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#include <linux/types.h>
13#include <linux/magic.h>
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 */
25struct efs_super {
26	__be32		fs_size;        /* size of filesystem, in sectors */
27	__be32		fs_firstcg;     /* bb offset to first cg */
28	__be32		fs_cgfsize;     /* size of cylinder group in bb's */
29	__be16		fs_cgisize;     /* bb's of inodes per cylinder group */
30	__be16		fs_sectors;     /* sectors per track */
31	__be16		fs_heads;       /* heads per cylinder */
32	__be16		fs_ncg;         /* # of cylinder groups in filesystem */
33	__be16		fs_dirty;       /* fs needs to be fsck'd */
34	__be32		fs_time;        /* last super-block update */
35	__be32		fs_magic;       /* magic number */
36	char		fs_fname[6];    /* file system name */
37	char		fs_fpack[6];    /* file system pack name */
38	__be32		fs_bmsize;      /* size of bitmap in bytes */
39	__be32		fs_tfree;       /* total free data blocks */
40	__be32		fs_tinode;      /* total free inodes */
41	__be32		fs_bmblock;     /* bitmap location. */
42	__be32		fs_replsb;      /* Location of replicated superblock. */
43	__be32		fs_lastialloc;  /* last allocated inode */
44	char		fs_spare[20];   /* space for expansion - MUST BE ZERO */
45	__be32		fs_checksum;    /* checksum of volume portion of fs */
46};
47
48/* efs superblock information in memory */
49struct efs_sb_info {
50	__u32	fs_magic;	/* superblock magic number */
51	__u32	fs_start;	/* first block of filesystem */
52	__u32	first_block;	/* first data block in filesystem */
53	__u32	total_blocks;	/* total number of blocks in filesystem */
54	__u32	group_size;	/* # of blocks a group consists of */
55	__u32	data_free;	/* # of free data blocks */
56	__u32	inode_free;	/* # of free inodes */
57	__u16	inode_blocks;	/* # of blocks used for inodes in every grp */
58	__u16	total_groups;	/* # of groups */
59};
60
61#endif /* __EFS_FS_SB_H__ */
62
63