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 000000000..3c07f5301
--- /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;
+}