1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * efs_fs_sb.h 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (c) 1999 Al Smith 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * Portions derived from IRIX header files (c) 1988 Silicon Graphics 8*4882a593Smuzhiyun */ 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #ifndef __EFS_FS_SB_H__ 11*4882a593Smuzhiyun #define __EFS_FS_SB_H__ 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun #include <linux/types.h> 14*4882a593Smuzhiyun #include <linux/magic.h> 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun /* EFS superblock magic numbers */ 17*4882a593Smuzhiyun #define EFS_MAGIC 0x072959 18*4882a593Smuzhiyun #define EFS_NEWMAGIC 0x07295a 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun #define IS_EFS_MAGIC(x) ((x == EFS_MAGIC) || (x == EFS_NEWMAGIC)) 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun #define EFS_SUPER 1 23*4882a593Smuzhiyun #define EFS_ROOTINODE 2 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun /* efs superblock on disk */ 26*4882a593Smuzhiyun struct efs_super { 27*4882a593Smuzhiyun __be32 fs_size; /* size of filesystem, in sectors */ 28*4882a593Smuzhiyun __be32 fs_firstcg; /* bb offset to first cg */ 29*4882a593Smuzhiyun __be32 fs_cgfsize; /* size of cylinder group in bb's */ 30*4882a593Smuzhiyun __be16 fs_cgisize; /* bb's of inodes per cylinder group */ 31*4882a593Smuzhiyun __be16 fs_sectors; /* sectors per track */ 32*4882a593Smuzhiyun __be16 fs_heads; /* heads per cylinder */ 33*4882a593Smuzhiyun __be16 fs_ncg; /* # of cylinder groups in filesystem */ 34*4882a593Smuzhiyun __be16 fs_dirty; /* fs needs to be fsck'd */ 35*4882a593Smuzhiyun __be32 fs_time; /* last super-block update */ 36*4882a593Smuzhiyun __be32 fs_magic; /* magic number */ 37*4882a593Smuzhiyun char fs_fname[6]; /* file system name */ 38*4882a593Smuzhiyun char fs_fpack[6]; /* file system pack name */ 39*4882a593Smuzhiyun __be32 fs_bmsize; /* size of bitmap in bytes */ 40*4882a593Smuzhiyun __be32 fs_tfree; /* total free data blocks */ 41*4882a593Smuzhiyun __be32 fs_tinode; /* total free inodes */ 42*4882a593Smuzhiyun __be32 fs_bmblock; /* bitmap location. */ 43*4882a593Smuzhiyun __be32 fs_replsb; /* Location of replicated superblock. */ 44*4882a593Smuzhiyun __be32 fs_lastialloc; /* last allocated inode */ 45*4882a593Smuzhiyun char fs_spare[20]; /* space for expansion - MUST BE ZERO */ 46*4882a593Smuzhiyun __be32 fs_checksum; /* checksum of volume portion of fs */ 47*4882a593Smuzhiyun }; 48*4882a593Smuzhiyun 49*4882a593Smuzhiyun /* efs superblock information in memory */ 50*4882a593Smuzhiyun struct efs_sb_info { 51*4882a593Smuzhiyun __u32 fs_magic; /* superblock magic number */ 52*4882a593Smuzhiyun __u32 fs_start; /* first block of filesystem */ 53*4882a593Smuzhiyun __u32 first_block; /* first data block in filesystem */ 54*4882a593Smuzhiyun __u32 total_blocks; /* total number of blocks in filesystem */ 55*4882a593Smuzhiyun __u32 group_size; /* # of blocks a group consists of */ 56*4882a593Smuzhiyun __u32 data_free; /* # of free data blocks */ 57*4882a593Smuzhiyun __u32 inode_free; /* # of free inodes */ 58*4882a593Smuzhiyun __u16 inode_blocks; /* # of blocks used for inodes in every grp */ 59*4882a593Smuzhiyun __u16 total_groups; /* # of groups */ 60*4882a593Smuzhiyun }; 61*4882a593Smuzhiyun 62*4882a593Smuzhiyun #endif /* __EFS_FS_SB_H__ */ 63*4882a593Smuzhiyun 64