2 * Implementation of the diskquota system for the LINUX operating system. QUOTA
3 * is implemented using the BSD system call interface as the means of
4 * communication with the user level. This file contains the generic routines
5 * called by the different filesystems on allocation of an inode or block.
6 * These routines take care of the administration needed to have a consistent
7 * diskquota tracking system. The ideas of both user and group quotas are based
8 * on the Melbourne quota system as used on BSD derived systems. The internal
9 * implementation is based on one of the several variants of the LINUX
10 * inode-subsystem with added complexity of the diskquota system.
12 * Author: Marco van Wieringen <mvw@planets.elm.net>
14 * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
16 * Revised list management to avoid races
17 * -- Bill Hawes, <whawes@star.net>, 9/98
19 * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
20 * As the consequence the locking was moved from dquot_decr_...(),
21 * dquot_incr_...() to calling functions.
22 * invalidate_dquots() now writes modified dquots.
23 * Serialized quota_off() and quota_on() for mount point.
24 * Fixed a few bugs in grow_dquots().
25 * Fixed deadlock in write_dquot() - we no longer account quotas on
27 * remove_dquot_ref() moved to inode.c - it now traverses through inodes
28 * add_dquot_ref() restarts after blocking
29 * Added check for bogus uid and fixed check for group in quotactl.
30 * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
32 * Used struct list_head instead of own list struct
33 * Invalidation of referenced dquots is no longer possible
34 * Improved free_dquots list management
35 * Quota and i_blocks are now updated in one place to avoid races
36 * Warnings are now delayed so we won't block in critical section
37 * Write updated not to require dquot lock
38 * Jan Kara, <jack@suse.cz>, 9/2000
40 * Added dynamic quota structure allocation
41 * Jan Kara <jack@suse.cz> 12/2000
43 * Rewritten quota interface. Implemented new quota format and
44 * formats registering.
45 * Jan Kara, <jack@suse.cz>, 2001,2002
48 * Jan Kara, <jack@suse.cz>, 10/2002
50 * Added journalled quota support, fix lock inversion problems
51 * Jan Kara, <jack@suse.cz>, 2003,2004
53 * (C) Copyright 1994 - 1997 Marco van Wieringen
56 #include <linux/errno.h>
57 #include <linux/kernel.h>
59 #include <linux/mount.h>
61 #include <linux/time.h>
62 #include <linux/types.h>
63 #include <linux/string.h>
64 #include <linux/fcntl.h>
65 #include <linux/stat.h>
66 #include <linux/tty.h>
67 #include <linux/file.h>
68 #include <linux/slab.h>
69 #include <linux/sysctl.h>
70 #include <linux/init.h>
71 #include <linux/module.h>
72 #include <linux/proc_fs.h>
73 #include <linux/security.h>
74 #include <linux/kmod.h>
75 #include <linux/namei.h>
76 #include <linux/buffer_head.h>
77 #include <linux/capability.h>
78 #include <linux/quotaops.h>
79 #include <linux/writeback.h> /* for inode_lock, oddly enough.. */
81 #include <asm/uaccess.h>
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 * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
121 * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
122 * dqptr_sem. But filesystem has to count with the fact that functions such as
123 * dquot_alloc_space() acquire dqptr_sem and they usually have to be called
124 * from inside a transaction to keep filesystem consistency after a crash. Also
125 * filesystems usually want to do some IO on dquot from ->mark_dirty which is
126 * called with dqptr_sem held.
127 * i_mutex on quota files is special (it's below dqio_mutex)
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
|| (sb_dqopt(sb
)->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(&sb_dqopt(sb
)->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_nested(&sb_dqopt(sb
)->files
[cnt
]->i_mutex
,
663 truncate_inode_pages(&sb_dqopt(sb
)->files
[cnt
]->i_data
, 0);
664 mutex_unlock(&sb_dqopt(sb
)->files
[cnt
]->i_mutex
);
666 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
670 EXPORT_SYMBOL(dquot_quota_sync
);
672 /* Free unused dquots from cache */
673 static void prune_dqcache(int count
)
675 struct list_head
*head
;
678 head
= free_dquots
.prev
;
679 while (head
!= &free_dquots
&& count
) {
680 dquot
= list_entry(head
, struct dquot
, dq_free
);
681 remove_dquot_hash(dquot
);
682 remove_free_dquot(dquot
);
684 do_destroy_dquot(dquot
);
686 head
= free_dquots
.prev
;
691 * This is called from kswapd when we think we need some
694 static int shrink_dqcache_memory(struct shrinker
*shrink
, int nr
, gfp_t gfp_mask
)
697 spin_lock(&dq_list_lock
);
699 spin_unlock(&dq_list_lock
);
702 percpu_counter_read_positive(&dqstats
.counter
[DQST_FREE_DQUOTS
])
703 /100) * sysctl_vfs_cache_pressure
;
706 static struct shrinker dqcache_shrinker
= {
707 .shrink
= shrink_dqcache_memory
,
708 .seeks
= DEFAULT_SEEKS
,
712 * Put reference to dquot
713 * NOTE: If you change this function please check whether dqput_blocks() works right...
715 void dqput(struct dquot
*dquot
)
721 #ifdef CONFIG_QUOTA_DEBUG
722 if (!atomic_read(&dquot
->dq_count
)) {
723 quota_error(dquot
->dq_sb
, "trying to free free dquot of %s %d",
724 quotatypes
[dquot
->dq_type
], dquot
->dq_id
);
728 dqstats_inc(DQST_DROPS
);
730 spin_lock(&dq_list_lock
);
731 if (atomic_read(&dquot
->dq_count
) > 1) {
732 /* We have more than one user... nothing to do */
733 atomic_dec(&dquot
->dq_count
);
734 /* Releasing dquot during quotaoff phase? */
735 if (!sb_has_quota_active(dquot
->dq_sb
, dquot
->dq_type
) &&
736 atomic_read(&dquot
->dq_count
) == 1)
737 wake_up(&dquot
->dq_wait_unused
);
738 spin_unlock(&dq_list_lock
);
741 /* Need to release dquot? */
742 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && dquot_dirty(dquot
)) {
743 spin_unlock(&dq_list_lock
);
744 /* Commit dquot before releasing */
745 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
747 quota_error(dquot
->dq_sb
, "Can't write quota structure"
748 " (error %d). Quota may get out of sync!",
751 * We clear dirty bit anyway, so that we avoid
754 spin_lock(&dq_list_lock
);
755 clear_dquot_dirty(dquot
);
756 spin_unlock(&dq_list_lock
);
760 /* Clear flag in case dquot was inactive (something bad happened) */
761 clear_dquot_dirty(dquot
);
762 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
763 spin_unlock(&dq_list_lock
);
764 dquot
->dq_sb
->dq_op
->release_dquot(dquot
);
767 atomic_dec(&dquot
->dq_count
);
768 #ifdef CONFIG_QUOTA_DEBUG
770 BUG_ON(!list_empty(&dquot
->dq_free
));
772 put_dquot_last(dquot
);
773 spin_unlock(&dq_list_lock
);
775 EXPORT_SYMBOL(dqput
);
777 struct dquot
*dquot_alloc(struct super_block
*sb
, int type
)
779 return kmem_cache_zalloc(dquot_cachep
, GFP_NOFS
);
781 EXPORT_SYMBOL(dquot_alloc
);
783 static struct dquot
*get_empty_dquot(struct super_block
*sb
, int type
)
787 dquot
= sb
->dq_op
->alloc_dquot(sb
, type
);
791 mutex_init(&dquot
->dq_lock
);
792 INIT_LIST_HEAD(&dquot
->dq_free
);
793 INIT_LIST_HEAD(&dquot
->dq_inuse
);
794 INIT_HLIST_NODE(&dquot
->dq_hash
);
795 INIT_LIST_HEAD(&dquot
->dq_dirty
);
796 init_waitqueue_head(&dquot
->dq_wait_unused
);
798 dquot
->dq_type
= type
;
799 atomic_set(&dquot
->dq_count
, 1);
805 * Get reference to dquot
807 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
808 * destroying our dquot by:
809 * a) checking for quota flags under dq_list_lock and
810 * b) getting a reference to dquot before we release dq_list_lock
812 struct dquot
*dqget(struct super_block
*sb
, unsigned int id
, int type
)
814 unsigned int hashent
= hashfn(sb
, id
, type
);
815 struct dquot
*dquot
= NULL
, *empty
= NULL
;
817 if (!sb_has_quota_active(sb
, type
))
820 spin_lock(&dq_list_lock
);
821 spin_lock(&dq_state_lock
);
822 if (!sb_has_quota_active(sb
, type
)) {
823 spin_unlock(&dq_state_lock
);
824 spin_unlock(&dq_list_lock
);
827 spin_unlock(&dq_state_lock
);
829 dquot
= find_dquot(hashent
, sb
, id
, type
);
832 spin_unlock(&dq_list_lock
);
833 empty
= get_empty_dquot(sb
, type
);
835 schedule(); /* Try to wait for a moment... */
841 /* all dquots go on the inuse_list */
843 /* hash it first so it can be found */
844 insert_dquot_hash(dquot
);
845 spin_unlock(&dq_list_lock
);
846 dqstats_inc(DQST_LOOKUPS
);
848 if (!atomic_read(&dquot
->dq_count
))
849 remove_free_dquot(dquot
);
850 atomic_inc(&dquot
->dq_count
