fs/lockd/svc4proc.c - fp2-dev/kernel/msm - Gitiles

 /*
  * linux/fs/lockd/svc4proc.c
  *
  * Lockd server procedures. We don't implement the NLM_*_RES
  * procedures because we don't use the async procedures.
  *
  * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
  */

 #include <linux/types.h>
 #include <linux/time.h>
 #include <linux/slab.h>
 #include <linux/in.h>
 #include <linux/sunrpc/svc.h>
 #include <linux/sunrpc/clnt.h>
 #include <linux/nfsd/nfsd.h>
 #include <linux/lockd/lockd.h>
 #include <linux/lockd/share.h>
 #include <linux/lockd/sm_inter.h>


 #define NLMDBG_FACILITY		NLMDBG_CLIENT

 /*
  * Obtain client and file from arguments
  */
 static __be32
 nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
 			struct nlm_host **hostp, struct nlm_file **filp)
 {
 	struct nlm_host		*host = NULL;
 	struct nlm_file		*file = NULL;
 	struct nlm_lock		*lock = &argp->lock;
 	__be32			error = 0;

 	/* nfsd callbacks must have been installed for this procedure */
 	if (!nlmsvc_ops)
 		return nlm_lck_denied_nolocks;

 	/* Obtain host handle */
 	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
 	 || (argp->monitor && nsm_monitor(host) < 0))
 		goto no_locks;
 	*hostp = host;

 	/* Obtain file pointer. Not used by FREE_ALL call. */
 	if (filp != NULL) {
 		if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
 			goto no_locks;
 		*filp = file;

 		/* Set up the missing parts of the file_lock structure */
 		lock->fl.fl_file  = file->f_file;
 		lock->fl.fl_owner = (fl_owner_t) host;
 		lock->fl.fl_lmops = &nlmsvc_lock_operations;
 	}

 	return 0;

 no_locks:
 	nlm_release_host(host);
  	if (error)
 		return error;
 	return nlm_lck_denied_nolocks;
 }

 /*
  * NULL: Test for presence of service
  */
 static __be32
 nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 {
 	dprintk("lockd: NULL          called\n");
 	return rpc_success;
 }

 /*
  * TEST: Check for conflicting lock
  */
 static __be32
 nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
 				         struct nlm_res  *resp)
 {
 	struct nlm_host	*host;
 	struct nlm_file	*file;
 	__be32 rc = rpc_success;

 	dprintk("lockd: TEST4        called\n");
 	resp->cookie = argp->cookie;

 	/* Obtain client and file */
 	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

 	/* Now check for conflicting locks */
 	resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
 	if (resp->status == nlm_drop_reply)
 		rc = rpc_drop_reply;
 	else
 		dprintk("lockd: TEST4        status %d\n", ntohl(resp->status));

 	nlm_release_host(host);
 	nlm_release_file(file);
 	return rc;
 }

 static __be32
 nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
 				         struct nlm_res  *resp)
 {
 	struct nlm_host	*host;
 	struct nlm_file	*file;
 	__be32 rc = rpc_success;

 	dprintk("lockd: LOCK          called\n");

 	resp->cookie = argp->cookie;

 	/* Obtain client and file */
 	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

 #if 0
 	/* If supplied state doesn't match current state, we assume it's
 	 * an old request that time-warped somehow. Any error return would
 	 * do in this case because it's irrelevant anyway.
 	 *
 	 * NB: We don't retrieve the remote host's state yet.
 	 */
 	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
 		resp->status = nlm_lck_denied_nolocks;
 	} else
 #endif

 	/* Now try to lock the file */
 	resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
 					argp->block, &argp->cookie,
 					argp->reclaim);
 	if (resp->status == nlm_drop_reply)
 		rc = rpc_drop_reply;
 	else
 		dprintk("lockd: LOCK         status %d\n", ntohl(resp->status));

 	nlm_release_host(host);
 	nlm_release_file(file);
 	return rc;
 }

 static __be32
 nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
 				           struct nlm_res  *resp)
 {
 	struct nlm_host	*host;
 	struct nlm_file	*file;

 	dprintk("lockd: CANCEL        called\n");

 	resp->cookie = argp->cookie;

