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Btrfs: introduce BTRFS_IOC_SEND for btrfs send/receive

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This patch introduces the BTRFS_IOC_SEND ioctl that is
required for send. It allows btrfs-progs to implement
full and incremental sends. Patches for btrfs-progs will
follow.

Signed-off-by: Alexander Block <ablock84@googlemail.com>
Reviewed-by: David Sterba <dave@jikos.cz>
Reviewed-by: Arne Jansen <sensille@gmx.net>
Reviewed-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
Reviewed-by: Alex Lyakas <alex.bolshoy.btrfs@gmail.com>
This commit is contained in:
Alexander Block
2012-07-25 23:19:24 +02:00
parent 7069830a9e
commit 31db9f7c23
5 changed files with 4717 additions and 1 deletions
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133
fs/btrfs/send.h Normal file
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/*
* Copyright (C) 2012 Alexander Block. All rights reserved.
* Copyright (C) 2012 STRATO. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include "ctree.h"
#define BTRFS_SEND_STREAM_MAGIC "btrfs-stream"
#define BTRFS_SEND_STREAM_VERSION 1
#define BTRFS_SEND_BUF_SIZE (1024 * 64)
#define BTRFS_SEND_READ_SIZE (1024 * 48)
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_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, void __user *arg);
#endif