118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
/*
|
|
* 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;
|
|
}
|
|
|