NFS: Mask out unsupported attributes in nfs_getattr()

We don't currently support STATX_BTIME, so don't advertise it in the
return values for nfs_getattr().
Signed-off-by: NTrond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/inode.c

@@ -815,6 +815,10 @@ int nfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
 
 	trace_nfs_getattr_enter(inode);
 
+	request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID |
+			STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME |
+			STATX_INO | STATX_SIZE | STATX_BLOCKS;
+
 	if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
 		nfs_readdirplus_parent_cache_hit(path->dentry);
 		goto out_no_update;