);
851 spin_unlock(&dq_list_lock
);
852 dqstats_inc(DQST_CACHE_HITS
);
853 dqstats_inc(DQST_LOOKUPS
);
855 /* Wait for dq_lock - after this we know that either dquot_release() is
856 * already finished or it will be canceled due to dq_count > 1 test */
857 wait_on_dquot(dquot
);
858 /* Read the dquot / allocate space in quota file */
859 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) &&
860 sb
->dq_op
->acquire_dquot(dquot
) < 0) {
865 #ifdef CONFIG_QUOTA_DEBUG
866 BUG_ON(!dquot
->dq_sb
); /* Has somebody invalidated entry under us? */
870 do_destroy_dquot(empty
);
874 EXPORT_SYMBOL(dqget
);
876 static int dqinit_needed(struct inode
*inode
, int type
)
880 if (IS_NOQUOTA(inode
))
883 return !inode
->i_dquot
[type
];
884 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
885 if (!inode
->i_dquot
[cnt
])
890 /* This routine is guarded by dqonoff_mutex mutex */
891 static void add_dquot_ref(struct super_block
*sb
, int type
)
893 struct inode
*inode
, *old_inode
= NULL
;
894 #ifdef CONFIG_QUOTA_DEBUG
898 spin_lock(&inode_lock
);
899 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
900 if (inode
->i_state
& (I_FREEING
|I_WILL_FREE
|I_NEW
))
902 #ifdef CONFIG_QUOTA_DEBUG
903 if (unlikely(inode_get_rsv_space(inode
) > 0))
906 if (!atomic_read(&inode
->i_writecount
))
908 if (!dqinit_needed(inode
, type
))
912 spin_unlock(&inode_lock
);
915 __dquot_initialize(inode
, type
);
916 /* We hold a reference to 'inode' so it couldn't have been
917 * removed from s_inodes list while we dropped the inode_lock.
918 * We cannot iput the inode now as we can be holding the last
919 * reference and we cannot iput it under inode_lock. So we
920 * keep the reference and iput it later. */
922 spin_lock(&inode_lock
);
924 spin_unlock(&inode_lock
);
927 #ifdef CONFIG_QUOTA_DEBUG
929 quota_error(sb
, "Writes happened before quota was turned on "
930 "thus quota information is probably inconsistent. "
931 "Please run quotacheck(8)");
937 * Return 0 if dqput() won't block.
938 * (note that 1 doesn't necessarily mean blocking)
940 static inline int dqput_blocks(struct dquot
*dquot
)
942 if (atomic_read(&dquot
->dq_count
) <= 1)
948 * Remove references to dquots from inode and add dquot to list for freeing
949 * if we have the last referece to dquot
950 * We can't race with anybody because we hold dqptr_sem for writing...
952 static int remove_inode_dquot_ref(struct inode
*inode
, int type
,
953 struct list_head
*tofree_head
)
955 struct dquot
*dquot
= inode
->i_dquot
[type
];
957 inode
->i_dquot
[type
] = NULL
;
959 if (dqput_blocks(dquot
)) {
960 #ifdef CONFIG_QUOTA_DEBUG
961 if (atomic_read(&dquot
->dq_count
) != 1)
962 quota_error(inode
->i_sb
, "Adding dquot with "
963 "dq_count %d to dispose list",
964 atomic_read(&dquot
->dq_count
));
966 spin_lock(&dq_list_lock
);
967 /* As dquot must have currently users it can't be on
968 * the free list... */
969 list_add(&dquot
->dq_free
, tofree_head
);
970 spin_unlock(&dq_list_lock
);
974 dqput(dquot
); /* We have guaranteed we won't block */
980 * Free list of dquots
981 * Dquots are removed from inodes and no new references can be got so we are
982 * the only ones holding reference
984 static void put_dquot_list(struct list_head
*tofree_head
)
986 struct list_head
*act_head
;
989 act_head
= tofree_head
->next
;
990 while (act_head
!= tofree_head
) {
991 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
992 act_head
= act_head
->next
;
993 /* Remove dquot from the list so we won't have problems... */
994 list_del_init(&dquot
->dq_free
);
999 static void remove_dquot_ref(struct super_block
*sb
, int type
,
1000 struct list_head
*tofree_head
)
1002 struct inode
*inode
;
1005 spin_lock(&inode_lock
);
1006 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
1008 * We have to scan also I_NEW inodes because they can already
1009 * have quota pointer initialized. Luckily, we need to touch
1010 * only quota pointers and these have separate locking
1013 if (!IS_NOQUOTA(inode
)) {
1014 if (unlikely(inode_get_rsv_space(inode
) > 0))
1016 remove_inode_dquot_ref(inode
, type
, tofree_head
);
1019 spin_unlock(&inode_lock
);
1020 #ifdef CONFIG_QUOTA_DEBUG
1022 printk(KERN_WARNING
"VFS (%s): Writes happened after quota"
1023 " was disabled thus quota information is probably "
1024 "inconsistent. Please run quotacheck(8).\n", sb
->s_id
);
1029 /* Gather all references from inodes and drop them */
1030 static void drop_dquot_ref(struct super_block
*sb
, int type
)
1032 LIST_HEAD(tofree_head
);
1035 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1036 remove_dquot_ref(sb
, type
, &tofree_head
);
1037 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1038 put_dquot_list(&tofree_head
);
1042 static inline void dquot_incr_inodes(struct dquot
*dquot
, qsize_t number
)
1044 dquot
->dq_dqb
.dqb_curinodes
+= number
;
1047 static inline void dquot_incr_space(struct dquot
*dquot
, qsize_t number
)
1049 dquot
->dq_dqb
.dqb_curspace
+= number
;
1052 static inline void dquot_resv_space(struct dquot
*dquot
, qsize_t number
)
1054 dquot
->dq_dqb
.dqb_rsvspace
+= number
;
1058 * Claim reserved quota space
1060 static void dquot_claim_reserved_space(struct dquot
*dquot
, qsize_t number
)
1062 if (dquot
->dq_dqb
.dqb_rsvspace
< number
) {
1064 number
= dquot
->dq_dqb
.dqb_rsvspace
;
1066 dquot
->dq_dqb
.dqb_curspace
+= number
;
1067 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1071 void dquot_free_reserved_space(struct dquot
*dquot
, qsize_t number
)
1073 if (dquot
->dq_dqb
.dqb_rsvspace
>= number
)
1074 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1077 dquot
->dq_dqb
.dqb_rsvspace
= 0;
1081 static void dquot_decr_inodes(struct dquot
*dquot
, qsize_t number
)
1083 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1084 dquot
->dq_dqb
.dqb_curinodes
>= number
)
1085 dquot
->dq_dqb
.dqb_curinodes
-= number
;
1087 dquot
->dq_dqb
.dqb_curinodes
= 0;
1088 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1089 dquot
->dq_dqb
.dqb_itime
= (time_t) 0;
1090 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
1093 static void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
1095 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1096 dquot
->dq_dqb
.dqb_curspace
>= number
)
1097 dquot
->dq_dqb
.dqb_curspace
-= number
;
1099 dquot
->dq_dqb
.dqb_curspace
= 0;
1100 if (dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1101 dquot
->dq_dqb
.dqb_btime
= (time_t) 0;
1102 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1105 static int warning_issued(struct dquot
*dquot
, const int warntype
)
1107 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
1108 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
1109 ((warntype
== QUOTA_NL_IHARDWARN
||
1110 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
1114 return test_and_set_bit(flag
, &dquot
->dq_flags
);
1117 #ifdef CONFIG_PRINT_QUOTA_WARNING
1118 static int flag_print_warnings
= 1;
1120 static int need_print_warning(struct dquot
*dquot
)
1122 if (!flag_print_warnings
)
1125 switch (dquot
->dq_type
) {
1127 return current_fsuid() == dquot
->dq_id
;
1129 return in_group_p(dquot
->dq_id
);
1134 /* Print warning to user which exceeded quota */
1135 static void print_warning(struct dquot
*dquot
, const int warntype
)
1138 struct tty_struct
*tty
;
1140 if (warntype
== QUOTA_NL_IHARDBELOW
||
1141 warntype
== QUOTA_NL_ISOFTBELOW
||
1142 warntype
== QUOTA_NL_BHARDBELOW
||
1143 warntype
== QUOTA_NL_BSOFTBELOW
|| !need_print_warning(dquot
))
1146 tty
= get_current_tty();
1149 tty_write_message(tty
, dquot
->dq_sb
->s_id
);
1150 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
1151 tty_write_message(tty
, ": warning, ");
1153 tty_write_message(tty
, ": write failed, ");
1154 tty_write_message(tty
, quotatypes
[dquot
->dq_type
]);
1156 case QUOTA_NL_IHARDWARN
:
1157 msg
= " file limit reached.\r\n";
1159 case QUOTA_NL_ISOFTLONGWARN
:
1160 msg
= " file quota exceeded too long.\r\n";
1162 case QUOTA_NL_ISOFTWARN
:
1163 msg
= " file quota exceeded.\r\n";
1165 case QUOTA_NL_BHARDWARN
:
1166 msg
= " block limit reached.\r\n";
1168 case QUOTA_NL_BSOFTLONGWARN
:
1169 msg
= " block quota exceeded too long.\r\n";
1171 case QUOTA_NL_BSOFTWARN
:
1172 msg
= " block quota exceeded.\r\n";
1175 tty_write_message(tty
, msg
);
1181 * Write warnings to the console and send warning messages over netlink.
