xref: /illumos-gate/usr/src/cmd/fs.d/ufs/labelit/labelit.c (revision 2a8bcb4efb45d99ac41c94a75c396b362c414f7f)
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  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 
26 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
27 /*	  All Rights Reserved  	*/
28 
29 /*
30  * University Copyright- Copyright (c) 1982, 1986, 1988
31  * The Regents of the University of California
32  * All Rights Reserved
33  *
34  * University Acknowledgment- Portions of this document are derived from
35  * software developed by the University of California, Berkeley, and its
36  * contributors.
37  */
38 
39 /*
40  * Label a file system volume.
41  */
42 
43 #include <stdio.h>
44 #include <string.h>
45 #include <stdlib.h>
46 #include <unistd.h>
47 #include <sys/param.h>
48 #include <sys/types.h>
49 #include <sys/mntent.h>
50 #include <locale.h>
51 
52 #define	bcopy(f, t, n)    (void) memcpy(t, f, n)
53 #define	bzero(s, n)	memset(s, 0, n)
54 #define	bcmp(s, d, n)	memcmp(s, d, n)
55 
56 #define	index(s, r)	strchr(s, r)
57 #define	rindex(s, r)	strrchr(s, r)
58 
59 #include <sys/vnode.h>
60 #include <fcntl.h>
61 #include <sys/fs/ufs_inode.h>
62 #include <sys/fs/ufs_fs.h>
63 
64 static void usage();
65 static void label(char *, char *, char *);
66 
67 static union sbtag {
68 	char		dummy[SBSIZE];
69 	struct fs	sblk;
70 } sb_un, altsb_un;
71 
72 #define	sblock sb_un.sblk
73 #define	altsblock altsb_un.sblk
74 
75 extern int	optind;
76 extern char	*optarg;
77 
78 int
main(int argc,char * argv[])79 main(int argc, char *argv[])
80 {
81 	int		opt;
82 	char		*special = NULL;
83 	char		*fsname = NULL;
84 	char		*volume = NULL;
85 
86 	while ((opt = getopt(argc, argv, "o:")) != EOF) {
87 		switch (opt) {
88 
89 		case 'o':	/* specific options (none defined yet) */
90 			break;
91 
92 		case '?':
93 			usage();
94 		}
95 	}
96 	if (optind > (argc - 1)) {
97 		usage();
98 	}
99 	argc -= optind;
100 	argv = &argv[optind];
101 	special = argv[0];
102 	if (argc > 1) {
103 		fsname = argv[1];
104 		if (strlen(fsname) > 6) {
105 			(void) fprintf(stderr, gettext("labelit: "));
106 			(void) fprintf(stderr,
107 		gettext("fsname can not be longer than 6 characters\n"));
108 			exit(31+1);
109 		}
110 	}
111 	if (argc > 2) {
112 		volume = argv[2];
113 		if (strlen(volume) > 6) {
114 			(void) fprintf(stderr, gettext("labelit: "));
115 			(void) fprintf(stderr,
116 		gettext("volume can not be longer than 6 characters\n"));
117 			exit(31+1);
118 		}
119 	}
120 	label(special, fsname, volume);
121 	return	(0);
122 }
123 
124 void
usage()125 usage()
126 {
127 
128 	(void) fprintf(stderr, gettext(
129 	"ufs usage: labelit [-F ufs] [gen opts] special [fsname volume]\n"));
130 	exit(31+1);
131 }
132 
133 void
label(char * special,char * fsname,char * volume)134 label(char *special, char *fsname, char *volume)
135 {
136 	int	f;
137 	int	blk;
138 	int	i;
139 	char	*p;
140 	offset_t offset;
141 	struct	fs	*fsp, *altfsp;
142 
143 	if (fsname == NULL) {
144 		f = open64(special, O_RDONLY);
145 	} else {
146 		f = open64(special, O_RDWR);
147 	}
148 	if (f < 0) {
149 		(void) fprintf(stderr, gettext("labelit: "));
150 		perror("open");
151 		exit(31+1);
152 	}
153 	if (llseek(f, (offset_t)SBLOCK * DEV_BSIZE, 0) < 0) {
154 		(void) fprintf(stderr, gettext("labelit: "));
155 		perror("llseek");
156 		exit(31+1);
157 	}
158 	if (read(f, &sblock, SBSIZE) != SBSIZE) {
159 		(void) fprintf(stderr, gettext("labelit: "));
160 		perror("read");
161 		exit(31+1);
162 	}
163 	if ((sblock.fs_magic != FS_MAGIC) &&
164 	    (sblock.fs_magic != MTB_UFS_MAGIC)) {
165 		(void) fprintf(stderr, gettext("labelit: "));
166 		(void) fprintf(stderr,
167 			gettext("bad super block magic number\n"));
168 		exit(31+1);
169 	}
170 	if ((sblock.fs_magic == FS_MAGIC) &&
171 	    ((sblock.fs_version != UFS_EFISTYLE4NONEFI_VERSION_2) &&
172 	    (sblock.fs_version != UFS_VERSION_MIN))) {
173 		(void) fprintf(stderr, gettext("labelit: "));
174 		(void) fprintf(stderr,
175 			gettext("unrecognized UFS format version: %d\n"),
176 			    sblock.fs_version);
177 		exit(31+1);
178 	}
179 	if ((sblock.fs_magic == MTB_UFS_MAGIC) &&
180 	    ((sblock.fs_version > MTB_UFS_VERSION_1) ||
181 	    (sblock.fs_version < MTB_UFS_VERSION_MIN))) {
182 		(void) fprintf(stderr, gettext("labelit: "));
183 		(void) fprintf(stderr,
184 			gettext("unrecognized UFS format version: %d\n"),
185 			    sblock.fs_version);
186 		exit(31+1);
187 	}
188 	fsp = &sblock;
189 
190 	/*
191 	 * Is block layout available?
