212 static void dqput(struct dquot *dquot);
214 static inline unsigned int
215 hashfn(const struct super_block *sb, unsigned int id, int type)
216 {
217 unsigned long tmp;
219 tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
220 return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
221 }
223 /*
224 * Following list functions expect dq_list_lock to be held
225 */
226 static inline void insert_dquot_hash(struct dquot *dquot)
227 {
228 struct hlist_head *head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type);
229 hlist_add_head(&dquot->dq_hash, head);
230 }
232 static inline void remove_dquot_hash(struct dquot *dquot)
233 {
234 hlist_del_init(&dquot->dq_hash);
235 }
237 static inline struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, unsigned int id, int type)
238 {
239 struct hlist_node *node;
240 struct dquot *dquot;
242 hlist_for_each (node, dquot_hash+hashent) {
243 dquot = hlist_entry(node, struct dquot, dq_hash);
244 if (dquot->dq_sb == sb && dquot->dq_id == id && dquot->dq_type == type)
245 return dquot;
246 }
247 return NODQUOT;
248 }
250 /* Add a dquot to the tail of the free list */
251 static inline void put_dquot_last(struct dquot *dquot)
252 {
253 list_add_tail(&dquot->dq_free, &free_dquots);
254 dqstats.free_dquots++;
255 }
257 static inline void remove_free_dquot(struct dquot *dquot)
258 {
259 if (list_empty(&dquot->dq_free))
260 return;
261 list_del_init(&dquot->dq_free);
262 dqstats.free_dquots--;
263 }
265 static inline void put_inuse(struct dquot *dquot)
266 {
267 /* We add to the back of inuse list so we don't have to restart
268 * when traversing this list and we block */
269 list_add_tail(&dquot->dq_inuse, &inuse_list);
270 dqstats.allocated_dquots++;
271 }
273 static inline void remove_inuse(struct dquot *dquot)
274 {
275 dqstats.allocated_dquots--;
276 list_del(&dquot->dq_inuse);
277 }
278 /*
279 * End of list functions needing dq_list_lock
280 */
282 static void wait_on_dquot(struct dquot *dquot)
283 {
284 mutex_lock(&dquot->dq_lock);
285 mutex_unlock(&dquot->dq_lock);
286 }
288 #define mark_dquot_dirty(dquot) ((dquot)->dq_sb->dq_op->mark_dirty(dquot))
290 int dquot_mark_dquot_dirty(struct dquot *dquot)
291 {
292 spin_lock(&dq_list_lock);
293 if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags))
294 list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
295 info[dquot->dq_type].dqi_dirty_list);
296 spin_unlock(&dq_list_lock);
297 return 0;
298 }
300 /* This function needs dq_list_lock */
301 static inline int clear_dquot_dirty(struct dquot *dquot)
302 {
303 if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
304 return 0;
305 list_del_init(&dquot->dq_dirty);
306 return 1;
307 }
309 void mark_info_dirty(struct super_block *sb, int type)
310 {
311 set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
312 }
313 EXPORT_SYMBOL(mark_info_dirty);
315 /*
316 * Read dquot from disk and alloc space for it
317 */
319 int dquot_acquire(struct dquot *dquot)
320 {
321 int ret = 0, ret2 = 0;
322 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
324 mutex_lock(&dquot->dq_lock);
325 mutex_lock(&dqopt->dqio_mutex);
326 if (!test_bit(DQ_READ_B, &dquot->dq_flags))
327 ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
328 if (ret < 0)
329 goto out_iolock;
330 set_bit(DQ_READ_B, &dquot->dq_flags);
331 /* Instantiate dquot if needed */
332 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
333 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
334 /* Write the info if needed */
335 if (info_dirty(&dqopt->info[dquot->dq_type]))
336 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
337 if (ret < 0)
338 goto out_iolock;
339 if (ret2 < 0) {
340 ret = ret2;
341 goto out_iolock;
342 }
343 }
344 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
345 out_iolock:
346 mutex_unlock(&dqopt->dqio_mutex);
347 mutex_unlock(&dquot->dq_lock);
348 return ret;
349 }
351 /*
352 * Write dquot to disk
353 */
354 int dquot_commit(struct dquot *dquot)
355 {
356 int ret = 0, ret2 = 0;
357 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
359 mutex_lock(&dqopt->dqio_mutex);
360 spin_lock(&dq_list_lock);
361 if (!clear_dquot_dirty(dquot)) {
362 spin_unlock(&dq_list_lock);
363 goto out_sem;
364 }
365 spin_unlock(&dq_list_lock);
366 /* Inactive dquot can be only if there was error during read/init
367 * => we have better not writing it */
368 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
369 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
370 if (info_dirty(&dqopt->info[dquot->dq_type]))
371 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
372 if (ret >= 0)
373 ret = ret2;
374 }
375 out_sem:
376 mutex_unlock(&dqopt->dqio_mutex);
377 return ret;
378 }
380 /*
381 * Release dquot
382 */
383 int dquot_release(struct dquot *dquot)
384 {
385 int ret = 0, ret2 = 0;
386 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
388 mutex_lock(&dquot->dq_lock);
389 /* Check whether we are not racing with some other dqget() */
390 if (atomic_read(&dquot->dq_count) > 1)
391 goto out_dqlock;
392 mutex_lock(&dqopt->dqio_mutex);
393 if (dqopt->ops[dquot->dq_type]->release_dqblk) {
394 ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
395 /* Write the info */
396 if (info_dirty(&dqopt->info[dquot->dq_type]))
397 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
398 if (ret >= 0)
399 ret = ret2;
400 }
401 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
402 mutex_unlock(&dqopt->dqio_mutex);
403 out_dqlock:
404 mutex_unlock(&dquot->dq_lock);
405 return ret;
406 }
408 /* Invalidate all dquots on the list. Note that this function is called after
409 * quota is disabled and pointers from inodes removed so there cannot be new
410 * quota users. There can still be some users of quotas due to inodes being
411 * just deleted or pruned by prune_icache() (those are not attached to any
412 * list). We have to wait for such users.
413 */
414 static void invalidate_dquots(struct super_block *sb, int type)
415 {
416 struct dquot *dquot, *tmp;
418 restart:
419 spin_lock(&dq_list_lock);
420 list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
421 if (dquot->dq_sb != sb)
422 continue;
423 if (dquot->dq_type != type)
424 continue;
425 /* Wait for dquot users */
426 if (atomic_read(&dquot->dq_count)) {
427 DEFINE_WAIT(wait);
429 atomic_inc(&dquot->dq_count);
430 prepare_to_wait(&dquot->dq_wait_unused, &wait,
431 TASK_UNINTERRUPTIBLE);
432 spin_unlock(&dq_list_lock);
433 /* Once dqput() wakes us up, we know it's time to free
434 * the dquot.
435 * IMPORTANT: we rely on the fact that there is always
436 * at most one process waiting for dquot to free.
437 * Otherwise dq_count would be > 1 and we would never
438 * wake up.
