efs_fs_sb.h
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上传日期：2013-04-10
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- /*
- * 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__
- /* statfs() magic number for EFS */
- #define EFS_SUPER_MAGIC 0x414A53
- /* 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 {
- int32_t fs_size; /* size of filesystem, in sectors */
- int32_t fs_firstcg; /* bb offset to first cg */
- int32_t fs_cgfsize; /* size of cylinder group in bb's */
- short fs_cgisize; /* bb's of inodes per cylinder group */
- short fs_sectors; /* sectors per track */
- short fs_heads; /* heads per cylinder */
- short fs_ncg; /* # of cylinder groups in filesystem */
- short fs_dirty; /* fs needs to be fsck'd */
- int32_t fs_time; /* last super-block update */
- int32_t fs_magic; /* magic number */
- char fs_fname[6]; /* file system name */
- char fs_fpack[6]; /* file system pack name */
- int32_t fs_bmsize; /* size of bitmap in bytes */
- int32_t fs_tfree; /* total free data blocks */
- int32_t fs_tinode; /* total free inodes */
- int32_t fs_bmblock; /* bitmap location. */
- int32_t fs_replsb; /* Location of replicated superblock. */
- int32_t fs_lastialloc; /* last allocated inode */
- char fs_spare[20]; /* space for expansion - MUST BE ZERO */
- int32_t fs_checksum; /* checksum of volume portion of fs */
- };
- /* efs superblock information in memory */
- struct efs_sb_info {
- int32_t fs_magic; /* superblock magic number */
- int32_t fs_start; /* first block of filesystem */
- int32_t first_block; /* first data block in filesystem */
- int32_t total_blocks; /* total number of blocks in filesystem */
- int32_t group_size; /* # of blocks a group consists of */
- int32_t data_free; /* # of free data blocks */
- int32_t inode_free; /* # of free inodes */
- short inode_blocks; /* # of blocks used for inodes in every grp */
- short total_groups; /* # of groups */
- };
- #endif /* __EFS_FS_SB_H__ */
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