TXuian
43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
/*
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* Copyright (c) 2020 AIIT XUOS Lab
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* XiUOS is licensed under Mulan PSL v2.
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* You can use this software according to the terms and conditions of the Mulan PSL v2.
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* You may obtain a copy of Mulan PSL v2 at:
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* http://license.coscl.org.cn/MulanPSL2
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PSL v2 for more details.
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*/
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#pragma once
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#include <stdint.h>
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#include "fs.h"
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// Block size
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#define BLOCK_SIZE 512
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// bits size
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#define BITS 8
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// Bitmap size of one block
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#define BITMAP_SIZE (BLOCK_SIZE * BITS)
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// Inode size of one block
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#define INODE_SIZE (BLOCK_SIZE / sizeof(struct Inode))
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// Caculate block bit index
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#define BLOCK_BIT_INDEX(b, ninodes) ((b / BITMAP_SIZE) + (ninodes / INODE_SIZE) + 3)
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// Caculate block index by inode number
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#define BLOCK_INDEX(inum) ((inum / INODE_SIZE) + 2)
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// Caculate inode index in the block
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#define INODE_INDEX(inum) (inum % INODE_SIZE)
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uint8_t* BlockRead(int block_num);
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void BlockFree(int block_num);
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uint32_t BlockAlloc();
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