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/sched.h>
75 #include <linux/kmod.h>
76 #include <linux/namei.h>
77 #include <linux/capability.h>
78 #include <linux/quotaops.h>
79 #include "../internal.h" /* ugh */
81 #include <asm/uaccess.h>
84 * There are three quota SMP locks. dq_list_lock protects all lists with quotas
86 * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
87 * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
88 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
89 * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
90 * modifications of quota state (on quotaon and quotaoff) and readers who care
91 * about latest values take it as well.
93 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
94 * dq_list_lock > dq_state_lock
96 * Note that some things (eg. sb pointer, type, id) doesn't change during
97 * the life of the dquot structure and so needn't to be protected by a lock
99 * Any operation working on dquots via inode pointers must hold dqptr_sem. If
100 * operation is just reading pointers from inode (or not using them at all) the
101 * read lock is enough. If pointers are altered function must hold write lock.
102 * Special care needs to be taken about S_NOQUOTA inode flag (marking that
103 * inode is a quota file). Functions adding pointers from inode to dquots have
104 * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they
105 * have to do all pointer modifications before dropping dqptr_sem. This makes
106 * sure they cannot race with quotaon which first sets S_NOQUOTA flag and
107 * then drops all pointers to dquots from an inode.
109 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
110 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
111 * Currently dquot is locked only when it is being read to memory (or space for
112 * it is being allocated) on the first dqget() and when it is being released on
113 * the last dqput(). The allocation and release oparations are serialized by
114 * the dq_lock and by checking the use count in dquot_release(). Write
115 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
116 * spinlock to internal buffers before writing.
118 * Lock ordering (including related VFS locks) is the following:
119 * dqonoff_mutex > i_mutex > journal_lock > dqptr_sem > dquot->dq_lock >
121 * dqonoff_mutex > i_mutex comes from dquot_quota_sync, dquot_enable, etc.
122 * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
123 * dqptr_sem. But filesystem has to count with the fact that functions such as
124 * dquot_alloc_space() acquire dqptr_sem and they usually have to be called
125 * from inside a transaction to keep filesystem consistency after a crash. Also
126 * filesystems usually want to do some IO on dquot from ->mark_dirty which is
127 * called with dqptr_sem held.
130 static __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_list_lock
);
131 static __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_state_lock
);
132 __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_data_lock
);
133 EXPORT_SYMBOL(dq_data_lock
);
135 void __quota_error(struct super_block
*sb
, const char *func
,
136 const char *fmt
, ...)
138 if (printk_ratelimit()) {
140 struct va_format vaf
;
147 printk(KERN_ERR
"Quota error (device %s): %s: %pV\n",
148 sb
->s_id
, func
, &vaf
);
153 EXPORT_SYMBOL(__quota_error
);
155 #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING)
156 static char *quotatypes
[] = INITQFNAMES
;
158 static struct quota_format_type
*quota_formats
; /* List of registered formats */
159 static struct quota_module_name module_names
[] = INIT_QUOTA_MODULE_NAMES
;
161 /* SLAB cache for dquot structures */
162 static struct kmem_cache
*dquot_cachep
;
164 int register_quota_format(struct quota_format_type
*fmt
)
166 spin_lock(&dq_list_lock
);
167 fmt
->qf_next
= quota_formats
;
169 spin_unlock(&dq_list_lock
);
172 EXPORT_SYMBOL(register_quota_format
);
174 void unregister_quota_format(struct quota_format_type
*fmt
)
176 struct quota_format_type
**actqf
;
178 spin_lock(&dq_list_lock
);
179 for (actqf
= "a_formats
; *actqf
&& *actqf
!= fmt
;
180 actqf
= &(*actqf
)->qf_next
)
183 *actqf
= (*actqf
)->qf_next
;
184 spin_unlock(&dq_list_lock
);
186 EXPORT_SYMBOL(unregister_quota_format
);
188 static struct quota_format_type
*find_quota_format(int id
)
190 struct quota_format_type
*actqf
;
192 spin_lock(&dq_list_lock
);
193 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
194 actqf
= actqf
->qf_next
)
196 if (!actqf
|| !try_module_get(actqf
->qf_owner
)) {
199 spin_unlock(&dq_list_lock
);
201 for (qm
= 0; module_names
[qm
].qm_fmt_id
&&
202 module_names
[qm
].qm_fmt_id
!= id
; qm
++)
204 if (!module_names
[qm
].qm_fmt_id
||
205 request_module(module_names
[qm
].qm_mod_name
))
208 spin_lock(&dq_list_lock
);
209 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
210 actqf
= actqf
->qf_next
)
212 if (actqf
&& !try_module_get(actqf
->qf_owner
))
215 spin_unlock(&dq_list_lock
);
219 static void put_quota_format(struct quota_format_type
*fmt
)
221 module_put(fmt
->qf_owner
);
225 * Dquot List Management:
226 * The quota code uses three lists for dquot management: the inuse_list,
227 * free_dquots, and dquot_hash[] array. A single dquot structure may be
228 * on all three lists, depending on its current state.
230 * All dquots are placed to the end of inuse_list when first created, and this
231 * list is used for invalidate operation, which must look at every dquot.
233 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
234 * and this list is searched whenever we need an available dquot. Dquots are
235 * removed from the list as soon as they are used again, and
236 * dqstats.free_dquots gives the number of dquots on the list. When
237 * dquot is invalidated it's completely released from memory.
239 * Dquots with a specific identity (device, type and id) are placed on
240 * one of the dquot_hash[] hash chains. The provides an efficient search
241 * mechanism to locate a specific dquot.
244 static LIST_HEAD(inuse_list
);
245 static LIST_HEAD(free_dquots
);
246 static unsigned int dq_hash_bits
, dq_hash_mask
;
247 static struct hlist_head
*dquot_hash
;
249 struct dqstats dqstats
;
250 EXPORT_SYMBOL(dqstats
);
252 static qsize_t
inode_get_rsv_space(struct inode
*inode
);
253 static void __dquot_initialize(struct inode
*inode
, int type
);
255 static inline unsigned int
256 hashfn(const struct super_block
*sb
, unsigned int id
, int type
)
260 tmp
= (((unsigned long)sb
>>L1_CACHE_SHIFT
) ^ id
) * (MAXQUOTAS
- type
);
261 return (tmp
+ (tmp
>> dq_hash_bits
)) & dq_hash_mask
;
265 * Following list functions expect dq_list_lock to be held
267 static inline void insert_dquot_hash(struct dquot
*dquot
)
269 struct hlist_head
*head
;
270 head
= dquot_hash
+ hashfn(dquot
->dq_sb
, dquot
->dq_id
, dquot
->dq_type
);
271 hlist_add_head(&dquot
->dq_hash
, head
);
274 static inline void remove_dquot_hash(struct dquot
*dquot
)
276 hlist_del_init(&dquot
->dq_hash
);
279 static struct dquot
*find_dquot(unsigned int hashent
, struct super_block
*sb
,
280 unsigned int id
, int type
)
282 struct hlist_node
*node
;
285 hlist_for_each (node
, dquot_hash
+hashent
) {
286 dquot
= hlist_entry(node
, struct dquot
, dq_hash
);
287 if (dquot
->dq_sb
== sb
&& dquot
->dq_id
== id
&&
288 dquot
->dq_type
== type
)
294 /* Add a dquot to the tail of the free list */
295 static inline void put_dquot_last(struct dquot
*dquot
)
297 list_add_tail(&dquot
->dq_free
, &free_dquots
);
298 dqstats_inc(DQST_FREE_DQUOTS
);
301 static inline void remove_free_dquot(struct dquot
*dquot
)
303 if (list_empty(&dquot
->dq_free
))
305 list_del_init(&dquot
->dq_free
);
306 dqstats_dec(DQST_FREE_DQUOTS
);
309 static inline void put_inuse(struct dquot
*dquot
)
311 /* We add to the back of inuse list so we don't have to restart
312 * when traversing this list and we block */
313 list_add_tail(&dquot
->dq_inuse
, &inuse_list
);
314 dqstats_inc(DQST_ALLOC_DQUOTS
);
317 static inline void remove_inuse(struct dquot
*dquot
)
319 dqstats_dec(DQST_ALLOC_DQUOTS
);
320 list_del(&dquot
->dq_inuse
);
323 * End of list functions needing dq_list_lock
326 static void wait_on_dquot(struct dquot
*dquot
)
328 mutex_lock(&dquot
->dq_lock
);
329 mutex_unlock(&dquot
->dq_lock
);
332 static inline int dquot_dirty(struct dquot
*dquot
)
334 return test_bit(DQ_MOD_B
, &dquot
->dq_flags
);
337 static inline int mark_dquot_dirty(struct dquot
*dquot
)
339 return dquot
->dq_sb
->dq_op
->mark_dirty(dquot
);
342 /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */
343 int dquot_mark_dquot_dirty(struct dquot
*dquot
)
347 /* If quota is dirty already, we don't have to acquire dq_list_lock */
348 if (test_bit(DQ_MOD_B
, &dquot
->dq_flags
))
351 spin_lock(&dq_list_lock
);
352 if (!test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
)) {
353 list_add(&dquot
->dq_dirty
, &sb_dqopt(dquot
->dq_sb
)->
354 info
[dquot
->dq_type
].dqi_dirty_list
);
357 spin_unlock(&dq_list_lock
