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.. */
80 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
81 #include <net/netlink.h>
82 #include <net/genetlink.h>
85 #include <asm/uaccess.h>
87 #define __DQUOT_PARANOIA
90 * There are three quota SMP locks. dq_list_lock protects all lists with quotas
91 * and quota formats, dqstats structure containing statistics about the lists
92 * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
93 * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
94 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
95 * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
96 * modifications of quota state (on quotaon and quotaoff) and readers who care
97 * about latest values take it as well.
99 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
100 * dq_list_lock > dq_state_lock
102 * Note that some things (eg. sb pointer, type, id) doesn't change during
103 * the life of the dquot structure and so needn't to be protected by a lock
105 * Any operation working on dquots via inode pointers must hold dqptr_sem. If
106 * operation is just reading pointers from inode (or not using them at all) the
107 * read lock is enough. If pointers are altered function must hold write lock
108 * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
109 * for altering the flag i_mutex is also needed).
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 inline unsigned int
233 hashfn(const struct super_block *sb, unsigned int id, int type)
237 tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
238 return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
242 * Following list functions expect dq_list_lock to be held
244 static inline void insert_dquot_hash(struct dquot *dquot)
246 struct hlist_head *head;
247 head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type);
248 hlist_add_head(&dquot->dq_hash, head);
251 static inline void remove_dquot_hash(struct dquot *dquot)
253 hlist_del_init(&dquot->dq_hash);
256 static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb,
257 unsigned int id, int type)
259 struct hlist_node *node;
262 hlist_for_each (node, dquot_hash+hashent) {
263 dquot = hlist_entry(node, struct dquot, dq_hash);
264 if (dquot->dq_sb == sb && dquot->dq_id == id &&
265 dquot->dq_type == type)
271 /* Add a dquot to the tail of the free list */
272 static inline void put_dquot_last(struct dquot *dquot)
274 list_add_tail(&dquot->dq_free, &free_dquots);
275 dqstats.free_dquots++;
278 static inline void remove_free_dquot(struct dquot *dquot)
280 if (list_empty(&dquot->dq_free))
282 list_del_init(&dquot->dq_free);
283 dqstats.free_dquots--;
286 static inline void put_inuse(struct dquot *dquot)
288 /* We add to the back of inuse list so we don't have to restart
289 * when traversing this list and we block */
290 list_add_tail(&dquot->dq_inuse, &inuse_list);
291 dqstats.allocated_dquots++;
294 static inline void remove_inuse(struct dquot *dquot)
296 dqstats.allocated_dquots--;
297 list_del(&dquot->dq_inuse);
300 * End of list functions needing dq_list_lock
303 static void wait_on_dquot(struct dquot *dquot)
305 mutex_lock(&dquot->dq_lock);
306 mutex_unlock(&dquot->dq_lock);
309 static inline int dquot_dirty(struct dquot *dquot)
311 return test_bit(DQ_MOD_B, &dquot->dq_flags);
314 static inline int mark_dquot_dirty(struct dquot *dquot)
316 return dquot->dq_sb->dq_op->mark_dirty(dquot);
319 int dquot_mark_dquot_dirty(struct dquot *dquot)
321 spin_lock(&dq_list_lock);
322 if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags))
323 list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
324 info[dquot->dq_type].dqi_dirty_list);
325 spin_unlock(&dq_list_lock);
328 EXPORT_SYMBOL(dquot_mark_dquot_dirty);
330 /* This function needs dq_list_lock */
331 static inline int clear_dquot_dirty(struct dquot *dquot)
333 if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
335 list_del_init(&dquot->dq_dirty);
339 void mark_info_dirty(struct super_block *sb, int type)
341 set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
343 EXPORT_SYMBOL(mark_info_dirty);
346 * Read dquot from disk and alloc space for it
349 int dquot_acquire(struct dquot *dquot)
351 int ret = 0, ret2 = 0;
352 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
354 mutex_lock(&dquot->dq_lock);
355 mutex_lock(&dqopt->dqio_mutex);
356 if (!test_bit(DQ_READ_B, &dquot->dq_flags))
357 ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
360 set_bit(DQ_READ_B, &dquot->dq_flags);
361 /* Instantiate dquot if needed */
362 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
363 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
364 /* Write the info if needed */
365 if (info_dirty(&dqopt->info[dquot->dq_type])) {
366 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(
367 dquot->dq_sb, dquot->dq_type);
376 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
378 mutex_unlock(&dqopt->dqio_mutex);
379 mutex_unlock(&dquot->dq_lock);
382 EXPORT_SYMBOL(dquot_acquire);
385 * Write dquot to disk
387 int dquot_commit(struct dquot *dquot)
389 int ret = 0, ret2 = 0;
390 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
392 mutex_lock(&dqopt->dqio_mutex);
393 spin_lock(&dq_list_lock);
394 if (!clear_dquot_dirty(dquot)) {
395 spin_unlock(&dq_list_lock);
398 spin_unlock(&dq_list_lock);
399 /* Inactive dquot can be only if there was error during read/init
400 * => we have better not writing it */
401 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
402 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
403 if (info_dirty(&dqopt->info[dquot->dq_type])) {
404 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(
405 dquot->dq_sb, dquot->dq_type);
411 mutex_unlock(&dqopt->dqio_mutex);
414 EXPORT_SYMBOL(dquot_commit);
419 int dquot_release(struct dquot *dquot)
421 int ret = 0, ret2 = 0;
422 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
424 mutex_lock(&dquot->dq_lock);
425 /* Check whether we are not racing with some other dqget() */
426 if (atomic_read(&dquot->dq_count) > 1)
428 mutex_lock(&dqopt->dqio_mutex);
429 if (dqopt->ops[dquot->dq_type]->release_dqblk) {
430 ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
432 if (info_dirty(&dqopt->info[dquot->dq_type])) {
433 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(
434 dquot->dq_sb, dquot->dq_type);
439 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
440 mutex_unlock(&dqopt->dqio_mutex);
442 mutex_unlock(&dquot->dq_lock);
445 EXPORT_SYMBOL(dquot_release);
447 void dquot_destroy(struct dquot *dquot)
449 kmem_cache_free(dquot_cachep, dquot);
451 EXPORT_SYMBOL(dquot_destroy);
453 static inline void do_destroy_dquot(struct dquot *dquot)
455 dquot->dq_sb->dq_op->destroy_dquot(dquot);
458 /* Invalidate all dquots on the list. Note that this function is called after
459 * quota is disabled and pointers from inodes removed so there cannot be new
460 * quota users. There can still be some users of quotas due to inodes being
461 * just deleted or pruned by prune_icache() (those are not attached to any
462 * list) or parallel quotactl call. We have to wait for such users.
464 static void invalidate_dquots(struct super_block *sb, int type)
466 struct dquot *dquot, *tmp;
469 spin_lock(&dq_list_lock);
470 list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
471 if (dquot->dq_sb != sb)
473 if (dquot->dq_type != type)
475 /* Wait for dquot users */
476 if (atomic_read(&dquot->dq_count)) {
479 atomic_inc(&dquot->dq_count);
480 prepare_to_wait(&dquot->dq_wait_unused, &wait,
481 TASK_UNINTERRUPTIBLE);
482 spin_unlock(&dq_list_lock);
483 /* Once dqput() wakes us up, we know it's time to free
485 * IMPORTANT: we rely on the fact that there is always
486 * at most one process waiting for dquot to free.
