2 * Implementation of the diskquota system for the LINUX operating system. QUOTA
3 * is implemented using the BSD system call interface as the means of
4 * communication with the user level. This file contains the generic routines
5 * called by the different filesystems on allocation of an inode or block.
6 * These routines take care of the administration needed to have a consistent
7 * diskquota tracking system. The ideas of both user and group quotas are based
8 * on the Melbourne quota system as used on BSD derived systems. The internal
9 * implementation is based on one of the several variants of the LINUX
10 * inode-subsystem with added complexity of the diskquota system.
12 * Author: Marco van Wieringen <mvw@planets.elm.net>
14 * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
16 * Revised list management to avoid races
17 * -- Bill Hawes, <whawes@star.net>, 9/98
19 * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
20 * As the consequence the locking was moved from dquot_decr_...(),
21 * dquot_incr_...() to calling functions.
22 * invalidate_dquots() now writes modified dquots.
23 * Serialized quota_off() and quota_on() for mount point.
24 * Fixed a few bugs in grow_dquots().
25 * Fixed deadlock in write_dquot() - we no longer account quotas on
27 * remove_dquot_ref() moved to inode.c - it now traverses through inodes
28 * add_dquot_ref() restarts after blocking
29 * Added check for bogus uid and fixed check for group in quotactl.
30 * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
32 * Used struct list_head instead of own list struct
33 * Invalidation of referenced dquots is no longer possible
34 * Improved free_dquots list management
35 * Quota and i_blocks are now updated in one place to avoid races
36 * Warnings are now delayed so we won't block in critical section
37 * Write updated not to require dquot lock
38 * Jan Kara, <jack@suse.cz>, 9/2000
40 * Added dynamic quota structure allocation
41 * Jan Kara <jack@suse.cz> 12/2000
43 * Rewritten quota interface. Implemented new quota format and
44 * formats registering.
45 * Jan Kara, <jack@suse.cz>, 2001,2002
48 * Jan Kara, <jack@suse.cz>, 10/2002
50 * Added journalled quota support, fix lock inversion problems
51 * Jan Kara, <jack@suse.cz>, 2003,2004
53 * (C) Copyright 1994 - 1997 Marco van Wieringen
56 #include <linux/errno.h>
57 #include <linux/kernel.h>
59 #include <linux/mount.h>
61 #include <linux/time.h>
62 #include <linux/types.h>
63 #include <linux/string.h>
64 #include <linux/fcntl.h>
65 #include <linux/stat.h>
66 #include <linux/tty.h>
67 #include <linux/file.h>
68 #include <linux/slab.h>
69 #include <linux/sysctl.h>
70 #include <linux/init.h>
71 #include <linux/module.h>
72 #include <linux/proc_fs.h>
73 #include <linux/security.h>
74 #include <linux/sched.h>
75 #include <linux/kmod.h>
76 #include <linux/namei.h>
77 #include <linux/capability.h>
78 #include <linux/quotaops.h>
79 #include "../internal.h" /* ugh */
81 #include <linux/uaccess.h>
84 * There are three quota SMP locks. dq_list_lock protects all lists with quotas
86 * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
87 * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
88 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
89 * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
90 * modifications of quota state (on quotaon and quotaoff) and readers who care
91 * about latest values take it as well.
93 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
94 * dq_list_lock > dq_state_lock
96 * Note that some things (eg. sb pointer, type, id) doesn't change during
97 * the life of the dquot structure and so needn't to be protected by a lock
99 * Any operation working on dquots via inode pointers must hold dqptr_sem. If
100 * operation is just reading pointers from inode (or not using them at all) the
101 * read lock is enough. If pointers are altered function must hold write lock.
102 * Special care needs to be taken about S_NOQUOTA inode flag (marking that
103 * inode is a quota file). Functions adding pointers from inode to dquots have
104 * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they
105 * have to do all pointer modifications before dropping dqptr_sem. This makes
106 * sure they cannot race with quotaon which first sets S_NOQUOTA flag and
107 * then drops all pointers to dquots from an inode.
109 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
110 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
111 * Currently dquot is locked only when it is being read to memory (or space for
112 * it is being allocated) on the first dqget() and when it is being released on
113 * the last dqput(). The allocation and release oparations are serialized by
114 * the dq_lock and by checking the use count in dquot_release(). Write
115 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
116 * spinlock to internal buffers before writing.
118 * Lock ordering (including related VFS locks) is the following:
119 * dqonoff_mutex > i_mutex > journal_lock > dqptr_sem > dquot->dq_lock >
121 * dqonoff_mutex > i_mutex comes from dquot_quota_sync, dquot_enable, etc.
122 * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
123 * dqptr_sem. But filesystem has to count with the fact that functions such as
124 * dquot_alloc_space() acquire dqptr_sem and they usually have to be called
125 * from inside a transaction to keep filesystem consistency after a crash. Also
126 * filesystems usually want to do some IO on dquot from ->mark_dirty which is
127 * called with dqptr_sem held.
130 static __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_list_lock
);
131 static __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_state_lock
);
132 __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_data_lock
);
133 EXPORT_SYMBOL(dq_data_lock
);
135 void __quota_error(struct super_block
*sb
, const char *func
,
136 const char *fmt
, ...)
138 if (printk_ratelimit()) {
140 struct va_format vaf
;
147 printk(KERN_ERR
"Quota error (device %s): %s: %pV\n",
148 sb
->s_id
, func
, &vaf
);
153 EXPORT_SYMBOL(__quota_error
);
155 #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING)
156 static char *quotatypes
[] = INITQFNAMES
;
158 static struct quota_format_type
*quota_formats
; /* List of registered formats */
159 static struct quota_module_name module_names
[] = INIT_QUOTA_MODULE_NAMES
;
161 /* SLAB cache for dquot structures */
162 static struct kmem_cache
*dquot_cachep
;
164 int register_quota_format(struct quota_format_type
*fmt
)
166 spin_lock(&dq_list_lock
);
167 fmt
->qf_next
= quota_formats
;
169 spin_unlock(&dq_list_lock
);
172 EXPORT_SYMBOL(register_quota_format
);
174 void unregister_quota_format(struct quota_format_type
*fmt
)
176 struct quota_format_type
**actqf
;
178 spin_lock(&dq_list_lock
);
179 for (actqf
= "a_formats
; *actqf
&& *actqf
!= fmt
;
180 actqf
= &(*actqf
)->qf_next
)
183 *actqf
= (*actqf
)->qf_next
;
184 spin_unlock(&dq_list_lock
);
186 EXPORT_SYMBOL(unregister_quota_format
);
188 static struct quota_format_type
*find_quota_format(int id
)
190 struct quota_format_type
*actqf
;
192 spin_lock(&dq_list_lock
);
193 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
194 actqf
= actqf
->qf_next
)
196 if (!actqf
|| !try_module_get(actqf
->qf_owner
)) {
199 spin_unlock(&dq_list_lock
);
201 for (qm
= 0; module_names
[qm
].qm_fmt_id
&&
202 module_names
[qm
].qm_fmt_id
!= id
; qm
++)
204 if (!module_names
[qm
].qm_fmt_id
||
205 request_module(module_names
[qm
].qm_mod_name
))
208 spin_lock(&dq_list_lock
);
209 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
210 actqf
= actqf
->qf_next
)
212 if (actqf
&& !try_module_get(actqf
->qf_owner
))
215 spin_unlock(&dq_list_lock
);
219 static void put_quota_format(struct quota_format_type
*fmt
)
221 module_put(fmt
->qf_owner
);
225 * Dquot List Management:
226 * The quota code uses three lists for dquot management: the inuse_list,
227 * free_dquots, and dquot_hash[] array. A single dquot structure may be
228 * on all three lists, depending on its current state.
230 * All dquots are placed to the end of inuse_list when first created, and this
231 * list is used for invalidate operation, which must look at every dquot.
233 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
234 * and this list is searched whenever we need an available dquot. Dquots are
235 * removed from the list as soon as they are used again, and
236 * dqstats.free_dquots gives the number of dquots on the list. When
237 * dquot is invalidated it's completely released from memory.
239 * Dquots with a specific identity (device, type and id) are placed on
240 * one of the dquot_hash[] hash chains. The provides an efficient search
241 * mechanism to locate a specific dquot.
