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/*
* read_bb --- read the bad blocks inode
*
* Copyright (C) 1994 Theodore Ts'o.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Library
* General Public License, version 2.
* %End-Header%
*/
#include "config.h"
#include <stdio.h>
#include <string.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#include <time.h>
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include "ext2_fs.h"
#include "ext2fs.h"
struct read_bb_record {
ext2_badblocks_list bb_list;
errcode_t err;
};
/*
* Helper function for ext2fs_read_bb_inode()
*/
#ifdef __TURBOC__
#pragma argsused
#endif
static int mark_bad_block(ext2_filsys fs, blk_t *block_nr,
e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
blk_t ref_block EXT2FS_ATTR((unused)),
int ref_offset EXT2FS_ATTR((unused)),
void *priv_data)
{
struct read_bb_record *rb = (struct read_bb_record *) priv_data;
if (blockcnt < 0)
return 0;
if ((*block_nr < fs->super->s_first_data_block) ||
(*block_nr >= ext2fs_blocks_count(fs->super)))
return 0; /* Ignore illegal blocks */
rb->err = ext2fs_badblocks_list_add(rb->bb_list, *block_nr);
if (rb->err)
return BLOCK_ABORT;
return 0;
}
/*
* Reads the current bad blocks from the bad blocks inode.
*/
errcode_t ext2fs_read_bb_inode(ext2_filsys fs, ext2_badblocks_list *bb_list)
{
errcode_t retval;
struct read_bb_record rb;
struct ext2_inode inode;
blk_t numblocks;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
if (!*bb_list) {
retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode);
if (retval)
return retval;
numblocks = inode.i_blocks;
if (!(ext2fs_has_feature_huge_file(fs->super) &&
(inode.i_flags & EXT4_HUGE_FILE_FL)))
numblocks = numblocks / (fs->blocksize / 512);
numblocks += 20;
if (numblocks < 50)
numblocks = 50;
if (numblocks > 50000)
numblocks = 500;
retval = ext2fs_badblocks_list_create(bb_list, numblocks);
if (retval)
return retval;
}
rb.bb_list = *bb_list;
rb.err = 0;
retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO, BLOCK_FLAG_READ_ONLY,
0, mark_bad_block, &rb);
if (retval)
return retval;
return rb.err;
}
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