xfs: kill VN_CACHED

Only has 2 users, has outlived it's usefulness.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>

fs/xfs/xfs_bmap_util.c

@@ -862,7 +862,7 @@ xfs_can_free_eofblocks(struct xfs_inode *ip, bool force)
 	 * have speculative prealloc/delalloc blocks to remove.
 	 */
 	if (VFS_I(ip)->i_size == 0 &&
-	    VN_CACHED(VFS_I(ip)) == 0 &&
+	    VFS_I(ip)->i_mapping->nrpages == 0 &&
 	    ip->i_delayed_blks == 0)
 		return false;
 
@@ -1720,7 +1720,7 @@ xfs_swap_extents(
 	truncate_pagecache_range(VFS_I(tip), 0, -1);
 
 	/* Verify O_DIRECT for ftmp */
-	if (VN_CACHED(VFS_I(tip)) != 0) {
+	if (VFS_I(tip)->i_mapping->nrpages) {
 		error = -EINVAL;
 		goto out_unlock;
 	}

fs/xfs/xfs_vnode.h

@@ -38,7 +38,6 @@ struct attrlist_cursor_kern;
  * Some useful predicates.
  */
 #define VN_MAPPED(vp)	mapping_mapped(vp->i_mapping)
-#define VN_CACHED(vp)	(vp->i_mapping->nrpages)
 
 
 #endif	/* __XFS_VNODE_H__ */