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/*
* bb_inode.c --- routines to update the bad block inode.
*
* WARNING: This routine modifies a lot of state in the filesystem; if
* this routine returns an error, the bad block inode may be in an
* inconsistent state.
*
* Copyright (C) 1994 Theodore Ts'o. This file may be redistributed
* under the terms of the GNU Public License.
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <time.h>
#include <sys/stat.h>
#include <sys/types.h>
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#include <linux/ext2_fs.h>
#include "ext2fs.h"
struct set_badblock_record {
badblocks_iterate bb_iter;
int bad_block_count;
blk_t *ind_blocks;
int max_ind_blocks;
int ind_blocks_size;
int ind_blocks_ptr;
char *block_buf;
errcode_t err;
};
static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr, int blockcnt,
void *private);
static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr, int blockcnt,
void *private);
/*
* Given a bad blocks bitmap, update the bad blocks inode to reflect
* the map.
*/
errcode_t ext2fs_update_bb_inode(ext2_filsys fs, badblocks_list bb_list)
{
errcode_t retval;
struct set_badblock_record rec;
struct ext2_inode inode;
blk_t blk;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
if (!fs->block_map)
return EXT2_ET_NO_BLOCK_BITMAP;
rec.bad_block_count = 0;
rec.ind_blocks_size = rec.ind_blocks_ptr = 0;
rec.max_ind_blocks = 10;
rec.ind_blocks = malloc(rec.max_ind_blocks * sizeof(blk_t));
if (!rec.ind_blocks)
return ENOMEM;
memset(rec.ind_blocks, 0, rec.max_ind_blocks * sizeof(blk_t));
rec.block_buf = malloc(fs->blocksize);
if (!rec.block_buf) {
retval = ENOMEM;
goto cleanup;
}
memset(rec.block_buf, 0, fs->blocksize);
rec.err = 0;
/*
* First clear the old bad blocks (while saving the indirect blocks)
*/
retval = ext2fs_block_iterate(fs, EXT2_BAD_INO,
BLOCK_FLAG_DEPTH_TRAVERSE, 0,
clear_bad_block_proc, &rec);
if (retval)
goto cleanup;
if (rec.err) {
retval = rec.err;
goto cleanup;
}
/*
* Now set the bad blocks!
*
* First, mark the bad blocks as used. This prevents a bad
* block from being used as an indirecto block for the bad
* block inode (!).
*/
if (bb_list) {
retval = badblocks_list_iterate_begin(bb_list, &rec.bb_iter);
if (retval)
goto cleanup;
while (badblocks_list_iterate(rec.bb_iter, &blk)) {
ext2fs_mark_block_bitmap(fs->block_map, blk);
}
badblocks_list_iterate_end(rec.bb_iter);
ext2fs_mark_bb_dirty(fs);
retval = badblocks_list_iterate_begin(bb_list, &rec.bb_iter);
if (retval)
goto cleanup;
retval = ext2fs_block_iterate(fs, EXT2_BAD_INO,
BLOCK_FLAG_APPEND, 0,
set_bad_block_proc, &rec);
badblocks_list_iterate_end(rec.bb_iter);
if (retval)
goto cleanup;
if (rec.err) {
retval = rec.err;
goto cleanup;
}
}
/*
* Update the bad block inode's mod time and block count
* field.
*/
retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode);
if (retval)
goto cleanup;
inode.i_atime = inode.i_mtime = time(0);
if (!inode.i_ctime)
inode.i_ctime = time(0);
inode.i_blocks = rec.bad_block_count * (fs->blocksize / 512);
inode.i_size = rec.bad_block_count * fs->blocksize;
retval = ext2fs_write_inode(fs, EXT2_BAD_INO, &inode);
if (retval)
goto cleanup;
cleanup:
free(rec.ind_blocks);
free(rec.block_buf);
return retval;
}
/*
* Helper function for update_bb_inode()
*
* Clear the bad blocks in the bad block inode, while saving the
* indirect blocks.
*/
static int clear_bad_block_proc(ext2_filsys fs, blk_t *block_nr, int blockcnt,
void *private)
{
struct set_badblock_record *rec = (struct set_badblock_record *)
private;
int group;
if (!*block_nr)
return 0;
/*
* If the block number is outrageous, clear it and ignore it.
*/
if (*block_nr >= fs->super->s_blocks_count ||
*block_nr < fs->super->s_first_data_block) {
*block_nr = 0;
return BLOCK_CHANGED;
}
if (blockcnt < 0) {
if (rec->ind_blocks_size >= rec->max_ind_blocks) {
rec->max_ind_blocks += 10;
rec->ind_blocks = realloc(rec->ind_blocks,
rec->max_ind_blocks *
sizeof(blk_t));
if (!rec->ind_blocks) {
rec->err = ENOMEM;
return BLOCK_ABORT;
}
}
rec->ind_blocks[rec->ind_blocks_size++] = *block_nr;
}
/*
* Mark the block as unused, and update accounting information
*/
ext2fs_unmark_block_bitmap(fs->block_map, *block_nr);
ext2fs_mark_bb_dirty(fs);
group = ext2fs_group_of_blk(fs, *block_nr);
fs->group_desc[group].bg_free_blocks_count++;
fs->super->s_free_blocks_count++;
ext2fs_mark_super_dirty(fs);
*block_nr = 0;
return BLOCK_CHANGED;
}
/*
* Helper function for update_bb_inode()
*
* Set the block list in the bad block inode, using the supplied bitmap.
*/
static int set_bad_block_proc(ext2_filsys fs, blk_t *block_nr,
int blockcnt, void *private)
{
struct set_badblock_record *rec = (struct set_badblock_record *)
private;
errcode_t retval;
blk_t blk;
int group;
if (blockcnt >= 0) {
/*
* Get the next bad block.
*/
if (!badblocks_list_iterate(rec->bb_iter, &blk))
return BLOCK_ABORT;
rec->bad_block_count++;
} else {
/*
* An indirect block; fetch a block from the
* previously used indirect block list. The block
* most be not marked as used; if so, get another one.
* If we run out of reserved indirect blocks, allocate
* a new one.
*/
retry:
if (rec->ind_blocks_ptr < rec->ind_blocks_size) {
blk = rec->ind_blocks[rec->ind_blocks_ptr++];
if (ext2fs_test_block_bitmap(fs->block_map, blk))
goto retry;
} else {
retval = ext2fs_new_block(fs, 0, 0, &blk);
if (retval) {
rec->err = retval;
return BLOCK_ABORT;
}
}
retval = io_channel_write_blk(fs->io, blk, 1, rec->block_buf);
if (retval) {
rec->err = retval;
return BLOCK_ABORT;
}
ext2fs_mark_block_bitmap(fs->block_map, blk);
ext2fs_mark_bb_dirty(fs);
}
/*
* Update block counts
*/
group = ext2fs_group_of_blk(fs, blk);
fs->group_desc[group].bg_free_blocks_count--;
fs->super->s_free_blocks_count--;
ext2fs_mark_super_dirty(fs);
*block_nr = blk;
return BLOCK_CHANGED;
}
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