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 five quota SMP locks:
86 * * dq_list_lock protects all lists with quotas and quota formats.
87 * * dquot->dq_dqb_lock protects data from dq_dqb
88 * * inode->i_lock protects inode->i_blocks, i_bytes and also guards
89 * consistency of dquot->dq_dqb with inode->i_blocks, i_bytes so that
90 * dquot_transfer() can stabilize amount it transfers
91 * * dq_data_lock protects mem_dqinfo structures and modifications of dquot
92 * pointers in the inode
93 * * dq_state_lock protects modifications of quota state (on quotaon and
94 * quotaoff) and readers who care about latest values take it as well.
96 * The spinlock ordering is hence:
97 * dq_data_lock > dq_list_lock > i_lock > dquot->dq_dqb_lock,
98 * dq_list_lock > dq_state_lock
100 * Note that some things (eg. sb pointer, type, id) doesn't change during
101 * the life of the dquot structure and so needn't to be protected by a lock
103 * Operation accessing dquots via inode pointers are protected by dquot_srcu.
104 * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and
105 * synchronize_srcu(&dquot_srcu) is called after clearing pointers from
106 * inode and before dropping dquot references to avoid use of dquots after
107 * they are freed. dq_data_lock is used to serialize the pointer setting and
108 * clearing operations.
109 * Special care needs to be taken about S_NOQUOTA inode flag (marking that
110 * inode is a quota file). Functions adding pointers from inode to dquots have
111 * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they
112 * have to do all pointer modifications before dropping dq_data_lock. This makes
113 * sure they cannot race with quotaon which first sets S_NOQUOTA flag and
114 * then drops all pointers to dquots from an inode.
116 * Each dquot has its dq_lock mutex. Dquot is locked when it is being read to
117 * memory (or space for it is being allocated) on the first dqget(), when it is
118 * being written out, and when it is being released on the last dqput(). The
119 * allocation and release operations are serialized by the dq_lock and by
120 * checking the use count in dquot_release().
122 * Lock ordering (including related VFS locks) is the following:
123 * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem
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 static DECLARE_WAIT_QUEUE_HEAD(dquot_ref_wq
);
134 void __quota_error(struct super_block
*sb
, const char *func
,
135 const char *fmt
, ...)
137 if (printk_ratelimit()) {
139 struct va_format vaf
;
146 printk(KERN_ERR
"Quota error (device %s): %s: %pV\n",
147 sb
->s_id
, func
, &vaf
);
152 EXPORT_SYMBOL(__quota_error
);
154 #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING)
155 static char *quotatypes
[] = INITQFNAMES
;
157 static struct quota_format_type
*quota_formats
; /* List of registered formats */
158 static struct quota_module_name module_names
[] = INIT_QUOTA_MODULE_NAMES
;
160 /* SLAB cache for dquot structures */
161 static struct kmem_cache
*dquot_cachep
;
163 int register_quota_format(struct quota_format_type
*fmt
)
165 spin_lock(&dq_list_lock
);
166 fmt
->qf_next
= quota_formats
;
168 spin_unlock(&dq_list_lock
);
171 EXPORT_SYMBOL(register_quota_format
);
173 void unregister_quota_format(struct quota_format_type
*fmt
)
175 struct quota_format_type
**actqf
;
177 spin_lock(&dq_list_lock
);
178 for (actqf
= "a_formats
; *actqf
&& *actqf
!= fmt
;
179 actqf
= &(*actqf
)->qf_next
)
182 *actqf
= (*actqf
)->qf_next
;
183 spin_unlock(&dq_list_lock
);
185 EXPORT_SYMBOL(unregister_quota_format
);
187 static struct quota_format_type
*find_quota_format(int id
)
189 struct quota_format_type
*actqf
;
191 spin_lock(&dq_list_lock
);
192 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
193 actqf
= actqf
->qf_next
)
195 if (!actqf
|| !try_module_get(actqf
->qf_owner
)) {
198 spin_unlock(&dq_list_lock
);
200 for (qm
= 0; module_names
[qm
].qm_fmt_id
&&
201 module_names
[qm
].qm_fmt_id
!= id
; qm
++)
203 if (!module_names
[qm
].qm_fmt_id
||
204 request_module(module_names
[qm
].qm_mod_name
))
207 spin_lock(&dq_list_lock
);
208 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
209 actqf
= actqf
->qf_next
)
211 if (actqf
&& !try_module_get(actqf
->qf_owner
))
214 spin_unlock(&dq_list_lock
);
218 static void put_quota_format(struct quota_format_type
*fmt
)
220 module_put(fmt
->qf_owner
);
224 * Dquot List Management:
225 * The quota code uses three lists for dquot management: the inuse_list,
226 * free_dquots, and dquot_hash[] array. A single dquot structure may be
227 * on all three lists, depending on its current state.
229 * All dquots are placed to the end of inuse_list when first created, and this
230 * list is used for invalidate operation, which must look at every dquot.
232 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
233 * and this list is searched whenever we need an available dquot. Dquots are
234 * removed from the list as soon as they are used again, and
235 * dqstats.free_dquots gives the number of dquots on the list. When
236 * dquot is invalidated it's completely released from memory.
238 * Dquots with a specific identity (device, type and id) are placed on
239 * one of the dquot_hash[] hash chains. The provides an efficient search
240 * mechanism to locate a specific dquot.
243 static LIST_HEAD(inuse_list
);
244 static LIST_HEAD(free_dquots
);
245 static unsigned int dq_hash_bits
, dq_hash_mask
;
246 static struct hlist_head
*dquot_hash
;
248 struct dqstats dqstats
;
249 EXPORT_SYMBOL(dqstats
);
251 static qsize_t
inode_get_rsv_space(struct inode
*inode
);
252 static qsize_t
__inode_get_rsv_space(struct inode
*inode
);
253 static int __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 (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
351 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NOLIST_DIRTY
)
352 return test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
);
354 /* If quota is dirty already, we don't have to acquire dq_list_lock */
355 if (test_bit(DQ_MOD_B
, &dquot
->dq_flags
))
358 spin_lock(&dq_list_lock
);
359 if (!test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
)) {
360 list_add(&dquot
->dq_dirty
, &sb_dqopt(dquot
->dq_sb
)->
361 info
[dquot
->dq_id
.type
].dqi_dirty_list
);
364 spin_unlock(&dq_list_lock
);
367 EXPORT_SYMBOL(dquot_mark_dquot_dirty
);
369 /* Dirtify all the dquots - this can block when journalling */
370 static inline int mark_all_dquot_dirty(struct dquot
* const *dquot
)
375 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
377 /* Even in case of error we have to continue */
378 ret
= mark_dquot_dirty(dquot
[cnt
]);
385 static inline void dqput_all(struct dquot
**dquot
)
389 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
393 static inline int clear_dquot_dirty(struct dquot
*dquot
)
395 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NOLIST_DIRTY
)
396 return test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
);
398 spin_lock(&dq_list_lock
);
399 if (!test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
)) {
400 spin_unlock(&dq_list_lock
);
403 list_del_init(&dquot
->dq_dirty
);
404 spin_unlock(&dq_list_lock
);
408 void mark_info_dirty(struct super_block
*sb
, int type
)
410 spin_lock(&dq_data_lock
);
411 sb_dqopt(sb
)->info
[type
].dqi_flags
|= DQF_INFO_DIRTY
;
412 spin_unlock(&dq_data_lock
);
414 EXPORT_SYMBOL(mark_info_dirty
);
417 * Read dquot from disk and alloc space for it
420 int dquot_acquire(struct dquot
*dquot
)
422 int ret
= 0, ret2
= 0;
423 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
425 mutex_lock(&dquot
->dq_lock
);
426 if (!test_bit(DQ_READ_B
, &dquot
->dq_flags
))
427 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->read_dqblk(dquot
);
430 /* Make sure flags update is visible after dquot has been filled */
431 smp_mb__before_atomic();
432 set_bit(DQ_READ_B
, &dquot
->dq_flags
);
433 /* Instantiate dquot if needed */
434 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && !dquot
->dq_off
) {
435 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->commit_dqblk(dquot
);
436 /* Write the info if needed */
437 if (info_dirty(&dqopt
->info
[dquot
->dq_id
.type
])) {
438 ret2
= dqopt
->ops
[dquot
->dq_id
.type
]->write_file_info(
439 dquot
->dq_sb
, dquot
->dq_id
.type
);
449 * Make sure flags update is visible after on-disk struct has been
450 * allocated. Paired with smp_rmb() in dqget().
452 smp_mb__before_atomic();
453 set_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
455 mutex_unlock(&dquot
->dq_lock
);
458 EXPORT_SYMBOL(dquot_acquire
);
461 * Write dquot to disk
463 int dquot_commit(struct dquot
*dquot
)
466 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
468 mutex_lock(&dquot
->dq_lock
);
469 if (!clear_dquot_dirty(dquot
))
471 /* Inactive dquot can be only if there was error during read/init
472 * => we have better not writing it */
473 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
474 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->commit_dqblk(dquot
);
478 mutex_unlock(&dquot
->dq_lock
);
481 EXPORT_SYMBOL(dquot_commit
);
486 int dquot_release(struct dquot
*dquot
)
488 int ret
= 0, ret2
= 0;
489 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
491 mutex_lock(&dquot
->dq_lock
);
492 /* Check whether we are not racing with some other dqget() */
493 if (atomic_read(&dquot
->dq_count
) > 1)
495 if (dqopt
->ops
[dquot
->dq_id
.type
]->release_dqblk
) {
496 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->release_dqblk(dquot
);
498 if (info_dirty(&dqopt
->info
[dquot
->dq_id
.type
])) {
499 ret2
= dqopt
->ops
[dquot
->dq_id
.type
]->write_file_info(
500 dquot
->dq_sb
, dquot
->dq_id
.type
);
505 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
507 mutex_unlock(&dquot
->dq_lock
);
510 EXPORT_SYMBOL(dquot_release
);
512 void dquot_destroy(struct dquot
*dquot
)
514 kmem_cache_free(dquot_cachep
, dquot
);
516 EXPORT_SYMBOL(dquot_destroy
);
518 static inline void do_destroy_dquot(struct dquot
*dquot
)
520 dquot
->dq_sb
->dq_op
->destroy_dquot(dquot
);
523 /* Invalidate all dquots on the list. Note that this function is called after
524 * quota is disabled and pointers from inodes removed so there cannot be new
525 * quota users. There can still be some users of quotas due to inodes being
526 * just deleted or pruned by prune_icache() (those are not attached to any
527 * list) or parallel quotactl call. We have to wait for such users.
529 static void invalidate_dquots(struct super_block
*sb
, int type
)
531 struct dquot
*dquot
, *tmp
;
534 spin_lock(&dq_list_lock
);
535 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
536 if (dquot
->dq_sb
!= sb
)
538 if (dquot
->dq_id
.type
!= type
)
540 /* Wait for dquot users */
541 if (atomic_read(&dquot
->dq_count
)) {
543 spin_unlock(&dq_list_lock
);
545 * Once dqput() wakes us up, we know it's time to free
547 * IMPORTANT: we rely on the fact that there is always
548 * at most one process waiting for dquot to free.
