blob: 20d1f74561cf1354b6c5c2d5dabcb8052cf14a73 [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)
Jan Kara474d2602014-10-22 09:06:49 +0200637 ret = err;
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
Jan Kara2d0fa462014-09-25 16:36:14 +0200896static inline struct dquot **i_dquot(struct inode *inode)
897{
Jan Kara2d0fa462014-09-25 16:36:14 +0200898 return inode->i_sb->s_op->get_dquots(inode);
899}
900
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901static int dqinit_needed(struct inode *inode, int type)
902{
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +0300903 struct dquot * const *dquots;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 int cnt;
905
906 if (IS_NOQUOTA(inode))
907 return 0;
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +0300908
909 dquots = i_dquot(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 if (type != -1)
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +0300911 return !dquots[type];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +0300913 if (!dquots[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 return 1;
915 return 0;
916}
917
Ingo Molnard3be9152006-03-23 03:00:29 -0800918/* This routine is guarded by dqonoff_mutex mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919static void add_dquot_ref(struct super_block *sb, int type)
920{
Jan Kara941d2382008-02-06 01:37:36 -0800921 struct inode *inode, *old_inode = NULL;
Jan Kara62af9b52010-04-19 16:47:20 +0200922#ifdef CONFIG_QUOTA_DEBUG
Jan Kara0a5a9c72010-02-09 18:20:39 +0100923 int reserved = 0;
Jan Kara4c5e6c02010-04-06 18:52:47 +0200924#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925
Dave Chinner55fa6092011-03-22 22:23:40 +1100926 spin_lock(&inode_sb_list_lock);
Christoph Hellwigd003fb72007-02-12 00:51:58 -0800927 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
Dave Chinner250df6e2011-03-22 22:23:36 +1100928 spin_lock(&inode->i_lock);
929 if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
930 !atomic_read(&inode->i_writecount) ||
931 !dqinit_needed(inode, type)) {
932 spin_unlock(&inode->i_lock);
Nick Pigginaabb8fd2009-03-11 13:17:36 -0700933 continue;
Dave Chinner250df6e2011-03-22 22:23:36 +1100934 }
Christoph Hellwigd003fb72007-02-12 00:51:58 -0800935 __iget(inode);
Dave Chinner250df6e2011-03-22 22:23:36 +1100936 spin_unlock(&inode->i_lock);
Dave Chinner55fa6092011-03-22 22:23:40 +1100937 spin_unlock(&inode_sb_list_lock);
Christoph Hellwigd003fb72007-02-12 00:51:58 -0800938
Jan Karad7e97112012-04-24 17:08:41 +0200939#ifdef CONFIG_QUOTA_DEBUG
940 if (unlikely(inode_get_rsv_space(inode) > 0))
941 reserved = 1;
942#endif
Jan Kara941d2382008-02-06 01:37:36 -0800943 iput(old_inode);
Christoph Hellwig871a2932010-03-03 09:05:07 -0500944 __dquot_initialize(inode, type);
Dave Chinner55fa6092011-03-22 22:23:40 +1100945
946 /*
947 * We hold a reference to 'inode' so it couldn't have been
948 * removed from s_inodes list while we dropped the
949 * inode_sb_list_lock We cannot iput the inode now as we can be
950 * holding the last reference and we cannot iput it under
951 * inode_sb_list_lock. So we keep the reference and iput it
952 * later.
953 */
Jan Kara941d2382008-02-06 01:37:36 -0800954 old_inode = inode;
Dave Chinner55fa6092011-03-22 22:23:40 +1100955 spin_lock(&inode_sb_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 }
Dave Chinner55fa6092011-03-22 22:23:40 +1100957 spin_unlock(&inode_sb_list_lock);
Jan Kara941d2382008-02-06 01:37:36 -0800958 iput(old_inode);
Jan Kara0a5a9c72010-02-09 18:20:39 +0100959
Jan Kara62af9b52010-04-19 16:47:20 +0200960#ifdef CONFIG_QUOTA_DEBUG
Jan Kara0a5a9c72010-02-09 18:20:39 +0100961 if (reserved) {
Jiaying Zhangfb5ffb02010-07-20 16:54:43 +0200962 quota_error(sb, "Writes happened before quota was turned on "
963 "thus quota information is probably inconsistent. "
964 "Please run quotacheck(8)");
Jan Kara0a5a9c72010-02-09 18:20:39 +0100965 }
Jan Kara4c5e6c02010-04-06 18:52:47 +0200966#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967}
968
Jan Kara268157b2009-01-27 15:47:22 +0100969/*
Jan Kara268157b2009-01-27 15:47:22 +0100970 * Remove references to dquots from inode and add dquot to list for freeing
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300971 * if we have the last reference to dquot
Jan Kara268157b2009-01-27 15:47:22 +0100972 */
Niu Yawei9eb64632014-06-04 12:21:30 +0800973static void remove_inode_dquot_ref(struct inode *inode, int type,
974 struct list_head *tofree_head)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975{
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +0300976 struct dquot **dquots = i_dquot(inode);
977 struct dquot *dquot = dquots[type];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978
Niu Yawei9eb64632014-06-04 12:21:30 +0800979 if (!dquot)
980 return;
981
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +0300982 dquots[type] = NULL;
Niu Yawei9eb64632014-06-04 12:21:30 +0800983 if (list_empty(&dquot->dq_free)) {
984 /*
985 * The inode still has reference to dquot so it can't be in the
986 * free list
987 */
988 spin_lock(&dq_list_lock);
989 list_add(&dquot->dq_free, tofree_head);
990 spin_unlock(&dq_list_lock);
991 } else {
992 /*
993 * Dquot is already in a list to put so we won't drop the last
994 * reference here.
995 */
996 dqput(dquot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998}
999
Jan Kara268157b2009-01-27 15:47:22 +01001000/*
1001 * Free list of dquots
1002 * Dquots are removed from inodes and no new references can be got so we are
1003 * the only ones holding reference
1004 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005static void put_dquot_list(struct list_head *tofree_head)
1006{
1007 struct list_head *act_head;
1008 struct dquot *dquot;
1009
1010 act_head = tofree_head->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 while (act_head != tofree_head) {
1012 dquot = list_entry(act_head, struct dquot, dq_free);
1013 act_head = act_head->next;
Jan Kara268157b2009-01-27 15:47:22 +01001014 /* Remove dquot from the list so we won't have problems... */
1015 list_del_init(&dquot->dq_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 dqput(dquot);
1017 }
1018}
1019
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001020static void remove_dquot_ref(struct super_block *sb, int type,
1021 struct list_head *tofree_head)
1022{
1023 struct inode *inode;
Dmitry Monakhov7af9cce2010-06-01 11:39:48 +04001024 int reserved = 0;
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001025
Dave Chinner55fa6092011-03-22 22:23:40 +11001026 spin_lock(&inode_sb_list_lock);
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001027 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
Nick Pigginaabb8fd2009-03-11 13:17:36 -07001028 /*
1029 * We have to scan also I_NEW inodes because they can already
1030 * have quota pointer initialized. Luckily, we need to touch
1031 * only quota pointers and these have separate locking
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001032 * (dq_data_lock).
Nick Pigginaabb8fd2009-03-11 13:17:36 -07001033 */
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001034 spin_lock(&dq_data_lock);
Dmitry Monakhov7af9cce2010-06-01 11:39:48 +04001035 if (!IS_NOQUOTA(inode)) {
1036 if (unlikely(inode_get_rsv_space(inode) > 0))
1037 reserved = 1;
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001038 remove_inode_dquot_ref(inode, type, tofree_head);
Dmitry Monakhov7af9cce2010-06-01 11:39:48 +04001039 }
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001040 spin_unlock(&dq_data_lock);
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001041 }
Dave Chinner55fa6092011-03-22 22:23:40 +11001042 spin_unlock(&inode_sb_list_lock);
Dmitry Monakhov7af9cce2010-06-01 11:39:48 +04001043#ifdef CONFIG_QUOTA_DEBUG
1044 if (reserved) {
1045 printk(KERN_WARNING "VFS (%s): Writes happened after quota"
1046 " was disabled thus quota information is probably "
1047 "inconsistent. Please run quotacheck(8).\n", sb->s_id);
1048 }
1049#endif
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001050}
1051
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052/* Gather all references from inodes and drop them */
1053static void drop_dquot_ref(struct super_block *sb, int type)
1054{
1055 LIST_HEAD(tofree_head);
1056
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001057 if (sb->dq_op) {
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001058 remove_dquot_ref(sb, type, &tofree_head);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001059 synchronize_srcu(&dquot_srcu);
Christoph Hellwigfb58b732007-02-12 00:51:57 -08001060 put_dquot_list(&tofree_head);
1061 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062}
1063
Jan Kara12095462008-08-20 14:45:12 +02001064static inline void dquot_incr_inodes(struct dquot *dquot, qsize_t number)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065{
1066 dquot->dq_dqb.dqb_curinodes += number;
1067}
1068
1069static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
1070{
1071 dquot->dq_dqb.dqb_curspace += number;
1072}
1073
Mingming Caof18df222009-01-13 16:43:09 +01001074static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
1075{
1076 dquot->dq_dqb.dqb_rsvspace += number;
1077}
1078
Mingming Cao740d9dc2009-01-13 16:43:14 +01001079/*
1080 * Claim reserved quota space
1081 */
Jan Kara0a5a9c72010-02-09 18:20:39 +01001082static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number)
Mingming Cao740d9dc2009-01-13 16:43:14 +01001083{
Jan Kara0a5a9c72010-02-09 18:20:39 +01001084 if (dquot->dq_dqb.dqb_rsvspace < number) {
1085 WARN_ON_ONCE(1);
1086 number = dquot->dq_dqb.dqb_rsvspace;
1087 }
Mingming Cao740d9dc2009-01-13 16:43:14 +01001088 dquot->dq_dqb.dqb_curspace += number;
1089 dquot->dq_dqb.dqb_rsvspace -= number;
1090}
1091
Jan Kara1c8924e2013-08-17 09:32:32 -04001092static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number)
1093{
1094 if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number))
1095 number = dquot->dq_dqb.dqb_curspace;
1096 dquot->dq_dqb.dqb_rsvspace += number;
1097 dquot->dq_dqb.dqb_curspace -= number;
1098}
1099
Mingming Cao740d9dc2009-01-13 16:43:14 +01001100static inline
1101void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
1102{
Jan Kara0a5a9c72010-02-09 18:20:39 +01001103 if (dquot->dq_dqb.dqb_rsvspace >= number)
1104 dquot->dq_dqb.dqb_rsvspace -= number;
1105 else {
1106 WARN_ON_ONCE(1);
1107 dquot->dq_dqb.dqb_rsvspace = 0;
1108 }
Mingming Cao740d9dc2009-01-13 16:43:14 +01001109}
1110
Jan Kara7a2435d2009-01-27 01:47:11 +01001111static void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112{
Jan Karadb49d2d2008-10-01 18:21:39 +02001113 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
1114 dquot->dq_dqb.dqb_curinodes >= number)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 dquot->dq_dqb.dqb_curinodes -= number;
1116 else
1117 dquot->dq_dqb.dqb_curinodes = 0;
1118 if (dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit)
1119 dquot->dq_dqb.dqb_itime = (time_t) 0;
1120 clear_bit(DQ_INODES_B, &dquot->dq_flags);
1121}
1122
Jan Kara7a2435d2009-01-27 01:47:11 +01001123static void dquot_decr_space(struct dquot *dquot, qsize_t number)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124{
Jan Karadb49d2d2008-10-01 18:21:39 +02001125 if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
1126 dquot->dq_dqb.dqb_curspace >= number)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 dquot->dq_dqb.dqb_curspace -= number;
1128 else
1129 dquot->dq_dqb.dqb_curspace = 0;
Jan Kara12095462008-08-20 14:45:12 +02001130 if (dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 dquot->dq_dqb.dqb_btime = (time_t) 0;
1132 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
1133}
1134
Jan Karabf097aa2012-02-14 13:28:01 +01001135struct dquot_warn {
1136 struct super_block *w_sb;
Eric W. Biederman7b9c7322012-09-16 04:05:34 -07001137 struct kqid w_dq_id;
Jan Karabf097aa2012-02-14 13:28:01 +01001138 short w_type;
1139};
1140
Jan Karac5254602007-12-22 14:03:25 -08001141static int warning_issued(struct dquot *dquot, const int warntype)
1142{
1143 int flag = (warntype == QUOTA_NL_BHARDWARN ||
1144 warntype == QUOTA_NL_BSOFTLONGWARN) ? DQ_BLKS_B :
1145 ((warntype == QUOTA_NL_IHARDWARN ||
1146 warntype == QUOTA_NL_ISOFTLONGWARN) ? DQ_INODES_B : 0);
1147
1148 if (!flag)
1149 return 0;
1150 return test_and_set_bit(flag, &dquot->dq_flags);
1151}
1152
Jan Kara8e893462007-10-16 23:29:31 -07001153#ifdef CONFIG_PRINT_QUOTA_WARNING
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154static int flag_print_warnings = 1;
1155
Jan Karabf097aa2012-02-14 13:28:01 +01001156static int need_print_warning(struct dquot_warn *warn)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157{
1158 if (!flag_print_warnings)
1159 return 0;
1160
Eric W. Biederman7b9c7322012-09-16 04:05:34 -07001161 switch (warn->w_dq_id.type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 case USRQUOTA:
Eric W. Biederman1a06d422012-09-16 05:45:30 -07001163 return uid_eq(current_fsuid(), warn->w_dq_id.uid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 case GRPQUOTA:
Eric W. Biederman7b9c7322012-09-16 04:05:34 -07001165 return in_group_p(warn->w_dq_id.gid);
Li Xi847aac62015-03-19 04:04:53 +09001166 case PRJQUOTA:
1167 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 }
1169 return 0;
1170}
1171
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172/* Print warning to user which exceeded quota */
Jan Karabf097aa2012-02-14 13:28:01 +01001173static void print_warning(struct dquot_warn *warn)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174{
1175 char *msg = NULL;
Peter Zijlstra24ec8392006-12-08 02:36:04 -08001176 struct tty_struct *tty;
Jan Karabf097aa2012-02-14 13:28:01 +01001177 int warntype = warn->w_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178
Jan Kara657d3bf2008-07-25 01:46:52 -07001179 if (warntype == QUOTA_NL_IHARDBELOW ||
1180 warntype == QUOTA_NL_ISOFTBELOW ||
1181 warntype == QUOTA_NL_BHARDBELOW ||
Jan Karabf097aa2012-02-14 13:28:01 +01001182 warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 return;
1184
Peter Zijlstra24ec8392006-12-08 02:36:04 -08001185 tty = get_current_tty();
1186 if (!tty)
Alan Cox452a00d2008-10-13 10:39:13 +01001187 return;
Jan Karabf097aa2012-02-14 13:28:01 +01001188 tty_write_message(tty, warn->w_sb->s_id);
Jan Kara8e893462007-10-16 23:29:31 -07001189 if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
Peter Zijlstra24ec8392006-12-08 02:36:04 -08001190 tty_write_message(tty, ": warning, ");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 else
Peter Zijlstra24ec8392006-12-08 02:36:04 -08001192 tty_write_message(tty, ": write failed, ");
Eric W. Biederman7b9c7322012-09-16 04:05:34 -07001193 tty_write_message(tty, quotatypes[warn->w_dq_id.type]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 switch (warntype) {
Jan Kara8e893462007-10-16 23:29:31 -07001195 case QUOTA_NL_IHARDWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 msg = " file limit reached.\r\n";
1197 break;
Jan Kara8e893462007-10-16 23:29:31 -07001198 case QUOTA_NL_ISOFTLONGWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 msg = " file quota exceeded too long.\r\n";
1200 break;
Jan Kara8e893462007-10-16 23:29:31 -07001201 case QUOTA_NL_ISOFTWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 msg = " file quota exceeded.\r\n";
1203 break;
Jan Kara8e893462007-10-16 23:29:31 -07001204 case QUOTA_NL_BHARDWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 msg = " block limit reached.\r\n";
1206 break;
Jan Kara8e893462007-10-16 23:29:31 -07001207 case QUOTA_NL_BSOFTLONGWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208 msg = " block quota exceeded too long.\r\n";
1209 break;
Jan Kara8e893462007-10-16 23:29:31 -07001210 case QUOTA_NL_BSOFTWARN:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 msg = " block quota exceeded.\r\n";
1212 break;
1213 }
Peter Zijlstra24ec8392006-12-08 02:36:04 -08001214 tty_write_message(tty, msg);
Alan Cox452a00d2008-10-13 10:39:13 +01001215 tty_kref_put(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216}
Jan Kara8e893462007-10-16 23:29:31 -07001217#endif
1218
Jan Karabf097aa2012-02-14 13:28:01 +01001219static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot,
1220 int warntype)
1221{
1222 if (warning_issued(dquot, warntype))
1223 return;
1224 warn->w_type = warntype;
1225 warn->w_sb = dquot->dq_sb;
1226 warn->w_dq_id = dquot->dq_id;
Jan Karabf097aa2012-02-14 13:28:01 +01001227}
1228
Mingming Caof18df222009-01-13 16:43:09 +01001229/*
1230 * Write warnings to the console and send warning messages over netlink.
