util.c revision 2537b6d0c1aa9710a05cdfafc281b4884c67bdb2 
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#include <stdio.h>
13#include <string.h>
14#ifdef HAVE_ERRNO_H
15#include <errno.h>
16#endif
17#include <linux/ext2_fs.h>
18#ifdef HAVE_LINUX_MAJOR_H
19#include <linux/major.h>
20#include <sys/stat.h>
21#endif
22
23#include "et/com_err.h"
24#include "e2p/e2p.h"
25#include "ext2fs/ext2fs.h"
26#include "nls-enable.h"
27#include "util.h"
28
29#ifndef HAVE_STRCASECMP
30int strcasecmp (char *s1, char *s2)
31{
32	while (*s1 && *s2) {
33		int ch1 = *s1++, ch2 = *s2++;
34		if (isupper (ch1))
35			ch1 = tolower (ch1);
36		if (isupper (ch2))
37			ch2 = tolower (ch2);
38		if (ch1 != ch2)
39			return ch1 - ch2;
40	}
41	return *s1 ? 1 : *s2 ? -1 : 0;
42}
43#endif
44
45void proceed_question(void)
46{
47	char buf[256];
48	const char *short_yes = _("yY");
49
50	fflush(stdout);
51	fflush(stderr);
52	printf(_("Proceed anyway? (y,n) "));
53	buf[0] = 0;
54	fgets(buf, sizeof(buf), stdin);
55	if (strchr(short_yes, buf[0]) == 0)
56		exit(1);
57}
58
59void check_plausibility(const char *device)
60{
61	int val;
62	struct stat s;
63
64	val = stat(device, &s);
65
66	if(val == -1) {
67		fprintf(stderr, _("Could not stat %s --- %s\n"),
68			device, error_message(errno));
69		if (errno == ENOENT)
70			fprintf(stderr, _("\nThe device apparently does "
71			       "not exist; did you specify it correctly?\n"));
72		exit(1);
73	}
74	if (!S_ISBLK(s.st_mode)) {
75		printf(_("%s is not a block special device.\n"), device);
76		proceed_question();
77		return;
78	}
79
80#ifdef HAVE_LINUX_MAJOR_H
81#ifndef MAJOR
82#define MAJOR(dev)	((dev)>>8)
83#define MINOR(dev)	((dev) & 0xff)
84#endif
85#ifndef SCSI_BLK_MAJOR
86#define SCSI_BLK_MAJOR(M)  ((M) == SCSI_DISK_MAJOR || (M) == SCSI_CDROM_MAJOR)
87#endif
88	if (((MAJOR(s.st_rdev) == HD_MAJOR &&
89	      MINOR(s.st_rdev)%64 == 0) ||
90	     (SCSI_BLK_MAJOR(MAJOR(s.st_rdev)) &&
91	      MINOR(s.st_rdev)%16 == 0))) {
92		printf(_("%s is entire device, not just one partition!\n"),
93		       device);
94		proceed_question();
95	}
96#endif
97}
98
99void check_mount(const char *device, int force, const char *type)
100{
101	errcode_t	retval;
102	int		mount_flags;
103
104	retval = ext2fs_check_if_mounted(device, &mount_flags);
105	if (retval) {
106		com_err("ext2fs_check_if_mount", retval,
107			_("while determining whether %s is mounted."),
108			device);
109		return;
110	}
111	if (!(mount_flags & EXT2_MF_MOUNTED))
112		return;
113
114	fprintf(stderr, _("%s is mounted; "), device);
115	if (force) {
116		fprintf(stderr, _("mke2fs forced anyway.  "
117			"Hope /etc/mtab is incorrect.\n"));
118	} else {
119		fprintf(stderr, _("will not make a %s here!\n"), type);
120		exit(1);
121	}
122}
123
124void parse_journal_opts(const char *opts)
125{
126	char	*buf, *token, *next, *p, *arg;
127	int	len;
128	int	journal_usage = 0;
129
130	len = strlen(opts);
131	buf = malloc(len+1);
132	if (!buf) {
133		fprintf(stderr, _("Couldn't allocate memory to parse "
134			"journal options!\n"));
135		exit(1);
136	}
137	strcpy(buf, opts);
138	for (token = buf; token && *token; token = next) {
139		p = strchr(token, ',');
140		next = 0;
141		if (p) {
142			*p = 0;
143			next = p+1;
144		}
145		arg = strchr(token, '=');
146		if (arg) {
147			*arg = 0;
148			arg++;
149		}
150#if 0
151		printf("Journal option=%s, argument=%s\n", token,
152		       arg ? arg : "NONE");
153#endif
154		if (strcmp(token, "device") == 0) {
155			if (!arg) {
156				journal_usage++;
157				continue;
158			}
159			journal_device = arg;
160		} else if (strcmp(token, "size") == 0) {
161			if (!arg) {
162				journal_usage++;
163				continue;
164			}
165			journal_size = strtoul(arg, &p, 0);
166			if (*p)
167				journal_usage++;
168		} else if (strcmp(token, "v1_superblock") == 0) {
169			journal_flags |= EXT2_MKJOURNAL_V1_SUPER;
170			continue;
171		} else {
172			journal_size = strtoul(token, &p, 0);
173			if (*p)
174				journal_usage++;
175		}
176	}
177	if (journal_usage) {
178		fprintf(stderr, _("\nBad journal options specified.\n\n"
179			"Journal options are separated by commas, "
180			"and may take an argument which\n"
181			"\tis set off by an equals ('=') sign.\n\n"
182			"Valid raid options are:\n"
183			"\tsize=<journal size in megabytes>\n"
184			"\tdevice=<journal device>\n\n"
185			"The journal size must be between "
186			"1024 and 102400 filesystem blocks.\n\n" ));
187		exit(1);
188	}
189}
190
191/*
192 * Determine the number of journal blocks to use, either via
193 * user-specified # of megabytes, or via some intelligently selected
194 * defaults.
195 *
196 * Find a reasonable journal file size (in blocks) given the number of blocks
197 * in the filesystem.  For very small filesystems, it is not reasonable to
198 * have a journal that fills more than half of the filesystem.
199 */
200int figure_journal_size(int journal_size, ext2_filsys fs)
201{
202	blk_t j_blocks;
203
204	if (fs->super->s_blocks_count < 2048) {
205		fprintf(stderr, _("\nFilesystem too small for a journal\n"));
206		return 0;
207	}
208
209	if (journal_size >= 0) {
210		j_blocks = journal_size * 1024 /
211			(fs->blocksize	/ 1024);
212		if (j_blocks < 1024 || j_blocks > 102400) {
213			fprintf(stderr, _("\nThe requested journal "
214				"size is %d blocks; it must be\n"
215				"between 1024 and 102400 blocks.  "
216				"Aborting.\n"),
217				j_blocks);
218			exit(1);
219		}
220		if (j_blocks > fs->super->s_free_blocks_count) {
221			fprintf(stderr, _("\nJournal size too big "
222					  "for filesystem.\n"));
223			exit(1);
224		}
225		return j_blocks;
226	}
227
228	if (fs->super->s_blocks_count < 32768)
229		j_blocks = 1024;
230	else if (fs->super->s_blocks_count < 262144)
231		j_blocks = 4096;
232	else
233		j_blocks = 8192;
234
235	return j_blocks;
236}
237
238