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 <linux/blkdev.h>
82 #include "../internal.h" /* ugh */
84 #include <linux/uaccess.h>
87 * There are five quota SMP locks:
88 * * dq_list_lock protects all lists with quotas and quota formats.
89 * * dquot->dq_dqb_lock protects data from dq_dqb
90 * * inode->i_lock protects inode->i_blocks, i_bytes and also guards
91 * consistency of dquot->dq_dqb with inode->i_blocks, i_bytes so that
92 * dquot_transfer() can stabilize amount it transfers
93 * * dq_data_lock protects mem_dqinfo structures and modifications of dquot
94 * pointers in the inode
95 * * dq_state_lock protects modifications of quota state (on quotaon and
96 * quotaoff) and readers who care about latest values take it as well.
98 * The spinlock ordering is hence:
99 * dq_data_lock > dq_list_lock > i_lock > dquot->dq_dqb_lock,
100 * dq_list_lock > dq_state_lock
102 * Note that some things (eg. sb pointer, type, id) doesn't change during
103 * the life of the dquot structure and so needn't to be protected by a lock
105 * Operation accessing dquots via inode pointers are protected by dquot_srcu.
106 * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and
107 * synchronize_srcu(&dquot_srcu) is called after clearing pointers from
108 * inode and before dropping dquot references to avoid use of dquots after
109 * they are freed. dq_data_lock is used to serialize the pointer setting and
110 * clearing operations.
111 * Special care needs to be taken about S_NOQUOTA inode flag (marking that
112 * inode is a quota file). Functions adding pointers from inode to dquots have
113 * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they
114 * have to do all pointer modifications before dropping dq_data_lock. This makes
115 * sure they cannot race with quotaon which first sets S_NOQUOTA flag and
116 * then drops all pointers to dquots from an inode.
118 * Each dquot has its dq_lock mutex. Dquot is locked when it is being read to
119 * memory (or space for it is being allocated) on the first dqget(), when it is
120 * being written out, and when it is being released on the last dqput(). The
121 * allocation and release operations are serialized by the dq_lock and by
122 * checking the use count in dquot_release().
124 * Lock ordering (including related VFS locks) is the following:
125 * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem
128 static __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_list_lock
);
129 static __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_state_lock
);
130 __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_data_lock
);
131 EXPORT_SYMBOL(dq_data_lock
);
132 DEFINE_STATIC_SRCU(dquot_srcu
);
134 static DECLARE_WAIT_QUEUE_HEAD(dquot_ref_wq
);
136 void __quota_error(struct super_block
*sb
, const char *func
,
137 const char *fmt
, ...)
139 if (printk_ratelimit()) {
141 struct va_format vaf
;
148 printk(KERN_ERR
"Quota error (device %s): %s: %pV\n",
149 sb
->s_id
, func
, &vaf
);
154 EXPORT_SYMBOL(__quota_error
);
156 #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING)
157 static char *quotatypes
[] = INITQFNAMES
;
159 static struct quota_format_type
*quota_formats
; /* List of registered formats */
160 static struct quota_module_name module_names
[] = INIT_QUOTA_MODULE_NAMES
;
162 /* SLAB cache for dquot structures */
163 static struct kmem_cache
*dquot_cachep
;
165 int register_quota_format(struct quota_format_type
*fmt
)
167 spin_lock(&dq_list_lock
);
168 fmt
->qf_next
= quota_formats
;
170 spin_unlock(&dq_list_lock
);
173 EXPORT_SYMBOL(register_quota_format
);
175 void unregister_quota_format(struct quota_format_type
*fmt
)
177 struct quota_format_type
**actqf
;
179 spin_lock(&dq_list_lock
);
180 for (actqf
= "a_formats
; *actqf
&& *actqf
!= fmt
;
181 actqf
= &(*actqf
)->qf_next
)
184 *actqf
= (*actqf
)->qf_next
;
185 spin_unlock(&dq_list_lock
);
187 EXPORT_SYMBOL(unregister_quota_format
);
189 static struct quota_format_type
*find_quota_format(int id
)
191 struct quota_format_type
*actqf
;
193 spin_lock(&dq_list_lock
);
194 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
195 actqf
= actqf
->qf_next
)
197 if (!actqf
|| !try_module_get(actqf
->qf_owner
)) {
200 spin_unlock(&dq_list_lock
);
202 for (qm
= 0; module_names
[qm
].qm_fmt_id
&&
203 module_names
[qm
].qm_fmt_id
!= id
; qm
++)
205 if (!module_names
[qm
].qm_fmt_id
||
206 request_module(module_names
[qm
].qm_mod_name
))
209 spin_lock(&dq_list_lock
);
210 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
211 actqf
= actqf
->qf_next
)
213 if (actqf
&& !try_module_get(actqf
->qf_owner
))
216 spin_unlock(&dq_list_lock
);
220 static void put_quota_format(struct quota_format_type
*fmt
)
222 module_put(fmt
->qf_owner
);
226 * Dquot List Management:
227 * The quota code uses four lists for dquot management: the inuse_list,
228 * free_dquots, dqi_dirty_list, and dquot_hash[] array. A single dquot
229 * structure may be on some of those lists, depending on its current state.
231 * All dquots are placed to the end of inuse_list when first created, and this
232 * list is used for invalidate operation, which must look at every dquot.
234 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
235 * and this list is searched whenever we need an available dquot. Dquots are
236 * removed from the list as soon as they are used again, and
237 * dqstats.free_dquots gives the number of dquots on the list. When
238 * dquot is invalidated it's completely released from memory.
240 * Dirty dquots are added to the dqi_dirty_list of quota_info when mark
241 * dirtied, and this list is searched when writing dirty dquots back to
242 * quota file. Note that some filesystems do dirty dquot tracking on their
243 * own (e.g. in a journal) and thus don't use dqi_dirty_list.
245 * Dquots with a specific identity (device, type and id) are placed on
246 * one of the dquot_hash[] hash chains. The provides an efficient search
247 * mechanism to locate a specific dquot.
250 static LIST_HEAD(inuse_list
);
251 static LIST_HEAD(free_dquots
);
252 static unsigned int dq_hash_bits
, dq_hash_mask
;
253 static struct hlist_head
*dquot_hash
;
255 struct dqstats dqstats
;
256 EXPORT_SYMBOL(dqstats
);
258 static qsize_t
inode_get_rsv_space(struct inode
*inode
);
259 static qsize_t
__inode_get_rsv_space(struct inode
*inode
);
260 static int __dquot_initialize(struct inode
*inode
, int type
);
262 static inline unsigned int
263 hashfn(const struct super_block
*sb
, struct kqid qid
)
265 unsigned int id
= from_kqid(&init_user_ns
, qid
);
269 tmp
= (((unsigned long)sb
>>L1_CACHE_SHIFT
) ^ id
) * (MAXQUOTAS
- type
);
270 return (tmp
+ (tmp
>> dq_hash_bits
)) & dq_hash_mask
;
274 * Following list functions expect dq_list_lock to be held
276 static inline void insert_dquot_hash(struct dquot
*dquot
)
278 struct hlist_head
*head
;
279 head
= dquot_hash
+ hashfn(dquot
->dq_sb
, dquot
->dq_id
);
280 hlist_add_head(&dquot
->dq_hash
, head
);
283 static inline void remove_dquot_hash(struct dquot
*dquot
)
285 hlist_del_init(&dquot
->dq_hash
);
288 static struct dquot
*find_dquot(unsigned int hashent
, struct super_block
*sb
,
293 hlist_for_each_entry(dquot
, dquot_hash
+hashent
, dq_hash
)
294 if (dquot
->dq_sb
== sb
&& qid_eq(dquot
->dq_id
, qid
))
300 /* Add a dquot to the tail of the free list */
301 static inline void put_dquot_last(struct dquot
*dquot
)
303 list_add_tail(&dquot
->dq_free
, &free_dquots
);
304 dqstats_inc(DQST_FREE_DQUOTS
);
307 static inline void remove_free_dquot(struct dquot
*dquot
)
309 if (list_empty(&dquot
->dq_free
))
311 list_del_init(&dquot
->dq_free
);
312 dqstats_dec(DQST_FREE_DQUOTS
);
315 static inline void put_inuse(struct dquot
*dquot
)
317 /* We add to the back of inuse list so we don't have to restart
318 * when traversing this list and we block */
319 list_add_tail(&dquot
->dq_inuse
, &inuse_list
);
320 dqstats_inc(DQST_ALLOC_DQUOTS
);
323 static inline void remove_inuse(struct dquot
*dquot
)
325 dqstats_dec(DQST_ALLOC_DQUOTS
);
326 list_del(&dquot
->dq_inuse
);
329 * End of list functions needing dq_list_lock
332 static void wait_on_dquot(struct dquot
*dquot
)
334 mutex_lock(&dquot
->dq_lock
);
335 mutex_unlock(&dquot
->dq_lock
);
338 static inline int dquot_dirty(struct dquot
*dquot
)
340 return test_bit(DQ_MOD_B
, &dquot
->dq_flags
);
343 static inline int mark_dquot_dirty(struct dquot
*dquot
)
345 return dquot
->dq_sb
->dq_op
->mark_dirty(dquot
);
348 /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */
349 int dquot_mark_dquot_dirty(struct dquot
*dquot
)
353 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
356 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NOLIST_DIRTY
)
357 return test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
);
359 /* If quota is dirty already, we don't have to acquire dq_list_lock */
360 if (test_bit(DQ_MOD_B
, &dquot
->dq_flags
))
363 spin_lock(&dq_list_lock
);
364 if (!test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
)) {
365 list_add(&dquot
->dq_dirty
, &sb_dqopt(dquot
->dq_sb
)->
366 info
[dquot
->dq_id
.type
].dqi_dirty_list
);
369 spin_unlock(&dq_list_lock
);
372 EXPORT_SYMBOL(dquot_mark_dquot_dirty
);
374 /* Dirtify all the dquots - this can block when journalling */
375 static inline int mark_all_dquot_dirty(struct dquot
* const *dquot
)
380 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
382 /* Even in case of error we have to continue */
383 ret
= mark_dquot_dirty(dquot
[cnt
]);
390 static inline void dqput_all(struct dquot
**dquot
)
394 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
398 static inline int clear_dquot_dirty(struct dquot
*dquot
)
400 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NOLIST_DIRTY
)
401 return test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
);
403 spin_lock(&dq_list_lock
);
404 if (!test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
)) {
405 spin_unlock(&dq_list_lock
);
408 list_del_init(&dquot
->dq_dirty
);
409 spin_unlock(&dq_list_lock
);
413 void mark_info_dirty(struct super_block
*sb
, int type
)
415 spin_lock(&dq_data_lock
);
416 sb_dqopt(sb
)->info
[type
].dqi_flags
|= DQF_INFO_DIRTY
;
417 spin_unlock(&dq_data_lock
);
419 EXPORT_SYMBOL(mark_info_dirty
);
422 * Read dquot from disk and alloc space for it
425 int dquot_acquire(struct dquot
*dquot
)
427 int ret
= 0, ret2
= 0;
428 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
430 mutex_lock(&dquot
->dq_lock
);
431 if (!test_bit(DQ_READ_B
, &dquot
->dq_flags
)) {
432 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->read_dqblk(dquot
);
436 /* Make sure flags update is visible after dquot has been filled */
437 smp_mb__before_atomic();
438 set_bit(DQ_READ_B
, &dquot
->dq_flags
);
439 /* Instantiate dquot if needed */
440 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && !dquot
->dq_off
) {
441 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->commit_dqblk(dquot
);
442 /* Write the info if needed */
443 if (info_dirty(&dqopt
->info
[dquot
->dq_id
.type
])) {
444 ret2
= dqopt
->ops
[dquot
->dq_id
.type
]->write_file_info(
445 dquot
->dq_sb
, dquot
->dq_id
.type
);
455 * Make sure flags update is visible after on-disk struct has been
456 * allocated. Paired with smp_rmb() in dqget().
