[linux-2.6-block.git] / fs / lockd / svc4proc.c

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

#include <linux/types.h>
#include <linux/time.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/share.h>

#define NLMDBG_FACILITY		NLMDBG_CLIENT

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

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

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

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

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

	return 0;

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

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

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

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

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

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

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

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

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

	resp->cookie = argp->cookie;

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

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

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

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

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

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

	resp->cookie = argp->cookie;

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

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

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

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

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

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

	resp->cookie = argp->cookie;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	resp->cookie = argp->cookie;

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

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

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

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

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

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

	resp->cookie = argp->cookie;

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

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

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

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

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

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

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

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

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

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

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

	nlm_host_rebooted(argp);
	return rpc_success;
}

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

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

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


/*
 * NLM Server procedures.
 */

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

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

struct nlm_void			{ int dummy; };

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

};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/lockd/svc4proc.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
	10	#include <linux/types.h>
	11	#include <linux/time.h>
	12	#include <linux/slab.h>
405f5571	13	#include <linux/smp_lock.h>
1da177e4 LT	14	#include <linux/lockd/lockd.h>
1da177e4 LT	15	#include <linux/lockd/share.h>
1da177e4 LT	16
	17	#define NLMDBG_FACILITY NLMDBG_CLIENT
	18
1da177e4 LT	19	/*
	20	* Obtain client and file from arguments
	21	*/
52921e02	22	static __be32
1da177e4 LT	23	nlm4svc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	24	struct nlm_host hostp, struct nlm_file filp)
	25	{
	26	struct nlm_host *host = NULL;
	27	struct nlm_file *file = NULL;
	28	struct nlm_lock *lock = &argp->lock;
52921e02	29	__be32 error = 0;
1da177e4 LT	30
	31	/* nfsd callbacks must have been installed for this procedure */
	32	if (!nlmsvc_ops)
	33	return nlm_lck_denied_nolocks;
	34
	35	/* Obtain host handle */
db4e4c9a	36	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
977faf39	37	\|\| (argp->monitor && nsm_monitor(host) < 0))
1da177e4 LT	38	goto no_locks;
	39	*hostp = host;
	40
	41	/* Obtain file pointer. Not used by FREE_ALL call. */
	42	if (filp != NULL) {
	43	if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
	44	goto no_locks;
	45	*filp = file;
	46
	47	/* Set up the missing parts of the file_lock structure */
	48	lock->fl.fl_file = file->f_file;
	49	lock->fl.fl_owner = (fl_owner_t) host;
	50	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	51	}
	52
	53	return 0;
	54
