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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, 3818 insertions, 0 deletions
diff --git a/ayafs/Cargo.toml b/ayafs/Cargo.toml
new file mode 100644
index 0000000..43585e0
--- /dev/null
+++ b/ayafs/Cargo.toml
@@ -0,0 +1,18 @@
+[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
new file mode 100644
index 0000000..3f0b018
--- /dev/null
+++ b/ayafs/src/block_device/disk.rs
@@ -0,0 +1,47 @@
+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
new file mode 100644
index 0000000..0639d3e
--- /dev/null
+++ b/ayafs/src/block_device/memory_disk.rs
@@ -0,0 +1,33 @@
+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
new file mode 100644
index 0000000..a1e6544
--- /dev/null
+++ b/ayafs/src/block_device/mod.rs
@@ -0,0 +1,10 @@
+/// 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
new file mode 100644
index 0000000..a187fad
--- /dev/null
+++ b/ayafs/src/disk/allocation.rs
@@ -0,0 +1,542 @@
+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
new file mode 100644
index 0000000..b68c341
--- /dev/null
+++ b/ayafs/src/disk/bitmap.rs
@@ -0,0 +1,48 @@
+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
new file mode 100644
index 0000000..73819e2
--- /dev/null
+++ b/ayafs/src/disk/block.rs
@@ -0,0 +1,245 @@
+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
new file mode 100644
index 0000000..0c801ad
--- /dev/null
+++ b/ayafs/src/disk/inode.rs
@@ -0,0 +1,312 @@
+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
new file mode 100644
index 0000000..878e832
--- /dev/null
+++ b/ayafs/src/disk/mod.rs
@@ -0,0 +1,6 @@
+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
new file mode 100644
index 0000000..1eaa8e8
--- /dev/null
+++ b/ayafs/src/filesystem/mod.rs
@@ -0,0 +1,2 @@
+/// 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
new file mode 100644
index 0000000..1c40b92
--- /dev/null
+++ b/ayafs/src/filesystem/trait_impl.rs
@@ -0,0 +1,1247 @@
+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
new file mode 100644
index 0000000..db4a017
--- /dev/null
+++ b/ayafs/src/main.rs
@@ -0,0 +1,171 @@
+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
new file mode 100644
index 0000000..c3d0338
--- /dev/null
+++ b/ayafs/src/memory/cached_block.rs
@@ -0,0 +1,180 @@
+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
new file mode 100644
index 0000000..2f26dde
--- /dev/null
+++ b/ayafs/src/memory/cached_inode.rs
@@ -0,0 +1,178 @@
+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
new file mode 100644
index 0000000..c013e1e
--- /dev/null
+++ b/ayafs/src/memory/dir_entry.rs
@@ -0,0 +1,305 @@
+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
new file mode 100644
index 0000000..c821619
--- /dev/null
+++ b/ayafs/src/memory/file_handle.rs
@@ -0,0 +1,15 @@
+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
new file mode 100644
index 0000000..d1f1ab8
--- /dev/null
+++ b/ayafs/src/memory/mod.rs
@@ -0,0 +1,6 @@
+/// 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
new file mode 100644
index 0000000..1a43f09
--- /dev/null
+++ b/ayafs/src/tests/bitmap.rs
@@ -0,0 +1,38 @@
+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
new file mode 100644
index 0000000..52117b9
--- /dev/null
+++ b/ayafs/src/tests/block_cache.rs
@@ -0,0 +1,245 @@
+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
new file mode 100644
index 0000000..3abfcb4
--- /dev/null
+++ b/ayafs/src/tests/common/mod.rs
@@ -0,0 +1,9 @@
+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
new file mode 100644
index 0000000..df442c1
--- /dev/null
+++ b/ayafs/src/tests/mod.rs
@@ -0,0 +1,6 @@
+#[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
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/ayafs/src/utils/constants.rs
@@ -0,0 +1 @@
+
diff --git a/ayafs/src/utils/mod.rs b/ayafs/src/utils/mod.rs
new file mode 100644
index 0000000..468ebdb
--- /dev/null
+++ b/ayafs/src/utils/mod.rs
@@ -0,0 +1,92 @@
+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
new file mode 100644
index 0000000..6773511
--- /dev/null
+++ b/ayafs/src/utils/permissions.rs
@@ -0,0 +1,62 @@
+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
+}