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/sched.h>
75 #include <linux/cred.h>
76 #include <linux/kmod.h>
77 #include <linux/namei.h>
78 #include <linux/capability.h>
79 #include <linux/quotaops.h>
80 #include "../internal.h" /* ugh */
82 #include <linux/uaccess.h>
85 * There are three quota SMP locks. dq_list_lock protects all lists with quotas
87 * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
88 * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
89 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
90 * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
91 * modifications of quota state (on quotaon and quotaoff) and readers who care
92 * about latest values take it as well.
94 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
95 * dq_list_lock > dq_state_lock
97 * Note that some things (eg. sb pointer, type, id) doesn't change during
98 * the life of the dquot structure and so needn't to be protected by a lock
100 * Operation accessing dquots via inode pointers are protected by dquot_srcu.
101 * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and
102 * synchronize_srcu(&dquot_srcu) is called after clearing pointers from
103 * inode and before dropping dquot references to avoid use of dquots after
104 * they are freed. dq_data_lock is used to serialize the pointer setting and
105 * clearing operations.
106 * Special care needs to be taken about S_NOQUOTA inode flag (marking that
107 * inode is a quota file). Functions adding pointers from inode to dquots have
108 * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they
109 * have to do all pointer modifications before dropping dq_data_lock. This makes
110 * sure they cannot race with quotaon which first sets S_NOQUOTA flag and
111 * then drops all pointers to dquots from an inode.
113 * Each dquot has its dq_lock mutex. Dquot is locked when it is being read to
114 * memory (or space for it is being allocated) on the first dqget(), when it is
115 * being written out, and when it is being released on the last dqput(). The
116 * allocation and release operations are serialized by the dq_lock and by
117 * checking the use count in dquot_release().
119 * Lock ordering (including related VFS locks) is the following:
120 * s_umount > i_mutex > journal_lock > dquot->dq_lock > dqio_sem
123 static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock);
124 static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock);
125 __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock);
126 EXPORT_SYMBOL(dq_data_lock);
127 DEFINE_STATIC_SRCU(dquot_srcu);
129 static DECLARE_WAIT_QUEUE_HEAD(dquot_ref_wq);
131 void __quota_error(struct super_block *sb, const char *func,
132 const char *fmt, ...)
134 if (printk_ratelimit()) {
136 struct va_format vaf;
143 printk(KERN_ERR "Quota error (device %s): %s: %pV\n",
144 sb->s_id, func, &vaf);
149 EXPORT_SYMBOL(__quota_error);
151 #if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING)
152 static char *quotatypes[] = INITQFNAMES;
154 static struct quota_format_type *quota_formats; /* List of registered formats */
155 static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES;
157 /* SLAB cache for dquot structures */
158 static struct kmem_cache *dquot_cachep;
160 int register_quota_format(struct quota_format_type *fmt)
162 spin_lock(&dq_list_lock);
163 fmt->qf_next = quota_formats;
165 spin_unlock(&dq_list_lock);
168 EXPORT_SYMBOL(register_quota_format);
170 void unregister_quota_format(struct quota_format_type *fmt)
172 struct quota_format_type **actqf;
174 spin_lock(&dq_list_lock);
175 for (actqf = "a_formats; *actqf && *actqf != fmt;
176 actqf = &(*actqf)->qf_next)
179 *actqf = (*actqf)->qf_next;
180 spin_unlock(&dq_list_lock);
182 EXPORT_SYMBOL(unregister_quota_format);
184 static struct quota_format_type *find_quota_format(int id)
186 struct quota_format_type *actqf;
188 spin_lock(&dq_list_lock);
189 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id;
190 actqf = actqf->qf_next)
192 if (!actqf || !try_module_get(actqf->qf_owner)) {
195 spin_unlock(&dq_list_lock);
197 for (qm = 0; module_names[qm].qm_fmt_id &&
198 module_names[qm].qm_fmt_id != id; qm++)
200 if (!module_names[qm].qm_fmt_id ||
201 request_module(module_names[qm].qm_mod_name))
204 spin_lock(&dq_list_lock);
205 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id;
206 actqf = actqf->qf_next)
208 if (actqf && !try_module_get(actqf->qf_owner))
211 spin_unlock(&dq_list_lock);
215 static void put_quota_format(struct quota_format_type *fmt)
217 module_put(fmt->qf_owner);
221 * Dquot List Management:
222 * The quota code uses three lists for dquot management: the inuse_list,
223 * free_dquots, and dquot_hash[] array. A single dquot structure may be
224 * on all three lists, depending on its current state.
226 * All dquots are placed to the end of inuse_list when first created, and this
227 * list is used for invalidate operation, which must look at every dquot.
229 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
230 * and this list is searched whenever we need an available dquot. Dquots are
231 * removed from the list as soon as they are used again, and
232 * dqstats.free_dquots gives the number of dquots on the list. When
233 * dquot is invalidated it's completely released from memory.
235 * Dquots with a specific identity (device, type and id) are placed on
236 * one of the dquot_hash[] hash chains. The provides an efficient search
237 * mechanism to locate a specific dquot.
240 static LIST_HEAD(inuse_list);
241 static LIST_HEAD(free_dquots);
242 static unsigned int dq_hash_bits, dq_hash_mask;
243 static struct hlist_head *dquot_hash;
245 struct dqstats dqstats;
246 EXPORT_SYMBOL(dqstats);
248 static qsize_t inode_get_rsv_space(struct inode *inode);
249 static int __dquot_initialize(struct inode *inode, int type);
251 static inline unsigned int
252 hashfn(const struct super_block *sb, struct kqid qid)
254 unsigned int id = from_kqid(&init_user_ns, qid);
258 tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
259 return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
263 * Following list functions expect dq_list_lock to be held
265 static inline void insert_dquot_hash(struct dquot *dquot)
267 struct hlist_head *head;
268 head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id);
269 hlist_add_head(&dquot->dq_hash, head);
272 static inline void remove_dquot_hash(struct dquot *dquot)
274 hlist_del_init(&dquot->dq_hash);
277 static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb,
280 struct hlist_node *node;
283 hlist_for_each (node, dquot_hash+hashent) {
284 dquot = hlist_entry(node, struct dquot, dq_hash);
285 if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid))
291 /* Add a dquot to the tail of the free list */
292 static inline void put_dquot_last(struct dquot *dquot)
294 list_add_tail(&dquot->dq_free, &free_dquots);
295 dqstats_inc(DQST_FREE_DQUOTS);
298 static inline void remove_free_dquot(struct dquot *dquot)
300 if (list_empty(&dquot->dq_free))
302 list_del_init(&dquot->dq_free);
303 dqstats_dec(DQST_FREE_DQUOTS);
306 static inline void put_inuse(struct dquot *dquot)
308 /* We add to the back of inuse list so we don't have to restart
309 * when traversing this list and we block */
310 list_add_tail(&dquot->dq_inuse, &inuse_list);
311 dqstats_inc(DQST_ALLOC_DQUOTS);
314 static inline void remove_inuse(struct dquot *dquot)
316 dqstats_dec(DQST_ALLOC_DQUOTS);
317 list_del(&dquot->dq_inuse);
320 * End of list functions needing dq_list_lock
323 static void wait_on_dquot(struct dquot *dquot)
325 mutex_lock(&dquot->dq_lock);
326 mutex_unlock(&dquot->dq_lock);
329 static inline int dquot_dirty(struct dquot *dquot)
331 return test_bit(DQ_MOD_B, &dquot->dq_flags);
334 static inline int mark_dquot_dirty(struct dquot *dquot)
336 return dquot->dq_sb->dq_op->mark_dirty(dquot);
339 /* Mark dquot dirty in atomic manner, and return it's old dirty flag state */
340 int dquot_mark_dquot_dirty(struct dquot *dquot)
344 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
347 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY)
348 return test_and_set_bit(DQ_MOD_B, &dquot->dq_flags);
350 /* If quota is dirty already, we don't have to acquire dq_list_lock */
351 if (test_bit(DQ_MOD_B, &dquot->dq_flags))
354 spin_lock(&dq_list_lock);
355 if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) {
356 list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
357 info[dquot->dq_id.type].dqi_dirty_list);
360 spin_unlock(&dq_list_lock);
363 EXPORT_SYMBOL(dquot_mark_dquot_dirty);
365 /* Dirtify all the dquots - this can block when journalling */
366 static inline int mark_all_dquot_dirty(struct dquot * const *dquot)
371 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
373 /* Even in case of error we have to continue */
374 ret = mark_dquot_dirty(dquot[cnt]);
381 static inline void dqput_all(struct dquot **dquot)
385 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
389 static inline int clear_dquot_dirty(struct dquot *dquot)
391 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NOLIST_DIRTY)
392 return test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags);
394 spin_lock(&dq_list_lock);
395 if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags)) {
396 spin_unlock(&dq_list_lock);
399 list_del_init(&dquot->dq_dirty);
400 spin_unlock(&dq_list_lock);
404 void mark_info_dirty(struct super_block *sb, int type)
406 spin_lock(&dq_data_lock);
407 sb_dqopt(sb)->info[type].dqi_flags |= DQF_INFO_DIRTY;
408 spin_unlock(&dq_data_lock);
410 EXPORT_SYMBOL(mark_info_dirty);
413 * Read dquot from disk and alloc space for it
416 int dquot_acquire(struct dquot *dquot)
418 int ret = 0, ret2 = 0;
419 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
421 mutex_lock(&dquot->dq_lock);
422 if (!test_bit(DQ_READ_B, &dquot->dq_flags))
423 ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot);
426 /* Make sure flags update is visible after dquot has been filled */
427 smp_mb__before_atomic();
428 set_bit(DQ_READ_B, &dquot->dq_flags);
429 /* Instantiate dquot if needed */
430 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
431 ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot);
432 /* Write the info if needed */
433 if (info_dirty(&dqopt->info[dquot->dq_id.type])) {
434 ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info(
435 dquot->dq_sb, dquot->dq_id.type);
445 * Make sure flags update is visible after on-disk struct has been
446 * allocated. Paired with smp_rmb() in dqget().
