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
85 * and quota formats, dqstats structure containing statistics about the lists
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.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.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.allocated_dquots++;
297 static inline void remove_inuse(struct dquot *dquot)
299 dqstats.allocated_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);
565 spin_unlock(&dq_list_lock);
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 vfs_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);
611 spin_unlock(&dq_list_lock);
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 spin_lock(&dq_list_lock);
625 spin_unlock(&dq_list_lock);
626 mutex_unlock(&dqopt->dqonoff_mutex);
628 if (!wait || (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE))
631 /* This is not very clever (and fast) but currently I don't know about
632 * any other simple way of getting quota data to disk and we must get
633 * them there for userspace to be visible... */
634 if (sb->s_op->sync_fs)
635 sb->s_op->sync_fs(sb, 1);
636 sync_blockdev(sb->s_bdev);
639 * Now when everything is written we can discard the pagecache so
640 * that userspace sees the changes.
642 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
643 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
644 if (type != -1 && cnt != type)
646 if (!sb_has_quota_active(sb, cnt))
648 mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex,
650 truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0);
651 mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex);
653 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
657 EXPORT_SYMBOL(vfs_quota_sync);
659 /* Free unused dquots from cache */
660 static void prune_dqcache(int count)
662 struct list_head *head;
665 head = free_dquots.prev;
666 while (head != &free_dquots && count) {
667 dquot = list_entry(head, struct dquot, dq_free);
668 remove_dquot_hash(dquot);
669 remove_free_dquot(dquot);
671 do_destroy_dquot(dquot);
673 head = free_dquots.prev;
678 * This is called from kswapd when we think we need some
682 static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
685 spin_lock(&dq_list_lock);
687 spin_unlock(&dq_list_lock);
689 return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure;
692 static struct shrinker dqcache_shrinker = {
693 .shrink = shrink_dqcache_memory,
694 .seeks = DEFAULT_SEEKS,
698 * Put reference to dquot
699 * NOTE: If you change this function please check whether dqput_blocks() works right...
701 void dqput(struct dquot *dquot)
707 #ifdef CONFIG_QUOTA_DEBUG
708 if (!atomic_read(&dquot->dq_count)) {
709 printk("VFS: dqput: trying to free free dquot\n");
710 printk("VFS: device %s, dquot of %s %d\n",
712 quotatypes[dquot->dq_type],
718 spin_lock(&dq_list_lock);
720 spin_unlock(&dq_list_lock);
722 spin_lock(&dq_list_lock);
723 if (atomic_read(&dquot->dq_count) > 1) {
724 /* We have more than one user... nothing to do */
725 atomic_dec(&dquot->dq_count);
726 /* Releasing dquot during quotaoff phase? */
727 if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) &&
728 atomic_read(&dquot->dq_count) == 1)
729 wake_up(&dquot->dq_wait_unused);
730 spin_unlock(&dq_list_lock);
733 /* Need to release dquot? */
734 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
735 spin_unlock(&dq_list_lock);
736 /* Commit dquot before releasing */
737 ret = dquot->dq_sb->dq_op->write_dquot(dquot);
739 printk(KERN_ERR "VFS: cannot write quota structure on "
740 "device %s (error %d). Quota may get out of "
741 "sync!\n", dquot->dq_sb->s_id, ret);
743 * We clear dirty bit anyway, so that we avoid
746 spin_lock(&dq_list_lock);
747 clear_dquot_dirty(dquot);
748 spin_unlock(&dq_list_lock);
752 /* Clear flag in case dquot was inactive (something bad happened) */
753 clear_dquot_dirty(dquot);
754 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
755 spin_unlock(&dq_list_lock);
756 dquot->dq_sb->dq_op->release_dquot(dquot);
759 atomic_dec(&dquot->dq_count);
760 #ifdef CONFIG_QUOTA_DEBUG
762 BUG_ON(!list_empty(&dquot->dq_free));
764 put_dquot_last(dquot);
765 spin_unlock(&dq_list_lock);
767 EXPORT_SYMBOL(dqput);
769 struct dquot *dquot_alloc(struct super_block *sb, int type)
771 return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
773 EXPORT_SYMBOL(dquot_alloc);
775 static struct dquot *get_empty_dquot(struct super_block *sb, int type)
779 dquot = sb->dq_op->alloc_dquot(sb, type);
783 mutex_init(&dquot->dq_lock);
784 INIT_LIST_HEAD(&dquot->dq_free);
785 INIT_LIST_HEAD(&dquot->dq_inuse);
786 INIT_HLIST_NODE(&dquot->dq_hash);
787 INIT_LIST_HEAD(&dquot->dq_dirty);
788 init_waitqueue_head(&dquot->dq_wait_unused);
790 dquot->dq_type = type;
791 atomic_set(&dquot->dq_count, 1);
797 * Get reference to dquot
799 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
800 * destroying our dquot by:
801 * a) checking for quota flags under dq_list_lock and
802 * b) getting a reference to dquot before we release dq_list_lock
804 struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
806 unsigned int hashent = hashfn(sb, id, type);
807 struct dquot *dquot = NULL, *empty = NULL;
809 if (!sb_has_quota_active(sb, type))
812 spin_lock(&dq_list_lock);
813 spin_lock(&dq_state_lock);
814 if (!sb_has_quota_active(sb, type)) {
815 spin_unlock(&dq_state_lock);
816 spin_unlock(&dq_list_lock);
819 spin_unlock(&dq_state_lock);
821 dquot = find_dquot(hashent, sb, id, type);
824 spin_unlock(&dq_list_lock);
825 empty = get_empty_dquot(sb, type);
827 schedule(); /* Try to wait for a moment... */
833 /* all dquots go on the inuse_list */
835 /* hash it first so it can be found */
836 insert_dquot_hash(dquot);
838 spin_unlock(&dq_list_lock);
840 if (!atomic_read(&dquot->dq_count))
841 remove_free_dquot(dquot);
842 atomic_inc(&dquot->dq_count);
843 dqstats.cache_hits++;
845 spin_unlock(&dq_list_lock);
847 /* Wait for dq_lock - after this we know that either dquot_release() is
848 * already finished or it will be canceled due to dq_count > 1 test */
849 wait_on_dquot(dquot);
850 /* Read the dquot / allocate space in quota file */
851 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) &&
852 sb->dq_op->acquire_dquot(dquot) < 0) {
857 #ifdef CONFIG_QUOTA_DEBUG
858 BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
862 do_destroy_dquot(empty);
866 EXPORT_SYMBOL(dqget);
868 static int dqinit_needed(struct inode *inode, int type)
872 if (IS_NOQUOTA(inode))
875 return !inode->i_dquot[type];
876 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
877 if (!inode->i_dquot[cnt])
882 /* This routine is guarded by dqonoff_mutex mutex */
883 static void add_dquot_ref(struct super_block *sb, int type)
885 struct inode *inode, *old_inode = NULL;
886 #ifdef CONFIG_QUOTA_DEBUG
890 spin_lock(&inode_lock);
891 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
892 if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE|I_NEW))
894 #ifdef CONFIG_QUOTA_DEBUG
895 if (unlikely(inode_get_rsv_space(inode) > 0))
898 if (!atomic_read(&inode->i_writecount))
900 if (!dqinit_needed(inode, type))
904 spin_unlock(&inode_lock);
907 __dquot_initialize(inode, type);
908 /* We hold a reference to 'inode' so it couldn't have been
909 * removed from s_inodes list while we dropped the inode_lock.
