blob: dfba1623cccb27a8d79a5098ace72b729ae45669 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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.
11 *
12 * Version: $Id: dquot.c,v 6.3 1996/11/17 18:35:34 mvw Exp mvw $
13 *
14 * Author: Marco van Wieringen <mvw@planets.elm.net>
15 *
16 * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
17 *
18 * Revised list management to avoid races
19 * -- Bill Hawes, <whawes@star.net>, 9/98
20 *
21 * Fixed races in dquot_transfer(), dqget() and dquot_alloc_...().
22 * As the consequence the locking was moved from dquot_decr_...(),
23 * dquot_incr_...() to calling functions.
24 * invalidate_dquots() now writes modified dquots.
25 * Serialized quota_off() and quota_on() for mount point.
26 * Fixed a few bugs in grow_dquots().
27 * Fixed deadlock in write_dquot() - we no longer account quotas on
28 * quota files
29 * remove_dquot_ref() moved to inode.c - it now traverses through inodes
30 * add_dquot_ref() restarts after blocking
31 * Added check for bogus uid and fixed check for group in quotactl.
32 * Jan Kara, <jack@suse.cz>, sponsored by SuSE CR, 10-11/99
33 *
34 * Used struct list_head instead of own list struct
35 * Invalidation of referenced dquots is no longer possible
36 * Improved free_dquots list management
37 * Quota and i_blocks are now updated in one place to avoid races
38 * Warnings are now delayed so we won't block in critical section
39 * Write updated not to require dquot lock
40 * Jan Kara, <jack@suse.cz>, 9/2000
41 *
42 * Added dynamic quota structure allocation
43 * Jan Kara <jack@suse.cz> 12/2000
44 *
45 * Rewritten quota interface. Implemented new quota format and
46 * formats registering.
47 * Jan Kara, <jack@suse.cz>, 2001,2002
48 *
49 * New SMP locking.
50 * Jan Kara, <jack@suse.cz>, 10/2002
51 *
52 * Added journalled quota support, fix lock inversion problems
53 * Jan Kara, <jack@suse.cz>, 2003,2004
54 *
55 * (C) Copyright 1994 - 1997 Marco van Wieringen
56 */
57
58#include <linux/errno.h>
59#include <linux/kernel.h>
60#include <linux/fs.h>
61#include <linux/mount.h>
62#include <linux/mm.h>
63#include <linux/time.h>
64#include <linux/types.h>
65#include <linux/string.h>
66#include <linux/fcntl.h>
67#include <linux/stat.h>
68#include <linux/tty.h>
69#include <linux/file.h>
70#include <linux/slab.h>
71#include <linux/sysctl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#include <linux/init.h>
73#include <linux/module.h>
74#include <linux/proc_fs.h>
75#include <linux/security.h>
76#include <linux/kmod.h>
77#include <linux/namei.h>
78#include <linux/buffer_head.h>
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080079#include <linux/capability.h>
Adrian Bunkbe586ba2005-11-07 00:59:35 -080080#include <linux/quotaops.h>
Christoph Hellwigfb58b732007-02-12 00:51:57 -080081#include <linux/writeback.h> /* for inode_lock, oddly enough.. */
Jan Kara8e893462007-10-16 23:29:31 -070082#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
83#include <net/netlink.h>
84#include <net/genetlink.h>
85#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87#include <asm/uaccess.h>
88
89#define __DQUOT_PARANOIA
90
91/*
92 * There are two quota SMP locks. dq_list_lock protects all lists with quotas
93 * and quota formats and also dqstats structure containing statistics about the
94 * lists. dq_data_lock protects data from dq_dqb and also mem_dqinfo structures
95 * and also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
96 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
97 * in inode_add_bytes() and inode_sub_bytes().
98 *
99 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock
100 *
101 * Note that some things (eg. sb pointer, type, id) doesn't change during
102 * the life of the dquot structure and so needn't to be protected by a lock
103 *
104 * Any operation working on dquots via inode pointers must hold dqptr_sem. If
105 * operation is just reading pointers from inode (or not using them at all) the
106 * read lock is enough. If pointers are altered function must hold write lock
107 * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800108 * for altering the flag i_mutex is also needed). If operation is holding
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 * reference to dquot in other way (e.g. quotactl ops) it must be guarded by
Ingo Molnard3be9152006-03-23 03:00:29 -0800110 * dqonoff_mutex.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 * This locking assures that:
112 * a) update/access to dquot pointers in inode is serialized
113 * b) everyone is guarded against invalidate_dquots()
114 *
Ingo Molnard3be9152006-03-23 03:00:29 -0800115 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
117 * Currently dquot is locked only when it is being read to memory (or space for
118 * it is being allocated) on the first dqget() and when it is being released on
119 * the last dqput(). The allocation and release oparations are serialized by
120 * the dq_lock and by checking the use count in dquot_release(). Write
121 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
122 * spinlock to internal buffers before writing.
123 *
124 * Lock ordering (including related VFS locks) is the following:
Ingo Molnard3be9152006-03-23 03:00:29 -0800125 * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
126 * dqio_mutex
127 * i_mutex on quota files is special (it's below dqio_mutex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 */
129
130static DEFINE_SPINLOCK(dq_list_lock);
131DEFINE_SPINLOCK(dq_data_lock);
132
133static char *quotatypes[] = INITQFNAMES;
134static struct quota_format_type *quota_formats; /* List of registered formats */
135static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES;
136
137/* SLAB cache for dquot structures */
Christoph Lametere18b8902006-12-06 20:33:20 -0800138static struct kmem_cache *dquot_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
140int register_quota_format(struct quota_format_type *fmt)
141{
142 spin_lock(&dq_list_lock);
143 fmt->qf_next = quota_formats;
144 quota_formats = fmt;
145 spin_unlock(&dq_list_lock);
146 return 0;
147}
148
149void unregister_quota_format(struct quota_format_type *fmt)
150{
151 struct quota_format_type **actqf;
152
153 spin_lock(&dq_list_lock);
154 for (actqf = &quota_formats; *actqf && *actqf != fmt; actqf = &(*actqf)->qf_next);
155 if (*actqf)
156 *actqf = (*actqf)->qf_next;
157 spin_unlock(&dq_list_lock);
158}
159
160static struct quota_format_type *find_quota_format(int id)
161{
162 struct quota_format_type *actqf;
163
164 spin_lock(&dq_list_lock);
165 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
166 if (!actqf || !try_module_get(actqf->qf_owner)) {
167 int qm;
168
169 spin_unlock(&dq_list_lock);
170
171 for (qm = 0; module_names[qm].qm_fmt_id && module_names[qm].qm_fmt_id != id; qm++);
172 if (!module_names[qm].qm_fmt_id || request_module(module_names[qm].qm_mod_name))
173 return NULL;
174
175 spin_lock(&dq_list_lock);
176 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
177 if (actqf && !try_module_get(actqf->qf_owner))
178 actqf = NULL;
179 }
180 spin_unlock(&dq_list_lock);
181 return actqf;
182}
183
184static void put_quota_format(struct quota_format_type *fmt)
185{
186 module_put(fmt->qf_owner);
187}
188
189/*
190 * Dquot List Management:
191 * The quota code uses three lists for dquot management: the inuse_list,
192 * free_dquots, and dquot_hash[] array. A single dquot structure may be
193 * on all three lists, depending on its current state.
194 *
195 * All dquots are placed to the end of inuse_list when first created, and this
196 * list is used for invalidate operation, which must look at every dquot.
197 *
198 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
199 * and this list is searched whenever we need an available dquot. Dquots are
200 * removed from the list as soon as they are used again, and
201 * dqstats.free_dquots gives the number of dquots on the list. When
202 * dquot is invalidated it's completely released from memory.
203 *
204 * Dquots with a specific identity (device, type and id) are placed on
205 * one of the dquot_hash[] hash chains. The provides an efficient search
206 * mechanism to locate a specific dquot.