 	/* Don't accept requests during grace period */
 	if (locks_in_grace()) {
 		resp->status = nlm_lck_denied_grace_period;
 		return rpc_success;
 	}

 	/* Obtain client and file */
 	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

 	/* Try to cancel request. */
 	resp->status = nlmsvc_cancel_blocked(file, &argp->lock);

 	dprintk("lockd: CANCEL        status %d\n", ntohl(resp->status));
 	nlm_release_host(host);
 	nlm_release_file(file);
 	return rpc_success;
 }

 /*
  * UNLOCK: release a lock
  */
 static __be32
 nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
 				           struct nlm_res  *resp)
 {
 	struct nlm_host	*host;
 	struct nlm_file	*file;

 	dprintk("lockd: UNLOCK        called\n");

 	resp->cookie = argp->cookie;

 	/* Don't accept new lock requests during grace period */
 	if (locks_in_grace()) {
 		resp->status = nlm_lck_denied_grace_period;
 		return rpc_success;
 	}

 	/* Obtain client and file */
 	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

 	/* Now try to remove the lock */
 	resp->status = nlmsvc_unlock(file, &argp->lock);

 	dprintk("lockd: UNLOCK        status %d\n", ntohl(resp->status));
 	nlm_release_host(host);
 	nlm_release_file(file);
 	return rpc_success;
 }

 /*
  * GRANTED: A server calls us to tell that a process' lock request
  * was granted
  */
 static __be32
 nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
 				            struct nlm_res  *resp)
 {
 	resp->cookie = argp->cookie;

 	dprintk("lockd: GRANTED       called\n");
 	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
 	dprintk("lockd: GRANTED       status %d\n", ntohl(resp->status));
 	return rpc_success;
 }

 /*
  * This is the generic lockd callback for async RPC calls
  */
 static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
 {
 	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
 			-task->tk_status);
 }

 static void nlm4svc_callback_release(void *data)
 {
 	lock_kernel();
 	nlm_release_call(data);
 	unlock_kernel();
 }

 static const struct rpc_call_ops nlm4svc_callback_ops = {
 	.rpc_call_done = nlm4svc_callback_exit,
 	.rpc_release = nlm4svc_callback_release,
 };

 /*
  * `Async' versions of the above service routines. They aren't really,
  * because we send the callback before the reply proper. I hope this
  * doesn't break any clients.
  */
 static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
 		__be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res  *))
 {
 	struct nlm_host	*host;
 	struct nlm_rqst	*call;
 	__be32 stat;

 	host = nlmsvc_lookup_host(rqstp,
 				  argp->lock.caller,
 				  argp->lock.len);
 	if (host == NULL)
 		return rpc_system_err;

 	call = nlm_alloc_call(host);
 	if (call == NULL)
 		return rpc_system_err;

 	stat = func(rqstp, argp, &call->a_res);
 	if (stat != 0) {
 		nlm_release_call(call);
 		return stat;
 	}

 	call->a_flags = RPC_TASK_ASYNC;
 	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
 		return rpc_system_err;
 	return rpc_success;
 }

 static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 					     void	     *resp)
 {
 	dprintk("lockd: TEST_MSG      called\n");
 	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
 }

 static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 					     void	     *resp)
 {
 	dprintk("lockd: LOCK_MSG      called\n");
 	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
 }

 static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 					       void	       *resp)
 {
 	dprintk("lockd: CANCEL_MSG    called\n");
 	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
 }

 static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
                                                void            *resp)
 {
 	dprintk("lockd: UNLOCK_MSG    called\n");
 	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
 }

 static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
                                                 void            *resp)
 {
 	dprintk("lockd: GRANTED_MSG   called\n");
 	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
 }

 /*
  * SHARE: create a DOS share or alter existing share.
  */
 static __be32
 nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
 				          struct nlm_res  *resp)
 {
 	struct nlm_host	*host;
 	struct nlm_file	*file;

 	dprintk("lockd: SHARE         called\n");

 	resp->cookie = argp->cookie;

