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 * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
105 * for altering the flag i_mutex is also needed).
107 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
108 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
109 * Currently dquot is locked only when it is being read to memory (or space for
110 * it is being allocated) on the first dqget() and when it is being released on
111 * the last dqput(). The allocation and release oparations are serialized by
112 * the dq_lock and by checking the use count in dquot_release(). Write
113 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
114 * spinlock to internal buffers before writing.
116 * Lock ordering (including related VFS locks) is the following:
117 * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
119 * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
120 * dqptr_sem. But filesystem has to count with the fact that functions such as
121 * dquot_alloc_space() acquire dqptr_sem and they usually have to be called
122 * from inside a transaction to keep filesystem consistency after a crash. Also
123 * filesystems usually want to do some IO on dquot from ->mark_dirty which is
124 * called with dqptr_sem held.
125 * i_mutex on quota files is special (it's below dqio_mutex)
128 static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock);
129 static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock);
130 __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock);
131 EXPORT_SYMBOL(dq_data_lock);
133 static char *quotatypes[] = INITQFNAMES;
134 static struct quota_format_type *quota_formats; /* List of registered formats */
135 static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES;
137 /* SLAB cache for dquot structures */
138 static struct kmem_cache *dquot_cachep;
140 int register_quota_format(struct quota_format_type *fmt)
142 spin_lock(&dq_list_lock);
143 fmt->qf_next = quota_formats;
145 spin_unlock(&dq_list_lock);
148 EXPORT_SYMBOL(register_quota_format);
150 void unregister_quota_format(struct quota_format_type *fmt)
152 struct quota_format_type **actqf;
154 spin_lock(&dq_list_lock);
155 for (actqf = "a_formats; *actqf && *actqf != fmt;
156 actqf = &(*actqf)->qf_next)
159 *actqf = (*actqf)->qf_next;
160 spin_unlock(&dq_list_lock);
162 EXPORT_SYMBOL(unregister_quota_format);
164 static struct quota_format_type *find_quota_format(int id)
166 struct quota_format_type *actqf;
168 spin_lock(&dq_list_lock);
169 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id;
170 actqf = actqf->qf_next)
172 if (!actqf || !try_module_get(actqf->qf_owner)) {
175 spin_unlock(&dq_list_lock);
177 for (qm = 0; module_names[qm].qm_fmt_id &&
178 module_names[qm].qm_fmt_id != id; qm++)
180 if (!module_names[qm].qm_fmt_id ||
181 request_module(module_names[qm].qm_mod_name))
184 spin_lock(&dq_list_lock);
185 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id;
186 actqf = actqf->qf_next)
188 if (actqf && !try_module_get(actqf->qf_owner))
191 spin_unlock(&dq_list_lock);
195 static void put_quota_format(struct quota_format_type *fmt)
197 module_put(fmt->qf_owner);
201 * Dquot List Management:
202 * The quota code uses three lists for dquot management: the inuse_list,
203 * free_dquots, and dquot_hash[] array. A single dquot structure may be
204 * on all three lists, depending on its current state.
206 * All dquots are placed to the end of inuse_list when first created, and this
207 * list is used for invalidate operation, which must look at every dquot.
209 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
210 * and this list is searched whenever we need an available dquot. Dquots are
211 * removed from the list as soon as they are used again, and
212 * dqstats.free_dquots gives the number of dquots on the list. When
213 * dquot is invalidated it's completely released from memory.
215 * Dquots with a specific identity (device, type and id) are placed on
216 * one of the dquot_hash[] hash chains. The provides an efficient search
217 * mechanism to locate a specific dquot.
220 static LIST_HEAD(inuse_list);
221 static LIST_HEAD(free_dquots);
222 static unsigned int dq_hash_bits, dq_hash_mask;
223 static struct hlist_head *dquot_hash;
225 struct dqstats dqstats;
226 EXPORT_SYMBOL(dqstats);
228 static inline unsigned int
229 hashfn(const struct super_block *sb, unsigned int id, int type)
233 tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
234 return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
238 * Following list functions expect dq_list_lock to be held
240 static inline void insert_dquot_hash(struct dquot *dquot)
242 struct hlist_head *head;
243 head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type);
244 hlist_add_head(&dquot->dq_hash, head);
247 static inline void remove_dquot_hash(struct dquot *dquot)
249 hlist_del_init(&dquot->dq_hash);
252 static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb,
253 unsigned int id, int type)
255 struct hlist_node *node;
258 hlist_for_each (node, dquot_hash+hashent) {
259 dquot = hlist_entry(node, struct dquot, dq_hash);
260 if (dquot->dq_sb == sb && dquot->dq_id == id &&
261 dquot->dq_type == type)
267 /* Add a dquot to the tail of the free list */
268 static inline void put_dquot_last(struct dquot *dquot)
270 list_add_tail(&dquot->dq_free, &free_dquots);
271 dqstats.free_dquots++;
274 static inline void remove_free_dquot(struct dquot *dquot)
276 if (list_empty(&dquot->dq_free))
278 list_del_init(&dquot->dq_free);
279 dqstats.free_dquots--;
282 static inline void put_inuse(struct dquot *dquot)
284 /* We add to the back of inuse list so we don't have to restart
285 * when traversing this list and we block */
286 list_add_tail(&dquot->dq_inuse, &inuse_list);
287 dqstats.allocated_dquots++;
290 static inline void remove_inuse(struct dquot *dquot)
292 dqstats.allocated_dquots--;
293 list_del(&dquot->dq_inuse);
296 * End of list functions needing dq_list_lock
299 static void wait_on_dquot(struct dquot *dquot)
301 mutex_lock(&dquot->dq_lock);
302 mutex_unlock(&dquot->dq_lock);
305 static inline int dquot_dirty(struct dquot *dquot)
307 return test_bit(DQ_MOD_B, &dquot->dq_flags);
310 static inline int mark_dquot_dirty(struct dquot *dquot)
312 return dquot->dq_sb->dq_op->mark_dirty(dquot);
315 int dquot_mark_dquot_dirty(struct dquot *dquot)
317 spin_lock(&dq_list_lock);
318 if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags))
319 list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
320 info[dquot->dq_type].dqi_dirty_list);
321 spin_unlock(&dq_list_lock);
324 EXPORT_SYMBOL(dquot_mark_dquot_dirty);
326 /* This function needs dq_list_lock */
327 static inline int clear_dquot_dirty(struct dquot *dquot)
329 if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
331 list_del_init(&dquot->dq_dirty);
335 void mark_info_dirty(struct super_block *sb, int type)
337 set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
339 EXPORT_SYMBOL(mark_info_dirty);
342 * Read dquot from disk and alloc space for it
345 int dquot_acquire(struct dquot *dquot)
347 int ret = 0, ret2 = 0;
348 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
350 mutex_lock(&dquot->dq_lock);
351 mutex_lock(&dqopt->dqio_mutex);
352 if (!test_bit(DQ_READ_B, &dquot->dq_flags))
353 ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
356 set_bit(DQ_READ_B, &dquot->dq_flags);
357 /* Instantiate dquot if needed */
358 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
359 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
360 /* Write the info if needed */
361 if (info_dirty(&dqopt->info[dquot->dq_type])) {
362 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(
363 dquot->dq_sb, dquot->dq_type);
372 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
374 mutex_unlock(&dqopt->dqio_mutex);
375 mutex_unlock(&dquot->dq_lock);
378 EXPORT_SYMBOL(dquot_acquire);
381 * Write dquot to disk
383 int dquot_commit(struct dquot *dquot)
385 int ret = 0, ret2 = 0;
386 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
388 mutex_lock(&dqopt->dqio_mutex);
389 spin_lock(&dq_list_lock);
390 if (!clear_dquot_dirty(dquot)) {
391 spin_unlock(&dq_list_lock);
394 spin_unlock(&dq_list_lock);
395 /* Inactive dquot can be only if there was error during read/init
396 * => we have better not writing it */
397 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
398 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
399 if (info_dirty(&dqopt->info[dquot->dq_type])) {
400 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(
401 dquot->dq_sb, dquot->dq_type);
407 mutex_unlock(&dqopt->dqio_mutex);
410 EXPORT_SYMBOL(dquot_commit);
415 int dquot_release(struct dquot *dquot)
417 int ret = 0, ret2 = 0;
418 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
420 mutex_lock(&dquot->dq_lock);
421 /* Check whether we are not racing with some other dqget() */
422 if (atomic_read(&dquot->dq_count) > 1)
424 mutex_lock(&dqopt->dqio_mutex);
425 if (dqopt->ops[dquot->dq_type]->release_dqblk) {
426 ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
428 if (info_dirty(&dqopt->info[dquot->dq_type])) {
429 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(
430 dquot->dq_sb, dquot->dq_type);
435 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
436 mutex_unlock(&dqopt->dqio_mutex);
438 mutex_unlock(&dquot->dq_lock);
441 EXPORT_SYMBOL(dquot_release);
443 void dquot_destroy(struct dquot *dquot)
445 kmem_cache_free(dquot_cachep, dquot);
447 EXPORT_SYMBOL(dquot_destroy);
449 static inline void do_destroy_dquot(struct dquot *dquot)
451 dquot->dq_sb->dq_op->destroy_dquot(dquot);
454 /* Invalidate all dquots on the list. Note that this function is called after
455 * quota is disabled and pointers from inodes removed so there cannot be new
456 * quota users. There can still be some users of quotas due to inodes being
457 * just deleted or pruned by prune_icache() (those are not attached to any
458 * list) or parallel quotactl call. We have to wait for such users.
