Btrfs: introduce BTRFS_IOC_SEND for btrfs send/receive (31db9f7c) · Commits · 戴 / test

fs/btrfs/Makefile

+1 −1

Original line number	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 \
		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 \
		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_CHECK_INTEGRITY) += check-integrity.o

fs/btrfs/ioctl.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -54,6 +54,7 @@
		#include "inode-map.h"
		#include "backref.h"
		#include "rcu-string.h"
		#include "send.h"

		/* Mask out flags that are inappropriate for the given type of inode. */
		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);
		case BTRFS_IOC_SET_RECEIVED_SUBVOL:
		return btrfs_ioctl_set_received_subvol(file, argp);
		case BTRFS_IOC_SEND:
		return btrfs_ioctl_send(file, argp);
		case BTRFS_IOC_GET_DEV_STATS:
		return btrfs_ioctl_get_dev_stats(root, argp, 0);
		case BTRFS_IOC_GET_AND_RESET_DEV_STATS:

fs/btrfs/ioctl.h

+10 −0

Original line number	Diff line number	Diff line
		@@ -310,6 +310,15 @@ struct btrfs_ioctl_received_subvol_args {
		__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, \
		struct btrfs_ioctl_vol_args)
		#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)
		#define BTRFS_IOC_SET_RECEIVED_SUBVOL _IOWR(BTRFS_IOCTL_MAGIC, 37, \
		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, \
		struct btrfs_ioctl_get_dev_stats)
		#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	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

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