Branch data Line data Source code
1 : : /*
2 : : * Copyright (c) 2016, Citrix Systems, Inc.
3 : : *
4 : : * All rights reserved.
5 : : *
6 : : * Redistribution and use in source and binary forms, with or without
7 : : * modification, are permitted provided that the following conditions are met:
8 : : *
9 : : * 1. Redistributions of source code must retain the above copyright
10 : : * notice, this list of conditions and the following disclaimer.
11 : : * 2. Redistributions in binary form must reproduce the above copyright
12 : : * notice, this list of conditions and the following disclaimer in the
13 : : * documentation and/or other materials provided with the distribution.
14 : : * 3. Neither the name of the copyright holder nor the names of its
15 : : * contributors may be used to endorse or promote products derived from
16 : : * this software without specific prior written permission.
17 : : *
18 : : * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 : : * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 : : * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 : : * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
22 : : * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23 : : * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24 : : * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
25 : : * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26 : : * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27 : : * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 : : * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 : : */
30 : :
31 : : #ifdef HAVE_CONFIG_H
32 : : #include "config.h"
33 : : #endif
34 : :
35 : : /*
36 : : * required by the Xen headers
37 : : */
38 : : #include <inttypes.h>
39 : :
40 : : #include <xen/xen.h>
41 : : #include <xen/grant_table.h>
42 : : #include <xen/event_channel.h>
43 : :
44 : : #include <stdio.h>
45 : : #include <string.h>
46 : : #include <unistd.h>
47 : :
48 : : #include "tap-ctl.h"
49 : : #include "compiler.h"
50 : : #include "util.h"
51 : :
52 : : int
53 : 0 : tap_ctl_connect_xenblkif(const pid_t pid, const domid_t domid, const int devid, int poll_duration,
54 : : int poll_idle_threshold,
55 : : const grant_ref_t * grefs, const int order, const evtchn_port_t port,
56 : : int proto, const char *pool, const int minor)
57 : : {
58 : : tapdisk_message_t message;
59 : : int i, err;
60 : :
61 : : memset(&message, 0, sizeof(message));
62 : 0 : message.type = TAPDISK_MESSAGE_XENBLKIF_CONNECT;
63 : 0 : message.cookie = minor;
64 : :
65 : 0 : message.u.blkif.domid = domid;
66 : 0 : message.u.blkif.devid = devid;
67 : 0 : for (i = 0; i < 1 << order; i++)
68 : 0 : message.u.blkif.gref[i] = grefs[i];
69 : 0 : message.u.blkif.order = order;
70 : 0 : message.u.blkif.port = port;
71 : 0 : message.u.blkif.proto = proto;
72 : 0 : message.u.blkif.poll_duration = poll_duration;
73 : 0 : message.u.blkif.poll_idle_threshold = poll_idle_threshold;
74 : 0 : if (pool) {
75 : 0 : if (unlikely(strlen(pool) > (sizeof(message.u.blkif.pool) - 1))) {
76 : : EPRINTF("pool name too long: %s\n", pool);
77 : 0 : return -ENAMETOOLONG;
78 : : }
79 : 0 : safe_strncpy(message.u.blkif.pool, pool, sizeof(message.u.blkif.pool));
80 : : } else {
81 : 0 : message.u.blkif.pool[0] = 0;
82 : : }
83 : :
84 : 0 : err = tap_ctl_connect_send_and_receive(pid, &message, NULL);
85 : 0 : if (err || message.type == TAPDISK_MESSAGE_ERROR) {
86 : 0 : if (!err)
87 : 0 : err = -message.u.response.error;
88 : 0 : if (err == -EALREADY)
89 : 0 : EPRINTF("failed to connect tapdisk[%d] to the ring: %s\n", pid,
90 : : strerror(-err));
91 : : }
92 : 0 : return err;
93 : : }
94 : :
95 : : int
96 : 0 : tap_ctl_disconnect_xenblkif(const pid_t pid, const domid_t domid,
97 : : const int devid, struct timeval *timeout)
98 : : {
99 : : int err;
100 : : tapdisk_message_t message;
101 : :
102 : : memset(&message, 0, sizeof(message));
103 : 0 : message.type = TAPDISK_MESSAGE_XENBLKIF_DISCONNECT;
104 : 0 : message.u.blkif.domid = domid;
105 : 0 : message.u.blkif.devid = devid;
106 : :
107 : 0 : err = tap_ctl_connect_send_and_receive(pid, &message, timeout);
108 : 0 : if (err)
109 : : goto out;
110 : :
111 : 0 : if (message.type == TAPDISK_MESSAGE_XENBLKIF_DISCONNECT_RSP
112 : 0 : || message.type == TAPDISK_MESSAGE_ERROR)
113 : 0 : err = -message.u.response.error;
114 : : else {
115 : 0 : EPRINTF("got unexpected result '%s' from tapdisk[%d]\n",
116 : : tapdisk_message_name(message.type), pid);
117 : : err = -EINVAL;
118 : : }
119 : :
120 : : out:
121 : 0 : if (err) {
122 : 0 : if (likely(err == -ENOENT))
123 : 0 : DPRINTF("failed to disconnect tapdisk[%d] from the ring: %s\n",
124 : : pid, strerror(-err));
125 : : else
126 : 0 : EPRINTF("failed to disconnect tapdisk[%d] from the ring: %s\n",
127 : : pid, strerror(-err));
128 : : }
129 : 0 : return err;
130 : : }
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