1 /*
2  * Copyright (c) 2007 The DragonFly Project.  All rights reserved.
3  *
4  * This code is derived from software contributed to The DragonFly Project
5  * by Matthew Dillon <dillon@backplane.com>
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  *
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in
15  *    the documentation and/or other materials provided with the
16  *    distribution.
17  * 3. Neither the name of The DragonFly Project nor the names of its
18  *    contributors may be used to endorse or promote products derived
19  *    from this software without specific, prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  */
34 
35 #include <sys/types.h>
36 #include <sys/stat.h>
37 #include <sys/syslimits.h>
38 #include <vfs/hammer/hammer_mount.h>
39 #include <vfs/hammer/hammer_disk.h>
40 
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <stdarg.h>
44 #include <stddef.h>
45 #include <unistd.h>
46 #include <string.h>
47 #include <fcntl.h>
48 #include <err.h>
49 #include <mntopts.h>
50 
51 static void extract_volumes(struct hammer_mount_info *info, char **av, int ac);
52 static void free_volumes(struct hammer_mount_info *info);
53 static void test_volumes(struct hammer_mount_info *info);
54 static void usage(void);
55 
56 #define MOPT_UPDATE         { "update",     0, MNT_UPDATE, 0 }
57 
58 #define MOPT_HAMMEROPTS		\
59 	{ "history", 1, HMNT_NOHISTORY, 1 },	\
60 	{ "master=", 0, HMNT_MASTERID, 1 },	\
61 	{ "mirror", 1, HMNT_NOMIRROR, 1 }
62 
63 static struct mntopt mopts[] = { MOPT_STDOPTS, MOPT_HAMMEROPTS,
64 				 MOPT_UPDATE, MOPT_NULL };
65 
66 int
67 main(int ac, char **av)
68 {
69 	struct hammer_mount_info info;
70 	struct vfsconf vfc;
71 	int mount_flags = 0;
72 	int init_flags = 0;
73 	int error;
74 	int ch;
75 	char *mountpt;
76 	char *ptr;
77 
78 	bzero(&info, sizeof(info));
79 
80 	while ((ch = getopt(ac, av, "o:T:u")) != -1) {
81 		switch(ch) {
82 		case 'T':
83 			info.asof = strtoull(optarg, NULL, 0);
84 			break;
85 		case 'o':
86 			getmntopts(optarg, mopts, &mount_flags, &info.hflags);
87 
88 			/*
89 			 * Handle extended flags with parameters.
90 			 */
91 			if (info.hflags & HMNT_MASTERID) {
92 				ptr = strstr(optarg, "master=");
93 				if (ptr) {
94 					info.master_id = strtol(ptr + 7, NULL, 0);
95 					if (info.master_id == 0) {
96 						fprintf(stderr,
97 	"mount_hammer: Warning: a master id of 0 is the default, explicit\n"
98 	"settings should probably use 1-15\n");
99 					}
100 				}
101 			}
102 			if (info.hflags & HMNT_NOMIRROR) {
103 				ptr = strstr(optarg, "nomirror");
104 				if (ptr)
105 					info.master_id = -1;
106 			}
107 			break;
108 		case 'u':
109 			init_flags |= MNT_UPDATE;
110 			break;
111 		default:
112 			usage();
113 			/* not reached */
114 		}
115 	}
116 	ac -= optind;
117 	av += optind;
118 	mount_flags |= init_flags;
119 
120 	/*
121 	 * Only the mount point need be specified in update mode.
122 	 */
123 	if (init_flags & MNT_UPDATE) {
124 		if (ac != 1) {
125 			usage();
126 			/* not reached */
127 		}
128 		mountpt = av[0];
129 		if (mount(vfc.vfc_name, mountpt, mount_flags, &info))
130 			err(1, "mountpoint %s", mountpt);
131 		exit(0);
132 	}
133 
134 	if (ac < 2) {
135 		usage();
136 		/* not reached */
137 	}
138 
139 	/*
140 	 * Mount arguments: vol [vol...] mountpt
141 	 */
142 	extract_volumes(&info, av, ac - 1);
143 	mountpt = av[ac - 1];
144 
145 	/*
146 	 * Load the hammer module if necessary (this bit stolen from
147 	 * mount_null).
