blob: f2d0eee9d1f1061399c30a5af36c204c2e3bf491 [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>
Al Viro40401532012-02-13 03:58:52 +000074#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070075#include <linux/kmod.h>
76#include <linux/namei.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>
Dave Chinner55fa6092011-03-22 22:23:40 +110079#include "../internal.h" /* ugh */
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Jeff Liuf3da9312012-05-28 23:40:17 +080081#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
Linus Torvalds1da177e2005-04-16 15:20:36 -070083/*
Jan Karacc334122009-01-12 17:23:05 +010084 * There are three quota SMP locks. dq_list_lock protects all lists with quotas
Dmitry Monakhovdde95882010-04-26 20:03:33 +040085 * and quota formats.
Jan Karacc334122009-01-12 17:23:05 +010086 * dq_data_lock protects data from dq_dqb and also mem_dqinfo structures and
87 * also guards consistency of dquot->dq_dqb with inode->i_blocks, i_bytes.
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 * i_blocks and i_bytes updates itself are guarded by i_lock acquired directly
Jan Karacc334122009-01-12 17:23:05 +010089 * in inode_add_bytes() and inode_sub_bytes(). dq_state_lock protects
90 * modifications of quota state (on quotaon and quotaoff) and readers who care
91 * about latest values take it as well.
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 *
Jan Karacc334122009-01-12 17:23:05 +010093 * The spinlock ordering is hence: dq_data_lock > dq_list_lock > i_lock,
94 * dq_list_lock > dq_state_lock
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 *
96 * Note that some things (eg. sb pointer, type, id) doesn't change during
97 * the life of the dquot structure and so needn't to be protected by a lock
98 *
Niu Yaweib9ba6f92014-06-04 12:23:19 +080099 * Operation accessing dquots via inode pointers are protected by dquot_srcu.
100 * Operation of reading pointer needs srcu_read_lock(&dquot_srcu), and
101 * synchronize_srcu(&dquot_srcu) is called after clearing pointers from
102 * inode and before dropping dquot references to avoid use of dquots after
103 * they are freed. dq_data_lock is used to serialize the pointer setting and
104 * clearing operations.
Jan Kara26245c92010-01-06 17:20:35 +0100105 * Special care needs to be taken about S_NOQUOTA inode flag (marking that
106 * inode is a quota file). Functions adding pointers from inode to dquots have
Niu Yaweib9ba6f92014-06-04 12:23:19 +0800107 * to check this flag under dq_data_lock and then (if S_NOQUOTA is not set) they
108 * have to do all pointer modifications before dropping dq_data_lock. This makes
Jan Kara26245c92010-01-06 17:20:35 +0100109 * sure they cannot race with quotaon which first sets S_NOQUOTA flag and
110 * then drops all pointers to dquots from an inode.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 *
Ingo Molnard3be9152006-03-23 03:00:29 -0800112 * Each dquot has its dq_lock mutex. Locked dquots might not be referenced
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 * from inodes (dquot_alloc_space() and such don't check the dq_lock).
114 * Currently dquot is locked only when it is being read to memory (or space for
115 * it is being allocated) on the first dqget() and when it is being released on
116 * the last dqput(). The allocation and release oparations are serialized by
117 * the dq_lock and by checking the use count in dquot_release(). Write
118 * operations on dquots don't hold dq_lock as they copy data under dq_data_lock
119 * spinlock to internal buffers before writing.
120 *
121 * Lock ordering (including related VFS locks) is the following:
Niu Yaweib9ba6f92014-06-04 12:23:19 +0800122 * dqonoff_mutex > i_mutex > journal_lock > dquot->dq_lock > dqio_mutex
Jan Karaa80b12c2012-04-25 21:15:53 +0200123 * dqonoff_mutex > i_mutex comes from dquot_quota_sync, dquot_enable, etc.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 */
125
Jan Karac5166102009-01-26 15:32:46 +0100126static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock);
127static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_state_lock);
128__cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_data_lock);
Mingming Cao08d03502009-01-14 16:19:32 +0100129EXPORT_SYMBOL(dq_data_lock);
Niu Yaweib9ba6f92014-06-04 12:23:19 +0800130DEFINE_STATIC_SRCU(dquot_srcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Jiaying Zhangfb5ffb02010-07-20 16:54:43 +0200132void __quota_error(struct super_block *sb, const char *func,
Joe Perches055adcb2010-11-23 18:49:54 -0800133 const char *fmt, ...)
Jiaying Zhangfb5ffb02010-07-20 16:54:43 +0200134{
Jiaying Zhangfb5ffb02010-07-20 16:54:43 +0200135 if (printk_ratelimit()) {
Joe Perches055adcb2010-11-23 18:49:54 -0800136 va_list args;
137 struct va_format vaf;
138
Jiaying Zhangfb5ffb02010-07-20 16:54:43 +0200139 va_start(args, fmt);
Joe Perches055adcb2010-11-23 18:49:54 -0800140
141 vaf.fmt = fmt;
142 vaf.va = &args;
143
144 printk(KERN_ERR "Quota error (device %s): %s: %pV\n",
145 sb->s_id, func, &vaf);
146
Jiaying Zhangfb5ffb02010-07-20 16:54:43 +0200147 va_end(args);
148 }
149}
150EXPORT_SYMBOL(__quota_error);
151
Sergey Senozhatskyda8d1ba2010-04-26 12:09:26 +0200152#if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153static char *quotatypes[] = INITQFNAMES;
Sergey Senozhatskyda8d1ba2010-04-26 12:09:26 +0200154#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155static struct quota_format_type *quota_formats; /* List of registered formats */
156static struct quota_module_name module_names[] = INIT_QUOTA_MODULE_NAMES;
157
158/* SLAB cache for dquot structures */
Christoph Lametere18b8902006-12-06 20:33:20 -0800159static struct kmem_cache *dquot_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
161int register_quota_format(struct quota_format_type *fmt)
162{
163 spin_lock(&dq_list_lock);
164 fmt->qf_next = quota_formats;
165 quota_formats = fmt;
166 spin_unlock(&dq_list_lock);
167 return 0;
168}
Mingming Cao08d03502009-01-14 16:19:32 +0100169EXPORT_SYMBOL(register_quota_format);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
171void unregister_quota_format(struct quota_format_type *fmt)
172{
173 struct quota_format_type **actqf;
174
175 spin_lock(&dq_list_lock);
Jan Kara268157b2009-01-27 15:47:22 +0100176 for (actqf = &quota_formats; *actqf && *actqf != fmt;
177 actqf = &(*actqf)->qf_next)
178 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 if (*actqf)
180 *actqf = (*actqf)->qf_next;
181 spin_unlock(&dq_list_lock);
182}
Mingming Cao08d03502009-01-14 16:19:32 +0100183EXPORT_SYMBOL(unregister_quota_format);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
185static struct quota_format_type *find_quota_format(int id)
186{
187 struct quota_format_type *actqf;
188
189 spin_lock(&dq_list_lock);
Jan Kara268157b2009-01-27 15:47:22 +0100190 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id;
191 actqf = actqf->qf_next)
192 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 if (!actqf || !try_module_get(actqf->qf_owner)) {
194 int qm;
195
196 spin_unlock(&dq_list_lock);
197
Jan Kara268157b2009-01-27 15:47:22 +0100198 for (qm = 0; module_names[qm].qm_fmt_id &&
199 module_names[qm].qm_fmt_id != id; qm++)
200 ;
201 if (!module_names[qm].qm_fmt_id ||
202 request_module(module_names[qm].qm_mod_name))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 return NULL;
204
205 spin_lock(&dq_list_lock);
Jan Kara268157b2009-01-27 15:47:22 +0100206 for (actqf = quota_formats; actqf && actqf->qf_fmt_id != id;
207 actqf = actqf->qf_next)
208 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 if (actqf && !try_module_get(actqf->qf_owner))
210 actqf = NULL;
211 }
212 spin_unlock(&dq_list_lock);
213 return actqf;
214}
215
216static void put_quota_format(struct quota_format_type *fmt)
217{
218 module_put(fmt->qf_owner);
219}
220
221/*
222 * Dquot List Management:
223 * The quota code uses three lists for dquot management: the inuse_list,
224 * free_dquots, and dquot_hash[] array. A single dquot structure may be
225 * on all three lists, depending on its current state.
226 *
227 * All dquots are placed to the end of inuse_list when first created, and this
228 * list is used for invalidate operation, which must look at every dquot.
229 *
230 * Unused dquots (dq_count == 0) are added to the free_dquots list when freed,
231 * and this list is searched whenever we need an available dquot. Dquots are
232 * removed from the list as soon as they are used again, and
233 * dqstats.free_dquots gives the number of dquots on the list. When
234 * dquot is invalidated it's completely released from memory.
235 *
236 * Dquots with a specific identity (device, type and id) are placed on
237 * one of the dquot_hash[] hash chains. The provides an efficient search
238 * mechanism to locate a specific dquot.
239 */
240
241static LIST_HEAD(inuse_list);
242static LIST_HEAD(free_dquots);
243static unsigned int dq_hash_bits, dq_hash_mask;
244static struct hlist_head *dquot_hash;
245
246struct dqstats dqstats;
Mingming Cao08d03502009-01-14 16:19:32 +0100247EXPORT_SYMBOL(dqstats);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
Jan Kara0a5a9c72010-02-09 18:20:39 +0100249static qsize_t inode_get_rsv_space(struct inode *inode);
Christoph Hellwig871a2932010-03-03 09:05:07 -0500250static void __dquot_initialize(struct inode *inode, int type);
Jan Kara0a5a9c72010-02-09 18:20:39 +0100251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252static inline unsigned int
Eric W. Biederman1a06d422012-09-16 05:45:30 -0700253hashfn(const struct super_block *sb, struct kqid qid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254{
Eric W. Biederman1a06d422012-09-16 05:45:30 -0700255 unsigned int id = from_kqid(&init_user_ns, qid);
256 int type = qid.type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 unsigned long tmp;
258
259 tmp = (((unsigned long)sb>>L1_CACHE_SHIFT) ^ id) * (MAXQUOTAS - type);
260 return (tmp + (tmp >> dq_hash_bits)) & dq_hash_mask;
261}
262
263/*
264 * Following list functions expect dq_list_lock to be held
265 */
266static inline void insert_dquot_hash(struct dquot *dquot)
267{
Jan Kara268157b2009-01-27 15:47:22 +0100268 struct hlist_head *head;
Eric W. Biederman1a06d422012-09-16 05:45:30 -0700269 head = dquot_hash + hashfn(dquot->dq_sb, dquot->dq_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 hlist_add_head(&dquot->dq_hash, head);
271}
272
273static inline void remove_dquot_hash(struct dquot *dquot)
274{
275 hlist_del_init(&dquot->dq_hash);
276}
277
Jan Kara7a2435d2009-01-27 01:47:11 +0100278static struct dquot *find_dquot(unsigned int hashent, struct super_block *sb,
Eric W. Biederman1a06d422012-09-16 05:45:30 -0700279 struct kqid qid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280{
281 struct hlist_node *node;
282 struct dquot *dquot;
283
284 hlist_for_each (node, dquot_hash+hashent) {
285 dquot = hlist_entry(node, struct dquot, dq_hash);
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700286 if (dquot->dq_sb == sb && qid_eq(dquot->dq_id, qid))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 return dquot;
288 }
Jan Karadd6f3c62009-01-26 16:01:43 +0100289 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290}
291
292/* Add a dquot to the tail of the free list */
293static inline void put_dquot_last(struct dquot *dquot)
294{
Akinobu Mita8e130592006-06-26 00:24:37 -0700295 list_add_tail(&dquot->dq_free, &free_dquots);
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400296 dqstats_inc(DQST_FREE_DQUOTS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297}
298
299static inline void remove_free_dquot(struct dquot *dquot)
300{
301 if (list_empty(&dquot->dq_free))
302 return;
303 list_del_init(&dquot->dq_free);
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400304 dqstats_dec(DQST_FREE_DQUOTS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305}
306
307static inline void put_inuse(struct dquot *dquot)
308{
309 /* We add to the back of inuse list so we don't have to restart
310 * when traversing this list and we block */
Akinobu Mita8e130592006-06-26 00:24:37 -0700311 list_add_tail(&dquot->dq_inuse, &inuse_list);
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400312 dqstats_inc(DQST_ALLOC_DQUOTS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313}
314
315static inline void remove_inuse(struct dquot *dquot)
316{
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400317 dqstats_dec(DQST_ALLOC_DQUOTS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 list_del(&dquot->dq_inuse);
319}
320/*
321 * End of list functions needing dq_list_lock
322 */
323
324static void wait_on_dquot(struct dquot *dquot)
325{
Ingo Molnard3be9152006-03-23 03:00:29 -0800326 mutex_lock(&dquot->dq_lock);
327 mutex_unlock(&dquot->dq_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328}
329
Jan Kara03f6e922008-04-28 02:14:32 -0700330static inline int dquot_dirty(struct dquot *dquot)
331{
332 return test_bit(DQ_MOD_B, &dquot->dq_flags);
333}
334
335static inline int mark_dquot_dirty(struct dquot *dquot)
336{
337 return dquot->dq_sb->dq_op->mark_dirty(dquot);
338}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Dmitry Monakhoveabf2902010-03-27 15:15:38 +0300340/* Mark dquot dirty in atomic manner, and return it's old dirty flag state */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341int dquot_mark_dquot_dirty(struct dquot *dquot)
342{
Dmitry Monakhoveabf2902010-03-27 15:15:38 +0300343 int ret = 1;
344
345 /* If quota is dirty already, we don't have to acquire dq_list_lock */
346 if (test_bit(DQ_MOD_B, &dquot->dq_flags))
347 return 1;
348
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 spin_lock(&dq_list_lock);
Dmitry Monakhoveabf2902010-03-27 15:15:38 +0300350 if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700352 info[dquot->dq_id.type].dqi_dirty_list);
Dmitry Monakhoveabf2902010-03-27 15:15:38 +0300353 ret = 0;
354 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 spin_unlock(&dq_list_lock);
Dmitry Monakhoveabf2902010-03-27 15:15:38 +0300356 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357}
Mingming Cao08d03502009-01-14 16:19:32 +0100358EXPORT_SYMBOL(dquot_mark_dquot_dirty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359
Dmitry Monakhovdc52dd32009-12-14 15:21:15 +0300360/* Dirtify all the dquots - this can block when journalling */
361static inline int mark_all_dquot_dirty(struct dquot * const *dquot)
362{
363 int ret, err, cnt;
364
365 ret = err = 0;
366 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
367 if (dquot[cnt])
368 /* Even in case of error we have to continue */
369 ret = mark_dquot_dirty(dquot[cnt]);
370 if (!err)
371 err = ret;
372 }
373 return err;
374}
375
376static inline void dqput_all(struct dquot **dquot)
377{
378 unsigned int cnt;
379
380 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
381 dqput(dquot[cnt]);
382}
383
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384/* This function needs dq_list_lock */
385static inline int clear_dquot_dirty(struct dquot *dquot)
386{
387 if (!test_and_clear_bit(DQ_MOD_B, &dquot->dq_flags))
388 return 0;
389 list_del_init(&dquot->dq_dirty);
390 return 1;
391}
392
393void mark_info_dirty(struct super_block *sb, int type)
394{
395 set_bit(DQF_INFO_DIRTY_B, &sb_dqopt(sb)->info[type].dqi_flags);
396}
397EXPORT_SYMBOL(mark_info_dirty);
398
399/*
400 * Read dquot from disk and alloc space for it
401 */
402
403int dquot_acquire(struct dquot *dquot)
404{
405 int ret = 0, ret2 = 0;
406 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
407
Ingo Molnard3be9152006-03-23 03:00:29 -0800408 mutex_lock(&dquot->dq_lock);
409 mutex_lock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 if (!test_bit(DQ_READ_B, &dquot->dq_flags))
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700411 ret = dqopt->ops[dquot->dq_id.type]->read_dqblk(dquot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 if (ret < 0)
413 goto out_iolock;
414 set_bit(DQ_READ_B, &dquot->dq_flags);
415 /* Instantiate dquot if needed */
416 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && !dquot->dq_off) {
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700417 ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 /* Write the info if needed */
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700419 if (info_dirty(&dqopt->info[dquot->dq_id.type])) {
420 ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info(
421 dquot->dq_sb, dquot->dq_id.type);
Jan Kara268157b2009-01-27 15:47:22 +0100422 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 if (ret < 0)
424 goto out_iolock;
425 if (ret2 < 0) {
426 ret = ret2;
427 goto out_iolock;
428 }
429 }
430 set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
431out_iolock:
Ingo Molnard3be9152006-03-23 03:00:29 -0800432 mutex_unlock(&dqopt->dqio_mutex);
433 mutex_unlock(&dquot->dq_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 return ret;
435}
Mingming Cao08d03502009-01-14 16:19:32 +0100436EXPORT_SYMBOL(dquot_acquire);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
438/*
439 * Write dquot to disk
440 */
441int dquot_commit(struct dquot *dquot)
442{
Jan Karab03f2452011-03-31 18:36:52 +0200443 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
445
Ingo Molnard3be9152006-03-23 03:00:29 -0800446 mutex_lock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 spin_lock(&dq_list_lock);
448 if (!clear_dquot_dirty(dquot)) {
449 spin_unlock(&dq_list_lock);
450 goto out_sem;
451 }
452 spin_unlock(&dq_list_lock);
453 /* Inactive dquot can be only if there was error during read/init
454 * => we have better not writing it */
Jan Karab03f2452011-03-31 18:36:52 +0200455 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700456 ret = dqopt->ops[dquot->dq_id.type]->commit_dqblk(dquot);
Jan Karab03f2452011-03-31 18:36:52 +0200457 else
458 ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459out_sem:
Ingo Molnard3be9152006-03-23 03:00:29 -0800460 mutex_unlock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 return ret;
462}
Mingming Cao08d03502009-01-14 16:19:32 +0100463EXPORT_SYMBOL(dquot_commit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
465/*
466 * Release dquot
467 */
468int dquot_release(struct dquot *dquot)
469{
470 int ret = 0, ret2 = 0;
471 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
472
Ingo Molnard3be9152006-03-23 03:00:29 -0800473 mutex_lock(&dquot->dq_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 /* Check whether we are not racing with some other dqget() */
475 if (atomic_read(&dquot->dq_count) > 1)
476 goto out_dqlock;
Ingo Molnard3be9152006-03-23 03:00:29 -0800477 mutex_lock(&dqopt->dqio_mutex);
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700478 if (dqopt->ops[dquot->dq_id.type]->release_dqblk) {
479 ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 /* Write the info */
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700481 if (info_dirty(&dqopt->info[dquot->dq_id.type])) {
482 ret2 = dqopt->ops[dquot->dq_id.type]->write_file_info(
483 dquot->dq_sb, dquot->dq_id.type);
Jan Kara268157b2009-01-27 15:47:22 +0100484 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 if (ret >= 0)
486 ret = ret2;
487 }
488 clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
Ingo Molnard3be9152006-03-23 03:00:29 -0800489 mutex_unlock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490out_dqlock:
Ingo Molnard3be9152006-03-23 03:00:29 -0800491 mutex_unlock(&dquot->dq_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 return ret;
493}
Mingming Cao08d03502009-01-14 16:19:32 +0100494EXPORT_SYMBOL(dquot_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495
Jan Kara7d9056b2008-11-25 15:31:32 +0100496void dquot_destroy(struct dquot *dquot)
Jan Kara74f783a2008-08-19 14:51:22 +0200497{
498 kmem_cache_free(dquot_cachep, dquot);
499}
Jan Kara7d9056b2008-11-25 15:31:32 +0100500EXPORT_SYMBOL(dquot_destroy);
Jan Kara74f783a2008-08-19 14:51:22 +0200501
502static inline void do_destroy_dquot(struct dquot *dquot)
503{
504 dquot->dq_sb->dq_op->destroy_dquot(dquot);
505}
506
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507/* Invalidate all dquots on the list. Note that this function is called after
508 * quota is disabled and pointers from inodes removed so there cannot be new
Jan Kara6362e4d2006-03-23 03:00:17 -0800509 * quota users. There can still be some users of quotas due to inodes being
510 * just deleted or pruned by prune_icache() (those are not attached to any
Jan Karacc334122009-01-12 17:23:05 +0100511 * list) or parallel quotactl call. We have to wait for such users.
