[PATCH 4.14 85/89] flexfiles: enforce per-mirror stateid only for v4 DSes

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tigran Mkrtchyan <tigran.mkrtchyan@xxxxxxx>

commit 320f35b7bf8cccf1997ca3126843535e1b95e9c4 upstream.

Since commit bb21ce0ad227 we always enforce per-mirror stateid.
However, this makes sense only for v4+ servers.

Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@xxxxxxx>
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/nfs/flexfilelayout/flexfilelayout.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -1725,7 +1725,8 @@ ff_layout_read_pagelist(struct nfs_pgio_
 	if (fh)
 		hdr->args.fh = fh;
 
-	if (!nfs4_ff_layout_select_ds_stateid(lseg, idx, &hdr->args.stateid))
+	if (vers == 4 &&
+		!nfs4_ff_layout_select_ds_stateid(lseg, idx, &hdr->args.stateid))
 		goto out_failed;
 
 	/*
@@ -1790,7 +1791,8 @@ ff_layout_write_pagelist(struct nfs_pgio
 	if (fh)
 		hdr->args.fh = fh;
 
-	if (!nfs4_ff_layout_select_ds_stateid(lseg, idx, &hdr->args.stateid))
+	if (vers == 4 &&
+		!nfs4_ff_layout_select_ds_stateid(lseg, idx, &hdr->args.stateid))
 		goto out_failed;
 
 	/*