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 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
