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 * Version: $Id: dquot.c,v 6.3 1996/11/17 18:35:34 mvw Exp mvw $
14 * Author: Marco van Wieringen <mvw@planets.elm.net>
16 * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
18 * Revised list management to avoid races
19 * -- Bill Hawes, <whawes@star.net>, 9/98
21 * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
22 * As the consequence the locking was moved from dquot_decr_...(),
23 * dquot_incr_...() to calling functions.
24 * invalidate_dquots() now writes modified dquots.
25 * Serialized quota_off() and quota_on() for mount point.
26 * Fixed a few bugs in grow_dquots().
27 * Fixed deadlock in write_dquot() - we no longer account quotas on
29 * remove_dquot_ref() moved to inode.c - it now traverses through inodes
30 * add_dquot_ref() restarts after blocking
31 * Added check for bogus uid and fixed check for group in quotactl.
32 * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
34 * Used struct list_head instead of own list struct
35 * Invalidation of referenced dquots is no longer possible
36 * Improved free_dquots list management
37 * Quota and i_blocks are now updated in one place to avoid races
38 * Warnings are now delayed so we won't block in critical section
39 * Write updated not to require dquot lock
40 * Jan Kara, <jack@suse.cz>, 9/2000
42 * Added dynamic quota structure allocation
43 * Jan Kara <jack@suse.cz> 12/2000
45 * Rewritten quota interface. Implemented new quota format and
46 * formats registering.
47 * Jan Kara, <jack@suse.cz>, 2001,2002
50 * Jan Kara, <jack@suse.cz>, 10/2002
52 * Added journalled quota support, fix lock inversion problems
53 * Jan Kara, <jack@suse.cz>, 2003,2004
55 * (C) Copyright 1994 - 1997 Marco van Wieringen
58 #include <linux/errno.h>
59 #include <linux/kernel.h>
61 #include <linux/mount.h>
63 #include <linux/time.h>
64 #include <linux/types.h>
65 #include <linux/string.h>
66 #include <linux/fcntl.h>
67 #include <linux/stat.h>
68 #include <linux/tty.h>
69 #include <linux/file.h>
70 #include <linux/slab.h>
71 #include <linux/sysctl.h>
72 #include <linux/init.h>
73 #include <linux/module.h>
74 #include <linux/proc_fs.h>
75 #include <linux/security.h>
76 #include <linux/kmod.h>
77 #include <linux/namei.h>
78 #include <linux/buffer_head.h>
79 #include <linux/capability.h>
80 #include <linux/quotaops.h>
81 #include <linux/writeback.h> /* for inode_lock, oddly enough.. */
82 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
83 #include <net/netlink.h>
84 #include <net/genetlink.h>
87 #include <asm/uaccess.h>
89 #define __DQUOT_PARANOIA
92 * There are two quota SMP locks. dq_list_lock protects all lists with quotas
93 * and quota formats and also dqstats structure containing statistics about the
94 * lists. dq_data_lock protects data from dq_dqb and also mem_dqinfo structures
95 * and also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
96 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
97 * in inode_add_bytes() and inode_sub_bytes().
99 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock
101 * Note that some things (eg. sb pointer, type, id) doesn't change during
102 * the life of the dquot structure and so needn't to be protected by a lock
104 * Any operation working on dquots via inode pointers must hold dqptr_sem. If
105 * operation is just reading pointers from inode (or not using them at all) the
106 * read lock is enough. If pointers are altered function must hold write lock
107 * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
108 * for altering the flag i_mutex is also needed). If operation is holding
109 * reference to dquot in other way (e.g. quotactl ops) it must be guarded by
111 * This locking assures that:
112 * a) update/access to dquot pointers in inode is serialized
113 * b) everyone is guarded against invalidate_dquots()
115 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
116 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
117 * Currently dquot is locked only when it is being read to memory (or space for
118 * it is being allocated) on the first dqget() and when it is being released on
119 * the last dqput(). The allocation and release oparations are serialized by
120 * the dq_lock and by checking the use count in dquot_release(). Write
121 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
122 * spinlock to internal buffers before writing.
124 * Lock ordering (including related VFS locks) is the following:
125 * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
127 * i_mutex on quota files is special (it's below dqio_mutex)
130 static DEFINE_SPINLOCK(dq_list_lock
);
131 DEFINE_SPINLOCK(dq_data_lock
);
133 static char *quotatypes
[] = INITQFNAMES
;
134 static struct quota_format_type
*quota_formats
; /* List of registered formats */
135 static struct quota_module_name module_names
[] = INIT_QUOTA_MODULE_NAMES
;
137 /* SLAB cache for dquot structures */
138 static struct kmem_cache
*dquot_cachep
;
140 int register_quota_format(struct quota_format_type
*fmt
)
142 spin_lock(&dq_list_lock
);
143 fmt
->qf_next
= quota_formats
;
145 spin_unlock(&dq_list_lock
);
149 void unregister_quota_format(struct quota_format_type
*fmt
)
151 struct quota_format_type
**actqf
;
153 spin_lock(&dq_list_lock
);
154 for (actqf
= "a_formats
; *actqf
&& *actqf
!= fmt
; actqf
= &(*actqf
)->qf_next
);
156 *actqf
= (*actqf
)->qf_next
;
157 spin_unlock(&dq_list_lock
);
160 static struct quota_format_type
*find_quota_format(int id
)
162 struct quota_format_type
*actqf
;
164 spin_lock(&dq_list_lock
);
165 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
; actqf
= actqf
->qf_next
);
166 if (!actqf
|| !try_module_get(actqf
->qf_owner
)) {
169 spin_unlock(&dq_list_lock
);
171 for (qm
= 0; module_names
[qm
].qm_fmt_id
&& module_names
[qm
].qm_fmt_id
!= id
; qm
++);
172 if (!module_names
[qm
].qm_fmt_id
|| request_module(module_names
[qm
].qm_mod_name
))
175 spin_lock(&dq_list_lock
);
176 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
; actqf
= actqf
->qf_next
);
177 if (actqf
&& !try_module_get(actqf
->qf_owner
))
180 spin_unlock(&dq_list_lock
);
184 static void put_quota_format(struct quota_format_type
*fmt
)
186 module_put(fmt
->qf_owner
);
190 * Dquot List Management:
191 * The quota code uses three lists for dquot management: the inuse_list,
192 * free_dquots, and dquot_hash[] array. A single dquot structure may be
193 * on all three lists, depending on its current state.
195 * All dquots are placed to the end of inuse_list when first created, and this
196 * list is used for invalidate operation, which must look at every dquot.
198 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
199 * and this list is searched whenever we need an available dquot. Dquots are
200 * removed from the list as soon as they are used again, and
201 * dqstats.free_dquots gives the number of dquots on the list. When
202 * dquot is invalidated it's completely released from memory.
204 * Dquots with a specific identity (device, type and id) are placed on
205 * one of the dquot_hash[] hash chains. The provides an efficient search
206 * mechanism to locate a specific dquot.