1231 *
Jan Karabf097aa2012-02-14 13:28:01 +01001232 * Note that this function can call into tty and networking code.
Mingming Caof18df222009-01-13 16:43:09 +01001233 */
Jan Karabf097aa2012-02-14 13:28:01 +01001234static void flush_warnings(struct dquot_warn *warn)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235{
1236 int i;
1237
Steven Whitehouse86e931a2009-09-28 12:35:17 +01001238 for (i = 0; i < MAXQUOTAS; i++) {
Jan Karabf097aa2012-02-14 13:28:01 +01001239 if (warn[i].w_type == QUOTA_NL_NOWARN)
1240 continue;
Jan Kara8e893462007-10-16 23:29:31 -07001241#ifdef CONFIG_PRINT_QUOTA_WARNING
Jan Karabf097aa2012-02-14 13:28:01 +01001242 print_warning(&warn[i]);
Jan Kara8e893462007-10-16 23:29:31 -07001243#endif
Eric W. Biederman7b9c7322012-09-16 04:05:34 -07001244 quota_send_warning(warn[i].w_dq_id,
Jan Karabf097aa2012-02-14 13:28:01 +01001245 warn[i].w_sb->s_dev, warn[i].w_type);
Steven Whitehouse86e931a2009-09-28 12:35:17 +01001246 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247}
1248
Jan Kara7a2435d2009-01-27 01:47:11 +01001249static int ignore_hardlimit(struct dquot *dquot)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250{
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07001251 struct mem_dqinfo *info = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252
1253 return capable(CAP_SYS_RESOURCE) &&
Jan Kara268157b2009-01-27 15:47:22 +01001254 (info->dqi_format->qf_fmt_id != QFMT_VFS_OLD ||
Jan Kara9c451012014-11-19 09:21:58 +01001255 !(info->dqi_flags & DQF_ROOT_SQUASH));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256}
1257
1258/* needs dq_data_lock */
Jan Karabf097aa2012-02-14 13:28:01 +01001259static int check_idq(struct dquot *dquot, qsize_t inodes,
1260 struct dquot_warn *warn)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261{
Jan Kara268157b2009-01-27 15:47:22 +01001262 qsize_t newinodes = dquot->dq_dqb.dqb_curinodes + inodes;
1263
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07001264 if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type) ||
Jan Karaf55abc02008-08-20 17:50:32 +02001265 test_bit(DQ_FAKE_B, &dquot->dq_flags))
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001266 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267
1268 if (dquot->dq_dqb.dqb_ihardlimit &&
Jan Kara268157b2009-01-27 15:47:22 +01001269 newinodes > dquot->dq_dqb.dqb_ihardlimit &&
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_IHARDWARN);
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 &&
1277 dquot->dq_dqb.dqb_itime &&
1278 get_seconds() >= dquot->dq_dqb.dqb_itime &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 !ignore_hardlimit(dquot)) {
Jan Karabf097aa2012-02-14 13:28:01 +01001280 prepare_warning(warn, dquot, QUOTA_NL_ISOFTLONGWARN);
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001281 return -EDQUOT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282 }
1283
1284 if (dquot->dq_dqb.dqb_isoftlimit &&
Jan Kara268157b2009-01-27 15:47:22 +01001285 newinodes > dquot->dq_dqb.dqb_isoftlimit &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 dquot->dq_dqb.dqb_itime == 0) {
Jan Karabf097aa2012-02-14 13:28:01 +01001287 prepare_warning(warn, dquot, QUOTA_NL_ISOFTWARN);
Jan Kara268157b2009-01-27 15:47:22 +01001288 dquot->dq_dqb.dqb_itime = get_seconds() +
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07001289 sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type].dqi_igrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 }
1291
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001292 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293}
1294
1295/* needs dq_data_lock */
Jan Karabf097aa2012-02-14 13:28:01 +01001296static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc,
1297 struct dquot_warn *warn)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298{
Mingming Caof18df222009-01-13 16:43:09 +01001299 qsize_t tspace;
Jan Kara268157b2009-01-27 15:47:22 +01001300 struct super_block *sb = dquot->dq_sb;
Mingming Caof18df222009-01-13 16:43:09 +01001301
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07001302 if (!sb_has_quota_limits_enabled(sb, dquot->dq_id.type) ||
Jan Karaf55abc02008-08-20 17:50:32 +02001303 test_bit(DQ_FAKE_B, &dquot->dq_flags))
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001304 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305
Mingming Caof18df222009-01-13 16:43:09 +01001306 tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace
1307 + space;
1308
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 if (dquot->dq_dqb.dqb_bhardlimit &&
Mingming Caof18df222009-01-13 16:43:09 +01001310 tspace > dquot->dq_dqb.dqb_bhardlimit &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 !ignore_hardlimit(dquot)) {
1312 if (!prealloc)
Jan Karabf097aa2012-02-14 13:28:01 +01001313 prepare_warning(warn, dquot, QUOTA_NL_BHARDWARN);
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001314 return -EDQUOT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 }
1316
1317 if (dquot->dq_dqb.dqb_bsoftlimit &&
Mingming Caof18df222009-01-13 16:43:09 +01001318 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
Jan Kara268157b2009-01-27 15:47:22 +01001319 dquot->dq_dqb.dqb_btime &&
1320 get_seconds() >= dquot->dq_dqb.dqb_btime &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 !ignore_hardlimit(dquot)) {
1322 if (!prealloc)
Jan Karabf097aa2012-02-14 13:28:01 +01001323 prepare_warning(warn, dquot, QUOTA_NL_BSOFTLONGWARN);
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001324 return -EDQUOT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 }
1326
1327 if (dquot->dq_dqb.dqb_bsoftlimit &&
Mingming Caof18df222009-01-13 16:43:09 +01001328 tspace > dquot->dq_dqb.dqb_bsoftlimit &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 dquot->dq_dqb.dqb_btime == 0) {
1330 if (!prealloc) {
Jan Karabf097aa2012-02-14 13:28:01 +01001331 prepare_warning(warn, dquot, QUOTA_NL_BSOFTWARN);
Jan Kara268157b2009-01-27 15:47:22 +01001332 dquot->dq_dqb.dqb_btime = get_seconds() +
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07001333 sb_dqopt(sb)->info[dquot->dq_id.type].dqi_bgrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 }
1335 else
1336 /*
1337 * We don't allow preallocation to exceed softlimit so exceeding will
1338 * be always printed
1339 */
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001340 return -EDQUOT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 }
1342
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001343 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344}
1345
Jan Kara12095462008-08-20 14:45:12 +02001346static int info_idq_free(struct dquot *dquot, qsize_t inodes)
Jan Kara657d3bf2008-07-25 01:46:52 -07001347{
Jan Kara268157b2009-01-27 15:47:22 +01001348 qsize_t newinodes;
1349
Jan Kara657d3bf2008-07-25 01:46:52 -07001350 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
Jan Karaf55abc02008-08-20 17:50:32 +02001351 dquot->dq_dqb.dqb_curinodes <= dquot->dq_dqb.dqb_isoftlimit ||
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07001352 !sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_id.type))
Jan Kara657d3bf2008-07-25 01:46:52 -07001353 return QUOTA_NL_NOWARN;
1354
Jan Kara268157b2009-01-27 15:47:22 +01001355 newinodes = dquot->dq_dqb.dqb_curinodes - inodes;
1356 if (newinodes <= dquot->dq_dqb.dqb_isoftlimit)
Jan Kara657d3bf2008-07-25 01:46:52 -07001357 return QUOTA_NL_ISOFTBELOW;
1358 if (dquot->dq_dqb.dqb_curinodes >= dquot->dq_dqb.dqb_ihardlimit &&
Jan Kara268157b2009-01-27 15:47:22 +01001359 newinodes < dquot->dq_dqb.dqb_ihardlimit)
Jan Kara657d3bf2008-07-25 01:46:52 -07001360 return QUOTA_NL_IHARDBELOW;
1361 return QUOTA_NL_NOWARN;
1362}
1363
1364static int info_bdq_free(struct dquot *dquot, qsize_t space)
1365{
1366 if (test_bit(DQ_FAKE_B, &dquot->dq_flags) ||
Jan Kara12095462008-08-20 14:45:12 +02001367 dquot->dq_dqb.dqb_curspace <= dquot->dq_dqb.dqb_bsoftlimit)
Jan Kara657d3bf2008-07-25 01:46:52 -07001368 return QUOTA_NL_NOWARN;
1369
Jan Kara12095462008-08-20 14:45:12 +02001370 if (dquot->dq_dqb.dqb_curspace - space <= dquot->dq_dqb.dqb_bsoftlimit)
Jan Kara657d3bf2008-07-25 01:46:52 -07001371 return QUOTA_NL_BSOFTBELOW;
Jan Kara12095462008-08-20 14:45:12 +02001372 if (dquot->dq_dqb.dqb_curspace >= dquot->dq_dqb.dqb_bhardlimit &&
1373 dquot->dq_dqb.dqb_curspace - space < dquot->dq_dqb.dqb_bhardlimit)
Jan Kara657d3bf2008-07-25 01:46:52 -07001374 return QUOTA_NL_BHARDBELOW;
1375 return QUOTA_NL_NOWARN;
1376}
Jan Kara0a5a9c72010-02-09 18:20:39 +01001377
Christoph Hellwig189eef52010-06-04 10:56:29 +02001378static int dquot_active(const struct inode *inode)
1379{
1380 struct super_block *sb = inode->i_sb;
1381
1382 if (IS_NOQUOTA(inode))
1383 return 0;
1384 return sb_any_quota_loaded(sb) & ~sb_any_quota_suspended(sb);
1385}
1386
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387/*
Christoph Hellwig871a2932010-03-03 09:05:07 -05001388 * Initialize quota pointers in inode
1389 *
Christoph Hellwig871a2932010-03-03 09:05:07 -05001390 * It is better to call this function outside of any transaction as it
1391 * might need a lot of space in journal for dquot structure allocation.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392 */
Christoph Hellwig871a2932010-03-03 09:05:07 -05001393static void __dquot_initialize(struct inode *inode, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394{
Niu Yawei1ea06be2014-06-04 12:20:30 +08001395 int cnt, init_needed = 0;
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001396 struct dquot **dquots, *got[MAXQUOTAS];
Jan Karacc334122009-01-12 17:23:05 +01001397 struct super_block *sb = inode->i_sb;
Jan Kara0a5a9c72010-02-09 18:20:39 +01001398 qsize_t rsv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399
Christoph Hellwig189eef52010-06-04 10:56:29 +02001400 if (!dquot_active(inode))
Christoph Hellwig871a2932010-03-03 09:05:07 -05001401 return;
Jan Karacc334122009-01-12 17:23:05 +01001402
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001403 dquots = i_dquot(inode);
1404
Jan Karacc334122009-01-12 17:23:05 +01001405 /* First get references to structures we might need. */
1406 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Eric W. Biedermanaca645a2012-09-16 03:11:50 -07001407 struct kqid qid;
Li Xi847aac62015-03-19 04:04:53 +09001408 kprojid_t projid;
1409 int rc;
1410
Dmitry Monakhovad1e6e82010-02-16 08:31:49 +03001411 got[cnt] = NULL;
Jan Karacc334122009-01-12 17:23:05 +01001412 if (type != -1 && cnt != type)
1413 continue;
Niu Yawei1ea06be2014-06-04 12:20:30 +08001414 /*
1415 * The i_dquot should have been initialized in most cases,
1416 * we check it without locking here to avoid unnecessary
1417 * dqget()/dqput() calls.