460 static void invalidate_dquots(struct super_block *sb, int type)
462 struct dquot *dquot, *tmp;
465 spin_lock(&dq_list_lock);
466 list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
467 if (dquot->dq_sb != sb)
469 if (dquot->dq_type != type)
471 /* Wait for dquot users */
472 if (atomic_read(&dquot->dq_count)) {
475 atomic_inc(&dquot->dq_count);
476 prepare_to_wait(&dquot->dq_wait_unused, &wait,
477 TASK_UNINTERRUPTIBLE);
478 spin_unlock(&dq_list_lock);
479 /* Once dqput() wakes us up, we know it's time to free
481 * IMPORTANT: we rely on the fact that there is always
482 * at most one process waiting for dquot to free.
483 * Otherwise dq_count would be > 1 and we would never
486 if (atomic_read(&dquot->dq_count) > 1)
488 finish_wait(&dquot->dq_wait_unused, &wait);
490 /* At this moment dquot() need not exist (it could be
491 * reclaimed by prune_dqcache(). Hence we must
496 * Quota now has no users and it has been written on last
499 remove_dquot_hash(dquot);
500 remove_free_dquot(dquot);
502 do_destroy_dquot(dquot);
504 spin_unlock(&dq_list_lock);
507 /* Call callback for every active dquot on given filesystem */
508 int dquot_scan_active(struct super_block *sb,
509 int (*fn)(struct dquot *dquot, unsigned long priv),
512 struct dquot *dquot, *old_dquot = NULL;
515 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
516 spin_lock(&dq_list_lock);
517 list_for_each_entry(dquot, &inuse_list, dq_inuse) {
518 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
520 if (dquot->dq_sb != sb)
522 /* Now we have active dquot so we can just increase use count */
523 atomic_inc(&dquot->dq_count);
525 spin_unlock(&dq_list_lock);
528 ret = fn(dquot, priv);
531 spin_lock(&dq_list_lock);
532 /* We are safe to continue now because our dquot could not
533 * be moved out of the inuse list while we hold the reference */
535 spin_unlock(&dq_list_lock);
538 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
541 EXPORT_SYMBOL(dquot_scan_active);
543 int vfs_quota_sync(struct super_block *sb, int type)
545 struct list_head *dirty;
547 struct quota_info *dqopt = sb_dqopt(sb);
550 mutex_lock(&dqopt->dqonoff_mutex);
551 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
552 if (type != -1 && cnt != type)
554 if (!sb_has_quota_active(sb, cnt))
556 spin_lock(&dq_list_lock);
557 dirty = &dqopt->info[cnt].dqi_dirty_list;
558 while (!list_empty(dirty)) {
559 dquot = list_first_entry(dirty, struct dquot,
561 /* Dirty and inactive can be only bad dquot... */
562 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
563 clear_dquot_dirty(dquot);
566 /* Now we have active dquot from which someone is
567 * holding reference so we can safely just increase
569 atomic_inc(&dquot->dq_count);
571 spin_unlock(&dq_list_lock);
572 sb->dq_op->write_dquot(dquot);
574 spin_lock(&dq_list_lock);
576 spin_unlock(&dq_list_lock);
579 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
580 if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt)
581 && info_dirty(&dqopt->info[cnt]))
582 sb->dq_op->write_info(sb, cnt);
583 spin_lock(&dq_list_lock);
585 spin_unlock(&dq_list_lock);
586 mutex_unlock(&dqopt->dqonoff_mutex);
590 EXPORT_SYMBOL(vfs_quota_sync);
592 /* Free unused dquots from cache */
593 static void prune_dqcache(int count)
595 struct list_head *head;
598 head = free_dquots.prev;
599 while (head != &free_dquots && count) {
600 dquot = list_entry(head, struct dquot, dq_free);
601 remove_dquot_hash(dquot);
602 remove_free_dquot(dquot);
604 do_destroy_dquot(dquot);
606 head = free_dquots.prev;
611 * This is called from kswapd when we think we need some
615 static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
618 spin_lock(&dq_list_lock);
620 spin_unlock(&dq_list_lock);
622 return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure;
625 static struct shrinker dqcache_shrinker = {
626 .shrink = shrink_dqcache_memory,
627 .seeks = DEFAULT_SEEKS,
631 * Put reference to dquot
632 * NOTE: If you change this function please check whether dqput_blocks() works right...
634 void dqput(struct dquot *dquot)
640 #ifdef __DQUOT_PARANOIA
641 if (!atomic_read(&dquot->dq_count)) {
642 printk("VFS: dqput: trying to free free dquot\n");
643 printk("VFS: device %s, dquot of %s %d\n",
645 quotatypes[dquot->dq_type],
651 spin_lock(&dq_list_lock);
653 spin_unlock(&dq_list_lock);
655 spin_lock(&dq_list_lock);
656 if (atomic_read(&dquot->dq_count) > 1) {
657 /* We have more than one user... nothing to do */
658 atomic_dec(&dquot->dq_count);
659 /* Releasing dquot during quotaoff phase? */
660 if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) &&
661 atomic_read(&dquot->dq_count) == 1)
662 wake_up(&dquot->dq_wait_unused);
663 spin_unlock(&dq_list_lock);
666 /* Need to release dquot? */
667 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
668 spin_unlock(&dq_list_lock);
669 /* Commit dquot before releasing */
670 ret = dquot->dq_sb->dq_op->write_dquot(dquot);
672 printk(KERN_ERR "VFS: cannot write quota structure on "
673 "device %s (error %d). Quota may get out of "
674 "sync!\n", dquot->dq_sb->s_id, ret);
676 * We clear dirty bit anyway, so that we avoid
679 spin_lock(&dq_list_lock);
680 clear_dquot_dirty(dquot);
681 spin_unlock(&dq_list_lock);
685 /* Clear flag in case dquot was inactive (something bad happened) */
686 clear_dquot_dirty(dquot);
687 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
688 spin_unlock(&dq_list_lock);
689 dquot->dq_sb->dq_op->release_dquot(dquot);
692 atomic_dec(&dquot->dq_count);
693 #ifdef __DQUOT_PARANOIA
695 BUG_ON(!list_empty(&dquot->dq_free));
697 put_dquot_last(dquot);
698 spin_unlock(&dq_list_lock);
700 EXPORT_SYMBOL(dqput);
702 struct dquot *dquot_alloc(struct super_block *sb, int type)
704 return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
706 EXPORT_SYMBOL(dquot_alloc);
708 static struct dquot *get_empty_dquot(struct super_block *sb, int type)
712 dquot = sb->dq_op->alloc_dquot(sb, type);
716 mutex_init(&dquot->dq_lock);
717 INIT_LIST_HEAD(&dquot->dq_free);
718 INIT_LIST_HEAD(&dquot->dq_inuse);
719 INIT_HLIST_NODE(&dquot->dq_hash);
720 INIT_LIST_HEAD(&dquot->dq_dirty);
721 init_waitqueue_head(&dquot->dq_wait_unused);
723 dquot->dq_type = type;
724 atomic_set(&dquot->dq_count, 1);
730 * Get reference to dquot
732 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
733 * destroying our dquot by:
734 * a) checking for quota flags under dq_list_lock and
735 * b) getting a reference to dquot before we release dq_list_lock
737 struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
739 unsigned int hashent = hashfn(sb, id, type);
740 struct dquot *dquot = NULL, *empty = NULL;
742 if (!sb_has_quota_active(sb, type))
745 spin_lock(&dq_list_lock);
746 spin_lock(&dq_state_lock);
747 if (!sb_has_quota_active(sb, type)) {
748 spin_unlock(&dq_state_lock);
749 spin_unlock(&dq_list_lock);
752 spin_unlock(&dq_state_lock);
754 dquot = find_dquot(hashent, sb, id, type);
757 spin_unlock(&dq_list_lock);
758 empty = get_empty_dquot(sb, type);
760 schedule(); /* Try to wait for a moment... */
766 /* all dquots go on the inuse_list */
768 /* hash it first so it can be found */
769 insert_dquot_hash(dquot);
771 spin_unlock(&dq_list_lock);
773 if (!atomic_read(&dquot->dq_count))
774 remove_free_dquot(dquot);
775 atomic_inc(&dquot->dq_count);
776 dqstats.cache_hits++;
778 spin_unlock(&dq_list_lock);
780 /* Wait for dq_lock - after this we know that either dquot_release() is
781 * already finished or it will be canceled due to dq_count > 1 test */
782 wait_on_dquot(dquot);
783 /* Read the dquot / allocate space in quota file */
784 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) &&
785 sb->dq_op->acquire_dquot(dquot) < 0) {
790 #ifdef __DQUOT_PARANOIA
791 BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
795 do_destroy_dquot(empty);
799 EXPORT_SYMBOL(dqget);
801 static int dqinit_needed(struct inode *inode, int type)
805 if (IS_NOQUOTA(inode))
808 return !inode->i_dquot[type];
809 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
810 if (!inode->i_dquot[cnt])
815 /* This routine is guarded by dqonoff_mutex mutex */
816 static void add_dquot_ref(struct super_block *sb, int type)
818 struct inode *inode, *old_inode = NULL;
820 spin_lock(&inode_lock);
821 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
822 if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE|I_NEW))
824 if (!atomic_read(&inode->i_writecount))
826 if (!dqinit_needed(inode, type))
830 spin_unlock(&inode_lock);
833 sb->dq_op->initialize(inode, type);
834 /* We hold a reference to 'inode' so it couldn't have been
835 * removed from s_inodes list while we dropped the inode_lock.
