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.
12 * Author: Marco van Wieringen <mvw@planets.elm.net>
14 * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
16 * Revised list management to avoid races
17 * -- Bill Hawes, <whawes@star.net>, 9/98
19 * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
20 * As the consequence the locking was moved from dquot_decr_...(),
21 * dquot_incr_...() to calling functions.
22 * invalidate_dquots() now writes modified dquots.
23 * Serialized quota_off() and quota_on() for mount point.
24 * Fixed a few bugs in grow_dquots().
25 * Fixed deadlock in write_dquot() - we no longer account quotas on
27 * remove_dquot_ref() moved to inode.c - it now traverses through inodes
28 * add_dquot_ref() restarts after blocking
29 * Added check for bogus uid and fixed check for group in quotactl.
30 * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
32 * Used struct list_head instead of own list struct
33 * Invalidation of referenced dquots is no longer possible
34 * Improved free_dquots list management
35 * Quota and i_blocks are now updated in one place to avoid races
36 * Warnings are now delayed so we won't block in critical section
37 * Write updated not to require dquot lock
38 * Jan Kara, <jack@suse.cz>, 9/2000
40 * Added dynamic quota structure allocation
41 * Jan Kara <jack@suse.cz> 12/2000
43 * Rewritten quota interface. Implemented new quota format and
44 * formats registering.
45 * Jan Kara, <jack@suse.cz>, 2001,2002
48 * Jan Kara, <jack@suse.cz>, 10/2002
50 * Added journalled quota support, fix lock inversion problems
51 * Jan Kara, <jack@suse.cz>, 2003,2004
53 * (C) Copyright 1994 - 1997 Marco van Wieringen
56 #include <linux/errno.h>
57 #include <linux/kernel.h>
59 #include <linux/mount.h>
61 #include <linux/time.h>
62 #include <linux/types.h>
63 #include <linux/string.h>
64 #include <linux/fcntl.h>
65 #include <linux/stat.h>
66 #include <linux/tty.h>
67 #include <linux/file.h>
68 #include <linux/slab.h>
69 #include <linux/sysctl.h>
70 #include <linux/init.h>
71 #include <linux/module.h>
72 #include <linux/proc_fs.h>
73 #include <linux/security.h>
74 #include <linux/kmod.h>
75 #include <linux/namei.h>
76 #include <linux/buffer_head.h>
77 #include <linux/capability.h>
78 #include <linux/quotaops.h>
79 #include "../internal.h" /* ugh */
81 #include <asm/uaccess.h>
84 * There are three quota SMP locks. dq_list_lock protects all lists with quotas
86 * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
87 * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
88 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
89 * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
90 * modifications of quota state (on quotaon and quotaoff) and readers who care
91 * about latest values take it as well.
93 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
94 * dq_list_lock > dq_state_lock
96 * Note that some things (eg. sb pointer, type, id) doesn't change during
97 * the life of the dquot structure and so needn't to be protected by a lock
99 * Any operation working on dquots via inode pointers must hold dqptr_sem. If
100 * operation is just reading pointers from inode (or not using them at all) the
101 * read lock is enough. If pointers are altered function must hold write lock.
102 * Special care needs to be taken about S_NOQUOTA inode flag (marking that
103 * inode is a quota file). Functions adding pointers from inode to dquots have
104 * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they
105 * have to do all pointer modifications before dropping dqptr_sem. This makes
106 * sure they cannot race with quotaon which first sets S_NOQUOTA flag and
107 * then drops all pointers to dquots from an inode.
109 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
110 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
111 * Currently dquot is locked only when it is being read to memory (or space for
112 * it is being allocated) on the first dqget() and when it is being released on
113 * the last dqput(). The allocation and release oparations are serialized by
114 * the dq_lock and by checking the use count in dquot_release(). Write
115 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
116 * spinlock to internal buffers before writing.
118 * Lock ordering (including related VFS locks) is the following:
119 * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
121 * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
122 * dqptr_sem. But filesystem has to count with the fact that functions such as
123 * dquot_alloc_space() acquire dqptr_sem and they usually have to be called
124 * from inside a transaction to keep filesystem consistency after a crash. Also
125 * filesystems usually want to do some IO on dquot from ->mark_dirty which is
126 * called with dqptr_sem held.
127 * i_mutex on quota files is special (it's below dqio_mutex)
130 static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock);
131 static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock);
132 __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock);
133 EXPORT_SYMBOL(dq_data_lock);
135 void __quota_error(struct super_block *sb, const char *func,
136 const char *fmt, ...)
138 if (printk_ratelimit()) {
140 struct va_format vaf;
147 printk(KERN_ERR "Quota error (device %s): %s: %pV\n",
148 sb->s_id, func, &vaf);
153 EXPORT_SYMBOL(__quota_error);
155 #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING)
156 static char *quotatypes[] = INITQFNAMES;
158 static struct quota_format_type *quota_formats; /* List of registered formats */
159 static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES;
161 /* SLAB cache for dquot structures */
162 static struct kmem_cache *dquot_cachep;
164 int register_quota_format(struct quota_format_type *fmt)
166 spin_lock(&dq_list_lock);
167 fmt->qf_next = quota_formats;
169 spin_unlock(&dq_list_lock);
172 EXPORT_SYMBOL(register_quota_format);
174 void unregister_quota_format(struct quota_format_type *fmt)
176 struct quota_format_type **actqf;
178 spin_lock(&dq_list_lock);
179 for (actqf = "a_formats; *actqf && *actqf != fmt;
180 actqf = &(*actqf)->qf_next)
183 *actqf = (*actqf)->qf_next;
184 spin_unlock(&dq_list_lock);
186 EXPORT_SYMBOL(unregister_quota_format);
188 static struct quota_format_type *find_quota_format(int id)
190 struct quota_format_type *actqf;
192 spin_lock(&dq_list_lock);
193 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id;
194 actqf = actqf->qf_next)
196 if (!actqf || !try_module_get(actqf->qf_owner)) {
199 spin_unlock(&dq_list_lock);
201 for (qm = 0; module_names[qm].qm_fmt_id &&
202 module_names[qm].qm_fmt_id != id; qm++)
204 if (!module_names[qm].qm_fmt_id ||
205 request_module(module_names[qm].qm_mod_name))
208 spin_lock(&dq_list_lock);
209 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id;
210 actqf = actqf->qf_next)
212 if (actqf && !try_module_get(actqf->qf_owner))
215 spin_unlock(&dq_list_lock);
219 static void put_quota_format(struct quota_format_type *fmt)
221 module_put(fmt->qf_owner);
225 * Dquot List Management:
226 * The quota code uses three lists for dquot management: the inuse_list,
227 * free_dquots, and dquot_hash[] array. A single dquot structure may be
228 * on all three lists, depending on its current state.
230 * All dquots are placed to the end of inuse_list when first created, and this
231 * list is used for invalidate operation, which must look at every dquot.
233 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
234 * and this list is searched whenever we need an available dquot. Dquots are
235 * removed from the list as soon as they are used again, and
236 * dqstats.free_dquots gives the number of dquots on the list. When
237 * dquot is invalidated it's completely released from memory.
239 * Dquots with a specific identity (device, type and id) are placed on
240 * one of the dquot_hash[] hash chains. The provides an efficient search
241 * mechanism to locate a specific dquot.