439 */
440 if (atomic_read(&dquot->dq_count) > 1)
441 schedule();
442 finish_wait(&dquot->dq_wait_unused, &wait);
443 dqput(dquot);
444 /* At this moment dquot() need not exist (it could be
445 * reclaimed by prune_dqcache(). Hence we must
446 * restart. */
447 goto restart;
448 }
449 /*
450 * Quota now has no users and it has been written on last
451 * dqput()
452 */
453 remove_dquot_hash(dquot);
454 remove_free_dquot(dquot);
455 remove_inuse(dquot);
456 kmem_cache_free(dquot_cachep, dquot);
457 }
458 spin_unlock(&dq_list_lock);
459 }
461 int vfs_quota_sync(struct super_block *sb, int type)
462 {
463 struct list_head *dirty;
464 struct dquot *dquot;
465 struct quota_info *dqopt = sb_dqopt(sb);
466 int cnt;
468 mutex_lock(&dqopt->dqonoff_mutex);
469 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
470 if (type != -1 && cnt != type)
471 continue;
472 if (!sb_has_quota_enabled(sb, cnt))
473 continue;
474 spin_lock(&dq_list_lock);
475 dirty = &dqopt->info[cnt].dqi_dirty_list;
476 while (!list_empty(dirty)) {
477 dquot = list_entry(dirty->next, struct dquot, dq_dirty);
478 /* Dirty and inactive can be only bad dquot... */
479 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
480 clear_dquot_dirty(dquot);
481 continue;
482 }
483 /* Now we have active dquot from which someone is
484 * holding reference so we can safely just increase
485 * use count */
486 atomic_inc(&dquot->dq_count);
487 dqstats.lookups++;
488 spin_unlock(&dq_list_lock);
489 sb->dq_op->write_dquot(dquot);
490 dqput(dquot);
491 spin_lock(&dq_list_lock);
492 }
493 spin_unlock(&dq_list_lock);
494 }
496 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
497 if ((cnt == type || type == -1) && sb_has_quota_enabled(sb, cnt)
498 && info_dirty(&dqopt->info[cnt]))
499 sb->dq_op->write_info(sb, cnt);
500 spin_lock(&dq_list_lock);
501 dqstats.syncs++;
502 spin_unlock(&dq_list_lock);
503 mutex_unlock(&dqopt->dqonoff_mutex);
505 return 0;
506 }
508 /* Free unused dquots from cache */
509 static void prune_dqcache(int count)
510 {
511 struct list_head *head;
512 struct dquot *dquot;
514 head = free_dquots.prev;
515 while (head != &free_dquots && count) {
516 dquot = list_entry(head, struct dquot, dq_free);
517 remove_dquot_hash(dquot);
518 remove_free_dquot(dquot);
519 remove_inuse(dquot);
520 kmem_cache_free(dquot_cachep, dquot);
521 count--;
522 head = free_dquots.prev;
523 }
524 }
526 /*
527 * This is called from kswapd when we think we need some
528 * more memory
529 */
531 static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
532 {
533 if (nr) {
534 spin_lock(&dq_list_lock);
535 prune_dqcache(nr);
536 spin_unlock(&dq_list_lock);
537 }
538 return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure;
539 }
541 /*
542 * Put reference to dquot
543 * NOTE: If you change this function please check whether dqput_blocks() works right...
544 * MUST be called with either dqptr_sem or dqonoff_mutex held
545 */
546 static void dqput(struct dquot *dquot)
547 {
548 if (!dquot)
549 return;
550 #ifdef __DQUOT_PARANOIA
551 if (!atomic_read(&dquot->dq_count)) {
552 printk("VFS: dqput: trying to free free dquot\n");
553 printk("VFS: device %s, dquot of %s %d\n",
554 dquot->dq_sb->s_id,
555 quotatypes[dquot->dq_type],
556 dquot->dq_id);
557 BUG();
558 }
559 #endif
561 spin_lock(&dq_list_lock);
562 dqstats.drops++;
563 spin_unlock(&dq_list_lock);
564 we_slept:
565 spin_lock(&dq_list_lock);
566 if (atomic_read(&dquot->dq_count) > 1) {
567 /* We have more than one user... nothing to do */
568 atomic_dec(&dquot->dq_count);
569 /* Releasing dquot during quotaoff phase? */
570 if (!sb_has_quota_enabled(dquot->dq_sb, dquot->dq_type) &&
571 atomic_read(&dquot->dq_count) == 1)
572 wake_up(&dquot->dq_wait_unused);
573 spin_unlock(&dq_list_lock);
574 return;
575 }
576 /* Need to release dquot? */
577 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
578 spin_unlock(&dq_list_lock);
579 /* Commit dquot before releasing */
580 dquot->dq_sb->dq_op->write_dquot(dquot);
581 goto we_slept;
582 }
583 /* Clear flag in case dquot was inactive (something bad happened) */
584 clear_dquot_dirty(dquot);
585 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
586 spin_unlock(&dq_list_lock);
587 dquot->dq_sb->dq_op->release_dquot(dquot);
588 goto we_slept;
589 }
590 atomic_dec(&dquot->dq_count);
591 #ifdef __DQUOT_PARANOIA
592 /* sanity check */
593 BUG_ON(!list_empty(&dquot->dq_free));
594 #endif
595 put_dquot_last(dquot);
596 spin_unlock(&dq_list_lock);
597 }
599 static struct dquot *get_empty_dquot(struct super_block *sb, int type)
600 {
601 struct dquot *dquot;
603 dquot = kmem_cache_alloc(dquot_cachep, SLAB_NOFS);
604 if(!dquot)
605 return NODQUOT;
607 memset((caddr_t)dquot, 0, sizeof(struct dquot));
608 mutex_init(&dquot->dq_lock);
609 INIT_LIST_HEAD(&dquot->dq_free);
610 INIT_LIST_HEAD(&dquot->dq_inuse);
611 INIT_HLIST_NODE(&dquot->dq_hash);
612 INIT_LIST_HEAD(&dquot->dq_dirty);
613 init_waitqueue_head(&dquot->dq_wait_unused);
614 dquot->dq_sb = sb;
615 dquot->dq_type = type;
616 atomic_set(&dquot->dq_count, 1);
618 return dquot;
619 }
621 /*
622 * Get reference to dquot
623 * MUST be called with either dqptr_sem or dqonoff_mutex held
624 */
625 static struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
626 {
627 unsigned int hashent = hashfn(sb, id, type);
628 struct dquot *dquot, *empty = NODQUOT;
630 if (!sb_has_quota_enabled(sb, type))
631 return NODQUOT;
632 we_slept:
633 spin_lock(&dq_list_lock);
634 if ((dquot = find_dquot(hashent, sb, id, type)) == NODQUOT) {
635 if (empty == NODQUOT) {
636 spin_unlock(&dq_list_lock);
637 if ((empty = get_empty_dquot(sb, type)) == NODQUOT)
638 schedule(); /* Try to wait for a moment... */
