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1 /*
2  * util.c --- helper functions used by tune2fs and mke2fs
3  *
4  * Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
5  *
6  * %Begin-Header%
7  * This file may be redistributed under the terms of the GNU Public
8  * License.
9  * %End-Header%
10  */
11 
12 #ifndef _LARGEFILE_SOURCE
13 #define _LARGEFILE_SOURCE
14 #endif
15 #ifndef _LARGEFILE64_SOURCE
16 #define _LARGEFILE64_SOURCE
17 #endif
18 
19 #include "config.h"
20 #include <fcntl.h>
21 #include <setjmp.h>
22 #include <signal.h>
23 #include <stdio.h>
24 #include <string.h>
25 #ifdef HAVE_ERRNO_H
26 #include <errno.h>
27 #endif
28 #if HAVE_UNISTD_H
29 #include <unistd.h>
30 #endif
31 #ifdef HAVE_LINUX_MAJOR_H
32 #include <linux/major.h>
33 #endif
34 #include <sys/types.h>
35 #ifdef HAVE_SYS_STAT_H
36 #include <sys/stat.h>
37 #endif
38 #ifdef HAVE_UNISTD_H
39 #include <unistd.h>
40 #endif
41 #include <time.h>
42 
43 #include "et/com_err.h"
44 #include "e2p/e2p.h"
45 #include "ext2fs/ext2_fs.h"
46 #include "ext2fs/ext2fs.h"
47 #include "support/nls-enable.h"
48 #include "blkid/blkid.h"
49 #include "util.h"
50 
51 char *journal_location_string = NULL;
52 
53 #ifndef HAVE_STRCASECMP
strcasecmp(char * s1,char * s2)54 int strcasecmp (char *s1, char *s2)
55 {
56 	while (*s1 && *s2) {
57 		int ch1 = *s1++, ch2 = *s2++;
58 		if (isupper (ch1))
59 			ch1 = tolower (ch1);
60 		if (isupper (ch2))
61 			ch2 = tolower (ch2);
62 		if (ch1 != ch2)
63 			return ch1 - ch2;
64 	}
65 	return *s1 ? 1 : *s2 ? -1 : 0;
66 }
67 #endif
68 
69 /*
70  * Given argv[0], return the program name.
71  */
get_progname(char * argv_zero)72 char *get_progname(char *argv_zero)
73 {
74 	char	*cp;
75 
76 	cp = strrchr(argv_zero, '/');
77 	if (!cp )
78 		return argv_zero;
79 	else
80 		return cp+1;
81 }
82 
83 static jmp_buf alarm_env;
84 
alarm_signal(int signal EXT2FS_ATTR ((unused)))85 static void alarm_signal(int signal EXT2FS_ATTR((unused)))
86 {
87 	longjmp(alarm_env, 1);
88 }
89 
proceed_question(int delay)90 void proceed_question(int delay)
91 {
92 	char buf[256];
93 	const char *short_yes = _("yY");
94 
95 	fflush(stdout);
96 	fflush(stderr);
97 	if (delay > 0) {
98 		if (setjmp(alarm_env)) {
99 			signal(SIGALRM, SIG_IGN);
100 			printf("%s", _("<proceeding>\n"));
101 			return;
102 		}
103 		signal(SIGALRM, alarm_signal);
104 		printf(_("Proceed anyway (or wait %d seconds to proceed) ? (y,N) "),
105 		       delay);
106 		alarm(delay);
107 	} else
108 		fputs(_("Proceed anyway? (y,N) "), stdout);
109 	buf[0] = 0;
110 	if (!fgets(buf, sizeof(buf), stdin) ||
111 	    strchr(short_yes, buf[0]) == 0) {
112 		putc('\n', stdout);
113 		exit(1);
114 	}
115 	signal(SIGALRM, SIG_IGN);
116 }
117 
check_mount(const char * device,int force,const char * type)118 void check_mount(const char *device, int force, const char *type)
119 {
120 	errcode_t	retval;
121 	int		mount_flags;
122 
123 	retval = ext2fs_check_if_mounted(device, &mount_flags);
124 	if (retval) {
125 		com_err("ext2fs_check_if_mount", retval,
126 			_("while determining whether %s is mounted."),
127 			device);
128 		return;
129 	}
130 	if (mount_flags & EXT2_MF_MOUNTED) {
131 		fprintf(stderr, _("%s is mounted; "), device);
132 		if (force >= 2) {
133 			fputs(_("mke2fs forced anyway.  Hope /etc/mtab is "
134 				"incorrect.\n"), stderr);
135 			return;
136 		}
137 	abort_mke2fs:
138 		fprintf(stderr, _("will not make a %s here!\n"), type);
139 		exit(1);
140 	}
141 	if (mount_flags & EXT2_MF_BUSY) {
142 		fprintf(stderr, _("%s is apparently in use by the system; "),
143 			device);
144 		if (force >= 2) {
145 			fputs(_("mke2fs forced anyway.\n"), stderr);
146 			return;
147 		}
148 		goto abort_mke2fs;
149 	}
150 }
151 
parse_journal_opts(const char * opts)152 void parse_journal_opts(const char *opts)
153 {
154 	char	*buf, *token, *next, *p, *arg;
155 	int	len;
156 	int	journal_usage = 0;
157 
158 	len = strlen(opts);
159 	buf = malloc(len+1);
160 	if (!buf) {
