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/cred.h>
76 #include <linux/kmod.h>
77 #include <linux/namei.h>
78 #include <linux/capability.h>
79 #include <linux/quotaops.h>
80 #include "../internal.h" /* ugh */
82 #include <linux/uaccess.h>
85 * There are three quota SMP locks. dq_list_lock protects all lists with quotas
87 * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
88 * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
89 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
90 * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
91 * modifications of quota state (on quotaon and quotaoff) and readers who care
92 * about latest values take it as well.
94 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
95 * dq_list_lock > dq_state_lock
97 * Note that some things (eg. sb pointer, type, id) doesn't change during
98 * the life of the dquot structure and so needn't to be protected by a lock
100 * Operation accessing dquots via inode pointers are protected by dquot_srcu.
101 * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and
102 * synchronize_srcu(&dquot_srcu) is called after clearing pointers from
103 * inode and before dropping dquot references to avoid use of dquots after
104 * they are freed. dq_data_lock is used to serialize the pointer setting and
105 * clearing operations.
106 * Special care needs to be taken about S_NOQUOTA inode flag (marking that
107 * inode is a quota file). Functions adding pointers from inode to dquots have
108 * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they
109 * have to do all pointer modifications before dropping dq_data_lock. This makes
110 * sure they cannot race with quotaon which first sets S_NOQUOTA flag and
111 * then drops all pointers to dquots from an inode.
113 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
114 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
115 * Currently dquot is locked only when it is being read to memory (or space for
116 * it is being allocated) on the first dqget() and when it is being released on
117 * the last dqput(). The allocation and release oparations are serialized by
118 * the dq_lock and by checking the use count in dquot_release(). Write
119 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
120 * spinlock to internal buffers before writing.
122 * Lock ordering (including related VFS locks) is the following:
123 * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_mutex
126 static __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_list_lock
);
127 static __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_state_lock
);
128 __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_data_lock
);
129 EXPORT_SYMBOL(dq_data_lock
);
130 DEFINE_STATIC_SRCU(dquot_srcu
);
132 void __quota_error(struct super_block
*sb
, const char *func
,
133 const char *fmt
, ...)
135 if (printk_ratelimit()) {
137 struct va_format vaf
;
144 printk(KERN_ERR
"Quota error (device %s): %s: %pV\n",
145 sb
->s_id
, func
, &vaf
);
150 EXPORT_SYMBOL(__quota_error
);
152 #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING)
153 static char *quotatypes
[] = INITQFNAMES
;
155 static struct quota_format_type
*quota_formats
; /* List of registered formats */
156 static struct quota_module_name module_names
[] = INIT_QUOTA_MODULE_NAMES
;
158 /* SLAB cache for dquot structures */
159 static struct kmem_cache
*dquot_cachep
;
161 int register_quota_format(struct quota_format_type
*fmt
)
163 spin_lock(&dq_list_lock
);
164 fmt
->qf_next
= quota_formats
;
166 spin_unlock(&dq_list_lock
);
169 EXPORT_SYMBOL(register_quota_format
);
171 void unregister_quota_format(struct quota_format_type
*fmt
)
173 struct quota_format_type
**actqf
;
175 spin_lock(&dq_list_lock
);
176 for (actqf
= "a_formats
; *actqf
&& *actqf
!= fmt
;
177 actqf
= &(*actqf
)->qf_next
)
180 *actqf
= (*actqf
)->qf_next
;
181 spin_unlock(&dq_list_lock
);
183 EXPORT_SYMBOL(unregister_quota_format
);
185 static struct quota_format_type
*find_quota_format(int id
)
187 struct quota_format_type
*actqf
;
189 spin_lock(&dq_list_lock
);
190 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
191 actqf
= actqf
->qf_next
)
193 if (!actqf
|| !try_module_get(actqf
->qf_owner
)) {
196 spin_unlock(&dq_list_lock
);
198 for (qm
= 0; module_names
[qm
].qm_fmt_id
&&
199 module_names
[qm
].qm_fmt_id
!= id
; qm
++)
201 if (!module_names
[qm
].qm_fmt_id
||
202 request_module(module_names
[qm
].qm_mod_name
))
205 spin_lock(&dq_list_lock
);
206 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
207 actqf
= actqf
->qf_next
)
209 if (actqf
&& !try_module_get(actqf
->qf_owner
))
212 spin_unlock(&dq_list_lock
);
216 static void put_quota_format(struct quota_format_type
*fmt
)
218 module_put(fmt
->qf_owner
);
222 * Dquot List Management:
223 * The quota code uses three lists for dquot management: the inuse_list,
224 * free_dquots, and dquot_hash[] array. A single dquot structure may be
225 * on all three lists, depending on its current state.
227 * All dquots are placed to the end of inuse_list when first created, and this
228 * list is used for invalidate operation, which must look at every dquot.
230 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
231 * and this list is searched whenever we need an available dquot. Dquots are
232 * removed from the list as soon as they are used again, and
233 * dqstats.free_dquots gives the number of dquots on the list. When
234 * dquot is invalidated it's completely released from memory.
236 * Dquots with a specific identity (device, type and id) are placed on
237 * one of the dquot_hash[] hash chains. The provides an efficient search
238 * mechanism to locate a specific dquot.
241 static LIST_HEAD(inuse_list
);
242 static LIST_HEAD(free_dquots
);
243 static unsigned int dq_hash_bits
, dq_hash_mask
;
244 static struct hlist_head
*dquot_hash
;
246 struct dqstats dqstats
;
247 EXPORT_SYMBOL(dqstats
);
249 static qsize_t
inode_get_rsv_space(struct inode
*inode
);
250 static int __dquot_initialize(struct inode
*inode
, int type
);
252 static inline unsigned int
253 hashfn(const struct super_block
*sb
, struct kqid qid
)
255 unsigned int id
= from_kqid(&init_user_ns
, qid
);
259 tmp
= (((unsigned long)sb
>>L1_CACHE_SHIFT
) ^ id
) * (MAXQUOTAS
- type
);
260 return (tmp
+ (tmp
>> dq_hash_bits
)) & dq_hash_mask
;
264 * Following list functions expect dq_list_lock to be held
266 static inline void insert_dquot_hash(struct dquot
*dquot
)
268 struct hlist_head
*head
;
269 head
= dquot_hash
+ hashfn(dquot
->dq_sb
, dquot
->dq_id
);
270 hlist_add_head(&dquot
->dq_hash
, head
);
273 static inline void remove_dquot_hash(struct dquot
*dquot
)
275 hlist_del_init(&dquot
->dq_hash
);
278 static struct dquot
*find_dquot(unsigned int hashent
, struct super_block
*sb
,
281 struct hlist_node
*node
;
284 hlist_for_each (node
, dquot_hash
+hashent
) {
285 dquot
= hlist_entry(node
, struct dquot
, dq_hash
);
286 if (dquot
->dq_sb
== sb
&& qid_eq(dquot
->dq_id
, qid
))
292 /* Add a dquot to the tail of the free list */
293 static inline void put_dquot_last(struct dquot
*dquot
)
295 list_add_tail(&dquot
->dq_free
, &free_dquots
);
296 dqstats_inc(DQST_FREE_DQUOTS
);
299 static inline void remove_free_dquot(struct dquot
*dquot
)
301 if (list_empty(&dquot
->dq_free
))
303 list_del_init(&dquot
->dq_free
);
304 dqstats_dec(DQST_FREE_DQUOTS
);
307 static inline void put_inuse(struct dquot
*dquot
)
309 /* We add to the back of inuse list so we don't have to restart
310 * when traversing this list and we block */
311 list_add_tail(&dquot
->dq_inuse
, &inuse_list
);
312 dqstats_inc(DQST_ALLOC_DQUOTS
);
315 static inline void remove_inuse(struct dquot
*dquot
)
317 dqstats_dec(DQST_ALLOC_DQUOTS
);
318 list_del(&dquot
->dq_inuse
);
321 * End of list functions needing dq_list_lock
324 static void wait_on_dquot(struct dquot
*dquot
)
326 mutex_lock(&dquot
->dq_lock
);
327 mutex_unlock(&dquot
->dq_lock
);
330 static inline int dquot_dirty(struct dquot
*dquot
)
332 return test_bit(DQ_MOD_B
, &dquot
->dq_flags
);
335 static inline int mark_dquot_dirty(struct dquot
*dquot
)
337 return dquot
->dq_sb
->dq_op
->mark_dirty(dquot
);
340 /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */
341 int dquot_mark_dquot_dirty(struct dquot
*dquot
)
345 /* If quota is dirty already, we don't have to acquire dq_list_lock */
346 if (test_bit(DQ_MOD_B
, &dquot
->dq_flags
))
349 spin_lock(&dq_list_lock
);
350 if (!test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
)) {
351 list_add(&dquot
->dq_dirty
, &sb_dqopt(dquot
->dq_sb
)->
352 info
[dquot
->dq_id
.type
].dqi_dirty_list
);
355 spin_unlock(&dq_list_lock
);
358 EXPORT_SYMBOL(dquot_mark_dquot_dirty
);
360 /* Dirtify all the dquots - this can block when journalling */
361 static inline int mark_all_dquot_dirty(struct dquot
* const *dquot
)
366 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
368 /* Even in case of error we have to continue */
369 ret
= mark_dquot_dirty(dquot
[cnt
]);
376 static inline void dqput_all(struct dquot
**dquot
)
380 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
384 /* This function needs dq_list_lock */
385 static inline int clear_dquot_dirty(struct dquot
*dquot
)
387 if (!test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
))
389 list_del_init(&dquot
->dq_dirty
);
393 void mark_info_dirty(struct super_block
*sb
, int type
)
395 set_bit(DQF_INFO_DIRTY_B
, &sb_dqopt(sb
)->info
[type
].dqi_flags
);
397 EXPORT_SYMBOL(mark_info_dirty
);
400 * Read dquot from disk and alloc space for it
403 int dquot_acquire(struct dquot
*dquot
)
405 int ret
= 0, ret2
= 0;
406 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
408 mutex_lock(&dquot
->dq_lock
);
409 mutex_lock(&dqopt
->dqio_mutex
);
410 if (!test_bit(DQ_READ_B
, &dquot
->dq_flags
))
411 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->read_dqblk(dquot
);
414 /* Make sure flags update is visible after dquot has been filled */
415 smp_mb__before_atomic();
416 set_bit(DQ_READ_B
, &dquot
->dq_flags
);
417 /* Instantiate dquot if needed */
418 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && !dquot
->dq_off
) {
419 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->commit_dqblk(dquot
);
420 /* Write the info if needed */
421 if (info_dirty(&dqopt
->info
[dquot
->dq_id
.type
])) {
422 ret2
= dqopt
->ops
[dquot
->dq_id
.type
]->write_file_info(
423 dquot
->dq_sb
, dquot
->dq_id
.type
);
433 * Make sure flags update is visible after on-disk struct has been
434 * allocated. Paired with smp_rmb() in dqget().