549 * Otherwise dq_count would be > 1 and we would never
552 wait_event(dquot_ref_wq
,
553 atomic_read(&dquot
->dq_count
) == 1);
555 /* At this moment dquot() need not exist (it could be
556 * reclaimed by prune_dqcache(). Hence we must
561 * Quota now has no users and it has been written on last
564 remove_dquot_hash(dquot
);
565 remove_free_dquot(dquot
);
567 do_destroy_dquot(dquot
);
569 spin_unlock(&dq_list_lock
);
572 /* Call callback for every active dquot on given filesystem */
573 int dquot_scan_active(struct super_block
*sb
,
574 int (*fn
)(struct dquot
*dquot
, unsigned long priv
),
577 struct dquot
*dquot
, *old_dquot
= NULL
;
580 WARN_ON_ONCE(!rwsem_is_locked(&sb
->s_umount
));
582 spin_lock(&dq_list_lock
);
583 list_for_each_entry(dquot
, &inuse_list
, dq_inuse
) {
584 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
586 if (dquot
->dq_sb
!= sb
)
588 /* Now we have active dquot so we can just increase use count */
589 atomic_inc(&dquot
->dq_count
);
590 spin_unlock(&dq_list_lock
);
591 dqstats_inc(DQST_LOOKUPS
);
595 * ->release_dquot() can be racing with us. Our reference
596 * protects us from new calls to it so just wait for any
597 * outstanding call and recheck the DQ_ACTIVE_B after that.
599 wait_on_dquot(dquot
);
600 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
601 ret
= fn(dquot
, priv
);
605 spin_lock(&dq_list_lock
);
606 /* We are safe to continue now because our dquot could not
607 * be moved out of the inuse list while we hold the reference */
609 spin_unlock(&dq_list_lock
);
614 EXPORT_SYMBOL(dquot_scan_active
);
616 /* Write all dquot structures to quota files */
617 int dquot_writeback_dquots(struct super_block
*sb
, int type
)
619 struct list_head
*dirty
;
621 struct quota_info
*dqopt
= sb_dqopt(sb
);
625 WARN_ON_ONCE(!rwsem_is_locked(&sb
->s_umount
));
627 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
628 if (type
!= -1 && cnt
!= type
)
630 if (!sb_has_quota_active(sb
, cnt
))
632 spin_lock(&dq_list_lock
);
633 dirty
= &dqopt
->info
[cnt
].dqi_dirty_list
;
634 while (!list_empty(dirty
)) {
635 dquot
= list_first_entry(dirty
, struct dquot
,
638 WARN_ON(!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
));
640 /* Now we have active dquot from which someone is
641 * holding reference so we can safely just increase
644 spin_unlock(&dq_list_lock
);
645 dqstats_inc(DQST_LOOKUPS
);
646 err
= sb
->dq_op
->write_dquot(dquot
);
650 spin_lock(&dq_list_lock
);
652 spin_unlock(&dq_list_lock
);
655 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
656 if ((cnt
== type
|| type
== -1) && sb_has_quota_active(sb
, cnt
)
657 && info_dirty(&dqopt
->info
[cnt
]))
658 sb
->dq_op
->write_info(sb
, cnt
);
659 dqstats_inc(DQST_SYNCS
);
663 EXPORT_SYMBOL(dquot_writeback_dquots
);
665 /* Write all dquot structures to disk and make them visible from userspace */
666 int dquot_quota_sync(struct super_block
*sb
, int type
)
668 struct quota_info
*dqopt
= sb_dqopt(sb
);
672 ret
= dquot_writeback_dquots(sb
, type
);
675 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
678 /* This is not very clever (and fast) but currently I don't know about
679 * any other simple way of getting quota data to disk and we must get
680 * them there for userspace to be visible... */
681 if (sb
->s_op
->sync_fs
)
682 sb
->s_op
->sync_fs(sb
, 1);
683 sync_blockdev(sb
->s_bdev
);
686 * Now when everything is written we can discard the pagecache so
687 * that userspace sees the changes.
689 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
690 if (type
!= -1 && cnt
!= type
)
692 if (!sb_has_quota_active(sb
, cnt
))
694 inode_lock(dqopt
->files
[cnt
]);
695 truncate_inode_pages(&dqopt
->files
[cnt
]->i_data
, 0);
696 inode_unlock(dqopt
->files
[cnt
]);
701 EXPORT_SYMBOL(dquot_quota_sync
);
704 dqcache_shrink_scan(struct shrinker
*shrink
, struct shrink_control
*sc
)
706 struct list_head
*head
;
708 unsigned long freed
= 0;
710 spin_lock(&dq_list_lock
);
711 head
= free_dquots
.prev
;
712 while (head
!= &free_dquots
&& sc
->nr_to_scan
) {
713 dquot
= list_entry(head
, struct dquot
, dq_free
);
714 remove_dquot_hash(dquot
);
715 remove_free_dquot(dquot
);
717 do_destroy_dquot(dquot
);
720 head
= free_dquots
.prev
;
722 spin_unlock(&dq_list_lock
);
727 dqcache_shrink_count(struct shrinker
*shrink
, struct shrink_control
*sc
)
729 return vfs_pressure_ratio(
730 percpu_counter_read_positive(&dqstats
.counter
[DQST_FREE_DQUOTS
]));
733 static struct shrinker dqcache_shrinker
= {
734 .count_objects
= dqcache_shrink_count
,
735 .scan_objects
= dqcache_shrink_scan
,
736 .seeks
= DEFAULT_SEEKS
,
740 * Put reference to dquot
742 void dqput(struct dquot
*dquot
)
748 #ifdef CONFIG_QUOTA_DEBUG
749 if (!atomic_read(&dquot
->dq_count
)) {
750 quota_error(dquot
->dq_sb
, "trying to free free dquot of %s %d",
751 quotatypes
[dquot
->dq_id
.type
],
752 from_kqid(&init_user_ns
, dquot
->dq_id
));
756 dqstats_inc(DQST_DROPS
);
758 spin_lock(&dq_list_lock
);
759 if (atomic_read(&dquot
->dq_count
) > 1) {
760 /* We have more than one user... nothing to do */
761 atomic_dec(&dquot
->dq_count
);
762 /* Releasing dquot during quotaoff phase? */
763 if (!sb_has_quota_active(dquot
->dq_sb
, dquot
->dq_id
.type
) &&
764 atomic_read(&dquot
->dq_count
) == 1)
765 wake_up(&dquot_ref_wq
);
766 spin_unlock(&dq_list_lock
);
769 /* Need to release dquot? */
770 if (dquot_dirty(dquot
)) {
771 spin_unlock(&dq_list_lock
);
772 /* Commit dquot before releasing */
773 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
775 quota_error(dquot
->dq_sb
, "Can't write quota structure"
776 " (error %d). Quota may get out of sync!",
779 * We clear dirty bit anyway, so that we avoid
782 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
);
821 dquot
->dq_id
= make_kqid_invalid(type
);
822 atomic_set(&dquot
->dq_count
, 1);
823 spin_lock_init(&dquot
->dq_dqb_lock
);
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
, *empty
= NULL
;
841 if (!qid_has_mapping(sb
->s_user_ns
, qid
))
842 return ERR_PTR(-EINVAL
);
844 if (!sb_has_quota_active(sb
, qid
.type
))
845 return ERR_PTR(-ESRCH
);
847 spin_lock(&dq_list_lock
);
848 spin_lock(&dq_state_lock
);
849 if (!sb_has_quota_active(sb
, qid
.type
)) {
850 spin_unlock(&dq_state_lock
);
851 spin_unlock(&dq_list_lock
);
852 dquot
= ERR_PTR(-ESRCH
);
855 spin_unlock(&dq_state_lock
);
857 dquot
= find_dquot(hashent
, sb
, qid
);
860 spin_unlock(&dq_list_lock
);
861 empty
= get_empty_dquot(sb
, qid
.type
);
863 schedule(); /* Try to wait for a moment... */
869 /* all dquots go on the inuse_list */
871 /* hash it first so it can be found */
872 insert_dquot_hash(dquot
);
873 spin_unlock(&dq_list_lock
);
874 dqstats_inc(DQST_LOOKUPS
);
876 if (!atomic_read(&dquot
->dq_count
))
877 remove_free_dquot(dquot
);
878 atomic_inc(&dquot
->dq_count
);
879 spin_unlock(&dq_list_lock
);
880 dqstats_inc(DQST_CACHE_HITS
);
881 dqstats_inc(DQST_LOOKUPS
);
883 /* Wait for dq_lock - after this we know that either dquot_release() is
884 * already finished or it will be canceled due to dq_count > 1 test */
885 wait_on_dquot(dquot
);
886 /* Read the dquot / allocate space in quota file */
887 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
890 err
= sb
->dq_op
->acquire_dquot(dquot
);
893 dquot
= ERR_PTR(err
);
898 * Make sure following reads see filled structure - paired with
899 * smp_mb__before_atomic() in dquot_acquire().
