LXR linux/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/fs.h>
  13#include <linux/file.h>
  14#include <linux/mount.h>
  15#include <linux/sunrpc/clnt.h>
  16#include <linux/sunrpc/svc.h>
  17#include <linux/nfsd/nfsd.h>
  18#include <linux/lockd/bind.h>
  19
  20#define NFSDDBG_FACILITY                NFSDDBG_LOCKD
  21
  22#ifdef CONFIG_LOCKD_V4
  23#define nlm_stale_fh    nlm4_stale_fh
  24#define nlm_failed      nlm4_failed
  25#else
  26#define nlm_stale_fh    nlm_lck_denied_nolocks
  27#define nlm_failed      nlm_lck_denied_nolocks
  28#endif
  29/*
  30 * Note: we hold the dentry use count while the file is open.
  31 */
  32static __be32
  33nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp)
  34{
  35        __be32          nfserr;
  36        struct svc_fh   fh;
  37
  38        /* must initialize before using! but maxsize doesn't matter */
  39        fh_init(&fh,0);
  40        fh.fh_handle.fh_size = f->size;
  41        memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);
  42        fh.fh_export = NULL;
  43
  44        exp_readlock();
  45        nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp);
  46        fh_put(&fh);
  47        rqstp->rq_client = NULL;
  48        exp_readunlock();
  49        /* We return nlm error codes as nlm doesn't know
  50         * about nfsd, but nfsd does know about nlm..
  51         */
  52        switch (nfserr) {
  53        case nfs_ok:
  54                return 0;
  55        case nfserr_dropit:
  56                return nlm_drop_reply;
  57        case nfserr_stale:
  58                return nlm_stale_fh;
  59        default:
  60                return nlm_failed;
  61        }
  62}
  63
  64static void
  65nlm_fclose(struct file *filp)
  66{
  67        fput(filp);
  68}
  69
  70static struct nlmsvc_binding    nfsd_nlm_ops = {
  71        .fopen          = nlm_fopen,            /* open file for locking */
  72        .fclose         = nlm_fclose,           /* close file */
  73};
  74
  75void
  76nfsd_lockd_init(void)
  77{
  78        dprintk("nfsd: initializing lockd\n");
  79        nlmsvc_ops = &nfsd_nlm_ops;
  80}
  81
  82void
  83nfsd_lockd_shutdown(void)
  84{
  85        nlmsvc_ops = NULL;
  86}
  87