fs/nfsd/lockd.c

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