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 inline unsigned int
215 hashfn(const struct super_block
*sb
, unsigned int id
, int type
)
219 tmp
= (((unsigned long)sb
>>L1_CACHE_SHIFT
) ^ id
) * (MAXQUOTAS
- type
);
220 return (tmp
+ (tmp
>> dq_hash_bits
)) & dq_hash_mask
;
224 * Following list functions expect dq_list_lock to be held
226 static inline void insert_dquot_hash(struct dquot
*dquot
)
228 struct hlist_head
*head
= dquot_hash
+ hashfn(dquot
->dq_sb
, dquot
->dq_id
, dquot
->dq_type
);
229 hlist_add_head(&dquot
->dq_hash
, head
);
232 static inline void remove_dquot_hash(struct dquot
*dquot
)
234 hlist_del_init(&dquot
->dq_hash
);
237 static inline struct dquot
*find_dquot(unsigned int hashent
, struct super_block
*sb
, unsigned int id
, int type
)
239 struct hlist_node
*node
;
242 hlist_for_each (node
, dquot_hash
+hashent
) {
243 dquot
= hlist_entry(node
, struct dquot
, dq_hash
);
244 if (dquot
->dq_sb
== sb
&& dquot
->dq_id
== id
&& dquot
->dq_type
== type
)
250 /* Add a dquot to the tail of the free list */
251 static inline void put_dquot_last(struct dquot
*dquot
)
253 list_add_tail(&dquot
->dq_free
, &free_dquots
);
254 dqstats
.free_dquots
++;
257 static inline void remove_free_dquot(struct dquot
*dquot
)
259 if (list_empty(&dquot
->dq_free
))
261 list_del_init(&dquot
->dq_free
);
262 dqstats
.free_dquots
--;
265 static inline void put_inuse(struct dquot
*dquot
)
267 /* We add to the back of inuse list so we don't have to restart
268 * when traversing this list and we block */
269 list_add_tail(&dquot
->dq_inuse
, &inuse_list
);
270 dqstats
.allocated_dquots
++;
273 static inline void remove_inuse(struct dquot
*dquot
)
275 dqstats
.allocated_dquots
--;
276 list_del(&dquot
->dq_inuse
);
279 * End of list functions needing dq_list_lock
282 static void wait_on_dquot(struct dquot
*dquot
)
284 mutex_lock(&dquot
->dq_lock
);
285 mutex_unlock(&dquot
->dq_lock
);
288 static inline int dquot_dirty(struct dquot
*dquot
)
290 return test_bit(DQ_MOD_B
, &dquot
->dq_flags
);
293 static inline int mark_dquot_dirty(struct dquot
*dquot
)
295 return dquot
->dq_sb
->dq_op
->mark_dirty(dquot
);
298 int dquot_mark_dquot_dirty(struct dquot
*dquot
)
300 spin_lock(&dq_list_lock
);
301 if (!test_and_set_bit(DQ_MOD_B
, &dquot
->dq_flags
))
302 list_add(&dquot
->dq_dirty
, &sb_dqopt(dquot
->dq_sb
)->
303 info
[dquot
->dq_type
].dqi_dirty_list
);
304 spin_unlock(&dq_list_lock
);
308 /* This function needs dq_list_lock */
309 static inline int clear_dquot_dirty(struct dquot
*dquot
)
311 if (!test_and_clear_bit(DQ_MOD_B
, &dquot
->dq_flags
))
313 list_del_init(&dquot
->dq_dirty
);
317 void mark_info_dirty(struct super_block
*sb
, int type
)
319 set_bit(DQF_INFO_DIRTY_B
, &sb_dqopt(sb
)->info
[type
].dqi_flags
);
321 EXPORT_SYMBOL(mark_info_dirty
);
324 * Read dquot from disk and alloc space for it
327 int dquot_acquire(struct dquot
*dquot
)
329 int ret
= 0, ret2
= 0;
330 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
332 mutex_lock(&dquot
->dq_lock
);
333 mutex_lock(&dqopt
->dqio_mutex
);
334 if (!test_bit(DQ_READ_B
, &dquot
->dq_flags
))
335 ret
= dqopt
->ops
[dquot
->dq_type
]->read_dqblk(dquot
);
338 set_bit(DQ_READ_B
, &dquot
->dq_flags
);
339 /* Instantiate dquot if needed */
340 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && !dquot
->dq_off
) {
341 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
342 /* Write the info if needed */
343 if (info_dirty(&dqopt
->info
[dquot
->dq_type
]))
344 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(dquot
->dq_sb
, dquot
->dq_type
);
352 set_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
354 mutex_unlock(&dqopt
->dqio_mutex
);
355 mutex_unlock(&dquot
->dq_lock
);
360 * Write dquot to disk
362 int dquot_commit(struct dquot
*dquot
)
364 int ret
= 0, ret2
= 0;
365 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
367 mutex_lock(&dqopt
->dqio_mutex
);
368 spin_lock(&dq_list_lock
);
369 if (!clear_dquot_dirty(dquot
)) {
370 spin_unlock(&dq_list_lock
);
373 spin_unlock(&dq_list_lock
);
374 /* Inactive dquot can be only if there was error during read/init
375 * => we have better not writing it */
376 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
377 ret
= dqopt
->ops
[dquot
->dq_type
]->commit_dqblk(dquot
);
378 if (info_dirty(&dqopt
->info
[dquot
->dq_type
]))
379 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(dquot
->dq_sb
, dquot
->dq_type
);
384 mutex_unlock(&dqopt
->dqio_mutex
);
391 int dquot_release(struct dquot
*dquot
)
393 int ret
= 0, ret2
= 0;
394 struct quota_info
*dqopt
= sb_dqopt(dquot
->dq_sb
);
396 mutex_lock(&dquot
->dq_lock
);
397 /* Check whether we are not racing with some other dqget() */
398 if (atomic_read(&dquot
->dq_count
) > 1)
400 mutex_lock(&dqopt
->dqio_mutex
);
401 if (dqopt
->ops
[dquot
->dq_type
]->release_dqblk
) {
402 ret
= dqopt
->ops
[dquot
->dq_type
]->release_dqblk(dquot
);
404 if (info_dirty(&dqopt
->info
[dquot
->dq_type
]))
405 ret2
= dqopt
->ops
[dquot
->dq_type
]->write_file_info(dquot
->dq_sb
, dquot
->dq_type
);
409 clear_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
);
410 mutex_unlock(&dqopt
->dqio_mutex
);
412 mutex_unlock(&dquot
->dq_lock
);
416 static void dquot_destroy(struct dquot
*dquot
)
418 kmem_cache_free(dquot_cachep
, dquot
);
421 static inline void do_destroy_dquot(struct dquot
*dquot
)
423 dquot
->dq_sb
->dq_op
->destroy_dquot(dquot
);
426 /* Invalidate all dquots on the list. Note that this function is called after
427 * quota is disabled and pointers from inodes removed so there cannot be new
428 * quota users. There can still be some users of quotas due to inodes being
429 * just deleted or pruned by prune_icache() (those are not attached to any
430 * list). We have to wait for such users.
432 static void invalidate_dquots(struct super_block
*sb
, int type
)
434 struct dquot
*dquot
, *tmp
;
437 spin_lock(&dq_list_lock
);
438 list_for_each_entry_safe(dquot
, tmp
, &inuse_list
, dq_inuse
) {
439 if (dquot
->dq_sb
!= sb
)
441 if (dquot
->dq_type
!= type
)
443 /* Wait for dquot users */
444 if (atomic_read(&dquot
->dq_count
)) {
447 atomic_inc(&dquot
->dq_count
);
448 prepare_to_wait(&dquot
->dq_wait_unused
, &wait
,
449 TASK_UNINTERRUPTIBLE
);
450 spin_unlock(&dq_list_lock
);
451 /* Once dqput() wakes us up, we know it's time to free
453 * IMPORTANT: we rely on the fact that there is always
454 * at most one process waiting for dquot to free.