Jan Kara6362e4d2006-03-23 03:00:17 -0800512 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513static void invalidate_dquots(struct super_block *sb, int type)
514{
Domen Puncerc33ed272005-06-25 14:59:36 -0700515 struct dquot *dquot, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
Jan Kara6362e4d2006-03-23 03:00:17 -0800517restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 spin_lock(&dq_list_lock);
Domen Puncerc33ed272005-06-25 14:59:36 -0700519 list_for_each_entry_safe(dquot, tmp, &inuse_list, dq_inuse) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 if (dquot->dq_sb != sb)
521 continue;
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700522 if (dquot->dq_id.type != type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 continue;
Jan Kara6362e4d2006-03-23 03:00:17 -0800524 /* Wait for dquot users */
525 if (atomic_read(&dquot->dq_count)) {
526 DEFINE_WAIT(wait);
527
Jan Kara9f985cb2014-04-03 14:46:55 -0700528 dqgrab(dquot);
Jan Kara6362e4d2006-03-23 03:00:17 -0800529 prepare_to_wait(&dquot->dq_wait_unused, &wait,
530 TASK_UNINTERRUPTIBLE);
531 spin_unlock(&dq_list_lock);
532 /* Once dqput() wakes us up, we know it's time to free
533 * the dquot.
534 * IMPORTANT: we rely on the fact that there is always
535 * at most one process waiting for dquot to free.
536 * Otherwise dq_count would be > 1 and we would never
537 * wake up.
538 */
539 if (atomic_read(&dquot->dq_count) > 1)
540 schedule();
541 finish_wait(&dquot->dq_wait_unused, &wait);
542 dqput(dquot);
543 /* At this moment dquot() need not exist (it could be
544 * reclaimed by prune_dqcache(). Hence we must
545 * restart. */
546 goto restart;
547 }
548 /*
549 * Quota now has no users and it has been written on last
550 * dqput()
551 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 remove_dquot_hash(dquot);
553 remove_free_dquot(dquot);
554 remove_inuse(dquot);
Jan Kara74f783a2008-08-19 14:51:22 +0200555 do_destroy_dquot(dquot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 }
557 spin_unlock(&dq_list_lock);
558}
559
Jan Kara12c77522008-10-20 17:05:00 +0200560/* Call callback for every active dquot on given filesystem */
561int dquot_scan_active(struct super_block *sb,
562 int (*fn)(struct dquot *dquot, unsigned long priv),
563 unsigned long priv)
564{
565 struct dquot *dquot, *old_dquot = NULL;
566 int ret = 0;
567
568 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
569 spin_lock(&dq_list_lock);
570 list_for_each_entry(dquot, &inuse_list, dq_inuse) {
571 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
572 continue;
573 if (dquot->dq_sb != sb)
574 continue;
575 /* Now we have active dquot so we can just increase use count */
576 atomic_inc(&dquot->dq_count);
Jan Kara12c77522008-10-20 17:05:00 +0200577 spin_unlock(&dq_list_lock);
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400578 dqstats_inc(DQST_LOOKUPS);
Jan Kara12c77522008-10-20 17:05:00 +0200579 dqput(old_dquot);
580 old_dquot = dquot;
Jan Kara1362f4e2014-02-20 17:02:27 +0100581 /*
582 * ->release_dquot() can be racing with us. Our reference
583 * protects us from new calls to it so just wait for any
584 * outstanding call and recheck the DQ_ACTIVE_B after that.
585 */
586 wait_on_dquot(dquot);
587 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
588 ret = fn(dquot, priv);
589 if (ret < 0)
590 goto out;
591 }
Jan Kara12c77522008-10-20 17:05:00 +0200592 spin_lock(&dq_list_lock);
593 /* We are safe to continue now because our dquot could not
594 * be moved out of the inuse list while we hold the reference */
595 }
596 spin_unlock(&dq_list_lock);
597out:
598 dqput(old_dquot);
599 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
600 return ret;
601}
Mingming Cao08d03502009-01-14 16:19:32 +0100602EXPORT_SYMBOL(dquot_scan_active);
Jan Kara12c77522008-10-20 17:05:00 +0200603
Jan Karaceed1722012-07-03 16:45:28 +0200604/* Write all dquot structures to quota files */
605int dquot_writeback_dquots(struct super_block *sb, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606{
607 struct list_head *dirty;
608 struct dquot *dquot;
609 struct quota_info *dqopt = sb_dqopt(sb);
610 int cnt;
Jan Karaceed1722012-07-03 16:45:28 +0200611 int err, ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612
Ingo Molnard3be9152006-03-23 03:00:29 -0800613 mutex_lock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
615 if (type != -1 && cnt != type)
616 continue;
Jan Karaf55abc02008-08-20 17:50:32 +0200617 if (!sb_has_quota_active(sb, cnt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 continue;
619 spin_lock(&dq_list_lock);
620 dirty = &dqopt->info[cnt].dqi_dirty_list;
621 while (!list_empty(dirty)) {
Jan Kara268157b2009-01-27 15:47:22 +0100622 dquot = list_first_entry(dirty, struct dquot,
623 dq_dirty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 /* Dirty and inactive can be only bad dquot... */
625 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
626 clear_dquot_dirty(dquot);
627 continue;
628 }
629 /* Now we have active dquot from which someone is
630 * holding reference so we can safely just increase
631 * use count */
Jan Kara9f985cb2014-04-03 14:46:55 -0700632 dqgrab(dquot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 spin_unlock(&dq_list_lock);
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400634 dqstats_inc(DQST_LOOKUPS);
Jan Karaceed1722012-07-03 16:45:28 +0200635 err = sb->dq_op->write_dquot(dquot);
636 if (!ret && err)
637 err = ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 dqput(dquot);
639 spin_lock(&dq_list_lock);
640 }
641 spin_unlock(&dq_list_lock);
642 }
643
644 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
Jan Karaf55abc02008-08-20 17:50:32 +0200645 if ((cnt == type || type == -1) && sb_has_quota_active(sb, cnt)
646 && info_dirty(&dqopt->info[cnt]))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 sb->dq_op->write_info(sb, cnt);
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400648 dqstats_inc(DQST_SYNCS);
Ingo Molnard3be9152006-03-23 03:00:29 -0800649 mutex_unlock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650
Jan Karaceed1722012-07-03 16:45:28 +0200651 return ret;
652}
653EXPORT_SYMBOL(dquot_writeback_dquots);
654
655/* Write all dquot structures to disk and make them visible from userspace */
656int dquot_quota_sync(struct super_block *sb, int type)
657{
658 struct quota_info *dqopt = sb_dqopt(sb);
659 int cnt;
660 int ret;
661
662 ret = dquot_writeback_dquots(sb, type);
663 if (ret)
664 return ret;
665 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
Christoph Hellwig5fb324a2010-02-16 03:44:52 -0500666 return 0;
667
668 /* This is not very clever (and fast) but currently I don't know about
669 * any other simple way of getting quota data to disk and we must get
670 * them there for userspace to be visible... */
671 if (sb->s_op->sync_fs)
672 sb->s_op->sync_fs(sb, 1);
673 sync_blockdev(sb->s_bdev);
674
675 /*
676 * Now when everything is written we can discard the pagecache so
677 * that userspace sees the changes.
678 */
Jan Karaf9ef1782012-04-25 21:10:31 +0200679 mutex_lock(&dqopt->dqonoff_mutex);
Christoph Hellwig5fb324a2010-02-16 03:44:52 -0500680 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
681 if (type != -1 && cnt != type)
682 continue;
683 if (!sb_has_quota_active(sb, cnt))
684 continue;
Jan Karaa80b12c2012-04-25 21:15:53 +0200685 mutex_lock(&dqopt->files[cnt]->i_mutex);
Jan Karaf9ef1782012-04-25 21:10:31 +0200686 truncate_inode_pages(&dqopt->files[cnt]->i_data, 0);
687 mutex_unlock(&dqopt->files[cnt]->i_mutex);
Christoph Hellwig5fb324a2010-02-16 03:44:52 -0500688 }
Jan Karaf9ef1782012-04-25 21:10:31 +0200689 mutex_unlock(&dqopt->dqonoff_mutex);
Christoph Hellwig5fb324a2010-02-16 03:44:52 -0500690
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 return 0;
692}
Christoph Hellwig287a8092010-05-19 07:16:45 -0400693EXPORT_SYMBOL(dquot_quota_sync);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694
Dave Chinner1ab6c492013-08-28 10:18:09 +1000695static unsigned long
696dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697{
698 struct list_head *head;
699 struct dquot *dquot;
Dave Chinner1ab6c492013-08-28 10:18:09 +1000700 unsigned long freed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
Niu Yaweid68aab6b2014-06-04 12:22:13 +0800702 spin_lock(&dq_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 head = free_dquots.prev;
Dave Chinner1ab6c492013-08-28 10:18:09 +1000704 while (head != &free_dquots && sc->nr_to_scan) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 dquot = list_entry(head, struct dquot, dq_free);
706 remove_dquot_hash(dquot);
707 remove_free_dquot(dquot);
708 remove_inuse(dquot);
Jan Kara74f783a2008-08-19 14:51:22 +0200709 do_destroy_dquot(dquot);
Dave Chinner1ab6c492013-08-28 10:18:09 +1000710 sc->nr_to_scan--;
711 freed++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 head = free_dquots.prev;
713 }
Niu Yaweid68aab6b2014-06-04 12:22:13 +0800714 spin_unlock(&dq_list_lock);
Dave Chinner1ab6c492013-08-28 10:18:09 +1000715 return freed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716}
717
Dave Chinner1ab6c492013-08-28 10:18:09 +1000718static unsigned long
719dqcache_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720{
Glauber Costa55f841c2013-08-28 10:17:53 +1000721 return vfs_pressure_ratio(
722 percpu_counter_read_positive(&dqstats.counter[DQST_FREE_DQUOTS]));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723}
724
Rusty Russell8e1f9362007-07-17 04:03:17 -0700725static struct shrinker dqcache_shrinker = {
Dave Chinner1ab6c492013-08-28 10:18:09 +1000726 .count_objects = dqcache_shrink_count,
727 .scan_objects = dqcache_shrink_scan,
Rusty Russell8e1f9362007-07-17 04:03:17 -0700728 .seeks = DEFAULT_SEEKS,
729};
730
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731/*
732 * Put reference to dquot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 */
Jan Kara3d9ea252008-10-10 16:12:23 +0200734void dqput(struct dquot *dquot)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735{
Jan Karab48d3802008-07-25 01:46:49 -0700736 int ret;
737
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 if (!dquot)
739 return;
Jan Kara62af9b52010-04-19 16:47:20 +0200740#ifdef CONFIG_QUOTA_DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 if (!atomic_read(&dquot->dq_count)) {
Jiaying Zhangfb5ffb02010-07-20 16:54:43 +0200742 quota_error(dquot->dq_sb, "trying to free free dquot of %s %d",
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700743 quotatypes[dquot->dq_id.type],
744 from_kqid(&init_user_ns, dquot->dq_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 BUG();
746 }
747#endif
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400748 dqstats_inc(DQST_DROPS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749we_slept:
750 spin_lock(&dq_list_lock);
751 if (atomic_read(&dquot->dq_count) > 1) {
752 /* We have more than one user... nothing to do */
753 atomic_dec(&dquot->dq_count);
Jan Kara6362e4d2006-03-23 03:00:17 -0800754 /* Releasing dquot during quotaoff phase? */
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700755 if (!sb_has_quota_active(dquot->dq_sb, dquot->dq_id.type) &&
Jan Kara6362e4d2006-03-23 03:00:17 -0800756 atomic_read(&dquot->dq_count) == 1)
757 wake_up(&dquot->dq_wait_unused);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 spin_unlock(&dq_list_lock);
759 return;
760 }
761 /* Need to release dquot? */
762 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) {
763 spin_unlock(&dq_list_lock);
764 /* Commit dquot before releasing */
Jan Karab48d3802008-07-25 01:46:49 -0700765 ret = dquot->dq_sb->dq_op->write_dquot(dquot);
766 if (ret < 0) {
Jiaying Zhangfb5ffb02010-07-20 16:54:43 +0200767 quota_error(dquot->dq_sb, "Can't write quota structure"
768 " (error %d). Quota may get out of sync!",
769 ret);
Jan Karab48d3802008-07-25 01:46:49 -0700770 /*
771 * We clear dirty bit anyway, so that we avoid
772 * infinite loop here
773 */
774 spin_lock(&dq_list_lock);
775 clear_dquot_dirty(dquot);
776 spin_unlock(&dq_list_lock);
777 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 goto we_slept;
779 }
780 /* Clear flag in case dquot was inactive (something bad happened) */
781 clear_dquot_dirty(dquot);
782 if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags)) {
783 spin_unlock(&dq_list_lock);
784 dquot->dq_sb->dq_op->release_dquot(dquot);
785 goto we_slept;
786 }
787 atomic_dec(&dquot->dq_count);
Jan Kara62af9b52010-04-19 16:47:20 +0200788#ifdef CONFIG_QUOTA_DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 /* sanity check */
Eric Sesterhenn8abf6a42006-04-02 13:36:13 +0200790 BUG_ON(!list_empty(&dquot->dq_free));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791#endif
792 put_dquot_last(dquot);
793 spin_unlock(&dq_list_lock);
794}
Mingming Cao08d03502009-01-14 16:19:32 +0100795EXPORT_SYMBOL(dqput);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796
Jan Kara7d9056b2008-11-25 15:31:32 +0100797struct dquot *dquot_alloc(struct super_block *sb, int type)
Jan Kara74f783a2008-08-19 14:51:22 +0200798{
799 return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
800}
Jan Kara7d9056b2008-11-25 15:31:32 +0100801EXPORT_SYMBOL(dquot_alloc);
Jan Kara74f783a2008-08-19 14:51:22 +0200802
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803static struct dquot *get_empty_dquot(struct super_block *sb, int type)
804{
805 struct dquot *dquot;
806
Jan Kara74f783a2008-08-19 14:51:22 +0200807 dquot = sb->dq_op->alloc_dquot(sb, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 if(!dquot)
Jan Karadd6f3c62009-01-26 16:01:43 +0100809 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810
Ingo Molnard3be9152006-03-23 03:00:29 -0800811 mutex_init(&dquot->dq_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 INIT_LIST_HEAD(&dquot->dq_free);
813 INIT_LIST_HEAD(&dquot->dq_inuse);
814 INIT_HLIST_NODE(&dquot->dq_hash);
815 INIT_LIST_HEAD(&dquot->dq_dirty);
Jan Kara6362e4d2006-03-23 03:00:17 -0800816 init_waitqueue_head(&dquot->dq_wait_unused);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 dquot->dq_sb = sb;
Eric W. Biederman1a06d422012-09-16 05:45:30 -0700818 dquot->dq_id = make_kqid_invalid(type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 atomic_set(&dquot->dq_count, 1);
820
821 return dquot;
822}
823
824/*
825 * Get reference to dquot
Jan Karacc334122009-01-12 17:23:05 +0100826 *
827 * Locking is slightly tricky here. We are guarded from parallel quotaoff()
828 * destroying our dquot by:
829 * a) checking for quota flags under dq_list_lock and
830 * b) getting a reference to dquot before we release dq_list_lock
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 */
Eric W. Biedermanaca645a2012-09-16 03:11:50 -0700832struct dquot *dqget(struct super_block *sb, struct kqid qid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833{
Eric W. Biederman1a06d422012-09-16 05:45:30 -0700834 unsigned int hashent = hashfn(sb, qid);
Jan Karadd6f3c62009-01-26 16:01:43 +0100835 struct dquot *dquot = NULL, *empty = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836
Eric W. Biederman1a06d422012-09-16 05:45:30 -0700837 if (!sb_has_quota_active(sb, qid.type))
Jan Karadd6f3c62009-01-26 16:01:43 +0100838 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839we_slept:
840 spin_lock(&dq_list_lock);
Jan Karacc334122009-01-12 17:23:05 +0100841 spin_lock(&dq_state_lock);
Eric W. Biederman1a06d422012-09-16 05:45:30 -0700842 if (!sb_has_quota_active(sb, qid.type)) {
Jan Karacc334122009-01-12 17:23:05 +0100843 spin_unlock(&dq_state_lock);
844 spin_unlock(&dq_list_lock);
845 goto out;
846 }
847 spin_unlock(&dq_state_lock);
848
Eric W. Biederman1a06d422012-09-16 05:45:30 -0700849 dquot = find_dquot(hashent, sb, qid);
Jan Karadd6f3c62009-01-26 16:01:43 +0100850 if (!dquot) {
851 if (!empty) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 spin_unlock(&dq_list_lock);
Eric W. Biederman1a06d422012-09-16 05:45:30 -0700853 empty = get_empty_dquot(sb, qid.type);
Jan Karadd6f3c62009-01-26 16:01:43 +0100854 if (!empty)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 schedule(); /* Try to wait for a moment... */
856 goto we_slept;
857 }
858 dquot = empty;
Jan Karadd6f3c62009-01-26 16:01:43 +0100859 empty = NULL;
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700860 dquot->dq_id = qid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 /* all dquots go on the inuse_list */
862 put_inuse(dquot);
863 /* hash it first so it can be found */
864 insert_dquot_hash(dquot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 spin_unlock(&dq_list_lock);
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400866 dqstats_inc(DQST_LOOKUPS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 } else {
868 if (!atomic_read(&dquot->dq_count))
869 remove_free_dquot(dquot);
870 atomic_inc(&dquot->dq_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 spin_unlock(&dq_list_lock);
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400872 dqstats_inc(DQST_CACHE_HITS);
