2 * Implementation of the diskquota system for the LINUX operating system. QUOTA
3 * is implemented using the BSD system call interface as the means of
4 * communication with the user level. This file contains the generic routines
5 * called by the different filesystems on allocation of an inode or block.
6 * These routines take care of the administration needed to have a consistent
7 * diskquota tracking system. The ideas of both user and group quotas are based
8 * on the Melbourne quota system as used on BSD derived systems. The internal
9 * implementation is based on one of the several variants of the LINUX
10 * inode-subsystem with added complexity of the diskquota system.
12 * Author: Marco van Wieringen <mvw@planets.elm.net>
14 * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
16 * Revised list management to avoid races
17 * -- Bill Hawes, <whawes@star.net>, 9/98
19 * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
20 * As the consequence the locking was moved from dquot_decr_...(),
21 * dquot_incr_...() to calling functions.
22 * invalidate_dquots() now writes modified dquots.
23 * Serialized quota_off() and quota_on() for mount point.
24 * Fixed a few bugs in grow_dquots().
25 * Fixed deadlock in write_dquot() - we no longer account quotas on
27 * remove_dquot_ref() moved to inode.c - it now traverses through inodes
28 * add_dquot_ref() restarts after blocking
29 * Added check for bogus uid and fixed check for group in quotactl.
30 * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
32 * Used struct list_head instead of own list struct
33 * Invalidation of referenced dquots is no longer possible
34 * Improved free_dquots list management
35 * Quota and i_blocks are now updated in one place to avoid races
36 * Warnings are now delayed so we won't block in critical section
37 * Write updated not to require dquot lock
38 * Jan Kara, <jack@suse.cz>, 9/2000
40 * Added dynamic quota structure allocation
41 * Jan Kara <jack@suse.cz> 12/2000
43 * Rewritten quota interface. Implemented new quota format and
44 * formats registering.
45 * Jan Kara, <jack@suse.cz>, 2001,2002
48 * Jan Kara, <jack@suse.cz>, 10/2002
50 * Added journalled quota support, fix lock inversion problems
51 * Jan Kara, <jack@suse.cz>, 2003,2004
53 * (C) Copyright 1994 - 1997 Marco van Wieringen
56 #include <linux/errno.h>
57 #include <linux/kernel.h>
59 #include <linux/mount.h>
61 #include <linux/time.h>
62 #include <linux/types.h>
63 #include <linux/string.h>
64 #include <linux/fcntl.h>
65 #include <linux/stat.h>
66 #include <linux/tty.h>
67 #include <linux/file.h>
68 #include <linux/slab.h>
69 #include <linux/sysctl.h>
70 #include <linux/init.h>
71 #include <linux/module.h>
72 #include <linux/proc_fs.h>
73 #include <linux/security.h>
74 #include <linux/sched.h>
75 #include <linux/kmod.h>
76 #include <linux/namei.h>
77 #include <linux/capability.h>
78 #include <linux/quotaops.h>
79 #include "../internal.h" /* ugh */
81 #include <linux/uaccess.h>
84 * There are three quota SMP locks. dq_list_lock protects all lists with quotas
86 * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
87 * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
88 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
89 * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
90 * modifications of quota state (on quotaon and quotaoff) and readers who care
91 * about latest values take it as well.
93 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
94 * dq_list_lock > dq_state_lock
96 * Note that some things (eg. sb pointer, type, id) doesn't change during
97 * the life of the dquot structure and so needn't to be protected by a lock
99 * Any operation working on dquots via inode pointers must hold dqptr_sem. If
100 * operation is just reading pointers from inode (or not using them at all) the
101 * read lock is enough. If pointers are altered function must hold write lock.
102 * Special care needs to be taken about S_NOQUOTA inode flag (marking that
103 * inode is a quota file). Functions adding pointers from inode to dquots have
104 * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they
105 * have to do all pointer modifications before dropping dqptr_sem. This makes
106 * sure they cannot race with quotaon which first sets S_NOQUOTA flag and
107 * then drops all pointers to dquots from an inode.
109 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
110 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
111 * Currently dquot is locked only when it is being read to memory (or space for
112 * it is being allocated) on the first dqget() and when it is being released on
113 * the last dqput(). The allocation and release oparations are serialized by
114 * the dq_lock and by checking the use count in dquot_release(). Write
115 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
116 * spinlock to internal buffers before writing.
118 * Lock ordering (including related VFS locks) is the following:
119 * dqonoff_mutex > i_mutex > journal_lock > dqptr_sem > dquot->dq_lock >
121 * dqonoff_mutex > i_mutex comes from dquot_quota_sync, dquot_enable, etc.
122 * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
123 * dqptr_sem. But filesystem has to count with the fact that functions such as
124 * dquot_alloc_space() acquire dqptr_sem and they usually have to be called
125 * from inside a transaction to keep filesystem consistency after a crash. Also
126 * filesystems usually want to do some IO on dquot from ->mark_dirty which is
127 * called with dqptr_sem held.
130 static __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_list_lock
);
131 static __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_state_lock
);
132 __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_data_lock
);
133 EXPORT_SYMBOL(dq_data_lock
);
135 void __quota_error(struct super_block
*sb
, const char *func
,
136 const char *fmt
, ...)
138 if (printk_ratelimit()) {
140 struct va_format vaf
;
147 printk(KERN_ERR
"Quota error (device %s): %s: %pV\n",
148 sb
->s_id
, func
, &vaf
);
153 EXPORT_SYMBOL(__quota_error
);
155 #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING)
156 static char *quotatypes
[] = INITQFNAMES
;
158 static struct quota_format_type
*quota_formats
; /* List of registered formats */
159 static struct quota_module_name module_names
[] = INIT_QUOTA_MODULE_NAMES
;
161 /* SLAB cache for dquot structures */
162 static struct kmem_cache
*dquot_cachep
;
164 int register_quota_format(struct quota_format_type
*fmt
)
166 spin_lock(&dq_list_lock
);
167 fmt
->qf_next
= quota_formats
;
169 spin_unlock(&dq_list_lock
);
172 EXPORT_SYMBOL(register_quota_format
);
174 void unregister_quota_format(struct quota_format_type
*fmt
)
176 struct quota_format_type
**actqf
;
178 spin_lock(&dq_list_lock
);
179 for (actqf
= "a_formats
; *actqf
&& *actqf
!= fmt
;
180 actqf
= &(*actqf
)->qf_next
)
183 *actqf
= (*actqf
)->qf_next
;
184 spin_unlock(&dq_list_lock
);
186 EXPORT_SYMBOL(unregister_quota_format
);
188 static struct quota_format_type
*find_quota_format(int id
)
190 struct quota_format_type
*actqf
;
192 spin_lock(&dq_list_lock
);
193 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
194 actqf
= actqf
->qf_next
)
196 if (!actqf
|| !try_module_get(actqf
->qf_owner
)) {
199 spin_unlock(&dq_list_lock
);
201 for (qm
= 0; module_names
[qm
].qm_fmt_id
&&
202 module_names
[qm
].qm_fmt_id
!= id
; qm
++)
204 if (!module_names
[qm
].qm_fmt_id
||
205 request_module(module_names
[qm
].qm_mod_name
))
208 spin_lock(&dq_list_lock
);
209 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
210 actqf
= actqf
->qf_next
)
212 if (actqf
&& !try_module_get(actqf
->qf_owner
))
215 spin_unlock(&dq_list_lock
);
219 static void put_quota_format(struct quota_format_type
*fmt
)
221 module_put(fmt
->qf_owner
);
225 * Dquot List Management:
226 * The quota code uses three lists for dquot management: the inuse_list,
227 * free_dquots, and dquot_hash[] array. A single dquot structure may be
228 * on all three lists, depending on its current state.
230 * All dquots are placed to the end of inuse_list when first created, and this
231 * list is used for invalidate operation, which must look at every dquot.
233 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
234 * and this list is searched whenever we need an available dquot. Dquots are
235 * removed from the list as soon as they are used again, and
236 * dqstats.free_dquots gives the number of dquots on the list. When
237 * dquot is invalidated it's completely released from memory.
239 * Dquots with a specific identity (device, type and id) are placed on
240 * one of the dquot_hash[] hash chains. The provides an efficient search
241 * mechanism to locate a specific dquot.
244 static LIST_HEAD(inuse_list
);
245 static LIST_HEAD(free_dquots
);
246 static unsigned int dq_hash_bits
, dq_hash_mask
;
247 static struct hlist_head
*dquot_hash
;
249 struct dqstats dqstats
;
250 EXPORT_SYMBOL(dqstats
);
252 static qsize_t
inode_get_rsv_space(struct inode
*inode
);
253 static void __dquot_initialize(struct inode
*inode
, int type
);
255 static inline unsigned int
256 hashfn(const struct super_block
*sb
, struct kqid qid
)
258 unsigned int id
= from_kqid(&init_user_ns
, qid
);
262 tmp
= (((unsigned long)sb
>>L1_CACHE_SHIFT
) ^ id
) * (MAXQUOTAS
- type
);
263 return (tmp
+ (tmp
>> dq_hash_bits
)) & dq_hash_mask
;
267 * Following list functions expect dq_list_lock to be held
269 static inline void insert_dquot_hash(struct dquot
*dquot
)
271 struct hlist_head
*head
;
272 head
= dquot_hash
+ hashfn(dquot
->dq_sb
, dquot
->dq_id
);
273 hlist_add_head(&dquot
->dq_hash
, head
);
276 static inline void remove_dquot_hash(struct dquot
*dquot
)
278 hlist_del_init(&dquot
->dq_hash
);
281 static struct dquot
*find_dquot(unsigned int hashent
, struct super_block
*sb
,
284 struct hlist_node
*node
;
287 hlist_for_each (node
, dquot_hash
+hashent
) {
288 dquot
= hlist_entry(node
, struct dquot
, dq_hash
);
289 if (dquot
->dq_sb
== sb
&& qid_eq(dquot
->dq_id
, qid
))
295 /* Add a dquot to the tail of the free list */
296 static inline void put_dquot_last(struct dquot
*dquot
)
298 list_add_tail(&dquot
->dq_free
, &free_dquots
);
299 dqstats_inc(DQST_FREE_DQUOTS
);
302 static inline void remove_free_dquot(struct dquot
*dquot
)
304 if (list_empty(&dquot
->dq_free
))
306 list_del_init(&dquot
->dq_free
);
307 dqstats_dec(DQST_FREE_DQUOTS
);
310 static inline void put_inuse(struct dquot
*dquot
)
312 /* We add to the back of inuse list so we don't have to restart
313 * when traversing this list and we block */
314 list_add_tail(&dquot
->dq_inuse
, &inuse_list
);
315 dqstats_inc(DQST_ALLOC_DQUOTS
);
318 static inline void remove_inuse(struct dquot
*dquot
)
320 dqstats_dec(DQST_ALLOC_DQUOTS
);
321 list_del(&dquot
->dq_inuse
);
324 * End of list functions needing dq_list_lock
327 static void wait_on_dquot(struct dquot
*dquot
)
329 mutex_lock(&dquot
->dq_lock
);
330 mutex_unlock(&dquot
->dq_lock
);
333 static inline int dquot_dirty(struct dquot
*dquot
)
335 return test_bit(DQ_MOD_B
, &dquot
->dq_flags
);
338 static inline int mark_dquot_dirty(struct dquot
*dquot
)
340 return dquot
->dq_sb
->dq_op
->mark_dirty(dquot
);
343 /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */
344 int dquot_mark_dquot_dirty(struct dquot
*dquot
)
348 /* If quota is dirty already, we don't have to acquire dq_list_lock */
349 if (test_bit(DQ_MOD_B
, &dquot
->dq_flags
))
352 spin_lock(&dq_list_lock
);
353 if (!test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
)) {
354 list_add(&dquot
->dq_dirty
, &sb_dqopt(dquot
->dq_sb
)->
355 info
[dquot
->dq_id
.type
].dqi_dirty_list
);
358 spin_unlock(&dq_list_lock
);
361 EXPORT_SYMBOL(dquot_mark_dquot_dirty
);
363 /* Dirtify all the dquots - this can block when journalling */
364 static inline int mark_all_dquot_dirty(struct dquot
* const *dquot
)
369 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
371 /* Even in case of error we have to continue */
372 ret
= mark_dquot_dirty(dquot
[cnt
]);
379 static inline void dqput_all(struct dquot
**dquot
)
383 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
387 /* This function needs dq_list_lock */
388 static inline int clear_dquot_dirty(struct dquot
*dquot
)
390 if (!test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
))
392 list_del_init(&dquot
->dq_dirty
);
396 void mark_info_dirty(struct super_block
*sb
, int type
)
398 set_bit(DQF_INFO_DIRTY_B
, &sb_dqopt(sb
)->info
[type
].dqi_flags
);
400 EXPORT_SYMBOL(mark_info_dirty
);
403 * Read dquot from disk and alloc space for it
406 int dquot_acquire(struct dquot
*dquot
)
408 int ret
= 0, ret2
= 0;
409 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
411 mutex_lock(&dquot
->dq_lock
);
412 mutex_lock(&dqopt
->dqio_mutex
);
413 if (!test_bit(DQ_READ_B
, &dquot
->dq_flags
))
414 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->read_dqblk(dquot
);
417 set_bit(DQ_READ_B
, &dquot
->dq_flags
);
418 /* Instantiate dquot if needed */
419 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && !dquot
->dq_off
) {
420 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->commit_dqblk(dquot
);
421 /* Write the info if needed */
422 if (info_dirty(&dqopt
->info
[dquot
->dq_id
.type
])) {
423 ret2
= dqopt
->ops
[dquot
->dq_id
.type
]->write_file_info(
424 dquot
->dq_sb
, dquot
->dq_id
.type
);
433 set_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
435 mutex_unlock(&dqopt
->dqio_mutex
);
436 mutex_unlock(&dquot
->dq_lock
);
439 EXPORT_SYMBOL(dquot_acquire
);
442 * Write dquot to disk
444 int dquot_commit(struct dquot
*dquot
)
447 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
449 mutex_lock(&dqopt
->dqio_mutex
);
450 spin_lock(&dq_list_lock
);
451 if (!clear_dquot_dirty(dquot
)) {
452 spin_unlock(&dq_list_lock
);
455 spin_unlock(&dq_list_lock
);
456 /* Inactive dquot can be only if there was error during read/init
457 * => we have better not writing it */
458 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
459 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->commit_dqblk(dquot
);
463 mutex_unlock(&dqopt
->dqio_mutex
);
466 EXPORT_SYMBOL(dquot_commit
);
471 int dquot_release(struct dquot
*dquot
)
473 int ret
= 0, ret2
= 0;
474 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
476 mutex_lock(&dquot
->dq_lock
);
477 /* Check whether we are not racing with some other dqget() */
478 if (atomic_read(&dquot
->dq_count
) > 1)
480 mutex_lock(&dqopt
->dqio_mutex
);
481 if (dqopt
->ops
[dquot
->dq_id
.type
]->release_dqblk
) {
482 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->release_dqblk(dquot
);
484 if (info_dirty(&dqopt
->info
[dquot
->dq_id
.type
])) {
485 ret2
= dqopt
->ops
[dquot
->dq_id
.type
]->write_file_info(
486 dquot
->dq_sb
, dquot
->dq_id
.type
);
491 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
492 mutex_unlock(&dqopt
->dqio_mutex
);
494 mutex_unlock(&dquot
->dq_lock
);
497 EXPORT_SYMBOL(dquot_release
);
499 void dquot_destroy(struct dquot
*dquot
)
501 kmem_cache_free(dquot_cachep
, dquot
);
503 EXPORT_SYMBOL(dquot_destroy
);
505 static inline void do_destroy_dquot(struct dquot
*dquot
)
507 dquot
->dq_sb
->dq_op
->destroy_dquot(dquot
);
510 /* Invalidate all dquots on the list. Note that this function is called after
511 * quota is disabled and pointers from inodes removed so there cannot be new
512 * quota users. There can still be some users of quotas due to inodes being
513 * just deleted or pruned by prune_icache() (those are not attached to any
514 * list) or parallel quotactl call. We have to wait for such users.
516 static void invalidate_dquots(struct super_block
*sb
, int type
)
518 struct dquot
*dquot
, *tmp
;
521 spin_lock(&dq_list_lock
);
522 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
523 if (dquot
->dq_sb
!= sb
)
525 if (dquot
->dq_id
.type
!= type
)
527 /* Wait for dquot users */
528 if (atomic_read(&dquot
->dq_count
)) {
531 atomic_inc(&dquot
->dq_count
);
532 prepare_to_wait(&dquot
->dq_wait_unused
, &wait
,
533 TASK_UNINTERRUPTIBLE
);
534 spin_unlock(&dq_list_lock
);
535 /* Once dqput() wakes us up, we know it's time to free
537 * IMPORTANT: we rely on the fact that there is always
538 * at most one process waiting for dquot to free.
539 * Otherwise dq_count would be > 1 and we would never
542 if (atomic_read(&dquot
->dq_count
) > 1)
544 finish_wait(&dquot
->dq_wait_unused
, &wait
);
546 /* At this moment dquot() need not exist (it could be
547 * reclaimed by prune_dqcache(). Hence we must
552 * Quota now has no users and it has been written on last
555 remove_dquot_hash(dquot
);
556 remove_free_dquot(dquot
);
558 do_destroy_dquot(dquot
);
560 spin_unlock(&dq_list_lock
);
563 /* Call callback for every active dquot on given filesystem */
564 int dquot_scan_active(struct super_block
*sb
,
565 int (*fn
)(struct dquot
*dquot
, unsigned long priv
),
568 struct dquot
*dquot
, *old_dquot
= NULL
;
571 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
572 spin_lock(&dq_list_lock
);
573 list_for_each_entry(dquot
, &inuse_list
, dq_inuse
) {
574 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
576 if (dquot
->dq_sb
!= sb
)
578 /* Now we have active dquot so we can just increase use count */
579 atomic_inc(&dquot
->dq_count
);
580 spin_unlock(&dq_list_lock
);
581 dqstats_inc(DQST_LOOKUPS
);
584 ret
= fn(dquot
, priv
);
587 spin_lock(&dq_list_lock
);
588 /* We are safe to continue now because our dquot could not
589 * be moved out of the inuse list while we hold the reference */
591 spin_unlock(&dq_list_lock
);
594 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
597 EXPORT_SYMBOL(dquot_scan_active
);
599 /* Write all dquot structures to quota files */
600 int dquot_writeback_dquots(struct super_block
*sb
, int type
)
602 struct list_head
*dirty
;
604 struct quota_info
*dqopt
= sb_dqopt(sb
);
608 mutex_lock(&dqopt
->dqonoff_mutex
);
609 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
610 if (type
!= -1 && cnt
!= type
)
612 if (!sb_has_quota_active(sb
, cnt
))
614 spin_lock(&dq_list_lock
);
615 dirty
= &dqopt
->info
[cnt
].dqi_dirty_list
;
616 while (!list_empty(dirty
)) {
617 dquot
= list_first_entry(dirty
, struct dquot
,
619 /* Dirty and inactive can be only bad dquot... */
620 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
621 clear_dquot_dirty(dquot
);
624 /* Now we have active dquot from which someone is
625 * holding reference so we can safely just increase
627 atomic_inc(&dquot
->dq_count
);
628 spin_unlock(&dq_list_lock
);
629 dqstats_inc(DQST_LOOKUPS
);
630 err
= 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
);
648 EXPORT_SYMBOL(dquot_writeback_dquots
);
650 /* Write all dquot structures to disk and make them visible from userspace */
651 int dquot_quota_sync(struct super_block
*sb
, int type
)
653 struct quota_info
*dqopt
= sb_dqopt(sb
);
657 ret
= dquot_writeback_dquots(sb
, type
);
660 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
663 /* This is not very clever (and fast) but currently I don't know about
664 * any other simple way of getting quota data to disk and we must get
665 * them there for userspace to be visible... */
666 if (sb
->s_op
->sync_fs
)
667 sb
->s_op
->sync_fs(sb
, 1);
668 sync_blockdev(sb
->s_bdev
);
671 * Now when everything is written we can discard the pagecache so
672 * that userspace sees the changes.
674 mutex_lock(&dqopt
->dqonoff_mutex
);
675 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
676 if (type
!= -1 && cnt
!= type
)
678 if (!sb_has_quota_active(sb
, cnt
))
680 mutex_lock(&dqopt
->files
[cnt
]->i_mutex
);
681 truncate_inode_pages(&dqopt
->files
[cnt
]->i_data
, 0);
682 mutex_unlock(&dqopt
->files
[cnt
]->i_mutex
);
684 mutex_unlock(&dqopt
->dqonoff_mutex
);
688 EXPORT_SYMBOL(dquot_quota_sync
);
690 /* Free unused dquots from cache */
691 static void prune_dqcache(int count
)
693 struct list_head
*head
;
696 head
= free_dquots
.prev
;
697 while (head
!= &free_dquots
&& count
) {
698 dquot
= list_entry(head
, struct dquot
, dq_free
);
699 remove_dquot_hash(dquot
);
700 remove_free_dquot(dquot
);
702 do_destroy_dquot(dquot
);
704 head
= free_dquots
.prev
;
709 * This is called from kswapd when we think we need some
712 static int shrink_dqcache_memory(struct shrinker
*shrink
,
713 struct shrink_control
*sc
)
715 int nr
= sc
->nr_to_scan
;
718 spin_lock(&dq_list_lock
);
720 spin_unlock(&dq_list_lock
);
723 percpu_counter_read_positive(&dqstats
.counter
[DQST_FREE_DQUOTS
])
724 /100) * sysctl_vfs_cache_pressure
;
727 static struct shrinker dqcache_shrinker
= {
728 .shrink
= shrink_dqcache_memory
,
729 .seeks
= DEFAULT_SEEKS
,
733 * Put reference to dquot
734 * NOTE: If you change this function please check whether dqput_blocks() works right...
