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
, unsigned int id
, int type
)
260 tmp
= (((unsigned long)sb
>>L1_CACHE_SHIFT
) ^ id
) * (MAXQUOTAS
- type
);
261 return (tmp
+ (tmp
>> dq_hash_bits
)) & dq_hash_mask
;
265 * Following list functions expect dq_list_lock to be held
267 static inline void insert_dquot_hash(struct dquot
*dquot
)
269 struct hlist_head
*head
;
270 head
= dquot_hash
+ hashfn(dquot
->dq_sb
, dquot
->dq_id
, dquot
->dq_type
);
271 hlist_add_head(&dquot
->dq_hash
, head
);
274 static inline void remove_dquot_hash(struct dquot
*dquot
)
276 hlist_del_init(&dquot
->dq_hash
);
279 static struct dquot
*find_dquot(unsigned int hashent
, struct super_block
*sb
,
280 unsigned int id
, int type
)
282 struct hlist_node
*node
;
285 hlist_for_each (node
, dquot_hash
+hashent
) {
286 dquot
= hlist_entry(node
, struct dquot
, dq_hash
);
287 if (dquot
->dq_sb
== sb
&& dquot
->dq_id
== id
&&
288 dquot
->dq_type
== type
)
294 /* Add a dquot to the tail of the free list */
295 static inline void put_dquot_last(struct dquot
*dquot
)
297 list_add_tail(&dquot
->dq_free
, &free_dquots
);
298 dqstats_inc(DQST_FREE_DQUOTS
);
301 static inline void remove_free_dquot(struct dquot
*dquot
)
303 if (list_empty(&dquot
->dq_free
))
305 list_del_init(&dquot
->dq_free
);
306 dqstats_dec(DQST_FREE_DQUOTS
);
309 static inline void put_inuse(struct dquot
*dquot
)
311 /* We add to the back of inuse list so we don't have to restart
312 * when traversing this list and we block */
313 list_add_tail(&dquot
->dq_inuse
, &inuse_list
);
314 dqstats_inc(DQST_ALLOC_DQUOTS
);
317 static inline void remove_inuse(struct dquot
*dquot
)
319 dqstats_dec(DQST_ALLOC_DQUOTS
);
320 list_del(&dquot
->dq_inuse
);
323 * End of list functions needing dq_list_lock
326 static void wait_on_dquot(struct dquot
*dquot
)
328 mutex_lock(&dquot
->dq_lock
);
329 mutex_unlock(&dquot
->dq_lock
);
332 static inline int dquot_dirty(struct dquot
*dquot
)
334 return test_bit(DQ_MOD_B
, &dquot
->dq_flags
);
337 static inline int mark_dquot_dirty(struct dquot
*dquot
)
339 return dquot
->dq_sb
->dq_op
->mark_dirty(dquot
);
342 /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */
343 int dquot_mark_dquot_dirty(struct dquot
*dquot
)
347 /* If quota is dirty already, we don't have to acquire dq_list_lock */
348 if (test_bit(DQ_MOD_B
, &dquot
->dq_flags
))
351 spin_lock(&dq_list_lock
);
352 if (!test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
)) {
353 list_add(&dquot
->dq_dirty
, &sb_dqopt(dquot
->dq_sb
)->
354 info
[dquot
->dq_type
].dqi_dirty_list
);
357 spin_unlock(&dq_list_lock
);
360 EXPORT_SYMBOL(dquot_mark_dquot_dirty
);
362 /* Dirtify all the dquots - this can block when journalling */
363 static inline int mark_all_dquot_dirty(struct dquot
* const *dquot
)
368 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
370 /* Even in case of error we have to continue */
371 ret
= mark_dquot_dirty(dquot
[cnt
]);
378 static inline void dqput_all(struct dquot
**dquot
)
382 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
386 /* This function needs dq_list_lock */
387 static inline int clear_dquot_dirty(struct dquot
*dquot
)
389 if (!test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
))
391 list_del_init(&dquot
->dq_dirty
);
395 void mark_info_dirty(struct super_block
*sb
, int type
)
397 set_bit(DQF_INFO_DIRTY_B
, &sb_dqopt(sb
)->info
[type
].dqi_flags
);
399 EXPORT_SYMBOL(mark_info_dirty
);
402 * Read dquot from disk and alloc space for it
405 int dquot_acquire(struct dquot
*dquot
)
407 int ret
= 0, ret2
= 0;
408 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
410 mutex_lock(&dquot
->dq_lock
);
411 mutex_lock(&dqopt
->dqio_mutex
);
412 if (!test_bit(DQ_READ_B
, &dquot
->dq_flags
))
413 ret
= dqopt
->ops
[dquot
->dq_type
]->read_dqblk(dquot
);
416 set_bit(DQ_READ_B
, &dquot
->dq_flags
);
417 /* Instantiate dquot if needed */
418 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && !dquot
->dq_off
) {
419 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
420 /* Write the info if needed */
421 if (info_dirty(&dqopt
->info
[dquot
->dq_type
])) {
422 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(
423 dquot
->dq_sb
, dquot
->dq_type
);
432 set_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
434 mutex_unlock(&dqopt
->dqio_mutex
);
435 mutex_unlock(&dquot
->dq_lock
);
438 EXPORT_SYMBOL(dquot_acquire
);
441 * Write dquot to disk
443 int dquot_commit(struct dquot
*dquot
)
446 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
448 mutex_lock(&dqopt
->dqio_mutex
);
449 spin_lock(&dq_list_lock
);
450 if (!clear_dquot_dirty(dquot
)) {
451 spin_unlock(&dq_list_lock
);
454 spin_unlock(&dq_list_lock
);
455 /* Inactive dquot can be only if there was error during read/init
456 * => we have better not writing it */
457 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
458 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
462 mutex_unlock(&dqopt
->dqio_mutex
);
465 EXPORT_SYMBOL(dquot_commit
);
470 int dquot_release(struct dquot
*dquot
)
472 int ret
= 0, ret2
= 0;
473 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
475 mutex_lock(&dquot
->dq_lock
);
476 /* Check whether we are not racing with some other dqget() */
477 if (atomic_read(&dquot
->dq_count
) > 1)
479 mutex_lock(&dqopt
->dqio_mutex
);
480 if (dqopt
->ops
[dquot
->dq_type
]->release_dqblk
) {
481 ret
= dqopt
->ops
[dquot
->dq_type
]->release_dqblk(dquot
);
483 if (info_dirty(&dqopt
->info
[dquot
->dq_type
])) {
484 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(
485 dquot
->dq_sb
, dquot
->dq_type
);
490 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
491 mutex_unlock(&dqopt
->dqio_mutex
);
493 mutex_unlock(&dquot
->dq_lock
);
496 EXPORT_SYMBOL(dquot_release
);
498 void dquot_destroy(struct dquot
*dquot
)
500 kmem_cache_free(dquot_cachep
, dquot
);
502 EXPORT_SYMBOL(dquot_destroy
);
504 static inline void do_destroy_dquot(struct dquot
*dquot
)
506 dquot
->dq_sb
->dq_op
->destroy_dquot(dquot
);
509 /* Invalidate all dquots on the list. Note that this function is called after
510 * quota is disabled and pointers from inodes removed so there cannot be new
511 * quota users. There can still be some users of quotas due to inodes being
512 * just deleted or pruned by prune_icache() (those are not attached to any
513 * list) or parallel quotactl call. We have to wait for such users.
515 static void invalidate_dquots(struct super_block
*sb
, int type
)
517 struct dquot
*dquot
, *tmp
;
520 spin_lock(&dq_list_lock
);
521 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
522 if (dquot
->dq_sb
!= sb
)
524 if (dquot
->dq_type
!= type
)
526 /* Wait for dquot users */
527 if (atomic_read(&dquot
->dq_count
)) {
530 atomic_inc(&dquot
->dq_count
);
531 prepare_to_wait(&dquot
->dq_wait_unused
, &wait
,
532 TASK_UNINTERRUPTIBLE
);
533 spin_unlock(&dq_list_lock
);
534 /* Once dqput() wakes us up, we know it's time to free
536 * IMPORTANT: we rely on the fact that there is always
537 * at most one process waiting for dquot to free.