639 goto we_slept;
640 }
641 dquot = empty;
642 dquot->dq_id = id;
643 /* all dquots go on the inuse_list */
644 put_inuse(dquot);
645 /* hash it first so it can be found */
646 insert_dquot_hash(dquot);
647 dqstats.lookups++;
648 spin_unlock(&dq_list_lock);
649 } else {
650 if (!atomic_read(&dquot->dq_count))
651 remove_free_dquot(dquot);
652 atomic_inc(&dquot->dq_count);
653 dqstats.cache_hits++;
654 dqstats.lookups++;
655 spin_unlock(&dq_list_lock);
656 if (empty)
657 kmem_cache_free(dquot_cachep, empty);
658 }
659 /* Wait for dq_lock - after this we know that either dquot_release() is already
660 * finished or it will be canceled due to dq_count > 1 test */
661 wait_on_dquot(dquot);
662 /* Read the dquot and instantiate it (everything done only if needed) */
663 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && sb->dq_op->acquire_dquot(dquot) < 0) {
664 dqput(dquot);
665 return NODQUOT;
666 }
667 #ifdef __DQUOT_PARANOIA
668 BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
669 #endif
671 return dquot;
672 }
674 static int dqinit_needed(struct inode *inode, int type)
675 {
676 int cnt;
678 if (IS_NOQUOTA(inode))
679 return 0;
680 if (type != -1)
681 return inode->i_dquot[type] == NODQUOT;
682 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
683 if (inode->i_dquot[cnt] == NODQUOT)
684 return 1;
685 return 0;
686 }
688 /* This routine is guarded by dqonoff_mutex mutex */
689 static void add_dquot_ref(struct super_block *sb, int type)
690 {
691 struct list_head *p;
693 restart:
694 file_list_lock();
695 list_for_each(p, &sb->s_files) {
696 struct file *filp = list_entry(p, struct file, f_u.fu_list);
697 struct inode *inode = filp->f_dentry->d_inode;
698 if (filp->f_mode & FMODE_WRITE && dqinit_needed(inode, type)) {
699 struct dentry *dentry = dget(filp->f_dentry);
700 file_list_unlock();
701 sb->dq_op->initialize(inode, type);
702 dput(dentry);
703 /* As we may have blocked we had better restart... */
704 goto restart;
705 }
706 }
707 file_list_unlock();
708 }
710 /* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */
711 static inline int dqput_blocks(struct dquot *dquot)
712 {
713 if (atomic_read(&dquot->dq_count) <= 1)
714 return 1;
715 return 0;
716 }
718 /* Remove references to dquots from inode - add dquot to list for freeing if needed */
719 /* We can't race with anybody because we hold dqptr_sem for writing... */
720 int remove_inode_dquot_ref(struct inode *inode, int type, struct list_head *tofree_head)
721 {
722 struct dquot *dquot = inode->i_dquot[type];
724 inode->i_dquot[type] = NODQUOT;
725 if (dquot != NODQUOT) {
726 if (dqput_blocks(dquot)) {
727 #ifdef __DQUOT_PARANOIA
728 if (atomic_read(&dquot->dq_count) != 1)
729 printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count));
730 #endif
731 spin_lock(&dq_list_lock);
732 list_add(&dquot->dq_free, tofree_head); /* As dquot must have currently users it can't be on the free list... */
733 spin_unlock(&dq_list_lock);
734 return 1;
735 }
736 else
737 dqput(dquot); /* We have guaranteed we won't block */
738 }
739 return 0;
740 }
742 /* Free list of dquots - called from inode.c */
743 /* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */
744 static void put_dquot_list(struct list_head *tofree_head)
745 {
746 struct list_head *act_head;
747 struct dquot *dquot;
749 act_head = tofree_head->next;
750 /* So now we have dquots on the list... Just free them */
751 while (act_head != tofree_head) {
752 dquot = list_entry(act_head, struct dquot, dq_free);
753 act_head = act_head->next;
754 list_del_init(&dquot->dq_free); /* Remove dquot from the list so we won't have problems... */
755 dqput(dquot);
756 }
757 }
759 /* Gather all references from inodes and drop them */
760 static void drop_dquot_ref(struct super_block *sb, int type)
761 {
762 LIST_HEAD(tofree_head);
764 down_write(&sb_dqopt(sb)->dqptr_sem);
765 remove_dquot_ref(sb, type, &tofree_head);
766 up_write(&sb_dqopt(sb)->dqptr_sem);
767 put_dquot_list(&tofree_head);
768 }
770 static inline void dquot_incr_inodes(struct dquot *dquot, unsigned long number)
771 {
772 dquot->dq_dqb.dqb_curinodes += number;
773 }
775 static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
776 {
777 dquot->dq_dqb.dqb_curspace += number;
778 }
780 static inline void dquot_decr_inodes(struct dquot *dquot, unsigned long number)
781 {
782 if (dquot->dq_dqb.dqb_curinodes > number)
783 dquot->dq_dqb.dqb_curinodes -= number;
784 else
785 dquot->dq_dqb.dqb_curinodes = 0;
786 if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
787 dquot->dq_dqb.dqb_itime = (time_t) 0;
788 clear_bit(DQ_INODES_B, &dquot->dq_flags);
789 }
791 static inline void dquot_decr_space(struct dquot *dquot, qsize_t number)
792 {
793 if (dquot->dq_dqb.dqb_curspace > number)
794 dquot->dq_dqb.dqb_curspace -= number;
795 else
796 dquot->dq_dqb.dqb_curspace = 0;
797 if (toqb(dquot->dq_dqb.dqb_curspace) <= dquot->dq_dqb.dqb_bsoftlimit)
798 dquot->dq_dqb.dqb_btime = (time_t) 0;
799 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
800 }
802 static int flag_print_warnings = 1;
804 static inline int need_print_warning(struct dquot *dquot)
805 {
806 if (!flag_print_warnings)
807 return 0;
809 switch (dquot->dq_type) {
810 case USRQUOTA:
811 return current->fsuid == dquot->dq_id;
812 case GRPQUOTA:
813 return in_group_p(dquot->dq_id);
814 }
815 return 0;
816 }
818 /* Values of warnings */
819 #define NOWARN 0
820 #define IHARDWARN 1
821 #define ISOFTLONGWARN 2
822 #define ISOFTWARN 3
823 #define BHARDWARN 4
824 #define BSOFTLONGWARN 5
825 #define BSOFTWARN 6
827 /* Print warning to user which exceeded quota */
828 static void print_warning(struct dquot *dquot, const char warntype)
