@@ -547,6 +547,7 @@ struct BlockDriverState {
char backing_file[PATH_MAX]; /* if non zero, the image is a diff of
this file image */
char backing_format[16]; /* if non-zero and backing_file exists */
+ bool backing_overridden; /* backing file has been specified by the user */
QDict *full_open_options;
char exact_filename[PATH_MAX];
@@ -2147,6 +2147,11 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
reference = qdict_get_try_str(parent_options, bdref_key);
if (reference || qdict_haskey(options, "file.filename")) {
backing_filename[0] = '\0';
+
+ /* FIXME: Should also be set to true if @options contains other runtime
+ * options which control the data that is read from the backing
+ * BDS */
+ bs->backing_overridden = true;
} else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) {
QDECREF(options);
goto free_exit;
@@ -2346,6 +2351,9 @@ static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs,
goto out;
}
+ bs_snapshot->backing_overridden = true;
+ bdrv_refresh_filename(bs_snapshot);
+
out:
QDECREF(snapshot_options);
g_free(tmp_filename);
@@ -2476,6 +2484,7 @@ static BlockDriverState *bdrv_open_inherit(const char *filename,
backing = qdict_get_try_str(options, "backing");
if (backing && *backing == '\0') {
flags |= BDRV_O_NO_BACKING;
+ bs->backing_overridden = true;
qdict_del(options, "backing");
}
@@ -4799,6 +4808,10 @@ void bdrv_refresh_filename(BlockDriverState *bs)
* refresh those first */
QLIST_FOREACH(child, &bs->children, next) {
bdrv_refresh_filename(child->bs);
+
+ if (child->role == &child_backing && child->bs->backing_overridden) {
+ bs->backing_overridden = true;
+ }
}
if (drv->bdrv_refresh_filename) {
@@ -536,6 +536,10 @@ static void mirror_exit(BlockJob *job, void *opaque)
error_report_err(local_err);
data->ret = -EPERM;
}
+
+ /* The target image's file already has been created with the backing
+ * file we just set, so there is no need to set backing_overridden or
+ * call bdrv_refresh_filename(). */
}
if (s->to_replace) {
@@ -1787,6 +1787,8 @@ static void external_snapshot_commit(BlkActionState *common)
{
ExternalSnapshotState *state =
DO_UPCAST(ExternalSnapshotState, common, common);
+ TransactionAction *action = common->action;
+ bool image_was_existing = false;
/* We don't need (or want) to use the transactional
* bdrv_reopen_multiple() across all the entries at once, because we
@@ -1795,6 +1797,20 @@ static void external_snapshot_commit(BlkActionState *common)
bdrv_reopen(state->old_bs, state->old_bs->open_flags & ~BDRV_O_RDWR,
NULL);
}
+
+ if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
+ BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
+ if (s->has_mode && s->mode == NEW_IMAGE_MODE_EXISTING) {
+ image_was_existing = true;
+ }
+ } else {
+ image_was_existing = true;
+ }
+
+ if (image_was_existing) {
+ state->new_bs->backing_overridden = true;
+ bdrv_refresh_filename(state->new_bs);
+ }
}
static void external_snapshot_abort(BlkActionState *common)