support for mount by label (not yet tested)

Also adds findfs applet. Closes bug 1143.

util-linux/volume_id/promise_raid.c

@@ -0,0 +1,63 @@
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2005 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 promise_meta {
+	uint8_t	sig[24];
+} __attribute__((packed));
+
+#define PDC_CONFIG_OFF		0x1200
+#define PDC_SIGNATURE		"Promise Technology, Inc."
+
+int volume_id_probe_promise_fasttrack_raid(struct volume_id *id, uint64_t off, uint64_t size)
+{
+	static const unsigned short sectors[] = {
+		63, 255, 256, 16, 399
+	};
+
+	struct promise_meta *pdc;
+	unsigned i;
+
+	dbg("probing at offset 0x%llx, size 0x%llx",
+	    (unsigned long long) off, (unsigned long long) size);
+
+	if (size < 0x40000)
+		return -1;
+
+	for (i = 0; i < ARRAY_SIZE(sectors); i++) {
+		uint64_t meta_off;
+
+		meta_off = ((size / 0x200) - sectors[i]) * 0x200;
+		pdc = volume_id_get_buffer(id, off + meta_off, 0x200);
+		if (pdc == NULL)
+			return -1;
+
+		if (memcmp(pdc->sig, PDC_SIGNATURE, sizeof(PDC_SIGNATURE)-1) == 0)
+			goto found;
+	}
+	return -1;
+
+ found:
+	volume_id_set_usage(id, VOLUME_ID_RAID);
+	id->type = "promise_fasttrack_raid_member";
+
+	return 0;
+}