244 static LIST_HEAD(inuse_list
);
245 static LIST_HEAD(free_dquots
);
246 static unsigned int dq_hash_bits
, dq_hash_mask
;
247 static struct hlist_head
*dquot_hash
;
249 struct dqstats dqstats
;
250 EXPORT_SYMBOL(dqstats
);
252 static qsize_t
inode_get_rsv_space(struct inode
*inode
);
253 static void __dquot_initialize(struct inode
*inode
, int type
);
255 static inline unsigned int
256 hashfn(const struct super_block
*sb
, struct kqid qid
)
258 unsigned int id
= from_kqid(&init_user_ns
, qid
);
262 tmp
= (((unsigned long)sb
>>L1_CACHE_SHIFT
) ^ id
) * (MAXQUOTAS
- type
);
263 return (tmp
+ (tmp
>> dq_hash_bits
)) & dq_hash_mask
;
267 * Following list functions expect dq_list_lock to be held
269 static inline void insert_dquot_hash(struct dquot
*dquot
)
271 struct hlist_head
*head
;
272 head
= dquot_hash
+ hashfn(dquot
->dq_sb
, dquot
->dq_id
);
273 hlist_add_head(&dquot
->dq_hash
, head
);
276 static inline void remove_dquot_hash(struct dquot
*dquot
)
278 hlist_del_init(&dquot
->dq_hash
);
281 static struct dquot
*find_dquot(unsigned int hashent
, struct super_block
*sb
,
284 struct hlist_node
*node
;
287 hlist_for_each (node
, dquot_hash
+hashent
) {
288 dquot
= hlist_entry(node
, struct dquot
, dq_hash
);
289 if (dquot
->dq_sb
== sb
&& qid_eq(dquot
->dq_id
, qid
))
295 /* Add a dquot to the tail of the free list */
296 static inline void put_dquot_last(struct dquot
*dquot
)
298 list_add_tail(&dquot
->dq_free
, &free_dquots
);
299 dqstats_inc(DQST_FREE_DQUOTS
);
302 static inline void remove_free_dquot(struct dquot
*dquot
)
304 if (list_empty(&dquot
->dq_free
))
306 list_del_init(&dquot
->dq_free
);
307 dqstats_dec(DQST_FREE_DQUOTS
);
310 static inline void put_inuse(struct dquot
*dquot
)
312 /* We add to the back of inuse list so we don't have to restart
313 * when traversing this list and we block */
314 list_add_tail(&dquot
->dq_inuse
, &inuse_list
);
315 dqstats_inc(DQST_ALLOC_DQUOTS
);
318 static inline void remove_inuse(struct dquot
*dquot
)
320 dqstats_dec(DQST_ALLOC_DQUOTS
);
321 list_del(&dquot
->dq_inuse
);
324 * End of list functions needing dq_list_lock
327 static void wait_on_dquot(struct dquot
*dquot
)
329 mutex_lock(&dquot
->dq_lock
);
330 mutex_unlock(&dquot
->dq_lock
);
333 static inline int dquot_dirty(struct dquot
*dquot
)
335 return test_bit(DQ_MOD_B
, &dquot
->dq_flags
);
338 static inline int mark_dquot_dirty(struct dquot
*dquot
)
340 return dquot
->dq_sb
->dq_op
->mark_dirty(dquot
);
343 /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */
344 int dquot_mark_dquot_dirty(struct dquot
*dquot
)
348 /* If quota is dirty already, we don't have to acquire dq_list_lock */
349 if (test_bit(DQ_MOD_B
, &dquot
->dq_flags
))
352 spin_lock(&dq_list_lock
);
353 if (!test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
)) {
354 list_add(&dquot
->dq_dirty
, &sb_dqopt(dquot
->dq_sb
)->
355 info
[dquot
->dq_id
.type
].dqi_dirty_list
);
358 spin_unlock(&dq_list_lock
);
361 EXPORT_SYMBOL(dquot_mark_dquot_dirty
);
363 /* Dirtify all the dquots - this can block when journalling */
364 static inline int mark_all_dquot_dirty(struct dquot
* const *dquot
)
369 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
371 /* Even in case of error we have to continue */
372 ret
= mark_dquot_dirty(dquot
[cnt
]);
379 static inline void dqput_all(struct dquot
**dquot
)
383 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
387 /* This function needs dq_list_lock */
388 static inline int clear_dquot_dirty(struct dquot
*dquot
)
390 if (!test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
))
392 list_del_init(&dquot
->dq_dirty
);
396 void mark_info_dirty(struct super_block
*sb
, int type
)
398 set_bit(DQF_INFO_DIRTY_B
, &sb_dqopt(sb
)->info
[type
].dqi_flags
);
400 EXPORT_SYMBOL(mark_info_dirty
);
403 * Read dquot from disk and alloc space for it
406 int dquot_acquire(struct dquot
*dquot
)
408 int ret
= 0, ret2
= 0;
409 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
411 mutex_lock(&dquot
->dq_lock
);
412 mutex_lock(&dqopt
->dqio_mutex
);
413 if (!test_bit(DQ_READ_B
, &dquot
->dq_flags
))
414 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->read_dqblk(dquot
);
417 set_bit(DQ_READ_B
, &dquot
->dq_flags
);
418 /* Instantiate dquot if needed */
419 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && !dquot
->dq_off
) {
420 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->commit_dqblk(dquot
);
421 /* Write the info if needed */
422 if (info_dirty(&dqopt
->info
[dquot
->dq_id
.type
])) {
423 ret2
= dqopt
->ops
[dquot
->dq_id
.type
]->write_file_info(
424 dquot
->dq_sb
, dquot
->dq_id
.type
);
433 set_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
435 mutex_unlock(&dqopt
->dqio_mutex
);
436 mutex_unlock(&dquot
->dq_lock
);
439 EXPORT_SYMBOL(dquot_acquire
);
442 * Write dquot to disk
444 int dquot_commit(struct dquot
*dquot
)
447 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
449 mutex_lock(&dqopt
->dqio_mutex
);
450 spin_lock(&dq_list_lock
);
451 if (!clear_dquot_dirty(dquot
)) {
452 spin_unlock(&dq_list_lock
);
455 spin_unlock(&dq_list_lock
);
456 /* Inactive dquot can be only if there was error during read/init
457 * => we have better not writing it */
458 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
459 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->commit_dqblk(dquot
);
463 mutex_unlock(&dqopt
->dqio_mutex
);
466 EXPORT_SYMBOL(dquot_commit
);
471 int dquot_release(struct dquot
*dquot
)
473 int ret
= 0, ret2
= 0;
474 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
476 mutex_lock(&dquot
->dq_lock
);
477 /* Check whether we are not racing with some other dqget() */
478 if (atomic_read(&dquot
->dq_count
) > 1)
480 mutex_lock(&dqopt
->dqio_mutex
);
481 if (dqopt
->ops
[dquot
->dq_id
.type
]->release_dqblk
) {
482 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->release_dqblk(dquot
);
484 if (info_dirty(&dqopt
->info
[dquot
->dq_id
.type
])) {
485 ret2
= dqopt
->ops
[dquot
->dq_id
.type
]->write_file_info(
486 dquot
->dq_sb
, dquot
->dq_id
.type
);
491 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
492 mutex_unlock(&dqopt
->dqio_mutex
);
494 mutex_unlock(&dquot
->dq_lock
);
497 EXPORT_SYMBOL(dquot_release
);
499 void dquot_destroy(struct dquot
*dquot
)
501 kmem_cache_free(dquot_cachep
, dquot
);
503 EXPORT_SYMBOL(dquot_destroy
);
505 static inline void do_destroy_dquot(struct dquot
*dquot
)
507 dquot
->dq_sb
->dq_op
->destroy_dquot(dquot
);
510 /* Invalidate all dquots on the list. Note that this function is called after
511 * quota is disabled and pointers from inodes removed so there cannot be new
512 * quota users. There can still be some users of quotas due to inodes being
513 * just deleted or pruned by prune_icache() (those are not attached to any
514 * list) or parallel quotactl call. We have to wait for such users.
516 static void invalidate_dquots(struct super_block
*sb
, int type
)
518 struct dquot
*dquot
, *tmp
;
521 spin_lock(&dq_list_lock
);
522 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
523 if (dquot
->dq_sb
!= sb
)
525 if (dquot
->dq_id
.type
!= type
)
527 /* Wait for dquot users */
528 if (atomic_read(&dquot
->dq_count
)) {
532 prepare_to_wait(&dquot
->dq_wait_unused
, &wait
,
533 TASK_UNINTERRUPTIBLE
);
534 spin_unlock(&dq_list_lock
);
535 /* Once dqput() wakes us up, we know it's time to free
537 * IMPORTANT: we rely on the fact that there is always
538 * at most one process waiting for dquot to free.
539 * Otherwise dq_count would be > 1 and we would never
542 if (atomic_read(&dquot
->dq_count
) > 1)
544 finish_wait(&dquot
->dq_wait_unused
, &wait
);
546 /* At this moment dquot() need not exist (it could be
547 * reclaimed by prune_dqcache(). Hence we must
552 * Quota now has no users and it has been written on last
555 remove_dquot_hash(dquot
);
556 remove_free_dquot(dquot
);
558 do_destroy_dquot(dquot
);
560 spin_unlock(&dq_list_lock
);
563 /* Call callback for every active dquot on given filesystem */
564 int dquot_scan_active(struct super_block
*sb
,
565 int (*fn
)(struct dquot
*dquot
, unsigned long priv
),
568 struct dquot
*dquot
, *old_dquot
= NULL
;
571 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
572 spin_lock(&dq_list_lock
);
573 list_for_each_entry(dquot
, &inuse_list
, dq_inuse
) {
574 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
576 if (dquot
->dq_sb
!= sb
)
578 /* Now we have active dquot so we can just increase use count */
579 atomic_inc(&dquot
->dq_count
);
580 spin_unlock(&dq_list_lock
);
581 dqstats_inc(DQST_LOOKUPS
);
585 * ->release_dquot() can be racing with us. Our reference
586 * protects us from new calls to it so just wait for any
587 * outstanding call and recheck the DQ_ACTIVE_B after that.
589 wait_on_dquot(dquot
);
590 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
591 ret
= fn(dquot
, priv
);
595 spin_lock(&dq_list_lock
);
596 /* We are safe to continue now because our dquot could not
597 * be moved out of the inuse list while we hold the reference */
599 spin_unlock(&dq_list_lock
);
602 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
605 EXPORT_SYMBOL(dquot_scan_active
);
607 /* Write all dquot structures to quota files */
608 int dquot_writeback_dquots(struct super_block
*sb
, int type
)
610 struct list_head
*dirty
;
612 struct quota_info
*dqopt
= sb_dqopt(sb
);
616 mutex_lock(&dqopt
->dqonoff_mutex
);
617 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
618 if (type
!= -1 && cnt
!= type
)
620 if (!sb_has_quota_active(sb
, cnt
))
622 spin_lock(&dq_list_lock
);
623 dirty
= &dqopt
->info
[cnt
].dqi_dirty_list
;
624 while (!list_empty(dirty
)) {
625 dquot
= list_first_entry(dirty
, struct dquot
,
627 /* Dirty and inactive can be only bad dquot... */
628 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
629 clear_dquot_dirty(dquot
);
632 /* Now we have active dquot from which someone is
633 * holding reference so we can safely just increase
636 spin_unlock(&dq_list_lock
);
637 dqstats_inc(DQST_LOOKUPS
);
638 err
= sb
->dq_op
->write_dquot(dquot
);
642 spin_lock(&dq_list_lock
);
644 spin_unlock(&dq_list_lock
);
647 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
648 if ((cnt
== type
|| type
== -1) && sb_has_quota_active(sb
, cnt
)
649 && info_dirty(&dqopt
->info
[cnt
]))
650 sb
->dq_op
->write_info(sb
, cnt
);
651 dqstats_inc(DQST_SYNCS
);
652 mutex_unlock(&dqopt
->dqonoff_mutex
);
656 EXPORT_SYMBOL(dquot_writeback_dquots
);
658 /* Write all dquot structures to disk and make them visible from userspace */
659 int dquot_quota_sync(struct super_block
*sb
, int type
)
661 struct quota_info
*dqopt
= sb_dqopt(sb
);
665 ret
= dquot_writeback_dquots(sb
, type
);
668 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
671 /* This is not very clever (and fast) but currently I don't know about
672 * any other simple way of getting quota data to disk and we must get
673 * them there for userspace to be visible... */
674 if (sb
->s_op
->sync_fs
)
675 sb
->s_op
->sync_fs(sb
, 1);
676 sync_blockdev(sb
->s_bdev
);
679 * Now when everything is written we can discard the pagecache so
680 * that userspace sees the changes.
