1/* vi: set sw=4 ts=4: */
2/*
3 * util.c --- helper functions used by tune2fs and mke2fs
4 *
5 * Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
6 *
7 * %Begin-Header%
8 * This file may be redistributed under the terms of the GNU Public
9 * License.
10 * %End-Header%
11 */
12
13#include <stdio.h>
14#include <string.h>
15#include <errno.h>
16#include <linux/major.h>
17#include <sys/stat.h>
18
19#include "e2fsbb.h"
20#include "e2p/e2p.h"
21#include "ext2fs/ext2_fs.h"
22#include "ext2fs/ext2fs.h"
23#include "blkid/blkid.h"
24#include "util.h"
25
26void proceed_question(void)
27{
28	fputs("Proceed anyway? (y,n) ", stdout);
29	if (bb_ask_confirmation() == 0)
30		exit(1);
31}
32
33void check_plausibility(const char *device, int force)
34{
35	int val;
36	struct stat s;
37	val = stat(device, &s);
38	if (force)
39		return;
40	if(val == -1)
41		bb_perror_msg_and_die("cannot stat %s", device);
42	if (!S_ISBLK(s.st_mode)) {
43		printf("%s is not a block special device.\n", device);
44		proceed_question();
45		return;
46	}
47
48#ifdef HAVE_LINUX_MAJOR_H
49#ifndef MAJOR
50#define MAJOR(dev)	((dev)>>8)
51#define MINOR(dev)	((dev) & 0xff)
52#endif
53#ifndef SCSI_BLK_MAJOR
54#ifdef SCSI_DISK0_MAJOR
55#ifdef SCSI_DISK8_MAJOR
56#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
57  ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR) || \
58  ((M) >= SCSI_DISK8_MAJOR && (M) <= SCSI_DISK15_MAJOR))
59#else
60#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
61  ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR))
62#endif /* defined(SCSI_DISK8_MAJOR) */
63#define SCSI_BLK_MAJOR(M) (SCSI_DISK_MAJOR((M)) || (M) == SCSI_CDROM_MAJOR)
64#else
65#define SCSI_BLK_MAJOR(M)  ((M) == SCSI_DISK_MAJOR || (M) == SCSI_CDROM_MAJOR)
66#endif /* defined(SCSI_DISK0_MAJOR) */
67#endif /* defined(SCSI_BLK_MAJOR) */
68	if (((MAJOR(s.st_rdev) == HD_MAJOR &&
69	      MINOR(s.st_rdev)%64 == 0) ||
70	     (SCSI_BLK_MAJOR(MAJOR(s.st_rdev)) &&
71	      MINOR(s.st_rdev)%16 == 0))) {
72		printf("%s is entire device, not just one partition!\n", device);
73		proceed_question();
74	}
75#endif
76}
77
78void check_mount(const char *device, int force, const char *type)
79{
80	errcode_t retval;
81	int mount_flags;
82
83	retval = ext2fs_check_if_mounted(device, &mount_flags);
84	if (retval) {
85		bb_error_msg("cannot determine if %s is mounted", device);
86		return;
87	}
88	if (mount_flags & EXT2_MF_MOUNTED) {
89		bb_error_msg("%s is mounted !", device);
90force_check:
91		if (force)
92			bb_error_msg("badblocks forced anyways");
93		else
94			bb_error_msg_and_die("it's not safe to run badblocks!");
95	}
96
97	if (mount_flags & EXT2_MF_BUSY) {
98		bb_error_msg("%s is apparently in use by the system", device);
99		goto force_check;
100	}
101
102}
103
104void parse_journal_opts(char **journal_device, int *journal_flags,
105			int *journal_size, const char *opts)
106{
107	char *buf, *token, *next, *p, *arg;
108	int journal_usage = 0;
109	buf = xstrdup(opts);
110	for (token = buf; token && *token; token = next) {
111		p = strchr(token, ',');
112		next = 0;
113		if (p) {
114			*p = 0;
115			next = p+1;
116		}
117		arg = strchr(token, '=');
118		if (arg) {
119			*arg = 0;
120			arg++;
121		}
122		if (strcmp(token, "device") == 0) {
123			*journal_device = blkid_get_devname(NULL, arg, NULL);
124			if (!journal_device) {
125				journal_usage++;
126				continue;
127			}
128		} else if (strcmp(token, "size") == 0) {
129			if (!arg) {
130				journal_usage++;
131				continue;
132			}
133			(*journal_size) = strtoul(arg, &p, 0);
134			if (*p)
135				journal_usage++;
136		} else if (strcmp(token, "v1_superblock") == 0) {
137			(*journal_flags) |= EXT2_MKJOURNAL_V1_SUPER;
138			continue;
139		} else
140			journal_usage++;
141	}
142	if (journal_usage)
143		bb_error_msg_and_die(
144			"\nBad journal options specified.\n\n"
145			"Journal options are separated by commas, "
146			"and may take an argument which\n"
147			"\tis set off by an equals ('=') sign.\n\n"
148			"Valid journal options are:\n"
149			"\tsize=<journal size in megabytes>\n"
150			"\tdevice=<journal device>\n\n"
151			"The journal size must be between "
152			"1024 and 102400 filesystem blocks.\n\n");
153}
154
155/*
156 * Determine the number of journal blocks to use, either via
157 * user-specified # of megabytes, or via some intelligently selected
158 * defaults.