436 smp_mb__before_atomic();
437 set_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
439 mutex_unlock(&dqopt
->dqio_mutex
);
440 mutex_unlock(&dquot
->dq_lock
);
443 EXPORT_SYMBOL(dquot_acquire
);
446 * Write dquot to disk
448 int dquot_commit(struct dquot
*dquot
)
451 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
453 mutex_lock(&dqopt
->dqio_mutex
);
454 spin_lock(&dq_list_lock
);
455 if (!clear_dquot_dirty(dquot
)) {
456 spin_unlock(&dq_list_lock
);
459 spin_unlock(&dq_list_lock
);
460 /* Inactive dquot can be only if there was error during read/init
461 * => we have better not writing it */
462 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
463 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->commit_dqblk(dquot
);
467 mutex_unlock(&dqopt
->dqio_mutex
);
470 EXPORT_SYMBOL(dquot_commit
);
475 int dquot_release(struct dquot
*dquot
)
477 int ret
= 0, ret2
= 0;
478 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
480 mutex_lock(&dquot
->dq_lock
);
481 /* Check whether we are not racing with some other dqget() */
482 if (atomic_read(&dquot
->dq_count
) > 1)
484 mutex_lock(&dqopt
->dqio_mutex
);
485 if (dqopt
->ops
[dquot
->dq_id
.type
]->release_dqblk
) {
486 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->release_dqblk(dquot
);
488 if (info_dirty(&dqopt
->info
[dquot
->dq_id
.type
])) {
489 ret2
= dqopt
->ops
[dquot
->dq_id
.type
]->write_file_info(
490 dquot
->dq_sb
, dquot
->dq_id
.type
);
495 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
496 mutex_unlock(&dqopt
->dqio_mutex
);
498 mutex_unlock(&dquot
->dq_lock
);
501 EXPORT_SYMBOL(dquot_release
);
503 void dquot_destroy(struct dquot
*dquot
)
505 kmem_cache_free(dquot_cachep
, dquot
);
507 EXPORT_SYMBOL(dquot_destroy
);
509 static inline void do_destroy_dquot(struct dquot
*dquot
)
511 dquot
->dq_sb
->dq_op
->destroy_dquot(dquot
);
514 /* Invalidate all dquots on the list. Note that this function is called after
515 * quota is disabled and pointers from inodes removed so there cannot be new
516 * quota users. There can still be some users of quotas due to inodes being
517 * just deleted or pruned by prune_icache() (those are not attached to any
518 * list) or parallel quotactl call. We have to wait for such users.
520 static void invalidate_dquots(struct super_block
*sb
, int type
)
522 struct dquot
*dquot
, *tmp
;
525 spin_lock(&dq_list_lock
);
526 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
527 if (dquot
->dq_sb
!= sb
)
529 if (dquot
->dq_id
.type
!= type
)
531 /* Wait for dquot users */
532 if (atomic_read(&dquot
->dq_count
)) {
536 prepare_to_wait(&dquot
->dq_wait_unused
, &wait
,
537 TASK_UNINTERRUPTIBLE
);
538 spin_unlock(&dq_list_lock
);
539 /* Once dqput() wakes us up, we know it's time to free
541 * IMPORTANT: we rely on the fact that there is always
542 * at most one process waiting for dquot to free.
543 * Otherwise dq_count would be > 1 and we would never
546 if (atomic_read(&dquot
->dq_count
) > 1)
548 finish_wait(&dquot
->dq_wait_unused
, &wait
);
550 /* At this moment dquot() need not exist (it could be
551 * reclaimed by prune_dqcache(). Hence we must
556 * Quota now has no users and it has been written on last
559 remove_dquot_hash(dquot
);
560 remove_free_dquot(dquot
);
562 do_destroy_dquot(dquot
);
564 spin_unlock(&dq_list_lock
);
567 /* Call callback for every active dquot on given filesystem */
568 int dquot_scan_active(struct super_block
*sb
,
569 int (*fn
)(struct dquot
*dquot
, unsigned long priv
),
572 struct dquot
*dquot
, *old_dquot
= NULL
;
575 WARN_ON_ONCE(!rwsem_is_locked(&sb
->s_umount
));
577 spin_lock(&dq_list_lock
);
578 list_for_each_entry(dquot
, &inuse_list
, dq_inuse
) {
579 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
581 if (dquot
->dq_sb
!= sb
)
583 /* Now we have active dquot so we can just increase use count */
584 atomic_inc(&dquot
->dq_count
);
585 spin_unlock(&dq_list_lock
);
586 dqstats_inc(DQST_LOOKUPS
);
590 * ->release_dquot() can be racing with us. Our reference
591 * protects us from new calls to it so just wait for any
592 * outstanding call and recheck the DQ_ACTIVE_B after that.
594 wait_on_dquot(dquot
);
595 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
596 ret
= fn(dquot
, priv
);
600 spin_lock(&dq_list_lock
);
601 /* We are safe to continue now because our dquot could not
602 * be moved out of the inuse list while we hold the reference */
604 spin_unlock(&dq_list_lock
);
609 EXPORT_SYMBOL(dquot_scan_active
);
611 /* Write all dquot structures to quota files */
612 int dquot_writeback_dquots(struct super_block
*sb
, int type
)
614 struct list_head
*dirty
;
616 struct quota_info
*dqopt
= sb_dqopt(sb
);
620 WARN_ON_ONCE(!rwsem_is_locked(&sb
->s_umount
));
622 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
623 if (type
!= -1 && cnt
!= type
)
625 if (!sb_has_quota_active(sb
, cnt
))
627 spin_lock(&dq_list_lock
);
628 dirty
= &dqopt
->info
[cnt
].dqi_dirty_list
;
629 while (!list_empty(dirty
)) {
630 dquot
= list_first_entry(dirty
, struct dquot
,
632 /* Dirty and inactive can be only bad dquot... */
633 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
634 clear_dquot_dirty(dquot
);
637 /* Now we have active dquot from which someone is
638 * holding reference so we can safely just increase
641 spin_unlock(&dq_list_lock
);
642 dqstats_inc(DQST_LOOKUPS
);
643 err
= sb
->dq_op
->write_dquot(dquot
);
647 spin_lock(&dq_list_lock
);
649 spin_unlock(&dq_list_lock
);
652 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
653 if ((cnt
== type
|| type
== -1) && sb_has_quota_active(sb
, cnt
)
654 && info_dirty(&dqopt
->info
[cnt
]))
655 sb
->dq_op
->write_info(sb
, cnt
);
656 dqstats_inc(DQST_SYNCS
);
660 EXPORT_SYMBOL(dquot_writeback_dquots
);
662 /* Write all dquot structures to disk and make them visible from userspace */
663 int dquot_quota_sync(struct super_block
*sb
, int type
)
665 struct quota_info
*dqopt
= sb_dqopt(sb
);
669 ret
= dquot_writeback_dquots(sb
, type
);
672 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
675 /* This is not very clever (and fast) but currently I don't know about
676 * any other simple way of getting quota data to disk and we must get
677 * them there for userspace to be visible... */
678 if (sb
->s_op
->sync_fs
)
679 sb
->s_op
->sync_fs(sb
, 1);
680 sync_blockdev(sb
->s_bdev
);
683 * Now when everything is written we can discard the pagecache so
684 * that userspace sees the changes.
686 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
687 if (type
!= -1 && cnt
!= type
)
689 if (!sb_has_quota_active(sb
, cnt
))
691 inode_lock(dqopt
->files
[cnt
]);
692 truncate_inode_pages(&dqopt
->files
[cnt
]->i_data
, 0);
693 inode_unlock(dqopt
->files
[cnt
]);
698 EXPORT_SYMBOL(dquot_quota_sync
);
701 dqcache_shrink_scan(struct shrinker
*shrink
, struct shrink_control
*sc
)
703 struct list_head
*head
;
705 unsigned long freed
= 0;
707 spin_lock(&dq_list_lock
);
708 head
= free_dquots
.prev
;
709 while (head
!= &free_dquots
&& sc
->nr_to_scan
) {
710 dquot
= list_entry(head
, struct dquot
, dq_free
);
711 remove_dquot_hash(dquot
);
712 remove_free_dquot(dquot
);
714 do_destroy_dquot(dquot
);
717 head
= free_dquots
.prev
;
719 spin_unlock(&dq_list_lock
);
724 dqcache_shrink_count(struct shrinker
*shrink
, struct shrink_control
*sc
)
726 return vfs_pressure_ratio(
727 percpu_counter_read_positive(&dqstats
.counter
[DQST_FREE_DQUOTS
]));
730 static struct shrinker dqcache_shrinker
= {
731 .count_objects
= dqcache_shrink_count
,
732 .scan_objects
= dqcache_shrink_scan
,
733 .seeks
= DEFAULT_SEEKS
,
737 * Put reference to dquot
739 void dqput(struct dquot
*dquot
)
745 #ifdef CONFIG_QUOTA_DEBUG
746 if (!atomic_read(&dquot
->dq_count
)) {
747 quota_error(dquot
->dq_sb
, "trying to free free dquot of %s %d",
748 quotatypes
[dquot
->dq_id
.type
],
749 from_kqid(&init_user_ns
, dquot
->dq_id
));
753 dqstats_inc(DQST_DROPS
);
755 spin_lock(&dq_list_lock
);
756 if (atomic_read(&dquot
->dq_count
) > 1) {
757 /* We have more than one user... nothing to do */
758 atomic_dec(&dquot
->dq_count
);
759 /* Releasing dquot during quotaoff phase? */
760 if (!sb_has_quota_active(dquot
->dq_sb
, dquot
->dq_id
.type
) &&
761 atomic_read(&dquot
->dq_count
) == 1)
762 wake_up(&dquot
->dq_wait_unused
);
763 spin_unlock(&dq_list_lock
);
766 /* Need to release dquot? */
767 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && dquot_dirty(dquot
)) {
768 spin_unlock(&dq_list_lock
);
769 /* Commit dquot before releasing */
770 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
772 quota_error(dquot
->dq_sb
, "Can't write quota structure"
773 " (error %d). Quota may get out of sync!",
776 * We clear dirty bit anyway, so that we avoid
779 spin_lock(&dq_list_lock
);
780 clear_dquot_dirty(dquot
);
781 spin_unlock(&dq_list_lock
);
785 /* Clear flag in case dquot was inactive (something bad happened) */
786 clear_dquot_dirty(dquot
);
787 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
788 spin_unlock(&dq_list_lock
);
789 dquot
->dq_sb
->dq_op
->release_dquot(dquot
);
792 atomic_dec(&dquot
->dq_count
);
793 #ifdef CONFIG_QUOTA_DEBUG
795 BUG_ON(!list_empty(&dquot
->dq_free
));
797 put_dquot_last(dquot
);
798 spin_unlock(&dq_list_lock
);
800 EXPORT_SYMBOL(dqput
);
802 struct dquot
*dquot_alloc(struct super_block
*sb
, int type
)
804 return kmem_cache_zalloc(dquot_cachep
, GFP_NOFS
);
806 EXPORT_SYMBOL(dquot_alloc
);
808 static struct dquot
*get_empty_dquot(struct super_block
*sb
, int type
)
812 dquot
= sb
->dq_op
->alloc_dquot(sb
, type
);
816 mutex_init(&dquot
->dq_lock
);
817 INIT_LIST_HEAD(&dquot
->dq_free
);
818 INIT_LIST_HEAD(&dquot
->dq_inuse
);
819 INIT_HLIST_NODE(&dquot
->dq_hash
);
820 INIT_LIST_HEAD(&dquot
->dq_dirty
);
821 init_waitqueue_head(&dquot
->dq_wait_unused
);
823 dquot
->dq_id
= make_kqid_invalid(type
);
824 atomic_set(&dquot
->dq_count
, 1);
830 * Get reference to dquot
832 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
833 * destroying our dquot by:
834 * a) checking for quota flags under dq_list_lock and
835 * b) getting a reference to dquot before we release dq_list_lock
837 struct dquot
*dqget(struct super_block
*sb
, struct kqid qid
)
839 unsigned int hashent
= hashfn(sb
, qid
);
840 struct dquot
*dquot
, *empty
= NULL
;
842 if (!qid_has_mapping(sb
->s_user_ns
, qid
))
843 return ERR_PTR(-EINVAL
);
845 if (!sb_has_quota_active(sb
, qid
.type
))
846 return ERR_PTR(-ESRCH
);
848 spin_lock(&dq_list_lock
);
849 spin_lock(&dq_state_lock
);
850 if (!sb_has_quota_active(sb
, qid
.type
)) {
851 spin_unlock(&dq_state_lock
);
852 spin_unlock(&dq_list_lock
);
853 dquot
= ERR_PTR(-ESRCH
);
856 spin_unlock(&dq_state_lock
);
858 dquot
= find_dquot(hashent
, sb
, qid
);
861 spin_unlock(&dq_list_lock
);
862 empty
= get_empty_dquot(sb
, qid
.type
);
864 schedule(); /* Try to wait for a moment... */
870 /* all dquots go on the inuse_list */
872 /* hash it first so it can be found */
873 insert_dquot_hash(dquot
);
874 spin_unlock(&dq_list_lock
);
875 dqstats_inc(DQST_LOOKUPS
);
877 if (!atomic_read(&dquot
->dq_count
))
878 remove_free_dquot(dquot
);
879 atomic_inc(&dquot
->dq_count
);
880 spin_unlock(&dq_list_lock
);
881 dqstats_inc(DQST_CACHE_HITS
);
882 dqstats_inc(DQST_LOOKUPS
);
884 /* Wait for dq_lock - after this we know that either dquot_release() is
885 * already finished or it will be canceled due to dq_count > 1 test */
886 wait_on_dquot(dquot
);
887 /* Read the dquot / allocate space in quota file */
888 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
891 err
= sb
->dq_op
->acquire_dquot(dquot
);
894 dquot
= ERR_PTR(err
);
899 * Make sure following reads see filled structure - paired with
900 * smp_mb__before_atomic() in dquot_acquire().