1418 */
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001419 if (dquots[cnt])
Niu Yawei1ea06be2014-06-04 12:20:30 +08001420 continue;
Li Xi847aac62015-03-19 04:04:53 +09001421
1422 if (!sb_has_quota_active(sb, cnt))
1423 continue;
1424
Niu Yawei1ea06be2014-06-04 12:20:30 +08001425 init_needed = 1;
1426
Jan Karacc334122009-01-12 17:23:05 +01001427 switch (cnt) {
1428 case USRQUOTA:
Eric W. Biedermanaca645a2012-09-16 03:11:50 -07001429 qid = make_kqid_uid(inode->i_uid);
Jan Karacc334122009-01-12 17:23:05 +01001430 break;
1431 case GRPQUOTA:
Eric W. Biedermanaca645a2012-09-16 03:11:50 -07001432 qid = make_kqid_gid(inode->i_gid);
Jan Karacc334122009-01-12 17:23:05 +01001433 break;
Li Xi847aac62015-03-19 04:04:53 +09001434 case PRJQUOTA:
1435 rc = inode->i_sb->dq_op->get_projid(inode, &projid);
1436 if (rc)
1437 continue;
1438 qid = make_kqid_projid(projid);
1439 break;
Jan Karacc334122009-01-12 17:23:05 +01001440 }
Eric W. Biedermanaca645a2012-09-16 03:11:50 -07001441 got[cnt] = dqget(sb, qid);
Jan Karacc334122009-01-12 17:23:05 +01001442 }
1443
Niu Yawei1ea06be2014-06-04 12:20:30 +08001444 /* All required i_dquot has been initialized */
1445 if (!init_needed)
1446 return;
1447
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001448 spin_lock(&dq_data_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449 if (IS_NOQUOTA(inode))
1450 goto out_err;
1451 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1452 if (type != -1 && cnt != type)
1453 continue;
Jan Karacc334122009-01-12 17:23:05 +01001454 /* Avoid races with quotaoff() */
1455 if (!sb_has_quota_active(sb, cnt))
1456 continue;
Jan Kara4408ea42010-10-19 00:24:21 +02001457 /* We could race with quotaon or dqget() could have failed */
1458 if (!got[cnt])
1459 continue;
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001460 if (!dquots[cnt]) {
1461 dquots[cnt] = got[cnt];
Jan Karadd6f3c62009-01-26 16:01:43 +01001462 got[cnt] = NULL;
Jan Kara0a5a9c72010-02-09 18:20:39 +01001463 /*
1464 * Make quota reservation system happy if someone
1465 * did a write before quota was turned on
1466 */
1467 rsv = inode_get_rsv_space(inode);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001468 if (unlikely(rsv))
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001469 dquot_resv_space(dquots[cnt], rsv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470 }
1471 }
1472out_err:
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001473 spin_unlock(&dq_data_lock);
Jan Karacc334122009-01-12 17:23:05 +01001474 /* Drop unused references */
Dmitry Monakhovdc52dd32009-12-14 15:21:15 +03001475 dqput_all(got);
Christoph Hellwig871a2932010-03-03 09:05:07 -05001476}
1477
1478void dquot_initialize(struct inode *inode)
1479{
1480 __dquot_initialize(inode, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481}
Mingming Cao08d03502009-01-14 16:19:32 +01001482EXPORT_SYMBOL(dquot_initialize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483
1484/*
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001485 * Release all quotas referenced by inode.
1486 *
1487 * This function only be called on inode free or converting
1488 * a file to quota file, no other users for the i_dquot in
1489 * both cases, so we needn't call synchronize_srcu() after
1490 * clearing i_dquot.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 */
Christoph Hellwig9f754752010-03-03 09:05:05 -05001492static void __dquot_drop(struct inode *inode)
Jan Kara3d9ea252008-10-10 16:12:23 +02001493{
Jan Karacc334122009-01-12 17:23:05 +01001494 int cnt;
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001495 struct dquot **dquots = i_dquot(inode);
Jan Karacc334122009-01-12 17:23:05 +01001496 struct dquot *put[MAXQUOTAS];
1497
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001498 spin_lock(&dq_data_lock);
Jan Karacc334122009-01-12 17:23:05 +01001499 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001500 put[cnt] = dquots[cnt];
1501 dquots[cnt] = NULL;
Jan Karacc334122009-01-12 17:23:05 +01001502 }
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001503 spin_unlock(&dq_data_lock);
Dmitry Monakhovdc52dd32009-12-14 15:21:15 +03001504 dqput_all(put);
Christoph Hellwig9f754752010-03-03 09:05:05 -05001505}
1506
1507void dquot_drop(struct inode *inode)
1508{
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001509 struct dquot * const *dquots;
Christoph Hellwig9f754752010-03-03 09:05:05 -05001510 int cnt;
1511
1512 if (IS_NOQUOTA(inode))
1513 return;
1514
1515 /*
1516 * Test before calling to rule out calls from proc and such
1517 * where we are not allowed to block. Note that this is
1518 * actually reliable test even without the lock - the caller
1519 * must assure that nobody can come after the DQUOT_DROP and
1520 * add quota pointers back anyway.
1521 */
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001522 dquots = i_dquot(inode);
Christoph Hellwig9f754752010-03-03 09:05:05 -05001523 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001524 if (dquots[cnt])
Christoph Hellwig9f754752010-03-03 09:05:05 -05001525 break;
1526 }
1527
1528 if (cnt < MAXQUOTAS)
1529 __dquot_drop(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530}
Mingming Cao08d03502009-01-14 16:19:32 +01001531EXPORT_SYMBOL(dquot_drop);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532
1533/*
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001534 * inode_reserved_space is managed internally by quota, and protected by
1535 * i_lock similar to i_blocks+i_bytes.
1536 */
1537static qsize_t *inode_reserved_space(struct inode * inode)
1538{
1539 /* Filesystem must explicitly define it's own method in order to use
1540 * quota reservation interface */
1541 BUG_ON(!inode->i_sb->dq_op->get_reserved_space);
1542 return inode->i_sb->dq_op->get_reserved_space(inode);
1543}
1544
Dmitry Monakhovc4690702010-02-09 17:53:36 +01001545void inode_add_rsv_space(struct inode *inode, qsize_t number)
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001546{
1547 spin_lock(&inode->i_lock);
1548 *inode_reserved_space(inode) += number;
1549 spin_unlock(&inode->i_lock);
1550}
Dmitry Monakhovc4690702010-02-09 17:53:36 +01001551EXPORT_SYMBOL(inode_add_rsv_space);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001552
Dmitry Monakhovc4690702010-02-09 17:53:36 +01001553void inode_claim_rsv_space(struct inode *inode, qsize_t number)
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001554{
1555 spin_lock(&inode->i_lock);
1556 *inode_reserved_space(inode) -= number;
1557 __inode_add_bytes(inode, number);
1558 spin_unlock(&inode->i_lock);
1559}
Dmitry Monakhovc4690702010-02-09 17:53:36 +01001560EXPORT_SYMBOL(inode_claim_rsv_space);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001561
Jan Kara1c8924e2013-08-17 09:32:32 -04001562void inode_reclaim_rsv_space(struct inode *inode, qsize_t number)
1563{
1564 spin_lock(&inode->i_lock);
1565 *inode_reserved_space(inode) += number;
1566 __inode_sub_bytes(inode, number);
1567 spin_unlock(&inode->i_lock);
1568}
1569EXPORT_SYMBOL(inode_reclaim_rsv_space);
1570
Dmitry Monakhovc4690702010-02-09 17:53:36 +01001571void inode_sub_rsv_space(struct inode *inode, qsize_t number)
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001572{
1573 spin_lock(&inode->i_lock);
1574 *inode_reserved_space(inode) -= number;
1575 spin_unlock(&inode->i_lock);
1576}
Dmitry Monakhovc4690702010-02-09 17:53:36 +01001577EXPORT_SYMBOL(inode_sub_rsv_space);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001578
1579static qsize_t inode_get_rsv_space(struct inode *inode)
1580{
1581 qsize_t ret;
Jan Kara05b5d892010-01-06 18:03:36 +01001582
1583 if (!inode->i_sb->dq_op->get_reserved_space)
1584 return 0;
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001585 spin_lock(&inode->i_lock);
1586 ret = *inode_reserved_space(inode);
1587 spin_unlock(&inode->i_lock);
1588 return ret;
1589}
1590
1591static void inode_incr_space(struct inode *inode, qsize_t number,
1592 int reserve)
1593{
1594 if (reserve)
1595 inode_add_rsv_space(inode, number);
1596 else
1597 inode_add_bytes(inode, number);
1598}
1599
1600static void inode_decr_space(struct inode *inode, qsize_t number, int reserve)
1601{
1602 if (reserve)
1603 inode_sub_rsv_space(inode, number);
1604 else
1605 inode_sub_bytes(inode, number);
1606}
1607
1608/*
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001609 * This functions updates i_blocks+i_bytes fields and quota information
1610 * (together with appropriate checks).
