118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
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/*
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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 Public
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* License.
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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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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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blk_t group_blk, start_blk, last_blk, new_blk, blk;
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int j;
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group_blk = fs->super->s_first_data_block +
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(group * fs->super->s_blocks_per_group);
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last_blk = group_blk + fs->super->s_blocks_per_group;
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if (last_blk >= fs->super->s_blocks_count)
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last_blk = fs->super->s_blocks_count - 1;
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if (!bmap)
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bmap = fs->block_map;
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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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start_blk = group_blk + fs->inode_blocks_per_group;
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start_blk += ((fs->stride * group) %
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(last_blk - start_blk));
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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 (!fs->group_desc[group].bg_block_bitmap) {
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retval = ext2fs_get_free_blocks(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_blocks(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_bitmap(bmap, new_blk);
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fs->group_desc[group].bg_block_bitmap = new_blk;
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}
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if (!fs->group_desc[group].bg_inode_bitmap) {
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retval = ext2fs_get_free_blocks(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_blocks(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_bitmap(bmap, new_blk);
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fs->group_desc[group].bg_inode_bitmap = new_blk;
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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 (!fs->group_desc[group].bg_inode_table) {
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retval = ext2fs_get_free_blocks(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_bitmap(bmap, blk);
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fs->group_desc[group].bg_inode_table = new_blk;
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}
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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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for (i = 0; i < fs->group_desc_count; 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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return 0;
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}
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