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btrfs-progs/ioctl.h
Stefan Behrens 6315410f25 Btrfs-progs: add send option for using new end-cmd semantic 
This commit adds a command line option to enable sending streams
which make use of the new end-cmd semantic if multiple snapshots are
sent back-to-back. The goal is to use the <end cmd> as an indication
to stop reading the input stream. So far, the receiver could only
use EOF to recognize the end.

If the new command line option '-e' is set, this commit requires a
kernel which is able to support the new flags in the send ioctl. New
bits in the flags of the send ioctl will be set which cause EINVAL
on old kernels. However, if the option '-e' is not set, it works
with old and new kernels without any errors or any changed behavior.

This used to be the encoding (with 2 snapshots in this example):
<stream header> + <sequence of commands> + <end cmd> +
<stream header> + <sequence of commands> + <end cmd> + EOF

The new format (if the two new flags are used) is this one:
<stream header> + <sequence of commands> +
                  <sequence of commands> + <end cmd>

Note that the currently existing receivers treat <end cmd> only as
an indication that a new <stream header> is following. This means,
you can just skip the sequence <end cmd> <stream header> without
loosing compatibility. As long as an EOF is following, the currently
existing receivers handle the new format (if the two new flags are
used) exactly as the old one.

Also note that the kernel interface was changed in a way that is
backward compatible to old btrfs-progs tools. You set one or two bits
in the flags field of the ioctl to enable the new behavior. Old tools
set these flags to zero, thus getting exactly the same as they got
with older kernels. And this is exactly what happens if the new '-e'
option is not set, the new bits in the flags are not set and thus
old kernels and new kernels are both supported.

So what is the benefit of this change? The goal is to be able to use
a single stream (one TCP connection) to multiplex a request/response
handshake plus Btrfs send streams, all in the same stream. In this
case you cannot evaluate an EOF condition as an end of the Btrfs send
stream. You need something else, and the <end cmd> is just perfect
for this purpose.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-08-09 14:32:29 +02:00

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/*
* Copyright (C) 2007 Oracle. 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.
*/
#ifndef __IOCTL_
#define __IOCTL_
#include <asm/types.h>
#include <linux/ioctl.h>
#include <time.h>
#ifdef __cplusplus
extern "C" {
#endif
#define BTRFS_IOCTL_MAGIC 0x94
#define BTRFS_VOL_NAME_MAX 255
/* this should be 4k */
#define BTRFS_PATH_NAME_MAX 4087
struct btrfs_ioctl_vol_args {
__s64 fd;
char name[BTRFS_PATH_NAME_MAX + 1];
};
#define BTRFS_DEVICE_PATH_NAME_MAX 1024
#define BTRFS_SUBVOL_CREATE_ASYNC (1ULL << 0)
#define BTRFS_SUBVOL_RDONLY (1ULL << 1)
#define BTRFS_SUBVOL_QGROUP_INHERIT (1ULL << 2)
#define BTRFS_QGROUP_INHERIT_SET_LIMITS (1ULL << 0)
struct btrfs_qgroup_limit {
__u64 flags;
__u64 max_referenced;
__u64 max_exclusive;
__u64 rsv_referenced;
__u64 rsv_exclusive;
};
struct btrfs_qgroup_inherit {
__u64 flags;
__u64 num_qgroups;
__u64 num_ref_copies;
__u64 num_excl_copies;
struct btrfs_qgroup_limit lim;
__u64 qgroups[0];
};
struct btrfs_ioctl_qgroup_limit_args {
__u64 qgroupid;
struct btrfs_qgroup_limit lim;
};
#define BTRFS_SUBVOL_NAME_MAX 4039
struct btrfs_ioctl_vol_args_v2 {
__s64 fd;
__u64 transid;
__u64 flags;
union {
struct {
