2 * Implementation of the diskquota system for the LINUX operating system. QUOTA
3 * is implemented using the BSD system call interface as the means of
4 * communication with the user level. This file contains the generic routines
5 * called by the different filesystems on allocation of an inode or block.
6 * These routines take care of the administration needed to have a consistent
7 * diskquota tracking system. The ideas of both user and group quotas are based
8 * on the Melbourne quota system as used on BSD derived systems. The internal
9 * implementation is based on one of the several variants of the LINUX
10 * inode-subsystem with added complexity of the diskquota system.
12 * Author: Marco van Wieringen <mvw@planets.elm.net>
14 * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
16 * Revised list management to avoid races
17 * -- Bill Hawes, <whawes@star.net>, 9/98
19 * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
20 * As the consequence the locking was moved from dquot_decr_...(),
21 * dquot_incr_...() to calling functions.
22 * invalidate_dquots() now writes modified dquots.
23 * Serialized quota_off() and quota_on() for mount point.
24 * Fixed a few bugs in grow_dquots().
25 * Fixed deadlock in write_dquot() - we no longer account quotas on
27 * remove_dquot_ref() moved to inode.c - it now traverses through inodes
28 * add_dquot_ref() restarts after blocking
29 * Added check for bogus uid and fixed check for group in quotactl.
30 * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
32 * Used struct list_head instead of own list struct
33 * Invalidation of referenced dquots is no longer possible
34 * Improved free_dquots list management
35 * Quota and i_blocks are now updated in one place to avoid races
36 * Warnings are now delayed so we won't block in critical section
37 * Write updated not to require dquot lock
38 * Jan Kara, <jack@suse.cz>, 9/2000
40 * Added dynamic quota structure allocation
41 * Jan Kara <jack@suse.cz> 12/2000
43 * Rewritten quota interface. Implemented new quota format and
44 * formats registering.
45 * Jan Kara, <jack@suse.cz>, 2001,2002
48 * Jan Kara, <jack@suse.cz>, 10/2002
50 * Added journalled quota support, fix lock inversion problems
51 * Jan Kara, <jack@suse.cz>, 2003,2004
53 * (C) Copyright 1994 - 1997 Marco van Wieringen
56 #include <linux/errno.h>
57 #include <linux/kernel.h>
59 #include <linux/mount.h>
61 #include <linux/time.h>
62 #include <linux/types.h>
63 #include <linux/string.h>
64 #include <linux/fcntl.h>
65 #include <linux/stat.h>
66 #include <linux/tty.h>
67 #include <linux/file.h>
68 #include <linux/slab.h>
69 #include <linux/sysctl.h>
70 #include <linux/init.h>
71 #include <linux/module.h>
72 #include <linux/proc_fs.h>
73 #include <linux/security.h>
74 #include <linux/kmod.h>
75 #include <linux/namei.h>
76 #include <linux/buffer_head.h>
77 #include <linux/capability.h>
78 #include <linux/quotaops.h>
79 #include <linux/writeback.h> /* for inode_lock, oddly enough.. */
80 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
81 #include <net/netlink.h>
82 #include <net/genetlink.h>
85 #include <asm/uaccess.h>
87 #define __DQUOT_PARANOIA
90 * There are two quota SMP locks. dq_list_lock protects all lists with quotas
91 * and quota formats and also dqstats structure containing statistics about the
92 * lists. dq_data_lock protects data from dq_dqb and also mem_dqinfo structures
93 * and also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
94 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
95 * in inode_add_bytes() and inode_sub_bytes().
97 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock
99 * Note that some things (eg. sb pointer, type, id) doesn't change during
100 * the life of the dquot structure and so needn't to be protected by a lock
102 * Any operation working on dquots via inode pointers must hold dqptr_sem. If
103 * operation is just reading pointers from inode (or not using them at all) the
104 * read lock is enough. If pointers are altered function must hold write lock
105 * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
106 * for altering the flag i_mutex is also needed). If operation is holding
107 * reference to dquot in other way (e.g. quotactl ops) it must be guarded by
109 * This locking assures that:
110 * a) update/access to dquot pointers in inode is serialized
111 * b) everyone is guarded against invalidate_dquots()
113 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
114 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
115 * Currently dquot is locked only when it is being read to memory (or space for
116 * it is being allocated) on the first dqget() and when it is being released on
117 * the last dqput(). The allocation and release oparations are serialized by
118 * the dq_lock and by checking the use count in dquot_release(). Write
119 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
120 * spinlock to internal buffers before writing.
122 * Lock ordering (including related VFS locks) is the following:
123 * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
125 * i_mutex on quota files is special (it's below dqio_mutex)
128 static DEFINE_SPINLOCK(dq_list_lock
);
129 DEFINE_SPINLOCK(dq_data_lock
);
131 static char *quotatypes
[] = INITQFNAMES
;
132 static struct quota_format_type
*quota_formats
; /* List of registered formats */
133 static struct quota_module_name module_names
[] = INIT_QUOTA_MODULE_NAMES
;
135 /* SLAB cache for dquot structures */
136 static struct kmem_cache
*dquot_cachep
;
138 int register_quota_format(struct quota_format_type
*fmt
)
140 spin_lock(&dq_list_lock
);
141 fmt
->qf_next
= quota_formats
;
143 spin_unlock(&dq_list_lock
);
147 void unregister_quota_format(struct quota_format_type
*fmt
)
149 struct quota_format_type
**actqf
;
151 spin_lock(&dq_list_lock
);
152 for (actqf
= "a_formats
; *actqf
&& *actqf
!= fmt
; actqf
= &(*actqf
)->qf_next
);
154 *actqf
= (*actqf
)->qf_next
;
155 spin_unlock(&dq_list_lock
);
158 static struct quota_format_type
*find_quota_format(int id
)
160 struct quota_format_type
*actqf
;
162 spin_lock(&dq_list_lock
);
163 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
; actqf
= actqf
->qf_next
);
164 if (!actqf
|| !try_module_get(actqf
->qf_owner
)) {
167 spin_unlock(&dq_list_lock
);
169 for (qm
= 0; module_names
[qm
].qm_fmt_id
&& module_names
[qm
].qm_fmt_id
!= id
; qm
++);
170 if (!module_names
[qm
].qm_fmt_id
|| request_module(module_names
[qm
].qm_mod_name
))
173 spin_lock(&dq_list_lock
);
174 for (actqf
= quota_formats
; actqf
&& actqf
->qf_fmt_id
!= id
; actqf
= actqf
->qf_next
);
175 if (actqf
&& !try_module_get(actqf
->qf_owner
))
178 spin_unlock(&dq_list_lock
);
182 static void put_quota_format(struct quota_format_type
*fmt
)
184 module_put(fmt
->qf_owner
);
188 * Dquot List Management:
189 * The quota code uses three lists for dquot management: the inuse_list,
190 * free_dquots, and dquot_hash[] array. A single dquot structure may be
191 * on all three lists, depending on its current state.
193 * All dquots are placed to the end of inuse_list when first created, and this
194 * list is used for invalidate operation, which must look at every dquot.
196 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
197 * and this list is searched whenever we need an available dquot. Dquots are
198 * removed from the list as soon as they are used again, and
199 * dqstats.free_dquots gives the number of dquots on the list. When
200 * dquot is invalidated it's completely released from memory.
202 * Dquots with a specific identity (device, type and id) are placed on
203 * one of the dquot_hash[] hash chains. The provides an efficient search
204 * mechanism to locate a specific dquot.