1611 *
1612 * NOTE: We absolutely rely on the fact that caller dirties the inode
1613 * (usually helpers in quotaops.h care about this) and holds a handle for
1614 * the current transaction so that dquot write and inode write go into the
1615 * same transaction.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616 */
1617
1618/*
1619 * This operation can block, but only after everything is updated
1620 */
Eric Sandeen56246f92010-05-16 09:00:00 -04001621int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622{
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001623 int cnt, ret = 0, index;
Jan Karabf097aa2012-02-14 13:28:01 +01001624 struct dquot_warn warn[MAXQUOTAS];
Eric Sandeen56246f92010-05-16 09:00:00 -04001625 int reserve = flags & DQUOT_SPACE_RESERVE;
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001626 struct dquot **dquots;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627
Christoph Hellwig189eef52010-06-04 10:56:29 +02001628 if (!dquot_active(inode)) {
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001629 inode_incr_space(inode, number, reserve);
1630 goto out;
1631 }
1632
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
Jan Karabf097aa2012-02-14 13:28:01 +01001634 warn[cnt].w_type = QUOTA_NL_NOWARN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001636 dquots = i_dquot(inode);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001637 index = srcu_read_lock(&dquot_srcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638 spin_lock(&dq_data_lock);
1639 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Jan Karabf097aa2012-02-14 13:28:01 +01001640 if (!dquots[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641 continue;
Jan Karabf097aa2012-02-14 13:28:01 +01001642 ret = check_bdq(dquots[cnt], number,
1643 !(flags & DQUOT_SPACE_WARN), &warn[cnt]);
1644 if (ret && !(flags & DQUOT_SPACE_NOFAIL)) {
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001645 spin_unlock(&dq_data_lock);
1646 goto out_flush_warn;
Mingming Caof18df222009-01-13 16:43:09 +01001647 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 }
1649 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Jan Karabf097aa2012-02-14 13:28:01 +01001650 if (!dquots[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651 continue;
Mingming Caof18df222009-01-13 16:43:09 +01001652 if (reserve)
Jan Karabf097aa2012-02-14 13:28:01 +01001653 dquot_resv_space(dquots[cnt], number);
Mingming Caof18df222009-01-13 16:43:09 +01001654 else
Jan Karabf097aa2012-02-14 13:28:01 +01001655 dquot_incr_space(dquots[cnt], number);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 }
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001657 inode_incr_space(inode, number, reserve);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 spin_unlock(&dq_data_lock);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001659
1660 if (reserve)
1661 goto out_flush_warn;
Jan Karabf097aa2012-02-14 13:28:01 +01001662 mark_all_dquot_dirty(dquots);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001663out_flush_warn:
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001664 srcu_read_unlock(&dquot_srcu, index);
Jan Karabf097aa2012-02-14 13:28:01 +01001665 flush_warnings(warn);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001666out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667 return ret;
1668}
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001669EXPORT_SYMBOL(__dquot_alloc_space);
Mingming Caof18df222009-01-13 16:43:09 +01001670
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671/*
1672 * This operation can block, but only after everything is updated
1673 */
Jan Kara6bab3592014-10-20 16:01:33 +02001674int dquot_alloc_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675{
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001676 int cnt, ret = 0, index;
Jan Karabf097aa2012-02-14 13:28:01 +01001677 struct dquot_warn warn[MAXQUOTAS];
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001678 struct dquot * const *dquots;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679
Christoph Hellwig189eef52010-06-04 10:56:29 +02001680 if (!dquot_active(inode))
Christoph Hellwig63936dd2010-03-03 09:05:01 -05001681 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
Jan Karabf097aa2012-02-14 13:28:01 +01001683 warn[cnt].w_type = QUOTA_NL_NOWARN;
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001684
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001685 dquots = i_dquot(inode);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001686 index = srcu_read_lock(&dquot_srcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687 spin_lock(&dq_data_lock);
1688 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Jan Karabf097aa2012-02-14 13:28:01 +01001689 if (!dquots[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690 continue;
Jan Karabf097aa2012-02-14 13:28:01 +01001691 ret = check_idq(dquots[cnt], 1, &warn[cnt]);
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001692 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 goto warn_put_all;
1694 }
1695
1696 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Jan Karabf097aa2012-02-14 13:28:01 +01001697 if (!dquots[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698 continue;
Jan Karabf097aa2012-02-14 13:28:01 +01001699 dquot_incr_inodes(dquots[cnt], 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 }
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001701
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702warn_put_all:
1703 spin_unlock(&dq_data_lock);
Christoph Hellwig63936dd2010-03-03 09:05:01 -05001704 if (ret == 0)
Jan Karabf097aa2012-02-14 13:28:01 +01001705 mark_all_dquot_dirty(dquots);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001706 srcu_read_unlock(&dquot_srcu, index);
Jan Karabf097aa2012-02-14 13:28:01 +01001707 flush_warnings(warn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708 return ret;
1709}
Mingming Cao08d03502009-01-14 16:19:32 +01001710EXPORT_SYMBOL(dquot_alloc_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001712/*
1713 * Convert in-memory reserved quotas to real consumed quotas
1714 */
1715int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
Mingming Cao740d9dc2009-01-13 16:43:14 +01001716{
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001717 struct dquot **dquots;
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001718 int cnt, index;
Mingming Cao740d9dc2009-01-13 16:43:14 +01001719
Christoph Hellwig189eef52010-06-04 10:56:29 +02001720 if (!dquot_active(inode)) {
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001721 inode_claim_rsv_space(inode, number);
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001722 return 0;
Mingming Cao740d9dc2009-01-13 16:43:14 +01001723 }
1724
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001725 dquots = i_dquot(inode);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001726 index = srcu_read_lock(&dquot_srcu);
Mingming Cao740d9dc2009-01-13 16:43:14 +01001727 spin_lock(&dq_data_lock);
1728 /* Claim reserved quotas to allocated quotas */
1729 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001730 if (dquots[cnt])
1731 dquot_claim_reserved_space(dquots[cnt], number);
Mingming Cao740d9dc2009-01-13 16:43:14 +01001732 }
1733 /* Update inode bytes */
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001734 inode_claim_rsv_space(inode, number);
Mingming Cao740d9dc2009-01-13 16:43:14 +01001735 spin_unlock(&dq_data_lock);
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001736 mark_all_dquot_dirty(dquots);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001737 srcu_read_unlock(&dquot_srcu, index);
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001738 return 0;
Mingming Cao740d9dc2009-01-13 16:43:14 +01001739}
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001740EXPORT_SYMBOL(dquot_claim_space_nodirty);
Mingming Cao740d9dc2009-01-13 16:43:14 +01001741
1742/*
Jan Kara1c8924e2013-08-17 09:32:32 -04001743 * Convert allocated space back to in-memory reserved quotas
1744 */
1745void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number)
1746{
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001747 struct dquot **dquots;
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001748 int cnt, index;
Jan Kara1c8924e2013-08-17 09:32:32 -04001749
1750 if (!dquot_active(inode)) {
1751 inode_reclaim_rsv_space(inode, number);
1752 return;
1753 }
1754
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001755 dquots = i_dquot(inode);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001756 index = srcu_read_lock(&dquot_srcu);
Jan Kara1c8924e2013-08-17 09:32:32 -04001757 spin_lock(&dq_data_lock);
1758 /* Claim reserved quotas to allocated quotas */
1759 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001760 if (dquots[cnt])
1761 dquot_reclaim_reserved_space(dquots[cnt], number);
Jan Kara1c8924e2013-08-17 09:32:32 -04001762 }
1763 /* Update inode bytes */
1764 inode_reclaim_rsv_space(inode, number);
1765 spin_unlock(&dq_data_lock);
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001766 mark_all_dquot_dirty(dquots);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001767 srcu_read_unlock(&dquot_srcu, index);
Jan Kara1c8924e2013-08-17 09:32:32 -04001768 return;
1769}
1770EXPORT_SYMBOL(dquot_reclaim_space_nodirty);
1771
1772/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773 * This operation can block, but only after everything is updated
1774 */
Eric Sandeen56246f92010-05-16 09:00:00 -04001775void __dquot_free_space(struct inode *inode, qsize_t number, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776{
1777 unsigned int cnt;
Jan Karabf097aa2012-02-14 13:28:01 +01001778 struct dquot_warn warn[MAXQUOTAS];
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001779 struct dquot **dquots;
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001780 int reserve = flags & DQUOT_SPACE_RESERVE, index;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781
Christoph Hellwig189eef52010-06-04 10:56:29 +02001782 if (!dquot_active(inode)) {
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001783 inode_decr_space(inode, number, reserve);
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001784 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785 }
Jan Kara657d3bf2008-07-25 01:46:52 -07001786
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001787 dquots = i_dquot(inode);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001788 index = srcu_read_lock(&dquot_srcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 spin_lock(&dq_data_lock);
1790 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Jan Karabf097aa2012-02-14 13:28:01 +01001791 int wtype;
1792
1793 warn[cnt].w_type = QUOTA_NL_NOWARN;
1794 if (!dquots[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795 continue;
Jan Karabf097aa2012-02-14 13:28:01 +01001796 wtype = info_bdq_free(dquots[cnt], number);
1797 if (wtype != QUOTA_NL_NOWARN)
1798 prepare_warning(&warn[cnt], dquots[cnt], wtype);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001799 if (reserve)
Jan Karabf097aa2012-02-14 13:28:01 +01001800 dquot_free_reserved_space(dquots[cnt], number);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001801 else
Jan Karabf097aa2012-02-14 13:28:01 +01001802 dquot_decr_space(dquots[cnt], number);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803 }
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001804 inode_decr_space(inode, number, reserve);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 spin_unlock(&dq_data_lock);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001806
1807 if (reserve)
1808 goto out_unlock;
Jan Karabf097aa2012-02-14 13:28:01 +01001809 mark_all_dquot_dirty(dquots);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001810out_unlock:
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001811 srcu_read_unlock(&dquot_srcu, index);
Jan Karabf097aa2012-02-14 13:28:01 +01001812 flush_warnings(warn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813}
Christoph Hellwig5dd40562010-03-03 09:05:00 -05001814EXPORT_SYMBOL(__dquot_free_space);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001815
1816/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 * This operation can block, but only after everything is updated
1818 */
Jan Kara6bab3592014-10-20 16:01:33 +02001819void dquot_free_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001820{
1821 unsigned int cnt;
Jan Karabf097aa2012-02-14 13:28:01 +01001822 struct dquot_warn warn[MAXQUOTAS];
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001823 struct dquot * const *dquots;
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001824 int index;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001825
Christoph Hellwig189eef52010-06-04 10:56:29 +02001826 if (!dquot_active(inode))
Christoph Hellwig63936dd2010-03-03 09:05:01 -05001827 return;
Jan Kara657d3bf2008-07-25 01:46:52 -07001828
Konstantin Khlebnikov5bcd3b62015-02-12 12:36:37 +03001829 dquots = i_dquot(inode);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001830 index = srcu_read_lock(&dquot_srcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831 spin_lock(&dq_data_lock);
1832 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Jan Karabf097aa2012-02-14 13:28:01 +01001833 int wtype;
1834
1835 warn[cnt].w_type = QUOTA_NL_NOWARN;
1836 if (!dquots[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001837 continue;
Jan Karabf097aa2012-02-14 13:28:01 +01001838 wtype = info_idq_free(dquots[cnt], 1);
1839 if (wtype != QUOTA_NL_NOWARN)
1840 prepare_warning(&warn[cnt], dquots[cnt], wtype);
1841 dquot_decr_inodes(dquots[cnt], 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842 }
1843 spin_unlock(&dq_data_lock);
Jan Karabf097aa2012-02-14 13:28:01 +01001844 mark_all_dquot_dirty(dquots);
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001845 srcu_read_unlock(&dquot_srcu, index);
Jan Karabf097aa2012-02-14 13:28:01 +01001846 flush_warnings(warn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847}
Mingming Cao08d03502009-01-14 16:19:32 +01001848EXPORT_SYMBOL(dquot_free_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849
1850/*
1851 * Transfer the number of inode and blocks from one diskquota to an other.
Jan Karabc8e5f02010-05-13 19:58:50 +02001852 * On success, dquot references in transfer_to are consumed and references
1853 * to original dquots that need to be released are placed there. On failure,
1854 * references are kept untouched.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001855 *
1856 * This operation can block, but only after everything is updated
1857 * A transaction must be started when entering this function.
Jan Karabc8e5f02010-05-13 19:58:50 +02001858 *
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001859 * We are holding reference on transfer_from & transfer_to, no need to
1860 * protect them by srcu_read_lock().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861 */
Jan Karabc8e5f02010-05-13 19:58:50 +02001862int __dquot_transfer(struct inode *inode, struct dquot **transfer_to)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863{
Mingming Cao740d9dc2009-01-13 16:43:14 +01001864 qsize_t space, cur_space;
1865 qsize_t rsv_space = 0;
Jan Karabc8e5f02010-05-13 19:58:50 +02001866 struct dquot *transfer_from[MAXQUOTAS] = {};
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001867 int cnt, ret = 0;
Dmitry9e327842010-10-09 23:15:30 +04001868 char is_valid[MAXQUOTAS] = {};
Jan Karabf097aa2012-02-14 13:28:01 +01001869 struct dquot_warn warn_to[MAXQUOTAS];
1870 struct dquot_warn warn_from_inodes[MAXQUOTAS];
1871 struct dquot_warn warn_from_space[MAXQUOTAS];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873 if (IS_NOQUOTA(inode))
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001874 return 0;
Jan Karacc334122009-01-12 17:23:05 +01001875 /* Initialize the arrays */
Jan Karabf097aa2012-02-14 13:28:01 +01001876 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
1877 warn_to[cnt].w_type = QUOTA_NL_NOWARN;
1878 warn_from_inodes[cnt].w_type = QUOTA_NL_NOWARN;
1879 warn_from_space[cnt].w_type = QUOTA_NL_NOWARN;
1880 }
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001881
1882 spin_lock(&dq_data_lock);
Jan Karacc334122009-01-12 17:23:05 +01001883 if (IS_NOQUOTA(inode)) { /* File without quota accounting? */
Niu Yaweib9ba6f92014-06-04 12:23:19 +08001884 spin_unlock(&dq_data_lock);
Jan Karabc8e5f02010-05-13 19:58:50 +02001885 return 0;
Jan Karacc334122009-01-12 17:23:05 +01001886 }
Mingming Cao740d9dc2009-01-13 16:43:14 +01001887 cur_space = inode_get_bytes(inode);
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +03001888 rsv_space = inode_get_rsv_space(inode);
Mingming Cao740d9dc2009-01-13 16:43:14 +01001889 space = cur_space + rsv_space;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890 /* Build the transfer_from list and check the limits */
1891 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Dmitry9e327842010-10-09 23:15:30 +04001892 /*
1893 * Skip changes for same uid or gid or for turned off quota-type.