__u64 size;
struct btrfs_qgroup_inherit *qgroup_inherit;
};
__u64 unused[4];
};
char name[BTRFS_SUBVOL_NAME_MAX + 1];
};
#define BTRFS_FSID_SIZE 16
#define BTRFS_UUID_SIZE 16
struct btrfs_scrub_progress {
__u64 data_extents_scrubbed;
__u64 tree_extents_scrubbed;
__u64 data_bytes_scrubbed;
__u64 tree_bytes_scrubbed;
__u64 read_errors;
__u64 csum_errors;
__u64 verify_errors;
__u64 no_csum;
__u64 csum_discards;
__u64 super_errors;
__u64 malloc_errors;
__u64 uncorrectable_errors;
__u64 corrected_errors;
__u64 last_physical;
__u64 unverified_errors;
};
#define BTRFS_SCRUB_READONLY 1
struct btrfs_ioctl_scrub_args {
__u64 devid; /* in */
__u64 start; /* in */
__u64 end; /* in */
__u64 flags; /* in */
struct btrfs_scrub_progress progress; /* out */
/* pad to 1k */
__u64 unused[(1024-32-sizeof(struct btrfs_scrub_progress))/8];
};
#define BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS 0
#define BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID 1
struct btrfs_ioctl_dev_replace_start_params {
__u64 srcdevid; /* in, if 0, use srcdev_name instead */
__u64 cont_reading_from_srcdev_mode; /* in, see #define
* above */
__u8 srcdev_name[BTRFS_DEVICE_PATH_NAME_MAX + 1]; /* in */
__u8 tgtdev_name[BTRFS_DEVICE_PATH_NAME_MAX + 1]; /* in */
};
#define BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED 0
#define BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED 1
#define BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED 2
#define BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED 3
#define BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED 4
struct btrfs_ioctl_dev_replace_status_params {
__u64 replace_state; /* out, see #define above */
__u64 progress_1000; /* out, 0 <= x <= 1000 */
__u64 time_started; /* out, seconds since 1-Jan-1970 */
__u64 time_stopped; /* out, seconds since 1-Jan-1970 */
__u64 num_write_errors; /* out */
__u64 num_uncorrectable_read_errors; /* out */
};
#define BTRFS_IOCTL_DEV_REPLACE_CMD_START 0
#define BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS 1
#define BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL 2
#define BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR 0
#define BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED 1
#define BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED 2
struct btrfs_ioctl_dev_replace_args {
__u64 cmd; /* in */
__u64 result; /* out */
union {
struct btrfs_ioctl_dev_replace_start_params start;
struct btrfs_ioctl_dev_replace_status_params status;
}; /* in/out */
__u64 spare[64];
};
struct btrfs_ioctl_dev_info_args {
__u64 devid; /* in/out */
__u8 uuid[BTRFS_UUID_SIZE]; /* in/out */
__u64 bytes_used; /* out */
__u64 total_bytes; /* out */
__u64 unused[379]; /* pad to 4k */
__u8 path[BTRFS_DEVICE_PATH_NAME_MAX]; /* out */
};
struct btrfs_ioctl_fs_info_args {
__u64 max_id; /* out */
__u64 num_devices; /* out */
__u8 fsid[BTRFS_FSID_SIZE]; /* out */
__u64 reserved[124]; /* pad to 1k */
};
/* balance control ioctl modes */
#define BTRFS_BALANCE_CTL_PAUSE 1
#define BTRFS_BALANCE_CTL_CANCEL 2
#define BTRFS_BALANCE_CTL_RESUME 3
/*
* this is packed, because it should be exactly the same as its disk
* byte order counterpart (struct btrfs_disk_balance_args)
*/
struct btrfs_balance_args {
__u64 profiles;
__u64 usage;
__u64 devid;
__u64 pstart;
__u64 pend;
__u64 vstart;
__u64 vend;
__u64 target;
__u64 flags;
__u64 unused[8];
} __attribute__ ((__packed__));
struct btrfs_balance_progress {
__u64 expected;
__u64 considered;
__u64 completed;
};
#define BTRFS_BALANCE_STATE_RUNNING (1ULL << 0)
#define BTRFS_BALANCE_STATE_PAUSE_REQ (1ULL << 1)
#define BTRFS_BALANCE_STATE_CANCEL_REQ (1ULL << 2)
