blob: cb785569903759e054141b09e62e4a2c0442425f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (c) 1982, 1986 Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Robert Elz at The University of Melbourne.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 */
32
33#ifndef _LINUX_QUOTA_
34#define _LINUX_QUOTA_
35
36#include <linux/errno.h>
37#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Jan Kara571b46e2008-10-30 09:17:52 +010039#define __DQUOT_VERSION__ "dquot_6.5.2"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#define MAXQUOTAS 2
42#define USRQUOTA 0 /* element used for user quotas */
43#define GRPQUOTA 1 /* element used for group quotas */
44
45/*
46 * Definitions for the default names of the quotas files.
47 */
48#define INITQFNAMES { \
49 "user", /* USRQUOTA */ \
50 "group", /* GRPQUOTA */ \
51 "undefined", \
52};
53
54/*
55 * Command definitions for the 'quotactl' system call.
56 * The commands are broken into a main command defined below
57 * and a subcommand that is used to convey the type of
58 * quota that is being manipulated (see above).
59 */
60#define SUBCMDMASK 0x00ff
61#define SUBCMDSHIFT 8
62#define QCMD(cmd, type) (((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK))
63
64#define Q_SYNC 0x800001 /* sync disk copy of a filesystems quotas */
65#define Q_QUOTAON 0x800002 /* turn quotas on */
66#define Q_QUOTAOFF 0x800003 /* turn quotas off */
67#define Q_GETFMT 0x800004 /* get quota format used on given filesystem */
68#define Q_GETINFO 0x800005 /* get information about quota files */
69#define Q_SETINFO 0x800006 /* set information about quota files */
70#define Q_GETQUOTA 0x800007 /* get user quota structure */
71#define Q_SETQUOTA 0x800008 /* set user quota structure */
72
Jan Kara5cd9d5b2008-11-25 15:31:31 +010073/* Quota format type IDs */
74#define QFMT_VFS_OLD 1
75#define QFMT_VFS_V0 2
Jan Kara30673932009-11-30 22:17:41 +010076#define QFMT_OCFS2 3
Jan Kara498c6012009-11-16 18:09:47 +010077#define QFMT_VFS_V1 4
Jan Kara5cd9d5b2008-11-25 15:31:31 +010078
Jan Kara12095462008-08-20 14:45:12 +020079/* Size of block in which space limits are passed through the quota
80 * interface */
81#define QIF_DQBLKSIZE_BITS 10
82#define QIF_DQBLKSIZE (1 << QIF_DQBLKSIZE_BITS)
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084/*
85 * Quota structure used for communication with userspace via quotactl
86 * Following flags are used to specify which fields are valid
87 */
Jan Kara4d59bce2008-10-02 16:48:10 +020088enum {
89 QIF_BLIMITS_B = 0,
90 QIF_SPACE_B,
91 QIF_ILIMITS_B,
92 QIF_INODES_B,
93 QIF_BTIME_B,
94 QIF_ITIME_B,
95};
96
97#define QIF_BLIMITS (1 << QIF_BLIMITS_B)
98#define QIF_SPACE (1 << QIF_SPACE_B)
99#define QIF_ILIMITS (1 << QIF_ILIMITS_B)
100#define QIF_INODES (1 << QIF_INODES_B)
101#define QIF_BTIME (1 << QIF_BTIME_B)
102#define QIF_ITIME (1 << QIF_ITIME_B)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103#define QIF_LIMITS (QIF_BLIMITS | QIF_ILIMITS)
104#define QIF_USAGE (QIF_SPACE | QIF_INODES)
105#define QIF_TIMES (QIF_BTIME | QIF_ITIME)
106#define QIF_ALL (QIF_LIMITS | QIF_USAGE | QIF_TIMES)
107
108struct if_dqblk {
109 __u64 dqb_bhardlimit;
110 __u64 dqb_bsoftlimit;
111 __u64 dqb_curspace;
112 __u64 dqb_ihardlimit;
113 __u64 dqb_isoftlimit;
114 __u64 dqb_curinodes;
115 __u64 dqb_btime;
116 __u64 dqb_itime;
117 __u32 dqb_valid;
118};
119
120/*
121 * Structure used for setting quota information about file via quotactl
122 * Following flags are used to specify which fields are valid
123 */
124#define IIF_BGRACE 1
125#define IIF_IGRACE 2
126#define IIF_FLAGS 4
127#define IIF_ALL (IIF_BGRACE | IIF_IGRACE | IIF_FLAGS)
128
129struct if_dqinfo {
130 __u64 dqi_bgrace;
