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xpeek.c

/*
 *   Copyright (c) International Business Machines Corp., 2000-2002
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
/*
 *   FUNCTION: Display and Alter structures in an unmounted filesystem
 */
#include <config.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "xpeek.h"
#include "jfs_endian.h"
#include "jfs_logmgr.h"
#include "jfs_version.h"
#include "devices.h"
#include "inode.h"
#include "super.h"

extern void superblock2(void);

/* endian routines */
unsigned type_jfs;

/* Global Data */
int bsize;              /* aggregate block size         */
FILE *fp;                     /* Used by libfs routines       */
short l2bsize;                /* log2 of aggregate block size */
int64_t AIT_2nd_offset;       /* Used by find_iag routines    */
int64_t fsckwsp_offset;       /* Used by fsckcbbl routines    */
int64_t jlog_super_offset;    /* Used by fsckcbbl routines    */

void usage(void);

void usage()
{
      fputs("Usage: jfs_debugfs <block device>\n", stderr);
}

int main(int argc, char **argv)
{
      int cmd_len;
      char *command;
      char command_line[512];
      char *device;
      struct superblock sb;

      printf("jfs_debugfs version %s, %s\n", VERSION, JFSUTILS_DATE);

      /* Put the console into UTF8 mode. */
      printf("\33%s", "%G");

      /* Check arguments */
      if (argc != 2) {
            usage();
            exit(1);
      }
      device = argv[1];

      /* Open device */
      fp = fopen(device, "r+");
      if (fp == NULL) {
            fprintf(stderr, "Error: Cannot open device %s.\n", device);
            exit(1);
      }

      /* Get block size information from the superblock       */
      if (ujfs_get_superblk(fp, &sb, 1)) {
            fputs("jfs_debugfs: error reading primary superblock\n", stderr);
            if (ujfs_get_superblk(fp, &sb, 0)) {
                  fputs("jfs_debugfs: error reading secondary superblock\n", stderr);
                  goto errorout;
            } else
                  fputs("jfs_debugfs: using secondary superblock\n", stderr);
      }

      type_jfs = sb.s_flag;

      bsize = sb.s_bsize;
      l2bsize = sb.s_l2bsize;
      AIT_2nd_offset = addressPXD(&(sb.s_ait2)) * bsize;
      fsckwsp_offset = addressPXD(&(sb.s_fsckpxd)) << l2bsize;
      jlog_super_offset = (addressPXD(&(sb.s_logpxd)) << l2bsize)
          + LOGPSIZE;

      printf("\nAggregate Block Size: %d\n\n", bsize);

      /* Main Loop */

      fputs("> ", stdout);
      fflush(stdout);
      while (fgets(command_line, 512, stdin)) {
            command = strtok(command_line, " \t\n");  /* space or tab */
            if (command && *command) {
                  cmd_len = strlen(command);
                  if (strncmp(command, "alter", cmd_len) == 0)
                        alter();
                  else if (strncmp(command, "btree", cmd_len) == 0) {
                        fputs("btree command is not yet implemented.\n", stderr);
                  } else if (cmd_len > 1 && strncmp(command, "cbblfsck", cmd_len) == 0)
                        cbblfsck();
                  else if (cmd_len > 2 && strncmp(command, "directory", cmd_len) == 0)
                        directory();
                  else if (cmd_len > 1 && strncmp(command, "dmap", cmd_len) == 0)
                        dmap();
                  else if (cmd_len > 1 && strncmp(command, "dtree", cmd_len) == 0)
                        dtree();
                  else if (cmd_len > 1 && strncmp(command, "xtree", cmd_len) == 0)
                        xtree();
                  else if (strncmp(command, "display", cmd_len) == 0)
                        display();
                  else if (cmd_len > 4 && strncmp(command, "fsckwsphdr", cmd_len) == 0)
                        fsckwsphdr();
                  else if (strncmp(command, "help", cmd_len) == 0)
                        help();
                  else if (cmd_len > 1 && strncmp(command, "iag", cmd_len) == 0)
                        iag();
                  else if (strncmp(command, "inode", cmd_len) == 0)
                        inode();
                  else if (cmd_len > 3 && strncmp(command, "logsuper", cmd_len) == 0)
                        logsuper();
                  else if (strncmp(command, "quit", cmd_len) == 0)
                        break;
                  else if ((cmd_len > 1) && strncmp(command, "set", cmd_len) == 0) {
                        fputs("set command is not yet implemented.\n", stderr);
                  } else if ((cmd_len > 1) && strncmp(command, "superblock", cmd_len) == 0)
                        superblock();
                  else if (cmd_len > 2 && strncmp(command, "s2perblock", cmd_len) == 0)
                        superblock2();
                  else if (strncmp(command, "unset", cmd_len) == 0) {
                        fputs("unset command is not yet implemented.\n", stderr);
                  } else
                        fprintf(stderr, "Invalid command: %s\n", command);
            }
            fputs("> ", stdout);
            fflush(stdout);
      }
      errorout:
      ujfs_flush_dev(fp);
      fclose(fp);
      return 0;
}

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