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/sched.h>
75 #include <linux/kmod.h>
76 #include <linux/namei.h>
77 #include <linux/capability.h>
78 #include <linux/quotaops.h>
79 #include "../internal.h" /* ugh */
81 #include <linux/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 * dqonoff_mutex > i_mutex > journal_lock > dqptr_sem > dquot->dq_lock >
121 * dqonoff_mutex > i_mutex comes from dquot_quota_sync, dquot_enable, etc.
122 * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
123 * dqptr_sem. But filesystem has to count with the fact that functions such as
124 * dquot_alloc_space() acquire dqptr_sem and they usually have to be called
125 * from inside a transaction to keep filesystem consistency after a crash. Also
126 * filesystems usually want to do some IO on dquot from ->mark_dirty which is
127 * called with dqptr_sem held.
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, struct kqid qid)
258 unsigned int id = from_kqid(&init_user_ns, qid);
262 tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
263 return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
267 * Following list functions expect dq_list_lock to be held
269 static inline void insert_dquot_hash(struct dquot *dquot)
271 struct hlist_head *head;
272 head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id);
273 hlist_add_head(&dquot->dq_hash, head);
276 static inline void remove_dquot_hash(struct dquot *dquot)
278 hlist_del_init(&dquot->dq_hash);
281 static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb,
284 struct hlist_node *node;
287 hlist_for_each (node, dquot_hash+hashent) {
288 dquot = hlist_entry(node, struct dquot, dq_hash);
289 if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid))
295 /* Add a dquot to the tail of the free list */
296 static inline void put_dquot_last(struct dquot *dquot)
298 list_add_tail(&dquot->dq_free, &free_dquots);
299 dqstats_inc(DQST_FREE_DQUOTS);
302 static inline void remove_free_dquot(struct dquot *dquot)
304 if (list_empty(&dquot->dq_free))
306 list_del_init(&dquot->dq_free);
307 dqstats_dec(DQST_FREE_DQUOTS);
310 static inline void put_inuse(struct dquot *dquot)
312 /* We add to the back of inuse list so we don't have to restart
313 * when traversing this list and we block */
314 list_add_tail(&dquot->dq_inuse, &inuse_list);
315 dqstats_inc(DQST_ALLOC_DQUOTS);
318 static inline void remove_inuse(struct dquot *dquot)
320 dqstats_dec(DQST_ALLOC_DQUOTS);
321 list_del(&dquot->dq_inuse);
324 * End of list functions needing dq_list_lock
327 static void wait_on_dquot(struct dquot *dquot)
329 mutex_lock(&dquot->dq_lock);
330 mutex_unlock(&dquot->dq_lock);
333 static inline int dquot_dirty(struct dquot *dquot)
335 return test_bit(DQ_MOD_B, &dquot->dq_flags);
338 static inline int mark_dquot_dirty(struct dquot *dquot)
340 return dquot->dq_sb->dq_op->mark_dirty(dquot);
343 /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */
344 int dquot_mark_dquot_dirty(struct dquot *dquot)
348 /* If quota is dirty already, we don't have to acquire dq_list_lock */
349 if (test_bit(DQ_MOD_B, &dquot->dq_flags))
352 spin_lock(&dq_list_lock);
353 if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) {
354 list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
355 info[dquot->dq_id.type].dqi_dirty_list);
358 spin_unlock(&dq_list_lock);
361 EXPORT_SYMBOL(dquot_mark_dquot_dirty);
363 /* Dirtify all the dquots - this can block when journalling */
364 static inline int mark_all_dquot_dirty(struct dquot * const *dquot)
369 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
371 /* Even in case of error we have to continue */
372 ret = mark_dquot_dirty(dquot[cnt]);
379 static inline void dqput_all(struct dquot **dquot)
383 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
387 /* This function needs dq_list_lock */
388 static inline int clear_dquot_dirty(struct dquot *dquot)
390 if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
392 list_del_init(&dquot->dq_dirty);
396 void mark_info_dirty(struct super_block *sb, int type)
398 set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
400 EXPORT_SYMBOL(mark_info_dirty);
403 * Read dquot from disk and alloc space for it
406 int dquot_acquire(struct dquot *dquot)
408 int ret = 0, ret2 = 0;
409 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
411 mutex_lock(&dquot->dq_lock);
412 mutex_lock(&dqopt->dqio_mutex);
413 if (!test_bit(DQ_READ_B, &dquot->dq_flags))
414 ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot);
417 set_bit(DQ_READ_B, &dquot->dq_flags);
418 /* Instantiate dquot if needed */
419 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
420 ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot);
421 /* Write the info if needed */
422 if (info_dirty(&dqopt->info[dquot->dq_id.type])) {
423 ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info(
424 dquot->dq_sb, dquot->dq_id.type);
433 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
435 mutex_unlock(&dqopt->dqio_mutex);
436 mutex_unlock(&dquot->dq_lock);
439 EXPORT_SYMBOL(dquot_acquire);
442 * Write dquot to disk
444 int dquot_commit(struct dquot *dquot)
447 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
449 mutex_lock(&dqopt->dqio_mutex);
450 spin_lock(&dq_list_lock);
451 if (!clear_dquot_dirty(dquot)) {
452 spin_unlock(&dq_list_lock);
455 spin_unlock(&dq_list_lock);
456 /* Inactive dquot can be only if there was error during read/init
457 * => we have better not writing it */
458 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
459 ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot);
463 mutex_unlock(&dqopt->dqio_mutex);
466 EXPORT_SYMBOL(dquot_commit);
471 int dquot_release(struct dquot *dquot)
473 int ret = 0, ret2 = 0;
474 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
476 mutex_lock(&dquot->dq_lock);
477 /* Check whether we are not racing with some other dqget() */
478 if (atomic_read(&dquot->dq_count) > 1)
480 mutex_lock(&dqopt->dqio_mutex);
481 if (dqopt->ops[dquot->dq_id.type]->release_dqblk) {
482 ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot);
484 if (info_dirty(&dqopt->info[dquot->dq_id.type])) {
485 ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info(
486 dquot->dq_sb, dquot->dq_id.type);
491 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
492 mutex_unlock(&dqopt->dqio_mutex);
494 mutex_unlock(&dquot->dq_lock);
497 EXPORT_SYMBOL(dquot_release);
499 void dquot_destroy(struct dquot *dquot)
501 kmem_cache_free(dquot_cachep, dquot);
503 EXPORT_SYMBOL(dquot_destroy);
505 static inline void do_destroy_dquot(struct dquot *dquot)
507 dquot->dq_sb->dq_op->destroy_dquot(dquot);
510 /* Invalidate all dquots on the list. Note that this function is called after
511 * quota is disabled and pointers from inodes removed so there cannot be new
512 * quota users. There can still be some users of quotas due to inodes being
513 * just deleted or pruned by prune_icache() (those are not attached to any
514 * list) or parallel quotactl call. We have to wait for such users.
516 static void invalidate_dquots(struct super_block *sb, int type)
518 struct dquot *dquot, *tmp;
521 spin_lock(&dq_list_lock);
522 list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
523 if (dquot->dq_sb != sb)
525 if (dquot->dq_id.type != type)
527 /* Wait for dquot users */
528 if (atomic_read(&dquot->dq_count)) {
531 atomic_inc(&dquot->dq_count);
532 prepare_to_wait(&dquot->dq_wait_unused, &wait,
533 TASK_UNINTERRUPTIBLE);
534 spin_unlock(&dq_list_lock);
535 /* Once dqput() wakes us up, we know it's time to free
537 * IMPORTANT: we rely on the fact that there is always
538 * at most one process waiting for dquot to free.
