[people/ms/linux.git] / include / linux / quota.h

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Robert Elz at The University of Melbourne.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef _LINUX_QUOTA_
#define _LINUX_QUOTA_

#include <linux/errno.h>
#include <linux/types.h>

#define __DQUOT_VERSION__	"dquot_6.5.1"
#define __DQUOT_NUM_VERSION__	6*10000+5*100+1

#define MAXQUOTAS 2
#define USRQUOTA  0		/* element used for user quotas */
#define GRPQUOTA  1		/* element used for group quotas */

/*
 * Definitions for the default names of the quotas files.
 */
#define INITQFNAMES { \
	"user",    /* USRQUOTA */ \
	"group",   /* GRPQUOTA */ \
	"undefined", \
};

/*
 * Command definitions for the 'quotactl' system call.
 * The commands are broken into a main command defined below
 * and a subcommand that is used to convey the type of
 * quota that is being manipulated (see above).
 */
#define SUBCMDMASK  0x00ff
#define SUBCMDSHIFT 8
#define QCMD(cmd, type)  (((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK))

#define Q_SYNC     0x800001	/* sync disk copy of a filesystems quotas */
#define Q_QUOTAON  0x800002	/* turn quotas on */
#define Q_QUOTAOFF 0x800003	/* turn quotas off */
#define Q_GETFMT   0x800004	/* get quota format used on given filesystem */
#define Q_GETINFO  0x800005	/* get information about quota files */
#define Q_SETINFO  0x800006	/* set information about quota files */
#define Q_GETQUOTA 0x800007	/* get user quota structure */
#define Q_SETQUOTA 0x800008	/* set user quota structure */

/* Size of block in which space limits are passed through the quota
 * interface */
#define QIF_DQBLKSIZE_BITS 10
#define QIF_DQBLKSIZE (1 << QIF_DQBLKSIZE_BITS)

/*
 * Quota structure used for communication with userspace via quotactl
 * Following flags are used to specify which fields are valid
 */
#define QIF_BLIMITS	1
#define QIF_SPACE	2
#define QIF_ILIMITS	4
#define QIF_INODES	8
#define QIF_BTIME	16
#define QIF_ITIME	32
#define QIF_LIMITS	(QIF_BLIMITS | QIF_ILIMITS)
#define QIF_USAGE	(QIF_SPACE | QIF_INODES)
#define QIF_TIMES	(QIF_BTIME | QIF_ITIME)
#define QIF_ALL		(QIF_LIMITS | QIF_USAGE | QIF_TIMES)

struct if_dqblk {
	__u64 dqb_bhardlimit;
	__u64 dqb_bsoftlimit;
	__u64 dqb_curspace;
	__u64 dqb_ihardlimit;
	__u64 dqb_isoftlimit;
	__u64 dqb_curinodes;
	__u64 dqb_btime;
	__u64 dqb_itime;
	__u32 dqb_valid;
};

/*
 * Structure used for setting quota information about file via quotactl
 * Following flags are used to specify which fields are valid
 */
#define IIF_BGRACE	1
#define IIF_IGRACE	2
#define IIF_FLAGS	4
#define IIF_ALL		(IIF_BGRACE | IIF_IGRACE | IIF_FLAGS)

struct if_dqinfo {
	__u64 dqi_bgrace;
	__u64 dqi_igrace;
	__u32 dqi_flags;
	__u32 dqi_valid;
};

/*
 * Definitions for quota netlink interface
 */
#define QUOTA_NL_NOWARN 0
#define QUOTA_NL_IHARDWARN 1		/* Inode hardlimit reached */
#define QUOTA_NL_ISOFTLONGWARN 2 	/* Inode grace time expired */
#define QUOTA_NL_ISOFTWARN 3		/* Inode softlimit reached */
#define QUOTA_NL_BHARDWARN 4		/* Block hardlimit reached */
#define QUOTA_NL_BSOFTLONGWARN 5	/* Block grace time expired */
#define QUOTA_NL_BSOFTWARN 6		/* Block softlimit reached */
#define QUOTA_NL_IHARDBELOW 7		/* Usage got below inode hardlimit */
#define QUOTA_NL_ISOFTBELOW 8		/* Usage got below inode softlimit */
#define QUOTA_NL_BHARDBELOW 9		/* Usage got below block hardlimit */
#define QUOTA_NL_BSOFTBELOW 10		/* Usage got below block softlimit */