);
360 EXPORT_SYMBOL(dquot_mark_dquot_dirty
);
362 /* Dirtify all the dquots - this can block when journalling */
363 static inline int mark_all_dquot_dirty(struct dquot
* const *dquot
)
368 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
370 /* Even in case of error we have to continue */
371 ret
= mark_dquot_dirty(dquot
[cnt
]);
378 static inline void dqput_all(struct dquot
**dquot
)
382 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
386 /* This function needs dq_list_lock */
387 static inline int clear_dquot_dirty(struct dquot
*dquot
)
389 if (!test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
))
391 list_del_init(&dquot
->dq_dirty
);
395 void mark_info_dirty(struct super_block
*sb
, int type
)
397 set_bit(DQF_INFO_DIRTY_B
, &sb_dqopt(sb
)->info
[type
].dqi_flags
);
399 EXPORT_SYMBOL(mark_info_dirty
);
402 * Read dquot from disk and alloc space for it
405 int dquot_acquire(struct dquot
*dquot
)
407 int ret
= 0, ret2
= 0;
408 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
410 mutex_lock(&dquot
->dq_lock
);
411 mutex_lock(&dqopt
->dqio_mutex
);
412 if (!test_bit(DQ_READ_B
, &dquot
->dq_flags
))
413 ret
= dqopt
->ops
[dquot
->dq_type
]->read_dqblk(dquot
);
416 set_bit(DQ_READ_B
, &dquot
->dq_flags
);
417 /* Instantiate dquot if needed */
418 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && !dquot
->dq_off
) {
419 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
420 /* Write the info if needed */
421 if (info_dirty(&dqopt
->info
[dquot
->dq_type
])) {
422 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(
423 dquot
->dq_sb
, dquot
->dq_type
);
432 set_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
434 mutex_unlock(&dqopt
->dqio_mutex
);
435 mutex_unlock(&dquot
->dq_lock
);
438 EXPORT_SYMBOL(dquot_acquire
);
441 * Write dquot to disk
443 int dquot_commit(struct dquot
*dquot
)
446 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
448 mutex_lock(&dqopt
->dqio_mutex
);
449 spin_lock(&dq_list_lock
);
450 if (!clear_dquot_dirty(dquot
)) {
451 spin_unlock(&dq_list_lock
);
454 spin_unlock(&dq_list_lock
);
455 /* Inactive dquot can be only if there was error during read/init
456 * => we have better not writing it */
457 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
458 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
462 mutex_unlock(&dqopt
->dqio_mutex
);
465 EXPORT_SYMBOL(dquot_commit
);
470 int dquot_release(struct dquot
*dquot
)
472 int ret
= 0, ret2
= 0;
473 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
475 mutex_lock(&dquot
->dq_lock
);
476 /* Check whether we are not racing with some other dqget() */
477 if (atomic_read(&dquot
->dq_count
) > 1)
479 mutex_lock(&dqopt
->dqio_mutex
);
480 if (dqopt
->ops
[dquot
->dq_type
]->release_dqblk
) {
481 ret
= dqopt
->ops
[dquot
->dq_type
]->release_dqblk(dquot
);
483 if (info_dirty(&dqopt
->info
[dquot
->dq_type
])) {
484 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(
485 dquot
->dq_sb
, dquot
->dq_type
);
490 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
491 mutex_unlock(&dqopt
->dqio_mutex
);
493 mutex_unlock(&dquot
->dq_lock
);
496 EXPORT_SYMBOL(dquot_release
);
498 void dquot_destroy(struct dquot
*dquot
)
500 kmem_cache_free(dquot_cachep
, dquot
);
502 EXPORT_SYMBOL(dquot_destroy
);
504 static inline void do_destroy_dquot(struct dquot
*dquot
)
506 dquot
->dq_sb
->dq_op
->destroy_dquot(dquot
);
509 /* Invalidate all dquots on the list. Note that this function is called after
510 * quota is disabled and pointers from inodes removed so there cannot be new
511 * quota users. There can still be some users of quotas due to inodes being
512 * just deleted or pruned by prune_icache() (those are not attached to any
513 * list) or parallel quotactl call. We have to wait for such users.
515 static void invalidate_dquots(struct super_block
*sb
, int type
)
517 struct dquot
*dquot
, *tmp
;
520 spin_lock(&dq_list_lock
);
521 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
522 if (dquot
->dq_sb
!= sb
)
524 if (dquot
->dq_type
!= type
)
526 /* Wait for dquot users */
527 if (atomic_read(&dquot
->dq_count
)) {
530 atomic_inc(&dquot
->dq_count
);
531 prepare_to_wait(&dquot
->dq_wait_unused
, &wait
,
532 TASK_UNINTERRUPTIBLE
);
533 spin_unlock(&dq_list_lock
);
534 /* Once dqput() wakes us up, we know it's time to free
536 * IMPORTANT: we rely on the fact that there is always
537 * at most one process waiting for dquot to free.
538 * Otherwise dq_count would be > 1 and we would never
541 if (atomic_read(&dquot
->dq_count
) > 1)
543 finish_wait(&dquot
->dq_wait_unused
, &wait
);
545 /* At this moment dquot() need not exist (it could be
546 * reclaimed by prune_dqcache(). Hence we must
551 * Quota now has no users and it has been written on last
554 remove_dquot_hash(dquot
);
555 remove_free_dquot(dquot
);
557 do_destroy_dquot(dquot
);
559 spin_unlock(&dq_list_lock
);
562 /* Call callback for every active dquot on given filesystem */
563 int dquot_scan_active(struct super_block
*sb
,
564 int (*fn
)(struct dquot
*dquot
, unsigned long priv
),
567 struct dquot
*dquot
, *old_dquot
= NULL
;
570 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
571 spin_lock(&dq_list_lock
);
572 list_for_each_entry(dquot
, &inuse_list
, dq_inuse
) {
573 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
575 if (dquot
->dq_sb
!= sb
)
577 /* Now we have active dquot so we can just increase use count */
578 atomic_inc(&dquot
->dq_count
);
579 spin_unlock(&dq_list_lock
);
580 dqstats_inc(DQST_LOOKUPS
);
583 ret
= fn(dquot
, priv
);
586 spin_lock(&dq_list_lock
);
587 /* We are safe to continue now because our dquot could not
588 * be moved out of the inuse list while we hold the reference */
590 spin_unlock(&dq_list_lock
);
593 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
596 EXPORT_SYMBOL(dquot_scan_active
);
598 int dquot_quota_sync(struct super_block
*sb
, int type
, int wait
)
600 struct list_head
*dirty
;
602 struct quota_info
*dqopt
= sb_dqopt(sb
);
605 mutex_lock(&dqopt
->dqonoff_mutex
);
606 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
607 if (type
!= -1 && cnt
!= type
)
609 if (!sb_has_quota_active(sb
, cnt
))
611 spin_lock(&dq_list_lock
);
612 dirty
= &dqopt
->info
[cnt
].dqi_dirty_list
;
613 while (!list_empty(dirty
)) {
614 dquot
= list_first_entry(dirty
, struct dquot
,
616 /* Dirty and inactive can be only bad dquot... */
617 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
618 clear_dquot_dirty(dquot
);
621 /* Now we have active dquot from which someone is
622 * holding reference so we can safely just increase
624 atomic_inc(&dquot
->dq_count
);
625 spin_unlock(&dq_list_lock
);
626 dqstats_inc(DQST_LOOKUPS
);
627 sb
->dq_op
->write_dquot(dquot
);
629 spin_lock(&dq_list_lock
);
631 spin_unlock(&dq_list_lock
);
634 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
635 if ((cnt
== type
|| type
== -1) && sb_has_quota_active(sb
, cnt
)
636 && info_dirty(&dqopt
->info
[cnt
]))
637 sb
->dq_op
->write_info(sb
, cnt
);
638 dqstats_inc(DQST_SYNCS
);
639 mutex_unlock(&dqopt
->dqonoff_mutex
);
641 if (!wait
|| (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
))
644 /* This is not very clever (and fast) but currently I don't know about
645 * any other simple way of getting quota data to disk and we must get
646 * them there for userspace to be visible... */
647 if (sb
->s_op
->sync_fs
)
648 sb
->s_op
->sync_fs(sb
, 1);
649 sync_blockdev(sb
->s_bdev
);
652 * Now when everything is written we can discard the pagecache so
653 * that userspace sees the changes.
655 mutex_lock(&dqopt
->dqonoff_mutex
);
656 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
657 if (type
!= -1 && cnt
!= type
)
659 if (!sb_has_quota_active(sb
, cnt
))
661 mutex_lock(&dqopt
->files
[cnt
]->i_mutex
);
662 truncate_inode_pages(&dqopt
->files
[cnt
]->i_data
, 0);
663 mutex_unlock(&dqopt
->files
[cnt
]->i_mutex
);
665 mutex_unlock(&dqopt
->dqonoff_mutex
);
669 EXPORT_SYMBOL(dquot_quota_sync
);
671 /* Free unused dquots from cache */
672 static void prune_dqcache(int count
)
674 struct list_head
*head
;
677 head
= free_dquots
.prev
;
678 while (head
!= &free_dquots
&& count
) {
679 dquot
= list_entry(head
, struct dquot
, dq_free
);
680 remove_dquot_hash(dquot
);
681 remove_free_dquot(dquot
);
683 do_destroy_dquot(dquot
);
685 head
= free_dquots
.prev
;
690 * This is called from kswapd when we think we need some
693 static int shrink_dqcache_memory(struct shrinker
*shrink
,
694 struct shrink_control
*sc
)
696 int nr
= sc
->nr_to_scan
;
699 spin_lock(&dq_list_lock
);
701 spin_unlock(&dq_list_lock
);
704 percpu_counter_read_positive(&dqstats
.counter
[DQST_FREE_DQUOTS
])
705 /100) * sysctl_vfs_cache_pressure
;
708 static struct shrinker dqcache_shrinker
= {
709 .shrink
= shrink_dqcache_memory
,
710 .seeks
= DEFAULT_SEEKS
,
714 * Put reference to dquot
715 * NOTE: If you change this function please check whether dqput_blocks() works right...
