mirror of
https://github.com/nitraiolo/CfgUSBLoader.git
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240 lines
6.8 KiB
C
240 lines
6.8 KiB
C
/*
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* alloc_tables.c --- Allocate tables for a newly initialized
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* filesystem. Used by mke2fs when initializing a filesystem
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*
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* Copyright (C) 1996 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Library
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* General Public License, version 2.
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* %End-Header%
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*/
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#include <stdio.h>
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#include <string.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <fcntl.h>
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#include <time.h>
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include "ext2_fs.h"
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#include "ext2fs.h"
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#include "ext2fsP.h"
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/*
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* This routine searches for free blocks that can allocate a full
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* group of bitmaps or inode tables for a flexbg group. Returns the
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* block number with a correct offset were the bitmaps and inode
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* tables can be allocated continously and in order.
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*/
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static blk64_t flexbg_offset(ext2_filsys fs, dgrp_t group, blk64_t start_blk,
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ext2fs_block_bitmap bmap, int offset, int size,
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int elem_size)
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{
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int flexbg, flexbg_size;
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blk64_t last_blk, first_free = 0;
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dgrp_t last_grp;
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flexbg_size = 1 << fs->super->s_log_groups_per_flex;
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flexbg = group / flexbg_size;
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if (size > (int) (fs->super->s_blocks_per_group / 8))
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size = (int) fs->super->s_blocks_per_group / 8;
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if (offset)
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offset -= 1;
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/*
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* Don't do a long search if the previous block
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* search is still valid.
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*/
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if (start_blk && group % flexbg_size) {
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if (ext2fs_test_block_bitmap_range2(bmap, start_blk + elem_size,
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size))
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return start_blk + elem_size;
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}
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start_blk = ext2fs_group_first_block2(fs, flexbg_size * flexbg);
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last_grp = group | (flexbg_size - 1);
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if (last_grp > fs->group_desc_count)
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last_grp = fs->group_desc_count;
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last_blk = ext2fs_group_last_block2(fs, last_grp);
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/* Find the first available block */
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if (ext2fs_get_free_blocks2(fs, start_blk, last_blk, 1, bmap,
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&first_free))
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return first_free;
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if (ext2fs_get_free_blocks2(fs, first_free + offset, last_blk, size,
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bmap, &first_free))
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return first_free;
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return first_free;
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}
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errcode_t ext2fs_allocate_group_table(ext2_filsys fs, dgrp_t group,
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ext2fs_block_bitmap bmap)
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{
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errcode_t retval;
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blk64_t group_blk, start_blk, last_blk, new_blk, blk;
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dgrp_t last_grp = 0;
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int j, rem_grps = 0, flexbg_size = 0;
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group_blk = ext2fs_group_first_block2(fs, group);
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last_blk = ext2fs_group_last_block2(fs, group);
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if (!bmap)
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bmap = fs->block_map;
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if (EXT2_HAS_INCOMPAT_FEATURE(fs->super,
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EXT4_FEATURE_INCOMPAT_FLEX_BG) &&
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fs->super->s_log_groups_per_flex) {
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flexbg_size = 1 << fs->super->s_log_groups_per_flex;
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last_grp = group | (flexbg_size - 1);
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rem_grps = last_grp - group;
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if (last_grp > fs->group_desc_count)
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last_grp = fs->group_desc_count;
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}
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/*
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* Allocate the block and inode bitmaps, if necessary
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*/
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if (fs->stride) {
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retval = ext2fs_get_free_blocks2(fs, group_blk, last_blk,
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1, bmap, &start_blk);
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if (retval)
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return retval;
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start_blk += fs->inode_blocks_per_group;
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start_blk += ((fs->stride * group) %
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(last_blk - start_blk + 1));
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if (start_blk >= last_blk)
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start_blk = group_blk;
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} else
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start_blk = group_blk;
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if (flexbg_size) {
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blk64_t prev_block = 0;
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if (group && ext2fs_block_bitmap_loc(fs, group - 1))
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prev_block = ext2fs_block_bitmap_loc(fs, group - 1);
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start_blk = flexbg_offset(fs, group, prev_block, bmap,
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0, rem_grps, 1);
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last_blk = ext2fs_group_last_block2(fs, last_grp);
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}
