2 * Implementation of the diskquota system for the LINUX operating system. QUOTA
3 * is implemented using the BSD system call interface as the means of
4 * communication with the user level. This file contains the generic routines
5 * called by the different filesystems on allocation of an inode or block.
6 * These routines take care of the administration needed to have a consistent
7 * diskquota tracking system. The ideas of both user and group quotas are based
8 * on the Melbourne quota system as used on BSD derived systems. The internal
9 * implementation is based on one of the several variants of the LINUX
10 * inode-subsystem with added complexity of the diskquota system.
12 * Author: Marco van Wieringen <mvw@planets.elm.net>
14 * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
16 * Revised list management to avoid races
17 * -- Bill Hawes, <whawes@star.net>, 9/98
19 * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
20 * As the consequence the locking was moved from dquot_decr_...(),
21 * dquot_incr_...() to calling functions.
22 * invalidate_dquots() now writes modified dquots.
23 * Serialized quota_off() and quota_on() for mount point.
24 * Fixed a few bugs in grow_dquots().
25 * Fixed deadlock in write_dquot() - we no longer account quotas on
27 * remove_dquot_ref() moved to inode.c - it now traverses through inodes
28 * add_dquot_ref() restarts after blocking
29 * Added check for bogus uid and fixed check for group in quotactl.
30 * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
32 * Used struct list_head instead of own list struct
33 * Invalidation of referenced dquots is no longer possible
34 * Improved free_dquots list management
35 * Quota and i_blocks are now updated in one place to avoid races
36 * Warnings are now delayed so we won't block in critical section
37 * Write updated not to require dquot lock
38 * Jan Kara, <jack@suse.cz>, 9/2000
40 * Added dynamic quota structure allocation
41 * Jan Kara <jack@suse.cz> 12/2000
43 * Rewritten quota interface. Implemented new quota format and
44 * formats registering.
45 * Jan Kara, <jack@suse.cz>, 2001,2002
48 * Jan Kara, <jack@suse.cz>, 10/2002
50 * Added journalled quota support, fix lock inversion problems
51 * Jan Kara, <jack@suse.cz>, 2003,2004
53 * (C) Copyright 1994 - 1997 Marco van Wieringen
56 #include <linux/errno.h>
57 #include <linux/kernel.h>
59 #include <linux/mount.h>
61 #include <linux/time.h>
62 #include <linux/types.h>
63 #include <linux/string.h>
64 #include <linux/fcntl.h>
65 #include <linux/stat.h>
66 #include <linux/tty.h>
67 #include <linux/file.h>
68 #include <linux/slab.h>
69 #include <linux/sysctl.h>
70 #include <linux/init.h>
71 #include <linux/module.h>
72 #include <linux/proc_fs.h>
73 #include <linux/security.h>
74 #include <linux/kmod.h>
75 #include <linux/namei.h>
76 #include <linux/buffer_head.h>
77 #include <linux/capability.h>
78 #include <linux/quotaops.h>
79 #include <linux/writeback.h> /* for inode_lock, oddly enough.. */
81 #include <asm/uaccess.h>
83 #define __DQUOT_PARANOIA
86 * There are three quota SMP locks. dq_list_lock protects all lists with quotas
87 * and quota formats, dqstats structure containing statistics about the lists
88 * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
89 * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
90 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
91 * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
92 * modifications of quota state (on quotaon and quotaoff) and readers who care
93 * about latest values take it as well.
95 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
96 * dq_list_lock > dq_state_lock
98 * Note that some things (eg. sb pointer, type, id) doesn't change during
99 * the life of the dquot structure and so needn't to be protected by a lock
101 * Any operation working on dquots via inode pointers must hold dqptr_sem. If
102 * operation is just reading pointers from inode (or not using them at all) the
103 * read lock is enough. If pointers are altered function must hold write lock.
104 * Special care needs to be taken about S_NOQUOTA inode flag (marking that
105 * inode is a quota file). Functions adding pointers from inode to dquots have
106 * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they
107 * have to do all pointer modifications before dropping dqptr_sem. This makes
108 * sure they cannot race with quotaon which first sets S_NOQUOTA flag and
109 * then drops all pointers to dquots from an inode.
111 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
112 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
113 * Currently dquot is locked only when it is being read to memory (or space for
114 * it is being allocated) on the first dqget() and when it is being released on
115 * the last dqput(). The allocation and release oparations are serialized by
116 * the dq_lock and by checking the use count in dquot_release(). Write
117 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
118 * spinlock to internal buffers before writing.
120 * Lock ordering (including related VFS locks) is the following:
121 * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
123 * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
124 * dqptr_sem. But filesystem has to count with the fact that functions such as
125 * dquot_alloc_space() acquire dqptr_sem and they usually have to be called
126 * from inside a transaction to keep filesystem consistency after a crash. Also
127 * filesystems usually want to do some IO on dquot from ->mark_dirty which is
128 * called with dqptr_sem held.
129 * i_mutex on quota files is special (it's below dqio_mutex)
132 static __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_list_lock
);
133 static __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_state_lock
);
134 __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_data_lock
);
135 EXPORT_SYMBOL(dq_data_lock
);
137 static char *quotatypes
[] = INITQFNAMES
;
138 static struct quota_format_type
*quota_formats
; /* List of registered formats */
139 static struct quota_module_name module_names
[] = INIT_QUOTA_MODULE_NAMES
;
141 /* SLAB cache for dquot structures */
142 static struct kmem_cache
*dquot_cachep
;
144 int register_quota_format(struct quota_format_type
*fmt
)
146 spin_lock(&dq_list_lock
);
147 fmt
->qf_next
= quota_formats
;
149 spin_unlock(&dq_list_lock
);
152 EXPORT_SYMBOL(register_quota_format
);
154 void unregister_quota_format(struct quota_format_type
*fmt
)
156 struct quota_format_type
**actqf
;
158 spin_lock(&dq_list_lock
);
159 for (actqf
= "a_formats
; *actqf
&& *actqf
!= fmt
;
160 actqf
= &(*actqf
)->qf_next
)
163 *actqf
= (*actqf
)->qf_next
;
164 spin_unlock(&dq_list_lock
);
166 EXPORT_SYMBOL(unregister_quota_format
);
168 static struct quota_format_type
*find_quota_format(int id
)
170 struct quota_format_type
*actqf
;
172 spin_lock(&dq_list_lock
);
173 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
174 actqf
= actqf
->qf_next
)
176 if (!actqf
|| !try_module_get(actqf
->qf_owner
)) {
179 spin_unlock(&dq_list_lock
);
181 for (qm
= 0; module_names
[qm
].qm_fmt_id
&&
182 module_names
[qm
].qm_fmt_id
!= id
; qm
++)
184 if (!module_names
[qm
].qm_fmt_id
||
185 request_module(module_names
[qm
].qm_mod_name
))
188 spin_lock(&dq_list_lock
);
189 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
190 actqf
= actqf
->qf_next
)
192 if (actqf
&& !try_module_get(actqf
->qf_owner
))
195 spin_unlock(&dq_list_lock
);
199 static void put_quota_format(struct quota_format_type
*fmt
)
201 module_put(fmt
->qf_owner
);
205 * Dquot List Management:
206 * The quota code uses three lists for dquot management: the inuse_list,
207 * free_dquots, and dquot_hash[] array. A single dquot structure may be
208 * on all three lists, depending on its current state.
210 * All dquots are placed to the end of inuse_list when first created, and this
211 * list is used for invalidate operation, which must look at every dquot.
213 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
214 * and this list is searched whenever we need an available dquot. Dquots are
215 * removed from the list as soon as they are used again, and
216 * dqstats.free_dquots gives the number of dquots on the list. When
217 * dquot is invalidated it's completely released from memory.
219 * Dquots with a specific identity (device, type and id) are placed on
220 * one of the dquot_hash[] hash chains. The provides an efficient search
221 * mechanism to locate a specific dquot.
