nfsd4: clean up validate_stateid

The logic here is better expressed with a switch statement.

While we're here, CLOSED stateids (or stateids of an unkown type--which
would indicate a server bug) should probably return nfserr_bad_stateid,
though this behavior shouldn't affect any non-buggy client.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 14 insertions, 5 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 67017fcebb21..add9721ab059 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3456,13 +3456,22 @@ static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
         status = check_stateid_generation(stateid, &s->sc_stateid, 1);
         if (status)
                 return status;
-        if (!(s->sc_type & (NFS4_OPEN_STID | NFS4_LOCK_STID)))
+        switch (s->sc_type) {
+        case NFS4_DELEG_STID:
+                return nfs_ok;
+        case NFS4_OPEN_STID:
+        case NFS4_LOCK_STID:
+                ols = openlockstateid(s);
+                if (ols->st_stateowner->so_is_open_owner
+                                && !(openowner(ols->st_stateowner)->oo_flags
+                                                & NFS4_OO_CONFIRMED))
+                        return nfserr_bad_stateid;
                 return nfs_ok;
-        ols = openlockstateid(s);
-        if (ols->st_stateowner->so_is_open_owner
-            && !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
+        default:
+                printk("unknown stateid type %x\n", s->sc_type);
+        case NFS4_CLOSED_STID:
                 return nfserr_bad_stateid;
-        return nfs_ok;
+        }
 }
 
 static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask,