2 * Implementation of the diskquota system for the LINUX operating system. QUOTA
3 * is implemented using the BSD system call interface as the means of
4 * communication with the user level. This file contains the generic routines
5 * called by the different filesystems on allocation of an inode or block.
6 * These routines take care of the administration needed to have a consistent
7 * diskquota tracking system. The ideas of both user and group quotas are based
8 * on the Melbourne quota system as used on BSD derived systems. The internal
9 * implementation is based on one of the several variants of the LINUX
10 * inode-subsystem with added complexity of the diskquota system.
12 * Author: Marco van Wieringen <mvw@planets.elm.net>
14 * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
16 * Revised list management to avoid races
17 * -- Bill Hawes, <whawes@star.net>, 9/98
19 * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
20 * As the consequence the locking was moved from dquot_decr_...(),
21 * dquot_incr_...() to calling functions.
22 * invalidate_dquots() now writes modified dquots.
23 * Serialized quota_off() and quota_on() for mount point.
24 * Fixed a few bugs in grow_dquots().
25 * Fixed deadlock in write_dquot() - we no longer account quotas on
27 * remove_dquot_ref() moved to inode.c - it now traverses through inodes
28 * add_dquot_ref() restarts after blocking
29 * Added check for bogus uid and fixed check for group in quotactl.
30 * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
32 * Used struct list_head instead of own list struct
33 * Invalidation of referenced dquots is no longer possible
34 * Improved free_dquots list management
35 * Quota and i_blocks are now updated in one place to avoid races
36 * Warnings are now delayed so we won't block in critical section
37 * Write updated not to require dquot lock
38 * Jan Kara, <jack@suse.cz>, 9/2000
40 * Added dynamic quota structure allocation
41 * Jan Kara <jack@suse.cz> 12/2000
43 * Rewritten quota interface. Implemented new quota format and
44 * formats registering.
45 * Jan Kara, <jack@suse.cz>, 2001,2002
48 * Jan Kara, <jack@suse.cz>, 10/2002
50 * Added journalled quota support, fix lock inversion problems
51 * Jan Kara, <jack@suse.cz>, 2003,2004
53 * (C) Copyright 1994 - 1997 Marco van Wieringen
56 #include <linux/errno.h>
57 #include <linux/kernel.h>
59 #include <linux/mount.h>
61 #include <linux/time.h>
62 #include <linux/types.h>
63 #include <linux/string.h>
64 #include <linux/fcntl.h>
65 #include <linux/stat.h>
66 #include <linux/tty.h>
67 #include <linux/file.h>
68 #include <linux/slab.h>
69 #include <linux/sysctl.h>
70 #include <linux/init.h>
71 #include <linux/module.h>
72 #include <linux/proc_fs.h>
73 #include <linux/security.h>
74 #include <linux/kmod.h>
75 #include <linux/namei.h>
76 #include <linux/buffer_head.h>
77 #include <linux/capability.h>
78 #include <linux/quotaops.h>
79 #include <linux/writeback.h> /* for inode_lock, oddly enough.. */
81 #include <asm/uaccess.h>
83 #define __DQUOT_PARANOIA
86 * There are three quota SMP locks. dq_list_lock protects all lists with quotas
87 * and quota formats, dqstats structure containing statistics about the lists
88 * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
89 * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
90 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
91 * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
92 * modifications of quota state (on quotaon and quotaoff) and readers who care
93 * about latest values take it as well.
95 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
96 * dq_list_lock > dq_state_lock
98 * Note that some things (eg. sb pointer, type, id) doesn't change during
99 * the life of the dquot structure and so needn't to be protected by a lock
101 * Any operation working on dquots via inode pointers must hold dqptr_sem. If
102 * operation is just reading pointers from inode (or not using them at all) the
103 * read lock is enough. If pointers are altered function must hold write lock
104 * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
105 * for altering the flag i_mutex is also needed).
107 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
108 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
109 * Currently dquot is locked only when it is being read to memory (or space for
110 * it is being allocated) on the first dqget() and when it is being released on
111 * the last dqput(). The allocation and release oparations are serialized by
112 * the dq_lock and by checking the use count in dquot_release(). Write
113 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
114 * spinlock to internal buffers before writing.
116 * Lock ordering (including related VFS locks) is the following:
117 * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
119 * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
120 * dqptr_sem. But filesystem has to count with the fact that functions such as
121 * dquot_alloc_space() acquire dqptr_sem and they usually have to be called
122 * from inside a transaction to keep filesystem consistency after a crash. Also
123 * filesystems usually want to do some IO on dquot from ->mark_dirty which is
124 * called with dqptr_sem held.
125 * i_mutex on quota files is special (it's below dqio_mutex)
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
);
133 static char *quotatypes
[] = INITQFNAMES
;
134 static struct quota_format_type
*quota_formats
; /* List of registered formats */
135 static struct quota_module_name module_names
[] = INIT_QUOTA_MODULE_NAMES
;
137 /* SLAB cache for dquot structures */
138 static struct kmem_cache
*dquot_cachep
;
140 int register_quota_format(struct quota_format_type
*fmt
)
142 spin_lock(&dq_list_lock
);
143 fmt
->qf_next
= quota_formats
;
145 spin_unlock(&dq_list_lock
);
148 EXPORT_SYMBOL(register_quota_format
);
150 void unregister_quota_format(struct quota_format_type
*fmt
)
152 struct quota_format_type
**actqf
;
154 spin_lock(&dq_list_lock
);
155 for (actqf
= "a_formats
; *actqf
&& *actqf
!= fmt
;
156 actqf
= &(*actqf
)->qf_next
)
159 *actqf
= (*actqf
)->qf_next
;
160 spin_unlock(&dq_list_lock
);
162 EXPORT_SYMBOL(unregister_quota_format
);
164 static struct quota_format_type
*find_quota_format(int id
)
166 struct quota_format_type
*actqf
;
168 spin_lock(&dq_list_lock
);
169 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
170 actqf
= actqf
->qf_next
)
172 if (!actqf
|| !try_module_get(actqf
->qf_owner
)) {
175 spin_unlock(&dq_list_lock
);
177 for (qm
= 0; module_names
[qm
].qm_fmt_id
&&
178 module_names
[qm
].qm_fmt_id
!= id
; qm
++)
180 if (!module_names
[qm
].qm_fmt_id
||
181 request_module(module_names
[qm
].qm_mod_name
))
184 spin_lock(&dq_list_lock
);
185 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
186 actqf
= actqf
->qf_next
)
188 if (actqf
&& !try_module_get(actqf
->qf_owner
))
191 spin_unlock(&dq_list_lock
);
195 static void put_quota_format(struct quota_format_type
*fmt
)
197 module_put(fmt
->qf_owner
);
201 * Dquot List Management:
202 * The quota code uses three lists for dquot management: the inuse_list,
203 * free_dquots, and dquot_hash[] array. A single dquot structure may be
204 * on all three lists, depending on its current state.
206 * All dquots are placed to the end of inuse_list when first created, and this
207 * list is used for invalidate operation, which must look at every dquot.
209 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
210 * and this list is searched whenever we need an available dquot. Dquots are
211 * removed from the list as soon as they are used again, and
212 * dqstats.free_dquots gives the number of dquots on the list. When
213 * dquot is invalidated it's completely released from memory.
215 * Dquots with a specific identity (device, type and id) are placed on
216 * one of the dquot_hash[] hash chains. The provides an efficient search
217 * mechanism to locate a specific dquot.