458 smp_mb__before_atomic();
459 set_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
461 mutex_unlock(&dquot
->dq_lock
);
464 EXPORT_SYMBOL(dquot_acquire
);
467 * Write dquot to disk
469 int dquot_commit(struct dquot
*dquot
)
472 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
474 mutex_lock(&dquot
->dq_lock
);
475 if (!clear_dquot_dirty(dquot
))
477 /* Inactive dquot can be only if there was error during read/init
478 * => we have better not writing it */
479 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
480 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->commit_dqblk(dquot
);
484 mutex_unlock(&dquot
->dq_lock
);
487 EXPORT_SYMBOL(dquot_commit
);
492 int dquot_release(struct dquot
*dquot
)
494 int ret
= 0, ret2
= 0;
495 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
497 mutex_lock(&dquot
->dq_lock
);
498 /* Check whether we are not racing with some other dqget() */
499 if (dquot_is_busy(dquot
))
501 if (dqopt
->ops
[dquot
->dq_id
.type
]->release_dqblk
) {
502 ret
= dqopt
->ops
[dquot
->dq_id
.type
]->release_dqblk(dquot
);
504 if (info_dirty(&dqopt
->info
[dquot
->dq_id
.type
])) {
505 ret2
= dqopt
->ops
[dquot
->dq_id
.type
]->write_file_info(
506 dquot
->dq_sb
, dquot
->dq_id
.type
);
511 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
513 mutex_unlock(&dquot
->dq_lock
);
516 EXPORT_SYMBOL(dquot_release
);
518 void dquot_destroy(struct dquot
*dquot
)
520 kmem_cache_free(dquot_cachep
, dquot
);
522 EXPORT_SYMBOL(dquot_destroy
);
524 static inline void do_destroy_dquot(struct dquot
*dquot
)
526 dquot
->dq_sb
->dq_op
->destroy_dquot(dquot
);
529 /* Invalidate all dquots on the list. Note that this function is called after
530 * quota is disabled and pointers from inodes removed so there cannot be new
531 * quota users. There can still be some users of quotas due to inodes being
532 * just deleted or pruned by prune_icache() (those are not attached to any
533 * list) or parallel quotactl call. We have to wait for such users.
535 static void invalidate_dquots(struct super_block
*sb
, int type
)
537 struct dquot
*dquot
, *tmp
;
540 spin_lock(&dq_list_lock
);
541 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
542 if (dquot
->dq_sb
!= sb
)
544 if (dquot
->dq_id
.type
!= type
)
546 /* Wait for dquot users */
547 if (atomic_read(&dquot
->dq_count
)) {
549 spin_unlock(&dq_list_lock
);
551 * Once dqput() wakes us up, we know it's time to free
553 * IMPORTANT: we rely on the fact that there is always
554 * at most one process waiting for dquot to free.
555 * Otherwise dq_count would be > 1 and we would never
558 wait_event(dquot_ref_wq
,
559 atomic_read(&dquot
->dq_count
) == 1);
561 /* At this moment dquot() need not exist (it could be
562 * reclaimed by prune_dqcache(). Hence we must
567 * Quota now has no users and it has been written on last
570 remove_dquot_hash(dquot
);
571 remove_free_dquot(dquot
);
573 do_destroy_dquot(dquot
);
575 spin_unlock(&dq_list_lock
);
578 /* Call callback for every active dquot on given filesystem */
579 int dquot_scan_active(struct super_block
*sb
,
580 int (*fn
)(struct dquot
*dquot
, unsigned long priv
),
583 struct dquot
*dquot
, *old_dquot
= NULL
;
586 WARN_ON_ONCE(!rwsem_is_locked(&sb
->s_umount
));
588 spin_lock(&dq_list_lock
);
589 list_for_each_entry(dquot
, &inuse_list
, dq_inuse
) {
590 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
592 if (dquot
->dq_sb
!= sb
)
594 /* Now we have active dquot so we can just increase use count */
595 atomic_inc(&dquot
->dq_count
);
596 spin_unlock(&dq_list_lock
);
600 * ->release_dquot() can be racing with us. Our reference
601 * protects us from new calls to it so just wait for any
602 * outstanding call and recheck the DQ_ACTIVE_B after that.
604 wait_on_dquot(dquot
);
605 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
606 ret
= fn(dquot
, priv
);
610 spin_lock(&dq_list_lock
);
611 /* We are safe to continue now because our dquot could not
612 * be moved out of the inuse list while we hold the reference */
614 spin_unlock(&dq_list_lock
);
619 EXPORT_SYMBOL(dquot_scan_active
);
621 /* Write all dquot structures to quota files */
622 int dquot_writeback_dquots(struct super_block
*sb
, int type
)
624 struct list_head dirty
;
626 struct quota_info
*dqopt
= sb_dqopt(sb
);
630 WARN_ON_ONCE(!rwsem_is_locked(&sb
->s_umount
));
632 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
633 if (type
!= -1 && cnt
!= type
)
635 if (!sb_has_quota_active(sb
, cnt
))
637 spin_lock(&dq_list_lock
);
638 /* Move list away to avoid livelock. */
639 list_replace_init(&dqopt
->info
[cnt
].dqi_dirty_list
, &dirty
);
640 while (!list_empty(&dirty
)) {
641 dquot
= list_first_entry(&dirty
, struct dquot
,
644 WARN_ON(!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
));
646 /* Now we have active dquot from which someone is
647 * holding reference so we can safely just increase
650 spin_unlock(&dq_list_lock
);
651 err
= sb
->dq_op
->write_dquot(dquot
);
654 * Clear dirty bit anyway to avoid infinite
657 clear_dquot_dirty(dquot
);
662 spin_lock(&dq_list_lock
);
664 spin_unlock(&dq_list_lock
);
667 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
668 if ((cnt
== type
|| type
== -1) && sb_has_quota_active(sb
, cnt
)
669 && info_dirty(&dqopt
->info
[cnt
]))
670 sb
->dq_op
->write_info(sb
, cnt
);
671 dqstats_inc(DQST_SYNCS
);
675 EXPORT_SYMBOL(dquot_writeback_dquots
);
677 /* Write all dquot structures to disk and make them visible from userspace */
678 int dquot_quota_sync(struct super_block
*sb
, int type
)
680 struct quota_info
*dqopt
= sb_dqopt(sb
);
684 ret
= dquot_writeback_dquots(sb
, type
);
687 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
690 /* This is not very clever (and fast) but currently I don't know about
691 * any other simple way of getting quota data to disk and we must get
692 * them there for userspace to be visible... */
693 if (sb
->s_op
->sync_fs
)
694 sb
->s_op
->sync_fs(sb
, 1);
695 sync_blockdev(sb
->s_bdev
);
698 * Now when everything is written we can discard the pagecache so
699 * that userspace sees the changes.