 	/* Don't accept new lock requests during grace period */
 	if (locks_in_grace() && !argp->reclaim) {
 		resp->status = nlm_lck_denied_grace_period;
 		return rpc_success;
 	}

 	/* Obtain client and file */
 	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

 	/* Now try to create the share */
 	resp->status = nlmsvc_share_file(host, file, argp);

 	dprintk("lockd: SHARE         status %d\n", ntohl(resp->status));
 	nlm_release_host(host);
 	nlm_release_file(file);
 	return rpc_success;
 }

 /*
  * UNSHARE: Release a DOS share.
  */
 static __be32
 nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
 				            struct nlm_res  *resp)
 {
 	struct nlm_host	*host;
 	struct nlm_file	*file;

 	dprintk("lockd: UNSHARE       called\n");

 	resp->cookie = argp->cookie;

 	/* Don't accept requests during grace period */
 	if (locks_in_grace()) {
 		resp->status = nlm_lck_denied_grace_period;
 		return rpc_success;
 	}

 	/* Obtain client and file */
 	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

 	/* Now try to lock the file */
 	resp->status = nlmsvc_unshare_file(host, file, argp);

 	dprintk("lockd: UNSHARE       status %d\n", ntohl(resp->status));
 	nlm_release_host(host);
 	nlm_release_file(file);
 	return rpc_success;
 }

 /*
  * NM_LOCK: Create an unmonitored lock
  */
 static __be32
 nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
 				            struct nlm_res  *resp)
 {
 	dprintk("lockd: NM_LOCK       called\n");

 	argp->monitor = 0;		/* just clean the monitor flag */
 	return nlm4svc_proc_lock(rqstp, argp, resp);
 }

 /*
  * FREE_ALL: Release all locks and shares held by client
  */
 static __be32
 nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
 					     void            *resp)
 {
 	struct nlm_host	*host;

 	/* Obtain client */
 	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
 		return rpc_success;

 	nlmsvc_free_host_resources(host);
 	nlm_release_host(host);
 	return rpc_success;
 }

 /*
  * SM_NOTIFY: private callback from statd (not part of official NLM proto)
  */
 static __be32
 nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
 					      void	        *resp)
 {
 	dprintk("lockd: SM_NOTIFY     called\n");

 	if (!nlm_privileged_requester(rqstp)) {
 		char buf[RPC_MAX_ADDRBUFLEN];
 		printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
 				svc_print_addr(rqstp, buf, sizeof(buf)));
 		return rpc_system_err;
 	}

 	nlm_host_rebooted(argp);
 	return rpc_success;
 }

 /*
  * client sent a GRANTED_RES, let's remove the associated block
  */
 static __be32
 nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res  *argp,
                                                 void            *resp)
 {
         if (!nlmsvc_ops)
                 return rpc_success;

         dprintk("lockd: GRANTED_RES   called\n");

         nlmsvc_grant_reply(&argp->cookie, argp->status);
         return rpc_success;
 }


 /*
  * NLM Server procedures.
  */

 #define nlm4svc_encode_norep	nlm4svc_encode_void
 #define nlm4svc_decode_norep	nlm4svc_decode_void
 #define nlm4svc_decode_testres	nlm4svc_decode_void
 #define nlm4svc_decode_lockres	nlm4svc_decode_void
 #define nlm4svc_decode_unlockres	nlm4svc_decode_void
 #define nlm4svc_decode_cancelres	nlm4svc_decode_void
 #define nlm4svc_decode_grantedres	nlm4svc_decode_void

 #define nlm4svc_proc_none	nlm4svc_proc_null
 #define nlm4svc_proc_test_res	nlm4svc_proc_null
 #define nlm4svc_proc_lock_res	nlm4svc_proc_null
 #define nlm4svc_proc_cancel_res	nlm4svc_proc_null
 #define nlm4svc_proc_unlock_res	nlm4svc_proc_null

 struct nlm_void			{ int dummy; };