207 */
208
209static LIST_HEAD(inuse_list);
210static LIST_HEAD(free_dquots);
211static unsigned int dq_hash_bits, dq_hash_mask;
212static struct hlist_head *dquot_hash;
213
214struct dqstats dqstats;
215
216static void dqput(struct dquot *dquot);
217
218static inline unsigned int
219hashfn(const struct super_block *sb, unsigned int id, int type)
220{
221 unsigned long tmp;
222
223 tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
224 return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
225}
226
227/*
228 * Following list functions expect dq_list_lock to be held
229 */
230static inline void insert_dquot_hash(struct dquot *dquot)
231{
232 struct hlist_head *head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type);
233 hlist_add_head(&dquot->dq_hash, head);
234}
235
236static inline void remove_dquot_hash(struct dquot *dquot)
237{
238 hlist_del_init(&dquot->dq_hash);
239}
240
241static inline struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, unsigned int id, int type)
242{
243 struct hlist_node *node;
244 struct dquot *dquot;
245
246 hlist_for_each (node, dquot_hash+hashent) {
247 dquot = hlist_entry(node, struct dquot, dq_hash);
248 if (dquot->dq_sb == sb && dquot->dq_id == id && dquot->dq_type == type)
249 return dquot;
250 }
251 return NODQUOT;
252}
253
254/* Add a dquot to the tail of the free list */
255static inline void put_dquot_last(struct dquot *dquot)
256{
Akinobu Mita8e130592006-06-26 00:24:37 -0700257 list_add_tail(&dquot->dq_free, &free_dquots);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 dqstats.free_dquots++;
259}
260
261static inline void remove_free_dquot(struct dquot *dquot)
262{
263 if (list_empty(&dquot->dq_free))
264 return;
265 list_del_init(&dquot->dq_free);
266 dqstats.free_dquots--;
267}
268
269static inline void put_inuse(struct dquot *dquot)
270{
271 /* We add to the back of inuse list so we don't have to restart
272 * when traversing this list and we block */
Akinobu Mita8e130592006-06-26 00:24:37 -0700273 list_add_tail(&dquot->dq_inuse, &inuse_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 dqstats.allocated_dquots++;
275}
276
277static inline void remove_inuse(struct dquot *dquot)
278{
279 dqstats.allocated_dquots--;
280 list_del(&dquot->dq_inuse);
281}
282/*
283 * End of list functions needing dq_list_lock
284 */
285
286static void wait_on_dquot(struct dquot *dquot)
287{
Ingo Molnard3be9152006-03-23 03:00:29 -0800288 mutex_lock(&dquot->dq_lock);
289 mutex_unlock(&dquot->dq_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290}
291
Jan Kara03f6e922008-04-28 02:14:32 -0700292static inline int dquot_dirty(struct dquot *dquot)
293{
294 return test_bit(DQ_MOD_B, &dquot->dq_flags);
295}
296
297static inline int mark_dquot_dirty(struct dquot *dquot)
298{
299 return dquot->dq_sb->dq_op->mark_dirty(dquot);
300}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
302int dquot_mark_dquot_dirty(struct dquot *dquot)
303{
304 spin_lock(&dq_list_lock);
305 if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags))
306 list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
307 info[dquot->dq_type].dqi_dirty_list);
308 spin_unlock(&dq_list_lock);
309 return 0;
310}
311
312/* This function needs dq_list_lock */
313static inline int clear_dquot_dirty(struct dquot *dquot)
314{
315 if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
316 return 0;
317 list_del_init(&dquot->dq_dirty);
318 return 1;
319}
320
321void mark_info_dirty(struct super_block *sb, int type)
322{
323 set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
324}
325EXPORT_SYMBOL(mark_info_dirty);
326
327/*
328 * Read dquot from disk and alloc space for it
329 */
330
331int dquot_acquire(struct dquot *dquot)
332{
333 int ret = 0, ret2 = 0;
334 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
335
Ingo Molnard3be9152006-03-23 03:00:29 -0800336 mutex_lock(&dquot->dq_lock);
337 mutex_lock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 if (!test_bit(DQ_READ_B, &dquot->dq_flags))
339 ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
340 if (ret < 0)
341 goto out_iolock;
342 set_bit(DQ_READ_B, &dquot->dq_flags);
343 /* Instantiate dquot if needed */
344 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
345 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
346 /* Write the info if needed */
347 if (info_dirty(&dqopt->info[dquot->dq_type]))
348 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
349 if (ret < 0)
350 goto out_iolock;
351 if (ret2 < 0) {
352 ret = ret2;
353 goto out_iolock;
354 }
355 }
356 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
357out_iolock:
Ingo Molnard3be9152006-03-23 03:00:29 -0800358 mutex_unlock(&dqopt->dqio_mutex);
359 mutex_unlock(&dquot->dq_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 return ret;
361}
362
363/*
364 * Write dquot to disk
365 */
366int dquot_commit(struct dquot *dquot)
367{
368 int ret = 0, ret2 = 0;
369 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
370
Ingo Molnard3be9152006-03-23 03:00:29 -0800371 mutex_lock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 spin_lock(&dq_list_lock);
373 if (!clear_dquot_dirty(dquot)) {
374 spin_unlock(&dq_list_lock);
375 goto out_sem;
376 }
377 spin_unlock(&dq_list_lock);
378 /* Inactive dquot can be only if there was error during read/init
379 * => we have better not writing it */
380 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
381 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
382 if (info_dirty(&dqopt->info[dquot->dq_type]))
383 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
384 if (ret >= 0)
385 ret = ret2;
386 }
387out_sem:
Ingo Molnard3be9152006-03-23 03:00:29 -0800388 mutex_unlock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 return ret;
390}
391
392/*
393 * Release dquot
394 */
395int dquot_release(struct dquot *dquot)
396{
397 int ret = 0, ret2 = 0;
398 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
399
Ingo Molnard3be9152006-03-23 03:00:29 -0800400 mutex_lock(&dquot->dq_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 /* Check whether we are not racing with some other dqget() */
402 if (atomic_read(&dquot->dq_count) > 1)
403 goto out_dqlock;
Ingo Molnard3be9152006-03-23 03:00:29 -0800404 mutex_lock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 if (dqopt->ops[dquot->dq_type]->release_dqblk) {
406 ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
407 /* Write the info */
408 if (info_dirty(&dqopt->info[dquot->dq_type]))
409 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
410 if (ret >= 0)
411 ret = ret2;
412 }
413 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
Ingo Molnard3be9152006-03-23 03:00:29 -0800414 mutex_unlock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415out_dqlock:
Ingo Molnard3be9152006-03-23 03:00:29 -0800416 mutex_unlock(&dquot->dq_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 return ret;
418}
419
420/* Invalidate all dquots on the list. Note that this function is called after
421 * quota is disabled and pointers from inodes removed so there cannot be new
Jan Kara6362e4d2006-03-23 03:00:17 -0800422 * quota users. There can still be some users of quotas due to inodes being
423 * just deleted or pruned by prune_icache() (those are not attached to any
424 * list). We have to wait for such users.
425 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426static void invalidate_dquots(struct super_block *sb, int type)
427{
Domen Puncerc33ed272005-06-25 14:59:36 -0700428 struct dquot *dquot, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
Jan Kara6362e4d2006-03-23 03:00:17 -0800430restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 spin_lock(&dq_list_lock);
Domen Puncerc33ed272005-06-25 14:59:36 -0700432 list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 if (dquot->dq_sb != sb)
434 continue;
435 if (dquot->dq_type != type)
436 continue;
Jan Kara6362e4d2006-03-23 03:00:17 -0800437 /* Wait for dquot users */
438 if (atomic_read(&dquot->dq_count)) {
439 DEFINE_WAIT(wait);
440
441 atomic_inc(&dquot->dq_count);
442 prepare_to_wait(&dquot->dq_wait_unused, &wait,
443 TASK_UNINTERRUPTIBLE);
444 spin_unlock(&dq_list_lock);
445 /* Once dqput() wakes us up, we know it's time to free
446 * the dquot.
447 * IMPORTANT: we rely on the fact that there is always
448 * at most one process waiting for dquot to free.
449 * Otherwise dq_count would be > 1 and we would never
450 * wake up.
451 */
452 if (atomic_read(&dquot->dq_count) > 1)
453 schedule();
454 finish_wait(&dquot->dq_wait_unused, &wait);
455 dqput(dquot);
456 /* At this moment dquot() need not exist (it could be
457 * reclaimed by prune_dqcache(). Hence we must
458 * restart. */
459 goto restart;
460 }
461 /*
462 * Quota now has no users and it has been written on last
463 * dqput()
464 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 remove_dquot_hash(dquot);
466 remove_free_dquot(dquot);
467 remove_inuse(dquot);
468 kmem_cache_free(dquot_cachep, dquot);
469 }
470 spin_unlock(&dq_list_lock);
471}
472
473int vfs_quota_sync(struct super_block *sb, int type)
474{
475 struct list_head *dirty;
476 struct dquot *dquot;
477 struct quota_info *dqopt = sb_dqopt(sb);
478 int cnt;
479
Ingo Molnard3be9152006-03-23 03:00:29 -0800480 mutex_lock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
482 if (type != -1 && cnt != type)
483 continue;
484 if (!sb_has_quota_enabled(sb, cnt))
485 continue;
486 spin_lock(&dq_list_lock);
487 dirty = &dqopt->info[cnt].dqi_dirty_list;
488 while (!list_empty(dirty)) {
Pavel Emelianovb5e61812007-05-08 00:30:19 -0700489 dquot = list_first_entry(dirty, struct dquot, dq_dirty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 /* Dirty and inactive can be only bad dquot... */
491 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
492 clear_dquot_dirty(dquot);
493 continue;
494 }
495 /* Now we have active dquot from which someone is
496 * holding reference so we can safely just increase
497 * use count */
498 atomic_inc(&dquot->dq_count);
499 dqstats.lookups++;
500 spin_unlock(&dq_list_lock);
501 sb->dq_op->write_dquot(dquot);
502 dqput(dquot);
503 spin_lock(&dq_list_lock);
504 }
505 spin_unlock(&dq_list_lock);
506 }
507
508 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
509 if ((cnt == type || type == -1) && sb_has_quota_enabled(sb, cnt)
510 && info_dirty(&dqopt->info[cnt]))
511 sb->dq_op->write_info(sb, cnt);
512 spin_lock(&dq_list_lock);
513 dqstats.syncs++;
514 spin_unlock(&dq_list_lock);
Ingo Molnard3be9152006-03-23 03:00:29 -0800515 mutex_unlock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
517 return 0;
518}
519
520/* Free unused dquots from cache */
521static void prune_dqcache(int count)
522{
523 struct list_head *head;
524 struct dquot *dquot;
525
526 head = free_dquots.prev;
527 while (head != &free_dquots && count) {
528 dquot = list_entry(head, struct dquot, dq_free);
529 remove_dquot_hash(dquot);
530 remove_free_dquot(dquot);
531 remove_inuse(dquot);
532 kmem_cache_free(dquot_cachep, dquot);
533 count--;
534 head = free_dquots.prev;
535 }
536}
537
538/*
539 * This is called from kswapd when we think we need some
540 * more memory
541 */
542
Al Viro27496a82005-10-21 03:20:48 -0400543static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544{
545 if (nr) {
546 spin_lock(&dq_list_lock);
547 prune_dqcache(nr);
548 spin_unlock(&dq_list_lock);
549 }
550 return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure;
551}
552
Rusty Russell8e1f9362007-07-17 04:03:17 -0700553static struct shrinker dqcache_shrinker = {
554 .shrink = shrink_dqcache_memory,
555 .seeks = DEFAULT_SEEKS,
556};
557
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558/*
559 * Put reference to dquot
560 * NOTE: If you change this function please check whether dqput_blocks() works right...
