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This is preparatory work for send protocol update to version 2 and higher. We have many pending protocol update requests but still don't have the basic protocol rev in place, the first thing that must happen is to do the actual versioning support. The protocol version is u32 and is a new member in the send ioctl struct. Validity of the version field is backed by a new flag bit. Old kernels would fail when a higher version is requested. Version protocol 0 will pick the highest supported version, BTRFS_SEND_STREAM_VERSION, that's also exported in sysfs. The version is still unchanged and will be increased once we have new incompatible commands or stream updates. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
133 lines
2.4 KiB
C
133 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2012 Alexander Block. All rights reserved.
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* Copyright (C) 2012 STRATO. All rights reserved.
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*/
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#ifndef BTRFS_SEND_H
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#define BTRFS_SEND_H
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#include "ctree.h"
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#define BTRFS_SEND_STREAM_MAGIC "btrfs-stream"
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#define BTRFS_SEND_STREAM_VERSION 1
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#define BTRFS_SEND_BUF_SIZE SZ_64K
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enum btrfs_tlv_type {
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BTRFS_TLV_U8,
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BTRFS_TLV_U16,
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BTRFS_TLV_U32,
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BTRFS_TLV_U64,
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BTRFS_TLV_BINARY,
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BTRFS_TLV_STRING,
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BTRFS_TLV_UUID,
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BTRFS_TLV_TIMESPEC,
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};
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struct btrfs_stream_header {
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char magic[sizeof(BTRFS_SEND_STREAM_MAGIC)];
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__le32 version;
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} __attribute__ ((__packed__));
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struct btrfs_cmd_header {
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/* len excluding the header */
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__le32 len;
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__le16 cmd;
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/* crc including the header with zero crc field */
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__le32 crc;
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} __attribute__ ((__packed__));
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struct btrfs_tlv_header {
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__le16 tlv_type;
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/* len excluding the header */
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__le16 tlv_len;
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} __attribute__ ((__packed__));
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/* commands */
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enum btrfs_send_cmd {
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BTRFS_SEND_C_UNSPEC,
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/* Version 1 */
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BTRFS_SEND_C_SUBVOL,
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BTRFS_SEND_C_SNAPSHOT,
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BTRFS_SEND_C_MKFILE,
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BTRFS_SEND_C_MKDIR,
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BTRFS_SEND_C_MKNOD,
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BTRFS_SEND_C_MKFIFO,
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BTRFS_SEND_C_MKSOCK,
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BTRFS_SEND_C_SYMLINK,
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BTRFS_SEND_C_RENAME,
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BTRFS_SEND_C_LINK,
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BTRFS_SEND_C_UNLINK,
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BTRFS_SEND_C_RMDIR,
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BTRFS_SEND_C_SET_XATTR,
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BTRFS_SEND_C_REMOVE_XATTR,
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BTRFS_SEND_C_WRITE,
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BTRFS_SEND_C_CLONE,
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BTRFS_SEND_C_TRUNCATE,
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BTRFS_SEND_C_CHMOD,
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BTRFS_SEND_C_CHOWN,
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BTRFS_SEND_C_UTIMES,
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BTRFS_SEND_C_END,
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BTRFS_SEND_C_UPDATE_EXTENT,
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__BTRFS_SEND_C_MAX_V1,
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/* Version 2 */
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__BTRFS_SEND_C_MAX_V2,
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/* End */
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__BTRFS_SEND_C_MAX,
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};
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#define BTRFS_SEND_C_MAX (__BTRFS_SEND_C_MAX - 1)
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/* attributes in send stream */
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enum {
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BTRFS_SEND_A_UNSPEC,
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BTRFS_SEND_A_UUID,
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BTRFS_SEND_A_CTRANSID,
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BTRFS_SEND_A_INO,
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BTRFS_SEND_A_SIZE,
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BTRFS_SEND_A_MODE,
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BTRFS_SEND_A_UID,
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BTRFS_SEND_A_GID,
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BTRFS_SEND_A_RDEV,
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BTRFS_SEND_A_CTIME,
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BTRFS_SEND_A_MTIME,
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BTRFS_SEND_A_ATIME,
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BTRFS_SEND_A_OTIME,
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BTRFS_SEND_A_XATTR_NAME,
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BTRFS_SEND_A_XATTR_DATA,
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BTRFS_SEND_A_PATH,
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BTRFS_SEND_A_PATH_TO,
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BTRFS_SEND_A_PATH_LINK,
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BTRFS_SEND_A_FILE_OFFSET,
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BTRFS_SEND_A_DATA,
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BTRFS_SEND_A_CLONE_UUID,
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BTRFS_SEND_A_CLONE_CTRANSID,
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BTRFS_SEND_A_CLONE_PATH,
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BTRFS_SEND_A_CLONE_OFFSET,
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BTRFS_SEND_A_CLONE_LEN,
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__BTRFS_SEND_A_MAX,
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};
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#define BTRFS_SEND_A_MAX (__BTRFS_SEND_A_MAX - 1)
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#ifdef __KERNEL__
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long btrfs_ioctl_send(struct file *mnt_file, struct btrfs_ioctl_send_args *arg);
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#endif
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#endif
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