forked from Minki/linux
38622010a6
Preserve the fs-verity status of a btrfs file across send/recv. There is no facility for installing the Merkle tree contents directly on the receiving filesystem, so we package up the parameters used to enable verity found in the verity descriptor. This gives the receive side enough information to properly enable verity again. Note that this means that receive will have to re-compute the whole Merkle tree, similar to how compression worked before encoded_write. Since the file becomes read-only after verity is enabled, it is important that verity is added to the send stream after any file writes. Therefore, when we process a verity item, merely note that it happened, then actually create the command in the send stream during 'finish_inode_if_needed'. This also creates V3 of the send stream format, without any format changes besides adding the new commands and attributes. Signed-off-by: Boris Burkov <boris@bur.io> Signed-off-by: David Sterba <dsterba@suse.com>
179 lines
4.0 KiB
C
179 lines
4.0 KiB
C
/* 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>
|
|
|
|
#define BTRFS_SEND_STREAM_MAGIC "btrfs-stream"
|
|
#define BTRFS_SEND_STREAM_VERSION 2
|
|
|
|
/*
|
|
* In send stream v1, no command is larger than 64K. In send stream v2, no limit
|
|
* should be assumed.
|
|
*/
|
|
#define BTRFS_SEND_BUF_SIZE_V1 SZ_64K
|
|
|
|
struct inode;
|
|
struct btrfs_ioctl_send_args;
|
|
|
|
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 inode *inode, struct btrfs_ioctl_send_args *arg);
|
|
|
|
#endif
|