1*607ca46eSDavid Howells /* 2*607ca46eSDavid Howells * efs_fs_sb.h 3*607ca46eSDavid Howells * 4*607ca46eSDavid Howells * Copyright (c) 1999 Al Smith 5*607ca46eSDavid Howells * 6*607ca46eSDavid Howells * Portions derived from IRIX header files (c) 1988 Silicon Graphics 7*607ca46eSDavid Howells */ 8*607ca46eSDavid Howells 9*607ca46eSDavid Howells #ifndef __EFS_FS_SB_H__ 10*607ca46eSDavid Howells #define __EFS_FS_SB_H__ 11*607ca46eSDavid Howells 12*607ca46eSDavid Howells #include <linux/types.h> 13*607ca46eSDavid Howells #include <linux/magic.h> 14*607ca46eSDavid Howells 15*607ca46eSDavid Howells /* EFS superblock magic numbers */ 16*607ca46eSDavid Howells #define EFS_MAGIC 0x072959 17*607ca46eSDavid Howells #define EFS_NEWMAGIC 0x07295a 18*607ca46eSDavid Howells 19*607ca46eSDavid Howells #define IS_EFS_MAGIC(x) ((x == EFS_MAGIC) || (x == EFS_NEWMAGIC)) 20*607ca46eSDavid Howells 21*607ca46eSDavid Howells #define EFS_SUPER 1 22*607ca46eSDavid Howells #define EFS_ROOTINODE 2 23*607ca46eSDavid Howells 24*607ca46eSDavid Howells /* efs superblock on disk */ 25*607ca46eSDavid Howells struct efs_super { 26*607ca46eSDavid Howells __be32 fs_size; /* size of filesystem, in sectors */ 27*607ca46eSDavid Howells __be32 fs_firstcg; /* bb offset to first cg */ 28*607ca46eSDavid Howells __be32 fs_cgfsize; /* size of cylinder group in bb's */ 29*607ca46eSDavid Howells __be16 fs_cgisize; /* bb's of inodes per cylinder group */ 30*607ca46eSDavid Howells __be16 fs_sectors; /* sectors per track */ 31*607ca46eSDavid Howells __be16 fs_heads; /* heads per cylinder */ 32*607ca46eSDavid Howells __be16 fs_ncg; /* # of cylinder groups in filesystem */ 33*607ca46eSDavid Howells __be16 fs_dirty; /* fs needs to be fsck'd */ 34*607ca46eSDavid Howells __be32 fs_time; /* last super-block update */ 35*607ca46eSDavid Howells __be32 fs_magic; /* magic number */ 36*607ca46eSDavid Howells char fs_fname[6]; /* file system name */ 37*607ca46eSDavid Howells char fs_fpack[6]; /* file system pack name */ 38*607ca46eSDavid Howells __be32 fs_bmsize; /* size of bitmap in bytes */ 39*607ca46eSDavid Howells __be32 fs_tfree; /* total free data blocks */ 40*607ca46eSDavid Howells __be32 fs_tinode; /* total free inodes */ 41*607ca46eSDavid Howells __be32 fs_bmblock; /* bitmap location. */ 42*607ca46eSDavid Howells __be32 fs_replsb; /* Location of replicated superblock. */ 43*607ca46eSDavid Howells __be32 fs_lastialloc; /* last allocated inode */ 44*607ca46eSDavid Howells char fs_spare[20]; /* space for expansion - MUST BE ZERO */ 45*607ca46eSDavid Howells __be32 fs_checksum; /* checksum of volume portion of fs */ 46*607ca46eSDavid Howells }; 47*607ca46eSDavid Howells 48*607ca46eSDavid Howells /* efs superblock information in memory */ 49*607ca46eSDavid Howells struct efs_sb_info { 50*607ca46eSDavid Howells __u32 fs_magic; /* superblock magic number */ 51*607ca46eSDavid Howells __u32 fs_start; /* first block of filesystem */ 52*607ca46eSDavid Howells __u32 first_block; /* first data block in filesystem */ 53*607ca46eSDavid Howells __u32 total_blocks; /* total number of blocks in filesystem */ 54*607ca46eSDavid Howells __u32 group_size; /* # of blocks a group consists of */ 55*607ca46eSDavid Howells __u32 data_free; /* # of free data blocks */ 56*607ca46eSDavid Howells __u32 inode_free; /* # of free inodes */ 57*607ca46eSDavid Howells __u16 inode_blocks; /* # of blocks used for inodes in every grp */ 58*607ca46eSDavid Howells __u16 total_groups; /* # of groups */ 59*607ca46eSDavid Howells }; 60*607ca46eSDavid Howells 61*607ca46eSDavid Howells #endif /* __EFS_FS_SB_H__ */ 62*607ca46eSDavid Howells 63