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| Dir : //usr/include/linux/efs_fs_sb.h |
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* efs_fs_sb.h
*
* Copyright (c) 1999 Al Smith
*
* Portions derived from IRIX header files (c) 1988 Silicon Graphics
*/
#ifndef __EFS_FS_SB_H__
#define __EFS_FS_SB_H__
#include <linux/types.h>
#include <linux/magic.h>
/* EFS superblock magic numbers */
#define EFS_MAGIC 0x072959
#define EFS_NEWMAGIC 0x07295a
#define IS_EFS_MAGIC(x) ((x == EFS_MAGIC) || (x == EFS_NEWMAGIC))
#define EFS_SUPER 1
#define EFS_ROOTINODE 2
/* efs superblock on disk */
struct efs_super {
__be32 fs_size; /* size of filesystem, in sectors */
__be32 fs_firstcg; /* bb offset to first cg */
__be32 fs_cgfsize; /* size of cylinder group in bb's */
__be16 fs_cgisize; /* bb's of inodes per cylinder group */
__be16 fs_sectors; /* sectors per track */
__be16 fs_heads; /* heads per cylinder */
__be16 fs_ncg; /* # of cylinder groups in filesystem */
__be16 fs_dirty; /* fs needs to be fsck'd */
__be32 fs_time; /* last super-block update */
__be32 fs_magic; /* magic number */
char fs_fname[6]; /* file system name */
char fs_fpack[6]; /* file system pack name */
__be32 fs_bmsize; /* size of bitmap in bytes */
__be32 fs_tfree; /* total free data blocks */
__be32 fs_tinode; /* total free inodes */
__be32 fs_bmblock; /* bitmap location. */
__be32 fs_replsb; /* Location of replicated superblock. */
__be32 fs_lastialloc; /* last allocated inode */
char fs_spare[20]; /* space for expansion - MUST BE ZERO */
__be32 fs_checksum; /* checksum of volume portion of fs */
};
/* efs superblock information in memory */
struct efs_sb_info {
__u32 fs_magic; /* superblock magic number */
__u32 fs_start; /* first block of filesystem */
__u32 first_block; /* first data block in filesystem */
__u32 total_blocks; /* total number of blocks in filesystem */
__u32 group_size; /* # of blocks a group consists of */
__u32 data_free; /* # of free data blocks */
__u32 inode_free; /* # of free inodes */
__u16 inode_blocks; /* # of blocks used for inodes in every grp */
__u16 total_groups; /* # of groups */
};
#endif /* __EFS_FS_SB_H__ */