244 static LIST_HEAD(inuse_list);
245 static LIST_HEAD(free_dquots);
246 static unsigned int dq_hash_bits, dq_hash_mask;
247 static struct hlist_head *dquot_hash;
249 struct dqstats dqstats;
250 EXPORT_SYMBOL(dqstats);
252 static qsize_t inode_get_rsv_space(struct inode *inode);
253 static void __dquot_initialize(struct inode *inode, int type);
255 static inline unsigned int
256 hashfn(const struct super_block *sb, unsigned int id, int type)
260 tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
261 return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
265 * Following list functions expect dq_list_lock to be held
267 static inline void insert_dquot_hash(struct dquot *dquot)
269 struct hlist_head *head;
270 head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type);
271 hlist_add_head(&dquot->dq_hash, head);
274 static inline void remove_dquot_hash(struct dquot *dquot)
276 hlist_del_init(&dquot->dq_hash);
279 static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb,
280 unsigned int id, int type)
282 struct hlist_node *node;
285 hlist_for_each (node, dquot_hash+hashent) {
286 dquot = hlist_entry(node, struct dquot, dq_hash);
287 if (dquot->dq_sb == sb && dquot->dq_id == id &&
288 dquot->dq_type == type)
294 /* Add a dquot to the tail of the free list */
295 static inline void put_dquot_last(struct dquot *dquot)
297 list_add_tail(&dquot->dq_free, &free_dquots);
298 dqstats_inc(DQST_FREE_DQUOTS);
301 static inline void remove_free_dquot(struct dquot *dquot)
303 if (list_empty(&dquot->dq_free))
305 list_del_init(&dquot->dq_free);
306 dqstats_dec(DQST_FREE_DQUOTS);
309 static inline void put_inuse(struct dquot *dquot)
311 /* We add to the back of inuse list so we don't have to restart
312 * when traversing this list and we block */
313 list_add_tail(&dquot->dq_inuse, &inuse_list);
314 dqstats_inc(DQST_ALLOC_DQUOTS);
317 static inline void remove_inuse(struct dquot *dquot)
319 dqstats_dec(DQST_ALLOC_DQUOTS);
320 list_del(&dquot->dq_inuse);
323 * End of list functions needing dq_list_lock
326 static void wait_on_dquot(struct dquot *dquot)
328 mutex_lock(&dquot->dq_lock);
329 mutex_unlock(&dquot->dq_lock);
332 static inline int dquot_dirty(struct dquot *dquot)
334 return test_bit(DQ_MOD_B, &dquot->dq_flags);
337 static inline int mark_dquot_dirty(struct dquot *dquot)
339 return dquot->dq_sb->dq_op->mark_dirty(dquot);
342 /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */
343 int dquot_mark_dquot_dirty(struct dquot *dquot)
347 /* If quota is dirty already, we don't have to acquire dq_list_lock */
348 if (test_bit(DQ_MOD_B, &dquot->dq_flags))
351 spin_lock(&dq_list_lock);
352 if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) {
353 list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
354 info[dquot->dq_type].dqi_dirty_list);
357 spin_unlock(&dq_list_lock);
360 EXPORT_SYMBOL(dquot_mark_dquot_dirty);
362 /* Dirtify all the dquots - this can block when journalling */
363 static inline int mark_all_dquot_dirty(struct dquot * const *dquot)
368 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
370 /* Even in case of error we have to continue */
371 ret = mark_dquot_dirty(dquot[cnt]);
378 static inline void dqput_all(struct dquot **dquot)
382 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
386 /* This function needs dq_list_lock */
387 static inline int clear_dquot_dirty(struct dquot *dquot)
389 if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
391 list_del_init(&dquot->dq_dirty);
395 void mark_info_dirty(struct super_block *sb, int type)
397 set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
399 EXPORT_SYMBOL(mark_info_dirty);
402 * Read dquot from disk and alloc space for it
405 int dquot_acquire(struct dquot *dquot)
407 int ret = 0, ret2 = 0;
408 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
410 mutex_lock(&dquot->dq_lock);
411 mutex_lock(&dqopt->dqio_mutex);
412 if (!test_bit(DQ_READ_B, &dquot->dq_flags))
413 ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
416 set_bit(DQ_READ_B, &dquot->dq_flags);
417 /* Instantiate dquot if needed */
418 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
419 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
420 /* Write the info if needed */
421 if (info_dirty(&dqopt->info[dquot->dq_type])) {
422 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(
423 dquot->dq_sb, dquot->dq_type);
432 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
434 mutex_unlock(&dqopt->dqio_mutex);
435 mutex_unlock(&dquot->dq_lock);
438 EXPORT_SYMBOL(dquot_acquire);
441 * Write dquot to disk
443 int dquot_commit(struct dquot *dquot)
446 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
448 mutex_lock(&dqopt->dqio_mutex);
449 spin_lock(&dq_list_lock);
450 if (!clear_dquot_dirty(dquot)) {
451 spin_unlock(&dq_list_lock);
454 spin_unlock(&dq_list_lock);
455 /* Inactive dquot can be only if there was error during read/init
456 * => we have better not writing it */
457 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
458 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
462 mutex_unlock(&dqopt->dqio_mutex);
465 EXPORT_SYMBOL(dquot_commit);
470 int dquot_release(struct dquot *dquot)
472 int ret = 0, ret2 = 0;
473 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
475 mutex_lock(&dquot->dq_lock);
476 /* Check whether we are not racing with some other dqget() */
477 if (atomic_read(&dquot->dq_count) > 1)
479 mutex_lock(&dqopt->dqio_mutex);
480 if (dqopt->ops[dquot->dq_type]->release_dqblk) {
481 ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
483 if (info_dirty(&dqopt->info[dquot->dq_type])) {
484 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(
485 dquot->dq_sb, dquot->dq_type);
490 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
491 mutex_unlock(&dqopt->dqio_mutex);
493 mutex_unlock(&dquot->dq_lock);
496 EXPORT_SYMBOL(dquot_release);
498 void dquot_destroy(struct dquot *dquot)
500 kmem_cache_free(dquot_cachep, dquot);
502 EXPORT_SYMBOL(dquot_destroy);
504 static inline void do_destroy_dquot(struct dquot *dquot)
506 dquot->dq_sb->dq_op->destroy_dquot(dquot);
509 /* Invalidate all dquots on the list. Note that this function is called after
510 * quota is disabled and pointers from inodes removed so there cannot be new
511 * quota users. There can still be some users of quotas due to inodes being
512 * just deleted or pruned by prune_icache() (those are not attached to any
513 * list) or parallel quotactl call. We have to wait for such users.
515 static void invalidate_dquots(struct super_block *sb, int type)
517 struct dquot *dquot, *tmp;
520 spin_lock(&dq_list_lock);
521 list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
522 if (dquot->dq_sb != sb)
524 if (dquot->dq_type != type)
526 /* Wait for dquot users */
527 if (atomic_read(&dquot->dq_count)) {
530 atomic_inc(&dquot->dq_count);
531 prepare_to_wait(&dquot->dq_wait_unused, &wait,
532 TASK_UNINTERRUPTIBLE);
533 spin_unlock(&dq_list_lock);
534 /* Once dqput() wakes us up, we know it's time to free
536 * IMPORTANT: we rely on the fact that there is always
537 * at most one process waiting for dquot to free.
538 * Otherwise dq_count would be > 1 and we would never
541 if (atomic_read(&dquot->dq_count) > 1)
543 finish_wait(&dquot->dq_wait_unused, &wait);
545 /* At this moment dquot() need not exist (it could be
546 * reclaimed by prune_dqcache(). Hence we must
551 * Quota now has no users and it has been written on last
554 remove_dquot_hash(dquot);
555 remove_free_dquot(dquot);
557 do_destroy_dquot(dquot);
559 spin_unlock(&dq_list_lock);
562 /* Call callback for every active dquot on given filesystem */
563 int dquot_scan_active(struct super_block *sb,
564 int (*fn)(struct dquot *dquot, unsigned long priv),
567 struct dquot *dquot, *old_dquot = NULL;
570 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
571 spin_lock(&dq_list_lock);
572 list_for_each_entry(dquot, &inuse_list, dq_inuse) {
573 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
575 if (dquot->dq_sb != sb)
577 /* Now we have active dquot so we can just increase use count */
578 atomic_inc(&dquot->dq_count);
579 spin_unlock(&dq_list_lock);
580 dqstats_inc(DQST_LOOKUPS);
584 * ->release_dquot() can be racing with us. Our reference
585 * protects us from new calls to it so just wait for any
586 * outstanding call and recheck the DQ_ACTIVE_B after that.
588 wait_on_dquot(dquot);
589 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
590 ret = fn(dquot, priv);
594 spin_lock(&dq_list_lock);
595 /* We are safe to continue now because our dquot could not
596 * be moved out of the inuse list while we hold the reference */
598 spin_unlock(&dq_list_lock);
601 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
604 EXPORT_SYMBOL(dquot_scan_active);
606 int dquot_quota_sync(struct super_block *sb, int type, int wait)
608 struct list_head *dirty;
610 struct quota_info *dqopt = sb_dqopt(sb);
613 mutex_lock(&dqopt->dqonoff_mutex);
614 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
615 if (type != -1 && cnt != type)
617 if (!sb_has_quota_active(sb, cnt))
619 spin_lock(&dq_list_lock);
620 dirty = &dqopt->info[cnt].dqi_dirty_list;
621 while (!list_empty(dirty)) {
622 dquot = list_first_entry(dirty, struct dquot,
624 /* Dirty and inactive can be only bad dquot... */
625 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
626 clear_dquot_dirty(dquot);
629 /* Now we have active dquot from which someone is
630 * holding reference so we can safely just increase
632 atomic_inc(&dquot->dq_count);
633 spin_unlock(&dq_list_lock);
634 dqstats_inc(DQST_LOOKUPS);
635 sb->dq_op->write_dquot(dquot);
637 spin_lock(&dq_list_lock);
639 spin_unlock(&dq_list_lock);
642 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
643 if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt)
644 && info_dirty(&dqopt->info[cnt]))
645 sb->dq_op->write_info(sb, cnt);
646 dqstats_inc(DQST_SYNCS);
647 mutex_unlock(&dqopt->dqonoff_mutex);
649 if (!wait || (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE))
652 /* This is not very clever (and fast) but currently I don't know about
653 * any other simple way of getting quota data to disk and we must get
654 * them there for userspace to be visible... */
655 if (sb->s_op->sync_fs)
656 sb->s_op->sync_fs(sb, 1);
657 sync_blockdev(sb->s_bdev);
660 * Now when everything is written we can discard the pagecache so
661 * that userspace sees the changes.
