fs/nfsd/lockd.c

   1 /*
   2  * linux/fs/nfsd/lockd.c
   3  *
   4  * This file contains all the stubs needed when communicating with lockd.
   5  * This level of indirection is necessary so we can run nfsd+lockd without
   6  * requiring the nfs client to be compiled in/loaded, and vice versa.
   7  *
   8  * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/sunrpc/clnt.h>
  13 #include <linux/sunrpc/svc.h>
  14 #include <linux/nfsd/nfsd.h>
  15 #include <linux/lockd/bind.h>
  16
  17 #define NFSDDBG_FACILITY                NFSDDBG_LOCKD
  18
  19 /*
  20  * Note: we hold the dentry use count while the file is open.
  21  */
  22 static u32
  23 nlm_fopen(struct svc_rqst *rqstp, struct knfs_fh *f, struct file *filp)
  24 {
  25         u32             nfserr;
  26         struct svc_fh   fh;
  27
  28         /* must initialize before using! */
  29         fh_init(&fh);
  30         fh.fh_handle = *f;
  31         fh.fh_export = NULL;
  32
  33         nfserr = nfsd_open(rqstp, &fh, S_IFREG, 0, filp);
  34         if (!nfserr)
  35                 dget(filp->f_dentry);
  36         fh_put(&fh);
  37         return nfserr;
  38 }
  39
  40 static void
  41 nlm_fclose(struct file *filp)
  42 {
  43         nfsd_close(filp);
  44         dput(filp->f_dentry);
  45 }
  46
  47 struct nlmsvc_binding           nfsd_nlm_ops = {
  48         exp_readlock,           /* lock export table for reading */
  49         exp_unlock,             /* unlock export table */
  50         exp_getclient,          /* look up NFS client */
  51         nlm_fopen,              /* open file for locking */
  52         nlm_fclose,             /* close file */
  53         exp_nlmdetach,          /* lockd shutdown notification */
  54 };
  55
  56 /*
  57  * When removing an NFS client entry, notify lockd that it is gone.
  58  * FIXME: We should do the same when unexporting an NFS volume.
  59  */
  60 void
  61 nfsd_lockd_unexport(struct svc_client *clnt)
  62 {
  63         nlmsvc_invalidate_client(clnt);
  64 }
  65
  66 void
  67 nfsd_lockd_init(void)
  68 {
  69         dprintk("nfsd: initializing lockd\n");
  70         nlmsvc_ops = &nfsd_nlm_ops;
  71 }
  72
  73 void
  74 nfsd_lockd_shutdown(void)
  75 {
  76         nlmsvc_ops = NULL;
  77 }