455 * Otherwise dq_count would be > 1 and we would never
458 if (atomic_read(&dquot
->dq_count
) > 1)
460 finish_wait(&dquot
->dq_wait_unused
, &wait
);
462 /* At this moment dquot() need not exist (it could be
463 * reclaimed by prune_dqcache(). Hence we must
468 * Quota now has no users and it has been written on last
471 remove_dquot_hash(dquot
);
472 remove_free_dquot(dquot
);
474 do_destroy_dquot(dquot
);
476 spin_unlock(&dq_list_lock
);
479 /* Call callback for every active dquot on given filesystem */
480 int dquot_scan_active(struct super_block
*sb
,
481 int (*fn
)(struct dquot
*dquot
, unsigned long priv
),
484 struct dquot
*dquot
, *old_dquot
= NULL
;
487 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
488 spin_lock(&dq_list_lock
);
489 list_for_each_entry(dquot
, &inuse_list
, dq_inuse
) {
490 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
))
492 if (dquot
->dq_sb
!= sb
)
494 /* Now we have active dquot so we can just increase use count */
495 atomic_inc(&dquot
->dq_count
);
497 spin_unlock(&dq_list_lock
);
500 ret
= fn(dquot
, priv
);
503 spin_lock(&dq_list_lock
);
504 /* We are safe to continue now because our dquot could not
505 * be moved out of the inuse list while we hold the reference */
507 spin_unlock(&dq_list_lock
);
510 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
514 int vfs_quota_sync(struct super_block
*sb
, int type
)
516 struct list_head
*dirty
;
518 struct quota_info
*dqopt
= sb_dqopt(sb
);
521 mutex_lock(&dqopt
->dqonoff_mutex
);
522 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
523 if (type
!= -1 && cnt
!= type
)
525 if (!sb_has_quota_active(sb
, cnt
))
527 spin_lock(&dq_list_lock
);
528 dirty
= &dqopt
->info
[cnt
].dqi_dirty_list
;
529 while (!list_empty(dirty
)) {
530 dquot
= list_first_entry(dirty
, struct dquot
, dq_dirty
);
531 /* Dirty and inactive can be only bad dquot... */
532 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
533 clear_dquot_dirty(dquot
);
536 /* Now we have active dquot from which someone is
537 * holding reference so we can safely just increase
539 atomic_inc(&dquot
->dq_count
);
541 spin_unlock(&dq_list_lock
);
542 sb
->dq_op
->write_dquot(dquot
);
544 spin_lock(&dq_list_lock
);
546 spin_unlock(&dq_list_lock
);
549 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
550 if ((cnt
== type
|| type
== -1) && sb_has_quota_active(sb
, cnt
)
551 && info_dirty(&dqopt
->info
[cnt
]))
552 sb
->dq_op
->write_info(sb
, cnt
);
553 spin_lock(&dq_list_lock
);
555 spin_unlock(&dq_list_lock
);
556 mutex_unlock(&dqopt
->dqonoff_mutex
);
561 /* Free unused dquots from cache */
562 static void prune_dqcache(int count
)
564 struct list_head
*head
;
567 head
= free_dquots
.prev
;
568 while (head
!= &free_dquots
&& count
) {
569 dquot
= list_entry(head
, struct dquot
, dq_free
);
570 remove_dquot_hash(dquot
);
571 remove_free_dquot(dquot
);
573 do_destroy_dquot(dquot
);
575 head
= free_dquots
.prev
;
580 * This is called from kswapd when we think we need some
584 static int shrink_dqcache_memory(int nr
, gfp_t gfp_mask
)
587 spin_lock(&dq_list_lock
);
589 spin_unlock(&dq_list_lock
);
591 return (dqstats
.free_dquots
/ 100) * sysctl_vfs_cache_pressure
;
594 static struct shrinker dqcache_shrinker
= {
595 .shrink
= shrink_dqcache_memory
,
596 .seeks
= DEFAULT_SEEKS
,
600 * Put reference to dquot
601 * NOTE: If you change this function please check whether dqput_blocks() works right...
602 * MUST be called with either dqptr_sem or dqonoff_mutex held
604 void dqput(struct dquot
*dquot
)
610 #ifdef __DQUOT_PARANOIA
611 if (!atomic_read(&dquot
->dq_count
)) {
612 printk("VFS: dqput: trying to free free dquot\n");
613 printk("VFS: device %s, dquot of %s %d\n",
615 quotatypes
[dquot
->dq_type
],
621 spin_lock(&dq_list_lock
);
623 spin_unlock(&dq_list_lock
);
625 spin_lock(&dq_list_lock
);
626 if (atomic_read(&dquot
->dq_count
) > 1) {
627 /* We have more than one user... nothing to do */
628 atomic_dec(&dquot
->dq_count
);
629 /* Releasing dquot during quotaoff phase? */
630 if (!sb_has_quota_active(dquot
->dq_sb
, dquot
->dq_type
) &&
631 atomic_read(&dquot
->dq_count
) == 1)
632 wake_up(&dquot
->dq_wait_unused
);
633 spin_unlock(&dq_list_lock
);
636 /* Need to release dquot? */
637 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && dquot_dirty(dquot
)) {
638 spin_unlock(&dq_list_lock
);
639 /* Commit dquot before releasing */
640 ret
= dquot
->dq_sb
->dq_op
->write_dquot(dquot
);
642 printk(KERN_ERR
"VFS: cannot write quota structure on "
643 "device %s (error %d). Quota may get out of "
644 "sync!\n", dquot
->dq_sb
->s_id
, ret
);
646 * We clear dirty bit anyway, so that we avoid
649 spin_lock(&dq_list_lock
);
650 clear_dquot_dirty(dquot
);
651 spin_unlock(&dq_list_lock
);
655 /* Clear flag in case dquot was inactive (something bad happened) */
656 clear_dquot_dirty(dquot
);
657 if (test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
)) {
658 spin_unlock(&dq_list_lock
);
659 dquot
->dq_sb
->dq_op
->release_dquot(dquot
);
662 atomic_dec(&dquot
->dq_count
);
663 #ifdef __DQUOT_PARANOIA
665 BUG_ON(!list_empty(&dquot
->dq_free
));
667 put_dquot_last(dquot
);
668 spin_unlock(&dq_list_lock
);
671 static struct dquot
*dquot_alloc(struct super_block
*sb
, int type
)
673 return kmem_cache_zalloc(dquot_cachep
, GFP_NOFS
);
676 static struct dquot
*get_empty_dquot(struct super_block
*sb
, int type
)
680 dquot
= sb
->dq_op
->alloc_dquot(sb
, type
);
684 mutex_init(&dquot
->dq_lock
);
685 INIT_LIST_HEAD(&dquot
->dq_free
);
686 INIT_LIST_HEAD(&dquot
->dq_inuse
);
687 INIT_HLIST_NODE(&dquot
->dq_hash
);
688 INIT_LIST_HEAD(&dquot
->dq_dirty
);
689 init_waitqueue_head(&dquot
->dq_wait_unused
);
691 dquot
->dq_type
= type
;
692 atomic_set(&dquot
->dq_count
, 1);
698 * Check whether dquot is in memory.
699 * MUST be called with either dqptr_sem or dqonoff_mutex held
701 int dquot_is_cached(struct super_block
*sb
, unsigned int id
, int type
)
703 unsigned int hashent
= hashfn(sb
, id
, type
);
706 if (!sb_has_quota_active(sb
, type
))
708 spin_lock(&dq_list_lock
);
709 if (find_dquot(hashent
, sb
, id
, type
) != NODQUOT
)
711 spin_unlock(&dq_list_lock
);
716 * Get reference to dquot
717 * MUST be called with either dqptr_sem or dqonoff_mutex held
719 struct dquot
*dqget(struct super_block
*sb
, unsigned int id
, int type
)
721 unsigned int hashent
= hashfn(sb
, id
, type
);
722 struct dquot
*dquot
, *empty
= NODQUOT
;
724 if (!sb_has_quota_active(sb
, type
))
727 spin_lock(&dq_list_lock
);
728 if ((dquot
= find_dquot(hashent
, sb
, id
, type
)) == NODQUOT
) {
729 if (empty
== NODQUOT
) {
730 spin_unlock(&dq_list_lock
);
731 if ((empty
= get_empty_dquot(sb
, type
)) == NODQUOT
)
732 schedule(); /* Try to wait for a moment... */
737 /* all dquots go on the inuse_list */
739 /* hash it first so it can be found */
740 insert_dquot_hash(dquot
);
742 spin_unlock(&dq_list_lock
);
744 if (!atomic_read(&dquot
->dq_count
))
745 remove_free_dquot(dquot
);
746 atomic_inc(&dquot
->dq_count
);
747 dqstats
.cache_hits
++;
749 spin_unlock(&dq_list_lock
);
751 do_destroy_dquot(empty
);
753 /* Wait for dq_lock - after this we know that either dquot_release() is already
754 * finished or it will be canceled due to dq_count > 1 test */
755 wait_on_dquot(dquot
);
756 /* Read the dquot and instantiate it (everything done only if needed) */
757 if (!test_bit(DQ_ACTIVE_B
, &dquot
->dq_flags
) && sb
->dq_op
->acquire_dquot(dquot
) < 0) {
761 #ifdef __DQUOT_PARANOIA
762 BUG_ON(!dquot
->dq_sb
); /* Has somebody invalidated entry under us? */
768 static int dqinit_needed(struct inode
*inode
, int type
)
772 if (IS_NOQUOTA(inode
))
775 return inode
->i_dquot
[type
] == NODQUOT
;
776 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
777 if (inode
->i_dquot
[cnt
] == NODQUOT
)
782 /* This routine is guarded by dqonoff_mutex mutex */
783 static void add_dquot_ref(struct super_block
*sb
, int type
)
785 struct inode
*inode
, *old_inode
= NULL
;
787 spin_lock(&inode_lock
);
788 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
789 if (!atomic_read(&inode
->i_writecount
))
791 if (!dqinit_needed(inode
, type
))
793 if (inode
->i_state
& (I_FREEING
|I_WILL_FREE
))
797 spin_unlock(&inode_lock
);
800 sb
->dq_op
->initialize(inode
, type
);
801 /* We hold a reference to 'inode' so it couldn't have been
802 * removed from s_inodes list while we dropped the inode_lock.