873 dqstats_inc(DQST_LOOKUPS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 }
Jan Kara268157b2009-01-27 15:47:22 +0100875 /* Wait for dq_lock - after this we know that either dquot_release() is
876 * already finished or it will be canceled due to dq_count > 1 test */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 wait_on_dquot(dquot);
Jan Kara268157b2009-01-27 15:47:22 +0100878 /* Read the dquot / allocate space in quota file */
879 if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags) &&
880 sb->dq_op->acquire_dquot(dquot) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 dqput(dquot);
Jan Karadd6f3c62009-01-26 16:01:43 +0100882 dquot = NULL;
Jan Karacc334122009-01-12 17:23:05 +0100883 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 }
Jan Kara62af9b52010-04-19 16:47:20 +0200885#ifdef CONFIG_QUOTA_DEBUG
Eric Sesterhenn8abf6a42006-04-02 13:36:13 +0200886 BUG_ON(!dquot->dq_sb); /* Has somebody invalidated entry under us? */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887#endif
Jan Karacc334122009-01-12 17:23:05 +0100888out:
889 if (empty)
890 do_destroy_dquot(empty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891
892 return dquot;
893}
Mingming Cao08d03502009-01-14 16:19:32 +0100894EXPORT_SYMBOL(dqget);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895
896static int dqinit_needed(struct inode *inode, int type)
897{
898 int cnt;
899
900 if (IS_NOQUOTA(inode))
901 return 0;
902 if (type != -1)
Jan Karadd6f3c62009-01-26 16:01:43 +0100903 return !inode->i_dquot[type];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
Jan Karadd6f3c62009-01-26 16:01:43 +0100905 if (!inode->i_dquot[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 return 1;
907 return 0;
908}
909
Ingo Molnard3be9152006-03-23 03:00:29 -0800910/* This routine is guarded by dqonoff_mutex mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911static void add_dquot_ref(struct super_block *sb, int type)
912{
Jan Kara941d2382008-02-06 01:37:36 -0800913 struct inode *inode, *old_inode = NULL;
Jan Kara62af9b52010-04-19 16:47:20 +0200914#ifdef CONFIG_QUOTA_DEBUG
Jan Kara0a5a9c72010-02-09 18:20:39 +0100915 int reserved = 0;
Jan Kara4c5e6c02010-04-06 18:52:47 +0200916#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917
Dave Chinner55fa6092011-03-22 22:23:40 +1100918 spin_lock(&inode_sb_list_lock);
Christoph Hellwigd003fb72007-02-12 00:51:58 -0800919 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
Dave Chinner250df6e2011-03-22 22:23:36 +1100920 spin_lock(&inode->i_lock);
921 if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
922 !atomic_read(&inode->i_writecount) ||
923 !dqinit_needed(inode, type)) {
924 spin_unlock(&inode->i_lock);
Nick Pigginaabb8fd2009-03-11 13:17:36 -0700925 continue;
Dave Chinner250df6e2011-03-22 22:23:36 +1100926 }
Christoph Hellwigd003fb72007-02-12 00:51:58 -0800927 __iget(inode);
Dave Chinner250df6e2011-03-22 22:23:36 +1100928 spin_unlock(&inode->i_lock);
Dave Chinner55fa6092011-03-22 22:23:40 +1100929 spin_unlock(&inode_sb_list_lock);
Christoph Hellwigd003fb72007-02-12 00:51:58 -0800930
Jan Karad7e97112012-04-24 17:08:41 +0200931#ifdef CONFIG_QUOTA_DEBUG
932 if (unlikely(inode_get_rsv_space(inode) > 0))
933 reserved = 1;
934#endif
Jan Kara941d2382008-02-06 01:37:36 -0800935 iput(old_inode);
Christoph Hellwig871a2932010-03-03 09:05:07 -0500936 __dquot_initialize(inode, type);
Dave Chinner55fa6092011-03-22 22:23:40 +1100937
938 /*
939 * We hold a reference to 'inode' so it couldn't have been
940 * removed from s_inodes list while we dropped the
941 * inode_sb_list_lock We cannot iput the inode now as we can be
942 * holding the last reference and we cannot iput it under
943 * inode_sb_list_lock. So we keep the reference and iput it
944 * later.
945 */
Jan Kara941d2382008-02-06 01:37:36 -0800946 old_inode = inode;
Dave Chinner55fa6092011-03-22 22:23:40 +1100947 spin_lock(&inode_sb_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 }
Dave Chinner55fa6092011-03-22 22:23:40 +1100949 spin_unlock(&inode_sb_list_lock);
Jan Kara941d2382008-02-06 01:37:36 -0800950 iput(old_inode);
Jan Kara0a5a9c72010-02-09 18:20:39 +0100951
Jan Kara62af9b52010-04-19 16:47:20 +0200952#ifdef CONFIG_QUOTA_DEBUG
Jan Kara0a5a9c72010-02-09 18:20:39 +0100953 if (reserved) {
Jiaying Zhangfb5ffb02010-07-20 16:54:43 +0200954 quota_error(sb, "Writes happened before quota was turned on "
955 "thus quota information is probably inconsistent. "
956 "Please run quotacheck(8)");
Jan Kara0a5a9c72010-02-09 18:20:39 +0100957 }
Jan Kara4c5e6c02010-04-06 18:52:47 +0200958#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959}
960
Jan Kara268157b2009-01-27 15:47:22 +0100961/*
Jan Kara268157b2009-01-27 15:47:22 +0100962 * Remove references to dquots from inode and add dquot to list for freeing
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300963 * if we have the last reference to dquot
Jan Kara268157b2009-01-27 15:47:22 +0100964 */
Niu Yawei9eb64632014-06-04 12:21:30 +0800965static void remove_inode_dquot_ref(struct inode *inode, int type,
966 struct list_head *tofree_head)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967{
968 struct dquot *dquot = inode->i_dquot[type];
969
Jan Karadd6f3c62009-01-26 16:01:43 +0100970 inode->i_dquot[type] = NULL;
Niu Yawei9eb64632014-06-04 12:21:30 +0800971 if (!dquot)
972 return;
973
974 if (list_empty(&dquot->dq_free)) {
975 /*
976 * The inode still has reference to dquot so it can't be in the
977 * free list
978 */
979 spin_lock(&dq_list_lock);
980 list_add(&dquot->dq_free, tofree_head);
981 spin_unlock(&dq_list_lock);
982 } else {
983 /*
984 * Dquot is already in a list to put so we won't drop the last
985 * reference here.
986 */
987 dqput(dquot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989}
990
Jan Kara268157b2009-01-27 15:47:22 +0100991/*
992 * Free list of dquots
993 * Dquots are removed from inodes and no new references can be got so we are
994 * the only ones holding reference
995 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996static void put_dquot_list(struct list_head *tofree_head)
997{
998 struct list_head *act_head;
999 struct dquot *dquot;
1000
1001 act_head = tofree_head->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 while (act_head != tofree_head) {
1003 dquot = list_entry(act_head, struct dquot, dq_free);
1004 act_head = act_head->next;
Jan Kara268157b2009-01-27 15:47:22 +01001005 /* Remove dquot from the list so we won't have problems... */
1006 list_del_init(&dquot->dq_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 dqput(dquot);
1008 }
1009}
1010
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001011static void remove_dquot_ref(struct super_block *sb, int type,
1012 struct list_head *tofree_head)
1013{
1014 struct inode *inode;
Dmitry Monakhov7af9cce2010-06-01 11:39:48 +04001015 int reserved = 0;
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001016
Dave Chinner55fa6092011-03-22 22:23:40 +11001017 spin_lock(&inode_sb_list_lock);
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001018 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
Nick Pigginaabb8fd2009-03-11 13:17:36 -07001019 /*
1020 * We have to scan also I_NEW inodes because they can already
1021 * have quota pointer initialized. Luckily, we need to touch
1022 * only quota pointers and these have separate locking
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001023 * (dq_data_lock).
Nick Pigginaabb8fd2009-03-11 13:17:36 -07001024 */
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001025 spin_lock(&dq_data_lock);
Dmitry Monakhov7af9cce2010-06-01 11:39:48 +04001026 if (!IS_NOQUOTA(inode)) {
1027 if (unlikely(inode_get_rsv_space(inode) > 0))
1028 reserved = 1;
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001029 remove_inode_dquot_ref(inode, type, tofree_head);
Dmitry Monakhov7af9cce2010-06-01 11:39:48 +04001030 }
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001031 spin_unlock(&dq_data_lock);
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001032 }
Dave Chinner55fa6092011-03-22 22:23:40 +11001033 spin_unlock(&inode_sb_list_lock);
Dmitry Monakhov7af9cce2010-06-01 11:39:48 +04001034#ifdef CONFIG_QUOTA_DEBUG
1035 if (reserved) {
1036 printk(KERN_WARNING "VFS (%s): Writes happened after quota"
1037 " was disabled thus quota information is probably "
1038 "inconsistent. Please run quotacheck(8).\n", sb->s_id);
1039 }
1040#endif
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001041}
1042
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043/* Gather all references from inodes and drop them */
1044static void drop_dquot_ref(struct super_block *sb, int type)
1045{
1046 LIST_HEAD(tofree_head);
1047
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001048 if (sb->dq_op) {
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001049 remove_dquot_ref(sb, type, &tofree_head);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001050 synchronize_srcu(&dquot_srcu);
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001051 put_dquot_list(&tofree_head);
1052 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053}
1054
Jan Kara12095462008-08-20 14:45:12 +02001055static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056{
1057 dquot->dq_dqb.dqb_curinodes += number;
1058}
1059
1060static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
1061{
1062 dquot->dq_dqb.dqb_curspace += number;
1063}
1064
Mingming Caof18df222009-01-13 16:43:09 +01001065static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
1066{
1067 dquot->dq_dqb.dqb_rsvspace += number;
1068}
1069
Mingming Cao740d9dc2009-01-13 16:43:14 +01001070/*
1071 * Claim reserved quota space
1072 */
Jan Kara0a5a9c72010-02-09 18:20:39 +01001073static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number)
Mingming Cao740d9dc2009-01-13 16:43:14 +01001074{
Jan Kara0a5a9c72010-02-09 18:20:39 +01001075 if (dquot->dq_dqb.dqb_rsvspace < number) {
1076 WARN_ON_ONCE(1);
1077 number = dquot->dq_dqb.dqb_rsvspace;
1078 }
Mingming Cao740d9dc2009-01-13 16:43:14 +01001079 dquot->dq_dqb.dqb_curspace += number;
1080 dquot->dq_dqb.dqb_rsvspace -= number;
1081}
1082
Jan Kara1c8924e2013-08-17 09:32:32 -04001083static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number)
1084{
1085 if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number))
1086 number = dquot->dq_dqb.dqb_curspace;
1087 dquot->dq_dqb.dqb_rsvspace += number;
1088 dquot->dq_dqb.dqb_curspace -= number;
1089}
1090
Mingming Cao740d9dc2009-01-13 16:43:14 +01001091static inline
1092void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
1093{
Jan Kara0a5a9c72010-02-09 18:20:39 +01001094 if (dquot->dq_dqb.dqb_rsvspace >= number)
1095 dquot->dq_dqb.dqb_rsvspace -= number;
1096 else {
1097 WARN_ON_ONCE(1);
1098 dquot->dq_dqb.dqb_rsvspace = 0;
1099 }
Mingming Cao740d9dc2009-01-13 16:43:14 +01001100}
1101
Jan Kara7a2435d2009-01-27 01:47:11 +01001102static void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103{
Jan Karadb49d2d2008-10-01 18:21:39 +02001104 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
1105 dquot->dq_dqb.dqb_curinodes >= number)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 dquot->dq_dqb.dqb_curinodes -= number;
1107 else
1108 dquot->dq_dqb.dqb_curinodes = 0;
1109 if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
1110 dquot->dq_dqb.dqb_itime = (time_t) 0;
1111 clear_bit(DQ_INODES_B, &dquot->dq_flags);
1112}
1113
Jan Kara7a2435d2009-01-27 01:47:11 +01001114static void dquot_decr_space(struct dquot *dquot, qsize_t number)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115{
Jan Karadb49d2d2008-10-01 18:21:39 +02001116 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
1117 dquot->dq_dqb.dqb_curspace >= number)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 dquot->dq_dqb.dqb_curspace -= number;
1119 else
1120 dquot->dq_dqb.dqb_curspace = 0;
Jan Kara12095462008-08-20 14:45:12 +02001121 if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 dquot->dq_dqb.dqb_btime = (time_t) 0;
1123 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
1124}
1125
Jan Karabf097aa2012-02-14 13:28:01 +01001126struct dquot_warn {
1127 struct super_block *w_sb;
Eric W. Biederman7b9c7322012-09-16 04:05:34 -07001128 struct kqid w_dq_id;
Jan Karabf097aa2012-02-14 13:28:01 +01001129 short w_type;
1130};
1131
Jan Karac5254602007-12-22 14:03:25 -08001132static int warning_issued(struct dquot *dquot, const int warntype)
1133{
1134 int flag = (warntype == QUOTA_NL_BHARDWARN ||
1135 warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
1136 ((warntype == QUOTA_NL_IHARDWARN ||
1137 warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
1138
1139 if (!flag)
1140 return 0;
1141 return test_and_set_bit(flag, &dquot->dq_flags);
1142}
1143
Jan Kara8e893462007-10-16 23:29:31 -07001144#ifdef CONFIG_PRINT_QUOTA_WARNING
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145static int flag_print_warnings = 1;
1146
Jan Karabf097aa2012-02-14 13:28:01 +01001147static int need_print_warning(struct dquot_warn *warn)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148{
1149 if (!flag_print_warnings)
1150 return 0;
1151
Eric W. Biederman7b9c7322012-09-16 04:05:34 -07001152 switch (warn->w_dq_id.type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 case USRQUOTA:
Eric W. Biederman1a06d422012-09-16 05:45:30 -07001154 return uid_eq(current_fsuid(), warn->w_dq_id.uid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 case GRPQUOTA:
Eric W. Biederman7b9c7322012-09-16 04:05:34 -07001156 return in_group_p(warn->w_dq_id.gid);
Jan Kara6c29c502012-10-09 23:30:17 +02001157 case PRJQUOTA: /* Never taken... Just make gcc happy */
1158 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 }
1160 return 0;
1161}
1162
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163/* Print warning to user which exceeded quota */
Jan Karabf097aa2012-02-14 13:28:01 +01001164static void print_warning(struct dquot_warn *warn)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165{
1166 char *msg = NULL;
Peter Zijlstra24ec8392006-12-08 02:36:04 -08001167 struct tty_struct *tty;
Jan Karabf097aa2012-02-14 13:28:01 +01001168 int warntype = warn->w_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169
Jan Kara657d3bf2008-07-25 01:46:52 -07001170 if (warntype == QUOTA_NL_IHARDBELOW ||
1171 warntype == QUOTA_NL_ISOFTBELOW ||
1172 warntype == QUOTA_NL_BHARDBELOW ||
Jan Karabf097aa2012-02-14 13:28:01 +01001173 warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 return;
1175
Peter Zijlstra24ec8392006-12-08 02:36:04 -08001176 tty = get_current_tty();
1177 if (!tty)
Alan Cox452a00d2008-10-13 10:39:13 +01001178 return;
Jan Karabf097aa2012-02-14 13:28:01 +01001179 tty_write_message(tty, warn->w_sb->s_id);
Jan Kara8e893462007-10-16 23:29:31 -07001180 if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
Peter Zijlstra24ec8392006-12-08 02:36:04 -08001181 tty_write_message(tty, ": warning, ");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 else
Peter Zijlstra24ec8392006-12-08 02:36:04 -08001183 tty_write_message(tty, ": write failed, ");
Eric W. Biederman7b9c7322012-09-16 04:05:34 -07001184 tty_write_message(tty, quotatypes[warn->w_dq_id.type]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 switch (warntype) {
Jan Kara8e893462007-10-16 23:29:31 -07001186 case QUOTA_NL_IHARDWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 msg = " file limit reached.\r\n";
1188 break;
Jan Kara8e893462007-10-16 23:29:31 -07001189 case QUOTA_NL_ISOFTLONGWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 msg = " file quota exceeded too long.\r\n";
1191 break;
Jan Kara8e893462007-10-16 23:29:31 -07001192 case QUOTA_NL_ISOFTWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 msg = " file quota exceeded.\r\n";
1194 break;
Jan Kara8e893462007-10-16 23:29:31 -07001195 case QUOTA_NL_BHARDWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 msg = " block limit reached.\r\n";
1197 break;
Jan Kara8e893462007-10-16 23:29:31 -07001198 case QUOTA_NL_BSOFTLONGWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 msg = " block quota exceeded too long.\r\n";
1200 break;
Jan Kara8e893462007-10-16 23:29:31 -07001201 case QUOTA_NL_BSOFTWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 msg = " block quota exceeded.\r\n";
1203 break;
1204 }
Peter Zijlstra24ec8392006-12-08 02:36:04 -08001205 tty_write_message(tty, msg);
Alan Cox452a00d2008-10-13 10:39:13 +01001206 tty_kref_put(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207}
Jan Kara8e893462007-10-16 23:29:31 -07001208#endif
1209
Jan Karabf097aa2012-02-14 13:28:01 +01001210static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot,
1211 int warntype)
1212{
1213 if (warning_issued(dquot, warntype))
1214 return;
1215 warn->w_type = warntype;
1216 warn->w_sb = dquot->dq_sb;
1217 warn->w_dq_id = dquot->dq_id;
Jan Karabf097aa2012-02-14 13:28:01 +01001218}
1219
Mingming Caof18df222009-01-13 16:43:09 +01001220/*
1221 * Write warnings to the console and send warning messages over netlink.