448 smp_mb__before_atomic();
449 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
451 mutex_unlock(&dquot->dq_lock);
454 EXPORT_SYMBOL(dquot_acquire);
457 * Write dquot to disk
459 int dquot_commit(struct dquot *dquot)
462 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
464 mutex_lock(&dquot->dq_lock);
465 if (!clear_dquot_dirty(dquot))
467 /* Inactive dquot can be only if there was error during read/init
468 * => we have better not writing it */
469 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
470 ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot);
474 mutex_unlock(&dquot->dq_lock);
477 EXPORT_SYMBOL(dquot_commit);
482 int dquot_release(struct dquot *dquot)
484 int ret = 0, ret2 = 0;
485 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
487 mutex_lock(&dquot->dq_lock);
488 /* Check whether we are not racing with some other dqget() */
489 if (atomic_read(&dquot->dq_count) > 1)
491 if (dqopt->ops[dquot->dq_id.type]->release_dqblk) {
492 ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot);
494 if (info_dirty(&dqopt->info[dquot->dq_id.type])) {
495 ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info(
496 dquot->dq_sb, dquot->dq_id.type);
501 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
503 mutex_unlock(&dquot->dq_lock);
506 EXPORT_SYMBOL(dquot_release);
508 void dquot_destroy(struct dquot *dquot)
510 kmem_cache_free(dquot_cachep, dquot);
512 EXPORT_SYMBOL(dquot_destroy);
514 static inline void do_destroy_dquot(struct dquot *dquot)
516 dquot->dq_sb->dq_op->destroy_dquot(dquot);
519 /* Invalidate all dquots on the list. Note that this function is called after
520 * quota is disabled and pointers from inodes removed so there cannot be new
521 * quota users. There can still be some users of quotas due to inodes being
522 * just deleted or pruned by prune_icache() (those are not attached to any
523 * list) or parallel quotactl call. We have to wait for such users.
525 static void invalidate_dquots(struct super_block *sb, int type)
527 struct dquot *dquot, *tmp;
530 spin_lock(&dq_list_lock);
531 list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
532 if (dquot->dq_sb != sb)
534 if (dquot->dq_id.type != type)
536 /* Wait for dquot users */
537 if (atomic_read(&dquot->dq_count)) {
539 spin_unlock(&dq_list_lock);
541 * Once dqput() wakes us up, we know it's time to free
543 * IMPORTANT: we rely on the fact that there is always
544 * at most one process waiting for dquot to free.
545 * Otherwise dq_count would be > 1 and we would never
548 wait_event(dquot_ref_wq,
549 atomic_read(&dquot->dq_count) == 1);
551 /* At this moment dquot() need not exist (it could be
552 * reclaimed by prune_dqcache(). Hence we must
557 * Quota now has no users and it has been written on last
560 remove_dquot_hash(dquot);
561 remove_free_dquot(dquot);
563 do_destroy_dquot(dquot);
565 spin_unlock(&dq_list_lock);
568 /* Call callback for every active dquot on given filesystem */
569 int dquot_scan_active(struct super_block *sb,
570 int (*fn)(struct dquot *dquot, unsigned long priv),
573 struct dquot *dquot, *old_dquot = NULL;
576 WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount));
578 spin_lock(&dq_list_lock);
579 list_for_each_entry(dquot, &inuse_list, dq_inuse) {
580 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
582 if (dquot->dq_sb != sb)
584 /* Now we have active dquot so we can just increase use count */
585 atomic_inc(&dquot->dq_count);
586 spin_unlock(&dq_list_lock);
587 dqstats_inc(DQST_LOOKUPS);
591 * ->release_dquot() can be racing with us. Our reference
592 * protects us from new calls to it so just wait for any
593 * outstanding call and recheck the DQ_ACTIVE_B after that.
595 wait_on_dquot(dquot);
596 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
597 ret = fn(dquot, priv);
601 spin_lock(&dq_list_lock);
602 /* We are safe to continue now because our dquot could not
603 * be moved out of the inuse list while we hold the reference */
605 spin_unlock(&dq_list_lock);
610 EXPORT_SYMBOL(dquot_scan_active);
612 /* Write all dquot structures to quota files */
613 int dquot_writeback_dquots(struct super_block *sb, int type)
615 struct list_head *dirty;
617 struct quota_info *dqopt = sb_dqopt(sb);
621 WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount));
623 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
624 if (type != -1 && cnt != type)
626 if (!sb_has_quota_active(sb, cnt))
628 spin_lock(&dq_list_lock);
629 dirty = &dqopt->info[cnt].dqi_dirty_list;
630 while (!list_empty(dirty)) {
631 dquot = list_first_entry(dirty, struct dquot,
634 WARN_ON(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags));
636 /* Now we have active dquot from which someone is
637 * holding reference so we can safely just increase
640 spin_unlock(&dq_list_lock);
641 dqstats_inc(DQST_LOOKUPS);
642 err = sb->dq_op->write_dquot(dquot);
646 spin_lock(&dq_list_lock);
648 spin_unlock(&dq_list_lock);
651 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
652 if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt)
653 && info_dirty(&dqopt->info[cnt]))
654 sb->dq_op->write_info(sb, cnt);
655 dqstats_inc(DQST_SYNCS);
659 EXPORT_SYMBOL(dquot_writeback_dquots);
661 /* Write all dquot structures to disk and make them visible from userspace */
662 int dquot_quota_sync(struct super_block *sb, int type)
664 struct quota_info *dqopt = sb_dqopt(sb);
668 ret = dquot_writeback_dquots(sb, type);
671 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
674 /* This is not very clever (and fast) but currently I don't know about
675 * any other simple way of getting quota data to disk and we must get
676 * them there for userspace to be visible... */
677 if (sb->s_op->sync_fs)
678 sb->s_op->sync_fs(sb, 1);
679 sync_blockdev(sb->s_bdev);
682 * Now when everything is written we can discard the pagecache so
683 * that userspace sees the changes.
685 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
686 if (type != -1 && cnt != type)
688 if (!sb_has_quota_active(sb, cnt))
690 inode_lock(dqopt->files[cnt]);
691 truncate_inode_pages(&dqopt->files[cnt]->i_data, 0);
692 inode_unlock(dqopt->files[cnt]);
697 EXPORT_SYMBOL(dquot_quota_sync);
700 dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
702 struct list_head *head;
704 unsigned long freed = 0;
706 spin_lock(&dq_list_lock);
707 head = free_dquots.prev;
708 while (head != &free_dquots && sc->nr_to_scan) {
709 dquot = list_entry(head, struct dquot, dq_free);
710 remove_dquot_hash(dquot);
711 remove_free_dquot(dquot);
713 do_destroy_dquot(dquot);
716 head = free_dquots.prev;
718 spin_unlock(&dq_list_lock);
723 dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
725 return vfs_pressure_ratio(
726 percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS]));
729 static struct shrinker dqcache_shrinker = {
730 .count_objects = dqcache_shrink_count,
731 .scan_objects = dqcache_shrink_scan,
732 .seeks = DEFAULT_SEEKS,
736 * Put reference to dquot
738 void dqput(struct dquot *dquot)
744 #ifdef CONFIG_QUOTA_DEBUG
745 if (!atomic_read(&dquot->dq_count)) {
746 quota_error(dquot->dq_sb, "trying to free free dquot of %s %d",
747 quotatypes[dquot->dq_id.type],
748 from_kqid(&init_user_ns, dquot->dq_id));
752 dqstats_inc(DQST_DROPS);
754 spin_lock(&dq_list_lock);
755 if (atomic_read(&dquot->dq_count) > 1) {
756 /* We have more than one user... nothing to do */
757 atomic_dec(&dquot->dq_count);
758 /* Releasing dquot during quotaoff phase? */
759 if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) &&
760 atomic_read(&dquot->dq_count) == 1)
761 wake_up(&dquot_ref_wq);
762 spin_unlock(&dq_list_lock);
765 /* Need to release dquot? */
766 if (dquot_dirty(dquot)) {
767 spin_unlock(&dq_list_lock);
768 /* Commit dquot before releasing */
769 ret = dquot->dq_sb->dq_op->write_dquot(dquot);
771 quota_error(dquot->dq_sb, "Can't write quota structure"
772 " (error %d). Quota may get out of sync!",
775 * We clear dirty bit anyway, so that we avoid
778 clear_dquot_dirty(dquot);
782 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
783 spin_unlock(&dq_list_lock);
784 dquot->dq_sb->dq_op->release_dquot(dquot);
787 atomic_dec(&dquot->dq_count);
788 #ifdef CONFIG_QUOTA_DEBUG
790 BUG_ON(!list_empty(&dquot->dq_free));
792 put_dquot_last(dquot);
793 spin_unlock(&dq_list_lock);
795 EXPORT_SYMBOL(dqput);
797 struct dquot *dquot_alloc(struct super_block *sb, int type)
799 return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
801 EXPORT_SYMBOL(dquot_alloc);
803 static struct dquot *get_empty_dquot(struct super_block *sb, int type)
807 dquot = sb->dq_op->alloc_dquot(sb, type);
811 mutex_init(&dquot->dq_lock);
812 INIT_LIST_HEAD(&dquot->dq_free);
813 INIT_LIST_HEAD(&dquot->dq_inuse);
814 INIT_HLIST_NODE(&dquot->dq_hash);
815 INIT_LIST_HEAD(&dquot->dq_dirty);
817 dquot->dq_id = make_kqid_invalid(type);
818 atomic_set(&dquot->dq_count, 1);
824 * Get reference to dquot
826 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
827 * destroying our dquot by:
828 * a) checking for quota flags under dq_list_lock and
829 * b) getting a reference to dquot before we release dq_list_lock
831 struct dquot *dqget(struct super_block *sb, struct kqid qid)
833 unsigned int hashent = hashfn(sb, qid);
834 struct dquot *dquot, *empty = NULL;
836 if (!qid_has_mapping(sb->s_user_ns, qid))
837 return ERR_PTR(-EINVAL);
839 if (!sb_has_quota_active(sb, qid.type))
840 return ERR_PTR(-ESRCH);
842 spin_lock(&dq_list_lock);
843 spin_lock(&dq_state_lock);
844 if (!sb_has_quota_active(sb, qid.type)) {
845 spin_unlock(&dq_state_lock);
846 spin_unlock(&dq_list_lock);
847 dquot = ERR_PTR(-ESRCH);
850 spin_unlock(&dq_state_lock);
852 dquot = find_dquot(hashent, sb, qid);
855 spin_unlock(&dq_list_lock);
856 empty = get_empty_dquot(sb, qid.type);
858 schedule(); /* Try to wait for a moment... */
864 /* all dquots go on the inuse_list */
866 /* hash it first so it can be found */
867 insert_dquot_hash(dquot);
868 spin_unlock(&dq_list_lock);
869 dqstats_inc(DQST_LOOKUPS);
871 if (!atomic_read(&dquot->dq_count))
872 remove_free_dquot(dquot);
873 atomic_inc(&dquot->dq_count);
874 spin_unlock(&dq_list_lock);
875 dqstats_inc(DQST_CACHE_HITS);
876 dqstats_inc(DQST_LOOKUPS);
878 /* Wait for dq_lock - after this we know that either dquot_release() is
879 * already finished or it will be canceled due to dq_count > 1 test */
880 wait_on_dquot(dquot);
881 /* Read the dquot / allocate space in quota file */
882 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
885 err = sb->dq_op->acquire_dquot(dquot);
888 dquot = ERR_PTR(err);
893 * Make sure following reads see filled structure - paired with
894 * smp_mb__before_atomic() in dquot_acquire().
