From: Olga Kornievskaia <kolga@netapp.com>
Date: Sun, 18 Jun 2023 21:32:25 +0000 (-0400)
Subject: NFSv4.1: freeze the session table upon receiving NFS4ERR_BADSESSION
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c907e72f58ed979a24a9fdcadfbc447c51d5e509;p=linux.git

NFSv4.1: freeze the session table upon receiving NFS4ERR_BADSESSION

When the client received NFS4ERR_BADSESSION, it schedules recovery
and start the state manager thread which in turn freezes the
session table and does not allow for any new requests to use the
no-longer valid session. However, it is possible that before
the state manager thread runs, a new operation would use the
released slot that received BADSESSION and was therefore not
updated its sequence number. Such re-use of the slot can lead
the application errors.

Fixes: 5c441544f045 ("NFSv4.x: Handle bad/dead sessions correctly in nfs41_sequence_process()")
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 6fcee85e30cae..212971ddb1491 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -921,6 +921,7 @@ out:
 out_noaction:
 	return ret;
 session_recover:
+	set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state);
 	nfs4_schedule_session_recovery(session, status);
 	dprintk("%s ERROR: %d Reset session\n", __func__, status);
 	nfs41_sequence_free_slot(res);