	55	no_locks:
b0e92aae	56	nlm_release_host(host);
1da177e4 LT	57	if (error)
	58	return error;
	59	return nlm_lck_denied_nolocks;
	60	}
	61
	62	/*
	63	* NULL: Test for presence of service
	64	*/
7111c66e	65	static __be32
1da177e4 LT	66	nlm4svc_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	67	{
	68	dprintk("lockd: NULL called\n");
	69	return rpc_success;
	70	}
	71
	72	/*
	73	* TEST: Check for conflicting lock
	74	*/
7111c66e	75	static __be32
1da177e4 LT	76	nlm4svc_proc_test(struct svc_rqst rqstp, struct nlm_args argp,
	77	struct nlm_res *resp)
	78	{
	79	struct nlm_host *host;
	80	struct nlm_file *file;
317602f3	81	__be32 rc = rpc_success;
1da177e4 LT	82
	83	dprintk("lockd: TEST4 called\n");
	84	resp->cookie = argp->cookie;
	85
1da177e4 LT	86	/* Obtain client and file */
1da177e4 LT	87	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	88	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	89
1da177e4 LT	90	/* Now check for conflicting locks */
8f920d5e	91	resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
5ea0d750	92	if (resp->status == nlm_drop_reply)
b7e6b869 OD	93	rc = rpc_drop_reply;
	94	else
	95	dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
1da177e4	96
1da177e4 LT	97	nlm_release_host(host);
1da177e4 LT	98	nlm_release_file(file);
b7e6b869	99	return rc;
1da177e4 LT	100	}
1da177e4 LT	101
7111c66e	102	static __be32
1da177e4 LT	103	nlm4svc_proc_lock(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: LOCK called\n");
	111
	112	resp->cookie = argp->cookie;
	113
1da177e4 LT	114	/* Obtain client and file */
1da177e4 LT	115	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	116	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	117
	118	#if 0
	119	/* If supplied state doesn't match current state, we assume it's
	120	* an old request that time-warped somehow. Any error return would
	121	* do in this case because it's irrelevant anyway.
	122	*
	123	* NB: We don't retrieve the remote host's state yet.
	124	*/
	125	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	126	resp->status = nlm_lck_denied_nolocks;
	127	} else
	128	#endif
	129
	130	/* Now try to lock the file */
6cde4de8	131	resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
b2b50289 BF	132	argp->block, &argp->cookie,
b2b50289 BF	133	argp->reclaim);
1a8322b2	134	if (resp->status == nlm_drop_reply)
b7e6b869 OD	135	rc = rpc_drop_reply;
	136	else
	137	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
1da177e4	138
1da177e4 LT	139	nlm_release_host(host);
1da177e4 LT	140	nlm_release_file(file);
b7e6b869	141	return rc;
1da177e4 LT	142	}
1da177e4 LT	143
7111c66e	144	static __be32
1da177e4 LT	145	nlm4svc_proc_cancel(struct svc_rqst rqstp, struct nlm_args argp,
	146	struct nlm_res *resp)
	147	{
	148	struct nlm_host *host;
	149	struct nlm_file *file;
	150
	151	dprintk("lockd: CANCEL called\n");
	152
	153	resp->cookie = argp->cookie;
	154
	155	/* Don't accept requests during grace period */
af558e33	156	if (locks_in_grace()) {
1da177e4 LT	157	resp->status = nlm_lck_denied_grace_period;
	158	return rpc_success;
	159	}
	160
	161	/* Obtain client and file */
	162	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	163	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	164
	165	/* Try to cancel request. */
	166	resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
	167
	168	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
	169	nlm_release_host(host);
	170	nlm_release_file(file);
	171	return rpc_success;
	172	}
	173
	174	/*
	175	* UNLOCK: release a lock
	176	*/
7111c66e	177	static __be32
1da177e4 LT	178	nlm4svc_proc_unlock(struct svc_rqst rqstp, struct nlm_args argp,
	179	struct nlm_res *resp)
	180	{
	181	struct nlm_host *host;
	182	struct nlm_file *file;
	183
	184	dprintk("lockd: UNLOCK called\n");
	185
	186	resp->cookie = argp->cookie;
	187
	188	/* Don't accept new lock requests during grace period */
af558e33	189	if (locks_in_grace()) {
1da177e4 LT	190	resp->status = nlm_lck_denied_grace_period;
	191	return rpc_success;
	192	}
	193
	194	/* Obtain client and file */
	195	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	196	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	197
	198	/* Now try to remove the lock */
	199	resp->status = nlmsvc_unlock(file, &argp->lock);
	200
	201	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
	202	nlm_release_host(host);
	203	nlm_release_file(file);
	204	return rpc_success;
	205	}
	206
	207	/*
	208	* GRANTED: A server calls us to tell that a process' lock request
	209	* was granted
	210	*/
7111c66e	211	static __be32
1da177e4 LT	212	nlm4svc_proc_granted(struct svc_rqst rqstp, struct nlm_args argp,
	213	struct nlm_res *resp)
	214	{
	215	resp->cookie = argp->cookie;
	216
	217	dprintk("lockd: GRANTED called\n");
dcff09f1	218	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
