[mirror_ubuntu-artful-kernel.git] / fs / lockd / svcproc.c

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

#include <linux/types.h>
#include <linux/time.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/share.h>
#include <linux/sunrpc/svc_xprt.h>

#define NLMDBG_FACILITY		NLMDBG_CLIENT

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

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

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

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

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

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

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

	return 0;

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

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

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

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

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

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

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

static __be32
nlmsvc_proc_test(struct svc_rqst *rqstp)
{
	return __nlmsvc_proc_test(rqstp, rqstp->rq_resp);
}

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

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

	resp->cookie = argp->cookie;

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

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

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

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

static __be32
nlmsvc_proc_lock(struct svc_rqst *rqstp)
{
	return __nlmsvc_proc_lock(rqstp, rqstp->rq_resp);
}

static __be32
__nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_res *resp)
{
	struct nlm_args *argp = rqstp->rq_argp;
	struct nlm_host	*host;
	struct nlm_file	*file;
	struct net *net = SVC_NET(rqstp);

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

	resp->cookie = argp->cookie;

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

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

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

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

static __be32
nlmsvc_proc_cancel(struct svc_rqst *rqstp)
{
	return __nlmsvc_proc_cancel(rqstp, rqstp->rq_resp);
}

/*
 * UNLOCK: release a lock
 */
static __be32
__nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_res *resp)
{
	struct nlm_args *argp = rqstp->rq_argp;
	struct nlm_host	*host;
	struct nlm_file	*file;
	struct net *net = SVC_NET(rqstp);

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

	resp->cookie = argp->cookie;

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

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

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

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

static __be32
nlmsvc_proc_unlock(struct svc_rqst *rqstp)
{
	return __nlmsvc_proc_unlock(rqstp, rqstp->rq_resp);
}

/*
 * 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_res *resp)
{
	struct nlm_args *argp = rqstp->rq_argp;

	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;
}

static __be32
nlmsvc_proc_granted(struct svc_rqst *rqstp)
{
	return __nlmsvc_proc_granted(rqstp, rqstp->rq_resp);
}

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

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

static void nlmsvc_callback_release(void *data)
{
	nlmsvc_release_call(data);
}

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

/*
 * `Async' versions of the above service routines. They aren't really,
 * because we send the callback before the reply proper. I hope this
 * doesn't break any clients.
 */
static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc,
		__be32 (*func)(struct svc_rqst *, struct nlm_res *))
{
	struct nlm_args *argp = rqstp->rq_argp;
	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, &call->a_res);
	if (stat != 0) {
		nlmsvc_release_call(call);
		return stat;
	}

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

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

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

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

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

static __be32
nlmsvc_proc_granted_msg(struct svc_rqst *rqstp)
{
	dprintk("lockd: GRANTED_MSG   called\n");
	return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, __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 = rqstp->rq_argp;
	struct nlm_res *resp = rqstp->rq_resp;
	struct nlm_host	*host;
	struct nlm_file	*file;

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

	resp->cookie = argp->cookie;

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

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

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

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

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

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

	resp->cookie = argp->cookie;

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

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

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

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

/*
 * NM_LOCK: Create an unmonitored lock
 */
static __be32
nlmsvc_proc_nm_lock(struct svc_rqst *rqstp)
{
	struct nlm_args *argp = rqstp->rq_argp;

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

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

/*
 * FREE_ALL: Release all locks and shares held by client
 */
static __be32
nlmsvc_proc_free_all(struct svc_rqst *rqstp)
{
	struct nlm_args *argp = rqstp->rq_argp;
	struct nlm_host	*host;

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

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

/*
 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
 */
static __be32
nlmsvc_proc_sm_notify(struct svc_rqst *rqstp)
{
	struct nlm_reboot *argp = rqstp->rq_argp;

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

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

	nlm_host_rebooted(SVC_NET(rqstp), argp);
	return rpc_success;
}

/*
 * client sent a GRANTED_RES, let's remove the associated block
 */
static __be32
nlmsvc_proc_granted_res(struct svc_rqst *rqstp)
{
	struct nlm_res *argp = rqstp->rq_argp;

	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	= nlmsvc_proc_##name,			\
   .pc_decode	= nlmsvc_decode_##xargt,		\
   .pc_encode	= 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 */