736 void dqput(struct dquot
*dquot
)
742 #ifdef CONFIG_QUOTA_DEBUG
743 if (!atomic_read(&dquot
->dq_count
)) {
744 quota_error(dquot
->dq_sb
, "trying to free free dquot of %s %d",
745 quotatypes
[dquot
->dq_id
.type
],
746 from_kqid(&init_user_ns
, dquot
->dq_id
));
750 dqstats_inc(DQST_DROPS
);
752 spin_lock(&dq_list_lock
);
753 if (atomic_read(&dquot
->dq_count
) > 1) {
754 /* We have more than one user... nothing to do */
755 atomic_dec(&dquot
->dq_count
);
756 /* Releasing dquot during quotaoff phase? */
757 if (!sb_has_quota_active(dquot
->dq_sb
, dquot
->dq_id
.type
) &&
758 atomic_read(&dquot
->dq_count
) == 1)
759 wake_up(&dquot
->dq_wait_unused
);
760 spin_unlock(&dq_list_lock
);
763 /* Need to release dquot? */
764 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && dquot_dirty(dquot
)) {
765 spin_unlock(&dq_list_lock
);
766 /* Commit dquot before releasing */
767 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
769 quota_error(dquot
->dq_sb
, "Can't write quota structure"
770 " (error %d). Quota may get out of sync!",
773 * We clear dirty bit anyway, so that we avoid
776 spin_lock(&dq_list_lock
);
777 clear_dquot_dirty(dquot
);
778 spin_unlock(&dq_list_lock
);
782 /* Clear flag in case dquot was inactive (something bad happened) */
783 clear_dquot_dirty(dquot
);
784 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
785 spin_unlock(&dq_list_lock
);
786 dquot
->dq_sb
->dq_op
->release_dquot(dquot
);
789 atomic_dec(&dquot
->dq_count
);
790 #ifdef CONFIG_QUOTA_DEBUG
792 BUG_ON(!list_empty(&dquot
->dq_free
));
794 put_dquot_last(dquot
);
795 spin_unlock(&dq_list_lock
);
797 EXPORT_SYMBOL(dqput
);
799 struct dquot
*dquot_alloc(struct super_block
*sb
, int type
)
801 return kmem_cache_zalloc(dquot_cachep
, GFP_NOFS
);
803 EXPORT_SYMBOL(dquot_alloc
);
805 static struct dquot
*get_empty_dquot(struct super_block
*sb
, int type
)
809 dquot
= sb
->dq_op
->alloc_dquot(sb
, type
);
813 mutex_init(&dquot
->dq_lock
);
814 INIT_LIST_HEAD(&dquot
->dq_free
);
815 INIT_LIST_HEAD(&dquot
->dq_inuse
);
816 INIT_HLIST_NODE(&dquot
->dq_hash
);
817 INIT_LIST_HEAD(&dquot
->dq_dirty
);
818 init_waitqueue_head(&dquot
->dq_wait_unused
);
820 dquot
->dq_id
= make_kqid_invalid(type
);
821 atomic_set(&dquot
->dq_count
, 1);
827 * Get reference to dquot
829 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
830 * destroying our dquot by:
831 * a) checking for quota flags under dq_list_lock and
832 * b) getting a reference to dquot before we release dq_list_lock
834 struct dquot
*dqget(struct super_block
*sb
, struct kqid qid
)
836 unsigned int hashent
= hashfn(sb
, qid
);
837 struct dquot
*dquot
= NULL
, *empty
= NULL
;
839 if (!sb_has_quota_active(sb
, qid
.type
))
842 spin_lock(&dq_list_lock
);
843 spin_lock(&dq_state_lock
);
844 if (!sb_has_quota_active(sb
, qid
.type
)) {
845 spin_unlock(&dq_state_lock
);
846 spin_unlock(&dq_list_lock
);
849 spin_unlock(&dq_state_lock
);
851 dquot
= find_dquot(hashent
, sb
, qid
);
854 spin_unlock(&dq_list_lock
);
855 empty
= get_empty_dquot(sb
, qid
.type
);
857 schedule(); /* Try to wait for a moment... */
863 /* all dquots go on the inuse_list */
865 /* hash it first so it can be found */
866 insert_dquot_hash(dquot
);
867 spin_unlock(&dq_list_lock
);
868 dqstats_inc(DQST_LOOKUPS
);
870 if (!atomic_read(&dquot
->dq_count
))
871 remove_free_dquot(dquot
);
872 atomic_inc(&dquot
->dq_count
);
873 spin_unlock(&dq_list_lock
);
874 dqstats_inc(DQST_CACHE_HITS
);
875 dqstats_inc(DQST_LOOKUPS
);
877 /* Wait for dq_lock - after this we know that either dquot_release() is
878 * already finished or it will be canceled due to dq_count > 1 test */
879 wait_on_dquot(dquot
);
880 /* Read the dquot / allocate space in quota file */
881 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) &&
882 sb
->dq_op
->acquire_dquot(dquot
) < 0) {
887 #ifdef CONFIG_QUOTA_DEBUG
888 BUG_ON(!dquot
->dq_sb
); /* Has somebody invalidated entry under us? */
892 do_destroy_dquot(empty
);
896 EXPORT_SYMBOL(dqget
);
898 static int dqinit_needed(struct inode
*inode
, int type
)
902 if (IS_NOQUOTA(inode
))
905 return !inode
->i_dquot
[type
];
906 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
907 if (!inode
->i_dquot
[cnt
])
912 /* This routine is guarded by dqonoff_mutex mutex */
913 static void add_dquot_ref(struct super_block
*sb
, int type
)
915 struct inode
*inode
, *old_inode
= NULL
;
916 #ifdef CONFIG_QUOTA_DEBUG
920 spin_lock(&inode_sb_list_lock
);
921 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
922 spin_lock(&inode
->i_lock
);
923 if ((inode
->i_state
& (I_FREEING
|I_WILL_FREE
|I_NEW
)) ||
924 !atomic_read(&inode
->i_writecount
) ||
925 !dqinit_needed(inode
, type
)) {
926 spin_unlock(&inode
->i_lock
);
930 spin_unlock(&inode
->i_lock
);
931 spin_unlock(&inode_sb_list_lock
);
933 #ifdef CONFIG_QUOTA_DEBUG
934 if (unlikely(inode_get_rsv_space(inode
) > 0))
938 __dquot_initialize(inode
, type
);
941 * We hold a reference to 'inode' so it couldn't have been
942 * removed from s_inodes list while we dropped the
943 * inode_sb_list_lock We cannot iput the inode now as we can be
944 * holding the last reference and we cannot iput it under
945 * inode_sb_list_lock. So we keep the reference and iput it
949 spin_lock(&inode_sb_list_lock
);
951 spin_unlock(&inode_sb_list_lock
);
954 #ifdef CONFIG_QUOTA_DEBUG
956 quota_error(sb
, "Writes happened before quota was turned on "
957 "thus quota information is probably inconsistent. "
958 "Please run quotacheck(8)");
964 * Return 0 if dqput() won't block.
965 * (note that 1 doesn't necessarily mean blocking)
967 static inline int dqput_blocks(struct dquot
*dquot
)
969 if (atomic_read(&dquot
->dq_count
) <= 1)
975 * Remove references to dquots from inode and add dquot to list for freeing
976 * if we have the last reference to dquot
977 * We can't race with anybody because we hold dqptr_sem for writing...