220 static LIST_HEAD(inuse_list
);
221 static LIST_HEAD(free_dquots
);
222 static unsigned int dq_hash_bits
, dq_hash_mask
;
223 static struct hlist_head
*dquot_hash
;
225 struct dqstats dqstats
;
226 EXPORT_SYMBOL(dqstats
);
228 static qsize_t
inode_get_rsv_space(struct inode
*inode
);
230 static inline unsigned int
231 hashfn(const struct super_block
*sb
, unsigned int id
, int type
)
235 tmp
= (((unsigned long)sb
>>L1_CACHE_SHIFT
) ^ id
) * (MAXQUOTAS
- type
);
236 return (tmp
+ (tmp
>> dq_hash_bits
)) & dq_hash_mask
;
240 * Following list functions expect dq_list_lock to be held
242 static inline void insert_dquot_hash(struct dquot
*dquot
)
244 struct hlist_head
*head
;
245 head
= dquot_hash
+ hashfn(dquot
->dq_sb
, dquot
->dq_id
, dquot
->dq_type
);
246 hlist_add_head(&dquot
->dq_hash
, head
);
249 static inline void remove_dquot_hash(struct dquot
*dquot
)
251 hlist_del_init(&dquot
->dq_hash
);
254 static struct dquot
*find_dquot(unsigned int hashent
, struct super_block
*sb
,
255 unsigned int id
, int type
)
257 struct hlist_node
*node
;
260 hlist_for_each (node
, dquot_hash
+hashent
) {
261 dquot
= hlist_entry(node
, struct dquot
, dq_hash
);
262 if (dquot
->dq_sb
== sb
&& dquot
->dq_id
== id
&&
263 dquot
->dq_type
== type
)
269 /* Add a dquot to the tail of the free list */
270 static inline void put_dquot_last(struct dquot
*dquot
)
272 list_add_tail(&dquot
->dq_free
, &free_dquots
);
273 dqstats
.free_dquots
++;
276 static inline void remove_free_dquot(struct dquot
*dquot
)
278 if (list_empty(&dquot
->dq_free
))
280 list_del_init(&dquot
->dq_free
);
281 dqstats
.free_dquots
--;
284 static inline void put_inuse(struct dquot
*dquot
)
286 /* We add to the back of inuse list so we don't have to restart
287 * when traversing this list and we block */
288 list_add_tail(&dquot
->dq_inuse
, &inuse_list
);
289 dqstats
.allocated_dquots
++;
292 static inline void remove_inuse(struct dquot
*dquot
)
294 dqstats
.allocated_dquots
--;
295 list_del(&dquot
->dq_inuse
);
298 * End of list functions needing dq_list_lock
301 static void wait_on_dquot(struct dquot
*dquot
)
303 mutex_lock(&dquot
->dq_lock
);
304 mutex_unlock(&dquot
->dq_lock
);
307 static inline int dquot_dirty(struct dquot
*dquot
)
309 return test_bit(DQ_MOD_B
, &dquot
->dq_flags
);
312 static inline int mark_dquot_dirty(struct dquot
*dquot
)
314 return dquot
->dq_sb
->dq_op
->mark_dirty(dquot
);
317 int dquot_mark_dquot_dirty(struct dquot
*dquot
)
319 spin_lock(&dq_list_lock
);
320 if (!test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
))
321 list_add(&dquot
->dq_dirty
, &sb_dqopt(dquot
->dq_sb
)->
322 info
[dquot
->dq_type
].dqi_dirty_list
);
323 spin_unlock(&dq_list_lock
);
326 EXPORT_SYMBOL(dquot_mark_dquot_dirty
);
328 /* Dirtify all the dquots - this can block when journalling */
329 static inline int mark_all_dquot_dirty(struct dquot
* const *dquot
)
334 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
336 /* Even in case of error we have to continue */
337 ret
= mark_dquot_dirty(dquot
[cnt
]);
344 static inline void dqput_all(struct dquot
**dquot
)
348 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
352 /* This function needs dq_list_lock */
353 static inline int clear_dquot_dirty(struct dquot
*dquot
)
355 if (!test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
))
357 list_del_init(&dquot
->dq_dirty
);
361 void mark_info_dirty(struct super_block
*sb
, int type
)
363 set_bit(DQF_INFO_DIRTY_B
, &sb_dqopt(sb
)->info
[type
].dqi_flags
);
365 EXPORT_SYMBOL(mark_info_dirty
);
368 * Read dquot from disk and alloc space for it
371 int dquot_acquire(struct dquot
*dquot
)
373 int ret
= 0, ret2
= 0;
374 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
376 mutex_lock(&dquot
->dq_lock
);
377 mutex_lock(&dqopt
->dqio_mutex
);
378 if (!test_bit(DQ_READ_B
, &dquot
->dq_flags
))
379 ret
= dqopt
->ops
[dquot
->dq_type
]->read_dqblk(dquot
);
382 set_bit(DQ_READ_B
, &dquot
->dq_flags
);
383 /* Instantiate dquot if needed */
384 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && !dquot
->dq_off
) {
385 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
386 /* Write the info if needed */
387 if (info_dirty(&dqopt
->info
[dquot
->dq_type
])) {
388 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(
389 dquot
->dq_sb
, dquot
->dq_type
);
398 set_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
400 mutex_unlock(&dqopt
->dqio_mutex
);
401 mutex_unlock(&dquot
->dq_lock
);
404 EXPORT_SYMBOL(dquot_acquire
);
407 * Write dquot to disk
409 int dquot_commit(struct dquot
*dquot
)
412 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
414 mutex_lock(&dqopt
->dqio_mutex
);
415 spin_lock(&dq_list_lock
);
416 if (!clear_dquot_dirty(dquot
)) {
417 spin_unlock(&dq_list_lock
);
420 spin_unlock(&dq_list_lock
);
421 /* Inactive dquot can be only if there was error during read/init
422 * => we have better not writing it */
423 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
424 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
428 mutex_unlock(&dqopt
->dqio_mutex
);
431 EXPORT_SYMBOL(dquot_commit
);
436 int dquot_release(struct dquot
*dquot
)
438 int ret
= 0, ret2
= 0;
439 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
441 mutex_lock(&dquot
->dq_lock
);
442 /* Check whether we are not racing with some other dqget() */
443 if (atomic_read(&dquot
->dq_count
) > 1)
445 mutex_lock(&dqopt
->dqio_mutex
);
446 if (dqopt
->ops
[dquot
->dq_type
]->release_dqblk
) {
447 ret
= dqopt
->ops
[dquot
->dq_type
]->release_dqblk(dquot
);
449 if (info_dirty(&dqopt
->info
[dquot
->dq_type
])) {
450 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(
451 dquot
->dq_sb
, dquot
->dq_type
);
456 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
457 mutex_unlock(&dqopt
->dqio_mutex
);
459 mutex_unlock(&dquot
->dq_lock
);
462 EXPORT_SYMBOL(dquot_release
);
464 void dquot_destroy(struct dquot
*dquot
)
466 kmem_cache_free(dquot_cachep
, dquot
);
468 EXPORT_SYMBOL(dquot_destroy
);
470 static inline void do_destroy_dquot(struct dquot
*dquot
)
472 dquot
->dq_sb
->dq_op
->destroy_dquot(dquot
);
475 /* Invalidate all dquots on the list. Note that this function is called after
476 * quota is disabled and pointers from inodes removed so there cannot be new
477 * quota users. There can still be some users of quotas due to inodes being
478 * just deleted or pruned by prune_icache() (those are not attached to any
479 * list) or parallel quotactl call. We have to wait for such users.
481 static void invalidate_dquots(struct super_block
*sb
, int type
)
483 struct dquot
*dquot
, *tmp
;
486 spin_lock(&dq_list_lock
);
487 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
488 if (dquot
->dq_sb
!= sb
)
490 if (dquot
->dq_type
!= type
)
492 /* Wait for dquot users */
493 if (atomic_read(&dquot
->dq_count
)) {
496 atomic_inc(&dquot
->dq_count
);
497 prepare_to_wait(&dquot
->dq_wait_unused
, &wait
,
498 TASK_UNINTERRUPTIBLE
);
499 spin_unlock(&dq_list_lock
);
500 /* Once dqput() wakes us up, we know it's time to free
502 * IMPORTANT: we rely on the fact that there is always
503 * at most one process waiting for dquot to free.
504 * Otherwise dq_count would be > 1 and we would never
507 if (atomic_read(&dquot
->dq_count
) > 1)
509 finish_wait(&dquot
->dq_wait_unused
, &wait
);
511 /* At this moment dquot() need not exist (it could be
512 * reclaimed by prune_dqcache(). Hence we must
517 * Quota now has no users and it has been written on last
520 remove_dquot_hash(dquot
);
521 remove_free_dquot(dquot
);
523 do_destroy_dquot(dquot
);
525 spin_unlock(&dq_list_lock
);
528 /* Call callback for every active dquot on given filesystem */
529 int dquot_scan_active(struct super_block
*sb
,
530 int (*fn
)(struct dquot
*dquot
, unsigned long priv
),
533 struct dquot
*dquot
, *old_dquot
= NULL
;
536 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
537 spin_lock(&dq_list_lock
);
538 list_for_each_entry(dquot
, &inuse_list
, dq_inuse
) {
539 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
541 if (dquot
->dq_sb
!= sb
)
543 /* Now we have active dquot so we can just increase use count */
544 atomic_inc(&dquot
->dq_count
);
546 spin_unlock(&dq_list_lock
);
549 ret
= fn(dquot
, priv
);
552 spin_lock(&dq_list_lock
);
553 /* We are safe to continue now because our dquot could not
554 * be moved out of the inuse list while we hold the reference */
556 spin_unlock(&dq_list_lock
);
559 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
562 EXPORT_SYMBOL(dquot_scan_active
);
564 int vfs_quota_sync(struct super_block
*sb
, int type
)
566 struct list_head
*dirty
;
568 struct quota_info
*dqopt
= sb_dqopt(sb
);
571 mutex_lock(&dqopt
->dqonoff_mutex
);
572 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
573 if (type
!= -1 && cnt
!= type
)
575 if (!sb_has_quota_active(sb
, cnt
))
577 spin_lock(&dq_list_lock
);
578 dirty
= &dqopt
->info
[cnt
].dqi_dirty_list
;
579 while (!list_empty(dirty
)) {
580 dquot
= list_first_entry(dirty
, struct dquot
,
582 /* Dirty and inactive can be only bad dquot... */
583 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
584 clear_dquot_dirty(dquot
);
587 /* Now we have active dquot from which someone is
588 * holding reference so we can safely just increase
590 atomic_inc(&dquot
->dq_count
);
592 spin_unlock(&dq_list_lock
);
593 sb
->dq_op
->write_dquot(dquot
);
595 spin_lock(&dq_list_lock
);
597 spin_unlock(&dq_list_lock
);
600 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
601 if ((cnt
== type
|| type
== -1) && sb_has_quota_active(sb
, cnt
)
602 && info_dirty(&dqopt
->info
[cnt
]))
603 sb
->dq_op
->write_info(sb
, cnt
);
604 spin_lock(&dq_list_lock
);
606 spin_unlock(&dq_list_lock
);
607 mutex_unlock(&dqopt
->dqonoff_mutex
);
611 EXPORT_SYMBOL(vfs_quota_sync
);
613 /* Free unused dquots from cache */
614 static void prune_dqcache(int count
)
616 struct list_head
*head
;
619 head
= free_dquots
.prev
;
620 while (head
!= &free_dquots
&& count
) {
621 dquot
= list_entry(head
, struct dquot
, dq_free
);
622 remove_dquot_hash(dquot
);
623 remove_free_dquot(dquot
);
625 do_destroy_dquot(dquot
);
627 head
= free_dquots
.prev
;
632 * This is called from kswapd when we think we need some
636 static int shrink_dqcache_memory(int nr
, gfp_t gfp_mask
)
639 spin_lock(&dq_list_lock
);
641 spin_unlock(&dq_list_lock
);
643 return (dqstats
.free_dquots
/ 100) * sysctl_vfs_cache_pressure
;
646 static struct shrinker dqcache_shrinker
= {
647 .shrink
= shrink_dqcache_memory
,
648 .seeks
= DEFAULT_SEEKS
,
652 * Put reference to dquot
653 * NOTE: If you change this function please check whether dqput_blocks() works right...