701 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
702 if (type
!= -1 && cnt
!= type
)
704 if (!sb_has_quota_active(sb
, cnt
))
706 inode_lock(dqopt
->files
[cnt
]);
707 truncate_inode_pages(&dqopt
->files
[cnt
]->i_data
, 0);
708 inode_unlock(dqopt
->files
[cnt
]);
713 EXPORT_SYMBOL(dquot_quota_sync
);
716 dqcache_shrink_scan(struct shrinker
*shrink
, struct shrink_control
*sc
)
719 unsigned long freed
= 0;
721 spin_lock(&dq_list_lock
);
722 while (!list_empty(&free_dquots
) && sc
->nr_to_scan
) {
723 dquot
= list_first_entry(&free_dquots
, struct dquot
, dq_free
);
724 remove_dquot_hash(dquot
);
725 remove_free_dquot(dquot
);
727 do_destroy_dquot(dquot
);
731 spin_unlock(&dq_list_lock
);
736 dqcache_shrink_count(struct shrinker
*shrink
, struct shrink_control
*sc
)
738 return vfs_pressure_ratio(
739 percpu_counter_read_positive(&dqstats
.counter
[DQST_FREE_DQUOTS
]));
742 static struct shrinker dqcache_shrinker
= {
743 .count_objects
= dqcache_shrink_count
,
744 .scan_objects
= dqcache_shrink_scan
,
745 .seeks
= DEFAULT_SEEKS
,
749 * Put reference to dquot
751 void dqput(struct dquot
*dquot
)
757 #ifdef CONFIG_QUOTA_DEBUG
758 if (!atomic_read(&dquot
->dq_count
)) {
759 quota_error(dquot
->dq_sb
, "trying to free free dquot of %s %d",
760 quotatypes
[dquot
->dq_id
.type
],
761 from_kqid(&init_user_ns
, dquot
->dq_id
));
765 dqstats_inc(DQST_DROPS
);
767 spin_lock(&dq_list_lock
);
768 if (atomic_read(&dquot
->dq_count
) > 1) {
769 /* We have more than one user... nothing to do */
770 atomic_dec(&dquot
->dq_count
);
771 /* Releasing dquot during quotaoff phase? */
772 if (!sb_has_quota_active(dquot
->dq_sb
, dquot
->dq_id
.type
) &&
773 atomic_read(&dquot
->dq_count
) == 1)
774 wake_up(&dquot_ref_wq
);
775 spin_unlock(&dq_list_lock
);
778 /* Need to release dquot? */
779 if (dquot_dirty(dquot
)) {
780 spin_unlock(&dq_list_lock
);
781 /* Commit dquot before releasing */
782 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
784 quota_error(dquot
->dq_sb
, "Can't write quota structure"
785 " (error %d). Quota may get out of sync!",
788 * We clear dirty bit anyway, so that we avoid
791 clear_dquot_dirty(dquot
);
795 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
796 spin_unlock(&dq_list_lock
);
797 dquot
->dq_sb
->dq_op
->release_dquot(dquot
);
800 atomic_dec(&dquot
->dq_count
);
801 #ifdef CONFIG_QUOTA_DEBUG
803 BUG_ON(!list_empty(&dquot
->dq_free
));
805 put_dquot_last(dquot
);
806 spin_unlock(&dq_list_lock
);
808 EXPORT_SYMBOL(dqput
);
810 struct dquot
*dquot_alloc(struct super_block
*sb
, int type
)
812 return kmem_cache_zalloc(dquot_cachep
, GFP_NOFS
);
814 EXPORT_SYMBOL(dquot_alloc
);
816 static struct dquot
*get_empty_dquot(struct super_block
*sb
, int type
)
820 dquot
= sb
->dq_op
->alloc_dquot(sb
, type
);
824 mutex_init(&dquot
->dq_lock
);
825 INIT_LIST_HEAD(&dquot
->dq_free
);
826 INIT_LIST_HEAD(&dquot
->dq_inuse
);
827 INIT_HLIST_NODE(&dquot
->dq_hash
);
828 INIT_LIST_HEAD(&dquot
->dq_dirty
);
830 dquot
->dq_id
= make_kqid_invalid(type
);
831 atomic_set(&dquot
->dq_count
, 1);
832 spin_lock_init(&dquot
->dq_dqb_lock
);
838 * Get reference to dquot
840 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
841 * destroying our dquot by:
842 * a) checking for quota flags under dq_list_lock and
843 * b) getting a reference to dquot before we release dq_list_lock
845 struct dquot
*dqget(struct super_block
*sb
, struct kqid qid
)
847 unsigned int hashent
= hashfn(sb
, qid
);
848 struct dquot
*dquot
, *empty
= NULL
;
850 if (!qid_has_mapping(sb
->s_user_ns
, qid
))
851 return ERR_PTR(-EINVAL
);
853 if (!sb_has_quota_active(sb
, qid
.type
))
854 return ERR_PTR(-ESRCH
);
856 spin_lock(&dq_list_lock
);
857 spin_lock(&dq_state_lock
);
858 if (!sb_has_quota_active(sb
, qid
.type
)) {
859 spin_unlock(&dq_state_lock
);
860 spin_unlock(&dq_list_lock
);
861 dquot
= ERR_PTR(-ESRCH
);
864 spin_unlock(&dq_state_lock
);
866 dquot
= find_dquot(hashent
, sb
, qid
);
869 spin_unlock(&dq_list_lock
);
870 empty
= get_empty_dquot(sb
, qid
.type
);
872 schedule(); /* Try to wait for a moment... */
878 /* all dquots go on the inuse_list */
880 /* hash it first so it can be found */
881 insert_dquot_hash(dquot
);
882 spin_unlock(&dq_list_lock
);
883 dqstats_inc(DQST_LOOKUPS
);
885 if (!atomic_read(&dquot
->dq_count
))
886 remove_free_dquot(dquot
);
887 atomic_inc(&dquot
->dq_count
);
888 spin_unlock(&dq_list_lock
);
889 dqstats_inc(DQST_CACHE_HITS
);
890 dqstats_inc(DQST_LOOKUPS
);
892 /* Wait for dq_lock - after this we know that either dquot_release() is
893 * already finished or it will be canceled due to dq_count > 1 test */
894 wait_on_dquot(dquot
);
895 /* Read the dquot / allocate space in quota file */
896 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
899 err
= sb
->dq_op
->acquire_dquot(dquot
);
902 dquot
= ERR_PTR(err
);
907 * Make sure following reads see filled structure - paired with
908 * smp_mb__before_atomic() in dquot_acquire().
911 #ifdef CONFIG_QUOTA_DEBUG
912 BUG_ON(!dquot
->dq_sb
); /* Has somebody invalidated entry under us? */
916 do_destroy_dquot(empty
);
920 EXPORT_SYMBOL(dqget
);
922 static inline struct dquot
**i_dquot(struct inode
*inode
)
924 return inode
->i_sb
->s_op
->get_dquots(inode
);
927 static int dqinit_needed(struct inode
*inode
, int type
)
929 struct dquot
* const *dquots
;
932 if (IS_NOQUOTA(inode
))
935 dquots
= i_dquot(inode
);
937 return !dquots
[type
];
938 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
944 /* This routine is guarded by s_umount semaphore */
945 static int add_dquot_ref(struct super_block
*sb
, int type
)
947 struct inode
*inode
, *old_inode
= NULL
;
948 #ifdef CONFIG_QUOTA_DEBUG
953 spin_lock(&sb
->s_inode_list_lock
);
954 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
955 spin_lock(&inode
->i_lock
);
956 if ((inode
->i_state
& (I_FREEING
|I_WILL_FREE
|I_NEW
)) ||
957 !atomic_read(&inode
->i_writecount
) ||
958 !dqinit_needed(inode
, type
)) {
959 spin_unlock(&inode
->i_lock
);
963 spin_unlock(&inode
->i_lock
);
964 spin_unlock(&sb
->s_inode_list_lock
);
966 #ifdef CONFIG_QUOTA_DEBUG
967 if (unlikely(inode_get_rsv_space(inode
) > 0))
971 err
= __dquot_initialize(inode
, type
);
978 * We hold a reference to 'inode' so it couldn't have been
979 * removed from s_inodes list while we dropped the
980 * s_inode_list_lock. We cannot iput the inode now as we can be
981 * holding the last reference and we cannot iput it under
982 * s_inode_list_lock. So we keep the reference and iput it
987 spin_lock(&sb
->s_inode_list_lock
);
989 spin_unlock(&sb
->s_inode_list_lock
);
992 #ifdef CONFIG_QUOTA_DEBUG
994 quota_error(sb
, "Writes happened before quota was turned on "
995 "thus quota information is probably inconsistent. "
996 "Please run quotacheck(8)");
1003 * Remove references to dquots from inode and add dquot to list for freeing
1004 * if we have the last reference to dquot
1006 static void remove_inode_dquot_ref(struct inode
*inode
, int type
,
1007 struct list_head
*tofree_head
)
1009 struct dquot
**dquots
= i_dquot(inode
);
1010 struct dquot
*dquot
= dquots
[type
];
1015 dquots
[type
] = NULL
;
1016 if (list_empty(&dquot
->dq_free
)) {
1018 * The inode still has reference to dquot so it can't be in the
1021 spin_lock(&dq_list_lock
);
1022 list_add(&dquot
->dq_free
, tofree_head
);
1023 spin_unlock(&dq_list_lock
);
1026 * Dquot is already in a list to put so we won't drop the last
1034 * Free list of dquots
1035 * Dquots are removed from inodes and no new references can be got so we are
1036 * the only ones holding reference
1038 static void put_dquot_list(struct list_head
*tofree_head
)
1040 struct list_head
*act_head
;
1041 struct dquot
*dquot
;
1043 act_head
= tofree_head
->next
;
1044 while (act_head
!= tofree_head
) {
1045 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
1046 act_head
= act_head
->next
;
1047 /* Remove dquot from the list so we won't have problems... */
1048 list_del_init(&dquot
->dq_free
);
1053 static void remove_dquot_ref(struct super_block
*sb
, int type
,
1054 struct list_head
*tofree_head
)
1056 struct inode
*inode
;
1057 #ifdef CONFIG_QUOTA_DEBUG
1061 spin_lock(&sb
->s_inode_list_lock
);
1062 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
1064 * We have to scan also I_NEW inodes because they can already
1065 * have quota pointer initialized. Luckily, we need to touch
1066 * only quota pointers and these have separate locking
1069 spin_lock(&dq_data_lock
);
1070 if (!IS_NOQUOTA(inode
)) {
1071 #ifdef CONFIG_QUOTA_DEBUG
1072 if (unlikely(inode_get_rsv_space(inode
) > 0))
1075 remove_inode_dquot_ref(inode
, type
, tofree_head
);
1077 spin_unlock(&dq_data_lock
);
1079 spin_unlock(&sb
->s_inode_list_lock
);
1080 #ifdef CONFIG_QUOTA_DEBUG
1082 printk(KERN_WARNING
"VFS (%s): Writes happened after quota"
1083 " was disabled thus quota information is probably "
1084 "inconsistent. Please run quotacheck(8).\n", sb
->s_id
);
1089 /* Gather all references from inodes and drop them */
1090 static void drop_dquot_ref(struct super_block
*sb
, int type
)
1092 LIST_HEAD(tofree_head
);
1095 remove_dquot_ref(sb
, type
, &tofree_head
);
1096 synchronize_srcu(&dquot_srcu
);
1097 put_dquot_list(&tofree_head
);
1102 void dquot_free_reserved_space(struct dquot
*dquot
, qsize_t number
)
1104 if (dquot
->dq_dqb
.dqb_rsvspace
>= number
)
1105 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1108 dquot
->dq_dqb
.dqb_rsvspace
= 0;
1110 if (dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
<=
1111 dquot
->dq_dqb
.dqb_bsoftlimit
)
1112 dquot
->dq_dqb
.dqb_btime
= (time64_t
) 0;
1113 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1116 static void dquot_decr_inodes(struct dquot
*dquot
, qsize_t number
)
1118 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1119 dquot
->dq_dqb
.dqb_curinodes
>= number
)
1120 dquot
->dq_dqb
.dqb_curinodes
-= number
;
1122 dquot
->dq_dqb
.dqb_curinodes
= 0;
1123 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1124 dquot
->dq_dqb
.dqb_itime
= (time64_t
) 0;
1125 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
1128 static void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
1130 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1131 dquot
->dq_dqb
.dqb_curspace
>= number
)
1132 dquot
->dq_dqb
.dqb_curspace
-= number
;
1134 dquot
->dq_dqb
.dqb_curspace
= 0;
1135 if (dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
<=
1136 dquot
->dq_dqb
.dqb_bsoftlimit
)
1137 dquot
->dq_dqb
.dqb_btime
= (time64_t
) 0;
1138 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1142 struct super_block
*w_sb
;
1143 struct kqid w_dq_id
;
1147 static int warning_issued(struct dquot
*dquot
, const int warntype
)
1149 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
1150 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
1151 ((warntype
== QUOTA_NL_IHARDWARN
||
1152 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
1156 return test_and_set_bit(flag
, &dquot
->dq_flags
);
1159 #ifdef CONFIG_PRINT_QUOTA_WARNING
1160 static int flag_print_warnings
= 1;
1162 static int need_print_warning(struct dquot_warn
*warn
)
1164 if (!flag_print_warnings
)
1167 switch (warn
->w_dq_id
.type
) {
1169 return uid_eq(current_fsuid(), warn
->w_dq_id
.uid
);
1171 return in_group_p(warn
->w_dq_id
.gid
);
1178 /* Print warning to user which exceeded quota */
1179 static void print_warning(struct dquot_warn
*warn
)
1182 struct tty_struct
*tty
;
1183 int warntype
= warn
->w_type
;
1185 if (warntype
== QUOTA_NL_IHARDBELOW
||
1186 warntype
== QUOTA_NL_ISOFTBELOW
||
1187 warntype
== QUOTA_NL_BHARDBELOW
||
1188 warntype
== QUOTA_NL_BSOFTBELOW
|| !need_print_warning(warn
))
1191 tty
= get_current_tty();
1194 tty_write_message(tty
, warn
->w_sb
->s_id
);
1195 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
1196 tty_write_message(tty
, ": warning, ");
1198 tty_write_message(tty
, ": write failed, ");
1199 tty_write_message(tty
, quotatypes
[warn
->w_dq_id
.type
]);
1201 case QUOTA_NL_IHARDWARN
:
1202 msg
= " file limit reached.\r\n";
1204 case QUOTA_NL_ISOFTLONGWARN
:
1205 msg
= " file quota exceeded too long.\r\n";
1207 case QUOTA_NL_ISOFTWARN
:
1208 msg
= " file quota exceeded.\r\n";
1210 case QUOTA_NL_BHARDWARN
:
1211 msg
= " block limit reached.\r\n";
1213 case QUOTA_NL_BSOFTLONGWARN
:
1214 msg
= " block quota exceeded too long.\r\n";
1216 case QUOTA_NL_BSOFTWARN
:
1217 msg
= " block quota exceeded.\r\n";
1220 tty_write_message(tty
, msg
);
1225 static void prepare_warning(struct dquot_warn
*warn
, struct dquot
*dquot
,
1228 if (warning_issued(dquot
, warntype
))
1230 warn
->w_type
= warntype
;
1231 warn
->w_sb
= dquot
->dq_sb
;
1232 warn
->w_dq_id
= dquot
->dq_id
;
1236 * Write warnings to the console and send warning messages over netlink.