207 static LIST_HEAD(inuse_list
);
208 static LIST_HEAD(free_dquots
);
209 static unsigned int dq_hash_bits
, dq_hash_mask
;
210 static struct hlist_head
*dquot_hash
;
212 struct dqstats dqstats
;
214 static void dqput(struct dquot
*dquot
);
216 static inline unsigned int
217 hashfn(const struct super_block
*sb
, unsigned int id
, int type
)
221 tmp
= (((unsigned long)sb
>>L1_CACHE_SHIFT
) ^ id
) * (MAXQUOTAS
- type
);
222 return (tmp
+ (tmp
>> dq_hash_bits
)) & dq_hash_mask
;
226 * Following list functions expect dq_list_lock to be held
228 static inline void insert_dquot_hash(struct dquot
*dquot
)
230 struct hlist_head
*head
= dquot_hash
+ hashfn(dquot
->dq_sb
, dquot
->dq_id
, dquot
->dq_type
);
231 hlist_add_head(&dquot
->dq_hash
, head
);
234 static inline void remove_dquot_hash(struct dquot
*dquot
)
236 hlist_del_init(&dquot
->dq_hash
);
239 static inline struct dquot
*find_dquot(unsigned int hashent
, struct super_block
*sb
, unsigned int id
, int type
)
241 struct hlist_node
*node
;
244 hlist_for_each (node
, dquot_hash
+hashent
) {
245 dquot
= hlist_entry(node
, struct dquot
, dq_hash
);
246 if (dquot
->dq_sb
== sb
&& dquot
->dq_id
== id
&& dquot
->dq_type
== type
)
252 /* Add a dquot to the tail of the free list */
253 static inline void put_dquot_last(struct dquot
*dquot
)
255 list_add_tail(&dquot
->dq_free
, &free_dquots
);
256 dqstats
.free_dquots
++;
259 static inline void remove_free_dquot(struct dquot
*dquot
)
261 if (list_empty(&dquot
->dq_free
))
263 list_del_init(&dquot
->dq_free
);
264 dqstats
.free_dquots
--;
267 static inline void put_inuse(struct dquot
*dquot
)
269 /* We add to the back of inuse list so we don't have to restart
270 * when traversing this list and we block */
271 list_add_tail(&dquot
->dq_inuse
, &inuse_list
);
272 dqstats
.allocated_dquots
++;
275 static inline void remove_inuse(struct dquot
*dquot
)
277 dqstats
.allocated_dquots
--;
278 list_del(&dquot
->dq_inuse
);
281 * End of list functions needing dq_list_lock
284 static void wait_on_dquot(struct dquot
*dquot
)
286 mutex_lock(&dquot
->dq_lock
);
287 mutex_unlock(&dquot
->dq_lock
);
290 static inline int dquot_dirty(struct dquot
*dquot
)
292 return test_bit(DQ_MOD_B
, &dquot
->dq_flags
);
295 static inline int mark_dquot_dirty(struct dquot
*dquot
)
297 return dquot
->dq_sb
->dq_op
->mark_dirty(dquot
);
300 int dquot_mark_dquot_dirty(struct dquot
*dquot
)
302 spin_lock(&dq_list_lock
);
303 if (!test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
))
304 list_add(&dquot
->dq_dirty
, &sb_dqopt(dquot
->dq_sb
)->
305 info
[dquot
->dq_type
].dqi_dirty_list
);
306 spin_unlock(&dq_list_lock
);
310 /* This function needs dq_list_lock */
311 static inline int clear_dquot_dirty(struct dquot
*dquot
)
313 if (!test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
))
315 list_del_init(&dquot
->dq_dirty
);
319 void mark_info_dirty(struct super_block
*sb
, int type
)
321 set_bit(DQF_INFO_DIRTY_B
, &sb_dqopt(sb
)->info
[type
].dqi_flags
);
323 EXPORT_SYMBOL(mark_info_dirty
);
326 * Read dquot from disk and alloc space for it
329 int dquot_acquire(struct dquot
*dquot
)
331 int ret
= 0, ret2
= 0;
332 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
334 mutex_lock(&dquot
->dq_lock
);
335 mutex_lock(&dqopt
->dqio_mutex
);
336 if (!test_bit(DQ_READ_B
, &dquot
->dq_flags
))
337 ret
= dqopt
->ops
[dquot
->dq_type
]->read_dqblk(dquot
);
340 set_bit(DQ_READ_B
, &dquot
->dq_flags
);
341 /* Instantiate dquot if needed */
342 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && !dquot
->dq_off
) {
343 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
344 /* Write the info if needed */
345 if (info_dirty(&dqopt
->info
[dquot
->dq_type
]))
346 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(dquot
->dq_sb
, dquot
->dq_type
);
354 set_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
356 mutex_unlock(&dqopt
->dqio_mutex
);
357 mutex_unlock(&dquot
->dq_lock
);
362 * Write dquot to disk
364 int dquot_commit(struct dquot
*dquot
)
366 int ret
= 0, ret2
= 0;
367 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
369 mutex_lock(&dqopt
->dqio_mutex
);
370 spin_lock(&dq_list_lock
);
371 if (!clear_dquot_dirty(dquot
)) {
372 spin_unlock(&dq_list_lock
);
375 spin_unlock(&dq_list_lock
);
376 /* Inactive dquot can be only if there was error during read/init
377 * => we have better not writing it */
378 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
379 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
380 if (info_dirty(&dqopt
->info
[dquot
->dq_type
]))
381 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(dquot
->dq_sb
, dquot
->dq_type
);
386 mutex_unlock(&dqopt
->dqio_mutex
);
393 int dquot_release(struct dquot
*dquot
)
395 int ret
= 0, ret2
= 0;
396 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
398 mutex_lock(&dquot
->dq_lock
);
399 /* Check whether we are not racing with some other dqget() */
400 if (atomic_read(&dquot
->dq_count
) > 1)
402 mutex_lock(&dqopt
->dqio_mutex
);
403 if (dqopt
->ops
[dquot
->dq_type
]->release_dqblk
) {
404 ret
= dqopt
->ops
[dquot
->dq_type
]->release_dqblk(dquot
);
406 if (info_dirty(&dqopt
->info
[dquot
->dq_type
]))
407 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(dquot
->dq_sb
, dquot
->dq_type
);
411 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
412 mutex_unlock(&dqopt
->dqio_mutex
);
414 mutex_unlock(&dquot
->dq_lock
);
418 static void dquot_destroy(struct dquot
*dquot
)
420 kmem_cache_free(dquot_cachep
, dquot
);
423 static inline void do_destroy_dquot(struct dquot
*dquot
)
425 dquot
->dq_sb
->dq_op
->destroy_dquot(dquot
);
428 /* Invalidate all dquots on the list. Note that this function is called after
429 * quota is disabled and pointers from inodes removed so there cannot be new
430 * quota users. There can still be some users of quotas due to inodes being
431 * just deleted or pruned by prune_icache() (those are not attached to any
432 * list). We have to wait for such users.
434 static void invalidate_dquots(struct super_block
*sb
, int type
)
436 struct dquot
*dquot
, *tmp
;
439 spin_lock(&dq_list_lock
);
440 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
441 if (dquot
->dq_sb
!= sb
)
443 if (dquot
->dq_type
!= type
)
445 /* Wait for dquot users */
446 if (atomic_read(&dquot
->dq_count
)) {
449 atomic_inc(&dquot
->dq_count
);
450 prepare_to_wait(&dquot
->dq_wait_unused
, &wait
,
451 TASK_UNINTERRUPTIBLE
);
452 spin_unlock(&dq_list_lock
);
453 /* Once dqput() wakes us up, we know it's time to free
455 * IMPORTANT: we rely on the fact that there is always
456 * at most one process waiting for dquot to free.
457 * Otherwise dq_count would be > 1 and we would never
460 if (atomic_read(&dquot
->dq_count
) > 1)
462 finish_wait(&dquot
->dq_wait_unused
, &wait
);
464 /* At this moment dquot() need not exist (it could be
465 * reclaimed by prune_dqcache(). Hence we must
470 * Quota now has no users and it has been written on last
473 remove_dquot_hash(dquot
);
474 remove_free_dquot(dquot
);
476 do_destroy_dquot(dquot
);
478 spin_unlock(&dq_list_lock
);
481 int vfs_quota_sync(struct super_block
*sb
, int type
)
483 struct list_head
*dirty
;
485 struct quota_info
*dqopt
= sb_dqopt(sb
);
488 mutex_lock(&dqopt
->dqonoff_mutex
);
489 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
490 if (type
!= -1 && cnt
!= type
)
492 if (!sb_has_quota_active(sb
, cnt
))
494 spin_lock(&dq_list_lock
);
495 dirty
= &dqopt
->info
[cnt
].dqi_dirty_list
;
496 while (!list_empty(dirty
)) {
497 dquot
= list_first_entry(dirty
, struct dquot
, dq_dirty
);
498 /* Dirty and inactive can be only bad dquot... */
499 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
500 clear_dquot_dirty(dquot
);
503 /* Now we have active dquot from which someone is
504 * holding reference so we can safely just increase
506 atomic_inc(&dquot
->dq_count
);
508 spin_unlock(&dq_list_lock
);
509 sb
->dq_op
->write_dquot(dquot
);
511 spin_lock(&dq_list_lock
);
513 spin_unlock(&dq_list_lock
);
516 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
517 if ((cnt
== type
|| type
== -1) && sb_has_quota_active(sb
, cnt
)
518 && info_dirty(&dqopt
->info
[cnt
]))
519 sb
->dq_op
->write_info(sb
, cnt
);
520 spin_lock(&dq_list_lock
);
522 spin_unlock(&dq_list_lock
);
523 mutex_unlock(&dqopt
->dqonoff_mutex
);
528 /* Free unused dquots from cache */
529 static void prune_dqcache(int count
)
531 struct list_head
*head
;
534 head
= free_dquots
.prev
;
535 while (head
!= &free_dquots
&& count
) {
536 dquot
= list_entry(head
, struct dquot
, dq_free
);
537 remove_dquot_hash(dquot
);
538 remove_free_dquot(dquot
);
540 do_destroy_dquot(dquot
);
542 head
= free_dquots
.prev
;
547 * This is called from kswapd when we think we need some
551 static int shrink_dqcache_memory(int nr
, gfp_t gfp_mask
)
554 spin_lock(&dq_list_lock
);
556 spin_unlock(&dq_list_lock
);
558 return (dqstats
.free_dquots
/ 100) * sysctl_vfs_cache_pressure
;
561 static struct shrinker dqcache_shrinker
= {
562 .shrink
= shrink_dqcache_memory
,
563 .seeks
= DEFAULT_SEEKS
,
567 * Put reference to dquot
568 * NOTE: If you change this function please check whether dqput_blocks() works right...