682 mutex_lock(&dqopt
->dqonoff_mutex
);
683 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
684 if (type
!= -1 && cnt
!= type
)
686 if (!sb_has_quota_active(sb
, cnt
))
688 mutex_lock(&dqopt
->files
[cnt
]->i_mutex
);
689 truncate_inode_pages(&dqopt
->files
[cnt
]->i_data
, 0);
690 mutex_unlock(&dqopt
->files
[cnt
]->i_mutex
);
692 mutex_unlock(&dqopt
->dqonoff_mutex
);
696 EXPORT_SYMBOL(dquot_quota_sync
);
699 dqcache_shrink_scan(struct shrinker
*shrink
, struct shrink_control
*sc
)
701 struct list_head
*head
;
703 unsigned long freed
= 0;
705 spin_lock(&dq_list_lock
);
706 head
= free_dquots
.prev
;
707 while (head
!= &free_dquots
&& sc
->nr_to_scan
) {
708 dquot
= list_entry(head
, struct dquot
, dq_free
);
709 remove_dquot_hash(dquot
);
710 remove_free_dquot(dquot
);
712 do_destroy_dquot(dquot
);
715 head
= free_dquots
.prev
;
717 spin_unlock(&dq_list_lock
);
722 dqcache_shrink_count(struct shrinker
*shrink
, struct shrink_control
*sc
)
724 return vfs_pressure_ratio(
725 percpu_counter_read_positive(&dqstats
.counter
[DQST_FREE_DQUOTS
]));
728 static struct shrinker dqcache_shrinker
= {
729 .count_objects
= dqcache_shrink_count
,
730 .scan_objects
= dqcache_shrink_scan
,
731 .seeks
= DEFAULT_SEEKS
,
735 * Put reference to dquot
736 * NOTE: If you change this function please check whether dqput_blocks() works right...
738 void dqput(struct dquot
*dquot
)
744 #ifdef CONFIG_QUOTA_DEBUG
745 if (!atomic_read(&dquot
->dq_count
)) {
746 quota_error(dquot
->dq_sb
, "trying to free free dquot of %s %d",
747 quotatypes
[dquot
->dq_id
.type
],
748 from_kqid(&init_user_ns
, dquot
->dq_id
));
752 dqstats_inc(DQST_DROPS
);
754 spin_lock(&dq_list_lock
);
755 if (atomic_read(&dquot
->dq_count
) > 1) {
756 /* We have more than one user... nothing to do */
757 atomic_dec(&dquot
->dq_count
);
758 /* Releasing dquot during quotaoff phase? */
759 if (!sb_has_quota_active(dquot
->dq_sb
, dquot
->dq_id
.type
) &&
760 atomic_read(&dquot
->dq_count
) == 1)
761 wake_up(&dquot
->dq_wait_unused
);
762 spin_unlock(&dq_list_lock
);
765 /* Need to release dquot? */
766 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && dquot_dirty(dquot
)) {
767 spin_unlock(&dq_list_lock
);
768 /* Commit dquot before releasing */
769 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
771 quota_error(dquot
->dq_sb
, "Can't write quota structure"
772 " (error %d). Quota may get out of sync!",
775 * We clear dirty bit anyway, so that we avoid
778 spin_lock(&dq_list_lock
);
779 clear_dquot_dirty(dquot
);
780 spin_unlock(&dq_list_lock
);
784 /* Clear flag in case dquot was inactive (something bad happened) */
785 clear_dquot_dirty(dquot
);
786 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
787 spin_unlock(&dq_list_lock
);
788 dquot
->dq_sb
->dq_op
->release_dquot(dquot
);
791 atomic_dec(&dquot
->dq_count
);
792 #ifdef CONFIG_QUOTA_DEBUG
794 BUG_ON(!list_empty(&dquot
->dq_free
));
796 put_dquot_last(dquot
);
797 spin_unlock(&dq_list_lock
);
799 EXPORT_SYMBOL(dqput
);
801 struct dquot
*dquot_alloc(struct super_block
*sb
, int type
)
803 return kmem_cache_zalloc(dquot_cachep
, GFP_NOFS
);
805 EXPORT_SYMBOL(dquot_alloc
);
807 static struct dquot
*get_empty_dquot(struct super_block
*sb
, int type
)
811 dquot
= sb
->dq_op
->alloc_dquot(sb
, type
);
815 mutex_init(&dquot
->dq_lock
);
816 INIT_LIST_HEAD(&dquot
->dq_free
);
817 INIT_LIST_HEAD(&dquot
->dq_inuse
);
818 INIT_HLIST_NODE(&dquot
->dq_hash
);
819 INIT_LIST_HEAD(&dquot
->dq_dirty
);
820 init_waitqueue_head(&dquot
->dq_wait_unused
);
822 dquot
->dq_id
= make_kqid_invalid(type
);
823 atomic_set(&dquot
->dq_count
, 1);
829 * Get reference to dquot
831 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
832 * destroying our dquot by:
833 * a) checking for quota flags under dq_list_lock and
834 * b) getting a reference to dquot before we release dq_list_lock
836 struct dquot
*dqget(struct super_block
*sb
, struct kqid qid
)
838 unsigned int hashent
= hashfn(sb
, qid
);
839 struct dquot
*dquot
= NULL
, *empty
= NULL
;
841 if (!sb_has_quota_active(sb
, qid
.type
))
844 spin_lock(&dq_list_lock
);
845 spin_lock(&dq_state_lock
);
846 if (!sb_has_quota_active(sb
, qid
.type
)) {
847 spin_unlock(&dq_state_lock
);
848 spin_unlock(&dq_list_lock
);
851 spin_unlock(&dq_state_lock
);
853 dquot
= find_dquot(hashent
, sb
, qid
);
856 spin_unlock(&dq_list_lock
);
857 empty
= get_empty_dquot(sb
, qid
.type
);
859 schedule(); /* Try to wait for a moment... */
865 /* all dquots go on the inuse_list */
867 /* hash it first so it can be found */
868 insert_dquot_hash(dquot
);
869 spin_unlock(&dq_list_lock
);
870 dqstats_inc(DQST_LOOKUPS
);
872 if (!atomic_read(&dquot
->dq_count
))
873 remove_free_dquot(dquot
);
874 atomic_inc(&dquot
->dq_count
);
875 spin_unlock(&dq_list_lock
);
876 dqstats_inc(DQST_CACHE_HITS
);
877 dqstats_inc(DQST_LOOKUPS
);
879 /* Wait for dq_lock - after this we know that either dquot_release() is
880 * already finished or it will be canceled due to dq_count > 1 test */
881 wait_on_dquot(dquot
);
882 /* Read the dquot / allocate space in quota file */
883 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) &&
884 sb
->dq_op
->acquire_dquot(dquot
) < 0) {
889 #ifdef CONFIG_QUOTA_DEBUG
890 BUG_ON(!dquot
->dq_sb
); /* Has somebody invalidated entry under us? */
894 do_destroy_dquot(empty
);
898 EXPORT_SYMBOL(dqget
);
900 static int dqinit_needed(struct inode
*inode
, int type
)
904 if (IS_NOQUOTA(inode
))
907 return !inode
->i_dquot
[type
];
908 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
909 if (!inode
->i_dquot
[cnt
])
914 /* This routine is guarded by dqonoff_mutex mutex */
915 static void add_dquot_ref(struct super_block
*sb
, int type
)
917 struct inode
*inode
, *old_inode
= NULL
;
918 #ifdef CONFIG_QUOTA_DEBUG
922 spin_lock(&inode_sb_list_lock
);
923 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
924 spin_lock(&inode
->i_lock
);
925 if ((inode
->i_state
& (I_FREEING
|I_WILL_FREE
|I_NEW
)) ||
926 !atomic_read(&inode
->i_writecount
) ||
927 !dqinit_needed(inode
, type
)) {
928 spin_unlock(&inode
->i_lock
);
932 spin_unlock(&inode
->i_lock
);
933 spin_unlock(&inode_sb_list_lock
);
935 #ifdef CONFIG_QUOTA_DEBUG
936 if (unlikely(inode_get_rsv_space(inode
) > 0))
940 __dquot_initialize(inode
, type
);
943 * We hold a reference to 'inode' so it couldn't have been
944 * removed from s_inodes list while we dropped the
945 * inode_sb_list_lock We cannot iput the inode now as we can be
946 * holding the last reference and we cannot iput it under
947 * inode_sb_list_lock. So we keep the reference and iput it
951 spin_lock(&inode_sb_list_lock
);
953 spin_unlock(&inode_sb_list_lock
);
956 #ifdef CONFIG_QUOTA_DEBUG
958 quota_error(sb
, "Writes happened before quota was turned on "
959 "thus quota information is probably inconsistent. "
960 "Please run quotacheck(8)");
966 * Return 0 if dqput() won't block.
967 * (note that 1 doesn't necessarily mean blocking)
969 static inline int dqput_blocks(struct dquot
*dquot
)
971 if (atomic_read(&dquot
->dq_count
) <= 1)
977 * Remove references to dquots from inode and add dquot to list for freeing
978 * if we have the last reference to dquot
979 * We can't race with anybody because we hold dqptr_sem for writing...