903 #ifdef CONFIG_QUOTA_DEBUG
904 BUG_ON(!dquot
->dq_sb
); /* Has somebody invalidated entry under us? */
908 do_destroy_dquot(empty
);
912 EXPORT_SYMBOL(dqget
);
914 static inline struct dquot
**i_dquot(struct inode
*inode
)
916 return inode
->i_sb
->s_op
->get_dquots(inode
);
919 static int dqinit_needed(struct inode
*inode
, int type
)
921 struct dquot
* const *dquots
;
924 if (IS_NOQUOTA(inode
))
927 dquots
= i_dquot(inode
);
929 return !dquots
[type
];
930 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
936 /* This routine is guarded by s_umount semaphore */
937 static void add_dquot_ref(struct super_block
*sb
, int type
)
939 struct inode
*inode
, *old_inode
= NULL
;
940 #ifdef CONFIG_QUOTA_DEBUG
944 spin_lock(&sb
->s_inode_list_lock
);
945 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
946 spin_lock(&inode
->i_lock
);
947 if ((inode
->i_state
& (I_FREEING
|I_WILL_FREE
|I_NEW
)) ||
948 !atomic_read(&inode
->i_writecount
) ||
949 !dqinit_needed(inode
, type
)) {
950 spin_unlock(&inode
->i_lock
);
954 spin_unlock(&inode
->i_lock
);
955 spin_unlock(&sb
->s_inode_list_lock
);
957 #ifdef CONFIG_QUOTA_DEBUG
958 if (unlikely(inode_get_rsv_space(inode
) > 0))
962 __dquot_initialize(inode
, type
);
965 * We hold a reference to 'inode' so it couldn't have been
966 * removed from s_inodes list while we dropped the
967 * s_inode_list_lock. We cannot iput the inode now as we can be
968 * holding the last reference and we cannot iput it under
969 * s_inode_list_lock. So we keep the reference and iput it
973 spin_lock(&sb
->s_inode_list_lock
);
975 spin_unlock(&sb
->s_inode_list_lock
);
978 #ifdef CONFIG_QUOTA_DEBUG
980 quota_error(sb
, "Writes happened before quota was turned on "
981 "thus quota information is probably inconsistent. "
982 "Please run quotacheck(8)");
988 * Remove references to dquots from inode and add dquot to list for freeing
989 * if we have the last reference to dquot
991 static void remove_inode_dquot_ref(struct inode
*inode
, int type
,
992 struct list_head
*tofree_head
)
994 struct dquot
**dquots
= i_dquot(inode
);
995 struct dquot
*dquot
= dquots
[type
];
1000 dquots
[type
] = NULL
;
1001 if (list_empty(&dquot
->dq_free
)) {
1003 * The inode still has reference to dquot so it can't be in the
1006 spin_lock(&dq_list_lock
);
1007 list_add(&dquot
->dq_free
, tofree_head
);
1008 spin_unlock(&dq_list_lock
);
1011 * Dquot is already in a list to put so we won't drop the last
1019 * Free list of dquots
1020 * Dquots are removed from inodes and no new references can be got so we are
1021 * the only ones holding reference
1023 static void put_dquot_list(struct list_head
*tofree_head
)
1025 struct list_head
*act_head
;
1026 struct dquot
*dquot
;
1028 act_head
= tofree_head
->next
;
1029 while (act_head
!= tofree_head
) {
1030 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
1031 act_head
= act_head
->next
;
1032 /* Remove dquot from the list so we won't have problems... */
1033 list_del_init(&dquot
->dq_free
);
1038 static void remove_dquot_ref(struct super_block
*sb
, int type
,
1039 struct list_head
*tofree_head
)
1041 struct inode
*inode
;
1044 spin_lock(&sb
->s_inode_list_lock
);
1045 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
1047 * We have to scan also I_NEW inodes because they can already
1048 * have quota pointer initialized. Luckily, we need to touch
1049 * only quota pointers and these have separate locking
1052 spin_lock(&dq_data_lock
);
1053 if (!IS_NOQUOTA(inode
)) {
1054 if (unlikely(inode_get_rsv_space(inode
) > 0))
1056 remove_inode_dquot_ref(inode
, type
, tofree_head
);
1058 spin_unlock(&dq_data_lock
);
1060 spin_unlock(&sb
->s_inode_list_lock
);
1061 #ifdef CONFIG_QUOTA_DEBUG
1063 printk(KERN_WARNING
"VFS (%s): Writes happened after quota"
1064 " was disabled thus quota information is probably "
1065 "inconsistent. Please run quotacheck(8).\n", sb
->s_id
);
1070 /* Gather all references from inodes and drop them */
1071 static void drop_dquot_ref(struct super_block
*sb
, int type
)
1073 LIST_HEAD(tofree_head
);
1076 remove_dquot_ref(sb
, type
, &tofree_head
);
1077 synchronize_srcu(&dquot_srcu
);
1078 put_dquot_list(&tofree_head
);
1082 static inline void dquot_incr_inodes(struct dquot
*dquot
, qsize_t number
)
1084 dquot
->dq_dqb
.dqb_curinodes
+= number
;
1087 static inline void dquot_incr_space(struct dquot
*dquot
, qsize_t number
)
1089 dquot
->dq_dqb
.dqb_curspace
+= number
;
1092 static inline void dquot_resv_space(struct dquot
*dquot
, qsize_t number
)
1094 dquot
->dq_dqb
.dqb_rsvspace
+= number
;
1098 * Claim reserved quota space
1100 static void dquot_claim_reserved_space(struct dquot
*dquot
, qsize_t number
)
1102 if (dquot
->dq_dqb
.dqb_rsvspace
< number
) {
1104 number
= dquot
->dq_dqb
.dqb_rsvspace
;
1106 dquot
->dq_dqb
.dqb_curspace
+= number
;
1107 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1110 static void dquot_reclaim_reserved_space(struct dquot
*dquot
, qsize_t number
)
1112 if (WARN_ON_ONCE(dquot
->dq_dqb
.dqb_curspace
< number
))
1113 number
= dquot
->dq_dqb
.dqb_curspace
;
1114 dquot
->dq_dqb
.dqb_rsvspace
+= number
;
1115 dquot
->dq_dqb
.dqb_curspace
-= number
;
1119 void dquot_free_reserved_space(struct dquot
*dquot
, qsize_t number
)
1121 if (dquot
->dq_dqb
.dqb_rsvspace
>= number
)
1122 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1125 dquot
->dq_dqb
.dqb_rsvspace
= 0;
1129 static void dquot_decr_inodes(struct dquot
*dquot
, qsize_t number
)
1131 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1132 dquot
->dq_dqb
.dqb_curinodes
>= number
)
1133 dquot
->dq_dqb
.dqb_curinodes
-= number
;
1135 dquot
->dq_dqb
.dqb_curinodes
= 0;
1136 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1137 dquot
->dq_dqb
.dqb_itime
= (time64_t
) 0;
1138 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
1141 static void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
1143 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1144 dquot
->dq_dqb
.dqb_curspace
>= number
)
1145 dquot
->dq_dqb
.dqb_curspace
-= number
;
1147 dquot
->dq_dqb
.dqb_curspace
= 0;
1148 if (dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1149 dquot
->dq_dqb
.dqb_btime
= (time64_t
) 0;
1150 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1154 struct super_block
*w_sb
;
1155 struct kqid w_dq_id
;
1159 static int warning_issued(struct dquot
*dquot
, const int warntype
)
1161 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
1162 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
1163 ((warntype
== QUOTA_NL_IHARDWARN
||
1164 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
1168 return test_and_set_bit(flag
, &dquot
->dq_flags
);
1171 #ifdef CONFIG_PRINT_QUOTA_WARNING
1172 static int flag_print_warnings
= 1;
1174 static int need_print_warning(struct dquot_warn
*warn
)
1176 if (!flag_print_warnings
)
1179 switch (warn
->w_dq_id
.type
) {
1181 return uid_eq(current_fsuid(), warn
->w_dq_id
.uid
);
1183 return in_group_p(warn
->w_dq_id
.gid
);
1190 /* Print warning to user which exceeded quota */
1191 static void print_warning(struct dquot_warn
*warn
)
1194 struct tty_struct
*tty
;
1195 int warntype
= warn
->w_type
;
1197 if (warntype
== QUOTA_NL_IHARDBELOW
||
1198 warntype
== QUOTA_NL_ISOFTBELOW
||
1199 warntype
== QUOTA_NL_BHARDBELOW
||
1200 warntype
== QUOTA_NL_BSOFTBELOW
|| !need_print_warning(warn
))
1203 tty
= get_current_tty();
1206 tty_write_message(tty
, warn
->w_sb
->s_id
);
1207 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
1208 tty_write_message(tty
, ": warning, ");
1210 tty_write_message(tty
, ": write failed, ");
1211 tty_write_message(tty
, quotatypes
[warn
->w_dq_id
.type
]);
1213 case QUOTA_NL_IHARDWARN
:
1214 msg
= " file limit reached.\r\n";
1216 case QUOTA_NL_ISOFTLONGWARN
:
1217 msg
= " file quota exceeded too long.\r\n";
1219 case QUOTA_NL_ISOFTWARN
:
1220 msg
= " file quota exceeded.\r\n";
1222 case QUOTA_NL_BHARDWARN
:
1223 msg
= " block limit reached.\r\n";
1225 case QUOTA_NL_BSOFTLONGWARN
:
1226 msg
= " block quota exceeded too long.\r\n";
1228 case QUOTA_NL_BSOFTWARN
:
1229 msg
= " block quota exceeded.\r\n";
1232 tty_write_message(tty
, msg
);
1237 static void prepare_warning(struct dquot_warn
*warn
, struct dquot
*dquot
,
1240 if (warning_issued(dquot
, warntype
))
1242 warn
->w_type
= warntype
;
1243 warn
->w_sb
= dquot
->dq_sb
;
1244 warn
->w_dq_id
= dquot
->dq_id
;
1248 * Write warnings to the console and send warning messages over netlink.