Ingo Molnard3be9152006-03-23 03:00:29 -0800561 * MUST be called with either dqptr_sem or dqonoff_mutex held
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 */
563static void dqput(struct dquot *dquot)
564{
565 if (!dquot)
566 return;
567#ifdef __DQUOT_PARANOIA
568 if (!atomic_read(&dquot->dq_count)) {
569 printk("VFS: dqput: trying to free free dquot\n");
570 printk("VFS: device %s, dquot of %s %d\n",
571 dquot->dq_sb->s_id,
572 quotatypes[dquot->dq_type],
573 dquot->dq_id);
574 BUG();
575 }
576#endif
577
578 spin_lock(&dq_list_lock);
579 dqstats.drops++;
580 spin_unlock(&dq_list_lock);
581we_slept:
582 spin_lock(&dq_list_lock);
583 if (atomic_read(&dquot->dq_count) > 1) {
584 /* We have more than one user... nothing to do */
585 atomic_dec(&dquot->dq_count);
Jan Kara6362e4d2006-03-23 03:00:17 -0800586 /* Releasing dquot during quotaoff phase? */
587 if (!sb_has_quota_enabled(dquot->dq_sb, dquot->dq_type) &&
588 atomic_read(&dquot->dq_count) == 1)
589 wake_up(&dquot->dq_wait_unused);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 spin_unlock(&dq_list_lock);
591 return;
592 }
593 /* Need to release dquot? */
594 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
595 spin_unlock(&dq_list_lock);
596 /* Commit dquot before releasing */
597 dquot->dq_sb->dq_op->write_dquot(dquot);
598 goto we_slept;
599 }
600 /* Clear flag in case dquot was inactive (something bad happened) */
601 clear_dquot_dirty(dquot);
602 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
603 spin_unlock(&dq_list_lock);
604 dquot->dq_sb->dq_op->release_dquot(dquot);
605 goto we_slept;
606 }
607 atomic_dec(&dquot->dq_count);
608#ifdef __DQUOT_PARANOIA
609 /* sanity check */
Eric Sesterhenn8abf6a42006-04-02 13:36:13 +0200610 BUG_ON(!list_empty(&dquot->dq_free));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611#endif
612 put_dquot_last(dquot);
613 spin_unlock(&dq_list_lock);
614}
615
616static struct dquot *get_empty_dquot(struct super_block *sb, int type)
617{
618 struct dquot *dquot;
619
Robert P. J. Dayc3762222007-02-10 01:45:03 -0800620 dquot = kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 if(!dquot)
622 return NODQUOT;
623
Ingo Molnard3be9152006-03-23 03:00:29 -0800624 mutex_init(&dquot->dq_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 INIT_LIST_HEAD(&dquot->dq_free);
626 INIT_LIST_HEAD(&dquot->dq_inuse);
627 INIT_HLIST_NODE(&dquot->dq_hash);
628 INIT_LIST_HEAD(&dquot->dq_dirty);
Jan Kara6362e4d2006-03-23 03:00:17 -0800629 init_waitqueue_head(&dquot->dq_wait_unused);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 dquot->dq_sb = sb;
631 dquot->dq_type = type;
632 atomic_set(&dquot->dq_count, 1);
633
634 return dquot;
635}
636
637/*
638 * Get reference to dquot
Ingo Molnard3be9152006-03-23 03:00:29 -0800639 * MUST be called with either dqptr_sem or dqonoff_mutex held
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 */
641static struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
642{
643 unsigned int hashent = hashfn(sb, id, type);
644 struct dquot *dquot, *empty = NODQUOT;
645
646 if (!sb_has_quota_enabled(sb, type))
647 return NODQUOT;
648we_slept:
649 spin_lock(&dq_list_lock);
650 if ((dquot = find_dquot(hashent, sb, id, type)) == NODQUOT) {
651 if (empty == NODQUOT) {
652 spin_unlock(&dq_list_lock);
653 if ((empty = get_empty_dquot(sb, type)) == NODQUOT)
654 schedule(); /* Try to wait for a moment... */
655 goto we_slept;
656 }
657 dquot = empty;
658 dquot->dq_id = id;
659 /* all dquots go on the inuse_list */
660 put_inuse(dquot);
661 /* hash it first so it can be found */
662 insert_dquot_hash(dquot);
663 dqstats.lookups++;
664 spin_unlock(&dq_list_lock);
665 } else {
666 if (!atomic_read(&dquot->dq_count))
667 remove_free_dquot(dquot);
668 atomic_inc(&dquot->dq_count);
669 dqstats.cache_hits++;
670 dqstats.lookups++;
671 spin_unlock(&dq_list_lock);
672 if (empty)
673 kmem_cache_free(dquot_cachep, empty);
674 }
675 /* Wait for dq_lock - after this we know that either dquot_release() is already
676 * finished or it will be canceled due to dq_count > 1 test */
677 wait_on_dquot(dquot);
678 /* Read the dquot and instantiate it (everything done only if needed) */
679 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && sb->dq_op->acquire_dquot(dquot) < 0) {
680 dqput(dquot);
681 return NODQUOT;
682 }
683#ifdef __DQUOT_PARANOIA
Eric Sesterhenn8abf6a42006-04-02 13:36:13 +0200684 BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685#endif
686
687 return dquot;
688}
689
690static int dqinit_needed(struct inode *inode, int type)
691{
692 int cnt;
693
694 if (IS_NOQUOTA(inode))
695 return 0;
696 if (type != -1)
697 return inode->i_dquot[type] == NODQUOT;
698 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
699 if (inode->i_dquot[cnt] == NODQUOT)
700 return 1;
701 return 0;
702}
703
Ingo Molnard3be9152006-03-23 03:00:29 -0800704/* This routine is guarded by dqonoff_mutex mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705static void add_dquot_ref(struct super_block *sb, int type)
706{
Jan Kara941d2382008-02-06 01:37:36 -0800707 struct inode *inode, *old_inode = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
Christoph Hellwigd003fb72007-02-12 00:51:58 -0800709 spin_lock(&inode_lock);
710 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
711 if (!atomic_read(&inode->i_writecount))
712 continue;
713 if (!dqinit_needed(inode, type))
714 continue;
715 if (inode->i_state & (I_FREEING|I_WILL_FREE))
716 continue;
717
718 __iget(inode);
719 spin_unlock(&inode_lock);
720
Jan Kara941d2382008-02-06 01:37:36 -0800721 iput(old_inode);
Christoph Hellwigd003fb72007-02-12 00:51:58 -0800722 sb->dq_op->initialize(inode, type);
Jan Kara941d2382008-02-06 01:37:36 -0800723 /* We hold a reference to 'inode' so it couldn't have been
724 * removed from s_inodes list while we dropped the inode_lock.
725 * We cannot iput the inode now as we can be holding the last
726 * reference and we cannot iput it under inode_lock. So we
727 * keep the reference and iput it later. */
728 old_inode = inode;
729 spin_lock(&inode_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 }
Christoph Hellwigd003fb72007-02-12 00:51:58 -0800731 spin_unlock(&inode_lock);
Jan Kara941d2382008-02-06 01:37:36 -0800732 iput(old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733}
734
735/* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */
736static inline int dqput_blocks(struct dquot *dquot)
737{
738 if (atomic_read(&dquot->dq_count) <= 1)
739 return 1;
740 return 0;
741}
742
743/* Remove references to dquots from inode - add dquot to list for freeing if needed */
744/* We can't race with anybody because we hold dqptr_sem for writing... */
Adrian Bunke5f00f42007-05-08 00:27:22 -0700745static int remove_inode_dquot_ref(struct inode *inode, int type,
746 struct list_head *tofree_head)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747{
748 struct dquot *dquot = inode->i_dquot[type];
749
750 inode->i_dquot[type] = NODQUOT;
751 if (dquot != NODQUOT) {
752 if (dqput_blocks(dquot)) {
753#ifdef __DQUOT_PARANOIA
754 if (atomic_read(&dquot->dq_count) != 1)
755 printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count));
756#endif
757 spin_lock(&dq_list_lock);
758 list_add(&dquot->dq_free, tofree_head); /* As dquot must have currently users it can't be on the free list... */
759 spin_unlock(&dq_list_lock);
760 return 1;
761 }
762 else
763 dqput(dquot); /* We have guaranteed we won't block */
764 }
765 return 0;
766}
767
768/* Free list of dquots - called from inode.c */
769/* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */
770static void put_dquot_list(struct list_head *tofree_head)
771{
772 struct list_head *act_head;
773 struct dquot *dquot;
774
775 act_head = tofree_head->next;
776 /* So now we have dquots on the list... Just free them */
777 while (act_head != tofree_head) {
778 dquot = list_entry(act_head, struct dquot, dq_free);
779 act_head = act_head->next;
780 list_del_init(&dquot->dq_free); /* Remove dquot from the list so we won't have problems... */
781 dqput(dquot);
782 }
783}
784
Christoph Hellwigfb58b732007-02-12 00:51:57 -0800785static void remove_dquot_ref(struct super_block *sb, int type,
786 struct list_head *tofree_head)
787{
788 struct inode *inode;
789
790 spin_lock(&inode_lock);
791 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
792 if (!IS_NOQUOTA(inode))
793 remove_inode_dquot_ref(inode, type, tofree_head);
794 }
795 spin_unlock(&inode_lock);
796}
797
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798/* Gather all references from inodes and drop them */
799static void drop_dquot_ref(struct super_block *sb, int type)
800{
801 LIST_HEAD(tofree_head);
802
Christoph Hellwigfb58b732007-02-12 00:51:57 -0800803 if (sb->dq_op) {
804 down_write(&sb_dqopt(sb)->dqptr_sem);
805 remove_dquot_ref(sb, type, &tofree_head);
806 up_write(&sb_dqopt(sb)->dqptr_sem);
807 put_dquot_list(&tofree_head);
808 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809}
810
811static inline void dquot_incr_inodes(struct dquot *dquot, unsigned long number)
812{
813 dquot->dq_dqb.dqb_curinodes += number;
814}
815
816static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
817{
818 dquot->dq_dqb.dqb_curspace += number;
819}
820
821static inline void dquot_decr_inodes(struct dquot *dquot, unsigned long number)
822{
823 if (dquot->dq_dqb.dqb_curinodes > number)
824 dquot->dq_dqb.dqb_curinodes -= number;
825 else
826 dquot->dq_dqb.dqb_curinodes = 0;
827 if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
828 dquot->dq_dqb.dqb_itime = (time_t) 0;
829 clear_bit(DQ_INODES_B, &dquot->dq_flags);
830}
831
832static inline void dquot_decr_space(struct dquot *dquot, qsize_t number)
833{
834 if (dquot->dq_dqb.dqb_curspace > number)
835 dquot->dq_dqb.dqb_curspace -= number;
836 else
837 dquot->dq_dqb.dqb_curspace = 0;
838 if (toqb(dquot->dq_dqb.dqb_curspace) <= dquot->dq_dqb.dqb_bsoftlimit)
839 dquot->dq_dqb.dqb_btime = (time_t) 0;
840 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
841}
842
Jan Karac5254602007-12-22 14:03:25 -0800843static int warning_issued(struct dquot *dquot, const int warntype)
844{
845 int flag = (warntype == QUOTA_NL_BHARDWARN ||
846 warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
847 ((warntype == QUOTA_NL_IHARDWARN ||
848 warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
849
850 if (!flag)
851 return 0;
852 return test_and_set_bit(flag, &dquot->dq_flags);
853}
854
Jan Kara8e893462007-10-16 23:29:31 -0700855#ifdef CONFIG_PRINT_QUOTA_WARNING
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856static int flag_print_warnings = 1;
857
858static inline int need_print_warning(struct dquot *dquot)
859{
860 if (!flag_print_warnings)
861 return 0;
862
863 switch (dquot->dq_type) {
864 case USRQUOTA:
865 return current->fsuid == dquot->dq_id;
866 case GRPQUOTA:
867 return in_group_p(dquot->dq_id);
868 }
869 return 0;
870}
871
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872/* Print warning to user which exceeded quota */
Jan Karac5254602007-12-22 14:03:25 -0800873static void print_warning(struct dquot *dquot, const int warntype)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874{