836 * We cannot iput the inode now as we can be holding the last
837 * reference and we cannot iput it under inode_lock. So we
838 * keep the reference and iput it later. */
840 spin_lock(&inode_lock);
842 spin_unlock(&inode_lock);
847 * Return 0 if dqput() won't block.
848 * (note that 1 doesn't necessarily mean blocking)
850 static inline int dqput_blocks(struct dquot *dquot)
852 if (atomic_read(&dquot->dq_count) <= 1)
858 * Remove references to dquots from inode and add dquot to list for freeing
859 * if we have the last referece to dquot
860 * We can't race with anybody because we hold dqptr_sem for writing...
862 static int remove_inode_dquot_ref(struct inode *inode, int type,
863 struct list_head *tofree_head)
865 struct dquot *dquot = inode->i_dquot[type];
867 inode->i_dquot[type] = NULL;
869 if (dqput_blocks(dquot)) {
870 #ifdef __DQUOT_PARANOIA
871 if (atomic_read(&dquot->dq_count) != 1)
872 printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count));
874 spin_lock(&dq_list_lock);
875 /* As dquot must have currently users it can't be on
876 * the free list... */
877 list_add(&dquot->dq_free, tofree_head);
878 spin_unlock(&dq_list_lock);
882 dqput(dquot); /* We have guaranteed we won't block */
888 * Free list of dquots
889 * Dquots are removed from inodes and no new references can be got so we are
890 * the only ones holding reference
892 static void put_dquot_list(struct list_head *tofree_head)
894 struct list_head *act_head;
897 act_head = tofree_head->next;
898 while (act_head != tofree_head) {
899 dquot = list_entry(act_head, struct dquot, dq_free);
900 act_head = act_head->next;
901 /* Remove dquot from the list so we won't have problems... */
902 list_del_init(&dquot->dq_free);
907 static void remove_dquot_ref(struct super_block *sb, int type,
908 struct list_head *tofree_head)
912 spin_lock(&inode_lock);
913 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
915 * We have to scan also I_NEW inodes because they can already
916 * have quota pointer initialized. Luckily, we need to touch
917 * only quota pointers and these have separate locking
920 if (!IS_NOQUOTA(inode))
921 remove_inode_dquot_ref(inode, type, tofree_head);
923 spin_unlock(&inode_lock);
926 /* Gather all references from inodes and drop them */
927 static void drop_dquot_ref(struct super_block *sb, int type)
929 LIST_HEAD(tofree_head);
932 down_write(&sb_dqopt(sb)->dqptr_sem);
933 remove_dquot_ref(sb, type, &tofree_head);
934 up_write(&sb_dqopt(sb)->dqptr_sem);
935 put_dquot_list(&tofree_head);
939 static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
941 dquot->dq_dqb.dqb_curinodes += number;
944 static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
946 dquot->dq_dqb.dqb_curspace += number;
949 static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
951 dquot->dq_dqb.dqb_rsvspace += number;
955 * Claim reserved quota space
957 static void dquot_claim_reserved_space(struct dquot *dquot,
960 WARN_ON(dquot->dq_dqb.dqb_rsvspace < number);
961 dquot->dq_dqb.dqb_curspace += number;
962 dquot->dq_dqb.dqb_rsvspace -= number;
966 void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
968 dquot->dq_dqb.dqb_rsvspace -= number;
971 static void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
973 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
974 dquot->dq_dqb.dqb_curinodes >= number)
975 dquot->dq_dqb.dqb_curinodes -= number;
977 dquot->dq_dqb.dqb_curinodes = 0;
978 if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
979 dquot->dq_dqb.dqb_itime = (time_t) 0;
980 clear_bit(DQ_INODES_B, &dquot->dq_flags);
983 static void dquot_decr_space(struct dquot *dquot, qsize_t number)
985 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
986 dquot->dq_dqb.dqb_curspace >= number)
987 dquot->dq_dqb.dqb_curspace -= number;
989 dquot->dq_dqb.dqb_curspace = 0;
990 if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
991 dquot->dq_dqb.dqb_btime = (time_t) 0;
992 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
995 static int warning_issued(struct dquot *dquot, const int warntype)
997 int flag = (warntype == QUOTA_NL_BHARDWARN ||
998 warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
999 ((warntype == QUOTA_NL_IHARDWARN ||
1000 warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
1004 return test_and_set_bit(flag, &dquot->dq_flags);
1007 #ifdef CONFIG_PRINT_QUOTA_WARNING
1008 static int flag_print_warnings = 1;
1010 static int need_print_warning(struct dquot *dquot)
1012 if (!flag_print_warnings)
1015 switch (dquot->dq_type) {
1017 return current_fsuid() == dquot->dq_id;
1019 return in_group_p(dquot->dq_id);
1024 /* Print warning to user which exceeded quota */
1025 static void print_warning(struct dquot *dquot, const int warntype)
1028 struct tty_struct *tty;
1030 if (warntype == QUOTA_NL_IHARDBELOW ||
1031 warntype == QUOTA_NL_ISOFTBELOW ||
1032 warntype == QUOTA_NL_BHARDBELOW ||
1033 warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot))
1036 tty = get_current_tty();
1039 tty_write_message(tty, dquot->dq_sb->s_id);
1040 if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
1041 tty_write_message(tty, ": warning, ");
1043 tty_write_message(tty, ": write failed, ");
1044 tty_write_message(tty, quotatypes[dquot->dq_type]);
1046 case QUOTA_NL_IHARDWARN:
1047 msg = " file limit reached.\r\n";
1049 case QUOTA_NL_ISOFTLONGWARN:
1050 msg = " file quota exceeded too long.\r\n";
1052 case QUOTA_NL_ISOFTWARN:
1053 msg = " file quota exceeded.\r\n";
1055 case QUOTA_NL_BHARDWARN:
1056 msg = " block limit reached.\r\n";
1058 case QUOTA_NL_BSOFTLONGWARN:
1059 msg = " block quota exceeded too long.\r\n";
1061 case QUOTA_NL_BSOFTWARN:
1062 msg = " block quota exceeded.\r\n";
1065 tty_write_message(tty, msg);
1071 * Write warnings to the console and send warning messages over netlink.
