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