pNFS/filelayout: treat GETDEVICEINFO errors as layout failure

When GETDEVICEINFO call fails, return the layout and fall back to MDS.
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

fs/nfs/filelayout/filelayout.c

@@ -862,6 +862,8 @@ fl_pnfs_update_layout(struct inode *ino,
 
 	status = filelayout_check_deviceid(lo, fl, gfp_flags);
 	if (status) {
+		pnfs_error_mark_layout_for_return(ino, lseg);
+		pnfs_set_lo_fail(lseg);
 		pnfs_put_lseg(lseg);
 		lseg = NULL;
 	}

fs/nfs/pnfs.c

@@ -511,7 +511,7 @@ pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
 
 	spin_lock(&inode->i_lock);
 	pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
-	pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
+	pnfs_mark_matching_lsegs_return(lo, &head, &range, 0);
 	spin_unlock(&inode->i_lock);
 	pnfs_free_lseg_list(&head);
 	dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,