1 // SPDX-License-Identifier: GPL-2.0
3 * Implementation of the diskquota system for the LINUX operating system. QUOTA
4 * is implemented using the BSD system call interface as the means of
5 * communication with the user level. This file contains the generic routines
6 * called by the different filesystems on allocation of an inode or block.
7 * These routines take care of the administration needed to have a consistent
8 * diskquota tracking system. The ideas of both user and group quotas are based
9 * on the Melbourne quota system as used on BSD derived systems. The internal
10 * implementation is based on one of the several variants of the LINUX
11 * inode-subsystem with added complexity of the diskquota system.
13 * Author: Marco van Wieringen <mvw@planets.elm.net>
15 * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
17 * Revised list management to avoid races
18 * -- Bill Hawes, <whawes@star.net>, 9/98
20 * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
21 * As the consequence the locking was moved from dquot_decr_...(),
22 * dquot_incr_...() to calling functions.
23 * invalidate_dquots() now writes modified dquots.
24 * Serialized quota_off() and quota_on() for mount point.
25 * Fixed a few bugs in grow_dquots().
26 * Fixed deadlock in write_dquot() - we no longer account quotas on
28 * remove_dquot_ref() moved to inode.c - it now traverses through inodes
29 * add_dquot_ref() restarts after blocking
30 * Added check for bogus uid and fixed check for group in quotactl.
31 * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
33 * Used struct list_head instead of own list struct
34 * Invalidation of referenced dquots is no longer possible
35 * Improved free_dquots list management
36 * Quota and i_blocks are now updated in one place to avoid races
37 * Warnings are now delayed so we won't block in critical section
38 * Write updated not to require dquot lock
39 * Jan Kara, <jack@suse.cz>, 9/2000
41 * Added dynamic quota structure allocation
42 * Jan Kara <jack@suse.cz> 12/2000
44 * Rewritten quota interface. Implemented new quota format and
45 * formats registering.
46 * Jan Kara, <jack@suse.cz>, 2001,2002
49 * Jan Kara, <jack@suse.cz>, 10/2002
51 * Added journalled quota support, fix lock inversion problems
52 * Jan Kara, <jack@suse.cz>, 2003,2004
54 * (C) Copyright 1994 - 1997 Marco van Wieringen
57 #include <linux/errno.h>
58 #include <linux/kernel.h>
60 #include <linux/mount.h>
62 #include <linux/time.h>
63 #include <linux/types.h>
64 #include <linux/string.h>
65 #include <linux/fcntl.h>
66 #include <linux/stat.h>
67 #include <linux/tty.h>
68 #include <linux/file.h>
69 #include <linux/slab.h>
70 #include <linux/sysctl.h>
71 #include <linux/init.h>
72 #include <linux/module.h>
73 #include <linux/proc_fs.h>
74 #include <linux/security.h>
75 #include <linux/sched.h>
76 #include <linux/cred.h>
77 #include <linux/kmod.h>
78 #include <linux/namei.h>
79 #include <linux/capability.h>
80 #include <linux/quotaops.h>
81 #include "../internal.h" /* ugh */
83 #include <linux/uaccess.h>
86 * There are five quota SMP locks:
87 * * dq_list_lock protects all lists with quotas and quota formats.
88 * * dquot->dq_dqb_lock protects data from dq_dqb
89 * * inode->i_lock protects inode->i_blocks, i_bytes and also guards
90 * consistency of dquot->dq_dqb with inode->i_blocks, i_bytes so that
91 * dquot_transfer() can stabilize amount it transfers
92 * * dq_data_lock protects mem_dqinfo structures and modifications of dquot
93 * pointers in the inode
94 * * dq_state_lock protects modifications of quota state (on quotaon and
95 * quotaoff) and readers who care about latest values take it as well.
97 * The spinlock ordering is hence:
98 * dq_data_lock > dq_list_lock > i_lock > dquot->dq_dqb_lock,
99 * dq_list_lock > dq_state_lock
101 * Note that some things (eg. sb pointer, type, id) doesn't change during
102 * the life of the dquot structure and so needn't to be protected by a lock
104 * Operation accessing dquots via inode pointers are protected by dquot_srcu.
105 * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and
106 * synchronize_srcu(&dquot_srcu) is called after clearing pointers from
107 * inode and before dropping dquot references to avoid use of dquots after
108 * they are freed. dq_data_lock is used to serialize the pointer setting and
109 * clearing operations.
110 * Special care needs to be taken about S_NOQUOTA inode flag (marking that
111 * inode is a quota file). Functions adding pointers from inode to dquots have
112 * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they
113 * have to do all pointer modifications before dropping dq_data_lock. This makes
114 * sure they cannot race with quotaon which first sets S_NOQUOTA flag and
115 * then drops all pointers to dquots from an inode.
117 * Each dquot has its dq_lock mutex. Dquot is locked when it is being read to
118 * memory (or space for it is being allocated) on the first dqget(), when it is
119 * being written out, and when it is being released on the last dqput(). The
120 * allocation and release operations are serialized by the dq_lock and by
121 * checking the use count in dquot_release().
123 * Lock ordering (including related VFS locks) is the following:
124 * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem
127 static __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_list_lock
);
128 static __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_state_lock
);
129 __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_data_lock
);
130 EXPORT_SYMBOL(dq_data_lock
);
131 DEFINE_STATIC_SRCU(dquot_srcu
);
133 static DECLARE_WAIT_QUEUE_HEAD(dquot_ref_wq
);
135 void __quota_error(struct super_block
*sb
, const char *func
,
136 const char *fmt
, ...)
138 if (printk_ratelimit()) {
140 struct va_format vaf
;
147 printk(KERN_ERR
"Quota error (device %s): %s: %pV\n",
148 sb
->s_id
, func
, &vaf
);
153 EXPORT_SYMBOL(__quota_error
);
155 #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING)
156 static char *quotatypes
[] = INITQFNAMES
;
158 static struct quota_format_type
*quota_formats
; /* List of registered formats */
159 static struct quota_module_name module_names
[] = INIT_QUOTA_MODULE_NAMES
;
161 /* SLAB cache for dquot structures */
162 static struct kmem_cache
*dquot_cachep
;
164 int register_quota_format(struct quota_format_type
*fmt
)
166 spin_lock(&dq_list_lock
);
167 fmt
->qf_next
= quota_formats
;
169 spin_unlock(&dq_list_lock
);
172 EXPORT_SYMBOL(register_quota_format
);
174 void unregister_quota_format(struct quota_format_type
*fmt
)
176 struct quota_format_type
**actqf
;
178 spin_lock(&dq_list_lock
);
179 for (actqf
= "a_formats
; *actqf
&& *actqf
!= fmt
;
180 actqf
= &(*actqf
)->qf_next
)
183 *actqf
= (*actqf
)->qf_next
;
184 spin_unlock(&dq_list_lock
);
186 EXPORT_SYMBOL(unregister_quota_format
);
188 static struct quota_format_type
*find_quota_format(int id
)
190 struct quota_format_type
*actqf
;
192 spin_lock(&dq_list_lock
);
193 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
194 actqf
= actqf
->qf_next
)
196 if (!actqf
|| !try_module_get(actqf
->qf_owner
)) {
199 spin_unlock(&dq_list_lock
);
201 for (qm
= 0; module_names
[qm
].qm_fmt_id
&&
202 module_names
[qm
].qm_fmt_id
!= id
; qm
++)
204 if (!module_names
[qm
].qm_fmt_id
||
205 request_module(module_names
[qm
].qm_mod_name
))
208 spin_lock(&dq_list_lock
);
209 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
210 actqf
= actqf
->qf_next
)
212 if (actqf
&& !try_module_get(actqf
->qf_owner
))
215 spin_unlock(&dq_list_lock
);
219 static void put_quota_format(struct quota_format_type
*fmt
)
221 module_put(fmt
->qf_owner
);
225 * Dquot List Management:
226 * The quota code uses three lists for dquot management: the inuse_list,
227 * free_dquots, and dquot_hash[] array. A single dquot structure may be
228 * on all three lists, depending on its current state.
230 * All dquots are placed to the end of inuse_list when first created, and this
231 * list is used for invalidate operation, which must look at every dquot.
233 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
234 * and this list is searched whenever we need an available dquot. Dquots are
235 * removed from the list as soon as they are used again, and
236 * dqstats.free_dquots gives the number of dquots on the list. When
237 * dquot is invalidated it's completely released from memory.
239 * Dquots with a specific identity (device, type and id) are placed on
240 * one of the dquot_hash[] hash chains. The provides an efficient search
241 * mechanism to locate a specific dquot.