875 char *msg = NULL;
Peter Zijlstra24ec8392006-12-08 02:36:04 -0800876 struct tty_struct *tty;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877
Jan Karac5254602007-12-22 14:03:25 -0800878 if (!need_print_warning(dquot))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 return;
880
Jan Karab525a7e2006-09-29 02:00:26 -0700881 mutex_lock(&tty_mutex);
Peter Zijlstra24ec8392006-12-08 02:36:04 -0800882 tty = get_current_tty();
883 if (!tty)
Jan Karab525a7e2006-09-29 02:00:26 -0700884 goto out_lock;
Peter Zijlstra24ec8392006-12-08 02:36:04 -0800885 tty_write_message(tty, dquot->dq_sb->s_id);
Jan Kara8e893462007-10-16 23:29:31 -0700886 if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
Peter Zijlstra24ec8392006-12-08 02:36:04 -0800887 tty_write_message(tty, ": warning, ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 else
Peter Zijlstra24ec8392006-12-08 02:36:04 -0800889 tty_write_message(tty, ": write failed, ");
890 tty_write_message(tty, quotatypes[dquot->dq_type]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 switch (warntype) {
Jan Kara8e893462007-10-16 23:29:31 -0700892 case QUOTA_NL_IHARDWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 msg = " file limit reached.\r\n";
894 break;
Jan Kara8e893462007-10-16 23:29:31 -0700895 case QUOTA_NL_ISOFTLONGWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 msg = " file quota exceeded too long.\r\n";
897 break;
Jan Kara8e893462007-10-16 23:29:31 -0700898 case QUOTA_NL_ISOFTWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 msg = " file quota exceeded.\r\n";
900 break;
Jan Kara8e893462007-10-16 23:29:31 -0700901 case QUOTA_NL_BHARDWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 msg = " block limit reached.\r\n";
903 break;
Jan Kara8e893462007-10-16 23:29:31 -0700904 case QUOTA_NL_BSOFTLONGWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 msg = " block quota exceeded too long.\r\n";
906 break;
Jan Kara8e893462007-10-16 23:29:31 -0700907 case QUOTA_NL_BSOFTWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 msg = " block quota exceeded.\r\n";
909 break;
910 }
Peter Zijlstra24ec8392006-12-08 02:36:04 -0800911 tty_write_message(tty, msg);
Jan Karab525a7e2006-09-29 02:00:26 -0700912out_lock:
913 mutex_unlock(&tty_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914}
Jan Kara8e893462007-10-16 23:29:31 -0700915#endif
916
917#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
918
Jan Kara8e893462007-10-16 23:29:31 -0700919/* Netlink family structure for quota */
920static struct genl_family quota_genl_family = {
921 .id = GENL_ID_GENERATE,
922 .hdrsize = 0,
923 .name = "VFS_DQUOT",
924 .version = 1,
925 .maxattr = QUOTA_NL_A_MAX,
926};
927
928/* Send warning to userspace about user which exceeded quota */
929static void send_warning(const struct dquot *dquot, const char warntype)
930{
931 static atomic_t seq;
932 struct sk_buff *skb;
933 void *msg_head;
934 int ret;
Jan Kara22dd4832007-12-22 14:03:25 -0800935 int msg_size = 4 * nla_total_size(sizeof(u32)) +
936 2 * nla_total_size(sizeof(u64));
Jan Kara8e893462007-10-16 23:29:31 -0700937
938 /* We have to allocate using GFP_NOFS as we are called from a
939 * filesystem performing write and thus further recursion into
940 * the fs to free some data could cause deadlocks. */
Jan Kara22dd4832007-12-22 14:03:25 -0800941 skb = genlmsg_new(msg_size, GFP_NOFS);
Jan Kara8e893462007-10-16 23:29:31 -0700942 if (!skb) {
943 printk(KERN_ERR
944 "VFS: Not enough memory to send quota warning.\n");
945 return;
946 }
947 msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq),
948 &quota_genl_family, 0, QUOTA_NL_C_WARNING);
949 if (!msg_head) {
950 printk(KERN_ERR
951 "VFS: Cannot store netlink header in quota warning.\n");
952 goto err_out;
953 }
954 ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, dquot->dq_type);
955 if (ret)
956 goto attr_err_out;
957 ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, dquot->dq_id);
958 if (ret)
959 goto attr_err_out;
960 ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype);
961 if (ret)
962 goto attr_err_out;
963 ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR,
964 MAJOR(dquot->dq_sb->s_dev));
965 if (ret)
966 goto attr_err_out;
967 ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR,
968 MINOR(dquot->dq_sb->s_dev));
969 if (ret)
970 goto attr_err_out;
971 ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current->user->uid);
972 if (ret)
973 goto attr_err_out;
974 genlmsg_end(skb, msg_head);
975
976 ret = genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS);
977 if (ret < 0 && ret != -ESRCH)
978 printk(KERN_ERR
979 "VFS: Failed to send notification message: %d\n", ret);
980 return;
981attr_err_out:
Jan Kara22dd4832007-12-22 14:03:25 -0800982 printk(KERN_ERR "VFS: Not enough space to compose quota message!\n");
Jan Kara8e893462007-10-16 23:29:31 -0700983err_out:
984 kfree_skb(skb);
985}
986#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987
Jan Kara087ee8d2007-12-17 16:20:26 -0800988static inline void flush_warnings(struct dquot * const *dquots, char *warntype)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989{
990 int i;
991
992 for (i = 0; i < MAXQUOTAS; i++)
Jan Karac5254602007-12-22 14:03:25 -0800993 if (dquots[i] != NODQUOT && warntype[i] != QUOTA_NL_NOWARN &&
994 !warning_issued(dquots[i], warntype[i])) {
Jan Kara8e893462007-10-16 23:29:31 -0700995#ifdef CONFIG_PRINT_QUOTA_WARNING
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 print_warning(dquots[i], warntype[i]);
Jan Kara8e893462007-10-16 23:29:31 -0700997#endif
998#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
999 send_warning(dquots[i], warntype[i]);
1000#endif
1001 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002}
1003
1004static inline char ignore_hardlimit(struct dquot *dquot)
1005{
1006 struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
1007
1008 return capable(CAP_SYS_RESOURCE) &&
1009 (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || !(info->dqi_flags & V1_DQF_RSQUASH));
1010}
1011
1012/* needs dq_data_lock */
1013static int check_idq(struct dquot *dquot, ulong inodes, char *warntype)
1014{
Jan Kara8e893462007-10-16 23:29:31 -07001015 *warntype = QUOTA_NL_NOWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 if (inodes <= 0 || test_bit(DQ_FAKE_B, &dquot->dq_flags))
1017 return QUOTA_OK;
1018
1019 if (dquot->dq_dqb.dqb_ihardlimit &&
1020 (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_ihardlimit &&
1021 !ignore_hardlimit(dquot)) {
Jan Kara8e893462007-10-16 23:29:31 -07001022 *warntype = QUOTA_NL_IHARDWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 return NO_QUOTA;
1024 }
1025
1026 if (dquot->dq_dqb.dqb_isoftlimit &&
1027 (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit &&
1028 dquot->dq_dqb.dqb_itime && get_seconds() >= dquot->dq_dqb.dqb_itime &&
1029 !ignore_hardlimit(dquot)) {
Jan Kara8e893462007-10-16 23:29:31 -07001030 *warntype = QUOTA_NL_ISOFTLONGWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 return NO_QUOTA;
1032 }
1033
1034 if (dquot->dq_dqb.dqb_isoftlimit &&
1035 (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit &&
1036 dquot->dq_dqb.dqb_itime == 0) {
Jan Kara8e893462007-10-16 23:29:31 -07001037 *warntype = QUOTA_NL_ISOFTWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 dquot->dq_dqb.dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
1039 }
1040
1041 return QUOTA_OK;
1042}
1043
1044/* needs dq_data_lock */
1045static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype)
1046{
Jan Kara8e893462007-10-16 23:29:31 -07001047 *warntype = QUOTA_NL_NOWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 if (space <= 0 || test_bit(DQ_FAKE_B, &dquot->dq_flags))
1049 return QUOTA_OK;
1050
1051 if (dquot->dq_dqb.dqb_bhardlimit &&
1052 toqb(dquot->dq_dqb.dqb_curspace + space) > dquot->dq_dqb.dqb_bhardlimit &&
1053 !ignore_hardlimit(dquot)) {
1054 if (!prealloc)
Jan Kara8e893462007-10-16 23:29:31 -07001055 *warntype = QUOTA_NL_BHARDWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 return NO_QUOTA;
1057 }
1058
1059 if (dquot->dq_dqb.dqb_bsoftlimit &&
1060 toqb(dquot->dq_dqb.dqb_curspace + space) > dquot->dq_dqb.dqb_bsoftlimit &&
1061 dquot->dq_dqb.dqb_btime && get_seconds() >= dquot->dq_dqb.dqb_btime &&
1062 !ignore_hardlimit(dquot)) {
1063 if (!prealloc)
Jan Kara8e893462007-10-16 23:29:31 -07001064 *warntype = QUOTA_NL_BSOFTLONGWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 return NO_QUOTA;
1066 }
1067
1068 if (dquot->dq_dqb.dqb_bsoftlimit &&
1069 toqb(dquot->dq_dqb.dqb_curspace + space) > dquot->dq_dqb.dqb_bsoftlimit &&
1070 dquot->dq_dqb.dqb_btime == 0) {
1071 if (!prealloc) {
Jan Kara8e893462007-10-16 23:29:31 -07001072 *warntype = QUOTA_NL_BSOFTWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 dquot->dq_dqb.dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace;
1074 }
1075 else
1076 /*
1077 * We don't allow preallocation to exceed softlimit so exceeding will
1078 * be always printed
1079 */
1080 return NO_QUOTA;
1081 }
1082
1083 return QUOTA_OK;
1084}
1085
1086/*
1087 * Initialize quota pointers in inode
1088 * Transaction must be started at entry
1089 */
1090int dquot_initialize(struct inode *inode, int type)
1091{
1092 unsigned int id = 0;
1093 int cnt, ret = 0;
1094
Ingo Molnard3be9152006-03-23 03:00:29 -08001095 /* First test before acquiring mutex - solves deadlocks when we
1096 * re-enter the quota code and are already holding the mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 if (IS_NOQUOTA(inode))
1098 return 0;
1099 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1100 /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
1101 if (IS_NOQUOTA(inode))
1102 goto out_err;
1103 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1104 if (type != -1 && cnt != type)
1105 continue;
1106 if (inode->i_dquot[cnt] == NODQUOT) {
1107 switch (cnt) {
1108 case USRQUOTA:
1109 id = inode->i_uid;
1110 break;
1111 case GRPQUOTA:
1112 id = inode->i_gid;
1113 break;
1114 }
1115 inode->i_dquot[cnt] = dqget(inode->i_sb, id, cnt);
1116 }
1117 }
1118out_err:
1119 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1120 return ret;
1121}
1122
1123/*
1124 * Release all quotas referenced by inode
1125 * Transaction must be started at an entry
1126 */
1127int dquot_drop(struct inode *inode)
1128{
1129 int cnt;
1130
1131 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1132 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1133 if (inode->i_dquot[cnt] != NODQUOT) {
1134 dqput(inode->i_dquot[cnt]);
1135 inode->i_dquot[cnt] = NODQUOT;
1136 }
1137 }
1138 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1139 return 0;
1140}
1141
1142/*
1143 * Following four functions update i_blocks+i_bytes fields and
1144 * quota information (together with appropriate checks)
1145 * NOTE: We absolutely rely on the fact that caller dirties
1146 * the inode (usually macros in quotaops.h care about this) and
1147 * holds a handle for the current transaction so that dquot write and
1148 * inode write go into the same transaction.
