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

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

#include <linux/types.h>
#include <linux/time.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/in.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfsd/nfsd.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/share.h>

#define NLMDBG_FACILITY		NLMDBG_CLIENT

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

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

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

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

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

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

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

	return 0;

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

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

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

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

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

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

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

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

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

	resp->cookie = argp->cookie;

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

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

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

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

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

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

	resp->cookie = argp->cookie;

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

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

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

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

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

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

	resp->cookie = argp->cookie;

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

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

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

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

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

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

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

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

static const struct rpc_call_ops nlmsvc_callback_ops = {
	.rpc_call_done = nlmsvc_callback_exit,
	.rpc_release = nlmsvc_callback_release,
};

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

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

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

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

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

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

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

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

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

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

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

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

	resp->cookie = argp->cookie;

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

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

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

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

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

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

	resp->cookie = argp->cookie;

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

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

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

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

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

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

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

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

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

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

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

	nlm_host_rebooted(argp);
	return rpc_success;
}

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

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

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

/*
 * NLM Server procedures.
 */

#define nlmsvc_encode_norep	nlmsvc_encode_void
#define nlmsvc_decode_norep	nlmsvc_decode_void
#define nlmsvc_decode_testres	nlmsvc_decode_void
#define nlmsvc_decode_lockres	nlmsvc_decode_void
#define nlmsvc_decode_unlockres	nlmsvc_decode_void
#define nlmsvc_decode_cancelres	nlmsvc_decode_void
#define nlmsvc_decode_grantedres	nlmsvc_decode_void

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

struct nlm_void			{ int dummy; };

#define PROC(name, xargt, xrest, argt, rest, respsize)	\
 { .pc_func	= (svc_procfunc) nlmsvc_proc_##name,	\
   .pc_decode	= (kxdrproc_t) nlmsvc_decode_##xargt,	\
   .pc_encode	= (kxdrproc_t) nlmsvc_encode_##xrest,	\
   .pc_release	= NULL,					\
   .pc_argsize	= sizeof(struct nlm_##argt),		\
   .pc_ressize	= sizeof(struct nlm_##rest),		\
   .pc_xdrressize = respsize,				\
 }

#define	Ck	(1+XDR_QUADLEN(NLM_MAXCOOKIELEN))	/* cookie */
#define	St	1				/* status */
#define	No	(1+1024/4)			/* Net Obj */
#define	Rg	2				/* range - offset + size */

struct svc_procedure		nlmsvc_procedures[] = {
  PROC(null,		void,		void,		void,	void, 1),
  PROC(test,		testargs,	testres,	args,	res, Ck+St+2+No+Rg),
  PROC(lock,		lockargs,	res,		args,	res, Ck+St),
  PROC(cancel,		cancargs,	res,		args,	res, Ck+St),
  PROC(unlock,		unlockargs,	res,		args,	res, Ck+St),
  PROC(granted,		testargs,	res,		args,	res, Ck+St),
  PROC(test_msg,	testargs,	norep,		args,	void, 1),
  PROC(lock_msg,	lockargs,	norep,		args,	void, 1),
  PROC(cancel_msg,	cancargs,	norep,		args,	void, 1),
  PROC(unlock_msg,	unlockargs,	norep,		args,	void, 1),
  PROC(granted_msg,	testargs,	norep,		args,	void, 1),
  PROC(test_res,	testres,	norep,		res,	void, 1),
  PROC(lock_res,	lockres,	norep,		res,	void, 1),
  PROC(cancel_res,	cancelres,	norep,		res,	void, 1),
  PROC(unlock_res,	unlockres,	norep,		res,	void, 1),
  PROC(granted_res,	res,		norep,		res,	void, 1),
  /* statd callback */
  PROC(sm_notify,	reboot,		void,		reboot,	void, 1),
  PROC(none,		void,		void,		void,	void, 1),
  PROC(none,		void,		void,		void,	void, 1),
  PROC(none,		void,		void,		void,	void, 1),
  PROC(share,		shareargs,	shareres,	args,	res, Ck+St+1),
  PROC(unshare,		shareargs,	shareres,	args,	res, Ck+St+1),
  PROC(nm_lock,		lockargs,	res,		args,	res, Ck+St),
  PROC(free_all,	notify,		void,		args,	void, 0),