897 #ifdef CONFIG_QUOTA_DEBUG
898 BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
902 do_destroy_dquot(empty);
906 EXPORT_SYMBOL(dqget);
908 static inline struct dquot **i_dquot(struct inode *inode)
910 return inode->i_sb->s_op->get_dquots(inode);
913 static int dqinit_needed(struct inode *inode, int type)
915 struct dquot * const *dquots;
918 if (IS_NOQUOTA(inode))
921 dquots = i_dquot(inode);
923 return !dquots[type];
924 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
930 /* This routine is guarded by s_umount semaphore */
931 static void add_dquot_ref(struct super_block *sb, int type)
933 struct inode *inode, *old_inode = NULL;
934 #ifdef CONFIG_QUOTA_DEBUG
938 spin_lock(&sb->s_inode_list_lock);
939 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
940 spin_lock(&inode->i_lock);
941 if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
942 !atomic_read(&inode->i_writecount) ||
943 !dqinit_needed(inode, type)) {
944 spin_unlock(&inode->i_lock);
948 spin_unlock(&inode->i_lock);
949 spin_unlock(&sb->s_inode_list_lock);
951 #ifdef CONFIG_QUOTA_DEBUG
952 if (unlikely(inode_get_rsv_space(inode) > 0))
956 __dquot_initialize(inode, type);
959 * We hold a reference to 'inode' so it couldn't have been
960 * removed from s_inodes list while we dropped the
961 * s_inode_list_lock. We cannot iput the inode now as we can be
962 * holding the last reference and we cannot iput it under
963 * s_inode_list_lock. So we keep the reference and iput it
967 spin_lock(&sb->s_inode_list_lock);
969 spin_unlock(&sb->s_inode_list_lock);
972 #ifdef CONFIG_QUOTA_DEBUG
974 quota_error(sb, "Writes happened before quota was turned on "
975 "thus quota information is probably inconsistent. "
976 "Please run quotacheck(8)");
982 * Remove references to dquots from inode and add dquot to list for freeing
983 * if we have the last reference to dquot
985 static void remove_inode_dquot_ref(struct inode *inode, int type,
986 struct list_head *tofree_head)
988 struct dquot **dquots = i_dquot(inode);
989 struct dquot *dquot = dquots[type];
995 if (list_empty(&dquot->dq_free)) {
997 * The inode still has reference to dquot so it can't be in the
1000 spin_lock(&dq_list_lock);
1001 list_add(&dquot->dq_free, tofree_head);
1002 spin_unlock(&dq_list_lock);
1005 * Dquot is already in a list to put so we won't drop the last
1013 * Free list of dquots
1014 * Dquots are removed from inodes and no new references can be got so we are
1015 * the only ones holding reference
1017 static void put_dquot_list(struct list_head *tofree_head)
1019 struct list_head *act_head;
1020 struct dquot *dquot;
1022 act_head = tofree_head->next;
1023 while (act_head != tofree_head) {
1024 dquot = list_entry(act_head, struct dquot, dq_free);
1025 act_head = act_head->next;
1026 /* Remove dquot from the list so we won't have problems... */
1027 list_del_init(&dquot->dq_free);
1032 static void remove_dquot_ref(struct super_block *sb, int type,
1033 struct list_head *tofree_head)
1035 struct inode *inode;
1038 spin_lock(&sb->s_inode_list_lock);
1039 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
1041 * We have to scan also I_NEW inodes because they can already
1042 * have quota pointer initialized. Luckily, we need to touch
1043 * only quota pointers and these have separate locking
1046 spin_lock(&dq_data_lock);
1047 if (!IS_NOQUOTA(inode)) {
1048 if (unlikely(inode_get_rsv_space(inode) > 0))
1050 remove_inode_dquot_ref(inode, type, tofree_head);
1052 spin_unlock(&dq_data_lock);
1054 spin_unlock(&sb->s_inode_list_lock);
1055 #ifdef CONFIG_QUOTA_DEBUG
1057 printk(KERN_WARNING "VFS (%s): Writes happened after quota"
1058 " was disabled thus quota information is probably "
1059 "inconsistent. Please run quotacheck(8).\n", sb->s_id);
1064 /* Gather all references from inodes and drop them */
1065 static void drop_dquot_ref(struct super_block *sb, int type)
1067 LIST_HEAD(tofree_head);
1070 remove_dquot_ref(sb, type, &tofree_head);
1071 synchronize_srcu(&dquot_srcu);
1072 put_dquot_list(&tofree_head);
1076 static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
1078 dquot->dq_dqb.dqb_curinodes += number;
1081 static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
1083 dquot->dq_dqb.dqb_curspace += number;
1086 static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
1088 dquot->dq_dqb.dqb_rsvspace += number;
1092 * Claim reserved quota space
1094 static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number)
1096 if (dquot->dq_dqb.dqb_rsvspace < number) {
1098 number = dquot->dq_dqb.dqb_rsvspace;
1100 dquot->dq_dqb.dqb_curspace += number;
1101 dquot->dq_dqb.dqb_rsvspace -= number;
1104 static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number)
1106 if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number))
1107 number = dquot->dq_dqb.dqb_curspace;
1108 dquot->dq_dqb.dqb_rsvspace += number;
1109 dquot->dq_dqb.dqb_curspace -= number;
1113 void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
1115 if (dquot->dq_dqb.dqb_rsvspace >= number)
1116 dquot->dq_dqb.dqb_rsvspace -= number;
1119 dquot->dq_dqb.dqb_rsvspace = 0;
1123 static void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
1125 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
1126 dquot->dq_dqb.dqb_curinodes >= number)
1127 dquot->dq_dqb.dqb_curinodes -= number;
1129 dquot->dq_dqb.dqb_curinodes = 0;
1130 if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
1131 dquot->dq_dqb.dqb_itime = (time64_t) 0;
1132 clear_bit(DQ_INODES_B, &dquot->dq_flags);
1135 static void dquot_decr_space(struct dquot *dquot, qsize_t number)
1137 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
1138 dquot->dq_dqb.dqb_curspace >= number)
1139 dquot->dq_dqb.dqb_curspace -= number;
1141 dquot->dq_dqb.dqb_curspace = 0;
1142 if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
1143 dquot->dq_dqb.dqb_btime = (time64_t) 0;
1144 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
1148 struct super_block *w_sb;
1149 struct kqid w_dq_id;
1153 static int warning_issued(struct dquot *dquot, const int warntype)
1155 int flag = (warntype == QUOTA_NL_BHARDWARN ||
1156 warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
1157 ((warntype == QUOTA_NL_IHARDWARN ||
1158 warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
1162 return test_and_set_bit(flag, &dquot->dq_flags);
1165 #ifdef CONFIG_PRINT_QUOTA_WARNING
1166 static int flag_print_warnings = 1;
1168 static int need_print_warning(struct dquot_warn *warn)
1170 if (!flag_print_warnings)
1173 switch (warn->w_dq_id.type) {
1175 return uid_eq(current_fsuid(), warn->w_dq_id.uid);
1177 return in_group_p(warn->w_dq_id.gid);
1184 /* Print warning to user which exceeded quota */
1185 static void print_warning(struct dquot_warn *warn)
1188 struct tty_struct *tty;
1189 int warntype = warn->w_type;
1191 if (warntype == QUOTA_NL_IHARDBELOW ||
1192 warntype == QUOTA_NL_ISOFTBELOW ||
1193 warntype == QUOTA_NL_BHARDBELOW ||
1194 warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn))
1197 tty = get_current_tty();
1200 tty_write_message(tty, warn->w_sb->s_id);
1201 if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
1202 tty_write_message(tty, ": warning, ");
1204 tty_write_message(tty, ": write failed, ");
1205 tty_write_message(tty, quotatypes[warn->w_dq_id.type]);
1207 case QUOTA_NL_IHARDWARN:
1208 msg = " file limit reached.\r\n";
1210 case QUOTA_NL_ISOFTLONGWARN:
1211 msg = " file quota exceeded too long.\r\n";
1213 case QUOTA_NL_ISOFTWARN:
1214 msg = " file quota exceeded.\r\n";
1216 case QUOTA_NL_BHARDWARN:
1217 msg = " block limit reached.\r\n";
1219 case QUOTA_NL_BSOFTLONGWARN:
1220 msg = " block quota exceeded too long.\r\n";
1222 case QUOTA_NL_BSOFTWARN:
1223 msg = " block quota exceeded.\r\n";
1226 tty_write_message(tty, msg);
1231 static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot,
1234 if (warning_issued(dquot, warntype))
1236 warn->w_type = warntype;
1237 warn->w_sb = dquot->dq_sb;
1238 warn->w_dq_id = dquot->dq_id;
1242 * Write warnings to the console and send warning messages over netlink.
