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 <linux/writeback.h> /* for inode_lock, oddly enough.. */
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 #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING)
136 static char *quotatypes[] = INITQFNAMES;
138 static struct quota_format_type *quota_formats; /* List of registered formats */
139 static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES;
141 /* SLAB cache for dquot structures */
142 static struct kmem_cache *dquot_cachep;
144 int register_quota_format(struct quota_format_type *fmt)
146 spin_lock(&dq_list_lock);
147 fmt->qf_next = quota_formats;
149 spin_unlock(&dq_list_lock);
152 EXPORT_SYMBOL(register_quota_format);
154 void unregister_quota_format(struct quota_format_type *fmt)
156 struct quota_format_type **actqf;
158 spin_lock(&dq_list_lock);
159 for (actqf = "a_formats; *actqf && *actqf != fmt;
160 actqf = &(*actqf)->qf_next)
163 *actqf = (*actqf)->qf_next;
164 spin_unlock(&dq_list_lock);
166 EXPORT_SYMBOL(unregister_quota_format);
168 static struct quota_format_type *find_quota_format(int id)
170 struct quota_format_type *actqf;
172 spin_lock(&dq_list_lock);
173 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id;
174 actqf = actqf->qf_next)
176 if (!actqf || !try_module_get(actqf->qf_owner)) {
179 spin_unlock(&dq_list_lock);
181 for (qm = 0; module_names[qm].qm_fmt_id &&
182 module_names[qm].qm_fmt_id != id; qm++)
184 if (!module_names[qm].qm_fmt_id ||
185 request_module(module_names[qm].qm_mod_name))
188 spin_lock(&dq_list_lock);
189 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id;
190 actqf = actqf->qf_next)
192 if (actqf && !try_module_get(actqf->qf_owner))
195 spin_unlock(&dq_list_lock);
199 static void put_quota_format(struct quota_format_type *fmt)
201 module_put(fmt->qf_owner);
205 * Dquot List Management:
206 * The quota code uses three lists for dquot management: the inuse_list,
207 * free_dquots, and dquot_hash[] array. A single dquot structure may be
208 * on all three lists, depending on its current state.
210 * All dquots are placed to the end of inuse_list when first created, and this
211 * list is used for invalidate operation, which must look at every dquot.
213 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
214 * and this list is searched whenever we need an available dquot. Dquots are
215 * removed from the list as soon as they are used again, and
216 * dqstats.free_dquots gives the number of dquots on the list. When
217 * dquot is invalidated it's completely released from memory.
219 * Dquots with a specific identity (device, type and id) are placed on
220 * one of the dquot_hash[] hash chains. The provides an efficient search
221 * mechanism to locate a specific dquot.
224 static LIST_HEAD(inuse_list);
225 static LIST_HEAD(free_dquots);
226 static unsigned int dq_hash_bits, dq_hash_mask;
227 static struct hlist_head *dquot_hash;
229 struct dqstats dqstats;
230 EXPORT_SYMBOL(dqstats);
232 static qsize_t inode_get_rsv_space(struct inode *inode);
233 static void __dquot_initialize(struct inode *inode, int type);
235 static inline unsigned int
236 hashfn(const struct super_block *sb, unsigned int id, int type)
240 tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
241 return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
245 * Following list functions expect dq_list_lock to be held
247 static inline void insert_dquot_hash(struct dquot *dquot)
249 struct hlist_head *head;
250 head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type);
251 hlist_add_head(&dquot->dq_hash, head);
254 static inline void remove_dquot_hash(struct dquot *dquot)
256 hlist_del_init(&dquot->dq_hash);
259 static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb,
260 unsigned int id, int type)
262 struct hlist_node *node;
265 hlist_for_each (node, dquot_hash+hashent) {
266 dquot = hlist_entry(node, struct dquot, dq_hash);
267 if (dquot->dq_sb == sb && dquot->dq_id == id &&
268 dquot->dq_type == type)
274 /* Add a dquot to the tail of the free list */
275 static inline void put_dquot_last(struct dquot *dquot)
277 list_add_tail(&dquot->dq_free, &free_dquots);
278 dqstats_inc(DQST_FREE_DQUOTS);
281 static inline void remove_free_dquot(struct dquot *dquot)
283 if (list_empty(&dquot->dq_free))
285 list_del_init(&dquot->dq_free);
286 dqstats_dec(DQST_FREE_DQUOTS);
289 static inline void put_inuse(struct dquot *dquot)
291 /* We add to the back of inuse list so we don't have to restart
292 * when traversing this list and we block */
293 list_add_tail(&dquot->dq_inuse, &inuse_list);
294 dqstats_inc(DQST_ALLOC_DQUOTS);
297 static inline void remove_inuse(struct dquot *dquot)
299 dqstats_dec(DQST_ALLOC_DQUOTS);
300 list_del(&dquot->dq_inuse);
303 * End of list functions needing dq_list_lock
306 static void wait_on_dquot(struct dquot *dquot)
308 mutex_lock(&dquot->dq_lock);
309 mutex_unlock(&dquot->dq_lock);
312 static inline int dquot_dirty(struct dquot *dquot)
314 return test_bit(DQ_MOD_B, &dquot->dq_flags);
317 static inline int mark_dquot_dirty(struct dquot *dquot)
319 return dquot->dq_sb->dq_op->mark_dirty(dquot);
322 /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */
323 int dquot_mark_dquot_dirty(struct dquot *dquot)
327 /* If quota is dirty already, we don't have to acquire dq_list_lock */
328 if (test_bit(DQ_MOD_B, &dquot->dq_flags))
331 spin_lock(&dq_list_lock);
332 if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) {
333 list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
334 info[dquot->dq_type].dqi_dirty_list);
337 spin_unlock(&dq_list_lock);
340 EXPORT_SYMBOL(dquot_mark_dquot_dirty);
342 /* Dirtify all the dquots - this can block when journalling */
343 static inline int mark_all_dquot_dirty(struct dquot * const *dquot)
348 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
350 /* Even in case of error we have to continue */
351 ret = mark_dquot_dirty(dquot[cnt]);
358 static inline void dqput_all(struct dquot **dquot)
362 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
366 /* This function needs dq_list_lock */
367 static inline int clear_dquot_dirty(struct dquot *dquot)
369 if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
371 list_del_init(&dquot->dq_dirty);
375 void mark_info_dirty(struct super_block *sb, int type)
377 set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
379 EXPORT_SYMBOL(mark_info_dirty);
382 * Read dquot from disk and alloc space for it
385 int dquot_acquire(struct dquot *dquot)
387 int ret = 0, ret2 = 0;
388 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
390 mutex_lock(&dquot->dq_lock);
391 mutex_lock(&dqopt->dqio_mutex);
392 if (!test_bit(DQ_READ_B, &dquot->dq_flags))
393 ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
396 set_bit(DQ_READ_B, &dquot->dq_flags);
397 /* Instantiate dquot if needed */
398 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
399 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
400 /* Write the info if needed */
401 if (info_dirty(&dqopt->info[dquot->dq_type])) {
402 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(
403 dquot->dq_sb, dquot->dq_type);
412 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
414 mutex_unlock(&dqopt->dqio_mutex);
415 mutex_unlock(&dquot->dq_lock);
418 EXPORT_SYMBOL(dquot_acquire);
421 * Write dquot to disk
423 int dquot_commit(struct dquot *dquot)
425 int ret = 0, ret2 = 0;
426 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
428 mutex_lock(&dqopt->dqio_mutex);
429 spin_lock(&dq_list_lock);
430 if (!clear_dquot_dirty(dquot)) {
431 spin_unlock(&dq_list_lock);
434 spin_unlock(&dq_list_lock);
435 /* Inactive dquot can be only if there was error during read/init
436 * => we have better not writing it */
437 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
438 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
439 if (info_dirty(&dqopt->info[dquot->dq_type])) {
440 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(
441 dquot->dq_sb, dquot->dq_type);
447 mutex_unlock(&dqopt->dqio_mutex);
450 EXPORT_SYMBOL(dquot_commit);
455 int dquot_release(struct dquot *dquot)
457 int ret = 0, ret2 = 0;
458 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
460 mutex_lock(&dquot->dq_lock);
461 /* Check whether we are not racing with some other dqget() */
462 if (atomic_read(&dquot->dq_count) > 1)
464 mutex_lock(&dqopt->dqio_mutex);
465 if (dqopt->ops[dquot->dq_type]->release_dqblk) {
466 ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
468 if (info_dirty(&dqopt->info[dquot->dq_type])) {
469 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(
470 dquot->dq_sb, dquot->dq_type);
475 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
476 mutex_unlock(&dqopt->dqio_mutex);
478 mutex_unlock(&dquot->dq_lock);
481 EXPORT_SYMBOL(dquot_release);
483 void dquot_destroy(struct dquot *dquot)
485 kmem_cache_free(dquot_cachep, dquot);
487 EXPORT_SYMBOL(dquot_destroy);
489 static inline void do_destroy_dquot(struct dquot *dquot)
491 dquot->dq_sb->dq_op->destroy_dquot(dquot);
494 /* Invalidate all dquots on the list. Note that this function is called after
495 * quota is disabled and pointers from inodes removed so there cannot be new
496 * quota users. There can still be some users of quotas due to inodes being
497 * just deleted or pruned by prune_icache() (those are not attached to any
498 * list) or parallel quotactl call. We have to wait for such users.
