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dumpe2fs.c

/*
 * dumpe2fs.c           - List the control structures of a second
 *                  extended filesystem
 *
 * Copyright (C) 1992, 1993, 1994  Remy Card <card@masi.ibp.fr>
 *                                 Laboratoire MASI, Institut Blaise Pascal
 *                                 Universite Pierre et Marie Curie (Paris VI)
 *
 * Copyright 1995, 1996, 1997 by Theodore Ts'o.
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

/*
 * History:
 * 94/01/09 - Creation
 * 94/02/27 - Ported to use the ext2fs library
 */

#ifdef HAVE_GETOPT_H
#include <getopt.h>
#else
extern char *optarg;
extern int optind;
#endif
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "ext2fs/ext2_fs.h"

#include "ext2fs/ext2fs.h"
#include "e2p/e2p.h"
#include "jfs_user.h"
#include <uuid/uuid.h>

#include "../version.h"
#include "nls-enable.h"

#define in_use(m, x)    (ext2fs_test_bit ((x), (m)))

const char * program_name = "dumpe2fs";
char * device_name = NULL;
int hex_format = 0;

static void usage(void)
{
      fprintf (stderr, _("Usage: %s [-bfhixV] [-ob superblock] "
             "[-oB blocksize] device\n"), program_name);
      exit (1);
}

static void print_number(unsigned long num)
{
      if (hex_format) 
            printf("0x%04lx", num);
      else
            printf("%lu", num);
}

static void print_range(unsigned long a, unsigned long b)
{
      if (hex_format) 
            printf("0x%04lx-0x%04lx", a, b);
      else
            printf("%lu-%lu", a, b);
}

static void print_free (unsigned long group, char * bitmap,
                  unsigned long nbytes, unsigned long offset)
{
      int p = 0;
      unsigned long i;
      unsigned long j;

      offset += group * nbytes;
      for (i = 0; i < nbytes; i++)
            if (!in_use (bitmap, i))
            {
                  if (p)
                        printf (", ");
                  print_number(i + offset);
                  for (j = i; j < nbytes && !in_use (bitmap, j); j++)
                        ;
                  if (--j != i) {
                        fputc('-', stdout);
                        print_number(j + offset);
                        i = j;
                  }
                  p = 1;
            }
}

static void print_bg_opt(int bg_flags, int mask,
                    const char *str, int *first)
{
      if (bg_flags & mask) {
            if (*first) {
                  fputs(" [", stdout);
                  *first = 0;
            } else
                  fputs(", ", stdout);
            fputs(str, stdout);
      }
}
static void print_bg_opts(ext2_filsys fs, dgrp_t i)
{
      int first = 1, bg_flags;

      if (fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_LAZY_BG)
            bg_flags = fs->group_desc[i].bg_flags;
      else
            bg_flags = 0;

      print_bg_opt(bg_flags, EXT2_BG_INODE_UNINIT, "Inode not init",
                 &first);
      print_bg_opt(bg_flags, EXT2_BG_BLOCK_UNINIT, "Block not init",
                 &first);
      if (!first)
            fputc(']', stdout);
      fputc('\n', stdout);
}

static void list_desc (ext2_filsys fs)
{
      unsigned long i;
      long diff;
      blk_t first_block, last_block;
      blk_t super_blk, old_desc_blk, new_desc_blk;
      char *block_bitmap=NULL, *inode_bitmap=NULL;
      int inode_blocks_per_group, old_desc_blocks, reserved_gdt;
      int has_super;

      if (fs->block_map)
            block_bitmap = fs->block_map->bitmap;
      if (fs->inode_map)
            inode_bitmap = fs->inode_map->bitmap;

      inode_blocks_per_group = ((fs->super->s_inodes_per_group *
                           EXT2_INODE_SIZE(fs->super)) +
                          EXT2_BLOCK_SIZE(fs->super) - 1) /
                         EXT2_BLOCK_SIZE(fs->super);
      reserved_gdt = fs->super->s_reserved_gdt_blocks;
      fputc('\n', stdout);
      first_block = fs->super->s_first_data_block;
      if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
            old_desc_blocks = fs->super->s_first_meta_bg;
      else
            old_desc_blocks = fs->desc_blocks;
      for (i = 0; i < fs->group_desc_count; i++) {
            first_block = ext2fs_group_first_block(fs, i);
            last_block = ext2fs_group_last_block(fs, i);