902 #ifdef CONFIG_QUOTA_DEBUG
903 BUG_ON(!dquot
->dq_sb
); /* Has somebody invalidated entry under us? */
907 do_destroy_dquot(empty
);
911 EXPORT_SYMBOL(dqget
);
913 static inline struct dquot
**i_dquot(struct inode
*inode
)
915 return inode
->i_sb
->s_op
->get_dquots(inode
);
918 static int dqinit_needed(struct inode
*inode
, int type
)
920 struct dquot
* const *dquots
;
923 if (IS_NOQUOTA(inode
))
926 dquots
= i_dquot(inode
);
928 return !dquots
[type
];
929 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
935 /* This routine is guarded by s_umount semaphore */
936 static void add_dquot_ref(struct super_block
*sb
, int type
)
938 struct inode
*inode
, *old_inode
= NULL
;
939 #ifdef CONFIG_QUOTA_DEBUG
943 spin_lock(&sb
->s_inode_list_lock
);
944 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
945 spin_lock(&inode
->i_lock
);
946 if ((inode
->i_state
& (I_FREEING
|I_WILL_FREE
|I_NEW
)) ||
947 !atomic_read(&inode
->i_writecount
) ||
948 !dqinit_needed(inode
, type
)) {
949 spin_unlock(&inode
->i_lock
);
953 spin_unlock(&inode
->i_lock
);
954 spin_unlock(&sb
->s_inode_list_lock
);
956 #ifdef CONFIG_QUOTA_DEBUG
957 if (unlikely(inode_get_rsv_space(inode
) > 0))
961 __dquot_initialize(inode
, type
);
964 * We hold a reference to 'inode' so it couldn't have been
965 * removed from s_inodes list while we dropped the
966 * s_inode_list_lock. We cannot iput the inode now as we can be
967 * holding the last reference and we cannot iput it under
968 * s_inode_list_lock. So we keep the reference and iput it
972 spin_lock(&sb
->s_inode_list_lock
);
974 spin_unlock(&sb
->s_inode_list_lock
);
977 #ifdef CONFIG_QUOTA_DEBUG
979 quota_error(sb
, "Writes happened before quota was turned on "
980 "thus quota information is probably inconsistent. "
981 "Please run quotacheck(8)");
987 * Remove references to dquots from inode and add dquot to list for freeing
988 * if we have the last reference to dquot
990 static void remove_inode_dquot_ref(struct inode
*inode
, int type
,
991 struct list_head
*tofree_head
)
993 struct dquot
**dquots
= i_dquot(inode
);
994 struct dquot
*dquot
= dquots
[type
];
1000 if (list_empty(&dquot
->dq_free
)) {
1002 * The inode still has reference to dquot so it can't be in the
1005 spin_lock(&dq_list_lock
);
1006 list_add(&dquot
->dq_free
, tofree_head
);
1007 spin_unlock(&dq_list_lock
);
1010 * Dquot is already in a list to put so we won't drop the last
1018 * Free list of dquots
1019 * Dquots are removed from inodes and no new references can be got so we are
1020 * the only ones holding reference
1022 static void put_dquot_list(struct list_head
*tofree_head
)
1024 struct list_head
*act_head
;
1025 struct dquot
*dquot
;
1027 act_head
= tofree_head
->next
;
1028 while (act_head
!= tofree_head
) {
1029 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
1030 act_head
= act_head
->next
;
1031 /* Remove dquot from the list so we won't have problems... */
1032 list_del_init(&dquot
->dq_free
);
1037 static void remove_dquot_ref(struct super_block
*sb
, int type
,
1038 struct list_head
*tofree_head
)
1040 struct inode
*inode
;
1043 spin_lock(&sb
->s_inode_list_lock
);
1044 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
1046 * We have to scan also I_NEW inodes because they can already
1047 * have quota pointer initialized. Luckily, we need to touch
1048 * only quota pointers and these have separate locking
1051 spin_lock(&dq_data_lock
);
1052 if (!IS_NOQUOTA(inode
)) {
1053 if (unlikely(inode_get_rsv_space(inode
) > 0))
1055 remove_inode_dquot_ref(inode
, type
, tofree_head
);
1057 spin_unlock(&dq_data_lock
);
1059 spin_unlock(&sb
->s_inode_list_lock
);
1060 #ifdef CONFIG_QUOTA_DEBUG
1062 printk(KERN_WARNING
"VFS (%s): Writes happened after quota"
1063 " was disabled thus quota information is probably "
1064 "inconsistent. Please run quotacheck(8).\n", sb
->s_id
);
1069 /* Gather all references from inodes and drop them */
1070 static void drop_dquot_ref(struct super_block
*sb
, int type
)
1072 LIST_HEAD(tofree_head
);
1075 remove_dquot_ref(sb
, type
, &tofree_head
);
1076 synchronize_srcu(&dquot_srcu
);
1077 put_dquot_list(&tofree_head
);
1082 void dquot_free_reserved_space(struct dquot
*dquot
, qsize_t number
)
1084 if (dquot
->dq_dqb
.dqb_rsvspace
>= number
)
1085 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1088 dquot
->dq_dqb
.dqb_rsvspace
= 0;
1090 if (dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
<=
1091 dquot
->dq_dqb
.dqb_bsoftlimit
)
1092 dquot
->dq_dqb
.dqb_btime
= (time64_t
) 0;
1093 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1096 static void dquot_decr_inodes(struct dquot
*dquot
, qsize_t number
)
1098 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1099 dquot
->dq_dqb
.dqb_curinodes
>= number
)
1100 dquot
->dq_dqb
.dqb_curinodes
-= number
;
1102 dquot
->dq_dqb
.dqb_curinodes
= 0;
1103 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1104 dquot
->dq_dqb
.dqb_itime
= (time64_t
) 0;
1105 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
1108 static void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
1110 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1111 dquot
->dq_dqb
.dqb_curspace
>= number
)
1112 dquot
->dq_dqb
.dqb_curspace
-= number
;
1114 dquot
->dq_dqb
.dqb_curspace
= 0;
1115 if (dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
<=
1116 dquot
->dq_dqb
.dqb_bsoftlimit
)
1117 dquot
->dq_dqb
.dqb_btime
= (time64_t
) 0;
1118 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1122 struct super_block
*w_sb
;
1123 struct kqid w_dq_id
;
1127 static int warning_issued(struct dquot
*dquot
, const int warntype
)
1129 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
1130 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
1131 ((warntype
== QUOTA_NL_IHARDWARN
||
1132 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
1136 return test_and_set_bit(flag
, &dquot
->dq_flags
);
1139 #ifdef CONFIG_PRINT_QUOTA_WARNING
1140 static int flag_print_warnings
= 1;
1142 static int need_print_warning(struct dquot_warn
*warn
)
1144 if (!flag_print_warnings
)
1147 switch (warn
->w_dq_id
.type
) {
1149 return uid_eq(current_fsuid(), warn
->w_dq_id
.uid
);
1151 return in_group_p(warn
->w_dq_id
.gid
);
1158 /* Print warning to user which exceeded quota */
1159 static void print_warning(struct dquot_warn
*warn
)
1162 struct tty_struct
*tty
;
1163 int warntype
= warn
->w_type
;
1165 if (warntype
== QUOTA_NL_IHARDBELOW
||
1166 warntype
== QUOTA_NL_ISOFTBELOW
||
1167 warntype
== QUOTA_NL_BHARDBELOW
||
1168 warntype
== QUOTA_NL_BSOFTBELOW
|| !need_print_warning(warn
))
1171 tty
= get_current_tty();
1174 tty_write_message(tty
, warn
->w_sb
->s_id
);
1175 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
1176 tty_write_message(tty
, ": warning, ");
1178 tty_write_message(tty
, ": write failed, ");
1179 tty_write_message(tty
, quotatypes
[warn
->w_dq_id
.type
]);
1181 case QUOTA_NL_IHARDWARN
:
1182 msg
= " file limit reached.\r\n";
1184 case QUOTA_NL_ISOFTLONGWARN
:
1185 msg
= " file quota exceeded too long.\r\n";
1187 case QUOTA_NL_ISOFTWARN
:
1188 msg
= " file quota exceeded.\r\n";
1190 case QUOTA_NL_BHARDWARN
:
1191 msg
= " block limit reached.\r\n";
1193 case QUOTA_NL_BSOFTLONGWARN
:
1194 msg
= " block quota exceeded too long.\r\n";
1196 case QUOTA_NL_BSOFTWARN
:
1197 msg
= " block quota exceeded.\r\n";
1200 tty_write_message(tty
, msg
);
1205 static void prepare_warning(struct dquot_warn
*warn
, struct dquot
*dquot
,
1208 if (warning_issued(dquot
, warntype
))
1210 warn
->w_type
= warntype
;
1211 warn
->w_sb
= dquot
->dq_sb
;
1212 warn
->w_dq_id
= dquot
->dq_id
;
1216 * Write warnings to the console and send warning messages over netlink.
1218 * Note that this function can call into tty and networking code.
1220 static void flush_warnings(struct dquot_warn
*warn
)
1224 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1225 if (warn
[i
].w_type
== QUOTA_NL_NOWARN
)
1227 #ifdef CONFIG_PRINT_QUOTA_WARNING
1228 print_warning(&warn
[i
]);
1230 quota_send_warning(warn
[i
].w_dq_id
,
1231 warn
[i
].w_sb
->s_dev
, warn
[i
].w_type
);
1235 static int ignore_hardlimit(struct dquot
*dquot
)
1237 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
];
1239 return capable(CAP_SYS_RESOURCE
) &&
1240 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
||
1241 !(info
->dqi_flags
& DQF_ROOT_SQUASH
));
1244 static int dquot_add_inodes(struct dquot
*dquot
, qsize_t inodes
,
1245 struct dquot_warn
*warn
)
1250 spin_lock(&dquot
->dq_dqb_lock
);
1251 newinodes
= dquot
->dq_dqb
.dqb_curinodes
+ inodes
;
1252 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_id
.type
) ||
1253 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1256 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1257 newinodes
> dquot
->dq_dqb
.dqb_ihardlimit
&&
1258 !ignore_hardlimit(dquot
)) {
1259 prepare_warning(warn
, dquot
, QUOTA_NL_IHARDWARN
);
1264 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1265 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1266 dquot
->dq_dqb
.dqb_itime
&&
1267 ktime_get_real_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1268 !ignore_hardlimit(dquot
)) {
1269 prepare_warning(warn
, dquot
, QUOTA_NL_ISOFTLONGWARN
);
1274 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1275 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1276 dquot
->dq_dqb
.dqb_itime
== 0) {
1277 prepare_warning(warn
, dquot
, QUOTA_NL_ISOFTWARN
);
1278 dquot
->dq_dqb
.dqb_itime
= ktime_get_real_seconds() +
1279 sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
].dqi_igrace
;
1282 dquot
->dq_dqb
.dqb_curinodes
= newinodes
;
1285 spin_unlock(&dquot
->dq_dqb_lock
);
1289 static int dquot_add_space(struct dquot
*dquot
, qsize_t space
,
1290 qsize_t rsv_space
, unsigned int flags
,
1291 struct dquot_warn
*warn
)
1294 struct super_block
*sb
= dquot
->dq_sb
;
1297 spin_lock(&dquot
->dq_dqb_lock
);
1298 if (!sb_has_quota_limits_enabled(sb
, dquot
->dq_id
.type
) ||
1299 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1302 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
1303 + space
+ rsv_space
;
1305 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1306 tspace
> dquot
->dq_dqb
.dqb_bhardlimit
&&
1307 !ignore_hardlimit(dquot
)) {
1308 if (flags
& DQUOT_SPACE_WARN
)
1309 prepare_warning(warn
, dquot
, QUOTA_NL_BHARDWARN
);
1314 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1315 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1316 dquot
->dq_dqb
.dqb_btime
&&
1317 ktime_get_real_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1318 !ignore_hardlimit(dquot
)) {
1319 if (flags
& DQUOT_SPACE_WARN
)
1320 prepare_warning(warn
, dquot
, QUOTA_NL_BSOFTLONGWARN
);
1325 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1326 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1327 dquot
->dq_dqb
.dqb_btime
== 0) {
1328 if (flags
& DQUOT_SPACE_WARN
) {
1329 prepare_warning(warn
, dquot
, QUOTA_NL_BSOFTWARN
);
1330 dquot
->dq_dqb
.dqb_btime
= ktime_get_real_seconds() +
1331 sb_dqopt(sb
)->info
[dquot
->dq_id
.type
].dqi_bgrace
;
1334 * We don't allow preallocation to exceed softlimit so exceeding will
1343 * We have to be careful and go through warning generation & grace time
1344 * setting even if DQUOT_SPACE_NOFAIL is set. That's why we check it
1347 if (flags
& DQUOT_SPACE_NOFAIL
)
1350 dquot
->dq_dqb
.dqb_rsvspace
+= rsv_space
;
1351 dquot
->dq_dqb
.dqb_curspace
+= space
;
1353 spin_unlock(&dquot
->dq_dqb_lock
);
1357 static int info_idq_free(struct dquot
*dquot
, qsize_t inodes
)
1361 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1362 dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
||
1363 !sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_id
.type
))
1364 return QUOTA_NL_NOWARN
;
1366 newinodes
= dquot
->dq_dqb
.dqb_curinodes
- inodes
;
1367 if (newinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1368 return QUOTA_NL_ISOFTBELOW
;
1369 if (dquot
->dq_dqb
.dqb_curinodes
>= dquot
->dq_dqb
.dqb_ihardlimit
&&
1370 newinodes
< dquot
->dq_dqb
.dqb_ihardlimit
)
1371 return QUOTA_NL_IHARDBELOW
;
1372 return QUOTA_NL_NOWARN
;
1375 static int info_bdq_free(struct dquot
*dquot
, qsize_t space
)
1379 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
;
1381 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1382 tspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1383 return QUOTA_NL_NOWARN
;
1385 if (tspace
- space
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1386 return QUOTA_NL_BSOFTBELOW
;
1387 if (tspace
>= dquot
->dq_dqb
.dqb_bhardlimit
&&
1388 tspace
- space
< dquot
->dq_dqb
.dqb_bhardlimit
)
1389 return QUOTA_NL_BHARDBELOW
;
1390 return QUOTA_NL_NOWARN
;
1393 static int dquot_active(const struct inode
*inode
)
1395 struct super_block
*sb
= inode
->i_sb
;
1397 if (IS_NOQUOTA(inode
))
1399 return sb_any_quota_loaded(sb
) & ~sb_any_quota_suspended(sb
);
1403 * Initialize quota pointers in inode
1405 * It is better to call this function outside of any transaction as it
1406 * might need a lot of space in journal for dquot structure allocation.
