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 * Special care needs to be taken about S_NOQUOTA inode flag (marking that
105 * inode is a quota file). Functions adding pointers from inode to dquots have
106 * to check this flag under dqptr_sem and then (if S_NOQUOTA is not set) they
107 * have to do all pointer modifications before dropping dqptr_sem. This makes
108 * sure they cannot race with quotaon which first sets S_NOQUOTA flag and
109 * then drops all pointers to dquots from an inode.
111 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
112 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
113 * Currently dquot is locked only when it is being read to memory (or space for
114 * it is being allocated) on the first dqget() and when it is being released on
115 * the last dqput(). The allocation and release oparations are serialized by
116 * the dq_lock and by checking the use count in dquot_release(). Write
117 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
118 * spinlock to internal buffers before writing.
120 * Lock ordering (including related VFS locks) is the following:
121 * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
123 * The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
124 * dqptr_sem. But filesystem has to count with the fact that functions such as
125 * dquot_alloc_space() acquire dqptr_sem and they usually have to be called
126 * from inside a transaction to keep filesystem consistency after a crash. Also
127 * filesystems usually want to do some IO on dquot from ->mark_dirty which is
128 * called with dqptr_sem held.
129 * i_mutex on quota files is special (it's below dqio_mutex)
132 static __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_list_lock
);
133 static __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_state_lock
);
134 __cacheline_aligned_in_smp
DEFINE_SPINLOCK(dq_data_lock
);
135 EXPORT_SYMBOL(dq_data_lock
);
137 static char *quotatypes
[] = INITQFNAMES
;
138 static struct quota_format_type
*quota_formats
; /* List of registered formats */
139 static struct quota_module_name module_names
[] = INIT_QUOTA_MODULE_NAMES
;
141 /* SLAB cache for dquot structures */
142 static struct kmem_cache
*dquot_cachep
;
144 int register_quota_format(struct quota_format_type
*fmt
)
146 spin_lock(&dq_list_lock
);
147 fmt
->qf_next
= quota_formats
;
149 spin_unlock(&dq_list_lock
);
152 EXPORT_SYMBOL(register_quota_format
);
154 void unregister_quota_format(struct quota_format_type
*fmt
)
156 struct quota_format_type
**actqf
;
158 spin_lock(&dq_list_lock
);
159 for (actqf
= "a_formats
; *actqf
&& *actqf
!= fmt
;
160 actqf
= &(*actqf
)->qf_next
)
163 *actqf
= (*actqf
)->qf_next
;
164 spin_unlock(&dq_list_lock
);
166 EXPORT_SYMBOL(unregister_quota_format
);
168 static struct quota_format_type
*find_quota_format(int id
)
170 struct quota_format_type
*actqf
;
172 spin_lock(&dq_list_lock
);
173 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
174 actqf
= actqf
->qf_next
)
176 if (!actqf
|| !try_module_get(actqf
->qf_owner
)) {
179 spin_unlock(&dq_list_lock
);
181 for (qm
= 0; module_names
[qm
].qm_fmt_id
&&
182 module_names
[qm
].qm_fmt_id
!= id
; qm
++)
184 if (!module_names
[qm
].qm_fmt_id
||
185 request_module(module_names
[qm
].qm_mod_name
))
188 spin_lock(&dq_list_lock
);
189 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
;
190 actqf
= actqf
->qf_next
)
192 if (actqf
&& !try_module_get(actqf
->qf_owner
))
195 spin_unlock(&dq_list_lock
);
199 static void put_quota_format(struct quota_format_type
*fmt
)
201 module_put(fmt
->qf_owner
);
205 * Dquot List Management:
206 * The quota code uses three lists for dquot management: the inuse_list,
207 * free_dquots, and dquot_hash[] array. A single dquot structure may be
208 * on all three lists, depending on its current state.
210 * All dquots are placed to the end of inuse_list when first created, and this
211 * list is used for invalidate operation, which must look at every dquot.
213 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
214 * and this list is searched whenever we need an available dquot. Dquots are
215 * removed from the list as soon as they are used again, and
216 * dqstats.free_dquots gives the number of dquots on the list. When
217 * dquot is invalidated it's completely released from memory.
219 * Dquots with a specific identity (device, type and id) are placed on
220 * one of the dquot_hash[] hash chains. The provides an efficient search
221 * mechanism to locate a specific dquot.
224 static LIST_HEAD(inuse_list
);
225 static LIST_HEAD(free_dquots
);
226 static unsigned int dq_hash_bits
, dq_hash_mask
;
227 static struct hlist_head
*dquot_hash
;
229 struct dqstats dqstats
;
230 EXPORT_SYMBOL(dqstats
);
232 static qsize_t
inode_get_rsv_space(struct inode
*inode
);
234 static inline unsigned int
235 hashfn(const struct super_block
*sb
, unsigned int id
, int type
)
239 tmp
= (((unsigned long)sb
>>L1_CACHE_SHIFT
) ^ id
) * (MAXQUOTAS
- type
);
240 return (tmp
+ (tmp
>> dq_hash_bits
)) & dq_hash_mask
;
244 * Following list functions expect dq_list_lock to be held
246 static inline void insert_dquot_hash(struct dquot
*dquot
)
248 struct hlist_head
*head
;
249 head
= dquot_hash
+ hashfn(dquot
->dq_sb
, dquot
->dq_id
, dquot
->dq_type
);
250 hlist_add_head(&dquot
->dq_hash
, head
);
253 static inline void remove_dquot_hash(struct dquot
*dquot
)
255 hlist_del_init(&dquot
->dq_hash
);
258 static struct dquot
*find_dquot(unsigned int hashent
, struct super_block
*sb
,
259 unsigned int id
, int type
)
261 struct hlist_node
*node
;
264 hlist_for_each (node
, dquot_hash
+hashent
) {
265 dquot
= hlist_entry(node
, struct dquot
, dq_hash
);
266 if (dquot
->dq_sb
== sb
&& dquot
->dq_id
== id
&&
267 dquot
->dq_type
== type
)
273 /* Add a dquot to the tail of the free list */
274 static inline void put_dquot_last(struct dquot
*dquot
)
276 list_add_tail(&dquot
->dq_free
, &free_dquots
);
277 dqstats
.free_dquots
++;
280 static inline void remove_free_dquot(struct dquot
*dquot
)
282 if (list_empty(&dquot
->dq_free
))
284 list_del_init(&dquot
->dq_free
);
285 dqstats
.free_dquots
--;
288 static inline void put_inuse(struct dquot
*dquot
)
290 /* We add to the back of inuse list so we don't have to restart
291 * when traversing this list and we block */
292 list_add_tail(&dquot
->dq_inuse
, &inuse_list
);
293 dqstats
.allocated_dquots
++;
296 static inline void remove_inuse(struct dquot
*dquot
)
298 dqstats
.allocated_dquots
--;
299 list_del(&dquot
->dq_inuse
);
302 * End of list functions needing dq_list_lock
305 static void wait_on_dquot(struct dquot
*dquot
)
307 mutex_lock(&dquot
->dq_lock
);
308 mutex_unlock(&dquot
->dq_lock
);
311 static inline int dquot_dirty(struct dquot
*dquot
)
313 return test_bit(DQ_MOD_B
, &dquot
->dq_flags
);
316 static inline int mark_dquot_dirty(struct dquot
*dquot
)
318 return dquot
->dq_sb
->dq_op
->mark_dirty(dquot
);
321 int dquot_mark_dquot_dirty(struct dquot
*dquot
)
323 spin_lock(&dq_list_lock
);
324 if (!test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
))
325 list_add(&dquot
->dq_dirty
, &sb_dqopt(dquot
->dq_sb
)->
326 info
[dquot
->dq_type
].dqi_dirty_list
);
327 spin_unlock(&dq_list_lock
);
330 EXPORT_SYMBOL(dquot_mark_dquot_dirty
);
332 /* Dirtify all the dquots - this can block when journalling */
333 static inline int mark_all_dquot_dirty(struct dquot
* const *dquot
)
338 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
340 /* Even in case of error we have to continue */
341 ret
= mark_dquot_dirty(dquot
[cnt
]);
348 static inline void dqput_all(struct dquot
**dquot
)
352 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
356 /* This function needs dq_list_lock */
357 static inline int clear_dquot_dirty(struct dquot
*dquot
)
359 if (!test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
))
361 list_del_init(&dquot
->dq_dirty
);
365 void mark_info_dirty(struct super_block
*sb
, int type
)
367 set_bit(DQF_INFO_DIRTY_B
, &sb_dqopt(sb
)->info
[type
].dqi_flags
);
369 EXPORT_SYMBOL(mark_info_dirty
);
372 * Read dquot from disk and alloc space for it
375 int dquot_acquire(struct dquot
*dquot
)
377 int ret
= 0, ret2
= 0;
378 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
380 mutex_lock(&dquot
->dq_lock
);
381 mutex_lock(&dqopt
->dqio_mutex
);
382 if (!test_bit(DQ_READ_B
, &dquot
->dq_flags
))
383 ret
= dqopt
->ops
[dquot
->dq_type
]->read_dqblk(dquot
);
386 set_bit(DQ_READ_B
, &dquot
->dq_flags
);
387 /* Instantiate dquot if needed */
388 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && !dquot
->dq_off
) {
389 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
390 /* Write the info if needed */
391 if (info_dirty(&dqopt
->info
[dquot
->dq_type
])) {
392 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(
393 dquot
->dq_sb
, dquot
->dq_type
);
402 set_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
404 mutex_unlock(&dqopt
->dqio_mutex
);
405 mutex_unlock(&dquot
->dq_lock
);
408 EXPORT_SYMBOL(dquot_acquire
);
411 * Write dquot to disk
413 int dquot_commit(struct dquot
*dquot
)
415 int ret
= 0, ret2
= 0;
416 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
418 mutex_lock(&dqopt
->dqio_mutex
);
419 spin_lock(&dq_list_lock
);
420 if (!clear_dquot_dirty(dquot
)) {
421 spin_unlock(&dq_list_lock
);
424 spin_unlock(&dq_list_lock
);
425 /* Inactive dquot can be only if there was error during read/init
426 * => we have better not writing it */
427 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
428 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
429 if (info_dirty(&dqopt
->info
[dquot
->dq_type
])) {
430 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(
431 dquot
->dq_sb
, dquot
->dq_type
);
437 mutex_unlock(&dqopt
->dqio_mutex
);
440 EXPORT_SYMBOL(dquot_commit
);
445 int dquot_release(struct dquot
*dquot
)
447 int ret
= 0, ret2
= 0;
448 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
450 mutex_lock(&dquot
->dq_lock
);
451 /* Check whether we are not racing with some other dqget() */
452 if (atomic_read(&dquot
->dq_count
) > 1)
454 mutex_lock(&dqopt
->dqio_mutex
);
455 if (dqopt
->ops
[dquot
->dq_type
]->release_dqblk
) {
456 ret
= dqopt
->ops
[dquot
->dq_type
]->release_dqblk(dquot
);
458 if (info_dirty(&dqopt
->info
[dquot
->dq_type
])) {
459 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(
460 dquot
->dq_sb
, dquot
->dq_type
);
465 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
466 mutex_unlock(&dqopt
->dqio_mutex
);
468 mutex_unlock(&dquot
->dq_lock
);
471 EXPORT_SYMBOL(dquot_release
);
473 void dquot_destroy(struct dquot
*dquot
)
475 kmem_cache_free(dquot_cachep
, dquot
);
477 EXPORT_SYMBOL(dquot_destroy
);
479 static inline void do_destroy_dquot(struct dquot
*dquot
)
481 dquot
->dq_sb
->dq_op
->destroy_dquot(dquot
);
484 /* Invalidate all dquots on the list. Note that this function is called after
485 * quota is disabled and pointers from inodes removed so there cannot be new
486 * quota users. There can still be some users of quotas due to inodes being
487 * just deleted or pruned by prune_icache() (those are not attached to any
488 * list) or parallel quotactl call. We have to wait for such users.