 #define PROC(name, xargt, xrest, argt, rest, respsize)	\
  { .pc_func	= (svc_procfunc) nlm4svc_proc_##name,	\
    .pc_decode	= (kxdrproc_t) nlm4svc_decode_##xargt,	\
    .pc_encode	= (kxdrproc_t) nlm4svc_encode_##xrest,	\
    .pc_release	= NULL,					\
    .pc_argsize	= sizeof(struct nlm_##argt),		\
    .pc_ressize	= sizeof(struct nlm_##rest),		\
    .pc_xdrressize = respsize,				\
  }
 #define	Ck	(1+XDR_QUADLEN(NLM_MAXCOOKIELEN))	/* cookie */
 #define	No	(1+1024/4)				/* netobj */
 #define	St	1					/* status */
 #define	Rg	4					/* range (offset + length) */
 struct svc_procedure		nlmsvc_procedures4[] = {
   PROC(null,		void,		void,		void,	void, 1),
   PROC(test,		testargs,	testres,	args,	res, Ck+St+2+No+Rg),
   PROC(lock,		lockargs,	res,		args,	res, Ck+St),
   PROC(cancel,		cancargs,	res,		args,	res, Ck+St),
   PROC(unlock,		unlockargs,	res,		args,	res, Ck+St),
   PROC(granted,		testargs,	res,		args,	res, Ck+St),
   PROC(test_msg,	testargs,	norep,		args,	void, 1),
   PROC(lock_msg,	lockargs,	norep,		args,	void, 1),
   PROC(cancel_msg,	cancargs,	norep,		args,	void, 1),
   PROC(unlock_msg,	unlockargs,	norep,		args,	void, 1),
   PROC(granted_msg,	testargs,	norep,		args,	void, 1),
   PROC(test_res,	testres,	norep,		res,	void, 1),
   PROC(lock_res,	lockres,	norep,		res,	void, 1),
   PROC(cancel_res,	cancelres,	norep,		res,	void, 1),
   PROC(unlock_res,	unlockres,	norep,		res,	void, 1),
   PROC(granted_res,	res,		norep,		res,	void, 1),
   /* statd callback */
   PROC(sm_notify,	reboot,		void,		reboot,	void, 1),
   PROC(none,		void,		void,		void,	void, 0),
   PROC(none,		void,		void,		void,	void, 0),
   PROC(none,		void,		void,		void,	void, 0),
   PROC(share,		shareargs,	shareres,	args,	res, Ck+St+1),
   PROC(unshare,		shareargs,	shareres,	args,	res, Ck+St+1),
   PROC(nm_lock,		lockargs,	res,		args,	res, Ck+St),
   PROC(free_all,	notify,		void,		args,	void, 1),

 };
	/*
	* linux/fs/lockd/svc4proc.c
	*
	* Lockd server procedures. We don't implement the NLM_*_RES
	* procedures because we don't use the async procedures.
	*
	* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
	*/

	#include <linux/types.h>
	#include <linux/time.h>
	#include <linux/slab.h>
	#include <linux/in.h>
	#include <linux/sunrpc/svc.h>
	#include <linux/sunrpc/clnt.h>
	#include <linux/nfsd/nfsd.h>
	#include <linux/lockd/lockd.h>
	#include <linux/lockd/share.h>
	#include <linux/lockd/sm_inter.h>


	#define NLMDBG_FACILITY NLMDBG_CLIENT

	/*
	* Obtain client and file from arguments
	*/
	static __be32
	nlm4svc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	struct nlm_host hostp, struct nlm_file filp)
	{
	struct nlm_host *host = NULL;
	struct nlm_file *file = NULL;
	struct nlm_lock *lock = &argp->lock;
	__be32 error = 0;

	/* nfsd callbacks must have been installed for this procedure */
	if (!nlmsvc_ops)
	return nlm_lck_denied_nolocks;

	/* Obtain host handle */
	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
	\|\| (argp->monitor && nsm_monitor(host) < 0))
	goto no_locks;
	*hostp = host;

