btrfs-progs: convert: add support for converting reiserfs

This patch adds support to convert reiserfs file systems in-place to btrfs.

It will convert extended attribute files to btrfs extended attributes,
translate ACLs, coalesce tails that consist of multiple items into one item,
and convert tails that are too big into indirect files.

This requires that libreiserfscore 3.6.27 be available.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 106 insertions, 0 deletions

diff --git a/convert/source-reiserfs.h b/convert/source-reiserfs.h
new file mode 100644
index 00000000..c960c2b6
--- /dev/null
+++ b/convert/source-reiserfs.h
@@ -0,0 +1,106 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef __BTRFS_CONVERT_SOURCE_REISERFS_H__
+#define __BTRFS_CONVERT_SOURCE_REISERFS_H__
+
+#if BTRFSCONVERT_REISERFS
+
+#include "kerncompat.h"
+#include <reiserfs/misc.h>
+#include <reiserfs/io.h>
+#include <reiserfs/reiserfs_lib.h>
+#include <reiserfs/reiserfs_fs.h>
+#include <linux/kdev_t.h>
+#include "convert/source-fs.h"
+
+#define REISERFS_ACL_VERSION	0x0001
+
+/* 23.2.5 acl_tag_t values */
+
+#define ACL_UNDEFINED_TAG       (0x00)
+#define ACL_USER_OBJ            (0x01)
+#define ACL_USER                (0x02)
+#define ACL_GROUP_OBJ           (0x04)
+#define ACL_GROUP               (0x08)
+#define ACL_MASK                (0x10)
+#define ACL_OTHER               (0x20)
+
+/* 23.2.7 ACL qualifier constants */
+
+#define ACL_UNDEFINED_ID        ((id_t)-1)
+
+typedef struct {
+	__le16		e_tag;
+	__le16		e_perm;
+	__le32		e_id;
+} ext2_acl_entry;
+
+typedef struct {
+	__le16		e_tag;
+	__le16		e_perm;
+} ext2_acl_entry_short;
+
+typedef struct {
+	__le32		a_version;
+} ext2_acl_header;
+
+#define ACL_EA_VERSION		0x0002
+
+typedef struct {
+	__le16		e_tag;
+	__le16		e_perm;
+	__le32		e_id;
+} acl_ea_entry;
+
+typedef struct {
+	__le32		a_version;
+	acl_ea_entry	a_entries[0];
+} acl_ea_header;
+
+static inline int ext2_acl_count(size_t size)
+{
+	ssize_t s;
+	size -= sizeof(ext2_acl_header);
+	s = size - 4 * sizeof(ext2_acl_entry_short);
+	if (s < 0) {
+		if (size % sizeof(ext2_acl_entry_short))
+			return -1;
+		return size / sizeof(ext2_acl_entry_short);
+	} else {
+		if (s % sizeof(ext2_acl_entry))
+			return -1;
+		return s / sizeof(ext2_acl_entry) + 4;
+	}
+}
+
+
+static inline size_t acl_ea_size(int count)
+{
+	return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry);
+}
+
+static inline dev_t new_decode_dev(u32 dev)
+{
+	unsigned major = (dev & 0xfff00) >> 8;
+	unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
+
+	return MKDEV(major, minor);
+}
+
+#endif	/* BTRFSCONVERT_REISERFS */
+
+#endif