NFSv4: Fix up handling of open_to_lock sequence ids

Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4proc.c

@@ -2889,11 +2889,23 @@ static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *r
 	struct inode *inode = state->inode;
 	struct nfs_server *server = NFS_SERVER(inode);
 	struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
+	struct nfs_lock_opargs largs = {
+		.lock_stateid = &lsp->ls_stateid,
+		.open_stateid = &state->stateid,
+		.lock_owner = {
+			.clientid = server->nfs4_state->cl_clientid,
+			.id = lsp->ls_id,
+		},
+		.reclaim = reclaim,
+	};
 	struct nfs_lockargs arg = {
 		.fh = NFS_FH(inode),
 		.type = nfs4_lck_type(cmd, request),
 		.offset = request->fl_start,
 		.length = nfs4_lck_length(request),
+		.u = {
+			.lock = &largs,
+		},
 	};
 	struct nfs_lockres res = {
 		.server = server,
@@ -2904,56 +2916,39 @@ static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *r
 		.rpc_resp       = &res,
 		.rpc_cred	= state->owner->so_cred,
 	};
-	struct nfs_lock_opargs largs = {
-		.reclaim = reclaim,
-		.new_lock_owner = 0,
-	};
-	struct nfs_seqid *lock_seqid;
 	int status = -ENOMEM;
 
-	lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
-	if (lock_seqid == NULL)
+	largs.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
+	if (largs.lock_seqid == NULL)
 		return -ENOMEM;
 	if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
 		struct nfs4_state_owner *owner = state->owner;
-		struct nfs_open_to_lock otl = {
-			.lock_owner = {
-				.clientid = server->nfs4_state->cl_clientid,
-			},
-		};
-
-		otl.lock_seqid = lock_seqid;
-		otl.lock_owner.id = lsp->ls_id;
-		memcpy(&otl.open_stateid, &state->stateid, sizeof(otl.open_stateid));
-		largs.u.open_lock = &otl;
+
+		largs.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
+		if (largs.open_seqid == NULL)
+			goto out;
 		largs.new_lock_owner = 1;
-		arg.u.lock = &largs;
-		otl.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
-		if (otl.open_seqid != NULL) {
-			status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
-			/* increment seqid on success, and seqid mutating errors */
-			nfs_increment_open_seqid(status, otl.open_seqid);
-			nfs_free_seqid(otl.open_seqid);
+		status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
+		/* increment open seqid on success, and seqid mutating errors */
+		if (largs.new_lock_owner != 0) {
+			nfs_increment_open_seqid(status, largs.open_seqid);
+			if (status == 0)
+				nfs_confirm_seqid(&lsp->ls_seqid, 0);
 		}
-		if (status == 0)
-			nfs_confirm_seqid(&lsp->ls_seqid, 0);
-	} else {
-		struct nfs_exist_lock el;
-		memcpy(&el.stateid, &lsp->ls_stateid, sizeof(el.stateid));
-		largs.u.exist_lock = ⪙
-		arg.u.lock = &largs;
-		el.seqid = lock_seqid;
+		nfs_free_seqid(largs.open_seqid);
+	} else
 		status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
-	}
-	/* increment seqid on success, and seqid mutating errors*/
-	nfs_increment_lock_seqid(status, lock_seqid);
+	/* increment lock seqid on success, and seqid mutating errors*/
+	nfs_increment_lock_seqid(status, largs.lock_seqid);
 	/* save the returned stateid. */
 	if (status == 0) {
-		memcpy(lsp->ls_stateid.data, res.u.stateid.data, sizeof(lsp->ls_stateid.data));
+		memcpy(lsp->ls_stateid.data, res.u.stateid.data,
+				sizeof(lsp->ls_stateid.data));
 		lsp->ls_flags |= NFS_LOCK_INITIALIZED;
 	} else if (status == -NFS4ERR_DENIED)
 		status = -EAGAIN;
-	nfs_free_seqid(lock_seqid);
+out:
+	nfs_free_seqid(largs.lock_seqid);
 	return status;
 }
 

