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>
83 #define __DQUOT_PARANOIA
86 * There are three quota SMP locks. dq_list_lock protects all lists with quotas
87 * and quota formats, dqstats structure containing statistics about the lists
88 * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
89 * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
90 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
91 * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
92 * modifications of quota state (on quotaon and quotaoff) and readers who care
93 * about latest values take it as well.
95 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
96 * dq_list_lock > dq_state_lock
98 * Note that some things (eg. sb pointer, type, id) doesn't change during
99 * the life of the dquot structure and so needn't to be protected by a lock
101 * Any operation working on dquots via inode pointers must hold dqptr_sem. If
102 * operation is just reading pointers from inode (or not using them at all) the
103 * read lock is enough. If pointers are altered function must hold write lock.
104 * Special care needs to be taken about S_NOQUOTA inode flag (marking that
105 * inode is a quota file). Functions adding pointers from inode to dquots have
106 * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they
107 * have to do all pointer modifications before dropping dqptr_sem. This makes
108 * sure they cannot race with quotaon which first sets S_NOQUOTA flag and
109 * then drops all pointers to dquots from an inode.
111 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
112 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
113 * Currently dquot is locked only when it is being read to memory (or space for
114 * it is being allocated) on the first dqget() and when it is being released on
115 * the last dqput(). The allocation and release oparations are serialized by
116 * the dq_lock and by checking the use count in dquot_release(). Write
117 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
118 * spinlock to internal buffers before writing.
120 * Lock ordering (including related VFS locks) is the following:
121 * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
123 * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
124 * dqptr_sem. But filesystem has to count with the fact that functions such as
125 * dquot_alloc_space() acquire dqptr_sem and they usually have to be called
126 * from inside a transaction to keep filesystem consistency after a crash. Also
127 * filesystems usually want to do some IO on dquot from ->mark_dirty which is
128 * called with dqptr_sem held.
129 * i_mutex on quota files is special (it's below dqio_mutex)
132 static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock);
133 static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock);
134 __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock);
135 EXPORT_SYMBOL(dq_data_lock);
137 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);
234 static inline unsigned int
235 hashfn(const struct super_block *sb, unsigned int id, int type)
239 tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
240 return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
244 * Following list functions expect dq_list_lock to be held
246 static inline void insert_dquot_hash(struct dquot *dquot)
248 struct hlist_head *head;
249 head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type);
250 hlist_add_head(&dquot->dq_hash, head);
253 static inline void remove_dquot_hash(struct dquot *dquot)
255 hlist_del_init(&dquot->dq_hash);
258 static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb,
259 unsigned int id, int type)
261 struct hlist_node *node;
264 hlist_for_each (node, dquot_hash+hashent) {
265 dquot = hlist_entry(node, struct dquot, dq_hash);
266 if (dquot->dq_sb == sb && dquot->dq_id == id &&
267 dquot->dq_type == type)
273 /* Add a dquot to the tail of the free list */
274 static inline void put_dquot_last(struct dquot *dquot)
276 list_add_tail(&dquot->dq_free, &free_dquots);
277 dqstats.free_dquots++;
280 static inline void remove_free_dquot(struct dquot *dquot)
282 if (list_empty(&dquot->dq_free))
284 list_del_init(&dquot->dq_free);
285 dqstats.free_dquots--;
288 static inline void put_inuse(struct dquot *dquot)
290 /* We add to the back of inuse list so we don't have to restart
291 * when traversing this list and we block */
292 list_add_tail(&dquot->dq_inuse, &inuse_list);
293 dqstats.allocated_dquots++;
296 static inline void remove_inuse(struct dquot *dquot)
298 dqstats.allocated_dquots--;
299 list_del(&dquot->dq_inuse);
302 * End of list functions needing dq_list_lock
305 static void wait_on_dquot(struct dquot *dquot)
307 mutex_lock(&dquot->dq_lock);
308 mutex_unlock(&dquot->dq_lock);
311 static inline int dquot_dirty(struct dquot *dquot)
313 return test_bit(DQ_MOD_B, &dquot->dq_flags);
316 static inline int mark_dquot_dirty(struct dquot *dquot)
318 return dquot->dq_sb->dq_op->mark_dirty(dquot);
321 int dquot_mark_dquot_dirty(struct dquot *dquot)
323 spin_lock(&dq_list_lock);
324 if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags))
325 list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
326 info[dquot->dq_type].dqi_dirty_list);
327 spin_unlock(&dq_list_lock);
330 EXPORT_SYMBOL(dquot_mark_dquot_dirty);
332 /* Dirtify all the dquots - this can block when journalling */
333 static inline int mark_all_dquot_dirty(struct dquot * const *dquot)
338 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
340 /* Even in case of error we have to continue */
341 ret = mark_dquot_dirty(dquot[cnt]);
348 static inline void dqput_all(struct dquot **dquot)
352 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
356 /* This function needs dq_list_lock */
357 static inline int clear_dquot_dirty(struct dquot *dquot)
359 if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
361 list_del_init(&dquot->dq_dirty);
365 void mark_info_dirty(struct super_block *sb, int type)
367 set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
369 EXPORT_SYMBOL(mark_info_dirty);
372 * Read dquot from disk and alloc space for it
375 int dquot_acquire(struct dquot *dquot)
377 int ret = 0, ret2 = 0;
378 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
380 mutex_lock(&dquot->dq_lock);
381 mutex_lock(&dqopt->dqio_mutex);
382 if (!test_bit(DQ_READ_B, &dquot->dq_flags))
383 ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
386 set_bit(DQ_READ_B, &dquot->dq_flags);
387 /* Instantiate dquot if needed */
388 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
389 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
390 /* Write the info if needed */
391 if (info_dirty(&dqopt->info[dquot->dq_type])) {
392 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(
393 dquot->dq_sb, dquot->dq_type);
402 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
404 mutex_unlock(&dqopt->dqio_mutex);
405 mutex_unlock(&dquot->dq_lock);
408 EXPORT_SYMBOL(dquot_acquire);
411 * Write dquot to disk
413 int dquot_commit(struct dquot *dquot)
415 int ret = 0, ret2 = 0;
416 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
418 mutex_lock(&dqopt->dqio_mutex);
419 spin_lock(&dq_list_lock);
420 if (!clear_dquot_dirty(dquot)) {
421 spin_unlock(&dq_list_lock);
424 spin_unlock(&dq_list_lock);
425 /* Inactive dquot can be only if there was error during read/init
426 * => we have better not writing it */
427 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
428 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
429 if (info_dirty(&dqopt->info[dquot->dq_type])) {
430 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(
431 dquot->dq_sb, dquot->dq_type);
437 mutex_unlock(&dqopt->dqio_mutex);
440 EXPORT_SYMBOL(dquot_commit);
445 int dquot_release(struct dquot *dquot)
447 int ret = 0, ret2 = 0;
448 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
450 mutex_lock(&dquot->dq_lock);
451 /* Check whether we are not racing with some other dqget() */
452 if (atomic_read(&dquot->dq_count) > 1)
454 mutex_lock(&dqopt->dqio_mutex);
455 if (dqopt->ops[dquot->dq_type]->release_dqblk) {
456 ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
458 if (info_dirty(&dqopt->info[dquot->dq_type])) {
459 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(
460 dquot->dq_sb, dquot->dq_type);
465 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
466 mutex_unlock(&dqopt->dqio_mutex);
468 mutex_unlock(&dquot->dq_lock);
471 EXPORT_SYMBOL(dquot_release);
473 void dquot_destroy(struct dquot *dquot)
475 kmem_cache_free(dquot_cachep, dquot);
477 EXPORT_SYMBOL(dquot_destroy);
479 static inline void do_destroy_dquot(struct dquot *dquot)
481 dquot->dq_sb->dq_op->destroy_dquot(dquot);
484 /* Invalidate all dquots on the list. Note that this function is called after
485 * quota is disabled and pointers from inodes removed so there cannot be new
486 * quota users. There can still be some users of quotas due to inodes being
487 * just deleted or pruned by prune_icache() (those are not attached to any
488 * list) or parallel quotactl call. We have to wait for such users.