490 static void invalidate_dquots(struct super_block
*sb
, int type
)
492 struct dquot
*dquot
, *tmp
;
495 spin_lock(&dq_list_lock
);
496 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
497 if (dquot
->dq_sb
!= sb
)
499 if (dquot
->dq_type
!= type
)
501 /* Wait for dquot users */
502 if (atomic_read(&dquot
->dq_count
)) {
505 atomic_inc(&dquot
->dq_count
);
506 prepare_to_wait(&dquot
->dq_wait_unused
, &wait
,
507 TASK_UNINTERRUPTIBLE
);
508 spin_unlock(&dq_list_lock
);
509 /* Once dqput() wakes us up, we know it's time to free
511 * IMPORTANT: we rely on the fact that there is always
512 * at most one process waiting for dquot to free.
513 * Otherwise dq_count would be > 1 and we would never
516 if (atomic_read(&dquot
->dq_count
) > 1)
518 finish_wait(&dquot
->dq_wait_unused
, &wait
);
520 /* At this moment dquot() need not exist (it could be
521 * reclaimed by prune_dqcache(). Hence we must
526 * Quota now has no users and it has been written on last
529 remove_dquot_hash(dquot
);
530 remove_free_dquot(dquot
);
532 do_destroy_dquot(dquot
);
534 spin_unlock(&dq_list_lock
);
537 /* Call callback for every active dquot on given filesystem */
538 int dquot_scan_active(struct super_block
*sb
,
539 int (*fn
)(struct dquot
*dquot
, unsigned long priv
),
542 struct dquot
*dquot
, *old_dquot
= NULL
;
545 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
546 spin_lock(&dq_list_lock
);
547 list_for_each_entry(dquot
, &inuse_list
, dq_inuse
) {
548 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
550 if (dquot
->dq_sb
!= sb
)
552 /* Now we have active dquot so we can just increase use count */
553 atomic_inc(&dquot
->dq_count
);
555 spin_unlock(&dq_list_lock
);
558 ret
= fn(dquot
, priv
);
561 spin_lock(&dq_list_lock
);
562 /* We are safe to continue now because our dquot could not
563 * be moved out of the inuse list while we hold the reference */
565 spin_unlock(&dq_list_lock
);
568 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
571 EXPORT_SYMBOL(dquot_scan_active
);
573 int vfs_quota_sync(struct super_block
*sb
, int type
, int wait
)
575 struct list_head
*dirty
;
577 struct quota_info
*dqopt
= sb_dqopt(sb
);
580 mutex_lock(&dqopt
->dqonoff_mutex
);
581 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
582 if (type
!= -1 && cnt
!= type
)
584 if (!sb_has_quota_active(sb
, cnt
))
586 spin_lock(&dq_list_lock
);
587 dirty
= &dqopt
->info
[cnt
].dqi_dirty_list
;
588 while (!list_empty(dirty
)) {
589 dquot
= list_first_entry(dirty
, struct dquot
,
591 /* Dirty and inactive can be only bad dquot... */
592 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
593 clear_dquot_dirty(dquot
);
596 /* Now we have active dquot from which someone is
597 * holding reference so we can safely just increase
599 atomic_inc(&dquot
->dq_count
);
601 spin_unlock(&dq_list_lock
);
602 sb
->dq_op
->write_dquot(dquot
);
604 spin_lock(&dq_list_lock
);
606 spin_unlock(&dq_list_lock
);
609 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
610 if ((cnt
== type
|| type
== -1) && sb_has_quota_active(sb
, cnt
)
611 && info_dirty(&dqopt
->info
[cnt
]))
612 sb
->dq_op
->write_info(sb
, cnt
);
613 spin_lock(&dq_list_lock
);
615 spin_unlock(&dq_list_lock
);
616 mutex_unlock(&dqopt
->dqonoff_mutex
);
618 if (!wait
|| (sb_dqopt(sb
)->flags
& DQUOT_QUOTA_SYS_FILE
))
621 /* This is not very clever (and fast) but currently I don't know about
622 * any other simple way of getting quota data to disk and we must get
623 * them there for userspace to be visible... */
624 if (sb
->s_op
->sync_fs
)
625 sb
->s_op
->sync_fs(sb
, 1);
626 sync_blockdev(sb
->s_bdev
);
629 * Now when everything is written we can discard the pagecache so
630 * that userspace sees the changes.
632 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
633 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
634 if (type
!= -1 && cnt
!= type
)
636 if (!sb_has_quota_active(sb
, cnt
))
638 mutex_lock_nested(&sb_dqopt(sb
)->files
[cnt
]->i_mutex
,
640 truncate_inode_pages(&sb_dqopt(sb
)->files
[cnt
]->i_data
, 0);
641 mutex_unlock(&sb_dqopt(sb
)->files
[cnt
]->i_mutex
);
643 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
647 EXPORT_SYMBOL(vfs_quota_sync
);
649 /* Free unused dquots from cache */
650 static void prune_dqcache(int count
)
652 struct list_head
*head
;
655 head
= free_dquots
.prev
;
656 while (head
!= &free_dquots
&& count
) {
657 dquot
= list_entry(head
, struct dquot
, dq_free
);
658 remove_dquot_hash(dquot
);
659 remove_free_dquot(dquot
);
661 do_destroy_dquot(dquot
);
663 head
= free_dquots
.prev
;
668 * This is called from kswapd when we think we need some
672 static int shrink_dqcache_memory(int nr
, gfp_t gfp_mask
)
675 spin_lock(&dq_list_lock
);
677 spin_unlock(&dq_list_lock
);
679 return (dqstats
.free_dquots
/ 100) * sysctl_vfs_cache_pressure
;
682 static struct shrinker dqcache_shrinker
= {
683 .shrink
= shrink_dqcache_memory
,
684 .seeks
= DEFAULT_SEEKS
,
688 * Put reference to dquot
689 * NOTE: If you change this function please check whether dqput_blocks() works right...