1183 * Note that this function can sleep.
1185 static void flush_warnings(struct dquot
*const *dquots
, char *warntype
)
1190 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1192 if (dq
&& warntype
[i
] != QUOTA_NL_NOWARN
&&
1193 !warning_issued(dq
, warntype
[i
])) {
1194 #ifdef CONFIG_PRINT_QUOTA_WARNING
1195 print_warning(dq
, warntype
[i
]);
1197 quota_send_warning(dq
->dq_type
, dq
->dq_id
,
1198 dq
->dq_sb
->s_dev
, warntype
[i
]);
1203 static int ignore_hardlimit(struct dquot
*dquot
)
1205 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
1207 return capable(CAP_SYS_RESOURCE
) &&
1208 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
||
1209 !(info
->dqi_flags
& V1_DQF_RSQUASH
));
1212 /* needs dq_data_lock */
1213 static int check_idq(struct dquot
*dquot
, qsize_t inodes
, char *warntype
)
1215 qsize_t newinodes
= dquot
->dq_dqb
.dqb_curinodes
+ inodes
;
1217 *warntype
= QUOTA_NL_NOWARN
;
1218 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
) ||
1219 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1222 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1223 newinodes
> dquot
->dq_dqb
.dqb_ihardlimit
&&
1224 !ignore_hardlimit(dquot
)) {
1225 *warntype
= QUOTA_NL_IHARDWARN
;
1229 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1230 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1231 dquot
->dq_dqb
.dqb_itime
&&
1232 get_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1233 !ignore_hardlimit(dquot
)) {
1234 *warntype
= QUOTA_NL_ISOFTLONGWARN
;
1238 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1239 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1240 dquot
->dq_dqb
.dqb_itime
== 0) {
1241 *warntype
= QUOTA_NL_ISOFTWARN
;
1242 dquot
->dq_dqb
.dqb_itime
= get_seconds() +
1243 sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_igrace
;
1249 /* needs dq_data_lock */
1250 static int check_bdq(struct dquot
*dquot
, qsize_t space
, int prealloc
, char *warntype
)
1253 struct super_block
*sb
= dquot
->dq_sb
;
1255 *warntype
= QUOTA_NL_NOWARN
;
1256 if (!sb_has_quota_limits_enabled(sb
, dquot
->dq_type
) ||
1257 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1260 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
1263 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1264 tspace
> dquot
->dq_dqb
.dqb_bhardlimit
&&
1265 !ignore_hardlimit(dquot
)) {
1267 *warntype
= QUOTA_NL_BHARDWARN
;
1271 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1272 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1273 dquot
->dq_dqb
.dqb_btime
&&
1274 get_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1275 !ignore_hardlimit(dquot
)) {
1277 *warntype
= QUOTA_NL_BSOFTLONGWARN
;
1281 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1282 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1283 dquot
->dq_dqb
.dqb_btime
== 0) {
1285 *warntype
= QUOTA_NL_BSOFTWARN
;
1286 dquot
->dq_dqb
.dqb_btime
= get_seconds() +
1287 sb_dqopt(sb
)->info
[dquot
->dq_type
].dqi_bgrace
;
1291 * We don't allow preallocation to exceed softlimit so exceeding will
1300 static int info_idq_free(struct dquot
*dquot
, qsize_t inodes
)
1304 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1305 dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
||
1306 !sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
))
1307 return QUOTA_NL_NOWARN
;
1309 newinodes
= dquot
->dq_dqb
.dqb_curinodes
- inodes
;
1310 if (newinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1311 return QUOTA_NL_ISOFTBELOW
;
1312 if (dquot
->dq_dqb
.dqb_curinodes
>= dquot
->dq_dqb
.dqb_ihardlimit
&&
1313 newinodes
< dquot
->dq_dqb
.dqb_ihardlimit
)
1314 return QUOTA_NL_IHARDBELOW
;
1315 return QUOTA_NL_NOWARN
;
1318 static int info_bdq_free(struct dquot
*dquot
, qsize_t space
)
1320 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1321 dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1322 return QUOTA_NL_NOWARN
;
1324 if (dquot
->dq_dqb
.dqb_curspace
- space
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1325 return QUOTA_NL_BSOFTBELOW
;
1326 if (dquot
->dq_dqb
.dqb_curspace
>= dquot
->dq_dqb
.dqb_bhardlimit
&&
1327 dquot
->dq_dqb
.dqb_curspace
- space
< dquot
->dq_dqb
.dqb_bhardlimit
)
1328 return QUOTA_NL_BHARDBELOW
;
1329 return QUOTA_NL_NOWARN
;
1332 static int dquot_active(const struct inode
*inode
)
1334 struct super_block
*sb
= inode
->i_sb
;
1336 if (IS_NOQUOTA(inode
))
1338 return sb_any_quota_loaded(sb
) & ~sb_any_quota_suspended(sb
);
1342 * Initialize quota pointers in inode
1344 * We do things in a bit complicated way but by that we avoid calling
1345 * dqget() and thus filesystem callbacks under dqptr_sem.
1347 * It is better to call this function outside of any transaction as it
1348 * might need a lot of space in journal for dquot structure allocation.