1222 *
Jan Karabf097aa2012-02-14 13:28:01 +01001223 * Note that this function can call into tty and networking code.
Mingming Caof18df222009-01-13 16:43:09 +01001224 */
Jan Karabf097aa2012-02-14 13:28:01 +01001225static void flush_warnings(struct dquot_warn *warn)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226{
1227 int i;
1228
Steven Whitehouse86e931a2009-09-28 12:35:17 +01001229 for (i = 0; i < MAXQUOTAS; i++) {
Jan Karabf097aa2012-02-14 13:28:01 +01001230 if (warn[i].w_type == QUOTA_NL_NOWARN)
1231 continue;
Jan Kara8e893462007-10-16 23:29:31 -07001232#ifdef CONFIG_PRINT_QUOTA_WARNING
Jan Karabf097aa2012-02-14 13:28:01 +01001233 print_warning(&warn[i]);
Jan Kara8e893462007-10-16 23:29:31 -07001234#endif
Eric W. Biederman7b9c7322012-09-16 04:05:34 -07001235 quota_send_warning(warn[i].w_dq_id,
Jan Karabf097aa2012-02-14 13:28:01 +01001236 warn[i].w_sb->s_dev, warn[i].w_type);
Steven Whitehouse86e931a2009-09-28 12:35:17 +01001237 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238}
1239
Jan Kara7a2435d2009-01-27 01:47:11 +01001240static int ignore_hardlimit(struct dquot *dquot)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241{
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07001242 struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243
1244 return capable(CAP_SYS_RESOURCE) &&
Jan Kara268157b2009-01-27 15:47:22 +01001245 (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD ||
1246 !(info->dqi_flags & V1_DQF_RSQUASH));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247}
1248
1249/* needs dq_data_lock */
Jan Karabf097aa2012-02-14 13:28:01 +01001250static int check_idq(struct dquot *dquot, qsize_t inodes,
1251 struct dquot_warn *warn)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252{
Jan Kara268157b2009-01-27 15:47:22 +01001253 qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes;
1254
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07001255 if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) ||
Jan Karaf55abc02008-08-20 17:50:32 +02001256 test_bit(DQ_FAKE_B, &dquot->dq_flags))
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001257 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258
1259 if (dquot->dq_dqb.dqb_ihardlimit &&
Jan Kara268157b2009-01-27 15:47:22 +01001260 newinodes > dquot->dq_dqb.dqb_ihardlimit &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 !ignore_hardlimit(dquot)) {
Jan Karabf097aa2012-02-14 13:28:01 +01001262 prepare_warning(warn, dquot, QUOTA_NL_IHARDWARN);
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001263 return -EDQUOT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 }
1265
1266 if (dquot->dq_dqb.dqb_isoftlimit &&
Jan Kara268157b2009-01-27 15:47:22 +01001267 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
1268 dquot->dq_dqb.dqb_itime &&
1269 get_seconds() >= dquot->dq_dqb.dqb_itime &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 !ignore_hardlimit(dquot)) {
Jan Karabf097aa2012-02-14 13:28:01 +01001271 prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN);
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001272 return -EDQUOT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 }
1274
1275 if (dquot->dq_dqb.dqb_isoftlimit &&
Jan Kara268157b2009-01-27 15:47:22 +01001276 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 dquot->dq_dqb.dqb_itime == 0) {
Jan Karabf097aa2012-02-14 13:28:01 +01001278 prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN);
Jan Kara268157b2009-01-27 15:47:22 +01001279 dquot->dq_dqb.dqb_itime = get_seconds() +
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07001280 sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 }
1282
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001283 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284}
1285
1286/* needs dq_data_lock */
Jan Karabf097aa2012-02-14 13:28:01 +01001287static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc,
1288 struct dquot_warn *warn)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289{
Mingming Caof18df222009-01-13 16:43:09 +01001290 qsize_t tspace;
Jan Kara268157b2009-01-27 15:47:22 +01001291 struct super_block *sb = dquot->dq_sb;
Mingming Caof18df222009-01-13 16:43:09 +01001292
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07001293 if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) ||
Jan Karaf55abc02008-08-20 17:50:32 +02001294 test_bit(DQ_FAKE_B, &dquot->dq_flags))
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001295 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296
Mingming Caof18df222009-01-13 16:43:09 +01001297 tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace
1298 + space;
1299
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300 if (dquot->dq_dqb.dqb_bhardlimit &&
Mingming Caof18df222009-01-13 16:43:09 +01001301 tspace > dquot->dq_dqb.dqb_bhardlimit &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 !ignore_hardlimit(dquot)) {
1303 if (!prealloc)
Jan Karabf097aa2012-02-14 13:28:01 +01001304 prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN);
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001305 return -EDQUOT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 }
1307
1308 if (dquot->dq_dqb.dqb_bsoftlimit &&
Mingming Caof18df222009-01-13 16:43:09 +01001309 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
Jan Kara268157b2009-01-27 15:47:22 +01001310 dquot->dq_dqb.dqb_btime &&
1311 get_seconds() >= dquot->dq_dqb.dqb_btime &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 !ignore_hardlimit(dquot)) {
1313 if (!prealloc)
Jan Karabf097aa2012-02-14 13:28:01 +01001314 prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN);
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001315 return -EDQUOT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 }
1317
1318 if (dquot->dq_dqb.dqb_bsoftlimit &&
Mingming Caof18df222009-01-13 16:43:09 +01001319 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 dquot->dq_dqb.dqb_btime == 0) {
1321 if (!prealloc) {
Jan Karabf097aa2012-02-14 13:28:01 +01001322 prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN);
Jan Kara268157b2009-01-27 15:47:22 +01001323 dquot->dq_dqb.dqb_btime = get_seconds() +
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07001324 sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 }
1326 else
1327 /*
1328 * We don't allow preallocation to exceed softlimit so exceeding will
1329 * be always printed
1330 */
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001331 return -EDQUOT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 }
1333
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001334 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335}
1336
Jan Kara12095462008-08-20 14:45:12 +02001337static int info_idq_free(struct dquot *dquot, qsize_t inodes)
Jan Kara657d3bf2008-07-25 01:46:52 -07001338{
Jan Kara268157b2009-01-27 15:47:22 +01001339 qsize_t newinodes;
1340
Jan Kara657d3bf2008-07-25 01:46:52 -07001341 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
Jan Karaf55abc02008-08-20 17:50:32 +02001342 dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit ||
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07001343 !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type))
Jan Kara657d3bf2008-07-25 01:46:52 -07001344 return QUOTA_NL_NOWARN;
1345
Jan Kara268157b2009-01-27 15:47:22 +01001346 newinodes = dquot->dq_dqb.dqb_curinodes - inodes;
1347 if (newinodes <= dquot->dq_dqb.dqb_isoftlimit)
Jan Kara657d3bf2008-07-25 01:46:52 -07001348 return QUOTA_NL_ISOFTBELOW;
1349 if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
Jan Kara268157b2009-01-27 15:47:22 +01001350 newinodes < dquot->dq_dqb.dqb_ihardlimit)
Jan Kara657d3bf2008-07-25 01:46:52 -07001351 return QUOTA_NL_IHARDBELOW;
1352 return QUOTA_NL_NOWARN;
1353}
1354
1355static int info_bdq_free(struct dquot *dquot, qsize_t space)
1356{
1357 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
Jan Kara12095462008-08-20 14:45:12 +02001358 dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
Jan Kara657d3bf2008-07-25 01:46:52 -07001359 return QUOTA_NL_NOWARN;
1360
Jan Kara12095462008-08-20 14:45:12 +02001361 if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit)
Jan Kara657d3bf2008-07-25 01:46:52 -07001362 return QUOTA_NL_BSOFTBELOW;
Jan Kara12095462008-08-20 14:45:12 +02001363 if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit &&
1364 dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit)
Jan Kara657d3bf2008-07-25 01:46:52 -07001365 return QUOTA_NL_BHARDBELOW;
1366 return QUOTA_NL_NOWARN;
1367}
Jan Kara0a5a9c72010-02-09 18:20:39 +01001368
Christoph Hellwig189eef52010-06-04 10:56:29 +02001369static int dquot_active(const struct inode *inode)
1370{
1371 struct super_block *sb = inode->i_sb;
1372
1373 if (IS_NOQUOTA(inode))
1374 return 0;
1375 return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb);
1376}
1377
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378/*
Christoph Hellwig871a2932010-03-03 09:05:07 -05001379 * Initialize quota pointers in inode
1380 *
Christoph Hellwig871a2932010-03-03 09:05:07 -05001381 * It is better to call this function outside of any transaction as it
1382 * might need a lot of space in journal for dquot structure allocation.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 */
Christoph Hellwig871a2932010-03-03 09:05:07 -05001384static void __dquot_initialize(struct inode *inode, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385{
Niu Yawei1ea06be2014-06-04 12:20:30 +08001386 int cnt, init_needed = 0;
Dmitry Monakhovad1e6e82010-02-16 08:31:49 +03001387 struct dquot *got[MAXQUOTAS];
Jan Karacc334122009-01-12 17:23:05 +01001388 struct super_block *sb = inode->i_sb;
Jan Kara0a5a9c72010-02-09 18:20:39 +01001389 qsize_t rsv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390
Christoph Hellwig189eef52010-06-04 10:56:29 +02001391 if (!dquot_active(inode))
Christoph Hellwig871a2932010-03-03 09:05:07 -05001392 return;
Jan Karacc334122009-01-12 17:23:05 +01001393
1394 /* First get references to structures we might need. */
1395 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Eric W. Biedermanaca645a2012-09-16 03:11:50 -07001396 struct kqid qid;
Dmitry Monakhovad1e6e82010-02-16 08:31:49 +03001397 got[cnt] = NULL;
Jan Karacc334122009-01-12 17:23:05 +01001398 if (type != -1 && cnt != type)
1399 continue;
Niu Yawei1ea06be2014-06-04 12:20:30 +08001400 /*
1401 * The i_dquot should have been initialized in most cases,
1402 * we check it without locking here to avoid unnecessary
1403 * dqget()/dqput() calls.
1404 */
1405 if (inode->i_dquot[cnt])
1406 continue;
1407 init_needed = 1;
1408
Jan Karacc334122009-01-12 17:23:05 +01001409 switch (cnt) {
1410 case USRQUOTA:
Eric W. Biedermanaca645a2012-09-16 03:11:50 -07001411 qid = make_kqid_uid(inode->i_uid);
Jan Karacc334122009-01-12 17:23:05 +01001412 break;
1413 case GRPQUOTA:
Eric W. Biedermanaca645a2012-09-16 03:11:50 -07001414 qid = make_kqid_gid(inode->i_gid);
Jan Karacc334122009-01-12 17:23:05 +01001415 break;
1416 }
Eric W. Biedermanaca645a2012-09-16 03:11:50 -07001417 got[cnt] = dqget(sb, qid);
Jan Karacc334122009-01-12 17:23:05 +01001418 }
1419
Niu Yawei1ea06be2014-06-04 12:20:30 +08001420 /* All required i_dquot has been initialized */
1421 if (!init_needed)
1422 return;
1423
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001424 spin_lock(&dq_data_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 if (IS_NOQUOTA(inode))
1426 goto out_err;
1427 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1428 if (type != -1 && cnt != type)
1429 continue;
Jan Karacc334122009-01-12 17:23:05 +01001430 /* Avoid races with quotaoff() */
1431 if (!sb_has_quota_active(sb, cnt))
1432 continue;
Jan Kara4408ea42010-10-19 00:24:21 +02001433 /* We could race with quotaon or dqget() could have failed */
1434 if (!got[cnt])
1435 continue;
Jan Karadd6f3c62009-01-26 16:01:43 +01001436 if (!inode->i_dquot[cnt]) {
Jan Karacc334122009-01-12 17:23:05 +01001437 inode->i_dquot[cnt] = got[cnt];
Jan Karadd6f3c62009-01-26 16:01:43 +01001438 got[cnt] = NULL;
Jan Kara0a5a9c72010-02-09 18:20:39 +01001439 /*
1440 * Make quota reservation system happy if someone
1441 * did a write before quota was turned on
1442 */
1443 rsv = inode_get_rsv_space(inode);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001444 if (unlikely(rsv))
Jan Kara0a5a9c72010-02-09 18:20:39 +01001445 dquot_resv_space(inode->i_dquot[cnt], rsv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446 }
1447 }
1448out_err:
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001449 spin_unlock(&dq_data_lock);
Jan Karacc334122009-01-12 17:23:05 +01001450 /* Drop unused references */
Dmitry Monakhovdc52dd32009-12-14 15:21:15 +03001451 dqput_all(got);
Christoph Hellwig871a2932010-03-03 09:05:07 -05001452}
1453
1454void dquot_initialize(struct inode *inode)
1455{
1456 __dquot_initialize(inode, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457}
Mingming Cao08d03502009-01-14 16:19:32 +01001458EXPORT_SYMBOL(dquot_initialize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459
1460/*
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001461 * Release all quotas referenced by inode.