500 static void invalidate_dquots(struct super_block *sb, int type)
502 struct dquot *dquot, *tmp;
505 spin_lock(&dq_list_lock);
506 list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
507 if (dquot->dq_sb != sb)
509 if (dquot->dq_type != type)
511 /* Wait for dquot users */
512 if (atomic_read(&dquot->dq_count)) {
515 atomic_inc(&dquot->dq_count);
516 prepare_to_wait(&dquot->dq_wait_unused, &wait,
517 TASK_UNINTERRUPTIBLE);
518 spin_unlock(&dq_list_lock);
519 /* Once dqput() wakes us up, we know it's time to free
521 * IMPORTANT: we rely on the fact that there is always
522 * at most one process waiting for dquot to free.
523 * Otherwise dq_count would be > 1 and we would never
526 if (atomic_read(&dquot->dq_count) > 1)
528 finish_wait(&dquot->dq_wait_unused, &wait);
530 /* At this moment dquot() need not exist (it could be
531 * reclaimed by prune_dqcache(). Hence we must
536 * Quota now has no users and it has been written on last
539 remove_dquot_hash(dquot);
540 remove_free_dquot(dquot);
542 do_destroy_dquot(dquot);
544 spin_unlock(&dq_list_lock);
547 /* Call callback for every active dquot on given filesystem */
548 int dquot_scan_active(struct super_block *sb,
549 int (*fn)(struct dquot *dquot, unsigned long priv),
552 struct dquot *dquot, *old_dquot = NULL;
555 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
556 spin_lock(&dq_list_lock);
557 list_for_each_entry(dquot, &inuse_list, dq_inuse) {
558 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
560 if (dquot->dq_sb != sb)
562 /* Now we have active dquot so we can just increase use count */
563 atomic_inc(&dquot->dq_count);
564 spin_unlock(&dq_list_lock);
565 dqstats_inc(DQST_LOOKUPS);
568 ret = fn(dquot, priv);
571 spin_lock(&dq_list_lock);
572 /* We are safe to continue now because our dquot could not
573 * be moved out of the inuse list while we hold the reference */
575 spin_unlock(&dq_list_lock);
578 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
581 EXPORT_SYMBOL(dquot_scan_active);
583 int dquot_quota_sync(struct super_block *sb, int type, int wait)
585 struct list_head *dirty;
587 struct quota_info *dqopt = sb_dqopt(sb);
590 mutex_lock(&dqopt->dqonoff_mutex);
591 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
592 if (type != -1 && cnt != type)
594 if (!sb_has_quota_active(sb, cnt))
596 spin_lock(&dq_list_lock);
597 dirty = &dqopt->info[cnt].dqi_dirty_list;
598 while (!list_empty(dirty)) {
599 dquot = list_first_entry(dirty, struct dquot,
601 /* Dirty and inactive can be only bad dquot... */
602 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
603 clear_dquot_dirty(dquot);
606 /* Now we have active dquot from which someone is
607 * holding reference so we can safely just increase
609 atomic_inc(&dquot->dq_count);
610 spin_unlock(&dq_list_lock);
611 dqstats_inc(DQST_LOOKUPS);
612 sb->dq_op->write_dquot(dquot);
614 spin_lock(&dq_list_lock);
616 spin_unlock(&dq_list_lock);
619 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
620 if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt)
621 && info_dirty(&dqopt->info[cnt]))
622 sb->dq_op->write_info(sb, cnt);
623 dqstats_inc(DQST_SYNCS);
624 mutex_unlock(&dqopt->dqonoff_mutex);
626 if (!wait || (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE))
629 /* This is not very clever (and fast) but currently I don't know about
630 * any other simple way of getting quota data to disk and we must get
631 * them there for userspace to be visible... */
632 if (sb->s_op->sync_fs)
633 sb->s_op->sync_fs(sb, 1);
634 sync_blockdev(sb->s_bdev);
637 * Now when everything is written we can discard the pagecache so
638 * that userspace sees the changes.
640 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
641 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
642 if (type != -1 && cnt != type)
644 if (!sb_has_quota_active(sb, cnt))
646 mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex,
648 truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0);
649 mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex);
651 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
655 EXPORT_SYMBOL(dquot_quota_sync);
657 /* Free unused dquots from cache */
658 static void prune_dqcache(int count)
660 struct list_head *head;
663 head = free_dquots.prev;
664 while (head != &free_dquots && count) {
665 dquot = list_entry(head, struct dquot, dq_free);
666 remove_dquot_hash(dquot);
667 remove_free_dquot(dquot);
669 do_destroy_dquot(dquot);
671 head = free_dquots.prev;
676 * This is called from kswapd when we think we need some
679 static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
682 spin_lock(&dq_list_lock);
684 spin_unlock(&dq_list_lock);
687 percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS])
688 /100) * sysctl_vfs_cache_pressure;
691 static struct shrinker dqcache_shrinker = {
692 .shrink = shrink_dqcache_memory,
693 .seeks = DEFAULT_SEEKS,
697 * Put reference to dquot
698 * NOTE: If you change this function please check whether dqput_blocks() works right...
700 void dqput(struct dquot *dquot)
706 #ifdef CONFIG_QUOTA_DEBUG
707 if (!atomic_read(&dquot->dq_count)) {
708 printk("VFS: dqput: trying to free free dquot\n");
709 printk("VFS: device %s, dquot of %s %d\n",
711 quotatypes[dquot->dq_type],
716 dqstats_inc(DQST_DROPS);
718 spin_lock(&dq_list_lock);
719 if (atomic_read(&dquot->dq_count) > 1) {
720 /* We have more than one user... nothing to do */
721 atomic_dec(&dquot->dq_count);
722 /* Releasing dquot during quotaoff phase? */
723 if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) &&
724 atomic_read(&dquot->dq_count) == 1)
725 wake_up(&dquot->dq_wait_unused);
726 spin_unlock(&dq_list_lock);
729 /* Need to release dquot? */
730 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
731 spin_unlock(&dq_list_lock);
732 /* Commit dquot before releasing */
733 ret = dquot->dq_sb->dq_op->write_dquot(dquot);
735 printk(KERN_ERR "VFS: cannot write quota structure on "
736 "device %s (error %d). Quota may get out of "
737 "sync!\n", dquot->dq_sb->s_id, ret);
739 * We clear dirty bit anyway, so that we avoid
742 spin_lock(&dq_list_lock);
743 clear_dquot_dirty(dquot);
744 spin_unlock(&dq_list_lock);
748 /* Clear flag in case dquot was inactive (something bad happened) */
749 clear_dquot_dirty(dquot);
750 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
751 spin_unlock(&dq_list_lock);
752 dquot->dq_sb->dq_op->release_dquot(dquot);
755 atomic_dec(&dquot->dq_count);
756 #ifdef CONFIG_QUOTA_DEBUG
758 BUG_ON(!list_empty(&dquot->dq_free));
760 put_dquot_last(dquot);
761 spin_unlock(&dq_list_lock);
763 EXPORT_SYMBOL(dqput);
765 struct dquot *dquot_alloc(struct super_block *sb, int type)
767 return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
769 EXPORT_SYMBOL(dquot_alloc);
771 static struct dquot *get_empty_dquot(struct super_block *sb, int type)
775 dquot = sb->dq_op->alloc_dquot(sb, type);
779 mutex_init(&dquot->dq_lock);
780 INIT_LIST_HEAD(&dquot->dq_free);
781 INIT_LIST_HEAD(&dquot->dq_inuse);
782 INIT_HLIST_NODE(&dquot->dq_hash);
783 INIT_LIST_HEAD(&dquot->dq_dirty);
784 init_waitqueue_head(&dquot->dq_wait_unused);
786 dquot->dq_type = type;
787 atomic_set(&dquot->dq_count, 1);
793 * Get reference to dquot
795 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
796 * destroying our dquot by:
797 * a) checking for quota flags under dq_list_lock and
798 * b) getting a reference to dquot before we release dq_list_lock
800 struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
802 unsigned int hashent = hashfn(sb, id, type);
803 struct dquot *dquot = NULL, *empty = NULL;
805 if (!sb_has_quota_active(sb, type))
808 spin_lock(&dq_list_lock);
809 spin_lock(&dq_state_lock);
810 if (!sb_has_quota_active(sb, type)) {
811 spin_unlock(&dq_state_lock);
812 spin_unlock(&dq_list_lock);
815 spin_unlock(&dq_state_lock);
817 dquot = find_dquot(hashent, sb, id, type);
820 spin_unlock(&dq_list_lock);
821 empty = get_empty_dquot(sb, type);
823 schedule(); /* Try to wait for a moment... */
