In message <[email protected]>, Hugh Dickins writes:
> On Mon, 26 Nov 2007, Erez Zadok wrote:
[...]
> > The small patch below fixed the problem. Let me know what you think.
>
> I've one issue with it: please move that wait_on_page_writeback before
> the clear_page_dirty_for_io instead of after it, then resubmit your 14/16.
[...]
Done, tested, and working. Here's the revised patch (pushed to unionfs.git
on korg).
Thanks,
Erez.
------------------------------------------------------------------------------
Unionfs: prevent multiple writers to lower_page
Without this patch, the LTP fs test "rwtest04" triggers a
BUG_ON(PageWriteback(page)) in fs/buffer.c:1706.
CC: Hugh Dickins <[email protected]>
Signed-off-by: Erez Zadok <[email protected]>
diff --git a/fs/unionfs/mmap.c b/fs/unionfs/mmap.c
index 623a913..74f2e53 100644
--- a/fs/unionfs/mmap.c
+++ b/fs/unionfs/mmap.c
@@ -72,6 +72,7 @@ static int unionfs_writepage(struct page *page, struct writeback_control *wbc)
}
BUG_ON(!lower_mapping->a_ops->writepage);
+ wait_on_page_writeback(lower_page); /* prevent multiple writers */
clear_page_dirty_for_io(lower_page); /* emulate VFS behavior */
err = lower_mapping->a_ops->writepage(lower_page, wbc);
if (err < 0)
-
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