1238 * Note that this function can call into tty and networking code.
1240 static void flush_warnings(struct dquot_warn
*warn
)
1244 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1245 if (warn
[i
].w_type
== QUOTA_NL_NOWARN
)
1247 #ifdef CONFIG_PRINT_QUOTA_WARNING
1248 print_warning(&warn
[i
]);
1250 quota_send_warning(warn
[i
].w_dq_id
,
1251 warn
[i
].w_sb
->s_dev
, warn
[i
].w_type
);
1255 static int ignore_hardlimit(struct dquot
*dquot
)
1257 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
];
1259 return capable(CAP_SYS_RESOURCE
) &&
1260 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
||
1261 !(info
->dqi_flags
& DQF_ROOT_SQUASH
));
1264 static int dquot_add_inodes(struct dquot
*dquot
, qsize_t inodes
,
1265 struct dquot_warn
*warn
)
1270 spin_lock(&dquot
->dq_dqb_lock
);
1271 newinodes
= dquot
->dq_dqb
.dqb_curinodes
+ inodes
;
1272 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_id
.type
) ||
1273 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1276 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1277 newinodes
> dquot
->dq_dqb
.dqb_ihardlimit
&&
1278 !ignore_hardlimit(dquot
)) {
1279 prepare_warning(warn
, dquot
, QUOTA_NL_IHARDWARN
);
1284 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1285 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1286 dquot
->dq_dqb
.dqb_itime
&&
1287 ktime_get_real_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1288 !ignore_hardlimit(dquot
)) {
1289 prepare_warning(warn
, dquot
, QUOTA_NL_ISOFTLONGWARN
);
1294 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1295 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1296 dquot
->dq_dqb
.dqb_itime
== 0) {
1297 prepare_warning(warn
, dquot
, QUOTA_NL_ISOFTWARN
);
1298 dquot
->dq_dqb
.dqb_itime
= ktime_get_real_seconds() +
1299 sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_id
.type
].dqi_igrace
;
1302 dquot
->dq_dqb
.dqb_curinodes
= newinodes
;
1305 spin_unlock(&dquot
->dq_dqb_lock
);
1309 static int dquot_add_space(struct dquot
*dquot
, qsize_t space
,
1310 qsize_t rsv_space
, unsigned int flags
,
1311 struct dquot_warn
*warn
)
1314 struct super_block
*sb
= dquot
->dq_sb
;
1317 spin_lock(&dquot
->dq_dqb_lock
);
1318 if (!sb_has_quota_limits_enabled(sb
, dquot
->dq_id
.type
) ||
1319 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1322 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
1323 + space
+ rsv_space
;
1325 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1326 tspace
> dquot
->dq_dqb
.dqb_bhardlimit
&&
1327 !ignore_hardlimit(dquot
)) {
1328 if (flags
& DQUOT_SPACE_WARN
)
1329 prepare_warning(warn
, dquot
, QUOTA_NL_BHARDWARN
);
1334 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1335 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1336 dquot
->dq_dqb
.dqb_btime
&&
1337 ktime_get_real_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1338 !ignore_hardlimit(dquot
)) {
1339 if (flags
& DQUOT_SPACE_WARN
)
1340 prepare_warning(warn
, dquot
, QUOTA_NL_BSOFTLONGWARN
);
1345 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1346 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1347 dquot
->dq_dqb
.dqb_btime
== 0) {
1348 if (flags
& DQUOT_SPACE_WARN
) {
1349 prepare_warning(warn
, dquot
, QUOTA_NL_BSOFTWARN
);
1350 dquot
->dq_dqb
.dqb_btime
= ktime_get_real_seconds() +
1351 sb_dqopt(sb
)->info
[dquot
->dq_id
.type
].dqi_bgrace
;
1354 * We don't allow preallocation to exceed softlimit so exceeding will
1363 * We have to be careful and go through warning generation & grace time
1364 * setting even if DQUOT_SPACE_NOFAIL is set. That's why we check it
1367 if (flags
& DQUOT_SPACE_NOFAIL
)
1370 dquot
->dq_dqb
.dqb_rsvspace
+= rsv_space
;
1371 dquot
->dq_dqb
.dqb_curspace
+= space
;
1373 spin_unlock(&dquot
->dq_dqb_lock
);
1377 static int info_idq_free(struct dquot
*dquot
, qsize_t inodes
)
1381 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1382 dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
||
1383 !sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_id
.type
))
1384 return QUOTA_NL_NOWARN
;
1386 newinodes
= dquot
->dq_dqb
.dqb_curinodes
- inodes
;
1387 if (newinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1388 return QUOTA_NL_ISOFTBELOW
;
1389 if (dquot
->dq_dqb
.dqb_curinodes
>= dquot
->dq_dqb
.dqb_ihardlimit
&&
1390 newinodes
< dquot
->dq_dqb
.dqb_ihardlimit
)
1391 return QUOTA_NL_IHARDBELOW
;
1392 return QUOTA_NL_NOWARN
;
1395 static int info_bdq_free(struct dquot
*dquot
, qsize_t space
)
1399 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
;
1401 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1402 tspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1403 return QUOTA_NL_NOWARN
;
1405 if (tspace
- space
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1406 return QUOTA_NL_BSOFTBELOW
;
1407 if (tspace
>= dquot
->dq_dqb
.dqb_bhardlimit
&&
1408 tspace
- space
< dquot
->dq_dqb
.dqb_bhardlimit
)
1409 return QUOTA_NL_BHARDBELOW
;
1410 return QUOTA_NL_NOWARN
;
1413 static int dquot_active(const struct inode
*inode
)
1415 struct super_block
*sb
= inode
->i_sb
;
1417 if (IS_NOQUOTA(inode
))
1419 return sb_any_quota_loaded(sb
) & ~sb_any_quota_suspended(sb
);
1423 * Initialize quota pointers in inode
1425 * It is better to call this function outside of any transaction as it
1426 * might need a lot of space in journal for dquot structure allocation.
1428 static int __dquot_initialize(struct inode
*inode
, int type
)
1430 int cnt
, init_needed
= 0;
1431 struct dquot
**dquots
, *got
[MAXQUOTAS
] = {};
1432 struct super_block
*sb
= inode
->i_sb
;
1436 if (!dquot_active(inode
))
1439 dquots
= i_dquot(inode
);
1441 /* First get references to structures we might need. */
1442 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1446 struct dquot
*dquot
;
1448 if (type
!= -1 && cnt
!= type
)
1451 * The i_dquot should have been initialized in most cases,
1452 * we check it without locking here to avoid unnecessary
1453 * dqget()/dqput() calls.