	/* Obtain file pointer. Not used by FREE_ALL call. */
	if (filp != NULL) {
	if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
	goto no_locks;
	*filp = file;

	/* Set up the missing parts of the file_lock structure */
	lock->fl.fl_file = file->f_file;
	lock->fl.fl_owner = (fl_owner_t) host;
	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	}

	return 0;

	no_locks:
	nlm_release_host(host);
	if (error)
	return error;
	return nlm_lck_denied_nolocks;
	}

	/*
	* NULL: Test for presence of service
	*/
	static __be32
	nlm4svc_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	{
	dprintk("lockd: NULL called\n");
	return rpc_success;
	}

	/*
	* TEST: Check for conflicting lock
	*/
	static __be32
	nlm4svc_proc_test(struct svc_rqst rqstp, struct nlm_args argp,
	struct nlm_res *resp)
	{
	struct nlm_host *host;
	struct nlm_file *file;
	__be32 rc = rpc_success;

	dprintk("lockd: TEST4 called\n");
	resp->cookie = argp->cookie;

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now check for conflicting locks */
	resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
	if (resp->status == nlm_drop_reply)
	rc = rpc_drop_reply;
	else
	dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));

	nlm_release_host(host);
	nlm_release_file(file);
	return rc;
	}

	static __be32
	nlm4svc_proc_lock(struct svc_rqst rqstp, struct nlm_args argp,
	struct nlm_res *resp)
	{
	struct nlm_host *host;
	struct nlm_file *file;
	__be32 rc = rpc_success;

	dprintk("lockd: LOCK called\n");

	resp->cookie = argp->cookie;

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	#if 0
	/* If supplied state doesn't match current state, we assume it's
	* an old request that time-warped somehow. Any error return would
	* do in this case because it's irrelevant anyway.
	*
	* NB: We don't retrieve the remote host's state yet.
	*/
	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	resp->status = nlm_lck_denied_nolocks;
	} else
	#endif

	/* Now try to lock the file */
	resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
	argp->block, &argp->cookie,
	argp->reclaim);
	if (resp->status == nlm_drop_reply)
	rc = rpc_drop_reply;
	else
	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));

	nlm_release_host(host);
	nlm_release_file(file);
	return rc;
	}

	static __be32
	nlm4svc_proc_cancel(struct svc_rqst rqstp, struct nlm_args argp,
	struct nlm_res *resp)
	{
	struct nlm_host *host;
	struct nlm_file *file;

	dprintk("lockd: CANCEL called\n");

	resp->cookie = argp->cookie;

	/* Don't accept requests during grace period */
	if (locks_in_grace()) {
	resp->status = nlm_lck_denied_grace_period;
	return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Try to cancel request. */
	resp->status = nlmsvc_cancel_blocked(file, &argp->lock);

	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
	nlm_release_host(host);
	nlm_release_file(file);
	return rpc_success;
	}

	/*
	* UNLOCK: release a lock
	*/
	static __be32
	nlm4svc_proc_unlock(struct svc_rqst rqstp, struct nlm_args argp,
	struct nlm_res *resp)
	{
	struct nlm_host *host;
	struct nlm_file *file;

	dprintk("lockd: UNLOCK called\n");

	resp->cookie = argp->cookie;

	/* Don't accept new lock requests during grace period */
	if (locks_in_grace()) {
	resp->status = nlm_lck_denied_grace_period;
	return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now try to remove the lock */
	resp->status = nlmsvc_unlock(file, &argp->lock);

	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
	nlm_release_host(host);
	nlm_release_file(file);
	return rpc_success;
	}

	/*
	* GRANTED: A server calls us to tell that a process' lock request
	* was granted
	*/
	static __be32
	nlm4svc_proc_granted(struct svc_rqst rqstp, struct nlm_args argp,
	struct nlm_res *resp)
	{
	resp->cookie = argp->cookie;

	dprintk("lockd: GRANTED called\n");
	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	return rpc_success;
	}