663 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
664 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
665 if (type != -1 && cnt != type)
667 if (!sb_has_quota_active(sb, cnt))
669 mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex,
671 truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0);
672 mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex);
674 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
678 EXPORT_SYMBOL(dquot_quota_sync);
680 /* Free unused dquots from cache */
681 static void prune_dqcache(int count)
683 struct list_head *head;
686 head = free_dquots.prev;
687 while (head != &free_dquots && count) {
688 dquot = list_entry(head, struct dquot, dq_free);
689 remove_dquot_hash(dquot);
690 remove_free_dquot(dquot);
692 do_destroy_dquot(dquot);
694 head = free_dquots.prev;
699 * This is called from kswapd when we think we need some
702 static int shrink_dqcache_memory(struct shrinker *shrink,
703 struct shrink_control *sc)
705 int nr = sc->nr_to_scan;
708 spin_lock(&dq_list_lock);
710 spin_unlock(&dq_list_lock);
713 percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])
714 /100) * sysctl_vfs_cache_pressure;
717 static struct shrinker dqcache_shrinker = {
718 .shrink = shrink_dqcache_memory,
719 .seeks = DEFAULT_SEEKS,
723 * Put reference to dquot
724 * NOTE: If you change this function please check whether dqput_blocks() works right...
726 void dqput(struct dquot *dquot)
732 #ifdef CONFIG_QUOTA_DEBUG
733 if (!atomic_read(&dquot->dq_count)) {
734 quota_error(dquot->dq_sb, "trying to free free dquot of %s %d",
735 quotatypes[dquot->dq_type], dquot->dq_id);
739 dqstats_inc(DQST_DROPS);
741 spin_lock(&dq_list_lock);
742 if (atomic_read(&dquot->dq_count) > 1) {
743 /* We have more than one user... nothing to do */
744 atomic_dec(&dquot->dq_count);
745 /* Releasing dquot during quotaoff phase? */
746 if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) &&
747 atomic_read(&dquot->dq_count) == 1)
748 wake_up(&dquot->dq_wait_unused);
749 spin_unlock(&dq_list_lock);
752 /* Need to release dquot? */
753 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
754 spin_unlock(&dq_list_lock);
755 /* Commit dquot before releasing */
756 ret = dquot->dq_sb->dq_op->write_dquot(dquot);
758 quota_error(dquot->dq_sb, "Can't write quota structure"
759 " (error %d). Quota may get out of sync!",
762 * We clear dirty bit anyway, so that we avoid
765 spin_lock(&dq_list_lock);
766 clear_dquot_dirty(dquot);
767 spin_unlock(&dq_list_lock);
771 /* Clear flag in case dquot was inactive (something bad happened) */
772 clear_dquot_dirty(dquot);
773 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
774 spin_unlock(&dq_list_lock);
775 dquot->dq_sb->dq_op->release_dquot(dquot);
778 atomic_dec(&dquot->dq_count);
779 #ifdef CONFIG_QUOTA_DEBUG
781 BUG_ON(!list_empty(&dquot->dq_free));
783 put_dquot_last(dquot);
784 spin_unlock(&dq_list_lock);
786 EXPORT_SYMBOL(dqput);
788 struct dquot *dquot_alloc(struct super_block *sb, int type)
790 return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
792 EXPORT_SYMBOL(dquot_alloc);
794 static struct dquot *get_empty_dquot(struct super_block *sb, int type)
798 dquot = sb->dq_op->alloc_dquot(sb, type);
802 mutex_init(&dquot->dq_lock);
803 INIT_LIST_HEAD(&dquot->dq_free);
804 INIT_LIST_HEAD(&dquot->dq_inuse);
805 INIT_HLIST_NODE(&dquot->dq_hash);
806 INIT_LIST_HEAD(&dquot->dq_dirty);
807 init_waitqueue_head(&dquot->dq_wait_unused);
809 dquot->dq_type = type;
810 atomic_set(&dquot->dq_count, 1);
816 * Get reference to dquot
818 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
819 * destroying our dquot by:
820 * a) checking for quota flags under dq_list_lock and
821 * b) getting a reference to dquot before we release dq_list_lock
823 struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
825 unsigned int hashent = hashfn(sb, id, type);
826 struct dquot *dquot = NULL, *empty = NULL;
828 if (!sb_has_quota_active(sb, type))
831 spin_lock(&dq_list_lock);
832 spin_lock(&dq_state_lock);
833 if (!sb_has_quota_active(sb, type)) {
834 spin_unlock(&dq_state_lock);
835 spin_unlock(&dq_list_lock);
838 spin_unlock(&dq_state_lock);
840 dquot = find_dquot(hashent, sb, id, type);
843 spin_unlock(&dq_list_lock);
844 empty = get_empty_dquot(sb, type);
846 schedule(); /* Try to wait for a moment... */
852 /* all dquots go on the inuse_list */
854 /* hash it first so it can be found */
855 insert_dquot_hash(dquot);
856 spin_unlock(&dq_list_lock);
857 dqstats_inc(DQST_LOOKUPS);
859 if (!atomic_read(&dquot->dq_count))
860 remove_free_dquot(dquot);
861 atomic_inc(&dquot->dq_count);
862 spin_unlock(&dq_list_lock);
863 dqstats_inc(DQST_CACHE_HITS);
864 dqstats_inc(DQST_LOOKUPS);
866 /* Wait for dq_lock - after this we know that either dquot_release() is
867 * already finished or it will be canceled due to dq_count > 1 test */
868 wait_on_dquot(dquot);
869 /* Read the dquot / allocate space in quota file */
870 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) &&
871 sb->dq_op->acquire_dquot(dquot) < 0) {
876 #ifdef CONFIG_QUOTA_DEBUG
877 BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
881 do_destroy_dquot(empty);
885 EXPORT_SYMBOL(dqget);
887 static int dqinit_needed(struct inode *inode, int type)
891 if (IS_NOQUOTA(inode))
894 return !inode->i_dquot[type];
895 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
896 if (!inode->i_dquot[cnt])
901 /* This routine is guarded by dqonoff_mutex mutex */
902 static void add_dquot_ref(struct super_block *sb, int type)
904 struct inode *inode, *old_inode = NULL;
905 #ifdef CONFIG_QUOTA_DEBUG
909 spin_lock(&inode_sb_list_lock);
910 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
911 spin_lock(&inode->i_lock);
912 if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
913 !atomic_read(&inode->i_writecount) ||
914 !dqinit_needed(inode, type)) {
915 spin_unlock(&inode->i_lock);
918 #ifdef CONFIG_QUOTA_DEBUG
919 if (unlikely(inode_get_rsv_space(inode) > 0))
923 spin_unlock(&inode->i_lock);
924 spin_unlock(&inode_sb_list_lock);
927 __dquot_initialize(inode, type);
930 * We hold a reference to 'inode' so it couldn't have been
931 * removed from s_inodes list while we dropped the
932 * inode_sb_list_lock We cannot iput the inode now as we can be
933 * holding the last reference and we cannot iput it under
934 * inode_sb_list_lock. So we keep the reference and iput it
938 spin_lock(&inode_sb_list_lock);
940 spin_unlock(&inode_sb_list_lock);
943 #ifdef CONFIG_QUOTA_DEBUG
945 quota_error(sb, "Writes happened before quota was turned on "
946 "thus quota information is probably inconsistent. "
947 "Please run quotacheck(8)");
953 * Return 0 if dqput() won't block.
954 * (note that 1 doesn't necessarily mean blocking)
956 static inline int dqput_blocks(struct dquot *dquot)
958 if (atomic_read(&dquot->dq_count) <= 1)
964 * Remove references to dquots from inode and add dquot to list for freeing
965 * if we have the last reference to dquot
966 * We can't race with anybody because we hold dqptr_sem for writing...
