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/smp_lock.h>
73 #include <linux/init.h>
74 #include <linux/module.h>
75 #include <linux/proc_fs.h>
76 #include <linux/security.h>
77 #include <linux/kmod.h>
78 #include <linux/namei.h>
79 #include <linux/buffer_head.h>
80 #include <linux/capability.h>
81 #include <linux/quotaops.h>
83 #include <asm/uaccess.h>
85 #define __DQUOT_PARANOIA
88 * There are two quota SMP locks. dq_list_lock protects all lists with quotas
89 * and quota formats and also dqstats structure containing statistics about the
90 * lists. dq_data_lock protects data from dq_dqb and also mem_dqinfo structures
91 * and also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
92 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
93 * in inode_add_bytes() and inode_sub_bytes().
95 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock
97 * Note that some things (eg. sb pointer, type, id) doesn't change during
98 * the life of the dquot structure and so needn't to be protected by a lock
100 * Any operation working on dquots via inode pointers must hold dqptr_sem. If
101 * operation is just reading pointers from inode (or not using them at all) the
102 * read lock is enough. If pointers are altered function must hold write lock
103 * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
104 * for altering the flag i_mutex is also needed). If operation is holding
105 * reference to dquot in other way (e.g. quotactl ops) it must be guarded by
107 * This locking assures that:
108 * a) update/access to dquot pointers in inode is serialized
109 * b) everyone is guarded against invalidate_dquots()
111 * Each dquot has its dq_lock semaphore. 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 > dqio_sem
122 * i_mutex on quota files is special (it's below dqio_sem)
125 static DEFINE_SPINLOCK(dq_list_lock
);
126 DEFINE_SPINLOCK(dq_data_lock
);
128 static char *quotatypes
[] = INITQFNAMES
;
129 static struct quota_format_type
*quota_formats
; /* List of registered formats */
130 static struct quota_module_name module_names
[] = INIT_QUOTA_MODULE_NAMES
;
132 /* SLAB cache for dquot structures */
133 static kmem_cache_t
*dquot_cachep
;
135 int register_quota_format(struct quota_format_type
*fmt
)
137 spin_lock(&dq_list_lock
);
138 fmt
->qf_next
= quota_formats
;
140 spin_unlock(&dq_list_lock
);
144 void unregister_quota_format(struct quota_format_type
*fmt
)
146 struct quota_format_type
**actqf
;
148 spin_lock(&dq_list_lock
);
149 for (actqf
= "a_formats
; *actqf
&& *actqf
!= fmt
; actqf
= &(*actqf
)->qf_next
);
151 *actqf
= (*actqf
)->qf_next
;
152 spin_unlock(&dq_list_lock
);
155 static struct quota_format_type
*find_quota_format(int id
)
157 struct quota_format_type
*actqf
;
159 spin_lock(&dq_list_lock
);
160 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
; actqf
= actqf
->qf_next
);
161 if (!actqf
|| !try_module_get(actqf
->qf_owner
)) {
164 spin_unlock(&dq_list_lock
);
166 for (qm
= 0; module_names
[qm
].qm_fmt_id
&& module_names
[qm
].qm_fmt_id
!= id
; qm
++);
167 if (!module_names
[qm
].qm_fmt_id
|| request_module(module_names
[qm
].qm_mod_name
))
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
);
179 static void put_quota_format(struct quota_format_type
*fmt
)
181 module_put(fmt
->qf_owner
);
185 * Dquot List Management:
186 * The quota code uses three lists for dquot management: the inuse_list,
187 * free_dquots, and dquot_hash[] array. A single dquot structure may be
188 * on all three lists, depending on its current state.
190 * All dquots are placed to the end of inuse_list when first created, and this
191 * list is used for invalidate operation, which must look at every dquot.
193 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
194 * and this list is searched whenever we need an available dquot. Dquots are
195 * removed from the list as soon as they are used again, and
196 * dqstats.free_dquots gives the number of dquots on the list. When
197 * dquot is invalidated it's completely released from memory.
199 * Dquots with a specific identity (device, type and id) are placed on
200 * one of the dquot_hash[] hash chains. The provides an efficient search
201 * mechanism to locate a specific dquot.
204 static LIST_HEAD(inuse_list
);
205 static LIST_HEAD(free_dquots
);
206 static unsigned int dq_hash_bits
, dq_hash_mask
;
207 static struct hlist_head
*dquot_hash
;
209 struct dqstats dqstats
;
211 static void dqput(struct dquot
*dquot
);
213 static inline unsigned int
214 hashfn(const struct super_block
*sb
, unsigned int id
, int type
)
218 tmp
= (((unsigned long)sb
>>L1_CACHE_SHIFT
) ^ id
) * (MAXQUOTAS
- type
);
219 return (tmp
+ (tmp
>> dq_hash_bits
)) & dq_hash_mask
;
223 * Following list functions expect dq_list_lock to be held
225 static inline void insert_dquot_hash(struct dquot
*dquot
)
227 struct hlist_head
*head
= dquot_hash
+ hashfn(dquot
->dq_sb
, dquot
->dq_id
, dquot
->dq_type
);
228 hlist_add_head(&dquot
->dq_hash
, head
);
231 static inline void remove_dquot_hash(struct dquot
*dquot
)
233 hlist_del_init(&dquot
->dq_hash
);
236 static inline struct dquot
*find_dquot(unsigned int hashent
, struct super_block
*sb
, unsigned int id
, int type
)
238 struct hlist_node
*node
;
241 hlist_for_each (node
, dquot_hash
+hashent
) {
242 dquot
= hlist_entry(node
, struct dquot
, dq_hash
);
243 if (dquot
->dq_sb
== sb
&& dquot
->dq_id
== id
&& dquot
->dq_type
== type
)
249 /* Add a dquot to the tail of the free list */
250 static inline void put_dquot_last(struct dquot
*dquot
)
252 list_add(&dquot
->dq_free
, free_dquots
.prev
);
253 dqstats
.free_dquots
++;
256 static inline void remove_free_dquot(struct dquot
*dquot
)
258 if (list_empty(&dquot
->dq_free
))
260 list_del_init(&dquot
->dq_free
);
261 dqstats
.free_dquots
--;
264 static inline void put_inuse(struct dquot
*dquot
)
266 /* We add to the back of inuse list so we don't have to restart
267 * when traversing this list and we block */
268 list_add(&dquot
->dq_inuse
, inuse_list
.prev
);
269 dqstats
.allocated_dquots
++;
272 static inline void remove_inuse(struct dquot
*dquot
)
274 dqstats
.allocated_dquots
--;
275 list_del(&dquot
->dq_inuse
);
278 * End of list functions needing dq_list_lock
281 static void wait_on_dquot(struct dquot
*dquot
)
283 down(&dquot
->dq_lock
);
287 #define mark_dquot_dirty(dquot) ((dquot)->dq_sb->dq_op->mark_dirty(dquot))