539 * Otherwise dq_count would be > 1 and we would never
542 if (atomic_read(&dquot->dq_count) > 1)
544 finish_wait(&dquot->dq_wait_unused, &wait);
546 /* At this moment dquot() need not exist (it could be
547 * reclaimed by prune_dqcache(). Hence we must
552 * Quota now has no users and it has been written on last
555 remove_dquot_hash(dquot);
556 remove_free_dquot(dquot);
558 do_destroy_dquot(dquot);
560 spin_unlock(&dq_list_lock);
563 /* Call callback for every active dquot on given filesystem */
564 int dquot_scan_active(struct super_block *sb,
565 int (*fn)(struct dquot *dquot, unsigned long priv),
568 struct dquot *dquot, *old_dquot = NULL;
571 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
572 spin_lock(&dq_list_lock);
573 list_for_each_entry(dquot, &inuse_list, dq_inuse) {
574 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
576 if (dquot->dq_sb != sb)
578 /* Now we have active dquot so we can just increase use count */
579 atomic_inc(&dquot->dq_count);
580 spin_unlock(&dq_list_lock);
581 dqstats_inc(DQST_LOOKUPS);
584 ret = fn(dquot, priv);
587 spin_lock(&dq_list_lock);
588 /* We are safe to continue now because our dquot could not
589 * be moved out of the inuse list while we hold the reference */
591 spin_unlock(&dq_list_lock);
594 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
597 EXPORT_SYMBOL(dquot_scan_active);
599 /* Write all dquot structures to quota files */
600 int dquot_writeback_dquots(struct super_block *sb, int type)
602 struct list_head *dirty;
604 struct quota_info *dqopt = sb_dqopt(sb);
608 mutex_lock(&dqopt->dqonoff_mutex);
609 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
610 if (type != -1 && cnt != type)
612 if (!sb_has_quota_active(sb, cnt))
614 spin_lock(&dq_list_lock);
615 dirty = &dqopt->info[cnt].dqi_dirty_list;
616 while (!list_empty(dirty)) {
617 dquot = list_first_entry(dirty, struct dquot,
619 /* Dirty and inactive can be only bad dquot... */
620 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
621 clear_dquot_dirty(dquot);
624 /* Now we have active dquot from which someone is
625 * holding reference so we can safely just increase
627 atomic_inc(&dquot->dq_count);
628 spin_unlock(&dq_list_lock);
629 dqstats_inc(DQST_LOOKUPS);
630 err = sb->dq_op->write_dquot(dquot);
634 spin_lock(&dq_list_lock);
636 spin_unlock(&dq_list_lock);
639 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
640 if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt)
641 && info_dirty(&dqopt->info[cnt]))
642 sb->dq_op->write_info(sb, cnt);
643 dqstats_inc(DQST_SYNCS);
644 mutex_unlock(&dqopt->dqonoff_mutex);
648 EXPORT_SYMBOL(dquot_writeback_dquots);
650 /* Write all dquot structures to disk and make them visible from userspace */
651 int dquot_quota_sync(struct super_block *sb, int type)
653 struct quota_info *dqopt = sb_dqopt(sb);
657 ret = dquot_writeback_dquots(sb, type);
660 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
663 /* This is not very clever (and fast) but currently I don't know about
664 * any other simple way of getting quota data to disk and we must get
665 * them there for userspace to be visible... */
666 if (sb->s_op->sync_fs)
667 sb->s_op->sync_fs(sb, 1);
668 sync_blockdev(sb->s_bdev);
671 * Now when everything is written we can discard the pagecache so
672 * that userspace sees the changes.
674 mutex_lock(&dqopt->dqonoff_mutex);
675 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
676 if (type != -1 && cnt != type)
678 if (!sb_has_quota_active(sb, cnt))
680 mutex_lock(&dqopt->files[cnt]->i_mutex);
681 truncate_inode_pages(&dqopt->files[cnt]->i_data, 0);
682 mutex_unlock(&dqopt->files[cnt]->i_mutex);
684 mutex_unlock(&dqopt->dqonoff_mutex);
688 EXPORT_SYMBOL(dquot_quota_sync);
691 dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
693 struct list_head *head;
695 unsigned long freed = 0;
697 head = free_dquots.prev;
698 while (head != &free_dquots && sc->nr_to_scan) {
699 dquot = list_entry(head, struct dquot, dq_free);
700 remove_dquot_hash(dquot);
701 remove_free_dquot(dquot);
703 do_destroy_dquot(dquot);
706 head = free_dquots.prev;
712 dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
714 return vfs_pressure_ratio(
715 percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS]));
718 static struct shrinker dqcache_shrinker = {
719 .count_objects = dqcache_shrink_count,
720 .scan_objects = dqcache_shrink_scan,
721 .seeks = DEFAULT_SEEKS,
725 * Put reference to dquot
726 * NOTE: If you change this function please check whether dqput_blocks() works right...
728 void dqput(struct dquot *dquot)
734 #ifdef CONFIG_QUOTA_DEBUG
735 if (!atomic_read(&dquot->dq_count)) {
736 quota_error(dquot->dq_sb, "trying to free free dquot of %s %d",
737 quotatypes[dquot->dq_id.type],
738 from_kqid(&init_user_ns, dquot->dq_id));
742 dqstats_inc(DQST_DROPS);
744 spin_lock(&dq_list_lock);
745 if (atomic_read(&dquot->dq_count) > 1) {
746 /* We have more than one user... nothing to do */
747 atomic_dec(&dquot->dq_count);
748 /* Releasing dquot during quotaoff phase? */
749 if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) &&
750 atomic_read(&dquot->dq_count) == 1)
751 wake_up(&dquot->dq_wait_unused);
752 spin_unlock(&dq_list_lock);
755 /* Need to release dquot? */
756 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
757 spin_unlock(&dq_list_lock);
758 /* Commit dquot before releasing */
759 ret = dquot->dq_sb->dq_op->write_dquot(dquot);
761 quota_error(dquot->dq_sb, "Can't write quota structure"
762 " (error %d). Quota may get out of sync!",
765 * We clear dirty bit anyway, so that we avoid
768 spin_lock(&dq_list_lock);
769 clear_dquot_dirty(dquot);
770 spin_unlock(&dq_list_lock);
774 /* Clear flag in case dquot was inactive (something bad happened) */
775 clear_dquot_dirty(dquot);
776 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
777 spin_unlock(&dq_list_lock);
778 dquot->dq_sb->dq_op->release_dquot(dquot);
781 atomic_dec(&dquot->dq_count);
782 #ifdef CONFIG_QUOTA_DEBUG
784 BUG_ON(!list_empty(&dquot->dq_free));
786 put_dquot_last(dquot);
787 spin_unlock(&dq_list_lock);
789 EXPORT_SYMBOL(dqput);
791 struct dquot *dquot_alloc(struct super_block *sb, int type)
793 return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
795 EXPORT_SYMBOL(dquot_alloc);
797 static struct dquot *get_empty_dquot(struct super_block *sb, int type)
801 dquot = sb->dq_op->alloc_dquot(sb, type);
805 mutex_init(&dquot->dq_lock);
806 INIT_LIST_HEAD(&dquot->dq_free);
807 INIT_LIST_HEAD(&dquot->dq_inuse);
808 INIT_HLIST_NODE(&dquot->dq_hash);
809 INIT_LIST_HEAD(&dquot->dq_dirty);
810 init_waitqueue_head(&dquot->dq_wait_unused);
812 dquot->dq_id = make_kqid_invalid(type);
813 atomic_set(&dquot->dq_count, 1);
819 * Get reference to dquot
821 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
822 * destroying our dquot by:
823 * a) checking for quota flags under dq_list_lock and
824 * b) getting a reference to dquot before we release dq_list_lock
826 struct dquot *dqget(struct super_block *sb, struct kqid qid)
828 unsigned int hashent = hashfn(sb, qid);
829 struct dquot *dquot = NULL, *empty = NULL;
831 if (!sb_has_quota_active(sb, qid.type))
834 spin_lock(&dq_list_lock);
835 spin_lock(&dq_state_lock);
836 if (!sb_has_quota_active(sb, qid.type)) {
837 spin_unlock(&dq_state_lock);
838 spin_unlock(&dq_list_lock);
841 spin_unlock(&dq_state_lock);
843 dquot = find_dquot(hashent, sb, qid);
846 spin_unlock(&dq_list_lock);
847 empty = get_empty_dquot(sb, qid.type);
849 schedule(); /* Try to wait for a moment... */
855 /* all dquots go on the inuse_list */
857 /* hash it first so it can be found */
858 insert_dquot_hash(dquot);
859 spin_unlock(&dq_list_lock);
860 dqstats_inc(DQST_LOOKUPS);
862 if (!atomic_read(&dquot->dq_count))
863 remove_free_dquot(dquot);
864 atomic_inc(&dquot->dq_count);
865 spin_unlock(&dq_list_lock);
866 dqstats_inc(DQST_CACHE_HITS);
867 dqstats_inc(DQST_LOOKUPS);
869 /* Wait for dq_lock - after this we know that either dquot_release() is
870 * already finished or it will be canceled due to dq_count > 1 test */
871 wait_on_dquot(dquot);
872 /* Read the dquot / allocate space in quota file */
873 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) &&
874 sb->dq_op->acquire_dquot(dquot) < 0) {
879 #ifdef CONFIG_QUOTA_DEBUG
880 BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
884 do_destroy_dquot(empty);
888 EXPORT_SYMBOL(dqget);
890 static int dqinit_needed(struct inode *inode, int type)
894 if (IS_NOQUOTA(inode))
897 return !inode->i_dquot[type];
898 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
899 if (!inode->i_dquot[cnt])
904 /* This routine is guarded by dqonoff_mutex mutex */
905 static void add_dquot_ref(struct super_block *sb, int type)
907 struct inode *inode, *old_inode = NULL;
908 #ifdef CONFIG_QUOTA_DEBUG
912 spin_lock(&inode_sb_list_lock);
913 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
914 spin_lock(&inode->i_lock);
915 if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
916 !atomic_read(&inode->i_writecount) ||
917 !dqinit_needed(inode, type)) {
918 spin_unlock(&inode->i_lock);
922 spin_unlock(&inode->i_lock);
923 spin_unlock(&inode_sb_list_lock);
925 #ifdef CONFIG_QUOTA_DEBUG
926 if (unlikely(inode_get_rsv_space(inode) > 0))
930 __dquot_initialize(inode, type);
933 * We hold a reference to 'inode' so it couldn't have been
934 * removed from s_inodes list while we dropped the
935 * inode_sb_list_lock We cannot iput the inode now as we can be
936 * holding the last reference and we cannot iput it under
937 * inode_sb_list_lock. So we keep the reference and iput it
941 spin_lock(&inode_sb_list_lock);
943 spin_unlock(&inode_sb_list_lock);
946 #ifdef CONFIG_QUOTA_DEBUG
948 quota_error(sb, "Writes happened before quota was turned on "
949 "thus quota information is probably inconsistent. "
950 "Please run quotacheck(8)");
956 * Return 0 if dqput() won't block.
