1 files changed, 122 insertions, 0 deletions
diff --git a/lib/ext2fs/dupfs.c b/lib/ext2fs/dupfs.c
new file mode 100644
index 0000000..02721e1
--- /dev/null
+++ b/lib/ext2fs/dupfs.c
@@ -0,0 +1,122 @@
+/*
+ * dupfs.c --- duplicate a ext2 filesystem handle
+ *
+ * Copyright (C) 1997, 1998, 2001, 2003, 2005 by Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+#include "config.h"
+#include <stdio.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <time.h>
+#include <string.h>
+
+#include "ext2_fs.h"
+#include "ext2fsP.h"
+
+errcode_t ext2fs_dup_handle(ext2_filsys src, ext2_filsys *dest)
+{
+	ext2_filsys	fs;
+	errcode_t	retval;
+
+	EXT2_CHECK_MAGIC(src, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+	retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), &fs);
+	if (retval)
+		return retval;
+
+	*fs = *src;
+	fs->device_name = 0;
+	fs->super = 0;
+	fs->orig_super = 0;
+	fs->group_desc = 0;
+	fs->inode_map = 0;
+	fs->block_map = 0;
+	fs->badblocks = 0;
+	fs->dblist = 0;
+	fs->mmp_buf = 0;
+	fs->mmp_cmp = 0;
+	fs->mmp_fd = -1;
+
+	io_channel_bumpcount(fs->io);
+	if (fs->icache)
+		fs->icache->refcount++;
+
+	retval = ext2fs_get_mem(strlen(src->device_name)+1, &fs->device_name);
+	if (retval)
+		goto errout;
+	strcpy(fs->device_name, src->device_name);
+
+	retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->super);
+	if (retval)
+		goto errout;
+	memcpy(fs->super, src->super, SUPERBLOCK_SIZE);
+
+	retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->orig_super);
+	if (retval)
+		goto errout;
+	memcpy(fs->orig_super, src->orig_super, SUPERBLOCK_SIZE);
+
+	retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
+				&fs->group_desc);
+	if (retval)
+		goto errout;
+	memcpy(fs->group_desc, src->group_desc,
+	       (size_t) fs->desc_blocks * fs->blocksize);
+
+	if (src->inode_map) {
+		retval = ext2fs_copy_bitmap(src->inode_map, &fs->inode_map);
+		if (retval)
+			goto errout;
+	}
+	if (src->block_map) {
+		retval = ext2fs_copy_bitmap(src->block_map, &fs->block_map);
+		if (retval)
+			goto errout;
+	}
+	if (src->badblocks) {
+		retval = ext2fs_badblocks_copy(src->badblocks, &fs->badblocks);
+		if (retval)
+			goto errout;
+	}
+	if (src->dblist) {
+		retval = ext2fs_copy_dblist(src->dblist, &fs->dblist);
+		if (retval)
+			goto errout;
+	}
+	if (src->mmp_buf) {
+		retval = ext2fs_get_mem(src->blocksize, &fs->mmp_buf);
+		if (retval)
+			goto errout;
+		memcpy(fs->mmp_buf, src->mmp_buf, src->blocksize);
+	}
+	if (src->mmp_fd >= 0) {
+		fs->mmp_fd = dup(src->mmp_fd);
+		if (fs->mmp_fd < 0) {
+			retval = EXT2_ET_MMP_OPEN_DIRECT;
+			goto errout;
+		}
+	}
+	if (src->mmp_cmp) {
+		int align = ext2fs_get_dio_alignment(src->mmp_fd);
+
+		retval = ext2fs_get_memalign(src->blocksize, align,
+					     &fs->mmp_cmp);
+		if (retval)
+			goto errout;
+		memcpy(fs->mmp_cmp, src->mmp_cmp, src->blocksize);
+	}
+	*dest = fs;
+	return 0;
+errout:
+	ext2fs_free(fs);
+	return retval;
+
+}
+