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-rw-r--r--ayafs/Cargo.toml18
-rw-r--r--ayafs/src/block_device/disk.rs47
-rw-r--r--ayafs/src/block_device/memory_disk.rs33
-rw-r--r--ayafs/src/block_device/mod.rs10
-rw-r--r--ayafs/src/disk/allocation.rs542
-rw-r--r--ayafs/src/disk/bitmap.rs48
-rw-r--r--ayafs/src/disk/block.rs245
-rw-r--r--ayafs/src/disk/inode.rs312
-rw-r--r--ayafs/src/disk/mod.rs6
-rw-r--r--ayafs/src/filesystem/mod.rs2
-rw-r--r--ayafs/src/filesystem/trait_impl.rs1247
-rw-r--r--ayafs/src/main.rs171
-rw-r--r--ayafs/src/memory/cached_block.rs180
-rw-r--r--ayafs/src/memory/cached_inode.rs178
-rw-r--r--ayafs/src/memory/dir_entry.rs305
-rw-r--r--ayafs/src/memory/file_handle.rs15
-rw-r--r--ayafs/src/memory/mod.rs6
-rw-r--r--ayafs/src/tests/bitmap.rs38
-rw-r--r--ayafs/src/tests/block_cache.rs245
-rw-r--r--ayafs/src/tests/common/mod.rs9
-rw-r--r--ayafs/src/tests/mod.rs6
-rw-r--r--ayafs/src/utils/constants.rs1
-rw-r--r--ayafs/src/utils/mod.rs92
-rw-r--r--ayafs/src/utils/permissions.rs62
24 files changed, 0 insertions, 3818 deletions
diff --git a/ayafs/Cargo.toml b/ayafs/Cargo.toml
deleted file mode 100644
index 43585e0..0000000
--- a/ayafs/Cargo.toml
+++ /dev/null
@@ -1,18 +0,0 @@
-[package]
-name = "ayafs"
-version = "0.1.0"
-edition = "2021"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[dependencies]
-and_then_some = "1.0.0"
-bitflags = "2.4.1"
-clap = { version = "4.4.10", features = ["derive"] }
-env_logger = "0.10.1"
-fuser = "0.14.0"
-indexmap = "2.1.0"
-libc = "0.2.150"
-log = "0.4.20"
-lru = "0.12.1"
-users = "0.11.0"
diff --git a/ayafs/src/block_device/disk.rs b/ayafs/src/block_device/disk.rs
deleted file mode 100644
index 3f0b018..0000000
--- a/ayafs/src/block_device/disk.rs
+++ /dev/null
@@ -1,47 +0,0 @@
-use std::cell::RefCell;
-use std::fs::File;
-use std::io::{Read, Seek, SeekFrom, Write};
-use std::path::{Path, PathBuf};
-use crate::block_device::{BLOCK_SIZE, BlockDevice};
-
-pub struct Disk {
- disk_path: PathBuf,
- device: RefCell<File>,
-}
-
-impl Disk {
- pub fn new(disk_path: PathBuf) -> Self {
- let device = File::options()
- .read(true)
- .write(true)
- .open(disk_path.as_path())
- .unwrap();
- // let device = File::open(disk_path.as_path()).unwrap();
- Self {
- disk_path,
- device: RefCell::new(device),
- }
- }
-}
-
-impl BlockDevice for Disk {
- fn read(&self, block_id: usize, buffer: &mut [u8]) {
- let mut device = self.device.borrow_mut();
- device
- .seek(SeekFrom::Start((block_id * BLOCK_SIZE) as u64))
- .expect("Unable to seek!");
- device
- .read_exact(buffer)
- .expect("Failed to read 4096 bytes!");
- }
-
- fn write(&self, block_id: usize, buffer: &[u8]) {
- let mut device = self.device.borrow_mut();
- device
- .seek(SeekFrom::Start((block_id * BLOCK_SIZE) as u64))
- .expect("Unable to seek!");
- device
- .write_all(buffer)
- .expect("Unable to write 4096 bytes!");
- }
-} \ No newline at end of file
diff --git a/ayafs/src/block_device/memory_disk.rs b/ayafs/src/block_device/memory_disk.rs
deleted file mode 100644
index 0639d3e..0000000
--- a/ayafs/src/block_device/memory_disk.rs
+++ /dev/null
@@ -1,33 +0,0 @@
-use crate::block_device::{BlockDevice, BLOCK_SIZE};
-use std::cell::RefCell;
-
-#[repr(C)]
-pub struct MemoryDisk {
- /// Emulating a block device with a segment of RAM,
- /// which is 64MiB == 4KiB per block * 16384 blocks
- pub arena: RefCell<Vec<u8>>,
-}
-
-impl MemoryDisk {
- pub fn new(block_number: usize) -> Self {
- Self {
- arena: RefCell::new(vec![0u8; BLOCK_SIZE * block_number]),
- }
- }
-}
-
-impl BlockDevice for MemoryDisk {
- fn read(&self, block_id: usize, buffer: &mut [u8]) {
- let block_front = block_id * BLOCK_SIZE;
- let block_back = block_front + BLOCK_SIZE;
- let arena = self.arena.borrow();
- buffer.copy_from_slice(&arena[block_front..block_back]);
- }
-
- fn write(&self, block_id: usize, buffer: &[u8]) {
- let block_front = block_id * BLOCK_SIZE;
- let block_back = block_front + BLOCK_SIZE;
- let mut arena = self.arena.borrow_mut();
- arena[block_front..block_back].copy_from_slice(buffer);
- }
-}
diff --git a/ayafs/src/block_device/mod.rs b/ayafs/src/block_device/mod.rs
deleted file mode 100644
index a1e6544..0000000
--- a/ayafs/src/block_device/mod.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-/// Abstracts for block devices.
-/// Currently only a mock memory disk.
-pub mod memory_disk;
-pub mod disk;
-
-pub const BLOCK_SIZE: usize = 4096;
-pub trait BlockDevice {
- fn read(&self, block_id: usize, buffer: &mut [u8]);
- fn write(&self, block_id: usize, buffer: &[u8]);
-}
diff --git a/ayafs/src/disk/allocation.rs b/ayafs/src/disk/allocation.rs
deleted file mode 100644
index a187fad..0000000
--- a/ayafs/src/disk/allocation.rs
+++ /dev/null
@@ -1,542 +0,0 @@
-use crate::disk::block::{
- Block, DataBlock, DoubleIndirectBlock, IndirectBlock, TripleIndirectBlock,
-};
-use crate::disk::inode::{Inode, DIRECT_NUMBER, ENTRY_PER_BLOCK};
-use crate::memory::cached_block::{convert, CachedBlock};
-use crate::AyaFS;
-use libc::c_int;
-use log::debug;
-
-impl AyaFS {
- /// 为 Inode 分配新 block, 返回 block 的编号和它在 inode 内的编号
- pub(crate) fn allocate_block_for(&mut self, inode: &mut Inode) -> Option<(u32, usize)> {
- // 先看这个 inode 的 direct block 有没有空闲
- for (index_within_direct, index) in inode.direct.iter_mut().enumerate() {
- if !self.data_bitmap.query(*index as usize) {
- let block_index = self.data_bitmap.allocate().unwrap() as u32;
- // println!("allocating {} for direct", block_index);
- *index = block_index;
- inode.n_blocks += 1;
- // 初始化这个 block
- self.init_block(block_index as usize);
- // 当调用 get_inode_mut 拿出 &mut Inode 的时候对应的 block 在 cache 里已经脏了
- return Some((block_index, index_within_direct));
- }
- }
-
- // direct block 全部分配完了, 先检查 indirect block 有没有分配, 没有就分配一个
- if !self.data_bitmap.query(inode.single_indirect as usize) {
- inode.single_indirect = self
- .data_bitmap
- .allocate()
- .expect("No free space for new block") as u32;
- self.init_block(inode.single_indirect as usize);
- // println!("allocating {} for indirect", inode.single_indirect);
- }
- // 在 indirect block 里尝试分配
- if let Some((block_index, index_within_indirect)) =
- self.allocate_in_indirect(inode.single_indirect)
- {
- // println!("allocating {} in indirect", block_index);
- inode.n_blocks += 1;
-
- let index_within_block = DIRECT_NUMBER + index_within_indirect;
- return Some((block_index, index_within_block));
- }
-
- // direct & indirect block 全部分配完了, 先检查 double indirect block 有没有分配, 没有就分配一个
- if !self.data_bitmap.query(inode.double_indirect as usize) {
- inode.double_indirect = self
- .data_bitmap
- .allocate()
- .expect("No free space for new block") as u32;
- self.init_block(inode.double_indirect as usize);
- // println!("allocating {} for double indirect", inode.double_indirect);
- }
- // 在 double indirect block 里尝试分配
- if let Some((block_index, index_within_double)) =
- self.alloc_in_double_indirect(inode.double_indirect)
- {
- // println!("allocating {} in double indirect", block_index);
- inode.n_blocks += 1;
- let index_within_block = DIRECT_NUMBER + ENTRY_PER_BLOCK + index_within_double;
- return Some((block_index, index_within_block));
- }
-
- // direct, indirect & double indirect block 全部分配完了, 先检查 triple indirect block 有没有分配, 没有就分配一个
- if !self.data_bitmap.query(inode.triple_indirect as usize) {
- inode.triple_indirect = self
- .data_bitmap
- .allocate()
- .expect("No free space for new block") as u32;
- self.init_block(inode.triple_indirect as usize);
- // println!("allocating {} for triple indirect", inode.triple_indirect);
- }
- // 在 double indirect block 里尝试分配
- if let Some((block_index, index_within_triple)) =
- self.alloc_in_triple_indirect(inode.triple_indirect)
- {
- // println!("allocating {} in triple indirect", block_index);
- inode.n_blocks += 1;
- let index_within_block = DIRECT_NUMBER
- + ENTRY_PER_BLOCK
- + ENTRY_PER_BLOCK * ENTRY_PER_BLOCK
- + index_within_triple;
- return Some((block_index, index_within_block));
- }
- None
- }
-
- fn allocate_in_indirect(&mut self, indirect_entry: u32) -> Option<(u32, usize)> {
- // 取出 single indirect block, 尝试在里面分配
- let indirect_entry = indirect_entry as usize;
- // println!("finding indirect block with number {}, bitmap says {}", indirect_entry, self.data_bitmap.query(indirect_entry));
-
- if let Some(block) = self
- .get_block(indirect_entry)
- .map(convert::<DataBlock, IndirectBlock>)
- {
- // println!("found indirect block with number {}", indirect_entry);
- let mut indirect_block = block.clone();
- for (index_within_indirect, entry) in
- indirect_block.block.entries.iter_mut().enumerate()
- {
- if self.data_bitmap.query(*entry as usize) == false {
- indirect_block.dirty = true; // 把这个块标记为 dirty
- let block_index = self.data_bitmap.allocate().expect("No free space") as u32;
- self.init_block(block_index as usize);
- *entry = block_index;
- self.update_block(indirect_block);
- return Some((block_index, index_within_indirect));
- }
- }
- }
- None
- }
-
- fn alloc_in_double_indirect(&mut self, double_indirect_entry: u32) -> Option<(u32, usize)> {
- let double_indirect_entry = double_indirect_entry as usize;
-
- if let Some(block) = self
- .get_block(double_indirect_entry)
- .map(convert::<DataBlock, DoubleIndirectBlock>)
- {
- let mut double_indirect_block = block.clone();
- let mut double_indirect_modified = false;
- for (index_within_double_indirect, indirect_entry) in
- double_indirect_block.block.indirect.iter_mut().enumerate()
- {
- if self.data_bitmap.query(*indirect_entry as usize) == false {
- double_indirect_block.dirty = true;
- double_indirect_modified = true;
-
- let indirect_index = self.data_bitmap.allocate().expect("No free space");
- *indirect_entry = indirect_index as u32;
- self.init_block(indirect_index);
- }
-
- if let Some((block_index, index_within_indirect)) =
- self.allocate_in_indirect(*indirect_entry)
- {
- if double_indirect_modified {
- self.update_block(double_indirect_block);
- }
- let index_within_double =
- index_within_double_indirect * ENTRY_PER_BLOCK + index_within_indirect;
- return Some((block_index, index_within_double));
- }
- }
- }
- None
- }
-
- fn alloc_in_triple_indirect(&mut self, triple_indirect_entry: u32) -> Option<(u32, usize)> {
- let triple_indirect_entry = triple_indirect_entry as usize;
-
- if let Some(block) = self
- .get_block(triple_indirect_entry)
- .map(convert::<DataBlock, TripleIndirectBlock>)
- {
- let mut triple_indirect_block = block.clone();
- let mut triple_indirect_modified = false;
- for (index_within_triple_indirect, double_indirect_entry) in triple_indirect_block
- .block
- .double_indirect
- .iter_mut()
- .enumerate()
- {
- if self.data_bitmap.query(*double_indirect_entry as usize) == false {
- triple_indirect_block.dirty = true;
- triple_indirect_modified = true;
-
- let double_indirect_index = self.data_bitmap.allocate().expect("No free space");
- *double_indirect_entry = double_indirect_index as u32;
- self.init_block(double_indirect_index)
- }
- if let Some((block_index, index_within_double_indirect)) =
- self.alloc_in_double_indirect(*double_indirect_entry)
- {
- if triple_indirect_modified {
- self.update_block(triple_indirect_block);
- }
- let index_within_triple =
- index_within_triple_indirect * ENTRY_PER_BLOCK * ENTRY_PER_BLOCK
- + index_within_double_indirect;
- return Some((block_index, index_within_triple));
- }
- }
- }
- None
- }
-}
-
-impl AyaFS {
- pub(crate) fn deallocate_all_blocks_for(&mut self, inode: &Inode) -> Result<(), c_int> {
- // 遍历 direct block 并删除
- for block_index in inode.direct {
- self.data_bitmap.deallocate(block_index as usize);
- }
-
- // 遍历 indirect block 并删除
- if self.data_bitmap.query(inode.single_indirect as usize) {
- let indirect = self
- .get_block::<IndirectBlock>(inode.single_indirect as usize)
- .unwrap();
- for block_index in indirect.block.entries {
- self.data_bitmap.deallocate(block_index as usize);
- }
- self.data_bitmap.deallocate(inode.single_indirect as usize);
- }
-
- // 遍历 double indirect block 并删除
- if self.data_bitmap.query(inode.double_indirect as usize) {
- let double_indirect = self
- .get_block::<DoubleIndirectBlock>(inode.double_indirect as usize)
- .unwrap();
- for indirect_block_index in double_indirect.block.indirect {
- if let Some(indirect) =
- self.get_block::<IndirectBlock>(indirect_block_index as usize)
- {
- for block_index in indirect.block.entries {
- self.data_bitmap.deallocate(block_index as usize);
- }
- self.data_bitmap.deallocate(indirect_block_index as usize);
- }
- }
- self.data_bitmap.deallocate(inode.double_indirect as usize);
- }
-
- // 遍历 triple indirect block 并删除
- if self.data_bitmap.query(inode.triple_indirect as usize) {
- let triple_indirect = self
- .get_block::<TripleIndirectBlock>(inode.triple_indirect as usize)
- .unwrap();
- for double_indirect_block_index in triple_indirect.block.double_indirect {
- if let Some(double_indirect) =
- self.get_block::<DoubleIndirectBlock>(double_indirect_block_index as usize)
- {
- for indirect_block_index in double_indirect.block.indirect {
- if let Some(indirect) =
- self.get_block::<IndirectBlock>(indirect_block_index as usize)
- {
- for block_index in indirect.block.entries {
- self.data_bitmap.deallocate(block_index as usize);
- }
- self.data_bitmap.deallocate(indirect_block_index as usize);
- }
- }
- self.data_bitmap
- .deallocate(double_indirect_block_index as usize);
- }
- }
- self.data_bitmap.deallocate(inode.triple_indirect as usize);
- }
-
- Ok(())
- }
-
- /// 从 inode 中删去最后一个 block
- pub(crate) fn deallocate_block_for(&mut self, inode: &mut Inode) -> Option<u32> {
- // 如果 triple indirect 块存在, 则尝试从中销毁一个块
- if self.data_bitmap.query(inode.triple_indirect as usize) {
- if let Some(block_index) = self.deallocate_from_triple_indirect(inode.triple_indirect) {
- inode.n_blocks -= 1;
- return Some(block_index); // 销毁成功, 直接返回
- } else {
- // 销毁失败, 说明 triple indirect 空了, 把它也销毁.