192 	 */
193 
194 	if (sblock.fs_cpc <= 0 && (fsname || volume)) {
195 		(void) fprintf(stderr, gettext("labelit: "));
196 		(void) fprintf(stderr,
197 	gettext("insufficient superblock space for file system label\n"));
198 		return;
199 	}
200 
201 	/*
202 	 * calculate the available blocks for each rotational position
203 	 */
204 	blk = sblock.fs_spc * sblock.fs_cpc / NSPF(&sblock);
205 	for (i = 0; i < blk; i += sblock.fs_frag)
206 		/* void */;
207 	i -= sblock.fs_frag;
208 	blk = i / sblock.fs_frag;
209 	p = (char *)&(fs_rotbl(fsp)[blk]);
210 
211 	if (fsname != NULL) {
212 		for (i = 0; i < 14; i++)
213 			p[i] = '\0';
214 		for (i = 0; (i < 6) && (fsname[i]); i++, p++)
215 			*p = fsname[i];
216 		p++;
217 	}
218 	if (volume != NULL) {
219 		for (i = 0; (i < 6) && (volume[i]); i++, p++)
220 			*p = volume[i];
221 	}
222 	if (fsname != NULL) {
223 		if (llseek(f, (offset_t)SBLOCK * DEV_BSIZE, 0) < 0) {
224 			(void) fprintf(stderr, gettext("labelit: "));
225 			perror("llseek");
226 			exit(31+1);
227 		}
228 		if (write(f, &sblock, SBSIZE) != SBSIZE) {
229 			(void) fprintf(stderr, gettext("labelit: "));
230 			perror("write");
231 			exit(31+1);
232 		}
233 		for (i = 0; i < sblock.fs_ncg; i++) {
234 			/*
235 			 * In the case of multi-terabyte ufs file
236 			 * systems, only the first ten and last ten
237 			 * cylinder groups have copies of the superblock.
238 			 */
239 			if (sblock.fs_magic == MTB_UFS_MAGIC &&
240 			    sblock.fs_ncg > 20 &&
241 			    (i >= 10 && i < sblock.fs_ncg - 10))
242 				continue;
243 			offset =
244 			    (offset_t)cgsblock(&sblock, i) * sblock.fs_fsize;
245 			if (llseek(f, offset, 0) < 0) {
246 				(void) fprintf(stderr, gettext("labelit: "));
247 				perror("lseek");
248 				exit(31+1);
249 			}
250 			altfsp = &altsblock;
251 			if (read(f, &altsblock, SBSIZE) != SBSIZE) {
252 				(void) fprintf(stderr, gettext("labelit: "));
253 				perror("read");
254 				exit(31+1);
255 			}
256 			if ((altsblock.fs_magic != FS_MAGIC) &&
257 			    (altsblock.fs_magic != MTB_UFS_MAGIC)) {
258 			    (void) fprintf(stderr, gettext("labelit: "));
259 			    (void) fprintf(stderr,
260 		gettext("bad alternate super block(%i) magic number\n"), i);
261 				exit(31+1);
262 			}
263 			if ((altsblock.fs_magic == FS_MAGIC) &&
264 			    ((altsblock.fs_version !=
265 				UFS_EFISTYLE4NONEFI_VERSION_2) &&
266 			    (altsblock.fs_version != UFS_VERSION_MIN))) {
267 				(void) fprintf(stderr, gettext("labelit: "));
268 				(void) fprintf(stderr,
269 		gettext("bad alternate super block UFS format version: %d\n"),
270 					    altsblock.fs_version);
271 				exit(31+1);
272 			}
273 			if ((altsblock.fs_magic == MTB_UFS_MAGIC) &&
274 			    ((altsblock.fs_version > MTB_UFS_VERSION_1) ||
275 			    (altsblock.fs_version < MTB_UFS_VERSION_MIN))) {
276 				(void) fprintf(stderr, gettext("labelit: "));
277 				(void) fprintf(stderr,
278 		gettext("bad alternate super block UFS format version: %d\n"),
279 					    altsblock.fs_version);
280 				exit(31+1);
281 			}
282 			bcopy((char *)&(fs_rotbl(fsp)[blk]),
283 				(char *)&(fs_rotbl(altfsp)[blk]), 14);
284 
285 			if (llseek(f, offset, 0) < 0) {
286 				(void) fprintf(stderr, gettext("labelit: "));
287 				perror("llseek");
288 			exit(31+1);
289 			}
290 			if (write(f, &altsblock, SBSIZE) != SBSIZE) {
291 				(void) fprintf(stderr, gettext("labelit: "));
292 				perror("write");
293 				exit(31+1);
294 			}
295 		}
296 	}
297 	p = (char *)&(fs_rotbl(fsp)[blk]);
298 	(void) fprintf(stderr, gettext("fsname: "));
299 	for (i = 0; (i < 6) && (*p); i++, p++) {
300 		(void) fprintf(stderr, "%c", *p);
301 	}
302 	(void) fprintf(stderr, "\n");
303 	(void) fprintf(stderr, gettext("volume: "));
304 	p++;
305 	for (i = 0; (i < 6); i++, p++) {
306 		(void) fprintf(stderr, "%c", *p);
307 	}
308 	(void) fprintf(stderr, "\n");
309 }
310