538 * Otherwise dq_count would be > 1 and we would never
541 if (atomic_read(&dquot
->dq_count
) > 1)
543 finish_wait(&dquot
->dq_wait_unused
, &wait
);
545 /* At this moment dquot() need not exist (it could be
546 * reclaimed by prune_dqcache(). Hence we must
551 * Quota now has no users and it has been written on last
554 remove_dquot_hash(dquot
);
555 remove_free_dquot(dquot
);
557 do_destroy_dquot(dquot
);
559 spin_unlock(&dq_list_lock
);
562 /* Call callback for every active dquot on given filesystem */
563 int dquot_scan_active(struct super_block
*sb
,
564 int (*fn
)(struct dquot
*dquot
, unsigned long priv
),
567 struct dquot
*dquot
, *old_dquot
= NULL
;
570 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
571 spin_lock(&dq_list_lock
);
572 list_for_each_entry(dquot
, &inuse_list
, dq_inuse
) {
573 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
575 if (dquot
->dq_sb
!= sb
)
577 /* Now we have active dquot so we can just increase use count */
578 atomic_inc(&dquot
->dq_count
);
579 spin_unlock(&dq_list_lock
);
580 dqstats_inc(DQST_LOOKUPS
);
583 ret
= fn(dquot
, priv
);
586 spin_lock(&dq_list_lock
);
587 /* We are safe to continue now because our dquot could not
588 * be moved out of the inuse list while we hold the reference */
590 spin_unlock(&dq_list_lock
);
593 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
596 EXPORT_SYMBOL(dquot_scan_active
);
598 /* Write all dquot structures to quota files */
599 int dquot_writeback_dquots(struct super_block
*sb
, int type
)
601 struct list_head
*dirty
;
603 struct quota_info
*dqopt
= sb_dqopt(sb
);
607 mutex_lock(&dqopt
->dqonoff_mutex
);
608 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
609 if (type
!= -1 && cnt
!= type
)
611 if (!sb_has_quota_active(sb
, cnt
))
613 spin_lock(&dq_list_lock
);
614 dirty
= &dqopt
->info
[cnt
].dqi_dirty_list
;
615 while (!list_empty(dirty
)) {
616 dquot
= list_first_entry(dirty
, struct dquot
,
618 /* Dirty and inactive can be only bad dquot... */
619 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
620 clear_dquot_dirty(dquot
);
623 /* Now we have active dquot from which someone is
624 * holding reference so we can safely just increase
626 atomic_inc(&dquot
->dq_count
);
627 spin_unlock(&dq_list_lock
);
628 dqstats_inc(DQST_LOOKUPS
);
629 err
= sb
->dq_op
->write_dquot(dquot
);
633 spin_lock(&dq_list_lock
);
635 spin_unlock(&dq_list_lock
);
638 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
639 if ((cnt
== type
|| type
== -1) && sb_has_quota_active(sb
, cnt
)
640 && info_dirty(&dqopt
->info
[cnt
]))
641 sb
->dq_op
->write_info(sb
, cnt
);
642 dqstats_inc(DQST_SYNCS
);
643 mutex_unlock(&dqopt
->dqonoff_mutex
);
647 EXPORT_SYMBOL(dquot_writeback_dquots
);
649 /* Write all dquot structures to disk and make them visible from userspace */
650 int dquot_quota_sync(struct super_block
*sb
, int type
)
652 struct quota_info
*dqopt
= sb_dqopt(sb
);
656 ret
= dquot_writeback_dquots(sb
, type
);
659 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
662 /* This is not very clever (and fast) but currently I don't know about
663 * any other simple way of getting quota data to disk and we must get
664 * them there for userspace to be visible... */
665 if (sb
->s_op
->sync_fs
)
666 sb
->s_op
->sync_fs(sb
, 1);
667 sync_blockdev(sb
->s_bdev
);
670 * Now when everything is written we can discard the pagecache so
671 * that userspace sees the changes.
673 mutex_lock(&dqopt
->dqonoff_mutex
);
674 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
675 if (type
!= -1 && cnt
!= type
)
677 if (!sb_has_quota_active(sb
, cnt
))
679 mutex_lock(&dqopt
->files
[cnt
]->i_mutex
);
680 truncate_inode_pages(&dqopt
->files
[cnt
]->i_data
, 0);
681 mutex_unlock(&dqopt
->files
[cnt
]->i_mutex
);
683 mutex_unlock(&dqopt
->dqonoff_mutex
);
687 EXPORT_SYMBOL(dquot_quota_sync
);
689 /* Free unused dquots from cache */
690 static void prune_dqcache(int count
)
692 struct list_head
*head
;
695 head
= free_dquots
.prev
;
696 while (head
!= &free_dquots
&& count
) {
697 dquot
= list_entry(head
, struct dquot
, dq_free
);
698 remove_dquot_hash(dquot
);
699 remove_free_dquot(dquot
);
701 do_destroy_dquot(dquot
);
703 head
= free_dquots
.prev
;
708 * This is called from kswapd when we think we need some
711 static int shrink_dqcache_memory(struct shrinker
*shrink
,
712 struct shrink_control
*sc
)
714 int nr
= sc
->nr_to_scan
;
717 spin_lock(&dq_list_lock
);
719 spin_unlock(&dq_list_lock
);
722 percpu_counter_read_positive(&dqstats
.counter
[DQST_FREE_DQUOTS
])
723 /100) * sysctl_vfs_cache_pressure
;
726 static struct shrinker dqcache_shrinker
= {
727 .shrink
= shrink_dqcache_memory
,
728 .seeks
= DEFAULT_SEEKS
,
732 * Put reference to dquot
733 * NOTE: If you change this function please check whether dqput_blocks() works right...
735 void dqput(struct dquot
*dquot
)
741 #ifdef CONFIG_QUOTA_DEBUG
742 if (!atomic_read(&dquot
->dq_count
)) {
743 quota_error(dquot
->dq_sb
, "trying to free free dquot of %s %d",
744 quotatypes
[dquot
->dq_type
], dquot
->dq_id
);
748 dqstats_inc(DQST_DROPS
);
750 spin_lock(&dq_list_lock
);
751 if (atomic_read(&dquot
->dq_count
) > 1) {
752 /* We have more than one user... nothing to do */
753 atomic_dec(&dquot
->dq_count
);
754 /* Releasing dquot during quotaoff phase? */
755 if (!sb_has_quota_active(dquot
->dq_sb
, dquot
->dq_type
) &&
756 atomic_read(&dquot
->dq_count
) == 1)
757 wake_up(&dquot
->dq_wait_unused
);
758 spin_unlock(&dq_list_lock
);
761 /* Need to release dquot? */
762 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && dquot_dirty(dquot
)) {
763 spin_unlock(&dq_list_lock
);
764 /* Commit dquot before releasing */
765 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
767 quota_error(dquot
->dq_sb
, "Can't write quota structure"
768 " (error %d). Quota may get out of sync!",
771 * We clear dirty bit anyway, so that we avoid
774 spin_lock(&dq_list_lock
);
775 clear_dquot_dirty(dquot
);
776 spin_unlock(&dq_list_lock
);
780 /* Clear flag in case dquot was inactive (something bad happened) */
781 clear_dquot_dirty(dquot
);
782 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
783 spin_unlock(&dq_list_lock
);
784 dquot
->dq_sb
->dq_op
->release_dquot(dquot
);
787 atomic_dec(&dquot
->dq_count
);
788 #ifdef CONFIG_QUOTA_DEBUG
790 BUG_ON(!list_empty(&dquot
->dq_free
));
792 put_dquot_last(dquot
);
793 spin_unlock(&dq_list_lock
);
795 EXPORT_SYMBOL(dqput
);
797 struct dquot
*dquot_alloc(struct super_block
*sb
, int type
)
799 return kmem_cache_zalloc(dquot_cachep
, GFP_NOFS
);
801 EXPORT_SYMBOL(dquot_alloc
);
803 static struct dquot
*get_empty_dquot(struct super_block
*sb
, int type
)
807 dquot
= sb
->dq_op
->alloc_dquot(sb
, type
);
811 mutex_init(&dquot
->dq_lock
);
812 INIT_LIST_HEAD(&dquot
->dq_free
);
813 INIT_LIST_HEAD(&dquot
->dq_inuse
);
814 INIT_HLIST_NODE(&dquot
->dq_hash
);
815 INIT_LIST_HEAD(&dquot
->dq_dirty
);
816 init_waitqueue_head(&dquot
->dq_wait_unused
);
818 dquot
->dq_type
= type
;
819 atomic_set(&dquot
->dq_count
, 1);
825 * Get reference to dquot
827 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
828 * destroying our dquot by:
829 * a) checking for quota flags under dq_list_lock and
830 * b) getting a reference to dquot before we release dq_list_lock
832 struct dquot
*dqget(struct super_block
*sb
, unsigned int id
, int type
)
834 unsigned int hashent
= hashfn(sb
, id
, type
);
835 struct dquot
*dquot
= NULL
, *empty
= NULL
;
837 if (!sb_has_quota_active(sb
, type
))
840 spin_lock(&dq_list_lock
);
841 spin_lock(&dq_state_lock
);
842 if (!sb_has_quota_active(sb
, type
)) {
843 spin_unlock(&dq_state_lock
);
844 spin_unlock(&dq_list_lock
);
847 spin_unlock(&dq_state_lock
);
849 dquot
= find_dquot(hashent
, sb
, id
, type
);
852 spin_unlock(&dq_list_lock
);
853 empty
= get_empty_dquot(sb
, type
);
855 schedule(); /* Try to wait for a moment... */
861 /* all dquots go on the inuse_list */
863 /* hash it first so it can be found */
864 insert_dquot_hash(dquot
);
865 spin_unlock(&dq_list_lock
);
866 dqstats_inc(DQST_LOOKUPS
);
868 if (!atomic_read(&dquot
->dq_count
))
869 remove_free_dquot(dquot
);
870 atomic_inc(&dquot
->dq_count
);
871 spin_unlock(&dq_list_lock
);
872 dqstats_inc(DQST_CACHE_HITS
);
873 dqstats_inc(DQST_LOOKUPS
);
875 /* Wait for dq_lock - after this we know that either dquot_release() is
876 * already finished or it will be canceled due to dq_count > 1 test */
877 wait_on_dquot(dquot
);
878 /* Read the dquot / allocate space in quota file */
879 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) &&
880 sb
->dq_op
->acquire_dquot(dquot
) < 0) {
885 #ifdef CONFIG_QUOTA_DEBUG
886 BUG_ON(!dquot
->dq_sb
); /* Has somebody invalidated entry under us? */
890 do_destroy_dquot(empty
);
894 EXPORT_SYMBOL(dqget
);
896 static int dqinit_needed(struct inode
*inode
, int type
)
900 if (IS_NOQUOTA(inode
))
903 return !inode
->i_dquot
[type
];
904 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
905 if (!inode
->i_dquot
[cnt
])
910 /* This routine is guarded by dqonoff_mutex mutex */
911 static void add_dquot_ref(struct super_block
*sb
, int type
)
913 struct inode
*inode
, *old_inode
= NULL
;
914 #ifdef CONFIG_QUOTA_DEBUG
918 spin_lock(&inode_sb_list_lock
);
919 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
920 spin_lock(&inode
->i_lock
);
921 if ((inode
->i_state
& (I_FREEING
|I_WILL_FREE
|I_NEW
)) ||
922 !atomic_read(&inode
->i_writecount
) ||
923 !dqinit_needed(inode
, type
)) {
924 spin_unlock(&inode
->i_lock
);
928 spin_unlock(&inode
->i_lock
);
929 spin_unlock(&inode_sb_list_lock
);
931 #ifdef CONFIG_QUOTA_DEBUG
932 if (unlikely(inode_get_rsv_space(inode
) > 0))
936 __dquot_initialize(inode
, type
);
939 * We hold a reference to 'inode' so it couldn't have been
940 * removed from s_inodes list while we dropped the
941 * inode_sb_list_lock We cannot iput the inode now as we can be
942 * holding the last reference and we cannot iput it under
943 * inode_sb_list_lock. So we keep the reference and iput it
947 spin_lock(&inode_sb_list_lock
);
949 spin_unlock(&inode_sb_list_lock
);
952 #ifdef CONFIG_QUOTA_DEBUG
954 quota_error(sb
, "Writes happened before quota was turned on "
955 "thus quota information is probably inconsistent. "
956 "Please run quotacheck(8)");
962 * Return 0 if dqput() won't block.