289 int dquot_mark_dquot_dirty(struct dquot
*dquot
)
291 spin_lock(&dq_list_lock
);
292 if (!test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
))
293 list_add(&dquot
->dq_dirty
, &sb_dqopt(dquot
->dq_sb
)->
294 info
[dquot
->dq_type
].dqi_dirty_list
);
295 spin_unlock(&dq_list_lock
);
299 /* This function needs dq_list_lock */
300 static inline int clear_dquot_dirty(struct dquot
*dquot
)
302 if (!test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
))
304 list_del_init(&dquot
->dq_dirty
);
308 void mark_info_dirty(struct super_block
*sb
, int type
)
310 set_bit(DQF_INFO_DIRTY_B
, &sb_dqopt(sb
)->info
[type
].dqi_flags
);
312 EXPORT_SYMBOL(mark_info_dirty
);
315 * Read dquot from disk and alloc space for it
318 int dquot_acquire(struct dquot
*dquot
)
320 int ret
= 0, ret2
= 0;
321 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
323 down(&dquot
->dq_lock
);
324 down(&dqopt
->dqio_sem
);
325 if (!test_bit(DQ_READ_B
, &dquot
->dq_flags
))
326 ret
= dqopt
->ops
[dquot
->dq_type
]->read_dqblk(dquot
);
329 set_bit(DQ_READ_B
, &dquot
->dq_flags
);
330 /* Instantiate dquot if needed */
331 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && !dquot
->dq_off
) {
332 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
333 /* Write the info if needed */
334 if (info_dirty(&dqopt
->info
[dquot
->dq_type
]))
335 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(dquot
->dq_sb
, dquot
->dq_type
);
343 set_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
345 up(&dqopt
->dqio_sem
);
351 * Write dquot to disk
353 int dquot_commit(struct dquot
*dquot
)
355 int ret
= 0, ret2
= 0;
356 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
358 down(&dqopt
->dqio_sem
);
359 spin_lock(&dq_list_lock
);
360 if (!clear_dquot_dirty(dquot
)) {
361 spin_unlock(&dq_list_lock
);
364 spin_unlock(&dq_list_lock
);
365 /* Inactive dquot can be only if there was error during read/init
366 * => we have better not writing it */
367 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
368 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
369 if (info_dirty(&dqopt
->info
[dquot
->dq_type
]))
370 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(dquot
->dq_sb
, dquot
->dq_type
);
375 up(&dqopt
->dqio_sem
);
382 int dquot_release(struct dquot
*dquot
)
384 int ret
= 0, ret2
= 0;
385 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
387 down(&dquot
->dq_lock
);
388 /* Check whether we are not racing with some other dqget() */
389 if (atomic_read(&dquot
->dq_count
) > 1)
391 down(&dqopt
->dqio_sem
);
392 if (dqopt
->ops
[dquot
->dq_type
]->release_dqblk
) {
393 ret
= dqopt
->ops
[dquot
->dq_type
]->release_dqblk(dquot
);
395 if (info_dirty(&dqopt
->info
[dquot
->dq_type
]))
396 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(dquot
->dq_sb
, dquot
->dq_type
);
400 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
401 up(&dqopt
->dqio_sem
);
407 /* Invalidate all dquots on the list. Note that this function is called after
408 * quota is disabled and pointers from inodes removed so there cannot be new
409 * quota users. There can still be some users of quotas due to inodes being
410 * just deleted or pruned by prune_icache() (those are not attached to any
411 * list). We have to wait for such users.
413 static void invalidate_dquots(struct super_block
*sb
, int type
)
415 struct dquot
*dquot
, *tmp
;
418 spin_lock(&dq_list_lock
);
419 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
420 if (dquot
->dq_sb
!= sb
)
422 if (dquot
->dq_type
!= type
)
424 /* Wait for dquot users */
425 if (atomic_read(&dquot
->dq_count
)) {
428 atomic_inc(&dquot
->dq_count
);
429 prepare_to_wait(&dquot
->dq_wait_unused
, &wait
,
430 TASK_UNINTERRUPTIBLE
);
431 spin_unlock(&dq_list_lock
);
432 /* Once dqput() wakes us up, we know it's time to free
434 * IMPORTANT: we rely on the fact that there is always
435 * at most one process waiting for dquot to free.
436 * Otherwise dq_count would be > 1 and we would never
439 if (atomic_read(&dquot
->dq_count
) > 1)
441 finish_wait(&dquot
->dq_wait_unused
, &wait
);
443 /* At this moment dquot() need not exist (it could be
444 * reclaimed by prune_dqcache(). Hence we must
449 * Quota now has no users and it has been written on last
452 remove_dquot_hash(dquot
);
453 remove_free_dquot(dquot
);
455 kmem_cache_free(dquot_cachep
, dquot
);
457 spin_unlock(&dq_list_lock
);
460 int vfs_quota_sync(struct super_block
*sb
, int type
)
462 struct list_head
*dirty
;
464 struct quota_info
*dqopt
= sb_dqopt(sb
);
467 down(&dqopt
->dqonoff_sem
);
468 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
469 if (type
!= -1 && cnt
!= type
)
471 if (!sb_has_quota_enabled(sb
, cnt
))
473 spin_lock(&dq_list_lock
);
474 dirty
= &dqopt
->info
[cnt
].dqi_dirty_list
;
475 while (!list_empty(dirty
)) {
476 dquot
= list_entry(dirty
->next
, struct dquot
, dq_dirty
);
477 /* Dirty and inactive can be only bad dquot... */
478 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
479 clear_dquot_dirty(dquot
);
482 /* Now we have active dquot from which someone is
483 * holding reference so we can safely just increase
485 atomic_inc(&dquot
->dq_count
);
487 spin_unlock(&dq_list_lock
);
488 sb
->dq_op
->write_dquot(dquot
);
490 spin_lock(&dq_list_lock
);
492 spin_unlock(&dq_list_lock
);
495 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
496 if ((cnt
== type
|| type
== -1) && sb_has_quota_enabled(sb
, cnt
)
497 && info_dirty(&dqopt
->info
[cnt
]))
498 sb
->dq_op
->write_info(sb
, cnt
);
499 spin_lock(&dq_list_lock
);
501 spin_unlock(&dq_list_lock
);
502 up(&dqopt
->dqonoff_sem
);
507 /* Free unused dquots from cache */
508 static void prune_dqcache(int count
)
510 struct list_head
*head
;
513 head
= free_dquots
.prev
;
514 while (head
!= &free_dquots
&& count
) {
515 dquot
= list_entry(head
, struct dquot
, dq_free
);
516 remove_dquot_hash(dquot
);
517 remove_free_dquot(dquot
);
519 kmem_cache_free(dquot_cachep
, dquot
);
521 head
= free_dquots
.prev
;
526 * This is called from kswapd when we think we need some
530 static int shrink_dqcache_memory(int nr
, gfp_t gfp_mask
)
533 spin_lock(&dq_list_lock
);
535 spin_unlock(&dq_list_lock
);
537 return (dqstats
.free_dquots
/ 100) * sysctl_vfs_cache_pressure
;
541 * Put reference to dquot
542 * NOTE: If you change this function please check whether dqput_blocks() works right...