244 static LIST_HEAD(inuse_list
);
245 static LIST_HEAD(free_dquots
);
246 static unsigned int dq_hash_bits
, dq_hash_mask
;
247 static struct hlist_head
*dquot_hash
;
249 struct dqstats dqstats
;
250 EXPORT_SYMBOL(dqstats
);
252 static qsize_t
inode_get_rsv_space(struct inode
*inode
);
253 static qsize_t
__inode_get_rsv_space(struct inode
*inode
);
254 static int __dquot_initialize(struct inode
*inode
, int type
);
256 static inline unsigned int
257 hashfn(const struct super_block
*sb
, struct kqid qid
)
259 unsigned int id
= from_kqid(&init_user_ns
, qid
);
263 tmp
= (((unsigned long)sb
>>L1_CACHE_SHIFT
) ^ id
) * (MAXQUOTAS
- type
);
264 return (tmp
+ (tmp
>> dq_hash_bits
)) & dq_hash_mask
;
268 * Following list functions expect dq_list_lock to be held
270 static inline void insert_dquot_hash(struct dquot
*dquot
)
272 struct hlist_head
*head
;
273 head
= dquot_hash
+ hashfn(dquot
->dq_sb
, dquot
->dq_id
);
274 hlist_add_head(&dquot
->dq_hash
, head
);
277 static inline void remove_dquot_hash(struct dquot
*dquot
)
279 hlist_del_init(&dquot
->dq_hash
);
282 static struct dquot
*find_dquot(unsigned int hashent
, struct super_block
*sb
,
285 struct hlist_node
*node
;
288 hlist_for_each (node
, dquot_hash
+hashent
) {
289 dquot
= hlist_entry(node
, struct dquot
, dq_hash
);
290 if (dquot
->dq_sb
== sb
&& qid_eq(dquot
->dq_id
, qid
))
296 /* Add a dquot to the tail of the free list */
297 static inline void put_dquot_last(struct dquot
*dquot
)
299 list_add_tail(&dquot
->dq_free
, &free_dquots
);
300 dqstats_inc(DQST_FREE_DQUOTS
);
303 static inline void remove_free_dquot(struct dquot
*dquot
)
305 if (list_empty(&dquot
->dq_free
))
307 list_del_init(&dquot
->dq_free
);
308 dqstats_dec(DQST_FREE_DQUOTS
);
311 static inline void put_inuse(struct dquot
*dquot
)
313 /* We add to the back of inuse list so we don't have to restart
314 * when traversing this list and we block */
315 list_add_tail(&dquot
->dq_inuse
, &inuse_list
);
316 dqstats_inc(DQST_ALLOC_DQUOTS
);
319 static inline void remove_inuse(struct dquot
*dquot
)
321 dqstats_dec(DQST_ALLOC_DQUOTS
);
322 list_del(&dquot
->dq_inuse
);
325 * End of list functions needing dq_list_lock
328 static void wait_on_dquot(struct dquot
*dquot
)
330 mutex_lock(&dquot
->dq_lock
);
331 mutex_unlock(&dquot
->dq_lock
);
334 static inline int dquot_dirty(struct dquot
*dquot
)
336 return test_bit(DQ_MOD_B
, &dquot
->dq_flags
);
339 static inline int mark_dquot_dirty(struct dquot
*dquot
)
341 return dquot
->dq_sb
->dq_op
->mark_dirty(dquot
);
344 /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */
345 int dquot_mark_dquot_dirty(struct dquot
*dquot
)
349 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
352 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NOLIST_DIRTY
)
353 return test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
);
355 /* If quota is dirty already, we don't have to acquire dq_list_lock */
356 if (test_bit(DQ_MOD_B
, &dquot
->dq_flags
))
359 spin_lock(&dq_list_lock
);
360 if (!test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
)) {
361 list_add(&dquot
->dq_dirty
, &sb_dqopt(dquot
->dq_sb
)->
362 info
[dquot
->dq_id
.type
].dqi_dirty_list
);
365 spin_unlock(&dq_list_lock
);
368 EXPORT_SYMBOL(dquot_mark_dquot_dirty
);
370 /* Dirtify all the dquots - this can block when journalling */
371 static inline int mark_all_dquot_dirty(struct dquot
* const *dquot
)
376 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
378 /* Even in case of error we have to continue */
379 ret
= mark_dquot_dirty(dquot
[cnt
]);
386 static inline void dqput_all(struct dquot
**dquot
)
390 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
394 static inline int clear_dquot_dirty(struct dquot
*dquot
)
396 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NOLIST_DIRTY
)
397 return test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
);
399 spin_lock(&dq_list_lock
);
400 if (!test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
)) {
401 spin_unlock(&dq_list_lock
);
404 list_del_init(&dquot
->dq_dirty
);
405 spin_unlock(&dq_list_lock
);
409 void mark_info_dirty(struct super_block
*sb
, int type
)
411 spin_lock(&dq_data_lock
);
412 sb_dqopt(sb
)->info
[type
].dqi_flags
|= DQF_INFO_DIRTY
;
413 spin_unlock(&dq_data_lock
);
415 EXPORT_SYMBOL(mark_info_dirty
);
418 * Read dquot from disk and alloc space for it
421 int dquot_acquire(struct dquot
*dquot
)
423 int ret
= 0, ret2
= 0;
424 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
426 mutex_lock(&dquot
->dq_lock
);
427 if (!test_bit(DQ_READ_B
, &dquot
->dq_flags
))
428 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->read_dqblk(dquot
);
431 /* Make sure flags update is visible after dquot has been filled */
432 smp_mb__before_atomic();
433 set_bit(DQ_READ_B
, &dquot
->dq_flags
);
434 /* Instantiate dquot if needed */
435 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && !dquot
->dq_off
) {
436 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->commit_dqblk(dquot
);
437 /* Write the info if needed */
438 if (info_dirty(&dqopt
->info
[dquot
->dq_id
.type
])) {
439 ret2
= dqopt
->ops
[dquot
->dq_id
.type
]->write_file_info(
440 dquot
->dq_sb
, dquot
->dq_id
.type
);
450 * Make sure flags update is visible after on-disk struct has been
451 * allocated. Paired with smp_rmb() in dqget().
453 smp_mb__before_atomic();
454 set_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
456 mutex_unlock(&dquot
->dq_lock
);
459 EXPORT_SYMBOL(dquot_acquire
);
462 * Write dquot to disk
464 int dquot_commit(struct dquot
*dquot
)
467 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
469 mutex_lock(&dquot
->dq_lock
);
470 if (!clear_dquot_dirty(dquot
))
472 /* Inactive dquot can be only if there was error during read/init
473 * => we have better not writing it */
474 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
475 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->commit_dqblk(dquot
);
479 mutex_unlock(&dquot
->dq_lock
);
482 EXPORT_SYMBOL(dquot_commit
);
487 int dquot_release(struct dquot
*dquot
)
489 int ret
= 0, ret2
= 0;
490 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
492 mutex_lock(&dquot
->dq_lock
);
493 /* Check whether we are not racing with some other dqget() */
494 if (atomic_read(&dquot
->dq_count
) > 1)
496 if (dqopt
->ops
[dquot
->dq_id
.type
]->release_dqblk
) {
497 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->release_dqblk(dquot
);
499 if (info_dirty(&dqopt
->info
[dquot
->dq_id
.type
])) {
500 ret2
= dqopt
->ops
[dquot
->dq_id
.type
]->write_file_info(
501 dquot
->dq_sb
, dquot
->dq_id
.type
);
506 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
508 mutex_unlock(&dquot
->dq_lock
);
511 EXPORT_SYMBOL(dquot_release
);
513 void dquot_destroy(struct dquot
*dquot
)
515 kmem_cache_free(dquot_cachep
, dquot
);
517 EXPORT_SYMBOL(dquot_destroy
);
519 static inline void do_destroy_dquot(struct dquot
*dquot
)
521 dquot
->dq_sb
->dq_op
->destroy_dquot(dquot
);
524 /* Invalidate all dquots on the list. Note that this function is called after
525 * quota is disabled and pointers from inodes removed so there cannot be new
526 * quota users. There can still be some users of quotas due to inodes being
527 * just deleted or pruned by prune_icache() (those are not attached to any
528 * list) or parallel quotactl call. We have to wait for such users.
530 static void invalidate_dquots(struct super_block
*sb
, int type
)
532 struct dquot
*dquot
, *tmp
;
535 spin_lock(&dq_list_lock
);
536 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
537 if (dquot
->dq_sb
!= sb
)
539 if (dquot
->dq_id
.type
!= type
)
541 /* Wait for dquot users */
542 if (atomic_read(&dquot
->dq_count
)) {
544 spin_unlock(&dq_list_lock
);
546 * Once dqput() wakes us up, we know it's time to free
548 * IMPORTANT: we rely on the fact that there is always
549 * at most one process waiting for dquot to free.
550 * Otherwise dq_count would be > 1 and we would never
553 wait_event(dquot_ref_wq
,
554 atomic_read(&dquot
->dq_count
) == 1);
556 /* At this moment dquot() need not exist (it could be
557 * reclaimed by prune_dqcache(). Hence we must
562 * Quota now has no users and it has been written on last
565 remove_dquot_hash(dquot
);
566 remove_free_dquot(dquot
);
568 do_destroy_dquot(dquot
);
570 spin_unlock(&dq_list_lock
);
573 /* Call callback for every active dquot on given filesystem */
574 int dquot_scan_active(struct super_block
*sb
,
575 int (*fn
)(struct dquot
*dquot
, unsigned long priv
),
578 struct dquot
*dquot
, *old_dquot
= NULL
;
581 WARN_ON_ONCE(!rwsem_is_locked(&sb
->s_umount
));
583 spin_lock(&dq_list_lock
);
584 list_for_each_entry(dquot
, &inuse_list
, dq_inuse
) {
585 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
587 if (dquot
->dq_sb
!= sb
)
589 /* Now we have active dquot so we can just increase use count */
590 atomic_inc(&dquot
->dq_count
);
591 spin_unlock(&dq_list_lock
);
592 dqstats_inc(DQST_LOOKUPS
);
596 * ->release_dquot() can be racing with us. Our reference
597 * protects us from new calls to it so just wait for any
598 * outstanding call and recheck the DQ_ACTIVE_B after that.
600 wait_on_dquot(dquot
);
601 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
602 ret
= fn(dquot
, priv
);
606 spin_lock(&dq_list_lock
);
607 /* We are safe to continue now because our dquot could not
608 * be moved out of the inuse list while we hold the reference */
610 spin_unlock(&dq_list_lock
);
615 EXPORT_SYMBOL(dquot_scan_active
);
617 /* Write all dquot structures to quota files */
618 int dquot_writeback_dquots(struct super_block
*sb
, int type
)
620 struct list_head
*dirty
;
622 struct quota_info
*dqopt
= sb_dqopt(sb
);
626 WARN_ON_ONCE(!rwsem_is_locked(&sb
->s_umount
));
628 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
629 if (type
!= -1 && cnt
!= type
)
631 if (!sb_has_quota_active(sb
, cnt
))
633 spin_lock(&dq_list_lock
);
634 dirty
= &dqopt
->info
[cnt
].dqi_dirty_list
;
635 while (!list_empty(dirty
)) {
636 dquot
= list_first_entry(dirty
, struct dquot
,
639 WARN_ON(!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
));
641 /* Now we have active dquot from which someone is
642 * holding reference so we can safely just increase
645 spin_unlock(&dq_list_lock
);
646 dqstats_inc(DQST_LOOKUPS
);
647 err
= sb
->dq_op
->write_dquot(dquot
);
651 spin_lock(&dq_list_lock
);
653 spin_unlock(&dq_list_lock
);
656 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
657 if ((cnt
== type
|| type
== -1) && sb_has_quota_active(sb
, cnt
)
658 && info_dirty(&dqopt
->info
[cnt
]))
659 sb
->dq_op
->write_info(sb
, cnt
);
660 dqstats_inc(DQST_SYNCS
);
664 EXPORT_SYMBOL(dquot_writeback_dquots
);
666 /* Write all dquot structures to disk and make them visible from userspace */
667 int dquot_quota_sync(struct super_block
*sb
, int type
)
669 struct quota_info
*dqopt
= sb_dqopt(sb
);
673 ret
= dquot_writeback_dquots(sb
, type
);
676 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
679 /* This is not very clever (and fast) but currently I don't know about
680 * any other simple way of getting quota data to disk and we must get
681 * them there for userspace to be visible... */
682 if (sb
->s_op
->sync_fs
)
683 sb
->s_op
->sync_fs(sb
, 1);
684 sync_blockdev(sb
->s_bdev
);
687 * Now when everything is written we can discard the pagecache so
688 * that userspace sees the changes.