1350 static void __dquot_initialize(struct inode
*inode
, int type
)
1352 unsigned int id
= 0;
1354 struct dquot
*got
[MAXQUOTAS
];
1355 struct super_block
*sb
= inode
->i_sb
;
1358 /* First test before acquiring mutex - solves deadlocks when we
1359 * re-enter the quota code and are already holding the mutex */
1360 if (!dquot_active(inode
))
1363 /* First get references to structures we might need. */
1364 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1366 if (type
!= -1 && cnt
!= type
)
1376 got
[cnt
] = dqget(sb
, id
, cnt
);
1379 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1380 if (IS_NOQUOTA(inode
))
1382 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1383 if (type
!= -1 && cnt
!= type
)
1385 /* Avoid races with quotaoff() */
1386 if (!sb_has_quota_active(sb
, cnt
))
1388 /* We could race with quotaon or dqget() could have failed */
1391 if (!inode
->i_dquot
[cnt
]) {
1392 inode
->i_dquot
[cnt
] = got
[cnt
];
1395 * Make quota reservation system happy if someone
1396 * did a write before quota was turned on
1398 rsv
= inode_get_rsv_space(inode
);
1400 dquot_resv_space(inode
->i_dquot
[cnt
], rsv
);
1404 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1405 /* Drop unused references */
1409 void dquot_initialize(struct inode
*inode
)
1411 __dquot_initialize(inode
, -1);
1413 EXPORT_SYMBOL(dquot_initialize
);
1416 * Release all quotas referenced by inode
1418 static void __dquot_drop(struct inode
*inode
)
1421 struct dquot
*put
[MAXQUOTAS
];
1423 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1424 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1425 put
[cnt
] = inode
->i_dquot
[cnt
];
1426 inode
->i_dquot
[cnt
] = NULL
;
1428 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1432 void dquot_drop(struct inode
*inode
)
1436 if (IS_NOQUOTA(inode
))
1440 * Test before calling to rule out calls from proc and such
1441 * where we are not allowed to block. Note that this is
1442 * actually reliable test even without the lock - the caller
1443 * must assure that nobody can come after the DQUOT_DROP and
1444 * add quota pointers back anyway.
1446 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1447 if (inode
->i_dquot
[cnt
])
1451 if (cnt
< MAXQUOTAS
)
1452 __dquot_drop(inode
);
1454 EXPORT_SYMBOL(dquot_drop
);
1457 * inode_reserved_space is managed internally by quota, and protected by
1458 * i_lock similar to i_blocks+i_bytes.
1460 static qsize_t
*inode_reserved_space(struct inode
* inode
)
1462 /* Filesystem must explicitly define it's own method in order to use
1463 * quota reservation interface */
1464 BUG_ON(!inode
->i_sb
->dq_op
->get_reserved_space
);
1465 return inode
->i_sb
->dq_op
->get_reserved_space(inode
);
1468 void inode_add_rsv_space(struct inode
*inode
, qsize_t number
)
1470 spin_lock(&inode
->i_lock
);
1471 *inode_reserved_space(inode
) += number
;
1472 spin_unlock(&inode
->i_lock
);
1474 EXPORT_SYMBOL(inode_add_rsv_space
);
1476 void inode_claim_rsv_space(struct inode
*inode
, qsize_t number
)
1478 spin_lock(&inode
->i_lock
);
1479 *inode_reserved_space(inode
) -= number
;
1480 __inode_add_bytes(inode
, number
);
1481 spin_unlock(&inode
->i_lock
);
1483 EXPORT_SYMBOL(inode_claim_rsv_space
);
1485 void inode_sub_rsv_space(struct inode
*inode
, qsize_t number
)
1487 spin_lock(&inode
->i_lock
);
1488 *inode_reserved_space(inode
) -= number
;
1489 spin_unlock(&inode
->i_lock
);
1491 EXPORT_SYMBOL(inode_sub_rsv_space
);
1493 static qsize_t
inode_get_rsv_space(struct inode
*inode
)
1497 if (!inode
->i_sb
->dq_op
->get_reserved_space
)
1499 spin_lock(&inode
->i_lock
);
1500 ret
= *inode_reserved_space(inode
);
1501 spin_unlock(&inode
->i_lock
);
1505 static void inode_incr_space(struct inode
*inode
, qsize_t number
,
1509 inode_add_rsv_space(inode
, number
);
1511 inode_add_bytes(inode
, number
);
1514 static void inode_decr_space(struct inode
*inode
, qsize_t number
, int reserve
)
1517 inode_sub_rsv_space(inode
, number
);
1519 inode_sub_bytes(inode
, number
);
1523 * This functions updates i_blocks+i_bytes fields and quota information
1524 * (together with appropriate checks).
1526 * NOTE: We absolutely rely on the fact that caller dirties the inode
1527 * (usually helpers in quotaops.h care about this) and holds a handle for
1528 * the current transaction so that dquot write and inode write go into the
1533 * This operation can block, but only after everything is updated
1535 int __dquot_alloc_space(struct inode
*inode
, qsize_t number
, int flags
)
1538 char warntype
[MAXQUOTAS
];
1539 int warn
= flags
& DQUOT_SPACE_WARN
;
1540 int reserve
= flags
& DQUOT_SPACE_RESERVE
;
1541 int nofail
= flags
& DQUOT_SPACE_NOFAIL
;
1544 * First test before acquiring mutex - solves deadlocks when we
1545 * re-enter the quota code and are already holding the mutex
1547 if (!dquot_active(inode
)) {
1548 inode_incr_space(inode
, number
, reserve
);
1552 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1553 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1554 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1556 spin_lock(&dq_data_lock
);
1557 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1558 if (!inode
->i_dquot
[cnt
])
1560 ret
= check_bdq(inode
->i_dquot
[cnt
], number
, !warn
,
1562 if (ret
&& !nofail
) {
1563 spin_unlock(&dq_data_lock
);
1564 goto out_flush_warn
;
1567 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1568 if (!inode
->i_dquot
[cnt
])
1571 dquot_resv_space(inode
->i_dquot
[cnt
], number
);
1573 dquot_incr_space(inode
->i_dquot
[cnt
], number
);
1575 inode_incr_space(inode
, number
, reserve
);
1576 spin_unlock(&dq_data_lock
);
1579 goto out_flush_warn
;
1580 mark_all_dquot_dirty(inode
->i_dquot
);
1582 flush_warnings(inode
->i_dquot
, warntype
);
1583 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1587 EXPORT_SYMBOL(__dquot_alloc_space
);
1590 * This operation can block, but only after everything is updated
1592 int dquot_alloc_inode(const struct inode
*inode
)
1595 char warntype
[MAXQUOTAS
];
1597 /* First test before acquiring mutex - solves deadlocks when we
1598 * re-enter the quota code and are already holding the mutex */
1599 if (!dquot_active(inode
))
1601 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1602 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1603 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1604 spin_lock(&dq_data_lock
);
1605 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1606 if (!inode
->i_dquot
[cnt
])
1608 ret
= check_idq(inode
->i_dquot
[cnt
], 1, warntype
+ cnt
);
1613 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1614 if (!inode
->i_dquot
[cnt
])
1616 dquot_incr_inodes(inode
->i_dquot
[cnt
], 1);
1620 spin_unlock(&dq_data_lock
);
1622 mark_all_dquot_dirty(inode
->i_dquot
);
1623 flush_warnings(inode
->i_dquot
, warntype
);
1624 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1627 EXPORT_SYMBOL(dquot_alloc_inode
);
1630 * Convert in-memory reserved quotas to real consumed quotas
1632 int dquot_claim_space_nodirty(struct inode
*inode
, qsize_t number
)
1636 if (!dquot_active(inode
)) {
1637 inode_claim_rsv_space(inode
, number
);
1641 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1642 spin_lock(&dq_data_lock
);
1643 /* Claim reserved quotas to allocated quotas */
1644 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1645 if (inode
->i_dquot
[cnt
])
1646 dquot_claim_reserved_space(inode
->i_dquot
[cnt
],
1649 /* Update inode bytes */
1650 inode_claim_rsv_space(inode
, number
);
1651 spin_unlock(&dq_data_lock
);
1652 mark_all_dquot_dirty(inode
->i_dquot
);
1653 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1656 EXPORT_SYMBOL(dquot_claim_space_nodirty
);
1659 * This operation can block, but only after everything is updated
1661 void __dquot_free_space(struct inode
*inode
, qsize_t number
, int flags
)
1664 char warntype
[MAXQUOTAS
];
1665 int reserve
= flags
& DQUOT_SPACE_RESERVE
;
1667 /* First test before acquiring mutex - solves deadlocks when we
1668 * re-enter the quota code and are already holding the mutex */
1669 if (!dquot_active(inode
)) {
1670 inode_decr_space(inode
, number
, reserve
);
1674 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1675 spin_lock(&dq_data_lock
);
1676 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1677 if (!inode
->i_dquot
[cnt
])
1679 warntype
[cnt
] = info_bdq_free(inode
->i_dquot
[cnt
], number
);
1681 dquot_free_reserved_space(inode
->i_dquot
[cnt
], number
);
1683 dquot_decr_space(inode
->i_dquot
[cnt
], number
);
1685 inode_decr_space(inode
, number
, reserve
);
1686 spin_unlock(&dq_data_lock
);
1690 mark_all_dquot_dirty(inode
->i_dquot
);
1692 flush_warnings(inode
->i_dquot
, warntype
);
1693 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1695 EXPORT_SYMBOL(__dquot_free_space
);
1698 * This operation can block, but only after everything is updated
1700 void dquot_free_inode(const struct inode
*inode
)
1703 char warntype
[MAXQUOTAS
];
1705 /* First test before acquiring mutex - solves deadlocks when we
1706 * re-enter the quota code and are already holding the mutex */
1707 if (!dquot_active(inode
))
1710 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1711 spin_lock(&dq_data_lock
);
1712 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1713 if (!inode
->i_dquot
[cnt
])
1715 warntype
[cnt
] = info_idq_free(inode
->i_dquot
[cnt
], 1);
1716 dquot_decr_inodes(inode
->i_dquot
[cnt
], 1);
1718 spin_unlock(&dq_data_lock
);
1719 mark_all_dquot_dirty(inode
->i_dquot
);
1720 flush_warnings(inode
->i_dquot
, warntype
);
1721 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1723 EXPORT_SYMBOL(dquot_free_inode
);
1726 * Transfer the number of inode and blocks from one diskquota to an other.
