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.. */
80 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
81 #include <net/netlink.h>
82 #include <net/genetlink.h>
85 #include <asm/uaccess.h>
87 #define __DQUOT_PARANOIA
90 * There are three quota SMP locks. dq_list_lock protects all lists with quotas
91 * and quota formats, dqstats structure containing statistics about the lists
92 * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
93 * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
94 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
95 * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
96 * modifications of quota state (on quotaon and quotaoff) and readers who care
97 * about latest values take it as well.
99 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
100 * dq_list_lock > dq_state_lock
102 * Note that some things (eg. sb pointer, type, id) doesn't change during
103 * the life of the dquot structure and so needn't to be protected by a lock
105 * Any operation working on dquots via inode pointers must hold dqptr_sem. If
106 * operation is just reading pointers from inode (or not using them at all) the
107 * read lock is enough. If pointers are altered function must hold write lock
108 * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
109 * for altering the flag i_mutex is also needed).
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 DEFINE_SPINLOCK(dq_list_lock
);
133 static DEFINE_SPINLOCK(dq_state_lock
);
134 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
; actqf
= &(*actqf
)->qf_next
);
161 *actqf
= (*actqf
)->qf_next
;
162 spin_unlock(&dq_list_lock
);
164 EXPORT_SYMBOL(unregister_quota_format
);
166 static struct quota_format_type
*find_quota_format(int id
)
168 struct quota_format_type
*actqf
;
170 spin_lock(&dq_list_lock
);
171 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
; 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
&& module_names
[qm
].qm_fmt_id
!= id
; qm
++);
178 if (!module_names
[qm
].qm_fmt_id
|| request_module(module_names
[qm
].qm_mod_name
))
181 spin_lock(&dq_list_lock
);
182 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
; actqf
= actqf
->qf_next
);
183 if (actqf
&& !try_module_get(actqf
->qf_owner
))
186 spin_unlock(&dq_list_lock
);
190 static void put_quota_format(struct quota_format_type
*fmt
)
192 module_put(fmt
->qf_owner
);
196 * Dquot List Management:
197 * The quota code uses three lists for dquot management: the inuse_list,
198 * free_dquots, and dquot_hash[] array. A single dquot structure may be
199 * on all three lists, depending on its current state.
201 * All dquots are placed to the end of inuse_list when first created, and this
202 * list is used for invalidate operation, which must look at every dquot.
204 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
205 * and this list is searched whenever we need an available dquot. Dquots are
206 * removed from the list as soon as they are used again, and
207 * dqstats.free_dquots gives the number of dquots on the list. When
208 * dquot is invalidated it's completely released from memory.
210 * Dquots with a specific identity (device, type and id) are placed on
211 * one of the dquot_hash[] hash chains. The provides an efficient search
212 * mechanism to locate a specific dquot.
215 static LIST_HEAD(inuse_list
);
216 static LIST_HEAD(free_dquots
);
217 static unsigned int dq_hash_bits
, dq_hash_mask
;
218 static struct hlist_head
*dquot_hash
;
220 struct dqstats dqstats
;
221 EXPORT_SYMBOL(dqstats
);
223 static inline unsigned int
224 hashfn(const struct super_block
*sb
, unsigned int id
, int type
)
228 tmp
= (((unsigned long)sb
>>L1_CACHE_SHIFT
) ^ id
) * (MAXQUOTAS
- type
);
229 return (tmp
+ (tmp
>> dq_hash_bits
)) & dq_hash_mask
;
233 * Following list functions expect dq_list_lock to be held
235 static inline void insert_dquot_hash(struct dquot
*dquot
)
237 struct hlist_head
*head
= dquot_hash
+ hashfn(dquot
->dq_sb
, dquot
->dq_id
, dquot
->dq_type
);
238 hlist_add_head(&dquot
->dq_hash
, head
);
241 static inline void remove_dquot_hash(struct dquot
*dquot
)
243 hlist_del_init(&dquot
->dq_hash
);
246 static inline struct dquot
*find_dquot(unsigned int hashent
, struct super_block
*sb
, unsigned int id
, int type
)
248 struct hlist_node
*node
;
251 hlist_for_each (node
, dquot_hash
+hashent
) {
252 dquot
= hlist_entry(node
, struct dquot
, dq_hash
);
253 if (dquot
->dq_sb
== sb
&& dquot
->dq_id
== id
&& dquot
->dq_type
== type
)
259 /* Add a dquot to the tail of the free list */
260 static inline void put_dquot_last(struct dquot
*dquot
)
262 list_add_tail(&dquot
->dq_free
, &free_dquots
);
263 dqstats
.free_dquots
++;
266 static inline void remove_free_dquot(struct dquot
*dquot
)
268 if (list_empty(&dquot
->dq_free
))
270 list_del_init(&dquot
->dq_free
);
271 dqstats
.free_dquots
--;
274 static inline void put_inuse(struct dquot
*dquot
)
276 /* We add to the back of inuse list so we don't have to restart
277 * when traversing this list and we block */
278 list_add_tail(&dquot
->dq_inuse
, &inuse_list
);
279 dqstats
.allocated_dquots
++;
282 static inline void remove_inuse(struct dquot
*dquot
)
284 dqstats
.allocated_dquots
--;
285 list_del(&dquot
->dq_inuse
);
288 * End of list functions needing dq_list_lock
291 static void wait_on_dquot(struct dquot
*dquot
)
293 mutex_lock(&dquot
->dq_lock
);
294 mutex_unlock(&dquot
->dq_lock
);
297 static inline int dquot_dirty(struct dquot
*dquot
)
299 return test_bit(DQ_MOD_B
, &dquot
->dq_flags
);
302 static inline int mark_dquot_dirty(struct dquot
*dquot
)
304 return dquot
->dq_sb
->dq_op
->mark_dirty(dquot
);
307 int dquot_mark_dquot_dirty(struct dquot
*dquot
)
309 spin_lock(&dq_list_lock
);
310 if (!test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
))
311 list_add(&dquot
->dq_dirty
, &sb_dqopt(dquot
->dq_sb
)->
312 info
[dquot
->dq_type
].dqi_dirty_list
);
313 spin_unlock(&dq_list_lock
);
316 EXPORT_SYMBOL(dquot_mark_dquot_dirty
);
318 /* This function needs dq_list_lock */
319 static inline int clear_dquot_dirty(struct dquot
*dquot
)
321 if (!test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
))
323 list_del_init(&dquot
->dq_dirty
);
327 void mark_info_dirty(struct super_block
*sb
, int type
)
329 set_bit(DQF_INFO_DIRTY_B
, &sb_dqopt(sb
)->info
[type
].dqi_flags
);
331 EXPORT_SYMBOL(mark_info_dirty
);
334 * Read dquot from disk and alloc space for it
337 int dquot_acquire(struct dquot
*dquot
)
339 int ret
= 0, ret2
= 0;
340 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
342 mutex_lock(&dquot
->dq_lock
);
343 mutex_lock(&dqopt
->dqio_mutex
);
344 if (!test_bit(DQ_READ_B
, &dquot
->dq_flags
))
345 ret
= dqopt
->ops
[dquot
->dq_type
]->read_dqblk(dquot
);
348 set_bit(DQ_READ_B
, &dquot
->dq_flags
);
349 /* Instantiate dquot if needed */
350 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && !dquot
->dq_off
) {
351 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
352 /* Write the info if needed */
353 if (info_dirty(&dqopt
->info
[dquot
->dq_type
]))
354 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(dquot
->dq_sb
, dquot
->dq_type
);
362 set_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
364 mutex_unlock(&dqopt
->dqio_mutex
);
365 mutex_unlock(&dquot
->dq_lock
);
368 EXPORT_SYMBOL(dquot_acquire
);
371 * Write dquot to disk
373 int dquot_commit(struct dquot
*dquot
)
375 int ret
= 0, ret2
= 0;
376 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
378 mutex_lock(&dqopt
->dqio_mutex
);
379 spin_lock(&dq_list_lock
);
380 if (!clear_dquot_dirty(dquot
)) {
381 spin_unlock(&dq_list_lock
);
384 spin_unlock(&dq_list_lock
);
385 /* Inactive dquot can be only if there was error during read/init
386 * => we have better not writing it */
387 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
388 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
389 if (info_dirty(&dqopt
->info
[dquot
->dq_type
]))
390 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(dquot
->dq_sb
, dquot
->dq_type
);
395 mutex_unlock(&dqopt
->dqio_mutex
);
398 EXPORT_SYMBOL(dquot_commit
);
403 int dquot_release(struct dquot
*dquot
)
405 int ret
= 0, ret2
= 0;
406 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
408 mutex_lock(&dquot
->dq_lock
);
409 /* Check whether we are not racing with some other dqget() */
410 if (atomic_read(&dquot
->dq_count
) > 1)
412 mutex_lock(&dqopt
->dqio_mutex
);
413 if (dqopt
->ops
[dquot
->dq_type
]->release_dqblk
) {
414 ret
= dqopt
->ops
[dquot
->dq_type
]->release_dqblk(dquot
);
416 if (info_dirty(&dqopt
->info
[dquot
->dq_type
]))
417 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(dquot
->dq_sb
, dquot
->dq_type
);
421 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
422 mutex_unlock(&dqopt
->dqio_mutex
);
424 mutex_unlock(&dquot
->dq_lock
);
427 EXPORT_SYMBOL(dquot_release
);
429 void dquot_destroy(struct dquot
*dquot
)
431 kmem_cache_free(dquot_cachep
, dquot
);
433 EXPORT_SYMBOL(dquot_destroy
);
435 static inline void do_destroy_dquot(struct dquot
*dquot
)
437 dquot
->dq_sb
->dq_op
->destroy_dquot(dquot
);
440 /* Invalidate all dquots on the list. Note that this function is called after
441 * quota is disabled and pointers from inodes removed so there cannot be new
442 * quota users. There can still be some users of quotas due to inodes being
443 * just deleted or pruned by prune_icache() (those are not attached to any
444 * list) or parallel quotactl call. We have to wait for such users.