209 static LIST_HEAD(inuse_list
);
210 static LIST_HEAD(free_dquots
);
211 static unsigned int dq_hash_bits
, dq_hash_mask
;
212 static struct hlist_head
*dquot_hash
;
214 struct dqstats dqstats
;
216 static void dqput(struct dquot
*dquot
);
218 static inline unsigned int
219 hashfn(const struct super_block
*sb
, unsigned int id
, int type
)
223 tmp
= (((unsigned long)sb
>>L1_CACHE_SHIFT
) ^ id
) * (MAXQUOTAS
- type
);
224 return (tmp
+ (tmp
>> dq_hash_bits
)) & dq_hash_mask
;
228 * Following list functions expect dq_list_lock to be held
230 static inline void insert_dquot_hash(struct dquot
*dquot
)
232 struct hlist_head
*head
= dquot_hash
+ hashfn(dquot
->dq_sb
, dquot
->dq_id
, dquot
->dq_type
);
233 hlist_add_head(&dquot
->dq_hash
, head
);
236 static inline void remove_dquot_hash(struct dquot
*dquot
)
238 hlist_del_init(&dquot
->dq_hash
);
241 static inline struct dquot
*find_dquot(unsigned int hashent
, struct super_block
*sb
, unsigned int id
, int type
)
243 struct hlist_node
*node
;
246 hlist_for_each (node
, dquot_hash
+hashent
) {
247 dquot
= hlist_entry(node
, struct dquot
, dq_hash
);
248 if (dquot
->dq_sb
== sb
&& dquot
->dq_id
== id
&& dquot
->dq_type
== type
)
254 /* Add a dquot to the tail of the free list */
255 static inline void put_dquot_last(struct dquot
*dquot
)
257 list_add_tail(&dquot
->dq_free
, &free_dquots
);
258 dqstats
.free_dquots
++;
261 static inline void remove_free_dquot(struct dquot
*dquot
)
263 if (list_empty(&dquot
->dq_free
))
265 list_del_init(&dquot
->dq_free
);
266 dqstats
.free_dquots
--;
269 static inline void put_inuse(struct dquot
*dquot
)
271 /* We add to the back of inuse list so we don't have to restart
272 * when traversing this list and we block */
273 list_add_tail(&dquot
->dq_inuse
, &inuse_list
);
274 dqstats
.allocated_dquots
++;
277 static inline void remove_inuse(struct dquot
*dquot
)
279 dqstats
.allocated_dquots
--;
280 list_del(&dquot
->dq_inuse
);
283 * End of list functions needing dq_list_lock
286 static void wait_on_dquot(struct dquot
*dquot
)
288 mutex_lock(&dquot
->dq_lock
);
289 mutex_unlock(&dquot
->dq_lock
);
292 static inline int dquot_dirty(struct dquot
*dquot
)
294 return test_bit(DQ_MOD_B
, &dquot
->dq_flags
);
297 static inline int mark_dquot_dirty(struct dquot
*dquot
)
299 return dquot
->dq_sb
->dq_op
->mark_dirty(dquot
);
302 int dquot_mark_dquot_dirty(struct dquot
*dquot
)
304 spin_lock(&dq_list_lock
);
305 if (!test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
))
306 list_add(&dquot
->dq_dirty
, &sb_dqopt(dquot
->dq_sb
)->
307 info
[dquot
->dq_type
].dqi_dirty_list
);
308 spin_unlock(&dq_list_lock
);
312 /* This function needs dq_list_lock */
313 static inline int clear_dquot_dirty(struct dquot
*dquot
)
315 if (!test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
))
317 list_del_init(&dquot
->dq_dirty
);
321 void mark_info_dirty(struct super_block
*sb
, int type
)
323 set_bit(DQF_INFO_DIRTY_B
, &sb_dqopt(sb
)->info
[type
].dqi_flags
);
325 EXPORT_SYMBOL(mark_info_dirty
);
328 * Read dquot from disk and alloc space for it
331 int dquot_acquire(struct dquot
*dquot
)
333 int ret
= 0, ret2
= 0;
334 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
336 mutex_lock(&dquot
->dq_lock
);
337 mutex_lock(&dqopt
->dqio_mutex
);
338 if (!test_bit(DQ_READ_B
, &dquot
->dq_flags
))
339 ret
= dqopt
->ops
[dquot
->dq_type
]->read_dqblk(dquot
);
342 set_bit(DQ_READ_B
, &dquot
->dq_flags
);
343 /* Instantiate dquot if needed */
344 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && !dquot
->dq_off
) {
345 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
346 /* Write the info if needed */
347 if (info_dirty(&dqopt
->info
[dquot
->dq_type
]))
348 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(dquot
->dq_sb
, dquot
->dq_type
);
356 set_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
358 mutex_unlock(&dqopt
->dqio_mutex
);
359 mutex_unlock(&dquot
->dq_lock
);
364 * Write dquot to disk
366 int dquot_commit(struct dquot
*dquot
)
368 int ret
= 0, ret2
= 0;
369 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
371 mutex_lock(&dqopt
->dqio_mutex
);
372 spin_lock(&dq_list_lock
);
373 if (!clear_dquot_dirty(dquot
)) {
374 spin_unlock(&dq_list_lock
);
377 spin_unlock(&dq_list_lock
);
378 /* Inactive dquot can be only if there was error during read/init
379 * => we have better not writing it */
380 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
381 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
382 if (info_dirty(&dqopt
->info
[dquot
->dq_type
]))
383 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(dquot
->dq_sb
, dquot
->dq_type
);
388 mutex_unlock(&dqopt
->dqio_mutex
);
395 int dquot_release(struct dquot
*dquot
)
397 int ret
= 0, ret2
= 0;
398 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
400 mutex_lock(&dquot
->dq_lock
);
401 /* Check whether we are not racing with some other dqget() */
402 if (atomic_read(&dquot
->dq_count
) > 1)
404 mutex_lock(&dqopt
->dqio_mutex
);
405 if (dqopt
->ops
[dquot
->dq_type
]->release_dqblk
) {
406 ret
= dqopt
->ops
[dquot
->dq_type
]->release_dqblk(dquot
);
408 if (info_dirty(&dqopt
->info
[dquot
->dq_type
]))
409 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(dquot
->dq_sb
, dquot
->dq_type
);
413 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
414 mutex_unlock(&dqopt
->dqio_mutex
);
416 mutex_unlock(&dquot
->dq_lock
);
420 /* Invalidate all dquots on the list. Note that this function is called after
421 * quota is disabled and pointers from inodes removed so there cannot be new
422 * quota users. There can still be some users of quotas due to inodes being
423 * just deleted or pruned by prune_icache() (those are not attached to any
424 * list). We have to wait for such users.
426 static void invalidate_dquots(struct super_block
*sb
, int type
)
428 struct dquot
*dquot
, *tmp
;
431 spin_lock(&dq_list_lock
);
432 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
433 if (dquot
->dq_sb
!= sb
)
435 if (dquot
->dq_type
!= type
)
437 /* Wait for dquot users */
438 if (atomic_read(&dquot
->dq_count
)) {
441 atomic_inc(&dquot
->dq_count
);
442 prepare_to_wait(&dquot
->dq_wait_unused
, &wait
,
443 TASK_UNINTERRUPTIBLE
);
444 spin_unlock(&dq_list_lock
);
445 /* Once dqput() wakes us up, we know it's time to free
447 * IMPORTANT: we rely on the fact that there is always
448 * at most one process waiting for dquot to free.
449 * Otherwise dq_count would be > 1 and we would never
452 if (atomic_read(&dquot
->dq_count
) > 1)
454 finish_wait(&dquot
->dq_wait_unused
, &wait
);
456 /* At this moment dquot() need not exist (it could be
457 * reclaimed by prune_dqcache(). Hence we must
462 * Quota now has no users and it has been written on last
465 remove_dquot_hash(dquot
);
466 remove_free_dquot(dquot
);
468 kmem_cache_free(dquot_cachep
, dquot
);
470 spin_unlock(&dq_list_lock
);
473 int vfs_quota_sync(struct super_block
*sb
, int type
)
475 struct list_head
*dirty
;
477 struct quota_info
*dqopt
= sb_dqopt(sb
);
480 mutex_lock(&dqopt
->dqonoff_mutex
);
481 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
482 if (type
!= -1 && cnt
!= type
)
484 if (!sb_has_quota_enabled(sb
, cnt
))
486 spin_lock(&dq_list_lock
);
487 dirty
= &dqopt
->info
[cnt
].dqi_dirty_list
;
488 while (!list_empty(dirty
)) {
489 dquot
= list_first_entry(dirty
, struct dquot
, dq_dirty
);
490 /* Dirty and inactive can be only bad dquot... */
491 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
492 clear_dquot_dirty(dquot
);
495 /* Now we have active dquot from which someone is
496 * holding reference so we can safely just increase
498 atomic_inc(&dquot
->dq_count
);
500 spin_unlock(&dq_list_lock
);
501 sb
->dq_op
->write_dquot(dquot
);
503 spin_lock(&dq_list_lock
);
505 spin_unlock(&dq_list_lock
);
508 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
509 if ((cnt
== type
|| type
== -1) && sb_has_quota_enabled(sb
, cnt
)
510 && info_dirty(&dqopt
->info
[cnt
]))
511 sb
->dq_op
->write_info(sb
, cnt
);
512 spin_lock(&dq_list_lock
);
514 spin_unlock(&dq_list_lock
);
515 mutex_unlock(&dqopt
->dqonoff_mutex
);
520 /* Free unused dquots from cache */
521 static void prune_dqcache(int count
)
523 struct list_head
*head
;
526 head
= free_dquots
.prev
;
527 while (head
!= &free_dquots
&& count
) {
528 dquot
= list_entry(head
, struct dquot
, dq_free
);
529 remove_dquot_hash(dquot
);
530 remove_free_dquot(dquot
);
532 kmem_cache_free(dquot_cachep
, dquot
);
534 head
= free_dquots
.prev
;
539 * This is called from kswapd when we think we need some
543 static int shrink_dqcache_memory(int nr
, gfp_t gfp_mask
)
546 spin_lock(&dq_list_lock
);
548 spin_unlock(&dq_list_lock
);
550 return (dqstats
.free_dquots
/ 100) * sysctl_vfs_cache_pressure
;
553 static struct shrinker dqcache_shrinker
= {
554 .shrink
= shrink_dqcache_memory
,
555 .seeks
= DEFAULT_SEEKS
,
559 * Put reference to dquot
560 * NOTE: If you change this function please check whether dqput_blocks() works right...
