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There are file attributes inherited from previous ext2 SETFLAGS/GETFLAGS and later from XFLAGS interfaces, now commonly found under the 'fileattr' API. This corresponds to the individual inode bits and that's part of the on-disk format, so this is suitable for the protocol. The other interfaces contain a lot of cruft or bits that btrfs does not support yet. Currently the value is u64 and matches btrfs_inode_item. Not all the bits can be set by ioctls (like NODATASUM or READONLY), but we can send them over the protocol and leave it up to the receiving side what and how to apply. As some of the flags, eg. IMMUTABLE, can prevent any further changes, the receiving side needs to understand that and apply the changes in the right order, or possibly with some intermediate steps. This should be easier, future proof and simpler on the protocol layer than implementing in kernel. Reviewed-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
169 lines
3.7 KiB
C
169 lines
3.7 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 <linux/types.h>
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#define BTRFS_SEND_STREAM_MAGIC "btrfs-stream"
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#define BTRFS_SEND_STREAM_VERSION 2
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/*
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* In send stream v1, no command is larger than 64K. In send stream v2, no limit
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* should be assumed.
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*/
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#define BTRFS_SEND_BUF_SIZE_V1 SZ_64K
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struct inode;
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struct btrfs_ioctl_send_args;
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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 = 0,
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/* Version 1 */
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BTRFS_SEND_C_SUBVOL = 1,
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BTRFS_SEND_C_SNAPSHOT = 2,
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BTRFS_SEND_C_MKFILE = 3,
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BTRFS_SEND_C_MKDIR = 4,
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BTRFS_SEND_C_MKNOD = 5,
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BTRFS_SEND_C_MKFIFO = 6,
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BTRFS_SEND_C_MKSOCK = 7,
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BTRFS_SEND_C_SYMLINK = 8,
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BTRFS_SEND_C_RENAME = 9,
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BTRFS_SEND_C_LINK = 10,
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BTRFS_SEND_C_UNLINK = 11,
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BTRFS_SEND_C_RMDIR = 12,
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BTRFS_SEND_C_SET_XATTR = 13,
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BTRFS_SEND_C_REMOVE_XATTR = 14,
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BTRFS_SEND_C_WRITE = 15,
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BTRFS_SEND_C_CLONE = 16,
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BTRFS_SEND_C_TRUNCATE = 17,
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BTRFS_SEND_C_CHMOD = 18,
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BTRFS_SEND_C_CHOWN = 19,
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BTRFS_SEND_C_UTIMES = 20,
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BTRFS_SEND_C_END = 21,
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BTRFS_SEND_C_UPDATE_EXTENT = 22,
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BTRFS_SEND_C_MAX_V1 = 22,
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/* Version 2 */
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BTRFS_SEND_C_FALLOCATE = 23,
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BTRFS_SEND_C_FILEATTR = 24,
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BTRFS_SEND_C_ENCODED_WRITE = 25,
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BTRFS_SEND_C_MAX_V2 = 25,
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/* End */
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BTRFS_SEND_C_MAX = 25,
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};
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/* attributes in send stream */
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enum {
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BTRFS_SEND_A_UNSPEC = 0,
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/* Version 1 */
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BTRFS_SEND_A_UUID = 1,
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BTRFS_SEND_A_CTRANSID = 2,
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BTRFS_SEND_A_INO = 3,
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BTRFS_SEND_A_SIZE = 4,
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BTRFS_SEND_A_MODE = 5,
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BTRFS_SEND_A_UID = 6,
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BTRFS_SEND_A_GID = 7,
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BTRFS_SEND_A_RDEV = 8,
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BTRFS_SEND_A_CTIME = 9,
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BTRFS_SEND_A_MTIME = 10,
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BTRFS_SEND_A_ATIME = 11,
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BTRFS_SEND_A_OTIME = 12,
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BTRFS_SEND_A_XATTR_NAME = 13,
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BTRFS_SEND_A_XATTR_DATA = 14,
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BTRFS_SEND_A_PATH = 15,
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BTRFS_SEND_A_PATH_TO = 16,
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BTRFS_SEND_A_PATH_LINK = 17,
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BTRFS_SEND_A_FILE_OFFSET = 18,
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/*
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* As of send stream v2, this attribute is special: it must be the last
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* attribute in a command, its header contains only the type, and its
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* length is implicitly the remaining length of the command.
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*/
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BTRFS_SEND_A_DATA = 19,
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BTRFS_SEND_A_CLONE_UUID = 20,
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BTRFS_SEND_A_CLONE_CTRANSID = 21,
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BTRFS_SEND_A_CLONE_PATH = 22,
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BTRFS_SEND_A_CLONE_OFFSET = 23,
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BTRFS_SEND_A_CLONE_LEN = 24,
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BTRFS_SEND_A_MAX_V1 = 24,
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/* Version 2 */
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BTRFS_SEND_A_FALLOCATE_MODE = 25,
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/*
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* File attributes from the FS_*_FL namespace (i_flags, xflags),
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* translated to BTRFS_INODE_* bits (BTRFS_INODE_FLAG_MASK) and stored
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* in btrfs_inode_item::flags (represented by btrfs_inode::flags and
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* btrfs_inode::ro_flags).
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*/
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BTRFS_SEND_A_FILEATTR = 26,
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BTRFS_SEND_A_UNENCODED_FILE_LEN = 27,
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BTRFS_SEND_A_UNENCODED_LEN = 28,
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BTRFS_SEND_A_UNENCODED_OFFSET = 29,
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/*
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* COMPRESSION and ENCRYPTION default to NONE (0) if omitted from
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* BTRFS_SEND_C_ENCODED_WRITE.
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*/
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BTRFS_SEND_A_COMPRESSION = 30,
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BTRFS_SEND_A_ENCRYPTION = 31,
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BTRFS_SEND_A_MAX_V2 = 31,
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/* End */
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BTRFS_SEND_A_MAX = 31,
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};
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long btrfs_ioctl_send(struct inode *inode, struct btrfs_ioctl_send_args *arg);
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#endif
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