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 "../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 * 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
)
445 int ret
= 0, ret2
= 0;
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
);
459 if (info_dirty(&dqopt
->info
[dquot
->dq_type
])) {
460 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(
461 dquot
->dq_sb
, dquot
->dq_type
);
467 mutex_unlock(&dqopt
->dqio_mutex
);
470 EXPORT_SYMBOL(dquot_commit
);
475 int dquot_release(struct dquot
*dquot
)
477 int ret
= 0, ret2
= 0;
478 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
480 mutex_lock(&dquot
->dq_lock
);
481 /* Check whether we are not racing with some other dqget() */
482 if (atomic_read(&dquot
->dq_count
) > 1)
484 mutex_lock(&dqopt
->dqio_mutex
);
485 if (dqopt
->ops
[dquot
->dq_type
]->release_dqblk
) {
486 ret
= dqopt
->ops
[dquot
->dq_type
]->release_dqblk(dquot
);
488 if (info_dirty(&dqopt
->info
[dquot
->dq_type
])) {
489 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(
490 dquot
->dq_sb
, dquot
->dq_type
);
495 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
496 mutex_unlock(&dqopt
->dqio_mutex
);
498 mutex_unlock(&dquot
->dq_lock
);
501 EXPORT_SYMBOL(dquot_release
);
503 void dquot_destroy(struct dquot
*dquot
)
505 kmem_cache_free(dquot_cachep
, dquot
);
507 EXPORT_SYMBOL(dquot_destroy
);
509 static inline void do_destroy_dquot(struct dquot
*dquot
)
511 dquot
->dq_sb
->dq_op
->destroy_dquot(dquot
);
514 /* Invalidate all dquots on the list. Note that this function is called after
515 * quota is disabled and pointers from inodes removed so there cannot be new
516 * quota users. There can still be some users of quotas due to inodes being
517 * just deleted or pruned by prune_icache() (those are not attached to any
518 * list) or parallel quotactl call. We have to wait for such users.
520 static void invalidate_dquots(struct super_block
*sb
, int type
)
522 struct dquot
*dquot
, *tmp
;
525 spin_lock(&dq_list_lock
);
526 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
527 if (dquot
->dq_sb
!= sb
)
529 if (dquot
->dq_type
!= type
)
531 /* Wait for dquot users */
532 if (atomic_read(&dquot
->dq_count
)) {
535 atomic_inc(&dquot
->dq_count
);
536 prepare_to_wait(&dquot
->dq_wait_unused
, &wait
,
537 TASK_UNINTERRUPTIBLE
);
538 spin_unlock(&dq_list_lock
);
539 /* Once dqput() wakes us up, we know it's time to free
541 * IMPORTANT: we rely on the fact that there is always
542 * at most one process waiting for dquot to free.
543 * Otherwise dq_count would be > 1 and we would never
546 if (atomic_read(&dquot
->dq_count
) > 1)
548 finish_wait(&dquot
->dq_wait_unused
, &wait
);
550 /* At this moment dquot() need not exist (it could be
551 * reclaimed by prune_dqcache(). Hence we must
556 * Quota now has no users and it has been written on last
559 remove_dquot_hash(dquot
);
560 remove_free_dquot(dquot
);
562 do_destroy_dquot(dquot
);
564 spin_unlock(&dq_list_lock
);
567 /* Call callback for every active dquot on given filesystem */
568 int dquot_scan_active(struct super_block
*sb
,
569 int (*fn
)(struct dquot
*dquot
, unsigned long priv
),
572 struct dquot
*dquot
, *old_dquot
= NULL
;
575 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
576 spin_lock(&dq_list_lock
);
577 list_for_each_entry(dquot
, &inuse_list
, dq_inuse
) {
578 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
580 if (dquot
->dq_sb
!= sb
)
582 /* Now we have active dquot so we can just increase use count */
583 atomic_inc(&dquot
->dq_count
);
584 spin_unlock(&dq_list_lock
);
585 dqstats_inc(DQST_LOOKUPS
);
588 ret
= fn(dquot
, priv
);
591 spin_lock(&dq_list_lock
);
592 /* We are safe to continue now because our dquot could not
593 * be moved out of the inuse list while we hold the reference */
595 spin_unlock(&dq_list_lock
);
598 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
601 EXPORT_SYMBOL(dquot_scan_active
);
603 int dquot_quota_sync(struct super_block
*sb
, int type
, int wait
)
605 struct list_head
*dirty
;
607 struct quota_info
*dqopt
= sb_dqopt(sb
);
610 mutex_lock(&dqopt
->dqonoff_mutex
);
611 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
612 if (type
!= -1 && cnt
!= type
)
614 if (!sb_has_quota_active(sb
, cnt
))
616 spin_lock(&dq_list_lock
);
617 dirty
= &dqopt
->info
[cnt
].dqi_dirty_list
;
618 while (!list_empty(dirty
)) {
619 dquot
= list_first_entry(dirty
, struct dquot
,
621 /* Dirty and inactive can be only bad dquot... */
622 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
623 clear_dquot_dirty(dquot
);
626 /* Now we have active dquot from which someone is
627 * holding reference so we can safely just increase
629 atomic_inc(&dquot
->dq_count
);
630 spin_unlock(&dq_list_lock
);
631 dqstats_inc(DQST_LOOKUPS
);
632 sb
->dq_op
->write_dquot(dquot
);
634 spin_lock(&dq_list_lock
);
636 spin_unlock(&dq_list_lock
);
639 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
640 if ((cnt
== type
|| type
== -1) && sb_has_quota_active(sb
, cnt
)
641 && info_dirty(&dqopt
->info
[cnt
]))
642 sb
->dq_op
->write_info(sb
, cnt
);
643 dqstats_inc(DQST_SYNCS
);
644 mutex_unlock(&dqopt
->dqonoff_mutex
);
646 if (!wait
|| (sb_dqopt(sb
)->flags
& DQUOT_QUOTA_SYS_FILE
))
649 /* This is not very clever (and fast) but currently I don't know about
650 * any other simple way of getting quota data to disk and we must get
651 * them there for userspace to be visible... */
652 if (sb
->s_op
->sync_fs
)
653 sb
->s_op
->sync_fs(sb
, 1);
654 sync_blockdev(sb
->s_bdev
);
657 * Now when everything is written we can discard the pagecache so
658 * that userspace sees the changes.
660 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
661 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
662 if (type
!= -1 && cnt
!= type
)
664 if (!sb_has_quota_active(sb
, cnt
))
666 mutex_lock_nested(&sb_dqopt(sb
)->files
[cnt
]->i_mutex
,
668 truncate_inode_pages(&sb_dqopt(sb
)->files
[cnt
]->i_data
, 0);
669 mutex_unlock(&sb_dqopt(sb
)->files
[cnt
]->i_mutex
);
671 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
675 EXPORT_SYMBOL(dquot_quota_sync
);
677 /* Free unused dquots from cache */
678 static void prune_dqcache(int count
)
680 struct list_head
*head
;
683 head
= free_dquots
.prev
;
684 while (head
!= &free_dquots
&& count
) {
685 dquot
= list_entry(head
, struct dquot
, dq_free
);
686 remove_dquot_hash(dquot
);
687 remove_free_dquot(dquot
);
689 do_destroy_dquot(dquot
);
691 head
= free_dquots
.prev
;
696 * This is called from kswapd when we think we need some
699 static int shrink_dqcache_memory(struct shrinker
*shrink
, int nr
, gfp_t gfp_mask
)
702 spin_lock(&dq_list_lock
);
704 spin_unlock(&dq_list_lock
);
707 percpu_counter_read_positive(&dqstats
.counter
[DQST_FREE_DQUOTS
])
708 /100) * sysctl_vfs_cache_pressure
;
711 static struct shrinker dqcache_shrinker
= {
712 .shrink
= shrink_dqcache_memory
,
713 .seeks
= DEFAULT_SEEKS
,
717 * Put reference to dquot
718 * NOTE: If you change this function please check whether dqput_blocks() works right...
