LXR linux/fs/nfsd/lockd.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * This file contains all the stubs needed when communicating with lockd.
   4 * This level of indirection is necessary so we can run nfsd+lockd without
   5 * requiring the nfs client to be compiled in/loaded, and vice versa.
   6 *
   7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
   8 */
   9
  10#include <linux/file.h>
  11#include <linux/lockd/bind.h>
  12#include "nfsd.h"
  13#include "vfs.h"
  14
  15#define NFSDDBG_FACILITY                NFSDDBG_LOCKD
  16
  17#ifdef CONFIG_LOCKD_V4
  18#define nlm_stale_fh    nlm4_stale_fh
  19#define nlm_failed      nlm4_failed
  20#else
  21#define nlm_stale_fh    nlm_lck_denied_nolocks
  22#define nlm_failed      nlm_lck_denied_nolocks
  23#endif
  24/*
  25 * Note: we hold the dentry use count while the file is open.
  26 */
  27static __be32
  28nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp,
  29                int mode)
  30{
  31        __be32          nfserr;
  32        int             access;
  33        struct svc_fh   fh;
  34
  35        /* must initialize before using! but maxsize doesn't matter */
  36        fh_init(&fh,0);
  37        fh.fh_handle.fh_size = f->size;
  38        memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);
  39        fh.fh_export = NULL;
  40
  41        access = (mode == O_WRONLY) ? NFSD_MAY_WRITE : NFSD_MAY_READ;
  42        access |= NFSD_MAY_LOCK;
  43        nfserr = nfsd_open(rqstp, &fh, S_IFREG, access, filp);
  44        fh_put(&fh);
  45        /* We return nlm error codes as nlm doesn't know
  46         * about nfsd, but nfsd does know about nlm..
  47         */
  48        switch (nfserr) {
  49        case nfs_ok:
  50                return 0;
  51        case nfserr_dropit:
  52                return nlm_drop_reply;
  53        case nfserr_stale:
  54                return nlm_stale_fh;
  55        default:
  56                return nlm_failed;
  57        }
  58}
  59
  60static void
  61nlm_fclose(struct file *filp)
  62{
  63        fput(filp);
  64}
  65
  66static const struct nlmsvc_binding nfsd_nlm_ops = {
  67        .fopen          = nlm_fopen,            /* open file for locking */
  68        .fclose         = nlm_fclose,           /* close file */
  69};
  70
  71void
  72nfsd_lockd_init(void)
  73{
  74        dprintk("nfsd: initializing lockd\n");
  75        nlmsvc_ops = &nfsd_nlm_ops;
  76}
  77
  78void
  79nfsd_lockd_shutdown(void)
  80{
  81        nlmsvc_ops = NULL;
  82}
  83