1244 * Note that this function can call into tty and networking code.
1246 static void flush_warnings(struct dquot_warn *warn)
1250 for (i = 0; i < MAXQUOTAS; i++) {
1251 if (warn[i].w_type == QUOTA_NL_NOWARN)
1253 #ifdef CONFIG_PRINT_QUOTA_WARNING
1254 print_warning(&warn[i]);
1256 quota_send_warning(warn[i].w_dq_id,
1257 warn[i].w_sb->s_dev, warn[i].w_type);
1261 static int ignore_hardlimit(struct dquot *dquot)
1263 struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type];
1265 return capable(CAP_SYS_RESOURCE) &&
1266 (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD ||
1267 !(info->dqi_flags & DQF_ROOT_SQUASH));
1270 /* needs dq_data_lock */
1271 static int check_idq(struct dquot *dquot, qsize_t inodes,
1272 struct dquot_warn *warn)
1274 qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes;
1276 if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) ||
1277 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1280 if (dquot->dq_dqb.dqb_ihardlimit &&
1281 newinodes > dquot->dq_dqb.dqb_ihardlimit &&
1282 !ignore_hardlimit(dquot)) {
1283 prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN);
1287 if (dquot->dq_dqb.dqb_isoftlimit &&
1288 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1289 dquot->dq_dqb.dqb_itime &&
1290 ktime_get_real_seconds() >= dquot->dq_dqb.dqb_itime &&
1291 !ignore_hardlimit(dquot)) {
1292 prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN);
1296 if (dquot->dq_dqb.dqb_isoftlimit &&
1297 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1298 dquot->dq_dqb.dqb_itime == 0) {
1299 prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN);
1300 dquot->dq_dqb.dqb_itime = ktime_get_real_seconds() +
1301 sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace;
1307 /* needs dq_data_lock */
1308 static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc,
1309 struct dquot_warn *warn)
1312 struct super_block *sb = dquot->dq_sb;
1314 if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) ||
1315 test_bit(DQ_FAKE_B, &dquot->dq_flags))
1318 tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace
1321 if (dquot->dq_dqb.dqb_bhardlimit &&
1322 tspace > dquot->dq_dqb.dqb_bhardlimit &&
1323 !ignore_hardlimit(dquot)) {
1325 prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN);
1329 if (dquot->dq_dqb.dqb_bsoftlimit &&
1330 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
1331 dquot->dq_dqb.dqb_btime &&
1332 ktime_get_real_seconds() >= dquot->dq_dqb.dqb_btime &&
1333 !ignore_hardlimit(dquot)) {
1335 prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN);
1339 if (dquot->dq_dqb.dqb_bsoftlimit &&
1340 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
1341 dquot->dq_dqb.dqb_btime == 0) {
1343 prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN);
1344 dquot->dq_dqb.dqb_btime = ktime_get_real_seconds() +
1345 sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace;
1349 * We don't allow preallocation to exceed softlimit so exceeding will
1358 static int info_idq_free(struct dquot *dquot, qsize_t inodes)
1362 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1363 dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit ||
1364 !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type))
1365 return QUOTA_NL_NOWARN;
1367 newinodes = dquot->dq_dqb.dqb_curinodes - inodes;
1368 if (newinodes <= dquot->dq_dqb.dqb_isoftlimit)
1369 return QUOTA_NL_ISOFTBELOW;
1370 if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
1371 newinodes < dquot->dq_dqb.dqb_ihardlimit)
1372 return QUOTA_NL_IHARDBELOW;
1373 return QUOTA_NL_NOWARN;
1376 static int info_bdq_free(struct dquot *dquot, qsize_t space)
1378 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1379 dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
1380 return QUOTA_NL_NOWARN;
1382 if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit)
1383 return QUOTA_NL_BSOFTBELOW;
1384 if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit &&
1385 dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit)
1386 return QUOTA_NL_BHARDBELOW;
1387 return QUOTA_NL_NOWARN;
1390 static int dquot_active(const struct inode *inode)
1392 struct super_block *sb = inode->i_sb;
1394 if (IS_NOQUOTA(inode))
1396 return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb);
1400 * Initialize quota pointers in inode
1402 * It is better to call this function outside of any transaction as it
1403 * might need a lot of space in journal for dquot structure allocation.
1405 static int __dquot_initialize(struct inode *inode, int type)
1407 int cnt, init_needed = 0;
1408 struct dquot **dquots, *got[MAXQUOTAS] = {};
1409 struct super_block *sb = inode->i_sb;
1413 if (!dquot_active(inode))
1416 dquots = i_dquot(inode);
1418 /* First get references to structures we might need. */
1419 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1423 struct dquot *dquot;
1425 if (type != -1 && cnt != type)
1428 * The i_dquot should have been initialized in most cases,
1429 * we check it without locking here to avoid unnecessary
1430 * dqget()/dqput() calls.
1435 if (!sb_has_quota_active(sb, cnt))
1442 qid = make_kqid_uid(inode->i_uid);
1445 qid = make_kqid_gid(inode->i_gid);
1448 rc = inode->i_sb->dq_op->get_projid(inode, &projid);
1451 qid = make_kqid_projid(projid);
1454 dquot = dqget(sb, qid);
1455 if (IS_ERR(dquot)) {
1456 /* We raced with somebody turning quotas off... */
1457 if (PTR_ERR(dquot) != -ESRCH) {
1458 ret = PTR_ERR(dquot);
1466 /* All required i_dquot has been initialized */
1470 spin_lock(&dq_data_lock);
1471 if (IS_NOQUOTA(inode))
1473 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1474 if (type != -1 && cnt != type)
1476 /* Avoid races with quotaoff() */
1477 if (!sb_has_quota_active(sb, cnt))
1479 /* We could race with quotaon or dqget() could have failed */
1483 dquots[cnt] = got[cnt];
1486 * Make quota reservation system happy if someone
1487 * did a write before quota was turned on
1489 rsv = inode_get_rsv_space(inode);
1491 dquot_resv_space(dquots[cnt], rsv);
1495 spin_unlock(&dq_data_lock);
1497 /* Drop unused references */
1503 int dquot_initialize(struct inode *inode)
1505 return __dquot_initialize(inode, -1);
1507 EXPORT_SYMBOL(dquot_initialize);
1509 bool dquot_initialize_needed(struct inode *inode)
1511 struct dquot **dquots;
1514 if (!dquot_active(inode))
1517 dquots = i_dquot(inode);
1518 for (i = 0; i < MAXQUOTAS; i++)
1519 if (!dquots[i] && sb_has_quota_active(inode->i_sb, i))
1523 EXPORT_SYMBOL(dquot_initialize_needed);
1526 * Release all quotas referenced by inode.
1528 * This function only be called on inode free or converting
1529 * a file to quota file, no other users for the i_dquot in
1530 * both cases, so we needn't call synchronize_srcu() after
1533 static void __dquot_drop(struct inode *inode)
1536 struct dquot **dquots = i_dquot(inode);
1537 struct dquot *put[MAXQUOTAS];
1539 spin_lock(&dq_data_lock);
1540 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1541 put[cnt] = dquots[cnt];
1544 spin_unlock(&dq_data_lock);
1548 void dquot_drop(struct inode *inode)
1550 struct dquot * const *dquots;
1553 if (IS_NOQUOTA(inode))
1557 * Test before calling to rule out calls from proc and such
1558 * where we are not allowed to block. Note that this is
1559 * actually reliable test even without the lock - the caller
1560 * must assure that nobody can come after the DQUOT_DROP and
1561 * add quota pointers back anyway.
1563 dquots = i_dquot(inode);
1564 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1569 if (cnt < MAXQUOTAS)
1570 __dquot_drop(inode);
1572 EXPORT_SYMBOL(dquot_drop);
1575 * inode_reserved_space is managed internally by quota, and protected by
1576 * i_lock similar to i_blocks+i_bytes.