829 {
830 char *msg = NULL;
831 int flag = (warntype == BHARDWARN || warntype == BSOFTLONGWARN) ? DQ_BLKS_B :
832 ((warntype == IHARDWARN || warntype == ISOFTLONGWARN) ? DQ_INODES_B : 0);
834 if (!need_print_warning(dquot) || (flag && test_and_set_bit(flag, &dquot->dq_flags)))
835 return;
837 tty_write_message(current->signal->tty, dquot->dq_sb->s_id);
838 if (warntype == ISOFTWARN || warntype == BSOFTWARN)
839 tty_write_message(current->signal->tty, ": warning, ");
840 else
841 tty_write_message(current->signal->tty, ": write failed, ");
842 tty_write_message(current->signal->tty, quotatypes[dquot->dq_type]);
843 switch (warntype) {
844 case IHARDWARN:
845 msg = " file limit reached.\r\n";
846 break;
847 case ISOFTLONGWARN:
848 msg = " file quota exceeded too long.\r\n";
849 break;
850 case ISOFTWARN:
851 msg = " file quota exceeded.\r\n";
852 break;
853 case BHARDWARN:
854 msg = " block limit reached.\r\n";
855 break;
856 case BSOFTLONGWARN:
857 msg = " block quota exceeded too long.\r\n";
858 break;
859 case BSOFTWARN:
860 msg = " block quota exceeded.\r\n";
861 break;
862 }
863 tty_write_message(current->signal->tty, msg);
864 }
866 static inline void flush_warnings(struct dquot **dquots, char *warntype)
867 {
868 int i;
870 for (i = 0; i < MAXQUOTAS; i++)
871 if (dquots[i] != NODQUOT && warntype[i] != NOWARN)
872 print_warning(dquots[i], warntype[i]);
873 }
875 static inline char ignore_hardlimit(struct dquot *dquot)
876 {
877 struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
879 return capable(CAP_SYS_RESOURCE) &&
880 (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || !(info->dqi_flags & V1_DQF_RSQUASH));
881 }
883 /* needs dq_data_lock */
884 static int check_idq(struct dquot *dquot, ulong inodes, char *warntype)
885 {
886 *warntype = NOWARN;
887 if (inodes <= 0 || test_bit(DQ_FAKE_B, &dquot->dq_flags))
888 return QUOTA_OK;
890 if (dquot->dq_dqb.dqb_ihardlimit &&
891 (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_ihardlimit &&
892 !ignore_hardlimit(dquot)) {
893 *warntype = IHARDWARN;
894 return NO_QUOTA;
895 }
897 if (dquot->dq_dqb.dqb_isoftlimit &&
898 (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit &&
899 dquot->dq_dqb.dqb_itime && get_seconds() >= dquot->dq_dqb.dqb_itime &&
900 !ignore_hardlimit(dquot)) {
901 *warntype = ISOFTLONGWARN;
902 return NO_QUOTA;
903 }
905 if (dquot->dq_dqb.dqb_isoftlimit &&
906 (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit &&
907 dquot->dq_dqb.dqb_itime == 0) {
908 *warntype = ISOFTWARN;
909 dquot->dq_dqb.dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
910 }
912 return QUOTA_OK;
913 }
915 /* needs dq_data_lock */
916 static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype)
917 {
918 *warntype = 0;
919 if (space <= 0 || test_bit(DQ_FAKE_B, &dquot->dq_flags))
920 return QUOTA_OK;
922 if (dquot->dq_dqb.dqb_bhardlimit &&
923 toqb(dquot->dq_dqb.dqb_curspace + space) > dquot->dq_dqb.dqb_bhardlimit &&
924 !ignore_hardlimit(dquot)) {
925 if (!prealloc)
926 *warntype = BHARDWARN;
927 return NO_QUOTA;
928 }
930 if (dquot->dq_dqb.dqb_bsoftlimit &&
931 toqb(dquot->dq_dqb.dqb_curspace + space) > dquot->dq_dqb.dqb_bsoftlimit &&
932 dquot->dq_dqb.dqb_btime && get_seconds() >= dquot->dq_dqb.dqb_btime &&
933 !ignore_hardlimit(dquot)) {
934 if (!prealloc)
935 *warntype = BSOFTLONGWARN;
936 return NO_QUOTA;
937 }
939 if (dquot->dq_dqb.dqb_bsoftlimit &&
940 toqb(dquot->dq_dqb.dqb_curspace + space) > dquot->dq_dqb.dqb_bsoftlimit &&
941 dquot->dq_dqb.dqb_btime == 0) {
942 if (!prealloc) {
943 *warntype = BSOFTWARN;
944 dquot->dq_dqb.dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace;
945 }
946 else
947 /*
948 * We don't allow preallocation to exceed softlimit so exceeding will
949 * be always printed
950 */
951 return NO_QUOTA;
952 }
954 return QUOTA_OK;
955 }
957 /*
958 * Initialize quota pointers in inode
959 * Transaction must be started at entry
960 */
961 int dquot_initialize(struct inode *inode, int type)
962 {
963 unsigned int id = 0;
964 int cnt, ret = 0;
966 /* First test before acquiring mutex - solves deadlocks when we
967 * re-enter the quota code and are already holding the mutex */
968 if (IS_NOQUOTA(inode))
969 return 0;
970 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
971 /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
972 if (IS_NOQUOTA(inode))
973 goto out_err;
974 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
975 if (type != -1 && cnt != type)
976 continue;
977 if (inode->i_dquot[cnt] == NODQUOT) {
978 switch (cnt) {
979 case USRQUOTA:
980 id = inode->i_uid;
981 break;
982 case GRPQUOTA:
983 id = inode->i_gid;
984 break;
985 }
986 inode->i_dquot[cnt] = dqget(inode->i_sb, id, cnt);
987 }
988 }
989 out_err:
990 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
991 return ret;
992 }
994 /*
995 * Release all quotas referenced by inode
996 * Transaction must be started at an entry
997 */
998 int dquot_drop(struct inode *inode)
999 {
1000 int cnt;
1002 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1003 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1004 if (inode->i_dquot[cnt] != NODQUOT) {
1005 dqput(inode->i_dquot[cnt]);
1006 inode->i_dquot[cnt] = NODQUOT;
1009 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1010 return 0;
1013 /*
1014 * Following four functions update i_blocks+i_bytes fields and
1015 * quota information (together with appropriate checks)
1016 * NOTE: We absolutely rely on the fact that caller dirties
1017 * the inode (usually macros in quotaops.h care about this) and
1018 * holds a handle for the current transaction so that dquot write and
1019 * inode write go into the same transaction.