979 static int remove_inode_dquot_ref(struct inode
*inode
, int type
,
980 struct list_head
*tofree_head
)
982 struct dquot
*dquot
= inode
->i_dquot
[type
];
984 inode
->i_dquot
[type
] = NULL
;
986 if (dqput_blocks(dquot
)) {
987 #ifdef CONFIG_QUOTA_DEBUG
988 if (atomic_read(&dquot
->dq_count
) != 1)
989 quota_error(inode
->i_sb
, "Adding dquot with "
990 "dq_count %d to dispose list",
991 atomic_read(&dquot
->dq_count
));
993 spin_lock(&dq_list_lock
);
994 /* As dquot must have currently users it can't be on
995 * the free list... */
996 list_add(&dquot
->dq_free
, tofree_head
);
997 spin_unlock(&dq_list_lock
);
1001 dqput(dquot
); /* We have guaranteed we won't block */
1007 * Free list of dquots
1008 * Dquots are removed from inodes and no new references can be got so we are
1009 * the only ones holding reference
1011 static void put_dquot_list(struct list_head
*tofree_head
)
1013 struct list_head
*act_head
;
1014 struct dquot
*dquot
;
1016 act_head
= tofree_head
->next
;
1017 while (act_head
!= tofree_head
) {
1018 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
1019 act_head
= act_head
->next
;
1020 /* Remove dquot from the list so we won't have problems... */
1021 list_del_init(&dquot
->dq_free
);
1026 static void remove_dquot_ref(struct super_block
*sb
, int type
,
1027 struct list_head
*tofree_head
)
1029 struct inode
*inode
;
1032 spin_lock(&inode_sb_list_lock
);
1033 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
1035 * We have to scan also I_NEW inodes because they can already
1036 * have quota pointer initialized. Luckily, we need to touch
1037 * only quota pointers and these have separate locking
1040 if (!IS_NOQUOTA(inode
)) {
1041 if (unlikely(inode_get_rsv_space(inode
) > 0))
1043 remove_inode_dquot_ref(inode
, type
, tofree_head
);
1046 spin_unlock(&inode_sb_list_lock
);
1047 #ifdef CONFIG_QUOTA_DEBUG
1049 printk(KERN_WARNING
"VFS (%s): Writes happened after quota"
1050 " was disabled thus quota information is probably "
1051 "inconsistent. Please run quotacheck(8).\n", sb
->s_id
);
1056 /* Gather all references from inodes and drop them */
1057 static void drop_dquot_ref(struct super_block
*sb
, int type
)
1059 LIST_HEAD(tofree_head
);
1062 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1063 remove_dquot_ref(sb
, type
, &tofree_head
);
1064 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1065 put_dquot_list(&tofree_head
);
1069 static inline void dquot_incr_inodes(struct dquot
*dquot
, qsize_t number
)
1071 dquot
->dq_dqb
.dqb_curinodes
+= number
;
1074 static inline void dquot_incr_space(struct dquot
*dquot
, qsize_t number
)
1076 dquot
->dq_dqb
.dqb_curspace
+= number
;
1079 static inline void dquot_resv_space(struct dquot
*dquot
, qsize_t number
)
1081 dquot
->dq_dqb
.dqb_rsvspace
+= number
;
1085 * Claim reserved quota space
1087 static void dquot_claim_reserved_space(struct dquot
*dquot
, qsize_t number
)
1089 if (dquot
->dq_dqb
.dqb_rsvspace
< number
) {
1091 number
= dquot
->dq_dqb
.dqb_rsvspace
;
1093 dquot
->dq_dqb
.dqb_curspace
+= number
;
1094 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1098 void dquot_free_reserved_space(struct dquot
*dquot
, qsize_t number
)
1100 if (dquot
->dq_dqb
.dqb_rsvspace
>= number
)
1101 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1104 dquot
->dq_dqb
.dqb_rsvspace
= 0;
1108 static void dquot_decr_inodes(struct dquot
*dquot
, qsize_t number
)
1110 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1111 dquot
->dq_dqb
.dqb_curinodes
>= number
)
1112 dquot
->dq_dqb
.dqb_curinodes
-= number
;
1114 dquot
->dq_dqb
.dqb_curinodes
= 0;
1115 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1116 dquot
->dq_dqb
.dqb_itime
= (time_t) 0;
1117 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
1120 static void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
1122 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1123 dquot
->dq_dqb
.dqb_curspace
>= number
)
1124 dquot
->dq_dqb
.dqb_curspace
-= number
;
1126 dquot
->dq_dqb
.dqb_curspace
= 0;
1127 if (dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1128 dquot
->dq_dqb
.dqb_btime
= (time_t) 0;
1129 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1133 struct super_block
*w_sb
;
1134 struct kqid w_dq_id
;
1138 static int warning_issued(struct dquot
*dquot
, const int warntype
)
1140 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
1141 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
1142 ((warntype
== QUOTA_NL_IHARDWARN
||
1143 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
1147 return test_and_set_bit(flag
, &dquot
->dq_flags
);
1150 #ifdef CONFIG_PRINT_QUOTA_WARNING
1151 static int flag_print_warnings
= 1;
1153 static int need_print_warning(struct dquot_warn
*warn
)
1155 if (!flag_print_warnings
)
1158 switch (warn
->w_dq_id
.type
) {
1160 return uid_eq(current_fsuid(), warn
->w_dq_id
.uid
);
1162 return in_group_p(warn
->w_dq_id
.gid
);
1163 case PRJQUOTA
: /* Never taken... Just make gcc happy */
1169 /* Print warning to user which exceeded quota */
1170 static void print_warning(struct dquot_warn
*warn
)
1173 struct tty_struct
*tty
;
1174 int warntype
= warn
->w_type
;
1176 if (warntype
== QUOTA_NL_IHARDBELOW
||
1177 warntype
== QUOTA_NL_ISOFTBELOW
||
1178 warntype
== QUOTA_NL_BHARDBELOW
||
1179 warntype
== QUOTA_NL_BSOFTBELOW
|| !need_print_warning(warn
))
1182 tty
= get_current_tty();
1185 tty_write_message(tty
, warn
->w_sb
->s_id
);
1186 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
1187 tty_write_message(tty
, ": warning, ");
1189 tty_write_message(tty
, ": write failed, ");
1190 tty_write_message(tty
, quotatypes
[warn
->w_dq_id
.type
]);
1192 case QUOTA_NL_IHARDWARN
:
1193 msg
= " file limit reached.\r\n";
1195 case QUOTA_NL_ISOFTLONGWARN
:
1196 msg
= " file quota exceeded too long.\r\n";
1198 case QUOTA_NL_ISOFTWARN
:
1199 msg
= " file quota exceeded.\r\n";
1201 case QUOTA_NL_BHARDWARN
:
1202 msg
= " block limit reached.\r\n";
1204 case QUOTA_NL_BSOFTLONGWARN
:
1205 msg
= " block quota exceeded too long.\r\n";
1207 case QUOTA_NL_BSOFTWARN
:
1208 msg
= " block quota exceeded.\r\n";
1211 tty_write_message(tty
, msg
);
1216 static void prepare_warning(struct dquot_warn
*warn
, struct dquot
*dquot
,
1219 if (warning_issued(dquot
, warntype
))
1221 warn
->w_type
= warntype
;
1222 warn
->w_sb
= dquot
->dq_sb
;
1223 warn
->w_dq_id
= dquot
->dq_id
;
1227 * Write warnings to the console and send warning messages over netlink.
1229 * Note that this function can call into tty and networking code.
1231 static void flush_warnings(struct dquot_warn
*warn
)
1235 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1236 if (warn
[i
].w_type
== QUOTA_NL_NOWARN
)
1238 #ifdef CONFIG_PRINT_QUOTA_WARNING
1239 print_warning(&warn
[i
]);
1241 quota_send_warning(warn
[i
].w_dq_id
,
1242 warn
[i
].w_sb
->s_dev
, warn
[i
].w_type
);
1246 static int ignore_hardlimit(struct dquot
*dquot
)
1248 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
];
1250 return capable(CAP_SYS_RESOURCE
) &&
1251 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
||
1252 !(info
->dqi_flags
& V1_DQF_RSQUASH
));
1255 /* needs dq_data_lock */
1256 static int check_idq(struct dquot
*dquot
, qsize_t inodes
,
1257 struct dquot_warn
*warn
)
1259 qsize_t newinodes
= dquot
->dq_dqb
.dqb_curinodes
+ inodes
;
1261 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_id
.type
) ||
1262 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1265 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1266 newinodes
> dquot
->dq_dqb
.dqb_ihardlimit
&&
1267 !ignore_hardlimit(dquot
)) {
1268 prepare_warning(warn
, dquot
, QUOTA_NL_IHARDWARN
);
1272 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1273 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1274 dquot
->dq_dqb
.dqb_itime
&&
1275 get_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1276 !ignore_hardlimit(dquot
)) {
1277 prepare_warning(warn
, dquot
, QUOTA_NL_ISOFTLONGWARN
);
1281 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1282 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1283 dquot
->dq_dqb
.dqb_itime
== 0) {
1284 prepare_warning(warn
, dquot
, QUOTA_NL_ISOFTWARN
);
1285 dquot
->dq_dqb
.dqb_itime
= get_seconds() +
1286 sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
].dqi_igrace
;
1292 /* needs dq_data_lock */
1293 static int check_bdq(struct dquot
*dquot
, qsize_t space
, int prealloc
,
1294 struct dquot_warn
*warn
)
1297 struct super_block
*sb
= dquot
->dq_sb
;
1299 if (!sb_has_quota_limits_enabled(sb
, dquot
->dq_id
.type
) ||
1300 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1303 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
1306 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1307 tspace
> dquot
->dq_dqb
.dqb_bhardlimit
&&
1308 !ignore_hardlimit(dquot
)) {
1310 prepare_warning(warn
, dquot
, QUOTA_NL_BHARDWARN
);
1314 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1315 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1316 dquot
->dq_dqb
.dqb_btime
&&
1317 get_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1318 !ignore_hardlimit(dquot
)) {
1320 prepare_warning(warn
, dquot
, QUOTA_NL_BSOFTLONGWARN
);
1324 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1325 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1326 dquot
->dq_dqb
.dqb_btime
== 0) {
1328 prepare_warning(warn
, dquot
, QUOTA_NL_BSOFTWARN
);
1329 dquot
->dq_dqb
.dqb_btime
= get_seconds() +
1330 sb_dqopt(sb
)->info
[dquot
->dq_id
.type
].dqi_bgrace
;
1334 * We don't allow preallocation to exceed softlimit so exceeding will
1343 static int info_idq_free(struct dquot
*dquot
, qsize_t inodes
)
1347 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1348 dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
||
1349 !sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_id
.type
))
1350 return QUOTA_NL_NOWARN
;
1352 newinodes
= dquot
->dq_dqb
.dqb_curinodes
- inodes
;
1353 if (newinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1354 return QUOTA_NL_ISOFTBELOW
;
1355 if (dquot
->dq_dqb
.dqb_curinodes
>= dquot
->dq_dqb
.dqb_ihardlimit
&&
1356 newinodes
< dquot
->dq_dqb
.dqb_ihardlimit
)
1357 return QUOTA_NL_IHARDBELOW
;
1358 return QUOTA_NL_NOWARN
;
1361 static int info_bdq_free(struct dquot
*dquot
, qsize_t space
)
1363 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1364 dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1365 return QUOTA_NL_NOWARN
;
1367 if (dquot
->dq_dqb
.dqb_curspace
- space
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1368 return QUOTA_NL_BSOFTBELOW
;
1369 if (dquot
->dq_dqb
.dqb_curspace
>= dquot
->dq_dqb
.dqb_bhardlimit
&&
1370 dquot
->dq_dqb
.dqb_curspace
- space
< dquot
->dq_dqb
.dqb_bhardlimit
)
1371 return QUOTA_NL_BHARDBELOW
;
1372 return QUOTA_NL_NOWARN
;
1375 static int dquot_active(const struct inode
*inode
)
1377 struct super_block
*sb
= inode
->i_sb
;
1379 if (IS_NOQUOTA(inode
))
1381 return sb_any_quota_loaded(sb
) & ~sb_any_quota_suspended(sb
);
1385 * Initialize quota pointers in inode
1387 * We do things in a bit complicated way but by that we avoid calling
1388 * dqget() and thus filesystem callbacks under dqptr_sem.
1390 * It is better to call this function outside of any transaction as it
1391 * might need a lot of space in journal for dquot structure allocation.
