1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <stdint.h>
32 #include <fcntl.h>
33 #include <unistd.h>
34 #include <string.h>
35 #include <err.h>
36 #include <errno.h>
37 #include <assert.h>
38 #include <sys/param.h>
39 #include <sys/time.h>
40 #include <sys/bio.h>
41 #include <sys/disk.h>
42 #include <sys/ioctl.h>
43 #include <sys/stat.h>
44 #include <sys/syslog.h>
45
46 #include "ggate.h"
47
48
49 static enum { UNSET, CREATE, DESTROY, LIST, RESCUE } action = UNSET;
50
51 static const char *path = NULL;
52 static int unit = G_GATE_UNIT_AUTO;
53 static unsigned flags = 0;
54 static int direct_flag = 0;
55 static int force = 0;
56 static unsigned sectorsize = 0;
57 static unsigned timeout = G_GATE_TIMEOUT;
58
59 static void
usage(void)60 usage(void)
61 {
62
63 fprintf(stderr, "usage: %s create [-v] [-o option] ... "
64 "[-s sectorsize] [-t timeout] [-u unit] <path>\n", getprogname());
65 fprintf(stderr, " %s rescue [-v] [-o option] ... <-u unit> "
66 "<path>\n", getprogname());
67 fprintf(stderr, " %s destroy [-f] <-u unit>\n", getprogname());
68 fprintf(stderr, " %s list [-v] [-u unit]\n", getprogname());
69 fprintf(stderr, " option = {ro, wo, rw, direct}\n");
70 exit(EXIT_FAILURE);
71 }
72
73 static int
g_gate_openflags(unsigned ggflags)74 g_gate_openflags(unsigned ggflags)
75 {
76 int openflags = O_RDWR;
77
78 if ((ggflags & G_GATE_FLAG_READONLY) != 0)
79 openflags = O_RDONLY;
80 else if ((ggflags & G_GATE_FLAG_WRITEONLY) != 0)
81 openflags = O_WRONLY;
82
83 if (direct_flag)
84 openflags |= O_DIRECT;
85
86 return (openflags);
87 }
88
89 static void
g_gatel_serve(int fd)90 g_gatel_serve(int fd)
91 {
92 struct g_gate_ctl_io ggio;
93 size_t bsize;
94
95 if (g_gate_verbose == 0) {
96 if (daemon(0, 0) == -1) {
97 g_gate_destroy(unit, 1);
98 err(EXIT_FAILURE, "Cannot daemonize");
99 }
100 }
101 g_gate_log(LOG_DEBUG, "Worker created: %u.", getpid());
102 ggio.gctl_version = G_GATE_VERSION;
103 ggio.gctl_unit = unit;
104 bsize = sectorsize;
105 ggio.gctl_data = malloc(bsize);
106 for (;;) {
107 int error;
108 once_again:
109 ggio.gctl_length = bsize;
110 ggio.gctl_error = 0;
111 g_gate_ioctl(G_GATE_CMD_START, &ggio);
112 error = ggio.gctl_error;
113 switch (error) {
114 case 0:
115 break;
116 case ECANCELED:
117 /* Exit gracefully. */
118 free(ggio.gctl_data);
119 g_gate_close_device();
120 close(fd);
121 exit(EXIT_SUCCESS);
122 case ENOMEM:
123 /* Buffer too small. */
124 assert(ggio.gctl_cmd == BIO_DELETE ||
125 ggio.gctl_cmd == BIO_WRITE);
126 ggio.gctl_data = realloc(ggio.gctl_data,
127 ggio.gctl_length);
128 if (ggio.gctl_data != NULL) {
129 bsize = ggio.gctl_length;
130 goto once_again;
131 }
132 /* FALLTHROUGH */
133 case ENXIO:
134 default:
135 g_gate_xlog("ioctl(/dev/%s): %s.", G_GATE_CTL_NAME,
136 strerror(error));
137 }
138
139 error = 0;
140 switch (ggio.gctl_cmd) {
141 case BIO_READ:
142 if ((size_t)ggio.gctl_length > bsize) {
143 ggio.gctl_data = realloc(ggio.gctl_data,
144 ggio.gctl_length);
145 if (ggio.gctl_data != NULL)
146 bsize = ggio.gctl_length;
147 else
148 error = ENOMEM;
149 }
150 if (error == 0) {
151 if (pread(fd, ggio.gctl_data, ggio.gctl_length,
152 ggio.gctl_offset) == -1) {
153 error = errno;
154 }
155 }
156 break;
157 case BIO_DELETE:
158 case BIO_WRITE:
159 if (pwrite(fd, ggio.gctl_data, ggio.gctl_length,
160 ggio.gctl_offset) == -1) {
161 error = errno;
162 }
163 break;
164 default:
165 error = EOPNOTSUPP;
166 }
167
168 ggio.gctl_error = error;
169 g_gate_ioctl(G_GATE_CMD_DONE, &ggio);
170 }
171 }
172
173 static void
g_gatel_create(void)174 g_gatel_create(void)
175 {
176 struct g_gate_ctl_create ggioc;
177 int fd;
178
179 fd = open(path, g_gate_openflags(flags) | O_DIRECT | O_FSYNC);
