blob: 5e95261005b2ac68f2103ae7468f257c57ba89da [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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * Author: Marco van Wieringen <mvw@planets.elm.net>
13 *
14 * Fixes: Dmitry Gorodchanin <pgmdsg@ibi.com>, 11 Feb 96
15 *
16 * Revised list management to avoid races
17 * -- Bill Hawes, <whawes@star.net>, 9/98
18 *
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
26 * quota files
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
31 *
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
39 *
40 * Added dynamic quota structure allocation
41 * Jan Kara <jack@suse.cz> 12/2000
42 *
43 * Rewritten quota interface. Implemented new quota format and
44 * formats registering.
45 * Jan Kara, <jack@suse.cz>, 2001,2002
46 *
47 * New SMP locking.
48 * Jan Kara, <jack@suse.cz>, 10/2002
49 *
50 * Added journalled quota support, fix lock inversion problems
51 * Jan Kara, <jack@suse.cz>, 2003,2004
52 *
53 * (C) Copyright 1994 - 1997 Marco van Wieringen
54 */
55
56#include <linux/errno.h>
57#include <linux/kernel.h>
58#include <linux/fs.h>
59#include <linux/mount.h>
60#include <linux/mm.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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#include <linux/init.h>
71#include <linux/module.h>
72#include <linux/proc_fs.h>
73#include <linux/security.h>
74#include <linux/kmod.h>
75#include <linux/namei.h>
76#include <linux/buffer_head.h>
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080077#include <linux/capability.h>
Adrian Bunkbe586ba2005-11-07 00:59:35 -080078#include <linux/quotaops.h>
Christoph Hellwigfb58b732007-02-12 00:51:57 -080079#include <linux/writeback.h> /* for inode_lock, oddly enough.. */
Jan Kara8e893462007-10-16 23:29:31 -070080#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
81#include <net/netlink.h>
82#include <net/genetlink.h>
83#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
85#include <asm/uaccess.h>
86
87#define __DQUOT_PARANOIA
88
89/*
90 * There are two quota SMP locks. dq_list_lock protects all lists with quotas
91 * and quota formats and also dqstats structure containing statistics about the
92 * lists. dq_data_lock protects data from dq_dqb and also mem_dqinfo structures
93 * and also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
94 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
95 * in inode_add_bytes() and inode_sub_bytes().
96 *
97 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock
98 *
99 * Note that some things (eg. sb pointer, type, id) doesn't change during
100 * the life of the dquot structure and so needn't to be protected by a lock
101 *
102 * Any operation working on dquots via inode pointers must hold dqptr_sem. If
103 * operation is just reading pointers from inode (or not using them at all) the
104 * read lock is enough. If pointers are altered function must hold write lock
105 * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800106 * for altering the flag i_mutex is also needed). If operation is holding
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 * reference to dquot in other way (e.g. quotactl ops) it must be guarded by
Ingo Molnard3be9152006-03-23 03:00:29 -0800108 * dqonoff_mutex.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 * This locking assures that:
110 * a) update/access to dquot pointers in inode is serialized
111 * b) everyone is guarded against invalidate_dquots()
112 *
Ingo Molnard3be9152006-03-23 03:00:29 -0800113 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
115 * Currently dquot is locked only when it is being read to memory (or space for
116 * it is being allocated) on the first dqget() and when it is being released on
117 * the last dqput(). The allocation and release oparations are serialized by
118 * the dq_lock and by checking the use count in dquot_release(). Write
119 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
120 * spinlock to internal buffers before writing.
121 *
122 * Lock ordering (including related VFS locks) is the following:
Ingo Molnard3be9152006-03-23 03:00:29 -0800123 * i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
124 * dqio_mutex
125 * i_mutex on quota files is special (it's below dqio_mutex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 */
127
128static DEFINE_SPINLOCK(dq_list_lock);
129DEFINE_SPINLOCK(dq_data_lock);
130
131static char *quotatypes[] = INITQFNAMES;
132static struct quota_format_type *quota_formats; /* List of registered formats */
133static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES;
134
135/* SLAB cache for dquot structures */
Christoph Lametere18b8902006-12-06 20:33:20 -0800136static struct kmem_cache *dquot_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
138int register_quota_format(struct quota_format_type *fmt)
139{
140 spin_lock(&dq_list_lock);
141 fmt->qf_next = quota_formats;
142 quota_formats = fmt;
143 spin_unlock(&dq_list_lock);
144 return 0;
145}
146
147void unregister_quota_format(struct quota_format_type *fmt)
148{
149 struct quota_format_type **actqf;
150
151 spin_lock(&dq_list_lock);
152 for (actqf = &quota_formats; *actqf && *actqf != fmt; actqf = &(*actqf)->qf_next);
153 if (*actqf)
154 *actqf = (*actqf)->qf_next;
155 spin_unlock(&dq_list_lock);
156}
157
158static struct quota_format_type *find_quota_format(int id)
159{
160 struct quota_format_type *actqf;
161
162 spin_lock(&dq_list_lock);
163 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
164 if (!actqf || !try_module_get(actqf->qf_owner)) {
165 int qm;
166
167 spin_unlock(&dq_list_lock);
168
169 for (qm = 0; module_names[qm].qm_fmt_id && module_names[qm].qm_fmt_id != id; qm++);
170 if (!module_names[qm].qm_fmt_id || request_module(module_names[qm].qm_mod_name))
171 return NULL;
172
173 spin_lock(&dq_list_lock);
174 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id; actqf = actqf->qf_next);
175 if (actqf && !try_module_get(actqf->qf_owner))
176 actqf = NULL;
177 }
178 spin_unlock(&dq_list_lock);
179 return actqf;
180}
181
182static void put_quota_format(struct quota_format_type *fmt)
183{
184 module_put(fmt->qf_owner);
185}
186
187/*
188 * Dquot List Management:
189 * The quota code uses three lists for dquot management: the inuse_list,
190 * free_dquots, and dquot_hash[] array. A single dquot structure may be
191 * on all three lists, depending on its current state.
192 *
193 * All dquots are placed to the end of inuse_list when first created, and this
194 * list is used for invalidate operation, which must look at every dquot.
195 *
196 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
197 * and this list is searched whenever we need an available dquot. Dquots are
198 * removed from the list as soon as they are used again, and
199 * dqstats.free_dquots gives the number of dquots on the list. When
200 * dquot is invalidated it's completely released from memory.
201 *
202 * Dquots with a specific identity (device, type and id) are placed on
203 * one of the dquot_hash[] hash chains. The provides an efficient search
204 * mechanism to locate a specific dquot.
205 */
206
207static LIST_HEAD(inuse_list);
208static LIST_HEAD(free_dquots);
209static unsigned int dq_hash_bits, dq_hash_mask;
210static struct hlist_head *dquot_hash;
211
212struct dqstats dqstats;
213
214static void dqput(struct dquot *dquot);
215
216static inline unsigned int
217hashfn(const struct super_block *sb, unsigned int id, int type)
218{
219 unsigned long tmp;
220
221 tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
222 return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
223}
224
225/*
226 * Following list functions expect dq_list_lock to be held
227 */
228static inline void insert_dquot_hash(struct dquot *dquot)
229{
230 struct hlist_head *head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id, dquot->dq_type);
231 hlist_add_head(&dquot->dq_hash, head);
232}
233
234static inline void remove_dquot_hash(struct dquot *dquot)
235{
236 hlist_del_init(&dquot->dq_hash);
237}
238
239static inline struct dquot *find_dquot(unsigned int hashent, struct super_block *sb, unsigned int id, int type)
240{
241 struct hlist_node *node;
242 struct dquot *dquot;
243
244 hlist_for_each (node, dquot_hash+hashent) {
245 dquot = hlist_entry(node, struct dquot, dq_hash);
246 if (dquot->dq_sb == sb && dquot->dq_id == id && dquot->dq_type == type)
247 return dquot;
248 }
249 return NODQUOT;
250}
251
252/* Add a dquot to the tail of the free list */
253static inline void put_dquot_last(struct dquot *dquot)
254{
Akinobu Mita8e130592006-06-26 00:24:37 -0700255 list_add_tail(&dquot->dq_free, &free_dquots);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 dqstats.free_dquots++;
257}
258
259static inline void remove_free_dquot(struct dquot *dquot)
260{
261 if (list_empty(&dquot->dq_free))
262 return;
263 list_del_init(&dquot->dq_free);
264 dqstats.free_dquots--;
265}
266
267static inline void put_inuse(struct dquot *dquot)
268{
269 /* We add to the back of inuse list so we don't have to restart
270 * when traversing this list and we block */
Akinobu Mita8e130592006-06-26 00:24:37 -0700271 list_add_tail(&dquot->dq_inuse, &inuse_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 dqstats.allocated_dquots++;
273}
274
275static inline void remove_inuse(struct dquot *dquot)
276{
277 dqstats.allocated_dquots--;
278 list_del(&dquot->dq_inuse);
279}
280/*
281 * End of list functions needing dq_list_lock
282 */
283
284static void wait_on_dquot(struct dquot *dquot)
285{
Ingo Molnard3be9152006-03-23 03:00:29 -0800286 mutex_lock(&dquot->dq_lock);
287 mutex_unlock(&dquot->dq_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288}
289
Jan Kara03f6e922008-04-28 02:14:32 -0700290static inline int dquot_dirty(struct dquot *dquot)
291{
292 return test_bit(DQ_MOD_B, &dquot->dq_flags);
293}
294
295static inline int mark_dquot_dirty(struct dquot *dquot)
296{
297 return dquot->dq_sb->dq_op->mark_dirty(dquot);
298}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300int dquot_mark_dquot_dirty(struct dquot *dquot)
301{
302 spin_lock(&dq_list_lock);
303 if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags))
304 list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
305 info[dquot->dq_type].dqi_dirty_list);
306 spin_unlock(&dq_list_lock);
307 return 0;
308}
309
310/* This function needs dq_list_lock */
311static inline int clear_dquot_dirty(struct dquot *dquot)
312{
313 if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
314 return 0;
315 list_del_init(&dquot->dq_dirty);
316 return 1;
317}
318
319void mark_info_dirty(struct super_block *sb, int type)
320{
321 set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
322}
323EXPORT_SYMBOL(mark_info_dirty);
324
325/*
326 * Read dquot from disk and alloc space for it
327 */
328
329int dquot_acquire(struct dquot *dquot)
330{
331 int ret = 0, ret2 = 0;
332 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
333
Ingo Molnard3be9152006-03-23 03:00:29 -0800334 mutex_lock(&dquot->dq_lock);
335 mutex_lock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 if (!test_bit(DQ_READ_B, &dquot->dq_flags))
337 ret = dqopt->ops[dquot->dq_type]->read_dqblk(dquot);
338 if (ret < 0)
339 goto out_iolock;
340 set_bit(DQ_READ_B, &dquot->dq_flags);
341 /* Instantiate dquot if needed */
342 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
343 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
344 /* Write the info if needed */
345 if (info_dirty(&dqopt->info[dquot->dq_type]))
346 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
347 if (ret < 0)
348 goto out_iolock;
349 if (ret2 < 0) {
350 ret = ret2;
351 goto out_iolock;
352 }
353 }
354 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
355out_iolock:
Ingo Molnard3be9152006-03-23 03:00:29 -0800356 mutex_unlock(&dqopt->dqio_mutex);
357 mutex_unlock(&dquot->dq_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 return ret;
359}
360
361/*
362 * Write dquot to disk
363 */
364int dquot_commit(struct dquot *dquot)
365{
366 int ret = 0, ret2 = 0;
367 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
368
Ingo Molnard3be9152006-03-23 03:00:29 -0800369 mutex_lock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 spin_lock(&dq_list_lock);
371 if (!clear_dquot_dirty(dquot)) {
372 spin_unlock(&dq_list_lock);
373 goto out_sem;
374 }
375 spin_unlock(&dq_list_lock);
376 /* Inactive dquot can be only if there was error during read/init
377 * => we have better not writing it */
378 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
379 ret = dqopt->ops[dquot->dq_type]->commit_dqblk(dquot);
380 if (info_dirty(&dqopt->info[dquot->dq_type]))
381 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
382 if (ret >= 0)
383 ret = ret2;
384 }
385out_sem:
Ingo Molnard3be9152006-03-23 03:00:29 -0800386 mutex_unlock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 return ret;
388}
389
390/*
391 * Release dquot
392 */
393int dquot_release(struct dquot *dquot)
394{
395 int ret = 0, ret2 = 0;
396 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
397
Ingo Molnard3be9152006-03-23 03:00:29 -0800398 mutex_lock(&dquot->dq_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 /* Check whether we are not racing with some other dqget() */
400 if (atomic_read(&dquot->dq_count) > 1)
401 goto out_dqlock;
Ingo Molnard3be9152006-03-23 03:00:29 -0800402 mutex_lock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 if (dqopt->ops[dquot->dq_type]->release_dqblk) {
404 ret = dqopt->ops[dquot->dq_type]->release_dqblk(dquot);
405 /* Write the info */
406 if (info_dirty(&dqopt->info[dquot->dq_type]))
407 ret2 = dqopt->ops[dquot->dq_type]->write_file_info(dquot->dq_sb, dquot->dq_type);
408 if (ret >= 0)
409 ret = ret2;
410 }
411 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
Ingo Molnard3be9152006-03-23 03:00:29 -0800412 mutex_unlock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413out_dqlock:
Ingo Molnard3be9152006-03-23 03:00:29 -0800414 mutex_unlock(&dquot->dq_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 return ret;
416}
417
418/* Invalidate all dquots on the list. Note that this function is called after
419 * quota is disabled and pointers from inodes removed so there cannot be new
Jan Kara6362e4d2006-03-23 03:00:17 -0800420 * quota users. There can still be some users of quotas due to inodes being
421 * just deleted or pruned by prune_icache() (those are not attached to any
422 * list). We have to wait for such users.