569 * MUST be called with either dqptr_sem or dqonoff_mutex held
571 static void dqput(struct dquot
*dquot
)
577 #ifdef __DQUOT_PARANOIA
578 if (!atomic_read(&dquot
->dq_count
)) {
579 printk("VFS: dqput: trying to free free dquot\n");
580 printk("VFS: device %s, dquot of %s %d\n",
582 quotatypes
[dquot
->dq_type
],
588 spin_lock(&dq_list_lock
);
590 spin_unlock(&dq_list_lock
);
592 spin_lock(&dq_list_lock
);
593 if (atomic_read(&dquot
->dq_count
) > 1) {
594 /* We have more than one user... nothing to do */
595 atomic_dec(&dquot
->dq_count
);
596 /* Releasing dquot during quotaoff phase? */
597 if (!sb_has_quota_active(dquot
->dq_sb
, dquot
->dq_type
) &&
598 atomic_read(&dquot
->dq_count
) == 1)
599 wake_up(&dquot
->dq_wait_unused
);
600 spin_unlock(&dq_list_lock
);
603 /* Need to release dquot? */
604 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && dquot_dirty(dquot
)) {
605 spin_unlock(&dq_list_lock
);
606 /* Commit dquot before releasing */
607 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
609 printk(KERN_ERR
"VFS: cannot write quota structure on "
610 "device %s (error %d). Quota may get out of "
611 "sync!\n", dquot
->dq_sb
->s_id
, ret
);
613 * We clear dirty bit anyway, so that we avoid
616 spin_lock(&dq_list_lock
);
617 clear_dquot_dirty(dquot
);
618 spin_unlock(&dq_list_lock
);
622 /* Clear flag in case dquot was inactive (something bad happened) */
623 clear_dquot_dirty(dquot
);
624 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
625 spin_unlock(&dq_list_lock
);
626 dquot
->dq_sb
->dq_op
->release_dquot(dquot
);
629 atomic_dec(&dquot
->dq_count
);
630 #ifdef __DQUOT_PARANOIA
632 BUG_ON(!list_empty(&dquot
->dq_free
));
634 put_dquot_last(dquot
);
635 spin_unlock(&dq_list_lock
);
638 static struct dquot
*dquot_alloc(struct super_block
*sb
, int type
)
640 return kmem_cache_zalloc(dquot_cachep
, GFP_NOFS
);
643 static struct dquot
*get_empty_dquot(struct super_block
*sb
, int type
)
647 dquot
= sb
->dq_op
->alloc_dquot(sb
, type
);
651 mutex_init(&dquot
->dq_lock
);
652 INIT_LIST_HEAD(&dquot
->dq_free
);
653 INIT_LIST_HEAD(&dquot
->dq_inuse
);
654 INIT_HLIST_NODE(&dquot
->dq_hash
);
655 INIT_LIST_HEAD(&dquot
->dq_dirty
);
656 init_waitqueue_head(&dquot
->dq_wait_unused
);
658 dquot
->dq_type
= type
;
659 atomic_set(&dquot
->dq_count
, 1);
665 * Get reference to dquot
666 * MUST be called with either dqptr_sem or dqonoff_mutex held
668 static struct dquot
*dqget(struct super_block
*sb
, unsigned int id
, int type
)
670 unsigned int hashent
= hashfn(sb
, id
, type
);
671 struct dquot
*dquot
, *empty
= NODQUOT
;
673 if (!sb_has_quota_active(sb
, type
))
676 spin_lock(&dq_list_lock
);
677 if ((dquot
= find_dquot(hashent
, sb
, id
, type
)) == NODQUOT
) {
678 if (empty
== NODQUOT
) {
679 spin_unlock(&dq_list_lock
);
680 if ((empty
= get_empty_dquot(sb
, type
)) == NODQUOT
)
681 schedule(); /* Try to wait for a moment... */
686 /* all dquots go on the inuse_list */
688 /* hash it first so it can be found */
689 insert_dquot_hash(dquot
);
691 spin_unlock(&dq_list_lock
);
693 if (!atomic_read(&dquot
->dq_count
))
694 remove_free_dquot(dquot
);
695 atomic_inc(&dquot
->dq_count
);
696 dqstats
.cache_hits
++;
698 spin_unlock(&dq_list_lock
);
700 do_destroy_dquot(empty
);
702 /* Wait for dq_lock - after this we know that either dquot_release() is already
703 * finished or it will be canceled due to dq_count > 1 test */
704 wait_on_dquot(dquot
);
705 /* Read the dquot and instantiate it (everything done only if needed) */
706 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && sb
->dq_op
->acquire_dquot(dquot
) < 0) {
710 #ifdef __DQUOT_PARANOIA
711 BUG_ON(!dquot
->dq_sb
); /* Has somebody invalidated entry under us? */
717 static int dqinit_needed(struct inode
*inode
, int type
)
721 if (IS_NOQUOTA(inode
))
724 return inode
->i_dquot
[type
] == NODQUOT
;
725 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
726 if (inode
->i_dquot
[cnt
] == NODQUOT
)
731 /* This routine is guarded by dqonoff_mutex mutex */
732 static void add_dquot_ref(struct super_block
*sb
, int type
)
734 struct inode
*inode
, *old_inode
= NULL
;
736 spin_lock(&inode_lock
);
737 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
738 if (!atomic_read(&inode
->i_writecount
))
740 if (!dqinit_needed(inode
, type
))
742 if (inode
->i_state
& (I_FREEING
|I_WILL_FREE
))
746 spin_unlock(&inode_lock
);
749 sb
->dq_op
->initialize(inode
, type
);
750 /* We hold a reference to 'inode' so it couldn't have been
751 * removed from s_inodes list while we dropped the inode_lock.
752 * We cannot iput the inode now as we can be holding the last
753 * reference and we cannot iput it under inode_lock. So we
754 * keep the reference and iput it later. */
756 spin_lock(&inode_lock
);
758 spin_unlock(&inode_lock
);
762 /* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */
763 static inline int dqput_blocks(struct dquot
*dquot
)
765 if (atomic_read(&dquot
->dq_count
) <= 1)
770 /* Remove references to dquots from inode - add dquot to list for freeing if needed */
771 /* We can't race with anybody because we hold dqptr_sem for writing... */
772 static int remove_inode_dquot_ref(struct inode
*inode
, int type
,
773 struct list_head
*tofree_head
)
775 struct dquot
*dquot
= inode
->i_dquot
[type
];
777 inode
->i_dquot
[type
] = NODQUOT
;
778 if (dquot
!= NODQUOT
) {
779 if (dqput_blocks(dquot
)) {
780 #ifdef __DQUOT_PARANOIA
781 if (atomic_read(&dquot
->dq_count
) != 1)
782 printk(KERN_WARNING
"VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot
->dq_count
));
784 spin_lock(&dq_list_lock
);
785 list_add(&dquot
->dq_free
, tofree_head
); /* As dquot must have currently users it can't be on the free list... */
786 spin_unlock(&dq_list_lock
);
790 dqput(dquot
); /* We have guaranteed we won't block */
795 /* Free list of dquots - called from inode.c */
796 /* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */
797 static void put_dquot_list(struct list_head
*tofree_head
)
799 struct list_head
*act_head
;
802 act_head
= tofree_head
->next
;
803 /* So now we have dquots on the list... Just free them */
804 while (act_head
!= tofree_head
) {
805 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
806 act_head
= act_head
->next
;
807 list_del_init(&dquot
->dq_free
); /* Remove dquot from the list so we won't have problems... */
812 static void remove_dquot_ref(struct super_block
*sb
, int type
,
813 struct list_head
*tofree_head
)
817 spin_lock(&inode_lock
);
818 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
819 if (!IS_NOQUOTA(inode
))
820 remove_inode_dquot_ref(inode
, type
, tofree_head
);
822 spin_unlock(&inode_lock
);
825 /* Gather all references from inodes and drop them */
826 static void drop_dquot_ref(struct super_block
*sb
, int type
)
828 LIST_HEAD(tofree_head
);
831 down_write(&sb_dqopt(sb
)->dqptr_sem
);
832 remove_dquot_ref(sb
, type
, &tofree_head
);
833 up_write(&sb_dqopt(sb
)->dqptr_sem
);
834 put_dquot_list(&tofree_head
);
838 static inline void dquot_incr_inodes(struct dquot
*dquot
, qsize_t number
)
840 dquot
->dq_dqb
.dqb_curinodes
+= number
;
843 static inline void dquot_incr_space(struct dquot
*dquot
, qsize_t number
)
845 dquot
->dq_dqb
.dqb_curspace
+= number
;
848 static inline void dquot_decr_inodes(struct dquot
*dquot
, qsize_t number
)
850 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
851 dquot
->dq_dqb
.dqb_curinodes
>= number
)
852 dquot
->dq_dqb
.dqb_curinodes
-= number
;
854 dquot
->dq_dqb
.dqb_curinodes
= 0;
855 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
856 dquot
->dq_dqb
.dqb_itime
= (time_t) 0;
857 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
860 static inline void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
862 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
863 dquot
->dq_dqb
.dqb_curspace
>= number
)
864 dquot
->dq_dqb
.dqb_curspace
-= number
;
866 dquot
->dq_dqb
.dqb_curspace
= 0;
867 if (dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
868 dquot
->dq_dqb
.dqb_btime
= (time_t) 0;
869 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
872 static int warning_issued(struct dquot
*dquot
, const int warntype
)
874 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
875 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
876 ((warntype
== QUOTA_NL_IHARDWARN
||
877 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
881 return test_and_set_bit(flag
, &dquot
->dq_flags
);
884 #ifdef CONFIG_PRINT_QUOTA_WARNING
885 static int flag_print_warnings
= 1;
887 static inline int need_print_warning(struct dquot
*dquot
)
889 if (!flag_print_warnings
)
892 switch (dquot
->dq_type
) {
894 return current_fsuid() == dquot
->dq_id
;
896 return in_group_p(dquot
->dq_id
);
901 /* Print warning to user which exceeded quota */
902 static void print_warning(struct dquot
*dquot
, const int warntype
)
905 struct tty_struct
*tty
;
907 if (warntype
== QUOTA_NL_IHARDBELOW
||
908 warntype
== QUOTA_NL_ISOFTBELOW
||
909 warntype
== QUOTA_NL_BHARDBELOW
||
910 warntype
== QUOTA_NL_BSOFTBELOW
|| !need_print_warning(dquot
))
913 tty
= get_current_tty();