803 * We cannot iput the inode now as we can be holding the last
804 * reference and we cannot iput it under inode_lock. So we
805 * keep the reference and iput it later. */
807 spin_lock(&inode_lock
);
809 spin_unlock(&inode_lock
);
813 /* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */
814 static inline int dqput_blocks(struct dquot
*dquot
)
816 if (atomic_read(&dquot
->dq_count
) <= 1)
821 /* Remove references to dquots from inode - add dquot to list for freeing if needed */
822 /* We can't race with anybody because we hold dqptr_sem for writing... */
823 static int remove_inode_dquot_ref(struct inode
*inode
, int type
,
824 struct list_head
*tofree_head
)
826 struct dquot
*dquot
= inode
->i_dquot
[type
];
828 inode
->i_dquot
[type
] = NODQUOT
;
829 if (dquot
!= NODQUOT
) {
830 if (dqput_blocks(dquot
)) {
831 #ifdef __DQUOT_PARANOIA
832 if (atomic_read(&dquot
->dq_count
) != 1)
833 printk(KERN_WARNING
"VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot
->dq_count
));
835 spin_lock(&dq_list_lock
);
836 list_add(&dquot
->dq_free
, tofree_head
); /* As dquot must have currently users it can't be on the free list... */
837 spin_unlock(&dq_list_lock
);
841 dqput(dquot
); /* We have guaranteed we won't block */
846 /* Free list of dquots - called from inode.c */
847 /* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */
848 static void put_dquot_list(struct list_head
*tofree_head
)
850 struct list_head
*act_head
;
853 act_head
= tofree_head
->next
;
854 /* So now we have dquots on the list... Just free them */
855 while (act_head
!= tofree_head
) {
856 dquot
= list_entry(act_head
, struct dquot
, dq_free
);
857 act_head
= act_head
->next
;
858 list_del_init(&dquot
->dq_free
); /* Remove dquot from the list so we won't have problems... */
863 static void remove_dquot_ref(struct super_block
*sb
, int type
,
864 struct list_head
*tofree_head
)
868 spin_lock(&inode_lock
);
869 list_for_each_entry(inode
, &sb
->s_inodes
, i_sb_list
) {
870 if (!IS_NOQUOTA(inode
))
871 remove_inode_dquot_ref(inode
, type
, tofree_head
);
873 spin_unlock(&inode_lock
);
876 /* Gather all references from inodes and drop them */
877 static void drop_dquot_ref(struct super_block
*sb
, int type
)
879 LIST_HEAD(tofree_head
);
882 down_write(&sb_dqopt(sb
)->dqptr_sem
);
883 remove_dquot_ref(sb
, type
, &tofree_head
);
884 up_write(&sb_dqopt(sb
)->dqptr_sem
);
885 put_dquot_list(&tofree_head
);
889 static inline void dquot_incr_inodes(struct dquot
*dquot
, qsize_t number
)
891 dquot
->dq_dqb
.dqb_curinodes
+= number
;
894 static inline void dquot_incr_space(struct dquot
*dquot
, qsize_t number
)
896 dquot
->dq_dqb
.dqb_curspace
+= number
;
899 static inline void dquot_decr_inodes(struct dquot
*dquot
, qsize_t number
)
901 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
902 dquot
->dq_dqb
.dqb_curinodes
>= number
)
903 dquot
->dq_dqb
.dqb_curinodes
-= number
;
905 dquot
->dq_dqb
.dqb_curinodes
= 0;
906 if (dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
907 dquot
->dq_dqb
.dqb_itime
= (time_t) 0;
908 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
911 static inline void dquot_decr_space(struct dquot
*dquot
, qsize_t number
)
913 if (sb_dqopt(dquot
->dq_sb
)->flags
& DQUOT_NEGATIVE_USAGE
||
914 dquot
->dq_dqb
.dqb_curspace
>= number
)
915 dquot
->dq_dqb
.dqb_curspace
-= number
;
917 dquot
->dq_dqb
.dqb_curspace
= 0;
918 if (dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
919 dquot
->dq_dqb
.dqb_btime
= (time_t) 0;
920 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
923 static int warning_issued(struct dquot
*dquot
, const int warntype
)
925 int flag
= (warntype
== QUOTA_NL_BHARDWARN
||
926 warntype
== QUOTA_NL_BSOFTLONGWARN
) ? DQ_BLKS_B
:
927 ((warntype
== QUOTA_NL_IHARDWARN
||
928 warntype
== QUOTA_NL_ISOFTLONGWARN
) ? DQ_INODES_B
: 0);
932 return test_and_set_bit(flag
, &dquot
->dq_flags
);
935 #ifdef CONFIG_PRINT_QUOTA_WARNING
936 static int flag_print_warnings
= 1;
938 static inline int need_print_warning(struct dquot
*dquot
)
940 if (!flag_print_warnings
)
943 switch (dquot
->dq_type
) {
945 return current_fsuid() == dquot
->dq_id
;
947 return in_group_p(dquot
->dq_id
);
952 /* Print warning to user which exceeded quota */
953 static void print_warning(struct dquot
*dquot
, const int warntype
)
956 struct tty_struct
*tty
;
958 if (warntype
== QUOTA_NL_IHARDBELOW
||
959 warntype
== QUOTA_NL_ISOFTBELOW
||
960 warntype
== QUOTA_NL_BHARDBELOW
||
961 warntype
== QUOTA_NL_BSOFTBELOW
|| !need_print_warning(dquot
))
964 tty
= get_current_tty();
967 tty_write_message(tty
, dquot
->dq_sb
->s_id
);
968 if (warntype
== QUOTA_NL_ISOFTWARN
|| warntype
== QUOTA_NL_BSOFTWARN
)
969 tty_write_message(tty
, ": warning, ");
971 tty_write_message(tty
, ": write failed, ");
972 tty_write_message(tty
, quotatypes
[dquot
->dq_type
]);
974 case QUOTA_NL_IHARDWARN
:
975 msg
= " file limit reached.\r\n";
977 case QUOTA_NL_ISOFTLONGWARN
:
978 msg
= " file quota exceeded too long.\r\n";
980 case QUOTA_NL_ISOFTWARN
:
981 msg
= " file quota exceeded.\r\n";
983 case QUOTA_NL_BHARDWARN
:
984 msg
= " block limit reached.\r\n";
986 case QUOTA_NL_BSOFTLONGWARN
:
987 msg
= " block quota exceeded too long.\r\n";
989 case QUOTA_NL_BSOFTWARN
:
990 msg
= " block quota exceeded.\r\n";
993 tty_write_message(tty
, msg
);
998 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
1000 /* Netlink family structure for quota */
1001 static struct genl_family quota_genl_family
= {
1002 .id
= GENL_ID_GENERATE
,
1004 .name
= "VFS_DQUOT",
1006 .maxattr
= QUOTA_NL_A_MAX
,
1009 /* Send warning to userspace about user which exceeded quota */
1010 static void send_warning(const struct dquot
*dquot
, const char warntype
)
1012 static atomic_t seq
;
1013 struct sk_buff
*skb
;
1016 int msg_size
= 4 * nla_total_size(sizeof(u32
)) +
1017 2 * nla_total_size(sizeof(u64
));
1019 /* We have to allocate using GFP_NOFS as we are called from a
1020 * filesystem performing write and thus further recursion into
1021 * the fs to free some data could cause deadlocks. */
1022 skb
= genlmsg_new(msg_size
, GFP_NOFS
);
1025 "VFS: Not enough memory to send quota warning.\n");
1028 msg_head
= genlmsg_put(skb
, 0, atomic_add_return(1, &seq
),
1029 "a_genl_family
, 0, QUOTA_NL_C_WARNING
);
1032 "VFS: Cannot store netlink header in quota warning.\n");
1035 ret
= nla_put_u32(skb
, QUOTA_NL_A_QTYPE
, dquot
->dq_type
);
1038 ret
= nla_put_u64(skb
, QUOTA_NL_A_EXCESS_ID
, dquot
->dq_id
);
1041 ret
= nla_put_u32(skb
, QUOTA_NL_A_WARNING
, warntype
);
1044 ret
= nla_put_u32(skb
, QUOTA_NL_A_DEV_MAJOR
,
1045 MAJOR(dquot
->dq_sb
->s_dev
));
1048 ret
= nla_put_u32(skb
, QUOTA_NL_A_DEV_MINOR
,
1049 MINOR(dquot
->dq_sb
->s_dev
));
1052 ret
= nla_put_u64(skb
, QUOTA_NL_A_CAUSED_ID
, current_uid());
1055 genlmsg_end(skb
, msg_head
);
1057 ret
= genlmsg_multicast(skb
, 0, quota_genl_family
.id
, GFP_NOFS
);
1058 if (ret