1073 * Note that this function can sleep.
1075 static void flush_warnings(struct dquot *const *dquots, char *warntype)
1080 for (i = 0; i < MAXQUOTAS; i++) {
1082 if (dq && warntype[i] != QUOTA_NL_NOWARN &&
1083 !warning_issued(dq, warntype[i])) {
1084 #ifdef CONFIG_PRINT_QUOTA_WARNING
1085 print_warning(dq, warntype[i]);
1087 quota_send_warning(dq->dq_type, dq->dq_id,
1088 dq->dq_sb->s_dev, warntype[i]);
1093 static int ignore_hardlimit(struct dquot *dquot)
1095 struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
1097 return capable(CAP_SYS_RESOURCE) &&
1098 (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD ||
1099 !(info->dqi_flags & V1_DQF_RSQUASH));
1102 /* needs dq_data_lock */
1103 static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype)
1105 qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes;
1107 *warntype = QUOTA_NL_NOWARN;
1108 if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
1109 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1112 if (dquot->dq_dqb.dqb_ihardlimit &&
1113 newinodes > dquot->dq_dqb.dqb_ihardlimit &&
1114 !ignore_hardlimit(dquot)) {
1115 *warntype = QUOTA_NL_IHARDWARN;
1119 if (dquot->dq_dqb.dqb_isoftlimit &&
1120 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1121 dquot->dq_dqb.dqb_itime &&
1122 get_seconds() >= dquot->dq_dqb.dqb_itime &&
1123 !ignore_hardlimit(dquot)) {
1124 *warntype = QUOTA_NL_ISOFTLONGWARN;
1128 if (dquot->dq_dqb.dqb_isoftlimit &&
1129 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1130 dquot->dq_dqb.dqb_itime == 0) {
1131 *warntype = QUOTA_NL_ISOFTWARN;
1132 dquot->dq_dqb.dqb_itime = get_seconds() +
1133 sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
1139 /* needs dq_data_lock */
1140 static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype)
1143 struct super_block *sb = dquot->dq_sb;
1145 *warntype = QUOTA_NL_NOWARN;
1146 if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) ||
1147 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1150 tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace
1153 if (dquot->dq_dqb.dqb_bhardlimit &&
1154 tspace > dquot->dq_dqb.dqb_bhardlimit &&
1155 !ignore_hardlimit(dquot)) {
1157 *warntype = QUOTA_NL_BHARDWARN;
1161 if (dquot->dq_dqb.dqb_bsoftlimit &&
1162 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
1163 dquot->dq_dqb.dqb_btime &&
1164 get_seconds() >= dquot->dq_dqb.dqb_btime &&
1165 !ignore_hardlimit(dquot)) {
1167 *warntype = QUOTA_NL_BSOFTLONGWARN;
1171 if (dquot->dq_dqb.dqb_bsoftlimit &&
1172 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
1173 dquot->dq_dqb.dqb_btime == 0) {
1175 *warntype = QUOTA_NL_BSOFTWARN;
1176 dquot->dq_dqb.dqb_btime = get_seconds() +
1177 sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace;
1181 * We don't allow preallocation to exceed softlimit so exceeding will
1190 static int info_idq_free(struct dquot *dquot, qsize_t inodes)
1194 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1195 dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit ||
1196 !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type))
1197 return QUOTA_NL_NOWARN;
1199 newinodes = dquot->dq_dqb.dqb_curinodes - inodes;
1200 if (newinodes <= dquot->dq_dqb.dqb_isoftlimit)
1201 return QUOTA_NL_ISOFTBELOW;
1202 if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
1203 newinodes < dquot->dq_dqb.dqb_ihardlimit)
1204 return QUOTA_NL_IHARDBELOW;
1205 return QUOTA_NL_NOWARN;
1208 static int info_bdq_free(struct dquot *dquot, qsize_t space)
1210 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1211 dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
1212 return QUOTA_NL_NOWARN;
1214 if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit)
1215 return QUOTA_NL_BSOFTBELOW;
1216 if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit &&
1217 dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit)
1218 return QUOTA_NL_BHARDBELOW;
1219 return QUOTA_NL_NOWARN;
1222 * Initialize quota pointers in inode
1223 * We do things in a bit complicated way but by that we avoid calling
1224 * dqget() and thus filesystem callbacks under dqptr_sem.
1226 int dquot_initialize(struct inode *inode, int type)
1228 unsigned int id = 0;
1230 struct dquot *got[MAXQUOTAS] = { NULL, NULL };
1231 struct super_block *sb = inode->i_sb;
1233 /* First test before acquiring mutex - solves deadlocks when we
1234 * re-enter the quota code and are already holding the mutex */
1235 if (IS_NOQUOTA(inode))
1238 /* First get references to structures we might need. */
1239 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1240 if (type != -1 && cnt != type)
1250 got[cnt] = dqget(sb, id, cnt);
1253 down_write(&sb_dqopt(sb)->dqptr_sem);
1254 /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
1255 if (IS_NOQUOTA(inode))
1257 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1258 if (type != -1 && cnt != type)
1260 /* Avoid races with quotaoff() */
1261 if (!sb_has_quota_active(sb, cnt))
1263 if (!inode->i_dquot[cnt]) {
1264 inode->i_dquot[cnt] = got[cnt];
1269 up_write(&sb_dqopt(sb)->dqptr_sem);
1270 /* Drop unused references */
1271 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1275 EXPORT_SYMBOL(dquot_initialize);
1278 * Release all quotas referenced by inode
1280 int dquot_drop(struct inode *inode)
1283 struct dquot *put[MAXQUOTAS];
1285 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1286 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1287 put[cnt] = inode->i_dquot[cnt];
1288 inode->i_dquot[cnt] = NULL;
1290 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1292 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1296 EXPORT_SYMBOL(dquot_drop);
1298 /* Wrapper to remove references to quota structures from inode */
1299 void vfs_dq_drop(struct inode *inode)
1301 /* Here we can get arbitrary inode from clear_inode() so we have
1302 * to be careful. OTOH we don't need locking as quota operations
1303 * are allowed to change only at mount time */
1304 if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op
1305 && inode->i_sb->dq_op->drop) {
1307 /* Test before calling to rule out calls from proc and such
1308 * where we are not allowed to block. Note that this is
1309 * actually reliable test even without the lock - the caller
1310 * must assure that nobody can come after the DQUOT_DROP and
1311 * add quota pointers back anyway */
1312 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1313 if (inode->i_dquot[cnt])
1315 if (cnt < MAXQUOTAS)
1316 inode->i_sb->dq_op->drop(inode);
1319 EXPORT_SYMBOL(vfs_dq_drop);
1322 * inode_reserved_space is managed internally by quota, and protected by
1323 * i_lock similar to i_blocks+i_bytes.
1325 static qsize_t *inode_reserved_space(struct inode * inode)
1327 /* Filesystem must explicitly define it's own method in order to use
1328 * quota reservation interface */
1329 BUG_ON(!inode->i_sb->dq_op->get_reserved_space);
1330 return inode->i_sb->dq_op->get_reserved_space(inode);
1333 static void inode_add_rsv_space(struct inode *inode, qsize_t number)
1335 spin_lock(&inode->i_lock);
1336 *inode_reserved_space(inode) += number;
1337 spin_unlock(&inode->i_lock);
1341 static void inode_claim_rsv_space(struct inode *inode, qsize_t number)
1343 spin_lock(&inode->i_lock);
1344 *inode_reserved_space(inode) -= number;
1345 __inode_add_bytes(inode, number);
1346 spin_unlock(&inode->i_lock);
1349 static void inode_sub_rsv_space(struct inode *inode, qsize_t number)
1351 spin_lock(&inode->i_lock);
1352 *inode_reserved_space(inode) -= number;
1353 spin_unlock(&inode->i_lock);
1356 static qsize_t inode_get_rsv_space(struct inode *inode)
1359 spin_lock(&inode->i_lock);
1360 ret = *inode_reserved_space(inode);
1361 spin_unlock(&inode->i_lock);
1365 static void inode_incr_space(struct inode *inode, qsize_t number,
1369 inode_add_rsv_space(inode, number);
1371 inode_add_bytes(inode, number);
1374 static void inode_decr_space(struct inode *inode, qsize_t number, int reserve)
1377 inode_sub_rsv_space(inode, number);
1379 inode_sub_bytes(inode, number);
1383 * Following four functions update i_blocks+i_bytes fields and
1384 * quota information (together with appropriate checks)
1385 * NOTE: We absolutely rely on the fact that caller dirties
1386 * the inode (usually macros in quotaops.h care about this) and
1387 * holds a handle for the current transaction so that dquot write and
1388 * inode write go into the same transaction.
