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block: add a blk_steal_bios helper

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This helpers allows to bounce steal the uncompleted bios from a request so
that they can be reissued on another path.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2017-11-02 21:29:51 +03:00
committed by Jens Axboe
parent f421e1d9ad
commit ef71de8b15
2 changed files with 23 additions and 0 deletions
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include/linux/blkdev.h
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@@ -1094,6 +1094,8 @@ extern struct request *blk_peek_request(struct request_queue *q);
extern void blk_start_request(struct request *rq);
extern struct request *blk_fetch_request(struct request_queue *q);
void blk_steal_bios(struct bio_list *list, struct request *rq);
/*
* Request completion related functions.
*