nfsd4: extend state lock over seqid replay logic
There are currently a couple races in the seqid replay code: a
retransmission could come while we're still encoding the original reply,
or a new seqid-mutating call could come as we're encoding a replay.
So, extend the state lock over the encoding (both encoding of a replayed
reply and caching of the original encoded reply).
I really hate doing this, and previously added the stateowner
reference-counting code to avoid it (which was insufficient)--but I
don't see a less complicated alternative at the moment.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 50bae74..50063a8 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -408,8 +408,8 @@
if (open->op_stateowner) {
nfs4_get_stateowner(open->op_stateowner);
cstate->replay_owner = open->op_stateowner;
- }
- nfs4_unlock_state();
+ } else
+ nfs4_unlock_state();
return status;
}
@@ -1227,6 +1227,7 @@
be32_to_cpu(status));
if (cstate->replay_owner) {
+ nfs4_unlock_state();
nfs4_put_stateowner(cstate->replay_owner);
cstate->replay_owner = NULL;
}