490 static void invalidate_dquots(struct super_block *sb, int type)
492 struct dquot *dquot, *tmp;
495 spin_lock(&dq_list_lock);
496 list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
497 if (dquot->dq_sb != sb)
499 if (dquot->dq_type != type)
501 /* Wait for dquot users */
502 if (atomic_read(&dquot->dq_count)) {
505 atomic_inc(&dquot->dq_count);
506 prepare_to_wait(&dquot->dq_wait_unused, &wait,
507 TASK_UNINTERRUPTIBLE);
508 spin_unlock(&dq_list_lock);
509 /* Once dqput() wakes us up, we know it's time to free
511 * IMPORTANT: we rely on the fact that there is always
512 * at most one process waiting for dquot to free.
513 * Otherwise dq_count would be > 1 and we would never
516 if (atomic_read(&dquot->dq_count) > 1)
518 finish_wait(&dquot->dq_wait_unused, &wait);
520 /* At this moment dquot() need not exist (it could be
521 * reclaimed by prune_dqcache(). Hence we must
526 * Quota now has no users and it has been written on last
529 remove_dquot_hash(dquot);
530 remove_free_dquot(dquot);
532 do_destroy_dquot(dquot);
534 spin_unlock(&dq_list_lock);
537 /* Call callback for every active dquot on given filesystem */
538 int dquot_scan_active(struct super_block *sb,
539 int (*fn)(struct dquot *dquot, unsigned long priv),
542 struct dquot *dquot, *old_dquot = NULL;
545 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
546 spin_lock(&dq_list_lock);
547 list_for_each_entry(dquot, &inuse_list, dq_inuse) {
548 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
550 if (dquot->dq_sb != sb)
552 /* Now we have active dquot so we can just increase use count */
553 atomic_inc(&dquot->dq_count);
555 spin_unlock(&dq_list_lock);
558 ret = fn(dquot, priv);
561 spin_lock(&dq_list_lock);
562 /* We are safe to continue now because our dquot could not
563 * be moved out of the inuse list while we hold the reference */
565 spin_unlock(&dq_list_lock);
568 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
571 EXPORT_SYMBOL(dquot_scan_active);
573 int vfs_quota_sync(struct super_block *sb, int type, int wait)
575 struct list_head *dirty;
577 struct quota_info *dqopt = sb_dqopt(sb);
580 mutex_lock(&dqopt->dqonoff_mutex);
581 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
582 if (type != -1 && cnt != type)
584 if (!sb_has_quota_active(sb, cnt))
586 spin_lock(&dq_list_lock);
587 dirty = &dqopt->info[cnt].dqi_dirty_list;
588 while (!list_empty(dirty)) {
589 dquot = list_first_entry(dirty, struct dquot,
591 /* Dirty and inactive can be only bad dquot... */
592 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
593 clear_dquot_dirty(dquot);
596 /* Now we have active dquot from which someone is
597 * holding reference so we can safely just increase
599 atomic_inc(&dquot->dq_count);
601 spin_unlock(&dq_list_lock);
602 sb->dq_op->write_dquot(dquot);
604 spin_lock(&dq_list_lock);
606 spin_unlock(&dq_list_lock);
609 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
610 if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt)
611 && info_dirty(&dqopt->info[cnt]))
612 sb->dq_op->write_info(sb, cnt);
613 spin_lock(&dq_list_lock);
615 spin_unlock(&dq_list_lock);
616 mutex_unlock(&dqopt->dqonoff_mutex);
618 if (!wait || (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE))
621 /* This is not very clever (and fast) but currently I don't know about
622 * any other simple way of getting quota data to disk and we must get
623 * them there for userspace to be visible... */
624 if (sb->s_op->sync_fs)
625 sb->s_op->sync_fs(sb, 1);
626 sync_blockdev(sb->s_bdev);
629 * Now when everything is written we can discard the pagecache so
630 * that userspace sees the changes.
632 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
633 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
634 if (type != -1 && cnt != type)
636 if (!sb_has_quota_active(sb, cnt))
638 mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex,
640 truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0);
641 mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex);
643 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
647 EXPORT_SYMBOL(vfs_quota_sync);
649 /* Free unused dquots from cache */
650 static void prune_dqcache(int count)
652 struct list_head *head;
655 head = free_dquots.prev;
656 while (head != &free_dquots && count) {
657 dquot = list_entry(head, struct dquot, dq_free);
658 remove_dquot_hash(dquot);
659 remove_free_dquot(dquot);
661 do_destroy_dquot(dquot);
663 head = free_dquots.prev;
668 * This is called from kswapd when we think we need some
672 static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
675 spin_lock(&dq_list_lock);
677 spin_unlock(&dq_list_lock);
679 return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure;
682 static struct shrinker dqcache_shrinker = {
683 .shrink = shrink_dqcache_memory,
684 .seeks = DEFAULT_SEEKS,
688 * Put reference to dquot
689 * NOTE: If you change this function please check whether dqput_blocks() works right...
691 void dqput(struct dquot *dquot)
697 #ifdef __DQUOT_PARANOIA
698 if (!atomic_read(&dquot->dq_count)) {
699 printk("VFS: dqput: trying to free free dquot\n");
700 printk("VFS: device %s, dquot of %s %d\n",
702 quotatypes[dquot->dq_type],
708 spin_lock(&dq_list_lock);
710 spin_unlock(&dq_list_lock);
712 spin_lock(&dq_list_lock);
713 if (atomic_read(&dquot->dq_count) > 1) {
714 /* We have more than one user... nothing to do */
715 atomic_dec(&dquot->dq_count);
716 /* Releasing dquot during quotaoff phase? */
717 if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) &&
718 atomic_read(&dquot->dq_count) == 1)
719 wake_up(&dquot->dq_wait_unused);
720 spin_unlock(&dq_list_lock);
723 /* Need to release dquot? */
724 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
725 spin_unlock(&dq_list_lock);
726 /* Commit dquot before releasing */
727 ret = dquot->dq_sb->dq_op->write_dquot(dquot);
729 printk(KERN_ERR "VFS: cannot write quota structure on "
730 "device %s (error %d). Quota may get out of "
731 "sync!\n", dquot->dq_sb->s_id, ret);
733 * We clear dirty bit anyway, so that we avoid
736 spin_lock(&dq_list_lock);
737 clear_dquot_dirty(dquot);
738 spin_unlock(&dq_list_lock);
742 /* Clear flag in case dquot was inactive (something bad happened) */
743 clear_dquot_dirty(dquot);
744 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
745 spin_unlock(&dq_list_lock);
746 dquot->dq_sb->dq_op->release_dquot(dquot);
749 atomic_dec(&dquot->dq_count);
750 #ifdef __DQUOT_PARANOIA
752 BUG_ON(!list_empty(&dquot->dq_free));
754 put_dquot_last(dquot);
755 spin_unlock(&dq_list_lock);
757 EXPORT_SYMBOL(dqput);
759 struct dquot *dquot_alloc(struct super_block *sb, int type)
761 return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
763 EXPORT_SYMBOL(dquot_alloc);
765 static struct dquot *get_empty_dquot(struct super_block *sb, int type)
769 dquot = sb->dq_op->alloc_dquot(sb, type);
773 mutex_init(&dquot->dq_lock);
774 INIT_LIST_HEAD(&dquot->dq_free);
775 INIT_LIST_HEAD(&dquot->dq_inuse);
776 INIT_HLIST_NODE(&dquot->dq_hash);
777 INIT_LIST_HEAD(&dquot->dq_dirty);
778 init_waitqueue_head(&dquot->dq_wait_unused);
780 dquot->dq_type = type;
781 atomic_set(&dquot->dq_count, 1);
787 * Get reference to dquot
789 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
790 * destroying our dquot by:
791 * a) checking for quota flags under dq_list_lock and
792 * b) getting a reference to dquot before we release dq_list_lock
794 struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
796 unsigned int hashent = hashfn(sb, id, type);
797 struct dquot *dquot = NULL, *empty = NULL;
799 if (!sb_has_quota_active(sb, type))
802 spin_lock(&dq_list_lock);
803 spin_lock(&dq_state_lock);
804 if (!sb_has_quota_active(sb, type)) {
805 spin_unlock(&dq_state_lock);
806 spin_unlock(&dq_list_lock);
809 spin_unlock(&dq_state_lock);
811 dquot = find_dquot(hashent, sb, id, type);
814 spin_unlock(&dq_list_lock);
815 empty = get_empty_dquot(sb, type);
817 schedule(); /* Try to wait for a moment... */
823 /* all dquots go on the inuse_list */
825 /* hash it first so it can be found */
826 insert_dquot_hash(dquot);
828 spin_unlock(&dq_list_lock);
830 if (!atomic_read(&dquot->dq_count))
831 remove_free_dquot(dquot);
832 atomic_inc(&dquot->dq_count);
833 dqstats.cache_hits++;
835 spin_unlock(&dq_list_lock);
837 /* Wait for dq_lock - after this we know that either dquot_release() is
838 * already finished or it will be canceled due to dq_count > 1 test */
839 wait_on_dquot(dquot);
840 /* Read the dquot / allocate space in quota file */
841 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) &&
842 sb->dq_op->acquire_dquot(dquot) < 0) {
847 #ifdef __DQUOT_PARANOIA
848 BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
852 do_destroy_dquot(empty);
856 EXPORT_SYMBOL(dqget);
858 static int dqinit_needed(struct inode *inode, int type)
862 if (IS_NOQUOTA(inode))
865 return !inode->i_dquot[type];
866 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
867 if (!inode->i_dquot[cnt])
872 /* This routine is guarded by dqonoff_mutex mutex */
873 static void add_dquot_ref(struct super_block *sb, int type)
875 struct inode *inode, *old_inode = NULL;
878 spin_lock(&inode_lock);
879 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
880 if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE|I_NEW))
882 if (unlikely(inode_get_rsv_space(inode) > 0))
884 if (!atomic_read(&inode->i_writecount))
886 if (!dqinit_needed(inode, type))
890 spin_unlock(&inode_lock);
893 sb->dq_op->initialize(inode, type);
894 /* We hold a reference to 'inode' so it couldn't have been
895 * removed from s_inodes list while we dropped the inode_lock.