561 * MUST be called with either dqptr_sem or dqonoff_mutex held
563 static void dqput(struct dquot
*dquot
)
569 #ifdef __DQUOT_PARANOIA
570 if (!atomic_read(&dquot
->dq_count
)) {
571 printk("VFS: dqput: trying to free free dquot\n");
572 printk("VFS: device %s, dquot of %s %d\n",
574 quotatypes
[dquot
->dq_type
],
580 spin_lock(&dq_list_lock
);
582 spin_unlock(&dq_list_lock
);
584 spin_lock(&dq_list_lock
);
585 if (atomic_read(&dquot
->dq_count
) > 1) {
586 /* We have more than one user... nothing to do */
587 atomic_dec(&dquot
->dq_count
);
588 /* Releasing dquot during quotaoff phase? */
589 if (!sb_has_quota_enabled(dquot
->dq_sb
, dquot
->dq_type
) &&
590 atomic_read(&dquot
->dq_count
) == 1)
591 wake_up(&dquot
->dq_wait_unused
);
592 spin_unlock(&dq_list_lock
);
595 /* Need to release dquot? */
596 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && dquot_dirty(dquot
)) {
597 spin_unlock(&dq_list_lock
);
598 /* Commit dquot before releasing */
599 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
601 printk(KERN_ERR
"VFS: cannot write quota structure on "
602 "device %s (error %d). Quota may get out of "
603 "sync!\n", dquot
->dq_sb
->s_id
, ret
);
605 * We clear dirty bit anyway, so that we avoid
608 spin_lock(&dq_list_lock
);
609 clear_dquot_dirty(dquot
);
610 spin_unlock(&dq_list_lock
);
614 /* Clear flag in case dquot was inactive (something bad happened) */
615 clear_dquot_dirty(dquot
);
616 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
617 spin_unlock(&dq_list_lock
);
618 dquot
->dq_sb
->dq_op
->release_dquot(dquot
);
621 atomic_dec(&dquot
->dq_count
);
622 #ifdef __DQUOT_PARANOIA
624 BUG_ON(!list_empty(&dquot
->dq_free
));
626 put_dquot_last(dquot
);
627 spin_unlock(&dq_list_lock
);
630 static struct dquot
*get_empty_dquot(struct super_block
*sb
, int type
)
634 dquot
= kmem_cache_zalloc(dquot_cachep
, GFP_NOFS
);
638 mutex_init(&dquot
->dq_lock
);
639 INIT_LIST_HEAD(&dquot
->dq_free
);
640 INIT_LIST_HEAD(&dquot
->dq_inuse
);
641 INIT_HLIST_NODE(&dquot
->dq_hash
);
642 INIT_LIST_HEAD(&dquot
->dq_dirty
);
643 init_waitqueue_head(&dquot
->dq_wait_unused
);
645 dquot
->dq_type
= type
;
646 atomic_set(&dquot
->dq_count
, 1);
652 * Get reference to dquot
653 * MUST be called with either dqptr_sem or dqonoff_mutex held
655 static struct dquot
*dqget(struct super_block
*sb
, unsigned int id
, int type
)
657 unsigned int hashent
= hashfn(sb
, id
, type
);
658 struct dquot
*dquot
, *empty
= NODQUOT
;
660 if (!sb_has_quota_enabled(sb
, type
))
663 spin_lock(&dq_list_lock
);
664 if ((dquot
= find_dquot(hashent
, sb
, id
, type
)) == NODQUOT
) {
665 if (empty
== NODQUOT
) {
666 spin_unlock(&dq_list_lock
);
667 if ((empty
= get_empty_dquot(sb
, type
)) == NODQUOT
)
668 schedule(); /* Try to wait for a moment... */
673 /* all dquots go on the inuse_list */
675 /* hash it first so it can be found */
676 insert_dquot_hash(dquot
);
678 spin_unlock(&dq_list_lock
);
680 if (!atomic_read(&dquot
->dq_count
))
681 remove_free_dquot(dquot
);
682 atomic_inc(&dquot
->dq_count
);
683 dqstats
.cache_hits
++;
685 spin_unlock(&dq_list_lock
);
687 kmem_cache_free(dquot_cachep
, empty
);
689 /* Wait for dq_lock - after this we know that either dquot_release() is already
690 * finished or it will be canceled due to dq_count > 1 test */
691 wait_on_dquot(dquot
);
692 /* Read the dquot and instantiate it (everything done only if needed) */
693 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && sb
->dq_op
->acquire_dquot(dquot
) < 0) {
697 #ifdef __DQUOT_PARANOIA
698 BUG_ON(!dquot
->dq_sb
); /* Has somebody invalidated entry under us? */
704 static int dqinit_needed(struct inode
*inode
, int type
)
708 if (IS_NOQUOTA(inode
))
711 return inode
->i_dquot
[type
] == NODQUOT
;
712 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
713 if (inode
->i_dquot
[cnt
] == NODQUOT
)
718 /* This routine is guarded by dqonoff_mutex mutex */
719 static void add_dquot_ref(struct super_block
*sb
, int type
)
721 struct inode
*inode
, *old_inode
= NULL
;
723 spin_lock(&inode_lock
);
724 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
725 if (!atomic_read(&inode
->i_writecount
))
727 if (!dqinit_needed(inode
, type
))
729 if (inode
->i_state
& (I_FREEING
|I_WILL_FREE
))
733 spin_unlock(&inode_lock
);
736 sb
->dq_op
->initialize(inode
, type
);
737 /* We hold a reference to 'inode' so it couldn't have been
738 * removed from s_inodes list while we dropped the inode_lock.
739 * We cannot iput the inode now as we can be holding the last
740 * reference and we cannot iput it under inode_lock. So we
741 * keep the reference and iput it later. */
743 spin_lock(&inode_lock
);
745 spin_unlock(&inode_lock
);
749 /* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */
750 static inline int dqput_blocks(struct dquot
*dquot
)
752 if (atomic_read(&dquot
->dq_count
) <= 1)
757 /* Remove references to dquots from inode - add dquot to list for freeing if needed */
758 /* We can't race with anybody because we hold dqptr_sem for writing... */
759 static int remove_inode_dquot_ref(struct inode
*inode
, int type
,
760 struct list_head
*tofree_head
)
762 struct dquot
*dquot
= inode
->i_dquot
[type
];
764 inode
->i_dquot
[type
] = NODQUOT
;
765 if (dquot
!= NODQUOT
) {
766 if (dqput_blocks(dquot
)) {
767 #ifdef __DQUOT_PARANOIA
768 if (atomic_read(&dquot
->dq_count
) != 1)
769 printk(KERN_WARNING
"VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot
->dq_count
));
771 spin_lock(&dq_list_lock
);
772 list_add(&dquot
->dq_free
, tofree_head
); /* As dquot must have currently users it can't be on the free list... */
773 spin_unlock(&dq_list_lock
);
777 dqput(dquot
); /* We have guaranteed we won't block */
782 /* Free list of dquots - called from inode.c */
783 /* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */
784 static void put_dquot_list(struct list_head
*tofree_head
)
786 struct list_head
*act_head
;
789 act_head
= tofree_head
->next
;
790 /* So now we have dquots on the list... Just free them */
791 while (act_head
!= tofree_head
) {
792 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
793 act_head
= act_head
->next
;
794 list_del_init(&dquot
->dq_free
); /* Remove dquot from the list so we won't have problems... */
799 static void remove_dquot_ref(struct super_block
*sb
, int type
,
800 struct list_head
*tofree_head
)
804 spin_lock(&inode_lock
);
805 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
806 if (!IS_NOQUOTA(inode
))
807 remove_inode_dquot_ref(inode
, type
, tofree_head
);
809 spin_unlock(&inode_lock
);
812 /* Gather all references from inodes and drop them */
813 static void drop_dquot_ref(struct super_block
*sb
, int type
)
815 LIST_HEAD(tofree_head
);
818 down_write(&sb_dqopt(sb
)->dqptr_sem
);
819 remove_dquot_ref(sb
, type
, &tofree_head
);
820 up_write(&sb_dqopt(sb
)->dqptr_sem
);
821 put_dquot_list(&tofree_head
);
825 static inline void dquot_incr_inodes(struct dquot
*dquot
, unsigned long number
)
827 dquot
->dq_dqb
.dqb_curinodes
+= number
;
830 static inline void dquot_incr_space(struct dquot
*dquot
, qsize_t number
)
832 dquot
->dq_dqb
.dqb_curspace
+= number
;
835 static inline void dquot_decr_inodes(struct dquot
*dquot
, unsigned long number
)
837 if (dquot
->dq_dqb
.dqb_curinodes
> number
)
838 dquot
->dq_dqb
.dqb_curinodes
-= number
;
840 dquot
->dq_dqb
.dqb_curinodes
= 0;
841 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
842 dquot
->dq_dqb
.dqb_itime
= (time_t) 0;
843 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
846 static inline void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
848 if (dquot
->dq_dqb
.dqb_curspace
> number
)
849 dquot
->dq_dqb
.dqb_curspace
-= number
;
851 dquot
->dq_dqb
.dqb_curspace
= 0;
852 if (toqb(dquot
->dq_dqb
.dqb_curspace
) <= dquot
->dq_dqb
.dqb_bsoftlimit
)
853 dquot
->dq_dqb
.dqb_btime
= (time_t) 0;
854 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
857 static int warning_issued(struct dquot
*dquot
, const int warntype
)
859 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
860 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
861 ((warntype
== QUOTA_NL_IHARDWARN
||
862 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
866 return test_and_set_bit(flag
, &dquot
->dq_flags
);
869 #ifdef CONFIG_PRINT_QUOTA_WARNING
870 static int flag_print_warnings
