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 */
26 struct 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 */
50 struct 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__ */
63 
64