+
+static bool append_open_options(QDict *d, BlockDriverState *bs)
+{
+ const QDictEntry *entry;
+ bool found_any = false;
+
+ for (entry = qdict_first(bs->options); entry;
+ entry = qdict_next(bs->options, entry))
+ {
+ /* Only take options for this level and exclude all non-driver-specific
+ * options */
+ if (!strchr(qdict_entry_key(entry), '.') &&
+ strcmp(qdict_entry_key(entry), "node-name"))
+ {
+ qobject_incref(qdict_entry_value(entry));
+ qdict_put_obj(d, qdict_entry_key(entry), qdict_entry_value(entry));
+ found_any = true;
+ }
+ }
+
+ return found_any;
+}
+
+/* Updates the following BDS fields:
+ * - exact_filename: A filename which may be used for opening a block device
+ * which (mostly) equals the given BDS (even without any
+ * other options; so reading and writing must return the same
+ * results, but caching etc. may be different)
+ * - full_open_options: Options which, when given when opening a block device
+ * (without a filename), result in a BDS (mostly)
+ * equalling the given one
+ * - filename: If exact_filename is set, it is copied here. Otherwise,
+ * full_open_options is converted to a JSON object, prefixed with
+ * "json:" (for use through the JSON pseudo protocol) and put here.
+ */
+void bdrv_refresh_filename(BlockDriverState *bs)
+{
+ BlockDriver *drv = bs->drv;
+ QDict *opts;
+
+ if (!drv) {
+ return;
+ }
+
+ /* This BDS's file name will most probably depend on its file's name, so
+ * refresh that first */
+ if (bs->file) {
+ bdrv_refresh_filename(bs->file);
+ }
+
+ if (drv->bdrv_refresh_filename) {
+ /* Obsolete information is of no use here, so drop the old file name
+ * information before refreshing it */
+ bs->exact_filename[0] = '\0';
+ if (bs->full_open_options) {
+ QDECREF(bs->full_open_options);
+ bs->full_open_options = NULL;
+ }
+
+ drv->bdrv_refresh_filename(bs);
+ } else if (bs->file) {
+ /* Try to reconstruct valid information from the underlying file */
+ bool has_open_options;
+
+ bs->exact_filename[0] = '\0';
+ if (bs->full_open_options) {
+ QDECREF(bs->full_open_options);
+ bs->full_open_options = NULL;
+ }
+
+ opts = qdict_new();
+ has_open_options = append_open_options(opts, bs);
+
+ /* If no specific options have been given for this BDS, the filename of
+ * the underlying file should suffice for this one as well */
+ if (bs->file->exact_filename[0] && !has_open_options) {
+ strcpy(bs->exact_filename, bs->file->exact_filename);
+ }
+ /* Reconstructing the full options QDict is simple for most format block
+ * drivers, as long as the full options are known for the underlying
+ * file BDS. The full options QDict of that file BDS should somehow
+ * contain a representation of the filename, therefore the following
+ * suffices without querying the (exact_)filename of this BDS. */
+ if (bs->file->full_open_options) {
+ qdict_put_obj(opts, "driver",
+ QOBJECT(qstring_from_str(drv->format_name)));
+ QINCREF(bs->file->full_open_options);
+ qdict_put_obj(opts, "file", QOBJECT(bs->file->full_open_options));
+
+ bs->full_open_options = opts;
+ } else {
+ QDECREF(opts);
+ }
+ } else if (!bs->full_open_options && qdict_size(bs->options)) {
+ /* There is no underlying file BDS (at least referenced by BDS.file),
+ * so the full options QDict should be equal to the options given
+ * specifically for this block device when it was opened (plus the
+ * driver specification).
+ * Because those options don't change, there is no need to update
+ * full_open_options when it's already set. */
+
+ opts = qdict_new();
+ append_open_options(opts, bs);
+ qdict_put_obj(opts, "driver",
+ QOBJECT(qstring_from_str(drv->format_name)));
+
+ if (bs->exact_filename[0]) {
+ /* This may not work for all block protocol drivers (some may
+ * require this filename to be parsed), but we have to find some
+ * default solution here, so just include it. If some block driver
+ * does not support pure options without any filename at all or
+ * needs some special format of the options QDict, it needs to
+ * implement the driver-specific bdrv_refresh_filename() function.
+ */
+ qdict_put_obj(opts, "filename",
+ QOBJECT(qstring_from_str(bs->exact_filename)));
+ }
+
+ bs->full_open_options = opts;
+ }
+
+ if (bs->exact_filename[0]) {
+ pstrcpy(bs->filename, sizeof(bs->filename), bs->exact_filename);
+ } else if (bs->full_open_options) {
+ QString *json = qobject_to_json(QOBJECT(bs->full_open_options));
+ snprintf(bs->filename, sizeof(bs->filename), "json:%s",
+ qstring_get_str(json));
+ QDECREF(json);
+ }
+}
+
+/* This accessor function purpose is to allow the device models to access the
+ * BlockAcctStats structure embedded inside a BlockDriverState without being
+ * aware of the BlockDriverState structure layout.
+ * It will go away when the BlockAcctStats structure will be moved inside
+ * the device models.
+ */
+BlockAcctStats *bdrv_get_stats(BlockDriverState *bs)
+{
+ return &bs->stats;
+}