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blk-mq: support partial I/O completions

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Add a new blk_mq_end_io_partial function to partially complete requests
as needed by the SCSI layer.  We do this by reusing blk_update_request
to advance the bio instead of having a simplified version of it in
the blk-mq code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2014-02-20 15:32:38 -08:00 • committed by Jens Axboe
parent feb71dae1f
commit d6a25b3131
2 changed files with 12 additions and 33 deletions
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8
include/linux/blk-mq.h
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@ -133,7 +133,13 @@ struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_ind
struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_reg *, unsigned int);
void blk_mq_free_single_hw_queue(struct blk_mq_hw_ctx *, unsigned int);
void blk_mq_end_io(struct request *rq, int error);
bool blk_mq_end_io_partial(struct request *rq, int error,
unsigned int nr_bytes);
static inline void blk_mq_end_io(struct request *rq, int error)
{
bool done = !blk_mq_end_io_partial(rq, error, blk_rq_bytes(rq));
BUG_ON(!done);
}
void blk_mq_complete_request(struct request *rq);