161 		fputs(_("Couldn't allocate memory to parse journal "
162 			"options!\n"), stderr);
163 		exit(1);
164 	}
165 	strcpy(buf, opts);
166 	for (token = buf; token && *token; token = next) {
167 		p = strchr(token, ',');
168 		next = 0;
169 		if (p) {
170 			*p = 0;
171 			next = p+1;
172 		}
173 		arg = strchr(token, '=');
174 		if (arg) {
175 			*arg = 0;
176 			arg++;
177 		}
178 #if 0
179 		printf("Journal option=%s, argument=%s\n", token,
180 		       arg ? arg : "NONE");
181 #endif
182 		if (strcmp(token, "device") == 0) {
183 			journal_device = blkid_get_devname(NULL, arg, NULL);
184 			if (!journal_device) {
185 				if (arg)
186 					fprintf(stderr, _("\nCould not find "
187 						"journal device matching %s\n"),
188 						arg);
189 				journal_usage++;
190 				continue;
191 			}
192 		} else if (strcmp(token, "size") == 0) {
193 			if (!arg) {
194 				journal_usage++;
195 				continue;
196 			}
197 			journal_size = strtoul(arg, &p, 0);
198 			if (*p)
199 				journal_usage++;
200 		} else if (!strcmp(token, "location")) {
201 			if (!arg) {
202 				journal_usage++;
203 				continue;
204 			}
205 			journal_location_string = strdup(arg);
206 		} else if (strcmp(token, "v1_superblock") == 0) {
207 			journal_flags |= EXT2_MKJOURNAL_V1_SUPER;
208 			continue;
209 		} else
210 			journal_usage++;
211 	}
212 	if (journal_usage) {
213 		fputs(_("\nBad journal options specified.\n\n"
214 			"Journal options are separated by commas, "
215 			"and may take an argument which\n"
216 			"\tis set off by an equals ('=') sign.\n\n"
217 			"Valid journal options are:\n"
218 			"\tsize=<journal size in megabytes>\n"
219 			"\tdevice=<journal device>\n"
220 			"\tlocation=<journal location>\n\n"
221 			"The journal size must be between "
222 			"1024 and 10240000 filesystem blocks.\n\n"), stderr);
223 		free(buf);
224 		exit(1);
225 	}
226 	free(buf);
227 }
228 
229 /*
230  * Determine the number of journal blocks to use, either via
231  * user-specified # of megabytes, or via some intelligently selected
232  * defaults.
233  *
234  * Find a reasonable journal file size (in blocks) given the number of blocks
235  * in the filesystem.  For very small filesystems, it is not reasonable to
236  * have a journal that fills more than half of the filesystem.
237  */
figure_journal_size(int size,ext2_filsys fs)238 unsigned int figure_journal_size(int size, ext2_filsys fs)
239 {
240 	int j_blocks;
241 
242 	j_blocks = ext2fs_default_journal_size(ext2fs_blocks_count(fs->super));
243 	if (j_blocks < 0) {
244 		fputs(_("\nFilesystem too small for a journal\n"), stderr);
245 		return 0;
246 	}
247 
248 	if (size > 0) {
249 		j_blocks = size * 1024 / (fs->blocksize	/ 1024);
250 		if (j_blocks < 1024 || j_blocks > 10240000) {
251 			fprintf(stderr, _("\nThe requested journal "
252 				"size is %d blocks; it must be\n"
253 				"between 1024 and 10240000 blocks.  "
254 				"Aborting.\n"),
255 				j_blocks);
256 			exit(1);
257 		}
258 		if ((unsigned) j_blocks > ext2fs_free_blocks_count(fs->super) / 2) {
259 			fputs(_("\nJournal size too big for filesystem.\n"),
260 			      stderr);
261 			exit(1);
262 		}
263 	}
264 	return j_blocks;
265 }
266 
print_check_message(int mnt,unsigned int check)267 void print_check_message(int mnt, unsigned int check)
268 {
269 	if (mnt < 0)
270 		mnt = 0;
271 	if (!mnt && !check)
272 		return;
273 	printf(_("This filesystem will be automatically "
274 		 "checked every %d mounts or\n"
275 		 "%g days, whichever comes first.  "
276 		 "Use tune2fs -c or -i to override.\n"),
277 	       mnt, ((double) check) / (3600 * 24));
278 }
279 
dump_mmp_msg(struct mmp_struct * mmp,const char * msg)280 void dump_mmp_msg(struct mmp_struct *mmp, const char *msg)
281 {
282 
283 	if (msg)
284 		printf("MMP check failed: %s\n", msg);
285 	if (mmp) {
286 		time_t t = mmp->mmp_time;
287 
288 		printf("MMP error info: last update: %s node: %s device: %s\n",
289 		       ctime(&t), mmp->mmp_nodename, mmp->mmp_bdevname);
290 	}
291 }
292