1392 * This operation can block, but only after everything is updated
1394 int __dquot_alloc_space(struct inode *inode, qsize_t number,
1395 int warn, int reserve)
1397 int cnt, ret = QUOTA_OK;
1398 char warntype[MAXQUOTAS];
1401 * First test before acquiring mutex - solves deadlocks when we
1402 * re-enter the quota code and are already holding the mutex
1404 if (IS_NOQUOTA(inode)) {
1405 inode_incr_space(inode, number, reserve);
1409 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1410 if (IS_NOQUOTA(inode)) {
1411 inode_incr_space(inode, number, reserve);
1415 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1416 warntype[cnt] = QUOTA_NL_NOWARN;
1418 spin_lock(&dq_data_lock);
1419 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1420 if (!inode->i_dquot[cnt])
1422 if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt)
1425 spin_unlock(&dq_data_lock);
1426 goto out_flush_warn;
1429 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1430 if (!inode->i_dquot[cnt])
1433 dquot_resv_space(inode->i_dquot[cnt], number);
1435 dquot_incr_space(inode->i_dquot[cnt], number);
1437 inode_incr_space(inode, number, reserve);
1438 spin_unlock(&dq_data_lock);
1441 goto out_flush_warn;
1442 /* Dirtify all the dquots - this can block when journalling */
1443 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1444 if (inode->i_dquot[cnt])
1445 mark_dquot_dirty(inode->i_dquot[cnt]);
1447 flush_warnings(inode->i_dquot, warntype);
1449 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1454 int dquot_alloc_space(struct inode *inode, qsize_t number, int warn)
1456 return __dquot_alloc_space(inode, number, warn, 0);
1458 EXPORT_SYMBOL(dquot_alloc_space);
1460 int dquot_reserve_space(struct inode *inode, qsize_t number, int warn)
1462 return __dquot_alloc_space(inode, number, warn, 1);
1464 EXPORT_SYMBOL(dquot_reserve_space);
1467 * This operation can block, but only after everything is updated
1469 int dquot_alloc_inode(const struct inode *inode, qsize_t number)
1471 int cnt, ret = NO_QUOTA;
1472 char warntype[MAXQUOTAS];
1474 /* First test before acquiring mutex - solves deadlocks when we
1475 * re-enter the quota code and are already holding the mutex */
1476 if (IS_NOQUOTA(inode))
1478 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1479 warntype[cnt] = QUOTA_NL_NOWARN;
1480 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1481 if (IS_NOQUOTA(inode)) {
1482 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1485 spin_lock(&dq_data_lock);
1486 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1487 if (!inode->i_dquot[cnt])
1489 if (check_idq(inode->i_dquot[cnt], number, warntype+cnt)
1494 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1495 if (!inode->i_dquot[cnt])
1497 dquot_incr_inodes(inode->i_dquot[cnt], number);
1501 spin_unlock(&dq_data_lock);
1502 if (ret == QUOTA_OK)
1503 /* Dirtify all the dquots - this can block when journalling */
1504 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1505 if (inode->i_dquot[cnt])
1506 mark_dquot_dirty(inode->i_dquot[cnt]);
1507 flush_warnings(inode->i_dquot, warntype);
1508 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1511 EXPORT_SYMBOL(dquot_alloc_inode);
1513 int dquot_claim_space(struct inode *inode, qsize_t number)
1518 if (IS_NOQUOTA(inode)) {
1519 inode_claim_rsv_space(inode, number);
1523 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1524 if (IS_NOQUOTA(inode)) {
1525 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1526 inode_claim_rsv_space(inode, number);
1530 spin_lock(&dq_data_lock);
1531 /* Claim reserved quotas to allocated quotas */
1532 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1533 if (inode->i_dquot[cnt])
1534 dquot_claim_reserved_space(inode->i_dquot[cnt],
1537 /* Update inode bytes */
1538 inode_claim_rsv_space(inode, number);
1539 spin_unlock(&dq_data_lock);
1540 /* Dirtify all the dquots - this can block when journalling */
1541 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1542 if (inode->i_dquot[cnt])
1543 mark_dquot_dirty(inode->i_dquot[cnt]);
1544 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1548 EXPORT_SYMBOL(dquot_claim_space);
1551 * This operation can block, but only after everything is updated
1553 int __dquot_free_space(struct inode *inode, qsize_t number, int reserve)
1556 char warntype[MAXQUOTAS];
1558 /* First test before acquiring mutex - solves deadlocks when we
1559 * re-enter the quota code and are already holding the mutex */
1560 if (IS_NOQUOTA(inode)) {
1562 inode_decr_space(inode, number, reserve);
1566 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1567 /* Now recheck reliably when holding dqptr_sem */
1568 if (IS_NOQUOTA(inode)) {
1569 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1572 spin_lock(&dq_data_lock);
1573 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1574 if (!inode->i_dquot[cnt])
1576 warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number);
1578 dquot_free_reserved_space(inode->i_dquot[cnt], number);
1580 dquot_decr_space(inode->i_dquot[cnt], number);
1582 inode_decr_space(inode, number, reserve);
1583 spin_unlock(&dq_data_lock);
1587 /* Dirtify all the dquots - this can block when journalling */
1588 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1589 if (inode->i_dquot[cnt])
1590 mark_dquot_dirty(inode->i_dquot[cnt]);
1592 flush_warnings(inode->i_dquot, warntype);
1593 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1597 int dquot_free_space(struct inode *inode, qsize_t number)
1599 return __dquot_free_space(inode, number, 0);
1601 EXPORT_SYMBOL(dquot_free_space);
1604 * Release reserved quota space
1606 void dquot_release_reserved_space(struct inode *inode, qsize_t number)
1608 __dquot_free_space(inode, number, 1);
1611 EXPORT_SYMBOL(dquot_release_reserved_space);
1614 * This operation can block, but only after everything is updated
1616 int dquot_free_inode(const struct inode *inode, qsize_t number)
1619 char warntype[MAXQUOTAS];
1621 /* First test before acquiring mutex - solves deadlocks when we
1622 * re-enter the quota code and are already holding the mutex */
1623 if (IS_NOQUOTA(inode))
1626 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1627 /* Now recheck reliably when holding dqptr_sem */
1628 if (IS_NOQUOTA(inode)) {
1629 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1632 spin_lock(&dq_data_lock);
1633 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1634 if (!inode->i_dquot[cnt])
1636 warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number);
1637 dquot_decr_inodes(inode->i_dquot[cnt], number);
1639 spin_unlock(&dq_data_lock);
1640 /* Dirtify all the dquots - this can block when journalling */
1641 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1642 if (inode->i_dquot[cnt])
1643 mark_dquot_dirty(inode->i_dquot[cnt]);
1644 flush_warnings(inode->i_dquot, warntype);
1645 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1648 EXPORT_SYMBOL(dquot_free_inode);
1651 * Transfer the number of inode and blocks from one diskquota to an other.
1653 * This operation can block, but only after everything is updated
1654 * A transaction must be started when entering this function.
