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Date: Mon, 26 Nov 2007 11:44:11 -0500 From: Erez Zadok <ezk@...sunysb.edu> To: akpm@...ux-foundation.org Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, viro@....linux.org.uk, hch@...radead.org, Erez Zadok <ezk@...sunysb.edu>, Hugh Dickins <hugh@...itas.com> Subject: [PATCH 14/16] 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 <hugh@...itas.com> Signed-off-by: Erez Zadok <ezk@...sunysb.edu> --- 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-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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