1458 if (!sb_has_quota_active(sb
, cnt
))
1465 qid
= make_kqid_uid(inode
->i_uid
);
1468 qid
= make_kqid_gid(inode
->i_gid
);
1471 rc
= inode
->i_sb
->dq_op
->get_projid(inode
, &projid
);
1474 qid
= make_kqid_projid(projid
);
1477 dquot
= dqget(sb
, qid
);
1478 if (IS_ERR(dquot
)) {
1479 /* We raced with somebody turning quotas off... */
1480 if (PTR_ERR(dquot
) != -ESRCH
) {
1481 ret
= PTR_ERR(dquot
);
1489 /* All required i_dquot has been initialized */
1493 spin_lock(&dq_data_lock
);
1494 if (IS_NOQUOTA(inode
))
1496 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1497 if (type
!= -1 && cnt
!= type
)
1499 /* Avoid races with quotaoff() */
1500 if (!sb_has_quota_active(sb
, cnt
))
1502 /* We could race with quotaon or dqget() could have failed */
1506 dquots
[cnt
] = got
[cnt
];
1509 * Make quota reservation system happy if someone
1510 * did a write before quota was turned on
1512 rsv
= inode_get_rsv_space(inode
);
1513 if (unlikely(rsv
)) {
1514 spin_lock(&inode
->i_lock
);
1515 /* Get reservation again under proper lock */
1516 rsv
= __inode_get_rsv_space(inode
);
1517 spin_lock(&dquots
[cnt
]->dq_dqb_lock
);
1518 dquots
[cnt
]->dq_dqb
.dqb_rsvspace
+= rsv
;
1519 spin_unlock(&dquots
[cnt
]->dq_dqb_lock
);
1520 spin_unlock(&inode
->i_lock
);
1525 spin_unlock(&dq_data_lock
);
1527 /* Drop unused references */
1533 int dquot_initialize(struct inode
*inode
)
1535 return __dquot_initialize(inode
, -1);
1537 EXPORT_SYMBOL(dquot_initialize
);
1539 bool dquot_initialize_needed(struct inode
*inode
)
1541 struct dquot
**dquots
;
1544 if (!dquot_active(inode
))
1547 dquots
= i_dquot(inode
);
1548 for (i
= 0; i
< MAXQUOTAS
; i
++)
1549 if (!dquots
[i
] && sb_has_quota_active(inode
->i_sb
, i
))
1553 EXPORT_SYMBOL(dquot_initialize_needed
);
1556 * Release all quotas referenced by inode.
1558 * This function only be called on inode free or converting
1559 * a file to quota file, no other users for the i_dquot in
1560 * both cases, so we needn't call synchronize_srcu() after
1563 static void __dquot_drop(struct inode
*inode
)
1566 struct dquot
**dquots
= i_dquot(inode
);
1567 struct dquot
*put
[MAXQUOTAS
];
1569 spin_lock(&dq_data_lock
);
1570 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1571 put
[cnt
] = dquots
[cnt
];
1574 spin_unlock(&dq_data_lock
);
1578 void dquot_drop(struct inode
*inode
)
1580 struct dquot
* const *dquots
;
1583 if (IS_NOQUOTA(inode
))
1587 * Test before calling to rule out calls from proc and such
1588 * where we are not allowed to block. Note that this is
1589 * actually reliable test even without the lock - the caller
1590 * must assure that nobody can come after the DQUOT_DROP and
1591 * add quota pointers back anyway.
1593 dquots
= i_dquot(inode
);
1594 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1599 if (cnt
< MAXQUOTAS
)
1600 __dquot_drop(inode
);
1602 EXPORT_SYMBOL(dquot_drop
);
1605 * inode_reserved_space is managed internally by quota, and protected by
1606 * i_lock similar to i_blocks+i_bytes.
1608 static qsize_t
*inode_reserved_space(struct inode
* inode
)
1610 /* Filesystem must explicitly define it's own method in order to use
1611 * quota reservation interface */
1612 BUG_ON(!inode
->i_sb
->dq_op
->get_reserved_space
);
1613 return inode
->i_sb
->dq_op
->get_reserved_space(inode
);
1616 static qsize_t
__inode_get_rsv_space(struct inode
*inode
)
1618 if (!inode
->i_sb
->dq_op
->get_reserved_space
)
1620 return *inode_reserved_space(inode
);
1623 static qsize_t
inode_get_rsv_space(struct inode
*inode
)
1627 if (!inode
->i_sb
->dq_op
->get_reserved_space
)
1629 spin_lock(&inode
->i_lock
);
1630 ret
= __inode_get_rsv_space(inode
);
1631 spin_unlock(&inode
->i_lock
);
1636 * This functions updates i_blocks+i_bytes fields and quota information
1637 * (together with appropriate checks).
1639 * NOTE: We absolutely rely on the fact that caller dirties the inode
1640 * (usually helpers in quotaops.h care about this) and holds a handle for
1641 * the current transaction so that dquot write and inode write go into the
1646 * This operation can block, but only after everything is updated
1648 int __dquot_alloc_space(struct inode
*inode
, qsize_t number
, int flags
)
1650 int cnt
, ret
= 0, index
;
1651 struct dquot_warn warn
[MAXQUOTAS
];
1652 int reserve
= flags
& DQUOT_SPACE_RESERVE
;
1653 struct dquot
**dquots
;
1655 if (!dquot_active(inode
)) {
1657 spin_lock(&inode
->i_lock
);
1658 *inode_reserved_space(inode
) += number
;
1659 spin_unlock(&inode
->i_lock
);
1661 inode_add_bytes(inode
, number
);
1666 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1667 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1669 dquots
= i_dquot(inode
);
1670 index
= srcu_read_lock(&dquot_srcu
);
1671 spin_lock(&inode
->i_lock
);
1672 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1676 ret
= dquot_add_space(dquots
[cnt
], 0, number
, flags
,
1679 ret
= dquot_add_space(dquots
[cnt
], number
, 0, flags
,
1683 /* Back out changes we already did */
1684 for (cnt
--; cnt
>= 0; cnt
--) {
1687 spin_lock(&dquots
[cnt
]->dq_dqb_lock
);
1689 dquot_free_reserved_space(dquots
[cnt
],
1692 dquot_decr_space(dquots
[cnt
], number
);
1693 spin_unlock(&dquots
[cnt
]->dq_dqb_lock
);
1695 spin_unlock(&inode
->i_lock
);
1696 goto out_flush_warn
;
1700 *inode_reserved_space(inode
) += number
;
1702 __inode_add_bytes(inode
, number
);
1703 spin_unlock(&inode
->i_lock
);
1706 goto out_flush_warn
;
1707 mark_all_dquot_dirty(dquots
);
1709 srcu_read_unlock(&dquot_srcu
, index
);
1710 flush_warnings(warn
);
1714 EXPORT_SYMBOL(__dquot_alloc_space
);
1717 * This operation can block, but only after everything is updated
1719 int dquot_alloc_inode(struct inode
*inode
)
1721 int cnt
, ret
= 0, index
;
1722 struct dquot_warn warn
[MAXQUOTAS
];
1723 struct dquot
* const *dquots
;
1725 if (!dquot_active(inode
))
1727 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1728 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1730 dquots
= i_dquot(inode
);
1731 index
= srcu_read_lock(&dquot_srcu
);
1732 spin_lock(&inode
->i_lock
);
1733 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1736 ret
= dquot_add_inodes(dquots
[cnt
], 1, &warn
[cnt
]);
1738 for (cnt
--; cnt
>= 0; cnt
--) {
1741 /* Back out changes we already did */
1742 spin_lock(&dquots
[cnt
]->dq_dqb_lock
);
1743 dquot_decr_inodes(dquots
[cnt
], 1);
1744 spin_unlock(&dquots
[cnt
]->dq_dqb_lock
);
1751 spin_unlock(&inode
->i_lock
);
1753 mark_all_dquot_dirty(dquots
);
1754 srcu_read_unlock(&dquot_srcu
, index
);
1755 flush_warnings(warn
);
1758 EXPORT_SYMBOL(dquot_alloc_inode
);
1761 * Convert in-memory reserved quotas to real consumed quotas
1763 int dquot_claim_space_nodirty(struct inode
*inode
, qsize_t number
)
1765 struct dquot
**dquots
;
1768 if (!dquot_active(inode
)) {
1769 spin_lock(&inode
->i_lock
);
1770 *inode_reserved_space(inode
) -= number
;
1771 __inode_add_bytes(inode
, number
);
1772 spin_unlock(&inode
->i_lock
);
1776 dquots
= i_dquot(inode
);
1777 index
= srcu_read_lock(&dquot_srcu
);
1778 spin_lock(&inode
->i_lock
);
1779 /* Claim reserved quotas to allocated quotas */
1780 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1782 struct dquot
*dquot
= dquots
[cnt
];
1784 spin_lock(&dquot
->dq_dqb_lock
);
1785 if (WARN_ON_ONCE(dquot
->dq_dqb
.dqb_rsvspace
< number
))
1786 number
= dquot
->dq_dqb
.dqb_rsvspace
;
1787 dquot
->dq_dqb
.dqb_curspace
+= number
;
1788 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1789 spin_unlock(&dquot
->dq_dqb_lock
);
1792 /* Update inode bytes */
1793 *inode_reserved_space(inode
) -= number
;
1794 __inode_add_bytes(inode
, number
);
1795 spin_unlock(&inode
->i_lock
);
1796 mark_all_dquot_dirty(dquots
);
1797 srcu_read_unlock(&dquot_srcu
, index
);
1800 EXPORT_SYMBOL(dquot_claim_space_nodirty
);
1803 * Convert allocated space back to in-memory reserved quotas
1805 void dquot_reclaim_space_nodirty(struct inode
*inode
, qsize_t number
)
1807 struct dquot
**dquots
;
1810 if (!dquot_active(inode
)) {
1811 spin_lock(&inode
->i_lock
);
1812 *inode_reserved_space(inode
) += number
;
1813 __inode_sub_bytes(inode
, number
);
1814 spin_unlock(&inode
->i_lock
);
1818 dquots
= i_dquot(inode
);
1819 index
= srcu_read_lock(&dquot_srcu
);
1820 spin_lock(&inode
->i_lock
);
1821 /* Claim reserved quotas to allocated quotas */
1822 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1824 struct dquot
*dquot
= dquots
[cnt
];
1826 spin_lock(&dquot
->dq_dqb_lock
);
1827 if (WARN_ON_ONCE(dquot
->dq_dqb
.dqb_curspace
< number
))
1828 number
= dquot
->dq_dqb
.dqb_curspace
;
1829 dquot
->dq_dqb
.dqb_rsvspace
+= number
;
1830 dquot
->dq_dqb
.dqb_curspace
-= number
;
1831 spin_unlock(&dquot
->dq_dqb_lock
);
1834 /* Update inode bytes */
1835 *inode_reserved_space(inode
) += number
;
1836 __inode_sub_bytes(inode
, number
);
1837 spin_unlock(&inode
->i_lock
);
1838 mark_all_dquot_dirty(dquots
);
1839 srcu_read_unlock(&dquot_srcu
, index
);
1842 EXPORT_SYMBOL(dquot_reclaim_space_nodirty
);
1845 * This operation can block, but only after everything is updated
1847 void __dquot_free_space(struct inode
*inode
, qsize_t number
, int flags
)
1850 struct dquot_warn warn
[MAXQUOTAS
];
1851 struct dquot
**dquots
;
1852 int reserve
= flags
& DQUOT_SPACE_RESERVE
, index
;
1854 if (!dquot_active(inode
)) {
1856 spin_lock(&inode
->i_lock
);
1857 *inode_reserved_space(inode
) -= number
;
1858 spin_unlock(&inode
->i_lock
);
1860 inode_sub_bytes(inode
, number
);
1865 dquots
= i_dquot(inode
);
1866 index
= srcu_read_lock(&dquot_srcu
);
1867 spin_lock(&inode
->i_lock
);
1868 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1871 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1874 spin_lock(&dquots
[cnt
]->dq_dqb_lock
);
1875 wtype
= info_bdq_free(dquots
[cnt
], number
);
1876 if (wtype
!= QUOTA_NL_NOWARN
)
1877 prepare_warning(&warn
[cnt
], dquots
[cnt
], wtype
);
1879 dquot_free_reserved_space(dquots
[cnt
], number
);
1881 dquot_decr_space(dquots
[cnt
], number
);
1882 spin_unlock(&dquots
[cnt
]->dq_dqb_lock
);
1885 *inode_reserved_space(inode
) -= number
;
1887 __inode_sub_bytes(inode
, number
);
1888 spin_unlock(&inode
->i_lock
);
1892 mark_all_dquot_dirty(dquots
);
1894 srcu_read_unlock(&dquot_srcu
, index
);
1895 flush_warnings(warn
);
1897 EXPORT_SYMBOL(__dquot_free_space
);
1900 * This operation can block, but only after everything is updated
1902 void dquot_free_inode(struct inode
*inode
)
1905 struct dquot_warn warn
[MAXQUOTAS
];
1906 struct dquot
* const *dquots
;
1909 if (!dquot_active(inode
))
1912 dquots
= i_dquot(inode
);
1913 index
= srcu_read_lock(&dquot_srcu
);
1914 spin_lock(&inode
->i_lock
);
1915 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1918 warn
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1921 spin_lock(&dquots
[cnt
]->dq_dqb_lock
);
1922 wtype
= info_idq_free(dquots
[cnt
], 1);
1923 if (wtype
!= QUOTA_NL_NOWARN
)
1924 prepare_warning(&warn
[cnt
], dquots
[cnt
], wtype
);
1925 dquot_decr_inodes(dquots
[cnt
], 1);
1926 spin_unlock(&dquots
[cnt
]->dq_dqb_lock
);
1928 spin_unlock(&inode
->i_lock
);
1929 mark_all_dquot_dirty(dquots
);
1930 srcu_read_unlock(&dquot_srcu
, index
);
1931 flush_warnings(warn
);
1933 EXPORT_SYMBOL(dquot_free_inode
);
1936 * Transfer the number of inode and blocks from one diskquota to an other.
