17 pub type BlockId = usize;
22 pub const LBA_SIZE: usize = 512;
35     fn read_at(&self, offset: usize, len: usize, buf: &mut [u8]) -> Result<usize, SystemError>;  in read_at()  argument
42     fn write_at(&self, offset: usize, len: usize, buf: &[u8]) -> Result<usize, SystemError>;  in write_at()  argument
63         count: usize,  in read_at()  argument
65     ) -> Result<usize, SystemError>;  in read_at()  argument
77         count: usize,  in write_at()  argument
79     ) -> Result<usize, SystemError>;  in write_at()  argument
100     fn block_size(&self) -> usize;  in block_size()  argument
109     fn read_at(&self, offset: usize, len: usize, buf: &mut [u8]) -> Result<usize, SystemError> {  in read_at()  argument
122             let count: usize = (range.lba_end - range.lba_start).try_into().unwrap();  in read_at()
145     fn write_at(&self, offset: usize, len: usize, buf: &[u8]) -> Result<usize, SystemError> {  in write_at()  argument
158             let count: usize = (range.lba_end - range.lba_start).try_into().unwrap();  in write_at()
190     pub begin: usize, // 迭代器的起始位置 -> 块设备的地址 （单位是字节）
191     pub end: usize,
200     pub lba_start: usize, // 起始块的lba_id
201     pub lba_end: usize,   // 终止块的lba_id
202     pub begin: usize, // 起始位置在块内的偏移量， 如果BlockIter启用Multiblock，则是多个块的偏移量
203     pub end: usize,   // 结束位置在块内的偏移量，单位是字节
209     pub fn new(start_addr: usize, end_addr: usize, blk_size_log2: u8) -> BlockIter {  in new()  argument
217     pub fn new_multiblock(start_addr: usize, end_addr: usize, blk_size_log2: u8) -> BlockIter {  in new_multiblock()  argument
301     pub fn len(&self) -> usize {  in len()  argument
314     pub fn origin_begin(&self) -> usize {  in origin_begin()  argument
318     pub fn origin_end(&self) -> usize {  in origin_end()  argument
325 pub fn __bytes_to_lba(addr: usize, blk_size: usize) -> BlockId {  in __bytes_to_lba()  argument
331 pub fn __lba_to_bytes(lba_id: usize, blk_size: usize) -> BlockId {  in __lba_to_bytes()  argument