910 * We cannot iput the inode now as we can be holding the last
911 * reference and we cannot iput it under inode_lock. So we
912 * keep the reference and iput it later. */
914 spin_lock(&inode_lock);
916 spin_unlock(&inode_lock);
919 #ifdef CONFIG_QUOTA_DEBUG
921 printk(KERN_WARNING "VFS (%s): Writes happened before quota"
922 " was turned on thus quota information is probably "
923 "inconsistent. Please run quotacheck(8).\n", sb->s_id);
929 * Return 0 if dqput() won't block.
930 * (note that 1 doesn't necessarily mean blocking)
932 static inline int dqput_blocks(struct dquot *dquot)
934 if (atomic_read(&dquot->dq_count) <= 1)
940 * Remove references to dquots from inode and add dquot to list for freeing
941 * if we have the last referece to dquot
942 * We can't race with anybody because we hold dqptr_sem for writing...
944 static int remove_inode_dquot_ref(struct inode *inode, int type,
945 struct list_head *tofree_head)
947 struct dquot *dquot = inode->i_dquot[type];
949 inode->i_dquot[type] = NULL;
951 if (dqput_blocks(dquot)) {
952 #ifdef CONFIG_QUOTA_DEBUG
953 if (atomic_read(&dquot->dq_count) != 1)
954 printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count));
956 spin_lock(&dq_list_lock);
957 /* As dquot must have currently users it can't be on
958 * the free list... */
959 list_add(&dquot->dq_free, tofree_head);
960 spin_unlock(&dq_list_lock);
964 dqput(dquot); /* We have guaranteed we won't block */
970 * Free list of dquots
971 * Dquots are removed from inodes and no new references can be got so we are
972 * the only ones holding reference
974 static void put_dquot_list(struct list_head *tofree_head)
976 struct list_head *act_head;
979 act_head = tofree_head->next;
980 while (act_head != tofree_head) {
981 dquot = list_entry(act_head, struct dquot, dq_free);
982 act_head = act_head->next;
983 /* Remove dquot from the list so we won't have problems... */
984 list_del_init(&dquot->dq_free);
989 static void remove_dquot_ref(struct super_block *sb, int type,
990 struct list_head *tofree_head)
994 spin_lock(&inode_lock);
995 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
997 * We have to scan also I_NEW inodes because they can already
998 * have quota pointer initialized. Luckily, we need to touch
999 * only quota pointers and these have separate locking
1002 if (!IS_NOQUOTA(inode))
1003 remove_inode_dquot_ref(inode, type, tofree_head);
1005 spin_unlock(&inode_lock);
1008 /* Gather all references from inodes and drop them */
1009 static void drop_dquot_ref(struct super_block *sb, int type)
1011 LIST_HEAD(tofree_head);
1014 down_write(&sb_dqopt(sb)->dqptr_sem);
1015 remove_dquot_ref(sb, type, &tofree_head);
1016 up_write(&sb_dqopt(sb)->dqptr_sem);
1017 put_dquot_list(&tofree_head);
1021 static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
1023 dquot->dq_dqb.dqb_curinodes += number;
1026 static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
1028 dquot->dq_dqb.dqb_curspace += number;
1031 static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
1033 dquot->dq_dqb.dqb_rsvspace += number;
1037 * Claim reserved quota space
1039 static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number)
1041 if (dquot->dq_dqb.dqb_rsvspace < number) {
1043 number = dquot->dq_dqb.dqb_rsvspace;
1045 dquot->dq_dqb.dqb_curspace += number;
1046 dquot->dq_dqb.dqb_rsvspace -= number;
1050 void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
1052 if (dquot->dq_dqb.dqb_rsvspace >= number)
1053 dquot->dq_dqb.dqb_rsvspace -= number;
1056 dquot->dq_dqb.dqb_rsvspace = 0;
1060 static void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
1062 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
1063 dquot->dq_dqb.dqb_curinodes >= number)
1064 dquot->dq_dqb.dqb_curinodes -= number;
1066 dquot->dq_dqb.dqb_curinodes = 0;
1067 if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
1068 dquot->dq_dqb.dqb_itime = (time_t) 0;
1069 clear_bit(DQ_INODES_B, &dquot->dq_flags);
1072 static void dquot_decr_space(struct dquot *dquot, qsize_t number)
1074 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
1075 dquot->dq_dqb.dqb_curspace >= number)
1076 dquot->dq_dqb.dqb_curspace -= number;
1078 dquot->dq_dqb.dqb_curspace = 0;
1079 if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
1080 dquot->dq_dqb.dqb_btime = (time_t) 0;
1081 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
1084 static int warning_issued(struct dquot *dquot, const int warntype)
1086 int flag = (warntype == QUOTA_NL_BHARDWARN ||
1087 warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
1088 ((warntype == QUOTA_NL_IHARDWARN ||
1089 warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
1093 return test_and_set_bit(flag, &dquot->dq_flags);
1096 #ifdef CONFIG_PRINT_QUOTA_WARNING
1097 static int flag_print_warnings = 1;
1099 static int need_print_warning(struct dquot *dquot)
1101 if (!flag_print_warnings)
1104 switch (dquot->dq_type) {
1106 return current_fsuid() == dquot->dq_id;
1108 return in_group_p(dquot->dq_id);
1113 /* Print warning to user which exceeded quota */
1114 static void print_warning(struct dquot *dquot, const int warntype)
1117 struct tty_struct *tty;
1119 if (warntype == QUOTA_NL_IHARDBELOW ||
1120 warntype == QUOTA_NL_ISOFTBELOW ||
1121 warntype == QUOTA_NL_BHARDBELOW ||
1122 warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot))
1125 tty = get_current_tty();
1128 tty_write_message(tty, dquot->dq_sb->s_id);
1129 if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
1130 tty_write_message(tty, ": warning, ");
1132 tty_write_message(tty, ": write failed, ");
1133 tty_write_message(tty, quotatypes[dquot->dq_type]);
1135 case QUOTA_NL_IHARDWARN:
1136 msg = " file limit reached.\r\n";
1138 case QUOTA_NL_ISOFTLONGWARN:
1139 msg = " file quota exceeded too long.\r\n";
1141 case QUOTA_NL_ISOFTWARN:
1142 msg = " file quota exceeded.\r\n";
1144 case QUOTA_NL_BHARDWARN:
1145 msg = " block limit reached.\r\n";
1147 case QUOTA_NL_BSOFTLONGWARN:
1148 msg = " block quota exceeded too long.\r\n";
1150 case QUOTA_NL_BSOFTWARN:
1151 msg = " block quota exceeded.\r\n";
1154 tty_write_message(tty, msg);
1160 * Write warnings to the console and send warning messages over netlink.