1894 */
Jan Karadd6f3c62009-01-26 16:01:43 +01001895 if (!transfer_to[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896 continue;
Dmitry9e327842010-10-09 23:15:30 +04001897 /* Avoid races with quotaoff() */
1898 if (!sb_has_quota_active(inode->i_sb, cnt))
1899 continue;
1900 is_valid[cnt] = 1;
Jan Kara2d0fa462014-09-25 16:36:14 +02001901 transfer_from[cnt] = i_dquot(inode)[cnt];
Jan Karabf097aa2012-02-14 13:28:01 +01001902 ret = check_idq(transfer_to[cnt], 1, &warn_to[cnt]);
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001903 if (ret)
1904 goto over_quota;
Jan Karabf097aa2012-02-14 13:28:01 +01001905 ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]);
Christoph Hellwigefd8f0e2010-03-03 09:05:08 -05001906 if (ret)
Jan Karacc334122009-01-12 17:23:05 +01001907 goto over_quota;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001908 }
1909
1910 /*
1911 * Finally perform the needed transfer from transfer_from to transfer_to
1912 */
1913 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
Dmitry9e327842010-10-09 23:15:30 +04001914 if (!is_valid[cnt])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916 /* Due to IO error we might not have transfer_from[] structure */
1917 if (transfer_from[cnt]) {
Jan Karabf097aa2012-02-14 13:28:01 +01001918 int wtype;
1919 wtype = info_idq_free(transfer_from[cnt], 1);
1920 if (wtype != QUOTA_NL_NOWARN)
1921 prepare_warning(&warn_from_inodes[cnt],
1922 transfer_from[cnt], wtype);
1923 wtype = info_bdq_free(transfer_from[cnt], space);
1924 if (wtype != QUOTA_NL_NOWARN)
1925 prepare_warning(&warn_from_space[cnt],
1926 transfer_from[cnt], wtype);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927 dquot_decr_inodes(transfer_from[cnt], 1);
Mingming Cao740d9dc2009-01-13 16:43:14 +01001928 dquot_decr_space(transfer_from[cnt], cur_space);
1929 dquot_free_reserved_space(transfer_from[cnt],
1930 rsv_space);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931 }
1932
1933 dquot_incr_inodes(transfer_to[cnt], 1);
Mingming Cao740d9dc2009-01-13 16:43:14 +01001934 dquot_incr_space(transfer_to[cnt], cur_space);
1935 dquot_resv_space(transfer_to[cnt], rsv_space);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936
Jan Kara2d0fa462014-09-25 16:36:14 +02001937 i_dquot(inode)[cnt] = transfer_to[cnt];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939 spin_unlock(&dq_data_lock);
Jan Karacc334122009-01-12 17:23:05 +01001940
Dmitry Monakhovdc52dd32009-12-14 15:21:15 +03001941 mark_all_dquot_dirty(transfer_from);
1942 mark_all_dquot_dirty(transfer_to);
Jan Karabf097aa2012-02-14 13:28:01 +01001943 flush_warnings(warn_to);
1944 flush_warnings(warn_from_inodes);
1945 flush_warnings(warn_from_space);
Jan Karabc8e5f02010-05-13 19:58:50 +02001946 /* Pass back references to put */
Dmitry Monakhovdc52dd32009-12-14 15:21:15 +03001947 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
Dmitry9e327842010-10-09 23:15:30 +04001948 if (is_valid[cnt])
1949 transfer_to[cnt] = transfer_from[cnt];
Jan Kara86f3cbe2010-10-11 15:22:21 +02001950 return 0;
Jan Karacc334122009-01-12 17:23:05 +01001951over_quota:
1952 spin_unlock(&dq_data_lock);
Jan Karabf097aa2012-02-14 13:28:01 +01001953 flush_warnings(warn_to);
Jan Kara86f3cbe2010-10-11 15:22:21 +02001954 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001955}
Jan Karabc8e5f02010-05-13 19:58:50 +02001956EXPORT_SYMBOL(__dquot_transfer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001957
Dmitry Monakhov8ddd69d2010-02-16 08:31:50 +03001958/* Wrapper for transferring ownership of an inode for uid/gid only
1959 * Called from FSXXX_setattr()
1960 */
Christoph Hellwigb43fa822010-03-03 09:05:03 -05001961int dquot_transfer(struct inode *inode, struct iattr *iattr)
Jan Karab85f4b82008-07-25 01:46:50 -07001962{
Jan Karabc8e5f02010-05-13 19:58:50 +02001963 struct dquot *transfer_to[MAXQUOTAS] = {};
1964 struct super_block *sb = inode->i_sb;
1965 int ret;
Dmitry Monakhov8ddd69d2010-02-16 08:31:50 +03001966
Christoph Hellwig189eef52010-06-04 10:56:29 +02001967 if (!dquot_active(inode))
Jan Karabc8e5f02010-05-13 19:58:50 +02001968 return 0;
Dmitry Monakhov12755622010-04-08 22:04:20 +04001969
Eric W. Biederman1a06d422012-09-16 05:45:30 -07001970 if (iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid))
Eric W. Biedermanaca645a2012-09-16 03:11:50 -07001971 transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(iattr->ia_uid));
Eric W. Biederman1a06d422012-09-16 05:45:30 -07001972 if (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))
Eric W. Biedermanaca645a2012-09-16 03:11:50 -07001973 transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(iattr->ia_gid));
Jan Karabc8e5f02010-05-13 19:58:50 +02001974
1975 ret = __dquot_transfer(inode, transfer_to);
1976 dqput_all(transfer_to);
1977 return ret;
Jan Karab85f4b82008-07-25 01:46:50 -07001978}
Christoph Hellwigb43fa822010-03-03 09:05:03 -05001979EXPORT_SYMBOL(dquot_transfer);
Jan Karab85f4b82008-07-25 01:46:50 -07001980
Linus Torvalds1da177e2005-04-16 15:20:36 -07001981/*
1982 * Write info of quota file to disk
1983 */
1984int dquot_commit_info(struct super_block *sb, int type)
1985{
1986 int ret;
1987 struct quota_info *dqopt = sb_dqopt(sb);
1988
Ingo Molnard3be9152006-03-23 03:00:29 -08001989 mutex_lock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990 ret = dqopt->ops[type]->write_file_info(sb, type);
Ingo Molnard3be9152006-03-23 03:00:29 -08001991 mutex_unlock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001992 return ret;
1993}
Mingming Cao08d03502009-01-14 16:19:32 +01001994EXPORT_SYMBOL(dquot_commit_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995
1996/*
1997 * Definitions of diskquota operations.
1998 */
Alexey Dobriyan61e225d2009-09-21 17:01:08 -07001999const struct dquot_operations dquot_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000 .write_dquot = dquot_commit,
2001 .acquire_dquot = dquot_acquire,
2002 .release_dquot = dquot_release,
2003 .mark_dirty = dquot_mark_dquot_dirty,
Jan Kara74f783a2008-08-19 14:51:22 +02002004 .write_info = dquot_commit_info,
2005 .alloc_dquot = dquot_alloc,
2006 .destroy_dquot = dquot_destroy,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007};
Christoph Hellwig123e9ca2010-05-19 07:16:44 -04002008EXPORT_SYMBOL(dquot_operations);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002009
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010/*
Christoph Hellwig907f4552010-03-03 09:05:06 -05002011 * Generic helper for ->open on filesystems supporting disk quotas.
2012 */
2013int dquot_file_open(struct inode *inode, struct file *file)
2014{
2015 int error;
2016
2017 error = generic_file_open(inode, file);
2018 if (!error && (file->f_mode & FMODE_WRITE))
Christoph Hellwig871a2932010-03-03 09:05:07 -05002019 dquot_initialize(inode);
Christoph Hellwig907f4552010-03-03 09:05:06 -05002020 return error;
2021}
2022EXPORT_SYMBOL(dquot_file_open);
2023
2024/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002025 * Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
2026 */
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002027int dquot_disable(struct super_block *sb, int type, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028{
Jan Kara0ff5af82008-04-28 02:14:33 -07002029 int cnt, ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030 struct quota_info *dqopt = sb_dqopt(sb);
2031 struct inode *toputinode[MAXQUOTAS];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032
Jan Karaf55abc02008-08-20 17:50:32 +02002033 /* Cannot turn off usage accounting without turning off limits, or
2034 * suspend quotas and simultaneously turn quotas off. */
2035 if ((flags & DQUOT_USAGE_ENABLED && !(flags & DQUOT_LIMITS_ENABLED))
2036 || (flags & DQUOT_SUSPENDED && flags & (DQUOT_LIMITS_ENABLED |
2037 DQUOT_USAGE_ENABLED)))
2038 return -EINVAL;
2039
Linus Torvalds1da177e2005-04-16 15:20:36 -07002040 /* We need to serialize quota_off() for device */
Ingo Molnard3be9152006-03-23 03:00:29 -08002041 mutex_lock(&dqopt->dqonoff_mutex);
Jan Kara9377abd2008-05-12 14:02:08 -07002042
2043 /*
2044 * Skip everything if there's nothing to do. We have to do this because
2045 * sometimes we are called when fill_super() failed and calling
2046 * sync_fs() in such cases does no good.
2047 */
Jan Karaf55abc02008-08-20 17:50:32 +02002048 if (!sb_any_quota_loaded(sb)) {
Jan Kara9377abd2008-05-12 14:02:08 -07002049 mutex_unlock(&dqopt->dqonoff_mutex);
2050 return 0;
2051 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
2053 toputinode[cnt] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002054 if (type != -1 && cnt != type)
2055 continue;
Jan Karaf55abc02008-08-20 17:50:32 +02002056 if (!sb_has_quota_loaded(sb, cnt))
Jan Kara0ff5af82008-04-28 02:14:33 -07002057 continue;
Jan Karaf55abc02008-08-20 17:50:32 +02002058
2059 if (flags & DQUOT_SUSPENDED) {
Jan Karacc334122009-01-12 17:23:05 +01002060 spin_lock(&dq_state_lock);
Jan Karaf55abc02008-08-20 17:50:32 +02002061 dqopt->flags |=
2062 dquot_state_flag(DQUOT_SUSPENDED, cnt);
Jan Karacc334122009-01-12 17:23:05 +01002063 spin_unlock(&dq_state_lock);
Jan Karaf55abc02008-08-20 17:50:32 +02002064 } else {
Jan Karacc334122009-01-12 17:23:05 +01002065 spin_lock(&dq_state_lock);
Jan Karaf55abc02008-08-20 17:50:32 +02002066 dqopt->flags &= ~dquot_state_flag(flags, cnt);
2067 /* Turning off suspended quotas? */
2068 if (!sb_has_quota_loaded(sb, cnt) &&
2069 sb_has_quota_suspended(sb, cnt)) {
2070 dqopt->flags &= ~dquot_state_flag(
2071 DQUOT_SUSPENDED, cnt);
Jan Karacc334122009-01-12 17:23:05 +01002072 spin_unlock(&dq_state_lock);
Jan Karaf55abc02008-08-20 17:50:32 +02002073 iput(dqopt->files[cnt]);
2074 dqopt->files[cnt] = NULL;
2075 continue;
2076 }
Jan Karacc334122009-01-12 17:23:05 +01002077 spin_unlock(&dq_state_lock);
Jan Kara0ff5af82008-04-28 02:14:33 -07002078 }
Jan Karaf55abc02008-08-20 17:50:32 +02002079
2080 /* We still have to keep quota loaded? */
2081 if (sb_has_quota_loaded(sb, cnt) && !(flags & DQUOT_SUSPENDED))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002082 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002083
2084 /* Note: these are blocking operations */
2085 drop_dquot_ref(sb, cnt);
2086 invalidate_dquots(sb, cnt);
2087 /*
Jan Kara268157b2009-01-27 15:47:22 +01002088 * Now all dquots should be invalidated, all writes done so we
2089 * should be only users of the info. No locks needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002090 */
2091 if (info_dirty(&dqopt->info[cnt]))
2092 sb->dq_op->write_info(sb, cnt);
2093 if (dqopt->ops[cnt]->free_file_info)
2094 dqopt->ops[cnt]->free_file_info(sb, cnt);
2095 put_quota_format(dqopt->info[cnt].dqi_format);
2096
2097 toputinode[cnt] = dqopt->files[cnt];
Jan Karaf55abc02008-08-20 17:50:32 +02002098 if (!sb_has_quota_loaded(sb, cnt))
Jan Kara0ff5af82008-04-28 02:14:33 -07002099 dqopt->files[cnt] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002100 dqopt->info[cnt].dqi_flags = 0;
2101 dqopt->info[cnt].dqi_igrace = 0;
2102 dqopt->info[cnt].dqi_bgrace = 0;
2103 dqopt->ops[cnt] = NULL;
2104 }
Ingo Molnard3be9152006-03-23 03:00:29 -08002105 mutex_unlock(&dqopt->dqonoff_mutex);
Jan Karaca785ec2008-09-30 17:53:37 +02002106
2107 /* Skip syncing and setting flags if quota files are hidden */
2108 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
2109 goto put_inodes;
2110
Linus Torvalds1da177e2005-04-16 15:20:36 -07002111 /* Sync the superblock so that buffers with quota data are written to
Al Viro7b7b1ac2005-11-07 17:13:39 -05002112 * disk (and so userspace sees correct data afterwards). */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002113 if (sb->s_op->sync_fs)
2114 sb->s_op->sync_fs(sb, 1);
2115 sync_blockdev(sb->s_bdev);
2116 /* Now the quota files are just ordinary files and we can set the
2117 * inode flags back. Moreover we discard the pagecache so that
2118 * userspace sees the writes we did bypassing the pagecache. We
2119 * must also discard the blockdev buffers so that we see the
2120 * changes done by userspace on the next quotaon() */
2121 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
2122 if (toputinode[cnt]) {
Ingo Molnard3be9152006-03-23 03:00:29 -08002123 mutex_lock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002124 /* If quota was reenabled in the meantime, we have
2125 * nothing to do */
Jan Karaf55abc02008-08-20 17:50:32 +02002126 if (!sb_has_quota_loaded(sb, cnt)) {
Jan Karaa80b12c2012-04-25 21:15:53 +02002127 mutex_lock(&toputinode[cnt]->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002128 toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
2129 S_NOATIME | S_NOQUOTA);
Jan Kara268157b2009-01-27 15:47:22 +01002130 truncate_inode_pages(&toputinode[cnt]->i_data,
2131 0);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002132 mutex_unlock(&toputinode[cnt]->i_mutex);
Jan Kara43d29322010-07-21 14:22:21 +02002133 mark_inode_dirty_sync(toputinode[cnt]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002134 }
Ingo Molnard3be9152006-03-23 03:00:29 -08002135 mutex_unlock(&dqopt->dqonoff_mutex);
Jan Karaca785ec2008-09-30 17:53:37 +02002136 }
2137 if (sb->s_bdev)
2138 invalidate_bdev(sb->s_bdev);
2139put_inodes:
2140 for (cnt = 0; cnt < MAXQUOTAS; cnt++)
2141 if (toputinode[cnt]) {
Jan Kara0ff5af82008-04-28 02:14:33 -07002142 /* On remount RO, we keep the inode pointer so that we
Jan Karaf55abc02008-08-20 17:50:32 +02002143 * can reenable quota on the subsequent remount RW. We
2144 * have to check 'flags' variable and not use sb_has_
2145 * function because another quotaon / quotaoff could
2146 * change global state before we got here. We refuse
2147 * to suspend quotas when there is pending delete on
2148 * the quota file... */
2149 if (!(flags & DQUOT_SUSPENDED))
Jan Kara0ff5af82008-04-28 02:14:33 -07002150 iput(toputinode[cnt]);
2151 else if (!toputinode[cnt]->i_nlink)
2152 ret = -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002153 }
Jan Kara0ff5af82008-04-28 02:14:33 -07002154 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155}
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002156EXPORT_SYMBOL(dquot_disable);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002157
Christoph Hellwig287a8092010-05-19 07:16:45 -04002158int dquot_quota_off(struct super_block *sb, int type)
Jan Karaf55abc02008-08-20 17:50:32 +02002159{
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002160 return dquot_disable(sb, type,
2161 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
Jan Karaf55abc02008-08-20 17:50:32 +02002162}
Christoph Hellwig287a8092010-05-19 07:16:45 -04002163EXPORT_SYMBOL(dquot_quota_off);
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002164
Linus Torvalds1da177e2005-04-16 15:20:36 -07002165/*
2166 * Turn quotas on on a device
2167 */
2168
Jan Karaf55abc02008-08-20 17:50:32 +02002169/*
2170 * Helper function to turn quotas on when we already have the inode of
2171 * quota file and no quota information is loaded.
