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Sourcecode: e2fsprogs version File versions

util.c

/*
 * util.c --- helper functions used by tune2fs and mke2fs
 * 
 * Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

#define _LARGEFILE_SOURCE
#define _LARGEFILE64_SOURCE

#include <stdio.h>
#include <string.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_LINUX_MAJOR_H
#include <linux/major.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif

#include "et/com_err.h"
#include "e2p/e2p.h"
#include "ext2fs/ext2_fs.h"
#include "ext2fs/ext2fs.h"
#include "nls-enable.h"
#include "blkid/blkid.h"
#include "util.h"

#ifndef HAVE_STRCASECMP
int strcasecmp (char *s1, char *s2)
{
      while (*s1 && *s2) {
            int ch1 = *s1++, ch2 = *s2++;
            if (isupper (ch1))
                  ch1 = tolower (ch1);
            if (isupper (ch2))
                  ch2 = tolower (ch2);
            if (ch1 != ch2)
                  return ch1 - ch2;
      }
      return *s1 ? 1 : *s2 ? -1 : 0;
}
#endif

/*
 * Given argv[0], return the program name.
 */
char *get_progname(char *argv_zero)
{
      char  *cp;

      cp = strrchr(argv_zero, '/');
      if (!cp )
            return argv_zero;
      else
            return cp+1;
}

void proceed_question(void)
{
      char buf[256];
      const char *short_yes = _("yY");

      fflush(stdout);
      fflush(stderr);
      fputs(_("Proceed anyway? (y,n) "), stdout);
      buf[0] = 0;
      fgets(buf, sizeof(buf), stdin);
      if (strchr(short_yes, buf[0]) == 0)
            exit(1);
}

void check_plausibility(const char *device)
{
      int val;
#ifdef HAVE_OPEN64
      struct stat64 s;
      
      val = stat64(device, &s);
#else
      struct stat s;
      
      val = stat(device, &s);
#endif
      
      if(val == -1) {
            fprintf(stderr, _("Could not stat %s --- %s\n"),
                  device, error_message(errno));
            if (errno == ENOENT)
                  fputs(_("\nThe device apparently does not exist; "
                        "did you specify it correctly?\n"), stderr);
            exit(1);
      }
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
      /* On FreeBSD, all disk devices are character specials */
      if (!S_ISBLK(s.st_mode) && !S_ISCHR(s.st_mode))
#else
      if (!S_ISBLK(s.st_mode))
#endif
      {
            printf(_("%s is not a block special device.\n"), device);
            proceed_question();
            return;
      }

#ifdef HAVE_LINUX_MAJOR_H
#ifndef MAJOR
#define MAJOR(dev)      ((dev)>>8)
#define MINOR(dev)      ((dev) & 0xff)
#endif
#ifndef SCSI_BLK_MAJOR
#ifdef SCSI_DISK0_MAJOR
#ifdef SCSI_DISK8_MAJOR
#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
  ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR) || \
  ((M) >= SCSI_DISK8_MAJOR && (M) <= SCSI_DISK15_MAJOR))
#else
#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
  ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR))
#endif /* defined(SCSI_DISK8_MAJOR) */
#define SCSI_BLK_MAJOR(M) (SCSI_DISK_MAJOR((M)) || (M) == SCSI_CDROM_MAJOR)
#else
#define SCSI_BLK_MAJOR(M)  ((M) == SCSI_DISK_MAJOR || (M) == SCSI_CDROM_MAJOR)
#endif /* defined(SCSI_DISK0_MAJOR) */
#endif /* defined(SCSI_BLK_MAJOR) */
      if (((MAJOR(s.st_rdev) == HD_MAJOR &&
            MINOR(s.st_rdev)%64 == 0) ||
           (SCSI_BLK_MAJOR(MAJOR(s.st_rdev)) &&
            MINOR(s.st_rdev)%16 == 0))) {
            printf(_("%s is entire device, not just one partition!\n"),
                   device);
            proceed_question();
      }
#endif
}

void check_mount(const char *device, int force, const char *type)
{
      errcode_t   retval;
      int         mount_flags;