1da177e4 LT	219	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	220	return rpc_success;
	221	}
	222
d4716624 TM	223	/*
	224	* This is the generic lockd callback for async RPC calls
	225	*/
	226	static void nlm4svc_callback_exit(struct rpc_task task, void data)
	227	{
c041b5ff	228	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	229	-task->tk_status);
	230	}
	231
	232	static void nlm4svc_callback_release(void *data)
	233	{
a86dc496	234	lock_kernel();
d4716624	235	nlm_release_call(data);
a86dc496	236	unlock_kernel();
d4716624 TM	237	}
	238
	239	static const struct rpc_call_ops nlm4svc_callback_ops = {
	240	.rpc_call_done = nlm4svc_callback_exit,
	241	.rpc_release = nlm4svc_callback_release,
	242	};
	243
1da177e4 LT	244	/*
	245	* `Async' versions of the above service routines. They aren't really,
	246	* because we send the callback before the reply proper. I hope this
	247	* doesn't break any clients.
	248	*/
7111c66e AV	249	static __be32 nlm4svc_callback(struct svc_rqst rqstp, u32 proc, struct nlm_args argp,
7111c66e AV	250	__be32 (func)(struct svc_rqst , struct nlm_args , struct nlm_res ))
1da177e4	251	{
d4716624 TM	252	struct nlm_host *host;
d4716624 TM	253	struct nlm_rqst *call;
7111c66e	254	__be32 stat;
1da177e4	255
db4e4c9a OK	256	host = nlmsvc_lookup_host(rqstp,
	257	argp->lock.caller,
	258	argp->lock.len);
d4716624 TM	259	if (host == NULL)
	260	return rpc_system_err;
	261
	262	call = nlm_alloc_call(host);
	263	if (call == NULL)
	264	return rpc_system_err;
	265
	266	stat = func(rqstp, argp, &call->a_res);
	267	if (stat != 0) {
	268	nlm_release_call(call);
	269	return stat;
	270	}
1da177e4	271
d4716624 TM	272	call->a_flags = RPC_TASK_ASYNC;
	273	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
	274	return rpc_system_err;
	275	return rpc_success;
1da177e4 LT	276	}
1da177e4 LT	277
7111c66e	278	static __be32 nlm4svc_proc_test_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	279	void *resp)
1da177e4 LT	280	{
d4716624 TM	281	dprintk("lockd: TEST_MSG called\n");
	282	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
	283	}
1da177e4	284
7111c66e	285	static __be32 nlm4svc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
d4716624 TM	286	void *resp)
d4716624 TM	287	{
1da177e4	288	dprintk("lockd: LOCK_MSG called\n");
d4716624	289	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
1da177e4 LT	290	}
1da177e4 LT	291
7111c66e	292	static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	293	void *resp)
1da177e4 LT	294	{
1da177e4	295	dprintk("lockd: CANCEL_MSG called\n");
d4716624	296	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
1da177e4 LT	297	}
1da177e4 LT	298
7111c66e	299	static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	300	void *resp)
1da177e4 LT	301	{
1da177e4	302	dprintk("lockd: UNLOCK_MSG called\n");
d4716624	303	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
1da177e4 LT	304	}
1da177e4 LT	305
7111c66e	306	static __be32 nlm4svc_proc_granted_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	307	void *resp)
1da177e4 LT	308	{
1da177e4	309	dprintk("lockd: GRANTED_MSG called\n");
d4716624	310	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
1da177e4 LT	311	}
	312
	313	/*
	314	* SHARE: create a DOS share or alter existing share.
	315	*/
7111c66e	316	static __be32
1da177e4 LT	317	nlm4svc_proc_share(struct svc_rqst rqstp, struct nlm_args argp,
	318	struct nlm_res *resp)
	319	{
	320	struct nlm_host *host;
	321	struct nlm_file *file;
	322
	323	dprintk("lockd: SHARE called\n");
	324
	325	resp->cookie = argp->cookie;
	326
	327	/* Don't accept new lock requests during grace period */
af558e33	328	if (locks_in_grace() && !argp->reclaim) {
1da177e4 LT	329	resp->status = nlm_lck_denied_grace_period;
	330	return rpc_success;
	331	}
	332
	333	/* Obtain client and file */
	334	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	335	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	336
	337	/* Now try to create the share */
	338	resp->status = nlmsvc_share_file(host, file, argp);
	339
	340	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
	341	nlm_release_host(host);
	342	nlm_release_file(file);
	343	return rpc_success;
	344	}
	345
	346	/*
	347	* UNSHARE: Release a DOS share.
	348	*/
7111c66e	349	static __be32
1da177e4 LT	350	nlm4svc_proc_unshare(struct svc_rqst rqstp, struct nlm_args argp,
	351	struct nlm_res *resp)
	352	{
	353	struct nlm_host *host;
	354	struct nlm_file *file;
	355
	356	dprintk("lockd: UNSHARE called\n");
	357
	358	resp->cookie = argp->cookie;
	359
	360	/* Don't accept requests during grace period */
af558e33	361	if (locks_in_grace()) {
1da177e4 LT	362	resp->status = nlm_lck_denied_grace_period;
	363	return rpc_success;
	364	}
	365
	366	/* Obtain client and file */
	367	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	368	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	369