981 static int remove_inode_dquot_ref(struct inode
*inode
, int type
,
982 struct list_head
*tofree_head
)
984 struct dquot
*dquot
= inode
->i_dquot
[type
];
986 inode
->i_dquot
[type
] = NULL
;
988 if (dqput_blocks(dquot
)) {
989 #ifdef CONFIG_QUOTA_DEBUG
990 if (atomic_read(&dquot
->dq_count
) != 1)
991 quota_error(inode
->i_sb
, "Adding dquot with "
992 "dq_count %d to dispose list",
993 atomic_read(&dquot
->dq_count
));
995 spin_lock(&dq_list_lock
);
996 /* As dquot must have currently users it can't be on
997 * the free list... */
998 list_add(&dquot
->dq_free
, tofree_head
);
999 spin_unlock(&dq_list_lock
);
1003 dqput(dquot
); /* We have guaranteed we won't block */
1009 * Free list of dquots
1010 * Dquots are removed from inodes and no new references can be got so we are
1011 * the only ones holding reference
1013 static void put_dquot_list(struct list_head
*tofree_head
)
1015 struct list_head
*act_head
;
1016 struct dquot
*dquot
;
1018 act_head
= tofree_head
->next
;
1019 while (act_head
!= tofree_head
) {
1020 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
1021 act_head
= act_head
->next
;
1022 /* Remove dquot from the list so we won't have problems... */
1023 list_del_init(&dquot
->dq_free
);
1028 static void remove_dquot_ref(struct super_block
*sb
, int type
,
1029 struct list_head
*tofree_head
)
1031 struct inode
*inode
;
1034 spin_lock(&inode_sb_list_lock
);
1035 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
1037 * We have to scan also I_NEW inodes because they can already
1038 * have quota pointer initialized. Luckily, we need to touch
1039 * only quota pointers and these have separate locking
1042 if (!IS_NOQUOTA(inode
)) {
1043 if (unlikely(inode_get_rsv_space(inode
) > 0))
1045 remove_inode_dquot_ref(inode
, type
, tofree_head
);
1048 spin_unlock(&inode_sb_list_lock
);
1049 #ifdef CONFIG_QUOTA_DEBUG
1051 printk(KERN_WARNING
"VFS (%s): Writes happened after quota"
1052 " was disabled thus quota information is probably "
1053 "inconsistent. Please run quotacheck(8).\n", sb
->s_id
);
1058 /* Gather all references from inodes and drop them */
1059 static void drop_dquot_ref(struct super_block
*sb
, int type
)
1061 LIST_HEAD(tofree_head
);
1064 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1065 remove_dquot_ref(sb
, type
, &tofree_head
);
1066 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1067 put_dquot_list(&tofree_head
);
1071 static inline void dquot_incr_inodes(struct dquot
*dquot
, qsize_t number
)
1073 dquot
->dq_dqb
.dqb_curinodes
+= number
;
1076 static inline void dquot_incr_space(struct dquot
*dquot
, qsize_t number
)
1078 dquot
->dq_dqb
.dqb_curspace
+= number
;
1081 static inline void dquot_resv_space(struct dquot
*dquot
, qsize_t number
)
1083 dquot
->dq_dqb
.dqb_rsvspace
+= number
;
1087 * Claim reserved quota space
1089 static void dquot_claim_reserved_space(struct dquot
*dquot
, qsize_t number
)
1091 if (dquot
->dq_dqb
.dqb_rsvspace
< number
) {
1093 number
= dquot
->dq_dqb
.dqb_rsvspace
;
1095 dquot
->dq_dqb
.dqb_curspace
+= number
;
1096 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1099 static void dquot_reclaim_reserved_space(struct dquot
*dquot
, qsize_t number
)
1101 if (WARN_ON_ONCE(dquot
->dq_dqb
.dqb_curspace
< number
))
1102 number
= dquot
->dq_dqb
.dqb_curspace
;
1103 dquot
->dq_dqb
.dqb_rsvspace
+= number
;
1104 dquot
->dq_dqb
.dqb_curspace
-= number
;
1108 void dquot_free_reserved_space(struct dquot
*dquot
, qsize_t number
)
1110 if (dquot
->dq_dqb
.dqb_rsvspace
>= number
)
1111 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1114 dquot
->dq_dqb
.dqb_rsvspace
= 0;
1118 static void dquot_decr_inodes(struct dquot
*dquot
, qsize_t number
)
1120 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1121 dquot
->dq_dqb
.dqb_curinodes
>= number
)
1122 dquot
->dq_dqb
.dqb_curinodes
-= number
;
1124 dquot
->dq_dqb
.dqb_curinodes
= 0;
1125 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1126 dquot
->dq_dqb
.dqb_itime
= (time_t) 0;
1127 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
1130 static void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
1132 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1133 dquot
->dq_dqb
.dqb_curspace
>= number
)
1134 dquot
->dq_dqb
.dqb_curspace
-= number
;
1136 dquot
->dq_dqb
.dqb_curspace
= 0;
1137 if (dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1138 dquot
->dq_dqb
.dqb_btime
= (time_t) 0;
1139 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1143 struct super_block
*w_sb
;
1144 struct kqid w_dq_id
;
1148 static int warning_issued(struct dquot
*dquot
, const int warntype
)
1150 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
1151 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
1152 ((warntype
== QUOTA_NL_IHARDWARN
||
1153 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
1157 return test_and_set_bit(flag
, &dquot
->dq_flags
);
1160 #ifdef CONFIG_PRINT_QUOTA_WARNING
1161 static int flag_print_warnings
= 1;
1163 static int need_print_warning(struct dquot_warn
*warn
)
1165 if (!flag_print_warnings
)
1168 switch (warn
->w_dq_id
.type
) {
1170 return uid_eq(current_fsuid(), warn
->w_dq_id
.uid
);
1172 return in_group_p(warn
->w_dq_id
.gid
);
1173 case PRJQUOTA
: /* Never taken... Just make gcc happy */
1179 /* Print warning to user which exceeded quota */
1180 static void print_warning(struct dquot_warn
*warn
)
1183 struct tty_struct
*tty
;
1184 int warntype
= warn
->w_type
;
1186 if (warntype
== QUOTA_NL_IHARDBELOW
||
1187 warntype
== QUOTA_NL_ISOFTBELOW
||
1188 warntype
== QUOTA_NL_BHARDBELOW
||
1189 warntype
== QUOTA_NL_BSOFTBELOW
|| !need_print_warning(warn
))
1192 tty
= get_current_tty();
1195 tty_write_message(tty
, warn
->w_sb
->s_id
);
1196 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
1197 tty_write_message(tty
, ": warning, ");
1199 tty_write_message(tty
, ": write failed, ");
1200 tty_write_message(tty
, quotatypes
[warn
->w_dq_id
.type
]);
1202 case QUOTA_NL_IHARDWARN
:
1203 msg
= " file limit reached.\r\n";
1205 case QUOTA_NL_ISOFTLONGWARN
:
1206 msg
= " file quota exceeded too long.\r\n";
1208 case QUOTA_NL_ISOFTWARN
:
1209 msg
= " file quota exceeded.\r\n";
1211 case QUOTA_NL_BHARDWARN
:
1212 msg
= " block limit reached.\r\n";
1214 case QUOTA_NL_BSOFTLONGWARN
:
1215 msg
= " block quota exceeded too long.\r\n";
1217 case QUOTA_NL_BSOFTWARN
:
1218 msg
= " block quota exceeded.\r\n";
1221 tty_write_message(tty
, msg
);
1226 static void prepare_warning(struct dquot_warn
*warn
, struct dquot
*dquot
,
1229 if (warning_issued(dquot
, warntype
))
1231 warn
->w_type
= warntype
;
1232 warn
->w_sb
= dquot
->dq_sb
;
1233 warn
->w_dq_id
= dquot
->dq_id
;
1237 * Write warnings to the console and send warning messages over netlink.
1239 * Note that this function can call into tty and networking code.
1241 static void flush_warnings(struct dquot_warn
*warn
)
1245 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1246 if (warn
[i
].w_type
== QUOTA_NL_NOWARN
)
1248 #ifdef CONFIG_PRINT_QUOTA_WARNING
1249 print_warning(&warn
[i
]);
1251 quota_send_warning(warn
[i
].w_dq_id
,
1252 warn
[i
].w_sb
->s_dev
, warn
[i
].w_type
);
1256 static int ignore_hardlimit(struct dquot
*dquot
)
1258 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
];
1260 return capable(CAP_SYS_RESOURCE
) &&
1261 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
||
1262 !(info
->dqi_flags
& V1_DQF_RSQUASH
));
1265 /* needs dq_data_lock */
1266 static int check_idq(struct dquot
*dquot
, qsize_t inodes
,
1267 struct dquot_warn
*warn
)
1269 qsize_t newinodes
= dquot
->dq_dqb
.dqb_curinodes
+ inodes
;
1271 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_id
.type
) ||
1272 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1275 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1276 newinodes
> dquot
->dq_dqb
.dqb_ihardlimit
&&
1277 !ignore_hardlimit(dquot
)) {
1278 prepare_warning(warn
, dquot
, QUOTA_NL_IHARDWARN
);
1282 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1283 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1284 dquot
->dq_dqb
.dqb_itime
&&
1285 get_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1286 !ignore_hardlimit(dquot
)) {
1287 prepare_warning(warn
, dquot
, QUOTA_NL_ISOFTLONGWARN
);
1291 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1292 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1293 dquot
->dq_dqb
.dqb_itime
== 0) {
1294 prepare_warning(warn
, dquot
, QUOTA_NL_ISOFTWARN
);
1295 dquot
->dq_dqb
.dqb_itime
= get_seconds() +
1296 sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
].dqi_igrace
;
1302 /* needs dq_data_lock */
1303 static int check_bdq(struct dquot
*dquot
, qsize_t space
, int prealloc
,
1304 struct dquot_warn
*warn
)
1307 struct super_block
*sb
= dquot
->dq_sb
;
1309 if (!sb_has_quota_limits_enabled(sb
, dquot
->dq_id
.type
) ||
1310 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1313 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
1316 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1317 tspace
> dquot
->dq_dqb
.dqb_bhardlimit
&&
1318 !ignore_hardlimit(dquot
)) {
1320 prepare_warning(warn
, dquot
, QUOTA_NL_BHARDWARN
);
1324 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1325 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1326 dquot
->dq_dqb
.dqb_btime
&&
1327 get_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1328 !ignore_hardlimit(dquot
)) {
1330 prepare_warning(warn
, dquot
, QUOTA_NL_BSOFTLONGWARN
);
1334 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1335 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1336 dquot
->dq_dqb
.dqb_btime
== 0) {
1338 prepare_warning(warn
, dquot
, QUOTA_NL_BSOFTWARN
);
1339 dquot
->dq_dqb
.dqb_btime
= get_seconds() +
1340 sb_dqopt(sb
)->info
[dquot
->dq_id
.type
].dqi_bgrace
;
1344 * We don't allow preallocation to exceed softlimit so exceeding will
1353 static int info_idq_free(struct dquot
*dquot
, qsize_t inodes
)
1357 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1358 dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
||
1359 !sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_id
.type
))
1360 return QUOTA_NL_NOWARN
;
1362 newinodes
= dquot
->dq_dqb
.dqb_curinodes
- inodes
;
1363 if (newinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1364 return QUOTA_NL_ISOFTBELOW
;
1365 if (dquot
->dq_dqb
.dqb_curinodes
>= dquot
->dq_dqb
.dqb_ihardlimit
&&
1366 newinodes
< dquot
->dq_dqb
.dqb_ihardlimit
)
1367 return QUOTA_NL_IHARDBELOW
;
1368 return QUOTA_NL_NOWARN
;
1371 static int info_bdq_free(struct dquot
*dquot
, qsize_t space
)
1373 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1374 dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1375 return QUOTA_NL_NOWARN
;
1377 if (dquot
->dq_dqb
.dqb_curspace
- space
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1378 return QUOTA_NL_BSOFTBELOW
;
1379 if (dquot
->dq_dqb
.dqb_curspace
>= dquot
->dq_dqb
.dqb_bhardlimit
&&
1380 dquot
->dq_dqb
.dqb_curspace
- space
< dquot
->dq_dqb
.dqb_bhardlimit
)
1381 return QUOTA_NL_BHARDBELOW
;
1382 return QUOTA_NL_NOWARN
;
1385 static int dquot_active(const struct inode
*inode
)
1387 struct super_block
*sb
= inode
->i_sb
;
1389 if (IS_NOQUOTA(inode
))
1391 return sb_any_quota_loaded(sb
) & ~sb_any_quota_suspended(sb
);
1395 * Initialize quota pointers in inode
1397 * We do things in a bit complicated way but by that we avoid calling
1398 * dqget() and thus filesystem callbacks under dqptr_sem.
1400 * It is better to call this function outside of any transaction as it
1401 * might need a lot of space in journal for dquot structure allocation.