224 static LIST_HEAD(inuse_list
);
225 static LIST_HEAD(free_dquots
);
226 static unsigned int dq_hash_bits
, dq_hash_mask
;
227 static struct hlist_head
*dquot_hash
;
229 struct dqstats dqstats
;
230 EXPORT_SYMBOL(dqstats
);
232 static qsize_t
inode_get_rsv_space(struct inode
*inode
);
233 static void __dquot_initialize(struct inode
*inode
, int type
);
235 static inline unsigned int
236 hashfn(const struct super_block
*sb
, unsigned int id
, int type
)
240 tmp
= (((unsigned long)sb
>>L1_CACHE_SHIFT
) ^ id
) * (MAXQUOTAS
- type
);
241 return (tmp
+ (tmp
>> dq_hash_bits
)) & dq_hash_mask
;
245 * Following list functions expect dq_list_lock to be held
247 static inline void insert_dquot_hash(struct dquot
*dquot
)
249 struct hlist_head
*head
;
250 head
= dquot_hash
+ hashfn(dquot
->dq_sb
, dquot
->dq_id
, dquot
->dq_type
);
251 hlist_add_head(&dquot
->dq_hash
, head
);
254 static inline void remove_dquot_hash(struct dquot
*dquot
)
256 hlist_del_init(&dquot
->dq_hash
);
259 static struct dquot
*find_dquot(unsigned int hashent
, struct super_block
*sb
,
260 unsigned int id
, int type
)
262 struct hlist_node
*node
;
265 hlist_for_each (node
, dquot_hash
+hashent
) {
266 dquot
= hlist_entry(node
, struct dquot
, dq_hash
);
267 if (dquot
->dq_sb
== sb
&& dquot
->dq_id
== id
&&
268 dquot
->dq_type
== type
)
274 /* Add a dquot to the tail of the free list */
275 static inline void put_dquot_last(struct dquot
*dquot
)
277 list_add_tail(&dquot
->dq_free
, &free_dquots
);
278 dqstats
.free_dquots
++;
281 static inline void remove_free_dquot(struct dquot
*dquot
)
283 if (list_empty(&dquot
->dq_free
))
285 list_del_init(&dquot
->dq_free
);
286 dqstats
.free_dquots
--;
289 static inline void put_inuse(struct dquot
*dquot
)
291 /* We add to the back of inuse list so we don't have to restart
292 * when traversing this list and we block */
293 list_add_tail(&dquot
->dq_inuse
, &inuse_list
);
294 dqstats
.allocated_dquots
++;
297 static inline void remove_inuse(struct dquot
*dquot
)
299 dqstats
.allocated_dquots
--;
300 list_del(&dquot
->dq_inuse
);
303 * End of list functions needing dq_list_lock
306 static void wait_on_dquot(struct dquot
*dquot
)
308 mutex_lock(&dquot
->dq_lock
);
309 mutex_unlock(&dquot
->dq_lock
);
312 static inline int dquot_dirty(struct dquot
*dquot
)
314 return test_bit(DQ_MOD_B
, &dquot
->dq_flags
);
317 static inline int mark_dquot_dirty(struct dquot
*dquot
)
319 return dquot
->dq_sb
->dq_op
->mark_dirty(dquot
);
322 int dquot_mark_dquot_dirty(struct dquot
*dquot
)
324 spin_lock(&dq_list_lock
);
325 if (!test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
))
326 list_add(&dquot
->dq_dirty
, &sb_dqopt(dquot
->dq_sb
)->
327 info
[dquot
->dq_type
].dqi_dirty_list
);
328 spin_unlock(&dq_list_lock
);
331 EXPORT_SYMBOL(dquot_mark_dquot_dirty
);
333 /* Dirtify all the dquots - this can block when journalling */
334 static inline int mark_all_dquot_dirty(struct dquot
* const *dquot
)
339 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
341 /* Even in case of error we have to continue */
342 ret
= mark_dquot_dirty(dquot
[cnt
]);
349 static inline void dqput_all(struct dquot
**dquot
)
353 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
357 /* This function needs dq_list_lock */
358 static inline int clear_dquot_dirty(struct dquot
*dquot
)
360 if (!test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
))
362 list_del_init(&dquot
->dq_dirty
);
366 void mark_info_dirty(struct super_block
*sb
, int type
)
368 set_bit(DQF_INFO_DIRTY_B
, &sb_dqopt(sb
)->info
[type
].dqi_flags
);
370 EXPORT_SYMBOL(mark_info_dirty
);
373 * Read dquot from disk and alloc space for it
376 int dquot_acquire(struct dquot
*dquot
)
378 int ret
= 0, ret2
= 0;
379 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
381 mutex_lock(&dquot
->dq_lock
);
382 mutex_lock(&dqopt
->dqio_mutex
);
383 if (!test_bit(DQ_READ_B
, &dquot
->dq_flags
))
384 ret
= dqopt
->ops
[dquot
->dq_type
]->read_dqblk(dquot
);
387 set_bit(DQ_READ_B
, &dquot
->dq_flags
);
388 /* Instantiate dquot if needed */
389 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && !dquot
->dq_off
) {
390 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
391 /* Write the info if needed */
392 if (info_dirty(&dqopt
->info
[dquot
->dq_type
])) {
393 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(
394 dquot
->dq_sb
, dquot
->dq_type
);
403 set_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
405 mutex_unlock(&dqopt
->dqio_mutex
);
406 mutex_unlock(&dquot
->dq_lock
);
409 EXPORT_SYMBOL(dquot_acquire
);
412 * Write dquot to disk
414 int dquot_commit(struct dquot
*dquot
)
416 int ret
= 0, ret2
= 0;
417 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
419 mutex_lock(&dqopt
->dqio_mutex
);
420 spin_lock(&dq_list_lock
);
421 if (!clear_dquot_dirty(dquot
)) {
422 spin_unlock(&dq_list_lock
);
425 spin_unlock(&dq_list_lock
);
426 /* Inactive dquot can be only if there was error during read/init
427 * => we have better not writing it */
428 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
429 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
430 if (info_dirty(&dqopt
->info
[dquot
->dq_type
])) {
431 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(
432 dquot
->dq_sb
, dquot
->dq_type
);
438 mutex_unlock(&dqopt
->dqio_mutex
);
441 EXPORT_SYMBOL(dquot_commit
);
446 int dquot_release(struct dquot
*dquot
)
448 int ret
= 0, ret2
= 0;
449 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
451 mutex_lock(&dquot
->dq_lock
);
452 /* Check whether we are not racing with some other dqget() */
453 if (atomic_read(&dquot
->dq_count
) > 1)
455 mutex_lock(&dqopt
->dqio_mutex
);
456 if (dqopt
->ops
[dquot
->dq_type
]->release_dqblk
) {
457 ret
= dqopt
->ops
[dquot
->dq_type
]->release_dqblk(dquot
);
459 if (info_dirty(&dqopt
->info
[dquot
->dq_type
])) {
460 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(
461 dquot
->dq_sb
, dquot
->dq_type
);
466 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
467 mutex_unlock(&dqopt
->dqio_mutex
);
469 mutex_unlock(&dquot
->dq_lock
);
472 EXPORT_SYMBOL(dquot_release
);
474 void dquot_destroy(struct dquot
*dquot
)
476 kmem_cache_free(dquot_cachep
, dquot
);
478 EXPORT_SYMBOL(dquot_destroy
);
480 static inline void do_destroy_dquot(struct dquot
*dquot
)
482 dquot
->dq_sb
->dq_op
->destroy_dquot(dquot
);
485 /* Invalidate all dquots on the list. Note that this function is called after
486 * quota is disabled and pointers from inodes removed so there cannot be new
487 * quota users. There can still be some users of quotas due to inodes being
488 * just deleted or pruned by prune_icache() (those are not attached to any
489 * list) or parallel quotactl call. We have to wait for such users.
491 static void invalidate_dquots(struct super_block
*sb
, int type
)
493 struct dquot
*dquot
, *tmp
;
496 spin_lock(&dq_list_lock
);
497 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
498 if (dquot
->dq_sb
!= sb
)
500 if (dquot
->dq_type
!= type
)
502 /* Wait for dquot users */
503 if (atomic_read(&dquot
->dq_count
)) {
506 atomic_inc(&dquot
->dq_count
);
507 prepare_to_wait(&dquot
->dq_wait_unused
, &wait
,
508 TASK_UNINTERRUPTIBLE
);
509 spin_unlock(&dq_list_lock
);
510 /* Once dqput() wakes us up, we know it's time to free
512 * IMPORTANT: we rely on the fact that there is always
513 * at most one process waiting for dquot to free.
514 * Otherwise dq_count would be > 1 and we would never
517 if (atomic_read(&dquot
->dq_count
) > 1)
519 finish_wait(&dquot
->dq_wait_unused
, &wait
);
521 /* At this moment dquot() need not exist (it could be
522 * reclaimed by prune_dqcache(). Hence we must
527 * Quota now has no users and it has been written on last
530 remove_dquot_hash(dquot
);
531 remove_free_dquot(dquot
);
533 do_destroy_dquot(dquot
);
535 spin_unlock(&dq_list_lock
);
538 /* Call callback for every active dquot on given filesystem */
539 int dquot_scan_active(struct super_block
*sb
,
540 int (*fn
)(struct dquot
*dquot
, unsigned long priv
),
543 struct dquot
*dquot
, *old_dquot
= NULL
;
546 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
547 spin_lock(&dq_list_lock
);
548 list_for_each_entry(dquot
, &inuse_list
, dq_inuse
) {
549 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
551 if (dquot
->dq_sb
!= sb
)
553 /* Now we have active dquot so we can just increase use count */
554 atomic_inc(&dquot
->dq_count
);
556 spin_unlock(&dq_list_lock
);
559 ret
= fn(dquot
, priv
);
562 spin_lock(&dq_list_lock
);
563 /* We are safe to continue now because our dquot could not
564 * be moved out of the inuse list while we hold the reference */
566 spin_unlock(&dq_list_lock
);
569 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
572 EXPORT_SYMBOL(dquot_scan_active
);
574 int vfs_quota_sync(struct super_block
*sb
, int type
, int wait
)
576 struct list_head
*dirty
;
578 struct quota_info
*dqopt
= sb_dqopt(sb
);
581 mutex_lock(&dqopt
->dqonoff_mutex
);
582 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
583 if (type
!= -1 && cnt
!= type
)
585 if (!sb_has_quota_active(sb
, cnt
))
587 spin_lock(&dq_list_lock
);
588 dirty
= &dqopt
->info
[cnt
].dqi_dirty_list
;
589 while (!list_empty(dirty
)) {
590 dquot
= list_first_entry(dirty
, struct dquot
,
592 /* Dirty and inactive can be only bad dquot... */
593 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
594 clear_dquot_dirty(dquot
);
597 /* Now we have active dquot from which someone is
598 * holding reference so we can safely just increase
600 atomic_inc(&dquot
->dq_count
);
602 spin_unlock(&dq_list_lock
);
603 sb
->dq_op
->write_dquot(dquot
);
605 spin_lock(&dq_list_lock
);
607 spin_unlock(&dq_list_lock
);
610 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
611 if ((cnt
== type
|| type
== -1) && sb_has_quota_active(sb
, cnt
)
612 && info_dirty(&dqopt
->info
[cnt
]))
613 sb
->dq_op
->write_info(sb
, cnt
);
614 spin_lock(&dq_list_lock
);
616 spin_unlock(&dq_list_lock
);
617 mutex_unlock(&dqopt
->dqonoff_mutex
);
619 if (!wait
|| (sb_dqopt(sb
)->flags
& DQUOT_QUOTA_SYS_FILE
))
622 /* This is not very clever (and fast) but currently I don't know about
623 * any other simple way of getting quota data to disk and we must get
624 * them there for userspace to be visible... */
625 if (sb
->s_op
->sync_fs
)
626 sb
->s_op
->sync_fs(sb
, 1);
627 sync_blockdev(sb
->s_bdev
);
630 * Now when everything is written we can discard the pagecache so
631 * that userspace sees the changes.