487 * Otherwise dq_count would be > 1 and we would never
490 if (atomic_read(&dquot->dq_count) > 1)
492 finish_wait(&dquot->dq_wait_unused, &wait);
494 /* At this moment dquot() need not exist (it could be
495 * reclaimed by prune_dqcache(). Hence we must
500 * Quota now has no users and it has been written on last
503 remove_dquot_hash(dquot);
504 remove_free_dquot(dquot);
506 do_destroy_dquot(dquot);
508 spin_unlock(&dq_list_lock);
511 /* Call callback for every active dquot on given filesystem */
512 int dquot_scan_active(struct super_block *sb,
513 int (*fn)(struct dquot *dquot, unsigned long priv),
516 struct dquot *dquot, *old_dquot = NULL;
519 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
520 spin_lock(&dq_list_lock);
521 list_for_each_entry(dquot, &inuse_list, dq_inuse) {
522 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
524 if (dquot->dq_sb != sb)
526 /* Now we have active dquot so we can just increase use count */
527 atomic_inc(&dquot->dq_count);
529 spin_unlock(&dq_list_lock);
532 ret = fn(dquot, priv);
535 spin_lock(&dq_list_lock);
536 /* We are safe to continue now because our dquot could not
537 * be moved out of the inuse list while we hold the reference */
539 spin_unlock(&dq_list_lock);
542 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
545 EXPORT_SYMBOL(dquot_scan_active);
547 int vfs_quota_sync(struct super_block *sb, int type)
549 struct list_head *dirty;
551 struct quota_info *dqopt = sb_dqopt(sb);
554 mutex_lock(&dqopt->dqonoff_mutex);
555 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
556 if (type != -1 && cnt != type)
558 if (!sb_has_quota_active(sb, cnt))
560 spin_lock(&dq_list_lock);
561 dirty = &dqopt->info[cnt].dqi_dirty_list;
562 while (!list_empty(dirty)) {
563 dquot = list_first_entry(dirty, struct dquot,
565 /* Dirty and inactive can be only bad dquot... */
566 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
567 clear_dquot_dirty(dquot);
570 /* Now we have active dquot from which someone is
571 * holding reference so we can safely just increase
573 atomic_inc(&dquot->dq_count);
575 spin_unlock(&dq_list_lock);
576 sb->dq_op->write_dquot(dquot);
578 spin_lock(&dq_list_lock);
580 spin_unlock(&dq_list_lock);
583 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
584 if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt)
585 && info_dirty(&dqopt->info[cnt]))
586 sb->dq_op->write_info(sb, cnt);
587 spin_lock(&dq_list_lock);
589 spin_unlock(&dq_list_lock);
590 mutex_unlock(&dqopt->dqonoff_mutex);
594 EXPORT_SYMBOL(vfs_quota_sync);
596 /* Free unused dquots from cache */
597 static void prune_dqcache(int count)
599 struct list_head *head;
602 head = free_dquots.prev;
603 while (head != &free_dquots && count) {
604 dquot = list_entry(head, struct dquot, dq_free);
605 remove_dquot_hash(dquot);
606 remove_free_dquot(dquot);
608 do_destroy_dquot(dquot);
610 head = free_dquots.prev;
615 * This is called from kswapd when we think we need some
619 static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
622 spin_lock(&dq_list_lock);
624 spin_unlock(&dq_list_lock);
626 return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure;
629 static struct shrinker dqcache_shrinker = {
630 .shrink = shrink_dqcache_memory,
631 .seeks = DEFAULT_SEEKS,
635 * Put reference to dquot
636 * NOTE: If you change this function please check whether dqput_blocks() works right...
638 void dqput(struct dquot *dquot)
644 #ifdef __DQUOT_PARANOIA
645 if (!atomic_read(&dquot->dq_count)) {
646 printk("VFS: dqput: trying to free free dquot\n");
647 printk("VFS: device %s, dquot of %s %d\n",
649 quotatypes[dquot->dq_type],
655 spin_lock(&dq_list_lock);
657 spin_unlock(&dq_list_lock);
659 spin_lock(&dq_list_lock);
660 if (atomic_read(&dquot->dq_count) > 1) {
661 /* We have more than one user... nothing to do */
662 atomic_dec(&dquot->dq_count);
663 /* Releasing dquot during quotaoff phase? */
664 if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) &&
665 atomic_read(&dquot->dq_count) == 1)
666 wake_up(&dquot->dq_wait_unused);
667 spin_unlock(&dq_list_lock);
670 /* Need to release dquot? */
671 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
672 spin_unlock(&dq_list_lock);
673 /* Commit dquot before releasing */
674 ret = dquot->dq_sb->dq_op->write_dquot(dquot);
676 printk(KERN_ERR "VFS: cannot write quota structure on "
677 "device %s (error %d). Quota may get out of "
678 "sync!\n", dquot->dq_sb->s_id, ret);
680 * We clear dirty bit anyway, so that we avoid
683 spin_lock(&dq_list_lock);
684 clear_dquot_dirty(dquot);
685 spin_unlock(&dq_list_lock);
689 /* Clear flag in case dquot was inactive (something bad happened) */
690 clear_dquot_dirty(dquot);
691 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
692 spin_unlock(&dq_list_lock);
693 dquot->dq_sb->dq_op->release_dquot(dquot);
696 atomic_dec(&dquot->dq_count);
697 #ifdef __DQUOT_PARANOIA
699 BUG_ON(!list_empty(&dquot->dq_free));
701 put_dquot_last(dquot);
702 spin_unlock(&dq_list_lock);
704 EXPORT_SYMBOL(dqput);
706 struct dquot *dquot_alloc(struct super_block *sb, int type)
708 return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
710 EXPORT_SYMBOL(dquot_alloc);
712 static struct dquot *get_empty_dquot(struct super_block *sb, int type)
716 dquot = sb->dq_op->alloc_dquot(sb, type);
720 mutex_init(&dquot->dq_lock);
721 INIT_LIST_HEAD(&dquot->dq_free);
722 INIT_LIST_HEAD(&dquot->dq_inuse);
723 INIT_HLIST_NODE(&dquot->dq_hash);
724 INIT_LIST_HEAD(&dquot->dq_dirty);
725 init_waitqueue_head(&dquot->dq_wait_unused);
727 dquot->dq_type = type;
728 atomic_set(&dquot->dq_count, 1);
734 * Get reference to dquot
736 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
737 * destroying our dquot by:
738 * a) checking for quota flags under dq_list_lock and
739 * b) getting a reference to dquot before we release dq_list_lock
741 struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
743 unsigned int hashent = hashfn(sb, id, type);
744 struct dquot *dquot = NULL, *empty = NULL;
746 if (!sb_has_quota_active(sb, type))
749 spin_lock(&dq_list_lock);
750 spin_lock(&dq_state_lock);
751 if (!sb_has_quota_active(sb, type)) {
752 spin_unlock(&dq_state_lock);
753 spin_unlock(&dq_list_lock);
756 spin_unlock(&dq_state_lock);
758 dquot = find_dquot(hashent, sb, id, type);
761 spin_unlock(&dq_list_lock);
762 empty = get_empty_dquot(sb, type);
764 schedule(); /* Try to wait for a moment... */
770 /* all dquots go on the inuse_list */
772 /* hash it first so it can be found */
773 insert_dquot_hash(dquot);
775 spin_unlock(&dq_list_lock);
777 if (!atomic_read(&dquot->dq_count))
778 remove_free_dquot(dquot);
779 atomic_inc(&dquot->dq_count);
780 dqstats.cache_hits++;
782 spin_unlock(&dq_list_lock);
784 /* Wait for dq_lock - after this we know that either dquot_release() is
785 * already finished or it will be canceled due to dq_count > 1 test */
786 wait_on_dquot(dquot);
787 /* Read the dquot / allocate space in quota file */
788 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) &&
789 sb->dq_op->acquire_dquot(dquot) < 0) {
794 #ifdef __DQUOT_PARANOIA
795 BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
799 do_destroy_dquot(empty);
803 EXPORT_SYMBOL(dqget);
805 static int dqinit_needed(struct inode *inode, int type)
809 if (IS_NOQUOTA(inode))
812 return !inode->i_dquot[type];
813 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
814 if (!inode->i_dquot[cnt])
819 /* This routine is guarded by dqonoff_mutex mutex */
820 static void add_dquot_ref(struct super_block *sb, int type)
822 struct inode *inode, *old_inode = NULL;
824 spin_lock(&inode_lock);
825 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
826 if (!atomic_read(&inode->i_writecount))
828 if (!dqinit_needed(inode, type))
830 if (inode->i_state & (I_FREEING|I_WILL_FREE))
834 spin_unlock(&inode_lock);
837 sb->dq_op->initialize(inode, type);
838 /* We hold a reference to 'inode' so it couldn't have been
839 * removed from s_inodes list while we dropped the inode_lock.
