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/* vi: set sw=4 ts=4: */
/*
* alloc_tables.c --- Allocate tables for a newly initialized
* filesystem. Used by mke2fs when initializing a filesystem
*
* Copyright (C) 1996 Theodore Ts'o.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
#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"
errcode_t ext2fs_allocate_group_table(ext2_filsys fs, dgrp_t group,
ext2fs_block_bitmap bmap)
{
errcode_t retval;
blk_t group_blk, start_blk, last_blk, new_blk, blk;
int j;
group_blk = fs->super->s_first_data_block +
(group * fs->super->s_blocks_per_group);
last_blk = group_blk + fs->super->s_blocks_per_group;
if (last_blk >= fs->super->s_blocks_count)
last_blk = fs->super->s_blocks_count - 1;
if (!bmap)
bmap = fs->block_map;
/*
* Allocate the block and inode bitmaps, if necessary
*/
if (fs->stride) {
start_blk = group_blk + fs->inode_blocks_per_group;
start_blk += ((fs->stride * group) %
(last_blk - start_blk));
if (start_blk > last_blk)
start_blk = group_blk;
} else
start_blk = group_blk;
if (!fs->group_desc[group].bg_block_bitmap) {
retval = ext2fs_get_free_blocks(fs, start_blk, last_blk,
1, bmap, &new_blk);
if (retval == EXT2_ET_BLOCK_ALLOC_FAIL)
retval = ext2fs_get_free_blocks(fs, group_blk,
last_blk, 1, bmap, &new_blk);
if (retval)
return retval;
ext2fs_mark_block_bitmap(bmap, new_blk);
fs->group_desc[group].bg_block_bitmap = new_blk;
}
if (!fs->group_desc[group].bg_inode_bitmap) {
retval = ext2fs_get_free_blocks(fs, start_blk, last_blk,
1, bmap, &new_blk);
if (retval == EXT2_ET_BLOCK_ALLOC_FAIL)
retval = ext2fs_get_free_blocks(fs, group_blk,
last_blk, 1, bmap, &new_blk);
if (retval)
return retval;
ext2fs_mark_block_bitmap(bmap, new_blk);
fs->group_desc[group].bg_inode_bitmap = new_blk;
}
/*
* Allocate the inode table
*/
if (!fs->group_desc[group].bg_inode_table) {
retval = ext2fs_get_free_blocks(fs, group_blk, last_blk,
fs->inode_blocks_per_group,
bmap, &new_blk);
if (retval)
return retval;
for (j=0, blk = new_blk;
j < fs->inode_blocks_per_group;
j++, blk++)
ext2fs_mark_block_bitmap(bmap, blk);
fs->group_desc[group].bg_inode_table = new_blk;
}
return 0;
}
errcode_t ext2fs_allocate_tables(ext2_filsys fs)
{
errcode_t retval;
dgrp_t i;
for (i = 0; i < fs->group_desc_count; i++) {
retval = ext2fs_allocate_group_table(fs, i, fs->block_map);
if (retval)
return retval;
}
return 0;
}
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