1162 * Note that this function can sleep.
1164 static void flush_warnings(struct dquot *const *dquots, char *warntype)
1169 for (i = 0; i < MAXQUOTAS; i++) {
1171 if (dq && warntype[i] != QUOTA_NL_NOWARN &&
1172 !warning_issued(dq, warntype[i])) {
1173 #ifdef CONFIG_PRINT_QUOTA_WARNING
1174 print_warning(dq, warntype[i]);
1176 quota_send_warning(dq->dq_type, dq->dq_id,
1177 dq->dq_sb->s_dev, warntype[i]);
1182 static int ignore_hardlimit(struct dquot *dquot)
1184 struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
1186 return capable(CAP_SYS_RESOURCE) &&
1187 (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD ||
1188 !(info->dqi_flags & V1_DQF_RSQUASH));
1191 /* needs dq_data_lock */
1192 static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype)
1194 qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes;
1196 *warntype = QUOTA_NL_NOWARN;
1197 if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
1198 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1201 if (dquot->dq_dqb.dqb_ihardlimit &&
1202 newinodes > dquot->dq_dqb.dqb_ihardlimit &&
1203 !ignore_hardlimit(dquot)) {
1204 *warntype = QUOTA_NL_IHARDWARN;
1208 if (dquot->dq_dqb.dqb_isoftlimit &&
1209 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1210 dquot->dq_dqb.dqb_itime &&
1211 get_seconds() >= dquot->dq_dqb.dqb_itime &&
1212 !ignore_hardlimit(dquot)) {
1213 *warntype = QUOTA_NL_ISOFTLONGWARN;
1217 if (dquot->dq_dqb.dqb_isoftlimit &&
1218 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1219 dquot->dq_dqb.dqb_itime == 0) {
1220 *warntype = QUOTA_NL_ISOFTWARN;
1221 dquot->dq_dqb.dqb_itime = get_seconds() +
1222 sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
1228 /* needs dq_data_lock */
1229 static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype)
1232 struct super_block *sb = dquot->dq_sb;
1234 *warntype = QUOTA_NL_NOWARN;
1235 if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) ||
1236 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1239 tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace
1242 if (dquot->dq_dqb.dqb_bhardlimit &&
1243 tspace > dquot->dq_dqb.dqb_bhardlimit &&
1244 !ignore_hardlimit(dquot)) {
1246 *warntype = QUOTA_NL_BHARDWARN;
1250 if (dquot->dq_dqb.dqb_bsoftlimit &&
1251 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
1252 dquot->dq_dqb.dqb_btime &&
1253 get_seconds() >= dquot->dq_dqb.dqb_btime &&
1254 !ignore_hardlimit(dquot)) {
1256 *warntype = QUOTA_NL_BSOFTLONGWARN;
1260 if (dquot->dq_dqb.dqb_bsoftlimit &&
1261 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
1262 dquot->dq_dqb.dqb_btime == 0) {
1264 *warntype = QUOTA_NL_BSOFTWARN;
1265 dquot->dq_dqb.dqb_btime = get_seconds() +
1266 sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace;
1270 * We don't allow preallocation to exceed softlimit so exceeding will
1279 static int info_idq_free(struct dquot *dquot, qsize_t inodes)
1283 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1284 dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit ||
1285 !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type))
1286 return QUOTA_NL_NOWARN;
1288 newinodes = dquot->dq_dqb.dqb_curinodes - inodes;
1289 if (newinodes <= dquot->dq_dqb.dqb_isoftlimit)
1290 return QUOTA_NL_ISOFTBELOW;
1291 if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
1292 newinodes < dquot->dq_dqb.dqb_ihardlimit)
1293 return QUOTA_NL_IHARDBELOW;
1294 return QUOTA_NL_NOWARN;
1297 static int info_bdq_free(struct dquot *dquot, qsize_t space)
1299 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1300 dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
1301 return QUOTA_NL_NOWARN;
1303 if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit)
1304 return QUOTA_NL_BSOFTBELOW;
1305 if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit &&
1306 dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit)
1307 return QUOTA_NL_BHARDBELOW;
1308 return QUOTA_NL_NOWARN;
1312 * Initialize quota pointers in inode
1314 * We do things in a bit complicated way but by that we avoid calling
1315 * dqget() and thus filesystem callbacks under dqptr_sem.
1317 * It is better to call this function outside of any transaction as it
1318 * might need a lot of space in journal for dquot structure allocation.
1320 static void __dquot_initialize(struct inode *inode, int type)
1322 unsigned int id = 0;
1324 struct dquot *got[MAXQUOTAS];
1325 struct super_block *sb = inode->i_sb;
1328 /* First test before acquiring mutex - solves deadlocks when we
1329 * re-enter the quota code and are already holding the mutex */
1330 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode))
1333 /* First get references to structures we might need. */
1334 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1336 if (type != -1 && cnt != type)
1346 got[cnt] = dqget(sb, id, cnt);
1349 down_write(&sb_dqopt(sb)->dqptr_sem);
1350 if (IS_NOQUOTA(inode))
1352 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1353 if (type != -1 && cnt != type)
1355 /* Avoid races with quotaoff() */
1356 if (!sb_has_quota_active(sb, cnt))
1358 if (!inode->i_dquot[cnt]) {
1359 inode->i_dquot[cnt] = got[cnt];
1362 * Make quota reservation system happy if someone
1363 * did a write before quota was turned on
1365 rsv = inode_get_rsv_space(inode);
1367 dquot_resv_space(inode->i_dquot[cnt], rsv);
1371 up_write(&sb_dqopt(sb)->dqptr_sem);
1372 /* Drop unused references */
1376 void dquot_initialize(struct inode *inode)
1378 __dquot_initialize(inode, -1);
1380 EXPORT_SYMBOL(dquot_initialize);
1383 * Release all quotas referenced by inode
1385 static void __dquot_drop(struct inode *inode)
1388 struct dquot *put[MAXQUOTAS];
1390 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1391 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1392 put[cnt] = inode->i_dquot[cnt];
1393 inode->i_dquot[cnt] = NULL;
1395 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1399 void dquot_drop(struct inode *inode)
1403 if (IS_NOQUOTA(inode))
1407 * Test before calling to rule out calls from proc and such
1408 * where we are not allowed to block. Note that this is
1409 * actually reliable test even without the lock - the caller
1410 * must assure that nobody can come after the DQUOT_DROP and
1411 * add quota pointers back anyway.
