OSCourseDesign-public/disk_params.py at main · febilly/OSCourseDesign-public · GitHub

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import constants as C

## 以下是需要计算得出的参数
## 初始为默认值

# 硬盘的参数（用于格式化硬盘）
DISK_START = 0
INODE_BLOCKS = 4096
DISK_BLOCKS = 65536

# 总字节数
TOTAL_BYTES = DISK_BLOCKS * C.BLOCK_BYTES

# 超级块
SUPERBLOCK_START = DISK_START

# Inode
INODE_START = SUPERBLOCK_START + C.SUPERBLOCK_BLOCKS
INODE_COUNT = INODE_BLOCKS * C.INODE_PER_BLOCK

# 数据区
DATA_START = INODE_START + INODE_BLOCKS
DATA_BLOCK_COUNT = DISK_BLOCKS - DATA_START


def init_constants(disk_start: int = 0, inode_blocks: int = 4096, disk_blocks: int = 65536) -> None:
    global DISK_START, INODE_BLOCKS, DISK_BLOCKS
    DISK_START = disk_start
    INODE_BLOCKS = inode_blocks
    DISK_BLOCKS = disk_blocks

    global TOTAL_BYTES, SUPERBLOCK_START, INODE_START, INODE_COUNT, DATA_START, DATA_BLOCK_COUNT
    TOTAL_BYTES = DISK_BLOCKS * C.BLOCK_BYTES
    SUPERBLOCK_START = DISK_START
    INODE_START = SUPERBLOCK_START + C.SUPERBLOCK_BLOCKS
    INODE_COUNT = INODE_BLOCKS * C.INODE_PER_BLOCK
    DATA_START = INODE_START + INODE_BLOCKS
    DATA_BLOCK_COUNT = DISK_BLOCKS - DATA_START