struct btrfs_ioctl_balance_args {
__u64 flags; /* in/out */
__u64 state; /* out */
struct btrfs_balance_args data; /* in/out */
struct btrfs_balance_args meta; /* in/out */
struct btrfs_balance_args sys; /* in/out */
struct btrfs_balance_progress stat; /* out */
__u64 unused[72]; /* pad to 1k */
};
struct btrfs_ioctl_search_key {
/* which root are we searching. 0 is the tree of tree roots */
__u64 tree_id;
/* keys returned will be >= min and <= max */
__u64 min_objectid;
__u64 max_objectid;
/* keys returned will be >= min and <= max */
__u64 min_offset;
__u64 max_offset;
/* max and min transids to search for */
__u64 min_transid;
__u64 max_transid;
/* keys returned will be >= min and <= max */
__u32 min_type;
__u32 max_type;
/*
* how many items did userland ask for, and how many are we
* returning
*/
__u32 nr_items;
/* align to 64 bits */
__u32 unused;
/* some extra for later */
__u64 unused1;
__u64 unused2;
__u64 unused3;
__u64 unused4;
};
struct btrfs_ioctl_search_header {
__u64 transid;
__u64 objectid;
__u64 offset;
__u32 type;
__u32 len;
} __attribute__((may_alias));
#define BTRFS_SEARCH_ARGS_BUFSIZE (4096 - sizeof(struct btrfs_ioctl_search_key))
/*
* the buf is an array of search headers where
* each header is followed by the actual item
* the type field is expanded to 32 bits for alignment
*/
struct btrfs_ioctl_search_args {
struct btrfs_ioctl_search_key key;
char buf[BTRFS_SEARCH_ARGS_BUFSIZE];
};
#define BTRFS_INO_LOOKUP_PATH_MAX 4080
struct btrfs_ioctl_ino_lookup_args {
__u64 treeid;
__u64 objectid;
char name[BTRFS_INO_LOOKUP_PATH_MAX];
};
/* flags for the defrag range ioctl */
#define BTRFS_DEFRAG_RANGE_COMPRESS 1
#define BTRFS_DEFRAG_RANGE_START_IO 2
struct btrfs_ioctl_defrag_range_args {
/* start of the defrag operation */
__u64 start;
/* number of bytes to defrag, use (u64)-1 to say all */
__u64 len;
/*
* flags for the operation, which can include turning
* on compression for this one defrag
*/
__u64 flags;
/*
* any extent bigger than this will be considered
* already defragged. Use 0 to take the kernel default
* Use 1 to say every single extent must be rewritten
*/
__u32 extent_thresh;
/*
* which compression method to use if turning on compression
* for this defrag operation. If unspecified, zlib will
* be used
*/
__u32 compress_type;
/* spare for later */
__u32 unused[4];
};
struct btrfs_ioctl_space_info {
__u64 flags;
__u64 total_bytes;
__u64 used_bytes;
};
struct btrfs_ioctl_space_args {
__u64 space_slots;
__u64 total_spaces;
struct btrfs_ioctl_space_info spaces[0];
};
struct btrfs_data_container {
__u32 bytes_left; /* out -- bytes not needed to deliver output */
__u32 bytes_missing; /* out -- additional bytes needed for result */
__u32 elem_cnt; /* out */
__u32 elem_missed; /* out */
__u64 val[0]; /* out */
};
struct btrfs_ioctl_ino_path_args {
__u64 inum; /* in */
__u64 size; /* in */
__u64 reserved[4];
/* struct btrfs_data_container *fspath; out */
__u64 fspath; /* out */
};
struct btrfs_ioctl_logical_ino_args {
__u64 logical; /* in */
__u64 size; /* in */
__u64 reserved[4];
/* struct btrfs_data_container *inodes; out */
__u64 inodes;
};
struct btrfs_ioctl_timespec {
__u64 sec;
__u32 nsec;
};
struct btrfs_ioctl_received_subvol_args {
char uuid[BTRFS_UUID_SIZE]; /* in */
__u64 stransid; /* in */
__u64 rtransid; /* out */
struct btrfs_ioctl_timespec stime; /* in */
struct btrfs_ioctl_timespec rtime; /* out */
__u64 flags; /* in */
__u64 reserved[16]; /* in */
};
/*
* Caller doesn't want file data in the send stream, even if the
* search of clone sources doesn't find an extent. UPDATE_EXTENT
* commands will be sent instead of WRITE commands.