691 void dqput(struct dquot
*dquot
)
697 #ifdef __DQUOT_PARANOIA
698 if (!atomic_read(&dquot
->dq_count
)) {
699 printk("VFS: dqput: trying to free free dquot\n");
700 printk("VFS: device %s, dquot of %s %d\n",
702 quotatypes
[dquot
->dq_type
],
708 spin_lock(&dq_list_lock
);
710 spin_unlock(&dq_list_lock
);
712 spin_lock(&dq_list_lock
);
713 if (atomic_read(&dquot
->dq_count
) > 1) {
714 /* We have more than one user... nothing to do */
715 atomic_dec(&dquot
->dq_count
);
716 /* Releasing dquot during quotaoff phase? */
717 if (!sb_has_quota_active(dquot
->dq_sb
, dquot
->dq_type
) &&
718 atomic_read(&dquot
->dq_count
) == 1)
719 wake_up(&dquot
->dq_wait_unused
);
720 spin_unlock(&dq_list_lock
);
723 /* Need to release dquot? */
724 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && dquot_dirty(dquot
)) {
725 spin_unlock(&dq_list_lock
);
726 /* Commit dquot before releasing */
727 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
729 printk(KERN_ERR
"VFS: cannot write quota structure on "
730 "device %s (error %d). Quota may get out of "
731 "sync!\n", dquot
->dq_sb
->s_id
, ret
);
733 * We clear dirty bit anyway, so that we avoid
736 spin_lock(&dq_list_lock
);
737 clear_dquot_dirty(dquot
);
738 spin_unlock(&dq_list_lock
);
742 /* Clear flag in case dquot was inactive (something bad happened) */
743 clear_dquot_dirty(dquot
);
744 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
745 spin_unlock(&dq_list_lock
);
746 dquot
->dq_sb
->dq_op
->release_dquot(dquot
);
749 atomic_dec(&dquot
->dq_count
);
750 #ifdef __DQUOT_PARANOIA
752 BUG_ON(!list_empty(&dquot
->dq_free
));
754 put_dquot_last(dquot
);
755 spin_unlock(&dq_list_lock
);
757 EXPORT_SYMBOL(dqput
);
759 struct dquot
*dquot_alloc(struct super_block
*sb
, int type
)
761 return kmem_cache_zalloc(dquot_cachep
, GFP_NOFS
);
763 EXPORT_SYMBOL(dquot_alloc
);
765 static struct dquot
*get_empty_dquot(struct super_block
*sb
, int type
)
769 dquot
= sb
->dq_op
->alloc_dquot(sb
, type
);
773 mutex_init(&dquot
->dq_lock
);
774 INIT_LIST_HEAD(&dquot
->dq_free
);
775 INIT_LIST_HEAD(&dquot
->dq_inuse
);
776 INIT_HLIST_NODE(&dquot
->dq_hash
);
777 INIT_LIST_HEAD(&dquot
->dq_dirty
);
778 init_waitqueue_head(&dquot
->dq_wait_unused
);
780 dquot
->dq_type
= type
;
781 atomic_set(&dquot
->dq_count
, 1);
787 * Get reference to dquot
789 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
790 * destroying our dquot by:
791 * a) checking for quota flags under dq_list_lock and
792 * b) getting a reference to dquot before we release dq_list_lock
794 struct dquot
*dqget(struct super_block
*sb
, unsigned int id
, int type
)
796 unsigned int hashent
= hashfn(sb
, id
, type
);
797 struct dquot
*dquot
= NULL
, *empty
= NULL
;
799 if (!sb_has_quota_active(sb
, type
))
802 spin_lock(&dq_list_lock
);
803 spin_lock(&dq_state_lock
);
804 if (!sb_has_quota_active(sb
, type
)) {
805 spin_unlock(&dq_state_lock
);
806 spin_unlock(&dq_list_lock
);
809 spin_unlock(&dq_state_lock
);
811 dquot
= find_dquot(hashent
, sb
, id
, type
);
814 spin_unlock(&dq_list_lock
);
815 empty
= get_empty_dquot(sb
, type
);
817 schedule(); /* Try to wait for a moment... */
823 /* all dquots go on the inuse_list */
825 /* hash it first so it can be found */
826 insert_dquot_hash(dquot
);
828 spin_unlock(&dq_list_lock
);
830 if (!atomic_read(&dquot
->dq_count
))
831 remove_free_dquot(dquot
);
832 atomic_inc(&dquot
->dq_count
);
833 dqstats
.cache_hits
++;
835 spin_unlock(&dq_list_lock
);
837 /* Wait for dq_lock - after this we know that either dquot_release() is
838 * already finished or it will be canceled due to dq_count > 1 test */
839 wait_on_dquot(dquot
);
840 /* Read the dquot / allocate space in quota file */
841 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) &&
842 sb
->dq_op
->acquire_dquot(dquot
) < 0) {
847 #ifdef __DQUOT_PARANOIA
848 BUG_ON(!dquot
->dq_sb
); /* Has somebody invalidated entry under us? */
852 do_destroy_dquot(empty
);
856 EXPORT_SYMBOL(dqget
);
858 static int dqinit_needed(struct inode
*inode
, int type
)
862 if (IS_NOQUOTA(inode
))
865 return !inode
->i_dquot
[type
];
866 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
867 if (!inode
->i_dquot
[cnt
])
872 /* This routine is guarded by dqonoff_mutex mutex */
873 static void add_dquot_ref(struct super_block
*sb
, int type
)
875 struct inode
*inode
, *old_inode
= NULL
;
878 spin_lock(&inode_lock
);
879 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
880 if (inode
->i_state
& (I_FREEING
|I_CLEAR
|I_WILL_FREE
|I_NEW
))
882 if (unlikely(inode_get_rsv_space(inode
) > 0))
884 if (!atomic_read(&inode
->i_writecount
))
886 if (!dqinit_needed(inode
, type
))
890 spin_unlock(&inode_lock
);
893 sb
->dq_op
->initialize(inode
, type
);
894 /* We hold a reference to 'inode' so it couldn't have been
895 * removed from s_inodes list while we dropped the inode_lock.
896 * We cannot iput the inode now as we can be holding the last
897 * reference and we cannot iput it under inode_lock. So we
898 * keep the reference and iput it later. */
900 spin_lock(&inode_lock
);
902 spin_unlock(&inode_lock
);
906 printk(KERN_WARNING
"VFS (%s): Writes happened before quota"
907 " was turned on thus quota information is probably "
908 "inconsistent. Please run quotacheck(8).\n", sb
->s_id
);
913 * Return 0 if dqput() won't block.
914 * (note that 1 doesn't necessarily mean blocking)
916 static inline int dqput_blocks(struct dquot
*dquot
)
918 if (atomic_read(&dquot
->dq_count
) <= 1)
924 * Remove references to dquots from inode and add dquot to list for freeing
925 * if we have the last referece to dquot
926 * We can't race with anybody because we hold dqptr_sem for writing...
928 static int remove_inode_dquot_ref(struct inode
*inode
, int type
,
929 struct list_head
*tofree_head
)
931 struct dquot
*dquot
= inode
->i_dquot
[type
];
933 inode
->i_dquot
[type
] = NULL
;
935 if (dqput_blocks(dquot
)) {
936 #ifdef __DQUOT_PARANOIA
937 if (atomic_read(&dquot
->dq_count
) != 1)
938 printk(KERN_WARNING
"VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot
->dq_count
));
940 spin_lock(&dq_list_lock
);
941 /* As dquot must have currently users it can't be on
942 * the free list... */
943 list_add(&dquot
->dq_free
, tofree_head
);
944 spin_unlock(&dq_list_lock
);
948 dqput(dquot
); /* We have guaranteed we won't block */
954 * Free list of dquots
955 * Dquots are removed from inodes and no new references can be got so we are
956 * the only ones holding reference
958 static void put_dquot_list(struct list_head
*tofree_head
)
960 struct list_head
*act_head
;
963 act_head
= tofree_head
->next
;
964 while (act_head
!= tofree_head
) {
965 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
966 act_head
= act_head
->next
;
967 /* Remove dquot from the list so we won't have problems... */
968 list_del_init(&dquot
->dq_free
);
973 static void remove_dquot_ref(struct super_block
*sb
, int type
,
974 struct list_head
*tofree_head
)
978 spin_lock(&inode_lock
);
979 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
981 * We have to scan also I_NEW inodes because they can already
982 * have quota pointer initialized. Luckily, we need to touch
983 * only quota pointers and these have separate locking
986 if (!IS_NOQUOTA(inode
))
987 remove_inode_dquot_ref(inode
, type
, tofree_head
);
989 spin_unlock(&inode_lock
);
992 /* Gather all references from inodes and drop them */
993 static void drop_dquot_ref(struct super_block
*sb
, int type
)
995 LIST_HEAD(tofree_head
);
998 down_write(&sb_dqopt(sb
)->dqptr_sem
);
999 remove_dquot_ref(sb
, type
, &tofree_head
);
1000 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1001 put_dquot_list(&tofree_head
);
1005 static inline void dquot_incr_inodes(struct dquot
*dquot
, qsize_t number
)
1007 dquot
->dq_dqb
.dqb_curinodes
+= number
;
1010 static inline void dquot_incr_space(struct dquot
*dquot
, qsize_t number
)
1012 dquot
->dq_dqb
.dqb_curspace
+= number
;
1015 static inline void dquot_resv_space(struct dquot
*dquot
, qsize_t number
)
1017 dquot
->dq_dqb
.dqb_rsvspace
+= number
;
1021 * Claim reserved quota space
1023 static void dquot_claim_reserved_space(struct dquot
*dquot
, qsize_t number
)
1025 if (dquot
->dq_dqb
.dqb_rsvspace
< number
) {
1027 number
= dquot
->dq_dqb
.dqb_rsvspace
;
1029 dquot
->dq_dqb
.dqb_curspace
+= number
;
1030 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1034 void dquot_free_reserved_space(struct dquot
*dquot
, qsize_t number
)
1036 if (dquot
->dq_dqb
.dqb_rsvspace
>= number
)
1037 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
1040 dquot
->dq_dqb
.dqb_rsvspace
= 0;
1044 static void dquot_decr_inodes(struct dquot
*dquot
, qsize_t number
)
1046 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1047 dquot
->dq_dqb
.dqb_curinodes
>= number
)
1048 dquot
->dq_dqb
.dqb_curinodes
-= number
;
1050 dquot
->dq_dqb
.dqb_curinodes
= 0;
1051 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1052 dquot
->dq_dqb
.dqb_itime
= (time_t) 0;
1053 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
1056 static void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
1058 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
1059 dquot
->dq_dqb
.dqb_curspace
>= number
)
1060 dquot
->dq_dqb
.dqb_curspace
-= number
;
1062 dquot
->dq_dqb
.dqb_curspace
= 0;
1063 if (dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1064 dquot
->dq_dqb
.dqb_btime
= (time_t) 0;
1065 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1068 static int warning_issued(struct dquot
*dquot
, const int warntype
)
1070 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
1071 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
1072 ((warntype
== QUOTA_NL_IHARDWARN
||
1073 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
1077 return test_and_set_bit(flag
, &dquot
->dq_flags
);
1080 #ifdef CONFIG_PRINT_QUOTA_WARNING
1081 static int flag_print_warnings
= 1;
1083 static int need_print_warning(struct dquot
*dquot
)
1085 if (!flag_print_warnings
)
1088 switch (dquot
->dq_type
) {
1090 return current_fsuid() == dquot
->dq_id
;
1092 return in_group_p(dquot
->dq_id
);
1097 /* Print warning to user which exceeded quota */
1098 static void print_warning(struct dquot
*dquot
, const int warntype
)
1101 struct tty_struct
*tty
;
1103 if (warntype
== QUOTA_NL_IHARDBELOW
||
1104 warntype
== QUOTA_NL_ISOFTBELOW
||
1105 warntype
== QUOTA_NL_BHARDBELOW
||
1106 warntype
== QUOTA_NL_BSOFTBELOW
|| !need_print_warning(dquot
))
1109 tty
= get_current_tty();
1112 tty_write_message(tty
, dquot
->dq_sb
->s_id
);
1113 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
1114 tty_write_message(tty
, ": warning, ");
1116 tty_write_message(tty
, ": write failed, ");
1117 tty_write_message(tty
, quotatypes
[dquot
->dq_type
]);
1119 case QUOTA_NL_IHARDWARN
:
1120 msg
= " file limit reached.\r\n";
1122 case QUOTA_NL_ISOFTLONGWARN
:
1123 msg
= " file quota exceeded too long.\r\n";
1125 case QUOTA_NL_ISOFTWARN
:
1126 msg
= " file quota exceeded.\r\n";
1128 case QUOTA_NL_BHARDWARN
:
1129 msg
= " block limit reached.\r\n";
1131 case QUOTA_NL_BSOFTLONGWARN
:
1132 msg
= " block quota exceeded too long.\r\n";
1134 case QUOTA_NL_BSOFTWARN
:
1135 msg
= " block quota exceeded.\r\n";
1138 tty_write_message(tty
, msg
);
1144 * Write warnings to the console and send warning messages over netlink.