1727 * On success, dquot references in transfer_to are consumed and references
1728 * to original dquots that need to be released are placed there. On failure,
1729 * references are kept untouched.
1731 * This operation can block, but only after everything is updated
1732 * A transaction must be started when entering this function.
1735 int __dquot_transfer(struct inode
*inode
, struct dquot
**transfer_to
)
1737 qsize_t space
, cur_space
;
1738 qsize_t rsv_space
= 0;
1739 struct dquot
*transfer_from
[MAXQUOTAS
] = {};
1741 char is_valid
[MAXQUOTAS
] = {};
1742 char warntype_to
[MAXQUOTAS
];
1743 char warntype_from_inodes
[MAXQUOTAS
], warntype_from_space
[MAXQUOTAS
];
1745 /* First test before acquiring mutex - solves deadlocks when we
1746 * re-enter the quota code and are already holding the mutex */
1747 if (IS_NOQUOTA(inode
))
1749 /* Initialize the arrays */
1750 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1751 warntype_to
[cnt
] = QUOTA_NL_NOWARN
;
1752 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1753 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1754 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1757 spin_lock(&dq_data_lock
);
1758 cur_space
= inode_get_bytes(inode
);
1759 rsv_space
= inode_get_rsv_space(inode
);
1760 space
= cur_space
+ rsv_space
;
1761 /* Build the transfer_from list and check the limits */
1762 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1764 * Skip changes for same uid or gid or for turned off quota-type.
1766 if (!transfer_to
[cnt
])
1768 /* Avoid races with quotaoff() */
1769 if (!sb_has_quota_active(inode
->i_sb
, cnt
))
1772 transfer_from
[cnt
] = inode
->i_dquot
[cnt
];
1773 ret
= check_idq(transfer_to
[cnt
], 1, warntype_to
+ cnt
);
1776 ret
= check_bdq(transfer_to
[cnt
], space
, 0, warntype_to
+ cnt
);
1782 * Finally perform the needed transfer from transfer_from to transfer_to
1784 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1787 /* Due to IO error we might not have transfer_from[] structure */
1788 if (transfer_from
[cnt
]) {
1789 warntype_from_inodes
[cnt
] =
1790 info_idq_free(transfer_from
[cnt
], 1);
1791 warntype_from_space
[cnt
] =
1792 info_bdq_free(transfer_from
[cnt
], space
);
1793 dquot_decr_inodes(transfer_from
[cnt
], 1);
1794 dquot_decr_space(transfer_from
[cnt
], cur_space
);
1795 dquot_free_reserved_space(transfer_from
[cnt
],
1799 dquot_incr_inodes(transfer_to
[cnt
], 1);
1800 dquot_incr_space(transfer_to
[cnt
], cur_space
);
1801 dquot_resv_space(transfer_to
[cnt
], rsv_space
);
1803 inode
->i_dquot
[cnt
] = transfer_to
[cnt
];
1805 spin_unlock(&dq_data_lock
);
1806 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1808 mark_all_dquot_dirty(transfer_from
);
1809 mark_all_dquot_dirty(transfer_to
);
1810 flush_warnings(transfer_to
, warntype_to
);
1811 flush_warnings(transfer_from
, warntype_from_inodes
);
1812 flush_warnings(transfer_from
, warntype_from_space
);
1813 /* Pass back references to put */
1814 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1816 transfer_to
[cnt
] = transfer_from
[cnt
];
1819 spin_unlock(&dq_data_lock
);
1820 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1821 flush_warnings(transfer_to
, warntype_to
);
1824 EXPORT_SYMBOL(__dquot_transfer
);
1826 /* Wrapper for transferring ownership of an inode for uid/gid only
1827 * Called from FSXXX_setattr()
1829 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
1831 struct dquot
*transfer_to
[MAXQUOTAS
] = {};
1832 struct super_block
*sb
= inode
->i_sb
;
1835 if (!dquot_active(inode
))
1838 if (iattr
->ia_valid
& ATTR_UID
&& iattr
->ia_uid
!= inode
->i_uid
)
1839 transfer_to
[USRQUOTA
] = dqget(sb
, iattr
->ia_uid
, USRQUOTA
);
1840 if (iattr
->ia_valid
& ATTR_GID
&& iattr
->ia_gid
!= inode
->i_gid
)
1841 transfer_to
[GRPQUOTA
] = dqget(sb
, iattr
->ia_gid
, GRPQUOTA
);
1843 ret
= __dquot_transfer(inode
, transfer_to
);
1844 dqput_all(transfer_to
);
1847 EXPORT_SYMBOL(dquot_transfer
);
1850 * Write info of quota file to disk
1852 int dquot_commit_info(struct super_block
*sb
, int type
)
1855 struct quota_info
*dqopt
= sb_dqopt(sb
);
1857 mutex_lock(&dqopt
->dqio_mutex
);
1858 ret
= dqopt
->ops
[type
]->write_file_info(sb
, type
);
1859 mutex_unlock(&dqopt
->dqio_mutex
);
1862 EXPORT_SYMBOL(dquot_commit_info
);
1865 * Definitions of diskquota operations.
1867 const struct dquot_operations dquot_operations
= {
1868 .write_dquot
= dquot_commit
,
1869 .acquire_dquot
= dquot_acquire
,
1870 .release_dquot
= dquot_release
,
1871 .mark_dirty
= dquot_mark_dquot_dirty
,
1872 .write_info
= dquot_commit_info
,
1873 .alloc_dquot
= dquot_alloc
,
1874 .destroy_dquot
= dquot_destroy
,
1876 EXPORT_SYMBOL(dquot_operations
);
1879 * Generic helper for ->open on filesystems supporting disk quotas.
1881 int dquot_file_open(struct inode
*inode
, struct file
*file
)
1885 error
= generic_file_open(inode
, file
);
1886 if (!error
&& (file
->f_mode
& FMODE_WRITE
))
1887 dquot_initialize(inode
);
1890 EXPORT_SYMBOL(dquot_file_open
);
1893 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1895 int dquot_disable(struct super_block
*sb
, int type
, unsigned int flags
)
1898 struct quota_info
*dqopt
= sb_dqopt(sb
);
1899 struct inode
*toputinode
[MAXQUOTAS
];
1901 /* Cannot turn off usage accounting without turning off limits, or
1902 * suspend quotas and simultaneously turn quotas off. */
1903 if ((flags
& DQUOT_USAGE_ENABLED
&& !(flags
& DQUOT_LIMITS_ENABLED
))
1904 || (flags
& DQUOT_SUSPENDED
&& flags
& (DQUOT_LIMITS_ENABLED
|
1905 DQUOT_USAGE_ENABLED
)))
1908 /* We need to serialize quota_off() for device */
1909 mutex_lock(&dqopt
->dqonoff_mutex
);
1912 * Skip everything if there's nothing to do. We have to do this because
1913 * sometimes we are called when fill_super() failed and calling
1914 * sync_fs() in such cases does no good.