720 void dqput(struct dquot
*dquot
)
726 #ifdef CONFIG_QUOTA_DEBUG
727 if (!atomic_read(&dquot
->dq_count
)) {
728 quota_error(dquot
->dq_sb
, "trying to free free dquot of %s %d",
729 quotatypes
[dquot
->dq_type
], dquot
->dq_id
);
733 dqstats_inc(DQST_DROPS
);
735 spin_lock(&dq_list_lock
);
736 if (atomic_read(&dquot
->dq_count
) > 1) {
737 /* We have more than one user... nothing to do */
738 atomic_dec(&dquot
->dq_count
);
739 /* Releasing dquot during quotaoff phase? */
740 if (!sb_has_quota_active(dquot
->dq_sb
, dquot
->dq_type
) &&
741 atomic_read(&dquot
->dq_count
) == 1)
742 wake_up(&dquot
->dq_wait_unused
);
743 spin_unlock(&dq_list_lock
);
746 /* Need to release dquot? */
747 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && dquot_dirty(dquot
)) {
748 spin_unlock(&dq_list_lock
);
749 /* Commit dquot before releasing */
750 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
752 quota_error(dquot
->dq_sb
, "Can't write quota structure"
753 " (error %d). Quota may get out of sync!",
756 * We clear dirty bit anyway, so that we avoid
759 spin_lock(&dq_list_lock
);
760 clear_dquot_dirty(dquot
);
761 spin_unlock(&dq_list_lock
);
765 /* Clear flag in case dquot was inactive (something bad happened) */
766 clear_dquot_dirty(dquot
);
767 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
768 spin_unlock(&dq_list_lock
);
769 dquot
->dq_sb
->dq_op
->release_dquot(dquot
);
772 atomic_dec(&dquot
->dq_count
);
773 #ifdef CONFIG_QUOTA_DEBUG
775 BUG_ON(!list_empty(&dquot
->dq_free
));
777 put_dquot_last(dquot
);
778 spin_unlock(&dq_list_lock
);
780 EXPORT_SYMBOL(dqput
);
782 struct dquot
*dquot_alloc(struct super_block
*sb
, int type
)
784 return kmem_cache_zalloc(dquot_cachep
, GFP_NOFS
);
786 EXPORT_SYMBOL(dquot_alloc
);
788 static struct dquot
*get_empty_dquot(struct super_block
*sb
, int type
)
792 dquot
= sb
->dq_op
->alloc_dquot(sb
, type
);
796 mutex_init(&dquot
->dq_lock
);
797 INIT_LIST_HEAD(&dquot
->dq_free
);
798 INIT_LIST_HEAD(&dquot
->dq_inuse
);
799 INIT_HLIST_NODE(&dquot
->dq_hash
);
800 INIT_LIST_HEAD(&dquot
->dq_dirty
);
801 init_waitqueue_head(&dquot
->dq_wait_unused
);
803 dquot
->dq_type
= type
;
804 atomic_set(&dquot
->dq_count
, 1);
810 * Get reference to dquot
812 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
813 * destroying our dquot by:
814 * a) checking for quota flags under dq_list_lock and
815 * b) getting a reference to dquot before we release dq_list_lock
817 struct dquot
*dqget(struct super_block
*sb
, unsigned int id
, int type
)
819 unsigned int hashent
= hashfn(sb
, id
, type
);
820 struct dquot
*dquot
= NULL
, *empty
= NULL
;
822 if (!sb_has_quota_active(sb
, type
))
825 spin_lock(&dq_list_lock
);
826 spin_lock(&dq_state_lock
);
827 if (!sb_has_quota_active(sb
, type
)) {
828 spin_unlock(&dq_state_lock
);
829 spin_unlock(&dq_list_lock
);
832 spin_unlock(&dq_state_lock
);
834 dquot
= find_dquot(hashent
, sb
, id
, type
);
837 spin_unlock(&dq_list_lock
);
838 empty
= get_empty_dquot(sb
, type
);
840 schedule(); /* Try to wait for a moment... */
846 /* all dquots go on the inuse_list */
848 /* hash it first so it can be found */
849 insert_dquot_hash(dquot
);
850 spin_unlock(&dq_list_lock
);
851 dqstats_inc(DQST_LOOKUPS
);
853 if (!atomic_read(&dquot
->dq_count
))
854 remove_free_dquot(dquot
);
855 atomic_inc(&dquot
->dq_count
);
856 spin_unlock(&dq_list_lock
);
857 dqstats_inc(DQST_CACHE_HITS
);
858 dqstats_inc(DQST_LOOKUPS
);
860 /* Wait for dq_lock - after this we know that either dquot_release() is
861 * already finished or it will be canceled due to dq_count > 1 test */
862 wait_on_dquot(dquot
);
863 /* Read the dquot / allocate space in quota file */
864 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) &&
865 sb
->dq_op
->acquire_dquot(dquot
) < 0) {
870 #ifdef CONFIG_QUOTA_DEBUG
871 BUG_ON(!dquot
->dq_sb
); /* Has somebody invalidated entry under us? */
875 do_destroy_dquot(empty
);
879 EXPORT_SYMBOL(dqget
);
881 static int dqinit_needed(struct inode
*inode
, int type
)
885 if (IS_NOQUOTA(inode
))
888 return !inode
->i_dquot
[type
];
889 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
890 if (!inode
->i_dquot
[cnt
])
895 /* This routine is guarded by dqonoff_mutex mutex */
896 static void add_dquot_ref(struct super_block
*sb
, int type
)
898 struct inode
*inode
, *old_inode
= NULL
;
899 #ifdef CONFIG_QUOTA_DEBUG
903 spin_lock(&inode_sb_list_lock
);
904 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
905 spin_lock(&inode
->i_lock
);
906 if ((inode
->i_state
& (I_FREEING
|I_WILL_FREE
|I_NEW
)) ||
907 !atomic_read(&inode
->i_writecount
) ||
908 !dqinit_needed(inode
, type
)) {
909 spin_unlock(&inode
->i_lock
);
912 #ifdef CONFIG_QUOTA_DEBUG
913 if (unlikely(inode_get_rsv_space(inode
) > 0))
917 spin_unlock(&inode
->i_lock
);
918 spin_unlock(&inode_sb_list_lock
);
921 __dquot_initialize(inode
, type
);
924 * We hold a reference to 'inode' so it couldn't have been
925 * removed from s_inodes list while we dropped the
926 * inode_sb_list_lock We cannot iput the inode now as we can be
927 * holding the last reference and we cannot iput it under
928 * inode_sb_list_lock. So we keep the reference and iput it
932 spin_lock(&inode_sb_list_lock
);
934 spin_unlock(&inode_sb_list_lock
);
937 #ifdef CONFIG_QUOTA_DEBUG
939 quota_error(sb
, "Writes happened before quota was turned on "
940 "thus quota information is probably inconsistent. "
941 "Please run quotacheck(8)");
947 * Return 0 if dqput() won't block.
948 * (note that 1 doesn't necessarily mean blocking)
950 static inline int dqput_blocks(struct dquot
*dquot
)
952 if (atomic_read(&dquot
->dq_count
) <= 1)
958 * Remove references to dquots from inode and add dquot to list for freeing
959 * if we have the last referece to dquot
960 * We can't race with anybody because we hold dqptr_sem for writing...