690 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
691 if (type
!= -1 && cnt
!= type
)
693 if (!sb_has_quota_active(sb
, cnt
))
695 inode_lock(dqopt
->files
[cnt
]);
696 truncate_inode_pages(&dqopt
->files
[cnt
]->i_data
, 0);
697 inode_unlock(dqopt
->files
[cnt
]);
702 EXPORT_SYMBOL(dquot_quota_sync
);
705 dqcache_shrink_scan(struct shrinker
*shrink
, struct shrink_control
*sc
)
707 struct list_head
*head
;
709 unsigned long freed
= 0;
711 spin_lock(&dq_list_lock
);
712 head
= free_dquots
.prev
;
713 while (head
!= &free_dquots
&& sc
->nr_to_scan
) {
714 dquot
= list_entry(head
, struct dquot
, dq_free
);
715 remove_dquot_hash(dquot
);
716 remove_free_dquot(dquot
);
718 do_destroy_dquot(dquot
);
721 head
= free_dquots
.prev
;
723 spin_unlock(&dq_list_lock
);
728 dqcache_shrink_count(struct shrinker
*shrink
, struct shrink_control
*sc
)
730 return vfs_pressure_ratio(
731 percpu_counter_read_positive(&dqstats
.counter
[DQST_FREE_DQUOTS
]));
734 static struct shrinker dqcache_shrinker
= {
735 .count_objects
= dqcache_shrink_count
,
736 .scan_objects
= dqcache_shrink_scan
,
737 .seeks
= DEFAULT_SEEKS
,
741 * Put reference to dquot
743 void dqput(struct dquot
*dquot
)
749 #ifdef CONFIG_QUOTA_DEBUG
750 if (!atomic_read(&dquot
->dq_count
)) {
751 quota_error(dquot
->dq_sb
, "trying to free free dquot of %s %d",
752 quotatypes
[dquot
->dq_id
.type
],
753 from_kqid(&init_user_ns
, dquot
->dq_id
));
757 dqstats_inc(DQST_DROPS
);
759 spin_lock(&dq_list_lock
);
760 if (atomic_read(&dquot
->dq_count
) > 1) {
761 /* We have more than one user... nothing to do */
762 atomic_dec(&dquot
->dq_count
);
763 /* Releasing dquot during quotaoff phase? */
764 if (!sb_has_quota_active(dquot
->dq_sb
, dquot
->dq_id
.type
) &&
765 atomic_read(&dquot
->dq_count
) == 1)
766 wake_up(&dquot_ref_wq
);
767 spin_unlock(&dq_list_lock
);
770 /* Need to release dquot? */
771 if (dquot_dirty(dquot
)) {
772 spin_unlock(&dq_list_lock
);
773 /* Commit dquot before releasing */
774 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
776 quota_error(dquot
->dq_sb
, "Can't write quota structure"
777 " (error %d). Quota may get out of sync!",
780 * We clear dirty bit anyway, so that we avoid
783 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
);
822 dquot
->dq_id
= make_kqid_invalid(type
);
823 atomic_set(&dquot
->dq_count
, 1);
824 spin_lock_init(&dquot
->dq_dqb_lock
);
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
);
1083 void dquot_free_reserved_space(struct dquot
*dquot
, qsize_t number
)
1085 if (dquot
->dq_dqb
.dqb_rsvspace
>= number
)
1086 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1089 dquot
->dq_dqb
.dqb_rsvspace
= 0;
1091 if (dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
<=
1092 dquot
->dq_dqb
.dqb_bsoftlimit
)
1093 dquot
->dq_dqb
.dqb_btime
= (time64_t
) 0;
1094 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1097 static void dquot_decr_inodes(struct dquot
*dquot
, qsize_t number
)
1099 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1100 dquot
->dq_dqb
.dqb_curinodes
>= number
)
1101 dquot
->dq_dqb
.dqb_curinodes
-= number
;
1103 dquot
->dq_dqb
.dqb_curinodes
= 0;
1104 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1105 dquot
->dq_dqb
.dqb_itime
= (time64_t
) 0;
1106 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
1109 static void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
1111 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1112 dquot
->dq_dqb
.dqb_curspace
>= number
)
1113 dquot
->dq_dqb
.dqb_curspace
-= number
;
1115 dquot
->dq_dqb
.dqb_curspace
= 0;
1116 if (dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
<=
1117 dquot
->dq_dqb
.dqb_bsoftlimit
)
1118 dquot
->dq_dqb
.dqb_btime
= (time64_t
) 0;
1119 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1123 struct super_block
*w_sb
;
1124 struct kqid w_dq_id
;
1128 static int warning_issued(struct dquot
*dquot
, const int warntype
)
1130 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
1131 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
1132 ((warntype
== QUOTA_NL_IHARDWARN
||
1133 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
1137 return test_and_set_bit(flag
, &dquot
->dq_flags
);
1140 #ifdef CONFIG_PRINT_QUOTA_WARNING
1141 static int flag_print_warnings
= 1;
1143 static int need_print_warning(struct dquot_warn
*warn
)
1145 if (!flag_print_warnings
)
1148 switch (warn
->w_dq_id
.type
) {
1150 return uid_eq(current_fsuid(), warn
->w_dq_id
.uid
);
1152 return in_group_p(warn
->w_dq_id
.gid
);
1159 /* Print warning to user which exceeded quota */
1160 static void print_warning(struct dquot_warn
*warn
)
1163 struct tty_struct
*tty
;
1164 int warntype
= warn
->w_type
;
1166 if (warntype
== QUOTA_NL_IHARDBELOW
||
1167 warntype
== QUOTA_NL_ISOFTBELOW
||
1168 warntype
== QUOTA_NL_BHARDBELOW
||
1169 warntype
== QUOTA_NL_BSOFTBELOW
|| !need_print_warning(warn
))
1172 tty
= get_current_tty();
1175 tty_write_message(tty
, warn
->w_sb
->s_id
);
1176 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
1177 tty_write_message(tty
, ": warning, ");
1179 tty_write_message(tty
, ": write failed, ");
1180 tty_write_message(tty
, quotatypes
[warn
->w_dq_id
.type
]);
1182 case QUOTA_NL_IHARDWARN
:
1183 msg
= " file limit reached.\r\n";
1185 case QUOTA_NL_ISOFTLONGWARN
:
1186 msg
= " file quota exceeded too long.\r\n";
1188 case QUOTA_NL_ISOFTWARN
:
1189 msg
= " file quota exceeded.\r\n";
1191 case QUOTA_NL_BHARDWARN
:
1192 msg
= " block limit reached.\r\n";
1194 case QUOTA_NL_BSOFTLONGWARN
:
1195 msg
= " block quota exceeded too long.\r\n";
1197 case QUOTA_NL_BSOFTWARN
:
1198 msg
= " block quota exceeded.\r\n";
1201 tty_write_message(tty
, msg
);
1206 static void prepare_warning(struct dquot_warn
*warn
, struct dquot
*dquot
,
1209 if (warning_issued(dquot
, warntype
))
1211 warn
->w_type
= warntype
;
1212 warn
->w_sb
= dquot
->dq_sb
;
1213 warn
->w_dq_id
= dquot
->dq_id
;
1217 * Write warnings to the console and send warning messages over netlink.
1219 * Note that this function can call into tty and networking code.
1221 static void flush_warnings(struct dquot_warn
*warn
)
1225 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1226 if (warn
[i
].w_type
== QUOTA_NL_NOWARN
)
1228 #ifdef CONFIG_PRINT_QUOTA_WARNING
1229 print_warning(&warn
[i
]);
1231 quota_send_warning(warn
[i
].w_dq_id
,
1232 warn
[i
].w_sb
->s_dev
, warn
[i
].w_type
);
1236 static int ignore_hardlimit(struct dquot
*dquot
)
1238 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
];
1240 return capable(CAP_SYS_RESOURCE
) &&
1241 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
||
1242 !(info
->dqi_flags
& DQF_ROOT_SQUASH
));
1245 static int dquot_add_inodes(struct dquot
*dquot
, qsize_t inodes
,
1246 struct dquot_warn
*warn
)
1251 spin_lock(&dquot
->dq_dqb_lock
);
1252 newinodes
= dquot
->dq_dqb
.dqb_curinodes
+ inodes
;
1253 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_id
.type
) ||
1254 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1257 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1258 newinodes
> dquot
->dq_dqb
.dqb_ihardlimit
&&
1259 !ignore_hardlimit(dquot
)) {
1260 prepare_warning(warn
, dquot
, QUOTA_NL_IHARDWARN
);
1265 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1266 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1267 dquot
->dq_dqb
.dqb_itime
&&
1268 ktime_get_real_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1269 !ignore_hardlimit(dquot
)) {
1270 prepare_warning(warn
, dquot
, QUOTA_NL_ISOFTLONGWARN
);
1275 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1276 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1277 dquot
->dq_dqb
.dqb_itime
== 0) {
1278 prepare_warning(warn
, dquot
, QUOTA_NL_ISOFTWARN
);
1279 dquot
->dq_dqb
.dqb_itime
= ktime_get_real_seconds() +
1280 sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
].dqi_igrace
;
1283 dquot
->dq_dqb
.dqb_curinodes
= newinodes
;
1286 spin_unlock(&dquot
->dq_dqb_lock
);
1290 static int dquot_add_space(struct dquot
*dquot
, qsize_t space
,
1291 qsize_t rsv_space
, unsigned int flags
,
1292 struct dquot_warn
*warn
)
1295 struct super_block
*sb
= dquot
->dq_sb
;
1298 spin_lock(&dquot
->dq_dqb_lock
);
1299 if (!sb_has_quota_limits_enabled(sb
, dquot
->dq_id
.type
) ||
1300 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1303 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
1304 + space
+ rsv_space
;
1306 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1307 tspace
> dquot
->dq_dqb
.dqb_bhardlimit
&&
1308 !ignore_hardlimit(dquot
)) {
1309 if (flags
& DQUOT_SPACE_WARN
)
1310 prepare_warning(warn
, dquot
, QUOTA_NL_BHARDWARN
);
1315 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1316 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1317 dquot
->dq_dqb
.dqb_btime
&&
1318 ktime_get_real_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1319 !ignore_hardlimit(dquot
)) {
1320 if (flags
& DQUOT_SPACE_WARN
)
1321 prepare_warning(warn
, dquot
, QUOTA_NL_BSOFTLONGWARN
);
1326 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1327 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1328 dquot
->dq_dqb
.dqb_btime
== 0) {
1329 if (flags
& DQUOT_SPACE_WARN
) {
1330 prepare_warning(warn
, dquot
, QUOTA_NL_BSOFTWARN
);
1331 dquot
->dq_dqb
.dqb_btime
= ktime_get_real_seconds() +
1332 sb_dqopt(sb
)->info
[dquot
->dq_id
.type
].dqi_bgrace
;
1335 * We don't allow preallocation to exceed softlimit so exceeding will
1344 * We have to be careful and go through warning generation & grace time
1345 * setting even if DQUOT_SPACE_NOFAIL is set. That's why we check it
1348 if (flags
& DQUOT_SPACE_NOFAIL
)
1351 dquot
->dq_dqb
.dqb_rsvspace
+= rsv_space
;
1352 dquot
->dq_dqb
.dqb_curspace
+= space
;
1354 spin_unlock(&dquot
->dq_dqb_lock
);
1358 static int info_idq_free(struct dquot
*dquot
, qsize_t inodes
)
1362 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1363 dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
||
1364 !sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_id
.type
))
1365 return QUOTA_NL_NOWARN
;
1367 newinodes
= dquot
->dq_dqb
.dqb_curinodes
- inodes
;
1368 if (newinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1369 return QUOTA_NL_ISOFTBELOW
;
1370 if (dquot
->dq_dqb
.dqb_curinodes
>= dquot
->dq_dqb
.dqb_ihardlimit
&&
1371 newinodes
< dquot
->dq_dqb
.dqb_ihardlimit
)
1372 return QUOTA_NL_IHARDBELOW
;
1373 return QUOTA_NL_NOWARN
;
1376 static int info_bdq_free(struct dquot
*dquot
, qsize_t space
)
1380 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
;
1382 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1383 tspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1384 return QUOTA_NL_NOWARN
;
1386 if (tspace
- space
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1387 return QUOTA_NL_BSOFTBELOW
;
1388 if (tspace
>= dquot
->dq_dqb
.dqb_bhardlimit
&&
1389 tspace
- space
< dquot
->dq_dqb
.dqb_bhardlimit
)
1390 return QUOTA_NL_BHARDBELOW
;
1391 return QUOTA_NL_NOWARN
;
1394 static int dquot_active(const struct inode
*inode
)
1396 struct super_block
*sb
= inode
->i_sb
;
1398 if (IS_NOQUOTA(inode
))
1400 return sb_any_quota_loaded(sb
) & ~sb_any_quota_suspended(sb
);
1404 * Initialize quota pointers in inode
1406 * It is better to call this function outside of any transaction as it
1407 * might need a lot of space in journal for dquot structure allocation.
