aboutsummaryrefslogtreecommitdiff
path: root/block
diff options
context:
space:
mode:
authorHanna Reitz <hreitz@redhat.com>2022-06-20 18:26:53 +0200
committerKevin Wolf <kwolf@redhat.com>2023-02-01 16:52:32 +0100
commit3716470b24f0f63090d59bcf28ad8fe6fb7835bd (patch)
treeb697430a0cb2706f27dd90b1a3ca2314d069803c /block
parentfcb9e05144db51966e1476790129dbff92a0bea4 (diff)
block: Improve empty format-specific info dump
When a block driver supports obtaining format-specific information, but that object only contains optional fields, it is possible that none of them are present, so that dump_qobject() (called by bdrv_image_info_specific_dump()) will not print anything. The callers of bdrv_image_info_specific_dump() put a header above this information ("Format specific information:\n"), which will look strange when there is nothing below. Modify bdrv_image_info_specific_dump() to print this header instead of its callers, and only if there is indeed something to be printed. Signed-off-by: Hanna Reitz <hreitz@redhat.com> Message-Id: <20220620162704.80987-2-hreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block')
-rw-r--r--block/qapi.c41
1 files changed, 37 insertions, 4 deletions
diff --git a/block/qapi.c b/block/qapi.c
index 9b4da12966..0551875902 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -760,7 +760,35 @@ static void dump_qdict(int indentation, QDict *dict)
}
}
-void bdrv_image_info_specific_dump(ImageInfoSpecific *info_spec)
+/*
+ * Return whether dumping the given QObject with dump_qobject() would
+ * yield an empty dump, i.e. not print anything.
+ */
+static bool qobject_is_empty_dump(const QObject *obj)
+{
+ switch (qobject_type(obj)) {
+ case QTYPE_QNUM:
+ case QTYPE_QSTRING:
+ case QTYPE_QBOOL:
+ return false;
+
+ case QTYPE_QDICT:
+ return qdict_size(qobject_to(QDict, obj)) == 0;
+
+ case QTYPE_QLIST:
+ return qlist_empty(qobject_to(QList, obj));
+
+ default:
+ abort();
+ }
+}
+
+/**
+ * Dumps the given ImageInfoSpecific object in a human-readable form,
+ * prepending an optional prefix if the dump is not empty.
+ */
+void bdrv_image_info_specific_dump(ImageInfoSpecific *info_spec,
+ const char *prefix)
{
QObject *obj, *data;
Visitor *v = qobject_output_visitor_new(&obj);
@@ -768,7 +796,12 @@ void bdrv_image_info_specific_dump(ImageInfoSpecific *info_spec)
visit_type_ImageInfoSpecific(v, NULL, &info_spec, &error_abort);
visit_complete(v, &obj);
data = qdict_get(qobject_to(QDict, obj), "data");
- dump_qobject(1, data);
+ if (!qobject_is_empty_dump(data)) {
+ if (prefix) {
+ qemu_printf("%s", prefix);
+ }
+ dump_qobject(1, data);
+ }
qobject_unref(obj);
visit_free(v);
}
@@ -849,7 +882,7 @@ void bdrv_image_info_dump(ImageInfo *info)
}
if (info->format_specific) {
- qemu_printf("Format specific information:\n");
- bdrv_image_info_specific_dump(info->format_specific);
+ bdrv_image_info_specific_dump(info->format_specific,
+ "Format specific information:\n");
}
}