1020 */
1022 /*
1023 * This operation can block, but only after everything is updated
1024 */
1025 int dquot_alloc_space(struct inode *inode, qsize_t number, int warn)
1027 int cnt, ret = NO_QUOTA;
1028 char warntype[MAXQUOTAS];
1030 /* First test before acquiring mutex - solves deadlocks when we
1031 * re-enter the quota code and are already holding the mutex */
1032 if (IS_NOQUOTA(inode)) {
1033 out_add:
1034 inode_add_bytes(inode, number);
1035 return QUOTA_OK;
1037 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1038 warntype[cnt] = NOWARN;
1040 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1041 if (IS_NOQUOTA(inode)) { /* Now we can do reliable test... */
1042 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1043 goto out_add;
1045 spin_lock(&dq_data_lock);
1046 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1047 if (inode->i_dquot[cnt] == NODQUOT)
1048 continue;
1049 if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) == NO_QUOTA)
1050 goto warn_put_all;
1052 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1053 if (inode->i_dquot[cnt] == NODQUOT)
1054 continue;
1055 dquot_incr_space(inode->i_dquot[cnt], number);
1057 inode_add_bytes(inode, number);
1058 ret = QUOTA_OK;
1059 warn_put_all:
1060 spin_unlock(&dq_data_lock);
1061 if (ret == QUOTA_OK)
1062 /* Dirtify all the dquots - this can block when journalling */
1063 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1064 if (inode->i_dquot[cnt])
1065 mark_dquot_dirty(inode->i_dquot[cnt]);
1066 flush_warnings(inode->i_dquot, warntype);
1067 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1068 return ret;
1071 /*
1072 * This operation can block, but only after everything is updated
1073 */
1074 int dquot_alloc_inode(const struct inode *inode, unsigned long number)
1076 int cnt, ret = NO_QUOTA;
1077 char warntype[MAXQUOTAS];
1079 /* First test before acquiring mutex - solves deadlocks when we
1080 * re-enter the quota code and are already holding the mutex */
1081 if (IS_NOQUOTA(inode))
1082 return QUOTA_OK;
1083 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1084 warntype[cnt] = NOWARN;
1085 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1086 if (IS_NOQUOTA(inode)) {
1087 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1088 return QUOTA_OK;
1090 spin_lock(&dq_data_lock);
1091 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1092 if (inode->i_dquot[cnt] == NODQUOT)
1093 continue;
1094 if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) == NO_QUOTA)
1095 goto warn_put_all;
1098 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1099 if (inode->i_dquot[cnt] == NODQUOT)
1100 continue;
1101 dquot_incr_inodes(inode->i_dquot[cnt], number);
1103 ret = QUOTA_OK;
1104 warn_put_all:
1105 spin_unlock(&dq_data_lock);
1106 if (ret == QUOTA_OK)
1107 /* Dirtify all the dquots - this can block when journalling */
1108 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1109 if (inode->i_dquot[cnt])
1110 mark_dquot_dirty(inode->i_dquot[cnt]);
1111 flush_warnings((struct dquot **)inode->i_dquot, warntype);
1112 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1113 return ret;
1116 /*
1117 * This operation can block, but only after everything is updated
1118 */
1119 int dquot_free_space(struct inode *inode, qsize_t number)
1121 unsigned int cnt;
1123 /* First test before acquiring mutex - solves deadlocks when we
1124 * re-enter the quota code and are already holding the mutex */
1125 if (IS_NOQUOTA(inode)) {
1126 out_sub:
1127 inode_sub_bytes(inode, number);
1128 return QUOTA_OK;
1130 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1131 /* Now recheck reliably when holding dqptr_sem */
1132 if (IS_NOQUOTA(inode)) {
1133 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1134 goto out_sub;
1136 spin_lock(&dq_data_lock);
1137 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1138 if (inode->i_dquot[cnt] == NODQUOT)
1139 continue;
1140 dquot_decr_space(inode->i_dquot[cnt], number);
1142 inode_sub_bytes(inode, number);
1143 spin_unlock(&dq_data_lock);
1144 /* Dirtify all the dquots - this can block when journalling */
1145 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1146 if (inode->i_dquot[cnt])
1147 mark_dquot_dirty(inode->i_dquot[cnt]);
1148 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1149 return QUOTA_OK;
1152 /*
1153 * This operation can block, but only after everything is updated
1154 */
1155 int dquot_free_inode(const struct inode *inode, unsigned long number)
1157 unsigned int cnt;
1159 /* First test before acquiring mutex - solves deadlocks when we
1160 * re-enter the quota code and are already holding the mutex */
1161 if (IS_NOQUOTA(inode))
1162 return QUOTA_OK;
1163 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1164 /* Now recheck reliably when holding dqptr_sem */
1165 if (IS_NOQUOTA(inode)) {
1166 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1167 return QUOTA_OK;
1169 spin_lock(&dq_data_lock);
1170 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1171 if (inode->i_dquot[cnt] == NODQUOT)
1172 continue;
1173 dquot_decr_inodes(inode->i_dquot[cnt], number);
1175 spin_unlock(&dq_data_lock);
1176 /* Dirtify all the dquots - this can block when journalling */
1177 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1178 if (inode->i_dquot[cnt])
1179 mark_dquot_dirty(inode->i_dquot[cnt]);
1180 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1181 return QUOTA_OK;
1184 /*
1185 * Transfer the number of inode and blocks from one diskquota to an other.
1187 * This operation can block, but only after everything is updated
1188 * A transaction must be started when entering this function.
1189 */
1190 int dquot_transfer(struct inode *inode, struct iattr *iattr)
1192 qsize_t space;
1193 struct dquot *transfer_from[MAXQUOTAS];
1194 struct dquot *transfer_to[MAXQUOTAS];
1195 int cnt, ret = NO_QUOTA, chuid = (iattr->ia_valid & ATTR_UID) && inode->i_uid != iattr->ia_uid,
1196 chgid = (iattr->ia_valid & ATTR_GID) && inode->i_gid != iattr->ia_gid;
1197 char warntype[MAXQUOTAS];
1199 /* First test before acquiring mutex - solves deadlocks when we
1200 * re-enter the quota code and are already holding the mutex */
1201 if (IS_NOQUOTA(inode))
1202 return QUOTA_OK;
1203 /* Clear the arrays */
1204 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1205 transfer_to[cnt] = transfer_from[cnt] = NODQUOT;
1206 warntype[cnt] = NOWARN;
1208 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1209 /* Now recheck reliably when holding dqptr_sem */
1210 if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
1211 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1212 return QUOTA_OK;
1214 /* First build the transfer_to list - here we can block on
1215 * reading/instantiating of dquots. We know that the transaction for
1216 * us was already started so we don't violate lock ranking here */
1217 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1218 switch (cnt) {
1219 case USRQUOTA:
1220 if (!chuid)
1221 continue;
1222 transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_uid, cnt);
1223 break;
1224 case GRPQUOTA:
1225 if (!chgid)
1226 continue;
1227 transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_gid, cnt);
1228 break;
1231 spin_lock(&dq_data_lock);
1232 space = inode_get_bytes(inode);
1233 /* Build the transfer_from list and check the limits */
1234 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1235 if (transfer_to[cnt] == NODQUOT)
1236 continue;
1237 transfer_from[cnt] = inode->i_dquot[cnt];
1238 if (check_idq(transfer_to[cnt], 1, warntype+cnt) == NO_QUOTA ||
1239 check_bdq(transfer_to[cnt], space, 0, warntype+cnt) == NO_QUOTA)
1240 goto warn_put_all;
1243 /*
1244 * Finally perform the needed transfer from transfer_from to transfer_to
1245 */
1246 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1247 /*
1248 * Skip changes for same uid or gid or for turned off quota-type.
1249 */
1250 if (transfer_to[cnt] == NODQUOT)
1251 continue;
1253 /* Due to IO error we might not have transfer_from[] structure */
1254 if (transfer_from[cnt]) {
1255 dquot_decr_inodes(transfer_from[cnt], 1);
1256 dquot_decr_space(transfer_from[cnt], space);
1259 dquot_incr_inodes(transfer_to[cnt], 1);
1260 dquot_incr_space(transfer_to[cnt], space);
1262 inode->i_dquot[cnt] = transfer_to[cnt];
1264 ret = QUOTA_OK;
1265 warn_put_all:
1266 spin_unlock(&dq_data_lock);
1267 /* Dirtify all the dquots - this can block when journalling */
1268 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1269 if (transfer_from[cnt])
1270 mark_dquot_dirty(transfer_from[cnt]);
1271 if (transfer_to[cnt])
1272 mark_dquot_dirty(transfer_to[cnt]);
1274 flush_warnings(transfer_to, warntype);
1276 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1277 if (ret == QUOTA_OK && transfer_from[cnt] != NODQUOT)
1278 dqput(transfer_from[cnt]);
1279 if (ret == NO_QUOTA && transfer_to[cnt] != NODQUOT)
1280 dqput(transfer_to[cnt]);
1282 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1283 return ret;
1286 /*
1287 * Write info of quota file to disk
1288 */
1289 int dquot_commit_info(struct super_block *sb, int type)
1291 int ret;
1292 struct quota_info *dqopt = sb_dqopt(sb);
1294 mutex_lock(&dqopt->dqio_mutex);
1295 ret = dqopt->ops[type]->write_file_info(sb, type);
1296 mutex_unlock(&dqopt->dqio_mutex);
1297 return ret;
1300 /*
1301 * Definitions of diskquota operations.
