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/*

 * linux/fs/nfsd/lockd.c

 *

 * This file contains all the stubs needed when communicating with lockd.

 * This level of indirection is necessary so we can run nfsd+lockd without

 * requiring the nfs client to be compiled in/loaded, and vice versa.

 *

 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>

 */

#include <linux/types.h>

#include <linux/sunrpc/clnt.h>

#include <linux/sunrpc/svc.h>

#include <linux/nfsd/nfsd.h>

#include <linux/lockd/bind.h>

#define NFSDDBG_FACILITY                NFSDDBG_LOCKD

/*

 * Note: we hold the dentry use count while the file is open.

 */

static u32

nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file *filp)

{

        u32             nfserr;

        struct svc_fh   fh;

        /* must initialize before using! but maxsize doesn't matter */

        fh_init(&fh,0);

        fh.fh_handle.fh_size = f->size;

        memcpy((char*)&fh.fh_handle.fh_base, f->data, f->size);

        fh.fh_export = NULL;

        nfserr = nfsd_open(rqstp, &fh, S_IFREG, MAY_LOCK, filp);

        if (!nfserr) {

                dget(filp->f_dentry);

                mntget(filp->f_vfsmnt);

        }

        fh_put(&fh);

        /* nlm and nfsd don't share error codes.

         * we invent: 0 = no error

         *            1 = stale file handle

         *            2 = other error

         */

        switch (nfserr) {

        case nfs_ok:

                return 0;

        case nfserr_stale:

                return 1;

        default:

                return 2;

        }

}

static void

nlm_fclose(struct file *filp)

{

        nfsd_close(filp);

        dput(filp->f_dentry);

        mntput(filp->f_vfsmnt);

}

struct nlmsvc_binding           nfsd_nlm_ops = {

        exp_readlock,           /* lock export table for reading */

        exp_unlock,             /* unlock export table */

        exp_getclient,          /* look up NFS client */

        nlm_fopen,              /* open file for locking */

        nlm_fclose,             /* close file */

        exp_nlmdetach,          /* lockd shutdown notification */

};

/*

 * When removing an NFS client entry, notify lockd that it is gone.

 * FIXME: We should do the same when unexporting an NFS volume.

 */

void

nfsd_lockd_unexport(struct svc_client *clnt)

{

        nlmsvc_invalidate_client(clnt);

}

void

nfsd_lockd_init(void)

{

        dprintk("nfsd: initializing lockd\n");

        nlmsvc_ops = &nfsd_nlm_ops;

}

void

nfsd_lockd_shutdown(void)

{

        nlmsvc_ops = NULL;

}