      retval = ext2fs_check_if_mounted(device, &mount_flags);
      if (retval) {
            com_err("ext2fs_check_if_mount", retval,
                  _("while determining whether %s is mounted."),
                  device);
            return;
      }
      if (!(mount_flags & EXT2_MF_MOUNTED))
            return;

      fprintf(stderr, _("%s is mounted; "), device);
      if (force) {
            fputs(_("mke2fs forced anyway.  Hope /etc/mtab is "
                  "incorrect.\n"), stderr);
      } else {
            fprintf(stderr, _("will not make a %s here!\n"), type);
            exit(1);
      }
}

void parse_journal_opts(const char *opts)
{
      char  *buf, *token, *next, *p, *arg;
      int   len;
      int   journal_usage = 0;

      len = strlen(opts);
      buf = malloc(len+1);
      if (!buf) {
            fputs(_("Couldn't allocate memory to parse journal "
                  "options!\n"), stderr);
            exit(1);
      }
      strcpy(buf, opts);
      for (token = buf; token && *token; token = next) {
            p = strchr(token, ',');
            next = 0;
            if (p) {
                  *p = 0;
                  next = p+1;
            } 
            arg = strchr(token, '=');
            if (arg) {
                  *arg = 0;
                  arg++;
            }
#if 0
            printf("Journal option=%s, argument=%s\n", token,
                   arg ? arg : "NONE");
#endif
            if (strcmp(token, "device") == 0) {
                  journal_device = blkid_get_devname(NULL, arg, NULL);
                  if (!journal_device) {
                        journal_usage++;
                        continue;
                  }
            } else if (strcmp(token, "size") == 0) {
                  if (!arg) {
                        journal_usage++;
                        continue;
                  }
                  journal_size = strtoul(arg, &p, 0);
                  if (*p)
                        journal_usage++;
            } else if (strcmp(token, "v1_superblock") == 0) {
                  journal_flags |= EXT2_MKJOURNAL_V1_SUPER;
                  continue;
            } else
                  journal_usage++;
      }
      if (journal_usage) {
            fputs(_("\nBad journal options specified.\n\n"
                  "Journal options are separated by commas, "
                  "and may take an argument which\n"
                  "\tis set off by an equals ('=') sign.\n\n"
                  "Valid journal options are:\n"
                  "\tsize=<journal size in megabytes>\n"
                  "\tdevice=<journal device>\n\n"
                  "The journal size must be between "
                  "1024 and 102400 filesystem blocks.\n\n"), stderr);
            exit(1);
      }
}     

/*
 * Determine the number of journal blocks to use, either via
 * user-specified # of megabytes, or via some intelligently selected
 * defaults.
 * 
 * Find a reasonable journal file size (in blocks) given the number of blocks
 * in the filesystem.  For very small filesystems, it is not reasonable to
 * have a journal that fills more than half of the filesystem.
 */
int figure_journal_size(int size, ext2_filsys fs)
{
      blk_t j_blocks;

      if (fs->super->s_blocks_count < 2048) {
            fputs(_("\nFilesystem too small for a journal\n"), stderr);
            return 0;
      }
      
      if (size >= 0) {
            j_blocks = size * 1024 / (fs->blocksize   / 1024);
            if (j_blocks < 1024 || j_blocks > 102400) {
                  fprintf(stderr, _("\nThe requested journal "
                        "size is %d blocks; it must be\n"
                        "between 1024 and 102400 blocks.  "
                        "Aborting.\n"),
                        j_blocks);
                  exit(1);
            }
            if (j_blocks > fs->super->s_free_blocks_count) {
                  fputs(_("\nJournal size too big for filesystem.\n"),
                        stderr);
                  exit(1);
            }
            return j_blocks;
      }

      if (fs->super->s_blocks_count < 32768)
            j_blocks = 1024;
      else if (fs->super->s_blocks_count < 262144)
            j_blocks = 4096;
      else
            j_blocks = 8192;

      return j_blocks;
}

void print_check_message(ext2_filsys fs)
{
      printf(_("This filesystem will be automatically "
             "checked every %d mounts or\n"
             "%g days, whichever comes first.  "
             "Use tune2fs -c or -i to override.\n"),
             fs->super->s_max_mnt_count,
             (double)fs->super->s_checkinterval / (3600 * 24));
}

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