sys/vfs/gnu/ext2fs/ext2_fs_sb.h

   1 /*
   2  *  modified for EXT2FS support in Lites 1.1
   3  *
   4  *  Aug 1995, Godmar Back (gback@cs.utah.edu)
   5  *  University of Utah, Department of Computer Science
   6  */
   7 /*
   8  *  linux/include/linux/ext2_fs_sb.h
   9  *
  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)
  14  *
  15  *  from
  16  *
  17  *  linux/include/linux/minix_fs_sb.h
  18  *
  19  *  Copyright (C) 1991, 1992  Linus Torvalds
  20  */
  21
  22 #ifndef _LINUX_EXT2_FS_SB
  23 #define _LINUX_EXT2_FS_SB
  24
  25 /*
  26  * The following is not needed anymore since the descriptors buffer
  27  * heads are now dynamically allocated
  28  */
  29 /* #define EXT2_MAX_GROUP_DESC  8 */
  30
  31 #define EXT2_MAX_GROUP_LOADED   8
  32
  33 #define buffer_head buf
  34 #define MAXMNTLEN       512
  35
  36 /*
  37  * second extended-fs super-block data in memory
  38  */
  39 struct ext2_sb_info {
  40         unsigned long s_frag_size;      /* Size of a fragment in bytes */
  41         unsigned long s_frags_per_block;/* Number of fragments per block */
  42         unsigned long s_inodes_per_block;/* Number of inodes per block */
  43         unsigned long s_frags_per_group;/* Number of fragments in a group */
  44         unsigned long s_blocks_per_group;/* Number of blocks in a group */
  45         unsigned long s_inodes_per_group;/* Number of inodes in a group */
  46         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
  47         unsigned long s_db_per_group;   /* Number of descriptor blocks per group */
  48         unsigned long s_desc_per_block; /* Number of group descriptors per block */
  49         unsigned long s_groups_count;   /* Number of groups in the fs */
  50         struct buffer_head * s_sbh;     /* Buffer containing the super block */
  51         struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */
  52         struct buffer_head ** s_group_desc;
  53         unsigned short s_loaded_inode_bitmaps;
  54         unsigned short s_loaded_block_bitmaps;
  55         unsigned long s_inode_bitmap_number[EXT2_MAX_GROUP_LOADED];
  56         struct buffer_head * s_inode_bitmap[EXT2_MAX_GROUP_LOADED];
  57         unsigned long s_block_bitmap_number[EXT2_MAX_GROUP_LOADED];
  58         struct buffer_head * s_block_bitmap[EXT2_MAX_GROUP_LOADED];
  59         int s_rename_lock;
  60         unsigned long  s_mount_opt;
  61 #ifdef notyet
  62         unsigned short s_resuid;
  63         unsigned short s_resgid;
  64 #endif
  65     unsigned short s_inode_size;
  66     unsigned int s_first_ino;
  67         unsigned short s_mount_state;
  68         /*
  69            stuff that FFS keeps in its super block or that linux
  70            has in its non-ext2 specific super block and which is
  71            generally considered useful
  72         */
  73         unsigned long s_blocksize;
  74         unsigned long s_blocksize_bits;
  75         unsigned int  s_bshift;                 /* = log2(s_blocksize) */
  76         quad_t   s_qbmask;                      /* = s_blocksize - 1 */
  77         unsigned int  s_fsbtodb;                /* shift to get disk block */
  78         char    s_rd_only;                      /* read-only            */
  79         char    s_dirt;                         /* fs modified flag */
  80         char    s_wasvalid;                     /* valid at mount time */
  81
  82         char    fs_fsmnt[MAXMNTLEN];            /* name mounted on */
  83 };
  84
  85 #endif  /* _LINUX_EXT2_FS_SB */