// 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)
  {

  	__be32		nfserr;

  	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((char*)&fh.fh_handle.fh_base, f->data, f->size);
  	fh.fh_export = NULL;

  	nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, 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
  ");
  	nlmsvc_ops = &nfsd_nlm_ops;
  }
  
  void
  nfsd_lockd_shutdown(void)
  {
  	nlmsvc_ops = NULL;
  }