1409 static int __dquot_initialize(struct inode
*inode
, int type
)
1411 int cnt
, init_needed
= 0;
1412 struct dquot
**dquots
, *got
[MAXQUOTAS
] = {};
1413 struct super_block
*sb
= inode
->i_sb
;
1417 if (!dquot_active(inode
))
1420 dquots
= i_dquot(inode
);
1422 /* First get references to structures we might need. */
1423 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1427 struct dquot
*dquot
;
1429 if (type
!= -1 && cnt
!= type
)
1432 * The i_dquot should have been initialized in most cases,
1433 * we check it without locking here to avoid unnecessary
1434 * dqget()/dqput() calls.
1439 if (!sb_has_quota_active(sb
, cnt
))
1446 qid
= make_kqid_uid(inode
->i_uid
);
1449 qid
= make_kqid_gid(inode
->i_gid
);
1452 rc
= inode
->i_sb
->dq_op
->get_projid(inode
, &projid
);
1455 qid
= make_kqid_projid(projid
);
1458 dquot
= dqget(sb
, qid
);
1459 if (IS_ERR(dquot
)) {
1460 /* We raced with somebody turning quotas off... */
1461 if (PTR_ERR(dquot
) != -ESRCH
) {
1462 ret
= PTR_ERR(dquot
);
1470 /* All required i_dquot has been initialized */
1474 spin_lock(&dq_data_lock
);
1475 if (IS_NOQUOTA(inode
))
1477 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1478 if (type
!= -1 && cnt
!= type
)
1480 /* Avoid races with quotaoff() */
1481 if (!sb_has_quota_active(sb
, cnt
))
1483 /* We could race with quotaon or dqget() could have failed */
1487 dquots
[cnt
] = got
[cnt
];
1490 * Make quota reservation system happy if someone
1491 * did a write before quota was turned on
1493 rsv
= inode_get_rsv_space(inode
);
1494 if (unlikely(rsv
)) {
1495 spin_lock(&inode
->i_lock
);
1496 /* Get reservation again under proper lock */
1497 rsv
= __inode_get_rsv_space(inode
);
1498 spin_lock(&dquots
[cnt
]->dq_dqb_lock
);
1499 dquots
[cnt
]->dq_dqb
.dqb_rsvspace
+= rsv
;
1500 spin_unlock(&dquots
[cnt
]->dq_dqb_lock
);
1501 spin_unlock(&inode
->i_lock
);
1506 spin_unlock(&dq_data_lock
);
1508 /* Drop unused references */
1514 int dquot_initialize(struct inode
*inode
)
1516 return __dquot_initialize(inode
, -1);
1518 EXPORT_SYMBOL(dquot_initialize
);
1520 bool dquot_initialize_needed(struct inode
*inode
)
1522 struct dquot
**dquots
;
1525 if (!dquot_active(inode
))
1528 dquots
= i_dquot(inode
);
1529 for (i
= 0; i
< MAXQUOTAS
; i
++)
1530 if (!dquots
[i
] && sb_has_quota_active(inode
->i_sb
, i
))
1534 EXPORT_SYMBOL(dquot_initialize_needed
);
1537 * Release all quotas referenced by inode.
1539 * This function only be called on inode free or converting
1540 * a file to quota file, no other users for the i_dquot in
1541 * both cases, so we needn't call synchronize_srcu() after
1544 static void __dquot_drop(struct inode
*inode
)
1547 struct dquot
**dquots
= i_dquot(inode
);
1548 struct dquot
*put
[MAXQUOTAS
];
1550 spin_lock(&dq_data_lock
);
1551 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1552 put
[cnt
] = dquots
[cnt
];
1555 spin_unlock(&dq_data_lock
);
1559 void dquot_drop(struct inode
*inode
)
1561 struct dquot
* const *dquots
;
1564 if (IS_NOQUOTA(inode
))
1568 * Test before calling to rule out calls from proc and such
1569 * where we are not allowed to block. Note that this is
1570 * actually reliable test even without the lock - the caller
1571 * must assure that nobody can come after the DQUOT_DROP and
1572 * add quota pointers back anyway.
1574 dquots
= i_dquot(inode
);
1575 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1580 if (cnt
< MAXQUOTAS
)
1581 __dquot_drop(inode
);
1583 EXPORT_SYMBOL(dquot_drop
);
1586 * inode_reserved_space is managed internally by quota, and protected by
1587 * i_lock similar to i_blocks+i_bytes.
1589 static qsize_t
*inode_reserved_space(struct inode
* inode
)
1591 /* Filesystem must explicitly define it's own method in order to use
1592 * quota reservation interface */
1593 BUG_ON(!inode
->i_sb
->dq_op
->get_reserved_space
);
1594 return inode
->i_sb
->dq_op
->get_reserved_space(inode
);
1597 static qsize_t
__inode_get_rsv_space(struct inode
*inode
)
1599 if (!inode
->i_sb
->dq_op
->get_reserved_space
)
1601 return *inode_reserved_space(inode
);
1604 static qsize_t
inode_get_rsv_space(struct inode
*inode
)
1608 if (!inode
->i_sb
->dq_op
->get_reserved_space
)
1610 spin_lock(&inode
->i_lock
);
1611 ret
= __inode_get_rsv_space(inode
);
1612 spin_unlock(&inode
->i_lock
);
1617 * This functions updates i_blocks+i_bytes fields and quota information
1618 * (together with appropriate checks).
1620 * NOTE: We absolutely rely on the fact that caller dirties the inode
1621 * (usually helpers in quotaops.h care about this) and holds a handle for
1622 * the current transaction so that dquot write and inode write go into the
1627 * This operation can block, but only after everything is updated
1629 int __dquot_alloc_space(struct inode
*inode
, qsize_t number
, int flags
)
1631 int cnt
, ret
= 0, index
;
1632 struct dquot_warn warn
[MAXQUOTAS
];
1633 int reserve
= flags
& DQUOT_SPACE_RESERVE
;
1634 struct dquot
**dquots
;
1636 if (!dquot_active(inode
)) {
1638 spin_lock(&inode
->i_lock
);
1639 *inode_reserved_space(inode
) += number
;
1640 spin_unlock(&inode
->i_lock
);
1642 inode_add_bytes(inode
, number
);
1647 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1648 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1650 dquots
= i_dquot(inode
);
1651 index
= srcu_read_lock(&dquot_srcu
);
1652 spin_lock(&inode
->i_lock
);
1653 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1656 if (flags
& DQUOT_SPACE_RESERVE
) {
1657 ret
= dquot_add_space(dquots
[cnt
], 0, number
, flags
,
1660 ret
= dquot_add_space(dquots
[cnt
], number
, 0, flags
,
1664 /* Back out changes we already did */
1665 for (cnt
--; cnt
>= 0; cnt
--) {
1668 spin_lock(&dquots
[cnt
]->dq_dqb_lock
);
1669 if (flags
& DQUOT_SPACE_RESERVE
) {
1670 dquots
[cnt
]->dq_dqb
.dqb_rsvspace
-=
1673 dquots
[cnt
]->dq_dqb
.dqb_curspace
-=
1676 spin_unlock(&dquots
[cnt
]->dq_dqb_lock
);
1678 spin_unlock(&inode
->i_lock
);
1679 goto out_flush_warn
;
1683 *inode_reserved_space(inode
) += number
;
1685 __inode_add_bytes(inode
, number
);
1686 spin_unlock(&inode
->i_lock
);
1689 goto out_flush_warn
;
1690 mark_all_dquot_dirty(dquots
);
1692 srcu_read_unlock(&dquot_srcu
, index
);
1693 flush_warnings(warn
);
1697 EXPORT_SYMBOL(__dquot_alloc_space
);
1700 * This operation can block, but only after everything is updated
1702 int dquot_alloc_inode(struct inode
*inode
)
1704 int cnt
, ret
= 0, index
;
1705 struct dquot_warn warn
[MAXQUOTAS
];
1706 struct dquot
* const *dquots
;
1708 if (!dquot_active(inode
))
1710 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1711 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1713 dquots
= i_dquot(inode
);
1714 index
= srcu_read_lock(&dquot_srcu
);
1715 spin_lock(&inode
->i_lock
);
1716 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1719 ret
= dquot_add_inodes(dquots
[cnt
], 1, &warn
[cnt
]);
1721 for (cnt
--; cnt
>= 0; cnt
--) {
1724 /* Back out changes we already did */
1725 spin_lock(&dquots
[cnt
]->dq_dqb_lock
);
1726 dquots
[cnt
]->dq_dqb
.dqb_curinodes
--;
1727 spin_unlock(&dquots
[cnt
]->dq_dqb_lock
);
1734 spin_unlock(&inode
->i_lock
);
1736 mark_all_dquot_dirty(dquots
);
1737 srcu_read_unlock(&dquot_srcu
, index
);
1738 flush_warnings(warn
);
1741 EXPORT_SYMBOL(dquot_alloc_inode
);
1744 * Convert in-memory reserved quotas to real consumed quotas
1746 int dquot_claim_space_nodirty(struct inode
*inode
, qsize_t number
)
1748 struct dquot
**dquots
;
1751 if (!dquot_active(inode
)) {
1752 spin_lock(&inode
->i_lock
);
1753 *inode_reserved_space(inode
) -= number
;
1754 __inode_add_bytes(inode
, number
);
1755 spin_unlock(&inode
->i_lock
);
1759 dquots
= i_dquot(inode
);
1760 index
= srcu_read_lock(&dquot_srcu
);
1761 spin_lock(&inode
->i_lock
);
1762 /* Claim reserved quotas to allocated quotas */
1763 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1765 struct dquot
*dquot
= dquots
[cnt
];
1767 spin_lock(&dquot
->dq_dqb_lock
);
1768 if (WARN_ON_ONCE(dquot
->dq_dqb
.dqb_rsvspace
< number
))
1769 number
= dquot
->dq_dqb
.dqb_rsvspace
;
1770 dquot
->dq_dqb
.dqb_curspace
+= number
;
1771 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1772 spin_unlock(&dquot
->dq_dqb_lock
);
1775 /* Update inode bytes */
1776 *inode_reserved_space(inode
) -= number
;
1777 __inode_add_bytes(inode
, number
);
1778 spin_unlock(&inode
->i_lock
);
1779 mark_all_dquot_dirty(dquots
);
1780 srcu_read_unlock(&dquot_srcu
, index
);
1783 EXPORT_SYMBOL(dquot_claim_space_nodirty
);
1786 * Convert allocated space back to in-memory reserved quotas
1788 void dquot_reclaim_space_nodirty(struct inode
*inode
, qsize_t number
)
1790 struct dquot
**dquots
;
1793 if (!dquot_active(inode
)) {
1794 spin_lock(&inode
->i_lock
);
1795 *inode_reserved_space(inode
) += number
;
1796 __inode_sub_bytes(inode
, number
);
1797 spin_unlock(&inode
->i_lock
);
1801 dquots
= i_dquot(inode