1250 * Note that this function can call into tty and networking code.
1252 static void flush_warnings(struct dquot_warn
*warn
)
1256 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1257 if (warn
[i
].w_type
== QUOTA_NL_NOWARN
)
1259 #ifdef CONFIG_PRINT_QUOTA_WARNING
1260 print_warning(&warn
[i
]);
1262 quota_send_warning(warn
[i
].w_dq_id
,
1263 warn
[i
].w_sb
->s_dev
, warn
[i
].w_type
);
1267 static int ignore_hardlimit(struct dquot
*dquot
)
1269 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
];
1271 return capable(CAP_SYS_RESOURCE
) &&
1272 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
||
1273 !(info
->dqi_flags
& DQF_ROOT_SQUASH
));
1276 /* needs dq_data_lock */
1277 static int check_idq(struct dquot
*dquot
, qsize_t inodes
,
1278 struct dquot_warn
*warn
)
1280 qsize_t newinodes
= dquot
->dq_dqb
.dqb_curinodes
+ inodes
;
1282 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_id
.type
) ||
1283 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1286 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1287 newinodes
> dquot
->dq_dqb
.dqb_ihardlimit
&&
1288 !ignore_hardlimit(dquot
)) {
1289 prepare_warning(warn
, dquot
, QUOTA_NL_IHARDWARN
);
1293 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1294 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1295 dquot
->dq_dqb
.dqb_itime
&&
1296 ktime_get_real_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1297 !ignore_hardlimit(dquot
)) {
1298 prepare_warning(warn
, dquot
, QUOTA_NL_ISOFTLONGWARN
);
1302 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1303 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1304 dquot
->dq_dqb
.dqb_itime
== 0) {
1305 prepare_warning(warn
, dquot
, QUOTA_NL_ISOFTWARN
);
1306 dquot
->dq_dqb
.dqb_itime
= ktime_get_real_seconds() +
1307 sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
].dqi_igrace
;
1313 /* needs dq_data_lock */
1314 static int check_bdq(struct dquot
*dquot
, qsize_t space
, int prealloc
,
1315 struct dquot_warn
*warn
)
1318 struct super_block
*sb
= dquot
->dq_sb
;
1320 if (!sb_has_quota_limits_enabled(sb
, dquot
->dq_id
.type
) ||
1321 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1324 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
1327 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1328 tspace
> dquot
->dq_dqb
.dqb_bhardlimit
&&
1329 !ignore_hardlimit(dquot
)) {
1331 prepare_warning(warn
, dquot
, QUOTA_NL_BHARDWARN
);
1335 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1336 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1337 dquot
->dq_dqb
.dqb_btime
&&
1338 ktime_get_real_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1339 !ignore_hardlimit(dquot
)) {
1341 prepare_warning(warn
, dquot
, QUOTA_NL_BSOFTLONGWARN
);
1345 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1346 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1347 dquot
->dq_dqb
.dqb_btime
== 0) {
1349 prepare_warning(warn
, dquot
, QUOTA_NL_BSOFTWARN
);
1350 dquot
->dq_dqb
.dqb_btime
= ktime_get_real_seconds() +
1351 sb_dqopt(sb
)->info
[dquot
->dq_id
.type
].dqi_bgrace
;
1355 * We don't allow preallocation to exceed softlimit so exceeding will
1364 static int info_idq_free(struct dquot
*dquot
, qsize_t inodes
)
1368 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1369 dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
||
1370 !sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_id
.type
))
1371 return QUOTA_NL_NOWARN
;
1373 newinodes
= dquot
->dq_dqb
.dqb_curinodes
- inodes
;
1374 if (newinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1375 return QUOTA_NL_ISOFTBELOW
;
1376 if (dquot
->dq_dqb
.dqb_curinodes
>= dquot
->dq_dqb
.dqb_ihardlimit
&&
1377 newinodes
< dquot
->dq_dqb
.dqb_ihardlimit
)
1378 return QUOTA_NL_IHARDBELOW
;
1379 return QUOTA_NL_NOWARN
;
1382 static int info_bdq_free(struct dquot
*dquot
, qsize_t space
)
1384 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1385 dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1386 return QUOTA_NL_NOWARN
;
1388 if (dquot
->dq_dqb
.dqb_curspace
- space
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1389 return QUOTA_NL_BSOFTBELOW
;
1390 if (dquot
->dq_dqb
.dqb_curspace
>= dquot
->dq_dqb
.dqb_bhardlimit
&&
1391 dquot
->dq_dqb
.dqb_curspace
- space
< dquot
->dq_dqb
.dqb_bhardlimit
)
1392 return QUOTA_NL_BHARDBELOW
;
1393 return QUOTA_NL_NOWARN
;
1396 static int dquot_active(const struct inode
*inode
)
1398 struct super_block
*sb
= inode
->i_sb
;
1400 if (IS_NOQUOTA(inode
))
1402 return sb_any_quota_loaded(sb
) & ~sb_any_quota_suspended(sb
);
1406 * Initialize quota pointers in inode
1408 * It is better to call this function outside of any transaction as it
1409 * might need a lot of space in journal for dquot structure allocation.
1411 static int __dquot_initialize(struct inode
*inode
, int type
)
1413 int cnt
, init_needed
= 0;
1414 struct dquot
**dquots
, *got
[MAXQUOTAS
] = {};
1415 struct super_block
*sb
= inode
->i_sb
;
1419 if (!dquot_active(inode
))
1422 dquots
= i_dquot(inode
);
1424 /* First get references to structures we might need. */
1425 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1429 struct dquot
*dquot
;
1431 if (type
!= -1 && cnt
!= type
)
1434 * The i_dquot should have been initialized in most cases,
1435 * we check it without locking here to avoid unnecessary
1436 * dqget()/dqput() calls.
1441 if (!sb_has_quota_active(sb
, cnt
))
1448 qid
= make_kqid_uid(inode
->i_uid
);
1451 qid
= make_kqid_gid(inode
->i_gid
);
1454 rc
= inode
->i_sb
->dq_op
->get_projid(inode
, &projid
);
1457 qid
= make_kqid_projid(projid
);
1460 dquot
= dqget(sb
, qid
);
1461 if (IS_ERR(dquot
)) {
1462 /* We raced with somebody turning quotas off... */
1463 if (PTR_ERR(dquot
) != -ESRCH
) {
1464 ret
= PTR_ERR(dquot
);
1472 /* All required i_dquot has been initialized */
1476 spin_lock(&dq_data_lock
);
1477 if (IS_NOQUOTA(inode
))
1479 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1480 if (type
!= -1 && cnt
!= type
)
1482 /* Avoid races with quotaoff() */
1483 if (!sb_has_quota_active(sb
, cnt
))
1485 /* We could race with quotaon or dqget() could have failed */
1489 dquots
[cnt
] = got
[cnt
];
1492 * Make quota reservation system happy if someone
1493 * did a write before quota was turned on
1495 rsv
= inode_get_rsv_space(inode
);
1497 dquot_resv_space(dquots
[cnt
], rsv
);
1501 spin_unlock(&dq_data_lock
);
1503 /* Drop unused references */
1509 int dquot_initialize(struct inode
*inode
)
1511 return __dquot_initialize(inode
, -1);
1513 EXPORT_SYMBOL(dquot_initialize
);
1515 bool dquot_initialize_needed(struct inode
*inode
)
1517 struct dquot
**dquots
;
1520 if (!dquot_active(inode
))
1523 dquots
= i_dquot(inode
);
1524 for (i
= 0; i
< MAXQUOTAS
; i
++)
1525 if (!dquots
[i
] && sb_has_quota_active(inode
->i_sb
, i
))
1529 EXPORT_SYMBOL(dquot_initialize_needed
);
1532 * Release all quotas referenced by inode.
1534 * This function only be called on inode free or converting
1535 * a file to quota file, no other users for the i_dquot in
1536 * both cases, so we needn't call synchronize_srcu() after
1539 static void __dquot_drop(struct inode
*inode
)
1542 struct dquot
**dquots
= i_dquot(inode
);
1543 struct dquot
*put
[MAXQUOTAS
];
1545 spin_lock(&dq_data_lock
);
1546 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1547 put
[cnt
] = dquots
[cnt
];
1550 spin_unlock(&dq_data_lock
);
1554 void dquot_drop(struct inode
*inode
)
1556 struct dquot
* const *dquots
;
1559 if (IS_NOQUOTA(inode
))
1563 * Test before calling to rule out calls from proc and such
1564 * where we are not allowed to block. Note that this is
1565 * actually reliable test even without the lock - the caller
1566 * must assure that nobody can come after the DQUOT_DROP and
1567 * add quota pointers back anyway.
1569 dquots
= i_dquot(inode
);
1570 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1575 if (cnt
< MAXQUOTAS
)
1576 __dquot_drop(inode
);
1578 EXPORT_SYMBOL(dquot_drop
);
1581 * inode_reserved_space is managed internally by quota, and protected by
1582 * i_lock similar to i_blocks+i_bytes.