1149 */
1150
1151/*
1152 * This operation can block, but only after everything is updated
1153 */
1154int dquot_alloc_space(struct inode *inode, qsize_t number, int warn)
1155{
1156 int cnt, ret = NO_QUOTA;
1157 char warntype[MAXQUOTAS];
1158
Ingo Molnard3be9152006-03-23 03:00:29 -08001159 /* First test before acquiring mutex - solves deadlocks when we
1160 * re-enter the quota code and are already holding the mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 if (IS_NOQUOTA(inode)) {
1162out_add:
1163 inode_add_bytes(inode, number);
1164 return QUOTA_OK;
1165 }
1166 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
Jan Kara8e893462007-10-16 23:29:31 -07001167 warntype[cnt] = QUOTA_NL_NOWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168
1169 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1170 if (IS_NOQUOTA(inode)) { /* Now we can do reliable test... */
1171 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1172 goto out_add;
1173 }
1174 spin_lock(&dq_data_lock);
1175 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1176 if (inode->i_dquot[cnt] == NODQUOT)
1177 continue;
1178 if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) == NO_QUOTA)
1179 goto warn_put_all;
1180 }
1181 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1182 if (inode->i_dquot[cnt] == NODQUOT)
1183 continue;
1184 dquot_incr_space(inode->i_dquot[cnt], number);
1185 }
1186 inode_add_bytes(inode, number);
1187 ret = QUOTA_OK;
1188warn_put_all:
1189 spin_unlock(&dq_data_lock);
1190 if (ret == QUOTA_OK)
1191 /* Dirtify all the dquots - this can block when journalling */
1192 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1193 if (inode->i_dquot[cnt])
1194 mark_dquot_dirty(inode->i_dquot[cnt]);
1195 flush_warnings(inode->i_dquot, warntype);
1196 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1197 return ret;
1198}
1199
1200/*
1201 * This operation can block, but only after everything is updated
1202 */
1203int dquot_alloc_inode(const struct inode *inode, unsigned long number)
1204{
1205 int cnt, ret = NO_QUOTA;
1206 char warntype[MAXQUOTAS];
1207
Ingo Molnard3be9152006-03-23 03:00:29 -08001208 /* First test before acquiring mutex - solves deadlocks when we
1209 * re-enter the quota code and are already holding the mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 if (IS_NOQUOTA(inode))
1211 return QUOTA_OK;
1212 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
Jan Kara8e893462007-10-16 23:29:31 -07001213 warntype[cnt] = QUOTA_NL_NOWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1215 if (IS_NOQUOTA(inode)) {
1216 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1217 return QUOTA_OK;
1218 }
1219 spin_lock(&dq_data_lock);
1220 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1221 if (inode->i_dquot[cnt] == NODQUOT)
1222 continue;
1223 if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) == NO_QUOTA)
1224 goto warn_put_all;
1225 }
1226
1227 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1228 if (inode->i_dquot[cnt] == NODQUOT)
1229 continue;
1230 dquot_incr_inodes(inode->i_dquot[cnt], number);
1231 }
1232 ret = QUOTA_OK;
1233warn_put_all:
1234 spin_unlock(&dq_data_lock);
1235 if (ret == QUOTA_OK)
1236 /* Dirtify all the dquots - this can block when journalling */
1237 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1238 if (inode->i_dquot[cnt])
1239 mark_dquot_dirty(inode->i_dquot[cnt]);
Jan Kara087ee8d2007-12-17 16:20:26 -08001240 flush_warnings(inode->i_dquot, warntype);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1242 return ret;
1243}
1244
1245/*
1246 * This operation can block, but only after everything is updated
1247 */
1248int dquot_free_space(struct inode *inode, qsize_t number)
1249{
1250 unsigned int cnt;
1251
Ingo Molnard3be9152006-03-23 03:00:29 -08001252 /* First test before acquiring mutex - solves deadlocks when we
1253 * re-enter the quota code and are already holding the mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 if (IS_NOQUOTA(inode)) {
1255out_sub:
1256 inode_sub_bytes(inode, number);
1257 return QUOTA_OK;
1258 }
1259 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1260 /* Now recheck reliably when holding dqptr_sem */
1261 if (IS_NOQUOTA(inode)) {
1262 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1263 goto out_sub;
1264 }
1265 spin_lock(&dq_data_lock);
1266 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1267 if (inode->i_dquot[cnt] == NODQUOT)
1268 continue;
1269 dquot_decr_space(inode->i_dquot[cnt], number);
1270 }
1271 inode_sub_bytes(inode, number);
1272 spin_unlock(&dq_data_lock);
1273 /* Dirtify all the dquots - this can block when journalling */
1274 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1275 if (inode->i_dquot[cnt])
1276 mark_dquot_dirty(inode->i_dquot[cnt]);
1277 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1278 return QUOTA_OK;
1279}
1280
1281/*
1282 * This operation can block, but only after everything is updated
1283 */
1284int dquot_free_inode(const struct inode *inode, unsigned long number)
1285{
1286 unsigned int cnt;
1287
Ingo Molnard3be9152006-03-23 03:00:29 -08001288 /* First test before acquiring mutex - solves deadlocks when we
1289 * re-enter the quota code and are already holding the mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 if (IS_NOQUOTA(inode))
1291 return QUOTA_OK;
1292 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1293 /* Now recheck reliably when holding dqptr_sem */
1294 if (IS_NOQUOTA(inode)) {
1295 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1296 return QUOTA_OK;
1297 }
1298 spin_lock(&dq_data_lock);
1299 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1300 if (inode->i_dquot[cnt] == NODQUOT)
1301 continue;
1302 dquot_decr_inodes(inode->i_dquot[cnt], number);
1303 }
1304 spin_unlock(&dq_data_lock);
1305 /* Dirtify all the dquots - this can block when journalling */
1306 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1307 if (inode->i_dquot[cnt])
1308 mark_dquot_dirty(inode->i_dquot[cnt]);
1309 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1310 return QUOTA_OK;
1311}
1312
1313/*
1314 * Transfer the number of inode and blocks from one diskquota to an other.
1315 *
1316 * This operation can block, but only after everything is updated
1317 * A transaction must be started when entering this function.
1318 */
1319int dquot_transfer(struct inode *inode, struct iattr *iattr)
1320{
1321 qsize_t space;
1322 struct dquot *transfer_from[MAXQUOTAS];
1323 struct dquot *transfer_to[MAXQUOTAS];
1324 int cnt, ret = NO_QUOTA, chuid = (iattr->ia_valid & ATTR_UID) && inode->i_uid != iattr->ia_uid,
1325 chgid = (iattr->ia_valid & ATTR_GID) && inode->i_gid != iattr->ia_gid;
1326 char warntype[MAXQUOTAS];
1327
Ingo Molnard3be9152006-03-23 03:00:29 -08001328 /* First test before acquiring mutex - solves deadlocks when we
1329 * re-enter the quota code and are already holding the mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 if (IS_NOQUOTA(inode))
1331 return QUOTA_OK;
1332 /* Clear the arrays */
1333 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1334 transfer_to[cnt] = transfer_from[cnt] = NODQUOT;
Jan Kara8e893462007-10-16 23:29:31 -07001335 warntype[cnt] = QUOTA_NL_NOWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 }
1337 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1338 /* Now recheck reliably when holding dqptr_sem */
1339 if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
1340 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1341 return QUOTA_OK;
1342 }
1343 /* First build the transfer_to list - here we can block on
1344 * reading/instantiating of dquots. We know that the transaction for
1345 * us was already started so we don't violate lock ranking here */
1346 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1347 switch (cnt) {
1348 case USRQUOTA:
1349 if (!chuid)
1350 continue;
1351 transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_uid, cnt);
1352 break;
1353 case GRPQUOTA:
1354 if (!chgid)
1355 continue;
1356 transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_gid, cnt);
1357 break;
1358 }
1359 }
1360 spin_lock(&dq_data_lock);
1361 space = inode_get_bytes(inode);
1362 /* Build the transfer_from list and check the limits */
1363 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1364 if (transfer_to[cnt] == NODQUOT)
1365 continue;
1366 transfer_from[cnt] = inode->i_dquot[cnt];
1367 if (check_idq(transfer_to[cnt], 1, warntype+cnt) == NO_QUOTA ||
1368 check_bdq(transfer_to[cnt], space, 0, warntype+cnt) == NO_QUOTA)
1369 goto warn_put_all;
1370 }
1371
1372 /*
1373 * Finally perform the needed transfer from transfer_from to transfer_to
1374 */
1375 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1376 /*
1377 * Skip changes for same uid or gid or for turned off quota-type.
