support for mount by label (not yet tested)

Also adds findfs applet. Closes bug 1143.

1 files changed, 71 insertions, 0 deletions

diff --git a/util-linux/volume_id/ext.c b/util-linux/volume_id/ext.c
new file mode 100644
index 0000000..3c07f53
--- /dev/null
+++ b/util-linux/volume_id/ext.c
@@ -0,0 +1,71 @@
+/*
+ * 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 ext2_super_block {
+	uint32_t	inodes_count;
+	uint32_t	blocks_count;
+	uint32_t	r_blocks_count;
+	uint32_t	free_blocks_count;
+	uint32_t	free_inodes_count;
+	uint32_t	first_data_block;
+	uint32_t	log_block_size;
+	uint32_t	dummy3[7];
+	uint8_t	magic[2];
+	uint16_t	state;
+	uint32_t	dummy5[8];
+	uint32_t	feature_compat;
+	uint32_t	feature_incompat;
+	uint32_t	feature_ro_compat;
+	uint8_t	uuid[16];
+	uint8_t	volume_name[16];
+} __attribute__((__packed__));
+
+#define EXT3_FEATURE_COMPAT_HAS_JOURNAL		0x00000004
+#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV	0x00000008
+#define EXT_SUPERBLOCK_OFFSET			0x400
+
+int volume_id_probe_ext(struct volume_id *id, uint64_t off)
+{
+	struct ext2_super_block *es;
+
+	dbg("probing at offset 0x%llx", (unsigned long long) off);
+
+	es = volume_id_get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200);
+	if (es == NULL)
+		return -1;
+
+	if (es->magic[0] != 0123 ||
+	    es->magic[1] != 0357)
+		return -1;
+
+	volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
+	volume_id_set_label_raw(id, es->volume_name, 16);
+	volume_id_set_label_string(id, es->volume_name, 16);
+	volume_id_set_uuid(id, es->uuid, UUID_DCE);
+
+	if ((le32_to_cpu(es->feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0)
+		id->type = "ext3";
+	else
+		id->type = "ext2";
+
+	return 0;
+}