962 static int remove_inode_dquot_ref(struct inode
*inode
, int type
,
963 struct list_head
*tofree_head
)
965 struct dquot
*dquot
= inode
->i_dquot
[type
];
967 inode
->i_dquot
[type
] = NULL
;
969 if (dqput_blocks(dquot
)) {
970 #ifdef CONFIG_QUOTA_DEBUG
971 if (atomic_read(&dquot
->dq_count
) != 1)
972 quota_error(inode
->i_sb
, "Adding dquot with "
973 "dq_count %d to dispose list",
974 atomic_read(&dquot
->dq_count
));
976 spin_lock(&dq_list_lock
);
977 /* As dquot must have currently users it can't be on
978 * the free list... */
979 list_add(&dquot
->dq_free
, tofree_head
);
980 spin_unlock(&dq_list_lock
);
984 dqput(dquot
); /* We have guaranteed we won't block */
990 * Free list of dquots
991 * Dquots are removed from inodes and no new references can be got so we are
992 * the only ones holding reference
994 static void put_dquot_list(struct list_head
*tofree_head
)
996 struct list_head
*act_head
;
999 act_head
= tofree_head
->next
;
1000 while (act_head
!= tofree_head
) {
1001 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
1002 act_head
= act_head
->next
;
1003 /* Remove dquot from the list so we won't have problems... */
1004 list_del_init(&dquot
->dq_free
);
1009 static void remove_dquot_ref(struct super_block
*sb
, int type
,
1010 struct list_head
*tofree_head
)
1012 struct inode
*inode
;
1015 spin_lock(&inode_sb_list_lock
);
1016 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
1018 * We have to scan also I_NEW inodes because they can already
1019 * have quota pointer initialized. Luckily, we need to touch
1020 * only quota pointers and these have separate locking
1023 if (!IS_NOQUOTA(inode
)) {
1024 if (unlikely(inode_get_rsv_space(inode
) > 0))
1026 remove_inode_dquot_ref(inode
, type
, tofree_head
);
1029 spin_unlock(&inode_sb_list_lock
);
1030 #ifdef CONFIG_QUOTA_DEBUG
1032 printk(KERN_WARNING
"VFS (%s): Writes happened after quota"
1033 " was disabled thus quota information is probably "
1034 "inconsistent. Please run quotacheck(8).\n", sb
->s_id
);
1039 /* Gather all references from inodes and drop them */
1040 static void drop_dquot_ref(struct super_block
*sb
, int type
)
1042 LIST_HEAD(tofree_head
);
1045 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1046 remove_dquot_ref(sb
, type
, &tofree_head
);
1047 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1048 put_dquot_list(&tofree_head
);
1052 static inline void dquot_incr_inodes(struct dquot
*dquot
, qsize_t number
)
1054 dquot
->dq_dqb
.dqb_curinodes
+= number
;
1057 static inline void dquot_incr_space(struct dquot
*dquot
, qsize_t number
)
1059 dquot
->dq_dqb
.dqb_curspace
+= number
;
1062 static inline void dquot_resv_space(struct dquot
*dquot
, qsize_t number
)
1064 dquot
->dq_dqb
.dqb_rsvspace
+= number
;
1068 * Claim reserved quota space
1070 static void dquot_claim_reserved_space(struct dquot
*dquot
, qsize_t number
)
1072 if (dquot
->dq_dqb
.dqb_rsvspace
< number
) {
1074 number
= dquot
->dq_dqb
.dqb_rsvspace
;
1076 dquot
->dq_dqb
.dqb_curspace
+= number
;
1077 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1081 void dquot_free_reserved_space(struct dquot
*dquot
, qsize_t number
)
1083 if (dquot
->dq_dqb
.dqb_rsvspace
>= number
)
1084 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1087 dquot
->dq_dqb
.dqb_rsvspace
= 0;
1091 static void dquot_decr_inodes(struct dquot
*dquot
, qsize_t number
)
1093 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1094 dquot
->dq_dqb
.dqb_curinodes
>= number
)
1095 dquot
->dq_dqb
.dqb_curinodes
-= number
;
1097 dquot
->dq_dqb
.dqb_curinodes
= 0;
1098 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1099 dquot
->dq_dqb
.dqb_itime
= (time_t) 0;
1100 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
1103 static void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
1105 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1106 dquot
->dq_dqb
.dqb_curspace
>= number
)
1107 dquot
->dq_dqb
.dqb_curspace
-= number
;
1109 dquot
->dq_dqb
.dqb_curspace
= 0;
1110 if (dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1111 dquot
->dq_dqb
.dqb_btime
= (time_t) 0;
1112 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1115 static int warning_issued(struct dquot
*dquot
, const int warntype
)
1117 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
1118 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
1119 ((warntype
== QUOTA_NL_IHARDWARN
||
1120 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
1124 return test_and_set_bit(flag
, &dquot
->dq_flags
);
1127 #ifdef CONFIG_PRINT_QUOTA_WARNING
1128 static int flag_print_warnings
= 1;
1130 static int need_print_warning(struct dquot
*dquot
)
1132 if (!flag_print_warnings
)
1135 switch (dquot
->dq_type
) {
1137 return current_fsuid() == dquot
->dq_id
;
1139 return in_group_p(dquot
->dq_id
);
1144 /* Print warning to user which exceeded quota */
1145 static void print_warning(struct dquot
*dquot
, const int warntype
)
1148 struct tty_struct
*tty
;
1150 if (warntype
== QUOTA_NL_IHARDBELOW
||
1151 warntype
== QUOTA_NL_ISOFTBELOW
||
1152 warntype
== QUOTA_NL_BHARDBELOW
||
1153 warntype
== QUOTA_NL_BSOFTBELOW
|| !need_print_warning(dquot
))
1156 tty
= get_current_tty();
1159 tty_write_message(tty
, dquot
->dq_sb
->s_id
);
1160 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
1161 tty_write_message(tty
, ": warning, ");
1163 tty_write_message(tty
, ": write failed, ");
1164 tty_write_message(tty
, quotatypes
[dquot
->dq_type
]);
1166 case QUOTA_NL_IHARDWARN
:
1167 msg
= " file limit reached.\r\n";
1169 case QUOTA_NL_ISOFTLONGWARN
:
1170 msg
= " file quota exceeded too long.\r\n";
1172 case QUOTA_NL_ISOFTWARN
:
1173 msg
= " file quota exceeded.\r\n";
1175 case QUOTA_NL_BHARDWARN
:
1176 msg
= " block limit reached.\r\n";
1178 case QUOTA_NL_BSOFTLONGWARN
:
1179 msg
= " block quota exceeded too long.\r\n";
1181 case QUOTA_NL_BSOFTWARN
:
1182 msg
= " block quota exceeded.\r\n";
1185 tty_write_message(tty
, msg
);
1191 * Write warnings to the console and send warning messages over netlink.
1193 * Note that this function can sleep.
1195 static void flush_warnings(struct dquot
*const *dquots
, char *warntype
)
1200 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1202 if (dq
&& warntype
[i
] != QUOTA_NL_NOWARN
&&
1203 !warning_issued(dq
, warntype
[i
])) {
1204 #ifdef CONFIG_PRINT_QUOTA_WARNING
1205 print_warning(dq
, warntype
[i
]);
1207 quota_send_warning(dq
->dq_type
, dq
->dq_id
,
1208 dq
->dq_sb
->s_dev
, warntype
[i
]);
1213 static int ignore_hardlimit(struct dquot
*dquot
)
1215 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
1217 return capable(CAP_SYS_RESOURCE
) &&
1218 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
||
1219 !(info
->dqi_flags
& V1_DQF_RSQUASH
));
1222 /* needs dq_data_lock */
1223 static int check_idq(struct dquot
*dquot
, qsize_t inodes
, char *warntype
)
1225 qsize_t newinodes
= dquot
->dq_dqb
.dqb_curinodes
+ inodes
;
1227 *warntype
= QUOTA_NL_NOWARN
;
1228 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
) ||
1229 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1232 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1233 newinodes
> dquot
->dq_dqb
.dqb_ihardlimit
&&
1234 !ignore_hardlimit(dquot
)) {
1235 *warntype
= QUOTA_NL_IHARDWARN
;
1239 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1240 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1241 dquot
->dq_dqb
.dqb_itime
&&
1242 get_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1243 !ignore_hardlimit(dquot
)) {
1244 *warntype
= QUOTA_NL_ISOFTLONGWARN
;
1248 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1249 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1250 dquot
->dq_dqb
.dqb_itime
== 0) {
1251 *warntype
= QUOTA_NL_ISOFTWARN
;
1252 dquot
->dq_dqb
.dqb_itime
= get_seconds() +
1253 sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_igrace
;
1259 /* needs dq_data_lock */
1260 static int check_bdq(struct dquot
*dquot
, qsize_t space
, int prealloc
, char *warntype
)
1263 struct super_block
*sb
= dquot
->dq_sb
;
1265 *warntype
= QUOTA_NL_NOWARN
;
1266 if (!sb_has_quota_limits_enabled(sb
, dquot
->dq_type
) ||
1267 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1270 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
1273 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1274 tspace
> dquot
->dq_dqb
.dqb_bhardlimit
&&
1275 !ignore_hardlimit(dquot
)) {
1277 *warntype
= QUOTA_NL_BHARDWARN
;
1281 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1282 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1283 dquot
->dq_dqb
.dqb_btime
&&
1284 get_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1285 !ignore_hardlimit(dquot
)) {
1287 *warntype
= QUOTA_NL_BSOFTLONGWARN
;
1291 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1292 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1293 dquot
->dq_dqb
.dqb_btime
== 0) {
1295 *warntype
= QUOTA_NL_BSOFTWARN
;
1296 dquot
->dq_dqb
.dqb_btime
= get_seconds() +
1297 sb_dqopt(sb
)->info
[dquot
->dq_type
].dqi_bgrace
;
1301 * We don't allow preallocation to exceed softlimit so exceeding will
1310 static int info_idq_free(struct dquot
*dquot
, qsize_t inodes
)
1314 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1315 dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
||
1316 !sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
))
1317 return QUOTA_NL_NOWARN
;
1319 newinodes
= dquot
->dq_dqb
.dqb_curinodes
- inodes
;
1320 if (newinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1321 return QUOTA_NL_ISOFTBELOW
;
1322 if (dquot
->dq_dqb
.dqb_curinodes
>= dquot
->dq_dqb
.dqb_ihardlimit
&&
1323 newinodes
< dquot
->dq_dqb
.dqb_ihardlimit
)
1324 return QUOTA_NL_IHARDBELOW
;
1325 return QUOTA_NL_NOWARN
;
1328 static int info_bdq_free(struct dquot
*dquot
, qsize_t space
)
1330 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1331 dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1332 return QUOTA_NL_NOWARN
;
1334 if (dquot
->dq_dqb
.dqb_curspace
- space
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1335 return QUOTA_NL_BSOFTBELOW
;
1336 if (dquot
->dq_dqb
.dqb_curspace
>= dquot
->dq_dqb
.dqb_bhardlimit
&&
1337 dquot
->dq_dqb
.dqb_curspace
- space
< dquot
->dq_dqb
.dqb_bhardlimit
)
1338 return QUOTA_NL_BHARDBELOW
;
1339 return QUOTA_NL_NOWARN
;
1342 static int dquot_active(const struct inode
*inode
)
1344 struct super_block
*sb
= inode
->i_sb
;
1346 if (IS_NOQUOTA(inode
))
1348 return sb_any_quota_loaded(sb
) & ~sb_any_quota_suspended(sb
);
1352 * Initialize quota pointers in inode
1354 * We do things in a bit complicated way but by that we avoid calling
1355 * dqget() and thus filesystem callbacks under dqptr_sem.
