blk-mq: allow drivers to hook into I/O completion
Split out the bottom half of blk_mq_end_io so that drivers can perform work when they know a request has been completed, but before it has been freed. This also obsoletes blk_mq_end_io_partial as drivers can now pass any value to blk_update_request directly. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
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@ -294,20 +294,24 @@ void blk_mq_clone_flush_request(struct request *flush_rq,
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hctx->cmd_size);
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}
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bool blk_mq_end_io_partial(struct request *rq, int error, unsigned int nr_bytes)
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inline void __blk_mq_end_io(struct request *rq, int error)
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{
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if (blk_update_request(rq, error, blk_rq_bytes(rq)))
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return true;
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blk_account_io_done(rq);
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if (rq->end_io)
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rq->end_io(rq, error);
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else
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blk_mq_free_request(rq);
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return false;
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}
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EXPORT_SYMBOL(blk_mq_end_io_partial);
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EXPORT_SYMBOL(__blk_mq_end_io);
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void blk_mq_end_io(struct request *rq, int error)
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{
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if (blk_update_request(rq, error, blk_rq_bytes(rq)))
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BUG();
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__blk_mq_end_io(rq, error);
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}
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EXPORT_SYMBOL(blk_mq_end_io);
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static void __blk_mq_complete_request_remote(void *data)
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{
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@ -149,13 +149,8 @@ struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_ind
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struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int);
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void blk_mq_free_single_hw_queue(struct blk_mq_hw_ctx *, unsigned int);
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bool blk_mq_end_io_partial(struct request *rq, int error,
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unsigned int nr_bytes);
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static inline void blk_mq_end_io(struct request *rq, int error)
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{
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bool done = !blk_mq_end_io_partial(rq, error, blk_rq_bytes(rq));
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BUG_ON(!done);
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}
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void blk_mq_end_io(struct request *rq, int error);
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void __blk_mq_end_io(struct request *rq, int error);
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void blk_mq_complete_request(struct request *rq);
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