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  */
  27 static __be32
  28 nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp)
  29 {
  30         __be32          nfserr;
  31         struct svc_fh   fh;
  32
  33         /* must initialize before using! but maxsize doesn't matter */
  34         fh_init(&fh,0);
  35         fh.fh_handle.fh_size = f->size;
  36         memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);
  37         fh.fh_export = NULL;
  38
  39         nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp);
  40         fh_put(&fh);
  41         /* We return nlm error codes as nlm doesn't know
  42          * about nfsd, but nfsd does know about nlm..
  43          */
  44         switch (nfserr) {
  45         case nfs_ok:
  46                 return 0;
  47         case nfserr_dropit:
  48                 return nlm_drop_reply;
  49         case nfserr_stale:
  50                 return nlm_stale_fh;
  51         default:
  52                 return nlm_failed;
  53         }
  54 }
  55
  56 static void
  57 nlm_fclose(struct file *filp)
  58 {
  59         fput(filp);
  60 }
  61
  62 static const struct nlmsvc_binding nfsd_nlm_ops = {
  63         .fopen          = nlm_fopen,            /* open file for locking */
  64         .fclose         = nlm_fclose,           /* close file */
  65 };
  66
  67 void
  68 nfsd_lockd_init(void)
  69 {
  70         dprintk("nfsd: initializing lockd\n");
  71         nlmsvc_ops = &nfsd_nlm_ops;
  72 }
  73
  74 void
  75 nfsd_lockd_shutdown(void)
  76 {
  77         nlmsvc_ops = NULL;
  78 }