148 	 */
149 	error = getvfsbyname("hammer", &vfc);
150 	if (error && vfsisloadable("hammer")) {
151 		if (vfsload("hammer") != 0)
152 			err(1, "vfsload(hammer)");
153 		endvfsent();
154 		error = getvfsbyname("hammer", &vfc);
155 	}
156 	if (error)
157 		errx(1, "hammer filesystem is not available");
158 
159 	if (mount(vfc.vfc_name, mountpt, mount_flags, &info)) {
160 		perror("mount");
161 		test_volumes(&info);
162 		exit(1);
163 	}
164 	free_volumes(&info);
165 	exit(0);
166 }
167 
168 /*
169  * Extract a volume list
170  */
171 static
172 void
173 extract_volumes(struct hammer_mount_info *info, char **av, int ac)
174 {
175 	int idx = 0;
176 	int arymax = 32;
177 	char **ary = malloc(sizeof(char *) * arymax);
178 	char *ptr;
179 	char *next;
180 	char *orig;
181 
182 	while (ac) {
183 		if (idx == arymax) {
184 			arymax += 32;
185 			ary = realloc(ary, sizeof(char *) * arymax);
186 		}
187 		if (strchr(*av, ':') == NULL) {
188 			ary[idx++] = strdup(*av);
189 		} else {
190 			orig = next = strdup(*av);
191 			while ((ptr = next) != NULL) {
192 				if (idx == arymax) {
193 					arymax += 32;
194 					ary = realloc(ary, sizeof(char *) *
195 						      arymax);
196 				}
197 				if ((next = strchr(ptr, ':')) != NULL)
198 					*next++ = 0;
199 				ary[idx++] = strdup(ptr);
200 			}
201 			free(orig);
202 		}
203 		--ac;
204 		++av;
205 	}
206 	info->nvolumes = idx;
207 	info->volumes = ary;
208 }
209 
210 static
211 void
212 free_volumes(struct hammer_mount_info *info)
213 {
214 	int i;
215 
216 	for (i = 0; i < info->nvolumes; i++)
217 		free(info->volumes[i]);
218 	free(info->volumes);
219 }
220 
221 static
222 void
223 test_volumes(struct hammer_mount_info *info)
224 {
225 	int i, fd, ret;
226 	const char *vol;
227 	char buf[HAMMER_BUFSIZE];
228 	hammer_volume_ondisk_t ondisk;
229 
230 	for (i = 0; i < info->nvolumes; i++) {
231 		vol = info->volumes[i];
232 		fd = open(vol, O_RDONLY);
233 		if (fd < 0) {
234 			fprintf(stderr, "%s: Failed to open\n", vol);
235 			goto next;
236 		}
237 
238 		bzero(buf, HAMMER_BUFSIZE);
239 		ret = pread(fd, buf, HAMMER_BUFSIZE, 0);
240 		if (ret != HAMMER_BUFSIZE) {
241 			fprintf(stderr,
242 				"%s: Failed to read volume header\n", vol);
243 			goto next;
244 		}
245 
246 		ondisk = (hammer_volume_ondisk_t)buf;
247 		if (ondisk->vol_signature != HAMMER_FSBUF_VOLUME) {
248 			fprintf(stderr,
249 				"%s: Not a valid HAMMER filesystem\n", vol);
250 			goto next;
251 		}
252 		if (ondisk->vol_count != info->nvolumes) {
253 			fprintf(stderr,
254 				"%s: Volume header says %d volumes\n",
255 				vol, ondisk->vol_count);
256 			goto next;
257 		}
258 next:
259 		close(fd);
260 	}
261 }
262 
263 static
264 void
265 usage(void)
266 {
267 	fprintf(stderr, "usage: mount_hammer [-o options] [-T transaction-id] "
268 			"special ... node\n");
269 	fprintf(stderr, "       mount_hammer [-o options] [-T transaction-id] "
270 			"special[:special]* node\n");
271 	fprintf(stderr, "       mount_hammer -u [-o options] node\n");
272 	exit(1);
273 }
274