< 0 && ret
!= -ESRCH
)
1060 "VFS: Failed to send notification message: %d\n", ret
);
1063 printk(KERN_ERR
"VFS: Not enough space to compose quota message!\n");
1069 static inline void flush_warnings(struct dquot
* const *dquots
, char *warntype
)
1073 for (i
= 0; i
< MAXQUOTAS
; i
++)
1074 if (dquots
[i
] != NODQUOT
&& warntype
[i
] != QUOTA_NL_NOWARN
&&
1075 !warning_issued(dquots
[i
], warntype
[i
])) {
1076 #ifdef CONFIG_PRINT_QUOTA_WARNING
1077 print_warning(dquots
[i
], warntype
[i
]);
1079 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
1080 send_warning(dquots
[i
], warntype
[i
]);
1085 static inline char ignore_hardlimit(struct dquot
*dquot
)
1087 struct mem_dqinfo
*info
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
1089 return capable(CAP_SYS_RESOURCE
) &&
1090 (info
->dqi_format
->qf_fmt_id
!= QFMT_VFS_OLD
|| !(info
->dqi_flags
& V1_DQF_RSQUASH
));
1093 /* needs dq_data_lock */
1094 static int check_idq(struct dquot
*dquot
, qsize_t inodes
, char *warntype
)
1096 *warntype
= QUOTA_NL_NOWARN
;
1097 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
) ||
1098 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1101 if (dquot
->dq_dqb
.dqb_ihardlimit
&&
1102 (dquot
->dq_dqb
.dqb_curinodes
+ inodes
) > dquot
->dq_dqb
.dqb_ihardlimit
&&
1103 !ignore_hardlimit(dquot
)) {
1104 *warntype
= QUOTA_NL_IHARDWARN
;
1108 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1109 (dquot
->dq_dqb
.dqb_curinodes
+ inodes
) > dquot
->dq_dqb
.dqb_isoftlimit
&&
1110 dquot
->dq_dqb
.dqb_itime
&& get_seconds() >= dquot
->dq_dqb
.dqb_itime
&&
1111 !ignore_hardlimit(dquot
)) {
1112 *warntype
= QUOTA_NL_ISOFTLONGWARN
;
1116 if (dquot
->dq_dqb
.dqb_isoftlimit
&&
1117 (dquot
->dq_dqb
.dqb_curinodes
+ inodes
) > dquot
->dq_dqb
.dqb_isoftlimit
&&
1118 dquot
->dq_dqb
.dqb_itime
== 0) {
1119 *warntype
= QUOTA_NL_ISOFTWARN
;
1120 dquot
->dq_dqb
.dqb_itime
= get_seconds() + sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_igrace
;
1126 /* needs dq_data_lock */
1127 static int check_bdq(struct dquot
*dquot
, qsize_t space
, int prealloc
, char *warntype
)
1129 *warntype
= QUOTA_NL_NOWARN
;
1130 if (!sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
) ||
1131 test_bit(DQ_FAKE_B
, &dquot
->dq_flags
))
1134 if (dquot
->dq_dqb
.dqb_bhardlimit
&&
1135 dquot
->dq_dqb
.dqb_curspace
+ space
> dquot
->dq_dqb
.dqb_bhardlimit
&&
1136 !ignore_hardlimit(dquot
)) {
1138 *warntype
= QUOTA_NL_BHARDWARN
;
1142 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1143 dquot
->dq_dqb
.dqb_curspace
+ space
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1144 dquot
->dq_dqb
.dqb_btime
&& get_seconds() >= dquot
->dq_dqb
.dqb_btime
&&
1145 !ignore_hardlimit(dquot
)) {
1147 *warntype
= QUOTA_NL_BSOFTLONGWARN
;
1151 if (dquot
->dq_dqb
.dqb_bsoftlimit
&&
1152 dquot
->dq_dqb
.dqb_curspace
+ space
> dquot
->dq_dqb
.dqb_bsoftlimit
&&
1153 dquot
->dq_dqb
.dqb_btime
== 0) {
1155 *warntype
= QUOTA_NL_BSOFTWARN
;
1156 dquot
->dq_dqb
.dqb_btime
= get_seconds() + sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
].dqi_bgrace
;
1160 * We don't allow preallocation to exceed softlimit so exceeding will
1169 static int info_idq_free(struct dquot
*dquot
, qsize_t inodes
)
1171 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1172 dquot
->dq_dqb
.dqb_curinodes
<= dquot
->dq_dqb
.dqb_isoftlimit
||
1173 !sb_has_quota_limits_enabled(dquot
->dq_sb
, dquot
->dq_type
))
1174 return QUOTA_NL_NOWARN
;
1176 if (dquot
->dq_dqb
.dqb_curinodes
- inodes
<= dquot
->dq_dqb
.dqb_isoftlimit
)
1177 return QUOTA_NL_ISOFTBELOW
;
1178 if (dquot
->dq_dqb
.dqb_curinodes
>= dquot
->dq_dqb
.dqb_ihardlimit
&&
1179 dquot
->dq_dqb
.dqb_curinodes
- inodes
< dquot
->dq_dqb
.dqb_ihardlimit
)
1180 return QUOTA_NL_IHARDBELOW
;
1181 return QUOTA_NL_NOWARN
;
1184 static int info_bdq_free(struct dquot
*dquot
, qsize_t space
)
1186 if (test_bit(DQ_FAKE_B
, &dquot
->dq_flags
) ||
1187 dquot
->dq_dqb
.dqb_curspace
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1188 return QUOTA_NL_NOWARN
;
1190 if (dquot
->dq_dqb
.dqb_curspace
- space
<= dquot
->dq_dqb
.dqb_bsoftlimit
)
1191 return QUOTA_NL_BSOFTBELOW
;
1192 if (dquot
->dq_dqb
.dqb_curspace
>= dquot
->dq_dqb
.dqb_bhardlimit
&&
1193 dquot
->dq_dqb
.dqb_curspace
- space
< dquot
->dq_dqb
.dqb_bhardlimit
)
1194 return QUOTA_NL_BHARDBELOW
;
1195 return QUOTA_NL_NOWARN
;
1198 * Initialize quota pointers in inode
1199 * Transaction must be started at entry
1201 int dquot_initialize(struct inode
*inode
, int type
)
1203 unsigned int id
= 0;
1206 /* First test before acquiring mutex - solves deadlocks when we
1207 * re-enter the quota code and are already holding the mutex */
1208 if (IS_NOQUOTA(inode
))
1210 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1211 /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
1212 if (IS_NOQUOTA(inode
))
1214 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1215 if (type
!= -1 && cnt
!= type
)
1217 if (inode
->i_dquot
[cnt
] == NODQUOT
) {
1226 inode
->i_dquot
[cnt
] = dqget(inode
->i_sb
, id
, cnt
);
1230 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1235 * Release all quotas referenced by inode
1236 * Transaction must be started at an entry
1238 int dquot_drop_locked(struct inode
*inode
)
1242 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1243 if (inode
->i_dquot
[cnt
] != NODQUOT
) {
1244 dqput(inode
->i_dquot
[cnt
]);
1245 inode
->i_dquot
[cnt
] = NODQUOT
;
1251 int dquot_drop(struct inode
*inode
)
1253 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1254 dquot_drop_locked(inode
);
1255 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1259 /* Wrapper to remove references to quota structures from inode */
1260 void vfs_dq_drop(struct inode
*inode
)
1262 /* Here we can get arbitrary inode from clear_inode() so we have
1263 * to be careful. OTOH we don't need locking as quota operations
1264 * are allowed to change only at mount time */
1265 if (!IS_NOQUOTA(inode
) && inode
->i_sb
&& inode
->i_sb
->dq_op
1266 && inode
->i_sb
->dq_op
->drop
) {
1268 /* Test before calling to rule out calls from proc and such
1269 * where we are not allowed to block. Note that this is
1270 * actually reliable test even without the lock - the caller
1271 * must assure that nobody can come after the DQUOT_DROP and
1272 * add quota pointers back anyway */
1273 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1274 if (inode
->i_dquot
[cnt
] != NODQUOT
)
1276 if (cnt
< MAXQUOTAS
)
1277 inode
->i_sb
->dq_op
->drop(inode
);
1282 * Following four functions update i_blocks+i_bytes fields and
1283 * quota information (together with appropriate checks)
1284 * NOTE: We absolutely rely on the fact that caller dirties
1285 * the inode (usually macros in quotaops.h care about this) and
1286 * holds a handle for the current transaction so that dquot write and
1287 * inode write go into the same transaction.
