commit 35a36c2e4b5195309b986af64b16e7b07ecc5731
Author: Erez Zadok <[EMAIL PROTECTED]>
Date: Sun Nov 25 18:36:03 2007 -0500
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 ff2f006..7fc0e9b 100644
--- a/fs/unionfs/mmap.c
+++ b/fs/unionfs/mmap.c
@@ -100,6 +100,7 @@ static int unionfs_writepage(struct page *page, struct
writeback_control *wbc)
BUG_ON(!lower_mapping->a_ops->writepage);
clear_page_dirty_for_io(lower_page); /* emulate VFS behavior */
+ wait_on_page_writeback(lower_page); /* prevent multiple writers */
err = lower_mapping->a_ops->writepage(lower_page, wbc);
if (err < 0)
goto out_release;
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