root/include/linux/quotaio_v2.h

INCLUDED FROM

/*
 *      Definitions of structures for vfsv0 quota format
 */

#ifndef _LINUX_QUOTAIO_V2_H
#define _LINUX_QUOTAIO_V2_H

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

/*
 * Definitions of magics and versions of current quota files
 */
#define V2_INITQMAGICS {\
        0xd9c01f11,     /* USRQUOTA */\
        0xd9c01927      /* GRPQUOTA */\
}

#define V2_INITQVERSIONS {\
        0,              /* USRQUOTA */\
        0               /* GRPQUOTA */\
}

/*
 * The following structure defines the format of the disk quota file
 * (as it appears on disk) - the file is a radix tree whose leaves point
 * to blocks of these structures.
 */
struct v2_disk_dqblk {
        __le32 dqb_id;          /* id this quota applies to */
        __le32 dqb_ihardlimit;  /* absolute limit on allocated inodes */
        __le32 dqb_isoftlimit;  /* preferred inode limit */
        __le32 dqb_curinodes;   /* current # allocated inodes */
        __le32 dqb_bhardlimit;  /* absolute limit on disk space (in QUOTABLOCK_SIZE) */
        __le32 dqb_bsoftlimit;  /* preferred limit on disk space (in QUOTABLOCK_SIZE) */
        __le64 dqb_curspace;    /* current space occupied (in bytes) */
        __le64 dqb_btime;       /* time limit for excessive disk use */
        __le64 dqb_itime;       /* time limit for excessive inode use */
};

/*
 * Here are header structures as written on disk and their in-memory copies
 */
/* First generic header */
struct v2_disk_dqheader {
        __le32 dqh_magic;       /* Magic number identifying file */
        __le32 dqh_version;     /* File version */
};

/* Header with type and version specific information */
struct v2_disk_dqinfo {
        __le32 dqi_bgrace;      /* Time before block soft limit becomes hard limit */
        __le32 dqi_igrace;      /* Time before inode soft limit becomes hard limit */
        __le32 dqi_flags;       /* Flags for quotafile (DQF_*) */
        __le32 dqi_blocks;      /* Number of blocks in file */
        __le32 dqi_free_blk;    /* Number of first free block in the list */
        __le32 dqi_free_entry;  /* Number of block with at least one free entry */
};

/*
 *  Structure of header of block with quota structures. It is padded to 16 bytes so
 *  there will be space for exactly 21 quota-entries in a block
 */
struct v2_disk_dqdbheader {
        __le32 dqdh_next_free;  /* Number of next block with free entry */
        __le32 dqdh_prev_free;  /* Number of previous block with free entry */
        __le16 dqdh_entries;    /* Number of valid entries in block */
        __le16 dqdh_pad1;
        __le32 dqdh_pad2;
};

#define V2_DQINFOOFF    sizeof(struct v2_disk_dqheader) /* Offset of info header in file */
#define V2_DQBLKSIZE_BITS       10
#define V2_DQBLKSIZE    (1 << V2_DQBLKSIZE_BITS)        /* Size of block with quota structures */
#define V2_DQTREEOFF    1               /* Offset of tree in file in blocks */
#define V2_DQTREEDEPTH  4               /* Depth of quota tree */
#define V2_DQSTRINBLK   ((V2_DQBLKSIZE - sizeof(struct v2_disk_dqdbheader)) / sizeof(struct v2_disk_dqblk))     /* Number of entries in one blocks */

#endif /* _LINUX_QUOTAIO_V2_H */