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/*

 *  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 */