2172 */
2173static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
2174 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175{
2176 struct quota_format_type *fmt = find_quota_format(format_id);
2177 struct super_block *sb = inode->i_sb;
2178 struct quota_info *dqopt = sb_dqopt(sb);
2179 int error;
2180 int oldflags = -1;
2181
2182 if (!fmt)
2183 return -ESRCH;
2184 if (!S_ISREG(inode->i_mode)) {
2185 error = -EACCES;
2186 goto out_fmt;
2187 }
2188 if (IS_RDONLY(inode)) {
2189 error = -EROFS;
2190 goto out_fmt;
2191 }
Li Xi847aac62015-03-19 04:04:53 +09002192 if (!sb->s_op->quota_write || !sb->s_op->quota_read ||
2193 (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194 error = -EINVAL;
2195 goto out_fmt;
2196 }
Jan Karaf55abc02008-08-20 17:50:32 +02002197 /* Usage always has to be set... */
2198 if (!(flags & DQUOT_USAGE_ENABLED)) {
2199 error = -EINVAL;
2200 goto out_fmt;
2201 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002202
Jan Karaca785ec2008-09-30 17:53:37 +02002203 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
Jan Karaab94c392010-02-22 21:07:17 +01002204 /* As we bypass the pagecache we must now flush all the
2205 * dirty data and invalidate caches so that kernel sees
2206 * changes from userspace. It is not enough to just flush
2207 * the quota file since if blocksize < pagesize, invalidation
2208 * of the cache could fail because of other unrelated dirty
2209 * data */
2210 sync_filesystem(sb);
Jan Karaca785ec2008-09-30 17:53:37 +02002211 invalidate_bdev(sb->s_bdev);
2212 }
Ingo Molnard3be9152006-03-23 03:00:29 -08002213 mutex_lock(&dqopt->dqonoff_mutex);
Jan Karaf55abc02008-08-20 17:50:32 +02002214 if (sb_has_quota_loaded(sb, type)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002215 error = -EBUSY;
2216 goto out_lock;
2217 }
Jan Karaca785ec2008-09-30 17:53:37 +02002218
2219 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
2220 /* We don't want quota and atime on quota files (deadlocks
2221 * possible) Also nobody should write to the file - we use
2222 * special IO operations which ignore the immutable bit. */
Jan Karaa80b12c2012-04-25 21:15:53 +02002223 mutex_lock(&inode->i_mutex);
Jan Kara268157b2009-01-27 15:47:22 +01002224 oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE |
2225 S_NOQUOTA);
Jan Karaca785ec2008-09-30 17:53:37 +02002226 inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
Jan Karadee86562009-07-22 18:12:17 +02002227 mutex_unlock(&inode->i_mutex);
Jan Kara26245c92010-01-06 17:20:35 +01002228 /*
2229 * When S_NOQUOTA is set, remove dquot references as no more
2230 * references can be added
2231 */
Christoph Hellwig9f754752010-03-03 09:05:05 -05002232 __dquot_drop(inode);
Jan Karaca785ec2008-09-30 17:53:37 +02002233 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002234
2235 error = -EIO;
2236 dqopt->files[type] = igrab(inode);
2237 if (!dqopt->files[type])
2238 goto out_lock;
2239 error = -EINVAL;
2240 if (!fmt->qf_ops->check_quota_file(sb, type))
2241 goto out_file_init;
2242
2243 dqopt->ops[type] = fmt->qf_ops;
2244 dqopt->info[type].dqi_format = fmt;
Jan Kara0ff5af82008-04-28 02:14:33 -07002245 dqopt->info[type].dqi_fmt_id = format_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002246 INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
Ingo Molnard3be9152006-03-23 03:00:29 -08002247 mutex_lock(&dqopt->dqio_mutex);
Jan Kara268157b2009-01-27 15:47:22 +01002248 error = dqopt->ops[type]->read_file_info(sb, type);
2249 if (error < 0) {
Ingo Molnard3be9152006-03-23 03:00:29 -08002250 mutex_unlock(&dqopt->dqio_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002251 goto out_file_init;
2252 }
Jan Kara46fe44c2011-11-16 15:03:59 +01002253 if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
2254 dqopt->info[type].dqi_flags |= DQF_SYS_FILE;
Ingo Molnard3be9152006-03-23 03:00:29 -08002255 mutex_unlock(&dqopt->dqio_mutex);
Jan Karacc334122009-01-12 17:23:05 +01002256 spin_lock(&dq_state_lock);
Jan Karaf55abc02008-08-20 17:50:32 +02002257 dqopt->flags |= dquot_state_flag(flags, type);
Jan Karacc334122009-01-12 17:23:05 +01002258 spin_unlock(&dq_state_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002259
2260 add_dquot_ref(sb, type);
Ingo Molnard3be9152006-03-23 03:00:29 -08002261 mutex_unlock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002262
2263 return 0;
2264
2265out_file_init:
2266 dqopt->files[type] = NULL;
2267 iput(inode);
2268out_lock:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002269 if (oldflags != -1) {
Jan Karaa80b12c2012-04-25 21:15:53 +02002270 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002271 /* Set the flags back (in the case of accidental quotaon()
2272 * on a wrong file we don't want to mess up the flags) */
2273 inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);
2274 inode->i_flags |= oldflags;
Jan Karadee86562009-07-22 18:12:17 +02002275 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002276 }
Jiaying Zhangd01730d2009-07-07 18:15:21 +02002277 mutex_unlock(&dqopt->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002278out_fmt:
2279 put_quota_format(fmt);
2280
2281 return error;
2282}
2283
Jan Kara0ff5af82008-04-28 02:14:33 -07002284/* Reenable quotas on remount RW */
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002285int dquot_resume(struct super_block *sb, int type)
Jan Kara0ff5af82008-04-28 02:14:33 -07002286{
2287 struct quota_info *dqopt = sb_dqopt(sb);
2288 struct inode *inode;
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002289 int ret = 0, cnt;
Jan Karaf55abc02008-08-20 17:50:32 +02002290 unsigned int flags;
Jan Kara0ff5af82008-04-28 02:14:33 -07002291
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002292 for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
2293 if (type != -1 && cnt != type)
2294 continue;
Jan Kara0ff5af82008-04-28 02:14:33 -07002295
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002296 mutex_lock(&dqopt->dqonoff_mutex);
2297 if (!sb_has_quota_suspended(sb, cnt)) {
2298 mutex_unlock(&dqopt->dqonoff_mutex);
2299 continue;
2300 }
2301 inode = dqopt->files[cnt];
2302 dqopt->files[cnt] = NULL;
2303 spin_lock(&dq_state_lock);
2304 flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
2305 DQUOT_LIMITS_ENABLED,
2306 cnt);
2307 dqopt->flags &= ~dquot_state_flag(DQUOT_STATE_FLAGS, cnt);
2308 spin_unlock(&dq_state_lock);
2309 mutex_unlock(&dqopt->dqonoff_mutex);
2310
2311 flags = dquot_generic_flag(flags, cnt);
2312 ret = vfs_load_quota_inode(inode, cnt,
2313 dqopt->info[cnt].dqi_fmt_id, flags);
2314 iput(inode);
2315 }
Jan Kara0ff5af82008-04-28 02:14:33 -07002316
2317 return ret;
2318}
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002319EXPORT_SYMBOL(dquot_resume);
Jan Kara0ff5af82008-04-28 02:14:33 -07002320
Jan Karaf00c9e42010-09-15 17:38:58 +02002321int dquot_quota_on(struct super_block *sb, int type, int format_id,
2322 struct path *path)
Al Viro77e69da2008-08-01 04:29:18 -04002323{
2324 int error = security_quota_on(path->dentry);
2325 if (error)
2326 return error;
2327 /* Quota file not on the same filesystem? */
Al Virod8c95842011-12-07 18:16:57 -05002328 if (path->dentry->d_sb != sb)
Al Viro77e69da2008-08-01 04:29:18 -04002329 error = -EXDEV;
2330 else
David Howellsdea655c2015-03-17 22:26:15 +00002331 error = vfs_load_quota_inode(d_inode(path->dentry), type,
Jan Karaf55abc02008-08-20 17:50:32 +02002332 format_id, DQUOT_USAGE_ENABLED |
2333 DQUOT_LIMITS_ENABLED);
Al Viro77e69da2008-08-01 04:29:18 -04002334 return error;
2335}
Christoph Hellwig287a8092010-05-19 07:16:45 -04002336EXPORT_SYMBOL(dquot_quota_on);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002337
2338/*
Jan Karaf55abc02008-08-20 17:50:32 +02002339 * More powerful function for turning on quotas allowing setting
2340 * of individual quota flags
2341 */
Christoph Hellwig287a8092010-05-19 07:16:45 -04002342int dquot_enable(struct inode *inode, int type, int format_id,
2343 unsigned int flags)
Jan Karaf55abc02008-08-20 17:50:32 +02002344{
2345 int ret = 0;
2346 struct super_block *sb = inode->i_sb;
2347 struct quota_info *dqopt = sb_dqopt(sb);
2348
2349 /* Just unsuspend quotas? */
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04002350 BUG_ON(flags & DQUOT_SUSPENDED);
2351
Jan Karaf55abc02008-08-20 17:50:32 +02002352 if (!flags)
2353 return 0;
2354 /* Just updating flags needed? */
2355 if (sb_has_quota_loaded(sb, type)) {
2356 mutex_lock(&dqopt->dqonoff_mutex);
2357 /* Now do a reliable test... */
2358 if (!sb_has_quota_loaded(sb, type)) {
2359 mutex_unlock(&dqopt->dqonoff_mutex);
2360 goto load_quota;
2361 }
2362 if (flags & DQUOT_USAGE_ENABLED &&
2363 sb_has_quota_usage_enabled(sb, type)) {
2364 ret = -EBUSY;
2365 goto out_lock;
2366 }
2367 if (flags & DQUOT_LIMITS_ENABLED &&
2368 sb_has_quota_limits_enabled(sb, type)) {
2369 ret = -EBUSY;
2370 goto out_lock;
2371 }
Jan Karacc334122009-01-12 17:23:05 +01002372 spin_lock(&dq_state_lock);
Jan Karaf55abc02008-08-20 17:50:32 +02002373 sb_dqopt(sb)->flags |= dquot_state_flag(flags, type);
Jan Karacc334122009-01-12 17:23:05 +01002374 spin_unlock(&dq_state_lock);
Jan Karaf55abc02008-08-20 17:50:32 +02002375out_lock:
2376 mutex_unlock(&dqopt->dqonoff_mutex);
2377 return ret;
2378 }
2379
2380load_quota:
2381 return vfs_load_quota_inode(inode, type, format_id, flags);
2382}
Christoph Hellwig287a8092010-05-19 07:16:45 -04002383EXPORT_SYMBOL(dquot_enable);
Jan Karaf55abc02008-08-20 17:50:32 +02002384
2385/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002386 * This function is used when filesystem needs to initialize quotas
2387 * during mount time.