enum {
	QUOTA_NL_C_UNSPEC,
	QUOTA_NL_C_WARNING,
	__QUOTA_NL_C_MAX,
};
#define QUOTA_NL_C_MAX (__QUOTA_NL_C_MAX - 1)

enum {
	QUOTA_NL_A_UNSPEC,
	QUOTA_NL_A_QTYPE,
	QUOTA_NL_A_EXCESS_ID,
	QUOTA_NL_A_WARNING,
	QUOTA_NL_A_DEV_MAJOR,
	QUOTA_NL_A_DEV_MINOR,
	QUOTA_NL_A_CAUSED_ID,
	__QUOTA_NL_A_MAX,
};
#define QUOTA_NL_A_MAX (__QUOTA_NL_A_MAX - 1)


#ifdef __KERNEL__
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/rwsem.h>
#include <linux/spinlock.h>
#include <linux/wait.h>

#include <linux/dqblk_xfs.h>
#include <linux/dqblk_v1.h>
#include <linux/dqblk_v2.h>

#include <asm/atomic.h>

typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
typedef __u64 qsize_t;          /* Type in which we store sizes */

extern spinlock_t dq_data_lock;

/* Maximal numbers of writes for quota operation (insert/delete/update)
 * (over VFS all formats) */
#define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC)
#define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE)
#define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC)
#define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE)

/*
 * Data for one user/group kept in memory
 */
struct mem_dqblk {
	qsize_t dqb_bhardlimit;	/* absolute limit on disk blks alloc */
	qsize_t dqb_bsoftlimit;	/* preferred limit on disk blks */
	qsize_t dqb_curspace;	/* current used space */
	qsize_t dqb_ihardlimit;	/* absolute limit on allocated inodes */
	qsize_t dqb_isoftlimit;	/* preferred inode limit */
	qsize_t dqb_curinodes;	/* current # allocated inodes */
	time_t dqb_btime;	/* time limit for excessive disk use */
	time_t dqb_itime;	/* time limit for excessive inode use */
};

/*
 * Data for one quotafile kept in memory
 */
struct quota_format_type;

struct mem_dqinfo {
	struct quota_format_type *dqi_format;
	int dqi_fmt_id;		/* Id of the dqi_format - used when turning
				 * quotas on after remount RW */
	struct list_head dqi_dirty_list;	/* List of dirty dquots */
	unsigned long dqi_flags;
	unsigned int dqi_bgrace;
	unsigned int dqi_igrace;
	qsize_t dqi_maxblimit;
	qsize_t dqi_maxilimit;
	union {
		struct v1_mem_dqinfo v1_i;
		struct v2_mem_dqinfo v2_i;
	} u;
};

struct super_block;

#define DQF_MASK 0xffff		/* Mask for format specific flags */
#define DQF_INFO_DIRTY_B 16
#define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B)	/* Is info dirty? */

extern void mark_info_dirty(struct super_block *sb, int type);
static inline int info_dirty(struct mem_dqinfo *info)
{
	return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);
}

struct dqstats {
	int lookups;
	int drops;
	int reads;
	int writes;
	int cache_hits;
	int allocated_dquots;
	int free_dquots;
	int syncs;
};

extern struct dqstats dqstats;

