mirror of
https://github.com/nitraiolo/CfgUSBLoader.git
synced 2024-11-30 23:24:15 +01:00
103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
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/*
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* read_bb --- read the bad blocks inode
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*
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* Copyright (C) 1994 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Library
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* General Public License, version 2.
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* %End-Header%
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*/
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#include <stdio.h>
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#include <string.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <fcntl.h>
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#include <time.h>
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include "ext2_fs.h"
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#include "ext2fs.h"
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struct read_bb_record {
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ext2_badblocks_list bb_list;
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errcode_t err;
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};
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/*
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* Helper function for ext2fs_read_bb_inode()
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*/
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#ifdef __TURBOC__
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#pragma argsused
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#endif
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static int mark_bad_block(ext2_filsys fs, blk_t *block_nr,
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e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
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blk_t ref_block EXT2FS_ATTR((unused)),
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int ref_offset EXT2FS_ATTR((unused)),
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void *priv_data)
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{
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struct read_bb_record *rb = (struct read_bb_record *) priv_data;
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if (blockcnt < 0)
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return 0;
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if ((*block_nr < fs->super->s_first_data_block) ||
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(*block_nr >= ext2fs_blocks_count(fs->super)))
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return 0; /* Ignore illegal blocks */
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rb->err = ext2fs_badblocks_list_add(rb->bb_list, *block_nr);
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if (rb->err)
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return BLOCK_ABORT;
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return 0;
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}
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/*
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* Reads the current bad blocks from the bad blocks inode.
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*/
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errcode_t ext2fs_read_bb_inode(ext2_filsys fs, ext2_badblocks_list *bb_list)
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{
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errcode_t retval;
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struct read_bb_record rb;
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struct ext2_inode inode;
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blk_t numblocks;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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if (!*bb_list) {
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retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode);
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if (retval)
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return retval;
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numblocks = inode.i_blocks;
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if (!((fs->super->s_feature_ro_compat &
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EXT4_FEATURE_RO_COMPAT_HUGE_FILE) &&
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(inode.i_flags & EXT4_HUGE_FILE_FL)))
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numblocks = numblocks / (fs->blocksize / 512);
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numblocks += 20;
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if (numblocks < 50)
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numblocks = 50;
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if (numblocks > 50000)
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numblocks = 500;
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retval = ext2fs_badblocks_list_create(bb_list, numblocks);
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if (retval)
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return retval;
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}
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rb.bb_list = *bb_list;
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rb.err = 0;
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retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO, BLOCK_FLAG_READ_ONLY,
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0, mark_bad_block, &rb);
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if (retval)
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return retval;
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return rb.err;
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}
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