[linux-block.git] / fs / lockd / svcproc.c

/*
 * linux/fs/lockd/svcproc.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/smp_lock.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/share.h>

#define NLMDBG_FACILITY		NLMDBG_CLIENT

#ifdef CONFIG_LOCKD_V4
static __be32
cast_to_nlm(__be32 status, u32 vers)
{
	/* Note: status is assumed to be in network byte order !!! */
	if (vers != 4){
		switch (status) {
		case nlm_granted:
		case nlm_lck_denied:
		case nlm_lck_denied_nolocks:
		case nlm_lck_blocked:
		case nlm_lck_denied_grace_period:
		case nlm_drop_reply:
			break;
		case nlm4_deadlock:
			status = nlm_lck_denied;
			break;
		default:
			status = nlm_lck_denied_nolocks;
		}
	}

	return (status);
}
#define	cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
#else
#define cast_status(status) (status)
#endif

/*
 * Obtain client and file from arguments
 */
static __be32
nlmsvc_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
nlmsvc_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
nlmsvc_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: TEST          called\n");
	resp->cookie = argp->cookie;

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

	/* Now check for conflicting locks */
	resp->status = cast_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: TEST          status %d vers %d\n",
			ntohl(resp->status), rqstp->rq_vers);

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

static __be32
nlmsvc_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 = nlmsvc_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 = cast_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
nlmsvc_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 = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Try to cancel request. */
	resp->status = cast_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
nlmsvc_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 = nlmsvc_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 = cast_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
nlmsvc_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 nlmsvc_callback_exit(struct rpc_task *task, void *data)
{
	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
			-task->tk_status);
}

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

static const struct rpc_call_ops nlmsvc_callback_ops = {
	.rpc_call_done = nlmsvc_callback_exit,
	.rpc_release = nlmsvc_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 nlmsvc_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, &nlmsvc_callback_ops) < 0)
		return rpc_system_err;
	return rpc_success;
}

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

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

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

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

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

/*
 * SHARE: create a DOS share or alter existing share.
 */
static __be32
nlmsvc_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 = nlmsvc_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 = cast_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
nlmsvc_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 = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now try to unshare the file */
	resp->status = cast_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
nlmsvc_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 nlmsvc_proc_lock(rqstp, argp, resp);
}

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

	/* Obtain client */
	if (nlmsvc_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
nlmsvc_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
nlmsvc_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 nlmsvc_encode_norep	nlmsvc_encode_void
#define nlmsvc_decode_norep	nlmsvc_decode_void
#define nlmsvc_decode_testres	nlmsvc_decode_void
#define nlmsvc_decode_lockres	nlmsvc_decode_void
#define nlmsvc_decode_unlockres	nlmsvc_decode_void
#define nlmsvc_decode_cancelres	nlmsvc_decode_void
#define nlmsvc_decode_grantedres	nlmsvc_decode_void

#define nlmsvc_proc_none	nlmsvc_proc_null
#define nlmsvc_proc_test_res	nlmsvc_proc_null
#define nlmsvc_proc_lock_res	nlmsvc_proc_null
#define nlmsvc_proc_cancel_res	nlmsvc_proc_null
#define nlmsvc_proc_unlock_res	nlmsvc_proc_null

struct nlm_void			{ int dummy; };

#define PROC(name, xargt, xrest, argt, rest, respsize)	\
 { .pc_func	= (svc_procfunc) nlmsvc_proc_##name,	\
   .pc_decode	= (kxdrproc_t) nlmsvc_decode_##xargt,	\
   .pc_encode	= (kxdrproc_t) nlmsvc_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	St	1				/* status */
#define	No	(1+1024/4)			/* Net Obj */
#define	Rg	2				/* range - offset + size */

struct svc_procedure		nlmsvc_procedures[] = {
  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, 1),
  PROC(none,		void,		void,		void,	void, 1),
  PROC(none,		void,		void,		void,	void, 1),
  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, 0),