#define DQ_MOD_B	0	/* dquot modified since read */
#define DQ_BLKS_B	1	/* uid/gid has been warned about blk limit */
#define DQ_INODES_B	2	/* uid/gid has been warned about inode limit */
#define DQ_FAKE_B	3	/* no limits only usage */
#define DQ_READ_B	4	/* dquot was read into memory */
#define DQ_ACTIVE_B	5	/* dquot is active (dquot_release not called) */

struct dquot {
	struct hlist_node dq_hash;	/* Hash list in memory */
	struct list_head dq_inuse;	/* List of all quotas */
	struct list_head dq_free;	/* Free list element */
	struct list_head dq_dirty;	/* List of dirty dquots */
	struct mutex dq_lock;		/* dquot IO lock */
	atomic_t dq_count;		/* Use count */
	wait_queue_head_t dq_wait_unused;	/* Wait queue for dquot to become unused */
	struct super_block *dq_sb;	/* superblock this applies to */
	unsigned int dq_id;		/* ID this applies to (uid, gid) */
	loff_t dq_off;			/* Offset of dquot on disk */
	unsigned long dq_flags;		/* See DQ_* */
	short dq_type;			/* Type of quota */
	struct mem_dqblk dq_dqb;	/* Diskquota usage */
};

#define NODQUOT (struct dquot *)NULL

#define QUOTA_OK          0
#define NO_QUOTA          1

/* Operations which must be implemented by each quota format */
struct quota_format_ops {
	int (*check_quota_file)(struct super_block *sb, int type);	/* Detect whether file is in our format */
	int (*read_file_info)(struct super_block *sb, int type);	/* Read main info about file - called on quotaon() */
	int (*write_file_info)(struct super_block *sb, int type);	/* Write main info about file */
	int (*free_file_info)(struct super_block *sb, int type);	/* Called on quotaoff() */
	int (*read_dqblk)(struct dquot *dquot);		/* Read structure for one user */
	int (*commit_dqblk)(struct dquot *dquot);	/* Write structure for one user */
	int (*release_dqblk)(struct dquot *dquot);	/* Called when last reference to dquot is being dropped */
};

/* Operations working with dquots */
struct dquot_operations {
	int (*initialize) (struct inode *, int);
	int (*drop) (struct inode *);
	int (*alloc_space) (struct inode *, qsize_t, int);
	int (*alloc_inode) (const struct inode *, qsize_t);
	int (*free_space) (struct inode *, qsize_t);
	int (*free_inode) (const struct inode *, qsize_t);
	int (*transfer) (struct inode *, struct iattr *);
	int (*write_dquot) (struct dquot *);		/* Ordinary dquot write */
	struct dquot *(*alloc_dquot)(struct super_block *, int);	/* Allocate memory for new dquot */
	void (*destroy_dquot)(struct dquot *);		/* Free memory for dquot */
	int (*acquire_dquot) (struct dquot *);		/* Quota is going to be created on disk */
	int (*release_dquot) (struct dquot *);		/* Quota is going to be deleted from disk */
	int (*mark_dirty) (struct dquot *);		/* Dquot is marked dirty */
	int (*write_info) (struct super_block *, int);	/* Write of quota "superblock" */
};

/* Operations handling requests from userspace */
struct quotactl_ops {
	int (*quota_on)(struct super_block *, int, int, char *, int);
	int (*quota_off)(struct super_block *, int, int);
	int (*quota_sync)(struct super_block *, int);
	int (*get_info)(struct super_block *, int, struct if_dqinfo *);
	int (*set_info)(struct super_block *, int, struct if_dqinfo *);
	int (*get_dqblk)(struct super_block *, int, qid_t, struct if_dqblk *);
	int (*set_dqblk)(struct super_block *, int, qid_t, struct if_dqblk *);
	int (*get_xstate)(struct super_block *, struct fs_quota_stat *);
	int (*set_xstate)(struct super_block *, unsigned int, int);
	int (*get_xquota)(struct super_block *, int, qid_t, struct fs_disk_quota *);
	int (*set_xquota)(struct super_block *, int, qid_t, struct fs_disk_quota *);
};

struct quota_format_type {
	int qf_fmt_id;	/* Quota format id */
	struct quota_format_ops *qf_ops;	/* Operations of format */
	struct module *qf_owner;		/* Module implementing quota format */
	struct quota_format_type *qf_next;
};

