linux/fs/nfsd/lockd.c
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   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 */
  26static __be32
  27nlm_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        nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp);
  39        fh_put(&fh);
  40        /* We return nlm error codes as nlm doesn't know
  41         * about nfsd, but nfsd does know about nlm..
  42         */
  43        switch (nfserr) {
  44        case nfs_ok:
  45                return 0;
  46        case nfserr_dropit:
  47                return nlm_drop_reply;
  48        case nfserr_stale:
  49                return nlm_stale_fh;
  50        default:
  51                return nlm_failed;
  52        }
  53}
  54
  55static void
  56nlm_fclose(struct file *filp)
  57{
  58        fput(filp);
  59}
  60
  61static struct nlmsvc_binding    nfsd_nlm_ops = {
  62        .fopen          = nlm_fopen,            /* open file for locking */
  63        .fclose         = nlm_fclose,           /* close file */
  64};
  65
  66void
  67nfsd_lockd_init(void)
  68{
  69        dprintk("nfsd: initializing lockd\n");
  70        nlmsvc_ops = &nfsd_nlm_ops;
  71}
  72
  73void
  74nfsd_lockd_shutdown(void)
  75{
  76        nlmsvc_ops = NULL;
  77}
  78
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