1 /*
2  * Copyright (c) 2011-2012 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 <strings.h>
44 #include <unistd.h>
45 #include <dmsg.h>
46 
47 static int cluster_connect(const char *volume);
48 
49 /*
50  * Usage: mount_hammer2 [volume] [mtpt]
51  */
52 int
53 main(int argc, char *argv[])
54 {
55 	struct hammer2_mount_info info;
56 	struct vfsconf vfc;
57 	char *mountpt;
58 	int error;
59 	int mount_flags;
60 
61 	bzero(&info, sizeof(info));
62 	mount_flags = 0;
63 
64 	if (argc < 3)
65 		exit(1);
66 
67 	error = getvfsbyname("hammer2", &vfc);
68 	if (error) {
69 		fprintf(stderr, "hammer2 vfs not loaded\n");
70 		exit(1);
71 	}
72 
73 	/*
74 	 * Connect to the cluster controller.  This handles both remote
75 	 * mounts and device cache/master/slave mounts.
76 	 *
77 	 * When doing remote mounts that are allowed to run in the background
78 	 * the mount program will fork, detach, print a message, and exit(0)
79 	 * the originator while retrying in the background.
80 	 */
81 	info.cluster_fd = cluster_connect(argv[1]);
82 	if (info.cluster_fd < 0) {
83 		fprintf(stderr,
84 			"hammer2_mount: cluster_connect(%s) failed\n",
85 			argv[1]);
86 		exit(1);
87 	}
88 
89 	/*
90 	 * Try to mount it
91 	 */
92 	info.volume = argv[1];
93 	info.hflags = 0;
94 	mountpt = argv[2];
95 
96 	error = mount(vfc.vfc_name, mountpt, mount_flags, &info);
97 	if (error < 0) {
98 		if (errno == ERANGE) {
99 			fprintf(stderr,
100 				"%s integrated with %s\n",
101 				info.volume, mountpt);
102 		} else {
103 			perror("mount: ");
104 			exit(1);
105 		}
106 	}
107 
108 	/*
109 	 * XXX fork a backgrounded reconnector process to handle connection
110 	 *     failures. XXX
111 	 */
112 
113 	return (0);
114 }
115 
116 /*
117  * Connect to the cluster controller.  We can connect to a local or remote
118  * cluster controller, depending.  For a multi-node cluster we always want
119  * to connect to the local controller and let it maintain the connections
120  * to the multiple remote nodes.
121  */
122 static
123 int
124 cluster_connect(const char *volume __unused)
125 {
126 	struct sockaddr_in lsin;
127 	int fd;
128 
129 	/*
130 	 * This starts the hammer2 service if it isn't already running,
131 	 * so we can connect to it.
132 	 */
133 	system("/sbin/hammer2 -q service");
134 
135 	/*
136 	 * Connect us to the service but leave the rest to the kernel.
137 	 * If the connection is lost during the mount
138 	 */
139 	if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
140 		perror("socket");
141 		return(-1);
142 	}
143 	bzero(&lsin, sizeof(lsin));
144 	lsin.sin_family = AF_INET;
145 	lsin.sin_addr.s_addr = 0;
146 	lsin.sin_port = htons(DMSG_LISTEN_PORT);
147 
148 	if (connect(fd, (struct sockaddr *)&lsin, sizeof(lsin)) < 0) {
149 		close(fd);
150 		fprintf(stderr, "mount_hammer2: unable to connect to "
151 				"cluster controller\n");
152 		return(-1);
153 	}
154 
155 	return(fd);
156 }
157