- self.data_bitmap.deallocate(inode.triple_indirect as usize);
- inode.triple_indirect = 0; // 这个地方理论上应该不用?
- }
- }
- // 如果 double indirect 块存在, 则从其中销毁
- if self.data_bitmap.query(inode.double_indirect as usize) {
- if let Some(block_index) = self.deallocate_from_double_indirect(inode.double_indirect) {
- inode.n_blocks -= 1;
- return Some(block_index);
- } else {
- self.data_bitmap.deallocate(inode.double_indirect as usize);
- inode.double_indirect = 0; // 这个地方理论上应该不用?
- }
- }
- // 如果 indirect 块存在, 则从其中销毁
- if self.data_bitmap.query(inode.single_indirect as usize) {
- if let Some(block_index) = self.deallocate_from_indirect(inode.single_indirect) {
- inode.n_blocks -= 1;
- return Some(block_index);
- } else {
- self.data_bitmap.deallocate(inode.single_indirect as usize);
- inode.single_indirect = 0; // 这个地方理论上应该不用?
- }
- }
- // 都没有，直接从 direct 块中销毁
- for entry in inode.direct.iter_mut().rev() {
- if self.data_bitmap.query(*entry as usize) {
- let index = std::mem::replace(entry, 0); // let index = *entry; *entry = 0;
- inode.n_blocks -= 1;
- self.data_bitmap.deallocate(index as usize);
- return Some(index);
- }
- }
- None
- }
-
- fn deallocate_from_triple_indirect(&mut self, triple_indirect_entry: u32) -> Option<u32> {
- let triple_indirect_entry = triple_indirect_entry as usize;
- if let Some(triple_indirect_block) = self
- .get_block(triple_indirect_entry)
- .map(convert::<DataBlock, TripleIndirectBlock>)
- {
- let mut triple_indirect_block = triple_indirect_block.clone();
- let mut block_modified = false;
- for double_indirect_entry in
- triple_indirect_block.block.double_indirect.iter_mut().rev()
- {
- // 如果这个位置的 double indirect 存在
- if self.data_bitmap.query(*double_indirect_entry as usize) {
- // 尝试从中销毁一个块
- if let Some(block_index) =
- self.deallocate_from_double_indirect(*double_indirect_entry)
- {
- if block_modified {
- self.update_block(triple_indirect_block);
- }
- return Some(block_index); // 成功则直接返回
- } else {
- // 失败则把这个 double indirect 销毁
- let double_indirect_entry_to_deallocate =
- std::mem::replace(double_indirect_entry, 0);
- self.data_bitmap
- .deallocate(double_indirect_entry_to_deallocate as usize);
- triple_indirect_block.dirty = true;
- block_modified = true;
- }
- }
- }
- if block_modified {
- self.update_block(triple_indirect_block);
- }
- }
- None
- }
-
- fn deallocate_from_double_indirect(&mut self, double_indirect_entry: u32) -> Option<u32> {
- let double_indirect_entry = double_indirect_entry as usize;
- if let Some(double_indirect_block) = self
- .get_block(double_indirect_entry)
- .map(convert::<DataBlock, DoubleIndirectBlock>)
- {
- let mut double_indirect_block = double_indirect_block.clone();
- let mut block_modified = false;
- for indirect_entry in double_indirect_block.block.indirect.iter_mut().rev() {
- // 如果这个位置的 indirect 存在
- if self.data_bitmap.query(*indirect_entry as usize) {
- // 尝试从中销毁一个块
- if let Some(block_index) = self.deallocate_from_indirect(*indirect_entry) {
- if block_modified {
- self.update_block(double_indirect_block);
- }
- return Some(block_index); // 成功则直接返回
- } else {
- // 失败则把这个 indirect 销毁
- let indirect_entry_to_deallocate = std::mem::replace(indirect_entry, 0);
- self.data_bitmap
- .deallocate(indirect_entry_to_deallocate as usize);
- double_indirect_block.dirty = true;
- block_modified = true;
- }
- }
- }
- if block_modified {
- self.update_block(double_indirect_block);
- }
- }
- None
- }
-
- fn deallocate_from_indirect(&mut self, indirect_entry: u32) -> Option<u32> {
- let indirect_entry = indirect_entry as usize;
- if let Some(indirect_block) = self
- .get_block(indirect_entry)
- .map(convert::<DataBlock, IndirectBlock>)
- {
- let mut indirect_block = indirect_block.clone();
- // 遍历 indirect block 里的每个 block
- for entry in indirect_block.block.entries.iter_mut().rev() {
- // 如果这个 block 存在, 销毁它
- if self.data_bitmap.query(*entry as usize) {
- let entry_to_deallocate = std::mem::replace(entry, 0);
-
- self.data_bitmap.deallocate(entry_to_deallocate as usize);
- indirect_block.dirty = true;
- self.update_block(indirect_block);
-
- return Some(entry_to_deallocate);
- }
- }
- }
- None
- }
-}
-
-impl AyaFS {
- pub(crate) fn get_block_index(
- &mut self,
- inode: &Inode,
- mut block_index_within_inode: usize,
- ) -> Option<usize> {
- debug!(
- "get_block_index(block_index_within_inode: {})",
- block_index_within_inode
- );
- // direct block
- if block_index_within_inode < DIRECT_NUMBER {
- let block_index = inode.direct[block_index_within_inode] as usize;
- debug!(" get_block_index -> direct");
- return if self.data_bitmap.query(block_index) {
- debug!(" get_block_index -> direct -> ✓");
- Some(block_index)
- } else {
- debug!(" get_block_index -> direct -> ×");
- None
- };
- } else {
- block_index_within_inode -= DIRECT_NUMBER;
- }
-
- // indirect block
- let indirect_number = ENTRY_PER_BLOCK;
- if block_index_within_inode < indirect_number {
- return if let Some(indirect_block) =
- self.get_block::<IndirectBlock>(inode.single_indirect as usize)
- {
- debug!(" get_block_index -> indirect");
- let block_index = indirect_block.block.entries[block_index_within_inode] as usize;
- if self.data_bitmap.query(block_index) {
- debug!(" get_block_index -> indirect -> ✓");
- Some(block_index)
- } else {
- debug!(" get_block_index -> indirect -> ×");
- None
- }
- } else {
- debug!(" get_block_index -> indirect -> ×");
- None
- };
- } else {
- block_index_within_inode -= indirect_number;
- }
-
- // double indirect block
- let double_indirect_number = ENTRY_PER_BLOCK * ENTRY_PER_BLOCK;
- if block_index_within_inode < double_indirect_number {
- if let Some(double_indirect_block) =
- self.get_block::<DoubleIndirectBlock>(inode.double_indirect as usize)
- {
- debug!(" get_block_index -> double_indirect");
- // 取出 double indirect block
- let indirect_block_index = double_indirect_block.block.indirect
- [block_index_within_inode / ENTRY_PER_BLOCK]
- as usize;
- // 要找的 entry 在 double indirect block 中的第几个 indirect block
- if let Some(indirect_block) = self.get_block::<IndirectBlock>(indirect_block_index)
- {
- debug!(" get_block_index -> double_indirect -> indirect");
- let block_index = indirect_block.block.entries
- [block_index_within_inode % ENTRY_PER_BLOCK]
- as usize;
- // 拿到 DirectoryBlock 的 index
- return if self.data_bitmap.query(block_index) {
- debug!(" get_block_index -> double_indirect -> indirect -> ✓");
- Some(block_index)
- } else {
- debug!(" get_block_index -> double_indirect -> indirect -> ×");
- None
- };
- }
- }
- return None;
- } else {
- block_index_within_inode -= double_indirect_number;
- }
-
- // triple indirect block
- if let Some(triple_indirect_block) =
- self.get_block::<TripleIndirectBlock>(inode.triple_indirect as usize)
- {
- // 取出 triple indirect block
- let double_indirect_block_index = triple_indirect_block.block.double_indirect
- [block_index_within_inode / (ENTRY_PER_BLOCK * ENTRY_PER_BLOCK)]
- as usize;
- // 要找的 entry 在 triple indirect block 中的第几个 double indirect block
- if let Some(double_indirect_block) =
- self.get_block::<DoubleIndirectBlock>(double_indirect_block_index)
- {
- // 取出 double indirect block
- let indirect_block_index = double_indirect_block.block.indirect
- [block_index_within_inode % (ENTRY_PER_BLOCK * ENTRY_PER_BLOCK)
- / ENTRY_PER_BLOCK] as usize;
- // 要找的 entry 在 double indirect block 中的第几个 indirect block
- if let Some(indirect_block) = self.get_block::<IndirectBlock>(indirect_block_index)
- {
- let block_index = indirect_block.block.entries
- [block_index_within_inode % ENTRY_PER_BLOCK]
- as usize;
- // DirectoryBlock 的 index
- return if self.data_bitmap.query(block_index) {
- Some(block_index)
- } else {
- None
- };
- }
- }
- }
-
- None
- }
-
- pub(crate) fn access_block<T: Block>(
- &mut self,
- inode: &Inode,
- block_index_within_inode: usize,
- ) -> Option<&CachedBlock<T>> {
- self.get_block_index(inode, block_index_within_inode)
- .map(|block_index| {
- self.get_block::<T>(block_index).unwrap() // 可以 unwrap 吧这里 ??
- })
- }
-
- pub(crate) fn access_block_mut<T: Block>(
- &mut self,
- inode: &Inode,
- block_index_within_inode: usize,
- ) -> Option<&mut CachedBlock<T>> {
- self.get_block_index(inode, block_index_within_inode)
- .map(|block_index| {
- debug!(
- "access_block_mut(index: {}) found",
- block_index_within_inode
- );
- self.get_block_mut::<T>(block_index).unwrap() // 可以 unwrap 吧这里 ??
- })
- }
-}
diff --git a/ayafs/src/disk/bitmap.rs b/ayafs/src/disk/bitmap.rs
deleted file mode 100644
index b68c341..0000000
--- a/ayafs/src/disk/bitmap.rs
+++ /dev/null
@@ -1,48 +0,0 @@
-use crate::block_device::{BlockDevice, BLOCK_SIZE};
-use std::sync::Arc;
-
-pub struct Bitmap {
- pub starting_block: usize,
- pub length: usize,
- pub device: Arc<dyn BlockDevice>,
- pub data: Vec<u8>,
-}
-
-impl Bitmap {
- pub(crate) fn new(starting_block: usize, length: usize, device: Arc<dyn BlockDevice>) -> Self {
- Self {
- starting_block,
- length,
- device,
- data: vec![0u8; length * BLOCK_SIZE],
- }
- }
- pub(crate) fn allocate(&mut self) -> Option<usize> {
- for (i, byte) in self.data.iter_mut().enumerate() {
- let leading_ones = byte.leading_ones();
- if leading_ones != 8 {
- *byte |= (1 << (7 - leading_ones)) as u8;
- return Some(i * 8 + leading_ones as usize);
- }
- }
- None
- }
-
- pub(crate) fn query(&self, index: usize) -> bool {
- if index == 0 {
- false
- } else {
- self.data[index / 8] & ((1 << (7 - index % 8)) as u8) != 0
- }
- }
-
- pub(crate) fn deallocate(&mut self, index: usize) -> bool {
- if self.query(index) {
- let mask = !(1u8 << (7 - index % 8));
- self.data[index / 8] &= mask;
- true
- } else {
- false
- }
- }
-}
diff --git a/ayafs/src/disk/block.rs b/ayafs/src/disk/block.rs
deleted file mode 100644
index 73819e2..0000000
--- a/ayafs/src/disk/block.rs
+++ /dev/null
@@ -1,245 +0,0 @@
-use crate::disk::inode::Inode;
-use std::ffi::{OsStr, OsString};
-use std::os::unix::ffi::OsStrExt;
-
-pub trait Block: Default + Clone {}
-
-#[repr(C)]
-#[derive(Clone)]
-pub struct DataBlock(pub(crate) [u8; 4096]);
-
-impl Default for DataBlock {
- fn default() -> Self {
- Self([0; 4096])
- }
-}
-
-impl Block for DataBlock {}
-
-#[repr(C)]
-#[derive(Clone)]
-pub struct InodeBlock {
- pub(crate) inodes: [Inode; 32],
-}
-
-impl Default for InodeBlock {
- fn default() -> Self {
- Self {
- inodes: [
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- Inode::empty(),
- ],
- }
- }
-}
-
-impl Block for InodeBlock {}
-
-#[repr(C)]
-#[derive(Clone)]
-pub struct DirectoryEntry {
- pub inode: u32,
- pub record_len: u16,
- pub name_len: u8,
- pub file_type: u8,
- pub name: [u8; 256],
-}
-
-impl DirectoryEntry {
- pub(crate) fn name(&self) -> OsString {
- let name = &self.name[0..self.name_len as usize];
- OsStr::from_bytes(name).to_os_string()
- }
-}
-
-impl Default for DirectoryEntry {
- fn default() -> Self {
- Self {
- inode: 0,
- record_len: 0,
- name_len: 0,
- file_type: 0x0,
- name: [0; 256],
- }
- }
-}
-
-#[repr(C)]
-#[derive(Clone)]
-pub struct DirectoryBlock {
- pub entries: [DirectoryEntry; 15],
- pub occupancy: [u8; 2],
- reserved: [u8; 134],
-}
-
-impl Default for DirectoryBlock {
- fn default() -> Self {
- Self {
- entries: [
- DirectoryEntry::default(),
- DirectoryEntry::default(),
- DirectoryEntry::default(),
- DirectoryEntry::default(),
- DirectoryEntry::default(),
- DirectoryEntry::default(),
- DirectoryEntry::default(),
- DirectoryEntry::default(),
- DirectoryEntry::default(),
- DirectoryEntry::default(),
- DirectoryEntry::default(),
- DirectoryEntry::default(),
- DirectoryEntry::default(),
- DirectoryEntry::default(),
- DirectoryEntry::default(),
- ],
- occupancy: [0x80, 0x00], // 0b1000_0000
- reserved: [0xFF; 134],
- }
- }
-}
-
-impl DirectoryBlock {
- #[allow(unused)]
- pub(crate) fn is_full(&self) -> bool {
- self.occupancy[0] == 0xFF && self.occupancy[1] == 0xFF
- }
-
- pub(crate) fn query(&self, mut index: usize) -> bool {
- if index < 7 {
- // 0-6, first u8
- index = index + 1;
- self.occupancy[0] & (1 << (7 - index)) as u8 != 0
- } else if index < 15 {
- // 7-14, second u8
- index = index - 7;
- self.occupancy[1] & (1 << (7 - index)) as u8 != 0
- } else {
- false
- }
- }
-
- pub(crate) fn allocate(&mut self, mut index: usize) -> bool {
- if index < 7 {
- index = index + 1;
- let mask = (1 << (7 - index)) as u8;
- if self.occupancy[0] & mask != 0 {
- false
- } else {
- self.occupancy[0] |= mask;
- true
- }
- } else {
- index = index - 7;
- let mask = (1 << (7 - index)) as u8;
- if self.occupancy[1] & mask != 0 {
- false
- } else {
- self.occupancy[1] |= mask;
- true
- }
- }
- }
-
- // pub(crate) fn allocate(&mut self) -> Option<usize> {
- // if self.occupancy[0] != 0xFF {
- // let leading_ones = self.occupancy[0].leading_ones();
- // self.occupancy[0] |= (1 << (7 - leading_ones)) as u8;
- // Some(leading_ones as usize)
- // } else if self.occupancy[1] != 0xFF {
- // let leading_ones = self.occupancy[1].leading_ones();
- // self.occupancy[1] |= (1 << (7 - leading_ones)) as u8;
- // Some(7 + leading_ones as usize)
- // } else {
- // None
- // }
- // }
-
- pub(crate) fn deallocate(&mut self, mut index: usize) {
- if index < 7 {
- index = index + 1;
- self.occupancy[0] &= !((1 << (7 - index)) as u8);
- } else if index < 15 {
- // 7-14, second u8
- index = index - 7;
- self.occupancy[1] &= !((1 << (7 - index)) as u8);
- }
- }
-}
-
-impl Block for DirectoryBlock {}
-
-#[repr(C)]
-#[derive(Clone)]
-pub struct IndirectBlock {
- pub entries: [u32; 1024],
-}
-
-impl Default for IndirectBlock {
- fn default() -> Self {
- Self { entries: [0; 1024] }
- }
-}
-
-impl Block for IndirectBlock {}
-
-#[repr(C)]
-#[derive(Clone)]
-pub struct DoubleIndirectBlock {
- pub indirect: [u32; 1024],
-}
-
-impl Default for DoubleIndirectBlock {
- fn default() -> Self {
- Self {
- indirect: [0; 1024],
- }
- }
-}
-