1462 *
1463 * This function only be called on inode free or converting
1464 * a file to quota file, no other users for the i_dquot in
1465 * both cases, so we needn't call synchronize_srcu() after
1466 * clearing i_dquot.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 */
Christoph Hellwig9f754752010-03-03 09:05:05 -05001468static void __dquot_drop(struct inode *inode)
Jan Kara3d9ea252008-10-10 16:12:23 +02001469{
Jan Karacc334122009-01-12 17:23:05 +01001470 int cnt;
1471 struct dquot *put[MAXQUOTAS];
1472
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001473 spin_lock(&dq_data_lock);
Jan Karacc334122009-01-12 17:23:05 +01001474 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1475 put[cnt] = inode->i_dquot[cnt];
Jan Karadd6f3c62009-01-26 16:01:43 +01001476 inode->i_dquot[cnt] = NULL;
Jan Karacc334122009-01-12 17:23:05 +01001477 }
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001478 spin_unlock(&dq_data_lock);
Dmitry Monakhovdc52dd32009-12-14 15:21:15 +03001479 dqput_all(put);
Christoph Hellwig9f754752010-03-03 09:05:05 -05001480}
1481
1482void dquot_drop(struct inode *inode)
1483{
1484 int cnt;
1485
1486 if (IS_NOQUOTA(inode))
1487 return;
1488
1489 /*
1490 * Test before calling to rule out calls from proc and such
1491 * where we are not allowed to block. Note that this is
1492 * actually reliable test even without the lock - the caller
1493 * must assure that nobody can come after the DQUOT_DROP and
1494 * add quota pointers back anyway.
1495 */
1496 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1497 if (inode->i_dquot[cnt])
1498 break;
1499 }
1500
1501 if (cnt < MAXQUOTAS)
1502 __dquot_drop(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503}
Mingming Cao08d03502009-01-14 16:19:32 +01001504EXPORT_SYMBOL(dquot_drop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505
1506/*
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001507 * inode_reserved_space is managed internally by quota, and protected by
1508 * i_lock similar to i_blocks+i_bytes.
1509 */
1510static qsize_t *inode_reserved_space(struct inode * inode)
1511{
1512 /* Filesystem must explicitly define it's own method in order to use
1513 * quota reservation interface */
1514 BUG_ON(!inode->i_sb->dq_op->get_reserved_space);
1515 return inode->i_sb->dq_op->get_reserved_space(inode);
1516}
1517
Dmitry Monakhovc4690702010-02-09 17:53:36 +01001518void inode_add_rsv_space(struct inode *inode, qsize_t number)
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001519{
1520 spin_lock(&inode->i_lock);
1521 *inode_reserved_space(inode) += number;
1522 spin_unlock(&inode->i_lock);
1523}
Dmitry Monakhovc4690702010-02-09 17:53:36 +01001524EXPORT_SYMBOL(inode_add_rsv_space);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001525
Dmitry Monakhovc4690702010-02-09 17:53:36 +01001526void inode_claim_rsv_space(struct inode *inode, qsize_t number)
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001527{
1528 spin_lock(&inode->i_lock);
1529 *inode_reserved_space(inode) -= number;
1530 __inode_add_bytes(inode, number);
1531 spin_unlock(&inode->i_lock);
1532}
Dmitry Monakhovc4690702010-02-09 17:53:36 +01001533EXPORT_SYMBOL(inode_claim_rsv_space);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001534
Jan Kara1c8924e2013-08-17 09:32:32 -04001535void inode_reclaim_rsv_space(struct inode *inode, qsize_t number)
1536{
1537 spin_lock(&inode->i_lock);
1538 *inode_reserved_space(inode) += number;
1539 __inode_sub_bytes(inode, number);
1540 spin_unlock(&inode->i_lock);
1541}
1542EXPORT_SYMBOL(inode_reclaim_rsv_space);
1543
Dmitry Monakhovc4690702010-02-09 17:53:36 +01001544void inode_sub_rsv_space(struct inode *inode, qsize_t number)
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001545{
1546 spin_lock(&inode->i_lock);
1547 *inode_reserved_space(inode) -= number;
1548 spin_unlock(&inode->i_lock);
1549}
Dmitry Monakhovc4690702010-02-09 17:53:36 +01001550EXPORT_SYMBOL(inode_sub_rsv_space);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001551
1552static qsize_t inode_get_rsv_space(struct inode *inode)
1553{
1554 qsize_t ret;
Jan Kara05b5d892010-01-06 18:03:36 +01001555
1556 if (!inode->i_sb->dq_op->get_reserved_space)
1557 return 0;
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001558 spin_lock(&inode->i_lock);
1559 ret = *inode_reserved_space(inode);
1560 spin_unlock(&inode->i_lock);
1561 return ret;
1562}
1563
1564static void inode_incr_space(struct inode *inode, qsize_t number,
1565 int reserve)
1566{
1567 if (reserve)
1568 inode_add_rsv_space(inode, number);
1569 else
1570 inode_add_bytes(inode, number);
1571}
1572
1573static void inode_decr_space(struct inode *inode, qsize_t number, int reserve)
1574{
1575 if (reserve)
1576 inode_sub_rsv_space(inode, number);
1577 else
1578 inode_sub_bytes(inode, number);
1579}
1580
1581/*
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001582 * This functions updates i_blocks+i_bytes fields and quota information
1583 * (together with appropriate checks).
1584 *
1585 * NOTE: We absolutely rely on the fact that caller dirties the inode
1586 * (usually helpers in quotaops.h care about this) and holds a handle for
1587 * the current transaction so that dquot write and inode write go into the
1588 * same transaction.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589 */
1590
1591/*
1592 * This operation can block, but only after everything is updated
1593 */
Eric Sandeen56246f92010-05-16 09:00:00 -04001594int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595{
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001596 int cnt, ret = 0, index;
Jan Karabf097aa2012-02-14 13:28:01 +01001597 struct dquot_warn warn[MAXQUOTAS];
1598 struct dquot **dquots = inode->i_dquot;
Eric Sandeen56246f92010-05-16 09:00:00 -04001599 int reserve = flags & DQUOT_SPACE_RESERVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600
Christoph Hellwig189eef52010-06-04 10:56:29 +02001601 if (!dquot_active(inode)) {
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001602 inode_incr_space(inode, number, reserve);
1603 goto out;
1604 }
1605
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
Jan Karabf097aa2012-02-14 13:28:01 +01001607 warn[cnt].w_type = QUOTA_NL_NOWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001609 index = srcu_read_lock(&dquot_srcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 spin_lock(&dq_data_lock);
1611 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Jan Karabf097aa2012-02-14 13:28:01 +01001612 if (!dquots[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613 continue;
Jan Karabf097aa2012-02-14 13:28:01 +01001614 ret = check_bdq(dquots[cnt], number,
1615 !(flags & DQUOT_SPACE_WARN), &warn[cnt]);
1616 if (ret && !(flags & DQUOT_SPACE_NOFAIL)) {
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001617 spin_unlock(&dq_data_lock);
1618 goto out_flush_warn;
Mingming Caof18df222009-01-13 16:43:09 +01001619 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 }
1621 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Jan Karabf097aa2012-02-14 13:28:01 +01001622 if (!dquots[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623 continue;
Mingming Caof18df222009-01-13 16:43:09 +01001624 if (reserve)
Jan Karabf097aa2012-02-14 13:28:01 +01001625 dquot_resv_space(dquots[cnt], number);
Mingming Caof18df222009-01-13 16:43:09 +01001626 else
Jan Karabf097aa2012-02-14 13:28:01 +01001627 dquot_incr_space(dquots[cnt], number);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628 }
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001629 inode_incr_space(inode, number, reserve);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 spin_unlock(&dq_data_lock);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001631
1632 if (reserve)
1633 goto out_flush_warn;
Jan Karabf097aa2012-02-14 13:28:01 +01001634 mark_all_dquot_dirty(dquots);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001635out_flush_warn:
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001636 srcu_read_unlock(&dquot_srcu, index);
Jan Karabf097aa2012-02-14 13:28:01 +01001637 flush_warnings(warn);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001638out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 return ret;
1640}
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001641EXPORT_SYMBOL(__dquot_alloc_space);
Mingming Caof18df222009-01-13 16:43:09 +01001642
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643/*
1644 * This operation can block, but only after everything is updated
1645 */
Christoph Hellwig63936dd2010-03-03 09:05:01 -05001646int dquot_alloc_inode(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647{
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001648 int cnt, ret = 0, index;
Jan Karabf097aa2012-02-14 13:28:01 +01001649 struct dquot_warn warn[MAXQUOTAS];
1650 struct dquot * const *dquots = inode->i_dquot;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651
Christoph Hellwig189eef52010-06-04 10:56:29 +02001652 if (!dquot_active(inode))
Christoph Hellwig63936dd2010-03-03 09:05:01 -05001653 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
Jan Karabf097aa2012-02-14 13:28:01 +01001655 warn[cnt].w_type = QUOTA_NL_NOWARN;
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001656
1657 index = srcu_read_lock(&dquot_srcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 spin_lock(&dq_data_lock);
1659 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Jan Karabf097aa2012-02-14 13:28:01 +01001660 if (!dquots[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661 continue;
Jan Karabf097aa2012-02-14 13:28:01 +01001662 ret = check_idq(dquots[cnt], 1, &warn[cnt]);
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001663 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664 goto warn_put_all;
1665 }
1666
1667 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Jan Karabf097aa2012-02-14 13:28:01 +01001668 if (!dquots[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 continue;
Jan Karabf097aa2012-02-14 13:28:01 +01001670 dquot_incr_inodes(dquots[cnt], 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 }
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001672
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673warn_put_all:
1674 spin_unlock(&dq_data_lock);
Christoph Hellwig63936dd2010-03-03 09:05:01 -05001675 if (ret == 0)
Jan Karabf097aa2012-02-14 13:28:01 +01001676 mark_all_dquot_dirty(dquots);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001677 srcu_read_unlock(&dquot_srcu, index);
Jan Karabf097aa2012-02-14 13:28:01 +01001678 flush_warnings(warn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 return ret;
1680}
Mingming Cao08d03502009-01-14 16:19:32 +01001681EXPORT_SYMBOL(dquot_alloc_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001683/*
1684 * Convert in-memory reserved quotas to real consumed quotas
1685 */
1686int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
Mingming Cao740d9dc2009-01-13 16:43:14 +01001687{
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001688 int cnt, index;
Mingming Cao740d9dc2009-01-13 16:43:14 +01001689
Christoph Hellwig189eef52010-06-04 10:56:29 +02001690 if (!dquot_active(inode)) {
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001691 inode_claim_rsv_space(inode, number);
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001692 return 0;
Mingming Cao740d9dc2009-01-13 16:43:14 +01001693 }
1694
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001695 index = srcu_read_lock(&dquot_srcu);
Mingming Cao740d9dc2009-01-13 16:43:14 +01001696 spin_lock(&dq_data_lock);
1697 /* Claim reserved quotas to allocated quotas */
1698 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Jan Karadd6f3c62009-01-26 16:01:43 +01001699 if (inode->i_dquot[cnt])
Mingming Cao740d9dc2009-01-13 16:43:14 +01001700 dquot_claim_reserved_space(inode->i_dquot[cnt],
1701 number);
1702 }
1703 /* Update inode bytes */
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001704 inode_claim_rsv_space(inode, number);
Mingming Cao740d9dc2009-01-13 16:43:14 +01001705 spin_unlock(&dq_data_lock);
Dmitry Monakhovdc52dd32009-12-14 15:21:15 +03001706 mark_all_dquot_dirty(inode->i_dquot);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001707 srcu_read_unlock(&dquot_srcu, index);
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001708 return 0;
Mingming Cao740d9dc2009-01-13 16:43:14 +01001709}
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001710EXPORT_SYMBOL(dquot_claim_space_nodirty);
Mingming Cao740d9dc2009-01-13 16:43:14 +01001711
1712/*
Jan Kara1c8924e2013-08-17 09:32:32 -04001713 * Convert allocated space back to in-memory reserved quotas
1714 */
1715void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number)
1716{
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001717 int cnt, index;
Jan Kara1c8924e2013-08-17 09:32:32 -04001718
1719 if (!dquot_active(inode)) {
1720 inode_reclaim_rsv_space(inode, number);
1721 return;
1722 }
1723
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001724 index = srcu_read_lock(&dquot_srcu);
Jan Kara1c8924e2013-08-17 09:32:32 -04001725 spin_lock(&dq_data_lock);
1726 /* Claim reserved quotas to allocated quotas */
1727 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1728 if (inode->i_dquot[cnt])
1729 dquot_reclaim_reserved_space(inode->i_dquot[cnt],
1730 number);
1731 }
1732 /* Update inode bytes */
1733 inode_reclaim_rsv_space(inode, number);
1734 spin_unlock(&dq_data_lock);
1735 mark_all_dquot_dirty(inode->i_dquot);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001736 srcu_read_unlock(&dquot_srcu, index);
Jan Kara1c8924e2013-08-17 09:32:32 -04001737 return;
1738}
1739EXPORT_SYMBOL(dquot_reclaim_space_nodirty);
1740
1741/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742 * This operation can block, but only after everything is updated
1743 */
Eric Sandeen56246f92010-05-16 09:00:00 -04001744void __dquot_free_space(struct inode *inode, qsize_t number, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745{
1746 unsigned int cnt;
Jan Karabf097aa2012-02-14 13:28:01 +01001747 struct dquot_warn warn[MAXQUOTAS];
1748 struct dquot **dquots = inode->i_dquot;
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001749 int reserve = flags & DQUOT_SPACE_RESERVE, index;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750
Christoph Hellwig189eef52010-06-04 10:56:29 +02001751 if (!dquot_active(inode)) {
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001752 inode_decr_space(inode, number, reserve);
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001753 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 }
Jan Kara657d3bf2008-07-25 01:46:52 -07001755
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001756 index = srcu_read_lock(&dquot_srcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757 spin_lock(&dq_data_lock);
1758 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Jan Karabf097aa2012-02-14 13:28:01 +01001759 int wtype;
1760
1761 warn[cnt].w_type = QUOTA_NL_NOWARN;
1762 if (!dquots[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763 continue;
Jan Karabf097aa2012-02-14 13:28:01 +01001764 wtype = info_bdq_free(dquots[cnt], number);
1765 if (wtype != QUOTA_NL_NOWARN)
1766 prepare_warning(&warn[cnt], dquots[cnt], wtype);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001767 if (reserve)
Jan Karabf097aa2012-02-14 13:28:01 +01001768 dquot_free_reserved_space(dquots[cnt], number);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001769 else
Jan Karabf097aa2012-02-14 13:28:01 +01001770 dquot_decr_space(dquots[cnt], number);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771 }
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001772 inode_decr_space(inode, number, reserve);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773 spin_unlock(&dq_data_lock);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001774
1775 if (reserve)
1776 goto out_unlock;
Jan Karabf097aa2012-02-14 13:28:01 +01001777 mark_all_dquot_dirty(dquots);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001778out_unlock:
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001779 srcu_read_unlock(&dquot_srcu, index);
Jan Karabf097aa2012-02-14 13:28:01 +01001780 flush_warnings(warn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781}
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001782EXPORT_SYMBOL(__dquot_free_space);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001783
1784/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785 * This operation can block, but only after everything is updated
1786 */
Christoph Hellwig63936dd2010-03-03 09:05:01 -05001787void dquot_free_inode(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788{
1789 unsigned int cnt;
Jan Karabf097aa2012-02-14 13:28:01 +01001790 struct dquot_warn warn[MAXQUOTAS];
1791 struct dquot * const *dquots = inode->i_dquot;
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001792 int index;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793
Christoph Hellwig189eef52010-06-04 10:56:29 +02001794 if (!dquot_active(inode))
Christoph Hellwig63936dd2010-03-03 09:05:01 -05001795 return;
Jan Kara657d3bf2008-07-25 01:46:52 -07001796
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001797 index = srcu_read_lock(&dquot_srcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798 spin_lock(&dq_data_lock);
1799 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Jan Karabf097aa2012-02-14 13:28:01 +01001800 int wtype;
1801
1802 warn[cnt].w_type = QUOTA_NL_NOWARN;
1803 if (!dquots[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 continue;
Jan Karabf097aa2012-02-14 13:28:01 +01001805 wtype = info_idq_free(dquots[cnt], 1);
1806 if (wtype != QUOTA_NL_NOWARN)
1807 prepare_warning(&warn[cnt], dquots[cnt], wtype);
1808 dquot_decr_inodes(dquots[cnt], 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809 }
1810 spin_unlock(&dq_data_lock);
Jan Karabf097aa2012-02-14 13:28:01 +01001811 mark_all_dquot_dirty(dquots);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001812 srcu_read_unlock(&dquot_srcu, index);
Jan Karabf097aa2012-02-14 13:28:01 +01001813 flush_warnings(warn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001814}
Mingming Cao08d03502009-01-14 16:19:32 +01001815EXPORT_SYMBOL(dquot_free_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816
1817/*
1818 * Transfer the number of inode and blocks from one diskquota to an other.
