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NFSv4.1: freeze the session table upon receiving NFS4ERR_BADSESSION

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[ Upstream commit c907e72f58 ]

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: 5c441544f0 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Olga Kornievskaia
2023-06-18 17:32:25 -04:00
committed by Greg Kroah-Hartman
parent 7053178436
commit c2bf8d7b8f
1 changed files with 1 additions and 0 deletions
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1
fs/nfs/nfs4proc.c
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@@ -921,6 +921,7 @@ out:
out_noaction: out_noaction:
return ret; return ret;
session_recover: session_recover:
set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state);
nfs4_schedule_session_recovery(session, status); nfs4_schedule_session_recovery(session, status);
dprintk("%s ERROR: %d Reset session\n", __func__, status); dprintk("%s ERROR: %d Reset session\n", __func__, status);
nfs41_sequence_free_slot(res); nfs41_sequence_free_slot(res);