};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/lockd/svcproc.c
	3	*
	4	* Lockd server procedures. We don't implement the NLM_*_RES
	5	* procedures because we don't use the async procedures.
	6	*
	7	* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
	8	*/
	9
1da177e4 LT	10	#include <linux/types.h>
1da177e4 LT	11	#include <linux/time.h>
405f5571	12	#include <linux/smp_lock.h>
1da177e4 LT	13	#include <linux/lockd/lockd.h>
1da177e4 LT	14	#include <linux/lockd/share.h>
1da177e4 LT	15
	16	#define NLMDBG_FACILITY NLMDBG_CLIENT
	17
1da177e4	18	#ifdef CONFIG_LOCKD_V4
52921e02 AV	19	static __be32
52921e02 AV	20	cast_to_nlm(__be32 status, u32 vers)
1da177e4 LT	21	{
	22	/* Note: status is assumed to be in network byte order !!! */
	23	if (vers != 4){
	24	switch (status) {
	25	case nlm_granted:
	26	case nlm_lck_denied:
	27	case nlm_lck_denied_nolocks:
	28	case nlm_lck_blocked:
	29	case nlm_lck_denied_grace_period:
5ea0d750	30	case nlm_drop_reply:
1da177e4 LT	31	break;
	32	case nlm4_deadlock:
	33	status = nlm_lck_denied;
	34	break;
	35	default:
	36	status = nlm_lck_denied_nolocks;
	37	}
	38	}
	39
	40	return (status);
	41	}
	42	#define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
	43	#else
	44	#define cast_status(status) (status)
	45	#endif
	46
	47	/*
	48	* Obtain client and file from arguments
	49	*/
52921e02	50	static __be32
1da177e4 LT	51	nlmsvc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	52	struct nlm_host hostp, struct nlm_file filp)
	53	{
	54	struct nlm_host *host = NULL;
	55	struct nlm_file *file = NULL;
	56	struct nlm_lock *lock = &argp->lock;
52921e02	57	__be32 error = 0;
1da177e4 LT	58
	59	/* nfsd callbacks must have been installed for this procedure */
	60	if (!nlmsvc_ops)
	61	return nlm_lck_denied_nolocks;
	62
	63	/* Obtain host handle */
db4e4c9a	64	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
977faf39	65	\|\| (argp->monitor && nsm_monitor(host) < 0))
1da177e4 LT	66	goto no_locks;
	67	*hostp = host;
	68
	69	/* Obtain file pointer. Not used by FREE_ALL call. */
	70	if (filp != NULL) {
	71	if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
	72	goto no_locks;
	73	*filp = file;
	74
	75	/* Set up the missing parts of the file_lock structure */
	76	lock->fl.fl_file = file->f_file;
	77	lock->fl.fl_owner = (fl_owner_t) host;
	78	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	79	}
	80
	81	return 0;
	82
	83	no_locks:
b0e92aae	84	nlm_release_host(host);
d343fce1 N	85	if (error)
d343fce1 N	86	return error;
1da177e4 LT	87	return nlm_lck_denied_nolocks;
	88	}
	89
	90	/*
	91	* NULL: Test for presence of service
	92	*/
7111c66e	93	static __be32
1da177e4 LT	94	nlmsvc_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	95	{
	96	dprintk("lockd: NULL called\n");
	97	return rpc_success;
	98	}
	99
	100	/*
	101	* TEST: Check for conflicting lock
	102	*/
7111c66e	103	static __be32
1da177e4 LT	104	nlmsvc_proc_test(struct svc_rqst rqstp, struct nlm_args argp,
	105	struct nlm_res *resp)
	106	{
	107	struct nlm_host *host;
	108	struct nlm_file *file;
317602f3	109	__be32 rc = rpc_success;
1da177e4 LT	110
	111	dprintk("lockd: TEST called\n");
	112	resp->cookie = argp->cookie;
	113
1da177e4 LT	114	/* Obtain client and file */
1da177e4 LT	115	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	116	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	117
1da177e4 LT	118	/* Now check for conflicting locks */
8f920d5e	119	resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie));
