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 DEFINE_SPINLOCK(dq_list_lock);
133 static DEFINE_SPINLOCK(dq_state_lock);
134 DEFINE_SPINLOCK(dq_data_lock);
136 static char *quotatypes[] = INITQFNAMES;
137 static struct quota_format_type *quota_formats; /* List of registered formats */
138 static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES;
140 /* SLAB cache for dquot structures */
141 static struct kmem_cache *dquot_cachep;
143 int register_quota_format(struct quota_format_type *fmt)
145 spin_lock(&dq_list_lock);
146 fmt->qf_next = quota_formats;
148 spin_unlock(&dq_list_lock);
152 void unregister_quota_format(struct quota_format_type *fmt)
154 struct quota_format_type **actqf;
156 spin_lock(&dq_list_lock);
157 for (actqf = "a_formats; *actqf && *actqf != fmt; actqf = &(*actqf)->qf_next);
159 *actqf = (*actqf)->qf_next;
160 spin_unlock(&dq_list_lock);
163 static struct quota_format_type *find_quota_format(int id)
165 struct quota_format_type *actqf;
167 spin_lock(&dq_list_lock);
168 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
169 if (!actqf || !try_module_get(actqf->qf_owner)) {
172 spin_unlock(&dq_list_lock);
174 for (qm = 0; module_names[qm].qm_fmt_id && module_names[qm].qm_fmt_id != id; qm++);
175 if (!module_names[qm].qm_fmt_id || request_module(module_names[qm].qm_mod_name))
178 spin_lock(&dq_list_lock);
179 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
180 if (actqf && !try_module_get(actqf->qf_owner))
183 spin_unlock(&dq_list_lock);
187 static void put_quota_format(struct quota_format_type *fmt)
189 module_put(fmt->qf_owner);
193 * Dquot List Management:
194 * The quota code uses three lists for dquot management: the inuse_list,
195 * free_dquots, and dquot_hash[] array. A single dquot structure may be
196 * on all three lists, depending on its current state.
198 * All dquots are placed to the end of inuse_list when first created, and this
199 * list is used for invalidate operation, which must look at every dquot.
201 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
202 * and this list is searched whenever we need an available dquot. Dquots are
203 * removed from the list as soon as they are used again, and
204 * dqstats.free_dquots gives the number of dquots on the list. When
205 * dquot is invalidated it's completely released from memory.
207 * Dquots with a specific identity (device, type and id) are placed on
208 * one of the dquot_hash[] hash chains. The provides an efficient search
209 * mechanism to locate a specific dquot.
212 static LIST_HEAD(inuse_list);
213 static LIST_HEAD(free_dquots);
214 static unsigned int dq_hash_bits, dq_hash_mask;
215 static struct hlist_head *dquot_hash;
217 struct dqstats dqstats;
219 static inline unsigned int
220 hashfn(const struct super_block *sb, unsigned int id, int type)
224 tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
225 return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
229 * Following list functions expect dq_list_lock to be held
231 static inline void insert_dquot_hash(struct dquot *dquot)
233 struct hlist_head *head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type);
234 hlist_add_head(&dquot->dq_hash, head);
237 static inline void remove_dquot_hash(struct dquot *dquot)
239 hlist_del_init(&dquot->dq_hash);
242 static inline struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, unsigned int id, int type)
244 struct hlist_node *node;
247 hlist_for_each (node, dquot_hash+hashent) {
248 dquot = hlist_entry(node, struct dquot, dq_hash);
249 if (dquot->dq_sb == sb && dquot->dq_id == id && dquot->dq_type == type)
255 /* Add a dquot to the tail of the free list */
256 static inline void put_dquot_last(struct dquot *dquot)
258 list_add_tail(&dquot->dq_free, &free_dquots);
259 dqstats.free_dquots++;
262 static inline void remove_free_dquot(struct dquot *dquot)
264 if (list_empty(&dquot->dq_free))
266 list_del_init(&dquot->dq_free);
267 dqstats.free_dquots--;
270 static inline void put_inuse(struct dquot *dquot)
272 /* We add to the back of inuse list so we don't have to restart
273 * when traversing this list and we block */
274 list_add_tail(&dquot->dq_inuse, &inuse_list);
275 dqstats.allocated_dquots++;
278 static inline void remove_inuse(struct dquot *dquot)
280 dqstats.allocated_dquots--;
281 list_del(&dquot->dq_inuse);
284 * End of list functions needing dq_list_lock
287 static void wait_on_dquot(struct dquot *dquot)
289 mutex_lock(&dquot->dq_lock);
290 mutex_unlock(&dquot->dq_lock);
293 static inline int dquot_dirty(struct dquot *dquot)
295 return test_bit(DQ_MOD_B, &dquot->dq_flags);
298 static inline int mark_dquot_dirty(struct dquot *dquot)
300 return dquot->dq_sb->dq_op->mark_dirty(dquot);
303 int dquot_mark_dquot_dirty(struct dquot *dquot)
305 spin_lock(&dq_list_lock);
306 if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags))
307 list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
308 info[dquot->dq_type].dqi_dirty_list);
309 spin_unlock(&dq_list_lock);
313 /* This function needs dq_list_lock */
314 static inline int clear_dquot_dirty(struct dquot *dquot)
316 if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
318 list_del_init(&dquot->dq_dirty);
322 void mark_info_dirty(struct super_block *sb, int type)
324 set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
326 EXPORT_SYMBOL(mark_info_dirty);
329 * Read dquot from disk and alloc space for it
332 int dquot_acquire(struct dquot *dquot)
334 int ret = 0, ret2 = 0;
335 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
337 mutex_lock(&dquot->dq_lock);
338 mutex_lock(&dqopt->dqio_mutex);
339 if (!test_bit(DQ_READ_B, &dquot->dq_flags))
340 ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
343 set_bit(DQ_READ_B, &dquot->dq_flags);
344 /* Instantiate dquot if needed */
345 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
346 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
347 /* Write the info if needed */
348 if (info_dirty(&dqopt->info[dquot->dq_type]))
349 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
357 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
359 mutex_unlock(&dqopt->dqio_mutex);
360 mutex_unlock(&dquot->dq_lock);
365 * Write dquot to disk
367 int dquot_commit(struct dquot *dquot)
369 int ret = 0, ret2 = 0;
370 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
372 mutex_lock(&dqopt->dqio_mutex);
373 spin_lock(&dq_list_lock);
374 if (!clear_dquot_dirty(dquot)) {
375 spin_unlock(&dq_list_lock);
378 spin_unlock(&dq_list_lock);
379 /* Inactive dquot can be only if there was error during read/init
380 * => we have better not writing it */
381 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
382 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
383 if (info_dirty(&dqopt->info[dquot->dq_type]))
384 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
389 mutex_unlock(&dqopt->dqio_mutex);
396 int dquot_release(struct dquot *dquot)
398 int ret = 0, ret2 = 0;
399 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
401 mutex_lock(&dquot->dq_lock);
402 /* Check whether we are not racing with some other dqget() */
403 if (atomic_read(&dquot->dq_count) > 1)
405 mutex_lock(&dqopt->dqio_mutex);
406 if (dqopt->ops[dquot->dq_type]->release_dqblk) {
407 ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
409 if (info_dirty(&dqopt->info[dquot->dq_type]))
410 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
414 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
415 mutex_unlock(&dqopt->dqio_mutex);
417 mutex_unlock(&dquot->dq_lock);
421 void dquot_destroy(struct dquot *dquot)
423 kmem_cache_free(dquot_cachep, dquot);
425 EXPORT_SYMBOL(dquot_destroy);
427 static inline void do_destroy_dquot(struct dquot *dquot)
429 dquot->dq_sb->dq_op->destroy_dquot(dquot);
432 /* Invalidate all dquots on the list. Note that this function is called after
433 * quota is disabled and pointers from inodes removed so there cannot be new
434 * quota users. There can still be some users of quotas due to inodes being
435 * just deleted or pruned by prune_icache() (those are not attached to any
436 * list) or parallel quotactl call. We have to wait for such users.
