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18e776a6c1
mainly to get control over new features. E.g., ext2fs filesystems may now have a type field in directory entries (like ufs has had for 20 years or so). Current versions of FreeBSD ext2fs panic on this. ext2fs filesystem code is supposed to check the feature flags in the superblock and take appropriate actions for unsupported features. The other new features are sparse superblocks, large file support, and btree'd directories.
81 lines
2.7 KiB
C
81 lines
2.7 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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/*
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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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char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
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};
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#endif /* _LINUX_EXT2_FS_SB */
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