1408 static int __dquot_initialize(struct inode
*inode
, int type
)
1410 int cnt
, init_needed
= 0;
1411 struct dquot
**dquots
, *got
[MAXQUOTAS
] = {};
1412 struct super_block
*sb
= inode
->i_sb
;
1416 if (!dquot_active(inode
))
1419 dquots
= i_dquot(inode
);
1421 /* First get references to structures we might need. */
1422 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1426 struct dquot
*dquot
;
1428 if (type
!= -1 && cnt
!= type
)
1431 * The i_dquot should have been initialized in most cases,
1432 * we check it without locking here to avoid unnecessary
1433 * dqget()/dqput() calls.
1438 if (!sb_has_quota_active(sb
, cnt
))
1445 qid
= make_kqid_uid(inode
->i_uid
);
1448 qid
= make_kqid_gid(inode
->i_gid
);
1451 rc
= inode
->i_sb
->dq_op
->get_projid(inode
, &projid
);
1454 qid
= make_kqid_projid(projid
);
1457 dquot
= dqget(sb
, qid
);
1458 if (IS_ERR(dquot
)) {
1459 /* We raced with somebody turning quotas off... */
1460 if (PTR_ERR(dquot
) != -ESRCH
) {
1461 ret
= PTR_ERR(dquot
);
1469 /* All required i_dquot has been initialized */
1473 spin_lock(&dq_data_lock
);
1474 if (IS_NOQUOTA(inode
))
1476 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1477 if (type
!= -1 && cnt
!= type
)
1479 /* Avoid races with quotaoff() */
1480 if (!sb_has_quota_active(sb
, cnt
))
1482 /* We could race with quotaon or dqget() could have failed */
1486 dquots
[cnt
] = got
[cnt
];
1489 * Make quota reservation system happy if someone
1490 * did a write before quota was turned on
1492 rsv
= inode_get_rsv_space(inode
);
1493 if (unlikely(rsv
)) {
1494 spin_lock(&inode
->i_lock
);
1495 /* Get reservation again under proper lock */
1496 rsv
= __inode_get_rsv_space(inode
);
1497 spin_lock(&dquots
[cnt
]->dq_dqb_lock
);
1498 dquots
[cnt
]->dq_dqb
.dqb_rsvspace
+= rsv
;
1499 spin_unlock(&dquots
[cnt
]->dq_dqb_lock
);
1500 spin_unlock(&inode
->i_lock
);
1505 spin_unlock(&dq_data_lock
);
1507 /* Drop unused references */
1513 int dquot_initialize(struct inode
*inode
)
1515 return __dquot_initialize(inode
, -1);
1517 EXPORT_SYMBOL(dquot_initialize
);
1519 bool dquot_initialize_needed(struct inode
*inode
)
1521 struct dquot
**dquots
;
1524 if (!dquot_active(inode
))
1527 dquots
= i_dquot(inode
);
1528 for (i
= 0; i
< MAXQUOTAS
; i
++)
1529 if (!dquots
[i
] && sb_has_quota_active(inode
->i_sb
, i
))
1533 EXPORT_SYMBOL(dquot_initialize_needed
);
1536 * Release all quotas referenced by inode.
1538 * This function only be called on inode free or converting
1539 * a file to quota file, no other users for the i_dquot in
1540 * both cases, so we needn't call synchronize_srcu() after
1543 static void __dquot_drop(struct inode
*inode
)
1546 struct dquot
**dquots
= i_dquot(inode
);
1547 struct dquot
*put
[MAXQUOTAS
];
1549 spin_lock(&dq_data_lock
);
1550 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1551 put
[cnt
] = dquots
[cnt
];
1554 spin_unlock(&dq_data_lock
);
1558 void dquot_drop(struct inode
*inode
)
1560 struct dquot
* const *dquots
;
1563 if (IS_NOQUOTA(inode
))
1567 * Test before calling to rule out calls from proc and such
1568 * where we are not allowed to block. Note that this is
1569 * actually reliable test even without the lock - the caller
1570 * must assure that nobody can come after the DQUOT_DROP and
1571 * add quota pointers back anyway.
1573 dquots
= i_dquot(inode
);
1574 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1579 if (cnt
< MAXQUOTAS
)
1580 __dquot_drop(inode
);
1582 EXPORT_SYMBOL(dquot_drop
);
1585 * inode_reserved_space is managed internally by quota, and protected by
1586 * i_lock similar to i_blocks+i_bytes.
1588 static qsize_t
*inode_reserved_space(struct inode
* inode
)
1590 /* Filesystem must explicitly define it's own method in order to use
1591 * quota reservation interface */
1592 BUG_ON(!inode
->i_sb
->dq_op
->get_reserved_space
);
1593 return inode
->i_sb
->dq_op
->get_reserved_space(inode
);
1596 static qsize_t
__inode_get_rsv_space(struct inode
*inode
)
1598 if (!inode
->i_sb
->dq_op
->get_reserved_space
)
1600 return *inode_reserved_space(inode
);
1603 static qsize_t
inode_get_rsv_space(struct inode
*inode
)
1607 if (!inode
->i_sb
->dq_op
->get_reserved_space
)
1609 spin_lock(&inode
->i_lock
);
1610 ret
= __inode_get_rsv_space(inode
);
1611 spin_unlock(&inode
->i_lock
);
1616 * This functions updates i_blocks+i_bytes fields and quota information
1617 * (together with appropriate checks).
1619 * NOTE: We absolutely rely on the fact that caller dirties the inode
1620 * (usually helpers in quotaops.h care about this) and holds a handle for
1621 * the current transaction so that dquot write and inode write go into the
1626 * This operation can block, but only after everything is updated
1628 int __dquot_alloc_space(struct inode
*inode
, qsize_t number
, int flags
)
1630 int cnt
, ret
= 0, index
;
1631 struct dquot_warn warn
[MAXQUOTAS
];
1632 int reserve
= flags
& DQUOT_SPACE_RESERVE
;
1633 struct dquot
**dquots
;
1635 if (!dquot_active(inode
)) {
1637 spin_lock(&inode
->i_lock
);
1638 *inode_reserved_space(inode
) += number
;
1639 spin_unlock(&inode
->i_lock
);
1641 inode_add_bytes(inode
, number
);
1646 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1647 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1649 dquots
= i_dquot(inode
);
1650 index
= srcu_read_lock(&dquot_srcu
);
1651 spin_lock(&inode
->i_lock
);
1652 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1655 if (flags
& DQUOT_SPACE_RESERVE
) {
1656 ret
= dquot_add_space(dquots
[cnt
], 0, number
, flags
,
1659 ret
= dquot_add_space(dquots
[cnt
], number
, 0, flags
,
1663 /* Back out changes we already did */
1664 for (cnt
--; cnt
>= 0; cnt
--) {
1667 spin_lock(&dquots
[cnt
]->dq_dqb_lock
);
1668 if (flags
& DQUOT_SPACE_RESERVE
) {
1669 dquots
[cnt
]->dq_dqb
.dqb_rsvspace
-=
1672 dquots
[cnt
]->dq_dqb
.dqb_curspace
-=
1675 spin_unlock(&dquots
[cnt
]->dq_dqb_lock
);
1677 spin_unlock(&inode
->i_lock
);
1678 goto out_flush_warn
;
1682 *inode_reserved_space(inode
) += number
;
1684 __inode_add_bytes(inode
, number
);
1685 spin_unlock(&inode
->i_lock
);
1688 goto out_flush_warn
;
1689 mark_all_dquot_dirty(dquots
);
1691 srcu_read_unlock(&dquot_srcu
, index
);
1692 flush_warnings(warn
);
1696 EXPORT_SYMBOL(__dquot_alloc_space
);
1699 * This operation can block, but only after everything is updated
1701 int dquot_alloc_inode(struct inode
*inode
)
1703 int cnt
, ret
= 0, index
;
1704 struct dquot_warn warn
[MAXQUOTAS
];
1705 struct dquot
* const *dquots
;
1707 if (!dquot_active(inode
))
1709 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1710 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1712 dquots
= i_dquot(inode
);
1713 index
= srcu_read_lock(&dquot_srcu
);
1714 spin_lock(&inode
->i_lock
);
1715 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1718 ret
= dquot_add_inodes(dquots
[cnt
], 1, &warn
[cnt
]);
1720 for (cnt
--; cnt
>= 0; cnt
--) {
1723 /* Back out changes we already did */
1724 spin_lock(&dquots
[cnt
]->dq_dqb_lock
);
1725 dquots
[cnt
]->dq_dqb
.dqb_curinodes
--;
1726 spin_unlock(&dquots
[cnt
]->dq_dqb_lock
);
1733 spin_unlock(&inode
->i_lock
);
1735 mark_all_dquot_dirty(dquots
);
1736 srcu_read_unlock(&dquot_srcu
, index
);
1737 flush_warnings(warn
);
1740 EXPORT_SYMBOL(dquot_alloc_inode
);
1743 * Convert in-memory reserved quotas to real consumed quotas
1745 int dquot_claim_space_nodirty(struct inode
*inode
, qsize_t number
)
1747 struct dquot
**dquots
;
1750 if (!dquot_active(inode
)) {
1751 spin_lock(&inode
->i_lock
);
1752 *inode_reserved_space(inode
) -= number
;
1753 __inode_add_bytes(inode
, number
);
1754 spin_unlock(&inode
->i_lock
);
1758 dquots
= i_dquot(inode
);
1759 index
= srcu_read_lock(&dquot_srcu
);
1760 spin_lock(&inode
->i_lock
);
1761 /* Claim reserved quotas to allocated quotas */
1762 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1764 struct dquot
*dquot
= dquots
[cnt
];
1766 spin_lock(&dquot
->dq_dqb_lock
);
1767 if (WARN_ON_ONCE(dquot
->dq_dqb
.dqb_rsvspace
< number
))
1768 number
= dquot
->dq_dqb
.dqb_rsvspace
;
1769 dquot
->dq_dqb
.dqb_curspace
+= number
;
1770 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1771 spin_unlock(&dquot
->dq_dqb_lock
);
1774 /* Update inode bytes */
1775 *inode_reserved_space(inode
) -= number
;
1776 __inode_add_bytes(inode
, number
);
1777 spin_unlock(&inode
->i_lock
);
1778 mark_all_dquot_dirty(dquots
);
1779 srcu_read_unlock(&dquot_srcu
, index
);
1782 EXPORT_SYMBOL(dquot_claim_space_nodirty
);
1785 * Convert allocated space back to in-memory reserved quotas
1787 void dquot_reclaim_space_nodirty(struct inode
*inode
, qsize_t number
)
1789 struct dquot
**dquots
;
1792 if (!dquot_active(inode
)) {
1793 spin_lock(&inode
->i_lock
);
1794 *inode_reserved_space(inode
) += number
;
1795 __inode_sub_bytes(inode
, number
);
1796 spin_unlock(&inode
->i_lock
);
1800 dquots
= i_dquot(inode