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

};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/lockd/svcproc.c
	3	*
	4	* Lockd server procedures. We don't implement the NLM_*_RES
	5	* procedures because we don't use the async procedures.
	6	*
	7	* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
	8	*/
	9
1da177e4 LT	10	#include <linux/types.h>
1da177e4 LT	11	#include <linux/time.h>
1da177e4 LT	12	#include <linux/lockd/lockd.h>
1da177e4 LT	13	#include <linux/lockd/share.h>
5ccb0066	14	#include <linux/sunrpc/svc_xprt.h>
1da177e4 LT	15
	16	#define NLMDBG_FACILITY NLMDBG_CLIENT
	17
1da177e4	18	#ifdef CONFIG_LOCKD_V4
52921e02 AV	19	static __be32
52921e02 AV	20	cast_to_nlm(__be32 status, u32 vers)
1da177e4 LT	21	{
	22	/* Note: status is assumed to be in network byte order !!! */
	23	if (vers != 4){
	24	switch (status) {
	25	case nlm_granted:
	26	case nlm_lck_denied:
	27	case nlm_lck_denied_nolocks:
	28	case nlm_lck_blocked:
	29	case nlm_lck_denied_grace_period:
5ea0d750	30	case nlm_drop_reply:
1da177e4 LT	31	break;
	32	case nlm4_deadlock:
	33	status = nlm_lck_denied;
	34	break;
	35	default:
	36	status = nlm_lck_denied_nolocks;
	37	}
	38	}
	39
	40	return (status);
	41	}
	42	#define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
	43	#else
	44	#define cast_status(status) (status)
	45	#endif
	46
	47	/*
	48	* Obtain client and file from arguments
	49	*/
52921e02	50	static __be32
1da177e4 LT	51	nlmsvc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	52	struct nlm_host hostp, struct nlm_file filp)
	53	{
	54	struct nlm_host *host = NULL;
	55	struct nlm_file *file = NULL;
	56	struct nlm_lock *lock = &argp->lock;
52921e02	57	__be32 error = 0;
1da177e4 LT	58
	59	/* nfsd callbacks must have been installed for this procedure */
	60	if (!nlmsvc_ops)
	61	return nlm_lck_denied_nolocks;
	62
	63	/* Obtain host handle */
db4e4c9a	64	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
977faf39	65	\|\| (argp->monitor && nsm_monitor(host) < 0))
1da177e4 LT	66	goto no_locks;
	67	*hostp = host;
	68
	69	/* Obtain file pointer. Not used by FREE_ALL call. */
	70	if (filp != NULL) {
cd0b16c1 TM	71	error = cast_status(nlm_lookup_file(rqstp, &file, &lock->fh));
cd0b16c1 TM	72	if (error != 0)
1da177e4 LT	73	goto no_locks;
	74	*filp = file;
	75
	76	/* Set up the missing parts of the file_lock structure */
	77	lock->fl.fl_file = file->f_file;
	78	lock->fl.fl_owner = (fl_owner_t) host;
	79	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	80	}
	81
	82	return 0;
	83
	84	no_locks:
67216b94	85	nlmsvc_release_host(host);
d343fce1 N	86	if (error)
d343fce1 N	87	return error;
1da177e4 LT	88	return nlm_lck_denied_nolocks;
	89	}
	90
	91	/*
	92	* NULL: Test for presence of service
	93	*/
7111c66e	94	static __be32
a6beb732	95	nlmsvc_proc_null(struct svc_rqst *rqstp)
1da177e4 LT	96	{
	97	dprintk("lockd: NULL called\n");
	98	return rpc_success;
	99	}
	100
	101	/*
	102	* TEST: Check for conflicting lock
	103	*/
7111c66e	104	static __be32
a6beb732	105	__nlmsvc_proc_test(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	106	{
a6beb732	107	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	108	struct nlm_host *host;
1da177e4 LT	109	struct nlm_file *file;
317602f3	110	__be32 rc = rpc_success;
1da177e4 LT	111
	112	dprintk("lockd: TEST called\n");
	113	resp->cookie = argp->cookie;
	114
1da177e4 LT	115	/* Obtain client and file */
1da177e4 LT	116	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	117	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	118
1da177e4 LT	119	/* Now check for conflicting locks */
8f920d5e	120	resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie));
5ea0d750	121	if (resp->status == nlm_drop_reply)
b7e6b869 OD	122	rc = rpc_drop_reply;
	123	else
	124	dprintk("lockd: TEST status %d vers %d\n",
	125	ntohl(resp->status), rqstp->rq_vers);
