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/*

 * 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.

 *

 * Version: $Id: quota.h,v 1.1 2004-01-28 15:26:24 giacomo Exp $

 */

#ifndef _LINUX_QUOTA_

#define _LINUX_QUOTA_

#include <linux/errno.h>

#include <linux/types.h>

#include <linux/spinlock.h>

#define __DQUOT_VERSION__       "dquot_6.5.1"

#define __DQUOT_NUM_VERSION__   6*10000+5*100+1

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_list_lock;

extern spinlock_t dq_data_lock;

/* Size of blocks in which are counted size limits */

#define QUOTABLOCK_BITS 10

#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)

/* Conversion routines from and to quota blocks */

#define qb2kb(x) ((x) << (QUOTABLOCK_BITS-10))

#define kb2qb(x) ((x) >> (QUOTABLOCK_BITS-10))

#define toqb(x) (((x) + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS)

#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 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;

};

#ifdef __KERNEL__

#include <linux/dqblk_xfs.h>

#include <linux/dqblk_v1.h>

#include <linux/dqblk_v2.h>

/*

 * Data for one user/group kept in memory

 */

struct mem_dqblk {

        __u32 dqb_bhardlimit;   /* absolute limit on disk blks alloc */

        __u32 dqb_bsoftlimit;   /* preferred limit on disk blks */

        qsize_t dqb_curspace;   /* current used space */

        __u32 dqb_ihardlimit;   /* absolute limit on allocated inodes */

        __u32 dqb_isoftlimit;   /* preferred inode limit */

        __u32 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;

        unsigned long dqi_flags;

        unsigned int dqi_bgrace;

        unsigned int dqi_igrace;

        union {

                struct v1_mem_dqinfo v1_i;

                struct v2_mem_dqinfo v2_i;

        } u;

};

#define DQF_MASK 0xffff         /* Mask for format specific flags */

#define DQF_INFO_DIRTY_B 16

#define DQF_ANY_DQUOT_DIRTY_B 17

#define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B)  /* Is info dirty? */

#define DQF_ANY_DQUOT_DIRTY (1 << DQF_ANY_DQUOT_DIRTY_B) /* Is any dquot dirty? */

extern inline void mark_info_dirty(struct mem_dqinfo *info)

{

        set_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);

}

#define info_dirty(info) test_bit(DQF_INFO_DIRTY_B, &(info)->dqi_flags)

#define info_any_dquot_dirty(info) test_bit(DQF_ANY_DQUOT_DIRTY_B, &(info)->dqi_flags)

#define info_any_dirty(info) (info_dirty(info) || info_any_dquot_dirty(info))

#define sb_dqopt(sb) (&(sb)->s_dquot)

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 NR_DQHASH 43            /* Just an arbitrary number */

#define DQ_MOD_B        0

#define DQ_BLKS_B       1

#define DQ_INODES_B     2

#define DQ_FAKE_B       3

#define DQ_MOD        (1 << DQ_MOD_B)   /* dquot modified since read */

#define DQ_BLKS       (1 << DQ_BLKS_B)  /* uid/gid has been warned about blk limit */

#define DQ_INODES     (1 << DQ_INODES_B)        /* uid/gid has been warned about inode limit */

#define DQ_FAKE       (1 << DQ_FAKE_B)  /* no limits only usage */

struct dquot {

        struct list_head dq_hash;       /* Hash list in memory */

        struct list_head dq_inuse;      /* List of all quotas */

        struct list_head dq_free;       /* Free list element */

        struct semaphore dq_lock;       /* dquot IO lock */

        atomic_t dq_count;              /* Use count */

        /* fields after this point are cleared when invalidating */

        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 (or delete) structure for one user */

};

/* Operations working with dquots */

struct dquot_operations {

        void (*initialize) (struct inode *, int);

        void (*drop) (struct inode *);

        int (*alloc_space) (struct inode *, qsize_t, int);

        int (*alloc_inode) (const struct inode *, unsigned long);

        void (*free_space) (struct inode *, qsize_t);

        void (*free_inode) (const struct inode *, unsigned long);

        int (*transfer) (struct inode *, struct iattr *);

        int (*sync_dquot) (struct dquot *);

};

/* Operations handling requests from userspace */

struct quotactl_ops {

        int (*quota_on)(struct super_block *, int, int, char *);

        int (*quota_off)(struct super_block *, 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;

};

#define DQUOT_USR_ENABLED       0x01            /* User diskquotas enabled */

#define DQUOT_GRP_ENABLED       0x02            /* Group diskquotas enabled */

struct quota_info {

        unsigned int flags;                     /* Flags for diskquotas on this device */

        struct semaphore dqio_sem;              /* lock device while I/O in progress */

        struct semaphore dqonoff_sem;           /* Serialize quotaon & quotaoff */

        struct rw_semaphore dqptr_sem;          /* serialize ops using quota_info struct, pointers from inode to dquots */

        struct file *files[MAXQUOTAS];          /* fp's to quotafiles */

        struct mem_dqinfo info[MAXQUOTAS];      /* Information for each quota type */

        struct quota_format_ops *ops[MAXQUOTAS];        /* Operations for each type */

};

/* Inline would be better but we need to dereference super_block which is not defined yet */

#define mark_dquot_dirty(dquot) do {\

        set_bit(DQF_ANY_DQUOT_DIRTY_B, &(sb_dqopt((dquot)->dq_sb)->info[(dquot)->dq_type].dqi_flags));\

        set_bit(DQ_MOD_B, &(dquot)->dq_flags);\

} while (0)

#define dquot_dirty(dquot) test_bit(DQ_MOD_B, &(dquot)->dq_flags)

#define sb_has_quota_enabled(sb, type) ((type)==USRQUOTA ? \

        (sb_dqopt(sb)->flags & DQUOT_USR_ENABLED) : (sb_dqopt(sb)->flags & DQUOT_GRP_ENABLED))

#define sb_any_quota_enabled(sb) (sb_has_quota_enabled(sb, USRQUOTA) | \

                                  sb_has_quota_enabled(sb, GRPQUOTA))

int register_quota_format(struct quota_format_type *fmt);

void unregister_quota_format(struct quota_format_type *fmt);

void init_dquot_operations(struct dquot_operations *fsdqops);

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_ */