[linux-2.6-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/lockd/lockd.h>
#include <linux/lockd/share.h>
#include <linux/sunrpc/svc_xprt.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) {
		error = cast_status(nlm_lookup_file(rqstp, &file, &lock->fh));
		if (error != 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:
	nlmsvc_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);

	nlmsvc_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));

	nlmsvc_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;
	struct net *net = SVC_NET(rqstp);

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

	resp->cookie = argp->cookie;

	/* Don't accept requests during grace period */
	if (locks_in_grace(net)) {
		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(net, file, &argp->lock));

	dprintk("lockd: CANCEL        status %d\n", ntohl(resp->status));
	nlmsvc_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;
	struct net *net = SVC_NET(rqstp);

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

	resp->cookie = argp->cookie;

	/* Don't accept new lock requests during grace period */
	if (locks_in_grace(net)) {
		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(net, file, &argp->lock));

	dprintk("lockd: UNLOCK        status %d\n", ntohl(resp->status));
	nlmsvc_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);
}

void nlmsvc_release_call(struct nlm_rqst *call)
{
	if (!atomic_dec_and_test(&call->a_count))
		return;
	nlmsvc_release_host(call->a_host);
	kfree(call);
}

static void nlmsvc_callback_release(void *data)
{
	nlmsvc_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);
	nlmsvc_release_host(host);
	if (call == NULL)
		return rpc_system_err;