423 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424static void invalidate_dquots(struct super_block *sb, int type)
425{
Domen Puncerc33ed272005-06-25 14:59:36 -0700426 struct dquot *dquot, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Jan Kara6362e4d2006-03-23 03:00:17 -0800428restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 spin_lock(&dq_list_lock);
Domen Puncerc33ed272005-06-25 14:59:36 -0700430 list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 if (dquot->dq_sb != sb)
432 continue;
433 if (dquot->dq_type != type)
434 continue;
Jan Kara6362e4d2006-03-23 03:00:17 -0800435 /* Wait for dquot users */
436 if (atomic_read(&dquot->dq_count)) {
437 DEFINE_WAIT(wait);
438
439 atomic_inc(&dquot->dq_count);
440 prepare_to_wait(&dquot->dq_wait_unused, &wait,
441 TASK_UNINTERRUPTIBLE);
442 spin_unlock(&dq_list_lock);
443 /* Once dqput() wakes us up, we know it's time to free
444 * the dquot.
445 * IMPORTANT: we rely on the fact that there is always
446 * at most one process waiting for dquot to free.
447 * Otherwise dq_count would be > 1 and we would never
448 * wake up.
449 */
450 if (atomic_read(&dquot->dq_count) > 1)
451 schedule();
452 finish_wait(&dquot->dq_wait_unused, &wait);
453 dqput(dquot);
454 /* At this moment dquot() need not exist (it could be
455 * reclaimed by prune_dqcache(). Hence we must
456 * restart. */
457 goto restart;
458 }
459 /*
460 * Quota now has no users and it has been written on last
461 * dqput()
462 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 remove_dquot_hash(dquot);
464 remove_free_dquot(dquot);
465 remove_inuse(dquot);
466 kmem_cache_free(dquot_cachep, dquot);
467 }
468 spin_unlock(&dq_list_lock);
469}
470
471int vfs_quota_sync(struct super_block *sb, int type)
472{
473 struct list_head *dirty;
474 struct dquot *dquot;
475 struct quota_info *dqopt = sb_dqopt(sb);
476 int cnt;
477
Ingo Molnard3be9152006-03-23 03:00:29 -0800478 mutex_lock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
480 if (type != -1 && cnt != type)
481 continue;
482 if (!sb_has_quota_enabled(sb, cnt))
483 continue;
484 spin_lock(&dq_list_lock);
485 dirty = &dqopt->info[cnt].dqi_dirty_list;
486 while (!list_empty(dirty)) {
Pavel Emelianovb5e61812007-05-08 00:30:19 -0700487 dquot = list_first_entry(dirty, struct dquot, dq_dirty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 /* Dirty and inactive can be only bad dquot... */
489 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
490 clear_dquot_dirty(dquot);
491 continue;
492 }
493 /* Now we have active dquot from which someone is
494 * holding reference so we can safely just increase
495 * use count */
496 atomic_inc(&dquot->dq_count);
497 dqstats.lookups++;
498 spin_unlock(&dq_list_lock);
499 sb->dq_op->write_dquot(dquot);
500 dqput(dquot);
501 spin_lock(&dq_list_lock);
502 }
503 spin_unlock(&dq_list_lock);
504 }
505
506 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
507 if ((cnt == type || type == -1) && sb_has_quota_enabled(sb, cnt)
508 && info_dirty(&dqopt->info[cnt]))
509 sb->dq_op->write_info(sb, cnt);
510 spin_lock(&dq_list_lock);
511 dqstats.syncs++;
512 spin_unlock(&dq_list_lock);
Ingo Molnard3be9152006-03-23 03:00:29 -0800513 mutex_unlock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
515 return 0;
516}
517
518/* Free unused dquots from cache */
519static void prune_dqcache(int count)
520{
521 struct list_head *head;
522 struct dquot *dquot;
523
524 head = free_dquots.prev;
525 while (head != &free_dquots && count) {
526 dquot = list_entry(head, struct dquot, dq_free);
527 remove_dquot_hash(dquot);
528 remove_free_dquot(dquot);
529 remove_inuse(dquot);
530 kmem_cache_free(dquot_cachep, dquot);
531 count--;
532 head = free_dquots.prev;
533 }
534}
535
536/*
537 * This is called from kswapd when we think we need some
538 * more memory
539 */
540
Al Viro27496a82005-10-21 03:20:48 -0400541static int shrink_dqcache_memory(int nr, gfp_t gfp_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542{
543 if (nr) {
544 spin_lock(&dq_list_lock);
545 prune_dqcache(nr);
546 spin_unlock(&dq_list_lock);
547 }
548 return (dqstats.free_dquots / 100) * sysctl_vfs_cache_pressure;
549}
550
Rusty Russell8e1f9362007-07-17 04:03:17 -0700551static struct shrinker dqcache_shrinker = {
552 .shrink = shrink_dqcache_memory,
553 .seeks = DEFAULT_SEEKS,
554};
555
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556/*
557 * Put reference to dquot
558 * NOTE: If you change this function please check whether dqput_blocks() works right...
Ingo Molnard3be9152006-03-23 03:00:29 -0800559 * MUST be called with either dqptr_sem or dqonoff_mutex held
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 */
561static void dqput(struct dquot *dquot)
562{
Jan Karab48d3802008-07-25 01:46:49 -0700563 int ret;
564
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 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 */
Jan Karab48d3802008-07-25 01:46:49 -0700597 ret = dquot->dq_sb->dq_op->write_dquot(dquot);
598 if (ret < 0) {
599 printk(KERN_ERR "VFS: cannot write quota structure on "
600 "device %s (error %d). Quota may get out of "
601 "sync!\n", dquot->dq_sb->s_id, ret);
602 /*
603 * We clear dirty bit anyway, so that we avoid
604 * infinite loop here
605 */
606 spin_lock(&dq_list_lock);
607 clear_dquot_dirty(dquot);
608 spin_unlock(&dq_list_lock);
609 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 goto we_slept;
611 }
612 /* Clear flag in case dquot was inactive (something bad happened) */
613 clear_dquot_dirty(dquot);
614 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
615 spin_unlock(&dq_list_lock);
616 dquot->dq_sb->dq_op->release_dquot(dquot);
617 goto we_slept;
618 }
619 atomic_dec(&dquot->dq_count);
620#ifdef __DQUOT_PARANOIA
621 /* sanity check */
Eric Sesterhenn8abf6a42006-04-02 13:36:13 +0200622 BUG_ON(!list_empty(&dquot->dq_free));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623#endif
624 put_dquot_last(dquot);
625 spin_unlock(&dq_list_lock);
626}
627
628static struct dquot *get_empty_dquot(struct super_block *sb, int type)
629{
630 struct dquot *dquot;
631
Robert P. J. Dayc3762222007-02-10 01:45:03 -0800632 dquot = kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 if(!dquot)
634 return NODQUOT;
635
Ingo Molnard3be9152006-03-23 03:00:29 -0800636 mutex_init(&dquot->dq_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 INIT_LIST_HEAD(&dquot->dq_free);
638 INIT_LIST_HEAD(&dquot->dq_inuse);
639 INIT_HLIST_NODE(&dquot->dq_hash);
640 INIT_LIST_HEAD(&dquot->dq_dirty);
Jan Kara6362e4d2006-03-23 03:00:17 -0800641 init_waitqueue_head(&dquot->dq_wait_unused);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 dquot->dq_sb = sb;
643 dquot->dq_type = type;
644 atomic_set(&dquot->dq_count, 1);
645
646 return dquot;
647}
648
649/*
650 * Get reference to dquot
Ingo Molnard3be9152006-03-23 03:00:29 -0800651 * MUST be called with either dqptr_sem or dqonoff_mutex held
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 */
653static struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
654{
655 unsigned int hashent = hashfn(sb, id, type);
656 struct dquot *dquot, *empty = NODQUOT;
657
658 if (!sb_has_quota_enabled(sb, type))
659 return NODQUOT;
660we_slept:
661 spin_lock(&dq_list_lock);
662 if ((dquot = find_dquot(hashent, sb, id, type)) == NODQUOT) {
663 if (empty == NODQUOT) {
664 spin_unlock(&dq_list_lock);
665 if ((empty = get_empty_dquot(sb, type)) == NODQUOT)
666 schedule(); /* Try to wait for a moment... */
667 goto we_slept;
668 }
669 dquot = empty;
670 dquot->dq_id = id;
671 /* all dquots go on the inuse_list */
672 put_inuse(dquot);
673 /* hash it first so it can be found */
674 insert_dquot_hash(dquot);
675 dqstats.lookups++;
676 spin_unlock(&dq_list_lock);
677 } else {
678 if (!atomic_read(&dquot->dq_count))
679 remove_free_dquot(dquot);
680 atomic_inc(&dquot->dq_count);
681 dqstats.cache_hits++;
682 dqstats.lookups++;
683 spin_unlock(&dq_list_lock);
684 if (empty)
685 kmem_cache_free(dquot_cachep, empty);
686 }
687 /* Wait for dq_lock - after this we know that either dquot_release() is already
688 * finished or it will be canceled due to dq_count > 1 test */
689 wait_on_dquot(dquot);
690 /* Read the dquot and instantiate it (everything done only if needed) */
691 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && sb->dq_op->acquire_dquot(dquot) < 0) {
692 dqput(dquot);
693 return NODQUOT;
694 }
695#ifdef __DQUOT_PARANOIA
Eric Sesterhenn8abf6a42006-04-02 13:36:13 +0200696 BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697#endif
698
699 return dquot;
700}
701
702static int dqinit_needed(struct inode *inode, int type)
703{
704 int cnt;
705
706 if (IS_NOQUOTA(inode))
707 return 0;
708 if (type != -1)
709 return inode->i_dquot[type] == NODQUOT;
710 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
711 if (inode->i_dquot[cnt] == NODQUOT)
712 return 1;
713 return 0;
714}
715
Ingo Molnard3be9152006-03-23 03:00:29 -0800716/* This routine is guarded by dqonoff_mutex mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717static void add_dquot_ref(struct super_block *sb, int type)
718{
Jan Kara941d2382008-02-06 01:37:36 -0800719 struct inode *inode, *old_inode = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
Christoph Hellwigd003fb72007-02-12 00:51:58 -0800721 spin_lock(&inode_lock);
722 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
723 if (!atomic_read(&inode->i_writecount))
724 continue;
725 if (!dqinit_needed(inode, type))
726 continue;
727 if (inode->i_state & (I_FREEING|I_WILL_FREE))
728 continue;
729
730 __iget(inode);
731 spin_unlock(&inode_lock);
732
Jan Kara941d2382008-02-06 01:37:36 -0800733 iput(old_inode);
Christoph Hellwigd003fb72007-02-12 00:51:58 -0800734 sb->dq_op->initialize(inode, type);
Jan Kara941d2382008-02-06 01:37:36 -0800735 /* We hold a reference to 'inode' so it couldn't have been
736 * removed from s_inodes list while we dropped the inode_lock.