1413 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1414 if (inode->i_dquot[cnt])
1418 if (cnt < MAXQUOTAS)
1419 __dquot_drop(inode);
1421 EXPORT_SYMBOL(dquot_drop);
1424 * inode_reserved_space is managed internally by quota, and protected by
1425 * i_lock similar to i_blocks+i_bytes.
1427 static qsize_t *inode_reserved_space(struct inode * inode)
1429 /* Filesystem must explicitly define it's own method in order to use
1430 * quota reservation interface */
1431 BUG_ON(!inode->i_sb->dq_op->get_reserved_space);
1432 return inode->i_sb->dq_op->get_reserved_space(inode);
1435 void inode_add_rsv_space(struct inode *inode, qsize_t number)
1437 spin_lock(&inode->i_lock);
1438 *inode_reserved_space(inode) += number;
1439 spin_unlock(&inode->i_lock);
1441 EXPORT_SYMBOL(inode_add_rsv_space);
1443 void inode_claim_rsv_space(struct inode *inode, qsize_t number)
1445 spin_lock(&inode->i_lock);
1446 *inode_reserved_space(inode) -= number;
1447 __inode_add_bytes(inode, number);
1448 spin_unlock(&inode->i_lock);
1450 EXPORT_SYMBOL(inode_claim_rsv_space);
1452 void inode_sub_rsv_space(struct inode *inode, qsize_t number)
1454 spin_lock(&inode->i_lock);
1455 *inode_reserved_space(inode) -= number;
1456 spin_unlock(&inode->i_lock);
1458 EXPORT_SYMBOL(inode_sub_rsv_space);
1460 static qsize_t inode_get_rsv_space(struct inode *inode)
1464 if (!inode->i_sb->dq_op->get_reserved_space)
1466 spin_lock(&inode->i_lock);
1467 ret = *inode_reserved_space(inode);
1468 spin_unlock(&inode->i_lock);
1472 static void inode_incr_space(struct inode *inode, qsize_t number,
1476 inode_add_rsv_space(inode, number);
1478 inode_add_bytes(inode, number);
1481 static void inode_decr_space(struct inode *inode, qsize_t number, int reserve)
1484 inode_sub_rsv_space(inode, number);
1486 inode_sub_bytes(inode, number);
1490 * This functions updates i_blocks+i_bytes fields and quota information
1491 * (together with appropriate checks).
1493 * NOTE: We absolutely rely on the fact that caller dirties the inode
1494 * (usually helpers in quotaops.h care about this) and holds a handle for
1495 * the current transaction so that dquot write and inode write go into the
1500 * This operation can block, but only after everything is updated
1502 int __dquot_alloc_space(struct inode *inode, qsize_t number,
1503 int warn, int reserve)
1506 char warntype[MAXQUOTAS];
1509 * First test before acquiring mutex - solves deadlocks when we
1510 * re-enter the quota code and are already holding the mutex
1512 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) {
1513 inode_incr_space(inode, number, reserve);
1517 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1518 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1519 warntype[cnt] = QUOTA_NL_NOWARN;
1521 spin_lock(&dq_data_lock);
1522 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1523 if (!inode->i_dquot[cnt])
1525 ret = check_bdq(inode->i_dquot[cnt], number, !warn,
1528 spin_unlock(&dq_data_lock);
1529 goto out_flush_warn;
1532 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1533 if (!inode->i_dquot[cnt])
1536 dquot_resv_space(inode->i_dquot[cnt], number);
1538 dquot_incr_space(inode->i_dquot[cnt], number);
1540 inode_incr_space(inode, number, reserve);
1541 spin_unlock(&dq_data_lock);
1544 goto out_flush_warn;
1545 mark_all_dquot_dirty(inode->i_dquot);
1547 flush_warnings(inode->i_dquot, warntype);
1548 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1552 EXPORT_SYMBOL(__dquot_alloc_space);
1555 * This operation can block, but only after everything is updated
1557 int dquot_alloc_inode(const struct inode *inode)
1560 char warntype[MAXQUOTAS];
1562 /* First test before acquiring mutex - solves deadlocks when we
1563 * re-enter the quota code and are already holding the mutex */
1564 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode))
1566 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1567 warntype[cnt] = QUOTA_NL_NOWARN;
1568 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1569 spin_lock(&dq_data_lock);
1570 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1571 if (!inode->i_dquot[cnt])
1573 ret = check_idq(inode->i_dquot[cnt], 1, warntype + cnt);
1578 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1579 if (!inode->i_dquot[cnt])
1581 dquot_incr_inodes(inode->i_dquot[cnt], 1);
1585 spin_unlock(&dq_data_lock);
1587 mark_all_dquot_dirty(inode->i_dquot);
1588 flush_warnings(inode->i_dquot, warntype);
1589 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1592 EXPORT_SYMBOL(dquot_alloc_inode);
1595 * Convert in-memory reserved quotas to real consumed quotas
1597 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
1601 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) {
1602 inode_claim_rsv_space(inode, number);
1606 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1607 spin_lock(&dq_data_lock);
1608 /* Claim reserved quotas to allocated quotas */
1609 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1610 if (inode->i_dquot[cnt])
1611 dquot_claim_reserved_space(inode->i_dquot[cnt],
1614 /* Update inode bytes */
1615 inode_claim_rsv_space(inode, number);
1616 spin_unlock(&dq_data_lock);
1617 mark_all_dquot_dirty(inode->i_dquot);
1618 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1621 EXPORT_SYMBOL(dquot_claim_space_nodirty);
1624 * This operation can block, but only after everything is updated
1626 void __dquot_free_space(struct inode *inode, qsize_t number, int reserve)
1629 char warntype[MAXQUOTAS];
1631 /* First test before acquiring mutex - solves deadlocks when we
1632 * re-enter the quota code and are already holding the mutex */
1633 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) {
1634 inode_decr_space(inode, number, reserve);
1638 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1639 spin_lock(&dq_data_lock);
1640 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1641 if (!inode->i_dquot[cnt])
1643 warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number);
1645 dquot_free_reserved_space(inode->i_dquot[cnt], number);
1647 dquot_decr_space(inode->i_dquot[cnt], number);
1649 inode_decr_space(inode, number, reserve);
1650 spin_unlock(&dq_data_lock);
1654 mark_all_dquot_dirty(inode->i_dquot);
1656 flush_warnings(inode->i_dquot, warntype);
1657 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1659 EXPORT_SYMBOL(__dquot_free_space);
1662 * This operation can block, but only after everything is updated
1664 void dquot_free_inode(const struct inode *inode)
1667 char warntype[MAXQUOTAS];
1669 /* First test before acquiring mutex - solves deadlocks when we
1670 * re-enter the quota code and are already holding the mutex */
1671 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode))
1674 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1675 spin_lock(&dq_data_lock);
1676 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1677 if (!inode->i_dquot[cnt])
1679 warntype[cnt] = info_idq_free(inode->i_dquot[cnt], 1);
1680 dquot_decr_inodes(inode->i_dquot[cnt], 1);
1682 spin_unlock(&dq_data_lock);
1683 mark_all_dquot_dirty(inode->i_dquot);
1684 flush_warnings(inode->i_dquot, warntype);
1685 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1687 EXPORT_SYMBOL(dquot_free_inode);
1690 * Transfer the number of inode and blocks from one diskquota to an other.