896 * We cannot iput the inode now as we can be holding the last
897 * reference and we cannot iput it under inode_lock. So we
898 * keep the reference and iput it later. */
900 spin_lock(&inode_lock);
902 spin_unlock(&inode_lock);
906 printk(KERN_WARNING "VFS (%s): Writes happened before quota"
907 " was turned on thus quota information is probably "
908 "inconsistent. Please run quotacheck(8).\n", sb->s_id);
913 * Return 0 if dqput() won't block.
914 * (note that 1 doesn't necessarily mean blocking)
916 static inline int dqput_blocks(struct dquot *dquot)
918 if (atomic_read(&dquot->dq_count) <= 1)
924 * Remove references to dquots from inode and add dquot to list for freeing
925 * if we have the last referece to dquot
926 * We can't race with anybody because we hold dqptr_sem for writing...
928 static int remove_inode_dquot_ref(struct inode *inode, int type,
929 struct list_head *tofree_head)
931 struct dquot *dquot = inode->i_dquot[type];
933 inode->i_dquot[type] = NULL;
935 if (dqput_blocks(dquot)) {
936 #ifdef __DQUOT_PARANOIA
937 if (atomic_read(&dquot->dq_count) != 1)
938 printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count));
940 spin_lock(&dq_list_lock);
941 /* As dquot must have currently users it can't be on
942 * the free list... */
943 list_add(&dquot->dq_free, tofree_head);
944 spin_unlock(&dq_list_lock);
948 dqput(dquot); /* We have guaranteed we won't block */
954 * Free list of dquots
955 * Dquots are removed from inodes and no new references can be got so we are
956 * the only ones holding reference
958 static void put_dquot_list(struct list_head *tofree_head)
960 struct list_head *act_head;
963 act_head = tofree_head->next;
964 while (act_head != tofree_head) {
965 dquot = list_entry(act_head, struct dquot, dq_free);
966 act_head = act_head->next;
967 /* Remove dquot from the list so we won't have problems... */
968 list_del_init(&dquot->dq_free);
973 static void remove_dquot_ref(struct super_block *sb, int type,
974 struct list_head *tofree_head)
978 spin_lock(&inode_lock);
979 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
981 * We have to scan also I_NEW inodes because they can already
982 * have quota pointer initialized. Luckily, we need to touch
983 * only quota pointers and these have separate locking
986 if (!IS_NOQUOTA(inode))
987 remove_inode_dquot_ref(inode, type, tofree_head);
989 spin_unlock(&inode_lock);
992 /* Gather all references from inodes and drop them */
993 static void drop_dquot_ref(struct super_block *sb, int type)
995 LIST_HEAD(tofree_head);
998 down_write(&sb_dqopt(sb)->dqptr_sem);
999 remove_dquot_ref(sb, type, &tofree_head);
1000 up_write(&sb_dqopt(sb)->dqptr_sem);
1001 put_dquot_list(&tofree_head);
1005 static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
1007 dquot->dq_dqb.dqb_curinodes += number;
1010 static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
1012 dquot->dq_dqb.dqb_curspace += number;
1015 static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
1017 dquot->dq_dqb.dqb_rsvspace += number;
1021 * Claim reserved quota space
1023 static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number)
1025 if (dquot->dq_dqb.dqb_rsvspace < number) {
1027 number = dquot->dq_dqb.dqb_rsvspace;
1029 dquot->dq_dqb.dqb_curspace += number;
1030 dquot->dq_dqb.dqb_rsvspace -= number;
1034 void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
1036 if (dquot->dq_dqb.dqb_rsvspace >= number)
1037 dquot->dq_dqb.dqb_rsvspace -= number;
1040 dquot->dq_dqb.dqb_rsvspace = 0;
1044 static void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
1046 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
1047 dquot->dq_dqb.dqb_curinodes >= number)
1048 dquot->dq_dqb.dqb_curinodes -= number;
1050 dquot->dq_dqb.dqb_curinodes = 0;
1051 if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
1052 dquot->dq_dqb.dqb_itime = (time_t) 0;
1053 clear_bit(DQ_INODES_B, &dquot->dq_flags);
1056 static void dquot_decr_space(struct dquot *dquot, qsize_t number)
1058 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
1059 dquot->dq_dqb.dqb_curspace >= number)
1060 dquot->dq_dqb.dqb_curspace -= number;
1062 dquot->dq_dqb.dqb_curspace = 0;
1063 if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
1064 dquot->dq_dqb.dqb_btime = (time_t) 0;
1065 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
1068 static int warning_issued(struct dquot *dquot, const int warntype)
1070 int flag = (warntype == QUOTA_NL_BHARDWARN ||
1071 warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
1072 ((warntype == QUOTA_NL_IHARDWARN ||
1073 warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
1077 return test_and_set_bit(flag, &dquot->dq_flags);
1080 #ifdef CONFIG_PRINT_QUOTA_WARNING
1081 static int flag_print_warnings = 1;
1083 static int need_print_warning(struct dquot *dquot)
1085 if (!flag_print_warnings)
1088 switch (dquot->dq_type) {
1090 return current_fsuid() == dquot->dq_id;
1092 return in_group_p(dquot->dq_id);
1097 /* Print warning to user which exceeded quota */
1098 static void print_warning(struct dquot *dquot, const int warntype)
1101 struct tty_struct *tty;
1103 if (warntype == QUOTA_NL_IHARDBELOW ||
1104 warntype == QUOTA_NL_ISOFTBELOW ||
1105 warntype == QUOTA_NL_BHARDBELOW ||
1106 warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot))
1109 tty = get_current_tty();
1112 tty_write_message(tty, dquot->dq_sb->s_id);
1113 if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
1114 tty_write_message(tty, ": warning, ");
1116 tty_write_message(tty, ": write failed, ");
1117 tty_write_message(tty, quotatypes[dquot->dq_type]);
1119 case QUOTA_NL_IHARDWARN:
1120 msg = " file limit reached.\r\n";
1122 case QUOTA_NL_ISOFTLONGWARN:
1123 msg = " file quota exceeded too long.\r\n";
1125 case QUOTA_NL_ISOFTWARN:
1126 msg = " file quota exceeded.\r\n";
1128 case QUOTA_NL_BHARDWARN:
1129 msg = " block limit reached.\r\n";
1131 case QUOTA_NL_BSOFTLONGWARN:
1132 msg = " block quota exceeded too long.\r\n";
1134 case QUOTA_NL_BSOFTWARN:
1135 msg = " block quota exceeded.\r\n";
1138 tty_write_message(tty, msg);
1144 * Write warnings to the console and send warning messages over netlink.