-impl Block for DoubleIndirectBlock {}
-
-#[repr(C)]
-#[derive(Clone)]
-pub struct TripleIndirectBlock {
- pub double_indirect: [u32; 1024],
-}
-
-impl Default for TripleIndirectBlock {
- fn default() -> Self {
- Self {
- double_indirect: [0; 1024],
- }
- }
-}
-
-impl Block for TripleIndirectBlock {}
diff --git a/ayafs/src/disk/inode.rs b/ayafs/src/disk/inode.rs
deleted file mode 100644
index 0c801ad..0000000
--- a/ayafs/src/disk/inode.rs
+++ /dev/null
@@ -1,312 +0,0 @@
-use crate::utils;
-use bitflags::bitflags;
-use fuser::FileType;
-use crate::block_device::BLOCK_SIZE;
-
-pub const DIRECT_NUMBER: usize = 15;
-
-#[derive(Debug, Clone, Copy)]
-pub struct InodeMode(pub u16);
-
-bitflags! {
- impl InodeMode: u16 {
- const IXOTH = 0x0001;
- const IWOTH = 0x0002;
- const IROTH = 0x0004;
- const IXGRP = 0x0008;
- const IWGRP = 0x0010;
- const IRGRP = 0x0020;
- const IXUSR = 0x0040;
- const IWUSR = 0x0080;
- const IRUSR = 0x0100;
- const ISVTX = 0x0200;
- const ISGID = 0x0400;
- const ISUID = 0x0800;
- // These are mutually-exclusive:
- const IFIFO = 0x1000;
- const IFCHR = 0x2000;
- const IFDIR = 0x4000;
- const IFBLK = 0x6000;
- const IFREG = 0x8000;
- const IFLNK = 0xA000;
- const IFSOCK = 0xC000;
- }
-}
-
-impl InodeMode {
- #[allow(unused)]
- pub(crate) fn exec_other(&self) -> bool {
- self.0 & Self::IXOTH.0 != 0
- }
- #[allow(unused)]
- pub(crate) fn write_other(&self) -> bool {
- self.0 & Self::IWOTH.0 != 0
- }
- #[allow(unused)]
- pub(crate) fn read_other(&self) -> bool {
- self.0 & Self::IROTH.0 != 0
- }
- #[allow(unused)]
- pub(crate) fn exec_group(&self) -> bool {
- self.0 & Self::IXGRP.0 != 0
- }
- #[allow(unused)]
- pub(crate) fn write_group(&self) -> bool {
- self.0 & Self::IWGRP.0 != 0
- }
- #[allow(unused)]
- pub(crate) fn read_group(&self) -> bool {
- self.0 & Self::IRGRP.0 != 0
- }
- #[allow(unused)]
- pub(crate) fn exec_user(&self) -> bool {
- self.0 & Self::IXUSR.0 != 0
- }
- #[allow(unused)]
- pub(crate) fn write_user(&self) -> bool {
- self.0 & Self::IWUSR.0 != 0
- }
- #[allow(unused)]
- pub(crate) fn read_user(&self) -> bool {
- self.0 & Self::IRUSR.0 != 0
- }
-
- pub(crate) fn perm(&self) -> u16 {
- self.0 & 0x0FFF
- }
-
- pub(crate) fn is_file(&self) -> bool {
- (self.0 & 0xF000) == Self::IFREG.0
- }
-
- pub(crate) fn is_dir(&self) -> bool {
- (self.0 & 0xF000) == Self::IFDIR.0
- }
-
- pub(crate) fn is_symlink(&self) -> bool {
- self.0 & 0xF000 == Self::IFLNK.0
- }
-
- pub(crate) fn validate(mode_value: u16) -> Option<Self> {
- let valid_flags: [u16; 7] = [0x1000, 0x2000, 0x4000, 0x6000, 0x8000, 0xA000, 0xC000];
- valid_flags
- .contains(&(mode_value & 0xF000))
- .then(|| Self(mode_value))
- }
-}
-
-impl From<InodeMode> for FileType {
- fn from(value: InodeMode) -> Self {
- let type_flag = value.0 & 0xF000;
- match type_flag {
- 0x1000 => FileType::NamedPipe,
- 0x2000 => FileType::CharDevice,
- 0x4000 => FileType::Directory,
- 0x6000 => FileType::BlockDevice,
- 0x8000 => FileType::RegularFile,
- 0xA000 => FileType::Symlink,
- 0xC000 => FileType::Socket,
- _ => panic!("Invalid inode mode {:x}", type_flag),
- }
- }
-}
-
-impl From<InodeMode> for u8 {
- fn from(value: InodeMode) -> Self {
- utils::from_filetype(value.into())
- }
-}
-
-/// Pretty much the same with ext2, with minor changes:
-/// - removed OS dependent attributes (osd1 & osd2)
-/// - removed i_faddr since fragmentation is not supported
-/// - changed uid and gid from u16 to u32
-/// - added more direct blocks for a total size of 128 bytes
-/// TODO: do we need to extend time precision?
-#[repr(C)]
-#[derive(Debug, Clone)]
-pub struct Inode {
- pub mode: InodeMode,
- pub uid: u32,
- pub size: u32,
- pub atime: u32, // access time, in seconds
- pub ctime: u32, // change time, in seconds
- pub mtime: u32, // modify time, in seconds
- pub crtime: u32, // create time, in seconds
- pub gid: u32,
- pub n_links: u16,
- pub n_blocks: u32,
- pub flags: u32, // TODO: do we actually need this? maybe just return 0
- pub direct: [u32; DIRECT_NUMBER],
- pub single_indirect: u32,
- pub double_indirect: u32,
- pub triple_indirect: u32,
- pub generation: u32,
- pub file_acl: u32,
- pub dir_acl: u32, // TODO do we have to implement ACL......?
-}
-
-impl Inode {
- fn new(
- mode: InodeMode,
- uid: u32,
- gid: u32,
- time: u32,
- flags: u32,
- generation: u32,
- file_acl: u32,
- dir_acl: u32,
- ) -> Self {
- Self {
- mode,
- uid,
- size: 0,
- atime: time,
- ctime: time,
- mtime: time,
- crtime: time,
- gid,
- n_links: 1,
- n_blocks: 0,
- flags,
- direct: [0; DIRECT_NUMBER],
- single_indirect: 0,
- double_indirect: 0,
- triple_indirect: 0,
- generation,
- file_acl,
- dir_acl,
- }
- }
-
- #[allow(unused)]
- pub fn make_inode(
- permissions: u16,
- mode: InodeMode,
- uid: u32,
- gid: u32,
- time: u32,
- flags: u32,
- generation: u32,
- file_acl: u32,
- dir_acl: u32,
- ) -> Self {
- Self::new(
- InodeMode(permissions) | mode,
- uid,
- gid,
- time,
- flags,
- generation,
- file_acl,
- dir_acl,
- )
- }
-
- pub fn directory(
- permissions: u16,
- uid: u32,
- gid: u32,
- time: u32,
- flags: u32,
- generation: u32,
- file_acl: u32,
- dir_acl: u32,
- ) -> Self {
- Self::new(
- InodeMode(permissions) | InodeMode::IFDIR,
- uid,
- gid,
- time,
- flags,
- generation,
- file_acl,
- dir_acl,
- )
- }
-
- pub fn file(
- permissions: u16,
- uid: u32,
- gid: u32,
- time: u32,
- flags: u32,
- generation: u32,
- file_acl: u32,
- dir_acl: u32,
- ) -> Self {
- Self::new(
- InodeMode(permissions) | InodeMode::IFREG,
- uid,
- gid,
- time,
- flags,
- generation,
- file_acl,
- dir_acl,
- )
- }
-
- pub fn symlink(
- permissions: u16,
- uid: u32,
- gid: u32,
- time: u32,
- flags: u32,
- generation: u32,
- file_acl: u32,
- dir_acl: u32,
- ) -> Self {
- Self::new(
- InodeMode(permissions) | InodeMode::IFLNK,
- uid,
- gid,
- time,
- flags,
- generation,
- file_acl,
- dir_acl,
- )
- }
-
- pub(crate) fn is_file(&self) -> bool {
- self.mode.is_file()
- }
-
- pub(crate) fn is_dir(&self) -> bool {
- self.mode.is_dir()
- }
-
- pub(crate) fn is_symlink(&self) -> bool {
- self.mode.is_symlink()
- }
-
- pub(crate) fn file_type(&self) -> FileType {
- self.mode.into()
- }
-
- pub fn empty() -> Self {
- Self {
- mode: InodeMode(0),
- uid: 0,
- size: 0,
- atime: 0,
- ctime: 0,
- mtime: 0,
- crtime: 0,
- gid: 0,
- n_links: 0,
- n_blocks: 0,
- flags: 0,
- direct: [0; 15],
- single_indirect: 0,
- double_indirect: 0,
- triple_indirect: 0,
- generation: 0,
- file_acl: 0,
- dir_acl: 0,
- }
- }
-}
-pub const INODE_SIZE: usize = std::mem::size_of::<Inode>();
-pub const ENTRY_PER_BLOCK: usize = BLOCK_SIZE / 4; \ No newline at end of file
diff --git a/ayafs/src/disk/mod.rs b/ayafs/src/disk/mod.rs
deleted file mode 100644
index 878e832..0000000
--- a/ayafs/src/disk/mod.rs
+++ /dev/null
@@ -1,6 +0,0 @@
-pub mod allocation;
-/// On-disk data structures and logic.
-/// Including bitmaps, inodes and blocks.
-pub mod bitmap;
-pub mod block;
-pub mod inode;
diff --git a/ayafs/src/filesystem/mod.rs b/ayafs/src/filesystem/mod.rs
deleted file mode 100644
index 1eaa8e8..0000000
--- a/ayafs/src/filesystem/mod.rs
+++ /dev/null
@@ -1,2 +0,0 @@
-/// Where upper filesystem calls are implemented.
-pub mod trait_impl;
diff --git a/ayafs/src/filesystem/trait_impl.rs b/ayafs/src/filesystem/trait_impl.rs
deleted file mode 100644
index 1c40b92..0000000
--- a/ayafs/src/filesystem/trait_impl.rs
+++ /dev/null
@@ -1,1247 +0,0 @@
-use crate::block_device::BLOCK_SIZE;
-use crate::disk::block::DataBlock;
-use crate::disk::inode::InodeMode;
-use crate::utils::permissions::{check_access, clear_suid_sgid, get_groups};
-use crate::utils::{from_filetype, from_systime, time_now, to_fileattr, to_filetype};
-use crate::{AyaFS, TTL};
-use fuser::TimeOrNow::{Now, SpecificTime};
-use fuser::{
- FileType, Filesystem, KernelConfig, ReplyAttr, ReplyData, ReplyDirectory, ReplyEmpty,
- ReplyEntry, ReplyOpen, ReplyWrite, Request, TimeOrNow,
-};
-use libc::{c_int, EACCES, EBADF, EEXIST, EINVAL, EIO, EISDIR, ENAMETOOLONG, ENOENT, ENOSPC, ENOTDIR, ENOTEMPTY, EPERM, IPOPT_OFFSET, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY, R_OK, S_ISGID, S_ISUID, S_IXGRP, S_IXOTH, S_IXUSR, W_OK, RENAME_NOREPLACE, RENAME_EXCHANGE};
-use log::debug;
-use std::ffi::OsStr;
-use std::os::unix::ffi::OsStrExt;
-use std::path::Path;
-use std::slice;
-use std::time::SystemTime;
-
-impl AyaFS {}
-
-impl Filesystem for AyaFS {
- fn init(&mut self, _req: &Request<'_>, _config: &mut KernelConfig) -> Result<(), c_int> {
- debug!("`init()");
- Ok(())
- }
-
- fn destroy(&mut self) {
- debug!("destroy()");
- // TODO 写回
- }
-
- fn lookup(&mut self, req: &Request<'_>, parent: u64, name: &OsStr, reply: ReplyEntry) {
- if name.len() > 255 {
- reply.error(ENAMETOOLONG);
- return;
- }
-
- let parent = parent as usize;
- if let Some(parent_inode) = self.get_inode(parent) {
- if check_access(
- req.uid(),
- req.gid(),
- parent_inode.uid,
- parent_inode.gid,
- parent_inode.mode,
- R_OK,
- ) {
- let parent_inode = parent_inode.clone();
- match self.lookup_name(parent, &parent_inode, name) {
- Ok((inode_index, _, inode)) => {
- let attr = to_fileattr(inode_index as usize, &inode);
- reply.entry(&TTL, &attr, 0);
- }
- Err(err_code) => reply.error(err_code),
- };
- } else {
- reply.error(EACCES);
- }
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn getattr(&mut self, _req: &Request<'_>, ino: u64, reply: ReplyAttr) {
- if let Some(inode) = self.get_inode(ino as usize) {
- reply.attr(&TTL, &to_fileattr(ino as usize, inode));
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn setattr(
- &mut self,
- req: &Request<'_>,
- ino: u64,
- mode: Option<u32>,
- uid: Option<u32>,
- gid: Option<u32>,
- size: Option<u64>, // 当 setattr 被 ftruncate invoke 时会设置 size
- atime: Option<TimeOrNow>,
- mtime: Option<TimeOrNow>,
- _ctime: Option<SystemTime>,
- fh: Option<u64>, // 当 setattr 被 ftruncate invoke 时会提供 fh
- _crtime: Option<SystemTime>, // 忽略
- _chgtime: Option<SystemTime>, // 忽略
- _bkuptime: Option<SystemTime>, // 忽略
- _flags: Option<u32>, // 忽略
- reply: ReplyAttr,
- ) {
- if let Some(inode) = self.get_inode_mut(ino as usize) {
- // chmod
- if let Some(mode) = mode {
- debug!("chmod on inode {:#x?} mode {:o}", ino, mode);
- if req.uid() != 0 && req.uid() != inode.uid {
- reply.error(EPERM);
- return;
- } // uid == 0 (root) or uid == inode.uid (user itself)
-
- if req.uid() != 0
- && req.gid() != inode.gid
- && !get_groups(req.pid()).contains(&inode.gid)
- {
- inode.mode = InodeMode((mode & !S_ISGID) as u16);
- } else {
- inode.mode = InodeMode(mode as u16);
- }
-
- inode.ctime = time_now();
- reply.attr(&TTL, &to_fileattr(ino as usize, inode));
- return;
- }
-
- // chown
- if uid.is_some() || gid.is_some() {
- debug!("chown on inode {:#x?} uid {:?} gid {:?}", ino, uid, gid);
- if let Some(uid) = uid {
- // 虽然只有 root 可以 chown 但是 user chown 自己也是不报错的
- if req.uid() != 0 && !(uid == inode.uid && uid == req.uid()) {
- reply.error(EPERM);
- return;
- }
- }
- if let Some(gid) = gid {
- // 只有 root 和 file owner 才可以 chgrp
- if req.uid() != 0 && req.uid() != inode.uid {
- reply.error(EPERM);
- return;
- }
- // root 可以任意 chgrp, 非 root 只能修改到用户自己所在的组里
- if req.gid() != 0 && !get_groups(req.pid()).contains(&gid) {
- reply.error(EPERM);
- return;
- }
- }
-
- // 可执行文件要清除 suid & sgid
- if inode.mode.0 & (S_IXUSR | S_IXGRP | S_IXOTH) as u16 != 0 {
- inode.mode = clear_suid_sgid(inode.mode);
- }
-
- // chown 要清除 suid
- if let Some(uid) = uid {
- inode.uid = uid;
- inode.mode.0 &= !S_ISUID as u16;
- }
-
- if let Some(gid) = gid {
- inode.gid = gid;
- if req.uid() != 0 {
- inode.mode.0 &= !S_ISGID as u16;
- }
- }
- inode.ctime = time_now();
- reply.attr(&TTL, &to_fileattr(ino as usize, inode));
- return;
- }
-
- // ftruncate
- if let Some(size) = size {
- // TODO 当大小减小的时候对应 deallocate 块
- debug!("ftruncate on inode {:#x?} size {:?}", ino, size);
- if let Some(file_handle) = fh {
- let mut inode = inode.clone();
- let (inode_index, _read, write) =
- self.file_handle_map.get(&file_handle).unwrap();
- assert_eq!(ino as usize, *inode_index);
- if !write {
- reply.error(EACCES);
- } else {
- inode.size = size as u32;
- reply.attr(&TTL, &to_fileattr(*inode_index, &inode));
- self.update_inode(*inode_index, inode);
- }
- } else {
- if !check_access(req.uid(), req.gid(), inode.uid, inode.gid, inode.mode, W_OK) {
- reply.error(EACCES);
- } else {
- inode.size = size as u32;
- reply.attr(&TTL, &to_fileattr(ino as usize, &inode));
- }
- }
- return;
- }
-
- // time 相关
- if atime.is_some() || mtime.is_some() {
- let current_time = time_now();
- if let Some(atime) = atime {
- debug!("utimensat on inode {:#x?}, atime {:?}", ino, atime);
- // root 和 user 可以随意修改 atime, 其他用户只能 touch (即 atime == Now)
- if req.uid() != 0 && req.uid() != inode.uid && atime != Now {
- reply.error(EPERM);
- return;
- }
-
- if req.uid() != 0
- && req.uid() != inode.uid
- && check_access(
- req.uid(),
- req.gid(),
- inode.uid,
- inode.gid,
- inode.mode,
- R_OK, // atime 来说是 read TODO 对吗
- )
- {
- reply.error(EACCES);
- return;
- }
-
- inode.atime = match atime {
- SpecificTime(time) => from_systime(time),
- Now => current_time,
- };
- inode.ctime = current_time;
- }
- if let Some(mtime) = mtime {
- debug!("utimensat on inode {:#x?}, mtime {:?}", ino, mtime);
- // root 和 user 可以随意修改 mtime, 其他用户只能 mtime == Now
- if req.uid() != 0 && req.uid() != inode.uid && mtime != Now {
- reply.error(EPERM);
- return;
- }
-
- if req.uid() != 0
- && req.uid() != inode.uid
- && check_access(
- req.uid(),
- req.gid(),
- inode.uid,
- inode.gid,
- inode.mode,
- W_OK, // mtime 来说是 write
- )
- {
- reply.error(EACCES);
- return;
- }
-
- inode.mtime = match mtime {
- SpecificTime(time) => from_systime(time),
- Now => current_time,
- };
- inode.ctime = current_time;
- }
- }
- reply.attr(&TTL, &to_fileattr(ino as usize, inode));
- return;
- } else {
- reply.error(ENOENT);
- }
- }
-
- // 这啥语义啊??