1692 * This operation can block, but only after everything is updated
1693 * A transaction must be started when entering this function.
1695 static int __dquot_transfer(struct inode *inode, qid_t *chid, unsigned long mask)
1697 qsize_t space, cur_space;
1698 qsize_t rsv_space = 0;
1699 struct dquot *transfer_from[MAXQUOTAS];
1700 struct dquot *transfer_to[MAXQUOTAS];
1702 char warntype_to[MAXQUOTAS];
1703 char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS];
1705 /* First test before acquiring mutex - solves deadlocks when we
1706 * re-enter the quota code and are already holding the mutex */
1707 if (IS_NOQUOTA(inode))
1709 /* Initialize the arrays */
1710 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1711 transfer_from[cnt] = NULL;
1712 transfer_to[cnt] = NULL;
1713 warntype_to[cnt] = QUOTA_NL_NOWARN;
1715 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1716 if (mask & (1 << cnt))
1717 transfer_to[cnt] = dqget(inode->i_sb, chid[cnt], cnt);
1719 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1720 if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
1721 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1724 spin_lock(&dq_data_lock);
1725 cur_space = inode_get_bytes(inode);
1726 rsv_space = inode_get_rsv_space(inode);
1727 space = cur_space + rsv_space;
1728 /* Build the transfer_from list and check the limits */
1729 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1730 if (!transfer_to[cnt])
1732 transfer_from[cnt] = inode->i_dquot[cnt];
1733 ret = check_idq(transfer_to[cnt], 1, warntype_to + cnt);
1736 ret = check_bdq(transfer_to[cnt], space, 0, warntype_to + cnt);
1742 * Finally perform the needed transfer from transfer_from to transfer_to
1744 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1746 * Skip changes for same uid or gid or for turned off quota-type.
1748 if (!transfer_to[cnt])
1751 /* Due to IO error we might not have transfer_from[] structure */
1752 if (transfer_from[cnt]) {
1753 warntype_from_inodes[cnt] =
1754 info_idq_free(transfer_from[cnt], 1);
1755 warntype_from_space[cnt] =
1756 info_bdq_free(transfer_from[cnt], space);
1757 dquot_decr_inodes(transfer_from[cnt], 1);
1758 dquot_decr_space(transfer_from[cnt], cur_space);
1759 dquot_free_reserved_space(transfer_from[cnt],
1763 dquot_incr_inodes(transfer_to[cnt], 1);
1764 dquot_incr_space(transfer_to[cnt], cur_space);
1765 dquot_resv_space(transfer_to[cnt], rsv_space);
1767 inode->i_dquot[cnt] = transfer_to[cnt];
1769 spin_unlock(&dq_data_lock);
1770 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1772 mark_all_dquot_dirty(transfer_from);
1773 mark_all_dquot_dirty(transfer_to);
1774 /* The reference we got is transferred to the inode */
1775 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1776 transfer_to[cnt] = NULL;
1778 flush_warnings(transfer_to, warntype_to);
1779 flush_warnings(transfer_from, warntype_from_inodes);
1780 flush_warnings(transfer_from, warntype_from_space);
1782 dqput_all(transfer_from);
1783 dqput_all(transfer_to);
1786 spin_unlock(&dq_data_lock);
1787 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1788 /* Clear dquot pointers we don't want to dqput() */
1789 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1790 transfer_from[cnt] = NULL;
1794 /* Wrapper for transferring ownership of an inode for uid/gid only
1795 * Called from FSXXX_setattr()
1797 int dquot_transfer(struct inode *inode, struct iattr *iattr)
1799 qid_t chid[MAXQUOTAS];
1800 unsigned long mask = 0;
1802 if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) {
1803 mask |= 1 << USRQUOTA;
1804 chid[USRQUOTA] = iattr->ia_uid;
1806 if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid) {
1807 mask |= 1 << GRPQUOTA;
1808 chid[GRPQUOTA] = iattr->ia_gid;
1810 if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) {
1811 dquot_initialize(inode);
1812 return __dquot_transfer(inode, chid, mask);
1816 EXPORT_SYMBOL(dquot_transfer);
1819 * Write info of quota file to disk
1821 int dquot_commit_info(struct super_block *sb, int type)
1824 struct quota_info *dqopt = sb_dqopt(sb);
1826 mutex_lock(&dqopt->dqio_mutex);
1827 ret = dqopt->ops[type]->write_file_info(sb, type);
1828 mutex_unlock(&dqopt->dqio_mutex);
1831 EXPORT_SYMBOL(dquot_commit_info);
1834 * Definitions of diskquota operations.
1836 const struct dquot_operations dquot_operations = {
1837 .write_dquot = dquot_commit,
1838 .acquire_dquot = dquot_acquire,
1839 .release_dquot = dquot_release,
1840 .mark_dirty = dquot_mark_dquot_dirty,
1841 .write_info = dquot_commit_info,
1842 .alloc_dquot = dquot_alloc,
1843 .destroy_dquot = dquot_destroy,
1847 * Generic helper for ->open on filesystems supporting disk quotas.
1849 int dquot_file_open(struct inode *inode, struct file *file)
1853 error = generic_file_open(inode, file);
1854 if (!error && (file->f_mode & FMODE_WRITE))
1855 dquot_initialize(inode);
1858 EXPORT_SYMBOL(dquot_file_open);
1861 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1863 int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags)
1866 struct quota_info *dqopt = sb_dqopt(sb);
1867 struct inode *toputinode[MAXQUOTAS];
1869 /* Cannot turn off usage accounting without turning off limits, or
1870 * suspend quotas and simultaneously turn quotas off. */
1871 if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED))
1872 || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED |
1873 DQUOT_USAGE_ENABLED)))
1876 /* We need to serialize quota_off() for device */
1877 mutex_lock(&dqopt->dqonoff_mutex);
1880 * Skip everything if there's nothing to do. We have to do this because
1881 * sometimes we are called when fill_super() failed and calling
1882 * sync_fs() in such cases does no good.