1656 int dquot_transfer(struct inode *inode, struct iattr *iattr)
1658 qsize_t space, cur_space;
1659 qsize_t rsv_space = 0;
1660 struct dquot *transfer_from[MAXQUOTAS];
1661 struct dquot *transfer_to[MAXQUOTAS];
1662 int cnt, ret = QUOTA_OK;
1663 int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid,
1664 chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid;
1665 char warntype_to[MAXQUOTAS];
1666 char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS];
1668 /* First test before acquiring mutex - solves deadlocks when we
1669 * re-enter the quota code and are already holding the mutex */
1670 if (IS_NOQUOTA(inode))
1672 /* Initialize the arrays */
1673 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1674 transfer_from[cnt] = NULL;
1675 transfer_to[cnt] = NULL;
1676 warntype_to[cnt] = QUOTA_NL_NOWARN;
1679 transfer_to[USRQUOTA] = dqget(inode->i_sb, iattr->ia_uid,
1682 transfer_to[GRPQUOTA] = dqget(inode->i_sb, iattr->ia_gid,
1685 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1686 /* Now recheck reliably when holding dqptr_sem */
1687 if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
1688 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1691 spin_lock(&dq_data_lock);
1692 cur_space = inode_get_bytes(inode);
1693 rsv_space = inode_get_rsv_space(inode);
1694 space = cur_space + rsv_space;
1695 /* Build the transfer_from list and check the limits */
1696 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1697 if (!transfer_to[cnt])
1699 transfer_from[cnt] = inode->i_dquot[cnt];
1700 if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) ==
1701 NO_QUOTA || check_bdq(transfer_to[cnt], space, 0,
1702 warntype_to + cnt) == NO_QUOTA)
1707 * Finally perform the needed transfer from transfer_from to transfer_to
1709 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1711 * Skip changes for same uid or gid or for turned off quota-type.
1713 if (!transfer_to[cnt])
1716 /* Due to IO error we might not have transfer_from[] structure */
1717 if (transfer_from[cnt]) {
1718 warntype_from_inodes[cnt] =
1719 info_idq_free(transfer_from[cnt], 1);
1720 warntype_from_space[cnt] =
1721 info_bdq_free(transfer_from[cnt], space);
1722 dquot_decr_inodes(transfer_from[cnt], 1);
1723 dquot_decr_space(transfer_from[cnt], cur_space);
1724 dquot_free_reserved_space(transfer_from[cnt],
1728 dquot_incr_inodes(transfer_to[cnt], 1);
1729 dquot_incr_space(transfer_to[cnt], cur_space);
1730 dquot_resv_space(transfer_to[cnt], rsv_space);
1732 inode->i_dquot[cnt] = transfer_to[cnt];
1734 spin_unlock(&dq_data_lock);
1735 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1737 /* Dirtify all the dquots - this can block when journalling */
1738 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1739 if (transfer_from[cnt])
1740 mark_dquot_dirty(transfer_from[cnt]);
1741 if (transfer_to[cnt]) {
1742 mark_dquot_dirty(transfer_to[cnt]);
1743 /* The reference we got is transferred to the inode */
1744 transfer_to[cnt] = NULL;
1748 flush_warnings(transfer_to, warntype_to);
1749 flush_warnings(transfer_from, warntype_from_inodes);
1750 flush_warnings(transfer_from, warntype_from_space);
1752 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1753 dqput(transfer_from[cnt]);
1754 dqput(transfer_to[cnt]);
1758 spin_unlock(&dq_data_lock);
1759 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1760 /* Clear dquot pointers we don't want to dqput() */
1761 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1762 transfer_from[cnt] = NULL;
1766 EXPORT_SYMBOL(dquot_transfer);
1768 /* Wrapper for transferring ownership of an inode */
1769 int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
1771 if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) {
1773 if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA)
1778 EXPORT_SYMBOL(vfs_dq_transfer);
1781 * Write info of quota file to disk
1783 int dquot_commit_info(struct super_block *sb, int type)
1786 struct quota_info *dqopt = sb_dqopt(sb);
1788 mutex_lock(&dqopt->dqio_mutex);
1789 ret = dqopt->ops[type]->write_file_info(sb, type);
1790 mutex_unlock(&dqopt->dqio_mutex);
1793 EXPORT_SYMBOL(dquot_commit_info);
1796 * Definitions of diskquota operations.
1798 const struct dquot_operations dquot_operations = {
1799 .initialize = dquot_initialize,
1801 .alloc_space = dquot_alloc_space,
1802 .alloc_inode = dquot_alloc_inode,
1803 .free_space = dquot_free_space,
1804 .free_inode = dquot_free_inode,
1805 .transfer = dquot_transfer,
1806 .write_dquot = dquot_commit,
1807 .acquire_dquot = dquot_acquire,
1808 .release_dquot = dquot_release,
1809 .mark_dirty = dquot_mark_dquot_dirty,
1810 .write_info = dquot_commit_info,
1811 .alloc_dquot = dquot_alloc,
1812 .destroy_dquot = dquot_destroy,
1816 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1818 int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags)
1821 struct quota_info *dqopt = sb_dqopt(sb);
1822 struct inode *toputinode[MAXQUOTAS];
1824 /* Cannot turn off usage accounting without turning off limits, or
1825 * suspend quotas and simultaneously turn quotas off. */
1826 if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED))
1827 || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED |
1828 DQUOT_USAGE_ENABLED)))
1831 /* We need to serialize quota_off() for device */
1832 mutex_lock(&dqopt->dqonoff_mutex);
1835 * Skip everything if there's nothing to do. We have to do this because
1836 * sometimes we are called when fill_super() failed and calling
1837 * sync_fs() in such cases does no good.
1839 if (!sb_any_quota_loaded(sb)) {
1840 mutex_unlock(&dqopt->dqonoff_mutex);
1843 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1844 toputinode[cnt] = NULL;
1845 if (type != -1 && cnt != type)
1847 if (!sb_has_quota_loaded(sb, cnt))
1850 if (flags & DQUOT_SUSPENDED) {
1851 spin_lock(&dq_state_lock);
1853 dquot_state_flag(DQUOT_SUSPENDED, cnt);
1854 spin_unlock(&dq_state_lock);
1856 spin_lock(&dq_state_lock);
1857 dqopt->flags &= ~dquot_state_flag(flags, cnt);
1858 /* Turning off suspended quotas? */
1859 if (!sb_has_quota_loaded(sb, cnt) &&
1860 sb_has_quota_suspended(sb, cnt)) {
1861 dqopt->flags &= ~dquot_state_flag(
1862 DQUOT_SUSPENDED, cnt);
1863 spin_unlock(&dq_state_lock);
1864 iput(dqopt->files[cnt]);
1865 dqopt->files[cnt] = NULL;
1868 spin_unlock(&dq_state_lock);
1871 /* We still have to keep quota loaded? */
1872 if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED))
1875 /* Note: these are blocking operations */
1876 drop_dquot_ref(sb, cnt);
1877 invalidate_dquots(sb, cnt);
1879 * Now all dquots should be invalidated, all writes done so we
1880 * should be only users of the info. No locks needed.
1882 if (info_dirty(&dqopt->info[cnt]))
1883 sb->dq_op->write_info(sb, cnt);
1884 if (dqopt->ops[cnt]->free_file_info)
1885 dqopt->ops[cnt]->free_file_info(sb, cnt);
1886 put_quota_format(dqopt->info[cnt].dqi_format);
1888 toputinode[cnt] = dqopt->files[cnt];
1889 if (!sb_has_quota_loaded(sb, cnt))
1890 dqopt->files[cnt] = NULL;
1891 dqopt->info[cnt].dqi_flags = 0;
1892 dqopt->info[cnt].dqi_igrace = 0;
1893 dqopt->info[cnt].dqi_bgrace = 0;
1894 dqopt->ops[cnt] = NULL;
1896 mutex_unlock(&dqopt->dqonoff_mutex);
1898 /* Skip syncing and setting flags if quota files are hidden */
1899 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
1902 /* Sync the superblock so that buffers with quota data are written to
1903 * disk (and so userspace sees correct data afterwards). */
1904 if (sb->s_op->sync_fs)
1905 sb->s_op->sync_fs(sb, 1);
1906 sync_blockdev(sb->s_bdev);
1907 /* Now the quota files are just ordinary files and we can set the
1908 * inode flags back. Moreover we discard the pagecache so that
1909 * userspace sees the writes we did bypassing the pagecache. We
1910 * must also discard the blockdev buffers so that we see the
1911 * changes done by userspace on the next quotaon() */
1912 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1913 if (toputinode[cnt]) {
1914 mutex_lock(&dqopt->dqonoff_mutex);
1915 /* If quota was reenabled in the meantime, we have
1917 if (!sb_has_quota_loaded(sb, cnt)) {
1918 mutex_lock_nested(&toputinode[cnt]->i_mutex,
1920 toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
1921 S_NOATIME | S_NOQUOTA);
1922 truncate_inode_pages(&toputinode[cnt]->i_data,
1924 mutex_unlock(&toputinode[cnt]->i_mutex);
1925 mark_inode_dirty(toputinode[cnt]);
1927 mutex_unlock(&dqopt->dqonoff_mutex);
1930 invalidate_bdev(sb->s_bdev);
1932 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1933 if (toputinode[cnt]) {
1934 /* On remount RO, we keep the inode pointer so that we
1935 * can reenable quota on the subsequent remount RW. We
1936 * have to check 'flags' variable and not use sb_has_
1937 * function because another quotaon / quotaoff could
1938 * change global state before we got here. We refuse
1939 * to suspend quotas when there is pending delete on
1940 * the quota file... */
1941 if (!(flags & DQUOT_SUSPENDED))
1942 iput(toputinode[cnt]);
1943 else if (!toputinode[cnt]->i_nlink)
1948 EXPORT_SYMBOL(vfs_quota_disable);
1950 int vfs_quota_off(struct super_block *sb, int type, int remount)
1952 return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED :
1953 (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED));
1955 EXPORT_SYMBOL(vfs_quota_off);
1957 * Turn quotas on on a device
1961 * Helper function to turn quotas on when we already have the inode of
1962 * quota file and no quota information is loaded.
