root/include/linux/ext2_fs_sb.h

INCLUDED FROM

/*
 *  linux/include/linux/ext2_fs_sb.h
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/include/linux/minix_fs_sb.h
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

#ifndef _LINUX_EXT2_FS_SB
#define _LINUX_EXT2_FS_SB

#include <linux/blockgroup_lock.h>
#include <linux/percpu_counter.h>
#include <linux/rbtree.h>

/* XXX Here for now... not interested in restructing headers JUST now */

/* data type for block offset of block group */
typedef int ext2_grpblk_t;

/* data type for filesystem-wide blocks number */
typedef unsigned long ext2_fsblk_t;

#define E2FSBLK "%lu"

struct ext2_reserve_window {
        ext2_fsblk_t            _rsv_start;     /* First byte reserved */
        ext2_fsblk_t            _rsv_end;       /* Last byte reserved or 0 */
};

struct ext2_reserve_window_node {
        struct rb_node          rsv_node;
        __u32                   rsv_goal_size;
        __u32                   rsv_alloc_hit;
        struct ext2_reserve_window      rsv_window;
};

struct ext2_block_alloc_info {
        /* information about reservation window */
        struct ext2_reserve_window_node rsv_window_node;
        /*
         * was i_next_alloc_block in ext2_inode_info
         * is the logical (file-relative) number of the
         * most-recently-allocated block in this file.
         * We use this for detecting linearly ascending allocation requests.
         */
        __u32                   last_alloc_logical_block;
        /*
         * Was i_next_alloc_goal in ext2_inode_info
         * is the *physical* companion to i_next_alloc_block.
         * it the the physical block number of the block which was most-recentl
         * allocated to this file.  This give us the goal (target) for the next
         * allocation when we detect linearly ascending requests.
         */
        ext2_fsblk_t            last_alloc_physical_block;
};

#define rsv_start rsv_window._rsv_start
#define rsv_end rsv_window._rsv_end

/*
 * second extended-fs super-block data in memory
 */
struct ext2_sb_info {
        unsigned long s_frag_size;      /* Size of a fragment in bytes */
        unsigned long s_frags_per_block;/* Number of fragments per block */
        unsigned long s_inodes_per_block;/* Number of inodes per block */
        unsigned long s_frags_per_group;/* Number of fragments in a group */
        unsigned long s_blocks_per_group;/* Number of blocks in a group */
        unsigned long s_inodes_per_group;/* Number of inodes in a group */
        unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
        unsigned long s_gdb_count;      /* Number of group descriptor blocks */
        unsigned long s_desc_per_block; /* Number of group descriptors per block */
        unsigned long s_groups_count;   /* Number of groups in the fs */
        unsigned long s_overhead_last;  /* Last calculated overhead */
        unsigned long s_blocks_last;    /* Last seen block count */
        struct buffer_head * s_sbh;     /* Buffer containing the super block */
        struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */
        struct buffer_head ** s_group_desc;
        unsigned long  s_mount_opt;
        unsigned long s_sb_block;
        uid_t s_resuid;
        gid_t s_resgid;
        unsigned short s_mount_state;
        unsigned short s_pad;
        int s_addr_per_block_bits;
        int s_desc_per_block_bits;
        int s_inode_size;
        int s_first_ino;
        spinlock_t s_next_gen_lock;
        u32 s_next_generation;
        unsigned long s_dir_count;
        u8 *s_debts;
        struct percpu_counter s_freeblocks_counter;
        struct percpu_counter s_freeinodes_counter;
        struct percpu_counter s_dirs_counter;
        struct blockgroup_lock s_blockgroup_lock;
        /* root of the per fs reservation window tree */
        spinlock_t s_rsv_window_lock;
        struct rb_root s_rsv_window_root;
        struct ext2_reserve_window_node s_rsv_window_head;
};

#endif  /* _LINUX_EXT2_FS_SB */