5ea0d750	120	if (resp->status == nlm_drop_reply)
b7e6b869 OD	121	rc = rpc_drop_reply;
	122	else
	123	dprintk("lockd: TEST status %d vers %d\n",
	124	ntohl(resp->status), rqstp->rq_vers);
1da177e4	125
1da177e4 LT	126	nlm_release_host(host);
1da177e4 LT	127	nlm_release_file(file);
b7e6b869	128	return rc;
1da177e4 LT	129	}
1da177e4 LT	130
7111c66e	131	static __be32
1da177e4 LT	132	nlmsvc_proc_lock(struct svc_rqst rqstp, struct nlm_args argp,
	133	struct nlm_res *resp)
	134	{
	135	struct nlm_host *host;
	136	struct nlm_file *file;
317602f3	137	__be32 rc = rpc_success;
1da177e4 LT	138
	139	dprintk("lockd: LOCK called\n");
	140
	141	resp->cookie = argp->cookie;
	142
1da177e4 LT	143	/* Obtain client and file */
1da177e4 LT	144	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	145	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	146
	147	#if 0
	148	/* If supplied state doesn't match current state, we assume it's
	149	* an old request that time-warped somehow. Any error return would
	150	* do in this case because it's irrelevant anyway.
	151	*
	152	* NB: We don't retrieve the remote host's state yet.
	153	*/
	154	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	155	resp->status = nlm_lck_denied_nolocks;
	156	} else
	157	#endif
	158
	159	/* Now try to lock the file */
6cde4de8	160	resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock,
b2b50289 BF	161	argp->block, &argp->cookie,
b2b50289 BF	162	argp->reclaim));
1a8322b2	163	if (resp->status == nlm_drop_reply)
b7e6b869 OD	164	rc = rpc_drop_reply;
	165	else
	166	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
1da177e4	167
1da177e4 LT	168	nlm_release_host(host);
1da177e4 LT	169	nlm_release_file(file);
b7e6b869	170	return rc;
1da177e4 LT	171	}
1da177e4 LT	172
7111c66e	173	static __be32
1da177e4 LT	174	nlmsvc_proc_cancel(struct svc_rqst rqstp, struct nlm_args argp,
	175	struct nlm_res *resp)
	176	{
	177	struct nlm_host *host;
	178	struct nlm_file *file;
	179
	180	dprintk("lockd: CANCEL called\n");
	181
	182	resp->cookie = argp->cookie;
	183
	184	/* Don't accept requests during grace period */
af558e33	185	if (locks_in_grace()) {
1da177e4 LT	186	resp->status = nlm_lck_denied_grace_period;
	187	return rpc_success;
	188	}
	189
	190	/* Obtain client and file */
	191	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	192	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	193
	194	/* Try to cancel request. */
	195	resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock));
	196
	197	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
	198	nlm_release_host(host);
	199	nlm_release_file(file);
	200	return rpc_success;
	201	}
	202
	203	/*
	204	* UNLOCK: release a lock
	205	*/
7111c66e	206	static __be32
1da177e4 LT	207	nlmsvc_proc_unlock(struct svc_rqst rqstp, struct nlm_args argp,
	208	struct nlm_res *resp)
	209	{
	210	struct nlm_host *host;
	211	struct nlm_file *file;
	212
	213	dprintk("lockd: UNLOCK called\n");
	214
	215	resp->cookie = argp->cookie;
	216
	217	/* Don't accept new lock requests during grace period */
af558e33	218	if (locks_in_grace()) {
1da177e4 LT	219	resp->status = nlm_lck_denied_grace_period;
	220	return rpc_success;
	221	}
	222
	223	/* Obtain client and file */
	224	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	225	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	226
	227	/* Now try to remove the lock */
	228	resp->status = cast_status(nlmsvc_unlock(file, &argp->lock));
