util.c revision 65f0aab98b20b5994a726ab90d355248bcddfffd 
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 <stdio.h>
16#include <string.h>
17#ifdef HAVE_ERRNO_H
18#include <errno.h>
19#endif
20#ifdef HAVE_LINUX_MAJOR_H
21#include <linux/major.h>
22#endif
23#ifdef HAVE_SYS_STAT_H
24#include <sys/stat.h>
25#endif
26
27#include "et/com_err.h"
28#include "e2p/e2p.h"
29#include "ext2fs/ext2_fs.h"
30#include "ext2fs/ext2fs.h"
31#include "nls-enable.h"
32#include "blkid/blkid.h"
33#include "util.h"
34
35#ifndef HAVE_STRCASECMP
36int strcasecmp (char *s1, char *s2)
37{
38	while (*s1 && *s2) {
39		int ch1 = *s1++, ch2 = *s2++;
40		if (isupper (ch1))
41			ch1 = tolower (ch1);
42		if (isupper (ch2))
43			ch2 = tolower (ch2);
44		if (ch1 != ch2)
45			return ch1 - ch2;
46	}
47	return *s1 ? 1 : *s2 ? -1 : 0;
48}
49#endif
50
51/*
52 * Given argv[0], return the program name.
53 */
54char *get_progname(char *argv_zero)
55{
56	char	*cp;
57
58	cp = strrchr(argv_zero, '/');
59	if (!cp )
60		return argv_zero;
61	else
62		return cp+1;
63}
64
65void proceed_question(void)
66{
67	char buf[256];
68	const char *short_yes = _("yY");
69
70	fflush(stdout);
71	fflush(stderr);
72	fputs(_("Proceed anyway? (y,n) "), stdout);
73	buf[0] = 0;
74	if (!fgets(buf, sizeof(buf), stdin) ||
75	    strchr(short_yes, buf[0]) == 0)
76		exit(1);
77}
78
79void check_plausibility(const char *device)
80{
81	int val;
82#ifdef HAVE_OPEN64
83	struct stat64 s;
84
85	val = stat64(device, &s);
86#else
87	struct stat s;
88
89	val = stat(device, &s);
90#endif
91
92	if(val == -1) {
93		fprintf(stderr, _("Could not stat %s --- %s\n"),
94			device, error_message(errno));
95		if (errno == ENOENT)
96			fputs(_("\nThe device apparently does not exist; "
97				"did you specify it correctly?\n"), stderr);
98		exit(1);
99	}
100#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
101	/* On FreeBSD, all disk devices are character specials */
102	if (!S_ISBLK(s.st_mode) && !S_ISCHR(s.st_mode))
103#else
104	if (!S_ISBLK(s.st_mode))
105#endif
106	{
107		printf(_("%s is not a block special device.\n"), device);
108		proceed_question();
109		return;
110	}
111
112#ifdef HAVE_LINUX_MAJOR_H
113#ifndef MAJOR
114#define MAJOR(dev)	((dev)>>8)
115#define MINOR(dev)	((dev) & 0xff)
116#endif
117#ifndef SCSI_BLK_MAJOR
118#ifdef SCSI_DISK0_MAJOR
119#ifdef SCSI_DISK8_MAJOR
120#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
121  ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR) || \
122  ((M) >= SCSI_DISK8_MAJOR && (M) <= SCSI_DISK15_MAJOR))
123#else
124#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
125  ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR))
126#endif /* defined(SCSI_DISK8_MAJOR) */
127#define SCSI_BLK_MAJOR(M) (SCSI_DISK_MAJOR((M)) || (M) == SCSI_CDROM_MAJOR)
128#else
129#define SCSI_BLK_MAJOR(M)  ((M) == SCSI_DISK_MAJOR || (M) == SCSI_CDROM_MAJOR)
130#endif /* defined(SCSI_DISK0_MAJOR) */
131#endif /* defined(SCSI_BLK_MAJOR) */
132	if (((MAJOR(s.st_rdev) == HD_MAJOR &&
133	      MINOR(s.st_rdev)%64 == 0) ||
134	     (SCSI_BLK_MAJOR(MAJOR(s.st_rdev)) &&
135	      MINOR(s.st_rdev)%16 == 0))) {
136		printf(_("%s is entire device, not just one partition!\n"),
137		       device);
138		proceed_question();
139	}
140#endif
141}
142
143void check_mount(const char *device, int force, const char *type)
144{
145	errcode_t	retval;
146	int		mount_flags;
147
148	retval = ext2fs_check_if_mounted(device, &mount_flags);
149	if (retval) {
150		com_err("ext2fs_check_if_mount", retval,
151			_("while determining whether %s is mounted."),
152			device);
153		return;
154	}
155	if (mount_flags & EXT2_MF_MOUNTED) {
156		fprintf(stderr, _("%s is mounted; "), device);
157		if (force > 2) {