916 tty_write_message(tty
, dquot
->dq_sb
->s_id
);
917 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
918 tty_write_message(tty
, ": warning, ");
920 tty_write_message(tty
, ": write failed, ");
921 tty_write_message(tty
, quotatypes
[dquot
->dq_type
]);
923 case QUOTA_NL_IHARDWARN
:
924 msg
= " file limit reached.\r\n";
926 case QUOTA_NL_ISOFTLONGWARN
:
927 msg
= " file quota exceeded too long.\r\n";
929 case QUOTA_NL_ISOFTWARN
:
930 msg
= " file quota exceeded.\r\n";
932 case QUOTA_NL_BHARDWARN
:
933 msg
= " block limit reached.\r\n";
935 case QUOTA_NL_BSOFTLONGWARN
:
936 msg
= " block quota exceeded too long.\r\n";
938 case QUOTA_NL_BSOFTWARN
:
939 msg
= " block quota exceeded.\r\n";
942 tty_write_message(tty
, msg
);
947 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
949 /* Netlink family structure for quota */
950 static struct genl_family quota_genl_family
= {
951 .id
= GENL_ID_GENERATE
,
955 .maxattr
= QUOTA_NL_A_MAX
,
958 /* Send warning to userspace about user which exceeded quota */
959 static void send_warning(const struct dquot
*dquot
, const char warntype
)
965 int msg_size
= 4 * nla_total_size(sizeof(u32
)) +
966 2 * nla_total_size(sizeof(u64
));
968 /* We have to allocate using GFP_NOFS as we are called from a
969 * filesystem performing write and thus further recursion into
970 * the fs to free some data could cause deadlocks. */
971 skb
= genlmsg_new(msg_size
, GFP_NOFS
);
974 "VFS: Not enough memory to send quota warning.\n");
977 msg_head
= genlmsg_put(skb
, 0, atomic_add_return(1, &seq
),
978 "a_genl_family
, 0, QUOTA_NL_C_WARNING
);
981 "VFS: Cannot store netlink header in quota warning.\n");
984 ret
= nla_put_u32(skb
, QUOTA_NL_A_QTYPE
, dquot
->dq_type
);
987 ret
= nla_put_u64(skb
, QUOTA_NL_A_EXCESS_ID
, dquot
->dq_id
);
990 ret
= nla_put_u32(skb
, QUOTA_NL_A_WARNING
, warntype
);
993 ret
= nla_put_u32(skb
, QUOTA_NL_A_DEV_MAJOR
,
994 MAJOR(dquot
->dq_sb
->s_dev
));
997 ret
= nla_put_u32(skb
, QUOTA_NL_A_DEV_MINOR
,
998 MINOR(dquot
->dq_sb
->s_dev
));
1001 ret
= nla_put_u64(skb
, QUOTA_NL_A_CAUSED_ID
, current_uid());
1004 genlmsg_end(skb
, msg_head
);
1006 ret
= genlmsg_multicast(skb
, 0, quota_genl_family
.id
, GFP_NOFS
);
1007 if (ret
< 0 && ret
!= -ESRCH
)
1009 "VFS: Failed to send notification message: %d\n", ret
);
1012 printk(KERN_ERR
"VFS: Not enough space to compose quota message!\n");
1018 static inline void flush_warnings(struct dquot
* const *dquots
, char *warntype
)
1022 for (i
= 0; i
< MAXQUOTAS
; i
++)
1023 if (dquots
[i
] != NODQUOT
&& warntype
[i
] != QUOTA_NL_NOWARN
&&
1024 !warning_issued(dquots
[i
], warntype
[i
])) {
1025 #ifdef CONFIG_PRINT_QUOTA_WARNING
1026 print_warning(dquots
[i
], warntype
[i
]);
1028 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
1029 send_warning(dquots
[i
], warntype
[i
]);
1034 static inline char ignore_hardlimit(struct dquot
*dquot
)
1036 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
1038 return capable(CAP_SYS_RESOURCE
) &&
1039 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
|| !(info
->dqi_flags
& V1_DQF_RSQUASH
));
1042 /* needs dq_data_lock */
1043 static int check_idq(struct dquot
*dquot
, qsize_t inodes
, char *warntype
)
1045 *warntype
= QUOTA_NL_NOWARN
;
1046 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
) ||
1047 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1050 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1051 (dquot
->dq_dqb
.dqb_curinodes
+ inodes
) > dquot
->dq_dqb
.dqb_ihardlimit
&&
1052 !ignore_hardlimit(dquot
)) {
1053 *warntype
= QUOTA_NL_IHARDWARN
;
1057 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1058 (dquot
->dq_dqb
.dqb_curinodes
+ inodes
) > dquot
->dq_dqb
.dqb_isoftlimit
&&
1059 dquot
->dq_dqb
.dqb_itime
&& get_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1060 !ignore_hardlimit(dquot
)) {
1061 *warntype
= QUOTA_NL_ISOFTLONGWARN
;
1065 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1066 (dquot
->dq_dqb
.dqb_curinodes
+ inodes
) > dquot
->dq_dqb
.dqb_isoftlimit
&&
1067 dquot
->dq_dqb
.dqb_itime
== 0) {
1068 *warntype
= QUOTA_NL_ISOFTWARN
;
1069 dquot
->dq_dqb
.dqb_itime
= get_seconds() + sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_igrace
;
1075 /* needs dq_data_lock */
1076 static int check_bdq(struct dquot
*dquot
, qsize_t space
, int prealloc
, char *warntype
)
1078 *warntype
= QUOTA_NL_NOWARN
;
1079 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
) ||
1080 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1083 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1084 dquot
->dq_dqb
.dqb_curspace
+ space
> dquot
->dq_dqb
.dqb_bhardlimit
&&
1085 !ignore_hardlimit(dquot
)) {
1087 *warntype
= QUOTA_NL_BHARDWARN
;
1091 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1092 dquot
->dq_dqb
.dqb_curspace
+ space
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1093 dquot
->dq_dqb
.dqb_btime
&& get_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1094 !ignore_hardlimit(dquot
)) {
1096 *warntype
= QUOTA_NL_BSOFTLONGWARN
;
1100 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1101 dquot
->dq_dqb
.dqb_curspace
+ space
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1102 dquot
->dq_dqb
.dqb_btime
== 0) {
1104 *warntype
= QUOTA_NL_BSOFTWARN
;
1105 dquot
->dq_dqb
.dqb_btime
= get_seconds() + sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_bgrace
;
1109 * We don't allow preallocation to exceed softlimit so exceeding will
1118 static int info_idq_free(struct dquot
*dquot
, qsize_t inodes
)
1120 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1121 dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
||
1122 !sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
))
1123 return QUOTA_NL_NOWARN
;
1125 if (dquot
->dq_dqb
.dqb_curinodes
- inodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1126 return QUOTA_NL_ISOFTBELOW
;
1127 if (dquot
->dq_dqb
.dqb_curinodes
>= dquot
->dq_dqb
.dqb_ihardlimit
&&
1128 dquot
->dq_dqb
.dqb_curinodes
- inodes
< dquot
->dq_dqb
.dqb_ihardlimit
)
1129 return QUOTA_NL_IHARDBELOW
;
1130 return QUOTA_NL_NOWARN
;
1133 static int info_bdq_free(struct dquot
*dquot
, qsize_t space
)
1135 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1136 dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1137 return QUOTA_NL_NOWARN
;
1139 if (dquot
->dq_dqb
.dqb_curspace
- space
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1140 return QUOTA_NL_BSOFTBELOW
;
1141 if (dquot
->dq_dqb
.dqb_curspace
>= dquot
->dq_dqb
.dqb_bhardlimit
&&
1142 dquot
->dq_dqb
.dqb_curspace
- space
< dquot
->dq_dqb
.dqb_bhardlimit
)
1143 return QUOTA_NL_BHARDBELOW
;
1144 return QUOTA_NL_NOWARN
;
1147 * Initialize quota pointers in inode
1148 * Transaction must be started at entry
1150 int dquot_initialize(struct inode
*inode
, int type
)
1152 unsigned int id
= 0;
1155 /* First test before acquiring mutex - solves deadlocks when we
1156 * re-enter the quota code and are already holding the mutex */
1157 if (IS_NOQUOTA(inode
))
1159 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1160 /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
1161 if (IS_NOQUOTA(inode
))
1163 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1164 if (type
!= -1 && cnt
!= type
)
1166 if (inode
->i_dquot
[cnt
] == NODQUOT
) {
1175 inode
->i_dquot
[cnt
] = dqget(inode
->i_sb
, id
, cnt
);
1179 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1184 * Release all quotas referenced by inode
1185 * Transaction must be started at an entry
1187 int dquot_drop(struct inode
*inode
)
1191 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1192 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1193 if (inode
->i_dquot
[cnt
] != NODQUOT
) {
1194 dqput(inode
->i_dquot
[cnt
]);
1195 inode
->i_dquot
[cnt
] = NODQUOT
;
1198 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1202 /* Wrapper to remove references to quota structures from inode */
1203 void vfs_dq_drop(struct inode
*inode
)
1205 /* Here we can get arbitrary inode from clear_inode() so we have
1206 * to be careful. OTOH we don't need locking as quota operations
1207 * are allowed to change only at mount time */
1208 if (!IS_NOQUOTA(inode
) && inode
->i_sb
&& inode
->i_sb
->dq_op
1209 && inode
->i_sb
->dq_op
->drop
) {
1211 /* Test before calling to rule out calls from proc and such
1212 * where we are not allowed to block. Note that this is
1213 * actually reliable test even without the lock - the caller
1214 * must assure that nobody can come after the DQUOT_DROP and
1215 * add quota pointers back anyway */
1216 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1217 if (inode
->i_dquot
[cnt
] != NODQUOT
)
1219 if (cnt
< MAXQUOTAS
)
1220 inode
->i_sb
->dq_op
->drop(inode
);
1225 * Following four functions update i_blocks+i_bytes fields and
1226 * quota information (together with appropriate checks)
1227 * NOTE: We absolutely rely on the fact that caller dirties
1228 * the inode (usually macros in quotaops.h care about this) and
1229 * holds a handle for the current transaction so that dquot write and
1230 * inode write go into the same transaction.
