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Optimize the DirEntry lookup in ext2

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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. /// A reader for reading `DirEntry` from the page cache.
pub struct DirEntryReader<'a> { pub struct DirEntryReader<'a> {
page_cache: &'a PageCache, page_cache: &'a PageCache,
name_buf: [u8; MAX_FNAME_LEN],
offset: usize, offset: usize,
} }
@ -164,6 +165,7 @@ impl<'a> DirEntryReader<'a> {
pub(super) fn new(page_cache: &'a PageCache, from_offset: usize) -> Self { pub(super) fn new(page_cache: &'a PageCache, from_offset: usize) -> Self {
Self { Self {
page_cache, page_cache,
name_buf: [0u8; MAX_FNAME_LEN],
offset: from_offset, offset: from_offset,
} }
} }
@ -178,13 +180,14 @@ impl<'a> DirEntryReader<'a> {
return_errno!(Errno::ENOENT); return_errno!(Errno::ENOENT);
} }
let mut name = vec![0u8; header.name_len as _]; let name_len = header.name_len as usize;
self.page_cache self.page_cache.pages().read_bytes(
.pages() self.offset + DirEntry::header_len(),
.read_bytes(self.offset + DirEntry::header_len(), &mut name)?; &mut self.name_buf[..name_len],
)?;
let entry = DirEntry { let entry = DirEntry {
header, header,
name: CStr256::from(name.as_slice()), name: CStr256::from(&self.name_buf[..name_len]),
}; };
self.offset += entry.record_len(); self.offset += entry.record_len();
@ -214,6 +217,7 @@ pub struct DirEntryWriter<'a> {
offset: usize, offset: usize,
} }
// TODO: Improve the efficiency of the writer operations.
impl<'a> DirEntryWriter<'a> { impl<'a> DirEntryWriter<'a> {
/// Constructs a writer with the given page cache and offset. /// Constructs a writer with the given page cache and offset.
pub(super) fn new(page_cache: &'a PageCache, from_offset: usize) -> Self { pub(super) fn new(page_cache: &'a PageCache, from_offset: usize) -> Self {