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block: introduce blk_flush_queue to drive flush machinery

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This patch introduces 'struct blk_flush_queue' and puts all
flush machinery related fields into this structure, so that

	- flush implementation details aren't exposed to driver
	- it is easy to convert to per dispatch-queue flush machinery

This patch is basically a mechanical replacement.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lei 2014-09-25 23:23:43 +08:00 • committed by Jens Axboe
parent 7ddab5de5b
commit 7c94e1c157
5 changed files with 100 additions and 57 deletions
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10
include/linux/blkdev.h
View file

@ -36,6 +36,7 @@ struct request;
struct sg_io_hdr;
struct bsg_job;
struct blkcg_gq;
struct blk_flush_queue;
#define BLKDEV_MIN_RQ 4
#define BLKDEV_MAX_RQ 128 /* Default maximum */
@ -455,14 +456,7 @@ struct request_queue {
*/
unsigned int flush_flags;
unsigned int flush_not_queueable:1;
unsigned int flush_queue_delayed:1;
unsigned int flush_pending_idx:1;
unsigned int flush_running_idx:1;
unsigned long flush_pending_since;
struct list_head flush_queue[2];
struct list_head flush_data_in_flight;
struct request *flush_rq;
spinlock_t mq_flush_lock;
struct blk_flush_queue *fq;
struct list_head requeue_list;
spinlock_t requeue_lock;