- fn readlink(&mut self, req: &Request<'_>, ino: u64, reply: ReplyData) {
- debug!("readlink(ino: {})", ino);
- if let Some(inode) = self.get_inode(ino as usize) {
- if !inode.is_symlink() {
- reply.error(ENOENT);
- return;
- }
- if !check_access(req.uid(), req.gid(), inode.uid, inode.gid, inode.mode, R_OK) {
- reply.error(EACCES);
- return;
- }
- let path_length = inode.size as usize;
- let mut path = vec![0u8; path_length];
- if path_length < 60 {
- debug!(
- "symlink path length is {}, reading directly from inode.direct",
- path_length
- );
- let copy_src = unsafe {
- let src = (&inode.direct) as *const u32 as *const u8;
- slice::from_raw_parts(src, path_length)
- };
- path.as_mut_slice().copy_from_slice(copy_src);
- } else {
- debug!(
- "symlink path length is {}, using original read",
- path_length
- );
- let inode = inode.clone();
- let mut read_ptr = 0usize;
- while read_ptr < path_length {
- let block_index = read_ptr / BLOCK_SIZE;
- let offset = read_ptr % BLOCK_SIZE;
-
- let read_length_within_block = if BLOCK_SIZE - offset < path_length - read_ptr {
- BLOCK_SIZE - offset
- } else {
- path_length - read_ptr
- };
-
- if let Some(block) = self.access_block::<DataBlock>(&inode, block_index) {
- (&mut path[read_ptr..read_ptr + read_length_within_block]).copy_from_slice(
- &block.block.0[offset..offset + read_length_within_block],
- );
- read_ptr += read_length_within_block;
- } else {
- reply.error(EIO);
- return;
- }
- }
- }
- debug!(
- "readlink path read is {:?}",
- OsStr::from_bytes(path.as_slice())
- );
- reply.data(path.as_slice());
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn mknod(
- &mut self,
- req: &Request<'_>,
- parent: u64,
- name: &OsStr,
- mode: u32,
- _umask: u32, // umask 是用不到的
- _rdev: u32, // the device number (only valid if created file is a device)
- reply: ReplyEntry,
- ) {
- debug!(
- "mknod(parent: {}, name: {:?}, mode: {}, umask: {})",
- parent, name, mode, _umask
- );
-
- let parent = parent as usize;
- if let Some(parent_inode) = self.get_inode(parent) {
- if !check_access(
- req.uid(),
- req.gid(),
- parent_inode.uid,
- parent_inode.gid,
- parent_inode.mode,
- W_OK,
- ) {
- reply.error(EACCES);
- return;
- }
-
- // parent 不是 IFDIR -> Not a directory
- if !parent_inode.is_dir() {
- reply.error(ENOTDIR);
- return;
- }
-
- // 文件名长度超过 255, 返回 filename too long
- if name.len() > 255 {
- reply.error(ENAMETOOLONG);
- return;
- }
-
- let mut parent_inode = parent_inode.clone();
- // 如果已经存在, 返回 already exists
- if self.lookup_name(parent, &parent_inode, name).is_ok() {
- reply.error(EEXIST);
- return;
- }
-
- let mode = mode as u16;
- if let Some((child_inode_index, child_inode)) =
- self.create_file(mode, req.uid(), req.gid(), 0)
- {
- let mode = child_inode.mode;
- let file_attr = to_fileattr(child_inode_index, child_inode);
- if let Err(err_code) = self.add_direntry(
- parent,
- &mut parent_inode,
- child_inode_index,
- name,
- mode.into(),
- ) {
- reply.error(err_code);
- return;
- }
- self.update_inode(parent, parent_inode); // 前面 clone 了, 这里写回
- reply.entry(&TTL, &file_attr, 0);
- } else {
- // create_inode 失败 -> no enough space
- reply.error(ENOSPC);
- }
- } else {
- // parent 不存在 -> No such file or directory
- reply.error(ENOENT);
- }
- }
-
- fn mkdir(
- &mut self,
- req: &Request<'_>,
- parent: u64,
- name: &OsStr,
- mode: u32,
- _umask: u32, // umask 应该也是用不到的
- reply: ReplyEntry,
- ) {
- if let Some(parent_inode) = self.get_inode(parent as usize) {
- // 无权限创建 -> EACCES
- if !check_access(
- req.uid(),
- req.gid(),
- parent_inode.uid,
- parent_inode.gid,
- parent_inode.mode,
- W_OK,
- ) {
- reply.error(EACCES);
- return;
- }
-
- // parent 不是 IFDIR -> Not a directory
- if !parent_inode.is_dir() {
- reply.error(ENOTDIR);
- return;
- }
-
- // 文件名长度超过 255 -> filename too long
- if name.len() > 255 {
- reply.error(ENAMETOOLONG);
- return;
- }
-
- let mut parent_inode = parent_inode.clone();
- // 已经存在 -> File exists
- if self
- .lookup_name(parent as usize, &parent_inode, name)
- .is_ok()
- {
- reply.error(EEXIST);
- return;
- }
-
- let mode = mode as u16;
- if let Some((child_inode_index, child_inode)) =
- self.create_directory(mode, req.uid(), req.gid(), 0, Some(parent as usize))
- {
- let child_inode = child_inode.clone();
- let file_attr = to_fileattr(child_inode_index, &child_inode);
- if let Err(err_code) = self.add_direntry(
- parent as usize,
- &mut parent_inode,
- child_inode_index,
- name,
- child_inode.mode.into(),
- ) {
- reply.error(err_code);
- return;
- }
- self.update_inode(parent as usize, parent_inode); // 前面 clone 了, 这里写回
- reply.entry(&TTL, &file_attr, 0);
- } else {
- // create_inode 失败 -> no enough space
- reply.error(ENOSPC);
- }
- } else {
- // parent 不存在 -> No such file or directory
- reply.error(ENOENT);
- }
- }
-
- fn unlink(&mut self, req: &Request<'_>, parent: u64, name: &OsStr, reply: ReplyEmpty) {
- debug!("unlink(parent: {:#x?}, name: {:?})", parent, name,);
- if let Some(parent_inode) = self.get_inode(parent as usize) {
- // 无权限删除 -> EACCES
- if !check_access(
- req.uid(),
- req.gid(),
- parent_inode.uid,
- parent_inode.gid,
- parent_inode.mode,
- W_OK,
- ) {
- reply.error(EACCES);
- return;
- }
-
- // parent 不是 dir -> ENOTDIR
- if !parent_inode.is_dir() {
- reply.error(ENOTDIR);
- return;
- }
-
- // 文件名长度超过 255 -> filename too long
- if name.len() > 255 {
- reply.error(ENAMETOOLONG);
- return;
- }
-
- let mut parent_inode = parent_inode.clone();
- // 不存在 -> No such file or directory
- if let Ok((inode_index, entry_index, mut inode)) =
- self.lookup_name(parent as usize, &parent_inode, name)
- {
- let inode_index = inode_index as usize;
-
- match inode.file_type() {
- FileType::RegularFile => {
- inode.n_links -= 1;
- if inode.n_links == 0 {
- // n_links == 0 -> 整个 inode 都要删除掉
- match self.remove_file(inode_index) {
- Ok(flag) => debug!(" unlink {}", flag),
- Err(err_code) => {
- reply.error(err_code);
- return;
- }
- }
- } else {
- // n_links > 0 -> 只是移除了一个 hard link, 将改动写回
- self.update_inode(inode_index, inode);
- }
- }
- FileType::Symlink => {}
- FileType::Directory => {
- reply.error(EISDIR);
- return;
- }
- _ => {
- // Not implemented!
- reply.error(EIO);
- return;
- }
- }
-
- // 删除 dir entry
- if let Err(err_code) =
- self.remove_direntry(parent as usize, &mut parent_inode, name, entry_index)
- {
- reply.error(err_code);
- return;
- }
- reply.ok();
- } else {
- reply.error(ENOENT);
- }
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn rmdir(&mut self, req: &Request<'_>, parent: u64, name: &OsStr, reply: ReplyEmpty) {
- debug!("rmdir(parent: {:#x?}, name: {:?}", parent, name,);
- if let Some(parent_inode) = self.get_inode(parent as usize) {
- // 无权限删除 -> EACCES
- if !check_access(
- req.uid(),
- req.gid(),
- parent_inode.uid,
- parent_inode.gid,
- parent_inode.mode,
- W_OK,
- ) {
- reply.error(EACCES);
- return;
- }
-
- // parent 不是 dir -> ENOTDIR
- if !parent_inode.is_dir() {
- reply.error(ENOTDIR);
- return;
- }
-
- // 文件名长度超过 255 -> filename too long
- if name.len() > 255 {
- reply.error(ENAMETOOLONG);
- return;
- }
-
- let mut parent_inode = parent_inode.clone();
- // 不存在 -> No such file or directory
- if let Ok((inode_index, entry_index, inode)) =
- self.lookup_name(parent as usize, &parent_inode, name)
- {
- let inode_index = inode_index as usize;
- // 要删除的 entry 是一般文件, 不用 rmdir
- if inode.is_file() {
- reply.error(ENOTDIR);
- return;
- }
-
- // 一定有 . 和 .. 所以 size == 2 就是空目录
- // 目录非空 -> ENOTEMPTY
- if inode.size > 2 {
- reply.error(ENOTEMPTY);
- return;
- }
-
- // directory 没有 hard link, 删了就是删了
- match self.remove_dir(inode_index) {
- Ok(flag) => debug!(" rmdir {}", flag),
- Err(err_code) => {
- reply.error(err_code);
- return;
- }
- }
-
- // 删除 dir entry
- if let Err(err_code) =
- self.remove_direntry(parent as usize, &mut parent_inode, name, entry_index)
- {
- reply.error(err_code);
- return;
- }
-
- reply.ok();
- } else {
- reply.error(ENOENT);
- }
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn symlink(
- &mut self,
- req: &Request<'_>,
- parent: u64,
- link_name: &OsStr,
- target: &Path,
- reply: ReplyEntry,
- ) {
- debug!(
- "symlink(parent: {}, name: {:?}, target: {:?})",
- parent, link_name, target
- );
- let parent = parent as usize;
-
- // let root_inode_index = 1usize;
- // if let Some(root_inode) = self.get_inode(root_inode_index) {
- // let mut curr_inode_index = root_inode_index;
- // let mut curr_inode = root_inode.clone();
- // for segment in target.iter() {
- // match self.lookup_name(curr_inode_index, &curr_inode, segment) {
- // Ok((next_inode_index, _, next_inode)) => {
- // curr_inode_index = next_inode_index as usize;
- // curr_inode = next_inode;
- // }
- // Err(err_code) => {
- // reply.error(err_code);
- // return;
- // }
- // }
- // }
- // } else {
- // reply.error(EIO);
- // return;
- // }
-
- if let Some(parent_inode) = self.get_inode(parent) {
- if !check_access(
- req.uid(),
- req.gid(),
- parent_inode.uid,
- parent_inode.gid,
- parent_inode.mode,
- W_OK,
- ) {
- reply.error(EACCES);
- return;
- }
-
- if !parent_inode.is_dir() {
- reply.error(ENOTDIR);
- return;
- }
-
- if link_name.len() > 255 {
- reply.error(ENAMETOOLONG);
- return;
- }
-
- let target = target.as_os_str();
- let mut parent_inode = parent_inode.clone();
- if self.lookup_name(parent, &parent_inode, link_name).is_ok() {
- reply.error(EEXIST);
- return;
- }
-
- if let Some((child_inode_index, child_inode)) =
- self.create_symlink(0o777, req.uid(), req.gid(), 0)
- {
- let mut child_inode = child_inode.clone();
- child_inode.size = target.len() as u32;
- if target.len() < 60 {
- debug!("create_symlink: target length < 60, allocating in 'direct' section.");
- let target_path = target.as_bytes();
- let copy_dst = unsafe {
- let dst = (&mut child_inode.direct) as *mut u32 as *mut u8;
- slice::from_raw_parts_mut(dst, target_path.len())
- };
- copy_dst.copy_from_slice(target_path);
- } else {
- debug!("create_symlink: target length >= 60, using original layout.");
- let mut write_ptr = 0usize;
- while write_ptr < target.len() {
- let block_index = write_ptr / BLOCK_SIZE;
- let offset = write_ptr % BLOCK_SIZE;
-
- let write_length_within_block =
- if BLOCK_SIZE - offset < target.len() - write_ptr {
- BLOCK_SIZE - offset
- } else {
- target.len() - write_ptr
- };
-
- if let Some(block) =
- self.access_block_mut::<DataBlock>(&child_inode, block_index)
- {
- block.block.0[offset..offset + write_length_within_block]
- .copy_from_slice(
- &target.as_bytes()
- [write_ptr..write_ptr + write_length_within_block],
- );
- write_ptr += write_length_within_block;
- } else {
- if let Some((_block_index, block_index_within_inode)) =
- self.allocate_block_for(&mut child_inode)
- {
- let block = self
- .access_block_mut::<DataBlock>(
- &child_inode,
- block_index_within_inode,
- )
- .unwrap();
- block.block.0[offset..offset + write_length_within_block]
- .copy_from_slice(
- &target.as_bytes()
- [write_ptr..write_ptr + write_length_within_block],
- );
- write_ptr += write_length_within_block;
- } else {
- reply.error(ENOSPC);
- return;
- }
- }
- }
- }
-
- let file_attr = to_fileattr(child_inode_index, &child_inode);
- self.update_inode(child_inode_index, child_inode);
-
- if let Err(err_code) = self.add_direntry(
- parent,
- &mut parent_inode,
- child_inode_index,
- link_name,
- from_filetype(FileType::Symlink),
- ) {
- reply.error(err_code);
- return;
- }
- self.update_inode(parent, parent_inode);
- reply.entry(&TTL, &file_attr, 0);
- } else {
- reply.error(ENOSPC);
- }
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn rename(
- &mut self,
- req: &Request<'_>,
- parent: u64,
- name: &OsStr,
- new_parent: u64,
- new_name: &OsStr,
- flags: u32,
- reply: ReplyEmpty,
- ) {
- debug!(
- "rename(parent: {}, name: {:?}, new_parent: {}, new_name: {:?})",
- parent, name, new_parent, new_name
- );
-
- let parent = parent as usize;
- let new_parent = new_parent as usize;
- if let Some(parent_inode) = self.get_inode(parent) {
- if !check_access(
- req.uid(),
- req.gid(),
- parent_inode.uid,
- parent_inode.gid,
- parent_inode.mode,
- R_OK,
- ) {
- reply.error(EACCES);
- return;
- }
-
- if name.len() > 255 {
- reply.error(ENAMETOOLONG);
- return;
- }
-
- let mut parent_inode = parent_inode.clone();
- match self.lookup_name(parent, &parent_inode, name) {
- Ok((inode_index, entry_index, inode)) => {
- if let Some(new_parent_inode) = self.get_inode(new_parent) {
- if !check_access(
- req.uid(),
- req.gid(),
- new_parent_inode.uid,
- new_parent_inode.gid,
- new_parent_inode.mode,
- W_OK,
- ) {
- reply.error(EACCES);
- return;
- }
- if new_name.len() > 255 {
- reply.error(ENAMETOOLONG);
- return;
- }
-
- let mut new_parent_inode = new_parent_inode.clone();
- match self.lookup_name(new_parent, &new_parent_inode, new_name) {
- Ok((new_inode_index, new_entry_index, new_inode)) => {
- // 新文件存在
- if flags & RENAME_NOREPLACE != 0 { // 指定 noreplace 之后不允许覆盖文件
- reply.error(EEXIST);
- return;
- }