1234 * This operation can block, but only after everything is updated
1236 int dquot_alloc_space(struct inode
*inode
, qsize_t number
, int warn
)
1238 int cnt
, ret
= NO_QUOTA
;
1239 char warntype
[MAXQUOTAS
];
1241 /* First test before acquiring mutex - solves deadlocks when we
1242 * re-enter the quota code and are already holding the mutex */
1243 if (IS_NOQUOTA(inode
)) {
1245 inode_add_bytes(inode
, number
);
1248 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1249 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1251 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1252 if (IS_NOQUOTA(inode
)) { /* Now we can do reliable test... */
1253 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1256 spin_lock(&dq_data_lock
);
1257 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1258 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1260 if (check_bdq(inode
->i_dquot
[cnt
], number
, warn
, warntype
+cnt
) == NO_QUOTA
)
1263 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1264 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1266 dquot_incr_space(inode
->i_dquot
[cnt
], number
);
1268 inode_add_bytes(inode
, number
);
1271 spin_unlock(&dq_data_lock
);
1272 if (ret
== QUOTA_OK
)
1273 /* Dirtify all the dquots - this can block when journalling */
1274 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1275 if (inode
->i_dquot
[cnt
])
1276 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1277 flush_warnings(inode
->i_dquot
, warntype
);
1278 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1283 * This operation can block, but only after everything is updated
1285 int dquot_alloc_inode(const struct inode
*inode
, qsize_t number
)
1287 int cnt
, ret
= NO_QUOTA
;
1288 char warntype
[MAXQUOTAS
];
1290 /* First test before acquiring mutex - solves deadlocks when we
1291 * re-enter the quota code and are already holding the mutex */
1292 if (IS_NOQUOTA(inode
))
1294 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1295 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1296 down_read(&sb_dqopt(inode
->i_sb
)->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 if (check_idq(inode
->i_dquot
[cnt
], number
, warntype
+cnt
) == NO_QUOTA
)
1309 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1310 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1312 dquot_incr_inodes(inode
->i_dquot
[cnt
], number
);
1316 spin_unlock(&dq_data_lock
);
1317 if (ret
== QUOTA_OK
)
1318 /* Dirtify all the dquots - this can block when journalling */
1319 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1320 if (inode
->i_dquot
[cnt
])
1321 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1322 flush_warnings(inode
->i_dquot
, warntype
);
1323 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1328 * This operation can block, but only after everything is updated
1330 int dquot_free_space(struct inode
*inode
, qsize_t number
)
1333 char warntype
[MAXQUOTAS
];
1335 /* First test before acquiring mutex - solves deadlocks when we
1336 * re-enter the quota code and are already holding the mutex */
1337 if (IS_NOQUOTA(inode
)) {
1339 inode_sub_bytes(inode
, number
);
1343 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1344 /* Now recheck reliably when holding dqptr_sem */
1345 if (IS_NOQUOTA(inode
)) {
1346 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1349 spin_lock(&dq_data_lock
);
1350 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1351 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1353 warntype
[cnt
] = info_bdq_free(inode
->i_dquot
[cnt
], number
);
1354 dquot_decr_space(inode
->i_dquot
[cnt
], number
);
1356 inode_sub_bytes(inode
, number
);
1357 spin_unlock(&dq_data_lock
);
1358 /* Dirtify all the dquots - this can block when journalling */
1359 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1360 if (inode
->i_dquot
[cnt
])
1361 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1362 flush_warnings(inode
->i_dquot
, warntype
);
1363 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1368 * This operation can block, but only after everything is updated
1370 int dquot_free_inode(const struct inode
*inode
, qsize_t number
)
1373 char warntype
[MAXQUOTAS
];
1375 /* First test before acquiring mutex - solves deadlocks when we
1376 * re-enter the quota code and are already holding the mutex */
1377 if (IS_NOQUOTA(inode
))
1380 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1381 /* Now recheck reliably when holding dqptr_sem */
1382 if (IS_NOQUOTA(inode
)) {
1383 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1386 spin_lock(&dq_data_lock
);
1387 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1388 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1390 warntype
[cnt
] = info_idq_free(inode
->i_dquot
[cnt
], number
);
1391 dquot_decr_inodes(inode
->i_dquot
[cnt
], number
);
1393 spin_unlock(&dq_data_lock
);
1394 /* Dirtify all the dquots - this can block when journalling */
1395 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1396 if (inode
->i_dquot
[cnt
])
1397 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1398 flush_warnings(inode
->i_dquot
, warntype
);
1399 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1404 * Transfer the number of inode and blocks from one diskquota to an other.
1406 * This operation can block, but only after everything is updated
1407 * A transaction must be started when entering this function.
1409 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
1412 struct dquot
*transfer_from
[MAXQUOTAS
];
1413 struct dquot
*transfer_to
[MAXQUOTAS
];
1414 int cnt
, ret
= NO_QUOTA
, chuid
= (iattr
->ia_valid
& ATTR_UID
) && inode
->i_uid
!= iattr
->ia_uid
,
1415 chgid
= (iattr
->ia_valid
& ATTR_GID
) && inode
->i_gid
!= iattr
->ia_gid
;
1416 char warntype_to
[MAXQUOTAS
];
1417 char warntype_from_inodes
[MAXQUOTAS
], warntype_from_space
[MAXQUOTAS
];
1419 /* First test before acquiring mutex - solves deadlocks when we
1420 * re-enter the quota code and are already holding the mutex */
1421 if (IS_NOQUOTA(inode
))
1423 /* Clear the arrays */
1424 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1425 transfer_to
[cnt
] = transfer_from
[cnt
] = NODQUOT
;
1426 warntype_to
[cnt
] = QUOTA_NL_NOWARN
;
1428 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1429 /* Now recheck reliably when holding dqptr_sem */
1430 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1431 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1434 /* First build the transfer_to list - here we can block on
1435 * reading/instantiating of dquots. We know that the transaction for
1436 * us was already started so we don't violate lock ranking here */
1437 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1442 transfer_to
[cnt
] = dqget(inode
->i_sb
, iattr
->ia_uid
, cnt
);
1447 transfer_to
[cnt
] = dqget(inode
->i_sb
, iattr
->ia_gid
, cnt
);
1451 spin_lock(&dq_data_lock
);
1452 space
= inode_get_bytes(inode
);
1453 /* Build the transfer_from list and check the limits */
1454 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1455 if (transfer_to
[cnt
] == NODQUOT
)
1457 transfer_from
[cnt
] = inode
->i_dquot
[cnt
];
1458 if (check_idq(transfer_to
[cnt
], 1, warntype_to
+ cnt
) ==
1459 NO_QUOTA
|| check_bdq(transfer_to
[cnt
], space
, 0,
1460 warntype_to
+ cnt
) == NO_QUOTA
)
1465 * Finally perform the needed transfer from transfer_from to transfer_to
1467 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1469 * Skip changes for same uid or gid or for turned off quota-type.
1471 if (transfer_to
[cnt
] == NODQUOT
)
1474 /* Due to IO error we might not have transfer_from[] structure */
1475 if (transfer_from
[cnt
]) {
1476 warntype_from_inodes
[cnt
] =
1477 info_idq_free(transfer_from
[cnt
], 1);
1478 warntype_from_space
[cnt
] =
1479 info_bdq_free(transfer_from
[cnt
], space
);
1480 dquot_decr_inodes(transfer_from
[cnt
], 1);
1481 dquot_decr_space(transfer_from
[cnt
], space
);
1484 dquot_incr_inodes(transfer_to
[cnt
], 1);
1485 dquot_incr_space(transfer_to
[cnt
], space
);
1487 inode
->i_dquot
[cnt
] = transfer_to
[cnt
];
1491 spin_unlock(&dq_data_lock
);
1492 /* Dirtify all the dquots - this can block when journalling */
1493 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1494 if (transfer_from
[cnt
])
1495 mark_dquot_dirty(transfer_from
[cnt
]);
1496 if (transfer_to
[cnt
])
1497 mark_dquot_dirty(transfer_to
[cnt
]);
1499 flush_warnings(transfer_to
, warntype_to
);
1500 flush_warnings(transfer_from
, warntype_from_inodes
);
1501 flush_warnings(transfer_from
, warntype_from_space
);
1503 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1504 if (ret
== QUOTA_OK
&& transfer_from
[cnt
] != NODQUOT
)
1505 dqput(transfer_from
[cnt
]);
1506 if (ret
== NO_QUOTA
&& transfer_to
[cnt
] != NODQUOT
)
1507 dqput(transfer_to
[cnt
]);
1509 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1513 /* Wrapper for transferring ownership of an inode */
1514 int vfs_dq_transfer(struct inode
*inode
, struct iattr
*iattr
)
1516 if (sb_any_quota_active(inode
->i_sb
) && !IS_NOQUOTA(inode
)) {
1518 if (inode
->i_sb
->dq_op
->transfer(inode
, iattr
) == NO_QUOTA
)
1526 * Write info of quota file to disk
1528 int dquot_commit_info(struct super_block
*sb
, int type
)
1531 struct quota_info
*dqopt
= sb_dqopt(sb
);
1533 mutex_lock(&dqopt
->dqio_mutex
);
1534 ret
= dqopt
->ops
[type
]->write_file_info(sb
, type
);
1535 mutex_unlock(&dqopt
->dqio_mutex
);
1540 * Definitions of diskquota operations.