1291 * This operation can block, but only after everything is updated
1293 int dquot_alloc_space(struct inode
*inode
, qsize_t number
, int warn
)
1295 int cnt
, ret
= NO_QUOTA
;
1296 char warntype
[MAXQUOTAS
];
1298 /* First test before acquiring mutex - solves deadlocks when we
1299 * re-enter the quota code and are already holding the mutex */
1300 if (IS_NOQUOTA(inode
)) {
1302 inode_add_bytes(inode
, number
);
1305 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1306 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1308 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1309 if (IS_NOQUOTA(inode
)) { /* Now we can do reliable test... */
1310 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1313 spin_lock(&dq_data_lock
);
1314 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1315 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1317 if (check_bdq(inode
->i_dquot
[cnt
], number
, warn
, warntype
+cnt
) == NO_QUOTA
)
1320 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1321 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1323 dquot_incr_space(inode
->i_dquot
[cnt
], number
);
1325 inode_add_bytes(inode
, number
);
1328 spin_unlock(&dq_data_lock
);
1329 if (ret
== QUOTA_OK
)
1330 /* Dirtify all the dquots - this can block when journalling */
1331 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1332 if (inode
->i_dquot
[cnt
])
1333 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1334 flush_warnings(inode
->i_dquot
, warntype
);
1335 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1340 * This operation can block, but only after everything is updated
1342 int dquot_alloc_inode(const struct inode
*inode
, qsize_t number
)
1344 int cnt
, ret
= NO_QUOTA
;
1345 char warntype
[MAXQUOTAS
];
1347 /* First test before acquiring mutex - solves deadlocks when we
1348 * re-enter the quota code and are already holding the mutex */
1349 if (IS_NOQUOTA(inode
))
1351 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1352 warntype
[cnt
] = QUOTA_NL_NOWARN
;
1353 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1354 if (IS_NOQUOTA(inode
)) {
1355 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1358 spin_lock(&dq_data_lock
);
1359 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1360 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1362 if (check_idq(inode
->i_dquot
[cnt
], number
, warntype
+cnt
) == NO_QUOTA
)
1366 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1367 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1369 dquot_incr_inodes(inode
->i_dquot
[cnt
], number
);
1373 spin_unlock(&dq_data_lock
);
1374 if (ret
== QUOTA_OK
)
1375 /* Dirtify all the dquots - this can block when journalling */
1376 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1377 if (inode
->i_dquot
[cnt
])
1378 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1379 flush_warnings(inode
->i_dquot
, warntype
);
1380 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1385 * This operation can block, but only after everything is updated
1387 int dquot_free_space(struct inode
*inode
, qsize_t number
)
1390 char warntype
[MAXQUOTAS
];
1392 /* First test before acquiring mutex - solves deadlocks when we
1393 * re-enter the quota code and are already holding the mutex */
1394 if (IS_NOQUOTA(inode
)) {
1396 inode_sub_bytes(inode
, number
);
1400 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1401 /* Now recheck reliably when holding dqptr_sem */
1402 if (IS_NOQUOTA(inode
)) {
1403 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1406 spin_lock(&dq_data_lock
);
1407 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1408 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1410 warntype
[cnt
] = info_bdq_free(inode
->i_dquot
[cnt
], number
);
1411 dquot_decr_space(inode
->i_dquot
[cnt
], number
);
1413 inode_sub_bytes(inode
, number
);
1414 spin_unlock(&dq_data_lock
);
1415 /* Dirtify all the dquots - this can block when journalling */
1416 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1417 if (inode
->i_dquot
[cnt
])
1418 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1419 flush_warnings(inode
->i_dquot
, warntype
);
1420 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1425 * This operation can block, but only after everything is updated
1427 int dquot_free_inode(const struct inode
*inode
, qsize_t number
)
1430 char warntype
[MAXQUOTAS
];
1432 /* First test before acquiring mutex - solves deadlocks when we
1433 * re-enter the quota code and are already holding the mutex */
1434 if (IS_NOQUOTA(inode
))
1437 down_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1438 /* Now recheck reliably when holding dqptr_sem */
1439 if (IS_NOQUOTA(inode
)) {
1440 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1443 spin_lock(&dq_data_lock
);
1444 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1445 if (inode
->i_dquot
[cnt
] == NODQUOT
)
1447 warntype
[cnt
] = info_idq_free(inode
->i_dquot
[cnt
], number
);
1448 dquot_decr_inodes(inode
->i_dquot
[cnt
], number
);
1450 spin_unlock(&dq_data_lock
);
1451 /* Dirtify all the dquots - this can block when journalling */
1452 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1453 if (inode
->i_dquot
[cnt
])
1454 mark_dquot_dirty(inode
->i_dquot
[cnt
]);
1455 flush_warnings(inode
->i_dquot
, warntype
);
1456 up_read(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1461 * Transfer the number of inode and blocks from one diskquota to an other.
1463 * This operation can block, but only after everything is updated
1464 * A transaction must be started when entering this function.
1466 int dquot_transfer(struct inode
*inode
, struct iattr
*iattr
)
1469 struct dquot
*transfer_from
[MAXQUOTAS
];
1470 struct dquot
*transfer_to
[MAXQUOTAS
];
1471 int cnt
, ret
= NO_QUOTA
, chuid
= (iattr
->ia_valid
& ATTR_UID
) && inode
->i_uid
!= iattr
->ia_uid
,
1472 chgid
= (iattr
->ia_valid
& ATTR_GID
) && inode
->i_gid
!= iattr
->ia_gid
;
1473 char warntype_to
[MAXQUOTAS
];
1474 char warntype_from_inodes
[MAXQUOTAS
], warntype_from_space
[MAXQUOTAS
];
1476 /* First test before acquiring mutex - solves deadlocks when we
1477 * re-enter the quota code and are already holding the mutex */
1478 if (IS_NOQUOTA(inode
))
1480 /* Clear the arrays */
1481 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1482 transfer_to
[cnt
] = transfer_from
[cnt
] = NODQUOT
;
1483 warntype_to
[cnt
] = QUOTA_NL_NOWARN
;
1485 down_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1486 /* Now recheck reliably when holding dqptr_sem */
1487 if (IS_NOQUOTA(inode
)) { /* File without quota accounting? */
1488 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1491 /* First build the transfer_to list - here we can block on
1492 * reading/instantiating of dquots. We know that the transaction for
1493 * us was already started so we don't violate lock ranking here */
1494 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1499 transfer_to
[cnt
] = dqget(inode
->i_sb
, iattr
->ia_uid
, cnt
);
1504 transfer_to
[cnt
] = dqget(inode
->i_sb
, iattr
->ia_gid
, cnt
);
1508 spin_lock(&dq_data_lock
);
1509 space
= inode_get_bytes(inode
);
1510 /* Build the transfer_from list and check the limits */
1511 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1512 if (transfer_to
[cnt
] == NODQUOT
)
1514 transfer_from
[cnt
] = inode
->i_dquot
[cnt
];
1515 if (check_idq(transfer_to
[cnt
], 1, warntype_to
+ cnt
) ==
1516 NO_QUOTA
|| check_bdq(transfer_to
[cnt
], space
, 0,
1517 warntype_to
+ cnt
) == NO_QUOTA
)
1522 * Finally perform the needed transfer from transfer_from to transfer_to
1524 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1526 * Skip changes for same uid or gid or for turned off quota-type.
1528 if (transfer_to
[cnt
] == NODQUOT
)
1531 /* Due to IO error we might not have transfer_from[] structure */
1532 if (transfer_from
[cnt
]) {
1533 warntype_from_inodes
[cnt
] =
1534 info_idq_free(transfer_from
[cnt
], 1);
1535 warntype_from_space
[cnt
] =
1536 info_bdq_free(transfer_from
[cnt
], space
);
1537 dquot_decr_inodes(transfer_from
[cnt
], 1);
1538 dquot_decr_space(transfer_from
[cnt
], space
);
1541 dquot_incr_inodes(transfer_to
[cnt
], 1);
1542 dquot_incr_space(transfer_to
[cnt
], space
);
1544 inode
->i_dquot
[cnt
] = transfer_to
[cnt
];
1548 spin_unlock(&dq_data_lock
);
1549 /* Dirtify all the dquots - this can block when journalling */
1550 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1551 if (transfer_from
[cnt
])
1552 mark_dquot_dirty(transfer_from
[cnt
]);
1553 if (transfer_to
[cnt
])
1554 mark_dquot_dirty(transfer_to
[cnt
]);
1556 flush_warnings(transfer_to
, warntype_to
);
1557 flush_warnings(transfer_from
, warntype_from_inodes
);
1558 flush_warnings(transfer_from
, warntype_from_space
);
1560 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1561 if (ret
== QUOTA_OK
&& transfer_from
[cnt
] != NODQUOT
)
1562 dqput(transfer_from
[cnt
]);
1563 if (ret
== NO_QUOTA
&& transfer_to
[cnt
] != NODQUOT
)
1564 dqput(transfer_to
[cnt
]);
1566 up_write(&sb_dqopt(inode
->i_sb
)->dqptr_sem
);
1570 /* Wrapper for transferring ownership of an inode */
1571 int vfs_dq_transfer(struct inode
*inode
, struct iattr
*iattr
)
1573 if (sb_any_quota_active(inode
->i_sb
) && !IS_NOQUOTA(inode
)) {
1575 if (inode
->i_sb
->dq_op
->transfer(inode
, iattr
) == NO_QUOTA
)
1583 * Write info of quota file to disk
1585 int dquot_commit_info(struct super_block
*sb
, int type
)
1588 struct quota_info
*dqopt
= sb_dqopt(sb
);
1590 mutex_lock(&dqopt
->dqio_mutex
);
1591 ret
= dqopt
->ops
[type
]->write_file_info(sb
, type
);
1592 mutex_unlock(&dqopt
->dqio_mutex
);
1597 * Definitions of diskquota operations.
1599 struct dquot_operations dquot_operations
= {
1600 .initialize
= dquot_initialize
,
1602 .alloc_space
= dquot_alloc_space
,
1603 .alloc_inode
= dquot_alloc_inode
,
1604 .free_space
= dquot_free_space
,
1605 .free_inode
= dquot_free_inode
,
1606 .transfer
= dquot_transfer
,
1607 .write_dquot
= dquot_commit
,
1608 .acquire_dquot
= dquot_acquire
,
1609 .release_dquot
= dquot_release
,
1610 .mark_dirty
= dquot_mark_dquot_dirty
,
1611 .write_info
= dquot_commit_info
,
1612 .alloc_dquot
= dquot_alloc
,
1613 .destroy_dquot
= dquot_destroy
,
1617 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1619 int vfs_quota_disable(struct super_block
*sb
, int type
, unsigned int flags
)
1622 struct quota_info
*dqopt
= sb_dqopt(sb
);
1623 struct inode
*toputinode
[MAXQUOTAS
];
1625 /* Cannot turn off usage accounting without turning off limits, or
1626 * suspend quotas and simultaneously turn quotas off. */
1627 if ((flags
& DQUOT_USAGE_ENABLED
&& !(flags
& DQUOT_LIMITS_ENABLED
))
1628 || (flags
& DQUOT_SUSPENDED
&& flags
& (DQUOT_LIMITS_ENABLED
|
1629 DQUOT_USAGE_ENABLED
)))
1632 /* We need to serialize quota_off() for device */
1633 mutex_lock(&dqopt
->dqonoff_mutex
);
1636 * Skip everything if there's nothing to do. We have to do this because
1637 * sometimes we are called when fill_super() failed and calling
1638 * sync_fs() in such cases does no good.
