[linux-2.6-block.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_6.5.2"

#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 */

/* Quota format type IDs */
#define	QFMT_VFS_OLD 1
#define	QFMT_VFS_V0 2

/* 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
 */
enum {
	QIF_BLIMITS_B = 0,
	QIF_SPACE_B,
	QIF_ILIMITS_B,
	QIF_INODES_B,
	QIF_BTIME_B,
	QIF_ITIME_B,
};

#define QIF_BLIMITS	(1 << QIF_BLIMITS_B)
#define QIF_SPACE	(1 << QIF_SPACE_B)
#define QIF_ILIMITS	(1 << QIF_ILIMITS_B)
#define QIF_INODES	(1 << QIF_INODES_B)
#define QIF_BTIME	(1 << QIF_BTIME_B)
#define QIF_ITIME	(1 << QIF_ITIME_B)
#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 long long 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;
	void *dqi_priv;
};

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) */
#define DQ_LASTSET_B	6	/* Following 6 bits (see QIF_) are reserved\
				 * for the mask of entries set via SETQUOTA\
				 * quotactl. They are set under dq_data_lock\
				 * and the quota format handling dquot can\
				 * clear them when it sees fit. */

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
						 */
#define DQUOT_NEGATIVE_USAGE	(1 << 7)	/* Allow negative quota usage */