/* Quota state flags - they actually come in two flavors - for users and groups */
enum {
	_DQUOT_USAGE_ENABLED = 0,		/* Track disk usage for users */
	_DQUOT_LIMITS_ENABLED,			/* Enforce quota limits for users */
	_DQUOT_SUSPENDED,			/* User diskquotas are off, but
						 * we have necessary info in
						 * memory to turn them on */
	_DQUOT_STATE_FLAGS
};
#define DQUOT_USAGE_ENABLED	(1 << _DQUOT_USAGE_ENABLED)
#define DQUOT_LIMITS_ENABLED	(1 << _DQUOT_LIMITS_ENABLED)
#define DQUOT_SUSPENDED		(1 << _DQUOT_SUSPENDED)
#define DQUOT_STATE_FLAGS	(DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \
				 DQUOT_SUSPENDED)
/* Other quota flags */
#define DQUOT_QUOTA_SYS_FILE	(1 << 6)	/* Quota file is a special
						 * system file and user cannot
						 * touch it. Filesystem is
						 * responsible for setting
						 * S_NOQUOTA, S_NOATIME flags
						 */

static inline unsigned int dquot_state_flag(unsigned int flags, int type)
{
	if (type == USRQUOTA)
		return flags;
	return flags << _DQUOT_STATE_FLAGS;
}

static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
{
	if (type == USRQUOTA)
		return flags;
	return flags >> _DQUOT_STATE_FLAGS;
}

struct quota_info {
	unsigned int flags;			/* Flags for diskquotas on this device */
	struct mutex dqio_mutex;		/* lock device while I/O in progress */
	struct mutex dqonoff_mutex;		/* Serialize quotaon & quotaoff */
	struct rw_semaphore dqptr_sem;		/* serialize ops using quota_info struct, pointers from inode to dquots */
	struct inode *files[MAXQUOTAS];		/* inodes of quotafiles */
	struct mem_dqinfo info[MAXQUOTAS];	/* Information for each quota type */
	struct quota_format_ops *ops[MAXQUOTAS];	/* Operations for each type */
};

int register_quota_format(struct quota_format_type *fmt);
void unregister_quota_format(struct quota_format_type *fmt);

struct quota_module_name {
	int qm_fmt_id;
	char *qm_mod_name;
};

#define INIT_QUOTA_MODULE_NAMES {\
	{QFMT_VFS_OLD, "quota_v1"},\
	{QFMT_VFS_V0, "quota_v2"},\
	{0, NULL}}

