[Qemu-devel] [PATCH 07/14] qerror: add additional parameter to QERR_DEVICE_ENCRYPTED

[Anthony Liguori <aliguori@us.ibm.com>]

Changing an encrypted block device requires a flow of:

 1) change device
 2) receive error from change
 3) block_passwd

DeviceEncrypted receives the device name but with a block backend with multiple
backing files, any one of the backing files could be encrypted.  From a UI
perspective, you have no way of knowing which file is encrypted without parsing
the qcow2 files :-/

Add the actual encrypted filename to the error message so that a UI can display
that information to the user.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
 monitor.c |    3 ++-
 qerror.h  |    2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/monitor.c b/monitor.c
index 5595565..5cb36cd 100644
--- a/monitor.c
+++ b/monitor.c
@@ -5319,7 +5319,8 @@ int monitor_read_bdrv_key_start(Monitor *mon, BlockDriverState *bs,
     }
 
     if (monitor_ctrl_mode(mon)) {
-        qerror_report(QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs));
+        qerror_report(QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
+                      bdrv_get_encrypted_filename(bs));
         return -1;
     }
 
diff --git a/qerror.h b/qerror.h
index 4fe24aa..3bbff5c 100644
--- a/qerror.h
+++ b/qerror.h
@@ -64,7 +64,7 @@ QError *qobject_to_qerror(const QObject *obj);
     "{ 'class': 'CommandNotFound', 'data': { 'name': %s } }"
 
 #define QERR_DEVICE_ENCRYPTED \
-    "{ 'class': 'DeviceEncrypted', 'data': { 'device': %s } }"
+    "{ 'class': 'DeviceEncrypted', 'data': { 'device': %s, 'filename': %s} }"
 
 #define QERR_DEVICE_INIT_FAILED \
     "{ 'class': 'DeviceInitFailed', 'data': { 'device': %s } }"
-- 
1.7.4.1