840 * We cannot iput the inode now as we can be holding the last
841 * reference and we cannot iput it under inode_lock. So we
842 * keep the reference and iput it later. */
844 spin_lock(&inode_lock);
846 spin_unlock(&inode_lock);
851 * Return 0 if dqput() won't block.
852 * (note that 1 doesn't necessarily mean blocking)
854 static inline int dqput_blocks(struct dquot *dquot)
856 if (atomic_read(&dquot->dq_count) <= 1)
862 * Remove references to dquots from inode and add dquot to list for freeing
863 * if we have the last referece to dquot
864 * We can't race with anybody because we hold dqptr_sem for writing...
866 static int remove_inode_dquot_ref(struct inode *inode, int type,
867 struct list_head *tofree_head)
869 struct dquot *dquot = inode->i_dquot[type];
871 inode->i_dquot[type] = NULL;
873 if (dqput_blocks(dquot)) {
874 #ifdef __DQUOT_PARANOIA
875 if (atomic_read(&dquot->dq_count) != 1)
876 printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count));
878 spin_lock(&dq_list_lock);
879 /* As dquot must have currently users it can't be on
880 * the free list... */
881 list_add(&dquot->dq_free, tofree_head);
882 spin_unlock(&dq_list_lock);
886 dqput(dquot); /* We have guaranteed we won't block */
892 * Free list of dquots
893 * Dquots are removed from inodes and no new references can be got so we are
894 * the only ones holding reference
896 static void put_dquot_list(struct list_head *tofree_head)
898 struct list_head *act_head;
901 act_head = tofree_head->next;
902 while (act_head != tofree_head) {
903 dquot = list_entry(act_head, struct dquot, dq_free);
904 act_head = act_head->next;
905 /* Remove dquot from the list so we won't have problems... */
906 list_del_init(&dquot->dq_free);
911 static void remove_dquot_ref(struct super_block *sb, int type,
912 struct list_head *tofree_head)
916 spin_lock(&inode_lock);
917 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
918 if (!IS_NOQUOTA(inode))
919 remove_inode_dquot_ref(inode, type, tofree_head);
921 spin_unlock(&inode_lock);
924 /* Gather all references from inodes and drop them */
925 static void drop_dquot_ref(struct super_block *sb, int type)
927 LIST_HEAD(tofree_head);
930 down_write(&sb_dqopt(sb)->dqptr_sem);
931 remove_dquot_ref(sb, type, &tofree_head);
932 up_write(&sb_dqopt(sb)->dqptr_sem);
933 put_dquot_list(&tofree_head);
937 static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
939 dquot->dq_dqb.dqb_curinodes += number;
942 static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
944 dquot->dq_dqb.dqb_curspace += number;
947 static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
949 dquot->dq_dqb.dqb_rsvspace += number;
953 * Claim reserved quota space
955 static void dquot_claim_reserved_space(struct dquot *dquot,
958 WARN_ON(dquot->dq_dqb.dqb_rsvspace < number);
959 dquot->dq_dqb.dqb_curspace += number;
960 dquot->dq_dqb.dqb_rsvspace -= number;
964 void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
966 dquot->dq_dqb.dqb_rsvspace -= number;
969 static void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
971 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
972 dquot->dq_dqb.dqb_curinodes >= number)
973 dquot->dq_dqb.dqb_curinodes -= number;
975 dquot->dq_dqb.dqb_curinodes = 0;
976 if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
977 dquot->dq_dqb.dqb_itime = (time_t) 0;
978 clear_bit(DQ_INODES_B, &dquot->dq_flags);
981 static void dquot_decr_space(struct dquot *dquot, qsize_t number)
983 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
984 dquot->dq_dqb.dqb_curspace >= number)
985 dquot->dq_dqb.dqb_curspace -= number;
987 dquot->dq_dqb.dqb_curspace = 0;
988 if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
989 dquot->dq_dqb.dqb_btime = (time_t) 0;
990 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
993 static int warning_issued(struct dquot *dquot, const int warntype)
995 int flag = (warntype == QUOTA_NL_BHARDWARN ||
996 warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
997 ((warntype == QUOTA_NL_IHARDWARN ||
998 warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
1002 return test_and_set_bit(flag, &dquot->dq_flags);
1005 #ifdef CONFIG_PRINT_QUOTA_WARNING
1006 static int flag_print_warnings = 1;
1008 static int need_print_warning(struct dquot *dquot)
1010 if (!flag_print_warnings)
1013 switch (dquot->dq_type) {
1015 return current_fsuid() == dquot->dq_id;
1017 return in_group_p(dquot->dq_id);
1022 /* Print warning to user which exceeded quota */
1023 static void print_warning(struct dquot *dquot, const int warntype)
1026 struct tty_struct *tty;
1028 if (warntype == QUOTA_NL_IHARDBELOW ||
1029 warntype == QUOTA_NL_ISOFTBELOW ||
1030 warntype == QUOTA_NL_BHARDBELOW ||
1031 warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot))
1034 tty = get_current_tty();
1037 tty_write_message(tty, dquot->dq_sb->s_id);
1038 if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
1039 tty_write_message(tty, ": warning, ");
1041 tty_write_message(tty, ": write failed, ");
1042 tty_write_message(tty, quotatypes[dquot->dq_type]);
1044 case QUOTA_NL_IHARDWARN:
1045 msg = " file limit reached.\r\n";
1047 case QUOTA_NL_ISOFTLONGWARN:
1048 msg = " file quota exceeded too long.\r\n";
1050 case QUOTA_NL_ISOFTWARN:
1051 msg = " file quota exceeded.\r\n";
1053 case QUOTA_NL_BHARDWARN:
1054 msg = " block limit reached.\r\n";
1056 case QUOTA_NL_BSOFTLONGWARN:
1057 msg = " block quota exceeded too long.\r\n";
1059 case QUOTA_NL_BSOFTWARN:
1060 msg = " block quota exceeded.\r\n";
1063 tty_write_message(tty, msg);
1068 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
1070 /* Netlink family structure for quota */
1071 static struct genl_family quota_genl_family = {
1072 .id = GENL_ID_GENERATE,
1074 .name = "VFS_DQUOT",
1076 .maxattr = QUOTA_NL_A_MAX,
1079 /* Send warning to userspace about user which exceeded quota */
1080 static void send_warning(const struct dquot *dquot, const char warntype)
1082 static atomic_t seq;
1083 struct sk_buff *skb;
1086 int msg_size = 4 * nla_total_size(sizeof(u32)) +
1087 2 * nla_total_size(sizeof(u64));
1089 /* We have to allocate using GFP_NOFS as we are called from a
1090 * filesystem performing write and thus further recursion into
1091 * the fs to free some data could cause deadlocks. */
1092 skb = genlmsg_new(msg_size, GFP_NOFS);
1095 "VFS: Not enough memory to send quota warning.\n");
1098 msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq),
1099 "a_genl_family, 0, QUOTA_NL_C_WARNING);
1102 "VFS: Cannot store netlink header in quota warning.\n");
1105 ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, dquot->dq_type);
1108 ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, dquot->dq_id);
1111 ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype);
1114 ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR,
1115 MAJOR(dquot->dq_sb->s_dev));
1118 ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR,
1119 MINOR(dquot->dq_sb->s_dev));
1122 ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current_uid());
1125 genlmsg_end(skb, msg_head);
1127 genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS);
1130 printk(KERN_ERR "VFS: Not enough space to compose quota message!\n");
1136 * Write warnings to the console and send warning messages over netlink.
1138 * Note that this function can sleep.
