1 /*
2 * alloc_sb.c --- Allocate the superblock and block group descriptors for a
3 * newly initialized filesystem. Used by mke2fs when initializing a filesystem
4 *
5 * Copyright (C) 1994, 1995, 1996, 2003 Theodore Ts'o.
6 *
7 * %Begin-Header%
8 * This file may be redistributed under the terms of the GNU Public
9 * License.
10 * %End-Header%
11 */
12
13 #include <stdio.h>
14 #include <string.h>
15 #if HAVE_UNISTD_H
16 #include <unistd.h>
17 #endif
18 #include <fcntl.h>
19 #include <time.h>
20 #if HAVE_SYS_STAT_H
21 #include <sys/stat.h>
22 #endif
23 #if HAVE_SYS_TYPES_H
24 #include <sys/types.h>
25 #endif
26
27 #include "ext2_fs.h"
28 #include "ext2fs.h"
29
ext2fs_reserve_super_and_bgd(ext2_filsys fs,dgrp_t group,ext2fs_block_bitmap bmap)30 int ext2fs_reserve_super_and_bgd(ext2_filsys fs,
31 dgrp_t group,
32 ext2fs_block_bitmap bmap)
33 {
34 blk_t super_blk, old_desc_blk, new_desc_blk;
35 int j, old_desc_blocks, num_blocks;
36
37 num_blocks = ext2fs_super_and_bgd_loc(fs, group, &super_blk,
38 &old_desc_blk, &new_desc_blk, 0);
39
40 if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
41 old_desc_blocks = fs->super->s_first_meta_bg;
42 else
43 old_desc_blocks =
44 fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
45
46 if (super_blk || (group == 0))
47 ext2fs_mark_block_bitmap(bmap, super_blk);
48
49 if (old_desc_blk) {
50 for (j=0; j < old_desc_blocks; j++)
51 ext2fs_mark_block_bitmap(bmap, old_desc_blk + j);
52 }
53 if (new_desc_blk)
54 ext2fs_mark_block_bitmap(bmap, new_desc_blk);
55
56 return num_blocks;
57 }
58