Without this patch, the LTP fs test "rwtest04" triggers a BUG_ON(PageWriteback(page)) in fs/buffer.c:1706. CC: Hugh Dickins <hugh@xxxxxxxxxxx> Signed-off-by: Erez Zadok <ezk@xxxxxxxxxxxxx> --- 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 - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
