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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 <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Ming Lei 2014-09-25 23:23:43 +08:00 • committed by Jens Axboe
commit 7c94e1c157
5 changed files with 99 additions and 56 deletions
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22
block/blk.h
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@ -12,11 +12,28 @@
/* Max future timer expiry for timeouts */
#define BLK_MAX_TIMEOUT (5 * HZ)
struct blk_flush_queue {
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;
};
extern struct kmem_cache *blk_requestq_cachep;
extern struct kmem_cache *request_cachep;
extern struct kobj_type blk_queue_ktype;
extern struct ida blk_queue_ida;
static inline struct blk_flush_queue *blk_get_flush_queue(
struct request_queue *q)
{
return q->fq;
}
static inline void __blk_get_queue(struct request_queue *q)
{
kobject_get(&q->kobj);
@ -89,6 +106,7 @@ void blk_insert_flush(struct request *rq);
static inline struct request *__elv_next_request(struct request_queue *q)
{
struct request *rq;
struct blk_flush_queue *fq = blk_get_flush_queue(q);
while (1) {
if (!list_empty(&q->queue_head)) {
@ -111,9 +129,9 @@ static inline struct request *__elv_next_request(struct request_queue *q)
* should be restarted later. Please see flush_end_io() for
* details.
*/
if (q->flush_pending_idx != q->flush_running_idx &&
if (fq->flush_pending_idx != fq->flush_running_idx &&
!queue_flush_queueable(q)) {
q->flush_queue_delayed = 1;
fq->flush_queue_delayed = 1;
return NULL;
}
if (unlikely(blk_queue_bypass(q)) ||