1393 static void __dquot_initialize(struct inode
*inode
, int type
)
1396 struct dquot
*got
[MAXQUOTAS
];
1397 struct super_block
*sb
= inode
->i_sb
;
1400 /* First test before acquiring mutex - solves deadlocks when we
1401 * re-enter the quota code and are already holding the mutex */
1402 if (!dquot_active(inode
))
1405 /* First get references to structures we might need. */
1406 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1409 if (type
!= -1 && cnt
!= type
)
1413 qid
= make_kqid_uid(inode
->i_uid
);
1416 qid
= make_kqid_gid(inode
->i_gid
);
1419 got
[cnt
] = dqget(sb
, qid
);
1422 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1423 if (IS_NOQUOTA(inode
))
1425 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1426 if (type
!= -1 && cnt
!= type
)
1428 /* Avoid races with quotaoff() */
1429 if (!sb_has_quota_active(sb
, cnt
))
1431 /* We could race with quotaon or dqget() could have failed */
1434 if (!inode
->i_dquot
[cnt
]) {
1435 inode
->i_dquot
[cnt
] = got
[cnt
];
1438 * Make quota reservation system happy if someone
1439 * did a write before quota was turned on
1441 rsv
= inode_get_rsv_space(inode
);
1443 dquot_resv_space(inode
->i_dquot
[cnt
], rsv
);
1447 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1448 /* Drop unused references */
1452 void dquot_initialize(struct inode
*inode
)
1454 __dquot_initialize(inode
, -1);
1456 EXPORT_SYMBOL(dquot_initialize
);
1459 * Release all quotas referenced by inode
1461 static void __dquot_drop(struct inode
*inode
)
1464 struct dquot
*put
[MAXQUOTAS
];
1466 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1467 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1468 put
[cnt
] = inode
->i_dquot
[cnt
];
1469 inode
->i_dquot
[cnt
] = NULL
;
1471 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1475 void dquot_drop(struct inode
*inode
)
1479 if (IS_NOQUOTA(inode
))
1483 * Test before calling to rule out calls from proc and such
1484 * where we are not allowed to block. Note that this is
1485 * actually reliable test even without the lock - the caller
1486 * must assure that nobody can come after the DQUOT_DROP and
1487 * add quota pointers back anyway.
1489 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1490 if (inode
->i_dquot
[cnt
])
1494 if (cnt
< MAXQUOTAS
)
1495 __dquot_drop(inode
);
1497 EXPORT_SYMBOL(dquot_drop
);
1500 * inode_reserved_space is managed internally by quota, and protected by
1501 * i_lock similar to i_blocks+i_bytes.
1503 static qsize_t
*inode_reserved_space(struct inode
* inode
)
1505 /* Filesystem must explicitly define it's own method in order to use
1506 * quota reservation interface */
1507 BUG_ON(!inode
->i_sb
->dq_op
->get_reserved_space
);
1508 return inode
->i_sb
->dq_op
->get_reserved_space(inode
);
1511 void inode_add_rsv_space(struct inode
*inode
, qsize_t number
)
1513 spin_lock(&inode
->i_lock
);
1514 *inode_reserved_space(inode
) += number
;
1515 spin_unlock(&inode
->i_lock
);
1517 EXPORT_SYMBOL(inode_add_rsv_space
);
1519 void inode_claim_rsv_space(struct inode
*inode
, qsize_t number
)
1521 spin_lock(&inode
->i_lock
);
1522 *inode_reserved_space(inode
) -= number
;
1523 __inode_add_bytes(inode
, number
);
1524 spin_unlock(&inode
->i_lock
);
1526 EXPORT_SYMBOL(inode_claim_rsv_space
);
1528 void inode_sub_rsv_space(struct inode
*inode
, qsize_t number
)
1530 spin_lock(&inode
->i_lock
);
1531 *inode_reserved_space(inode
) -= number
;
1532 spin_unlock(&inode
->i_lock
);
1534 EXPORT_SYMBOL(inode_sub_rsv_space
);
1536 static qsize_t
inode_get_rsv_space(struct inode
*inode
)
1540 if (!inode
->i_sb
->dq_op
->get_reserved_space
)
1542 spin_lock(&inode
->i_lock
);
1543 ret
= *inode_reserved_space(inode
);
1544 spin_unlock(&inode
->i_lock
);
1548 static void inode_incr_space(struct inode
*inode
, qsize_t number
,
1552 inode_add_rsv_space(inode
, number
);
1554 inode_add_bytes(inode
, number
);
1557 static void inode_decr_space(struct inode
*inode
, qsize_t number
, int reserve
)
1560 inode_sub_rsv_space(inode
, number
);
1562 inode_sub_bytes(inode
, number
);
1566 * This functions updates i_blocks+i_bytes fields and quota information
1567 * (together with appropriate checks).
1569 * NOTE: We absolutely rely on the fact that caller dirties the inode
1570 * (usually helpers in quotaops.h care about this) and holds a handle for
1571 * the current transaction so that dquot write and inode write go into the
1576 * This operation can block, but only after everything is updated
1578 int __dquot_alloc_space(struct inode
*inode
, qsize_t number
, int flags
)
1581 struct dquot_warn warn
[MAXQUOTAS
];
1582 struct dquot
**dquots
= inode
->i_dquot
;
1583 int reserve
= flags
& DQUOT_SPACE_RESERVE
;
1586 * First test before acquiring mutex - solves deadlocks when we
1587 * re-enter the quota code and are already holding the mutex
1589 if (!dquot_active(inode
)) {
1590 inode_incr_space(inode
, number
, reserve
);
1594 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1595 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1597 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1598 spin_lock(&dq_data_lock
);
1599 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1602 ret
= check_bdq(dquots
[cnt
], number
,
1603 !(flags
& DQUOT_SPACE_WARN
), &warn
[cnt
]);
1604 if (ret
&& !(flags
& DQUOT_SPACE_NOFAIL
)) {
1605 spin_unlock(&dq_data_lock
);
1606 goto out_flush_warn
;
1609 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1613 dquot_resv_space(dquots
[cnt
], number
);
1615 dquot_incr_space(dquots
[cnt
], number
);
1617 inode_incr_space(inode
, number
, reserve
);
1618 spin_unlock(&dq_data_lock
);
1621 goto out_flush_warn
;
1622 mark_all_dquot_dirty(dquots
);
1624 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1625 flush_warnings(warn
);
1629 EXPORT_SYMBOL(__dquot_alloc_space
);
1632 * This operation can block, but only after everything is updated
1634 int dquot_alloc_inode(const struct inode
*inode
)
1637 struct dquot_warn warn
[MAXQUOTAS
];
1638 struct dquot
* const *dquots
= inode
->i_dquot
;
1640 /* First test before acquiring mutex - solves deadlocks when we
1641 * re-enter the quota code and are already holding the mutex */
1642 if (!dquot_active(inode
))
1644 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1645 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1646 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1647 spin_lock(&dq_data_lock
);
1648 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1651 ret
= check_idq(dquots
[cnt
], 1, &warn
[cnt
]);
1656 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1659 dquot_incr_inodes(dquots
[cnt
], 1);
1663 spin_unlock(&dq_data_lock
);
1665 mark_all_dquot_dirty(dquots
);
1666 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1667 flush_warnings(warn
);
1670 EXPORT_SYMBOL(dquot_alloc_inode
);
1673 * Convert in-memory reserved quotas to real consumed quotas
1675 int dquot_claim_space_nodirty(struct inode
*inode
, qsize_t number
)
1679 if (!dquot_active(inode
)) {
1680 inode_claim_rsv_space(inode
, number
);
1684 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1685 spin_lock(&dq_data_lock
);
1686 /* Claim reserved quotas to allocated quotas */
1687 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1688 if (inode
->i_dquot
[cnt
])
1689 dquot_claim_reserved_space(inode
->i_dquot
[cnt
],
1692 /* Update inode bytes */
1693 inode_claim_rsv_space(inode
, number
);
1694 spin_unlock(&dq_data_lock
);
1695 mark_all_dquot_dirty(inode
->i_dquot
);
1696 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1699 EXPORT_SYMBOL(dquot_claim_space_nodirty
);
1702 * This operation can block, but only after everything is updated
1704 void __dquot_free_space(struct inode
*inode
, qsize_t number
, int flags
)
1707 struct dquot_warn warn
[MAXQUOTAS
];
1708 struct dquot
**dquots
= inode
->i_dquot
;
1709 int reserve
= flags
& DQUOT_SPACE_RESERVE
;
1711 /* First test before acquiring mutex - solves deadlocks when we
1712 * re-enter the quota code and are already holding the mutex */
1713 if (!dquot_active(inode
)) {
1714 inode_decr_space(inode
, number
, reserve
);
1718 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1719 spin_lock(&dq_data_lock
);
1720 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1723 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1726 wtype
= info_bdq_free(dquots
[cnt
], number
);
1727 if (wtype
!= QUOTA_NL_NOWARN
)
1728 prepare_warning(&warn
[cnt
], dquots
[cnt
], wtype
);
1730 dquot_free_reserved_space(dquots
[cnt
], number
);
1732 dquot_decr_space(dquots
[cnt
], number
);
1734 inode_decr_space(inode
, number
, reserve
);
1735 spin_unlock(&dq_data_lock
);
1739 mark_all_dquot_dirty(dquots
);
1741 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1742 flush_warnings(warn
);
1744 EXPORT_SYMBOL(__dquot_free_space
);
1747 * This operation can block, but only after everything is updated
1749 void dquot_free_inode(const struct inode
*inode
)
1752 struct dquot_warn warn
[MAXQUOTAS
];
1753 struct dquot
* const *dquots
= inode
->i_dquot
;
1755 /* First test before acquiring mutex - solves deadlocks when we
1756 * re-enter the quota code and are already holding the mutex */
1757 if (!dquot_active(inode
))
1760 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1761 spin_lock(&dq_data_lock
);
1762 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1765 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1768 wtype
= info_idq_free(dquots
[cnt
], 1);
1769 if (wtype
!= QUOTA_NL_NOWARN
)
1770 prepare_warning(&warn
[cnt
], dquots
[cnt
], wtype
);
1771 dquot_decr_inodes(dquots
[cnt
], 1);
1773 spin_unlock(&dq_data_lock
);
1774 mark_all_dquot_dirty(dquots
);
1775 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1776 flush_warnings(warn
);
1778 EXPORT_SYMBOL(dquot_free_inode
);
1781 * Transfer the number of inode and blocks from one diskquota to an other.
1782 * On success, dquot references in transfer_to are consumed and references
1783 * to original dquots that need to be released are placed there. On failure,
1784 * references are kept untouched.
1786 * This operation can block, but only after everything is updated
1787 * A transaction must be started when entering this function.