2388 */
Christoph Hellwig287a8092010-05-19 07:16:45 -04002389int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
Christoph Hellwig84de8562005-06-23 00:09:16 -07002390 int format_id, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002391{
Christoph Hellwig84de8562005-06-23 00:09:16 -07002392 struct dentry *dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002393 int error;
2394
David Howellsdea655c2015-03-17 22:26:15 +00002395 mutex_lock(&d_inode(sb->s_root)->i_mutex);
Christoph Hellwig2fa389c2005-06-23 00:09:16 -07002396 dentry = lookup_one_len(qf_name, sb->s_root, strlen(qf_name));
David Howellsdea655c2015-03-17 22:26:15 +00002397 mutex_unlock(&d_inode(sb->s_root)->i_mutex);
Christoph Hellwig84de8562005-06-23 00:09:16 -07002398 if (IS_ERR(dentry))
2399 return PTR_ERR(dentry);
2400
David Howellsdea655c2015-03-17 22:26:15 +00002401 if (d_really_is_negative(dentry)) {
Jan Kara154f4842005-11-28 13:44:14 -08002402 error = -ENOENT;
2403 goto out;
2404 }
2405
Linus Torvalds1da177e2005-04-16 15:20:36 -07002406 error = security_quota_on(dentry);
Christoph Hellwig84de8562005-06-23 00:09:16 -07002407 if (!error)
David Howellsdea655c2015-03-17 22:26:15 +00002408 error = vfs_load_quota_inode(d_inode(dentry), type, format_id,
Jan Karaf55abc02008-08-20 17:50:32 +02002409 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
Christoph Hellwig84de8562005-06-23 00:09:16 -07002410
Jan Kara154f4842005-11-28 13:44:14 -08002411out:
Christoph Hellwig84de8562005-06-23 00:09:16 -07002412 dput(dentry);
2413 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002414}
Christoph Hellwig287a8092010-05-19 07:16:45 -04002415EXPORT_SYMBOL(dquot_quota_on_mount);
Jan Karab85f4b82008-07-25 01:46:50 -07002416
Jan Kara3e2af672014-10-06 18:40:51 +02002417static int dquot_quota_enable(struct super_block *sb, unsigned int flags)
2418{
2419 int ret;
2420 int type;
2421 struct quota_info *dqopt = sb_dqopt(sb);
2422
2423 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE))
2424 return -ENOSYS;
2425 /* Accounting cannot be turned on while fs is mounted */
2426 flags &= ~(FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT);
2427 if (!flags)
2428 return -EINVAL;
2429 for (type = 0; type < MAXQUOTAS; type++) {
2430 if (!(flags & qtype_enforce_flag(type)))
2431 continue;
2432 /* Can't enforce without accounting */
2433 if (!sb_has_quota_usage_enabled(sb, type))
2434 return -EINVAL;
2435 ret = dquot_enable(dqopt->files[type], type,
2436 dqopt->info[type].dqi_fmt_id,
2437 DQUOT_LIMITS_ENABLED);
2438 if (ret < 0)
2439 goto out_err;
2440 }
2441 return 0;
2442out_err:
2443 /* Backout enforcement enablement we already did */
2444 for (type--; type >= 0; type--) {
2445 if (flags & qtype_enforce_flag(type))
2446 dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
2447 }
2448 /* Error code translation for better compatibility with XFS */
2449 if (ret == -EBUSY)
2450 ret = -EEXIST;
2451 return ret;
2452}
2453
2454static int dquot_quota_disable(struct super_block *sb, unsigned int flags)
2455{
2456 int ret;
2457 int type;
2458 struct quota_info *dqopt = sb_dqopt(sb);
2459
2460 if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE))
2461 return -ENOSYS;
2462 /*
2463 * We don't support turning off accounting via quotactl. In principle
2464 * quota infrastructure can do this but filesystems don't expect
2465 * userspace to be able to do it.
2466 */
2467 if (flags &
2468 (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT | FS_QUOTA_PDQ_ACCT))
2469 return -EOPNOTSUPP;
2470
2471 /* Filter out limits not enabled */
2472 for (type = 0; type < MAXQUOTAS; type++)
2473 if (!sb_has_quota_limits_enabled(sb, type))
2474 flags &= ~qtype_enforce_flag(type);
2475 /* Nothing left? */
2476 if (!flags)
2477 return -EEXIST;
2478 for (type = 0; type < MAXQUOTAS; type++) {
2479 if (flags & qtype_enforce_flag(type)) {
2480 ret = dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
2481 if (ret < 0)
2482 goto out_err;
2483 }
2484 }
2485 return 0;
2486out_err:
2487 /* Backout enforcement disabling we already did */
2488 for (type--; type >= 0; type--) {
2489 if (flags & qtype_enforce_flag(type))
2490 dquot_enable(dqopt->files[type], type,
2491 dqopt->info[type].dqi_fmt_id,
2492 DQUOT_LIMITS_ENABLED);
2493 }
2494 return ret;
2495}
2496
Linus Torvalds1da177e2005-04-16 15:20:36 -07002497/* Generic routine for getting common part of quota structure */
Jan Kara14bf61f2014-10-09 16:03:13 +02002498static void do_get_dqblk(struct dquot *dquot, struct qc_dqblk *di)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002499{
2500 struct mem_dqblk *dm = &dquot->dq_dqb;
2501
Christoph Hellwigb9b2dd32010-05-06 17:04:58 -04002502 memset(di, 0, sizeof(*di));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002503 spin_lock(&dq_data_lock);
Jan Kara14bf61f2014-10-09 16:03:13 +02002504 di->d_spc_hardlimit = dm->dqb_bhardlimit;
2505 di->d_spc_softlimit = dm->dqb_bsoftlimit;
Christoph Hellwigb9b2dd32010-05-06 17:04:58 -04002506 di->d_ino_hardlimit = dm->dqb_ihardlimit;
2507 di->d_ino_softlimit = dm->dqb_isoftlimit;
Jan Kara14bf61f2014-10-09 16:03:13 +02002508 di->d_space = dm->dqb_curspace + dm->dqb_rsvspace;
2509 di->d_ino_count = dm->dqb_curinodes;
2510 di->d_spc_timer = dm->dqb_btime;
2511 di->d_ino_timer = dm->dqb_itime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002512 spin_unlock(&dq_data_lock);
2513}
2514
Eric W. Biederman74a8a102012-09-16 02:07:49 -07002515int dquot_get_dqblk(struct super_block *sb, struct kqid qid,
Jan Kara14bf61f2014-10-09 16:03:13 +02002516 struct qc_dqblk *di)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002517{
2518 struct dquot *dquot;
2519
Eric W. Biedermanaca645a2012-09-16 03:11:50 -07002520 dquot = dqget(sb, qid);
Jan Karadd6f3c62009-01-26 16:01:43 +01002521 if (!dquot)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002522 return -ESRCH;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002523 do_get_dqblk(dquot, di);
2524 dqput(dquot);
Jan Karacc334122009-01-12 17:23:05 +01002525
Linus Torvalds1da177e2005-04-16 15:20:36 -07002526 return 0;
2527}
Christoph Hellwig287a8092010-05-19 07:16:45 -04002528EXPORT_SYMBOL(dquot_get_dqblk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002529
Jan Kara14bf61f2014-10-09 16:03:13 +02002530#define VFS_QC_MASK \
2531 (QC_SPACE | QC_SPC_SOFT | QC_SPC_HARD | \
2532 QC_INO_COUNT | QC_INO_SOFT | QC_INO_HARD | \
2533 QC_SPC_TIMER | QC_INO_TIMER)
Christoph Hellwigc472b432010-05-06 17:05:17 -04002534
Linus Torvalds1da177e2005-04-16 15:20:36 -07002535/* Generic routine for setting common part of quota structure */
Jan Kara14bf61f2014-10-09 16:03:13 +02002536static int do_set_dqblk(struct dquot *dquot, struct qc_dqblk *di)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002537{
2538 struct mem_dqblk *dm = &dquot->dq_dqb;
2539 int check_blim = 0, check_ilim = 0;
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07002540 struct mem_dqinfo *dqi = &sb_dqopt(dquot->dq_sb)->info[dquot->dq_id.type];
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07002541
Jan Kara14bf61f2014-10-09 16:03:13 +02002542 if (di->d_fieldmask & ~VFS_QC_MASK)
Christoph Hellwigc472b432010-05-06 17:05:17 -04002543 return -EINVAL;
2544
Jan Kara14bf61f2014-10-09 16:03:13 +02002545 if (((di->d_fieldmask & QC_SPC_SOFT) &&
Jan Karab10a0812014-10-09 16:54:13 +02002546 di->d_spc_softlimit > dqi->dqi_max_spc_limit) ||
Jan Kara14bf61f2014-10-09 16:03:13 +02002547 ((di->d_fieldmask & QC_SPC_HARD) &&
Jan Karab10a0812014-10-09 16:54:13 +02002548 di->d_spc_hardlimit > dqi->dqi_max_spc_limit) ||
Jan Kara14bf61f2014-10-09 16:03:13 +02002549 ((di->d_fieldmask & QC_INO_SOFT) &&
Jan Karab10a0812014-10-09 16:54:13 +02002550 (di->d_ino_softlimit > dqi->dqi_max_ino_limit)) ||
Jan Kara14bf61f2014-10-09 16:03:13 +02002551 ((di->d_fieldmask & QC_INO_HARD) &&
Jan Karab10a0812014-10-09 16:54:13 +02002552 (di->d_ino_hardlimit > dqi->dqi_max_ino_limit)))
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07002553 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002554
2555 spin_lock(&dq_data_lock);
Jan Kara14bf61f2014-10-09 16:03:13 +02002556 if (di->d_fieldmask & QC_SPACE) {
2557 dm->dqb_curspace = di->d_space - dm->dqb_rsvspace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002558 check_blim = 1;
Andrew Perepechko08261672010-04-12 22:16:50 +04002559 set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002560 }
Christoph Hellwigc472b432010-05-06 17:05:17 -04002561
Jan Kara14bf61f2014-10-09 16:03:13 +02002562 if (di->d_fieldmask & QC_SPC_SOFT)
2563 dm->dqb_bsoftlimit = di->d_spc_softlimit;
2564 if (di->d_fieldmask & QC_SPC_HARD)
2565 dm->dqb_bhardlimit = di->d_spc_hardlimit;
2566 if (di->d_fieldmask & (QC_SPC_SOFT | QC_SPC_HARD)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002567 check_blim = 1;
Andrew Perepechko08261672010-04-12 22:16:50 +04002568 set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002569 }
Christoph Hellwigc472b432010-05-06 17:05:17 -04002570
Jan Kara14bf61f2014-10-09 16:03:13 +02002571 if (di->d_fieldmask & QC_INO_COUNT) {
2572 dm->dqb_curinodes = di->d_ino_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002573 check_ilim = 1;
Andrew Perepechko08261672010-04-12 22:16:50 +04002574 set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002575 }
Christoph Hellwigc472b432010-05-06 17:05:17 -04002576
Jan Kara14bf61f2014-10-09 16:03:13 +02002577 if (di->d_fieldmask & QC_INO_SOFT)
Christoph Hellwigc472b432010-05-06 17:05:17 -04002578 dm->dqb_isoftlimit = di->d_ino_softlimit;
Jan Kara14bf61f2014-10-09 16:03:13 +02002579 if (di->d_fieldmask & QC_INO_HARD)
Christoph Hellwigc472b432010-05-06 17:05:17 -04002580 dm->dqb_ihardlimit = di->d_ino_hardlimit;
Jan Kara14bf61f2014-10-09 16:03:13 +02002581 if (di->d_fieldmask & (QC_INO_SOFT | QC_INO_HARD)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002582 check_ilim = 1;
Andrew Perepechko08261672010-04-12 22:16:50 +04002583 set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002584 }
Christoph Hellwigc472b432010-05-06 17:05:17 -04002585
Jan Kara14bf61f2014-10-09 16:03:13 +02002586 if (di->d_fieldmask & QC_SPC_TIMER) {
2587 dm->dqb_btime = di->d_spc_timer;
Jan Karae04a88a92009-01-07 18:07:29 -08002588 check_blim = 1;
Andrew Perepechko08261672010-04-12 22:16:50 +04002589 set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
Jan Kara4d59bce2008-10-02 16:48:10 +02002590 }
Christoph Hellwigc472b432010-05-06 17:05:17 -04002591
Jan Kara14bf61f2014-10-09 16:03:13 +02002592 if (di->d_fieldmask & QC_INO_TIMER) {
2593 dm->dqb_itime = di->d_ino_timer;
Jan Karae04a88a92009-01-07 18:07:29 -08002594 check_ilim = 1;
Andrew Perepechko08261672010-04-12 22:16:50 +04002595 set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
Jan Kara4d59bce2008-10-02 16:48:10 +02002596 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002597
2598 if (check_blim) {
Jan Kara268157b2009-01-27 15:47:22 +01002599 if (!dm->dqb_bsoftlimit ||
2600 dm->dqb_curspace < dm->dqb_bsoftlimit) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002601 dm->dqb_btime = 0;
2602 clear_bit(DQ_BLKS_B, &dquot->dq_flags);
Jan Kara14bf61f2014-10-09 16:03:13 +02002603 } else if (!(di->d_fieldmask & QC_SPC_TIMER))
Jan Kara268157b2009-01-27 15:47:22 +01002604 /* Set grace only if user hasn't provided his own... */
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07002605 dm->dqb_btime = get_seconds() + dqi->dqi_bgrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002606 }
2607 if (check_ilim) {
Jan Kara268157b2009-01-27 15:47:22 +01002608 if (!dm->dqb_isoftlimit ||
2609 dm->dqb_curinodes < dm->dqb_isoftlimit) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002610 dm->dqb_itime = 0;
2611 clear_bit(DQ_INODES_B, &dquot->dq_flags);
Jan Kara14bf61f2014-10-09 16:03:13 +02002612 } else if (!(di->d_fieldmask & QC_INO_TIMER))
Jan Kara268157b2009-01-27 15:47:22 +01002613 /* Set grace only if user hasn't provided his own... */
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07002614 dm->dqb_itime = get_seconds() + dqi->dqi_igrace;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002615 }
Jan Kara268157b2009-01-27 15:47:22 +01002616 if (dm->dqb_bhardlimit || dm->dqb_bsoftlimit || dm->dqb_ihardlimit ||
2617 dm->dqb_isoftlimit)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002618 clear_bit(DQ_FAKE_B, &dquot->dq_flags);
2619 else
2620 set_bit(DQ_FAKE_B, &dquot->dq_flags);
2621 spin_unlock(&dq_data_lock);
2622 mark_dquot_dirty(dquot);
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07002623
2624 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002625}
2626
Eric W. Biederman74a8a102012-09-16 02:07:49 -07002627int dquot_set_dqblk(struct super_block *sb, struct kqid qid,
Jan Kara14bf61f2014-10-09 16:03:13 +02002628 struct qc_dqblk *di)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002629{
2630 struct dquot *dquot;
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07002631 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002632
Eric W. Biedermanaca645a2012-09-16 03:11:50 -07002633 dquot = dqget(sb, qid);
Jan Karaf55abc02008-08-20 17:50:32 +02002634 if (!dquot) {
2635 rc = -ESRCH;
2636 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002637 }
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07002638 rc = do_set_dqblk(dquot, di);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002639 dqput(dquot);