1302 */
1303 struct dquot_operations dquot_operations = {
1304 .initialize = dquot_initialize,
1305 .drop = dquot_drop,
1306 .alloc_space = dquot_alloc_space,
1307 .alloc_inode = dquot_alloc_inode,
1308 .free_space = dquot_free_space,
1309 .free_inode = dquot_free_inode,
1310 .transfer = dquot_transfer,
1311 .write_dquot = dquot_commit,
1312 .acquire_dquot = dquot_acquire,
1313 .release_dquot = dquot_release,
1314 .mark_dirty = dquot_mark_dquot_dirty,
1315 .write_info = dquot_commit_info
1316 };
1318 static inline void set_enable_flags(struct quota_info *dqopt, int type)
1320 switch (type) {
1321 case USRQUOTA:
1322 dqopt->flags |= DQUOT_USR_ENABLED;
1323 break;
1324 case GRPQUOTA:
1325 dqopt->flags |= DQUOT_GRP_ENABLED;
1326 break;
1330 static inline void reset_enable_flags(struct quota_info *dqopt, int type)
1332 switch (type) {
1333 case USRQUOTA:
1334 dqopt->flags &= ~DQUOT_USR_ENABLED;
1335 break;
1336 case GRPQUOTA:
1337 dqopt->flags &= ~DQUOT_GRP_ENABLED;
1338 break;
1342 /*
1343 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1344 */
1345 int vfs_quota_off(struct super_block *sb, int type)
1347 int cnt;
1348 struct quota_info *dqopt = sb_dqopt(sb);
1349 struct inode *toputinode[MAXQUOTAS];
1351 /* We need to serialize quota_off() for device */
1352 mutex_lock(&dqopt->dqonoff_mutex);
1353 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1354 toputinode[cnt] = NULL;
1355 if (type != -1 && cnt != type)
1356 continue;
1357 if (!sb_has_quota_enabled(sb, cnt))
1358 continue;
1359 reset_enable_flags(dqopt, cnt);
1361 /* Note: these are blocking operations */
1362 drop_dquot_ref(sb, cnt);
1363 invalidate_dquots(sb, cnt);
1364 /*
1365 * Now all dquots should be invalidated, all writes done so we should be only
1366 * users of the info. No locks needed.
1367 */
1368 if (info_dirty(&dqopt->info[cnt]))
1369 sb->dq_op->write_info(sb, cnt);
1370 if (dqopt->ops[cnt]->free_file_info)
1371 dqopt->ops[cnt]->free_file_info(sb, cnt);
1372 put_quota_format(dqopt->info[cnt].dqi_format);
1374 toputinode[cnt] = dqopt->files[cnt];
1375 dqopt->files[cnt] = NULL;
1376 dqopt->info[cnt].dqi_flags = 0;
1377 dqopt->info[cnt].dqi_igrace = 0;
1378 dqopt->info[cnt].dqi_bgrace = 0;
1379 dqopt->ops[cnt] = NULL;
1381 mutex_unlock(&dqopt->dqonoff_mutex);
1382 /* Sync the superblock so that buffers with quota data are written to
1383 * disk (and so userspace sees correct data afterwards). */
1384 if (sb->s_op->sync_fs)
1385 sb->s_op->sync_fs(sb, 1);
1386 sync_blockdev(sb->s_bdev);
1387 /* Now the quota files are just ordinary files and we can set the
1388 * inode flags back. Moreover we discard the pagecache so that
1389 * userspace sees the writes we did bypassing the pagecache. We
1390 * must also discard the blockdev buffers so that we see the
1391 * changes done by userspace on the next quotaon() */
1392 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1393 if (toputinode[cnt]) {
1394 mutex_lock(&dqopt->dqonoff_mutex);
1395 /* If quota was reenabled in the meantime, we have
1396 * nothing to do */
1397 if (!sb_has_quota_enabled(sb, cnt)) {
1398 mutex_lock(&toputinode[cnt]->i_mutex);
1399 toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
1400 S_NOATIME | S_NOQUOTA);
1401 truncate_inode_pages(&toputinode[cnt]->i_data, 0);
1402 mutex_unlock(&toputinode[cnt]->i_mutex);
1403 mark_inode_dirty(toputinode[cnt]);
1404 iput(toputinode[cnt]);
1406 mutex_unlock(&dqopt->dqonoff_mutex);
1408 if (sb->s_bdev)
1409 invalidate_bdev(sb->s_bdev, 0);
1410 return 0;
1413 /*
1414 * Turn quotas on on a device
1415 */
1417 /* Helper function when we already have the inode */
1418 static int vfs_quota_on_inode(struct inode *inode, int type, int format_id)
1420 struct quota_format_type *fmt = find_quota_format(format_id);
1421 struct super_block *sb = inode->i_sb;
1422 struct quota_info *dqopt = sb_dqopt(sb);
1423 int error;
1424 int oldflags = -1;
1426 if (!fmt)
1427 return -ESRCH;
1428 if (!S_ISREG(inode->i_mode)) {
1429 error = -EACCES;
1430 goto out_fmt;
1432 if (IS_RDONLY(inode)) {
1433 error = -EROFS;
1434 goto out_fmt;
1436 if (!sb->s_op->quota_write || !sb->s_op->quota_read) {
1437 error = -EINVAL;
1438 goto out_fmt;
1441 /* As we bypass the pagecache we must now flush the inode so that
1442 * we see all the changes from userspace... */
1443 write_inode_now(inode, 1);
1444 /* And now flush the block cache so that kernel sees the changes */
1445 invalidate_bdev(sb->s_bdev, 0);
1446 mutex_lock(&inode->i_mutex);
1447 mutex_lock(&dqopt->dqonoff_mutex);
1448 if (sb_has_quota_enabled(sb, type)) {
1449 error = -EBUSY;
1450 goto out_lock;
1452 /* We don't want quota and atime on quota files (deadlocks possible)
1453 * Also nobody should write to the file - we use special IO operations
1454 * which ignore the immutable bit. */
1455 down_write(&dqopt->dqptr_sem);
1456 oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | S_NOQUOTA);
1457 inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
1458 up_write(&dqopt->dqptr_sem);
1459 sb->dq_op->drop(inode);
1461 error = -EIO;
1462 dqopt->files[type] = igrab(inode);
1463 if (!dqopt->files[type])
1464 goto out_lock;
1465 error = -EINVAL;
1466 if (!fmt->qf_ops->check_quota_file(sb, type))
1467 goto out_file_init;
1469 dqopt->ops[type] = fmt->qf_ops;
1470 dqopt->info[type].dqi_format = fmt;
1471 INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
1472 mutex_lock(&dqopt->dqio_mutex);
1473 if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) {
1474 mutex_unlock(&dqopt->dqio_mutex);
1475 goto out_file_init;
1477 mutex_unlock(&dqopt->dqio_mutex);
1478 mutex_unlock(&inode->i_mutex);
1479 set_enable_flags(dqopt, type);
1481 add_dquot_ref(sb, type);
1482 mutex_unlock(&dqopt->dqonoff_mutex);
1484 return 0;
1486 out_file_init:
1487 dqopt->files[type] = NULL;
1488 iput(inode);
1489 out_lock:
1490 mutex_unlock(&dqopt->dqonoff_mutex);
1491 if (oldflags != -1) {
1492 down_write(&dqopt->dqptr_sem);
1493 /* Set the flags back (in the case of accidental quotaon()
1494 * on a wrong file we don't want to mess up the flags) */
1495 inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
1496 inode->i_flags |= oldflags;
1497 up_write(&dqopt->dqptr_sem);
1499 mutex_unlock(&inode->i_mutex);
1500 out_fmt:
1501 put_quota_format(fmt);
1503 return error;
1506 /* Actual function called from quotactl() */
1507 int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path)
1509 struct nameidata nd;
1510 int error;
1512 error = path_lookup(path, LOOKUP_FOLLOW, &nd);
1513 if (error < 0)
1514 return error;
1515 error = security_quota_on(nd.dentry);
1516 if (error)
1517 goto out_path;
1518 /* Quota file not on the same filesystem? */
1519 if (nd.mnt->mnt_sb != sb)
1520 error = -EXDEV;
1521 else
1522 error = vfs_quota_on_inode(nd.dentry->d_inode, type, format_id);
1523 out_path:
1524 path_release(&nd);
1525 return error;
1528 /*
1529 * This function is used when filesystem needs to initialize quotas
1530 * during mount time.
