blockdev: fix drive-mirror 'granularity' error message

Name the 'granularity' parameter and give its expected value range.
Previously the device name was mistakenly reported as the parameter
name.

Note that the error class is unchanged from ERROR_CLASS_GENERIC_ERROR.

Reported-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Benoît Canet <benoit.canet@nodalink.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/blockdev.c b/blockdev.c
index 6a204c6..eeb414e 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2179,11 +2179,12 @@ void qmp_drive_mirror(const char *device, const char *target,
     }
 
     if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
-        error_set(errp, QERR_INVALID_PARAMETER, device);
+        error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
+                  "a value in range [512B, 64MB]");
         return;
     }
     if (granularity & (granularity - 1)) {
-        error_set(errp, QERR_INVALID_PARAMETER, device);
+        error_set(errp, QERR_INVALID_PARAMETER_VALUE, "granularity", "power of 2");
         return;
     }