717 void dqput(struct dquot
*dquot
)
723 #ifdef CONFIG_QUOTA_DEBUG
724 if (!atomic_read(&dquot
->dq_count
)) {
725 quota_error(dquot
->dq_sb
, "trying to free free dquot of %s %d",
726 quotatypes
[dquot
->dq_type
], dquot
->dq_id
);
730 dqstats_inc(DQST_DROPS
);
732 spin_lock(&dq_list_lock
);
733 if (atomic_read(&dquot
->dq_count
) > 1) {
734 /* We have more than one user... nothing to do */
735 atomic_dec(&dquot
->dq_count
);
736 /* Releasing dquot during quotaoff phase? */
737 if (!sb_has_quota_active(dquot
->dq_sb
, dquot
->dq_type
) &&
738 atomic_read(&dquot
->dq_count
) == 1)
739 wake_up(&dquot
->dq_wait_unused
);
740 spin_unlock(&dq_list_lock
);
743 /* Need to release dquot? */
744 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && dquot_dirty(dquot
)) {
745 spin_unlock(&dq_list_lock
);
746 /* Commit dquot before releasing */
747 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
749 quota_error(dquot
->dq_sb
, "Can't write quota structure"
750 " (error %d). Quota may get out of sync!",
753 * We clear dirty bit anyway, so that we avoid
756 spin_lock(&dq_list_lock
);
757 clear_dquot_dirty(dquot
);
758 spin_unlock(&dq_list_lock
);
762 /* Clear flag in case dquot was inactive (something bad happened) */
763 clear_dquot_dirty(dquot
);
764 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
765 spin_unlock(&dq_list_lock
);
766 dquot
->dq_sb
->dq_op
->release_dquot(dquot
);
769 atomic_dec(&dquot
->dq_count
);
770 #ifdef CONFIG_QUOTA_DEBUG
772 BUG_ON(!list_empty(&dquot
->dq_free
));
774 put_dquot_last(dquot
);
775 spin_unlock(&dq_list_lock
);
777 EXPORT_SYMBOL(dqput
);
779 struct dquot
*dquot_alloc(struct super_block
*sb
, int type
)
781 return kmem_cache_zalloc(dquot_cachep
, GFP_NOFS
);
783 EXPORT_SYMBOL(dquot_alloc
);
785 static struct dquot
*get_empty_dquot(struct super_block
*sb
, int type
)
789 dquot
= sb
->dq_op
->alloc_dquot(sb
, type
);
793 mutex_init(&dquot
->dq_lock
);
794 INIT_LIST_HEAD(&dquot
->dq_free
);
795 INIT_LIST_HEAD(&dquot
->dq_inuse
);
796 INIT_HLIST_NODE(&dquot
->dq_hash
);
797 INIT_LIST_HEAD(&dquot
->dq_dirty
);
798 init_waitqueue_head(&dquot
->dq_wait_unused
);
800 dquot
->dq_type
= type
;
801 atomic_set(&dquot
->dq_count
, 1);
807 * Get reference to dquot
809 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
810 * destroying our dquot by:
811 * a) checking for quota flags under dq_list_lock and
812 * b) getting a reference to dquot before we release dq_list_lock
814 struct dquot
*dqget(struct super_block
*sb
, unsigned int id
, int type
)
816 unsigned int hashent
= hashfn(sb
, id
, type
);
817 struct dquot
*dquot
= NULL
, *empty
= NULL
;
819 if (!sb_has_quota_active(sb
, type
))
822 spin_lock(&dq_list_lock
);
823 spin_lock(&dq_state_lock
);
824 if (!sb_has_quota_active(sb
, type
)) {
825 spin_unlock(&dq_state_lock
);
826 spin_unlock(&dq_list_lock
);
829 spin_unlock(&dq_state_lock
);
831 dquot
= find_dquot(hashent
, sb
, id
, type
);
834 spin_unlock(&dq_list_lock
);
835 empty
= get_empty_dquot(sb
, type
);
837 schedule(); /* Try to wait for a moment... */
843 /* all dquots go on the inuse_list */
845 /* hash it first so it can be found */
846 insert_dquot_hash(dquot
);
847 spin_unlock(&dq_list_lock
);
848 dqstats_inc(DQST_LOOKUPS
);
850 if (!atomic_read(&dquot
->dq_count
))
851 remove_free_dquot(dquot
);
852 atomic_inc(&dquot
->dq_count
);
853 spin_unlock(&dq_list_lock
);
854 dqstats_inc(DQST_CACHE_HITS
);
855 dqstats_inc(DQST_LOOKUPS
);
857 /* Wait for dq_lock - after this we know that either dquot_release() is
858 * already finished or it will be canceled due to dq_count > 1 test */
859 wait_on_dquot(dquot
);
860 /* Read the dquot / allocate space in quota file */
861 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) &&
862 sb
->dq_op
->acquire_dquot(dquot
) < 0) {
867 #ifdef CONFIG_QUOTA_DEBUG
868 BUG_ON(!dquot
->dq_sb
); /* Has somebody invalidated entry under us? */
872 do_destroy_dquot(empty
);
876 EXPORT_SYMBOL(dqget
);
878 static int dqinit_needed(struct inode
*inode
, int type
)
882 if (IS_NOQUOTA(inode
))
885 return !inode
->i_dquot
[type
];
886 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
887 if (!inode
->i_dquot
[cnt
])
892 /* This routine is guarded by dqonoff_mutex mutex */
893 static void add_dquot_ref(struct super_block
*sb
, int type
)
895 struct inode
*inode
, *old_inode
= NULL
;
896 #ifdef CONFIG_QUOTA_DEBUG
900 spin_lock(&inode_sb_list_lock
);
901 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
902 spin_lock(&inode
->i_lock
);
903 if ((inode
->i_state
& (I_FREEING
|I_WILL_FREE
|I_NEW
)) ||
904 !atomic_read(&inode
->i_writecount
) ||
905 !dqinit_needed(inode
, type
)) {
906 spin_unlock(&inode
->i_lock
);
910 spin_unlock(&inode
->i_lock
);
911 spin_unlock(&inode_sb_list_lock
);
913 #ifdef CONFIG_QUOTA_DEBUG
914 if (unlikely(inode_get_rsv_space(inode
) > 0))
918 __dquot_initialize(inode
, type
);
921 * We hold a reference to 'inode' so it couldn't have been
922 * removed from s_inodes list while we dropped the
923 * inode_sb_list_lock We cannot iput the inode now as we can be
924 * holding the last reference and we cannot iput it under
925 * inode_sb_list_lock. So we keep the reference and iput it
929 spin_lock(&inode_sb_list_lock
);
931 spin_unlock(&inode_sb_list_lock
);
934 #ifdef CONFIG_QUOTA_DEBUG
936 quota_error(sb
, "Writes happened before quota was turned on "
937 "thus quota information is probably inconsistent. "
938 "Please run quotacheck(8)");
944 * Return 0 if dqput() won't block.
945 * (note that 1 doesn't necessarily mean blocking)
947 static inline int dqput_blocks(struct dquot
*dquot
)
949 if (atomic_read(&dquot
->dq_count
) <= 1)
955 * Remove references to dquots from inode and add dquot to list for freeing
956 * if we have the last reference to dquot
957 * We can't race with anybody because we hold dqptr_sem for writing...
959 static int remove_inode_dquot_ref(struct inode
*inode
, int type
,
960 struct list_head
*tofree_head
)
962 struct dquot
*dquot
= inode
->i_dquot
[type
];
964 inode
->i_dquot
[type
] = NULL
;
966 if (dqput_blocks(dquot
)) {
967 #ifdef CONFIG_QUOTA_DEBUG
968 if (atomic_read(&dquot
->dq_count
) != 1)
969 quota_error(inode
->i_sb
, "Adding dquot with "
970 "dq_count %d to dispose list",
971 atomic_read(&dquot
->dq_count
));
973 spin_lock(&dq_list_lock
);
974 /* As dquot must have currently users it can't be on
975 * the free list... */
976 list_add(&dquot
->dq_free
, tofree_head
);
977 spin_unlock(&dq_list_lock
);
981 dqput(dquot
); /* We have guaranteed we won't block */
987 * Free list of dquots
988 * Dquots are removed from inodes and no new references can be got so we are
989 * the only ones holding reference
991 static void put_dquot_list(struct list_head
*tofree_head
)
993 struct list_head
*act_head
;
996 act_head
= tofree_head
->next
;
997 while (act_head
!= tofree_head
) {
998 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
999 act_head
= act_head
->next
;
1000 /* Remove dquot from the list so we won't have problems... */
1001 list_del_init(&dquot
->dq_free
);
1006 static void remove_dquot_ref(struct super_block
*sb
, int type
,
1007 struct list_head
*tofree_head
)
1009 struct inode
*inode
;
1012 spin_lock(&inode_sb_list_lock
);
1013 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
1015 * We have to scan also I_NEW inodes because they can already
1016 * have quota pointer initialized. Luckily, we need to touch
1017 * only quota pointers and these have separate locking
1020 if (!IS_NOQUOTA(inode
)) {
1021 if (unlikely(inode_get_rsv_space(inode
) > 0))
1023 remove_inode_dquot_ref(inode
, type
, tofree_head
);
1026 spin_unlock(&inode_sb_list_lock
);
1027 #ifdef CONFIG_QUOTA_DEBUG
1029 printk(KERN_WARNING
"VFS (%s): Writes happened after quota"
1030 " was disabled thus quota information is probably "
1031 "inconsistent. Please run quotacheck(8).\n", sb
->s_id
);
1036 /* Gather all references from inodes and drop them */
1037 static void drop_dquot_ref(struct super_block
*sb
, int type
)
1039 LIST_HEAD(tofree_head
);
1042 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1043 remove_dquot_ref(sb
, type
, &tofree_head
);
1044 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1045 put_dquot_list(&tofree_head
);
1049 static inline void dquot_incr_inodes(struct dquot
*dquot
, qsize_t number
)
1051 dquot
->dq_dqb
.dqb_curinodes
+= number
;
1054 static inline void dquot_incr_space(struct dquot
*dquot
, qsize_t number
)
1056 dquot
->dq_dqb
.dqb_curspace
+= number
;
1059 static inline void dquot_resv_space(struct dquot
*dquot
, qsize_t number
)
1061 dquot
->dq_dqb
.dqb_rsvspace
+= number
;
1065 * Claim reserved quota space
1067 static void dquot_claim_reserved_space(struct dquot
*dquot
, qsize_t number
)
1069 if (dquot
->dq_dqb
.dqb_rsvspace
< number
) {
1071 number
= dquot
->dq_dqb
.dqb_rsvspace
;
1073 dquot
->dq_dqb
.dqb_curspace
+= number
;
1074 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1078 void dquot_free_reserved_space(struct dquot
*dquot
, qsize_t number
)
1080 if (dquot
->dq_dqb
.dqb_rsvspace
>= number
)
1081 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1084 dquot
->dq_dqb
.dqb_rsvspace
= 0;
1088 static void dquot_decr_inodes(struct dquot
*dquot
, qsize_t number
)
1090 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1091 dquot
->dq_dqb
.dqb_curinodes
>= number
)
1092 dquot
->dq_dqb
.dqb_curinodes
-= number
;
1094 dquot
->dq_dqb
.dqb_curinodes
= 0;
1095 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1096 dquot
->dq_dqb
.dqb_itime
= (time_t) 0;
1097 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
