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linux
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efs_fs_sb.h
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/* 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__ */