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[PATCH] fix race in pagevec_strip?

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We can call try_to_release_page() with PagePrivate off and a valid
page->mapping This may cause all sorts of trouble for the filesystem
*_releasepage() handlers.  XFS bombs out in that case.

Lock the page before checking for page private.

Signed-off-by: Christoph Lameter <[email protected]>
Cc: Nick Piggin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christoph Lameter 2006-03-16 23:04:07 -08:00 • committed by Linus Torvalds
commit 5b40dc780e
1 changed files with 2 additions and 1 deletions
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3
mm/swap.c
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@ -393,7 +393,8 @@ void pagevec_strip(struct pagevec *pvec)
struct page *page = pvec->pages[i];
if (PagePrivate(page) && !TestSetPageLocked(page)) {
try_to_release_page(page, 0);
if (PagePrivate(page))
try_to_release_page(page, 0);
unlock_page(page);
}
}