968 static int remove_inode_dquot_ref(struct inode *inode, int type,
969 struct list_head *tofree_head)
971 struct dquot *dquot = inode->i_dquot[type];
973 inode->i_dquot[type] = NULL;
975 if (dqput_blocks(dquot)) {
976 #ifdef CONFIG_QUOTA_DEBUG
977 if (atomic_read(&dquot->dq_count) != 1)
978 quota_error(inode->i_sb, "Adding dquot with "
979 "dq_count %d to dispose list",
980 atomic_read(&dquot->dq_count));
982 spin_lock(&dq_list_lock);
983 /* As dquot must have currently users it can't be on
984 * the free list... */
985 list_add(&dquot->dq_free, tofree_head);
986 spin_unlock(&dq_list_lock);
990 dqput(dquot); /* We have guaranteed we won't block */
996 * Free list of dquots
997 * Dquots are removed from inodes and no new references can be got so we are
998 * the only ones holding reference
1000 static void put_dquot_list(struct list_head *tofree_head)
1002 struct list_head *act_head;
1003 struct dquot *dquot;
1005 act_head = tofree_head->next;
1006 while (act_head != tofree_head) {
1007 dquot = list_entry(act_head, struct dquot, dq_free);
1008 act_head = act_head->next;
1009 /* Remove dquot from the list so we won't have problems... */
1010 list_del_init(&dquot->dq_free);
1015 static void remove_dquot_ref(struct super_block *sb, int type,
1016 struct list_head *tofree_head)
1018 struct inode *inode;
1021 spin_lock(&inode_sb_list_lock);
1022 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
1024 * We have to scan also I_NEW inodes because they can already
1025 * have quota pointer initialized. Luckily, we need to touch
1026 * only quota pointers and these have separate locking
1029 if (!IS_NOQUOTA(inode)) {
1030 if (unlikely(inode_get_rsv_space(inode) > 0))
1032 remove_inode_dquot_ref(inode, type, tofree_head);
1035 spin_unlock(&inode_sb_list_lock);
1036 #ifdef CONFIG_QUOTA_DEBUG
1038 printk(KERN_WARNING "VFS (%s): Writes happened after quota"
1039 " was disabled thus quota information is probably "
1040 "inconsistent. Please run quotacheck(8).\n", sb->s_id);
1045 /* Gather all references from inodes and drop them */
1046 static void drop_dquot_ref(struct super_block *sb, int type)
1048 LIST_HEAD(tofree_head);
1051 down_write(&sb_dqopt(sb)->dqptr_sem);
1052 remove_dquot_ref(sb, type, &tofree_head);
1053 up_write(&sb_dqopt(sb)->dqptr_sem);
1054 put_dquot_list(&tofree_head);
1058 static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
1060 dquot->dq_dqb.dqb_curinodes += number;
1063 static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
1065 dquot->dq_dqb.dqb_curspace += number;
1068 static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
1070 dquot->dq_dqb.dqb_rsvspace += number;
1074 * Claim reserved quota space
1076 static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number)
1078 if (dquot->dq_dqb.dqb_rsvspace < number) {
1080 number = dquot->dq_dqb.dqb_rsvspace;
1082 dquot->dq_dqb.dqb_curspace += number;
1083 dquot->dq_dqb.dqb_rsvspace -= number;
1087 void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
1089 if (dquot->dq_dqb.dqb_rsvspace >= number)
1090 dquot->dq_dqb.dqb_rsvspace -= number;
1093 dquot->dq_dqb.dqb_rsvspace = 0;
1097 static void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
1099 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
1100 dquot->dq_dqb.dqb_curinodes >= number)
1101 dquot->dq_dqb.dqb_curinodes -= number;
1103 dquot->dq_dqb.dqb_curinodes = 0;
1104 if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
1105 dquot->dq_dqb.dqb_itime = (time_t) 0;
1106 clear_bit(DQ_INODES_B, &dquot->dq_flags);
1109 static void dquot_decr_space(struct dquot *dquot, qsize_t number)
1111 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
1112 dquot->dq_dqb.dqb_curspace >= number)
1113 dquot->dq_dqb.dqb_curspace -= number;
1115 dquot->dq_dqb.dqb_curspace = 0;
1116 if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
1117 dquot->dq_dqb.dqb_btime = (time_t) 0;
1118 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
1121 static int warning_issued(struct dquot *dquot, const int warntype)
1123 int flag = (warntype == QUOTA_NL_BHARDWARN ||
1124 warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
1125 ((warntype == QUOTA_NL_IHARDWARN ||
1126 warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
1130 return test_and_set_bit(flag, &dquot->dq_flags);
1133 #ifdef CONFIG_PRINT_QUOTA_WARNING
1134 static int flag_print_warnings = 1;
1136 static int need_print_warning(struct dquot *dquot)
1138 if (!flag_print_warnings)
1141 switch (dquot->dq_type) {
1143 return current_fsuid() == dquot->dq_id;
1145 return in_group_p(dquot->dq_id);
1150 /* Print warning to user which exceeded quota */
1151 static void print_warning(struct dquot *dquot, const int warntype)
1154 struct tty_struct *tty;
1156 if (warntype == QUOTA_NL_IHARDBELOW ||
1157 warntype == QUOTA_NL_ISOFTBELOW ||
1158 warntype == QUOTA_NL_BHARDBELOW ||
1159 warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot))
1162 tty = get_current_tty();
1165 tty_write_message(tty, dquot->dq_sb->s_id);
1166 if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
1167 tty_write_message(tty, ": warning, ");
1169 tty_write_message(tty, ": write failed, ");
1170 tty_write_message(tty, quotatypes[dquot->dq_type]);
1172 case QUOTA_NL_IHARDWARN:
1173 msg = " file limit reached.\r\n";
1175 case QUOTA_NL_ISOFTLONGWARN:
1176 msg = " file quota exceeded too long.\r\n";
1178 case QUOTA_NL_ISOFTWARN:
1179 msg = " file quota exceeded.\r\n";
1181 case QUOTA_NL_BHARDWARN:
1182 msg = " block limit reached.\r\n";
1184 case QUOTA_NL_BSOFTLONGWARN:
1185 msg = " block quota exceeded too long.\r\n";
1187 case QUOTA_NL_BSOFTWARN:
1188 msg = " block quota exceeded.\r\n";
1191 tty_write_message(tty, msg);
1197 * Write warnings to the console and send warning messages over netlink.
1199 * Note that this function can sleep.
1201 static void flush_warnings(struct dquot *const *dquots, char *warntype)
1206 for (i = 0; i < MAXQUOTAS; i++) {
1208 if (dq && warntype[i] != QUOTA_NL_NOWARN &&
1209 !warning_issued(dq, warntype[i])) {
1210 #ifdef CONFIG_PRINT_QUOTA_WARNING
1211 print_warning(dq, warntype[i]);
1213 quota_send_warning(dq->dq_type, dq->dq_id,
1214 dq->dq_sb->s_dev, warntype[i]);
1219 static int ignore_hardlimit(struct dquot *dquot)
1221 struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
1223 return capable(CAP_SYS_RESOURCE) &&
1224 (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD ||
1225 !(info->dqi_flags & V1_DQF_RSQUASH));
1228 /* needs dq_data_lock */
1229 static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype)
1231 qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes;
1233 *warntype = QUOTA_NL_NOWARN;
1234 if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
1235 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1238 if (dquot->dq_dqb.dqb_ihardlimit &&
1239 newinodes > dquot->dq_dqb.dqb_ihardlimit &&
1240 !ignore_hardlimit(dquot)) {
1241 *warntype = QUOTA_NL_IHARDWARN;
1245 if (dquot->dq_dqb.dqb_isoftlimit &&
1246 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1247 dquot->dq_dqb.dqb_itime &&
1248 get_seconds() >= dquot->dq_dqb.dqb_itime &&
1249 !ignore_hardlimit(dquot)) {
1250 *warntype = QUOTA_NL_ISOFTLONGWARN;
1254 if (dquot->dq_dqb.dqb_isoftlimit &&
1255 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1256 dquot->dq_dqb.dqb_itime == 0) {
1257 *warntype = QUOTA_NL_ISOFTWARN;
1258 dquot->dq_dqb.dqb_itime = get_seconds() +
1259 sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
1265 /* needs dq_data_lock */
1266 static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype)
1269 struct super_block *sb = dquot->dq_sb;
1271 *warntype = QUOTA_NL_NOWARN;
1272 if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) ||
1273 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1276 tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace
1279 if (dquot->dq_dqb.dqb_bhardlimit &&
1280 tspace > dquot->dq_dqb.dqb_bhardlimit &&
1281 !ignore_hardlimit(dquot)) {
1283 *warntype = QUOTA_NL_BHARDWARN;
1287 if (dquot->dq_dqb.dqb_bsoftlimit &&
1288 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
1289 dquot->dq_dqb.dqb_btime &&
1290 get_seconds() >= dquot->dq_dqb.dqb_btime &&
1291 !ignore_hardlimit(dquot)) {
1293 *warntype = QUOTA_NL_BSOFTLONGWARN;
1297 if (dquot->dq_dqb.dqb_bsoftlimit &&
1298 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
1299 dquot->dq_dqb.dqb_btime == 0) {
1301 *warntype = QUOTA_NL_BSOFTWARN;
1302 dquot->dq_dqb.dqb_btime = get_seconds() +
1303 sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace;
1307 * We don't allow preallocation to exceed softlimit so exceeding will
1316 static int info_idq_free(struct dquot *dquot, qsize_t inodes)
1320 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1321 dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit ||
1322 !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type))
1323 return QUOTA_NL_NOWARN;
1325 newinodes = dquot->dq_dqb.dqb_curinodes - inodes;
1326 if (newinodes <= dquot->dq_dqb.dqb_isoftlimit)
1327 return QUOTA_NL_ISOFTBELOW;
1328 if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
1329 newinodes < dquot->dq_dqb.dqb_ihardlimit)
1330 return QUOTA_NL_IHARDBELOW;
1331 return QUOTA_NL_NOWARN;
1334 static int info_bdq_free(struct dquot *dquot, qsize_t space)
1336 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1337 dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
1338 return QUOTA_NL_NOWARN;
1340 if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit)
1341 return QUOTA_NL_BSOFTBELOW;
1342 if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit &&
1343 dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit)
1344 return QUOTA_NL_BHARDBELOW;
1345 return QUOTA_NL_NOWARN;
1348 static int dquot_active(const struct inode *inode)
1350 struct super_block *sb = inode->i_sb;
1352 if (IS_NOQUOTA(inode))
1354 return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb);
1358 * Initialize quota pointers in inode
1360 * We do things in a bit complicated way but by that we avoid calling
1361 * dqget() and thus filesystem callbacks under dqptr_sem.
1363 * It is better to call this function outside of any transaction as it
1364 * might need a lot of space in journal for dquot structure allocation.