1da177e4	126
67216b94	127	nlmsvc_release_host(host);
1da177e4	128	nlm_release_file(file);
b7e6b869	129	return rc;
1da177e4 LT	130	}
1da177e4 LT	131
7111c66e	132	static __be32
a6beb732	133	nlmsvc_proc_test(struct svc_rqst *rqstp)
1da177e4	134	{
a6beb732 CH	135	return __nlmsvc_proc_test(rqstp, rqstp->rq_resp);
	136	}
	137
	138	static __be32
	139	__nlmsvc_proc_lock(struct svc_rqst rqstp, struct nlm_res resp)
	140	{
	141	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	142	struct nlm_host *host;
1da177e4 LT	143	struct nlm_file *file;
317602f3	144	__be32 rc = rpc_success;
1da177e4 LT	145
	146	dprintk("lockd: LOCK called\n");
	147
	148	resp->cookie = argp->cookie;
	149
1da177e4 LT	150	/* Obtain client and file */
1da177e4 LT	151	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	152	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	153
	154	#if 0
	155	/* If supplied state doesn't match current state, we assume it's
	156	* an old request that time-warped somehow. Any error return would
	157	* do in this case because it's irrelevant anyway.
	158	*
	159	* NB: We don't retrieve the remote host's state yet.
	160	*/
	161	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	162	resp->status = nlm_lck_denied_nolocks;
	163	} else
	164	#endif
	165
	166	/* Now try to lock the file */
6cde4de8	167	resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock,
b2b50289 BF	168	argp->block, &argp->cookie,
b2b50289 BF	169	argp->reclaim));
1a8322b2	170	if (resp->status == nlm_drop_reply)
b7e6b869 OD	171	rc = rpc_drop_reply;
	172	else
	173	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
1da177e4	174
67216b94	175	nlmsvc_release_host(host);
1da177e4	176	nlm_release_file(file);
b7e6b869	177	return rc;
1da177e4 LT	178	}
1da177e4 LT	179
7111c66e	180	static __be32
a6beb732 CH	181	nlmsvc_proc_lock(struct svc_rqst *rqstp)
	182	{
	183	return __nlmsvc_proc_lock(rqstp, rqstp->rq_resp);
	184	}
	185
	186	static __be32
	187	__nlmsvc_proc_cancel(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	188	{
a6beb732	189	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	190	struct nlm_host *host;
1da177e4 LT	191	struct nlm_file *file;
5ccb0066	192	struct net *net = SVC_NET(rqstp);
1da177e4 LT	193
	194	dprintk("lockd: CANCEL called\n");
	195
	196	resp->cookie = argp->cookie;
	197
	198	/* Don't accept requests during grace period */
5ccb0066	199	if (locks_in_grace(net)) {
1da177e4 LT	200	resp->status = nlm_lck_denied_grace_period;
	201	return rpc_success;
	202	}
	203
	204	/* Obtain client and file */
	205	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	206	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	207
1da177e4 LT	208	/* Try to cancel request. */
5ccb0066	209	resp->status = cast_status(nlmsvc_cancel_blocked(net, file, &argp->lock));
1da177e4 LT	210
1da177e4 LT	211	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
67216b94	212	nlmsvc_release_host(host);
1da177e4 LT	213	nlm_release_file(file);
	214	return rpc_success;
	215	}
	216
a6beb732 CH	217	static __be32
	218	nlmsvc_proc_cancel(struct svc_rqst *rqstp)
	219	{
	220	return __nlmsvc_proc_cancel(rqstp, rqstp->rq_resp);
	221	}
	222
1da177e4 LT	223	/*
	224	* UNLOCK: release a lock
	225	*/
7111c66e	226	static __be32
a6beb732	227	__nlmsvc_proc_unlock(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	228	{
a6beb732	229	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	230	struct nlm_host *host;
1da177e4 LT	231	struct nlm_file *file;
5ccb0066	232	struct net *net = SVC_NET(rqstp);
1da177e4 LT	233
	234	dprintk("lockd: UNLOCK called\n");
	235
	236	resp->cookie = argp->cookie;
	237
	238	/* Don't accept new lock requests during grace period */
5ccb0066	239	if (locks_in_grace(net)) {
1da177e4 LT	240	resp->status = nlm_lck_denied_grace_period;
	241	return rpc_success;
	242	}
	243
	244	/* Obtain client and file */