1146 * Note that this function can sleep.
1148 static void flush_warnings(struct dquot *const *dquots, char *warntype)
1153 for (i = 0; i < MAXQUOTAS; i++) {
1155 if (dq && warntype[i] != QUOTA_NL_NOWARN &&
1156 !warning_issued(dq, warntype[i])) {
1157 #ifdef CONFIG_PRINT_QUOTA_WARNING
1158 print_warning(dq, warntype[i]);
1160 quota_send_warning(dq->dq_type, dq->dq_id,
1161 dq->dq_sb->s_dev, warntype[i]);
1166 static int ignore_hardlimit(struct dquot *dquot)
1168 struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
1170 return capable(CAP_SYS_RESOURCE) &&
1171 (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD ||
1172 !(info->dqi_flags & V1_DQF_RSQUASH));
1175 /* needs dq_data_lock */
1176 static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype)
1178 qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes;
1180 *warntype = QUOTA_NL_NOWARN;
1181 if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
1182 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1185 if (dquot->dq_dqb.dqb_ihardlimit &&
1186 newinodes > dquot->dq_dqb.dqb_ihardlimit &&
1187 !ignore_hardlimit(dquot)) {
1188 *warntype = QUOTA_NL_IHARDWARN;
1192 if (dquot->dq_dqb.dqb_isoftlimit &&
1193 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1194 dquot->dq_dqb.dqb_itime &&
1195 get_seconds() >= dquot->dq_dqb.dqb_itime &&
1196 !ignore_hardlimit(dquot)) {
1197 *warntype = QUOTA_NL_ISOFTLONGWARN;
1201 if (dquot->dq_dqb.dqb_isoftlimit &&
1202 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1203 dquot->dq_dqb.dqb_itime == 0) {
1204 *warntype = QUOTA_NL_ISOFTWARN;
1205 dquot->dq_dqb.dqb_itime = get_seconds() +
1206 sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
1212 /* needs dq_data_lock */
1213 static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype)
1216 struct super_block *sb = dquot->dq_sb;
1218 *warntype = QUOTA_NL_NOWARN;
1219 if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) ||
1220 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1223 tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace
1226 if (dquot->dq_dqb.dqb_bhardlimit &&
1227 tspace > dquot->dq_dqb.dqb_bhardlimit &&
1228 !ignore_hardlimit(dquot)) {
1230 *warntype = QUOTA_NL_BHARDWARN;
1234 if (dquot->dq_dqb.dqb_bsoftlimit &&
1235 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
1236 dquot->dq_dqb.dqb_btime &&
1237 get_seconds() >= dquot->dq_dqb.dqb_btime &&
1238 !ignore_hardlimit(dquot)) {
1240 *warntype = QUOTA_NL_BSOFTLONGWARN;
1244 if (dquot->dq_dqb.dqb_bsoftlimit &&
1245 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
1246 dquot->dq_dqb.dqb_btime == 0) {
1248 *warntype = QUOTA_NL_BSOFTWARN;
1249 dquot->dq_dqb.dqb_btime = get_seconds() +
1250 sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace;
1254 * We don't allow preallocation to exceed softlimit so exceeding will
1263 static int info_idq_free(struct dquot *dquot, qsize_t inodes)
1267 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1268 dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit ||
1269 !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type))
1270 return QUOTA_NL_NOWARN;
1272 newinodes = dquot->dq_dqb.dqb_curinodes - inodes;
1273 if (newinodes <= dquot->dq_dqb.dqb_isoftlimit)
1274 return QUOTA_NL_ISOFTBELOW;
1275 if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
1276 newinodes < dquot->dq_dqb.dqb_ihardlimit)
1277 return QUOTA_NL_IHARDBELOW;
1278 return QUOTA_NL_NOWARN;
1281 static int info_bdq_free(struct dquot *dquot, qsize_t space)
1283 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1284 dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
1285 return QUOTA_NL_NOWARN;
1287 if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit)
1288 return QUOTA_NL_BSOFTBELOW;
1289 if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit &&
1290 dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit)
1291 return QUOTA_NL_BHARDBELOW;
1292 return QUOTA_NL_NOWARN;
1296 * Initialize quota pointers in inode
1297 * We do things in a bit complicated way but by that we avoid calling
1298 * dqget() and thus filesystem callbacks under dqptr_sem.
1300 int dquot_initialize(struct inode *inode, int type)
1302 unsigned int id = 0;
1304 struct dquot *got[MAXQUOTAS];
1305 struct super_block *sb = inode->i_sb;
1308 /* First test before acquiring mutex - solves deadlocks when we
1309 * re-enter the quota code and are already holding the mutex */
1310 if (IS_NOQUOTA(inode))
1313 /* First get references to structures we might need. */
1314 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1316 if (type != -1 && cnt != type)
1326 got[cnt] = dqget(sb, id, cnt);
1329 down_write(&sb_dqopt(sb)->dqptr_sem);
1330 if (IS_NOQUOTA(inode))
1332 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1333 if (type != -1 && cnt != type)
1335 /* Avoid races with quotaoff() */
1336 if (!sb_has_quota_active(sb, cnt))
1338 if (!inode->i_dquot[cnt]) {
1339 inode->i_dquot[cnt] = got[cnt];
1342 * Make quota reservation system happy if someone
1343 * did a write before quota was turned on
1345 rsv = inode_get_rsv_space(inode);
1347 dquot_resv_space(inode->i_dquot[cnt], rsv);
1351 up_write(&sb_dqopt(sb)->dqptr_sem);
1352 /* Drop unused references */
1356 EXPORT_SYMBOL(dquot_initialize);
1359 * Release all quotas referenced by inode
1361 int dquot_drop(struct inode *inode)
1364 struct dquot *put[MAXQUOTAS];
1366 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1367 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1368 put[cnt] = inode->i_dquot[cnt];
1369 inode->i_dquot[cnt] = NULL;
1371 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1375 EXPORT_SYMBOL(dquot_drop);
1377 /* Wrapper to remove references to quota structures from inode */
1378 void vfs_dq_drop(struct inode *inode)
1380 /* Here we can get arbitrary inode from clear_inode() so we have
1381 * to be careful. OTOH we don't need locking as quota operations
1382 * are allowed to change only at mount time */
1383 if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op
1384 && inode->i_sb->dq_op->drop) {
1386 /* Test before calling to rule out calls from proc and such
1387 * where we are not allowed to block. Note that this is
1388 * actually reliable test even without the lock - the caller
1389 * must assure that nobody can come after the DQUOT_DROP and
1390 * add quota pointers back anyway */
1391 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1392 if (inode->i_dquot[cnt])
1394 if (cnt < MAXQUOTAS)
1395 inode->i_sb->dq_op->drop(inode);
1398 EXPORT_SYMBOL(vfs_dq_drop);
1401 * inode_reserved_space is managed internally by quota, and protected by
1402 * i_lock similar to i_blocks+i_bytes.