1366 static void __dquot_initialize(struct inode *inode, int type)
1368 unsigned int id = 0;
1370 struct dquot *got[MAXQUOTAS];
1371 struct super_block *sb = inode->i_sb;
1374 /* First test before acquiring mutex - solves deadlocks when we
1375 * re-enter the quota code and are already holding the mutex */
1376 if (!dquot_active(inode))
1379 /* First get references to structures we might need. */
1380 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1382 if (type != -1 && cnt != type)
1392 got[cnt] = dqget(sb, id, cnt);
1395 down_write(&sb_dqopt(sb)->dqptr_sem);
1396 if (IS_NOQUOTA(inode))
1398 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1399 if (type != -1 && cnt != type)
1401 /* Avoid races with quotaoff() */
1402 if (!sb_has_quota_active(sb, cnt))
1404 /* We could race with quotaon or dqget() could have failed */
1407 if (!inode->i_dquot[cnt]) {
1408 inode->i_dquot[cnt] = got[cnt];
1411 * Make quota reservation system happy if someone
1412 * did a write before quota was turned on
1414 rsv = inode_get_rsv_space(inode);
1416 dquot_resv_space(inode->i_dquot[cnt], rsv);
1420 up_write(&sb_dqopt(sb)->dqptr_sem);
1421 /* Drop unused references */
1425 void dquot_initialize(struct inode *inode)
1427 __dquot_initialize(inode, -1);
1429 EXPORT_SYMBOL(dquot_initialize);
1432 * Release all quotas referenced by inode
1434 static void __dquot_drop(struct inode *inode)
1437 struct dquot *put[MAXQUOTAS];
1439 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1440 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1441 put[cnt] = inode->i_dquot[cnt];
1442 inode->i_dquot[cnt] = NULL;
1444 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1448 void dquot_drop(struct inode *inode)
1452 if (IS_NOQUOTA(inode))
1456 * Test before calling to rule out calls from proc and such
1457 * where we are not allowed to block. Note that this is
1458 * actually reliable test even without the lock - the caller
1459 * must assure that nobody can come after the DQUOT_DROP and
1460 * add quota pointers back anyway.
1462 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1463 if (inode->i_dquot[cnt])
1467 if (cnt < MAXQUOTAS)
1468 __dquot_drop(inode);
1470 EXPORT_SYMBOL(dquot_drop);
1473 * inode_reserved_space is managed internally by quota, and protected by
1474 * i_lock similar to i_blocks+i_bytes.
1476 static qsize_t *inode_reserved_space(struct inode * inode)
1478 /* Filesystem must explicitly define it's own method in order to use
1479 * quota reservation interface */
1480 BUG_ON(!inode->i_sb->dq_op->get_reserved_space);
1481 return inode->i_sb->dq_op->get_reserved_space(inode);
1484 void inode_add_rsv_space(struct inode *inode, qsize_t number)
1486 spin_lock(&inode->i_lock);
1487 *inode_reserved_space(inode) += number;
1488 spin_unlock(&inode->i_lock);
1490 EXPORT_SYMBOL(inode_add_rsv_space);
1492 void inode_claim_rsv_space(struct inode *inode, qsize_t number)
1494 spin_lock(&inode->i_lock);
1495 *inode_reserved_space(inode) -= number;
1496 __inode_add_bytes(inode, number);
1497 spin_unlock(&inode->i_lock);
1499 EXPORT_SYMBOL(inode_claim_rsv_space);
1501 void inode_sub_rsv_space(struct inode *inode, qsize_t number)
1503 spin_lock(&inode->i_lock);
1504 *inode_reserved_space(inode) -= number;
1505 spin_unlock(&inode->i_lock);
1507 EXPORT_SYMBOL(inode_sub_rsv_space);
1509 static qsize_t inode_get_rsv_space(struct inode *inode)
1513 if (!inode->i_sb->dq_op->get_reserved_space)
1515 spin_lock(&inode->i_lock);
1516 ret = *inode_reserved_space(inode);
1517 spin_unlock(&inode->i_lock);
1521 static void inode_incr_space(struct inode *inode, qsize_t number,
1525 inode_add_rsv_space(inode, number);
1527 inode_add_bytes(inode, number);
1530 static void inode_decr_space(struct inode *inode, qsize_t number, int reserve)
1533 inode_sub_rsv_space(inode, number);
1535 inode_sub_bytes(inode, number);
1539 * This functions updates i_blocks+i_bytes fields and quota information
1540 * (together with appropriate checks).
1542 * NOTE: We absolutely rely on the fact that caller dirties the inode
1543 * (usually helpers in quotaops.h care about this) and holds a handle for
1544 * the current transaction so that dquot write and inode write go into the
1549 * This operation can block, but only after everything is updated
1551 int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags)
1554 char warntype[MAXQUOTAS];
1555 int warn = flags & DQUOT_SPACE_WARN;
1556 int reserve = flags & DQUOT_SPACE_RESERVE;
1557 int nofail = flags & DQUOT_SPACE_NOFAIL;
1560 * First test before acquiring mutex - solves deadlocks when we
1561 * re-enter the quota code and are already holding the mutex
1563 if (!dquot_active(inode)) {
1564 inode_incr_space(inode, number, reserve);
1568 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1569 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1570 warntype[cnt] = QUOTA_NL_NOWARN;
1572 spin_lock(&dq_data_lock);
1573 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1574 if (!inode->i_dquot[cnt])
1576 ret = check_bdq(inode->i_dquot[cnt], number, !warn,
1578 if (ret && !nofail) {
1579 spin_unlock(&dq_data_lock);
1580 goto out_flush_warn;
1583 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1584 if (!inode->i_dquot[cnt])
1587 dquot_resv_space(inode->i_dquot[cnt], number);
1589 dquot_incr_space(inode->i_dquot[cnt], number);
1591 inode_incr_space(inode, number, reserve);
1592 spin_unlock(&dq_data_lock);
1595 goto out_flush_warn;
1596 mark_all_dquot_dirty(inode->i_dquot);
1598 flush_warnings(inode->i_dquot, warntype);
1599 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1603 EXPORT_SYMBOL(__dquot_alloc_space);
1606 * This operation can block, but only after everything is updated
1608 int dquot_alloc_inode(const struct inode *inode)
1611 char warntype[MAXQUOTAS];
1613 /* First test before acquiring mutex - solves deadlocks when we
1614 * re-enter the quota code and are already holding the mutex */
1615 if (!dquot_active(inode))
1617 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1618 warntype[cnt] = QUOTA_NL_NOWARN;
1619 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1620 spin_lock(&dq_data_lock);
1621 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1622 if (!inode->i_dquot[cnt])
1624 ret = check_idq(inode->i_dquot[cnt], 1, warntype + cnt);
1629 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1630 if (!inode->i_dquot[cnt])
1632 dquot_incr_inodes(inode->i_dquot[cnt], 1);
1636 spin_unlock(&dq_data_lock);
1638 mark_all_dquot_dirty(inode->i_dquot);
1639 flush_warnings(inode->i_dquot, warntype);
1640 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1643 EXPORT_SYMBOL(dquot_alloc_inode);
1646 * Convert in-memory reserved quotas to real consumed quotas
1648 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
1652 if (!dquot_active(inode)) {
1653 inode_claim_rsv_space(inode, number);
1657 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1658 spin_lock(&dq_data_lock);
1659 /* Claim reserved quotas to allocated quotas */
1660 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1661 if (inode->i_dquot[cnt])
1662 dquot_claim_reserved_space(inode->i_dquot[cnt],
1665 /* Update inode bytes */
1666 inode_claim_rsv_space(inode, number);
1667 spin_unlock(&dq_data_lock);
1668 mark_all_dquot_dirty(inode->i_dquot);
1669 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1672 EXPORT_SYMBOL(dquot_claim_space_nodirty);
1675 * This operation can block, but only after everything is updated
1677 void __dquot_free_space(struct inode *inode, qsize_t number, int flags)
1680 char warntype[MAXQUOTAS];
1681 int reserve = flags & DQUOT_SPACE_RESERVE;
1683 /* First test before acquiring mutex - solves deadlocks when we
1684 * re-enter the quota code and are already holding the mutex */
1685 if (!dquot_active(inode)) {
1686 inode_decr_space(inode, number, reserve);
1690 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1691 spin_lock(&dq_data_lock);
1692 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1693 if (!inode->i_dquot[cnt])
1695 warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number);
1697 dquot_free_reserved_space(inode->i_dquot[cnt], number);
1699 dquot_decr_space(inode->i_dquot[cnt], number);
1701 inode_decr_space(inode, number, reserve);
1702 spin_unlock(&dq_data_lock);
1706 mark_all_dquot_dirty(inode->i_dquot);
1708 flush_warnings(inode->i_dquot, warntype);
1709 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1711 EXPORT_SYMBOL(__dquot_free_space);
1714 * This operation can block, but only after everything is updated
1716 void dquot_free_inode(const struct inode *inode)
1719 char warntype[MAXQUOTAS];
1721 /* First test before acquiring mutex - solves deadlocks when we
1722 * re-enter the quota code and are already holding the mutex */
1723 if (!dquot_active(inode))
1726 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1727 spin_lock(&dq_data_lock);
1728 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1729 if (!inode->i_dquot[cnt])
1731 warntype[cnt] = info_idq_free(inode->i_dquot[cnt], 1);
1732 dquot_decr_inodes(inode->i_dquot[cnt], 1);
1734 spin_unlock(&dq_data_lock);
1735 mark_all_dquot_dirty(inode->i_dquot);
1736 flush_warnings(inode->i_dquot, warntype);
1737 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1739 EXPORT_SYMBOL(dquot_free_inode);
1742 * Transfer the number of inode and blocks from one diskquota to an other.