};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/lockd/svcproc.c
	3	*
	4	* Lockd server procedures. We don't implement the NLM_*_RES
	5	* procedures because we don't use the async procedures.
	6	*
	7	* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
	8	*/
	9
1da177e4 LT	10	#include <linux/types.h>
	11	#include <linux/time.h>
	12	#include <linux/slab.h>
405f5571	13	#include <linux/smp_lock.h>
1da177e4 LT	14	#include <linux/in.h>
	15	#include <linux/sunrpc/svc.h>
	16	#include <linux/sunrpc/clnt.h>
	17	#include <linux/nfsd/nfsd.h>
	18	#include <linux/lockd/lockd.h>
	19	#include <linux/lockd/share.h>
1da177e4 LT	20
	21	#define NLMDBG_FACILITY NLMDBG_CLIENT
	22
1da177e4	23	#ifdef CONFIG_LOCKD_V4
52921e02 AV	24	static __be32
52921e02 AV	25	cast_to_nlm(__be32 status, u32 vers)
1da177e4 LT	26	{
	27	/* Note: status is assumed to be in network byte order !!! */
	28	if (vers != 4){
	29	switch (status) {
	30	case nlm_granted:
	31	case nlm_lck_denied:
	32	case nlm_lck_denied_nolocks:
	33	case nlm_lck_blocked:
	34	case nlm_lck_denied_grace_period:
5ea0d750	35	case nlm_drop_reply:
1da177e4 LT	36	break;
	37	case nlm4_deadlock:
	38	status = nlm_lck_denied;
	39	break;
	40	default:
	41	status = nlm_lck_denied_nolocks;
	42	}
	43	}
	44
	45	return (status);
	46	}
	47	#define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
	48	#else
	49	#define cast_status(status) (status)
	50	#endif
	51
	52	/*
	53	* Obtain client and file from arguments
	54	*/
52921e02	55	static __be32
1da177e4 LT	56	nlmsvc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	57	struct nlm_host hostp, struct nlm_file filp)
	58	{
	59	struct nlm_host *host = NULL;
	60	struct nlm_file *file = NULL;
	61	struct nlm_lock *lock = &argp->lock;
52921e02	62	__be32 error = 0;
1da177e4 LT	63
	64	/* nfsd callbacks must have been installed for this procedure */
	65	if (!nlmsvc_ops)
	66	return nlm_lck_denied_nolocks;
	67
	68	/* Obtain host handle */
db4e4c9a	69	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
977faf39	70	\|\| (argp->monitor && nsm_monitor(host) < 0))
1da177e4 LT	71	goto no_locks;
	72	*hostp = host;
	73
	74	/* Obtain file pointer. Not used by FREE_ALL call. */
	75	if (filp != NULL) {
	76	if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
	77	goto no_locks;
	78	*filp = file;
	79
	80	/* Set up the missing parts of the file_lock structure */
	81	lock->fl.fl_file = file->f_file;
	82	lock->fl.fl_owner = (fl_owner_t) host;
	83	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	84	}
	85
	86	return 0;
	87
	88	no_locks:
b0e92aae	89	nlm_release_host(host);
d343fce1 N	90	if (error)
d343fce1 N	91	return error;
1da177e4 LT	92	return nlm_lck_denied_nolocks;
	93	}
	94
	95	/*
	96	* NULL: Test for presence of service
	97	*/
7111c66e	98	static __be32
1da177e4 LT	99	nlmsvc_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	100	{
	101	dprintk("lockd: NULL called\n");
	102	return rpc_success;
	103	}
	104
	105	/*
	106	* TEST: Check for conflicting lock
	107	*/
7111c66e	108	static __be32
1da177e4 LT	109	nlmsvc_proc_test(struct svc_rqst rqstp, struct nlm_args argp,
	110	struct nlm_res *resp)
	111	{
	112	struct nlm_host *host;
	113	struct nlm_file *file;
317602f3	114	__be32 rc = rpc_success;
1da177e4 LT	115
	116	dprintk("lockd: TEST called\n");
	117	resp->cookie = argp->cookie;
	118
1da177e4 LT	119	/* Obtain client and file */
1da177e4 LT	120	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	121	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	122