1640 if (!sb_any_quota_loaded(sb
)) {
1641 mutex_unlock(&dqopt
->dqonoff_mutex
);
1644 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
1645 toputinode
[cnt
] = NULL
;
1646 if (type
!= -1 && cnt
!= type
)
1648 if (!sb_has_quota_loaded(sb
, cnt
))
1651 if (flags
& DQUOT_SUSPENDED
) {
1653 dquot_state_flag(DQUOT_SUSPENDED
, cnt
);
1655 dqopt
->flags
&= ~dquot_state_flag(flags
, cnt
);
1656 /* Turning off suspended quotas? */
1657 if (!sb_has_quota_loaded(sb
, cnt
) &&
1658 sb_has_quota_suspended(sb
, cnt
)) {
1659 dqopt
->flags
&= ~dquot_state_flag(
1660 DQUOT_SUSPENDED
, cnt
);
1661 iput(dqopt
->files
[cnt
]);
1662 dqopt
->files
[cnt
] = NULL
;
1667 /* We still have to keep quota loaded? */
1668 if (sb_has_quota_loaded(sb
, cnt
) && !(flags
& DQUOT_SUSPENDED
))
1671 /* Note: these are blocking operations */
1672 drop_dquot_ref(sb
, cnt
);
1673 invalidate_dquots(sb
, cnt
);
1675 * Now all dquots should be invalidated, all writes done so we should be only
1676 * users of the info. No locks needed.
1678 if (info_dirty(&dqopt
->info
[cnt
]))
1679 sb
->dq_op
->write_info(sb
, cnt
);
1680 if (dqopt
->ops
[cnt
]->free_file_info
)
1681 dqopt
->ops
[cnt
]->free_file_info(sb
, cnt
);
1682 put_quota_format(dqopt
->info
[cnt
].dqi_format
);
1684 toputinode
[cnt
] = dqopt
->files
[cnt
];
1685 if (!sb_has_quota_loaded(sb
, cnt
))
1686 dqopt
->files
[cnt
] = NULL
;
1687 dqopt
->info
[cnt
].dqi_flags
= 0;
1688 dqopt
->info
[cnt
].dqi_igrace
= 0;
1689 dqopt
->info
[cnt
].dqi_bgrace
= 0;
1690 dqopt
->ops
[cnt
] = NULL
;
1692 mutex_unlock(&dqopt
->dqonoff_mutex
);
1694 /* Skip syncing and setting flags if quota files are hidden */
1695 if (dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)
1698 /* Sync the superblock so that buffers with quota data are written to
1699 * disk (and so userspace sees correct data afterwards). */
1700 if (sb
->s_op
->sync_fs
)
1701 sb
->s_op
->sync_fs(sb
, 1);
1702 sync_blockdev(sb
->s_bdev
);
1703 /* Now the quota files are just ordinary files and we can set the
1704 * inode flags back. Moreover we discard the pagecache so that
1705 * userspace sees the writes we did bypassing the pagecache. We
1706 * must also discard the blockdev buffers so that we see the
1707 * changes done by userspace on the next quotaon() */
1708 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1709 if (toputinode
[cnt
]) {
1710 mutex_lock(&dqopt
->dqonoff_mutex
);
1711 /* If quota was reenabled in the meantime, we have
1713 if (!sb_has_quota_loaded(sb
, cnt
)) {
1714 mutex_lock_nested(&toputinode
[cnt
]->i_mutex
, I_MUTEX_QUOTA
);
1715 toputinode
[cnt
]->i_flags
&= ~(S_IMMUTABLE
|
1716 S_NOATIME
| S_NOQUOTA
);
1717 truncate_inode_pages(&toputinode
[cnt
]->i_data
, 0);
1718 mutex_unlock(&toputinode
[cnt
]->i_mutex
);
1719 mark_inode_dirty(toputinode
[cnt
]);
1721 mutex_unlock(&dqopt
->dqonoff_mutex
);
1724 invalidate_bdev(sb
->s_bdev
);
1726 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++)
1727 if (toputinode
[cnt
]) {
1728 /* On remount RO, we keep the inode pointer so that we
1729 * can reenable quota on the subsequent remount RW. We
1730 * have to check 'flags' variable and not use sb_has_
1731 * function because another quotaon / quotaoff could
1732 * change global state before we got here. We refuse
1733 * to suspend quotas when there is pending delete on
1734 * the quota file... */
1735 if (!(flags
& DQUOT_SUSPENDED
))
1736 iput(toputinode
[cnt
]);
1737 else if (!toputinode
[cnt
]->i_nlink
)
1743 int vfs_quota_off(struct super_block
*sb
, int type
, int remount
)
1745 return vfs_quota_disable(sb
, type
, remount
? DQUOT_SUSPENDED
:
1746 (DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
));
1750 * Turn quotas on on a device
1754 * Helper function to turn quotas on when we already have the inode of
1755 * quota file and no quota information is loaded.
1757 static int vfs_load_quota_inode(struct inode
*inode
, int type
, int format_id
,
1760 struct quota_format_type
*fmt
= find_quota_format(format_id
);
1761 struct super_block
*sb
= inode
->i_sb
;
1762 struct quota_info
*dqopt
= sb_dqopt(sb
);
1768 if (!S_ISREG(inode
->i_mode
)) {
1772 if (IS_RDONLY(inode
)) {
1776 if (!sb
->s_op
->quota_write
|| !sb
->s_op
->quota_read
) {
1780 /* Usage always has to be set... */
1781 if (!(flags
& DQUOT_USAGE_ENABLED
)) {
1786 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
1787 /* As we bypass the pagecache we must now flush the inode so
1788 * that we see all the changes from userspace... */
1789 write_inode_now(inode
, 1);
1790 /* And now flush the block cache so that kernel sees the
1792 invalidate_bdev(sb
->s_bdev
);
1794 mutex_lock(&inode
->i_mutex
);
1795 mutex_lock(&dqopt
->dqonoff_mutex
);
1796 if (sb_has_quota_loaded(sb
, type
)) {
1801 if (!(dqopt
->flags
& DQUOT_QUOTA_SYS_FILE
)) {
1802 /* We don't want quota and atime on quota files (deadlocks
1803 * possible) Also nobody should write to the file - we use
1804 * special IO operations which ignore the immutable bit. */
1805 down_write(&dqopt
->dqptr_sem
);
1806 oldflags
= inode
->i_flags
& (S_NOATIME
| S_IMMUTABLE
| S_NOQUOTA
);
1807 inode
->i_flags
|= S_NOQUOTA
| S_NOATIME
| S_IMMUTABLE
;
1808 up_write(&dqopt
->dqptr_sem
);
1809 sb
->dq_op
->drop(inode
);
1813 dqopt
->files
[type
] = igrab(inode
);
1814 if (!dqopt
->files
[type
])
1817 if (!fmt
->qf_ops
->check_quota_file(sb
, type
))
1820 dqopt
->ops
[type
] = fmt
->qf_ops
;
1821 dqopt
->info
[type
].dqi_format
= fmt
;
1822 dqopt
->info
[type
].dqi_fmt_id
= format_id
;
1823 INIT_LIST_HEAD(&dqopt
->info
[type
].dqi_dirty_list
);
1824 mutex_lock(&dqopt
->dqio_mutex
);
1825 if ((error
= dqopt
->ops
[type
]->read_file_info(sb
, type
)) < 0) {
1826 mutex_unlock(&dqopt
->dqio_mutex
);
1829 mutex_unlock(&dqopt
->dqio_mutex
);
1830 mutex_unlock(&inode
->i_mutex
);
1831 dqopt
->flags
|= dquot_state_flag(flags
, type
);
1833 add_dquot_ref(sb
, type
);
1834 mutex_unlock(&dqopt
->dqonoff_mutex
);
1839 dqopt
->files
[type
] = NULL
;
1842 mutex_unlock(&dqopt
->dqonoff_mutex
);
1843 if (oldflags
!= -1) {
1844 down_write(&dqopt
->dqptr_sem
);
1845 /* Set the flags back (in the case of accidental quotaon()
1846 * on a wrong file we don't want to mess up the flags) */
1847 inode
->i_flags
&= ~(S_NOATIME
| S_NOQUOTA
| S_IMMUTABLE
);
1848 inode
->i_flags
|= oldflags
;
1849 up_write(&dqopt
->dqptr_sem
);
1851 mutex_unlock(&inode
->i_mutex
);
1853 put_quota_format(fmt
);
1858 /* Reenable quotas on remount RW */
1859 static int vfs_quota_on_remount(struct super_block
*sb
, int type
)
1861 struct quota_info
*dqopt
= sb_dqopt(sb
);
1862 struct inode
*inode
;
1866 mutex_lock(&dqopt
->dqonoff_mutex
);
1867 if (!sb_has_quota_suspended(sb
, type
)) {
1868 mutex_unlock(&dqopt
->dqonoff_mutex
);
1871 inode
= dqopt
->files
[type
];
1872 dqopt
->files
[type
] = NULL
;
1873 flags
= dqopt
->flags
& dquot_state_flag(DQUOT_USAGE_ENABLED
|
1874 DQUOT_LIMITS_ENABLED
, type
);
1875 dqopt
->flags
&= ~dquot_state_flag(DQUOT_STATE_FLAGS
, type
);
1876 mutex_unlock(&dqopt
->dqonoff_mutex
);
1878 flags
= dquot_generic_flag(flags
, type
);
1879 ret
= vfs_load_quota_inode(inode
, type
, dqopt
->info
[type
].dqi_fmt_id
,
1886 int vfs_quota_on_path(struct super_block
*sb
, int type
, int format_id
,
1889 int error
= security_quota_on(path
->dentry
);
1892 /* Quota file not on the same filesystem? */
1893 if (path
->mnt
->mnt_sb
!= sb
)
1896 error
= vfs_load_quota_inode(path
->dentry
->d_inode
, type
,
1897 format_id
, DQUOT_USAGE_ENABLED
|
1898 DQUOT_LIMITS_ENABLED
);
1902 int vfs_quota_on(struct super_block
*sb
, int type
, int format_id
, char *name
,
1909 return vfs_quota_on_remount(sb
, type
);
1911 error
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
1913 error
= vfs_quota_on_path(sb
, type
, format_id
, &path
);
1920 * More powerful function for turning on quotas allowing setting
1921 * of individual quota flags
1923 int vfs_quota_enable(struct inode
*inode
, int type
, int format_id
,
1927 struct super_block
*sb
= inode
->i_sb
;
1928 struct quota_info
*dqopt
= sb_dqopt(sb
);
1930 /* Just unsuspend quotas? */
1931 if (flags
& DQUOT_SUSPENDED
)
1932 return vfs_quota_on_remount(sb
, type
);
1935 /* Just updating flags needed? */
1936 if (sb_has_quota_loaded(sb
, type
)) {
1937 mutex_lock(&dqopt
->dqonoff_mutex
);
1938 /* Now do a reliable test... */
1939 if (!sb_has_quota_loaded(sb
, type
)) {
1940 mutex_unlock(&dqopt
->dqonoff_mutex
);
1943 if (flags
& DQUOT_USAGE_ENABLED
&&
1944 sb_has_quota_usage_enabled(sb
, type
)) {
1948 if (flags
& DQUOT_LIMITS_ENABLED
&&
1949 sb_has_quota_limits_enabled(sb
, type
)) {
1953 sb_dqopt(sb
)->flags
|= dquot_state_flag(flags
, type
);
1955 mutex_unlock(&dqopt
->dqonoff_mutex
);
1960 return vfs_load_quota_inode(inode
, type
, format_id
, flags
);
1964 * This function is used when filesystem needs to initialize quotas
1965 * during mount time.