	245	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	246	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	247
1da177e4 LT	248	/* Now try to remove the lock */
5ccb0066	249	resp->status = cast_status(nlmsvc_unlock(net, file, &argp->lock));
1da177e4 LT	250
1da177e4 LT	251	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
67216b94	252	nlmsvc_release_host(host);
1da177e4 LT	253	nlm_release_file(file);
	254	return rpc_success;
	255	}
	256
a6beb732 CH	257	static __be32
	258	nlmsvc_proc_unlock(struct svc_rqst *rqstp)
	259	{
	260	return __nlmsvc_proc_unlock(rqstp, rqstp->rq_resp);
	261	}
	262
1da177e4 LT	263	/*
	264	* GRANTED: A server calls us to tell that a process' lock request
	265	* was granted
	266	*/
7111c66e	267	static __be32
a6beb732	268	__nlmsvc_proc_granted(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	269	{
a6beb732 CH	270	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	271
1da177e4 LT	272	resp->cookie = argp->cookie;
	273
	274	dprintk("lockd: GRANTED called\n");
dcff09f1	275	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
1da177e4 LT	276	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	277	return rpc_success;
	278	}
	279
a6beb732 CH	280	static __be32
	281	nlmsvc_proc_granted(struct svc_rqst *rqstp)
	282	{
	283	return __nlmsvc_proc_granted(rqstp, rqstp->rq_resp);
	284	}
	285
d4716624 TM	286	/*
	287	* This is the generic lockd callback for async RPC calls
	288	*/
	289	static void nlmsvc_callback_exit(struct rpc_task task, void data)
	290	{
c041b5ff	291	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	292	-task->tk_status);
	293	}
	294
7db836d4 CL	295	void nlmsvc_release_call(struct nlm_rqst *call)
	296	{
	297	if (!atomic_dec_and_test(&call->a_count))
	298	return;
67216b94	299	nlmsvc_release_host(call->a_host);
7db836d4 CL	300	kfree(call);
	301	}
	302
d4716624 TM	303	static void nlmsvc_callback_release(void *data)
d4716624 TM	304	{
7db836d4	305	nlmsvc_release_call(data);
d4716624 TM	306	}
	307
	308	static const struct rpc_call_ops nlmsvc_callback_ops = {
	309	.rpc_call_done = nlmsvc_callback_exit,
	310	.rpc_release = nlmsvc_callback_release,
	311	};
	312
1da177e4 LT	313	/*
	314	* `Async' versions of the above service routines. They aren't really,
	315	* because we send the callback before the reply proper. I hope this
	316	* doesn't break any clients.
	317	*/
a6beb732 CH	318	static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc,
a6beb732 CH	319	__be32 (func)(struct svc_rqst , struct nlm_res *))
1da177e4	320	{
a6beb732	321	struct nlm_args *argp = rqstp->rq_argp;
d4716624 TM	322	struct nlm_host *host;
d4716624 TM	323	struct nlm_rqst *call;
7111c66e	324	__be32 stat;
1da177e4	325
db4e4c9a OK	326	host = nlmsvc_lookup_host(rqstp,
	327	argp->lock.caller,
	328	argp->lock.len);
d4716624 TM	329	if (host == NULL)
	330	return rpc_system_err;
	331
	332	call = nlm_alloc_call(host);
446945ab	333	nlmsvc_release_host(host);
d4716624 TM	334	if (call == NULL)
	335	return rpc_system_err;
	336
a6beb732	337	stat = func(rqstp, &call->a_res);
d4716624	338	if (stat != 0) {
7db836d4	339	nlmsvc_release_call(call);
d4716624 TM	340	return stat;
d4716624 TM	341	}
1da177e4	342
d4716624 TM	343	call->a_flags = RPC_TASK_ASYNC;
	344	if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
	345	return rpc_system_err;
	346	return rpc_success;
1da177e4 LT	347	}
1da177e4 LT	348
a6beb732	349	static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp)
1da177e4	350	{
d4716624	351	dprintk("lockd: TEST_MSG called\n");
a6beb732	352	return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, __nlmsvc_proc_test);
d4716624	353	}
1da177e4	354
a6beb732	355	static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp)
d4716624	356	{
1da177e4	357	dprintk("lockd: LOCK_MSG called\n");
a6beb732	358	return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, __nlmsvc_proc_lock);
