support for mount by label (not yet tested)

Also adds findfs applet. Closes bug 1143.

util-linux/volume_id/romfs.c

@@ -0,0 +1,54 @@
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ *	This library is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU Lesser General Public
+ *	License as published by the Free Software Foundation; either
+ *	version 2.1 of the License, or (at your option) any later version.
+ *
+ *	This library is distributed in the hope that it will be useful,
+ *	but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ *	Lesser General Public License for more details.
+ *
+ *	You should have received a copy of the GNU Lesser General Public
+ *	License along with this library; if not, write to the Free Software
+ *	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "volume_id_internal.h"
+
+struct romfs_super {
+	uint8_t magic[8];
+	uint32_t size;
+	uint32_t checksum;
+	uint8_t name[0];
+} __attribute__((__packed__));
+
+int volume_id_probe_romfs(struct volume_id *id, uint64_t off)
+{
+	struct romfs_super *rfs;
+
+	dbg("probing at offset 0x%llx", (unsigned long long) off);
+
+	rfs = volume_id_get_buffer(id, off, 0x200);
+	if (rfs == NULL)
+		return -1;
+
+	if (memcmp(rfs->magic, "-rom1fs-", 4) == 0) {
+		size_t len = strlen((char *)rfs->name);
+
+		if (len) {
+			volume_id_set_label_raw(id, rfs->name, len);
+			volume_id_set_label_string(id, rfs->name, len);
+		}
+
+		volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
+		id->type = "romfs";
+		return 0;
+	}
+
+	return -1;
+}