963 * (note that 1 doesn't necessarily mean blocking)
965 static inline int dqput_blocks(struct dquot
*dquot
)
967 if (atomic_read(&dquot
->dq_count
) <= 1)
973 * Remove references to dquots from inode and add dquot to list for freeing
974 * if we have the last reference to dquot
975 * We can't race with anybody because we hold dqptr_sem for writing...
977 static int remove_inode_dquot_ref(struct inode
*inode
, int type
,
978 struct list_head
*tofree_head
)
980 struct dquot
*dquot
= inode
->i_dquot
[type
];
982 inode
->i_dquot
[type
] = NULL
;
984 if (dqput_blocks(dquot
)) {
985 #ifdef CONFIG_QUOTA_DEBUG
986 if (atomic_read(&dquot
->dq_count
) != 1)
987 quota_error(inode
->i_sb
, "Adding dquot with "
988 "dq_count %d to dispose list",
989 atomic_read(&dquot
->dq_count
));
991 spin_lock(&dq_list_lock
);
992 /* As dquot must have currently users it can't be on
993 * the free list... */
994 list_add(&dquot
->dq_free
, tofree_head
);
995 spin_unlock(&dq_list_lock
);
999 dqput(dquot
); /* We have guaranteed we won't block */
1005 * Free list of dquots
1006 * Dquots are removed from inodes and no new references can be got so we are
1007 * the only ones holding reference
1009 static void put_dquot_list(struct list_head
*tofree_head
)
1011 struct list_head
*act_head
;
1012 struct dquot
*dquot
;
1014 act_head
= tofree_head
->next
;
1015 while (act_head
!= tofree_head
) {
1016 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
1017 act_head
= act_head
->next
;
1018 /* Remove dquot from the list so we won't have problems... */
1019 list_del_init(&dquot
->dq_free
);
1024 static void remove_dquot_ref(struct super_block
*sb
, int type
,
1025 struct list_head
*tofree_head
)
1027 struct inode
*inode
;
1030 spin_lock(&inode_sb_list_lock
);
1031 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
1033 * We have to scan also I_NEW inodes because they can already
1034 * have quota pointer initialized. Luckily, we need to touch
1035 * only quota pointers and these have separate locking
1038 if (!IS_NOQUOTA(inode
)) {
1039 if (unlikely(inode_get_rsv_space(inode
) > 0))
1041 remove_inode_dquot_ref(inode
, type
, tofree_head
);
1044 spin_unlock(&inode_sb_list_lock
);
1045 #ifdef CONFIG_QUOTA_DEBUG
1047 printk(KERN_WARNING
"VFS (%s): Writes happened after quota"
1048 " was disabled thus quota information is probably "
1049 "inconsistent. Please run quotacheck(8).\n", sb
->s_id
);
1054 /* Gather all references from inodes and drop them */
1055 static void drop_dquot_ref(struct super_block
*sb
, int type
)
1057 LIST_HEAD(tofree_head
);
1060 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1061 remove_dquot_ref(sb
, type
, &tofree_head
);
1062 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1063 put_dquot_list(&tofree_head
);
1067 static inline void dquot_incr_inodes(struct dquot
*dquot
, qsize_t number
)
1069 dquot
->dq_dqb
.dqb_curinodes
+= number
;
1072 static inline void dquot_incr_space(struct dquot
*dquot
, qsize_t number
)
1074 dquot
->dq_dqb
.dqb_curspace
+= number
;
1077 static inline void dquot_resv_space(struct dquot
*dquot
, qsize_t number
)
1079 dquot
->dq_dqb
.dqb_rsvspace
+= number
;
1083 * Claim reserved quota space
1085 static void dquot_claim_reserved_space(struct dquot
*dquot
, qsize_t number
)
1087 if (dquot
->dq_dqb
.dqb_rsvspace
< number
) {
1089 number
= dquot
->dq_dqb
.dqb_rsvspace
;
1091 dquot
->dq_dqb
.dqb_curspace
+= number
;
1092 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1096 void dquot_free_reserved_space(struct dquot
*dquot
, qsize_t number
)
1098 if (dquot
->dq_dqb
.dqb_rsvspace
>= number
)
1099 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1102 dquot
->dq_dqb
.dqb_rsvspace
= 0;
1106 static void dquot_decr_inodes(struct dquot
*dquot
, qsize_t number
)
1108 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1109 dquot
->dq_dqb
.dqb_curinodes
>= number
)
1110 dquot
->dq_dqb
.dqb_curinodes
-= number
;
1112 dquot
->dq_dqb
.dqb_curinodes
= 0;
1113 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1114 dquot
->dq_dqb
.dqb_itime
= (time_t) 0;
1115 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
1118 static void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
1120 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1121 dquot
->dq_dqb
.dqb_curspace
>= number
)
1122 dquot
->dq_dqb
.dqb_curspace
-= number
;
1124 dquot
->dq_dqb
.dqb_curspace
= 0;
1125 if (dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1126 dquot
->dq_dqb
.dqb_btime
= (time_t) 0;
1127 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1131 struct super_block
*w_sb
;
1137 static int warning_issued(struct dquot
*dquot
, const int warntype
)
1139 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
1140 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
1141 ((warntype
== QUOTA_NL_IHARDWARN
||
1142 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
1146 return test_and_set_bit(flag
, &dquot
->dq_flags
);
1149 #ifdef CONFIG_PRINT_QUOTA_WARNING
1150 static int flag_print_warnings
= 1;
1152 static int need_print_warning(struct dquot_warn
*warn
)
1154 if (!flag_print_warnings
)
1157 switch (warn
->w_dq_type
) {
1159 return current_fsuid() == warn
->w_dq_id
;
1161 return in_group_p(warn
->w_dq_id
);
1166 /* Print warning to user which exceeded quota */
1167 static void print_warning(struct dquot_warn
*warn
)
1170 struct tty_struct
*tty
;
1171 int warntype
= warn
->w_type
;
1173 if (warntype
== QUOTA_NL_IHARDBELOW
||
1174 warntype
== QUOTA_NL_ISOFTBELOW
||
1175 warntype
== QUOTA_NL_BHARDBELOW
||
1176 warntype
== QUOTA_NL_BSOFTBELOW
|| !need_print_warning(warn
))
1179 tty
= get_current_tty();
1182 tty_write_message(tty
, warn
->w_sb
->s_id
);
1183 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
1184 tty_write_message(tty
, ": warning, ");
1186 tty_write_message(tty
, ": write failed, ");
1187 tty_write_message(tty
, quotatypes
[warn
->w_dq_type
]);
1189 case QUOTA_NL_IHARDWARN
:
1190 msg
= " file limit reached.\r\n";
1192 case QUOTA_NL_ISOFTLONGWARN
:
1193 msg
= " file quota exceeded too long.\r\n";
1195 case QUOTA_NL_ISOFTWARN
:
1196 msg
= " file quota exceeded.\r\n";
1198 case QUOTA_NL_BHARDWARN
:
1199 msg
= " block limit reached.\r\n";
1201 case QUOTA_NL_BSOFTLONGWARN
:
1202 msg
= " block quota exceeded too long.\r\n";
1204 case QUOTA_NL_BSOFTWARN
:
1205 msg
= " block quota exceeded.\r\n";
1208 tty_write_message(tty
, msg
);
1213 static void prepare_warning(struct dquot_warn
*warn
, struct dquot
*dquot
,
1216 if (warning_issued(dquot
, warntype
))
1218 warn
->w_type
= warntype
;
1219 warn
->w_sb
= dquot
->dq_sb
;
1220 warn
->w_dq_id
= dquot
->dq_id
;
1221 warn
->w_dq_type
= dquot
->dq_type
;
1225 * Write warnings to the console and send warning messages over netlink.
1227 * Note that this function can call into tty and networking code.