1da177e4 LT	359	}
1da177e4 LT	360
a6beb732	361	static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp)
1da177e4	362	{
1da177e4	363	dprintk("lockd: CANCEL_MSG called\n");
a6beb732	364	return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, __nlmsvc_proc_cancel);
1da177e4 LT	365	}
1da177e4 LT	366
7111c66e	367	static __be32
a6beb732	368	nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp)
1da177e4	369	{
1da177e4	370	dprintk("lockd: UNLOCK_MSG called\n");
a6beb732	371	return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlmsvc_proc_unlock);
1da177e4 LT	372	}
1da177e4 LT	373
7111c66e	374	static __be32
a6beb732	375	nlmsvc_proc_granted_msg(struct svc_rqst *rqstp)
1da177e4	376	{
1da177e4	377	dprintk("lockd: GRANTED_MSG called\n");
a6beb732	378	return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, __nlmsvc_proc_granted);
1da177e4 LT	379	}
	380
	381	/*
	382	* SHARE: create a DOS share or alter existing share.
	383	*/
7111c66e	384	static __be32
a6beb732	385	nlmsvc_proc_share(struct svc_rqst *rqstp)
1da177e4	386	{
a6beb732 CH	387	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	388	struct nlm_res *resp = rqstp->rq_resp;
1da177e4 LT	389	struct nlm_host *host;
	390	struct nlm_file *file;
	391
	392	dprintk("lockd: SHARE called\n");
	393
	394	resp->cookie = argp->cookie;
	395
	396	/* Don't accept new lock requests during grace period */
5ccb0066	397	if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
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 create the share */
	407	resp->status = cast_status(nlmsvc_share_file(host, file, argp));
	408
	409	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
67216b94	410	nlmsvc_release_host(host);
1da177e4 LT	411	nlm_release_file(file);
	412	return rpc_success;
	413	}
	414
	415	/*
	416	* UNSHARE: Release a DOS share.
	417	*/
7111c66e	418	static __be32
a6beb732	419	nlmsvc_proc_unshare(struct svc_rqst *rqstp)
1da177e4	420	{
a6beb732 CH	421	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	422	struct nlm_res *resp = rqstp->rq_resp;
1da177e4 LT	423	struct nlm_host *host;
	424	struct nlm_file *file;
	425
	426	dprintk("lockd: UNSHARE called\n");
	427
	428	resp->cookie = argp->cookie;
	429
	430	/* Don't accept requests during grace period */
5ccb0066	431	if (locks_in_grace(SVC_NET(rqstp))) {
1da177e4 LT	432	resp->status = nlm_lck_denied_grace_period;
	433	return rpc_success;
	434	}
	435
	436	/* Obtain client and file */
	437	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	438	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	439
	440	/* Now try to unshare the file */
	441	resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
	442
	443	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
67216b94	444	nlmsvc_release_host(host);
1da177e4 LT	445	nlm_release_file(file);
	446	return rpc_success;
	447	}
	448
	449	/*
	450	* NM_LOCK: Create an unmonitored lock
	451	*/
7111c66e	452	static __be32
a6beb732	453	nlmsvc_proc_nm_lock(struct svc_rqst *rqstp)
1da177e4	454	{
a6beb732 CH	455	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	456
1da177e4 LT	457	dprintk("lockd: NM_LOCK called\n");
	458
	459	argp->monitor = 0; /* just clean the monitor flag */
a6beb732	460	return nlmsvc_proc_lock(rqstp);
1da177e4 LT	461	}
	462
	463	/*
	464	* FREE_ALL: Release all locks and shares held by client
	465	*/
7111c66e	466	static __be32
a6beb732	467	nlmsvc_proc_free_all(struct svc_rqst *rqstp)
1da177e4	468	{
a6beb732	469	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	470	struct nlm_host *host;
	471
	472	/* Obtain client */
	473	if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
	474	return rpc_success;
	475
	476	nlmsvc_free_host_resources(host);
67216b94	477	nlmsvc_release_host(host);
1da177e4 LT	478	return rpc_success;
	479	}
	480
	481	/*