543 * MUST be called with either dqptr_sem or dqonoff_sem held
545 static void dqput(struct dquot
*dquot
)
549 #ifdef __DQUOT_PARANOIA
550 if (!atomic_read(&dquot
->dq_count
)) {
551 printk("VFS: dqput: trying to free free dquot\n");
552 printk("VFS: device %s, dquot of %s %d\n",
554 quotatypes
[dquot
->dq_type
],
560 spin_lock(&dq_list_lock
);
562 spin_unlock(&dq_list_lock
);
564 spin_lock(&dq_list_lock
);
565 if (atomic_read(&dquot
->dq_count
) > 1) {
566 /* We have more than one user... nothing to do */
567 atomic_dec(&dquot
->dq_count
);
568 /* Releasing dquot during quotaoff phase? */
569 if (!sb_has_quota_enabled(dquot
->dq_sb
, dquot
->dq_type
) &&
570 atomic_read(&dquot
->dq_count
) == 1)
571 wake_up(&dquot
->dq_wait_unused
);
572 spin_unlock(&dq_list_lock
);
575 /* Need to release dquot? */
576 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && dquot_dirty(dquot
)) {
577 spin_unlock(&dq_list_lock
);
578 /* Commit dquot before releasing */
579 dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
582 /* Clear flag in case dquot was inactive (something bad happened) */
583 clear_dquot_dirty(dquot
);
584 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
585 spin_unlock(&dq_list_lock
);
586 dquot
->dq_sb
->dq_op
->release_dquot(dquot
);
589 atomic_dec(&dquot
->dq_count
);
590 #ifdef __DQUOT_PARANOIA
592 if (!list_empty(&dquot
->dq_free
))
595 put_dquot_last(dquot
);
596 spin_unlock(&dq_list_lock
);
599 static struct dquot
*get_empty_dquot(struct super_block
*sb
, int type
)
603 dquot
= kmem_cache_alloc(dquot_cachep
, SLAB_NOFS
);
607 memset((caddr_t
)dquot
, 0, sizeof(struct dquot
));
608 sema_init(&dquot
->dq_lock
, 1);
609 INIT_LIST_HEAD(&dquot
->dq_free
);
610 INIT_LIST_HEAD(&dquot
->dq_inuse
);
611 INIT_HLIST_NODE(&dquot
->dq_hash
);
612 INIT_LIST_HEAD(&dquot
->dq_dirty
);
613 init_waitqueue_head(&dquot
->dq_wait_unused
);
615 dquot
->dq_type
= type
;
616 atomic_set(&dquot
->dq_count
, 1);
622 * Get reference to dquot
623 * MUST be called with either dqptr_sem or dqonoff_sem held
625 static struct dquot
*dqget(struct super_block
*sb
, unsigned int id
, int type
)
627 unsigned int hashent
= hashfn(sb
, id
, type
);
628 struct dquot
*dquot
, *empty
= NODQUOT
;
630 if (!sb_has_quota_enabled(sb
, type
))
633 spin_lock(&dq_list_lock
);
634 if ((dquot
= find_dquot(hashent
, sb
, id
, type
)) == NODQUOT
) {
635 if (empty
== NODQUOT
) {
636 spin_unlock(&dq_list_lock
);
637 if ((empty
= get_empty_dquot(sb
, type
)) == NODQUOT
)
638 schedule(); /* Try to wait for a moment... */
643 /* all dquots go on the inuse_list */
645 /* hash it first so it can be found */
646 insert_dquot_hash(dquot
);
648 spin_unlock(&dq_list_lock
);
650 if (!atomic_read(&dquot
->dq_count
))
651 remove_free_dquot(dquot
);
652 atomic_inc(&dquot
->dq_count
);
653 dqstats
.cache_hits
++;
655 spin_unlock(&dq_list_lock
);
657 kmem_cache_free(dquot_cachep
, empty
);
659 /* Wait for dq_lock - after this we know that either dquot_release() is already
660 * finished or it will be canceled due to dq_count > 1 test */
661 wait_on_dquot(dquot
);
662 /* Read the dquot and instantiate it (everything done only if needed) */
663 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && sb
->dq_op
->acquire_dquot(dquot
) < 0) {
667 #ifdef __DQUOT_PARANOIA
668 if (!dquot
->dq_sb
) /* Has somebody invalidated entry under us? */
675 static int dqinit_needed(struct inode
*inode
, int type
)
679 if (IS_NOQUOTA(inode
))
682 return inode
->i_dquot
[type
] == NODQUOT
;
683 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
684 if (inode
->i_dquot
[cnt
] == NODQUOT
)
689 /* This routine is guarded by dqonoff_sem semaphore */
690 static void add_dquot_ref(struct super_block
*sb
, int type
)
696 list_for_each(p
, &sb
->s_files
) {
697 struct file
*filp
= list_entry(p
, struct file
, f_u
.fu_list
);
698 struct inode
*inode
= filp
->f_dentry
->d_inode
;
699 if (filp
->f_mode
& FMODE_WRITE
&& dqinit_needed(inode
, type
)) {
700 struct dentry
*dentry
= dget(filp
->f_dentry
);
702 sb
->dq_op
->initialize(inode
, type
);
704 /* As we may have blocked we had better restart... */
711 /* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */
712 static inline int dqput_blocks(struct dquot
*dquot
)
714 if (atomic_read(&dquot
->dq_count
) <= 1)
719 /* Remove references to dquots from inode - add dquot to list for freeing if needed */
720 /* We can't race with anybody because we hold dqptr_sem for writing... */
721 int remove_inode_dquot_ref(struct inode
*inode
, int type
, struct list_head
*tofree_head
)
723 struct dquot
*dquot
= inode
->i_dquot
[type
];
725 inode
->i_dquot
[type
] = NODQUOT
;
726 if (dquot
!= NODQUOT
) {
727 if (dqput_blocks(dquot
)) {
728 #ifdef __DQUOT_PARANOIA
729 if (atomic_read(&dquot
->dq_count
) != 1)
730 printk(KERN_WARNING
"VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot
->dq_count
));
732 spin_lock(&dq_list_lock
);
733 list_add(&dquot
->dq_free
, tofree_head
); /* As dquot must have currently users it can't be on the free list... */
734 spin_unlock(&dq_list_lock
);
738 dqput(dquot
); /* We have guaranteed we won't block */
743 /* Free list of dquots - called from inode.c */
744 /* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */
745 static void put_dquot_list(struct list_head
*tofree_head
)
747 struct list_head
*act_head
;
750 act_head
= tofree_head
->next
;
751 /* So now we have dquots on the list... Just free them */
752 while (act_head
!= tofree_head
) {
753 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
754 act_head
= act_head
->next
;
755 list_del_init(&dquot
->dq_free
); /* Remove dquot from the list so we won't have problems... */
760 /* Gather all references from inodes and drop them */
761 static void drop_dquot_ref(struct super_block
*sb
, int type
)
763 LIST_HEAD(tofree_head
);
765 down_write(&sb_dqopt(sb
)->dqptr_sem
);
766 remove_dquot_ref(sb
, type
, &tofree_head
);
767 up_write(&sb_dqopt(sb
)->dqptr_sem
);
768 put_dquot_list(&tofree_head
);
771 static inline void dquot_incr_inodes(struct dquot
*dquot
, unsigned long number
)
773 dquot
->dq_dqb
.dqb_curinodes
+= number
;
776 static inline void dquot_incr_space(struct dquot
*dquot
, qsize_t number
)
778 dquot
->dq_dqb
.dqb_curspace
+= number
;
