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authorKiyoshi Ueda <k-ueda@ct.jp.nec.com>2008-09-18 18:45:38 +0400
committerJens Axboe <jens.axboe@oracle.com>2008-10-09 10:56:18 +0400
commit82124d60354846623a4b94af335717a5e142a074 (patch)
treeaf7b98d5ef57483cfac53cc4866194391c3ff7b7 /include/linux/blkdev.h
parent32fab448e5e86694beade415e750363538ea5f49 (diff)
downloadlinux-82124d60354846623a4b94af335717a5e142a074.tar.xz
block: add request submission interface
This patch adds blk_insert_cloned_request(), a generic request submission interface for request stacking drivers. Request-based dm will use it to submit their clones to underlying devices. blk_rq_check_limits() is also added because it is possible that the lower queue has stronger limitations than the upper queue if multiple drivers are stacking at request-level. Not only for blk_insert_cloned_request()'s internal use, the function will be used by request-based dm when the queue limitation is modified (e.g. by replacing dm's table). Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com> Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include/linux/blkdev.h')
-rw-r--r--include/linux/blkdev.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index e82a84c9f37a..964c246bc271 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -693,6 +693,9 @@ extern void __blk_put_request(struct request_queue *, struct request *);
extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
extern void blk_insert_request(struct request_queue *, struct request *, int, void *);
extern void blk_requeue_request(struct request_queue *, struct request *);
+extern int blk_rq_check_limits(struct request_queue *q, struct request *rq);
+extern int blk_insert_cloned_request(struct request_queue *q,
+ struct request *rq);
extern void blk_plug_device(struct request_queue *);
extern void blk_plug_device_unlocked(struct request_queue *);
extern int blk_remove_plug(struct request_queue *);