	stat = func(rqstp, argp, &call->a_res);
	if (stat != 0) {
		nlmsvc_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(SVC_NET(rqstp)) && !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));
	nlmsvc_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(SVC_NET(rqstp))) {
		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));
	nlmsvc_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);
	nlmsvc_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(SVC_NET(rqstp), 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>
5ccb0066	14	#include <linux/sunrpc/svc_xprt.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) {
cd0b16c1 TM	71	error = cast_status(nlm_lookup_file(rqstp, &file, &lock->fh));
cd0b16c1 TM	72	if (error != 0)
1da177e4 LT	73	goto no_locks;
	74	*filp = file;
	75
	76	/* Set up the missing parts of the file_lock structure */
	77	lock->fl.fl_file = file->f_file;
	78	lock->fl.fl_owner = (fl_owner_t) host;
	79	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	80	}
	81
	82	return 0;
	83
	84	no_locks:
67216b94	85	nlmsvc_release_host(host);
d343fce1 N	86	if (error)
d343fce1 N	87	return error;
1da177e4 LT	88	return nlm_lck_denied_nolocks;
	89	}
	90
	91	/*
	92	* NULL: Test for presence of service
	93	*/
7111c66e	94	static __be32
1da177e4 LT	95	nlmsvc_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	96	{
	97	dprintk("lockd: NULL called\n");
	98	return rpc_success;
	99	}
	100
	101	/*
	102	* TEST: Check for conflicting lock
	103	*/
7111c66e	104	static __be32
1da177e4 LT	105	nlmsvc_proc_test(struct svc_rqst rqstp, struct nlm_args argp,
	106	struct nlm_res *resp)
	107	{
	108	struct nlm_host *host;
	109	struct nlm_file *file;
317602f3	110	__be32 rc = rpc_success;
1da177e4 LT	111
	112	dprintk("lockd: TEST called\n");
	113	resp->cookie = argp->cookie;
	114
1da177e4 LT	115	/* Obtain client and file */
1da177e4 LT	116	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	117	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	118
1da177e4 LT	119	/* Now check for conflicting locks */
8f920d5e	120	resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie));
5ea0d750	121	if (resp->status == nlm_drop_reply)
b7e6b869 OD	122	rc = rpc_drop_reply;
	123	else
	124	dprintk("lockd: TEST status %d vers %d\n",
	125	ntohl(resp->status), rqstp->rq_vers);
1da177e4	126
67216b94	127	nlmsvc_release_host(host);
1da177e4	128	nlm_release_file(file);
b7e6b869	129	return rc;
1da177e4 LT	130	}
1da177e4 LT	131
7111c66e	132	static __be32
1da177e4 LT	133	nlmsvc_proc_lock(struct svc_rqst rqstp, struct nlm_args argp,
	134	struct nlm_res *resp)
	135	{
	136	struct nlm_host *host;
	137	struct nlm_file *file;
317602f3	138	__be32 rc = rpc_success;
1da177e4 LT	139
	140	dprintk("lockd: LOCK called\n");
	141
	142	resp->cookie = argp->cookie;
	143
1da177e4 LT	144	/* Obtain client and file */
1da177e4 LT	145	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	146	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	147
	148	#if 0
	149	/* If supplied state doesn't match current state, we assume it's
	150	* an old request that time-warped somehow. Any error return would
	151	* do in this case because it's irrelevant anyway.
	152	*
	153	* NB: We don't retrieve the remote host's state yet.
	154	*/
	155	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	156	resp->status = nlm_lck_denied_nolocks;
	157	} else
	158	#endif
	159
	160	/* Now try to lock the file */
6cde4de8	161	resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock,
b2b50289 BF	162	argp->block, &argp->cookie,
b2b50289 BF	163	argp->reclaim));
1a8322b2	164	if (resp->status == nlm_drop_reply)
b7e6b869 OD	165	rc = rpc_drop_reply;
	166	else
	167	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
1da177e4	168
67216b94	169	nlmsvc_release_host(host);
1da177e4	170	nlm_release_file(file);
b7e6b869	171	return rc;
1da177e4 LT	172	}
1da177e4 LT	173
7111c66e	174	static __be32
1da177e4 LT	175	nlmsvc_proc_cancel(struct svc_rqst rqstp, struct nlm_args argp,
	176	struct nlm_res *resp)
	177	{
	178	struct nlm_host *host;
	179	struct nlm_file *file;
5ccb0066	180	struct net *net = SVC_NET(rqstp);
1da177e4 LT	181
