/*
 * 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 2.0 1996/11/17 16:48:14 mvw Exp mvw $
 */

#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

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

/* 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;
};

/*
 * 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 */

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/spinlock.h>
#include <linux/rwsem.h>
#include <linux/mutex.h>

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

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 {
        __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;
        struct list_head dqi_dirty_list;        /* List of dirty dquots */
        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;
};

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);
#define info_dirty(info) test_bit(DQF_INFO_DIRTY_B, &(info)->dqi_flags)
#define info_any_dquot_dirty(info) (!list_empty(&(info)->dqi_dirty_list))
#define info_any_dirty(info) (info_dirty(info) || info_any_dquot_dirty(info))

#define sb_dqopt(sb) (&(sb)->s_dquot)
#define sb_dqinfo(sb, type) (sb_dqopt(sb)->info+(type))

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 *, unsigned long);
        int (*free_space) (struct inode *, qsize_t);
        int (*free_inode) (const struct inode *, unsigned long);
        int (*transfer) (struct inode *, struct iattr *);
        int (*write_dquot) (struct dquot *);            /* Ordinary dquot write */
        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 (*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 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 */
};

/* Inline would be better but we need to dereference super_block which is not defined yet */
int mark_dquot_dirty(struct dquot *dquot);

#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);

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_ */