1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #include <sys/types.h>
28 #include <sys/errno.h>
29 #include <sys/kmem.h>
30 #include <sys/vnode.h>
31 #include <sys/pathname.h>
32 #include <sys/door.h>
33 #include <sys/cmn_err.h>
34 #include <sys/sunddi.h> /* for string functions */
35 #include <sys/vscan.h>
36
37 #define VS_DOOR_RETRIES 3
38
39 /* max time (secs) to wait for door calls to complete during door_close */
40 #define VS_DOOR_CLOSE_TIMEOUT_DEFAULT 30
41 uint32_t vs_door_close_timeout = VS_DOOR_CLOSE_TIMEOUT_DEFAULT;
42
43 static door_handle_t vscan_door_handle = NULL;
44 static kmutex_t vscan_door_mutex;
45 static kcondvar_t vscan_door_cv;
46 static int vscan_door_call_count = 0;
47
48
49 /*
50 * vscan_door_init
51 */
52 int
vscan_door_init(void)53 vscan_door_init(void)
54 {
55 mutex_init(&vscan_door_mutex, NULL, MUTEX_DEFAULT, NULL);
56 cv_init(&vscan_door_cv, NULL, CV_DEFAULT, NULL);
57 return (0);
58 }
59
60
61 /*
62 * vscan_door_fini
63 */
64 void
vscan_door_fini(void)65 vscan_door_fini(void)
66 {
67 mutex_destroy(&vscan_door_mutex);
68 cv_destroy(&vscan_door_cv);
69 }
70
71
72 /*
73 * vscan_door_open
74 */
75 int
vscan_door_open(int door_id)76 vscan_door_open(int door_id)
77 {
78 mutex_enter(&vscan_door_mutex);
79
80 if (vscan_door_handle == NULL)
81 vscan_door_handle = door_ki_lookup(door_id);
82
83 if (vscan_door_handle == NULL) {
84 cmn_err(CE_WARN, "Internal communication error "
85 "- failed to access vscan service daemon.");
86 mutex_exit(&vscan_door_mutex);
87 return (-1);
88 }
89
90 mutex_exit(&vscan_door_mutex);
91 return (0);
92 }
93
94
95 /*
96 * vscan_door_close
97 */
98 void
vscan_door_close(void)99 vscan_door_close(void)
100 {
101 clock_t timeout, time_left;
102
103 mutex_enter(&vscan_door_mutex);
104
105 /* wait for any in-progress requests to complete */
106 time_left = SEC_TO_TICK(vs_door_close_timeout);
107 while ((vscan_door_call_count > 0) && (time_left > 0)) {
108 timeout = time_left;
109 time_left = cv_reltimedwait(&vscan_door_cv, &vscan_door_mutex,
110 timeout, TR_CLOCK_TICK);
111 }
112
113 if (time_left == -1)
114 cmn_err(CE_WARN, "Timeout waiting for door calls to complete");
115
116 if (vscan_door_handle) {
117 door_ki_rele(vscan_door_handle);
118 vscan_door_handle = NULL;
119 }
120
121 mutex_exit(&vscan_door_mutex);
122 }
123
124
125 /*
126 * vscan_door_scan_file
127 *
128 * Returns: result returned in door response or VS_STATUS_ERROR
129 */
130 int
vscan_door_scan_file(vs_scan_req_t * scan_req)131 vscan_door_scan_file(vs_scan_req_t *scan_req)
132 {
133 int err;
134 int i;
135 door_arg_t arg;
136 uint32_t result = 0;
137
138 if (!vscan_door_handle)
139 return (VS_STATUS_ERROR);
140
141 mutex_enter(&vscan_door_mutex);
142 vscan_door_call_count++;
143 mutex_exit(&vscan_door_mutex);
144
145 arg.data_ptr = (char *)scan_req;
146 arg.data_size = sizeof (vs_scan_req_t);
147 arg.desc_ptr = NULL;
148 arg.desc_num = 0;
149 arg.rbuf = (char *)&result;
150 arg.rsize = sizeof (uint32_t);
151
152 for (i = 0; i < VS_DOOR_RETRIES; ++i) {
153 if ((err = door_ki_upcall_limited(vscan_door_handle, &arg,
154 NULL, SIZE_MAX, 0)) == 0)
155 break;
156
157 if (err != EAGAIN && err != EINTR)
158 break;
159 }
160
161 if (err != 0) {
162 cmn_err(CE_WARN, "Internal communication error (%d)"
163 "- failed to send scan request to vscand", err);
164 result = VS_STATUS_ERROR;
165 }
166
167 mutex_enter(&vscan_door_mutex);
168 vscan_door_call_count--;
169 cv_signal(&vscan_door_cv);
170 mutex_exit(&vscan_door_mutex);
171
172 return (result);
173 }
174