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