From d6a25b31315327eef7785b895c354cc45c3f3742 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Thu, 20 Feb 2014 15:32:38 -0800 Subject: 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 Signed-off-by: Jens Axboe --- block/blk-mq.c | 37 +++++-------------------------------- 1 file changed, 5 insertions(+), 32 deletions(-) (limited to 'block') diff --git a/block/blk-mq.c b/block/blk-mq.c index 2af840594dc1..1b8b50df3655 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -283,38 +283,10 @@ void blk_mq_free_request(struct request *rq) __blk_mq_free_request(hctx, ctx, rq); } -static void blk_mq_bio_endio(struct request *rq, struct bio *bio, int error) +bool blk_mq_end_io_partial(struct request *rq, int error, unsigned int nr_bytes) { - if (error) - clear_bit(BIO_UPTODATE, &bio->bi_flags); - else if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) - error = -EIO; - - if (unlikely(rq->cmd_flags & REQ_QUIET)) - set_bit(BIO_QUIET, &bio->bi_flags); - - /* don't actually finish bio if it's part of flush sequence */ - if (!(rq->cmd_flags & REQ_FLUSH_SEQ)) - bio_endio(bio, error); -} - -void blk_mq_end_io(struct request *rq, int error) -{ - struct bio *bio = rq->bio; - unsigned int bytes = 0; - - trace_block_rq_complete(rq->q, rq); - - while (bio) { - struct bio *next = bio->bi_next; - - bio->bi_next = NULL; - bytes += bio->bi_iter.bi_size; - blk_mq_bio_endio(rq, bio, error); - bio = next; - } - - blk_account_io_completion(rq, bytes); + if (blk_update_request(rq, error, blk_rq_bytes(rq))) + return true; blk_account_io_done(rq); @@ -322,8 +294,9 @@ void blk_mq_end_io(struct request *rq, int error) rq->end_io(rq, error); else blk_mq_free_request(rq); + return false; } -EXPORT_SYMBOL(blk_mq_end_io); +EXPORT_SYMBOL(blk_mq_end_io_partial); static void __blk_mq_complete_request_remote(void *data) { -- cgit v1.2.3