438 static void invalidate_dquots(struct super_block *sb, int type)
440 struct dquot *dquot, *tmp;
443 spin_lock(&dq_list_lock);
444 list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
445 if (dquot->dq_sb != sb)
447 if (dquot->dq_type != type)
449 /* Wait for dquot users */
450 if (atomic_read(&dquot->dq_count)) {
453 atomic_inc(&dquot->dq_count);
454 prepare_to_wait(&dquot->dq_wait_unused, &wait,
455 TASK_UNINTERRUPTIBLE);
456 spin_unlock(&dq_list_lock);
457 /* Once dqput() wakes us up, we know it's time to free
459 * IMPORTANT: we rely on the fact that there is always
460 * at most one process waiting for dquot to free.
461 * Otherwise dq_count would be > 1 and we would never
464 if (atomic_read(&dquot->dq_count) > 1)
466 finish_wait(&dquot->dq_wait_unused, &wait);
468 /* At this moment dquot() need not exist (it could be
469 * reclaimed by prune_dqcache(). Hence we must
474 * Quota now has no users and it has been written on last
477 remove_dquot_hash(dquot);
478 remove_free_dquot(dquot);
480 do_destroy_dquot(dquot);
482 spin_unlock(&dq_list_lock);
485 /* Call callback for every active dquot on given filesystem */
486 int dquot_scan_active(struct super_block *sb,
487 int (*fn)(struct dquot *dquot, unsigned long priv),
490 struct dquot *dquot, *old_dquot = NULL;
493 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
494 spin_lock(&dq_list_lock);
495 list_for_each_entry(dquot, &inuse_list, dq_inuse) {
496 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
498 if (dquot->dq_sb != sb)
500 /* Now we have active dquot so we can just increase use count */
501 atomic_inc(&dquot->dq_count);
503 spin_unlock(&dq_list_lock);
506 ret = fn(dquot, priv);
509 spin_lock(&dq_list_lock);
510 /* We are safe to continue now because our dquot could not
511 * be moved out of the inuse list while we hold the reference */
513 spin_unlock(&dq_list_lock);
516 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
520 int vfs_quota_sync(struct super_block *sb, int type)
522 struct list_head *dirty;
524 struct quota_info *dqopt = sb_dqopt(sb);
527 mutex_lock(&dqopt->dqonoff_mutex);
528 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
529 if (type != -1 && cnt != type)
531 if (!sb_has_quota_active(sb, cnt))
533 spin_lock(&dq_list_lock);
534 dirty = &dqopt->info[cnt].dqi_dirty_list;
535 while (!list_empty(dirty)) {
536 dquot = list_first_entry(dirty, struct dquot, dq_dirty);
537 /* Dirty and inactive can be only bad dquot... */
538 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
539 clear_dquot_dirty(dquot);
542 /* Now we have active dquot from which someone is
543 * holding reference so we can safely just increase
545 atomic_inc(&dquot->dq_count);
547 spin_unlock(&dq_list_lock);
548 sb->dq_op->write_dquot(dquot);
550 spin_lock(&dq_list_lock);
552 spin_unlock(&dq_list_lock);
555 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
556 if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt)
557 && info_dirty(&dqopt->info[cnt]))
558 sb->dq_op->write_info(sb, cnt);
559 spin_lock(&dq_list_lock);
561 spin_unlock(&dq_list_lock);
562 mutex_unlock(&dqopt->dqonoff_mutex);
567 /* Free unused dquots from cache */
568 static void prune_dqcache(int count)
570 struct list_head *head;
573 head = free_dquots.prev;
574 while (head != &free_dquots && count) {
575 dquot = list_entry(head, struct dquot, dq_free);
576 remove_dquot_hash(dquot);
577 remove_free_dquot(dquot);
579 do_destroy_dquot(dquot);
581 head = free_dquots.prev;
586 * This is called from kswapd when we think we need some
590 static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
593 spin_lock(&dq_list_lock);
595 spin_unlock(&dq_list_lock);
597 return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure;
600 static struct shrinker dqcache_shrinker = {
601 .shrink = shrink_dqcache_memory,
602 .seeks = DEFAULT_SEEKS,
606 * Put reference to dquot
607 * NOTE: If you change this function please check whether dqput_blocks() works right...
609 void dqput(struct dquot *dquot)
615 #ifdef __DQUOT_PARANOIA
616 if (!atomic_read(&dquot->dq_count)) {
617 printk("VFS: dqput: trying to free free dquot\n");
618 printk("VFS: device %s, dquot of %s %d\n",
620 quotatypes[dquot->dq_type],
626 spin_lock(&dq_list_lock);
628 spin_unlock(&dq_list_lock);
630 spin_lock(&dq_list_lock);
631 if (atomic_read(&dquot->dq_count) > 1) {
632 /* We have more than one user... nothing to do */
633 atomic_dec(&dquot->dq_count);
634 /* Releasing dquot during quotaoff phase? */
635 if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_type) &&
636 atomic_read(&dquot->dq_count) == 1)
637 wake_up(&dquot->dq_wait_unused);
638 spin_unlock(&dq_list_lock);
641 /* Need to release dquot? */
642 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
643 spin_unlock(&dq_list_lock);
644 /* Commit dquot before releasing */
645 ret = dquot->dq_sb->dq_op->write_dquot(dquot);
647 printk(KERN_ERR "VFS: cannot write quota structure on "
648 "device %s (error %d). Quota may get out of "
649 "sync!\n", dquot->dq_sb->s_id, ret);
651 * We clear dirty bit anyway, so that we avoid
654 spin_lock(&dq_list_lock);
655 clear_dquot_dirty(dquot);
656 spin_unlock(&dq_list_lock);
660 /* Clear flag in case dquot was inactive (something bad happened) */
661 clear_dquot_dirty(dquot);
662 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
663 spin_unlock(&dq_list_lock);
664 dquot->dq_sb->dq_op->release_dquot(dquot);
667 atomic_dec(&dquot->dq_count);
668 #ifdef __DQUOT_PARANOIA
670 BUG_ON(!list_empty(&dquot->dq_free));
672 put_dquot_last(dquot);
673 spin_unlock(&dq_list_lock);
676 struct dquot *dquot_alloc(struct super_block *sb, int type)
678 return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
680 EXPORT_SYMBOL(dquot_alloc);
682 static struct dquot *get_empty_dquot(struct super_block *sb, int type)
686 dquot = sb->dq_op->alloc_dquot(sb, type);
690 mutex_init(&dquot->dq_lock);
691 INIT_LIST_HEAD(&dquot->dq_free);
692 INIT_LIST_HEAD(&dquot->dq_inuse);
693 INIT_HLIST_NODE(&dquot->dq_hash);
694 INIT_LIST_HEAD(&dquot->dq_dirty);
695 init_waitqueue_head(&dquot->dq_wait_unused);
697 dquot->dq_type = type;
698 atomic_set(&dquot->dq_count, 1);
704 * Get reference to dquot
706 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
707 * destroying our dquot by:
708 * a) checking for quota flags under dq_list_lock and
709 * b) getting a reference to dquot before we release dq_list_lock
711 struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
713 unsigned int hashent = hashfn(sb, id, type);
714 struct dquot *dquot = NODQUOT, *empty = NODQUOT;
716 if (!sb_has_quota_active(sb, type))
719 spin_lock(&dq_list_lock);
720 spin_lock(&dq_state_lock);
721 if (!sb_has_quota_active(sb, type)) {
722 spin_unlock(&dq_state_lock);
723 spin_unlock(&dq_list_lock);
726 spin_unlock(&dq_state_lock);
728 if ((dquot = find_dquot(hashent, sb, id, type)) == NODQUOT) {
729 if (empty == NODQUOT) {
730 spin_unlock(&dq_list_lock);
731 if ((empty = get_empty_dquot(sb, type)) == NODQUOT)
732 schedule(); /* Try to wait for a moment... */
738 /* all dquots go on the inuse_list */
740 /* hash it first so it can be found */
741 insert_dquot_hash(dquot);
743 spin_unlock(&dq_list_lock);
745 if (!atomic_read(&dquot->dq_count))
746 remove_free_dquot(dquot);
747 atomic_inc(&dquot->dq_count);
748 dqstats.cache_hits++;
750 spin_unlock(&dq_list_lock);
752 /* Wait for dq_lock - after this we know that either dquot_release() is already
753 * finished or it will be canceled due to dq_count > 1 test */
754 wait_on_dquot(dquot);
755 /* Read the dquot and instantiate it (everything done only if needed) */
756 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && sb->dq_op->acquire_dquot(dquot) < 0) {
761 #ifdef __DQUOT_PARANOIA
762 BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
766 do_destroy_dquot(empty);
771 static int dqinit_needed(struct inode *inode, int type)
775 if (IS_NOQUOTA(inode))
778 return inode->i_dquot[type] == NODQUOT;
779 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
780 if (inode->i_dquot[cnt] == NODQUOT)
785 /* This routine is guarded by dqonoff_mutex mutex */
786 static void add_dquot_ref(struct super_block *sb, int type)
788 struct inode *inode, *old_inode = NULL;
790 spin_lock(&inode_lock);
791 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
792 if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW))
794 if (!atomic_read(&inode->i_writecount))
796 if (!dqinit_needed(inode, type))
800 spin_unlock(&inode_lock);
803 sb->dq_op->initialize(inode, type);
804 /* We hold a reference to 'inode' so it couldn't have been
805 * removed from s_inodes list while we dropped the inode_lock.