1404 static qsize_t *inode_reserved_space(struct inode * inode)
1406 /* Filesystem must explicitly define it's own method in order to use
1407 * quota reservation interface */
1408 BUG_ON(!inode->i_sb->dq_op->get_reserved_space);
1409 return inode->i_sb->dq_op->get_reserved_space(inode);
1412 void inode_add_rsv_space(struct inode *inode, qsize_t number)
1414 spin_lock(&inode->i_lock);
1415 *inode_reserved_space(inode) += number;
1416 spin_unlock(&inode->i_lock);
1418 EXPORT_SYMBOL(inode_add_rsv_space);
1420 void inode_claim_rsv_space(struct inode *inode, qsize_t number)
1422 spin_lock(&inode->i_lock);
1423 *inode_reserved_space(inode) -= number;
1424 __inode_add_bytes(inode, number);
1425 spin_unlock(&inode->i_lock);
1427 EXPORT_SYMBOL(inode_claim_rsv_space);
1429 void inode_sub_rsv_space(struct inode *inode, qsize_t number)
1431 spin_lock(&inode->i_lock);
1432 *inode_reserved_space(inode) -= number;
1433 spin_unlock(&inode->i_lock);
1435 EXPORT_SYMBOL(inode_sub_rsv_space);
1437 static qsize_t inode_get_rsv_space(struct inode *inode)
1441 if (!inode->i_sb->dq_op->get_reserved_space)
1443 spin_lock(&inode->i_lock);
1444 ret = *inode_reserved_space(inode);
1445 spin_unlock(&inode->i_lock);
1449 static void inode_incr_space(struct inode *inode, qsize_t number,
1453 inode_add_rsv_space(inode, number);
1455 inode_add_bytes(inode, number);
1458 static void inode_decr_space(struct inode *inode, qsize_t number, int reserve)
1461 inode_sub_rsv_space(inode, number);
1463 inode_sub_bytes(inode, number);
1467 * This functions updates i_blocks+i_bytes fields and quota information
1468 * (together with appropriate checks).
1470 * NOTE: We absolutely rely on the fact that caller dirties the inode
1471 * (usually helpers in quotaops.h care about this) and holds a handle for
1472 * the current transaction so that dquot write and inode write go into the
1477 * This operation can block, but only after everything is updated
1479 int __dquot_alloc_space(struct inode *inode, qsize_t number,
1480 int warn, int reserve)
1483 char warntype[MAXQUOTAS];
1486 * First test before acquiring mutex - solves deadlocks when we
1487 * re-enter the quota code and are already holding the mutex
1489 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) {
1490 inode_incr_space(inode, number, reserve);
1494 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1495 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1496 warntype[cnt] = QUOTA_NL_NOWARN;
1498 spin_lock(&dq_data_lock);
1499 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1500 if (!inode->i_dquot[cnt])
1502 if (check_bdq(inode->i_dquot[cnt], number, !warn, warntype+cnt)
1505 spin_unlock(&dq_data_lock);
1506 goto out_flush_warn;
1509 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1510 if (!inode->i_dquot[cnt])
1513 dquot_resv_space(inode->i_dquot[cnt], number);
1515 dquot_incr_space(inode->i_dquot[cnt], number);
1517 inode_incr_space(inode, number, reserve);
1518 spin_unlock(&dq_data_lock);
1521 goto out_flush_warn;
1522 mark_all_dquot_dirty(inode->i_dquot);
1524 flush_warnings(inode->i_dquot, warntype);
1525 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1529 EXPORT_SYMBOL(__dquot_alloc_space);
1532 * This operation can block, but only after everything is updated
1534 int dquot_alloc_inode(const struct inode *inode)
1536 int cnt, ret = -EDQUOT;
1537 char warntype[MAXQUOTAS];
1539 /* First test before acquiring mutex - solves deadlocks when we
1540 * re-enter the quota code and are already holding the mutex */
1541 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode))
1543 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1544 warntype[cnt] = QUOTA_NL_NOWARN;
1545 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1546 spin_lock(&dq_data_lock);
1547 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1548 if (!inode->i_dquot[cnt])
1550 if (check_idq(inode->i_dquot[cnt], 1, warntype+cnt)
1555 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1556 if (!inode->i_dquot[cnt])
1558 dquot_incr_inodes(inode->i_dquot[cnt], 1);
1562 spin_unlock(&dq_data_lock);
1564 mark_all_dquot_dirty(inode->i_dquot);
1565 flush_warnings(inode->i_dquot, warntype);
1566 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1569 EXPORT_SYMBOL(dquot_alloc_inode);
1572 * Convert in-memory reserved quotas to real consumed quotas
1574 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
1578 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) {
1579 inode_claim_rsv_space(inode, number);
1583 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1584 spin_lock(&dq_data_lock);
1585 /* Claim reserved quotas to allocated quotas */
1586 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1587 if (inode->i_dquot[cnt])
1588 dquot_claim_reserved_space(inode->i_dquot[cnt],
1591 /* Update inode bytes */
1592 inode_claim_rsv_space(inode, number);
1593 spin_unlock(&dq_data_lock);
1594 mark_all_dquot_dirty(inode->i_dquot);
1595 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1598 EXPORT_SYMBOL(dquot_claim_space_nodirty);
1601 * This operation can block, but only after everything is updated
1603 void __dquot_free_space(struct inode *inode, qsize_t number, int reserve)
1606 char warntype[MAXQUOTAS];
1608 /* First test before acquiring mutex - solves deadlocks when we
1609 * re-enter the quota code and are already holding the mutex */
1610 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode)) {
1611 inode_decr_space(inode, number, reserve);
1615 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1616 spin_lock(&dq_data_lock);
1617 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1618 if (!inode->i_dquot[cnt])
1620 warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number);
1622 dquot_free_reserved_space(inode->i_dquot[cnt], number);
1624 dquot_decr_space(inode->i_dquot[cnt], number);
1626 inode_decr_space(inode, number, reserve);
1627 spin_unlock(&dq_data_lock);
1631 mark_all_dquot_dirty(inode->i_dquot);
1633 flush_warnings(inode->i_dquot, warntype);
1634 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1636 EXPORT_SYMBOL(__dquot_free_space);
1639 * This operation can block, but only after everything is updated
1641 void dquot_free_inode(const struct inode *inode)
1644 char warntype[MAXQUOTAS];
1646 /* First test before acquiring mutex - solves deadlocks when we
1647 * re-enter the quota code and are already holding the mutex */
1648 if (!sb_any_quota_active(inode->i_sb) || IS_NOQUOTA(inode))
1651 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1652 spin_lock(&dq_data_lock);
1653 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1654 if (!inode->i_dquot[cnt])
1656 warntype[cnt] = info_idq_free(inode->i_dquot[cnt], 1);
1657 dquot_decr_inodes(inode->i_dquot[cnt], 1);
1659 spin_unlock(&dq_data_lock);
1660 mark_all_dquot_dirty(inode->i_dquot);
1661 flush_warnings(inode->i_dquot, warntype);
1662 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1664 EXPORT_SYMBOL(dquot_free_inode);
1667 * Transfer the number of inode and blocks from one diskquota to an other.
1669 * This operation can block, but only after everything is updated
1670 * A transaction must be started when entering this function.
1672 int dquot_transfer(struct inode *inode, qid_t *chid, unsigned long mask)
1674 qsize_t space, cur_space;
1675 qsize_t rsv_space = 0;
1676 struct dquot *transfer_from[MAXQUOTAS];
1677 struct dquot *transfer_to[MAXQUOTAS];
1678 int cnt, ret = QUOTA_OK;
1679 char warntype_to[MAXQUOTAS];
1680 char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS];
1682 /* First test before acquiring mutex - solves deadlocks when we
1683 * re-enter the quota code and are already holding the mutex */
1684 if (IS_NOQUOTA(inode))
1686 /* Initialize the arrays */
1687 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1688 transfer_from[cnt] = NULL;
1689 transfer_to[cnt] = NULL;
1690 warntype_to[cnt] = QUOTA_NL_NOWARN;
1692 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1693 if (mask & (1 << cnt))
1694 transfer_to[cnt] = dqget(inode->i_sb, chid[cnt], cnt);
1696 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1697 if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
1698 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1701 spin_lock(&dq_data_lock);
1702 cur_space = inode_get_bytes(inode);
1703 rsv_space = inode_get_rsv_space(inode);
1704 space = cur_space + rsv_space;
1705 /* Build the transfer_from list and check the limits */
1706 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1707 if (!transfer_to[cnt])
1709 transfer_from[cnt] = inode->i_dquot[cnt];
1710 if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) ==
1711 NO_QUOTA || check_bdq(transfer_to[cnt], space, 0,
1712 warntype_to + cnt) == NO_QUOTA)
1717 * Finally perform the needed transfer from transfer_from to transfer_to
1719 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1721 * Skip changes for same uid or gid or for turned off quota-type.
