[PATCH 4.17 025/336] NFSv4.1: Fix the client behaviour on NFS4ERR_SEQ_FALSE_RETRY

From: Greg Kroah-Hartman
Date: Wed Aug 01 2018 - 13:35:12 EST


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

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

From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>

[ Upstream commit f9312a541050007ec59eb0106273a0a10718cd83 ]

If the server returns NFS4ERR_SEQ_FALSE_RETRY or NFS4ERR_RETRY_UNCACHED_REP,
then it thinks we're trying to replay an existing request. If so, then
let's just bump the sequence ID and retry the operation.

Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfs/nfs4proc.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -746,6 +746,13 @@ static int nfs41_sequence_process(struct
slot->slot_nr,
slot->seq_nr);
goto out_retry;
+ case -NFS4ERR_RETRY_UNCACHED_REP:
+ case -NFS4ERR_SEQ_FALSE_RETRY:
+ /*
+ * The server thinks we tried to replay a request.
+ * Retry the call after bumping the sequence ID.
+ */
+ goto retry_new_seq;
case -NFS4ERR_BADSLOT:
/*
* The slot id we used was probably retired. Try again
@@ -770,10 +777,6 @@ static int nfs41_sequence_process(struct
goto retry_nowait;
}
goto session_recover;
- case -NFS4ERR_SEQ_FALSE_RETRY:
- if (interrupted)
- goto retry_new_seq;
- goto session_recover;
default:
/* Just update the slot sequence no. */
slot->seq_done = 1;