nfsd: Ensure we check stateid validity in the seqid operation checks

After taking the stateid st_mutex, we want to know that the stateid
still represents valid state before performing any non-idempotent
actions.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 6d5993c..da07c24 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -5234,15 +5234,9 @@ static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_
        status = nfsd4_check_seqid(cstate, sop, seqid);
        if (status)
                return status;
-       if (stp->st_stid.sc_type == NFS4_CLOSED_STID
-               || stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID)
-               /*
-                * "Closed" stateid's exist *only* to return
-                * nfserr_replay_me from the previous step, and
-                * revoked delegations are kept only for free_stateid.
-                */
-               return nfserr_bad_stateid;
-       mutex_lock(&stp->st_mutex);
+       status = nfsd4_lock_ol_stateid(stp);
+       if (status != nfs_ok)
+               return status;
        status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
        if (status == nfs_ok)
                status = nfs4_check_fh(current_fh, &stp->st_stid);