1723 if (!transfer_to[cnt])
1726 /* Due to IO error we might not have transfer_from[] structure */
1727 if (transfer_from[cnt]) {
1728 warntype_from_inodes[cnt] =
1729 info_idq_free(transfer_from[cnt], 1);
1730 warntype_from_space[cnt] =
1731 info_bdq_free(transfer_from[cnt], space);
1732 dquot_decr_inodes(transfer_from[cnt], 1);
1733 dquot_decr_space(transfer_from[cnt], cur_space);
1734 dquot_free_reserved_space(transfer_from[cnt],
1738 dquot_incr_inodes(transfer_to[cnt], 1);
1739 dquot_incr_space(transfer_to[cnt], cur_space);
1740 dquot_resv_space(transfer_to[cnt], rsv_space);
1742 inode->i_dquot[cnt] = transfer_to[cnt];
1744 spin_unlock(&dq_data_lock);
1745 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1747 mark_all_dquot_dirty(transfer_from);
1748 mark_all_dquot_dirty(transfer_to);
1749 /* The reference we got is transferred to the inode */
1750 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1751 transfer_to[cnt] = NULL;
1753 flush_warnings(transfer_to, warntype_to);
1754 flush_warnings(transfer_from, warntype_from_inodes);
1755 flush_warnings(transfer_from, warntype_from_space);
1757 dqput_all(transfer_from);
1758 dqput_all(transfer_to);
1761 spin_unlock(&dq_data_lock);
1762 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1763 /* Clear dquot pointers we don't want to dqput() */
1764 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1765 transfer_from[cnt] = NULL;
1769 EXPORT_SYMBOL(dquot_transfer);
1771 /* Wrapper for transferring ownership of an inode for uid/gid only
1772 * Called from FSXXX_setattr()
1774 int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
1776 qid_t chid[MAXQUOTAS];
1777 unsigned long mask = 0;
1779 if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) {
1780 mask |= 1 << USRQUOTA;
1781 chid[USRQUOTA] = iattr->ia_uid;
1783 if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid) {
1784 mask |= 1 << GRPQUOTA;
1785 chid[GRPQUOTA] = iattr->ia_gid;
1787 if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) {
1789 if (inode->i_sb->dq_op->transfer(inode, chid, mask) == NO_QUOTA)
1794 EXPORT_SYMBOL(vfs_dq_transfer);
1797 * Write info of quota file to disk
1799 int dquot_commit_info(struct super_block *sb, int type)
1802 struct quota_info *dqopt = sb_dqopt(sb);
1804 mutex_lock(&dqopt->dqio_mutex);
1805 ret = dqopt->ops[type]->write_file_info(sb, type);
1806 mutex_unlock(&dqopt->dqio_mutex);
1809 EXPORT_SYMBOL(dquot_commit_info);
1812 * Definitions of diskquota operations.
1814 const struct dquot_operations dquot_operations = {
1815 .initialize = dquot_initialize,
1817 .transfer = dquot_transfer,
1818 .write_dquot = dquot_commit,
1819 .acquire_dquot = dquot_acquire,
1820 .release_dquot = dquot_release,
1821 .mark_dirty = dquot_mark_dquot_dirty,
1822 .write_info = dquot_commit_info,
1823 .alloc_dquot = dquot_alloc,
1824 .destroy_dquot = dquot_destroy,
1828 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1830 int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags)
1833 struct quota_info *dqopt = sb_dqopt(sb);
1834 struct inode *toputinode[MAXQUOTAS];
1836 /* Cannot turn off usage accounting without turning off limits, or
1837 * suspend quotas and simultaneously turn quotas off. */
1838 if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED))
1839 || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED |
1840 DQUOT_USAGE_ENABLED)))
1843 /* We need to serialize quota_off() for device */
1844 mutex_lock(&dqopt->dqonoff_mutex);
1847 * Skip everything if there's nothing to do. We have to do this because
1848 * sometimes we are called when fill_super() failed and calling
1849 * sync_fs() in such cases does no good.
1851 if (!sb_any_quota_loaded(sb)) {
1852 mutex_unlock(&dqopt->dqonoff_mutex);
1855 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1856 toputinode[cnt] = NULL;
1857 if (type != -1 && cnt != type)
1859 if (!sb_has_quota_loaded(sb, cnt))
1862 if (flags & DQUOT_SUSPENDED) {
1863 spin_lock(&dq_state_lock);
1865 dquot_state_flag(DQUOT_SUSPENDED, cnt);
1866 spin_unlock(&dq_state_lock);
1868 spin_lock(&dq_state_lock);
1869 dqopt->flags &= ~dquot_state_flag(flags, cnt);
1870 /* Turning off suspended quotas? */
1871 if (!sb_has_quota_loaded(sb, cnt) &&
1872 sb_has_quota_suspended(sb, cnt)) {
1873 dqopt->flags &= ~dquot_state_flag(
1874 DQUOT_SUSPENDED, cnt);
1875 spin_unlock(&dq_state_lock);
1876 iput(dqopt->files[cnt]);
1877 dqopt->files[cnt] = NULL;
1880 spin_unlock(&dq_state_lock);
1883 /* We still have to keep quota loaded? */
1884 if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED))
1887 /* Note: these are blocking operations */
1888 drop_dquot_ref(sb, cnt);
1889 invalidate_dquots(sb, cnt);
1891 * Now all dquots should be invalidated, all writes done so we
1892 * should be only users of the info. No locks needed.
1894 if (info_dirty(&dqopt->info[cnt]))
1895 sb->dq_op->write_info(sb, cnt);
1896 if (dqopt->ops[cnt]->free_file_info)
1897 dqopt->ops[cnt]->free_file_info(sb, cnt);
1898 put_quota_format(dqopt->info[cnt].dqi_format);
1900 toputinode[cnt] = dqopt->files[cnt];
1901 if (!sb_has_quota_loaded(sb, cnt))
1902 dqopt->files[cnt] = NULL;
1903 dqopt->info[cnt].dqi_flags = 0;
1904 dqopt->info[cnt].dqi_igrace = 0;
1905 dqopt->info[cnt].dqi_bgrace = 0;
1906 dqopt->ops[cnt] = NULL;
1908 mutex_unlock(&dqopt->dqonoff_mutex);
1910 /* Skip syncing and setting flags if quota files are hidden */
1911 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
1914 /* Sync the superblock so that buffers with quota data are written to
1915 * disk (and so userspace sees correct data afterwards). */
1916 if (sb->s_op->sync_fs)
1917 sb->s_op->sync_fs(sb, 1);
1918 sync_blockdev(sb->s_bdev);
1919 /* Now the quota files are just ordinary files and we can set the
1920 * inode flags back. Moreover we discard the pagecache so that
1921 * userspace sees the writes we did bypassing the pagecache. We
1922 * must also discard the blockdev buffers so that we see the
1923 * changes done by userspace on the next quotaon() */
1924 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1925 if (toputinode[cnt]) {
1926 mutex_lock(&dqopt->dqonoff_mutex);
1927 /* If quota was reenabled in the meantime, we have
1929 if (!sb_has_quota_loaded(sb, cnt)) {
1930 mutex_lock_nested(&toputinode[cnt]->i_mutex,
1932 toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
1933 S_NOATIME | S_NOQUOTA);
1934 truncate_inode_pages(&toputinode[cnt]->i_data,
1936 mutex_unlock(&toputinode[cnt]->i_mutex);
1937 mark_inode_dirty(toputinode[cnt]);
1939 mutex_unlock(&dqopt->dqonoff_mutex);
1942 invalidate_bdev(sb->s_bdev);
1944 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1945 if (toputinode[cnt]) {
1946 /* On remount RO, we keep the inode pointer so that we
1947 * can reenable quota on the subsequent remount RW. We
1948 * have to check 'flags' variable and not use sb_has_
1949 * function because another quotaon / quotaoff could
1950 * change global state before we got here. We refuse
1951 * to suspend quotas when there is pending delete on
1952 * the quota file... */
1953 if (!(flags & DQUOT_SUSPENDED))
1954 iput(toputinode[cnt]);
1955 else if (!toputinode[cnt]->i_nlink)
1960 EXPORT_SYMBOL(vfs_quota_disable);
1962 int vfs_quota_off(struct super_block *sb, int type, int remount)
1964 return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED :
1965 (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED));
1967 EXPORT_SYMBOL(vfs_quota_off);
1969 * Turn quotas on on a device
1973 * Helper function to turn quotas on when we already have the inode of
1974 * quota file and no quota information is loaded.
