[PATCH 1/1] NFSv4.1/pnfs: error gracefully on partial pnfs layout

From: Olga Kornievskaia <olga.kornievskaia@gmail.com>
To: trond.myklebust@hammerspace.com, anna.schumaker@netapp.com
Cc: linux-nfs@vger.kernel.org
Subject: [PATCH 1/1] NFSv4.1/pnfs: error gracefully on partial pnfs layout
Date: Wed,  7 Feb 2024 13:29:12 -0500	[thread overview]
Message-ID: <20240207182912.30981-1-olga.kornievskaia@gmail.com> (raw)

From: Olga Kornievskaia <kolga@netapp.com>

Currently, if the server returns a partial layout, the client gets
stuck asking for a layout indefinitely. Until we add support for
partial layouts, treat partial layout as layout unavailable error.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
---
 fs/nfs/nfs4proc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index dae4c1b6cc1c..108bc7f3e8c2 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -9790,6 +9790,12 @@ nfs4_proc_layoutget(struct nfs4_layoutget *lgp,
 	if (status != 0)
 		goto out;
 
+	/* Since client does not support partial pnfs layout, then treat
+	 * getting a partial layout as LAYOUTUNAVAILABLE error
+	 */
+	if (lgp->args.range.length != lgp->res.range.length)
+		task->tk_status = -NFS4ERR_LAYOUTUNAVAILABLE;
+
 	if (task->tk_status < 0) {
 		exception->retry = 1;
 		status = nfs4_layoutget_handle_exception(task, lgp, exception);
-- 
2.39.1