1937 * On success, dquot references in transfer_to are consumed and references
1938 * to original dquots that need to be released are placed there. On failure,
1939 * references are kept untouched.
1941 * This operation can block, but only after everything is updated
1942 * A transaction must be started when entering this function.
1944 * We are holding reference on transfer_from & transfer_to, no need to
1945 * protect them by srcu_read_lock().
1947 int __dquot_transfer(struct inode
*inode
, struct dquot
**transfer_to
)
1950 qsize_t rsv_space
= 0;
1951 qsize_t inode_usage
= 1;
1952 struct dquot
*transfer_from
[MAXQUOTAS
] = {};
1954 char is_valid
[MAXQUOTAS
] = {};
1955 struct dquot_warn warn_to
[MAXQUOTAS
];
1956 struct dquot_warn warn_from_inodes
[MAXQUOTAS
];
1957 struct dquot_warn warn_from_space
[MAXQUOTAS
];
1959 if (IS_NOQUOTA(inode
))
1962 if (inode
->i_sb
->dq_op
->get_inode_usage
) {
1963 ret
= inode
->i_sb
->dq_op
->get_inode_usage(inode
, &inode_usage
);
1968 /* Initialize the arrays */
1969 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1970 warn_to
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1971 warn_from_inodes
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1972 warn_from_space
[cnt
].w_type
= QUOTA_NL_NOWARN
;
1975 spin_lock(&dq_data_lock
);
1976 spin_lock(&inode
->i_lock
);
1977 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1978 spin_unlock(&inode
->i_lock
);
1979 spin_unlock(&dq_data_lock
);
1982 cur_space
= __inode_get_bytes(inode
);
1983 rsv_space
= __inode_get_rsv_space(inode
);
1985 * Build the transfer_from list, check limits, and update usage in
1986 * the target structures.
1988 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1990 * Skip changes for same uid or gid or for turned off quota-type.
1992 if (!transfer_to
[cnt
])
1994 /* Avoid races with quotaoff() */
1995 if (!sb_has_quota_active(inode
->i_sb
, cnt
))
1998 transfer_from
[cnt
] = i_dquot(inode
)[cnt
];
1999 ret
= dquot_add_inodes(transfer_to
[cnt
], inode_usage
,
2003 ret
= dquot_add_space(transfer_to
[cnt
], cur_space
, rsv_space
,
2004 DQUOT_SPACE_WARN
, &warn_to
[cnt
]);
2006 spin_lock(&transfer_to
[cnt
]->dq_dqb_lock
);
2007 dquot_decr_inodes(transfer_to
[cnt
], inode_usage
);
2008 spin_unlock(&transfer_to
[cnt
]->dq_dqb_lock
);
2013 /* Decrease usage for source structures and update quota pointers */
2014 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2017 /* Due to IO error we might not have transfer_from[] structure */
2018 if (transfer_from
[cnt
]) {
2021 spin_lock(&transfer_from
[cnt
]->dq_dqb_lock
);
2022 wtype
= info_idq_free(transfer_from
[cnt
], inode_usage
);
2023 if (wtype
!= QUOTA_NL_NOWARN
)
2024 prepare_warning(&warn_from_inodes
[cnt
],
2025 transfer_from
[cnt
], wtype
);
2026 wtype
= info_bdq_free(transfer_from
[cnt
],
2027 cur_space
+ rsv_space
);
2028 if (wtype
!= QUOTA_NL_NOWARN
)
2029 prepare_warning(&warn_from_space
[cnt
],
2030 transfer_from
[cnt
], wtype
);
2031 dquot_decr_inodes(transfer_from
[cnt
], inode_usage
);
2032 dquot_decr_space(transfer_from
[cnt
], cur_space
);
2033 dquot_free_reserved_space(transfer_from
[cnt
],
2035 spin_unlock(&transfer_from
[cnt
]->dq_dqb_lock
);
2037 i_dquot(inode
)[cnt
] = transfer_to
[cnt
];
2039 spin_unlock(&inode
->i_lock
);
2040 spin_unlock(&dq_data_lock
);
2042 mark_all_dquot_dirty(transfer_from
);
2043 mark_all_dquot_dirty(transfer_to
);
2044 flush_warnings(warn_to
);
2045 flush_warnings(warn_from_inodes
);
2046 flush_warnings(warn_from_space
);
2047 /* Pass back references to put */
2048 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2050 transfer_to
[cnt
] = transfer_from
[cnt
];
2053 /* Back out changes we already did */
2054 for (cnt
--; cnt
>= 0; cnt
--) {
2057 spin_lock(&transfer_to
[cnt
]->dq_dqb_lock
);
2058 dquot_decr_inodes(transfer_to
[cnt
], inode_usage
);
2059 dquot_decr_space(transfer_to
[cnt
], cur_space
);
2060 dquot_free_reserved_space(transfer_to
[cnt
], rsv_space
);
2061 spin_unlock(&transfer_to
[cnt
]->dq_dqb_lock
);
2063 spin_unlock(&inode
->i_lock
);
2064 spin_unlock(&dq_data_lock
);
2065 flush_warnings(warn_to
);
2068 EXPORT_SYMBOL(__dquot_transfer
);
2070 /* Wrapper for transferring ownership of an inode for uid/gid only
2071 * Called from FSXXX_setattr()
2073 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
2075 struct dquot
*transfer_to
[MAXQUOTAS
] = {};
2076 struct dquot
*dquot
;
2077 struct super_block
*sb
= inode
->i_sb
;
2080 if (!dquot_active(inode
))
2083 if (iattr
->ia_valid
& ATTR_UID
&& !uid_eq(iattr
->ia_uid
, inode
->i_uid
)){
2084 dquot
= dqget(sb
, make_kqid_uid(iattr
->ia_uid
));
2085 if (IS_ERR(dquot
)) {
2086 if (PTR_ERR(dquot
) != -ESRCH
) {
2087 ret
= PTR_ERR(dquot
);
2092 transfer_to
[USRQUOTA
] = dquot
;
2094 if (iattr
->ia_valid
& ATTR_GID
&& !gid_eq(iattr
->ia_gid
, inode
->i_gid
)){
2095 dquot
= dqget(sb
, make_kqid_gid(iattr
->ia_gid
));
2096 if (IS_ERR(dquot
)) {
2097 if (PTR_ERR(dquot
) != -ESRCH
) {
2098 ret
= PTR_ERR(dquot
);
2103 transfer_to
[GRPQUOTA
] = dquot
;
2105 ret
= __dquot_transfer(inode
, transfer_to
);
2107 dqput_all(transfer_to
);
2110 EXPORT_SYMBOL(dquot_transfer
);
2113 * Write info of quota file to disk
2115 int dquot_commit_info(struct super_block
*sb
, int type
)
2117 struct quota_info
*dqopt
= sb_dqopt(sb
);
2119 return dqopt
->ops
[type
]->write_file_info(sb
, type
);
2121 EXPORT_SYMBOL(dquot_commit_info
);
2123 int dquot_get_next_id(struct super_block
*sb
, struct kqid
*qid
)
2125 struct quota_info
*dqopt
= sb_dqopt(sb
);
2127 if (!sb_has_quota_active(sb
, qid
->type
))
2129 if (!dqopt
->ops
[qid
->type
]->get_next_id
)
2131 return dqopt
->ops
[qid
->type
]->get_next_id(sb
, qid
);
2133 EXPORT_SYMBOL(dquot_get_next_id
);
2136 * Definitions of diskquota operations.
