[mirror_ubuntu-zesty-kernel.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/lockd/lockd.h>
#include <linux/lockd/share.h>
#include <linux/sunrpc/svc_xprt.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:
	nlmsvc_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));

	nlmsvc_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));

	nlmsvc_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(SVC_NET(rqstp))) {
		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(SVC_NET(rqstp), 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
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(SVC_NET(rqstp))) {
		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(SVC_NET(rqstp), 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
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)
{
	nlmsvc_release_call(data);
}

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);
	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, &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(SVC_NET(rqstp)) && !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));
	nlmsvc_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(SVC_NET(rqstp))) {
		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));
	nlmsvc_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);
	nlmsvc_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(SVC_NET(rqstp), 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>
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 LT	18	/*
	19	* Obtain client and file from arguments
	20	*/
52921e02	21	static __be32
1da177e4 LT	22	nlm4svc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	23	struct nlm_host hostp, struct nlm_file filp)
	24	{
	25	struct nlm_host *host = NULL;
	26	struct nlm_file *file = NULL;
	27	struct nlm_lock *lock = &argp->lock;
52921e02	28	__be32 error = 0;
1da177e4 LT	29
	30	/* nfsd callbacks must have been installed for this procedure */
	31	if (!nlmsvc_ops)
	32	return nlm_lck_denied_nolocks;
	33
	34	/* Obtain host handle */
db4e4c9a	35	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
977faf39	36	\|\| (argp->monitor && nsm_monitor(host) < 0))
1da177e4 LT	37	goto no_locks;
	38	*hostp = host;
	39
	40	/* Obtain file pointer. Not used by FREE_ALL call. */
	41	if (filp != NULL) {
	42	if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
	43	goto no_locks;
	44	*filp = file;
	45
	46	/* Set up the missing parts of the file_lock structure */
	47	lock->fl.fl_file = file->f_file;
	48	lock->fl.fl_owner = (fl_owner_t) host;
	49	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	50	}
	51
	52	return 0;
	53
	54	no_locks:
67216b94	55	nlmsvc_release_host(host);
1da177e4 LT	56	if (error)
	57	return error;
	58	return nlm_lck_denied_nolocks;
	59	}
	60
	61	/*
	62	* NULL: Test for presence of service
	63	*/
7111c66e	64	static __be32
1da177e4 LT	65	nlm4svc_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	66	{
	67	dprintk("lockd: NULL called\n");
	68	return rpc_success;
	69	}
	70
	71	/*
	72	* TEST: Check for conflicting lock
	73	*/
7111c66e	74	static __be32
1da177e4 LT	75	nlm4svc_proc_test(struct svc_rqst rqstp, struct nlm_args argp,
	76	struct nlm_res *resp)
	77	{
	78	struct nlm_host *host;
	79	struct nlm_file *file;
317602f3	80	__be32 rc = rpc_success;
1da177e4 LT	81
	82	dprintk("lockd: TEST4 called\n");
	83	resp->cookie = argp->cookie;
	84
1da177e4 LT	85	/* Obtain client and file */
1da177e4 LT	86	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	87	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	88
1da177e4 LT	89	/* Now check for conflicting locks */
8f920d5e	90	resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
5ea0d750	91	if (resp->status == nlm_drop_reply)
b7e6b869 OD	92	rc = rpc_drop_reply;
	93	else
	94	dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
1da177e4	95
67216b94	96	nlmsvc_release_host(host);
1da177e4	97	nlm_release_file(file);
b7e6b869	98	return rc;
1da177e4 LT	99	}
1da177e4 LT	100
7111c66e	101	static __be32
1da177e4 LT	102	nlm4svc_proc_lock(struct svc_rqst rqstp, struct nlm_args argp,
	103	struct nlm_res *resp)
	104	{
	105	struct nlm_host *host;
	106	struct nlm_file *file;
317602f3	107	__be32 rc = rpc_success;
1da177e4 LT	108
	109	dprintk("lockd: LOCK called\n");
	110
	111	resp->cookie = argp->cookie;
	112
1da177e4 LT	113	/* Obtain client and file */
1da177e4 LT	114	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	115	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	116
	117	#if 0
	118	/* If supplied state doesn't match current state, we assume it's
	119	* an old request that time-warped somehow. Any error return would
	120	* do in this case because it's irrelevant anyway.
	121	*
	122	* NB: We don't retrieve the remote host's state yet.
