Release 4.7 include/uapi/linux/nbd.h

/*
 * 1999 Copyright (C) Pavel Machek, pavel@ucw.cz. This code is GPL.
 * 1999/11/04 Copyright (C) 1999 VMware, Inc. (Regis "HPReg" Duchesne)
 *            Made nbd_end_request() use the io_request_lock
 * 2001 Copyright (C) Steven Whitehouse
 *            New nbd_end_request() for compatibility with new linux block
 *            layer code.
 * 2003/06/24 Louis D. Langholtz <ldl@aros.net>
 *            Removed unneeded blksize_bits field from nbd_device struct.
 *            Cleanup PARANOIA usage & code.
 * 2004/02/19 Paul Clements
 *            Removed PARANOIA, plus various cleanup and comments
 */

#ifndef _UAPILINUX_NBD_H

#define _UAPILINUX_NBD_H

#include <linux/types.h>


#define NBD_SET_SOCK	_IO( 0xab, 0 )

#define NBD_SET_BLKSIZE	_IO( 0xab, 1 )

#define NBD_SET_SIZE	_IO( 0xab, 2 )

#define NBD_DO_IT	_IO( 0xab, 3 )

#define NBD_CLEAR_SOCK	_IO( 0xab, 4 )

#define NBD_CLEAR_QUE	_IO( 0xab, 5 )

#define NBD_PRINT_DEBUG	_IO( 0xab, 6 )

#define NBD_SET_SIZE_BLOCKS	_IO( 0xab, 7 )

#define NBD_DISCONNECT  _IO( 0xab, 8 )

#define NBD_SET_TIMEOUT _IO( 0xab, 9 )

#define NBD_SET_FLAGS   _IO( 0xab, 10)

enum {
	
NBD_CMD_READ = 0,
	
NBD_CMD_WRITE = 1,
	
NBD_CMD_DISC = 2,
	
NBD_CMD_FLUSH = 3,
	
NBD_CMD_TRIM = 4
};

/* values for flags field */

#define NBD_FLAG_HAS_FLAGS    (1 << 0) 
/* nbd-server supports flags */

#define NBD_FLAG_READ_ONLY    (1 << 1) 
/* device is read-only */

#define NBD_FLAG_SEND_FLUSH   (1 << 2) 
/* can flush writeback cache */
/* there is a gap here to match userspace */

#define NBD_FLAG_SEND_TRIM    (1 << 5) 
/* send trim/discard */

/* userspace doesn't need the nbd_device structure */

/* These are sent over the network in the request/reply magic fields */


#define NBD_REQUEST_MAGIC 0x25609513

#define NBD_REPLY_MAGIC 0x67446698
/* Do *not* use magics: 0x12560953 0x96744668. */

/*
 * This is the packet used for communication between client and
 * server. All data are in network byte order.
 */

struct nbd_request {
	
__be32 magic;
	
__be32 type;	/* == READ || == WRITE  */
	
char handle[8];
	
__be64 from;
	
__be32 len;
} __attribute__((packed));

/*
 * This is the reply packet that nbd-server sends back to the client after
 * it has completed an I/O request (or an error occurs).
 */

struct nbd_reply {
	
__be32 magic;
	
__be32 error;		/* 0 = ok, else error   */
	
char handle[8];		/* handle you got from request  */
};
#endif /* _UAPILINUX_NBD_H */
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