1531 */
1532 int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
1533 int format_id, int type)
1535 struct dentry *dentry;
1536 int error;
1538 dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
1539 if (IS_ERR(dentry))
1540 return PTR_ERR(dentry);
1542 if (!dentry->d_inode) {
1543 error = -ENOENT;
1544 goto out;
1547 error = security_quota_on(dentry);
1548 if (!error)
1549 error = vfs_quota_on_inode(dentry->d_inode, type, format_id);
1551 out:
1552 dput(dentry);
1553 return error;
1556 /* Generic routine for getting common part of quota structure */
1557 static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di)
1559 struct mem_dqblk *dm = &dquot->dq_dqb;
1561 spin_lock(&dq_data_lock);
1562 di->dqb_bhardlimit = dm->dqb_bhardlimit;
1563 di->dqb_bsoftlimit = dm->dqb_bsoftlimit;
1564 di->dqb_curspace = dm->dqb_curspace;
1565 di->dqb_ihardlimit = dm->dqb_ihardlimit;
1566 di->dqb_isoftlimit = dm->dqb_isoftlimit;
1567 di->dqb_curinodes = dm->dqb_curinodes;
1568 di->dqb_btime = dm->dqb_btime;
1569 di->dqb_itime = dm->dqb_itime;
1570 di->dqb_valid = QIF_ALL;
1571 spin_unlock(&dq_data_lock);
1574 int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
1576 struct dquot *dquot;
1578 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
1579 if (!(dquot = dqget(sb, id, type))) {
1580 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
1581 return -ESRCH;
1583 do_get_dqblk(dquot, di);
1584 dqput(dquot);
1585 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
1586 return 0;
1589 /* Generic routine for setting common part of quota structure */
1590 static void do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
1592 struct mem_dqblk *dm = &dquot->dq_dqb;
1593 int check_blim = 0, check_ilim = 0;
1595 spin_lock(&dq_data_lock);
1596 if (di->dqb_valid & QIF_SPACE) {
1597 dm->dqb_curspace = di->dqb_curspace;
1598 check_blim = 1;
1600 if (di->dqb_valid & QIF_BLIMITS) {
1601 dm->dqb_bsoftlimit = di->dqb_bsoftlimit;
1602 dm->dqb_bhardlimit = di->dqb_bhardlimit;
1603 check_blim = 1;
1605 if (di->dqb_valid & QIF_INODES) {
1606 dm->dqb_curinodes = di->dqb_curinodes;
1607 check_ilim = 1;
1609 if (di->dqb_valid & QIF_ILIMITS) {
1610 dm->dqb_isoftlimit = di->dqb_isoftlimit;
1611 dm->dqb_ihardlimit = di->dqb_ihardlimit;
1612 check_ilim = 1;
1614 if (di->dqb_valid & QIF_BTIME)
1615 dm->dqb_btime = di->dqb_btime;
1616 if (di->dqb_valid & QIF_ITIME)
1617 dm->dqb_itime = di->dqb_itime;
1619 if (check_blim) {
1620 if (!dm->dqb_bsoftlimit || toqb(dm->dqb_curspace) < dm->dqb_bsoftlimit) {
1621 dm->dqb_btime = 0;
1622 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
1624 else if (!(di->dqb_valid & QIF_BTIME)) /* Set grace only if user hasn't provided his own... */
1625 dm->dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace;
1627 if (check_ilim) {
1628 if (!dm->dqb_isoftlimit || dm->dqb_curinodes < dm->dqb_isoftlimit) {
1629 dm->dqb_itime = 0;
1630 clear_bit(DQ_INODES_B, &dquot->dq_flags);
1632 else if (!(di->dqb_valid & QIF_ITIME)) /* Set grace only if user hasn't provided his own... */
1633 dm->dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
1635 if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || dm->dqb_isoftlimit)
1636 clear_bit(DQ_FAKE_B, &dquot->dq_flags);
1637 else
1638 set_bit(DQ_FAKE_B, &dquot->dq_flags);
1639 spin_unlock(&dq_data_lock);
1640 mark_dquot_dirty(dquot);
1643 int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
1645 struct dquot *dquot;
1647 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
1648 if (!(dquot = dqget(sb, id, type))) {
1649 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
1650 return -ESRCH;
1652 do_set_dqblk(dquot, di);
1653 dqput(dquot);
1654 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
1655 return 0;
1658 /* Generic routine for getting common part of quota file information */
1659 int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
1661 struct mem_dqinfo *mi;
1663 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
1664 if (!sb_has_quota_enabled(sb, type)) {
1665 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
1666 return -ESRCH;
1668 mi = sb_dqopt(sb)->info + type;
1669 spin_lock(&dq_data_lock);
1670 ii->dqi_bgrace = mi->dqi_bgrace;
1671 ii->dqi_igrace = mi->dqi_igrace;
1672 ii->dqi_flags = mi->dqi_flags & DQF_MASK;
1673 ii->dqi_valid = IIF_ALL;
1674 spin_unlock(&dq_data_lock);
1675 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
1676 return 0;
1679 /* Generic routine for setting common part of quota file information */
1680 int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
1682 struct mem_dqinfo *mi;
1684 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
1685 if (!sb_has_quota_enabled(sb, type)) {
1686 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
1687 return -ESRCH;
1689 mi = sb_dqopt(sb)->info + type;
1690 spin_lock(&dq_data_lock);
1691 if (ii->dqi_valid & IIF_BGRACE)