1403 static void __dquot_initialize(struct inode
*inode
, int type
)
1406 struct dquot
*got
[MAXQUOTAS
];
1407 struct super_block
*sb
= inode
->i_sb
;
1410 /* First test before acquiring mutex - solves deadlocks when we
1411 * re-enter the quota code and are already holding the mutex */
1412 if (!dquot_active(inode
))
1415 /* First get references to structures we might need. */
1416 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1419 if (type
!= -1 && cnt
!= type
)
1423 qid
= make_kqid_uid(inode
->i_uid
);
1426 qid
= make_kqid_gid(inode
->i_gid
);
1429 got
[cnt
] = dqget(sb
, qid
);
1432 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1433 if (IS_NOQUOTA(inode
))
1435 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1436 if (type
!= -1 && cnt
!= type
)
1438 /* Avoid races with quotaoff() */
1439 if (!sb_has_quota_active(sb
, cnt
))
1441 /* We could race with quotaon or dqget() could have failed */
1444 if (!inode
->i_dquot
[cnt
]) {
1445 inode
->i_dquot
[cnt
] = got
[cnt
];
1448 * Make quota reservation system happy if someone
1449 * did a write before quota was turned on
1451 rsv
= inode_get_rsv_space(inode
);
1452 if (unlikely(rsv
)) {
1453 spin_lock(&dq_data_lock
);
1454 dquot_resv_space(inode
->i_dquot
[cnt
], rsv
);
1455 spin_unlock(&dq_data_lock
);
1460 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1461 /* Drop unused references */
1465 void dquot_initialize(struct inode
*inode
)
1467 __dquot_initialize(inode
, -1);
1469 EXPORT_SYMBOL(dquot_initialize
);
1472 * Release all quotas referenced by inode
1474 static void __dquot_drop(struct inode
*inode
)
1477 struct dquot
*put
[MAXQUOTAS
];
1479 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1480 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1481 put
[cnt
] = inode
->i_dquot
[cnt
];
1482 inode
->i_dquot
[cnt
] = NULL
;
1484 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1488 void dquot_drop(struct inode
*inode
)
1492 if (IS_NOQUOTA(inode
))
1496 * Test before calling to rule out calls from proc and such
1497 * where we are not allowed to block. Note that this is
1498 * actually reliable test even without the lock - the caller
1499 * must assure that nobody can come after the DQUOT_DROP and
1500 * add quota pointers back anyway.
1502 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1503 if (inode
->i_dquot
[cnt
])
1507 if (cnt
< MAXQUOTAS
)
1508 __dquot_drop(inode
);
1510 EXPORT_SYMBOL(dquot_drop
);
1513 * inode_reserved_space is managed internally by quota, and protected by
1514 * i_lock similar to i_blocks+i_bytes.
1516 static qsize_t
*inode_reserved_space(struct inode
* inode
)
1518 /* Filesystem must explicitly define it's own method in order to use
1519 * quota reservation interface */
1520 BUG_ON(!inode
->i_sb
->dq_op
->get_reserved_space
);
1521 return inode
->i_sb
->dq_op
->get_reserved_space(inode
);
1524 void inode_add_rsv_space(struct inode
*inode
, qsize_t number
)
1526 spin_lock(&inode
->i_lock
);
1527 *inode_reserved_space(inode
) += number
;
1528 spin_unlock(&inode
->i_lock
);
1530 EXPORT_SYMBOL(inode_add_rsv_space
);
1532 void inode_claim_rsv_space(struct inode
*inode
, qsize_t number
)
1534 spin_lock(&inode
->i_lock
);
1535 *inode_reserved_space(inode
) -= number
;
1536 __inode_add_bytes(inode
, number
);
1537 spin_unlock(&inode
->i_lock
);
1539 EXPORT_SYMBOL(inode_claim_rsv_space
);
1541 void inode_reclaim_rsv_space(struct inode
*inode
, qsize_t number
)
1543 spin_lock(&inode
->i_lock
);
1544 *inode_reserved_space(inode
) += number
;
1545 __inode_sub_bytes(inode
, number
);
1546 spin_unlock(&inode
->i_lock
);
1548 EXPORT_SYMBOL(inode_reclaim_rsv_space
);
1550 void inode_sub_rsv_space(struct inode
*inode
, qsize_t number
)
1552 spin_lock(&inode
->i_lock
);
1553 *inode_reserved_space(inode
) -= number
;
1554 spin_unlock(&inode
->i_lock
);
1556 EXPORT_SYMBOL(inode_sub_rsv_space
);
1558 static qsize_t
inode_get_rsv_space(struct inode
*inode
)
1562 if (!inode
->i_sb
->dq_op
->get_reserved_space
)
1564 spin_lock(&inode
->i_lock
);
1565 ret
= *inode_reserved_space(inode
);
1566 spin_unlock(&inode
->i_lock
);
1570 static void inode_incr_space(struct inode
*inode
, qsize_t number
,
1574 inode_add_rsv_space(inode
, number
);
1576 inode_add_bytes(inode
, number
);
1579 static void inode_decr_space(struct inode
*inode
, qsize_t number
, int reserve
)
1582 inode_sub_rsv_space(inode
, number
);
1584 inode_sub_bytes(inode
, number
);
1588 * This functions updates i_blocks+i_bytes fields and quota information
1589 * (together with appropriate checks).
1591 * NOTE: We absolutely rely on the fact that caller dirties the inode
1592 * (usually helpers in quotaops.h care about this) and holds a handle for
1593 * the current transaction so that dquot write and inode write go into the
1598 * This operation can block, but only after everything is updated
1600 int __dquot_alloc_space(struct inode
*inode
, qsize_t number
, int flags
)
1603 struct dquot_warn warn
[MAXQUOTAS
];
1604 struct dquot
**dquots
= inode
->i_dquot
;
1605 int reserve
= flags
& DQUOT_SPACE_RESERVE
;
1608 * First test before acquiring mutex - solves deadlocks when we
1609 * re-enter the quota code and are already holding the mutex
1611 if (!dquot_active(inode
)) {
1612 inode_incr_space(inode
, number
, reserve
);
1616 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1617 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1619 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1620 spin_lock(&dq_data_lock
);
1621 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1624 ret
= check_bdq(dquots
[cnt
], number
,
1625 !(flags
& DQUOT_SPACE_WARN
), &warn
[cnt
]);
1626 if (ret
&& !(flags
& DQUOT_SPACE_NOFAIL
)) {
1627 spin_unlock(&dq_data_lock
);
1628 goto out_flush_warn
;
1631 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1635 dquot_resv_space(dquots
[cnt
], number
);
1637 dquot_incr_space(dquots
[cnt
], number
);
1639 inode_incr_space(inode
, number
, reserve
);
1640 spin_unlock(&dq_data_lock
);
1643 goto out_flush_warn
;
1644 mark_all_dquot_dirty(dquots
);
1646 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1647 flush_warnings(warn
);
1651 EXPORT_SYMBOL(__dquot_alloc_space
);
1654 * This operation can block, but only after everything is updated
1656 int dquot_alloc_inode(const struct inode
*inode
)
1659 struct dquot_warn warn
[MAXQUOTAS
];
1660 struct dquot
* const *dquots
= inode
->i_dquot
;
1662 /* First test before acquiring mutex - solves deadlocks when we
1663 * re-enter the quota code and are already holding the mutex */
1664 if (!dquot_active(inode
))
1666 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1667 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1668 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1669 spin_lock(&dq_data_lock
);
1670 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1673 ret
= check_idq(dquots
[cnt
], 1, &warn
[cnt
]);
1678 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1681 dquot_incr_inodes(dquots
[cnt
], 1);
1685 spin_unlock(&dq_data_lock
);
1687 mark_all_dquot_dirty(dquots
);
1688 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1689 flush_warnings(warn
);
1692 EXPORT_SYMBOL(dquot_alloc_inode
);
1695 * Convert in-memory reserved quotas to real consumed quotas
1697 int dquot_claim_space_nodirty(struct inode
*inode
, qsize_t number
)
1701 if (!dquot_active(inode
)) {
1702 inode_claim_rsv_space(inode
, number
);
1706 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1707 spin_lock(&dq_data_lock
);
1708 /* Claim reserved quotas to allocated quotas */
1709 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1710 if (inode
->i_dquot
[cnt
])
1711 dquot_claim_reserved_space(inode
->i_dquot
[cnt
],
1714 /* Update inode bytes */
1715 inode_claim_rsv_space(inode
, number
);
1716 spin_unlock(&dq_data_lock
);
1717 mark_all_dquot_dirty(inode
->i_dquot
);
1718 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1721 EXPORT_SYMBOL(dquot_claim_space_nodirty
);
1724 * Convert allocated space back to in-memory reserved quotas
1726 void dquot_reclaim_space_nodirty(struct inode
*inode
, qsize_t number
)
1730 if (!dquot_active(inode
)) {
1731 inode_reclaim_rsv_space(inode
, number
);
1735 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1736 spin_lock(&dq_data_lock
);
1737 /* Claim reserved quotas to allocated quotas */
1738 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1739 if (inode
->i_dquot
[cnt
])
1740 dquot_reclaim_reserved_space(inode
->i_dquot
[cnt
],
1743 /* Update inode bytes */
1744 inode_reclaim_rsv_space(inode
, number
);
1745 spin_unlock(&dq_data_lock
);
1746 mark_all_dquot_dirty(inode
->i_dquot
);
1747 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1750 EXPORT_SYMBOL(dquot_reclaim_space_nodirty
);
1753 * This operation can block, but only after everything is updated
1755 void __dquot_free_space(struct inode
*inode
, qsize_t number
, int flags
)
1758 struct dquot_warn warn
[MAXQUOTAS
];
1759 struct dquot
**dquots
= inode
->i_dquot
;
1760 int reserve
= flags
& DQUOT_SPACE_RESERVE
;
1762 /* First test before acquiring mutex - solves deadlocks when we
1763 * re-enter the quota code and are already holding the mutex */
1764 if (!dquot_active(inode
)) {
1765 inode_decr_space(inode
, number
, reserve
);
1769 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1770 spin_lock(&dq_data_lock
);
1771 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1774 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1777 wtype
= info_bdq_free(dquots
[cnt
], number
);
1778 if (wtype
!= QUOTA_NL_NOWARN
)
1779 prepare_warning(&warn
[cnt
], dquots
[cnt
], wtype
);
1781 dquot_free_reserved_space(dquots
[cnt
], number
);
1783 dquot_decr_space(dquots
[cnt
], number
);
1785 inode_decr_space(inode
, number
, reserve
);
1786 spin_unlock(&dq_data_lock
);
1790 mark_all_dquot_dirty(dquots
);
1792 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1793 flush_warnings(warn
);
1795 EXPORT_SYMBOL(__dquot_free_space
);
1798 * This operation can block, but only after everything is updated
1800 void dquot_free_inode(const struct inode
*inode
)
1803 struct dquot_warn warn
[MAXQUOTAS
];
1804 struct dquot
* const *dquots
= inode
->i_dquot
;
1806 /* First test before acquiring mutex - solves deadlocks when we
1807 * re-enter the quota code and are already holding the mutex */
1808 if (!dquot_active(inode
))
1811 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1812 spin_lock(&dq_data_lock
);
1813 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1816 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1819 wtype
= info_idq_free(dquots
[cnt
], 1);
1820 if (wtype
!= QUOTA_NL_NOWARN
)
1821 prepare_warning(&warn
[cnt
], dquots
[cnt
], wtype
);
1822 dquot_decr_inodes(dquots
[cnt
], 1);
1824 spin_unlock(&dq_data_lock
);
1825 mark_all_dquot_dirty(dquots
);
1826 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1827 flush_warnings(warn
);
1829 EXPORT_SYMBOL(dquot_free_inode
);
1832 * Transfer the number of inode and blocks from one diskquota to an other.