829 /* all dquots go on the inuse_list */
831 /* hash it first so it can be found */
832 insert_dquot_hash(dquot);
833 spin_unlock(&dq_list_lock);
834 dqstats_inc(DQST_LOOKUPS);
836 if (!atomic_read(&dquot->dq_count))
837 remove_free_dquot(dquot);
838 atomic_inc(&dquot->dq_count);
839 spin_unlock(&dq_list_lock);
840 dqstats_inc(DQST_CACHE_HITS);
841 dqstats_inc(DQST_LOOKUPS);
843 /* Wait for dq_lock - after this we know that either dquot_release() is
844 * already finished or it will be canceled due to dq_count > 1 test */
845 wait_on_dquot(dquot);
846 /* Read the dquot / allocate space in quota file */
847 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) &&
848 sb->dq_op->acquire_dquot(dquot) < 0) {
853 #ifdef CONFIG_QUOTA_DEBUG
854 BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
858 do_destroy_dquot(empty);
862 EXPORT_SYMBOL(dqget);
864 static int dqinit_needed(struct inode *inode, int type)
868 if (IS_NOQUOTA(inode))
871 return !inode->i_dquot[type];
872 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
873 if (!inode->i_dquot[cnt])
878 /* This routine is guarded by dqonoff_mutex mutex */
879 static void add_dquot_ref(struct super_block *sb, int type)
881 struct inode *inode, *old_inode = NULL;
882 #ifdef CONFIG_QUOTA_DEBUG
886 spin_lock(&inode_lock);
887 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
888 if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE|I_NEW))
890 #ifdef CONFIG_QUOTA_DEBUG
891 if (unlikely(inode_get_rsv_space(inode) > 0))
894 if (!atomic_read(&inode->i_writecount))
896 if (!dqinit_needed(inode, type))
900 spin_unlock(&inode_lock);
903 __dquot_initialize(inode, type);
904 /* We hold a reference to 'inode' so it couldn't have been
905 * removed from s_inodes list while we dropped the inode_lock.
906 * We cannot iput the inode now as we can be holding the last
907 * reference and we cannot iput it under inode_lock. So we
908 * keep the reference and iput it later. */
910 spin_lock(&inode_lock);
912 spin_unlock(&inode_lock);
915 #ifdef CONFIG_QUOTA_DEBUG
917 printk(KERN_WARNING "VFS (%s): Writes happened before quota"
918 " was turned on thus quota information is probably "
919 "inconsistent. Please run quotacheck(8).\n", sb->s_id);
925 * Return 0 if dqput() won't block.
926 * (note that 1 doesn't necessarily mean blocking)
928 static inline int dqput_blocks(struct dquot *dquot)
930 if (atomic_read(&dquot->dq_count) <= 1)
936 * Remove references to dquots from inode and add dquot to list for freeing
937 * if we have the last referece to dquot
938 * We can't race with anybody because we hold dqptr_sem for writing...
940 static int remove_inode_dquot_ref(struct inode *inode, int type,
941 struct list_head *tofree_head)
943 struct dquot *dquot = inode->i_dquot[type];
945 inode->i_dquot[type] = NULL;
947 if (dqput_blocks(dquot)) {
948 #ifdef CONFIG_QUOTA_DEBUG
949 if (atomic_read(&dquot->dq_count) != 1)
950 printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count));
952 spin_lock(&dq_list_lock);
953 /* As dquot must have currently users it can't be on
954 * the free list... */
955 list_add(&dquot->dq_free, tofree_head);
956 spin_unlock(&dq_list_lock);
960 dqput(dquot); /* We have guaranteed we won't block */
966 * Free list of dquots
967 * Dquots are removed from inodes and no new references can be got so we are
968 * the only ones holding reference
970 static void put_dquot_list(struct list_head *tofree_head)
972 struct list_head *act_head;
975 act_head = tofree_head->next;
976 while (act_head != tofree_head) {
977 dquot = list_entry(act_head, struct dquot, dq_free);
978 act_head = act_head->next;
979 /* Remove dquot from the list so we won't have problems... */
980 list_del_init(&dquot->dq_free);
985 static void remove_dquot_ref(struct super_block *sb, int type,
986 struct list_head *tofree_head)
990 spin_lock(&inode_lock);
991 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
993 * We have to scan also I_NEW inodes because they can already
994 * have quota pointer initialized. Luckily, we need to touch
995 * only quota pointers and these have separate locking
998 if (!IS_NOQUOTA(inode))
999 remove_inode_dquot_ref(inode, type, tofree_head);
1001 spin_unlock(&inode_lock);
1004 /* Gather all references from inodes and drop them */
1005 static void drop_dquot_ref(struct super_block *sb, int type)
1007 LIST_HEAD(tofree_head);
1010 down_write(&sb_dqopt(sb)->dqptr_sem);
1011 remove_dquot_ref(sb, type, &tofree_head);
1012 up_write(&sb_dqopt(sb)->dqptr_sem);
1013 put_dquot_list(&tofree_head);
1017 static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
1019 dquot->dq_dqb.dqb_curinodes += number;
1022 static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
1024 dquot->dq_dqb.dqb_curspace += number;
1027 static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
1029 dquot->dq_dqb.dqb_rsvspace += number;
1033 * Claim reserved quota space
1035 static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number)
1037 if (dquot->dq_dqb.dqb_rsvspace < number) {
1039 number = dquot->dq_dqb.dqb_rsvspace;
1041 dquot->dq_dqb.dqb_curspace += number;
1042 dquot->dq_dqb.dqb_rsvspace -= number;
1046 void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
1048 if (dquot->dq_dqb.dqb_rsvspace >= number)
1049 dquot->dq_dqb.dqb_rsvspace -= number;
1052 dquot->dq_dqb.dqb_rsvspace = 0;
1056 static void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
1058 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
1059 dquot->dq_dqb.dqb_curinodes >= number)
1060 dquot->dq_dqb.dqb_curinodes -= number;
1062 dquot->dq_dqb.dqb_curinodes = 0;
1063 if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
1064 dquot->dq_dqb.dqb_itime = (time_t) 0;
1065 clear_bit(DQ_INODES_B, &dquot->dq_flags);
1068 static void dquot_decr_space(struct dquot *dquot, qsize_t number)
1070 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
1071 dquot->dq_dqb.dqb_curspace >= number)
1072 dquot->dq_dqb.dqb_curspace -= number;
1074 dquot->dq_dqb.dqb_curspace = 0;
1075 if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
1076 dquot->dq_dqb.dqb_btime = (time_t) 0;
1077 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
1080 static int warning_issued(struct dquot *dquot, const int warntype)
1082 int flag = (warntype == QUOTA_NL_BHARDWARN ||
1083 warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
1084 ((warntype == QUOTA_NL_IHARDWARN ||
1085 warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
1089 return test_and_set_bit(flag, &dquot->dq_flags);
1092 #ifdef CONFIG_PRINT_QUOTA_WARNING
1093 static int flag_print_warnings = 1;
1095 static int need_print_warning(struct dquot *dquot)
1097 if (!flag_print_warnings)
1100 switch (dquot->dq_type) {
1102 return current_fsuid() == dquot->dq_id;
1104 return in_group_p(dquot->dq_id);
1109 /* Print warning to user which exceeded quota */
1110 static void print_warning(struct dquot *dquot, const int warntype)
1113 struct tty_struct *tty;
1115 if (warntype == QUOTA_NL_IHARDBELOW ||
1116 warntype == QUOTA_NL_ISOFTBELOW ||
1117 warntype == QUOTA_NL_BHARDBELOW ||
1118 warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot))
1121 tty = get_current_tty();
1124 tty_write_message(tty, dquot->dq_sb->s_id);
1125 if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
1126 tty_write_message(tty, ": warning, ");
1128 tty_write_message(tty, ": write failed, ");
1129 tty_write_message(tty, quotatypes[dquot->dq_type]);
1131 case QUOTA_NL_IHARDWARN:
1132 msg = " file limit reached.\r\n";
1134 case QUOTA_NL_ISOFTLONGWARN:
1135 msg = " file quota exceeded too long.\r\n";
1137 case QUOTA_NL_ISOFTWARN:
1138 msg = " file quota exceeded.\r\n";
1140 case QUOTA_NL_BHARDWARN:
1141 msg = " block limit reached.\r\n";
1143 case QUOTA_NL_BSOFTLONGWARN:
1144 msg = " block quota exceeded too long.\r\n";
1146 case QUOTA_NL_BSOFTWARN:
1147 msg = " block quota exceeded.\r\n";
1150 tty_write_message(tty, msg);
1156 * Write warnings to the console and send warning messages over netlink.