957 * (note that 1 doesn't necessarily mean blocking)
959 static inline int dqput_blocks(struct dquot *dquot)
961 if (atomic_read(&dquot->dq_count) <= 1)
967 * Remove references to dquots from inode and add dquot to list for freeing
968 * if we have the last reference to dquot
969 * We can't race with anybody because we hold dqptr_sem for writing...
971 static int remove_inode_dquot_ref(struct inode *inode, int type,
972 struct list_head *tofree_head)
974 struct dquot *dquot = inode->i_dquot[type];
976 inode->i_dquot[type] = NULL;
978 if (dqput_blocks(dquot)) {
979 #ifdef CONFIG_QUOTA_DEBUG
980 if (atomic_read(&dquot->dq_count) != 1)
981 quota_error(inode->i_sb, "Adding dquot with "
982 "dq_count %d to dispose list",
983 atomic_read(&dquot->dq_count));
985 spin_lock(&dq_list_lock);
986 /* As dquot must have currently users it can't be on
987 * the free list... */
988 list_add(&dquot->dq_free, tofree_head);
989 spin_unlock(&dq_list_lock);
993 dqput(dquot); /* We have guaranteed we won't block */
999 * Free list of dquots
1000 * Dquots are removed from inodes and no new references can be got so we are
1001 * the only ones holding reference
1003 static void put_dquot_list(struct list_head *tofree_head)
1005 struct list_head *act_head;
1006 struct dquot *dquot;
1008 act_head = tofree_head->next;
1009 while (act_head != tofree_head) {
1010 dquot = list_entry(act_head, struct dquot, dq_free);
1011 act_head = act_head->next;
1012 /* Remove dquot from the list so we won't have problems... */
1013 list_del_init(&dquot->dq_free);
1018 static void remove_dquot_ref(struct super_block *sb, int type,
1019 struct list_head *tofree_head)
1021 struct inode *inode;
1024 spin_lock(&inode_sb_list_lock);
1025 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
1027 * We have to scan also I_NEW inodes because they can already
1028 * have quota pointer initialized. Luckily, we need to touch
1029 * only quota pointers and these have separate locking
1032 if (!IS_NOQUOTA(inode)) {
1033 if (unlikely(inode_get_rsv_space(inode) > 0))
1035 remove_inode_dquot_ref(inode, type, tofree_head);
1038 spin_unlock(&inode_sb_list_lock);
1039 #ifdef CONFIG_QUOTA_DEBUG
1041 printk(KERN_WARNING "VFS (%s): Writes happened after quota"
1042 " was disabled thus quota information is probably "
1043 "inconsistent. Please run quotacheck(8).\n", sb->s_id);
1048 /* Gather all references from inodes and drop them */
1049 static void drop_dquot_ref(struct super_block *sb, int type)
1051 LIST_HEAD(tofree_head);
1054 down_write(&sb_dqopt(sb)->dqptr_sem);
1055 remove_dquot_ref(sb, type, &tofree_head);
1056 up_write(&sb_dqopt(sb)->dqptr_sem);
1057 put_dquot_list(&tofree_head);
1061 static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
1063 dquot->dq_dqb.dqb_curinodes += number;
1066 static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
1068 dquot->dq_dqb.dqb_curspace += number;
1071 static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
1073 dquot->dq_dqb.dqb_rsvspace += number;
1077 * Claim reserved quota space
1079 static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number)
1081 if (dquot->dq_dqb.dqb_rsvspace < number) {
1083 number = dquot->dq_dqb.dqb_rsvspace;
1085 dquot->dq_dqb.dqb_curspace += number;
1086 dquot->dq_dqb.dqb_rsvspace -= number;
1090 void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
1092 if (dquot->dq_dqb.dqb_rsvspace >= number)
1093 dquot->dq_dqb.dqb_rsvspace -= number;
1096 dquot->dq_dqb.dqb_rsvspace = 0;
1100 static void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
1102 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
1103 dquot->dq_dqb.dqb_curinodes >= number)
1104 dquot->dq_dqb.dqb_curinodes -= number;
1106 dquot->dq_dqb.dqb_curinodes = 0;
1107 if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
1108 dquot->dq_dqb.dqb_itime = (time_t) 0;
1109 clear_bit(DQ_INODES_B, &dquot->dq_flags);
1112 static void dquot_decr_space(struct dquot *dquot, qsize_t number)
1114 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
1115 dquot->dq_dqb.dqb_curspace >= number)
1116 dquot->dq_dqb.dqb_curspace -= number;
1118 dquot->dq_dqb.dqb_curspace = 0;
1119 if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
1120 dquot->dq_dqb.dqb_btime = (time_t) 0;
1121 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
1125 struct super_block *w_sb;
1126 struct kqid w_dq_id;
1130 static int warning_issued(struct dquot *dquot, const int warntype)
1132 int flag = (warntype == QUOTA_NL_BHARDWARN ||
1133 warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
1134 ((warntype == QUOTA_NL_IHARDWARN ||
1135 warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
1139 return test_and_set_bit(flag, &dquot->dq_flags);
1142 #ifdef CONFIG_PRINT_QUOTA_WARNING
1143 static int flag_print_warnings = 1;
1145 static int need_print_warning(struct dquot_warn *warn)
1147 if (!flag_print_warnings)
1150 switch (warn->w_dq_id.type) {
1152 return uid_eq(current_fsuid(), warn->w_dq_id.uid);
1154 return in_group_p(warn->w_dq_id.gid);
1155 case PRJQUOTA: /* Never taken... Just make gcc happy */
1161 /* Print warning to user which exceeded quota */
1162 static void print_warning(struct dquot_warn *warn)
1165 struct tty_struct *tty;
1166 int warntype = warn->w_type;
1168 if (warntype == QUOTA_NL_IHARDBELOW ||
1169 warntype == QUOTA_NL_ISOFTBELOW ||
1170 warntype == QUOTA_NL_BHARDBELOW ||
1171 warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn))
1174 tty = get_current_tty();
1177 tty_write_message(tty, warn->w_sb->s_id);
1178 if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
1179 tty_write_message(tty, ": warning, ");
1181 tty_write_message(tty, ": write failed, ");
1182 tty_write_message(tty, quotatypes[warn->w_dq_id.type]);
1184 case QUOTA_NL_IHARDWARN:
1185 msg = " file limit reached.\r\n";
1187 case QUOTA_NL_ISOFTLONGWARN:
1188 msg = " file quota exceeded too long.\r\n";
1190 case QUOTA_NL_ISOFTWARN:
1191 msg = " file quota exceeded.\r\n";
1193 case QUOTA_NL_BHARDWARN:
1194 msg = " block limit reached.\r\n";
1196 case QUOTA_NL_BSOFTLONGWARN:
1197 msg = " block quota exceeded too long.\r\n";
1199 case QUOTA_NL_BSOFTWARN:
1200 msg = " block quota exceeded.\r\n";
1203 tty_write_message(tty, msg);
1208 static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot,
1211 if (warning_issued(dquot, warntype))
1213 warn->w_type = warntype;
1214 warn->w_sb = dquot->dq_sb;
1215 warn->w_dq_id = dquot->dq_id;
1219 * Write warnings to the console and send warning messages over netlink.