633 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
634 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
635 if (type
!= -1 && cnt
!= type
)
637 if (!sb_has_quota_active(sb
, cnt
))
639 mutex_lock_nested(&sb_dqopt(sb
)->files
[cnt
]->i_mutex
,
641 truncate_inode_pages(&sb_dqopt(sb
)->files
[cnt
]->i_data
, 0);
642 mutex_unlock(&sb_dqopt(sb
)->files
[cnt
]->i_mutex
);
644 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
648 EXPORT_SYMBOL(vfs_quota_sync
);
650 /* Free unused dquots from cache */
651 static void prune_dqcache(int count
)
653 struct list_head
*head
;
656 head
= free_dquots
.prev
;
657 while (head
!= &free_dquots
&& count
) {
658 dquot
= list_entry(head
, struct dquot
, dq_free
);
659 remove_dquot_hash(dquot
);
660 remove_free_dquot(dquot
);
662 do_destroy_dquot(dquot
);
664 head
= free_dquots
.prev
;
669 * This is called from kswapd when we think we need some
673 static int shrink_dqcache_memory(int nr
, gfp_t gfp_mask
)
676 spin_lock(&dq_list_lock
);
678 spin_unlock(&dq_list_lock
);
680 return (dqstats
.free_dquots
/ 100) * sysctl_vfs_cache_pressure
;
683 static struct shrinker dqcache_shrinker
= {
684 .shrink
= shrink_dqcache_memory
,
685 .seeks
= DEFAULT_SEEKS
,
689 * Put reference to dquot
690 * NOTE: If you change this function please check whether dqput_blocks() works right...
692 void dqput(struct dquot
*dquot
)
698 #ifdef __DQUOT_PARANOIA
699 if (!atomic_read(&dquot
->dq_count
)) {
700 printk("VFS: dqput: trying to free free dquot\n");
701 printk("VFS: device %s, dquot of %s %d\n",
703 quotatypes
[dquot
->dq_type
],
709 spin_lock(&dq_list_lock
);
711 spin_unlock(&dq_list_lock
);
713 spin_lock(&dq_list_lock
);
714 if (atomic_read(&dquot
->dq_count
) > 1) {
715 /* We have more than one user... nothing to do */
716 atomic_dec(&dquot
->dq_count
);
717 /* Releasing dquot during quotaoff phase? */
718 if (!sb_has_quota_active(dquot
->dq_sb
, dquot
->dq_type
) &&
719 atomic_read(&dquot
->dq_count
) == 1)
720 wake_up(&dquot
->dq_wait_unused
);
721 spin_unlock(&dq_list_lock
);
724 /* Need to release dquot? */
725 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && dquot_dirty(dquot
)) {
726 spin_unlock(&dq_list_lock
);
727 /* Commit dquot before releasing */
728 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
730 printk(KERN_ERR
"VFS: cannot write quota structure on "
731 "device %s (error %d). Quota may get out of "
732 "sync!\n", dquot
->dq_sb
->s_id
, ret
);
734 * We clear dirty bit anyway, so that we avoid
737 spin_lock(&dq_list_lock
);
738 clear_dquot_dirty(dquot
);
739 spin_unlock(&dq_list_lock
);
743 /* Clear flag in case dquot was inactive (something bad happened) */
744 clear_dquot_dirty(dquot
);
745 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
746 spin_unlock(&dq_list_lock
);
747 dquot
->dq_sb
->dq_op
->release_dquot(dquot
);
750 atomic_dec(&dquot
->dq_count
);
751 #ifdef __DQUOT_PARANOIA
753 BUG_ON(!list_empty(&dquot
->dq_free
));
755 put_dquot_last(dquot
);
756 spin_unlock(&dq_list_lock
);
758 EXPORT_SYMBOL(dqput
);
760 struct dquot
*dquot_alloc(struct super_block
*sb
, int type
)
762 return kmem_cache_zalloc(dquot_cachep
, GFP_NOFS
);
764 EXPORT_SYMBOL(dquot_alloc
);
766 static struct dquot
*get_empty_dquot(struct super_block
*sb
, int type
)
770 dquot
= sb
->dq_op
->alloc_dquot(sb
, type
);
774 mutex_init(&dquot
->dq_lock
);
775 INIT_LIST_HEAD(&dquot
->dq_free
);
776 INIT_LIST_HEAD(&dquot
->dq_inuse
);
777 INIT_HLIST_NODE(&dquot
->dq_hash
);
778 INIT_LIST_HEAD(&dquot
->dq_dirty
);
779 init_waitqueue_head(&dquot
->dq_wait_unused
);
781 dquot
->dq_type
= type
;
782 atomic_set(&dquot
->dq_count
, 1);
788 * Get reference to dquot
790 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
791 * destroying our dquot by:
792 * a) checking for quota flags under dq_list_lock and
793 * b) getting a reference to dquot before we release dq_list_lock
795 struct dquot
*dqget(struct super_block
*sb
, unsigned int id
, int type
)
797 unsigned int hashent
= hashfn(sb
, id
, type
);
798 struct dquot
*dquot
= NULL
, *empty
= NULL
;
800 if (!sb_has_quota_active(sb
, type
))
803 spin_lock(&dq_list_lock
);
804 spin_lock(&dq_state_lock
);
805 if (!sb_has_quota_active(sb
, type
)) {
806 spin_unlock(&dq_state_lock
);
807 spin_unlock(&dq_list_lock
);
810 spin_unlock(&dq_state_lock
);
812 dquot
= find_dquot(hashent
, sb
, id
, type
);
815 spin_unlock(&dq_list_lock
);
816 empty
= get_empty_dquot(sb
, type
);
818 schedule(); /* Try to wait for a moment... */
824 /* all dquots go on the inuse_list */
826 /* hash it first so it can be found */
827 insert_dquot_hash(dquot
);
829 spin_unlock(&dq_list_lock
);
831 if (!atomic_read(&dquot
->dq_count
))
832 remove_free_dquot(dquot
);
833 atomic_inc(&dquot
->dq_count
);
834 dqstats
.cache_hits
++;
836 spin_unlock(&dq_list_lock
);
838 /* Wait for dq_lock - after this we know that either dquot_release() is
839 * already finished or it will be canceled due to dq_count > 1 test */
840 wait_on_dquot(dquot
);
841 /* Read the dquot / allocate space in quota file */
842 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) &&
843 sb
->dq_op
->acquire_dquot(dquot
) < 0) {
848 #ifdef __DQUOT_PARANOIA
849 BUG_ON(!dquot
->dq_sb
); /* Has somebody invalidated entry under us? */
853 do_destroy_dquot(empty
);
857 EXPORT_SYMBOL(dqget
);
859 static int dqinit_needed(struct inode
*inode
, int type
)
863 if (IS_NOQUOTA(inode
))
866 return !inode
->i_dquot
[type
];
867 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
868 if (!inode
->i_dquot
[cnt
])
873 /* This routine is guarded by dqonoff_mutex mutex */
874 static void add_dquot_ref(struct super_block
*sb
, int type
)
876 struct inode
*inode
, *old_inode
= NULL
;
877 #ifdef __DQUOT_PARANOIA
881 spin_lock(&inode_lock
);
882 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
883 if (inode
->i_state
& (I_FREEING
|I_CLEAR
|I_WILL_FREE
|I_NEW
))
885 #ifdef __DQUOT_PARANOIA
886 if (unlikely(inode_get_rsv_space(inode
) > 0))
889 if (!atomic_read(&inode
->i_writecount
))
891 if (!dqinit_needed(inode
, type
))
895 spin_unlock(&inode_lock
);
898 __dquot_initialize(inode
, type
);
899 /* We hold a reference to 'inode' so it couldn't have been
900 * removed from s_inodes list while we dropped the inode_lock.
901 * We cannot iput the inode now as we can be holding the last
902 * reference and we cannot iput it under inode_lock. So we
903 * keep the reference and iput it later. */
905 spin_lock(&inode_lock
);
907 spin_unlock(&inode_lock
);
910 #ifdef __DQUOT_PARANOIA
912 printk(KERN_WARNING
"VFS (%s): Writes happened before quota"
913 " was turned on thus quota information is probably "
914 "inconsistent. Please run quotacheck(8).\n", sb
->s_id
);
920 * Return 0 if dqput() won't block.
921 * (note that 1 doesn't necessarily mean blocking)
923 static inline int dqput_blocks(struct dquot
*dquot
)
925 if (atomic_read(&dquot
->dq_count
) <= 1)
931 * Remove references to dquots from inode and add dquot to list for freeing
932 * if we have the last referece to dquot
933 * We can't race with anybody because we hold dqptr_sem for writing...