1967 int vfs_quota_on_mount(struct super_block
*sb
, char *qf_name
,
1968 int format_id
, int type
)
1970 struct dentry
*dentry
;
1973 dentry
= lookup_one_len(qf_name
, sb
->s_root
, strlen(qf_name
));
1975 return PTR_ERR(dentry
);
1977 if (!dentry
->d_inode
) {
1982 error
= security_quota_on(dentry
);
1984 error
= vfs_load_quota_inode(dentry
->d_inode
, type
, format_id
,
1985 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
1992 /* Wrapper to turn on quotas when remounting rw */
1993 int vfs_dq_quota_on_remount(struct super_block
*sb
)
1998 if (!sb
->s_qcop
|| !sb
->s_qcop
->quota_on
)
2000 for (cnt
= 0; cnt
< MAXQUOTAS
; cnt
++) {
2001 err
= sb
->s_qcop
->quota_on(sb
, cnt
, 0, NULL
, 1);
2002 if (err
< 0 && !ret
)
2008 static inline qsize_t
qbtos(qsize_t blocks
)
2010 return blocks
<< QIF_DQBLKSIZE_BITS
;
2013 static inline qsize_t
stoqb(qsize_t space
)
2015 return (space
+ QIF_DQBLKSIZE
- 1) >> QIF_DQBLKSIZE_BITS
;
2018 /* Generic routine for getting common part of quota structure */
2019 static void do_get_dqblk(struct dquot
*dquot
, struct if_dqblk
*di
)
2021 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2023 spin_lock(&dq_data_lock
);
2024 di
->dqb_bhardlimit
= stoqb(dm
->dqb_bhardlimit
);
2025 di
->dqb_bsoftlimit
= stoqb(dm
->dqb_bsoftlimit
);
2026 di
->dqb_curspace
= dm
->dqb_curspace
;
2027 di
->dqb_ihardlimit
= dm
->dqb_ihardlimit
;
2028 di
->dqb_isoftlimit
= dm
->dqb_isoftlimit
;
2029 di
->dqb_curinodes
= dm
->dqb_curinodes
;
2030 di
->dqb_btime
= dm
->dqb_btime
;
2031 di
->dqb_itime
= dm
->dqb_itime
;
2032 di
->dqb_valid
= QIF_ALL
;
2033 spin_unlock(&dq_data_lock
);
2036 int vfs_get_dqblk(struct super_block
*sb
, int type
, qid_t id
, struct if_dqblk
*di
)
2038 struct dquot
*dquot
;
2040 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2041 if (!(dquot
= dqget(sb
, id
, type
))) {
2042 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2045 do_get_dqblk(dquot
, di
);
2047 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2051 /* Generic routine for setting common part of quota structure */
2052 static int do_set_dqblk(struct dquot
*dquot
, struct if_dqblk
*di
)
2054 struct mem_dqblk
*dm
= &dquot
->dq_dqb
;
2055 int check_blim
= 0, check_ilim
= 0;
2056 struct mem_dqinfo
*dqi
= &sb_dqopt(dquot
->dq_sb
)->info
[dquot
->dq_type
];
2058 if ((di
->dqb_valid
& QIF_BLIMITS
&&
2059 (di
->dqb_bhardlimit
> dqi
->dqi_maxblimit
||
2060 di
->dqb_bsoftlimit
> dqi
->dqi_maxblimit
)) ||
2061 (di
->dqb_valid
& QIF_ILIMITS
&&
2062 (di
->dqb_ihardlimit
> dqi
->dqi_maxilimit
||
2063 di
->dqb_isoftlimit
> dqi
->dqi_maxilimit
)))
2066 spin_lock(&dq_data_lock
);
2067 if (di
->dqb_valid
& QIF_SPACE
) {
2068 dm
->dqb_curspace
= di
->dqb_curspace
;
2070 __set_bit(DQ_LASTSET_B
+ QIF_SPACE_B
, &dquot
->dq_flags
);
2072 if (di
->dqb_valid
& QIF_BLIMITS
) {
2073 dm
->dqb_bsoftlimit
= qbtos(di
->dqb_bsoftlimit
);
2074 dm
->dqb_bhardlimit
= qbtos(di
->dqb_bhardlimit
);
2076 __set_bit(DQ_LASTSET_B
+ QIF_BLIMITS_B
, &dquot
->dq_flags
);
2078 if (di
->dqb_valid
& QIF_INODES
) {
2079 dm
->dqb_curinodes
= di
->dqb_curinodes
;
2081 __set_bit(DQ_LASTSET_B
+ QIF_INODES_B
, &dquot
->dq_flags
);
2083 if (di
->dqb_valid
& QIF_ILIMITS
) {
2084 dm
->dqb_isoftlimit
= di
->dqb_isoftlimit
;
2085 dm
->dqb_ihardlimit
= di
->dqb_ihardlimit
;
2087 __set_bit(DQ_LASTSET_B
+ QIF_ILIMITS_B
, &dquot
->dq_flags
);
2089 if (di
->dqb_valid
& QIF_BTIME
) {
2090 dm
->dqb_btime
= di
->dqb_btime
;
2091 __set_bit(DQ_LASTSET_B
+ QIF_BTIME_B
, &dquot
->dq_flags
);
2093 if (di
->dqb_valid
& QIF_ITIME
) {
2094 dm
->dqb_itime
= di
->dqb_itime
;
2095 __set_bit(DQ_LASTSET_B
+ QIF_ITIME_B
, &dquot
->dq_flags
);
2099 if (!dm
->dqb_bsoftlimit
|| dm
->dqb_curspace
< dm
->dqb_bsoftlimit
) {
2101 clear_bit(DQ_BLKS_B
, &dquot
->dq_flags
);
2103 else if (!(di
->dqb_valid
& QIF_BTIME
)) /* Set grace only if user hasn't provided his own... */
2104 dm
->dqb_btime
= get_seconds() + dqi
->dqi_bgrace
;
2107 if (!dm
->dqb_isoftlimit
|| dm
->dqb_curinodes
< dm
->dqb_isoftlimit
) {
2109 clear_bit(DQ_INODES_B
, &dquot
->dq_flags
);
2111 else if (!(di
->dqb_valid
& QIF_ITIME
)) /* Set grace only if user hasn't provided his own... */
2112 dm
->dqb_itime
= get_seconds() + dqi
->dqi_igrace
;
2114 if (dm
->dqb_bhardlimit
|| dm
->dqb_bsoftlimit
|| dm
->dqb_ihardlimit
|| dm
->dqb_isoftlimit
)
2115 clear_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2117 set_bit(DQ_FAKE_B
, &dquot
->dq_flags
);
2118 spin_unlock(&dq_data_lock
);
2119 mark_dquot_dirty(dquot
);
2124 int vfs_set_dqblk(struct super_block
*sb
, int type
, qid_t id
, struct if_dqblk
*di
)
2126 struct dquot
*dquot
;
2129 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2130 dquot
= dqget(sb
, id
, type
);
2135 rc
= do_set_dqblk(dquot
, di
);
2138 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2142 /* Generic routine for getting common part of quota file information */
2143 int vfs_get_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2145 struct mem_dqinfo
*mi
;
2147 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2148 if (!sb_has_quota_active(sb
, type
)) {
2149 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2152 mi
= sb_dqopt(sb
)->info
+ type
;
2153 spin_lock(&dq_data_lock
);
2154 ii
->dqi_bgrace
= mi
->dqi_bgrace
;
2155 ii
->dqi_igrace
= mi
->dqi_igrace
;
2156 ii
->dqi_flags
= mi
->dqi_flags
& DQF_MASK
;
2157 ii
->dqi_valid
= IIF_ALL
;
2158 spin_unlock(&dq_data_lock