1357 * It is better to call this function outside of any transaction as it
1358 * might need a lot of space in journal for dquot structure allocation.
1360 static void __dquot_initialize(struct inode
*inode
, int type
)
1362 unsigned int id
= 0;
1364 struct dquot
*got
[MAXQUOTAS
];
1365 struct super_block
*sb
= inode
->i_sb
;
1368 /* First test before acquiring mutex - solves deadlocks when we
1369 * re-enter the quota code and are already holding the mutex */
1370 if (!dquot_active(inode
))
1373 /* First get references to structures we might need. */
1374 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1376 if (type
!= -1 && cnt
!= type
)
1386 got
[cnt
] = dqget(sb
, id
, cnt
);
1389 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1390 if (IS_NOQUOTA(inode
))
1392 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1393 if (type
!= -1 && cnt
!= type
)
1395 /* Avoid races with quotaoff() */
1396 if (!sb_has_quota_active(sb
, cnt
))
1398 /* We could race with quotaon or dqget() could have failed */
1401 if (!inode
->i_dquot
[cnt
]) {
1402 inode
->i_dquot
[cnt
] = got
[cnt
];
1405 * Make quota reservation system happy if someone
1406 * did a write before quota was turned on
1408 rsv
= inode_get_rsv_space(inode
);
1410 dquot_resv_space(inode
->i_dquot
[cnt
], rsv
);
1414 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1415 /* Drop unused references */
1419 void dquot_initialize(struct inode
*inode
)
1421 __dquot_initialize(inode
, -1);
1423 EXPORT_SYMBOL(dquot_initialize
);
1426 * Release all quotas referenced by inode
1428 static void __dquot_drop(struct inode
*inode
)
1431 struct dquot
*put
[MAXQUOTAS
];
1433 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1434 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1435 put
[cnt
] = inode
->i_dquot
[cnt
];
1436 inode
->i_dquot
[cnt
] = NULL
;
1438 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1442 void dquot_drop(struct inode
*inode
)
1446 if (IS_NOQUOTA(inode
))
1450 * Test before calling to rule out calls from proc and such
1451 * where we are not allowed to block. Note that this is
1452 * actually reliable test even without the lock - the caller
1453 * must assure that nobody can come after the DQUOT_DROP and
1454 * add quota pointers back anyway.
1456 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1457 if (inode
->i_dquot
[cnt
])
1461 if (cnt
< MAXQUOTAS
)
1462 __dquot_drop(inode
);
1464 EXPORT_SYMBOL(dquot_drop
);
1467 * inode_reserved_space is managed internally by quota, and protected by
1468 * i_lock similar to i_blocks+i_bytes.
1470 static qsize_t
*inode_reserved_space(struct inode
* inode
)
1472 /* Filesystem must explicitly define it's own method in order to use
1473 * quota reservation interface */
1474 BUG_ON(!inode
->i_sb
->dq_op
->get_reserved_space
);
1475 return inode
->i_sb
->dq_op
->get_reserved_space(inode
);
1478 void inode_add_rsv_space(struct inode
*inode
, qsize_t number
)
1480 spin_lock(&inode
->i_lock
);
1481 *inode_reserved_space(inode
) += number
;
1482 spin_unlock(&inode
->i_lock
);
1484 EXPORT_SYMBOL(inode_add_rsv_space
);
1486 void inode_claim_rsv_space(struct inode
*inode
, qsize_t number
)
1488 spin_lock(&inode
->i_lock
);
1489 *inode_reserved_space(inode
) -= number
;
1490 __inode_add_bytes(inode
, number
);
1491 spin_unlock(&inode
->i_lock
);
1493 EXPORT_SYMBOL(inode_claim_rsv_space
);
1495 void inode_sub_rsv_space(struct inode
*inode
, qsize_t number
)
1497 spin_lock(&inode
->i_lock
);
1498 *inode_reserved_space(inode
) -= number
;
1499 spin_unlock(&inode
->i_lock
);
1501 EXPORT_SYMBOL(inode_sub_rsv_space
);
1503 static qsize_t
inode_get_rsv_space(struct inode
*inode
)
1507 if (!inode
->i_sb
->dq_op
->get_reserved_space
)
1509 spin_lock(&inode
->i_lock
);
1510 ret
= *inode_reserved_space(inode
);
1511 spin_unlock(&inode
->i_lock
);
1515 static void inode_incr_space(struct inode
*inode
, qsize_t number
,
1519 inode_add_rsv_space(inode
, number
);
1521 inode_add_bytes(inode
, number
);
1524 static void inode_decr_space(struct inode
*inode
, qsize_t number
, int reserve
)
1527 inode_sub_rsv_space(inode
, number
);
1529 inode_sub_bytes(inode
, number
);
1533 * This functions updates i_blocks+i_bytes fields and quota information
1534 * (together with appropriate checks).
1536 * NOTE: We absolutely rely on the fact that caller dirties the inode
1537 * (usually helpers in quotaops.h care about this) and holds a handle for
1538 * the current transaction so that dquot write and inode write go into the
1543 * This operation can block, but only after everything is updated
1545 int __dquot_alloc_space(struct inode
*inode
, qsize_t number
, int flags
)
1548 char warntype
[MAXQUOTAS
];
1549 int warn
= flags
& DQUOT_SPACE_WARN
;
1550 int reserve
= flags
& DQUOT_SPACE_RESERVE
;
1551 int nofail
= flags
& DQUOT_SPACE_NOFAIL
;
1554 * First test before acquiring mutex - solves deadlocks when we
1555 * re-enter the quota code and are already holding the mutex
1557 if (!dquot_active(inode
)) {
1558 inode_incr_space(inode
, number
, reserve
);
1562 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1563 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1564 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1566 spin_lock(&dq_data_lock
);
1567 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1568 if (!inode
->i_dquot
[cnt
])
1570 ret
= check_bdq(inode
->i_dquot
[cnt
], number
, !warn
,
1572 if (ret
&& !nofail
) {
1573 spin_unlock(&dq_data_lock
);
1574 goto out_flush_warn
;
1577 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1578 if (!inode
->i_dquot
[cnt
])
1581 dquot_resv_space(inode
->i_dquot
[cnt
], number
);
1583 dquot_incr_space(inode
->i_dquot
[cnt
], number
);
1585 inode_incr_space(inode
, number
, reserve
);
1586 spin_unlock(&dq_data_lock
);
1589 goto out_flush_warn
;
1590 mark_all_dquot_dirty(inode
->i_dquot
);
1592 flush_warnings(inode
->i_dquot
, warntype
);
1593 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1597 EXPORT_SYMBOL(__dquot_alloc_space
);
1600 * This operation can block, but only after everything is updated
1602 int dquot_alloc_inode(const struct inode
*inode
)
1605 char warntype
[MAXQUOTAS
];
1607 /* First test before acquiring mutex - solves deadlocks when we
1608 * re-enter the quota code and are already holding the mutex */
1609 if (!dquot_active(inode
))
1611 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1612 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1613 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1614 spin_lock(&dq_data_lock
);
1615 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1616 if (!inode
->i_dquot
[cnt
])
1618 ret
= check_idq(inode
->i_dquot
[cnt
], 1, warntype
+ cnt
);
1623 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1624 if (!inode
->i_dquot
[cnt
])
1626 dquot_incr_inodes(inode
->i_dquot
[cnt
], 1);
1630 spin_unlock(&dq_data_lock
);
1632 mark_all_dquot_dirty(inode
->i_dquot
);
1633 flush_warnings(inode
->i_dquot
, warntype
);
1634 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1637 EXPORT_SYMBOL(dquot_alloc_inode
);
1640 * Convert in-memory reserved quotas to real consumed quotas
1642 int dquot_claim_space_nodirty(struct inode
*inode
, qsize_t number
)
1646 if (!dquot_active(inode
)) {
1647 inode_claim_rsv_space(inode
, number
);