1578 static qsize_t *inode_reserved_space(struct inode * inode)
1580 /* Filesystem must explicitly define it's own method in order to use
1581 * quota reservation interface */
1582 BUG_ON(!inode->i_sb->dq_op->get_reserved_space);
1583 return inode->i_sb->dq_op->get_reserved_space(inode);
1586 void inode_add_rsv_space(struct inode *inode, qsize_t number)
1588 spin_lock(&inode->i_lock);
1589 *inode_reserved_space(inode) += number;
1590 spin_unlock(&inode->i_lock);
1592 EXPORT_SYMBOL(inode_add_rsv_space);
1594 void inode_claim_rsv_space(struct inode *inode, qsize_t number)
1596 spin_lock(&inode->i_lock);
1597 *inode_reserved_space(inode) -= number;
1598 __inode_add_bytes(inode, number);
1599 spin_unlock(&inode->i_lock);
1601 EXPORT_SYMBOL(inode_claim_rsv_space);
1603 void inode_reclaim_rsv_space(struct inode *inode, qsize_t number)
1605 spin_lock(&inode->i_lock);
1606 *inode_reserved_space(inode) += number;
1607 __inode_sub_bytes(inode, number);
1608 spin_unlock(&inode->i_lock);
1610 EXPORT_SYMBOL(inode_reclaim_rsv_space);
1612 void inode_sub_rsv_space(struct inode *inode, qsize_t number)
1614 spin_lock(&inode->i_lock);
1615 *inode_reserved_space(inode) -= number;
1616 spin_unlock(&inode->i_lock);
1618 EXPORT_SYMBOL(inode_sub_rsv_space);
1620 static qsize_t inode_get_rsv_space(struct inode *inode)
1624 if (!inode->i_sb->dq_op->get_reserved_space)
1626 spin_lock(&inode->i_lock);
1627 ret = *inode_reserved_space(inode);
1628 spin_unlock(&inode->i_lock);
1632 static void inode_incr_space(struct inode *inode, qsize_t number,
1636 inode_add_rsv_space(inode, number);
1638 inode_add_bytes(inode, number);
1641 static void inode_decr_space(struct inode *inode, qsize_t number, int reserve)
1644 inode_sub_rsv_space(inode, number);
1646 inode_sub_bytes(inode, number);
1650 * This functions updates i_blocks+i_bytes fields and quota information
1651 * (together with appropriate checks).
1653 * NOTE: We absolutely rely on the fact that caller dirties the inode
1654 * (usually helpers in quotaops.h care about this) and holds a handle for
1655 * the current transaction so that dquot write and inode write go into the
1660 * This operation can block, but only after everything is updated
1662 int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags)
1664 int cnt, ret = 0, index;
1665 struct dquot_warn warn[MAXQUOTAS];
1666 int reserve = flags & DQUOT_SPACE_RESERVE;
1667 struct dquot **dquots;
1669 if (!dquot_active(inode)) {
1670 inode_incr_space(inode, number, reserve);
1674 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1675 warn[cnt].w_type = QUOTA_NL_NOWARN;
1677 dquots = i_dquot(inode);
1678 index = srcu_read_lock(&dquot_srcu);
1679 spin_lock(&dq_data_lock);
1680 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1683 ret = check_bdq(dquots[cnt], number,
1684 !(flags & DQUOT_SPACE_WARN), &warn[cnt]);
1685 if (ret && !(flags & DQUOT_SPACE_NOFAIL)) {
1686 spin_unlock(&dq_data_lock);
1687 goto out_flush_warn;
1690 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1694 dquot_resv_space(dquots[cnt], number);
1696 dquot_incr_space(dquots[cnt], number);
1698 inode_incr_space(inode, number, reserve);
1699 spin_unlock(&dq_data_lock);
1702 goto out_flush_warn;
1703 mark_all_dquot_dirty(dquots);
1705 srcu_read_unlock(&dquot_srcu, index);
1706 flush_warnings(warn);
1710 EXPORT_SYMBOL(__dquot_alloc_space);
1713 * This operation can block, but only after everything is updated
1715 int dquot_alloc_inode(struct inode *inode)
1717 int cnt, ret = 0, index;
1718 struct dquot_warn warn[MAXQUOTAS];
1719 struct dquot * const *dquots;
1721 if (!dquot_active(inode))
1723 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1724 warn[cnt].w_type = QUOTA_NL_NOWARN;
1726 dquots = i_dquot(inode);
1727 index = srcu_read_lock(&dquot_srcu);
1728 spin_lock(&dq_data_lock);
1729 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1732 ret = check_idq(dquots[cnt], 1, &warn[cnt]);
1737 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1740 dquot_incr_inodes(dquots[cnt], 1);
1744 spin_unlock(&dq_data_lock);
1746 mark_all_dquot_dirty(dquots);
1747 srcu_read_unlock(&dquot_srcu, index);
1748 flush_warnings(warn);
1751 EXPORT_SYMBOL(dquot_alloc_inode);
1754 * Convert in-memory reserved quotas to real consumed quotas
1756 int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
1758 struct dquot **dquots;
1761 if (!dquot_active(inode)) {
1762 inode_claim_rsv_space(inode, number);
1766 dquots = i_dquot(inode);
1767 index = srcu_read_lock(&dquot_srcu);
1768 spin_lock(&dq_data_lock);
1769 /* Claim reserved quotas to allocated quotas */
1770 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1772 dquot_claim_reserved_space(dquots[cnt], number);
1774 /* Update inode bytes */
1775 inode_claim_rsv_space(inode, number);
1776 spin_unlock(&dq_data_lock);
1777 mark_all_dquot_dirty(dquots);
1778 srcu_read_unlock(&dquot_srcu, index);
1781 EXPORT_SYMBOL(dquot_claim_space_nodirty);
1784 * Convert allocated space back to in-memory reserved quotas
1786 void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number)
1788 struct dquot **dquots;
1791 if (!dquot_active(inode)) {
1792 inode_reclaim_rsv_space(inode, number);
1796 dquots = i_dquot(inode);
1797 index = srcu_read_lock(&dquot_srcu);
1798 spin_lock(&dq_data_lock);
1799 /* Claim reserved quotas to allocated quotas */
1800 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1802 dquot_reclaim_reserved_space(dquots[cnt], number);
1804 /* Update inode bytes */
1805 inode_reclaim_rsv_space(inode, number);
1806 spin_unlock(&dq_data_lock);
1807 mark_all_dquot_dirty(dquots);
1808 srcu_read_unlock(&dquot_srcu, index);
1811 EXPORT_SYMBOL(dquot_reclaim_space_nodirty);
1814 * This operation can block, but only after everything is updated
1816 void __dquot_free_space(struct inode *inode, qsize_t number, int flags)
1819 struct dquot_warn warn[MAXQUOTAS];
1820 struct dquot **dquots;
1821 int reserve = flags & DQUOT_SPACE_RESERVE, index;
1823 if (!dquot_active(inode)) {
1824 inode_decr_space(inode, number, reserve);
1828 dquots = i_dquot(inode);
1829 index = srcu_read_lock(&dquot_srcu);
1830 spin_lock(&dq_data_lock);
1831 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1834 warn[cnt].w_type = QUOTA_NL_NOWARN;
1837 wtype = info_bdq_free(dquots[cnt], number);
1838 if (wtype != QUOTA_NL_NOWARN)
1839 prepare_warning(&warn[cnt], dquots[cnt], wtype);
1841 dquot_free_reserved_space(dquots[cnt], number);
1843 dquot_decr_space(dquots[cnt], number);
1845 inode_decr_space(inode, number, reserve);
1846 spin_unlock(&dq_data_lock);
1850 mark_all_dquot_dirty(dquots);
1852 srcu_read_unlock(&dquot_srcu, index);
1853 flush_warnings(warn);
1855 EXPORT_SYMBOL(__dquot_free_space);
1858 * This operation can block, but only after everything is updated
1860 void dquot_free_inode(struct inode *inode)
1863 struct dquot_warn warn[MAXQUOTAS];
1864 struct dquot * const *dquots;
1867 if (!dquot_active(inode))
1870 dquots = i_dquot(inode);
1871 index = srcu_read_lock(&dquot_srcu);
1872 spin_lock(&dq_data_lock);
1873 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1876 warn[cnt].w_type = QUOTA_NL_NOWARN;
1879 wtype = info_idq_free(dquots[cnt], 1);
1880 if (wtype != QUOTA_NL_NOWARN)
1881 prepare_warning(&warn[cnt], dquots[cnt], wtype);
1882 dquot_decr_inodes(dquots[cnt], 1);
1884 spin_unlock(&dq_data_lock);
1885 mark_all_dquot_dirty(dquots);
1886 srcu_read_unlock(&dquot_srcu, index);
1887 flush_warnings(warn);
1889 EXPORT_SYMBOL(dquot_free_inode);
1892 * Transfer the number of inode and blocks from one diskquota to an other.
1893 * On success, dquot references in transfer_to are consumed and references
1894 * to original dquots that need to be released are placed there. On failure,
1895 * references are kept untouched.
1897 * This operation can block, but only after everything is updated
1898 * A transaction must be started when entering this function.
1900 * We are holding reference on transfer_from & transfer_to, no need to
1901 * protect them by srcu_read_lock().
1903 int __dquot_transfer(struct inode *inode, struct dquot **transfer_to)
1905 qsize_t space, cur_space;
1906 qsize_t rsv_space = 0;
1907 qsize_t inode_usage = 1;
1908 struct dquot *transfer_from[MAXQUOTAS] = {};
1910 char is_valid[MAXQUOTAS] = {};
1911 struct dquot_warn warn_to[MAXQUOTAS];
1912 struct dquot_warn warn_from_inodes[MAXQUOTAS];
1913 struct dquot_warn warn_from_space[MAXQUOTAS];
1915 if (IS_NOQUOTA(inode))
1918 if (inode->i_sb->dq_op->get_inode_usage) {
1919 ret = inode->i_sb->dq_op->get_inode_usage(inode, &inode_usage);
1924 /* Initialize the arrays */
1925 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1926 warn_to[cnt].w_type = QUOTA_NL_NOWARN;
1927 warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN;
1928 warn_from_space[cnt].w_type = QUOTA_NL_NOWARN;
1931 spin_lock(&dq_data_lock);
1932 if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
1933 spin_unlock(&dq_data_lock);
1936 cur_space = inode_get_bytes(inode);
1937 rsv_space = inode_get_rsv_space(inode);
1938 space = cur_space + rsv_space;
1939 /* Build the transfer_from list and check the limits */
1940 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1942 * Skip changes for same uid or gid or for turned off quota-type.
