From b2ffbc34b59ce8002cf3d50cf37ae859bcf35c5c Mon Sep 17 00:00:00 2001
From: Julien CLEMENT <julien.clement@epita.fr>
Date: Fri, 23 Dec 2022 20:02:49 +0100
Subject: [PATCH] basic virtual file system

Signed-off-by: Julien CLEMENT <julien.clement@epita.fr>
---
 src/fs/iso/mod.rs |  2 +-
 src/fs/mod.rs     | 32 +++++++++++++++++++++++++++++++-
 src/lib.rs        |  2 +-
 3 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/src/fs/iso/mod.rs b/src/fs/iso/mod.rs
index 610c5a7..52236c6 100644
--- a/src/fs/iso/mod.rs
+++ b/src/fs/iso/mod.rs
@@ -18,7 +18,7 @@ pub struct IsoFS {
 
 #[async_trait(?Send)]
 impl FileSystem for IsoFS {
-    async fn open(path: &str, flags: u32) -> Option<FDt> {
+    async fn open(&mut self, path: &str, flags: u32) -> Option<FDt> {
         if flags != crate::syscalls::io::O_RDONLY {
             return None;
         }
diff --git a/src/fs/mod.rs b/src/fs/mod.rs
index 7631314..6ea55db 100644
--- a/src/fs/mod.rs
+++ b/src/fs/mod.rs
@@ -1,11 +1,41 @@
 pub mod iso;
 
 use crate::fd::FDt;
+use crate::utils::mutex::AsyncMutex;
 
 use alloc::{sync::Arc, boxed::Box};
 use async_trait::async_trait;
+use core::cell::RefCell;
+use lazy_static::lazy_static;
+
+pub type FSt = Arc<RefCell<dyn FileSystem>>;
+
+lazy_static! {
+    pub static ref VIRTUAL_FS: AsyncMutex<VirtualFS> = {
+        AsyncMutex::new(VirtualFS::new())
+    };
+}
 
 #[async_trait(?Send)]
 pub trait FileSystem {
-    async fn open(path: &str, flags: u32) -> Option<FDt>;
+    async fn open(&mut self, path: &str, flags: u32) -> Option<FDt>;
+}
+
+pub struct VirtualFS {
+    fs: FSt,
+}
+
+impl VirtualFS {
+    fn new() -> Self {
+        VirtualFS {
+            fs: Arc::new(RefCell::new(iso::IsoFS {}))
+        }
+    }
+}
+
+#[async_trait(?Send)]
+impl FileSystem for VirtualFS {
+    async fn open(&mut self, path: &str, flags: u32) -> Option<FDt> {
+        self.fs.borrow_mut().open(path, flags).await
+    }
 }
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
index 240a2ec..4b96f0d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -66,6 +66,6 @@ pub extern "C" fn julios_main(multiboot_info_addr: usize) -> ! {
 
 
 async fn get_file() {
-    let fd = fs::iso::IsoFS::open("test", syscalls::io::O_RDONLY).await.unwrap();
+    let fd = fs::VIRTUAL_FS.lock().await.open("test", syscalls::io::O_RDONLY).await.unwrap();
     fd.borrow_mut().read(&[], 0).await;
 }
\ No newline at end of file