1221 * Note that this function can call into tty and networking code.
1223 static void flush_warnings(struct dquot_warn *warn)
1227 for (i = 0; i < MAXQUOTAS; i++) {
1228 if (warn[i].w_type == QUOTA_NL_NOWARN)
1230 #ifdef CONFIG_PRINT_QUOTA_WARNING
1231 print_warning(&warn[i]);
1233 quota_send_warning(warn[i].w_dq_id,
1234 warn[i].w_sb->s_dev, warn[i].w_type);
1238 static int ignore_hardlimit(struct dquot *dquot)
1240 struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type];
1242 return capable(CAP_SYS_RESOURCE) &&
1243 (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD ||
1244 !(info->dqi_flags & V1_DQF_RSQUASH));
1247 /* needs dq_data_lock */
1248 static int check_idq(struct dquot *dquot, qsize_t inodes,
1249 struct dquot_warn *warn)
1251 qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes;
1253 if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) ||
1254 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1257 if (dquot->dq_dqb.dqb_ihardlimit &&
1258 newinodes > dquot->dq_dqb.dqb_ihardlimit &&
1259 !ignore_hardlimit(dquot)) {
1260 prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN);
1264 if (dquot->dq_dqb.dqb_isoftlimit &&
1265 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1266 dquot->dq_dqb.dqb_itime &&
1267 get_seconds() >= dquot->dq_dqb.dqb_itime &&
1268 !ignore_hardlimit(dquot)) {
1269 prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN);
1273 if (dquot->dq_dqb.dqb_isoftlimit &&
1274 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1275 dquot->dq_dqb.dqb_itime == 0) {
1276 prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN);
1277 dquot->dq_dqb.dqb_itime = get_seconds() +
1278 sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace;
1284 /* needs dq_data_lock */
1285 static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc,
1286 struct dquot_warn *warn)
1289 struct super_block *sb = dquot->dq_sb;
1291 if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) ||
1292 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1295 tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace
1298 if (dquot->dq_dqb.dqb_bhardlimit &&
1299 tspace > dquot->dq_dqb.dqb_bhardlimit &&
1300 !ignore_hardlimit(dquot)) {
1302 prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN);
1306 if (dquot->dq_dqb.dqb_bsoftlimit &&
1307 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
1308 dquot->dq_dqb.dqb_btime &&
1309 get_seconds() >= dquot->dq_dqb.dqb_btime &&
1310 !ignore_hardlimit(dquot)) {
1312 prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN);
1316 if (dquot->dq_dqb.dqb_bsoftlimit &&
1317 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
1318 dquot->dq_dqb.dqb_btime == 0) {
1320 prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN);
1321 dquot->dq_dqb.dqb_btime = get_seconds() +
1322 sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace;
1326 * We don't allow preallocation to exceed softlimit so exceeding will
1335 static int info_idq_free(struct dquot *dquot, qsize_t inodes)
1339 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1340 dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit ||
1341 !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type))
1342 return QUOTA_NL_NOWARN;
1344 newinodes = dquot->dq_dqb.dqb_curinodes - inodes;
1345 if (newinodes <= dquot->dq_dqb.dqb_isoftlimit)
1346 return QUOTA_NL_ISOFTBELOW;
1347 if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
1348 newinodes < dquot->dq_dqb.dqb_ihardlimit)
1349 return QUOTA_NL_IHARDBELOW;
1350 return QUOTA_NL_NOWARN;
1353 static int info_bdq_free(struct dquot *dquot, qsize_t space)
1355 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1356 dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
1357 return QUOTA_NL_NOWARN;
1359 if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit)
1360 return QUOTA_NL_BSOFTBELOW;
1361 if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit &&
1362 dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit)
1363 return QUOTA_NL_BHARDBELOW;
1364 return QUOTA_NL_NOWARN;
1367 static int dquot_active(const struct inode *inode)
1369 struct super_block *sb = inode->i_sb;
1371 if (IS_NOQUOTA(inode))
1373 return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb);
1377 * Initialize quota pointers in inode
1379 * We do things in a bit complicated way but by that we avoid calling
1380 * dqget() and thus filesystem callbacks under dqptr_sem.
1382 * It is better to call this function outside of any transaction as it
1383 * might need a lot of space in journal for dquot structure allocation.
1385 static void __dquot_initialize(struct inode *inode, int type)
1388 struct dquot *got[MAXQUOTAS];
1389 struct super_block *sb = inode->i_sb;
1392 /* First test before acquiring mutex - solves deadlocks when we
1393 * re-enter the quota code and are already holding the mutex */
1394 if (!dquot_active(inode))
1397 /* First get references to structures we might need. */
1398 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1401 if (type != -1 && cnt != type)
1405 qid = make_kqid_uid(inode->i_uid);
1408 qid = make_kqid_gid(inode->i_gid);
1411 got[cnt] = dqget(sb, qid);
1414 down_write(&sb_dqopt(sb)->dqptr_sem);
1415 if (IS_NOQUOTA(inode))
1417 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1418 if (type != -1 && cnt != type)
1420 /* Avoid races with quotaoff() */
1421 if (!sb_has_quota_active(sb, cnt))
1423 /* We could race with quotaon or dqget() could have failed */
1426 if (!inode->i_dquot[cnt]) {
1427 inode->i_dquot[cnt] = got[cnt];
1430 * Make quota reservation system happy if someone
1431 * did a write before quota was turned on
1433 rsv = inode_get_rsv_space(inode);
1434 if (unlikely(rsv)) {
1435 spin_lock(&dq_data_lock);
1436 dquot_resv_space(inode->i_dquot[cnt], rsv);
1437 spin_unlock(&dq_data_lock);
1442 up_write(&sb_dqopt(sb)->dqptr_sem);
1443 /* Drop unused references */
1447 void dquot_initialize(struct inode *inode)
1449 __dquot_initialize(inode, -1);
1451 EXPORT_SYMBOL(dquot_initialize);
1454 * Release all quotas referenced by inode
1456 static void __dquot_drop(struct inode *inode)
1459 struct dquot *put[MAXQUOTAS];
1461 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1462 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1463 put[cnt] = inode->i_dquot[cnt];
1464 inode->i_dquot[cnt] = NULL;
1466 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1470 void dquot_drop(struct inode *inode)
1474 if (IS_NOQUOTA(inode))
1478 * Test before calling to rule out calls from proc and such
1479 * where we are not allowed to block. Note that this is
1480 * actually reliable test even without the lock - the caller
1481 * must assure that nobody can come after the DQUOT_DROP and
1482 * add quota pointers back anyway.
1484 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1485 if (inode->i_dquot[cnt])
1489 if (cnt < MAXQUOTAS)
1490 __dquot_drop(inode);
1492 EXPORT_SYMBOL(dquot_drop);
1495 * inode_reserved_space is managed internally by quota, and protected by
1496 * i_lock similar to i_blocks+i_bytes.
1498 static qsize_t *inode_reserved_space(struct inode * inode)
1500 /* Filesystem must explicitly define it's own method in order to use
1501 * quota reservation interface */
1502 BUG_ON(!inode->i_sb->dq_op->get_reserved_space);
1503 return inode->i_sb->dq_op->get_reserved_space(inode);
1506 void inode_add_rsv_space(struct inode *inode, qsize_t number)
1508 spin_lock(&inode->i_lock);
1509 *inode_reserved_space(inode) += number;
1510 spin_unlock(&inode->i_lock);
1512 EXPORT_SYMBOL(inode_add_rsv_space);
1514 void inode_claim_rsv_space(struct inode *inode, qsize_t number)
1516 spin_lock(&inode->i_lock);
1517 *inode_reserved_space(inode) -= number;
1518 __inode_add_bytes(inode, number);
1519 spin_unlock(&inode->i_lock);
1521 EXPORT_SYMBOL(inode_claim_rsv_space);
1523 void inode_sub_rsv_space(struct inode *inode, qsize_t number)
1525 spin_lock(&inode->i_lock);
1526 *inode_reserved_space(inode) -= number;
1527 spin_unlock(&inode->i_lock);
1529 EXPORT_SYMBOL(inode_sub_rsv_space);
1531 static qsize_t inode_get_rsv_space(struct inode *inode)
1535 if (!inode->i_sb->dq_op->get_reserved_space)
1537 spin_lock(&inode->i_lock);
1538 ret = *inode_reserved_space(inode);
1539 spin_unlock(&inode->i_lock);
1543 static void inode_incr_space(struct inode *inode, qsize_t number,
1547 inode_add_rsv_space(inode, number);
1549 inode_add_bytes(inode, number);
1552 static void inode_decr_space(struct inode *inode, qsize_t number, int reserve)
1555 inode_sub_rsv_space(inode, number);
1557 inode_sub_bytes(inode, number);
1561 * This functions updates i_blocks+i_bytes fields and quota information
1562 * (together with appropriate checks).
