return (mask && (page->private & mask) == mask); 
return (mask && (page_private(page) & mask) == mask); 
test_page_region(	struct page	*page,	size_t		offset,	size_t		length){	unsigned long	mask = page_region_mask(offset, length);	return (mask && (page->private & mask) == mask);}
10457	/local/tlutelli/issta_data/temp/c/2005_temp/2005/10457/4c21e2f2441dc5fbb957b030333f5a3f2d02dea7/xfs_buf.c/clean/fs/xfs/linux-2.6/xfs_buf.c