655 void dqput(struct dquot
*dquot
)
661 #ifdef __DQUOT_PARANOIA
662 if (!atomic_read(&dquot
->dq_count
)) {
663 printk("VFS: dqput: trying to free free dquot\n");
664 printk("VFS: device %s, dquot of %s %d\n",
666 quotatypes
[dquot
->dq_type
],
672 spin_lock(&dq_list_lock
);
674 spin_unlock(&dq_list_lock
);
676 spin_lock(&dq_list_lock
);
677 if (atomic_read(&dquot
->dq_count
) > 1) {
678 /* We have more than one user... nothing to do */
679 atomic_dec(&dquot
->dq_count
);
680 /* Releasing dquot during quotaoff phase? */
681 if (!sb_has_quota_active(dquot
->dq_sb
, dquot
->dq_type
) &&
682 atomic_read(&dquot
->dq_count
) == 1)
683 wake_up(&dquot
->dq_wait_unused
);
684 spin_unlock(&dq_list_lock
);
687 /* Need to release dquot? */
688 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && dquot_dirty(dquot
)) {
689 spin_unlock(&dq_list_lock
);
690 /* Commit dquot before releasing */
691 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
693 printk(KERN_ERR
"VFS: cannot write quota structure on "
694 "device %s (error %d). Quota may get out of "
695 "sync!\n", dquot
->dq_sb
->s_id
, ret
);
697 * We clear dirty bit anyway, so that we avoid
700 spin_lock(&dq_list_lock
);
701 clear_dquot_dirty(dquot
);
702 spin_unlock(&dq_list_lock
);
706 /* Clear flag in case dquot was inactive (something bad happened) */
707 clear_dquot_dirty(dquot
);
708 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
709 spin_unlock(&dq_list_lock
);
710 dquot
->dq_sb
->dq_op
->release_dquot(dquot
);
713 atomic_dec(&dquot
->dq_count
);
714 #ifdef __DQUOT_PARANOIA
716 BUG_ON(!list_empty(&dquot
->dq_free
));
718 put_dquot_last(dquot
);
719 spin_unlock(&dq_list_lock
);
721 EXPORT_SYMBOL(dqput
);
723 struct dquot
*dquot_alloc(struct super_block
*sb
, int type
)
725 return kmem_cache_zalloc(dquot_cachep
, GFP_NOFS
);
727 EXPORT_SYMBOL(dquot_alloc
);
729 static struct dquot
*get_empty_dquot(struct super_block
*sb
, int type
)
733 dquot
= sb
->dq_op
->alloc_dquot(sb
, type
);
737 mutex_init(&dquot
->dq_lock
);
738 INIT_LIST_HEAD(&dquot
->dq_free
);
739 INIT_LIST_HEAD(&dquot
->dq_inuse
);
740 INIT_HLIST_NODE(&dquot
->dq_hash
);
741 INIT_LIST_HEAD(&dquot
->dq_dirty
);
742 init_waitqueue_head(&dquot
->dq_wait_unused
);
744 dquot
->dq_type
= type
;
745 atomic_set(&dquot
->dq_count
, 1);
751 * Get reference to dquot
753 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
754 * destroying our dquot by:
755 * a) checking for quota flags under dq_list_lock and
756 * b) getting a reference to dquot before we release dq_list_lock
758 struct dquot
*dqget(struct super_block
*sb
, unsigned int id
, int type
)
760 unsigned int hashent
= hashfn(sb
, id
, type
);
761 struct dquot
*dquot
= NULL
, *empty
= NULL
;
763 if (!sb_has_quota_active(sb
, type
))
766 spin_lock(&dq_list_lock
);
767 spin_lock(&dq_state_lock
);
768 if (!sb_has_quota_active(sb
, type
)) {
769 spin_unlock(&dq_state_lock
);
770 spin_unlock(&dq_list_lock
);
773 spin_unlock(&dq_state_lock
);
775 dquot
= find_dquot(hashent
, sb
, id
, type
);
778 spin_unlock(&dq_list_lock
);
779 empty
= get_empty_dquot(sb
, type
);
781 schedule(); /* Try to wait for a moment... */
787 /* all dquots go on the inuse_list */
789 /* hash it first so it can be found */
790 insert_dquot_hash(dquot
);
792 spin_unlock(&dq_list_lock
);
794 if (!atomic_read(&dquot
->dq_count
))
795 remove_free_dquot(dquot
);
796 atomic_inc(&dquot
->dq_count
);
797 dqstats
.cache_hits
++;
799 spin_unlock(&dq_list_lock
);
801 /* Wait for dq_lock - after this we know that either dquot_release() is
802 * already finished or it will be canceled due to dq_count > 1 test */
803 wait_on_dquot(dquot
);
804 /* Read the dquot / allocate space in quota file */
805 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) &&
806 sb
->dq_op
->acquire_dquot(dquot
) < 0) {
811 #ifdef __DQUOT_PARANOIA
812 BUG_ON(!dquot
->dq_sb
); /* Has somebody invalidated entry under us? */
816 do_destroy_dquot(empty
);
820 EXPORT_SYMBOL(dqget
);
822 static int dqinit_needed(struct inode
*inode
, int type
)
826 if (IS_NOQUOTA(inode
))
829 return !inode
->i_dquot
[type
];
830 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
831 if (!inode
->i_dquot
[cnt
])
836 /* This routine is guarded by dqonoff_mutex mutex */
837 static void add_dquot_ref(struct super_block
*sb
, int type
)
839 struct inode
*inode
, *old_inode
= NULL
;
842 spin_lock(&inode_lock
);
843 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
844 if (inode
->i_state
& (I_FREEING
|I_CLEAR
|I_WILL_FREE
|I_NEW
))
846 if (unlikely(inode_get_rsv_space(inode
) > 0))
848 if (!atomic_read(&inode
->i_writecount
))
850 if (!dqinit_needed(inode
, type
))
854 spin_unlock(&inode_lock
);
857 sb
->dq_op
->initialize(inode
, type
);
858 /* We hold a reference to 'inode' so it couldn't have been
859 * removed from s_inodes list while we dropped the inode_lock.
860 * We cannot iput the inode now as we can be holding the last
861 * reference and we cannot iput it under inode_lock. So we
862 * keep the reference and iput it later. */
864 spin_lock(&inode_lock
);
866 spin_unlock(&inode_lock
);
870 printk(KERN_WARNING
"VFS (%s): Writes happened before quota"
871 " was turned on thus quota information is probably "
872 "inconsistent. Please run quotacheck(8).\n", sb
->s_id
);
877 * Return 0 if dqput() won't block.
878 * (note that 1 doesn't necessarily mean blocking)
880 static inline int dqput_blocks(struct dquot
*dquot
)
882 if (atomic_read(&dquot
->dq_count
) <= 1)
888 * Remove references to dquots from inode and add dquot to list for freeing
889 * if we have the last referece to dquot
890 * We can't race with anybody because we hold dqptr_sem for writing...
892 static int remove_inode_dquot_ref(struct inode
*inode
, int type
,
893 struct list_head
*tofree_head
)
895 struct dquot
*dquot
= inode
->i_dquot
[type
];
897 inode
->i_dquot
[type
] = NULL
;
899 if (dqput_blocks(dquot
)) {
900 #ifdef __DQUOT_PARANOIA
901 if (atomic_read(&dquot
->dq_count
) != 1)
902 printk(KERN_WARNING
"VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot
->dq_count
));
904 spin_lock(&dq_list_lock
);
905 /* As dquot must have currently users it can't be on
906 * the free list... */
907 list_add(&dquot
->dq_free
, tofree_head
);
908 spin_unlock(&dq_list_lock
);
912 dqput(dquot
); /* We have guaranteed we won't block */
918 * Free list of dquots
919 * Dquots are removed from inodes and no new references can be got so we are
920 * the only ones holding reference
922 static void put_dquot_list(struct list_head
*tofree_head
)
924 struct list_head
*act_head
;
927 act_head
= tofree_head
->next
;
928 while (act_head
!= tofree_head
) {
929 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
930 act_head
= act_head
->next
;
931 /* Remove dquot from the list so we won't have problems... */
932 list_del_init(&dquot
->dq_free
);
937 static void remove_dquot_ref(struct super_block
*sb
, int type
,
938 struct list_head
*tofree_head
)
942 spin_lock(&inode_lock
);
943 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
945 * We have to scan also I_NEW inodes because they can already
946 * have quota pointer initialized. Luckily, we need to touch
947 * only quota pointers and these have separate locking
950 if (!IS_NOQUOTA(inode
))
951 remove_inode_dquot_ref(inode
, type
, tofree_head
);
953 spin_unlock(&inode_lock
);
956 /* Gather all references from inodes and drop them */
957 static void drop_dquot_ref(struct super_block
*sb
, int type
)
959 LIST_HEAD(tofree_head
);
962 down_write(&sb_dqopt(sb
)->dqptr_sem
);
963 remove_dquot_ref(sb
, type
, &tofree_head
);
964 up_write(&sb_dqopt(sb
)->dqptr_sem
);
965 put_dquot_list(&tofree_head
);
969 static inline void dquot_incr_inodes(struct dquot
*dquot
, qsize_t number
)
971 dquot
->dq_dqb
.dqb_curinodes
+= number
;
974 static inline void dquot_incr_space(struct dquot
*dquot
, qsize_t number
)
976 dquot
->dq_dqb
.dqb_curspace
+= number
;
979 static inline void dquot_resv_space(struct dquot
*dquot
, qsize_t number
)
981 dquot
->dq_dqb
.dqb_rsvspace
+= number
;
985 * Claim reserved quota space
987 static void dquot_claim_reserved_space(struct dquot
*dquot
, qsize_t number
)
989 if (dquot
->dq_dqb
.dqb_rsvspace
< number
) {
991 number
= dquot
->dq_dqb
.dqb_rsvspace
;
993 dquot
->dq_dqb
.dqb_curspace
+= number
;
994 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
998 void dquot_free_reserved_space(struct dquot
*dquot
, qsize_t number
)
1000 if (dquot
->dq_dqb
.dqb_rsvspace
>= number
)
1001 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1004 dquot
->dq_dqb
.dqb_rsvspace
= 0;
1008 static void dquot_decr_inodes(struct dquot
*dquot
, qsize_t number
)
1010 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1011 dquot
->dq_dqb
.dqb_curinodes
>= number
)
1012 dquot
->dq_dqb
.dqb_curinodes
-= number
;
1014 dquot
->dq_dqb
.dqb_curinodes
= 0;
1015 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1016 dquot
->dq_dqb
.dqb_itime
= (time_t) 0;
1017 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
1020 static void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
1022 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1023 dquot
->dq_dqb
.dqb_curspace
>= number
)
1024 dquot
->dq_dqb
.dqb_curspace
-= number
;
1026 dquot
->dq_dqb
.dqb_curspace
= 0;
1027 if (dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1028 dquot
->dq_dqb
.dqb_btime
= (time_t) 0;
1029 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1032 static int warning_issued(struct dquot
*dquot
, const int warntype
)
1034 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
1035 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
1036 ((warntype
== QUOTA_NL_IHARDWARN
||
1037 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
1041 return test_and_set_bit(flag
, &dquot
->dq_flags
);
1044 #ifdef CONFIG_PRINT_QUOTA_WARNING
1045 static int flag_print_warnings
= 1;
1047 static int need_print_warning(struct dquot
*dquot
)
1049 if (!flag_print_warnings
)
1052 switch (dquot
->dq_type
) {
1054 return current_fsuid() == dquot
->dq_id
;
1056 return in_group_p(dquot
->dq_id
);
1061 /* Print warning to user which exceeded quota */
1062 static void print_warning(struct dquot
*dquot
, const int warntype
)
1065 struct tty_struct
*tty
;
1067 if (warntype
== QUOTA_NL_IHARDBELOW
||
1068 warntype
== QUOTA_NL_ISOFTBELOW
||
1069 warntype
== QUOTA_NL_BHARDBELOW
||
1070 warntype
== QUOTA_NL_BSOFTBELOW
|| !need_print_warning(dquot
))
1073 tty
= get_current_tty();
1076 tty_write_message(tty
, dquot
->dq_sb
->s_id
);
1077 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
1078 tty_write_message(tty
, ": warning, ");
1080 tty_write_message(tty
, ": write failed, ");
1081 tty_write_message(tty
, quotatypes
[dquot
->dq_type
]);
1083 case QUOTA_NL_IHARDWARN
:
1084 msg
= " file limit reached.\r\n";
1086 case QUOTA_NL_ISOFTLONGWARN
:
1087 msg
= " file quota exceeded too long.\r\n";
1089 case QUOTA_NL_ISOFTWARN
:
1090 msg
= " file quota exceeded.\r\n";
1092 case QUOTA_NL_BHARDWARN
:
1093 msg
= " block limit reached.\r\n";
1095 case QUOTA_NL_BSOFTLONGWARN
:
1096 msg
= " block quota exceeded too long.\r\n";
1098 case QUOTA_NL_BSOFTWARN
:
1099 msg
= " block quota exceeded.\r\n";
1102 tty_write_message(tty
, msg
);
1108 * Write warnings to the console and send warning messages over netlink.
