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]>
---
fs/unionfs/mmap.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
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;
--
1.5.2.2
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