1da177e4 LT	123	/* Now check for conflicting locks */
8f920d5e	124	resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie));
5ea0d750	125	if (resp->status == nlm_drop_reply)
b7e6b869 OD	126	rc = rpc_drop_reply;
	127	else
	128	dprintk("lockd: TEST status %d vers %d\n",
	129	ntohl(resp->status), rqstp->rq_vers);
1da177e4	130
1da177e4 LT	131	nlm_release_host(host);
1da177e4 LT	132	nlm_release_file(file);
b7e6b869	133	return rc;
1da177e4 LT	134	}
1da177e4 LT	135
7111c66e	136	static __be32
1da177e4 LT	137	nlmsvc_proc_lock(struct svc_rqst rqstp, struct nlm_args argp,
	138	struct nlm_res *resp)
	139	{
	140	struct nlm_host *host;
	141	struct nlm_file *file;
317602f3	142	__be32 rc = rpc_success;
1da177e4 LT	143
	144	dprintk("lockd: LOCK called\n");
	145
	146	resp->cookie = argp->cookie;
	147
1da177e4 LT	148	/* Obtain client and file */
1da177e4 LT	149	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	150	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	151
	152	#if 0
	153	/* If supplied state doesn't match current state, we assume it's
	154	* an old request that time-warped somehow. Any error return would
	155	* do in this case because it's irrelevant anyway.
	156	*
	157	* NB: We don't retrieve the remote host's state yet.
	158	*/
	159	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	160	resp->status = nlm_lck_denied_nolocks;
	161	} else
	162	#endif
	163
	164	/* Now try to lock the file */
6cde4de8	165	resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock,
b2b50289 BF	166	argp->block, &argp->cookie,
b2b50289 BF	167	argp->reclaim));
1a8322b2	168	if (resp->status == nlm_drop_reply)
b7e6b869 OD	169	rc = rpc_drop_reply;
	170	else
	171	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
1da177e4	172
1da177e4 LT	173	nlm_release_host(host);
1da177e4 LT	174	nlm_release_file(file);
b7e6b869	175	return rc;
1da177e4 LT	176	}
1da177e4 LT	177
7111c66e	178	static __be32
1da177e4 LT	179	nlmsvc_proc_cancel(struct svc_rqst rqstp, struct nlm_args argp,
	180	struct nlm_res *resp)
	181	{
	182	struct nlm_host *host;
	183	struct nlm_file *file;
	184
	185	dprintk("lockd: CANCEL called\n");
	186
	187	resp->cookie = argp->cookie;
	188
	189	/* Don't accept requests during grace period */
af558e33	190	if (locks_in_grace()) {
1da177e4 LT	191	resp->status = nlm_lck_denied_grace_period;
	192	return rpc_success;
	193	}
	194
	195	/* Obtain client and file */
	196	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	197	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	198
	199	/* Try to cancel request. */
	200	resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock));
	201
	202	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
	203	nlm_release_host(host);
	204	nlm_release_file(file);
	205	return rpc_success;
	206	}
	207
	208	/*
	209	* UNLOCK: release a lock
	210	*/
7111c66e	211	static __be32
1da177e4 LT	212	nlmsvc_proc_unlock(struct svc_rqst rqstp, struct nlm_args argp,
	213	struct nlm_res *resp)
	214	{
	215	struct nlm_host *host;
	216	struct nlm_file *file;
	217
	218	dprintk("lockd: UNLOCK called\n");
	219
	220	resp->cookie = argp->cookie;
	221
	222	/* Don't accept new lock requests during grace period */
af558e33	223	if (locks_in_grace()) {
1da177e4 LT	224	resp->status = nlm_lck_denied_grace_period;
	225	return rpc_success;
	226	}
	227
	228	/* Obtain client and file */
	229	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	230	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	231