1158 * Note that this function can sleep.
1160 static void flush_warnings(struct dquot *const *dquots, char *warntype)
1165 for (i = 0; i < MAXQUOTAS; i++) {
1167 if (dq && warntype[i] != QUOTA_NL_NOWARN &&
1168 !warning_issued(dq, warntype[i])) {
1169 #ifdef CONFIG_PRINT_QUOTA_WARNING
1170 print_warning(dq, warntype[i]);
1172 quota_send_warning(dq->dq_type, dq->dq_id,
1173 dq->dq_sb->s_dev, warntype[i]);
1178 static int ignore_hardlimit(struct dquot *dquot)
1180 struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
1182 return capable(CAP_SYS_RESOURCE) &&
1183 (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD ||
1184 !(info->dqi_flags & V1_DQF_RSQUASH));
1187 /* needs dq_data_lock */
1188 static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype)
1190 qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes;
1192 *warntype = QUOTA_NL_NOWARN;
1193 if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
1194 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1197 if (dquot->dq_dqb.dqb_ihardlimit &&
1198 newinodes > dquot->dq_dqb.dqb_ihardlimit &&
1199 !ignore_hardlimit(dquot)) {
1200 *warntype = QUOTA_NL_IHARDWARN;
1204 if (dquot->dq_dqb.dqb_isoftlimit &&
1205 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1206 dquot->dq_dqb.dqb_itime &&
1207 get_seconds() >= dquot->dq_dqb.dqb_itime &&
1208 !ignore_hardlimit(dquot)) {
1209 *warntype = QUOTA_NL_ISOFTLONGWARN;
1213 if (dquot->dq_dqb.dqb_isoftlimit &&
1214 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1215 dquot->dq_dqb.dqb_itime == 0) {
1216 *warntype = QUOTA_NL_ISOFTWARN;
1217 dquot->dq_dqb.dqb_itime = get_seconds() +
1218 sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
1224 /* needs dq_data_lock */
1225 static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype)
1228 struct super_block *sb = dquot->dq_sb;
1230 *warntype = QUOTA_NL_NOWARN;
1231 if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) ||
1232 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1235 tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace
1238 if (dquot->dq_dqb.dqb_bhardlimit &&
1239 tspace > dquot->dq_dqb.dqb_bhardlimit &&
1240 !ignore_hardlimit(dquot)) {
1242 *warntype = QUOTA_NL_BHARDWARN;
1246 if (dquot->dq_dqb.dqb_bsoftlimit &&
1247 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
1248 dquot->dq_dqb.dqb_btime &&
1249 get_seconds() >= dquot->dq_dqb.dqb_btime &&
1250 !ignore_hardlimit(dquot)) {
1252 *warntype = QUOTA_NL_BSOFTLONGWARN;
1256 if (dquot->dq_dqb.dqb_bsoftlimit &&
1257 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
1258 dquot->dq_dqb.dqb_btime == 0) {
1260 *warntype = QUOTA_NL_BSOFTWARN;
1261 dquot->dq_dqb.dqb_btime = get_seconds() +
1262 sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace;
1266 * We don't allow preallocation to exceed softlimit so exceeding will
1275 static int info_idq_free(struct dquot *dquot, qsize_t inodes)
1279 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1280 dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit ||
1281 !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type))
1282 return QUOTA_NL_NOWARN;
1284 newinodes = dquot->dq_dqb.dqb_curinodes - inodes;
1285 if (newinodes <= dquot->dq_dqb.dqb_isoftlimit)
1286 return QUOTA_NL_ISOFTBELOW;
1287 if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
1288 newinodes < dquot->dq_dqb.dqb_ihardlimit)
1289 return QUOTA_NL_IHARDBELOW;
1290 return QUOTA_NL_NOWARN;
1293 static int info_bdq_free(struct dquot *dquot, qsize_t space)
1295 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1296 dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
1297 return QUOTA_NL_NOWARN;
1299 if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit)
1300 return QUOTA_NL_BSOFTBELOW;
1301 if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit &&
1302 dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit)
1303 return QUOTA_NL_BHARDBELOW;
1304 return QUOTA_NL_NOWARN;
1308 * Initialize quota pointers in inode
1310 * We do things in a bit complicated way but by that we avoid calling
1311 * dqget() and thus filesystem callbacks under dqptr_sem.
1313 * It is better to call this function outside of any transaction as it
1314 * might need a lot of space in journal for dquot structure allocation.
1316 static void __dquot_initialize(struct inode *inode, int type)
1318 unsigned int id = 0;
1320 struct dquot *got[MAXQUOTAS];
1321 struct super_block *sb = inode->i_sb;
1324 /* First test before acquiring mutex - solves deadlocks when we
1325 * re-enter the quota code and are already holding the mutex */
1326 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode))
1329 /* First get references to structures we might need. */
1330 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1332 if (type != -1 && cnt != type)
1342 got[cnt] = dqget(sb, id, cnt);
1345 down_write(&sb_dqopt(sb)->dqptr_sem);
1346 if (IS_NOQUOTA(inode))
1348 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1349 if (type != -1 && cnt != type)
1351 /* Avoid races with quotaoff() */
1352 if (!sb_has_quota_active(sb, cnt))
1354 if (!inode->i_dquot[cnt]) {
1355 inode->i_dquot[cnt] = got[cnt];
1358 * Make quota reservation system happy if someone
1359 * did a write before quota was turned on
1361 rsv = inode_get_rsv_space(inode);
1363 dquot_resv_space(inode->i_dquot[cnt], rsv);
1367 up_write(&sb_dqopt(sb)->dqptr_sem);
1368 /* Drop unused references */
1372 void dquot_initialize(struct inode *inode)
1374 __dquot_initialize(inode, -1);
1376 EXPORT_SYMBOL(dquot_initialize);
1379 * Release all quotas referenced by inode
1381 static void __dquot_drop(struct inode *inode)
1384 struct dquot *put[MAXQUOTAS];
1386 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1387 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1388 put[cnt] = inode->i_dquot[cnt];
1389 inode->i_dquot[cnt] = NULL;
1391 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1395 void dquot_drop(struct inode *inode)
1399 if (IS_NOQUOTA(inode))
1403 * Test before calling to rule out calls from proc and such
1404 * where we are not allowed to block. Note that this is
1405 * actually reliable test even without the lock - the caller
1406 * must assure that nobody can come after the DQUOT_DROP and
1407 * add quota pointers back anyway.
1409 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1410 if (inode->i_dquot[cnt])
1414 if (cnt < MAXQUOTAS)
1415 __dquot_drop(inode);
1417 EXPORT_SYMBOL(dquot_drop);
1420 * inode_reserved_space is managed internally by quota, and protected by
1421 * i_lock similar to i_blocks+i_bytes.