1743 * On success, dquot references in transfer_to are consumed and references
1744 * to original dquots that need to be released are placed there. On failure,
1745 * references are kept untouched.
1747 * This operation can block, but only after everything is updated
1748 * A transaction must be started when entering this function.
1751 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to)
1753 qsize_t space, cur_space;
1754 qsize_t rsv_space = 0;
1755 struct dquot *transfer_from[MAXQUOTAS] = {};
1757 char is_valid[MAXQUOTAS] = {};
1758 char warntype_to[MAXQUOTAS];
1759 char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS];
1761 /* First test before acquiring mutex - solves deadlocks when we
1762 * re-enter the quota code and are already holding the mutex */
1763 if (IS_NOQUOTA(inode))
1765 /* Initialize the arrays */
1766 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1767 warntype_to[cnt] = QUOTA_NL_NOWARN;
1768 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1769 if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
1770 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1773 spin_lock(&dq_data_lock);
1774 cur_space = inode_get_bytes(inode);
1775 rsv_space = inode_get_rsv_space(inode);
1776 space = cur_space + rsv_space;
1777 /* Build the transfer_from list and check the limits */
1778 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1780 * Skip changes for same uid or gid or for turned off quota-type.
1782 if (!transfer_to[cnt])
1784 /* Avoid races with quotaoff() */
1785 if (!sb_has_quota_active(inode->i_sb, cnt))
1788 transfer_from[cnt] = inode->i_dquot[cnt];
1789 ret = check_idq(transfer_to[cnt], 1, warntype_to + cnt);
1792 ret = check_bdq(transfer_to[cnt], space, 0, warntype_to + cnt);
1798 * Finally perform the needed transfer from transfer_from to transfer_to
1800 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1803 /* Due to IO error we might not have transfer_from[] structure */
1804 if (transfer_from[cnt]) {
1805 warntype_from_inodes[cnt] =
1806 info_idq_free(transfer_from[cnt], 1);
1807 warntype_from_space[cnt] =
1808 info_bdq_free(transfer_from[cnt], space);
1809 dquot_decr_inodes(transfer_from[cnt], 1);
1810 dquot_decr_space(transfer_from[cnt], cur_space);
1811 dquot_free_reserved_space(transfer_from[cnt],
1815 dquot_incr_inodes(transfer_to[cnt], 1);
1816 dquot_incr_space(transfer_to[cnt], cur_space);
1817 dquot_resv_space(transfer_to[cnt], rsv_space);
1819 inode->i_dquot[cnt] = transfer_to[cnt];
1821 spin_unlock(&dq_data_lock);
1822 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1824 mark_all_dquot_dirty(transfer_from);
1825 mark_all_dquot_dirty(transfer_to);
1826 flush_warnings(transfer_to, warntype_to);
1827 flush_warnings(transfer_from, warntype_from_inodes);
1828 flush_warnings(transfer_from, warntype_from_space);
1829 /* Pass back references to put */
1830 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1832 transfer_to[cnt] = transfer_from[cnt];
1835 spin_unlock(&dq_data_lock);
1836 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1837 flush_warnings(transfer_to, warntype_to);
1840 EXPORT_SYMBOL(__dquot_transfer);
1842 /* Wrapper for transferring ownership of an inode for uid/gid only
1843 * Called from FSXXX_setattr()
1845 int dquot_transfer(struct inode *inode, struct iattr *iattr)
1847 struct dquot *transfer_to[MAXQUOTAS] = {};
1848 struct super_block *sb = inode->i_sb;
1851 if (!dquot_active(inode))
1854 if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid)
1855 transfer_to[USRQUOTA] = dqget(sb, iattr->ia_uid, USRQUOTA);
1856 if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)
1857 transfer_to[GRPQUOTA] = dqget(sb, iattr->ia_gid, GRPQUOTA);
1859 ret = __dquot_transfer(inode, transfer_to);
1860 dqput_all(transfer_to);
1863 EXPORT_SYMBOL(dquot_transfer);
1866 * Write info of quota file to disk
1868 int dquot_commit_info(struct super_block *sb, int type)
1871 struct quota_info *dqopt = sb_dqopt(sb);
1873 mutex_lock(&dqopt->dqio_mutex);
1874 ret = dqopt->ops[type]->write_file_info(sb, type);
1875 mutex_unlock(&dqopt->dqio_mutex);
1878 EXPORT_SYMBOL(dquot_commit_info);
1881 * Definitions of diskquota operations.
1883 const struct dquot_operations dquot_operations = {
1884 .write_dquot = dquot_commit,
1885 .acquire_dquot = dquot_acquire,
1886 .release_dquot = dquot_release,
1887 .mark_dirty = dquot_mark_dquot_dirty,
1888 .write_info = dquot_commit_info,
1889 .alloc_dquot = dquot_alloc,
1890 .destroy_dquot = dquot_destroy,
1892 EXPORT_SYMBOL(dquot_operations);
1895 * Generic helper for ->open on filesystems supporting disk quotas.
1897 int dquot_file_open(struct inode *inode, struct file *file)
1901 error = generic_file_open(inode, file);
1902 if (!error && (file->f_mode & FMODE_WRITE))
1903 dquot_initialize(inode);
1906 EXPORT_SYMBOL(dquot_file_open);
1909 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1911 int dquot_disable(struct super_block *sb, int type, unsigned int flags)
1914 struct quota_info *dqopt = sb_dqopt(sb);
1915 struct inode *toputinode[MAXQUOTAS];
1917 /* Cannot turn off usage accounting without turning off limits, or
1918 * suspend quotas and simultaneously turn quotas off. */
1919 if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED))
1920 || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED |
1921 DQUOT_USAGE_ENABLED)))
1924 /* We need to serialize quota_off() for device */
1925 mutex_lock(&dqopt->dqonoff_mutex);
1928 * Skip everything if there's nothing to do. We have to do this because
1929 * sometimes we are called when fill_super() failed and calling
1930 * sync_fs() in such cases does no good.
1932 if (!sb_any_quota_loaded(sb)) {
1933 mutex_unlock(&dqopt->dqonoff_mutex);
1936 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1937 toputinode[cnt] = NULL;
1938 if (type != -1 && cnt != type)
1940 if (!sb_has_quota_loaded(sb, cnt))
1943 if (flags & DQUOT_SUSPENDED) {
1944 spin_lock(&dq_state_lock);
1946 dquot_state_flag(DQUOT_SUSPENDED, cnt);
1947 spin_unlock(&dq_state_lock);
1949 spin_lock(&dq_state_lock);
1950 dqopt->flags &= ~dquot_state_flag(flags, cnt);
1951 /* Turning off suspended quotas? */
1952 if (!sb_has_quota_loaded(sb, cnt) &&
1953 sb_has_quota_suspended(sb, cnt)) {
1954 dqopt->flags &= ~dquot_state_flag(
1955 DQUOT_SUSPENDED, cnt);
1956 spin_unlock(&dq_state_lock);
1957 iput(dqopt->files[cnt]);
1958 dqopt->files[cnt] = NULL;
1961 spin_unlock(&dq_state_lock);
1964 /* We still have to keep quota loaded? */
1965 if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED))
1968 /* Note: these are blocking operations */
1969 drop_dquot_ref(sb, cnt);
1970 invalidate_dquots(sb, cnt);
1972 * Now all dquots should be invalidated, all writes done so we
1973 * should be only users of the info. No locks needed.
1975 if (info_dirty(&dqopt->info[cnt]))
1976 sb->dq_op->write_info(sb, cnt);
1977 if (dqopt->ops[cnt]->free_file_info)
1978 dqopt->ops[cnt]->free_file_info(sb, cnt);
1979 put_quota_format(dqopt->info[cnt].dqi_format);
1981 toputinode[cnt] = dqopt->files[cnt];
1982 if (!sb_has_quota_loaded(sb, cnt))
1983 dqopt->files[cnt] = NULL;
1984 dqopt->info[cnt].dqi_flags = 0;
1985 dqopt->info[cnt].dqi_igrace = 0;
1986 dqopt->info[cnt].dqi_bgrace = 0;
1987 dqopt->ops[cnt] = NULL;
1989 mutex_unlock(&dqopt->dqonoff_mutex);
1991 /* Skip syncing and setting flags if quota files are hidden */
1992 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
1995 /* Sync the superblock so that buffers with quota data are written to
1996 * disk (and so userspace sees correct data afterwards). */
1997 if (sb->s_op->sync_fs)
1998 sb->s_op->sync_fs(sb, 1);
1999 sync_blockdev(sb->s_bdev);
2000 /* Now the quota files are just ordinary files and we can set the
2001 * inode flags back. Moreover we discard the pagecache so that
2002 * userspace sees the writes we did bypassing the pagecache. We
2003 * must also discard the blockdev buffers so that we see the
2004 * changes done by userspace on the next quotaon() */
2005 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
2006 if (toputinode[cnt]) {
2007 mutex_lock(&dqopt->dqonoff_mutex);
2008 /* If quota was reenabled in the meantime, we have
2010 if (!sb_has_quota_loaded(sb, cnt)) {
2011 mutex_lock_nested(&toputinode[cnt]->i_mutex,
2013 toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
2014 S_NOATIME | S_NOQUOTA);
2015 truncate_inode_pages(&toputinode[cnt]->i_data,
2017 mutex_unlock(&toputinode[cnt]->i_mutex);
2018 mark_inode_dirty_sync(toputinode[cnt]);
2020 mutex_unlock(&dqopt->dqonoff_mutex);
2023 invalidate_bdev(sb->s_bdev);
2025 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
2026 if (toputinode[cnt]) {
2027 /* On remount RO, we keep the inode pointer so that we
2028 * can reenable quota on the subsequent remount RW. We
2029 * have to check 'flags' variable and not use sb_has_
2030 * function because another quotaon / quotaoff could
2031 * change global state before we got here. We refuse
2032 * to suspend quotas when there is pending delete on
2033 * the quota file... */
2034 if (!(flags & DQUOT_SUSPENDED))
2035 iput(toputinode[cnt]);
2036 else if (!toputinode[cnt]->i_nlink)
2041 EXPORT_SYMBOL(dquot_disable);
2043 int dquot_quota_off(struct super_block *sb, int type)
2045 return dquot_disable(sb, type,
2046 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
2048 EXPORT_SYMBOL(dquot_quota_off);
2051 * Turn quotas on on a device
2055 * Helper function to turn quotas on when we already have the inode of
2056 * quota file and no quota information is loaded.