1916 if (!sb_any_quota_loaded(sb
)) {
1917 mutex_unlock(&dqopt
->dqonoff_mutex
);
1920 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1921 toputinode
[cnt
] = NULL
;
1922 if (type
!= -1 && cnt
!= type
)
1924 if (!sb_has_quota_loaded(sb
, cnt
))
1927 if (flags
& DQUOT_SUSPENDED
) {
1928 spin_lock(&dq_state_lock
);
1930 dquot_state_flag(DQUOT_SUSPENDED
, cnt
);
1931 spin_unlock(&dq_state_lock
);
1933 spin_lock(&dq_state_lock
);
1934 dqopt
->flags
&= ~dquot_state_flag(flags
, cnt
);
1935 /* Turning off suspended quotas? */
1936 if (!sb_has_quota_loaded(sb
, cnt
) &&
1937 sb_has_quota_suspended(sb
, cnt
)) {
1938 dqopt
->flags
&= ~dquot_state_flag(
1939 DQUOT_SUSPENDED
, cnt
);
1940 spin_unlock(&dq_state_lock
);
1941 iput(dqopt
->files
[cnt
]);
1942 dqopt
->files
[cnt
] = NULL
;
1945 spin_unlock(&dq_state_lock
);
1948 /* We still have to keep quota loaded? */
1949 if (sb_has_quota_loaded(sb
, cnt
) && !(flags
& DQUOT_SUSPENDED
))
1952 /* Note: these are blocking operations */
1953 drop_dquot_ref(sb
, cnt
);
1954 invalidate_dquots(sb
, cnt
);
1956 * Now all dquots should be invalidated, all writes done so we
1957 * should be only users of the info. No locks needed.
1959 if (info_dirty(&dqopt
->info
[cnt
]))
1960 sb
->dq_op
->write_info(sb
, cnt
);
1961 if (dqopt
->ops
[cnt
]->free_file_info
)
1962 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
1963 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
1965 toputinode
[cnt
] = dqopt
->files
[cnt
];
1966 if (!sb_has_quota_loaded(sb
, cnt
))
1967 dqopt
->files
[cnt
] = NULL
;
1968 dqopt
->info
[cnt
].dqi_flags
= 0;
1969 dqopt
->info
[cnt
].dqi_igrace
= 0;
1970 dqopt
->info
[cnt
].dqi_bgrace
= 0;
1971 dqopt
->ops
[cnt
] = NULL
;
1973 mutex_unlock(&dqopt
->dqonoff_mutex
);
1975 /* Skip syncing and setting flags if quota files are hidden */
1976 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
1979 /* Sync the superblock so that buffers with quota data are written to
1980 * disk (and so userspace sees correct data afterwards). */
1981 if (sb
->s_op
->sync_fs
)
1982 sb
->s_op
->sync_fs(sb
, 1);
1983 sync_blockdev(sb
->s_bdev
);
1984 /* Now the quota files are just ordinary files and we can set the
1985 * inode flags back. Moreover we discard the pagecache so that
1986 * userspace sees the writes we did bypassing the pagecache. We
1987 * must also discard the blockdev buffers so that we see the
1988 * changes done by userspace on the next quotaon() */
1989 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1990 if (toputinode
[cnt
]) {
1991 mutex_lock(&dqopt
->dqonoff_mutex
);
1992 /* If quota was reenabled in the meantime, we have
1994 if (!sb_has_quota_loaded(sb
, cnt
)) {
1995 mutex_lock_nested(&toputinode
[cnt
]->i_mutex
,
1997 toputinode
[cnt
]->i_flags
&= ~(S_IMMUTABLE
|
1998 S_NOATIME
| S_NOQUOTA
);
1999 truncate_inode_pages(&toputinode
[cnt
]->i_data
,
2001 mutex_unlock(&toputinode
[cnt
]->i_mutex
);
2002 mark_inode_dirty_sync(toputinode
[cnt
]);
2004 mutex_unlock(&dqopt
->dqonoff_mutex
);
2007 invalidate_bdev(sb
->s_bdev
);
2009 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2010 if (toputinode
[cnt
]) {
2011 /* On remount RO, we keep the inode pointer so that we
2012 * can reenable quota on the subsequent remount RW. We
2013 * have to check 'flags' variable and not use sb_has_
2014 * function because another quotaon / quotaoff could
2015 * change global state before we got here. We refuse
2016 * to suspend quotas when there is pending delete on
2017 * the quota file... */
2018 if (!(flags
& DQUOT_SUSPENDED
))
2019 iput(toputinode
[cnt
]);
2020 else if (!toputinode
[cnt
]->i_nlink
)
2025 EXPORT_SYMBOL(dquot_disable
);
2027 int dquot_quota_off(struct super_block
*sb
, int type
)
2029 return dquot_disable(sb
, type
,
2030 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2032 EXPORT_SYMBOL(dquot_quota_off
);
2035 * Turn quotas on on a device
2039 * Helper function to turn quotas on when we already have the inode of
2040 * quota file and no quota information is loaded.
2042 static int vfs_load_quota_inode(struct inode
*inode
, int type
, int format_id
,
2045 struct quota_format_type
*fmt
= find_quota_format(format_id
);
2046 struct super_block
*sb
= inode
->i_sb
;
2047 struct quota_info
*dqopt
= sb_dqopt(sb
);
2053 if (!S_ISREG(inode
->i_mode
)) {
2057 if (IS_RDONLY(inode
)) {
2061 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
) {
2065 /* Usage always has to be set... */
2066 if (!(flags
& DQUOT_USAGE_ENABLED
)) {
2071 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2072 /* As we bypass the pagecache we must now flush all the
2073 * dirty data and invalidate caches so that kernel sees
2074 * changes from userspace. It is not enough to just flush
2075 * the quota file since if blocksize < pagesize, invalidation
2076 * of the cache could fail because of other unrelated dirty
2078 sync_filesystem(sb
);
2079 invalidate_bdev(sb
->s_bdev
);
2081 mutex_lock(&dqopt
->dqonoff_mutex
);
2082 if (sb_has_quota_loaded(sb
, type
)) {
2087 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2088 /* We don't want quota and atime on quota files (deadlocks
2089 * possible) Also nobody should write to the file - we use
2090 * special IO operations which ignore the immutable bit. */
2091 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
2092 oldflags
= inode
->i_flags
& (S_NOATIME
| S_IMMUTABLE
|
2094 inode
->i_flags
|= S_NOQUOTA
| S_NOATIME
| S_IMMUTABLE
;
2095 mutex_unlock(&inode
->i_mutex
);
2097 * When S_NOQUOTA is set, remove dquot references as no more
2098 * references can be added
2100 __dquot_drop(inode
);
2104 dqopt
->files
[type
] = igrab(inode
);
2105 if (!dqopt
->files
[type
])
2108 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
2111 dqopt
->ops
[type
] = fmt
->qf_ops
;
2112 dqopt
->info
[type
].dqi_format
= fmt
;
2113 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
2114 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
2115 mutex_lock(&dqopt
->dqio_mutex
);
2116 error
= dqopt
->ops
[type
]->read_file_info(sb
, type
);
2118 mutex_unlock(&dqopt
->dqio_mutex
);
2121 mutex_unlock(&dqopt
->dqio_mutex
);
2122 spin_lock(&dq_state_lock
);
2123 dqopt
->flags
|= dquot_state_flag(flags
, type
);
2124 spin_unlock(&dq_state_lock
);
2126 add_dquot_ref(sb
, type
);
2127 mutex_unlock(&dqopt
->dqonoff_mutex
);
2132 dqopt
->files
[type
] = NULL
;
2135 if (oldflags
!= -1) {
2136 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
2137 /* Set the flags back (in the case of accidental quotaon()