);
1801 index
= srcu_read_lock(&dquot_srcu
);
1802 spin_lock(&inode
->i_lock
);
1803 /* Claim reserved quotas to allocated quotas */
1804 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1806 struct dquot
*dquot
= dquots
[cnt
];
1808 spin_lock(&dquot
->dq_dqb_lock
);
1809 if (WARN_ON_ONCE(dquot
->dq_dqb
.dqb_curspace
< number
))
1810 number
= dquot
->dq_dqb
.dqb_curspace
;
1811 dquot
->dq_dqb
.dqb_rsvspace
+= number
;
1812 dquot
->dq_dqb
.dqb_curspace
-= number
;
1813 spin_unlock(&dquot
->dq_dqb_lock
);
1816 /* Update inode bytes */
1817 *inode_reserved_space(inode
) += number
;
1818 __inode_sub_bytes(inode
, number
);
1819 spin_unlock(&inode
->i_lock
);
1820 mark_all_dquot_dirty(dquots
);
1821 srcu_read_unlock(&dquot_srcu
, index
);
1824 EXPORT_SYMBOL(dquot_reclaim_space_nodirty
);
1827 * This operation can block, but only after everything is updated
1829 void __dquot_free_space(struct inode
*inode
, qsize_t number
, int flags
)
1832 struct dquot_warn warn
[MAXQUOTAS
];
1833 struct dquot
**dquots
;
1834 int reserve
= flags
& DQUOT_SPACE_RESERVE
, index
;
1836 if (!dquot_active(inode
)) {
1838 spin_lock(&inode
->i_lock
);
1839 *inode_reserved_space(inode
) -= number
;
1840 spin_unlock(&inode
->i_lock
);
1842 inode_sub_bytes(inode
, number
);
1847 dquots
= i_dquot(inode
);
1848 index
= srcu_read_lock(&dquot_srcu
);
1849 spin_lock(&inode
->i_lock
);
1850 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1853 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1856 spin_lock(&dquots
[cnt
]->dq_dqb_lock
);
1857 wtype
= info_bdq_free(dquots
[cnt
], number
);
1858 if (wtype
!= QUOTA_NL_NOWARN
)
1859 prepare_warning(&warn
[cnt
], dquots
[cnt
], wtype
);
1861 dquot_free_reserved_space(dquots
[cnt
], number
);
1863 dquot_decr_space(dquots
[cnt
], number
);
1864 spin_unlock(&dquots
[cnt
]->dq_dqb_lock
);
1867 *inode_reserved_space(inode
) -= number
;
1869 __inode_sub_bytes(inode
, number
);
1870 spin_unlock(&inode
->i_lock
);
1874 mark_all_dquot_dirty(dquots
);
1876 srcu_read_unlock(&dquot_srcu
, index
);
1877 flush_warnings(warn
);
1879 EXPORT_SYMBOL(__dquot_free_space
);
1882 * This operation can block, but only after everything is updated
1884 void dquot_free_inode(struct inode
*inode
)
1887 struct dquot_warn warn
[MAXQUOTAS
];
1888 struct dquot
* const *dquots
;
1891 if (!dquot_active(inode
))
1894 dquots
= i_dquot(inode
);
1895 index
= srcu_read_lock(&dquot_srcu
);
1896 spin_lock(&inode
->i_lock
);
1897 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1900 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1903 spin_lock(&dquots
[cnt
]->dq_dqb_lock
);
1904 wtype
= info_idq_free(dquots
[cnt
], 1);
1905 if (wtype
!= QUOTA_NL_NOWARN
)
1906 prepare_warning(&warn
[cnt
], dquots
[cnt
], wtype
);
1907 dquot_decr_inodes(dquots
[cnt
], 1);
1908 spin_unlock(&dquots
[cnt
]->dq_dqb_lock
);
1910 spin_unlock(&inode
->i_lock
);
1911 mark_all_dquot_dirty(dquots
);
1912 srcu_read_unlock(&dquot_srcu
, index
);
1913 flush_warnings(warn
);
1915 EXPORT_SYMBOL(dquot_free_inode
);
1918 * Transfer the number of inode and blocks from one diskquota to an other.
1919 * On success, dquot references in transfer_to are consumed and references
1920 * to original dquots that need to be released are placed there. On failure,
1921 * references are kept untouched.
1923 * This operation can block, but only after everything is updated
1924 * A transaction must be started when entering this function.
1926 * We are holding reference on transfer_from & transfer_to, no need to
1927 * protect them by srcu_read_lock().
1929 int __dquot_transfer(struct inode
*inode
, struct dquot
**transfer_to
)
1932 qsize_t rsv_space
= 0;
1933 qsize_t inode_usage
= 1;
1934 struct dquot
*transfer_from
[MAXQUOTAS
] = {};
1936 char is_valid
[MAXQUOTAS
] = {};
1937 struct dquot_warn warn_to
[MAXQUOTAS
];
1938 struct dquot_warn warn_from_inodes
[MAXQUOTAS
];
1939 struct dquot_warn warn_from_space
[MAXQUOTAS
];
1941 if (IS_NOQUOTA(inode
))
1944 if (inode
->i_sb
->dq_op
->get_inode_usage
) {
1945 ret
= inode
->i_sb
->dq_op
->get_inode_usage(inode
, &inode_usage
);
1950 /* Initialize the arrays */
1951 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1952 warn_to
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1953 warn_from_inodes
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1954 warn_from_space
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1957 spin_lock(&dq_data_lock
);
1958 spin_lock(&inode
->i_lock
);
1959 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1960 spin_unlock(&inode
->i_lock
);
1961 spin_unlock(&dq_data_lock
);
1964 cur_space
= __inode_get_bytes(inode
);
1965 rsv_space
= __inode_get_rsv_space(inode
);
1967 * Build the transfer_from list, check limits, and update usage in
1968 * the target structures.
1970 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1972 * Skip changes for same uid or gid or for turned off quota-type.
1974 if (!transfer_to
[cnt
])
1976 /* Avoid races with quotaoff() */
1977 if (!sb_has_quota_active(inode
->i_sb
, cnt
))
1980 transfer_from
[cnt
] = i_dquot(inode
)[cnt
];
1981 ret
= dquot_add_inodes(transfer_to
[cnt
], inode_usage
,
1985 ret
= dquot_add_space(transfer_to
[cnt
], cur_space
, rsv_space
, 0,
1988 spin_lock(&transfer_to
[cnt
]->dq_dqb_lock
);
1989 dquot_decr_inodes(transfer_to
[cnt
], inode_usage
);
1990 spin_unlock(&transfer_to
[cnt
]->dq_dqb_lock
);
1995 /* Decrease usage for source structures and update quota pointers */
1996 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1999 /* Due to IO error we might not have transfer_from[] structure */
2000 if (transfer_from
[cnt
]) {
2003 spin_lock(&transfer_from
[cnt
]->dq_dqb_lock
);
2004 wtype
= info_idq_free(transfer_from
[cnt
], inode_usage
);
2005 if (wtype
!= QUOTA_NL_NOWARN
)
2006 prepare_warning(&warn_from_inodes
[cnt
],
2007 transfer_from
[cnt
], wtype
);
2008 wtype
= info_bdq_free(transfer_from
[cnt
],
2009 cur_space
+ rsv_space
);
2010 if (wtype
!= QUOTA_NL_NOWARN
)
2011 prepare_warning(&warn_from_space
[cnt
],
2012 transfer_from
[cnt
], wtype
);
2013 dquot_decr_inodes(transfer_from
[cnt
], inode_usage
);
2014 dquot_decr_space(transfer_from
[cnt
], cur_space
);
2015 dquot_free_reserved_space(transfer_from
[cnt
],
2017 spin_unlock(&transfer_from
[cnt
]->dq_dqb_lock
);
2019 i_dquot(inode
)[cnt
] = transfer_to
[cnt
];
2021 spin_unlock(&inode
->i_lock
);
2022 spin_unlock(&dq_data_lock
);
2024 mark_all_dquot_dirty(transfer_from
);
2025 mark_all_dquot_dirty(transfer_to
);
2026 flush_warnings(warn_to
);
2027 flush_warnings(warn_from_inodes
);
2028 flush_warnings(warn_from_space
);
2029 /* Pass back references to put */
2030 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2032 transfer_to
[cnt
] = transfer_from
[cnt
];
2035 /* Back out changes we already did */
2036 for (cnt
--; cnt
>= 0; cnt
--) {
2039 spin_lock(&transfer_to
[cnt
]->dq_dqb_lock
);
2040 dquot_decr_inodes(transfer_to
[cnt
], inode_usage
);
2041 dquot_decr_space(transfer_to
[cnt
], cur_space
);
2042 dquot_free_reserved_space(transfer_to
[cnt
], rsv_space
);
2043 spin_unlock(&transfer_to
[cnt
]->dq_dqb_lock
);
2045 spin_unlock(&inode
->i_lock
);
2046 spin_unlock(&dq_data_lock
);
2047 flush_warnings(warn_to
);
2050 EXPORT_SYMBOL(__dquot_transfer
);
2052 /* Wrapper for transferring ownership of an inode for uid/gid only
2053 * Called from FSXXX_setattr()
2055 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
2057 struct dquot
*transfer_to
[MAXQUOTAS
] = {};
2058 struct dquot
*dquot
;
2059 struct super_block
*sb
= inode
->i_sb
;
2062 if (!dquot_active(inode
))
2065 if (iattr
->ia_valid
& ATTR_UID
&& !uid_eq(iattr
->ia_uid
, inode
->i_uid
)){
2066 dquot
= dqget(sb
, make_kqid_uid(iattr
->ia_uid
));
2067 if (IS_ERR(dquot
)) {
2068 if (PTR_ERR(dquot
) != -ESRCH
) {
2069 ret
= PTR_ERR(dquot
);
2074 transfer_to
[USRQUOTA
] = dquot
;
2076 if (iattr
->ia_valid
& ATTR_GID
&& !gid_eq(iattr
->ia_gid
, inode
->i_gid
)){
2077 dquot
= dqget(sb
, make_kqid_gid(iattr
->ia_gid
));
2078 if (IS_ERR(dquot
)) {
2079 if (PTR_ERR(dquot
) != -ESRCH
) {
2080 ret
= PTR_ERR(dquot
);
2085 transfer_to
[GRPQUOTA
] = dquot
;
2087 ret
= __dquot_transfer(inode
, transfer_to
);
2089 dqput_all(transfer_to
);
2092 EXPORT_SYMBOL(dquot_transfer
);
2095 * Write info of quota file to disk
2097 int dquot_commit_info(struct super_block
*sb
, int type
)
2099 struct quota_info
*dqopt
= sb_dqopt(sb
);
2101 return dqopt
->ops
[type
]->write_file_info(sb
, type
);
2103 EXPORT_SYMBOL(dquot_commit_info
);
2105 int dquot_get_next_id(struct super_block
*sb
, struct kqid
*qid
)
2107 struct quota_info
*dqopt
= sb_dqopt(sb
);
2109 if (!sb_has_quota_active(sb
, qid
->type
))
2111 if (!dqopt
->ops
[qid
->type
]->get_next_id
)
2113 return dqopt
->ops
[qid
->type
]->get_next_id(sb
, qid
);
2115 EXPORT_SYMBOL(dquot_get_next_id
);
2118 * Definitions of diskquota operations.