	182	dprintk("lockd: CANCEL called\n");
	183
	184	resp->cookie = argp->cookie;
	185
	186	/* Don't accept requests during grace period */
5ccb0066	187	if (locks_in_grace(net)) {
1da177e4 LT	188	resp->status = nlm_lck_denied_grace_period;
	189	return rpc_success;
	190	}
	191
	192	/* Obtain client and file */
	193	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	194	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	195
1da177e4 LT	196	/* Try to cancel request. */
5ccb0066	197	resp->status = cast_status(nlmsvc_cancel_blocked(net, file, &argp->lock));
1da177e4 LT	198
1da177e4 LT	199	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
67216b94	200	nlmsvc_release_host(host);
1da177e4 LT	201	nlm_release_file(file);
	202	return rpc_success;
	203	}
	204
	205	/*
	206	* UNLOCK: release a lock
	207	*/
7111c66e	208	static __be32
1da177e4 LT	209	nlmsvc_proc_unlock(struct svc_rqst rqstp, struct nlm_args argp,
	210	struct nlm_res *resp)
	211	{
	212	struct nlm_host *host;
	213	struct nlm_file *file;
5ccb0066	214	struct net *net = SVC_NET(rqstp);
1da177e4 LT	215
	216	dprintk("lockd: UNLOCK called\n");
	217
	218	resp->cookie = argp->cookie;
	219
	220	/* Don't accept new lock requests during grace period */
5ccb0066	221	if (locks_in_grace(net)) {
1da177e4 LT	222	resp->status = nlm_lck_denied_grace_period;
	223	return rpc_success;
	224	}
	225
	226	/* Obtain client and file */
	227	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	228	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	229
1da177e4 LT	230	/* Now try to remove the lock */
5ccb0066	231	resp->status = cast_status(nlmsvc_unlock(net, file, &argp->lock));
1da177e4 LT	232
1da177e4 LT	233	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
67216b94	234	nlmsvc_release_host(host);
1da177e4 LT	235	nlm_release_file(file);
	236	return rpc_success;
	237	}
	238
	239	/*
	240	* GRANTED: A server calls us to tell that a process' lock request
	241	* was granted
	242	*/
7111c66e	243	static __be32
1da177e4 LT	244	nlmsvc_proc_granted(struct svc_rqst rqstp, struct nlm_args argp,
	245	struct nlm_res *resp)
	246	{
	247	resp->cookie = argp->cookie;
	248
	249	dprintk("lockd: GRANTED called\n");
dcff09f1	250	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
1da177e4 LT	251	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	252	return rpc_success;
	253	}
	254
d4716624 TM	255	/*
	256	* This is the generic lockd callback for async RPC calls
	257	*/
	258	static void nlmsvc_callback_exit(struct rpc_task task, void data)
	259	{
c041b5ff	260	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	261	-task->tk_status);
	262	}
	263
7db836d4 CL	264	void nlmsvc_release_call(struct nlm_rqst *call)
	265	{
	266	if (!atomic_dec_and_test(&call->a_count))
	267	return;
67216b94	268	nlmsvc_release_host(call->a_host);
7db836d4 CL	269	kfree(call);
	270	}
	271
d4716624 TM	272	static void nlmsvc_callback_release(void *data)
d4716624 TM	273	{
7db836d4	274	nlmsvc_release_call(data);
d4716624 TM	275	}
	276
	277	static const struct rpc_call_ops nlmsvc_callback_ops = {
	278	.rpc_call_done = nlmsvc_callback_exit,
	279	.rpc_release = nlmsvc_callback_release,
	280	};
	281
1da177e4 LT	282	/*
	283	* `Async' versions of the above service routines. They aren't really,
	284	* because we send the callback before the reply proper. I hope this
	285	* doesn't break any clients.
	286	*/
7111c66e AV	287	static __be32 nlmsvc_callback(struct svc_rqst rqstp, u32 proc, struct nlm_args argp,
7111c66e AV	288	__be32 (func)(struct svc_rqst , struct nlm_args , struct nlm_res ))
1da177e4	289	{
d4716624 TM	290	struct nlm_host *host;
d4716624 TM	291	struct nlm_rqst *call;
7111c66e	292	__be32 stat;
1da177e4	293
db4e4c9a OK	294	host = nlmsvc_lookup_host(rqstp,
	295	argp->lock.caller,
	296	argp->lock.len);
d4716624 TM	297	if (host == NULL)
	298	return rpc_system_err;
	299
	300	call = nlm_alloc_call(host);
446945ab	301	nlmsvc_release_host(host);
d4716624 TM	302	if (call == NULL)
	303	return rpc_system_err;
	304
	305	stat = func(rqstp, argp, &call->a_res);
	306	if (stat != 0) {
7db836d4	307	nlmsvc_release_call(call);
d4716624 TM	308	return stat;
d4716624 TM	309	}