1423 static qsize_t *inode_reserved_space(struct inode * inode)
1425 /* Filesystem must explicitly define it's own method in order to use
1426 * quota reservation interface */
1427 BUG_ON(!inode->i_sb->dq_op->get_reserved_space);
1428 return inode->i_sb->dq_op->get_reserved_space(inode);
1431 void inode_add_rsv_space(struct inode *inode, qsize_t number)
1433 spin_lock(&inode->i_lock);
1434 *inode_reserved_space(inode) += number;
1435 spin_unlock(&inode->i_lock);
1437 EXPORT_SYMBOL(inode_add_rsv_space);
1439 void inode_claim_rsv_space(struct inode *inode, qsize_t number)
1441 spin_lock(&inode->i_lock);
1442 *inode_reserved_space(inode) -= number;
1443 __inode_add_bytes(inode, number);
1444 spin_unlock(&inode->i_lock);
1446 EXPORT_SYMBOL(inode_claim_rsv_space);
1448 void inode_sub_rsv_space(struct inode *inode, qsize_t number)
1450 spin_lock(&inode->i_lock);
1451 *inode_reserved_space(inode) -= number;
1452 spin_unlock(&inode->i_lock);
1454 EXPORT_SYMBOL(inode_sub_rsv_space);
1456 static qsize_t inode_get_rsv_space(struct inode *inode)
1460 if (!inode->i_sb->dq_op->get_reserved_space)
1462 spin_lock(&inode->i_lock);
1463 ret = *inode_reserved_space(inode);
1464 spin_unlock(&inode->i_lock);
1468 static void inode_incr_space(struct inode *inode, qsize_t number,
1472 inode_add_rsv_space(inode, number);
1474 inode_add_bytes(inode, number);
1477 static void inode_decr_space(struct inode *inode, qsize_t number, int reserve)
1480 inode_sub_rsv_space(inode, number);
1482 inode_sub_bytes(inode, number);
1486 * This functions updates i_blocks+i_bytes fields and quota information
1487 * (together with appropriate checks).
1489 * NOTE: We absolutely rely on the fact that caller dirties the inode
1490 * (usually helpers in quotaops.h care about this) and holds a handle for
1491 * the current transaction so that dquot write and inode write go into the
1496 * This operation can block, but only after everything is updated
1498 int __dquot_alloc_space(struct inode *inode, qsize_t number,
1499 int warn, int reserve)
1502 char warntype[MAXQUOTAS];
1505 * First test before acquiring mutex - solves deadlocks when we
1506 * re-enter the quota code and are already holding the mutex
1508 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) {
1509 inode_incr_space(inode, number, reserve);
1513 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1514 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1515 warntype[cnt] = QUOTA_NL_NOWARN;
1517 spin_lock(&dq_data_lock);
1518 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1519 if (!inode->i_dquot[cnt])
1521 ret = check_bdq(inode->i_dquot[cnt], number, !warn,
1524 spin_unlock(&dq_data_lock);
1525 goto out_flush_warn;
1528 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1529 if (!inode->i_dquot[cnt])
1532 dquot_resv_space(inode->i_dquot[cnt], number);
1534 dquot_incr_space(inode->i_dquot[cnt], number);
1536 inode_incr_space(inode, number, reserve);
1537 spin_unlock(&dq_data_lock);
1540 goto out_flush_warn;
1541 mark_all_dquot_dirty(inode->i_dquot);
1543 flush_warnings(inode->i_dquot, warntype);
1544 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1548 EXPORT_SYMBOL(__dquot_alloc_space);
1551 * This operation can block, but only after everything is updated
1553 int dquot_alloc_inode(const struct inode *inode)
1556 char warntype[MAXQUOTAS];
1558 /* First test before acquiring mutex - solves deadlocks when we
1559 * re-enter the quota code and are already holding the mutex */
1560 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode))
1562 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1563 warntype[cnt] = QUOTA_NL_NOWARN;
1564 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1565 spin_lock(&dq_data_lock);
1566 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1567 if (!inode->i_dquot[cnt])
1569 ret = check_idq(inode->i_dquot[cnt], 1, warntype + cnt);
1574 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1575 if (!inode->i_dquot[cnt])
1577 dquot_incr_inodes(inode->i_dquot[cnt], 1);
1581 spin_unlock(&dq_data_lock);
1583 mark_all_dquot_dirty(inode->i_dquot);
1584 flush_warnings(inode->i_dquot, warntype);
1585 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1588 EXPORT_SYMBOL(dquot_alloc_inode);
1591 * Convert in-memory reserved quotas to real consumed quotas
1593 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
1597 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) {
1598 inode_claim_rsv_space(inode, number);
1602 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1603 spin_lock(&dq_data_lock);
1604 /* Claim reserved quotas to allocated quotas */
1605 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1606 if (inode->i_dquot[cnt])
1607 dquot_claim_reserved_space(inode->i_dquot[cnt],
1610 /* Update inode bytes */
1611 inode_claim_rsv_space(inode, number);
1612 spin_unlock(&dq_data_lock);
1613 mark_all_dquot_dirty(inode->i_dquot);
1614 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1617 EXPORT_SYMBOL(dquot_claim_space_nodirty);
1620 * This operation can block, but only after everything is updated
1622 void __dquot_free_space(struct inode *inode, qsize_t number, int reserve)
1625 char warntype[MAXQUOTAS];
1627 /* First test before acquiring mutex - solves deadlocks when we
1628 * re-enter the quota code and are already holding the mutex */
1629 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) {
1630 inode_decr_space(inode, number, reserve);
1634 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1635 spin_lock(&dq_data_lock);
1636 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1637 if (!inode->i_dquot[cnt])
1639 warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number);
1641 dquot_free_reserved_space(inode->i_dquot[cnt], number);
1643 dquot_decr_space(inode->i_dquot[cnt], number);
1645 inode_decr_space(inode, number, reserve);
1646 spin_unlock(&dq_data_lock);
1650 mark_all_dquot_dirty(inode->i_dquot);
1652 flush_warnings(inode->i_dquot, warntype);
1653 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1655 EXPORT_SYMBOL(__dquot_free_space);
1658 * This operation can block, but only after everything is updated
1660 void dquot_free_inode(const struct inode *inode)
1663 char warntype[MAXQUOTAS];
1665 /* First test before acquiring mutex - solves deadlocks when we
1666 * re-enter the quota code and are already holding the mutex */
1667 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode))
1670 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1671 spin_lock(&dq_data_lock);
1672 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1673 if (!inode->i_dquot[cnt])
1675 warntype[cnt] = info_idq_free(inode->i_dquot[cnt], 1);
1676 dquot_decr_inodes(inode->i_dquot[cnt], 1);
1678 spin_unlock(&dq_data_lock);
1679 mark_all_dquot_dirty(inode->i_dquot);
1680 flush_warnings(inode->i_dquot, warntype);
1681 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1683 EXPORT_SYMBOL(dquot_free_inode);
1686 * Transfer the number of inode and blocks from one diskquota to an other.
1687 * On success, dquot references in transfer_to are consumed and references
1688 * to original dquots that need to be released are placed there. On failure,
1689 * references are kept untouched.
1691 * This operation can block, but only after everything is updated
1692 * A transaction must be started when entering this function.
1695 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to)
1697 qsize_t space, cur_space;
1698 qsize_t rsv_space = 0;
1699 struct dquot *transfer_from[MAXQUOTAS] = {};
1701 char warntype_to[MAXQUOTAS];
1702 char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS];
1704 /* First test before acquiring mutex - solves deadlocks when we
1705 * re-enter the quota code and are already holding the mutex */
1706 if (IS_NOQUOTA(inode))
1708 /* Initialize the arrays */
1709 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1710 warntype_to[cnt] = QUOTA_NL_NOWARN;
1711 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1712 if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
1713 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1716 spin_lock(&dq_data_lock);
1717 cur_space = inode_get_bytes(inode);
1718 rsv_space = inode_get_rsv_space(inode);
1719 space = cur_space + rsv_space;
1720 /* Build the transfer_from list and check the limits */
1721 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1722 if (!transfer_to[cnt])
1724 transfer_from[cnt] = inode->i_dquot[cnt];
1725 ret = check_idq(transfer_to[cnt], 1, warntype_to + cnt);
1728 ret = check_bdq(transfer_to[cnt], space, 0, warntype_to + cnt);
1734 * Finally perform the needed transfer from transfer_from to transfer_to
1736 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1738 * Skip changes for same uid or gid or for turned off quota-type.