1964 static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
1967 struct quota_format_type *fmt = find_quota_format(format_id);
1968 struct super_block *sb = inode->i_sb;
1969 struct quota_info *dqopt = sb_dqopt(sb);
1975 if (!S_ISREG(inode->i_mode)) {
1979 if (IS_RDONLY(inode)) {
1983 if (!sb->s_op->quota_write || !sb->s_op->quota_read) {
1987 /* Usage always has to be set... */
1988 if (!(flags & DQUOT_USAGE_ENABLED)) {
1993 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
1994 /* As we bypass the pagecache we must now flush the inode so
1995 * that we see all the changes from userspace... */
1996 write_inode_now(inode, 1);
1997 /* And now flush the block cache so that kernel sees the
1999 invalidate_bdev(sb->s_bdev);
2001 mutex_lock(&dqopt->dqonoff_mutex);
2002 if (sb_has_quota_loaded(sb, type)) {
2007 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2008 /* We don't want quota and atime on quota files (deadlocks
2009 * possible) Also nobody should write to the file - we use
2010 * special IO operations which ignore the immutable bit. */
2011 down_write(&dqopt->dqptr_sem);
2012 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2013 oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE |
2015 inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
2016 mutex_unlock(&inode->i_mutex);
2017 up_write(&dqopt->dqptr_sem);
2018 sb->dq_op->drop(inode);
2022 dqopt->files[type] = igrab(inode);
2023 if (!dqopt->files[type])
2026 if (!fmt->qf_ops->check_quota_file(sb, type))
2029 dqopt->ops[type] = fmt->qf_ops;
2030 dqopt->info[type].dqi_format = fmt;
2031 dqopt->info[type].dqi_fmt_id = format_id;
2032 INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
2033 mutex_lock(&dqopt->dqio_mutex);
2034 error = dqopt->ops[type]->read_file_info(sb, type);
2036 mutex_unlock(&dqopt->dqio_mutex);
2039 mutex_unlock(&dqopt->dqio_mutex);
2040 spin_lock(&dq_state_lock);
2041 dqopt->flags |= dquot_state_flag(flags, type);
2042 spin_unlock(&dq_state_lock);
2044 add_dquot_ref(sb, type);
2045 mutex_unlock(&dqopt->dqonoff_mutex);
2050 dqopt->files[type] = NULL;
2053 if (oldflags != -1) {
2054 down_write(&dqopt->dqptr_sem);
2055 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2056 /* Set the flags back (in the case of accidental quotaon()
2057 * on a wrong file we don't want to mess up the flags) */
2058 inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
2059 inode->i_flags |= oldflags;
2060 mutex_unlock(&inode->i_mutex);
2061 up_write(&dqopt->dqptr_sem);
2063 mutex_unlock(&dqopt->dqonoff_mutex);
2065 put_quota_format(fmt);
2070 /* Reenable quotas on remount RW */
2071 static int vfs_quota_on_remount(struct super_block *sb, int type)
2073 struct quota_info *dqopt = sb_dqopt(sb);
2074 struct inode *inode;
2078 mutex_lock(&dqopt->dqonoff_mutex);
2079 if (!sb_has_quota_suspended(sb, type)) {
2080 mutex_unlock(&dqopt->dqonoff_mutex);
2083 inode = dqopt->files[type];
2084 dqopt->files[type] = NULL;
2085 spin_lock(&dq_state_lock);
2086 flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
2087 DQUOT_LIMITS_ENABLED, type);
2088 dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type);
2089 spin_unlock(&dq_state_lock);
2090 mutex_unlock(&dqopt->dqonoff_mutex);
2092 flags = dquot_generic_flag(flags, type);
2093 ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id,
2100 int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
2103 int error = security_quota_on(path->dentry);
2106 /* Quota file not on the same filesystem? */
2107 if (path->mnt->mnt_sb != sb)
2110 error = vfs_load_quota_inode(path->dentry->d_inode, type,
2111 format_id, DQUOT_USAGE_ENABLED |
2112 DQUOT_LIMITS_ENABLED);
2115 EXPORT_SYMBOL(vfs_quota_on_path);
2117 int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name,
2124 return vfs_quota_on_remount(sb, type);
2126 error = kern_path(name, LOOKUP_FOLLOW, &path);
2128 error = vfs_quota_on_path(sb, type, format_id, &path);
2133 EXPORT_SYMBOL(vfs_quota_on);
2136 * More powerful function for turning on quotas allowing setting
2137 * of individual quota flags
2139 int vfs_quota_enable(struct inode *inode, int type, int format_id,
2143 struct super_block *sb = inode->i_sb;
2144 struct quota_info *dqopt = sb_dqopt(sb);
2146 /* Just unsuspend quotas? */
2147 if (flags & DQUOT_SUSPENDED)
2148 return vfs_quota_on_remount(sb, type);
2151 /* Just updating flags needed? */
2152 if (sb_has_quota_loaded(sb, type)) {
2153 mutex_lock(&dqopt->dqonoff_mutex);
2154 /* Now do a reliable test... */
2155 if (!sb_has_quota_loaded(sb, type)) {
2156 mutex_unlock(&dqopt->dqonoff_mutex);
2159 if (flags & DQUOT_USAGE_ENABLED &&
2160 sb_has_quota_usage_enabled(sb, type)) {
2164 if (flags & DQUOT_LIMITS_ENABLED &&
2165 sb_has_quota_limits_enabled(sb, type)) {
2169 spin_lock(&dq_state_lock);
2170 sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
2171 spin_unlock(&dq_state_lock);
2173 mutex_unlock(&dqopt->dqonoff_mutex);
2178 return vfs_load_quota_inode(inode, type, format_id, flags);
2180 EXPORT_SYMBOL(vfs_quota_enable);
2183 * This function is used when filesystem needs to initialize quotas
2184 * during mount time.