	232	/* Now try to remove the lock */
	233	resp->status = cast_status(nlmsvc_unlock(file, &argp->lock));
	234
	235	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
	236	nlm_release_host(host);
	237	nlm_release_file(file);
	238	return rpc_success;
	239	}
	240
	241	/*
	242	* GRANTED: A server calls us to tell that a process' lock request
	243	* was granted
	244	*/
7111c66e	245	static __be32
1da177e4 LT	246	nlmsvc_proc_granted(struct svc_rqst rqstp, struct nlm_args argp,
	247	struct nlm_res *resp)
	248	{
	249	resp->cookie = argp->cookie;
	250
	251	dprintk("lockd: GRANTED called\n");
dcff09f1	252	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
1da177e4 LT	253	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	254	return rpc_success;
	255	}
	256
d4716624 TM	257	/*
	258	* This is the generic lockd callback for async RPC calls
	259	*/
	260	static void nlmsvc_callback_exit(struct rpc_task task, void data)
	261	{
c041b5ff	262	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	263	-task->tk_status);
	264	}
	265
	266	static void nlmsvc_callback_release(void *data)
	267	{
a86dc496	268	lock_kernel();
d4716624	269	nlm_release_call(data);
a86dc496	270	unlock_kernel();
d4716624 TM	271	}
	272
	273	static const struct rpc_call_ops nlmsvc_callback_ops = {
	274	.rpc_call_done = nlmsvc_callback_exit,
	275	.rpc_release = nlmsvc_callback_release,
	276	};
	277
1da177e4 LT	278	/*
	279	* `Async' versions of the above service routines. They aren't really,
	280	* because we send the callback before the reply proper. I hope this
	281	* doesn't break any clients.
	282	*/
7111c66e AV	283	static __be32 nlmsvc_callback(struct svc_rqst rqstp, u32 proc, struct nlm_args argp,
7111c66e AV	284	__be32 (func)(struct svc_rqst , struct nlm_args , struct nlm_res ))
1da177e4	285	{
d4716624 TM	286	struct nlm_host *host;
d4716624 TM	287	struct nlm_rqst *call;
7111c66e	288	__be32 stat;
1da177e4	289
db4e4c9a OK	290	host = nlmsvc_lookup_host(rqstp,
	291	argp->lock.caller,
	292	argp->lock.len);
d4716624 TM	293	if (host == NULL)
	294	return rpc_system_err;
	295
	296	call = nlm_alloc_call(host);
	297	if (call == NULL)
	298	return rpc_system_err;
	299
	300	stat = func(rqstp, argp, &call->a_res);
	301	if (stat != 0) {
	302	nlm_release_call(call);
	303	return stat;
	304	}
1da177e4	305
d4716624 TM	306	call->a_flags = RPC_TASK_ASYNC;
	307	if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
	308	return rpc_system_err;
	309	return rpc_success;
1da177e4 LT	310	}
1da177e4 LT	311
7111c66e	312	static __be32 nlmsvc_proc_test_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	313	void *resp)
1da177e4 LT	314	{
d4716624 TM	315	dprintk("lockd: TEST_MSG called\n");
	316	return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test);
	317	}
1da177e4	318
7111c66e	319	static __be32 nlmsvc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
d4716624 TM	320	void *resp)
d4716624 TM	321	{
1da177e4	322	dprintk("lockd: LOCK_MSG called\n");
d4716624	323	return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock);
1da177e4 LT	324	}
1da177e4 LT	325
7111c66e	326	static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	327	void *resp)
1da177e4 LT	328	{
1da177e4	329	dprintk("lockd: CANCEL_MSG called\n");
d4716624	330	return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel);
1da177e4 LT	331	}
1da177e4 LT	332
7111c66e	333	static __be32
1da177e4 LT	334	nlmsvc_proc_unlock_msg(struct svc_rqst rqstp, struct nlm_args argp,
	335	void *resp)
	336	{