2058 static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
2061 struct quota_format_type *fmt = find_quota_format(format_id);
2062 struct super_block *sb = inode->i_sb;
2063 struct quota_info *dqopt = sb_dqopt(sb);
2069 if (!S_ISREG(inode->i_mode)) {
2073 if (IS_RDONLY(inode)) {
2077 if (!sb->s_op->quota_write || !sb->s_op->quota_read) {
2081 /* Usage always has to be set... */
2082 if (!(flags & DQUOT_USAGE_ENABLED)) {
2087 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2088 /* As we bypass the pagecache we must now flush all the
2089 * dirty data and invalidate caches so that kernel sees
2090 * changes from userspace. It is not enough to just flush
2091 * the quota file since if blocksize < pagesize, invalidation
2092 * of the cache could fail because of other unrelated dirty
2094 sync_filesystem(sb);
2095 invalidate_bdev(sb->s_bdev);
2097 mutex_lock(&dqopt->dqonoff_mutex);
2098 if (sb_has_quota_loaded(sb, type)) {
2103 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2104 /* We don't want quota and atime on quota files (deadlocks
2105 * possible) Also nobody should write to the file - we use
2106 * special IO operations which ignore the immutable bit. */
2107 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2108 oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE |
2110 inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
2111 mutex_unlock(&inode->i_mutex);
2113 * When S_NOQUOTA is set, remove dquot references as no more
2114 * references can be added
2116 __dquot_drop(inode);
2120 dqopt->files[type] = igrab(inode);
2121 if (!dqopt->files[type])
2124 if (!fmt->qf_ops->check_quota_file(sb, type))
2127 dqopt->ops[type] = fmt->qf_ops;
2128 dqopt->info[type].dqi_format = fmt;
2129 dqopt->info[type].dqi_fmt_id = format_id;
2130 INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
2131 mutex_lock(&dqopt->dqio_mutex);
2132 error = dqopt->ops[type]->read_file_info(sb, type);
2134 mutex_unlock(&dqopt->dqio_mutex);
2137 mutex_unlock(&dqopt->dqio_mutex);
2138 spin_lock(&dq_state_lock);
2139 dqopt->flags |= dquot_state_flag(flags, type);
2140 spin_unlock(&dq_state_lock);
2142 add_dquot_ref(sb, type);
2143 mutex_unlock(&dqopt->dqonoff_mutex);
2148 dqopt->files[type] = NULL;
2151 if (oldflags != -1) {
2152 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2153 /* Set the flags back (in the case of accidental quotaon()
2154 * on a wrong file we don't want to mess up the flags) */
2155 inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
2156 inode->i_flags |= oldflags;
2157 mutex_unlock(&inode->i_mutex);
2159 mutex_unlock(&dqopt->dqonoff_mutex);
2161 put_quota_format(fmt);
2166 /* Reenable quotas on remount RW */
2167 int dquot_resume(struct super_block *sb, int type)
2169 struct quota_info *dqopt = sb_dqopt(sb);
2170 struct inode *inode;
2174 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
2175 if (type != -1 && cnt != type)
2178 mutex_lock(&dqopt->dqonoff_mutex);
2179 if (!sb_has_quota_suspended(sb, cnt)) {
2180 mutex_unlock(&dqopt->dqonoff_mutex);
2183 inode = dqopt->files[cnt];
2184 dqopt->files[cnt] = NULL;
2185 spin_lock(&dq_state_lock);
2186 flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
2187 DQUOT_LIMITS_ENABLED,
2189 dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt);
2190 spin_unlock(&dq_state_lock);
2191 mutex_unlock(&dqopt->dqonoff_mutex);
2193 flags = dquot_generic_flag(flags, cnt);
2194 ret = vfs_load_quota_inode(inode, cnt,
2195 dqopt->info[cnt].dqi_fmt_id, flags);
2201 EXPORT_SYMBOL(dquot_resume);
2203 int dquot_quota_on(struct super_block *sb, int type, int format_id,
2206 int error = security_quota_on(path->dentry);
2209 /* Quota file not on the same filesystem? */
2210 if (path->mnt->mnt_sb != sb)
2213 error = vfs_load_quota_inode(path->dentry->d_inode, type,
2214 format_id, DQUOT_USAGE_ENABLED |
2215 DQUOT_LIMITS_ENABLED);
2218 EXPORT_SYMBOL(dquot_quota_on);
2221 * More powerful function for turning on quotas allowing setting
2222 * of individual quota flags
2224 int dquot_enable(struct inode *inode, int type, int format_id,
2228 struct super_block *sb = inode->i_sb;
2229 struct quota_info *dqopt = sb_dqopt(sb);
2231 /* Just unsuspend quotas? */
2232 BUG_ON(flags & DQUOT_SUSPENDED);
2236 /* Just updating flags needed? */
2237 if (sb_has_quota_loaded(sb, type)) {
2238 mutex_lock(&dqopt->dqonoff_mutex);
2239 /* Now do a reliable test... */
2240 if (!sb_has_quota_loaded(sb, type)) {
2241 mutex_unlock(&dqopt->dqonoff_mutex);
2244 if (flags & DQUOT_USAGE_ENABLED &&
2245 sb_has_quota_usage_enabled(sb, type)) {
2249 if (flags & DQUOT_LIMITS_ENABLED &&
2250 sb_has_quota_limits_enabled(sb, type)) {
2254 spin_lock(&dq_state_lock);
2255 sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
2256 spin_unlock(&dq_state_lock);
2258 mutex_unlock(&dqopt->dqonoff_mutex);
2263 return vfs_load_quota_inode(inode, type, format_id, flags);
2265 EXPORT_SYMBOL(dquot_enable);
2268 * This function is used when filesystem needs to initialize quotas
2269 * during mount time.
2271 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
2272 int format_id, int type)
2274 struct dentry *dentry;
2277 mutex_lock(&sb->s_root->d_inode->i_mutex);
2278 dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
2279 mutex_unlock(&sb->s_root->d_inode->i_mutex);
2281 return PTR_ERR(dentry);
2283 if (!dentry->d_inode) {
2288 error = security_quota_on(dentry);
2290 error = vfs_load_quota_inode(dentry->d_inode, type, format_id,
2291 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
2297 EXPORT_SYMBOL(dquot_quota_on_mount);
2299 static inline qsize_t qbtos(qsize_t blocks)
2301 return blocks << QIF_DQBLKSIZE_BITS;
2304 static inline qsize_t stoqb(qsize_t space)
2306 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
2309 /* Generic routine for getting common part of quota structure */
2310 static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di)
2312 struct mem_dqblk *dm = &dquot->dq_dqb;
2314 memset(di, 0, sizeof(*di));
2315 di->d_version = FS_DQUOT_VERSION;
2316 di->d_flags = dquot->dq_type == USRQUOTA ?