= 1;
872 static inline int need_print_warning(struct dquot
*dquot
)
874 if (!flag_print_warnings
)
877 switch (dquot
->dq_type
) {
879 return current
->fsuid
== dquot
->dq_id
;
881 return in_group_p(dquot
->dq_id
);
886 /* Print warning to user which exceeded quota */
887 static void print_warning(struct dquot
*dquot
, const int warntype
)
890 struct tty_struct
*tty
;
892 if (!need_print_warning(dquot
))
895 mutex_lock(&tty_mutex
);
896 tty
= get_current_tty();
899 tty_write_message(tty
, dquot
->dq_sb
->s_id
);
900 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
901 tty_write_message(tty
, ": warning, ");
903 tty_write_message(tty
, ": write failed, ");
904 tty_write_message(tty
, quotatypes
[dquot
->dq_type
]);
906 case QUOTA_NL_IHARDWARN
:
907 msg
= " file limit reached.\r\n";
909 case QUOTA_NL_ISOFTLONGWARN
:
910 msg
= " file quota exceeded too long.\r\n";
912 case QUOTA_NL_ISOFTWARN
:
913 msg
= " file quota exceeded.\r\n";
915 case QUOTA_NL_BHARDWARN
:
916 msg
= " block limit reached.\r\n";
918 case QUOTA_NL_BSOFTLONGWARN
:
919 msg
= " block quota exceeded too long.\r\n";
921 case QUOTA_NL_BSOFTWARN
:
922 msg
= " block quota exceeded.\r\n";
925 tty_write_message(tty
, msg
);
927 mutex_unlock(&tty_mutex
);
931 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
933 /* Netlink family structure for quota */
934 static struct genl_family quota_genl_family
= {
935 .id
= GENL_ID_GENERATE
,
939 .maxattr
= QUOTA_NL_A_MAX
,
942 /* Send warning to userspace about user which exceeded quota */
943 static void send_warning(const struct dquot
*dquot
, const char warntype
)
949 int msg_size
= 4 * nla_total_size(sizeof(u32
)) +
950 2 * nla_total_size(sizeof(u64
));
952 /* We have to allocate using GFP_NOFS as we are called from a
953 * filesystem performing write and thus further recursion into
954 * the fs to free some data could cause deadlocks. */
955 skb
= genlmsg_new(msg_size
, GFP_NOFS
);
958 "VFS: Not enough memory to send quota warning.\n");
961 msg_head
= genlmsg_put(skb
, 0, atomic_add_return(1, &seq
),
962 "a_genl_family
, 0, QUOTA_NL_C_WARNING
);
965 "VFS: Cannot store netlink header in quota warning.\n");
968 ret
= nla_put_u32(skb
, QUOTA_NL_A_QTYPE
, dquot
->dq_type
);
971 ret
= nla_put_u64(skb
, QUOTA_NL_A_EXCESS_ID
, dquot
->dq_id
);
974 ret
= nla_put_u32(skb
, QUOTA_NL_A_WARNING
, warntype
);
977 ret
= nla_put_u32(skb
, QUOTA_NL_A_DEV_MAJOR
,
978 MAJOR(dquot
->dq_sb
->s_dev
));
981 ret
= nla_put_u32(skb
, QUOTA_NL_A_DEV_MINOR
,
982 MINOR(dquot
->dq_sb
->s_dev
));
985 ret
= nla_put_u64(skb
, QUOTA_NL_A_CAUSED_ID
, current
->user
->uid
);
988 genlmsg_end(skb
, msg_head
);
990 ret
= genlmsg_multicast(skb
, 0, quota_genl_family
.id
, GFP_NOFS
);
991 if (ret
< 0 && ret
!= -ESRCH
)
993 "VFS: Failed to send notification message: %d\n", ret
);
996 printk(KERN_ERR
"VFS: Not enough space to compose quota message!\n");
1002 static inline void flush_warnings(struct dquot
* const *dquots
, char *warntype
)
1006 for (i
= 0; i
< MAXQUOTAS
; i
++)
1007 if (dquots
[i
] != NODQUOT
&& warntype
[i
] != QUOTA_NL_NOWARN
&&
1008 !warning_issued(dquots
[i
], warntype
[i
])) {
1009 #ifdef CONFIG_PRINT_QUOTA_WARNING
1010 print_warning(dquots
[i
], warntype
[i
]);
1012 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
1013 send_warning(dquots
[i
], warntype
[i
]);
1018 static inline char ignore_hardlimit(struct dquot
*dquot
)
1020 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
1022 return capable(CAP_SYS_RESOURCE
) &&
1023 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
|| !(info
->dqi_flags
& V1_DQF_RSQUASH
));
1026 /* needs dq_data_lock */
1027 static int check_idq(struct dquot
*dquot
, ulong inodes
, char *warntype
)
1029 *warntype
= QUOTA_NL_NOWARN
;
1030 if (inodes
<= 0 || test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1033 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1034 (dquot
->dq_dqb
.dqb_curinodes
+ inodes
) > dquot
->dq_dqb
.dqb_ihardlimit
&&
1035 !ignore_hardlimit(dquot
)) {
1036 *warntype
= QUOTA_NL_IHARDWARN
;
1040 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1041 (dquot
->dq_dqb
.dqb_curinodes
+ inodes
) > dquot
->dq_dqb
.dqb_isoftlimit
&&
1042 dquot
->dq_dqb
.dqb_itime
&& get_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1043 !ignore_hardlimit(dquot
)) {
1044 *warntype
= QUOTA_NL_ISOFTLONGWARN
;
1048 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1049 (dquot
->dq_dqb
.dqb_curinodes
+ inodes
) > dquot
->dq_dqb
.dqb_isoftlimit
&&
1050 dquot
->dq_dqb
.dqb_itime
== 0) {
1051 *warntype
= QUOTA_NL_ISOFTWARN
;
1052 dquot
->dq_dqb
.dqb_itime
= get_seconds() + sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_igrace
;
1058 /* needs dq_data_lock */
1059 static int check_bdq(struct dquot
*dquot
, qsize_t space
, int prealloc
, char *warntype
)
1061 *warntype
= QUOTA_NL_NOWARN
;
1062 if (space
<= 0 || test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1065 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1066 toqb(dquot
->dq_dqb
.dqb_curspace
+ space
) > dquot
->dq_dqb
.dqb_bhardlimit
&&
1067 !ignore_hardlimit(dquot
)) {
1069 *warntype
= QUOTA_NL_BHARDWARN
;
1073 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1074 toqb(dquot
->dq_dqb
.dqb_curspace
+ space
) > dquot
->dq_dqb
.dqb_bsoftlimit
&&
1075 dquot
->dq_dqb
.dqb_btime
&& get_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1076 !ignore_hardlimit(dquot
)) {
1078 *warntype
= QUOTA_NL_BSOFTLONGWARN
;
1082 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1083 toqb(dquot
->dq_dqb
.dqb_curspace
+ space
) > dquot
->dq_dqb
.dqb_bsoftlimit
&&
1084 dquot
->dq_dqb
.dqb_btime
== 0) {
1086 *warntype
= QUOTA_NL_BSOFTWARN
;
1087 dquot
->dq_dqb
.dqb_btime
= get_seconds() + sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_bgrace
;
1091 * We don't allow preallocation to exceed softlimit so exceeding will
1101 * Initialize quota pointers in inode
1102 * Transaction must be started at entry
1104 int dquot_initialize(struct inode
*inode
, int type
)
1106 unsigned int id
= 0;
1109 /* First test before acquiring mutex - solves deadlocks when we
1110 * re-enter the quota code and are already holding the mutex */
1111 if (IS_NOQUOTA(inode
))
1113 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1114 /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
1115 if (IS_NOQUOTA(inode
))
1117 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1118 if (type
!= -1 && cnt
!= type
)
1120 if (inode
->i_dquot
[cnt
] == NODQUOT
) {
1129 inode
->i_dquot
[cnt
] = dqget(inode
->i_sb
, id
, cnt
);
1133 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1138 * Release all quotas referenced by inode
1139 * Transaction must be started at an entry
1141 int dquot_drop(struct inode
*inode
)
1145 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1146 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1147 if (inode
->i_dquot
[cnt
] != NODQUOT
) {
1148 dqput(inode
->i_dquot
[cnt
]);
1149 inode
->i_dquot
[cnt
] = NODQUOT
;
1152 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1156 /* Wrapper to remove references to quota structures from inode */
1157 void vfs_dq_drop(struct inode
*inode
)
1159 /* Here we can get arbitrary inode from clear_inode() so we have
1160 * to be careful. OTOH we don't need locking as quota operations
1161 * are allowed to change only at mount time */
1162 if (!IS_NOQUOTA(inode
) && inode
->i_sb
&& inode
->i_sb
->dq_op
1163 && inode
->i_sb
->dq_op
->drop
) {
1165 /* Test before calling to rule out calls from proc and such
1166 * where we are not allowed to block. Note that this is
1167 * actually reliable test even without the lock - the caller
1168 * must assure that nobody can come after the DQUOT_DROP and
1169 * add quota pointers back anyway */
1170 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1171 if (inode
->i_dquot
[cnt
] != NODQUOT
)
1173 if (cnt
< MAXQUOTAS
)
1174 inode
->i_sb
->dq_op
->drop(inode
);
1179 * Following four functions update i_blocks+i_bytes fields and
1180 * quota information (together with appropriate checks)
1181 * NOTE: We absolutely rely on the fact that caller dirties
1182 * the inode (usually macros in quotaops.h care about this) and
1183 * holds a handle for the current transaction so that dquot write and
1184 * inode write go into the same transaction.