737 * We cannot iput the inode now as we can be holding the last
738 * reference and we cannot iput it under inode_lock. So we
739 * keep the reference and iput it later. */
740 old_inode = inode;
741 spin_lock(&inode_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 }
Christoph Hellwigd003fb72007-02-12 00:51:58 -0800743 spin_unlock(&inode_lock);
Jan Kara941d2382008-02-06 01:37:36 -0800744 iput(old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745}
746
747/* Return 0 if dqput() won't block (note that 1 doesn't necessarily mean blocking) */
748static inline int dqput_blocks(struct dquot *dquot)
749{
750 if (atomic_read(&dquot->dq_count) <= 1)
751 return 1;
752 return 0;
753}
754
755/* Remove references to dquots from inode - add dquot to list for freeing if needed */
756/* We can't race with anybody because we hold dqptr_sem for writing... */
Adrian Bunke5f00f42007-05-08 00:27:22 -0700757static int remove_inode_dquot_ref(struct inode *inode, int type,
758 struct list_head *tofree_head)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759{
760 struct dquot *dquot = inode->i_dquot[type];
761
762 inode->i_dquot[type] = NODQUOT;
763 if (dquot != NODQUOT) {
764 if (dqput_blocks(dquot)) {
765#ifdef __DQUOT_PARANOIA
766 if (atomic_read(&dquot->dq_count) != 1)
767 printk(KERN_WARNING "VFS: Adding dquot with dq_count %d to dispose list.\n", atomic_read(&dquot->dq_count));
768#endif
769 spin_lock(&dq_list_lock);
770 list_add(&dquot->dq_free, tofree_head); /* As dquot must have currently users it can't be on the free list... */
771 spin_unlock(&dq_list_lock);
772 return 1;
773 }
774 else
775 dqput(dquot); /* We have guaranteed we won't block */
776 }
777 return 0;
778}
779
780/* Free list of dquots - called from inode.c */
781/* dquots are removed from inodes, no new references can be got so we are the only ones holding reference */
782static void put_dquot_list(struct list_head *tofree_head)
783{
784 struct list_head *act_head;
785 struct dquot *dquot;
786
787 act_head = tofree_head->next;
788 /* So now we have dquots on the list... Just free them */
789 while (act_head != tofree_head) {
790 dquot = list_entry(act_head, struct dquot, dq_free);
791 act_head = act_head->next;
792 list_del_init(&dquot->dq_free); /* Remove dquot from the list so we won't have problems... */
793 dqput(dquot);
794 }
795}
796
Christoph Hellwigfb58b732007-02-12 00:51:57 -0800797static void remove_dquot_ref(struct super_block *sb, int type,
798 struct list_head *tofree_head)
799{
800 struct inode *inode;
801
802 spin_lock(&inode_lock);
803 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
804 if (!IS_NOQUOTA(inode))
805 remove_inode_dquot_ref(inode, type, tofree_head);
806 }
807 spin_unlock(&inode_lock);
808}
809
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810/* Gather all references from inodes and drop them */
811static void drop_dquot_ref(struct super_block *sb, int type)
812{
813 LIST_HEAD(tofree_head);
814
Christoph Hellwigfb58b732007-02-12 00:51:57 -0800815 if (sb->dq_op) {
816 down_write(&sb_dqopt(sb)->dqptr_sem);
817 remove_dquot_ref(sb, type, &tofree_head);
818 up_write(&sb_dqopt(sb)->dqptr_sem);
819 put_dquot_list(&tofree_head);
820 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821}
822
823static inline void dquot_incr_inodes(struct dquot *dquot, unsigned long number)
824{
825 dquot->dq_dqb.dqb_curinodes += number;
826}
827
828static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
829{
830 dquot->dq_dqb.dqb_curspace += number;
831}
832
833static inline void dquot_decr_inodes(struct dquot *dquot, unsigned long number)
834{
835 if (dquot->dq_dqb.dqb_curinodes > number)
836 dquot->dq_dqb.dqb_curinodes -= number;
837 else
838 dquot->dq_dqb.dqb_curinodes = 0;
839 if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
840 dquot->dq_dqb.dqb_itime = (time_t) 0;
841 clear_bit(DQ_INODES_B, &dquot->dq_flags);
842}
843
844static inline void dquot_decr_space(struct dquot *dquot, qsize_t number)
845{
846 if (dquot->dq_dqb.dqb_curspace > number)
847 dquot->dq_dqb.dqb_curspace -= number;
848 else
849 dquot->dq_dqb.dqb_curspace = 0;
850 if (toqb(dquot->dq_dqb.dqb_curspace) <= dquot->dq_dqb.dqb_bsoftlimit)
851 dquot->dq_dqb.dqb_btime = (time_t) 0;
852 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
853}
854
Jan Karac5254602007-12-22 14:03:25 -0800855static int warning_issued(struct dquot *dquot, const int warntype)
856{
857 int flag = (warntype == QUOTA_NL_BHARDWARN ||
858 warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
859 ((warntype == QUOTA_NL_IHARDWARN ||
860 warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
861
862 if (!flag)
863 return 0;
864 return test_and_set_bit(flag, &dquot->dq_flags);
865}
866
Jan Kara8e893462007-10-16 23:29:31 -0700867#ifdef CONFIG_PRINT_QUOTA_WARNING
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868static int flag_print_warnings = 1;
869
870static inline int need_print_warning(struct dquot *dquot)
871{
872 if (!flag_print_warnings)
873 return 0;
874
875 switch (dquot->dq_type) {
876 case USRQUOTA:
877 return current->fsuid == dquot->dq_id;
878 case GRPQUOTA:
879 return in_group_p(dquot->dq_id);
880 }
881 return 0;
882}
883
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884/* Print warning to user which exceeded quota */
Jan Karac5254602007-12-22 14:03:25 -0800885static void print_warning(struct dquot *dquot, const int warntype)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886{
887 char *msg = NULL;
Peter Zijlstra24ec8392006-12-08 02:36:04 -0800888 struct tty_struct *tty;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
Jan Kara657d3bf2008-07-25 01:46:52 -0700890 if (warntype == QUOTA_NL_IHARDBELOW ||
891 warntype == QUOTA_NL_ISOFTBELOW ||
892 warntype == QUOTA_NL_BHARDBELOW ||
893 warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(dquot))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 return;
895
Peter Zijlstra24ec8392006-12-08 02:36:04 -0800896 tty = get_current_tty();
897 if (!tty)
Alan Cox452a00d2008-10-13 10:39:13 +0100898 return;
Peter Zijlstra24ec8392006-12-08 02:36:04 -0800899 tty_write_message(tty, dquot->dq_sb->s_id);
Jan Kara8e893462007-10-16 23:29:31 -0700900 if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
Peter Zijlstra24ec8392006-12-08 02:36:04 -0800901 tty_write_message(tty, ": warning, ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 else
Peter Zijlstra24ec8392006-12-08 02:36:04 -0800903 tty_write_message(tty, ": write failed, ");
904 tty_write_message(tty, quotatypes[dquot->dq_type]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 switch (warntype) {
Jan Kara8e893462007-10-16 23:29:31 -0700906 case QUOTA_NL_IHARDWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 msg = " file limit reached.\r\n";
908 break;
Jan Kara8e893462007-10-16 23:29:31 -0700909 case QUOTA_NL_ISOFTLONGWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 msg = " file quota exceeded too long.\r\n";
911 break;
Jan Kara8e893462007-10-16 23:29:31 -0700912 case QUOTA_NL_ISOFTWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 msg = " file quota exceeded.\r\n";
914 break;
Jan Kara8e893462007-10-16 23:29:31 -0700915 case QUOTA_NL_BHARDWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 msg = " block limit reached.\r\n";
917 break;
Jan Kara8e893462007-10-16 23:29:31 -0700918 case QUOTA_NL_BSOFTLONGWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 msg = " block quota exceeded too long.\r\n";
920 break;
Jan Kara8e893462007-10-16 23:29:31 -0700921 case QUOTA_NL_BSOFTWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 msg = " block quota exceeded.\r\n";
923 break;
924 }
Peter Zijlstra24ec8392006-12-08 02:36:04 -0800925 tty_write_message(tty, msg);
Alan Cox452a00d2008-10-13 10:39:13 +0100926 tty_kref_put(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927}
Jan Kara8e893462007-10-16 23:29:31 -0700928#endif
929
930#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
931
Jan Kara8e893462007-10-16 23:29:31 -0700932/* Netlink family structure for quota */
933static struct genl_family quota_genl_family = {
934 .id = GENL_ID_GENERATE,
935 .hdrsize = 0,
936 .name = "VFS_DQUOT",
937 .version = 1,
938 .maxattr = QUOTA_NL_A_MAX,
939};
940
941/* Send warning to userspace about user which exceeded quota */
942static void send_warning(const struct dquot *dquot, const char warntype)
943{
944 static atomic_t seq;
945 struct sk_buff *skb;
946 void *msg_head;
947 int ret;
Jan Kara22dd4832007-12-22 14:03:25 -0800948 int msg_size = 4 * nla_total_size(sizeof(u32)) +
949 2 * nla_total_size(sizeof(u64));
Jan Kara8e893462007-10-16 23:29:31 -0700950
951 /* We have to allocate using GFP_NOFS as we are called from a
952 * filesystem performing write and thus further recursion into
953 * the fs to free some data could cause deadlocks. */
Jan Kara22dd4832007-12-22 14:03:25 -0800954 skb = genlmsg_new(msg_size, GFP_NOFS);
Jan Kara8e893462007-10-16 23:29:31 -0700955 if (!skb) {
956 printk(KERN_ERR
957 "VFS: Not enough memory to send quota warning.\n");
958 return;
959 }
960 msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq),
961 &quota_genl_family, 0, QUOTA_NL_C_WARNING);
962 if (!msg_head) {
963 printk(KERN_ERR
964 "VFS: Cannot store netlink header in quota warning.\n");
965 goto err_out;
966 }
967 ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, dquot->dq_type);
968 if (ret)
969 goto attr_err_out;
970 ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, dquot->dq_id);