	370	/* Now try to lock the file */
	371	resp->status = nlmsvc_unshare_file(host, file, argp);
	372
	373	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
	374	nlm_release_host(host);
	375	nlm_release_file(file);
	376	return rpc_success;
	377	}
	378
	379	/*
	380	* NM_LOCK: Create an unmonitored lock
	381	*/
7111c66e	382	static __be32
1da177e4 LT	383	nlm4svc_proc_nm_lock(struct svc_rqst rqstp, struct nlm_args argp,
	384	struct nlm_res *resp)
	385	{
	386	dprintk("lockd: NM_LOCK called\n");
	387
	388	argp->monitor = 0; /* just clean the monitor flag */
	389	return nlm4svc_proc_lock(rqstp, argp, resp);
	390	}
	391
	392	/*
	393	* FREE_ALL: Release all locks and shares held by client
	394	*/
7111c66e	395	static __be32
1da177e4 LT	396	nlm4svc_proc_free_all(struct svc_rqst rqstp, struct nlm_args argp,
	397	void *resp)
	398	{
	399	struct nlm_host *host;
	400
	401	/* Obtain client */
	402	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
	403	return rpc_success;
	404
	405	nlmsvc_free_host_resources(host);
	406	nlm_release_host(host);
	407	return rpc_success;
	408	}
	409
	410	/*
	411	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	412	*/
7111c66e	413	static __be32
1da177e4 LT	414	nlm4svc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
	415	void *resp)
	416	{
1da177e4	417	dprintk("lockd: SM_NOTIFY called\n");
b85e4676 CL	418
b85e4676 CL	419	if (!nlm_privileged_requester(rqstp)) {
ad06e4bd CL	420	char buf[RPC_MAX_ADDRBUFLEN];
	421	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	422	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	423	return rpc_system_err;
	424	}
	425
7fefc9cb	426	nlm_host_rebooted(argp);
1da177e4 LT	427	return rpc_success;
	428	}
	429
	430	/*
	431	* client sent a GRANTED_RES, let's remove the associated block
	432	*/
7111c66e	433	static __be32
1da177e4 LT	434	nlm4svc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
	435	void *resp)
	436	{
	437	if (!nlmsvc_ops)
	438	return rpc_success;
	439
	440	dprintk("lockd: GRANTED_RES called\n");
	441
39be4502	442	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	443	return rpc_success;
	444	}
	445
	446
1da177e4 LT	447	/*
	448	* NLM Server procedures.
	449	*/
	450
	451	#define nlm4svc_encode_norep nlm4svc_encode_void
	452	#define nlm4svc_decode_norep nlm4svc_decode_void
	453	#define nlm4svc_decode_testres nlm4svc_decode_void
	454	#define nlm4svc_decode_lockres nlm4svc_decode_void
	455	#define nlm4svc_decode_unlockres nlm4svc_decode_void
	456	#define nlm4svc_decode_cancelres nlm4svc_decode_void
	457	#define nlm4svc_decode_grantedres nlm4svc_decode_void
	458
	459	#define nlm4svc_proc_none nlm4svc_proc_null
	460	#define nlm4svc_proc_test_res nlm4svc_proc_null
	461	#define nlm4svc_proc_lock_res nlm4svc_proc_null
	462	#define nlm4svc_proc_cancel_res nlm4svc_proc_null
	463	#define nlm4svc_proc_unlock_res nlm4svc_proc_null
	464
	465	struct nlm_void { int dummy; };
	466
	467	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	468	{ .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
	469	.pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
	470	.pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
	471	.pc_release = NULL, \
	472	.pc_argsize = sizeof(struct nlm_##argt), \
	473	.pc_ressize = sizeof(struct nlm_##rest), \
	474	.pc_xdrressize = respsize, \
	475	}
	476	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	477	#define No (1+1024/4) /* netobj */
	478	#define St 1 /* status */
	479	#define Rg 4 /* range (offset + length) */
	480	struct svc_procedure nlmsvc_procedures4[] = {
	481	PROC(null, void, void, void, void, 1),
	482	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	483	PROC(lock, lockargs, res, args, res, Ck+St),
	484	PROC(cancel, cancargs, res, args, res, Ck+St),
	485	PROC(unlock, unlockargs, res, args, res, Ck+St),
	486	PROC(granted, testargs, res, args, res, Ck+St),
	487	PROC(test_msg, testargs, norep, args, void, 1),
	488	PROC(lock_msg, lockargs, norep, args, void, 1),
	489	PROC(cancel_msg, cancargs, norep, args, void, 1),
	490	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	491	PROC(granted_msg, testargs, norep, args, void, 1),
	492	PROC(test_res, testres, norep, res, void, 1),
	493	PROC(lock_res, lockres, norep, res, void, 1),
	494	PROC(cancel_res, cancelres, norep, res, void, 1),
	495	PROC(unlock_res, unlockres, norep, res, void, 1),
	496	PROC(granted_res, res, norep, res, void, 1),
	497	/* statd callback */
	498	PROC(sm_notify, reboot, void, reboot, void, 1),
	499	PROC(none, void, void, void, void, 0),
	500	PROC(none, void, void, void, void, 0),
	501	PROC(none, void, void, void, void, 0),
	502	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	503	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	504	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	505	PROC(free_all, notify, void, args, void, 1),
	506
	507	};