781 static inline void dquot_decr_inodes(struct dquot
*dquot
, unsigned long number
)
783 if (dquot
->dq_dqb
.dqb_curinodes
> number
)
784 dquot
->dq_dqb
.dqb_curinodes
-= number
;
786 dquot
->dq_dqb
.dqb_curinodes
= 0;
787 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
788 dquot
->dq_dqb
.dqb_itime
= (time_t) 0;
789 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
792 static inline void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
794 if (dquot
->dq_dqb
.dqb_curspace
> number
)
795 dquot
->dq_dqb
.dqb_curspace
-= number
;
797 dquot
->dq_dqb
.dqb_curspace
= 0;
798 if (toqb(dquot
->dq_dqb
.dqb_curspace
) <= dquot
->dq_dqb
.dqb_bsoftlimit
)
799 dquot
->dq_dqb
.dqb_btime
= (time_t) 0;
800 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
803 static int flag_print_warnings
= 1;
805 static inline int need_print_warning(struct dquot
*dquot
)
807 if (!flag_print_warnings
)
810 switch (dquot
->dq_type
) {
812 return current
->fsuid
== dquot
->dq_id
;
814 return in_group_p(dquot
->dq_id
);
819 /* Values of warnings */
822 #define ISOFTLONGWARN 2
825 #define BSOFTLONGWARN 5
828 /* Print warning to user which exceeded quota */
829 static void print_warning(struct dquot
*dquot
, const char warntype
)
832 int flag
= (warntype
== BHARDWARN
|| warntype
== BSOFTLONGWARN
) ? DQ_BLKS_B
:
833 ((warntype
== IHARDWARN
|| warntype
== ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
835 if (!need_print_warning(dquot
) || (flag
&& test_and_set_bit(flag
, &dquot
->dq_flags
)))
838 tty_write_message(current
->signal
->tty
, dquot
->dq_sb
->s_id
);
839 if (warntype
== ISOFTWARN
|| warntype
== BSOFTWARN
)
840 tty_write_message(current
->signal
->tty
, ": warning, ");
842 tty_write_message(current
->signal
->tty
, ": write failed, ");
843 tty_write_message(current
->signal
->tty
, quotatypes
[dquot
->dq_type
]);
846 msg
= " file limit reached.\r\n";
849 msg
= " file quota exceeded too long.\r\n";
852 msg
= " file quota exceeded.\r\n";
855 msg
= " block limit reached.\r\n";
858 msg
= " block quota exceeded too long.\r\n";
861 msg
= " block quota exceeded.\r\n";
864 tty_write_message(current
->signal
->tty
, msg
);
867 static inline void flush_warnings(struct dquot
**dquots
, char *warntype
)
871 for (i
= 0; i
< MAXQUOTAS
; i
++)
872 if (dquots
[i
] != NODQUOT
&& warntype
[i
] != NOWARN
)
873 print_warning(dquots
[i
], warntype
[i
]);
876 static inline char ignore_hardlimit(struct dquot
*dquot
)
878 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
880 return capable(CAP_SYS_RESOURCE
) &&
881 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
|| !(info
->dqi_flags
& V1_DQF_RSQUASH
));
884 /* needs dq_data_lock */
885 static int check_idq(struct dquot
*dquot
, ulong inodes
, char *warntype
)
888 if (inodes
<= 0 || test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
891 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
892 (dquot
->dq_dqb
.dqb_curinodes
+ inodes
) > dquot
->dq_dqb
.dqb_ihardlimit
&&
893 !ignore_hardlimit(dquot
)) {
894 *warntype
= IHARDWARN
;
898 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
899 (dquot
->dq_dqb
.dqb_curinodes
+ inodes
) > dquot
->dq_dqb
.dqb_isoftlimit
&&
900 dquot
->dq_dqb
.dqb_itime
&& get_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
901 !ignore_hardlimit(dquot
)) {
902 *warntype
= ISOFTLONGWARN
;
906 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
907 (dquot
->dq_dqb
.dqb_curinodes
+ inodes
) > dquot
->dq_dqb
.dqb_isoftlimit
&&
908 dquot
->dq_dqb
.dqb_itime
== 0) {
909 *warntype
= ISOFTWARN
;
910 dquot
->dq_dqb
.dqb_itime
= get_seconds() + sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_igrace
;
916 /* needs dq_data_lock */
917 static int check_bdq(struct dquot
*dquot
, qsize_t space
, int prealloc
, char *warntype
)
920 if (space
<= 0 || test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
923 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
924 toqb(dquot
->dq_dqb
.dqb_curspace
+ space
) > dquot
->dq_dqb
.dqb_bhardlimit
&&
925 !ignore_hardlimit(dquot
)) {
927 *warntype
= BHARDWARN
;
931 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
932 toqb(dquot
->dq_dqb
.dqb_curspace
+ space
) > dquot
->dq_dqb
.dqb_bsoftlimit
&&
933 dquot
->dq_dqb
.dqb_btime
&& get_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
934 !ignore_hardlimit(dquot
)) {
936 *warntype
= BSOFTLONGWARN
;
940 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
941 toqb(dquot
->dq_dqb
.dqb_curspace
+ space
) > dquot
->dq_dqb
.dqb_bsoftlimit
&&
942 dquot
->dq_dqb
.dqb_btime
== 0) {
944 *warntype
= BSOFTWARN
;
945 dquot
->dq_dqb
.dqb_btime
= get_seconds() + sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_bgrace
;
949 * We don't allow preallocation to exceed softlimit so exceeding will
959 * Initialize quota pointers in inode
960 * Transaction must be started at entry
962 int dquot_initialize(struct inode
*inode
, int type
)
967 /* First test before acquiring semaphore - solves deadlocks when we
968 * re-enter the quota code and are already holding the semaphore */
969 if (IS_NOQUOTA(inode
))
971 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
972 /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
973 if (IS_NOQUOTA(inode
))
975 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
976 if (type
!= -1 && cnt
!= type
)
978 if (inode
->i_dquot
[cnt
] == NODQUOT
) {
987 inode
->i_dquot
[cnt
] = dqget(inode
->i_sb
, id
, cnt
);
991 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
996 * Release all quotas referenced by inode
997 * Transaction must be started at an entry
999 int dquot_drop(struct inode
*inode
)
1003 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1004 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1005 if (inode
->i_dquot
[cnt
] != NODQUOT
) {
1006 dqput(inode
->i_dquot
[cnt
]);
1007 inode
->i_dquot
[cnt
] = NODQUOT
;
1010 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1015 * Following four functions update i_blocks+i_bytes fields and
1016 * quota information (together with appropriate checks)
1017 * NOTE: We absolutely rely on the fact that caller dirties
1018 * the inode (usually macros in quotaops.h care about this) and
1019 * holds a handle for the current transaction so that dquot write and
1020 * inode write go into the same transaction.
