1 /*
2  * Copyright (c) 2011-2015 The DragonFly Project.  All rights reserved.
3  *
4  * This code is derived from software contributed to The DragonFly Project
5  * by Matthew Dillon <dillon@dragonflybsd.org>
6  * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in
16  *    the documentation and/or other materials provided with the
17  *    distribution.
18  * 3. Neither the name of The DragonFly Project nor the names of its
19  *    contributors may be used to endorse or promote products derived
20  *    from this software without specific, prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  */
35 #include <sys/types.h>
36 #include <sys/mount.h>
37 #include <sys/socket.h>
38 #include <netinet/in.h>
39 #include <vfs/hammer2/hammer2_mount.h>
40 
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <stdarg.h>
44 #include <string.h>
45 #include <unistd.h>
46 #include <errno.h>
47 #include <dmsg.h>
48 #include <mntopts.h>
49 
50 static int cluster_connect(const char *volume);
51 static void usage(const char *ctl, ...);
52 
53 static struct mntopt mopts[] = {
54 	MOPT_STDOPTS,
55 	MOPT_UPDATE,
56 	{ "local", 0, HMNT2_LOCAL, 1 },
57 	MOPT_NULL
58 };
59 
60 /*
61  * Usage: mount_hammer2 [volume] [mtpt]
62  */
63 int
64 main(int ac, char *av[])
65 {
66 	struct hammer2_mount_info info;
67 	struct vfsconf vfc;
68 	char *mountpt;
69 	char *devpath;
70 	int error;
71 	int ch;
72 	int mount_flags;
73 	int init_flags;
74 
75 	bzero(&info, sizeof(info));
76 	mount_flags = 0;
77 	init_flags = 0;
78 
79 	while ((ch = getopt(ac, av, "o:u")) != -1) {
80 		switch(ch) {
81 		case 'o':
82 			getmntopts(optarg, mopts, &mount_flags, &info.hflags);
83 			break;
84 		case 'u':
85 			init_flags |= MNT_UPDATE;
86 			break;
87 		default:
88 			usage("unknown option: -%c", ch);
89 			/* not reached */
90 		}
91 	}
92 	ac -= optind;
93 	av += optind;
94 	mount_flags |= init_flags;
95 
96 	error = getvfsbyname("hammer2", &vfc);
97 	if (error) {
98 		fprintf(stderr, "hammer2 vfs not loaded\n");
99 		exit(1);
100 	}
101 
102 	/*
103 	 * Only the mount point need be specified in update mode.
104 	 */
105 	if (init_flags & MNT_UPDATE) {
106 		if (ac != 1) {
107 			usage("missing parameter (node)");
108 			/* not reached */
109 		}
110 		mountpt = av[0];
111 		if (mount(vfc.vfc_name, mountpt, mount_flags, &info))
112 			usage("mount %s: %s", mountpt, strerror(errno));
113 		exit(0);
114 	}
115 
116 	/*
117 	 * New mount
118 	 */
119 	if (ac != 2) {
120 		usage("missing parameter(s) (special[@label] node)");
121 		/* not reached */
122 	}
123 
124 	devpath = strdup(av[0]);
125 	mountpt = av[1];
126 
127 	if (devpath[0] == 0) {
128 		fprintf(stderr, "mount_hammer2: empty device path\n");
129 		exit(1);
130 	}
131 
132 	/*
133 	 * Automatically add @BOOT, @ROOT, or @DATA if no label specified,
134 	 * based on the slice.
135 	 */
136 	if (strchr(devpath, '@') == NULL) {
137 		char slice = devpath[strlen(devpath)-1];
138 		switch(slice) {
139 		case 'a':
140 			asprintf(&devpath, "%s@BOOT", devpath);
141 			break;
142 		case 'd':
143 			asprintf(&devpath, "%s@ROOT", devpath);
144 			break;
145 		default:
146 			asprintf(&devpath, "%s@DATA", devpath);
147 			break;
148 		}
149 	}
150 
151 	/*
152 	 * Connect to the cluster controller.  This handles both remote
153 	 * mounts and device cache/master/slave mounts.