);
1802 index
= srcu_read_lock(&dquot_srcu
);
1803 spin_lock(&inode
->i_lock
);
1804 /* Claim reserved quotas to allocated quotas */
1805 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1807 struct dquot
*dquot
= dquots
[cnt
];
1809 spin_lock(&dquot
->dq_dqb_lock
);
1810 if (WARN_ON_ONCE(dquot
->dq_dqb
.dqb_curspace
< number
))
1811 number
= dquot
->dq_dqb
.dqb_curspace
;
1812 dquot
->dq_dqb
.dqb_rsvspace
+= number
;
1813 dquot
->dq_dqb
.dqb_curspace
-= number
;
1814 spin_unlock(&dquot
->dq_dqb_lock
);
1817 /* Update inode bytes */
1818 *inode_reserved_space(inode
) += number
;
1819 __inode_sub_bytes(inode
, number
);
1820 spin_unlock(&inode
->i_lock
);
1821 mark_all_dquot_dirty(dquots
);
1822 srcu_read_unlock(&dquot_srcu
, index
);
1825 EXPORT_SYMBOL(dquot_reclaim_space_nodirty
);
1828 * This operation can block, but only after everything is updated
1830 void __dquot_free_space(struct inode
*inode
, qsize_t number
, int flags
)
1833 struct dquot_warn warn
[MAXQUOTAS
];
1834 struct dquot
**dquots
;
1835 int reserve
= flags
& DQUOT_SPACE_RESERVE
, index
;
1837 if (!dquot_active(inode
)) {
1839 spin_lock(&inode
->i_lock
);
1840 *inode_reserved_space(inode
) -= number
;
1841 spin_unlock(&inode
->i_lock
);
1843 inode_sub_bytes(inode
, number
);
1848 dquots
= i_dquot(inode
);
1849 index
= srcu_read_lock(&dquot_srcu
);
1850 spin_lock(&inode
->i_lock
);
1851 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1854 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1857 spin_lock(&dquots
[cnt
]->dq_dqb_lock
);
1858 wtype
= info_bdq_free(dquots
[cnt
], number
);
1859 if (wtype
!= QUOTA_NL_NOWARN
)
1860 prepare_warning(&warn
[cnt
], dquots
[cnt
], wtype
);
1862 dquot_free_reserved_space(dquots
[cnt
], number
);
1864 dquot_decr_space(dquots
[cnt
], number
);
1865 spin_unlock(&dquots
[cnt
]->dq_dqb_lock
);
1868 *inode_reserved_space(inode
) -= number
;
1870 __inode_sub_bytes(inode
, number
);
1871 spin_unlock(&inode
->i_lock
);
1875 mark_all_dquot_dirty(dquots
);
1877 srcu_read_unlock(&dquot_srcu
, index
);
1878 flush_warnings(warn
);
1880 EXPORT_SYMBOL(__dquot_free_space
);
1883 * This operation can block, but only after everything is updated
1885 void dquot_free_inode(struct inode
*inode
)
1888 struct dquot_warn warn
[MAXQUOTAS
];
1889 struct dquot
* const *dquots
;
1892 if (!dquot_active(inode
))
1895 dquots
= i_dquot(inode
);
1896 index
= srcu_read_lock(&dquot_srcu
);
1897 spin_lock(&inode
->i_lock
);
1898 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1901 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1904 spin_lock(&dquots
[cnt
]->dq_dqb_lock
);
1905 wtype
= info_idq_free(dquots
[cnt
], 1);
1906 if (wtype
!= QUOTA_NL_NOWARN
)
1907 prepare_warning(&warn
[cnt
], dquots
[cnt
], wtype
);
1908 dquot_decr_inodes(dquots
[cnt
], 1);
1909 spin_unlock(&dquots
[cnt
]->dq_dqb_lock
);
1911 spin_unlock(&inode
->i_lock
);
1912 mark_all_dquot_dirty(dquots
);
1913 srcu_read_unlock(&dquot_srcu
, index
);
1914 flush_warnings(warn
);
1916 EXPORT_SYMBOL(dquot_free_inode
);
1919 * Transfer the number of inode and blocks from one diskquota to an other.
1920 * On success, dquot references in transfer_to are consumed and references
1921 * to original dquots that need to be released are placed there. On failure,
1922 * references are kept untouched.
1924 * This operation can block, but only after everything is updated
1925 * A transaction must be started when entering this function.
1927 * We are holding reference on transfer_from & transfer_to, no need to
1928 * protect them by srcu_read_lock().
1930 int __dquot_transfer(struct inode
*inode
, struct dquot
**transfer_to
)
1933 qsize_t rsv_space
= 0;
1934 qsize_t inode_usage
= 1;
1935 struct dquot
*transfer_from
[MAXQUOTAS
] = {};
1937 char is_valid
[MAXQUOTAS
] = {};
1938 struct dquot_warn warn_to
[MAXQUOTAS
];
1939 struct dquot_warn warn_from_inodes
[MAXQUOTAS
];
1940 struct dquot_warn warn_from_space
[MAXQUOTAS
];
1942 if (IS_NOQUOTA(inode
))
1945 if (inode
->i_sb
->dq_op
->get_inode_usage
) {
1946 ret
= inode
->i_sb
->dq_op
->get_inode_usage(inode
, &inode_usage
);
1951 /* Initialize the arrays */
1952 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1953 warn_to
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1954 warn_from_inodes
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1955 warn_from_space
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1958 spin_lock(&dq_data_lock
);
1959 spin_lock(&inode
->i_lock
);
1960 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1961 spin_unlock(&inode
->i_lock
);
1962 spin_unlock(&dq_data_lock
);
1965 cur_space
= __inode_get_bytes(inode
);
1966 rsv_space
= __inode_get_rsv_space(inode
);
1968 * Build the transfer_from list, check limits, and update usage in
1969 * the target structures.
1971 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1973 * Skip changes for same uid or gid or for turned off quota-type.
1975 if (!transfer_to
[cnt
])
1977 /* Avoid races with quotaoff() */
1978 if (!sb_has_quota_active(inode
->i_sb
, cnt
))
1981 transfer_from
[cnt
] = i_dquot(inode
)[cnt
];
1982 ret
= dquot_add_inodes(transfer_to
[cnt
], inode_usage
,
1986 ret
= dquot_add_space(transfer_to
[cnt
], cur_space
, rsv_space
, 0,
1989 spin_lock(&transfer_to
[cnt
]->dq_dqb_lock
);
1990 dquot_decr_inodes(transfer_to
[cnt
], inode_usage
);
1991 spin_unlock(&transfer_to
[cnt
]->dq_dqb_lock
);
1996 /* Decrease usage for source structures and update quota pointers */
1997 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2000 /* Due to IO error we might not have transfer_from[] structure */
2001 if (transfer_from
[cnt
]) {
2004 spin_lock(&transfer_from
[cnt
]->dq_dqb_lock
);
2005 wtype
= info_idq_free(transfer_from
[cnt
], inode_usage
);
2006 if (wtype
!= QUOTA_NL_NOWARN
)
2007 prepare_warning(&warn_from_inodes
[cnt
],
2008 transfer_from
[cnt
], wtype
);
2009 wtype
= info_bdq_free(transfer_from
[cnt
],
2010 cur_space
+ rsv_space
);
2011 if (wtype
!= QUOTA_NL_NOWARN
)
2012 prepare_warning(&warn_from_space
[cnt
],
2013 transfer_from
[cnt
], wtype
);
2014 dquot_decr_inodes(transfer_from
[cnt
], inode_usage
);
2015 dquot_decr_space(transfer_from
[cnt
], cur_space
);
2016 dquot_free_reserved_space(transfer_from
[cnt
],
2018 spin_unlock(&transfer_from
[cnt
]->dq_dqb_lock
);
2020 i_dquot(inode
)[cnt
] = transfer_to
[cnt
];
2022 spin_unlock(&inode
->i_lock
);
2023 spin_unlock(&dq_data_lock
);
2025 mark_all_dquot_dirty(transfer_from
);
2026 mark_all_dquot_dirty(transfer_to
);
2027 flush_warnings(warn_to
);
2028 flush_warnings(warn_from_inodes
);
2029 flush_warnings(warn_from_space
);
2030 /* Pass back references to put */
2031 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2033 transfer_to
[cnt
] = transfer_from
[cnt
];
2036 /* Back out changes we already did */
2037 for (cnt
--; cnt
>= 0; cnt
--) {
2040 spin_lock(&transfer_to
[cnt
]->dq_dqb_lock
);
2041 dquot_decr_inodes(transfer_to
[cnt
], inode_usage
);
2042 dquot_decr_space(transfer_to
[cnt
], cur_space
);
2043 dquot_free_reserved_space(transfer_to
[cnt
], rsv_space
);
2044 spin_unlock(&transfer_to
[cnt
]->dq_dqb_lock
);
2046 spin_unlock(&inode
->i_lock
);
2047 spin_unlock(&dq_data_lock
);
2048 flush_warnings(warn_to
);
2051 EXPORT_SYMBOL(__dquot_transfer
);
2053 /* Wrapper for transferring ownership of an inode for uid/gid only
2054 * Called from FSXXX_setattr()
2056 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
2058 struct dquot
*transfer_to
[MAXQUOTAS
] = {};
2059 struct dquot
*dquot
;
2060 struct super_block
*sb
= inode
->i_sb
;
2063 if (!dquot_active(inode
))
2066 if (iattr
->ia_valid
& ATTR_UID
&& !uid_eq(iattr
->ia_uid
, inode
->i_uid
)){
2067 dquot
= dqget(sb
, make_kqid_uid(iattr
->ia_uid
));
2068 if (IS_ERR(dquot
)) {
2069 if (PTR_ERR(dquot
) != -ESRCH
) {
2070 ret
= PTR_ERR(dquot
);
2075 transfer_to
[USRQUOTA
] = dquot
;
2077 if (iattr
->ia_valid
& ATTR_GID
&& !gid_eq(iattr
->ia_gid
, inode
->i_gid
)){
2078 dquot
= dqget(sb
, make_kqid_gid(iattr
->ia_gid
));
2079 if (IS_ERR(dquot
)) {
2080 if (PTR_ERR(dquot
) != -ESRCH
) {
2081 ret
= PTR_ERR(dquot
);
2086 transfer_to
[GRPQUOTA
] = dquot
;
2088 ret
= __dquot_transfer(inode
, transfer_to
);
2090 dqput_all(transfer_to
);
2093 EXPORT_SYMBOL(dquot_transfer
);
2096 * Write info of quota file to disk
2098 int dquot_commit_info(struct super_block
*sb
, int type
)
2100 struct quota_info
*dqopt
= sb_dqopt(sb
);
2102 return dqopt
->ops
[type
]->write_file_info(sb
, type
);
2104 EXPORT_SYMBOL(dquot_commit_info
);
2106 int dquot_get_next_id(struct super_block
*sb
, struct kqid
*qid
)
2108 struct quota_info
*dqopt
= sb_dqopt(sb
);
2110 if (!sb_has_quota_active(sb
, qid
->type
))
2112 if (!dqopt
->ops
[qid
->type
]->get_next_id
)
2114 return dqopt
->ops
[qid
->type
]->get_next_id(sb
, qid
);
2116 EXPORT_SYMBOL(dquot_get_next_id
);
2119 * Definitions of diskquota operations.
