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Keir Fraser
4b1af8b188
Tapdisk control in userspace, a replacement for the original blktap2 control stack, which had to pass a kernel space interface based on sysfs nodes. All tapdisk processes listen for commands on a unix stream socket. The control library supports scanning the socket namespace for running tapdisks, VBD minors allocated, associated images and state inquiry. Control operations include allocating/releasing devices, spawning tapdisks, opening/closing images, attaching disk images to devices. disk pause/resume operations and runtime switching of disk images. Signed-off-by: Jake Wires <jake.wires@citrix.com> Signed-off-by: Daniel Stodden <daniel.stodden@citrix.com>
68 lines
2.9 KiB
C
68 lines
2.9 KiB
C
/*
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* Copyright (c) 2008, XenSource Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of XenSource Inc. nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _BLKTAP_2_H_
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#define _BLKTAP_2_H_
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#define BLKTAP2_MAX_MESSAGE_LEN 256
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#define BLKTAP2_RING_MESSAGE_PAUSE 1
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#define BLKTAP2_RING_MESSAGE_RESUME 2
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#define BLKTAP2_RING_MESSAGE_CLOSE 3
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#define BLKTAP2_IOCTL_KICK_FE 1
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#define BLKTAP2_IOCTL_ALLOC_TAP 200
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#define BLKTAP2_IOCTL_FREE_TAP 201
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#define BLKTAP2_IOCTL_CREATE_DEVICE 202
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#define BLKTAP2_IOCTL_SET_PARAMS 203
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#define BLKTAP2_IOCTL_PAUSE 204
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#define BLKTAP2_IOCTL_REOPEN 205
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#define BLKTAP2_IOCTL_RESUME 206
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#define BLKTAP2_SYSFS_DIR "/sys/class/blktap2"
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#define BLKTAP2_CONTROL_NAME "blktap-control"
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#define BLKTAP2_CONTROL_DIR "/var/run/"BLKTAP2_CONTROL_NAME
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#define BLKTAP2_CONTROL_SOCKET "ctl"
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#define BLKTAP2_DIRECTORY "/dev/xen/blktap-2"
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#define BLKTAP2_CONTROL_DEVICE BLKTAP2_DIRECTORY"/control"
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#define BLKTAP2_RING_DEVICE BLKTAP2_DIRECTORY"/blktap"
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#define BLKTAP2_IO_DEVICE BLKTAP2_DIRECTORY"/tapdev"
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struct blktap2_handle {
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unsigned int ring;
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unsigned int device;
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unsigned int minor;
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};
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struct blktap2_params {
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char name[BLKTAP2_MAX_MESSAGE_LEN];
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unsigned long long capacity;
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unsigned long sector_size;
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};
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#endif
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