180 if (fd == -1)
181 err(EXIT_FAILURE, "Cannot open %s", path);
182 memset(&ggioc, 0, sizeof(ggioc));
183 ggioc.gctl_version = G_GATE_VERSION;
184 ggioc.gctl_unit = unit;
185 ggioc.gctl_mediasize = g_gate_mediasize(fd);
186 if (sectorsize == 0)
187 sectorsize = g_gate_sectorsize(fd);
188 ggioc.gctl_sectorsize = sectorsize;
189 ggioc.gctl_timeout = timeout;
190 ggioc.gctl_flags = flags;
191 ggioc.gctl_maxcount = 0;
192 strlcpy(ggioc.gctl_info, path, sizeof(ggioc.gctl_info));
193 g_gate_ioctl(G_GATE_CMD_CREATE, &ggioc);
194 if (unit == -1)
195 printf("%s%u\n", G_GATE_PROVIDER_NAME, ggioc.gctl_unit);
196 unit = ggioc.gctl_unit;
197 g_gatel_serve(fd);
198 }
199
200 static void
g_gatel_rescue(void)201 g_gatel_rescue(void)
202 {
203 struct g_gate_ctl_cancel ggioc;
204 int fd;
205
206 fd = open(path, g_gate_openflags(flags));
207 if (fd == -1)
208 err(EXIT_FAILURE, "Cannot open %s", path);
209
210 ggioc.gctl_version = G_GATE_VERSION;
211 ggioc.gctl_unit = unit;
212 ggioc.gctl_seq = 0;
213 g_gate_ioctl(G_GATE_CMD_CANCEL, &ggioc);
214
215 g_gatel_serve(fd);
216 }
217
218 int
main(int argc,char * argv[])219 main(int argc, char *argv[])
220 {
221
222 if (argc < 2)
223 usage();
224 if (strcasecmp(argv[1], "create") == 0)
225 action = CREATE;
226 else if (strcasecmp(argv[1], "rescue") == 0)
227 action = RESCUE;
228 else if (strcasecmp(argv[1], "destroy") == 0)
229 action = DESTROY;
230 else if (strcasecmp(argv[1], "list") == 0)
231 action = LIST;
232 else
233 usage();
234 argc -= 1;
235 argv += 1;
236 for (;;) {
237 int ch;
238
239 ch = getopt(argc, argv, "fo:s:t:u:v");
240 if (ch == -1)
241 break;
242 switch (ch) {
243 case 'f':
244 if (action != DESTROY)
245 usage();
246 force = 1;
247 break;
248 case 'o':
249 if (action != CREATE && action != RESCUE)
250 usage();
251 if (strcasecmp("ro", optarg) == 0)
252 flags = G_GATE_FLAG_READONLY;
253 else if (strcasecmp("wo", optarg) == 0)
254 flags = G_GATE_FLAG_WRITEONLY;
255 else if (strcasecmp("rw", optarg) == 0)
256 flags = 0;
257 else if (strcasecmp("direct", optarg) == 0)
258 direct_flag = 1;
259 else {
260 errx(EXIT_FAILURE,
261 "Invalid argument for '-o' option.");
262 }
263 break;
264 case 's':
265 if (action != CREATE)
266 usage();
267 errno = 0;
268 sectorsize = strtoul(optarg, NULL, 10);
269 if (sectorsize == 0 && errno != 0)
270 errx(EXIT_FAILURE, "Invalid sectorsize.");
271 break;
272 case 't':
273 if (action != CREATE)
274 usage();
275 errno = 0;
276 timeout = strtoul(optarg, NULL, 10);
277 if (timeout == 0 && errno != 0)
278 errx(EXIT_FAILURE, "Invalid timeout.");
279 break;
280 case 'u':
281 errno = 0;
282 unit = strtol(optarg, NULL, 10);
283 if (unit == 0 && errno != 0)
284 errx(EXIT_FAILURE, "Invalid unit number.");
285 break;
286 case 'v':
287 if (action == DESTROY)
288 usage();
289 g_gate_verbose++;
290 break;
291 default:
292 usage();
293 }
294 }
295 argc -= optind;
296 argv += optind;
297
298 switch (action) {
299 case CREATE:
300 if (argc != 1)
301 usage();
302 g_gate_load_module();
303 g_gate_open_device();
304 path = argv[0];
305 g_gatel_create();
306 break;
307 case RESCUE:
308 if (argc != 1)
309 usage();
310 if (unit == -1) {
311 fprintf(stderr, "Required unit number.\n");
312 usage();
313 }
314 g_gate_open_device();
315 path = argv[0];
316 g_gatel_rescue();
317 break;
318 case DESTROY:
319 if (unit == -1) {
320 fprintf(stderr, "Required unit number.\n");
321 usage();
322 }
323 g_gate_verbose = 1;
324 g_gate_open_device();
325 g_gate_destroy(unit, force);
326 break;
327 case LIST:
328 g_gate_list(unit, g_gate_verbose);
329 break;
330 case UNSET:
331 default:
332 usage();
333 }
334 g_gate_close_device();
335 exit(EXIT_SUCCESS);
336 }
337