1146 * Note that this function can sleep.
1148 static void flush_warnings(struct dquot
*const *dquots
, char *warntype
)
1153 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1155 if (dq
&& warntype
[i
] != QUOTA_NL_NOWARN
&&
1156 !warning_issued(dq
, warntype
[i
])) {
1157 #ifdef CONFIG_PRINT_QUOTA_WARNING
1158 print_warning(dq
, warntype
[i
]);
1160 quota_send_warning(dq
->dq_type
, dq
->dq_id
,
1161 dq
->dq_sb
->s_dev
, warntype
[i
]);
1166 static int ignore_hardlimit(struct dquot
*dquot
)
1168 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
1170 return capable(CAP_SYS_RESOURCE
) &&
1171 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
||
1172 !(info
->dqi_flags
& V1_DQF_RSQUASH
));
1175 /* needs dq_data_lock */
1176 static int check_idq(struct dquot
*dquot
, qsize_t inodes
, char *warntype
)
1178 qsize_t newinodes
= dquot
->dq_dqb
.dqb_curinodes
+ inodes
;
1180 *warntype
= QUOTA_NL_NOWARN
;
1181 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
) ||
1182 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1185 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1186 newinodes
> dquot
->dq_dqb
.dqb_ihardlimit
&&
1187 !ignore_hardlimit(dquot
)) {
1188 *warntype
= QUOTA_NL_IHARDWARN
;
1192 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1193 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1194 dquot
->dq_dqb
.dqb_itime
&&
1195 get_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1196 !ignore_hardlimit(dquot
)) {
1197 *warntype
= QUOTA_NL_ISOFTLONGWARN
;
1201 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1202 newinodes
> dquot
->dq_dqb
.dqb_isoftlimit
&&
1203 dquot
->dq_dqb
.dqb_itime
== 0) {
1204 *warntype
= QUOTA_NL_ISOFTWARN
;
1205 dquot
->dq_dqb
.dqb_itime
= get_seconds() +
1206 sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_igrace
;
1212 /* needs dq_data_lock */
1213 static int check_bdq(struct dquot
*dquot
, qsize_t space
, int prealloc
, char *warntype
)
1216 struct super_block
*sb
= dquot
->dq_sb
;
1218 *warntype
= QUOTA_NL_NOWARN
;
1219 if (!sb_has_quota_limits_enabled(sb
, dquot
->dq_type
) ||
1220 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1223 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
1226 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1227 tspace
> dquot
->dq_dqb
.dqb_bhardlimit
&&
1228 !ignore_hardlimit(dquot
)) {
1230 *warntype
= QUOTA_NL_BHARDWARN
;
1234 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1235 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1236 dquot
->dq_dqb
.dqb_btime
&&
1237 get_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1238 !ignore_hardlimit(dquot
)) {
1240 *warntype
= QUOTA_NL_BSOFTLONGWARN
;
1244 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1245 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1246 dquot
->dq_dqb
.dqb_btime
== 0) {
1248 *warntype
= QUOTA_NL_BSOFTWARN
;
1249 dquot
->dq_dqb
.dqb_btime
= get_seconds() +
1250 sb_dqopt(sb
)->info
[dquot
->dq_type
].dqi_bgrace
;
1254 * We don't allow preallocation to exceed softlimit so exceeding will
1263 static int info_idq_free(struct dquot
*dquot
, qsize_t inodes
)
1267 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1268 dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
||
1269 !sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
))
1270 return QUOTA_NL_NOWARN
;
1272 newinodes
= dquot
->dq_dqb
.dqb_curinodes
- inodes
;
1273 if (newinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1274 return QUOTA_NL_ISOFTBELOW
;
1275 if (dquot
->dq_dqb
.dqb_curinodes
>= dquot
->dq_dqb
.dqb_ihardlimit
&&
1276 newinodes
< dquot
->dq_dqb
.dqb_ihardlimit
)
1277 return QUOTA_NL_IHARDBELOW
;
1278 return QUOTA_NL_NOWARN
;
1281 static int info_bdq_free(struct dquot
*dquot
, qsize_t space
)
1283 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1284 dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1285 return QUOTA_NL_NOWARN
;
1287 if (dquot
->dq_dqb
.dqb_curspace
- space
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1288 return QUOTA_NL_BSOFTBELOW
;
1289 if (dquot
->dq_dqb
.dqb_curspace
>= dquot
->dq_dqb
.dqb_bhardlimit
&&
1290 dquot
->dq_dqb
.dqb_curspace
- space
< dquot
->dq_dqb
.dqb_bhardlimit
)
1291 return QUOTA_NL_BHARDBELOW
;
1292 return QUOTA_NL_NOWARN
;
1296 * Initialize quota pointers in inode
1297 * We do things in a bit complicated way but by that we avoid calling
1298 * dqget() and thus filesystem callbacks under dqptr_sem.
1300 int dquot_initialize(struct inode
*inode
, int type
)
1302 unsigned int id
= 0;
1304 struct dquot
*got
[MAXQUOTAS
];
1305 struct super_block
*sb
= inode
->i_sb
;
1308 /* First test before acquiring mutex - solves deadlocks when we
1309 * re-enter the quota code and are already holding the mutex */
1310 if (IS_NOQUOTA(inode
))
1313 /* First get references to structures we might need. */
1314 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1316 if (type
!= -1 && cnt
!= type
)
1326 got
[cnt
] = dqget(sb
, id
, cnt
);
1329 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1330 if (IS_NOQUOTA(inode
))
1332 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1333 if (type
!= -1 && cnt
!= type
)
1335 /* Avoid races with quotaoff() */
1336 if (!sb_has_quota_active(sb
, cnt
))
1338 if (!inode
->i_dquot
[cnt
]) {
1339 inode
->i_dquot
[cnt
] = got
[cnt
];
1342 * Make quota reservation system happy if someone
1343 * did a write before quota was turned on
1345 rsv
= inode_get_rsv_space(inode
);
1347 dquot_resv_space(inode
->i_dquot
[cnt
], rsv
);
1351 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1352 /* Drop unused references */
1356 EXPORT_SYMBOL(dquot_initialize
);
1359 * Release all quotas referenced by inode
1361 int dquot_drop(struct inode
*inode
)
1364 struct dquot
*put
[MAXQUOTAS
];
1366 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1367 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1368 put
[cnt
] = inode
->i_dquot
[cnt
];
1369 inode
->i_dquot
[cnt
] = NULL
;
1371 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1375 EXPORT_SYMBOL(dquot_drop
);
1377 /* Wrapper to remove references to quota structures from inode */
1378 void vfs_dq_drop(struct inode
*inode
)
1380 /* Here we can get arbitrary inode from clear_inode() so we have
1381 * to be careful. OTOH we don't need locking as quota operations
1382 * are allowed to change only at mount time */
1383 if (!IS_NOQUOTA(inode
) && inode
->i_sb
&& inode
->i_sb
->dq_op
1384 && inode
->i_sb
->dq_op
->drop
) {
1386 /* Test before calling to rule out calls from proc and such
1387 * where we are not allowed to block. Note that this is
1388 * actually reliable test even without the lock - the caller
1389 * must assure that nobody can come after the DQUOT_DROP and
1390 * add quota pointers back anyway */
1391 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1392 if (inode
->i_dquot
[cnt
])
1394 if (cnt
< MAXQUOTAS
)
1395 inode
->i_sb
->dq_op
->drop(inode
);
1398 EXPORT_SYMBOL(vfs_dq_drop
);
1401 * inode_reserved_space is managed internally by quota, and protected by
1402 * i_lock similar to i_blocks+i_bytes.