1976 static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
1979 struct quota_format_type *fmt = find_quota_format(format_id);
1980 struct super_block *sb = inode->i_sb;
1981 struct quota_info *dqopt = sb_dqopt(sb);
1987 if (!S_ISREG(inode->i_mode)) {
1991 if (IS_RDONLY(inode)) {
1995 if (!sb->s_op->quota_write || !sb->s_op->quota_read) {
1999 /* Usage always has to be set... */
2000 if (!(flags & DQUOT_USAGE_ENABLED)) {
2005 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2006 /* As we bypass the pagecache we must now flush all the
2007 * dirty data and invalidate caches so that kernel sees
2008 * changes from userspace. It is not enough to just flush
2009 * the quota file since if blocksize < pagesize, invalidation
2010 * of the cache could fail because of other unrelated dirty
2012 sync_filesystem(sb);
2013 invalidate_bdev(sb->s_bdev);
2015 mutex_lock(&dqopt->dqonoff_mutex);
2016 if (sb_has_quota_loaded(sb, type)) {
2021 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2022 /* We don't want quota and atime on quota files (deadlocks
2023 * possible) Also nobody should write to the file - we use
2024 * special IO operations which ignore the immutable bit. */
2025 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2026 oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE |
2028 inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
2029 mutex_unlock(&inode->i_mutex);
2031 * When S_NOQUOTA is set, remove dquot references as no more
2032 * references can be added
2034 sb->dq_op->drop(inode);
2038 dqopt->files[type] = igrab(inode);
2039 if (!dqopt->files[type])
2042 if (!fmt->qf_ops->check_quota_file(sb, type))
2045 dqopt->ops[type] = fmt->qf_ops;
2046 dqopt->info[type].dqi_format = fmt;
2047 dqopt->info[type].dqi_fmt_id = format_id;
2048 INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
2049 mutex_lock(&dqopt->dqio_mutex);
2050 error = dqopt->ops[type]->read_file_info(sb, type);
2052 mutex_unlock(&dqopt->dqio_mutex);
2055 mutex_unlock(&dqopt->dqio_mutex);
2056 spin_lock(&dq_state_lock);
2057 dqopt->flags |= dquot_state_flag(flags, type);
2058 spin_unlock(&dq_state_lock);
2060 add_dquot_ref(sb, type);
2061 mutex_unlock(&dqopt->dqonoff_mutex);
2066 dqopt->files[type] = NULL;
2069 if (oldflags != -1) {
2070 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2071 /* Set the flags back (in the case of accidental quotaon()
2072 * on a wrong file we don't want to mess up the flags) */
2073 inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
2074 inode->i_flags |= oldflags;
2075 mutex_unlock(&inode->i_mutex);
2077 mutex_unlock(&dqopt->dqonoff_mutex);
2079 put_quota_format(fmt);
2084 /* Reenable quotas on remount RW */
2085 static int vfs_quota_on_remount(struct super_block *sb, int type)
2087 struct quota_info *dqopt = sb_dqopt(sb);
2088 struct inode *inode;
2092 mutex_lock(&dqopt->dqonoff_mutex);
2093 if (!sb_has_quota_suspended(sb, type)) {
2094 mutex_unlock(&dqopt->dqonoff_mutex);
2097 inode = dqopt->files[type];
2098 dqopt->files[type] = NULL;
2099 spin_lock(&dq_state_lock);
2100 flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
2101 DQUOT_LIMITS_ENABLED, type);
2102 dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type);
2103 spin_unlock(&dq_state_lock);
2104 mutex_unlock(&dqopt->dqonoff_mutex);
2106 flags = dquot_generic_flag(flags, type);
2107 ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id,
2114 int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
2117 int error = security_quota_on(path->dentry);
2120 /* Quota file not on the same filesystem? */
2121 if (path->mnt->mnt_sb != sb)
2124 error = vfs_load_quota_inode(path->dentry->d_inode, type,
2125 format_id, DQUOT_USAGE_ENABLED |
2126 DQUOT_LIMITS_ENABLED);
2129 EXPORT_SYMBOL(vfs_quota_on_path);
2131 int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name,
2138 return vfs_quota_on_remount(sb, type);
2140 error = kern_path(name, LOOKUP_FOLLOW, &path);
2142 error = vfs_quota_on_path(sb, type, format_id, &path);
2147 EXPORT_SYMBOL(vfs_quota_on);
2150 * More powerful function for turning on quotas allowing setting
2151 * of individual quota flags
2153 int vfs_quota_enable(struct inode *inode, int type, int format_id,
2157 struct super_block *sb = inode->i_sb;
2158 struct quota_info *dqopt = sb_dqopt(sb);
2160 /* Just unsuspend quotas? */
2161 if (flags & DQUOT_SUSPENDED)
2162 return vfs_quota_on_remount(sb, type);
2165 /* Just updating flags needed? */
2166 if (sb_has_quota_loaded(sb, type)) {
2167 mutex_lock(&dqopt->dqonoff_mutex);
2168 /* Now do a reliable test... */
2169 if (!sb_has_quota_loaded(sb, type)) {
2170 mutex_unlock(&dqopt->dqonoff_mutex);
2173 if (flags & DQUOT_USAGE_ENABLED &&
2174 sb_has_quota_usage_enabled(sb, type)) {
2178 if (flags & DQUOT_LIMITS_ENABLED &&
2179 sb_has_quota_limits_enabled(sb, type)) {
2183 spin_lock(&dq_state_lock);
2184 sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
2185 spin_unlock(&dq_state_lock);
2187 mutex_unlock(&dqopt->dqonoff_mutex);
2192 return vfs_load_quota_inode(inode, type, format_id, flags);
2194 EXPORT_SYMBOL(vfs_quota_enable);
2197 * This function is used when filesystem needs to initialize quotas
2198 * during mount time.
