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 #define _LARGEFILE_SOURCE
  13 #define _LARGEFILE64_SOURCE
  14
  15 #include "config.h"
  16 #include <stdio.h>
  17 #include <string.h>
  18 #ifdef HAVE_ERRNO_H
  19 #include <errno.h>
  20 #endif
  21 #ifdef HAVE_LINUX_MAJOR_H
  22 #include <linux/major.h>
  23 #endif
  24 #ifdef HAVE_SYS_STAT_H
  25 #include <sys/stat.h>
  26 #endif
  27 #include <time.h>
  28
  29 #include "et/com_err.h"
  30 #include "e2p/e2p.h"
  31 #include "ext2fs/ext2_fs.h"
  32 #include "ext2fs/ext2fs.h"
  33 #include "nls-enable.h"
  34 #include "blkid/blkid.h"
  35 #include "util.h"
  36
  37 #ifndef HAVE_STRCASECMP
  38 int strcasecmp (char *s1, char *s2)
  39 {
  40         while (*s1 && *s2) {
  41                 int ch1 = *s1++, ch2 = *s2++;
  42                 if (isupper (ch1))
  43                         ch1 = tolower (ch1);
  44                 if (isupper (ch2))
  45                         ch2 = tolower (ch2);
  46                 if (ch1 != ch2)
  47                         return ch1 - ch2;
  48         }
  49         return *s1 ? 1 : *s2 ? -1 : 0;
  50 }
  51 #endif
  52
  53 /*
  54  * Given argv[0], return the program name.
  55  */
  56 char *get_progname(char *argv_zero)
  57 {
  58         char    *cp;
  59
  60         cp = strrchr(argv_zero, '/');
  61         if (!cp )
  62                 return argv_zero;
  63         else
  64                 return cp+1;
  65 }
  66
  67 void proceed_question(void)
  68 {
  69         char buf[256];
  70         const char *short_yes = _("yY");
  71
  72         fflush(stdout);
  73         fflush(stderr);
  74         fputs(_("Proceed anyway? (y,n) "), stdout);
  75         buf[0] = 0;
  76         if (!fgets(buf, sizeof(buf), stdin) ||
  77             strchr(short_yes, buf[0]) == 0)
  78                 exit(1);
  79 }
  80
  81 void check_plausibility(const char *device)
  82 {
  83         int val;
  84         ext2fs_struct_stat s;
  85
  86         val = ext2fs_stat(device, &s);
  87
  88         if(val == -1) {
  89                 fprintf(stderr, _("Could not stat %s --- %s\n"),
  90                         device, error_message(errno));
  91                 if (errno == ENOENT)
  92                         fputs(_("\nThe device apparently does not exist; "
  93                                 "did you specify it correctly?\n"), stderr);
  94                 exit(1);
  95         }
  96 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
  97         /* On FreeBSD, all disk devices are character specials */
  98         if (!S_ISBLK(s.st_mode) && !S_ISCHR(s.st_mode))
  99 #else
 100         if (!S_ISBLK(s.st_mode))
 101 #endif
 102         {
 103                 printf(_("%s is not a block special device.\n"), device);
 104                 proceed_question();
 105                 return;
 106         }
 107
 108 #ifdef HAVE_LINUX_MAJOR_H
 109 #ifndef MAJOR
 110 #define MAJOR(dev)      ((dev)>>8)
 111 #define MINOR(dev)      ((dev) & 0xff)
 112 #endif
 113 #ifndef SCSI_BLK_MAJOR
 114 #ifdef SCSI_DISK0_MAJOR
 115 #ifdef SCSI_DISK8_MAJOR
 116 #define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
 117   ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR) || \
 118   ((M) >= SCSI_DISK8_MAJOR && (M) <= SCSI_DISK15_MAJOR))
 119 #else
 120 #define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
 121   ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR))
 122 #endif /* defined(SCSI_DISK8_MAJOR) */
 123 #define SCSI_BLK_MAJOR(M) (SCSI_DISK_MAJOR((M)) || (M) == SCSI_CDROM_MAJOR)
 124 #else
 125 #define SCSI_BLK_MAJOR(M)  ((M) == SCSI_DISK_MAJOR || (M) == SCSI_CDROM_MAJOR)
 126 #endif /* defined(SCSI_DISK0_MAJOR) */
 127 #endif /* defined(SCSI_BLK_MAJOR) */
 128         if (((MAJOR(s.st_rdev) == HD_MAJOR &&
 129               MINOR(s.st_rdev)%64 == 0) ||
 130              (SCSI_BLK_MAJOR(MAJOR(s.st_rdev)) &&
 131               MINOR(s.st_rdev)%16 == 0))) {
 132                 printf(_("%s is entire device, not just one partition!\n"),
 133                        device);
 134                 proceed_question();
 135         }
 136 #endif
 137 }
 138
 139 void check_mount(const char *device, int force, const char *type)
 140 {
 141         errcode_t       retval;
 142         int             mount_flags;
 143
 144         retval = ext2fs_check_if_mounted(device, &mount_flags);
 145         if (retval) {
 146                 com_err("ext2fs_check_if_mount", retval,
 147                         _("while determining whether %s is mounted."),
 148                         device);
 149                 return;
 150         }
 151         if (mount_flags & EXT2_MF_MOUNTED) {
 152                 fprintf(stderr, _("%s is mounted; "), device);
 153                 if (force > 2) {
 154                         fputs(_("mke2fs forced anyway.  Hope /etc/mtab is "
 155                                 "incorrect.\n"), stderr);
 156                         return;
 157                 }
 158         abort_mke2fs:
 159                 fprintf(stderr, _("will not make a %s here!\n"), type);
 160                 exit(1);
 161         }
 162         if (mount_flags & EXT2_MF_BUSY) {
 163                 fprintf(stderr, _("%s is apparently in use by the system; "),
 164                         device);
 165                 if (force > 2) {
 166                         fputs(_("mke2fs forced anyway.\n"), stderr);
 167                         return;
 168                 }
 169                 goto abort_mke2fs;
 170         }
 171 }
 172
 173 void parse_journal_opts(const char *opts)
 174 {