1229 static void flush_warnings(struct dquot_warn
*warn
)
1233 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1234 if (warn
[i
].w_type
== QUOTA_NL_NOWARN
)
1236 #ifdef CONFIG_PRINT_QUOTA_WARNING
1237 print_warning(&warn
[i
]);
1239 quota_send_warning(warn
[i
].w_dq_type
, warn
[i
].w_dq_id
,
1240 warn
[i
].w_sb
->s_dev
, warn
[i
].w_type
);
1244 static int ignore_hardlimit(struct dquot
*dquot
)
1246 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
1248 return capable(CAP_SYS_RESOURCE
) &&
1249 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
||
1250 !(info
->dqi_flags
& V1_DQF_RSQUASH
));
1253 /* needs dq_data_lock */
1254 static int check_idq(struct dquot
*dquot
, qsize_t inodes
,
1255 struct dquot_warn
*warn
)
1257 qsize_t newinodes
= dquot
->dq_dqb
.dqb_curinodes
+ inodes
;
1259 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
) ||
1260 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1263 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1264 newinodes
> dquot
->dq_dqb
.dqb_ihardlimit
&&
1265 !ignore_hardlimit(dquot
)) {
1266 prepare_warning(warn
, dquot
, QUOTA_NL_IHARDWARN
);
1270 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1271 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1272 dquot
->dq_dqb
.dqb_itime
&&
1273 get_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1274 !ignore_hardlimit(dquot
)) {
1275 prepare_warning(warn
, dquot
, QUOTA_NL_ISOFTLONGWARN
);
1279 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1280 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1281 dquot
->dq_dqb
.dqb_itime
== 0) {
1282 prepare_warning(warn
, dquot
, QUOTA_NL_ISOFTWARN
);
1283 dquot
->dq_dqb
.dqb_itime
= get_seconds() +
1284 sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_igrace
;
1290 /* needs dq_data_lock */
1291 static int check_bdq(struct dquot
*dquot
, qsize_t space
, int prealloc
,
1292 struct dquot_warn
*warn
)
1295 struct super_block
*sb
= dquot
->dq_sb
;
1297 if (!sb_has_quota_limits_enabled(sb
, dquot
->dq_type
) ||
1298 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1301 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
1304 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1305 tspace
> dquot
->dq_dqb
.dqb_bhardlimit
&&
1306 !ignore_hardlimit(dquot
)) {
1308 prepare_warning(warn
, dquot
, QUOTA_NL_BHARDWARN
);
1312 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1313 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1314 dquot
->dq_dqb
.dqb_btime
&&
1315 get_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1316 !ignore_hardlimit(dquot
)) {
1318 prepare_warning(warn
, dquot
, QUOTA_NL_BSOFTLONGWARN
);
1322 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1323 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1324 dquot
->dq_dqb
.dqb_btime
== 0) {
1326 prepare_warning(warn
, dquot
, QUOTA_NL_BSOFTWARN
);
1327 dquot
->dq_dqb
.dqb_btime
= get_seconds() +
1328 sb_dqopt(sb
)->info
[dquot
->dq_type
].dqi_bgrace
;
1332 * We don't allow preallocation to exceed softlimit so exceeding will
1341 static int info_idq_free(struct dquot
*dquot
, qsize_t inodes
)
1345 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1346 dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
||
1347 !sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
))
1348 return QUOTA_NL_NOWARN
;
1350 newinodes
= dquot
->dq_dqb
.dqb_curinodes
- inodes
;
1351 if (newinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1352 return QUOTA_NL_ISOFTBELOW
;
1353 if (dquot
->dq_dqb
.dqb_curinodes
>= dquot
->dq_dqb
.dqb_ihardlimit
&&
1354 newinodes
< dquot
->dq_dqb
.dqb_ihardlimit
)
1355 return QUOTA_NL_IHARDBELOW
;
1356 return QUOTA_NL_NOWARN
;
1359 static int info_bdq_free(struct dquot
*dquot
, qsize_t space
)
1361 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1362 dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1363 return QUOTA_NL_NOWARN
;
1365 if (dquot
->dq_dqb
.dqb_curspace
- space
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1366 return QUOTA_NL_BSOFTBELOW
;
1367 if (dquot
->dq_dqb
.dqb_curspace
>= dquot
->dq_dqb
.dqb_bhardlimit
&&
1368 dquot
->dq_dqb
.dqb_curspace
- space
< dquot
->dq_dqb
.dqb_bhardlimit
)
1369 return QUOTA_NL_BHARDBELOW
;
1370 return QUOTA_NL_NOWARN
;
1373 static int dquot_active(const struct inode
*inode
)
1375 struct super_block
*sb
= inode
->i_sb
;
1377 if (IS_NOQUOTA(inode
))
1379 return sb_any_quota_loaded(sb
) & ~sb_any_quota_suspended(sb
);
1383 * Initialize quota pointers in inode
1385 * We do things in a bit complicated way but by that we avoid calling
1386 * dqget() and thus filesystem callbacks under dqptr_sem.
1388 * It is better to call this function outside of any transaction as it
1389 * might need a lot of space in journal for dquot structure allocation.
1391 static void __dquot_initialize(struct inode
*inode
, int type
)
1393 unsigned int id
= 0;
1395 struct dquot
*got
[MAXQUOTAS
];
1396 struct super_block
*sb
= inode
->i_sb
;
1399 /* First test before acquiring mutex - solves deadlocks when we
1400 * re-enter the quota code and are already holding the mutex */
1401 if (!dquot_active(inode
))
1404 /* First get references to structures we might need. */
1405 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1407 if (type
!= -1 && cnt
!= type
)
1417 got
[cnt
] = dqget(sb
, id
, cnt
);
1420 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1421 if (IS_NOQUOTA(inode
))
1423 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1424 if (type
!= -1 && cnt
!= type
)
1426 /* Avoid races with quotaoff() */
1427 if (!sb_has_quota_active(sb
, cnt
))
1429 /* We could race with quotaon or dqget() could have failed */
1432 if (!inode
->i_dquot
[cnt
]) {
1433 inode
->i_dquot
[cnt
] = got
[cnt
];
1436 * Make quota reservation system happy if someone
1437 * did a write before quota was turned on
1439 rsv
= inode_get_rsv_space(inode
);
1441 dquot_resv_space(inode
->i_dquot
[cnt
], rsv
);
1445 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1446 /* Drop unused references */
1450 void dquot_initialize(struct inode
*inode
)
1452 __dquot_initialize(inode
, -1);
1454 EXPORT_SYMBOL(dquot_initialize
);
1457 * Release all quotas referenced by inode
1459 static void __dquot_drop(struct inode
*inode
)
1462 struct dquot
*put
[MAXQUOTAS
];
1464 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1465 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1466 put
[cnt
] = inode
->i_dquot
[cnt
];
1467 inode
->i_dquot
[cnt
] = NULL
;
1469 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1473 void dquot_drop(struct inode
*inode
)
1477 if (IS_NOQUOTA(inode
))
1481 * Test before calling to rule out calls from proc and such
1482 * where we are not allowed to block. Note that this is
1483 * actually reliable test even without the lock - the caller
1484 * must assure that nobody can come after the DQUOT_DROP and
1485 * add quota pointers back anyway.
1487 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1488 if (inode
->i_dquot
[cnt
])
1492 if (cnt
< MAXQUOTAS
)
1493 __dquot_drop(inode
);
1495 EXPORT_SYMBOL(dquot_drop
);
1498 * inode_reserved_space is managed internally by quota, and protected by
1499 * i_lock similar to i_blocks+i_bytes.
1501 static qsize_t
*inode_reserved_space(struct inode
* inode
)
1503 /* Filesystem must explicitly define it's own method in order to use
1504 * quota reservation interface */
1505 BUG_ON(!inode
->i_sb
->dq_op
->get_reserved_space
);
1506 return inode
->i_sb
->dq_op
->get_reserved_space(inode
);
1509 void inode_add_rsv_space(struct inode
*inode
, qsize_t number
)
1511 spin_lock(&inode
->i_lock
);
1512 *inode_reserved_space(inode
) += number
;
1513 spin_unlock(&inode
->i_lock
);
1515 EXPORT_SYMBOL(inode_add_rsv_space
);
1517 void inode_claim_rsv_space(struct inode
*inode
, qsize_t number
)
1519 spin_lock(&inode
->i_lock
);
1520 *inode_reserved_space(inode
) -= number
;
1521 __inode_add_bytes(inode
, number
);
1522 spin_unlock(&inode
->i_lock
);
1524 EXPORT_SYMBOL(inode_claim_rsv_space
);
1526 void inode_sub_rsv_space(struct inode
*inode
, qsize_t number
)
1528 spin_lock(&inode
->i_lock
);
1529 *inode_reserved_space(inode
) -= number
;
1530 spin_unlock(&inode
->i_lock
);
1532 EXPORT_SYMBOL(inode_sub_rsv_space
);
1534 static qsize_t
inode_get_rsv_space(struct inode
*inode
)
1538 if (!inode
->i_sb
->dq_op
->get_reserved_space
)
1540 spin_lock(&inode
->i_lock
);
1541 ret
= *inode_reserved_space(inode
);
1542 spin_unlock(&inode
->i_lock
);
1546 static void inode_incr_space(struct inode
*inode
, qsize_t number
,
1550 inode_add_rsv_space(inode
, number
);
1552 inode_add_bytes(inode
, number
);
1555 static void inode_decr_space(struct inode
*inode
, qsize_t number
, int reserve
)
1558 inode_sub_rsv_space(inode
, number
);
1560 inode_sub_bytes(inode
, number
);
1564 * This functions updates i_blocks+i_bytes fields and quota information
1565 * (together with appropriate checks).