446 static void invalidate_dquots(struct super_block
*sb
, int type
)
448 struct dquot
*dquot
, *tmp
;
451 spin_lock(&dq_list_lock
);
452 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
453 if (dquot
->dq_sb
!= sb
)
455 if (dquot
->dq_type
!= type
)
457 /* Wait for dquot users */
458 if (atomic_read(&dquot
->dq_count
)) {
461 atomic_inc(&dquot
->dq_count
);
462 prepare_to_wait(&dquot
->dq_wait_unused
, &wait
,
463 TASK_UNINTERRUPTIBLE
);
464 spin_unlock(&dq_list_lock
);
465 /* Once dqput() wakes us up, we know it's time to free
467 * IMPORTANT: we rely on the fact that there is always
468 * at most one process waiting for dquot to free.
469 * Otherwise dq_count would be > 1 and we would never
472 if (atomic_read(&dquot
->dq_count
) > 1)
474 finish_wait(&dquot
->dq_wait_unused
, &wait
);
476 /* At this moment dquot() need not exist (it could be
477 * reclaimed by prune_dqcache(). Hence we must
482 * Quota now has no users and it has been written on last
485 remove_dquot_hash(dquot
);
486 remove_free_dquot(dquot
);
488 do_destroy_dquot(dquot
);
490 spin_unlock(&dq_list_lock
);
493 /* Call callback for every active dquot on given filesystem */
494 int dquot_scan_active(struct super_block
*sb
,
495 int (*fn
)(struct dquot
*dquot
, unsigned long priv
),
498 struct dquot
*dquot
, *old_dquot
= NULL
;
501 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
502 spin_lock(&dq_list_lock
);
503 list_for_each_entry(dquot
, &inuse_list
, dq_inuse
) {
504 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
506 if (dquot
->dq_sb
!= sb
)
508 /* Now we have active dquot so we can just increase use count */
509 atomic_inc(&dquot
->dq_count
);
511 spin_unlock(&dq_list_lock
);
514 ret
= fn(dquot
, priv
);
517 spin_lock(&dq_list_lock
);
518 /* We are safe to continue now because our dquot could not
519 * be moved out of the inuse list while we hold the reference */
521 spin_unlock(&dq_list_lock
);
524 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
527 EXPORT_SYMBOL(dquot_scan_active
);
529 int vfs_quota_sync(struct super_block
*sb
, int type
)
531 struct list_head
*dirty
;
533 struct quota_info
*dqopt
= sb_dqopt(sb
);
536 mutex_lock(&dqopt
->dqonoff_mutex
);
537 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
538 if (type
!= -1 && cnt
!= type
)
540 if (!sb_has_quota_active(sb
, cnt
))
542 spin_lock(&dq_list_lock
);
543 dirty
= &dqopt
->info
[cnt
].dqi_dirty_list
;
544 while (!list_empty(dirty
)) {
545 dquot
= list_first_entry(dirty
, struct dquot
, dq_dirty
);
546 /* Dirty and inactive can be only bad dquot... */
547 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
548 clear_dquot_dirty(dquot
);
551 /* Now we have active dquot from which someone is
552 * holding reference so we can safely just increase
554 atomic_inc(&dquot
->dq_count
);
556 spin_unlock(&dq_list_lock
);
557 sb
->dq_op
->write_dquot(dquot
);
559 spin_lock(&dq_list_lock
);
561 spin_unlock(&dq_list_lock
);
564 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
565 if ((cnt
== type
|| type
== -1) && sb_has_quota_active(sb
, cnt
)
566 && info_dirty(&dqopt
->info
[cnt
]))
567 sb
->dq_op
->write_info(sb
, cnt
);
568 spin_lock(&dq_list_lock
);
570 spin_unlock(&dq_list_lock
);
571 mutex_unlock(&dqopt
->dqonoff_mutex
);
575 EXPORT_SYMBOL(vfs_quota_sync
);
577 /* Free unused dquots from cache */
578 static void prune_dqcache(int count
)
580 struct list_head
*head
;
583 head
= free_dquots
.prev
;
584 while (head
!= &free_dquots
&& count
) {
585 dquot
= list_entry(head
, struct dquot
, dq_free
);
586 remove_dquot_hash(dquot
);
587 remove_free_dquot(dquot
);
589 do_destroy_dquot(dquot
);
591 head
= free_dquots
.prev
;
596 * This is called from kswapd when we think we need some
600 static int shrink_dqcache_memory(int nr
, gfp_t gfp_mask
)
603 spin_lock(&dq_list_lock
);
605 spin_unlock(&dq_list_lock
);
607 return (dqstats
.free_dquots
/ 100) * sysctl_vfs_cache_pressure
;
610 static struct shrinker dqcache_shrinker
= {
611 .shrink
= shrink_dqcache_memory
,
612 .seeks
= DEFAULT_SEEKS
,
616 * Put reference to dquot
617 * NOTE: If you change this function please check whether dqput_blocks() works right...
619 void dqput(struct dquot
*dquot
)
625 #ifdef __DQUOT_PARANOIA
626 if (!atomic_read(&dquot
->dq_count
)) {
627 printk("VFS: dqput: trying to free free dquot\n");
628 printk("VFS: device %s, dquot of %s %d\n",
630 quotatypes
[dquot
->dq_type
],
636 spin_lock(&dq_list_lock
);
638 spin_unlock(&dq_list_lock
);
640 spin_lock(&dq_list_lock
);
641 if (atomic_read(&dquot
->dq_count
) > 1) {
642 /* We have more than one user... nothing to do */
643 atomic_dec(&dquot
->dq_count
);
644 /* Releasing dquot during quotaoff phase? */
645 if (!sb_has_quota_active(dquot
->dq_sb
, dquot
->dq_type
) &&
646 atomic_read(&dquot
->dq_count
) == 1)
647 wake_up(&dquot
->dq_wait_unused
);
648 spin_unlock(&dq_list_lock
);
651 /* Need to release dquot? */
652 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && dquot_dirty(dquot
)) {
653 spin_unlock(&dq_list_lock
);
654 /* Commit dquot before releasing */
655 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
657 printk(KERN_ERR
"VFS: cannot write quota structure on "
658 "device %s (error %d). Quota may get out of "
659 "sync!\n", dquot
->dq_sb
->s_id
, ret
);
661 * We clear dirty bit anyway, so that we avoid
664 spin_lock(&dq_list_lock
);
665 clear_dquot_dirty(dquot
);
666 spin_unlock(&dq_list_lock
);
670 /* Clear flag in case dquot was inactive (something bad happened) */
671 clear_dquot_dirty(dquot
);
672 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
673 spin_unlock(&dq_list_lock
);
674 dquot
->dq_sb
->dq_op
->release_dquot(dquot
);
677 atomic_dec(&dquot
->dq_count
);
678 #ifdef __DQUOT_PARANOIA
680 BUG_ON(!list_empty(&dquot
->dq_free
));
682 put_dquot_last(dquot
);
683 spin_unlock(&dq_list_lock
);
685 EXPORT_SYMBOL(dqput
);
687 struct dquot
*dquot_alloc(struct super_block
*sb
, int type
)
689 return kmem_cache_zalloc(dquot_cachep
, GFP_NOFS
);
691 EXPORT_SYMBOL(dquot_alloc
);
693 static struct dquot
*get_empty_dquot(struct super_block
*sb
, int type
)
697 dquot
= sb
->dq_op
->alloc_dquot(sb
, type
);
701 mutex_init(&dquot
->dq_lock
);
702 INIT_LIST_HEAD(&dquot
->dq_free
);
703 INIT_LIST_HEAD(&dquot
->dq_inuse
);
704 INIT_HLIST_NODE(&dquot
->dq_hash
);
705 INIT_LIST_HEAD(&dquot
->dq_dirty
);
706 init_waitqueue_head(&dquot
->dq_wait_unused
);
708 dquot
->dq_type
= type
;
709 atomic_set(&dquot
->dq_count
, 1);
715 * Get reference to dquot
717 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
718 * destroying our dquot by:
719 * a) checking for quota flags under dq_list_lock and
720 * b) getting a reference to dquot before we release dq_list_lock
722 struct dquot
*dqget(struct super_block
*sb
, unsigned int id
, int type
)
724 unsigned int hashent
= hashfn(sb
, id
, type
);
725 struct dquot
*dquot
= NODQUOT
, *empty
= NODQUOT
;
727 if (!sb_has_quota_active(sb
, type
))
730 spin_lock(&dq_list_lock
);
731 spin_lock(&dq_state_lock
);
732 if (!sb_has_quota_active(sb
, type
)) {
733 spin_unlock(&dq_state_lock
);
734 spin_unlock(&dq_list_lock
);
737 spin_unlock(&dq_state_lock
);
739 if ((dquot
= find_dquot(hashent
, sb
, id
, type
)) == NODQUOT
) {
740 if (empty
== NODQUOT
) {
741 spin_unlock(&dq_list_lock
);
742 if ((empty
= get_empty_dquot(sb
, type
)) == NODQUOT
)
743 schedule(); /* Try to wait for a moment... */
749 /* all dquots go on the inuse_list */
751 /* hash it first so it can be found */
752 insert_dquot_hash(dquot
);
754 spin_unlock(&dq_list_lock
);
756 if (!atomic_read(&dquot
->dq_count
))
757 remove_free_dquot(dquot
);
758 atomic_inc(&dquot
->dq_count
);
759 dqstats
.cache_hits
++;
761 spin_unlock(&dq_list_lock
);
763 /* Wait for dq_lock - after this we know that either dquot_release() is already
764 * finished or it will be canceled due to dq_count > 1 test */
765 wait_on_dquot(dquot
);
766 /* Read the dquot and instantiate it (everything done only if needed) */
767 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && sb
->dq_op
->acquire_dquot(dquot
) < 0) {
772 #ifdef __DQUOT_PARANOIA
773 BUG_ON(!dquot
->dq_sb
); /* Has somebody invalidated entry under us? */
777 do_destroy_dquot(empty
);
781 EXPORT_SYMBOL(dqget
);
783 static int dqinit_needed(struct inode
*inode
, int type
)
787 if (IS_NOQUOTA(inode
))
790 return inode
->i_dquot
[type
] == NODQUOT
;
791 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
792 if (inode
->i_dquot
[cnt
] == NODQUOT
)
797 /* This routine is guarded by dqonoff_mutex mutex */
798 static void add_dquot_ref(struct super_block
*sb
, int type
)
800 struct inode
*inode
, *old_inode
= NULL
;
802 spin_lock(&inode_lock
);
803 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
804 if (!atomic_read(&inode
->i_writecount
))
806 if (!dqinit_needed(inode
, type
))
808 if (inode
->i_state
& (I_FREEING
|I_WILL_FREE
))
812 spin_unlock(&inode_lock
);
815 sb
->dq_op
->initialize(inode
, type
);
816 /* We hold a reference to 'inode' so it couldn't have been
817 * removed from s_inodes list while we dropped the inode_lock.
