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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
2.7 KiB
C
68 lines
2.7 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 _TAPDISK_SERVER_H_
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#define _TAPDISK_SERVER_H_
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#include "list.h"
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#include "tapdisk-vbd.h"
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#include "tapdisk-queue.h"
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struct tap_disk *tapdisk_server_find_driver_interface(int);
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td_image_t *tapdisk_server_get_shared_image(td_image_t *);
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struct list_head *tapdisk_server_get_all_vbds(void);
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td_vbd_t *tapdisk_server_get_vbd(td_uuid_t);
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void tapdisk_server_add_vbd(td_vbd_t *);
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void tapdisk_server_remove_vbd(td_vbd_t *);
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void tapdisk_server_queue_tiocb(struct tiocb *);
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void tapdisk_server_check_state(void);
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event_id_t tapdisk_server_register_event(char, int, int, event_cb_t, void *);
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void tapdisk_server_unregister_event(event_id_t);
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void tapdisk_server_set_max_timeout(int);
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int tapdisk_server_init(void);
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int tapdisk_server_initialize(void);
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int tapdisk_server_complete(void);
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int tapdisk_server_run(void);
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void tapdisk_server_iterate(void);
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#define TAPDISK_TIOCBS (TAPDISK_DATA_REQUESTS + 50)
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typedef struct tapdisk_server {
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int run;
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struct list_head vbds;
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scheduler_t scheduler;
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struct tqueue aio_queue;
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} tapdisk_server_t;
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#endif
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