131 __u64 dqi_igrace;
132 __u32 dqi_flags;
133 __u32 dqi_valid;
134};
135
Jan Kara8e893462007-10-16 23:29:31 -0700136/*
137 * Definitions for quota netlink interface
138 */
139#define QUOTA_NL_NOWARN 0
140#define QUOTA_NL_IHARDWARN 1 /* Inode hardlimit reached */
141#define QUOTA_NL_ISOFTLONGWARN 2 /* Inode grace time expired */
142#define QUOTA_NL_ISOFTWARN 3 /* Inode softlimit reached */
143#define QUOTA_NL_BHARDWARN 4 /* Block hardlimit reached */
144#define QUOTA_NL_BSOFTLONGWARN 5 /* Block grace time expired */
145#define QUOTA_NL_BSOFTWARN 6 /* Block softlimit reached */
Jan Kara657d3bf2008-07-25 01:46:52 -0700146#define QUOTA_NL_IHARDBELOW 7 /* Usage got below inode hardlimit */
147#define QUOTA_NL_ISOFTBELOW 8 /* Usage got below inode softlimit */
148#define QUOTA_NL_BHARDBELOW 9 /* Usage got below block hardlimit */
149#define QUOTA_NL_BSOFTBELOW 10 /* Usage got below block softlimit */
Jan Kara8e893462007-10-16 23:29:31 -0700150
151enum {
152 QUOTA_NL_C_UNSPEC,
153 QUOTA_NL_C_WARNING,
154 __QUOTA_NL_C_MAX,
155};
156#define QUOTA_NL_C_MAX (__QUOTA_NL_C_MAX - 1)
157
158enum {
159 QUOTA_NL_A_UNSPEC,
160 QUOTA_NL_A_QTYPE,
161 QUOTA_NL_A_EXCESS_ID,
162 QUOTA_NL_A_WARNING,
163 QUOTA_NL_A_DEV_MAJOR,
164 QUOTA_NL_A_DEV_MINOR,
165 QUOTA_NL_A_CAUSED_ID,
166 __QUOTA_NL_A_MAX,
167};
168#define QUOTA_NL_A_MAX (__QUOTA_NL_A_MAX - 1)
169
170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171#ifdef __KERNEL__
Matthew Wilcox8b91de22008-02-26 09:53:20 -0500172#include <linux/list.h>
David Woodhouse0409d3a2006-04-25 14:52:13 +0100173#include <linux/mutex.h>
Matthew Wilcox8b91de22008-02-26 09:53:20 -0500174#include <linux/rwsem.h>
175#include <linux/spinlock.h>
176#include <linux/wait.h>
Dmitry Monakhovf32764b2010-05-26 23:21:58 +0200177#include <linux/percpu_counter.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
179#include <linux/dqblk_xfs.h>
180#include <linux/dqblk_v1.h>
181#include <linux/dqblk_v2.h>
182
Arun Sharma600634972011-07-26 16:09:06 -0700183#include <linux/atomic.h>
Matthew Wilcox8b91de22008-02-26 09:53:20 -0500184
Jan Kara74abb982008-07-25 01:46:51 -0700185typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
Jan Karadb49d2d2008-10-01 18:21:39 +0200186typedef long long qsize_t; /* Type in which we store sizes */
Jan Kara74abb982008-07-25 01:46:51 -0700187
Mike Frysingeracd64b72007-05-08 00:31:51 -0700188extern spinlock_t dq_data_lock;
189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190/* Maximal numbers of writes for quota operation (insert/delete/update)
Jan Kara4e5117b2005-06-23 22:01:03 -0700191 * (over VFS all formats) */
192#define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC)
193#define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE)
194#define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC)
195#define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
197/*
198 * Data for one user/group kept in memory
199 */
200struct mem_dqblk {
Jan Kara12095462008-08-20 14:45:12 +0200201 qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */
202 qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 qsize_t dqb_curspace; /* current used space */
Mingming Caof18df222009-01-13 16:43:09 +0100204 qsize_t dqb_rsvspace; /* current reserved space for delalloc*/
Jan Kara12095462008-08-20 14:45:12 +0200205 qsize_t dqb_ihardlimit; /* absolute limit on allocated inodes */
206 qsize_t dqb_isoftlimit; /* preferred inode limit */
207 qsize_t dqb_curinodes; /* current # allocated inodes */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 time_t dqb_btime; /* time limit for excessive disk use */
209 time_t dqb_itime; /* time limit for excessive inode use */
210};