	/*
	* This is the generic lockd callback for async RPC calls
	*/
	static void nlm4svc_callback_exit(struct rpc_task task, void data)
	{
	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
	-task->tk_status);
	}

	static void nlm4svc_callback_release(void *data)
	{
	lock_kernel();
	nlm_release_call(data);
	unlock_kernel();
	}

	static const struct rpc_call_ops nlm4svc_callback_ops = {
	.rpc_call_done = nlm4svc_callback_exit,
	.rpc_release = nlm4svc_callback_release,
	};

	/*
	* `Async' versions of the above service routines. They aren't really,
	* because we send the callback before the reply proper. I hope this
	* doesn't break any clients.
	*/
	static __be32 nlm4svc_callback(struct svc_rqst rqstp, u32 proc, struct nlm_args argp,
	__be32 (func)(struct svc_rqst , struct nlm_args , struct nlm_res ))
	{
	struct nlm_host *host;
	struct nlm_rqst *call;
	__be32 stat;

	host = nlmsvc_lookup_host(rqstp,
	argp->lock.caller,
	argp->lock.len);
	if (host == NULL)
	return rpc_system_err;

	call = nlm_alloc_call(host);
	if (call == NULL)
	return rpc_system_err;

	stat = func(rqstp, argp, &call->a_res);
	if (stat != 0) {
	nlm_release_call(call);
	return stat;
	}

	call->a_flags = RPC_TASK_ASYNC;
	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
	return rpc_system_err;
	return rpc_success;
	}

	static __be32 nlm4svc_proc_test_msg(struct svc_rqst rqstp, struct nlm_args argp,
	void *resp)
	{
	dprintk("lockd: TEST_MSG called\n");
	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
	}

	static __be32 nlm4svc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
	void *resp)
	{
	dprintk("lockd: LOCK_MSG called\n");
	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
	}

	static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst rqstp, struct nlm_args argp,
	void *resp)
	{
	dprintk("lockd: CANCEL_MSG called\n");
	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
	}

	static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst rqstp, struct nlm_args argp,
	void *resp)
	{
	dprintk("lockd: UNLOCK_MSG called\n");
	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
	}

	static __be32 nlm4svc_proc_granted_msg(struct svc_rqst rqstp, struct nlm_args argp,
	void *resp)
	{
	dprintk("lockd: GRANTED_MSG called\n");
	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
	}

	/*
	* SHARE: create a DOS share or alter existing share.
	*/
	static __be32
	nlm4svc_proc_share(struct svc_rqst rqstp, struct nlm_args argp,
	struct nlm_res *resp)
	{
	struct nlm_host *host;
	struct nlm_file *file;

	dprintk("lockd: SHARE called\n");

	resp->cookie = argp->cookie;

	/* Don't accept new lock requests during grace period */
	if (locks_in_grace() && !argp->reclaim) {
	resp->status = nlm_lck_denied_grace_period;
	return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now try to create the share */
	resp->status = nlmsvc_share_file(host, file, argp);

	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
	nlm_release_host(host);
	nlm_release_file(file);
	return rpc_success;
	}

	/*
	* UNSHARE: Release a DOS share.
	*/
	static __be32
	nlm4svc_proc_unshare(struct svc_rqst rqstp, struct nlm_args argp,
	struct nlm_res *resp)
	{
	struct nlm_host *host;
	struct nlm_file *file;

	dprintk("lockd: UNSHARE called\n");

	resp->cookie = argp->cookie;

	/* Don't accept requests during grace period */
	if (locks_in_grace()) {
	resp->status = nlm_lck_denied_grace_period;
	return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now try to lock the file */
	resp->status = nlmsvc_unshare_file(host, file, argp);

	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
	nlm_release_host(host);
	nlm_release_file(file);
	return rpc_success;
	}

	/*
	* NM_LOCK: Create an unmonitored lock
	*/
	static __be32
	nlm4svc_proc_nm_lock(struct svc_rqst rqstp, struct nlm_args argp,
	struct nlm_res *resp)
	{
	dprintk("lockd: NM_LOCK called\n");

	argp->monitor = 0; /* just clean the monitor flag */
	return nlm4svc_proc_lock(rqstp, argp, resp);
	}