1100 static void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
1102 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1103 dquot
->dq_dqb
.dqb_curspace
>= number
)
1104 dquot
->dq_dqb
.dqb_curspace
-= number
;
1106 dquot
->dq_dqb
.dqb_curspace
= 0;
1107 if (dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1108 dquot
->dq_dqb
.dqb_btime
= (time_t) 0;
1109 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1113 struct super_block
*w_sb
;
1119 static int warning_issued(struct dquot
*dquot
, const int warntype
)
1121 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
1122 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
1123 ((warntype
== QUOTA_NL_IHARDWARN
||
1124 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
1128 return test_and_set_bit(flag
, &dquot
->dq_flags
);
1131 #ifdef CONFIG_PRINT_QUOTA_WARNING
1132 static int flag_print_warnings
= 1;
1134 static int need_print_warning(struct dquot_warn
*warn
)
1136 if (!flag_print_warnings
)
1139 switch (warn
->w_dq_type
) {
1141 return current_fsuid() == warn
->w_dq_id
;
1143 return in_group_p(warn
->w_dq_id
);
1148 /* Print warning to user which exceeded quota */
1149 static void print_warning(struct dquot_warn
*warn
)
1152 struct tty_struct
*tty
;
1153 int warntype
= warn
->w_type
;
1155 if (warntype
== QUOTA_NL_IHARDBELOW
||
1156 warntype
== QUOTA_NL_ISOFTBELOW
||
1157 warntype
== QUOTA_NL_BHARDBELOW
||
1158 warntype
== QUOTA_NL_BSOFTBELOW
|| !need_print_warning(warn
))
1161 tty
= get_current_tty();
1164 tty_write_message(tty
, warn
->w_sb
->s_id
);
1165 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
1166 tty_write_message(tty
, ": warning, ");
1168 tty_write_message(tty
, ": write failed, ");
1169 tty_write_message(tty
, quotatypes
[warn
->w_dq_type
]);
1171 case QUOTA_NL_IHARDWARN
:
1172 msg
= " file limit reached.\r\n";
1174 case QUOTA_NL_ISOFTLONGWARN
:
1175 msg
= " file quota exceeded too long.\r\n";
1177 case QUOTA_NL_ISOFTWARN
:
1178 msg
= " file quota exceeded.\r\n";
1180 case QUOTA_NL_BHARDWARN
:
1181 msg
= " block limit reached.\r\n";
1183 case QUOTA_NL_BSOFTLONGWARN
:
1184 msg
= " block quota exceeded too long.\r\n";
1186 case QUOTA_NL_BSOFTWARN
:
1187 msg
= " block quota exceeded.\r\n";
1190 tty_write_message(tty
, msg
);
1195 static void prepare_warning(struct dquot_warn
*warn
, struct dquot
*dquot
,
1198 if (warning_issued(dquot
, warntype
))
1200 warn
->w_type
= warntype
;
1201 warn
->w_sb
= dquot
->dq_sb
;
1202 warn
->w_dq_id
= dquot
->dq_id
;
1203 warn
->w_dq_type
= dquot
->dq_type
;
1207 * Write warnings to the console and send warning messages over netlink.
1209 * Note that this function can call into tty and networking code.
1211 static void flush_warnings(struct dquot_warn
*warn
)
1215 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1216 if (warn
[i
].w_type
== QUOTA_NL_NOWARN
)
1218 #ifdef CONFIG_PRINT_QUOTA_WARNING
1219 print_warning(&warn
[i
]);
1221 quota_send_warning(warn
[i
].w_dq_type
, warn
[i
].w_dq_id
,
1222 warn
[i
].w_sb
->s_dev
, warn
[i
].w_type
);
1226 static int ignore_hardlimit(struct dquot
*dquot
)
1228 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
1230 return capable(CAP_SYS_RESOURCE
) &&
1231 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
||
1232 !(info
->dqi_flags
& V1_DQF_RSQUASH
));
1235 /* needs dq_data_lock */
1236 static int check_idq(struct dquot
*dquot
, qsize_t inodes
,
1237 struct dquot_warn
*warn
)
1239 qsize_t newinodes
= dquot
->dq_dqb
.dqb_curinodes
+ inodes
;
1241 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
) ||
1242 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1245 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1246 newinodes
> dquot
->dq_dqb
.dqb_ihardlimit
&&
1247 !ignore_hardlimit(dquot
)) {
1248 prepare_warning(warn
, dquot
, QUOTA_NL_IHARDWARN
);
1252 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1253 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1254 dquot
->dq_dqb
.dqb_itime
&&
1255 get_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1256 !ignore_hardlimit(dquot
)) {
1257 prepare_warning(warn
, dquot
, QUOTA_NL_ISOFTLONGWARN
);
1261 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1262 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1263 dquot
->dq_dqb
.dqb_itime
== 0) {
1264 prepare_warning(warn
, dquot
, QUOTA_NL_ISOFTWARN
);
1265 dquot
->dq_dqb
.dqb_itime
= get_seconds() +
1266 sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_igrace
;
1272 /* needs dq_data_lock */
1273 static int check_bdq(struct dquot
*dquot
, qsize_t space
, int prealloc
,
1274 struct dquot_warn
*warn
)
1277 struct super_block
*sb
= dquot
->dq_sb
;
1279 if (!sb_has_quota_limits_enabled(sb
, dquot
->dq_type
) ||
1280 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1283 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
1286 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1287 tspace
> dquot
->dq_dqb
.dqb_bhardlimit
&&
1288 !ignore_hardlimit(dquot
)) {
1290 prepare_warning(warn
, dquot
, QUOTA_NL_BHARDWARN
);
1294 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1295 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1296 dquot
->dq_dqb
.dqb_btime
&&
1297 get_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1298 !ignore_hardlimit(dquot
)) {
1300 prepare_warning(warn
, dquot
, QUOTA_NL_BSOFTLONGWARN
);
1304 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1305 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1306 dquot
->dq_dqb
.dqb_btime
== 0) {
1308 prepare_warning(warn
, dquot
, QUOTA_NL_BSOFTWARN
);
1309 dquot
->dq_dqb
.dqb_btime
= get_seconds() +
1310 sb_dqopt(sb
)->info
[dquot
->dq_type
].dqi_bgrace
;
1314 * We don't allow preallocation to exceed softlimit so exceeding will
1323 static int info_idq_free(struct dquot
*dquot
, qsize_t inodes
)
1327 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1328 dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
||
1329 !sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
))
1330 return QUOTA_NL_NOWARN
;
1332 newinodes
= dquot
->dq_dqb
.dqb_curinodes
- inodes
;
1333 if (newinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1334 return QUOTA_NL_ISOFTBELOW
;
1335 if (dquot
->dq_dqb
.dqb_curinodes
>= dquot
->dq_dqb
.dqb_ihardlimit
&&
1336 newinodes
< dquot
->dq_dqb
.dqb_ihardlimit
)
1337 return QUOTA_NL_IHARDBELOW
;
1338 return QUOTA_NL_NOWARN
;
1341 static int info_bdq_free(struct dquot
*dquot
, qsize_t space
)
1343 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1344 dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1345 return QUOTA_NL_NOWARN
;
1347 if (dquot
->dq_dqb
.dqb_curspace
- space
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1348 return QUOTA_NL_BSOFTBELOW
;
1349 if (dquot
->dq_dqb
.dqb_curspace
>= dquot
->dq_dqb
.dqb_bhardlimit
&&
1350 dquot
->dq_dqb
.dqb_curspace
- space
< dquot
->dq_dqb
.dqb_bhardlimit
)
1351 return QUOTA_NL_BHARDBELOW
;
1352 return QUOTA_NL_NOWARN
;
1355 static int dquot_active(const struct inode
*inode
)
1357 struct super_block
*sb
= inode
->i_sb
;
1359 if (IS_NOQUOTA(inode
))
1361 return sb_any_quota_loaded(sb
) & ~sb_any_quota_suspended(sb
);
1365 * Initialize quota pointers in inode
1367 * We do things in a bit complicated way but by that we avoid calling
1368 * dqget() and thus filesystem callbacks under dqptr_sem.
1370 * It is better to call this function outside of any transaction as it
1371 * might need a lot of space in journal for dquot structure allocation.
1373 static void __dquot_initialize(struct inode
*inode
, int type
)
1375 unsigned int id
= 0;
1377 struct dquot
*got
[MAXQUOTAS
];
1378 struct super_block
*sb
= inode
->i_sb
;
1381 /* First test before acquiring mutex - solves deadlocks when we
1382 * re-enter the quota code and are already holding the mutex */
1383 if (!dquot_active(inode
))
1386 /* First get references to structures we might need. */
1387 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1389 if (type
!= -1 && cnt
!= type
)
1399 got
[cnt
] = dqget(sb
, id
, cnt
);
1402 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1403 if (IS_NOQUOTA(inode
))
1405 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1406 if (type
!= -1 && cnt
!= type
)
1408 /* Avoid races with quotaoff() */
1409 if (!sb_has_quota_active(sb
, cnt
))
1411 /* We could race with quotaon or dqget() could have failed */
1414 if (!inode
->i_dquot
[cnt
]) {
1415 inode
->i_dquot
[cnt
] = got
[cnt
];
1418 * Make quota reservation system happy if someone
1419 * did a write before quota was turned on
1421 rsv
= inode_get_rsv_space(inode
);
1423 dquot_resv_space(inode
->i_dquot
[cnt
], rsv
);
1427 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1428 /* Drop unused references */
1432 void dquot_initialize(struct inode
*inode
)
1434 __dquot_initialize(inode
, -1);
1436 EXPORT_SYMBOL(dquot_initialize
);
1439 * Release all quotas referenced by inode
1441 static void __dquot_drop(struct inode
*inode
)
1444 struct dquot
*put
[MAXQUOTAS
];
1446 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1447 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1448 put
[cnt
] = inode
->i_dquot
[cnt
];
1449 inode
->i_dquot
[cnt
] = NULL
;
1451 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1455 void dquot_drop(struct inode
*inode
)
1459 if (IS_NOQUOTA(inode
))
1463 * Test before calling to rule out calls from proc and such
1464 * where we are not allowed to block. Note that this is
1465 * actually reliable test even without the lock - the caller
1466 * must assure that nobody can come after the DQUOT_DROP and
1467 * add quota pointers back anyway.