1110 * Note that this function can sleep.
1112 static void flush_warnings(struct dquot
*const *dquots
, char *warntype
)
1117 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1119 if (dq
&& warntype
[i
] != QUOTA_NL_NOWARN
&&
1120 !warning_issued(dq
, warntype
[i
])) {
1121 #ifdef CONFIG_PRINT_QUOTA_WARNING
1122 print_warning(dq
, warntype
[i
]);
1124 quota_send_warning(dq
->dq_type
, dq
->dq_id
,
1125 dq
->dq_sb
->s_dev
, warntype
[i
]);
1130 static int ignore_hardlimit(struct dquot
*dquot
)
1132 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
1134 return capable(CAP_SYS_RESOURCE
) &&
1135 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
||
1136 !(info
->dqi_flags
& V1_DQF_RSQUASH
));
1139 /* needs dq_data_lock */
1140 static int check_idq(struct dquot
*dquot
, qsize_t inodes
, char *warntype
)
1142 qsize_t newinodes
= dquot
->dq_dqb
.dqb_curinodes
+ inodes
;
1144 *warntype
= QUOTA_NL_NOWARN
;
1145 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
) ||
1146 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1149 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1150 newinodes
> dquot
->dq_dqb
.dqb_ihardlimit
&&
1151 !ignore_hardlimit(dquot
)) {
1152 *warntype
= QUOTA_NL_IHARDWARN
;
1156 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1157 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1158 dquot
->dq_dqb
.dqb_itime
&&
1159 get_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1160 !ignore_hardlimit(dquot
)) {
1161 *warntype
= QUOTA_NL_ISOFTLONGWARN
;
1165 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1166 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1167 dquot
->dq_dqb
.dqb_itime
== 0) {
1168 *warntype
= QUOTA_NL_ISOFTWARN
;
1169 dquot
->dq_dqb
.dqb_itime
= get_seconds() +
1170 sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_igrace
;
1176 /* needs dq_data_lock */
1177 static int check_bdq(struct dquot
*dquot
, qsize_t space
, int prealloc
, char *warntype
)
1180 struct super_block
*sb
= dquot
->dq_sb
;
1182 *warntype
= QUOTA_NL_NOWARN
;
1183 if (!sb_has_quota_limits_enabled(sb
, dquot
->dq_type
) ||
1184 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1187 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
1190 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1191 tspace
> dquot
->dq_dqb
.dqb_bhardlimit
&&
1192 !ignore_hardlimit(dquot
)) {
1194 *warntype
= QUOTA_NL_BHARDWARN
;
1198 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1199 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1200 dquot
->dq_dqb
.dqb_btime
&&
1201 get_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1202 !ignore_hardlimit(dquot
)) {
1204 *warntype
= QUOTA_NL_BSOFTLONGWARN
;
1208 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1209 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1210 dquot
->dq_dqb
.dqb_btime
== 0) {
1212 *warntype
= QUOTA_NL_BSOFTWARN
;
1213 dquot
->dq_dqb
.dqb_btime
= get_seconds() +
1214 sb_dqopt(sb
)->info
[dquot
->dq_type
].dqi_bgrace
;
1218 * We don't allow preallocation to exceed softlimit so exceeding will
1227 static int info_idq_free(struct dquot
*dquot
, qsize_t inodes
)
1231 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1232 dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
||
1233 !sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
))
1234 return QUOTA_NL_NOWARN
;
1236 newinodes
= dquot
->dq_dqb
.dqb_curinodes
- inodes
;
1237 if (newinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1238 return QUOTA_NL_ISOFTBELOW
;
1239 if (dquot
->dq_dqb
.dqb_curinodes
>= dquot
->dq_dqb
.dqb_ihardlimit
&&
1240 newinodes
< dquot
->dq_dqb
.dqb_ihardlimit
)
1241 return QUOTA_NL_IHARDBELOW
;
1242 return QUOTA_NL_NOWARN
;
1245 static int info_bdq_free(struct dquot
*dquot
, qsize_t space
)
1247 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1248 dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1249 return QUOTA_NL_NOWARN
;
1251 if (dquot
->dq_dqb
.dqb_curspace
- space
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1252 return QUOTA_NL_BSOFTBELOW
;
1253 if (dquot
->dq_dqb
.dqb_curspace
>= dquot
->dq_dqb
.dqb_bhardlimit
&&
1254 dquot
->dq_dqb
.dqb_curspace
- space
< dquot
->dq_dqb
.dqb_bhardlimit
)
1255 return QUOTA_NL_BHARDBELOW
;
1256 return QUOTA_NL_NOWARN
;
1260 * Initialize quota pointers in inode
1261 * We do things in a bit complicated way but by that we avoid calling
1262 * dqget() and thus filesystem callbacks under dqptr_sem.
1264 int dquot_initialize(struct inode
*inode
, int type
)
1266 unsigned int id
= 0;
1268 struct dquot
*got
[MAXQUOTAS
] = { NULL
, NULL
};
1269 struct super_block
*sb
= inode
->i_sb
;
1272 /* First test before acquiring mutex - solves deadlocks when we
1273 * re-enter the quota code and are already holding the mutex */
1274 if (IS_NOQUOTA(inode
))
1277 /* First get references to structures we might need. */
1278 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1279 if (type
!= -1 && cnt
!= type
)
1289 got
[cnt
] = dqget(sb
, id
, cnt
);
1292 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1293 /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
1294 if (IS_NOQUOTA(inode
))
1296 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1297 if (type
!= -1 && cnt
!= type
)
1299 /* Avoid races with quotaoff() */
1300 if (!sb_has_quota_active(sb
, cnt
))
1302 if (!inode
->i_dquot
[cnt
]) {
1303 inode
->i_dquot
[cnt
] = got
[cnt
];
1306 * Make quota reservation system happy if someone
1307 * did a write before quota was turned on
1309 rsv
= inode_get_rsv_space(inode
);
1311 dquot_resv_space(inode
->i_dquot
[cnt
], rsv
);
1315 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1316 /* Drop unused references */
1320 EXPORT_SYMBOL(dquot_initialize
);
1323 * Release all quotas referenced by inode
1325 int dquot_drop(struct inode
*inode
)
1328 struct dquot
*put
[MAXQUOTAS
];
1330 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1331 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1332 put
[cnt
] = inode
->i_dquot
[cnt
];
1333 inode
->i_dquot
[cnt
] = NULL
;
1335 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1339 EXPORT_SYMBOL(dquot_drop
);
1341 /* Wrapper to remove references to quota structures from inode */
1342 void vfs_dq_drop(struct inode
*inode
)
1344 /* Here we can get arbitrary inode from clear_inode() so we have
1345 * to be careful. OTOH we don't need locking as quota operations
1346 * are allowed to change only at mount time */
1347 if (!IS_NOQUOTA(inode
) && inode
->i_sb
&& inode
->i_sb
->dq_op
1348 && inode
->i_sb
->dq_op
->drop
) {
1350 /* Test before calling to rule out calls from proc and such
1351 * where we are not allowed to block. Note that this is
1352 * actually reliable test even without the lock - the caller
1353 * must assure that nobody can come after the DQUOT_DROP and
1354 * add quota pointers back anyway */
1355 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1356 if (inode
->i_dquot
[cnt
])
1358 if (cnt
< MAXQUOTAS
)
1359 inode
->i_sb
->dq_op
->drop(inode
);
1362 EXPORT_SYMBOL(vfs_dq_drop
);
1365 * inode_reserved_space is managed internally by quota, and protected by
1366 * i_lock similar to i_blocks+i_bytes.