2138 const struct dquot_operations dquot_operations
= {
2139 .write_dquot
= dquot_commit
,
2140 .acquire_dquot
= dquot_acquire
,
2141 .release_dquot
= dquot_release
,
2142 .mark_dirty
= dquot_mark_dquot_dirty
,
2143 .write_info
= dquot_commit_info
,
2144 .alloc_dquot
= dquot_alloc
,
2145 .destroy_dquot
= dquot_destroy
,
2146 .get_next_id
= dquot_get_next_id
,
2148 EXPORT_SYMBOL(dquot_operations
);
2151 * Generic helper for ->open on filesystems supporting disk quotas.
2153 int dquot_file_open(struct inode
*inode
, struct file
*file
)
2157 error
= generic_file_open(inode
, file
);
2158 if (!error
&& (file
->f_mode
& FMODE_WRITE
))
2159 error
= dquot_initialize(inode
);
2162 EXPORT_SYMBOL(dquot_file_open
);
2164 static void vfs_cleanup_quota_inode(struct super_block
*sb
, int type
)
2166 struct quota_info
*dqopt
= sb_dqopt(sb
);
2167 struct inode
*inode
= dqopt
->files
[type
];
2171 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2173 inode
->i_flags
&= ~S_NOQUOTA
;
2174 inode_unlock(inode
);
2176 dqopt
->files
[type
] = NULL
;
2181 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
2183 int dquot_disable(struct super_block
*sb
, int type
, unsigned int flags
)
2186 struct quota_info
*dqopt
= sb_dqopt(sb
);
2188 /* s_umount should be held in exclusive mode */
2189 if (WARN_ON_ONCE(down_read_trylock(&sb
->s_umount
)))
2190 up_read(&sb
->s_umount
);
2192 /* Cannot turn off usage accounting without turning off limits, or
2193 * suspend quotas and simultaneously turn quotas off. */
2194 if ((flags
& DQUOT_USAGE_ENABLED
&& !(flags
& DQUOT_LIMITS_ENABLED
))
2195 || (flags
& DQUOT_SUSPENDED
&& flags
& (DQUOT_LIMITS_ENABLED
|
2196 DQUOT_USAGE_ENABLED
)))
2200 * Skip everything if there's nothing to do. We have to do this because
2201 * sometimes we are called when fill_super() failed and calling
2202 * sync_fs() in such cases does no good.
2204 if (!sb_any_quota_loaded(sb
))
2207 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2208 if (type
!= -1 && cnt
!= type
)
2210 if (!sb_has_quota_loaded(sb
, cnt
))
2213 if (flags
& DQUOT_SUSPENDED
) {
2214 spin_lock(&dq_state_lock
);
2216 dquot_state_flag(DQUOT_SUSPENDED
, cnt
);
2217 spin_unlock(&dq_state_lock
);
2219 spin_lock(&dq_state_lock
);
2220 dqopt
->flags
&= ~dquot_state_flag(flags
, cnt
);
2221 /* Turning off suspended quotas? */
2222 if (!sb_has_quota_loaded(sb
, cnt
) &&
2223 sb_has_quota_suspended(sb
, cnt
)) {
2224 dqopt
->flags
&= ~dquot_state_flag(
2225 DQUOT_SUSPENDED
, cnt
);
2226 spin_unlock(&dq_state_lock
);
2227 vfs_cleanup_quota_inode(sb
, cnt
);
2230 spin_unlock(&dq_state_lock
);
2233 /* We still have to keep quota loaded? */
2234 if (sb_has_quota_loaded(sb
, cnt
) && !(flags
& DQUOT_SUSPENDED
))
2237 /* Note: these are blocking operations */
2238 drop_dquot_ref(sb
, cnt
);
2239 invalidate_dquots(sb
, cnt
);
2241 * Now all dquots should be invalidated, all writes done so we
2242 * should be only users of the info. No locks needed.
2244 if (info_dirty(&dqopt
->info
[cnt
]))
2245 sb
->dq_op
->write_info(sb
, cnt
);
2246 if (dqopt
->ops
[cnt
]->free_file_info
)
2247 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
2248 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
2249 dqopt
->info
[cnt
].dqi_flags
= 0;
2250 dqopt
->info
[cnt
].dqi_igrace
= 0;
2251 dqopt
->info
[cnt
].dqi_bgrace
= 0;
2252 dqopt
->ops
[cnt
] = NULL
;
2255 /* Skip syncing and setting flags if quota files are hidden */
2256 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
2259 /* Sync the superblock so that buffers with quota data are written to
2260 * disk (and so userspace sees correct data afterwards). */
2261 if (sb
->s_op
->sync_fs
)
2262 sb
->s_op
->sync_fs(sb
, 1);
2263 sync_blockdev(sb
->s_bdev
);
2264 /* Now the quota files are just ordinary files and we can set the
2265 * inode flags back. Moreover we discard the pagecache so that
2266 * userspace sees the writes we did bypassing the pagecache. We
2267 * must also discard the blockdev buffers so that we see the
2268 * changes done by userspace on the next quotaon() */
2269 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2270 if (!sb_has_quota_loaded(sb
, cnt
) && dqopt
->files
[cnt
]) {
2271 inode_lock(dqopt
->files
[cnt
]);
2272 truncate_inode_pages(&dqopt
->files
[cnt
]->i_data
, 0);
2273 inode_unlock(dqopt
->files
[cnt
]);
2276 invalidate_bdev(sb
->s_bdev
);
2278 /* We are done when suspending quotas */
2279 if (flags
& DQUOT_SUSPENDED
)
2282 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
2283 if (!sb_has_quota_loaded(sb
, cnt
))
2284 vfs_cleanup_quota_inode(sb
, cnt
);
2287 EXPORT_SYMBOL(dquot_disable
);
2289 int dquot_quota_off(struct super_block
*sb
, int type
)
2291 return dquot_disable(sb
, type
,
2292 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2294 EXPORT_SYMBOL(dquot_quota_off
);
2297 * Turn quotas on on a device
2300 static int vfs_setup_quota_inode(struct inode
*inode
, int type
)
2302 struct super_block
*sb
= inode
->i_sb
;
2303 struct quota_info
*dqopt
= sb_dqopt(sb
);
2305 if (!S_ISREG(inode
->i_mode
))
2307 if (IS_RDONLY(inode
))
2309 if (sb_has_quota_loaded(sb
, type
))
2312 dqopt
->files
[type
] = igrab(inode
);
2313 if (!dqopt
->files
[type
])
2315 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2316 /* We don't want quota and atime on quota files (deadlocks
2317 * possible) Also nobody should write to the file - we use
2318 * special IO operations which ignore the immutable bit. */
2320 inode
->i_flags
|= S_NOQUOTA
;
2321 inode_unlock(inode
);
2323 * When S_NOQUOTA is set, remove dquot references as no more
2324 * references can be added
2326 __dquot_drop(inode
);
2331 int dquot_load_quota_sb(struct super_block
*sb
, int type
, int format_id
,
2334 struct quota_format_type
*fmt
= find_quota_format(format_id
);
2335 struct quota_info
*dqopt
= sb_dqopt(sb
);
2338 /* Just unsuspend quotas? */
2339 BUG_ON(flags
& DQUOT_SUSPENDED
);
2340 /* s_umount should be held in exclusive mode */
2341 if (WARN_ON_ONCE(down_read_trylock(&sb
->s_umount
)))
2342 up_read(&sb
->s_umount
);
2346 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
||
2347 (type
== PRJQUOTA
&& sb
->dq_op
->get_projid
== NULL
)) {
2351 /* Filesystems outside of init_user_ns not yet supported */
2352 if (sb
->s_user_ns
!= &init_user_ns
) {
2356 /* Usage always has to be set... */
2357 if (!(flags
& DQUOT_USAGE_ENABLED
)) {
2361 if (sb_has_quota_loaded(sb
, type
)) {
2366 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2367 /* As we bypass the pagecache we must now flush all the
2368 * dirty data and invalidate caches so that kernel sees
2369 * changes from userspace. It is not enough to just flush
2370 * the quota file since if blocksize < pagesize, invalidation
2371 * of the cache could fail because of other unrelated dirty
2373 sync_filesystem(sb
);
2374 invalidate_bdev(sb
->s_bdev
);
2378 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
2381 dqopt
->ops
[type
] = fmt
->qf_ops
;
2382 dqopt
->info
[type
].dqi_format
= fmt
;
2383 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
2384 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
2385 error
= dqopt
->ops
[type
]->read_file_info(sb
, type
);
2388 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
) {
2389 spin_lock(&dq_data_lock
);
2390 dqopt
->info
[type
].dqi_flags
|= DQF_SYS_FILE
;
2391 spin_unlock(&dq_data_lock
);
2393 spin_lock(&dq_state_lock
);
2394 dqopt
->flags
|= dquot_state_flag(flags
, type
);
2395 spin_unlock(&dq_state_lock
);
2397 error
= add_dquot_ref(sb
, type
);
2399 dquot_disable(sb
, type
, flags
);
2403 put_quota_format(fmt
);
2407 EXPORT_SYMBOL(dquot_load_quota_sb
);
2410 * More powerful function for turning on quotas on given quota inode allowing
2411 * setting of individual quota flags
2413 int dquot_load_quota_inode(struct inode
*inode
, int type
, int format_id
,
2418 err
= vfs_setup_quota_inode(inode
, type
);
2421 err
= dquot_load_quota_sb(inode
->i_sb
, type
, format_id
, flags
);
2423 vfs_cleanup_quota_inode(inode
->i_sb
, type
);
2426 EXPORT_SYMBOL(dquot_load_quota_inode
);
2428 /* Reenable quotas on remount RW */
2429 int dquot_resume(struct super_block
*sb
, int type
)
2431 struct quota_info
*dqopt
= sb_dqopt(sb
);
2435 /* s_umount should be held in exclusive mode */
2436 if (WARN_ON_ONCE(down_read_trylock(&sb
->s_umount
)))
2437 up_read(&sb
->s_umount
);
2439 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2440 if (type
!= -1 && cnt
!= type
)
2442 if (!sb_has_quota_suspended(sb
, cnt
))
2445 spin_lock(&dq_state_lock
);
2446 flags
= dqopt
->flags
& dquot_state_flag(DQUOT_USAGE_ENABLED
|
2447 DQUOT_LIMITS_ENABLED
,
2449 dqopt
->flags
&= ~dquot_state_flag(DQUOT_STATE_FLAGS
, cnt
);
2450 spin_unlock(&dq_state_lock
);
2452 flags
= dquot_generic_flag(flags
, cnt
);
2453 ret
= dquot_load_quota_sb(sb
, cnt
, dqopt
->info
[cnt
].dqi_fmt_id
,
2456 vfs_cleanup_quota_inode(sb
, cnt
);
2461 EXPORT_SYMBOL(dquot_resume
);
2463 int dquot_quota_on(struct super_block
*sb
, int type
, int format_id
,
2464 const struct path
*path
)
2466 int error
= security_quota_on(path
->dentry
);
2469 /* Quota file not on the same filesystem? */
2470 if (path
->dentry
->d_sb
!= sb
)
2473 error
= dquot_load_quota_inode(d_inode(path
->dentry
), type
,
2474 format_id
, DQUOT_USAGE_ENABLED
|
2475 DQUOT_LIMITS_ENABLED
);
2478 EXPORT_SYMBOL(dquot_quota_on
);
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_positive_unlocked(qf_name
, sb
->s_root
, strlen(qf_name
));
2492 return PTR_ERR(dentry
);
2494 error
= security_quota_on(dentry
);
2496 error
= dquot_load_quota_inode(d_inode(dentry
), type
, format_id
,
2497 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2502 EXPORT_SYMBOL(dquot_quota_on_mount
);
2504 static int dquot_quota_enable(struct super_block
*sb
, unsigned int flags
)
2508 struct quota_info
*dqopt
= sb_dqopt(sb
);
2510 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
))
2512 /* Accounting cannot be turned on while fs is mounted */
2513 flags
&= ~(FS_QUOTA_UDQ_ACCT
| FS_QUOTA_GDQ_ACCT
| FS_QUOTA_PDQ_ACCT
);
2516 for (type
= 0; type
< MAXQUOTAS
; type
++) {
2517 if (!(flags
& qtype_enforce_flag(type
)))
2519 /* Can't enforce without accounting */
2520 if (!sb_has_quota_usage_enabled(sb
, type
)) {
2524 if (sb_has_quota_limits_enabled(sb
, type
)) {
2528 spin_lock(&dq_state_lock
);
2529 dqopt
->flags
|= dquot_state_flag(DQUOT_LIMITS_ENABLED
, type
);
2530 spin_unlock(&dq_state_lock
);
2534 /* Backout enforcement enablement we already did */
2535 for (type
--; type
>= 0; type
--) {
2536 if (flags
& qtype_enforce_flag(type
))
2537 dquot_disable(sb
, type
, DQUOT_LIMITS_ENABLED
);
2539 /* Error code translation for better compatibility with XFS */
2545 static int dquot_quota_disable(struct super_block
*sb
, unsigned int flags
)
2549 struct quota_info
*dqopt
= sb_dqopt(sb
);
2551 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
))
2554 * We don't support turning off accounting via quotactl. In principle
2555 * quota infrastructure can do this but filesystems don't expect
2556 * userspace to be able to do it.