1469 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1470 if (inode
->i_dquot
[cnt
])
1474 if (cnt
< MAXQUOTAS
)
1475 __dquot_drop(inode
);
1477 EXPORT_SYMBOL(dquot_drop
);
1480 * inode_reserved_space is managed internally by quota, and protected by
1481 * i_lock similar to i_blocks+i_bytes.
1483 static qsize_t
*inode_reserved_space(struct inode
* inode
)
1485 /* Filesystem must explicitly define it's own method in order to use
1486 * quota reservation interface */
1487 BUG_ON(!inode
->i_sb
->dq_op
->get_reserved_space
);
1488 return inode
->i_sb
->dq_op
->get_reserved_space(inode
);
1491 void inode_add_rsv_space(struct inode
*inode
, qsize_t number
)
1493 spin_lock(&inode
->i_lock
);
1494 *inode_reserved_space(inode
) += number
;
1495 spin_unlock(&inode
->i_lock
);
1497 EXPORT_SYMBOL(inode_add_rsv_space
);
1499 void inode_claim_rsv_space(struct inode
*inode
, qsize_t number
)
1501 spin_lock(&inode
->i_lock
);
1502 *inode_reserved_space(inode
) -= number
;
1503 __inode_add_bytes(inode
, number
);
1504 spin_unlock(&inode
->i_lock
);
1506 EXPORT_SYMBOL(inode_claim_rsv_space
);
1508 void inode_sub_rsv_space(struct inode
*inode
, qsize_t number
)
1510 spin_lock(&inode
->i_lock
);
1511 *inode_reserved_space(inode
) -= number
;
1512 spin_unlock(&inode
->i_lock
);
1514 EXPORT_SYMBOL(inode_sub_rsv_space
);
1516 static qsize_t
inode_get_rsv_space(struct inode
*inode
)
1520 if (!inode
->i_sb
->dq_op
->get_reserved_space
)
1522 spin_lock(&inode
->i_lock
);
1523 ret
= *inode_reserved_space(inode
);
1524 spin_unlock(&inode
->i_lock
);
1528 static void inode_incr_space(struct inode
*inode
, qsize_t number
,
1532 inode_add_rsv_space(inode
, number
);
1534 inode_add_bytes(inode
, number
);
1537 static void inode_decr_space(struct inode
*inode
, qsize_t number
, int reserve
)
1540 inode_sub_rsv_space(inode
, number
);
1542 inode_sub_bytes(inode
, number
);
1546 * This functions updates i_blocks+i_bytes fields and quota information
1547 * (together with appropriate checks).
1549 * NOTE: We absolutely rely on the fact that caller dirties the inode
1550 * (usually helpers in quotaops.h care about this) and holds a handle for
1551 * the current transaction so that dquot write and inode write go into the
1556 * This operation can block, but only after everything is updated
1558 int __dquot_alloc_space(struct inode
*inode
, qsize_t number
, int flags
)
1561 struct dquot_warn warn
[MAXQUOTAS
];
1562 struct dquot
**dquots
= inode
->i_dquot
;
1563 int reserve
= flags
& DQUOT_SPACE_RESERVE
;
1566 * First test before acquiring mutex - solves deadlocks when we
1567 * re-enter the quota code and are already holding the mutex
1569 if (!dquot_active(inode
)) {
1570 inode_incr_space(inode
, number
, reserve
);
1574 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1575 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1576 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1578 spin_lock(&dq_data_lock
);
1579 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1582 ret
= check_bdq(dquots
[cnt
], number
,
1583 !(flags
& DQUOT_SPACE_WARN
), &warn
[cnt
]);
1584 if (ret
&& !(flags
& DQUOT_SPACE_NOFAIL
)) {
1585 spin_unlock(&dq_data_lock
);
1586 goto out_flush_warn
;
1589 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1593 dquot_resv_space(dquots
[cnt
], number
);
1595 dquot_incr_space(dquots
[cnt
], number
);
1597 inode_incr_space(inode
, number
, reserve
);
1598 spin_unlock(&dq_data_lock
);
1601 goto out_flush_warn
;
1602 mark_all_dquot_dirty(dquots
);
1604 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1605 flush_warnings(warn
);
1609 EXPORT_SYMBOL(__dquot_alloc_space
);
1612 * This operation can block, but only after everything is updated
1614 int dquot_alloc_inode(const struct inode
*inode
)
1617 struct dquot_warn warn
[MAXQUOTAS
];
1618 struct dquot
* const *dquots
= inode
->i_dquot
;
1620 /* First test before acquiring mutex - solves deadlocks when we
1621 * re-enter the quota code and are already holding the mutex */
1622 if (!dquot_active(inode
))
1624 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1625 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1626 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1627 spin_lock(&dq_data_lock
);
1628 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1631 ret
= check_idq(dquots
[cnt
], 1, &warn
[cnt
]);
1636 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1639 dquot_incr_inodes(dquots
[cnt
], 1);
1643 spin_unlock(&dq_data_lock
);
1645 mark_all_dquot_dirty(dquots
);
1646 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1647 flush_warnings(warn
);
1650 EXPORT_SYMBOL(dquot_alloc_inode
);
1653 * Convert in-memory reserved quotas to real consumed quotas
1655 int dquot_claim_space_nodirty(struct inode
*inode
, qsize_t number
)
1659 if (!dquot_active(inode
)) {
1660 inode_claim_rsv_space(inode
, number
);
1664 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1665 spin_lock(&dq_data_lock
);
1666 /* Claim reserved quotas to allocated quotas */
1667 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1668 if (inode
->i_dquot
[cnt
])
1669 dquot_claim_reserved_space(inode
->i_dquot
[cnt
],
1672 /* Update inode bytes */
1673 inode_claim_rsv_space(inode
, number
);
1674 spin_unlock(&dq_data_lock
);
1675 mark_all_dquot_dirty(inode
->i_dquot
);
1676 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1679 EXPORT_SYMBOL(dquot_claim_space_nodirty
);
1682 * This operation can block, but only after everything is updated
1684 void __dquot_free_space(struct inode
*inode
, qsize_t number
, int flags
)
1687 struct dquot_warn warn
[MAXQUOTAS
];
1688 struct dquot
**dquots
= inode
->i_dquot
;
1689 int reserve
= flags
& DQUOT_SPACE_RESERVE
;
1691 /* First test before acquiring mutex - solves deadlocks when we
1692 * re-enter the quota code and are already holding the mutex */
1693 if (!dquot_active(inode
)) {
1694 inode_decr_space(inode
, number
, reserve
);
1698 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1699 spin_lock(&dq_data_lock
);
1700 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1703 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1706 wtype
= info_bdq_free(dquots
[cnt
], number
);
1707 if (wtype
!= QUOTA_NL_NOWARN
)
1708 prepare_warning(&warn
[cnt
], dquots
[cnt
], wtype
);
1710 dquot_free_reserved_space(dquots
[cnt
], number
);
1712 dquot_decr_space(dquots
[cnt
], number
);
1714 inode_decr_space(inode
, number
, reserve
);
1715 spin_unlock(&dq_data_lock
);
1719 mark_all_dquot_dirty(dquots
);
1721 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1722 flush_warnings(warn
);
1724 EXPORT_SYMBOL(__dquot_free_space
);
1727 * This operation can block, but only after everything is updated
1729 void dquot_free_inode(const struct inode
*inode
)
1732 struct dquot_warn warn
[MAXQUOTAS
];
1733 struct dquot
* const *dquots
= inode
->i_dquot
;
1735 /* First test before acquiring mutex - solves deadlocks when we
1736 * re-enter the quota code and are already holding the mutex */
1737 if (!dquot_active(inode
))
1740 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1741 spin_lock(&dq_data_lock
);
1742 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1745 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1748 wtype
= info_idq_free(dquots
[cnt
], 1);
1749 if (wtype
!= QUOTA_NL_NOWARN
)
1750 prepare_warning(&warn
[cnt
], dquots
[cnt
], wtype
);
1751 dquot_decr_inodes(dquots
[cnt
], 1);
1753 spin_unlock(&dq_data_lock
);
1754 mark_all_dquot_dirty(dquots
);
1755 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1756 flush_warnings(warn
);
1758 EXPORT_SYMBOL(dquot_free_inode
);
1761 * Transfer the number of inode and blocks from one diskquota to an other.
1762 * On success, dquot references in transfer_to are consumed and references
1763 * to original dquots that need to be released are placed there. On failure,
1764 * references are kept untouched.
1766 * This operation can block, but only after everything is updated
1767 * A transaction must be started when entering this function.
1770 int __dquot_transfer(struct inode
*inode
, struct dquot
**transfer_to
)
1772 qsize_t space
, cur_space
;
1773 qsize_t rsv_space
= 0;
1774 struct dquot
*transfer_from
[MAXQUOTAS
] = {};
1776 char is_valid
[MAXQUOTAS
] = {};
1777 struct dquot_warn warn_to
[MAXQUOTAS
];
1778 struct dquot_warn warn_from_inodes
[MAXQUOTAS
];
1779 struct dquot_warn warn_from_space
[MAXQUOTAS
];
1781 /* First test before acquiring mutex - solves deadlocks when we
1782 * re-enter the quota code and are already holding the mutex */
1783 if (IS_NOQUOTA(inode
))
1785 /* Initialize the arrays */
1786 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1787 warn_to
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1788 warn_from_inodes
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1789 warn_from_space
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1791 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1792 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1793 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1796 spin_lock(&dq_data_lock
);
1797 cur_space
= inode_get_bytes(inode
);
1798 rsv_space
= inode_get_rsv_space(inode
);
1799 space
= cur_space
+ rsv_space
;
1800 /* Build the transfer_from list and check the limits */
1801 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1803 * Skip changes for same uid or gid or for turned off quota-type.
