linux/fs/btrfs/send.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2012 Alexander Block.  All rights reserved.
 * Copyright (C) 2012 STRATO.  All rights reserved.
 */

#ifndef BTRFS_SEND_H
#define BTRFS_SEND_H

#include <linux/types.h>
#include <linux/sizes.h>
#include <linux/align.h>

struct btrfs_inode;
struct btrfs_ioctl_send_args;

#define BTRFS_SEND_STREAM_MAGIC "btrfs-stream"
/* Conditional support for the upcoming protocol version. */
#ifdef CONFIG_BTRFS_DEBUG
#define BTRFS_SEND_STREAM_VERSION 3
#else
#define BTRFS_SEND_STREAM_VERSION 2
#endif

/*
 * In send stream v1, no command is larger than 64K. In send stream v2, no
 * limit should be assumed, the buffer size is set to be a header with
 * compressed extent size.
 */
#define BTRFS_SEND_BUF_SIZE_V1				SZ_64K
#define BTRFS_SEND_BUF_SIZE_V2	ALIGN(SZ_16K + BTRFS_MAX_COMPRESSED, PAGE_SIZE)

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		= 0,

	/* Version 1 */
	BTRFS_SEND_C_SUBVOL		= 1,
	BTRFS_SEND_C_SNAPSHOT		= 2,

	BTRFS_SEND_C_MKFILE		= 3,
	BTRFS_SEND_C_MKDIR		= 4,
	BTRFS_SEND_C_MKNOD		= 5,
	BTRFS_SEND_C_MKFIFO		= 6,
	BTRFS_SEND_C_MKSOCK		= 7,
	BTRFS_SEND_C_SYMLINK		= 8,

	BTRFS_SEND_C_RENAME		= 9,
	BTRFS_SEND_C_LINK		= 10,
	BTRFS_SEND_C_UNLINK		= 11,
	BTRFS_SEND_C_RMDIR		= 12,

	BTRFS_SEND_C_SET_XATTR		= 13,
	BTRFS_SEND_C_REMOVE_XATTR	= 14,

	BTRFS_SEND_C_WRITE		= 15,
	BTRFS_SEND_C_CLONE		= 16,

	BTRFS_SEND_C_TRUNCATE		= 17,
	BTRFS_SEND_C_CHMOD		= 18,
	BTRFS_SEND_C_CHOWN		= 19,
	BTRFS_SEND_C_UTIMES		= 20,

	BTRFS_SEND_C_END		= 21,
	BTRFS_SEND_C_UPDATE_EXTENT	= 22,
	BTRFS_SEND_C_MAX_V1		= 22,

	/* Version 2 */
	BTRFS_SEND_C_FALLOCATE		= 23,
	BTRFS_SEND_C_FILEATTR		= 24,
	BTRFS_SEND_C_ENCODED_WRITE	= 25,
	BTRFS_SEND_C_MAX_V2		= 25,

	/* Version 3 */
	BTRFS_SEND_C_ENABLE_VERITY	= 26,
	BTRFS_SEND_C_MAX_V3		= 26,
	/* End */
	BTRFS_SEND_C_MAX		= 26,
};

/* attributes in send stream */
enum {
	BTRFS_SEND_A_UNSPEC		= 0,

	/* Version 1 */
	BTRFS_SEND_A_UUID		= 1,
	BTRFS_SEND_A_CTRANSID		= 2,

	BTRFS_SEND_A_INO		= 3,
	BTRFS_SEND_A_SIZE		= 4,
	BTRFS_SEND_A_MODE		= 5,
	BTRFS_SEND_A_UID		= 6,
	BTRFS_SEND_A_GID		= 7,
	BTRFS_SEND_A_RDEV		= 8,
	BTRFS_SEND_A_CTIME		= 9,
	BTRFS_SEND_A_MTIME		= 10,
	BTRFS_SEND_A_ATIME		= 11,
	BTRFS_SEND_A_OTIME		= 12,

	BTRFS_SEND_A_XATTR_NAME		= 13,
	BTRFS_SEND_A_XATTR_DATA		= 14,

	BTRFS_SEND_A_PATH		= 15,
	BTRFS_SEND_A_PATH_TO		= 16,
	BTRFS_SEND_A_PATH_LINK		= 17,

	BTRFS_SEND_A_FILE_OFFSET	= 18,
	/*
	 * As of send stream v2, this attribute is special: it must be the last
	 * attribute in a command, its header contains only the type, and its
	 * length is implicitly the remaining length of the command.
	 */
	BTRFS_SEND_A_DATA		= 19,

	BTRFS_SEND_A_CLONE_UUID		= 20,
	BTRFS_SEND_A_CLONE_CTRANSID	= 21,
	BTRFS_SEND_A_CLONE_PATH		= 22,
	BTRFS_SEND_A_CLONE_OFFSET	= 23,
	BTRFS_SEND_A_CLONE_LEN		= 24,

	BTRFS_SEND_A_MAX_V1		= 24,

	/* Version 2 */
	BTRFS_SEND_A_FALLOCATE_MODE	= 25,

	/*
	 * File attributes from the FS_*_FL namespace (i_flags, xflags),
	 * translated to BTRFS_INODE_* bits (BTRFS_INODE_FLAG_MASK) and stored
	 * in btrfs_inode_item::flags (represented by btrfs_inode::flags and
	 * btrfs_inode::ro_flags).
	 */
	BTRFS_SEND_A_FILEATTR		= 26,

	BTRFS_SEND_A_UNENCODED_FILE_LEN	= 27,
	BTRFS_SEND_A_UNENCODED_LEN	= 28,
	BTRFS_SEND_A_UNENCODED_OFFSET	= 29,
	/*
	 * COMPRESSION and ENCRYPTION default to NONE (0) if omitted from
	 * BTRFS_SEND_C_ENCODED_WRITE.
	 */
	BTRFS_SEND_A_COMPRESSION	= 30,
	BTRFS_SEND_A_ENCRYPTION		= 31,
	BTRFS_SEND_A_MAX_V2		= 31,

	/* Version 3 */
	BTRFS_SEND_A_VERITY_ALGORITHM	= 32,
	BTRFS_SEND_A_VERITY_BLOCK_SIZE	= 33,
	BTRFS_SEND_A_VERITY_SALT_DATA	= 34,
	BTRFS_SEND_A_VERITY_SIG_DATA	= 35,
	BTRFS_SEND_A_MAX_V3		= 35,

	__BTRFS_SEND_A_MAX		= 35,
};

long btrfs_ioctl_send(struct btrfs_inode *inode, const struct btrfs_ioctl_send_args *arg);

#endif