VFS: move stuff into a VirtualFileSystem struct

ableos/src/filesystem/ext2.rs

@@ -13,7 +13,7 @@ use ext2::volume::Volume;
 use crate::handle::{Handle, HandleResource};
 
 use super::errors::FsError;
-use super::vfs::{add_fs_node, find_fs_node, DirectoryEntry, FsFlags};
+use super::vfs::{DirectoryEntry, FsFlags, VFS};
 use super::{FsNode, FsResult as Result, StorageDevice};
 
 pub struct Ext2StorageDevice<S, V>
@@ -43,7 +43,8 @@ where
             Weak::new(),
         ));
 
-        add_fs_node(root.clone());
+        let mut vfs = VFS.lock();
+        vfs.add_fs_node(root.clone());
 
         Ok(Self {
             fs,
@@ -93,9 +94,11 @@ where
             .fs
             .inode_nth(entry.inode)
             .ok_or_else(|| FsError::InodeNotFound)?;
-        let entry_node_handle =
-            find_fs_node(entry.inode, self.device_handle).unwrap_or_else(|| {
-                add_fs_node(Arc::new(FsNode::new(
+        let mut vfs = VFS.lock();
+        let entry_node_handle = vfs
+            .find_fs_node(entry.inode, self.device_handle)
+            .unwrap_or_else(|| {
+                vfs.add_fs_node(Arc::new(FsNode::new(
                     ext2_type_to_fs_flags(entry_inode.type_perm()),
                     inode.size(),
                     entry.inode,
@@ -117,6 +120,7 @@ where
             .ok_or_else(|| FsError::InodeNotFound)?;
         let dir = inode.directory().ok_or_else(|| FsError::NotADirectory)?;
         let mut found_node = Err(FsError::NotFound);
+        let mut vfs = VFS.lock();
         for entry in dir {
             if entry.is_err() {
                 continue;
@@ -124,17 +128,17 @@ where
 
             let entry = entry.unwrap();
             if entry.file_name_string() == name {
-                found_node = Ok(
-                    find_fs_node(entry.inode, self.device_handle).unwrap_or_else(|| {
-                        add_fs_node(Arc::new(FsNode::new(
+                found_node = Ok(vfs
+                    .find_fs_node(entry.inode, self.device_handle)
+                    .unwrap_or_else(|| {
+                        vfs.add_fs_node(Arc::new(FsNode::new(
                             ext2_type_to_fs_flags(inode.type_perm()),
                             inode.size(),
                             entry.inode,
                             self.device_handle,
                             Weak::new(),
                         )))
-                    }),
-                );
+                    }));
             }
         }
 

ableos/src/filesystem/mod.rs

@@ -11,7 +11,7 @@ pub mod vfs;
 use ::ext2::sector::Size1024;
 use alloc::sync::Arc;
 
-use crate::{filesystem::vfs::fs_node, handle::Handle, KERNEL_STATE};
+use crate::{filesystem::vfs::VFS, handle::Handle, KERNEL_STATE};
 
 use self::{
     errors::FsError,
@@ -39,7 +39,10 @@ where
 
 pub fn init() -> Result<()> {
     let mut state = KERNEL_STATE.lock();
-    state.add_storage_device(load_fs()?);
+    let mut vfs = VFS.lock();
+    let fs = load_fs()?;
+    vfs.init(fs.root_node());
+    state.add_storage_device(fs);
     Ok(())
 }
 
@@ -53,8 +56,9 @@ fn load_fs() -> Result<Ext2StorageDevice<Size1024, Vec<u8>>> {
 pub fn walk<S: Into<String>>(dir: Arc<FsNode>, path: S) {
     let path = path.into();
     if let Some(dir) = dir.directory() {
+        let mut vfs = VFS.lock();
         for entry in dir {
-            let fs_node = fs_node(entry.node()).unwrap();
+            let fs_node = vfs.fs_node(entry.node()).unwrap();
             println!("{}/{} => {}", path, entry.name(), fs_node.inode());
             trace!("{entry:#?}");
             if entry.name() != "." && entry.name() != ".." {

ableos/src/filesystem/vfs.rs

@@ -18,30 +18,52 @@ use crate::{
 };
 
 lazy_static! {
-    static ref FS_NODES: Mutex<HashMap<Handle, Arc<FsNode>>> = Default::default();
+    pub static ref VFS: Mutex<VirtualFileSystem> = Default::default();
 }
 