1944 if (!transfer_to[cnt])
1946 /* Avoid races with quotaoff() */
1947 if (!sb_has_quota_active(inode->i_sb, cnt))
1950 transfer_from[cnt] = i_dquot(inode)[cnt];
1951 ret = check_idq(transfer_to[cnt], inode_usage, &warn_to[cnt]);
1954 ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]);
1960 * Finally perform the needed transfer from transfer_from to transfer_to
1962 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1965 /* Due to IO error we might not have transfer_from[] structure */
1966 if (transfer_from[cnt]) {
1968 wtype = info_idq_free(transfer_from[cnt], inode_usage);
1969 if (wtype != QUOTA_NL_NOWARN)
1970 prepare_warning(&warn_from_inodes[cnt],
1971 transfer_from[cnt], wtype);
1972 wtype = info_bdq_free(transfer_from[cnt], space);
1973 if (wtype != QUOTA_NL_NOWARN)
1974 prepare_warning(&warn_from_space[cnt],
1975 transfer_from[cnt], wtype);
1976 dquot_decr_inodes(transfer_from[cnt], inode_usage);
1977 dquot_decr_space(transfer_from[cnt], cur_space);
1978 dquot_free_reserved_space(transfer_from[cnt],
1982 dquot_incr_inodes(transfer_to[cnt], inode_usage);
1983 dquot_incr_space(transfer_to[cnt], cur_space);
1984 dquot_resv_space(transfer_to[cnt], rsv_space);
1986 i_dquot(inode)[cnt] = transfer_to[cnt];
1988 spin_unlock(&dq_data_lock);
1990 mark_all_dquot_dirty(transfer_from);
1991 mark_all_dquot_dirty(transfer_to);
1992 flush_warnings(warn_to);
1993 flush_warnings(warn_from_inodes);
1994 flush_warnings(warn_from_space);
1995 /* Pass back references to put */
1996 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1998 transfer_to[cnt] = transfer_from[cnt];
2001 spin_unlock(&dq_data_lock);
2002 flush_warnings(warn_to);
2005 EXPORT_SYMBOL(__dquot_transfer);
2007 /* Wrapper for transferring ownership of an inode for uid/gid only
2008 * Called from FSXXX_setattr()
2010 int dquot_transfer(struct inode *inode, struct iattr *iattr)
2012 struct dquot *transfer_to[MAXQUOTAS] = {};
2013 struct dquot *dquot;
2014 struct super_block *sb = inode->i_sb;
2017 if (!dquot_active(inode))
2020 if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)){
2021 dquot = dqget(sb, make_kqid_uid(iattr->ia_uid));
2022 if (IS_ERR(dquot)) {
2023 if (PTR_ERR(dquot) != -ESRCH) {
2024 ret = PTR_ERR(dquot);
2029 transfer_to[USRQUOTA] = dquot;
2031 if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid)){
2032 dquot = dqget(sb, make_kqid_gid(iattr->ia_gid));
2033 if (IS_ERR(dquot)) {
2034 if (PTR_ERR(dquot) != -ESRCH) {
2035 ret = PTR_ERR(dquot);
2040 transfer_to[GRPQUOTA] = dquot;
2042 ret = __dquot_transfer(inode, transfer_to);
2044 dqput_all(transfer_to);
2047 EXPORT_SYMBOL(dquot_transfer);
2050 * Write info of quota file to disk
2052 int dquot_commit_info(struct super_block *sb, int type)
2054 struct quota_info *dqopt = sb_dqopt(sb);
2056 return dqopt->ops[type]->write_file_info(sb, type);
2058 EXPORT_SYMBOL(dquot_commit_info);
2060 int dquot_get_next_id(struct super_block *sb, struct kqid *qid)
2062 struct quota_info *dqopt = sb_dqopt(sb);
2064 if (!sb_has_quota_active(sb, qid->type))
2066 if (!dqopt->ops[qid->type]->get_next_id)
2068 return dqopt->ops[qid->type]->get_next_id(sb, qid);
2070 EXPORT_SYMBOL(dquot_get_next_id);
2073 * Definitions of diskquota operations.
2075 const struct dquot_operations dquot_operations = {
2076 .write_dquot = dquot_commit,
2077 .acquire_dquot = dquot_acquire,
2078 .release_dquot = dquot_release,
2079 .mark_dirty = dquot_mark_dquot_dirty,
2080 .write_info = dquot_commit_info,
2081 .alloc_dquot = dquot_alloc,
2082 .destroy_dquot = dquot_destroy,
2083 .get_next_id = dquot_get_next_id,
2085 EXPORT_SYMBOL(dquot_operations);
2088 * Generic helper for ->open on filesystems supporting disk quotas.
2090 int dquot_file_open(struct inode *inode, struct file *file)
2094 error = generic_file_open(inode, file);
2095 if (!error && (file->f_mode & FMODE_WRITE))
2096 dquot_initialize(inode);
2099 EXPORT_SYMBOL(dquot_file_open);
2102 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
2104 int dquot_disable(struct super_block *sb, int type, unsigned int flags)
2107 struct quota_info *dqopt = sb_dqopt(sb);
2108 struct inode *toputinode[MAXQUOTAS];
2110 /* s_umount should be held in exclusive mode */
2111 if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount)))
2112 up_read(&sb->s_umount);
2114 /* Cannot turn off usage accounting without turning off limits, or
2115 * suspend quotas and simultaneously turn quotas off. */
2116 if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED))
2117 || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED |
2118 DQUOT_USAGE_ENABLED)))
2122 * Skip everything if there's nothing to do. We have to do this because
2123 * sometimes we are called when fill_super() failed and calling
2124 * sync_fs() in such cases does no good.
2126 if (!sb_any_quota_loaded(sb))
2129 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
2130 toputinode[cnt] = NULL;
2131 if (type != -1 && cnt != type)
2133 if (!sb_has_quota_loaded(sb, cnt))
2136 if (flags & DQUOT_SUSPENDED) {
2137 spin_lock(&dq_state_lock);
2139 dquot_state_flag(DQUOT_SUSPENDED, cnt);
2140 spin_unlock(&dq_state_lock);
2142 spin_lock(&dq_state_lock);
2143 dqopt->flags &= ~dquot_state_flag(flags, cnt);
2144 /* Turning off suspended quotas? */
2145 if (!sb_has_quota_loaded(sb, cnt) &&
2146 sb_has_quota_suspended(sb, cnt)) {
2147 dqopt->flags &= ~dquot_state_flag(
2148 DQUOT_SUSPENDED, cnt);
2149 spin_unlock(&dq_state_lock);
2150 iput(dqopt->files[cnt]);
2151 dqopt->files[cnt] = NULL;
2154 spin_unlock(&dq_state_lock);
2157 /* We still have to keep quota loaded? */
2158 if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED))
2161 /* Note: these are blocking operations */
2162 drop_dquot_ref(sb, cnt);
2163 invalidate_dquots(sb, cnt);
2165 * Now all dquots should be invalidated, all writes done so we
2166 * should be only users of the info. No locks needed.
2168 if (info_dirty(&dqopt->info[cnt]))
2169 sb->dq_op->write_info(sb, cnt);
2170 if (dqopt->ops[cnt]->free_file_info)
2171 dqopt->ops[cnt]->free_file_info(sb, cnt);
2172 put_quota_format(dqopt->info[cnt].dqi_format);
2174 toputinode[cnt] = dqopt->files[cnt];
2175 if (!sb_has_quota_loaded(sb, cnt))
2176 dqopt->files[cnt] = NULL;
2177 dqopt->info[cnt].dqi_flags = 0;
2178 dqopt->info[cnt].dqi_igrace = 0;
2179 dqopt->info[cnt].dqi_bgrace = 0;
2180 dqopt->ops[cnt] = NULL;
2183 /* Skip syncing and setting flags if quota files are hidden */
2184 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
2187 /* Sync the superblock so that buffers with quota data are written to
2188 * disk (and so userspace sees correct data afterwards). */
2189 if (sb->s_op->sync_fs)
2190 sb->s_op->sync_fs(sb, 1);
2191 sync_blockdev(sb->s_bdev);
2192 /* Now the quota files are just ordinary files and we can set the
2193 * inode flags back. Moreover we discard the pagecache so that
2194 * userspace sees the writes we did bypassing the pagecache. We
2195 * must also discard the blockdev buffers so that we see the
2196 * changes done by userspace on the next quotaon() */
2197 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
2198 /* This can happen when suspending quotas on remount-ro... */
2199 if (toputinode[cnt] && !sb_has_quota_loaded(sb, cnt)) {
2200 inode_lock(toputinode[cnt]);
2201 toputinode[cnt]->i_flags &= ~S_NOQUOTA;
2202 truncate_inode_pages(&toputinode[cnt]->i_data, 0);
2203 inode_unlock(toputinode[cnt]);
2204 mark_inode_dirty_sync(toputinode[cnt]);
2207 invalidate_bdev(sb->s_bdev);
2209 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
2210 if (toputinode[cnt]) {
2211 /* On remount RO, we keep the inode pointer so that we
2212 * can reenable quota on the subsequent remount RW. We
2213 * have to check 'flags' variable and not use sb_has_
2214 * function because another quotaon / quotaoff could
2215 * change global state before we got here. We refuse
2216 * to suspend quotas when there is pending delete on
2217 * the quota file... */
2218 if (!(flags & DQUOT_SUSPENDED))
2219 iput(toputinode[cnt]);
2220 else if (!toputinode[cnt]->i_nlink)
2225 EXPORT_SYMBOL(dquot_disable);
2227 int dquot_quota_off(struct super_block *sb, int type)
2229 return dquot_disable(sb, type,
2230 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
2232 EXPORT_SYMBOL(dquot_quota_off);
2235 * Turn quotas on on a device
2239 * Helper function to turn quotas on when we already have the inode of
2240 * quota file and no quota information is loaded.