2121 const struct dquot_operations dquot_operations
= {
2122 .write_dquot
= dquot_commit
,
2123 .acquire_dquot
= dquot_acquire
,
2124 .release_dquot
= dquot_release
,
2125 .mark_dirty
= dquot_mark_dquot_dirty
,
2126 .write_info
= dquot_commit_info
,
2127 .alloc_dquot
= dquot_alloc
,
2128 .destroy_dquot
= dquot_destroy
,
2129 .get_next_id
= dquot_get_next_id
,
2131 EXPORT_SYMBOL(dquot_operations
);
2134 * Generic helper for ->open on filesystems supporting disk quotas.
2136 int dquot_file_open(struct inode
*inode
, struct file
*file
)
2140 error
= generic_file_open(inode
, file
);
2141 if (!error
&& (file
->f_mode
& FMODE_WRITE
))
2142 dquot_initialize(inode
);
2145 EXPORT_SYMBOL(dquot_file_open
);
2148 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
2150 int dquot_disable(struct super_block
*sb
, int type
, unsigned int flags
)
2153 struct quota_info
*dqopt
= sb_dqopt(sb
);
2154 struct inode
*toputinode
[MAXQUOTAS
];
2156 /* s_umount should be held in exclusive mode */
2157 if (WARN_ON_ONCE(down_read_trylock(&sb
->s_umount
)))
2158 up_read(&sb
->s_umount
);
2160 /* Cannot turn off usage accounting without turning off limits, or
2161 * suspend quotas and simultaneously turn quotas off. */
2162 if ((flags
& DQUOT_USAGE_ENABLED
&& !(flags
& DQUOT_LIMITS_ENABLED
))
2163 || (flags
& DQUOT_SUSPENDED
&& flags
& (DQUOT_LIMITS_ENABLED
|
2164 DQUOT_USAGE_ENABLED
)))
2168 * Skip everything if there's nothing to do. We have to do this because
2169 * sometimes we are called when fill_super() failed and calling
2170 * sync_fs() in such cases does no good.
2172 if (!sb_any_quota_loaded(sb
))
2175 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2176 toputinode
[cnt
] = NULL
;
2177 if (type
!= -1 && cnt
!= type
)
2179 if (!sb_has_quota_loaded(sb
, cnt
))
2182 if (flags
& DQUOT_SUSPENDED
) {
2183 spin_lock(&dq_state_lock
);
2185 dquot_state_flag(DQUOT_SUSPENDED
, cnt
);
2186 spin_unlock(&dq_state_lock
);
2188 spin_lock(&dq_state_lock
);
2189 dqopt
->flags
&= ~dquot_state_flag(flags
, cnt
);
2190 /* Turning off suspended quotas? */
2191 if (!sb_has_quota_loaded(sb
, cnt
) &&
2192 sb_has_quota_suspended(sb
, cnt
)) {
2193 dqopt
->flags
&= ~dquot_state_flag(
2194 DQUOT_SUSPENDED
, cnt
);
2195 spin_unlock(&dq_state_lock
);
2196 iput(dqopt
->files
[cnt
]);
2197 dqopt
->files
[cnt
] = NULL
;
2200 spin_unlock(&dq_state_lock
);
2203 /* We still have to keep quota loaded? */
2204 if (sb_has_quota_loaded(sb
, cnt
) && !(flags
& DQUOT_SUSPENDED
))
2207 /* Note: these are blocking operations */
2208 drop_dquot_ref(sb
, cnt
);
2209 invalidate_dquots(sb
, cnt
);
2211 * Now all dquots should be invalidated, all writes done so we
2212 * should be only users of the info. No locks needed.
2214 if (info_dirty(&dqopt
->info
[cnt
]))
2215 sb
->dq_op
->write_info(sb
, cnt
);
2216 if (dqopt
->ops
[cnt
]->free_file_info
)
2217 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
2218 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
2220 toputinode
[cnt
] = dqopt
->files
[cnt
];
2221 if (!sb_has_quota_loaded(sb
, cnt
))
2222 dqopt
->files
[cnt
] = NULL
;
2223 dqopt
->info
[cnt
].dqi_flags
= 0;
2224 dqopt
->info
[cnt
].dqi_igrace
= 0;
2225 dqopt
->info
[cnt
].dqi_bgrace
= 0;
2226 dqopt
->ops
[cnt
] = NULL
;
2229 /* Skip syncing and setting flags if quota files are hidden */
2230 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
2233 /* Sync the superblock so that buffers with quota data are written to
2234 * disk (and so userspace sees correct data afterwards). */
2235 if (sb
->s_op
->sync_fs
)
2236 sb
->s_op
->sync_fs(sb
, 1);
2237 sync_blockdev(sb
->s_bdev
);
2238 /* Now the quota files are just ordinary files and we can set the
2239 * inode flags back. Moreover we discard the pagecache so that
2240 * userspace sees the writes we did bypassing the pagecache. We
2241 * must also discard the blockdev buffers so that we see the
2242 * changes done by userspace on the next quotaon() */
2243 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2244 /* This can happen when suspending quotas on remount-ro... */
2245 if (toputinode
[cnt
] && !sb_has_quota_loaded(sb
, cnt
)) {
2246 inode_lock(toputinode
[cnt
]);
2247 toputinode
[cnt
]->i_flags
&= ~S_NOQUOTA
;
2248 truncate_inode_pages(&toputinode
[cnt
]->i_data
, 0);
2249 inode_unlock(toputinode
[cnt
]);
2250 mark_inode_dirty_sync(toputinode
[cnt
]);
2253 invalidate_bdev(sb
->s_bdev
);
2255 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2256 if (toputinode
[cnt
]) {
2257 /* On remount RO, we keep the inode pointer so that we
2258 * can reenable quota on the subsequent remount RW. We
2259 * have to check 'flags' variable and not use sb_has_
2260 * function because another quotaon / quotaoff could
2261 * change global state before we got here. We refuse
2262 * to suspend quotas when there is pending delete on
2263 * the quota file... */
2264 if (!(flags
& DQUOT_SUSPENDED
))
2265 iput(toputinode
[cnt
]);
2266 else if (!toputinode
[cnt
]->i_nlink
)
2271 EXPORT_SYMBOL(dquot_disable
);
2273 int dquot_quota_off(struct super_block
*sb
, int type
)
2275 return dquot_disable(sb
, type
,
2276 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2278 EXPORT_SYMBOL(dquot_quota_off
);
2281 * Turn quotas on on a device
2285 * Helper function to turn quotas on when we already have the inode of
2286 * quota file and no quota information is loaded.