            ext2fs_super_and_bgd_loc(fs, i, &super_blk, 
                               &old_desc_blk, &new_desc_blk, 0);

            printf (_("Group %lu: (Blocks "), i);
            print_range(first_block, last_block);
            fputs(")", stdout);
            print_bg_opts(fs, i);
            has_super = ((i==0) || super_blk);
            if (has_super) {
                  printf (_("  %s superblock at "),
                        i == 0 ? _("Primary") : _("Backup"));
                  print_number(super_blk);
            }
            if (old_desc_blk) {
                  printf(_(", Group descriptors at "));
                  print_range(old_desc_blk, 
                            old_desc_blk + old_desc_blocks - 1);
                  if (reserved_gdt) {
                        printf(_("\n  Reserved GDT blocks at "));
                        print_range(old_desc_blk + old_desc_blocks,
                                  old_desc_blk + old_desc_blocks + 
                                  reserved_gdt - 1);
                  }
            } else if (new_desc_blk) {
                  fputc(has_super ? ',' : ' ', stdout);
                  printf(_(" Group descriptor at "));
                  print_number(new_desc_blk);
                  has_super++;
            }
            if (has_super)
                  fputc('\n', stdout);
            fputs(_("  Block bitmap at "), stdout);
            print_number(fs->group_desc[i].bg_block_bitmap);
            diff = fs->group_desc[i].bg_block_bitmap - first_block;
            if (diff >= 0)
                  printf(" (+%ld)", diff);
            fputs(_(", Inode bitmap at "), stdout);
            print_number(fs->group_desc[i].bg_inode_bitmap);
            diff = fs->group_desc[i].bg_inode_bitmap - first_block;
            if (diff >= 0)
                  printf(" (+%ld)", diff);
            fputs(_("\n  Inode table at "), stdout);
            print_range(fs->group_desc[i].bg_inode_table,
                      fs->group_desc[i].bg_inode_table +
                      inode_blocks_per_group - 1);
            diff = fs->group_desc[i].bg_inode_table - first_block;
            if (diff > 0)
                  printf(" (+%ld)", diff);
            printf (_("\n  %d free blocks, %d free inodes, "
                    "%d directories\n"),
                  fs->group_desc[i].bg_free_blocks_count,
                  fs->group_desc[i].bg_free_inodes_count,
                  fs->group_desc[i].bg_used_dirs_count);
            if (block_bitmap) {
                  fputs(_("  Free blocks: "), stdout);
                  print_free (i, block_bitmap,
                            fs->super->s_blocks_per_group,
                            fs->super->s_first_data_block);
                  fputc('\n', stdout);
                  block_bitmap += fs->super->s_blocks_per_group / 8;
            }
            if (inode_bitmap) {
                  fputs(_("  Free inodes: "), stdout);
                  print_free (i, inode_bitmap,
                            fs->super->s_inodes_per_group, 1);
                  fputc('\n', stdout);
                  inode_bitmap += fs->super->s_inodes_per_group / 8;
            }
      }
}

static void list_bad_blocks(ext2_filsys fs, int dump)
{
      badblocks_list          bb_list = 0;
      badblocks_iterate bb_iter;
      blk_t             blk;
      errcode_t         retval;
      const char        *header, *fmt;

      retval = ext2fs_read_bb_inode(fs, &bb_list);
      if (retval) {
            com_err("ext2fs_read_bb_inode", retval, 0);
            return;
      }
      retval = ext2fs_badblocks_list_iterate_begin(bb_list, &bb_iter);
      if (retval) {
            com_err("ext2fs_badblocks_list_iterate_begin", retval,
                  _("while printing bad block list"));
            return;
      }
      if (dump) {
            header = fmt = "%u\n";
      } else {
            header =  _("Bad blocks: %u");
            fmt = ", %u";
      }
      while (ext2fs_badblocks_list_iterate(bb_iter, &blk)) {
            printf(header ? header : fmt, blk);
            header = 0;
      }
      ext2fs_badblocks_list_iterate_end(bb_iter);
      if (!dump)
            fputc('\n', stdout);
}

