util.c revision 82896cbe0e83fc084abbe1ae2f043d2ec9058963 
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#define _LARGEFILE_SOURCE
13#define _LARGEFILE64_SOURCE
14
15#include "config.h"
16#include <stdio.h>
17#include <string.h>
18#ifdef HAVE_ERRNO_H
19#include <errno.h>
20#endif
21#ifdef HAVE_LINUX_MAJOR_H
22#include <linux/major.h>
23#endif
24#ifdef HAVE_SYS_STAT_H
25#include <sys/stat.h>
26#endif
27#include <time.h>
28
29#include "et/com_err.h"
30#include "e2p/e2p.h"
31#include "ext2fs/ext2_fs.h"
32#include "ext2fs/ext2fs.h"
33#include "nls-enable.h"
34#include "blkid/blkid.h"
35#include "util.h"
36
37#ifndef HAVE_STRCASECMP
38int strcasecmp (char *s1, char *s2)
39{
40	while (*s1 && *s2) {
41		int ch1 = *s1++, ch2 = *s2++;
42		if (isupper (ch1))
43			ch1 = tolower (ch1);
44		if (isupper (ch2))
45			ch2 = tolower (ch2);
46		if (ch1 != ch2)
47			return ch1 - ch2;
48	}
49	return *s1 ? 1 : *s2 ? -1 : 0;
50}
51#endif
52
53/*
54 * Given argv[0], return the program name.
55 */
56char *get_progname(char *argv_zero)
57{
58	char	*cp;
59
60	cp = strrchr(argv_zero, '/');
61	if (!cp )
62		return argv_zero;
63	else
64		return cp+1;
65}
66
67void proceed_question(void)
68{
69	char buf[256];
70	const char *short_yes = _("yY");
71
72	fflush(stdout);
73	fflush(stderr);
74	fputs(_("Proceed anyway? (y,n) "), stdout);
75	buf[0] = 0;
76	if (!fgets(buf, sizeof(buf), stdin) ||
77	    strchr(short_yes, buf[0]) == 0)
78		exit(1);
79}
80
81void check_plausibility(const char *device)
82{
83	int val;
84	ext2fs_struct_stat s;
85
86	val = ext2fs_stat(device, &s);
87
88	if(val == -1) {
89		fprintf(stderr, _("Could not stat %s --- %s\n"),
90			device, error_message(errno));
91		if (errno == ENOENT)
92			fputs(_("\nThe device apparently does not exist; "
93				"did you specify it correctly?\n"), stderr);
94		exit(1);
95	}
96#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
97	/* On FreeBSD, all disk devices are character specials */
98	if (!S_ISBLK(s.st_mode) && !S_ISCHR(s.st_mode))
99#else
100	if (!S_ISBLK(s.st_mode))
101#endif
102	{
103		printf(_("%s is not a block special device.\n"), device);
104		proceed_question();
105		return;
106	}
107
108#ifdef HAVE_LINUX_MAJOR_H
109#ifndef MAJOR
110#define MAJOR(dev)	((dev)>>8)
111#define MINOR(dev)	((dev) & 0xff)
112#endif
113#ifndef SCSI_BLK_MAJOR
114#ifdef SCSI_DISK0_MAJOR
115#ifdef SCSI_DISK8_MAJOR
116#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
117  ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR) || \
118  ((M) >= SCSI_DISK8_MAJOR && (M) <= SCSI_DISK15_MAJOR))
119#else
120#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
121  ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR))
122#endif /* defined(SCSI_DISK8_MAJOR) */
123#define SCSI_BLK_MAJOR(M) (SCSI_DISK_MAJOR((M)) || (M) == SCSI_CDROM_MAJOR)
124#else
125#define SCSI_BLK_MAJOR(M)  ((M) == SCSI_DISK_MAJOR || (M) == SCSI_CDROM_MAJOR)
126#endif /* defined(SCSI_DISK0_MAJOR) */
127#endif /* defined(SCSI_BLK_MAJOR) */
128	if (((MAJOR(s.st_rdev) == HD_MAJOR &&
129	      MINOR(s.st_rdev)%64 == 0) ||
130	     (SCSI_BLK_MAJOR(MAJOR(s.st_rdev)) &&
131	      MINOR(s.st_rdev)%16 == 0))) {
132		printf(_("%s is entire device, not just one partition!\n"),
133		       device);
134		proceed_question();
135	}
136#endif
137}
138
139void check_mount(const char *device, int force, const char *type)
140{
141	errcode_t	retval;
142	int		mount_flags;
143
144	retval = ext2fs_check_if_mounted(device, &mount_flags);
145	if (retval) {
146		com_err("ext2fs_check_if_mount", retval,
147			_("while determining whether %s is mounted."),
148			device);
149		return;
150	}
151	if (mount_flags & EXT2_MF_MOUNTED) {
152		fprintf(stderr, _("%s is mounted; "), device);
153		if (force >= 2) {
154			fputs(_("mke2fs forced anyway.  Hope /etc/mtab is "
155				"incorrect.\n"), stderr);
156			return;
157		}
158	abort_mke2fs:
159		fprintf(stderr, _("will not make a %s here!\n"), type);
160		exit(1);
161	}
162	if (mount_flags & EXT2_MF_BUSY) {