2200 int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
2201 int format_id, int type)
2203 struct dentry *dentry;
2206 mutex_lock(&sb->s_root->d_inode->i_mutex);
2207 dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
2208 mutex_unlock(&sb->s_root->d_inode->i_mutex);
2210 return PTR_ERR(dentry);
2212 if (!dentry->d_inode) {
2217 error = security_quota_on(dentry);
2219 error = vfs_load_quota_inode(dentry->d_inode, type, format_id,
2220 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
2226 EXPORT_SYMBOL(vfs_quota_on_mount);
2228 /* Wrapper to turn on quotas when remounting rw */
2229 int vfs_dq_quota_on_remount(struct super_block *sb)
2234 if (!sb->s_qcop || !sb->s_qcop->quota_on)
2236 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
2237 err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1);
2238 if (err < 0 && !ret)
2243 EXPORT_SYMBOL(vfs_dq_quota_on_remount);
2245 static inline qsize_t qbtos(qsize_t blocks)
2247 return blocks << QIF_DQBLKSIZE_BITS;
2250 static inline qsize_t stoqb(qsize_t space)
2252 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
2255 /* Generic routine for getting common part of quota structure */
2256 static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di)
2258 struct mem_dqblk *dm = &dquot->dq_dqb;
2260 spin_lock(&dq_data_lock);
2261 di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit);
2262 di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit);
2263 di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace;
2264 di->dqb_ihardlimit = dm->dqb_ihardlimit;
2265 di->dqb_isoftlimit = dm->dqb_isoftlimit;
2266 di->dqb_curinodes = dm->dqb_curinodes;
2267 di->dqb_btime = dm->dqb_btime;
2268 di->dqb_itime = dm->dqb_itime;
2269 di->dqb_valid = QIF_ALL;
2270 spin_unlock(&dq_data_lock);
2273 int vfs_get_dqblk(struct super_block *sb, int type, qid_t id,
2274 struct if_dqblk *di)
2276 struct dquot *dquot;
2278 dquot = dqget(sb, id, type);
2281 do_get_dqblk(dquot, di);
2286 EXPORT_SYMBOL(vfs_get_dqblk);
2288 /* Generic routine for setting common part of quota structure */
2289 static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
2291 struct mem_dqblk *dm = &dquot->dq_dqb;
2292 int check_blim = 0, check_ilim = 0;
2293 struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
2295 if ((di->dqb_valid & QIF_BLIMITS &&
2296 (di->dqb_bhardlimit > dqi->dqi_maxblimit ||
2297 di->dqb_bsoftlimit > dqi->dqi_maxblimit)) ||
2298 (di->dqb_valid & QIF_ILIMITS &&
2299 (di->dqb_ihardlimit > dqi->dqi_maxilimit ||
2300 di->dqb_isoftlimit > dqi->dqi_maxilimit)))
2303 spin_lock(&dq_data_lock);
2304 if (di->dqb_valid & QIF_SPACE) {
2305 dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace;
2307 __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
2309 if (di->dqb_valid & QIF_BLIMITS) {
2310 dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit);
2311 dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit);
2313 __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
2315 if (di->dqb_valid & QIF_INODES) {
2316 dm->dqb_curinodes = di->dqb_curinodes;
2318 __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
2320 if (di->dqb_valid & QIF_ILIMITS) {
2321 dm->dqb_isoftlimit = di->dqb_isoftlimit;
2322 dm->dqb_ihardlimit = di->dqb_ihardlimit;
2324 __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
2326 if (di->dqb_valid & QIF_BTIME) {
2327 dm->dqb_btime = di->dqb_btime;
2329 __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
2331 if (di->dqb_valid & QIF_ITIME) {
2332 dm->dqb_itime = di->dqb_itime;
2334 __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
2338 if (!dm->dqb_bsoftlimit ||
2339 dm->dqb_curspace < dm->dqb_bsoftlimit) {
2341 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
2342 } else if (!(di->dqb_valid & QIF_BTIME))
2343 /* Set grace only if user hasn't provided his own... */
2344 dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
2347 if (!dm->dqb_isoftlimit ||
2348 dm->dqb_curinodes < dm->dqb_isoftlimit) {
2350 clear_bit(DQ_INODES_B, &dquot->dq_flags);
2351 } else if (!(di->dqb_valid & QIF_ITIME))
2352 /* Set grace only if user hasn't provided his own... */
2353 dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
2355 if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit ||
2357 clear_bit(DQ_FAKE_B, &dquot->dq_flags);
2359 set_bit(DQ_FAKE_B, &dquot->dq_flags);
2360 spin_unlock(&dq_data_lock);
2361 mark_dquot_dirty(dquot);
2366 int vfs_set_dqblk(struct super_block *sb, int type, qid_t id,
2367 struct if_dqblk *di)
2369 struct dquot *dquot;
2372 dquot = dqget(sb, id, type);
2377 rc = do_set_dqblk(dquot, di);
2382 EXPORT_SYMBOL(vfs_set_dqblk);
2384 /* Generic routine for getting common part of quota file information */
2385 int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2387 struct mem_dqinfo *mi;
2389 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2390 if (!sb_has_quota_active(sb, type)) {
2391 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2394 mi = sb_dqopt(sb)->info + type;
2395 spin_lock(&dq_data_lock);
2396 ii->dqi_bgrace = mi->dqi_bgrace;
2397 ii->dqi_igrace = mi->dqi_igrace;
2398 ii->dqi_flags = mi->dqi_flags & DQF_MASK;
2399 ii->dqi_valid = IIF_ALL;
2400 spin_unlock(&dq_data_lock);
2401 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2404 EXPORT_SYMBOL(vfs_get_dqinfo);
2406 /* Generic routine for setting common part of quota file information */
2407 int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2409 struct mem_dqinfo *mi;
2412 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2413 if (!sb_has_quota_active(sb, type)) {
2417 mi = sb_dqopt(sb)->info + type;
2418 spin_lock(&dq_data_lock);
2419 if (ii->dqi_valid & IIF_BGRACE)
2420 mi->dqi_bgrace = ii->dqi_bgrace;
2421 if (ii->dqi_valid & IIF_IGRACE)
2422 mi->dqi_igrace = ii->dqi_igrace;
2423 if (ii->dqi_valid & IIF_FLAGS)
2424 mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) |
2425 (ii->dqi_flags & DQF_MASK);
2426 spin_unlock(&dq_data_lock);
2427 mark_info_dirty(sb, type);
2428 /* Force write to disk */
2429 sb->dq_op->write_info(sb, type);
2431 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2434 EXPORT_SYMBOL(vfs_set_dqinfo);
2436 const struct quotactl_ops vfs_quotactl_ops = {
2437 .quota_on = vfs_quota_on,
2438 .quota_off = vfs_quota_off,
2439 .quota_sync = vfs_quota_sync,
2440 .get_info = vfs_get_dqinfo,
2441 .set_info = vfs_set_dqinfo,
2442 .get_dqblk = vfs_get_dqblk,
2443 .set_dqblk = vfs_set_dqblk
2446 static ctl_table fs_dqstats_table[] = {
2448 .procname = "lookups",
2449 .data = &dqstats.lookups,
2450 .maxlen = sizeof(int),
2452 .proc_handler = proc_dointvec,
2455 .procname = "drops",
2456 .data = &dqstats.drops,
2457 .maxlen = sizeof(int),
2459 .proc_handler = proc_dointvec,
2462 .procname = "reads",
2463 .data = &dqstats.reads,
2464 .maxlen = sizeof(int),
2466 .proc_handler = proc_dointvec,
2469 .procname = "writes",
2470 .data = &dqstats.writes,
2471 .maxlen = sizeof(int),
2473 .proc_handler = proc_dointvec,
2476 .procname = "cache_hits",
2477 .data = &dqstats.cache_hits,
2478 .maxlen = sizeof(int),
2480 .proc_handler = proc_dointvec,
2483 .procname = "allocated_dquots",
2484 .data = &dqstats.allocated_dquots,
2485 .maxlen = sizeof(int),
2487 .proc_handler = proc_dointvec,
2490 .procname = "free_dquots",
2491 .data = &dqstats.free_dquots,
2492 .maxlen = sizeof(int),
2494 .proc_handler = proc_dointvec,
2497 .procname = "syncs",
2498 .data = &dqstats.syncs,
2499 .maxlen = sizeof(int),
2501 .proc_handler = proc_dointvec,
2503 #ifdef CONFIG_PRINT_QUOTA_WARNING
2505 .procname = "warnings",
2506 .data = &flag_print_warnings,
2507 .maxlen = sizeof(int),
2509 .proc_handler = proc_dointvec,
2515 static ctl_table fs_table[] = {
2517 .procname = "quota",
2519 .child = fs_dqstats_table,
2524 static ctl_table sys_table[] = {
2533 static int __init dquot_init(void)
2536 unsigned long nr_hash, order;
2538 printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
2540 register_sysctl_table(sys_table);
2542 dquot_cachep = kmem_cache_create("dquot",
2543 sizeof(struct dquot), sizeof(unsigned long) * 4,
2544 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
2545 SLAB_MEM_SPREAD|SLAB_PANIC),
2549 dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
2551 panic("Cannot create dquot hash table");
2553 /* Find power-of-two hlist_heads which can fit into allocation */
2554 nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
2558 } while (nr_hash >> dq_hash_bits);
2561 nr_hash = 1UL << dq_hash_bits;
2562 dq_hash_mask = nr_hash - 1;
2563 for (i = 0; i < nr_hash; i++)
2564 INIT_HLIST_HEAD(dquot_hash + i);
2566 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2567 nr_hash, order, (PAGE_SIZE << order));
2569 register_shrinker(&dqcache_shrinker);
2573 module_init(dquot_init);