 175         char    *buf, *token, *next, *p, *arg;
 176         int     len;
 177         int     journal_usage = 0;
 178
 179         len = strlen(opts);
 180         buf = malloc(len+1);
 181         if (!buf) {
 182                 fputs(_("Couldn't allocate memory to parse journal "
 183                         "options!\n"), stderr);
 184                 exit(1);
 185         }
 186         strcpy(buf, opts);
 187         for (token = buf; token && *token; token = next) {
 188                 p = strchr(token, ',');
 189                 next = 0;
 190                 if (p) {
 191                         *p = 0;
 192                         next = p+1;
 193                 }
 194                 arg = strchr(token, '=');
 195                 if (arg) {
 196                         *arg = 0;
 197                         arg++;
 198                 }
 199 #if 0
 200                 printf("Journal option=%s, argument=%s\n", token,
 201                        arg ? arg : "NONE");
 202 #endif
 203                 if (strcmp(token, "device") == 0) {
 204                         journal_device = blkid_get_devname(NULL, arg, NULL);
 205                         if (!journal_device) {
 206                                 if (arg)
 207                                         fprintf(stderr, _("\nCould not find "
 208                                                 "journal device matching %s\n"),
 209                                                 arg);
 210                                 journal_usage++;
 211                                 continue;
 212                         }
 213                 } else if (strcmp(token, "size") == 0) {
 214                         if (!arg) {
 215                                 journal_usage++;
 216                                 continue;
 217                         }
 218                         journal_size = strtoul(arg, &p, 0);
 219                         if (*p)
 220                                 journal_usage++;
 221                 } else if (strcmp(token, "v1_superblock") == 0) {
 222                         journal_flags |= EXT2_MKJOURNAL_V1_SUPER;
 223                         continue;
 224                 } else
 225                         journal_usage++;
 226         }
 227         if (journal_usage) {
 228                 fputs(_("\nBad journal options specified.\n\n"
 229                         "Journal options are separated by commas, "
 230                         "and may take an argument which\n"
 231                         "\tis set off by an equals ('=') sign.\n\n"
 232                         "Valid journal options are:\n"
 233                         "\tsize=<journal size in megabytes>\n"
 234                         "\tdevice=<journal device>\n\n"
 235                         "The journal size must be between "
 236                         "1024 and 10240000 filesystem blocks.\n\n"), stderr);
 237                 free(buf);
 238                 exit(1);
 239         }
 240         free(buf);
 241 }
 242
 243 /*
 244  * Determine the number of journal blocks to use, either via
 245  * user-specified # of megabytes, or via some intelligently selected
 246  * defaults.
 247  *
 248  * Find a reasonable journal file size (in blocks) given the number of blocks
 249  * in the filesystem.  For very small filesystems, it is not reasonable to
 250  * have a journal that fills more than half of the filesystem.
 251  */
 252 unsigned int figure_journal_size(int size, ext2_filsys fs)
 253 {
 254         int j_blocks;
 255
 256         j_blocks = ext2fs_default_journal_size(ext2fs_blocks_count(fs->super));
 257         if (j_blocks < 0) {
 258                 fputs(_("\nFilesystem too small for a journal\n"), stderr);
 259                 return 0;
 260         }
 261
 262         if (size > 0) {
 263                 j_blocks = size * 1024 / (fs->blocksize / 1024);
 264                 if (j_blocks < 1024 || j_blocks > 10240000) {
 265                         fprintf(stderr, _("\nThe requested journal "
 266                                 "size is %d blocks; it must be\n"
 267                                 "between 1024 and 10240000 blocks.  "
 268                                 "Aborting.\n"),
 269                                 j_blocks);
 270                         exit(1);
 271                 }
 272                 if ((unsigned) j_blocks > ext2fs_free_blocks_count(fs->super) / 2) {
 273                         fputs(_("\nJournal size too big for filesystem.\n"),
 274                               stderr);
 275                         exit(1);
 276                 }
 277         }
 278         return j_blocks;
 279 }
 280
 281 void print_check_message(int mnt, unsigned int check)
 282 {
 283         if (mnt < 0)
 284                 mnt = 0;
 285         if (!mnt && !check)
 286                 return;
 287         printf(_("This filesystem will be automatically "
 288                  "checked every %d mounts or\n"
 289                  "%g days, whichever comes first.  "
 290                  "Use tune2fs -c or -i to override.\n"),
 291                mnt, ((double) check) / (3600 * 24));
 292 }
 293
 294 void dump_mmp_msg(struct mmp_struct *mmp, const char *msg)
 295 {
 296
 297         if (msg)
 298                 printf("MMP check failed: %s\n", msg);
 299         if (mmp) {
 300                 time_t t = mmp->mmp_time;
 301
 302                 printf("MMP error info: last update: %s node: %s device: %s\n",
 303                        ctime(&t), mmp->mmp_nodename, mmp->mmp_bdevname);
 304         }
 305 }