[PATCH 6.4 476/737] NFSv4.2: fix handling of COPY ERR_OFFLOAD_NO_REQ

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

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

From: Olga Kornievskaia <kolga@xxxxxxxxxx>

[ Upstream commit 5690eed941ab7e33c3c3d6b850100cabf740f075 ]

If the client sent a synchronous copy and the server replied with
ERR_OFFLOAD_NO_REQ indicating that it wants an asynchronous
copy instead, the client should retry with asynchronous copy.

Fixes: 539f57b3e0fd ("NFS handle COPY ERR_OFFLOAD_NO_REQS")
Signed-off-by: Olga Kornievskaia <kolga@xxxxxxxxxx>
Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/nfs/nfs42proc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index 5d7e0511f3513..d5ec3d5568da5 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -471,8 +471,9 @@ ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
 				continue;
 			}
 			break;
-		} else if (err == -NFS4ERR_OFFLOAD_NO_REQS && !args.sync) {
-			args.sync = true;
+		} else if (err == -NFS4ERR_OFFLOAD_NO_REQS &&
+				args.sync != res.synchronous) {
+			args.sync = res.synchronous;
 			dst_exception.retry = 1;
 			continue;
 		} else if ((err == -ESTALE ||
-- 
2.40.1






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