1542 struct dquot_operations dquot_operations
= {
1543 .initialize
= dquot_initialize
,
1545 .alloc_space
= dquot_alloc_space
,
1546 .alloc_inode
= dquot_alloc_inode
,
1547 .free_space
= dquot_free_space
,
1548 .free_inode
= dquot_free_inode
,
1549 .transfer
= dquot_transfer
,
1550 .write_dquot
= dquot_commit
,
1551 .acquire_dquot
= dquot_acquire
,
1552 .release_dquot
= dquot_release
,
1553 .mark_dirty
= dquot_mark_dquot_dirty
,
1554 .write_info
= dquot_commit_info
,
1555 .alloc_dquot
= dquot_alloc
,
1556 .destroy_dquot
= dquot_destroy
,
1560 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1562 int vfs_quota_disable(struct super_block
*sb
, int type
, unsigned int flags
)
1565 struct quota_info
*dqopt
= sb_dqopt(sb
);
1566 struct inode
*toputinode
[MAXQUOTAS
];
1568 /* Cannot turn off usage accounting without turning off limits, or
1569 * suspend quotas and simultaneously turn quotas off. */
1570 if ((flags
& DQUOT_USAGE_ENABLED
&& !(flags
& DQUOT_LIMITS_ENABLED
))
1571 || (flags
& DQUOT_SUSPENDED
&& flags
& (DQUOT_LIMITS_ENABLED
|
1572 DQUOT_USAGE_ENABLED
)))
1575 /* We need to serialize quota_off() for device */
1576 mutex_lock(&dqopt
->dqonoff_mutex
);
1579 * Skip everything if there's nothing to do. We have to do this because
1580 * sometimes we are called when fill_super() failed and calling
1581 * sync_fs() in such cases does no good.
1583 if (!sb_any_quota_loaded(sb
)) {
1584 mutex_unlock(&dqopt
->dqonoff_mutex
);
1587 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1588 toputinode
[cnt
] = NULL
;
1589 if (type
!= -1 && cnt
!= type
)
1591 if (!sb_has_quota_loaded(sb
, cnt
))
1594 if (flags
& DQUOT_SUSPENDED
) {
1596 dquot_state_flag(DQUOT_SUSPENDED
, cnt
);
1598 dqopt
->flags
&= ~dquot_state_flag(flags
, cnt
);
1599 /* Turning off suspended quotas? */
1600 if (!sb_has_quota_loaded(sb
, cnt
) &&
1601 sb_has_quota_suspended(sb
, cnt
)) {
1602 dqopt
->flags
&= ~dquot_state_flag(
1603 DQUOT_SUSPENDED
, cnt
);
1604 iput(dqopt
->files
[cnt
]);
1605 dqopt
->files
[cnt
] = NULL
;
1610 /* We still have to keep quota loaded? */
1611 if (sb_has_quota_loaded(sb
, cnt
) && !(flags
& DQUOT_SUSPENDED
))
1614 /* Note: these are blocking operations */
1615 drop_dquot_ref(sb
, cnt
);
1616 invalidate_dquots(sb
, cnt
);
1618 * Now all dquots should be invalidated, all writes done so we should be only
1619 * users of the info. No locks needed.
1621 if (info_dirty(&dqopt
->info
[cnt
]))
1622 sb
->dq_op
->write_info(sb
, cnt
);
1623 if (dqopt
->ops
[cnt
]->free_file_info
)
1624 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
1625 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
1627 toputinode
[cnt
] = dqopt
->files
[cnt
];
1628 if (!sb_has_quota_loaded(sb
, cnt
))
1629 dqopt
->files
[cnt
] = NULL
;
1630 dqopt
->info
[cnt
].dqi_flags
= 0;
1631 dqopt
->info
[cnt
].dqi_igrace
= 0;
1632 dqopt
->info
[cnt
].dqi_bgrace
= 0;
1633 dqopt
->ops
[cnt
] = NULL
;
1635 mutex_unlock(&dqopt
->dqonoff_mutex
);
1637 /* Skip syncing and setting flags if quota files are hidden */
1638 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
1641 /* Sync the superblock so that buffers with quota data are written to
1642 * disk (and so userspace sees correct data afterwards). */
1643 if (sb
->s_op
->sync_fs
)
1644 sb
->s_op
->sync_fs(sb
, 1);
1645 sync_blockdev(sb
->s_bdev
);
1646 /* Now the quota files are just ordinary files and we can set the
1647 * inode flags back. Moreover we discard the pagecache so that
1648 * userspace sees the writes we did bypassing the pagecache. We
1649 * must also discard the blockdev buffers so that we see the
1650 * changes done by userspace on the next quotaon() */
1651 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1652 if (toputinode
[cnt
]) {
1653 mutex_lock(&dqopt
->dqonoff_mutex
);
1654 /* If quota was reenabled in the meantime, we have
1656 if (!sb_has_quota_loaded(sb
, cnt
)) {
1657 mutex_lock_nested(&toputinode
[cnt
]->i_mutex
, I_MUTEX_QUOTA
);
1658 toputinode
[cnt
]->i_flags
&= ~(S_IMMUTABLE
|
1659 S_NOATIME
| S_NOQUOTA
);
1660 truncate_inode_pages(&toputinode
[cnt
]->i_data
, 0);
1661 mutex_unlock(&toputinode
[cnt
]->i_mutex
);
1662 mark_inode_dirty(toputinode
[cnt
]);
1664 mutex_unlock(&dqopt
->dqonoff_mutex
);
1667 invalidate_bdev(sb
->s_bdev
);
1669 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1670 if (toputinode
[cnt
]) {
1671 /* On remount RO, we keep the inode pointer so that we
1672 * can reenable quota on the subsequent remount RW. We
1673 * have to check 'flags' variable and not use sb_has_
1674 * function because another quotaon / quotaoff could
1675 * change global state before we got here. We refuse
1676 * to suspend quotas when there is pending delete on
1677 * the quota file... */
1678 if (!(flags
& DQUOT_SUSPENDED
))
1679 iput(toputinode
[cnt
]);
1680 else if (!toputinode
[cnt
]->i_nlink
)
1686 int vfs_quota_off(struct super_block
*sb
, int type
, int remount
)
1688 return vfs_quota_disable(sb
, type
, remount
? DQUOT_SUSPENDED
:
1689 (DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
));
1693 * Turn quotas on on a device
1697 * Helper function to turn quotas on when we already have the inode of
1698 * quota file and no quota information is loaded.