1692 mi->dqi_bgrace = ii->dqi_bgrace;
1693 if (ii->dqi_valid & IIF_IGRACE)
1694 mi->dqi_igrace = ii->dqi_igrace;
1695 if (ii->dqi_valid & IIF_FLAGS)
1696 mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | (ii->dqi_flags & DQF_MASK);
1697 spin_unlock(&dq_data_lock);
1698 mark_info_dirty(sb, type);
1699 /* Force write to disk */
1700 sb->dq_op->write_info(sb, type);
1701 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
1702 return 0;
1705 struct quotactl_ops vfs_quotactl_ops = {
1706 .quota_on = vfs_quota_on,
1707 .quota_off = vfs_quota_off,
1708 .quota_sync = vfs_quota_sync,
1709 .get_info = vfs_get_dqinfo,
1710 .set_info = vfs_set_dqinfo,
1711 .get_dqblk = vfs_get_dqblk,
1712 .set_dqblk = vfs_set_dqblk
1713 };
1715 static ctl_table fs_dqstats_table[] = {
1717 .ctl_name = FS_DQ_LOOKUPS,
1718 .procname = "lookups",
1719 .data = &dqstats.lookups,
1720 .maxlen = sizeof(int),
1721 .mode = 0444,
1722 .proc_handler = &proc_dointvec,
1723 },
1725 .ctl_name = FS_DQ_DROPS,
1726 .procname = "drops",
1727 .data = &dqstats.drops,
1728 .maxlen = sizeof(int),
1729 .mode = 0444,
1730 .proc_handler = &proc_dointvec,
1731 },
1733 .ctl_name = FS_DQ_READS,
1734 .procname = "reads",
1735 .data = &dqstats.reads,
1736 .maxlen = sizeof(int),
1737 .mode = 0444,
1738 .proc_handler = &proc_dointvec,
1739 },
1741 .ctl_name = FS_DQ_WRITES,
1742 .procname = "writes",
1743 .data = &dqstats.writes,
1744 .maxlen = sizeof(int),
1745 .mode = 0444,
1746 .proc_handler = &proc_dointvec,
1747 },
1749 .ctl_name = FS_DQ_CACHE_HITS,
1750 .procname = "cache_hits",
1751 .data = &dqstats.cache_hits,
1752 .maxlen = sizeof(int),
1753 .mode = 0444,
1754 .proc_handler = &proc_dointvec,
1755 },
1757 .ctl_name = FS_DQ_ALLOCATED,
1758 .procname = "allocated_dquots",
1759 .data = &dqstats.allocated_dquots,
1760 .maxlen = sizeof(int),
1761 .mode = 0444,
1762 .proc_handler = &proc_dointvec,
1763 },
1765 .ctl_name = FS_DQ_FREE,
1766 .procname = "free_dquots",
1767 .data = &dqstats.free_dquots,
1768 .maxlen = sizeof(int),
1769 .mode = 0444,
1770 .proc_handler = &proc_dointvec,
1771 },
1773 .ctl_name = FS_DQ_SYNCS,
1774 .procname = "syncs",
1775 .data = &dqstats.syncs,
1776 .maxlen = sizeof(int),
1777 .mode = 0444,
1778 .proc_handler = &proc_dointvec,
1779 },
1781 .ctl_name = FS_DQ_WARNINGS,
1782 .procname = "warnings",
1783 .data = &flag_print_warnings,
1784 .maxlen = sizeof(int),
1785 .mode = 0644,
1786 .proc_handler = &proc_dointvec,
1787 },
1788 { .ctl_name = 0 },
1789 };
1791 static ctl_table fs_table[] = {
1793 .ctl_name = FS_DQSTATS,
1794 .procname = "quota",
1795 .mode = 0555,
1796 .child = fs_dqstats_table,
1797 },
1798 { .ctl_name = 0 },
1799 };
1801 static ctl_table sys_table[] = {
1803 .ctl_name = CTL_FS,
1804 .procname = "fs",
1805 .mode = 0555,
1806 .child = fs_table,
1807 },
1808 { .ctl_name = 0 },
1809 };
1811 static int __init dquot_init(void)
1813 int i;
1814 unsigned long nr_hash, order;
1816 printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
1818 register_sysctl_table(sys_table, 0);
1820 dquot_cachep = kmem_cache_create("dquot",
1821 sizeof(struct dquot), sizeof(unsigned long) * 4,
1822 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1823 SLAB_MEM_SPREAD|SLAB_PANIC),
1824 NULL, NULL);
1826 order = 0;
1827 dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
1828 if (!dquot_hash)
1829 panic("Cannot create dquot hash table");
1831 /* Find power-of-two hlist_heads which can fit into allocation */
1832 nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
1833 dq_hash_bits = 0;
1834 do {
1835 dq_hash_bits++;
1836 } while (nr_hash >> dq_hash_bits);
1837 dq_hash_bits--;
1839 nr_hash = 1UL << dq_hash_bits;
1840 dq_hash_mask = nr_hash - 1;
1841 for (i = 0; i < nr_hash; i++)
1842 INIT_HLIST_HEAD(dquot_hash + i);
1844 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
1845 nr_hash, order, (PAGE_SIZE << order));
1847 set_shrinker(DEFAULT_SEEKS, shrink_dqcache_memory);
1849 return 0;
1851 module_init(dquot_init);
1853 EXPORT_SYMBOL(register_quota_format);
1854 EXPORT_SYMBOL(unregister_quota_format);
1855 EXPORT_SYMBOL(dqstats);
1856 EXPORT_SYMBOL(dq_data_lock);
1857 EXPORT_SYMBOL(vfs_quota_on);
1858 EXPORT_SYMBOL(vfs_quota_on_mount);
1859 EXPORT_SYMBOL(vfs_quota_off);
1860 EXPORT_SYMBOL(vfs_quota_sync);
1861 EXPORT_SYMBOL(vfs_get_dqinfo);
1862 EXPORT_SYMBOL(vfs_set_dqinfo);
1863 EXPORT_SYMBOL(vfs_get_dqblk);
1864 EXPORT_SYMBOL(vfs_set_dqblk);
1865 EXPORT_SYMBOL(dquot_commit);
1866 EXPORT_SYMBOL(dquot_commit_info);
1867 EXPORT_SYMBOL(dquot_acquire);
1868 EXPORT_SYMBOL(dquot_release);
1869 EXPORT_SYMBOL(dquot_mark_dquot_dirty);
1870 EXPORT_SYMBOL(dquot_initialize);
1871 EXPORT_SYMBOL(dquot_drop);
1872 EXPORT_SYMBOL(dquot_alloc_space);
1873 EXPORT_SYMBOL(dquot_alloc_inode);
1874 EXPORT_SYMBOL(dquot_free_space);
1875 EXPORT_SYMBOL(dquot_free_inode);
1876 EXPORT_SYMBOL(dquot_transfer);