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/*

 *  linux/include/linux/ext4_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_EXT4_FS_SB

#define _LINUX_EXT4_FS_SB

#ifdef __KERNEL__

#include <linux/timer.h>

#include <linux/wait.h>

#include <linux/blockgroup_lock.h>

#include <linux/percpu_counter.h>

#endif

#include <linux/rbtree.h>

/*

 * third extended-fs super-block data in memory

 */

struct ext4_sb_info {

        unsigned long s_desc_size;      /* Size of a group descriptor in bytes */

        unsigned long s_inodes_per_block;/* Number of inodes per block */

        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 ext4_super_block * s_es; /* Pointer to the super block in the buffer */

        struct buffer_head ** s_group_desc;

        unsigned long  s_mount_opt;

        ext4_fsblk_t 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;

        u32 s_hash_seed[4];

        int s_def_hash_version;

        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 ext4_reserve_window_node s_rsv_window_head;

        /* Journaling */

        struct inode * s_journal_inode;

        struct journal_s * s_journal;

        struct list_head s_orphan;

        unsigned long s_commit_interval;

        struct block_device *journal_bdev;

#ifdef CONFIG_JBD2_DEBUG

        struct timer_list turn_ro_timer;        /* For turning read-only (crash simulation) */

        wait_queue_head_t ro_wait_queue;        /* For people waiting for the fs to go read-only */

#endif

#ifdef CONFIG_QUOTA

        char *s_qf_names[MAXQUOTAS];            /* Names of quota files with journalled quota */

        int s_jquota_fmt;                       /* Format of quota to use */

#endif

        unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */

#ifdef EXTENTS_STATS

        /* ext4 extents stats */

        unsigned long s_ext_min;

        unsigned long s_ext_max;

        unsigned long s_depth_max;

        spinlock_t s_ext_stats_lock;

        unsigned long s_ext_blocks;

        unsigned long s_ext_extents;

#endif

};

#endif  /* _LINUX_EXT4_FS_SB */