1790 int __dquot_transfer(struct inode
*inode
, struct dquot
**transfer_to
)
1792 qsize_t space
, cur_space
;
1793 qsize_t rsv_space
= 0;
1794 struct dquot
*transfer_from
[MAXQUOTAS
] = {};
1796 char is_valid
[MAXQUOTAS
] = {};
1797 struct dquot_warn warn_to
[MAXQUOTAS
];
1798 struct dquot_warn warn_from_inodes
[MAXQUOTAS
];
1799 struct dquot_warn warn_from_space
[MAXQUOTAS
];
1801 /* First test before acquiring mutex - solves deadlocks when we
1802 * re-enter the quota code and are already holding the mutex */
1803 if (IS_NOQUOTA(inode
))
1805 /* Initialize the arrays */
1806 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1807 warn_to
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1808 warn_from_inodes
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1809 warn_from_space
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1811 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1812 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1813 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1816 spin_lock(&dq_data_lock
);
1817 cur_space
= inode_get_bytes(inode
);
1818 rsv_space
= inode_get_rsv_space(inode
);
1819 space
= cur_space
+ rsv_space
;
1820 /* Build the transfer_from list and check the limits */
1821 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1823 * Skip changes for same uid or gid or for turned off quota-type.
1825 if (!transfer_to
[cnt
])
1827 /* Avoid races with quotaoff() */
1828 if (!sb_has_quota_active(inode
->i_sb
, cnt
))
1831 transfer_from
[cnt
] = inode
->i_dquot
[cnt
];
1832 ret
= check_idq(transfer_to
[cnt
], 1, &warn_to
[cnt
]);
1835 ret
= check_bdq(transfer_to
[cnt
], space
, 0, &warn_to
[cnt
]);
1841 * Finally perform the needed transfer from transfer_from to transfer_to
1843 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1846 /* Due to IO error we might not have transfer_from[] structure */
1847 if (transfer_from
[cnt
]) {
1849 wtype
= info_idq_free(transfer_from
[cnt
], 1);
1850 if (wtype
!= QUOTA_NL_NOWARN
)
1851 prepare_warning(&warn_from_inodes
[cnt
],
1852 transfer_from
[cnt
], wtype
);
1853 wtype
= info_bdq_free(transfer_from
[cnt
], space
);
1854 if (wtype
!= QUOTA_NL_NOWARN
)
1855 prepare_warning(&warn_from_space
[cnt
],
1856 transfer_from
[cnt
], wtype
);
1857 dquot_decr_inodes(transfer_from
[cnt
], 1);
1858 dquot_decr_space(transfer_from
[cnt
], cur_space
);
1859 dquot_free_reserved_space(transfer_from
[cnt
],
1863 dquot_incr_inodes(transfer_to
[cnt
], 1);
1864 dquot_incr_space(transfer_to
[cnt
], cur_space
);
1865 dquot_resv_space(transfer_to
[cnt
], rsv_space
);
1867 inode
->i_dquot
[cnt
] = transfer_to
[cnt
];
1869 spin_unlock(&dq_data_lock
);
1870 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1872 mark_all_dquot_dirty(transfer_from
);
1873 mark_all_dquot_dirty(transfer_to
);
1874 flush_warnings(warn_to
);
1875 flush_warnings(warn_from_inodes
);
1876 flush_warnings(warn_from_space
);
1877 /* Pass back references to put */
1878 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1880 transfer_to
[cnt
] = transfer_from
[cnt
];
1883 spin_unlock(&dq_data_lock
);
1884 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1885 flush_warnings(warn_to
);
1888 EXPORT_SYMBOL(__dquot_transfer
);
1890 /* Wrapper for transferring ownership of an inode for uid/gid only
1891 * Called from FSXXX_setattr()
1893 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
1895 struct dquot
*transfer_to
[MAXQUOTAS
] = {};
1896 struct super_block
*sb
= inode
->i_sb
;
1899 if (!dquot_active(inode
))
1902 if (iattr
->ia_valid
& ATTR_UID
&& !uid_eq(iattr
->ia_uid
, inode
->i_uid
))
1903 transfer_to
[USRQUOTA
] = dqget(sb
, make_kqid_uid(iattr
->ia_uid
));
1904 if (iattr
->ia_valid
& ATTR_GID
&& !gid_eq(iattr
->ia_gid
, inode
->i_gid
))
1905 transfer_to
[GRPQUOTA
] = dqget(sb
, make_kqid_gid(iattr
->ia_gid
));
1907 ret
= __dquot_transfer(inode
, transfer_to
);
1908 dqput_all(transfer_to
);
1911 EXPORT_SYMBOL(dquot_transfer
);
1914 * Write info of quota file to disk
1916 int dquot_commit_info(struct super_block
*sb
, int type
)
1919 struct quota_info
*dqopt
= sb_dqopt(sb
);
1921 mutex_lock(&dqopt
->dqio_mutex
);
1922 ret
= dqopt
->ops
[type
]->write_file_info(sb
, type
);
1923 mutex_unlock(&dqopt
->dqio_mutex
);
1926 EXPORT_SYMBOL(dquot_commit_info
);
1929 * Definitions of diskquota operations.
1931 const struct dquot_operations dquot_operations
= {
1932 .write_dquot
= dquot_commit
,
1933 .acquire_dquot
= dquot_acquire
,
1934 .release_dquot
= dquot_release
,
1935 .mark_dirty
= dquot_mark_dquot_dirty
,
1936 .write_info
= dquot_commit_info
,
1937 .alloc_dquot
= dquot_alloc
,
1938 .destroy_dquot
= dquot_destroy
,
1940 EXPORT_SYMBOL(dquot_operations
);
1943 * Generic helper for ->open on filesystems supporting disk quotas.
1945 int dquot_file_open(struct inode
*inode
, struct file
*file
)
1949 error
= generic_file_open(inode
, file
);
1950 if (!error
&& (file
->f_mode
& FMODE_WRITE
))
1951 dquot_initialize(inode
);
1954 EXPORT_SYMBOL(dquot_file_open
);
1957 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1959 int dquot_disable(struct super_block
*sb
, int type
, unsigned int flags
)
1962 struct quota_info
*dqopt
= sb_dqopt(sb
);
1963 struct inode
*toputinode
[MAXQUOTAS
];
1965 /* Cannot turn off usage accounting without turning off limits, or
1966 * suspend quotas and simultaneously turn quotas off. */
1967 if ((flags
& DQUOT_USAGE_ENABLED
&& !(flags
& DQUOT_LIMITS_ENABLED
))
1968 || (flags
& DQUOT_SUSPENDED
&& flags
& (DQUOT_LIMITS_ENABLED
|
1969 DQUOT_USAGE_ENABLED
)))
1972 /* We need to serialize quota_off() for device */
1973 mutex_lock(&dqopt
->dqonoff_mutex
);
1976 * Skip everything if there's nothing to do. We have to do this because
1977 * sometimes we are called when fill_super() failed and calling
1978 * sync_fs() in such cases does no good.
1980 if (!sb_any_quota_loaded(sb
)) {
1981 mutex_unlock(&dqopt
->dqonoff_mutex
);
1984 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1985 toputinode
[cnt
] = NULL
;
1986 if (type
!= -1 && cnt
!= type
)
1988 if (!sb_has_quota_loaded(sb
, cnt
))
1991 if (flags
& DQUOT_SUSPENDED
) {
1992 spin_lock(&dq_state_lock
);
1994 dquot_state_flag(DQUOT_SUSPENDED
, cnt
);
1995 spin_unlock(&dq_state_lock
);
1997 spin_lock(&dq_state_lock
);
1998 dqopt
->flags
&= ~dquot_state_flag(flags
, cnt
);
1999 /* Turning off suspended quotas? */
2000 if (!sb_has_quota_loaded(sb
, cnt
) &&
2001 sb_has_quota_suspended(sb
, cnt
)) {
2002 dqopt
->flags
&= ~dquot_state_flag(
2003 DQUOT_SUSPENDED
, cnt
);
2004 spin_unlock(&dq_state_lock
);
2005 iput(dqopt
->files
[cnt
]);
2006 dqopt
->files
[cnt
] = NULL
;
2009 spin_unlock(&dq_state_lock
);
2012 /* We still have to keep quota loaded? */
2013 if (sb_has_quota_loaded(sb
, cnt
) && !(flags
& DQUOT_SUSPENDED
))
2016 /* Note: these are blocking operations */
2017 drop_dquot_ref(sb
, cnt
);
2018 invalidate_dquots(sb
, cnt
);
2020 * Now all dquots should be invalidated, all writes done so we
2021 * should be only users of the info. No locks needed.
2023 if (info_dirty(&dqopt
->info
[cnt
]))
2024 sb
->dq_op
->write_info(sb
, cnt
);
2025 if (dqopt
->ops
[cnt
]->free_file_info
)
2026 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
2027 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
2029 toputinode
[cnt
] = dqopt
->files
[cnt
];
2030 if (!sb_has_quota_loaded(sb
, cnt
))
2031 dqopt
->files
[cnt
] = NULL
;
2032 dqopt
->info
[cnt
].dqi_flags
= 0;
2033 dqopt
->info
[cnt
].dqi_igrace
= 0;
2034 dqopt
->info
[cnt
].dqi_bgrace
= 0;
2035 dqopt
->ops
[cnt
] = NULL
;
2037 mutex_unlock(&dqopt
->dqonoff_mutex
);
2039 /* Skip syncing and setting flags if quota files are hidden */
2040 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
2043 /* Sync the superblock so that buffers with quota data are written to
2044 * disk (and so userspace sees correct data afterwards). */
2045 if (sb
->s_op
->sync_fs
)
2046 sb
->s_op
->sync_fs(sb
, 1);
2047 sync_blockdev(sb
->s_bdev
);
2048 /* Now the quota files are just ordinary files and we can set the
2049 * inode flags back. Moreover we discard the pagecache so that
2050 * userspace sees the writes we did bypassing the pagecache. We
2051 * must also discard the blockdev buffers so that we see the
2052 * changes done by userspace on the next quotaon() */
2053 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2054 if (toputinode
[cnt
]) {
2055 mutex_lock(&dqopt
->dqonoff_mutex
);
2056 /* If quota was reenabled in the meantime, we have
2058 if (!sb_has_quota_loaded(sb
, cnt
)) {
2059 mutex_lock(&toputinode
[cnt
]->i_mutex
);
2060 toputinode
[cnt
]->i_flags
&= ~(S_IMMUTABLE
|
2061 S_NOATIME
| S_NOQUOTA
);
2062 truncate_inode_pages(&toputinode
[cnt
]->i_data
,
2064 mutex_unlock(&toputinode
[cnt
]->i_mutex
);
2065 mark_inode_dirty_sync(toputinode
[cnt
]);
2067 mutex_unlock(&dqopt
->dqonoff_mutex
);
2070 invalidate_bdev(sb
->s_bdev
);
2072 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2073 if (toputinode
[cnt
]) {
2074 /* On remount RO, we keep the inode pointer so that we
2075 * can reenable quota on the subsequent remount RW. We
2076 * have to check 'flags' variable and not use sb_has_
2077 * function because another quotaon / quotaoff could
2078 * change global state before we got here. We refuse
2079 * to suspend quotas when there is pending delete on
2080 * the quota file... */
2081 if (!(flags
& DQUOT_SUSPENDED
))
2082 iput(toputinode
[cnt
]);
2083 else if (!toputinode
[cnt
]->i_nlink
)
2088 EXPORT_SYMBOL(dquot_disable
);
2090 int dquot_quota_off(struct super_block
*sb
, int type
)
2092 return dquot_disable(sb
, type
,
2093 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2095 EXPORT_SYMBOL(dquot_quota_off
);
2098 * Turn quotas on on a device
2102 * Helper function to turn quotas on when we already have the inode of
2103 * quota file and no quota information is loaded.