1024 * This operation can block, but only after everything is updated
1026 int dquot_alloc_space(struct inode
*inode
, qsize_t number
, int warn
)
1028 int cnt
, ret
= NO_QUOTA
;
1029 char warntype
[MAXQUOTAS
];
1031 /* First test before acquiring semaphore - solves deadlocks when we
1032 * re-enter the quota code and are already holding the semaphore */
1033 if (IS_NOQUOTA(inode
)) {
1035 inode_add_bytes(inode
, number
);
1038 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1039 warntype
[cnt
] = NOWARN
;
1041 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1042 if (IS_NOQUOTA(inode
)) { /* Now we can do reliable test... */
1043 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1046 spin_lock(&dq_data_lock
);
1047 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1048 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1050 if (check_bdq(inode
->i_dquot
[cnt
], number
, warn
, warntype
+cnt
) == NO_QUOTA
)
1053 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1054 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1056 dquot_incr_space(inode
->i_dquot
[cnt
], number
);
1058 inode_add_bytes(inode
, number
);
1061 spin_unlock(&dq_data_lock
);
1062 if (ret
== QUOTA_OK
)
1063 /* Dirtify all the dquots - this can block when journalling */
1064 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1065 if (inode
->i_dquot
[cnt
])
1066 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1067 flush_warnings(inode
->i_dquot
, warntype
);
1068 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1073 * This operation can block, but only after everything is updated
1075 int dquot_alloc_inode(const struct inode
*inode
, unsigned long number
)
1077 int cnt
, ret
= NO_QUOTA
;
1078 char warntype
[MAXQUOTAS
];
1080 /* First test before acquiring semaphore - solves deadlocks when we
1081 * re-enter the quota code and are already holding the semaphore */
1082 if (IS_NOQUOTA(inode
))
1084 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1085 warntype
[cnt
] = NOWARN
;
1086 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1087 if (IS_NOQUOTA(inode
)) {
1088 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1091 spin_lock(&dq_data_lock
);
1092 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1093 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1095 if (check_idq(inode
->i_dquot
[cnt
], number
, warntype
+cnt
) == NO_QUOTA
)
1099 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1100 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1102 dquot_incr_inodes(inode
->i_dquot
[cnt
], number
);
1106 spin_unlock(&dq_data_lock
);
1107 if (ret
== QUOTA_OK
)
1108 /* Dirtify all the dquots - this can block when journalling */
1109 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1110 if (inode
->i_dquot
[cnt
])
1111 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1112 flush_warnings((struct dquot
**)inode
->i_dquot
, warntype
);
1113 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1118 * This operation can block, but only after everything is updated
1120 int dquot_free_space(struct inode
*inode
, qsize_t number
)
1124 /* First test before acquiring semaphore - solves deadlocks when we
1125 * re-enter the quota code and are already holding the semaphore */
1126 if (IS_NOQUOTA(inode
)) {
1128 inode_sub_bytes(inode
, number
);
1131 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1132 /* Now recheck reliably when holding dqptr_sem */
1133 if (IS_NOQUOTA(inode
)) {
1134 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1137 spin_lock(&dq_data_lock
);
1138 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1139 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1141 dquot_decr_space(inode
->i_dquot
[cnt
], number
);
1143 inode_sub_bytes(inode
, number
);
1144 spin_unlock(&dq_data_lock
);
1145 /* Dirtify all the dquots - this can block when journalling */
1146 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1147 if (inode
->i_dquot
[cnt
])
1148 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1149 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1154 * This operation can block, but only after everything is updated
1156 int dquot_free_inode(const struct inode
*inode
, unsigned long number
)
1160 /* First test before acquiring semaphore - solves deadlocks when we
1161 * re-enter the quota code and are already holding the semaphore */
1162 if (IS_NOQUOTA(inode
))
1164 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1165 /* Now recheck reliably when holding dqptr_sem */
1166 if (IS_NOQUOTA(inode
)) {
1167 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1170 spin_lock(&dq_data_lock
);
1171 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1172 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1174 dquot_decr_inodes(inode
->i_dquot
[cnt
], number
);
1176 spin_unlock(&dq_data_lock
);
1177 /* Dirtify all the dquots - this can block when journalling */
1178 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1179 if (inode
->i_dquot
[cnt
])
1180 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1181 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1186 * Transfer the number of inode and blocks from one diskquota to an other.
1188 * This operation can block, but only after everything is updated
1189 * A transaction must be started when entering this function.
1191 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
1194 struct dquot
*transfer_from
[MAXQUOTAS
];
1195 struct dquot
*transfer_to
[MAXQUOTAS
];
1196 int cnt
, ret
= NO_QUOTA
, chuid
= (iattr
->ia_valid
& ATTR_UID
) && inode
->i_uid
!= iattr
->ia_uid
,
1197 chgid
= (iattr
->ia_valid
& ATTR_GID
) && inode
->i_gid
!= iattr
->ia_gid
;
1198 char warntype
[MAXQUOTAS
];
1200 /* First test before acquiring semaphore - solves deadlocks when we
1201 * re-enter the quota code and are already holding the semaphore */
1202 if (IS_NOQUOTA(inode
))
1204 /* Clear the arrays */
1205 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1206 transfer_to
[cnt
] = transfer_from
[cnt
] = NODQUOT
;
1207 warntype
[cnt
] = NOWARN
;
1209 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1210 /* Now recheck reliably when holding dqptr_sem */
1211 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1212 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1215 /* First build the transfer_to list - here we can block on
1216 * reading/instantiating of dquots. We know that the transaction for
1217 * us was already started so we don't violate lock ranking here */
1218 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1223 transfer_to
[cnt
] = dqget(inode
->i_sb
, iattr
->ia_uid
, cnt
);
1228 transfer_to
[cnt
] = dqget(inode
->i_sb
, iattr
->ia_gid
, cnt
);
1232 spin_lock(&dq_data_lock
);
1233 space
= inode_get_bytes(inode
);
1234 /* Build the transfer_from list and check the limits */
1235 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1236 if (transfer_to
[cnt
] == NODQUOT
)
1238 transfer_from
[cnt
] = inode
->i_dquot
[cnt
];
1239 if (check_idq(transfer_to
[cnt
], 1, warntype
+cnt
) == NO_QUOTA
||
1240 check_bdq(transfer_to
[cnt
], space
, 0, warntype
+cnt
) == NO_QUOTA
)
1245 * Finally perform the needed transfer from transfer_from to transfer_to
1247 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1249 * Skip changes for same uid or gid or for turned off quota-type.
