volume_id: provide libvolume_id.a file

Signed-off-by: Kay Sievers <kay.sievers@suse.de>

1 files changed, 116 insertions, 0 deletions

diff --git a/extras/volume_id/libvolume_id/ext.c b/extras/volume_id/libvolume_id/ext.c
new file mode 100644
index 0000000000..d1f62dfb6f
--- /dev/null
+++ b/extras/volume_id/libvolume_id/ext.c
@@ -0,0 +1,116 @@
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ *	This program is free software; you can redistribute it and/or modify it
+ *	under the terms of the GNU General Public License as published by the
+ *	Free Software Foundation version 2 of the License.
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include "volume_id.h"
+#include "util.h"
+#include "logging.h"
+
+struct ext2_super_block {
+	uint32_t	s_inodes_count;
+	uint32_t	s_blocks_count;
+	uint32_t	s_r_blocks_count;
+	uint32_t	s_free_blocks_count;
+	uint32_t	s_free_inodes_count;
+	uint32_t	s_first_data_block;
+	uint32_t	s_log_block_size;
+	uint32_t	s_log_frag_size;
+	uint32_t	s_blocks_per_group;
+	uint32_t	s_frags_per_group;
+	uint32_t	s_inodes_per_group;
+	uint32_t	s_mtime;
+	uint32_t	s_wtime;
+	uint16_t	s_mnt_count;
+	uint16_t	s_max_mnt_count;
+	uint16_t	s_magic;
+	uint16_t	s_state;
+	uint16_t	s_errors;
+	uint16_t	s_minor_rev_level;
+	uint32_t	s_lastcheck;
+	uint32_t	s_checkinterval;
+	uint32_t	s_creator_os;
+	uint32_t	s_rev_level;
+	uint16_t	s_def_resuid;
+	uint16_t	s_def_resgid;
+	uint32_t	s_first_ino;
+	uint16_t	s_inode_size;
+	uint16_t	s_block_group_nr;
+	uint32_t	s_feature_compat;
+	uint32_t	s_feature_incompat;
+	uint32_t	s_feature_ro_compat;
+	uint8_t		s_uuid[16];
+	uint8_t		s_volume_name[16];
+} __attribute__((__packed__));
+
+#define EXT_SUPER_MAGIC				0xEF53
+#define EXT3_FEATURE_COMPAT_HAS_JOURNAL		0x00000004
+#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV	0x00000008
+#define EXT_SUPERBLOCK_OFFSET			0x400
+
+#define EXT3_MIN_BLOCK_SIZE			0x400
+#define EXT3_MAX_BLOCK_SIZE			0x1000
+
+int volume_id_probe_ext(struct volume_id *id, uint64_t off)
+{
+	struct ext2_super_block *es;
+	size_t bsize;
+
+	dbg("probing at offset 0x%llx", (unsigned long long) off);
+
+	es = (struct ext2_super_block *) volume_id_get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200);
+	if (es == NULL)
+		return -1;
+
+	if (es->s_magic != cpu_to_le16(EXT_SUPER_MAGIC))
+		return -1;
+
+	bsize = 0x400 << le32_to_cpu(es->s_log_block_size);
+	dbg("ext blocksize 0x%zx", bsize);
+	if (bsize < EXT3_MIN_BLOCK_SIZE || bsize > EXT3_MAX_BLOCK_SIZE) {
+		dbg("invalid ext blocksize");
+		return -1;
+	}
+
+	volume_id_set_label_raw(id, es->s_volume_name, 16);
+	volume_id_set_label_string(id, es->s_volume_name, 16);
+	volume_id_set_uuid(id, es->s_uuid, UUID_DCE);
+	snprintf(id->type_version, sizeof(id->type_version)-1,
+		 "%u.%u", es->s_rev_level, es->s_minor_rev_level);
+
+	/* check for external journal device */
+	if ((le32_to_cpu(es->s_feature_incompat) & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) != 0) {
+		volume_id_set_usage(id, VOLUME_ID_OTHER);
+		id->type = "jbd";
+		return 0;
+	}
+
+	/* check for ext2 / ext3 */
+	volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
+	if ((le32_to_cpu(es->s_feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0)
+		id->type = "ext3";
+	else
+		id->type = "ext2";
+
+	return 0;
+}