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[/] [test_project/] [trunk/] [linux_sd_driver/] [include/] [linux/] [ext2_fs_sb.h] - Blame information for rev 81

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1 62 marcus.erl
/*
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 *  linux/include/linux/ext2_fs_sb.h
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 *
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 * Copyright (C) 1992, 1993, 1994, 1995
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 * Remy Card (card@masi.ibp.fr)
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 * Laboratoire MASI - Institut Blaise Pascal
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 * Universite Pierre et Marie Curie (Paris VI)
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 *
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 *  from
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 *
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 *  linux/include/linux/minix_fs_sb.h
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 *
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 *  Copyright (C) 1991, 1992  Linus Torvalds
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 */
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#ifndef _LINUX_EXT2_FS_SB
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#define _LINUX_EXT2_FS_SB
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#include <linux/blockgroup_lock.h>
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#include <linux/percpu_counter.h>
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#include <linux/rbtree.h>
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/* XXX Here for now... not interested in restructing headers JUST now */
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/* data type for block offset of block group */
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typedef int ext2_grpblk_t;
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/* data type for filesystem-wide blocks number */
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typedef unsigned long ext2_fsblk_t;
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#define E2FSBLK "%lu"
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struct ext2_reserve_window {
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        ext2_fsblk_t            _rsv_start;     /* First byte reserved */
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        ext2_fsblk_t            _rsv_end;       /* Last byte reserved or 0 */
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};
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struct ext2_reserve_window_node {
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        struct rb_node          rsv_node;
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        __u32                   rsv_goal_size;
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        __u32                   rsv_alloc_hit;
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        struct ext2_reserve_window      rsv_window;
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};
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struct ext2_block_alloc_info {
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        /* information about reservation window */
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        struct ext2_reserve_window_node rsv_window_node;
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        /*
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         * was i_next_alloc_block in ext2_inode_info
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         * is the logical (file-relative) number of the
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         * most-recently-allocated block in this file.
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         * We use this for detecting linearly ascending allocation requests.
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         */
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        __u32                   last_alloc_logical_block;
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        /*
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         * Was i_next_alloc_goal in ext2_inode_info
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         * is the *physical* companion to i_next_alloc_block.
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         * it the the physical block number of the block which was most-recentl
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         * allocated to this file.  This give us the goal (target) for the next
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         * allocation when we detect linearly ascending requests.
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         */
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        ext2_fsblk_t            last_alloc_physical_block;
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};
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#define rsv_start rsv_window._rsv_start
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#define rsv_end rsv_window._rsv_end
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/*
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 * second extended-fs super-block data in memory
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 */
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struct ext2_sb_info {
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        unsigned long s_frag_size;      /* Size of a fragment in bytes */
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        unsigned long s_frags_per_block;/* Number of fragments per block */
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        unsigned long s_inodes_per_block;/* Number of inodes per block */
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        unsigned long s_frags_per_group;/* Number of fragments in a group */
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        unsigned long s_blocks_per_group;/* Number of blocks in a group */
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        unsigned long s_inodes_per_group;/* Number of inodes in a group */
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        unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
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        unsigned long s_gdb_count;      /* Number of group descriptor blocks */
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        unsigned long s_desc_per_block; /* Number of group descriptors per block */
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        unsigned long s_groups_count;   /* Number of groups in the fs */
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        unsigned long s_overhead_last;  /* Last calculated overhead */
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        unsigned long s_blocks_last;    /* Last seen block count */
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        struct buffer_head * s_sbh;     /* Buffer containing the super block */
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        struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */
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        struct buffer_head ** s_group_desc;
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        unsigned long  s_mount_opt;
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        unsigned long s_sb_block;
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        uid_t s_resuid;
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        gid_t s_resgid;
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        unsigned short s_mount_state;
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        unsigned short s_pad;
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        int s_addr_per_block_bits;
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        int s_desc_per_block_bits;
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        int s_inode_size;
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        int s_first_ino;
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        spinlock_t s_next_gen_lock;
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        u32 s_next_generation;
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        unsigned long s_dir_count;
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        u8 *s_debts;
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        struct percpu_counter s_freeblocks_counter;
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        struct percpu_counter s_freeinodes_counter;
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        struct percpu_counter s_dirs_counter;
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        struct blockgroup_lock s_blockgroup_lock;
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        /* root of the per fs reservation window tree */
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        spinlock_t s_rsv_window_lock;
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        struct rb_root s_rsv_window_root;
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        struct ext2_reserve_window_node s_rsv_window_head;
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};
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#endif  /* _LINUX_EXT2_FS_SB */

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