static void print_inline_journal_information(ext2_filsys fs)
{
      struct ext2_inode inode;
      errcode_t         retval;
      ino_t             ino = fs->super->s_journal_inum;
      int               size;
      
      retval = ext2fs_read_inode(fs, ino,  &inode);
      if (retval) {
            com_err(program_name, retval,
                  _("while reading journal inode"));
            exit(1);
      }
      fputs(_("Journal size:             "), stdout);
      size = inode.i_blocks >> 1;
      if (size < 8192)
            printf("%uk\n", size);
      else
            printf("%uM\n", size >> 10);
}

static void print_journal_information(ext2_filsys fs)
{
      errcode_t   retval;
      char        buf[1024];
      char        str[80];
      unsigned int      i;
      journal_superblock_t    *jsb;

      /* Get the journal superblock */
      if ((retval = io_channel_read_blk(fs->io, fs->super->s_first_data_block+1, -1024, buf))) {
            com_err(program_name, retval,
                  _("while reading journal superblock"));
            exit(1);
      }
      jsb = (journal_superblock_t *) buf;
      if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
          (jsb->s_header.h_blocktype !=
           (unsigned) ntohl(JFS_SUPERBLOCK_V2))) {
            com_err(program_name, 0,
                  _("Couldn't find journal superblock magic numbers"));
            exit(1);
      }

      printf(_("\nJournal block size:       %u\n"
             "Journal length:           %u\n"
             "Journal first block:      %u\n"
             "Journal sequence:         0x%08x\n"
             "Journal start:            %u\n"
             "Journal number of users:  %u\n"),
             (unsigned int)ntohl(jsb->s_blocksize),  (unsigned int)ntohl(jsb->s_maxlen),
             (unsigned int)ntohl(jsb->s_first), (unsigned int)ntohl(jsb->s_sequence),
             (unsigned int)ntohl(jsb->s_start), (unsigned int)ntohl(jsb->s_nr_users));

      for (i=0; i < ntohl(jsb->s_nr_users); i++) {
            uuid_unparse(&jsb->s_users[i*16], str);
            printf(i ? "                          %s\n"
                   : _("Journal users:            %s\n"),
                   str);
      }
}

static void parse_extended_opts(const char *opts, blk_t *superblock, 
                        int *blocksize)
{
      char  *buf, *token, *next, *p, *arg, *badopt = "";
      int   len;
      int   usage = 0;

      len = strlen(opts);
      buf = malloc(len+1);
      if (!buf) {
            fprintf(stderr,
                  _("Couldn't allocate memory to parse options!\n"));
            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 (strcmp(token, "superblock") == 0 ||
                strcmp(token, "sb") == 0) {
                  if (!arg) {
                        usage++;
                        badopt = token;
                        continue;
                  }
                  *superblock = strtoul(arg, &p, 0);
                  if (*p) {
                        fprintf(stderr,
                              _("Invalid superblock parameter: %s\n"),
                              arg);
                        usage++;
                        continue;
                  }
            } else if (strcmp(token, "blocksize") == 0 ||
                     strcmp(token, "bs") == 0) {
                  if (!arg) {
                        usage++;
                        badopt = token;
                        continue;
                  }
                  *blocksize = strtoul(arg, &p, 0);
                  if (*p) {
                        fprintf(stderr,
                              _("Invalid blocksize parameter: %s\n"),
                              arg);
                        usage++;
                        continue;
                  }
            } else {
                  usage++;
                  badopt = token;
            }
      }
      if (usage) {
            fprintf(stderr, _("\nBad extended option(s) specified: %s\n\n"
                  "Extended options are separated by commas, "
                  "and may take an argument which\n"
                  "\tis set off by an equals ('=') sign.\n\n"
                  "Valid extended options are:\n"
                  "\tsuperblock=<superblock number>\n"
                  "\tblocksize=<blocksize>\n"),
                  badopt);
            free(buf);
            exit(1);
      }
      free(buf);
}     

int main (int argc, char ** argv)
{
      errcode_t   retval;
      ext2_filsys fs;
      int         print_badblocks = 0;
      int         use_superblock = 0;
      int         use_blocksize = 0;
      int         image_dump = 0;
      int         force = 0;
      int         flags;
      int         header_only = 0;
      int         big_endian;
      int         c;