1188 * This operation can block, but only after everything is updated
1190 int dquot_alloc_space(struct inode
*inode
, qsize_t number
, int warn
)
1192 int cnt
, ret
= NO_QUOTA
;
1193 char warntype
[MAXQUOTAS
];
1195 /* First test before acquiring mutex - solves deadlocks when we
1196 * re-enter the quota code and are already holding the mutex */
1197 if (IS_NOQUOTA(inode
)) {
1199 inode_add_bytes(inode
, number
);
1202 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1203 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1205 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1206 if (IS_NOQUOTA(inode
)) { /* Now we can do reliable test... */
1207 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1210 spin_lock(&dq_data_lock
);
1211 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1212 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1214 if (check_bdq(inode
->i_dquot
[cnt
], number
, warn
, warntype
+cnt
) == NO_QUOTA
)
1217 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1218 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1220 dquot_incr_space(inode
->i_dquot
[cnt
], number
);
1222 inode_add_bytes(inode
, number
);
1225 spin_unlock(&dq_data_lock
);
1226 if (ret
== QUOTA_OK
)
1227 /* Dirtify all the dquots - this can block when journalling */
1228 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1229 if (inode
->i_dquot
[cnt
])
1230 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1231 flush_warnings(inode
->i_dquot
, warntype
);
1232 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1237 * This operation can block, but only after everything is updated
1239 int dquot_alloc_inode(const struct inode
*inode
, unsigned long number
)
1241 int cnt
, ret
= NO_QUOTA
;
1242 char warntype
[MAXQUOTAS
];
1244 /* First test before acquiring mutex - solves deadlocks when we
1245 * re-enter the quota code and are already holding the mutex */
1246 if (IS_NOQUOTA(inode
))
1248 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1249 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1250 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1251 if (IS_NOQUOTA(inode
)) {
1252 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1255 spin_lock(&dq_data_lock
);
1256 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1257 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1259 if (check_idq(inode
->i_dquot
[cnt
], number
, warntype
+cnt
) == NO_QUOTA
)
1263 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1264 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1266 dquot_incr_inodes(inode
->i_dquot
[cnt
], number
);
1270 spin_unlock(&dq_data_lock
);
1271 if (ret
== QUOTA_OK
)
1272 /* Dirtify all the dquots - this can block when journalling */
1273 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1274 if (inode
->i_dquot
[cnt
])
1275 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1276 flush_warnings(inode
->i_dquot
, warntype
);
1277 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1282 * This operation can block, but only after everything is updated
1284 int dquot_free_space(struct inode
*inode
, qsize_t number
)
1288 /* First test before acquiring mutex - solves deadlocks when we
1289 * re-enter the quota code and are already holding the mutex */
1290 if (IS_NOQUOTA(inode
)) {
1292 inode_sub_bytes(inode
, number
);
1295 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1296 /* Now recheck reliably when holding dqptr_sem */
1297 if (IS_NOQUOTA(inode
)) {
1298 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1301 spin_lock(&dq_data_lock
);
1302 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1303 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1305 dquot_decr_space(inode
->i_dquot
[cnt
], number
);
1307 inode_sub_bytes(inode
, number
);
1308 spin_unlock(&dq_data_lock
);
1309 /* Dirtify all the dquots - this can block when journalling */
1310 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1311 if (inode
->i_dquot
[cnt
])
1312 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1313 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1318 * This operation can block, but only after everything is updated
1320 int dquot_free_inode(const struct inode
*inode
, unsigned long number
)
1324 /* First test before acquiring mutex - solves deadlocks when we
1325 * re-enter the quota code and are already holding the mutex */
1326 if (IS_NOQUOTA(inode
))
1328 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1329 /* Now recheck reliably when holding dqptr_sem */
1330 if (IS_NOQUOTA(inode
)) {
1331 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1334 spin_lock(&dq_data_lock
);
1335 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1336 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1338 dquot_decr_inodes(inode
->i_dquot
[cnt
], number
);
1340 spin_unlock(&dq_data_lock
);
1341 /* Dirtify all the dquots - this can block when journalling */
1342 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1343 if (inode
->i_dquot
[cnt
])
1344 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1345 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1350 * Transfer the number of inode and blocks from one diskquota to an other.
1352 * This operation can block, but only after everything is updated
1353 * A transaction must be started when entering this function.
1355 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
1358 struct dquot
*transfer_from
[MAXQUOTAS
];
1359 struct dquot
*transfer_to
[MAXQUOTAS
];
1360 int cnt
, ret
= NO_QUOTA
, chuid
= (iattr
->ia_valid
& ATTR_UID
) && inode
->i_uid
!= iattr
->ia_uid
,
1361 chgid
= (iattr
->ia_valid
& ATTR_GID
) && inode
->i_gid
!= iattr
->ia_gid
;
1362 char warntype
[MAXQUOTAS
];
1364 /* First test before acquiring mutex - solves deadlocks when we
1365 * re-enter the quota code and are already holding the mutex */
1366 if (IS_NOQUOTA(inode
))
1368 /* Clear the arrays */
1369 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1370 transfer_to
[cnt
] = transfer_from
[cnt
] = NODQUOT
;
1371 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1373 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1374 /* Now recheck reliably when holding dqptr_sem */
1375 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1376 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1379 /* First build the transfer_to list - here we can block on
1380 * reading/instantiating of dquots. We know that the transaction for
1381 * us was already started so we don't violate lock ranking here */
1382 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1387 transfer_to
[cnt
] = dqget(inode
->i_sb
, iattr
->ia_uid
, cnt
);
1392 transfer_to
[cnt
] = dqget(inode
->i_sb
, iattr
->ia_gid
, cnt
);
1396 spin_lock(&dq_data_lock
);
1397 space
= inode_get_bytes(inode
);
1398 /* Build the transfer_from list and check the limits */
1399 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1400 if (transfer_to
[cnt
] == NODQUOT
)
1402 transfer_from
[cnt
] = inode
->i_dquot
[cnt
];
1403 if (check_idq(transfer_to
[cnt
], 1, warntype
+cnt
) == NO_QUOTA
||
1404 check_bdq(transfer_to
[cnt
], space
, 0, warntype
+cnt
) == NO_QUOTA
)
1409 * Finally perform the needed transfer from transfer_from to transfer_to
1411 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1413 * Skip changes for same uid or gid or for turned off quota-type.