971 if (ret)
972 goto attr_err_out;
973 ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype);
974 if (ret)
975 goto attr_err_out;
976 ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR,
977 MAJOR(dquot->dq_sb->s_dev));
978 if (ret)
979 goto attr_err_out;
980 ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR,
981 MINOR(dquot->dq_sb->s_dev));
982 if (ret)
983 goto attr_err_out;
984 ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current->user->uid);
985 if (ret)
986 goto attr_err_out;
987 genlmsg_end(skb, msg_head);
988
989 ret = genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS);
990 if (ret < 0 && ret != -ESRCH)
991 printk(KERN_ERR
992 "VFS: Failed to send notification message: %d\n", ret);
993 return;
994attr_err_out:
Jan Kara22dd4832007-12-22 14:03:25 -0800995 printk(KERN_ERR "VFS: Not enough space to compose quota message!\n");
Jan Kara8e893462007-10-16 23:29:31 -0700996err_out:
997 kfree_skb(skb);
998}
999#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000
Jan Kara087ee8d2007-12-17 16:20:26 -08001001static inline void flush_warnings(struct dquot * const *dquots, char *warntype)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002{
1003 int i;
1004
1005 for (i = 0; i < MAXQUOTAS; i++)
Jan Karac5254602007-12-22 14:03:25 -08001006 if (dquots[i] != NODQUOT && warntype[i] != QUOTA_NL_NOWARN &&
1007 !warning_issued(dquots[i], warntype[i])) {
Jan Kara8e893462007-10-16 23:29:31 -07001008#ifdef CONFIG_PRINT_QUOTA_WARNING
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 print_warning(dquots[i], warntype[i]);
Jan Kara8e893462007-10-16 23:29:31 -07001010#endif
1011#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
1012 send_warning(dquots[i], warntype[i]);
1013#endif
1014 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015}
1016
1017static inline char ignore_hardlimit(struct dquot *dquot)
1018{
1019 struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
1020
1021 return capable(CAP_SYS_RESOURCE) &&
1022 (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD || !(info->dqi_flags & V1_DQF_RSQUASH));
1023}
1024
1025/* needs dq_data_lock */
1026static int check_idq(struct dquot *dquot, ulong inodes, char *warntype)
1027{
Jan Kara8e893462007-10-16 23:29:31 -07001028 *warntype = QUOTA_NL_NOWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 if (inodes <= 0 || test_bit(DQ_FAKE_B, &dquot->dq_flags))
1030 return QUOTA_OK;
1031
1032 if (dquot->dq_dqb.dqb_ihardlimit &&
1033 (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_ihardlimit &&
1034 !ignore_hardlimit(dquot)) {
Jan Kara8e893462007-10-16 23:29:31 -07001035 *warntype = QUOTA_NL_IHARDWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 return NO_QUOTA;
1037 }
1038
1039 if (dquot->dq_dqb.dqb_isoftlimit &&
1040 (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit &&
1041 dquot->dq_dqb.dqb_itime && get_seconds() >= dquot->dq_dqb.dqb_itime &&
1042 !ignore_hardlimit(dquot)) {
Jan Kara8e893462007-10-16 23:29:31 -07001043 *warntype = QUOTA_NL_ISOFTLONGWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 return NO_QUOTA;
1045 }
1046
1047 if (dquot->dq_dqb.dqb_isoftlimit &&
1048 (dquot->dq_dqb.dqb_curinodes + inodes) > dquot->dq_dqb.dqb_isoftlimit &&
1049 dquot->dq_dqb.dqb_itime == 0) {
Jan Kara8e893462007-10-16 23:29:31 -07001050 *warntype = QUOTA_NL_ISOFTWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 dquot->dq_dqb.dqb_itime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_igrace;
1052 }
1053
1054 return QUOTA_OK;
1055}
1056
1057/* needs dq_data_lock */
1058static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype)
1059{
Jan Kara8e893462007-10-16 23:29:31 -07001060 *warntype = QUOTA_NL_NOWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 if (space <= 0 || test_bit(DQ_FAKE_B, &dquot->dq_flags))
1062 return QUOTA_OK;
1063
1064 if (dquot->dq_dqb.dqb_bhardlimit &&
1065 toqb(dquot->dq_dqb.dqb_curspace + space) > dquot->dq_dqb.dqb_bhardlimit &&
1066 !ignore_hardlimit(dquot)) {
1067 if (!prealloc)
Jan Kara8e893462007-10-16 23:29:31 -07001068 *warntype = QUOTA_NL_BHARDWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 return NO_QUOTA;
1070 }
1071
1072 if (dquot->dq_dqb.dqb_bsoftlimit &&
1073 toqb(dquot->dq_dqb.dqb_curspace + space) > dquot->dq_dqb.dqb_bsoftlimit &&
1074 dquot->dq_dqb.dqb_btime && get_seconds() >= dquot->dq_dqb.dqb_btime &&
1075 !ignore_hardlimit(dquot)) {
1076 if (!prealloc)
Jan Kara8e893462007-10-16 23:29:31 -07001077 *warntype = QUOTA_NL_BSOFTLONGWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 return NO_QUOTA;
1079 }
1080
1081 if (dquot->dq_dqb.dqb_bsoftlimit &&
1082 toqb(dquot->dq_dqb.dqb_curspace + space) > dquot->dq_dqb.dqb_bsoftlimit &&
1083 dquot->dq_dqb.dqb_btime == 0) {
1084 if (!prealloc) {
Jan Kara8e893462007-10-16 23:29:31 -07001085 *warntype = QUOTA_NL_BSOFTWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 dquot->dq_dqb.dqb_btime = get_seconds() + sb_dqopt(dquot->dq_sb)->info[dquot->dq_type].dqi_bgrace;
1087 }
1088 else
1089 /*
1090 * We don't allow preallocation to exceed softlimit so exceeding will
1091 * be always printed
1092 */
1093 return NO_QUOTA;
1094 }
1095
1096 return QUOTA_OK;
1097}
1098
Jan Kara657d3bf2008-07-25 01:46:52 -07001099static int info_idq_free(struct dquot *dquot, ulong inodes)
1100{
1101 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1102 dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
1103 return QUOTA_NL_NOWARN;
1104
1105 if (dquot->dq_dqb.dqb_curinodes - inodes <= dquot->dq_dqb.dqb_isoftlimit)
1106 return QUOTA_NL_ISOFTBELOW;
1107 if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
1108 dquot->dq_dqb.dqb_curinodes - inodes < dquot->dq_dqb.dqb_ihardlimit)
1109 return QUOTA_NL_IHARDBELOW;
1110 return QUOTA_NL_NOWARN;
1111}
1112
1113static int info_bdq_free(struct dquot *dquot, qsize_t space)
1114{
1115 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
1116 toqb(dquot->dq_dqb.dqb_curspace) <= dquot->dq_dqb.dqb_bsoftlimit)
1117 return QUOTA_NL_NOWARN;
1118
1119 if (toqb(dquot->dq_dqb.dqb_curspace - space) <=
1120 dquot->dq_dqb.dqb_bsoftlimit)
1121 return QUOTA_NL_BSOFTBELOW;
1122 if (toqb(dquot->dq_dqb.dqb_curspace) >= dquot->dq_dqb.dqb_bhardlimit &&
1123 toqb(dquot->dq_dqb.dqb_curspace - space) <
1124 dquot->dq_dqb.dqb_bhardlimit)
1125 return QUOTA_NL_BHARDBELOW;
1126 return QUOTA_NL_NOWARN;
1127}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128/*
1129 * Initialize quota pointers in inode
1130 * Transaction must be started at entry
1131 */
1132int dquot_initialize(struct inode *inode, int type)
1133{
1134 unsigned int id = 0;
1135 int cnt, ret = 0;
1136
Ingo Molnard3be9152006-03-23 03:00:29 -08001137 /* First test before acquiring mutex - solves deadlocks when we
1138 * re-enter the quota code and are already holding the mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 if (IS_NOQUOTA(inode))
1140 return 0;
1141 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1142 /* Having dqptr_sem we know NOQUOTA flags can't be altered... */
1143 if (IS_NOQUOTA(inode))
1144 goto out_err;
1145 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1146 if (type != -1 && cnt != type)
1147 continue;
1148 if (inode->i_dquot[cnt] == NODQUOT) {
1149 switch (cnt) {
1150 case USRQUOTA:
1151 id = inode->i_uid;
1152 break;
1153 case GRPQUOTA:
1154 id = inode->i_gid;
1155 break;
1156 }
1157 inode->i_dquot[cnt] = dqget(inode->i_sb, id, cnt);
1158 }
1159 }
1160out_err:
1161 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1162 return ret;
1163}
1164
1165/*
1166 * Release all quotas referenced by inode
1167 * Transaction must be started at an entry
1168 */
1169int dquot_drop(struct inode *inode)
1170{
1171 int cnt;
1172
1173 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1174 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1175 if (inode->i_dquot[cnt] != NODQUOT) {
1176 dqput(inode->i_dquot[cnt]);
1177 inode->i_dquot[cnt] = NODQUOT;
1178 }
1179 }
1180 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1181 return 0;
1182}
1183
Jan Karab85f4b82008-07-25 01:46:50 -07001184/* Wrapper to remove references to quota structures from inode */
1185void vfs_dq_drop(struct inode *inode)
1186{
1187 /* Here we can get arbitrary inode from clear_inode() so we have
1188 * to be careful. OTOH we don't need locking as quota operations
1189 * are allowed to change only at mount time */
1190 if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op
1191 && inode->i_sb->dq_op->drop) {
1192 int cnt;
1193 /* Test before calling to rule out calls from proc and such
1194 * where we are not allowed to block. Note that this is
1195 * actually reliable test even without the lock - the caller
1196 * must assure that nobody can come after the DQUOT_DROP and
1197 * add quota pointers back anyway */
1198 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1199 if (inode->i_dquot[cnt] != NODQUOT)
1200 break;
1201 if (cnt < MAXQUOTAS)
1202 inode->i_sb->dq_op->drop(inode);
1203 }
1204}
1205
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206/*
1207 * Following four functions update i_blocks+i_bytes fields and
1208 * quota information (together with appropriate checks)
1209 * NOTE: We absolutely rely on the fact that caller dirties
1210 * the inode (usually macros in quotaops.h care about this) and
1211 * holds a handle for the current transaction so that dquot write and
1212 * inode write go into the same transaction.