Jan Karabc8e5f02010-05-13 19:58:50 +02001819 * On success, dquot references in transfer_to are consumed and references
1820 * to original dquots that need to be released are placed there. On failure,
1821 * references are kept untouched.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822 *
1823 * This operation can block, but only after everything is updated
1824 * A transaction must be started when entering this function.
Jan Karabc8e5f02010-05-13 19:58:50 +02001825 *
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001826 * We are holding reference on transfer_from & transfer_to, no need to
1827 * protect them by srcu_read_lock().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828 */
Jan Karabc8e5f02010-05-13 19:58:50 +02001829int __dquot_transfer(struct inode *inode, struct dquot **transfer_to)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830{
Mingming Cao740d9dc2009-01-13 16:43:14 +01001831 qsize_t space, cur_space;
1832 qsize_t rsv_space = 0;
Jan Karabc8e5f02010-05-13 19:58:50 +02001833 struct dquot *transfer_from[MAXQUOTAS] = {};
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001834 int cnt, ret = 0;
Dmitry9e327842010-10-09 23:15:30 +04001835 char is_valid[MAXQUOTAS] = {};
Jan Karabf097aa2012-02-14 13:28:01 +01001836 struct dquot_warn warn_to[MAXQUOTAS];
1837 struct dquot_warn warn_from_inodes[MAXQUOTAS];
1838 struct dquot_warn warn_from_space[MAXQUOTAS];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840 if (IS_NOQUOTA(inode))
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001841 return 0;
Jan Karacc334122009-01-12 17:23:05 +01001842 /* Initialize the arrays */
Jan Karabf097aa2012-02-14 13:28:01 +01001843 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1844 warn_to[cnt].w_type = QUOTA_NL_NOWARN;
1845 warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN;
1846 warn_from_space[cnt].w_type = QUOTA_NL_NOWARN;
1847 }
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001848
1849 spin_lock(&dq_data_lock);
Jan Karacc334122009-01-12 17:23:05 +01001850 if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001851 spin_unlock(&dq_data_lock);
Jan Karabc8e5f02010-05-13 19:58:50 +02001852 return 0;
Jan Karacc334122009-01-12 17:23:05 +01001853 }
Mingming Cao740d9dc2009-01-13 16:43:14 +01001854 cur_space = inode_get_bytes(inode);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001855 rsv_space = inode_get_rsv_space(inode);
Mingming Cao740d9dc2009-01-13 16:43:14 +01001856 space = cur_space + rsv_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857 /* Build the transfer_from list and check the limits */
1858 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Dmitry9e327842010-10-09 23:15:30 +04001859 /*
1860 * Skip changes for same uid or gid or for turned off quota-type.
1861 */
Jan Karadd6f3c62009-01-26 16:01:43 +01001862 if (!transfer_to[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863 continue;
Dmitry9e327842010-10-09 23:15:30 +04001864 /* Avoid races with quotaoff() */
1865 if (!sb_has_quota_active(inode->i_sb, cnt))
1866 continue;
1867 is_valid[cnt] = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001868 transfer_from[cnt] = inode->i_dquot[cnt];
Jan Karabf097aa2012-02-14 13:28:01 +01001869 ret = check_idq(transfer_to[cnt], 1, &warn_to[cnt]);
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001870 if (ret)
1871 goto over_quota;
Jan Karabf097aa2012-02-14 13:28:01 +01001872 ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]);
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001873 if (ret)
Jan Karacc334122009-01-12 17:23:05 +01001874 goto over_quota;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875 }
1876
1877 /*
1878 * Finally perform the needed transfer from transfer_from to transfer_to
1879 */
1880 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Dmitry9e327842010-10-09 23:15:30 +04001881 if (!is_valid[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883 /* Due to IO error we might not have transfer_from[] structure */
1884 if (transfer_from[cnt]) {
Jan Karabf097aa2012-02-14 13:28:01 +01001885 int wtype;
1886 wtype = info_idq_free(transfer_from[cnt], 1);
1887 if (wtype != QUOTA_NL_NOWARN)
1888 prepare_warning(&warn_from_inodes[cnt],
1889 transfer_from[cnt], wtype);
1890 wtype = info_bdq_free(transfer_from[cnt], space);
1891 if (wtype != QUOTA_NL_NOWARN)
1892 prepare_warning(&warn_from_space[cnt],
1893 transfer_from[cnt], wtype);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894 dquot_decr_inodes(transfer_from[cnt], 1);
Mingming Cao740d9dc2009-01-13 16:43:14 +01001895 dquot_decr_space(transfer_from[cnt], cur_space);
1896 dquot_free_reserved_space(transfer_from[cnt],
1897 rsv_space);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001898 }
1899
1900 dquot_incr_inodes(transfer_to[cnt], 1);
Mingming Cao740d9dc2009-01-13 16:43:14 +01001901 dquot_incr_space(transfer_to[cnt], cur_space);
1902 dquot_resv_space(transfer_to[cnt], rsv_space);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001903
1904 inode->i_dquot[cnt] = transfer_to[cnt];
1905 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906 spin_unlock(&dq_data_lock);
Jan Karacc334122009-01-12 17:23:05 +01001907
Dmitry Monakhovdc52dd32009-12-14 15:21:15 +03001908 mark_all_dquot_dirty(transfer_from);
1909 mark_all_dquot_dirty(transfer_to);
Jan Karabf097aa2012-02-14 13:28:01 +01001910 flush_warnings(warn_to);
1911 flush_warnings(warn_from_inodes);
1912 flush_warnings(warn_from_space);
Jan Karabc8e5f02010-05-13 19:58:50 +02001913 /* Pass back references to put */
Dmitry Monakhovdc52dd32009-12-14 15:21:15 +03001914 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
Dmitry9e327842010-10-09 23:15:30 +04001915 if (is_valid[cnt])
1916 transfer_to[cnt] = transfer_from[cnt];
Jan Kara86f3cbe2010-10-11 15:22:21 +02001917 return 0;
Jan Karacc334122009-01-12 17:23:05 +01001918over_quota:
1919 spin_unlock(&dq_data_lock);
Jan Karabf097aa2012-02-14 13:28:01 +01001920 flush_warnings(warn_to);
Jan Kara86f3cbe2010-10-11 15:22:21 +02001921 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922}
Jan Karabc8e5f02010-05-13 19:58:50 +02001923EXPORT_SYMBOL(__dquot_transfer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924
Dmitry Monakhov8ddd69d2010-02-16 08:31:50 +03001925/* Wrapper for transferring ownership of an inode for uid/gid only
1926 * Called from FSXXX_setattr()
1927 */
Christoph Hellwigb43fa822010-03-03 09:05:03 -05001928int dquot_transfer(struct inode *inode, struct iattr *iattr)
Jan Karab85f4b82008-07-25 01:46:50 -07001929{
Jan Karabc8e5f02010-05-13 19:58:50 +02001930 struct dquot *transfer_to[MAXQUOTAS] = {};
1931 struct super_block *sb = inode->i_sb;
1932 int ret;
Dmitry Monakhov8ddd69d2010-02-16 08:31:50 +03001933
Christoph Hellwig189eef52010-06-04 10:56:29 +02001934 if (!dquot_active(inode))
Jan Karabc8e5f02010-05-13 19:58:50 +02001935 return 0;
Dmitry Monakhov12755622010-04-08 22:04:20 +04001936
Eric W. Biederman1a06d422012-09-16 05:45:30 -07001937 if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid))
Eric W. Biedermanaca645a2012-09-16 03:11:50 -07001938 transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(iattr->ia_uid));
Eric W. Biederman1a06d422012-09-16 05:45:30 -07001939 if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))
Eric W. Biedermanaca645a2012-09-16 03:11:50 -07001940 transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(iattr->ia_gid));
Jan Karabc8e5f02010-05-13 19:58:50 +02001941
1942 ret = __dquot_transfer(inode, transfer_to);
1943 dqput_all(transfer_to);
1944 return ret;
Jan Karab85f4b82008-07-25 01:46:50 -07001945}
Christoph Hellwigb43fa822010-03-03 09:05:03 -05001946EXPORT_SYMBOL(dquot_transfer);
Jan Karab85f4b82008-07-25 01:46:50 -07001947
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948/*
1949 * Write info of quota file to disk
1950 */
1951int dquot_commit_info(struct super_block *sb, int type)
1952{
1953 int ret;
1954 struct quota_info *dqopt = sb_dqopt(sb);
1955
Ingo Molnard3be9152006-03-23 03:00:29 -08001956 mutex_lock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001957 ret = dqopt->ops[type]->write_file_info(sb, type);
Ingo Molnard3be9152006-03-23 03:00:29 -08001958 mutex_unlock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959 return ret;
1960}
Mingming Cao08d03502009-01-14 16:19:32 +01001961EXPORT_SYMBOL(dquot_commit_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962
1963/*
1964 * Definitions of diskquota operations.
1965 */
Alexey Dobriyan61e225d2009-09-21 17:01:08 -07001966const struct dquot_operations dquot_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 .write_dquot = dquot_commit,
1968 .acquire_dquot = dquot_acquire,
1969 .release_dquot = dquot_release,
1970 .mark_dirty = dquot_mark_dquot_dirty,
Jan Kara74f783a2008-08-19 14:51:22 +02001971 .write_info = dquot_commit_info,
1972 .alloc_dquot = dquot_alloc,
1973 .destroy_dquot = dquot_destroy,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974};
Christoph Hellwig123e9ca2010-05-19 07:16:44 -04001975EXPORT_SYMBOL(dquot_operations);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977/*
Christoph Hellwig907f4552010-03-03 09:05:06 -05001978 * Generic helper for ->open on filesystems supporting disk quotas.
1979 */
1980int dquot_file_open(struct inode *inode, struct file *file)
1981{
1982 int error;
1983
1984 error = generic_file_open(inode, file);
1985 if (!error && (file->f_mode & FMODE_WRITE))
Christoph Hellwig871a2932010-03-03 09:05:07 -05001986 dquot_initialize(inode);
Christoph Hellwig907f4552010-03-03 09:05:06 -05001987 return error;
1988}
1989EXPORT_SYMBOL(dquot_file_open);
1990
1991/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001992 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
1993 */
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04001994int dquot_disable(struct super_block *sb, int type, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995{
Jan Kara0ff5af82008-04-28 02:14:33 -07001996 int cnt, ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997 struct quota_info *dqopt = sb_dqopt(sb);
1998 struct inode *toputinode[MAXQUOTAS];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001999
Jan Karaf55abc02008-08-20 17:50:32 +02002000 /* Cannot turn off usage accounting without turning off limits, or
2001 * suspend quotas and simultaneously turn quotas off. */
2002 if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED))
2003 || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED |
2004 DQUOT_USAGE_ENABLED)))
2005 return -EINVAL;
2006
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007 /* We need to serialize quota_off() for device */
Ingo Molnard3be9152006-03-23 03:00:29 -08002008 mutex_lock(&dqopt->dqonoff_mutex);
Jan Kara9377abd2008-05-12 14:02:08 -07002009
2010 /*
2011 * Skip everything if there's nothing to do. We have to do this because
2012 * sometimes we are called when fill_super() failed and calling
2013 * sync_fs() in such cases does no good.
2014 */
Jan Karaf55abc02008-08-20 17:50:32 +02002015 if (!sb_any_quota_loaded(sb)) {
Jan Kara9377abd2008-05-12 14:02:08 -07002016 mutex_unlock(&dqopt->dqonoff_mutex);
2017 return 0;
2018 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002019 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
2020 toputinode[cnt] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021 if (type != -1 && cnt != type)
2022 continue;
Jan Karaf55abc02008-08-20 17:50:32 +02002023 if (!sb_has_quota_loaded(sb, cnt))
Jan Kara0ff5af82008-04-28 02:14:33 -07002024 continue;
Jan Karaf55abc02008-08-20 17:50:32 +02002025
2026 if (flags & DQUOT_SUSPENDED) {
Jan Karacc334122009-01-12 17:23:05 +01002027 spin_lock(&dq_state_lock);
Jan Karaf55abc02008-08-20 17:50:32 +02002028 dqopt->flags |=
2029 dquot_state_flag(DQUOT_SUSPENDED, cnt);
Jan Karacc334122009-01-12 17:23:05 +01002030 spin_unlock(&dq_state_lock);
Jan Karaf55abc02008-08-20 17:50:32 +02002031 } else {
Jan Karacc334122009-01-12 17:23:05 +01002032 spin_lock(&dq_state_lock);
Jan Karaf55abc02008-08-20 17:50:32 +02002033 dqopt->flags &= ~dquot_state_flag(flags, cnt);
2034 /* Turning off suspended quotas? */
2035 if (!sb_has_quota_loaded(sb, cnt) &&
2036 sb_has_quota_suspended(sb, cnt)) {
2037 dqopt->flags &= ~dquot_state_flag(
2038 DQUOT_SUSPENDED, cnt);
Jan Karacc334122009-01-12 17:23:05 +01002039 spin_unlock(&dq_state_lock);
Jan Karaf55abc02008-08-20 17:50:32 +02002040 iput(dqopt->files[cnt]);
2041 dqopt->files[cnt] = NULL;
2042 continue;
2043 }
Jan Karacc334122009-01-12 17:23:05 +01002044 spin_unlock(&dq_state_lock);
Jan Kara0ff5af82008-04-28 02:14:33 -07002045 }
Jan Karaf55abc02008-08-20 17:50:32 +02002046
2047 /* We still have to keep quota loaded? */
2048 if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002049 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002050
2051 /* Note: these are blocking operations */
2052 drop_dquot_ref(sb, cnt);
2053 invalidate_dquots(sb, cnt);
2054 /*
Jan Kara268157b2009-01-27 15:47:22 +01002055 * Now all dquots should be invalidated, all writes done so we
2056 * should be only users of the info. No locks needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002057 */
2058 if (info_dirty(&dqopt->info[cnt]))
2059 sb->dq_op->write_info(sb, cnt);
2060 if (dqopt->ops[cnt]->free_file_info)
2061 dqopt->ops[cnt]->free_file_info(sb, cnt);
2062 put_quota_format(dqopt->info[cnt].dqi_format);
2063
2064 toputinode[cnt] = dqopt->files[cnt];
Jan Karaf55abc02008-08-20 17:50:32 +02002065 if (!sb_has_quota_loaded(sb, cnt))
Jan Kara0ff5af82008-04-28 02:14:33 -07002066 dqopt->files[cnt] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067 dqopt->info[cnt].dqi_flags = 0;
2068 dqopt->info[cnt].dqi_igrace = 0;
2069 dqopt->info[cnt].dqi_bgrace = 0;
2070 dqopt->ops[cnt] = NULL;
2071 }
Ingo Molnard3be9152006-03-23 03:00:29 -08002072 mutex_unlock(&dqopt->dqonoff_mutex);
Jan Karaca785ec2008-09-30 17:53:37 +02002073
2074 /* Skip syncing and setting flags if quota files are hidden */
2075 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
2076 goto put_inodes;
2077
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078 /* Sync the superblock so that buffers with quota data are written to
Al Viro7b7b1ac2005-11-07 17:13:39 -05002079 * disk (and so userspace sees correct data afterwards). */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002080 if (sb->s_op->sync_fs)
2081 sb->s_op->sync_fs(sb, 1);
2082 sync_blockdev(sb->s_bdev);
2083 /* Now the quota files are just ordinary files and we can set the
2084 * inode flags back. Moreover we discard the pagecache so that
2085 * userspace sees the writes we did bypassing the pagecache. We
2086 * must also discard the blockdev buffers so that we see the
2087 * changes done by userspace on the next quotaon() */
2088 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
2089 if (toputinode[cnt]) {
Ingo Molnard3be9152006-03-23 03:00:29 -08002090 mutex_lock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002091 /* If quota was reenabled in the meantime, we have
2092 * nothing to do */
Jan Karaf55abc02008-08-20 17:50:32 +02002093 if (!sb_has_quota_loaded(sb, cnt)) {
Jan Karaa80b12c2012-04-25 21:15:53 +02002094 mutex_lock(&toputinode[cnt]->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095 toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
2096 S_NOATIME | S_NOQUOTA);
Jan Kara268157b2009-01-27 15:47:22 +01002097 truncate_inode_pages(&toputinode[cnt]->i_data,
2098 0);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002099 mutex_unlock(&toputinode[cnt]->i_mutex);
Jan Kara43d29322010-07-21 14:22:21 +02002100 mark_inode_dirty_sync(toputinode[cnt]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101 }
Ingo Molnard3be9152006-03-23 03:00:29 -08002102 mutex_unlock(&dqopt->dqonoff_mutex);
Jan Karaca785ec2008-09-30 17:53:37 +02002103 }
2104 if (sb->s_bdev)
2105 invalidate_bdev(sb->s_bdev);
2106put_inodes:
2107 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
2108 if (toputinode[cnt]) {
Jan Kara0ff5af82008-04-28 02:14:33 -07002109 /* On remount RO, we keep the inode pointer so that we
Jan Karaf55abc02008-08-20 17:50:32 +02002110 * can reenable quota on the subsequent remount RW. We
2111 * have to check 'flags' variable and not use sb_has_
2112 * function because another quotaon / quotaoff could
2113 * change global state before we got here. We refuse
2114 * to suspend quotas when there is pending delete on
2115 * the quota file... */
2116 if (!(flags & DQUOT_SUSPENDED))
Jan Kara0ff5af82008-04-28 02:14:33 -07002117 iput(toputinode[cnt]);
2118 else if (!toputinode[cnt]->i_nlink)
2119 ret = -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002120 }
Jan Kara0ff5af82008-04-28 02:14:33 -07002121 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002122}
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002123EXPORT_SYMBOL(dquot_disable);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002124
Christoph Hellwig287a8092010-05-19 07:16:45 -04002125int dquot_quota_off(struct super_block *sb, int type)
Jan Karaf55abc02008-08-20 17:50:32 +02002126{
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002127 return dquot_disable(sb, type,
2128 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
Jan Karaf55abc02008-08-20 17:50:32 +02002129}
Christoph Hellwig287a8092010-05-19 07:16:45 -04002130EXPORT_SYMBOL(dquot_quota_off);
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002131
Linus Torvalds1da177e2005-04-16 15:20:36 -07002132/*
2133 * Turn quotas on on a device
2134 */
2135
Jan Karaf55abc02008-08-20 17:50:32 +02002136/*
2137 * Helper function to turn quotas on when we already have the inode of
2138 * quota file and no quota information is loaded.