158			fputs(_("mke2fs forced anyway.  Hope /etc/mtab is "
159				"incorrect.\n"), stderr);
160			return;
161		}
162	abort_mke2fs:
163		fprintf(stderr, _("will not make a %s here!\n"), type);
164		exit(1);
165	}
166	if (mount_flags & EXT2_MF_BUSY) {
167		fprintf(stderr, _("%s is apparently in use by the system; "),
168			device);
169		if (force > 2) {
170			fputs(_("mke2fs forced anyway.\n"), stderr);
171			return;
172		}
173		goto abort_mke2fs;
174	}
175}
176
177void parse_journal_opts(const char *opts)
178{
179	char	*buf, *token, *next, *p, *arg;
180	int	len;
181	int	journal_usage = 0;
182
183	len = strlen(opts);
184	buf = malloc(len+1);
185	if (!buf) {
186		fputs(_("Couldn't allocate memory to parse journal "
187			"options!\n"), stderr);
188		exit(1);
189	}
190	strcpy(buf, opts);
191	for (token = buf; token && *token; token = next) {
192		p = strchr(token, ',');
193		next = 0;
194		if (p) {
195			*p = 0;
196			next = p+1;
197		}
198		arg = strchr(token, '=');
199		if (arg) {
200			*arg = 0;
201			arg++;
202		}
203#if 0
204		printf("Journal option=%s, argument=%s\n", token,
205		       arg ? arg : "NONE");
206#endif
207		if (strcmp(token, "device") == 0) {
208			journal_device = blkid_get_devname(NULL, arg, NULL);
209			if (!journal_device) {
210				if (arg)
211					fprintf(stderr, _("\nCould not find "
212						"journal device matching %s\n"),
213						arg);
214				journal_usage++;
215				continue;
216			}
217		} else if (strcmp(token, "size") == 0) {
218			if (!arg) {
219				journal_usage++;
220				continue;
221			}
222			journal_size = strtoul(arg, &p, 0);
223			if (*p)
224				journal_usage++;
225		} else if (strcmp(token, "v1_superblock") == 0) {
226			journal_flags |= EXT2_MKJOURNAL_V1_SUPER;
227			continue;
228		} else
229			journal_usage++;
230	}
231	if (journal_usage) {
232		fputs(_("\nBad journal options specified.\n\n"
233			"Journal options are separated by commas, "
234			"and may take an argument which\n"
235			"\tis set off by an equals ('=') sign.\n\n"
236			"Valid journal options are:\n"
237			"\tsize=<journal size in megabytes>\n"
238			"\tdevice=<journal device>\n\n"
239			"The journal size must be between "
240			"1024 and 10240000 filesystem blocks.\n\n"), stderr);
241		free(buf);
242		exit(1);
243	}
244	free(buf);
245}
246
247/*
248 * Determine the number of journal blocks to use, either via
249 * user-specified # of megabytes, or via some intelligently selected
250 * defaults.
251 *
252 * Find a reasonable journal file size (in blocks) given the number of blocks
253 * in the filesystem.  For very small filesystems, it is not reasonable to
254 * have a journal that fills more than half of the filesystem.
255 */
256unsigned int figure_journal_size(int size, ext2_filsys fs)
257{
258	int j_blocks;
259
260	j_blocks = ext2fs_default_journal_size(fs->super->s_blocks_count);
261	if (j_blocks < 0) {
262		fputs(_("\nFilesystem too small for a journal\n"), stderr);
263		return 0;
264	}
265
266	if (size > 0) {
267		j_blocks = size * 1024 / (fs->blocksize	/ 1024);
268		if (j_blocks < 1024 || j_blocks > 10240000) {
269			fprintf(stderr, _("\nThe requested journal "
270				"size is %d blocks; it must be\n"
271				"between 1024 and 10240000 blocks.  "
272				"Aborting.\n"),
273				j_blocks);
274			exit(1);
275		}
276		if ((unsigned) j_blocks > fs->super->s_free_blocks_count / 2) {
277			fputs(_("\nJournal size too big for filesystem.\n"),
278			      stderr);
279			exit(1);
280		}
281	}
282	return j_blocks;
283}
284
285void print_check_message(ext2_filsys fs)
286{
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	       fs->super->s_max_mnt_count,
292	       (double)fs->super->s_checkinterval / (3600 * 24));
293}
294