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