1740 if (!transfer_to[cnt])
1743 /* Due to IO error we might not have transfer_from[] structure */
1744 if (transfer_from[cnt]) {
1745 warntype_from_inodes[cnt] =
1746 info_idq_free(transfer_from[cnt], 1);
1747 warntype_from_space[cnt] =
1748 info_bdq_free(transfer_from[cnt], space);
1749 dquot_decr_inodes(transfer_from[cnt], 1);
1750 dquot_decr_space(transfer_from[cnt], cur_space);
1751 dquot_free_reserved_space(transfer_from[cnt],
1755 dquot_incr_inodes(transfer_to[cnt], 1);
1756 dquot_incr_space(transfer_to[cnt], cur_space);
1757 dquot_resv_space(transfer_to[cnt], rsv_space);
1759 inode->i_dquot[cnt] = transfer_to[cnt];
1761 spin_unlock(&dq_data_lock);
1762 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1764 mark_all_dquot_dirty(transfer_from);
1765 mark_all_dquot_dirty(transfer_to);
1766 /* Pass back references to put */
1767 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1768 transfer_to[cnt] = transfer_from[cnt];
1770 flush_warnings(transfer_to, warntype_to);
1771 flush_warnings(transfer_from, warntype_from_inodes);
1772 flush_warnings(transfer_from, warntype_from_space);
1775 spin_unlock(&dq_data_lock);
1776 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1779 EXPORT_SYMBOL(__dquot_transfer);
1781 /* Wrapper for transferring ownership of an inode for uid/gid only
1782 * Called from FSXXX_setattr()
1784 int dquot_transfer(struct inode *inode, struct iattr *iattr)
1786 struct dquot *transfer_to[MAXQUOTAS] = {};
1787 struct super_block *sb = inode->i_sb;
1790 if (!sb_any_quota_active(sb) || IS_NOQUOTA(inode))
1793 if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid)
1794 transfer_to[USRQUOTA] = dqget(sb, iattr->ia_uid, USRQUOTA);
1795 if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)
1796 transfer_to[GRPQUOTA] = dqget(sb, iattr->ia_gid, GRPQUOTA);
1798 ret = __dquot_transfer(inode, transfer_to);
1799 dqput_all(transfer_to);
1802 EXPORT_SYMBOL(dquot_transfer);
1805 * Write info of quota file to disk
1807 int dquot_commit_info(struct super_block *sb, int type)
1810 struct quota_info *dqopt = sb_dqopt(sb);
1812 mutex_lock(&dqopt->dqio_mutex);
1813 ret = dqopt->ops[type]->write_file_info(sb, type);
1814 mutex_unlock(&dqopt->dqio_mutex);
1817 EXPORT_SYMBOL(dquot_commit_info);
1820 * Definitions of diskquota operations.
1822 const struct dquot_operations dquot_operations = {
1823 .write_dquot = dquot_commit,
1824 .acquire_dquot = dquot_acquire,
1825 .release_dquot = dquot_release,
1826 .mark_dirty = dquot_mark_dquot_dirty,
1827 .write_info = dquot_commit_info,
1828 .alloc_dquot = dquot_alloc,
1829 .destroy_dquot = dquot_destroy,
1831 EXPORT_SYMBOL(dquot_operations);
1834 * Generic helper for ->open on filesystems supporting disk quotas.
1836 int dquot_file_open(struct inode *inode, struct file *file)
1840 error = generic_file_open(inode, file);
1841 if (!error && (file->f_mode & FMODE_WRITE))
1842 dquot_initialize(inode);
1845 EXPORT_SYMBOL(dquot_file_open);
1848 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1850 int dquot_disable(struct super_block *sb, int type, unsigned int flags)
1853 struct quota_info *dqopt = sb_dqopt(sb);
1854 struct inode *toputinode[MAXQUOTAS];
1856 /* Cannot turn off usage accounting without turning off limits, or
1857 * suspend quotas and simultaneously turn quotas off. */
1858 if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED))
1859 || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED |
1860 DQUOT_USAGE_ENABLED)))
1863 /* We need to serialize quota_off() for device */
1864 mutex_lock(&dqopt->dqonoff_mutex);
1867 * Skip everything if there's nothing to do. We have to do this because
1868 * sometimes we are called when fill_super() failed and calling
1869 * sync_fs() in such cases does no good.
1871 if (!sb_any_quota_loaded(sb)) {
1872 mutex_unlock(&dqopt->dqonoff_mutex);
1875 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1876 toputinode[cnt] = NULL;
1877 if (type != -1 && cnt != type)
1879 if (!sb_has_quota_loaded(sb, cnt))
1882 if (flags & DQUOT_SUSPENDED) {
1883 spin_lock(&dq_state_lock);
1885 dquot_state_flag(DQUOT_SUSPENDED, cnt);
1886 spin_unlock(&dq_state_lock);
1888 spin_lock(&dq_state_lock);
1889 dqopt->flags &= ~dquot_state_flag(flags, cnt);
1890 /* Turning off suspended quotas? */
1891 if (!sb_has_quota_loaded(sb, cnt) &&
1892 sb_has_quota_suspended(sb, cnt)) {
1893 dqopt->flags &= ~dquot_state_flag(
1894 DQUOT_SUSPENDED, cnt);
1895 spin_unlock(&dq_state_lock);
1896 iput(dqopt->files[cnt]);
1897 dqopt->files[cnt] = NULL;
1900 spin_unlock(&dq_state_lock);
1903 /* We still have to keep quota loaded? */
1904 if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED))
1907 /* Note: these are blocking operations */
1908 drop_dquot_ref(sb, cnt);
1909 invalidate_dquots(sb, cnt);
1911 * Now all dquots should be invalidated, all writes done so we
1912 * should be only users of the info. No locks needed.
1914 if (info_dirty(&dqopt->info[cnt]))
1915 sb->dq_op->write_info(sb, cnt);
1916 if (dqopt->ops[cnt]->free_file_info)
1917 dqopt->ops[cnt]->free_file_info(sb, cnt);
1918 put_quota_format(dqopt->info[cnt].dqi_format);
1920 toputinode[cnt] = dqopt->files[cnt];
1921 if (!sb_has_quota_loaded(sb, cnt))
1922 dqopt->files[cnt] = NULL;
1923 dqopt->info[cnt].dqi_flags = 0;
1924 dqopt->info[cnt].dqi_igrace = 0;
1925 dqopt->info[cnt].dqi_bgrace = 0;
1926 dqopt->ops[cnt] = NULL;
1928 mutex_unlock(&dqopt->dqonoff_mutex);
1930 /* Skip syncing and setting flags if quota files are hidden */
1931 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
1934 /* Sync the superblock so that buffers with quota data are written to
1935 * disk (and so userspace sees correct data afterwards). */
1936 if (sb->s_op->sync_fs)
1937 sb->s_op->sync_fs(sb, 1);
1938 sync_blockdev(sb->s_bdev);
1939 /* Now the quota files are just ordinary files and we can set the
1940 * inode flags back. Moreover we discard the pagecache so that
1941 * userspace sees the writes we did bypassing the pagecache. We
1942 * must also discard the blockdev buffers so that we see the
1943 * changes done by userspace on the next quotaon() */
1944 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1945 if (toputinode[cnt]) {
1946 mutex_lock(&dqopt->dqonoff_mutex);
1947 /* If quota was reenabled in the meantime, we have
1949 if (!sb_has_quota_loaded(sb, cnt)) {
1950 mutex_lock_nested(&toputinode[cnt]->i_mutex,
1952 toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
1953 S_NOATIME | S_NOQUOTA);
1954 truncate_inode_pages(&toputinode[cnt]->i_data,
1956 mutex_unlock(&toputinode[cnt]->i_mutex);
1957 mark_inode_dirty(toputinode[cnt]);
1959 mutex_unlock(&dqopt->dqonoff_mutex);
1962 invalidate_bdev(sb->s_bdev);
1964 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1965 if (toputinode[cnt]) {
1966 /* On remount RO, we keep the inode pointer so that we
1967 * can reenable quota on the subsequent remount RW. We
1968 * have to check 'flags' variable and not use sb_has_
1969 * function because another quotaon / quotaoff could
1970 * change global state before we got here. We refuse
1971 * to suspend quotas when there is pending delete on
1972 * the quota file... */
1973 if (!(flags & DQUOT_SUSPENDED))
1974 iput(toputinode[cnt]);
1975 else if (!toputinode[cnt]->i_nlink)
1980 EXPORT_SYMBOL(dquot_disable);
1982 int dquot_quota_off(struct super_block *sb, int type)
1984 return dquot_disable(sb, type,
1985 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
1987 EXPORT_SYMBOL(dquot_quota_off);
1990 * Turn quotas on on a device
1994 * Helper function to turn quotas on when we already have the inode of
1995 * quota file and no quota information is loaded.