2242 static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
2245 struct quota_format_type *fmt = find_quota_format(format_id);
2246 struct super_block *sb = inode->i_sb;
2247 struct quota_info *dqopt = sb_dqopt(sb);
2252 if (!S_ISREG(inode->i_mode)) {
2256 if (IS_RDONLY(inode)) {
2260 if (!sb->s_op->quota_write || !sb->s_op->quota_read ||
2261 (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) {
2265 /* Filesystems outside of init_user_ns not yet supported */
2266 if (sb->s_user_ns != &init_user_ns) {
2270 /* Usage always has to be set... */
2271 if (!(flags & DQUOT_USAGE_ENABLED)) {
2275 if (sb_has_quota_loaded(sb, type)) {
2280 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2281 /* As we bypass the pagecache we must now flush all the
2282 * dirty data and invalidate caches so that kernel sees
2283 * changes from userspace. It is not enough to just flush
2284 * the quota file since if blocksize < pagesize, invalidation
2285 * of the cache could fail because of other unrelated dirty
2287 sync_filesystem(sb);
2288 invalidate_bdev(sb->s_bdev);
2291 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2292 /* We don't want quota and atime on quota files (deadlocks
2293 * possible) Also nobody should write to the file - we use
2294 * special IO operations which ignore the immutable bit. */
2296 inode->i_flags |= S_NOQUOTA;
2297 inode_unlock(inode);
2299 * When S_NOQUOTA is set, remove dquot references as no more
2300 * references can be added
2302 __dquot_drop(inode);
2306 dqopt->files[type] = igrab(inode);
2307 if (!dqopt->files[type])
2308 goto out_file_flags;
2310 if (!fmt->qf_ops->check_quota_file(sb, type))
2313 dqopt->ops[type] = fmt->qf_ops;
2314 dqopt->info[type].dqi_format = fmt;
2315 dqopt->info[type].dqi_fmt_id = format_id;
2316 INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
2317 error = dqopt->ops[type]->read_file_info(sb, type);
2320 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) {
2321 spin_lock(&dq_data_lock);
2322 dqopt->info[type].dqi_flags |= DQF_SYS_FILE;
2323 spin_unlock(&dq_data_lock);
2325 spin_lock(&dq_state_lock);
2326 dqopt->flags |= dquot_state_flag(flags, type);
2327 spin_unlock(&dq_state_lock);
2329 add_dquot_ref(sb, type);
2334 dqopt->files[type] = NULL;
2338 inode->i_flags &= ~S_NOQUOTA;
2339 inode_unlock(inode);
2341 put_quota_format(fmt);
2346 /* Reenable quotas on remount RW */
2347 int dquot_resume(struct super_block *sb, int type)
2349 struct quota_info *dqopt = sb_dqopt(sb);
2350 struct inode *inode;
2354 /* s_umount should be held in exclusive mode */
2355 if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount)))
2356 up_read(&sb->s_umount);
2358 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
2359 if (type != -1 && cnt != type)
2361 if (!sb_has_quota_suspended(sb, cnt))
2364 inode = dqopt->files[cnt];
2365 dqopt->files[cnt] = NULL;
2366 spin_lock(&dq_state_lock);
2367 flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
2368 DQUOT_LIMITS_ENABLED,
2370 dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt);
2371 spin_unlock(&dq_state_lock);
2373 flags = dquot_generic_flag(flags, cnt);
2374 ret = vfs_load_quota_inode(inode, cnt,
2375 dqopt->info[cnt].dqi_fmt_id, flags);
2381 EXPORT_SYMBOL(dquot_resume);
2383 int dquot_quota_on(struct super_block *sb, int type, int format_id,
2384 const struct path *path)
2386 int error = security_quota_on(path->dentry);
2389 /* Quota file not on the same filesystem? */
2390 if (path->dentry->d_sb != sb)
2393 error = vfs_load_quota_inode(d_inode(path->dentry), type,
2394 format_id, DQUOT_USAGE_ENABLED |
2395 DQUOT_LIMITS_ENABLED);
2398 EXPORT_SYMBOL(dquot_quota_on);
2401 * More powerful function for turning on quotas allowing setting
2402 * of individual quota flags
2404 int dquot_enable(struct inode *inode, int type, int format_id,
2407 struct super_block *sb = inode->i_sb;
2409 /* Just unsuspend quotas? */
2410 BUG_ON(flags & DQUOT_SUSPENDED);
2411 /* s_umount should be held in exclusive mode */
2412 if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount)))
2413 up_read(&sb->s_umount);
2417 /* Just updating flags needed? */
2418 if (sb_has_quota_loaded(sb, type)) {
2419 if (flags & DQUOT_USAGE_ENABLED &&
2420 sb_has_quota_usage_enabled(sb, type))
2422 if (flags & DQUOT_LIMITS_ENABLED &&
2423 sb_has_quota_limits_enabled(sb, type))
2425 spin_lock(&dq_state_lock);
2426 sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
2427 spin_unlock(&dq_state_lock);
2431 return vfs_load_quota_inode(inode, type, format_id, flags);
2433 EXPORT_SYMBOL(dquot_enable);
2436 * This function is used when filesystem needs to initialize quotas
2437 * during mount time.
2439 int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
2440 int format_id, int type)
2442 struct dentry *dentry;
2445 dentry = lookup_one_len_unlocked(qf_name, sb->s_root, strlen(qf_name));
2447 return PTR_ERR(dentry);
2449 if (d_really_is_negative(dentry)) {
2454 error = security_quota_on(dentry);
2456 error = vfs_load_quota_inode(d_inode(dentry), type, format_id,
2457 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
2463 EXPORT_SYMBOL(dquot_quota_on_mount);
2465 static int dquot_quota_enable(struct super_block *sb, unsigned int flags)
2469 struct quota_info *dqopt = sb_dqopt(sb);
2471 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE))
2473 /* Accounting cannot be turned on while fs is mounted */
2474 flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT);
2477 for (type = 0; type < MAXQUOTAS; type++) {
2478 if (!(flags & qtype_enforce_flag(type)))
2480 /* Can't enforce without accounting */
2481 if (!sb_has_quota_usage_enabled(sb, type))
2483 ret = dquot_enable(dqopt->files[type], type,
2484 dqopt->info[type].dqi_fmt_id,
2485 DQUOT_LIMITS_ENABLED);
2491 /* Backout enforcement enablement we already did */
2492 for (type--; type >= 0; type--) {
2493 if (flags & qtype_enforce_flag(type))
2494 dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
2496 /* Error code translation for better compatibility with XFS */
2502 static int dquot_quota_disable(struct super_block *sb, unsigned int flags)
2506 struct quota_info *dqopt = sb_dqopt(sb);
2508 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE))
2511 * We don't support turning off accounting via quotactl. In principle
2512 * quota infrastructure can do this but filesystems don't expect
2513 * userspace to be able to do it.
2516 (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT))
2519 /* Filter out limits not enabled */
2520 for (type = 0; type < MAXQUOTAS; type++)
2521 if (!sb_has_quota_limits_enabled(sb, type))
2522 flags &= ~qtype_enforce_flag(type);
2526 for (type = 0; type < MAXQUOTAS; type++) {
2527 if (flags & qtype_enforce_flag(type)) {
2528 ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
2535 /* Backout enforcement disabling we already did */
2536 for (type--; type >= 0; type--) {
2537 if (flags & qtype_enforce_flag(type))
2538 dquot_enable(dqopt->files[type], type,
2539 dqopt->info[type].dqi_fmt_id,
2540 DQUOT_LIMITS_ENABLED);
2545 /* Generic routine for getting common part of quota structure */
2546 static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di)
2548 struct mem_dqblk *dm = &dquot->dq_dqb;
2550 memset(di, 0, sizeof(*di));
2551 spin_lock(&dq_data_lock);
2552 di->d_spc_hardlimit = dm->dqb_bhardlimit;
2553 di->d_spc_softlimit = dm->dqb_bsoftlimit;
2554 di->d_ino_hardlimit = dm->dqb_ihardlimit;
2555 di->d_ino_softlimit = dm->dqb_isoftlimit;
2556 di->d_space = dm->dqb_curspace + dm->dqb_rsvspace;
2557 di->d_ino_count = dm->dqb_curinodes;
2558 di->d_spc_timer = dm->dqb_btime;
2559 di->d_ino_timer = dm->dqb_itime;
2560 spin_unlock(&dq_data_lock);
2563 int dquot_get_dqblk(struct super_block *sb, struct kqid qid,
2564 struct qc_dqblk *di)
2566 struct dquot *dquot;
2568 dquot = dqget(sb, qid);
2570 return PTR_ERR(dquot);
2571 do_get_dqblk(dquot, di);
2576 EXPORT_SYMBOL(dquot_get_dqblk);
2578 int dquot_get_next_dqblk(struct super_block *sb, struct kqid *qid,
2579 struct qc_dqblk *di)
2581 struct dquot *dquot;
2584 if (!sb->dq_op->get_next_id)
2586 err = sb->dq_op->get_next_id(sb, qid);
2589 dquot = dqget(sb, *qid);
2591 return PTR_ERR(dquot);
2592 do_get_dqblk(dquot, di);
2597 EXPORT_SYMBOL(dquot_get_next_dqblk);
2599 #define VFS_QC_MASK \
2600 (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \
2601 QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \
2602 QC_SPC_TIMER | QC_INO_TIMER)
2604 /* Generic routine for setting common part of quota structure */