1564 * NOTE: We absolutely rely on the fact that caller dirties the inode
1565 * (usually helpers in quotaops.h care about this) and holds a handle for
1566 * the current transaction so that dquot write and inode write go into the
1571 * This operation can block, but only after everything is updated
1573 int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags)
1576 struct dquot_warn warn[MAXQUOTAS];
1577 struct dquot **dquots = inode->i_dquot;
1578 int reserve = flags & DQUOT_SPACE_RESERVE;
1581 * First test before acquiring mutex - solves deadlocks when we
1582 * re-enter the quota code and are already holding the mutex
1584 if (!dquot_active(inode)) {
1585 inode_incr_space(inode, number, reserve);
1589 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1590 warn[cnt].w_type = QUOTA_NL_NOWARN;
1592 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1593 spin_lock(&dq_data_lock);
1594 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1597 ret = check_bdq(dquots[cnt], number,
1598 !(flags & DQUOT_SPACE_WARN), &warn[cnt]);
1599 if (ret && !(flags & DQUOT_SPACE_NOFAIL)) {
1600 spin_unlock(&dq_data_lock);
1601 goto out_flush_warn;
1604 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1608 dquot_resv_space(dquots[cnt], number);
1610 dquot_incr_space(dquots[cnt], number);
1612 inode_incr_space(inode, number, reserve);
1613 spin_unlock(&dq_data_lock);
1616 goto out_flush_warn;
1617 mark_all_dquot_dirty(dquots);
1619 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1620 flush_warnings(warn);
1624 EXPORT_SYMBOL(__dquot_alloc_space);
1627 * This operation can block, but only after everything is updated
1629 int dquot_alloc_inode(const struct inode *inode)
1632 struct dquot_warn warn[MAXQUOTAS];
1633 struct dquot * const *dquots = inode->i_dquot;
1635 /* First test before acquiring mutex - solves deadlocks when we
1636 * re-enter the quota code and are already holding the mutex */
1637 if (!dquot_active(inode))
1639 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1640 warn[cnt].w_type = QUOTA_NL_NOWARN;
1641 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1642 spin_lock(&dq_data_lock);
1643 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1646 ret = check_idq(dquots[cnt], 1, &warn[cnt]);
1651 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1654 dquot_incr_inodes(dquots[cnt], 1);
1658 spin_unlock(&dq_data_lock);
1660 mark_all_dquot_dirty(dquots);
1661 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1662 flush_warnings(warn);
1665 EXPORT_SYMBOL(dquot_alloc_inode);
1668 * Convert in-memory reserved quotas to real consumed quotas
1670 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
1674 if (!dquot_active(inode)) {
1675 inode_claim_rsv_space(inode, number);
1679 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1680 spin_lock(&dq_data_lock);
1681 /* Claim reserved quotas to allocated quotas */
1682 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1683 if (inode->i_dquot[cnt])
1684 dquot_claim_reserved_space(inode->i_dquot[cnt],
1687 /* Update inode bytes */
1688 inode_claim_rsv_space(inode, number);
1689 spin_unlock(&dq_data_lock);
1690 mark_all_dquot_dirty(inode->i_dquot);
1691 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1694 EXPORT_SYMBOL(dquot_claim_space_nodirty);
1697 * This operation can block, but only after everything is updated
1699 void __dquot_free_space(struct inode *inode, qsize_t number, int flags)
1702 struct dquot_warn warn[MAXQUOTAS];
1703 struct dquot **dquots = inode->i_dquot;
1704 int reserve = flags & DQUOT_SPACE_RESERVE;
1706 /* First test before acquiring mutex - solves deadlocks when we
1707 * re-enter the quota code and are already holding the mutex */
1708 if (!dquot_active(inode)) {
1709 inode_decr_space(inode, number, reserve);
1713 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1714 spin_lock(&dq_data_lock);
1715 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1718 warn[cnt].w_type = QUOTA_NL_NOWARN;
1721 wtype = info_bdq_free(dquots[cnt], number);
1722 if (wtype != QUOTA_NL_NOWARN)
1723 prepare_warning(&warn[cnt], dquots[cnt], wtype);
1725 dquot_free_reserved_space(dquots[cnt], number);
1727 dquot_decr_space(dquots[cnt], number);
1729 inode_decr_space(inode, number, reserve);
1730 spin_unlock(&dq_data_lock);
1734 mark_all_dquot_dirty(dquots);
1736 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1737 flush_warnings(warn);
1739 EXPORT_SYMBOL(__dquot_free_space);
1742 * This operation can block, but only after everything is updated
1744 void dquot_free_inode(const struct inode *inode)
1747 struct dquot_warn warn[MAXQUOTAS];
1748 struct dquot * const *dquots = inode->i_dquot;
1750 /* First test before acquiring mutex - solves deadlocks when we
1751 * re-enter the quota code and are already holding the mutex */
1752 if (!dquot_active(inode))
1755 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1756 spin_lock(&dq_data_lock);
1757 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1760 warn[cnt].w_type = QUOTA_NL_NOWARN;
1763 wtype = info_idq_free(dquots[cnt], 1);
1764 if (wtype != QUOTA_NL_NOWARN)
1765 prepare_warning(&warn[cnt], dquots[cnt], wtype);
1766 dquot_decr_inodes(dquots[cnt], 1);
1768 spin_unlock(&dq_data_lock);
1769 mark_all_dquot_dirty(dquots);
1770 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1771 flush_warnings(warn);
1773 EXPORT_SYMBOL(dquot_free_inode);
1776 * Transfer the number of inode and blocks from one diskquota to an other.
1777 * On success, dquot references in transfer_to are consumed and references
1778 * to original dquots that need to be released are placed there. On failure,
1779 * references are kept untouched.
1781 * This operation can block, but only after everything is updated
1782 * A transaction must be started when entering this function.
1785 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to)
1787 qsize_t space, cur_space;
1788 qsize_t rsv_space = 0;
1789 struct dquot *transfer_from[MAXQUOTAS] = {};
1791 char is_valid[MAXQUOTAS] = {};
1792 struct dquot_warn warn_to[MAXQUOTAS];
1793 struct dquot_warn warn_from_inodes[MAXQUOTAS];
1794 struct dquot_warn warn_from_space[MAXQUOTAS];
1796 /* First test before acquiring mutex - solves deadlocks when we
1797 * re-enter the quota code and are already holding the mutex */
1798 if (IS_NOQUOTA(inode))
1800 /* Initialize the arrays */
1801 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1802 warn_to[cnt].w_type = QUOTA_NL_NOWARN;
1803 warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN;
1804 warn_from_space[cnt].w_type = QUOTA_NL_NOWARN;
1806 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1807 if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
1808 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1811 spin_lock(&dq_data_lock);
1812 cur_space = inode_get_bytes(inode);
1813 rsv_space = inode_get_rsv_space(inode);
1814 space = cur_space + rsv_space;
1815 /* Build the transfer_from list and check the limits */
1816 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1818 * Skip changes for same uid or gid or for turned off quota-type.