1651 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1652 spin_lock(&dq_data_lock
);
1653 /* Claim reserved quotas to allocated quotas */
1654 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1655 if (inode
->i_dquot
[cnt
])
1656 dquot_claim_reserved_space(inode
->i_dquot
[cnt
],
1659 /* Update inode bytes */
1660 inode_claim_rsv_space(inode
, number
);
1661 spin_unlock(&dq_data_lock
);
1662 mark_all_dquot_dirty(inode
->i_dquot
);
1663 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1666 EXPORT_SYMBOL(dquot_claim_space_nodirty
);
1669 * This operation can block, but only after everything is updated
1671 void __dquot_free_space(struct inode
*inode
, qsize_t number
, int flags
)
1674 char warntype
[MAXQUOTAS
];
1675 int reserve
= flags
& DQUOT_SPACE_RESERVE
;
1677 /* First test before acquiring mutex - solves deadlocks when we
1678 * re-enter the quota code and are already holding the mutex */
1679 if (!dquot_active(inode
)) {
1680 inode_decr_space(inode
, number
, reserve
);
1684 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1685 spin_lock(&dq_data_lock
);
1686 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1687 if (!inode
->i_dquot
[cnt
])
1689 warntype
[cnt
] = info_bdq_free(inode
->i_dquot
[cnt
], number
);
1691 dquot_free_reserved_space(inode
->i_dquot
[cnt
], number
);
1693 dquot_decr_space(inode
->i_dquot
[cnt
], number
);
1695 inode_decr_space(inode
, number
, reserve
);
1696 spin_unlock(&dq_data_lock
);
1700 mark_all_dquot_dirty(inode
->i_dquot
);
1702 flush_warnings(inode
->i_dquot
, warntype
);
1703 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1705 EXPORT_SYMBOL(__dquot_free_space
);
1708 * This operation can block, but only after everything is updated
1710 void dquot_free_inode(const struct inode
*inode
)
1713 char warntype
[MAXQUOTAS
];
1715 /* First test before acquiring mutex - solves deadlocks when we
1716 * re-enter the quota code and are already holding the mutex */
1717 if (!dquot_active(inode
))
1720 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1721 spin_lock(&dq_data_lock
);
1722 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1723 if (!inode
->i_dquot
[cnt
])
1725 warntype
[cnt
] = info_idq_free(inode
->i_dquot
[cnt
], 1);
1726 dquot_decr_inodes(inode
->i_dquot
[cnt
], 1);
1728 spin_unlock(&dq_data_lock
);
1729 mark_all_dquot_dirty(inode
->i_dquot
);
1730 flush_warnings(inode
->i_dquot
, warntype
);
1731 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1733 EXPORT_SYMBOL(dquot_free_inode
);
1736 * Transfer the number of inode and blocks from one diskquota to an other.
1737 * On success, dquot references in transfer_to are consumed and references
1738 * to original dquots that need to be released are placed there. On failure,
1739 * references are kept untouched.
1741 * This operation can block, but only after everything is updated
1742 * A transaction must be started when entering this function.
1745 int __dquot_transfer(struct inode
*inode
, struct dquot
**transfer_to
)
1747 qsize_t space
, cur_space
;
1748 qsize_t rsv_space
= 0;
1749 struct dquot
*transfer_from
[MAXQUOTAS
] = {};
1751 char is_valid
[MAXQUOTAS
] = {};
1752 char warntype_to
[MAXQUOTAS
];
1753 char warntype_from_inodes
[MAXQUOTAS
], warntype_from_space
[MAXQUOTAS
];
1755 /* First test before acquiring mutex - solves deadlocks when we
1756 * re-enter the quota code and are already holding the mutex */
1757 if (IS_NOQUOTA(inode
))
1759 /* Initialize the arrays */
1760 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1761 warntype_to
[cnt
] = QUOTA_NL_NOWARN
;
1762 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1763 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1764 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1767 spin_lock(&dq_data_lock
);
1768 cur_space
= inode_get_bytes(inode
);
1769 rsv_space
= inode_get_rsv_space(inode
);
1770 space
= cur_space
+ rsv_space
;
1771 /* Build the transfer_from list and check the limits */
1772 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1774 * Skip changes for same uid or gid or for turned off quota-type.
1776 if (!transfer_to
[cnt
])
1778 /* Avoid races with quotaoff() */
1779 if (!sb_has_quota_active(inode
->i_sb
, cnt
))
1782 transfer_from
[cnt
] = inode
->i_dquot
[cnt
];
1783 ret
= check_idq(transfer_to
[cnt
], 1, warntype_to
+ cnt
);
1786 ret
= check_bdq(transfer_to
[cnt
], space
, 0, warntype_to
+ cnt
);
1792 * Finally perform the needed transfer from transfer_from to transfer_to
1794 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1797 /* Due to IO error we might not have transfer_from[] structure */
1798 if (transfer_from
[cnt
]) {
1799 warntype_from_inodes
[cnt
] =
1800 info_idq_free(transfer_from
[cnt
], 1);
1801 warntype_from_space
[cnt
] =
1802 info_bdq_free(transfer_from
[cnt
], space
);
1803 dquot_decr_inodes(transfer_from
[cnt
], 1);
1804 dquot_decr_space(transfer_from
[cnt
], cur_space
);
1805 dquot_free_reserved_space(transfer_from
[cnt
],
1809 dquot_incr_inodes(transfer_to
[cnt
], 1);
1810 dquot_incr_space(transfer_to
[cnt
], cur_space
);
1811 dquot_resv_space(transfer_to
[cnt
], rsv_space
);
1813 inode
->i_dquot
[cnt
] = transfer_to
[cnt
];
1815 spin_unlock(&dq_data_lock
);
1816 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1818 mark_all_dquot_dirty(transfer_from
);
1819 mark_all_dquot_dirty(transfer_to
);
1820 flush_warnings(transfer_to
, warntype_to
);
1821 flush_warnings(transfer_from
, warntype_from_inodes
);
1822 flush_warnings(transfer_from
, warntype_from_space
);
1823 /* Pass back references to put */
1824 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1826 transfer_to
[cnt
] = transfer_from
[cnt
];
1829 spin_unlock(&dq_data_lock
);
1830 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1831 flush_warnings(transfer_to
, warntype_to
);
1834 EXPORT_SYMBOL(__dquot_transfer
);
1836 /* Wrapper for transferring ownership of an inode for uid/gid only
1837 * Called from FSXXX_setattr()
1839 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
1841 struct dquot
*transfer_to
[MAXQUOTAS
] = {};
1842 struct super_block
*sb
= inode
->i_sb
;
1845 if (!dquot_active(inode
))
1848 if (iattr
->ia_valid
& ATTR_UID
&& iattr
->ia_uid
!= inode
->i_uid
)
1849 transfer_to
[USRQUOTA
] = dqget(sb
, iattr
->ia_uid
, USRQUOTA
);
1850 if (iattr
->ia_valid
& ATTR_GID
&& iattr
->ia_gid
!= inode
->i_gid
)
1851 transfer_to
[GRPQUOTA
] = dqget(sb
, iattr
->ia_gid
, GRPQUOTA
);
1853 ret
= __dquot_transfer(inode
, transfer_to
);
1854 dqput_all(transfer_to
);
1857 EXPORT_SYMBOL(dquot_transfer
);
1860 * Write info of quota file to disk
1862 int dquot_commit_info(struct super_block
*sb
, int type
)
1865 struct quota_info
*dqopt
= sb_dqopt(sb
);
1867 mutex_lock(&dqopt
->dqio_mutex
);
1868 ret
= dqopt
->ops
[type
]->write_file_info(sb
, type
);
1869 mutex_unlock(&dqopt
->dqio_mutex
);
1872 EXPORT_SYMBOL(dquot_commit_info
);
1875 * Definitions of diskquota operations.
1877 const struct dquot_operations dquot_operations
= {
1878 .write_dquot
= dquot_commit
,
1879 .acquire_dquot
= dquot_acquire
,
1880 .release_dquot
= dquot_release
,
1881 .mark_dirty
= dquot_mark_dquot_dirty
,
1882 .write_info
= dquot_commit_info
,
1883 .alloc_dquot
= dquot_alloc
,
1884 .destroy_dquot
= dquot_destroy
,
1886 EXPORT_SYMBOL(dquot_operations
);
1889 * Generic helper for ->open on filesystems supporting disk quotas.