#else

# /* nodep */ include <sys/cdefs.h>

__BEGIN_DECLS
long quotactl __P ((unsigned int, const char *, int, caddr_t));
__END_DECLS

#endif /* __KERNEL__ */
#endif /* _QUOTA_ */
Commit	Line	Data
1da177e4 LT	1	/*
	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.
1da177e4 LT	31	*/
	32
	33	#ifndef _LINUX_QUOTA_
	34	#define _LINUX_QUOTA_
	35
	36	#include <linux/errno.h>
	37	#include <linux/types.h>
1da177e4 LT	38
	39	#define __DQUOT_VERSION__ "dquot_6.5.1"
	40	#define __DQUOT_NUM_VERSION__ 610000+5100+1
	41
1da177e4 LT	42	#define MAXQUOTAS 2
	43	#define USRQUOTA 0 /* element used for user quotas */
	44	#define GRPQUOTA 1 /* element used for group quotas */
	45
	46	/*
	47	* Definitions for the default names of the quotas files.
	48	*/
	49	#define INITQFNAMES { \
	50	"user", /* USRQUOTA */ \
	51	"group", /* GRPQUOTA */ \
	52	"undefined", \
	53	};
	54
	55	/*
	56	* Command definitions for the 'quotactl' system call.
	57	* The commands are broken into a main command defined below
	58	* and a subcommand that is used to convey the type of
	59	* quota that is being manipulated (see above).
	60	*/
	61	#define SUBCMDMASK 0x00ff
	62	#define SUBCMDSHIFT 8
	63	#define QCMD(cmd, type) (((cmd) << SUBCMDSHIFT) \| ((type) & SUBCMDMASK))
	64
	65	#define Q_SYNC 0x800001 /* sync disk copy of a filesystems quotas */
	66	#define Q_QUOTAON 0x800002 /* turn quotas on */
	67	#define Q_QUOTAOFF 0x800003 /* turn quotas off */
	68	#define Q_GETFMT 0x800004 /* get quota format used on given filesystem */
	69	#define Q_GETINFO 0x800005 /* get information about quota files */
	70	#define Q_SETINFO 0x800006 /* set information about quota files */
	71	#define Q_GETQUOTA 0x800007 /* get user quota structure */
	72	#define Q_SETQUOTA 0x800008 /* set user quota structure */
	73
12095460 JK	74	/* Size of block in which space limits are passed through the quota
	75	* interface */
	76	#define QIF_DQBLKSIZE_BITS 10
	77	#define QIF_DQBLKSIZE (1 << QIF_DQBLKSIZE_BITS)
	78
1da177e4 LT	79	/*
	80	* Quota structure used for communication with userspace via quotactl
	81	* Following flags are used to specify which fields are valid
	82	*/
	83	#define QIF_BLIMITS 1
	84	#define QIF_SPACE 2
	85	#define QIF_ILIMITS 4
	86	#define QIF_INODES 8
	87	#define QIF_BTIME 16
	88	#define QIF_ITIME 32
	89	#define QIF_LIMITS (QIF_BLIMITS \| QIF_ILIMITS)
	90	#define QIF_USAGE (QIF_SPACE \| QIF_INODES)
	91	#define QIF_TIMES (QIF_BTIME \| QIF_ITIME)
	92	#define QIF_ALL (QIF_LIMITS \| QIF_USAGE \| QIF_TIMES)
	93
	94	struct if_dqblk {
	95	__u64 dqb_bhardlimit;
	96	__u64 dqb_bsoftlimit;
	97	__u64 dqb_curspace;
	98	__u64 dqb_ihardlimit;
	99	__u64 dqb_isoftlimit;
	100	__u64 dqb_curinodes;
	101	__u64 dqb_btime;
	102	__u64 dqb_itime;
	103	__u32 dqb_valid;
	104	};
	105
	106	/*
	107	* Structure used for setting quota information about file via quotactl
	108	* Following flags are used to specify which fields are valid
	109	*/
	110	#define IIF_BGRACE 1
	111	#define IIF_IGRACE 2
	112	#define IIF_FLAGS 4
	113	#define IIF_ALL (IIF_BGRACE \| IIF_IGRACE \| IIF_FLAGS)
	114
	115	struct if_dqinfo {
	116	__u64 dqi_bgrace;
	117	__u64 dqi_igrace;
	118	__u32 dqi_flags;
	119	__u32 dqi_valid;
	120	};
	121
8e893469 JK	122	/*
	123	* Definitions for quota netlink interface
	124	*/
	125	#define QUOTA_NL_NOWARN 0
	126	#define QUOTA_NL_IHARDWARN 1 /* Inode hardlimit reached */
	127	#define QUOTA_NL_ISOFTLONGWARN 2 /* Inode grace time expired */
	128	#define QUOTA_NL_ISOFTWARN 3 /* Inode softlimit reached */
	129	#define QUOTA_NL_BHARDWARN 4 /* Block hardlimit reached */