1820 if (!transfer_to[cnt])
1822 /* Avoid races with quotaoff() */
1823 if (!sb_has_quota_active(inode->i_sb, cnt))
1826 transfer_from[cnt] = inode->i_dquot[cnt];
1827 ret = check_idq(transfer_to[cnt], 1, &warn_to[cnt]);
1830 ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]);
1836 * Finally perform the needed transfer from transfer_from to transfer_to
1838 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1841 /* Due to IO error we might not have transfer_from[] structure */
1842 if (transfer_from[cnt]) {
1844 wtype = info_idq_free(transfer_from[cnt], 1);
1845 if (wtype != QUOTA_NL_NOWARN)
1846 prepare_warning(&warn_from_inodes[cnt],
1847 transfer_from[cnt], wtype);
1848 wtype = info_bdq_free(transfer_from[cnt], space);
1849 if (wtype != QUOTA_NL_NOWARN)
1850 prepare_warning(&warn_from_space[cnt],
1851 transfer_from[cnt], wtype);
1852 dquot_decr_inodes(transfer_from[cnt], 1);
1853 dquot_decr_space(transfer_from[cnt], cur_space);
1854 dquot_free_reserved_space(transfer_from[cnt],
1858 dquot_incr_inodes(transfer_to[cnt], 1);
1859 dquot_incr_space(transfer_to[cnt], cur_space);
1860 dquot_resv_space(transfer_to[cnt], rsv_space);
1862 inode->i_dquot[cnt] = transfer_to[cnt];
1864 spin_unlock(&dq_data_lock);
1865 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1867 mark_all_dquot_dirty(transfer_from);
1868 mark_all_dquot_dirty(transfer_to);
1869 flush_warnings(warn_to);
1870 flush_warnings(warn_from_inodes);
1871 flush_warnings(warn_from_space);
1872 /* Pass back references to put */
1873 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1875 transfer_to[cnt] = transfer_from[cnt];
1878 spin_unlock(&dq_data_lock);
1879 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1880 flush_warnings(warn_to);
1883 EXPORT_SYMBOL(__dquot_transfer);
1885 /* Wrapper for transferring ownership of an inode for uid/gid only
1886 * Called from FSXXX_setattr()
1888 int dquot_transfer(struct inode *inode, struct iattr *iattr)
1890 struct dquot *transfer_to[MAXQUOTAS] = {};
1891 struct super_block *sb = inode->i_sb;
1894 if (!dquot_active(inode))
1897 if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid))
1898 transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(iattr->ia_uid));
1899 if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))
1900 transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(iattr->ia_gid));
1902 ret = __dquot_transfer(inode, transfer_to);
1903 dqput_all(transfer_to);
1906 EXPORT_SYMBOL(dquot_transfer);
1909 * Write info of quota file to disk
1911 int dquot_commit_info(struct super_block *sb, int type)
1914 struct quota_info *dqopt = sb_dqopt(sb);
1916 mutex_lock(&dqopt->dqio_mutex);
1917 ret = dqopt->ops[type]->write_file_info(sb, type);
1918 mutex_unlock(&dqopt->dqio_mutex);
1921 EXPORT_SYMBOL(dquot_commit_info);
1924 * Definitions of diskquota operations.
1926 const struct dquot_operations dquot_operations = {
1927 .write_dquot = dquot_commit,
1928 .acquire_dquot = dquot_acquire,
1929 .release_dquot = dquot_release,
1930 .mark_dirty = dquot_mark_dquot_dirty,
1931 .write_info = dquot_commit_info,
1932 .alloc_dquot = dquot_alloc,
1933 .destroy_dquot = dquot_destroy,
1935 EXPORT_SYMBOL(dquot_operations);
1938 * Generic helper for ->open on filesystems supporting disk quotas.
1940 int dquot_file_open(struct inode *inode, struct file *file)
1944 error = generic_file_open(inode, file);
1945 if (!error && (file->f_mode & FMODE_WRITE))
1946 dquot_initialize(inode);
1949 EXPORT_SYMBOL(dquot_file_open);
1952 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1954 int dquot_disable(struct super_block *sb, int type, unsigned int flags)
1957 struct quota_info *dqopt = sb_dqopt(sb);
1958 struct inode *toputinode[MAXQUOTAS];
1960 /* Cannot turn off usage accounting without turning off limits, or
1961 * suspend quotas and simultaneously turn quotas off. */
1962 if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED))
1963 || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED |
1964 DQUOT_USAGE_ENABLED)))
1967 /* We need to serialize quota_off() for device */
1968 mutex_lock(&dqopt->dqonoff_mutex);
1971 * Skip everything if there's nothing to do. We have to do this because
1972 * sometimes we are called when fill_super() failed and calling
1973 * sync_fs() in such cases does no good.
1975 if (!sb_any_quota_loaded(sb)) {
1976 mutex_unlock(&dqopt->dqonoff_mutex);
1979 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1980 toputinode[cnt] = NULL;
1981 if (type != -1 && cnt != type)
1983 if (!sb_has_quota_loaded(sb, cnt))
1986 if (flags & DQUOT_SUSPENDED) {
1987 spin_lock(&dq_state_lock);
1989 dquot_state_flag(DQUOT_SUSPENDED, cnt);
1990 spin_unlock(&dq_state_lock);
1992 spin_lock(&dq_state_lock);
1993 dqopt->flags &= ~dquot_state_flag(flags, cnt);
1994 /* Turning off suspended quotas? */
1995 if (!sb_has_quota_loaded(sb, cnt) &&
1996 sb_has_quota_suspended(sb, cnt)) {
1997 dqopt->flags &= ~dquot_state_flag(
1998 DQUOT_SUSPENDED, cnt);
1999 spin_unlock(&dq_state_lock);
2000 iput(dqopt->files[cnt]);
2001 dqopt->files[cnt] = NULL;
2004 spin_unlock(&dq_state_lock);
2007 /* We still have to keep quota loaded? */
2008 if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED))
2011 /* Note: these are blocking operations */
2012 drop_dquot_ref(sb, cnt);
2013 invalidate_dquots(sb, cnt);
2015 * Now all dquots should be invalidated, all writes done so we
2016 * should be only users of the info. No locks needed.
2018 if (info_dirty(&dqopt->info[cnt]))
2019 sb->dq_op->write_info(sb, cnt);
2020 if (dqopt->ops[cnt]->free_file_info)
2021 dqopt->ops[cnt]->free_file_info(sb, cnt);
2022 put_quota_format(dqopt->info[cnt].dqi_format);
2024 toputinode[cnt] = dqopt->files[cnt];
2025 if (!sb_has_quota_loaded(sb, cnt))
2026 dqopt->files[cnt] = NULL;
2027 dqopt->info[cnt].dqi_flags = 0;
2028 dqopt->info[cnt].dqi_igrace = 0;
2029 dqopt->info[cnt].dqi_bgrace = 0;
2030 dqopt->ops[cnt] = NULL;
2032 mutex_unlock(&dqopt->dqonoff_mutex);
2034 /* Skip syncing and setting flags if quota files are hidden */
2035 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
2038 /* Sync the superblock so that buffers with quota data are written to
2039 * disk (and so userspace sees correct data afterwards). */
2040 if (sb->s_op->sync_fs)
2041 sb->s_op->sync_fs(sb, 1);
2042 sync_blockdev(sb->s_bdev);
2043 /* Now the quota files are just ordinary files and we can set the
2044 * inode flags back. Moreover we discard the pagecache so that
2045 * userspace sees the writes we did bypassing the pagecache. We
2046 * must also discard the blockdev buffers so that we see the
2047 * changes done by userspace on the next quotaon() */
2048 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
2049 if (toputinode[cnt]) {
2050 mutex_lock(&dqopt->dqonoff_mutex);
2051 /* If quota was reenabled in the meantime, we have
2053 if (!sb_has_quota_loaded(sb, cnt)) {
2054 mutex_lock(&toputinode[cnt]->i_mutex);
2055 toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
2056 S_NOATIME | S_NOQUOTA);
2057 truncate_inode_pages(&toputinode[cnt]->i_data,
2059 mutex_unlock(&toputinode[cnt]->i_mutex);
2060 mark_inode_dirty_sync(toputinode[cnt]);
2062 mutex_unlock(&dqopt->dqonoff_mutex);
2065 invalidate_bdev(sb->s_bdev);
2067 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
2068 if (toputinode[cnt]) {
2069 /* On remount RO, we keep the inode pointer so that we
2070 * can reenable quota on the subsequent remount RW. We
2071 * have to check 'flags' variable and not use sb_has_
2072 * function because another quotaon / quotaoff could
2073 * change global state before we got here. We refuse
2074 * to suspend quotas when there is pending delete on
2075 * the quota file... */
2076 if (!(flags & DQUOT_SUSPENDED))
2077 iput(toputinode[cnt]);
2078 else if (!toputinode[cnt]->i_nlink)
2083 EXPORT_SYMBOL(dquot_disable);
2085 int dquot_quota_off(struct super_block *sb, int type)
2087 return dquot_disable(sb, type,
2088 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
2090 EXPORT_SYMBOL(dquot_quota_off);
2093 * Turn quotas on on a device
2097 * Helper function to turn quotas on when we already have the inode of
2098 * quota file and no quota information is loaded.