1805 if (!transfer_to
[cnt
])
1807 /* Avoid races with quotaoff() */
1808 if (!sb_has_quota_active(inode
->i_sb
, cnt
))
1811 transfer_from
[cnt
] = inode
->i_dquot
[cnt
];
1812 ret
= check_idq(transfer_to
[cnt
], 1, &warn_to
[cnt
]);
1815 ret
= check_bdq(transfer_to
[cnt
], space
, 0, &warn_to
[cnt
]);
1821 * Finally perform the needed transfer from transfer_from to transfer_to
1823 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1826 /* Due to IO error we might not have transfer_from[] structure */
1827 if (transfer_from
[cnt
]) {
1829 wtype
= info_idq_free(transfer_from
[cnt
], 1);
1830 if (wtype
!= QUOTA_NL_NOWARN
)
1831 prepare_warning(&warn_from_inodes
[cnt
],
1832 transfer_from
[cnt
], wtype
);
1833 wtype
= info_bdq_free(transfer_from
[cnt
], space
);
1834 if (wtype
!= QUOTA_NL_NOWARN
)
1835 prepare_warning(&warn_from_space
[cnt
],
1836 transfer_from
[cnt
], wtype
);
1837 dquot_decr_inodes(transfer_from
[cnt
], 1);
1838 dquot_decr_space(transfer_from
[cnt
], cur_space
);
1839 dquot_free_reserved_space(transfer_from
[cnt
],
1843 dquot_incr_inodes(transfer_to
[cnt
], 1);
1844 dquot_incr_space(transfer_to
[cnt
], cur_space
);
1845 dquot_resv_space(transfer_to
[cnt
], rsv_space
);
1847 inode
->i_dquot
[cnt
] = transfer_to
[cnt
];
1849 spin_unlock(&dq_data_lock
);
1850 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1852 mark_all_dquot_dirty(transfer_from
);
1853 mark_all_dquot_dirty(transfer_to
);
1854 flush_warnings(warn_to
);
1855 flush_warnings(warn_from_inodes
);
1856 flush_warnings(warn_from_space
);
1857 /* Pass back references to put */
1858 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1860 transfer_to
[cnt
] = transfer_from
[cnt
];
1863 spin_unlock(&dq_data_lock
);
1864 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1865 flush_warnings(warn_to
);
1868 EXPORT_SYMBOL(__dquot_transfer
);
1870 /* Wrapper for transferring ownership of an inode for uid/gid only
1871 * Called from FSXXX_setattr()
1873 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
1875 struct dquot
*transfer_to
[MAXQUOTAS
] = {};
1876 struct super_block
*sb
= inode
->i_sb
;
1879 if (!dquot_active(inode
))
1882 if (iattr
->ia_valid
& ATTR_UID
&& iattr
->ia_uid
!= inode
->i_uid
)
1883 transfer_to
[USRQUOTA
] = dqget(sb
, iattr
->ia_uid
, USRQUOTA
);
1884 if (iattr
->ia_valid
& ATTR_GID
&& iattr
->ia_gid
!= inode
->i_gid
)
1885 transfer_to
[GRPQUOTA
] = dqget(sb
, iattr
->ia_gid
, GRPQUOTA
);
1887 ret
= __dquot_transfer(inode
, transfer_to
);
1888 dqput_all(transfer_to
);
1891 EXPORT_SYMBOL(dquot_transfer
);
1894 * Write info of quota file to disk
1896 int dquot_commit_info(struct super_block
*sb
, int type
)
1899 struct quota_info
*dqopt
= sb_dqopt(sb
);
1901 mutex_lock(&dqopt
->dqio_mutex
);
1902 ret
= dqopt
->ops
[type
]->write_file_info(sb
, type
);
1903 mutex_unlock(&dqopt
->dqio_mutex
);
1906 EXPORT_SYMBOL(dquot_commit_info
);
1909 * Definitions of diskquota operations.
1911 const struct dquot_operations dquot_operations
= {
1912 .write_dquot
= dquot_commit
,
1913 .acquire_dquot
= dquot_acquire
,
1914 .release_dquot
= dquot_release
,
1915 .mark_dirty
= dquot_mark_dquot_dirty
,
1916 .write_info
= dquot_commit_info
,
1917 .alloc_dquot
= dquot_alloc
,
1918 .destroy_dquot
= dquot_destroy
,
1920 EXPORT_SYMBOL(dquot_operations
);
1923 * Generic helper for ->open on filesystems supporting disk quotas.
1925 int dquot_file_open(struct inode
*inode
, struct file
*file
)
1929 error
= generic_file_open(inode
, file
);
1930 if (!error
&& (file
->f_mode
& FMODE_WRITE
))
1931 dquot_initialize(inode
);
1934 EXPORT_SYMBOL(dquot_file_open
);
1937 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1939 int dquot_disable(struct super_block
*sb
, int type
, unsigned int flags
)
1942 struct quota_info
*dqopt
= sb_dqopt(sb
);
1943 struct inode
*toputinode
[MAXQUOTAS
];
1945 /* Cannot turn off usage accounting without turning off limits, or
1946 * suspend quotas and simultaneously turn quotas off. */
1947 if ((flags
& DQUOT_USAGE_ENABLED
&& !(flags
& DQUOT_LIMITS_ENABLED
))
1948 || (flags
& DQUOT_SUSPENDED
&& flags
& (DQUOT_LIMITS_ENABLED
|
1949 DQUOT_USAGE_ENABLED
)))
1952 /* We need to serialize quota_off() for device */
1953 mutex_lock(&dqopt
->dqonoff_mutex
);
1956 * Skip everything if there's nothing to do. We have to do this because
1957 * sometimes we are called when fill_super() failed and calling
1958 * sync_fs() in such cases does no good.
1960 if (!sb_any_quota_loaded(sb
)) {
1961 mutex_unlock(&dqopt
->dqonoff_mutex
);
1964 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1965 toputinode
[cnt
] = NULL
;
1966 if (type
!= -1 && cnt
!= type
)
1968 if (!sb_has_quota_loaded(sb
, cnt
))
1971 if (flags
& DQUOT_SUSPENDED
) {
1972 spin_lock(&dq_state_lock
);
1974 dquot_state_flag(DQUOT_SUSPENDED
, cnt
);
1975 spin_unlock(&dq_state_lock
);
1977 spin_lock(&dq_state_lock
);
1978 dqopt
->flags
&= ~dquot_state_flag(flags
, cnt
);
1979 /* Turning off suspended quotas? */
1980 if (!sb_has_quota_loaded(sb
, cnt
) &&
1981 sb_has_quota_suspended(sb
, cnt
)) {
1982 dqopt
->flags
&= ~dquot_state_flag(
1983 DQUOT_SUSPENDED
, cnt
);
1984 spin_unlock(&dq_state_lock
);
1985 iput(dqopt
->files
[cnt
]);
1986 dqopt
->files
[cnt
] = NULL
;
1989 spin_unlock(&dq_state_lock
);
1992 /* We still have to keep quota loaded? */
1993 if (sb_has_quota_loaded(sb
, cnt
) && !(flags
& DQUOT_SUSPENDED
))
1996 /* Note: these are blocking operations */
1997 drop_dquot_ref(sb
, cnt
);
1998 invalidate_dquots(sb
, cnt
);
2000 * Now all dquots should be invalidated, all writes done so we
2001 * should be only users of the info. No locks needed.
2003 if (info_dirty(&dqopt
->info
[cnt
]))
2004 sb
->dq_op
->write_info(sb
, cnt
);
2005 if (dqopt
->ops
[cnt
]->free_file_info
)
2006 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
2007 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
2009 toputinode
[cnt
] = dqopt
->files
[cnt
];
2010 if (!sb_has_quota_loaded(sb
, cnt
))
2011 dqopt
->files
[cnt
] = NULL
;
2012 dqopt
->info
[cnt
].dqi_flags
= 0;
2013 dqopt
->info
[cnt
].dqi_igrace
= 0;
2014 dqopt
->info
[cnt
].dqi_bgrace
= 0;
2015 dqopt
->ops
[cnt
] = NULL
;
2017 mutex_unlock(&dqopt
->dqonoff_mutex
);
2019 /* Skip syncing and setting flags if quota files are hidden */
2020 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
2023 /* Sync the superblock so that buffers with quota data are written to
2024 * disk (and so userspace sees correct data afterwards). */
2025 if (sb
->s_op
->sync_fs
)
2026 sb
->s_op
->sync_fs(sb
, 1);
2027 sync_blockdev(sb
->s_bdev
);
2028 /* Now the quota files are just ordinary files and we can set the
2029 * inode flags back. Moreover we discard the pagecache so that
2030 * userspace sees the writes we did bypassing the pagecache. We
2031 * must also discard the blockdev buffers so that we see the
2032 * changes done by userspace on the next quotaon() */
2033 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2034 if (toputinode
[cnt
]) {
2035 mutex_lock(&dqopt
->dqonoff_mutex
);
2036 /* If quota was reenabled in the meantime, we have
2038 if (!sb_has_quota_loaded(sb
, cnt
)) {
2039 mutex_lock(&toputinode
[cnt
]->i_mutex
);
2040 toputinode
[cnt
]->i_flags
&= ~(S_IMMUTABLE
|
2041 S_NOATIME
| S_NOQUOTA
);
2042 truncate_inode_pages(&toputinode
[cnt
]->i_data
,
2044 mutex_unlock(&toputinode
[cnt
]->i_mutex
);
2045 mark_inode_dirty_sync(toputinode
[cnt
]);
2047 mutex_unlock(&dqopt
->dqonoff_mutex
);
2050 invalidate_bdev(sb
->s_bdev
);
2052 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2053 if (toputinode
[cnt
]) {
2054 /* On remount RO, we keep the inode pointer so that we
2055 * can reenable quota on the subsequent remount RW. We
2056 * have to check 'flags' variable and not use sb_has_
2057 * function because another quotaon / quotaoff could
2058 * change global state before we got here. We refuse
2059 * to suspend quotas when there is pending delete on
2060 * the quota file... */
2061 if (!(flags
& DQUOT_SUSPENDED
))
2062 iput(toputinode
[cnt
]);
2063 else if (!toputinode
[cnt
]->i_nlink
)
2068 EXPORT_SYMBOL(dquot_disable
);
2070 int dquot_quota_off(struct super_block
*sb
, int type
)
2072 return dquot_disable(sb
, type
,
2073 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2075 EXPORT_SYMBOL(dquot_quota_off
);
2078 * Turn quotas on on a device
2082 * Helper function to turn quotas on when we already have the inode of
2083 * quota file and no quota information is loaded.