935 static int remove_inode_dquot_ref(struct inode
*inode
, int type
,
936 struct list_head
*tofree_head
)
938 struct dquot
*dquot
= inode
->i_dquot
[type
];
940 inode
->i_dquot
[type
] = NULL
;
942 if (dqput_blocks(dquot
)) {
943 #ifdef __DQUOT_PARANOIA
944 if (atomic_read(&dquot
->dq_count
) != 1)
945 printk(KERN_WARNING
"VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot
->dq_count
));
947 spin_lock(&dq_list_lock
);
948 /* As dquot must have currently users it can't be on
949 * the free list... */
950 list_add(&dquot
->dq_free
, tofree_head
);
951 spin_unlock(&dq_list_lock
);
955 dqput(dquot
); /* We have guaranteed we won't block */
961 * Free list of dquots
962 * Dquots are removed from inodes and no new references can be got so we are
963 * the only ones holding reference
965 static void put_dquot_list(struct list_head
*tofree_head
)
967 struct list_head
*act_head
;
970 act_head
= tofree_head
->next
;
971 while (act_head
!= tofree_head
) {
972 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
973 act_head
= act_head
->next
;
974 /* Remove dquot from the list so we won't have problems... */
975 list_del_init(&dquot
->dq_free
);
980 static void remove_dquot_ref(struct super_block
*sb
, int type
,
981 struct list_head
*tofree_head
)
985 spin_lock(&inode_lock
);
986 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
988 * We have to scan also I_NEW inodes because they can already
989 * have quota pointer initialized. Luckily, we need to touch
990 * only quota pointers and these have separate locking
993 if (!IS_NOQUOTA(inode
))
994 remove_inode_dquot_ref(inode
, type
, tofree_head
);
996 spin_unlock(&inode_lock
);
999 /* Gather all references from inodes and drop them */
1000 static void drop_dquot_ref(struct super_block
*sb
, int type
)
1002 LIST_HEAD(tofree_head
);
1005 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1006 remove_dquot_ref(sb
, type
, &tofree_head
);
1007 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1008 put_dquot_list(&tofree_head
);
1012 static inline void dquot_incr_inodes(struct dquot
*dquot
, qsize_t number
)
1014 dquot
->dq_dqb
.dqb_curinodes
+= number
;
1017 static inline void dquot_incr_space(struct dquot
*dquot
, qsize_t number
)
1019 dquot
->dq_dqb
.dqb_curspace
+= number
;
1022 static inline void dquot_resv_space(struct dquot
*dquot
, qsize_t number
)
1024 dquot
->dq_dqb
.dqb_rsvspace
+= number
;
1028 * Claim reserved quota space
1030 static void dquot_claim_reserved_space(struct dquot
*dquot
, qsize_t number
)
1032 if (dquot
->dq_dqb
.dqb_rsvspace
< number
) {
1034 number
= dquot
->dq_dqb
.dqb_rsvspace
;
1036 dquot
->dq_dqb
.dqb_curspace
+= number
;
1037 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1041 void dquot_free_reserved_space(struct dquot
*dquot
, qsize_t number
)
1043 if (dquot
->dq_dqb
.dqb_rsvspace
>= number
)
1044 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1047 dquot
->dq_dqb
.dqb_rsvspace
= 0;
1051 static void dquot_decr_inodes(struct dquot
*dquot
, qsize_t number
)
1053 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1054 dquot
->dq_dqb
.dqb_curinodes
>= number
)
1055 dquot
->dq_dqb
.dqb_curinodes
-= number
;
1057 dquot
->dq_dqb
.dqb_curinodes
= 0;
1058 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1059 dquot
->dq_dqb
.dqb_itime
= (time_t) 0;
1060 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
1063 static void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
1065 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1066 dquot
->dq_dqb
.dqb_curspace
>= number
)
1067 dquot
->dq_dqb
.dqb_curspace
-= number
;
1069 dquot
->dq_dqb
.dqb_curspace
= 0;
1070 if (dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1071 dquot
->dq_dqb
.dqb_btime
= (time_t) 0;
1072 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1075 static int warning_issued(struct dquot
*dquot
, const int warntype
)
1077 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
1078 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
1079 ((warntype
== QUOTA_NL_IHARDWARN
||
1080 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
1084 return test_and_set_bit(flag
, &dquot
->dq_flags
);
1087 #ifdef CONFIG_PRINT_QUOTA_WARNING
1088 static int flag_print_warnings
= 1;
1090 static int need_print_warning(struct dquot
*dquot
)
1092 if (!flag_print_warnings
)
1095 switch (dquot
->dq_type
) {
1097 return current_fsuid() == dquot
->dq_id
;
1099 return in_group_p(dquot
->dq_id
);
1104 /* Print warning to user which exceeded quota */
1105 static void print_warning(struct dquot
*dquot
, const int warntype
)
1108 struct tty_struct
*tty
;
1110 if (warntype
== QUOTA_NL_IHARDBELOW
||
1111 warntype
== QUOTA_NL_ISOFTBELOW
||
1112 warntype
== QUOTA_NL_BHARDBELOW
||
1113 warntype
== QUOTA_NL_BSOFTBELOW
|| !need_print_warning(dquot
))
1116 tty
= get_current_tty();
1119 tty_write_message(tty
, dquot
->dq_sb
->s_id
);
1120 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
1121 tty_write_message(tty
, ": warning, ");
1123 tty_write_message(tty
, ": write failed, ");
1124 tty_write_message(tty
, quotatypes
[dquot
->dq_type
]);
1126 case QUOTA_NL_IHARDWARN
:
1127 msg
= " file limit reached.\r\n";
1129 case QUOTA_NL_ISOFTLONGWARN
:
1130 msg
= " file quota exceeded too long.\r\n";
1132 case QUOTA_NL_ISOFTWARN
:
1133 msg
= " file quota exceeded.\r\n";
1135 case QUOTA_NL_BHARDWARN
:
1136 msg
= " block limit reached.\r\n";
1138 case QUOTA_NL_BSOFTLONGWARN
:
1139 msg
= " block quota exceeded too long.\r\n";
1141 case QUOTA_NL_BSOFTWARN
:
1142 msg
= " block quota exceeded.\r\n";
1145 tty_write_message(tty
, msg
);
1151 * Write warnings to the console and send warning messages over netlink.
1153 * Note that this function can sleep.
1155 static void flush_warnings(struct dquot
*const *dquots
, char *warntype
)
1160 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1162 if (dq
&& warntype
[i
] != QUOTA_NL_NOWARN
&&
1163 !warning_issued(dq
, warntype
[i
])) {
1164 #ifdef CONFIG_PRINT_QUOTA_WARNING
1165 print_warning(dq
, warntype
[i
]);
1167 quota_send_warning(dq
->dq_type
, dq
->dq_id
,
1168 dq
->dq_sb
->s_dev
, warntype
[i
]);
1173 static int ignore_hardlimit(struct dquot
*dquot
)
1175 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
1177 return capable(CAP_SYS_RESOURCE
) &&
1178 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
||
1179 !(info
->dqi_flags
& V1_DQF_RSQUASH
));
1182 /* needs dq_data_lock */
1183 static int check_idq(struct dquot
*dquot
, qsize_t inodes
, char *warntype
)
1185 qsize_t newinodes
= dquot
->dq_dqb
.dqb_curinodes
+ inodes
;
1187 *warntype
= QUOTA_NL_NOWARN
;
1188 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
) ||
1189 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1192 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1193 newinodes
> dquot
->dq_dqb
.dqb_ihardlimit
&&
1194 !ignore_hardlimit(dquot
)) {
1195 *warntype
= QUOTA_NL_IHARDWARN
;
1199 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1200 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1201 dquot
->dq_dqb
.dqb_itime
&&
1202 get_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1203 !ignore_hardlimit(dquot
)) {
1204 *warntype
= QUOTA_NL_ISOFTLONGWARN
;
1208 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1209 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1210 dquot
->dq_dqb
.dqb_itime
== 0) {
1211 *warntype
= QUOTA_NL_ISOFTWARN
;
1212 dquot
->dq_dqb
.dqb_itime
= get_seconds() +
1213 sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_igrace
;
1219 /* needs dq_data_lock */
1220 static int check_bdq(struct dquot
*dquot
, qsize_t space
, int prealloc
, char *warntype
)
1223 struct super_block
*sb
= dquot
->dq_sb
;
1225 *warntype
= QUOTA_NL_NOWARN
;
1226 if (!sb_has_quota_limits_enabled(sb
, dquot
->dq_type
) ||
1227 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1230 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
1233 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1234 tspace
> dquot
->dq_dqb
.dqb_bhardlimit
&&
1235 !ignore_hardlimit(dquot
)) {
1237 *warntype
= QUOTA_NL_BHARDWARN
;
1241 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1242 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1243 dquot
->dq_dqb
.dqb_btime
&&
1244 get_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1245 !ignore_hardlimit(dquot
)) {
1247 *warntype
= QUOTA_NL_BSOFTLONGWARN
;
1251 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1252 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1253 dquot
->dq_dqb
.dqb_btime
== 0) {
1255 *warntype
= QUOTA_NL_BSOFTWARN
;
1256 dquot
->dq_dqb
.dqb_btime
= get_seconds() +
1257 sb_dqopt(sb
)->info
[dquot
->dq_type
].dqi_bgrace
;
1261 * We don't allow preallocation to exceed softlimit so exceeding will
1270 static int info_idq_free(struct dquot
*dquot
, qsize_t inodes
)
1274 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1275 dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
||
1276 !sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
))
1277 return QUOTA_NL_NOWARN
;
1279 newinodes
= dquot
->dq_dqb
.dqb_curinodes
- inodes
;
1280 if (newinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1281 return QUOTA_NL_ISOFTBELOW
;
1282 if (dquot
->dq_dqb
.dqb_curinodes
>= dquot
->dq_dqb
.dqb_ihardlimit
&&
1283 newinodes
< dquot
->dq_dqb
.dqb_ihardlimit
)
1284 return QUOTA_NL_IHARDBELOW
;
1285 return QUOTA_NL_NOWARN
;
1288 static int info_bdq_free(struct dquot
*dquot
, qsize_t space
)
1290 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1291 dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1292 return QUOTA_NL_NOWARN
;
1294 if (dquot
->dq_dqb
.dqb_curspace
- space
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1295 return QUOTA_NL_BSOFTBELOW
;
1296 if (dquot
->dq_dqb
.dqb_curspace
>= dquot
->dq_dqb
.dqb_bhardlimit
&&
1297 dquot
->dq_dqb
.dqb_curspace
- space
< dquot
->dq_dqb
.dqb_bhardlimit
)
1298 return QUOTA_NL_BHARDBELOW
;
1299 return QUOTA_NL_NOWARN
;
1303 * Initialize quota pointers in inode
1305 * We do things in a bit complicated way but by that we avoid calling
1306 * dqget() and thus filesystem callbacks under dqptr_sem.
1308 * It is better to call this function outside of any transaction as it
1309 * might need a lot of space in journal for dquot structure allocation.
