block: Introduce .bdrv_parse_filename callback
If a driver needs structured data and not just a string, it can provide
a .bdrv_parse_filename callback now that parses the command line string
into separate options. Keeping this separate from .bdrv_open_filename
ensures that the preferred way of directly specifying the options always
works as well if parsing the string works.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
diff --git a/block.c b/block.c
index ef1ae94..8a95a28 100644
--- a/block.c
+++ b/block.c
@@ -770,6 +770,17 @@
bs->options = options;
options = qdict_clone_shallow(options);
+ if (drv->bdrv_parse_filename) {
+ Error *local_err = NULL;
+ drv->bdrv_parse_filename(filename, options, &local_err);
+ if (error_is_set(&local_err)) {
+ qerror_report_err(local_err);
+ error_free(local_err);
+ ret = -EINVAL;
+ goto fail;
+ }
+ }
+
ret = bdrv_open_common(bs, NULL, filename, options, flags, drv);
if (ret < 0) {
goto fail;