2085 static int vfs_load_quota_inode(struct inode
*inode
, int type
, int format_id
,
2088 struct quota_format_type
*fmt
= find_quota_format(format_id
);
2089 struct super_block
*sb
= inode
->i_sb
;
2090 struct quota_info
*dqopt
= sb_dqopt(sb
);
2096 if (!S_ISREG(inode
->i_mode
)) {
2100 if (IS_RDONLY(inode
)) {
2104 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
) {
2108 /* Usage always has to be set... */
2109 if (!(flags
& DQUOT_USAGE_ENABLED
)) {
2114 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2115 /* As we bypass the pagecache we must now flush all the
2116 * dirty data and invalidate caches so that kernel sees
2117 * changes from userspace. It is not enough to just flush
2118 * the quota file since if blocksize < pagesize, invalidation
2119 * of the cache could fail because of other unrelated dirty
2121 sync_filesystem(sb
);
2122 invalidate_bdev(sb
->s_bdev
);
2124 mutex_lock(&dqopt
->dqonoff_mutex
);
2125 if (sb_has_quota_loaded(sb
, type
)) {
2130 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2131 /* We don't want quota and atime on quota files (deadlocks
2132 * possible) Also nobody should write to the file - we use
2133 * special IO operations which ignore the immutable bit. */
2134 mutex_lock(&inode
->i_mutex
);
2135 oldflags
= inode
->i_flags
& (S_NOATIME
| S_IMMUTABLE
|
2137 inode
->i_flags
|= S_NOQUOTA
| S_NOATIME
| S_IMMUTABLE
;
2138 mutex_unlock(&inode
->i_mutex
);
2140 * When S_NOQUOTA is set, remove dquot references as no more
2141 * references can be added
2143 __dquot_drop(inode
);
2147 dqopt
->files
[type
] = igrab(inode
);
2148 if (!dqopt
->files
[type
])
2151 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
2154 dqopt
->ops
[type
] = fmt
->qf_ops
;
2155 dqopt
->info
[type
].dqi_format
= fmt
;
2156 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
2157 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
2158 mutex_lock(&dqopt
->dqio_mutex
);
2159 error
= dqopt
->ops
[type
]->read_file_info(sb
, type
);
2161 mutex_unlock(&dqopt
->dqio_mutex
);
2164 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
2165 dqopt
->info
[type
].dqi_flags
|= DQF_SYS_FILE
;
2166 mutex_unlock(&dqopt
->dqio_mutex
);
2167 spin_lock(&dq_state_lock
);
2168 dqopt
->flags
|= dquot_state_flag(flags
, type
);
2169 spin_unlock(&dq_state_lock
);
2171 add_dquot_ref(sb
, type
);
2172 mutex_unlock(&dqopt
->dqonoff_mutex
);
2177 dqopt
->files
[type
] = NULL
;
2180 if (oldflags
!= -1) {
2181 mutex_lock(&inode
->i_mutex
);
2182 /* Set the flags back (in the case of accidental quotaon()
2183 * on a wrong file we don't want to mess up the flags) */
2184 inode
->i_flags
&= ~(S_NOATIME
| S_NOQUOTA
| S_IMMUTABLE
);
2185 inode
->i_flags
|= oldflags
;
2186 mutex_unlock(&inode
->i_mutex
);
2188 mutex_unlock(&dqopt
->dqonoff_mutex
);
2190 put_quota_format(fmt
);
2195 /* Reenable quotas on remount RW */
2196 int dquot_resume(struct super_block
*sb
, int type
)
2198 struct quota_info
*dqopt
= sb_dqopt(sb
);
2199 struct inode
*inode
;
2203 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2204 if (type
!= -1 && cnt
!= type
)
2207 mutex_lock(&dqopt
->dqonoff_mutex
);
2208 if (!sb_has_quota_suspended(sb
, cnt
)) {
2209 mutex_unlock(&dqopt
->dqonoff_mutex
);
2212 inode
= dqopt
->files
[cnt
];
2213 dqopt
->files
[cnt
] = NULL
;
2214 spin_lock(&dq_state_lock
);
2215 flags
= dqopt
->flags
& dquot_state_flag(DQUOT_USAGE_ENABLED
|
2216 DQUOT_LIMITS_ENABLED
,
2218 dqopt
->flags
&= ~dquot_state_flag(DQUOT_STATE_FLAGS
, cnt
);
2219 spin_unlock(&dq_state_lock
);
2220 mutex_unlock(&dqopt
->dqonoff_mutex
);
2222 flags
= dquot_generic_flag(flags
, cnt
);
2223 ret
= vfs_load_quota_inode(inode
, cnt
,
2224 dqopt
->info
[cnt
].dqi_fmt_id
, flags
);
2230 EXPORT_SYMBOL(dquot_resume
);
2232 int dquot_quota_on(struct super_block
*sb
, int type
, int format_id
,
2235 int error
= security_quota_on(path
->dentry
);
2238 /* Quota file not on the same filesystem? */
2239 if (path
->dentry
->d_sb
!= sb
)
2242 error
= vfs_load_quota_inode(path
->dentry
->d_inode
, type
,
2243 format_id
, DQUOT_USAGE_ENABLED
|
2244 DQUOT_LIMITS_ENABLED
);
2247 EXPORT_SYMBOL(dquot_quota_on
);
2250 * More powerful function for turning on quotas allowing setting
2251 * of individual quota flags
2253 int dquot_enable(struct inode
*inode
, int type
, int format_id
,
2257 struct super_block
*sb
= inode
->i_sb
;
2258 struct quota_info
*dqopt
= sb_dqopt(sb
);
2260 /* Just unsuspend quotas? */
2261 BUG_ON(flags
& DQUOT_SUSPENDED
);
2265 /* Just updating flags needed? */
2266 if (sb_has_quota_loaded(sb
, type
)) {
2267 mutex_lock(&dqopt
->dqonoff_mutex
);
2268 /* Now do a reliable test... */
2269 if (!sb_has_quota_loaded(sb
, type
)) {
2270 mutex_unlock(&dqopt
->dqonoff_mutex
);
2273 if (flags
& DQUOT_USAGE_ENABLED
&&
2274 sb_has_quota_usage_enabled(sb
, type
)) {
2278 if (flags
& DQUOT_LIMITS_ENABLED
&&
2279 sb_has_quota_limits_enabled(sb
, type
)) {
2283 spin_lock(&dq_state_lock
);
2284 sb_dqopt(sb
)->flags
|= dquot_state_flag(flags
, type
);
2285 spin_unlock(&dq_state_lock
);
2287 mutex_unlock(&dqopt
->dqonoff_mutex
);
2292 return vfs_load_quota_inode(inode
, type
, format_id
, flags
);
2294 EXPORT_SYMBOL(dquot_enable
);
2297 * This function is used when filesystem needs to initialize quotas
2298 * during mount time.
2300 int dquot_quota_on_mount(struct super_block
*sb
, char *qf_name
,
2301 int format_id
, int type
)
2303 struct dentry
*dentry
;
2306 mutex_lock(&sb
->s_root
->d_inode
->i_mutex
);
2307 dentry
= lookup_one_len(qf_name
, sb
->s_root
, strlen(qf_name
));
2308 mutex_unlock(&sb
->s_root
->d_inode
->i_mutex
);
2310 return PTR_ERR(dentry
);
2312 if (!dentry
->d_inode
) {
2317 error
= security_quota_on(dentry
);
2319 error
= vfs_load_quota_inode(dentry
->d_inode
, type
, format_id
,
2320 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2326 EXPORT_SYMBOL(dquot_quota_on_mount
);
2328 static inline qsize_t
qbtos(qsize_t blocks
)
2330 return blocks
<< QIF_DQBLKSIZE_BITS
;
2333 static inline qsize_t
stoqb(qsize_t space
)
2335 return (space
+ QIF_DQBLKSIZE
- 1) >> QIF_DQBLKSIZE_BITS
;
2338 /* Generic routine for getting common part of quota structure */
2339 static void do_get_dqblk(struct dquot
*dquot
, struct fs_disk_quota
*di
)
2341 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2343 memset(di
, 0, sizeof(*di
));
2344 di
->d_version
= FS_DQUOT_VERSION
;
2345 di
->d_flags
= dquot
->dq_type
== USRQUOTA
?