1884 if (!sb_any_quota_loaded(sb)) {
1885 mutex_unlock(&dqopt->dqonoff_mutex);
1888 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1889 toputinode[cnt] = NULL;
1890 if (type != -1 && cnt != type)
1892 if (!sb_has_quota_loaded(sb, cnt))
1895 if (flags & DQUOT_SUSPENDED) {
1896 spin_lock(&dq_state_lock);
1898 dquot_state_flag(DQUOT_SUSPENDED, cnt);
1899 spin_unlock(&dq_state_lock);
1901 spin_lock(&dq_state_lock);
1902 dqopt->flags &= ~dquot_state_flag(flags, cnt);
1903 /* Turning off suspended quotas? */
1904 if (!sb_has_quota_loaded(sb, cnt) &&
1905 sb_has_quota_suspended(sb, cnt)) {
1906 dqopt->flags &= ~dquot_state_flag(
1907 DQUOT_SUSPENDED, cnt);
1908 spin_unlock(&dq_state_lock);
1909 iput(dqopt->files[cnt]);
1910 dqopt->files[cnt] = NULL;
1913 spin_unlock(&dq_state_lock);
1916 /* We still have to keep quota loaded? */
1917 if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED))
1920 /* Note: these are blocking operations */
1921 drop_dquot_ref(sb, cnt);
1922 invalidate_dquots(sb, cnt);
1924 * Now all dquots should be invalidated, all writes done so we
1925 * should be only users of the info. No locks needed.
1927 if (info_dirty(&dqopt->info[cnt]))
1928 sb->dq_op->write_info(sb, cnt);
1929 if (dqopt->ops[cnt]->free_file_info)
1930 dqopt->ops[cnt]->free_file_info(sb, cnt);
1931 put_quota_format(dqopt->info[cnt].dqi_format);
1933 toputinode[cnt] = dqopt->files[cnt];
1934 if (!sb_has_quota_loaded(sb, cnt))
1935 dqopt->files[cnt] = NULL;
1936 dqopt->info[cnt].dqi_flags = 0;
1937 dqopt->info[cnt].dqi_igrace = 0;
1938 dqopt->info[cnt].dqi_bgrace = 0;
1939 dqopt->ops[cnt] = NULL;
1941 mutex_unlock(&dqopt->dqonoff_mutex);
1943 /* Skip syncing and setting flags if quota files are hidden */
1944 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
1947 /* Sync the superblock so that buffers with quota data are written to
1948 * disk (and so userspace sees correct data afterwards). */
1949 if (sb->s_op->sync_fs)
1950 sb->s_op->sync_fs(sb, 1);
1951 sync_blockdev(sb->s_bdev);
1952 /* Now the quota files are just ordinary files and we can set the
1953 * inode flags back. Moreover we discard the pagecache so that
1954 * userspace sees the writes we did bypassing the pagecache. We
1955 * must also discard the blockdev buffers so that we see the
1956 * changes done by userspace on the next quotaon() */
1957 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1958 if (toputinode[cnt]) {
1959 mutex_lock(&dqopt->dqonoff_mutex);
1960 /* If quota was reenabled in the meantime, we have
1962 if (!sb_has_quota_loaded(sb, cnt)) {
1963 mutex_lock_nested(&toputinode[cnt]->i_mutex,
1965 toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
1966 S_NOATIME | S_NOQUOTA);
1967 truncate_inode_pages(&toputinode[cnt]->i_data,
1969 mutex_unlock(&toputinode[cnt]->i_mutex);
1970 mark_inode_dirty(toputinode[cnt]);
1972 mutex_unlock(&dqopt->dqonoff_mutex);
1975 invalidate_bdev(sb->s_bdev);
1977 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1978 if (toputinode[cnt]) {
1979 /* On remount RO, we keep the inode pointer so that we
1980 * can reenable quota on the subsequent remount RW. We
1981 * have to check 'flags' variable and not use sb_has_
1982 * function because another quotaon / quotaoff could
1983 * change global state before we got here. We refuse
1984 * to suspend quotas when there is pending delete on
1985 * the quota file... */
1986 if (!(flags & DQUOT_SUSPENDED))
1987 iput(toputinode[cnt]);
1988 else if (!toputinode[cnt]->i_nlink)
1993 EXPORT_SYMBOL(vfs_quota_disable);
1995 int vfs_quota_off(struct super_block *sb, int type, int remount)
1997 return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED :
1998 (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED));
2000 EXPORT_SYMBOL(vfs_quota_off);
2002 * Turn quotas on on a device
2006 * Helper function to turn quotas on when we already have the inode of
2007 * quota file and no quota information is loaded.
2009 static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
2012 struct quota_format_type *fmt = find_quota_format(format_id);
2013 struct super_block *sb = inode->i_sb;
2014 struct quota_info *dqopt = sb_dqopt(sb);
2020 if (!S_ISREG(inode->i_mode)) {
2024 if (IS_RDONLY(inode)) {
2028 if (!sb->s_op->quota_write || !sb->s_op->quota_read) {
2032 /* Usage always has to be set... */
2033 if (!(flags & DQUOT_USAGE_ENABLED)) {
2038 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2039 /* As we bypass the pagecache we must now flush all the
2040 * dirty data and invalidate caches so that kernel sees
2041 * changes from userspace. It is not enough to just flush
2042 * the quota file since if blocksize < pagesize, invalidation
2043 * of the cache could fail because of other unrelated dirty
2045 sync_filesystem(sb);
2046 invalidate_bdev(sb->s_bdev);
2048 mutex_lock(&dqopt->dqonoff_mutex);
2049 if (sb_has_quota_loaded(sb, type)) {
2054 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2055 /* We don't want quota and atime on quota files (deadlocks
2056 * possible) Also nobody should write to the file - we use
2057 * special IO operations which ignore the immutable bit. */
2058 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2059 oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE |
2061 inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
2062 mutex_unlock(&inode->i_mutex);
2064 * When S_NOQUOTA is set, remove dquot references as no more
2065 * references can be added
2067 __dquot_drop(inode);
2071 dqopt->files[type] = igrab(inode);
2072 if (!dqopt->files[type])
2075 if (!fmt->qf_ops->check_quota_file(sb, type))
2078 dqopt->ops[type] = fmt->qf_ops;
2079 dqopt->info[type].dqi_format = fmt;
2080 dqopt->info[type].dqi_fmt_id = format_id;
2081 INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
2082 mutex_lock(&dqopt->dqio_mutex);
2083 error = dqopt->ops[type]->read_file_info(sb, type);
2085 mutex_unlock(&dqopt->dqio_mutex);
2088 mutex_unlock(&dqopt->dqio_mutex);
