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authorChristoph Hellwig <hch@infradead.org>2014-02-21 03:32:38 +0400
committerJens Axboe <axboe@fb.com>2014-02-21 20:58:49 +0400
commitd6a25b31315327eef7785b895c354cc45c3f3742 (patch)
treef32ed70506c097efa67526ed4a1eb63482056046 /include/linux/blk-mq.h
parentfeb71dae1f9e0aeb056f7f639a21e620d327fc66 (diff)
downloadlinux-d6a25b31315327eef7785b895c354cc45c3f3742.tar.xz
blk-mq: support partial I/O completions
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>
Diffstat (limited to 'include/linux/blk-mq.h')
-rw-r--r--include/linux/blk-mq.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index ff28fe37ddda..2ff2e8d982be 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -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);