	/*
	* FREE_ALL: Release all locks and shares held by client
	*/
	static __be32
	nlm4svc_proc_free_all(struct svc_rqst rqstp, struct nlm_args argp,
	void *resp)
	{
	struct nlm_host *host;

	/* Obtain client */
	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
	return rpc_success;

	nlmsvc_free_host_resources(host);
	nlm_release_host(host);
	return rpc_success;
	}

	/*
	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	*/
	static __be32
	nlm4svc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
	void *resp)
	{
	dprintk("lockd: SM_NOTIFY called\n");

	if (!nlm_privileged_requester(rqstp)) {
	char buf[RPC_MAX_ADDRBUFLEN];
	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	svc_print_addr(rqstp, buf, sizeof(buf)));
	return rpc_system_err;
	}

	nlm_host_rebooted(argp);
	return rpc_success;
	}

	/*
	* client sent a GRANTED_RES, let's remove the associated block
	*/
	static __be32
	nlm4svc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
	void *resp)
	{
	if (!nlmsvc_ops)
	return rpc_success;

	dprintk("lockd: GRANTED_RES called\n");

	nlmsvc_grant_reply(&argp->cookie, argp->status);
	return rpc_success;
	}


	/*
	* NLM Server procedures.
	*/

	#define nlm4svc_encode_norep nlm4svc_encode_void
	#define nlm4svc_decode_norep nlm4svc_decode_void
	#define nlm4svc_decode_testres nlm4svc_decode_void
	#define nlm4svc_decode_lockres nlm4svc_decode_void
	#define nlm4svc_decode_unlockres nlm4svc_decode_void
	#define nlm4svc_decode_cancelres nlm4svc_decode_void
	#define nlm4svc_decode_grantedres nlm4svc_decode_void

	#define nlm4svc_proc_none nlm4svc_proc_null
	#define nlm4svc_proc_test_res nlm4svc_proc_null
	#define nlm4svc_proc_lock_res nlm4svc_proc_null
	#define nlm4svc_proc_cancel_res nlm4svc_proc_null
	#define nlm4svc_proc_unlock_res nlm4svc_proc_null

	struct nlm_void { int dummy; };

	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	{ .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
	.pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
	.pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
	.pc_release = NULL, \
	.pc_argsize = sizeof(struct nlm_##argt), \
	.pc_ressize = sizeof(struct nlm_##rest), \
	.pc_xdrressize = respsize, \
	}
	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	#define No (1+1024/4) /* netobj */
	#define St 1 /* status */
	#define Rg 4 /* range (offset + length) */
	struct svc_procedure nlmsvc_procedures4[] = {
	PROC(null, void, void, void, void, 1),
	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	PROC(lock, lockargs, res, args, res, Ck+St),
	PROC(cancel, cancargs, res, args, res, Ck+St),
	PROC(unlock, unlockargs, res, args, res, Ck+St),
	PROC(granted, testargs, res, args, res, Ck+St),
	PROC(test_msg, testargs, norep, args, void, 1),
	PROC(lock_msg, lockargs, norep, args, void, 1),
	PROC(cancel_msg, cancargs, norep, args, void, 1),
	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	PROC(granted_msg, testargs, norep, args, void, 1),
	PROC(test_res, testres, norep, res, void, 1),
	PROC(lock_res, lockres, norep, res, void, 1),
	PROC(cancel_res, cancelres, norep, res, void, 1),
	PROC(unlock_res, unlockres, norep, res, void, 1),
	PROC(granted_res, res, norep, res, void, 1),
	/* statd callback */
	PROC(sm_notify, reboot, void, reboot, void, 1),
	PROC(none, void, void, void, void, 0),
	PROC(none, void, void, void, void, 0),
	PROC(none, void, void, void, void, 0),
	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	PROC(free_all, notify, void, args, void, 1),

	};