1311 static void __dquot_initialize(struct inode
*inode
, int type
)
1313 unsigned int id
= 0;
1315 struct dquot
*got
[MAXQUOTAS
];
1316 struct super_block
*sb
= inode
->i_sb
;
1319 /* First test before acquiring mutex - solves deadlocks when we
1320 * re-enter the quota code and are already holding the mutex */
1321 if (!sb_any_quota_active(inode
->i_sb
) || IS_NOQUOTA(inode
))
1324 /* First get references to structures we might need. */
1325 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1327 if (type
!= -1 && cnt
!= type
)
1337 got
[cnt
] = dqget(sb
, id
, cnt
);
1340 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1341 if (IS_NOQUOTA(inode
))
1343 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1344 if (type
!= -1 && cnt
!= type
)
1346 /* Avoid races with quotaoff() */
1347 if (!sb_has_quota_active(sb
, cnt
))
1349 if (!inode
->i_dquot
[cnt
]) {
1350 inode
->i_dquot
[cnt
] = got
[cnt
];
1353 * Make quota reservation system happy if someone
1354 * did a write before quota was turned on
1356 rsv
= inode_get_rsv_space(inode
);
1358 dquot_resv_space(inode
->i_dquot
[cnt
], rsv
);
1362 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1363 /* Drop unused references */
1367 void dquot_initialize(struct inode
*inode
)
1369 __dquot_initialize(inode
, -1);
1371 EXPORT_SYMBOL(dquot_initialize
);
1374 * Release all quotas referenced by inode
1376 static void __dquot_drop(struct inode
*inode
)
1379 struct dquot
*put
[MAXQUOTAS
];
1381 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1382 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1383 put
[cnt
] = inode
->i_dquot
[cnt
];
1384 inode
->i_dquot
[cnt
] = NULL
;
1386 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1390 void dquot_drop(struct inode
*inode
)
1394 if (IS_NOQUOTA(inode
))
1398 * Test before calling to rule out calls from proc and such
1399 * where we are not allowed to block. Note that this is
1400 * actually reliable test even without the lock - the caller
1401 * must assure that nobody can come after the DQUOT_DROP and
1402 * add quota pointers back anyway.
1404 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1405 if (inode
->i_dquot
[cnt
])
1409 if (cnt
< MAXQUOTAS
)
1410 __dquot_drop(inode
);
1412 EXPORT_SYMBOL(dquot_drop
);
1415 * inode_reserved_space is managed internally by quota, and protected by
1416 * i_lock similar to i_blocks+i_bytes.
1418 static qsize_t
*inode_reserved_space(struct inode
* inode
)
1420 /* Filesystem must explicitly define it's own method in order to use
1421 * quota reservation interface */
1422 BUG_ON(!inode
->i_sb
->dq_op
->get_reserved_space
);
1423 return inode
->i_sb
->dq_op
->get_reserved_space(inode
);
1426 void inode_add_rsv_space(struct inode
*inode
, qsize_t number
)
1428 spin_lock(&inode
->i_lock
);
1429 *inode_reserved_space(inode
) += number
;
1430 spin_unlock(&inode
->i_lock
);
1432 EXPORT_SYMBOL(inode_add_rsv_space
);
1434 void inode_claim_rsv_space(struct inode
*inode
, qsize_t number
)
1436 spin_lock(&inode
->i_lock
);
1437 *inode_reserved_space(inode
) -= number
;
1438 __inode_add_bytes(inode
, number
);
1439 spin_unlock(&inode
->i_lock
);
1441 EXPORT_SYMBOL(inode_claim_rsv_space
);
1443 void inode_sub_rsv_space(struct inode
*inode
, qsize_t number
)
1445 spin_lock(&inode
->i_lock
);
1446 *inode_reserved_space(inode
) -= number
;
1447 spin_unlock(&inode
->i_lock
);
1449 EXPORT_SYMBOL(inode_sub_rsv_space
);
1451 static qsize_t
inode_get_rsv_space(struct inode
*inode
)
1455 if (!inode
->i_sb
->dq_op
->get_reserved_space
)
1457 spin_lock(&inode
->i_lock
);
1458 ret
= *inode_reserved_space(inode
);
1459 spin_unlock(&inode
->i_lock
);
1463 static void inode_incr_space(struct inode
*inode
, qsize_t number
,
1467 inode_add_rsv_space(inode
, number
);
1469 inode_add_bytes(inode
, number
);
1472 static void inode_decr_space(struct inode
*inode
, qsize_t number
, int reserve
)
1475 inode_sub_rsv_space(inode
, number
);
1477 inode_sub_bytes(inode
, number
);
1481 * This functions updates i_blocks+i_bytes fields and quota information
1482 * (together with appropriate checks).
1484 * NOTE: We absolutely rely on the fact that caller dirties the inode
1485 * (usually helpers in quotaops.h care about this) and holds a handle for
1486 * the current transaction so that dquot write and inode write go into the
1491 * This operation can block, but only after everything is updated
1493 int __dquot_alloc_space(struct inode
*inode
, qsize_t number
,
1494 int warn
, int reserve
)
1497 char warntype
[MAXQUOTAS
];
1500 * First test before acquiring mutex - solves deadlocks when we
1501 * re-enter the quota code and are already holding the mutex
1503 if (!sb_any_quota_active(inode
->i_sb
) || IS_NOQUOTA(inode
)) {
1504 inode_incr_space(inode
, number
, reserve
);
1508 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1509 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1510 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1512 spin_lock(&dq_data_lock
);
1513 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1514 if (!inode
->i_dquot
[cnt
])
1516 ret
= check_bdq(inode
->i_dquot
[cnt
], number
, !warn
,
1519 spin_unlock(&dq_data_lock
);
1520 goto out_flush_warn
;
1523 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1524 if (!inode
->i_dquot
[cnt
])
1527 dquot_resv_space(inode
->i_dquot
[cnt
], number
);
1529 dquot_incr_space(inode
->i_dquot
[cnt
], number
);
1531 inode_incr_space(inode
, number
, reserve
);
1532 spin_unlock(&dq_data_lock
);
1535 goto out_flush_warn
;
1536 mark_all_dquot_dirty(inode
->i_dquot
);
1538 flush_warnings(inode
->i_dquot
, warntype
);
1539 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1543 EXPORT_SYMBOL(__dquot_alloc_space
);
1546 * This operation can block, but only after everything is updated
1548 int dquot_alloc_inode(const struct inode
*inode
)
1551 char warntype
[MAXQUOTAS
];
1553 /* First test before acquiring mutex - solves deadlocks when we
1554 * re-enter the quota code and are already holding the mutex */
1555 if (!sb_any_quota_active(inode
->i_sb
) || IS_NOQUOTA(inode
))
1557 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1558 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1559 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1560 spin_lock(&dq_data_lock
);
1561 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1562 if (!inode
->i_dquot
[cnt
])
1564 ret
= check_idq(inode
->i_dquot
[cnt
], 1, warntype
+ cnt
);
1569 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1570 if (!inode
->i_dquot
[cnt
])
1572 dquot_incr_inodes(inode
->i_dquot
[cnt
], 1);
1576 spin_unlock(&dq_data_lock
);
1578 mark_all_dquot_dirty(inode
->i_dquot
);
1579 flush_warnings(inode
->i_dquot
, warntype
);
1580 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1583 EXPORT_SYMBOL(dquot_alloc_inode
);
1586 * Convert in-memory reserved quotas to real consumed quotas
1588 int dquot_claim_space_nodirty(struct inode
*inode
, qsize_t number
)
1592 if (!sb_any_quota_active(inode
->i_sb
) || IS_NOQUOTA(inode
)) {
1593 inode_claim_rsv_space(inode
, number
);
1597 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1598 spin_lock(&dq_data_lock
);
1599 /* Claim reserved quotas to allocated quotas */
1600 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1601 if (inode
->i_dquot
[cnt
])
1602 dquot_claim_reserved_space(inode
->i_dquot
[cnt
],
1605 /* Update inode bytes */
1606 inode_claim_rsv_space(inode
, number
);
1607 spin_unlock(&dq_data_lock
);
1608 mark_all_dquot_dirty(inode
->i_dquot
);
1609 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1612 EXPORT_SYMBOL(dquot_claim_space_nodirty
);
1615 * This operation can block, but only after everything is updated
1617 void __dquot_free_space(struct inode
*inode
, qsize_t number
, int reserve
)
1620 char warntype
[MAXQUOTAS
];
1622 /* First test before acquiring mutex - solves deadlocks when we
1623 * re-enter the quota code and are already holding the mutex */
1624 if (!sb_any_quota_active(inode
->i_sb
) || IS_NOQUOTA(inode
)) {
1625 inode_decr_space(inode
, number
, reserve
);
1629 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1630 spin_lock(&dq_data_lock
);
1631 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1632 if (!inode
->i_dquot
[cnt
])
1634 warntype
[cnt
] = info_bdq_free(inode
->i_dquot
[cnt
], number
);
1636 dquot_free_reserved_space(inode
->i_dquot
[cnt
], number
);
1638 dquot_decr_space(inode
->i_dquot
[cnt
], number
);
1640 inode_decr_space(inode
, number
, reserve
);
1641 spin_unlock(&dq_data_lock
);
1645 mark_all_dquot_dirty(inode
->i_dquot
);
1647 flush_warnings(inode
->i_dquot
, warntype
);
1648 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1650 EXPORT_SYMBOL(__dquot_free_space
);
1653 * This operation can block, but only after everything is updated
1655 void dquot_free_inode(const struct inode
*inode
)
1658 char warntype
[MAXQUOTAS
];
1660 /* First test before acquiring mutex - solves deadlocks when we
1661 * re-enter the quota code and are already holding the mutex */
1662 if (!sb_any_quota_active(inode
->i_sb
) || IS_NOQUOTA(inode
))
1665 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1666 spin_lock(&dq_data_lock
);
1667 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1668 if (!inode
->i_dquot
[cnt
])
1670 warntype
[cnt
] = info_idq_free(inode
->i_dquot
[cnt
], 1);
1671 dquot_decr_inodes(inode
->i_dquot
[cnt
], 1);
1673 spin_unlock(&dq_data_lock
);
1674 mark_all_dquot_dirty(inode
->i_dquot
);
1675 flush_warnings(inode
->i_dquot
, warntype
);
1676 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1678 EXPORT_SYMBOL(dquot_free_inode
);
1681 * Transfer the number of inode and blocks from one diskquota to an other.
1683 * This operation can block, but only after everything is updated
1684 * A transaction must be started when entering this function.