1368 static qsize_t
*inode_reserved_space(struct inode
* inode
)
1370 /* Filesystem must explicitly define it's own method in order to use
1371 * quota reservation interface */
1372 BUG_ON(!inode
->i_sb
->dq_op
->get_reserved_space
);
1373 return inode
->i_sb
->dq_op
->get_reserved_space(inode
);
1376 void inode_add_rsv_space(struct inode
*inode
, qsize_t number
)
1378 spin_lock(&inode
->i_lock
);
1379 *inode_reserved_space(inode
) += number
;
1380 spin_unlock(&inode
->i_lock
);
1382 EXPORT_SYMBOL(inode_add_rsv_space
);
1384 void inode_claim_rsv_space(struct inode
*inode
, qsize_t number
)
1386 spin_lock(&inode
->i_lock
);
1387 *inode_reserved_space(inode
) -= number
;
1388 __inode_add_bytes(inode
, number
);
1389 spin_unlock(&inode
->i_lock
);
1391 EXPORT_SYMBOL(inode_claim_rsv_space
);
1393 void inode_sub_rsv_space(struct inode
*inode
, qsize_t number
)
1395 spin_lock(&inode
->i_lock
);
1396 *inode_reserved_space(inode
) -= number
;
1397 spin_unlock(&inode
->i_lock
);
1399 EXPORT_SYMBOL(inode_sub_rsv_space
);
1401 static qsize_t
inode_get_rsv_space(struct inode
*inode
)
1405 if (!inode
->i_sb
->dq_op
->get_reserved_space
)
1407 spin_lock(&inode
->i_lock
);
1408 ret
= *inode_reserved_space(inode
);
1409 spin_unlock(&inode
->i_lock
);
1413 static void inode_incr_space(struct inode
*inode
, qsize_t number
,
1417 inode_add_rsv_space(inode
, number
);
1419 inode_add_bytes(inode
, number
);
1422 static void inode_decr_space(struct inode
*inode
, qsize_t number
, int reserve
)
1425 inode_sub_rsv_space(inode
, number
);
1427 inode_sub_bytes(inode
, number
);
1431 * Following four functions update i_blocks+i_bytes fields and
1432 * quota information (together with appropriate checks)
1433 * NOTE: We absolutely rely on the fact that caller dirties
1434 * the inode (usually macros in quotaops.h care about this) and
1435 * holds a handle for the current transaction so that dquot write and
1436 * inode write go into the same transaction.
1440 * This operation can block, but only after everything is updated
1442 int __dquot_alloc_space(struct inode
*inode
, qsize_t number
,
1443 int warn
, int reserve
)
1445 int cnt
, ret
= QUOTA_OK
;
1446 char warntype
[MAXQUOTAS
];
1449 * First test before acquiring mutex - solves deadlocks when we
1450 * re-enter the quota code and are already holding the mutex
1452 if (IS_NOQUOTA(inode
)) {
1453 inode_incr_space(inode
, number
, reserve
);
1457 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1458 if (IS_NOQUOTA(inode
)) {
1459 inode_incr_space(inode
, number
, reserve
);
1463 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1464 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1466 spin_lock(&dq_data_lock
);
1467 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1468 if (!inode
->i_dquot
[cnt
])
1470 if (check_bdq(inode
->i_dquot
[cnt
], number
, warn
, warntype
+cnt
)
1473 spin_unlock(&dq_data_lock
);
1474 goto out_flush_warn
;
1477 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1478 if (!inode
->i_dquot
[cnt
])
1481 dquot_resv_space(inode
->i_dquot
[cnt
], number
);
1483 dquot_incr_space(inode
->i_dquot
[cnt
], number
);
1485 inode_incr_space(inode
, number
, reserve
);
1486 spin_unlock(&dq_data_lock
);
1489 goto out_flush_warn
;
1490 mark_all_dquot_dirty(inode
->i_dquot
);
1492 flush_warnings(inode
->i_dquot
, warntype
);
1494 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1499 int dquot_alloc_space(struct inode
*inode
, qsize_t number
, int warn
)
1501 return __dquot_alloc_space(inode
, number
, warn
, 0);
1503 EXPORT_SYMBOL(dquot_alloc_space
);
1505 int dquot_reserve_space(struct inode
*inode
, qsize_t number
, int warn
)
1507 return __dquot_alloc_space(inode
, number
, warn
, 1);
1509 EXPORT_SYMBOL(dquot_reserve_space
);
1512 * This operation can block, but only after everything is updated
1514 int dquot_alloc_inode(const struct inode
*inode
, qsize_t number
)
1516 int cnt
, ret
= NO_QUOTA
;
1517 char warntype
[MAXQUOTAS
];
1519 /* First test before acquiring mutex - solves deadlocks when we
1520 * re-enter the quota code and are already holding the mutex */
1521 if (IS_NOQUOTA(inode
))
1523 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1524 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1525 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1526 if (IS_NOQUOTA(inode
)) {
1527 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1530 spin_lock(&dq_data_lock
);
1531 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1532 if (!inode
->i_dquot
[cnt
])
1534 if (check_idq(inode
->i_dquot
[cnt
], number
, warntype
+cnt
)
1539 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1540 if (!inode
->i_dquot
[cnt
])
1542 dquot_incr_inodes(inode
->i_dquot
[cnt
], number
);
1546 spin_unlock(&dq_data_lock
);
1547 if (ret
== QUOTA_OK
)
1548 mark_all_dquot_dirty(inode
->i_dquot
);
1549 flush_warnings(inode
->i_dquot
, warntype
);
1550 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1553 EXPORT_SYMBOL(dquot_alloc_inode
);
1555 int dquot_claim_space(struct inode
*inode
, qsize_t number
)
1560 if (IS_NOQUOTA(inode
)) {
1561 inode_claim_rsv_space(inode
, number
);
1565 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1566 if (IS_NOQUOTA(inode
)) {
1567 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1568 inode_claim_rsv_space(inode
, number
);
1572 spin_lock(&dq_data_lock
);
1573 /* Claim reserved quotas to allocated quotas */
1574 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1575 if (inode
->i_dquot
[cnt
])
1576 dquot_claim_reserved_space(inode
->i_dquot
[cnt
],
1579 /* Update inode bytes */
1580 inode_claim_rsv_space(inode
, number
);
1581 spin_unlock(&dq_data_lock
);
1582 mark_all_dquot_dirty(inode
->i_dquot
);
1583 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1587 EXPORT_SYMBOL(dquot_claim_space
);
1590 * This operation can block, but only after everything is updated
1592 int __dquot_free_space(struct inode
*inode
, qsize_t number
, int reserve
)
1595 char warntype
[MAXQUOTAS
];
1597 /* First test before acquiring mutex - solves deadlocks when we
1598 * re-enter the quota code and are already holding the mutex */
1599 if (IS_NOQUOTA(inode
)) {
1601 inode_decr_space(inode
, number
, reserve
);
1605 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1606 /* Now recheck reliably when holding dqptr_sem */
1607 if (IS_NOQUOTA(inode
)) {
1608 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1611 spin_lock(&dq_data_lock
);
1612 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1613 if (!inode
->i_dquot
[cnt
])
1615 warntype
[cnt
] = info_bdq_free(inode
->i_dquot
[cnt
], number
);
1617 dquot_free_reserved_space(inode
->i_dquot
[cnt
], number
);
1619 dquot_decr_space(inode
->i_dquot
[cnt
], number
);
1621 inode_decr_space(inode
, number
, reserve
);
1622 spin_unlock(&dq_data_lock
);
1626 mark_all_dquot_dirty(inode
->i_dquot
);
1628 flush_warnings(inode
->i_dquot
, warntype
);
1629 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1633 int dquot_free_space(struct inode
*inode
, qsize_t number
)
1635 return __dquot_free_space(inode
, number
, 0);
1637 EXPORT_SYMBOL(dquot_free_space
);
1640 * Release reserved quota space
1642 void dquot_release_reserved_space(struct inode
*inode
, qsize_t number
)
1644 __dquot_free_space(inode
, number
, 1);
1647 EXPORT_SYMBOL(dquot_release_reserved_space
);
1650 * This operation can block, but only after everything is updated
1652 int dquot_free_inode(const struct inode
*inode
, qsize_t number
)
1655 char warntype
[MAXQUOTAS
];
1657 /* First test before acquiring mutex - solves deadlocks when we
1658 * re-enter the quota code and are already holding the mutex */
1659 if (IS_NOQUOTA(inode
))
1662 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1663 /* Now recheck reliably when holding dqptr_sem */
1664 if (IS_NOQUOTA(inode
)) {
1665 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1668 spin_lock(&dq_data_lock
);
1669 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1670 if (!inode
->i_dquot
[cnt
])
1672 warntype
[cnt
] = info_idq_free(inode
->i_dquot
[cnt
], number
);
1673 dquot_decr_inodes(inode
->i_dquot
[cnt
], number
);
1675 spin_unlock(&dq_data_lock
);
1676 mark_all_dquot_dirty(inode
->i_dquot
);
1677 flush_warnings(inode
->i_dquot
, warntype
);
1678 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1681 EXPORT_SYMBOL(dquot_free_inode
);
1684 * Transfer the number of inode and blocks from one diskquota to an other.
1686 * This operation can block, but only after everything is updated
1687 * A transaction must be started when entering this function.
