mirror of
https://github.com/nitraiolo/CfgUSBLoader.git
synced 2024-11-30 23:24:15 +01:00
87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
/*
|
|
* 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 Library
|
|
* General Public License, version 2.
|
|
* %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"
|
|
|
|
/*
|
|
* This function reserves the superblock and block group descriptors
|
|
* for a given block group. It currently returns the number of free
|
|
* blocks assuming that inode table and allocation bitmaps will be in
|
|
* the group. This is not necessarily the case when the flex_bg
|
|
* feature is enabled, so callers should take care! It was only
|
|
* really intended for use by mke2fs, and even there it's not that
|
|
* useful. In the future, when we redo this function for 64-bit block
|
|
* numbers, we should probably return the number of blocks used by the
|
|
* super block and group descriptors instead.
|
|
*
|
|
* See also the comment for ext2fs_super_and_bgd_loc()
|
|
*/
|
|
int ext2fs_reserve_super_and_bgd(ext2_filsys fs,
|
|
dgrp_t group,
|
|
ext2fs_block_bitmap bmap)
|
|
{
|
|
blk64_t super_blk, old_desc_blk, new_desc_blk;
|
|
blk_t used_blks;
|
|
int j, old_desc_blocks, num_blocks;
|
|
|
|
ext2fs_super_and_bgd_loc2(fs, group, &super_blk,
|
|
&old_desc_blk, &new_desc_blk, &used_blks);
|
|
|
|
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_bitmap2(bmap, super_blk);
|
|
|
|
if (old_desc_blk) {
|
|
if (fs->super->s_reserved_gdt_blocks && fs->block_map == bmap)
|
|
ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT);
|
|
for (j=0; j < old_desc_blocks; j++)
|
|
if (old_desc_blk + j < ext2fs_blocks_count(fs->super))
|
|
ext2fs_mark_block_bitmap2(bmap,
|
|
old_desc_blk + j);
|
|
}
|
|
if (new_desc_blk)
|
|
ext2fs_mark_block_bitmap2(bmap, new_desc_blk);
|
|
|
|
if (group == fs->group_desc_count-1) {
|
|
num_blocks = (ext2fs_blocks_count(fs->super) -
|
|
fs->super->s_first_data_block) %
|
|
fs->super->s_blocks_per_group;
|
|
if (!num_blocks)
|
|
num_blocks = fs->super->s_blocks_per_group;
|
|
} else
|
|
num_blocks = fs->super->s_blocks_per_group;
|
|
|
|
num_blocks -= 2 + fs->inode_blocks_per_group + used_blks;
|
|
|
|
return num_blocks ;
|
|
}
|