diff options
| author | Christoph Hellwig <hch@lst.de> | 2017-11-02 21:29:51 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-11-03 10:31:48 -0600 |
| commit | ef71de8b15d891b27b8c983a9a8972b11cb4576a (patch) | |
| tree | 8fd5ab57df5aa233aeb784d12a6533e696d9df51 /block | |
| parent | f421e1d9ade4e1b88183e54425cf50e390d16a7f (diff) | |
| download | linux-ef71de8b15d891b27b8c983a9a8972b11cb4576a.tar.bz2 | |
block: add a blk_steal_bios helper
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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-core.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 96aaa3a419a3..68cfe6780a9b 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -2769,6 +2769,27 @@ struct request *blk_fetch_request(struct request_queue *q) } EXPORT_SYMBOL(blk_fetch_request); +/* + * Steal bios from a request and add them to a bio list. + * The request must not have been partially completed before. + */ +void blk_steal_bios(struct bio_list *list, struct request *rq) +{ + if (rq->bio) { + if (list->tail) + list->tail->bi_next = rq->bio; + else + list->head = rq->bio; + list->tail = rq->biotail; + + rq->bio = NULL; + rq->biotail = NULL; + } + + rq->__data_len = 0; +} +EXPORT_SYMBOL_GPL(blk_steal_bios); + /** * blk_update_request - Special helper function for request stacking drivers * @req: the request being processed |