1584 static qsize_t
*inode_reserved_space(struct inode
* inode
)
1586 /* Filesystem must explicitly define it's own method in order to use
1587 * quota reservation interface */
1588 BUG_ON(!inode
->i_sb
->dq_op
->get_reserved_space
);
1589 return inode
->i_sb
->dq_op
->get_reserved_space(inode
);
1592 void inode_add_rsv_space(struct inode
*inode
, qsize_t number
)
1594 spin_lock(&inode
->i_lock
);
1595 *inode_reserved_space(inode
) += number
;
1596 spin_unlock(&inode
->i_lock
);
1598 EXPORT_SYMBOL(inode_add_rsv_space
);
1600 void inode_claim_rsv_space(struct inode
*inode
, qsize_t number
)
1602 spin_lock(&inode
->i_lock
);
1603 *inode_reserved_space(inode
) -= number
;
1604 __inode_add_bytes(inode
, number
);
1605 spin_unlock(&inode
->i_lock
);
1607 EXPORT_SYMBOL(inode_claim_rsv_space
);
1609 void inode_reclaim_rsv_space(struct inode
*inode
, qsize_t number
)
1611 spin_lock(&inode
->i_lock
);
1612 *inode_reserved_space(inode
) += number
;
1613 __inode_sub_bytes(inode
, number
);
1614 spin_unlock(&inode
->i_lock
);
1616 EXPORT_SYMBOL(inode_reclaim_rsv_space
);
1618 void inode_sub_rsv_space(struct inode
*inode
, qsize_t number
)
1620 spin_lock(&inode
->i_lock
);
1621 *inode_reserved_space(inode
) -= number
;
1622 spin_unlock(&inode
->i_lock
);
1624 EXPORT_SYMBOL(inode_sub_rsv_space
);
1626 static qsize_t
inode_get_rsv_space(struct inode
*inode
)
1630 if (!inode
->i_sb
->dq_op
->get_reserved_space
)
1632 spin_lock(&inode
->i_lock
);
1633 ret
= *inode_reserved_space(inode
);
1634 spin_unlock(&inode
->i_lock
);
1638 static void inode_incr_space(struct inode
*inode
, qsize_t number
,
1642 inode_add_rsv_space(inode
, number
);
1644 inode_add_bytes(inode
, number
);
1647 static void inode_decr_space(struct inode
*inode
, qsize_t number
, int reserve
)
1650 inode_sub_rsv_space(inode
, number
);
1652 inode_sub_bytes(inode
, number
);
1656 * This functions updates i_blocks+i_bytes fields and quota information
1657 * (together with appropriate checks).
1659 * NOTE: We absolutely rely on the fact that caller dirties the inode
1660 * (usually helpers in quotaops.h care about this) and holds a handle for
1661 * the current transaction so that dquot write and inode write go into the
1666 * This operation can block, but only after everything is updated
1668 int __dquot_alloc_space(struct inode
*inode
, qsize_t number
, int flags
)
1670 int cnt
, ret
= 0, index
;
1671 struct dquot_warn warn
[MAXQUOTAS
];
1672 int reserve
= flags
& DQUOT_SPACE_RESERVE
;
1673 struct dquot
**dquots
;
1675 if (!dquot_active(inode
)) {
1676 inode_incr_space(inode
, number
, reserve
);
1680 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1681 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1683 dquots
= i_dquot(inode
);
1684 index
= srcu_read_lock(&dquot_srcu
);
1685 spin_lock(&dq_data_lock
);
1686 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1689 ret
= check_bdq(dquots
[cnt
], number
,
1690 !(flags
& DQUOT_SPACE_WARN
), &warn
[cnt
]);
1691 if (ret
&& !(flags
& DQUOT_SPACE_NOFAIL
)) {
1692 spin_unlock(&dq_data_lock
);
1693 goto out_flush_warn
;
1696 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1700 dquot_resv_space(dquots
[cnt
], number
);
1702 dquot_incr_space(dquots
[cnt
], number
);
1704 inode_incr_space(inode
, number
, reserve
);
1705 spin_unlock(&dq_data_lock
);
1708 goto out_flush_warn
;
1709 mark_all_dquot_dirty(dquots
);
1711 srcu_read_unlock(&dquot_srcu
, index
);
1712 flush_warnings(warn
);
1716 EXPORT_SYMBOL(__dquot_alloc_space
);
1719 * This operation can block, but only after everything is updated
1721 int dquot_alloc_inode(struct inode
*inode
)
1723 int cnt
, ret
= 0, index
;
1724 struct dquot_warn warn
[MAXQUOTAS
];
1725 struct dquot
* const *dquots
;
1727 if (!dquot_active(inode
))
1729 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1730 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1732 dquots
= i_dquot(inode
);
1733 index
= srcu_read_lock(&dquot_srcu
);
1734 spin_lock(&dq_data_lock
);
1735 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1738 ret
= check_idq(dquots
[cnt
], 1, &warn
[cnt
]);
1743 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1746 dquot_incr_inodes(dquots
[cnt
], 1);
1750 spin_unlock(&dq_data_lock
);
1752 mark_all_dquot_dirty(dquots
);
1753 srcu_read_unlock(&dquot_srcu
, index
);
1754 flush_warnings(warn
);
1757 EXPORT_SYMBOL(dquot_alloc_inode
);
1760 * Convert in-memory reserved quotas to real consumed quotas
1762 int dquot_claim_space_nodirty(struct inode
*inode
, qsize_t number
)
1764 struct dquot
**dquots
;
1767 if (!dquot_active(inode
)) {
1768 inode_claim_rsv_space(inode
, number
);
1772 dquots
= i_dquot(inode
);
1773 index
= srcu_read_lock(&dquot_srcu
);
1774 spin_lock(&dq_data_lock
);
1775 /* Claim reserved quotas to allocated quotas */
1776 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1778 dquot_claim_reserved_space(dquots
[cnt
], number
);
1780 /* Update inode bytes */
1781 inode_claim_rsv_space(inode
, number
);
1782 spin_unlock(&dq_data_lock
);
1783 mark_all_dquot_dirty(dquots
);
1784 srcu_read_unlock(&dquot_srcu
, index
);
1787 EXPORT_SYMBOL(dquot_claim_space_nodirty
);
1790 * Convert allocated space back to in-memory reserved quotas
1792 void dquot_reclaim_space_nodirty(struct inode
*inode
, qsize_t number
)
1794 struct dquot
**dquots
;
1797 if (!dquot_active(inode
)) {
1798 inode_reclaim_rsv_space(inode
, number
);
1802 dquots
= i_dquot(inode
);
1803 index
= srcu_read_lock(&dquot_srcu
);
1804 spin_lock(&dq_data_lock
);
1805 /* Claim reserved quotas to allocated quotas */
1806 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1808 dquot_reclaim_reserved_space(dquots
[cnt
], number
);
1810 /* Update inode bytes */
1811 inode_reclaim_rsv_space(inode
, number
);
1812 spin_unlock(&dq_data_lock
);
1813 mark_all_dquot_dirty(dquots
);
1814 srcu_read_unlock(&dquot_srcu
, index
);
1817 EXPORT_SYMBOL(dquot_reclaim_space_nodirty
);
1820 * This operation can block, but only after everything is updated
1822 void __dquot_free_space(struct inode
*inode
, qsize_t number
, int flags
)
1825 struct dquot_warn warn
[MAXQUOTAS
];
1826 struct dquot
**dquots
;
1827 int reserve
= flags
& DQUOT_SPACE_RESERVE
, index
;
1829 if (!dquot_active(inode
)) {
1830 inode_decr_space(inode
, number
, reserve
);
1834 dquots
= i_dquot(inode
);
1835 index
= srcu_read_lock(&dquot_srcu
);
1836 spin_lock(&dq_data_lock
);
1837 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1840 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1843 wtype
= info_bdq_free(dquots
[cnt
], number
);
1844 if (wtype
!= QUOTA_NL_NOWARN
)
1845 prepare_warning(&warn
[cnt
], dquots
[cnt
], wtype
);
1847 dquot_free_reserved_space(dquots
[cnt
], number
);
1849 dquot_decr_space(dquots
[cnt
], number
);
1851 inode_decr_space(inode
, number
, reserve
);
1852 spin_unlock(&dq_data_lock
);
1856 mark_all_dquot_dirty(dquots
);
1858 srcu_read_unlock(&dquot_srcu
, index
);
1859 flush_warnings(warn
);
1861 EXPORT_SYMBOL(__dquot_free_space
);
1864 * This operation can block, but only after everything is updated
1866 void dquot_free_inode(struct inode
*inode
)
1869 struct dquot_warn warn
[MAXQUOTAS
];
1870 struct dquot
* const *dquots
;
1873 if (!dquot_active(inode
))
1876 dquots
= i_dquot(inode
);
1877 index
= srcu_read_lock(&dquot_srcu
);
1878 spin_lock(&dq_data_lock
);
1879 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1882 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1885 wtype
= info_idq_free(dquots
[cnt
], 1);
1886 if (wtype
!= QUOTA_NL_NOWARN
)
1887 prepare_warning(&warn
[cnt
], dquots
[cnt
], wtype
);
1888 dquot_decr_inodes(dquots
[cnt
], 1);
1890 spin_unlock(&dq_data_lock
);
1891 mark_all_dquot_dirty(dquots
);
1892 srcu_read_unlock(&dquot_srcu
, index
);
1893 flush_warnings(warn
);
1895 EXPORT_SYMBOL(dquot_free_inode
);
1898 * Transfer the number of inode and blocks from one diskquota to an other.
1899 * On success, dquot references in transfer_to are consumed and references
1900 * to original dquots that need to be released are placed there. On failure,
1901 * references are kept untouched.
1903 * This operation can block, but only after everything is updated
1904 * A transaction must be started when entering this function.
1906 * We are holding reference on transfer_from & transfer_to, no need to
1907 * protect them by srcu_read_lock().
1909 int __dquot_transfer(struct inode
*inode
, struct dquot
**transfer_to
)
1911 qsize_t space
, cur_space
;
1912 qsize_t rsv_space
= 0;
1913 qsize_t inode_usage
= 1;
1914 struct dquot
*transfer_from
[MAXQUOTAS
] = {};
1916 char is_valid
[MAXQUOTAS
] = {};
1917 struct dquot_warn warn_to
[MAXQUOTAS
];
1918 struct dquot_warn warn_from_inodes
[MAXQUOTAS
];
1919 struct dquot_warn warn_from_space
[MAXQUOTAS
];
1921 if (IS_NOQUOTA(inode
))
1924 if (inode
->i_sb
->dq_op
->get_inode_usage
) {
1925 ret
= inode
->i_sb
->dq_op
->get_inode_usage(inode
, &inode_usage
);
1930 /* Initialize the arrays */
1931 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1932 warn_to
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1933 warn_from_inodes
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1934 warn_from_space
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1937 spin_lock(&dq_data_lock
);
1938 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1939 spin_unlock(&dq_data_lock
);
1942 cur_space
= inode_get_bytes(inode
);
1943 rsv_space
= inode_get_rsv_space(inode
);
1944 space
= cur_space
+ rsv_space
;
1945 /* Build the transfer_from list and check the limits */
1946 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1948 * Skip changes for same uid or gid or for turned off quota-type.