	229
	230	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
	231	nlm_release_host(host);
	232	nlm_release_file(file);
	233	return rpc_success;
	234	}
	235
	236	/*
	237	* GRANTED: A server calls us to tell that a process' lock request
	238	* was granted
	239	*/
7111c66e	240	static __be32
1da177e4 LT	241	nlmsvc_proc_granted(struct svc_rqst rqstp, struct nlm_args argp,
	242	struct nlm_res *resp)
	243	{
	244	resp->cookie = argp->cookie;
	245
	246	dprintk("lockd: GRANTED called\n");
dcff09f1	247	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
1da177e4 LT	248	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	249	return rpc_success;
	250	}
	251
d4716624 TM	252	/*
	253	* This is the generic lockd callback for async RPC calls
	254	*/
	255	static void nlmsvc_callback_exit(struct rpc_task task, void data)
	256	{
c041b5ff	257	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	258	-task->tk_status);
	259	}
	260
	261	static void nlmsvc_callback_release(void *data)
	262	{
a86dc496	263	lock_kernel();
d4716624	264	nlm_release_call(data);
a86dc496	265	unlock_kernel();
d4716624 TM	266	}
	267
	268	static const struct rpc_call_ops nlmsvc_callback_ops = {
	269	.rpc_call_done = nlmsvc_callback_exit,
	270	.rpc_release = nlmsvc_callback_release,
	271	};
	272
1da177e4 LT	273	/*
	274	* `Async' versions of the above service routines. They aren't really,
	275	* because we send the callback before the reply proper. I hope this
	276	* doesn't break any clients.
	277	*/
7111c66e AV	278	static __be32 nlmsvc_callback(struct svc_rqst rqstp, u32 proc, struct nlm_args argp,
7111c66e AV	279	__be32 (func)(struct svc_rqst , struct nlm_args , struct nlm_res ))
1da177e4	280	{
d4716624 TM	281	struct nlm_host *host;
d4716624 TM	282	struct nlm_rqst *call;
7111c66e	283	__be32 stat;
1da177e4	284
db4e4c9a OK	285	host = nlmsvc_lookup_host(rqstp,
	286	argp->lock.caller,
	287	argp->lock.len);
d4716624 TM	288	if (host == NULL)
	289	return rpc_system_err;
	290
	291	call = nlm_alloc_call(host);
	292	if (call == NULL)
	293	return rpc_system_err;
	294
	295	stat = func(rqstp, argp, &call->a_res);
	296	if (stat != 0) {
	297	nlm_release_call(call);
	298	return stat;
	299	}
1da177e4	300
d4716624 TM	301	call->a_flags = RPC_TASK_ASYNC;
	302	if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
	303	return rpc_system_err;
	304	return rpc_success;
1da177e4 LT	305	}
1da177e4 LT	306
7111c66e	307	static __be32 nlmsvc_proc_test_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	308	void *resp)
1da177e4 LT	309	{
d4716624 TM	310	dprintk("lockd: TEST_MSG called\n");
	311	return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test);
	312	}
1da177e4	313
7111c66e	314	static __be32 nlmsvc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
d4716624 TM	315	void *resp)
d4716624 TM	316	{
1da177e4	317	dprintk("lockd: LOCK_MSG called\n");
d4716624	318	return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock);
1da177e4 LT	319	}
1da177e4 LT	320
7111c66e	321	static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	322	void *resp)
1da177e4 LT	323	{
1da177e4	324	dprintk("lockd: CANCEL_MSG called\n");
d4716624	325	return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel);
1da177e4 LT	326	}
1da177e4 LT	327
7111c66e	328	static __be32
1da177e4 LT	329	nlmsvc_proc_unlock_msg(struct svc_rqst rqstp, struct nlm_args argp,
	330	void *resp)
	331	{
1da177e4	332	dprintk("lockd: UNLOCK_MSG called\n");
