util.c revision 18a1444b4f1e6a0948fd38fa0de382d86cfe04de 
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#include <time.h>
27
28#include "et/com_err.h"
29#include "e2p/e2p.h"
30#include "ext2fs/ext2_fs.h"
31#include "ext2fs/ext2fs.h"
32#include "nls-enable.h"
33#include "blkid/blkid.h"
34#include "util.h"
35
36#ifndef HAVE_STRCASECMP
37int strcasecmp (char *s1, char *s2)
38{
39	while (*s1 && *s2) {
40		int ch1 = *s1++, ch2 = *s2++;
41		if (isupper (ch1))
42			ch1 = tolower (ch1);
43		if (isupper (ch2))
44			ch2 = tolower (ch2);
45		if (ch1 != ch2)
46			return ch1 - ch2;
47	}
48	return *s1 ? 1 : *s2 ? -1 : 0;
49}
50#endif
51
52/*
53 * Given argv[0], return the program name.
54 */
55char *get_progname(char *argv_zero)
56{
57	char	*cp;
58
59	cp = strrchr(argv_zero, '/');
60	if (!cp )
61		return argv_zero;
62	else
63		return cp+1;
64}
65
66void proceed_question(void)
67{
68	char buf[256];
69	const char *short_yes = _("yY");
70
71	fflush(stdout);
72	fflush(stderr);
73	fputs(_("Proceed anyway? (y,n) "), stdout);
74	buf[0] = 0;
75	if (!fgets(buf, sizeof(buf), stdin) ||
76	    strchr(short_yes, buf[0]) == 0)
77		exit(1);
78}
79
80void check_plausibility(const char *device)
81{
82	int val;
83	ext2fs_struct_stat s;
84
85	val = ext2fs_stat(device, &s);
86
87	if(val == -1) {
88		fprintf(stderr, _("Could not stat %s --- %s\n"),
89			device, error_message(errno));
90		if (errno == ENOENT)
91			fputs(_("\nThe device apparently does not exist; "
92				"did you specify it correctly?\n"), stderr);
93		exit(1);
94	}
95#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
96	/* On FreeBSD, all disk devices are character specials */
97	if (!S_ISBLK(s.st_mode) && !S_ISCHR(s.st_mode))
98#else
99	if (!S_ISBLK(s.st_mode))
100#endif
101	{
102		printf(_("%s is not a block special device.\n"), device);
103		proceed_question();
104		return;
105	}
106
107#ifdef HAVE_LINUX_MAJOR_H
108#ifndef MAJOR
109#define MAJOR(dev)	((dev)>>8)
110#define MINOR(dev)	((dev) & 0xff)
111#endif
112#ifndef SCSI_BLK_MAJOR
113#ifdef SCSI_DISK0_MAJOR
114#ifdef SCSI_DISK8_MAJOR
115#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
116  ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR) || \
117  ((M) >= SCSI_DISK8_MAJOR && (M) <= SCSI_DISK15_MAJOR))
118#else
119#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
120  ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR))
121#endif /* defined(SCSI_DISK8_MAJOR) */
122#define SCSI_BLK_MAJOR(M) (SCSI_DISK_MAJOR((M)) || (M) == SCSI_CDROM_MAJOR)
123#else
124#define SCSI_BLK_MAJOR(M)  ((M) == SCSI_DISK_MAJOR || (M) == SCSI_CDROM_MAJOR)
125#endif /* defined(SCSI_DISK0_MAJOR) */
126#endif /* defined(SCSI_BLK_MAJOR) */
127	if (((MAJOR(s.st_rdev) == HD_MAJOR &&
128	      MINOR(s.st_rdev)%64 == 0) ||
129	     (SCSI_BLK_MAJOR(MAJOR(s.st_rdev)) &&
130	      MINOR(s.st_rdev)%16 == 0))) {
131		printf(_("%s is entire device, not just one partition!\n"),
132		       device);
133		proceed_question();
134	}
135#endif
136}
137
138void check_mount(const char *device, int force, const char *type)
139{
140	errcode_t	retval;
141	int		mount_flags;
142
143	retval = ext2fs_check_if_mounted(device, &mount_flags);
144	if (retval) {
145		com_err("ext2fs_check_if_mount", retval,
146			_("while determining whether %s is mounted."),
147			device);
148		return;
149	}
150	if (mount_flags & EXT2_MF_MOUNTED) {
151		fprintf(stderr, _("%s is mounted; "), device);
152		if (force >= 2) {
153			fputs(_("mke2fs forced anyway.  Hope /etc/mtab is "
154				"incorrect.\n"), stderr);
155			return;
156		}
157	abort_mke2fs:
158		fprintf(stderr, _("will not make a %s here!\n"), type);
159		exit(1);
160	}
161	if (mount_flags & EXT2_MF_BUSY) {
162		fprintf(stderr, _("%s is apparently in use by the system; "),
163			device);
164		if (force >= 2) {
165			fputs(_("mke2fs forced anyway.\n"), stderr);
