qapi: Convert blockdev_snapshot_sync
Unfortunately, this conversion required an additional change.
In the old QMP command, the 'snapshot-file' argument is specified as
optional. The idea is to take the snapshot internally if 'snapshot-file'
is not passed. However, internal snapshots are not supported yet so
the command returns a MissingParamater error if 'snapshot-file' is not
passed. Which makes the argument actually required and will cause
compatibility breakage if we change that in the future.
To fix this the QAPI converted blockdev_snapshot_sync command makes the
'snapshot-file' argument required. Again, in practice it's actually required,
so this is not incompatible.
If we do implement internal snapshots someday, we'll need a new argument
for it.
Note that this discussion doesn't affect HMP.
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 721b157..9d68206 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -665,10 +665,8 @@
{
.name = "blockdev-snapshot-sync",
- .args_type = "device:B,snapshot-file:s?,format:s?",
- .params = "device [new-image-file] [format]",
- .user_print = monitor_user_noop,
- .mhandler.cmd_new = do_snapshot_blkdev,
+ .args_type = "device:B,snapshot-file:s,format:s?",
+ .mhandler.cmd_new = qmp_marshal_input_blockdev_snapshot_sync,
},
SQMP
