summaryrefslogtreecommitdiff
path: root/e2fsprogs/old_e2fsprogs/util.c
blob: b30c294b8b654c9d79004fc00961c3f75660bbf6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
/* vi: set sw=4 ts=4: */
/*
 * util.c --- helper functions used by tune2fs and mke2fs
 *
 * Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <linux/major.h>
#include <sys/stat.h>

#include "e2fsbb.h"
#include "e2p/e2p.h"
#include "ext2fs/ext2_fs.h"
#include "ext2fs/ext2fs.h"
#include "blkid/blkid.h"
#include "util.h"

void proceed_question(void)
{
	fputs("Proceed anyway? (y,n) ", stdout);
	if (bb_ask_confirmation() == 0)
		exit(1);
}

void check_plausibility(const char *device, int force)
{
	int val;
	struct stat s;
	val = stat(device, &s);
	if (force)
		return;
	if(val == -1)
		bb_perror_msg_and_die("cannot stat %s", device);
	if (!S_ISBLK(s.st_mode)) {
		printf("%s is not a block special device.\n", device);
		proceed_question();
		return;
	}

#ifdef HAVE_LINUX_MAJOR_H
#ifndef MAJOR
#define MAJOR(dev)	((dev)>>8)
#define MINOR(dev)	((dev) & 0xff)
#endif
#ifndef SCSI_BLK_MAJOR
#ifdef SCSI_DISK0_MAJOR
#ifdef SCSI_DISK8_MAJOR
#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
  ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR) || \
  ((M) >= SCSI_DISK8_MAJOR && (M) <= SCSI_DISK15_MAJOR))
#else
#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
  ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR))
#endif /* defined(SCSI_DISK8_MAJOR) */
#define SCSI_BLK_MAJOR(M) (SCSI_DISK_MAJOR((M)) || (M) == SCSI_CDROM_MAJOR)
#else
#define SCSI_BLK_MAJOR(M)  ((M) == SCSI_DISK_MAJOR || (M) == SCSI_CDROM_MAJOR)
#endif /* defined(SCSI_DISK0_MAJOR) */
#endif /* defined(SCSI_BLK_MAJOR) */
	if (((MAJOR(s.st_rdev) == HD_MAJOR &&
	      MINOR(s.st_rdev)%64 == 0) ||
	     (SCSI_BLK_MAJOR(MAJOR(s.st_rdev)) &&
	      MINOR(s.st_rdev)%16 == 0))) {
		printf("%s is entire device, not just one partition!\n", device);
		proceed_question();
	}
#endif
}

void check_mount(const char *device, int force, const char *type)
{
	errcode_t retval;
	int mount_flags;

	retval = ext2fs_check_if_mounted(device, &mount_flags);
	if (retval) {
		bb_error_msg("cannot determine if %s is mounted", device);
		return;
	}
	if (mount_flags & EXT2_MF_MOUNTED) {
		bb_error_msg("%s is mounted !", device);
force_check:
		if (force)
			bb_error_msg("badblocks forced anyways");
		else
			bb_error_msg_and_die("it's not safe to run badblocks!");
	}

	if (mount_flags & EXT2_MF_BUSY) {
		bb_error_msg("%s is apparently in use by the system", device);
		goto force_check;
	}

}

void parse_journal_opts(char **journal_device, int *journal_flags,
			int *journal_size, const char *opts)
{
	char *buf, *token, *next, *p, *arg;
	int journal_usage = 0;
	buf = xstrdup(opts);
	for (token = buf; token && *token; token = next) {
		p = strchr(token, ',');
		next = 0;
		if (p) {
			*p = 0;
			next = p+1;
		}
		arg = strchr(token, '=');
		if (arg) {
			*arg = 0;
			arg++;
		}
		if (strcmp(token, "device") == 0) {
			*journal_device = blkid_get_devname(NULL, arg, NULL);
			if (!journal_device) {
				journal_usage++;
				continue;
			}
		} else if (strcmp(token, "size") == 0) {
			if (!arg) {
				journal_usage++;
				continue;
			}
			(*journal_size) = strtoul(arg, &p, 0);
			if (*p)
				journal_usage++;
		} else if (strcmp(token, "v1_superblock") == 0) {
			(*journal_flags) |= EXT2_MKJOURNAL_V1_SUPER;
			continue;
		} else
			journal_usage++;
	}
	if (journal_usage)
		bb_error_msg_and_die(
			"\nBad journal options specified.\n\n"
			"Journal options are separated by commas, "
			"and may take an argument which\n"
			"\tis set off by an equals ('=') sign.\n\n"
			"Valid journal options are:\n"
			"\tsize=<journal size in megabytes>\n"
			"\tdevice=<journal device>\n\n"
			"The journal size must be between "
			"1024 and 102400 filesystem blocks.\n\n");
}