1686 static int __dquot_transfer(struct inode
*inode
, qid_t
*chid
, unsigned long mask
)
1688 qsize_t space
, cur_space
;
1689 qsize_t rsv_space
= 0;
1690 struct dquot
*transfer_from
[MAXQUOTAS
];
1691 struct dquot
*transfer_to
[MAXQUOTAS
];
1693 char warntype_to
[MAXQUOTAS
];
1694 char warntype_from_inodes
[MAXQUOTAS
], warntype_from_space
[MAXQUOTAS
];
1696 /* First test before acquiring mutex - solves deadlocks when we
1697 * re-enter the quota code and are already holding the mutex */
1698 if (IS_NOQUOTA(inode
))
1700 /* Initialize the arrays */
1701 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1702 transfer_from
[cnt
] = NULL
;
1703 transfer_to
[cnt
] = NULL
;
1704 warntype_to
[cnt
] = QUOTA_NL_NOWARN
;
1706 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1707 if (mask
& (1 << cnt
))
1708 transfer_to
[cnt
] = dqget(inode
->i_sb
, chid
[cnt
], cnt
);
1710 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1711 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1712 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1715 spin_lock(&dq_data_lock
);
1716 cur_space
= inode_get_bytes(inode
);
1717 rsv_space
= inode_get_rsv_space(inode
);
1718 space
= cur_space
+ rsv_space
;
1719 /* Build the transfer_from list and check the limits */
1720 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1721 if (!transfer_to
[cnt
])
1723 transfer_from
[cnt
] = inode
->i_dquot
[cnt
];
1724 ret
= check_idq(transfer_to
[cnt
], 1, warntype_to
+ cnt
);
1727 ret
= check_bdq(transfer_to
[cnt
], space
, 0, warntype_to
+ cnt
);
1733 * Finally perform the needed transfer from transfer_from to transfer_to
1735 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1737 * Skip changes for same uid or gid or for turned off quota-type.
1739 if (!transfer_to
[cnt
])
1742 /* Due to IO error we might not have transfer_from[] structure */
1743 if (transfer_from
[cnt
]) {
1744 warntype_from_inodes
[cnt
] =
1745 info_idq_free(transfer_from
[cnt
], 1);
1746 warntype_from_space
[cnt
] =
1747 info_bdq_free(transfer_from
[cnt
], space
);
1748 dquot_decr_inodes(transfer_from
[cnt
], 1);
1749 dquot_decr_space(transfer_from
[cnt
], cur_space
);
1750 dquot_free_reserved_space(transfer_from
[cnt
],
1754 dquot_incr_inodes(transfer_to
[cnt
], 1);
1755 dquot_incr_space(transfer_to
[cnt
], cur_space
);
1756 dquot_resv_space(transfer_to
[cnt
], rsv_space
);
1758 inode
->i_dquot
[cnt
] = transfer_to
[cnt
];
1760 spin_unlock(&dq_data_lock
);
1761 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1763 mark_all_dquot_dirty(transfer_from
);
1764 mark_all_dquot_dirty(transfer_to
);
1765 /* The reference we got is transferred to the inode */
1766 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1767 transfer_to
[cnt
] = NULL
;
1769 flush_warnings(transfer_to
, warntype_to
);
1770 flush_warnings(transfer_from
, warntype_from_inodes
);
1771 flush_warnings(transfer_from
, warntype_from_space
);
1773 dqput_all(transfer_from
);
1774 dqput_all(transfer_to
);
1777 spin_unlock(&dq_data_lock
);
1778 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1779 /* Clear dquot pointers we don't want to dqput() */
1780 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1781 transfer_from
[cnt
] = NULL
;
1785 /* Wrapper for transferring ownership of an inode for uid/gid only
1786 * Called from FSXXX_setattr()
1788 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
1790 qid_t chid
[MAXQUOTAS
];
1791 unsigned long mask
= 0;
1793 if (iattr
->ia_valid
& ATTR_UID
&& iattr
->ia_uid
!= inode
->i_uid
) {
1794 mask
|= 1 << USRQUOTA
;
1795 chid
[USRQUOTA
] = iattr
->ia_uid
;
1797 if (iattr
->ia_valid
& ATTR_GID
&& iattr
->ia_gid
!= inode
->i_gid
) {
1798 mask
|= 1 << GRPQUOTA
;
1799 chid
[GRPQUOTA
] = iattr
->ia_gid
;
1801 if (sb_any_quota_active(inode
->i_sb
) && !IS_NOQUOTA(inode
)) {
1802 dquot_initialize(inode
);
1803 return __dquot_transfer(inode
, chid
, mask
);
1807 EXPORT_SYMBOL(dquot_transfer
);
1810 * Write info of quota file to disk
1812 int dquot_commit_info(struct super_block
*sb
, int type
)
1815 struct quota_info
*dqopt
= sb_dqopt(sb
);
1817 mutex_lock(&dqopt
->dqio_mutex
);
1818 ret
= dqopt
->ops
[type
]->write_file_info(sb
, type
);
1819 mutex_unlock(&dqopt
->dqio_mutex
);
1822 EXPORT_SYMBOL(dquot_commit_info
);
1825 * Definitions of diskquota operations.
1827 const struct dquot_operations dquot_operations
= {
1828 .write_dquot
= dquot_commit
,
1829 .acquire_dquot
= dquot_acquire
,
1830 .release_dquot
= dquot_release
,
1831 .mark_dirty
= dquot_mark_dquot_dirty
,
1832 .write_info
= dquot_commit_info
,
1833 .alloc_dquot
= dquot_alloc
,
1834 .destroy_dquot
= dquot_destroy
,
1838 * Generic helper for ->open on filesystems supporting disk quotas.
1840 int dquot_file_open(struct inode
*inode
, struct file
*file
)
1844 error
= generic_file_open(inode
, file
);
1845 if (!error
&& (file
->f_mode
& FMODE_WRITE
))
1846 dquot_initialize(inode
);
1849 EXPORT_SYMBOL(dquot_file_open
);
1852 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1854 int vfs_quota_disable(struct super_block
*sb
, int type
, unsigned int flags
)
1857 struct quota_info
*dqopt
= sb_dqopt(sb
);
1858 struct inode
*toputinode
[MAXQUOTAS
];
1860 /* Cannot turn off usage accounting without turning off limits, or
1861 * suspend quotas and simultaneously turn quotas off. */
1862 if ((flags
& DQUOT_USAGE_ENABLED
&& !(flags
& DQUOT_LIMITS_ENABLED
))
1863 || (flags
& DQUOT_SUSPENDED
&& flags
& (DQUOT_LIMITS_ENABLED
|
1864 DQUOT_USAGE_ENABLED
)))
1867 /* We need to serialize quota_off() for device */
1868 mutex_lock(&dqopt
->dqonoff_mutex
);
1871 * Skip everything if there's nothing to do. We have to do this because
1872 * sometimes we are called when fill_super() failed and calling
1873 * sync_fs() in such cases does no good.
1875 if (!sb_any_quota_loaded(sb
)) {
1876 mutex_unlock(&dqopt
->dqonoff_mutex
);
1879 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1880 toputinode
[cnt
] = NULL
;
1881 if (type
!= -1 && cnt
!= type
)
1883 if (!sb_has_quota_loaded(sb
, cnt
))
1886 if (flags
& DQUOT_SUSPENDED
) {
1887 spin_lock(&dq_state_lock
);
1889 dquot_state_flag(DQUOT_SUSPENDED
, cnt
);
1890 spin_unlock(&dq_state_lock
);
1892 spin_lock(&dq_state_lock
);
1893 dqopt
->flags
&= ~dquot_state_flag(flags
, cnt
);
1894 /* Turning off suspended quotas? */
1895 if (!sb_has_quota_loaded(sb
, cnt
) &&
1896 sb_has_quota_suspended(sb
, cnt
)) {
1897 dqopt
->flags
&= ~dquot_state_flag(
1898 DQUOT_SUSPENDED
, cnt
);
1899 spin_unlock(&dq_state_lock
);
1900 iput(dqopt
->files
[cnt
]);
1901 dqopt
->files
[cnt
] = NULL
;
1904 spin_unlock(&dq_state_lock
);
1907 /* We still have to keep quota loaded? */
1908 if (sb_has_quota_loaded(sb
, cnt
) && !(flags
& DQUOT_SUSPENDED
))
1911 /* Note: these are blocking operations */
1912 drop_dquot_ref(sb
, cnt
);
1913 invalidate_dquots(sb
, cnt
);
1915 * Now all dquots should be invalidated, all writes done so we
1916 * should be only users of the info. No locks needed.
1918 if (info_dirty(&dqopt
->info
[cnt
]))
1919 sb
->dq_op
->write_info(sb
, cnt
);
1920 if (dqopt
->ops
[cnt
]->free_file_info
)
1921 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
1922 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
1924 toputinode
[cnt
] = dqopt
->files
[cnt
];
1925 if (!sb_has_quota_loaded(sb
, cnt
))
1926 dqopt
->files
[cnt
] = NULL
;
1927 dqopt
->info
[cnt
].dqi_flags
= 0;
1928 dqopt
->info
[cnt
].dqi_igrace
= 0;
1929 dqopt
->info
[cnt
].dqi_bgrace
= 0;
1930 dqopt
->ops
[cnt
] = NULL
;
1932 mutex_unlock(&dqopt
->dqonoff_mutex
);
1934 /* Skip syncing and setting flags if quota files are hidden */
1935 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
1938 /* Sync the superblock so that buffers with quota data are written to
1939 * disk (and so userspace sees correct data afterwards). */
1940 if (sb
->s_op
->sync_fs
)
1941 sb
->s_op
->sync_fs(sb
, 1);
1942 sync_blockdev(sb
->s_bdev
);
1943 /* Now the quota files are just ordinary files and we can set the
1944 * inode flags back. Moreover we discard the pagecache so that
1945 * userspace sees the writes we did bypassing the pagecache. We
1946 * must also discard the blockdev buffers so that we see the
1947 * changes done by userspace on the next quotaon() */
1948 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1949 if (toputinode
[cnt
]) {
1950 mutex_lock(&dqopt
->dqonoff_mutex
);
1951 /* If quota was reenabled in the meantime, we have
1953 if (!sb_has_quota_loaded(sb
, cnt
)) {
1954 mutex_lock_nested(&toputinode
[cnt
]->i_mutex
,
1956 toputinode
[cnt
]->i_flags
&= ~(S_IMMUTABLE
|
1957 S_NOATIME
| S_NOQUOTA
);
1958 truncate_inode_pages(&toputinode
[cnt
]->i_data
,
1960 mutex_unlock(&toputinode
[cnt
]->i_mutex
);
1961 mark_inode_dirty(toputinode
[cnt
]);
1963 mutex_unlock(&dqopt
->dqonoff_mutex
);
1966 invalidate_bdev(sb
->s_bdev
);
1968 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1969 if (toputinode
[cnt
]) {
1970 /* On remount RO, we keep the inode pointer so that we
1971 * can reenable quota on the subsequent remount RW. We
1972 * have to check 'flags' variable and not use sb_has_
1973 * function because another quotaon / quotaoff could
1974 * change global state before we got here. We refuse
1975 * to suspend quotas when there is pending delete on
1976 * the quota file... */
1977 if (!(flags
& DQUOT_SUSPENDED
))
1978 iput(toputinode
[cnt
]);
1979 else if (!toputinode
[cnt
]->i_nlink
)
1984 EXPORT_SYMBOL(vfs_quota_disable
);
1986 int vfs_quota_off(struct super_block
*sb
, int type
, int remount
)
1988 return vfs_quota_disable(sb
, type
, remount
? DQUOT_SUSPENDED
:
1989 (DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
));
1991 EXPORT_SYMBOL(vfs_quota_off
);
1993 * Turn quotas on on a device
1997 * Helper function to turn quotas on when we already have the inode of
1998 * quota file and no quota information is loaded.