1251 if (transfer_to
[cnt
] == NODQUOT
)
1254 /* Due to IO error we might not have transfer_from[] structure */
1255 if (transfer_from
[cnt
]) {
1256 dquot_decr_inodes(transfer_from
[cnt
], 1);
1257 dquot_decr_space(transfer_from
[cnt
], space
);
1260 dquot_incr_inodes(transfer_to
[cnt
], 1);
1261 dquot_incr_space(transfer_to
[cnt
], space
);
1263 inode
->i_dquot
[cnt
] = transfer_to
[cnt
];
1267 spin_unlock(&dq_data_lock
);
1268 /* Dirtify all the dquots - this can block when journalling */
1269 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1270 if (transfer_from
[cnt
])
1271 mark_dquot_dirty(transfer_from
[cnt
]);
1272 if (transfer_to
[cnt
])
1273 mark_dquot_dirty(transfer_to
[cnt
]);
1275 flush_warnings(transfer_to
, warntype
);
1277 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1278 if (ret
== QUOTA_OK
&& transfer_from
[cnt
] != NODQUOT
)
1279 dqput(transfer_from
[cnt
]);
1280 if (ret
== NO_QUOTA
&& transfer_to
[cnt
] != NODQUOT
)
1281 dqput(transfer_to
[cnt
]);
1283 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1288 * Write info of quota file to disk
1290 int dquot_commit_info(struct super_block
*sb
, int type
)
1293 struct quota_info
*dqopt
= sb_dqopt(sb
);
1295 down(&dqopt
->dqio_sem
);
1296 ret
= dqopt
->ops
[type
]->write_file_info(sb
, type
);
1297 up(&dqopt
->dqio_sem
);
1302 * Definitions of diskquota operations.
1304 struct dquot_operations dquot_operations
= {
1305 .initialize
= dquot_initialize
,
1307 .alloc_space
= dquot_alloc_space
,
1308 .alloc_inode
= dquot_alloc_inode
,
1309 .free_space
= dquot_free_space
,
1310 .free_inode
= dquot_free_inode
,
1311 .transfer
= dquot_transfer
,
1312 .write_dquot
= dquot_commit
,
1313 .acquire_dquot
= dquot_acquire
,
1314 .release_dquot
= dquot_release
,
1315 .mark_dirty
= dquot_mark_dquot_dirty
,
1316 .write_info
= dquot_commit_info
1319 static inline void set_enable_flags(struct quota_info
*dqopt
, int type
)
1323 dqopt
->flags
|= DQUOT_USR_ENABLED
;
1326 dqopt
->flags
|= DQUOT_GRP_ENABLED
;
1331 static inline void reset_enable_flags(struct quota_info
*dqopt
, int type
)
1335 dqopt
->flags
&= ~DQUOT_USR_ENABLED
;
1338 dqopt
->flags
&= ~DQUOT_GRP_ENABLED
;
1344 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1346 int vfs_quota_off(struct super_block
*sb
, int type
)
1349 struct quota_info
*dqopt
= sb_dqopt(sb
);
1350 struct inode
*toputinode
[MAXQUOTAS
];
1352 /* We need to serialize quota_off() for device */
1353 down(&dqopt
->dqonoff_sem
);
1354 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1355 toputinode
[cnt
] = NULL
;
1356 if (type
!= -1 && cnt
!= type
)
1358 if (!sb_has_quota_enabled(sb
, cnt
))
1360 reset_enable_flags(dqopt
, cnt
);
1362 /* Note: these are blocking operations */
1363 drop_dquot_ref(sb
, cnt
);
1364 invalidate_dquots(sb
, cnt
);
1366 * Now all dquots should be invalidated, all writes done so we should be only
1367 * users of the info. No locks needed.
1369 if (info_dirty(&dqopt
->info
[cnt
]))
1370 sb
->dq_op
->write_info(sb
, cnt
);
1371 if (dqopt
->ops
[cnt
]->free_file_info
)
1372 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
1373 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
1375 toputinode
[cnt
] = dqopt
->files
[cnt
];
1376 dqopt
->files
[cnt
] = NULL
;
1377 dqopt
->info
[cnt
].dqi_flags
= 0;
1378 dqopt
->info
[cnt
].dqi_igrace
= 0;
1379 dqopt
->info
[cnt
].dqi_bgrace
= 0;
1380 dqopt
->ops
[cnt
] = NULL
;
1382 up(&dqopt
->dqonoff_sem
);
1383 /* Sync the superblock so that buffers with quota data are written to
1384 * disk (and so userspace sees correct data afterwards). */
1385 if (sb
->s_op
->sync_fs
)
1386 sb
->s_op
->sync_fs(sb
, 1);
1387 sync_blockdev(sb
->s_bdev
);
1388 /* Now the quota files are just ordinary files and we can set the
1389 * inode flags back. Moreover we discard the pagecache so that
1390 * userspace sees the writes we did bypassing the pagecache. We
1391 * must also discard the blockdev buffers so that we see the
1392 * changes done by userspace on the next quotaon() */
1393 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1394 if (toputinode
[cnt
]) {
1395 down(&dqopt
->dqonoff_sem
);
1396 /* If quota was reenabled in the meantime, we have
1398 if (!sb_has_quota_enabled(sb
, cnt
)) {
1399 mutex_lock(&toputinode
[cnt
]->i_mutex
);
1400 toputinode
[cnt
]->i_flags
&= ~(S_IMMUTABLE
|
1401 S_NOATIME
| S_NOQUOTA
);
1402 truncate_inode_pages(&toputinode
[cnt
]->i_data
, 0);
1403 mutex_unlock(&toputinode
[cnt
]->i_mutex
);
1404 mark_inode_dirty(toputinode
[cnt
]);
1405 iput(toputinode
[cnt
]);
1407 up(&dqopt
->dqonoff_sem
);
1410 invalidate_bdev(sb
->s_bdev
, 0);
1415 * Turn quotas on on a device
1418 /* Helper function when we already have the inode */
1419 static int vfs_quota_on_inode(struct inode
*inode
, int type
, int format_id
)
1421 struct quota_format_type
*fmt
= find_quota_format(format_id
);
1422 struct super_block
*sb
= inode
->i_sb
;
1423 struct quota_info
*dqopt
= sb_dqopt(sb
);
1429 if (!S_ISREG(inode
->i_mode
)) {
1433 if (IS_RDONLY(inode
)) {
1437 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
) {
1442 /* As we bypass the pagecache we must now flush the inode so that
1443 * we see all the changes from userspace... */
1444 write_inode_now(inode
, 1);
1445 /* And now flush the block cache so that kernel sees the changes */
1446 invalidate_bdev(sb
->s_bdev
, 0);
1447 mutex_lock(&inode
->i_mutex
);
1448 down(&dqopt
->dqonoff_sem
);
1449 if (sb_has_quota_enabled(sb
, type
)) {
1453 /* We don't want quota and atime on quota files (deadlocks possible)
1454 * Also nobody should write to the file - we use special IO operations
1455 * which ignore the immutable bit. */
1456 down_write(&dqopt
->dqptr_sem
);
1457 oldflags
= inode
->i_flags
& (S_NOATIME
| S_IMMUTABLE
| S_NOQUOTA
);
1458 inode
->i_flags
|= S_NOQUOTA
| S_NOATIME
| S_IMMUTABLE
;
1459 up_write(&dqopt
->dqptr_sem
);
1460 sb
->dq_op
->drop(inode
);
1463 dqopt
->files
[type
] = igrab(inode
);
1464 if (!dqopt
->files
[type
])
1467 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
1470 dqopt
->ops
[type
] = fmt
->qf_ops
;
1471 dqopt
->info
[type
].dqi_format
= fmt
;
1472 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
1473 down(&dqopt
->dqio_sem
);
1474 if ((error
= dqopt
->ops
[type
]->read_file_info(sb
, type
)) < 0) {
1475 up(&dqopt
->dqio_sem
);
1478 up(&dqopt
->dqio_sem
);
1479 mutex_unlock(&inode
->i_mutex
);
1480 set_enable_flags(dqopt
, type
);
1482 add_dquot_ref(sb
, type
);
1483 up(&dqopt
->dqonoff_sem
);
1488 dqopt
->files
[type
] = NULL
;
1491 up(&dqopt
->dqonoff_sem
);
1492 if (oldflags
!= -1) {
1493 down_write(&dqopt
->dqptr_sem
);
1494 /* Set the flags back (in the case of accidental quotaon()
1495 * on a wrong file we don't want to mess up the flags) */
1496 inode
->i_flags
&= ~(S_NOATIME
| S_NOQUOTA
| S_IMMUTABLE
);
1497 inode
->i_flags
|= oldflags
;
1498 up_write(&dqopt
->dqptr_sem
);
1500 mutex_unlock(&inode
->i_mutex
);
1502 put_quota_format(fmt
);
1507 /* Actual function called from quotactl() */
1508 int vfs_quota_on(struct super_block
*sb
, int type
, int format_id
, char *path
)
1510 struct nameidata nd
;
1513 error
= path_lookup(path
, LOOKUP_FOLLOW
, &nd
);
1516 error
= security_quota_on(nd
.dentry
);
1519 /* Quota file not on the same filesystem? */
1520 if (nd
.mnt
->mnt_sb
!= sb
)
1523 error
= vfs_quota_on_inode(nd
.dentry
->d_inode
, type
, format_id
);
1530 * This function is used when filesystem needs to initialize quotas
1531 * during mount time.