1140 static void flush_warnings(struct dquot *const *dquots, char *warntype)
1144 for (i = 0; i < MAXQUOTAS; i++)
1145 if (dquots[i] && warntype[i] != QUOTA_NL_NOWARN &&
1146 !warning_issued(dquots[i], warntype[i])) {
1147 #ifdef CONFIG_PRINT_QUOTA_WARNING
1148 print_warning(dquots[i], warntype[i]);
1150 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
1151 send_warning(dquots[i], warntype[i]);
1156 static int ignore_hardlimit(struct dquot *dquot)
1158 struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
1160 return capable(CAP_SYS_RESOURCE) &&
1161 (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD ||
1162 !(info->dqi_flags & V1_DQF_RSQUASH));
1165 /* needs dq_data_lock */
1166 static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype)
1168 qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes;
1170 *warntype = QUOTA_NL_NOWARN;
1171 if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
1172 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1175 if (dquot->dq_dqb.dqb_ihardlimit &&
1176 newinodes > dquot->dq_dqb.dqb_ihardlimit &&
1177 !ignore_hardlimit(dquot)) {
1178 *warntype = QUOTA_NL_IHARDWARN;
1182 if (dquot->dq_dqb.dqb_isoftlimit &&
1183 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1184 dquot->dq_dqb.dqb_itime &&
1185 get_seconds() >= dquot->dq_dqb.dqb_itime &&
1186 !ignore_hardlimit(dquot)) {
1187 *warntype = QUOTA_NL_ISOFTLONGWARN;
1191 if (dquot->dq_dqb.dqb_isoftlimit &&
1192 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1193 dquot->dq_dqb.dqb_itime == 0) {
1194 *warntype = QUOTA_NL_ISOFTWARN;
1195 dquot->dq_dqb.dqb_itime = get_seconds() +
1196 sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
1202 /* needs dq_data_lock */
1203 static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype)
1206 struct super_block *sb = dquot->dq_sb;
1208 *warntype = QUOTA_NL_NOWARN;
1209 if (!sb_has_quota_limits_enabled(sb, dquot->dq_type) ||
1210 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1213 tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace
1216 if (dquot->dq_dqb.dqb_bhardlimit &&
1217 tspace > dquot->dq_dqb.dqb_bhardlimit &&
1218 !ignore_hardlimit(dquot)) {
1220 *warntype = QUOTA_NL_BHARDWARN;
1224 if (dquot->dq_dqb.dqb_bsoftlimit &&
1225 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
1226 dquot->dq_dqb.dqb_btime &&
1227 get_seconds() >= dquot->dq_dqb.dqb_btime &&
1228 !ignore_hardlimit(dquot)) {
1230 *warntype = QUOTA_NL_BSOFTLONGWARN;
1234 if (dquot->dq_dqb.dqb_bsoftlimit &&
1235 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
1236 dquot->dq_dqb.dqb_btime == 0) {
1238 *warntype = QUOTA_NL_BSOFTWARN;
1239 dquot->dq_dqb.dqb_btime = get_seconds() +
1240 sb_dqopt(sb)->info[dquot->dq_type].dqi_bgrace;
1244 * We don't allow preallocation to exceed softlimit so exceeding will
1253 static int info_idq_free(struct dquot *dquot, qsize_t inodes)
1257 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1258 dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit ||
1259 !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type))
1260 return QUOTA_NL_NOWARN;
1262 newinodes = dquot->dq_dqb.dqb_curinodes - inodes;
1263 if (newinodes <= dquot->dq_dqb.dqb_isoftlimit)
1264 return QUOTA_NL_ISOFTBELOW;
1265 if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
1266 newinodes < dquot->dq_dqb.dqb_ihardlimit)
1267 return QUOTA_NL_IHARDBELOW;
1268 return QUOTA_NL_NOWARN;
1271 static int info_bdq_free(struct dquot *dquot, qsize_t space)
1273 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1274 dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
1275 return QUOTA_NL_NOWARN;
1277 if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit)
1278 return QUOTA_NL_BSOFTBELOW;
1279 if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit &&
1280 dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit)
1281 return QUOTA_NL_BHARDBELOW;
1282 return QUOTA_NL_NOWARN;
1285 * Initialize quota pointers in inode
1286 * We do things in a bit complicated way but by that we avoid calling
1287 * dqget() and thus filesystem callbacks under dqptr_sem.
1289 int dquot_initialize(struct inode *inode, int type)
1291 unsigned int id = 0;
1293 struct dquot *got[MAXQUOTAS] = { NULL, NULL };
1294 struct super_block *sb = inode->i_sb;
1296 /* First test before acquiring mutex - solves deadlocks when we
1297 * re-enter the quota code and are already holding the mutex */
1298 if (IS_NOQUOTA(inode))
1301 /* First get references to structures we might need. */
1302 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1303 if (type != -1 && cnt != type)
1313 got[cnt] = dqget(sb, id, cnt);
1316 down_write(&sb_dqopt(sb)->dqptr_sem);
1317 /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
1318 if (IS_NOQUOTA(inode))
1320 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1321 if (type != -1 && cnt != type)
1323 /* Avoid races with quotaoff() */
1324 if (!sb_has_quota_active(sb, cnt))
1326 if (!inode->i_dquot[cnt]) {
1327 inode->i_dquot[cnt] = got[cnt];
1332 up_write(&sb_dqopt(sb)->dqptr_sem);
1333 /* Drop unused references */
1334 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1338 EXPORT_SYMBOL(dquot_initialize);
1341 * Release all quotas referenced by inode
1343 int dquot_drop(struct inode *inode)
1346 struct dquot *put[MAXQUOTAS];
1348 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1349 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1350 put[cnt] = inode->i_dquot[cnt];
1351 inode->i_dquot[cnt] = NULL;
1353 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1355 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1359 EXPORT_SYMBOL(dquot_drop);
1361 /* Wrapper to remove references to quota structures from inode */
1362 void vfs_dq_drop(struct inode *inode)
1364 /* Here we can get arbitrary inode from clear_inode() so we have
1365 * to be careful. OTOH we don't need locking as quota operations
1366 * are allowed to change only at mount time */
1367 if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op
1368 && inode->i_sb->dq_op->drop) {
1370 /* Test before calling to rule out calls from proc and such
1371 * where we are not allowed to block. Note that this is
1372 * actually reliable test even without the lock - the caller
1373 * must assure that nobody can come after the DQUOT_DROP and
1374 * add quota pointers back anyway */
1375 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1376 if (inode->i_dquot[cnt])
1378 if (cnt < MAXQUOTAS)
1379 inode->i_sb->dq_op->drop(inode);
1382 EXPORT_SYMBOL(vfs_dq_drop);
1385 * Following four functions update i_blocks+i_bytes fields and
1386 * quota information (together with appropriate checks)
1387 * NOTE: We absolutely rely on the fact that caller dirties
1388 * the inode (usually macros in quotaops.h care about this) and
1389 * holds a handle for the current transaction so that dquot write and
1390 * inode write go into the same transaction.