1891 int dquot_file_open(struct inode
*inode
, struct file
*file
)
1895 error
= generic_file_open(inode
, file
);
1896 if (!error
&& (file
->f_mode
& FMODE_WRITE
))
1897 dquot_initialize(inode
);
1900 EXPORT_SYMBOL(dquot_file_open
);
1903 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1905 int dquot_disable(struct super_block
*sb
, int type
, unsigned int flags
)
1908 struct quota_info
*dqopt
= sb_dqopt(sb
);
1909 struct inode
*toputinode
[MAXQUOTAS
];
1911 /* Cannot turn off usage accounting without turning off limits, or
1912 * suspend quotas and simultaneously turn quotas off. */
1913 if ((flags
& DQUOT_USAGE_ENABLED
&& !(flags
& DQUOT_LIMITS_ENABLED
))
1914 || (flags
& DQUOT_SUSPENDED
&& flags
& (DQUOT_LIMITS_ENABLED
|
1915 DQUOT_USAGE_ENABLED
)))
1918 /* We need to serialize quota_off() for device */
1919 mutex_lock(&dqopt
->dqonoff_mutex
);
1922 * Skip everything if there's nothing to do. We have to do this because
1923 * sometimes we are called when fill_super() failed and calling
1924 * sync_fs() in such cases does no good.
1926 if (!sb_any_quota_loaded(sb
)) {
1927 mutex_unlock(&dqopt
->dqonoff_mutex
);
1930 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1931 toputinode
[cnt
] = NULL
;
1932 if (type
!= -1 && cnt
!= type
)
1934 if (!sb_has_quota_loaded(sb
, cnt
))
1937 if (flags
& DQUOT_SUSPENDED
) {
1938 spin_lock(&dq_state_lock
);
1940 dquot_state_flag(DQUOT_SUSPENDED
, cnt
);
1941 spin_unlock(&dq_state_lock
);
1943 spin_lock(&dq_state_lock
);
1944 dqopt
->flags
&= ~dquot_state_flag(flags
, cnt
);
1945 /* Turning off suspended quotas? */
1946 if (!sb_has_quota_loaded(sb
, cnt
) &&
1947 sb_has_quota_suspended(sb
, cnt
)) {
1948 dqopt
->flags
&= ~dquot_state_flag(
1949 DQUOT_SUSPENDED
, cnt
);
1950 spin_unlock(&dq_state_lock
);
1951 iput(dqopt
->files
[cnt
]);
1952 dqopt
->files
[cnt
] = NULL
;
1955 spin_unlock(&dq_state_lock
);
1958 /* We still have to keep quota loaded? */
1959 if (sb_has_quota_loaded(sb
, cnt
) && !(flags
& DQUOT_SUSPENDED
))
1962 /* Note: these are blocking operations */
1963 drop_dquot_ref(sb
, cnt
);
1964 invalidate_dquots(sb
, cnt
);
1966 * Now all dquots should be invalidated, all writes done so we
1967 * should be only users of the info. No locks needed.
1969 if (info_dirty(&dqopt
->info
[cnt
]))
1970 sb
->dq_op
->write_info(sb
, cnt
);
1971 if (dqopt
->ops
[cnt
]->free_file_info
)
1972 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
1973 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
1975 toputinode
[cnt
] = dqopt
->files
[cnt
];
1976 if (!sb_has_quota_loaded(sb
, cnt
))
1977 dqopt
->files
[cnt
] = NULL
;
1978 dqopt
->info
[cnt
].dqi_flags
= 0;
1979 dqopt
->info
[cnt
].dqi_igrace
= 0;
1980 dqopt
->info
[cnt
].dqi_bgrace
= 0;
1981 dqopt
->ops
[cnt
] = NULL
;
1983 mutex_unlock(&dqopt
->dqonoff_mutex
);
1985 /* Skip syncing and setting flags if quota files are hidden */
1986 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
1989 /* Sync the superblock so that buffers with quota data are written to
1990 * disk (and so userspace sees correct data afterwards). */
1991 if (sb
->s_op
->sync_fs
)
1992 sb
->s_op
->sync_fs(sb
, 1);
1993 sync_blockdev(sb
->s_bdev
);
1994 /* Now the quota files are just ordinary files and we can set the
1995 * inode flags back. Moreover we discard the pagecache so that
1996 * userspace sees the writes we did bypassing the pagecache. We
1997 * must also discard the blockdev buffers so that we see the
1998 * changes done by userspace on the next quotaon() */
1999 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2000 if (toputinode
[cnt
]) {
2001 mutex_lock(&dqopt
->dqonoff_mutex
);
2002 /* If quota was reenabled in the meantime, we have
2004 if (!sb_has_quota_loaded(sb
, cnt
)) {
2005 mutex_lock_nested(&toputinode
[cnt
]->i_mutex
,
2007 toputinode
[cnt
]->i_flags
&= ~(S_IMMUTABLE
|
2008 S_NOATIME
| S_NOQUOTA
);
2009 truncate_inode_pages(&toputinode
[cnt
]->i_data
,
2011 mutex_unlock(&toputinode
[cnt
]->i_mutex
);
2012 mark_inode_dirty_sync(toputinode
[cnt
]);
2014 mutex_unlock(&dqopt
->dqonoff_mutex
);
2017 invalidate_bdev(sb
->s_bdev
);
2019 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2020 if (toputinode
[cnt
]) {
2021 /* On remount RO, we keep the inode pointer so that we
2022 * can reenable quota on the subsequent remount RW. We
2023 * have to check 'flags' variable and not use sb_has_
2024 * function because another quotaon / quotaoff could
2025 * change global state before we got here. We refuse
2026 * to suspend quotas when there is pending delete on
2027 * the quota file... */
2028 if (!(flags
& DQUOT_SUSPENDED
))
2029 iput(toputinode
[cnt
]);
2030 else if (!toputinode
[cnt
]->i_nlink
)
2035 EXPORT_SYMBOL(dquot_disable
);
2037 int dquot_quota_off(struct super_block
*sb
, int type
)
2039 return dquot_disable(sb
, type
,
2040 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2042 EXPORT_SYMBOL(dquot_quota_off
);
2045 * Turn quotas on on a device
2049 * Helper function to turn quotas on when we already have the inode of
2050 * quota file and no quota information is loaded.
2052 static int vfs_load_quota_inode(struct inode
*inode
, int type
, int format_id
,
2055 struct quota_format_type
*fmt
= find_quota_format(format_id
);
2056 struct super_block
*sb
= inode
->i_sb
;
2057 struct quota_info
*dqopt
= sb_dqopt(sb
);
2063 if (!S_ISREG(inode
->i_mode
)) {
2067 if (IS_RDONLY(inode
)) {
2071 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
) {
2075 /* Usage always has to be set... */
2076 if (!(flags
& DQUOT_USAGE_ENABLED
)) {
2081 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2082 /* As we bypass the pagecache we must now flush all the
2083 * dirty data and invalidate caches so that kernel sees
2084 * changes from userspace. It is not enough to just flush
2085 * the quota file since if blocksize < pagesize, invalidation
2086 * of the cache could fail because of other unrelated dirty
2088 sync_filesystem(sb
);
2089 invalidate_bdev(sb
->s_bdev
);
2091 mutex_lock(&dqopt
->dqonoff_mutex
);
2092 if (sb_has_quota_loaded(sb
, type
)) {
2097 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2098 /* We don't want quota and atime on quota files (deadlocks
2099 * possible) Also nobody should write to the file - we use
2100 * special IO operations which ignore the immutable bit. */
2101 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
2102 oldflags
= inode
->i_flags
& (S_NOATIME
| S_IMMUTABLE
|
2104 inode
->i_flags
|= S_NOQUOTA
| S_NOATIME
| S_IMMUTABLE
;
2105 mutex_unlock(&inode
->i_mutex
);
2107 * When S_NOQUOTA is set, remove dquot references as no more
2108 * references can be added
2110 __dquot_drop(inode
);
2114 dqopt
->files
[type
] = igrab(inode
);
2115 if (!dqopt
->files
[type
])
2118 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
2121 dqopt
->ops
[type
] = fmt
->qf_ops
;