2000 static int vfs_load_quota_inode(struct inode
*inode
, int type
, int format_id
,
2003 struct quota_format_type
*fmt
= find_quota_format(format_id
);
2004 struct super_block
*sb
= inode
->i_sb
;
2005 struct quota_info
*dqopt
= sb_dqopt(sb
);
2011 if (!S_ISREG(inode
->i_mode
)) {
2015 if (IS_RDONLY(inode
)) {
2019 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
) {
2023 /* Usage always has to be set... */
2024 if (!(flags
& DQUOT_USAGE_ENABLED
)) {
2029 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2030 /* As we bypass the pagecache we must now flush all the
2031 * dirty data and invalidate caches so that kernel sees
2032 * changes from userspace. It is not enough to just flush
2033 * the quota file since if blocksize < pagesize, invalidation
2034 * of the cache could fail because of other unrelated dirty
2036 sync_filesystem(sb
);
2037 invalidate_bdev(sb
->s_bdev
);
2039 mutex_lock(&dqopt
->dqonoff_mutex
);
2040 if (sb_has_quota_loaded(sb
, type
)) {
2045 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2046 /* We don't want quota and atime on quota files (deadlocks
2047 * possible) Also nobody should write to the file - we use
2048 * special IO operations which ignore the immutable bit. */
2049 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
2050 oldflags
= inode
->i_flags
& (S_NOATIME
| S_IMMUTABLE
|
2052 inode
->i_flags
|= S_NOQUOTA
| S_NOATIME
| S_IMMUTABLE
;
2053 mutex_unlock(&inode
->i_mutex
);
2055 * When S_NOQUOTA is set, remove dquot references as no more
2056 * references can be added
2058 __dquot_drop(inode
);
2062 dqopt
->files
[type
] = igrab(inode
);
2063 if (!dqopt
->files
[type
])
2066 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
2069 dqopt
->ops
[type
] = fmt
->qf_ops
;
2070 dqopt
->info
[type
].dqi_format
= fmt
;
2071 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
2072 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
2073 mutex_lock(&dqopt
->dqio_mutex
);
2074 error
= dqopt
->ops
[type
]->read_file_info(sb
, type
);
2076 mutex_unlock(&dqopt
->dqio_mutex
);
2079 mutex_unlock(&dqopt
->dqio_mutex
);
2080 spin_lock(&dq_state_lock
);
2081 dqopt
->flags
|= dquot_state_flag(flags
, type
);
2082 spin_unlock(&dq_state_lock
);
2084 add_dquot_ref(sb
, type
);
2085 mutex_unlock(&dqopt
->dqonoff_mutex
);
2090 dqopt
->files
[type
] = NULL
;
2093 if (oldflags
!= -1) {
2094 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
2095 /* Set the flags back (in the case of accidental quotaon()
2096 * on a wrong file we don't want to mess up the flags) */
2097 inode
->i_flags
&= ~(S_NOATIME
| S_NOQUOTA
| S_IMMUTABLE
);
2098 inode
->i_flags
|= oldflags
;
2099 mutex_unlock(&inode
->i_mutex
);
2101 mutex_unlock(&dqopt
->dqonoff_mutex
);
2103 put_quota_format(fmt
);
2108 /* Reenable quotas on remount RW */
2109 static int vfs_quota_on_remount(struct super_block
*sb
, int type
)
2111 struct quota_info
*dqopt
= sb_dqopt(sb
);
2112 struct inode
*inode
;
2116 mutex_lock(&dqopt
->dqonoff_mutex
);
2117 if (!sb_has_quota_suspended(sb
, type
)) {
2118 mutex_unlock(&dqopt
->dqonoff_mutex
);
2121 inode
= dqopt
->files
[type
];
2122 dqopt
->files
[type
] = NULL
;
2123 spin_lock(&dq_state_lock
);
2124 flags
= dqopt
->flags
& dquot_state_flag(DQUOT_USAGE_ENABLED
|
2125 DQUOT_LIMITS_ENABLED
, type
);
2126 dqopt
->flags
&= ~dquot_state_flag(DQUOT_STATE_FLAGS
, type
);
2127 spin_unlock(&dq_state_lock
);
2128 mutex_unlock(&dqopt
->dqonoff_mutex
);
2130 flags
= dquot_generic_flag(flags
, type
);
2131 ret
= vfs_load_quota_inode(inode
, type
, dqopt
->info
[type
].dqi_fmt_id
,
2138 int vfs_quota_on_path(struct super_block
*sb
, int type
, int format_id
,
2141 int error
= security_quota_on(path
->dentry
);
2144 /* Quota file not on the same filesystem? */
2145 if (path
->mnt
->mnt_sb
!= sb
)
2148 error
= vfs_load_quota_inode(path
->dentry
->d_inode
, type
,
2149 format_id
, DQUOT_USAGE_ENABLED
|
2150 DQUOT_LIMITS_ENABLED
);
2153 EXPORT_SYMBOL(vfs_quota_on_path
);
2155 int vfs_quota_on(struct super_block
*sb
, int type
, int format_id
, char *name
,
2162 return vfs_quota_on_remount(sb
, type
);
2164 error
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
2166 error
= vfs_quota_on_path(sb
, type
, format_id
, &path
);
2171 EXPORT_SYMBOL(vfs_quota_on
);
2174 * More powerful function for turning on quotas allowing setting
2175 * of individual quota flags
2177 int vfs_quota_enable(struct inode
*inode
, int type
, int format_id
,
2181 struct super_block
*sb
= inode
->i_sb
;
2182 struct quota_info
*dqopt
= sb_dqopt(sb
);
2184 /* Just unsuspend quotas? */
2185 if (flags
& DQUOT_SUSPENDED
)
2186 return vfs_quota_on_remount(sb
, type
);
2189 /* Just updating flags needed? */
2190 if (sb_has_quota_loaded(sb
, type
)) {
2191 mutex_lock(&dqopt
->dqonoff_mutex
);
2192 /* Now do a reliable test... */
2193 if (!sb_has_quota_loaded(sb
, type
)) {
2194 mutex_unlock(&dqopt
->dqonoff_mutex
);
2197 if (flags
& DQUOT_USAGE_ENABLED
&&
2198 sb_has_quota_usage_enabled(sb
, type
)) {
2202 if (flags
& DQUOT_LIMITS_ENABLED
&&
2203 sb_has_quota_limits_enabled(sb
, type
)) {
2207 spin_lock(&dq_state_lock
);
2208 sb_dqopt(sb
)->flags
|= dquot_state_flag(flags
, type
);
2209 spin_unlock(&dq_state_lock
);
2211 mutex_unlock(&dqopt
->dqonoff_mutex
);
2216 return vfs_load_quota_inode(inode
, type
, format_id
, flags
);
2218 EXPORT_SYMBOL(vfs_quota_enable
);
2221 * This function is used when filesystem needs to initialize quotas
2222 * during mount time.