fs/nfs/nfs4xdr.c

@@ -729,22 +729,18 @@ static int encode_lock(struct xdr_stream *xdr, const struct nfs_lockargs *arg)
 	WRITE64(arg->length);
 	WRITE32(opargs->new_lock_owner);
 	if (opargs->new_lock_owner){
-		struct nfs_open_to_lock *ol = opargs->u.open_lock;
-
 		RESERVE_SPACE(40);
-		WRITE32(ol->open_seqid->sequence->counter);
-		WRITEMEM(&ol->open_stateid, sizeof(ol->open_stateid));
-		WRITE32(ol->lock_seqid->sequence->counter);
-		WRITE64(ol->lock_owner.clientid);
+		WRITE32(opargs->open_seqid->sequence->counter);
+		WRITEMEM(opargs->open_stateid->data, sizeof(opargs->open_stateid->data));
+		WRITE32(opargs->lock_seqid->sequence->counter);
+		WRITE64(opargs->lock_owner.clientid);
 		WRITE32(4);
-		WRITE32(ol->lock_owner.id);
+		WRITE32(opargs->lock_owner.id);
 	}
 	else {
-		struct nfs_exist_lock *el = opargs->u.exist_lock;
-
 		RESERVE_SPACE(20);
-		WRITEMEM(&el->stateid, sizeof(el->stateid));
-		WRITE32(el->seqid->sequence->counter);
+		WRITEMEM(opargs->lock_stateid->data, sizeof(opargs->lock_stateid->data));
+		WRITE32(opargs->lock_seqid->sequence->counter);
 	}
 
 	return 0;
@@ -1535,16 +1531,14 @@ static int nfs4_xdr_enc_lock(struct rpc_rqst *req, uint32_t *p, struct nfs_locka
 		.nops   = 2,
 	};
 	struct nfs_lock_opargs *opargs = args->u.lock;
-	struct nfs_seqid *seqid;
 	int status;
 
-	if (opargs->new_lock_owner)
-		seqid = opargs->u.open_lock->lock_seqid;
-	else
-		seqid = opargs->u.exist_lock->seqid;
-	status = nfs_wait_on_sequence(seqid, req->rq_task);
+	status = nfs_wait_on_sequence(opargs->lock_seqid, req->rq_task);
 	if (status != 0)
 		goto out;
+	/* Do we need to do an open_to_lock_owner? */
+	if (opargs->lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)
+		opargs->new_lock_owner = 0;
 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
 	encode_compound_hdr(&xdr, &hdr);
 	status = encode_putfh(&xdr, args->fh);
@@ -2908,8 +2902,8 @@ static int decode_lock(struct xdr_stream *xdr, struct nfs_lockres *res)
 
 	status = decode_op_hdr(xdr, OP_LOCK);
 	if (status == 0) {
-		READ_BUF(sizeof(nfs4_stateid));
-		COPYMEM(&res->u.stateid, sizeof(res->u.stateid));
+		READ_BUF(sizeof(res->u.stateid.data));
+		COPYMEM(res->u.stateid.data, sizeof(res->u.stateid.data));
 	} else if (status == -NFS4ERR_DENIED)
 		return decode_lock_denied(xdr, &res->u.denied);
 	return status;

include/linux/nfs_xdr.h

@@ -165,25 +165,14 @@ struct nfs_lowner {
 	u32                     id;
 };
 
-struct nfs_open_to_lock {
-	struct nfs_seqid *	open_seqid;
-	nfs4_stateid            open_stateid;
+struct nfs_lock_opargs {
 	struct nfs_seqid *	lock_seqid;
+	nfs4_stateid *		lock_stateid;
+	struct nfs_seqid *	open_seqid;
+	nfs4_stateid *		open_stateid;
 	struct nfs_lowner       lock_owner;
-};
-
-struct nfs_exist_lock {
-	nfs4_stateid            stateid;
-	struct nfs_seqid *	seqid;
-};
-
-struct nfs_lock_opargs {
 	__u32                   reclaim;
 	__u32                   new_lock_owner;
-	union {
-		struct nfs_open_to_lock *open_lock;
-		struct nfs_exist_lock   *exist_lock;
-	} u;
 };
 
 struct nfs_locku_opargs {