1 /* 2 * Copyright (c) 2008, XenSource Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * * Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * * Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * * Neither the name of XenSource Inc. nor the names of its contributors 13 * may be used to endorse or promote products derived from this software 14 * without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 20 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 24 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 26 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 #ifndef _BLKTAP_2_H_ 29 #define _BLKTAP_2_H_ 30 31 #define BLKTAP2_MAX_MESSAGE_LEN 256 32 33 #define BLKTAP2_RING_MESSAGE_PAUSE 1 34 #define BLKTAP2_RING_MESSAGE_RESUME 2 35 #define BLKTAP2_RING_MESSAGE_CLOSE 3 36 37 #define BLKTAP2_IOCTL_KICK_FE 1 38 #define BLKTAP2_IOCTL_ALLOC_TAP 200 39 #define BLKTAP2_IOCTL_FREE_TAP 201 40 #define BLKTAP2_IOCTL_CREATE_DEVICE 202 41 #define BLKTAP2_IOCTL_SET_PARAMS 203 42 #define BLKTAP2_IOCTL_PAUSE 204 43 #define BLKTAP2_IOCTL_REOPEN 205 44 #define BLKTAP2_IOCTL_RESUME 206 45 46 #define BLKTAP2_SYSFS_DIR "/sys/class/blktap2" 47 #define BLKTAP2_CONTROL_NAME "blktap-control" 48 #define BLKTAP2_CONTROL_DIR "/var/run/"BLKTAP2_CONTROL_NAME 49 #define BLKTAP2_CONTROL_SOCKET "ctl" 50 #define BLKTAP2_DIRECTORY "/dev/xen/blktap-2" 51 #define BLKTAP2_CONTROL_DEVICE BLKTAP2_DIRECTORY"/control" 52 #define BLKTAP2_RING_DEVICE BLKTAP2_DIRECTORY"/blktap" 53 #define BLKTAP2_IO_DEVICE BLKTAP2_DIRECTORY"/tapdev" 54 55 struct blktap2_handle { 56 unsigned int ring; 57 unsigned int device; 58 unsigned int minor; 59 }; 60 61 struct blktap2_params { 62 char name[BLKTAP2_MAX_MESSAGE_LEN]; 63 unsigned long long capacity; 64 unsigned long sector_size; 65 }; 66 67 #endif 68