2139 */
2140static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
2141 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002142{
2143 struct quota_format_type *fmt = find_quota_format(format_id);
2144 struct super_block *sb = inode->i_sb;
2145 struct quota_info *dqopt = sb_dqopt(sb);
2146 int error;
2147 int oldflags = -1;
2148
2149 if (!fmt)
2150 return -ESRCH;
2151 if (!S_ISREG(inode->i_mode)) {
2152 error = -EACCES;
2153 goto out_fmt;
2154 }
2155 if (IS_RDONLY(inode)) {
2156 error = -EROFS;
2157 goto out_fmt;
2158 }
2159 if (!sb->s_op->quota_write || !sb->s_op->quota_read) {
2160 error = -EINVAL;
2161 goto out_fmt;
2162 }
Jan Karaf55abc02008-08-20 17:50:32 +02002163 /* Usage always has to be set... */
2164 if (!(flags & DQUOT_USAGE_ENABLED)) {
2165 error = -EINVAL;
2166 goto out_fmt;
2167 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002168
Jan Karaca785ec2008-09-30 17:53:37 +02002169 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
Jan Karaab94c392010-02-22 21:07:17 +01002170 /* As we bypass the pagecache we must now flush all the
2171 * dirty data and invalidate caches so that kernel sees
2172 * changes from userspace. It is not enough to just flush
2173 * the quota file since if blocksize < pagesize, invalidation
2174 * of the cache could fail because of other unrelated dirty
2175 * data */
2176 sync_filesystem(sb);
Jan Karaca785ec2008-09-30 17:53:37 +02002177 invalidate_bdev(sb->s_bdev);
2178 }
Ingo Molnard3be9152006-03-23 03:00:29 -08002179 mutex_lock(&dqopt->dqonoff_mutex);
Jan Karaf55abc02008-08-20 17:50:32 +02002180 if (sb_has_quota_loaded(sb, type)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002181 error = -EBUSY;
2182 goto out_lock;
2183 }
Jan Karaca785ec2008-09-30 17:53:37 +02002184
2185 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2186 /* We don't want quota and atime on quota files (deadlocks
2187 * possible) Also nobody should write to the file - we use
2188 * special IO operations which ignore the immutable bit. */
Jan Karaa80b12c2012-04-25 21:15:53 +02002189 mutex_lock(&inode->i_mutex);
Jan Kara268157b2009-01-27 15:47:22 +01002190 oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE |
2191 S_NOQUOTA);
Jan Karaca785ec2008-09-30 17:53:37 +02002192 inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
Jan Karadee86562009-07-22 18:12:17 +02002193 mutex_unlock(&inode->i_mutex);
Jan Kara26245c92010-01-06 17:20:35 +01002194 /*
2195 * When S_NOQUOTA is set, remove dquot references as no more
2196 * references can be added
2197 */
Christoph Hellwig9f754752010-03-03 09:05:05 -05002198 __dquot_drop(inode);
Jan Karaca785ec2008-09-30 17:53:37 +02002199 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002200
2201 error = -EIO;
2202 dqopt->files[type] = igrab(inode);
2203 if (!dqopt->files[type])
2204 goto out_lock;
2205 error = -EINVAL;
2206 if (!fmt->qf_ops->check_quota_file(sb, type))
2207 goto out_file_init;
2208
2209 dqopt->ops[type] = fmt->qf_ops;
2210 dqopt->info[type].dqi_format = fmt;
Jan Kara0ff5af82008-04-28 02:14:33 -07002211 dqopt->info[type].dqi_fmt_id = format_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002212 INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
Ingo Molnard3be9152006-03-23 03:00:29 -08002213 mutex_lock(&dqopt->dqio_mutex);
Jan Kara268157b2009-01-27 15:47:22 +01002214 error = dqopt->ops[type]->read_file_info(sb, type);
2215 if (error < 0) {
Ingo Molnard3be9152006-03-23 03:00:29 -08002216 mutex_unlock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002217 goto out_file_init;
2218 }
Jan Kara46fe44c2011-11-16 15:03:59 +01002219 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
2220 dqopt->info[type].dqi_flags |= DQF_SYS_FILE;
Ingo Molnard3be9152006-03-23 03:00:29 -08002221 mutex_unlock(&dqopt->dqio_mutex);
Jan Karacc334122009-01-12 17:23:05 +01002222 spin_lock(&dq_state_lock);
Jan Karaf55abc02008-08-20 17:50:32 +02002223 dqopt->flags |= dquot_state_flag(flags, type);
Jan Karacc334122009-01-12 17:23:05 +01002224 spin_unlock(&dq_state_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002225
2226 add_dquot_ref(sb, type);
Ingo Molnard3be9152006-03-23 03:00:29 -08002227 mutex_unlock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002228
2229 return 0;
2230
2231out_file_init:
2232 dqopt->files[type] = NULL;
2233 iput(inode);
2234out_lock:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002235 if (oldflags != -1) {
Jan Karaa80b12c2012-04-25 21:15:53 +02002236 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002237 /* Set the flags back (in the case of accidental quotaon()
2238 * on a wrong file we don't want to mess up the flags) */
2239 inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
2240 inode->i_flags |= oldflags;
Jan Karadee86562009-07-22 18:12:17 +02002241 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242 }
Jiaying Zhangd01730d2009-07-07 18:15:21 +02002243 mutex_unlock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002244out_fmt:
2245 put_quota_format(fmt);
2246
2247 return error;
2248}
2249
Jan Kara0ff5af82008-04-28 02:14:33 -07002250/* Reenable quotas on remount RW */
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002251int dquot_resume(struct super_block *sb, int type)
Jan Kara0ff5af82008-04-28 02:14:33 -07002252{
2253 struct quota_info *dqopt = sb_dqopt(sb);
2254 struct inode *inode;
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002255 int ret = 0, cnt;
Jan Karaf55abc02008-08-20 17:50:32 +02002256 unsigned int flags;
Jan Kara0ff5af82008-04-28 02:14:33 -07002257
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002258 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
2259 if (type != -1 && cnt != type)
2260 continue;
Jan Kara0ff5af82008-04-28 02:14:33 -07002261
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002262 mutex_lock(&dqopt->dqonoff_mutex);
2263 if (!sb_has_quota_suspended(sb, cnt)) {
2264 mutex_unlock(&dqopt->dqonoff_mutex);
2265 continue;
2266 }
2267 inode = dqopt->files[cnt];
2268 dqopt->files[cnt] = NULL;
2269 spin_lock(&dq_state_lock);
2270 flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
2271 DQUOT_LIMITS_ENABLED,
2272 cnt);
2273 dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt);
2274 spin_unlock(&dq_state_lock);
2275 mutex_unlock(&dqopt->dqonoff_mutex);
2276
2277 flags = dquot_generic_flag(flags, cnt);
2278 ret = vfs_load_quota_inode(inode, cnt,
2279 dqopt->info[cnt].dqi_fmt_id, flags);
2280 iput(inode);
2281 }
Jan Kara0ff5af82008-04-28 02:14:33 -07002282
2283 return ret;
2284}
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002285EXPORT_SYMBOL(dquot_resume);
Jan Kara0ff5af82008-04-28 02:14:33 -07002286
Jan Karaf00c9e42010-09-15 17:38:58 +02002287int dquot_quota_on(struct super_block *sb, int type, int format_id,
2288 struct path *path)
Al Viro77e69da2008-08-01 04:29:18 -04002289{
2290 int error = security_quota_on(path->dentry);
2291 if (error)
2292 return error;
2293 /* Quota file not on the same filesystem? */
Al Virod8c95842011-12-07 18:16:57 -05002294 if (path->dentry->d_sb != sb)
Al Viro77e69da2008-08-01 04:29:18 -04002295 error = -EXDEV;
2296 else
Jan Karaf55abc02008-08-20 17:50:32 +02002297 error = vfs_load_quota_inode(path->dentry->d_inode, type,
2298 format_id, DQUOT_USAGE_ENABLED |
2299 DQUOT_LIMITS_ENABLED);
Al Viro77e69da2008-08-01 04:29:18 -04002300 return error;
2301}
Christoph Hellwig287a8092010-05-19 07:16:45 -04002302EXPORT_SYMBOL(dquot_quota_on);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002303
2304/*
Jan Karaf55abc02008-08-20 17:50:32 +02002305 * More powerful function for turning on quotas allowing setting
2306 * of individual quota flags
2307 */
Christoph Hellwig287a8092010-05-19 07:16:45 -04002308int dquot_enable(struct inode *inode, int type, int format_id,
2309 unsigned int flags)
Jan Karaf55abc02008-08-20 17:50:32 +02002310{
2311 int ret = 0;
2312 struct super_block *sb = inode->i_sb;
2313 struct quota_info *dqopt = sb_dqopt(sb);
2314
2315 /* Just unsuspend quotas? */
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002316 BUG_ON(flags & DQUOT_SUSPENDED);
2317
Jan Karaf55abc02008-08-20 17:50:32 +02002318 if (!flags)
2319 return 0;
2320 /* Just updating flags needed? */
2321 if (sb_has_quota_loaded(sb, type)) {
2322 mutex_lock(&dqopt->dqonoff_mutex);
2323 /* Now do a reliable test... */
2324 if (!sb_has_quota_loaded(sb, type)) {
2325 mutex_unlock(&dqopt->dqonoff_mutex);
2326 goto load_quota;
2327 }
2328 if (flags & DQUOT_USAGE_ENABLED &&
2329 sb_has_quota_usage_enabled(sb, type)) {
2330 ret = -EBUSY;
2331 goto out_lock;
2332 }
2333 if (flags & DQUOT_LIMITS_ENABLED &&
2334 sb_has_quota_limits_enabled(sb, type)) {
2335 ret = -EBUSY;
2336 goto out_lock;
2337 }
Jan Karacc334122009-01-12 17:23:05 +01002338 spin_lock(&dq_state_lock);
Jan Karaf55abc02008-08-20 17:50:32 +02002339 sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
Jan Karacc334122009-01-12 17:23:05 +01002340 spin_unlock(&dq_state_lock);
Jan Karaf55abc02008-08-20 17:50:32 +02002341out_lock:
2342 mutex_unlock(&dqopt->dqonoff_mutex);
2343 return ret;
2344 }
2345
2346load_quota:
2347 return vfs_load_quota_inode(inode, type, format_id, flags);
2348}
Christoph Hellwig287a8092010-05-19 07:16:45 -04002349EXPORT_SYMBOL(dquot_enable);
Jan Karaf55abc02008-08-20 17:50:32 +02002350
2351/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002352 * This function is used when filesystem needs to initialize quotas
2353 * during mount time.
2354 */
Christoph Hellwig287a8092010-05-19 07:16:45 -04002355int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
Christoph Hellwig84de8562005-06-23 00:09:16 -07002356 int format_id, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002357{
Christoph Hellwig84de8562005-06-23 00:09:16 -07002358 struct dentry *dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002359 int error;
2360
Jan Karac56818d2009-11-12 15:42:08 +01002361 mutex_lock(&sb->s_root->d_inode->i_mutex);
Christoph Hellwig2fa389c2005-06-23 00:09:16 -07002362 dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
Jan Karac56818d2009-11-12 15:42:08 +01002363 mutex_unlock(&sb->s_root->d_inode->i_mutex);
Christoph Hellwig84de8562005-06-23 00:09:16 -07002364 if (IS_ERR(dentry))
2365 return PTR_ERR(dentry);
2366
Jan Kara154f4842005-11-28 13:44:14 -08002367 if (!dentry->d_inode) {
2368 error = -ENOENT;
2369 goto out;
2370 }
2371
Linus Torvalds1da177e2005-04-16 15:20:36 -07002372 error = security_quota_on(dentry);
Christoph Hellwig84de8562005-06-23 00:09:16 -07002373 if (!error)
Jan Karaf55abc02008-08-20 17:50:32 +02002374 error = vfs_load_quota_inode(dentry->d_inode, type, format_id,
2375 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
Christoph Hellwig84de8562005-06-23 00:09:16 -07002376
Jan Kara154f4842005-11-28 13:44:14 -08002377out:
Christoph Hellwig84de8562005-06-23 00:09:16 -07002378 dput(dentry);
2379 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002380}
Christoph Hellwig287a8092010-05-19 07:16:45 -04002381EXPORT_SYMBOL(dquot_quota_on_mount);
Jan Karab85f4b82008-07-25 01:46:50 -07002382
Jan Kara12095462008-08-20 14:45:12 +02002383static inline qsize_t qbtos(qsize_t blocks)
2384{
2385 return blocks << QIF_DQBLKSIZE_BITS;
2386}
2387
2388static inline qsize_t stoqb(qsize_t space)
2389{
2390 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
2391}
2392
Linus Torvalds1da177e2005-04-16 15:20:36 -07002393/* Generic routine for getting common part of quota structure */
Christoph Hellwigb9b2dd32010-05-06 17:04:58 -04002394static void do_get_dqblk(struct dquot *dquot, struct fs_disk_quota *di)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002395{
2396 struct mem_dqblk *dm = &dquot->dq_dqb;
2397
Christoph Hellwigb9b2dd32010-05-06 17:04:58 -04002398 memset(di, 0, sizeof(*di));
2399 di->d_version = FS_DQUOT_VERSION;
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07002400 di->d_flags = dquot->dq_id.type == USRQUOTA ?