2105 static int vfs_load_quota_inode(struct inode
*inode
, int type
, int format_id
,
2108 struct quota_format_type
*fmt
= find_quota_format(format_id
);
2109 struct super_block
*sb
= inode
->i_sb
;
2110 struct quota_info
*dqopt
= sb_dqopt(sb
);
2116 if (!S_ISREG(inode
->i_mode
)) {
2120 if (IS_RDONLY(inode
)) {
2124 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
) {
2128 /* Usage always has to be set... */
2129 if (!(flags
& DQUOT_USAGE_ENABLED
)) {
2134 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2135 /* As we bypass the pagecache we must now flush all the
2136 * dirty data and invalidate caches so that kernel sees
2137 * changes from userspace. It is not enough to just flush
2138 * the quota file since if blocksize < pagesize, invalidation
2139 * of the cache could fail because of other unrelated dirty
2141 sync_filesystem(sb
);
2142 invalidate_bdev(sb
->s_bdev
);
2144 mutex_lock(&dqopt
->dqonoff_mutex
);
2145 if (sb_has_quota_loaded(sb
, type
)) {
2150 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2151 /* We don't want quota and atime on quota files (deadlocks
2152 * possible) Also nobody should write to the file - we use
2153 * special IO operations which ignore the immutable bit. */
2154 mutex_lock(&inode
->i_mutex
);
2155 oldflags
= inode
->i_flags
& (S_NOATIME
| S_IMMUTABLE
|
2157 inode
->i_flags
|= S_NOQUOTA
| S_NOATIME
| S_IMMUTABLE
;
2158 mutex_unlock(&inode
->i_mutex
);
2160 * When S_NOQUOTA is set, remove dquot references as no more
2161 * references can be added
2163 __dquot_drop(inode
);
2167 dqopt
->files
[type
] = igrab(inode
);
2168 if (!dqopt
->files
[type
])
2171 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
2174 dqopt
->ops
[type
] = fmt
->qf_ops
;
2175 dqopt
->info
[type
].dqi_format
= fmt
;
2176 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
2177 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
2178 mutex_lock(&dqopt
->dqio_mutex
);
2179 error
= dqopt
->ops
[type
]->read_file_info(sb
, type
);
2181 mutex_unlock(&dqopt
->dqio_mutex
);
2184 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
2185 dqopt
->info
[type
].dqi_flags
|= DQF_SYS_FILE
;
2186 mutex_unlock(&dqopt
->dqio_mutex
);
2187 spin_lock(&dq_state_lock
);
2188 dqopt
->flags
|= dquot_state_flag(flags
, type
);
2189 spin_unlock(&dq_state_lock
);
2191 add_dquot_ref(sb
, type
);
2192 mutex_unlock(&dqopt
->dqonoff_mutex
);
2197 dqopt
->files
[type
] = NULL
;
2200 if (oldflags
!= -1) {
2201 mutex_lock(&inode
->i_mutex
);
2202 /* Set the flags back (in the case of accidental quotaon()
2203 * on a wrong file we don't want to mess up the flags) */
2204 inode
->i_flags
&= ~(S_NOATIME
| S_NOQUOTA
| S_IMMUTABLE
);
2205 inode
->i_flags
|= oldflags
;
2206 mutex_unlock(&inode
->i_mutex
);
2208 mutex_unlock(&dqopt
->dqonoff_mutex
);
2210 put_quota_format(fmt
);
2215 /* Reenable quotas on remount RW */
2216 int dquot_resume(struct super_block
*sb
, int type
)
2218 struct quota_info
*dqopt
= sb_dqopt(sb
);
2219 struct inode
*inode
;
2223 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2224 if (type
!= -1 && cnt
!= type
)
2227 mutex_lock(&dqopt
->dqonoff_mutex
);
2228 if (!sb_has_quota_suspended(sb
, cnt
)) {
2229 mutex_unlock(&dqopt
->dqonoff_mutex
);
2232 inode
= dqopt
->files
[cnt
];
2233 dqopt
->files
[cnt
] = NULL
;
2234 spin_lock(&dq_state_lock
);
2235 flags
= dqopt
->flags
& dquot_state_flag(DQUOT_USAGE_ENABLED
|
2236 DQUOT_LIMITS_ENABLED
,
2238 dqopt
->flags
&= ~dquot_state_flag(DQUOT_STATE_FLAGS
, cnt
);
2239 spin_unlock(&dq_state_lock
);
2240 mutex_unlock(&dqopt
->dqonoff_mutex
);
2242 flags
= dquot_generic_flag(flags
, cnt
);
2243 ret
= vfs_load_quota_inode(inode
, cnt
,
2244 dqopt
->info
[cnt
].dqi_fmt_id
, flags
);
2250 EXPORT_SYMBOL(dquot_resume
);
2252 int dquot_quota_on(struct super_block
*sb
, int type
, int format_id
,
2255 int error
= security_quota_on(path
->dentry
);
2258 /* Quota file not on the same filesystem? */
2259 if (path
->dentry
->d_sb
!= sb
)
2262 error
= vfs_load_quota_inode(path
->dentry
->d_inode
, type
,
2263 format_id
, DQUOT_USAGE_ENABLED
|
2264 DQUOT_LIMITS_ENABLED
);
2267 EXPORT_SYMBOL(dquot_quota_on
);
2270 * More powerful function for turning on quotas allowing setting
2271 * of individual quota flags
2273 int dquot_enable(struct inode
*inode
, int type
, int format_id
,
2277 struct super_block
*sb
= inode
->i_sb
;
2278 struct quota_info
*dqopt
= sb_dqopt(sb
);
2280 /* Just unsuspend quotas? */
2281 BUG_ON(flags
& DQUOT_SUSPENDED
);
2285 /* Just updating flags needed? */
2286 if (sb_has_quota_loaded(sb
, type
)) {
2287 mutex_lock(&dqopt
->dqonoff_mutex
);
2288 /* Now do a reliable test... */
2289 if (!sb_has_quota_loaded(sb
, type
)) {
2290 mutex_unlock(&dqopt
->dqonoff_mutex
);
2293 if (flags
& DQUOT_USAGE_ENABLED
&&
2294 sb_has_quota_usage_enabled(sb
, type
)) {
2298 if (flags
& DQUOT_LIMITS_ENABLED
&&
2299 sb_has_quota_limits_enabled(sb
, type
)) {
2303 spin_lock(&dq_state_lock
);
2304 sb_dqopt(sb
)->flags
|= dquot_state_flag(flags
, type
);
2305 spin_unlock(&dq_state_lock
);
2307 mutex_unlock(&dqopt
->dqonoff_mutex
);
2312 return vfs_load_quota_inode(inode
, type
, format_id
, flags
);
2314 EXPORT_SYMBOL(dquot_enable
);
2317 * This function is used when filesystem needs to initialize quotas
2318 * during mount time.
2320 int dquot_quota_on_mount(struct super_block
*sb
, char *qf_name
,
2321 int format_id
, int type
)
2323 struct dentry
*dentry
;
2326 mutex_lock(&sb
->s_root
->d_inode
->i_mutex
);
2327 dentry
= lookup_one_len(qf_name
, sb
->s_root
, strlen(qf_name
));
2328 mutex_unlock(&sb
->s_root
->d_inode
->i_mutex
);
2330 return PTR_ERR(dentry
);
2332 if (!dentry
->d_inode
) {
2337 error
= security_quota_on(dentry
);
2339 error
= vfs_load_quota_inode(dentry
->d_inode
, type
, format_id
,
2340 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2346 EXPORT_SYMBOL(dquot_quota_on_mount
);
2348 static inline qsize_t
qbtos(qsize_t blocks
)
2350 return blocks
<< QIF_DQBLKSIZE_BITS
;
2353 static inline qsize_t
stoqb(qsize_t space
)
2355 return (space
+ QIF_DQBLKSIZE
- 1) >> QIF_DQBLKSIZE_BITS
;
2358 /* Generic routine for getting common part of quota structure */
2359 static void do_get_dqblk(struct dquot
*dquot
, struct fs_disk_quota
*di
)
2361 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2363 memset(di
, 0, sizeof(*di
));
2364 di
->d_version
= FS_DQUOT_VERSION
;
2365 di
->d_flags
= dquot
->dq_id
.type
== USRQUOTA
?
