1 /*
2  * efs_fs_sb.h
3  *
4  * Copyright (c) 1999 Al Smith
5  *
6  * Portions derived from IRIX header files (c) 1988 Silicon Graphics
7  */
8 
9 #ifndef __EFS_FS_SB_H__
10 #define __EFS_FS_SB_H__
11 
12 /* statfs() magic number for EFS */
13 #define EFS_SUPER_MAGIC	0x414A53
14 
15 /* EFS superblock magic numbers */
16 #define EFS_MAGIC	0x072959
17 #define EFS_NEWMAGIC	0x07295a
18 
19 #define IS_EFS_MAGIC(x)	((x == EFS_MAGIC) || (x == EFS_NEWMAGIC))
20 
21 #define EFS_SUPER		1
22 #define EFS_ROOTINODE		2
23 
24 /* efs superblock on disk */
25 struct efs_super {
26 	int32_t		fs_size;        /* size of filesystem, in sectors */
27 	int32_t		fs_firstcg;     /* bb offset to first cg */
28 	int32_t		fs_cgfsize;     /* size of cylinder group in bb's */
29 	short		fs_cgisize;     /* bb's of inodes per cylinder group */
30 	short		fs_sectors;     /* sectors per track */
31 	short		fs_heads;       /* heads per cylinder */
32 	short		fs_ncg;         /* # of cylinder groups in filesystem */
33 	short		fs_dirty;       /* fs needs to be fsck'd */
34 	int32_t		fs_time;        /* last super-block update */
35 	int32_t		fs_magic;       /* magic number */
36 	char		fs_fname[6];    /* file system name */
37 	char		fs_fpack[6];    /* file system pack name */
38 	int32_t		fs_bmsize;      /* size of bitmap in bytes */
39 	int32_t		fs_tfree;       /* total free data blocks */
40 	int32_t		fs_tinode;      /* total free inodes */
41 	int32_t		fs_bmblock;     /* bitmap location. */
42 	int32_t		fs_replsb;      /* Location of replicated superblock. */
43 	int32_t		fs_lastialloc;  /* last allocated inode */
44 	char		fs_spare[20];   /* space for expansion - MUST BE ZERO */
45 	int32_t		fs_checksum;    /* checksum of volume portion of fs */
46 };
47 
48 /* efs superblock information in memory */
49 struct efs_sb_info {
50 	int32_t	fs_magic;	/* superblock magic number */
51 	int32_t	fs_start;	/* first block of filesystem */
52 	int32_t	first_block;	/* first data block in filesystem */
53 	int32_t	total_blocks;	/* total number of blocks in filesystem */
54 	int32_t	group_size;	/* # of blocks a group consists of */
55 	int32_t	data_free;	/* # of free data blocks */
56 	int32_t	inode_free;	/* # of free inodes */
57 	short	inode_blocks;	/* # of blocks used for inodes in every grp */
58 	short	total_groups;	/* # of groups */
59 };
60 
61 #endif /* __EFS_FS_SB_H__ */
62 
63