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authorChuyan Zhang <me@zcy.moe>2023-10-17 23:07:21 -0700
committerChuyan Zhang <me@zcy.moe>2023-10-17 23:07:21 -0700
commit7a748cadbb2e2ce8c0e045cb8fbd77ccbd47459f (patch)
tree07ed09bb6c55110dd2f2ea59283623f023b11666 /src/block_device
downloadmyfs-7a748cadbb2e2ce8c0e045cb8fbd77ccbd47459f.tar.gz
myfs-7a748cadbb2e2ce8c0e045cb8fbd77ccbd47459f.zip
initial commit
Diffstat (limited to 'src/block_device')
-rw-r--r--src/block_device/memory_disk.rs34
-rw-r--r--src/block_device/mod.rs7
2 files changed, 41 insertions, 0 deletions
diff --git a/src/block_device/memory_disk.rs b/src/block_device/memory_disk.rs
new file mode 100644
index 0000000..4cffaf2
--- /dev/null
+++ b/src/block_device/memory_disk.rs
@@ -0,0 +1,34 @@
+use std::cell::RefCell;
+use crate::block_device::{BLOCK_SIZE, BlockDevice};
+
+#[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() -> Self {
+ Self {
+ arena: RefCell::new(vec![0u8; BLOCK_SIZE * 16384]),
+ }
+ }
+
+}
+
+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);
+ }
+} \ No newline at end of file
diff --git a/src/block_device/mod.rs b/src/block_device/mod.rs
new file mode 100644
index 0000000..9d52e53
--- /dev/null
+++ b/src/block_device/mod.rs
@@ -0,0 +1,7 @@
+pub mod memory_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]);
+}