1567 * NOTE: We absolutely rely on the fact that caller dirties the inode
1568 * (usually helpers in quotaops.h care about this) and holds a handle for
1569 * the current transaction so that dquot write and inode write go into the
1574 * This operation can block, but only after everything is updated
1576 int __dquot_alloc_space(struct inode
*inode
, qsize_t number
, int flags
)
1579 struct dquot_warn warn
[MAXQUOTAS
];
1580 struct dquot
**dquots
= inode
->i_dquot
;
1581 int reserve
= flags
& DQUOT_SPACE_RESERVE
;
1584 * First test before acquiring mutex - solves deadlocks when we
1585 * re-enter the quota code and are already holding the mutex
1587 if (!dquot_active(inode
)) {
1588 inode_incr_space(inode
, number
, reserve
);
1592 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1593 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1594 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1596 spin_lock(&dq_data_lock
);
1597 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1600 ret
= check_bdq(dquots
[cnt
], number
,
1601 !(flags
& DQUOT_SPACE_WARN
), &warn
[cnt
]);
1602 if (ret
&& !(flags
& DQUOT_SPACE_NOFAIL
)) {
1603 spin_unlock(&dq_data_lock
);
1604 goto out_flush_warn
;
1607 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1611 dquot_resv_space(dquots
[cnt
], number
);
1613 dquot_incr_space(dquots
[cnt
], number
);
1615 inode_incr_space(inode
, number
, reserve
);
1616 spin_unlock(&dq_data_lock
);
1619 goto out_flush_warn
;
1620 mark_all_dquot_dirty(dquots
);
1622 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1623 flush_warnings(warn
);
1627 EXPORT_SYMBOL(__dquot_alloc_space
);
1630 * This operation can block, but only after everything is updated
1632 int dquot_alloc_inode(const struct inode
*inode
)
1635 struct dquot_warn warn
[MAXQUOTAS
];
1636 struct dquot
* const *dquots
= inode
->i_dquot
;
1638 /* First test before acquiring mutex - solves deadlocks when we
1639 * re-enter the quota code and are already holding the mutex */
1640 if (!dquot_active(inode
))
1642 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1643 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1644 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1645 spin_lock(&dq_data_lock
);
1646 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1649 ret
= check_idq(dquots
[cnt
], 1, &warn
[cnt
]);
1654 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1657 dquot_incr_inodes(dquots
[cnt
], 1);
1661 spin_unlock(&dq_data_lock
);
1663 mark_all_dquot_dirty(dquots
);
1664 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1665 flush_warnings(warn
);
1668 EXPORT_SYMBOL(dquot_alloc_inode
);
1671 * Convert in-memory reserved quotas to real consumed quotas
1673 int dquot_claim_space_nodirty(struct inode
*inode
, qsize_t number
)
1677 if (!dquot_active(inode
)) {
1678 inode_claim_rsv_space(inode
, number
);
1682 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1683 spin_lock(&dq_data_lock
);
1684 /* Claim reserved quotas to allocated quotas */
1685 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1686 if (inode
->i_dquot
[cnt
])
1687 dquot_claim_reserved_space(inode
->i_dquot
[cnt
],
1690 /* Update inode bytes */
1691 inode_claim_rsv_space(inode
, number
);
1692 spin_unlock(&dq_data_lock
);
1693 mark_all_dquot_dirty(inode
->i_dquot
);
1694 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1697 EXPORT_SYMBOL(dquot_claim_space_nodirty
);
1700 * This operation can block, but only after everything is updated
1702 void __dquot_free_space(struct inode
*inode
, qsize_t number
, int flags
)
1705 struct dquot_warn warn
[MAXQUOTAS
];
1706 struct dquot
**dquots
= inode
->i_dquot
;
1707 int reserve
= flags
& DQUOT_SPACE_RESERVE
;
1709 /* First test before acquiring mutex - solves deadlocks when we
1710 * re-enter the quota code and are already holding the mutex */
1711 if (!dquot_active(inode
)) {
1712 inode_decr_space(inode
, number
, reserve
);
1716 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1717 spin_lock(&dq_data_lock
);
1718 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1721 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1724 wtype
= info_bdq_free(dquots
[cnt
], number
);
1725 if (wtype
!= QUOTA_NL_NOWARN
)
1726 prepare_warning(&warn
[cnt
], dquots
[cnt
], wtype
);
1728 dquot_free_reserved_space(dquots
[cnt
], number
);
1730 dquot_decr_space(dquots
[cnt
], number
);
1732 inode_decr_space(inode
, number
, reserve
);
1733 spin_unlock(&dq_data_lock
);
1737 mark_all_dquot_dirty(dquots
);
1739 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1740 flush_warnings(warn
);
1742 EXPORT_SYMBOL(__dquot_free_space
);
1745 * This operation can block, but only after everything is updated
1747 void dquot_free_inode(const struct inode
*inode
)
1750 struct dquot_warn warn
[MAXQUOTAS
];
1751 struct dquot
* const *dquots
= inode
->i_dquot
;
1753 /* First test before acquiring mutex - solves deadlocks when we
1754 * re-enter the quota code and are already holding the mutex */
1755 if (!dquot_active(inode
))
1758 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1759 spin_lock(&dq_data_lock
);
1760 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1763 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1766 wtype
= info_idq_free(dquots
[cnt
], 1);
1767 if (wtype
!= QUOTA_NL_NOWARN
)
1768 prepare_warning(&warn
[cnt
], dquots
[cnt
], wtype
);
1769 dquot_decr_inodes(dquots
[cnt
], 1);
1771 spin_unlock(&dq_data_lock
);
1772 mark_all_dquot_dirty(dquots
);
1773 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1774 flush_warnings(warn
);
1776 EXPORT_SYMBOL(dquot_free_inode
);
1779 * Transfer the number of inode and blocks from one diskquota to an other.
1780 * On success, dquot references in transfer_to are consumed and references
1781 * to original dquots that need to be released are placed there. On failure,
1782 * references are kept untouched.
1784 * This operation can block, but only after everything is updated
1785 * A transaction must be started when entering this function.
1788 int __dquot_transfer(struct inode
*inode
, struct dquot
**transfer_to
)
1790 qsize_t space
, cur_space
;
1791 qsize_t rsv_space
= 0;
1792 struct dquot
*transfer_from
[MAXQUOTAS
] = {};
1794 char is_valid
[MAXQUOTAS
] = {};
1795 struct dquot_warn warn_to
[MAXQUOTAS
];
1796 struct dquot_warn warn_from_inodes
[MAXQUOTAS
];
1797 struct dquot_warn warn_from_space
[MAXQUOTAS
];
1799 /* First test before acquiring mutex - solves deadlocks when we
1800 * re-enter the quota code and are already holding the mutex */
1801 if (IS_NOQUOTA(inode
))
1803 /* Initialize the arrays */
1804 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1805 warn_to
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1806 warn_from_inodes
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1807 warn_from_space
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1809 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1810 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1811 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1814 spin_lock(&dq_data_lock
);
1815 cur_space
= inode_get_bytes(inode
);
1816 rsv_space
= inode_get_rsv_space(inode
);
1817 space
= cur_space
+ rsv_space
;
1818 /* Build the transfer_from list and check the limits */
1819 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1821 * Skip changes for same uid or gid or for turned off quota-type.
1823 if (!transfer_to
[cnt
])
1825 /* Avoid races with quotaoff() */
1826 if (!sb_has_quota_active(inode
->i_sb
, cnt
))
1829 transfer_from
[cnt
] = inode
->i_dquot
[cnt
];
1830 ret
= check_idq(transfer_to
[cnt
], 1, &warn_to
[cnt
]);
1833 ret
= check_bdq(transfer_to
[cnt
], space
, 0, &warn_to
[cnt
]);
1839 * Finally perform the needed transfer from transfer_from to transfer_to
1841 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1844 /* Due to IO error we might not have transfer_from[] structure */
1845 if (transfer_from
[cnt
]) {
1847 wtype
= info_idq_free(transfer_from
[cnt
], 1);
1848 if (wtype
!= QUOTA_NL_NOWARN
)
1849 prepare_warning(&warn_from_inodes
[cnt
],
1850 transfer_from
[cnt
], wtype
);
1851 wtype
= info_bdq_free(transfer_from
[cnt
], space
);
1852 if (wtype
!= QUOTA_NL_NOWARN
)
1853 prepare_warning(&warn_from_space
[cnt
],
1854 transfer_from
[cnt
], wtype
);
1855 dquot_decr_inodes(transfer_from
[cnt
], 1);
1856 dquot_decr_space(transfer_from
[cnt
], cur_space
);
1857 dquot_free_reserved_space(transfer_from
[cnt
],
1861 dquot_incr_inodes(transfer_to
[cnt
], 1);
1862 dquot_incr_space(transfer_to
[cnt
], cur_space
);
1863 dquot_resv_space(transfer_to
[cnt
], rsv_space
);
1865 inode
->i_dquot
[cnt
] = transfer_to
[cnt
];
1867 spin_unlock(&dq_data_lock
);
1868 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1870 mark_all_dquot_dirty(transfer_from
);
1871 mark_all_dquot_dirty(transfer_to
);
1872 flush_warnings(warn_to
);
1873 flush_warnings(warn_from_inodes
);
1874 flush_warnings(warn_from_space
);
1875 /* Pass back references to put */
1876 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1878 transfer_to
[cnt
] = transfer_from
[cnt
];
1881 spin_unlock(&dq_data_lock
);
1882 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1883 flush_warnings(warn_to
);
1886 EXPORT_SYMBOL(__dquot_transfer
);
1888 /* Wrapper for transferring ownership of an inode for uid/gid only
1889 * Called from FSXXX_setattr()
1891 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
1893 struct dquot
*transfer_to
[MAXQUOTAS
] = {};
1894 struct super_block
*sb
= inode
->i_sb
;
1897 if (!dquot_active(inode
))
1900 if (iattr
->ia_valid
& ATTR_UID
&& iattr
->ia_uid
!= inode
->i_uid
)
1901 transfer_to
[USRQUOTA
] = dqget(sb
, iattr
->ia_uid
, USRQUOTA
);
1902 if (iattr
->ia_valid
& ATTR_GID
&& iattr
->ia_gid
!= inode
->i_gid
)
1903 transfer_to
[GRPQUOTA
] = dqget(sb
, iattr
->ia_gid
, GRPQUOTA
);
1905 ret
= __dquot_transfer(inode
, transfer_to
);
1906 dqput_all(transfer_to
);
1909 EXPORT_SYMBOL(dquot_transfer
);
1912 * Write info of quota file to disk
1914 int dquot_commit_info(struct super_block
*sb
, int type
)
1917 struct quota_info
*dqopt
= sb_dqopt(sb
);
1919 mutex_lock(&dqopt
->dqio_mutex
);
1920 ret
= dqopt
->ops
[type
]->write_file_info(sb
, type
);
1921 mutex_unlock(&dqopt
->dqio_mutex
);
1924 EXPORT_SYMBOL(dquot_commit_info
);
1927 * Definitions of diskquota operations.