806 * We cannot iput the inode now as we can be holding the last
807 * reference and we cannot iput it under inode_lock. So we
808 * keep the reference and iput it later. */
810 spin_lock(&inode_lock);
812 spin_unlock(&inode_lock);
816 /* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */
817 static inline int dqput_blocks(struct dquot *dquot)
819 if (atomic_read(&dquot->dq_count) <= 1)
824 /* Remove references to dquots from inode - add dquot to list for freeing if needed */
825 /* We can't race with anybody because we hold dqptr_sem for writing... */
826 static int remove_inode_dquot_ref(struct inode *inode, int type,
827 struct list_head *tofree_head)
829 struct dquot *dquot = inode->i_dquot[type];
831 inode->i_dquot[type] = NODQUOT;
832 if (dquot != NODQUOT) {
833 if (dqput_blocks(dquot)) {
834 #ifdef __DQUOT_PARANOIA
835 if (atomic_read(&dquot->dq_count) != 1)
836 printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count));
838 spin_lock(&dq_list_lock);
839 list_add(&dquot->dq_free, tofree_head); /* As dquot must have currently users it can't be on the free list... */
840 spin_unlock(&dq_list_lock);
844 dqput(dquot); /* We have guaranteed we won't block */
849 /* Free list of dquots - called from inode.c */
850 /* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */
851 static void put_dquot_list(struct list_head *tofree_head)
853 struct list_head *act_head;
856 act_head = tofree_head->next;
857 /* So now we have dquots on the list... Just free them */
858 while (act_head != tofree_head) {
859 dquot = list_entry(act_head, struct dquot, dq_free);
860 act_head = act_head->next;
861 list_del_init(&dquot->dq_free); /* Remove dquot from the list so we won't have problems... */
866 static void remove_dquot_ref(struct super_block *sb, int type,
867 struct list_head *tofree_head)
871 spin_lock(&inode_lock);
872 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
874 * We have to scan also I_NEW inodes because they can already
875 * have quota pointer initialized. Luckily, we need to touch
876 * only quota pointers and these have separate locking
879 if (!IS_NOQUOTA(inode))
880 remove_inode_dquot_ref(inode, type, tofree_head);
882 spin_unlock(&inode_lock);
885 /* Gather all references from inodes and drop them */
886 static void drop_dquot_ref(struct super_block *sb, int type)
888 LIST_HEAD(tofree_head);
891 down_write(&sb_dqopt(sb)->dqptr_sem);
892 remove_dquot_ref(sb, type, &tofree_head);
893 up_write(&sb_dqopt(sb)->dqptr_sem);
894 put_dquot_list(&tofree_head);
898 static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
900 dquot->dq_dqb.dqb_curinodes += number;
903 static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
905 dquot->dq_dqb.dqb_curspace += number;
908 static inline void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
910 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
911 dquot->dq_dqb.dqb_curinodes >= number)
912 dquot->dq_dqb.dqb_curinodes -= number;
914 dquot->dq_dqb.dqb_curinodes = 0;
915 if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
916 dquot->dq_dqb.dqb_itime = (time_t) 0;
917 clear_bit(DQ_INODES_B, &dquot->dq_flags);
920 static inline void dquot_decr_space(struct dquot *dquot, qsize_t number)
922 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
923 dquot->dq_dqb.dqb_curspace >= number)
924 dquot->dq_dqb.dqb_curspace -= number;
926 dquot->dq_dqb.dqb_curspace = 0;
927 if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
928 dquot->dq_dqb.dqb_btime = (time_t) 0;
929 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
932 static int warning_issued(struct dquot *dquot, const int warntype)
934 int flag = (warntype == QUOTA_NL_BHARDWARN ||
935 warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
936 ((warntype == QUOTA_NL_IHARDWARN ||
937 warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
941 return test_and_set_bit(flag, &dquot->dq_flags);
944 #ifdef CONFIG_PRINT_QUOTA_WARNING
945 static int flag_print_warnings = 1;
947 static inline int need_print_warning(struct dquot *dquot)
949 if (!flag_print_warnings)
952 switch (dquot->dq_type) {
954 return current_fsuid() == dquot->dq_id;
956 return in_group_p(dquot->dq_id);
961 /* Print warning to user which exceeded quota */
962 static void print_warning(struct dquot *dquot, const int warntype)
965 struct tty_struct *tty;
967 if (warntype == QUOTA_NL_IHARDBELOW ||
968 warntype == QUOTA_NL_ISOFTBELOW ||
969 warntype == QUOTA_NL_BHARDBELOW ||
970 warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot))
973 tty = get_current_tty();
976 tty_write_message(tty, dquot->dq_sb->s_id);
977 if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
978 tty_write_message(tty, ": warning, ");
980 tty_write_message(tty, ": write failed, ");
981 tty_write_message(tty, quotatypes[dquot->dq_type]);
983 case QUOTA_NL_IHARDWARN:
984 msg = " file limit reached.\r\n";
986 case QUOTA_NL_ISOFTLONGWARN:
987 msg = " file quota exceeded too long.\r\n";
989 case QUOTA_NL_ISOFTWARN:
990 msg = " file quota exceeded.\r\n";
992 case QUOTA_NL_BHARDWARN:
993 msg = " block limit reached.\r\n";
995 case QUOTA_NL_BSOFTLONGWARN:
996 msg = " block quota exceeded too long.\r\n";
998 case QUOTA_NL_BSOFTWARN:
999 msg = " block quota exceeded.\r\n";
1002 tty_write_message(tty, msg);
1007 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
1009 /* Netlink family structure for quota */
1010 static struct genl_family quota_genl_family = {
1011 .id = GENL_ID_GENERATE,
1013 .name = "VFS_DQUOT",
1015 .maxattr = QUOTA_NL_A_MAX,
1018 /* Send warning to userspace about user which exceeded quota */
1019 static void send_warning(const struct dquot *dquot, const char warntype)
1021 static atomic_t seq;
1022 struct sk_buff *skb;
1025 int msg_size = 4 * nla_total_size(sizeof(u32)) +
1026 2 * nla_total_size(sizeof(u64));
1028 /* We have to allocate using GFP_NOFS as we are called from a
1029 * filesystem performing write and thus further recursion into
1030 * the fs to free some data could cause deadlocks. */
1031 skb = genlmsg_new(msg_size, GFP_NOFS);
1034 "VFS: Not enough memory to send quota warning.\n");
1037 msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq),
1038 "a_genl_family, 0, QUOTA_NL_C_WARNING);
1041 "VFS: Cannot store netlink header in quota warning.\n");
1044 ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, dquot->dq_type);
1047 ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, dquot->dq_id);
1050 ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype);
1053 ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR,
1054 MAJOR(dquot->dq_sb->s_dev));
1057 ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR,
1058 MINOR(dquot->dq_sb->s_dev));
1061 ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current_uid());
1064 genlmsg_end(skb, msg_head);
