fs/btrfs/send.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2012 Alexander Block.  All rights reserved.
   4  * Copyright (C) 2012 STRATO.  All rights reserved.
   5  */
   6
   7 #ifndef BTRFS_SEND_H
   8 #define BTRFS_SEND_H
   9
  10 #include <linux/types.h>
  11
  12 #define BTRFS_SEND_STREAM_MAGIC "btrfs-stream"
  13 #define BTRFS_SEND_STREAM_VERSION 2
  14
  15 /*
  16  * In send stream v1, no command is larger than 64K. In send stream v2, no limit
  17  * should be assumed.
  18  */
  19 #define BTRFS_SEND_BUF_SIZE_V1                          SZ_64K
  20
  21 struct inode;
  22 struct btrfs_ioctl_send_args;
  23
  24 enum btrfs_tlv_type {
  25         BTRFS_TLV_U8,
  26         BTRFS_TLV_U16,
  27         BTRFS_TLV_U32,
  28         BTRFS_TLV_U64,
  29         BTRFS_TLV_BINARY,
  30         BTRFS_TLV_STRING,
  31         BTRFS_TLV_UUID,
  32         BTRFS_TLV_TIMESPEC,
  33 };
  34
  35 struct btrfs_stream_header {
  36         char magic[sizeof(BTRFS_SEND_STREAM_MAGIC)];
  37         __le32 version;
  38 } __attribute__ ((__packed__));
  39
  40 struct btrfs_cmd_header {
  41         /* len excluding the header */
  42         __le32 len;
  43         __le16 cmd;
  44         /* crc including the header with zero crc field */
  45         __le32 crc;
  46 } __attribute__ ((__packed__));
  47
  48 struct btrfs_tlv_header {
  49         __le16 tlv_type;
  50         /* len excluding the header */
  51         __le16 tlv_len;
  52 } __attribute__ ((__packed__));
  53
  54 /* commands */
  55 enum btrfs_send_cmd {
  56         BTRFS_SEND_C_UNSPEC             = 0,
  57
  58         /* Version 1 */
  59         BTRFS_SEND_C_SUBVOL             = 1,
  60         BTRFS_SEND_C_SNAPSHOT           = 2,
  61
  62         BTRFS_SEND_C_MKFILE             = 3,
  63         BTRFS_SEND_C_MKDIR              = 4,
  64         BTRFS_SEND_C_MKNOD              = 5,
  65         BTRFS_SEND_C_MKFIFO             = 6,
  66         BTRFS_SEND_C_MKSOCK             = 7,
  67         BTRFS_SEND_C_SYMLINK            = 8,
  68
  69         BTRFS_SEND_C_RENAME             = 9,
  70         BTRFS_SEND_C_LINK               = 10,
  71         BTRFS_SEND_C_UNLINK             = 11,
  72         BTRFS_SEND_C_RMDIR              = 12,
  73
  74         BTRFS_SEND_C_SET_XATTR          = 13,
  75         BTRFS_SEND_C_REMOVE_XATTR       = 14,
  76
  77         BTRFS_SEND_C_WRITE              = 15,
  78         BTRFS_SEND_C_CLONE              = 16,
  79
  80         BTRFS_SEND_C_TRUNCATE           = 17,
  81         BTRFS_SEND_C_CHMOD              = 18,
  82         BTRFS_SEND_C_CHOWN              = 19,
  83         BTRFS_SEND_C_UTIMES             = 20,
  84
  85         BTRFS_SEND_C_END                = 21,
  86         BTRFS_SEND_C_UPDATE_EXTENT      = 22,
  87         BTRFS_SEND_C_MAX_V1             = 22,
  88
  89         /* Version 2 */
  90         BTRFS_SEND_C_FALLOCATE          = 23,
  91         BTRFS_SEND_C_FILEATTR           = 24,
  92         BTRFS_SEND_C_ENCODED_WRITE      = 25,
  93         BTRFS_SEND_C_MAX_V2             = 25,
  94
  95         /* End */
  96         BTRFS_SEND_C_MAX                = 25,
  97 };
  98
  99 /* attributes in send stream */
 100 enum {
 101         BTRFS_SEND_A_UNSPEC             = 0,
 102
 103         /* Version 1 */
 104         BTRFS_SEND_A_UUID               = 1,
 105         BTRFS_SEND_A_CTRANSID           = 2,
 106
 107         BTRFS_SEND_A_INO                = 3,
 108         BTRFS_SEND_A_SIZE               = 4,
 109         BTRFS_SEND_A_MODE               = 5,
 110         BTRFS_SEND_A_UID                = 6,
 111         BTRFS_SEND_A_GID                = 7,
 112         BTRFS_SEND_A_RDEV               = 8,
 113         BTRFS_SEND_A_CTIME              = 9,
 114         BTRFS_SEND_A_MTIME              = 10,
 115         BTRFS_SEND_A_ATIME              = 11,
 116         BTRFS_SEND_A_OTIME              = 12,
 117
 118         BTRFS_SEND_A_XATTR_NAME         = 13,
 119         BTRFS_SEND_A_XATTR_DATA         = 14,
 120
 121         BTRFS_SEND_A_PATH               = 15,
 122         BTRFS_SEND_A_PATH_TO            = 16,
 123         BTRFS_SEND_A_PATH_LINK          = 17,
 124
 125         BTRFS_SEND_A_FILE_OFFSET        = 18,
 126         /*
 127          * As of send stream v2, this attribute is special: it must be the last
 128          * attribute in a command, its header contains only the type, and its
 129          * length is implicitly the remaining length of the command.
 130          */
 131         BTRFS_SEND_A_DATA               = 19,
 132
 133         BTRFS_SEND_A_CLONE_UUID         = 20,
 134         BTRFS_SEND_A_CLONE_CTRANSID     = 21,
 135         BTRFS_SEND_A_CLONE_PATH         = 22,
 136         BTRFS_SEND_A_CLONE_OFFSET       = 23,
 137         BTRFS_SEND_A_CLONE_LEN          = 24,
 138
 139         BTRFS_SEND_A_MAX_V1             = 24,
 140
 141         /* Version 2 */
 142         BTRFS_SEND_A_FALLOCATE_MODE     = 25,
 143
 144         /*
 145          * File attributes from the FS_*_FL namespace (i_flags, xflags),
 146          * translated to BTRFS_INODE_* bits (BTRFS_INODE_FLAG_MASK) and stored
 147          * in btrfs_inode_item::flags (represented by btrfs_inode::flags and
 148          * btrfs_inode::ro_flags).
 149          */
 150         BTRFS_SEND_A_FILEATTR           = 26,
 151
 152         BTRFS_SEND_A_UNENCODED_FILE_LEN = 27,
 153         BTRFS_SEND_A_UNENCODED_LEN      = 28,
 154         BTRFS_SEND_A_UNENCODED_OFFSET   = 29,
 155         /*
 156          * COMPRESSION and ENCRYPTION default to NONE (0) if omitted from
 157          * BTRFS_SEND_C_ENCODED_WRITE.
 158          */
 159         BTRFS_SEND_A_COMPRESSION        = 30,
 160         BTRFS_SEND_A_ENCRYPTION         = 31,
 161         BTRFS_SEND_A_MAX_V2             = 31,
 162
 163         /* End */
 164         BTRFS_SEND_A_MAX                = 31,
 165 };
 166
 167 long btrfs_ioctl_send(struct inode *inode, struct btrfs_ioctl_send_args *arg);
 168
 169 #endif