818 * We cannot iput the inode now as we can be holding the last
819 * reference and we cannot iput it under inode_lock. So we
820 * keep the reference and iput it later. */
822 spin_lock(&inode_lock
);
824 spin_unlock(&inode_lock
);
828 /* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */
829 static inline int dqput_blocks(struct dquot
*dquot
)
831 if (atomic_read(&dquot
->dq_count
) <= 1)
836 /* Remove references to dquots from inode - add dquot to list for freeing if needed */
837 /* We can't race with anybody because we hold dqptr_sem for writing... */
838 static int remove_inode_dquot_ref(struct inode
*inode
, int type
,
839 struct list_head
*tofree_head
)
841 struct dquot
*dquot
= inode
->i_dquot
[type
];
843 inode
->i_dquot
[type
] = NODQUOT
;
844 if (dquot
!= NODQUOT
) {
845 if (dqput_blocks(dquot
)) {
846 #ifdef __DQUOT_PARANOIA
847 if (atomic_read(&dquot
->dq_count
) != 1)
848 printk(KERN_WARNING
"VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot
->dq_count
));
850 spin_lock(&dq_list_lock
);
851 list_add(&dquot
->dq_free
, tofree_head
); /* As dquot must have currently users it can't be on the free list... */
852 spin_unlock(&dq_list_lock
);
856 dqput(dquot
); /* We have guaranteed we won't block */
861 /* Free list of dquots - called from inode.c */
862 /* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */
863 static void put_dquot_list(struct list_head
*tofree_head
)
865 struct list_head
*act_head
;
868 act_head
= tofree_head
->next
;
869 /* So now we have dquots on the list... Just free them */
870 while (act_head
!= tofree_head
) {
871 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
872 act_head
= act_head
->next
;
873 list_del_init(&dquot
->dq_free
); /* Remove dquot from the list so we won't have problems... */
878 static void remove_dquot_ref(struct super_block
*sb
, int type
,
879 struct list_head
*tofree_head
)
883 spin_lock(&inode_lock
);
884 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
885 if (!IS_NOQUOTA(inode
))
886 remove_inode_dquot_ref(inode
, type
, tofree_head
);
888 spin_unlock(&inode_lock
);
891 /* Gather all references from inodes and drop them */
892 static void drop_dquot_ref(struct super_block
*sb
, int type
)
894 LIST_HEAD(tofree_head
);
897 down_write(&sb_dqopt(sb
)->dqptr_sem
);
898 remove_dquot_ref(sb
, type
, &tofree_head
);
899 up_write(&sb_dqopt(sb
)->dqptr_sem
);
900 put_dquot_list(&tofree_head
);
904 static inline void dquot_incr_inodes(struct dquot
*dquot
, qsize_t number
)
906 dquot
->dq_dqb
.dqb_curinodes
+= number
;
909 static inline void dquot_incr_space(struct dquot
*dquot
, qsize_t number
)
911 dquot
->dq_dqb
.dqb_curspace
+= number
;
914 static inline void dquot_resv_space(struct dquot
*dquot
, qsize_t number
)
916 dquot
->dq_dqb
.dqb_rsvspace
+= number
;
920 * Claim reserved quota space
922 static void dquot_claim_reserved_space(struct dquot
*dquot
,
925 WARN_ON(dquot
->dq_dqb
.dqb_rsvspace
< number
);
926 dquot
->dq_dqb
.dqb_curspace
+= number
;
927 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
931 void dquot_free_reserved_space(struct dquot
*dquot
, qsize_t number
)
933 dquot
->dq_dqb
.dqb_rsvspace
-= number
;
936 static inline void dquot_decr_inodes(struct dquot
*dquot
, qsize_t number
)
938 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
939 dquot
->dq_dqb
.dqb_curinodes
>= number
)
940 dquot
->dq_dqb
.dqb_curinodes
-= number
;
942 dquot
->dq_dqb
.dqb_curinodes
= 0;
943 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
944 dquot
->dq_dqb
.dqb_itime
= (time_t) 0;
945 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
948 static inline void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
950 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
951 dquot
->dq_dqb
.dqb_curspace
>= number
)
952 dquot
->dq_dqb
.dqb_curspace
-= number
;
954 dquot
->dq_dqb
.dqb_curspace
= 0;
955 if (dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
956 dquot
->dq_dqb
.dqb_btime
= (time_t) 0;
957 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
960 static int warning_issued(struct dquot
*dquot
, const int warntype
)
962 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
963 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
964 ((warntype
== QUOTA_NL_IHARDWARN
||
965 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
969 return test_and_set_bit(flag
, &dquot
->dq_flags
);
972 #ifdef CONFIG_PRINT_QUOTA_WARNING
973 static int flag_print_warnings
= 1;
975 static inline int need_print_warning(struct dquot
*dquot
)
977 if (!flag_print_warnings
)
980 switch (dquot
->dq_type
) {
982 return current_fsuid() == dquot
->dq_id
;
984 return in_group_p(dquot
->dq_id
);
989 /* Print warning to user which exceeded quota */
990 static void print_warning(struct dquot
*dquot
, const int warntype
)
993 struct tty_struct
*tty
;
995 if (warntype
== QUOTA_NL_IHARDBELOW
||
996 warntype
== QUOTA_NL_ISOFTBELOW
||
997 warntype
== QUOTA_NL_BHARDBELOW
||
998 warntype
== QUOTA_NL_BSOFTBELOW
|| !need_print_warning(dquot
))
1001 tty
= get_current_tty();
1004 tty_write_message(tty
, dquot
->dq_sb
->s_id
);
1005 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
1006 tty_write_message(tty
, ": warning, ");
1008 tty_write_message(tty
, ": write failed, ");
1009 tty_write_message(tty
, quotatypes
[dquot
->dq_type
]);
1011 case QUOTA_NL_IHARDWARN
:
1012 msg
= " file limit reached.\r\n";
1014 case QUOTA_NL_ISOFTLONGWARN
:
1015 msg
= " file quota exceeded too long.\r\n";
1017 case QUOTA_NL_ISOFTWARN
:
1018 msg
= " file quota exceeded.\r\n";
1020 case QUOTA_NL_BHARDWARN
:
1021 msg
= " block limit reached.\r\n";
1023 case QUOTA_NL_BSOFTLONGWARN
:
1024 msg
= " block quota exceeded too long.\r\n";
1026 case QUOTA_NL_BSOFTWARN
:
1027 msg
= " block quota exceeded.\r\n";
1030 tty_write_message(tty
, msg
);
1035 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
1037 /* Netlink family structure for quota */
1038 static struct genl_family quota_genl_family
= {
1039 .id
= GENL_ID_GENERATE
,
1041 .name
= "VFS_DQUOT",
1043 .maxattr
= QUOTA_NL_A_MAX
,
1046 /* Send warning to userspace about user which exceeded quota */
1047 static void send_warning(const struct dquot
*dquot
, const char warntype
)
1049 static atomic_t seq
;
1050 struct sk_buff
*skb
;
1053 int msg_size
= 4 * nla_total_size(sizeof(u32
)) +
1054 2 * nla_total_size(sizeof(u64
));
1056 /* We have to allocate using GFP_NOFS as we are called from a
1057 * filesystem performing write and thus further recursion into
1058 * the fs to free some data could cause deadlocks. */
1059 skb
= genlmsg_new(msg_size
, GFP_NOFS
);
1062 "VFS: Not enough memory to send quota warning.\n");
1065 msg_head
= genlmsg_put(skb
, 0, atomic_add_return(1, &seq
),
1066 "a_genl_family
, 0, QUOTA_NL_C_WARNING
);
1069 "VFS: Cannot store netlink header in quota warning.\n");
1072 ret
= nla_put_u32(skb
, QUOTA_NL_A_QTYPE
, dquot
->dq_type
);
1075 ret
= nla_put_u64(skb
, QUOTA_NL_A_EXCESS_ID
, dquot
->dq_id
);
1078 ret
= nla_put_u32(skb
, QUOTA_NL_A_WARNING
, warntype
);
1081 ret
= nla_put_u32(skb
, QUOTA_NL_A_DEV_MAJOR
,
1082 MAJOR(dquot
->dq_sb
->s_dev
));
1085 ret
= nla_put_u32(skb
, QUOTA_NL_A_DEV_MINOR
,
1086 MINOR(dquot
->dq_sb
->s_dev
));
1089 ret
= nla_put_u64(skb
, QUOTA_NL_A_CAUSED_ID
, current_uid());
1092 genlmsg_end(skb
, msg_head
);
1094 ret
= genlmsg_multicast(skb
, 0, quota_genl_family
.id
, GFP_NOFS
);
1095 if (ret
< 0 && ret
!= -ESRCH
)
1097 "VFS: Failed to send notification message: %d\n", ret
);
1100 printk(KERN_ERR
"VFS: Not enough space to compose quota message!\n");
1106 * Write warnings to the console and send warning messages over netlink.
