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From:   Olga Kornievskaia <olga.kornievskaia@gmail.com>
To:     trond.myklebust@hammerspace.com, anna.schumaker@netapp.com,
        bfields@redhat.com
Cc:     linux-nfs@vger.kernel.org
Subject: [PATCH v7 07/19] NFS: for "inter" copy treat ESTALE as ENOTSUPP
Date:   Mon, 16 Sep 2019 17:13:41 -0400
Message-Id: <20190916211353.18802-8-olga.kornievskaia@gmail.com>
In-Reply-To: <20190916211353.18802-1-olga.kornievskaia@gmail.com>
References: <20190916211353.18802-1-olga.kornievskaia@gmail.com>
Sender: linux-nfs-owner@vger.kernel.org
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From: Olga Kornievskaia <kolga@netapp.com>

If the client sends an "inter" copy to the destination server but
it only supports "intra" copy, it can return ESTALE (since it
doesn't know anything about the file handle from the other server
and does not recognize the special case of "inter" copy). Translate
this error as ENOTSUPP and also send OFFLOAD_CANCEL to the source
server so that it can clean up state.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
---
 fs/nfs/nfs42proc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index bbf7c1e..f8ebd77 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -393,6 +393,11 @@ ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
 			args.sync = true;
 			dst_exception.retry = 1;
 			continue;
+		} else if (err == -ESTALE &&
+				!nfs42_files_from_same_server(src, dst)) {
+			nfs42_do_offload_cancel_async(src, &args.src_stateid);
+			err = -EOPNOTSUPP;
+			break;
 		}
 
 		err2 = nfs4_handle_exception(server, err, &src_exception);
-- 
1.8.3.1