nfsd4: consolidate lock & open stateid tables

There's no reason to have two separate hash tables for open and lock
stateid's.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4state.c

@@ -61,7 +61,6 @@ static u64 current_sessionid = 1;
 
 /* forward declarations */
 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
-static struct nfs4_stateid * search_for_stateid(stateid_t *stid);
 static struct nfs4_delegation * search_for_delegation(stateid_t *stid);
 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
 static int check_for_locks(struct nfs4_file *filp, struct nfs4_stateowner *lowner);
@@ -3211,7 +3210,7 @@ __be32 nfs4_validate_stateid(stateid_t *stateid, bool has_session)
 		goto out;
 
 	status = nfserr_expired;
-	stp = search_for_stateid(stateid);
+	stp = find_stateid(stateid, 0);
 	if (!stp)
 		goto out;
 	status = nfserr_bad_stateid;
@@ -3349,7 +3348,7 @@ nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 		goto out;
 	}
 
-	stp = search_for_stateid(stateid);
+	stp = find_stateid(stateid, 0);
 	if (!stp) {
 		ret = nfserr_bad_stateid;
 		goto out;
@@ -3718,7 +3717,6 @@ lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
 
 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
 static struct list_head	lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
-static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
 
 static int
 same_stateid(stateid_t *id_one, stateid_t *id_two)
@@ -3728,50 +3726,21 @@ same_stateid(stateid_t *id_one, stateid_t *id_two)
 	return id_one->si_fileid == id_two->si_fileid;
 }
 
-static struct nfs4_stateid *
-find_stateid(stateid_t *stid, int flags)
+static struct nfs4_stateid *find_stateid(stateid_t *t, int flags)
 {
-	struct nfs4_stateid *local;
-	u32 st_id = stid->si_stateownerid;
-	u32 f_id = stid->si_fileid;
+	struct nfs4_stateid *s;
 	unsigned int hashval;
 
-	dprintk("NFSD: find_stateid flags 0x%x\n",flags);
-	if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
-		hashval = stateid_hashval(st_id, f_id);
-		list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
-			if ((local->st_stateid.si_stateownerid == st_id) &&
-			    (local->st_stateid.si_fileid == f_id))
-				return local;
-		}
-	} 
-
-	if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
-		hashval = stateid_hashval(st_id, f_id);
-		list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
-			if ((local->st_stateid.si_stateownerid == st_id) &&
-			    (local->st_stateid.si_fileid == f_id))
-				return local;
+	hashval = stateid_hashval(t->si_stateownerid, t->si_fileid);
+	list_for_each_entry(s, &stateid_hashtbl[hashval], st_hash) {
+		if (!same_stateid(&s->st_stateid, t))
+			continue;
+		if (flags & LOCK_STATE && s->st_type != NFS4_LOCK_STID)
+			return NULL;
+		if (flags & OPEN_STATE && s->st_type != NFS4_OPEN_STID)
+			return NULL;
+		return s;
 		}
-	}
-	return NULL;
-}
-
-static struct nfs4_stateid *
-search_for_stateid(stateid_t *stid)
-{
-	struct nfs4_stateid *local;
-	unsigned int hashval = stateid_hashval(stid->si_stateownerid, stid->si_fileid);
-
-	list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
-		if (same_stateid(&local->st_stateid, stid))
-			return local;
-	}
-
-	list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
-		if (same_stateid(&local->st_stateid, stid))
-			return local;
-	}
 	return NULL;
 }
 
@@ -3920,7 +3889,7 @@ alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struc
 	INIT_LIST_HEAD(&stp->st_perfile);
 	INIT_LIST_HEAD(&stp->st_perstateowner);
 	INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
-	list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
+	list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
 	list_add(&stp->st_perfile, &fp->fi_stateids);
 	list_add(&stp->st_perstateowner, &sop->so_stateids);
 	stp->st_stateowner = sop;
@@ -4497,10 +4466,8 @@ nfs4_state_init(void)
 		INIT_LIST_HEAD(&open_ownerstr_hashtbl[i]);
 		INIT_LIST_HEAD(&open_ownerid_hashtbl[i]);
 	}
-	for (i = 0; i < STATEID_HASH_SIZE; i++) {
+	for (i = 0; i < STATEID_HASH_SIZE; i++)
 		INIT_LIST_HEAD(&stateid_hashtbl[i]);
-		INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
-	}
 	for (i = 0; i < LOCK_HASH_SIZE; i++) {
 		INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
 		INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);