Jan Karaf55abc02008-08-20 17:50:32 +02002640out:
Andrew Perepechko338bf9a2008-04-28 02:14:31 -07002641 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002642}
Christoph Hellwig287a8092010-05-19 07:16:45 -04002643EXPORT_SYMBOL(dquot_set_dqblk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002644
2645/* Generic routine for getting common part of quota file information */
Jan Kara0a2403392014-11-19 00:42:09 +01002646int dquot_get_state(struct super_block *sb, struct qc_state *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002647{
2648 struct mem_dqinfo *mi;
Jan Kara0a2403392014-11-19 00:42:09 +01002649 struct qc_type_state *tstate;
2650 struct quota_info *dqopt = sb_dqopt(sb);
2651 int type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002652
Ingo Molnard3be9152006-03-23 03:00:29 -08002653 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
Jan Kara0a2403392014-11-19 00:42:09 +01002654 memset(state, 0, sizeof(*state));
2655 for (type = 0; type < MAXQUOTAS; type++) {
2656 if (!sb_has_quota_active(sb, type))
2657 continue;
2658 tstate = state->s_state + type;
2659 mi = sb_dqopt(sb)->info + type;
2660 tstate->flags = QCI_ACCT_ENABLED;
2661 spin_lock(&dq_data_lock);
2662 if (mi->dqi_flags & DQF_SYS_FILE)
2663 tstate->flags |= QCI_SYSFILE;
2664 if (mi->dqi_flags & DQF_ROOT_SQUASH)
2665 tstate->flags |= QCI_ROOT_SQUASH;
2666 if (sb_has_quota_limits_enabled(sb, type))
2667 tstate->flags |= QCI_LIMITS_ENFORCED;
2668 tstate->spc_timelimit = mi->dqi_bgrace;
2669 tstate->ino_timelimit = mi->dqi_igrace;
2670 tstate->ino = dqopt->files[type]->i_ino;
2671 tstate->blocks = dqopt->files[type]->i_blocks;
2672 tstate->nextents = 1; /* We don't know... */
2673 spin_unlock(&dq_data_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002674 }
Ingo Molnard3be9152006-03-23 03:00:29 -08002675 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002676 return 0;
2677}
Jan Kara0a2403392014-11-19 00:42:09 +01002678EXPORT_SYMBOL(dquot_get_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002679
2680/* Generic routine for setting common part of quota file information */
Jan Kara5eacb2a2014-12-16 12:03:51 +01002681int dquot_set_dqinfo(struct super_block *sb, int type, struct qc_info *ii)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002682{
2683 struct mem_dqinfo *mi;
Jan Karaf55abc02008-08-20 17:50:32 +02002684 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002685
Jan Kara5eacb2a2014-12-16 12:03:51 +01002686 if ((ii->i_fieldmask & QC_WARNS_MASK) ||
2687 (ii->i_fieldmask & QC_RT_SPC_TIMER))
2688 return -EINVAL;
Ingo Molnard3be9152006-03-23 03:00:29 -08002689 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
Jan Karaf55abc02008-08-20 17:50:32 +02002690 if (!sb_has_quota_active(sb, type)) {
2691 err = -ESRCH;
2692 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002693 }
2694 mi = sb_dqopt(sb)->info + type;
Jan Kara5eacb2a2014-12-16 12:03:51 +01002695 if (ii->i_fieldmask & QC_FLAGS) {
2696 if ((ii->i_flags & QCI_ROOT_SQUASH &&
Jan Karaca6cb0912014-11-19 09:32:39 +01002697 mi->dqi_format->qf_fmt_id != QFMT_VFS_OLD)) {
2698 err = -EINVAL;
2699 goto out;
2700 }
2701 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002702 spin_lock(&dq_data_lock);
Jan Kara5eacb2a2014-12-16 12:03:51 +01002703 if (ii->i_fieldmask & QC_SPC_TIMER)
2704 mi->dqi_bgrace = ii->i_spc_timelimit;
2705 if (ii->i_fieldmask & QC_INO_TIMER)
2706 mi->dqi_igrace = ii->i_ino_timelimit;
2707 if (ii->i_fieldmask & QC_FLAGS) {
2708 if (ii->i_flags & QCI_ROOT_SQUASH)
2709 mi->dqi_flags |= DQF_ROOT_SQUASH;
2710 else
2711 mi->dqi_flags &= ~DQF_ROOT_SQUASH;
2712 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002713 spin_unlock(&dq_data_lock);
2714 mark_info_dirty(sb, type);
2715 /* Force write to disk */
2716 sb->dq_op->write_info(sb, type);
Jan Karaf55abc02008-08-20 17:50:32 +02002717out:
Ingo Molnard3be9152006-03-23 03:00:29 -08002718 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
Jan Karaf55abc02008-08-20 17:50:32 +02002719 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002720}
Christoph Hellwig287a8092010-05-19 07:16:45 -04002721EXPORT_SYMBOL(dquot_set_dqinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002722
Christoph Hellwig287a8092010-05-19 07:16:45 -04002723const struct quotactl_ops dquot_quotactl_ops = {
2724 .quota_on = dquot_quota_on,
2725 .quota_off = dquot_quota_off,
2726 .quota_sync = dquot_quota_sync,
Jan Kara0a2403392014-11-19 00:42:09 +01002727 .get_state = dquot_get_state,
Christoph Hellwig287a8092010-05-19 07:16:45 -04002728 .set_info = dquot_set_dqinfo,
2729 .get_dqblk = dquot_get_dqblk,
2730 .set_dqblk = dquot_set_dqblk
Linus Torvalds1da177e2005-04-16 15:20:36 -07002731};
Christoph Hellwig287a8092010-05-19 07:16:45 -04002732EXPORT_SYMBOL(dquot_quotactl_ops);
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002733
Jan Kara3e2af672014-10-06 18:40:51 +02002734const struct quotactl_ops dquot_quotactl_sysfile_ops = {
2735 .quota_enable = dquot_quota_enable,
2736 .quota_disable = dquot_quota_disable,
2737 .quota_sync = dquot_quota_sync,
Jan Kara0a2403392014-11-19 00:42:09 +01002738 .get_state = dquot_get_state,
Jan Kara3e2af672014-10-06 18:40:51 +02002739 .set_info = dquot_set_dqinfo,
2740 .get_dqblk = dquot_get_dqblk,
2741 .set_dqblk = dquot_set_dqblk
2742};
2743EXPORT_SYMBOL(dquot_quotactl_sysfile_ops);
2744
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002745static int do_proc_dqstats(struct ctl_table *table, int write,
2746 void __user *buffer, size_t *lenp, loff_t *ppos)
2747{
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002748 unsigned int type = (int *)table->data - dqstats.stat;
Dmitry Monakhovf32764b2010-05-26 23:21:58 +02002749
2750 /* Update global table */
2751 dqstats.stat[type] =
2752 percpu_counter_sum_positive(&dqstats.counter[type]);
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002753 return proc_dointvec(table, write, buffer, lenp, ppos);
2754}
2755
Joe Perchese6287532013-06-13 19:37:49 -07002756static struct ctl_table fs_dqstats_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002757 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002758 .procname = "lookups",
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002759 .data = &dqstats.stat[DQST_LOOKUPS],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002760 .maxlen = sizeof(int),
2761 .mode = 0444,
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002762 .proc_handler = do_proc_dqstats,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002763 },
2764 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002765 .procname = "drops",
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002766 .data = &dqstats.stat[DQST_DROPS],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002767 .maxlen = sizeof(int),
2768 .mode = 0444,
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002769 .proc_handler = do_proc_dqstats,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002770 },
2771 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002772 .procname = "reads",
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002773 .data = &dqstats.stat[DQST_READS],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002774 .maxlen = sizeof(int),
2775 .mode = 0444,
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002776 .proc_handler = do_proc_dqstats,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002777 },
2778 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002779 .procname = "writes",
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002780 .data = &dqstats.stat[DQST_WRITES],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002781 .maxlen = sizeof(int),
2782 .mode = 0444,
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002783 .proc_handler = do_proc_dqstats,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002784 },
2785 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002786 .procname = "cache_hits",
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002787 .data = &dqstats.stat[DQST_CACHE_HITS],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002788 .maxlen = sizeof(int),
2789 .mode = 0444,
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002790 .proc_handler = do_proc_dqstats,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002791 },
2792 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002793 .procname = "allocated_dquots",
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002794 .data = &dqstats.stat[DQST_ALLOC_DQUOTS],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002795 .maxlen = sizeof(int),
2796 .mode = 0444,
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002797 .proc_handler = do_proc_dqstats,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002798 },
2799 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002800 .procname = "free_dquots",
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002801 .data = &dqstats.stat[DQST_FREE_DQUOTS],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002802 .maxlen = sizeof(int),
2803 .mode = 0444,
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002804 .proc_handler = do_proc_dqstats,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002805 },
2806 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002807 .procname = "syncs",
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002808 .data = &dqstats.stat[DQST_SYNCS],
Linus Torvalds1da177e2005-04-16 15:20:36 -07002809 .maxlen = sizeof(int),
2810 .mode = 0444,
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002811 .proc_handler = do_proc_dqstats,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002812 },
Jan Kara8e893462007-10-16 23:29:31 -07002813#ifdef CONFIG_PRINT_QUOTA_WARNING
Linus Torvalds1da177e2005-04-16 15:20:36 -07002814 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002815 .procname = "warnings",
2816 .data = &flag_print_warnings,
2817 .maxlen = sizeof(int),
2818 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08002819 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002820 },
Jan Kara8e893462007-10-16 23:29:31 -07002821#endif
Eric W. Biedermanab092032009-11-05 14:25:10 -08002822 { },
Linus Torvalds1da177e2005-04-16 15:20:36 -07002823};
2824
Joe Perchese6287532013-06-13 19:37:49 -07002825static struct ctl_table fs_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002826 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002827 .procname = "quota",
2828 .mode = 0555,
2829 .child = fs_dqstats_table,
2830 },
Eric W. Biedermanab092032009-11-05 14:25:10 -08002831 { },
Linus Torvalds1da177e2005-04-16 15:20:36 -07002832};
2833
Joe Perchese6287532013-06-13 19:37:49 -07002834static struct ctl_table sys_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002835 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002836 .procname = "fs",
2837 .mode = 0555,
2838 .child = fs_table,
2839 },
Eric W. Biedermanab092032009-11-05 14:25:10 -08002840 { },
Linus Torvalds1da177e2005-04-16 15:20:36 -07002841};
2842
2843static int __init dquot_init(void)
2844{
Dmitry Monakhovf32764b2010-05-26 23:21:58 +02002845 int i, ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002846 unsigned long nr_hash, order;
2847
2848 printk(KERN_NOTICE "VFS: Disk quotas %s\n", __DQUOT_VERSION__);
2849
Eric W. Biederman0b4d4142007-02-14 00:34:09 -08002850 register_sysctl_table(sys_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002851
Paul Mundt20c2df82007-07-20 10:11:58 +09002852 dquot_cachep = kmem_cache_create("dquot",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002853 sizeof(struct dquot), sizeof(unsigned long) * 4,
Paul Jacksonfffb60f2006-03-24 03:16:06 -08002854 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
2855 SLAB_MEM_SPREAD|SLAB_PANIC),
Paul Mundt20c2df82007-07-20 10:11:58 +09002856 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002857
2858 order = 0;
2859 dquot_hash = (struct hlist_head *)__get_free_pages(GFP_ATOMIC, order);
2860 if (!dquot_hash)
2861 panic("Cannot create dquot hash table");
2862
Dmitry Monakhovf32764b2010-05-26 23:21:58 +02002863 for (i = 0; i < _DQST_DQSTAT_LAST; i++) {
Tejun Heo908c7f12014-09-08 09:51:29 +09002864 ret = percpu_counter_init(&dqstats.counter[i], 0, GFP_KERNEL);
Dmitry Monakhovf32764b2010-05-26 23:21:58 +02002865 if (ret)
2866 panic("Cannot create dquot stat counters");
2867 }
Dmitry Monakhovdde95882010-04-26 20:03:33 +04002868
Linus Torvalds1da177e2005-04-16 15:20:36 -07002869 /* Find power-of-two hlist_heads which can fit into allocation */
2870 nr_hash = (1UL << order) * PAGE_SIZE / sizeof(struct hlist_head);
2871 dq_hash_bits = 0;
2872 do {
2873 dq_hash_bits++;
2874 } while (nr_hash >> dq_hash_bits);
2875 dq_hash_bits--;
2876
2877 nr_hash = 1UL << dq_hash_bits;
2878 dq_hash_mask = nr_hash - 1;
2879 for (i = 0; i < nr_hash; i++)
2880 INIT_HLIST_HEAD(dquot_hash + i);
2881
Anton Blanchard19858e72014-11-04 12:05:01 +11002882 pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld,"
2883 " %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002884
Rusty Russell8e1f9362007-07-17 04:03:17 -07002885 register_shrinker(&dqcache_shrinker);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002886
Linus Torvalds1da177e2005-04-16 15:20:36 -07002887 return 0;
2888}
2889module_init(dquot_init);