1415 if (transfer_to
[cnt
] == NODQUOT
)
1418 /* Due to IO error we might not have transfer_from[] structure */
1419 if (transfer_from
[cnt
]) {
1420 dquot_decr_inodes(transfer_from
[cnt
], 1);
1421 dquot_decr_space(transfer_from
[cnt
], space
);
1424 dquot_incr_inodes(transfer_to
[cnt
], 1);
1425 dquot_incr_space(transfer_to
[cnt
], space
);
1427 inode
->i_dquot
[cnt
] = transfer_to
[cnt
];
1431 spin_unlock(&dq_data_lock
);
1432 /* Dirtify all the dquots - this can block when journalling */
1433 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1434 if (transfer_from
[cnt
])
1435 mark_dquot_dirty(transfer_from
[cnt
]);
1436 if (transfer_to
[cnt
])
1437 mark_dquot_dirty(transfer_to
[cnt
]);
1439 flush_warnings(transfer_to
, warntype
);
1441 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1442 if (ret
== QUOTA_OK
&& transfer_from
[cnt
] != NODQUOT
)
1443 dqput(transfer_from
[cnt
]);
1444 if (ret
== NO_QUOTA
&& transfer_to
[cnt
] != NODQUOT
)
1445 dqput(transfer_to
[cnt
]);
1447 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1451 /* Wrapper for transferring ownership of an inode */
1452 int vfs_dq_transfer(struct inode
*inode
, struct iattr
*iattr
)
1454 if (sb_any_quota_enabled(inode
->i_sb
) && !IS_NOQUOTA(inode
)) {
1456 if (inode
->i_sb
->dq_op
->transfer(inode
, iattr
) == NO_QUOTA
)
1464 * Write info of quota file to disk
1466 int dquot_commit_info(struct super_block
*sb
, int type
)
1469 struct quota_info
*dqopt
= sb_dqopt(sb
);
1471 mutex_lock(&dqopt
->dqio_mutex
);
1472 ret
= dqopt
->ops
[type
]->write_file_info(sb
, type
);
1473 mutex_unlock(&dqopt
->dqio_mutex
);
1478 * Definitions of diskquota operations.
1480 struct dquot_operations dquot_operations
= {
1481 .initialize
= dquot_initialize
,
1483 .alloc_space
= dquot_alloc_space
,
1484 .alloc_inode
= dquot_alloc_inode
,
1485 .free_space
= dquot_free_space
,
1486 .free_inode
= dquot_free_inode
,
1487 .transfer
= dquot_transfer
,
1488 .write_dquot
= dquot_commit
,
1489 .acquire_dquot
= dquot_acquire
,
1490 .release_dquot
= dquot_release
,
1491 .mark_dirty
= dquot_mark_dquot_dirty
,
1492 .write_info
= dquot_commit_info
1495 static inline void set_enable_flags(struct quota_info
*dqopt
, int type
)
1499 dqopt
->flags
|= DQUOT_USR_ENABLED
;
1500 dqopt
->flags
&= ~DQUOT_USR_SUSPENDED
;
1503 dqopt
->flags
|= DQUOT_GRP_ENABLED
;
1504 dqopt
->flags
&= ~DQUOT_GRP_SUSPENDED
;
1509 static inline void reset_enable_flags(struct quota_info
*dqopt
, int type
,
1514 dqopt
->flags
&= ~DQUOT_USR_ENABLED
;
1516 dqopt
->flags
|= DQUOT_USR_SUSPENDED
;
1518 dqopt
->flags
&= ~DQUOT_USR_SUSPENDED
;
1521 dqopt
->flags
&= ~DQUOT_GRP_ENABLED
;
1523 dqopt
->flags
|= DQUOT_GRP_SUSPENDED
;
1525 dqopt
->flags
&= ~DQUOT_GRP_SUSPENDED
;
1532 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1534 int vfs_quota_off(struct super_block
*sb
, int type
, int remount
)
1537 struct quota_info
*dqopt
= sb_dqopt(sb
);
1538 struct inode
*toputinode
[MAXQUOTAS
];
1540 /* We need to serialize quota_off() for device */
1541 mutex_lock(&dqopt
->dqonoff_mutex
);
1544 * Skip everything if there's nothing to do. We have to do this because
1545 * sometimes we are called when fill_super() failed and calling
1546 * sync_fs() in such cases does no good.
1548 if (!sb_any_quota_enabled(sb
) && !sb_any_quota_suspended(sb
)) {
1549 mutex_unlock(&dqopt
->dqonoff_mutex
);
1552 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1553 toputinode
[cnt
] = NULL
;
1554 if (type
!= -1 && cnt
!= type
)
1556 /* If we keep inodes of quota files after remount and quotaoff
1557 * is called, drop kept inodes. */
1558 if (!remount
&& sb_has_quota_suspended(sb
, cnt
)) {
1559 iput(dqopt
->files
[cnt
]);
1560 dqopt
->files
[cnt
] = NULL
;
1561 reset_enable_flags(dqopt
, cnt
, 0);
1564 if (!sb_has_quota_enabled(sb
, cnt
))
1566 reset_enable_flags(dqopt
, cnt
, remount
);
1568 /* Note: these are blocking operations */
1569 drop_dquot_ref(sb
, cnt
);
1570 invalidate_dquots(sb
, cnt
);
1572 * Now all dquots should be invalidated, all writes done so we should be only
1573 * users of the info. No locks needed.
1575 if (info_dirty(&dqopt
->info
[cnt
]))
1576 sb
->dq_op
->write_info(sb
, cnt
);
1577 if (dqopt
->ops
[cnt
]->free_file_info
)
1578 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
1579 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
1581 toputinode
[cnt
] = dqopt
->files
[cnt
];
1583 dqopt
->files
[cnt
] = NULL
;
1584 dqopt
->info
[cnt
].dqi_flags
= 0;
1585 dqopt
->info
[cnt
].dqi_igrace
= 0;
1586 dqopt
->info
[cnt
].dqi_bgrace
= 0;
1587 dqopt
->ops
[cnt
] = NULL
;
1589 mutex_unlock(&dqopt
->dqonoff_mutex
);
1590 /* Sync the superblock so that buffers with quota data are written to
1591 * disk (and so userspace sees correct data afterwards). */
1592 if (sb
->s_op
->sync_fs
)
1593 sb
->s_op
->sync_fs(sb
, 1);
1594 sync_blockdev(sb
->s_bdev
);
1595 /* Now the quota files are just ordinary files and we can set the
1596 * inode flags back. Moreover we discard the pagecache so that
1597 * userspace sees the writes we did bypassing the pagecache. We
1598 * must also discard the blockdev buffers so that we see the
1599 * changes done by userspace on the next quotaon() */
1600 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1601 if (toputinode
[cnt
]) {
1602 mutex_lock(&dqopt
->dqonoff_mutex
);
1603 /* If quota was reenabled in the meantime, we have
1605 if (!sb_has_quota_enabled(sb
, cnt
)) {
1606 mutex_lock_nested(&toputinode
[cnt
]->i_mutex
, I_MUTEX_QUOTA
);
1607 toputinode
[cnt
]->i_flags
&= ~(S_IMMUTABLE
|
1608 S_NOATIME
| S_NOQUOTA
);
1609 truncate_inode_pages(&toputinode
[cnt
]->i_data
, 0);
1610 mutex_unlock(&toputinode
[cnt
]->i_mutex
);
1611 mark_inode_dirty(toputinode
[cnt
]);
1613 mutex_unlock(&dqopt
->dqonoff_mutex
);
1614 /* On remount RO, we keep the inode pointer so that we
1615 * can reenable quota on the subsequent remount RW.