1394 * This operation can block, but only after everything is updated
1396 int __dquot_alloc_space(struct inode *inode, qsize_t number,
1397 int warn, int reserve)
1399 int cnt, ret = QUOTA_OK;
1400 char warntype[MAXQUOTAS];
1402 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1403 warntype[cnt] = QUOTA_NL_NOWARN;
1405 spin_lock(&dq_data_lock);
1406 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1407 if (!inode->i_dquot[cnt])
1409 if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt)
1415 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1416 if (!inode->i_dquot[cnt])
1419 dquot_resv_space(inode->i_dquot[cnt], number);
1421 dquot_incr_space(inode->i_dquot[cnt], number);
1424 inode_add_bytes(inode, number);
1426 spin_unlock(&dq_data_lock);
1427 flush_warnings(inode->i_dquot, warntype);
1431 int dquot_alloc_space(struct inode *inode, qsize_t number, int warn)
1433 int cnt, ret = QUOTA_OK;
1436 * First test before acquiring mutex - solves deadlocks when we
1437 * re-enter the quota code and are already holding the mutex
1439 if (IS_NOQUOTA(inode)) {
1440 inode_add_bytes(inode, number);
1444 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1445 if (IS_NOQUOTA(inode)) {
1446 inode_add_bytes(inode, number);
1450 ret = __dquot_alloc_space(inode, number, warn, 0);
1451 if (ret == NO_QUOTA)
1454 /* Dirtify all the dquots - this can block when journalling */
1455 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1456 if (inode->i_dquot[cnt])
1457 mark_dquot_dirty(inode->i_dquot[cnt]);
1459 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1463 EXPORT_SYMBOL(dquot_alloc_space);
1465 int dquot_reserve_space(struct inode *inode, qsize_t number, int warn)
1469 if (IS_NOQUOTA(inode))
1472 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1473 if (IS_NOQUOTA(inode))
1476 ret = __dquot_alloc_space(inode, number, warn, 1);
1478 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1482 EXPORT_SYMBOL(dquot_reserve_space);
1485 * This operation can block, but only after everything is updated
1487 int dquot_alloc_inode(const struct inode *inode, qsize_t number)
1489 int cnt, ret = NO_QUOTA;
1490 char warntype[MAXQUOTAS];
1492 /* First test before acquiring mutex - solves deadlocks when we
1493 * re-enter the quota code and are already holding the mutex */
1494 if (IS_NOQUOTA(inode))
1496 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1497 warntype[cnt] = QUOTA_NL_NOWARN;
1498 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1499 if (IS_NOQUOTA(inode)) {
1500 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1503 spin_lock(&dq_data_lock);
1504 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1505 if (!inode->i_dquot[cnt])
1507 if (check_idq(inode->i_dquot[cnt], number, warntype+cnt)
1512 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1513 if (!inode->i_dquot[cnt])
1515 dquot_incr_inodes(inode->i_dquot[cnt], number);
1519 spin_unlock(&dq_data_lock);
1520 if (ret == QUOTA_OK)
1521 /* Dirtify all the dquots - this can block when journalling */
1522 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1523 if (inode->i_dquot[cnt])
1524 mark_dquot_dirty(inode->i_dquot[cnt]);
1525 flush_warnings(inode->i_dquot, warntype);
1526 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1529 EXPORT_SYMBOL(dquot_alloc_inode);
1531 int dquot_claim_space(struct inode *inode, qsize_t number)
1536 if (IS_NOQUOTA(inode)) {
1537 inode_add_bytes(inode, number);
1541 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1542 if (IS_NOQUOTA(inode)) {
1543 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1544 inode_add_bytes(inode, number);
1548 spin_lock(&dq_data_lock);
1549 /* Claim reserved quotas to allocated quotas */
1550 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1551 if (inode->i_dquot[cnt])
1552 dquot_claim_reserved_space(inode->i_dquot[cnt],
1555 /* Update inode bytes */
1556 inode_add_bytes(inode, number);
1557 spin_unlock(&dq_data_lock);
1558 /* Dirtify all the dquots - this can block when journalling */
1559 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1560 if (inode->i_dquot[cnt])
1561 mark_dquot_dirty(inode->i_dquot[cnt]);
1562 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1566 EXPORT_SYMBOL(dquot_claim_space);
1569 * Release reserved quota space
1571 void dquot_release_reserved_space(struct inode *inode, qsize_t number)
1575 if (IS_NOQUOTA(inode))
1578 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1579 if (IS_NOQUOTA(inode))
1582 spin_lock(&dq_data_lock);
1583 /* Release reserved dquots */
1584 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1585 if (inode->i_dquot[cnt])
1586 dquot_free_reserved_space(inode->i_dquot[cnt], number);
1588 spin_unlock(&dq_data_lock);
1591 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1595 EXPORT_SYMBOL(dquot_release_reserved_space);
1598 * This operation can block, but only after everything is updated
1600 int dquot_free_space(struct inode *inode, qsize_t number)
1603 char warntype[MAXQUOTAS];
1605 /* First test before acquiring mutex - solves deadlocks when we
1606 * re-enter the quota code and are already holding the mutex */
1607 if (IS_NOQUOTA(inode)) {
1609 inode_sub_bytes(inode, number);
1613 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1614 /* Now recheck reliably when holding dqptr_sem */
1615 if (IS_NOQUOTA(inode)) {
1616 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1619 spin_lock(&dq_data_lock);
1620 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1621 if (!inode->i_dquot[cnt])
1623 warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number);
1624 dquot_decr_space(inode->i_dquot[cnt], number);
1626 inode_sub_bytes(inode, number);
1627 spin_unlock(&dq_data_lock);
1628 /* Dirtify all the dquots - this can block when journalling */
1629 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1630 if (inode->i_dquot[cnt])
1631 mark_dquot_dirty(inode->i_dquot[cnt]);
1632 flush_warnings(inode->i_dquot, warntype);
1633 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 int dquot_free_inode(const struct inode *inode, qsize_t number)
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 (IS_NOQUOTA(inode))
1651 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1652 /* Now recheck reliably when holding dqptr_sem */
1653 if (IS_NOQUOTA(inode)) {
1654 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1657 spin_lock(&dq_data_lock);
1658 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1659 if (!inode->i_dquot[cnt])
1661 warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number);
1662 dquot_decr_inodes(inode->i_dquot[cnt], number);
1664 spin_unlock(&dq_data_lock);
1665 /* Dirtify all the dquots - this can block when journalling */
1666 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1667 if (inode->i_dquot[cnt])
1668 mark_dquot_dirty(inode->i_dquot[cnt]);
1669 flush_warnings(inode->i_dquot, warntype);
1670 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1673 EXPORT_SYMBOL(dquot_free_inode);
1676 * call back function, get reserved quota space from underlying fs
1678 qsize_t dquot_get_reserved_space(struct inode *inode)
1680 qsize_t reserved_space = 0;
1682 if (sb_any_quota_active(inode->i_sb) &&
1683 inode->i_sb->dq_op->get_reserved_space)
1684 reserved_space = inode->i_sb->dq_op->get_reserved_space(inode);
1685 return reserved_space;
1689 * Transfer the number of inode and blocks from one diskquota to an other.
1691 * This operation can block, but only after everything is updated
1692 * A transaction must be started when entering this function.
1694 int dquot_transfer(struct inode *inode, struct iattr *iattr)
1696 qsize_t space, cur_space;
1697 qsize_t rsv_space = 0;
1698 struct dquot *transfer_from[MAXQUOTAS];
1699 struct dquot *transfer_to[MAXQUOTAS];
1700 int cnt, ret = QUOTA_OK;
1701 int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid,
1702 chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid;
1703 char warntype_to[MAXQUOTAS];
1704 char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS];
1706 /* First test before acquiring mutex - solves deadlocks when we
1707 * re-enter the quota code and are already holding the mutex */
1708 if (IS_NOQUOTA(inode))
1710 /* Initialize the arrays */
1711 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1712 transfer_from[cnt] = NULL;
1713 transfer_to[cnt] = NULL;
1714 warntype_to[cnt] = QUOTA_NL_NOWARN;
1717 transfer_to[USRQUOTA] = dqget(inode->i_sb, iattr->ia_uid,
1720 transfer_to[GRPQUOTA] = dqget(inode->i_sb, iattr->ia_gid,
1723 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1724 /* Now recheck reliably when holding dqptr_sem */
1725 if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
1726 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1729 spin_lock(&dq_data_lock);
1730 cur_space = inode_get_bytes(inode);
1731 rsv_space = dquot_get_reserved_space(inode);
1732 space = cur_space + rsv_space;
1733 /* Build the transfer_from list and check the limits */
1734 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1735 if (!transfer_to[cnt])
1737 transfer_from[cnt] = inode->i_dquot[cnt];
1738 if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) ==
1739 NO_QUOTA || check_bdq(transfer_to[cnt], space, 0,
1740 warntype_to + cnt) == NO_QUOTA)
1745 * Finally perform the needed transfer from transfer_from to transfer_to
1747 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1749 * Skip changes for same uid or gid or for turned off quota-type.
