1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
/* vi: set sw=4 ts=4: */
/*
* alloc_sb.c --- Allocate the superblock and block group descriptors for a
* newly initialized filesystem. Used by mke2fs when initializing a filesystem
*
* Copyright (C) 1994, 1995, 1996, 2003 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"
int ext2fs_reserve_super_and_bgd(ext2_filsys fs,
dgrp_t group,
ext2fs_block_bitmap bmap)
{
blk_t super_blk, old_desc_blk, new_desc_blk;
int j, old_desc_blocks, num_blocks;
num_blocks = ext2fs_super_and_bgd_loc(fs, group, &super_blk,
&old_desc_blk, &new_desc_blk, 0);
if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
old_desc_blocks = fs->super->s_first_meta_bg;
else
old_desc_blocks =
fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
if (super_blk || (group == 0))
ext2fs_mark_block_bitmap(bmap, super_blk);
if (old_desc_blk) {
for (j=0; j < old_desc_blocks; j++)
ext2fs_mark_block_bitmap(bmap, old_desc_blk + j);
}
if (new_desc_blk)
ext2fs_mark_block_bitmap(bmap, new_desc_blk);
return num_blocks;
}
|