211
212/*
213 * Data for one quotafile kept in memory
214 */
215struct quota_format_type;
216
217struct mem_dqinfo {
218 struct quota_format_type *dqi_format;
Jan Kara0ff5af82008-04-28 02:14:33 -0700219 int dqi_fmt_id; /* Id of the dqi_format - used when turning
220 * quotas on after remount RW */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 struct list_head dqi_dirty_list; /* List of dirty dquots */
222 unsigned long dqi_flags;
223 unsigned int dqi_bgrace;
224 unsigned int dqi_igrace;
Andrew Perepechko338bf9a2008-04-28 02:14:31 -0700225 qsize_t dqi_maxblimit;
226 qsize_t dqi_maxilimit;
Jan Karae3d4d562008-10-02 18:44:14 +0200227 void *dqi_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228};
229
230struct super_block;
231
232#define DQF_MASK 0xffff /* Mask for format specific flags */
233#define DQF_INFO_DIRTY_B 16
234#define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B) /* Is info dirty? */
235
236extern void mark_info_dirty(struct super_block *sb, int type);
Jan Kara03b06342008-07-25 01:46:52 -0700237static inline int info_dirty(struct mem_dqinfo *info)
238{
239 return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);
240}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400242enum {
243 DQST_LOOKUPS,
244 DQST_DROPS,
245 DQST_READS,
246 DQST_WRITES,
247 DQST_CACHE_HITS,
248 DQST_ALLOC_DQUOTS,
249 DQST_FREE_DQUOTS,
250 DQST_SYNCS,
251 _DQST_DQSTAT_LAST
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252};
253
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400254struct dqstats {
255 int stat[_DQST_DQSTAT_LAST];
Dmitry Monakhovf32764b2010-05-26 23:21:58 +0200256 struct percpu_counter counter[_DQST_DQSTAT_LAST];
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400257};
258
259extern struct dqstats *dqstats_pcpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260extern struct dqstats dqstats;
261
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400262static inline void dqstats_inc(unsigned int type)
263{
Dmitry Monakhovf32764b2010-05-26 23:21:58 +0200264 percpu_counter_inc(&dqstats.counter[type]);
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400265}
266
267static inline void dqstats_dec(unsigned int type)
268{
Dmitry Monakhovf32764b2010-05-26 23:21:58 +0200269 percpu_counter_dec(&dqstats.counter[type]);
Dmitry Monakhovdde95882010-04-26 20:03:33 +0400270}
271
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272#define DQ_MOD_B 0 /* dquot modified since read */
273#define DQ_BLKS_B 1 /* uid/gid has been warned about blk limit */
274#define DQ_INODES_B 2 /* uid/gid has been warned about inode limit */
275#define DQ_FAKE_B 3 /* no limits only usage */
276#define DQ_READ_B 4 /* dquot was read into memory */
277#define DQ_ACTIVE_B 5 /* dquot is active (dquot_release not called) */
Jan Kara4d59bce2008-10-02 16:48:10 +0200278#define DQ_LASTSET_B 6 /* Following 6 bits (see QIF_) are reserved\
279 * for the mask of entries set via SETQUOTA\
280 * quotactl. They are set under dq_data_lock\
281 * and the quota format handling dquot can\
282 * clear them when it sees fit. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
284struct dquot {
285 struct hlist_node dq_hash; /* Hash list in memory */
286 struct list_head dq_inuse; /* List of all quotas */
287 struct list_head dq_free; /* Free list element */
288 struct list_head dq_dirty; /* List of dirty dquots */
Ingo Molnard3be9152006-03-23 03:00:29 -0800289 struct mutex dq_lock; /* dquot IO lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 atomic_t dq_count; /* Use count */
291 wait_queue_head_t dq_wait_unused; /* Wait queue for dquot to become unused */
292 struct super_block *dq_sb; /* superblock this applies to */
