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authorDenis Vlasenko2008-02-18 21:08:49 +0000
committerDenis Vlasenko2008-02-18 21:08:49 +0000
commitde7684a309ad20c1b889d048d741cb1dd52245f7 (patch)
treeefae3387e1978cdd128ff2a922b734d0e9d0180f /util-linux/volume_id/ext.c
parent27dd495b98a6135554b1d839fefe436ba3c6ca71 (diff)
downloadbusybox-de7684a309ad20c1b889d048d741cb1dd52245f7.zip
busybox-de7684a309ad20c1b889d048d741cb1dd52245f7.tar.gz
support for mount by label (not yet tested)
Also adds findfs applet. Closes bug 1143.
Diffstat (limited to 'util-linux/volume_id/ext.c')
-rw-r--r--util-linux/volume_id/ext.c71
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;
+}