- if flags & RENAME_EXCHANGE != 0 { // 交换两个文件
- if let Err(err_code) = self.exchange_direntry(
- parent,
- &mut parent_inode,
- name,
- new_parent,
- &mut new_parent_inode,
- new_name
- ) {
- reply.error(err_code);
- return;
- }
- } else { // 用新文件替换旧文件
- let dir_entry = self.get_direntry_by_name(parent, &parent_inode, name)
- .unwrap();
- if let Err(err_code) = self.remove_direntry(parent, &mut parent_inode, name, entry_index) {
- reply.error(err_code);
- return;
- }
- if let Err(err_code) = self.remove_direntry(new_parent, &mut new_parent_inode, new_name, new_entry_index) {
- reply.error(err_code);
- return;
- }
- if let Err(err_code) = self.add_direntry_2(new_parent, &mut new_parent_inode, new_name, dir_entry) {
- reply.error(err_code);
- return;
- }
- }
- reply.ok();
- },
- Err(ENOENT) => { // 新文件不存在, 删除旧的创建新的
- let dir_entry = self.get_direntry_by_name(parent, &parent_inode, name)
- .unwrap();
- if let Err(err_code) = self.remove_direntry(parent, &mut parent_inode, name, entry_index) {
- reply.error(err_code);
- return;
- }
- if let Err(err_code) = self.add_direntry_2(new_parent, &mut new_parent_inode, new_name, dir_entry) {
- reply.error(err_code);
- return;
- }
- reply.ok();
- },
- Err(err_code) => {
- // 其他 Err code
- reply.error(err_code);
- return;
- }
- }
- } else {
- reply.error(ENOENT);
- }
- },
- Err(err_code) => {
- reply.error(err_code);
- return;
- }
- }
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn open(&mut self, req: &Request<'_>, ino: u64, flags: i32, reply: ReplyOpen) {
- debug!("open(ino: {:#x?}, flags: {:#x?})", ino, flags);
- let (access_mask, read, write) = match flags & O_ACCMODE {
- O_RDONLY => {
- // Behavior is undefined, but most filesystems return EACCES
- if flags & libc::O_TRUNC != 0 {
- reply.error(EACCES);
- return;
- }
- (R_OK, true, false)
- }
- O_WRONLY => (W_OK, false, true),
- O_RDWR => (R_OK | W_OK, true, true),
- _ => {
- // flag 非法
- reply.error(EINVAL);
- return;
- }
- };
-
- match self.get_inode(ino as usize) {
- Some(inode) => {
- if !check_access(
- req.uid(),
- req.gid(),
- inode.uid,
- inode.gid,
- inode.mode,
- access_mask,
- ) {
- reply.error(EACCES);
- return;
- }
- let fd = self.allocate_file_descriptor(ino as usize, read, write);
- reply.opened(fd, 0);
- }
- None => {
- reply.error(ENOENT);
- }
- }
- }
-
- // read [offset, offset + size)
- // - EOF < offset + size -> return EOF - offset
- // - EOF > offset + size -> return size
- fn read(
- &mut self,
- req: &Request<'_>,
- ino: u64,
- fh: u64,
- offset: i64,
- size: u32,
- _flags: i32,
- _lock_owner: Option<u64>, // 用不到!
- reply: ReplyData,
- ) {
- assert_eq!(self.file_handle_map.get(&fh).unwrap().0, ino as usize);
- if let Some(inode) = self.get_inode(ino as usize) {
- if inode.is_dir() {
- reply.error(EISDIR);
- return;
- }
- if !check_access(req.uid(), req.gid(), inode.uid, inode.gid, inode.mode, R_OK) {
- reply.error(EACCES);
- return;
- }
- debug!("reading inode {:#x} (offset {} size {})", ino, offset, size);
-
- if offset as u32 >= inode.size {
- // offset 在 EOF 后面, 直接返回一个 0 长度的空 buffer
- reply.data(&Vec::new());
- return;
- }
-
- // let read_length = size.min(inode.size.saturating_sub(offset as u32)) as usize;
- // 这和下面那个是等同的但是不利于让人看懂……
- let read_length = if offset as u32 + size <= inode.size {
- size // 没有越过 EOF, 读取 size 个 byte
- } else {
- inode.size - offset as u32 // 越过了 EOF, 读取 inode.size - offset 个 byte
- } as usize;
-
- let mut read_buffer = vec![0u8; read_length];
- let mut read_ptr = 0usize;
-
- let inode = inode.clone();
-
- while read_ptr < read_length {
- let current_point = offset as usize + read_ptr;
- let current_block_index = current_point / BLOCK_SIZE;
- let current_offset = current_point % BLOCK_SIZE;
-
- let read_length_within_block =
- if BLOCK_SIZE - current_offset < read_length - read_ptr {
- BLOCK_SIZE - current_offset // 可以读到 block 最后
- } else {
- read_length - read_ptr // 读到中途会停下来
- };
-
- if let Some(block) = self.access_block::<DataBlock>(&inode, current_block_index) {
- (&mut read_buffer[read_ptr..read_ptr + read_length_within_block])
- .copy_from_slice(
- &block.block.0
- [current_offset..current_offset + read_length_within_block],
- );
- read_ptr += read_length_within_block;
- } else {
- reply.error(EIO);
- return;
- }
- }
-
- reply.data(&read_buffer);
- }
- }
-
- // 写了多少就返回多少
- fn write(
- &mut self,
- req: &Request<'_>,
- ino: u64,
- fh: u64,
- offset: i64,
- data: &[u8],
- _write_flags: u32,
- _flags: i32,
- _lock_owner: Option<u64>,
- reply: ReplyWrite,
- ) {
- assert_eq!(self.file_handle_map.get(&fh).unwrap().0, ino as usize);
- if let Some(inode) = self.get_inode(ino as usize) {
- if inode.is_dir() {
- reply.error(EISDIR);
- return;
- }
- if !check_access(req.uid(), req.gid(), inode.uid, inode.gid, inode.mode, W_OK) {
- reply.error(EACCES);
- return;
- }
- debug!(
- "writing inode {:#x} (offset {} size {})",
- ino,
- offset,
- data.len()
- );
- let write_length = data.len();
- let mut write_ptr = 0usize;
-
- let mut inode = inode.clone();
-
- while write_ptr < write_length {
- let current_point = offset as usize + write_ptr;
- let current_block_index = current_point / BLOCK_SIZE;
- let current_offset = current_point % BLOCK_SIZE;
-
- let write_length_within_block =
- if BLOCK_SIZE - current_offset < write_length - write_ptr {
- BLOCK_SIZE - current_offset // 可以写满 block
- } else {
- write_length - write_ptr // 写完 buffer 就停下来
- };
-
- // 当前块已分配, 直接往里写
- if let Some(block) = self.access_block_mut::<DataBlock>(&inode, current_block_index)
- {
- debug!(
- "writing {} bytes in block {} within inode",
- write_length_within_block, current_block_index
- );
- (block.block.0[current_offset..current_offset + write_length_within_block])
- .copy_from_slice(&data[write_ptr..write_ptr + write_length_within_block]);
- write_ptr += write_length_within_block;
- } else {
- // 当前块未分配，尝试分配
- if let Some((block_index, block_index_within_inode)) =
- self.allocate_block_for(&mut inode)
- {
- debug!("writing {} bytes in allocated block {} within inode, block index is {}", write_length_within_block, block_index_within_inode, block_index);
- // 能分配, 往里写
- let block = self
- .access_block_mut::<DataBlock>(&inode, block_index_within_inode)
- .unwrap();
- (block.block.0[current_offset..current_offset + write_length_within_block])
- .copy_from_slice(
- &data[write_ptr..write_ptr + write_length_within_block],
- );
- write_ptr += write_length_within_block;
- } else {
- // 分配不了, 没空间了
- break;
- }
- }
- }
-
- inode.size = inode.size.max(offset as u32 + write_length as u32);
- self.update_inode(ino as usize, inode);
- reply.written(write_length as u32);
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn release(
- &mut self,
- _req: &Request<'_>,
- ino: u64,
- fh: u64,
- _flags: i32,
- _lock_owner: Option<u64>,
- _flush: bool,
- reply: ReplyEmpty,
- ) {
- debug!("release(ino: {:#x?}, fh: {}", ino, fh);
- if self.file_handle_map.contains_key(&fh) {
- self.file_handle_map.remove(&fh);
- reply.ok();
- } else {
- reply.error(EBADF);
- }
- }
-
- fn opendir(&mut self, req: &Request<'_>, ino: u64, flags: i32, reply: ReplyOpen) {
- debug!("opendir(ino: {:#x?}, flags: {:#x?})", ino, flags);
- let (access_mask, read, write) = match flags & O_ACCMODE {
- O_RDONLY => {
- // Behavior is undefined, but most filesystems return EACCES
- if flags & libc::O_TRUNC != 0 {
- reply.error(EACCES);
- return;
- }
- (R_OK, true, false)
- }
- O_WRONLY => (W_OK, false, true),
- O_RDWR => (R_OK | W_OK, true, true),
- _ => {
- // flag 非法
- reply.error(EINVAL);
- return;
- }
- };
-
- match self.get_inode(ino as usize) {
- Some(inode) => {
- if !check_access(
- req.uid(),
- req.gid(),
- inode.uid,
- inode.gid,
- inode.mode,
- access_mask,
- ) {
- reply.error(EACCES);
- return;
- }
- let fd = self.allocate_file_descriptor(ino as usize, read, write);
- reply.opened(fd, 0);
- }
- None => {
- reply.error(ENOENT);
- }
- }
- }
-
- fn readdir(
- &mut self,
- req: &Request<'_>,
- ino: u64,
- fh: u64, // 如果 invoke 它的 opendir 里有指定 fh, 那么这里会收到 fh 参数
- offset: i64,
- mut reply: ReplyDirectory,
- ) {
- assert_eq!(self.file_handle_map.get(&fh).unwrap().0, ino as usize);
- if let Some(inode) = self.get_inode(ino as usize) {
- if !inode.is_dir() {
- reply.error(ENOTDIR);
- return;
- }
-
- if !check_access(req.uid(), req.gid(), inode.uid, inode.gid, inode.mode, R_OK) {
- reply.error(EACCES);
- return;
- }
-
- debug!(
- "reading dir entries from inode {:#x} with offset {}",
- ino, offset
- );
- let inode = inode.clone();
-
- self.load_direntry_map(ino as usize, &inode).unwrap();
- for (entry_index, (name, dir_entry)) in self
- .dir_entry_map
- .get(&(ino as usize))
- .unwrap()
- .iter()
- .enumerate()
- .skip(offset as usize)
- {
- debug!(
- " entry {} from inode {:#x} with name {:?}",
- entry_index, dir_entry.inode, name
- );
- if reply.add(
- dir_entry.inode as u64,
- entry_index as i64 + 1,
- to_filetype(dir_entry.file_type).expect("not 0x0!"),
- name,
- ) {
- break;
- }
- }
-
- reply.ok();
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn releasedir(
- &mut self,
- _req: &Request<'_>,
- ino: u64,
- fh: u64,
- _flags: i32,
- reply: ReplyEmpty,
- ) {
- debug!("releasedir(ino: {:#x?}, fh: {}", ino, fh);
- if self.file_handle_map.contains_key(&fh) {
- self.file_handle_map.remove(&fh);
- reply.ok();
- } else {
- reply.error(EBADF);
- }
- }
-
- fn access(&mut self, req: &Request<'_>, ino: u64, mask: i32, reply: ReplyEmpty) {
- // mask:
- // - 要么是 libc::F_OK (aka 0), 检查文件是否存在
- // - 要么是 libc::R_OK,libc::W_OK,libc::X_OK (aka 4/2/1) 构成的 bitmask, 检查是否有对应权限
- debug!("Filesystem::access(ino: {}, mask: {})", ino, mask);
-
- if let Some(inode) = self.get_inode(ino as usize) {
- if mask == libc::F_OK // 只要检查是否存在
- || check_access(req.uid(), req.gid(), inode.uid, inode.gid, inode.mode, mask)
- // 需要检查 rwx 权限
- {
- reply.ok();
- } else {
- reply.error(EACCES);
- }
- } else {
- reply.error(ENOENT);
- }
- }
-}
diff --git a/ayafs/src/main.rs b/ayafs/src/main.rs
deleted file mode 100644
index db4a017..0000000
--- a/ayafs/src/main.rs
+++ /dev/null
@@ -1,171 +0,0 @@
-mod block_device;
-mod disk;
-mod filesystem;
-mod memory;
-mod tests;
-mod utils;
-
-use clap::Parser;
-use fuser::MountOption;
-use indexmap::IndexMap;
-use log::{debug, LevelFilter};
-use lru::LruCache;
-use std::collections::HashMap;
-use std::ffi::OsString;
-use std::num::NonZeroUsize;
-use std::path::PathBuf;
-use std::sync::atomic::AtomicU64;
-use std::sync::Arc;
-use std::time::Duration;
-
-use crate::disk::block::{DirectoryEntry, InodeBlock};
-use crate::memory::cached_block::BlockCache;
-use block_device::{memory_disk::MemoryDisk, BlockDevice, BLOCK_SIZE};
-use disk::bitmap::Bitmap;
-use disk::block::DataBlock;
-use disk::inode::INODE_SIZE;
-use users::{get_current_gid, get_current_uid};
-use crate::block_device::disk::Disk;
-
-#[derive(Parser, Debug)]
-#[command(author, version, about)]
-struct Args {
- mount_point: Option<String>,
- #[arg(short, action = clap::ArgAction::Count)]
- verbosity: u8,
- #[arg(long)]
- auto_unmount: bool,
- #[arg(long)]
- allow_root: bool,
-}
-
-const TTL: Duration = Duration::new(0, 0);
-const INODE_PER_BLOCK: usize = BLOCK_SIZE / INODE_SIZE;
-
-/// The design of MyFS is rather simple:
-/// +-------------------+
-/// | Super Block |
-/// +-------------------+
-/// | Inode Bitmap |
-/// +-------------------+
-/// | ... |
-/// +-------------------+
-/// | Data Block Bitmap |
-/// +-------------------+
-/// | ... |
-/// +-------------------+
-/// | Inode Block |
-/// +-------------------+
-/// | ... |
-/// +-------------------+
-/// | Data Block |
-/// +-------------------+
-/// With each block 4KiB, each Inode entry 128B
-
-#[repr(C)]
-struct AyaFS {
- device: Arc<dyn BlockDevice>,
- data_bitmap: Bitmap,
- inode_bitmap: Bitmap,
- inode_start_block: usize,
- data_start_block: usize,
-
- next_file_handle: AtomicU64,
- // file descriptor -> (inode index, read, write)
- file_handle_map: HashMap<u64, (usize, bool, bool)>,
-
- // inode index -> (index aware) hashmap that maps dir entry name to inode index
- dir_entry_map: LruCache<usize, IndexMap<OsString, DirectoryEntry>>,
-
- cached_inodes: BlockCache<InodeBlock>,
- cached_blocks: BlockCache<DataBlock>,
-}
-
-impl AyaFS {
- fn new(device: Arc<dyn BlockDevice>, total_block_number: usize) -> Self {
- let max_inode_number: usize = 16384; // TODO: remove hard-coded magic number
- let inode_block_number = max_inode_number / INODE_PER_BLOCK; // == 128
- let inode_bitmap_block_number = (inode_block_number + BLOCK_SIZE - 1) / BLOCK_SIZE;
-
- let blocks_remaining =
- total_block_number - inode_block_number - inode_bitmap_block_number - 1;
- // let number of data blocks be x, the remaining block number be C,
- // the corresponding data bitmap length should be ceil(x / BLK_SIZE),
- // thus we have BLK_SIZE * (C-1) / (BLK_SIZE+1) <= x <= BLK_SIZE * C / (BLK_SIZE+1)
- // the difference of the two bounds is less than 1,
- // meaning only 1 integer could be in between.