1833 * On success, dquot references in transfer_to are consumed and references
1834 * to original dquots that need to be released are placed there. On failure,
1835 * references are kept untouched.
1837 * This operation can block, but only after everything is updated
1838 * A transaction must be started when entering this function.
1841 int __dquot_transfer(struct inode
*inode
, struct dquot
**transfer_to
)
1843 qsize_t space
, cur_space
;
1844 qsize_t rsv_space
= 0;
1845 struct dquot
*transfer_from
[MAXQUOTAS
] = {};
1847 char is_valid
[MAXQUOTAS
] = {};
1848 struct dquot_warn warn_to
[MAXQUOTAS
];
1849 struct dquot_warn warn_from_inodes
[MAXQUOTAS
];
1850 struct dquot_warn warn_from_space
[MAXQUOTAS
];
1852 /* First test before acquiring mutex - solves deadlocks when we
1853 * re-enter the quota code and are already holding the mutex */
1854 if (IS_NOQUOTA(inode
))
1856 /* Initialize the arrays */
1857 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1858 warn_to
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1859 warn_from_inodes
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1860 warn_from_space
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1862 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1863 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1864 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1867 spin_lock(&dq_data_lock
);
1868 cur_space
= inode_get_bytes(inode
);
1869 rsv_space
= inode_get_rsv_space(inode
);
1870 space
= cur_space
+ rsv_space
;
1871 /* Build the transfer_from list and check the limits */
1872 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1874 * Skip changes for same uid or gid or for turned off quota-type.
1876 if (!transfer_to
[cnt
])
1878 /* Avoid races with quotaoff() */
1879 if (!sb_has_quota_active(inode
->i_sb
, cnt
))
1882 transfer_from
[cnt
] = inode
->i_dquot
[cnt
];
1883 ret
= check_idq(transfer_to
[cnt
], 1, &warn_to
[cnt
]);
1886 ret
= check_bdq(transfer_to
[cnt
], space
, 0, &warn_to
[cnt
]);
1892 * Finally perform the needed transfer from transfer_from to transfer_to
1894 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1897 /* Due to IO error we might not have transfer_from[] structure */
1898 if (transfer_from
[cnt
]) {
1900 wtype
= info_idq_free(transfer_from
[cnt
], 1);
1901 if (wtype
!= QUOTA_NL_NOWARN
)
1902 prepare_warning(&warn_from_inodes
[cnt
],
1903 transfer_from
[cnt
], wtype
);
1904 wtype
= info_bdq_free(transfer_from
[cnt
], space
);
1905 if (wtype
!= QUOTA_NL_NOWARN
)
1906 prepare_warning(&warn_from_space
[cnt
],
1907 transfer_from
[cnt
], wtype
);
1908 dquot_decr_inodes(transfer_from
[cnt
], 1);
1909 dquot_decr_space(transfer_from
[cnt
], cur_space
);
1910 dquot_free_reserved_space(transfer_from
[cnt
],
1914 dquot_incr_inodes(transfer_to
[cnt
], 1);
1915 dquot_incr_space(transfer_to
[cnt
], cur_space
);
1916 dquot_resv_space(transfer_to
[cnt
], rsv_space
);
1918 inode
->i_dquot
[cnt
] = transfer_to
[cnt
];
1920 spin_unlock(&dq_data_lock
);
1921 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1923 mark_all_dquot_dirty(transfer_from
);
1924 mark_all_dquot_dirty(transfer_to
);
1925 flush_warnings(warn_to
);
1926 flush_warnings(warn_from_inodes
);
1927 flush_warnings(warn_from_space
);
1928 /* Pass back references to put */
1929 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1931 transfer_to
[cnt
] = transfer_from
[cnt
];
1934 spin_unlock(&dq_data_lock
);
1935 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1936 flush_warnings(warn_to
);
1939 EXPORT_SYMBOL(__dquot_transfer
);
1941 /* Wrapper for transferring ownership of an inode for uid/gid only
1942 * Called from FSXXX_setattr()
1944 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
1946 struct dquot
*transfer_to
[MAXQUOTAS
] = {};
1947 struct super_block
*sb
= inode
->i_sb
;
1950 if (!dquot_active(inode
))
1953 if (iattr
->ia_valid
& ATTR_UID
&& !uid_eq(iattr
->ia_uid
, inode
->i_uid
))
1954 transfer_to
[USRQUOTA
] = dqget(sb
, make_kqid_uid(iattr
->ia_uid
));
1955 if (iattr
->ia_valid
& ATTR_GID
&& !gid_eq(iattr
->ia_gid
, inode
->i_gid
))
1956 transfer_to
[GRPQUOTA
] = dqget(sb
, make_kqid_gid(iattr
->ia_gid
));
1958 ret
= __dquot_transfer(inode
, transfer_to
);
1959 dqput_all(transfer_to
);
1962 EXPORT_SYMBOL(dquot_transfer
);
1965 * Write info of quota file to disk
1967 int dquot_commit_info(struct super_block
*sb
, int type
)
1970 struct quota_info
*dqopt
= sb_dqopt(sb
);
1972 mutex_lock(&dqopt
->dqio_mutex
);
1973 ret
= dqopt
->ops
[type
]->write_file_info(sb
, type
);
1974 mutex_unlock(&dqopt
->dqio_mutex
);
1977 EXPORT_SYMBOL(dquot_commit_info
);
1980 * Definitions of diskquota operations.
1982 const struct dquot_operations dquot_operations
= {
1983 .write_dquot
= dquot_commit
,
1984 .acquire_dquot
= dquot_acquire
,
1985 .release_dquot
= dquot_release
,
1986 .mark_dirty
= dquot_mark_dquot_dirty
,
1987 .write_info
= dquot_commit_info
,
1988 .alloc_dquot
= dquot_alloc
,
1989 .destroy_dquot
= dquot_destroy
,
1991 EXPORT_SYMBOL(dquot_operations
);
1994 * Generic helper for ->open on filesystems supporting disk quotas.
1996 int dquot_file_open(struct inode
*inode
, struct file
*file
)
2000 error
= generic_file_open(inode
, file
);
2001 if (!error
&& (file
->f_mode
& FMODE_WRITE
))
2002 dquot_initialize(inode
);
2005 EXPORT_SYMBOL(dquot_file_open
);
2008 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
2010 int dquot_disable(struct super_block
*sb
, int type
, unsigned int flags
)
2013 struct quota_info
*dqopt
= sb_dqopt(sb
);
2014 struct inode
*toputinode
[MAXQUOTAS
];
2016 /* Cannot turn off usage accounting without turning off limits, or
2017 * suspend quotas and simultaneously turn quotas off. */
2018 if ((flags
& DQUOT_USAGE_ENABLED
&& !(flags
& DQUOT_LIMITS_ENABLED
))
2019 || (flags
& DQUOT_SUSPENDED
&& flags
& (DQUOT_LIMITS_ENABLED
|
2020 DQUOT_USAGE_ENABLED
)))
2023 /* We need to serialize quota_off() for device */
2024 mutex_lock(&dqopt
->dqonoff_mutex
);
2027 * Skip everything if there's nothing to do. We have to do this because
2028 * sometimes we are called when fill_super() failed and calling
2029 * sync_fs() in such cases does no good.
2031 if (!sb_any_quota_loaded(sb
)) {
2032 mutex_unlock(&dqopt
->dqonoff_mutex
);
2035 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2036 toputinode
[cnt
] = NULL
;
2037 if (type
!= -1 && cnt
!= type
)
2039 if (!sb_has_quota_loaded(sb
, cnt
))
2042 if (flags
& DQUOT_SUSPENDED
) {
2043 spin_lock(&dq_state_lock
);
2045 dquot_state_flag(DQUOT_SUSPENDED
, cnt
);
2046 spin_unlock(&dq_state_lock
);
2048 spin_lock(&dq_state_lock
);
2049 dqopt
->flags
&= ~dquot_state_flag(flags
, cnt
);
2050 /* Turning off suspended quotas? */
2051 if (!sb_has_quota_loaded(sb
, cnt
) &&
2052 sb_has_quota_suspended(sb
, cnt
)) {
2053 dqopt
->flags
&= ~dquot_state_flag(
2054 DQUOT_SUSPENDED
, cnt
);
2055 spin_unlock(&dq_state_lock
);
2056 iput(dqopt
->files
[cnt
]);
2057 dqopt
->files
[cnt
] = NULL
;
2060 spin_unlock(&dq_state_lock
);
2063 /* We still have to keep quota loaded? */
2064 if (sb_has_quota_loaded(sb
, cnt
) && !(flags
& DQUOT_SUSPENDED
))
2067 /* Note: these are blocking operations */
2068 drop_dquot_ref(sb
, cnt
);
2069 invalidate_dquots(sb
, cnt
);
2071 * Now all dquots should be invalidated, all writes done so we
2072 * should be only users of the info. No locks needed.
2074 if (info_dirty(&dqopt
->info
[cnt
]))
2075 sb
->dq_op
->write_info(sb
, cnt
);
2076 if (dqopt
->ops
[cnt
]->free_file_info
)
2077 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
2078 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
2080 toputinode
[cnt
] = dqopt
->files
[cnt
];
2081 if (!sb_has_quota_loaded(sb
, cnt
))
2082 dqopt
->files
[cnt
] = NULL
;
2083 dqopt
->info
[cnt
].dqi_flags
= 0;
2084 dqopt
->info
[cnt
].dqi_igrace
= 0;
2085 dqopt
->info
[cnt
].dqi_bgrace
= 0;
2086 dqopt
->ops
[cnt
] = NULL
;
2088 mutex_unlock(&dqopt
->dqonoff_mutex
);
2090 /* Skip syncing and setting flags if quota files are hidden */
2091 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
2094 /* Sync the superblock so that buffers with quota data are written to
2095 * disk (and so userspace sees correct data afterwards). */
2096 if (sb
->s_op
->sync_fs
)
2097 sb
->s_op
->sync_fs(sb
, 1);
2098 sync_blockdev(sb
->s_bdev
);
2099 /* Now the quota files are just ordinary files and we can set the
2100 * inode flags back. Moreover we discard the pagecache so that
2101 * userspace sees the writes we did bypassing the pagecache. We
2102 * must also discard the blockdev buffers so that we see the
2103 * changes done by userspace on the next quotaon() */
2104 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2105 if (toputinode
[cnt
]) {
2106 mutex_lock(&dqopt
->dqonoff_mutex
);
2107 /* If quota was reenabled in the meantime, we have
2109 if (!sb_has_quota_loaded(sb
, cnt
)) {
2110 mutex_lock(&toputinode
[cnt
]->i_mutex
);
2111 toputinode
[cnt
]->i_flags
&= ~(S_IMMUTABLE
|
2112 S_NOATIME
| S_NOQUOTA
);
2113 truncate_inode_pages(&toputinode
[cnt
]->i_data
,
2115 mutex_unlock(&toputinode
[cnt
]->i_mutex
);
2116 mark_inode_dirty_sync(toputinode
[cnt
]);
2118 mutex_unlock(&dqopt
->dqonoff_mutex
);
2121 invalidate_bdev(sb
->s_bdev
);
2123 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2124 if (toputinode
[cnt
]) {
2125 /* On remount RO, we keep the inode pointer so that we
2126 * can reenable quota on the subsequent remount RW. We
2127 * have to check 'flags' variable and not use sb_has_
2128 * function because another quotaon / quotaoff could
2129 * change global state before we got here. We refuse
2130 * to suspend quotas when there is pending delete on
2131 * the quota file... */
2132 if (!(flags
& DQUOT_SUSPENDED
))
2133 iput(toputinode
[cnt
]);
2134 else if (!toputinode
[cnt
]->i_nlink
)
2139 EXPORT_SYMBOL(dquot_disable
);
2141 int dquot_quota_off(struct super_block
*sb
, int type
)
2143 return dquot_disable(sb
, type
,
2144 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2146 EXPORT_SYMBOL(dquot_quota_off
);
2149 * Turn quotas on on a device
2153 * Helper function to turn quotas on when we already have the inode of
2154 * quota file and no quota information is loaded.