1950 if (!transfer_to
[cnt
])
1952 /* Avoid races with quotaoff() */
1953 if (!sb_has_quota_active(inode
->i_sb
, cnt
))
1956 transfer_from
[cnt
] = i_dquot(inode
)[cnt
];
1957 ret
= check_idq(transfer_to
[cnt
], inode_usage
, &warn_to
[cnt
]);
1960 ret
= check_bdq(transfer_to
[cnt
], space
, 0, &warn_to
[cnt
]);
1966 * Finally perform the needed transfer from transfer_from to transfer_to
1968 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1971 /* Due to IO error we might not have transfer_from[] structure */
1972 if (transfer_from
[cnt
]) {
1974 wtype
= info_idq_free(transfer_from
[cnt
], inode_usage
);
1975 if (wtype
!= QUOTA_NL_NOWARN
)
1976 prepare_warning(&warn_from_inodes
[cnt
],
1977 transfer_from
[cnt
], wtype
);
1978 wtype
= info_bdq_free(transfer_from
[cnt
], space
);
1979 if (wtype
!= QUOTA_NL_NOWARN
)
1980 prepare_warning(&warn_from_space
[cnt
],
1981 transfer_from
[cnt
], wtype
);
1982 dquot_decr_inodes(transfer_from
[cnt
], inode_usage
);
1983 dquot_decr_space(transfer_from
[cnt
], cur_space
);
1984 dquot_free_reserved_space(transfer_from
[cnt
],
1988 dquot_incr_inodes(transfer_to
[cnt
], inode_usage
);
1989 dquot_incr_space(transfer_to
[cnt
], cur_space
);
1990 dquot_resv_space(transfer_to
[cnt
], rsv_space
);
1992 i_dquot(inode
)[cnt
] = transfer_to
[cnt
];
1994 spin_unlock(&dq_data_lock
);
1996 mark_all_dquot_dirty(transfer_from
);
1997 mark_all_dquot_dirty(transfer_to
);
1998 flush_warnings(warn_to
);
1999 flush_warnings(warn_from_inodes
);
2000 flush_warnings(warn_from_space
);
2001 /* Pass back references to put */
2002 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2004 transfer_to
[cnt
] = transfer_from
[cnt
];
2007 spin_unlock(&dq_data_lock
);
2008 flush_warnings(warn_to
);
2011 EXPORT_SYMBOL(__dquot_transfer
);
2013 /* Wrapper for transferring ownership of an inode for uid/gid only
2014 * Called from FSXXX_setattr()
2016 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
2018 struct dquot
*transfer_to
[MAXQUOTAS
] = {};
2019 struct dquot
*dquot
;
2020 struct super_block
*sb
= inode
->i_sb
;
2023 if (!dquot_active(inode
))
2026 if (iattr
->ia_valid
& ATTR_UID
&& !uid_eq(iattr
->ia_uid
, inode
->i_uid
)){
2027 dquot
= dqget(sb
, make_kqid_uid(iattr
->ia_uid
));
2028 if (IS_ERR(dquot
)) {
2029 if (PTR_ERR(dquot
) != -ESRCH
) {
2030 ret
= PTR_ERR(dquot
);
2035 transfer_to
[USRQUOTA
] = dquot
;
2037 if (iattr
->ia_valid
& ATTR_GID
&& !gid_eq(iattr
->ia_gid
, inode
->i_gid
)){
2038 dquot
= dqget(sb
, make_kqid_gid(iattr
->ia_gid
));
2039 if (IS_ERR(dquot
)) {
2040 if (PTR_ERR(dquot
) != -ESRCH
) {
2041 ret
= PTR_ERR(dquot
);
2046 transfer_to
[GRPQUOTA
] = dquot
;
2048 ret
= __dquot_transfer(inode
, transfer_to
);
2050 dqput_all(transfer_to
);
2053 EXPORT_SYMBOL(dquot_transfer
);
2056 * Write info of quota file to disk
2058 int dquot_commit_info(struct super_block
*sb
, int type
)
2061 struct quota_info
*dqopt
= sb_dqopt(sb
);
2063 mutex_lock(&dqopt
->dqio_mutex
);
2064 ret
= dqopt
->ops
[type
]->write_file_info(sb
, type
);
2065 mutex_unlock(&dqopt
->dqio_mutex
);
2068 EXPORT_SYMBOL(dquot_commit_info
);
2070 int dquot_get_next_id(struct super_block
*sb
, struct kqid
*qid
)
2072 struct quota_info
*dqopt
= sb_dqopt(sb
);
2075 if (!sb_has_quota_active(sb
, qid
->type
))
2077 if (!dqopt
->ops
[qid
->type
]->get_next_id
)
2079 mutex_lock(&dqopt
->dqio_mutex
);
2080 err
= dqopt
->ops
[qid
->type
]->get_next_id(sb
, qid
);
2081 mutex_unlock(&dqopt
->dqio_mutex
);
2084 EXPORT_SYMBOL(dquot_get_next_id
);
2087 * Definitions of diskquota operations.
2089 const struct dquot_operations dquot_operations
= {
2090 .write_dquot
= dquot_commit
,
2091 .acquire_dquot
= dquot_acquire
,
2092 .release_dquot
= dquot_release
,
2093 .mark_dirty
= dquot_mark_dquot_dirty
,
2094 .write_info
= dquot_commit_info
,
2095 .alloc_dquot
= dquot_alloc
,
2096 .destroy_dquot
= dquot_destroy
,
2097 .get_next_id
= dquot_get_next_id
,
2099 EXPORT_SYMBOL(dquot_operations
);
2102 * Generic helper for ->open on filesystems supporting disk quotas.
2104 int dquot_file_open(struct inode
*inode
, struct file
*file
)
2108 error
= generic_file_open(inode
, file
);
2109 if (!error
&& (file
->f_mode
& FMODE_WRITE
))
2110 dquot_initialize(inode
);
2113 EXPORT_SYMBOL(dquot_file_open
);
2116 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
2118 int dquot_disable(struct super_block
*sb
, int type
, unsigned int flags
)
2121 struct quota_info
*dqopt
= sb_dqopt(sb
);
2122 struct inode
*toputinode
[MAXQUOTAS
];
2124 /* s_umount should be held in exclusive mode */
2125 if (WARN_ON_ONCE(down_read_trylock(&sb
->s_umount
)))
2126 up_read(&sb
->s_umount
);
2128 /* Cannot turn off usage accounting without turning off limits, or
2129 * suspend quotas and simultaneously turn quotas off. */
2130 if ((flags
& DQUOT_USAGE_ENABLED
&& !(flags
& DQUOT_LIMITS_ENABLED
))
2131 || (flags
& DQUOT_SUSPENDED
&& flags
& (DQUOT_LIMITS_ENABLED
|
2132 DQUOT_USAGE_ENABLED
)))
2136 * Skip everything if there's nothing to do. We have to do this because
2137 * sometimes we are called when fill_super() failed and calling
2138 * sync_fs() in such cases does no good.
2140 if (!sb_any_quota_loaded(sb
))
2143 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2144 toputinode
[cnt
] = NULL
;
2145 if (type
!= -1 && cnt
!= type
)
2147 if (!sb_has_quota_loaded(sb
, cnt
))
2150 if (flags
& DQUOT_SUSPENDED
) {
2151 spin_lock(&dq_state_lock
);
2153 dquot_state_flag(DQUOT_SUSPENDED
, cnt
);
2154 spin_unlock(&dq_state_lock
);
2156 spin_lock(&dq_state_lock
);
2157 dqopt
->flags
&= ~dquot_state_flag(flags
, cnt
);
2158 /* Turning off suspended quotas? */
2159 if (!sb_has_quota_loaded(sb
, cnt
) &&
2160 sb_has_quota_suspended(sb
, cnt
)) {
2161 dqopt
->flags
&= ~dquot_state_flag(
2162 DQUOT_SUSPENDED
, cnt
);
2163 spin_unlock(&dq_state_lock
);
2164 iput(dqopt
->files
[cnt
]);
2165 dqopt
->files
[cnt
] = NULL
;
2168 spin_unlock(&dq_state_lock
);
2171 /* We still have to keep quota loaded? */
2172 if (sb_has_quota_loaded(sb
, cnt
) && !(flags
& DQUOT_SUSPENDED
))
2175 /* Note: these are blocking operations */
2176 drop_dquot_ref(sb
, cnt
);
2177 invalidate_dquots(sb
, cnt
);
2179 * Now all dquots should be invalidated, all writes done so we
2180 * should be only users of the info. No locks needed.
2182 if (info_dirty(&dqopt
->info
[cnt
]))
2183 sb
->dq_op
->write_info(sb
, cnt
);
2184 if (dqopt
->ops
[cnt
]->free_file_info
)
2185 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
2186 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
2188 toputinode
[cnt
] = dqopt
->files
[cnt
];
2189 if (!sb_has_quota_loaded(sb
, cnt
))
2190 dqopt
->files
[cnt
] = NULL
;
2191 dqopt
->info
[cnt
].dqi_flags
= 0;
2192 dqopt
->info
[cnt
].dqi_igrace
= 0;
2193 dqopt
->info
[cnt
].dqi_bgrace
= 0;
2194 dqopt
->ops
[cnt
] = NULL
;
2197 /* Skip syncing and setting flags if quota files are hidden */
2198 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
2201 /* Sync the superblock so that buffers with quota data are written to
2202 * disk (and so userspace sees correct data afterwards). */
2203 if (sb
->s_op
->sync_fs
)
2204 sb
->s_op
->sync_fs(sb
, 1);
2205 sync_blockdev(sb
->s_bdev
);
2206 /* Now the quota files are just ordinary files and we can set the
2207 * inode flags back. Moreover we discard the pagecache so that
2208 * userspace sees the writes we did bypassing the pagecache. We
2209 * must also discard the blockdev buffers so that we see the
2210 * changes done by userspace on the next quotaon() */
2211 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2212 /* This can happen when suspending quotas on remount-ro... */
2213 if (toputinode
[cnt
] && !sb_has_quota_loaded(sb
, cnt
)) {
2214 inode_lock(toputinode
[cnt
]);
2215 toputinode
[cnt
]->i_flags
&= ~S_NOQUOTA
;
2216 truncate_inode_pages(&toputinode
[cnt
]->i_data
, 0);
2217 inode_unlock(toputinode
[cnt
]);
2218 mark_inode_dirty_sync(toputinode
[cnt
]);
2221 invalidate_bdev(sb
->s_bdev
);
2223 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2224 if (toputinode
[cnt
]) {
2225 /* On remount RO, we keep the inode pointer so that we
2226 * can reenable quota on the subsequent remount RW. We
2227 * have to check 'flags' variable and not use sb_has_
2228 * function because another quotaon / quotaoff could
2229 * change global state before we got here. We refuse
2230 * to suspend quotas when there is pending delete on
2231 * the quota file... */
2232 if (!(flags
& DQUOT_SUSPENDED
))
2233 iput(toputinode
[cnt
]);
2234 else if (!toputinode
[cnt
]->i_nlink
)
2239 EXPORT_SYMBOL(dquot_disable
);
2241 int dquot_quota_off(struct super_block
*sb
, int type
)
2243 return dquot_disable(sb
, type
,
2244 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2246 EXPORT_SYMBOL(dquot_quota_off
);
2249 * Turn quotas on on a device
2253 * Helper function to turn quotas on when we already have the inode of
2254 * quota file and no quota information is loaded.