- // Thus we have x = floor(BLK_SIZE * C / (BLK_SIZE + 1))
- let data_block_number = BLOCK_SIZE * blocks_remaining / (BLOCK_SIZE + 1);
- let data_bitmap_block_number = blocks_remaining - data_block_number;
- debug!("data_bitmap_block_number: {}", data_bitmap_block_number);
- debug!("inode_bitmap_block_number: {}", inode_bitmap_block_number);
- debug!("inode_block_number: {}", inode_block_number);
- debug!("data_block_number: {}", data_block_number);
- debug!(
- "sum: {}",
- 1 + data_bitmap_block_number
- + inode_bitmap_block_number
- + inode_block_number
- + data_block_number
- );
-
- let mut data_bitmap = Bitmap::new(1, data_bitmap_block_number, device.clone());
- let _ = data_bitmap.allocate().unwrap(); // data block 0 is not usable
- let mut inode_bitmap = Bitmap::new(
- data_bitmap_block_number + 1,
- inode_bitmap_block_number,
- device.clone(),
- );
- let _ = inode_bitmap.allocate().unwrap(); // inode block 0 is not usable
-
- let mut fs = Self {
- device: device.clone(),
- data_bitmap,
- inode_bitmap,
- inode_start_block: data_bitmap_block_number + inode_bitmap_block_number + 1,
- data_start_block: data_bitmap_block_number
- + inode_bitmap_block_number
- + inode_block_number
- + 1,
-
- next_file_handle: AtomicU64::new(3), // 0,1,2 are stdin, stdout and stderr
- file_handle_map: HashMap::new(),
-
- dir_entry_map: LruCache::new(NonZeroUsize::new(1024).unwrap()),
-
- cached_inodes: BlockCache::new(device.clone(), 1024),
- cached_blocks: BlockCache::new(device.clone(), 8192),
- };
-
- fs.create_directory(0o755, get_current_uid(), get_current_gid(), 0, None);
-
- fs
- }
-}
-
-fn main() {
- let args = Args::parse();
- let mount_point = args.mount_point.unwrap();
- let verbosity = args.verbosity;
- let log_level = match verbosity {
- 0 => LevelFilter::Error,
- 1 => LevelFilter::Warn,
- 2 => LevelFilter::Info,
- 3 => LevelFilter::Debug,
- _ => LevelFilter::Trace,
- };
- env_logger::builder()
- .filter_level(log_level)
- .init();
- let options = vec![
- // MountOption::RO,
- MountOption::FSName("hello".to_string()),
- MountOption::AutoUnmount,
- MountOption::AllowRoot,
- ];
- let disk = Arc::new(Disk::new(PathBuf::from("/dev/nvme0n1p4")));
- // let disk = Arc::new(MemoryDisk::new(16384));
- let filesystem = AyaFS::new(disk, 7864320);
-
- fuser::mount2(filesystem, mount_point, &options).unwrap();
-}
diff --git a/ayafs/src/memory/cached_block.rs b/ayafs/src/memory/cached_block.rs
deleted file mode 100644
index c3d0338..0000000
--- a/ayafs/src/memory/cached_block.rs
+++ /dev/null
@@ -1,180 +0,0 @@
-use crate::block_device::{BlockDevice, BLOCK_SIZE};
-use crate::disk::block::Block;
-use crate::AyaFS;
-use lru::LruCache;
-use std::num::NonZeroUsize;
-use std::sync::Arc;
-
-#[derive(Clone)]
-pub struct CachedBlock<T: Block> {
- pub block: T,
- pub index: usize,
- pub dirty: bool,
-}
-
-pub fn convert_mut<U: Block, T: Block>(input_block: &mut CachedBlock<U>) -> &mut CachedBlock<T> {
- let ptr = input_block as *const CachedBlock<U> as *mut u8;
- let block = ptr.cast::<CachedBlock<T>>();
- unsafe { &mut *block }
-}
-
-pub fn convert<U: Block, T: Block>(input_block: &CachedBlock<U>) -> &CachedBlock<T> {
- let ptr = input_block as *const CachedBlock<U> as *mut u8;
- let block = ptr.cast::<CachedBlock<T>>();
- unsafe { &*block }
-}
-
-pub(crate) struct BlockCache<T: Block> {
- device: Arc<dyn BlockDevice>,
- cache: LruCache<usize, CachedBlock<T>>,
-}
-
-impl<T: Block> BlockCache<T> {
- pub(crate) fn new(device: Arc<dyn BlockDevice>, cache_size: usize) -> Self {
- Self {
- device,
- cache: LruCache::new(NonZeroUsize::new(cache_size).unwrap()),
- }
- }
-
- pub(crate) fn load_block(&mut self, index: usize) -> bool {
- if self.cache.contains(&index) == false {
- let mut buffer = [0u8; BLOCK_SIZE];
- self.device.read(index, &mut buffer);
- let block: T = unsafe { std::mem::transmute_copy(&buffer) };
- let cached_block = CachedBlock {
- block,
- index,
- dirty: false,
- };
- if let Some((old_index, old_block)) = self.cache.push(index, cached_block) {
- assert_ne!(old_index, index); // 只有 block 不在 cache 里的时候才会插入
- if old_block.dirty {
- let old_block_ptr = &old_block.block as *const T as *mut u8;
- let old_block_buffer =
- unsafe { std::slice::from_raw_parts(old_block_ptr, BLOCK_SIZE) };
- self.device.write(old_index, old_block_buffer);
- }
- }
- }
- true
- }
-
- /// 从 LRU cache 里获取一个 block 的引用, 如果没有在 cache 中会加载.
- /// 这个函数不应该返回 None
- pub(crate) fn get_block<U: Block>(&mut self, index: usize) -> Option<&CachedBlock<U>> {
- if !self.cache.contains(&index) {
- self.load_block(index);
- }
- self.cache.get(&index).map(convert::<T, U>)
- }
-
- /// 从 LRU cache 里获取一个 block 的可变引用, 如果没有在 cache 中会加载.
- /// 这个函数不应该返回 None
- pub(crate) fn get_block_mut<U: Block>(&mut self, index: usize) -> Option<&mut CachedBlock<U>> {
- if !self.cache.contains(&index) {
- self.load_block(index);
- }
- self.cache.get_mut(&index).map(|block| {
- block.dirty = true;
- convert_mut::<T, U>(block)
- })
- }
-
- /// 向 LRU cache 中插入一个全新初始化的 block
- /// 这个 block 全 0, 而且是 dirty 的, 即使被挤出去也会触发一次落盘
- pub(crate) fn init_block(&mut self, index: usize) {
- let allocated_block = CachedBlock {
- block: T::default(),
- index,
- dirty: true,
- };
- if let Some((old_index, old_block)) = self.cache.push(index, allocated_block) {
- if old_block.dirty {
- let old_block_ptr = &old_block.block as *const T as *mut u8;
- let old_block_buffer =
- unsafe { std::slice::from_raw_parts(old_block_ptr, BLOCK_SIZE) };
- self.device.write(old_index, old_block_buffer);
- }
- }
- }
-
- #[allow(unused)]
- /// 从 LRU cache 中读取一个 block 的引用, *不会* 影响 LRU cache 的结构, 如果没有在 cache 中不会加载.
- pub(crate) fn peek_block<U: Block>(&self, index: usize) -> Option<&CachedBlock<U>> {
- self.cache.peek(&index).map(convert::<T, U>)
- }
-
- #[allow(unused)]
- /// 从 LRU cache 中读取一个 block 的可变引用, *不会* 影响 LRU cache 的结构, 如果没有在 cache 中不会加载.
- pub(crate) fn peek_block_mut<U: Block>(&mut self, index: usize) -> Option<&mut CachedBlock<U>> {
- self.cache.peek_mut(&index).map(convert_mut::<T, U>)
- }
-
- pub(crate) fn update_block<U: Block>(&mut self, block: CachedBlock<U>) -> bool {
- if self.cache.contains(&block.index) {
- let mut data_block = convert::<U, T>(&block).clone();
- data_block.dirty = true; // TODO 需要把显式写回的都标记为 dirty 吗
- self.cache.push(block.index, data_block);
- true
- } else {
- false
- }
- }
-
- fn pop(&mut self, entry: &usize) -> Option<CachedBlock<T>> {
- self.cache.pop(entry)
- }
-}
-
-impl AyaFS {
- pub(crate) fn init_block(&mut self, index: usize) {
- self.cached_blocks.init_block(index);
- }
-
- pub(crate) fn get_block<T: Block>(&mut self, index: usize) -> Option<&CachedBlock<T>> {
- if self.data_bitmap.query(index) {
- Some(self.cached_blocks.get_block::<T>(index).unwrap())
- } else {
- self.cached_blocks.pop(&index);
- None
- }
- // self.data_bitmap
- // .query(index)
- // .then(|| self.cached_blocks.get_block::<T>(index).unwrap())
- // 返回 None 当且仅当 data_bitmap 中这个 block 为 invalid
- }
-
- pub(crate) fn get_block_mut<T: Block>(&mut self, index: usize) -> Option<&mut CachedBlock<T>> {
- if self.data_bitmap.query(index) {
- Some(self.cached_blocks.get_block_mut::<T>(index).unwrap())
- } else {
- self.cached_blocks.pop(&index);
- None
- }
- // self.data_bitmap
- // .query(index)
- // .then(|| self.cached_blocks.get_block_mut::<T>(index).unwrap())
- // 返回 None 当且仅当 data_bitmap 中这个 block 为 invalid
- }
-
- #[allow(unused)]
- pub(crate) fn peek_block<T: Block>(&self, index: usize) -> Option<&CachedBlock<T>> {
- self.data_bitmap
- .query(index)
- .then(|| self.cached_blocks.peek_block::<T>(index).unwrap())
- // 返回 None 当且仅当 data_bitmap 中这个 block 为 invalid
- }
-
- #[allow(unused)]
- pub(crate) fn peek_block_mut<T: Block>(&mut self, index: usize) -> Option<&mut CachedBlock<T>> {
- self.data_bitmap
- .query(index)
- .then(|| self.cached_blocks.peek_block_mut::<T>(index).unwrap())
- // 返回 None 当且仅当 data_bitmap 中这个 block 为 invalid
- }
-
- pub(crate) fn update_block<T: Block>(&mut self, block: CachedBlock<T>) -> bool {
- self.cached_blocks.update_block(block)
- }
-}
diff --git a/ayafs/src/memory/cached_inode.rs b/ayafs/src/memory/cached_inode.rs
deleted file mode 100644
index 2f26dde..0000000
--- a/ayafs/src/memory/cached_inode.rs
+++ /dev/null
@@ -1,178 +0,0 @@
-use crate::disk::block::InodeBlock;
-use crate::disk::inode::{Inode, INODE_SIZE};
-use crate::{utils, AyaFS};
-use and_then_some::BoolExt;
-use fuser::FileType;
-use libc::{c_int, EIO, EISDIR, ENOENT, ENOTDIR, ENOTEMPTY};
-
-impl AyaFS {
- pub(crate) fn create_file(
- &mut self,
- permissions: u16,
- uid: u32,
- gid: u32,
- flags: u32,
- ) -> Option<(usize, &Inode)> {
- self.inode_bitmap.allocate().map(|inode_index| {
- self.get_inode_mut(inode_index).map(|inode| {
- *inode = Inode::file(permissions, uid, gid, utils::time_now(), flags, 0, 0, 0);
- });
- (inode_index, self.get_inode(inode_index).unwrap())
- })
- }
-
- pub(crate) fn create_symlink(
- &mut self,
- permissions: u16,
- uid: u32,
- gid: u32,
- flags: u32,
- ) -> Option<(usize, &Inode)> {
- self.inode_bitmap.allocate().map(|inode_index| {
- self.get_inode_mut(inode_index).map(|inode| {
- *inode = Inode::symlink(permissions, uid, gid, utils::time_now(), flags, 0, 0, 0);
- });
- (inode_index, self.get_inode(inode_index).unwrap())
- })
- }
-
- /// 根目录的 parent_inode_number 传入 None, 会直接以自己作为 .. 的 inode number
- pub(crate) fn create_directory(
- &mut self,
- permissions: u16,
- uid: u32,
- gid: u32,
- flags: u32,
- parent_inode_number: Option<usize>,
- ) -> Option<(usize, &Inode)> {
- self.inode_bitmap.allocate().map(|inode_index| {
- // 创建 Inode
- let mut new_inode =
- Inode::directory(permissions, uid, gid, utils::time_now(), flags, 0, 0, 0);
- self.init_direntry_map(inode_index);
- self.add_direntry(inode_index, &mut new_inode, inode_index, ".", 0x2)
- .unwrap();
- self.add_direntry(
- inode_index,
- &mut new_inode,
- parent_inode_number.unwrap_or(inode_index),
- "..",
- 0x2,
- )
- .unwrap();
- // 把 inode 放到指定位置
- self.get_inode_mut(inode_index).map(|inode| {
- *inode = new_inode;
- });
-
- (inode_index, self.get_inode(inode_index).unwrap())
- })
- }
-
- pub(crate) fn remove_file(&mut self, inode_index: usize) -> Result<bool, c_int> {
- if self.inode_bitmap.query(inode_index) {
- let (block_index, offset) = self.locate_inode(inode_index);
- if let Some(cached_block) = self.cached_inodes.get_block::<InodeBlock>(block_index) {
- let inode = cached_block.block.inodes[offset / INODE_SIZE].clone();
- match inode.file_type() {
- FileType::RegularFile => self.deallocate_all_blocks_for(&inode).unwrap(),
- FileType::Symlink => {
- if inode.size >= 60 {
- self.deallocate_all_blocks_for(&inode).unwrap();
- }
- }
- FileType::Directory => return Err(EISDIR),
- _ => return Err(EIO),
- }
- }
- self.inode_bitmap.deallocate(inode_index);
- Ok(true)
- } else {
- Err(ENOENT)
- }
- }
-
- // 要删除的 inode 一定得是空的
- pub(crate) fn remove_dir(&mut self, inode_index: usize) -> Result<bool, c_int> {
- if self.inode_bitmap.query(inode_index) {
- let (block_index, offset) = self.locate_inode(inode_index);
- if let Some(cached_block) = self.cached_inodes.get_block::<InodeBlock>(block_index) {
- let inode = &cached_block.block.inodes[offset / INODE_SIZE].clone();
- if !inode.is_dir() {
- // 不是 dir -> ENOTDIR
- return Err(ENOTDIR);
- }
- if inode.size > 2 {
- // 有 . 和 .. 以外的 entry -> ENOTEMPTY
- return Err(ENOTEMPTY);
- }
- // 销毁 inode 里的所有 block
- self.deallocate_all_blocks_for(inode).unwrap();
- }
- // 销毁 inode
- self.inode_bitmap.deallocate(inode_index);
- Ok(true)
- } else {
- Err(ENOENT)
- }
- }
-