1533 int vfs_quota_on_mount(struct super_block
*sb
, char *qf_name
,
1534 int format_id
, int type
)
1536 struct dentry
*dentry
;
1539 dentry
= lookup_one_len(qf_name
, sb
->s_root
, strlen(qf_name
));
1541 return PTR_ERR(dentry
);
1543 if (!dentry
->d_inode
) {
1548 error
= security_quota_on(dentry
);
1550 error
= vfs_quota_on_inode(dentry
->d_inode
, type
, format_id
);
1557 /* Generic routine for getting common part of quota structure */
1558 static void do_get_dqblk(struct dquot
*dquot
, struct if_dqblk
*di
)
1560 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
1562 spin_lock(&dq_data_lock
);
1563 di
->dqb_bhardlimit
= dm
->dqb_bhardlimit
;
1564 di
->dqb_bsoftlimit
= dm
->dqb_bsoftlimit
;
1565 di
->dqb_curspace
= dm
->dqb_curspace
;
1566 di
->dqb_ihardlimit
= dm
->dqb_ihardlimit
;
1567 di
->dqb_isoftlimit
= dm
->dqb_isoftlimit
;
1568 di
->dqb_curinodes
= dm
->dqb_curinodes
;
1569 di
->dqb_btime
= dm
->dqb_btime
;
1570 di
->dqb_itime
= dm
->dqb_itime
;
1571 di
->dqb_valid
= QIF_ALL
;
1572 spin_unlock(&dq_data_lock
);
1575 int vfs_get_dqblk(struct super_block
*sb
, int type
, qid_t id
, struct if_dqblk
*di
)
1577 struct dquot
*dquot
;
1579 down(&sb_dqopt(sb
)->dqonoff_sem
);
1580 if (!(dquot
= dqget(sb
, id
, type
))) {
1581 up(&sb_dqopt(sb
)->dqonoff_sem
);
1584 do_get_dqblk(dquot
, di
);
1586 up(&sb_dqopt(sb
)->dqonoff_sem
);
1590 /* Generic routine for setting common part of quota structure */
1591 static void do_set_dqblk(struct dquot
*dquot
, struct if_dqblk
*di
)
1593 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
1594 int check_blim
= 0, check_ilim
= 0;
1596 spin_lock(&dq_data_lock
);
1597 if (di
->dqb_valid
& QIF_SPACE
) {
1598 dm
->dqb_curspace
= di
->dqb_curspace
;
1601 if (di
->dqb_valid
& QIF_BLIMITS
) {
1602 dm
->dqb_bsoftlimit
= di
->dqb_bsoftlimit
;
1603 dm
->dqb_bhardlimit
= di
->dqb_bhardlimit
;
1606 if (di
->dqb_valid
& QIF_INODES
) {
1607 dm
->dqb_curinodes
= di
->dqb_curinodes
;
1610 if (di
->dqb_valid
& QIF_ILIMITS
) {
1611 dm
->dqb_isoftlimit
= di
->dqb_isoftlimit
;
1612 dm
->dqb_ihardlimit
= di
->dqb_ihardlimit
;
1615 if (di
->dqb_valid
& QIF_BTIME
)
1616 dm
->dqb_btime
= di
->dqb_btime
;
1617 if (di
->dqb_valid
& QIF_ITIME
)
1618 dm
->dqb_itime
= di
->dqb_itime
;
1621 if (!dm
->dqb_bsoftlimit
|| toqb(dm
->dqb_curspace
) < dm
->dqb_bsoftlimit
) {
1623 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
1625 else if (!(di
->dqb_valid
& QIF_BTIME
)) /* Set grace only if user hasn't provided his own... */
1626 dm
->dqb_btime
= get_seconds() + sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_bgrace
;
1629 if (!dm
->dqb_isoftlimit
|| dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
1631 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
1633 else if (!(di
->dqb_valid
& QIF_ITIME
)) /* Set grace only if user hasn't provided his own... */
1634 dm
->dqb_itime
= get_seconds() + sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_igrace
;
1636 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
|| dm
->dqb_isoftlimit
)
1637 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
1639 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
1640 spin_unlock(&dq_data_lock
);
1641 mark_dquot_dirty(dquot
);
1644 int vfs_set_dqblk(struct super_block
*sb
, int type
, qid_t id
, struct if_dqblk
*di
)
1646 struct dquot
*dquot
;
1648 down(&sb_dqopt(sb
)->dqonoff_sem
);
1649 if (!(dquot
= dqget(sb
, id
, type
))) {
1650 up(&sb_dqopt(sb
)->dqonoff_sem
);
1653 do_set_dqblk(dquot
, di
);
1655 up(&sb_dqopt(sb
)->dqonoff_sem
);
1659 /* Generic routine for getting common part of quota file information */
1660 int vfs_get_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
1662 struct mem_dqinfo
*mi
;
1664 down(&sb_dqopt(sb
)->dqonoff_sem
);
1665 if (!sb_has_quota_enabled(sb
, type
)) {
1666 up(&sb_dqopt(sb
)->dqonoff_sem
);
1669 mi
= sb_dqopt(sb
)->info
+ type
;
1670 spin_lock(&dq_data_lock
);
1671 ii
->dqi_bgrace
= mi
->dqi_bgrace
;
1672 ii
->dqi_igrace
= mi
->dqi_igrace
;
1673 ii
->dqi_flags
= mi
->dqi_flags
& DQF_MASK
;
1674 ii
->dqi_valid
= IIF_ALL
;
1675 spin_unlock(&dq_data_lock
);
1676 up(&sb_dqopt(sb
)->dqonoff_sem
);
1680 /* Generic routine for setting common part of quota file information */
1681 int vfs_set_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
1683 struct mem_dqinfo
*mi
;
1685 down(&sb_dqopt(sb
)->dqonoff_sem
);
1686 if (!sb_has_quota_enabled(sb
, type
)) {