2089 spin_lock(&dq_state_lock);
2090 dqopt->flags |= dquot_state_flag(flags, type);
2091 spin_unlock(&dq_state_lock);
2093 add_dquot_ref(sb, type);
2094 mutex_unlock(&dqopt->dqonoff_mutex);
2099 dqopt->files[type] = NULL;
2102 if (oldflags != -1) {
2103 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2104 /* Set the flags back (in the case of accidental quotaon()
2105 * on a wrong file we don't want to mess up the flags) */
2106 inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
2107 inode->i_flags |= oldflags;
2108 mutex_unlock(&inode->i_mutex);
2110 mutex_unlock(&dqopt->dqonoff_mutex);
2112 put_quota_format(fmt);
2117 /* Reenable quotas on remount RW */
2118 static int vfs_quota_on_remount(struct super_block *sb, int type)
2120 struct quota_info *dqopt = sb_dqopt(sb);
2121 struct inode *inode;
2125 mutex_lock(&dqopt->dqonoff_mutex);
2126 if (!sb_has_quota_suspended(sb, type)) {
2127 mutex_unlock(&dqopt->dqonoff_mutex);
2130 inode = dqopt->files[type];
2131 dqopt->files[type] = NULL;
2132 spin_lock(&dq_state_lock);
2133 flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
2134 DQUOT_LIMITS_ENABLED, type);
2135 dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type);
2136 spin_unlock(&dq_state_lock);
2137 mutex_unlock(&dqopt->dqonoff_mutex);
2139 flags = dquot_generic_flag(flags, type);
2140 ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id,
2147 int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
2150 int error = security_quota_on(path->dentry);
2153 /* Quota file not on the same filesystem? */
2154 if (path->mnt->mnt_sb != sb)
2157 error = vfs_load_quota_inode(path->dentry->d_inode, type,
2158 format_id, DQUOT_USAGE_ENABLED |
2159 DQUOT_LIMITS_ENABLED);
2162 EXPORT_SYMBOL(vfs_quota_on_path);
2164 int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name,
2171 return vfs_quota_on_remount(sb, type);
2173 error = kern_path(name, LOOKUP_FOLLOW, &path);
2175 error = vfs_quota_on_path(sb, type, format_id, &path);
2180 EXPORT_SYMBOL(vfs_quota_on);
2183 * More powerful function for turning on quotas allowing setting
2184 * of individual quota flags
2186 int vfs_quota_enable(struct inode *inode, int type, int format_id,
2190 struct super_block *sb = inode->i_sb;
2191 struct quota_info *dqopt = sb_dqopt(sb);
2193 /* Just unsuspend quotas? */
2194 if (flags & DQUOT_SUSPENDED)
2195 return vfs_quota_on_remount(sb, type);
2198 /* Just updating flags needed? */
2199 if (sb_has_quota_loaded(sb, type)) {
2200 mutex_lock(&dqopt->dqonoff_mutex);
2201 /* Now do a reliable test... */
2202 if (!sb_has_quota_loaded(sb, type)) {
2203 mutex_unlock(&dqopt->dqonoff_mutex);
2206 if (flags & DQUOT_USAGE_ENABLED &&
2207 sb_has_quota_usage_enabled(sb, type)) {
2211 if (flags & DQUOT_LIMITS_ENABLED &&
2212 sb_has_quota_limits_enabled(sb, type)) {
2216 spin_lock(&dq_state_lock);
2217 sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
2218 spin_unlock(&dq_state_lock);
2220 mutex_unlock(&dqopt->dqonoff_mutex);
2225 return vfs_load_quota_inode(inode, type, format_id, flags);
2227 EXPORT_SYMBOL(vfs_quota_enable);
2230 * This function is used when filesystem needs to initialize quotas
2231 * during mount time.
2233 int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
2234 int format_id, int type)
2236 struct dentry *dentry;
2239 mutex_lock(&sb->s_root->d_inode->i_mutex);
2240 dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
2241 mutex_unlock(&sb->s_root->d_inode->i_mutex);
2243 return PTR_ERR(dentry);
2245 if (!dentry->d_inode) {
2250 error = security_quota_on(dentry);
2252 error = vfs_load_quota_inode(dentry->d_inode, type, format_id,
2253 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
2259 EXPORT_SYMBOL(vfs_quota_on_mount);
2261 /* Wrapper to turn on quotas when remounting rw */
2262 int vfs_dq_quota_on_remount(struct super_block *sb)
2267 if (!sb->s_qcop || !sb->s_qcop->quota_on)
2269 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
2270 err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1);
2271 if (err < 0 && !ret)
2276 EXPORT_SYMBOL(vfs_dq_quota_on_remount);
2278 static inline qsize_t qbtos(qsize_t blocks)
2280 return blocks << QIF_DQBLKSIZE_BITS;
2283 static inline qsize_t stoqb(qsize_t space)
2285 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
2288 /* Generic routine for getting common part of quota structure */
2289 static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di)
2291 struct mem_dqblk *dm = &dquot->dq_dqb;
2293 spin_lock(&dq_data_lock);
2294 di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit);
2295 di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit);
2296 di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace;
2297 di->dqb_ihardlimit = dm->dqb_ihardlimit;
2298 di->dqb_isoftlimit = dm->dqb_isoftlimit;
2299 di->dqb_curinodes = dm->dqb_curinodes;
2300 di->dqb_btime = dm->dqb_btime;
2301 di->dqb_itime = dm->dqb_itime;
2302 di->dqb_valid = QIF_ALL;
2303 spin_unlock(&dq_data_lock);
2306 int vfs_get_dqblk(struct super_block *sb, int type, qid_t id,
2307 struct if_dqblk *di)
2309 struct dquot *dquot;
2311 dquot = dqget(sb, id, type);
2314 do_get_dqblk(dquot, di);
2319 EXPORT_SYMBOL(vfs_get_dqblk);
2321 /* Generic routine for setting common part of quota structure */
2322 static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
2324 struct mem_dqblk *dm = &dquot->dq_dqb;
2325 int check_blim = 0, check_ilim = 0;
2326 struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
2328 if ((di->dqb_valid & QIF_BLIMITS &&
2329 (di->dqb_bhardlimit > dqi->dqi_maxblimit ||
2330 di->dqb_bsoftlimit > dqi->dqi_maxblimit)) ||
2331 (di->dqb_valid & QIF_ILIMITS &&
2332 (di->dqb_ihardlimit > dqi->dqi_maxilimit ||
2333 di->dqb_isoftlimit > dqi->dqi_maxilimit)))
2336 spin_lock(&dq_data_lock);
2337 if (di->dqb_valid & QIF_SPACE) {
2338 dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace;
2340 set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
2342 if (di->dqb_valid & QIF_BLIMITS) {
