ext2_fs_sb.h

LINUX1.0内核源代码,学习LINUX编程的一定要看。

/*
 *  linux/include/linux/ext2_fs_sb.h
 *
 *  Copyright (C) 1992, 1993, 1994  Remy Card ([e-mail])
 *                                  Laboratoire MASI - Institut Blaise Pascal
 *                                  Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/include/linux/minix_fs_sb.h
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

#ifndef _LINUX_EXT2_FS_SB
#define _LINUX_EXT2_FS_SB

#define EXT2_MAX_GROUP_DESC	8
#define EXT2_MAX_GROUP_LOADED	8

/*
 * second extended-fs super-block data in memory
 */
struct ext2_sb_info {
	unsigned long s_frag_size;	/* Size of a fragment in bytes */
	unsigned long s_frags_per_block;/* Number of fragments per block */
	unsigned long s_inodes_per_block;/* Number of inodes per block */
	unsigned long s_frags_per_group;/* Number of fragments in a group */
	unsigned long s_blocks_per_group;/* Number of blocks in a group */
	unsigned long s_inodes_per_group;/* Number of inodes in a group */
	unsigned long s_itb_per_group;	/* Number of inode table blocks per group */
	unsigned long s_desc_per_block;	/* Number of group descriptors per block */
	unsigned long s_groups_count;	/* Number of groups in the fs */
	struct buffer_head * s_sbh;	/* Buffer containing the super block */
	struct ext2_super_block * s_es;	/* Pointer to the super block in the buffer */
	struct buffer_head * s_group_desc[EXT2_MAX_GROUP_DESC];
	unsigned short s_loaded_inode_bitmaps;
	unsigned short s_loaded_block_bitmaps;
	unsigned long s_inode_bitmap_number[EXT2_MAX_GROUP_LOADED];
	struct buffer_head * s_inode_bitmap[EXT2_MAX_GROUP_LOADED];
	unsigned long s_block_bitmap_number[EXT2_MAX_GROUP_LOADED];
	struct buffer_head * s_block_bitmap[EXT2_MAX_GROUP_LOADED];
	int s_rename_lock;
	struct wait_queue * s_rename_wait;
	unsigned long  s_mount_opt;
	unsigned short s_mount_state;
};

#endif	/* _LINUX_EXT2_FS_SB */