159 *
160 * Find a reasonable journal file size (in blocks) given the number of blocks
161 * in the filesystem.  For very small filesystems, it is not reasonable to
162 * have a journal that fills more than half of the filesystem.
163 */
164int figure_journal_size(int size, ext2_filsys fs)
165{
166	blk_t j_blocks;
167
168	if (fs->super->s_blocks_count < 2048) {
169		bb_error_msg("Filesystem too small for a journal");
170		return 0;
171	}
172
173	if (size >= 0) {
174		j_blocks = size * 1024 / (fs->blocksize	/ 1024);
175		if (j_blocks < 1024 || j_blocks > 102400)
176			bb_error_msg_and_die("\nThe requested journal "
177				"size is %d blocks;\n it must be "
178				"between 1024 and 102400 blocks; Aborting",
179				j_blocks);
180		if (j_blocks > fs->super->s_free_blocks_count)
181			bb_error_msg_and_die("Journal size too big for filesystem");
182		return j_blocks;
183	}
184
185	if (fs->super->s_blocks_count < 32768)
186		j_blocks = 1024;
187	else if (fs->super->s_blocks_count < 256*1024)
188		j_blocks = 4096;
189	else if (fs->super->s_blocks_count < 512*1024)
190		j_blocks = 8192;
191	else if (fs->super->s_blocks_count < 1024*1024)
192		j_blocks = 16384;
193	else
194		j_blocks = 32768;
195
196	return j_blocks;
197}
198
199void print_check_message(ext2_filsys fs)
200{
201	printf("This filesystem will be automatically "
202		 "checked every %d mounts or\n"
203		 "%g days, whichever comes first.  "
204		 "Use tune2fs -c or -i to override.\n",
205	       fs->super->s_max_mnt_count,
206	       (double)fs->super->s_checkinterval / (3600 * 24));
207}
208
209void make_journal_device(char *journal_device, ext2_filsys fs, int quiet, int force)
210{
211	errcode_t	retval;
212	ext2_filsys	jfs;
213	io_manager	io_ptr;
214
215	check_plausibility(journal_device, force);
216	check_mount(journal_device, force, "journal");
217	io_ptr = unix_io_manager;
218	retval = ext2fs_open(journal_device, EXT2_FLAG_RW|
219					EXT2_FLAG_JOURNAL_DEV_OK, 0,
220					fs->blocksize, io_ptr, &jfs);
221	if (retval)
222		bb_error_msg_and_die("cannot journal device %s", journal_device);
223	if(!quiet)
224		printf("Adding journal to device %s: ", journal_device);
225	fflush(stdout);
226	retval = ext2fs_add_journal_device(fs, jfs);
227	if(retval)
228		bb_error_msg_and_die("\nFailed to add journal to device %s", journal_device);
229	if(!quiet)
230		puts("done");
231	ext2fs_close(jfs);
232}
233
234void make_journal_blocks(ext2_filsys fs, int journal_size, int journal_flags, int quiet)
235{
236	unsigned long journal_blocks;
237	errcode_t	retval;
238
239	journal_blocks = figure_journal_size(journal_size, fs);
240	if (!journal_blocks) {
241		fs->super->s_feature_compat &=
242			~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
243		return;
244	}
245	if(!quiet)
246		printf("Creating journal (%ld blocks): ", journal_blocks);
247	fflush(stdout);
248	retval = ext2fs_add_journal_inode(fs, journal_blocks,
249						  journal_flags);
250	if(retval)
251		bb_error_msg_and_die("cannot create journal");
252	if(!quiet)
253		puts("done");
254}
255
256char *e2fs_set_sbin_path(void)
257{
258	char *oldpath = getenv("PATH");
259	/* Update our PATH to include /sbin  */
260#define PATH_SET "/sbin"
261	if (oldpath)
262		oldpath = xasprintf("%s:%s", PATH_SET, oldpath);
263	 else
264		oldpath = PATH_SET;
265	putenv (oldpath);
266	return oldpath;
267}
268