misc/util.c

   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 #ifndef _LARGEFILE_SOURCE
  13 #define _LARGEFILE_SOURCE
  14 #endif
  15 #ifndef _LARGEFILE64_SOURCE
  16 #define _LARGEFILE64_SOURCE
  17 #endif
  18
  19 #include "config.h"
  20 #include <fcntl.h>
  21 #include <setjmp.h>
  22 #include <signal.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25 #ifdef HAVE_ERRNO_H
  26 #include <errno.h>
  27 #endif
  28 #if HAVE_UNISTD_H
  29 #include <unistd.h>
  30 #endif
  31 #ifdef HAVE_LINUX_MAJOR_H
  32 #include <linux/major.h>
  33 #endif
  34 #include <sys/types.h>
  35 #ifdef HAVE_SYS_STAT_H
  36 #include <sys/stat.h>
  37 #endif
  38 #ifdef HAVE_UNISTD_H
  39 #include <unistd.h>
  40 #endif
  41 #include <time.h>
  42
  43 #include "et/com_err.h"
  44 #include "e2p/e2p.h"
  45 #include "ext2fs/ext2_fs.h"
  46 #include "ext2fs/ext2fs.h"
  47 #include "support/nls-enable.h"
  48 #include "blkid/blkid.h"
  49 #include "util.h"
  50
  51 char *journal_location_string = NULL;
  52
  53 #ifndef HAVE_STRCASECMP
  54 int strcasecmp (char *s1, char *s2)
  55 {
  56         while (*s1 && *s2) {
  57                 int ch1 = *s1++, ch2 = *s2++;
  58                 if (isupper (ch1))
  59                         ch1 = tolower (ch1);
  60                 if (isupper (ch2))
  61                         ch2 = tolower (ch2);
  62                 if (ch1 != ch2)
  63                         return ch1 - ch2;
  64         }
  65         return *s1 ? 1 : *s2 ? -1 : 0;
  66 }
  67 #endif
  68
  69 /*
  70  * Given argv[0], return the program name.
  71  */
  72 char *get_progname(char *argv_zero)
  73 {
  74         char    *cp;
  75
  76         cp = strrchr(argv_zero, '/');
  77         if (!cp )
  78                 return argv_zero;
  79         else
  80                 return cp+1;
  81 }
  82
  83 static jmp_buf alarm_env;
  84
  85 static void alarm_signal(int signal EXT2FS_ATTR((unused)))
  86 {
  87         longjmp(alarm_env, 1);
  88 }
  89
  90 void proceed_question(int delay)
  91 {
  92         char buf[256];
  93         const char *short_yes = _("yY");
  94         const char *english_yes = "yY";
  95
  96         fflush(stdout);
  97         fflush(stderr);
  98         if (delay > 0) {
  99                 if (setjmp(alarm_env)) {
 100                         signal(SIGALRM, SIG_IGN);
 101                         printf("%s", _("<proceeding>\n"));
 102                         return;
 103                 }
 104                 signal(SIGALRM, alarm_signal);
 105                 printf(_("Proceed anyway (or wait %d seconds to proceed) ? (y,N) "),
 106                        delay);
 107                 alarm(delay);
 108         } else
 109                 fputs(_("Proceed anyway? (y,N) "), stdout);
 110         buf[0] = 0;
 111         if (!fgets(buf, sizeof(buf), stdin) ||
 112             strchr(_("nN"), buf[0]) ||
 113             !(strchr(short_yes, buf[0]) ||
 114               strchr(english_yes, buf[0]))) {
 115                 putc('\n', stdout);
 116                 exit(1);
 117         }
 118         signal(SIGALRM, SIG_IGN);
 119 }
 120
 121 void check_mount(const char *device, int force, const char *type)
 122 {
 123         errcode_t       retval;
 124         int             mount_flags;
 125
 126         retval = ext2fs_check_if_mounted(device, &mount_flags);
 127         if (retval) {
 128                 com_err("ext2fs_check_if_mount", retval,
 129                         _("while determining whether %s is mounted."),
 130                         device);
 131                 return;
 132         }
 133         if (mount_flags & EXT2_MF_MOUNTED) {
 134                 fprintf(stderr, _("%s is mounted; "), device);
 135                 if (force >= 2) {
 136                         fputs(_("mke2fs forced anyway.  Hope /etc/mtab is "
 137                                 "incorrect.\n"), stderr);
 138                         return;
 139                 }
 140         abort_mke2fs:
 141                 fprintf(stderr, _("will not make a %s here!\n"), type);
 142                 exit(1);
 143         }
 144         if (mount_flags & EXT2_MF_BUSY) {
 145                 fprintf(stderr, _("%s is apparently in use by the system; "),
 146                         device);
 147                 if (force >= 2) {
 148                         fputs(_("mke2fs forced anyway.\n"), stderr);
 149                         return;
 150                 }
 151                 goto abort_mke2fs;
 152         }
 153 }
 154
 155 void parse_journal_opts(const char *opts)
 156 {
 157         char    *buf, *token, *next, *p, *arg;
 158         int     len;
 159         int     journal_usage = 0;
 160
 161         len = strlen(opts);
 162         buf = malloc(len+1);
 163         if (!buf) {
 164                 fputs(_("Couldn't allocate memory to parse journal "
 165                         "options!\n"), stderr);
 166                 exit(1);
 167         }
 168         strcpy(buf, opts);
 169         for (token = buf; token && *token; token = next) {
 170                 p = strchr(token, ',');
 171                 next = 0;
 172                 if (p) {
 173                         *p = 0;
 174                         next = p+1;
 175                 }
