Btrfs: introduce BTRFS_IOC_SEND for btrfs send/receive
This patch introduces the BTRFS_IOC_SEND ioctl that is
required for send. It allows btrfs-progs to implement
full and incremental sends. Patches for btrfs-progs will
follow.
Signed-off-by: Alexander Block <ablock84@googlemail.com>
Reviewed-by: David Sterba <dave@jikos.cz>
Reviewed-by: Arne Jansen <sensille@gmx.net>
Reviewed-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
Reviewed-by: Alex Lyakas <alex.bolshoy.btrfs@gmail.com>
diff --git a/fs/btrfs/send.h b/fs/btrfs/send.h
new file mode 100644
index 0000000..9934e94
--- /dev/null
+++ b/fs/btrfs/send.h
@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2012 Alexander Block. All rights reserved.
+ * Copyright (C) 2012 STRATO. All rights reserved.
+ *
+ * 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.
+ */
+
+#include "ctree.h"
+
+#define BTRFS_SEND_STREAM_MAGIC "btrfs-stream"
+#define BTRFS_SEND_STREAM_VERSION 1
+
+#define BTRFS_SEND_BUF_SIZE (1024 * 64)
+#define BTRFS_SEND_READ_SIZE (1024 * 48)
+
+enum btrfs_tlv_type {
+ BTRFS_TLV_U8,
+ BTRFS_TLV_U16,
+ BTRFS_TLV_U32,
+ BTRFS_TLV_U64,
+ BTRFS_TLV_BINARY,
+ BTRFS_TLV_STRING,
+ BTRFS_TLV_UUID,
+ BTRFS_TLV_TIMESPEC,
+};
+
+struct btrfs_stream_header {
+ char magic[sizeof(BTRFS_SEND_STREAM_MAGIC)];
+ __le32 version;
+} __attribute__ ((__packed__));
+
+struct btrfs_cmd_header {
+ /* len excluding the header */
+ __le32 len;
+ __le16 cmd;
+ /* crc including the header with zero crc field */
+ __le32 crc;
+} __attribute__ ((__packed__));
+
+struct btrfs_tlv_header {
+ __le16 tlv_type;
+ /* len excluding the header */
+ __le16 tlv_len;
+} __attribute__ ((__packed__));
+
+/* commands */
+enum btrfs_send_cmd {
+ BTRFS_SEND_C_UNSPEC,
+
+ BTRFS_SEND_C_SUBVOL,
+ BTRFS_SEND_C_SNAPSHOT,
+
+ BTRFS_SEND_C_MKFILE,
+ BTRFS_SEND_C_MKDIR,
+ BTRFS_SEND_C_MKNOD,
+ BTRFS_SEND_C_MKFIFO,
+ BTRFS_SEND_C_MKSOCK,
+ BTRFS_SEND_C_SYMLINK,
+
+ BTRFS_SEND_C_RENAME,
+ BTRFS_SEND_C_LINK,
+ BTRFS_SEND_C_UNLINK,
+ BTRFS_SEND_C_RMDIR,
+
+ BTRFS_SEND_C_SET_XATTR,
+ BTRFS_SEND_C_REMOVE_XATTR,
+
+ BTRFS_SEND_C_WRITE,
+ BTRFS_SEND_C_CLONE,
+
+ BTRFS_SEND_C_TRUNCATE,
+ BTRFS_SEND_C_CHMOD,
+ BTRFS_SEND_C_CHOWN,
+ BTRFS_SEND_C_UTIMES,
+
+ BTRFS_SEND_C_END,
+ __BTRFS_SEND_C_MAX,
+};
+#define BTRFS_SEND_C_MAX (__BTRFS_SEND_C_MAX - 1)
+
+/* attributes in send stream */
+enum {
+ BTRFS_SEND_A_UNSPEC,
+
+ BTRFS_SEND_A_UUID,
+ BTRFS_SEND_A_CTRANSID,
+
+ BTRFS_SEND_A_INO,
+ BTRFS_SEND_A_SIZE,
+ BTRFS_SEND_A_MODE,
+ BTRFS_SEND_A_UID,
+ BTRFS_SEND_A_GID,
+ BTRFS_SEND_A_RDEV,
+ BTRFS_SEND_A_CTIME,
+ BTRFS_SEND_A_MTIME,
+ BTRFS_SEND_A_ATIME,
+ BTRFS_SEND_A_OTIME,
+
+ BTRFS_SEND_A_XATTR_NAME,
+ BTRFS_SEND_A_XATTR_DATA,
+
+ BTRFS_SEND_A_PATH,
+ BTRFS_SEND_A_PATH_TO,
+ BTRFS_SEND_A_PATH_LINK,
+
+ BTRFS_SEND_A_FILE_OFFSET,
+ BTRFS_SEND_A_DATA,
+
+ BTRFS_SEND_A_CLONE_UUID,
+ BTRFS_SEND_A_CLONE_CTRANSID,
+ BTRFS_SEND_A_CLONE_PATH,
+ BTRFS_SEND_A_CLONE_OFFSET,
+ BTRFS_SEND_A_CLONE_LEN,
+
+ __BTRFS_SEND_A_MAX,
+};
+#define BTRFS_SEND_A_MAX (__BTRFS_SEND_A_MAX - 1)
+
+#ifdef __KERNEL__
+long btrfs_ioctl_send(struct file *mnt_file, void __user *arg);
+#endif