From 2b3109e2bd9116b7e2a027cd5ebd34aa66d02aa5 Mon Sep 17 00:00:00 2001
From: Jim Fehlig <jfehlig@novell.com>
Date: Tue, 24 Aug 2010 11:31:14 -0600
Subject: [PATCH] Add blktap2 support to xend driver

Xen4.0 includes a new blktap2 implementation, which is specified
with 'tap2' prefix.  AFAICT it's configuration syntax is identical
to blktap, with exception of 'tap2' vs 'tap' prefix.  This patch
takes the simple approach of accepting and generating sexp
containing 'tap2' prefix.
---
 src/xen/xend_internal.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/src/xen/xend_internal.c b/src/xen/xend_internal.c
index d47c625c08..1870d5ba52 100644
--- a/src/xen/xend_internal.c
+++ b/src/xen/xend_internal.c
@@ -1386,7 +1386,8 @@ xenDaemonParseSxprDisks(virDomainDefPtr def,
            but blktap disks ended up in a differently named
            (device (tap ....)) block.... */
         if (sexpr_lookup(node, "device/vbd") ||
-            sexpr_lookup(node, "device/tap")) {
+            sexpr_lookup(node, "device/tap") ||
+            sexpr_lookup(node, "device/tap2")) {
             char *offset;
             const char *src = NULL;
             const char *dst = NULL;
@@ -1397,6 +1398,10 @@ xenDaemonParseSxprDisks(virDomainDefPtr def,
                 src = sexpr_node(node, "device/vbd/uname");
                 dst = sexpr_node(node, "device/vbd/dev");
                 mode = sexpr_node(node, "device/vbd/mode");
+            } else if (sexpr_lookup(node, "device/tap2")) {
+                src = sexpr_node(node, "device/tap2/uname");
+                dst = sexpr_node(node, "device/tap2/dev");
+                mode = sexpr_node(node, "device/tap2/mode");
             } else {
                 src = sexpr_node(node, "device/tap/uname");
                 dst = sexpr_node(node, "device/tap/dev");
@@ -1444,7 +1449,8 @@ xenDaemonParseSxprDisks(virDomainDefPtr def,
 
                 src = offset + 1;
 
-                if (STREQ (disk->driverName, "tap")) {
+                if (STREQ (disk->driverName, "tap") ||
+                    STREQ (disk->driverName, "tap2")) {
                     offset = strchr(src, ':');
                     if (!offset) {
                         virXendError(VIR_ERR_INTERNAL_ERROR,
@@ -5306,9 +5312,10 @@ xenDaemonFormatSxprDisk(virConnectPtr conn ATTRIBUTE_UNUSED,
     /* Normally disks are in a (device (vbd ...)) block
      * but blktap disks ended up in a differently named
      * (device (tap ....)) block.... */
-    if (def->driverName &&
-        STREQ(def->driverName, "tap")) {
+    if (def->driverName && STREQ(def->driverName, "tap")) {
         virBufferAddLit(buf, "(tap ");
+    } else if (def->driverName && STREQ(def->driverName, "tap2")) {
+        virBufferAddLit(buf, "(tap2 ");
     } else {
         virBufferAddLit(buf, "(vbd ");
     }
@@ -5329,7 +5336,8 @@ xenDaemonFormatSxprDisk(virConnectPtr conn ATTRIBUTE_UNUSED,
 
     if (def->src) {
         if (def->driverName) {
-            if (STREQ(def->driverName, "tap")) {
+            if (STREQ(def->driverName, "tap") ||
+                STREQ(def->driverName, "tap2")) {
                 virBufferVSprintf(buf, "(uname '%s:%s:%s')",
                                   def->driverName,
                                   def->driverType ? def->driverType : "aio",
@@ -5928,6 +5936,9 @@ virDomainXMLDevID(virDomainPtr domain,
         if (dev->data.disk->driverName &&
             STREQ(dev->data.disk->driverName, "tap"))
             strcpy(class, "tap");
+        else if (dev->data.disk->driverName &&
+            STREQ(dev->data.disk->driverName, "tap2"))
+            strcpy(class, "tap2");
         else
             strcpy(class, "vbd");
 
-- 
2.39.5