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The C and C++ Include Header Files

cat -n /usr/include/linux/efs_fs_sb.h

     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