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Commit 31db9f7c authored by Alexander Block's avatar Alexander Block
Browse files

Btrfs: introduce BTRFS_IOC_SEND for btrfs send/receive 



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: default avatarAlexander Block <ablock84@googlemail.com>
Reviewed-by: default avatarDavid Sterba <dave@jikos.cz>
Reviewed-by: default avatarArne Jansen <sensille@gmx.net>
Reviewed-by: default avatarJan Schmidt <list.btrfs@jan-o-sch.net>
Reviewed-by: default avatarAlex Lyakas <alex.bolshoy.btrfs@gmail.com>
parent 7069830a

fs/btrfs/Makefile

+1 −1
Original line number Original line Diff line number Diff line
@@ -8,7 +8,7 @@ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \ 
	   extent_io.o volumes.o async-thread.o ioctl.o locking.o orphan.o \

	   extent_io.o volumes.o async-thread.o ioctl.o locking.o orphan.o \

	   export.o tree-log.o free-space-cache.o zlib.o lzo.o \

	   export.o tree-log.o free-space-cache.o zlib.o lzo.o \

	   compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o \

	   compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o \

	   reada.o backref.o ulist.o

	   reada.o backref.o ulist.o send.o





btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o

btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o

btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o
 
btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o

fs/btrfs/ioctl.c

+3 −0
Original line number Original line Diff line number Diff line
@@ -54,6 +54,7 @@ 
#include "inode-map.h"

#include "inode-map.h"

#include "backref.h"

#include "backref.h"

#include "rcu-string.h"

#include "rcu-string.h"

#include "send.h"





/* Mask out flags that are inappropriate for the given type of inode. */

/* Mask out flags that are inappropriate for the given type of inode. */

static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)

static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
@@ -3571,6 +3572,8 @@ long btrfs_ioctl(struct file *file, unsigned int 
		return btrfs_ioctl_balance_progress(root, argp);

		return btrfs_ioctl_balance_progress(root, argp);

	case BTRFS_IOC_SET_RECEIVED_SUBVOL:

	case BTRFS_IOC_SET_RECEIVED_SUBVOL:

		return btrfs_ioctl_set_received_subvol(file, argp);

		return btrfs_ioctl_set_received_subvol(file, argp);

	case BTRFS_IOC_SEND:

		return btrfs_ioctl_send(file, argp);

	case BTRFS_IOC_GET_DEV_STATS:

	case BTRFS_IOC_GET_DEV_STATS:

		return btrfs_ioctl_get_dev_stats(root, argp, 0);

		return btrfs_ioctl_get_dev_stats(root, argp, 0);

	case BTRFS_IOC_GET_AND_RESET_DEV_STATS:

	case BTRFS_IOC_GET_AND_RESET_DEV_STATS:

fs/btrfs/ioctl.h

+10 −0
Original line number Original line Diff line number Diff line
@@ -310,6 +310,15 @@ struct btrfs_ioctl_received_subvol_args { 
	__u64	reserved[16];		/* in */

	__u64	reserved[16];		/* in */

};

};





struct btrfs_ioctl_send_args {

	__s64 send_fd;			/* in */

	__u64 clone_sources_count;	/* in */

	__u64 __user *clone_sources;	/* in */

	__u64 parent_root;		/* in */

	__u64 flags;			/* in */

	__u64 reserved[4];		/* in */

};



#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \

#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \

				   struct btrfs_ioctl_vol_args)

				   struct btrfs_ioctl_vol_args)

#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \

#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
@@ -376,6 +385,7 @@ struct btrfs_ioctl_received_subvol_args { 
					struct btrfs_ioctl_ino_path_args)

					struct btrfs_ioctl_ino_path_args)

#define BTRFS_IOC_SET_RECEIVED_SUBVOL _IOWR(BTRFS_IOCTL_MAGIC, 37, \

#define BTRFS_IOC_SET_RECEIVED_SUBVOL _IOWR(BTRFS_IOCTL_MAGIC, 37, \

				struct btrfs_ioctl_received_subvol_args)

				struct btrfs_ioctl_received_subvol_args)

#define BTRFS_IOC_SEND _IOW(BTRFS_IOCTL_MAGIC, 38, struct btrfs_ioctl_send_args)

#define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \

#define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \

				      struct btrfs_ioctl_get_dev_stats)

				      struct btrfs_ioctl_get_dev_stats)

#define BTRFS_IOC_GET_AND_RESET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 53, \

#define BTRFS_IOC_GET_AND_RESET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 53, \

fs/btrfs/send.c

0 → 100644
+4570 −0

File added.

Preview size limit exceeded, changes collapsed.

fs/btrfs/send.h

0 → 100644
+133 −0
Original line number Original line Diff line number Diff line 
/*

 * 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