Christoph Hellwigade7ce32010-06-04 10:56:01 +02002401 FS_USER_QUOTA : FS_GROUP_QUOTA;
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07002402 di->d_id = from_kqid_munged(current_user_ns(), dquot->dq_id);
Christoph Hellwigb9b2dd32010-05-06 17:04:58 -04002403
Linus Torvalds1da177e2005-04-16 15:20:36 -07002404 spin_lock(&dq_data_lock);
Christoph Hellwigb9b2dd32010-05-06 17:04:58 -04002405 di->d_blk_hardlimit = stoqb(dm->dqb_bhardlimit);
2406 di->d_blk_softlimit = stoqb(dm->dqb_bsoftlimit);
2407 di->d_ino_hardlimit = dm->dqb_ihardlimit;
2408 di->d_ino_softlimit = dm->dqb_isoftlimit;
2409 di->d_bcount = dm->dqb_curspace + dm->dqb_rsvspace;
2410 di->d_icount = dm->dqb_curinodes;
2411 di->d_btimer = dm->dqb_btime;
2412 di->d_itimer = dm->dqb_itime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002413 spin_unlock(&dq_data_lock);
2414}
2415
Eric W. Biederman74a8a102012-09-16 02:07:49 -07002416int dquot_get_dqblk(struct super_block *sb, struct kqid qid,
Christoph Hellwig287a8092010-05-19 07:16:45 -04002417 struct fs_disk_quota *di)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002418{
2419 struct dquot *dquot;
2420
Eric W. Biedermanaca645a2012-09-16 03:11:50 -07002421 dquot = dqget(sb, qid);
Jan Karadd6f3c62009-01-26 16:01:43 +01002422 if (!dquot)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002423 return -ESRCH;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002424 do_get_dqblk(dquot, di);
2425 dqput(dquot);
Jan Karacc334122009-01-12 17:23:05 +01002426
Linus Torvalds1da177e2005-04-16 15:20:36 -07002427 return 0;
2428}
Christoph Hellwig287a8092010-05-19 07:16:45 -04002429EXPORT_SYMBOL(dquot_get_dqblk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002430
Christoph Hellwigc472b432010-05-06 17:05:17 -04002431#define VFS_FS_DQ_MASK \
2432 (FS_DQ_BCOUNT | FS_DQ_BSOFT | FS_DQ_BHARD | \
2433 FS_DQ_ICOUNT | FS_DQ_ISOFT | FS_DQ_IHARD | \
2434 FS_DQ_BTIMER | FS_DQ_ITIMER)
2435
Linus Torvalds1da177e2005-04-16 15:20:36 -07002436/* Generic routine for setting common part of quota structure */
Christoph Hellwigc472b432010-05-06 17:05:17 -04002437static int do_set_dqblk(struct dquot *dquot, struct fs_disk_quota *di)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002438{
2439 struct mem_dqblk *dm = &dquot->dq_dqb;
2440 int check_blim = 0, check_ilim = 0;
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07002441 struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type];
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07002442
Christoph Hellwigc472b432010-05-06 17:05:17 -04002443 if (di->d_fieldmask & ~VFS_FS_DQ_MASK)
2444 return -EINVAL;
2445
2446 if (((di->d_fieldmask & FS_DQ_BSOFT) &&
2447 (di->d_blk_softlimit > dqi->dqi_maxblimit)) ||
2448 ((di->d_fieldmask & FS_DQ_BHARD) &&
2449 (di->d_blk_hardlimit > dqi->dqi_maxblimit)) ||
2450 ((di->d_fieldmask & FS_DQ_ISOFT) &&
2451 (di->d_ino_softlimit > dqi->dqi_maxilimit)) ||
2452 ((di->d_fieldmask & FS_DQ_IHARD) &&
2453 (di->d_ino_hardlimit > dqi->dqi_maxilimit)))
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07002454 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002455
2456 spin_lock(&dq_data_lock);
Christoph Hellwigc472b432010-05-06 17:05:17 -04002457 if (di->d_fieldmask & FS_DQ_BCOUNT) {
2458 dm->dqb_curspace = di->d_bcount - dm->dqb_rsvspace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002459 check_blim = 1;
Andrew Perepechko08261672010-04-12 22:16:50 +04002460 set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002461 }
Christoph Hellwigc472b432010-05-06 17:05:17 -04002462
2463 if (di->d_fieldmask & FS_DQ_BSOFT)
2464 dm->dqb_bsoftlimit = qbtos(di->d_blk_softlimit);
2465 if (di->d_fieldmask & FS_DQ_BHARD)
2466 dm->dqb_bhardlimit = qbtos(di->d_blk_hardlimit);
2467 if (di->d_fieldmask & (FS_DQ_BSOFT | FS_DQ_BHARD)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002468 check_blim = 1;
Andrew Perepechko08261672010-04-12 22:16:50 +04002469 set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002470 }
Christoph Hellwigc472b432010-05-06 17:05:17 -04002471
2472 if (di->d_fieldmask & FS_DQ_ICOUNT) {
2473 dm->dqb_curinodes = di->d_icount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002474 check_ilim = 1;
Andrew Perepechko08261672010-04-12 22:16:50 +04002475 set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002476 }
Christoph Hellwigc472b432010-05-06 17:05:17 -04002477
2478 if (di->d_fieldmask & FS_DQ_ISOFT)
2479 dm->dqb_isoftlimit = di->d_ino_softlimit;
2480 if (di->d_fieldmask & FS_DQ_IHARD)
2481 dm->dqb_ihardlimit = di->d_ino_hardlimit;
2482 if (di->d_fieldmask & (FS_DQ_ISOFT | FS_DQ_IHARD)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002483 check_ilim = 1;
Andrew Perepechko08261672010-04-12 22:16:50 +04002484 set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002485 }
Christoph Hellwigc472b432010-05-06 17:05:17 -04002486
2487 if (di->d_fieldmask & FS_DQ_BTIMER) {
2488 dm->dqb_btime = di->d_btimer;
Jan Karae04a88a92009-01-07 18:07:29 -08002489 check_blim = 1;
Andrew Perepechko08261672010-04-12 22:16:50 +04002490 set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
Jan Kara4d59bce2008-10-02 16:48:10 +02002491 }
Christoph Hellwigc472b432010-05-06 17:05:17 -04002492
2493 if (di->d_fieldmask & FS_DQ_ITIMER) {
2494 dm->dqb_itime = di->d_itimer;
Jan Karae04a88a92009-01-07 18:07:29 -08002495 check_ilim = 1;
Andrew Perepechko08261672010-04-12 22:16:50 +04002496 set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
Jan Kara4d59bce2008-10-02 16:48:10 +02002497 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002498
2499 if (check_blim) {
Jan Kara268157b2009-01-27 15:47:22 +01002500 if (!dm->dqb_bsoftlimit ||
2501 dm->dqb_curspace < dm->dqb_bsoftlimit) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002502 dm->dqb_btime = 0;
2503 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
Christoph Hellwigc472b432010-05-06 17:05:17 -04002504 } else if (!(di->d_fieldmask & FS_DQ_BTIMER))
Jan Kara268157b2009-01-27 15:47:22 +01002505 /* Set grace only if user hasn't provided his own... */
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07002506 dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002507 }
2508 if (check_ilim) {
Jan Kara268157b2009-01-27 15:47:22 +01002509 if (!dm->dqb_isoftlimit ||
2510 dm->dqb_curinodes < dm->dqb_isoftlimit) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002511 dm->dqb_itime = 0;
2512 clear_bit(DQ_INODES_B, &dquot->dq_flags);
Christoph Hellwigc472b432010-05-06 17:05:17 -04002513 } else if (!(di->d_fieldmask & FS_DQ_ITIMER))
Jan Kara268157b2009-01-27 15:47:22 +01002514 /* Set grace only if user hasn't provided his own... */
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07002515 dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002516 }
Jan Kara268157b2009-01-27 15:47:22 +01002517 if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit ||
2518 dm->dqb_isoftlimit)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002519 clear_bit(DQ_FAKE_B, &dquot->dq_flags);
2520 else
2521 set_bit(DQ_FAKE_B, &dquot->dq_flags);
2522 spin_unlock(&dq_data_lock);
2523 mark_dquot_dirty(dquot);
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07002524
2525 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002526}
2527
Eric W. Biederman74a8a102012-09-16 02:07:49 -07002528int dquot_set_dqblk(struct super_block *sb, struct kqid qid,
Christoph Hellwigc472b432010-05-06 17:05:17 -04002529 struct fs_disk_quota *di)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002530{
2531 struct dquot *dquot;
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07002532 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002533
Eric W. Biedermanaca645a2012-09-16 03:11:50 -07002534 dquot = dqget(sb, qid);
Jan Karaf55abc02008-08-20 17:50:32 +02002535 if (!dquot) {
2536 rc = -ESRCH;
2537 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002538 }
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07002539 rc = do_set_dqblk(dquot, di);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002540 dqput(dquot);
Jan Karaf55abc02008-08-20 17:50:32 +02002541out:
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07002542 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002543}
Christoph Hellwig287a8092010-05-19 07:16:45 -04002544EXPORT_SYMBOL(dquot_set_dqblk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002545
2546/* Generic routine for getting common part of quota file information */
Christoph Hellwig287a8092010-05-19 07:16:45 -04002547int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002548{
2549 struct mem_dqinfo *mi;
2550
Ingo Molnard3be9152006-03-23 03:00:29 -08002551 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
Jan Karaf55abc02008-08-20 17:50:32 +02002552 if (!sb_has_quota_active(sb, type)) {
Ingo Molnard3be9152006-03-23 03:00:29 -08002553 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002554 return -ESRCH;
2555 }
2556 mi = sb_dqopt(sb)->info + type;
2557 spin_lock(&dq_data_lock);
2558 ii->dqi_bgrace = mi->dqi_bgrace;
2559 ii->dqi_igrace = mi->dqi_igrace;
Jan Kara46fe44c2011-11-16 15:03:59 +01002560 ii->dqi_flags = mi->dqi_flags & DQF_GETINFO_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002561 ii->dqi_valid = IIF_ALL;
2562 spin_unlock(&dq_data_lock);
Ingo Molnard3be9152006-03-23 03:00:29 -08002563 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002564 return 0;
2565}
Christoph Hellwig287a8092010-05-19 07:16:45 -04002566EXPORT_SYMBOL(dquot_get_dqinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002567
2568/* Generic routine for setting common part of quota file information */
Christoph Hellwig287a8092010-05-19 07:16:45 -04002569int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002570{
2571 struct mem_dqinfo *mi;
Jan Karaf55abc02008-08-20 17:50:32 +02002572 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002573
Ingo Molnard3be9152006-03-23 03:00:29 -08002574 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
Jan Karaf55abc02008-08-20 17:50:32 +02002575 if (!sb_has_quota_active(sb, type)) {
2576 err = -ESRCH;
2577 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002578 }
2579 mi = sb_dqopt(sb)->info + type;
2580 spin_lock(&dq_data_lock);
2581 if (ii->dqi_valid & IIF_BGRACE)
2582 mi->dqi_bgrace = ii->dqi_bgrace;
2583 if (ii->dqi_valid & IIF_IGRACE)
2584 mi->dqi_igrace = ii->dqi_igrace;
2585 if (ii->dqi_valid & IIF_FLAGS)
Jan Kara46fe44c2011-11-16 15:03:59 +01002586 mi->dqi_flags = (mi->dqi_flags & ~DQF_SETINFO_MASK) |
2587 (ii->dqi_flags & DQF_SETINFO_MASK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002588 spin_unlock(&dq_data_lock);
2589 mark_info_dirty(sb, type);
2590 /* Force write to disk */
2591 sb->dq_op->write_info(sb, type);
Jan Karaf55abc02008-08-20 17:50:32 +02002592out:
Ingo Molnard3be9152006-03-23 03:00:29 -08002593 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Jan Karaf55abc02008-08-20 17:50:32 +02002594 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002595}
Christoph Hellwig287a8092010-05-19 07:16:45 -04002596EXPORT_SYMBOL(dquot_set_dqinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002597
Christoph Hellwig287a8092010-05-19 07:16:45 -04002598const struct quotactl_ops dquot_quotactl_ops = {
2599 .quota_on = dquot_quota_on,
2600 .quota_off = dquot_quota_off,
2601 .quota_sync = dquot_quota_sync,
2602 .get_info = dquot_get_dqinfo,
2603 .set_info = dquot_set_dqinfo,
2604 .get_dqblk = dquot_get_dqblk,
2605 .set_dqblk = dquot_set_dqblk
Linus Torvalds1da177e2005-04-16 15:20:36 -07002606};
Christoph Hellwig287a8092010-05-19 07:16:45 -04002607EXPORT_SYMBOL(dquot_quotactl_ops);
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002608
2609static int do_proc_dqstats(struct ctl_table *table, int write,
2610 void __user *buffer, size_t *lenp, loff_t *ppos)
2611{
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002612 unsigned int type = (int *)table->data - dqstats.stat;
Dmitry Monakhovf32764b2010-05-26 23:21:58 +02002613
2614 /* Update global table */
2615 dqstats.stat[type] =
2616 percpu_counter_sum_positive(&dqstats.counter[type]);
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002617 return proc_dointvec(table, write, buffer, lenp, ppos);
2618}
2619
Joe Perchese6287532013-06-13 19:37:49 -07002620static struct ctl_table fs_dqstats_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002621 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002622 .procname = "lookups",
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002623 .data = &dqstats.stat[DQST_LOOKUPS],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002624 .maxlen = sizeof(int),
2625 .mode = 0444,
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002626 .proc_handler = do_proc_dqstats,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002627 },
2628 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002629 .procname = "drops",
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002630 .data = &dqstats.stat[DQST_DROPS],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002631 .maxlen = sizeof(int),
2632 .mode = 0444,
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002633 .proc_handler = do_proc_dqstats,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002634 },
2635 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002636 .procname = "reads",
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002637 .data = &dqstats.stat[DQST_READS],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002638 .maxlen = sizeof(int),
2639 .mode = 0444,
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002640 .proc_handler = do_proc_dqstats,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002641 },
2642 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002643 .procname = "writes",
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002644 .data = &dqstats.stat[DQST_WRITES],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002645 .maxlen = sizeof(int),
2646 .mode = 0444,
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002647 .proc_handler = do_proc_dqstats,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002648 },
2649 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002650 .procname = "cache_hits",
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002651 .data = &dqstats.stat[DQST_CACHE_HITS],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002652 .maxlen = sizeof(int),
2653 .mode = 0444,
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002654 .proc_handler = do_proc_dqstats,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002655 },
2656 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002657 .procname = "allocated_dquots",
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002658 .data = &dqstats.stat[DQST_ALLOC_DQUOTS],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002659 .maxlen = sizeof(int),
2660 .mode = 0444,
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002661 .proc_handler = do_proc_dqstats,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002662 },
2663 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002664 .procname = "free_dquots",
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002665 .data = &dqstats.stat[DQST_FREE_DQUOTS],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002666 .maxlen = sizeof(int),
2667 .mode = 0444,
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002668 .proc_handler = do_proc_dqstats,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002669 },
2670 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002671 .procname = "syncs",
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002672 .data = &dqstats.stat[DQST_SYNCS],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002673 .maxlen = sizeof(int),
2674 .mode = 0444,
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002675 .proc_handler = do_proc_dqstats,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002676 },
Jan Kara8e893462007-10-16 23:29:31 -07002677#ifdef CONFIG_PRINT_QUOTA_WARNING
Linus Torvalds1da177e2005-04-16 15:20:36 -07002678 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002679 .procname = "warnings",
2680 .data = &flag_print_warnings,
2681 .maxlen = sizeof(int),
2682 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08002683 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002684 },
Jan Kara8e893462007-10-16 23:29:31 -07002685#endif
Eric W. Biedermanab092032009-11-05 14:25:10 -08002686 { },
Linus Torvalds1da177e2005-04-16 15:20:36 -07002687};
2688
Joe Perchese6287532013-06-13 19:37:49 -07002689static struct ctl_table fs_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002690 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002691 .procname = "quota",
2692 .mode = 0555,
2693 .child = fs_dqstats_table,
2694 },
Eric W. Biedermanab092032009-11-05 14:25:10 -08002695 { },
Linus Torvalds1da177e2005-04-16 15:20:36 -07002696};
2697
Joe Perchese6287532013-06-13 19:37:49 -07002698static struct ctl_table sys_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002699 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002700 .procname = "fs",
2701 .mode = 0555,
2702 .child = fs_table,
2703 },
Eric W. Biedermanab092032009-11-05 14:25:10 -08002704 { },
Linus Torvalds1da177e2005-04-16 15:20:36 -07002705};
2706
2707static int __init dquot_init(void)
2708{
Dmitry Monakhovf32764b2010-05-26 23:21:58 +02002709 int i, ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002710 unsigned long nr_hash, order;
2711
2712 printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
2713
Eric W. Biederman0b4d4142007-02-14 00:34:09 -08002714 register_sysctl_table(sys_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002715
Paul Mundt20c2df82007-07-20 10:11:58 +09002716 dquot_cachep = kmem_cache_create("dquot",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002717 sizeof(struct dquot), sizeof(unsigned long) * 4,
Paul Jacksonfffb60f2006-03-24 03:16:06 -08002718 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
2719 SLAB_MEM_SPREAD|SLAB_PANIC),
Paul Mundt20c2df82007-07-20 10:11:58 +09002720 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002721
2722 order = 0;
2723 dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
2724 if (!dquot_hash)
2725 panic("Cannot create dquot hash table");
2726
Dmitry Monakhovf32764b2010-05-26 23:21:58 +02002727 for (i = 0; i < _DQST_DQSTAT_LAST; i++) {
2728 ret = percpu_counter_init(&dqstats.counter[i], 0);
2729 if (ret)
2730 panic("Cannot create dquot stat counters");
2731 }
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002732
Linus Torvalds1da177e2005-04-16 15:20:36 -07002733 /* Find power-of-two hlist_heads which can fit into allocation */
2734 nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
2735 dq_hash_bits = 0;
2736 do {
2737 dq_hash_bits++;
2738 } while (nr_hash >> dq_hash_bits);
2739 dq_hash_bits--;
2740
2741 nr_hash = 1UL << dq_hash_bits;
2742 dq_hash_mask = nr_hash - 1;
2743 for (i = 0; i < nr_hash; i++)
2744 INIT_HLIST_HEAD(dquot_hash + i);
2745
2746 printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
2747 nr_hash, order, (PAGE_SIZE << order));
2748
Rusty Russell8e1f9362007-07-17 04:03:17 -07002749 register_shrinker(&dqcache_shrinker);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002750
Linus Torvalds1da177e2005-04-16 15:20:36 -07002751 return 0;
2752}
2753module_init(dquot_init);