1213 */
1214
1215/*
1216 * This operation can block, but only after everything is updated
1217 */
1218int dquot_alloc_space(struct inode *inode, qsize_t number, int warn)
1219{
1220 int cnt, ret = NO_QUOTA;
1221 char warntype[MAXQUOTAS];
1222
Ingo Molnard3be9152006-03-23 03:00:29 -08001223 /* First test before acquiring mutex - solves deadlocks when we
1224 * re-enter the quota code and are already holding the mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 if (IS_NOQUOTA(inode)) {
1226out_add:
1227 inode_add_bytes(inode, number);
1228 return QUOTA_OK;
1229 }
1230 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
Jan Kara8e893462007-10-16 23:29:31 -07001231 warntype[cnt] = QUOTA_NL_NOWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232
1233 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1234 if (IS_NOQUOTA(inode)) { /* Now we can do reliable test... */
1235 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1236 goto out_add;
1237 }
1238 spin_lock(&dq_data_lock);
1239 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1240 if (inode->i_dquot[cnt] == NODQUOT)
1241 continue;
1242 if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) == NO_QUOTA)
1243 goto warn_put_all;
1244 }
1245 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1246 if (inode->i_dquot[cnt] == NODQUOT)
1247 continue;
1248 dquot_incr_space(inode->i_dquot[cnt], number);
1249 }
1250 inode_add_bytes(inode, number);
1251 ret = QUOTA_OK;
1252warn_put_all:
1253 spin_unlock(&dq_data_lock);
1254 if (ret == QUOTA_OK)
1255 /* Dirtify all the dquots - this can block when journalling */
1256 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1257 if (inode->i_dquot[cnt])
1258 mark_dquot_dirty(inode->i_dquot[cnt]);
1259 flush_warnings(inode->i_dquot, warntype);
1260 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1261 return ret;
1262}
1263
1264/*
1265 * This operation can block, but only after everything is updated
1266 */
1267int dquot_alloc_inode(const struct inode *inode, unsigned long number)
1268{
1269 int cnt, ret = NO_QUOTA;
1270 char warntype[MAXQUOTAS];
1271
Ingo Molnard3be9152006-03-23 03:00:29 -08001272 /* First test before acquiring mutex - solves deadlocks when we
1273 * re-enter the quota code and are already holding the mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 if (IS_NOQUOTA(inode))
1275 return QUOTA_OK;
1276 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
Jan Kara8e893462007-10-16 23:29:31 -07001277 warntype[cnt] = QUOTA_NL_NOWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1279 if (IS_NOQUOTA(inode)) {
1280 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1281 return QUOTA_OK;
1282 }
1283 spin_lock(&dq_data_lock);
1284 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1285 if (inode->i_dquot[cnt] == NODQUOT)
1286 continue;
1287 if (check_idq(inode->i_dquot[cnt], number, warntype+cnt) == NO_QUOTA)
1288 goto warn_put_all;
1289 }
1290
1291 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1292 if (inode->i_dquot[cnt] == NODQUOT)
1293 continue;
1294 dquot_incr_inodes(inode->i_dquot[cnt], number);
1295 }
1296 ret = QUOTA_OK;
1297warn_put_all:
1298 spin_unlock(&dq_data_lock);
1299 if (ret == QUOTA_OK)
1300 /* Dirtify all the dquots - this can block when journalling */
1301 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1302 if (inode->i_dquot[cnt])
1303 mark_dquot_dirty(inode->i_dquot[cnt]);
Jan Kara087ee8d2007-12-17 16:20:26 -08001304 flush_warnings(inode->i_dquot, warntype);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1306 return ret;
1307}
1308
1309/*
1310 * This operation can block, but only after everything is updated
1311 */
1312int dquot_free_space(struct inode *inode, qsize_t number)
1313{
1314 unsigned int cnt;
Jan Kara657d3bf2008-07-25 01:46:52 -07001315 char warntype[MAXQUOTAS];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316
Ingo Molnard3be9152006-03-23 03:00:29 -08001317 /* First test before acquiring mutex - solves deadlocks when we
1318 * re-enter the quota code and are already holding the mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 if (IS_NOQUOTA(inode)) {
1320out_sub:
1321 inode_sub_bytes(inode, number);
1322 return QUOTA_OK;
1323 }
Jan Kara657d3bf2008-07-25 01:46:52 -07001324
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1326 /* Now recheck reliably when holding dqptr_sem */
1327 if (IS_NOQUOTA(inode)) {
1328 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1329 goto out_sub;
1330 }
1331 spin_lock(&dq_data_lock);
1332 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1333 if (inode->i_dquot[cnt] == NODQUOT)
1334 continue;
Jan Kara657d3bf2008-07-25 01:46:52 -07001335 warntype[cnt] = info_bdq_free(inode->i_dquot[cnt], number);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 dquot_decr_space(inode->i_dquot[cnt], number);
1337 }
1338 inode_sub_bytes(inode, number);
1339 spin_unlock(&dq_data_lock);
1340 /* Dirtify all the dquots - this can block when journalling */
1341 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1342 if (inode->i_dquot[cnt])
1343 mark_dquot_dirty(inode->i_dquot[cnt]);
Jan Kara657d3bf2008-07-25 01:46:52 -07001344 flush_warnings(inode->i_dquot, warntype);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1346 return QUOTA_OK;
1347}
1348
1349/*
1350 * This operation can block, but only after everything is updated
1351 */
1352int dquot_free_inode(const struct inode *inode, unsigned long number)
1353{
1354 unsigned int cnt;
Jan Kara657d3bf2008-07-25 01:46:52 -07001355 char warntype[MAXQUOTAS];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356
Ingo Molnard3be9152006-03-23 03:00:29 -08001357 /* First test before acquiring mutex - solves deadlocks when we
1358 * re-enter the quota code and are already holding the mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 if (IS_NOQUOTA(inode))
1360 return QUOTA_OK;
Jan Kara657d3bf2008-07-25 01:46:52 -07001361
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1363 /* Now recheck reliably when holding dqptr_sem */
1364 if (IS_NOQUOTA(inode)) {
1365 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1366 return QUOTA_OK;
1367 }
1368 spin_lock(&dq_data_lock);
1369 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1370 if (inode->i_dquot[cnt] == NODQUOT)
1371 continue;
Jan Kara657d3bf2008-07-25 01:46:52 -07001372 warntype[cnt] = info_idq_free(inode->i_dquot[cnt], number);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 dquot_decr_inodes(inode->i_dquot[cnt], number);
1374 }
1375 spin_unlock(&dq_data_lock);
1376 /* Dirtify all the dquots - this can block when journalling */
1377 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1378 if (inode->i_dquot[cnt])
1379 mark_dquot_dirty(inode->i_dquot[cnt]);
Jan Kara657d3bf2008-07-25 01:46:52 -07001380 flush_warnings(inode->i_dquot, warntype);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
1382 return QUOTA_OK;
1383}
1384
1385/*
1386 * Transfer the number of inode and blocks from one diskquota to an other.
1387 *
1388 * This operation can block, but only after everything is updated
1389 * A transaction must be started when entering this function.
1390 */
1391int dquot_transfer(struct inode *inode, struct iattr *iattr)
1392{
1393 qsize_t space;
1394 struct dquot *transfer_from[MAXQUOTAS];
1395 struct dquot *transfer_to[MAXQUOTAS];
1396 int cnt, ret = NO_QUOTA, chuid = (iattr->ia_valid & ATTR_UID) && inode->i_uid != iattr->ia_uid,
1397 chgid = (iattr->ia_valid & ATTR_GID) && inode->i_gid != iattr->ia_gid;
Jan Kara657d3bf2008-07-25 01:46:52 -07001398 char warntype_to[MAXQUOTAS];
1399 char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400
Ingo Molnard3be9152006-03-23 03:00:29 -08001401 /* First test before acquiring mutex - solves deadlocks when we
1402 * re-enter the quota code and are already holding the mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 if (IS_NOQUOTA(inode))
1404 return QUOTA_OK;
1405 /* Clear the arrays */
1406 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1407 transfer_to[cnt] = transfer_from[cnt] = NODQUOT;
Jan Kara657d3bf2008-07-25 01:46:52 -07001408 warntype_to[cnt] = QUOTA_NL_NOWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 }
1410 down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1411 /* Now recheck reliably when holding dqptr_sem */
1412 if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
1413 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1414 return QUOTA_OK;
1415 }
1416 /* First build the transfer_to list - here we can block on
1417 * reading/instantiating of dquots. We know that the transaction for
1418 * us was already started so we don't violate lock ranking here */
1419 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1420 switch (cnt) {
1421 case USRQUOTA:
1422 if (!chuid)
1423 continue;
1424 transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_uid, cnt);
1425 break;
1426 case GRPQUOTA:
1427 if (!chgid)
1428 continue;
1429 transfer_to[cnt] = dqget(inode->i_sb, iattr->ia_gid, cnt);
1430 break;
1431 }
1432 }
1433 spin_lock(&dq_data_lock);
1434 space = inode_get_bytes(inode);
1435 /* Build the transfer_from list and check the limits */
1436 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1437 if (transfer_to[cnt] == NODQUOT)
1438 continue;
1439 transfer_from[cnt] = inode->i_dquot[cnt];
Jan Kara657d3bf2008-07-25 01:46:52 -07001440 if (check_idq(transfer_to[cnt], 1, warntype_to + cnt) ==
1441 NO_QUOTA || check_bdq(transfer_to[cnt], space, 0,
1442 warntype_to + cnt) == NO_QUOTA)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443 goto warn_put_all;
1444 }
1445
1446 /*
1447 * Finally perform the needed transfer from transfer_from to transfer_to
1448 */
1449 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1450 /*
1451 * Skip changes for same uid or gid or for turned off quota-type.