293 unsigned int dq_id; /* ID this applies to (uid, gid) */
294 loff_t dq_off; /* Offset of dquot on disk */
295 unsigned long dq_flags; /* See DQ_* */
296 short dq_type; /* Type of quota */
297 struct mem_dqblk dq_dqb; /* Diskquota usage */
298};
299
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300/* Operations which must be implemented by each quota format */
301struct quota_format_ops {
302 int (*check_quota_file)(struct super_block *sb, int type); /* Detect whether file is in our format */
303 int (*read_file_info)(struct super_block *sb, int type); /* Read main info about file - called on quotaon() */
304 int (*write_file_info)(struct super_block *sb, int type); /* Write main info about file */
305 int (*free_file_info)(struct super_block *sb, int type); /* Called on quotaoff() */
306 int (*read_dqblk)(struct dquot *dquot); /* Read structure for one user */
307 int (*commit_dqblk)(struct dquot *dquot); /* Write structure for one user */
308 int (*release_dqblk)(struct dquot *dquot); /* Called when last reference to dquot is being dropped */
309};
310
311/* Operations working with dquots */
312struct dquot_operations {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 int (*write_dquot) (struct dquot *); /* Ordinary dquot write */
Jan Kara74f783a2008-08-19 14:51:22 +0200314 struct dquot *(*alloc_dquot)(struct super_block *, int); /* Allocate memory for new dquot */
315 void (*destroy_dquot)(struct dquot *); /* Free memory for dquot */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 int (*acquire_dquot) (struct dquot *); /* Quota is going to be created on disk */
317 int (*release_dquot) (struct dquot *); /* Quota is going to be deleted from disk */
318 int (*mark_dirty) (struct dquot *); /* Dquot is marked dirty */
319 int (*write_info) (struct super_block *, int); /* Write of quota "superblock" */
Dmitry Monakhovfd8fbfc2009-12-14 15:21:13 +0300320 /* get reserved quota for delayed alloc, value returned is managed by
321 * quota code only */
322 qsize_t *(*get_reserved_space) (struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323};
324
Jan Karaf00c9e42010-09-15 17:38:58 +0200325struct path;
326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327/* Operations handling requests from userspace */
328struct quotactl_ops {
Jan Karaf00c9e42010-09-15 17:38:58 +0200329 int (*quota_on)(struct super_block *, int, int, struct path *);
330 int (*quota_on_meta)(struct super_block *, int, int);
Christoph Hellwig307ae182010-05-19 07:16:43 -0400331 int (*quota_off)(struct super_block *, int);
Christoph Hellwig5fb324a2010-02-16 03:44:52 -0500332 int (*quota_sync)(struct super_block *, int, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 int (*get_info)(struct super_block *, int, struct if_dqinfo *);
334 int (*set_info)(struct super_block *, int, struct if_dqinfo *);
Christoph Hellwigb9b2dd32010-05-06 17:04:58 -0400335 int (*get_dqblk)(struct super_block *, int, qid_t, struct fs_disk_quota *);
Christoph Hellwigc472b432010-05-06 17:05:17 -0400336 int (*set_dqblk)(struct super_block *, int, qid_t, struct fs_disk_quota *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 int (*get_xstate)(struct super_block *, struct fs_quota_stat *);
338 int (*set_xstate)(struct super_block *, unsigned int, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339};
340
341struct quota_format_type {
342 int qf_fmt_id; /* Quota format id */
Alexey Dobriyan1472da52009-10-16 15:26:03 +0400343 const struct quota_format_ops *qf_ops; /* Operations of format */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 struct module *qf_owner; /* Module implementing quota format */
345 struct quota_format_type *qf_next;