2120 const struct dquot_operations dquot_operations
= {
2121 .write_dquot
= dquot_commit
,
2122 .acquire_dquot
= dquot_acquire
,
2123 .release_dquot
= dquot_release
,
2124 .mark_dirty
= dquot_mark_dquot_dirty
,
2125 .write_info
= dquot_commit_info
,
2126 .alloc_dquot
= dquot_alloc
,
2127 .destroy_dquot
= dquot_destroy
,
2128 .get_next_id
= dquot_get_next_id
,
2130 EXPORT_SYMBOL(dquot_operations
);
2133 * Generic helper for ->open on filesystems supporting disk quotas.
2135 int dquot_file_open(struct inode
*inode
, struct file
*file
)
2139 error
= generic_file_open(inode
, file
);
2140 if (!error
&& (file
->f_mode
& FMODE_WRITE
))
2141 dquot_initialize(inode
);
2144 EXPORT_SYMBOL(dquot_file_open
);
2147 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
2149 int dquot_disable(struct super_block
*sb
, int type
, unsigned int flags
)
2152 struct quota_info
*dqopt
= sb_dqopt(sb
);
2153 struct inode
*toputinode
[MAXQUOTAS
];
2155 /* s_umount should be held in exclusive mode */
2156 if (WARN_ON_ONCE(down_read_trylock(&sb
->s_umount
)))
2157 up_read(&sb
->s_umount
);
2159 /* Cannot turn off usage accounting without turning off limits, or
2160 * suspend quotas and simultaneously turn quotas off. */
2161 if ((flags
& DQUOT_USAGE_ENABLED
&& !(flags
& DQUOT_LIMITS_ENABLED
))
2162 || (flags
& DQUOT_SUSPENDED
&& flags
& (DQUOT_LIMITS_ENABLED
|
2163 DQUOT_USAGE_ENABLED
)))
2167 * Skip everything if there's nothing to do. We have to do this because
2168 * sometimes we are called when fill_super() failed and calling
2169 * sync_fs() in such cases does no good.
2171 if (!sb_any_quota_loaded(sb
))
2174 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2175 toputinode
[cnt
] = NULL
;
2176 if (type
!= -1 && cnt
!= type
)
2178 if (!sb_has_quota_loaded(sb
, cnt
))
2181 if (flags
& DQUOT_SUSPENDED
) {
2182 spin_lock(&dq_state_lock
);
2184 dquot_state_flag(DQUOT_SUSPENDED
, cnt
);
2185 spin_unlock(&dq_state_lock
);
2187 spin_lock(&dq_state_lock
);
2188 dqopt
->flags
&= ~dquot_state_flag(flags
, cnt
);
2189 /* Turning off suspended quotas? */
2190 if (!sb_has_quota_loaded(sb
, cnt
) &&
2191 sb_has_quota_suspended(sb
, cnt
)) {
2192 dqopt
->flags
&= ~dquot_state_flag(
2193 DQUOT_SUSPENDED
, cnt
);
2194 spin_unlock(&dq_state_lock
);
2195 iput(dqopt
->files
[cnt
]);
2196 dqopt
->files
[cnt
] = NULL
;
2199 spin_unlock(&dq_state_lock
);
2202 /* We still have to keep quota loaded? */
2203 if (sb_has_quota_loaded(sb
, cnt
) && !(flags
& DQUOT_SUSPENDED
))
2206 /* Note: these are blocking operations */
2207 drop_dquot_ref(sb
, cnt
);
2208 invalidate_dquots(sb
, cnt
);
2210 * Now all dquots should be invalidated, all writes done so we
2211 * should be only users of the info. No locks needed.
2213 if (info_dirty(&dqopt
->info
[cnt
]))
2214 sb
->dq_op
->write_info(sb
, cnt
);
2215 if (dqopt
->ops
[cnt
]->free_file_info
)
2216 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
2217 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
2219 toputinode
[cnt
] = dqopt
->files
[cnt
];
2220 if (!sb_has_quota_loaded(sb
, cnt
))
2221 dqopt
->files
[cnt
] = NULL
;
2222 dqopt
->info
[cnt
].dqi_flags
= 0;
2223 dqopt
->info
[cnt
].dqi_igrace
= 0;
2224 dqopt
->info
[cnt
].dqi_bgrace
= 0;
2225 dqopt
->ops
[cnt
] = NULL
;
2228 /* Skip syncing and setting flags if quota files are hidden */
2229 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
2232 /* Sync the superblock so that buffers with quota data are written to
2233 * disk (and so userspace sees correct data afterwards). */
2234 if (sb
->s_op
->sync_fs
)
2235 sb
->s_op
->sync_fs(sb
, 1);
2236 sync_blockdev(sb
->s_bdev
);
2237 /* Now the quota files are just ordinary files and we can set the
2238 * inode flags back. Moreover we discard the pagecache so that
2239 * userspace sees the writes we did bypassing the pagecache. We
2240 * must also discard the blockdev buffers so that we see the
2241 * changes done by userspace on the next quotaon() */
2242 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2243 /* This can happen when suspending quotas on remount-ro... */
2244 if (toputinode
[cnt
] && !sb_has_quota_loaded(sb
, cnt
)) {
2245 inode_lock(toputinode
[cnt
]);
2246 toputinode
[cnt
]->i_flags
&= ~S_NOQUOTA
;
2247 truncate_inode_pages(&toputinode
[cnt
]->i_data
, 0);
2248 inode_unlock(toputinode
[cnt
]);
2249 mark_inode_dirty_sync(toputinode
[cnt
]);
2252 invalidate_bdev(sb
->s_bdev
);
2254 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2255 if (toputinode
[cnt
]) {
2256 /* On remount RO, we keep the inode pointer so that we
2257 * can reenable quota on the subsequent remount RW. We
2258 * have to check 'flags' variable and not use sb_has_
2259 * function because another quotaon / quotaoff could
2260 * change global state before we got here. We refuse
2261 * to suspend quotas when there is pending delete on
2262 * the quota file... */
2263 if (!(flags
& DQUOT_SUSPENDED
))
2264 iput(toputinode
[cnt
]);
2265 else if (!toputinode
[cnt
]->i_nlink
)
2270 EXPORT_SYMBOL(dquot_disable
);
2272 int dquot_quota_off(struct super_block
*sb
, int type
)
2274 return dquot_disable(sb
, type
,
2275 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2277 EXPORT_SYMBOL(dquot_quota_off
);
2280 * Turn quotas on on a device
2284 * Helper function to turn quotas on when we already have the inode of
2285 * quota file and no quota information is loaded.
