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