1689 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
1691 qsize_t space
, cur_space
;
1692 qsize_t rsv_space
= 0;
1693 struct dquot
*transfer_from
[MAXQUOTAS
];
1694 struct dquot
*transfer_to
[MAXQUOTAS
];
1695 int cnt
, ret
= QUOTA_OK
;
1696 int chuid
= iattr
->ia_valid
& ATTR_UID
&& inode
->i_uid
!= iattr
->ia_uid
,
1697 chgid
= iattr
->ia_valid
& ATTR_GID
&& inode
->i_gid
!= iattr
->ia_gid
;
1698 char warntype_to
[MAXQUOTAS
];
1699 char warntype_from_inodes
[MAXQUOTAS
], warntype_from_space
[MAXQUOTAS
];
1701 /* First test before acquiring mutex - solves deadlocks when we
1702 * re-enter the quota code and are already holding the mutex */
1703 if (IS_NOQUOTA(inode
))
1705 /* Initialize the arrays */
1706 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1707 transfer_from
[cnt
] = NULL
;
1708 transfer_to
[cnt
] = NULL
;
1709 warntype_to
[cnt
] = QUOTA_NL_NOWARN
;
1712 transfer_to
[USRQUOTA
] = dqget(inode
->i_sb
, iattr
->ia_uid
,
1715 transfer_to
[GRPQUOTA
] = dqget(inode
->i_sb
, iattr
->ia_gid
,
1718 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1719 /* Now recheck reliably when holding dqptr_sem */
1720 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1721 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1724 spin_lock(&dq_data_lock
);
1725 cur_space
= inode_get_bytes(inode
);
1726 rsv_space
= inode_get_rsv_space(inode
);
1727 space
= cur_space
+ rsv_space
;
1728 /* Build the transfer_from list and check the limits */
1729 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1730 if (!transfer_to
[cnt
])
1732 transfer_from
[cnt
] = inode
->i_dquot
[cnt
];
1733 if (check_idq(transfer_to
[cnt
], 1, warntype_to
+ cnt
) ==
1734 NO_QUOTA
|| check_bdq(transfer_to
[cnt
], space
, 0,
1735 warntype_to
+ cnt
) == NO_QUOTA
)
1740 * Finally perform the needed transfer from transfer_from to transfer_to
1742 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1744 * Skip changes for same uid or gid or for turned off quota-type.
1746 if (!transfer_to
[cnt
])
1749 /* Due to IO error we might not have transfer_from[] structure */
1750 if (transfer_from
[cnt
]) {
1751 warntype_from_inodes
[cnt
] =
1752 info_idq_free(transfer_from
[cnt
], 1);
1753 warntype_from_space
[cnt
] =
1754 info_bdq_free(transfer_from
[cnt
], space
);
1755 dquot_decr_inodes(transfer_from
[cnt
], 1);
1756 dquot_decr_space(transfer_from
[cnt
], cur_space
);
1757 dquot_free_reserved_space(transfer_from
[cnt
],
1761 dquot_incr_inodes(transfer_to
[cnt
], 1);
1762 dquot_incr_space(transfer_to
[cnt
], cur_space
);
1763 dquot_resv_space(transfer_to
[cnt
], rsv_space
);
1765 inode
->i_dquot
[cnt
] = transfer_to
[cnt
];
1767 spin_unlock(&dq_data_lock
);
1768 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1770 mark_all_dquot_dirty(transfer_from
);
1771 mark_all_dquot_dirty(transfer_to
);
1772 /* The reference we got is transferred to the inode */
1773 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1774 transfer_to
[cnt
] = NULL
;
1776 flush_warnings(transfer_to
, warntype_to
);
1777 flush_warnings(transfer_from
, warntype_from_inodes
);
1778 flush_warnings(transfer_from
, warntype_from_space
);
1780 dqput_all(transfer_from
);
1781 dqput_all(transfer_to
);
1784 spin_unlock(&dq_data_lock
);
1785 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1786 /* Clear dquot pointers we don't want to dqput() */
1787 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1788 transfer_from
[cnt
] = NULL
;
1792 EXPORT_SYMBOL(dquot_transfer
);
1794 /* Wrapper for transferring ownership of an inode */
1795 int vfs_dq_transfer(struct inode
*inode
, struct iattr
*iattr
)
1797 if (sb_any_quota_active(inode
->i_sb
) && !IS_NOQUOTA(inode
)) {
1799 if (inode
->i_sb
->dq_op
->transfer(inode
, iattr
) == NO_QUOTA
)
1804 EXPORT_SYMBOL(vfs_dq_transfer
);
1807 * Write info of quota file to disk
1809 int dquot_commit_info(struct super_block
*sb
, int type
)
1812 struct quota_info
*dqopt
= sb_dqopt(sb
);
1814 mutex_lock(&dqopt
->dqio_mutex
);
1815 ret
= dqopt
->ops
[type
]->write_file_info(sb
, type
);
1816 mutex_unlock(&dqopt
->dqio_mutex
);
1819 EXPORT_SYMBOL(dquot_commit_info
);
1822 * Definitions of diskquota operations.
1824 const struct dquot_operations dquot_operations
= {
1825 .initialize
= dquot_initialize
,
1827 .alloc_space
= dquot_alloc_space
,
1828 .alloc_inode
= dquot_alloc_inode
,
1829 .free_space
= dquot_free_space
,
1830 .free_inode
= dquot_free_inode
,
1831 .transfer
= dquot_transfer
,
1832 .write_dquot
= dquot_commit
,
1833 .acquire_dquot
= dquot_acquire
,
1834 .release_dquot
= dquot_release
,
1835 .mark_dirty
= dquot_mark_dquot_dirty
,
1836 .write_info
= dquot_commit_info
,
1837 .alloc_dquot
= dquot_alloc
,
1838 .destroy_dquot
= dquot_destroy
,
1842 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1844 int vfs_quota_disable(struct super_block
*sb
, int type
, unsigned int flags
)
1847 struct quota_info
*dqopt
= sb_dqopt(sb
);
1848 struct inode
*toputinode
[MAXQUOTAS
];
1850 /* Cannot turn off usage accounting without turning off limits, or
1851 * suspend quotas and simultaneously turn quotas off. */
1852 if ((flags
& DQUOT_USAGE_ENABLED
&& !(flags
& DQUOT_LIMITS_ENABLED
))
1853 || (flags
& DQUOT_SUSPENDED
&& flags
& (DQUOT_LIMITS_ENABLED
|
1854 DQUOT_USAGE_ENABLED
)))
1857 /* We need to serialize quota_off() for device */
1858 mutex_lock(&dqopt
->dqonoff_mutex
);
1861 * Skip everything if there's nothing to do. We have to do this because
1862 * sometimes we are called when fill_super() failed and calling
1863 * sync_fs() in such cases does no good.
1865 if (!sb_any_quota_loaded(sb
)) {
1866 mutex_unlock(&dqopt
->dqonoff_mutex
);
1869 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1870 toputinode
[cnt
] = NULL
;
1871 if (type
!= -1 && cnt
!= type
)
1873 if (!sb_has_quota_loaded(sb
, cnt
))
1876 if (flags
& DQUOT_SUSPENDED
) {
1877 spin_lock(&dq_state_lock
);
1879 dquot_state_flag(DQUOT_SUSPENDED
, cnt
);
1880 spin_unlock(&dq_state_lock
);
1882 spin_lock(&dq_state_lock
);
1883 dqopt
->flags
&= ~dquot_state_flag(flags
, cnt
);
1884 /* Turning off suspended quotas? */
1885 if (!sb_has_quota_loaded(sb
, cnt
) &&
1886 sb_has_quota_suspended(sb
, cnt
)) {
1887 dqopt
->flags
&= ~dquot_state_flag(
1888 DQUOT_SUSPENDED
, cnt
);
1889 spin_unlock(&dq_state_lock
);
1890 iput(dqopt
->files
[cnt
]);
1891 dqopt
->files
[cnt
] = NULL
;
1894 spin_unlock(&dq_state_lock
);
1897 /* We still have to keep quota loaded? */
1898 if (sb_has_quota_loaded(sb
, cnt
) && !(flags
& DQUOT_SUSPENDED
))
1901 /* Note: these are blocking operations */
1902 drop_dquot_ref(sb
, cnt
);
1903 invalidate_dquots(sb
, cnt
);
1905 * Now all dquots should be invalidated, all writes done so we
1906 * should be only users of the info. No locks needed.
1908 if (info_dirty(&dqopt
->info
[cnt
]))
1909 sb
->dq_op
->write_info(sb
, cnt
);
1910 if (dqopt
->ops
[cnt
]->free_file_info
)
1911 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
1912 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
1914 toputinode
[cnt
] = dqopt
->files
[cnt
];
1915 if (!sb_has_quota_loaded(sb
, cnt
))
1916 dqopt
->files
[cnt
] = NULL
;
1917 dqopt
->info
[cnt
].dqi_flags
= 0;
1918 dqopt
->info
[cnt
].dqi_igrace
= 0;
1919 dqopt
->info
[cnt
].dqi_bgrace
= 0;
1920 dqopt
->ops
[cnt
] = NULL
;
1922 mutex_unlock(&dqopt
->dqonoff_mutex
);
1924 /* Skip syncing and setting flags if quota files are hidden */
1925 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
1928 /* Sync the superblock so that buffers with quota data are written to
1929 * disk (and so userspace sees correct data afterwards). */
1930 if (sb
->s_op
->sync_fs
)
1931 sb
->s_op
->sync_fs(sb
, 1);
1932 sync_blockdev(sb
->s_bdev
);
1933 /* Now the quota files are just ordinary files and we can set the
1934 * inode flags back. Moreover we discard the pagecache so that
1935 * userspace sees the writes we did bypassing the pagecache. We
1936 * must also discard the blockdev buffers so that we see the
1937 * changes done by userspace on the next quotaon() */
1938 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1939 if (toputinode
[cnt
]) {
1940 mutex_lock(&dqopt
->dqonoff_mutex
);
1941 /* If quota was reenabled in the meantime, we have
1943 if (!sb_has_quota_loaded(sb
, cnt
)) {
1944 mutex_lock_nested(&toputinode
[cnt
]->i_mutex
,
1946 toputinode
[cnt
]->i_flags
&= ~(S_IMMUTABLE
|
1947 S_NOATIME
| S_NOQUOTA
);
1948 truncate_inode_pages(&toputinode
[cnt
]->i_data
,
1950 mutex_unlock(&toputinode
[cnt
]->i_mutex
);
1951 mark_inode_dirty(toputinode
[cnt
]);
1953 mutex_unlock(&dqopt
->dqonoff_mutex
);
1956 invalidate_bdev(sb
->s_bdev
);
1958 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1959 if (toputinode
[cnt
]) {
1960 /* On remount RO, we keep the inode pointer so that we
1961 * can reenable quota on the subsequent remount RW. We
1962 * have to check 'flags' variable and not use sb_has_
1963 * function because another quotaon / quotaoff could
1964 * change global state before we got here. We refuse
1965 * to suspend quotas when there is pending delete on
1966 * the quota file... */
1967 if (!(flags
& DQUOT_SUSPENDED
))
1968 iput(toputinode
[cnt
]);
1969 else if (!toputinode
[cnt
]->i_nlink
)
1974 EXPORT_SYMBOL(vfs_quota_disable
);
1976 int vfs_quota_off(struct super_block
*sb
, int type
, int remount
)
1978 return vfs_quota_disable(sb
, type
, remount
? DQUOT_SUSPENDED
:
1979 (DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
));
1981 EXPORT_SYMBOL(vfs_quota_off
);
1983 * Turn quotas on on a device
1987 * Helper function to turn quotas on when we already have the inode of
1988 * quota file and no quota information is loaded.
