Seems that simple_prepare_write() may occasionally be called for a page that does not have a mapping yet. Retrieve the page size from the page instead of the mapping. Signed-off-by: Christoph Lameter --- fs/libfs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) Index: linux-2.6/fs/libfs.c =================================================================== --- linux-2.6.orig/fs/libfs.c 2007-09-05 01:22:02.000000000 -0700 +++ linux-2.6/fs/libfs.c 2007-09-05 01:52:34.000000000 -0700 @@ -341,10 +341,10 @@ int simple_prepare_write(struct file *fi unsigned from, unsigned to) { if (!PageUptodate(page)) { - if (to - from != page_cache_size(file->f_mapping)) + if (to - from != page_cache_page_size(page)) zero_user_segments(page, 0, from, - to, page_cache_size(file->f_mapping)); + to, page_cache_page_size(page)); } return 0; } -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/