2288 static int vfs_load_quota_inode(struct inode
*inode
, int type
, int format_id
,
2291 struct quota_format_type
*fmt
= find_quota_format(format_id
);
2292 struct super_block
*sb
= inode
->i_sb
;
2293 struct quota_info
*dqopt
= sb_dqopt(sb
);
2298 if (!S_ISREG(inode
->i_mode
)) {
2302 if (IS_RDONLY(inode
)) {
2306 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
||
2307 (type
== PRJQUOTA
&& sb
->dq_op
->get_projid
== NULL
)) {
2311 /* Filesystems outside of init_user_ns not yet supported */
2312 if (sb
->s_user_ns
!= &init_user_ns
) {
2316 /* Usage always has to be set... */
2317 if (!(flags
& DQUOT_USAGE_ENABLED
)) {
2321 if (sb_has_quota_loaded(sb
, type
)) {
2326 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2327 /* As we bypass the pagecache we must now flush all the
2328 * dirty data and invalidate caches so that kernel sees
2329 * changes from userspace. It is not enough to just flush
2330 * the quota file since if blocksize < pagesize, invalidation
2331 * of the cache could fail because of other unrelated dirty
2333 sync_filesystem(sb
);
2334 invalidate_bdev(sb
->s_bdev
);
2337 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2338 /* We don't want quota and atime on quota files (deadlocks
2339 * possible) Also nobody should write to the file - we use
2340 * special IO operations which ignore the immutable bit. */
2342 inode
->i_flags
|= S_NOQUOTA
;
2343 inode_unlock(inode
);
2345 * When S_NOQUOTA is set, remove dquot references as no more
2346 * references can be added
2348 __dquot_drop(inode
);
2352 dqopt
->files
[type
] = igrab(inode
);
2353 if (!dqopt
->files
[type
])
2354 goto out_file_flags
;
2356 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
2359 dqopt
->ops
[type
] = fmt
->qf_ops
;
2360 dqopt
->info
[type
].dqi_format
= fmt
;
2361 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
2362 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
2363 error
= dqopt
->ops
[type
]->read_file_info(sb
, type
);
2366 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
) {
2367 spin_lock(&dq_data_lock
);
2368 dqopt
->info
[type
].dqi_flags
|= DQF_SYS_FILE
;
2369 spin_unlock(&dq_data_lock
);
2371 spin_lock(&dq_state_lock
);
2372 dqopt
->flags
|= dquot_state_flag(flags
, type
);
2373 spin_unlock(&dq_state_lock
);
2375 add_dquot_ref(sb
, type
);
2380 dqopt
->files
[type
] = NULL
;
2384 inode
->i_flags
&= ~S_NOQUOTA
;
2385 inode_unlock(inode
);
2387 put_quota_format(fmt
);
2392 /* Reenable quotas on remount RW */
2393 int dquot_resume(struct super_block
*sb
, int type
)
2395 struct quota_info
*dqopt
= sb_dqopt(sb
);
2396 struct inode
*inode
;
2400 /* s_umount should be held in exclusive mode */
2401 if (WARN_ON_ONCE(down_read_trylock(&sb
->s_umount
)))
2402 up_read(&sb
->s_umount
);
2404 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2405 if (type
!= -1 && cnt
!= type
)
2407 if (!sb_has_quota_suspended(sb
, cnt
))
2410 inode
= dqopt
->files
[cnt
];
2411 dqopt
->files
[cnt
] = NULL
;
2412 spin_lock(&dq_state_lock
);
2413 flags
= dqopt
->flags
& dquot_state_flag(DQUOT_USAGE_ENABLED
|
2414 DQUOT_LIMITS_ENABLED
,
2416 dqopt
->flags
&= ~dquot_state_flag(DQUOT_STATE_FLAGS
, cnt
);
2417 spin_unlock(&dq_state_lock
);
2419 flags
= dquot_generic_flag(flags
, cnt
);
2420 ret
= vfs_load_quota_inode(inode
, cnt
,
2421 dqopt
->info
[cnt
].dqi_fmt_id
, flags
);
2427 EXPORT_SYMBOL(dquot_resume
);
2429 int dquot_quota_on(struct super_block
*sb
, int type
, int format_id
,
2430 const struct path
*path
)
2432 int error
= security_quota_on(path
->dentry
);
2435 /* Quota file not on the same filesystem? */
2436 if (path
->dentry
->d_sb
!= sb
)
2439 error
= vfs_load_quota_inode(d_inode(path
->dentry
), type
,
2440 format_id
, DQUOT_USAGE_ENABLED
|
2441 DQUOT_LIMITS_ENABLED
);
2444 EXPORT_SYMBOL(dquot_quota_on
);
2447 * More powerful function for turning on quotas allowing setting
2448 * of individual quota flags
2450 int dquot_enable(struct inode
*inode
, int type
, int format_id
,
2453 struct super_block
*sb
= inode
->i_sb
;
2455 /* Just unsuspend quotas? */
2456 BUG_ON(flags
& DQUOT_SUSPENDED
);
2457 /* s_umount should be held in exclusive mode */
2458 if (WARN_ON_ONCE(down_read_trylock(&sb
->s_umount
)))
2459 up_read(&sb
->s_umount
);
2463 /* Just updating flags needed? */
2464 if (sb_has_quota_loaded(sb
, type
)) {
2465 if (flags
& DQUOT_USAGE_ENABLED
&&
2466 sb_has_quota_usage_enabled(sb
, type
))
2468 if (flags
& DQUOT_LIMITS_ENABLED
&&
2469 sb_has_quota_limits_enabled(sb
, type
))
2471 spin_lock(&dq_state_lock
);
2472 sb_dqopt(sb
)->flags
|= dquot_state_flag(flags
, type
);
2473 spin_unlock(&dq_state_lock
);
2477 return vfs_load_quota_inode(inode
, type
, format_id
, flags
);
2479 EXPORT_SYMBOL(dquot_enable
);
2482 * This function is used when filesystem needs to initialize quotas
2483 * during mount time.
2485 int dquot_quota_on_mount(struct super_block
*sb
, char *qf_name
,
2486 int format_id
, int type
)
2488 struct dentry
*dentry
;
2491 dentry
= lookup_one_len_unlocked(qf_name
, sb
->s_root
, strlen(qf_name
));
2493 return PTR_ERR(dentry
);
2495 if (d_really_is_negative(dentry
)) {
2500 error
= security_quota_on(dentry
);
2502 error
= vfs_load_quota_inode(d_inode(dentry
), type
, format_id
,
2503 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2509 EXPORT_SYMBOL(dquot_quota_on_mount
);
2511 static int dquot_quota_enable(struct super_block
*sb
, unsigned int flags
)
2515 struct quota_info
*dqopt
= sb_dqopt(sb
);
2517 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
))
2519 /* Accounting cannot be turned on while fs is mounted */
2520 flags
&= ~(FS_QUOTA_UDQ_ACCT
| FS_QUOTA_GDQ_ACCT
| FS_QUOTA_PDQ_ACCT
);
2523 for (type
= 0; type
< MAXQUOTAS
; type
++) {
2524 if (!(flags
& qtype_enforce_flag(type
)))
2526 /* Can't enforce without accounting */
2527 if (!sb_has_quota_usage_enabled(sb
, type
))
2529 ret
= dquot_enable(dqopt
->files
[type
], type
,
2530 dqopt
->info
[type
].dqi_fmt_id
,
2531 DQUOT_LIMITS_ENABLED
);
2537 /* Backout enforcement enablement we already did */
2538 for (type
--; type
>= 0; type
--) {
2539 if (flags
& qtype_enforce_flag(type
))
2540 dquot_disable(sb
, type
, DQUOT_LIMITS_ENABLED
);
2542 /* Error code translation for better compatibility with XFS */
2548 static int dquot_quota_disable(struct super_block
*sb
, unsigned int flags
)
2552 struct quota_info
*dqopt
= sb_dqopt(sb
);
2554 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
))
2557 * We don't support turning off accounting via quotactl. In principle
2558 * quota infrastructure can do this but filesystems don't expect
2559 * userspace to be able to do it.
2562 (FS_QUOTA_UDQ_ACCT
| FS_QUOTA_GDQ_ACCT
| FS_QUOTA_PDQ_ACCT
))
2565 /* Filter out limits not enabled */
2566 for (type
= 0; type
< MAXQUOTAS
; type
++)
2567 if (!sb_has_quota_limits_enabled(sb
, type
))
2568 flags
&= ~qtype_enforce_flag(type
);
2572 for (type
= 0; type
< MAXQUOTAS
; type
++) {
2573 if (flags
& qtype_enforce_flag(type
)) {
2574 ret
= dquot_disable(sb
, type
, DQUOT_LIMITS_ENABLED
);
2581 /* Backout enforcement disabling we already did */
2582 for (type
--; type
>= 0; type
--) {
2583 if (flags
& qtype_enforce_flag(type
))
2584 dquot_enable(dqopt
->files
[type
], type
,
2585 dqopt
->info
[type
].dqi_fmt_id
,
2586 DQUOT_LIMITS_ENABLED
);
2591 /* Generic routine for getting common part of quota structure */
2592 static void do_get_dqblk(struct dquot
*dquot
, struct qc_dqblk
*di
)
2594 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2596 memset(di
, 0, sizeof(*di
));
2597 spin_lock(&dquot
->dq_dqb_lock
);
2598 di
->d_spc_hardlimit
= dm
->dqb_bhardlimit
;
2599 di
->d_spc_softlimit
= dm
->dqb_bsoftlimit
;
2600 di
->d_ino_hardlimit
= dm
->dqb_ihardlimit
;
2601 di
->d_ino_softlimit
= dm
->dqb_isoftlimit
;
2602 di
->d_space
= dm
->dqb_curspace
+ dm
->dqb_rsvspace
;
2603 di
->d_ino_count
= dm
->dqb_curinodes
;
2604 di
->d_spc_timer
= dm
->dqb_btime
;
2605 di
->d_ino_timer
= dm
->dqb_itime
;
2606 spin_unlock(&dquot
->dq_dqb_lock
);
2609 int dquot_get_dqblk(struct super_block
*sb
, struct kqid qid
,
2610 struct qc_dqblk
*di
)
2612 struct dquot
*dquot
;
2614 dquot
= dqget(sb
, qid
);
2616 return PTR_ERR(dquot
);
2617 do_get_dqblk(dquot
, di
);
2622 EXPORT_SYMBOL(dquot_get_dqblk
);
2624 int dquot_get_next_dqblk(struct super_block
*sb
, struct kqid
*qid
,
2625 struct qc_dqblk
*di
)
2627 struct dquot
*dquot
;
2630 if (!sb
->dq_op
->get_next_id
)
2632 err
= sb
->dq_op
->get_next_id(sb
, qid
);
2635 dquot
= dqget(sb
, *qid
);
2637 return PTR_ERR(dquot
);
2638 do_get_dqblk(dquot
, di
);
2643 EXPORT_SYMBOL(dquot_get_next_dqblk
);
2645 #define VFS_QC_MASK \
2646 (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \
2647 QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \
2648 QC_SPC_TIMER | QC_INO_TIMER)
2650 /* Generic routine for setting common part of quota structure */
2651 static int do_set_dqblk(struct dquot