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	38
571b46e4	39	#define __DQUOT_VERSION__ "dquot_6.5.2"
1da177e4	40
1da177e4 LT	41	#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
5cd9d5bb JK	73	/* Quota format type IDs */
	74	#define QFMT_VFS_OLD 1
	75	#define QFMT_VFS_V0 2
	76
12095460 JK	77	/* Size of block in which space limits are passed through the quota
	78	* interface */
	79	#define QIF_DQBLKSIZE_BITS 10
	80	#define QIF_DQBLKSIZE (1 << QIF_DQBLKSIZE_BITS)
	81
1da177e4 LT	82	/*
	83	* Quota structure used for communication with userspace via quotactl
	84	* Following flags are used to specify which fields are valid
	85	*/
4d59bce4 JK	86	enum {
	87	QIF_BLIMITS_B = 0,
	88	QIF_SPACE_B,
	89	QIF_ILIMITS_B,
	90	QIF_INODES_B,
	91	QIF_BTIME_B,
	92	QIF_ITIME_B,
	93	};
	94
	95	#define QIF_BLIMITS (1 << QIF_BLIMITS_B)
	96	#define QIF_SPACE (1 << QIF_SPACE_B)
	97	#define QIF_ILIMITS (1 << QIF_ILIMITS_B)
	98	#define QIF_INODES (1 << QIF_INODES_B)
	99	#define QIF_BTIME (1 << QIF_BTIME_B)
	100	#define QIF_ITIME (1 << QIF_ITIME_B)
1da177e4 LT	101	#define QIF_LIMITS (QIF_BLIMITS \| QIF_ILIMITS)
	102	#define QIF_USAGE (QIF_SPACE \| QIF_INODES)
	103	#define QIF_TIMES (QIF_BTIME \| QIF_ITIME)
	104	#define QIF_ALL (QIF_LIMITS \| QIF_USAGE \| QIF_TIMES)
	105
	106	struct if_dqblk {
	107	__u64 dqb_bhardlimit;
	108	__u64 dqb_bsoftlimit;
	109	__u64 dqb_curspace;
	110	__u64 dqb_ihardlimit;
	111	__u64 dqb_isoftlimit;
	112	__u64 dqb_curinodes;
	113	__u64 dqb_btime;
	114	__u64 dqb_itime;
	115	__u32 dqb_valid;
	116	};
	117
	118	/*
	119	* Structure used for setting quota information about file via quotactl
	120	* Following flags are used to specify which fields are valid
	121	*/
	122	#define IIF_BGRACE 1
	123	#define IIF_IGRACE 2
	124	#define IIF_FLAGS 4
	125	#define IIF_ALL (IIF_BGRACE \| IIF_IGRACE \| IIF_FLAGS)
	126
	127	struct if_dqinfo {
	128	__u64 dqi_bgrace;
	129	__u64 dqi_igrace;
	130	__u32 dqi_flags;
	131	__u32 dqi_valid;
	132	};
	133
8e893469 JK	134	/*
	135	* Definitions for quota netlink interface
	136	*/
	137	#define QUOTA_NL_NOWARN 0
	138	#define QUOTA_NL_IHARDWARN 1 /* Inode hardlimit reached */
	139	#define QUOTA_NL_ISOFTLONGWARN 2 /* Inode grace time expired */
	140	#define QUOTA_NL_ISOFTWARN 3 /* Inode softlimit reached */
	141	#define QUOTA_NL_BHARDWARN 4 /* Block hardlimit reached */
	142	#define QUOTA_NL_BSOFTLONGWARN 5 /* Block grace time expired */
	143	#define QUOTA_NL_BSOFTWARN 6 /* Block softlimit reached */
657d3bfa JK	144	#define QUOTA_NL_IHARDBELOW 7 /* Usage got below inode hardlimit */
	145	#define QUOTA_NL_ISOFTBELOW 8 /* Usage got below inode softlimit */
	146	#define QUOTA_NL_BHARDBELOW 9 /* Usage got below block hardlimit */
	147	#define QUOTA_NL_BSOFTBELOW 10 /* Usage got below block softlimit */
8e893469 JK	148
	149	enum {
	150	QUOTA_NL_C_UNSPEC,
	151	QUOTA_NL_C_WARNING,
	152	__QUOTA_NL_C_MAX,
	153	};
	154	#define QUOTA_NL_C_MAX (__QUOTA_NL_C_MAX - 1)
	155
	156	enum {
	157	QUOTA_NL_A_UNSPEC,
	158	QUOTA_NL_A_QTYPE,
	159	QUOTA_NL_A_EXCESS_ID,
	160	QUOTA_NL_A_WARNING,
	161	QUOTA_NL_A_DEV_MAJOR,
	162	QUOTA_NL_A_DEV_MINOR,
	163	QUOTA_NL_A_CAUSED_ID,
	164	__QUOTA_NL_A_MAX,
	165	};
	166	#define QUOTA_NL_A_MAX (__QUOTA_NL_A_MAX - 1)
	167
	168
1da177e4	169	#ifdef __KERNEL__
8b91de2e	170	#include <linux/list.h>
0409d3a3	171	#include <linux/mutex.h>
8b91de2e MW	172	#include <linux/rwsem.h>
	173	#include <linux/spinlock.h>
	174	#include <linux/wait.h>
1da177e4 LT	175
	176	#include <linux/dqblk_xfs.h>
	177	#include <linux/dqblk_v1.h>
	178	#include <linux/dqblk_v2.h>
	179
8b91de2e MW	180	#include <asm/atomic.h>
8b91de2e MW	181
74abb989	182	typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
db49d2df	183	typedef long long qsize_t; /* Type in which we store sizes */
74abb989	184
acd64b73 MF	185	extern spinlock_t dq_data_lock;
acd64b73 MF	186
1da177e4	187	/* Maximal numbers of writes for quota operation (insert/delete/update)
4e5117ba JK	188	* (over VFS all formats) */
	189	#define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC)
	190	#define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE)
	191	#define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC)
	192	#define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE)
1da177e4 LT	193
	194	/*
	195	* Data for one user/group kept in memory
	196	*/
	197	struct mem_dqblk {
12095460 JK	198	qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */
12095460 JK	199	qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */
1da177e4	200	qsize_t dqb_curspace; /* current used space */
12095460 JK	201	qsize_t dqb_ihardlimit; /* absolute limit on allocated inodes */
	202	qsize_t dqb_isoftlimit; /* preferred inode limit */
	203	qsize_t dqb_curinodes; /* current # allocated inodes */
1da177e4 LT	204	time_t dqb_btime; /* time limit for excessive disk use */
	205	time_t dqb_itime; /* time limit for excessive inode use */
	206	};
	207
	208	/*
	209	* Data for one quotafile kept in memory
	210	*/
	211	struct quota_format_type;
	212
	213	struct mem_dqinfo {
	214	struct quota_format_type *dqi_format;
0ff5af83 JK	215	int dqi_fmt_id; /* Id of the dqi_format - used when turning
0ff5af83 JK	216	* quotas on after remount RW */
1da177e4 LT	217	struct list_head dqi_dirty_list; /* List of dirty dquots */
	218	unsigned long dqi_flags;
	219	unsigned int dqi_bgrace;
	220	unsigned int dqi_igrace;
338bf9af AP	221	qsize_t dqi_maxblimit;
338bf9af AP	222	qsize_t dqi_maxilimit;
e3d4d56b	223	void *dqi_priv;
1da177e4 LT	224	};
	225
	226	struct super_block;
	227
	228	#define DQF_MASK 0xffff /* Mask for format specific flags */
	229	#define DQF_INFO_DIRTY_B 16
	230	#define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B) /* Is info dirty? */
	231
	232	extern void mark_info_dirty(struct super_block *sb, int type);
03b06343 JK	233	static inline int info_dirty(struct mem_dqinfo *info)
	234	{
	235	return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);
	236	}
1da177e4	237
1da177e4 LT	238	struct dqstats {
	239	int lookups;
	240	int drops;
	241	int reads;
	242	int writes;
	243	int cache_hits;
	244	int allocated_dquots;
	245	int free_dquots;
	246	int syncs;
	247	};
	248
	249	extern struct dqstats dqstats;
	250
	251	#define DQ_MOD_B 0 /* dquot modified since read */
	252	#define DQ_BLKS_B 1 /* uid/gid has been warned about blk limit */
	253	#define DQ_INODES_B 2 /* uid/gid has been warned about inode limit */
	254	#define DQ_FAKE_B 3 /* no limits only usage */
	255	#define DQ_READ_B 4 /* dquot was read into memory */
	256	#define DQ_ACTIVE_B 5 /* dquot is active (dquot_release not called) */
4d59bce4 JK	257	#define DQ_LASTSET_B 6 /* Following 6 bits (see QIF_) are reserved\
	258	* for the mask of entries set via SETQUOTA\
	259	* quotactl. They are set under dq_data_lock\
	260	* and the quota format handling dquot can\
	261	* clear them when it sees fit. */
1da177e4 LT	262
	263	struct dquot {
	264	struct hlist_node dq_hash; /* Hash list in memory */
	265	struct list_head dq_inuse; /* List of all quotas */
	266	struct list_head dq_free; /* Free list element */
	267	struct list_head dq_dirty; /* List of dirty dquots */
d3be915f	268	struct mutex dq_lock; /* dquot IO lock */
1da177e4 LT	269	atomic_t dq_count; /* Use count */
	270	wait_queue_head_t dq_wait_unused; /* Wait queue for dquot to become unused */
	271	struct super_block dq_sb; / superblock this applies to */
	272	unsigned int dq_id; /* ID this applies to (uid, gid) */
	273	loff_t dq_off; /* Offset of dquot on disk */
	274	unsigned long dq_flags; /* See DQ_* */
	275	short dq_type; /* Type of quota */
	276	struct mem_dqblk dq_dqb; /* Diskquota usage */
	277	};
	278
	279	#define NODQUOT (struct dquot *)NULL
	280
	281	#define QUOTA_OK 0
	282	#define NO_QUOTA 1
	283
	284	/* Operations which must be implemented by each quota format */
	285	struct quota_format_ops {
	286	int (check_quota_file)(struct super_block sb, int type); /* Detect whether file is in our format */
	287	int (read_file_info)(struct super_block sb, int type); /* Read main info about file - called on quotaon() */
	288	int (write_file_info)(struct super_block sb, int type); /* Write main info about file */
	289	int (free_file_info)(struct super_block sb, int type); /* Called on quotaoff() */
	290	int (read_dqblk)(struct dquot dquot); /* Read structure for one user */
	291	int (commit_dqblk)(struct dquot dquot); /* Write structure for one user */
	292	int (release_dqblk)(struct dquot dquot); /* Called when last reference to dquot is being dropped */
	293	};
	294
	295	/* Operations working with dquots */
	296	struct dquot_operations {
	297	int (initialize) (struct inode , int);
	298	int (drop) (struct inode );
	299	int (alloc_space) (struct inode , qsize_t, int);
12095460	300	int (alloc_inode) (const struct inode , qsize_t);
1da177e4	301	int (free_space) (struct inode , qsize_t);
12095460	302	int (free_inode) (const struct inode , qsize_t);