154 	 *
155 	 * When doing remote mounts that are allowed to run in the background
156 	 * the mount program will fork, detach, print a message, and exit(0)
157 	 * the originator while retrying in the background.
158 	 *
159 	 * Don't exit on failure, this isn't likely going to work for
160 	 * the root [re]mount in early boot.
161 	 */
162 	info.cluster_fd = cluster_connect(devpath);
163 	if (info.cluster_fd < 0) {
164 		fprintf(stderr,
165 			"mount_hammer2: cluster_connect(%s) failed\n",
166 			devpath);
167 	}
168 
169 	/*
170 	 * Try to mount it, prefix if necessary.
171 	 */
172 	if (!strchr(devpath, ':') && devpath[0] != '/' && devpath[0] != '@') {
173 		char *p2;
174 		asprintf(&p2, "/dev/%s", devpath);
175 		free(devpath);
176 		devpath = p2;
177 	}
178 	info.volume = devpath;
179 
180 	error = mount(vfc.vfc_name, mountpt, mount_flags, &info);
181 	if (error < 0) {
182 		if (errno == ERANGE) {
183 			fprintf(stderr,
184 				"mount_hammer2: %s integrated with %s\n",
185 				info.volume, mountpt);
186 		} else if (errno == ENOENT) {
187 			fprintf(stderr, "mount_hammer2: %s not found\n",
188 				info.volume);
189 		} else if (errno == ENXIO) {
190 			fprintf(stderr, "mount_hammer2: incorrect volume "
191 				"specification %s\n",
192 				info.volume);
193 		} else {
194 			perror("mount");
195 		}
196 		exit(1);
197 	}
198 	free(devpath);
199 
200 	/*
201 	 * XXX fork a backgrounded reconnector process to handle connection
202 	 *     failures.
203 	 */
204 
205 	return (0);
206 }
207 
208 /*
209  * Connect to the cluster controller.  We can connect to a local or remote
210  * cluster controller, depending.  For a multi-node cluster we always want
211  * to connect to the local controller and let it maintain the connections
212  * to the multiple remote nodes.
213  */
214 static
215 int
216 cluster_connect(const char *volume __unused)
217 {
218 	struct sockaddr_in lsin;
219 	int fd;
220 
221 	/*
222 	 * This starts the hammer2 service if it isn't already running,
223 	 * so we can connect to it.
224 	 */
225 	system("/sbin/hammer2 -q service");
226 
227 	/*
228 	 * Connect us to the service but leave the rest to the kernel.
229 	 * If the connection is lost during the mount
230 	 */
231 	if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
232 		perror("socket");
233 		return(-1);
234 	}
235 	bzero(&lsin, sizeof(lsin));
236 	lsin.sin_family = AF_INET;
237 	lsin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
238 	lsin.sin_port = htons(DMSG_LISTEN_PORT);
239 
240 	if (connect(fd, (struct sockaddr *)&lsin, sizeof(lsin)) < 0) {
241 		close(fd);
242 		fprintf(stderr, "mount_hammer2: unable to connect to "
243 				"cluster controller\n");
244 		return(-1);
245 	}
246 
247 	return(fd);
248 }
249 
250 static
251 void
252 usage(const char *ctl, ...)
253 {
254 	va_list va;
255 
256 	va_start(va, ctl);
257 	fprintf(stderr, "mount_hammer2: ");
258 	vfprintf(stderr, ctl, va);
259 	va_end(va);
260 	fprintf(stderr, "\n");
261 	fprintf(stderr, " mount_hammer2 [-o options] special[@label] node\n");
262 	fprintf(stderr, " mount_hammer2 [-o options] @label node\n");
263 	fprintf(stderr, " mount_hammer2 -u [-o options] node\n");
264 	fprintf(stderr, "\n");
265 	fprintf(stderr, "options:\n"
266 			" <standard_mount_options>\n"
267 			" local\t- disable PFS clustering for whole device\n"
268 	);
269 	exit(1);
270 }
271