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      1 /*
      2  * efs_fs_sb.h
      3  *
      4  * Copyright (c) 1999 Al Smith
      5  *
      6  * Portions derived from IRIX header files (c) 1988 Silicon Graphics
      7  */
      8 
      9 #ifndef __EFS_FS_SB_H__
     10 #define __EFS_FS_SB_H__
     11 
     12 /* statfs() magic number for EFS */
     13 #define EFS_SUPER_MAGIC	0x414A53
     14 
     15 /* EFS superblock magic numbers */
     16 #define EFS_MAGIC	0x072959
     17 #define EFS_NEWMAGIC	0x07295a
     18 
     19 #define IS_EFS_MAGIC(x)	((x == EFS_MAGIC) || (x == EFS_NEWMAGIC))
     20 
     21 #define EFS_SUPER		1
     22 #define EFS_ROOTINODE		2
     23 
     24 /* efs superblock on disk */
     25 struct efs_super {
     26 	__be32		fs_size;        /* size of filesystem, in sectors */
     27 	__be32		fs_firstcg;     /* bb offset to first cg */
     28 	__be32		fs_cgfsize;     /* size of cylinder group in bb's */
     29 	__be16		fs_cgisize;     /* bb's of inodes per cylinder group */
     30 	__be16		fs_sectors;     /* sectors per track */
     31 	__be16		fs_heads;       /* heads per cylinder */
     32 	__be16		fs_ncg;         /* # of cylinder groups in filesystem */
     33 	__be16		fs_dirty;       /* fs needs to be fsck'd */
     34 	__be32		fs_time;        /* last super-block update */
     35 	__be32		fs_magic;       /* magic number */
     36 	char		fs_fname[6];    /* file system name */
     37 	char		fs_fpack[6];    /* file system pack name */
     38 	__be32		fs_bmsize;      /* size of bitmap in bytes */
     39 	__be32		fs_tfree;       /* total free data blocks */
     40 	__be32		fs_tinode;      /* total free inodes */
     41 	__be32		fs_bmblock;     /* bitmap location. */
     42 	__be32		fs_replsb;      /* Location of replicated superblock. */
     43 	__be32		fs_lastialloc;  /* last allocated inode */
     44 	char		fs_spare[20];   /* space for expansion - MUST BE ZERO */
     45 	__be32		fs_checksum;    /* checksum of volume portion of fs */
     46 };
     47 
     48 /* efs superblock information in memory */
     49 struct efs_sb_info {
     50 	__u32	fs_magic;	/* superblock magic number */
     51 	__u32	fs_start;	/* first block of filesystem */
     52 	__u32	first_block;	/* first data block in filesystem */
     53 	__u32	total_blocks;	/* total number of blocks in filesystem */
     54 	__u32	group_size;	/* # of blocks a group consists of */
     55 	__u32	data_free;	/* # of free data blocks */
     56 	__u32	inode_free;	/* # of free inodes */
     57 	__u16	inode_blocks;	/* # of blocks used for inodes in every grp */
     58 	__u16	total_groups;	/* # of groups */
     59 };
     60 
     61 #endif /* __EFS_FS_SB_H__ */
     62 
     63