1108 * Note that this function can sleep.
1110 static inline void flush_warnings(struct dquot
* const *dquots
, char *warntype
)
1114 for (i
= 0; i
< MAXQUOTAS
; i
++)
1115 if (dquots
[i
] != NODQUOT
&& warntype
[i
] != QUOTA_NL_NOWARN
&&
1116 !warning_issued(dquots
[i
], warntype
[i
])) {
1117 #ifdef CONFIG_PRINT_QUOTA_WARNING
1118 print_warning(dquots
[i
], warntype
[i
]);
1120 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
1121 send_warning(dquots
[i
], warntype
[i
]);
1126 static inline char ignore_hardlimit(struct dquot
*dquot
)
1128 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
1130 return capable(CAP_SYS_RESOURCE
) &&
1131 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
|| !(info
->dqi_flags
& V1_DQF_RSQUASH
));
1134 /* needs dq_data_lock */
1135 static int check_idq(struct dquot
*dquot
, qsize_t inodes
, char *warntype
)
1137 *warntype
= QUOTA_NL_NOWARN
;
1138 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
) ||
1139 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1142 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1143 (dquot
->dq_dqb
.dqb_curinodes
+ inodes
) > dquot
->dq_dqb
.dqb_ihardlimit
&&
1144 !ignore_hardlimit(dquot
)) {
1145 *warntype
= QUOTA_NL_IHARDWARN
;
1149 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1150 (dquot
->dq_dqb
.dqb_curinodes
+ inodes
) > dquot
->dq_dqb
.dqb_isoftlimit
&&
1151 dquot
->dq_dqb
.dqb_itime
&& get_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1152 !ignore_hardlimit(dquot
)) {
1153 *warntype
= QUOTA_NL_ISOFTLONGWARN
;
1157 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1158 (dquot
->dq_dqb
.dqb_curinodes
+ inodes
) > dquot
->dq_dqb
.dqb_isoftlimit
&&
1159 dquot
->dq_dqb
.dqb_itime
== 0) {
1160 *warntype
= QUOTA_NL_ISOFTWARN
;
1161 dquot
->dq_dqb
.dqb_itime
= get_seconds() + sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_igrace
;
1167 /* needs dq_data_lock */
1168 static int check_bdq(struct dquot
*dquot
, qsize_t space
, int prealloc
, char *warntype
)
1172 *warntype
= QUOTA_NL_NOWARN
;
1173 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
) ||
1174 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1177 tspace
= dquot
->dq_dqb
.dqb_curspace
+ dquot
->dq_dqb
.dqb_rsvspace
1180 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1181 tspace
> dquot
->dq_dqb
.dqb_bhardlimit
&&
1182 !ignore_hardlimit(dquot
)) {
1184 *warntype
= QUOTA_NL_BHARDWARN
;
1188 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1189 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1190 dquot
->dq_dqb
.dqb_btime
&& get_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1191 !ignore_hardlimit(dquot
)) {
1193 *warntype
= QUOTA_NL_BSOFTLONGWARN
;
1197 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1198 tspace
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1199 dquot
->dq_dqb
.dqb_btime
== 0) {
1201 *warntype
= QUOTA_NL_BSOFTWARN
;
1202 dquot
->dq_dqb
.dqb_btime
= get_seconds() + sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_bgrace
;
1206 * We don't allow preallocation to exceed softlimit so exceeding will
1215 static int info_idq_free(struct dquot
*dquot
, qsize_t inodes
)
1217 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1218 dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
||
1219 !sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
))
1220 return QUOTA_NL_NOWARN
;
1222 if (dquot
->dq_dqb
.dqb_curinodes
- inodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1223 return QUOTA_NL_ISOFTBELOW
;
1224 if (dquot
->dq_dqb
.dqb_curinodes
>= dquot
->dq_dqb
.dqb_ihardlimit
&&
1225 dquot
->dq_dqb
.dqb_curinodes
- inodes
< dquot
->dq_dqb
.dqb_ihardlimit
)
1226 return QUOTA_NL_IHARDBELOW
;
1227 return QUOTA_NL_NOWARN
;
1230 static int info_bdq_free(struct dquot
*dquot
, qsize_t space
)
1232 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1233 dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1234 return QUOTA_NL_NOWARN
;
1236 if (dquot
->dq_dqb
.dqb_curspace
- space
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1237 return QUOTA_NL_BSOFTBELOW
;
1238 if (dquot
->dq_dqb
.dqb_curspace
>= dquot
->dq_dqb
.dqb_bhardlimit
&&
1239 dquot
->dq_dqb
.dqb_curspace
- space
< dquot
->dq_dqb
.dqb_bhardlimit
)
1240 return QUOTA_NL_BHARDBELOW
;
1241 return QUOTA_NL_NOWARN
;
1244 * Initialize quota pointers in inode
1245 * We do things in a bit complicated way but by that we avoid calling
1246 * dqget() and thus filesystem callbacks under dqptr_sem.
1248 int dquot_initialize(struct inode
*inode
, int type
)
1250 unsigned int id
= 0;
1252 struct dquot
*got
[MAXQUOTAS
] = { NODQUOT
, NODQUOT
};
1253 struct super_block
*sb
= inode
->i_sb
;
1255 /* First test before acquiring mutex - solves deadlocks when we
1256 * re-enter the quota code and are already holding the mutex */
1257 if (IS_NOQUOTA(inode
))
1260 /* First get references to structures we might need. */
1261 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1262 if (type
!= -1 && cnt
!= type
)
1272 got
[cnt
] = dqget(sb
, id
, cnt
);
1275 down_write(&sb_dqopt(sb
)->dqptr_sem
);
1276 /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
1277 if (IS_NOQUOTA(inode
))
1279 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1280 if (type
!= -1 && cnt
!= type
)
1282 /* Avoid races with quotaoff() */
1283 if (!sb_has_quota_active(sb
, cnt
))
1285 if (inode
->i_dquot
[cnt
] == NODQUOT
) {
1286 inode
->i_dquot
[cnt
] = got
[cnt
];
1291 up_write(&sb_dqopt(sb
)->dqptr_sem
);
1292 /* Drop unused references */
1293 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1297 EXPORT_SYMBOL(dquot_initialize
);
1300 * Release all quotas referenced by inode
1302 int dquot_drop(struct inode
*inode
)
1305 struct dquot
*put
[MAXQUOTAS
];
1307 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1308 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1309 put
[cnt
] = inode
->i_dquot
[cnt
];
1310 inode
->i_dquot
[cnt
] = NODQUOT
;
1312 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1314 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1318 EXPORT_SYMBOL(dquot_drop
);
1320 /* Wrapper to remove references to quota structures from inode */
1321 void vfs_dq_drop(struct inode
*inode
)
1323 /* Here we can get arbitrary inode from clear_inode() so we have
1324 * to be careful. OTOH we don't need locking as quota operations
1325 * are allowed to change only at mount time */
1326 if (!IS_NOQUOTA(inode
) && inode
->i_sb
&& inode
->i_sb
->dq_op
1327 && inode
->i_sb
->dq_op
->drop
) {
1329 /* Test before calling to rule out calls from proc and such
1330 * where we are not allowed to block. Note that this is
1331 * actually reliable test even without the lock - the caller
1332 * must assure that nobody can come after the DQUOT_DROP and
1333 * add quota pointers back anyway */
1334 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1335 if (inode
->i_dquot
[cnt
] != NODQUOT
)
1337 if (cnt
< MAXQUOTAS
)
1338 inode
->i_sb
->dq_op
->drop(inode
);
1341 EXPORT_SYMBOL(vfs_dq_drop
);
1344 * Following four functions update i_blocks+i_bytes fields and
1345 * quota information (together with appropriate checks)
1346 * NOTE: We absolutely rely on the fact that caller dirties
1347 * the inode (usually macros in quotaops.h care about this) and
1348 * holds a handle for the current transaction so that dquot write and
1349 * inode write go into the same transaction.