2317 FS_USER_QUOTA : FS_GROUP_QUOTA;
2318 di->d_id = dquot->dq_id;
2320 spin_lock(&dq_data_lock);
2321 di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit);
2322 di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit);
2323 di->d_ino_hardlimit = dm->dqb_ihardlimit;
2324 di->d_ino_softlimit = dm->dqb_isoftlimit;
2325 di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace;
2326 di->d_icount = dm->dqb_curinodes;
2327 di->d_btimer = dm->dqb_btime;
2328 di->d_itimer = dm->dqb_itime;
2329 spin_unlock(&dq_data_lock);
2332 int dquot_get_dqblk(struct super_block *sb, int type, qid_t id,
2333 struct fs_disk_quota *di)
2335 struct dquot *dquot;
2337 dquot = dqget(sb, id, type);
2340 do_get_dqblk(dquot, di);
2345 EXPORT_SYMBOL(dquot_get_dqblk);
2347 #define VFS_FS_DQ_MASK \
2348 (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \
2349 FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \
2350 FS_DQ_BTIMER | FS_DQ_ITIMER)
2352 /* Generic routine for setting common part of quota structure */
2353 static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *di)
2355 struct mem_dqblk *dm = &dquot->dq_dqb;
2356 int check_blim = 0, check_ilim = 0;
2357 struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
2359 if (di->d_fieldmask & ~VFS_FS_DQ_MASK)
2362 if (((di->d_fieldmask & FS_DQ_BSOFT) &&
2363 (di->d_blk_softlimit > dqi->dqi_maxblimit)) ||
2364 ((di->d_fieldmask & FS_DQ_BHARD) &&
2365 (di->d_blk_hardlimit > dqi->dqi_maxblimit)) ||
2366 ((di->d_fieldmask & FS_DQ_ISOFT) &&
2367 (di->d_ino_softlimit > dqi->dqi_maxilimit)) ||
2368 ((di->d_fieldmask & FS_DQ_IHARD) &&
2369 (di->d_ino_hardlimit > dqi->dqi_maxilimit)))
2372 spin_lock(&dq_data_lock);
2373 if (di->d_fieldmask & FS_DQ_BCOUNT) {
2374 dm->dqb_curspace = di->d_bcount - dm->dqb_rsvspace;
2376 set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
2379 if (di->d_fieldmask & FS_DQ_BSOFT)
2380 dm->dqb_bsoftlimit = qbtos(di->d_blk_softlimit);
2381 if (di->d_fieldmask & FS_DQ_BHARD)
2382 dm->dqb_bhardlimit = qbtos(di->d_blk_hardlimit);
2383 if (di->d_fieldmask & (FS_DQ_BSOFT | FS_DQ_BHARD)) {
2385 set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
2388 if (di->d_fieldmask & FS_DQ_ICOUNT) {
2389 dm->dqb_curinodes = di->d_icount;
2391 set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
2394 if (di->d_fieldmask & FS_DQ_ISOFT)
2395 dm->dqb_isoftlimit = di->d_ino_softlimit;
2396 if (di->d_fieldmask & FS_DQ_IHARD)
2397 dm->dqb_ihardlimit = di->d_ino_hardlimit;
2398 if (di->d_fieldmask & (FS_DQ_ISOFT | FS_DQ_IHARD)) {
2400 set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
2403 if (di->d_fieldmask & FS_DQ_BTIMER) {
2404 dm->dqb_btime = di->d_btimer;
2406 set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
2409 if (di->d_fieldmask & FS_DQ_ITIMER) {
2410 dm->dqb_itime = di->d_itimer;
2412 set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
2416 if (!dm->dqb_bsoftlimit ||
2417 dm->dqb_curspace < dm->dqb_bsoftlimit) {
2419 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
2420 } else if (!(di->d_fieldmask & FS_DQ_BTIMER))
2421 /* Set grace only if user hasn't provided his own... */
2422 dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
2425 if (!dm->dqb_isoftlimit ||
2426 dm->dqb_curinodes < dm->dqb_isoftlimit) {
2428 clear_bit(DQ_INODES_B, &dquot->dq_flags);
2429 } else if (!(di->d_fieldmask & FS_DQ_ITIMER))
2430 /* Set grace only if user hasn't provided his own... */
2431 dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
2433 if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit ||
2435 clear_bit(DQ_FAKE_B, &dquot->dq_flags);
2437 set_bit(DQ_FAKE_B, &dquot->dq_flags);
2438 spin_unlock(&dq_data_lock);
2439 mark_dquot_dirty(dquot);
2444 int dquot_set_dqblk(struct super_block *sb, int type, qid_t id,
2445 struct fs_disk_quota *di)
2447 struct dquot *dquot;
2450 dquot = dqget(sb, id, type);
2455 rc = do_set_dqblk(dquot, di);
2460 EXPORT_SYMBOL(dquot_set_dqblk);
2462 /* Generic routine for getting common part of quota file information */
2463 int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2465 struct mem_dqinfo *mi;
2467 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2468 if (!sb_has_quota_active(sb, type)) {
2469 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2472 mi = sb_dqopt(sb)->info + type;
2473 spin_lock(&dq_data_lock);
2474 ii->dqi_bgrace = mi->dqi_bgrace;
2475 ii->dqi_igrace = mi->dqi_igrace;
2476 ii->dqi_flags = mi->dqi_flags & DQF_MASK;
2477 ii->dqi_valid = IIF_ALL;
2478 spin_unlock(&dq_data_lock);
2479 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2482 EXPORT_SYMBOL(dquot_get_dqinfo);
2484 /* Generic routine for setting common part of quota file information */
2485 int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2487 struct mem_dqinfo *mi;
2490 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2491 if (!sb_has_quota_active(sb, type)) {
2495 mi = sb_dqopt(sb)->info + type;
2496 spin_lock(&dq_data_lock);
2497 if (ii->dqi_valid & IIF_BGRACE)
2498 mi->dqi_bgrace = ii->dqi_bgrace;
2499 if (ii->dqi_valid & IIF_IGRACE)
2500 mi->dqi_igrace = ii->dqi_igrace;
2501 if (ii->dqi_valid & IIF_FLAGS)
2502 mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) |
2503 (ii->dqi_flags & DQF_MASK);
2504 spin_unlock(&dq_data_lock);
2505 mark_info_dirty(sb, type);
2506 /* Force write to disk */
2507 sb->dq_op->write_info(sb, type);
2509 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2512 EXPORT_SYMBOL(dquot_set_dqinfo);
2514 const struct quotactl_ops dquot_quotactl_ops = {
2515 .quota_on = dquot_quota_on,
2516 .quota_off = dquot_quota_off,
2517 .quota_sync = dquot_quota_sync,
2518 .get_info = dquot_get_dqinfo,
2519 .set_info = dquot_set_dqinfo,
2520 .get_dqblk = dquot_get_dqblk,
2521 .set_dqblk = dquot_set_dqblk
2523 EXPORT_SYMBOL(dquot_quotactl_ops);
2525 static int do_proc_dqstats(struct ctl_table *table, int write,
2526 void __user *buffer, size_t *lenp, loff_t *ppos)
2528 unsigned int type = (int *)table->data - dqstats.stat;
2530 /* Update global table */
2531 dqstats.stat[type] =
2532 percpu_counter_sum_positive(&dqstats.counter[type]);
2533 return proc_dointvec(table, write, buffer, lenp, ppos);
2536 static ctl_table fs_dqstats_table[] = {
2538 .procname = "lookups",
2539 .data = &dqstats.stat[DQST_LOOKUPS],
2540 .maxlen = sizeof(int),
2542 .proc_handler = do_proc_dqstats,
2545 .procname = "drops",
2546 .data = &dqstats.stat[DQST_DROPS],
2547 .maxlen = sizeof(int),
2549 .proc_handler = do_proc_dqstats,
2552 .procname = "reads",
2553 .data = &dqstats.stat[DQST_READS],
2554 .maxlen = sizeof(int),
2556 .proc_handler = do_proc_dqstats,
2559 .procname = "writes",
2560 .data = &dqstats.stat[DQST_WRITES],
2561 .maxlen = sizeof(int),
2563 .proc_handler = do_proc_dqstats,
2566 .procname = "cache_hits",
2567 .data = &dqstats.stat[DQST_CACHE_HITS],
2568 .maxlen = sizeof(int),
2570 .proc_handler = do_proc_dqstats,
2573 .procname = "allocated_dquots",
2574 .data = &dqstats.stat[DQST_ALLOC_DQUOTS],
2575 .maxlen = sizeof(int),
2577 .proc_handler = do_proc_dqstats,
2580 .procname = "free_dquots",
2581 .data = &dqstats.stat[DQST_FREE_DQUOTS],
2582 .maxlen = sizeof(int),
2584 .proc_handler = do_proc_dqstats,
2587 .procname = "syncs",
2588 .data = &dqstats.stat[DQST_SYNCS],
2589 .maxlen = sizeof(int),
2591 .proc_handler = do_proc_dqstats,
2593 #ifdef CONFIG_PRINT_QUOTA_WARNING
2595 .procname = "warnings",
2596 .data = &flag_print_warnings,
2597 .maxlen = sizeof(int),
2599 .proc_handler = proc_dointvec,
2605 static ctl_table fs_table[] = {
2607 .procname = "quota",
2609 .child = fs_dqstats_table,
2614 static ctl_table sys_table[] = {
2623 static int __init dquot_init(void)
2626 unsigned long nr_hash, order;
2628 printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
2630 register_sysctl_table(sys_table);
2632 dquot_cachep = kmem_cache_create("dquot",
2633 sizeof(struct dquot), sizeof(unsigned long) * 4,
2634 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
2635 SLAB_MEM_SPREAD|SLAB_PANIC),
2639 dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
2641 panic("Cannot create dquot hash table");
2643 for (i = 0; i < _DQST_DQSTAT_LAST; i++) {
2644 ret = percpu_counter_init(&dqstats.counter[i], 0);
2646 panic("Cannot create dquot stat counters");
2649 /* Find power-of-two hlist_heads which can fit into allocation */
2650 nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
2654 } while (nr_hash >> dq_hash_bits);
2657 nr_hash = 1UL << dq_hash_bits;
2658 dq_hash_mask = nr_hash - 1;
2659 for (i = 0; i < nr_hash; i++)
2660 INIT_HLIST_HEAD(dquot_hash + i);
2662 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2663 nr_hash, order, (PAGE_SIZE << order));
2665 register_shrinker(&dqcache_shrinker);
2669 module_init(dquot_init);