1452 */
1453 if (transfer_to[cnt] == NODQUOT)
1454 continue;
1455
1456 /* Due to IO error we might not have transfer_from[] structure */
1457 if (transfer_from[cnt]) {
Jan Kara657d3bf2008-07-25 01:46:52 -07001458 warntype_from_inodes[cnt] =
1459 info_idq_free(transfer_from[cnt], 1);
1460 warntype_from_space[cnt] =
1461 info_bdq_free(transfer_from[cnt], space);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462 dquot_decr_inodes(transfer_from[cnt], 1);
1463 dquot_decr_space(transfer_from[cnt], space);
1464 }
1465
1466 dquot_incr_inodes(transfer_to[cnt], 1);
1467 dquot_incr_space(transfer_to[cnt], space);
1468
1469 inode->i_dquot[cnt] = transfer_to[cnt];
1470 }
1471 ret = QUOTA_OK;
1472warn_put_all:
1473 spin_unlock(&dq_data_lock);
1474 /* Dirtify all the dquots - this can block when journalling */
1475 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1476 if (transfer_from[cnt])
1477 mark_dquot_dirty(transfer_from[cnt]);
1478 if (transfer_to[cnt])
1479 mark_dquot_dirty(transfer_to[cnt]);
1480 }
Jan Kara657d3bf2008-07-25 01:46:52 -07001481 flush_warnings(transfer_to, warntype_to);
1482 flush_warnings(transfer_from, warntype_from_inodes);
1483 flush_warnings(transfer_from, warntype_from_space);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484
1485 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1486 if (ret == QUOTA_OK && transfer_from[cnt] != NODQUOT)
1487 dqput(transfer_from[cnt]);
1488 if (ret == NO_QUOTA && transfer_to[cnt] != NODQUOT)
1489 dqput(transfer_to[cnt]);
1490 }
1491 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
1492 return ret;
1493}
1494
Jan Karab85f4b82008-07-25 01:46:50 -07001495/* Wrapper for transferring ownership of an inode */
1496int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
1497{
1498 if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode)) {
1499 vfs_dq_init(inode);
1500 if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA)
1501 return 1;
1502 }
1503 return 0;
1504}
1505
1506
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507/*
1508 * Write info of quota file to disk
1509 */
1510int dquot_commit_info(struct super_block *sb, int type)
1511{
1512 int ret;
1513 struct quota_info *dqopt = sb_dqopt(sb);
1514
Ingo Molnard3be9152006-03-23 03:00:29 -08001515 mutex_lock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 ret = dqopt->ops[type]->write_file_info(sb, type);
Ingo Molnard3be9152006-03-23 03:00:29 -08001517 mutex_unlock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518 return ret;
1519}
1520
1521/*
1522 * Definitions of diskquota operations.
1523 */
1524struct dquot_operations dquot_operations = {
1525 .initialize = dquot_initialize,
1526 .drop = dquot_drop,
1527 .alloc_space = dquot_alloc_space,
1528 .alloc_inode = dquot_alloc_inode,
1529 .free_space = dquot_free_space,
1530 .free_inode = dquot_free_inode,
1531 .transfer = dquot_transfer,
1532 .write_dquot = dquot_commit,
1533 .acquire_dquot = dquot_acquire,
1534 .release_dquot = dquot_release,
1535 .mark_dirty = dquot_mark_dquot_dirty,
1536 .write_info = dquot_commit_info
1537};
1538
1539static inline void set_enable_flags(struct quota_info *dqopt, int type)
1540{
1541 switch (type) {
1542 case USRQUOTA:
1543 dqopt->flags |= DQUOT_USR_ENABLED;
Jan Kara0ff5af82008-04-28 02:14:33 -07001544 dqopt->flags &= ~DQUOT_USR_SUSPENDED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 break;
1546 case GRPQUOTA:
1547 dqopt->flags |= DQUOT_GRP_ENABLED;
Jan Kara0ff5af82008-04-28 02:14:33 -07001548 dqopt->flags &= ~DQUOT_GRP_SUSPENDED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 break;
1550 }
1551}
1552
Jan Kara0ff5af82008-04-28 02:14:33 -07001553static inline void reset_enable_flags(struct quota_info *dqopt, int type,
1554 int remount)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555{
1556 switch (type) {
1557 case USRQUOTA:
1558 dqopt->flags &= ~DQUOT_USR_ENABLED;
Jan Kara0ff5af82008-04-28 02:14:33 -07001559 if (remount)
1560 dqopt->flags |= DQUOT_USR_SUSPENDED;
1561 else
1562 dqopt->flags &= ~DQUOT_USR_SUSPENDED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563 break;
1564 case GRPQUOTA:
1565 dqopt->flags &= ~DQUOT_GRP_ENABLED;
Jan Kara0ff5af82008-04-28 02:14:33 -07001566 if (remount)
1567 dqopt->flags |= DQUOT_GRP_SUSPENDED;
1568 else
1569 dqopt->flags &= ~DQUOT_GRP_SUSPENDED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 break;
1571 }
1572}
1573
Jan Kara0ff5af82008-04-28 02:14:33 -07001574
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575/*
1576 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1577 */
Jan Kara0ff5af82008-04-28 02:14:33 -07001578int vfs_quota_off(struct super_block *sb, int type, int remount)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579{
Jan Kara0ff5af82008-04-28 02:14:33 -07001580 int cnt, ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 struct quota_info *dqopt = sb_dqopt(sb);
1582 struct inode *toputinode[MAXQUOTAS];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583
1584 /* We need to serialize quota_off() for device */
Ingo Molnard3be9152006-03-23 03:00:29 -08001585 mutex_lock(&dqopt->dqonoff_mutex);
Jan Kara9377abd2008-05-12 14:02:08 -07001586
1587 /*
1588 * Skip everything if there's nothing to do. We have to do this because
1589 * sometimes we are called when fill_super() failed and calling
1590 * sync_fs() in such cases does no good.
1591 */
1592 if (!sb_any_quota_enabled(sb) && !sb_any_quota_suspended(sb)) {
1593 mutex_unlock(&dqopt->dqonoff_mutex);
1594 return 0;
1595 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1597 toputinode[cnt] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598 if (type != -1 && cnt != type)
1599 continue;
Jan Kara0ff5af82008-04-28 02:14:33 -07001600 /* If we keep inodes of quota files after remount and quotaoff
1601 * is called, drop kept inodes. */
1602 if (!remount && sb_has_quota_suspended(sb, cnt)) {
1603 iput(dqopt->files[cnt]);
1604 dqopt->files[cnt] = NULL;
1605 reset_enable_flags(dqopt, cnt, 0);
1606 continue;
1607 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608 if (!sb_has_quota_enabled(sb, cnt))
1609 continue;
Jan Kara0ff5af82008-04-28 02:14:33 -07001610 reset_enable_flags(dqopt, cnt, remount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611
1612 /* Note: these are blocking operations */
1613 drop_dquot_ref(sb, cnt);
1614 invalidate_dquots(sb, cnt);
1615 /*
1616 * Now all dquots should be invalidated, all writes done so we should be only
1617 * users of the info. No locks needed.
1618 */
1619 if (info_dirty(&dqopt->info[cnt]))
1620 sb->dq_op->write_info(sb, cnt);
1621 if (dqopt->ops[cnt]->free_file_info)
1622 dqopt->ops[cnt]->free_file_info(sb, cnt);
1623 put_quota_format(dqopt->info[cnt].dqi_format);
1624
1625 toputinode[cnt] = dqopt->files[cnt];
Jan Kara0ff5af82008-04-28 02:14:33 -07001626 if (!remount)
1627 dqopt->files[cnt] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628 dqopt->info[cnt].dqi_flags = 0;
1629 dqopt->info[cnt].dqi_igrace = 0;
1630 dqopt->info[cnt].dqi_bgrace = 0;
1631 dqopt->ops[cnt] = NULL;
1632 }
Ingo Molnard3be9152006-03-23 03:00:29 -08001633 mutex_unlock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 /* Sync the superblock so that buffers with quota data are written to
Al Viro7b7b1ac2005-11-07 17:13:39 -05001635 * disk (and so userspace sees correct data afterwards). */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636 if (sb->s_op->sync_fs)
1637 sb->s_op->sync_fs(sb, 1);
1638 sync_blockdev(sb->s_bdev);
1639 /* Now the quota files are just ordinary files and we can set the
1640 * inode flags back. Moreover we discard the pagecache so that
1641 * userspace sees the writes we did bypassing the pagecache. We
1642 * must also discard the blockdev buffers so that we see the
1643 * changes done by userspace on the next quotaon() */
1644 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
1645 if (toputinode[cnt]) {
Ingo Molnard3be9152006-03-23 03:00:29 -08001646 mutex_lock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647 /* If quota was reenabled in the meantime, we have
1648 * nothing to do */
1649 if (!sb_has_quota_enabled(sb, cnt)) {
Jan Kara79254092007-05-16 22:11:19 -07001650 mutex_lock_nested(&toputinode[cnt]->i_mutex, I_MUTEX_QUOTA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651 toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
1652 S_NOATIME | S_NOQUOTA);
1653 truncate_inode_pages(&toputinode[cnt]->i_data, 0);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001654 mutex_unlock(&toputinode[cnt]->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655 mark_inode_dirty(toputinode[cnt]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 }
Ingo Molnard3be9152006-03-23 03:00:29 -08001657 mutex_unlock(&dqopt->dqonoff_mutex);
Jan Kara0ff5af82008-04-28 02:14:33 -07001658 /* On remount RO, we keep the inode pointer so that we
1659 * can reenable quota on the subsequent remount RW.
