commit 6d9b3e6a300d27e2b57032ecb5a528cdbc030115
Author: Erez Zadok <[EMAIL PROTECTED]>
Date: Sun Nov 25 18:32:12 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 bfd2cad..9553dac 100644
--- a/fs/unionfs/mmap.c
+++ b/fs/unionfs/mmap.c
@@ -104,6 +104,7 @@ 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);
wbc->for_writepages = saved_for_writepages; /* restore value */
if (err < 0)
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