2256 static int vfs_load_quota_inode(struct inode
*inode
, int type
, int format_id
,
2259 struct quota_format_type
*fmt
= find_quota_format(format_id
);
2260 struct super_block
*sb
= inode
->i_sb
;
2261 struct quota_info
*dqopt
= sb_dqopt(sb
);
2266 if (!S_ISREG(inode
->i_mode
)) {
2270 if (IS_RDONLY(inode
)) {
2274 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
||
2275 (type
== PRJQUOTA
&& sb
->dq_op
->get_projid
== NULL
)) {
2279 /* Filesystems outside of init_user_ns not yet supported */
2280 if (sb
->s_user_ns
!= &init_user_ns
) {
2284 /* Usage always has to be set... */
2285 if (!(flags
& DQUOT_USAGE_ENABLED
)) {
2289 if (sb_has_quota_loaded(sb
, type
)) {
2294 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2295 /* As we bypass the pagecache we must now flush all the
2296 * dirty data and invalidate caches so that kernel sees
2297 * changes from userspace. It is not enough to just flush
2298 * the quota file since if blocksize < pagesize, invalidation
2299 * of the cache could fail because of other unrelated dirty
2301 sync_filesystem(sb
);
2302 invalidate_bdev(sb
->s_bdev
);
2305 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2306 /* We don't want quota and atime on quota files (deadlocks
2307 * possible) Also nobody should write to the file - we use
2308 * special IO operations which ignore the immutable bit. */
2310 inode
->i_flags
|= S_NOQUOTA
;
2311 inode_unlock(inode
);
2313 * When S_NOQUOTA is set, remove dquot references as no more
2314 * references can be added
2316 __dquot_drop(inode
);
2320 dqopt
->files
[type
] = igrab(inode
);
2321 if (!dqopt
->files
[type
])
2322 goto out_file_flags
;
2324 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
2327 dqopt
->ops
[type
] = fmt
->qf_ops
;
2328 dqopt
->info
[type
].dqi_format
= fmt
;
2329 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
2330 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
2331 mutex_lock(&dqopt
->dqio_mutex
);
2332 error
= dqopt
->ops
[type
]->read_file_info(sb
, type
);
2334 mutex_unlock(&dqopt
->dqio_mutex
);
2337 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
2338 dqopt
->info
[type
].dqi_flags
|= DQF_SYS_FILE
;
2339 mutex_unlock(&dqopt
->dqio_mutex
);
2340 spin_lock(&dq_state_lock
);
2341 dqopt
->flags
|= dquot_state_flag(flags
, type
);
2342 spin_unlock(&dq_state_lock
);
2344 add_dquot_ref(sb
, type
);
2349 dqopt
->files
[type
] = NULL
;
2353 inode
->i_flags
&= ~S_NOQUOTA
;
2354 inode_unlock(inode
);
2356 put_quota_format(fmt
);
2361 /* Reenable quotas on remount RW */
2362 int dquot_resume(struct super_block
*sb
, int type
)
2364 struct quota_info
*dqopt
= sb_dqopt(sb
);
2365 struct inode
*inode
;
2369 /* s_umount should be held in exclusive mode */
2370 if (WARN_ON_ONCE(down_read_trylock(&sb
->s_umount
)))
2371 up_read(&sb
->s_umount
);
2373 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2374 if (type
!= -1 && cnt
!= type
)
2376 if (!sb_has_quota_suspended(sb
, cnt
))
2379 inode
= dqopt
->files
[cnt
];
2380 dqopt
->files
[cnt
] = NULL
;
2381 spin_lock(&dq_state_lock
);
2382 flags
= dqopt
->flags
& dquot_state_flag(DQUOT_USAGE_ENABLED
|
2383 DQUOT_LIMITS_ENABLED
,
2385 dqopt
->flags
&= ~dquot_state_flag(DQUOT_STATE_FLAGS
, cnt
);
2386 spin_unlock(&dq_state_lock
);
2388 flags
= dquot_generic_flag(flags
, cnt
);
2389 ret
= vfs_load_quota_inode(inode
, cnt
,
2390 dqopt
->info
[cnt
].dqi_fmt_id
, flags
);
2396 EXPORT_SYMBOL(dquot_resume
);
2398 int dquot_quota_on(struct super_block
*sb
, int type
, int format_id
,
2399 const struct path
*path
)
2401 int error
= security_quota_on(path
->dentry
);
2404 /* Quota file not on the same filesystem? */
2405 if (path
->dentry
->d_sb
!= sb
)
2408 error
= vfs_load_quota_inode(d_inode(path
->dentry
), type
,
2409 format_id
, DQUOT_USAGE_ENABLED
|
2410 DQUOT_LIMITS_ENABLED
);
2413 EXPORT_SYMBOL(dquot_quota_on
);
2416 * More powerful function for turning on quotas allowing setting
2417 * of individual quota flags
2419 int dquot_enable(struct inode
*inode
, int type
, int format_id
,
2422 struct super_block
*sb
= inode
->i_sb
;
2424 /* Just unsuspend quotas? */
2425 BUG_ON(flags
& DQUOT_SUSPENDED
);
2426 /* s_umount should be held in exclusive mode */
2427 if (WARN_ON_ONCE(down_read_trylock(&sb
->s_umount
)))
2428 up_read(&sb
->s_umount
);
2432 /* Just updating flags needed? */
2433 if (sb_has_quota_loaded(sb
, type
)) {
2434 if (flags
& DQUOT_USAGE_ENABLED
&&
2435 sb_has_quota_usage_enabled(sb
, type
))
2437 if (flags
& DQUOT_LIMITS_ENABLED
&&
2438 sb_has_quota_limits_enabled(sb
, type
))
2440 spin_lock(&dq_state_lock
);
2441 sb_dqopt(sb
)->flags
|= dquot_state_flag(flags
, type
);
2442 spin_unlock(&dq_state_lock
);
2446 return vfs_load_quota_inode(inode
, type
, format_id
, flags
);
2448 EXPORT_SYMBOL(dquot_enable
);
2451 * This function is used when filesystem needs to initialize quotas
2452 * during mount time.
2454 int dquot_quota_on_mount(struct super_block
*sb
, char *qf_name
,
2455 int format_id
, int type
)
2457 struct dentry
*dentry
;
2460 dentry
= lookup_one_len_unlocked(qf_name
, sb
->s_root
, strlen(qf_name
));
2462 return PTR_ERR(dentry
);
2464 if (d_really_is_negative(dentry
)) {
2469 error
= security_quota_on(dentry
);
2471 error
= vfs_load_quota_inode(d_inode(dentry
), type
, format_id
,
2472 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2478 EXPORT_SYMBOL(dquot_quota_on_mount
);
2480 static int dquot_quota_enable(struct super_block
*sb
, unsigned int flags
)
2484 struct quota_info
*dqopt
= sb_dqopt(sb
);
2486 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
))
2488 /* Accounting cannot be turned on while fs is mounted */
2489 flags
&= ~(FS_QUOTA_UDQ_ACCT
| FS_QUOTA_GDQ_ACCT
| FS_QUOTA_PDQ_ACCT
);
2492 for (type
= 0; type
< MAXQUOTAS
; type
++) {
2493 if (!(flags
& qtype_enforce_flag(type
)))
2495 /* Can't enforce without accounting */
2496 if (!sb_has_quota_usage_enabled(sb
, type
))
2498 ret
= dquot_enable(dqopt
->files
[type
], type
,
2499 dqopt
->info
[type
].dqi_fmt_id
,
2500 DQUOT_LIMITS_ENABLED
);
2506 /* Backout enforcement enablement we already did */
2507 for (type
--; type
>= 0; type
--) {
2508 if (flags
& qtype_enforce_flag(type
))
2509 dquot_disable(sb
, type
, DQUOT_LIMITS_ENABLED
);
2511 /* Error code translation for better compatibility with XFS */
2517 static int dquot_quota_disable(struct super_block
*sb
, unsigned int flags
)
2521 struct quota_info
*dqopt
= sb_dqopt(sb
);
2523 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
))
2526 * We don't support turning off accounting via quotactl. In principle
2527 * quota infrastructure can do this but filesystems don't expect
2528 * userspace to be able to do it.
2531 (FS_QUOTA_UDQ_ACCT
| FS_QUOTA_GDQ_ACCT
| FS_QUOTA_PDQ_ACCT
))
2534 /* Filter out limits not enabled */
2535 for (type
= 0; type
< MAXQUOTAS
; type
++)
2536 if (!sb_has_quota_limits_enabled(sb
, type
))
2537 flags
&= ~qtype_enforce_flag(type
);
2541 for (type
= 0; type
< MAXQUOTAS
; type
++) {
2542 if (flags
& qtype_enforce_flag(type
)) {
2543 ret
= dquot_disable(sb
, type
, DQUOT_LIMITS_ENABLED
);
2550 /* Backout enforcement disabling we already did */
2551 for (type
--; type
>= 0; type
--) {
2552 if (flags
& qtype_enforce_flag(type
))
2553 dquot_enable(dqopt
->files
[type
], type
,
2554 dqopt
->info
[type
].dqi_fmt_id
,
2555 DQUOT_LIMITS_ENABLED
);
2560 /* Generic routine for getting common part of quota structure */
2561 static void do_get_dqblk(struct dquot
*dquot
, struct qc_dqblk
*di
)
2563 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2565 memset(di
, 0, sizeof(*di
));
2566 spin_lock(&dq_data_lock
);
2567 di
->d_spc_hardlimit
= dm
->dqb_bhardlimit
;
2568 di
->d_spc_softlimit
= dm
->dqb_bsoftlimit
;
2569 di
->d_ino_hardlimit
= dm
->dqb_ihardlimit
;
2570 di
->d_ino_softlimit
= dm
->dqb_isoftlimit
;
2571 di
->d_space
= dm
->dqb_curspace
+ dm
->dqb_rsvspace
;
2572 di
->d_ino_count
= dm
->dqb_curinodes
;
2573 di
->d_spc_timer
= dm
->dqb_btime
;
2574 di
->d_ino_timer
= dm
->dqb_itime
;
2575 spin_unlock(&dq_data_lock
);
2578 int dquot_get_dqblk(struct super_block
*sb
, struct kqid qid
,
2579 struct qc_dqblk
*di
)
2581 struct dquot
*dquot
;
2583 dquot
= dqget(sb
, qid
);
2585 return PTR_ERR(dquot
);
2586 do_get_dqblk(dquot
, di
);
2591 EXPORT_SYMBOL(dquot_get_dqblk
);
2593 int dquot_get_next_dqblk(struct super_block
*sb
, struct kqid
*qid
,
2594 struct qc_dqblk
*di
)
2596 struct dquot
*dquot
;
2599 if (!sb
->dq_op
->get_next_id
)
2601 err
= sb
->dq_op
->get_next_id(sb
, qid
);
2604 dquot
= dqget(sb
, *qid
);
2606 return PTR_ERR(dquot
);
2607 do_get_dqblk(dquot
, di
);
2612 EXPORT_SYMBOL(dquot_get_next_dqblk
);
2614 #define VFS_QC_MASK \
2615 (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \
2616 QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \
2617 QC_SPC_TIMER | QC_INO_TIMER)
2619 /* Generic routine for setting common part of quota structure */
