[deliverable/linux.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/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)
{
	nlm_release_call(data);
}

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