1700 static int vfs_load_quota_inode(struct inode
*inode
, int type
, int format_id
,
1703 struct quota_format_type
*fmt
= find_quota_format(format_id
);
1704 struct super_block
*sb
= inode
->i_sb
;
1705 struct quota_info
*dqopt
= sb_dqopt(sb
);
1711 if (!S_ISREG(inode
->i_mode
)) {
1715 if (IS_RDONLY(inode
)) {
1719 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
) {
1723 /* Usage always has to be set... */
1724 if (!(flags
& DQUOT_USAGE_ENABLED
)) {
1729 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
1730 /* As we bypass the pagecache we must now flush the inode so
1731 * that we see all the changes from userspace... */
1732 write_inode_now(inode
, 1);
1733 /* And now flush the block cache so that kernel sees the
1735 invalidate_bdev(sb
->s_bdev
);
1737 mutex_lock(&inode
->i_mutex
);
1738 mutex_lock(&dqopt
->dqonoff_mutex
);
1739 if (sb_has_quota_loaded(sb
, type
)) {
1744 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
1745 /* We don't want quota and atime on quota files (deadlocks
1746 * possible) Also nobody should write to the file - we use
1747 * special IO operations which ignore the immutable bit. */
1748 down_write(&dqopt
->dqptr_sem
);
1749 oldflags
= inode
->i_flags
& (S_NOATIME
| S_IMMUTABLE
| S_NOQUOTA
);
1750 inode
->i_flags
|= S_NOQUOTA
| S_NOATIME
| S_IMMUTABLE
;
1751 up_write(&dqopt
->dqptr_sem
);
1752 sb
->dq_op
->drop(inode
);
1756 dqopt
->files
[type
] = igrab(inode
);
1757 if (!dqopt
->files
[type
])
1760 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
1763 dqopt
->ops
[type
] = fmt
->qf_ops
;
1764 dqopt
->info
[type
].dqi_format
= fmt
;
1765 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
1766 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
1767 mutex_lock(&dqopt
->dqio_mutex
);
1768 if ((error
= dqopt
->ops
[type
]->read_file_info(sb
, type
)) < 0) {
1769 mutex_unlock(&dqopt
->dqio_mutex
);
1772 mutex_unlock(&dqopt
->dqio_mutex
);
1773 mutex_unlock(&inode
->i_mutex
);
1774 dqopt
->flags
|= dquot_state_flag(flags
, type
);
1776 add_dquot_ref(sb
, type
);
1777 mutex_unlock(&dqopt
->dqonoff_mutex
);
1782 dqopt
->files
[type
] = NULL
;
1785 mutex_unlock(&dqopt
->dqonoff_mutex
);
1786 if (oldflags
!= -1) {
1787 down_write(&dqopt
->dqptr_sem
);
1788 /* Set the flags back (in the case of accidental quotaon()
1789 * on a wrong file we don't want to mess up the flags) */
1790 inode
->i_flags
&= ~(S_NOATIME
| S_NOQUOTA
| S_IMMUTABLE
);
1791 inode
->i_flags
|= oldflags
;
1792 up_write(&dqopt
->dqptr_sem
);
1794 mutex_unlock(&inode
->i_mutex
);
1796 put_quota_format(fmt
);
1801 /* Reenable quotas on remount RW */
1802 static int vfs_quota_on_remount(struct super_block
*sb
, int type
)
1804 struct quota_info
*dqopt
= sb_dqopt(sb
);
1805 struct inode
*inode
;
1809 mutex_lock(&dqopt
->dqonoff_mutex
);
1810 if (!sb_has_quota_suspended(sb
, type
)) {
1811 mutex_unlock(&dqopt
->dqonoff_mutex
);
1814 inode
= dqopt
->files
[type
];
1815 dqopt
->files
[type
] = NULL
;
1816 flags
= dqopt
->flags
& dquot_state_flag(DQUOT_USAGE_ENABLED
|
1817 DQUOT_LIMITS_ENABLED
, type
);
1818 dqopt
->flags
&= ~dquot_state_flag(DQUOT_STATE_FLAGS
, type
);
1819 mutex_unlock(&dqopt
->dqonoff_mutex
);
1821 flags
= dquot_generic_flag(flags
, type
);
1822 ret
= vfs_load_quota_inode(inode
, type
, dqopt
->info
[type
].dqi_fmt_id
,
1829 int vfs_quota_on_path(struct super_block
*sb
, int type
, int format_id
,
1832 int error
= security_quota_on(path
->dentry
);
1835 /* Quota file not on the same filesystem? */
1836 if (path
->mnt
->mnt_sb
!= sb
)
1839 error
= vfs_load_quota_inode(path
->dentry
->d_inode
, type
,
1840 format_id
, DQUOT_USAGE_ENABLED
|
1841 DQUOT_LIMITS_ENABLED
);
1845 int vfs_quota_on(struct super_block
*sb
, int type
, int format_id
, char *name
,
1852 return vfs_quota_on_remount(sb
, type
);
1854 error
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
1856 error
= vfs_quota_on_path(sb
, type
, format_id
, &path
);
1863 * More powerful function for turning on quotas allowing setting
1864 * of individual quota flags
1866 int vfs_quota_enable(struct inode
*inode
, int type
, int format_id
,
1870 struct super_block
*sb
= inode
->i_sb
;
1871 struct quota_info
*dqopt
= sb_dqopt(sb
);
1873 /* Just unsuspend quotas? */
1874 if (flags
& DQUOT_SUSPENDED
)
1875 return vfs_quota_on_remount(sb
, type
);
1878 /* Just updating flags needed? */
1879 if (sb_has_quota_loaded(sb
, type
)) {
1880 mutex_lock(&dqopt
->dqonoff_mutex
);
1881 /* Now do a reliable test... */
1882 if (!sb_has_quota_loaded(sb
, type
)) {
1883 mutex_unlock(&dqopt
->dqonoff_mutex
);
1886 if (flags
& DQUOT_USAGE_ENABLED
&&
1887 sb_has_quota_usage_enabled(sb
, type
)) {
1891 if (flags
& DQUOT_LIMITS_ENABLED
&&
1892 sb_has_quota_limits_enabled(sb
, type
)) {
1896 sb_dqopt(sb
)->flags
|= dquot_state_flag(flags
, type
);
1898 mutex_unlock(&dqopt
->dqonoff_mutex
);
1903 return vfs_load_quota_inode(inode
, type
, format_id
, flags
);
1907 * This function is used when filesystem needs to initialize quotas
1908 * during mount time.
1910 int vfs_quota_on_mount(struct super_block
*sb
, char *qf_name
,
1911 int format_id
, int type
)
1913 struct dentry
*dentry
;
1916 dentry
= lookup_one_len(qf_name
, sb
->s_root
, strlen(qf_name
));
1918 return PTR_ERR(dentry
);
1920 if (!dentry
->d_inode
) {
1925 error
= security_quota_on(dentry
);
1927 error
= vfs_load_quota_inode(dentry
->d_inode
, type
, format_id
,
1928 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
1935 /* Wrapper to turn on quotas when remounting rw */
1936 int vfs_dq_quota_on_remount(struct super_block
*sb
)
1941 if (!sb
->s_qcop
|| !sb
->s_qcop
->quota_on
)
1943 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1944 err
= sb
->s_qcop
->quota_on(sb
, cnt
, 0, NULL
, 1);
1945 if (err
< 0 && !ret
)
1951 static inline qsize_t
qbtos(qsize_t blocks
)
1953 return blocks
<< QIF_DQBLKSIZE_BITS
;
1956 static inline qsize_t
stoqb(qsize_t space
)
1958 return (space
+ QIF_DQBLKSIZE
- 1) >> QIF_DQBLKSIZE_BITS
;
1961 /* Generic routine for getting common part of quota structure */
1962 static void do_get_dqblk(struct dquot
*dquot
, struct if_dqblk
*di
)
1964 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
1966 spin_lock(&dq_data_lock
);
1967 di
->dqb_bhardlimit
= stoqb(dm
->dqb_bhardlimit
);
1968 di
->dqb_bsoftlimit
= stoqb(dm
->dqb_bsoftlimit
);
1969 di
->dqb_curspace
= dm
->dqb_curspace
;
1970 di
->dqb_ihardlimit
= dm
->dqb_ihardlimit
;
1971 di
->dqb_isoftlimit
= dm
->dqb_isoftlimit
;
1972 di
->dqb_curinodes
= dm
->dqb_curinodes
;
1973 di
->dqb_btime
= dm
->dqb_btime
;
1974 di
->dqb_itime
= dm
->dqb_itime
;
1975 di
->dqb_valid
= QIF_ALL
;
1976 spin_unlock(&dq_data_lock
);
1979 int vfs_get_dqblk(struct super_block
*sb
, int type
, qid_t id
, struct if_dqblk
*di
)
1981 struct dquot
*dquot
;
1983 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
1984 if (!(dquot
= dqget(sb
, id
, type
))) {
1985 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
1988 do_get_dqblk(dquot
, di
);
1990 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
1994 /* Generic routine for setting common part of quota structure */
1995 static int do_set_dqblk(struct dquot
*dquot
, struct if_dqblk
*di
)
1997 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
1998 int check_blim
= 0, check_ilim
= 0;
1999 struct mem_dqinfo
*dqi
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
2001 if ((di
->dqb_valid
& QIF_BLIMITS
&&
2002 (di
->dqb_bhardlimit
> dqi
->dqi_maxblimit
||
2003 di
->dqb_bsoftlimit
> dqi
->dqi_maxblimit
)) ||
2004 (di
->dqb_valid
& QIF_ILIMITS
&&
2005 (di
->dqb_ihardlimit
> dqi
->dqi_maxilimit
||
2006 di
->dqb_isoftlimit
> dqi
->dqi_maxilimit
)))
2009 spin_lock(&dq_data_lock
);
2010 if (di
->dqb_valid
& QIF_SPACE
) {
2011 dm
->dqb_curspace
= di
->dqb_curspace
;
2013 __set_bit(DQ_LASTSET_B
+ QIF_SPACE_B
, &dquot
->dq_flags
);
2015 if (di
->dqb_valid