	130	#define QUOTA_NL_BSOFTLONGWARN 5 /* Block grace time expired */
	131	#define QUOTA_NL_BSOFTWARN 6 /* Block softlimit reached */
657d3bfa JK	132	#define QUOTA_NL_IHARDBELOW 7 /* Usage got below inode hardlimit */
	133	#define QUOTA_NL_ISOFTBELOW 8 /* Usage got below inode softlimit */
	134	#define QUOTA_NL_BHARDBELOW 9 /* Usage got below block hardlimit */
	135	#define QUOTA_NL_BSOFTBELOW 10 /* Usage got below block softlimit */
8e893469 JK	136
	137	enum {
	138	QUOTA_NL_C_UNSPEC,
	139	QUOTA_NL_C_WARNING,
	140	__QUOTA_NL_C_MAX,
	141	};
	142	#define QUOTA_NL_C_MAX (__QUOTA_NL_C_MAX - 1)
	143
	144	enum {
	145	QUOTA_NL_A_UNSPEC,
	146	QUOTA_NL_A_QTYPE,
	147	QUOTA_NL_A_EXCESS_ID,
	148	QUOTA_NL_A_WARNING,
	149	QUOTA_NL_A_DEV_MAJOR,
	150	QUOTA_NL_A_DEV_MINOR,
	151	QUOTA_NL_A_CAUSED_ID,
	152	__QUOTA_NL_A_MAX,
	153	};
	154	#define QUOTA_NL_A_MAX (__QUOTA_NL_A_MAX - 1)
	155
	156
1da177e4	157	#ifdef __KERNEL__
8b91de2e	158	#include <linux/list.h>
0409d3a3	159	#include <linux/mutex.h>
8b91de2e MW	160	#include <linux/rwsem.h>
	161	#include <linux/spinlock.h>
	162	#include <linux/wait.h>
1da177e4 LT	163
	164	#include <linux/dqblk_xfs.h>
	165	#include <linux/dqblk_v1.h>
	166	#include <linux/dqblk_v2.h>
	167
8b91de2e MW	168	#include <asm/atomic.h>
8b91de2e MW	169
74abb989 JK	170	typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
	171	typedef __u64 qsize_t; /* Type in which we store sizes */
	172
acd64b73 MF	173	extern spinlock_t dq_data_lock;
acd64b73 MF	174
1da177e4	175	/* Maximal numbers of writes for quota operation (insert/delete/update)
4e5117ba JK	176	* (over VFS all formats) */
	177	#define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC)
	178	#define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE)
	179	#define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC)
	180	#define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE)
1da177e4 LT	181
	182	/*
	183	* Data for one user/group kept in memory
	184	*/
	185	struct mem_dqblk {
12095460 JK	186	qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */
12095460 JK	187	qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */
1da177e4	188	qsize_t dqb_curspace; /* current used space */
12095460 JK	189	qsize_t dqb_ihardlimit; /* absolute limit on allocated inodes */
	190	qsize_t dqb_isoftlimit; /* preferred inode limit */
	191	qsize_t dqb_curinodes; /* current # allocated inodes */
1da177e4 LT	192	time_t dqb_btime; /* time limit for excessive disk use */
	193	time_t dqb_itime; /* time limit for excessive inode use */
	194	};
	195
	196	/*
	197	* Data for one quotafile kept in memory
	198	*/
	199	struct quota_format_type;
	200
	201	struct mem_dqinfo {
	202	struct quota_format_type *dqi_format;
0ff5af83 JK	203	int dqi_fmt_id; /* Id of the dqi_format - used when turning
0ff5af83 JK	204	* quotas on after remount RW */
1da177e4 LT	205	struct list_head dqi_dirty_list; /* List of dirty dquots */
	206	unsigned long dqi_flags;
	207	unsigned int dqi_bgrace;
	208	unsigned int dqi_igrace;
338bf9af AP	209	qsize_t dqi_maxblimit;
338bf9af AP	210	qsize_t dqi_maxilimit;
1da177e4 LT	211	union {
	212	struct v1_mem_dqinfo v1_i;
	213	struct v2_mem_dqinfo v2_i;
	214	} u;
	215	};
	216
	217	struct super_block;
	218
	219	#define DQF_MASK 0xffff /* Mask for format specific flags */
	220	#define DQF_INFO_DIRTY_B 16
	221	#define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B) /* Is info dirty? */
	222
	223	extern void mark_info_dirty(struct super_block *sb, int type);
03b06343 JK	224	static inline int info_dirty(struct mem_dqinfo *info)
	225	{