1404 static qsize_t
*inode_reserved_space(struct inode
* inode
)
1406 /* Filesystem must explicitly define it's own method in order to use
1407 * quota reservation interface */
1408 BUG_ON(!inode
->i_sb
->dq_op
->get_reserved_space
);
1409 return inode
->i_sb
->dq_op
->get_reserved_space(inode
);
1412 void inode_add_rsv_space(struct inode
*inode
, qsize_t number
)
1414 spin_lock(&inode
->i_lock
);
1415 *inode_reserved_space(inode
) += number
;
1416 spin_unlock(&inode
->i_lock
);
1418 EXPORT_SYMBOL(inode_add_rsv_space
);
1420 void inode_claim_rsv_space(struct inode
*inode
, qsize_t number
)
1422 spin_lock(&inode
->i_lock
);
1423 *inode_reserved_space(inode
) -= number
;
1424 __inode_add_bytes(inode
, number
);
1425 spin_unlock(&inode
->i_lock
);
1427 EXPORT_SYMBOL(inode_claim_rsv_space
);
1429 void inode_sub_rsv_space(struct inode
*inode
, qsize_t number
)
1431 spin_lock(&inode
->i_lock
);
1432 *inode_reserved_space(inode
) -= number
;
1433 spin_unlock(&inode
->i_lock
);
1435 EXPORT_SYMBOL(inode_sub_rsv_space
);
1437 static qsize_t
inode_get_rsv_space(struct inode
*inode
)
1441 if (!inode
->i_sb
->dq_op
->get_reserved_space
)
1443 spin_lock(&inode
->i_lock
);
1444 ret
= *inode_reserved_space(inode
);
1445 spin_unlock(&inode
->i_lock
);
1449 static void inode_incr_space(struct inode
*inode
, qsize_t number
,
1453 inode_add_rsv_space(inode
, number
);
1455 inode_add_bytes(inode
, number
);
1458 static void inode_decr_space(struct inode
*inode
, qsize_t number
, int reserve
)
1461 inode_sub_rsv_space(inode
, number
);
1463 inode_sub_bytes(inode
, number
);
1467 * Following four functions update i_blocks+i_bytes fields and
1468 * quota information (together with appropriate checks)
1469 * NOTE: We absolutely rely on the fact that caller dirties
1470 * the inode (usually macros in quotaops.h care about this) and
1471 * holds a handle for the current transaction so that dquot write and
1472 * inode write go into the same transaction.
1476 * This operation can block, but only after everything is updated
1478 int __dquot_alloc_space(struct inode
*inode
, qsize_t number
,
1479 int warn
, int reserve
)
1481 int cnt
, ret
= QUOTA_OK
;
1482 char warntype
[MAXQUOTAS
];
1485 * First test before acquiring mutex - solves deadlocks when we
1486 * re-enter the quota code and are already holding the mutex
1488 if (IS_NOQUOTA(inode
)) {
1489 inode_incr_space(inode
, number
, reserve
);
1493 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1494 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1495 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1497 spin_lock(&dq_data_lock
);
1498 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1499 if (!inode
->i_dquot
[cnt
])
1501 if (check_bdq(inode
->i_dquot
[cnt
], number
, warn
, warntype
+cnt
)
1504 spin_unlock(&dq_data_lock
);
1505 goto out_flush_warn
;
1508 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1509 if (!inode
->i_dquot
[cnt
])
1512 dquot_resv_space(inode
->i_dquot
[cnt
], number
);
1514 dquot_incr_space(inode
->i_dquot
[cnt
], number
);
1516 inode_incr_space(inode
, number
, reserve
);
1517 spin_unlock(&dq_data_lock
);
1520 goto out_flush_warn
;
1521 mark_all_dquot_dirty(inode
->i_dquot
);
1523 flush_warnings(inode
->i_dquot
, warntype
);
1524 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1529 int dquot_alloc_space(struct inode
*inode
, qsize_t number
, int warn
)
1531 return __dquot_alloc_space(inode
, number
, warn
, 0);
1533 EXPORT_SYMBOL(dquot_alloc_space
);
1535 int dquot_reserve_space(struct inode
*inode
, qsize_t number
, int warn
)
1537 return __dquot_alloc_space(inode
, number
, warn
, 1);
1539 EXPORT_SYMBOL(dquot_reserve_space
);
1542 * This operation can block, but only after everything is updated
1544 int dquot_alloc_inode(const struct inode
*inode
, qsize_t number
)
1546 int cnt
, ret
= NO_QUOTA
;
1547 char warntype
[MAXQUOTAS
];
1549 /* First test before acquiring mutex - solves deadlocks when we
1550 * re-enter the quota code and are already holding the mutex */
1551 if (IS_NOQUOTA(inode
))
1553 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1554 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1555 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1556 spin_lock(&dq_data_lock
);
1557 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1558 if (!inode
->i_dquot
[cnt
])
1560 if (check_idq(inode
->i_dquot
[cnt
], number
, warntype
+cnt
)
1565 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1566 if (!inode
->i_dquot
[cnt
])
1568 dquot_incr_inodes(inode
->i_dquot
[cnt
], number
);
1572 spin_unlock(&dq_data_lock
);
1573 if (ret
== QUOTA_OK
)
1574 mark_all_dquot_dirty(inode
->i_dquot
);
1575 flush_warnings(inode
->i_dquot
, warntype
);
1576 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1579 EXPORT_SYMBOL(dquot_alloc_inode
);
1581 int dquot_claim_space(struct inode
*inode
, qsize_t number
)
1586 if (IS_NOQUOTA(inode
)) {
1587 inode_claim_rsv_space(inode
, number
);
1591 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1592 spin_lock(&dq_data_lock
);
1593 /* Claim reserved quotas to allocated quotas */
1594 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1595 if (inode
->i_dquot
[cnt
])
1596 dquot_claim_reserved_space(inode
->i_dquot
[cnt
],
1599 /* Update inode bytes */
1600 inode_claim_rsv_space(inode
, number
);
1601 spin_unlock(&dq_data_lock
);
1602 mark_all_dquot_dirty(inode
->i_dquot
);
1603 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1607 EXPORT_SYMBOL(dquot_claim_space
);
1610 * This operation can block, but only after everything is updated
1612 int __dquot_free_space(struct inode
*inode
, qsize_t number
, int reserve
)
1615 char warntype
[MAXQUOTAS
];
1617 /* First test before acquiring mutex - solves deadlocks when we
1618 * re-enter the quota code and are already holding the mutex */
1619 if (IS_NOQUOTA(inode
)) {
1620 inode_decr_space(inode
, number
, reserve
);
1624 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1625 spin_lock(&dq_data_lock
);
1626 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1627 if (!inode
->i_dquot
[cnt
])
1629 warntype
[cnt
] = info_bdq_free(inode
->i_dquot
[cnt
], number
);
1631 dquot_free_reserved_space(inode
->i_dquot
[cnt
], number
);
1633 dquot_decr_space(inode
->i_dquot
[cnt
], number
);
1635 inode_decr_space(inode
, number
, reserve
);
1636 spin_unlock(&dq_data_lock
);
1640 mark_all_dquot_dirty(inode
->i_dquot
);
1642 flush_warnings(inode
->i_dquot
, warntype
);
1643 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1647 int dquot_free_space(struct inode
*inode
, qsize_t number
)
1649 return __dquot_free_space(inode
, number
, 0);
1651 EXPORT_SYMBOL(dquot_free_space
);
1654 * Release reserved quota space
1656 void dquot_release_reserved_space(struct inode
*inode
, qsize_t number
)
1658 __dquot_free_space(inode
, number
, 1);
1661 EXPORT_SYMBOL(dquot_release_reserved_space
);
1664 * This operation can block, but only after everything is updated
1666 int dquot_free_inode(const struct inode
*inode
, qsize_t number
)
1669 char warntype
[MAXQUOTAS
];
1671 /* First test before acquiring mutex - solves deadlocks when we
1672 * re-enter the quota code and are already holding the mutex */
1673 if (IS_NOQUOTA(inode
))
1676 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1677 spin_lock(&dq_data_lock
);
1678 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1679 if (!inode
->i_dquot
[cnt
])
1681 warntype
[cnt
] = info_idq_free(inode
->i_dquot
[cnt
], number
);
1682 dquot_decr_inodes(inode
->i_dquot
[cnt
], number
);
1684 spin_unlock(&dq_data_lock
);
1685 mark_all_dquot_dirty(inode
->i_dquot
);
1686 flush_warnings(inode
->i_dquot
, warntype
);
1687 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1690 EXPORT_SYMBOL(dquot_free_inode
);
1693 * Transfer the number of inode and blocks from one diskquota to an other.
1695 * This operation can block, but only after everything is updated
1696 * A transaction must be started when entering this function.
1698 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
1700 qsize_t space
, cur_space
;
1701 qsize_t rsv_space
= 0;
1702 struct dquot
*transfer_from
[MAXQUOTAS
];
1703 struct dquot
*transfer_to
[MAXQUOTAS
];
1704 int cnt
, ret
= QUOTA_OK
;
1705 int chuid
= iattr
->ia_valid
& ATTR_UID
&& inode
->i_uid
!= iattr
->ia_uid
,
1706 chgid
= iattr
->ia_valid
& ATTR_GID
&& inode
->i_gid
!= iattr
->ia_gid
;
1707 char warntype_to
[MAXQUOTAS
];
1708 char warntype_from_inodes
[MAXQUOTAS
], warntype_from_space
[MAXQUOTAS
];
1710 /* First test before acquiring mutex - solves deadlocks when we
1711 * re-enter the quota code and are already holding the mutex */
1712 if (IS_NOQUOTA(inode
))
1714 /* Initialize the arrays */
1715 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1716 transfer_from
[cnt
] = NULL
;
1717 transfer_to
[cnt
] = NULL
;
1718 warntype_to
[cnt
] = QUOTA_NL_NOWARN
;
1721 transfer_to
[USRQUOTA
] = dqget(inode
->i_sb
, iattr
->ia_uid
,
1724 transfer_to
[GRPQUOTA
] = dqget(inode
->i_sb
, iattr
->ia_gid
,
1727 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1728 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1729 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1732 spin_lock(&dq_data_lock
);
1733 cur_space
= inode_get_bytes(inode
);
1734 rsv_space
= inode_get_rsv_space(inode
);
1735 space
= cur_space
+ rsv_space
;
1736 /* Build the transfer_from list and check the limits */
1737 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1738 if (!transfer_to
[cnt
])
1740 transfer_from
[cnt
] = inode
->i_dquot
[cnt
];
1741 if (check_idq(transfer_to
[cnt
], 1, warntype_to
+ cnt
) ==
1742 NO_QUOTA
|| check_bdq(transfer_to
[cnt
], space
, 0,
1743 warntype_to
+ cnt
) == NO_QUOTA
)
1748 * Finally perform the needed transfer from transfer_from to transfer_to
1750 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1752 * Skip changes for same uid or gid or for turned off quota-type.