- pub(crate) fn update_inode(&mut self, inode_index: usize, inode: Inode) -> bool {
- if self.inode_bitmap.query(inode_index) {
- let (block_index, offset) = self.locate_inode(inode_index);
- if let Some(cached_block) = self.cached_inodes.get_block_mut::<InodeBlock>(block_index)
- {
- cached_block.block.inodes[offset / INODE_SIZE] = inode;
- }
- true
- } else {
- false
- }
- }
-
- pub(crate) fn get_inode(&mut self, inode_index: usize) -> Option<&Inode> {
- self.inode_bitmap.query(inode_index).and_then(|| {
- let (block_index, offset) = self.locate_inode(inode_index);
- // debug!("get_inode(inode_index: {}) -> block_index: {}, offset: {}", inode_index, block_index, offset);
- self.cached_inodes
- .get_block::<InodeBlock>(block_index)
- .map(|cached_block| &cached_block.block.inodes[offset / INODE_SIZE])
- })
- }
-
- pub(crate) fn get_inode_mut(&mut self, inode_index: usize) -> Option<&mut Inode> {
- self.inode_bitmap.query(inode_index).and_then(|| {
- let (block_index, offset) = self.locate_inode(inode_index);
- // debug!("get_inode_mut(inode_index: {}) -> block_index: {}, offset: {}", inode_index, block_index, offset);
- self.cached_inodes
- .get_block_mut::<InodeBlock>(block_index)
- .map(|cached_block| {
- cached_block.dirty = true; // 保守一些, 只要返回了 &mut Inode 这个页一定标记为脏
- &mut cached_block.block.inodes[offset / INODE_SIZE]
- })
- })
- }
-
- #[allow(unused)]
- pub(crate) fn peek_inode(&self, inode_index: usize) -> Option<&Inode> {
- self.inode_bitmap.query(inode_index).and_then(|| {
- let (block_index, offset) = self.locate_inode(inode_index);
- self.cached_inodes
- .peek_block::<InodeBlock>(block_index)
- .map(|cached_block| &cached_block.block.inodes[offset / INODE_SIZE])
- })
- }
-
- #[allow(unused)]
- pub(crate) fn peek_inode_mut(&mut self, inode_index: usize) -> Option<&mut Inode> {
- self.inode_bitmap.query(inode_index).and_then(|| {
- let (block_index, offset) = self.locate_inode(inode_index);
- self.cached_inodes
- .peek_block_mut::<InodeBlock>(block_index)
- .map(|cached_block| {
- cached_block.dirty = true; // 保守一些, 只要返回了 &mut Inode 这个页一定标记为脏
- &mut cached_block.block.inodes[offset / INODE_SIZE]
- })
- })
- }
-}
diff --git a/ayafs/src/memory/dir_entry.rs b/ayafs/src/memory/dir_entry.rs
deleted file mode 100644
index c013e1e..0000000
--- a/ayafs/src/memory/dir_entry.rs
+++ /dev/null
@@ -1,305 +0,0 @@
-use crate::disk::block::{DirectoryBlock, DirectoryEntry};
-use crate::disk::inode::Inode;
-use crate::AyaFS;
-use indexmap::IndexMap;
-use libc::{c_int, ENOENT, ENOSPC};
-use log::debug;
-use std::ffi::{OsStr, OsString};
-use std::os::unix::ffi::OsStrExt;
-use indexmap::map::Entry::Occupied;
-
-impl AyaFS {
- pub(crate) fn init_direntry_map(&mut self, index: usize) {
- let direntry_map: IndexMap<OsString, DirectoryEntry> = IndexMap::new();
- if let Some((old_inode_index, old_dir_entry_map)) =
- self.dir_entry_map.push(index, direntry_map)
- {
- if let Some(old_inode) = self.get_inode(old_inode_index) {
- let mut old_inode = old_inode.clone();
- self.write_back_direntry(old_inode_index, &mut old_inode, old_dir_entry_map)
- .unwrap();
- self.update_inode(old_inode_index, old_inode);
- }
- }
- }
-
- pub(crate) fn load_direntry_map(&mut self, index: usize, inode: &Inode) -> Result<(), c_int> {
- if self.dir_entry_map.contains(&index) {
- debug!("load_direntry_map(ino: {}) already in cache", index);
- return Ok(());
- }
-
- debug!("load_direntry_map(ino: {}) loading", index);
- let mut dir_entry_map: IndexMap<OsString, DirectoryEntry> = IndexMap::new();
- let mut entry_index: usize = 0;
- loop {
- let block_index_within_inode = entry_index / 15;
- let entry_index_within_block = entry_index % 15;
-
- match self.access_block::<DirectoryBlock>(inode, block_index_within_inode) {
- Some(directory_block) => {
- if directory_block.block.query(entry_index_within_block) {
- let dir_entry = &directory_block.block.entries[entry_index_within_block];
- let name = dir_entry.name();
- dir_entry_map.insert(name, dir_entry.clone());
- } else {
- break;
- }
- }
- None => break,
- }
- entry_index += 1;
- }
-
- if let Some((old_inode_index, old_dir_entry_map)) =
- self.dir_entry_map.push(index, dir_entry_map)
- {
- if let Some(old_inode) = self.get_inode(old_inode_index) {
- let mut old_inode = old_inode.clone();
- self.write_back_direntry(old_inode_index, &mut old_inode, old_dir_entry_map)?;
- self.update_inode(old_inode_index, old_inode);
- }
- }
-
- Ok(())
- }
-
- pub(crate) fn write_back_direntry(
- &mut self,
- _parent_index: usize,
- parent_inode: &mut Inode,
- dir_entry_map: IndexMap<OsString, DirectoryEntry>,
- ) -> Result<(), c_int> {
- for (entry_index, (_, dir_entry)) in dir_entry_map.into_iter().enumerate() {
- let block_index_within_inode = entry_index / 15;
- let entry_index_within_block = entry_index % 15;
- // 不够就新分配
- if self
- .get_block_index(parent_inode, block_index_within_inode)
- .is_none()
- {
- match self.allocate_block_for(parent_inode) {
- Some((_, block_index_within)) => {
- assert_eq!(block_index_within, block_index_within_inode);
- }
- None => {
- return Err(ENOSPC);
- }
- }
- }
- match self.access_block_mut::<DirectoryBlock>(parent_inode, block_index_within_inode) {
- Some(directory_block) => {
- directory_block.block.allocate(entry_index_within_block);
- directory_block.block.entries[entry_index_within_block] = dir_entry;
- }
- None => {
- return Err(ENOENT);
- }
- }
- }
- Ok(())
- }
-
- pub(crate) fn exchange_direntry<T: AsRef<OsStr>>(
- &mut self,
- parent_index: usize,
- parent_inode: &mut Inode,
- name: T,
- new_parent_index: usize,
- new_parent_inode: &mut Inode,
- new_name: T,
- ) -> Result<(), c_int> {
- self.load_direntry_map(parent_index, parent_inode)?;
- self.load_direntry_map(new_parent_index, new_parent_inode)?;
-
- let dir_entry = self.dir_entry_map
- .get(&parent_index)
- .ok_or(ENOENT)?
- .get(name.as_ref())
- .cloned()
- .ok_or(ENOENT)?;
- let new_dir_entry = self.dir_entry_map
- .get(&new_parent_index)
- .ok_or(ENOENT)?
- .get(new_name.as_ref())
- .cloned()
- .ok_or(ENOENT)?;
-
- let name: &OsStr = name.as_ref();
- let new_name: &OsStr = new_name.as_ref();
-
- self.dir_entry_map
- .get_mut(&parent_index)
- .map(|dir_entry_map| {
- if let Occupied(mut entry) = dir_entry_map.entry(name.to_os_string()) {
- *entry.get_mut() = new_dir_entry.clone();
- }
- })
- .ok_or(ENOENT)?;
- self.dir_entry_map
- .get_mut(&new_parent_index)
- .map(|new_dir_entry_map| {
- if let Occupied(mut entry) = new_dir_entry_map.entry(new_name.to_os_string()) {
- *entry.get_mut() = dir_entry.clone();
- }
- })
- .ok_or(ENOENT)?;
-
- Ok(())
- }
-
- /// 删除第 entry_index 个 dir entry
- pub(crate) fn remove_direntry<T: AsRef<OsStr>>(
- &mut self,
- parent_index: usize,
- parent_inode: &mut Inode,
- name: T,
- _entry_index: u32,
- ) -> Result<(), c_int> {
- self.load_direntry_map(parent_index, parent_inode)?;
- if let Some(dir_entry_map) = self.dir_entry_map.get_mut(&parent_index) {
- debug!(" remove_direntry(ino: {}) using hashmap", parent_index);
- if dir_entry_map.shift_remove(name.as_ref()).is_some() {
- Ok(())
- } else {
- Err(ENOENT)
- }
- } else {
- Err(ENOENT)
- }
- }
-
- pub(crate) fn add_direntry_2<T: AsRef<OsStr>>(
- &mut self,
- parent_index: usize,
- parent_inode: &mut Inode,
- child_inode_name: T,
- dir_entry: DirectoryEntry,
- ) -> Result<u32, c_int> {
- let child_inode_name = child_inode_name.as_ref();
- self.load_direntry_map(parent_index, parent_inode)?;
- if let Some(dir_entry_map) = self.dir_entry_map.get_mut(&parent_index) {
- let (entry_index, _) =
- dir_entry_map.insert_full(child_inode_name.to_os_string(), dir_entry);
- debug!(
- " add_direntry(ino: {}) using hashmap, entry {}",
- parent_index, entry_index
- );
- parent_inode.size += 1;
- Ok(entry_index as u32)
- } else {
- Err(ENOENT)
- }
- }
-
- pub(crate) fn add_direntry<T: AsRef<OsStr>>(
- &mut self,
- parent_index: usize,
- parent_inode: &mut Inode,
- child_inode_index: usize,
- child_inode_name: T,
- file_type: u8,
- ) -> Result<u32, c_int> {
- let child_inode_name = child_inode_name.as_ref();
- self.load_direntry_map(parent_index, parent_inode)?;
- if let Some(dir_entry_map) = self.dir_entry_map.get_mut(&parent_index) {
- let name_len = child_inode_name.len() as u8;
- let mut name = [0u8; 256];
- (&mut name[0..child_inode_name.len()]).copy_from_slice(child_inode_name.as_bytes());
-
- let dir_entry = DirectoryEntry {
- inode: child_inode_index as u32,
- record_len: 264,
- name_len,
- file_type,
- name,
- };
-
- let (entry_index, _) =
- dir_entry_map.insert_full(child_inode_name.to_os_string(), dir_entry);
- debug!(
- " add_direntry(ino: {}) using hashmap, entry {}",
- parent_index, entry_index
- );
- parent_inode.size += 1;
- Ok(entry_index as u32)
- } else {
- Err(ENOENT)
- }
- }
-
- pub(crate) fn get_direntry_by_name<T: AsRef<OsStr>>(
- &mut self,
- parent_index: usize,
- parent_inode: &Inode,
- name: T,
- ) -> Result<DirectoryEntry, c_int> {
- self.load_direntry_map(parent_index, parent_inode)?;
- if let Some(dir_entry_map) = self.dir_entry_map.get(&parent_index) {
- debug!(
- " get_direntry(ino: {}, name: {:?}) using hashmap",
- parent_index, name.as_ref()
- );
- dir_entry_map
- .get(name.as_ref())
- .cloned()
- .ok_or(ENOENT)
- } else {
- Err(ENOENT)
- }
- }
-
- pub(crate) fn get_direntry(
- &mut self,
- parent_index: usize,
- parent_inode: &Inode,
- entry_index: u32,
- ) -> Result<DirectoryEntry, c_int> {
- self.load_direntry_map(parent_index, parent_inode)?;
- if let Some(dir_entry_map) = self.dir_entry_map.get(&parent_index) {
- debug!(
- " get_direntry(ino: {}, entry_index: {}) using hashmap",
- parent_index, entry_index
- );
- dir_entry_map
- .iter()
- .skip(entry_index as usize)
- .next()
- .map(|entry| entry.1.clone())
- .ok_or(ENOENT)
- } else {
- Err(ENOENT)
- }
- }
-
- /// 返回 inode_index, inode 在 parent 里的 index, inode 本身
- pub fn lookup_name(
- &mut self,
- parent_index: usize,
- parent_inode: &Inode,
- name: &OsStr,
- ) -> Result<(u32, u32, Inode), c_int> {
- self.load_direntry_map(parent_index, parent_inode)?;
- if let Some(dir_entry_map) = self.dir_entry_map.get(&parent_index) {
- if let Some((entry_index, _, dir_entry)) = dir_entry_map.get_full(name) {
- let inode_index = dir_entry.inode;
- let inode = self.get_inode(inode_index as usize).unwrap().clone();
- Ok((inode_index, entry_index as u32, inode))
- } else {
- Err(ENOENT)
- }
- } else {
- let mut entry_index = 0;
- while entry_index < parent_inode.size {
- if let Ok(entry) = self.get_direntry(parent_index, parent_inode, entry_index) {
- if entry.name() == name {
- let inode = self.get_inode(entry.inode as usize).unwrap().clone();
- return Ok((entry.inode, entry_index, inode));
- }
- }
- entry_index += 1;
- }
- Err(ENOENT)
- }
- }
-}
diff --git a/ayafs/src/memory/file_handle.rs b/ayafs/src/memory/file_handle.rs
deleted file mode 100644
index c821619..0000000
--- a/ayafs/src/memory/file_handle.rs
+++ /dev/null
@@ -1,15 +0,0 @@
-use crate::AyaFS;
-use std::sync::atomic::Ordering;
-
-impl AyaFS {
- pub(crate) fn allocate_file_descriptor(
- &mut self,
- inode_index: usize,
- read: bool,
- write: bool,
- ) -> u64 {
- let fd = self.next_file_handle.fetch_add(1, Ordering::SeqCst);
- self.file_handle_map.insert(fd, (inode_index, read, write));
- fd
- }
-}
diff --git a/ayafs/src/memory/mod.rs b/ayafs/src/memory/mod.rs
deleted file mode 100644
index d1f1ab8..0000000
--- a/ayafs/src/memory/mod.rs
+++ /dev/null
@@ -1,6 +0,0 @@
-/// In-memory data structures and logic.
-/// This is where the crucial block and inode methods presented to upper calls implemented.