);
2159 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2163 /* Generic routine for setting common part of quota file information */
2164 int vfs_set_dqinfo(struct super_block
*sb
, int type
, struct if_dqinfo
*ii
)
2166 struct mem_dqinfo
*mi
;
2169 mutex_lock(&sb_dqopt(sb
)->dqonoff_mutex
);
2170 if (!sb_has_quota_active(sb
, type
)) {
2174 mi
= sb_dqopt(sb
)->info
+ type
;
2175 spin_lock(&dq_data_lock
);
2176 if (ii
->dqi_valid
& IIF_BGRACE
)
2177 mi
->dqi_bgrace
= ii
->dqi_bgrace
;
2178 if (ii
->dqi_valid
& IIF_IGRACE
)
2179 mi
->dqi_igrace
= ii
->dqi_igrace
;
2180 if (ii
->dqi_valid
& IIF_FLAGS
)
2181 mi
->dqi_flags
= (mi
->dqi_flags
& ~DQF_MASK
) | (ii
->dqi_flags
& DQF_MASK
);
2182 spin_unlock(&dq_data_lock
);
2183 mark_info_dirty(sb
, type
);
2184 /* Force write to disk */
2185 sb
->dq_op
->write_info(sb
, type
);
2187 mutex_unlock(&sb_dqopt(sb
)->dqonoff_mutex
);
2191 struct quotactl_ops vfs_quotactl_ops
= {
2192 .quota_on
= vfs_quota_on
,
2193 .quota_off
= vfs_quota_off
,
2194 .quota_sync
= vfs_quota_sync
,
2195 .get_info
= vfs_get_dqinfo
,
2196 .set_info
= vfs_set_dqinfo
,
2197 .get_dqblk
= vfs_get_dqblk
,
2198 .set_dqblk
= vfs_set_dqblk
2201 static ctl_table fs_dqstats_table
[] = {
2203 .ctl_name
= FS_DQ_LOOKUPS
,
2204 .procname
= "lookups",
2205 .data
= &dqstats
.lookups
,
2206 .maxlen
= sizeof(int),
2208 .proc_handler
= &proc_dointvec
,
2211 .ctl_name
= FS_DQ_DROPS
,
2212 .procname
= "drops",
2213 .data
= &dqstats
.drops
,
2214 .maxlen
= sizeof(int),
2216 .proc_handler
= &proc_dointvec
,
2219 .ctl_name
= FS_DQ_READS
,
2220 .procname
= "reads",
2221 .data
= &dqstats
.reads
,
2222 .maxlen
= sizeof(int),
2224 .proc_handler
= &proc_dointvec
,
2227 .ctl_name
= FS_DQ_WRITES
,
2228 .procname
= "writes",
2229 .data
= &dqstats
.writes
,
2230 .maxlen
= sizeof(int),
2232 .proc_handler
= &proc_dointvec
,
2235 .ctl_name
= FS_DQ_CACHE_HITS
,
2236 .procname
= "cache_hits",
2237 .data
= &dqstats
.cache_hits
,
2238 .maxlen
= sizeof(int),
2240 .proc_handler
= &proc_dointvec
,
2243 .ctl_name
= FS_DQ_ALLOCATED
,
2244 .procname
= "allocated_dquots",
2245 .data
= &dqstats
.allocated_dquots
,
2246 .maxlen
= sizeof(int),
2248 .proc_handler
= &proc_dointvec
,
2251 .ctl_name
= FS_DQ_FREE
,
2252 .procname
= "free_dquots",
2253 .data
= &dqstats
.free_dquots
,
2254 .maxlen
= sizeof(int),
2256 .proc_handler
= &proc_dointvec
,
2259 .ctl_name
= FS_DQ_SYNCS
,
2260 .procname
= "syncs",
2261 .data
= &dqstats
.syncs
,
2262 .maxlen
= sizeof(int),
2264 .proc_handler
= &proc_dointvec
,
2266 #ifdef CONFIG_PRINT_QUOTA_WARNING
2268 .ctl_name
= FS_DQ_WARNINGS
,
2269 .procname
= "warnings",
2270 .data
= &flag_print_warnings
,
2271 .maxlen
= sizeof(int),
2273 .proc_handler
= &proc_dointvec
,
2279 static ctl_table fs_table
[] = {
2281 .ctl_name
= FS_DQSTATS
,
2282 .procname
= "quota",
2284 .child
= fs_dqstats_table
,
2289 static ctl_table sys_table
[] = {
2299 static int __init
dquot_init(void)
2302 unsigned long nr_hash
, order
;
2304 printk(KERN_NOTICE
"VFS: Disk quotas %s\n", __DQUOT_VERSION__
);
2306 register_sysctl_table(sys_table
);
2308 dquot_cachep
= kmem_cache_create("dquot",
2309 sizeof(struct dquot
), sizeof(unsigned long) * 4,
2310 (SLAB_HWCACHE_ALIGN
|SLAB_RECLAIM_ACCOUNT
|
2311 SLAB_MEM_SPREAD
|SLAB_PANIC
),
2315 dquot_hash
= (struct hlist_head
*)__get_free_pages(GFP_ATOMIC
, order
);
2317 panic("Cannot create dquot hash table");
2319 /* Find power-of-two hlist_heads which can fit into allocation */
2320 nr_hash
= (1UL << order
) * PAGE_SIZE
/ sizeof(struct hlist_head
);
2324 } while (nr_hash
>> dq_hash_bits
);
2327 nr_hash
= 1UL << dq_hash_bits
;
2328 dq_hash_mask
= nr_hash
- 1;
2329 for (i
= 0; i
< nr_hash
; i
++)
2330 INIT_HLIST_HEAD(dquot_hash
+ i
);
2332 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2333 nr_hash
, order
, (PAGE_SIZE
<< order
));
2335 register_shrinker(&dqcache_shrinker
);
2337 #ifdef CONFIG_QUOTA_NETLINK_INTERFACE
2338 if (genl_register_family("a_genl_family
) != 0)
2339 printk(KERN_ERR
"VFS: Failed to create quota netlink interface.\n");
2344 module_init(dquot_init
);
2346 EXPORT_SYMBOL(register_quota_format
);
2347 EXPORT_SYMBOL(unregister_quota_format
);
2348 EXPORT_SYMBOL(dqstats
);
2349 EXPORT_SYMBOL(dq_data_lock
);
2350 EXPORT_SYMBOL(vfs_quota_enable
);
2351 EXPORT_SYMBOL(vfs_quota_on
);
2352 EXPORT_SYMBOL(vfs_quota_on_path
);
2353 EXPORT_SYMBOL(vfs_quota_on_mount
);
2354 EXPORT_SYMBOL(vfs_quota_disable
);
2355 EXPORT_SYMBOL(vfs_quota_off
);
2356 EXPORT_SYMBOL(dquot_scan_active
);
2357 EXPORT_SYMBOL(vfs_quota_sync
);
2358 EXPORT_SYMBOL(vfs_get_dqinfo
);
2359 EXPORT_SYMBOL(vfs_set_dqinfo
);
2360 EXPORT_SYMBOL(vfs_get_dqblk
);
2361 EXPORT_SYMBOL(vfs_set_dqblk
);
2362 EXPORT_SYMBOL(dquot_commit
);
2363 EXPORT_SYMBOL(dquot_commit_info
);
2364 EXPORT_SYMBOL(dquot_acquire
);
2365 EXPORT_SYMBOL(dquot_release
);
2366 EXPORT_SYMBOL(dquot_mark_dquot_dirty
);
2367 EXPORT_SYMBOL(dquot_initialize
);
2368 EXPORT_SYMBOL(dquot_drop
);
2369 EXPORT_SYMBOL(dquot_drop_locked
);
2370 EXPORT_SYMBOL(vfs_dq_drop
);
2371 EXPORT_SYMBOL(dqget
);
2372 EXPORT_SYMBOL(dqput
);
2373 EXPORT_SYMBOL(dquot_is_cached
);
2374 EXPORT_SYMBOL(dquot_alloc_space
);
2375 EXPORT_SYMBOL(dquot_alloc_inode
);
2376 EXPORT_SYMBOL(dquot_free_space
);
2377 EXPORT_SYMBOL(dquot_free_inode
);
2378 EXPORT_SYMBOL(dquot_transfer
);
2379 EXPORT_SYMBOL(vfs_dq_transfer
);
2380 EXPORT_SYMBOL(vfs_dq_quota_on_remount
);