2100 static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
2103 struct quota_format_type *fmt = find_quota_format(format_id);
2104 struct super_block *sb = inode->i_sb;
2105 struct quota_info *dqopt = sb_dqopt(sb);
2111 if (!S_ISREG(inode->i_mode)) {
2115 if (IS_RDONLY(inode)) {
2119 if (!sb->s_op->quota_write || !sb->s_op->quota_read) {
2123 /* Usage always has to be set... */
2124 if (!(flags & DQUOT_USAGE_ENABLED)) {
2129 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2130 /* As we bypass the pagecache we must now flush all the
2131 * dirty data and invalidate caches so that kernel sees
2132 * changes from userspace. It is not enough to just flush
2133 * the quota file since if blocksize < pagesize, invalidation
2134 * of the cache could fail because of other unrelated dirty
2136 sync_filesystem(sb);
2137 invalidate_bdev(sb->s_bdev);
2139 mutex_lock(&dqopt->dqonoff_mutex);
2140 if (sb_has_quota_loaded(sb, type)) {
2145 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2146 /* We don't want quota and atime on quota files (deadlocks
2147 * possible) Also nobody should write to the file - we use
2148 * special IO operations which ignore the immutable bit. */
2149 mutex_lock(&inode->i_mutex);
2150 oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE |
2152 inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
2153 mutex_unlock(&inode->i_mutex);
2155 * When S_NOQUOTA is set, remove dquot references as no more
2156 * references can be added
2158 __dquot_drop(inode);
2162 dqopt->files[type] = igrab(inode);
2163 if (!dqopt->files[type])
2166 if (!fmt->qf_ops->check_quota_file(sb, type))
2169 dqopt->ops[type] = fmt->qf_ops;
2170 dqopt->info[type].dqi_format = fmt;
2171 dqopt->info[type].dqi_fmt_id = format_id;
2172 INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
2173 mutex_lock(&dqopt->dqio_mutex);
2174 error = dqopt->ops[type]->read_file_info(sb, type);
2176 mutex_unlock(&dqopt->dqio_mutex);
2179 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
2180 dqopt->info[type].dqi_flags |= DQF_SYS_FILE;
2181 mutex_unlock(&dqopt->dqio_mutex);
2182 spin_lock(&dq_state_lock);
2183 dqopt->flags |= dquot_state_flag(flags, type);
2184 spin_unlock(&dq_state_lock);
2186 add_dquot_ref(sb, type);
2187 mutex_unlock(&dqopt->dqonoff_mutex);
2192 dqopt->files[type] = NULL;
2195 if (oldflags != -1) {
2196 mutex_lock(&inode->i_mutex);
2197 /* Set the flags back (in the case of accidental quotaon()
2198 * on a wrong file we don't want to mess up the flags) */
2199 inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
2200 inode->i_flags |= oldflags;
2201 mutex_unlock(&inode->i_mutex);
2203 mutex_unlock(&dqopt->dqonoff_mutex);
2205 put_quota_format(fmt);
2210 /* Reenable quotas on remount RW */
2211 int dquot_resume(struct super_block *sb, int type)
2213 struct quota_info *dqopt = sb_dqopt(sb);
2214 struct inode *inode;
2218 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
2219 if (type != -1 && cnt != type)
2222 mutex_lock(&dqopt->dqonoff_mutex);
2223 if (!sb_has_quota_suspended(sb, cnt)) {
2224 mutex_unlock(&dqopt->dqonoff_mutex);
2227 inode = dqopt->files[cnt];
2228 dqopt->files[cnt] = NULL;
2229 spin_lock(&dq_state_lock);
2230 flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
2231 DQUOT_LIMITS_ENABLED,
2233 dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt);
2234 spin_unlock(&dq_state_lock);
2235 mutex_unlock(&dqopt->dqonoff_mutex);
2237 flags = dquot_generic_flag(flags, cnt);
2238 ret = vfs_load_quota_inode(inode, cnt,
2239 dqopt->info[cnt].dqi_fmt_id, flags);
2245 EXPORT_SYMBOL(dquot_resume);
2247 int dquot_quota_on(struct super_block *sb, int type, int format_id,
2250 int error = security_quota_on(path->dentry);
2253 /* Quota file not on the same filesystem? */
2254 if (path->dentry->d_sb != sb)
2257 error = vfs_load_quota_inode(path->dentry->d_inode, type,
2258 format_id, DQUOT_USAGE_ENABLED |
2259 DQUOT_LIMITS_ENABLED);
2262 EXPORT_SYMBOL(dquot_quota_on);
2265 * More powerful function for turning on quotas allowing setting
2266 * of individual quota flags
2268 int dquot_enable(struct inode *inode, int type, int format_id,
2272 struct super_block *sb = inode->i_sb;
2273 struct quota_info *dqopt = sb_dqopt(sb);
2275 /* Just unsuspend quotas? */
2276 BUG_ON(flags & DQUOT_SUSPENDED);
2280 /* Just updating flags needed? */
2281 if (sb_has_quota_loaded(sb, type)) {
2282 mutex_lock(&dqopt->dqonoff_mutex);
2283 /* Now do a reliable test... */
2284 if (!sb_has_quota_loaded(sb, type)) {
2285 mutex_unlock(&dqopt->dqonoff_mutex);
2288 if (flags & DQUOT_USAGE_ENABLED &&
2289 sb_has_quota_usage_enabled(sb, type)) {
2293 if (flags & DQUOT_LIMITS_ENABLED &&
2294 sb_has_quota_limits_enabled(sb, type)) {
2298 spin_lock(&dq_state_lock);
2299 sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
2300 spin_unlock(&dq_state_lock);
2302 mutex_unlock(&dqopt->dqonoff_mutex);
2307 return vfs_load_quota_inode(inode, type, format_id, flags);
2309 EXPORT_SYMBOL(dquot_enable);
2312 * This function is used when filesystem needs to initialize quotas
2313 * during mount time.
2315 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
2316 int format_id, int type)
2318 struct dentry *dentry;
2321 mutex_lock(&sb->s_root->d_inode->i_mutex);
2322 dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
2323 mutex_unlock(&sb->s_root->d_inode->i_mutex);
2325 return PTR_ERR(dentry);
2327 if (!dentry->d_inode) {
2332 error = security_quota_on(dentry);
2334 error = vfs_load_quota_inode(dentry->d_inode, type, format_id,
2335 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
2341 EXPORT_SYMBOL(dquot_quota_on_mount);
2343 static inline qsize_t qbtos(qsize_t blocks)
2345 return blocks << QIF_DQBLKSIZE_BITS;
2348 static inline qsize_t stoqb(qsize_t space)
2350 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
2353 /* Generic routine for getting common part of quota structure */
2354 static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di)
2356 struct mem_dqblk *dm = &dquot->dq_dqb;
2358 memset(di, 0, sizeof(*di));
2359 di->d_version = FS_DQUOT_VERSION;
2360 di->d_flags = dquot->dq_id.type == USRQUOTA ?
