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 31int 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