2156 static int vfs_load_quota_inode(struct inode
*inode
, int type
, int format_id
,
2159 struct quota_format_type
*fmt
= find_quota_format(format_id
);
2160 struct super_block
*sb
= inode
->i_sb
;
2161 struct quota_info
*dqopt
= sb_dqopt(sb
);
2167 if (!S_ISREG(inode
->i_mode
)) {
2171 if (IS_RDONLY(inode
)) {
2175 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
) {
2179 /* Usage always has to be set... */
2180 if (!(flags
& DQUOT_USAGE_ENABLED
)) {
2185 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2186 /* As we bypass the pagecache we must now flush all the
2187 * dirty data and invalidate caches so that kernel sees
2188 * changes from userspace. It is not enough to just flush
2189 * the quota file since if blocksize < pagesize, invalidation
2190 * of the cache could fail because of other unrelated dirty
2192 sync_filesystem(sb
);
2193 invalidate_bdev(sb
->s_bdev
);
2195 mutex_lock(&dqopt
->dqonoff_mutex
);
2196 if (sb_has_quota_loaded(sb
, type
)) {
2201 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2202 /* We don't want quota and atime on quota files (deadlocks
2203 * possible) Also nobody should write to the file - we use
2204 * special IO operations which ignore the immutable bit. */
2205 mutex_lock(&inode
->i_mutex
);
2206 oldflags
= inode
->i_flags
& (S_NOATIME
| S_IMMUTABLE
|
2208 inode
->i_flags
|= S_NOQUOTA
| S_NOATIME
| S_IMMUTABLE
;
2209 mutex_unlock(&inode
->i_mutex
);
2211 * When S_NOQUOTA is set, remove dquot references as no more
2212 * references can be added
2214 __dquot_drop(inode
);
2218 dqopt
->files
[type
] = igrab(inode
);
2219 if (!dqopt
->files
[type
])
2222 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
2225 dqopt
->ops
[type
] = fmt
->qf_ops
;
2226 dqopt
->info
[type
].dqi_format
= fmt
;
2227 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
2228 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
2229 mutex_lock(&dqopt
->dqio_mutex
);
2230 error
= dqopt
->ops
[type
]->read_file_info(sb
, type
);
2232 mutex_unlock(&dqopt
->dqio_mutex
);
2235 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
2236 dqopt
->info
[type
].dqi_flags
|= DQF_SYS_FILE
;
2237 mutex_unlock(&dqopt
->dqio_mutex
);
2238 spin_lock(&dq_state_lock
);
2239 dqopt
->flags
|= dquot_state_flag(flags
, type
);
2240 spin_unlock(&dq_state_lock
);
2242 add_dquot_ref(sb
, type
);
2243 mutex_unlock(&dqopt
->dqonoff_mutex
);
2248 dqopt
->files
[type
] = NULL
;
2251 if (oldflags
!= -1) {
2252 mutex_lock(&inode
->i_mutex
);
2253 /* Set the flags back (in the case of accidental quotaon()
2254 * on a wrong file we don't want to mess up the flags) */
2255 inode
->i_flags
&= ~(S_NOATIME
| S_NOQUOTA
| S_IMMUTABLE
);
2256 inode
->i_flags
|= oldflags
;
2257 mutex_unlock(&inode
->i_mutex
);
2259 mutex_unlock(&dqopt
->dqonoff_mutex
);
2261 put_quota_format(fmt
);
2266 /* Reenable quotas on remount RW */
2267 int dquot_resume(struct super_block
*sb
, int type
)
2269 struct quota_info
*dqopt
= sb_dqopt(sb
);
2270 struct inode
*inode
;
2274 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2275 if (type
!= -1 && cnt
!= type
)
2278 mutex_lock(&dqopt
->dqonoff_mutex
);
2279 if (!sb_has_quota_suspended(sb
, cnt
)) {
2280 mutex_unlock(&dqopt
->dqonoff_mutex
);
2283 inode
= dqopt
->files
[cnt
];
2284 dqopt
->files
[cnt
] = NULL
;
2285 spin_lock(&dq_state_lock
);
2286 flags
= dqopt
->flags
& dquot_state_flag(DQUOT_USAGE_ENABLED
|
2287 DQUOT_LIMITS_ENABLED
,
2289 dqopt
->flags
&= ~dquot_state_flag(DQUOT_STATE_FLAGS
, cnt
);
2290 spin_unlock(&dq_state_lock
);
2291 mutex_unlock(&dqopt
->dqonoff_mutex
);
2293 flags
= dquot_generic_flag(flags
, cnt
);
2294 ret
= vfs_load_quota_inode(inode
, cnt
,
2295 dqopt
->info
[cnt
].dqi_fmt_id
, flags
);
2301 EXPORT_SYMBOL(dquot_resume
);
2303 int dquot_quota_on(struct super_block
*sb
, int type
, int format_id
,
2306 int error
= security_quota_on(path
->dentry
);
2309 /* Quota file not on the same filesystem? */
2310 if (path
->dentry
->d_sb
!= sb
)
2313 error
= vfs_load_quota_inode(path
->dentry
->d_inode
, type
,
2314 format_id
, DQUOT_USAGE_ENABLED
|
2315 DQUOT_LIMITS_ENABLED
);
2318 EXPORT_SYMBOL(dquot_quota_on
);
2321 * More powerful function for turning on quotas allowing setting
2322 * of individual quota flags
2324 int dquot_enable(struct inode
*inode
, int type
, int format_id
,
2328 struct super_block
*sb
= inode
->i_sb
;
2329 struct quota_info
*dqopt
= sb_dqopt(sb
);
2331 /* Just unsuspend quotas? */
2332 BUG_ON(flags
& DQUOT_SUSPENDED
);
2336 /* Just updating flags needed? */
2337 if (sb_has_quota_loaded(sb
, type
)) {
2338 mutex_lock(&dqopt
->dqonoff_mutex
);
2339 /* Now do a reliable test... */
2340 if (!sb_has_quota_loaded(sb
, type
)) {
2341 mutex_unlock(&dqopt
->dqonoff_mutex
);
2344 if (flags
& DQUOT_USAGE_ENABLED
&&
2345 sb_has_quota_usage_enabled(sb
, type
)) {
2349 if (flags
& DQUOT_LIMITS_ENABLED
&&
2350 sb_has_quota_limits_enabled(sb
, type
)) {
2354 spin_lock(&dq_state_lock
);
2355 sb_dqopt(sb
)->flags
|= dquot_state_flag(flags
, type
);
2356 spin_unlock(&dq_state_lock
);
2358 mutex_unlock(&dqopt
->dqonoff_mutex
);
2363 return vfs_load_quota_inode(inode
, type
, format_id
, flags
);
2365 EXPORT_SYMBOL(dquot_enable
);
2368 * This function is used when filesystem needs to initialize quotas
2369 * during mount time.
2371 int dquot_quota_on_mount(struct super_block
*sb
, char *qf_name
,
2372 int format_id
, int type
)
2374 struct dentry
*dentry
;
2377 mutex_lock(&sb
->s_root
->d_inode
->i_mutex
);
2378 dentry
= lookup_one_len(qf_name
, sb
->s_root
, strlen(qf_name
));
2379 mutex_unlock(&sb
->s_root
->d_inode
->i_mutex
);
2381 return PTR_ERR(dentry
);
2383 if (!dentry
->d_inode
) {
2388 error
= security_quota_on(dentry
);
2390 error
= vfs_load_quota_inode(dentry
->d_inode
, type
, format_id
,
2391 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2397 EXPORT_SYMBOL(dquot_quota_on_mount
);
2399 static inline qsize_t
qbtos(qsize_t blocks
)
2401 return blocks
<< QIF_DQBLKSIZE_BITS
;
2404 static inline qsize_t
stoqb(qsize_t space
)
2406 return (space
+ QIF_DQBLKSIZE
- 1) >> QIF_DQBLKSIZE_BITS
;
2409 /* Generic routine for getting common part of quota structure */
2410 static void do_get_dqblk(struct dquot
*dquot
, struct fs_disk_quota
*di
)
2412 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2414 memset(di
, 0, sizeof(*di
));
2415 di
->d_version
= FS_DQUOT_VERSION
;
2416 di
->d_flags
= dquot
->dq_id
.type
== USRQUOTA
?