2559 (FS_QUOTA_UDQ_ACCT
| FS_QUOTA_GDQ_ACCT
| FS_QUOTA_PDQ_ACCT
))
2562 /* Filter out limits not enabled */
2563 for (type
= 0; type
< MAXQUOTAS
; type
++)
2564 if (!sb_has_quota_limits_enabled(sb
, type
))
2565 flags
&= ~qtype_enforce_flag(type
);
2569 for (type
= 0; type
< MAXQUOTAS
; type
++) {
2570 if (flags
& qtype_enforce_flag(type
)) {
2571 ret
= dquot_disable(sb
, type
, DQUOT_LIMITS_ENABLED
);
2578 /* Backout enforcement disabling we already did */
2579 for (type
--; type
>= 0; type
--) {
2580 if (flags
& qtype_enforce_flag(type
)) {
2581 spin_lock(&dq_state_lock
);
2583 dquot_state_flag(DQUOT_LIMITS_ENABLED
, type
);
2584 spin_unlock(&dq_state_lock
);
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 if (dqopt
->files
[type
]) {
2784 tstate
->ino
= dqopt
->files
[type
]->i_ino
;
2785 tstate
->blocks
= dqopt
->files
[type
]->i_blocks
;
2787 tstate
->nextents
= 1; /* We don't know... */
2788 spin_unlock(&dq_data_lock
);
2792 EXPORT_SYMBOL(dquot_get_state
);
2794 /* Generic routine for setting common part of quota file information */
2795 int dquot_set_dqinfo(struct super_block
*sb
, int type
, struct qc_info
*ii
)
2797 struct mem_dqinfo
*mi
;
2800 if ((ii
->i_fieldmask
& QC_WARNS_MASK
) ||
2801 (ii
->i_fieldmask
& QC_RT_SPC_TIMER
))
2803 if (!sb_has_quota_active(sb
, type
))
2805 mi
= sb_dqopt(sb
)->info
+ type
;
2806 if (ii
->i_fieldmask
& QC_FLAGS
) {
2807 if ((ii
->i_flags
& QCI_ROOT_SQUASH
&&
2808 mi
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
))
2811 spin_lock(&dq_data_lock
);
2812 if (ii
->i_fieldmask
& QC_SPC_TIMER
)
2813 mi
->dqi_bgrace
= ii
->i_spc_timelimit
;
2814 if (ii
->i_fieldmask
& QC_INO_TIMER
)
2815 mi
->dqi_igrace
= ii
->i_ino_timelimit
;
2816 if (ii
->i_fieldmask
& QC_FLAGS
) {
2817 if (ii
->i_flags
& QCI_ROOT_SQUASH
)
2818 mi
->dqi_flags
|= DQF_ROOT_SQUASH
;
2820 mi
->dqi_flags
&= ~DQF_ROOT_SQUASH
;
2822 spin_unlock(&dq_data_lock
);
2823 mark_info_dirty(sb
, type
);
2824 /* Force write to disk */
2825 sb
->dq_op
->write_info(sb
, type
);
2828 EXPORT_SYMBOL(dquot_set_dqinfo
);
2830 const struct quotactl_ops dquot_quotactl_sysfile_ops
= {
2831 .quota_enable
= dquot_quota_enable
,
2832 .quota_disable
= dquot_quota_disable
,
2833 .quota_sync
= dquot_quota_sync
,
2834 .get_state
= dquot_get_state
,
2835 .set_info
= dquot_set_dqinfo
,
2836 .get_dqblk
= dquot_get_dqblk
,
2837 .get_nextdqblk
= dquot_get_next_dqblk
,
2838 .set_dqblk
= dquot_set_dqblk
2840 EXPORT_SYMBOL(dquot_quotactl_sysfile_ops
);
2842 static int do_proc_dqstats(struct ctl_table
*table
, int write
,
2843 void *buffer
, size_t *lenp
, loff_t
*ppos
)
2845 unsigned int type
= (unsigned long *)table
->data
- dqstats
.stat
;
2846 s64 value
= percpu_counter_sum(&dqstats
.counter
[type
]);
2848 /* Filter negative values for non-monotonic counters */
2849 if (value
< 0 && (type
== DQST_ALLOC_DQUOTS
||
2850 type
== DQST_FREE_DQUOTS
))
2853 /* Update global table */
2854 dqstats
.stat
[type
] = value
;
2855 return proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2858 static struct ctl_table fs_dqstats_table
[] = {
2860 .procname
= "lookups",
2861 .data
= &dqstats
.stat
[DQST_LOOKUPS
],
2862 .maxlen
= sizeof(unsigned long),
2864 .proc_handler
= do_proc_dqstats
,
2867 .procname
= "drops",
2868 .data
= &dqstats
.stat
[DQST_DROPS
],
2869 .maxlen
= sizeof(unsigned long),
2871 .proc_handler
= do_proc_dqstats
,
2874 .procname
= "reads",
2875 .data
= &dqstats
.stat
[DQST_READS
],
2876 .maxlen
= sizeof(unsigned long),
2878 .proc_handler
= do_proc_dqstats
,
2881 .procname
= "writes",
2882 .data
= &dqstats
.stat
[DQST_WRITES
],
2883 .maxlen
= sizeof(unsigned long),
2885 .proc_handler
= do_proc_dqstats
,
2888 .procname
= "cache_hits",
2889 .data
= &dqstats
.stat
[DQST_CACHE_HITS
],
2890 .maxlen
= sizeof(unsigned long),
2892 .proc_handler
= do_proc_dqstats
,
2895 .procname
= "allocated_dquots",
2896 .data
= &dqstats
.stat
[DQST_ALLOC_DQUOTS
],
2897 .maxlen
= sizeof(unsigned long),
2899 .proc_handler
= do_proc_dqstats
,
2902 .procname
= "free_dquots",
2903 .data
= &dqstats
.stat
[DQST_FREE_DQUOTS
],
2904 .maxlen
= sizeof(unsigned long),
2906 .proc_handler
= do_proc_dqstats
,
2909 .procname
= "syncs",
2910 .data
= &dqstats
.stat
[DQST_SYNCS
],
2911 .maxlen
= sizeof(unsigned long),
2913 .proc_handler
= do_proc_dqstats
,
2915 #ifdef CONFIG_PRINT_QUOTA_WARNING
2917 .procname
= "warnings",
2918 .data
= &flag_print_warnings
,
2919 .maxlen
= sizeof(int),
2921 .proc_handler
= proc_dointvec
,
2927 static struct ctl_table fs_table
[] = {
2929 .procname
= "quota",
2931 .child
= fs_dqstats_table
,
2936 static struct ctl_table sys_table
[] = {
2945 static int __init
dquot_init(void)
2948 unsigned long nr_hash
, order
;
2950 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2952 register_sysctl_table(sys_table
);
2954 dquot_cachep
= kmem_cache_create("dquot",
2955 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2956 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2957 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2961 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_KERNEL
, order
);
2963 panic("Cannot create dquot hash table");
2965 for (i
= 0; i
< _DQST_DQSTAT_LAST
; i
++) {
2966 ret
= percpu_counter_init(&dqstats
.counter
[i
], 0, GFP_KERNEL
);
2968 panic("Cannot create dquot stat counters");
2971 /* Find power-of-two hlist_heads which can fit into allocation */
2972 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2973 dq_hash_bits
= ilog2(nr_hash
);
2975 nr_hash
= 1UL << dq_hash_bits
;
2976 dq_hash_mask
= nr_hash
- 1;
2977 for (i
= 0; i
< nr_hash
; i
++)
2978 INIT_HLIST_HEAD(dquot_hash
+ i
);
2980 pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld,"
2981 " %ld bytes)\n", nr_hash
, order
, (PAGE_SIZE
<< order
));
2983 if (register_shrinker(&dqcache_shrinker
))
2984 panic("Cannot register dquot shrinker");
2988 fs_initcall(dquot_init
);