2361 FS_USER_QUOTA : FS_GROUP_QUOTA;
2362 di->d_id = from_kqid_munged(current_user_ns(), dquot->dq_id);
2364 spin_lock(&dq_data_lock);
2365 di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit);
2366 di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit);
2367 di->d_ino_hardlimit = dm->dqb_ihardlimit;
2368 di->d_ino_softlimit = dm->dqb_isoftlimit;
2369 di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace;
2370 di->d_icount = dm->dqb_curinodes;
2371 di->d_btimer = dm->dqb_btime;
2372 di->d_itimer = dm->dqb_itime;
2373 spin_unlock(&dq_data_lock);
2376 int dquot_get_dqblk(struct super_block *sb, struct kqid qid,
2377 struct fs_disk_quota *di)
2379 struct dquot *dquot;
2381 dquot = dqget(sb, qid);
2384 do_get_dqblk(dquot, di);
2389 EXPORT_SYMBOL(dquot_get_dqblk);
2391 #define VFS_FS_DQ_MASK \
2392 (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \
2393 FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \
2394 FS_DQ_BTIMER | FS_DQ_ITIMER)
2396 /* Generic routine for setting common part of quota structure */
2397 static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *di)
2399 struct mem_dqblk *dm = &dquot->dq_dqb;
2400 int check_blim = 0, check_ilim = 0;
2401 struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type];
2403 if (di->d_fieldmask & ~VFS_FS_DQ_MASK)
2406 if (((di->d_fieldmask & FS_DQ_BSOFT) &&
2407 (di->d_blk_softlimit > dqi->dqi_maxblimit)) ||
2408 ((di->d_fieldmask & FS_DQ_BHARD) &&
2409 (di->d_blk_hardlimit > dqi->dqi_maxblimit)) ||
2410 ((di->d_fieldmask & FS_DQ_ISOFT) &&
2411 (di->d_ino_softlimit > dqi->dqi_maxilimit)) ||
2412 ((di->d_fieldmask & FS_DQ_IHARD) &&
2413 (di->d_ino_hardlimit > dqi->dqi_maxilimit)))
2416 spin_lock(&dq_data_lock);
2417 if (di->d_fieldmask & FS_DQ_BCOUNT) {
2418 dm->dqb_curspace = di->d_bcount - dm->dqb_rsvspace;
2420 set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
2423 if (di->d_fieldmask & FS_DQ_BSOFT)
2424 dm->dqb_bsoftlimit = qbtos(di->d_blk_softlimit);
2425 if (di->d_fieldmask & FS_DQ_BHARD)
2426 dm->dqb_bhardlimit = qbtos(di->d_blk_hardlimit);
2427 if (di->d_fieldmask & (FS_DQ_BSOFT | FS_DQ_BHARD)) {
2429 set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
2432 if (di->d_fieldmask & FS_DQ_ICOUNT) {
2433 dm->dqb_curinodes = di->d_icount;
2435 set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
2438 if (di->d_fieldmask & FS_DQ_ISOFT)
2439 dm->dqb_isoftlimit = di->d_ino_softlimit;
2440 if (di->d_fieldmask & FS_DQ_IHARD)
2441 dm->dqb_ihardlimit = di->d_ino_hardlimit;
2442 if (di->d_fieldmask & (FS_DQ_ISOFT | FS_DQ_IHARD)) {
2444 set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
2447 if (di->d_fieldmask & FS_DQ_BTIMER) {
2448 dm->dqb_btime = di->d_btimer;
2450 set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
2453 if (di->d_fieldmask & FS_DQ_ITIMER) {
2454 dm->dqb_itime = di->d_itimer;
2456 set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
2460 if (!dm->dqb_bsoftlimit ||
2461 dm->dqb_curspace < dm->dqb_bsoftlimit) {
2463 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
2464 } else if (!(di->d_fieldmask & FS_DQ_BTIMER))
2465 /* Set grace only if user hasn't provided his own... */
2466 dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
2469 if (!dm->dqb_isoftlimit ||
2470 dm->dqb_curinodes < dm->dqb_isoftlimit) {
2472 clear_bit(DQ_INODES_B, &dquot->dq_flags);
2473 } else if (!(di->d_fieldmask & FS_DQ_ITIMER))
2474 /* Set grace only if user hasn't provided his own... */
2475 dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
2477 if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit ||
2479 clear_bit(DQ_FAKE_B, &dquot->dq_flags);
2481 set_bit(DQ_FAKE_B, &dquot->dq_flags);
2482 spin_unlock(&dq_data_lock);
2483 mark_dquot_dirty(dquot);
2488 int dquot_set_dqblk(struct super_block *sb, struct kqid qid,
2489 struct fs_disk_quota *di)
2491 struct dquot *dquot;
2494 dquot = dqget(sb, qid);
2499 rc = do_set_dqblk(dquot, di);
2504 EXPORT_SYMBOL(dquot_set_dqblk);
2506 /* Generic routine for getting common part of quota file information */
2507 int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2509 struct mem_dqinfo *mi;
2511 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2512 if (!sb_has_quota_active(sb, type)) {
2513 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2516 mi = sb_dqopt(sb)->info + type;
2517 spin_lock(&dq_data_lock);
2518 ii->dqi_bgrace = mi->dqi_bgrace;
2519 ii->dqi_igrace = mi->dqi_igrace;
2520 ii->dqi_flags = mi->dqi_flags & DQF_GETINFO_MASK;
2521 ii->dqi_valid = IIF_ALL;
2522 spin_unlock(&dq_data_lock);
2523 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2526 EXPORT_SYMBOL(dquot_get_dqinfo);
2528 /* Generic routine for setting common part of quota file information */
2529 int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2531 struct mem_dqinfo *mi;
2534 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2535 if (!sb_has_quota_active(sb, type)) {
2539 mi = sb_dqopt(sb)->info + type;
2540 spin_lock(&dq_data_lock);
2541 if (ii->dqi_valid & IIF_BGRACE)
2542 mi->dqi_bgrace = ii->dqi_bgrace;
2543 if (ii->dqi_valid & IIF_IGRACE)
2544 mi->dqi_igrace = ii->dqi_igrace;
2545 if (ii->dqi_valid & IIF_FLAGS)
2546 mi->dqi_flags = (mi->dqi_flags & ~DQF_SETINFO_MASK) |
2547 (ii->dqi_flags & DQF_SETINFO_MASK);
2548 spin_unlock(&dq_data_lock);
2549 mark_info_dirty(sb, type);
2550 /* Force write to disk */
2551 sb->dq_op->write_info(sb, type);
2553 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2556 EXPORT_SYMBOL(dquot_set_dqinfo);
2558 const struct quotactl_ops dquot_quotactl_ops = {
2559 .quota_on = dquot_quota_on,
2560 .quota_off = dquot_quota_off,
2561 .quota_sync = dquot_quota_sync,
2562 .get_info = dquot_get_dqinfo,
2563 .set_info = dquot_set_dqinfo,
2564 .get_dqblk = dquot_get_dqblk,
2565 .set_dqblk = dquot_set_dqblk
2567 EXPORT_SYMBOL(dquot_quotactl_ops);
2569 static int do_proc_dqstats(struct ctl_table *table, int write,
2570 void __user *buffer, size_t *lenp, loff_t *ppos)
2572 unsigned int type = (int *)table->data - dqstats.stat;
2574 /* Update global table */
2575 dqstats.stat[type] =
2576 percpu_counter_sum_positive(&dqstats.counter[type]);
2577 return proc_dointvec(table, write, buffer, lenp, ppos);
2580 static struct ctl_table fs_dqstats_table[] = {
2582 .procname = "lookups",
2583 .data = &dqstats.stat[DQST_LOOKUPS],
2584 .maxlen = sizeof(int),
2586 .proc_handler = do_proc_dqstats,
2589 .procname = "drops",
2590 .data = &dqstats.stat[DQST_DROPS],
2591 .maxlen = sizeof(int),
2593 .proc_handler = do_proc_dqstats,
2596 .procname = "reads",
2597 .data = &dqstats.stat[DQST_READS],
2598 .maxlen = sizeof(int),
2600 .proc_handler = do_proc_dqstats,
2603 .procname = "writes",
2604 .data = &dqstats.stat[DQST_WRITES],
2605 .maxlen = sizeof(int),
2607 .proc_handler = do_proc_dqstats,
2610 .procname = "cache_hits",
2611 .data = &dqstats.stat[DQST_CACHE_HITS],
2612 .maxlen = sizeof(int),
2614 .proc_handler = do_proc_dqstats,
2617 .procname = "allocated_dquots",
2618 .data = &dqstats.stat[DQST_ALLOC_DQUOTS],
2619 .maxlen = sizeof(int),
2621 .proc_handler = do_proc_dqstats,
2624 .procname = "free_dquots",
2625 .data = &dqstats.stat[DQST_FREE_DQUOTS],
2626 .maxlen = sizeof(int),
2628 .proc_handler = do_proc_dqstats,
2631 .procname = "syncs",
2632 .data = &dqstats.stat[DQST_SYNCS],
2633 .maxlen = sizeof(int),
2635 .proc_handler = do_proc_dqstats,
2637 #ifdef CONFIG_PRINT_QUOTA_WARNING
2639 .procname = "warnings",
2640 .data = &flag_print_warnings,
2641 .maxlen = sizeof(int),
2643 .proc_handler = proc_dointvec,
2649 static struct ctl_table fs_table[] = {
2651 .procname = "quota",
2653 .child = fs_dqstats_table,
2658 static struct ctl_table sys_table[] = {
2667 static int __init dquot_init(void)
2670 unsigned long nr_hash, order;
2672 printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
2674 register_sysctl_table(sys_table);
2676 dquot_cachep = kmem_cache_create("dquot",
2677 sizeof(struct dquot), sizeof(unsigned long) * 4,
2678 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
2679 SLAB_MEM_SPREAD|SLAB_PANIC),
2683 dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
2685 panic("Cannot create dquot hash table");
2687 for (i = 0; i < _DQST_DQSTAT_LAST; i++) {
2688 ret = percpu_counter_init(&dqstats.counter[i], 0);
2690 panic("Cannot create dquot stat counters");
2693 /* Find power-of-two hlist_heads which can fit into allocation */
2694 nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
2698 } while (nr_hash >> dq_hash_bits);
2701 nr_hash = 1UL << dq_hash_bits;
2702 dq_hash_mask = nr_hash - 1;
2703 for (i = 0; i < nr_hash; i++)
2704 INIT_HLIST_HEAD(dquot_hash + i);
2706 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2707 nr_hash, order, (PAGE_SIZE << order));
2709 register_shrinker(&dqcache_shrinker);
2713 module_init(dquot_init);