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      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
     37 int 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  */
     55 char *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 
     66 void 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 
     80 void 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 
    138 void 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 
    172 void 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  */
    251 unsigned 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 
    280 void 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 
    293 void 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