	226	return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);
	227	}
1da177e4	228
1da177e4 LT	229	struct dqstats {
	230	int lookups;
	231	int drops;
	232	int reads;
	233	int writes;
	234	int cache_hits;
	235	int allocated_dquots;
	236	int free_dquots;
	237	int syncs;
	238	};
	239
	240	extern struct dqstats dqstats;
	241
	242	#define DQ_MOD_B 0 /* dquot modified since read */
	243	#define DQ_BLKS_B 1 /* uid/gid has been warned about blk limit */
	244	#define DQ_INODES_B 2 /* uid/gid has been warned about inode limit */
	245	#define DQ_FAKE_B 3 /* no limits only usage */
	246	#define DQ_READ_B 4 /* dquot was read into memory */
	247	#define DQ_ACTIVE_B 5 /* dquot is active (dquot_release not called) */
1da177e4 LT	248
	249	struct dquot {
	250	struct hlist_node dq_hash; /* Hash list in memory */
	251	struct list_head dq_inuse; /* List of all quotas */
	252	struct list_head dq_free; /* Free list element */
	253	struct list_head dq_dirty; /* List of dirty dquots */
d3be915f	254	struct mutex dq_lock; /* dquot IO lock */
1da177e4 LT	255	atomic_t dq_count; /* Use count */
	256	wait_queue_head_t dq_wait_unused; /* Wait queue for dquot to become unused */
	257	struct super_block dq_sb; / superblock this applies to */
	258	unsigned int dq_id; /* ID this applies to (uid, gid) */
	259	loff_t dq_off; /* Offset of dquot on disk */
	260	unsigned long dq_flags; /* See DQ_* */
	261	short dq_type; /* Type of quota */
	262	struct mem_dqblk dq_dqb; /* Diskquota usage */
	263	};
	264
	265	#define NODQUOT (struct dquot *)NULL
	266
	267	#define QUOTA_OK 0
	268	#define NO_QUOTA 1
	269
	270	/* Operations which must be implemented by each quota format */
	271	struct quota_format_ops {
	272	int (check_quota_file)(struct super_block sb, int type); /* Detect whether file is in our format */
	273	int (read_file_info)(struct super_block sb, int type); /* Read main info about file - called on quotaon() */
	274	int (write_file_info)(struct super_block sb, int type); /* Write main info about file */
	275	int (free_file_info)(struct super_block sb, int type); /* Called on quotaoff() */
	276	int (read_dqblk)(struct dquot dquot); /* Read structure for one user */
	277	int (commit_dqblk)(struct dquot dquot); /* Write structure for one user */
	278	int (release_dqblk)(struct dquot dquot); /* Called when last reference to dquot is being dropped */
	279	};
	280
	281	/* Operations working with dquots */
	282	struct dquot_operations {
	283	int (initialize) (struct inode , int);
	284	int (drop) (struct inode );
	285	int (alloc_space) (struct inode , qsize_t, int);
12095460	286	int (alloc_inode) (const struct inode , qsize_t);
1da177e4	287	int (free_space) (struct inode , qsize_t);
12095460	288	int (free_inode) (const struct inode , qsize_t);
1da177e4 LT	289	int (transfer) (struct inode , struct iattr *);
1da177e4 LT	290	int (write_dquot) (struct dquot ); /* Ordinary dquot write */
74f783af JK	291	struct dquot (alloc_dquot)(struct super_block , int); / Allocate memory for new dquot */
74f783af JK	292	void (destroy_dquot)(struct dquot ); /* Free memory for dquot */
1da177e4 LT	293	int (acquire_dquot) (struct dquot ); /* Quota is going to be created on disk */
	294	int (release_dquot) (struct dquot ); /* Quota is going to be deleted from disk */
	295	int (mark_dirty) (struct dquot ); /* Dquot is marked dirty */
	296	int (write_info) (struct super_block , int); /* Write of quota "superblock" */
	297	};
	298
	299	/* Operations handling requests from userspace */
	300	struct quotactl_ops {
0ff5af83 JK	301	int (quota_on)(struct super_block , int, int, char *, int);
