blob: a7437c96f588d1819b9289a5e830d45206c1917e
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * alloc_sb.c --- Allocate the superblock and block group descriptors for a |
4 | * newly initialized filesystem. Used by mke2fs when initializing a filesystem |
5 | * |
6 | * Copyright (C) 1994, 1995, 1996, 2003 Theodore Ts'o. |
7 | * |
8 | * %Begin-Header% |
9 | * This file may be redistributed under the terms of the GNU Public |
10 | * License. |
11 | * %End-Header% |
12 | */ |
13 | |
14 | #include <stdio.h> |
15 | #include <string.h> |
16 | #if HAVE_UNISTD_H |
17 | #include <unistd.h> |
18 | #endif |
19 | #include <fcntl.h> |
20 | #include <time.h> |
21 | #if HAVE_SYS_STAT_H |
22 | #include <sys/stat.h> |
23 | #endif |
24 | #if HAVE_SYS_TYPES_H |
25 | #include <sys/types.h> |
26 | #endif |
27 | |
28 | #include "ext2_fs.h" |
29 | #include "ext2fs.h" |
30 | |
31 | int ext2fs_reserve_super_and_bgd(ext2_filsys fs, |
32 | dgrp_t group, |
33 | ext2fs_block_bitmap bmap) |
34 | { |
35 | blk_t super_blk, old_desc_blk, new_desc_blk; |
36 | int j, old_desc_blocks, num_blocks; |
37 | |
38 | num_blocks = ext2fs_super_and_bgd_loc(fs, group, &super_blk, |
39 | &old_desc_blk, &new_desc_blk, 0); |
40 | |
41 | if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) |
42 | old_desc_blocks = fs->super->s_first_meta_bg; |
43 | else |
44 | old_desc_blocks = |
45 | fs->desc_blocks + fs->super->s_reserved_gdt_blocks; |
46 | |
47 | if (super_blk || (group == 0)) |
48 | ext2fs_mark_block_bitmap(bmap, super_blk); |
49 | |
50 | if (old_desc_blk) { |
51 | for (j=0; j < old_desc_blocks; j++) |
52 | ext2fs_mark_block_bitmap(bmap, old_desc_blk + j); |
53 | } |
54 | if (new_desc_blk) |
55 | ext2fs_mark_block_bitmap(bmap, new_desc_blk); |
56 | |
57 | return num_blocks; |
58 | } |
59 |