1929 const struct dquot_operations dquot_operations
= {
1930 .write_dquot
= dquot_commit
,
1931 .acquire_dquot
= dquot_acquire
,
1932 .release_dquot
= dquot_release
,
1933 .mark_dirty
= dquot_mark_dquot_dirty
,
1934 .write_info
= dquot_commit_info
,
1935 .alloc_dquot
= dquot_alloc
,
1936 .destroy_dquot
= dquot_destroy
,
1938 EXPORT_SYMBOL(dquot_operations
);
1941 * Generic helper for ->open on filesystems supporting disk quotas.
1943 int dquot_file_open(struct inode
*inode
, struct file
*file
)
1947 error
= generic_file_open(inode
, file
);
1948 if (!error
&& (file
->f_mode
& FMODE_WRITE
))
1949 dquot_initialize(inode
);
1952 EXPORT_SYMBOL(dquot_file_open
);
1955 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1957 int dquot_disable(struct super_block
*sb
, int type
, unsigned int flags
)
1960 struct quota_info
*dqopt
= sb_dqopt(sb
);
1961 struct inode
*toputinode
[MAXQUOTAS
];
1963 /* Cannot turn off usage accounting without turning off limits, or
1964 * suspend quotas and simultaneously turn quotas off. */
1965 if ((flags
& DQUOT_USAGE_ENABLED
&& !(flags
& DQUOT_LIMITS_ENABLED
))
1966 || (flags
& DQUOT_SUSPENDED
&& flags
& (DQUOT_LIMITS_ENABLED
|
1967 DQUOT_USAGE_ENABLED
)))
1970 /* We need to serialize quota_off() for device */
1971 mutex_lock(&dqopt
->dqonoff_mutex
);
1974 * Skip everything if there's nothing to do. We have to do this because
1975 * sometimes we are called when fill_super() failed and calling
1976 * sync_fs() in such cases does no good.
1978 if (!sb_any_quota_loaded(sb
)) {
1979 mutex_unlock(&dqopt
->dqonoff_mutex
);
1982 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1983 toputinode
[cnt
] = NULL
;
1984 if (type
!= -1 && cnt
!= type
)
1986 if (!sb_has_quota_loaded(sb
, cnt
))
1989 if (flags
& DQUOT_SUSPENDED
) {
1990 spin_lock(&dq_state_lock
);
1992 dquot_state_flag(DQUOT_SUSPENDED
, cnt
);
1993 spin_unlock(&dq_state_lock
);
1995 spin_lock(&dq_state_lock
);
1996 dqopt
->flags
&= ~dquot_state_flag(flags
, cnt
);
1997 /* Turning off suspended quotas? */
1998 if (!sb_has_quota_loaded(sb
, cnt
) &&
1999 sb_has_quota_suspended(sb
, cnt
)) {
2000 dqopt
->flags
&= ~dquot_state_flag(
2001 DQUOT_SUSPENDED
, cnt
);
2002 spin_unlock(&dq_state_lock
);
2003 iput(dqopt
->files
[cnt
]);
2004 dqopt
->files
[cnt
] = NULL
;
2007 spin_unlock(&dq_state_lock
);
2010 /* We still have to keep quota loaded? */
2011 if (sb_has_quota_loaded(sb
, cnt
) && !(flags
& DQUOT_SUSPENDED
))
2014 /* Note: these are blocking operations */
2015 drop_dquot_ref(sb
, cnt
);
2016 invalidate_dquots(sb
, cnt
);
2018 * Now all dquots should be invalidated, all writes done so we
2019 * should be only users of the info. No locks needed.
2021 if (info_dirty(&dqopt
->info
[cnt
]))
2022 sb
->dq_op
->write_info(sb
, cnt
);
2023 if (dqopt
->ops
[cnt
]->free_file_info
)
2024 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
2025 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
2027 toputinode
[cnt
] = dqopt
->files
[cnt
];
2028 if (!sb_has_quota_loaded(sb
, cnt
))
2029 dqopt
->files
[cnt
] = NULL
;
2030 dqopt
->info
[cnt
].dqi_flags
= 0;
2031 dqopt
->info
[cnt
].dqi_igrace
= 0;
2032 dqopt
->info
[cnt
].dqi_bgrace
= 0;
2033 dqopt
->ops
[cnt
] = NULL
;
2035 mutex_unlock(&dqopt
->dqonoff_mutex
);
2037 /* Skip syncing and setting flags if quota files are hidden */
2038 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
2041 /* Sync the superblock so that buffers with quota data are written to
2042 * disk (and so userspace sees correct data afterwards). */
2043 if (sb
->s_op
->sync_fs
)
2044 sb
->s_op
->sync_fs(sb
, 1);
2045 sync_blockdev(sb
->s_bdev
);
2046 /* Now the quota files are just ordinary files and we can set the
2047 * inode flags back. Moreover we discard the pagecache so that
2048 * userspace sees the writes we did bypassing the pagecache. We
2049 * must also discard the blockdev buffers so that we see the
2050 * changes done by userspace on the next quotaon() */
2051 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2052 if (toputinode
[cnt
]) {
2053 mutex_lock(&dqopt
->dqonoff_mutex
);
2054 /* If quota was reenabled in the meantime, we have
2056 if (!sb_has_quota_loaded(sb
, cnt
)) {
2057 mutex_lock(&toputinode
[cnt
]->i_mutex
);
2058 toputinode
[cnt
]->i_flags
&= ~(S_IMMUTABLE
|
2059 S_NOATIME
| S_NOQUOTA
);
2060 truncate_inode_pages(&toputinode
[cnt
]->i_data
,
2062 mutex_unlock(&toputinode
[cnt
]->i_mutex
);
2063 mark_inode_dirty_sync(toputinode
[cnt
]);
2065 mutex_unlock(&dqopt
->dqonoff_mutex
);
2068 invalidate_bdev(sb
->s_bdev
);
2070 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2071 if (toputinode
[cnt
]) {
2072 /* On remount RO, we keep the inode pointer so that we
2073 * can reenable quota on the subsequent remount RW. We
2074 * have to check 'flags' variable and not use sb_has_
2075 * function because another quotaon / quotaoff could
2076 * change global state before we got here. We refuse
2077 * to suspend quotas when there is pending delete on
2078 * the quota file... */
2079 if (!(flags
& DQUOT_SUSPENDED
))
2080 iput(toputinode
[cnt
]);
2081 else if (!toputinode
[cnt
]->i_nlink
)
2086 EXPORT_SYMBOL(dquot_disable
);
2088 int dquot_quota_off(struct super_block
*sb
, int type
)
2090 return dquot_disable(sb
, type
,
2091 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2093 EXPORT_SYMBOL(dquot_quota_off
);
2096 * Turn quotas on on a device
2100 * Helper function to turn quotas on when we already have the inode of
2101 * quota file and no quota information is loaded.