1da177e4	310
d4716624 TM	311	call->a_flags = RPC_TASK_ASYNC;
	312	if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
	313	return rpc_system_err;
	314	return rpc_success;
1da177e4 LT	315	}
1da177e4 LT	316
7111c66e	317	static __be32 nlmsvc_proc_test_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	318	void *resp)
1da177e4 LT	319	{
d4716624 TM	320	dprintk("lockd: TEST_MSG called\n");
	321	return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test);
	322	}
1da177e4	323
7111c66e	324	static __be32 nlmsvc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
d4716624 TM	325	void *resp)
d4716624 TM	326	{
1da177e4	327	dprintk("lockd: LOCK_MSG called\n");
d4716624	328	return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock);
1da177e4 LT	329	}
1da177e4 LT	330
7111c66e	331	static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	332	void *resp)
1da177e4 LT	333	{
1da177e4	334	dprintk("lockd: CANCEL_MSG called\n");
d4716624	335	return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel);
1da177e4 LT	336	}
1da177e4 LT	337
7111c66e	338	static __be32
1da177e4 LT	339	nlmsvc_proc_unlock_msg(struct svc_rqst rqstp, struct nlm_args argp,
	340	void *resp)
	341	{
1da177e4	342	dprintk("lockd: UNLOCK_MSG called\n");
d4716624	343	return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock);
1da177e4 LT	344	}
1da177e4 LT	345
7111c66e	346	static __be32
1da177e4 LT	347	nlmsvc_proc_granted_msg(struct svc_rqst rqstp, struct nlm_args argp,
	348	void *resp)
	349	{
1da177e4	350	dprintk("lockd: GRANTED_MSG called\n");
d4716624	351	return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted);
1da177e4 LT	352	}
	353
	354	/*
	355	* SHARE: create a DOS share or alter existing share.
	356	*/
7111c66e	357	static __be32
1da177e4 LT	358	nlmsvc_proc_share(struct svc_rqst rqstp, struct nlm_args argp,
	359	struct nlm_res *resp)
	360	{
	361	struct nlm_host *host;
	362	struct nlm_file *file;
	363
	364	dprintk("lockd: SHARE called\n");
	365
	366	resp->cookie = argp->cookie;
	367
	368	/* Don't accept new lock requests during grace period */
5ccb0066	369	if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
1da177e4 LT	370	resp->status = nlm_lck_denied_grace_period;
	371	return rpc_success;
	372	}
	373
	374	/* Obtain client and file */
	375	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	376	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	377
	378	/* Now try to create the share */
	379	resp->status = cast_status(nlmsvc_share_file(host, file, argp));
	380
	381	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
67216b94	382	nlmsvc_release_host(host);
1da177e4 LT	383	nlm_release_file(file);
	384	return rpc_success;
	385	}
	386
	387	/*
	388	* UNSHARE: Release a DOS share.
	389	*/
7111c66e	390	static __be32
1da177e4 LT	391	nlmsvc_proc_unshare(struct svc_rqst rqstp, struct nlm_args argp,
	392	struct nlm_res *resp)
	393	{
	394	struct nlm_host *host;
	395	struct nlm_file *file;
	396
	397	dprintk("lockd: UNSHARE called\n");
	398
	399	resp->cookie = argp->cookie;
	400
	401	/* Don't accept requests during grace period */
5ccb0066	402	if (locks_in_grace(SVC_NET(rqstp))) {
1da177e4 LT	403	resp->status = nlm_lck_denied_grace_period;
	404	return rpc_success;
	405	}
	406
	407	/* Obtain client and file */
	408	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	409	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	410
	411	/* Now try to unshare the file */
	412	resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
	413
	414	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
67216b94	415	nlmsvc_release_host(host);
1da177e4 LT	416	nlm_release_file(file);
	417	return rpc_success;
	418	}
	419
	420	/*
	421	* NM_LOCK: Create an unmonitored lock
	422	*/
7111c66e	423	static __be32
1da177e4 LT	424	nlmsvc_proc_nm_lock(struct svc_rqst rqstp, struct nlm_args argp,
	425	struct nlm_res *resp)
	426	{
	427	dprintk("lockd: NM_LOCK called\n");
	428
	429	argp->monitor = 0; /* just clean the monitor flag */
	430	return nlmsvc_proc_lock(rqstp, argp, resp);
	431	}
	432
	433	/*
	434	* FREE_ALL: Release all locks and shares held by client
	435	*/
7111c66e	436	static __be32