1754 if (!transfer_to
[cnt
])
1757 /* Due to IO error we might not have transfer_from[] structure */
1758 if (transfer_from
[cnt
]) {
1759 warntype_from_inodes
[cnt
] =
1760 info_idq_free(transfer_from
[cnt
], 1);
1761 warntype_from_space
[cnt
] =
1762 info_bdq_free(transfer_from
[cnt
], space
);
1763 dquot_decr_inodes(transfer_from
[cnt
], 1);
1764 dquot_decr_space(transfer_from
[cnt
], cur_space
);
1765 dquot_free_reserved_space(transfer_from
[cnt
],
1769 dquot_incr_inodes(transfer_to
[cnt
], 1);
1770 dquot_incr_space(transfer_to
[cnt
], cur_space
);
1771 dquot_resv_space(transfer_to
[cnt
], rsv_space
);
1773 inode
->i_dquot
[cnt
] = transfer_to
[cnt
];
1775 spin_unlock(&dq_data_lock
);
1776 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1778 mark_all_dquot_dirty(transfer_from
);
1779 mark_all_dquot_dirty(transfer_to
);
1780 /* The reference we got is transferred to the inode */
1781 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1782 transfer_to
[cnt
] = NULL
;
1784 flush_warnings(transfer_to
, warntype_to
);
1785 flush_warnings(transfer_from
, warntype_from_inodes
);
1786 flush_warnings(transfer_from
, warntype_from_space
);
1788 dqput_all(transfer_from
);
1789 dqput_all(transfer_to
);
1792 spin_unlock(&dq_data_lock
);
1793 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1794 /* Clear dquot pointers we don't want to dqput() */
1795 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1796 transfer_from
[cnt
] = NULL
;
1800 EXPORT_SYMBOL(dquot_transfer
);
1802 /* Wrapper for transferring ownership of an inode */
1803 int vfs_dq_transfer(struct inode
*inode
, struct iattr
*iattr
)
1805 if (sb_any_quota_active(inode
->i_sb
) && !IS_NOQUOTA(inode
)) {
1807 if (inode
->i_sb
->dq_op
->transfer(inode
, iattr
) == NO_QUOTA
)
1812 EXPORT_SYMBOL(vfs_dq_transfer
);
1815 * Write info of quota file to disk
1817 int dquot_commit_info(struct super_block
*sb
, int type
)
1820 struct quota_info
*dqopt
= sb_dqopt(sb
);
1822 mutex_lock(&dqopt
->dqio_mutex
);
1823 ret
= dqopt
->ops
[type
]->write_file_info(sb
, type
);
1824 mutex_unlock(&dqopt
->dqio_mutex
);
1827 EXPORT_SYMBOL(dquot_commit_info
);
1830 * Definitions of diskquota operations.
1832 const struct dquot_operations dquot_operations
= {
1833 .initialize
= dquot_initialize
,
1835 .alloc_space
= dquot_alloc_space
,
1836 .alloc_inode
= dquot_alloc_inode
,
1837 .free_space
= dquot_free_space
,
1838 .free_inode
= dquot_free_inode
,
1839 .transfer
= dquot_transfer
,
1840 .write_dquot
= dquot_commit
,
1841 .acquire_dquot
= dquot_acquire
,
1842 .release_dquot
= dquot_release
,
1843 .mark_dirty
= dquot_mark_dquot_dirty
,
1844 .write_info
= dquot_commit_info
,
1845 .alloc_dquot
= dquot_alloc
,
1846 .destroy_dquot
= dquot_destroy
,
1850 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1852 int vfs_quota_disable(struct super_block
*sb
, int type
, unsigned int flags
)
1855 struct quota_info
*dqopt
= sb_dqopt(sb
);
1856 struct inode
*toputinode
[MAXQUOTAS
];
1858 /* Cannot turn off usage accounting without turning off limits, or
1859 * suspend quotas and simultaneously turn quotas off. */
1860 if ((flags
& DQUOT_USAGE_ENABLED
&& !(flags
& DQUOT_LIMITS_ENABLED
))
1861 || (flags
& DQUOT_SUSPENDED
&& flags
& (DQUOT_LIMITS_ENABLED
|
1862 DQUOT_USAGE_ENABLED
)))
1865 /* We need to serialize quota_off() for device */
1866 mutex_lock(&dqopt
->dqonoff_mutex
);
1869 * Skip everything if there's nothing to do. We have to do this because
1870 * sometimes we are called when fill_super() failed and calling
1871 * sync_fs() in such cases does no good.
1873 if (!sb_any_quota_loaded(sb
)) {
1874 mutex_unlock(&dqopt
->dqonoff_mutex
);
1877 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1878 toputinode
[cnt
] = NULL
;
1879 if (type
!= -1 && cnt
!= type
)
1881 if (!sb_has_quota_loaded(sb
, cnt
))
1884 if (flags
& DQUOT_SUSPENDED
) {
1885 spin_lock(&dq_state_lock
);
1887 dquot_state_flag(DQUOT_SUSPENDED
, cnt
);
1888 spin_unlock(&dq_state_lock
);
1890 spin_lock(&dq_state_lock
);
1891 dqopt
->flags
&= ~dquot_state_flag(flags
, cnt
);
1892 /* Turning off suspended quotas? */
1893 if (!sb_has_quota_loaded(sb
, cnt
) &&
1894 sb_has_quota_suspended(sb
, cnt
)) {
1895 dqopt
->flags
&= ~dquot_state_flag(
1896 DQUOT_SUSPENDED
, cnt
);
1897 spin_unlock(&dq_state_lock
);
1898 iput(dqopt
->files
[cnt
]);
1899 dqopt
->files
[cnt
] = NULL
;
1902 spin_unlock(&dq_state_lock
);
1905 /* We still have to keep quota loaded? */
1906 if (sb_has_quota_loaded(sb
, cnt
) && !(flags
& DQUOT_SUSPENDED
))
1909 /* Note: these are blocking operations */
1910 drop_dquot_ref(sb
, cnt
);
1911 invalidate_dquots(sb
, cnt
);
1913 * Now all dquots should be invalidated, all writes done so we
1914 * should be only users of the info. No locks needed.
1916 if (info_dirty(&dqopt
->info
[cnt
]))
1917 sb
->dq_op
->write_info(sb
, cnt
);
1918 if (dqopt
->ops
[cnt
]->free_file_info
)
1919 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
1920 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
1922 toputinode
[cnt
] = dqopt
->files
[cnt
];
1923 if (!sb_has_quota_loaded(sb
, cnt
))
1924 dqopt
->files
[cnt
] = NULL
;
1925 dqopt
->info
[cnt
].dqi_flags
= 0;
1926 dqopt
->info
[cnt
].dqi_igrace
= 0;
1927 dqopt
->info
[cnt
].dqi_bgrace
= 0;
1928 dqopt
->ops
[cnt
] = NULL
;
1930 mutex_unlock(&dqopt
->dqonoff_mutex
);
1932 /* Skip syncing and setting flags if quota files are hidden */
1933 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
1936 /* Sync the superblock so that buffers with quota data are written to
1937 * disk (and so userspace sees correct data afterwards). */
1938 if (sb
->s_op
->sync_fs
)
1939 sb
->s_op
->sync_fs(sb
, 1);
1940 sync_blockdev(sb
->s_bdev
);
1941 /* Now the quota files are just ordinary files and we can set the
1942 * inode flags back. Moreover we discard the pagecache so that
1943 * userspace sees the writes we did bypassing the pagecache. We
1944 * must also discard the blockdev buffers so that we see the
1945 * changes done by userspace on the next quotaon() */
1946 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1947 if (toputinode
[cnt
]) {
1948 mutex_lock(&dqopt
->dqonoff_mutex
);
1949 /* If quota was reenabled in the meantime, we have
1951 if (!sb_has_quota_loaded(sb
, cnt
)) {
1952 mutex_lock_nested(&toputinode
[cnt
]->i_mutex
,
1954 toputinode
[cnt
]->i_flags
&= ~(S_IMMUTABLE
|
1955 S_NOATIME
| S_NOQUOTA
);
1956 truncate_inode_pages(&toputinode
[cnt
]->i_data
,
1958 mutex_unlock(&toputinode
[cnt
]->i_mutex
);
1959 mark_inode_dirty(toputinode
[cnt
]);
1961 mutex_unlock(&dqopt
->dqonoff_mutex
);
1964 invalidate_bdev(sb
->s_bdev
);
1966 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1967 if (toputinode
[cnt
]) {
1968 /* On remount RO, we keep the inode pointer so that we
1969 * can reenable quota on the subsequent remount RW. We
1970 * have to check 'flags' variable and not use sb_has_
1971 * function because another quotaon / quotaoff could
1972 * change global state before we got here. We refuse
1973 * to suspend quotas when there is pending delete on
1974 * the quota file... */
1975 if (!(flags
& DQUOT_SUSPENDED
))
1976 iput(toputinode
[cnt
]);
1977 else if (!toputinode
[cnt
]->i_nlink
)
1982 EXPORT_SYMBOL(vfs_quota_disable
);
1984 int vfs_quota_off(struct super_block
*sb
, int type
, int remount
)
1986 return vfs_quota_disable(sb
, type
, remount
? DQUOT_SUSPENDED
:
1987 (DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
));
1989 EXPORT_SYMBOL(vfs_quota_off
);
1991 * Turn quotas on on a device
1995 * Helper function to turn quotas on when we already have the inode of
1996 * quota file and no quota information is loaded.