1751 if (!transfer_to[cnt])
1754 /* Due to IO error we might not have transfer_from[] structure */
1755 if (transfer_from[cnt]) {
1756 warntype_from_inodes[cnt] =
1757 info_idq_free(transfer_from[cnt], 1);
1758 warntype_from_space[cnt] =
1759 info_bdq_free(transfer_from[cnt], space);
1760 dquot_decr_inodes(transfer_from[cnt], 1);
1761 dquot_decr_space(transfer_from[cnt], cur_space);
1762 dquot_free_reserved_space(transfer_from[cnt],
1766 dquot_incr_inodes(transfer_to[cnt], 1);
1767 dquot_incr_space(transfer_to[cnt], cur_space);
1768 dquot_resv_space(transfer_to[cnt], rsv_space);
1770 inode->i_dquot[cnt] = transfer_to[cnt];
1772 spin_unlock(&dq_data_lock);
1773 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1775 /* Dirtify all the dquots - this can block when journalling */
1776 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1777 if (transfer_from[cnt])
1778 mark_dquot_dirty(transfer_from[cnt]);
1779 if (transfer_to[cnt]) {
1780 mark_dquot_dirty(transfer_to[cnt]);
1781 /* The reference we got is transferred to the inode */
1782 transfer_to[cnt] = NULL;
1786 flush_warnings(transfer_to, warntype_to);
1787 flush_warnings(transfer_from, warntype_from_inodes);
1788 flush_warnings(transfer_from, warntype_from_space);
1790 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1791 dqput(transfer_from[cnt]);
1792 dqput(transfer_to[cnt]);
1796 spin_unlock(&dq_data_lock);
1797 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1798 /* Clear dquot pointers we don't want to dqput() */
1799 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1800 transfer_from[cnt] = NULL;
1804 EXPORT_SYMBOL(dquot_transfer);
1806 /* Wrapper for transferring ownership of an inode */
1807 int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
1809 if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) {
1811 if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA)
1816 EXPORT_SYMBOL(vfs_dq_transfer);
1819 * Write info of quota file to disk
1821 int dquot_commit_info(struct super_block *sb, int type)
1824 struct quota_info *dqopt = sb_dqopt(sb);
1826 mutex_lock(&dqopt->dqio_mutex);
1827 ret = dqopt->ops[type]->write_file_info(sb, type);
1828 mutex_unlock(&dqopt->dqio_mutex);
1831 EXPORT_SYMBOL(dquot_commit_info);
1834 * Definitions of diskquota operations.
1836 struct dquot_operations dquot_operations = {
1837 .initialize = dquot_initialize,
1839 .alloc_space = dquot_alloc_space,
1840 .alloc_inode = dquot_alloc_inode,
1841 .free_space = dquot_free_space,
1842 .free_inode = dquot_free_inode,
1843 .transfer = dquot_transfer,
1844 .write_dquot = dquot_commit,
1845 .acquire_dquot = dquot_acquire,
1846 .release_dquot = dquot_release,
1847 .mark_dirty = dquot_mark_dquot_dirty,
1848 .write_info = dquot_commit_info,
1849 .alloc_dquot = dquot_alloc,
1850 .destroy_dquot = dquot_destroy,
1854 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1856 int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags)
1859 struct quota_info *dqopt = sb_dqopt(sb);
1860 struct inode *toputinode[MAXQUOTAS];
1862 /* Cannot turn off usage accounting without turning off limits, or
1863 * suspend quotas and simultaneously turn quotas off. */
1864 if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED))
1865 || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED |
1866 DQUOT_USAGE_ENABLED)))
1869 /* We need to serialize quota_off() for device */
1870 mutex_lock(&dqopt->dqonoff_mutex);
1873 * Skip everything if there's nothing to do. We have to do this because
1874 * sometimes we are called when fill_super() failed and calling
1875 * sync_fs() in such cases does no good.
1877 if (!sb_any_quota_loaded(sb)) {
1878 mutex_unlock(&dqopt->dqonoff_mutex);
1881 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1882 toputinode[cnt] = NULL;
1883 if (type != -1 && cnt != type)
1885 if (!sb_has_quota_loaded(sb, cnt))
1888 if (flags & DQUOT_SUSPENDED) {
1889 spin_lock(&dq_state_lock);
1891 dquot_state_flag(DQUOT_SUSPENDED, cnt);
1892 spin_unlock(&dq_state_lock);
1894 spin_lock(&dq_state_lock);
1895 dqopt->flags &= ~dquot_state_flag(flags, cnt);
1896 /* Turning off suspended quotas? */
1897 if (!sb_has_quota_loaded(sb, cnt) &&
1898 sb_has_quota_suspended(sb, cnt)) {
1899 dqopt->flags &= ~dquot_state_flag(
1900 DQUOT_SUSPENDED, cnt);
1901 spin_unlock(&dq_state_lock);
1902 iput(dqopt->files[cnt]);
1903 dqopt->files[cnt] = NULL;
1906 spin_unlock(&dq_state_lock);
1909 /* We still have to keep quota loaded? */
1910 if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED))
1913 /* Note: these are blocking operations */
1914 drop_dquot_ref(sb, cnt);
1915 invalidate_dquots(sb, cnt);
1917 * Now all dquots should be invalidated, all writes done so we
1918 * should be only users of the info. No locks needed.
1920 if (info_dirty(&dqopt->info[cnt]))
1921 sb->dq_op->write_info(sb, cnt);
1922 if (dqopt->ops[cnt]->free_file_info)
1923 dqopt->ops[cnt]->free_file_info(sb, cnt);
1924 put_quota_format(dqopt->info[cnt].dqi_format);
1926 toputinode[cnt] = dqopt->files[cnt];
1927 if (!sb_has_quota_loaded(sb, cnt))
1928 dqopt->files[cnt] = NULL;
1929 dqopt->info[cnt].dqi_flags = 0;
1930 dqopt->info[cnt].dqi_igrace = 0;
1931 dqopt->info[cnt].dqi_bgrace = 0;
1932 dqopt->ops[cnt] = NULL;
1934 mutex_unlock(&dqopt->dqonoff_mutex);
1936 /* Skip syncing and setting flags if quota files are hidden */
1937 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
1940 /* Sync the superblock so that buffers with quota data are written to
1941 * disk (and so userspace sees correct data afterwards). */
1942 if (sb->s_op->sync_fs)
1943 sb->s_op->sync_fs(sb, 1);
1944 sync_blockdev(sb->s_bdev);
1945 /* Now the quota files are just ordinary files and we can set the
1946 * inode flags back. Moreover we discard the pagecache so that
1947 * userspace sees the writes we did bypassing the pagecache. We
1948 * must also discard the blockdev buffers so that we see the
1949 * changes done by userspace on the next quotaon() */
1950 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1951 if (toputinode[cnt]) {
1952 mutex_lock(&dqopt->dqonoff_mutex);
1953 /* If quota was reenabled in the meantime, we have
1955 if (!sb_has_quota_loaded(sb, cnt)) {
1956 mutex_lock_nested(&toputinode[cnt]->i_mutex,
1958 toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
1959 S_NOATIME | S_NOQUOTA);
1960 truncate_inode_pages(&toputinode[cnt]->i_data,
1962 mutex_unlock(&toputinode[cnt]->i_mutex);
1963 mark_inode_dirty(toputinode[cnt]);
1965 mutex_unlock(&dqopt->dqonoff_mutex);
1968 invalidate_bdev(sb->s_bdev);
1970 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1971 if (toputinode[cnt]) {
1972 /* On remount RO, we keep the inode pointer so that we
1973 * can reenable quota on the subsequent remount RW. We
1974 * have to check 'flags' variable and not use sb_has_
1975 * function because another quotaon / quotaoff could
1976 * change global state before we got here. We refuse
1977 * to suspend quotas when there is pending delete on
1978 * the quota file... */
1979 if (!(flags & DQUOT_SUSPENDED))
1980 iput(toputinode[cnt]);
1981 else if (!toputinode[cnt]->i_nlink)
1986 EXPORT_SYMBOL(vfs_quota_disable);
1988 int vfs_quota_off(struct super_block *sb, int type, int remount)
1990 return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED :
1991 (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED));
1993 EXPORT_SYMBOL(vfs_quota_off);
1995 * Turn quotas on on a device
1999 * Helper function to turn quotas on when we already have the inode of
2000 * quota file and no quota information is loaded.