346};
347
Jan Karaf55abc02008-08-20 17:50:32 +0200348/* Quota state flags - they actually come in two flavors - for users and groups */
349enum {
350 _DQUOT_USAGE_ENABLED = 0, /* Track disk usage for users */
351 _DQUOT_LIMITS_ENABLED, /* Enforce quota limits for users */
352 _DQUOT_SUSPENDED, /* User diskquotas are off, but
Jan Kara0ff5af82008-04-28 02:14:33 -0700353 * we have necessary info in
354 * memory to turn them on */
Jan Karaf55abc02008-08-20 17:50:32 +0200355 _DQUOT_STATE_FLAGS
356};
357#define DQUOT_USAGE_ENABLED (1 << _DQUOT_USAGE_ENABLED)
358#define DQUOT_LIMITS_ENABLED (1 << _DQUOT_LIMITS_ENABLED)
359#define DQUOT_SUSPENDED (1 << _DQUOT_SUSPENDED)
360#define DQUOT_STATE_FLAGS (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \
361 DQUOT_SUSPENDED)
Jan Karaca785ec2008-09-30 17:53:37 +0200362/* Other quota flags */
Dmitry Monakhovad1e6e82010-02-16 08:31:49 +0300363#define DQUOT_STATE_LAST (_DQUOT_STATE_FLAGS * MAXQUOTAS)
364#define DQUOT_QUOTA_SYS_FILE (1 << DQUOT_STATE_LAST)
365 /* Quota file is a special
Jan Karaca785ec2008-09-30 17:53:37 +0200366 * system file and user cannot
367 * touch it. Filesystem is
368 * responsible for setting
369 * S_NOQUOTA, S_NOATIME flags
370 */
Dmitry Monakhovad1e6e82010-02-16 08:31:49 +0300371#define DQUOT_NEGATIVE_USAGE (1 << (DQUOT_STATE_LAST + 1))
372 /* Allow negative quota usage */
Jan Karaf55abc02008-08-20 17:50:32 +0200373
374static inline unsigned int dquot_state_flag(unsigned int flags, int type)
375{
Dmitry Monakhovad1e6e82010-02-16 08:31:49 +0300376 return flags << _DQUOT_STATE_FLAGS * type;
Jan Karaf55abc02008-08-20 17:50:32 +0200377}
378
379static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
380{
Dmitry Monakhovad1e6e82010-02-16 08:31:49 +0300381 return (flags >> _DQUOT_STATE_FLAGS * type) & DQUOT_STATE_FLAGS;
Jan Karaf55abc02008-08-20 17:50:32 +0200382}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
Steven Whitehouse86e931a2009-09-28 12:35:17 +0100384#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
385extern void quota_send_warning(short type, unsigned int id, dev_t dev,
386 const char warntype);
387#else
388static inline void quota_send_warning(short type, unsigned int id, dev_t dev,
389 const char warntype)
390{
391 return;
392}
393#endif /* CONFIG_QUOTA_NETLINK_INTERFACE */
394
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395struct quota_info {
396 unsigned int flags; /* Flags for diskquotas on this device */
Ingo Molnard3be9152006-03-23 03:00:29 -0800397 struct mutex dqio_mutex; /* lock device while I/O in progress */
398 struct mutex dqonoff_mutex; /* Serialize quotaon & quotaoff */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 struct rw_semaphore dqptr_sem; /* serialize ops using quota_info struct, pointers from inode to dquots */
400 struct inode *files[MAXQUOTAS]; /* inodes of quotafiles */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 struct mem_dqinfo info[MAXQUOTAS]; /* Information for each quota type */
Alexey Dobriyan1472da52009-10-16 15:26:03 +0400402 const struct quota_format_ops *ops[MAXQUOTAS]; /* Operations for each type */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403};
404
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405int register_quota_format(struct quota_format_type *fmt);
406void unregister_quota_format(struct quota_format_type *fmt);
407
408struct quota_module_name {
409 int qm_fmt_id;
410 char *qm_mod_name;
411};
412
413#define INIT_QUOTA_MODULE_NAMES {\
414 {QFMT_VFS_OLD, "quota_v1"},\
415 {QFMT_VFS_V0, "quota_v2"},\
416 {0, NULL}}
417
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418#endif /* __KERNEL__ */
419#endif /* _QUOTA_ */