Merge tag 'for-linus-4.3-merge-window-part-1' of git://git.kernel.org/pub/scm/linux...

[firefly-linux-kernel-4.4.55.git] / block / blk-mq-tag.h

diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h
index 75893a34237d2eb2b4d07bd21a70cc35948c172a..9eb2cf4f01cb874706d64af87a01e94e0121f7e4 100644 (file)
--- a/block/blk-mq-tag.h
+++ b/block/blk-mq-tag.h
@@ -89,4 +89,16 @@ static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
        __blk_mq_tag_idle(hctx);
 }
 
+/*
+ * This helper should only be used for flush request to share tag
+ * with the request cloned from, and both the two requests can't be
+ * in flight at the same time. The caller has to make sure the tag
+ * can't be freed.
+ */
+static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
+               unsigned int tag, struct request *rq)
+{
+       hctx->tags->rqs[tag] = rq;
+}
+
 #endif