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Fix the concurrency bug when multiple threads committing the same page

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This commit is contained in:
Yingdi Shan
2024-06-07 13:55:18 +08:00
committed by Tate, Hongliang Tian
parent 840729d960
commit cea4fd7777
1 changed files with 4 additions and 4 deletions
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8
kernel/aster-nix/src/fs/utils/page_cache.rs
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@ -156,7 +156,7 @@ impl Pager for PageCacheManager {
return Ok(page.frame.clone());
}
//Multiple threads may commit the same page, but the result is ok.
// Multiple threads may commit the same page, but the result is ok.
let backend = self.backend();
let page = if idx < backend.npages() {
let mut page = Page::alloc()?;
@ -167,9 +167,9 @@ impl Pager for PageCacheManager {
} else {
Page::alloc_zero()?
};
let frame = page.frame().clone();
self.pages.lock().put(idx, page);
Ok(frame)
// If multiple threads commit the same page, only the first allocated page will be perserved.
Ok(self.pages.lock().get_or_insert(idx, || page).frame.clone())
}
fn update_page(&self, idx: usize) -> Result<()> {