1616 * But we have better not keep inode pointer when there
1617 * is pending delete on the quota file... */
1619 iput(toputinode
[cnt
]);
1620 else if (!toputinode
[cnt
]->i_nlink
)
1624 invalidate_bdev(sb
->s_bdev
);
1629 * Turn quotas on on a device
1632 /* Helper function when we already have the inode */
1633 static int vfs_quota_on_inode(struct inode
*inode
, int type
, int format_id
)
1635 struct quota_format_type
*fmt
= find_quota_format(format_id
);
1636 struct super_block
*sb
= inode
->i_sb
;
1637 struct quota_info
*dqopt
= sb_dqopt(sb
);
1643 if (!S_ISREG(inode
->i_mode
)) {
1647 if (IS_RDONLY(inode
)) {
1651 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
) {
1656 /* As we bypass the pagecache we must now flush the inode so that
1657 * we see all the changes from userspace... */
1658 write_inode_now(inode
, 1);
1659 /* And now flush the block cache so that kernel sees the changes */
1660 invalidate_bdev(sb
->s_bdev
);
1661 mutex_lock(&inode
->i_mutex
);
1662 mutex_lock(&dqopt
->dqonoff_mutex
);
1663 if (sb_has_quota_enabled(sb
, type
) ||
1664 sb_has_quota_suspended(sb
, type
)) {
1668 /* We don't want quota and atime on quota files (deadlocks possible)
1669 * Also nobody should write to the file - we use special IO operations
1670 * which ignore the immutable bit. */
1671 down_write(&dqopt
->dqptr_sem
);
1672 oldflags
= inode
->i_flags
& (S_NOATIME
| S_IMMUTABLE
| S_NOQUOTA
);
1673 inode
->i_flags
|= S_NOQUOTA
| S_NOATIME
| S_IMMUTABLE
;
1674 up_write(&dqopt
->dqptr_sem
);
1675 sb
->dq_op
->drop(inode
);
1678 dqopt
->files
[type
] = igrab(inode
);
1679 if (!dqopt
->files
[type
])
1682 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
1685 dqopt
->ops
[type
] = fmt
->qf_ops
;
1686 dqopt
->info
[type
].dqi_format
= fmt
;
1687 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
1688 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
1689 mutex_lock(&dqopt
->dqio_mutex
);
1690 if ((error
= dqopt
->ops
[type
]->read_file_info(sb
, type
)) < 0) {
1691 mutex_unlock(&dqopt
->dqio_mutex
);
1694 mutex_unlock(&dqopt
->dqio_mutex
);
1695 mutex_unlock(&inode
->i_mutex
);
1696 set_enable_flags(dqopt
, type
);
1698 add_dquot_ref(sb
, type
);
1699 mutex_unlock(&dqopt
->dqonoff_mutex
);
1704 dqopt
->files
[type
] = NULL
;
1707 mutex_unlock(&dqopt
->dqonoff_mutex
);
1708 if (oldflags
!= -1) {
1709 down_write(&dqopt
->dqptr_sem
);
1710 /* Set the flags back (in the case of accidental quotaon()
1711 * on a wrong file we don't want to mess up the flags) */
1712 inode
->i_flags
&= ~(S_NOATIME
| S_NOQUOTA
| S_IMMUTABLE
);
1713 inode
->i_flags
|= oldflags
;
1714 up_write(&dqopt
->dqptr_sem
);
1716 mutex_unlock(&inode
->i_mutex
);
1718 put_quota_format(fmt
);
1723 /* Reenable quotas on remount RW */
1724 static int vfs_quota_on_remount(struct super_block
*sb
, int type
)
1726 struct quota_info
*dqopt
= sb_dqopt(sb
);
1727 struct inode
*inode
;
1730 mutex_lock(&dqopt
->dqonoff_mutex
);
1731 if (!sb_has_quota_suspended(sb
, type
)) {
1732 mutex_unlock(&dqopt
->dqonoff_mutex
);
1735 BUG_ON(sb_has_quota_enabled(sb
, type
));
1737 inode
= dqopt
->files
[type
];
1738 dqopt
->files
[type
] = NULL
;
1739 reset_enable_flags(dqopt
, type
, 0);
1740 mutex_unlock(&dqopt
->dqonoff_mutex
);
1742 ret
= vfs_quota_on_inode(inode
, type
, dqopt
->info
[type
].dqi_fmt_id
);
1748 /* Actual function called from quotactl() */
1749 int vfs_quota_on(struct super_block
*sb
, int type
, int format_id
, char *path
,
1752 struct nameidata nd
;
1756 return vfs_quota_on_remount(sb
, type
);
1758 error
= path_lookup(path
, LOOKUP_FOLLOW
, &nd
);
1761 error
= security_quota_on(nd
.path
.dentry
);
1764 /* Quota file not on the same filesystem? */
1765 if (nd
.path
.mnt
->mnt_sb
!= sb
)
1768 error
= vfs_quota_on_inode(nd
.path
.dentry
->d_inode
, type
,
1776 * This function is used when filesystem needs to initialize quotas
1777 * during mount time.
1779 int vfs_quota_on_mount(struct super_block
*sb
, char *qf_name
,
1780 int format_id
, int type
)
1782 struct dentry
*dentry
;
1785 dentry
= lookup_one_len(qf_name
, sb
->s_root
, strlen(qf_name
));
1787 return PTR_ERR(dentry
);
1789 if (!dentry
->d_inode
) {
1794 error
= security_quota_on(dentry
);
1796 error
= vfs_quota_on_inode(dentry
->d_inode
, type
, format_id
);
1803 /* Wrapper to turn on quotas when remounting rw */
1804 int vfs_dq_quota_on_remount(struct super_block
*sb
)
1809 if (!sb
->s_qcop
|| !sb
->s_qcop
->quota_on
)
1811 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1812 err
= sb
->s_qcop
->quota_on(sb
, cnt
, 0, NULL
, 1);
1813 if (err
< 0 && !ret
)
1819 /* Generic routine for getting common part of quota structure */
1820 static void do_get_dqblk(struct dquot
*dquot
, struct if_dqblk
*di
)
1822 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
1824 spin_lock(&dq_data_lock
);
1825 di
->dqb_bhardlimit
= dm
->dqb_bhardlimit
;
1826 di
->dqb_bsoftlimit
= dm
->dqb_bsoftlimit
;
1827 di
->dqb_curspace
= dm
->dqb_curspace
;
1828 di
->dqb_ihardlimit
= dm
->dqb_ihardlimit
;
1829 di
->dqb_isoftlimit
= dm
->dqb_isoftlimit
;
1830 di
->dqb_curinodes
= dm
->dqb_curinodes
;
1831 di
->dqb_btime
= dm
->dqb_btime
;
1832 di
->dqb_itime
= dm
->dqb_itime
;
1833 di
->dqb_valid
= QIF_ALL
;
1834 spin_unlock(&dq_data_lock
);
1837 int vfs_get_dqblk(struct super_block
*sb
, int type
, qid_t id
, struct if_dqblk
*di
)
1839 struct dquot
*dquot
;
1841 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
1842 if (!(dquot
= dqget(sb
, id
, type
))) {
1843 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
1846 do_get_dqblk(dquot
, di
);
1848 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
1852 /* Generic routine for setting common part of quota structure */
1853 static int do_set_dqblk(struct dquot
*dquot
, struct if_dqblk
*di
)
1855 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
1856 int check_blim
= 0, check_ilim
= 0;
1857 struct mem_dqinfo
*dqi
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
1859 if ((di
->dqb_valid
& QIF_BLIMITS
&&
1860 (di
->dqb_bhardlimit
> dqi
->dqi_maxblimit
||
1861 di
->dqb_bsoftlimit
> dqi
->dqi_maxblimit
)) ||
1862 (di
->dqb_valid
& QIF_ILIMITS
&&
1863 (di
->dqb_ihardlimit
> dqi
->dqi_maxilimit
||
1864 di
->dqb_isoftlimit
> dqi
->dqi_maxilimit
)))
1867 spin_lock(&dq_data_lock
);
1868 if (di
->dqb_valid
& QIF_SPACE
) {
1869 dm
->dqb_curspace
= di
->dqb_curspace
;
1872 if (di
->dqb_valid
& QIF_BLIMITS
) {
1873 dm
->dqb_bsoftlimit
= di
->dqb_bsoftlimit
;
1874 dm
->dqb_bhardlimit
= di
->dqb_bhardlimit
;
1877 if (di
->dqb_valid
& QIF_INODES
) {
1878 dm
->dqb_curinodes
= di
->dqb_curinodes
;
1881 if (di
->dqb_valid
& QIF_ILIMITS
) {
1882 dm
->dqb_isoftlimit
= di
->dqb_isoftlimit
;
1883 dm
->dqb_ihardlimit
= di
->dqb_ihardlimit
;
1886 if (di
->dqb_valid
& QIF_BTIME
)
1887 dm
->dqb_btime
= di
->dqb_btime
;
1888 if (di
->dqb_valid
& QIF_ITIME
)
1889 dm
->dqb_itime
= di
->dqb_itime
;
1892 if (!dm
->dqb_bsoftlimit
|| toqb(dm
->dqb_curspace
) < dm
->dqb_bsoftlimit