2122 dqopt
->info
[type
].dqi_format
= fmt
;
2123 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
2124 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
2125 mutex_lock(&dqopt
->dqio_mutex
);
2126 error
= dqopt
->ops
[type
]->read_file_info(sb
, type
);
2128 mutex_unlock(&dqopt
->dqio_mutex
);
2131 mutex_unlock(&dqopt
->dqio_mutex
);
2132 spin_lock(&dq_state_lock
);
2133 dqopt
->flags
|= dquot_state_flag(flags
, type
);
2134 spin_unlock(&dq_state_lock
);
2136 add_dquot_ref(sb
, type
);
2137 mutex_unlock(&dqopt
->dqonoff_mutex
);
2142 dqopt
->files
[type
] = NULL
;
2145 if (oldflags
!= -1) {
2146 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
2147 /* Set the flags back (in the case of accidental quotaon()
2148 * on a wrong file we don't want to mess up the flags) */
2149 inode
->i_flags
&= ~(S_NOATIME
| S_NOQUOTA
| S_IMMUTABLE
);
2150 inode
->i_flags
|= oldflags
;
2151 mutex_unlock(&inode
->i_mutex
);
2153 mutex_unlock(&dqopt
->dqonoff_mutex
);
2155 put_quota_format(fmt
);
2160 /* Reenable quotas on remount RW */
2161 int dquot_resume(struct super_block
*sb
, int type
)
2163 struct quota_info
*dqopt
= sb_dqopt(sb
);
2164 struct inode
*inode
;
2168 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2169 if (type
!= -1 && cnt
!= type
)
2172 mutex_lock(&dqopt
->dqonoff_mutex
);
2173 if (!sb_has_quota_suspended(sb
, cnt
)) {
2174 mutex_unlock(&dqopt
->dqonoff_mutex
);
2177 inode
= dqopt
->files
[cnt
];
2178 dqopt
->files
[cnt
] = NULL
;
2179 spin_lock(&dq_state_lock
);
2180 flags
= dqopt
->flags
& dquot_state_flag(DQUOT_USAGE_ENABLED
|
2181 DQUOT_LIMITS_ENABLED
,
2183 dqopt
->flags
&= ~dquot_state_flag(DQUOT_STATE_FLAGS
, cnt
);
2184 spin_unlock(&dq_state_lock
);
2185 mutex_unlock(&dqopt
->dqonoff_mutex
);
2187 flags
= dquot_generic_flag(flags
, cnt
);
2188 ret
= vfs_load_quota_inode(inode
, cnt
,
2189 dqopt
->info
[cnt
].dqi_fmt_id
, flags
);
2195 EXPORT_SYMBOL(dquot_resume
);
2197 int dquot_quota_on(struct super_block
*sb
, int type
, int format_id
,
2200 int error
= security_quota_on(path
->dentry
);
2203 /* Quota file not on the same filesystem? */
2204 if (path
->mnt
->mnt_sb
!= sb
)
2207 error
= vfs_load_quota_inode(path
->dentry
->d_inode
, type
,
2208 format_id
, DQUOT_USAGE_ENABLED
|
2209 DQUOT_LIMITS_ENABLED
);
2212 EXPORT_SYMBOL(dquot_quota_on
);
2215 * More powerful function for turning on quotas allowing setting
2216 * of individual quota flags
2218 int dquot_enable(struct inode
*inode
, int type
, int format_id
,
2222 struct super_block
*sb
= inode
->i_sb
;
2223 struct quota_info
*dqopt
= sb_dqopt(sb
);
2225 /* Just unsuspend quotas? */
2226 BUG_ON(flags
& DQUOT_SUSPENDED
);
2230 /* Just updating flags needed? */
2231 if (sb_has_quota_loaded(sb
, type
)) {
2232 mutex_lock(&dqopt
->dqonoff_mutex
);
2233 /* Now do a reliable test... */
2234 if (!sb_has_quota_loaded(sb
, type
)) {
2235 mutex_unlock(&dqopt
->dqonoff_mutex
);
2238 if (flags
& DQUOT_USAGE_ENABLED
&&
2239 sb_has_quota_usage_enabled(sb
, type
)) {
2243 if (flags
& DQUOT_LIMITS_ENABLED
&&
2244 sb_has_quota_limits_enabled(sb
, type
)) {
2248 spin_lock(&dq_state_lock
);
2249 sb_dqopt(sb
)->flags
|= dquot_state_flag(flags
, type
);
2250 spin_unlock(&dq_state_lock
);
2252 mutex_unlock(&dqopt
->dqonoff_mutex
);
2257 return vfs_load_quota_inode(inode
, type
, format_id
, flags
);
2259 EXPORT_SYMBOL(dquot_enable
);
2262 * This function is used when filesystem needs to initialize quotas
2263 * during mount time.
2265 int dquot_quota_on_mount(struct super_block
*sb
, char *qf_name
,
2266 int format_id
, int type
)
2268 struct dentry
*dentry
;
2271 mutex_lock(&sb
->s_root
->d_inode
->i_mutex
);
2272 dentry
= lookup_one_len(qf_name
, sb
->s_root
, strlen(qf_name
));
2273 mutex_unlock(&sb
->s_root
->d_inode
->i_mutex
);
2275 return PTR_ERR(dentry
);
2277 if (!dentry
->d_inode
) {
2282 error
= security_quota_on(dentry
);
2284 error
= vfs_load_quota_inode(dentry
->d_inode
, type
, format_id
,
2285 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2291 EXPORT_SYMBOL(dquot_quota_on_mount
);
2293 static inline qsize_t
qbtos(qsize_t blocks
)
2295 return blocks
<< QIF_DQBLKSIZE_BITS
;
2298 static inline qsize_t
stoqb(qsize_t space
)
2300 return (space
+ QIF_DQBLKSIZE
- 1) >> QIF_DQBLKSIZE_BITS
;
2303 /* Generic routine for getting common part of quota structure */
2304 static void do_get_dqblk(struct dquot
*dquot
, struct fs_disk_quota
*di
)
2306 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2308 memset(di
, 0, sizeof(*di
));
2309 di
->d_version
= FS_DQUOT_VERSION
;
2310 di
->d_flags
= dquot
->dq_type
== USRQUOTA
?
2311 FS_USER_QUOTA
: FS_GROUP_QUOTA
;
2312 di
->d_id
= dquot
->dq_id
;
2314 spin_lock(&dq_data_lock
);
2315 di
->d_blk_hardlimit
= stoqb(dm
->dqb_bhardlimit
);
2316 di
->d_blk_softlimit
= stoqb(dm
->dqb_bsoftlimit
);
2317 di
->d_ino_hardlimit
= dm
->dqb_ihardlimit
;
2318 di
->d_ino_softlimit
= dm
->dqb_isoftlimit
;
2319 di
->d_bcount
= dm
->dqb_curspace
+ dm
->dqb_rsvspace
;
2320 di
->d_icount
= dm
->dqb_curinodes
;
2321 di
->d_btimer
= dm
->dqb_btime
;
2322 di
->d_itimer
= dm
->dqb_itime
;
2323 spin_unlock(&dq_data_lock
);
2326 int dquot_get_dqblk(struct super_block
*sb
, int type
, qid_t id
,
2327 struct fs_disk_quota
*di
)
2329 struct dquot
*dquot
;
2331 dquot
= dqget(sb
, id
, type
);
2334 do_get_dqblk(dquot
, di
);
2339 EXPORT_SYMBOL(dquot_get_dqblk
);
2341 #define VFS_FS_DQ_MASK \
2342 (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \
2343 FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \
2344 FS_DQ_BTIMER | FS_DQ_ITIMER)
2346 /* Generic routine for setting common part of quota structure */
2347 static int do_set_dqblk(struct dquot
*dquot
, struct fs_disk_quota
*di
)
2349 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2350 int check_blim
= 0, check_ilim
= 0;
2351 struct mem_dqinfo
*dqi
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
2353 if (di
->d_fieldmask
& ~VFS_FS_DQ_MASK
)
2356 if (((di
->d_fieldmask
& FS_DQ_BSOFT
) &&
2357 (di
->d_blk_softlimit
> dqi
->dqi_maxblimit
)) ||
2358 ((di
->d_fieldmask
& FS_DQ_BHARD
) &&
2359 (di
->d_blk_hardlimit
> dqi
->dqi_maxblimit
)) ||
2360 ((di
->d_fieldmask
& FS_DQ_ISOFT
) &&
2361 (di
->d_ino_softlimit
> dqi
->dqi_maxilimit
)) ||
2362 ((di
->d_fieldmask
& FS_DQ_IHARD
) &&
2363 (di
->d_ino_hardlimit
> dqi
->dqi_maxilimit
)))
2366 spin_lock(&dq_data_lock
);
2367 if (di
->d_fieldmask
& FS_DQ_BCOUNT
) {
2368 dm
->dqb_curspace
= di
->d_bcount
- dm
->dqb_rsvspace
;
2370 set_bit(DQ_LASTSET_B
+ QIF_SPACE_B
, &dquot
->dq_flags
);
2373 if (di
->d_fieldmask
& FS_DQ_BSOFT
)
2374 dm
->dqb_bsoftlimit
= qbtos(di
->d_blk_softlimit
);
2375 if (di
->d_fieldmask
& FS_DQ_BHARD
)
2376 dm
->dqb_bhardlimit
= qbtos(di
->d_blk_hardlimit
);
2377 if (di
->d_fieldmask
& (FS_DQ_BSOFT
| FS_DQ_BHARD
)) {
2379 set_bit(DQ_LASTSET_B
+ QIF_BLIMITS_B
, &dquot
->dq_flags