	482	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	483	*/
7111c66e	484	static __be32
a6beb732	485	nlmsvc_proc_sm_notify(struct svc_rqst *rqstp)
1da177e4	486	{
a6beb732 CH	487	struct nlm_reboot *argp = rqstp->rq_argp;
a6beb732 CH	488
1da177e4	489	dprintk("lockd: SM_NOTIFY called\n");
b85e4676 CL	490
b85e4676 CL	491	if (!nlm_privileged_requester(rqstp)) {
ad06e4bd CL	492	char buf[RPC_MAX_ADDRBUFLEN];
	493	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	494	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	495	return rpc_system_err;
	496	}
	497
0ad95472	498	nlm_host_rebooted(SVC_NET(rqstp), argp);
1da177e4 LT	499	return rpc_success;
	500	}
	501
	502	/*
	503	* client sent a GRANTED_RES, let's remove the associated block
	504	*/
7111c66e	505	static __be32
a6beb732	506	nlmsvc_proc_granted_res(struct svc_rqst *rqstp)
1da177e4	507	{
a6beb732 CH	508	struct nlm_res *argp = rqstp->rq_argp;
a6beb732 CH	509
1da177e4 LT	510	if (!nlmsvc_ops)
	511	return rpc_success;
	512
	513	dprintk("lockd: GRANTED_RES called\n");
	514
39be4502	515	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	516	return rpc_success;
	517	}
	518
1da177e4 LT	519	/*
	520	* NLM Server procedures.
	521	*/
	522
	523	#define nlmsvc_encode_norep nlmsvc_encode_void
	524	#define nlmsvc_decode_norep nlmsvc_decode_void
	525	#define nlmsvc_decode_testres nlmsvc_decode_void
	526	#define nlmsvc_decode_lockres nlmsvc_decode_void
	527	#define nlmsvc_decode_unlockres nlmsvc_decode_void
	528	#define nlmsvc_decode_cancelres nlmsvc_decode_void
	529	#define nlmsvc_decode_grantedres nlmsvc_decode_void
	530
	531	#define nlmsvc_proc_none nlmsvc_proc_null
	532	#define nlmsvc_proc_test_res nlmsvc_proc_null
	533	#define nlmsvc_proc_lock_res nlmsvc_proc_null
	534	#define nlmsvc_proc_cancel_res nlmsvc_proc_null
	535	#define nlmsvc_proc_unlock_res nlmsvc_proc_null
	536
	537	struct nlm_void { int dummy; };
	538
	539	#define PROC(name, xargt, xrest, argt, rest, respsize) \
a6beb732	540	{ .pc_func = nlmsvc_proc_##name, \
026fec7e	541	.pc_decode = nlmsvc_decode_##xargt, \
63f8de37	542	.pc_encode = nlmsvc_encode_##xrest, \
1da177e4 LT	543	.pc_release = NULL, \
	544	.pc_argsize = sizeof(struct nlm_##argt), \
	545	.pc_ressize = sizeof(struct nlm_##rest), \
	546	.pc_xdrressize = respsize, \
	547	}
	548
	549	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	550	#define St 1 /* status */
	551	#define No (1+1024/4) /* Net Obj */
	552	#define Rg 2 /* range - offset + size */
	553
860bda29	554	const struct svc_procedure nlmsvc_procedures[] = {
1da177e4 LT	555	PROC(null, void, void, void, void, 1),
	556	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	557	PROC(lock, lockargs, res, args, res, Ck+St),
	558	PROC(cancel, cancargs, res, args, res, Ck+St),
	559	PROC(unlock, unlockargs, res, args, res, Ck+St),
	560	PROC(granted, testargs, res, args, res, Ck+St),
	561	PROC(test_msg, testargs, norep, args, void, 1),
	562	PROC(lock_msg, lockargs, norep, args, void, 1),
	563	PROC(cancel_msg, cancargs, norep, args, void, 1),
	564	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	565	PROC(granted_msg, testargs, norep, args, void, 1),
	566	PROC(test_res, testres, norep, res, void, 1),
	567	PROC(lock_res, lockres, norep, res, void, 1),
	568	PROC(cancel_res, cancelres, norep, res, void, 1),
	569	PROC(unlock_res, unlockres, norep, res, void, 1),
	570	PROC(granted_res, res, norep, res, void, 1),
	571	/* statd callback */
	572	PROC(sm_notify, reboot, void, reboot, void, 1),
	573	PROC(none, void, void, void, void, 1),
	574	PROC(none, void, void, void, void, 1),
	575	PROC(none, void, void, void, void, 1),
	576	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	577	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	578	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	579	PROC(free_all, notify, void, args, void, 0),
	580
	581	};