1660 * But we have better not keep inode pointer when there
1661 * is pending delete on the quota file... */
1662 if (!remount)
1663 iput(toputinode[cnt]);
1664 else if (!toputinode[cnt]->i_nlink)
1665 ret = -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666 }
1667 if (sb->s_bdev)
Peter Zijlstraf98393a2007-05-06 14:49:54 -07001668 invalidate_bdev(sb->s_bdev);
Jan Kara0ff5af82008-04-28 02:14:33 -07001669 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670}
1671
1672/*
1673 * Turn quotas on on a device
1674 */
1675
1676/* Helper function when we already have the inode */
1677static int vfs_quota_on_inode(struct inode *inode, int type, int format_id)
1678{
1679 struct quota_format_type *fmt = find_quota_format(format_id);
1680 struct super_block *sb = inode->i_sb;
1681 struct quota_info *dqopt = sb_dqopt(sb);
1682 int error;
1683 int oldflags = -1;
1684
1685 if (!fmt)
1686 return -ESRCH;
1687 if (!S_ISREG(inode->i_mode)) {
1688 error = -EACCES;
1689 goto out_fmt;
1690 }
1691 if (IS_RDONLY(inode)) {
1692 error = -EROFS;
1693 goto out_fmt;
1694 }
1695 if (!sb->s_op->quota_write || !sb->s_op->quota_read) {
1696 error = -EINVAL;
1697 goto out_fmt;
1698 }
1699
1700 /* As we bypass the pagecache we must now flush the inode so that
1701 * we see all the changes from userspace... */
1702 write_inode_now(inode, 1);
1703 /* And now flush the block cache so that kernel sees the changes */
Peter Zijlstraf98393a2007-05-06 14:49:54 -07001704 invalidate_bdev(sb->s_bdev);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001705 mutex_lock(&inode->i_mutex);
Ingo Molnard3be9152006-03-23 03:00:29 -08001706 mutex_lock(&dqopt->dqonoff_mutex);
Jan Kara0ff5af82008-04-28 02:14:33 -07001707 if (sb_has_quota_enabled(sb, type) ||
1708 sb_has_quota_suspended(sb, type)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 error = -EBUSY;
1710 goto out_lock;
1711 }
1712 /* We don't want quota and atime on quota files (deadlocks possible)
1713 * Also nobody should write to the file - we use special IO operations
1714 * which ignore the immutable bit. */
1715 down_write(&dqopt->dqptr_sem);
1716 oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | S_NOQUOTA);
1717 inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
1718 up_write(&dqopt->dqptr_sem);
Jan Kara31e7ad62005-04-16 15:25:46 -07001719 sb->dq_op->drop(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720
1721 error = -EIO;
1722 dqopt->files[type] = igrab(inode);
1723 if (!dqopt->files[type])
1724 goto out_lock;
1725 error = -EINVAL;
1726 if (!fmt->qf_ops->check_quota_file(sb, type))
1727 goto out_file_init;
1728
1729 dqopt->ops[type] = fmt->qf_ops;
1730 dqopt->info[type].dqi_format = fmt;
Jan Kara0ff5af82008-04-28 02:14:33 -07001731 dqopt->info[type].dqi_fmt_id = format_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732 INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
Ingo Molnard3be9152006-03-23 03:00:29 -08001733 mutex_lock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734 if ((error = dqopt->ops[type]->read_file_info(sb, type)) < 0) {
Ingo Molnard3be9152006-03-23 03:00:29 -08001735 mutex_unlock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736 goto out_file_init;
1737 }
Ingo Molnard3be9152006-03-23 03:00:29 -08001738 mutex_unlock(&dqopt->dqio_mutex);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001739 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740 set_enable_flags(dqopt, type);
1741
1742 add_dquot_ref(sb, type);
Ingo Molnard3be9152006-03-23 03:00:29 -08001743 mutex_unlock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744
1745 return 0;
1746
1747out_file_init:
1748 dqopt->files[type] = NULL;
1749 iput(inode);
1750out_lock:
Ingo Molnard3be9152006-03-23 03:00:29 -08001751 mutex_unlock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752 if (oldflags != -1) {
1753 down_write(&dqopt->dqptr_sem);
1754 /* Set the flags back (in the case of accidental quotaon()
1755 * on a wrong file we don't want to mess up the flags) */
1756 inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
1757 inode->i_flags |= oldflags;
1758 up_write(&dqopt->dqptr_sem);
1759 }
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001760 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761out_fmt:
1762 put_quota_format(fmt);
1763
1764 return error;
1765}
1766
Jan Kara0ff5af82008-04-28 02:14:33 -07001767/* Reenable quotas on remount RW */
1768static int vfs_quota_on_remount(struct super_block *sb, int type)
1769{
1770 struct quota_info *dqopt = sb_dqopt(sb);
1771 struct inode *inode;
1772 int ret;
1773
1774 mutex_lock(&dqopt->dqonoff_mutex);
1775 if (!sb_has_quota_suspended(sb, type)) {
1776 mutex_unlock(&dqopt->dqonoff_mutex);
1777 return 0;
1778 }
1779 BUG_ON(sb_has_quota_enabled(sb, type));
1780
1781 inode = dqopt->files[type];
1782 dqopt->files[type] = NULL;
1783 reset_enable_flags(dqopt, type, 0);
1784 mutex_unlock(&dqopt->dqonoff_mutex);
1785
1786 ret = vfs_quota_on_inode(inode, type, dqopt->info[type].dqi_fmt_id);
1787 iput(inode);
1788
1789 return ret;
1790}
1791
Al Viro77e69da2008-08-01 04:29:18 -04001792int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
1793 struct path *path)
1794{
1795 int error = security_quota_on(path->dentry);
1796 if (error)
1797 return error;
1798 /* Quota file not on the same filesystem? */
1799 if (path->mnt->mnt_sb != sb)
1800 error = -EXDEV;
1801 else
1802 error = vfs_quota_on_inode(path->dentry->d_inode, type,
1803 format_id);
1804 return error;
1805}
1806
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807/* Actual function called from quotactl() */
Al Viro82646132008-08-02 00:57:06 -04001808int vfs_quota_on(struct super_block *sb, int type, int format_id, char *name,
Jan Kara0ff5af82008-04-28 02:14:33 -07001809 int remount)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810{
Al Viro82646132008-08-02 00:57:06 -04001811 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812 int error;
1813
Jan Kara0ff5af82008-04-28 02:14:33 -07001814 if (remount)
1815 return vfs_quota_on_remount(sb, type);
1816
Al Viro82646132008-08-02 00:57:06 -04001817 error = kern_path(name, LOOKUP_FOLLOW, &path);
Al Viro77e69da2008-08-01 04:29:18 -04001818 if (!error) {
Al Viro82646132008-08-02 00:57:06 -04001819 error = vfs_quota_on_path(sb, type, format_id, &path);
1820 path_put(&path);
Al Viro77e69da2008-08-01 04:29:18 -04001821 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822 return error;
1823}
1824
1825/*
1826 * This function is used when filesystem needs to initialize quotas
1827 * during mount time.
1828 */
Christoph Hellwig84de8562005-06-23 00:09:16 -07001829int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
1830 int format_id, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831{
Christoph Hellwig84de8562005-06-23 00:09:16 -07001832 struct dentry *dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 int error;
1834
Christoph Hellwig2fa389c2005-06-23 00:09:16 -07001835 dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
Christoph Hellwig84de8562005-06-23 00:09:16 -07001836 if (IS_ERR(dentry))
1837 return PTR_ERR(dentry);
1838
Jan Kara154f4842005-11-28 13:44:14 -08001839 if (!dentry->d_inode) {
1840 error = -ENOENT;
1841 goto out;
1842 }
1843
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844 error = security_quota_on(dentry);
Christoph Hellwig84de8562005-06-23 00:09:16 -07001845 if (!error)
1846 error = vfs_quota_on_inode(dentry->d_inode, type, format_id);
1847
Jan Kara154f4842005-11-28 13:44:14 -08001848out:
Christoph Hellwig84de8562005-06-23 00:09:16 -07001849 dput(dentry);
1850 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851}
1852
Jan Karab85f4b82008-07-25 01:46:50 -07001853/* Wrapper to turn on quotas when remounting rw */
1854int vfs_dq_quota_on_remount(struct super_block *sb)
1855{
1856 int cnt;
1857 int ret = 0, err;
1858
1859 if (!sb->s_qcop || !sb->s_qcop->quota_on)
1860 return -ENOSYS;
1861 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1862 err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1);
1863 if (err < 0 && !ret)
1864 ret = err;
1865 }
1866 return ret;
1867}
1868
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869/* Generic routine for getting common part of quota structure */
1870static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di)
1871{
1872 struct mem_dqblk *dm = &dquot->dq_dqb;
1873
1874 spin_lock(&dq_data_lock);
1875 di->dqb_bhardlimit = dm->dqb_bhardlimit;
1876 di->dqb_bsoftlimit = dm->dqb_bsoftlimit;
1877 di->dqb_curspace = dm->dqb_curspace;
1878 di->dqb_ihardlimit = dm->dqb_ihardlimit;
1879 di->dqb_isoftlimit = dm->dqb_isoftlimit;
1880 di->dqb_curinodes = dm->dqb_curinodes;
1881 di->dqb_btime = dm->dqb_btime;
1882 di->dqb_itime = dm->dqb_itime;
1883 di->dqb_valid = QIF_ALL;
1884 spin_unlock(&dq_data_lock);
1885}
1886
1887int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
1888{
1889 struct dquot *dquot;
1890
Ingo Molnard3be9152006-03-23 03:00:29 -08001891 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 if (!(dquot = dqget(sb, id, type))) {
Ingo Molnard3be9152006-03-23 03:00:29 -08001893 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894 return -ESRCH;
1895 }
1896 do_get_dqblk(dquot, di);
1897 dqput(dquot);
Ingo Molnard3be9152006-03-23 03:00:29 -08001898 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899 return 0;
1900}
1901
1902/* Generic routine for setting common part of quota structure */
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07001903static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904{
1905 struct mem_dqblk *dm = &dquot->dq_dqb;
1906 int check_blim = 0, check_ilim = 0;
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07001907 struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_type];
1908
1909 if ((di->dqb_valid & QIF_BLIMITS &&
1910 (di->dqb_bhardlimit > dqi->dqi_maxblimit ||
1911 di->dqb_bsoftlimit > dqi->dqi_maxblimit)) ||
1912 (di->dqb_valid & QIF_ILIMITS &&
1913 (di->dqb_ihardlimit > dqi->dqi_maxilimit ||
1914 di->dqb_isoftlimit > dqi->dqi_maxilimit)))
1915 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916
1917 spin_lock(&dq_data_lock);
1918 if (di->dqb_valid & QIF_SPACE) {
1919 dm->dqb_curspace = di->dqb_curspace;
1920 check_blim = 1;
1921 }
1922 if (di->dqb_valid & QIF_BLIMITS) {