1378 */
1379 if (transfer_to[cnt] == NODQUOT)
1380 continue;
1381
1382 /* Due to IO error we might not have transfer_from[] structure */
1383 if (transfer_from[cnt]) {
1384 dquot_decr_inodes(transfer_from[cnt], 1);
1385 dquot_decr_space(transfer_from[cnt], space);
1386 }
1387
1388 dquot_incr_inodes(transfer_to[cnt], 1);
1389 dquot_incr_space(transfer_to[cnt], space);
1390
1391 inode->i_dquot[cnt] = transfer_to[cnt];
1392 }
1393 ret = QUOTA_OK;
1394warn_put_all:
1395 spin_unlock(&dq_data_lock);
1396 /* Dirtify all the dquots - this can block when journalling */
1397 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1398 if (transfer_from[cnt])
1399 mark_dquot_dirty(transfer_from[cnt]);
1400 if (transfer_to[cnt])
1401 mark_dquot_dirty(transfer_to[cnt]);
1402 }
1403 flush_warnings(transfer_to, warntype);
1404
1405 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1406 if (ret == QUOTA_OK && transfer_from[cnt] != NODQUOT)
1407 dqput(transfer_from[cnt]);
1408 if (ret == NO_QUOTA && transfer_to[cnt] != NODQUOT)
1409 dqput(transfer_to[cnt]);
1410 }
1411 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1412 return ret;
1413}
1414
1415/*
1416 * Write info of quota file to disk
1417 */
1418int dquot_commit_info(struct super_block *sb, int type)
1419{
1420 int ret;
1421 struct quota_info *dqopt = sb_dqopt(sb);
1422
Ingo Molnard3be9152006-03-23 03:00:29 -08001423 mutex_lock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 ret = dqopt->ops[type]->write_file_info(sb, type);
Ingo Molnard3be9152006-03-23 03:00:29 -08001425 mutex_unlock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426 return ret;
1427}
1428
1429/*
1430 * Definitions of diskquota operations.
1431 */
1432struct dquot_operations dquot_operations = {
1433 .initialize = dquot_initialize,
1434 .drop = dquot_drop,
1435 .alloc_space = dquot_alloc_space,
1436 .alloc_inode = dquot_alloc_inode,
1437 .free_space = dquot_free_space,
1438 .free_inode = dquot_free_inode,
1439 .transfer = dquot_transfer,
1440 .write_dquot = dquot_commit,
1441 .acquire_dquot = dquot_acquire,
1442 .release_dquot = dquot_release,
1443 .mark_dirty = dquot_mark_dquot_dirty,
1444 .write_info = dquot_commit_info
1445};
1446
1447static inline void set_enable_flags(struct quota_info *dqopt, int type)
1448{
1449 switch (type) {
1450 case USRQUOTA:
1451 dqopt->flags |= DQUOT_USR_ENABLED;
Jan Kara0ff5af82008-04-28 02:14:33 -07001452 dqopt->flags &= ~DQUOT_USR_SUSPENDED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 break;
1454 case GRPQUOTA:
1455 dqopt->flags |= DQUOT_GRP_ENABLED;
Jan Kara0ff5af82008-04-28 02:14:33 -07001456 dqopt->flags &= ~DQUOT_GRP_SUSPENDED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 break;
1458 }
1459}
1460
Jan Kara0ff5af82008-04-28 02:14:33 -07001461static inline void reset_enable_flags(struct quota_info *dqopt, int type,
1462 int remount)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463{
1464 switch (type) {
1465 case USRQUOTA:
1466 dqopt->flags &= ~DQUOT_USR_ENABLED;
Jan Kara0ff5af82008-04-28 02:14:33 -07001467 if (remount)
1468 dqopt->flags |= DQUOT_USR_SUSPENDED;
1469 else
1470 dqopt->flags &= ~DQUOT_USR_SUSPENDED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 break;
1472 case GRPQUOTA:
1473 dqopt->flags &= ~DQUOT_GRP_ENABLED;
Jan Kara0ff5af82008-04-28 02:14:33 -07001474 if (remount)
1475 dqopt->flags |= DQUOT_GRP_SUSPENDED;
1476 else
1477 dqopt->flags &= ~DQUOT_GRP_SUSPENDED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 break;
1479 }
1480}
1481
Jan Kara0ff5af82008-04-28 02:14:33 -07001482
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483/*
1484 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1485 */
Jan Kara0ff5af82008-04-28 02:14:33 -07001486int vfs_quota_off(struct super_block *sb, int type, int remount)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487{
Jan Kara0ff5af82008-04-28 02:14:33 -07001488 int cnt, ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489 struct quota_info *dqopt = sb_dqopt(sb);
1490 struct inode *toputinode[MAXQUOTAS];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491
1492 /* We need to serialize quota_off() for device */
Ingo Molnard3be9152006-03-23 03:00:29 -08001493 mutex_lock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1495 toputinode[cnt] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496 if (type != -1 && cnt != type)
1497 continue;
Jan Kara0ff5af82008-04-28 02:14:33 -07001498 /* If we keep inodes of quota files after remount and quotaoff
1499 * is called, drop kept inodes. */
1500 if (!remount && sb_has_quota_suspended(sb, cnt)) {
1501 iput(dqopt->files[cnt]);
1502 dqopt->files[cnt] = NULL;
1503 reset_enable_flags(dqopt, cnt, 0);
1504 continue;
1505 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506 if (!sb_has_quota_enabled(sb, cnt))
1507 continue;
Jan Kara0ff5af82008-04-28 02:14:33 -07001508 reset_enable_flags(dqopt, cnt, remount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509
1510 /* Note: these are blocking operations */
1511 drop_dquot_ref(sb, cnt);
1512 invalidate_dquots(sb, cnt);
1513 /*
1514 * Now all dquots should be invalidated, all writes done so we should be only
1515 * users of the info. No locks needed.
1516 */
1517 if (info_dirty(&dqopt->info[cnt]))
1518 sb->dq_op->write_info(sb, cnt);
1519 if (dqopt->ops[cnt]->free_file_info)
1520 dqopt->ops[cnt]->free_file_info(sb, cnt);
1521 put_quota_format(dqopt->info[cnt].dqi_format);
1522
1523 toputinode[cnt] = dqopt->files[cnt];
Jan Kara0ff5af82008-04-28 02:14:33 -07001524 if (!remount)
1525 dqopt->files[cnt] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 dqopt->info[cnt].dqi_flags = 0;
1527 dqopt->info[cnt].dqi_igrace = 0;
1528 dqopt->info[cnt].dqi_bgrace = 0;
1529 dqopt->ops[cnt] = NULL;
1530 }
Ingo Molnard3be9152006-03-23 03:00:29 -08001531 mutex_unlock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 /* Sync the superblock so that buffers with quota data are written to
Al Viro7b7b1ac2005-11-07 17:13:39 -05001533 * disk (and so userspace sees correct data afterwards). */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534 if (sb->s_op->sync_fs)
1535 sb->s_op->sync_fs(sb, 1);
1536 sync_blockdev(sb->s_bdev);
1537 /* Now the quota files are just ordinary files and we can set the
1538 * inode flags back. Moreover we discard the pagecache so that
1539 * userspace sees the writes we did bypassing the pagecache. We
1540 * must also discard the blockdev buffers so that we see the
1541 * changes done by userspace on the next quotaon() */
1542 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1543 if (toputinode[cnt]) {
Ingo Molnard3be9152006-03-23 03:00:29 -08001544 mutex_lock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 /* If quota was reenabled in the meantime, we have
1546 * nothing to do */
1547 if (!sb_has_quota_enabled(sb, cnt)) {
Jan Kara79254092007-05-16 22:11:19 -07001548 mutex_lock_nested(&toputinode[cnt]->i_mutex, I_MUTEX_QUOTA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
1550 S_NOATIME | S_NOQUOTA);
1551 truncate_inode_pages(&toputinode[cnt]->i_data, 0);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001552 mutex_unlock(&toputinode[cnt]->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553 mark_inode_dirty(toputinode[cnt]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 }
Ingo Molnard3be9152006-03-23 03:00:29 -08001555 mutex_unlock(&dqopt->dqonoff_mutex);
Jan Kara0ff5af82008-04-28 02:14:33 -07001556 /* On remount RO, we keep the inode pointer so that we
1557 * can reenable quota on the subsequent remount RW.