2224 int vfs_quota_on_mount(struct super_block
*sb
, char *qf_name
,
2225 int format_id
, int type
)
2227 struct dentry
*dentry
;
2230 mutex_lock(&sb
->s_root
->d_inode
->i_mutex
);
2231 dentry
= lookup_one_len(qf_name
, sb
->s_root
, strlen(qf_name
));
2232 mutex_unlock(&sb
->s_root
->d_inode
->i_mutex
);
2234 return PTR_ERR(dentry
);
2236 if (!dentry
->d_inode
) {
2241 error
= security_quota_on(dentry
);
2243 error
= vfs_load_quota_inode(dentry
->d_inode
, type
, format_id
,
2244 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2250 EXPORT_SYMBOL(vfs_quota_on_mount
);
2252 /* Wrapper to turn on quotas when remounting rw */
2253 int vfs_dq_quota_on_remount(struct super_block
*sb
)
2258 if (!sb
->s_qcop
|| !sb
->s_qcop
->quota_on
)
2260 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2261 err
= sb
->s_qcop
->quota_on(sb
, cnt
, 0, NULL
, 1);
2262 if (err
< 0 && !ret
)
2267 EXPORT_SYMBOL(vfs_dq_quota_on_remount
);
2269 static inline qsize_t
qbtos(qsize_t blocks
)
2271 return blocks
<< QIF_DQBLKSIZE_BITS
;
2274 static inline qsize_t
stoqb(qsize_t space
)
2276 return (space
+ QIF_DQBLKSIZE
- 1) >> QIF_DQBLKSIZE_BITS
;
2279 /* Generic routine for getting common part of quota structure */
2280 static void do_get_dqblk(struct dquot
*dquot
, struct if_dqblk
*di
)
2282 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2284 spin_lock(&dq_data_lock
);
2285 di
->dqb_bhardlimit
= stoqb(dm
->dqb_bhardlimit
);
2286 di
->dqb_bsoftlimit
= stoqb(dm
->dqb_bsoftlimit
);
2287 di
->dqb_curspace
= dm
->dqb_curspace
+ dm
->dqb_rsvspace
;
2288 di
->dqb_ihardlimit
= dm
->dqb_ihardlimit
;
2289 di
->dqb_isoftlimit
= dm
->dqb_isoftlimit
;
2290 di
->dqb_curinodes
= dm
->dqb_curinodes
;
2291 di
->dqb_btime
= dm
->dqb_btime
;
2292 di
->dqb_itime
= dm
->dqb_itime
;
2293 di
->dqb_valid
= QIF_ALL
;
2294 spin_unlock(&dq_data_lock
);
2297 int vfs_get_dqblk(struct super_block
*sb
, int type
, qid_t id
,
2298 struct if_dqblk
*di
)
2300 struct dquot
*dquot
;
2302 dquot
= dqget(sb
, id
, type
);
2305 do_get_dqblk(dquot
, di
);
2310 EXPORT_SYMBOL(vfs_get_dqblk
);
2312 /* Generic routine for setting common part of quota structure */
2313 static int do_set_dqblk(struct dquot
*dquot
, struct if_dqblk
*di
)
2315 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2316 int check_blim
= 0, check_ilim
= 0;
2317 struct mem_dqinfo
*dqi
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
2319 if ((di
->dqb_valid
& QIF_BLIMITS
&&
2320 (di
->dqb_bhardlimit
> dqi
->dqi_maxblimit
||
2321 di
->dqb_bsoftlimit
> dqi
->dqi_maxblimit
)) ||
2322 (di
->dqb_valid
& QIF_ILIMITS
&&
2323 (di
->dqb_ihardlimit
> dqi
->dqi_maxilimit
||
2324 di
->dqb_isoftlimit
> dqi
->dqi_maxilimit
)))
2327 spin_lock(&dq_data_lock
);
2328 if (di
->dqb_valid
& QIF_SPACE
) {
2329 dm
->dqb_curspace
= di
->dqb_curspace
- dm
->dqb_rsvspace
;
2331 set_bit(DQ_LASTSET_B
+ QIF_SPACE_B
, &dquot
->dq_flags
);
2333 if (di
->dqb_valid
& QIF_BLIMITS
) {
2334 dm
->dqb_bsoftlimit
= qbtos(di
->dqb_bsoftlimit
);
2335 dm
->dqb_bhardlimit
= qbtos(di
->dqb_bhardlimit
);
2337 set_bit(DQ_LASTSET_B
+ QIF_BLIMITS_B
, &dquot
->dq_flags
);
2339 if (di
->dqb_valid
& QIF_INODES
) {
2340 dm
->dqb_curinodes
= di
->dqb_curinodes
;
2342 set_bit(DQ_LASTSET_B
+ QIF_INODES_B
, &dquot
->dq_flags
);
2344 if (di
->dqb_valid
& QIF_ILIMITS
) {
2345 dm
->dqb_isoftlimit
= di
->dqb_isoftlimit
;
2346 dm
->dqb_ihardlimit
= di
->dqb_ihardlimit
;
2348 set_bit(DQ_LASTSET_B
+ QIF_ILIMITS_B
, &dquot
->dq_flags
);
2350 if (di
->dqb_valid
& QIF_BTIME
) {
2351 dm
->dqb_btime
= di
->dqb_btime
;
2353 set_bit(DQ_LASTSET_B
+ QIF_BTIME_B
, &dquot
->dq_flags
);
2355 if (di
->dqb_valid
& QIF_ITIME
) {
2356 dm
->dqb_itime
= di
->dqb_itime
;
2358 set_bit(DQ_LASTSET_B
+ QIF_ITIME_B
, &dquot
->dq_flags
);
2362 if (!dm
->dqb_bsoftlimit
||
2363 dm
->dqb_curspace
< dm
->dqb_bsoftlimit
) {
2365 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
2366 } else if (!(di
->dqb_valid
& QIF_BTIME
))
2367 /* Set grace only if user hasn't provided his own... */
2368 dm
->dqb_btime
= get_seconds() + dqi
->dqi_bgrace
;
2371 if (!dm
->dqb_isoftlimit
||
2372 dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
2374 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
2375 } else if (!(di
->dqb_valid
& QIF_ITIME
))
2376 /* Set grace only if user hasn't provided his own... */
2377 dm
->dqb_itime
= get_seconds() + dqi
->dqi_igrace
;
2379 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
||
2381 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2383 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2384 spin_unlock(&dq_data_lock
);
2385 mark_dquot_dirty(dquot
);
2390 int vfs_set_dqblk(struct super_block
*sb
, int type
, qid_t id
,
2391 struct if_dqblk
*di
)
2393 struct dquot
*dquot
;
2396 dquot
= dqget(sb
, id
, type
);
2401 rc
= do_set_dqblk(dquot
, di
);
2406 EXPORT_SYMBOL(vfs_set_dqblk
);
2408 /* Generic routine for getting common part of quota file information */
2409 int vfs_get_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2411 struct mem_dqinfo
*mi
;
2413 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2414 if (!sb_has_quota_active(sb
, type
)) {
2415 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2418 mi
= sb_dqopt(sb
)->info
+ type
;
2419 spin_lock(&dq_data_lock
);
2420 ii
->dqi_bgrace
= mi
->dqi_bgrace
;
2421 ii
->dqi_igrace
= mi
->dqi_igrace
;
2422 ii
->dqi_flags
= mi
->dqi_flags
& DQF_MASK
;
2423 ii
->dqi_valid
= IIF_ALL
;
2424 spin_unlock(&dq_data_lock
);
2425 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2428 EXPORT_SYMBOL(vfs_get_dqinfo
);
2430 /* Generic routine for setting common part of quota file information */
2431 int vfs_set_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2433 struct mem_dqinfo
*mi
;
2436 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2437 if (!sb_has_quota_active(sb
, type
)) {
2441 mi
= sb_dqopt(sb
)->info
+ type
;
2442 spin_lock(&dq_data_lock
);
2443 if (ii
->dqi_valid
& IIF_BGRACE
)
2444 mi
->dqi_bgrace
= ii
->dqi_bgrace
;
2445 if (ii
->dqi_valid
& IIF_IGRACE
)
2446 mi
->dqi_igrace
= ii
->dqi_igrace
;
2447 if (ii
->dqi_valid
& IIF_FLAGS
)
2448 mi
->dqi_flags
= (mi
->dqi_flags
& ~DQF_MASK
) |
2449 (ii
->dqi_flags
& DQF_MASK
);
2450 spin_unlock(&dq_data_lock
);
2451 mark_info_dirty(sb
, type
);
2452 /* Force write to disk */
2453 sb
->dq_op
->write_info(sb
, type
);
2455 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2458 EXPORT_SYMBOL(vfs_set_dqinfo
);
2460 const struct quotactl_ops vfs_quotactl_ops
= {
2461 .quota_on
= vfs_quota_on
,
2462 .quota_off
= vfs_quota_off
,
2463 .quota_sync
= vfs_quota_sync
,
2464 .get_info
= vfs_get_dqinfo
,
2465 .set_info
= vfs_set_dqinfo
,
2466 .get_dqblk
= vfs_get_dqblk
,
2467 .set_dqblk
= vfs_set_dqblk
2470 static ctl_table fs_dqstats_table
[] = {
2472 .procname
= "lookups",
2473 .data
= &dqstats
.lookups
,
2474 .maxlen
= sizeof(int),
2476 .proc_handler
= proc_dointvec
,
2479 .procname
= "drops",
2480 .data
= &dqstats
.drops
,
2481 .maxlen
= sizeof(int),
2483 .proc_handler
= proc_dointvec
,
2486 .procname
= "reads",
2487 .data
= &dqstats
.reads
,
2488 .maxlen
= sizeof(int),
2490 .proc_handler
= proc_dointvec
,
2493 .procname
= "writes",
2494 .data
= &dqstats
.writes
,
2495 .maxlen
= sizeof(int),
2497 .proc_handler
= proc_dointvec
,
2500 .procname
= "cache_hits",
2501 .data
= &dqstats
.cache_hits
,
2502 .maxlen
= sizeof(int),
2504 .proc_handler
= proc_dointvec
,
2507 .procname
= "allocated_dquots",
2508 .data
= &dqstats
.allocated_dquots
,
2509 .maxlen
= sizeof(int),
2511 .proc_handler
= proc_dointvec
,
2514 .procname
= "free_dquots",
2515 .data
= &dqstats
.free_dquots
,
2516 .maxlen
= sizeof(int),
2518 .proc_handler
= proc_dointvec
,
2521 .procname
= "syncs",
2522 .data
= &dqstats
.syncs
,
2523 .maxlen
= sizeof(int),
2525 .proc_handler
= proc_dointvec
,
2527 #ifdef CONFIG_PRINT_QUOTA_WARNING
2529 .procname
= "warnings",
2530 .data
= &flag_print_warnings
,
2531 .maxlen
= sizeof(int),
2533 .proc_handler
= proc_dointvec
,
2539 static ctl_table fs_table
[] = {
2541 .procname
= "quota",
2543 .child
= fs_dqstats_table
,
2548 static ctl_table sys_table
[] = {
2557 static int __init
dquot_init(void)
2560 unsigned long nr_hash
, order
;
2562 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2564 register_sysctl_table(sys_table
);
2566 dquot_cachep
= kmem_cache_create("dquot",
2567 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2568 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2569 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2573 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
2575 panic("Cannot create dquot hash table");
2577 /* Find power-of-two hlist_heads which can fit into allocation */
2578 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2582 } while (nr_hash
>> dq_hash_bits
);
2585 nr_hash
= 1UL << dq_hash_bits
;
2586 dq_hash_mask
= nr_hash
- 1;
2587 for (i
= 0; i
< nr_hash
; i
++)
2588 INIT_HLIST_HEAD(dquot_hash
+ i
);
2590 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2591 nr_hash
, order
, (PAGE_SIZE
<< order
));
2593 register_shrinker(&dqcache_shrinker
);
2597 module_init(dquot_init
);