1da177e4	337	dprintk("lockd: UNLOCK_MSG called\n");
d4716624	338	return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock);
1da177e4 LT	339	}
1da177e4 LT	340
7111c66e	341	static __be32
1da177e4 LT	342	nlmsvc_proc_granted_msg(struct svc_rqst rqstp, struct nlm_args argp,
	343	void *resp)
	344	{
1da177e4	345	dprintk("lockd: GRANTED_MSG called\n");
d4716624	346	return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted);
1da177e4 LT	347	}
	348
	349	/*
	350	* SHARE: create a DOS share or alter existing share.
	351	*/
7111c66e	352	static __be32
1da177e4 LT	353	nlmsvc_proc_share(struct svc_rqst rqstp, struct nlm_args argp,
	354	struct nlm_res *resp)
	355	{
	356	struct nlm_host *host;
	357	struct nlm_file *file;
	358
	359	dprintk("lockd: SHARE called\n");
	360
	361	resp->cookie = argp->cookie;
	362
	363	/* Don't accept new lock requests during grace period */
af558e33	364	if (locks_in_grace() && !argp->reclaim) {
1da177e4 LT	365	resp->status = nlm_lck_denied_grace_period;
	366	return rpc_success;
	367	}
	368
	369	/* Obtain client and file */
	370	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	371	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	372
	373	/* Now try to create the share */
	374	resp->status = cast_status(nlmsvc_share_file(host, file, argp));
	375
	376	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
	377	nlm_release_host(host);
	378	nlm_release_file(file);
	379	return rpc_success;
	380	}
	381
	382	/*
	383	* UNSHARE: Release a DOS share.
	384	*/
7111c66e	385	static __be32
1da177e4 LT	386	nlmsvc_proc_unshare(struct svc_rqst rqstp, struct nlm_args argp,
	387	struct nlm_res *resp)
	388	{
	389	struct nlm_host *host;
	390	struct nlm_file *file;
	391
	392	dprintk("lockd: UNSHARE called\n");
	393
	394	resp->cookie = argp->cookie;
	395
	396	/* Don't accept requests during grace period */
af558e33	397	if (locks_in_grace()) {
1da177e4 LT	398	resp->status = nlm_lck_denied_grace_period;
	399	return rpc_success;
	400	}
	401
	402	/* Obtain client and file */
	403	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	404	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	405
	406	/* Now try to unshare the file */
	407	resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
	408
	409	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
	410	nlm_release_host(host);
	411	nlm_release_file(file);
	412	return rpc_success;
	413	}
	414
	415	/*
	416	* NM_LOCK: Create an unmonitored lock
	417	*/
7111c66e	418	static __be32
1da177e4 LT	419	nlmsvc_proc_nm_lock(struct svc_rqst rqstp, struct nlm_args argp,
	420	struct nlm_res *resp)
	421	{
	422	dprintk("lockd: NM_LOCK called\n");
	423
	424	argp->monitor = 0; /* just clean the monitor flag */
	425	return nlmsvc_proc_lock(rqstp, argp, resp);
	426	}
	427
	428	/*
	429	* FREE_ALL: Release all locks and shares held by client
	430	*/
7111c66e	431	static __be32
1da177e4 LT	432	nlmsvc_proc_free_all(struct svc_rqst rqstp, struct nlm_args argp,
	433	void *resp)
	434	{
	435	struct nlm_host *host;
	436
	437	/* Obtain client */
	438	if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
	439	return rpc_success;
	440
	441	nlmsvc_free_host_resources(host);
	442	nlm_release_host(host);
	443	return rpc_success;
	444	}
	445
	446	/*
	447	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	448	*/
7111c66e	449	static __be32
1da177e4 LT	450	nlmsvc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
	451	void *resp)
	452	{
1da177e4	453	dprintk("lockd: SM_NOTIFY called\n");