d4716624	333	return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock);
1da177e4 LT	334	}
1da177e4 LT	335
7111c66e	336	static __be32
1da177e4 LT	337	nlmsvc_proc_granted_msg(struct svc_rqst rqstp, struct nlm_args argp,
	338	void *resp)
	339	{
1da177e4	340	dprintk("lockd: GRANTED_MSG called\n");
d4716624	341	return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted);
1da177e4 LT	342	}
	343
	344	/*
	345	* SHARE: create a DOS share or alter existing share.
	346	*/
7111c66e	347	static __be32
1da177e4 LT	348	nlmsvc_proc_share(struct svc_rqst rqstp, struct nlm_args argp,
	349	struct nlm_res *resp)
	350	{
	351	struct nlm_host *host;
	352	struct nlm_file *file;
	353
	354	dprintk("lockd: SHARE called\n");
	355
	356	resp->cookie = argp->cookie;
	357
	358	/* Don't accept new lock requests during grace period */
af558e33	359	if (locks_in_grace() && !argp->reclaim) {
1da177e4 LT	360	resp->status = nlm_lck_denied_grace_period;
	361	return rpc_success;
	362	}
	363
	364	/* Obtain client and file */
	365	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	366	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	367
	368	/* Now try to create the share */
	369	resp->status = cast_status(nlmsvc_share_file(host, file, argp));
	370
	371	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
	372	nlm_release_host(host);
	373	nlm_release_file(file);
	374	return rpc_success;
	375	}
	376
	377	/*
	378	* UNSHARE: Release a DOS share.
	379	*/
7111c66e	380	static __be32
1da177e4 LT	381	nlmsvc_proc_unshare(struct svc_rqst rqstp, struct nlm_args argp,
	382	struct nlm_res *resp)
	383	{
	384	struct nlm_host *host;
	385	struct nlm_file *file;
	386
	387	dprintk("lockd: UNSHARE called\n");
	388
	389	resp->cookie = argp->cookie;
	390
	391	/* Don't accept requests during grace period */
af558e33	392	if (locks_in_grace()) {
1da177e4 LT	393	resp->status = nlm_lck_denied_grace_period;
	394	return rpc_success;
	395	}
	396
	397	/* Obtain client and file */
	398	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	399	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	400
	401	/* Now try to unshare the file */
	402	resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
	403
	404	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
	405	nlm_release_host(host);
	406	nlm_release_file(file);
	407	return rpc_success;
	408	}
	409
	410	/*
	411	* NM_LOCK: Create an unmonitored lock
	412	*/
7111c66e	413	static __be32
1da177e4 LT	414	nlmsvc_proc_nm_lock(struct svc_rqst rqstp, struct nlm_args argp,
	415	struct nlm_res *resp)
	416	{
	417	dprintk("lockd: NM_LOCK called\n");
	418
	419	argp->monitor = 0; /* just clean the monitor flag */
	420	return nlmsvc_proc_lock(rqstp, argp, resp);
	421	}
	422
	423	/*
	424	* FREE_ALL: Release all locks and shares held by client
	425	*/
7111c66e	426	static __be32
1da177e4 LT	427	nlmsvc_proc_free_all(struct svc_rqst rqstp, struct nlm_args argp,
	428	void *resp)
	429	{
	430	struct nlm_host *host;
	431
	432	/* Obtain client */
	433	if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
	434	return rpc_success;
	435
	436	nlmsvc_free_host_resources(host);
	437	nlm_release_host(host);
	438	return rpc_success;
	439	}
	440
	441	/*
	442	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	443	*/
7111c66e	444	static __be32
1da177e4 LT	445	nlmsvc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
	446	void *resp)
	447	{
1da177e4	448	dprintk("lockd: SM_NOTIFY called\n");
b85e4676 CL	449