2417 FS_USER_QUOTA
: FS_GROUP_QUOTA
;
2418 di
->d_id
= from_kqid_munged(current_user_ns(), dquot
->dq_id
);
2420 spin_lock(&dq_data_lock
);
2421 di
->d_blk_hardlimit
= stoqb(dm
->dqb_bhardlimit
);
2422 di
->d_blk_softlimit
= stoqb(dm
->dqb_bsoftlimit
);
2423 di
->d_ino_hardlimit
= dm
->dqb_ihardlimit
;
2424 di
->d_ino_softlimit
= dm
->dqb_isoftlimit
;
2425 di
->d_bcount
= dm
->dqb_curspace
+ dm
->dqb_rsvspace
;
2426 di
->d_icount
= dm
->dqb_curinodes
;
2427 di
->d_btimer
= dm
->dqb_btime
;
2428 di
->d_itimer
= dm
->dqb_itime
;
2429 spin_unlock(&dq_data_lock
);
2432 int dquot_get_dqblk(struct super_block
*sb
, struct kqid qid
,
2433 struct fs_disk_quota
*di
)
2435 struct dquot
*dquot
;
2437 dquot
= dqget(sb
, qid
);
2440 do_get_dqblk(dquot
, di
);
2445 EXPORT_SYMBOL(dquot_get_dqblk
);
2447 #define VFS_FS_DQ_MASK \
2448 (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \
2449 FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \
2450 FS_DQ_BTIMER | FS_DQ_ITIMER)
2452 /* Generic routine for setting common part of quota structure */
2453 static int do_set_dqblk(struct dquot
*dquot
, struct fs_disk_quota
*di
)
2455 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2456 int check_blim
= 0, check_ilim
= 0;
2457 struct mem_dqinfo
*dqi
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
];
2459 if (di
->d_fieldmask
& ~VFS_FS_DQ_MASK
)
2462 if (((di
->d_fieldmask
& FS_DQ_BSOFT
) &&
2463 (di
->d_blk_softlimit
> dqi
->dqi_maxblimit
)) ||
2464 ((di
->d_fieldmask
& FS_DQ_BHARD
) &&
2465 (di
->d_blk_hardlimit
> dqi
->dqi_maxblimit
)) ||
2466 ((di
->d_fieldmask
& FS_DQ_ISOFT
) &&
2467 (di
->d_ino_softlimit
> dqi
->dqi_maxilimit
)) ||
2468 ((di
->d_fieldmask
& FS_DQ_IHARD
) &&
2469 (di
->d_ino_hardlimit
> dqi
->dqi_maxilimit
)))
2472 spin_lock(&dq_data_lock
);
2473 if (di
->d_fieldmask
& FS_DQ_BCOUNT
) {
2474 dm
->dqb_curspace
= di
->d_bcount
- dm
->dqb_rsvspace
;
2476 set_bit(DQ_LASTSET_B
+ QIF_SPACE_B
, &dquot
->dq_flags
);
2479 if (di
->d_fieldmask
& FS_DQ_BSOFT
)
2480 dm
->dqb_bsoftlimit
= qbtos(di
->d_blk_softlimit
);
2481 if (di
->d_fieldmask
& FS_DQ_BHARD
)
2482 dm
->dqb_bhardlimit
= qbtos(di
->d_blk_hardlimit
);
2483 if (di
->d_fieldmask
& (FS_DQ_BSOFT
| FS_DQ_BHARD
)) {
2485 set_bit(DQ_LASTSET_B
+ QIF_BLIMITS_B
, &dquot
->dq_flags
);
2488 if (di
->d_fieldmask
& FS_DQ_ICOUNT
) {
2489 dm
->dqb_curinodes
= di
->d_icount
;
2491 set_bit(DQ_LASTSET_B
+ QIF_INODES_B
, &dquot
->dq_flags
);
2494 if (di
->d_fieldmask
& FS_DQ_ISOFT
)
2495 dm
->dqb_isoftlimit
= di
->d_ino_softlimit
;
2496 if (di
->d_fieldmask
& FS_DQ_IHARD
)
2497 dm
->dqb_ihardlimit
= di
->d_ino_hardlimit
;
2498 if (di
->d_fieldmask
& (FS_DQ_ISOFT
| FS_DQ_IHARD
)) {
2500 set_bit(DQ_LASTSET_B
+ QIF_ILIMITS_B
, &dquot
->dq_flags
);
2503 if (di
->d_fieldmask
& FS_DQ_BTIMER
) {
2504 dm
->dqb_btime
= di
->d_btimer
;
2506 set_bit(DQ_LASTSET_B
+ QIF_BTIME_B
, &dquot
->dq_flags
);
2509 if (di
->d_fieldmask
& FS_DQ_ITIMER
) {
2510 dm
->dqb_itime
= di
->d_itimer
;
2512 set_bit(DQ_LASTSET_B
+ QIF_ITIME_B
, &dquot
->dq_flags
);
2516 if (!dm
->dqb_bsoftlimit
||
2517 dm
->dqb_curspace
< dm
->dqb_bsoftlimit
) {
2519 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
2520 } else if (!(di
->d_fieldmask
& FS_DQ_BTIMER
))
2521 /* Set grace only if user hasn't provided his own... */
2522 dm
->dqb_btime
= get_seconds() + dqi
->dqi_bgrace
;
2525 if (!dm
->dqb_isoftlimit
||
2526 dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
2528 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
2529 } else if (!(di
->d_fieldmask
& FS_DQ_ITIMER
))
2530 /* Set grace only if user hasn't provided his own... */
2531 dm
->dqb_itime
= get_seconds() + dqi
->dqi_igrace
;
2533 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
||
2535 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2537 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2538 spin_unlock(&dq_data_lock
);
2539 mark_dquot_dirty(dquot
);
2544 int dquot_set_dqblk(struct super_block
*sb
, struct kqid qid
,
2545 struct fs_disk_quota
*di
)
2547 struct dquot
*dquot
;
2550 dquot
= dqget(sb
, qid
);
2555 rc
= do_set_dqblk(dquot
, di
);
2560 EXPORT_SYMBOL(dquot_set_dqblk
);
2562 /* Generic routine for getting common part of quota file information */
2563 int dquot_get_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2565 struct mem_dqinfo
*mi
;
2567 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2568 if (!sb_has_quota_active(sb
, type
)) {
2569 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2572 mi
= sb_dqopt(sb
)->info
+ type
;
2573 spin_lock(&dq_data_lock
);
2574 ii
->dqi_bgrace
= mi
->dqi_bgrace
;
2575 ii
->dqi_igrace
= mi
->dqi_igrace
;
2576 ii
->dqi_flags
= mi
->dqi_flags
& DQF_GETINFO_MASK
;
2577 ii
->dqi_valid
= IIF_ALL
;
2578 spin_unlock(&dq_data_lock
);
2579 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2582 EXPORT_SYMBOL(dquot_get_dqinfo
);
2584 /* Generic routine for setting common part of quota file information */
2585 int dquot_set_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2587 struct mem_dqinfo
*mi
;
2590 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2591 if (!sb_has_quota_active(sb
, type
)) {
2595 mi
= sb_dqopt(sb
)->info
+ type
;
2596 spin_lock(&dq_data_lock
);
2597 if (ii
->dqi_valid
& IIF_BGRACE
)
2598 mi
->dqi_bgrace
= ii
->dqi_bgrace
;
2599 if (ii
->dqi_valid
& IIF_IGRACE
)
2600 mi
->dqi_igrace
= ii
->dqi_igrace
;
2601 if (ii
->dqi_valid
& IIF_FLAGS
)
2602 mi
->dqi_flags
= (mi
->dqi_flags
& ~DQF_SETINFO_MASK
) |
2603 (ii
->dqi_flags
& DQF_SETINFO_MASK
);
2604 spin_unlock(&dq_data_lock
);
2605 mark_info_dirty(sb
, type
);
2606 /* Force write to disk */
2607 sb
->dq_op
->write_info(sb
, type
);
2609 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2612 EXPORT_SYMBOL(dquot_set_dqinfo
);
2614 const struct quotactl_ops dquot_quotactl_ops
= {
2615 .quota_on
= dquot_quota_on
,
2616 .quota_off
= dquot_quota_off
,
2617 .quota_sync
= dquot_quota_sync
,
2618 .get_info
= dquot_get_dqinfo
,
2619 .set_info
= dquot_set_dqinfo
,
2620 .get_dqblk
= dquot_get_dqblk
,
2621 .set_dqblk
= dquot_set_dqblk
2623 EXPORT_SYMBOL(dquot_quotactl_ops
);
2625 static int do_proc_dqstats(struct ctl_table
*table
, int write
,
2626 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2628 unsigned int type
= (int *)table
->data
- dqstats
.stat
;
2630 /* Update global table */
2631 dqstats
.stat
[type
] =
2632 percpu_counter_sum_positive(&dqstats
.counter
[type
]);
2633 return proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
2636 static struct ctl_table fs_dqstats_table
[] = {
2638 .procname
= "lookups",
2639 .data
= &dqstats
.stat
[DQST_LOOKUPS
],
2640 .maxlen
= sizeof(int),
2642 .proc_handler
= do_proc_dqstats
,
2645 .procname
= "drops",
2646 .data
= &dqstats
.stat
[DQST_DROPS
],
2647 .maxlen
= sizeof(int),
2649 .proc_handler
= do_proc_dqstats
,
2652 .procname
= "reads",
2653 .data
= &dqstats
.stat
[DQST_READS
],
2654 .maxlen
= sizeof(int),
2656 .proc_handler
= do_proc_dqstats
,
2659 .procname
= "writes",
2660 .data
= &dqstats
.stat
[DQST_WRITES
],
2661 .maxlen
= sizeof(int),
2663 .proc_handler
= do_proc_dqstats
,
2666 .procname
= "cache_hits",
2667 .data
= &dqstats
.stat
[DQST_CACHE_HITS
],
2668 .maxlen
= sizeof(int),
2670 .proc_handler
= do_proc_dqstats
,
2673 .procname
= "allocated_dquots",
2674 .data
= &dqstats
.stat
[DQST_ALLOC_DQUOTS
],
2675 .maxlen
= sizeof(int),
2677 .proc_handler
= do_proc_dqstats
,
2680 .procname
= "free_dquots",
2681 .data
= &dqstats
.stat
[DQST_FREE_DQUOTS
],
2682 .maxlen
= sizeof(int),
2684 .proc_handler
= do_proc_dqstats
,
2687 .procname
= "syncs",
2688 .data
= &dqstats
.stat
[DQST_SYNCS
],
2689 .maxlen
= sizeof(int),
2691 .proc_handler
= do_proc_dqstats
,
2693 #ifdef CONFIG_PRINT_QUOTA_WARNING
2695 .procname
= "warnings",
2696 .data
= &flag_print_warnings
,
2697 .maxlen
= sizeof(int),
2699 .proc_handler
= proc_dointvec
,
2705 static struct ctl_table fs_table
[] = {
2707 .procname
= "quota",
2709 .child
= fs_dqstats_table
,
2714 static struct ctl_table sys_table
[] = {
2723 static int __init
dquot_init(void)
2726 unsigned long nr_hash
, order
;
2728 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2730 register_sysctl_table(sys_table
);
2732 dquot_cachep
= kmem_cache_create("dquot",
2733 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2734 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2735 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2739 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
2741 panic("Cannot create dquot hash table");
2743 for (i
= 0; i
< _DQST_DQSTAT_LAST
; i
++) {
2744 ret
= percpu_counter_init(&dqstats
.counter
[i
], 0);
2746 panic("Cannot create dquot stat counters");
2749 /* Find power-of-two hlist_heads which can fit into allocation */
2750 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2754 } while (nr_hash
>> dq_hash_bits
);
2757 nr_hash
= 1UL << dq_hash_bits
;
2758 dq_hash_mask
= nr_hash
- 1;
2759 for (i
= 0; i
< nr_hash
; i
++)
2760 INIT_HLIST_HEAD(dquot_hash
+ i
);
2762 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2763 nr_hash
, order
, (PAGE_SIZE
<< order
));
2765 register_shrinker(&dqcache_shrinker
);
2769 module_init(dquot_init
);