2138 * on a wrong file we don't want to mess up the flags) */
2139 inode
->i_flags
&= ~(S_NOATIME
| S_NOQUOTA
| S_IMMUTABLE
);
2140 inode
->i_flags
|= oldflags
;
2141 mutex_unlock(&inode
->i_mutex
);
2143 mutex_unlock(&dqopt
->dqonoff_mutex
);
2145 put_quota_format(fmt
);
2150 /* Reenable quotas on remount RW */
2151 int dquot_resume(struct super_block
*sb
, int type
)
2153 struct quota_info
*dqopt
= sb_dqopt(sb
);
2154 struct inode
*inode
;
2158 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2159 if (type
!= -1 && cnt
!= type
)
2162 mutex_lock(&dqopt
->dqonoff_mutex
);
2163 if (!sb_has_quota_suspended(sb
, cnt
)) {
2164 mutex_unlock(&dqopt
->dqonoff_mutex
);
2167 inode
= dqopt
->files
[cnt
];
2168 dqopt
->files
[cnt
] = NULL
;
2169 spin_lock(&dq_state_lock
);
2170 flags
= dqopt
->flags
& dquot_state_flag(DQUOT_USAGE_ENABLED
|
2171 DQUOT_LIMITS_ENABLED
,
2173 dqopt
->flags
&= ~dquot_state_flag(DQUOT_STATE_FLAGS
, cnt
);
2174 spin_unlock(&dq_state_lock
);
2175 mutex_unlock(&dqopt
->dqonoff_mutex
);
2177 flags
= dquot_generic_flag(flags
, cnt
);
2178 ret
= vfs_load_quota_inode(inode
, cnt
,
2179 dqopt
->info
[cnt
].dqi_fmt_id
, flags
);
2185 EXPORT_SYMBOL(dquot_resume
);
2187 int dquot_quota_on(struct super_block
*sb
, int type
, int format_id
,
2190 int error
= security_quota_on(path
->dentry
);
2193 /* Quota file not on the same filesystem? */
2194 if (path
->mnt
->mnt_sb
!= sb
)
2197 error
= vfs_load_quota_inode(path
->dentry
->d_inode
, type
,
2198 format_id
, DQUOT_USAGE_ENABLED
|
2199 DQUOT_LIMITS_ENABLED
);
2202 EXPORT_SYMBOL(dquot_quota_on
);
2205 * More powerful function for turning on quotas allowing setting
2206 * of individual quota flags
2208 int dquot_enable(struct inode
*inode
, int type
, int format_id
,
2212 struct super_block
*sb
= inode
->i_sb
;
2213 struct quota_info
*dqopt
= sb_dqopt(sb
);
2215 /* Just unsuspend quotas? */
2216 BUG_ON(flags
& DQUOT_SUSPENDED
);
2220 /* Just updating flags needed? */
2221 if (sb_has_quota_loaded(sb
, type
)) {
2222 mutex_lock(&dqopt
->dqonoff_mutex
);
2223 /* Now do a reliable test... */
2224 if (!sb_has_quota_loaded(sb
, type
)) {
2225 mutex_unlock(&dqopt
->dqonoff_mutex
);
2228 if (flags
& DQUOT_USAGE_ENABLED
&&
2229 sb_has_quota_usage_enabled(sb
, type
)) {
2233 if (flags
& DQUOT_LIMITS_ENABLED
&&
2234 sb_has_quota_limits_enabled(sb
, type
)) {
2238 spin_lock(&dq_state_lock
);
2239 sb_dqopt(sb
)->flags
|= dquot_state_flag(flags
, type
);
2240 spin_unlock(&dq_state_lock
);
2242 mutex_unlock(&dqopt
->dqonoff_mutex
);
2247 return vfs_load_quota_inode(inode
, type
, format_id
, flags
);
2249 EXPORT_SYMBOL(dquot_enable
);
2252 * This function is used when filesystem needs to initialize quotas
2253 * during mount time.
2255 int dquot_quota_on_mount(struct super_block
*sb
, char *qf_name
,
2256 int format_id
, int type
)
2258 struct dentry
*dentry
;
2261 mutex_lock(&sb
->s_root
->d_inode
->i_mutex
);
2262 dentry
= lookup_one_len(qf_name
, sb
->s_root
, strlen(qf_name
));
2263 mutex_unlock(&sb
->s_root
->d_inode
->i_mutex
);
2265 return PTR_ERR(dentry
);
2267 if (!dentry
->d_inode
) {
2272 error
= security_quota_on(dentry
);
2274 error
= vfs_load_quota_inode(dentry
->d_inode
, type
, format_id
,
2275 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2281 EXPORT_SYMBOL(dquot_quota_on_mount
);
2283 static inline qsize_t
qbtos(qsize_t blocks
)
2285 return blocks
<< QIF_DQBLKSIZE_BITS
;
2288 static inline qsize_t
stoqb(qsize_t space
)
2290 return (space
+ QIF_DQBLKSIZE
- 1) >> QIF_DQBLKSIZE_BITS
;
2293 /* Generic routine for getting common part of quota structure */
2294 static void do_get_dqblk(struct dquot
*dquot
, struct fs_disk_quota
*di
)
2296 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2298 memset(di
, 0, sizeof(*di
));
2299 di
->d_version
= FS_DQUOT_VERSION
;
2300 di
->d_flags
= dquot
->dq_type
== USRQUOTA
?
2301 FS_USER_QUOTA
: FS_GROUP_QUOTA
;
2302 di
->d_id
= dquot
->dq_id
;
2304 spin_lock(&dq_data_lock
);
2305 di
->d_blk_hardlimit
= stoqb(dm
->dqb_bhardlimit
);
2306 di
->d_blk_softlimit
= stoqb(dm
->dqb_bsoftlimit
);
2307 di
->d_ino_hardlimit
= dm
->dqb_ihardlimit
;
2308 di
->d_ino_softlimit
= dm
->dqb_isoftlimit
;
2309 di
->d_bcount
= dm
->dqb_curspace
+ dm
->dqb_rsvspace
;
2310 di
->d_icount
= dm
->dqb_curinodes
;
2311 di
->d_btimer
= dm
->dqb_btime
;
2312 di
->d_itimer
= dm
->dqb_itime
;
2313 spin_unlock(&dq_data_lock
);
2316 int dquot_get_dqblk(struct super_block
*sb
, int type
, qid_t id
,
2317 struct fs_disk_quota
*di
)
2319 struct dquot
*dquot
;
2321 dquot
= dqget(sb
, id
, type
);
2324 do_get_dqblk(dquot
, di
);
2329 EXPORT_SYMBOL(dquot_get_dqblk
);
2331 #define VFS_FS_DQ_MASK \
2332 (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \
2333 FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \
2334 FS_DQ_BTIMER | FS_DQ_ITIMER)
2336 /* Generic routine for setting common part of quota structure */
2337 static int do_set_dqblk(struct dquot
*dquot
, struct fs_disk_quota
*di
)
2339 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2340 int check_blim
= 0, check_ilim
= 0;
2341 struct mem_dqinfo
*dqi
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
2343 if (di
->d_fieldmask
& ~VFS_FS_DQ_MASK
)
2346 if (((di
->d_fieldmask
& FS_DQ_BSOFT
) &&
2347 (di
->d_blk_softlimit
> dqi
->dqi_maxblimit
)) ||
2348 ((di
->d_fieldmask
& FS_DQ_BHARD
) &&
2349 (di
->d_blk_hardlimit
> dqi
->dqi_maxblimit
)) ||
2350 ((di
->d_fieldmask
& FS_DQ_ISOFT
) &&
2351 (di
->d_ino_softlimit
> dqi
->dqi_maxilimit
)) ||
2352 ((di
->d_fieldmask
& FS_DQ_IHARD
) &&
2353 (di
->d_ino_hardlimit
> dqi
->dqi_maxilimit
)))
2356 spin_lock(&dq_data_lock
);
2357 if (di
->d_fieldmask
& FS_DQ_BCOUNT
) {
2358 dm
->dqb_curspace
= di
->d_bcount
- dm
->dqb_rsvspace
;
2360 set_bit(DQ_LASTSET_B
+ QIF_SPACE_B
, &dquot
->dq_flags
);
2363 if (di
->d_fieldmask
& FS_DQ_BSOFT
)
2364 dm
->dqb_bsoftlimit
= qbtos(di
->d_blk_softlimit
);
2365 if (di
->d_fieldmask
& FS_DQ_BHARD
)
2366 dm
->dqb_bhardlimit
= qbtos(di
->d_blk_hardlimit
);
2367 if (di
->d_fieldmask
& (FS_DQ_BSOFT
| FS_DQ_BHARD
)) {
2369 set_bit(DQ_LASTSET_B
+ QIF_BLIMITS_B
, &dquot
->dq_flags
);
2372 if (di
->d_fieldmask
& FS_DQ_ICOUNT
) {
2373 dm
->dqb_curinodes
= di
->d_icount
;
2375 set_bit(DQ_LASTSET_B
+ QIF_INODES_B
, &dquot
->dq_flags
);
2378 if (di
->d_fieldmask
& FS_DQ_ISOFT
)
2379 dm
->dqb_isoftlimit
= di
->d_ino_softlimit
;
2380 if (di
->d_fieldmask
& FS_DQ_IHARD
)
2381 dm
->dqb_ihardlimit
= di
->d_ino_hardlimit
;
2382 if (di