1687 up(&sb_dqopt(sb
)->dqonoff_sem
);
1690 mi
= sb_dqopt(sb
)->info
+ type
;
1691 spin_lock(&dq_data_lock
);
1692 if (ii
->dqi_valid
& IIF_BGRACE
)
1693 mi
->dqi_bgrace
= ii
->dqi_bgrace
;
1694 if (ii
->dqi_valid
& IIF_IGRACE
)
1695 mi
->dqi_igrace
= ii
->dqi_igrace
;
1696 if (ii
->dqi_valid
& IIF_FLAGS
)
1697 mi
->dqi_flags
= (mi
->dqi_flags
& ~DQF_MASK
) | (ii
->dqi_flags
& DQF_MASK
);
1698 spin_unlock(&dq_data_lock
);
1699 mark_info_dirty(sb
, type
);
1700 /* Force write to disk */
1701 sb
->dq_op
->write_info(sb
, type
);
1702 up(&sb_dqopt(sb
)->dqonoff_sem
);
1706 struct quotactl_ops vfs_quotactl_ops
= {
1707 .quota_on
= vfs_quota_on
,
1708 .quota_off
= vfs_quota_off
,
1709 .quota_sync
= vfs_quota_sync
,
1710 .get_info
= vfs_get_dqinfo
,
1711 .set_info
= vfs_set_dqinfo
,
1712 .get_dqblk
= vfs_get_dqblk
,
1713 .set_dqblk
= vfs_set_dqblk
1716 static ctl_table fs_dqstats_table
[] = {
1718 .ctl_name
= FS_DQ_LOOKUPS
,
1719 .procname
= "lookups",
1720 .data
= &dqstats
.lookups
,
1721 .maxlen
= sizeof(int),
1723 .proc_handler
= &proc_dointvec
,
1726 .ctl_name
= FS_DQ_DROPS
,
1727 .procname
= "drops",
1728 .data
= &dqstats
.drops
,
1729 .maxlen
= sizeof(int),
1731 .proc_handler
= &proc_dointvec
,
1734 .ctl_name
= FS_DQ_READS
,
1735 .procname
= "reads",
1736 .data
= &dqstats
.reads
,
1737 .maxlen
= sizeof(int),
1739 .proc_handler
= &proc_dointvec
,
1742 .ctl_name
= FS_DQ_WRITES
,
1743 .procname
= "writes",
1744 .data
= &dqstats
.writes
,
1745 .maxlen
= sizeof(int),
1747 .proc_handler
= &proc_dointvec
,
1750 .ctl_name
= FS_DQ_CACHE_HITS
,
1751 .procname
= "cache_hits",
1752 .data
= &dqstats
.cache_hits
,
1753 .maxlen
= sizeof(int),
1755 .proc_handler
= &proc_dointvec
,
1758 .ctl_name
= FS_DQ_ALLOCATED
,
1759 .procname
= "allocated_dquots",
1760 .data
= &dqstats
.allocated_dquots
,
1761 .maxlen
= sizeof(int),
1763 .proc_handler
= &proc_dointvec
,
1766 .ctl_name
= FS_DQ_FREE
,
1767 .procname
= "free_dquots",
1768 .data
= &dqstats
.free_dquots
,
1769 .maxlen
= sizeof(int),
1771 .proc_handler
= &proc_dointvec
,
1774 .ctl_name
= FS_DQ_SYNCS
,
1775 .procname
= "syncs",
1776 .data
= &dqstats
.syncs
,
1777 .maxlen
= sizeof(int),
1779 .proc_handler
= &proc_dointvec
,
1782 .ctl_name
= FS_DQ_WARNINGS
,
1783 .procname
= "warnings",
1784 .data
= &flag_print_warnings
,
1785 .maxlen
= sizeof(int),
1787 .proc_handler
= &proc_dointvec
,
1792 static ctl_table fs_table
[] = {
1794 .ctl_name
= FS_DQSTATS
,
1795 .procname
= "quota",
1797 .child
= fs_dqstats_table
,
1802 static ctl_table sys_table
[] = {
1812 static int __init
dquot_init(void)
1815 unsigned long nr_hash
, order
;
1817 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
1819 register_sysctl_table(sys_table
, 0);
1821 dquot_cachep
= kmem_cache_create("dquot",
1822 sizeof(struct dquot
), sizeof(unsigned long) * 4,
1823 SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|SLAB_PANIC
,
1827 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
1829 panic("Cannot create dquot hash table");
1831 /* Find power-of-two hlist_heads which can fit into allocation */
1832 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
1836 } while (nr_hash
>> dq_hash_bits
);
1839 nr_hash
= 1UL << dq_hash_bits
;
1840 dq_hash_mask
= nr_hash
- 1;
1841 for (i
= 0; i
< nr_hash
; i
++)
1842 INIT_HLIST_HEAD(dquot_hash
+ i
);
1844 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
1845 nr_hash
, order
, (PAGE_SIZE
<< order
));
1847 set_shrinker(DEFAULT_SEEKS
, shrink_dqcache_memory
);
1851 module_init(dquot_init
);
1853 EXPORT_SYMBOL(register_quota_format
);
1854 EXPORT_SYMBOL(unregister_quota_format
);
1855 EXPORT_SYMBOL(dqstats
);
1856 EXPORT_SYMBOL(dq_data_lock
);
1857 EXPORT_SYMBOL(vfs_quota_on
);
1858 EXPORT_SYMBOL(vfs_quota_on_mount
);
1859 EXPORT_SYMBOL(vfs_quota_off
);
1860 EXPORT_SYMBOL(vfs_quota_sync
);
1861 EXPORT_SYMBOL(vfs_get_dqinfo
);
1862 EXPORT_SYMBOL(vfs_set_dqinfo
);
1863 EXPORT_SYMBOL(vfs_get_dqblk
);
1864 EXPORT_SYMBOL(vfs_set_dqblk
);
1865 EXPORT_SYMBOL(dquot_commit
);
1866 EXPORT_SYMBOL(dquot_commit_info
);
1867 EXPORT_SYMBOL(dquot_acquire
);
1868 EXPORT_SYMBOL(dquot_release
);
1869 EXPORT_SYMBOL(dquot_mark_dquot_dirty
);
1870 EXPORT_SYMBOL(dquot_initialize
);
1871 EXPORT_SYMBOL(dquot_drop
);
1872 EXPORT_SYMBOL(dquot_alloc_space
);
1873 EXPORT_SYMBOL(dquot_alloc_inode
);
1874 EXPORT_SYMBOL(dquot_free_space
);
1875 EXPORT_SYMBOL(dquot_free_inode
);
1876 EXPORT_SYMBOL(dquot_transfer
);