-pub fn add_fs_node(fs_node: Arc<FsNode>) -> Handle {
-    let handle = Handle::new(HandleResource::FsNode);
-    let mut nodes = FS_NODES.lock();
-    nodes.insert(handle, fs_node);
-    handle
+pub struct VirtualFileSystem {
+    fs_nodes: HashMap<Handle, Arc<FsNode>>,
+    root_node: Weak<FsNode>,
 }
 
-pub fn find_fs_node(inode: usize, device_handle: Handle) -> Option<Handle> {
-    let nodes = FS_NODES.lock();
-    nodes.iter().find_map(|(handle, fs_node)| {
-        if fs_node.inode == inode && fs_node.device_handle == device_handle {
-            Some(*handle)
-        } else {
-            None
+impl VirtualFileSystem {
+    pub fn init(&mut self, root_node: Arc<FsNode>) {
+        self.root_node = Arc::downgrade(&root_node)
+    }
+
+    pub fn add_fs_node(&mut self, fs_node: Arc<FsNode>) -> Handle {
+        let handle = Handle::new(HandleResource::FsNode);
+        self.fs_nodes.insert(handle, fs_node);
+        handle
+    }
+
+    pub fn find_fs_node(&mut self, inode: usize, device_handle: Handle) -> Option<Handle> {
+        self.fs_nodes.iter().find_map(|(handle, fs_node)| {
+            if fs_node.inode == inode && fs_node.device_handle == device_handle {
+                Some(*handle)
+            } else {
+                None
+            }
+        })
+    }
+
+    pub fn fs_node(&mut self, handle: Handle) -> Option<Arc<FsNode>> {
+        self.fs_nodes.get(&handle).cloned()
+    }
+
+    pub fn root_node(&self) -> Arc<FsNode> {
+        // okay to unwrap since this should never be called before init
+        self.root_node.upgrade().unwrap()
+    }
+}
+
+impl Default for VirtualFileSystem {
+    fn default() -> Self {
+        Self {
+            fs_nodes: HashMap::new(),
+            root_node: Weak::new(),
         }
-    })
-}
-
-pub fn fs_node(handle: Handle) -> Option<Arc<FsNode>> {
-    let nodes = FS_NODES.lock();
-    nodes.get(&handle).cloned()
+    }
 }
 
 /// A VFS node, that can either be a file or a directory.

ableos/src/scratchpad.rs

@@ -7,13 +7,14 @@
 use crate::arch::drivers::sysinfo::master;
 use crate::arch::interrupts::{reset_pit_for_cpu, set_pit_2};
 use crate::devices::pci::brute_force_scan;
+use crate::filesystem::vfs::VFS;
 use crate::systeminfo::{KERNEL_VERSION, RELEASE_TYPE};
 use crate::time::fetch_time;
 use crate::KERNEL_STATE;
 use crate::{
     arch::shutdown,
     rhai_shell::KEYBUFF,
-    vterm::Term,
+    vterm::VTerm,
     // wasm_jumploader::run_program,
 };
 use crate::{filesystem, KERNEL_STATE};
@@ -123,13 +124,13 @@ pub fn scratchpad() {
     );
 
     let root = {
-        let state = KERNEL_STATE.lock();
-        state.storage_devices.iter().next().unwrap().1.root_node()
+        let vfs = VFS.lock();
+        vfs.root_node()
     };
 
     filesystem::walk(root, "");
 
-    // real_shell();
+    real_shell();
 }
 
 pub fn acpi() {