	123	*/
	124	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	125	resp->status = nlm_lck_denied_nolocks;
	126	} else
	127	#endif
	128
	129	/* Now try to lock the file */
6cde4de8	130	resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
b2b50289 BF	131	argp->block, &argp->cookie,
b2b50289 BF	132	argp->reclaim);
1a8322b2	133	if (resp->status == nlm_drop_reply)
b7e6b869 OD	134	rc = rpc_drop_reply;
	135	else
	136	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
1da177e4	137
67216b94	138	nlmsvc_release_host(host);
1da177e4	139	nlm_release_file(file);
b7e6b869	140	return rc;
1da177e4 LT	141	}
1da177e4 LT	142
7111c66e	143	static __be32
1da177e4 LT	144	nlm4svc_proc_cancel(struct svc_rqst rqstp, struct nlm_args argp,
	145	struct nlm_res *resp)
	146	{
	147	struct nlm_host *host;
	148	struct nlm_file *file;
	149
	150	dprintk("lockd: CANCEL called\n");
	151
	152	resp->cookie = argp->cookie;
	153
	154	/* Don't accept requests during grace period */
5ccb0066	155	if (locks_in_grace(SVC_NET(rqstp))) {
1da177e4 LT	156	resp->status = nlm_lck_denied_grace_period;
	157	return rpc_success;
	158	}
	159
	160	/* Obtain client and file */
	161	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	162	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	163
1da177e4 LT	164	/* Try to cancel request. */
5ccb0066	165	resp->status = nlmsvc_cancel_blocked(SVC_NET(rqstp), file, &argp->lock);
1da177e4 LT	166
1da177e4 LT	167	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
67216b94	168	nlmsvc_release_host(host);
1da177e4 LT	169	nlm_release_file(file);
	170	return rpc_success;
	171	}
	172
	173	/*
	174	* UNLOCK: release a lock
	175	*/
7111c66e	176	static __be32
1da177e4 LT	177	nlm4svc_proc_unlock(struct svc_rqst rqstp, struct nlm_args argp,
	178	struct nlm_res *resp)
	179	{
	180	struct nlm_host *host;
	181	struct nlm_file *file;
	182
	183	dprintk("lockd: UNLOCK called\n");
	184
	185	resp->cookie = argp->cookie;
	186
	187	/* Don't accept new lock requests during grace period */
5ccb0066	188	if (locks_in_grace(SVC_NET(rqstp))) {
1da177e4 LT	189	resp->status = nlm_lck_denied_grace_period;
	190	return rpc_success;
	191	}
	192
	193	/* Obtain client and file */
	194	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	195	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	196
1da177e4 LT	197	/* Now try to remove the lock */
5ccb0066	198	resp->status = nlmsvc_unlock(SVC_NET(rqstp), file, &argp->lock);
1da177e4 LT	199
1da177e4 LT	200	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
67216b94	201	nlmsvc_release_host(host);
1da177e4 LT	202	nlm_release_file(file);
	203	return rpc_success;
	204	}
	205
	206	/*
	207	* GRANTED: A server calls us to tell that a process' lock request
	208	* was granted
	209	*/
7111c66e	210	static __be32
1da177e4 LT	211	nlm4svc_proc_granted(struct svc_rqst rqstp, struct nlm_args argp,
	212	struct nlm_res *resp)
	213	{
	214	resp->cookie = argp->cookie;
	215
	216	dprintk("lockd: GRANTED called\n");
dcff09f1	217	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
1da177e4 LT	218	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	219	return rpc_success;
	220	}
	221
d4716624 TM	222	/*
	223	* This is the generic lockd callback for async RPC calls
	224	*/
	225	static void nlm4svc_callback_exit(struct rpc_task task, void data)
	226	{
c041b5ff	227	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	228	-task->tk_status);
	229	}
	230
	231	static void nlm4svc_callback_release(void *data)
	232	{
7db836d4	233	nlmsvc_release_call(data);
d4716624 TM	234	}
	235
	236	static const struct rpc_call_ops nlm4svc_callback_ops = {
	237	.rpc_call_done = nlm4svc_callback_exit,
	238	.rpc_release = nlm4svc_callback_release,
	239	};
	240
1da177e4 LT	241	/*
	242	* `Async' versions of the above service routines. They aren't really,
	243	* because we send the callback before the reply proper. I hope this
	244	* doesn't break any clients.
