2 * modified for EXT2FS support in Lites 1.1
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
8 * linux/include/linux/ext2_fs_sb.h
10 * Copyright (C) 1992, 1993, 1994, 1995
11 * Remy Card (card@masi.ibp.fr)
12 * Laboratoire MASI - Institut Blaise Pascal
13 * Universite Pierre et Marie Curie (Paris VI)
17 * linux/include/linux/minix_fs_sb.h
19 * Copyright (C) 1991, 1992 Linus Torvalds
22 #ifndef _LINUX_EXT2_FS_SB
23 #define _LINUX_EXT2_FS_SB
28 * The following is not needed anymore since the descriptors buffer
29 * heads are now dynamically allocated
31 /* #define EXT2_MAX_GROUP_DESC 8 */
33 #define EXT2_MAX_GROUP_LOADED 8
36 * second extended-fs super-block data in memory
39 unsigned long s_frag_size; /* Size of a fragment in bytes */
40 unsigned long s_frags_per_block;/* Number of fragments per block */
41 unsigned long s_inodes_per_block;/* Number of inodes per block */
42 unsigned long s_frags_per_group;/* Number of fragments in a group */
43 unsigned long s_blocks_per_group;/* Number of blocks in a group */
44 unsigned long s_inodes_per_group;/* Number of inodes in a group */
45 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
46 unsigned long s_db_per_group; /* Number of descriptor blocks per group */
47 unsigned long s_desc_per_block; /* Number of group descriptors per block */
48 unsigned long s_groups_count; /* Number of groups in the fs */
49 struct buf *s_sbh; /* Buffer containing the super block */
50 struct ext2_super_block *s_es; /* Pointer to the super block in the buffer */
51 struct buf **s_group_desc;
52 unsigned short s_loaded_inode_bitmaps;
53 unsigned short s_loaded_block_bitmaps;
54 unsigned long s_inode_bitmap_number[EXT2_MAX_GROUP_LOADED];
55 struct buf *s_inode_bitmap[EXT2_MAX_GROUP_LOADED];
56 unsigned long s_block_bitmap_number[EXT2_MAX_GROUP_LOADED];
57 struct buf *s_block_bitmap[EXT2_MAX_GROUP_LOADED];
59 unsigned long s_mount_opt;
61 unsigned short s_resuid;
62 unsigned short s_resgid;
64 unsigned short s_inode_size;
65 unsigned int s_first_ino;
66 unsigned short s_mount_state;
68 stuff that FFS keeps in its super block or that linux
69 has in its non-ext2 specific super block and which is
70 generally considered useful
72 unsigned long s_blocksize;
73 unsigned long s_blocksize_bits;
74 unsigned int s_bshift; /* = log2(s_blocksize) */
75 quad_t s_qbmask; /* = s_blocksize - 1 */
76 unsigned int s_fsbtodb; /* shift to get disk block */
77 char s_rd_only; /* read-only */
78 char s_dirt; /* fs modified flag */
79 char s_wasvalid; /* valid at mount time */
81 char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
84 #endif /* _LINUX_EXT2_FS_SB */