->d_fieldmask
& (FS_DQ_ISOFT
| FS_DQ_IHARD
)) {
2384 set_bit(DQ_LASTSET_B
+ QIF_ILIMITS_B
, &dquot
->dq_flags
);
2387 if (di
->d_fieldmask
& FS_DQ_BTIMER
) {
2388 dm
->dqb_btime
= di
->d_btimer
;
2390 set_bit(DQ_LASTSET_B
+ QIF_BTIME_B
, &dquot
->dq_flags
);
2393 if (di
->d_fieldmask
& FS_DQ_ITIMER
) {
2394 dm
->dqb_itime
= di
->d_itimer
;
2396 set_bit(DQ_LASTSET_B
+ QIF_ITIME_B
, &dquot
->dq_flags
);
2400 if (!dm
->dqb_bsoftlimit
||
2401 dm
->dqb_curspace
< dm
->dqb_bsoftlimit
) {
2403 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
2404 } else if (!(di
->d_fieldmask
& FS_DQ_BTIMER
))
2405 /* Set grace only if user hasn't provided his own... */
2406 dm
->dqb_btime
= get_seconds() + dqi
->dqi_bgrace
;
2409 if (!dm
->dqb_isoftlimit
||
2410 dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
2412 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
2413 } else if (!(di
->d_fieldmask
& FS_DQ_ITIMER
))
2414 /* Set grace only if user hasn't provided his own... */
2415 dm
->dqb_itime
= get_seconds() + dqi
->dqi_igrace
;
2417 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
||
2419 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2421 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2422 spin_unlock(&dq_data_lock
);
2423 mark_dquot_dirty(dquot
);
2428 int dquot_set_dqblk(struct super_block
*sb
, int type
, qid_t id
,
2429 struct fs_disk_quota
*di
)
2431 struct dquot
*dquot
;
2434 dquot
= dqget(sb
, id
, type
);
2439 rc
= do_set_dqblk(dquot
, di
);
2444 EXPORT_SYMBOL(dquot_set_dqblk
);
2446 /* Generic routine for getting common part of quota file information */
2447 int dquot_get_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2449 struct mem_dqinfo
*mi
;
2451 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2452 if (!sb_has_quota_active(sb
, type
)) {
2453 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2456 mi
= sb_dqopt(sb
)->info
+ type
;
2457 spin_lock(&dq_data_lock
);
2458 ii
->dqi_bgrace
= mi
->dqi_bgrace
;
2459 ii
->dqi_igrace
= mi
->dqi_igrace
;
2460 ii
->dqi_flags
= mi
->dqi_flags
& DQF_MASK
;
2461 ii
->dqi_valid
= IIF_ALL
;
2462 spin_unlock(&dq_data_lock
);
2463 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2466 EXPORT_SYMBOL(dquot_get_dqinfo
);
2468 /* Generic routine for setting common part of quota file information */
2469 int dquot_set_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2471 struct mem_dqinfo
*mi
;
2474 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2475 if (!sb_has_quota_active(sb
, type
)) {
2479 mi
= sb_dqopt(sb
)->info
+ type
;
2480 spin_lock(&dq_data_lock
);
2481 if (ii
->dqi_valid
& IIF_BGRACE
)
2482 mi
->dqi_bgrace
= ii
->dqi_bgrace
;
2483 if (ii
->dqi_valid
& IIF_IGRACE
)
2484 mi
->dqi_igrace
= ii
->dqi_igrace
;
2485 if (ii
->dqi_valid
& IIF_FLAGS
)
2486 mi
->dqi_flags
= (mi
->dqi_flags
& ~DQF_MASK
) |
2487 (ii
->dqi_flags
& DQF_MASK
);
2488 spin_unlock(&dq_data_lock
);
2489 mark_info_dirty(sb
, type
);
2490 /* Force write to disk */
2491 sb
->dq_op
->write_info(sb
, type
);
2493 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2496 EXPORT_SYMBOL(dquot_set_dqinfo
);
2498 const struct quotactl_ops dquot_quotactl_ops
= {
2499 .quota_on
= dquot_quota_on
,
2500 .quota_off
= dquot_quota_off
,
2501 .quota_sync
= dquot_quota_sync
,
2502 .get_info
= dquot_get_dqinfo
,
2503 .set_info
= dquot_set_dqinfo
,
2504 .get_dqblk
= dquot_get_dqblk
,
2505 .set_dqblk
= dquot_set_dqblk
2507 EXPORT_SYMBOL(dquot_quotactl_ops
);
2509 static int do_proc_dqstats(struct ctl_table
*table
, int write
,
2510 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2512 unsigned int type
= (int *)table
->data
- dqstats
.stat
;
2514 /* Update global table */
2515 dqstats
.stat
[type
] =
2516 percpu_counter_sum_positive(&dqstats
.counter
[type
]);
2517 return proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
2520 static ctl_table fs_dqstats_table
[] = {
2522 .procname
= "lookups",
2523 .data
= &dqstats
.stat
[DQST_LOOKUPS
],
2524 .maxlen
= sizeof(int),
2526 .proc_handler
= do_proc_dqstats
,
2529 .procname
= "drops",
2530 .data
= &dqstats
.stat
[DQST_DROPS
],
2531 .maxlen
= sizeof(int),
2533 .proc_handler
= do_proc_dqstats
,
2536 .procname
= "reads",
2537 .data
= &dqstats
.stat
[DQST_READS
],
2538 .maxlen
= sizeof(int),
2540 .proc_handler
= do_proc_dqstats
,
2543 .procname
= "writes",
2544 .data
= &dqstats
.stat
[DQST_WRITES
],
2545 .maxlen
= sizeof(int),
2547 .proc_handler
= do_proc_dqstats
,
2550 .procname
= "cache_hits",
2551 .data
= &dqstats
.stat
[DQST_CACHE_HITS
],
2552 .maxlen
= sizeof(int),
2554 .proc_handler
= do_proc_dqstats
,
2557 .procname
= "allocated_dquots",
2558 .data
= &dqstats
.stat
[DQST_ALLOC_DQUOTS
],
2559 .maxlen
= sizeof(int),
2561 .proc_handler
= do_proc_dqstats
,
2564 .procname
= "free_dquots",
2565 .data
= &dqstats
.stat
[DQST_FREE_DQUOTS
],
2566 .maxlen
= sizeof(int),
2568 .proc_handler
= do_proc_dqstats
,
2571 .procname
= "syncs",
2572 .data
= &dqstats
.stat
[DQST_SYNCS
],
2573 .maxlen
= sizeof(int),
2575 .proc_handler
= do_proc_dqstats
,
2577 #ifdef CONFIG_PRINT_QUOTA_WARNING
2579 .procname
= "warnings",
2580 .data
= &flag_print_warnings
,
2581 .maxlen
= sizeof(int),
2583 .proc_handler
= proc_dointvec
,
2589 static ctl_table fs_table
[] = {
2591 .procname
= "quota",
2593 .child
= fs_dqstats_table
,
2598 static ctl_table sys_table
[] = {
2607 static int __init
dquot_init(void)
2610 unsigned long nr_hash
, order
;
2612 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2614 register_sysctl_table(sys_table
);
2616 dquot_cachep
= kmem_cache_create("dquot",
2617 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2618 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2619 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2623 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
2625 panic("Cannot create dquot hash table");
2627 for (i
= 0; i
< _DQST_DQSTAT_LAST
; i
++) {
2628 ret
= percpu_counter_init(&dqstats
.counter
[i
], 0);
2630 panic("Cannot create dquot stat counters");
2633 /* Find power-of-two hlist_heads which can fit into allocation */
2634 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2638 } while (nr_hash
>> dq_hash_bits
);
2641 nr_hash
= 1UL << dq_hash_bits
;
2642 dq_hash_mask
= nr_hash
- 1;
2643 for (i
= 0; i
< nr_hash
; i
++)
2644 INIT_HLIST_HEAD(dquot_hash
+ i
);
2646 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2647 nr_hash
, order
, (PAGE_SIZE
<< order
));
2649 register_shrinker(&dqcache_shrinker
);
2653 module_init(dquot_init
);