1558 * But we have better not keep inode pointer when there
1559 * is pending delete on the quota file... */
1560 if (!remount)
1561 iput(toputinode[cnt]);
1562 else if (!toputinode[cnt]->i_nlink)
1563 ret = -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564 }
1565 if (sb->s_bdev)
Peter Zijlstraf98393a2007-05-06 14:49:54 -07001566 invalidate_bdev(sb->s_bdev);
Jan Kara0ff5af82008-04-28 02:14:33 -07001567 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568}
1569
1570/*
1571 * Turn quotas on on a device
1572 */
1573
1574/* Helper function when we already have the inode */
1575static int vfs_quota_on_inode(struct inode *inode, int type, int format_id)
1576{
1577 struct quota_format_type *fmt = find_quota_format(format_id);
1578 struct super_block *sb = inode->i_sb;
1579 struct quota_info *dqopt = sb_dqopt(sb);
1580 int error;
1581 int oldflags = -1;
1582
1583 if (!fmt)
1584 return -ESRCH;
1585 if (!S_ISREG(inode->i_mode)) {
1586 error = -EACCES;
1587 goto out_fmt;
1588 }
1589 if (IS_RDONLY(inode)) {
1590 error = -EROFS;
1591 goto out_fmt;
1592 }
1593 if (!sb->s_op->quota_write || !sb->s_op->quota_read) {
1594 error = -EINVAL;
1595 goto out_fmt;
1596 }
1597
1598 /* As we bypass the pagecache we must now flush the inode so that
1599 * we see all the changes from userspace... */
1600 write_inode_now(inode, 1);
1601 /* And now flush the block cache so that kernel sees the changes */
Peter Zijlstraf98393a2007-05-06 14:49:54 -07001602 invalidate_bdev(sb->s_bdev);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001603 mutex_lock(&inode->i_mutex);
Ingo Molnard3be9152006-03-23 03:00:29 -08001604 mutex_lock(&dqopt->dqonoff_mutex);
Jan Kara0ff5af82008-04-28 02:14:33 -07001605 if (sb_has_quota_enabled(sb, type) ||
1606 sb_has_quota_suspended(sb, type)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607 error = -EBUSY;
1608 goto out_lock;
1609 }
1610 /* We don't want quota and atime on quota files (deadlocks possible)
1611 * Also nobody should write to the file - we use special IO operations
1612 * which ignore the immutable bit. */
1613 down_write(&dqopt->dqptr_sem);
1614 oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | S_NOQUOTA);
1615 inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
1616 up_write(&dqopt->dqptr_sem);
Jan Kara31e7ad62005-04-16 15:25:46 -07001617 sb->dq_op->drop(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618
1619 error = -EIO;
1620 dqopt->files[type] = igrab(inode);
1621 if (!dqopt->files[type])
1622 goto out_lock;
1623 error = -EINVAL;
1624 if (!fmt->qf_ops->check_quota_file(sb, type))
1625 goto out_file_init;
1626
1627 dqopt->ops[type] = fmt->qf_ops;
1628 dqopt->info[type].dqi_format = fmt;
Jan Kara0ff5af82008-04-28 02:14:33 -07001629 dqopt->info[type].dqi_fmt_id = format_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
Ingo Molnard3be9152006-03-23 03:00:29 -08001631 mutex_lock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632 if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) {
Ingo Molnard3be9152006-03-23 03:00:29 -08001633 mutex_unlock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 goto out_file_init;
1635 }
Ingo Molnard3be9152006-03-23 03:00:29 -08001636 mutex_unlock(&dqopt->dqio_mutex);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001637 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638 set_enable_flags(dqopt, type);
1639
1640 add_dquot_ref(sb, type);
Ingo Molnard3be9152006-03-23 03:00:29 -08001641 mutex_unlock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642
1643 return 0;
1644
1645out_file_init:
1646 dqopt->files[type] = NULL;
1647 iput(inode);
1648out_lock:
Ingo Molnard3be9152006-03-23 03:00:29 -08001649 mutex_unlock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650 if (oldflags != -1) {
1651 down_write(&dqopt->dqptr_sem);
1652 /* Set the flags back (in the case of accidental quotaon()
1653 * on a wrong file we don't want to mess up the flags) */
1654 inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
1655 inode->i_flags |= oldflags;
1656 up_write(&dqopt->dqptr_sem);
1657 }
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001658 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659out_fmt:
1660 put_quota_format(fmt);
1661
1662 return error;
1663}
1664
Jan Kara0ff5af82008-04-28 02:14:33 -07001665/* Reenable quotas on remount RW */
1666static int vfs_quota_on_remount(struct super_block *sb, int type)
1667{
1668 struct quota_info *dqopt = sb_dqopt(sb);
1669 struct inode *inode;
1670 int ret;
1671
1672 mutex_lock(&dqopt->dqonoff_mutex);
1673 if (!sb_has_quota_suspended(sb, type)) {
1674 mutex_unlock(&dqopt->dqonoff_mutex);
1675 return 0;
1676 }
1677 BUG_ON(sb_has_quota_enabled(sb, type));
1678
1679 inode = dqopt->files[type];
1680 dqopt->files[type] = NULL;
1681 reset_enable_flags(dqopt, type, 0);
1682 mutex_unlock(&dqopt->dqonoff_mutex);
1683
1684 ret = vfs_quota_on_inode(inode, type, dqopt->info[type].dqi_fmt_id);
1685 iput(inode);
1686
1687 return ret;
1688}
1689
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690/* Actual function called from quotactl() */
Jan Kara0ff5af82008-04-28 02:14:33 -07001691int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path,
1692 int remount)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693{
1694 struct nameidata nd;
1695 int error;
1696
Jan Kara0ff5af82008-04-28 02:14:33 -07001697 if (remount)
1698 return vfs_quota_on_remount(sb, type);
1699
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 error = path_lookup(path, LOOKUP_FOLLOW, &nd);
1701 if (error < 0)
1702 return error;
Jan Blunck4ac91372008-02-14 19:34:32 -08001703 error = security_quota_on(nd.path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704 if (error)
1705 goto out_path;
1706 /* Quota file not on the same filesystem? */
Jan Blunck4ac91372008-02-14 19:34:32 -08001707 if (nd.path.mnt->mnt_sb != sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708 error = -EXDEV;
Al Viro7b7b1ac2005-11-07 17:13:39 -05001709 else
Jan Blunck4ac91372008-02-14 19:34:32 -08001710 error = vfs_quota_on_inode(nd.path.dentry->d_inode, type,
1711 format_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712out_path:
Jan Blunck1d957f92008-02-14 19:34:35 -08001713 path_put(&nd.path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714 return error;
1715}
1716
1717/*
1718 * This function is used when filesystem needs to initialize quotas
1719 * during mount time.
1720 */
Christoph Hellwig84de8562005-06-23 00:09:16 -07001721int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
1722 int format_id, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723{
Christoph Hellwig84de8562005-06-23 00:09:16 -07001724 struct dentry *dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 int error;
1726
Christoph Hellwig2fa389c2005-06-23 00:09:16 -07001727 dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
Christoph Hellwig84de8562005-06-23 00:09:16 -07001728 if (IS_ERR(dentry))
1729 return PTR_ERR(dentry);
1730
Jan Kara154f4842005-11-28 13:44:14 -08001731 if (!dentry->d_inode) {
1732 error = -ENOENT;
1733 goto out;
1734 }
1735
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736 error = security_quota_on(dentry);
Christoph Hellwig84de8562005-06-23 00:09:16 -07001737 if (!error)
1738 error = vfs_quota_on_inode(dentry->d_inode, type, format_id);
1739
Jan Kara154f4842005-11-28 13:44:14 -08001740out:
Christoph Hellwig84de8562005-06-23 00:09:16 -07001741 dput(dentry);
1742 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743}
1744
1745/* Generic routine for getting common part of quota structure */
1746static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di)
1747{
1748 struct mem_dqblk *dm = &dquot->dq_dqb;
1749
1750 spin_lock(&dq_data_lock);
1751 di->dqb_bhardlimit = dm->dqb_bhardlimit;
1752 di->dqb_bsoftlimit = dm->dqb_bsoftlimit;
1753 di->dqb_curspace = dm->dqb_curspace;
1754 di->dqb_ihardlimit = dm->dqb_ihardlimit;
1755 di->dqb_isoftlimit = dm->dqb_isoftlimit;
1756 di->dqb_curinodes = dm->dqb_curinodes;
1757 di->dqb_btime = dm->dqb_btime;
1758 di->dqb_itime = dm->dqb_itime;
1759 di->dqb_valid = QIF_ALL;
1760 spin_unlock(&dq_data_lock);
1761}
1762
1763int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
1764{
1765 struct dquot *dquot;
1766
Ingo Molnard3be9152006-03-23 03:00:29 -08001767 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768 if (!(dquot = dqget(sb, id, type))) {
Ingo Molnard3be9152006-03-23 03:00:29 -08001769 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770 return -ESRCH;
1771 }
1772 do_get_dqblk(dquot, di);
1773 dqput(dquot);
Ingo Molnard3be9152006-03-23 03:00:29 -08001774 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001775 return 0;
1776}
1777
1778/* Generic routine for setting common part of quota structure */
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07001779static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780{
1781 struct mem_dqblk *dm = &dquot->dq_dqb;
1782 int check_blim = 0, check_ilim = 0;
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07001783 struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
1784
1785 if ((di->dqb_valid & QIF_BLIMITS &&
1786 (di->dqb_bhardlimit > dqi->dqi_maxblimit ||
1787 di->dqb_bsoftlimit > dqi->dqi_maxblimit)) ||
1788 (di->dqb_valid & QIF_ILIMITS &&
1789 (di->dqb_ihardlimit > dqi->dqi_maxilimit ||
1790 di->dqb_isoftlimit > dqi->dqi_maxilimit)))
1791 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792
1793 spin_lock(&dq_data_lock);
1794 if (di->dqb_valid & QIF_SPACE) {
1795 dm->dqb_curspace = di->dqb_curspace;
1796 check_blim = 1;
1797 }
1798 if (di->dqb_valid & QIF_BLIMITS) {
1799 dm->dqb_bsoftlimit = di->dqb_bsoftlimit;
1800 dm->dqb_bhardlimit = di->dqb_bhardlimit;
1801 check_blim = 1;
1802 }
1803 if (di->dqb_valid & QIF_INODES) {