1da177e4 LT	437	nlmsvc_proc_free_all(struct svc_rqst rqstp, struct nlm_args argp,
	438	void *resp)
	439	{
	440	struct nlm_host *host;
	441
	442	/* Obtain client */
	443	if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
	444	return rpc_success;
	445
	446	nlmsvc_free_host_resources(host);
67216b94	447	nlmsvc_release_host(host);
1da177e4 LT	448	return rpc_success;
	449	}
	450
	451	/*
	452	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	453	*/
7111c66e	454	static __be32
1da177e4 LT	455	nlmsvc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
	456	void *resp)
	457	{
1da177e4	458	dprintk("lockd: SM_NOTIFY called\n");
b85e4676 CL	459
b85e4676 CL	460	if (!nlm_privileged_requester(rqstp)) {
ad06e4bd CL	461	char buf[RPC_MAX_ADDRBUFLEN];
	462	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	463	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	464	return rpc_system_err;
	465	}
	466
0ad95472	467	nlm_host_rebooted(SVC_NET(rqstp), argp);
1da177e4 LT	468	return rpc_success;
	469	}
	470
	471	/*
	472	* client sent a GRANTED_RES, let's remove the associated block
	473	*/
7111c66e	474	static __be32
1da177e4 LT	475	nlmsvc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
	476	void *resp)
	477	{
	478	if (!nlmsvc_ops)
	479	return rpc_success;
	480
	481	dprintk("lockd: GRANTED_RES called\n");
	482
39be4502	483	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	484	return rpc_success;
	485	}
	486
1da177e4 LT	487	/*
	488	* NLM Server procedures.
	489	*/
	490
	491	#define nlmsvc_encode_norep nlmsvc_encode_void
	492	#define nlmsvc_decode_norep nlmsvc_decode_void
	493	#define nlmsvc_decode_testres nlmsvc_decode_void
	494	#define nlmsvc_decode_lockres nlmsvc_decode_void
	495	#define nlmsvc_decode_unlockres nlmsvc_decode_void
	496	#define nlmsvc_decode_cancelres nlmsvc_decode_void
	497	#define nlmsvc_decode_grantedres nlmsvc_decode_void
	498
	499	#define nlmsvc_proc_none nlmsvc_proc_null
	500	#define nlmsvc_proc_test_res nlmsvc_proc_null
	501	#define nlmsvc_proc_lock_res nlmsvc_proc_null
	502	#define nlmsvc_proc_cancel_res nlmsvc_proc_null
	503	#define nlmsvc_proc_unlock_res nlmsvc_proc_null
	504
	505	struct nlm_void { int dummy; };
	506
	507	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	508	{ .pc_func = (svc_procfunc) nlmsvc_proc_##name, \
	509	.pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \
	510	.pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \
	511	.pc_release = NULL, \
	512	.pc_argsize = sizeof(struct nlm_##argt), \
	513	.pc_ressize = sizeof(struct nlm_##rest), \
	514	.pc_xdrressize = respsize, \
	515	}
	516
	517	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	518	#define St 1 /* status */
	519	#define No (1+1024/4) /* Net Obj */
	520	#define Rg 2 /* range - offset + size */
	521
	522	struct svc_procedure nlmsvc_procedures[] = {
	523	PROC(null, void, void, void, void, 1),
	524	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	525	PROC(lock, lockargs, res, args, res, Ck+St),
	526	PROC(cancel, cancargs, res, args, res, Ck+St),
	527	PROC(unlock, unlockargs, res, args, res, Ck+St),
	528	PROC(granted, testargs, res, args, res, Ck+St),
	529	PROC(test_msg, testargs, norep, args, void, 1),
	530	PROC(lock_msg, lockargs, norep, args, void, 1),
	531	PROC(cancel_msg, cancargs, norep, args, void, 1),
	532	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	533	PROC(granted_msg, testargs, norep, args, void, 1),
	534	PROC(test_res, testres, norep, res, void, 1),
	535	PROC(lock_res, lockres, norep, res, void, 1),
	536	PROC(cancel_res, cancelres, norep, res, void, 1),
	537	PROC(unlock_res, unlockres, norep, res, void, 1),
	538	PROC(granted_res, res, norep, res, void, 1),
	539	/* statd callback */
	540	PROC(sm_notify, reboot, void, reboot, void, 1),
	541	PROC(none, void, void, void, void, 1),
	542	PROC(none, void, void, void, void, 1),
	543	PROC(none, void, void, void, void, 1),
	544	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	545	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	546	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	547	PROC(free_all, notify, void, args, void, 0),
	548
	549	};