/*
 * Determine the number of journal blocks to use, either via
 * user-specified # of megabytes, or via some intelligently selected
 * defaults.
 *
 * Find a reasonable journal file size (in blocks) given the number of blocks
 * in the filesystem.  For very small filesystems, it is not reasonable to
 * have a journal that fills more than half of the filesystem.
 */
int figure_journal_size(int size, ext2_filsys fs)
{
	blk_t j_blocks;

	if (fs->super->s_blocks_count < 2048) {
		bb_error_msg("Filesystem too small for a journal");
		return 0;
	}

	if (size >= 0) {
		j_blocks = size * 1024 / (fs->blocksize	/ 1024);
		if (j_blocks < 1024 || j_blocks > 102400)
			bb_error_msg_and_die("\nThe requested journal "
				"size is %d blocks;\n it must be "
				"between 1024 and 102400 blocks; Aborting",
				j_blocks);
		if (j_blocks > fs->super->s_free_blocks_count)
			bb_error_msg_and_die("Journal size too big for filesystem");
		return j_blocks;
	}

	if (fs->super->s_blocks_count < 32768)
		j_blocks = 1024;
	else if (fs->super->s_blocks_count < 256*1024)
		j_blocks = 4096;
	else if (fs->super->s_blocks_count < 512*1024)
		j_blocks = 8192;
	else if (fs->super->s_blocks_count < 1024*1024)
		j_blocks = 16384;
	else
		j_blocks = 32768;

	return j_blocks;
}

void print_check_message(ext2_filsys fs)
{
	printf("This filesystem will be automatically "
		 "checked every %d mounts or\n"
		 "%g days, whichever comes first.  "
		 "Use tune2fs -c or -i to override.\n",
	       fs->super->s_max_mnt_count,
	       (double)fs->super->s_checkinterval / (3600 * 24));
}

void make_journal_device(char *journal_device, ext2_filsys fs, int quiet, int force)
{
	errcode_t	retval;
	ext2_filsys	jfs;
	io_manager	io_ptr;

	check_plausibility(journal_device, force);
	check_mount(journal_device, force, "journal");
	io_ptr = unix_io_manager;
	retval = ext2fs_open(journal_device, EXT2_FLAG_RW|
					EXT2_FLAG_JOURNAL_DEV_OK, 0,
					fs->blocksize, io_ptr, &jfs);
	if (retval)
		bb_error_msg_and_die("cannot journal device %s", journal_device);
	if(!quiet)
		printf("Adding journal to device %s: ", journal_device);
	fflush(stdout);
	retval = ext2fs_add_journal_device(fs, jfs);
	if(retval)
		bb_error_msg_and_die("\nFailed to add journal to device %s", journal_device);
	if(!quiet)
		puts("done");
	ext2fs_close(jfs);
}

void make_journal_blocks(ext2_filsys fs, int journal_size, int journal_flags, int quiet)
{
	unsigned long journal_blocks;
	errcode_t	retval;

	journal_blocks = figure_journal_size(journal_size, fs);
	if (!journal_blocks) {
		fs->super->s_feature_compat &=
			~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
		return;
	}
	if(!quiet)
		printf("Creating journal (%ld blocks): ", journal_blocks);
	fflush(stdout);
	retval = ext2fs_add_journal_inode(fs, journal_blocks,
						  journal_flags);
	if(retval)
		bb_error_msg_and_die("cannot create journal");
	if(!quiet)
		puts("done");
}

char *e2fs_set_sbin_path(void)
{
	char *oldpath = getenv("PATH");
	/* Update our PATH to include /sbin  */
#define PATH_SET "/sbin"
	if (oldpath)
		oldpath = xasprintf("%s:%s", PATH_SET, oldpath);
	 else
		oldpath = PATH_SET;
	putenv (oldpath);
	return oldpath;
}