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*参照元 [#zc356025] #backlinks *注意 [#v4dbc42f] -より新しいバージョンがあります。 --[[linux-2.6.33/request_queue()]] *説明 [#bd35b1d6] -パス: [[linux-2.6.25/include/linux/blkdev.h]] -FIXME: これは何？ --説明 **参考 [#y70081a1] *実装 [#w5868ea8] 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 }; *コメント [#ud97624c]