);
2382 if (di
->d_fieldmask
& FS_DQ_ICOUNT
) {
2383 dm
->dqb_curinodes
= di
->d_icount
;
2385 set_bit(DQ_LASTSET_B
+ QIF_INODES_B
, &dquot
->dq_flags
);
2388 if (di
->d_fieldmask
& FS_DQ_ISOFT
)
2389 dm
->dqb_isoftlimit
= di
->d_ino_softlimit
;
2390 if (di
->d_fieldmask
& FS_DQ_IHARD
)
2391 dm
->dqb_ihardlimit
= di
->d_ino_hardlimit
;
2392 if (di
->d_fieldmask
& (FS_DQ_ISOFT
| FS_DQ_IHARD
)) {
2394 set_bit(DQ_LASTSET_B
+ QIF_ILIMITS_B
, &dquot
->dq_flags
);
2397 if (di
->d_fieldmask
& FS_DQ_BTIMER
) {
2398 dm
->dqb_btime
= di
->d_btimer
;
2400 set_bit(DQ_LASTSET_B
+ QIF_BTIME_B
, &dquot
->dq_flags
);
2403 if (di
->d_fieldmask
& FS_DQ_ITIMER
) {
2404 dm
->dqb_itime
= di
->d_itimer
;
2406 set_bit(DQ_LASTSET_B
+ QIF_ITIME_B
, &dquot
->dq_flags
);
2410 if (!dm
->dqb_bsoftlimit
||
2411 dm
->dqb_curspace
< dm
->dqb_bsoftlimit
) {
2413 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
2414 } else if (!(di
->d_fieldmask
& FS_DQ_BTIMER
))
2415 /* Set grace only if user hasn't provided his own... */
2416 dm
->dqb_btime
= get_seconds() + dqi
->dqi_bgrace
;
2419 if (!dm
->dqb_isoftlimit
||
2420 dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
2422 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
2423 } else if (!(di
->d_fieldmask
& FS_DQ_ITIMER
))
2424 /* Set grace only if user hasn't provided his own... */
2425 dm
->dqb_itime
= get_seconds() + dqi
->dqi_igrace
;
2427 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
||
2429 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2431 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2432 spin_unlock(&dq_data_lock
);
2433 mark_dquot_dirty(dquot
);
2438 int dquot_set_dqblk(struct super_block
*sb
, int type
, qid_t id
,
2439 struct fs_disk_quota
*di
)
2441 struct dquot
*dquot
;
2444 dquot
= dqget(sb
, id
, type
);
2449 rc
= do_set_dqblk(dquot
, di
);
2454 EXPORT_SYMBOL(dquot_set_dqblk
);
2456 /* Generic routine for getting common part of quota file information */
2457 int dquot_get_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2459 struct mem_dqinfo
*mi
;
2461 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2462 if (!sb_has_quota_active(sb
, type
)) {
2463 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2466 mi
= sb_dqopt(sb
)->info
+ type
;
2467 spin_lock(&dq_data_lock
);
2468 ii
->dqi_bgrace
= mi
->dqi_bgrace
;
2469 ii
->dqi_igrace
= mi
->dqi_igrace
;
2470 ii
->dqi_flags
= mi
->dqi_flags
& DQF_MASK
;
2471 ii
->dqi_valid
= IIF_ALL
;
2472 spin_unlock(&dq_data_lock
);
2473 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2476 EXPORT_SYMBOL(dquot_get_dqinfo
);
2478 /* Generic routine for setting common part of quota file information */
2479 int dquot_set_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2481 struct mem_dqinfo
*mi
;
2484 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2485 if (!sb_has_quota_active(sb
, type
)) {
2489 mi
= sb_dqopt(sb
)->info
+ type
;
2490 spin_lock(&dq_data_lock
);
2491 if (ii
->dqi_valid
& IIF_BGRACE
)
2492 mi
->dqi_bgrace
= ii
->dqi_bgrace
;
2493 if (ii
->dqi_valid
& IIF_IGRACE
)
2494 mi
->dqi_igrace
= ii
->dqi_igrace
;
2495 if (ii
->dqi_valid
& IIF_FLAGS
)
2496 mi
->dqi_flags
= (mi
->dqi_flags
& ~DQF_MASK
) |
2497 (ii
->dqi_flags
& DQF_MASK
);
2498 spin_unlock(&dq_data_lock
);
2499 mark_info_dirty(sb
, type
);
2500 /* Force write to disk */
2501 sb
->dq_op
->write_info(sb
, type
);
2503 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2506 EXPORT_SYMBOL(dquot_set_dqinfo
);
2508 const struct quotactl_ops dquot_quotactl_ops
= {
2509 .quota_on
= dquot_quota_on
,
2510 .quota_off
= dquot_quota_off
,
2511 .quota_sync
= dquot_quota_sync
,
2512 .get_info
= dquot_get_dqinfo
,
2513 .set_info
= dquot_set_dqinfo
,
2514 .get_dqblk
= dquot_get_dqblk
,
2515 .set_dqblk
= dquot_set_dqblk
2517 EXPORT_SYMBOL(dquot_quotactl_ops
);
2519 static int do_proc_dqstats(struct ctl_table
*table
, int write
,
2520 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2522 unsigned int type
= (int *)table
->data
- dqstats
.stat
;
2524 /* Update global table */
2525 dqstats
.stat
[type
] =
2526 percpu_counter_sum_positive(&dqstats
.counter
[type
]);
2527 return proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
2530 static ctl_table fs_dqstats_table
[] = {
2532 .procname
= "lookups",
2533 .data
= &dqstats
.stat
[DQST_LOOKUPS
],
2534 .maxlen
= sizeof(int),
2536 .proc_handler
= do_proc_dqstats
,
2539 .procname
= "drops",
2540 .data
= &dqstats
.stat
[DQST_DROPS
],
2541 .maxlen
= sizeof(int),
2543 .proc_handler
= do_proc_dqstats
,
2546 .procname
= "reads",
2547 .data
= &dqstats
.stat
[DQST_READS
],
2548 .maxlen
= sizeof(int),
2550 .proc_handler
= do_proc_dqstats
,
2553 .procname
= "writes",
2554 .data
= &dqstats
.stat
[DQST_WRITES
],
2555 .maxlen
= sizeof(int),
2557 .proc_handler
= do_proc_dqstats
,
2560 .procname
= "cache_hits",
2561 .data
= &dqstats
.stat
[DQST_CACHE_HITS
],
2562 .maxlen
= sizeof(int),
2564 .proc_handler
= do_proc_dqstats
,
2567 .procname
= "allocated_dquots",
2568 .data
= &dqstats
.stat
[DQST_ALLOC_DQUOTS
],
2569 .maxlen
= sizeof(int),
2571 .proc_handler
= do_proc_dqstats
,
2574 .procname
= "free_dquots",
2575 .data
= &dqstats
.stat
[DQST_FREE_DQUOTS
],
2576 .maxlen
= sizeof(int),
2578 .proc_handler
= do_proc_dqstats
,
2581 .procname
= "syncs",
2582 .data
= &dqstats
.stat
[DQST_SYNCS
],
2583 .maxlen
= sizeof(int),
2585 .proc_handler
= do_proc_dqstats
,
2587 #ifdef CONFIG_PRINT_QUOTA_WARNING
2589 .procname
= "warnings",
2590 .data
= &flag_print_warnings
,
2591 .maxlen
= sizeof(int),
2593 .proc_handler
= proc_dointvec
,
2599 static ctl_table fs_table
[] = {
2601 .procname
= "quota",
2603 .child
= fs_dqstats_table
,
2608 static ctl_table sys_table
[] = {
2617 static int __init
dquot_init(void)
2620 unsigned long nr_hash
, order
;
2622 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2624 register_sysctl_table(sys_table
);
2626 dquot_cachep
= kmem_cache_create("dquot",
2627 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2628 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2629 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2633 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
2635 panic("Cannot create dquot hash table");
2637 for (i
= 0; i
< _DQST_DQSTAT_LAST
; i
++) {
2638 ret
= percpu_counter_init(&dqstats
.counter
[i
], 0);
2640 panic("Cannot create dquot stat counters");
2643 /* Find power-of-two hlist_heads which can fit into allocation */
2644 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2648 } while (nr_hash
>> dq_hash_bits
);
2651 nr_hash
= 1UL << dq_hash_bits
;
2652 dq_hash_mask
= nr_hash
- 1;
2653 for (i
= 0; i
< nr_hash
; i
++)
2654 INIT_HLIST_HEAD(dquot_hash
+ i
);
2656 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2657 nr_hash
, order
, (PAGE_SIZE
<< order
));
2659 register_shrinker(&dqcache_shrinker
);
2663 module_init(dquot_init
);