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271 lines
6.2 KiB
271 lines
6.2 KiB
4 months ago
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/*
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* bb_inode.c --- routines to update the bad block inode.
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*
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* WARNING: This routine modifies a lot of state in the filesystem; if
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* this routine returns an error, the bad block inode may be in an
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* inconsistent state.
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*
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* Copyright (C) 1994, 1995 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 "config.h"
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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 set_badblock_record {
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ext2_badblocks_iterate bb_iter;
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int bad_block_count;
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blk_t *ind_blocks;
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int max_ind_blocks;
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int ind_blocks_size;
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int ind_blocks_ptr;
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char *block_buf;
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errcode_t err;
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};
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static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
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e2_blkcnt_t blockcnt,
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blk_t ref_block, int ref_offset,
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void *priv_data);
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static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
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e2_blkcnt_t blockcnt,
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blk_t ref_block, int ref_offset,
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void *priv_data);
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/*
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* Given a bad blocks bitmap, update the bad blocks inode to reflect
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* the map.
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*/
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errcode_t ext2fs_update_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 set_badblock_record rec;
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struct ext2_inode inode;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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if (!fs->block_map)
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return EXT2_ET_NO_BLOCK_BITMAP;
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memset(&rec, 0, sizeof(rec));
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rec.max_ind_blocks = 10;
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retval = ext2fs_get_array(rec.max_ind_blocks, sizeof(blk_t),
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&rec.ind_blocks);
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if (retval)
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return retval;
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memset(rec.ind_blocks, 0, rec.max_ind_blocks * sizeof(blk_t));
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retval = ext2fs_get_mem(fs->blocksize, &rec.block_buf);
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if (retval)
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goto cleanup;
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memset(rec.block_buf, 0, fs->blocksize);
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rec.err = 0;
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/*
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* First clear the old bad blocks (while saving the indirect blocks)
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*/
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retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO,
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BLOCK_FLAG_DEPTH_TRAVERSE, 0,
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clear_bad_block_proc, &rec);
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if (retval)
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goto cleanup;
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if (rec.err) {
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retval = rec.err;
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goto cleanup;
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}
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/*
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* Now set the bad blocks!
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*
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* First, mark the bad blocks as used. This prevents a bad
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* block from being used as an indirect block for the bad
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* block inode (!).
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*/
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if (bb_list) {
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retval = ext2fs_badblocks_list_iterate_begin(bb_list,
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&rec.bb_iter);
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if (retval)
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goto cleanup;
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retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO,
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BLOCK_FLAG_APPEND, 0,
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set_bad_block_proc, &rec);
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ext2fs_badblocks_list_iterate_end(rec.bb_iter);
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if (retval)
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goto cleanup;
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if (rec.err) {
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retval = rec.err;
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goto cleanup;
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}
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}
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/*
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* Update the bad block inode's mod time and block count
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* field.
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*/
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retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode);
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if (retval)
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goto cleanup;
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inode.i_atime = inode.i_mtime = fs->now ? fs->now : time(0);
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if (!inode.i_ctime)
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inode.i_ctime = fs->now ? fs->now : time(0);
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ext2fs_iblk_set(fs, &inode, rec.bad_block_count);
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retval = ext2fs_inode_size_set(fs, &inode,
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rec.bad_block_count * fs->blocksize);
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if (retval)
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goto cleanup;
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retval = ext2fs_write_inode(fs, EXT2_BAD_INO, &inode);
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if (retval)
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goto cleanup;
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cleanup:
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ext2fs_free_mem(&rec.ind_blocks);
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ext2fs_free_mem(&rec.block_buf);
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return retval;
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}
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/*
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* Helper function for update_bb_inode()
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*
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* Clear the bad blocks in the bad block inode, while saving the
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* indirect blocks.
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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 clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
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e2_blkcnt_t blockcnt,
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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 set_badblock_record *rec = (struct set_badblock_record *)
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priv_data;
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errcode_t retval;
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unsigned long old_size;
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if (!*block_nr)
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return 0;
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/*
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* If the block number is outrageous, clear it and ignore it.
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*/
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if (*block_nr >= ext2fs_blocks_count(fs->super) ||
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*block_nr < fs->super->s_first_data_block) {
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*block_nr = 0;
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return BLOCK_CHANGED;
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}
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if (blockcnt < 0) {
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if (rec->ind_blocks_size >= rec->max_ind_blocks) {
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old_size = rec->max_ind_blocks * sizeof(blk_t);
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rec->max_ind_blocks += 10;
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retval = ext2fs_resize_mem(old_size,
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rec->max_ind_blocks * sizeof(blk_t),
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&rec->ind_blocks);
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if (retval) {
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rec->max_ind_blocks -= 10;
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rec->err = retval;
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return BLOCK_ABORT;
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}
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}
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rec->ind_blocks[rec->ind_blocks_size++] = *block_nr;
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}
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/*
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* Mark the block as unused, and update accounting information
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*/
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ext2fs_block_alloc_stats2(fs, *block_nr, -1);
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*block_nr = 0;
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return BLOCK_CHANGED;
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}
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/*
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* Helper function for update_bb_inode()
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*
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* Set the block list in the bad block inode, using the supplied bitmap.
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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 set_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
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e2_blkcnt_t blockcnt,
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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 set_badblock_record *rec = (struct set_badblock_record *)
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priv_data;
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errcode_t retval;
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blk_t blk;
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if (blockcnt >= 0) {
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/*
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* Get the next bad block.
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*/
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if (!ext2fs_badblocks_list_iterate(rec->bb_iter, &blk))
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return BLOCK_ABORT;
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rec->bad_block_count++;
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} else {
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/*
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* An indirect block; fetch a block from the
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* previously used indirect block list. The block
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* most be not marked as used; if so, get another one.
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* If we run out of reserved indirect blocks, allocate
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* a new one.
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*/
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retry:
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if (rec->ind_blocks_ptr < rec->ind_blocks_size) {
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blk = rec->ind_blocks[rec->ind_blocks_ptr++];
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if (ext2fs_test_block_bitmap2(fs->block_map, blk))
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goto retry;
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} else {
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retval = ext2fs_new_block(fs, 0, 0, &blk);
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if (retval) {
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rec->err = retval;
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return BLOCK_ABORT;
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}
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}
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retval = io_channel_write_blk64(fs->io, blk, 1, rec->block_buf);
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if (retval) {
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rec->err = retval;
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return BLOCK_ABORT;
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}
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}
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/*
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* Update block counts
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*/
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ext2fs_block_alloc_stats2(fs, blk, +1);
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*block_nr = blk;
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return BLOCK_CHANGED;
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}
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