b85e4676 CL	454
b85e4676 CL	455	if (!nlm_privileged_requester(rqstp)) {
ad06e4bd CL	456	char buf[RPC_MAX_ADDRBUFLEN];
	457	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	458	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	459	return rpc_system_err;
	460	}
	461
7fefc9cb	462	nlm_host_rebooted(argp);
1da177e4 LT	463	return rpc_success;
	464	}
	465
	466	/*
	467	* client sent a GRANTED_RES, let's remove the associated block
	468	*/
7111c66e	469	static __be32
1da177e4 LT	470	nlmsvc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
	471	void *resp)
	472	{
	473	if (!nlmsvc_ops)
	474	return rpc_success;
	475
	476	dprintk("lockd: GRANTED_RES called\n");
	477
39be4502	478	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	479	return rpc_success;
	480	}
	481
1da177e4 LT	482	/*
	483	* NLM Server procedures.
	484	*/
	485
	486	#define nlmsvc_encode_norep nlmsvc_encode_void
	487	#define nlmsvc_decode_norep nlmsvc_decode_void
	488	#define nlmsvc_decode_testres nlmsvc_decode_void
	489	#define nlmsvc_decode_lockres nlmsvc_decode_void
	490	#define nlmsvc_decode_unlockres nlmsvc_decode_void
	491	#define nlmsvc_decode_cancelres nlmsvc_decode_void
	492	#define nlmsvc_decode_grantedres nlmsvc_decode_void
	493
	494	#define nlmsvc_proc_none nlmsvc_proc_null
	495	#define nlmsvc_proc_test_res nlmsvc_proc_null
	496	#define nlmsvc_proc_lock_res nlmsvc_proc_null
	497	#define nlmsvc_proc_cancel_res nlmsvc_proc_null
	498	#define nlmsvc_proc_unlock_res nlmsvc_proc_null
	499
	500	struct nlm_void { int dummy; };
	501
	502	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	503	{ .pc_func = (svc_procfunc) nlmsvc_proc_##name, \
	504	.pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \
	505	.pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \
	506	.pc_release = NULL, \
	507	.pc_argsize = sizeof(struct nlm_##argt), \
	508	.pc_ressize = sizeof(struct nlm_##rest), \
	509	.pc_xdrressize = respsize, \
	510	}
	511
	512	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	513	#define St 1 /* status */
	514	#define No (1+1024/4) /* Net Obj */
	515	#define Rg 2 /* range - offset + size */
	516
	517	struct svc_procedure nlmsvc_procedures[] = {
	518	PROC(null, void, void, void, void, 1),
	519	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	520	PROC(lock, lockargs, res, args, res, Ck+St),
	521	PROC(cancel, cancargs, res, args, res, Ck+St),
	522	PROC(unlock, unlockargs, res, args, res, Ck+St),
	523	PROC(granted, testargs, res, args, res, Ck+St),
	524	PROC(test_msg, testargs, norep, args, void, 1),
	525	PROC(lock_msg, lockargs, norep, args, void, 1),
	526	PROC(cancel_msg, cancargs, norep, args, void, 1),
	527	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	528	PROC(granted_msg, testargs, norep, args, void, 1),
	529	PROC(test_res, testres, norep, res, void, 1),
	530	PROC(lock_res, lockres, norep, res, void, 1),
	531	PROC(cancel_res, cancelres, norep, res, void, 1),
	532	PROC(unlock_res, unlockres, norep, res, void, 1),
	533	PROC(granted_res, res, norep, res, void, 1),
	534	/* statd callback */
	535	PROC(sm_notify, reboot, void, reboot, void, 1),
	536	PROC(none, void, void, void, void, 1),
	537	PROC(none, void, void, void, void, 1),
	538	PROC(none, void, void, void, void, 1),
	539	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	540	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	541	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	542	PROC(free_all, notify, void, args, void, 0),
	543
	544	};