[Qemu-devel] [PATCH] block: Probe file for specified format

[Stefan Weil]

Probe for the file format if the file format was specified explicitly
and a probe function is available.

example: -drive file=myfile,format=qcow2

Then myfile is probed and must be in qcow2 format.

This fixes those bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=556482
https://bugs.launchpad.net/qemu/+bug/1090600

Signed-off-by: Stefan Weil <address@hidden>
---

This patch can also be used for the latest stable version of QEMU.

 blockdev.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/blockdev.c b/blockdev.c
index 9a05e57..5a4cd56 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -411,6 +411,13 @@ DriveInfo *drive_init(QemuOpts *opts, BlockInterfaceType 
block_default_type)
             error_report("'%s' invalid format", buf);
             return NULL;
         }
+        if (file && drv->bdrv_probe) {
+            uint8_t data[2048];
+            if (drv->bdrv_probe(data, sizeof(data), file) == 0) {
+                error_report("file '%s' not in '%s' format", file, buf);
+                return NULL;
+            }
+        }
     }
 
     /* disk I/O throttling */
-- 
1.7.10.4