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| author | Ming Lei <ming.lei@canonical.com> | 2014-09-25 23:23:43 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-09-25 15:22:40 -0600 |
| commit | 7c94e1c157a227837b04f02f5edeff8301410ba2 (patch) | |
| tree | 3b592095b0204ebad61dd22b77aa1e72595dbc3a /block/blk.h | |
| parent | 7ddab5de5b80d3111f9e6765714e728b2c4f1c07 (diff) | |
| download | lwn-7c94e1c157a227837b04f02f5edeff8301410ba2.tar.gz lwn-7c94e1c157a227837b04f02f5edeff8301410ba2.zip | |
block: introduce blk_flush_queue to drive flush machinery
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>
Diffstat (limited to 'block/blk.h')
| -rw-r--r-- | block/blk.h | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/block/blk.h b/block/blk.h index c6fa3d4c6a89..833c4ac6c4eb 100644 --- a/block/blk.h +++ b/block/blk.h @@ -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)) || |