include/linux/ext2_fs_sb.h

   1 /*
   2  *  linux/include/linux/ext2_fs_sb.h
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/include/linux/minix_fs_sb.h
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  */
  15
  16 #ifndef _LINUX_EXT2_FS_SB
  17 #define _LINUX_EXT2_FS_SB
  18
  19 /*
  20  * The following is not needed anymore since the descriptors buffer
  21  * heads are now dynamically allocated
  22  */
  23 /* #define EXT2_MAX_GROUP_DESC  8 */
  24
  25 #define EXT2_MAX_GROUP_LOADED   8
  26
  27 /*
  28  * second extended-fs super-block data in memory
  29  */
  30 struct ext2_sb_info {
  31         unsigned long s_frag_size;      /* Size of a fragment in bytes */
  32         unsigned long s_frags_per_block;/* Number of fragments per block */
  33         unsigned long s_inodes_per_block;/* Number of inodes per block */
  34         unsigned long s_frags_per_group;/* Number of fragments in a group */
  35         unsigned long s_blocks_per_group;/* Number of blocks in a group */
  36         unsigned long s_inodes_per_group;/* Number of inodes in a group */
  37         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
  38         unsigned long s_db_per_group;   /* Number of descriptor blocks per group */
  39         unsigned long s_desc_per_block; /* Number of group descriptors per block */
  40         unsigned long s_groups_count;   /* Number of groups in the fs */
  41         struct buffer_head * s_sbh;     /* Buffer containing the super block */
  42         struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */
  43         struct buffer_head ** s_group_desc;
  44         unsigned short s_loaded_inode_bitmaps;
  45         unsigned short s_loaded_block_bitmaps;
  46         unsigned long s_inode_bitmap_number[EXT2_MAX_GROUP_LOADED];
  47         struct buffer_head * s_inode_bitmap[EXT2_MAX_GROUP_LOADED];
  48         unsigned long s_block_bitmap_number[EXT2_MAX_GROUP_LOADED];
  49         struct buffer_head * s_block_bitmap[EXT2_MAX_GROUP_LOADED];
  50         unsigned long  s_mount_opt;
  51         uid_t s_resuid;
  52         gid_t s_resgid;
  53         unsigned short s_mount_state;
  54         unsigned short s_pad;
  55         int s_addr_per_block_bits;
  56         int s_desc_per_block_bits;
  57         int s_inode_size;
  58         int s_first_ino;
  59         int s_feature_compat;
  60         int s_feature_incompat;
  61         int s_feature_ro_compat;
  62 };
  63
  64 #endif  /* _LINUX_EXT2_FS_SB */