2002 static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
2005 struct quota_format_type *fmt = find_quota_format(format_id);
2006 struct super_block *sb = inode->i_sb;
2007 struct quota_info *dqopt = sb_dqopt(sb);
2013 if (!S_ISREG(inode->i_mode)) {
2017 if (IS_RDONLY(inode)) {
2021 if (!sb->s_op->quota_write || !sb->s_op->quota_read) {
2025 /* Usage always has to be set... */
2026 if (!(flags & DQUOT_USAGE_ENABLED)) {
2031 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2032 /* As we bypass the pagecache we must now flush the inode so
2033 * that we see all the changes from userspace... */
2034 write_inode_now(inode, 1);
2035 /* And now flush the block cache so that kernel sees the
2037 invalidate_bdev(sb->s_bdev);
2039 mutex_lock(&inode->i_mutex);
2040 mutex_lock(&dqopt->dqonoff_mutex);
2041 if (sb_has_quota_loaded(sb, type)) {
2046 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2047 /* We don't want quota and atime on quota files (deadlocks
2048 * possible) Also nobody should write to the file - we use
2049 * special IO operations which ignore the immutable bit. */
2050 down_write(&dqopt->dqptr_sem);
2051 oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE |
2053 inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
2054 up_write(&dqopt->dqptr_sem);
2055 sb->dq_op->drop(inode);
2059 dqopt->files[type] = igrab(inode);
2060 if (!dqopt->files[type])
2063 if (!fmt->qf_ops->check_quota_file(sb, type))
2066 dqopt->ops[type] = fmt->qf_ops;
2067 dqopt->info[type].dqi_format = fmt;
2068 dqopt->info[type].dqi_fmt_id = format_id;
2069 INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
2070 mutex_lock(&dqopt->dqio_mutex);
2071 error = dqopt->ops[type]->read_file_info(sb, type);
2073 mutex_unlock(&dqopt->dqio_mutex);
2076 mutex_unlock(&dqopt->dqio_mutex);
2077 mutex_unlock(&inode->i_mutex);
2078 spin_lock(&dq_state_lock);
2079 dqopt->flags |= dquot_state_flag(flags, type);
2080 spin_unlock(&dq_state_lock);
2082 add_dquot_ref(sb, type);
2083 mutex_unlock(&dqopt->dqonoff_mutex);
2088 dqopt->files[type] = NULL;
2091 mutex_unlock(&dqopt->dqonoff_mutex);
2092 if (oldflags != -1) {
2093 down_write(&dqopt->dqptr_sem);
2094 /* Set the flags back (in the case of accidental quotaon()
2095 * on a wrong file we don't want to mess up the flags) */
2096 inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
2097 inode->i_flags |= oldflags;
2098 up_write(&dqopt->dqptr_sem);
2100 mutex_unlock(&inode->i_mutex);
2102 put_quota_format(fmt);
2107 /* Reenable quotas on remount RW */
2108 static int vfs_quota_on_remount(struct super_block *sb, int type)
2110 struct quota_info *dqopt = sb_dqopt(sb);
2111 struct inode *inode;
2115 mutex_lock(&dqopt->dqonoff_mutex);
2116 if (!sb_has_quota_suspended(sb, type)) {
2117 mutex_unlock(&dqopt->dqonoff_mutex);
2120 inode = dqopt->files[type];
2121 dqopt->files[type] = NULL;
2122 spin_lock(&dq_state_lock);
2123 flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
2124 DQUOT_LIMITS_ENABLED, type);
2125 dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type);
2126 spin_unlock(&dq_state_lock);
2127 mutex_unlock(&dqopt->dqonoff_mutex);
2129 flags = dquot_generic_flag(flags, type);
2130 ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id,
2137 int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
2140 int error = security_quota_on(path->dentry);
2143 /* Quota file not on the same filesystem? */
2144 if (path->mnt->mnt_sb != sb)
2147 error = vfs_load_quota_inode(path->dentry->d_inode, type,
2148 format_id, DQUOT_USAGE_ENABLED |
2149 DQUOT_LIMITS_ENABLED);
2152 EXPORT_SYMBOL(vfs_quota_on_path);
2154 int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name,
2161 return vfs_quota_on_remount(sb, type);
2163 error = kern_path(name, LOOKUP_FOLLOW, &path);
2165 error = vfs_quota_on_path(sb, type, format_id, &path);
2170 EXPORT_SYMBOL(vfs_quota_on);
2173 * More powerful function for turning on quotas allowing setting
2174 * of individual quota flags
2176 int vfs_quota_enable(struct inode *inode, int type, int format_id,
2180 struct super_block *sb = inode->i_sb;
2181 struct quota_info *dqopt = sb_dqopt(sb);
2183 /* Just unsuspend quotas? */
2184 if (flags & DQUOT_SUSPENDED)
2185 return vfs_quota_on_remount(sb, type);
2188 /* Just updating flags needed? */
2189 if (sb_has_quota_loaded(sb, type)) {
2190 mutex_lock(&dqopt->dqonoff_mutex);
2191 /* Now do a reliable test... */
2192 if (!sb_has_quota_loaded(sb, type)) {
2193 mutex_unlock(&dqopt->dqonoff_mutex);
2196 if (flags & DQUOT_USAGE_ENABLED &&
2197 sb_has_quota_usage_enabled(sb, type)) {
2201 if (flags & DQUOT_LIMITS_ENABLED &&
2202 sb_has_quota_limits_enabled(sb, type)) {
2206 spin_lock(&dq_state_lock);
2207 sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
2208 spin_unlock(&dq_state_lock);
2210 mutex_unlock(&dqopt->dqonoff_mutex);
2215 return vfs_load_quota_inode(inode, type, format_id, flags);
2217 EXPORT_SYMBOL(vfs_quota_enable);
2220 * This function is used when filesystem needs to initialize quotas
2221 * during mount time.
