block: seperate bio/request unplug and sync bits

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 044467e..75426e4 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -108,6 +108,7 @@
 	__REQ_RW_META,		/* metadata io request */
 	__REQ_COPY_USER,	/* contains copies of user pages */
 	__REQ_INTEGRITY,	/* integrity metadata has been remapped */
+	__REQ_UNPLUG,		/* unplug queue on submission */
 	__REQ_NR_BITS,		/* stops here */
 };
 
@@ -134,6 +135,7 @@
 #define REQ_RW_META	(1 << __REQ_RW_META)
 #define REQ_COPY_USER	(1 << __REQ_COPY_USER)
 #define REQ_INTEGRITY	(1 << __REQ_INTEGRITY)
+#define REQ_UNPLUG	(1 << __REQ_UNPLUG)
 
 #define BLK_MAX_CDB	16