1990 static int vfs_load_quota_inode(struct inode
*inode
, int type
, int format_id
,
1993 struct quota_format_type
*fmt
= find_quota_format(format_id
);
1994 struct super_block
*sb
= inode
->i_sb
;
1995 struct quota_info
*dqopt
= sb_dqopt(sb
);
2001 if (!S_ISREG(inode
->i_mode
)) {
2005 if (IS_RDONLY(inode
)) {
2009 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
) {
2013 /* Usage always has to be set... */
2014 if (!(flags
& DQUOT_USAGE_ENABLED
)) {
2019 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2020 /* As we bypass the pagecache we must now flush the inode so
2021 * that we see all the changes from userspace... */
2022 write_inode_now(inode
, 1);
2023 /* And now flush the block cache so that kernel sees the
2025 invalidate_bdev(sb
->s_bdev
);
2027 mutex_lock(&dqopt
->dqonoff_mutex
);
2028 if (sb_has_quota_loaded(sb
, type
)) {
2033 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2034 /* We don't want quota and atime on quota files (deadlocks
2035 * possible) Also nobody should write to the file - we use
2036 * special IO operations which ignore the immutable bit. */
2037 down_write(&dqopt
->dqptr_sem
);
2038 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
2039 oldflags
= inode
->i_flags
& (S_NOATIME
| S_IMMUTABLE
|
2041 inode
->i_flags
|= S_NOQUOTA
| S_NOATIME
| S_IMMUTABLE
;
2042 mutex_unlock(&inode
->i_mutex
);
2043 up_write(&dqopt
->dqptr_sem
);
2044 sb
->dq_op
->drop(inode
);
2048 dqopt
->files
[type
] = igrab(inode
);
2049 if (!dqopt
->files
[type
])
2052 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
2055 dqopt
->ops
[type
] = fmt
->qf_ops
;
2056 dqopt
->info
[type
].dqi_format
= fmt
;
2057 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
2058 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
2059 mutex_lock(&dqopt
->dqio_mutex
);
2060 error
= dqopt
->ops
[type
]->read_file_info(sb
, type
);
2062 mutex_unlock(&dqopt
->dqio_mutex
);
2065 mutex_unlock(&dqopt
->dqio_mutex
);
2066 spin_lock(&dq_state_lock
);
2067 dqopt
->flags
|= dquot_state_flag(flags
, type
);
2068 spin_unlock(&dq_state_lock
);
2070 add_dquot_ref(sb
, type
);
2071 mutex_unlock(&dqopt
->dqonoff_mutex
);
2076 dqopt
->files
[type
] = NULL
;
2079 if (oldflags
!= -1) {
2080 down_write(&dqopt
->dqptr_sem
);
2081 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
2082 /* Set the flags back (in the case of accidental quotaon()
2083 * on a wrong file we don't want to mess up the flags) */
2084 inode
->i_flags
&= ~(S_NOATIME
| S_NOQUOTA
| S_IMMUTABLE
);
2085 inode
->i_flags
|= oldflags
;
2086 mutex_unlock(&inode
->i_mutex
);
2087 up_write(&dqopt
->dqptr_sem
);
2089 mutex_unlock(&dqopt
->dqonoff_mutex
);
2091 put_quota_format(fmt
);
2096 /* Reenable quotas on remount RW */
2097 static int vfs_quota_on_remount(struct super_block
*sb
, int type
)
2099 struct quota_info
*dqopt
= sb_dqopt(sb
);
2100 struct inode
*inode
;
2104 mutex_lock(&dqopt
->dqonoff_mutex
);
2105 if (!sb_has_quota_suspended(sb
, type
)) {
2106 mutex_unlock(&dqopt
->dqonoff_mutex
);
2109 inode
= dqopt
->files
[type
];
2110 dqopt
->files
[type
] = NULL
;
2111 spin_lock(&dq_state_lock
);
2112 flags
= dqopt
->flags
& dquot_state_flag(DQUOT_USAGE_ENABLED
|
2113 DQUOT_LIMITS_ENABLED
, type
);
2114 dqopt
->flags
&= ~dquot_state_flag(DQUOT_STATE_FLAGS
, type
);
2115 spin_unlock(&dq_state_lock
);
2116 mutex_unlock(&dqopt
->dqonoff_mutex
);
2118 flags
= dquot_generic_flag(flags
, type
);
2119 ret
= vfs_load_quota_inode(inode
, type
, dqopt
->info
[type
].dqi_fmt_id
,
2126 int vfs_quota_on_path(struct super_block
*sb
, int type
, int format_id
,
2129 int error
= security_quota_on(path
->dentry
);
2132 /* Quota file not on the same filesystem? */
2133 if (path
->mnt
->mnt_sb
!= sb
)
2136 error
= vfs_load_quota_inode(path
->dentry
->d_inode
, type
,
2137 format_id
, DQUOT_USAGE_ENABLED
|
2138 DQUOT_LIMITS_ENABLED
);
2141 EXPORT_SYMBOL(vfs_quota_on_path
);
2143 int vfs_quota_on(struct super_block
*sb
, int type
, int format_id
, char *name
,
2150 return vfs_quota_on_remount(sb
, type
);
2152 error
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
2154 error
= vfs_quota_on_path(sb
, type
, format_id
, &path
);
2159 EXPORT_SYMBOL(vfs_quota_on
);
2162 * More powerful function for turning on quotas allowing setting
2163 * of individual quota flags
2165 int vfs_quota_enable(struct inode
*inode
, int type
, int format_id
,
2169 struct super_block
*sb
= inode
->i_sb
;
2170 struct quota_info
*dqopt
= sb_dqopt(sb
);
2172 /* Just unsuspend quotas? */
2173 if (flags
& DQUOT_SUSPENDED
)
2174 return vfs_quota_on_remount(sb
, type
);
2177 /* Just updating flags needed? */
2178 if (sb_has_quota_loaded(sb
, type
)) {
2179 mutex_lock(&dqopt
->dqonoff_mutex
);
2180 /* Now do a reliable test... */
2181 if (!sb_has_quota_loaded(sb
, type
)) {
2182 mutex_unlock(&dqopt
->dqonoff_mutex
);
2185 if (flags
& DQUOT_USAGE_ENABLED
&&
2186 sb_has_quota_usage_enabled(sb
, type
)) {
2190 if (flags
& DQUOT_LIMITS_ENABLED
&&
2191 sb_has_quota_limits_enabled(sb
, type
)) {
2195 spin_lock(&dq_state_lock
);
2196 sb_dqopt(sb
)->flags
|= dquot_state_flag(flags
, type
);
2197 spin_unlock(&dq_state_lock
);
2199 mutex_unlock(&dqopt
->dqonoff_mutex
);
2204 return vfs_load_quota_inode(inode
, type
, format_id
, flags
);
2206 EXPORT_SYMBOL(vfs_quota_enable
);
2209 * This function is used when filesystem needs to initialize quotas
2210 * during mount time.
