From: Jan Kara Date: Thu, 14 Mar 2013 13:30:54 +0000 (+0100) Subject: xfs: Fix WARN_ON(delalloc) in xfs_vm_releasepage() X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=ff9a28f6c25d18a635abcab1f49db68108203dfb;p=openwrt%2Fstaging%2Fblogic.git xfs: Fix WARN_ON(delalloc) in xfs_vm_releasepage() When a dirty page is truncated from a file but reclaim gets to it before truncate_inode_pages(), we hit WARN_ON(delalloc) in xfs_vm_releasepage(). This is because reclaim tries to write the page, xfs_vm_writepage() just bails out (leaving page clean) and thus reclaim thinks it can continue and calls xfs_vm_releasepage() on page with dirty buffers. Fix the issue by redirtying the page in xfs_vm_writepage(). This makes reclaim stop reclaiming the page and also logically it keeps page in a more consistent state where page with dirty buffers has PageDirty set. Signed-off-by: Jan Kara Reviewed-by: Carlos Maiolino Signed-off-by: Ben Myers --- diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 5f707e537171..3244c988d379 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -953,13 +953,13 @@ xfs_vm_writepage( unsigned offset_into_page = offset & (PAGE_CACHE_SIZE - 1); /* - * Just skip the page if it is fully outside i_size, e.g. due - * to a truncate operation that is in progress. + * Skip the page if it is fully outside i_size, e.g. due to a + * truncate operation that is in progress. We must redirty the + * page so that reclaim stops reclaiming it. Otherwise + * xfs_vm_releasepage() is called on it and gets confused. */ - if (page->index >= end_index + 1 || offset_into_page == 0) { - unlock_page(page); - return 0; - } + if (page->index >= end_index + 1 || offset_into_page == 0) + goto redirty; /* * The page straddles i_size. It must be zeroed out on each