1066 ret = genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS);
1067 if (ret < 0 && ret != -ESRCH)
1069 "VFS: Failed to send notification message: %d\n", ret);
1072 printk(KERN_ERR "VFS: Not enough space to compose quota message!\n");
1078 static inline void flush_warnings(struct dquot * const *dquots, char *warntype)
1082 for (i = 0; i < MAXQUOTAS; i++)
1083 if (dquots[i] != NODQUOT && warntype[i] != QUOTA_NL_NOWARN &&
1084 !warning_issued(dquots[i], warntype[i])) {
1085 #ifdef CONFIG_PRINT_QUOTA_WARNING
1086 print_warning(dquots[i], warntype[i]);
1088 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
1089 send_warning(dquots[i], warntype[i]);
1094 static inline char ignore_hardlimit(struct dquot *dquot)
1096 struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
1098 return capable(CAP_SYS_RESOURCE) &&
1099 (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || !(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 *warntype = QUOTA_NL_NOWARN;
1106 if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
1107 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1110 if (dquot->dq_dqb.dqb_ihardlimit &&
1111 (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_ihardlimit &&
1112 !ignore_hardlimit(dquot)) {
1113 *warntype = QUOTA_NL_IHARDWARN;
1117 if (dquot->dq_dqb.dqb_isoftlimit &&
1118 (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit &&
1119 dquot->dq_dqb.dqb_itime && get_seconds() >= dquot->dq_dqb.dqb_itime &&
1120 !ignore_hardlimit(dquot)) {
1121 *warntype = QUOTA_NL_ISOFTLONGWARN;
1125 if (dquot->dq_dqb.dqb_isoftlimit &&
1126 (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit &&
1127 dquot->dq_dqb.dqb_itime == 0) {
1128 *warntype = QUOTA_NL_ISOFTWARN;
1129 dquot->dq_dqb.dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
1135 /* needs dq_data_lock */
1136 static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype)
1138 *warntype = QUOTA_NL_NOWARN;
1139 if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
1140 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1143 if (dquot->dq_dqb.dqb_bhardlimit &&
1144 dquot->dq_dqb.dqb_curspace + space > dquot->dq_dqb.dqb_bhardlimit &&
1145 !ignore_hardlimit(dquot)) {
1147 *warntype = QUOTA_NL_BHARDWARN;
1151 if (dquot->dq_dqb.dqb_bsoftlimit &&
1152 dquot->dq_dqb.dqb_curspace + space > dquot->dq_dqb.dqb_bsoftlimit &&
1153 dquot->dq_dqb.dqb_btime && get_seconds() >= dquot->dq_dqb.dqb_btime &&
1154 !ignore_hardlimit(dquot)) {
1156 *warntype = QUOTA_NL_BSOFTLONGWARN;
1160 if (dquot->dq_dqb.dqb_bsoftlimit &&
1161 dquot->dq_dqb.dqb_curspace + space > dquot->dq_dqb.dqb_bsoftlimit &&
1162 dquot->dq_dqb.dqb_btime == 0) {
1164 *warntype = QUOTA_NL_BSOFTWARN;
1165 dquot->dq_dqb.dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace;
1169 * We don't allow preallocation to exceed softlimit so exceeding will
1178 static int info_idq_free(struct dquot *dquot, qsize_t inodes)
1180 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1181 dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit ||
1182 !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type))
1183 return QUOTA_NL_NOWARN;
1185 if (dquot->dq_dqb.dqb_curinodes - inodes <= dquot->dq_dqb.dqb_isoftlimit)
1186 return QUOTA_NL_ISOFTBELOW;
1187 if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
1188 dquot->dq_dqb.dqb_curinodes - inodes < dquot->dq_dqb.dqb_ihardlimit)
1189 return QUOTA_NL_IHARDBELOW;
1190 return QUOTA_NL_NOWARN;
1193 static int info_bdq_free(struct dquot *dquot, qsize_t space)
1195 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1196 dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
1197 return QUOTA_NL_NOWARN;
1199 if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit)
1200 return QUOTA_NL_BSOFTBELOW;
1201 if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit &&
1202 dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit)
1203 return QUOTA_NL_BHARDBELOW;
1204 return QUOTA_NL_NOWARN;
1207 * Initialize quota pointers in inode
1208 * We do things in a bit complicated way but by that we avoid calling
1209 * dqget() and thus filesystem callbacks under dqptr_sem.
1211 int dquot_initialize(struct inode *inode, int type)
1213 unsigned int id = 0;
1215 struct dquot *got[MAXQUOTAS] = { NODQUOT, NODQUOT };
1216 struct super_block *sb = inode->i_sb;
1218 /* First test before acquiring mutex - solves deadlocks when we
1219 * re-enter the quota code and are already holding the mutex */
1220 if (IS_NOQUOTA(inode))
1223 /* First get references to structures we might need. */
1224 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1225 if (type != -1 && cnt != type)
1235 got[cnt] = dqget(sb, id, cnt);
1238 down_write(&sb_dqopt(sb)->dqptr_sem);
1239 /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
1240 if (IS_NOQUOTA(inode))
1242 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1243 if (type != -1 && cnt != type)
1245 /* Avoid races with quotaoff() */
1246 if (!sb_has_quota_active(sb, cnt))
1248 if (inode->i_dquot[cnt] == NODQUOT) {
1249 inode->i_dquot[cnt] = got[cnt];
1254 up_write(&sb_dqopt(sb)->dqptr_sem);
1255 /* Drop unused references */
1256 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1262 * Release all quotas referenced by inode
1264 int dquot_drop(struct inode *inode)
1267 struct dquot *put[MAXQUOTAS];
1269 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1270 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1271 put[cnt] = inode->i_dquot[cnt];
1272 inode->i_dquot[cnt] = NODQUOT;
1274 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1276 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1281 /* Wrapper to remove references to quota structures from inode */
1282 void vfs_dq_drop(struct inode *inode)
1284 /* Here we can get arbitrary inode from clear_inode() so we have
1285 * to be careful. OTOH we don't need locking as quota operations
1286 * are allowed to change only at mount time */
1287 if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op
1288 && inode->i_sb->dq_op->drop) {
1290 /* Test before calling to rule out calls from proc and such
1291 * where we are not allowed to block. Note that this is
1292 * actually reliable test even without the lock - the caller
1293 * must assure that nobody can come after the DQUOT_DROP and
1294 * add quota pointers back anyway */
1295 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1296 if (inode->i_dquot[cnt] != NODQUOT)
1298 if (cnt < MAXQUOTAS)
1299 inode->i_sb->dq_op->drop(inode);
1304 * Following four functions update i_blocks+i_bytes fields and
1305 * quota information (together with appropriate checks)
1306 * NOTE: We absolutely rely on the fact that caller dirties
1307 * the inode (usually macros in quotaops.h care about this) and
1308 * holds a handle for the current transaction so that dquot write and
1309 * inode write go into the same transaction.