2103 static int vfs_load_quota_inode(struct inode
*inode
, int type
, int format_id
,
2106 struct quota_format_type
*fmt
= find_quota_format(format_id
);
2107 struct super_block
*sb
= inode
->i_sb
;
2108 struct quota_info
*dqopt
= sb_dqopt(sb
);
2114 if (!S_ISREG(inode
->i_mode
)) {
2118 if (IS_RDONLY(inode
)) {
2122 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
) {
2126 /* Usage always has to be set... */
2127 if (!(flags
& DQUOT_USAGE_ENABLED
)) {
2132 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2133 /* As we bypass the pagecache we must now flush all the
2134 * dirty data and invalidate caches so that kernel sees
2135 * changes from userspace. It is not enough to just flush
2136 * the quota file since if blocksize < pagesize, invalidation
2137 * of the cache could fail because of other unrelated dirty
2139 sync_filesystem(sb
);
2140 invalidate_bdev(sb
->s_bdev
);
2142 mutex_lock(&dqopt
->dqonoff_mutex
);
2143 if (sb_has_quota_loaded(sb
, type
)) {
2148 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2149 /* We don't want quota and atime on quota files (deadlocks
2150 * possible) Also nobody should write to the file - we use
2151 * special IO operations which ignore the immutable bit. */
2152 mutex_lock(&inode
->i_mutex
);
2153 oldflags
= inode
->i_flags
& (S_NOATIME
| S_IMMUTABLE
|
2155 inode
->i_flags
|= S_NOQUOTA
| S_NOATIME
| S_IMMUTABLE
;
2156 mutex_unlock(&inode
->i_mutex
);
2158 * When S_NOQUOTA is set, remove dquot references as no more
2159 * references can be added
2161 __dquot_drop(inode
);
2165 dqopt
->files
[type
] = igrab(inode
);
2166 if (!dqopt
->files
[type
])
2169 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
2172 dqopt
->ops
[type
] = fmt
->qf_ops
;
2173 dqopt
->info
[type
].dqi_format
= fmt
;
2174 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
2175 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
2176 mutex_lock(&dqopt
->dqio_mutex
);
2177 error
= dqopt
->ops
[type
]->read_file_info(sb
, type
);
2179 mutex_unlock(&dqopt
->dqio_mutex
);
2182 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
2183 dqopt
->info
[type
].dqi_flags
|= DQF_SYS_FILE
;
2184 mutex_unlock(&dqopt
->dqio_mutex
);
2185 spin_lock(&dq_state_lock
);
2186 dqopt
->flags
|= dquot_state_flag(flags
, type
);
2187 spin_unlock(&dq_state_lock
);
2189 add_dquot_ref(sb
, type
);
2190 mutex_unlock(&dqopt
->dqonoff_mutex
);
2195 dqopt
->files
[type
] = NULL
;
2198 if (oldflags
!= -1) {
2199 mutex_lock(&inode
->i_mutex
);
2200 /* Set the flags back (in the case of accidental quotaon()
2201 * on a wrong file we don't want to mess up the flags) */
2202 inode
->i_flags
&= ~(S_NOATIME
| S_NOQUOTA
| S_IMMUTABLE
);
2203 inode
->i_flags
|= oldflags
;
2204 mutex_unlock(&inode
->i_mutex
);
2206 mutex_unlock(&dqopt
->dqonoff_mutex
);
2208 put_quota_format(fmt
);
2213 /* Reenable quotas on remount RW */
2214 int dquot_resume(struct super_block
*sb
, int type
)
2216 struct quota_info
*dqopt
= sb_dqopt(sb
);
2217 struct inode
*inode
;
2221 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2222 if (type
!= -1 && cnt
!= type
)
2225 mutex_lock(&dqopt
->dqonoff_mutex
);
2226 if (!sb_has_quota_suspended(sb
, cnt
)) {
2227 mutex_unlock(&dqopt
->dqonoff_mutex
);
2230 inode
= dqopt
->files
[cnt
];
2231 dqopt
->files
[cnt
] = NULL
;
2232 spin_lock(&dq_state_lock
);
2233 flags
= dqopt
->flags
& dquot_state_flag(DQUOT_USAGE_ENABLED
|
2234 DQUOT_LIMITS_ENABLED
,
2236 dqopt
->flags
&= ~dquot_state_flag(DQUOT_STATE_FLAGS
, cnt
);
2237 spin_unlock(&dq_state_lock
);
2238 mutex_unlock(&dqopt
->dqonoff_mutex
);
2240 flags
= dquot_generic_flag(flags
, cnt
);
2241 ret
= vfs_load_quota_inode(inode
, cnt
,
2242 dqopt
->info
[cnt
].dqi_fmt_id
, flags
);
2248 EXPORT_SYMBOL(dquot_resume
);
2250 int dquot_quota_on(struct super_block
*sb
, int type
, int format_id
,
2253 int error
= security_quota_on(path
->dentry
);
2256 /* Quota file not on the same filesystem? */
2257 if (path
->dentry
->d_sb
!= sb
)
2260 error
= vfs_load_quota_inode(path
->dentry
->d_inode
, type
,
2261 format_id
, DQUOT_USAGE_ENABLED
|
2262 DQUOT_LIMITS_ENABLED
);
2265 EXPORT_SYMBOL(dquot_quota_on
);
2268 * More powerful function for turning on quotas allowing setting
2269 * of individual quota flags
2271 int dquot_enable(struct inode
*inode
, int type
, int format_id
,
2275 struct super_block
*sb
= inode
->i_sb
;
2276 struct quota_info
*dqopt
= sb_dqopt(sb
);
2278 /* Just unsuspend quotas? */
2279 BUG_ON(flags
& DQUOT_SUSPENDED
);
2283 /* Just updating flags needed? */
2284 if (sb_has_quota_loaded(sb
, type
)) {
2285 mutex_lock(&dqopt
->dqonoff_mutex
);
2286 /* Now do a reliable test... */
2287 if (!sb_has_quota_loaded(sb
, type
)) {
2288 mutex_unlock(&dqopt
->dqonoff_mutex
);
2291 if (flags
& DQUOT_USAGE_ENABLED
&&
2292 sb_has_quota_usage_enabled(sb
, type
)) {
2296 if (flags
& DQUOT_LIMITS_ENABLED
&&
2297 sb_has_quota_limits_enabled(sb
, type
)) {
2301 spin_lock(&dq_state_lock
);
2302 sb_dqopt(sb
)->flags
|= dquot_state_flag(flags
, type
);
2303 spin_unlock(&dq_state_lock
);
2305 mutex_unlock(&dqopt
->dqonoff_mutex
);
2310 return vfs_load_quota_inode(inode
, type
, format_id
, flags
);
2312 EXPORT_SYMBOL(dquot_enable
);
2315 * This function is used when filesystem needs to initialize quotas
2316 * during mount time.
2318 int dquot_quota_on_mount(struct super_block
*sb
, char *qf_name
,
2319 int format_id
, int type
)
2321 struct dentry
*dentry
;
2324 mutex_lock(&sb
->s_root
->d_inode
->i_mutex
);
2325 dentry
= lookup_one_len(qf_name
, sb
->s_root
, strlen(qf_name
));
2326 mutex_unlock(&sb
->s_root
->d_inode
->i_mutex
);
2328 return PTR_ERR(dentry
);
2330 if (!dentry
->d_inode
) {
2335 error
= security_quota_on(dentry
);
2337 error
= vfs_load_quota_inode(dentry
->d_inode
, type
, format_id
,
2338 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2344 EXPORT_SYMBOL(dquot_quota_on_mount
);
2346 static inline qsize_t
qbtos(qsize_t blocks
)
2348 return blocks
<< QIF_DQBLKSIZE_BITS
;
2351 static inline qsize_t
stoqb(qsize_t space
)
2353 return (space
+ QIF_DQBLKSIZE
- 1) >> QIF_DQBLKSIZE_BITS
;
2356 /* Generic routine for getting common part of quota structure */
2357 static void do_get_dqblk(struct dquot
*dquot
, struct fs_disk_quota
*di
)
2359 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2361 memset(di
, 0, sizeof(*di
));
2362 di
->d_version
= FS_DQUOT_VERSION
;
2363 di
->d_flags
= dquot
->dq_type
== USRQUOTA
?
