1 files changed, 82 insertions, 0 deletions
diff --git a/fs/nfsd/lockd.c b/fs/nfsd/lockd.c
new file mode 100644
index 0000000000..46a7f9b813
--- /dev/null
+++ b/fs/nfsd/lockd.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * This file contains all the stubs needed when communicating with lockd.
+ * This level of indirection is necessary so we can run nfsd+lockd without
+ * requiring the nfs client to be compiled in/loaded, and vice versa.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/file.h>
+#include <linux/lockd/bind.h>
+#include "nfsd.h"
+#include "vfs.h"
+
+#define NFSDDBG_FACILITY		NFSDDBG_LOCKD
+
+#ifdef CONFIG_LOCKD_V4
+#define nlm_stale_fh	nlm4_stale_fh
+#define nlm_failed	nlm4_failed
+#else
+#define nlm_stale_fh	nlm_lck_denied_nolocks
+#define nlm_failed	nlm_lck_denied_nolocks
+#endif
+/*
+ * Note: we hold the dentry use count while the file is open.
+ */
+static __be32
+nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp,
+		int mode)
+{
+	__be32		nfserr;
+	int		access;
+	struct svc_fh	fh;
+
+	/* must initialize before using! but maxsize doesn't matter */
+	fh_init(&fh,0);
+	fh.fh_handle.fh_size = f->size;
+	memcpy(&fh.fh_handle.fh_raw, f->data, f->size);
+	fh.fh_export = NULL;
+
+	access = (mode == O_WRONLY) ? NFSD_MAY_WRITE : NFSD_MAY_READ;
+	access |= NFSD_MAY_LOCK;
+	nfserr = nfsd_open(rqstp, &fh, S_IFREG, access, filp);
+	fh_put(&fh);
+ 	/* We return nlm error codes as nlm doesn't know
+	 * about nfsd, but nfsd does know about nlm..
+	 */
+	switch (nfserr) {
+	case nfs_ok:
+		return 0;
+	case nfserr_dropit:
+		return nlm_drop_reply;
+	case nfserr_stale:
+		return nlm_stale_fh;
+	default:
+		return nlm_failed;
+	}
+}
+
+static void
+nlm_fclose(struct file *filp)
+{
+	fput(filp);
+}
+
+static const struct nlmsvc_binding nfsd_nlm_ops = {
+	.fopen		= nlm_fopen,		/* open file for locking */
+	.fclose		= nlm_fclose,		/* close file */
+};
+
+void
+nfsd_lockd_init(void)
+{
+	dprintk("nfsd: initializing lockd\n");
+	nlmsvc_ops = &nfsd_nlm_ops;
+}
+
+void
+nfsd_lockd_shutdown(void)
+{
+	nlmsvc_ops = NULL;
+}