166			return;
167		}
168		goto abort_mke2fs;
169	}
170}
171
172void parse_journal_opts(const char *opts)
173{
174	char	*buf, *token, *next, *p, *arg;
175	int	len;
176	int	journal_usage = 0;
177
178	len = strlen(opts);
179	buf = malloc(len+1);
180	if (!buf) {
181		fputs(_("Couldn't allocate memory to parse journal "
182			"options!\n"), stderr);
183		exit(1);
184	}
185	strcpy(buf, opts);
186	for (token = buf; token && *token; token = next) {
187		p = strchr(token, ',');
188		next = 0;
189		if (p) {
190			*p = 0;
191			next = p+1;
192		}
193		arg = strchr(token, '=');
194		if (arg) {
195			*arg = 0;
196			arg++;
197		}
198#if 0
199		printf("Journal option=%s, argument=%s\n", token,
200		       arg ? arg : "NONE");
201#endif
202		if (strcmp(token, "device") == 0) {
203			journal_device = blkid_get_devname(NULL, arg, NULL);
204			if (!journal_device) {
205				if (arg)
206					fprintf(stderr, _("\nCould not find "
207						"journal device matching %s\n"),
208						arg);
209				journal_usage++;
210				continue;
211			}
212		} else if (strcmp(token, "size") == 0) {
213			if (!arg) {
214				journal_usage++;
215				continue;
216			}
217			journal_size = strtoul(arg, &p, 0);
218			if (*p)
219				journal_usage++;
220		} else if (strcmp(token, "v1_superblock") == 0) {
221			journal_flags |= EXT2_MKJOURNAL_V1_SUPER;
222			continue;
223		} else
224			journal_usage++;
225	}
226	if (journal_usage) {
227		fputs(_("\nBad journal options specified.\n\n"
228			"Journal options are separated by commas, "
229			"and may take an argument which\n"
230			"\tis set off by an equals ('=') sign.\n\n"
231			"Valid journal options are:\n"
232			"\tsize=<journal size in megabytes>\n"
233			"\tdevice=<journal device>\n\n"
234			"The journal size must be between "
235			"1024 and 10240000 filesystem blocks.\n\n"), stderr);
236		free(buf);
237		exit(1);
238	}
239	free(buf);
240}
241
242/*
243 * Determine the number of journal blocks to use, either via
244 * user-specified # of megabytes, or via some intelligently selected
245 * defaults.
246 *
247 * Find a reasonable journal file size (in blocks) given the number of blocks
248 * in the filesystem.  For very small filesystems, it is not reasonable to
249 * have a journal that fills more than half of the filesystem.
250 */
251unsigned int figure_journal_size(int size, ext2_filsys fs)
252{
253	int j_blocks;
254
255	j_blocks = ext2fs_default_journal_size(ext2fs_blocks_count(fs->super));
256	if (j_blocks < 0) {
257		fputs(_("\nFilesystem too small for a journal\n"), stderr);
258		return 0;
259	}
260
261	if (size > 0) {
262		j_blocks = size * 1024 / (fs->blocksize	/ 1024);
263		if (j_blocks < 1024 || j_blocks > 10240000) {
264			fprintf(stderr, _("\nThe requested journal "
265				"size is %d blocks; it must be\n"
266				"between 1024 and 10240000 blocks.  "
267				"Aborting.\n"),
268				j_blocks);
269			exit(1);
270		}
271		if ((unsigned) j_blocks > ext2fs_free_blocks_count(fs->super) / 2) {
272			fputs(_("\nJournal size too big for filesystem.\n"),
273			      stderr);
274			exit(1);
275		}
276	}
277	return j_blocks;
278}
279
280void print_check_message(int mnt, unsigned int check)
281{
282	if (mnt < 0)
283		mnt = 0;
284	if (!mnt && !check)
285		return;
286	printf(_("This filesystem will be automatically "
287		 "checked every %d mounts or\n"
288		 "%g days, whichever comes first.  "
289		 "Use tune2fs -c or -i to override.\n"),
290	       mnt, ((double) check) / (3600 * 24));
291}
292
293void dump_mmp_msg(struct mmp_struct *mmp, const char *msg)
294{
295
296	if (msg)
297		printf("MMP check failed: %s\n", msg);
298	if (mmp) {
299		time_t t = mmp->mmp_time;
300
301		printf("MMP error info: last update: %s node: %s device: %s\n",
302		       ctime(&t), mmp->mmp_nodename, mmp->mmp_bdevname);
303	}
304}
305