 176                 arg = strchr(token, '=');
 177                 if (arg) {
 178                         *arg = 0;
 179                         arg++;
 180                 }
 181 #if 0
 182                 printf("Journal option=%s, argument=%s\n", token,
 183                        arg ? arg : "NONE");
 184 #endif
 185                 if (strcmp(token, "device") == 0) {
 186                         journal_device = blkid_get_devname(NULL, arg, NULL);
 187                         if (!journal_device) {
 188                                 if (arg)
 189                                         fprintf(stderr, _("\nCould not find "
 190                                                 "journal device matching %s\n"),
 191                                                 arg);
 192                                 journal_usage++;
 193                                 continue;
 194                         }
 195                 } else if (strcmp(token, "size") == 0) {
 196                         if (!arg) {
 197                                 journal_usage++;
 198                                 continue;
 199                         }
 200                         journal_size = strtoul(arg, &p, 0);
 201                         if (*p)
 202                                 journal_usage++;
 203                 } else if (!strcmp(token, "location")) {
 204                         if (!arg) {
 205                                 journal_usage++;
 206                                 continue;
 207                         }
 208                         journal_location_string = strdup(arg);
 209                 } else if (strcmp(token, "v1_superblock") == 0) {
 210                         journal_flags |= EXT2_MKJOURNAL_V1_SUPER;
 211                         continue;
 212                 } else
 213                         journal_usage++;
 214         }
 215         if (journal_usage) {
 216                 fputs(_("\nBad journal options specified.\n\n"
 217                         "Journal options are separated by commas, "
 218                         "and may take an argument which\n"
 219                         "\tis set off by an equals ('=') sign.\n\n"
 220                         "Valid journal options are:\n"
 221                         "\tsize=<journal size in megabytes>\n"
 222                         "\tdevice=<journal device>\n"
 223                         "\tlocation=<journal location>\n\n"
 224                         "The journal size must be between "
 225                         "1024 and 10240000 filesystem blocks.\n\n"), stderr);
 226                 free(buf);
 227                 exit(1);
 228         }
 229         free(buf);
 230 }
 231
 232 /*
 233  * Determine the number of journal blocks to use, either via
 234  * user-specified # of megabytes, or via some intelligently selected
 235  * defaults.
 236  *
 237  * Find a reasonable journal file size (in blocks) given the number of blocks
 238  * in the filesystem.  For very small filesystems, it is not reasonable to
 239  * have a journal that fills more than half of the filesystem.
 240  */
 241 unsigned int figure_journal_size(int size, ext2_filsys fs)
 242 {
 243         int j_blocks;
 244
 245         j_blocks = ext2fs_default_journal_size(ext2fs_blocks_count(fs->super));
 246         if (j_blocks < 0) {
 247                 fputs(_("\nFilesystem too small for a journal\n"), stderr);
 248                 return 0;
 249         }
 250
 251         if (size > 0) {
 252                 j_blocks = size * 1024 / (fs->blocksize / 1024);
 253                 if (j_blocks < 1024 || j_blocks > 10240000) {
 254                         fprintf(stderr, _("\nThe requested journal "
 255                                 "size is %d blocks; it must be\n"
 256                                 "between 1024 and 10240000 blocks.  "
 257                                 "Aborting.\n"),
 258                                 j_blocks);
 259                         exit(1);
 260                 }
 261                 if ((unsigned) j_blocks > ext2fs_free_blocks_count(fs->super) / 2) {
 262                         fputs(_("\nJournal size too big for filesystem.\n"),
 263                               stderr);
 264                         exit(1);
 265                 }
 266         }
 267         return j_blocks;
 268 }
 269
 270 void print_check_message(int mnt, unsigned int check)
 271 {
 272         if (mnt < 0)
 273                 mnt = 0;
 274         if (!mnt && !check)
 275                 return;
 276         printf(_("This filesystem will be automatically "
 277                  "checked every %d mounts or\n"
 278                  "%g days, whichever comes first.  "
 279                  "Use tune2fs -c or -i to override.\n"),
 280                mnt, ((double) check) / (3600 * 24));
 281 }
 282
 283 void dump_mmp_msg(struct mmp_struct *mmp, const char *msg)
 284 {
 285
 286         if (msg)
 287                 printf("MMP check failed: %s\n", msg);
 288         if (mmp) {
 289                 time_t t = mmp->mmp_time;
 290
 291                 printf("MMP error info: last update: %s node: %s device: %s\n",
 292                        ctime(&t), mmp->mmp_nodename, mmp->mmp_bdevname);
 293         }
 294 }