2366 FS_USER_QUOTA
: FS_GROUP_QUOTA
;
2367 di
->d_id
= from_kqid_munged(current_user_ns(), dquot
->dq_id
);
2369 spin_lock(&dq_data_lock
);
2370 di
->d_blk_hardlimit
= stoqb(dm
->dqb_bhardlimit
);
2371 di
->d_blk_softlimit
= stoqb(dm
->dqb_bsoftlimit
);
2372 di
->d_ino_hardlimit
= dm
->dqb_ihardlimit
;
2373 di
->d_ino_softlimit
= dm
->dqb_isoftlimit
;
2374 di
->d_bcount
= dm
->dqb_curspace
+ dm
->dqb_rsvspace
;
2375 di
->d_icount
= dm
->dqb_curinodes
;
2376 di
->d_btimer
= dm
->dqb_btime
;
2377 di
->d_itimer
= dm
->dqb_itime
;
2378 spin_unlock(&dq_data_lock
);
2381 int dquot_get_dqblk(struct super_block
*sb
, struct kqid qid
,
2382 struct fs_disk_quota
*di
)
2384 struct dquot
*dquot
;
2386 dquot
= dqget(sb
, qid
);
2389 do_get_dqblk(dquot
, di
);
2394 EXPORT_SYMBOL(dquot_get_dqblk
);
2396 #define VFS_FS_DQ_MASK \
2397 (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \
2398 FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \
2399 FS_DQ_BTIMER | FS_DQ_ITIMER)
2401 /* Generic routine for setting common part of quota structure */
2402 static int do_set_dqblk(struct dquot
*dquot
, struct fs_disk_quota
*di
)
2404 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2405 int check_blim
= 0, check_ilim
= 0;
2406 struct mem_dqinfo
*dqi
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
];
2408 if (di
->d_fieldmask
& ~VFS_FS_DQ_MASK
)
2411 if (((di
->d_fieldmask
& FS_DQ_BSOFT
) &&
2412 (di
->d_blk_softlimit
> dqi
->dqi_maxblimit
)) ||
2413 ((di
->d_fieldmask
& FS_DQ_BHARD
) &&
2414 (di
->d_blk_hardlimit
> dqi
->dqi_maxblimit
)) ||
2415 ((di
->d_fieldmask
& FS_DQ_ISOFT
) &&
2416 (di
->d_ino_softlimit
> dqi
->dqi_maxilimit
)) ||
2417 ((di
->d_fieldmask
& FS_DQ_IHARD
) &&
2418 (di
->d_ino_hardlimit
> dqi
->dqi_maxilimit
)))
2421 spin_lock(&dq_data_lock
);
2422 if (di
->d_fieldmask
& FS_DQ_BCOUNT
) {
2423 dm
->dqb_curspace
= di
->d_bcount
- dm
->dqb_rsvspace
;
2425 set_bit(DQ_LASTSET_B
+ QIF_SPACE_B
, &dquot
->dq_flags
);
2428 if (di
->d_fieldmask
& FS_DQ_BSOFT
)
2429 dm
->dqb_bsoftlimit
= qbtos(di
->d_blk_softlimit
);
2430 if (di
->d_fieldmask
& FS_DQ_BHARD
)
2431 dm
->dqb_bhardlimit
= qbtos(di
->d_blk_hardlimit
);
2432 if (di
->d_fieldmask
& (FS_DQ_BSOFT
| FS_DQ_BHARD
)) {
2434 set_bit(DQ_LASTSET_B
+ QIF_BLIMITS_B
, &dquot
->dq_flags
);
2437 if (di
->d_fieldmask
& FS_DQ_ICOUNT
) {
2438 dm
->dqb_curinodes
= di
->d_icount
;
2440 set_bit(DQ_LASTSET_B
+ QIF_INODES_B
, &dquot
->dq_flags
);
2443 if (di
->d_fieldmask
& FS_DQ_ISOFT
)
2444 dm
->dqb_isoftlimit
= di
->d_ino_softlimit
;
2445 if (di
->d_fieldmask
& FS_DQ_IHARD
)
2446 dm
->dqb_ihardlimit
= di
->d_ino_hardlimit
;
2447 if (di
->d_fieldmask
& (FS_DQ_ISOFT
| FS_DQ_IHARD
)) {
2449 set_bit(DQ_LASTSET_B
+ QIF_ILIMITS_B
, &dquot
->dq_flags
);
2452 if (di
->d_fieldmask
& FS_DQ_BTIMER
) {
2453 dm
->dqb_btime
= di
->d_btimer
;
2455 set_bit(DQ_LASTSET_B
+ QIF_BTIME_B
, &dquot
->dq_flags
);
2458 if (di
->d_fieldmask
& FS_DQ_ITIMER
) {
2459 dm
->dqb_itime
= di
->d_itimer
;
2461 set_bit(DQ_LASTSET_B
+ QIF_ITIME_B
, &dquot
->dq_flags
);
2465 if (!dm
->dqb_bsoftlimit
||
2466 dm
->dqb_curspace
< dm
->dqb_bsoftlimit
) {
2468 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
2469 } else if (!(di
->d_fieldmask
& FS_DQ_BTIMER
))
2470 /* Set grace only if user hasn't provided his own... */
2471 dm
->dqb_btime
= get_seconds() + dqi
->dqi_bgrace
;
2474 if (!dm
->dqb_isoftlimit
||
2475 dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
2477 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
2478 } else if (!(di
->d_fieldmask
& FS_DQ_ITIMER
))
2479 /* Set grace only if user hasn't provided his own... */
2480 dm
->dqb_itime
= get_seconds() + dqi
->dqi_igrace
;
2482 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
||
2484 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2486 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2487 spin_unlock(&dq_data_lock
);
2488 mark_dquot_dirty(dquot
);
2493 int dquot_set_dqblk(struct super_block
*sb
, struct kqid qid
,
2494 struct fs_disk_quota
*di
)
2496 struct dquot
*dquot
;
2499 dquot
= dqget(sb
, qid
);
2504 rc
= do_set_dqblk(dquot
, di
);
2509 EXPORT_SYMBOL(dquot_set_dqblk
);
2511 /* Generic routine for getting common part of quota file information */
2512 int dquot_get_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2514 struct mem_dqinfo
*mi
;
2516 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2517 if (!sb_has_quota_active(sb
, type
)) {
2518 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2521 mi
= sb_dqopt(sb
)->info
+ type
;
2522 spin_lock(&dq_data_lock
);
2523 ii
->dqi_bgrace
= mi
->dqi_bgrace
;
2524 ii
->dqi_igrace
= mi
->dqi_igrace
;
2525 ii
->dqi_flags
= mi
->dqi_flags
& DQF_GETINFO_MASK
;
2526 ii
->dqi_valid
= IIF_ALL
;
2527 spin_unlock(&dq_data_lock
);
2528 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2531 EXPORT_SYMBOL(dquot_get_dqinfo
);
2533 /* Generic routine for setting common part of quota file information */
2534 int dquot_set_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2536 struct mem_dqinfo
*mi
;
2539 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2540 if (!sb_has_quota_active(sb
, type
)) {
2544 mi
= sb_dqopt(sb
)->info
+ type
;
2545 spin_lock(&dq_data_lock
);
2546 if (ii
->dqi_valid
& IIF_BGRACE
)
2547 mi
->dqi_bgrace
= ii
->dqi_bgrace
;
2548 if (ii
->dqi_valid
& IIF_IGRACE
)
2549 mi
->dqi_igrace
= ii
->dqi_igrace
;
2550 if (ii
->dqi_valid
& IIF_FLAGS
)
2551 mi
->dqi_flags
= (mi
->dqi_flags
& ~DQF_SETINFO_MASK
) |
2552 (ii
->dqi_flags
& DQF_SETINFO_MASK
);
2553 spin_unlock(&dq_data_lock
);
2554 mark_info_dirty(sb
, type
);
2555 /* Force write to disk */
2556 sb
->dq_op
->write_info(sb
, type
);
2558 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2561 EXPORT_SYMBOL(dquot_set_dqinfo
);
2563 const struct quotactl_ops dquot_quotactl_ops
= {
2564 .quota_on
= dquot_quota_on
,
2565 .quota_off
= dquot_quota_off
,
2566 .quota_sync
= dquot_quota_sync
,
2567 .get_info
= dquot_get_dqinfo
,
2568 .set_info
= dquot_set_dqinfo
,
2569 .get_dqblk
= dquot_get_dqblk
,
2570 .set_dqblk
= dquot_set_dqblk
2572 EXPORT_SYMBOL(dquot_quotactl_ops
);
2574 static int do_proc_dqstats(struct ctl_table
*table
, int write
,
2575 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2577 unsigned int type
= (int *)table
->data
- dqstats
.stat
;
2579 /* Update global table */
2580 dqstats
.stat
[type
] =
2581 percpu_counter_sum_positive(&dqstats
.counter
[type
]);
2582 return proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
2585 static ctl_table fs_dqstats_table
[] = {
2587 .procname
= "lookups",
2588 .data
= &dqstats
.stat
[DQST_LOOKUPS
],
2589 .maxlen
= sizeof(int),
2591 .proc_handler
= do_proc_dqstats
,
2594 .procname
= "drops",
2595 .data
= &dqstats
.stat
[DQST_DROPS
],
2596 .maxlen
= sizeof(int),
2598 .proc_handler
= do_proc_dqstats
,
2601 .procname
= "reads",
2602 .data
= &dqstats
.stat
[DQST_READS
],
2603 .maxlen
= sizeof(int),
2605 .proc_handler
= do_proc_dqstats
,
2608 .procname
= "writes",
2609 .data
= &dqstats
.stat
[DQST_WRITES
],
2610 .maxlen
= sizeof(int),
2612 .proc_handler
= do_proc_dqstats
,
2615 .procname
= "cache_hits",
2616 .data
= &dqstats
.stat
[DQST_CACHE_HITS
],
2617 .maxlen
= sizeof(int),
2619 .proc_handler
= do_proc_dqstats
,
2622 .procname
= "allocated_dquots",
2623 .data
= &dqstats
.stat
[DQST_ALLOC_DQUOTS
],
2624 .maxlen
= sizeof(int),
2626 .proc_handler
= do_proc_dqstats
,
2629 .procname
= "free_dquots",
2630 .data
= &dqstats
.stat
[DQST_FREE_DQUOTS
],
2631 .maxlen
= sizeof(int),
2633 .proc_handler
= do_proc_dqstats
,
2636 .procname
= "syncs",
2637 .data
= &dqstats
.stat
[DQST_SYNCS
],
2638 .maxlen
= sizeof(int),
2640 .proc_handler
= do_proc_dqstats
,
2642 #ifdef CONFIG_PRINT_QUOTA_WARNING
2644 .procname
= "warnings",
2645 .data
= &flag_print_warnings
,
2646 .maxlen
= sizeof(int),
2648 .proc_handler
= proc_dointvec
,
2654 static ctl_table fs_table
[] = {
2656 .procname
= "quota",
2658 .child
= fs_dqstats_table
,
2663 static ctl_table sys_table
[] = {
2672 static int __init
dquot_init(void)
2675 unsigned long nr_hash
, order
;
2677 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2679 register_sysctl_table(sys_table
);
2681 dquot_cachep
= kmem_cache_create("dquot",
2682 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2683 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2684 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2688 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
2690 panic("Cannot create dquot hash table");
2692 for (i
= 0; i
< _DQST_DQSTAT_LAST
; i
++) {
2693 ret
= percpu_counter_init(&dqstats
.counter
[i
], 0);
2695 panic("Cannot create dquot stat counters");
2698 /* Find power-of-two hlist_heads which can fit into allocation */
2699 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2703 } while (nr_hash
>> dq_hash_bits
);
2706 nr_hash
= 1UL << dq_hash_bits
;
2707 dq_hash_mask
= nr_hash
- 1;
2708 for (i
= 0; i
< nr_hash
; i
++)
2709 INIT_HLIST_HEAD(dquot_hash
+ i
);
2711 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2712 nr_hash
, order
, (PAGE_SIZE
<< order
));
2714 register_shrinker(&dqcache_shrinker
);
2718 module_init(dquot_init
);