1313 * This operation can block, but only after everything is updated
1315 int dquot_alloc_space(struct inode *inode, qsize_t number, int warn)
1317 int cnt, ret = NO_QUOTA;
1318 char warntype[MAXQUOTAS];
1320 /* First test before acquiring mutex - solves deadlocks when we
1321 * re-enter the quota code and are already holding the mutex */
1322 if (IS_NOQUOTA(inode)) {
1324 inode_add_bytes(inode, number);
1327 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1328 warntype[cnt] = QUOTA_NL_NOWARN;
1330 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1331 if (IS_NOQUOTA(inode)) { /* Now we can do reliable test... */
1332 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1335 spin_lock(&dq_data_lock);
1336 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1337 if (inode->i_dquot[cnt] == NODQUOT)
1339 if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) == NO_QUOTA)
1342 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1343 if (inode->i_dquot[cnt] == NODQUOT)
1345 dquot_incr_space(inode->i_dquot[cnt], number);
1347 inode_add_bytes(inode, number);
1350 spin_unlock(&dq_data_lock);
1351 if (ret == QUOTA_OK)
1352 /* Dirtify all the dquots - this can block when journalling */
1353 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1354 if (inode->i_dquot[cnt])
1355 mark_dquot_dirty(inode->i_dquot[cnt]);
1356 flush_warnings(inode->i_dquot, warntype);
1357 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1362 * This operation can block, but only after everything is updated
1364 int dquot_alloc_inode(const struct inode *inode, qsize_t number)
1366 int cnt, ret = NO_QUOTA;
1367 char warntype[MAXQUOTAS];
1369 /* First test before acquiring mutex - solves deadlocks when we
1370 * re-enter the quota code and are already holding the mutex */
1371 if (IS_NOQUOTA(inode))
1373 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1374 warntype[cnt] = QUOTA_NL_NOWARN;
1375 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1376 if (IS_NOQUOTA(inode)) {
1377 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1380 spin_lock(&dq_data_lock);
1381 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1382 if (inode->i_dquot[cnt] == NODQUOT)
1384 if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) == NO_QUOTA)
1388 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1389 if (inode->i_dquot[cnt] == NODQUOT)
1391 dquot_incr_inodes(inode->i_dquot[cnt], number);
1395 spin_unlock(&dq_data_lock);
1396 if (ret == QUOTA_OK)
1397 /* Dirtify all the dquots - this can block when journalling */
1398 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1399 if (inode->i_dquot[cnt])
1400 mark_dquot_dirty(inode->i_dquot[cnt]);
1401 flush_warnings(inode->i_dquot, warntype);
1402 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1407 * This operation can block, but only after everything is updated
1409 int dquot_free_space(struct inode *inode, qsize_t number)
1412 char warntype[MAXQUOTAS];
1414 /* First test before acquiring mutex - solves deadlocks when we
1415 * re-enter the quota code and are already holding the mutex */
1416 if (IS_NOQUOTA(inode)) {
1418 inode_sub_bytes(inode, number);
1422 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1423 /* Now recheck reliably when holding dqptr_sem */
1424 if (IS_NOQUOTA(inode)) {
1425 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1428 spin_lock(&dq_data_lock);
1429 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1430 if (inode->i_dquot[cnt] == NODQUOT)
1432 warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number);
1433 dquot_decr_space(inode->i_dquot[cnt], number);
1435 inode_sub_bytes(inode, number);
1436 spin_unlock(&dq_data_lock);
1437 /* Dirtify all the dquots - this can block when journalling */
1438 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1439 if (inode->i_dquot[cnt])
1440 mark_dquot_dirty(inode->i_dquot[cnt]);
1441 flush_warnings(inode->i_dquot, warntype);
1442 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1447 * This operation can block, but only after everything is updated
1449 int dquot_free_inode(const struct inode *inode, qsize_t number)
1452 char warntype[MAXQUOTAS];
1454 /* First test before acquiring mutex - solves deadlocks when we
1455 * re-enter the quota code and are already holding the mutex */
1456 if (IS_NOQUOTA(inode))
1459 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1460 /* Now recheck reliably when holding dqptr_sem */
1461 if (IS_NOQUOTA(inode)) {
1462 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1465 spin_lock(&dq_data_lock);
1466 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1467 if (inode->i_dquot[cnt] == NODQUOT)
1469 warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number);
1470 dquot_decr_inodes(inode->i_dquot[cnt], number);
1472 spin_unlock(&dq_data_lock);
1473 /* Dirtify all the dquots - this can block when journalling */
1474 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1475 if (inode->i_dquot[cnt])
1476 mark_dquot_dirty(inode->i_dquot[cnt]);
1477 flush_warnings(inode->i_dquot, warntype);
1478 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1483 * Transfer the number of inode and blocks from one diskquota to an other.
1485 * This operation can block, but only after everything is updated
1486 * A transaction must be started when entering this function.
1488 int dquot_transfer(struct inode *inode, struct iattr *iattr)
1491 struct dquot *transfer_from[MAXQUOTAS];
1492 struct dquot *transfer_to[MAXQUOTAS];
1493 int cnt, ret = QUOTA_OK;
1494 int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid,
1495 chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid;
1496 char warntype_to[MAXQUOTAS];
1497 char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS];
1499 /* First test before acquiring mutex - solves deadlocks when we
1500 * re-enter the quota code and are already holding the mutex */
1501 if (IS_NOQUOTA(inode))
1503 /* Initialize the arrays */
1504 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1505 transfer_from[cnt] = NODQUOT;
1506 transfer_to[cnt] = NODQUOT;
1507 warntype_to[cnt] = QUOTA_NL_NOWARN;
1512 transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_uid, cnt);
1517 transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_gid, cnt);
1522 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1523 /* Now recheck reliably when holding dqptr_sem */
1524 if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
1525 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1528 spin_lock(&dq_data_lock);
1529 space = inode_get_bytes(inode);
1530 /* Build the transfer_from list and check the limits */
1531 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1532 if (transfer_to[cnt] == NODQUOT)
1534 transfer_from[cnt] = inode->i_dquot[cnt];
1535 if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) ==
1536 NO_QUOTA || check_bdq(transfer_to[cnt], space, 0,
1537 warntype_to + cnt) == NO_QUOTA)
1542 * Finally perform the needed transfer from transfer_from to transfer_to
1544 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1546 * Skip changes for same uid or gid or for turned off quota-type.
1548 if (transfer_to[cnt] == NODQUOT)
1551 /* Due to IO error we might not have transfer_from[] structure */
1552 if (transfer_from[cnt]) {
1553 warntype_from_inodes[cnt] =
1554 info_idq_free(transfer_from[cnt], 1);
1555 warntype_from_space[cnt] =
1556 info_bdq_free(transfer_from[cnt], space);
1557 dquot_decr_inodes(transfer_from[cnt], 1);
1558 dquot_decr_space(transfer_from[cnt], space);
1561 dquot_incr_inodes(transfer_to[cnt], 1);
1562 dquot_incr_space(transfer_to[cnt], space);
1564 inode->i_dquot[cnt] = transfer_to[cnt];
1566 spin_unlock(&dq_data_lock);
1567 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1569 /* Dirtify all the dquots - this can block when journalling */
1570 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1571 if (transfer_from[cnt])
1572 mark_dquot_dirty(transfer_from[cnt]);
1573 if (transfer_to[cnt]) {
1574 mark_dquot_dirty(transfer_to[cnt]);
1575 /* The reference we got is transferred to the inode */
1576 transfer_to[cnt] = NODQUOT;
1580 flush_warnings(transfer_to, warntype_to);
1581 flush_warnings(transfer_from, warntype_from_inodes);
1582 flush_warnings(transfer_from, warntype_from_space);
1584 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1585 dqput(transfer_from[cnt]);
1586 dqput(transfer_to[cnt]);
1590 spin_unlock(&dq_data_lock);
1591 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1592 /* Clear dquot pointers we don't want to dqput() */
1593 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1594 transfer_from[cnt] = NODQUOT;
1599 /* Wrapper for transferring ownership of an inode */
1600 int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
1602 if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) {
1604 if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA)
1612 * Write info of quota file to disk
1614 int dquot_commit_info(struct super_block *sb, int type)
1617 struct quota_info *dqopt = sb_dqopt(sb);
1619 mutex_lock(&dqopt->dqio_mutex);
1620 ret = dqopt->ops[type]->write_file_info(sb, type);
1621 mutex_unlock(&dqopt->dqio_mutex);
1626 * Definitions of diskquota operations.
