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 #include <linux/types.h> 13 #include <linux/magic.h> 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