1353 * This operation can block, but only after everything is updated
1355 int __dquot_alloc_space(struct inode
*inode
, qsize_t number
,
1356 int warn
, int reserve
)
1358 int cnt
, ret
= QUOTA_OK
;
1359 char warntype
[MAXQUOTAS
];
1361 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1362 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1364 spin_lock(&dq_data_lock
);
1365 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1366 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1368 if (check_bdq(inode
->i_dquot
[cnt
], number
, warn
, warntype
+cnt
)
1374 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1375 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1378 dquot_resv_space(inode
->i_dquot
[cnt
], number
);
1380 dquot_incr_space(inode
->i_dquot
[cnt
], number
);
1383 inode_add_bytes(inode
, number
);
1385 spin_unlock(&dq_data_lock
);
1386 flush_warnings(inode
->i_dquot
, warntype
);
1390 int dquot_alloc_space(struct inode
*inode
, qsize_t number
, int warn
)
1392 int cnt
, ret
= QUOTA_OK
;
1395 * First test before acquiring mutex - solves deadlocks when we
1396 * re-enter the quota code and are already holding the mutex
1398 if (IS_NOQUOTA(inode
)) {
1399 inode_add_bytes(inode
, number
);
1403 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1404 if (IS_NOQUOTA(inode
)) {
1405 inode_add_bytes(inode
, number
);
1409 ret
= __dquot_alloc_space(inode
, number
, warn
, 0);
1410 if (ret
== NO_QUOTA
)
1413 /* Dirtify all the dquots - this can block when journalling */
1414 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1415 if (inode
->i_dquot
[cnt
])
1416 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1418 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1422 EXPORT_SYMBOL(dquot_alloc_space
);
1424 int dquot_reserve_space(struct inode
*inode
, qsize_t number
, int warn
)
1428 if (IS_NOQUOTA(inode
))
1431 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1432 if (IS_NOQUOTA(inode
))
1435 ret
= __dquot_alloc_space(inode
, number
, warn
, 1);
1437 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1441 EXPORT_SYMBOL(dquot_reserve_space
);
1444 * This operation can block, but only after everything is updated
1446 int dquot_alloc_inode(const struct inode
*inode
, qsize_t number
)
1448 int cnt
, ret
= NO_QUOTA
;
1449 char warntype
[MAXQUOTAS
];
1451 /* First test before acquiring mutex - solves deadlocks when we
1452 * re-enter the quota code and are already holding the mutex */
1453 if (IS_NOQUOTA(inode
))
1455 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1456 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1457 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1458 if (IS_NOQUOTA(inode
)) {
1459 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1462 spin_lock(&dq_data_lock
);
1463 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1464 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1466 if (check_idq(inode
->i_dquot
[cnt
], number
, warntype
+cnt
) == NO_QUOTA
)
1470 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1471 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1473 dquot_incr_inodes(inode
->i_dquot
[cnt
], number
);
1477 spin_unlock(&dq_data_lock
);
1478 if (ret
== QUOTA_OK
)
1479 /* Dirtify all the dquots - this can block when journalling */
1480 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1481 if (inode
->i_dquot
[cnt
])
1482 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1483 flush_warnings(inode
->i_dquot
, warntype
);
1484 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1487 EXPORT_SYMBOL(dquot_alloc_inode
);
1489 int dquot_claim_space(struct inode
*inode
, qsize_t number
)
1494 if (IS_NOQUOTA(inode
)) {
1495 inode_add_bytes(inode
, number
);
1499 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1500 if (IS_NOQUOTA(inode
)) {
1501 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1502 inode_add_bytes(inode
, number
);
1506 spin_lock(&dq_data_lock
);
1507 /* Claim reserved quotas to allocated quotas */
1508 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1509 if (inode
->i_dquot
[cnt
] != NODQUOT
)
1510 dquot_claim_reserved_space(inode
->i_dquot
[cnt
],
1513 /* Update inode bytes */
1514 inode_add_bytes(inode
, number
);
1515 spin_unlock(&dq_data_lock
);
1516 /* Dirtify all the dquots - this can block when journalling */
1517 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1518 if (inode
->i_dquot
[cnt
])
1519 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1520 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1524 EXPORT_SYMBOL(dquot_claim_space
);
1527 * Release reserved quota space
1529 void dquot_release_reserved_space(struct inode
*inode
, qsize_t number
)
1533 if (IS_NOQUOTA(inode
))
1536 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1537 if (IS_NOQUOTA(inode
))
1540 spin_lock(&dq_data_lock
);
1541 /* Release reserved dquots */
1542 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1543 if (inode
->i_dquot
[cnt
] != NODQUOT
)
1544 dquot_free_reserved_space(inode
->i_dquot
[cnt
], number
);
1546 spin_unlock(&dq_data_lock
);
1549 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1553 EXPORT_SYMBOL(dquot_release_reserved_space
);
1556 * This operation can block, but only after everything is updated
1558 int dquot_free_space(struct inode
*inode
, qsize_t number
)
1561 char warntype
[MAXQUOTAS
];
1563 /* First test before acquiring mutex - solves deadlocks when we
1564 * re-enter the quota code and are already holding the mutex */
1565 if (IS_NOQUOTA(inode
)) {
1567 inode_sub_bytes(inode
, number
);
1571 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1572 /* Now recheck reliably when holding dqptr_sem */
1573 if (IS_NOQUOTA(inode
)) {
1574 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1577 spin_lock(&dq_data_lock
);
1578 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1579 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1581 warntype
[cnt
] = info_bdq_free(inode
->i_dquot
[cnt
], number
);
1582 dquot_decr_space(inode
->i_dquot
[cnt
], number
);
1584 inode_sub_bytes(inode
, number
);
1585 spin_unlock(&dq_data_lock
);
1586 /* Dirtify all the dquots - this can block when journalling */
1587 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1588 if (inode
->i_dquot
[cnt
])
1589 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1590 flush_warnings(inode
->i_dquot
, warntype
);
1591 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1594 EXPORT_SYMBOL(dquot_free_space
);
1597 * This operation can block, but only after everything is updated
1599 int dquot_free_inode(const struct inode
*inode
, qsize_t number
)
1602 char warntype
[MAXQUOTAS
];
1604 /* First test before acquiring mutex - solves deadlocks when we
1605 * re-enter the quota code and are already holding the mutex */
1606 if (IS_NOQUOTA(inode
))
1609 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1610 /* Now recheck reliably when holding dqptr_sem */
1611 if (IS_NOQUOTA(inode
)) {
1612 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1615 spin_lock(&dq_data_lock
);
1616 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1617 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1619 warntype
[cnt
] = info_idq_free(inode
->i_dquot
[cnt
], number
);
1620 dquot_decr_inodes(inode
->i_dquot
[cnt
], number
);
1622 spin_unlock(&dq_data_lock
);
1623 /* Dirtify all the dquots - this can block when journalling */
1624 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1625 if (inode
->i_dquot
[cnt
])
1626 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1627 flush_warnings(inode
->i_dquot
, warntype
);
1628 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1631 EXPORT_SYMBOL(dquot_free_inode
);
1634 * call back function, get reserved quota space from underlying fs
1636 qsize_t
dquot_get_reserved_space(struct inode
*inode
)
1638 qsize_t reserved_space
= 0;
1640 if (sb_any_quota_active(inode
->i_sb
) &&
1641 inode
->i_sb
->dq_op
->get_reserved_space
)
1642 reserved_space
= inode
->i_sb
->dq_op
->get_reserved_space(inode
);
1643 return reserved_space
;
1647 * Transfer the number of inode and blocks from one diskquota to an other.
1649 * This operation can block, but only after everything is updated
1650 * A transaction must be started when entering this function.
1652 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
1654 qsize_t space
, cur_space
;
1655 qsize_t rsv_space
= 0;
1656 struct dquot
*transfer_from
[MAXQUOTAS
];
1657 struct dquot
*transfer_to
[MAXQUOTAS
];
1658 int cnt
, ret
= QUOTA_OK
;
1659 int chuid
= iattr
->ia_valid
& ATTR_UID
&& inode
->i_uid
!= iattr
->ia_uid
,
1660 chgid
= iattr
->ia_valid
& ATTR_GID
&& inode
->i_gid
!= iattr
->ia_gid
;
1661 char warntype_to
[MAXQUOTAS
];
1662 char warntype_from_inodes
[MAXQUOTAS
], warntype_from_space
[MAXQUOTAS
];
1664 /* First test before acquiring mutex - solves deadlocks when we
1665 * re-enter the quota code and are already holding the mutex */
1666 if (IS_NOQUOTA(inode
))
1668 /* Initialize the arrays */
1669 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1670 transfer_from
[cnt
] = NODQUOT
;
1671 transfer_to
[cnt
] = NODQUOT
;
1672 warntype_to
[cnt
] = QUOTA_NL_NOWARN
;
1677 transfer_to
[cnt
] = dqget(inode
->i_sb
, iattr
->ia_uid
, cnt
);
1682 transfer_to
[cnt
] = dqget(inode
->i_sb
, iattr
->ia_gid
, cnt
);
1687 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1688 /* Now recheck reliably when holding dqptr_sem */
1689 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1690 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1693 spin_lock(&dq_data_lock
);
1694 cur_space
= inode_get_bytes(inode
);
1695 rsv_space
= dquot_get_reserved_space(inode
);
1696 space
= cur_space
+ rsv_space
;
1697 /* Build the transfer_from list and check the limits */
1698 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1699 if (transfer_to
[cnt
] == NODQUOT
)
1701 transfer_from
[cnt
] = inode
->i_dquot
[cnt
];
1702 if (check_idq(transfer_to
[cnt
], 1, warntype_to
+ cnt
) ==
1703 NO_QUOTA
|| check_bdq(transfer_to
[cnt
], space
, 0,
1704 warntype_to
+ cnt
) == NO_QUOTA
)
1709 * Finally perform the needed transfer from transfer_from to transfer_to
1711 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1713 * Skip changes for same uid or gid or for turned off quota-type.