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if (!ext2fs_block_bitmap_loc(fs, group)) {
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retval = ext2fs_get_free_blocks2(fs, start_blk, last_blk,
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1, bmap, &new_blk);
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if (retval == EXT2_ET_BLOCK_ALLOC_FAIL)
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retval = ext2fs_get_free_blocks2(fs, group_blk,
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last_blk, 1, bmap, &new_blk);
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if (retval)
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return retval;
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ext2fs_mark_block_bitmap2(bmap, new_blk);
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ext2fs_block_bitmap_loc_set(fs, group, new_blk);
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if (flexbg_size) {
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dgrp_t gr = ext2fs_group_of_blk2(fs, new_blk);
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ext2fs_bg_free_blocks_count_set(fs, gr, ext2fs_bg_free_blocks_count(fs, gr) - 1);
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ext2fs_free_blocks_count_add(fs->super, -1);
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ext2fs_bg_flags_clear(fs, gr, EXT2_BG_BLOCK_UNINIT);
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ext2fs_group_desc_csum_set(fs, gr);
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}
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}
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if (flexbg_size) {
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blk64_t prev_block = 0;
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if (group && ext2fs_inode_bitmap_loc(fs, group - 1))
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prev_block = ext2fs_inode_bitmap_loc(fs, group - 1);
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start_blk = flexbg_offset(fs, group, prev_block, bmap,
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flexbg_size, rem_grps, 1);
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last_blk = ext2fs_group_last_block2(fs, last_grp);
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}
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if (!ext2fs_inode_bitmap_loc(fs, group)) {
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retval = ext2fs_get_free_blocks2(fs, start_blk, last_blk,
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1, bmap, &new_blk);
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if (retval == EXT2_ET_BLOCK_ALLOC_FAIL)
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retval = ext2fs_get_free_blocks2(fs, group_blk,
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last_blk, 1, bmap, &new_blk);
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if (retval)
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return retval;
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ext2fs_mark_block_bitmap2(bmap, new_blk);
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ext2fs_inode_bitmap_loc_set(fs, group, new_blk);
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if (flexbg_size) {
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dgrp_t gr = ext2fs_group_of_blk2(fs, new_blk);
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ext2fs_bg_free_blocks_count_set(fs, gr, ext2fs_bg_free_blocks_count(fs, gr) - 1);
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ext2fs_free_blocks_count_add(fs->super, -1);
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ext2fs_bg_flags_clear(fs, gr, EXT2_BG_BLOCK_UNINIT);
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ext2fs_group_desc_csum_set(fs, gr);
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}
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}
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/*
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* Allocate the inode table
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*/
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if (flexbg_size) {
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blk64_t prev_block = 0;
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if (group && ext2fs_inode_table_loc(fs, group - 1))
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prev_block = ext2fs_inode_table_loc(fs, group - 1);
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if (last_grp == fs->group_desc_count)
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rem_grps = last_grp - group;
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group_blk = flexbg_offset(fs, group, prev_block, bmap,
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flexbg_size * 2,
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fs->inode_blocks_per_group *
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rem_grps,
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fs->inode_blocks_per_group);
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last_blk = ext2fs_group_last_block2(fs, last_grp);
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}
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if (!ext2fs_inode_table_loc(fs, group)) {
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retval = ext2fs_get_free_blocks2(fs, group_blk, last_blk,
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fs->inode_blocks_per_group,
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bmap, &new_blk);
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if (retval)
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return retval;
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for (j=0, blk = new_blk;
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j < fs->inode_blocks_per_group;
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j++, blk++) {
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ext2fs_mark_block_bitmap2(bmap, blk);
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if (flexbg_size) {
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dgrp_t gr = ext2fs_group_of_blk2(fs, blk);
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ext2fs_bg_free_blocks_count_set(fs, gr, ext2fs_bg_free_blocks_count(fs, gr) - 1);
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ext2fs_free_blocks_count_add(fs->super, -1);
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ext2fs_bg_flags_clear(fs, gr,
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EXT2_BG_BLOCK_UNINIT);
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ext2fs_group_desc_csum_set(fs, gr);
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}
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}
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ext2fs_inode_table_loc_set(fs, group, new_blk);
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}
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ext2fs_group_desc_csum_set(fs, group);
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return 0;
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}
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errcode_t ext2fs_allocate_tables(ext2_filsys fs)
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{
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errcode_t retval;
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dgrp_t i;
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struct ext2fs_numeric_progress_struct progress;
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ext2fs_numeric_progress_init(fs, &progress, NULL,
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fs->group_desc_count);
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for (i = 0; i < fs->group_desc_count; i++) {
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ext2fs_numeric_progress_update(fs, &progress, i);
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retval = ext2fs_allocate_group_table(fs, i, fs->block_map);
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if (retval)
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return retval;
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}
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ext2fs_numeric_progress_close(fs, &progress, NULL);
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return 0;
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}
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