1998 static int vfs_load_quota_inode(struct inode
*inode
, int type
, int format_id
,
2001 struct quota_format_type
*fmt
= find_quota_format(format_id
);
2002 struct super_block
*sb
= inode
->i_sb
;
2003 struct quota_info
*dqopt
= sb_dqopt(sb
);
2009 if (!S_ISREG(inode
->i_mode
)) {
2013 if (IS_RDONLY(inode
)) {
2017 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
) {
2021 /* Usage always has to be set... */
2022 if (!(flags
& DQUOT_USAGE_ENABLED
)) {
2027 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2028 /* As we bypass the pagecache we must now flush the inode so
2029 * that we see all the changes from userspace... */
2030 write_inode_now(inode
, 1);
2031 /* And now flush the block cache so that kernel sees the
2033 invalidate_bdev(sb
->s_bdev
);
2035 mutex_lock(&dqopt
->dqonoff_mutex
);
2036 if (sb_has_quota_loaded(sb
, type
)) {
2041 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2042 /* We don't want quota and atime on quota files (deadlocks
2043 * possible) Also nobody should write to the file - we use
2044 * special IO operations which ignore the immutable bit. */
2045 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
2046 oldflags
= inode
->i_flags
& (S_NOATIME
| S_IMMUTABLE
|
2048 inode
->i_flags
|= S_NOQUOTA
| S_NOATIME
| S_IMMUTABLE
;
2049 mutex_unlock(&inode
->i_mutex
);
2051 * When S_NOQUOTA is set, remove dquot references as no more
2052 * references can be added
2054 sb
->dq_op
->drop(inode
);
2058 dqopt
->files
[type
] = igrab(inode
);
2059 if (!dqopt
->files
[type
])
2062 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
2065 dqopt
->ops
[type
] = fmt
->qf_ops
;
2066 dqopt
->info
[type
].dqi_format
= fmt
;
2067 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
2068 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
2069 mutex_lock(&dqopt
->dqio_mutex
);
2070 error
= dqopt
->ops
[type
]->read_file_info(sb
, type
);
2072 mutex_unlock(&dqopt
->dqio_mutex
);
2075 mutex_unlock(&dqopt
->dqio_mutex
);
2076 spin_lock(&dq_state_lock
);
2077 dqopt
->flags
|= dquot_state_flag(flags
, type
);
2078 spin_unlock(&dq_state_lock
);
2080 add_dquot_ref(sb
, type
);
2081 mutex_unlock(&dqopt
->dqonoff_mutex
);
2086 dqopt
->files
[type
] = NULL
;
2089 if (oldflags
!= -1) {
2090 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
2091 /* Set the flags back (in the case of accidental quotaon()
2092 * on a wrong file we don't want to mess up the flags) */
2093 inode
->i_flags
&= ~(S_NOATIME
| S_NOQUOTA
| S_IMMUTABLE
);
2094 inode
->i_flags
|= oldflags
;
2095 mutex_unlock(&inode
->i_mutex
);
2097 mutex_unlock(&dqopt
->dqonoff_mutex
);
2099 put_quota_format(fmt
);
2104 /* Reenable quotas on remount RW */
2105 static int vfs_quota_on_remount(struct super_block
*sb
, int type
)
2107 struct quota_info
*dqopt
= sb_dqopt(sb
);
2108 struct inode
*inode
;
2112 mutex_lock(&dqopt
->dqonoff_mutex
);
2113 if (!sb_has_quota_suspended(sb
, type
)) {
2114 mutex_unlock(&dqopt
->dqonoff_mutex
);
2117 inode
= dqopt
->files
[type
];
2118 dqopt
->files
[type
] = NULL
;
2119 spin_lock(&dq_state_lock
);
2120 flags
= dqopt
->flags
& dquot_state_flag(DQUOT_USAGE_ENABLED
|
2121 DQUOT_LIMITS_ENABLED
, type
);
2122 dqopt
->flags
&= ~dquot_state_flag(DQUOT_STATE_FLAGS
, type
);
2123 spin_unlock(&dq_state_lock
);
2124 mutex_unlock(&dqopt
->dqonoff_mutex
);
2126 flags
= dquot_generic_flag(flags
, type
);
2127 ret
= vfs_load_quota_inode(inode
, type
, dqopt
->info
[type
].dqi_fmt_id
,
2134 int vfs_quota_on_path(struct super_block
*sb
, int type
, int format_id
,
2137 int error
= security_quota_on(path
->dentry
);
2140 /* Quota file not on the same filesystem? */
2141 if (path
->mnt
->mnt_sb
!= sb
)
2144 error
= vfs_load_quota_inode(path
->dentry
->d_inode
, type
,
2145 format_id
, DQUOT_USAGE_ENABLED
|
2146 DQUOT_LIMITS_ENABLED
);
2149 EXPORT_SYMBOL(vfs_quota_on_path
);
2151 int vfs_quota_on(struct super_block
*sb
, int type
, int format_id
, char *name
,
2158 return vfs_quota_on_remount(sb
, type
);
2160 error
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
2162 error
= vfs_quota_on_path(sb
, type
, format_id
, &path
);
2167 EXPORT_SYMBOL(vfs_quota_on
);
2170 * More powerful function for turning on quotas allowing setting
2171 * of individual quota flags
2173 int vfs_quota_enable(struct inode
*inode
, int type
, int format_id
,
2177 struct super_block
*sb
= inode
->i_sb
;
2178 struct quota_info
*dqopt
= sb_dqopt(sb
);
2180 /* Just unsuspend quotas? */
2181 if (flags
& DQUOT_SUSPENDED
)
2182 return vfs_quota_on_remount(sb
, type
);
2185 /* Just updating flags needed? */
2186 if (sb_has_quota_loaded(sb
, type
)) {
2187 mutex_lock(&dqopt
->dqonoff_mutex
);
2188 /* Now do a reliable test... */
2189 if (!sb_has_quota_loaded(sb
, type
)) {
2190 mutex_unlock(&dqopt
->dqonoff_mutex
);
2193 if (flags
& DQUOT_USAGE_ENABLED
&&
2194 sb_has_quota_usage_enabled(sb
, type
)) {
2198 if (flags
& DQUOT_LIMITS_ENABLED
&&
2199 sb_has_quota_limits_enabled(sb
, type
)) {
2203 spin_lock(&dq_state_lock
);
2204 sb_dqopt(sb
)->flags
|= dquot_state_flag(flags
, type
);
2205 spin_unlock(&dq_state_lock
);
2207 mutex_unlock(&dqopt
->dqonoff_mutex
);
2212 return vfs_load_quota_inode(inode
, type
, format_id
, flags
);
2214 EXPORT_SYMBOL(vfs_quota_enable
);
2217 * This function is used when filesystem needs to initialize quotas
2218 * during mount time.