1628 struct dquot_operations dquot_operations = {
1629 .initialize = dquot_initialize,
1631 .alloc_space = dquot_alloc_space,
1632 .alloc_inode = dquot_alloc_inode,
1633 .free_space = dquot_free_space,
1634 .free_inode = dquot_free_inode,
1635 .transfer = dquot_transfer,
1636 .write_dquot = dquot_commit,
1637 .acquire_dquot = dquot_acquire,
1638 .release_dquot = dquot_release,
1639 .mark_dirty = dquot_mark_dquot_dirty,
1640 .write_info = dquot_commit_info,
1641 .alloc_dquot = dquot_alloc,
1642 .destroy_dquot = dquot_destroy,
1646 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1648 int vfs_quota_disable(struct super_block *sb, int type, unsigned int flags)
1651 struct quota_info *dqopt = sb_dqopt(sb);
1652 struct inode *toputinode[MAXQUOTAS];
1654 /* Cannot turn off usage accounting without turning off limits, or
1655 * suspend quotas and simultaneously turn quotas off. */
1656 if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED))
1657 || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED |
1658 DQUOT_USAGE_ENABLED)))
1661 /* We need to serialize quota_off() for device */
1662 mutex_lock(&dqopt->dqonoff_mutex);
1665 * Skip everything if there's nothing to do. We have to do this because
1666 * sometimes we are called when fill_super() failed and calling
1667 * sync_fs() in such cases does no good.
1669 if (!sb_any_quota_loaded(sb)) {
1670 mutex_unlock(&dqopt->dqonoff_mutex);
1673 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1674 toputinode[cnt] = NULL;
1675 if (type != -1 && cnt != type)
1677 if (!sb_has_quota_loaded(sb, cnt))
1680 if (flags & DQUOT_SUSPENDED) {
1681 spin_lock(&dq_state_lock);
1683 dquot_state_flag(DQUOT_SUSPENDED, cnt);
1684 spin_unlock(&dq_state_lock);
1686 spin_lock(&dq_state_lock);
1687 dqopt->flags &= ~dquot_state_flag(flags, cnt);
1688 /* Turning off suspended quotas? */
1689 if (!sb_has_quota_loaded(sb, cnt) &&
1690 sb_has_quota_suspended(sb, cnt)) {
1691 dqopt->flags &= ~dquot_state_flag(
1692 DQUOT_SUSPENDED, cnt);
1693 spin_unlock(&dq_state_lock);
1694 iput(dqopt->files[cnt]);
1695 dqopt->files[cnt] = NULL;
1698 spin_unlock(&dq_state_lock);
1701 /* We still have to keep quota loaded? */
1702 if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED))
1705 /* Note: these are blocking operations */
1706 drop_dquot_ref(sb, cnt);
1707 invalidate_dquots(sb, cnt);
1709 * Now all dquots should be invalidated, all writes done so we should be only
1710 * users of the info. No locks needed.
1712 if (info_dirty(&dqopt->info[cnt]))
1713 sb->dq_op->write_info(sb, cnt);
1714 if (dqopt->ops[cnt]->free_file_info)
1715 dqopt->ops[cnt]->free_file_info(sb, cnt);
1716 put_quota_format(dqopt->info[cnt].dqi_format);
1718 toputinode[cnt] = dqopt->files[cnt];
1719 if (!sb_has_quota_loaded(sb, cnt))
1720 dqopt->files[cnt] = NULL;
1721 dqopt->info[cnt].dqi_flags = 0;
1722 dqopt->info[cnt].dqi_igrace = 0;
1723 dqopt->info[cnt].dqi_bgrace = 0;
1724 dqopt->ops[cnt] = NULL;
1726 mutex_unlock(&dqopt->dqonoff_mutex);
1728 /* Skip syncing and setting flags if quota files are hidden */
1729 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
1732 /* Sync the superblock so that buffers with quota data are written to
1733 * disk (and so userspace sees correct data afterwards). */
1734 if (sb->s_op->sync_fs)
1735 sb->s_op->sync_fs(sb, 1);
1736 sync_blockdev(sb->s_bdev);
1737 /* Now the quota files are just ordinary files and we can set the
1738 * inode flags back. Moreover we discard the pagecache so that
1739 * userspace sees the writes we did bypassing the pagecache. We
1740 * must also discard the blockdev buffers so that we see the
1741 * changes done by userspace on the next quotaon() */
1742 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1743 if (toputinode[cnt]) {
1744 mutex_lock(&dqopt->dqonoff_mutex);
1745 /* If quota was reenabled in the meantime, we have
1747 if (!sb_has_quota_loaded(sb, cnt)) {
1748 mutex_lock_nested(&toputinode[cnt]->i_mutex, I_MUTEX_QUOTA);
1749 toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
1750 S_NOATIME | S_NOQUOTA);
1751 truncate_inode_pages(&toputinode[cnt]->i_data, 0);
1752 mutex_unlock(&toputinode[cnt]->i_mutex);
1753 mark_inode_dirty(toputinode[cnt]);
1755 mutex_unlock(&dqopt->dqonoff_mutex);
1758 invalidate_bdev(sb->s_bdev);
1760 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1761 if (toputinode[cnt]) {
1762 /* On remount RO, we keep the inode pointer so that we
1763 * can reenable quota on the subsequent remount RW. We
1764 * have to check 'flags' variable and not use sb_has_
1765 * function because another quotaon / quotaoff could
1766 * change global state before we got here. We refuse
1767 * to suspend quotas when there is pending delete on
1768 * the quota file... */
1769 if (!(flags & DQUOT_SUSPENDED))
1770 iput(toputinode[cnt]);
1771 else if (!toputinode[cnt]->i_nlink)
1777 int vfs_quota_off(struct super_block *sb, int type, int remount)
1779 return vfs_quota_disable(sb, type, remount ? DQUOT_SUSPENDED :
1780 (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED));
1784 * Turn quotas on on a device
1788 * Helper function to turn quotas on when we already have the inode of
1789 * quota file and no quota information is loaded.