*/
#define BTRFS_SEND_FLAG_NO_FILE_DATA 0x1
/*
* Do not add the leading stream header. Used when multiple snapshots
* are sent back to back.
*/
#define BTRFS_SEND_FLAG_OMIT_STREAM_HEADER 0x2
/*
* Omit the command at the end of the stream that indicated the end
* of the stream. This option is used when multiple snapshots are
* sent back to back.
*/
#define BTRFS_SEND_FLAG_OMIT_END_CMD 0x4
struct btrfs_ioctl_send_args {
__s64 send_fd; /* in */
__u64 clone_sources_count; /* in */
__u64 *clone_sources; /* in */
__u64 parent_root; /* in */
__u64 flags; /* in */
__u64 reserved[4]; /* in */
};
enum btrfs_dev_stat_values {
/* disk I/O failure stats */
BTRFS_DEV_STAT_WRITE_ERRS, /* EIO or EREMOTEIO from lower layers */
BTRFS_DEV_STAT_READ_ERRS, /* EIO or EREMOTEIO from lower layers */
BTRFS_DEV_STAT_FLUSH_ERRS, /* EIO or EREMOTEIO from lower layers */
/* stats for indirect indications for I/O failures */
BTRFS_DEV_STAT_CORRUPTION_ERRS, /* checksum error, bytenr error or
* contents is illegal: this is an
* indication that the block was damaged
* during read or write, or written to
* wrong location or read from wrong
* location */
BTRFS_DEV_STAT_GENERATION_ERRS, /* an indication that blocks have not
* been written */
BTRFS_DEV_STAT_VALUES_MAX
};
/* Reset statistics after reading; needs SYS_ADMIN capability */
#define BTRFS_DEV_STATS_RESET (1ULL << 0)
struct btrfs_ioctl_get_dev_stats {
__u64 devid; /* in */
__u64 nr_items; /* in/out */
__u64 flags; /* in/out */
/* out values: */
__u64 values[BTRFS_DEV_STAT_VALUES_MAX];
__u64 unused[128 - 2 - BTRFS_DEV_STAT_VALUES_MAX]; /* pad to 1k */
};
/* BTRFS_IOC_SNAP_CREATE is no longer used by the btrfs command */
#define BTRFS_QUOTA_CTL_ENABLE 1
#define BTRFS_QUOTA_CTL_DISABLE 2
/* 3 has formerly been reserved for BTRFS_QUOTA_CTL_RESCAN */
struct btrfs_ioctl_quota_ctl_args {
__u64 cmd;
__u64 status;
};
struct btrfs_ioctl_quota_rescan_args {
__u64 flags;
__u64 progress;
__u64 reserved[6];
};
struct btrfs_ioctl_qgroup_assign_args {
__u64 assign;
__u64 src;
__u64 dst;
};
struct btrfs_ioctl_qgroup_create_args {
__u64 create;
__u64 qgroupid;
};
#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_RESIZE _IOW(BTRFS_IOCTL_MAGIC, 3, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_SCAN_DEV _IOW(BTRFS_IOCTL_MAGIC, 4, \
struct btrfs_ioctl_vol_args)
struct btrfs_ioctl_clone_range_args {
__s64 src_fd;
__u64 src_offset, src_length;
__u64 dest_offset;
};
/* trans start and trans end are dangerous, and only for
* use by applications that know how to avoid the
* resulting deadlocks
*/
#define BTRFS_IOC_TRANS_START _IO(BTRFS_IOCTL_MAGIC, 6)
#define BTRFS_IOC_TRANS_END _IO(BTRFS_IOCTL_MAGIC, 7)
#define BTRFS_IOC_SYNC _IO(BTRFS_IOCTL_MAGIC, 8)
#define BTRFS_IOC_CLONE _IOW(BTRFS_IOCTL_MAGIC, 9, int)
#define BTRFS_IOC_ADD_DEV _IOW(BTRFS_IOCTL_MAGIC, 10, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_RM_DEV _IOW(BTRFS_IOCTL_MAGIC, 11, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_BALANCE _IOW(BTRFS_IOCTL_MAGIC, 12, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_CLONE_RANGE _IOW(BTRFS_IOCTL_MAGIC, 13, \