-pub mod cached_block;
-pub mod cached_inode;
-mod dir_entry;
-mod file_handle;
diff --git a/ayafs/src/tests/bitmap.rs b/ayafs/src/tests/bitmap.rs
deleted file mode 100644
index 1a43f09..0000000
--- a/ayafs/src/tests/bitmap.rs
+++ /dev/null
@@ -1,38 +0,0 @@
-use crate::tests::common;
-use indexmap::IndexMap;
-
-#[test]
-fn test_allocate() {
- let mut fs = common::setup();
- for _ in 0..10 {
- fs.data_bitmap.allocate().unwrap();
- }
- assert!(fs.data_bitmap.deallocate(5));
- assert_eq!(fs.data_bitmap.allocate().unwrap(), 5);
- assert_eq!(fs.data_bitmap.allocate().unwrap(), 11);
-}
-
-#[test]
-fn test_query() {
- let mut fs = common::setup();
- for _ in 0..10 {
- fs.data_bitmap.allocate().unwrap();
- }
- assert_eq!(fs.data_bitmap.query(0), false);
- assert_eq!(fs.data_bitmap.query(5), true);
- assert_eq!(fs.data_bitmap.query(11), false);
-}
-
-#[test]
-fn test_index_map() {
- let mut map: IndexMap<i32, i32> = IndexMap::new();
- map.insert(1, 2);
- map.insert(2, 3);
- map.insert(3, 4);
- map.insert(4, 5);
- map.remove(&3);
-
- for (entry_index, (key, value)) in map.iter().enumerate() {
- println!("index {}, key {}, value {}", entry_index, key, value);
- }
-}
diff --git a/ayafs/src/tests/block_cache.rs b/ayafs/src/tests/block_cache.rs
deleted file mode 100644
index 52117b9..0000000
--- a/ayafs/src/tests/block_cache.rs
+++ /dev/null
@@ -1,245 +0,0 @@
-use crate::disk::block::{DataBlock, DoubleIndirectBlock, IndirectBlock};
-use crate::disk::inode::InodeMode;
-use crate::tests::common;
-
-#[test]
-fn test_basic_lru() {
- let mut fs = common::setup();
-
- let v: Vec<usize> = (1..=256)
- .map(|_| {
- let index = fs.data_bitmap.allocate().unwrap();
- fs.get_block::<DataBlock>(index).unwrap();
- index
- })
- .collect();
- assert!(fs.peek_block::<DataBlock>(v[0]).is_some());
-
- for i in 0..256 {
- let index = fs.data_bitmap.allocate().unwrap();
- fs.get_block::<DataBlock>(index).unwrap();
- assert!(fs.peek_block::<DataBlock>(v[i]).is_none());
- }
-}
-
-#[test]
-fn test_inode_allocation() {
- let mut fs = common::setup();
-
- let (inode_index, inode) = fs.create_directory(0o755, 0, 0, 0, None).unwrap();
- let mut inode = inode.clone();
-
- const DIRECT_NUMBER: u32 = 15;
- const INDIRECT_NUMBER: u32 = 1024;
- // const DOUBLE_INDIRECT_NUMBER: u32 = 1024 * 1024;
-
- for i in 0..DIRECT_NUMBER {
- fs.allocate_block_for(&mut inode).unwrap();
- assert!(fs.data_bitmap.query(inode.direct[i as usize] as usize))
- }
-
- for _i in 0..INDIRECT_NUMBER {
- fs.allocate_block_for(&mut inode).unwrap();
- }
-
- println!("single indirect is {}", inode.single_indirect);
- println!("double indirect is {}", inode.double_indirect);
- println!("triple indirect is {}", inode.triple_indirect);
-
- let indirect_block = fs
- .peek_block::<IndirectBlock>(inode.single_indirect as usize)
- .unwrap();
- for entry in indirect_block.block.entries {
- assert_ne!(entry, 0);
- assert!(fs.data_bitmap.query(entry as usize));
- }
-
- assert_eq!(fs.data_bitmap.query(inode.double_indirect as usize), false);
- assert_eq!(fs.data_bitmap.query(inode.triple_indirect as usize), false);
-
- for _i in 0..INDIRECT_NUMBER {
- fs.allocate_block_for(&mut inode).unwrap();
- }
-
- let double_indirect = inode.double_indirect;
- println!(
- "double indirect is {} after allocation",
- inode.double_indirect
- );
-
- fs.update_inode(inode_index, inode);
-
- assert!(fs.data_bitmap.query(double_indirect as usize));
-}
-
-#[test]
-fn test_inode_deallocation() {
- let mut fs = common::setup();
-
- let (inode_index, inode) = fs.create_directory(0o755, 0, 0, 0, None).unwrap();
- let mut inode = inode.clone();
-
- const DIRECT_NUMBER: u32 = 15;
- const INDIRECT_NUMBER: u32 = 1024;
- // const DOUBLE_INDIRECT_NUMBER: u32 = 1024 * 1024;
-
- for i in 0..DIRECT_NUMBER {
- println!("Allocated {:?}", fs.allocate_block_for(&mut inode).unwrap());
- assert!(fs.data_bitmap.query(inode.direct[i as usize] as usize))
- }
-
- for _i in 0..2 * INDIRECT_NUMBER {
- println!("Allocated {:?}", fs.allocate_block_for(&mut inode).unwrap());
- }
-
- println!("single indirect is {}", inode.single_indirect);
- println!("double indirect is {}", inode.double_indirect);
- println!("triple indirect is {}", inode.triple_indirect);
-
- assert!(fs.data_bitmap.query(inode.double_indirect as usize));
-
- for i in 0..INDIRECT_NUMBER + 5 {
- println!(
- "Deallocated {}",
- fs.deallocate_block_for(&mut inode).unwrap()
- );
- }
-
- println!("single indirect is {}", inode.single_indirect);
- println!("double indirect is {}", inode.double_indirect);
- println!("triple indirect is {}", inode.triple_indirect);
-
- assert_eq!(fs.data_bitmap.query(inode.double_indirect as usize), false);
-
- fs.update_inode(inode_index, inode);
-}
-
-#[test]
-fn test_multiple_inode_allocation() {
- let mut fs = common::setup();
-
- let (inode_index_1, inode_1) = fs.create_directory(0o755, 0, 0, 0, None).unwrap();
- let mut inode_1 = inode_1.clone();
-
- let (inode_index_2, inode_2) = fs.create_file(0o755, 0, 0, 0).unwrap();
- let mut inode_2 = inode_2.clone();
- // let mut inode_1 = fs.get_inode(inode_index_1).unwrap().clone();
- // let mut inode_2 = fs.get_inode(inode_index_2).unwrap().clone();
-
- const DIRECT_NUMBER: u32 = 15;
- const INDIRECT_NUMBER: u32 = 1024;
-
- for i in 0..DIRECT_NUMBER + INDIRECT_NUMBER {
- println!(
- "Allocated {:?} in inode {}",
- fs.allocate_block_for(&mut inode_1).unwrap(),
- inode_index_1
- );
- println!(
- "Allocated {:?} in inode {}",
- fs.allocate_block_for(&mut inode_2).unwrap(),
- inode_index_2
- );
- }
-
- let (inode_index_3, inode_3) = fs.create_directory(0o755, 0, 0, 0, None).unwrap();
- let mut inode_3 = inode_3.clone();
- // let mut inode_3 = fs.get_inode(inode_index_3).unwrap().clone();
-
- for _i in 0..INDIRECT_NUMBER {
- println!(
- "Deallocated {} in inode {}",
- fs.deallocate_block_for(&mut inode_1).unwrap(),
- inode_index_1
- );
- println!(
- "Allocated {:?} in inode {}",
- fs.allocate_block_for(&mut inode_3).unwrap(),
- inode_index_3
- );
- }
-
- for _i in 0..DIRECT_NUMBER {
- println!(
- "Deallocated {} in inode {}",
- fs.deallocate_block_for(&mut inode_1).unwrap(),
- inode_index_1
- );
- }
-
- assert!(fs.deallocate_block_for(&mut inode_1).is_none());
-
- println!(
- "single indirect is {} for {}",
- inode_1.single_indirect, inode_index_1
- );
- println!(
- "double indirect is {} for {}",
- inode_1.double_indirect, inode_index_1
- );
- println!(
- "single indirect is {} for {}",
- inode_2.single_indirect, inode_index_2
- );
- println!(
- "double indirect is {} for {}",
- inode_2.double_indirect, inode_index_2
- );
- println!(
- "single indirect is {} for {}",
- inode_3.single_indirect, inode_index_3
- );
- println!(
- "double indirect is {} for {}",
- inode_3.double_indirect, inode_index_3
- );
-
- assert_eq!(
- fs.data_bitmap.query(inode_1.single_indirect as usize),
- false
- );
- assert!(fs.data_bitmap.query(inode_2.single_indirect as usize));
- assert_eq!(
- fs.data_bitmap.query(inode_2.double_indirect as usize),
- false
- );
- assert!(fs.data_bitmap.query(inode_3.single_indirect as usize));
- assert_eq!(
- fs.data_bitmap.query(inode_3.double_indirect as usize),
- false
- );
-
- fs.allocate_block_for(&mut inode_2).unwrap();
- println!("-----------------");
- println!(
- "double indirect is {} for {}",
- inode_2.double_indirect, inode_index_2
- );
-
- assert!(fs.data_bitmap.query(inode_2.double_indirect as usize));
-
- for _i in 0..DIRECT_NUMBER {
- fs.allocate_block_for(&mut inode_3).unwrap();
- }
- println!("-----------------");
- println!(
- "double indirect is {} for {}",
- inode_3.double_indirect, inode_index_3
- );
- assert_eq!(
- fs.data_bitmap.query(inode_3.double_indirect as usize),
- false
- );
-
- fs.allocate_block_for(&mut inode_3).unwrap();
- println!("-----------------");
- println!(
- "double indirect is {} for {}",
- inode_3.double_indirect, inode_index_3
- );
- assert!(fs.data_bitmap.query(inode_3.double_indirect as usize));
-
- fs.update_inode(inode_index_1, inode_1);
- fs.update_inode(inode_index_2, inode_2);
- fs.update_inode(inode_index_3, inode_3);
-}
diff --git a/ayafs/src/tests/common/mod.rs b/ayafs/src/tests/common/mod.rs
deleted file mode 100644
index 3abfcb4..0000000
--- a/ayafs/src/tests/common/mod.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-use crate::block_device::memory_disk::MemoryDisk;
-use crate::AyaFS;
-use std::sync::Arc;
-
-#[allow(unused)]
-pub(crate) fn setup() -> AyaFS {
- let mem_disk = Arc::new(MemoryDisk::new(1059715));
- AyaFS::new(mem_disk, 1059715)
-}
diff --git a/ayafs/src/tests/mod.rs b/ayafs/src/tests/mod.rs
deleted file mode 100644
index df442c1..0000000
--- a/ayafs/src/tests/mod.rs
+++ /dev/null
@@ -1,6 +0,0 @@
-#[cfg(test)]
-mod bitmap;
-mod common;
-
-#[cfg(test)]
-mod block_cache;
diff --git a/ayafs/src/utils/constants.rs b/ayafs/src/utils/constants.rs
deleted file mode 100644
index 8b13789..0000000
--- a/ayafs/src/utils/constants.rs
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/ayafs/src/utils/mod.rs b/ayafs/src/utils/mod.rs
deleted file mode 100644
index 468ebdb..0000000
--- a/ayafs/src/utils/mod.rs
+++ /dev/null
@@ -1,92 +0,0 @@
-mod constants;
-pub mod permissions;
-
-use crate::block_device::BLOCK_SIZE;
-use crate::disk::inode::{Inode, INODE_SIZE};
-use crate::{AyaFS, INODE_PER_BLOCK};
-use fuser::{FileAttr, FileType};
-use std::time::{Duration, SystemTime, UNIX_EPOCH};
-
-pub(crate) fn time_now() -> u32 {
- SystemTime::now()
- .duration_since(UNIX_EPOCH)
- .expect("How can current time be earlier than UNIX_EPOCH?")
- .as_secs() as u32
-}
-
-pub(crate) fn from_systime(system_time: SystemTime) -> u32 {
- system_time
- .duration_since(UNIX_EPOCH)
- .expect("How can current time be earlier than UNIX_EPOCH?")
- .as_secs() as u32
-}
-
-pub(crate) fn to_systime(time: u32) -> SystemTime {
- UNIX_EPOCH + Duration::from_secs(time as u64)
-}
-
-// File type code, one of:
-// 0x0 Unknown.
-// 0x1 Regular file.
-// 0x2 Directory.
-// 0x3 Character device file.
-// 0x4 Block device file.
-// 0x5 FIFO.
-// 0x6 Socket.
-// 0x7 Symbolic link.
-
-pub(crate) fn from_filetype(file_type: FileType) -> u8 {
- match file_type {
- FileType::NamedPipe => 0x5,
- FileType::CharDevice => 0x3,
- FileType::BlockDevice => 0x4,
- FileType::Directory => 0x2,
- FileType::RegularFile => 0x1,
- FileType::Symlink => 0x7,
- FileType::Socket => 0x6,
- }
-}
-
-pub(crate) fn to_filetype(file_type: u8) -> Option<FileType> {
- match file_type {
- 0x0 => None,
- 0x1 => Some(FileType::RegularFile),
- 0x2 => Some(FileType::Directory),
- 0x3 => Some(FileType::CharDevice),
- 0x4 => Some(FileType::BlockDevice),
- 0x5 => Some(FileType::NamedPipe),
- 0x6 => Some(FileType::Socket),
- 0x7 => Some(FileType::Symlink),
- _ => panic!("bad filetype"),
- }
-}
-
-pub(crate) fn to_fileattr(inode_index: usize, inode: &Inode) -> FileAttr {
- FileAttr {
- ino: inode_index as u64,
- size: inode.size as u64,
- blocks: inode.n_blocks as u64,
- atime: to_systime(inode.atime),
- mtime: to_systime(inode.mtime),
- ctime: to_systime(inode.ctime),
- crtime: to_systime(inode.crtime),
- kind: inode.mode.into(),
- perm: inode.mode.perm(),
- nlink: inode.n_links as u32,
- uid: inode.uid,
- gid: inode.gid,
- rdev: 0,
- blksize: BLOCK_SIZE as u32,
- flags: inode.flags,
- }
-}
-
-impl AyaFS {
- /// 输入 inode 编号, 返回它对应的 block number 和 block 内 offset
- pub(crate) fn locate_inode(&self, inode_index: usize) -> (usize, usize) {
- let block_number =
- inode_index / INODE_PER_BLOCK + 1 + self.inode_bitmap.length + self.data_bitmap.length;
- let block_offset = inode_index % INODE_PER_BLOCK * INODE_SIZE;
- (block_number, block_offset)
- }
-}
diff --git a/ayafs/src/utils/permissions.rs b/ayafs/src/utils/permissions.rs
deleted file mode 100644
index 6773511..0000000
--- a/ayafs/src/utils/permissions.rs
+++ /dev/null
@@ -1,62 +0,0 @@
-use crate::disk::inode::InodeMode;
-use libc::{F_OK, S_ISGID, S_ISUID, S_IXGRP, X_OK};
-use std::fs::File;
-use std::io::BufRead;
-
-pub(crate) fn get_groups(pid: u32) -> Vec<u32> {
- let file = File::open(format!("/proc/{pid}/task/{pid}/status"))
- .expect(format!("pid {pid} incorrect!").as_str());
- for line in std::io::BufReader::new(file).lines() {
- let line = line.unwrap();
- if line.starts_with("Groups:") {
- return line["Groups: ".len()..]
- .split(' ')
- .filter(|x| !x.trim().is_empty())
- .map(|x| x.parse::<u32>().unwrap())
- .collect();
- }
- }
-
- Vec::new()
-}
-
-pub(crate) fn clear_suid_sgid(mut mode: InodeMode) -> InodeMode {
- mode.0 &= !S_ISUID as u16;
- if mode.0 & S_IXGRP as u16 != 0 {
- mode.0 &= !S_ISGID as u16;
- }
- mode
-}
-
-pub(crate) fn check_access(
- incoming_uid: u32,
- incoming_gid: u32,
- uid: u32,
- gid: u32,
- mode: InodeMode,
- mut mask: i32,
-) -> bool {
- if mask == F_OK {
- return true;
- }
-
- let perm = i32::from(mode.0);
- // root
- if incoming_uid == 0 {
- // 读写任何东西都是可以的, 执行只有 IXOTH/IXGRP/IXUSR 之一设置才可以
- mask &= X_OK;
- mask -= mask & (perm >> 6);
- mask -= mask & (perm >> 3);
- mask -= mask & perm;
- return mask == 0;
- }
-
- if incoming_uid == uid {
- mask -= mask & (perm >> 6);
- } else if incoming_gid == gid {
- mask -= mask & (perm >> 3);
- } else {
- mask -= mask & perm;
- }
- mask == 0
-}
generated by cgit v1.2.3-70-g09d2 (git 2.47.0) at 2024-11-24 12:25:39 +0000