1791 static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
1794 struct quota_format_type *fmt = find_quota_format(format_id);
1795 struct super_block *sb = inode->i_sb;
1796 struct quota_info *dqopt = sb_dqopt(sb);
1802 if (!S_ISREG(inode->i_mode)) {
1806 if (IS_RDONLY(inode)) {
1810 if (!sb->s_op->quota_write || !sb->s_op->quota_read) {
1814 /* Usage always has to be set... */
1815 if (!(flags & DQUOT_USAGE_ENABLED)) {
1820 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
1821 /* As we bypass the pagecache we must now flush the inode so
1822 * that we see all the changes from userspace... */
1823 write_inode_now(inode, 1);
1824 /* And now flush the block cache so that kernel sees the
1826 invalidate_bdev(sb->s_bdev);
1828 mutex_lock(&inode->i_mutex);
1829 mutex_lock(&dqopt->dqonoff_mutex);
1830 if (sb_has_quota_loaded(sb, type)) {
1835 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
1836 /* We don't want quota and atime on quota files (deadlocks
1837 * possible) Also nobody should write to the file - we use
1838 * special IO operations which ignore the immutable bit. */
1839 down_write(&dqopt->dqptr_sem);
1840 oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | S_NOQUOTA);
1841 inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
1842 up_write(&dqopt->dqptr_sem);
1843 sb->dq_op->drop(inode);
1847 dqopt->files[type] = igrab(inode);
1848 if (!dqopt->files[type])
1851 if (!fmt->qf_ops->check_quota_file(sb, type))
1854 dqopt->ops[type] = fmt->qf_ops;
1855 dqopt->info[type].dqi_format = fmt;
1856 dqopt->info[type].dqi_fmt_id = format_id;
1857 INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
1858 mutex_lock(&dqopt->dqio_mutex);
1859 if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) {
1860 mutex_unlock(&dqopt->dqio_mutex);
1863 mutex_unlock(&dqopt->dqio_mutex);
1864 mutex_unlock(&inode->i_mutex);
1865 spin_lock(&dq_state_lock);
1866 dqopt->flags |= dquot_state_flag(flags, type);
1867 spin_unlock(&dq_state_lock);
1869 add_dquot_ref(sb, type);
1870 mutex_unlock(&dqopt->dqonoff_mutex);
1875 dqopt->files[type] = NULL;
1878 mutex_unlock(&dqopt->dqonoff_mutex);
1879 if (oldflags != -1) {
1880 down_write(&dqopt->dqptr_sem);
1881 /* Set the flags back (in the case of accidental quotaon()
1882 * on a wrong file we don't want to mess up the flags) */
1883 inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
1884 inode->i_flags |= oldflags;
1885 up_write(&dqopt->dqptr_sem);
1887 mutex_unlock(&inode->i_mutex);
1889 put_quota_format(fmt);
1894 /* Reenable quotas on remount RW */
1895 static int vfs_quota_on_remount(struct super_block *sb, int type)
1897 struct quota_info *dqopt = sb_dqopt(sb);
1898 struct inode *inode;
1902 mutex_lock(&dqopt->dqonoff_mutex);
1903 if (!sb_has_quota_suspended(sb, type)) {
1904 mutex_unlock(&dqopt->dqonoff_mutex);
1907 inode = dqopt->files[type];
1908 dqopt->files[type] = NULL;
1909 spin_lock(&dq_state_lock);
1910 flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
1911 DQUOT_LIMITS_ENABLED, type);
1912 dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, type);
1913 spin_unlock(&dq_state_lock);
1914 mutex_unlock(&dqopt->dqonoff_mutex);
1916 flags = dquot_generic_flag(flags, type);
1917 ret = vfs_load_quota_inode(inode, type, dqopt->info[type].dqi_fmt_id,
1924 int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
1927 int error = security_quota_on(path->dentry);
1930 /* Quota file not on the same filesystem? */
1931 if (path->mnt->mnt_sb != sb)
1934 error = vfs_load_quota_inode(path->dentry->d_inode, type,
1935 format_id, DQUOT_USAGE_ENABLED |
1936 DQUOT_LIMITS_ENABLED);
1940 int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name,
1947 return vfs_quota_on_remount(sb, type);
1949 error = kern_path(name, LOOKUP_FOLLOW, &path);
1951 error = vfs_quota_on_path(sb, type, format_id, &path);
1958 * More powerful function for turning on quotas allowing setting
1959 * of individual quota flags
1961 int vfs_quota_enable(struct inode *inode, int type, int format_id,
1965 struct super_block *sb = inode->i_sb;
1966 struct quota_info *dqopt = sb_dqopt(sb);
1968 /* Just unsuspend quotas? */
1969 if (flags & DQUOT_SUSPENDED)
1970 return vfs_quota_on_remount(sb, type);
1973 /* Just updating flags needed? */
1974 if (sb_has_quota_loaded(sb, type)) {
1975 mutex_lock(&dqopt->dqonoff_mutex);
1976 /* Now do a reliable test... */
1977 if (!sb_has_quota_loaded(sb, type)) {
1978 mutex_unlock(&dqopt->dqonoff_mutex);
1981 if (flags & DQUOT_USAGE_ENABLED &&
1982 sb_has_quota_usage_enabled(sb, type)) {
1986 if (flags & DQUOT_LIMITS_ENABLED &&
1987 sb_has_quota_limits_enabled(sb, type)) {
1991 spin_lock(&dq_state_lock);
1992 sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
1993 spin_unlock(&dq_state_lock);
1995 mutex_unlock(&dqopt->dqonoff_mutex);
2000 return vfs_load_quota_inode(inode, type, format_id, flags);
2004 * This function is used when filesystem needs to initialize quotas
2005 * during mount time.
2007 int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
2008 int format_id, int type)
2010 struct dentry *dentry;
2013 dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
2015 return PTR_ERR(dentry);
2017 if (!dentry->d_inode) {
2022 error = security_quota_on(dentry);
2024 error = vfs_load_quota_inode(dentry->d_inode, type, format_id,
2025 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
2032 /* Wrapper to turn on quotas when remounting rw */
2033 int vfs_dq_quota_on_remount(struct super_block *sb)
2038 if (!sb->s_qcop || !sb->s_qcop->quota_on)
2040 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
2041 err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1);
2042 if (err < 0 && !ret)
2048 static inline qsize_t qbtos(qsize_t blocks)
2050 return blocks << QIF_DQBLKSIZE_BITS;
2053 static inline qsize_t stoqb(qsize_t space)
2055 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
2058 /* Generic routine for getting common part of quota structure */
2059 static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di)
2061 struct mem_dqblk *dm = &dquot->dq_dqb;
2063 spin_lock(&dq_data_lock);
2064 di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit);
2065 di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit);
2066 di->dqb_curspace = dm->dqb_curspace;
2067 di->dqb_ihardlimit = dm->dqb_ihardlimit;
2068 di->dqb_isoftlimit = dm->dqb_isoftlimit;
2069 di->dqb_curinodes = dm->dqb_curinodes;
2070 di->dqb_btime = dm->dqb_btime;
2071 di->dqb_itime = dm->dqb_itime;
2072 di->dqb_valid = QIF_ALL;
2073 spin_unlock(&dq_data_lock);
2076 int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
2078 struct dquot *dquot;
2080 dquot = dqget(sb, id, type);
2081 if (dquot == NODQUOT)
2083 do_get_dqblk(dquot, di);
2089 /* Generic routine for setting common part of quota structure */
2090 static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
2092 struct mem_dqblk *dm = &dquot->dq_dqb;
2093 int check_blim = 0, check_ilim = 0;
2094 struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
2096 if ((di->dqb_valid & QIF_BLIMITS &&
2097 (di->dqb_bhardlimit > dqi->dqi_maxblimit ||
2098 di->dqb_bsoftlimit > dqi->dqi_maxblimit)) ||
2099 (di->dqb_valid & QIF_ILIMITS &&
2100 (di->dqb_ihardlimit > dqi->dqi_maxilimit ||
2101 di->dqb_isoftlimit > dqi->dqi_maxilimit)))
2104 spin_lock(&dq_data_lock);
2105 if (di->dqb_valid & QIF_SPACE) {
2106 dm->dqb_curspace = di->dqb_curspace;
2108 __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
2110 if (di->dqb_valid & QIF_BLIMITS) {