2287 static int vfs_load_quota_inode(struct inode
*inode
, int type
, int format_id
,
2290 struct quota_format_type
*fmt
= find_quota_format(format_id
);
2291 struct super_block
*sb
= inode
->i_sb
;
2292 struct quota_info
*dqopt
= sb_dqopt(sb
);
2297 if (!S_ISREG(inode
->i_mode
)) {
2301 if (IS_RDONLY(inode
)) {
2305 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
||
2306 (type
== PRJQUOTA
&& sb
->dq_op
->get_projid
== NULL
)) {
2310 /* Filesystems outside of init_user_ns not yet supported */
2311 if (sb
->s_user_ns
!= &init_user_ns
) {
2315 /* Usage always has to be set... */
2316 if (!(flags
& DQUOT_USAGE_ENABLED
)) {
2320 if (sb_has_quota_loaded(sb
, type
)) {
2325 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2326 /* As we bypass the pagecache we must now flush all the
2327 * dirty data and invalidate caches so that kernel sees
2328 * changes from userspace. It is not enough to just flush
2329 * the quota file since if blocksize < pagesize, invalidation
2330 * of the cache could fail because of other unrelated dirty
2332 sync_filesystem(sb
);
2333 invalidate_bdev(sb
->s_bdev
);
2336 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2337 /* We don't want quota and atime on quota files (deadlocks
2338 * possible) Also nobody should write to the file - we use
2339 * special IO operations which ignore the immutable bit. */
2341 inode
->i_flags
|= S_NOQUOTA
;
2342 inode_unlock(inode
);
2344 * When S_NOQUOTA is set, remove dquot references as no more
2345 * references can be added
2347 __dquot_drop(inode
);
2351 dqopt
->files
[type
] = igrab(inode
);
2352 if (!dqopt
->files
[type
])
2353 goto out_file_flags
;
2355 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
2358 dqopt
->ops
[type
] = fmt
->qf_ops
;
2359 dqopt
->info
[type
].dqi_format
= fmt
;
2360 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
2361 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
2362 error
= dqopt
->ops
[type
]->read_file_info(sb
, type
);
2365 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
) {
2366 spin_lock(&dq_data_lock
);
2367 dqopt
->info
[type
].dqi_flags
|= DQF_SYS_FILE
;
2368 spin_unlock(&dq_data_lock
);
2370 spin_lock(&dq_state_lock
);
2371 dqopt
->flags
|= dquot_state_flag(flags
, type
);
2372 spin_unlock(&dq_state_lock
);
2374 add_dquot_ref(sb
, type
);
2379 dqopt
->files
[type
] = NULL
;
2383 inode
->i_flags
&= ~S_NOQUOTA
;
2384 inode_unlock(inode
);
2386 put_quota_format(fmt
);
2391 /* Reenable quotas on remount RW */
2392 int dquot_resume(struct super_block
*sb
, int type
)
2394 struct quota_info
*dqopt
= sb_dqopt(sb
);
2395 struct inode
*inode
;
2399 /* s_umount should be held in exclusive mode */
2400 if (WARN_ON_ONCE(down_read_trylock(&sb
->s_umount
)))
2401 up_read(&sb
->s_umount
);
2403 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2404 if (type
!= -1 && cnt
!= type
)
2406 if (!sb_has_quota_suspended(sb
, cnt
))
2409 inode
= dqopt
->files
[cnt
];
2410 dqopt
->files
[cnt
] = NULL
;
2411 spin_lock(&dq_state_lock
);
2412 flags
= dqopt
->flags
& dquot_state_flag(DQUOT_USAGE_ENABLED
|
2413 DQUOT_LIMITS_ENABLED
,
2415 dqopt
->flags
&= ~dquot_state_flag(DQUOT_STATE_FLAGS
, cnt
);
2416 spin_unlock(&dq_state_lock
);
2418 flags
= dquot_generic_flag(flags
, cnt
);
2419 ret
= vfs_load_quota_inode(inode
, cnt
,
2420 dqopt
->info
[cnt
].dqi_fmt_id
, flags
);
2426 EXPORT_SYMBOL(dquot_resume
);
2428 int dquot_quota_on(struct super_block
*sb
, int type
, int format_id
,
2429 const struct path
*path
)
2431 int error
= security_quota_on(path
->dentry
);
2434 /* Quota file not on the same filesystem? */
2435 if (path
->dentry
->d_sb
!= sb
)
2438 error
= vfs_load_quota_inode(d_inode(path
->dentry
), type
,
2439 format_id
, DQUOT_USAGE_ENABLED
|
2440 DQUOT_LIMITS_ENABLED
);
2443 EXPORT_SYMBOL(dquot_quota_on
);
2446 * More powerful function for turning on quotas allowing setting
2447 * of individual quota flags
2449 int dquot_enable(struct inode
*inode
, int type
, int format_id
,
2452 struct super_block
*sb
= inode
->i_sb
;
2454 /* Just unsuspend quotas? */
2455 BUG_ON(flags
& DQUOT_SUSPENDED
);
2456 /* s_umount should be held in exclusive mode */
2457 if (WARN_ON_ONCE(down_read_trylock(&sb
->s_umount
)))
2458 up_read(&sb
->s_umount
);
2462 /* Just updating flags needed? */
2463 if (sb_has_quota_loaded(sb
, type
)) {
2464 if (flags
& DQUOT_USAGE_ENABLED
&&
2465 sb_has_quota_usage_enabled(sb
, type
))
2467 if (flags
& DQUOT_LIMITS_ENABLED
&&
2468 sb_has_quota_limits_enabled(sb
, type
))
2470 spin_lock(&dq_state_lock
);
2471 sb_dqopt(sb
)->flags
|= dquot_state_flag(flags
, type
);
2472 spin_unlock(&dq_state_lock
);
2476 return vfs_load_quota_inode(inode
, type
, format_id
, flags
);
2478 EXPORT_SYMBOL(dquot_enable
);
2481 * This function is used when filesystem needs to initialize quotas
2482 * during mount time.
2484 int dquot_quota_on_mount(struct super_block
*sb
, char *qf_name
,
2485 int format_id
, int type
)
2487 struct dentry
*dentry
;
2490 dentry
= lookup_one_len_unlocked(qf_name
, sb
->s_root
, strlen(qf_name
));
2492 return PTR_ERR(dentry
);
2494 if (d_really_is_negative(dentry
)) {
2499 error
= security_quota_on(dentry
);
2501 error
= vfs_load_quota_inode(d_inode(dentry
), type
, format_id
,
2502 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2508 EXPORT_SYMBOL(dquot_quota_on_mount
);
2510 static int dquot_quota_enable(struct super_block
*sb
, unsigned int flags
)
2514 struct quota_info
*dqopt
= sb_dqopt(sb
);
2516 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
))
2518 /* Accounting cannot be turned on while fs is mounted */
2519 flags
&= ~(FS_QUOTA_UDQ_ACCT
| FS_QUOTA_GDQ_ACCT
| FS_QUOTA_PDQ_ACCT
);
2522 for (type
= 0; type
< MAXQUOTAS
; type
++) {
2523 if (!(flags
& qtype_enforce_flag(type
)))
2525 /* Can't enforce without accounting */
2526 if (!sb_has_quota_usage_enabled(sb
, type
))
2528 ret
= dquot_enable(dqopt
->files
[type
], type
,
2529 dqopt
->info
[type
].dqi_fmt_id
,
2530 DQUOT_LIMITS_ENABLED
);
2536 /* Backout enforcement enablement we already did */
2537 for (type
--; type
>= 0; type
--) {
2538 if (flags
& qtype_enforce_flag(type
))
2539 dquot_disable(sb
, type
, DQUOT_LIMITS_ENABLED
);
2541 /* Error code translation for better compatibility with XFS */
2547 static int dquot_quota_disable(struct super_block
*sb
, unsigned int flags
)
2551 struct quota_info
*dqopt
= sb_dqopt(sb
);
2553 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
))
2556 * We don't support turning off accounting via quotactl. In principle
2557 * quota infrastructure can do this but filesystems don't expect
2558 * userspace to be able to do it.
2561 (FS_QUOTA_UDQ_ACCT
| FS_QUOTA_GDQ_ACCT
| FS_QUOTA_PDQ_ACCT
))
2564 /* Filter out limits not enabled */
2565 for (type
= 0; type
< MAXQUOTAS
; type
++)
2566 if (!sb_has_quota_limits_enabled(sb
, type
))
2567 flags
&= ~qtype_enforce_flag(type
);
2571 for (type
= 0; type
< MAXQUOTAS
; type
++) {
2572 if (flags
& qtype_enforce_flag(type
)) {
2573 ret
= dquot_disable(sb
, type
, DQUOT_LIMITS_ENABLED
);
2580 /* Backout enforcement disabling we already did */
2581 for (type
--; type
>= 0; type
--) {
2582 if (flags
& qtype_enforce_flag(type
))
2583 dquot_enable(dqopt
->files
[type
], type
,
2584 dqopt
->info
[type
].dqi_fmt_id
,
2585 DQUOT_LIMITS_ENABLED
);
2590 /* Generic routine for getting common part of quota structure */
2591 static void do_get_dqblk(struct dquot
*dquot
, struct qc_dqblk
*di
)
2593 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2595 memset(di
, 0, sizeof(*di
));
2596 spin_lock(&dquot
->dq_dqb_lock
);
2597 di
->d_spc_hardlimit
= dm
->dqb_bhardlimit
;
2598 di
->d_spc_softlimit
= dm
->dqb_bsoftlimit
;
2599 di
->d_ino_hardlimit
= dm
->dqb_ihardlimit
;
2600 di
->d_ino_softlimit
= dm
->dqb_isoftlimit
;
2601 di
->d_space
= dm
->dqb_curspace
+ dm
->dqb_rsvspace
;
2602 di
->d_ino_count
= dm
->dqb_curinodes
;
2603 di
->d_spc_timer
= dm
->dqb_btime
;
2604 di
->d_ino_timer
= dm
->dqb_itime
;
2605 spin_unlock(&dquot
->dq_dqb_lock
);
2608 int dquot_get_dqblk(struct super_block
*sb
, struct kqid qid
,
2609 struct qc_dqblk
*di
)
2611 struct dquot
*dquot
;
2613 dquot
= dqget(sb
, qid
);
2615 return PTR_ERR(dquot
);
2616 do_get_dqblk(dquot
, di
);
2621 EXPORT_SYMBOL(dquot_get_dqblk
);
2623 int dquot_get_next_dqblk(struct super_block
*sb
, struct kqid
*qid
,
2624 struct qc_dqblk
*di
)
2626 struct dquot
*dquot
;
2629 if (!sb
->dq_op
->get_next_id
)
2631 err
= sb
->dq_op
->get_next_id(sb
, qid
);
2634 dquot
= dqget(sb
, *qid
);
2636 return PTR_ERR(dquot
);
2637 do_get_dqblk(dquot
, di
);
2642 EXPORT_SYMBOL(dquot_get_next_dqblk
);
2644 #define VFS_QC_MASK \
2645 (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \
2646 QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \
2647 QC_SPC_TIMER | QC_INO_TIMER)
2649 /* Generic routine for setting common part of quota structure */
2650 static int do_set_dqblk(struct dquot