2364 FS_USER_QUOTA
: FS_GROUP_QUOTA
;
2365 di
->d_id
= dquot
->dq_id
;
2367 spin_lock(&dq_data_lock
);
2368 di
->d_blk_hardlimit
= stoqb(dm
->dqb_bhardlimit
);
2369 di
->d_blk_softlimit
= stoqb(dm
->dqb_bsoftlimit
);
2370 di
->d_ino_hardlimit
= dm
->dqb_ihardlimit
;
2371 di
->d_ino_softlimit
= dm
->dqb_isoftlimit
;
2372 di
->d_bcount
= dm
->dqb_curspace
+ dm
->dqb_rsvspace
;
2373 di
->d_icount
= dm
->dqb_curinodes
;
2374 di
->d_btimer
= dm
->dqb_btime
;
2375 di
->d_itimer
= dm
->dqb_itime
;
2376 spin_unlock(&dq_data_lock
);
2379 int dquot_get_dqblk(struct super_block
*sb
, int type
, qid_t id
,
2380 struct fs_disk_quota
*di
)
2382 struct dquot
*dquot
;
2384 dquot
= dqget(sb
, id
, type
);
2387 do_get_dqblk(dquot
, di
);
2392 EXPORT_SYMBOL(dquot_get_dqblk
);
2394 #define VFS_FS_DQ_MASK \
2395 (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \
2396 FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \
2397 FS_DQ_BTIMER | FS_DQ_ITIMER)
2399 /* Generic routine for setting common part of quota structure */
2400 static int do_set_dqblk(struct dquot
*dquot
, struct fs_disk_quota
*di
)
2402 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2403 int check_blim
= 0, check_ilim
= 0;
2404 struct mem_dqinfo
*dqi
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
2406 if (di
->d_fieldmask
& ~VFS_FS_DQ_MASK
)
2409 if (((di
->d_fieldmask
& FS_DQ_BSOFT
) &&
2410 (di
->d_blk_softlimit
> dqi
->dqi_maxblimit
)) ||
2411 ((di
->d_fieldmask
& FS_DQ_BHARD
) &&
2412 (di
->d_blk_hardlimit
> dqi
->dqi_maxblimit
)) ||
2413 ((di
->d_fieldmask
& FS_DQ_ISOFT
) &&
2414 (di
->d_ino_softlimit
> dqi
->dqi_maxilimit
)) ||
2415 ((di
->d_fieldmask
& FS_DQ_IHARD
) &&
2416 (di
->d_ino_hardlimit
> dqi
->dqi_maxilimit
)))
2419 spin_lock(&dq_data_lock
);
2420 if (di
->d_fieldmask
& FS_DQ_BCOUNT
) {
2421 dm
->dqb_curspace
= di
->d_bcount
- dm
->dqb_rsvspace
;
2423 set_bit(DQ_LASTSET_B
+ QIF_SPACE_B
, &dquot
->dq_flags
);
2426 if (di
->d_fieldmask
& FS_DQ_BSOFT
)
2427 dm
->dqb_bsoftlimit
= qbtos(di
->d_blk_softlimit
);
2428 if (di
->d_fieldmask
& FS_DQ_BHARD
)
2429 dm
->dqb_bhardlimit
= qbtos(di
->d_blk_hardlimit
);
2430 if (di
->d_fieldmask
& (FS_DQ_BSOFT
| FS_DQ_BHARD
)) {
2432 set_bit(DQ_LASTSET_B
+ QIF_BLIMITS_B
, &dquot
->dq_flags
);
2435 if (di
->d_fieldmask
& FS_DQ_ICOUNT
) {
2436 dm
->dqb_curinodes
= di
->d_icount
;
2438 set_bit(DQ_LASTSET_B
+ QIF_INODES_B
, &dquot
->dq_flags
);
2441 if (di
->d_fieldmask
& FS_DQ_ISOFT
)
2442 dm
->dqb_isoftlimit
= di
->d_ino_softlimit
;
2443 if (di
->d_fieldmask
& FS_DQ_IHARD
)
2444 dm
->dqb_ihardlimit
= di
->d_ino_hardlimit
;
2445 if (di
->d_fieldmask
& (FS_DQ_ISOFT
| FS_DQ_IHARD
)) {
2447 set_bit(DQ_LASTSET_B
+ QIF_ILIMITS_B
, &dquot
->dq_flags
);
2450 if (di
->d_fieldmask
& FS_DQ_BTIMER
) {
2451 dm
->dqb_btime
= di
->d_btimer
;
2453 set_bit(DQ_LASTSET_B
+ QIF_BTIME_B
, &dquot
->dq_flags
);
2456 if (di
->d_fieldmask
& FS_DQ_ITIMER
) {
2457 dm
->dqb_itime
= di
->d_itimer
;
2459 set_bit(DQ_LASTSET_B
+ QIF_ITIME_B
, &dquot
->dq_flags
);
2463 if (!dm
->dqb_bsoftlimit
||
2464 dm
->dqb_curspace
< dm
->dqb_bsoftlimit
) {
2466 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
2467 } else if (!(di
->d_fieldmask
& FS_DQ_BTIMER
))
2468 /* Set grace only if user hasn't provided his own... */
2469 dm
->dqb_btime
= get_seconds() + dqi
->dqi_bgrace
;
2472 if (!dm
->dqb_isoftlimit
||
2473 dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
2475 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
2476 } else if (!(di
->d_fieldmask
& FS_DQ_ITIMER
))
2477 /* Set grace only if user hasn't provided his own... */
2478 dm
->dqb_itime
= get_seconds() + dqi
->dqi_igrace
;
2480 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
||
2482 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2484 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2485 spin_unlock(&dq_data_lock
);
2486 mark_dquot_dirty(dquot
);
2491 int dquot_set_dqblk(struct super_block
*sb
, int type
, qid_t id
,
2492 struct fs_disk_quota
*di
)
2494 struct dquot
*dquot
;
2497 dquot
= dqget(sb
, id
, type
);
2502 rc
= do_set_dqblk(dquot
, di
);
2507 EXPORT_SYMBOL(dquot_set_dqblk
);
2509 /* Generic routine for getting common part of quota file information */
2510 int dquot_get_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2512 struct mem_dqinfo
*mi
;
2514 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2515 if (!sb_has_quota_active(sb
, type
)) {
2516 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2519 mi
= sb_dqopt(sb
)->info
+ type
;
2520 spin_lock(&dq_data_lock
);
2521 ii
->dqi_bgrace
= mi
->dqi_bgrace
;
2522 ii
->dqi_igrace
= mi
->dqi_igrace
;
2523 ii
->dqi_flags
= mi
->dqi_flags
& DQF_GETINFO_MASK
;
2524 ii
->dqi_valid
= IIF_ALL
;
2525 spin_unlock(&dq_data_lock
);
2526 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2529 EXPORT_SYMBOL(dquot_get_dqinfo
);
2531 /* Generic routine for setting common part of quota file information */
2532 int dquot_set_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2534 struct mem_dqinfo
*mi
;
2537 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2538 if (!sb_has_quota_active(sb
, type
)) {
2542 mi
= sb_dqopt(sb
)->info
+ type
;
2543 spin_lock(&dq_data_lock
);
2544 if (ii
->dqi_valid
& IIF_BGRACE
)
2545 mi
->dqi_bgrace
= ii
->dqi_bgrace
;
2546 if (ii
->dqi_valid
& IIF_IGRACE
)
2547 mi
->dqi_igrace
= ii
->dqi_igrace
;
2548 if (ii
->dqi_valid
& IIF_FLAGS
)
2549 mi
->dqi_flags
= (mi
->dqi_flags
& ~DQF_SETINFO_MASK
) |
2550 (ii
->dqi_flags
& DQF_SETINFO_MASK
);
2551 spin_unlock(&dq_data_lock
);
2552 mark_info_dirty(sb
, type
);
2553 /* Force write to disk */
2554 sb
->dq_op
->write_info(sb
, type
);
2556 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2559 EXPORT_SYMBOL(dquot_set_dqinfo
);
2561 const struct quotactl_ops dquot_quotactl_ops
= {
2562 .quota_on
= dquot_quota_on
,
2563 .quota_off
= dquot_quota_off
,
2564 .quota_sync
= dquot_quota_sync
,
2565 .get_info
= dquot_get_dqinfo
,
2566 .set_info
= dquot_set_dqinfo
,
2567 .get_dqblk
= dquot_get_dqblk
,
2568 .set_dqblk
= dquot_set_dqblk
2570 EXPORT_SYMBOL(dquot_quotactl_ops
);
2572 static int do_proc_dqstats(struct ctl_table
*table
, int write
,
2573 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2575 unsigned int type
= (int *)table
->data
- dqstats
.stat
;
2577 /* Update global table */
2578 dqstats
.stat
[type
] =
2579 percpu_counter_sum_positive(&dqstats
.counter
[type
]);
2580 return proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
2583 static ctl_table fs_dqstats_table
[] = {
2585 .procname
= "lookups",
2586 .data
= &dqstats
.stat
[DQST_LOOKUPS
],
2587 .maxlen
= sizeof(int),
2589 .proc_handler
= do_proc_dqstats
,
2592 .procname
= "drops",
2593 .data
= &dqstats
.stat
[DQST_DROPS
],
2594 .maxlen
= sizeof(int),
2596 .proc_handler
= do_proc_dqstats
,
2599 .procname
= "reads",
2600 .data
= &dqstats
.stat
[DQST_READS
],
2601 .maxlen
= sizeof(int),
2603 .proc_handler
= do_proc_dqstats
,
2606 .procname
= "writes",
2607 .data
= &dqstats
.stat
[DQST_WRITES
],
2608 .maxlen
= sizeof(int),
2610 .proc_handler
= do_proc_dqstats
,
2613 .procname
= "cache_hits",
2614 .data
= &dqstats
.stat
[DQST_CACHE_HITS
],
2615 .maxlen
= sizeof(int),
2617 .proc_handler
= do_proc_dqstats
,
2620 .procname
= "allocated_dquots",
2621 .data
= &dqstats
.stat
[DQST_ALLOC_DQUOTS
],
2622 .maxlen
= sizeof(int),
2624 .proc_handler
= do_proc_dqstats
,
2627 .procname
= "free_dquots",
2628 .data
= &dqstats
.stat
[DQST_FREE_DQUOTS
],
2629 .maxlen
= sizeof(int),
2631 .proc_handler
= do_proc_dqstats
,
2634 .procname
= "syncs",
2635 .data
= &dqstats
.stat
[DQST_SYNCS
],
2636 .maxlen
= sizeof(int),
2638 .proc_handler
= do_proc_dqstats
,
2640 #ifdef CONFIG_PRINT_QUOTA_WARNING
2642 .procname
= "warnings",
2643 .data
= &flag_print_warnings
,
2644 .maxlen
= sizeof(int),
2646 .proc_handler
= proc_dointvec
,
2652 static ctl_table fs_table
[] = {
2654 .procname
= "quota",
2656 .child
= fs_dqstats_table
,
2661 static ctl_table sys_table
[] = {
2670 static int __init
dquot_init(void)
2673 unsigned long nr_hash
, order
;
2675 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2677 register_sysctl_table(sys_table
);
2679 dquot_cachep
= kmem_cache_create("dquot",
2680 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2681 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2682 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2686 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
2688 panic("Cannot create dquot hash table");
2690 for (i
= 0; i
< _DQST_DQSTAT_LAST
; i
++) {
2691 ret
= percpu_counter_init(&dqstats
.counter
[i
], 0);
2693 panic("Cannot create dquot stat counters");
2696 /* Find power-of-two hlist_heads which can fit into allocation */
2697 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2701 } while (nr_hash
>> dq_hash_bits
);
2704 nr_hash
= 1UL << dq_hash_bits
;
2705 dq_hash_mask
= nr_hash
- 1;
2706 for (i
= 0; i
< nr_hash
; i
++)
2707 INIT_HLIST_HEAD(dquot_hash
+ i
);
2709 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2710 nr_hash
, order
, (PAGE_SIZE
<< order
));
2712 register_shrinker(&dqcache_shrinker
);
2716 module_init(dquot_init
);