2111 dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit);
2112 dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit);
2114 __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
2116 if (di->dqb_valid & QIF_INODES) {
2117 dm->dqb_curinodes = di->dqb_curinodes;
2119 __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
2121 if (di->dqb_valid & QIF_ILIMITS) {
2122 dm->dqb_isoftlimit = di->dqb_isoftlimit;
2123 dm->dqb_ihardlimit = di->dqb_ihardlimit;
2125 __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
2127 if (di->dqb_valid & QIF_BTIME) {
2128 dm->dqb_btime = di->dqb_btime;
2130 __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
2132 if (di->dqb_valid & QIF_ITIME) {
2133 dm->dqb_itime = di->dqb_itime;
2135 __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
2139 if (!dm->dqb_bsoftlimit || dm->dqb_curspace < dm->dqb_bsoftlimit) {
2141 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
2143 else if (!(di->dqb_valid & QIF_BTIME)) /* Set grace only if user hasn't provided his own... */
2144 dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
2147 if (!dm->dqb_isoftlimit || dm->dqb_curinodes < dm->dqb_isoftlimit) {
2149 clear_bit(DQ_INODES_B, &dquot->dq_flags);
2151 else if (!(di->dqb_valid & QIF_ITIME)) /* Set grace only if user hasn't provided his own... */
2152 dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
2154 if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || dm->dqb_isoftlimit)
2155 clear_bit(DQ_FAKE_B, &dquot->dq_flags);
2157 set_bit(DQ_FAKE_B, &dquot->dq_flags);
2158 spin_unlock(&dq_data_lock);
2159 mark_dquot_dirty(dquot);
2164 int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
2166 struct dquot *dquot;
2169 dquot = dqget(sb, id, type);
2174 rc = do_set_dqblk(dquot, di);
2180 /* Generic routine for getting common part of quota file information */
2181 int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2183 struct mem_dqinfo *mi;
2185 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2186 if (!sb_has_quota_active(sb, type)) {
2187 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2190 mi = sb_dqopt(sb)->info + type;
2191 spin_lock(&dq_data_lock);
2192 ii->dqi_bgrace = mi->dqi_bgrace;
2193 ii->dqi_igrace = mi->dqi_igrace;
2194 ii->dqi_flags = mi->dqi_flags & DQF_MASK;
2195 ii->dqi_valid = IIF_ALL;
2196 spin_unlock(&dq_data_lock);
2197 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2201 /* Generic routine for setting common part of quota file information */
2202 int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2204 struct mem_dqinfo *mi;
2207 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
2208 if (!sb_has_quota_active(sb, type)) {
2212 mi = sb_dqopt(sb)->info + type;
2213 spin_lock(&dq_data_lock);
2214 if (ii->dqi_valid & IIF_BGRACE)
2215 mi->dqi_bgrace = ii->dqi_bgrace;
2216 if (ii->dqi_valid & IIF_IGRACE)
2217 mi->dqi_igrace = ii->dqi_igrace;
2218 if (ii->dqi_valid & IIF_FLAGS)
2219 mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | (ii->dqi_flags & DQF_MASK);
2220 spin_unlock(&dq_data_lock);
2221 mark_info_dirty(sb, type);
2222 /* Force write to disk */
2223 sb->dq_op->write_info(sb, type);
2225 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
2229 struct quotactl_ops vfs_quotactl_ops = {
2230 .quota_on = vfs_quota_on,
2231 .quota_off = vfs_quota_off,
2232 .quota_sync = vfs_quota_sync,
2233 .get_info = vfs_get_dqinfo,
2234 .set_info = vfs_set_dqinfo,
2235 .get_dqblk = vfs_get_dqblk,
2236 .set_dqblk = vfs_set_dqblk
2239 static ctl_table fs_dqstats_table[] = {
2241 .ctl_name = FS_DQ_LOOKUPS,
2242 .procname = "lookups",
2243 .data = &dqstats.lookups,
2244 .maxlen = sizeof(int),
2246 .proc_handler = &proc_dointvec,
2249 .ctl_name = FS_DQ_DROPS,
2250 .procname = "drops",
2251 .data = &dqstats.drops,
2252 .maxlen = sizeof(int),
2254 .proc_handler = &proc_dointvec,
2257 .ctl_name = FS_DQ_READS,
2258 .procname = "reads",
2259 .data = &dqstats.reads,
2260 .maxlen = sizeof(int),
2262 .proc_handler = &proc_dointvec,
2265 .ctl_name = FS_DQ_WRITES,
2266 .procname = "writes",
2267 .data = &dqstats.writes,
2268 .maxlen = sizeof(int),
2270 .proc_handler = &proc_dointvec,
2273 .ctl_name = FS_DQ_CACHE_HITS,
2274 .procname = "cache_hits",
2275 .data = &dqstats.cache_hits,
2276 .maxlen = sizeof(int),
2278 .proc_handler = &proc_dointvec,
2281 .ctl_name = FS_DQ_ALLOCATED,
2282 .procname = "allocated_dquots",
2283 .data = &dqstats.allocated_dquots,
2284 .maxlen = sizeof(int),
2286 .proc_handler = &proc_dointvec,
2289 .ctl_name = FS_DQ_FREE,
2290 .procname = "free_dquots",
2291 .data = &dqstats.free_dquots,
2292 .maxlen = sizeof(int),
2294 .proc_handler = &proc_dointvec,
2297 .ctl_name = FS_DQ_SYNCS,
2298 .procname = "syncs",
2299 .data = &dqstats.syncs,
2300 .maxlen = sizeof(int),
2302 .proc_handler = &proc_dointvec,
2304 #ifdef CONFIG_PRINT_QUOTA_WARNING
2306 .ctl_name = FS_DQ_WARNINGS,
2307 .procname = "warnings",
2308 .data = &flag_print_warnings,
2309 .maxlen = sizeof(int),
2311 .proc_handler = &proc_dointvec,
2317 static ctl_table fs_table[] = {
2319 .ctl_name = FS_DQSTATS,
2320 .procname = "quota",
2322 .child = fs_dqstats_table,
2327 static ctl_table sys_table[] = {
2337 static int __init dquot_init(void)
2340 unsigned long nr_hash, order;
2342 printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
2344 register_sysctl_table(sys_table);
2346 dquot_cachep = kmem_cache_create("dquot",
2347 sizeof(struct dquot), sizeof(unsigned long) * 4,
2348 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
2349 SLAB_MEM_SPREAD|SLAB_PANIC),
2353 dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
2355 panic("Cannot create dquot hash table");
2357 /* Find power-of-two hlist_heads which can fit into allocation */
2358 nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
2362 } while (nr_hash >> dq_hash_bits);
2365 nr_hash = 1UL << dq_hash_bits;
2366 dq_hash_mask = nr_hash - 1;
2367 for (i = 0; i < nr_hash; i++)
2368 INIT_HLIST_HEAD(dquot_hash + i);
2370 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2371 nr_hash, order, (PAGE_SIZE << order));
2373 register_shrinker(&dqcache_shrinker);
2375 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
2376 if (genl_register_family("a_genl_family) != 0)
2377 printk(KERN_ERR "VFS: Failed to create quota netlink interface.\n");
2382 module_init(dquot_init);
2384 EXPORT_SYMBOL(register_quota_format);
2385 EXPORT_SYMBOL(unregister_quota_format);
2386 EXPORT_SYMBOL(dqstats);
2387 EXPORT_SYMBOL(dq_data_lock);
2388 EXPORT_SYMBOL(vfs_quota_enable);
2389 EXPORT_SYMBOL(vfs_quota_on);
2390 EXPORT_SYMBOL(vfs_quota_on_path);
2391 EXPORT_SYMBOL(vfs_quota_on_mount);
2392 EXPORT_SYMBOL(vfs_quota_disable);
2393 EXPORT_SYMBOL(vfs_quota_off);
2394 EXPORT_SYMBOL(dquot_scan_active);
2395 EXPORT_SYMBOL(vfs_quota_sync);
2396 EXPORT_SYMBOL(vfs_get_dqinfo);
2397 EXPORT_SYMBOL(vfs_set_dqinfo);
2398 EXPORT_SYMBOL(vfs_get_dqblk);
2399 EXPORT_SYMBOL(vfs_set_dqblk);
2400 EXPORT_SYMBOL(dquot_commit);
2401 EXPORT_SYMBOL(dquot_commit_info);
2402 EXPORT_SYMBOL(dquot_acquire);
2403 EXPORT_SYMBOL(dquot_release);
2404 EXPORT_SYMBOL(dquot_mark_dquot_dirty);
2405 EXPORT_SYMBOL(dquot_initialize);
2406 EXPORT_SYMBOL(dquot_drop);
2407 EXPORT_SYMBOL(vfs_dq_drop);
2408 EXPORT_SYMBOL(dqget);
2409 EXPORT_SYMBOL(dqput);
2410 EXPORT_SYMBOL(dquot_alloc_space);
2411 EXPORT_SYMBOL(dquot_alloc_inode);
2412 EXPORT_SYMBOL(dquot_free_space);
2413 EXPORT_SYMBOL(dquot_free_inode);
2414 EXPORT_SYMBOL(dquot_transfer);
2415 EXPORT_SYMBOL(vfs_dq_transfer);
2416 EXPORT_SYMBOL(vfs_dq_quota_on_remount);