commit 5268a572ff0697c36ca1bc6fa4277fcf791a3ce9
Author: Erez Zadok <[EMAIL PROTECTED]>
Date: Sun Nov 25 14:51:56 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 623a913..ea5ef3d 100644
--- a/fs/unionfs/mmap.c
+++ b/fs/unionfs/mmap.c
@@ -73,6 +73,7 @@ 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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