[linux.git] / include / linux / bfs_fs.h

/*
 *	include/linux/bfs_fs.h - BFS data structures on disk.
 *	Copyright (C) 1999 Tigran Aivazian <[email protected]>
 */

#ifndef _LINUX_BFS_FS_H
#define _LINUX_BFS_FS_H

#include <linux/types.h>

#define BFS_BSIZE_BITS		9
#define BFS_BSIZE		(1<<BFS_BSIZE_BITS)

#define BFS_MAGIC		0x1BADFACE
#define BFS_ROOT_INO		2
#define BFS_INODES_PER_BLOCK	8

/* SVR4 vnode type values (bfs_inode->i_vtype) */
#define BFS_VDIR 2L
#define BFS_VREG 1L

/* BFS inode layout on disk */
struct bfs_inode {
	__le16 i_ino;
	__u16 i_unused;
	__le32 i_sblock;
	__le32 i_eblock;
	__le32 i_eoffset;
	__le32 i_vtype;
	__le32 i_mode;
	__le32 i_uid;
	__le32 i_gid;
	__le32 i_nlink;
	__le32 i_atime;
	__le32 i_mtime;
	__le32 i_ctime;
	__u32 i_padding[4];
};

#define BFS_NAMELEN		14	
#define BFS_DIRENT_SIZE		16
#define BFS_DIRS_PER_BLOCK	32

struct bfs_dirent {
	__le16 ino;
	char name[BFS_NAMELEN];
};

/* BFS superblock layout on disk */
struct bfs_super_block {
	__le32 s_magic;
	__le32 s_start;
	__le32 s_end;
	__le32 s_from;
	__le32 s_to;
	__s32 s_bfrom;
	__s32 s_bto;
	char  s_fsname[6];
	char  s_volume[6];
	__u32 s_padding[118];
};


#define BFS_OFF2INO(offset) \
        ((((offset) - BFS_BSIZE) / sizeof(struct bfs_inode)) + BFS_ROOT_INO)

#define BFS_INO2OFF(ino) \
	((__u32)(((ino) - BFS_ROOT_INO) * sizeof(struct bfs_inode)) + BFS_BSIZE)
#define BFS_NZFILESIZE(ip) \
        ((le32_to_cpu((ip)->i_eoffset) + 1) -  le32_to_cpu((ip)->i_sblock) * BFS_BSIZE)

#define BFS_FILESIZE(ip) \
        ((ip)->i_sblock == 0 ? 0 : BFS_NZFILESIZE(ip))

#define BFS_FILEBLOCKS(ip) \
        ((ip)->i_sblock == 0 ? 0 : (le32_to_cpu((ip)->i_eblock) + 1) -  le32_to_cpu((ip)->i_sblock))
#define BFS_UNCLEAN(bfs_sb, sb)	\
	((le32_to_cpu(bfs_sb->s_from) != -1) && (le32_to_cpu(bfs_sb->s_to) != -1) && !(sb->s_flags & MS_RDONLY))


#endif	/* _LINUX_BFS_FS_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* include/linux/bfs_fs.h - BFS data structures on disk.
	3	* Copyright (C) 1999 Tigran Aivazian <[email protected]>
	4	*/
	5
	6	#ifndef _LINUX_BFS_FS_H
	7	#define _LINUX_BFS_FS_H
	8
1da9ebd5 JSR	9	#include <linux/types.h>
1da9ebd5 JSR	10
1da177e4 LT	11	#define BFS_BSIZE_BITS 9
	12	#define BFS_BSIZE (1<<BFS_BSIZE_BITS)
	13
	14	#define BFS_MAGIC 0x1BADFACE
	15	#define BFS_ROOT_INO 2
	16	#define BFS_INODES_PER_BLOCK 8
	17
	18	/* SVR4 vnode type values (bfs_inode->i_vtype) */
fac92bec AS	19	#define BFS_VDIR 2L
	20	#define BFS_VREG 1L
	21
1da177e4 LT	22	/* BFS inode layout on disk */
1da177e4 LT	23	struct bfs_inode {
ce0fe7e7	24	__le16 i_ino;
1da177e4	25	__u16 i_unused;
ce0fe7e7 AD	26	__le32 i_sblock;
	27	__le32 i_eblock;
	28	__le32 i_eoffset;
	29	__le32 i_vtype;
	30	__le32 i_mode;
	31	__le32 i_uid;
	32	__le32 i_gid;
	33	__le32 i_nlink;
	34	__le32 i_atime;
	35	__le32 i_mtime;
	36	__le32 i_ctime;
1da177e4 LT	37	__u32 i_padding[4];
	38	};
	39
	40	#define BFS_NAMELEN 14
	41	#define BFS_DIRENT_SIZE 16
	42	#define BFS_DIRS_PER_BLOCK 32
	43
	44	struct bfs_dirent {
ce0fe7e7	45	__le16 ino;
1da177e4 LT	46	char name[BFS_NAMELEN];
	47	};
	48
	49	/* BFS superblock layout on disk */
	50	struct bfs_super_block {
ce0fe7e7 AD	51	__le32 s_magic;
	52	__le32 s_start;
	53	__le32 s_end;
	54	__le32 s_from;
	55	__le32 s_to;
1da177e4 LT	56	__s32 s_bfrom;
	57	__s32 s_bto;
	58	char s_fsname[6];
	59	char s_volume[6];
	60	__u32 s_padding[118];
	61	};
	62
1da177e4 LT	63
	64	#define BFS_OFF2INO(offset) \
	65	((((offset) - BFS_BSIZE) / sizeof(struct bfs_inode)) + BFS_ROOT_INO)
	66
	67	#define BFS_INO2OFF(ino) \
	68	((__u32)(((ino) - BFS_ROOT_INO) * sizeof(struct bfs_inode)) + BFS_BSIZE)
fac92bec	69	#define BFS_NZFILESIZE(ip) \
ce0fe7e7	70	((le32_to_cpu((ip)->i_eoffset) + 1) - le32_to_cpu((ip)->i_sblock) * BFS_BSIZE)
fac92bec AS	71
	72	#define BFS_FILESIZE(ip) \
	73	((ip)->i_sblock == 0 ? 0 : BFS_NZFILESIZE(ip))
1da177e4	74
fac92bec	75	#define BFS_FILEBLOCKS(ip) \
ce0fe7e7	76	((ip)->i_sblock == 0 ? 0 : (le32_to_cpu((ip)->i_eblock) + 1) - le32_to_cpu((ip)->i_sblock))
1da177e4	77	#define BFS_UNCLEAN(bfs_sb, sb) \
ce0fe7e7	78	((le32_to_cpu(bfs_sb->s_from) != -1) && (le32_to_cpu(bfs_sb->s_to) != -1) && !(sb->s_flags & MS_RDONLY))
fac92bec	79
1da177e4 LT	80
1da177e4 LT	81	#endif /* _LINUX_BFS_FS_H */