1715 if (transfer_to
[cnt
] == NODQUOT
)
1718 /* Due to IO error we might not have transfer_from[] structure */
1719 if (transfer_from
[cnt
]) {
1720 warntype_from_inodes
[cnt
] =
1721 info_idq_free(transfer_from
[cnt
], 1);
1722 warntype_from_space
[cnt
] =
1723 info_bdq_free(transfer_from
[cnt
], space
);
1724 dquot_decr_inodes(transfer_from
[cnt
], 1);
1725 dquot_decr_space(transfer_from
[cnt
], cur_space
);
1726 dquot_free_reserved_space(transfer_from
[cnt
],
1730 dquot_incr_inodes(transfer_to
[cnt
], 1);
1731 dquot_incr_space(transfer_to
[cnt
], cur_space
);
1732 dquot_resv_space(transfer_to
[cnt
], rsv_space
);
1734 inode
->i_dquot
[cnt
] = transfer_to
[cnt
];
1736 spin_unlock(&dq_data_lock
);
1737 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1739 /* Dirtify all the dquots - this can block when journalling */
1740 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1741 if (transfer_from
[cnt
])
1742 mark_dquot_dirty(transfer_from
[cnt
]);
1743 if (transfer_to
[cnt
]) {
1744 mark_dquot_dirty(transfer_to
[cnt
]);
1745 /* The reference we got is transferred to the inode */
1746 transfer_to
[cnt
] = NODQUOT
;
1750 flush_warnings(transfer_to
, warntype_to
);
1751 flush_warnings(transfer_from
, warntype_from_inodes
);
1752 flush_warnings(transfer_from
, warntype_from_space
);
1754 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1755 dqput(transfer_from
[cnt
]);
1756 dqput(transfer_to
[cnt
]);
1760 spin_unlock(&dq_data_lock
);
1761 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1762 /* Clear dquot pointers we don't want to dqput() */
1763 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1764 transfer_from
[cnt
] = NODQUOT
;
1768 EXPORT_SYMBOL(dquot_transfer
);
1770 /* Wrapper for transferring ownership of an inode */
1771 int vfs_dq_transfer(struct inode
*inode
, struct iattr
*iattr
)
1773 if (sb_any_quota_active(inode
->i_sb
) && !IS_NOQUOTA(inode
)) {
1775 if (inode
->i_sb
->dq_op
->transfer(inode
, iattr
) == NO_QUOTA
)
1780 EXPORT_SYMBOL(vfs_dq_transfer
);
1783 * Write info of quota file to disk
1785 int dquot_commit_info(struct super_block
*sb
, int type
)
1788 struct quota_info
*dqopt
= sb_dqopt(sb
);
1790 mutex_lock(&dqopt
->dqio_mutex
);
1791 ret
= dqopt
->ops
[type
]->write_file_info(sb
, type
);
1792 mutex_unlock(&dqopt
->dqio_mutex
);
1795 EXPORT_SYMBOL(dquot_commit_info
);
1798 * Definitions of diskquota operations.
1800 struct dquot_operations dquot_operations
= {
1801 .initialize
= dquot_initialize
,
1803 .alloc_space
= dquot_alloc_space
,
1804 .alloc_inode
= dquot_alloc_inode
,
1805 .free_space
= dquot_free_space
,
1806 .free_inode
= dquot_free_inode
,
1807 .transfer
= dquot_transfer
,
1808 .write_dquot
= dquot_commit
,
1809 .acquire_dquot
= dquot_acquire
,
1810 .release_dquot
= dquot_release
,
1811 .mark_dirty
= dquot_mark_dquot_dirty
,
1812 .write_info
= dquot_commit_info
,
1813 .alloc_dquot
= dquot_alloc
,
1814 .destroy_dquot
= dquot_destroy
,
1818 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1820 int vfs_quota_disable(struct super_block
*sb
, int type
, unsigned int flags
)
1823 struct quota_info
*dqopt
= sb_dqopt(sb
);
1824 struct inode
*toputinode
[MAXQUOTAS
];
1826 /* Cannot turn off usage accounting without turning off limits, or
1827 * suspend quotas and simultaneously turn quotas off. */
1828 if ((flags
& DQUOT_USAGE_ENABLED
&& !(flags
& DQUOT_LIMITS_ENABLED
))
1829 || (flags
& DQUOT_SUSPENDED
&& flags
& (DQUOT_LIMITS_ENABLED
|
1830 DQUOT_USAGE_ENABLED
)))
1833 /* We need to serialize quota_off() for device */
1834 mutex_lock(&dqopt
->dqonoff_mutex
);
1837 * Skip everything if there's nothing to do. We have to do this because
1838 * sometimes we are called when fill_super() failed and calling
1839 * sync_fs() in such cases does no good.
1841 if (!sb_any_quota_loaded(sb
)) {
1842 mutex_unlock(&dqopt
->dqonoff_mutex
);
1845 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1846 toputinode
[cnt
] = NULL
;
1847 if (type
!= -1 && cnt
!= type
)
1849 if (!sb_has_quota_loaded(sb
, cnt
))
1852 if (flags
& DQUOT_SUSPENDED
) {
1853 spin_lock(&dq_state_lock
);
1855 dquot_state_flag(DQUOT_SUSPENDED
, cnt
);
1856 spin_unlock(&dq_state_lock
);
1858 spin_lock(&dq_state_lock
);
1859 dqopt
->flags
&= ~dquot_state_flag(flags
, cnt
);
1860 /* Turning off suspended quotas? */
1861 if (!sb_has_quota_loaded(sb
, cnt
) &&
1862 sb_has_quota_suspended(sb
, cnt
)) {
1863 dqopt
->flags
&= ~dquot_state_flag(
1864 DQUOT_SUSPENDED
, cnt
);
1865 spin_unlock(&dq_state_lock
);
1866 iput(dqopt
->files
[cnt
]);
1867 dqopt
->files
[cnt
] = NULL
;
1870 spin_unlock(&dq_state_lock
);
1873 /* We still have to keep quota loaded? */
1874 if (sb_has_quota_loaded(sb
, cnt
) && !(flags
& DQUOT_SUSPENDED
))
1877 /* Note: these are blocking operations */
1878 drop_dquot_ref(sb
, cnt
);
1879 invalidate_dquots(sb
, cnt
);
1881 * Now all dquots should be invalidated, all writes done so we should be only
1882 * users of the info. No locks needed.
1884 if (info_dirty(&dqopt
->info
[cnt
]))
1885 sb
->dq_op
->write_info(sb
, cnt
);
1886 if (dqopt
->ops
[cnt
]->free_file_info
)
1887 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
1888 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
1890 toputinode
[cnt
] = dqopt
->files
[cnt
];
1891 if (!sb_has_quota_loaded(sb
, cnt
))
1892 dqopt
->files
[cnt
] = NULL
;
1893 dqopt
->info
[cnt
].dqi_flags
= 0;
1894 dqopt
->info
[cnt
].dqi_igrace
= 0;
1895 dqopt
->info
[cnt
].dqi_bgrace
= 0;
1896 dqopt
->ops
[cnt
] = NULL
;
1898 mutex_unlock(&dqopt
->dqonoff_mutex
);
1900 /* Skip syncing and setting flags if quota files are hidden */
1901 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
1904 /* Sync the superblock so that buffers with quota data are written to
1905 * disk (and so userspace sees correct data afterwards). */
1906 if (sb
->s_op
->sync_fs
)
1907 sb
->s_op
->sync_fs(sb
, 1);
1908 sync_blockdev(sb
->s_bdev
);
1909 /* Now the quota files are just ordinary files and we can set the
1910 * inode flags back. Moreover we discard the pagecache so that
1911 * userspace sees the writes we did bypassing the pagecache. We
1912 * must also discard the blockdev buffers so that we see the
1913 * changes done by userspace on the next quotaon() */
1914 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1915 if (toputinode
[cnt
]) {
1916 mutex_lock(&dqopt
->dqonoff_mutex
);
1917 /* If quota was reenabled in the meantime, we have
1919 if (!sb_has_quota_loaded(sb
, cnt
)) {
1920 mutex_lock_nested(&toputinode
[cnt
]->i_mutex
, I_MUTEX_QUOTA
);
1921 toputinode
[cnt
]->i_flags
&= ~(S_IMMUTABLE
|
1922 S_NOATIME
| S_NOQUOTA
);
1923 truncate_inode_pages(&toputinode
[cnt
]->i_data
, 0);
1924 mutex_unlock(&toputinode
[cnt
]->i_mutex
);
1925 mark_inode_dirty(toputinode
[cnt
]);
1927 mutex_unlock(&dqopt
->dqonoff_mutex
);
1930 invalidate_bdev(sb
->s_bdev
);
1932 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1933 if (toputinode
[cnt
]) {
1934 /* On remount RO, we keep the inode pointer so that we
1935 * can reenable quota on the subsequent remount RW. We
1936 * have to check 'flags' variable and not use sb_has_
1937 * function because another quotaon / quotaoff could
1938 * change global state before we got here. We refuse
1939 * to suspend quotas when there is pending delete on
1940 * the quota file... */
1941 if (!(flags
& DQUOT_SUSPENDED
))
1942 iput(toputinode
[cnt
]);
1943 else if (!toputinode
[cnt
]->i_nlink
)
1948 EXPORT_SYMBOL(vfs_quota_disable
);
1950 int vfs_quota_off(struct super_block
*sb
, int type
, int remount
)
1952 return vfs_quota_disable(sb
, type
, remount
? DQUOT_SUSPENDED
:
1953 (DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
));
1955 EXPORT_SYMBOL(vfs_quota_off
);
1957 * Turn quotas on on a device
1961 * Helper function to turn quotas on when we already have the inode of
1962 * quota file and no quota information is loaded.