1997 static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
2000 struct quota_format_type *fmt = find_quota_format(format_id);
2001 struct super_block *sb = inode->i_sb;
2002 struct quota_info *dqopt = sb_dqopt(sb);
2008 if (!S_ISREG(inode->i_mode)) {
2012 if (IS_RDONLY(inode)) {
2016 if (!sb->s_op->quota_write || !sb->s_op->quota_read) {
2020 /* Usage always has to be set... */
2021 if (!(flags & DQUOT_USAGE_ENABLED)) {
2026 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2027 /* As we bypass the pagecache we must now flush all the
2028 * dirty data and invalidate caches so that kernel sees
2029 * changes from userspace. It is not enough to just flush
2030 * the quota file since if blocksize < pagesize, invalidation
2031 * of the cache could fail because of other unrelated dirty
2033 sync_filesystem(sb);
2034 invalidate_bdev(sb->s_bdev);
2036 mutex_lock(&dqopt->dqonoff_mutex);
2037 if (sb_has_quota_loaded(sb, type)) {
2042 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2043 /* We don't want quota and atime on quota files (deadlocks
2044 * possible) Also nobody should write to the file - we use
2045 * special IO operations which ignore the immutable bit. */
2046 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2047 oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE |
2049 inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
2050 mutex_unlock(&inode->i_mutex);
2052 * When S_NOQUOTA is set, remove dquot references as no more
2053 * references can be added
2055 __dquot_drop(inode);
2059 dqopt->files[type] = igrab(inode);
2060 if (!dqopt->files[type])
2063 if (!fmt->qf_ops->check_quota_file(sb, type))
2066 dqopt->ops[type] = fmt->qf_ops;
2067 dqopt->info[type].dqi_format = fmt;
2068 dqopt->info[type].dqi_fmt_id = format_id;
2069 INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
2070 mutex_lock(&dqopt->dqio_mutex);
2071 error = dqopt->ops[type]->read_file_info(sb, type);
2073 mutex_unlock(&dqopt->dqio_mutex);
2076 mutex_unlock(&dqopt->dqio_mutex);
2077 spin_lock(&dq_state_lock);
2078 dqopt->flags |= dquot_state_flag(flags, type);
2079 spin_unlock(&dq_state_lock);
2081 add_dquot_ref(sb, type);
2082 mutex_unlock(&dqopt->dqonoff_mutex);
2087 dqopt->files[type] = NULL;
2090 if (oldflags != -1) {
2091 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2092 /* Set the flags back (in the case of accidental quotaon()
2093 * on a wrong file we don't want to mess up the flags) */
2094 inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
2095 inode->i_flags |= oldflags;
2096 mutex_unlock(&inode->i_mutex);
2098 mutex_unlock(&dqopt->dqonoff_mutex);
2100 put_quota_format(fmt);
2105 /* Reenable quotas on remount RW */
2106 int dquot_resume(struct super_block *sb, int type)
2108 struct quota_info *dqopt = sb_dqopt(sb);
2109 struct inode *inode;
2113 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
2114 if (type != -1 && cnt != type)
2117 mutex_lock(&dqopt->dqonoff_mutex);
2118 if (!sb_has_quota_suspended(sb, cnt)) {
2119 mutex_unlock(&dqopt->dqonoff_mutex);
2122 inode = dqopt->files[cnt];
2123 dqopt->files[cnt] = NULL;
2124 spin_lock(&dq_state_lock);
2125 flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
2126 DQUOT_LIMITS_ENABLED,
2128 dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt);
2129 spin_unlock(&dq_state_lock);
2130 mutex_unlock(&dqopt->dqonoff_mutex);
2132 flags = dquot_generic_flag(flags, cnt);
2133 ret = vfs_load_quota_inode(inode, cnt,
2134 dqopt->info[cnt].dqi_fmt_id, flags);
2140 EXPORT_SYMBOL(dquot_resume);
2142 int dquot_quota_on_path(struct super_block *sb, int type, int format_id,
2145 int error = security_quota_on(path->dentry);
2148 /* Quota file not on the same filesystem? */
2149 if (path->mnt->mnt_sb != sb)
2152 error = vfs_load_quota_inode(path->dentry->d_inode, type,
2153 format_id, DQUOT_USAGE_ENABLED |
2154 DQUOT_LIMITS_ENABLED);
2157 EXPORT_SYMBOL(dquot_quota_on_path);
2159 int dquot_quota_on(struct super_block *sb, int type, int format_id, char *name)
2164 error = kern_path(name, LOOKUP_FOLLOW, &path);
2166 error = dquot_quota_on_path(sb, type, format_id, &path);
2171 EXPORT_SYMBOL(dquot_quota_on);
2174 * More powerful function for turning on quotas allowing setting
2175 * of individual quota flags
2177 int dquot_enable(struct inode *inode, int type, int format_id,
2181 struct super_block *sb = inode->i_sb;
2182 struct quota_info *dqopt = sb_dqopt(sb);
2184 /* Just unsuspend quotas? */
2185 BUG_ON(flags & DQUOT_SUSPENDED);
2189 /* Just updating flags needed? */
2190 if (sb_has_quota_loaded(sb, type)) {
2191 mutex_lock(&dqopt->dqonoff_mutex);
2192 /* Now do a reliable test... */
2193 if (!sb_has_quota_loaded(sb, type)) {
2194 mutex_unlock(&dqopt->dqonoff_mutex);
2197 if (flags & DQUOT_USAGE_ENABLED &&
2198 sb_has_quota_usage_enabled(sb, type)) {
2202 if (flags & DQUOT_LIMITS_ENABLED &&
2203 sb_has_quota_limits_enabled(sb, type)) {
2207 spin_lock(&dq_state_lock);
2208 sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
2209 spin_unlock(&dq_state_lock);
2211 mutex_unlock(&dqopt->dqonoff_mutex);
2216 return vfs_load_quota_inode(inode, type, format_id, flags);
2218 EXPORT_SYMBOL(dquot_enable);
2221 * This function is used when filesystem needs to initialize quotas
2222 * during mount time.
2224 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
2225 int format_id, int type)
2227 struct dentry *dentry;
2230 mutex_lock(&sb->s_root->d_inode->i_mutex);
2231 dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
2232 mutex_unlock(&sb->s_root->d_inode->i_mutex);
2234 return PTR_ERR(dentry);
2236 if (!dentry->d_inode) {
2241 error = security_quota_on(dentry);
2243 error = vfs_load_quota_inode(dentry->d_inode, type, format_id,
2244 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
2250 EXPORT_SYMBOL(dquot_quota_on_mount);
2252 static inline qsize_t qbtos(qsize_t blocks)
2254 return blocks << QIF_DQBLKSIZE_BITS;
2257 static inline qsize_t stoqb(qsize_t space)
2259 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
2262 /* Generic routine for getting common part of quota structure */
2263 static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di)
2265 struct mem_dqblk *dm = &dquot->dq_dqb;
2267 memset(di, 0, sizeof(*di));
2268 di->d_version = FS_DQUOT_VERSION;
2269 di->d_flags = dquot->dq_type == USRQUOTA ?
