84 lines
2.8 KiB
C
84 lines
2.8 KiB
C
/*
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* modified for EXT2FS support in Lites 1.1
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*
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* Aug 1995, Godmar Back (gback@cs.utah.edu)
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* University of Utah, Department of Computer Science
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*
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* $FreeBSD$
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*/
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/*
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* linux/include/linux/ext2_fs_sb.h
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/include/linux/minix_fs_sb.h
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#ifndef _LINUX_EXT2_FS_SB
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#define _LINUX_EXT2_FS_SB
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/*
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* The following is not needed anymore since the descriptors buffer
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* heads are now dynamically allocated
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*/
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/* #define EXT2_MAX_GROUP_DESC 8 */
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#define EXT2_MAX_GROUP_LOADED 8
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#define buffer_head buf
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#define MAXMNTLEN 512
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/*
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* second extended-fs super-block data in memory
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*/
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struct ext2_sb_info {
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unsigned long s_frag_size; /* Size of a fragment in bytes */
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unsigned long s_frags_per_block;/* Number of fragments per block */
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unsigned long s_inodes_per_block;/* Number of inodes per block */
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unsigned long s_frags_per_group;/* Number of fragments in a group */
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unsigned long s_blocks_per_group;/* Number of blocks in a group */
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unsigned long s_inodes_per_group;/* Number of inodes in a group */
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unsigned long s_itb_per_group; /* Number of inode table blocks per group */
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unsigned long s_db_per_group; /* Number of descriptor blocks per group */
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unsigned long s_desc_per_block; /* Number of group descriptors per block */
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unsigned long s_groups_count; /* Number of groups in the fs */
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struct buffer_head * s_sbh; /* Buffer containing the super block */
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struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */
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struct buffer_head ** s_group_desc;
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unsigned short s_loaded_inode_bitmaps;
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unsigned short s_loaded_block_bitmaps;
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unsigned long s_inode_bitmap_number[EXT2_MAX_GROUP_LOADED];
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struct buffer_head * s_inode_bitmap[EXT2_MAX_GROUP_LOADED];
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unsigned long s_block_bitmap_number[EXT2_MAX_GROUP_LOADED];
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struct buffer_head * s_block_bitmap[EXT2_MAX_GROUP_LOADED];
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int s_rename_lock;
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unsigned long s_mount_opt;
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unsigned short s_resuid;
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unsigned short s_resgid;
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unsigned short s_mount_state;
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/*
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stuff that FFS keeps in its super block or that linux
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has in its non-ext2 specific super block and which is
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generally considered useful
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*/
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unsigned long s_blocksize;
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unsigned long s_blocksize_bits;
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unsigned int s_bshift; /* = log2(s_blocksize) */
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quad_t s_qbmask; /* = s_blocksize - 1 */
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unsigned int s_fsbtodb; /* shift to get disk block */
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char s_rd_only; /* read-only */
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char s_dirt; /* fs modified flag */
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char s_wasvalid; /* valid at mount time */
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off_t fs_maxfilesize;
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char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
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};
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#endif /* _LINUX_EXT2_FS_SB */
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