1964 static int vfs_load_quota_inode(struct inode
*inode
, int type
, int format_id
,
1967 struct quota_format_type
*fmt
= find_quota_format(format_id
);
1968 struct super_block
*sb
= inode
->i_sb
;
1969 struct quota_info
*dqopt
= sb_dqopt(sb
);
1975 if (!S_ISREG(inode
->i_mode
)) {
1979 if (IS_RDONLY(inode
)) {
1983 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
) {
1987 /* Usage always has to be set... */
1988 if (!(flags
& DQUOT_USAGE_ENABLED
)) {
1993 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
1994 /* As we bypass the pagecache we must now flush the inode so
1995 * that we see all the changes from userspace... */
1996 write_inode_now(inode
, 1);
1997 /* And now flush the block cache so that kernel sees the
1999 invalidate_bdev(sb
->s_bdev
);
2001 mutex_lock(&inode
->i_mutex
);
2002 mutex_lock(&dqopt
->dqonoff_mutex
);
2003 if (sb_has_quota_loaded(sb
, type
)) {
2008 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
2009 /* We don't want quota and atime on quota files (deadlocks
2010 * possible) Also nobody should write to the file - we use
2011 * special IO operations which ignore the immutable bit. */
2012 down_write(&dqopt
->dqptr_sem
);
2013 oldflags
= inode
->i_flags
& (S_NOATIME
| S_IMMUTABLE
| S_NOQUOTA
);
2014 inode
->i_flags
|= S_NOQUOTA
| S_NOATIME
| S_IMMUTABLE
;
2015 up_write(&dqopt
->dqptr_sem
);
2016 sb
->dq_op
->drop(inode
);
2020 dqopt
->files
[type
] = igrab(inode
);
2021 if (!dqopt
->files
[type
])
2024 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
2027 dqopt
->ops
[type
] = fmt
->qf_ops
;
2028 dqopt
->info
[type
].dqi_format
= fmt
;
2029 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
2030 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
2031 mutex_lock(&dqopt
->dqio_mutex
);
2032 if ((error
= dqopt
->ops
[type
]->read_file_info(sb
, type
)) < 0) {
2033 mutex_unlock(&dqopt
->dqio_mutex
);
2036 mutex_unlock(&dqopt
->dqio_mutex
);
2037 mutex_unlock(&inode
->i_mutex
);
2038 spin_lock(&dq_state_lock
);
2039 dqopt
->flags
|= dquot_state_flag(flags
, type
);
2040 spin_unlock(&dq_state_lock
);
2042 add_dquot_ref(sb
, type
);
2043 mutex_unlock(&dqopt
->dqonoff_mutex
);
2048 dqopt
->files
[type
] = NULL
;
2051 mutex_unlock(&dqopt
->dqonoff_mutex
);
2052 if (oldflags
!= -1) {
2053 down_write(&dqopt
->dqptr_sem
);
2054 /* Set the flags back (in the case of accidental quotaon()
2055 * on a wrong file we don't want to mess up the flags) */
2056 inode
->i_flags
&= ~(S_NOATIME
| S_NOQUOTA
| S_IMMUTABLE
);
2057 inode
->i_flags
|= oldflags
;
2058 up_write(&dqopt
->dqptr_sem
);
2060 mutex_unlock(&inode
->i_mutex
);
2062 put_quota_format(fmt
);
2067 /* Reenable quotas on remount RW */
2068 static int vfs_quota_on_remount(struct super_block
*sb
, int type
)
2070 struct quota_info
*dqopt
= sb_dqopt(sb
);
2071 struct inode
*inode
;
2075 mutex_lock(&dqopt
->dqonoff_mutex
);
2076 if (!sb_has_quota_suspended(sb
, type
)) {
2077 mutex_unlock(&dqopt
->dqonoff_mutex
);
2080 inode
= dqopt
->files
[type
];
2081 dqopt
->files
[type
] = NULL
;
2082 spin_lock(&dq_state_lock
);
2083 flags
= dqopt
->flags
& dquot_state_flag(DQUOT_USAGE_ENABLED
|
2084 DQUOT_LIMITS_ENABLED
, type
);
2085 dqopt
->flags
&= ~dquot_state_flag(DQUOT_STATE_FLAGS
, type
);
2086 spin_unlock(&dq_state_lock
);
2087 mutex_unlock(&dqopt
->dqonoff_mutex
);
2089 flags
= dquot_generic_flag(flags
, type
);
2090 ret
= vfs_load_quota_inode(inode
, type
, dqopt
->info
[type
].dqi_fmt_id
,
2097 int vfs_quota_on_path(struct super_block
*sb
, int type
, int format_id
,
2100 int error
= security_quota_on(path
->dentry
);
2103 /* Quota file not on the same filesystem? */
2104 if (path
->mnt
->mnt_sb
!= sb
)
2107 error
= vfs_load_quota_inode(path
->dentry
->d_inode
, type
,
2108 format_id
, DQUOT_USAGE_ENABLED
|
2109 DQUOT_LIMITS_ENABLED
);
2112 EXPORT_SYMBOL(vfs_quota_on_path
);
2114 int vfs_quota_on(struct super_block
*sb
, int type
, int format_id
, char *name
,
2121 return vfs_quota_on_remount(sb
, type
);
2123 error
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
2125 error
= vfs_quota_on_path(sb
, type
, format_id
, &path
);
2130 EXPORT_SYMBOL(vfs_quota_on
);
2133 * More powerful function for turning on quotas allowing setting
2134 * of individual quota flags
2136 int vfs_quota_enable(struct inode
*inode
, int type
, int format_id
,
2140 struct super_block
*sb
= inode
->i_sb
;
2141 struct quota_info
*dqopt
= sb_dqopt(sb
);
2143 /* Just unsuspend quotas? */
2144 if (flags
& DQUOT_SUSPENDED
)
2145 return vfs_quota_on_remount(sb
, type
);
2148 /* Just updating flags needed? */
2149 if (sb_has_quota_loaded(sb
, type
)) {
2150 mutex_lock(&dqopt
->dqonoff_mutex
);
2151 /* Now do a reliable test... */
2152 if (!sb_has_quota_loaded(sb
, type
)) {
2153 mutex_unlock(&dqopt
->dqonoff_mutex
);
2156 if (flags
& DQUOT_USAGE_ENABLED
&&
2157 sb_has_quota_usage_enabled(sb
, type
)) {
2161 if (flags
& DQUOT_LIMITS_ENABLED
&&
2162 sb_has_quota_limits_enabled(sb
, type
)) {
2166 spin_lock(&dq_state_lock
);
2167 sb_dqopt(sb
)->flags
|= dquot_state_flag(flags
, type
);
2168 spin_unlock(&dq_state_lock
);
2170 mutex_unlock(&dqopt
->dqonoff_mutex
);
2175 return vfs_load_quota_inode(inode
, type
, format_id
, flags
);
2177 EXPORT_SYMBOL(vfs_quota_enable
);
2180 * This function is used when filesystem needs to initialize quotas
2181 * during mount time.
2183 int vfs_quota_on_mount(struct super_block
*sb
, char *qf_name
,
2184 int format_id
, int type
)
2186 struct dentry
*dentry
;
2189 dentry
= lookup_one_len(qf_name
, sb
->s_root
, strlen(qf_name
));
2191 return PTR_ERR(dentry
);
2193 if (!dentry
->d_inode
) {
2198 error
= security_quota_on(dentry
);
2200 error
= vfs_load_quota_inode(dentry
->d_inode
, type
, format_id
,
2201 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
2207 EXPORT_SYMBOL(vfs_quota_on_mount
);
2209 /* Wrapper to turn on quotas when remounting rw */
2210 int vfs_dq_quota_on_remount(struct super_block
*sb
)
2215 if (!sb
->s_qcop
|| !sb
->s_qcop
->quota_on
)
2217 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2218 err
= sb
->s_qcop
->quota_on(sb
, cnt
, 0, NULL
, 1);
2219 if (err
< 0 && !ret
)
2224 EXPORT_SYMBOL(vfs_dq_quota_on_remount
);
2226 static inline qsize_t
qbtos(qsize_t blocks
)
2228 return blocks
<< QIF_DQBLKSIZE_BITS
;
2231 static inline qsize_t
stoqb(qsize_t space
)
2233 return (space
+ QIF_DQBLKSIZE
- 1) >> QIF_DQBLKSIZE_BITS
;
2236 /* Generic routine for getting common part of quota structure */
2237 static void do_get_dqblk(struct dquot
*dquot
, struct if_dqblk
*di
)
2239 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2241 spin_lock(&dq_data_lock
);
2242 di
->dqb_bhardlimit
= stoqb(dm
->dqb_bhardlimit
);
2243 di
->dqb_bsoftlimit
= stoqb(dm
->dqb_bsoftlimit
);
2244 di
->dqb_curspace
= dm
->dqb_curspace
+ dm
->dqb_rsvspace
;
2245 di
->dqb_ihardlimit
= dm
->dqb_ihardlimit
;
2246 di
->dqb_isoftlimit
= dm
->dqb_isoftlimit
;
2247 di
->dqb_curinodes
= dm
->dqb_curinodes
;
2248 di
->dqb_btime
= dm
->dqb_btime
;
2249 di
->dqb_itime
= dm
->dqb_itime
;
2250 di
->dqb_valid
= QIF_ALL
;
2251 spin_unlock(&dq_data_lock
);
2254 int vfs_get_dqblk(struct super_block
*sb
, int type
, qid_t id
, struct if_dqblk
*di
)
2256 struct dquot
*dquot
;
2258 dquot
= dqget(sb
, id
, type
);
2259 if (dquot
== NODQUOT
)
2261 do_get_dqblk(dquot
, di
);
2266 EXPORT_SYMBOL(vfs_get_dqblk
);
2268 /* Generic routine for setting common part of quota structure */
2269 static int do_set_dqblk(struct dquot