*dquot
, struct qc_dqblk
*di
)
2653 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2654 int check_blim
= 0, check_ilim
= 0;
2655 struct mem_dqinfo
*dqi
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
];
2657 if (di
->d_fieldmask
& ~VFS_QC_MASK
)
2660 if (((di
->d_fieldmask
& QC_SPC_SOFT
) &&
2661 di
->d_spc_softlimit
> dqi
->dqi_max_spc_limit
) ||
2662 ((di
->d_fieldmask
& QC_SPC_HARD
) &&
2663 di
->d_spc_hardlimit
> dqi
->dqi_max_spc_limit
) ||
2664 ((di
->d_fieldmask
& QC_INO_SOFT
) &&
2665 (di
->d_ino_softlimit
> dqi
->dqi_max_ino_limit
)) ||
2666 ((di
->d_fieldmask
& QC_INO_HARD
) &&
2667 (di
->d_ino_hardlimit
> dqi
->dqi_max_ino_limit
)))
2670 spin_lock(&dquot
->dq_dqb_lock
);
2671 if (di
->d_fieldmask
& QC_SPACE
) {
2672 dm
->dqb_curspace
= di
->d_space
- dm
->dqb_rsvspace
;
2674 set_bit(DQ_LASTSET_B
+ QIF_SPACE_B
, &dquot
->dq_flags
);
2677 if (di
->d_fieldmask
& QC_SPC_SOFT
)
2678 dm
->dqb_bsoftlimit
= di
->d_spc_softlimit
;
2679 if (di
->d_fieldmask
& QC_SPC_HARD
)
2680 dm
->dqb_bhardlimit
= di
->d_spc_hardlimit
;
2681 if (di
->d_fieldmask
& (QC_SPC_SOFT
| QC_SPC_HARD
)) {
2683 set_bit(DQ_LASTSET_B
+ QIF_BLIMITS_B
, &dquot
->dq_flags
);
2686 if (di
->d_fieldmask
& QC_INO_COUNT
) {
2687 dm
->dqb_curinodes
= di
->d_ino_count
;
2689 set_bit(DQ_LASTSET_B
+ QIF_INODES_B
, &dquot
->dq_flags
);
2692 if (di
->d_fieldmask
& QC_INO_SOFT
)
2693 dm
->dqb_isoftlimit
= di
->d_ino_softlimit
;
2694 if (di
->d_fieldmask
& QC_INO_HARD
)
2695 dm
->dqb_ihardlimit
= di
->d_ino_hardlimit
;
2696 if (di
->d_fieldmask
& (QC_INO_SOFT
| QC_INO_HARD
)) {
2698 set_bit(DQ_LASTSET_B
+ QIF_ILIMITS_B
, &dquot
->dq_flags
);
2701 if (di
->d_fieldmask
& QC_SPC_TIMER
) {
2702 dm
->dqb_btime
= di
->d_spc_timer
;
2704 set_bit(DQ_LASTSET_B
+ QIF_BTIME_B
, &dquot
->dq_flags
);
2707 if (di
->d_fieldmask
& QC_INO_TIMER
) {
2708 dm
->dqb_itime
= di
->d_ino_timer
;
2710 set_bit(DQ_LASTSET_B
+ QIF_ITIME_B
, &dquot
->dq_flags
);
2714 if (!dm
->dqb_bsoftlimit
||
2715 dm
->dqb_curspace
+ dm
->dqb_rsvspace
< dm
->dqb_bsoftlimit
) {
2717 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
2718 } else if (!(di
->d_fieldmask
& QC_SPC_TIMER
))
2719 /* Set grace only if user hasn't provided his own... */
2720 dm
->dqb_btime
= ktime_get_real_seconds() + dqi
->dqi_bgrace
;
2723 if (!dm
->dqb_isoftlimit
||
2724 dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
2726 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
2727 } else if (!(di
->d_fieldmask
& QC_INO_TIMER
))
2728 /* Set grace only if user hasn't provided his own... */
2729 dm
->dqb_itime
= ktime_get_real_seconds() + dqi
->dqi_igrace
;
2731 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
||
2733 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2735 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2736 spin_unlock(&dquot
->dq_dqb_lock
);
2737 mark_dquot_dirty(dquot
);
2742 int dquot_set_dqblk(struct super_block
*sb
, struct kqid qid
,
2743 struct qc_dqblk
*di
)
2745 struct dquot
*dquot
;
2748 dquot
= dqget(sb
, qid
);
2749 if (IS_ERR(dquot
)) {
2750 rc
= PTR_ERR(dquot
);
2753 rc
= do_set_dqblk(dquot
, di
);
2758 EXPORT_SYMBOL(dquot_set_dqblk
);
2760 /* Generic routine for getting common part of quota file information */
2761 int dquot_get_state(struct super_block
*sb
, struct qc_state
*state
)
2763 struct mem_dqinfo
*mi
;
2764 struct qc_type_state
*tstate
;
2765 struct quota_info
*dqopt
= sb_dqopt(sb
);
2768 memset(state
, 0, sizeof(*state
));
2769 for (type
= 0; type
< MAXQUOTAS
; type
++) {
2770 if (!sb_has_quota_active(sb
, type
))
2772 tstate
= state
->s_state
+ type
;
2773 mi
= sb_dqopt(sb
)->info
+ type
;
2774 tstate
->flags
= QCI_ACCT_ENABLED
;
2775 spin_lock(&dq_data_lock
);
2776 if (mi
->dqi_flags
& DQF_SYS_FILE
)
2777 tstate
->flags
|= QCI_SYSFILE
;
2778 if (mi
->dqi_flags
& DQF_ROOT_SQUASH
)
2779 tstate
->flags
|= QCI_ROOT_SQUASH
;
2780 if (sb_has_quota_limits_enabled(sb
, type
))
2781 tstate
->flags
|= QCI_LIMITS_ENFORCED
;
2782 tstate
->spc_timelimit
= mi
->dqi_bgrace
;
2783 tstate
->ino_timelimit
= mi
->dqi_igrace
;
2784 tstate
->ino
= dqopt
->files
[type
]->i_ino
;
2785 tstate
->blocks
= dqopt
->files
[type
]->i_blocks
;
2786 tstate
->nextents
= 1; /* We don't know... */
2787 spin_unlock(&dq_data_lock
);
2791 EXPORT_SYMBOL(dquot_get_state
);
2793 /* Generic routine for setting common part of quota file information */
2794 int dquot_set_dqinfo(struct super_block
*sb
, int type
, struct qc_info
*ii
)
2796 struct mem_dqinfo
*mi
;
2799 if ((ii
->i_fieldmask
& QC_WARNS_MASK
) ||
2800 (ii
->i_fieldmask
& QC_RT_SPC_TIMER
))
2802 if (!sb_has_quota_active(sb
, type
))
2804 mi
= sb_dqopt(sb
)->info
+ type
;
2805 if (ii
->i_fieldmask
& QC_FLAGS
) {
2806 if ((ii
->i_flags
& QCI_ROOT_SQUASH
&&
2807 mi
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
))
2810 spin_lock(&dq_data_lock
);
2811 if (ii
->i_fieldmask
& QC_SPC_TIMER
)
2812 mi
->dqi_bgrace
= ii
->i_spc_timelimit
;
2813 if (ii
->i_fieldmask
& QC_INO_TIMER
)
2814 mi
->dqi_igrace
= ii
->i_ino_timelimit
;
2815 if (ii
->i_fieldmask
& QC_FLAGS
) {
2816 if (ii
->i_flags
& QCI_ROOT_SQUASH
)
2817 mi
->dqi_flags
|= DQF_ROOT_SQUASH
;
2819 mi
->dqi_flags
&= ~DQF_ROOT_SQUASH
;
2821 spin_unlock(&dq_data_lock
);
2822 mark_info_dirty(sb
, type
);
2823 /* Force write to disk */
2824 sb
->dq_op
->write_info(sb
, type
);
2827 EXPORT_SYMBOL(dquot_set_dqinfo
);
2829 const struct quotactl_ops dquot_quotactl_sysfile_ops
= {
2830 .quota_enable
= dquot_quota_enable
,
2831 .quota_disable
= dquot_quota_disable
,
2832 .quota_sync
= dquot_quota_sync
,
2833 .get_state
= dquot_get_state
,
2834 .set_info
= dquot_set_dqinfo
,
2835 .get_dqblk
= dquot_get_dqblk
,
2836 .get_nextdqblk
= dquot_get_next_dqblk
,
2837 .set_dqblk
= dquot_set_dqblk
2839 EXPORT_SYMBOL(dquot_quotactl_sysfile_ops
);
2841 static int do_proc_dqstats(struct ctl_table
*table
, int write
,
2842 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2844 unsigned int type
= (int *)table
->data
- dqstats
.stat
;
2846 /* Update global table */
2847 dqstats
.stat
[type
] =
2848 percpu_counter_sum_positive(&dqstats
.counter
[type
]);
2849 return proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
2852 static struct ctl_table fs_dqstats_table
[] = {
2854 .procname
= "lookups",
2855 .data
= &dqstats
.stat
[DQST_LOOKUPS
],
2856 .maxlen
= sizeof(int),
2858 .proc_handler
= do_proc_dqstats
,
2861 .procname
= "drops",
2862 .data
= &dqstats
.stat
[DQST_DROPS
],
2863 .maxlen
= sizeof(int),
2865 .proc_handler
= do_proc_dqstats
,
2868 .procname
= "reads",
2869 .data
= &dqstats
.stat
[DQST_READS
],
2870 .maxlen
= sizeof(int),
2872 .proc_handler
= do_proc_dqstats
,
2875 .procname
= "writes",
2876 .data
= &dqstats
.stat
[DQST_WRITES
],
2877 .maxlen
= sizeof(int),
2879 .proc_handler
= do_proc_dqstats
,
2882 .procname
= "cache_hits",
2883 .data
= &dqstats
.stat
[DQST_CACHE_HITS
],
2884 .maxlen
= sizeof(int),
2886 .proc_handler
= do_proc_dqstats
,
2889 .procname
= "allocated_dquots",
2890 .data
= &dqstats
.stat
[DQST_ALLOC_DQUOTS
],
2891 .maxlen
= sizeof(int),
2893 .proc_handler
= do_proc_dqstats
,
2896 .procname
= "free_dquots",
2897 .data
= &dqstats
.stat
[DQST_FREE_DQUOTS
],
2898 .maxlen
= sizeof(int),
2900 .proc_handler
= do_proc_dqstats
,
2903 .procname
= "syncs",
2904 .data
= &dqstats
.stat
[DQST_SYNCS
],
2905 .maxlen
= sizeof(int),
2907 .proc_handler
= do_proc_dqstats
,
2909 #ifdef CONFIG_PRINT_QUOTA_WARNING
2911 .procname
= "warnings",
2912 .data
= &flag_print_warnings
,
2913 .maxlen
= sizeof(int),
2915 .proc_handler
= proc_dointvec
,
2921 static struct ctl_table fs_table
[] = {
2923 .procname
= "quota",
2925 .child
= fs_dqstats_table
,
2930 static struct ctl_table sys_table
[] = {
2939 static int __init
dquot_init(void)
2942 unsigned long nr_hash
, order
;
2944 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2946 register_sysctl_table(sys_table
);
2948 dquot_cachep
= kmem_cache_create("dquot",
2949 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2950 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2951 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2955 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
2957 panic("Cannot create dquot hash table");
2959 for (i
= 0; i
< _DQST_DQSTAT_LAST
; i
++) {
2960 ret
= percpu_counter_init(&dqstats
.counter
[i
], 0, GFP_KERNEL
);
2962 panic("Cannot create dquot stat counters");
2965 /* Find power-of-two hlist_heads which can fit into allocation */
2966 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2970 } while (nr_hash
>> dq_hash_bits
);
2973 nr_hash
= 1UL << dq_hash_bits
;
2974 dq_hash_mask
= nr_hash
- 1;
2975 for (i
= 0; i
< nr_hash
; i
++)
2976 INIT_HLIST_HEAD(dquot_hash
+ i
);
2978 pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld,"
2979 " %ld bytes)\n", nr_hash
, order
, (PAGE_SIZE
<< order
));
2981 register_shrinker(&dqcache_shrinker
);
2985 fs_initcall(dquot_init
);