96 lines
2.4 KiB
Rust
96 lines
2.4 KiB
Rust
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use core::any::Any;
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use alloc::{string::String, sync::Arc, vec::Vec};
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use libk::{
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block,
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error::Error,
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vfs::{CommonImpl, Metadata, Node, NodeFlags, NodeRef, SymlinkImpl},
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};
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use libk_util::sync::spin_rwlock::IrqSafeRwLock;
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use crate::{Ext2Fs, Inode};
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pub struct SymlinkNode {
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fs: Arc<Ext2Fs>,
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inode: Inode,
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#[allow(unused)]
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ino: u32,
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cache: IrqSafeRwLock<Vec<u8>>,
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}
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impl SymlinkNode {
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pub fn new(fs: Arc<Ext2Fs>, inode: Inode, ino: u32) -> NodeRef {
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Node::symlink(
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Self {
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fs,
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inode,
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ino,
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cache: IrqSafeRwLock::new(Vec::new()),
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},
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NodeFlags::empty(),
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)
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}
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async fn read(&self, buf: &mut [u8]) -> Result<usize, Error> {
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let len = self.inode.size_lower as usize;
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if len >= self.fs.block_size {
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todo!()
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}
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let mut write = self.cache.write();
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write.clear();
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// If length of symlink is lower than 60, data is stored directly in "block address"
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// section of the inode
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if len < 60 {
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let bytes = unsafe { self.link_from_inode_blocks(len) };
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write.extend_from_slice(bytes);
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buf[..len].copy_from_slice(bytes);
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} else {
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let block = self.fs.inode_block(&self.inode, 0).await?;
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write.extend_from_slice(&block[..len]);
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buf[..len].copy_from_slice(&block[..len]);
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}
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Ok(len)
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}
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unsafe fn link_from_inode_blocks(&self, len: usize) -> &[u8] {
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debug_assert!(len < 60);
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&bytemuck::bytes_of(&self.inode.blocks)[..len]
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}
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}
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impl CommonImpl for SymlinkNode {
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fn size(&self, node: &NodeRef) -> Result<u64, Error> {
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Ok(self.inode.size_lower as _)
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}
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fn as_any(&self) -> &dyn Any {
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self
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}
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fn metadata(&self, node: &NodeRef) -> Result<Metadata, Error> {
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Ok(self.inode.metadata())
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}
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}
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impl SymlinkImpl for SymlinkNode {
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fn read_link(&self, buf: &mut [u8]) -> Result<usize, Error> {
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if buf.len() < self.inode.size_lower as usize {
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todo!()
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}
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{
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let read = self.cache.read();
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if !read.is_empty() {
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buf[..read.len()].copy_from_slice(&read[..]);
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return Ok(read.len());
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}
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}
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block!(self.read(buf).await)?
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}
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}
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