2346 FS_USER_QUOTA
: FS_GROUP_QUOTA
;
2347 di
->d_id
= dquot
->dq_id
;
2349 spin_lock(&dq_data_lock
);
2350 di
->d_blk_hardlimit
= stoqb(dm
->dqb_bhardlimit
);
2351 di
->d_blk_softlimit
= stoqb(dm
->dqb_bsoftlimit
);
2352 di
->d_ino_hardlimit
= dm
->dqb_ihardlimit
;
2353 di
->d_ino_softlimit
= dm
->dqb_isoftlimit
;
2354 di
->d_bcount
= dm
->dqb_curspace
+ dm
->dqb_rsvspace
;
2355 di
->d_icount
= dm
->dqb_curinodes
;
2356 di
->d_btimer
= dm
->dqb_btime
;
2357 di
->d_itimer
= dm
->dqb_itime
;
2358 spin_unlock(&dq_data_lock
);
2361 int dquot_get_dqblk(struct super_block
*sb
, int type
, qid_t id
,
2362 struct fs_disk_quota
*di
)
2364 struct dquot
*dquot
;
2366 dquot
= dqget(sb
, id
, type
);
2369 do_get_dqblk(dquot
, di
);
2374 EXPORT_SYMBOL(dquot_get_dqblk
);
2376 #define VFS_FS_DQ_MASK \
2377 (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \
2378 FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \
2379 FS_DQ_BTIMER | FS_DQ_ITIMER)
2381 /* Generic routine for setting common part of quota structure */
2382 static int do_set_dqblk(struct dquot
*dquot
, struct fs_disk_quota
*di
)
2384 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2385 int check_blim
= 0, check_ilim
= 0;
2386 struct mem_dqinfo
*dqi
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
2388 if (di
->d_fieldmask
& ~VFS_FS_DQ_MASK
)
2391 if (((di
->d_fieldmask
& FS_DQ_BSOFT
) &&
2392 (di
->d_blk_softlimit
> dqi
->dqi_maxblimit
)) ||
2393 ((di
->d_fieldmask
& FS_DQ_BHARD
) &&
2394 (di
->d_blk_hardlimit
> dqi
->dqi_maxblimit
)) ||
2395 ((di
->d_fieldmask
& FS_DQ_ISOFT
) &&
2396 (di
->d_ino_softlimit
> dqi
->dqi_maxilimit
)) ||
2397 ((di
->d_fieldmask
& FS_DQ_IHARD
) &&
2398 (di
->d_ino_hardlimit
> dqi
->dqi_maxilimit
)))
2401 spin_lock(&dq_data_lock
);
2402 if (di
->d_fieldmask
& FS_DQ_BCOUNT
) {
2403 dm
->dqb_curspace
= di
->d_bcount
- dm
->dqb_rsvspace
;
2405 set_bit(DQ_LASTSET_B
+ QIF_SPACE_B
, &dquot
->dq_flags
);
2408 if (di
->d_fieldmask
& FS_DQ_BSOFT
)
2409 dm
->dqb_bsoftlimit
= qbtos(di
->d_blk_softlimit
);
2410 if (di
->d_fieldmask
& FS_DQ_BHARD
)
2411 dm
->dqb_bhardlimit
= qbtos(di
->d_blk_hardlimit
);
2412 if (di
->d_fieldmask
& (FS_DQ_BSOFT
| FS_DQ_BHARD
)) {
2414 set_bit(DQ_LASTSET_B
+ QIF_BLIMITS_B
, &dquot
->dq_flags
);
2417 if (di
->d_fieldmask
& FS_DQ_ICOUNT
) {
2418 dm
->dqb_curinodes
= di
->d_icount
;
2420 set_bit(DQ_LASTSET_B
+ QIF_INODES_B
, &dquot
->dq_flags
);
2423 if (di
->d_fieldmask
& FS_DQ_ISOFT
)
2424 dm
->dqb_isoftlimit
= di
->d_ino_softlimit
;
2425 if (di
->d_fieldmask
& FS_DQ_IHARD
)
2426 dm
->dqb_ihardlimit
= di
->d_ino_hardlimit
;
2427 if (di
->d_fieldmask
& (FS_DQ_ISOFT
| FS_DQ_IHARD
)) {
2429 set_bit(DQ_LASTSET_B
+ QIF_ILIMITS_B
, &dquot
->dq_flags
);
2432 if (di
->d_fieldmask
& FS_DQ_BTIMER
) {
2433 dm
->dqb_btime
= di
->d_btimer
;
2435 set_bit(DQ_LASTSET_B
+ QIF_BTIME_B
, &dquot
->dq_flags
);
2438 if (di
->d_fieldmask
& FS_DQ_ITIMER
) {
2439 dm
->dqb_itime
= di
->d_itimer
;
2441 set_bit(DQ_LASTSET_B
+ QIF_ITIME_B
, &dquot
->dq_flags
);
2445 if (!dm
->dqb_bsoftlimit
||
2446 dm
->dqb_curspace
< dm
->dqb_bsoftlimit
) {
2448 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
2449 } else if (!(di
->d_fieldmask
& FS_DQ_BTIMER
))
2450 /* Set grace only if user hasn't provided his own... */
2451 dm
->dqb_btime
= get_seconds() + dqi
->dqi_bgrace
;
2454 if (!dm
->dqb_isoftlimit
||
2455 dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
2457 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
2458 } else if (!(di
->d_fieldmask
& FS_DQ_ITIMER
))
2459 /* Set grace only if user hasn't provided his own... */
2460 dm
->dqb_itime
= get_seconds() + dqi
->dqi_igrace
;
2462 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
||
2464 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2466 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2467 spin_unlock(&dq_data_lock
);
2468 mark_dquot_dirty(dquot
);
2473 int dquot_set_dqblk(struct super_block
*sb
, int type
, qid_t id
,
2474 struct fs_disk_quota
*di
)
2476 struct dquot
*dquot
;
2479 dquot
= dqget(sb
, id
, type
);
2484 rc
= do_set_dqblk(dquot
, di
);
2489 EXPORT_SYMBOL(dquot_set_dqblk
);
2491 /* Generic routine for getting common part of quota file information */
2492 int dquot_get_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2494 struct mem_dqinfo
*mi
;
2496 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2497 if (!sb_has_quota_active(sb
, type
)) {
2498 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2501 mi
= sb_dqopt(sb
)->info
+ type
;
2502 spin_lock(&dq_data_lock
);
2503 ii
->dqi_bgrace
= mi
->dqi_bgrace
;
2504 ii
->dqi_igrace
= mi
->dqi_igrace
;
2505 ii
->dqi_flags
= mi
->dqi_flags
& DQF_GETINFO_MASK
;
2506 ii
->dqi_valid
= IIF_ALL
;
2507 spin_unlock(&dq_data_lock
);
2508 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2511 EXPORT_SYMBOL(dquot_get_dqinfo
);
2513 /* Generic routine for setting common part of quota file information */
2514 int dquot_set_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2516 struct mem_dqinfo
*mi
;
2519 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2520 if (!sb_has_quota_active(sb
, type
)) {
2524 mi
= sb_dqopt(sb
)->info
+ type
;
2525 spin_lock(&dq_data_lock
);
2526 if (ii
->dqi_valid
& IIF_BGRACE
)
2527 mi
->dqi_bgrace
= ii
->dqi_bgrace
;
2528 if (ii
->dqi_valid
& IIF_IGRACE
)
2529 mi
->dqi_igrace
= ii
->dqi_igrace
;
2530 if (ii
->dqi_valid
& IIF_FLAGS
)
2531 mi
->dqi_flags
= (mi
->dqi_flags
& ~DQF_SETINFO_MASK
) |
2532 (ii
->dqi_flags
& DQF_SETINFO_MASK
);
2533 spin_unlock(&dq_data_lock
);
2534 mark_info_dirty(sb
, type
);
2535 /* Force write to disk */
2536 sb
->dq_op
->write_info(sb
, type
);
2538 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2541 EXPORT_SYMBOL(dquot_set_dqinfo
);
2543 const struct quotactl_ops dquot_quotactl_ops
= {
2544 .quota_on
= dquot_quota_on
,
2545 .quota_off
= dquot_quota_off
,
2546 .quota_sync
= dquot_quota_sync
,
2547 .get_info
= dquot_get_dqinfo
,
2548 .set_info
= dquot_set_dqinfo
,
2549 .get_dqblk
= dquot_get_dqblk
,
2550 .set_dqblk
= dquot_set_dqblk
2552 EXPORT_SYMBOL(dquot_quotactl_ops
);
2554 static int do_proc_dqstats(struct ctl_table
*table
, int write
,
2555 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2557 unsigned int type
= (int *)table
->data
- dqstats
.stat
;
2559 /* Update global table */
2560 dqstats
.stat
[type
] =
2561 percpu_counter_sum_positive(&dqstats
.counter
[type
]);
2562 return proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
2565 static ctl_table fs_dqstats_table
[] = {
2567 .procname
= "lookups",
2568 .data
= &dqstats
.stat
[DQST_LOOKUPS
],
2569 .maxlen
= sizeof(int),
2571 .proc_handler
= do_proc_dqstats
,
2574 .procname
= "drops",
2575 .data
= &dqstats
.stat
[DQST_DROPS
],
2576 .maxlen
= sizeof(int),
2578 .proc_handler
= do_proc_dqstats
,
2581 .procname
= "reads",
2582 .data
= &dqstats
.stat
[DQST_READS
],
2583 .maxlen
= sizeof(int),
2585 .proc_handler
= do_proc_dqstats
,
2588 .procname
= "writes",
2589 .data
= &dqstats
.stat
[DQST_WRITES
],
2590 .maxlen
= sizeof(int),
2592 .proc_handler
= do_proc_dqstats
,
2595 .procname
= "cache_hits",
2596 .data
= &dqstats
.stat
[DQST_CACHE_HITS
],
2597 .maxlen
= sizeof(int),
2599 .proc_handler
= do_proc_dqstats
,
2602 .procname
= "allocated_dquots",
2603 .data
= &dqstats
.stat
[DQST_ALLOC_DQUOTS
],
2604 .maxlen
= sizeof(int),
2606 .proc_handler
= do_proc_dqstats
,
2609 .procname
= "free_dquots",
2610 .data
= &dqstats
.stat
[DQST_FREE_DQUOTS
],
2611 .maxlen
= sizeof(int),
2613 .proc_handler
= do_proc_dqstats
,
2616 .procname
= "syncs",
2617 .data
= &dqstats
.stat
[DQST_SYNCS
],
2618 .maxlen
= sizeof(int),
2620 .proc_handler
= do_proc_dqstats
,
2622 #ifdef CONFIG_PRINT_QUOTA_WARNING
2624 .procname
= "warnings",
2625 .data
= &flag_print_warnings
,
2626 .maxlen
= sizeof(int),
2628 .proc_handler
= proc_dointvec
,
2634 static ctl_table fs_table
[] = {
2636 .procname
= "quota",
2638 .child
= fs_dqstats_table
,
2643 static ctl_table sys_table
[] = {
2652 static int __init
dquot_init(void)
2655 unsigned long nr_hash
, order
;
2657 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2659 register_sysctl_table(sys_table
);
2661 dquot_cachep
= kmem_cache_create("dquot",
2662 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2663 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2664 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2668 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
2670 panic("Cannot create dquot hash table");
2672 for (i
= 0; i
< _DQST_DQSTAT_LAST
; i
++) {
2673 ret
= percpu_counter_init(&dqstats
.counter
[i
], 0);
2675 panic("Cannot create dquot stat counters");
2678 /* Find power-of-two hlist_heads which can fit into allocation */
2679 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2683 } while (nr_hash
>> dq_hash_bits
);
2686 nr_hash
= 1UL << dq_hash_bits
;
2687 dq_hash_mask
= nr_hash
- 1;
2688 for (i
= 0; i
< nr_hash
; i
++)
2689 INIT_HLIST_HEAD(dquot_hash
+ i
);
2691 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2692 nr_hash
, order
, (PAGE_SIZE
<< order
));
2694 register_shrinker(&dqcache_shrinker
);
2698 module_init(dquot_init
);