2220 int vfs_quota_on_mount(struct super_block
*sb
, char *qf_name
,
2221 int format_id
, int type
)
2223 struct dentry
*dentry
;
2226 mutex_lock(&sb
->s_root
->d_inode
->i_mutex
);
2227 dentry
= lookup_one_len(qf_name
, sb
->s_root
, strlen(qf_name
));
2228 mutex_unlock(&sb
->s_root
->d_inode
->i_mutex
);
2230 return PTR_ERR(dentry
);
2232 if (!dentry
->d_inode
) {
2237 error
= security_quota_on(dentry
);
2239 error
= vfs_load_quota_inode(dentry
->d_inode
, type
, format_id
,
2240 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2246 EXPORT_SYMBOL(vfs_quota_on_mount
);
2248 /* Wrapper to turn on quotas when remounting rw */
2249 int vfs_dq_quota_on_remount(struct super_block
*sb
)
2254 if (!sb
->s_qcop
|| !sb
->s_qcop
->quota_on
)
2256 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2257 err
= sb
->s_qcop
->quota_on(sb
, cnt
, 0, NULL
, 1);
2258 if (err
< 0 && !ret
)
2263 EXPORT_SYMBOL(vfs_dq_quota_on_remount
);
2265 static inline qsize_t
qbtos(qsize_t blocks
)
2267 return blocks
<< QIF_DQBLKSIZE_BITS
;
2270 static inline qsize_t
stoqb(qsize_t space
)
2272 return (space
+ QIF_DQBLKSIZE
- 1) >> QIF_DQBLKSIZE_BITS
;
2275 /* Generic routine for getting common part of quota structure */
2276 static void do_get_dqblk(struct dquot
*dquot
, struct if_dqblk
*di
)
2278 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2280 spin_lock(&dq_data_lock
);
2281 di
->dqb_bhardlimit
= stoqb(dm
->dqb_bhardlimit
);
2282 di
->dqb_bsoftlimit
= stoqb(dm
->dqb_bsoftlimit
);
2283 di
->dqb_curspace
= dm
->dqb_curspace
+ dm
->dqb_rsvspace
;
2284 di
->dqb_ihardlimit
= dm
->dqb_ihardlimit
;
2285 di
->dqb_isoftlimit
= dm
->dqb_isoftlimit
;
2286 di
->dqb_curinodes
= dm
->dqb_curinodes
;
2287 di
->dqb_btime
= dm
->dqb_btime
;
2288 di
->dqb_itime
= dm
->dqb_itime
;
2289 di
->dqb_valid
= QIF_ALL
;
2290 spin_unlock(&dq_data_lock
);
2293 int vfs_get_dqblk(struct super_block
*sb
, int type
, qid_t id
,
2294 struct if_dqblk
*di
)
2296 struct dquot
*dquot
;
2298 dquot
= dqget(sb
, id
, type
);
2301 do_get_dqblk(dquot
, di
);
2306 EXPORT_SYMBOL(vfs_get_dqblk
);
2308 /* Generic routine for setting common part of quota structure */
2309 static int do_set_dqblk(struct dquot
*dquot
, struct if_dqblk
*di
)
2311 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2312 int check_blim
= 0, check_ilim
= 0;
2313 struct mem_dqinfo
*dqi
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
2315 if ((di
->dqb_valid
& QIF_BLIMITS
&&
2316 (di
->dqb_bhardlimit
> dqi
->dqi_maxblimit
||
2317 di
->dqb_bsoftlimit
> dqi
->dqi_maxblimit
)) ||
2318 (di
->dqb_valid
& QIF_ILIMITS
&&
2319 (di
->dqb_ihardlimit
> dqi
->dqi_maxilimit
||
2320 di
->dqb_isoftlimit
> dqi
->dqi_maxilimit
)))
2323 spin_lock(&dq_data_lock
);
2324 if (di
->dqb_valid
& QIF_SPACE
) {
2325 dm
->dqb_curspace
= di
->dqb_curspace
- dm
->dqb_rsvspace
;
2327 __set_bit(DQ_LASTSET_B
+ QIF_SPACE_B
, &dquot
->dq_flags
);
2329 if (di
->dqb_valid
& QIF_BLIMITS
) {
2330 dm
->dqb_bsoftlimit
= qbtos(di
->dqb_bsoftlimit
);
2331 dm
->dqb_bhardlimit
= qbtos(di
->dqb_bhardlimit
);
2333 __set_bit(DQ_LASTSET_B
+ QIF_BLIMITS_B
, &dquot
->dq_flags
);
2335 if (di
->dqb_valid
& QIF_INODES
) {
2336 dm
->dqb_curinodes
= di
->dqb_curinodes
;
2338 __set_bit(DQ_LASTSET_B
+ QIF_INODES_B
, &dquot
->dq_flags
);
2340 if (di
->dqb_valid
& QIF_ILIMITS
) {
2341 dm
->dqb_isoftlimit
= di
->dqb_isoftlimit
;
2342 dm
->dqb_ihardlimit
= di
->dqb_ihardlimit
;
2344 __set_bit(DQ_LASTSET_B
+ QIF_ILIMITS_B
, &dquot
->dq_flags
);
2346 if (di
->dqb_valid
& QIF_BTIME
) {
2347 dm
->dqb_btime
= di
->dqb_btime
;
2349 __set_bit(DQ_LASTSET_B
+ QIF_BTIME_B
, &dquot
->dq_flags
);
2351 if (di
->dqb_valid
& QIF_ITIME
) {
2352 dm
->dqb_itime
= di
->dqb_itime
;
2354 __set_bit(DQ_LASTSET_B
+ QIF_ITIME_B
, &dquot
->dq_flags
);
2358 if (!dm
->dqb_bsoftlimit
||
2359 dm
->dqb_curspace
< dm
->dqb_bsoftlimit
) {
2361 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
2362 } else if (!(di
->dqb_valid
& QIF_BTIME
))
2363 /* Set grace only if user hasn't provided his own... */
2364 dm
->dqb_btime
= get_seconds() + dqi
->dqi_bgrace
;
2367 if (!dm
->dqb_isoftlimit
||
2368 dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
2370 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
2371 } else if (!(di
->dqb_valid
& QIF_ITIME
))
2372 /* Set grace only if user hasn't provided his own... */
2373 dm
->dqb_itime
= get_seconds() + dqi
->dqi_igrace
;
2375 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
||
2377 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2379 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2380 spin_unlock(&dq_data_lock
);
2381 mark_dquot_dirty(dquot
);
2386 int vfs_set_dqblk(struct super_block
*sb
, int type
, qid_t id
,
2387 struct if_dqblk
*di
)
2389 struct dquot
*dquot
;
2392 dquot
= dqget(sb
, id
, type
);
2397 rc
= do_set_dqblk(dquot
, di
);
2402 EXPORT_SYMBOL(vfs_set_dqblk
);
2404 /* Generic routine for getting common part of quota file information */
2405 int vfs_get_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2407 struct mem_dqinfo
*mi
;
2409 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2410 if (!sb_has_quota_active(sb
, type
)) {
2411 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2414 mi
= sb_dqopt(sb
)->info
+ type
;
2415 spin_lock(&dq_data_lock
);
2416 ii
->dqi_bgrace
= mi
->dqi_bgrace
;
2417 ii
->dqi_igrace
= mi
->dqi_igrace
;
2418 ii
->dqi_flags
= mi
->dqi_flags
& DQF_MASK
;
2419 ii
->dqi_valid
= IIF_ALL
;
2420 spin_unlock(&dq_data_lock
);
2421 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2424 EXPORT_SYMBOL(vfs_get_dqinfo
);
2426 /* Generic routine for setting common part of quota file information */
2427 int vfs_set_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2429 struct mem_dqinfo
*mi
;
2432 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2433 if (!sb_has_quota_active(sb
, type
)) {
2437 mi
= sb_dqopt(sb
)->info
+ type
;
2438 spin_lock(&dq_data_lock
);
2439 if (ii
->dqi_valid
& IIF_BGRACE
)
2440 mi
->dqi_bgrace
= ii
->dqi_bgrace
;
2441 if (ii
->dqi_valid
& IIF_IGRACE
)
2442 mi
->dqi_igrace
= ii
->dqi_igrace
;
2443 if (ii
->dqi_valid
& IIF_FLAGS
)
2444 mi
->dqi_flags
= (mi
->dqi_flags
& ~DQF_MASK
) |
2445 (ii
->dqi_flags
& DQF_MASK
);
2446 spin_unlock(&dq_data_lock
);
2447 mark_info_dirty(sb
, type
);
2448 /* Force write to disk */
2449 sb
->dq_op
->write_info(sb
, type
);
2451 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2454 EXPORT_SYMBOL(vfs_set_dqinfo
);
2456 const struct quotactl_ops vfs_quotactl_ops
= {
2457 .quota_on
= vfs_quota_on
,
2458 .quota_off
= vfs_quota_off
,
2459 .quota_sync
= vfs_quota_sync
,
2460 .get_info
= vfs_get_dqinfo
,
2461 .set_info
= vfs_set_dqinfo
,
2462 .get_dqblk
= vfs_get_dqblk
,
2463 .set_dqblk
= vfs_set_dqblk
2466 static ctl_table fs_dqstats_table
[] = {
2468 .procname
= "lookups",
2469 .data
= &dqstats
.lookups
,
2470 .maxlen
= sizeof(int),
2472 .proc_handler
= proc_dointvec
,
2475 .procname
= "drops",
2476 .data
= &dqstats
.drops
,
2477 .maxlen
= sizeof(int),
2479 .proc_handler
= proc_dointvec
,
2482 .procname
= "reads",
2483 .data
= &dqstats
.reads
,
2484 .maxlen
= sizeof(int),
2486 .proc_handler
= proc_dointvec
,
2489 .procname
= "writes",
2490 .data
= &dqstats
.writes
,
2491 .maxlen
= sizeof(int),
2493 .proc_handler
= proc_dointvec
,
2496 .procname
= "cache_hits",
2497 .data
= &dqstats
.cache_hits
,
2498 .maxlen
= sizeof(int),
2500 .proc_handler
= proc_dointvec
,
2503 .procname
= "allocated_dquots",
2504 .data
= &dqstats
.allocated_dquots
,
2505 .maxlen
= sizeof(int),
2507 .proc_handler
= proc_dointvec
,
2510 .procname
= "free_dquots",
2511 .data
= &dqstats
.free_dquots
,
2512 .maxlen
= sizeof(int),
2514 .proc_handler
= proc_dointvec
,
2517 .procname
= "syncs",
2518 .data
= &dqstats
.syncs
,
2519 .maxlen
= sizeof(int),
2521 .proc_handler
= proc_dointvec
,
2523 #ifdef CONFIG_PRINT_QUOTA_WARNING
2525 .procname
= "warnings",
2526 .data
= &flag_print_warnings
,
2527 .maxlen
= sizeof(int),
2529 .proc_handler
= proc_dointvec
,
2535 static ctl_table fs_table
[] = {
2537 .procname
= "quota",
2539 .child
= fs_dqstats_table
,
2544 static ctl_table sys_table
[] = {
2553 static int __init
dquot_init(void)
2556 unsigned long nr_hash
, order
;
2558 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2560 register_sysctl_table(sys_table
);
2562 dquot_cachep
= kmem_cache_create("dquot",
2563 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2564 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2565 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2569 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
2571 panic("Cannot create dquot hash table");
2573 /* Find power-of-two hlist_heads which can fit into allocation */
2574 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2578 } while (nr_hash
>> dq_hash_bits
);
2581 nr_hash
= 1UL << dq_hash_bits
;
2582 dq_hash_mask
= nr_hash
- 1;
2583 for (i
= 0; i
< nr_hash
; i
++)
2584 INIT_HLIST_HEAD(dquot_hash
+ i
);
2586 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2587 nr_hash
, order
, (PAGE_SIZE
<< order
));
2589 register_shrinker(&dqcache_shrinker
);
2593 module_init(dquot_init
);