*dquot
, struct if_dqblk
*di
)
2271 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2272 int check_blim
= 0, check_ilim
= 0;
2273 struct mem_dqinfo
*dqi
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
2275 if ((di
->dqb_valid
& QIF_BLIMITS
&&
2276 (di
->dqb_bhardlimit
> dqi
->dqi_maxblimit
||
2277 di
->dqb_bsoftlimit
> dqi
->dqi_maxblimit
)) ||
2278 (di
->dqb_valid
& QIF_ILIMITS
&&
2279 (di
->dqb_ihardlimit
> dqi
->dqi_maxilimit
||
2280 di
->dqb_isoftlimit
> dqi
->dqi_maxilimit
)))
2283 spin_lock(&dq_data_lock
);
2284 if (di
->dqb_valid
& QIF_SPACE
) {
2285 dm
->dqb_curspace
= di
->dqb_curspace
- dm
->dqb_rsvspace
;
2287 __set_bit(DQ_LASTSET_B
+ QIF_SPACE_B
, &dquot
->dq_flags
);
2289 if (di
->dqb_valid
& QIF_BLIMITS
) {
2290 dm
->dqb_bsoftlimit
= qbtos(di
->dqb_bsoftlimit
);
2291 dm
->dqb_bhardlimit
= qbtos(di
->dqb_bhardlimit
);
2293 __set_bit(DQ_LASTSET_B
+ QIF_BLIMITS_B
, &dquot
->dq_flags
);
2295 if (di
->dqb_valid
& QIF_INODES
) {
2296 dm
->dqb_curinodes
= di
->dqb_curinodes
;
2298 __set_bit(DQ_LASTSET_B
+ QIF_INODES_B
, &dquot
->dq_flags
);
2300 if (di
->dqb_valid
& QIF_ILIMITS
) {
2301 dm
->dqb_isoftlimit
= di
->dqb_isoftlimit
;
2302 dm
->dqb_ihardlimit
= di
->dqb_ihardlimit
;
2304 __set_bit(DQ_LASTSET_B
+ QIF_ILIMITS_B
, &dquot
->dq_flags
);
2306 if (di
->dqb_valid
& QIF_BTIME
) {
2307 dm
->dqb_btime
= di
->dqb_btime
;
2309 __set_bit(DQ_LASTSET_B
+ QIF_BTIME_B
, &dquot
->dq_flags
);
2311 if (di
->dqb_valid
& QIF_ITIME
) {
2312 dm
->dqb_itime
= di
->dqb_itime
;
2314 __set_bit(DQ_LASTSET_B
+ QIF_ITIME_B
, &dquot
->dq_flags
);
2318 if (!dm
->dqb_bsoftlimit
|| dm
->dqb_curspace
< dm
->dqb_bsoftlimit
) {
2320 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
2322 else if (!(di
->dqb_valid
& QIF_BTIME
)) /* Set grace only if user hasn't provided his own... */
2323 dm
->dqb_btime
= get_seconds() + dqi
->dqi_bgrace
;
2326 if (!dm
->dqb_isoftlimit
|| dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
2328 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
2330 else if (!(di
->dqb_valid
& QIF_ITIME
)) /* Set grace only if user hasn't provided his own... */
2331 dm
->dqb_itime
= get_seconds() + dqi
->dqi_igrace
;
2333 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
|| dm
->dqb_isoftlimit
)
2334 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2336 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2337 spin_unlock(&dq_data_lock
);
2338 mark_dquot_dirty(dquot
);
2343 int vfs_set_dqblk(struct super_block
*sb
, int type
, qid_t id
, struct if_dqblk
*di
)
2345 struct dquot
*dquot
;
2348 dquot
= dqget(sb
, id
, type
);
2353 rc
= do_set_dqblk(dquot
, di
);
2358 EXPORT_SYMBOL(vfs_set_dqblk
);
2360 /* Generic routine for getting common part of quota file information */
2361 int vfs_get_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2363 struct mem_dqinfo
*mi
;
2365 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2366 if (!sb_has_quota_active(sb
, type
)) {
2367 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2370 mi
= sb_dqopt(sb
)->info
+ type
;
2371 spin_lock(&dq_data_lock
);
2372 ii
->dqi_bgrace
= mi
->dqi_bgrace
;
2373 ii
->dqi_igrace
= mi
->dqi_igrace
;
2374 ii
->dqi_flags
= mi
->dqi_flags
& DQF_MASK
;
2375 ii
->dqi_valid
= IIF_ALL
;
2376 spin_unlock(&dq_data_lock
);
2377 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2380 EXPORT_SYMBOL(vfs_get_dqinfo
);
2382 /* Generic routine for setting common part of quota file information */
2383 int vfs_set_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2385 struct mem_dqinfo
*mi
;
2388 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2389 if (!sb_has_quota_active(sb
, type
)) {
2393 mi
= sb_dqopt(sb
)->info
+ type
;
2394 spin_lock(&dq_data_lock
);
2395 if (ii
->dqi_valid
& IIF_BGRACE
)
2396 mi
->dqi_bgrace
= ii
->dqi_bgrace
;
2397 if (ii
->dqi_valid
& IIF_IGRACE
)
2398 mi
->dqi_igrace
= ii
->dqi_igrace
;
2399 if (ii
->dqi_valid
& IIF_FLAGS
)
2400 mi
->dqi_flags
= (mi
->dqi_flags
& ~DQF_MASK
) | (ii
->dqi_flags
& DQF_MASK
);
2401 spin_unlock(&dq_data_lock
);
2402 mark_info_dirty(sb
, type
);
2403 /* Force write to disk */
2404 sb
->dq_op
->write_info(sb
, type
);
2406 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2409 EXPORT_SYMBOL(vfs_set_dqinfo
);
2411 struct quotactl_ops vfs_quotactl_ops
= {
2412 .quota_on
= vfs_quota_on
,
2413 .quota_off
= vfs_quota_off
,
2414 .quota_sync
= vfs_quota_sync
,
2415 .get_info
= vfs_get_dqinfo
,
2416 .set_info
= vfs_set_dqinfo
,
2417 .get_dqblk
= vfs_get_dqblk
,
2418 .set_dqblk
= vfs_set_dqblk
2421 static ctl_table fs_dqstats_table
[] = {
2423 .ctl_name
= FS_DQ_LOOKUPS
,
2424 .procname
= "lookups",
2425 .data
= &dqstats
.lookups
,
2426 .maxlen
= sizeof(int),
2428 .proc_handler
= &proc_dointvec
,
2431 .ctl_name
= FS_DQ_DROPS
,
2432 .procname
= "drops",
2433 .data
= &dqstats
.drops
,
2434 .maxlen
= sizeof(int),
2436 .proc_handler
= &proc_dointvec
,
2439 .ctl_name
= FS_DQ_READS
,
2440 .procname
= "reads",
2441 .data
= &dqstats
.reads
,
2442 .maxlen
= sizeof(int),
2444 .proc_handler
= &proc_dointvec
,
2447 .ctl_name
= FS_DQ_WRITES
,
2448 .procname
= "writes",
2449 .data
= &dqstats
.writes
,
2450 .maxlen
= sizeof(int),
2452 .proc_handler
= &proc_dointvec
,
2455 .ctl_name
= FS_DQ_CACHE_HITS
,
2456 .procname
= "cache_hits",
2457 .data
= &dqstats
.cache_hits
,
2458 .maxlen
= sizeof(int),
2460 .proc_handler
= &proc_dointvec
,
2463 .ctl_name
= FS_DQ_ALLOCATED
,
2464 .procname
= "allocated_dquots",
2465 .data
= &dqstats
.allocated_dquots
,
2466 .maxlen
= sizeof(int),
2468 .proc_handler
= &proc_dointvec
,
2471 .ctl_name
= FS_DQ_FREE
,
2472 .procname
= "free_dquots",
2473 .data
= &dqstats
.free_dquots
,
2474 .maxlen
= sizeof(int),
2476 .proc_handler
= &proc_dointvec
,
2479 .ctl_name
= FS_DQ_SYNCS
,
2480 .procname
= "syncs",
2481 .data
= &dqstats
.syncs
,
2482 .maxlen
= sizeof(int),
2484 .proc_handler
= &proc_dointvec
,
2486 #ifdef CONFIG_PRINT_QUOTA_WARNING
2488 .ctl_name
= FS_DQ_WARNINGS
,
2489 .procname
= "warnings",
2490 .data
= &flag_print_warnings
,
2491 .maxlen
= sizeof(int),
2493 .proc_handler
= &proc_dointvec
,
2499 static ctl_table fs_table
[] = {
2501 .ctl_name
= FS_DQSTATS
,
2502 .procname
= "quota",
2504 .child
= fs_dqstats_table
,
2509 static ctl_table sys_table
[] = {
2519 static int __init
dquot_init(void)
2522 unsigned long nr_hash
, order
;
2524 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2526 register_sysctl_table(sys_table
);
2528 dquot_cachep
= kmem_cache_create("dquot",
2529 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2530 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2531 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2535 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
2537 panic("Cannot create dquot hash table");
2539 /* Find power-of-two hlist_heads which can fit into allocation */
2540 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2544 } while (nr_hash
>> dq_hash_bits
);
2547 nr_hash
= 1UL << dq_hash_bits
;
2548 dq_hash_mask
= nr_hash
- 1;
2549 for (i
= 0; i
< nr_hash
; i
++)
2550 INIT_HLIST_HEAD(dquot_hash
+ i
);
2552 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2553 nr_hash
, order
, (PAGE_SIZE
<< order
));
2555 register_shrinker(&dqcache_shrinker
);
2557 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
2558 if (genl_register_family("a_genl_family
) != 0)
2559 printk(KERN_ERR
"VFS: Failed to create quota netlink interface.\n");
2564 module_init(dquot_init
);