1 use alloc::{boxed::Box, vec::Vec}; 2 3 use crate::driver::base::block::block_device::BlockId; 4 5 use super::{BlockCacheError, BLOCK_SIZE}; 6 7 /// # 枚举功能 8 /// 该枚举设计来是用于实现回写法的，但是目前并未使用 9 #[allow(dead_code)] 10 pub enum CacheBlockFlag { 11 Unused, 12 Unwrited, 13 Writed, 14 } 15 16 pub type CacheBlockAddr = usize; 17 18 /// # 结构功能 19 /// 存储数据的最小单位 20 pub struct CacheBlock { 21 data: Box<[u8]>, 22 _flag: CacheBlockFlag, 23 lba_id: BlockId, 24 } 25 26 impl CacheBlock { new(data: Box<[u8]>, flag: CacheBlockFlag, lba_id: BlockId) -> Self27 pub fn new(data: Box<[u8]>, flag: CacheBlockFlag, lba_id: BlockId) -> Self { 28 CacheBlock { 29 data, 30 _flag: flag, 31 lba_id, 32 } 33 } 34 from_data(lba_id: BlockId, data: Vec<u8>) -> Self35 pub fn from_data(lba_id: BlockId, data: Vec<u8>) -> Self { 36 let space_box = data.into_boxed_slice(); 37 CacheBlock::new(space_box, CacheBlockFlag::Unwrited, lba_id) 38 } 39 _set_flag(&mut self, _flag: CacheBlockFlag) -> Option<()>40 pub fn _set_flag(&mut self, _flag: CacheBlockFlag) -> Option<()> { 41 todo!() 42 } data(&self, buf: &mut [u8]) -> Result<usize, BlockCacheError>43 pub fn data(&self, buf: &mut [u8]) -> Result<usize, BlockCacheError> { 44 if buf.len() != BLOCK_SIZE { 45 return Err(BlockCacheError::BlockSizeError); 46 } 47 buf.copy_from_slice(&self.data); 48 return Ok(BLOCK_SIZE); 49 } 50 lba_id(&self) -> BlockId51 pub fn lba_id(&self) -> BlockId { 52 self.lba_id 53 } 54 } 55