2343 dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit);
2344 dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit);
2346 set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
2348 if (di->dqb_valid & QIF_INODES) {
2349 dm->dqb_curinodes = di->dqb_curinodes;
2351 set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
2353 if (di->dqb_valid & QIF_ILIMITS) {
2354 dm->dqb_isoftlimit = di->dqb_isoftlimit;
2355 dm->dqb_ihardlimit = di->dqb_ihardlimit;
2357 set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
2359 if (di->dqb_valid & QIF_BTIME) {
2360 dm->dqb_btime = di->dqb_btime;
2362 set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
2364 if (di->dqb_valid & QIF_ITIME) {
2365 dm->dqb_itime = di->dqb_itime;
2367 set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
2371 if (!dm->dqb_bsoftlimit ||
2372 dm->dqb_curspace < dm->dqb_bsoftlimit) {
2374 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
2375 } else if (!(di->dqb_valid & QIF_BTIME))
2376 /* Set grace only if user hasn't provided his own... */
2377 dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
2380 if (!dm->dqb_isoftlimit ||
2381 dm->dqb_curinodes < dm->dqb_isoftlimit) {
2383 clear_bit(DQ_INODES_B, &dquot->dq_flags);
2384 } else if (!(di->dqb_valid & QIF_ITIME))
2385 /* Set grace only if user hasn't provided his own... */
2386 dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
2388 if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit ||
2390 clear_bit(DQ_FAKE_B, &dquot->dq_flags);
2392 set_bit(DQ_FAKE_B, &dquot->dq_flags);
2393 spin_unlock(&dq_data_lock);
2394 mark_dquot_dirty(dquot);
2399 int vfs_set_dqblk(struct super_block *sb, int type, qid_t id,
2400 struct if_dqblk *di)
2402 struct dquot *dquot;
2405 dquot = dqget(sb, id, type);
2410 rc = do_set_dqblk(dquot, di);
2415 EXPORT_SYMBOL(vfs_set_dqblk);
2417 /* Generic routine for getting common part of quota file information */
2418 int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2420 struct mem_dqinfo *mi;
2422 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2423 if (!sb_has_quota_active(sb, type)) {
2424 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2427 mi = sb_dqopt(sb)->info + type;
2428 spin_lock(&dq_data_lock);
2429 ii->dqi_bgrace = mi->dqi_bgrace;
2430 ii->dqi_igrace = mi->dqi_igrace;
2431 ii->dqi_flags = mi->dqi_flags & DQF_MASK;
2432 ii->dqi_valid = IIF_ALL;
2433 spin_unlock(&dq_data_lock);
2434 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2437 EXPORT_SYMBOL(vfs_get_dqinfo);
2439 /* Generic routine for setting common part of quota file information */
2440 int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2442 struct mem_dqinfo *mi;
2445 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2446 if (!sb_has_quota_active(sb, type)) {
2450 mi = sb_dqopt(sb)->info + type;
2451 spin_lock(&dq_data_lock);
2452 if (ii->dqi_valid & IIF_BGRACE)
2453 mi->dqi_bgrace = ii->dqi_bgrace;
2454 if (ii->dqi_valid & IIF_IGRACE)
2455 mi->dqi_igrace = ii->dqi_igrace;
2456 if (ii->dqi_valid & IIF_FLAGS)
2457 mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) |
2458 (ii->dqi_flags & DQF_MASK);
2459 spin_unlock(&dq_data_lock);
2460 mark_info_dirty(sb, type);
2461 /* Force write to disk */
2462 sb->dq_op->write_info(sb, type);
2464 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2467 EXPORT_SYMBOL(vfs_set_dqinfo);
2469 const struct quotactl_ops vfs_quotactl_ops = {
2470 .quota_on = vfs_quota_on,
2471 .quota_off = vfs_quota_off,
2472 .quota_sync = vfs_quota_sync,
2473 .get_info = vfs_get_dqinfo,
2474 .set_info = vfs_set_dqinfo,
2475 .get_dqblk = vfs_get_dqblk,
2476 .set_dqblk = vfs_set_dqblk
2479 static ctl_table fs_dqstats_table[] = {
2481 .procname = "lookups",
2482 .data = &dqstats.lookups,
2483 .maxlen = sizeof(int),
2485 .proc_handler = proc_dointvec,
2488 .procname = "drops",
2489 .data = &dqstats.drops,
2490 .maxlen = sizeof(int),
2492 .proc_handler = proc_dointvec,
2495 .procname = "reads",
2496 .data = &dqstats.reads,
2497 .maxlen = sizeof(int),
2499 .proc_handler = proc_dointvec,
2502 .procname = "writes",
2503 .data = &dqstats.writes,
2504 .maxlen = sizeof(int),
2506 .proc_handler = proc_dointvec,
2509 .procname = "cache_hits",
2510 .data = &dqstats.cache_hits,
2511 .maxlen = sizeof(int),
2513 .proc_handler = proc_dointvec,
2516 .procname = "allocated_dquots",
2517 .data = &dqstats.allocated_dquots,
2518 .maxlen = sizeof(int),
2520 .proc_handler = proc_dointvec,
2523 .procname = "free_dquots",
2524 .data = &dqstats.free_dquots,
2525 .maxlen = sizeof(int),
2527 .proc_handler = proc_dointvec,
2530 .procname = "syncs",
2531 .data = &dqstats.syncs,
2532 .maxlen = sizeof(int),
2534 .proc_handler = proc_dointvec,
2536 #ifdef CONFIG_PRINT_QUOTA_WARNING
2538 .procname = "warnings",
2539 .data = &flag_print_warnings,
2540 .maxlen = sizeof(int),
2542 .proc_handler = proc_dointvec,
2548 static ctl_table fs_table[] = {
2550 .procname = "quota",
2552 .child = fs_dqstats_table,
2557 static ctl_table sys_table[] = {
2566 static int __init dquot_init(void)
2569 unsigned long nr_hash, order;
2571 printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
2573 register_sysctl_table(sys_table);
2575 dquot_cachep = kmem_cache_create("dquot",
2576 sizeof(struct dquot), sizeof(unsigned long) * 4,
2577 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
2578 SLAB_MEM_SPREAD|SLAB_PANIC),
2582 dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
2584 panic("Cannot create dquot hash table");
2586 /* Find power-of-two hlist_heads which can fit into allocation */
2587 nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
2591 } while (nr_hash >> dq_hash_bits);
2594 nr_hash = 1UL << dq_hash_bits;
2595 dq_hash_mask = nr_hash - 1;
2596 for (i = 0; i < nr_hash; i++)
2597 INIT_HLIST_HEAD(dquot_hash + i);
2599 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2600 nr_hash, order, (PAGE_SIZE << order));
2602 register_shrinker(&dqcache_shrinker);
2606 module_init(dquot_init);