	245	*/
7111c66e AV	246	static __be32 nlm4svc_callback(struct svc_rqst rqstp, u32 proc, struct nlm_args argp,
7111c66e AV	247	__be32 (func)(struct svc_rqst , struct nlm_args , struct nlm_res ))
1da177e4	248	{
d4716624 TM	249	struct nlm_host *host;
d4716624 TM	250	struct nlm_rqst *call;
7111c66e	251	__be32 stat;
1da177e4	252
db4e4c9a OK	253	host = nlmsvc_lookup_host(rqstp,
	254	argp->lock.caller,
	255	argp->lock.len);
d4716624 TM	256	if (host == NULL)
	257	return rpc_system_err;
	258
	259	call = nlm_alloc_call(host);
446945ab	260	nlmsvc_release_host(host);
d4716624 TM	261	if (call == NULL)
	262	return rpc_system_err;
	263
	264	stat = func(rqstp, argp, &call->a_res);
	265	if (stat != 0) {
7db836d4	266	nlmsvc_release_call(call);
d4716624 TM	267	return stat;
d4716624 TM	268	}
1da177e4	269
d4716624 TM	270	call->a_flags = RPC_TASK_ASYNC;
	271	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
	272	return rpc_system_err;
	273	return rpc_success;
1da177e4 LT	274	}
1da177e4 LT	275
7111c66e	276	static __be32 nlm4svc_proc_test_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	277	void *resp)
1da177e4 LT	278	{
d4716624 TM	279	dprintk("lockd: TEST_MSG called\n");
	280	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
	281	}
1da177e4	282
7111c66e	283	static __be32 nlm4svc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
d4716624 TM	284	void *resp)
d4716624 TM	285	{
1da177e4	286	dprintk("lockd: LOCK_MSG called\n");
d4716624	287	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
1da177e4 LT	288	}
1da177e4 LT	289
7111c66e	290	static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	291	void *resp)
1da177e4 LT	292	{
1da177e4	293	dprintk("lockd: CANCEL_MSG called\n");
d4716624	294	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
1da177e4 LT	295	}
1da177e4 LT	296
7111c66e	297	static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	298	void *resp)
1da177e4 LT	299	{
1da177e4	300	dprintk("lockd: UNLOCK_MSG called\n");
d4716624	301	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
1da177e4 LT	302	}
1da177e4 LT	303
7111c66e	304	static __be32 nlm4svc_proc_granted_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	305	void *resp)
1da177e4 LT	306	{
1da177e4	307	dprintk("lockd: GRANTED_MSG called\n");
d4716624	308	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
1da177e4 LT	309	}
	310
	311	/*
	312	* SHARE: create a DOS share or alter existing share.
	313	*/
7111c66e	314	static __be32
1da177e4 LT	315	nlm4svc_proc_share(struct svc_rqst rqstp, struct nlm_args argp,
	316	struct nlm_res *resp)
	317	{
	318	struct nlm_host *host;
	319	struct nlm_file *file;
	320
	321	dprintk("lockd: SHARE called\n");
	322
	323	resp->cookie = argp->cookie;
	324
	325	/* Don't accept new lock requests during grace period */
5ccb0066	326	if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
1da177e4 LT	327	resp->status = nlm_lck_denied_grace_period;
	328	return rpc_success;
	329	}
	330
	331	/* Obtain client and file */
	332	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	333	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	334
	335	/* Now try to create the share */
	336	resp->status = nlmsvc_share_file(host, file, argp);
	337
	338	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
67216b94	339	nlmsvc_release_host(host);
1da177e4 LT	340	nlm_release_file(file);
	341	return rpc_success;
	342	}
	343
	344	/*
	345	* UNSHARE: Release a DOS share.
	346	*/
7111c66e	347	static __be32
1da177e4 LT	348	nlm4svc_proc_unshare(struct svc_rqst rqstp, struct nlm_args argp,
	349	struct nlm_res *resp)
	350	{
	351	struct nlm_host *host;
	352	struct nlm_file *file;
	353
	354	dprintk("lockd: UNSHARE called\n");
	355
	356	resp->cookie = argp->cookie;
	357
	358	/* Don't accept requests during grace period */
5ccb0066	359	if (locks_in_grace(SVC_NET(rqstp))) {
1da177e4 LT	360	resp->status = nlm_lck_denied_grace_period;
	361	return rpc_success;
	362	}
	363
	364	/* Obtain client and file */
	365	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	366	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	367
	368	/* Now try to lock the file */
	369	resp->status = nlmsvc_unshare_file(host, file, argp);
	370
	371	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
67216b94	372	nlmsvc_release_host(host);
1da177e4 LT	373	nlm_release_file(file);
	374	return rpc_success;
	375	}
	376
	377	/*
	378	* NM_LOCK: Create an unmonitored lock
	379	*/
7111c66e	380	static __be32
1da177e4 LT	381	nlm4svc_proc_nm_lock(struct svc_rqst rqstp, struct nlm_args argp,
