mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 08:44:21 +08:00
8c7d9fe06f
send_write() currently copies from the page cache to sctx->read_buf, and then from sctx->read_buf to sctx->send_buf. Similarly, send_hole() zeroes sctx->read_buf and then copies from sctx->read_buf to sctx->send_buf. However, if we write the TLV header manually, we can copy to sctx->send_buf directly and get rid of sctx->read_buf. Reviewed-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
126 lines
2.3 KiB
C
126 lines
2.3 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 "ctree.h"
|
|
|
|
#define BTRFS_SEND_STREAM_MAGIC "btrfs-stream"
|
|
#define BTRFS_SEND_STREAM_VERSION 1
|
|
|
|
#define BTRFS_SEND_BUF_SIZE SZ_64K
|
|
|
|
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_UPDATE_EXTENT,
|
|
__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, struct btrfs_ioctl_send_args *arg);
|
|
#endif
|
|
|
|
#endif
|