1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
 2/*
 3 * efs_fs_sb.h
 4 *
 5 * Copyright (c) 1999 Al Smith
 6 *
 7 * Portions derived from IRIX header files (c) 1988 Silicon Graphics
 8 */
 9
10#ifndef __EFS_FS_SB_H__
11#define __EFS_FS_SB_H__
12
13#include <linux/types.h>
14#include <linux/magic.h>
15
16/* EFS superblock magic numbers */
17#define EFS_MAGIC	0x072959
18#define EFS_NEWMAGIC	0x07295a
19
20#define IS_EFS_MAGIC(x)	((x == EFS_MAGIC) || (x == EFS_NEWMAGIC))
21
22#define EFS_SUPER		1
23#define EFS_ROOTINODE		2
24
25/* efs superblock on disk */
26struct efs_super {
27	__be32		fs_size;        /* size of filesystem, in sectors */
28	__be32		fs_firstcg;     /* bb offset to first cg */
29	__be32		fs_cgfsize;     /* size of cylinder group in bb's */
30	__be16		fs_cgisize;     /* bb's of inodes per cylinder group */
31	__be16		fs_sectors;     /* sectors per track */
32	__be16		fs_heads;       /* heads per cylinder */
33	__be16		fs_ncg;         /* # of cylinder groups in filesystem */
34	__be16		fs_dirty;       /* fs needs to be fsck'd */
35	__be32		fs_time;        /* last super-block update */
36	__be32		fs_magic;       /* magic number */
37	char		fs_fname[6];    /* file system name */
38	char		fs_fpack[6];    /* file system pack name */
39	__be32		fs_bmsize;      /* size of bitmap in bytes */
40	__be32		fs_tfree;       /* total free data blocks */
41	__be32		fs_tinode;      /* total free inodes */
42	__be32		fs_bmblock;     /* bitmap location. */
43	__be32		fs_replsb;      /* Location of replicated superblock. */
44	__be32		fs_lastialloc;  /* last allocated inode */
45	char		fs_spare[20];   /* space for expansion - MUST BE ZERO */
46	__be32		fs_checksum;    /* checksum of volume portion of fs */
47};
48
49/* efs superblock information in memory */
50struct efs_sb_info {
51	__u32	fs_magic;	/* superblock magic number */
52	__u32	fs_start;	/* first block of filesystem */
53	__u32	first_block;	/* first data block in filesystem */
54	__u32	total_blocks;	/* total number of blocks in filesystem */
55	__u32	group_size;	/* # of blocks a group consists of */ 
56	__u32	data_free;	/* # of free data blocks */
57	__u32	inode_free;	/* # of free inodes */
58	__u16	inode_blocks;	/* # of blocks used for inodes in every grp */
59	__u16	total_groups;	/* # of groups */
60};
61
62#endif /* __EFS_FS_SB_H__ */