	382	struct nlm_res *resp)
	383	{
	384	dprintk("lockd: NM_LOCK called\n");
	385
	386	argp->monitor = 0; /* just clean the monitor flag */
	387	return nlm4svc_proc_lock(rqstp, argp, resp);
	388	}
	389
	390	/*
	391	* FREE_ALL: Release all locks and shares held by client
	392	*/
7111c66e	393	static __be32
1da177e4 LT	394	nlm4svc_proc_free_all(struct svc_rqst rqstp, struct nlm_args argp,
	395	void *resp)
	396	{
	397	struct nlm_host *host;
	398
	399	/* Obtain client */
	400	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
	401	return rpc_success;
	402
	403	nlmsvc_free_host_resources(host);
67216b94	404	nlmsvc_release_host(host);
1da177e4 LT	405	return rpc_success;
	406	}
	407
	408	/*
	409	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	410	*/
7111c66e	411	static __be32
1da177e4 LT	412	nlm4svc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
	413	void *resp)
	414	{
1da177e4	415	dprintk("lockd: SM_NOTIFY called\n");
b85e4676 CL	416
b85e4676 CL	417	if (!nlm_privileged_requester(rqstp)) {
ad06e4bd CL	418	char buf[RPC_MAX_ADDRBUFLEN];
	419	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	420	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	421	return rpc_system_err;
	422	}
	423
0ad95472	424	nlm_host_rebooted(SVC_NET(rqstp), argp);
1da177e4 LT	425	return rpc_success;
	426	}
	427
	428	/*
	429	* client sent a GRANTED_RES, let's remove the associated block
	430	*/
7111c66e	431	static __be32
1da177e4 LT	432	nlm4svc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
	433	void *resp)
	434	{
	435	if (!nlmsvc_ops)
	436	return rpc_success;
	437
	438	dprintk("lockd: GRANTED_RES called\n");
	439
39be4502	440	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	441	return rpc_success;
	442	}
	443
	444
1da177e4 LT	445	/*
	446	* NLM Server procedures.
	447	*/
	448
	449	#define nlm4svc_encode_norep nlm4svc_encode_void
	450	#define nlm4svc_decode_norep nlm4svc_decode_void
	451	#define nlm4svc_decode_testres nlm4svc_decode_void
	452	#define nlm4svc_decode_lockres nlm4svc_decode_void
	453	#define nlm4svc_decode_unlockres nlm4svc_decode_void
	454	#define nlm4svc_decode_cancelres nlm4svc_decode_void
	455	#define nlm4svc_decode_grantedres nlm4svc_decode_void
	456
	457	#define nlm4svc_proc_none nlm4svc_proc_null
	458	#define nlm4svc_proc_test_res nlm4svc_proc_null
	459	#define nlm4svc_proc_lock_res nlm4svc_proc_null
	460	#define nlm4svc_proc_cancel_res nlm4svc_proc_null
	461	#define nlm4svc_proc_unlock_res nlm4svc_proc_null
	462
	463	struct nlm_void { int dummy; };
	464
	465	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	466	{ .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
	467	.pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
	468	.pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
	469	.pc_release = NULL, \
	470	.pc_argsize = sizeof(struct nlm_##argt), \
	471	.pc_ressize = sizeof(struct nlm_##rest), \
	472	.pc_xdrressize = respsize, \
	473	}
	474	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	475	#define No (1+1024/4) /* netobj */
	476	#define St 1 /* status */
	477	#define Rg 4 /* range (offset + length) */
	478	struct svc_procedure nlmsvc_procedures4[] = {
	479	PROC(null, void, void, void, void, 1),
	480	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	481	PROC(lock, lockargs, res, args, res, Ck+St),
	482	PROC(cancel, cancargs, res, args, res, Ck+St),
	483	PROC(unlock, unlockargs, res, args, res, Ck+St),
	484	PROC(granted, testargs, res, args, res, Ck+St),
	485	PROC(test_msg, testargs, norep, args, void, 1),
	486	PROC(lock_msg, lockargs, norep, args, void, 1),
	487	PROC(cancel_msg, cancargs, norep, args, void, 1),
	488	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	489	PROC(granted_msg, testargs, norep, args, void, 1),
	490	PROC(test_res, testres, norep, res, void, 1),
	491	PROC(lock_res, lockres, norep, res, void, 1),
	492	PROC(cancel_res, cancelres, norep, res, void, 1),
	493	PROC(unlock_res, unlockres, norep, res, void, 1),
	494	PROC(granted_res, res, norep, res, void, 1),
	495	/* statd callback */
	496	PROC(sm_notify, reboot, void, reboot, void, 1),
	497	PROC(none, void, void, void, void, 0),
	498	PROC(none, void, void, void, void, 0),
	499	PROC(none, void, void, void, void, 0),
	500	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	501	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	502	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	503	PROC(free_all, notify, void, args, void, 1),
	504
	505	};