1804 dm->dqb_curinodes = di->dqb_curinodes;
1805 check_ilim = 1;
1806 }
1807 if (di->dqb_valid & QIF_ILIMITS) {
1808 dm->dqb_isoftlimit = di->dqb_isoftlimit;
1809 dm->dqb_ihardlimit = di->dqb_ihardlimit;
1810 check_ilim = 1;
1811 }
1812 if (di->dqb_valid & QIF_BTIME)
1813 dm->dqb_btime = di->dqb_btime;
1814 if (di->dqb_valid & QIF_ITIME)
1815 dm->dqb_itime = di->dqb_itime;
1816
1817 if (check_blim) {
1818 if (!dm->dqb_bsoftlimit || toqb(dm->dqb_curspace) < dm->dqb_bsoftlimit) {
1819 dm->dqb_btime = 0;
1820 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
1821 }
1822 else if (!(di->dqb_valid & QIF_BTIME)) /* Set grace only if user hasn't provided his own... */
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07001823 dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824 }
1825 if (check_ilim) {
1826 if (!dm->dqb_isoftlimit || dm->dqb_curinodes < dm->dqb_isoftlimit) {
1827 dm->dqb_itime = 0;
1828 clear_bit(DQ_INODES_B, &dquot->dq_flags);
1829 }
1830 else if (!(di->dqb_valid & QIF_ITIME)) /* Set grace only if user hasn't provided his own... */
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07001831 dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832 }
1833 if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || dm->dqb_isoftlimit)
1834 clear_bit(DQ_FAKE_B, &dquot->dq_flags);
1835 else
1836 set_bit(DQ_FAKE_B, &dquot->dq_flags);
1837 spin_unlock(&dq_data_lock);
1838 mark_dquot_dirty(dquot);
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07001839
1840 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841}
1842
1843int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
1844{
1845 struct dquot *dquot;
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07001846 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847
Ingo Molnard3be9152006-03-23 03:00:29 -08001848 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849 if (!(dquot = dqget(sb, id, type))) {
Ingo Molnard3be9152006-03-23 03:00:29 -08001850 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 return -ESRCH;
1852 }
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07001853 rc = do_set_dqblk(dquot, di);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854 dqput(dquot);
Ingo Molnard3be9152006-03-23 03:00:29 -08001855 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07001856 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857}
1858
1859/* Generic routine for getting common part of quota file information */
1860int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
1861{
1862 struct mem_dqinfo *mi;
1863
Ingo Molnard3be9152006-03-23 03:00:29 -08001864 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865 if (!sb_has_quota_enabled(sb, type)) {
Ingo Molnard3be9152006-03-23 03:00:29 -08001866 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867 return -ESRCH;
1868 }
1869 mi = sb_dqopt(sb)->info + type;
1870 spin_lock(&dq_data_lock);
1871 ii->dqi_bgrace = mi->dqi_bgrace;
1872 ii->dqi_igrace = mi->dqi_igrace;
1873 ii->dqi_flags = mi->dqi_flags & DQF_MASK;
1874 ii->dqi_valid = IIF_ALL;
1875 spin_unlock(&dq_data_lock);
Ingo Molnard3be9152006-03-23 03:00:29 -08001876 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877 return 0;
1878}
1879
1880/* Generic routine for setting common part of quota file information */
1881int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
1882{
1883 struct mem_dqinfo *mi;
1884
Ingo Molnard3be9152006-03-23 03:00:29 -08001885 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001886 if (!sb_has_quota_enabled(sb, type)) {
Ingo Molnard3be9152006-03-23 03:00:29 -08001887 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888 return -ESRCH;
1889 }
1890 mi = sb_dqopt(sb)->info + type;
1891 spin_lock(&dq_data_lock);
1892 if (ii->dqi_valid & IIF_BGRACE)
1893 mi->dqi_bgrace = ii->dqi_bgrace;
1894 if (ii->dqi_valid & IIF_IGRACE)
1895 mi->dqi_igrace = ii->dqi_igrace;
1896 if (ii->dqi_valid & IIF_FLAGS)
1897 mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | (ii->dqi_flags & DQF_MASK);
1898 spin_unlock(&dq_data_lock);
1899 mark_info_dirty(sb, type);
1900 /* Force write to disk */
1901 sb->dq_op->write_info(sb, type);
Ingo Molnard3be9152006-03-23 03:00:29 -08001902 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001903 return 0;
1904}
1905
1906struct quotactl_ops vfs_quotactl_ops = {
1907 .quota_on = vfs_quota_on,
1908 .quota_off = vfs_quota_off,
1909 .quota_sync = vfs_quota_sync,
1910 .get_info = vfs_get_dqinfo,
1911 .set_info = vfs_set_dqinfo,
1912 .get_dqblk = vfs_get_dqblk,
1913 .set_dqblk = vfs_set_dqblk
1914};
1915
1916static ctl_table fs_dqstats_table[] = {
1917 {
1918 .ctl_name = FS_DQ_LOOKUPS,
1919 .procname = "lookups",
1920 .data = &dqstats.lookups,
1921 .maxlen = sizeof(int),
1922 .mode = 0444,
1923 .proc_handler = &proc_dointvec,
1924 },
1925 {
1926 .ctl_name = FS_DQ_DROPS,
1927 .procname = "drops",
1928 .data = &dqstats.drops,
1929 .maxlen = sizeof(int),
1930 .mode = 0444,
1931 .proc_handler = &proc_dointvec,
1932 },
1933 {
1934 .ctl_name = FS_DQ_READS,
1935 .procname = "reads",
1936 .data = &dqstats.reads,
1937 .maxlen = sizeof(int),
1938 .mode = 0444,
1939 .proc_handler = &proc_dointvec,
1940 },
1941 {
1942 .ctl_name = FS_DQ_WRITES,
1943 .procname = "writes",
1944 .data = &dqstats.writes,
1945 .maxlen = sizeof(int),
1946 .mode = 0444,
1947 .proc_handler = &proc_dointvec,
1948 },
1949 {
1950 .ctl_name = FS_DQ_CACHE_HITS,
1951 .procname = "cache_hits",
1952 .data = &dqstats.cache_hits,
1953 .maxlen = sizeof(int),
1954 .mode = 0444,
1955 .proc_handler = &proc_dointvec,
1956 },
1957 {
1958 .ctl_name = FS_DQ_ALLOCATED,
1959 .procname = "allocated_dquots",
1960 .data = &dqstats.allocated_dquots,
1961 .maxlen = sizeof(int),
1962 .mode = 0444,
1963 .proc_handler = &proc_dointvec,
1964 },
1965 {
1966 .ctl_name = FS_DQ_FREE,
1967 .procname = "free_dquots",
1968 .data = &dqstats.free_dquots,
1969 .maxlen = sizeof(int),
1970 .mode = 0444,
1971 .proc_handler = &proc_dointvec,
1972 },
1973 {
1974 .ctl_name = FS_DQ_SYNCS,
1975 .procname = "syncs",
1976 .data = &dqstats.syncs,
1977 .maxlen = sizeof(int),
1978 .mode = 0444,
1979 .proc_handler = &proc_dointvec,
1980 },
Jan Kara8e893462007-10-16 23:29:31 -07001981#ifdef CONFIG_PRINT_QUOTA_WARNING
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982 {
1983 .ctl_name = FS_DQ_WARNINGS,
1984 .procname = "warnings",
1985 .data = &flag_print_warnings,
1986 .maxlen = sizeof(int),
1987 .mode = 0644,
1988 .proc_handler = &proc_dointvec,
1989 },
Jan Kara8e893462007-10-16 23:29:31 -07001990#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001991 { .ctl_name = 0 },
1992};
1993
1994static ctl_table fs_table[] = {
1995 {
1996 .ctl_name = FS_DQSTATS,
1997 .procname = "quota",
1998 .mode = 0555,
1999 .child = fs_dqstats_table,
2000 },
2001 { .ctl_name = 0 },
2002};
2003
2004static ctl_table sys_table[] = {
2005 {
2006 .ctl_name = CTL_FS,
2007 .procname = "fs",
2008 .mode = 0555,
2009 .child = fs_table,
2010 },
2011 { .ctl_name = 0 },
2012};
2013
2014static int __init dquot_init(void)
2015{
2016 int i;
2017 unsigned long nr_hash, order;
2018
2019 printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
2020
Eric W. Biederman0b4d4142007-02-14 00:34:09 -08002021 register_sysctl_table(sys_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022
Paul Mundt20c2df82007-07-20 10:11:58 +09002023 dquot_cachep = kmem_cache_create("dquot",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002024 sizeof(struct dquot), sizeof(unsigned long) * 4,
Paul Jacksonfffb60f2006-03-24 03:16:06 -08002025 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
2026 SLAB_MEM_SPREAD|SLAB_PANIC),
Paul Mundt20c2df82007-07-20 10:11:58 +09002027 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028
2029 order = 0;
2030 dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
2031 if (!dquot_hash)
2032 panic("Cannot create dquot hash table");
2033
2034 /* Find power-of-two hlist_heads which can fit into allocation */
2035 nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
2036 dq_hash_bits = 0;
2037 do {
2038 dq_hash_bits++;
2039 } while (nr_hash >> dq_hash_bits);
2040 dq_hash_bits--;
2041
2042 nr_hash = 1UL << dq_hash_bits;
2043 dq_hash_mask = nr_hash - 1;
2044 for (i = 0; i < nr_hash; i++)
2045 INIT_HLIST_HEAD(dquot_hash + i);
2046
2047 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2048 nr_hash, order, (PAGE_SIZE << order));
2049
Rusty Russell8e1f9362007-07-17 04:03:17 -07002050 register_shrinker(&dqcache_shrinker);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051
Jan Kara8e893462007-10-16 23:29:31 -07002052#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
2053 if (genl_register_family(&quota_genl_family) != 0)
2054 printk(KERN_ERR "VFS: Failed to create quota netlink interface.\n");
2055#endif
2056
Linus Torvalds1da177e2005-04-16 15:20:36 -07002057 return 0;
2058}
2059module_init(dquot_init);
2060
2061EXPORT_SYMBOL(register_quota_format);
2062EXPORT_SYMBOL(unregister_quota_format);
2063EXPORT_SYMBOL(dqstats);
2064EXPORT_SYMBOL(dq_data_lock);
2065EXPORT_SYMBOL(vfs_quota_on);
2066EXPORT_SYMBOL(vfs_quota_on_mount);
2067EXPORT_SYMBOL(vfs_quota_off);
2068EXPORT_SYMBOL(vfs_quota_sync);
2069EXPORT_SYMBOL(vfs_get_dqinfo);
2070EXPORT_SYMBOL(vfs_set_dqinfo);
2071EXPORT_SYMBOL(vfs_get_dqblk);
2072EXPORT_SYMBOL(vfs_set_dqblk);
2073EXPORT_SYMBOL(dquot_commit);
2074EXPORT_SYMBOL(dquot_commit_info);
2075EXPORT_SYMBOL(dquot_acquire);
2076EXPORT_SYMBOL(dquot_release);
2077EXPORT_SYMBOL(dquot_mark_dquot_dirty);
2078EXPORT_SYMBOL(dquot_initialize);
2079EXPORT_SYMBOL(dquot_drop);
2080EXPORT_SYMBOL(dquot_alloc_space);
2081EXPORT_SYMBOL(dquot_alloc_inode);
2082EXPORT_SYMBOL(dquot_free_space);
2083EXPORT_SYMBOL(dquot_free_inode);
2084EXPORT_SYMBOL(dquot_transfer);