root/fs/omfs/omfs_fs.h

INCLUDED FROM

#ifndef _OMFS_FS_H
#define _OMFS_FS_H

/* OMFS On-disk structures */

#define OMFS_MAGIC 0xC2993D87
#define OMFS_IMAGIC 0xD2

#define OMFS_DIR 'D'
#define OMFS_FILE 'F'
#define OMFS_INODE_NORMAL 'e'
#define OMFS_INODE_CONTINUATION 'c'
#define OMFS_INODE_SYSTEM 's'
#define OMFS_NAMELEN 256
#define OMFS_DIR_START 0x1b8
#define OMFS_EXTENT_START 0x1d0
#define OMFS_EXTENT_CONT 0x40
#define OMFS_XOR_COUNT 19
#define OMFS_MAX_BLOCK_SIZE 8192

struct omfs_super_block {
        char s_fill1[256];
        __be64 s_root_block;            /* block number of omfs_root_block */
        __be64 s_num_blocks;            /* total number of FS blocks */
        __be32 s_magic;                 /* OMFS_MAGIC */
        __be32 s_blocksize;             /* size of a block */
        __be32 s_mirrors;               /* # of mirrors of system blocks */
        __be32 s_sys_blocksize;         /* size of non-data blocks */
};

struct omfs_header {
        __be64 h_self;                  /* FS block where this is located */
        __be32 h_body_size;             /* size of useful data after header */
        __be16 h_crc;                   /* crc-ccitt of body_size bytes */
        char h_fill1[2];
        u8 h_version;                   /* version, always 1 */
        char h_type;                    /* OMFS_INODE_X */
        u8 h_magic;                     /* OMFS_IMAGIC */
        u8 h_check_xor;                 /* XOR of header bytes before this */
        __be32 h_fill2;
};

struct omfs_root_block {
        struct omfs_header r_head;      /* header */
        __be64 r_fill1;
        __be64 r_num_blocks;            /* total number of FS blocks */
        __be64 r_root_dir;              /* block # of root directory */
        __be64 r_bitmap;                /* block # of free space bitmap */
        __be32 r_blocksize;             /* size of a block */
        __be32 r_clustersize;           /* size allocated for data blocks */
        __be64 r_mirrors;               /* # of mirrors of system blocks */
        char r_name[OMFS_NAMELEN];      /* partition label */
};

struct omfs_inode {
        struct omfs_header i_head;      /* header */
        __be64 i_parent;                /* parent containing this inode */
        __be64 i_sibling;               /* next inode in hash bucket */
        __be64 i_ctime;                 /* ctime, in milliseconds */
        char i_fill1[35];
        char i_type;                    /* OMFS_[DIR,FILE] */
        __be32 i_fill2;
        char i_fill3[64];
        char i_name[OMFS_NAMELEN];      /* filename */
        __be64 i_size;                  /* size of file, in bytes */
};

struct omfs_extent_entry {
        __be64 e_cluster;               /* start location of a set of blocks */
        __be64 e_blocks;                /* number of blocks after e_cluster */
};

struct omfs_extent {
        __be64 e_next;                  /* next extent table location */
        __be32 e_extent_count;          /* total # extents in this table */
        __be32 e_fill;
        struct omfs_extent_entry e_entry;       /* start of extent entries */
};

#endif