2186 int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
2187 int format_id, int type)
2189 struct dentry *dentry;
2192 mutex_lock(&sb->s_root->d_inode->i_mutex);
2193 dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
2194 mutex_unlock(&sb->s_root->d_inode->i_mutex);
2196 return PTR_ERR(dentry);
2198 if (!dentry->d_inode) {
2203 error = security_quota_on(dentry);
2205 error = vfs_load_quota_inode(dentry->d_inode, type, format_id,
2206 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
2212 EXPORT_SYMBOL(vfs_quota_on_mount);
2214 /* Wrapper to turn on quotas when remounting rw */
2215 int vfs_dq_quota_on_remount(struct super_block *sb)
2220 if (!sb->s_qcop || !sb->s_qcop->quota_on)
2222 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
2223 err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1);
2224 if (err < 0 && !ret)
2229 EXPORT_SYMBOL(vfs_dq_quota_on_remount);
2231 static inline qsize_t qbtos(qsize_t blocks)
2233 return blocks << QIF_DQBLKSIZE_BITS;
2236 static inline qsize_t stoqb(qsize_t space)
2238 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
2241 /* Generic routine for getting common part of quota structure */
2242 static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di)
2244 struct mem_dqblk *dm = &dquot->dq_dqb;
2246 spin_lock(&dq_data_lock);
2247 di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit);
2248 di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit);
2249 di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace;
2250 di->dqb_ihardlimit = dm->dqb_ihardlimit;
2251 di->dqb_isoftlimit = dm->dqb_isoftlimit;
2252 di->dqb_curinodes = dm->dqb_curinodes;
2253 di->dqb_btime = dm->dqb_btime;
2254 di->dqb_itime = dm->dqb_itime;
2255 di->dqb_valid = QIF_ALL;
2256 spin_unlock(&dq_data_lock);
2259 int vfs_get_dqblk(struct super_block *sb, int type, qid_t id,
2260 struct if_dqblk *di)
2262 struct dquot *dquot;
2264 dquot = dqget(sb, id, type);
2267 do_get_dqblk(dquot, di);
2272 EXPORT_SYMBOL(vfs_get_dqblk);
2274 /* Generic routine for setting common part of quota structure */
2275 static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
2277 struct mem_dqblk *dm = &dquot->dq_dqb;
2278 int check_blim = 0, check_ilim = 0;
2279 struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
2281 if ((di->dqb_valid & QIF_BLIMITS &&
2282 (di->dqb_bhardlimit > dqi->dqi_maxblimit ||
2283 di->dqb_bsoftlimit > dqi->dqi_maxblimit)) ||
2284 (di->dqb_valid & QIF_ILIMITS &&
2285 (di->dqb_ihardlimit > dqi->dqi_maxilimit ||
2286 di->dqb_isoftlimit > dqi->dqi_maxilimit)))
2289 spin_lock(&dq_data_lock);
2290 if (di->dqb_valid & QIF_SPACE) {
2291 dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace;
2293 __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
2295 if (di->dqb_valid & QIF_BLIMITS) {
2296 dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit);
2297 dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit);
2299 __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
2301 if (di->dqb_valid & QIF_INODES) {
2302 dm->dqb_curinodes = di->dqb_curinodes;
2304 __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
2306 if (di->dqb_valid & QIF_ILIMITS) {
2307 dm->dqb_isoftlimit = di->dqb_isoftlimit;
2308 dm->dqb_ihardlimit = di->dqb_ihardlimit;
2310 __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
2312 if (di->dqb_valid & QIF_BTIME) {
2313 dm->dqb_btime = di->dqb_btime;
2315 __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
2317 if (di->dqb_valid & QIF_ITIME) {
2318 dm->dqb_itime = di->dqb_itime;
2320 __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
2324 if (!dm->dqb_bsoftlimit ||
2325 dm->dqb_curspace < dm->dqb_bsoftlimit) {
2327 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
2328 } else if (!(di->dqb_valid & QIF_BTIME))
2329 /* Set grace only if user hasn't provided his own... */
2330 dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
2333 if (!dm->dqb_isoftlimit ||
2334 dm->dqb_curinodes < dm->dqb_isoftlimit) {
2336 clear_bit(DQ_INODES_B, &dquot->dq_flags);
2337 } else if (!(di->dqb_valid & QIF_ITIME))
2338 /* Set grace only if user hasn't provided his own... */
2339 dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
2341 if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit ||
2343 clear_bit(DQ_FAKE_B, &dquot->dq_flags);
2345 set_bit(DQ_FAKE_B, &dquot->dq_flags);
2346 spin_unlock(&dq_data_lock);
2347 mark_dquot_dirty(dquot);
2352 int vfs_set_dqblk(struct super_block *sb, int type, qid_t id,
2353 struct if_dqblk *di)
2355 struct dquot *dquot;
2358 dquot = dqget(sb, id, type);
2363 rc = do_set_dqblk(dquot, di);
2368 EXPORT_SYMBOL(vfs_set_dqblk);
2370 /* Generic routine for getting common part of quota file information */
2371 int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2373 struct mem_dqinfo *mi;
2375 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2376 if (!sb_has_quota_active(sb, type)) {
2377 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2380 mi = sb_dqopt(sb)->info + type;
2381 spin_lock(&dq_data_lock);
2382 ii->dqi_bgrace = mi->dqi_bgrace;
2383 ii->dqi_igrace = mi->dqi_igrace;
2384 ii->dqi_flags = mi->dqi_flags & DQF_MASK;
2385 ii->dqi_valid = IIF_ALL;
2386 spin_unlock(&dq_data_lock);
2387 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2390 EXPORT_SYMBOL(vfs_get_dqinfo);
2392 /* Generic routine for setting common part of quota file information */
2393 int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2395 struct mem_dqinfo *mi;
2398 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2399 if (!sb_has_quota_active(sb, type)) {
2403 mi = sb_dqopt(sb)->info + type;
2404 spin_lock(&dq_data_lock);
2405 if (ii->dqi_valid & IIF_BGRACE)
2406 mi->dqi_bgrace = ii->dqi_bgrace;
2407 if (ii->dqi_valid & IIF_IGRACE)
2408 mi->dqi_igrace = ii->dqi_igrace;
2409 if (ii->dqi_valid & IIF_FLAGS)
2410 mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) |
2411 (ii->dqi_flags & DQF_MASK);
2412 spin_unlock(&dq_data_lock);
2413 mark_info_dirty(sb, type);
2414 /* Force write to disk */
2415 sb->dq_op->write_info(sb, type);
2417 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2420 EXPORT_SYMBOL(vfs_set_dqinfo);
2422 const struct quotactl_ops vfs_quotactl_ops = {
2423 .quota_on = vfs_quota_on,
2424 .quota_off = vfs_quota_off,
2425 .quota_sync = vfs_quota_sync,
2426 .get_info = vfs_get_dqinfo,
2427 .set_info = vfs_set_dqinfo,
2428 .get_dqblk = vfs_get_dqblk,
2429 .set_dqblk = vfs_set_dqblk
2432 static ctl_table fs_dqstats_table[] = {
2434 .procname = "lookups",
2435 .data = &dqstats.lookups,
2436 .maxlen = sizeof(int),
2438 .proc_handler = proc_dointvec,
2441 .procname = "drops",
2442 .data = &dqstats.drops,
2443 .maxlen = sizeof(int),
2445 .proc_handler = proc_dointvec,
2448 .procname = "reads",
2449 .data = &dqstats.reads,
2450 .maxlen = sizeof(int),
2452 .proc_handler = proc_dointvec,
2455 .procname = "writes",
2456 .data = &dqstats.writes,
2457 .maxlen = sizeof(int),
2459 .proc_handler = proc_dointvec,
2462 .procname = "cache_hits",
2463 .data = &dqstats.cache_hits,
2464 .maxlen = sizeof(int),
2466 .proc_handler = proc_dointvec,
2469 .procname = "allocated_dquots",
2470 .data = &dqstats.allocated_dquots,
2471 .maxlen = sizeof(int),
2473 .proc_handler = proc_dointvec,
2476 .procname = "free_dquots",
2477 .data = &dqstats.free_dquots,
2478 .maxlen = sizeof(int),
2480 .proc_handler = proc_dointvec,
2483 .procname = "syncs",
2484 .data = &dqstats.syncs,
2485 .maxlen = sizeof(int),
2487 .proc_handler = proc_dointvec,
2489 #ifdef CONFIG_PRINT_QUOTA_WARNING
2491 .procname = "warnings",
2492 .data = &flag_print_warnings,
2493 .maxlen = sizeof(int),
2495 .proc_handler = proc_dointvec,
2501 static ctl_table fs_table[] = {
2503 .procname = "quota",
2505 .child = fs_dqstats_table,
2510 static ctl_table sys_table[] = {
2519 static int __init dquot_init(void)
2522 unsigned long nr_hash, order;
2524 printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
2526 register_sysctl_table(sys_table);
2528 dquot_cachep = kmem_cache_create("dquot",
2529 sizeof(struct dquot), sizeof(unsigned long) * 4,
2530 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
2531 SLAB_MEM_SPREAD|SLAB_PANIC),
2535 dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
2537 panic("Cannot create dquot hash table");
2539 /* Find power-of-two hlist_heads which can fit into allocation */
2540 nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
2544 } while (nr_hash >> dq_hash_bits);
2547 nr_hash = 1UL << dq_hash_bits;
2548 dq_hash_mask = nr_hash - 1;
2549 for (i = 0; i < nr_hash; i++)
2550 INIT_HLIST_HEAD(dquot_hash + i);
2552 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2553 nr_hash, order, (PAGE_SIZE << order));
2555 register_shrinker(&dqcache_shrinker);
2559 module_init(dquot_init);