& QIF_BLIMITS
) {
2016 dm
->dqb_bsoftlimit
= qbtos(di
->dqb_bsoftlimit
);
2017 dm
->dqb_bhardlimit
= qbtos(di
->dqb_bhardlimit
);
2019 __set_bit(DQ_LASTSET_B
+ QIF_BLIMITS_B
, &dquot
->dq_flags
);
2021 if (di
->dqb_valid
& QIF_INODES
) {
2022 dm
->dqb_curinodes
= di
->dqb_curinodes
;
2024 __set_bit(DQ_LASTSET_B
+ QIF_INODES_B
, &dquot
->dq_flags
);
2026 if (di
->dqb_valid
& QIF_ILIMITS
) {
2027 dm
->dqb_isoftlimit
= di
->dqb_isoftlimit
;
2028 dm
->dqb_ihardlimit
= di
->dqb_ihardlimit
;
2030 __set_bit(DQ_LASTSET_B
+ QIF_ILIMITS_B
, &dquot
->dq_flags
);
2032 if (di
->dqb_valid
& QIF_BTIME
) {
2033 dm
->dqb_btime
= di
->dqb_btime
;
2034 __set_bit(DQ_LASTSET_B
+ QIF_BTIME_B
, &dquot
->dq_flags
);
2036 if (di
->dqb_valid
& QIF_ITIME
) {
2037 dm
->dqb_itime
= di
->dqb_itime
;
2038 __set_bit(DQ_LASTSET_B
+ QIF_ITIME_B
, &dquot
->dq_flags
);
2042 if (!dm
->dqb_bsoftlimit
|| dm
->dqb_curspace
< dm
->dqb_bsoftlimit
) {
2044 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
2046 else if (!(di
->dqb_valid
& QIF_BTIME
)) /* Set grace only if user hasn't provided his own... */
2047 dm
->dqb_btime
= get_seconds() + dqi
->dqi_bgrace
;
2050 if (!dm
->dqb_isoftlimit
|| dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
2052 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
2054 else if (!(di
->dqb_valid
& QIF_ITIME
)) /* Set grace only if user hasn't provided his own... */
2055 dm
->dqb_itime
= get_seconds() + dqi
->dqi_igrace
;
2057 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
|| dm
->dqb_isoftlimit
)
2058 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2060 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2061 spin_unlock(&dq_data_lock
);
2062 mark_dquot_dirty(dquot
);
2067 int vfs_set_dqblk(struct super_block
*sb
, int type
, qid_t id
, struct if_dqblk
*di
)
2069 struct dquot
*dquot
;
2072 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2073 dquot
= dqget(sb
, id
, type
);
2078 rc
= do_set_dqblk(dquot
, di
);
2081 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2085 /* Generic routine for getting common part of quota file information */
2086 int vfs_get_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2088 struct mem_dqinfo
*mi
;
2090 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2091 if (!sb_has_quota_active(sb
, type
)) {
2092 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2095 mi
= sb_dqopt(sb
)->info
+ type
;
2096 spin_lock(&dq_data_lock
);
2097 ii
->dqi_bgrace
= mi
->dqi_bgrace
;
2098 ii
->dqi_igrace
= mi
->dqi_igrace
;
2099 ii
->dqi_flags
= mi
->dqi_flags
& DQF_MASK
;
2100 ii
->dqi_valid
= IIF_ALL
;
2101 spin_unlock(&dq_data_lock
);
2102 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2106 /* Generic routine for setting common part of quota file information */
2107 int vfs_set_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2109 struct mem_dqinfo
*mi
;
2112 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2113 if (!sb_has_quota_active(sb
, type
)) {
2117 mi
= sb_dqopt(sb
)->info
+ type
;
2118 spin_lock(&dq_data_lock
);
2119 if (ii
->dqi_valid
& IIF_BGRACE
)
2120 mi
->dqi_bgrace
= ii
->dqi_bgrace
;
2121 if (ii
->dqi_valid
& IIF_IGRACE
)
2122 mi
->dqi_igrace
= ii
->dqi_igrace
;
2123 if (ii
->dqi_valid
& IIF_FLAGS
)
2124 mi
->dqi_flags
= (mi
->dqi_flags
& ~DQF_MASK
) | (ii
->dqi_flags
& DQF_MASK
);
2125 spin_unlock(&dq_data_lock
);
2126 mark_info_dirty(sb
, type
);
2127 /* Force write to disk */
2128 sb
->dq_op
->write_info(sb
, type
);
2130 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2134 struct quotactl_ops vfs_quotactl_ops
= {
2135 .quota_on
= vfs_quota_on
,
2136 .quota_off
= vfs_quota_off
,
2137 .quota_sync
= vfs_quota_sync
,
2138 .get_info
= vfs_get_dqinfo
,
2139 .set_info
= vfs_set_dqinfo
,
2140 .get_dqblk
= vfs_get_dqblk
,
2141 .set_dqblk
= vfs_set_dqblk
2144 static ctl_table fs_dqstats_table
[] = {
2146 .ctl_name
= FS_DQ_LOOKUPS
,
2147 .procname
= "lookups",
2148 .data
= &dqstats
.lookups
,
2149 .maxlen
= sizeof(int),
2151 .proc_handler
= &proc_dointvec
,
2154 .ctl_name
= FS_DQ_DROPS
,
2155 .procname
= "drops",
2156 .data
= &dqstats
.drops
,
2157 .maxlen
= sizeof(int),
2159 .proc_handler
= &proc_dointvec
,
2162 .ctl_name
= FS_DQ_READS
,
2163 .procname
= "reads",
2164 .data
= &dqstats
.reads
,
2165 .maxlen
= sizeof(int),
2167 .proc_handler
= &proc_dointvec
,
2170 .ctl_name
= FS_DQ_WRITES
,
2171 .procname
= "writes",
2172 .data
= &dqstats
.writes
,
2173 .maxlen
= sizeof(int),
2175 .proc_handler
= &proc_dointvec
,
2178 .ctl_name
= FS_DQ_CACHE_HITS
,
2179 .procname
= "cache_hits",
2180 .data
= &dqstats
.cache_hits
,
2181 .maxlen
= sizeof(int),
2183 .proc_handler
= &proc_dointvec
,
2186 .ctl_name
= FS_DQ_ALLOCATED
,
2187 .procname
= "allocated_dquots",
2188 .data
= &dqstats
.allocated_dquots
,
2189 .maxlen
= sizeof(int),
2191 .proc_handler
= &proc_dointvec
,
2194 .ctl_name
= FS_DQ_FREE
,
2195 .procname
= "free_dquots",
2196 .data
= &dqstats
.free_dquots
,
2197 .maxlen
= sizeof(int),
2199 .proc_handler
= &proc_dointvec
,
2202 .ctl_name
= FS_DQ_SYNCS
,
2203 .procname
= "syncs",
2204 .data
= &dqstats
.syncs
,
2205 .maxlen
= sizeof(int),
2207 .proc_handler
= &proc_dointvec
,
2209 #ifdef CONFIG_PRINT_QUOTA_WARNING
2211 .ctl_name
= FS_DQ_WARNINGS
,
2212 .procname
= "warnings",
2213 .data
= &flag_print_warnings
,
2214 .maxlen
= sizeof(int),
2216 .proc_handler
= &proc_dointvec
,
2222 static ctl_table fs_table
[] = {
2224 .ctl_name
= FS_DQSTATS
,
2225 .procname
= "quota",
2227 .child
= fs_dqstats_table
,
2232 static ctl_table sys_table
[] = {
2242 static int __init
dquot_init(void)
2245 unsigned long nr_hash
, order
;
2247 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2249 register_sysctl_table(sys_table
);
2251 dquot_cachep
= kmem_cache_create("dquot",
2252 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2253 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2254 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2258 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
2260 panic("Cannot create dquot hash table");
2262 /* Find power-of-two hlist_heads which can fit into allocation */
2263 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2267 } while (nr_hash
>> dq_hash_bits
);
2270 nr_hash
= 1UL << dq_hash_bits
;
2271 dq_hash_mask
= nr_hash
- 1;
2272 for (i
= 0; i
< nr_hash
; i
++)
2273 INIT_HLIST_HEAD(dquot_hash
+ i
);
2275 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2276 nr_hash
, order
, (PAGE_SIZE
<< order
));
2278 register_shrinker(&dqcache_shrinker
);
2280 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
2281 if (genl_register_family("a_genl_family
) != 0)
2282 printk(KERN_ERR
"VFS: Failed to create quota netlink interface.\n");
2287 module_init(dquot_init
);
2289 EXPORT_SYMBOL(register_quota_format
);
2290 EXPORT_SYMBOL(unregister_quota_format
);
2291 EXPORT_SYMBOL(dqstats
);
2292 EXPORT_SYMBOL(dq_data_lock
);
2293 EXPORT_SYMBOL(vfs_quota_enable
);
2294 EXPORT_SYMBOL(vfs_quota_on
);
2295 EXPORT_SYMBOL(vfs_quota_on_path
);
2296 EXPORT_SYMBOL(vfs_quota_on_mount
);
2297 EXPORT_SYMBOL(vfs_quota_disable
);
2298 EXPORT_SYMBOL(vfs_quota_off
);
2299 EXPORT_SYMBOL(vfs_quota_sync
);
2300 EXPORT_SYMBOL(vfs_get_dqinfo
);
2301 EXPORT_SYMBOL(vfs_set_dqinfo
);
2302 EXPORT_SYMBOL(vfs_get_dqblk
);
2303 EXPORT_SYMBOL(vfs_set_dqblk
);
2304 EXPORT_SYMBOL(dquot_commit
);
2305 EXPORT_SYMBOL(dquot_commit_info
);
2306 EXPORT_SYMBOL(dquot_acquire
);
2307 EXPORT_SYMBOL(dquot_release
);
2308 EXPORT_SYMBOL(dquot_mark_dquot_dirty
);
2309 EXPORT_SYMBOL(dquot_initialize
);
2310 EXPORT_SYMBOL(dquot_drop
);
2311 EXPORT_SYMBOL(vfs_dq_drop
);
2312 EXPORT_SYMBOL(dquot_alloc_space
);
2313 EXPORT_SYMBOL(dquot_alloc_inode
);
2314 EXPORT_SYMBOL(dquot_free_space
);
2315 EXPORT_SYMBOL(dquot_free_inode
);
2316 EXPORT_SYMBOL(dquot_transfer
);
2317 EXPORT_SYMBOL(vfs_dq_transfer
);
2318 EXPORT_SYMBOL(vfs_dq_quota_on_remount
);