LXR busybox/e2fsprogs/old_e2fsprogs/ext2fs/read

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * read_bb --- read the bad blocks inode
   4 *
   5 * Copyright (C) 1994 Theodore Ts'o.
   6 *
   7 * %Begin-Header%
   8 * This file may be redistributed under the terms of the GNU Public
   9 * License.
  10 * %End-Header%
  11 */
  12
  13#include <stdio.h>
  14#include <string.h>
  15#if HAVE_UNISTD_H
  16#include <unistd.h>
  17#endif
  18#include <fcntl.h>
  19#include <time.h>
  20#if HAVE_SYS_STAT_H
  21#include <sys/stat.h>
  22#endif
  23#if HAVE_SYS_TYPES_H
  24#include <sys/types.h>
  25#endif
  26
  27#include "ext2_fs.h"
  28#include "ext2fs.h"
  29
  30struct read_bb_record {
  31        ext2_badblocks_list     bb_list;
  32        errcode_t       err;
  33};
  34
  35/*
  36 * Helper function for ext2fs_read_bb_inode()
  37 */
  38#ifdef __TURBOC__
  39# pragma argsused
  40#endif
  41static int mark_bad_block(ext2_filsys fs, blk_t *block_nr,
  42                          e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
  43                          blk_t ref_block EXT2FS_ATTR((unused)),
  44                          int ref_offset EXT2FS_ATTR((unused)),
  45                          void *priv_data)
  46{
  47        struct read_bb_record *rb = (struct read_bb_record *) priv_data;
  48
  49        if (blockcnt < 0)
  50                return 0;
  51
  52        if ((*block_nr < fs->super->s_first_data_block) ||
  53            (*block_nr >= fs->super->s_blocks_count))
  54                return 0;       /* Ignore illegal blocks */
  55
  56        rb->err = ext2fs_badblocks_list_add(rb->bb_list, *block_nr);
  57        if (rb->err)
  58                return BLOCK_ABORT;
  59        return 0;
  60}
  61
  62/*
  63 * Reads the current bad blocks from the bad blocks inode.
  64 */
  65errcode_t ext2fs_read_bb_inode(ext2_filsys fs, ext2_badblocks_list *bb_list)
  66{
  67        errcode_t       retval;
  68        struct read_bb_record rb;
  69        struct ext2_inode inode;
  70        blk_t   numblocks;
  71
  72        EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
  73
  74        if (!*bb_list) {
  75                retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode);
  76                if (retval)
  77                        return retval;
  78                if (inode.i_blocks < 500)
  79                        numblocks = (inode.i_blocks /
  80                                     (fs->blocksize / 512)) + 20;
  81                else
  82                        numblocks = 500;
  83                retval = ext2fs_badblocks_list_create(bb_list, numblocks);
  84                if (retval)
  85                        return retval;
  86        }
  87
  88        rb.bb_list = *bb_list;
  89        rb.err = 0;
  90        retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO, 0, 0,
  91                                      mark_bad_block, &rb);
  92        if (retval)
  93                return retval;
  94
  95        return rb.err;
  96}
  97
  98
  99