2212 int vfs_quota_on_mount(struct super_block
*sb
, char *qf_name
,
2213 int format_id
, int type
)
2215 struct dentry
*dentry
;
2218 mutex_lock(&sb
->s_root
->d_inode
->i_mutex
);
2219 dentry
= lookup_one_len(qf_name
, sb
->s_root
, strlen(qf_name
));
2220 mutex_unlock(&sb
->s_root
->d_inode
->i_mutex
);
2222 return PTR_ERR(dentry
);
2224 if (!dentry
->d_inode
) {
2229 error
= security_quota_on(dentry
);
2231 error
= vfs_load_quota_inode(dentry
->d_inode
, type
, format_id
,
2232 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2238 EXPORT_SYMBOL(vfs_quota_on_mount
);
2240 /* Wrapper to turn on quotas when remounting rw */
2241 int vfs_dq_quota_on_remount(struct super_block
*sb
)
2246 if (!sb
->s_qcop
|| !sb
->s_qcop
->quota_on
)
2248 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2249 err
= sb
->s_qcop
->quota_on(sb
, cnt
, 0, NULL
, 1);
2250 if (err
< 0 && !ret
)
2255 EXPORT_SYMBOL(vfs_dq_quota_on_remount
);
2257 static inline qsize_t
qbtos(qsize_t blocks
)
2259 return blocks
<< QIF_DQBLKSIZE_BITS
;
2262 static inline qsize_t
stoqb(qsize_t space
)
2264 return (space
+ QIF_DQBLKSIZE
- 1) >> QIF_DQBLKSIZE_BITS
;
2267 /* Generic routine for getting common part of quota structure */
2268 static void do_get_dqblk(struct dquot
*dquot
, struct if_dqblk
*di
)
2270 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2272 spin_lock(&dq_data_lock
);
2273 di
->dqb_bhardlimit
= stoqb(dm
->dqb_bhardlimit
);
2274 di
->dqb_bsoftlimit
= stoqb(dm
->dqb_bsoftlimit
);
2275 di
->dqb_curspace
= dm
->dqb_curspace
+ dm
->dqb_rsvspace
;
2276 di
->dqb_ihardlimit
= dm
->dqb_ihardlimit
;
2277 di
->dqb_isoftlimit
= dm
->dqb_isoftlimit
;
2278 di
->dqb_curinodes
= dm
->dqb_curinodes
;
2279 di
->dqb_btime
= dm
->dqb_btime
;
2280 di
->dqb_itime
= dm
->dqb_itime
;
2281 di
->dqb_valid
= QIF_ALL
;
2282 spin_unlock(&dq_data_lock
);
2285 int vfs_get_dqblk(struct super_block
*sb
, int type
, qid_t id
,
2286 struct if_dqblk
*di
)
2288 struct dquot
*dquot
;
2290 dquot
= dqget(sb
, id
, type
);
2293 do_get_dqblk(dquot
, di
);
2298 EXPORT_SYMBOL(vfs_get_dqblk
);
2300 /* Generic routine for setting common part of quota structure */
2301 static int do_set_dqblk(struct dquot
*dquot
, struct if_dqblk
*di
)
2303 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2304 int check_blim
= 0, check_ilim
= 0;
2305 struct mem_dqinfo
*dqi
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
2307 if ((di
->dqb_valid
& QIF_BLIMITS
&&
2308 (di
->dqb_bhardlimit
> dqi
->dqi_maxblimit
||
2309 di
->dqb_bsoftlimit
> dqi
->dqi_maxblimit
)) ||
2310 (di
->dqb_valid
& QIF_ILIMITS
&&
2311 (di
->dqb_ihardlimit
> dqi
->dqi_maxilimit
||
2312 di
->dqb_isoftlimit
> dqi
->dqi_maxilimit
)))
2315 spin_lock(&dq_data_lock
);
2316 if (di
->dqb_valid
& QIF_SPACE
) {
2317 dm
->dqb_curspace
= di
->dqb_curspace
- dm
->dqb_rsvspace
;
2319 set_bit(DQ_LASTSET_B
+ QIF_SPACE_B
, &dquot
->dq_flags
);
2321 if (di
->dqb_valid
& QIF_BLIMITS
) {
2322 dm
->dqb_bsoftlimit
= qbtos(di
->dqb_bsoftlimit
);
2323 dm
->dqb_bhardlimit
= qbtos(di
->dqb_bhardlimit
);
2325 set_bit(DQ_LASTSET_B
+ QIF_BLIMITS_B
, &dquot
->dq_flags
);
2327 if (di
->dqb_valid
& QIF_INODES
) {
2328 dm
->dqb_curinodes
= di
->dqb_curinodes
;
2330 set_bit(DQ_LASTSET_B
+ QIF_INODES_B
, &dquot
->dq_flags
);
2332 if (di
->dqb_valid
& QIF_ILIMITS
) {
2333 dm
->dqb_isoftlimit
= di
->dqb_isoftlimit
;
2334 dm
->dqb_ihardlimit
= di
->dqb_ihardlimit
;
2336 set_bit(DQ_LASTSET_B
+ QIF_ILIMITS_B
, &dquot
->dq_flags
);
2338 if (di
->dqb_valid
& QIF_BTIME
) {
2339 dm
->dqb_btime
= di
->dqb_btime
;
2341 set_bit(DQ_LASTSET_B
+ QIF_BTIME_B
, &dquot
->dq_flags
);
2343 if (di
->dqb_valid
& QIF_ITIME
) {
2344 dm
->dqb_itime
= di
->dqb_itime
;
2346 set_bit(DQ_LASTSET_B
+ QIF_ITIME_B
, &dquot
->dq_flags
);
2350 if (!dm
->dqb_bsoftlimit
||
2351 dm
->dqb_curspace
< dm
->dqb_bsoftlimit
) {
2353 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
2354 } else if (!(di
->dqb_valid
& QIF_BTIME
))
2355 /* Set grace only if user hasn't provided his own... */
2356 dm
->dqb_btime
= get_seconds() + dqi
->dqi_bgrace
;
2359 if (!dm
->dqb_isoftlimit
||
2360 dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
2362 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
2363 } else if (!(di
->dqb_valid
& QIF_ITIME
))
2364 /* Set grace only if user hasn't provided his own... */
2365 dm
->dqb_itime
= get_seconds() + dqi
->dqi_igrace
;
2367 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
||
2369 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2371 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2372 spin_unlock(&dq_data_lock
);
2373 mark_dquot_dirty(dquot
);
2378 int vfs_set_dqblk(struct super_block
*sb
, int type
, qid_t id
,
2379 struct if_dqblk
*di
)
2381 struct dquot
*dquot
;
2384 dquot
= dqget(sb
, id
, type
);
2389 rc
= do_set_dqblk(dquot
, di
);
2394 EXPORT_SYMBOL(vfs_set_dqblk
);
2396 /* Generic routine for getting common part of quota file information */
2397 int vfs_get_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2399 struct mem_dqinfo
*mi
;
2401 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2402 if (!sb_has_quota_active(sb
, type
)) {
2403 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2406 mi
= sb_dqopt(sb
)->info
+ type
;
2407 spin_lock(&dq_data_lock
);
2408 ii
->dqi_bgrace
= mi
->dqi_bgrace
;
2409 ii
->dqi_igrace
= mi
->dqi_igrace
;
2410 ii
->dqi_flags
= mi
->dqi_flags
& DQF_MASK
;
2411 ii
->dqi_valid
= IIF_ALL
;
2412 spin_unlock(&dq_data_lock
);
2413 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2416 EXPORT_SYMBOL(vfs_get_dqinfo
);
2418 /* Generic routine for setting common part of quota file information */
2419 int vfs_set_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2421 struct mem_dqinfo
*mi
;
2424 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2425 if (!sb_has_quota_active(sb
, type
)) {
2429 mi
= sb_dqopt(sb
)->info
+ type
;
2430 spin_lock(&dq_data_lock
);
2431 if (ii
->dqi_valid
& IIF_BGRACE
)
2432 mi
->dqi_bgrace
= ii
->dqi_bgrace
;
2433 if (ii
->dqi_valid
& IIF_IGRACE
)
2434 mi
->dqi_igrace
= ii
->dqi_igrace
;
2435 if (ii
->dqi_valid
& IIF_FLAGS
)
2436 mi
->dqi_flags
= (mi
->dqi_flags
& ~DQF_MASK
) |
2437 (ii
->dqi_flags
& DQF_MASK
);
2438 spin_unlock(&dq_data_lock
);
2439 mark_info_dirty(sb
, type
);
2440 /* Force write to disk */
2441 sb
->dq_op
->write_info(sb
, type
);
2443 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2446 EXPORT_SYMBOL(vfs_set_dqinfo
);
2448 const struct quotactl_ops vfs_quotactl_ops
= {
2449 .quota_on
= vfs_quota_on
,
2450 .quota_off
= vfs_quota_off
,
2451 .quota_sync
= vfs_quota_sync
,
2452 .get_info
= vfs_get_dqinfo
,
2453 .set_info
= vfs_set_dqinfo
,
2454 .get_dqblk
= vfs_get_dqblk
,
2455 .set_dqblk
= vfs_set_dqblk
2458 static ctl_table fs_dqstats_table
[] = {
2460 .procname
= "lookups",
2461 .data
= &dqstats
.lookups
,
2462 .maxlen
= sizeof(int),
2464 .proc_handler
= proc_dointvec
,
2467 .procname
= "drops",
2468 .data
= &dqstats
.drops
,
2469 .maxlen
= sizeof(int),
2471 .proc_handler
= proc_dointvec
,
2474 .procname
= "reads",
2475 .data
= &dqstats
.reads
,
2476 .maxlen
= sizeof(int),
2478 .proc_handler
= proc_dointvec
,
2481 .procname
= "writes",
2482 .data
= &dqstats
.writes
,
2483 .maxlen
= sizeof(int),
2485 .proc_handler
= proc_dointvec
,
2488 .procname
= "cache_hits",
2489 .data
= &dqstats
.cache_hits
,
2490 .maxlen
= sizeof(int),
2492 .proc_handler
= proc_dointvec
,
2495 .procname
= "allocated_dquots",
2496 .data
= &dqstats
.allocated_dquots
,
2497 .maxlen
= sizeof(int),
2499 .proc_handler
= proc_dointvec
,
2502 .procname
= "free_dquots",
2503 .data
= &dqstats
.free_dquots
,
2504 .maxlen
= sizeof(int),
2506 .proc_handler
= proc_dointvec
,
2509 .procname
= "syncs",
2510 .data
= &dqstats
.syncs
,
2511 .maxlen
= sizeof(int),
2513 .proc_handler
= proc_dointvec
,
2515 #ifdef CONFIG_PRINT_QUOTA_WARNING
2517 .procname
= "warnings",
2518 .data
= &flag_print_warnings
,
2519 .maxlen
= sizeof(int),
2521 .proc_handler
= proc_dointvec
,
2527 static ctl_table fs_table
[] = {
2529 .procname
= "quota",
2531 .child
= fs_dqstats_table
,
2536 static ctl_table sys_table
[] = {
2545 static int __init
dquot_init(void)
2548 unsigned long nr_hash
, order
;
2550 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2552 register_sysctl_table(sys_table
);
2554 dquot_cachep
= kmem_cache_create("dquot",
2555 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2556 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2557 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2561 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
2563 panic("Cannot create dquot hash table");
2565 /* Find power-of-two hlist_heads which can fit into allocation */
2566 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2570 } while (nr_hash
>> dq_hash_bits
);
2573 nr_hash
= 1UL << dq_hash_bits
;
2574 dq_hash_mask
= nr_hash
- 1;
2575 for (i
= 0; i
< nr_hash
; i
++)
2576 INIT_HLIST_HEAD(dquot_hash
+ i
);
2578 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2579 nr_hash
, order
, (PAGE_SIZE
<< order
));
2581 register_shrinker(&dqcache_shrinker
);
2585 module_init(dquot_init
);