2223 int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
2224 int format_id, int type)
2226 struct dentry *dentry;
2229 dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
2231 return PTR_ERR(dentry);
2233 if (!dentry->d_inode) {
2238 error = security_quota_on(dentry);
2240 error = vfs_load_quota_inode(dentry->d_inode, type, format_id,
2241 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
2247 EXPORT_SYMBOL(vfs_quota_on_mount);
2249 /* Wrapper to turn on quotas when remounting rw */
2250 int vfs_dq_quota_on_remount(struct super_block *sb)
2255 if (!sb->s_qcop || !sb->s_qcop->quota_on)
2257 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
2258 err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1);
2259 if (err < 0 && !ret)
2264 EXPORT_SYMBOL(vfs_dq_quota_on_remount);
2266 static inline qsize_t qbtos(qsize_t blocks)
2268 return blocks << QIF_DQBLKSIZE_BITS;
2271 static inline qsize_t stoqb(qsize_t space)
2273 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
2276 /* Generic routine for getting common part of quota structure */
2277 static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di)
2279 struct mem_dqblk *dm = &dquot->dq_dqb;
2281 spin_lock(&dq_data_lock);
2282 di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit);
2283 di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit);
2284 di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace;
2285 di->dqb_ihardlimit = dm->dqb_ihardlimit;
2286 di->dqb_isoftlimit = dm->dqb_isoftlimit;
2287 di->dqb_curinodes = dm->dqb_curinodes;
2288 di->dqb_btime = dm->dqb_btime;
2289 di->dqb_itime = dm->dqb_itime;
2290 di->dqb_valid = QIF_ALL;
2291 spin_unlock(&dq_data_lock);
2294 int vfs_get_dqblk(struct super_block *sb, int type, qid_t id,
2295 struct if_dqblk *di)
2297 struct dquot *dquot;
2299 dquot = dqget(sb, id, type);
2302 do_get_dqblk(dquot, di);
2307 EXPORT_SYMBOL(vfs_get_dqblk);
2309 /* Generic routine for setting common part of quota structure */
2310 static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
2312 struct mem_dqblk *dm = &dquot->dq_dqb;
2313 int check_blim = 0, check_ilim = 0;
2314 struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
2316 if ((di->dqb_valid & QIF_BLIMITS &&
2317 (di->dqb_bhardlimit > dqi->dqi_maxblimit ||
2318 di->dqb_bsoftlimit > dqi->dqi_maxblimit)) ||
2319 (di->dqb_valid & QIF_ILIMITS &&
2320 (di->dqb_ihardlimit > dqi->dqi_maxilimit ||
2321 di->dqb_isoftlimit > dqi->dqi_maxilimit)))
2324 spin_lock(&dq_data_lock);
2325 if (di->dqb_valid & QIF_SPACE) {
2326 dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace;
2328 __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
2330 if (di->dqb_valid & QIF_BLIMITS) {
2331 dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit);
2332 dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit);
2334 __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
2336 if (di->dqb_valid & QIF_INODES) {
2337 dm->dqb_curinodes = di->dqb_curinodes;
2339 __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
2341 if (di->dqb_valid & QIF_ILIMITS) {
2342 dm->dqb_isoftlimit = di->dqb_isoftlimit;
2343 dm->dqb_ihardlimit = di->dqb_ihardlimit;
2345 __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
2347 if (di->dqb_valid & QIF_BTIME) {
2348 dm->dqb_btime = di->dqb_btime;
2350 __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
2352 if (di->dqb_valid & QIF_ITIME) {
2353 dm->dqb_itime = di->dqb_itime;
2355 __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
2359 if (!dm->dqb_bsoftlimit ||
2360 dm->dqb_curspace < dm->dqb_bsoftlimit) {
2362 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
2363 } else if (!(di->dqb_valid & QIF_BTIME))
2364 /* Set grace only if user hasn't provided his own... */
2365 dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
2368 if (!dm->dqb_isoftlimit ||
2369 dm->dqb_curinodes < dm->dqb_isoftlimit) {
2371 clear_bit(DQ_INODES_B, &dquot->dq_flags);
2372 } else if (!(di->dqb_valid & QIF_ITIME))
2373 /* Set grace only if user hasn't provided his own... */
2374 dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
2376 if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit ||
2378 clear_bit(DQ_FAKE_B, &dquot->dq_flags);
2380 set_bit(DQ_FAKE_B, &dquot->dq_flags);
2381 spin_unlock(&dq_data_lock);
2382 mark_dquot_dirty(dquot);
2387 int vfs_set_dqblk(struct super_block *sb, int type, qid_t id,
2388 struct if_dqblk *di)
2390 struct dquot *dquot;
2393 dquot = dqget(sb, id, type);
2398 rc = do_set_dqblk(dquot, di);
2403 EXPORT_SYMBOL(vfs_set_dqblk);
2405 /* Generic routine for getting common part of quota file information */
2406 int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2408 struct mem_dqinfo *mi;
2410 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2411 if (!sb_has_quota_active(sb, type)) {
2412 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2415 mi = sb_dqopt(sb)->info + type;
2416 spin_lock(&dq_data_lock);
2417 ii->dqi_bgrace = mi->dqi_bgrace;
2418 ii->dqi_igrace = mi->dqi_igrace;
2419 ii->dqi_flags = mi->dqi_flags & DQF_MASK;
2420 ii->dqi_valid = IIF_ALL;
2421 spin_unlock(&dq_data_lock);
2422 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2425 EXPORT_SYMBOL(vfs_get_dqinfo);
2427 /* Generic routine for setting common part of quota file information */
2428 int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2430 struct mem_dqinfo *mi;
2433 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2434 if (!sb_has_quota_active(sb, type)) {
2438 mi = sb_dqopt(sb)->info + type;
2439 spin_lock(&dq_data_lock);
2440 if (ii->dqi_valid & IIF_BGRACE)
2441 mi->dqi_bgrace = ii->dqi_bgrace;
2442 if (ii->dqi_valid & IIF_IGRACE)
2443 mi->dqi_igrace = ii->dqi_igrace;
2444 if (ii->dqi_valid & IIF_FLAGS)
2445 mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) |
2446 (ii->dqi_flags & DQF_MASK);
2447 spin_unlock(&dq_data_lock);
2448 mark_info_dirty(sb, type);
2449 /* Force write to disk */
2450 sb->dq_op->write_info(sb, type);
2452 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2455 EXPORT_SYMBOL(vfs_set_dqinfo);
2457 struct quotactl_ops vfs_quotactl_ops = {
2458 .quota_on = vfs_quota_on,
2459 .quota_off = vfs_quota_off,
2460 .quota_sync = vfs_quota_sync,
2461 .get_info = vfs_get_dqinfo,
2462 .set_info = vfs_set_dqinfo,
2463 .get_dqblk = vfs_get_dqblk,
2464 .set_dqblk = vfs_set_dqblk
2467 static ctl_table fs_dqstats_table[] = {
2469 .ctl_name = FS_DQ_LOOKUPS,
2470 .procname = "lookups",
2471 .data = &dqstats.lookups,
2472 .maxlen = sizeof(int),
2474 .proc_handler = &proc_dointvec,
2477 .ctl_name = FS_DQ_DROPS,
2478 .procname = "drops",
2479 .data = &dqstats.drops,
2480 .maxlen = sizeof(int),
2482 .proc_handler = &proc_dointvec,
2485 .ctl_name = FS_DQ_READS,
2486 .procname = "reads",
2487 .data = &dqstats.reads,
2488 .maxlen = sizeof(int),
2490 .proc_handler = &proc_dointvec,
2493 .ctl_name = FS_DQ_WRITES,
2494 .procname = "writes",
2495 .data = &dqstats.writes,
2496 .maxlen = sizeof(int),
2498 .proc_handler = &proc_dointvec,
2501 .ctl_name = FS_DQ_CACHE_HITS,
2502 .procname = "cache_hits",
2503 .data = &dqstats.cache_hits,
2504 .maxlen = sizeof(int),
2506 .proc_handler = &proc_dointvec,
2509 .ctl_name = FS_DQ_ALLOCATED,
2510 .procname = "allocated_dquots",
2511 .data = &dqstats.allocated_dquots,
2512 .maxlen = sizeof(int),
2514 .proc_handler = &proc_dointvec,
2517 .ctl_name = FS_DQ_FREE,
2518 .procname = "free_dquots",
2519 .data = &dqstats.free_dquots,
2520 .maxlen = sizeof(int),
2522 .proc_handler = &proc_dointvec,
2525 .ctl_name = FS_DQ_SYNCS,
2526 .procname = "syncs",
2527 .data = &dqstats.syncs,
2528 .maxlen = sizeof(int),
2530 .proc_handler = &proc_dointvec,
2532 #ifdef CONFIG_PRINT_QUOTA_WARNING
2534 .ctl_name = FS_DQ_WARNINGS,
2535 .procname = "warnings",
2536 .data = &flag_print_warnings,
2537 .maxlen = sizeof(int),
2539 .proc_handler = &proc_dointvec,
2545 static ctl_table fs_table[] = {
2547 .ctl_name = FS_DQSTATS,
2548 .procname = "quota",
2550 .child = fs_dqstats_table,
2555 static ctl_table sys_table[] = {
2565 static int __init dquot_init(void)
2568 unsigned long nr_hash, order;
2570 printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
2572 register_sysctl_table(sys_table);
2574 dquot_cachep = kmem_cache_create("dquot",
2575 sizeof(struct dquot), sizeof(unsigned long) * 4,
2576 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
2577 SLAB_MEM_SPREAD|SLAB_PANIC),
2581 dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
2583 panic("Cannot create dquot hash table");
2585 /* Find power-of-two hlist_heads which can fit into allocation */
2586 nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
2590 } while (nr_hash >> dq_hash_bits);
2593 nr_hash = 1UL << dq_hash_bits;
2594 dq_hash_mask = nr_hash - 1;
2595 for (i = 0; i < nr_hash; i++)
2596 INIT_HLIST_HEAD(dquot_hash + i);
2598 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2599 nr_hash, order, (PAGE_SIZE << order));
2601 register_shrinker(&dqcache_shrinker);
2603 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
2604 if (genl_register_family("a_genl_family) != 0)
2606 "VFS: Failed to create quota netlink interface.\n");
2611 module_init(dquot_init);