forked from AbleOS/ableos
113 lines
3.1 KiB
Rust
113 lines
3.1 KiB
Rust
/*
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* Copyright (c) 2022, Umut İnan Erdoğan <umutinanerdogan@pm.me>
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*
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* SPDX-License-Identifier: MPL-2.0
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*/
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use alloc::sync::Arc;
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use ext2::fs::{sync::Synced, Ext2};
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use ext2::sector::SectorSize;
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use ext2::volume::Volume;
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use super::errors::FsError;
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use super::{DirectoryEntry, FileDescriptor, FsNode, FsResult as Result, StorageDevice};
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pub struct Ext2StorageDevice<S, V>
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where
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S: SectorSize,
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V: Volume<u8, S>,
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{
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fs: Synced<Ext2<S, V>>,
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}
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impl<S, V> Ext2StorageDevice<S, V>
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where
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S: SectorSize,
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V: Volume<u8, S>,
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{
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pub fn new(volume: V) -> Result<Self> {
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Ok(Self {
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fs: Synced::new(volume).map_err(|e| e.into())?,
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})
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}
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}
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impl<S, V> StorageDevice for Ext2StorageDevice<S, V>
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where
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S: SectorSize + Send,
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V: Volume<u8, S> + Send,
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{
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fn open(&self, node: Arc<FsNode> /* TODO: flags */) -> Result<FileDescriptor> {
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let inode = self
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.fs
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.inode_nth(node.inode as usize)
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.ok_or_else(|| FsError::InodeNotFound)?;
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Ok(FileDescriptor::new(Arc::downgrade(&node), node.flags, inode.size(), node.inode))
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}
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fn release(&self, _node: FsNode) -> Result<()> {
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// TODO: flush to disk and whatnot
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Ok(())
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}
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fn read(&self, node: &FsNode, offset: usize, size: usize, buffer: &mut Vec<u8>) -> Result<()> {
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let inode = self
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.fs
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.inode_nth(node.inode as usize)
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.ok_or_else(|| FsError::InodeNotFound)?;
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// FIXME: I don't really know how Ext2 works, so for now we don't
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// support non-zero offsets and buffer sizes that don't match
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// the file length. We always read the whole file.
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if offset > 0 || size != inode.size() {
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Err(FsError::UnsupportedOperation)?;
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}
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inode.read_to_end(buffer).map_err(|e| e.into())?;
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Ok(())
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}
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fn write(&self, _node: &FsNode, _offset: usize, _buffer: &[u8]) -> Result<()> {
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todo!()
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}
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fn read_dir(&self, _node: &FsNode, _index: usize) -> Result<DirectoryEntry> {
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todo!()
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}
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fn find_dir(&self, _node: &FsNode, _name: &str) -> Result<FsNode> {
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todo!()
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}
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}
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// fn load_fs() -> Arc<Mutex<Ext2<Size1024, Vec<u8>>>> {
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// let mut volume = Vec::new();
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// volume.extend_from_slice(include_bytes!("../../../userland/root_fs/ext2.img"));
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// Arc::<Ext2<Size1024, _>>::new(volume).unwrap()
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// }
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// pub fn walk<S: SectorSize, V: Volume<u8, S>>(
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// fs: &Synced<Ext2<S, V>>,
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// inode: Inode<S, V>,
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// name: String,
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// ) {
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// if let Some(dir) = inode.directory() {
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// for entry in dir {
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// assert!(entry.is_ok());
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// let entry = entry.unwrap();
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// let entry_name = String::from_utf8_lossy(&entry.name);
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// println!("{}/{} => {}", name, entry_name, entry.inode,);
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// if entry_name != "." && entry_name != ".." {
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// walk(
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// fs,
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// fs.inode_nth(entry.inode).unwrap(),
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// format!("{}/{}", name, entry_name),
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// );
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// }
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// }
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// }
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// }
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