[Xen-devel] [PATCH] libxl, hotplug/Linux: default to phy backend for raw format file

[Wei Liu <wei.liu2@xxxxxxxxxx>]

Modify libxl to allow raw format file to use phy backend.

For the hotplug script part, learn from NetBSD's block hotplug script --
test the path and determine the actual type of file (block device or
regular file) then use the actual type to determine which branch to run.

With these changes, plus the current ordering of backend preference
(phy > qdisk > tap), we will use phy backend for raw format file by
default.

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 tools/hotplug/Linux/block |   16 +++++++++-------
 tools/libxl/libxl_linux.c |    6 +++---
 2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/tools/hotplug/Linux/block b/tools/hotplug/Linux/block
index da26e22..8d2ee9d 100644
--- a/tools/hotplug/Linux/block
+++ b/tools/hotplug/Linux/block
@@ -206,6 +206,13 @@ and so cannot be mounted ${m2}${when}."
 
 
 t=$(xenstore_read_default "$XENBUS_PATH/type" 'MISSING')
+p=$(xenstore_read "$XENBUS_PATH/params")
+mode=$(xenstore_read "$XENBUS_PATH/mode")
+if [ -b "$p" ]; then
+    truetype="phy"
+elif [ -f "$p" ]; then
+    truetype="file"
+fi
 
 case "$command" in
   add)
@@ -217,16 +224,11 @@ case "$command" in
       exit 0
     fi
 
-    if [ -n "$t" ]
-    then
-      p=$(xenstore_read "$XENBUS_PATH/params")
-      mode=$(xenstore_read "$XENBUS_PATH/mode")
-    fi
     FRONTEND_ID=$(xenstore_read "$XENBUS_PATH/frontend-id")
     FRONTEND_UUID=$(xenstore_read_default \
             "/local/domain/$FRONTEND_ID/vm" 'unknown')
 
-    case $t in 
+    case $truetype in
       phy)
         dev=$(expand_dev $p)
 
@@ -319,7 +321,7 @@ mount it read-write in a guest domain."
     ;;
 
   remove)
-    case $t in 
+    case $truetype in
       phy)
        exit 0
        ;;
diff --git a/tools/libxl/libxl_linux.c b/tools/libxl/libxl_linux.c
index 37815eb..3cfa6da 100644
--- a/tools/libxl/libxl_linux.c
+++ b/tools/libxl/libxl_linux.c
@@ -19,11 +19,11 @@
  
 int libxl__try_phy_backend(mode_t st_mode)
 {
-    if (!S_ISBLK(st_mode)) {
-        return 0;
+    if (S_ISBLK(st_mode) || S_ISREG(st_mode)) {
+        return 1;
     }
 
-    return 1;
+    return 0;
 }
 
 #define EXT_SHIFT 28
-- 
1.7.10.4


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