linux-2.6.25/request_queue の履歴(No.43)

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パス: linux-2.6.25/include/linux/blkdev.h
FIXME: これは何？
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struct request_queue
{
        /*
         * Together with queue_head for cacheline sharing
         */
        struct list_head        queue_head;
        struct request          *last_merge;
        elevator_t              *elevator;

        /*
         * the queue request freelist, one for reads and one for writes
         */
        struct request_list     rq;

        request_fn_proc         *request_fn;
        make_request_fn         *make_request_fn;
        prep_rq_fn              *prep_rq_fn;
        unplug_fn               *unplug_fn;
        merge_bvec_fn           *merge_bvec_fn;
        prepare_flush_fn        *prepare_flush_fn;
        softirq_done_fn         *softirq_done_fn;
        dma_drain_needed_fn     *dma_drain_needed;

        /*
         * Dispatch queue sorting
         */
        sector_t                end_sector;
        struct request          *boundary_rq;

        /*
         * Auto-unplugging state
         */
        struct timer_list       unplug_timer;
        int                     unplug_thresh;  /* After this many requests */
        unsigned long           unplug_delay;   /* After this many jiffies */
        struct work_struct      unplug_work;

        struct backing_dev_info backing_dev_info;

        /*
         * The queue owner gets to use this for whatever they like.
         * ll_rw_blk doesn't touch it.
         */
        void                    *queuedata;

        /*
         * queue needs bounce pages for pages above this limit
         */
        unsigned long           bounce_pfn;
        gfp_t                   bounce_gfp;

        /*
         * various queue flags, see QUEUE_* below
         */
        unsigned long           queue_flags;

        /*
         * protects queue structures from reentrancy. ->__queue_lock should
         * _never_ be used directly, it is queue private. always use
         * ->queue_lock.
         */
        spinlock_t              __queue_lock;
        spinlock_t              *queue_lock;

        /*
         * queue kobject
         */
        struct kobject kobj;

        /*
         * queue settings
         */
        unsigned long           nr_requests;    /* Max # of requests */
        unsigned int            nr_congestion_on;
        unsigned int            nr_congestion_off;
        unsigned int            nr_batching;

        unsigned int            max_sectors;
        unsigned int            max_hw_sectors;
        unsigned short          max_phys_segments;
        unsigned short          max_hw_segments;
        unsigned short          hardsect_size;
        unsigned int            max_segment_size;

        unsigned long           seg_boundary_mask;
        void                    *dma_drain_buffer;
        unsigned int            dma_drain_size;
        unsigned int            dma_pad_mask;
        unsigned int            dma_alignment;

        struct blk_queue_tag    *queue_tags;
        struct list_head        tag_busy_list;

        unsigned int            nr_sorted;
        unsigned int            in_flight;

        /*
         * sg stuff
         */
        unsigned int            sg_timeout;
        unsigned int            sg_reserved_size;
        int                     node;
#ifdef CONFIG_BLK_DEV_IO_TRACE
        struct blk_trace        *blk_trace;
#endif
        /*
         * reserved for flush operations
         */
        unsigned int            ordered, next_ordered, ordseq;
        int                     orderr, ordcolor;
        struct request          pre_flush_rq, bar_rq, post_flush_rq;
        struct request          *orig_bar_rq;

        struct mutex            sysfs_lock;

#if defined(CONFIG_BLK_DEV_BSG)
        struct bsg_class_device bsg_dev;
#endif
};
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linux-2.6.25/request_queue の履歴(No.43)

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