From a1fde6a871b2339b75d2627264b4b2ab6d5bbce3 Mon Sep 17 00:00:00 2001
From: Vladislav Bolkhovitin <vst@vlnb.net>
Date: Sat, 16 Mar 2013 01:18:32 +0000
Subject: [PATCH] Boost priority of HEAD OF QUEUE requests

git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@4799 d57e44dd-8a1f-0410-8b47-8ef2f437770f
---
 scst/src/dev_handlers/scst_vdisk.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/scst/src/dev_handlers/scst_vdisk.c b/scst/src/dev_handlers/scst_vdisk.c
index 88e105b5b..5c4616f12 100644
--- a/scst/src/dev_handlers/scst_vdisk.c
+++ b/scst/src/dev_handlers/scst_vdisk.c
@@ -3853,6 +3853,15 @@ static void blockio_exec_rw(struct vdisk_cmd_params *p, bool write, bool fua)
 				if (fua)
 					bio->bi_rw |= REQ_FUA;
 
+				if (cmd->queue_type == SCST_CMD_QUEUE_HEAD_OF_QUEUE) {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 1, 0)
+					bio->bi_rw |= REQ_META;
+					bio->bi_rw |= REQ_PRIO;
+#else
+					bio->bi_rw |= BIO_RW_META;
+#endif
+				}
+
 				if (!hbio)
 					hbio = tbio = bio;
 				else