2620 static int do_set_dqblk(struct dquot
*dquot
, struct qc_dqblk
*di
)
2622 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2623 int check_blim
= 0, check_ilim
= 0;
2624 struct mem_dqinfo
*dqi
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
];
2626 if (di
->d_fieldmask
& ~VFS_QC_MASK
)
2629 if (((di
->d_fieldmask
& QC_SPC_SOFT
) &&
2630 di
->d_spc_softlimit
> dqi
->dqi_max_spc_limit
) ||
2631 ((di
->d_fieldmask
& QC_SPC_HARD
) &&
2632 di
->d_spc_hardlimit
> dqi
->dqi_max_spc_limit
) ||
2633 ((di
->d_fieldmask
& QC_INO_SOFT
) &&
2634 (di
->d_ino_softlimit
> dqi
->dqi_max_ino_limit
)) ||
2635 ((di
->d_fieldmask
& QC_INO_HARD
) &&
2636 (di
->d_ino_hardlimit
> dqi
->dqi_max_ino_limit
)))
2639 spin_lock(&dq_data_lock
);
2640 if (di
->d_fieldmask
& QC_SPACE
) {
2641 dm
->dqb_curspace
= di
->d_space
- dm
->dqb_rsvspace
;
2643 set_bit(DQ_LASTSET_B
+ QIF_SPACE_B
, &dquot
->dq_flags
);
2646 if (di
->d_fieldmask
& QC_SPC_SOFT
)
2647 dm
->dqb_bsoftlimit
= di
->d_spc_softlimit
;
2648 if (di
->d_fieldmask
& QC_SPC_HARD
)
2649 dm
->dqb_bhardlimit
= di
->d_spc_hardlimit
;
2650 if (di
->d_fieldmask
& (QC_SPC_SOFT
| QC_SPC_HARD
)) {
2652 set_bit(DQ_LASTSET_B
+ QIF_BLIMITS_B
, &dquot
->dq_flags
);
2655 if (di
->d_fieldmask
& QC_INO_COUNT
) {
2656 dm
->dqb_curinodes
= di
->d_ino_count
;
2658 set_bit(DQ_LASTSET_B
+ QIF_INODES_B
, &dquot
->dq_flags
);
2661 if (di
->d_fieldmask
& QC_INO_SOFT
)
2662 dm
->dqb_isoftlimit
= di
->d_ino_softlimit
;
2663 if (di
->d_fieldmask
& QC_INO_HARD
)
2664 dm
->dqb_ihardlimit
= di
->d_ino_hardlimit
;
2665 if (di
->d_fieldmask
& (QC_INO_SOFT
| QC_INO_HARD
)) {
2667 set_bit(DQ_LASTSET_B
+ QIF_ILIMITS_B
, &dquot
->dq_flags
);
2670 if (di
->d_fieldmask
& QC_SPC_TIMER
) {
2671 dm
->dqb_btime
= di
->d_spc_timer
;
2673 set_bit(DQ_LASTSET_B
+ QIF_BTIME_B
, &dquot
->dq_flags
);
2676 if (di
->d_fieldmask
& QC_INO_TIMER
) {
2677 dm
->dqb_itime
= di
->d_ino_timer
;
2679 set_bit(DQ_LASTSET_B
+ QIF_ITIME_B
, &dquot
->dq_flags
);
2683 if (!dm
->dqb_bsoftlimit
||
2684 dm
->dqb_curspace
< dm
->dqb_bsoftlimit
) {
2686 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
2687 } else if (!(di
->d_fieldmask
& QC_SPC_TIMER
))
2688 /* Set grace only if user hasn't provided his own... */
2689 dm
->dqb_btime
= ktime_get_real_seconds() + dqi
->dqi_bgrace
;
2692 if (!dm
->dqb_isoftlimit
||
2693 dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
2695 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
2696 } else if (!(di
->d_fieldmask
& QC_INO_TIMER
))
2697 /* Set grace only if user hasn't provided his own... */
2698 dm
->dqb_itime
= ktime_get_real_seconds() + dqi
->dqi_igrace
;
2700 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
||
2702 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2704 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2705 spin_unlock(&dq_data_lock
);
2706 mark_dquot_dirty(dquot
);
2711 int dquot_set_dqblk(struct super_block
*sb
, struct kqid qid
,
2712 struct qc_dqblk
*di
)
2714 struct dquot
*dquot
;
2717 dquot
= dqget(sb
, qid
);
2718 if (IS_ERR(dquot
)) {
2719 rc
= PTR_ERR(dquot
);
2722 rc
= do_set_dqblk(dquot
, di
);
2727 EXPORT_SYMBOL(dquot_set_dqblk
);
2729 /* Generic routine for getting common part of quota file information */
2730 int dquot_get_state(struct super_block
*sb
, struct qc_state
*state
)
2732 struct mem_dqinfo
*mi
;
2733 struct qc_type_state
*tstate
;
2734 struct quota_info
*dqopt
= sb_dqopt(sb
);
2737 memset(state
, 0, sizeof(*state
));
2738 for (type
= 0; type
< MAXQUOTAS
; type
++) {
2739 if (!sb_has_quota_active(sb
, type
))
2741 tstate
= state
->s_state
+ type
;
2742 mi
= sb_dqopt(sb
)->info
+ type
;
2743 tstate
->flags
= QCI_ACCT_ENABLED
;
2744 spin_lock(&dq_data_lock
);
2745 if (mi
->dqi_flags
& DQF_SYS_FILE
)
2746 tstate
->flags
|= QCI_SYSFILE
;
2747 if (mi
->dqi_flags
& DQF_ROOT_SQUASH
)
2748 tstate
->flags
|= QCI_ROOT_SQUASH
;
2749 if (sb_has_quota_limits_enabled(sb
, type
))
2750 tstate
->flags
|= QCI_LIMITS_ENFORCED
;
2751 tstate
->spc_timelimit
= mi
->dqi_bgrace
;
2752 tstate
->ino_timelimit
= mi
->dqi_igrace
;
2753 tstate
->ino
= dqopt
->files
[type
]->i_ino
;
2754 tstate
->blocks
= dqopt
->files
[type
]->i_blocks
;
2755 tstate
->nextents
= 1; /* We don't know... */
2756 spin_unlock(&dq_data_lock
);
2760 EXPORT_SYMBOL(dquot_get_state
);
2762 /* Generic routine for setting common part of quota file information */
2763 int dquot_set_dqinfo(struct super_block
*sb
, int type
, struct qc_info
*ii
)
2765 struct mem_dqinfo
*mi
;
2768 if ((ii
->i_fieldmask
& QC_WARNS_MASK
) ||
2769 (ii
->i_fieldmask
& QC_RT_SPC_TIMER
))
2771 if (!sb_has_quota_active(sb
, type
))
2773 mi
= sb_dqopt(sb
)->info
+ type
;
2774 if (ii
->i_fieldmask
& QC_FLAGS
) {
2775 if ((ii
->i_flags
& QCI_ROOT_SQUASH
&&
2776 mi
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
))
2779 spin_lock(&dq_data_lock
);
2780 if (ii
->i_fieldmask
& QC_SPC_TIMER
)
2781 mi
->dqi_bgrace
= ii
->i_spc_timelimit
;
2782 if (ii
->i_fieldmask
& QC_INO_TIMER
)
2783 mi
->dqi_igrace
= ii
->i_ino_timelimit
;
2784 if (ii
->i_fieldmask
& QC_FLAGS
) {
2785 if (ii
->i_flags
& QCI_ROOT_SQUASH
)
2786 mi
->dqi_flags
|= DQF_ROOT_SQUASH
;
2788 mi
->dqi_flags
&= ~DQF_ROOT_SQUASH
;
2790 spin_unlock(&dq_data_lock
);
2791 mark_info_dirty(sb
, type
);
2792 /* Force write to disk */
2793 sb
->dq_op
->write_info(sb
, type
);
2796 EXPORT_SYMBOL(dquot_set_dqinfo
);
2798 const struct quotactl_ops dquot_quotactl_sysfile_ops
= {
2799 .quota_enable
= dquot_quota_enable
,
2800 .quota_disable
= dquot_quota_disable
,
2801 .quota_sync
= dquot_quota_sync
,
2802 .get_state
= dquot_get_state
,
2803 .set_info
= dquot_set_dqinfo
,
2804 .get_dqblk
= dquot_get_dqblk
,
2805 .get_nextdqblk
= dquot_get_next_dqblk
,
2806 .set_dqblk
= dquot_set_dqblk
2808 EXPORT_SYMBOL(dquot_quotactl_sysfile_ops
);
2810 static int do_proc_dqstats(struct ctl_table
*table
, int write
,
2811 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2813 unsigned int type
= (int *)table
->data
- dqstats
.stat
;
2815 /* Update global table */
2816 dqstats
.stat
[type
] =
2817 percpu_counter_sum_positive(&dqstats
.counter
[type
]);
2818 return proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
2821 static struct ctl_table fs_dqstats_table
[] = {
2823 .procname
= "lookups",
2824 .data
= &dqstats
.stat
[DQST_LOOKUPS
],
2825 .maxlen
= sizeof(int),
2827 .proc_handler
= do_proc_dqstats
,
2830 .procname
= "drops",
2831 .data
= &dqstats
.stat
[DQST_DROPS
],
2832 .maxlen
= sizeof(int),
2834 .proc_handler
= do_proc_dqstats
,
2837 .procname
= "reads",
2838 .data
= &dqstats
.stat
[DQST_READS
],
2839 .maxlen
= sizeof(int),
2841 .proc_handler
= do_proc_dqstats
,
2844 .procname
= "writes",
2845 .data
= &dqstats
.stat
[DQST_WRITES
],
2846 .maxlen
= sizeof(int),
2848 .proc_handler
= do_proc_dqstats
,
2851 .procname
= "cache_hits",
2852 .data
= &dqstats
.stat
[DQST_CACHE_HITS
],
2853 .maxlen
= sizeof(int),
2855 .proc_handler
= do_proc_dqstats
,
2858 .procname
= "allocated_dquots",
2859 .data
= &dqstats
.stat
[DQST_ALLOC_DQUOTS
],
2860 .maxlen
= sizeof(int),
2862 .proc_handler
= do_proc_dqstats
,
2865 .procname
= "free_dquots",
2866 .data
= &dqstats
.stat
[DQST_FREE_DQUOTS
],
2867 .maxlen
= sizeof(int),
2869 .proc_handler
= do_proc_dqstats
,
2872 .procname
= "syncs",
2873 .data
= &dqstats
.stat
[DQST_SYNCS
],
2874 .maxlen
= sizeof(int),
2876 .proc_handler
= do_proc_dqstats
,
2878 #ifdef CONFIG_PRINT_QUOTA_WARNING
2880 .procname
= "warnings",
2881 .data
= &flag_print_warnings
,
2882 .maxlen
= sizeof(int),
2884 .proc_handler
= proc_dointvec
,
2890 static struct ctl_table fs_table
[] = {
2892 .procname
= "quota",
2894 .child
= fs_dqstats_table
,
2899 static struct ctl_table sys_table
[] = {
2908 static int __init
dquot_init(void)
2911 unsigned long nr_hash
, order
;
2913 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2915 register_sysctl_table(sys_table
);
2917 dquot_cachep
= kmem_cache_create("dquot",
2918 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2919 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2920 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2924 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
2926 panic("Cannot create dquot hash table");
2928 for (i
= 0; i
< _DQST_DQSTAT_LAST
; i
++) {
2929 ret
= percpu_counter_init(&dqstats
.counter
[i
], 0, GFP_KERNEL
);
2931 panic("Cannot create dquot stat counters");
2934 /* Find power-of-two hlist_heads which can fit into allocation */
2935 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2939 } while (nr_hash
>> dq_hash_bits
);
2942 nr_hash
= 1UL << dq_hash_bits
;
2943 dq_hash_mask
= nr_hash
- 1;
2944 for (i
= 0; i
< nr_hash
; i
++)
2945 INIT_HLIST_HEAD(dquot_hash
+ i
);
2947 pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld,"
2948 " %ld bytes)\n", nr_hash
, order
, (PAGE_SIZE
<< order
));
2950 register_shrinker(&dqcache_shrinker
);
2954 fs_initcall(dquot_init
);