b85e4676 CL	450	if (!nlm_privileged_requester(rqstp)) {
ad06e4bd CL	451	char buf[RPC_MAX_ADDRBUFLEN];
	452	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	453	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	454	return rpc_system_err;
	455	}
	456
7fefc9cb	457	nlm_host_rebooted(argp);
1da177e4 LT	458	return rpc_success;
	459	}
	460
	461	/*
	462	* client sent a GRANTED_RES, let's remove the associated block
	463	*/
7111c66e	464	static __be32
1da177e4 LT	465	nlmsvc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
	466	void *resp)
	467	{
	468	if (!nlmsvc_ops)
	469	return rpc_success;
	470
	471	dprintk("lockd: GRANTED_RES called\n");
	472
39be4502	473	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	474	return rpc_success;
	475	}
	476
1da177e4 LT	477	/*
	478	* NLM Server procedures.
	479	*/
	480
	481	#define nlmsvc_encode_norep nlmsvc_encode_void
	482	#define nlmsvc_decode_norep nlmsvc_decode_void
	483	#define nlmsvc_decode_testres nlmsvc_decode_void
	484	#define nlmsvc_decode_lockres nlmsvc_decode_void
	485	#define nlmsvc_decode_unlockres nlmsvc_decode_void
	486	#define nlmsvc_decode_cancelres nlmsvc_decode_void
	487	#define nlmsvc_decode_grantedres nlmsvc_decode_void
	488
	489	#define nlmsvc_proc_none nlmsvc_proc_null
	490	#define nlmsvc_proc_test_res nlmsvc_proc_null
	491	#define nlmsvc_proc_lock_res nlmsvc_proc_null
	492	#define nlmsvc_proc_cancel_res nlmsvc_proc_null
	493	#define nlmsvc_proc_unlock_res nlmsvc_proc_null
	494
	495	struct nlm_void { int dummy; };
	496
	497	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	498	{ .pc_func = (svc_procfunc) nlmsvc_proc_##name, \
	499	.pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \
	500	.pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \
	501	.pc_release = NULL, \
	502	.pc_argsize = sizeof(struct nlm_##argt), \
	503	.pc_ressize = sizeof(struct nlm_##rest), \
	504	.pc_xdrressize = respsize, \
	505	}
	506
	507	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	508	#define St 1 /* status */
	509	#define No (1+1024/4) /* Net Obj */
	510	#define Rg 2 /* range - offset + size */
	511
	512	struct svc_procedure nlmsvc_procedures[] = {
	513	PROC(null, void, void, void, void, 1),
	514	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	515	PROC(lock, lockargs, res, args, res, Ck+St),
	516	PROC(cancel, cancargs, res, args, res, Ck+St),
	517	PROC(unlock, unlockargs, res, args, res, Ck+St),
	518	PROC(granted, testargs, res, args, res, Ck+St),
	519	PROC(test_msg, testargs, norep, args, void, 1),
	520	PROC(lock_msg, lockargs, norep, args, void, 1),
	521	PROC(cancel_msg, cancargs, norep, args, void, 1),
	522	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	523	PROC(granted_msg, testargs, norep, args, void, 1),
	524	PROC(test_res, testres, norep, res, void, 1),
	525	PROC(lock_res, lockres, norep, res, void, 1),
	526	PROC(cancel_res, cancelres, norep, res, void, 1),
	527	PROC(unlock_res, unlockres, norep, res, void, 1),
	528	PROC(granted_res, res, norep, res, void, 1),
	529	/* statd callback */
	530	PROC(sm_notify, reboot, void, reboot, void, 1),
	531	PROC(none, void, void, void, void, 1),
	532	PROC(none, void, void, void, void, 1),
	533	PROC(none, void, void, void, void, 1),
	534	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	535	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	536	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	537	PROC(free_all, notify, void, args, void, 0),
	538
	539	};