struct btrfs_ioctl_clone_range_args)
#define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_DEFRAG_RANGE _IOW(BTRFS_IOCTL_MAGIC, 16, \
struct btrfs_ioctl_defrag_range_args)
#define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \
struct btrfs_ioctl_search_args)
#define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
struct btrfs_ioctl_ino_lookup_args)
#define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
#define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \
struct btrfs_ioctl_space_args)
#define BTRFS_IOC_SNAP_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 23, \
struct btrfs_ioctl_vol_args_v2)
#define BTRFS_IOC_SUBVOL_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 24, \
struct btrfs_ioctl_vol_args_v2)
#define BTRFS_IOC_SUBVOL_GETFLAGS _IOR(BTRFS_IOCTL_MAGIC, 25, __u64)
#define BTRFS_IOC_SUBVOL_SETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 26, __u64)
#define BTRFS_IOC_SCRUB _IOWR(BTRFS_IOCTL_MAGIC, 27, \
struct btrfs_ioctl_scrub_args)
#define BTRFS_IOC_SCRUB_CANCEL _IO(BTRFS_IOCTL_MAGIC, 28)
#define BTRFS_IOC_SCRUB_PROGRESS _IOWR(BTRFS_IOCTL_MAGIC, 29, \
struct btrfs_ioctl_scrub_args)
#define BTRFS_IOC_DEV_INFO _IOWR(BTRFS_IOCTL_MAGIC, 30, \
struct btrfs_ioctl_dev_info_args)
#define BTRFS_IOC_FS_INFO _IOR(BTRFS_IOCTL_MAGIC, 31, \
struct btrfs_ioctl_fs_info_args)
#define BTRFS_IOC_BALANCE_V2 _IOWR(BTRFS_IOCTL_MAGIC, 32, \
struct btrfs_ioctl_balance_args)
#define BTRFS_IOC_BALANCE_CTL _IOW(BTRFS_IOCTL_MAGIC, 33, int)
#define BTRFS_IOC_BALANCE_PROGRESS _IOR(BTRFS_IOCTL_MAGIC, 34, \
struct btrfs_ioctl_balance_args)
#define BTRFS_IOC_INO_PATHS _IOWR(BTRFS_IOCTL_MAGIC, 35, \
struct btrfs_ioctl_ino_path_args)
#define BTRFS_IOC_LOGICAL_INO _IOWR(BTRFS_IOCTL_MAGIC, 36, \
struct btrfs_ioctl_ino_path_args)
#define BTRFS_IOC_DEVICES_READY _IOR(BTRFS_IOCTL_MAGIC, 39, \
struct btrfs_ioctl_vol_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_QUOTA_CTL _IOWR(BTRFS_IOCTL_MAGIC, 40, \
struct btrfs_ioctl_quota_ctl_args)
#define BTRFS_IOC_QGROUP_ASSIGN _IOW(BTRFS_IOCTL_MAGIC, 41, \
struct btrfs_ioctl_qgroup_assign_args)
#define BTRFS_IOC_QGROUP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 42, \
struct btrfs_ioctl_qgroup_create_args)
#define BTRFS_IOC_QGROUP_LIMIT _IOR(BTRFS_IOCTL_MAGIC, 43, \
struct btrfs_ioctl_qgroup_limit_args)
#define BTRFS_IOC_QUOTA_RESCAN _IOW(BTRFS_IOCTL_MAGIC, 44, \
struct btrfs_ioctl_quota_rescan_args)
#define BTRFS_IOC_QUOTA_RESCAN_STATUS _IOR(BTRFS_IOCTL_MAGIC, 45, \
struct btrfs_ioctl_quota_rescan_args)
#define BTRFS_IOC_GET_FSLABEL _IOR(BTRFS_IOCTL_MAGIC, 49, \
char[BTRFS_LABEL_SIZE])
#define BTRFS_IOC_SET_FSLABEL _IOW(BTRFS_IOCTL_MAGIC, 50, \
char[BTRFS_LABEL_SIZE])
#define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \
struct btrfs_ioctl_get_dev_stats)
#define BTRFS_IOC_DEV_REPLACE _IOWR(BTRFS_IOCTL_MAGIC, 53, \
struct btrfs_ioctl_dev_replace_args)
#ifdef __cplusplus
}
#endif
#endif
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