1923 dm->dqb_bsoftlimit = di->dqb_bsoftlimit;
1924 dm->dqb_bhardlimit = di->dqb_bhardlimit;
1925 check_blim = 1;
1926 }
1927 if (di->dqb_valid & QIF_INODES) {
1928 dm->dqb_curinodes = di->dqb_curinodes;
1929 check_ilim = 1;
1930 }
1931 if (di->dqb_valid & QIF_ILIMITS) {
1932 dm->dqb_isoftlimit = di->dqb_isoftlimit;
1933 dm->dqb_ihardlimit = di->dqb_ihardlimit;
1934 check_ilim = 1;
1935 }
1936 if (di->dqb_valid & QIF_BTIME)
1937 dm->dqb_btime = di->dqb_btime;
1938 if (di->dqb_valid & QIF_ITIME)
1939 dm->dqb_itime = di->dqb_itime;
1940
1941 if (check_blim) {
1942 if (!dm->dqb_bsoftlimit || toqb(dm->dqb_curspace) < dm->dqb_bsoftlimit) {
1943 dm->dqb_btime = 0;
1944 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
1945 }
1946 else if (!(di->dqb_valid & QIF_BTIME)) /* Set grace only if user hasn't provided his own... */
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07001947 dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948 }
1949 if (check_ilim) {
1950 if (!dm->dqb_isoftlimit || dm->dqb_curinodes < dm->dqb_isoftlimit) {
1951 dm->dqb_itime = 0;
1952 clear_bit(DQ_INODES_B, &dquot->dq_flags);
1953 }
1954 else if (!(di->dqb_valid & QIF_ITIME)) /* Set grace only if user hasn't provided his own... */
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07001955 dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956 }
1957 if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit || dm->dqb_isoftlimit)
1958 clear_bit(DQ_FAKE_B, &dquot->dq_flags);
1959 else
1960 set_bit(DQ_FAKE_B, &dquot->dq_flags);
1961 spin_unlock(&dq_data_lock);
1962 mark_dquot_dirty(dquot);
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07001963
1964 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965}
1966
1967int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di)
1968{
1969 struct dquot *dquot;
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07001970 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001971
Ingo Molnard3be9152006-03-23 03:00:29 -08001972 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001973 if (!(dquot = dqget(sb, id, type))) {
Ingo Molnard3be9152006-03-23 03:00:29 -08001974 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975 return -ESRCH;
1976 }
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07001977 rc = do_set_dqblk(dquot, di);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978 dqput(dquot);
Ingo Molnard3be9152006-03-23 03:00:29 -08001979 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07001980 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001981}
1982
1983/* Generic routine for getting common part of quota file information */
1984int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
1985{
1986 struct mem_dqinfo *mi;
1987
Ingo Molnard3be9152006-03-23 03:00:29 -08001988 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989 if (!sb_has_quota_enabled(sb, type)) {
Ingo Molnard3be9152006-03-23 03:00:29 -08001990 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001991 return -ESRCH;
1992 }
1993 mi = sb_dqopt(sb)->info + type;
1994 spin_lock(&dq_data_lock);
1995 ii->dqi_bgrace = mi->dqi_bgrace;
1996 ii->dqi_igrace = mi->dqi_igrace;
1997 ii->dqi_flags = mi->dqi_flags & DQF_MASK;
1998 ii->dqi_valid = IIF_ALL;
1999 spin_unlock(&dq_data_lock);
Ingo Molnard3be9152006-03-23 03:00:29 -08002000 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001 return 0;
2002}
2003
2004/* Generic routine for setting common part of quota file information */
2005int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
2006{
2007 struct mem_dqinfo *mi;
2008
Ingo Molnard3be9152006-03-23 03:00:29 -08002009 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010 if (!sb_has_quota_enabled(sb, type)) {
Ingo Molnard3be9152006-03-23 03:00:29 -08002011 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002012 return -ESRCH;
2013 }
2014 mi = sb_dqopt(sb)->info + type;
2015 spin_lock(&dq_data_lock);
2016 if (ii->dqi_valid & IIF_BGRACE)
2017 mi->dqi_bgrace = ii->dqi_bgrace;
2018 if (ii->dqi_valid & IIF_IGRACE)
2019 mi->dqi_igrace = ii->dqi_igrace;
2020 if (ii->dqi_valid & IIF_FLAGS)
2021 mi->dqi_flags = (mi->dqi_flags & ~DQF_MASK) | (ii->dqi_flags & DQF_MASK);
2022 spin_unlock(&dq_data_lock);
2023 mark_info_dirty(sb, type);
2024 /* Force write to disk */
2025 sb->dq_op->write_info(sb, type);
Ingo Molnard3be9152006-03-23 03:00:29 -08002026 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002027 return 0;
2028}
2029
2030struct quotactl_ops vfs_quotactl_ops = {
2031 .quota_on = vfs_quota_on,
2032 .quota_off = vfs_quota_off,
2033 .quota_sync = vfs_quota_sync,
2034 .get_info = vfs_get_dqinfo,
2035 .set_info = vfs_set_dqinfo,
2036 .get_dqblk = vfs_get_dqblk,
2037 .set_dqblk = vfs_set_dqblk
2038};
2039
2040static ctl_table fs_dqstats_table[] = {
2041 {
2042 .ctl_name = FS_DQ_LOOKUPS,
2043 .procname = "lookups",
2044 .data = &dqstats.lookups,
2045 .maxlen = sizeof(int),
2046 .mode = 0444,
2047 .proc_handler = &proc_dointvec,
2048 },
2049 {
2050 .ctl_name = FS_DQ_DROPS,
2051 .procname = "drops",
2052 .data = &dqstats.drops,
2053 .maxlen = sizeof(int),
2054 .mode = 0444,
2055 .proc_handler = &proc_dointvec,
2056 },
2057 {
2058 .ctl_name = FS_DQ_READS,
2059 .procname = "reads",
2060 .data = &dqstats.reads,
2061 .maxlen = sizeof(int),
2062 .mode = 0444,
2063 .proc_handler = &proc_dointvec,
2064 },
2065 {
2066 .ctl_name = FS_DQ_WRITES,
2067 .procname = "writes",
2068 .data = &dqstats.writes,
2069 .maxlen = sizeof(int),
2070 .mode = 0444,
2071 .proc_handler = &proc_dointvec,
2072 },
2073 {
2074 .ctl_name = FS_DQ_CACHE_HITS,
2075 .procname = "cache_hits",
2076 .data = &dqstats.cache_hits,
2077 .maxlen = sizeof(int),
2078 .mode = 0444,
2079 .proc_handler = &proc_dointvec,
2080 },
2081 {
2082 .ctl_name = FS_DQ_ALLOCATED,
2083 .procname = "allocated_dquots",
2084 .data = &dqstats.allocated_dquots,
2085 .maxlen = sizeof(int),
2086 .mode = 0444,
2087 .proc_handler = &proc_dointvec,
2088 },
2089 {
2090 .ctl_name = FS_DQ_FREE,
2091 .procname = "free_dquots",
2092 .data = &dqstats.free_dquots,
2093 .maxlen = sizeof(int),
2094 .mode = 0444,
2095 .proc_handler = &proc_dointvec,
2096 },
2097 {
2098 .ctl_name = FS_DQ_SYNCS,
2099 .procname = "syncs",
2100 .data = &dqstats.syncs,
2101 .maxlen = sizeof(int),
2102 .mode = 0444,
2103 .proc_handler = &proc_dointvec,
2104 },
Jan Kara8e893462007-10-16 23:29:31 -07002105#ifdef CONFIG_PRINT_QUOTA_WARNING
Linus Torvalds1da177e2005-04-16 15:20:36 -07002106 {
2107 .ctl_name = FS_DQ_WARNINGS,
2108 .procname = "warnings",
2109 .data = &flag_print_warnings,
2110 .maxlen = sizeof(int),
2111 .mode = 0644,
2112 .proc_handler = &proc_dointvec,
2113 },
Jan Kara8e893462007-10-16 23:29:31 -07002114#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115 { .ctl_name = 0 },
2116};
2117
2118static ctl_table fs_table[] = {
2119 {
2120 .ctl_name = FS_DQSTATS,
2121 .procname = "quota",
2122 .mode = 0555,
2123 .child = fs_dqstats_table,
2124 },
2125 { .ctl_name = 0 },
2126};
2127
2128static ctl_table sys_table[] = {
2129 {
2130 .ctl_name = CTL_FS,
2131 .procname = "fs",
2132 .mode = 0555,
2133 .child = fs_table,
2134 },
2135 { .ctl_name = 0 },
2136};
2137
2138static int __init dquot_init(void)
2139{
2140 int i;
2141 unsigned long nr_hash, order;
2142
2143 printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
2144
Eric W. Biederman0b4d4142007-02-14 00:34:09 -08002145 register_sysctl_table(sys_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002146
Paul Mundt20c2df82007-07-20 10:11:58 +09002147 dquot_cachep = kmem_cache_create("dquot",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002148 sizeof(struct dquot), sizeof(unsigned long) * 4,
Paul Jacksonfffb60f2006-03-24 03:16:06 -08002149 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
2150 SLAB_MEM_SPREAD|SLAB_PANIC),
Paul Mundt20c2df82007-07-20 10:11:58 +09002151 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002152
2153 order = 0;
2154 dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
2155 if (!dquot_hash)
2156 panic("Cannot create dquot hash table");
2157
2158 /* Find power-of-two hlist_heads which can fit into allocation */
2159 nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
2160 dq_hash_bits = 0;
2161 do {
2162 dq_hash_bits++;
2163 } while (nr_hash >> dq_hash_bits);
2164 dq_hash_bits--;
2165
2166 nr_hash = 1UL << dq_hash_bits;
2167 dq_hash_mask = nr_hash - 1;
2168 for (i = 0; i < nr_hash; i++)
2169 INIT_HLIST_HEAD(dquot_hash + i);
2170
2171 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2172 nr_hash, order, (PAGE_SIZE << order));
2173
Rusty Russell8e1f9362007-07-17 04:03:17 -07002174 register_shrinker(&dqcache_shrinker);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175
Jan Kara8e893462007-10-16 23:29:31 -07002176#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
2177 if (genl_register_family(&quota_genl_family) != 0)
2178 printk(KERN_ERR "VFS: Failed to create quota netlink interface.\n");
2179#endif
2180
Linus Torvalds1da177e2005-04-16 15:20:36 -07002181 return 0;
2182}
2183module_init(dquot_init);
2184
2185EXPORT_SYMBOL(register_quota_format);
2186EXPORT_SYMBOL(unregister_quota_format);
2187EXPORT_SYMBOL(dqstats);
2188EXPORT_SYMBOL(dq_data_lock);
2189EXPORT_SYMBOL(vfs_quota_on);
Al Viro77e69da2008-08-01 04:29:18 -04002190EXPORT_SYMBOL(vfs_quota_on_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002191EXPORT_SYMBOL(vfs_quota_on_mount);
2192EXPORT_SYMBOL(vfs_quota_off);
2193EXPORT_SYMBOL(vfs_quota_sync);
2194EXPORT_SYMBOL(vfs_get_dqinfo);
2195EXPORT_SYMBOL(vfs_set_dqinfo);
2196EXPORT_SYMBOL(vfs_get_dqblk);
2197EXPORT_SYMBOL(vfs_set_dqblk);
2198EXPORT_SYMBOL(dquot_commit);
2199EXPORT_SYMBOL(dquot_commit_info);
2200EXPORT_SYMBOL(dquot_acquire);
2201EXPORT_SYMBOL(dquot_release);
2202EXPORT_SYMBOL(dquot_mark_dquot_dirty);
2203EXPORT_SYMBOL(dquot_initialize);
2204EXPORT_SYMBOL(dquot_drop);
Jan Karab85f4b82008-07-25 01:46:50 -07002205EXPORT_SYMBOL(vfs_dq_drop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002206EXPORT_SYMBOL(dquot_alloc_space);
2207EXPORT_SYMBOL(dquot_alloc_inode);
2208EXPORT_SYMBOL(dquot_free_space);
2209EXPORT_SYMBOL(dquot_free_inode);
2210EXPORT_SYMBOL(dquot_transfer);
Jan Karab85f4b82008-07-25 01:46:50 -07002211EXPORT_SYMBOL(vfs_dq_transfer);
2212EXPORT_SYMBOL(vfs_dq_quota_on_remount);