2270 XFS_USER_QUOTA : XFS_GROUP_QUOTA;
2271 di->d_id = dquot->dq_id;
2273 spin_lock(&dq_data_lock);
2274 di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit);
2275 di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit);
2276 di->d_ino_hardlimit = dm->dqb_ihardlimit;
2277 di->d_ino_softlimit = dm->dqb_isoftlimit;
2278 di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace;
2279 di->d_icount = dm->dqb_curinodes;
2280 di->d_btimer = dm->dqb_btime;
2281 di->d_itimer = dm->dqb_itime;
2282 spin_unlock(&dq_data_lock);
2285 int dquot_get_dqblk(struct super_block *sb, int type, qid_t id,
2286 struct fs_disk_quota *di)
2288 struct dquot *dquot;
2290 dquot = dqget(sb, id, type);
2293 do_get_dqblk(dquot, di);
2298 EXPORT_SYMBOL(dquot_get_dqblk);
2300 #define VFS_FS_DQ_MASK \
2301 (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \
2302 FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \
2303 FS_DQ_BTIMER | FS_DQ_ITIMER)
2305 /* Generic routine for setting common part of quota structure */
2306 static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *di)
2308 struct mem_dqblk *dm = &dquot->dq_dqb;
2309 int check_blim = 0, check_ilim = 0;
2310 struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
2312 if (di->d_fieldmask & ~VFS_FS_DQ_MASK)
2315 if (((di->d_fieldmask & FS_DQ_BSOFT) &&
2316 (di->d_blk_softlimit > dqi->dqi_maxblimit)) ||
2317 ((di->d_fieldmask & FS_DQ_BHARD) &&
2318 (di->d_blk_hardlimit > dqi->dqi_maxblimit)) ||
2319 ((di->d_fieldmask & FS_DQ_ISOFT) &&
2320 (di->d_ino_softlimit > dqi->dqi_maxilimit)) ||
2321 ((di->d_fieldmask & FS_DQ_IHARD) &&
2322 (di->d_ino_hardlimit > dqi->dqi_maxilimit)))
2325 spin_lock(&dq_data_lock);
2326 if (di->d_fieldmask & FS_DQ_BCOUNT) {
2327 dm->dqb_curspace = di->d_bcount - dm->dqb_rsvspace;
2329 set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
2332 if (di->d_fieldmask & FS_DQ_BSOFT)
2333 dm->dqb_bsoftlimit = qbtos(di->d_blk_softlimit);
2334 if (di->d_fieldmask & FS_DQ_BHARD)
2335 dm->dqb_bhardlimit = qbtos(di->d_blk_hardlimit);
2336 if (di->d_fieldmask & (FS_DQ_BSOFT | FS_DQ_BHARD)) {
2338 set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
2341 if (di->d_fieldmask & FS_DQ_ICOUNT) {
2342 dm->dqb_curinodes = di->d_icount;
2344 set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
2347 if (di->d_fieldmask & FS_DQ_ISOFT)
2348 dm->dqb_isoftlimit = di->d_ino_softlimit;
2349 if (di->d_fieldmask & FS_DQ_IHARD)
2350 dm->dqb_ihardlimit = di->d_ino_hardlimit;
2351 if (di->d_fieldmask & (FS_DQ_ISOFT | FS_DQ_IHARD)) {
2353 set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
2356 if (di->d_fieldmask & FS_DQ_BTIMER) {
2357 dm->dqb_btime = di->d_btimer;
2359 set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
2362 if (di->d_fieldmask & FS_DQ_ITIMER) {
2363 dm->dqb_itime = di->d_itimer;
2365 set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
2369 if (!dm->dqb_bsoftlimit ||
2370 dm->dqb_curspace < dm->dqb_bsoftlimit) {
2372 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
2373 } else if (!(di->d_fieldmask & FS_DQ_BTIMER))
2374 /* Set grace only if user hasn't provided his own... */
2375 dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
2378 if (!dm->dqb_isoftlimit ||
2379 dm->dqb_curinodes < dm->dqb_isoftlimit) {
2381 clear_bit(DQ_INODES_B, &dquot->dq_flags);
2382 } else if (!(di->d_fieldmask & FS_DQ_ITIMER))
2383 /* Set grace only if user hasn't provided his own... */
2384 dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
2386 if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit ||
2388 clear_bit(DQ_FAKE_B, &dquot->dq_flags);
2390 set_bit(DQ_FAKE_B, &dquot->dq_flags);
2391 spin_unlock(&dq_data_lock);
2392 mark_dquot_dirty(dquot);
2397 int dquot_set_dqblk(struct super_block *sb, int type, qid_t id,
2398 struct fs_disk_quota *di)
2400 struct dquot *dquot;
2403 dquot = dqget(sb, id, type);
2408 rc = do_set_dqblk(dquot, di);
2413 EXPORT_SYMBOL(dquot_set_dqblk);
2415 /* Generic routine for getting common part of quota file information */
2416 int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2418 struct mem_dqinfo *mi;
2420 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2421 if (!sb_has_quota_active(sb, type)) {
2422 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2425 mi = sb_dqopt(sb)->info + type;
2426 spin_lock(&dq_data_lock);
2427 ii->dqi_bgrace = mi->dqi_bgrace;
2428 ii->dqi_igrace = mi->dqi_igrace;
2429 ii->dqi_flags = mi->dqi_flags & DQF_MASK;
2430 ii->dqi_valid = IIF_ALL;
2431 spin_unlock(&dq_data_lock);
2432 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2435 EXPORT_SYMBOL(dquot_get_dqinfo);
2437 /* Generic routine for setting common part of quota file information */
2438 int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2440 struct mem_dqinfo *mi;
2443 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2444 if (!sb_has_quota_active(sb, type)) {
2448 mi = sb_dqopt(sb)->info + type;
2449 spin_lock(&dq_data_lock);
2450 if (ii->dqi_valid & IIF_BGRACE)
2451 mi->dqi_bgrace = ii->dqi_bgrace;
2452 if (ii->dqi_valid & IIF_IGRACE)
2453 mi->dqi_igrace = ii->dqi_igrace;
2454 if (ii->dqi_valid & IIF_FLAGS)
2455 mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) |
2456 (ii->dqi_flags & DQF_MASK);
2457 spin_unlock(&dq_data_lock);
2458 mark_info_dirty(sb, type);
2459 /* Force write to disk */
2460 sb->dq_op->write_info(sb, type);
2462 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2465 EXPORT_SYMBOL(dquot_set_dqinfo);
2467 const struct quotactl_ops dquot_quotactl_ops = {
2468 .quota_on = dquot_quota_on,
2469 .quota_off = dquot_quota_off,
2470 .quota_sync = dquot_quota_sync,
2471 .get_info = dquot_get_dqinfo,
2472 .set_info = dquot_set_dqinfo,
2473 .get_dqblk = dquot_get_dqblk,
2474 .set_dqblk = dquot_set_dqblk
2476 EXPORT_SYMBOL(dquot_quotactl_ops);
2478 static int do_proc_dqstats(struct ctl_table *table, int write,
2479 void __user *buffer, size_t *lenp, loff_t *ppos)
2481 unsigned int type = (int *)table->data - dqstats.stat;
2483 /* Update global table */
2484 dqstats.stat[type] =
2485 percpu_counter_sum_positive(&dqstats.counter[type]);
2486 return proc_dointvec(table, write, buffer, lenp, ppos);
2489 static ctl_table fs_dqstats_table[] = {
2491 .procname = "lookups",
2492 .data = &dqstats.stat[DQST_LOOKUPS],
2493 .maxlen = sizeof(int),
2495 .proc_handler = do_proc_dqstats,
2498 .procname = "drops",
2499 .data = &dqstats.stat[DQST_DROPS],
2500 .maxlen = sizeof(int),
2502 .proc_handler = do_proc_dqstats,
2505 .procname = "reads",
2506 .data = &dqstats.stat[DQST_READS],
2507 .maxlen = sizeof(int),
2509 .proc_handler = do_proc_dqstats,
2512 .procname = "writes",
2513 .data = &dqstats.stat[DQST_WRITES],
2514 .maxlen = sizeof(int),
2516 .proc_handler = do_proc_dqstats,
2519 .procname = "cache_hits",
2520 .data = &dqstats.stat[DQST_CACHE_HITS],
2521 .maxlen = sizeof(int),
2523 .proc_handler = do_proc_dqstats,
2526 .procname = "allocated_dquots",
2527 .data = &dqstats.stat[DQST_ALLOC_DQUOTS],
2528 .maxlen = sizeof(int),
2530 .proc_handler = do_proc_dqstats,
2533 .procname = "free_dquots",
2534 .data = &dqstats.stat[DQST_FREE_DQUOTS],
2535 .maxlen = sizeof(int),
2537 .proc_handler = do_proc_dqstats,
2540 .procname = "syncs",
2541 .data = &dqstats.stat[DQST_SYNCS],
2542 .maxlen = sizeof(int),
2544 .proc_handler = do_proc_dqstats,
2546 #ifdef CONFIG_PRINT_QUOTA_WARNING
2548 .procname = "warnings",
2549 .data = &flag_print_warnings,
2550 .maxlen = sizeof(int),
2552 .proc_handler = proc_dointvec,
2558 static ctl_table fs_table[] = {
2560 .procname = "quota",
2562 .child = fs_dqstats_table,
2567 static ctl_table sys_table[] = {
2576 static int __init dquot_init(void)
2579 unsigned long nr_hash, order;
2581 printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
2583 register_sysctl_table(sys_table);
2585 dquot_cachep = kmem_cache_create("dquot",
2586 sizeof(struct dquot), sizeof(unsigned long) * 4,
2587 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
2588 SLAB_MEM_SPREAD|SLAB_PANIC),
2592 dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
2594 panic("Cannot create dquot hash table");
2596 for (i = 0; i < _DQST_DQSTAT_LAST; i++) {
2597 ret = percpu_counter_init(&dqstats.counter[i], 0);
2599 panic("Cannot create dquot stat counters");
2602 /* Find power-of-two hlist_heads which can fit into allocation */
2603 nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
2607 } while (nr_hash >> dq_hash_bits);
2610 nr_hash = 1UL << dq_hash_bits;
2611 dq_hash_mask = nr_hash - 1;
2612 for (i = 0; i < nr_hash; i++)
2613 INIT_HLIST_HEAD(dquot_hash + i);
2615 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2616 nr_hash, order, (PAGE_SIZE << order));
2618 register_shrinker(&dqcache_shrinker);
2622 module_init(dquot_init);