2605 static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di)
2607 struct mem_dqblk *dm = &dquot->dq_dqb;
2608 int check_blim = 0, check_ilim = 0;
2609 struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type];
2611 if (di->d_fieldmask & ~VFS_QC_MASK)
2614 if (((di->d_fieldmask & QC_SPC_SOFT) &&
2615 di->d_spc_softlimit > dqi->dqi_max_spc_limit) ||
2616 ((di->d_fieldmask & QC_SPC_HARD) &&
2617 di->d_spc_hardlimit > dqi->dqi_max_spc_limit) ||
2618 ((di->d_fieldmask & QC_INO_SOFT) &&
2619 (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) ||
2620 ((di->d_fieldmask & QC_INO_HARD) &&
2621 (di->d_ino_hardlimit > dqi->dqi_max_ino_limit)))
2624 spin_lock(&dq_data_lock);
2625 if (di->d_fieldmask & QC_SPACE) {
2626 dm->dqb_curspace = di->d_space - dm->dqb_rsvspace;
2628 set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
2631 if (di->d_fieldmask & QC_SPC_SOFT)
2632 dm->dqb_bsoftlimit = di->d_spc_softlimit;
2633 if (di->d_fieldmask & QC_SPC_HARD)
2634 dm->dqb_bhardlimit = di->d_spc_hardlimit;
2635 if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) {
2637 set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
2640 if (di->d_fieldmask & QC_INO_COUNT) {
2641 dm->dqb_curinodes = di->d_ino_count;
2643 set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
2646 if (di->d_fieldmask & QC_INO_SOFT)
2647 dm->dqb_isoftlimit = di->d_ino_softlimit;
2648 if (di->d_fieldmask & QC_INO_HARD)
2649 dm->dqb_ihardlimit = di->d_ino_hardlimit;
2650 if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) {
2652 set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
2655 if (di->d_fieldmask & QC_SPC_TIMER) {
2656 dm->dqb_btime = di->d_spc_timer;
2658 set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
2661 if (di->d_fieldmask & QC_INO_TIMER) {
2662 dm->dqb_itime = di->d_ino_timer;
2664 set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
2668 if (!dm->dqb_bsoftlimit ||
2669 dm->dqb_curspace < dm->dqb_bsoftlimit) {
2671 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
2672 } else if (!(di->d_fieldmask & QC_SPC_TIMER))
2673 /* Set grace only if user hasn't provided his own... */
2674 dm->dqb_btime = ktime_get_real_seconds() + dqi->dqi_bgrace;
2677 if (!dm->dqb_isoftlimit ||
2678 dm->dqb_curinodes < dm->dqb_isoftlimit) {
2680 clear_bit(DQ_INODES_B, &dquot->dq_flags);
2681 } else if (!(di->d_fieldmask & QC_INO_TIMER))
2682 /* Set grace only if user hasn't provided his own... */
2683 dm->dqb_itime = ktime_get_real_seconds() + dqi->dqi_igrace;
2685 if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit ||
2687 clear_bit(DQ_FAKE_B, &dquot->dq_flags);
2689 set_bit(DQ_FAKE_B, &dquot->dq_flags);
2690 spin_unlock(&dq_data_lock);
2691 mark_dquot_dirty(dquot);
2696 int dquot_set_dqblk(struct super_block *sb, struct kqid qid,
2697 struct qc_dqblk *di)
2699 struct dquot *dquot;
2702 dquot = dqget(sb, qid);
2703 if (IS_ERR(dquot)) {
2704 rc = PTR_ERR(dquot);
2707 rc = do_set_dqblk(dquot, di);
2712 EXPORT_SYMBOL(dquot_set_dqblk);
2714 /* Generic routine for getting common part of quota file information */
2715 int dquot_get_state(struct super_block *sb, struct qc_state *state)
2717 struct mem_dqinfo *mi;
2718 struct qc_type_state *tstate;
2719 struct quota_info *dqopt = sb_dqopt(sb);
2722 memset(state, 0, sizeof(*state));
2723 for (type = 0; type < MAXQUOTAS; type++) {
2724 if (!sb_has_quota_active(sb, type))
2726 tstate = state->s_state + type;
2727 mi = sb_dqopt(sb)->info + type;
2728 tstate->flags = QCI_ACCT_ENABLED;
2729 spin_lock(&dq_data_lock);
2730 if (mi->dqi_flags & DQF_SYS_FILE)
2731 tstate->flags |= QCI_SYSFILE;
2732 if (mi->dqi_flags & DQF_ROOT_SQUASH)
2733 tstate->flags |= QCI_ROOT_SQUASH;
2734 if (sb_has_quota_limits_enabled(sb, type))
2735 tstate->flags |= QCI_LIMITS_ENFORCED;
2736 tstate->spc_timelimit = mi->dqi_bgrace;
2737 tstate->ino_timelimit = mi->dqi_igrace;
2738 tstate->ino = dqopt->files[type]->i_ino;
2739 tstate->blocks = dqopt->files[type]->i_blocks;
2740 tstate->nextents = 1; /* We don't know... */
2741 spin_unlock(&dq_data_lock);
2745 EXPORT_SYMBOL(dquot_get_state);
2747 /* Generic routine for setting common part of quota file information */
2748 int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii)
2750 struct mem_dqinfo *mi;
2753 if ((ii->i_fieldmask & QC_WARNS_MASK) ||
2754 (ii->i_fieldmask & QC_RT_SPC_TIMER))
2756 if (!sb_has_quota_active(sb, type))
2758 mi = sb_dqopt(sb)->info + type;
2759 if (ii->i_fieldmask & QC_FLAGS) {
2760 if ((ii->i_flags & QCI_ROOT_SQUASH &&
2761 mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD))
2764 spin_lock(&dq_data_lock);
2765 if (ii->i_fieldmask & QC_SPC_TIMER)
2766 mi->dqi_bgrace = ii->i_spc_timelimit;
2767 if (ii->i_fieldmask & QC_INO_TIMER)
2768 mi->dqi_igrace = ii->i_ino_timelimit;
2769 if (ii->i_fieldmask & QC_FLAGS) {
2770 if (ii->i_flags & QCI_ROOT_SQUASH)
2771 mi->dqi_flags |= DQF_ROOT_SQUASH;
2773 mi->dqi_flags &= ~DQF_ROOT_SQUASH;
2775 spin_unlock(&dq_data_lock);
2776 mark_info_dirty(sb, type);
2777 /* Force write to disk */
2778 sb->dq_op->write_info(sb, type);
2781 EXPORT_SYMBOL(dquot_set_dqinfo);
2783 const struct quotactl_ops dquot_quotactl_sysfile_ops = {
2784 .quota_enable = dquot_quota_enable,
2785 .quota_disable = dquot_quota_disable,
2786 .quota_sync = dquot_quota_sync,
2787 .get_state = dquot_get_state,
2788 .set_info = dquot_set_dqinfo,
2789 .get_dqblk = dquot_get_dqblk,
2790 .get_nextdqblk = dquot_get_next_dqblk,
2791 .set_dqblk = dquot_set_dqblk
2793 EXPORT_SYMBOL(dquot_quotactl_sysfile_ops);
2795 static int do_proc_dqstats(struct ctl_table *table, int write,
2796 void __user *buffer, size_t *lenp, loff_t *ppos)
2798 unsigned int type = (int *)table->data - dqstats.stat;
2800 /* Update global table */
2801 dqstats.stat[type] =
2802 percpu_counter_sum_positive(&dqstats.counter[type]);
2803 return proc_dointvec(table, write, buffer, lenp, ppos);
2806 static struct ctl_table fs_dqstats_table[] = {
2808 .procname = "lookups",
2809 .data = &dqstats.stat[DQST_LOOKUPS],
2810 .maxlen = sizeof(int),
2812 .proc_handler = do_proc_dqstats,
2815 .procname = "drops",
2816 .data = &dqstats.stat[DQST_DROPS],
2817 .maxlen = sizeof(int),
2819 .proc_handler = do_proc_dqstats,
2822 .procname = "reads",
2823 .data = &dqstats.stat[DQST_READS],
2824 .maxlen = sizeof(int),
2826 .proc_handler = do_proc_dqstats,
2829 .procname = "writes",
2830 .data = &dqstats.stat[DQST_WRITES],
2831 .maxlen = sizeof(int),
2833 .proc_handler = do_proc_dqstats,
2836 .procname = "cache_hits",
2837 .data = &dqstats.stat[DQST_CACHE_HITS],
2838 .maxlen = sizeof(int),
2840 .proc_handler = do_proc_dqstats,
2843 .procname = "allocated_dquots",
2844 .data = &dqstats.stat[DQST_ALLOC_DQUOTS],
2845 .maxlen = sizeof(int),
2847 .proc_handler = do_proc_dqstats,
2850 .procname = "free_dquots",
2851 .data = &dqstats.stat[DQST_FREE_DQUOTS],
2852 .maxlen = sizeof(int),
2854 .proc_handler = do_proc_dqstats,
2857 .procname = "syncs",
2858 .data = &dqstats.stat[DQST_SYNCS],
2859 .maxlen = sizeof(int),
2861 .proc_handler = do_proc_dqstats,
2863 #ifdef CONFIG_PRINT_QUOTA_WARNING
2865 .procname = "warnings",
2866 .data = &flag_print_warnings,
2867 .maxlen = sizeof(int),
2869 .proc_handler = proc_dointvec,
2875 static struct ctl_table fs_table[] = {
2877 .procname = "quota",
2879 .child = fs_dqstats_table,
2884 static struct ctl_table sys_table[] = {
2893 static int __init dquot_init(void)
2896 unsigned long nr_hash, order;
2898 printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
2900 register_sysctl_table(sys_table);
2902 dquot_cachep = kmem_cache_create("dquot",
2903 sizeof(struct dquot), sizeof(unsigned long) * 4,
2904 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
2905 SLAB_MEM_SPREAD|SLAB_PANIC),
2909 dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
2911 panic("Cannot create dquot hash table");
2913 for (i = 0; i < _DQST_DQSTAT_LAST; i++) {
2914 ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL);
2916 panic("Cannot create dquot stat counters");
2919 /* Find power-of-two hlist_heads which can fit into allocation */
2920 nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
2924 } while (nr_hash >> dq_hash_bits);
2927 nr_hash = 1UL << dq_hash_bits;
2928 dq_hash_mask = nr_hash - 1;
2929 for (i = 0; i < nr_hash; i++)
2930 INIT_HLIST_HEAD(dquot_hash + i);
2932 pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld,"
2933 " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order));
2935 register_shrinker(&dqcache_shrinker);
2939 fs_initcall(dquot_init);