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Optimize the DirEntry lookup in ext2

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This commit is contained in:
Shaowei Song 2024-12-19 14:42:32 +00:00 committed by Tate, Hongliang Tian
parent 21da6d2b93
commit 104c8dfdde
1 changed files with 9 additions and 5 deletions
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14
kernel/src/fs/ext2/dir.rs
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@ -156,6 +156,7 @@ impl From<DirEntryFileType> for InodeType {
/// A reader for reading `DirEntry` from the page cache.
pub struct DirEntryReader<'a> {
page_cache: &'a PageCache,
name_buf: [u8; MAX_FNAME_LEN],
offset: usize,
}
@ -164,6 +165,7 @@ impl<'a> DirEntryReader<'a> {
pub(super) fn new(page_cache: &'a PageCache, from_offset: usize) -> Self {
Self {
page_cache,
name_buf: [0u8; MAX_FNAME_LEN],
offset: from_offset,
}
}
@ -178,13 +180,14 @@ impl<'a> DirEntryReader<'a> {
return_errno!(Errno::ENOENT);
}
let mut name = vec![0u8; header.name_len as _];
self.page_cache
.pages()
.read_bytes(self.offset + DirEntry::header_len(), &mut name)?;
let name_len = header.name_len as usize;
self.page_cache.pages().read_bytes(
self.offset + DirEntry::header_len(),
&mut self.name_buf[..name_len],
)?;
let entry = DirEntry {
header,
name: CStr256::from(name.as_slice()),
name: CStr256::from(&self.name_buf[..name_len]),
};
self.offset += entry.record_len();
@ -214,6 +217,7 @@ pub struct DirEntryWriter<'a> {
offset: usize,
}
// TODO: Improve the efficiency of the writer operations.
impl<'a> DirEntryWriter<'a> {
/// Constructs a writer with the given page cache and offset.
pub(super) fn new(page_cache: &'a PageCache, from_offset: usize) -> Self {