0ff5af83 JK	302	int (quota_off)(struct super_block , int, int);
1da177e4 LT	303	int (quota_sync)(struct super_block , int);
	304	int (get_info)(struct super_block , int, struct if_dqinfo *);
	305	int (set_info)(struct super_block , int, struct if_dqinfo *);
	306	int (get_dqblk)(struct super_block , int, qid_t, struct if_dqblk *);
	307	int (set_dqblk)(struct super_block , int, qid_t, struct if_dqblk *);
	308	int (get_xstate)(struct super_block , struct fs_quota_stat *);
	309	int (set_xstate)(struct super_block , unsigned int, int);
	310	int (get_xquota)(struct super_block , int, qid_t, struct fs_disk_quota *);
	311	int (set_xquota)(struct super_block , int, qid_t, struct fs_disk_quota *);
	312	};
	313
	314	struct quota_format_type {
	315	int qf_fmt_id; /* Quota format id */
	316	struct quota_format_ops qf_ops; / Operations of format */
	317	struct module qf_owner; / Module implementing quota format */
	318	struct quota_format_type *qf_next;
	319	};
	320
f55abc0f JK	321	/* Quota state flags - they actually come in two flavors - for users and groups */
	322	enum {
	323	_DQUOT_USAGE_ENABLED = 0, /* Track disk usage for users */
	324	_DQUOT_LIMITS_ENABLED, /* Enforce quota limits for users */
	325	_DQUOT_SUSPENDED, /* User diskquotas are off, but
0ff5af83 JK	326	* we have necessary info in
0ff5af83 JK	327	* memory to turn them on */
f55abc0f JK	328	_DQUOT_STATE_FLAGS
	329	};
	330	#define DQUOT_USAGE_ENABLED (1 << _DQUOT_USAGE_ENABLED)
	331	#define DQUOT_LIMITS_ENABLED (1 << _DQUOT_LIMITS_ENABLED)
	332	#define DQUOT_SUSPENDED (1 << _DQUOT_SUSPENDED)
	333	#define DQUOT_STATE_FLAGS (DQUOT_USAGE_ENABLED \| DQUOT_LIMITS_ENABLED \| \
	334	DQUOT_SUSPENDED)
ca785ec6 JK	335	/* Other quota flags */
	336	#define DQUOT_QUOTA_SYS_FILE (1 << 6) /* Quota file is a special
	337	* system file and user cannot
	338	* touch it. Filesystem is
	339	* responsible for setting
	340	* S_NOQUOTA, S_NOATIME flags
	341	*/
f55abc0f JK	342
	343	static inline unsigned int dquot_state_flag(unsigned int flags, int type)
	344	{
	345	if (type == USRQUOTA)
	346	return flags;
	347	return flags << _DQUOT_STATE_FLAGS;
	348	}
	349
	350	static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
	351	{
	352	if (type == USRQUOTA)
	353	return flags;
	354	return flags >> _DQUOT_STATE_FLAGS;
	355	}
1da177e4 LT	356
	357	struct quota_info {
	358	unsigned int flags; /* Flags for diskquotas on this device */
d3be915f IM	359	struct mutex dqio_mutex; /* lock device while I/O in progress */
d3be915f IM	360	struct mutex dqonoff_mutex; /* Serialize quotaon & quotaoff */
1da177e4 LT	361	struct rw_semaphore dqptr_sem; /* serialize ops using quota_info struct, pointers from inode to dquots */
1da177e4 LT	362	struct inode files[MAXQUOTAS]; / inodes of quotafiles */
1da177e4 LT	363	struct mem_dqinfo info[MAXQUOTAS]; /* Information for each quota type */
	364	struct quota_format_ops ops[MAXQUOTAS]; / Operations for each type */
	365	};
	366
1da177e4 LT	367	int register_quota_format(struct quota_format_type *fmt);
	368	void unregister_quota_format(struct quota_format_type *fmt);
	369
	370	struct quota_module_name {
	371	int qm_fmt_id;
	372	char *qm_mod_name;
	373	};
	374
	375	#define INIT_QUOTA_MODULE_NAMES {\
	376	{QFMT_VFS_OLD, "quota_v1"},\
	377	{QFMT_VFS_V0, "quota_v2"},\
	378	{0, NULL}}
	379
	380	#else
	381
	382	# /* nodep */ include <sys/cdefs.h>
	383
	384	__BEGIN_DECLS
	385	long quotactl __P ((unsigned int, const char *, int, caddr_t));
	386	__END_DECLS
	387
	388	#endif /* __KERNEL__ */
	389	#endif /* _QUOTA_ */