) {
1894 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1896 else if (!(di
->dqb_valid
& QIF_BTIME
)) /* Set grace only if user hasn't provided his own... */
1897 dm
->dqb_btime
= get_seconds() + dqi
->dqi_bgrace
;
1900 if (!dm
->dqb_isoftlimit
|| dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
1902 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
1904 else if (!(di
->dqb_valid
& QIF_ITIME
)) /* Set grace only if user hasn't provided his own... */
1905 dm
->dqb_itime
= get_seconds() + dqi
->dqi_igrace
;
1907 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
|| dm
->dqb_isoftlimit
)
1908 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
1910 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
1911 spin_unlock(&dq_data_lock
);
1912 mark_dquot_dirty(dquot
);
1917 int vfs_set_dqblk(struct super_block
*sb
, int type
, qid_t id
, struct if_dqblk
*di
)
1919 struct dquot
*dquot
;
1922 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
1923 if (!(dquot
= dqget(sb
, id
, type
))) {
1924 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
1927 rc
= do_set_dqblk(dquot
, di
);
1929 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
1933 /* Generic routine for getting common part of quota file information */
1934 int vfs_get_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
1936 struct mem_dqinfo
*mi
;
1938 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
1939 if (!sb_has_quota_enabled(sb
, type
)) {
1940 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
1943 mi
= sb_dqopt(sb
)->info
+ type
;
1944 spin_lock(&dq_data_lock
);
1945 ii
->dqi_bgrace
= mi
->dqi_bgrace
;
1946 ii
->dqi_igrace
= mi
->dqi_igrace
;
1947 ii
->dqi_flags
= mi
->dqi_flags
& DQF_MASK
;
1948 ii
->dqi_valid
= IIF_ALL
;
1949 spin_unlock(&dq_data_lock
);
1950 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
1954 /* Generic routine for setting common part of quota file information */
1955 int vfs_set_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
1957 struct mem_dqinfo
*mi
;
1959 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
1960 if (!sb_has_quota_enabled(sb
, type
)) {
1961 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
1964 mi
= sb_dqopt(sb
)->info
+ type
;
1965 spin_lock(&dq_data_lock
);
1966 if (ii
->dqi_valid
& IIF_BGRACE
)
1967 mi
->dqi_bgrace
= ii
->dqi_bgrace
;
1968 if (ii
->dqi_valid
& IIF_IGRACE
)
1969 mi
->dqi_igrace
= ii
->dqi_igrace
;
1970 if (ii
->dqi_valid
& IIF_FLAGS
)
1971 mi
->dqi_flags
= (mi
->dqi_flags
& ~DQF_MASK
) | (ii
->dqi_flags
& DQF_MASK
);
1972 spin_unlock(&dq_data_lock
);
1973 mark_info_dirty(sb
, type
);
1974 /* Force write to disk */
1975 sb
->dq_op
->write_info(sb
, type
);
1976 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
1980 struct quotactl_ops vfs_quotactl_ops
= {
1981 .quota_on
= vfs_quota_on
,
1982 .quota_off
= vfs_quota_off
,
1983 .quota_sync
= vfs_quota_sync
,
1984 .get_info
= vfs_get_dqinfo
,
1985 .set_info
= vfs_set_dqinfo
,
1986 .get_dqblk
= vfs_get_dqblk
,
1987 .set_dqblk
= vfs_set_dqblk
1990 static ctl_table fs_dqstats_table
[] = {
1992 .ctl_name
= FS_DQ_LOOKUPS
,
1993 .procname
= "lookups",
1994 .data
= &dqstats
.lookups
,
1995 .maxlen
= sizeof(int),
1997 .proc_handler
= &proc_dointvec
,
2000 .ctl_name
= FS_DQ_DROPS
,
2001 .procname
= "drops",
2002 .data
= &dqstats
.drops
,
2003 .maxlen
= sizeof(int),
2005 .proc_handler
= &proc_dointvec
,
2008 .ctl_name
= FS_DQ_READS
,
2009 .procname
= "reads",
2010 .data
= &dqstats
.reads
,
2011 .maxlen
= sizeof(int),
2013 .proc_handler
= &proc_dointvec
,
2016 .ctl_name
= FS_DQ_WRITES
,
2017 .procname
= "writes",
2018 .data
= &dqstats
.writes
,
2019 .maxlen
= sizeof(int),
2021 .proc_handler
= &proc_dointvec
,
2024 .ctl_name
= FS_DQ_CACHE_HITS
,
2025 .procname
= "cache_hits",
2026 .data
= &dqstats
.cache_hits
,
2027 .maxlen
= sizeof(int),
2029 .proc_handler
= &proc_dointvec
,
2032 .ctl_name
= FS_DQ_ALLOCATED
,
2033 .procname
= "allocated_dquots",
2034 .data
= &dqstats
.allocated_dquots
,
2035 .maxlen
= sizeof(int),
2037 .proc_handler
= &proc_dointvec
,
2040 .ctl_name
= FS_DQ_FREE
,
2041 .procname
= "free_dquots",
2042 .data
= &dqstats
.free_dquots
,
2043 .maxlen
= sizeof(int),
2045 .proc_handler
= &proc_dointvec
,
2048 .ctl_name
= FS_DQ_SYNCS
,
2049 .procname
= "syncs",
2050 .data
= &dqstats
.syncs
,
2051 .maxlen
= sizeof(int),
2053 .proc_handler
= &proc_dointvec
,
2055 #ifdef CONFIG_PRINT_QUOTA_WARNING
2057 .ctl_name
= FS_DQ_WARNINGS
,
2058 .procname
= "warnings",
2059 .data
= &flag_print_warnings
,
2060 .maxlen
= sizeof(int),
2062 .proc_handler
= &proc_dointvec
,
2068 static ctl_table fs_table
[] = {
2070 .ctl_name
= FS_DQSTATS
,
2071 .procname
= "quota",
2073 .child
= fs_dqstats_table
,
2078 static ctl_table sys_table
[] = {
2088 static int __init
dquot_init(void)
2091 unsigned long nr_hash
, order
;
2093 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2095 register_sysctl_table(sys_table
);
2097 dquot_cachep
= kmem_cache_create("dquot",
2098 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2099 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2100 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2104 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
2106 panic("Cannot create dquot hash table");
2108 /* Find power-of-two hlist_heads which can fit into allocation */
2109 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2113 } while (nr_hash
>> dq_hash_bits
);
2116 nr_hash
= 1UL << dq_hash_bits
;
2117 dq_hash_mask
= nr_hash
- 1;
2118 for (i
= 0; i
< nr_hash
; i
++)
2119 INIT_HLIST_HEAD(dquot_hash
+ i
);
2121 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2122 nr_hash
, order
, (PAGE_SIZE
<< order
));
2124 register_shrinker(&dqcache_shrinker
);
2126 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
2127 if (genl_register_family("a_genl_family
) != 0)
2128 printk(KERN_ERR
"VFS: Failed to create quota netlink interface.\n");
2133 module_init(dquot_init
);
2135 EXPORT_SYMBOL(register_quota_format
);
2136 EXPORT_SYMBOL(unregister_quota_format
);
2137 EXPORT_SYMBOL(dqstats
);
2138 EXPORT_SYMBOL(dq_data_lock
);
2139 EXPORT_SYMBOL(vfs_quota_on
);
2140 EXPORT_SYMBOL(vfs_quota_on_mount
);
2141 EXPORT_SYMBOL(vfs_quota_off
);
2142 EXPORT_SYMBOL(vfs_quota_sync
);
2143 EXPORT_SYMBOL(vfs_get_dqinfo
);
2144 EXPORT_SYMBOL(vfs_set_dqinfo
);
2145 EXPORT_SYMBOL(vfs_get_dqblk
);
2146 EXPORT_SYMBOL(vfs_set_dqblk
);
2147 EXPORT_SYMBOL(dquot_commit
);
2148 EXPORT_SYMBOL(dquot_commit_info
);
2149 EXPORT_SYMBOL(dquot_acquire
);
2150 EXPORT_SYMBOL(dquot_release
);
2151 EXPORT_SYMBOL(dquot_mark_dquot_dirty
);
2152 EXPORT_SYMBOL(dquot_initialize
);
2153 EXPORT_SYMBOL(dquot_drop
);
2154 EXPORT_SYMBOL(vfs_dq_drop
);
2155 EXPORT_SYMBOL(dquot_alloc_space
);
2156 EXPORT_SYMBOL(dquot_alloc_inode
);
2157 EXPORT_SYMBOL(dquot_free_space
);
2158 EXPORT_SYMBOL(dquot_free_inode
);
2159 EXPORT_SYMBOL(dquot_transfer
);
2160 EXPORT_SYMBOL(vfs_dq_transfer
);
2161 EXPORT_SYMBOL(vfs_dq_quota_on_remount
);