*dquot
, struct qc_dqblk
*di
)
2652 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2653 int check_blim
= 0, check_ilim
= 0;
2654 struct mem_dqinfo
*dqi
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
];
2656 if (di
->d_fieldmask
& ~VFS_QC_MASK
)
2659 if (((di
->d_fieldmask
& QC_SPC_SOFT
) &&
2660 di
->d_spc_softlimit
> dqi
->dqi_max_spc_limit
) ||
2661 ((di
->d_fieldmask
& QC_SPC_HARD
) &&
2662 di
->d_spc_hardlimit
> dqi
->dqi_max_spc_limit
) ||
2663 ((di
->d_fieldmask
& QC_INO_SOFT
) &&
2664 (di
->d_ino_softlimit
> dqi
->dqi_max_ino_limit
)) ||
2665 ((di
->d_fieldmask
& QC_INO_HARD
) &&
2666 (di
->d_ino_hardlimit
> dqi
->dqi_max_ino_limit
)))
2669 spin_lock(&dquot
->dq_dqb_lock
);
2670 if (di
->d_fieldmask
& QC_SPACE
) {
2671 dm
->dqb_curspace
= di
->d_space
- dm
->dqb_rsvspace
;
2673 set_bit(DQ_LASTSET_B
+ QIF_SPACE_B
, &dquot
->dq_flags
);
2676 if (di
->d_fieldmask
& QC_SPC_SOFT
)
2677 dm
->dqb_bsoftlimit
= di
->d_spc_softlimit
;
2678 if (di
->d_fieldmask
& QC_SPC_HARD
)
2679 dm
->dqb_bhardlimit
= di
->d_spc_hardlimit
;
2680 if (di
->d_fieldmask
& (QC_SPC_SOFT
| QC_SPC_HARD
)) {
2682 set_bit(DQ_LASTSET_B
+ QIF_BLIMITS_B
, &dquot
->dq_flags
);
2685 if (di
->d_fieldmask
& QC_INO_COUNT
) {
2686 dm
->dqb_curinodes
= di
->d_ino_count
;
2688 set_bit(DQ_LASTSET_B
+ QIF_INODES_B
, &dquot
->dq_flags
);
2691 if (di
->d_fieldmask
& QC_INO_SOFT
)
2692 dm
->dqb_isoftlimit
= di
->d_ino_softlimit
;
2693 if (di
->d_fieldmask
& QC_INO_HARD
)
2694 dm
->dqb_ihardlimit
= di
->d_ino_hardlimit
;
2695 if (di
->d_fieldmask
& (QC_INO_SOFT
| QC_INO_HARD
)) {
2697 set_bit(DQ_LASTSET_B
+ QIF_ILIMITS_B
, &dquot
->dq_flags
);
2700 if (di
->d_fieldmask
& QC_SPC_TIMER
) {
2701 dm
->dqb_btime
= di
->d_spc_timer
;
2703 set_bit(DQ_LASTSET_B
+ QIF_BTIME_B
, &dquot
->dq_flags
);
2706 if (di
->d_fieldmask
& QC_INO_TIMER
) {
2707 dm
->dqb_itime
= di
->d_ino_timer
;
2709 set_bit(DQ_LASTSET_B
+ QIF_ITIME_B
, &dquot
->dq_flags
);
2713 if (!dm
->dqb_bsoftlimit
||
2714 dm
->dqb_curspace
+ dm
->dqb_rsvspace
< dm
->dqb_bsoftlimit
) {
2716 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
2717 } else if (!(di
->d_fieldmask
& QC_SPC_TIMER
))
2718 /* Set grace only if user hasn't provided his own... */
2719 dm
->dqb_btime
= ktime_get_real_seconds() + dqi
->dqi_bgrace
;
2722 if (!dm
->dqb_isoftlimit
||
2723 dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
2725 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
2726 } else if (!(di
->d_fieldmask
& QC_INO_TIMER
))
2727 /* Set grace only if user hasn't provided his own... */
2728 dm
->dqb_itime
= ktime_get_real_seconds() + dqi
->dqi_igrace
;
2730 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
||
2732 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2734 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2735 spin_unlock(&dquot
->dq_dqb_lock
);
2736 mark_dquot_dirty(dquot
);
2741 int dquot_set_dqblk(struct super_block
*sb
, struct kqid qid
,
2742 struct qc_dqblk
*di
)
2744 struct dquot
*dquot
;
2747 dquot
= dqget(sb
, qid
);
2748 if (IS_ERR(dquot
)) {
2749 rc
= PTR_ERR(dquot
);
2752 rc
= do_set_dqblk(dquot
, di
);
2757 EXPORT_SYMBOL(dquot_set_dqblk
);
2759 /* Generic routine for getting common part of quota file information */
2760 int dquot_get_state(struct super_block
*sb
, struct qc_state
*state
)
2762 struct mem_dqinfo
*mi
;
2763 struct qc_type_state
*tstate
;
2764 struct quota_info
*dqopt
= sb_dqopt(sb
);
2767 memset(state
, 0, sizeof(*state
));
2768 for (type
= 0; type
< MAXQUOTAS
; type
++) {
2769 if (!sb_has_quota_active(sb
, type
))
2771 tstate
= state
->s_state
+ type
;
2772 mi
= sb_dqopt(sb
)->info
+ type
;
2773 tstate
->flags
= QCI_ACCT_ENABLED
;
2774 spin_lock(&dq_data_lock
);
2775 if (mi
->dqi_flags
& DQF_SYS_FILE
)
2776 tstate
->flags
|= QCI_SYSFILE
;
2777 if (mi
->dqi_flags
& DQF_ROOT_SQUASH
)
2778 tstate
->flags
|= QCI_ROOT_SQUASH
;
2779 if (sb_has_quota_limits_enabled(sb
, type
))
2780 tstate
->flags
|= QCI_LIMITS_ENFORCED
;
2781 tstate
->spc_timelimit
= mi
->dqi_bgrace
;
2782 tstate
->ino_timelimit
= mi
->dqi_igrace
;
2783 tstate
->ino
= dqopt
->files
[type
]->i_ino
;
2784 tstate
->blocks
= dqopt
->files
[type
]->i_blocks
;
2785 tstate
->nextents
= 1; /* We don't know... */
2786 spin_unlock(&dq_data_lock
);
2790 EXPORT_SYMBOL(dquot_get_state
);
2792 /* Generic routine for setting common part of quota file information */
2793 int dquot_set_dqinfo(struct super_block
*sb
, int type
, struct qc_info
*ii
)
2795 struct mem_dqinfo
*mi
;
2798 if ((ii
->i_fieldmask
& QC_WARNS_MASK
) ||
2799 (ii
->i_fieldmask
& QC_RT_SPC_TIMER
))
2801 if (!sb_has_quota_active(sb
, type
))
2803 mi
= sb_dqopt(sb
)->info
+ type
;
2804 if (ii
->i_fieldmask
& QC_FLAGS
) {
2805 if ((ii
->i_flags
& QCI_ROOT_SQUASH
&&
2806 mi
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
))
2809 spin_lock(&dq_data_lock
);
2810 if (ii
->i_fieldmask
& QC_SPC_TIMER
)
2811 mi
->dqi_bgrace
= ii
->i_spc_timelimit
;
2812 if (ii
->i_fieldmask
& QC_INO_TIMER
)
2813 mi
->dqi_igrace
= ii
->i_ino_timelimit
;
2814 if (ii
->i_fieldmask
& QC_FLAGS
) {
2815 if (ii
->i_flags
& QCI_ROOT_SQUASH
)
2816 mi
->dqi_flags
|= DQF_ROOT_SQUASH
;
2818 mi
->dqi_flags
&= ~DQF_ROOT_SQUASH
;
2820 spin_unlock(&dq_data_lock
);
2821 mark_info_dirty(sb
, type
);
2822 /* Force write to disk */
2823 sb
->dq_op
->write_info(sb
, type
);
2826 EXPORT_SYMBOL(dquot_set_dqinfo
);
2828 const struct quotactl_ops dquot_quotactl_sysfile_ops
= {
2829 .quota_enable
= dquot_quota_enable
,
2830 .quota_disable
= dquot_quota_disable
,
2831 .quota_sync
= dquot_quota_sync
,
2832 .get_state
= dquot_get_state
,
2833 .set_info
= dquot_set_dqinfo
,
2834 .get_dqblk
= dquot_get_dqblk
,
2835 .get_nextdqblk
= dquot_get_next_dqblk
,
2836 .set_dqblk
= dquot_set_dqblk
2838 EXPORT_SYMBOL(dquot_quotactl_sysfile_ops
);
2840 static int do_proc_dqstats(struct ctl_table
*table
, int write
,
2841 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2843 unsigned int type
= (int *)table
->data
- dqstats
.stat
;
2845 /* Update global table */
2846 dqstats
.stat
[type
] =
2847 percpu_counter_sum_positive(&dqstats
.counter
[type
]);
2848 return proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
2851 static struct ctl_table fs_dqstats_table
[] = {
2853 .procname
= "lookups",
2854 .data
= &dqstats
.stat
[DQST_LOOKUPS
],
2855 .maxlen
= sizeof(int),
2857 .proc_handler
= do_proc_dqstats
,
2860 .procname
= "drops",
2861 .data
= &dqstats
.stat
[DQST_DROPS
],
2862 .maxlen
= sizeof(int),
2864 .proc_handler
= do_proc_dqstats
,
2867 .procname
= "reads",
2868 .data
= &dqstats
.stat
[DQST_READS
],
2869 .maxlen
= sizeof(int),
2871 .proc_handler
= do_proc_dqstats
,
2874 .procname
= "writes",
2875 .data
= &dqstats
.stat
[DQST_WRITES
],
2876 .maxlen
= sizeof(int),
2878 .proc_handler
= do_proc_dqstats
,
2881 .procname
= "cache_hits",
2882 .data
= &dqstats
.stat
[DQST_CACHE_HITS
],
2883 .maxlen
= sizeof(int),
2885 .proc_handler
= do_proc_dqstats
,
2888 .procname
= "allocated_dquots",
2889 .data
= &dqstats
.stat
[DQST_ALLOC_DQUOTS
],
2890 .maxlen
= sizeof(int),
2892 .proc_handler
= do_proc_dqstats
,
2895 .procname
= "free_dquots",
2896 .data
= &dqstats
.stat
[DQST_FREE_DQUOTS
],
2897 .maxlen
= sizeof(int),
2899 .proc_handler
= do_proc_dqstats
,
2902 .procname
= "syncs",
2903 .data
= &dqstats
.stat
[DQST_SYNCS
],
2904 .maxlen
= sizeof(int),
2906 .proc_handler
= do_proc_dqstats
,
2908 #ifdef CONFIG_PRINT_QUOTA_WARNING
2910 .procname
= "warnings",
2911 .data
= &flag_print_warnings
,
2912 .maxlen
= sizeof(int),
2914 .proc_handler
= proc_dointvec
,
2920 static struct ctl_table fs_table
[] = {
2922 .procname
= "quota",
2924 .child
= fs_dqstats_table
,
2929 static struct ctl_table sys_table
[] = {
2938 static int __init
dquot_init(void)
2941 unsigned long nr_hash
, order
;
2943 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2945 register_sysctl_table(sys_table
);
2947 dquot_cachep
= kmem_cache_create("dquot",
2948 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2949 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2950 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2954 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
2956 panic("Cannot create dquot hash table");
2958 for (i
= 0; i
< _DQST_DQSTAT_LAST
; i
++) {
2959 ret
= percpu_counter_init(&dqstats
.counter
[i
], 0, GFP_KERNEL
);
2961 panic("Cannot create dquot stat counters");
2964 /* Find power-of-two hlist_heads which can fit into allocation */
2965 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2969 } while (nr_hash
>> dq_hash_bits
);
2972 nr_hash
= 1UL << dq_hash_bits
;
2973 dq_hash_mask
= nr_hash
- 1;
2974 for (i
= 0; i
< nr_hash
; i
++)
2975 INIT_HLIST_HEAD(dquot_hash
+ i
);
2977 pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld,"
2978 " %ld bytes)\n", nr_hash
, order
, (PAGE_SIZE
<< order
));
2980 register_shrinker(&dqcache_shrinker
);
2984 fs_initcall(dquot_init
);