1da177e4 LT	303	int (transfer) (struct inode , struct iattr *);
1da177e4 LT	304	int (write_dquot) (struct dquot ); /* Ordinary dquot write */
74f783af JK	305	struct dquot (alloc_dquot)(struct super_block , int); / Allocate memory for new dquot */
74f783af JK	306	void (destroy_dquot)(struct dquot ); /* Free memory for dquot */
1da177e4 LT	307	int (acquire_dquot) (struct dquot ); /* Quota is going to be created on disk */
	308	int (release_dquot) (struct dquot ); /* Quota is going to be deleted from disk */
	309	int (mark_dirty) (struct dquot ); /* Dquot is marked dirty */
	310	int (write_info) (struct super_block , int); /* Write of quota "superblock" */
	311	};
	312
	313	/* Operations handling requests from userspace */
	314	struct quotactl_ops {
0ff5af83 JK	315	int (quota_on)(struct super_block , int, int, char *, int);
0ff5af83 JK	316	int (quota_off)(struct super_block , int, int);
1da177e4 LT	317	int (quota_sync)(struct super_block , int);
	318	int (get_info)(struct super_block , int, struct if_dqinfo *);
	319	int (set_info)(struct super_block , int, struct if_dqinfo *);
	320	int (get_dqblk)(struct super_block , int, qid_t, struct if_dqblk *);
	321	int (set_dqblk)(struct super_block , int, qid_t, struct if_dqblk *);
	322	int (get_xstate)(struct super_block , struct fs_quota_stat *);
	323	int (set_xstate)(struct super_block , unsigned int, int);
	324	int (get_xquota)(struct super_block , int, qid_t, struct fs_disk_quota *);
	325	int (set_xquota)(struct super_block , int, qid_t, struct fs_disk_quota *);
	326	};
	327
	328	struct quota_format_type {
	329	int qf_fmt_id; /* Quota format id */
	330	struct quota_format_ops qf_ops; / Operations of format */
	331	struct module qf_owner; / Module implementing quota format */
	332	struct quota_format_type *qf_next;
	333	};
	334
f55abc0f JK	335	/* Quota state flags - they actually come in two flavors - for users and groups */
	336	enum {
	337	_DQUOT_USAGE_ENABLED = 0, /* Track disk usage for users */
	338	_DQUOT_LIMITS_ENABLED, /* Enforce quota limits for users */
	339	_DQUOT_SUSPENDED, /* User diskquotas are off, but
0ff5af83 JK	340	* we have necessary info in
0ff5af83 JK	341	* memory to turn them on */
f55abc0f JK	342	_DQUOT_STATE_FLAGS
	343	};
	344	#define DQUOT_USAGE_ENABLED (1 << _DQUOT_USAGE_ENABLED)
	345	#define DQUOT_LIMITS_ENABLED (1 << _DQUOT_LIMITS_ENABLED)
	346	#define DQUOT_SUSPENDED (1 << _DQUOT_SUSPENDED)
	347	#define DQUOT_STATE_FLAGS (DQUOT_USAGE_ENABLED \| DQUOT_LIMITS_ENABLED \| \
	348	DQUOT_SUSPENDED)
ca785ec6 JK	349	/* Other quota flags */
	350	#define DQUOT_QUOTA_SYS_FILE (1 << 6) /* Quota file is a special
	351	* system file and user cannot
	352	* touch it. Filesystem is
	353	* responsible for setting
	354	* S_NOQUOTA, S_NOATIME flags
	355	*/
db49d2df	356	#define DQUOT_NEGATIVE_USAGE (1 << 7) /* Allow negative quota usage */
f55abc0f JK	357
	358	static inline unsigned int dquot_state_flag(unsigned int flags, int type)
	359	{
	360	if (type == USRQUOTA)
	361	return flags;
	362	return flags << _DQUOT_STATE_FLAGS;
	363	}
	364
	365	static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
	366	{
	367	if (type == USRQUOTA)
	368	return flags;
	369	return flags >> _DQUOT_STATE_FLAGS;
	370	}
1da177e4 LT	371
	372	struct quota_info {
	373	unsigned int flags; /* Flags for diskquotas on this device */
d3be915f IM	374	struct mutex dqio_mutex; /* lock device while I/O in progress */
d3be915f IM	375	struct mutex dqonoff_mutex; /* Serialize quotaon & quotaoff */
1da177e4 LT	376	struct rw_semaphore dqptr_sem; /* serialize ops using quota_info struct, pointers from inode to dquots */
1da177e4 LT	377	struct inode files[MAXQUOTAS]; / inodes of quotafiles */
1da177e4 LT	378	struct mem_dqinfo info[MAXQUOTAS]; /* Information for each quota type */
	379	struct quota_format_ops ops[MAXQUOTAS]; / Operations for each type */
	380	};
	381
1da177e4 LT	382	int register_quota_format(struct quota_format_type *fmt);
	383	void unregister_quota_format(struct quota_format_type *fmt);
	384
	385	struct quota_module_name {
	386	int qm_fmt_id;
	387	char *qm_mod_name;
	388	};
	389
	390	#define INIT_QUOTA_MODULE_NAMES {\
	391	{QFMT_VFS_OLD, "quota_v1"},\
	392	{QFMT_VFS_V0, "quota_v2"},\
	393	{0, NULL}}
	394
	395	#else
	396
	397	# /* nodep */ include <sys/cdefs.h>
	398
	399	__BEGIN_DECLS
	400	long quotactl __P ((unsigned int, const char *, int, caddr_t));
	401	__END_DECLS
	402
	403	#endif /* __KERNEL__ */
	404	#endif /* _QUOTA_ */