163		fprintf(stderr, _("%s is apparently in use by the system; "),
164			device);
165		if (force >= 2) {
166			fputs(_("mke2fs forced anyway.\n"), stderr);
167			return;
168		}
169		goto abort_mke2fs;
170	}
171}
172
173void parse_journal_opts(const char *opts)
174{
175	char	*buf, *token, *next, *p, *arg;
176	int	len;
177	int	journal_usage = 0;
178
179	len = strlen(opts);
180	buf = malloc(len+1);
181	if (!buf) {
182		fputs(_("Couldn't allocate memory to parse journal "
183			"options!\n"), stderr);
184		exit(1);
185	}
186	strcpy(buf, opts);
187	for (token = buf; token && *token; token = next) {
188		p = strchr(token, ',');
189		next = 0;
190		if (p) {
191			*p = 0;
192			next = p+1;
193		}
194		arg = strchr(token, '=');
195		if (arg) {
196			*arg = 0;
197			arg++;
198		}
199#if 0
200		printf("Journal option=%s, argument=%s\n", token,
201		       arg ? arg : "NONE");
202#endif
203		if (strcmp(token, "device") == 0) {
204			journal_device = blkid_get_devname(NULL, arg, NULL);
205			if (!journal_device) {
206				if (arg)
207					fprintf(stderr, _("\nCould not find "
208						"journal device matching %s\n"),
209						arg);
210				journal_usage++;
211				continue;
212			}
213		} else if (strcmp(token, "size") == 0) {
214			if (!arg) {
215				journal_usage++;
216				continue;
217			}
218			journal_size = strtoul(arg, &p, 0);
219			if (*p)
220				journal_usage++;
221		} else if (strcmp(token, "v1_superblock") == 0) {
222			journal_flags |= EXT2_MKJOURNAL_V1_SUPER;
223			continue;
224		} else
225			journal_usage++;
226	}
227	if (journal_usage) {
228		fputs(_("\nBad journal options specified.\n\n"
229			"Journal options are separated by commas, "
230			"and may take an argument which\n"
231			"\tis set off by an equals ('=') sign.\n\n"
232			"Valid journal options are:\n"
233			"\tsize=<journal size in megabytes>\n"
234			"\tdevice=<journal device>\n\n"
235			"The journal size must be between "
236			"1024 and 10240000 filesystem blocks.\n\n"), stderr);
237		free(buf);
238		exit(1);
239	}
240	free(buf);
241}
242
243/*
244 * Determine the number of journal blocks to use, either via
245 * user-specified # of megabytes, or via some intelligently selected
246 * defaults.
247 *
248 * Find a reasonable journal file size (in blocks) given the number of blocks
249 * in the filesystem.  For very small filesystems, it is not reasonable to
250 * have a journal that fills more than half of the filesystem.
251 */
252unsigned int figure_journal_size(int size, ext2_filsys fs)
253{
254	int j_blocks;
255
256	j_blocks = ext2fs_default_journal_size(ext2fs_blocks_count(fs->super));
257	if (j_blocks < 0) {
258		fputs(_("\nFilesystem too small for a journal\n"), stderr);
259		return 0;
260	}
261
262	if (size > 0) {
263		j_blocks = size * 1024 / (fs->blocksize	/ 1024);
264		if (j_blocks < 1024 || j_blocks > 10240000) {
265			fprintf(stderr, _("\nThe requested journal "
266				"size is %d blocks; it must be\n"
267				"between 1024 and 10240000 blocks.  "
268				"Aborting.\n"),
269				j_blocks);
270			exit(1);
271		}
272		if ((unsigned) j_blocks > ext2fs_free_blocks_count(fs->super) / 2) {
273			fputs(_("\nJournal size too big for filesystem.\n"),
274			      stderr);
275			exit(1);
276		}
277	}
278	return j_blocks;
279}
280
281void print_check_message(int mnt, unsigned int check)
282{
283	if (mnt < 0)
284		mnt = 0;
285	if (!mnt && !check)
286		return;
287	printf(_("This filesystem will be automatically "
288		 "checked every %d mounts or\n"
289		 "%g days, whichever comes first.  "
290		 "Use tune2fs -c or -i to override.\n"),
291	       mnt, ((double) check) / (3600 * 24));
292}
293
294void dump_mmp_msg(struct mmp_struct *mmp, const char *msg)
295{
296
297	if (msg)
298		printf("MMP check failed: %s\n", msg);
299	if (mmp) {
300		time_t t = mmp->mmp_time;
301
302		printf("MMP error info: last update: %s node: %s device: %s\n",
303		       ctime(&t), mmp->mmp_nodename, mmp->mmp_bdevname);
304	}
305}
306