#ifdef ENABLE_NLS
      setlocale(LC_MESSAGES, "");
      setlocale(LC_CTYPE, "");
      bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
      textdomain(NLS_CAT_NAME);
#endif
      add_error_table(&et_ext2_error_table);
      fprintf (stderr, "dumpe2fs %s (%s)\n", E2FSPROGS_VERSION,
             E2FSPROGS_DATE);
      if (argc && *argv)
            program_name = *argv;
      
      while ((c = getopt (argc, argv, "bfhixVo:")) != EOF) {
            switch (c) {
            case 'b':
                  print_badblocks++;
                  break;
            case 'f':
                  force++;
                  break;
            case 'h':
                  header_only++;
                  break;
            case 'i':
                  image_dump++;
                  break;
            case 'o':
                  parse_extended_opts(optarg, &use_superblock, 
                                  &use_blocksize);
                  break;
            case 'V':
                  /* Print version number and exit */
                  fprintf(stderr, _("\tUsing %s\n"),
                        error_message(EXT2_ET_BASE));
                  exit(0);
            case 'x':
                  hex_format++;
                  break;
            default:
                  usage();
            }
      }
      if (optind > argc - 1)
            usage();
      device_name = argv[optind++];
      flags = EXT2_FLAG_JOURNAL_DEV_OK | EXT2_FLAG_SOFTSUPP_FEATURES;
      if (force)
            flags |= EXT2_FLAG_FORCE;
      if (image_dump)
            flags |= EXT2_FLAG_IMAGE_FILE;
      
      if (use_superblock && !use_blocksize) {
            for (use_blocksize = EXT2_MIN_BLOCK_SIZE;
                 use_blocksize <= EXT2_MAX_BLOCK_SIZE;
                 use_blocksize *= 2) {
                  retval = ext2fs_open (device_name, flags,
                                    use_superblock,
                                    use_blocksize, unix_io_manager,
                                    &fs);
                  if (!retval)
                        break;
            }
      } else
            retval = ext2fs_open (device_name, flags, use_superblock,
                              use_blocksize, unix_io_manager, &fs);
      if (retval) {
            com_err (program_name, retval, _("while trying to open %s"),
                   device_name);
            printf (_("Couldn't find valid filesystem superblock.\n"));
            exit (1);
      }
      if (print_badblocks) {
            list_bad_blocks(fs, 1);
      } else {
            big_endian = ((fs->flags & EXT2_FLAG_SWAP_BYTES) != 0);
#ifdef WORDS_BIGENDIAN
            big_endian = !big_endian;
#endif
            if (big_endian)
                  printf(_("Note: This is a byte-swapped filesystem\n"));
            list_super (fs->super);
            if (fs->super->s_feature_incompat &
                  EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
                  print_journal_information(fs);
                  ext2fs_close(fs);
                  exit(0);
            }
            if (fs->super->s_feature_compat &
                  EXT3_FEATURE_COMPAT_HAS_JOURNAL)
                  print_inline_journal_information(fs);
            list_bad_blocks(fs, 0);
            if (header_only) {
                  ext2fs_close (fs);
                  exit (0);
            }
            retval = ext2fs_read_bitmaps (fs);
            list_desc (fs);
            if (retval) {
                  printf(_("\n%s: %s: error reading bitmaps: %s\n"),
                         program_name, device_name,
                         error_message(retval));
            }
      }
      ext2fs_close (fs);
      remove_error_table(&et_ext2_error_table);
      exit (0);
}

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