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

// SPDX-License-Identifier: GPL-2.0
/*
 * 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 <[email protected]>
 */

#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 (!refcount_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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* linux/fs/lockd/svcproc.c
	4	*
	5	* Lockd server procedures. We don't implement the NLM_*_RES
	6	* procedures because we don't use the async procedures.
	7	*
	8	* Copyright (C) 1996, Olaf Kirch <[email protected]>
	9	*/
	10
1da177e4 LT	11	#include <linux/types.h>
1da177e4 LT	12	#include <linux/time.h>
1da177e4 LT	13	#include <linux/lockd/lockd.h>
1da177e4 LT	14	#include <linux/lockd/share.h>
5ccb0066	15	#include <linux/sunrpc/svc_xprt.h>
1da177e4 LT	16
	17	#define NLMDBG_FACILITY NLMDBG_CLIENT
	18
1da177e4	19	#ifdef CONFIG_LOCKD_V4
52921e02 AV	20	static __be32
52921e02 AV	21	cast_to_nlm(__be32 status, u32 vers)
1da177e4 LT	22	{
	23	/* Note: status is assumed to be in network byte order !!! */
	24	if (vers != 4){
	25	switch (status) {
	26	case nlm_granted:
	27	case nlm_lck_denied:
	28	case nlm_lck_denied_nolocks:
	29	case nlm_lck_blocked:
	30	case nlm_lck_denied_grace_period:
5ea0d750	31	case nlm_drop_reply:
1da177e4 LT	32	break;
	33	case nlm4_deadlock:
	34	status = nlm_lck_denied;
	35	break;
	36	default:
	37	status = nlm_lck_denied_nolocks;
	38	}
	39	}
	40
	41	return (status);
	42	}
	43	#define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
	44	#else
	45	#define cast_status(status) (status)
	46	#endif
	47
	48	/*
	49	* Obtain client and file from arguments
	50	*/
52921e02	51	static __be32
1da177e4 LT	52	nlmsvc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	53	struct nlm_host hostp, struct nlm_file filp)
	54	{
	55	struct nlm_host *host = NULL;
	56	struct nlm_file *file = NULL;
	57	struct nlm_lock *lock = &argp->lock;
52921e02	58	__be32 error = 0;
1da177e4 LT	59
	60	/* nfsd callbacks must have been installed for this procedure */
	61	if (!nlmsvc_ops)
	62	return nlm_lck_denied_nolocks;
	63
	64	/* Obtain host handle */
db4e4c9a	65	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
977faf39	66	\|\| (argp->monitor && nsm_monitor(host) < 0))
1da177e4 LT	67	goto no_locks;
	68	*hostp = host;
	69
	70	/* Obtain file pointer. Not used by FREE_ALL call. */
	71	if (filp != NULL) {
cd0b16c1 TM	72	error = cast_status(nlm_lookup_file(rqstp, &file, &lock->fh));
cd0b16c1 TM	73	if (error != 0)
1da177e4 LT	74	goto no_locks;
	75	*filp = file;
	76
	77	/* Set up the missing parts of the file_lock structure */
	78	lock->fl.fl_file = file->f_file;
	79	lock->fl.fl_owner = (fl_owner_t) host;
	80	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	81	}
	82
	83	return 0;
	84
	85	no_locks:
67216b94	86	nlmsvc_release_host(host);
d343fce1 N	87	if (error)
d343fce1 N	88	return error;
1da177e4 LT	89	return nlm_lck_denied_nolocks;
	90	}
	91
	92	/*
	93	* NULL: Test for presence of service
	94	*/
7111c66e	95	static __be32
a6beb732	96	nlmsvc_proc_null(struct svc_rqst *rqstp)
1da177e4 LT	97	{
	98	dprintk("lockd: NULL called\n");
	99	return rpc_success;
	100	}
	101
	102	/*
	103	* TEST: Check for conflicting lock
	104	*/
7111c66e	105	static __be32
a6beb732	106	__nlmsvc_proc_test(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	107	{
a6beb732	108	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	109	struct nlm_host *host;
1da177e4 LT	110	struct nlm_file *file;
317602f3	111	__be32 rc = rpc_success;
1da177e4 LT	112
	113	dprintk("lockd: TEST called\n");
	114	resp->cookie = argp->cookie;
	115
1da177e4 LT	116	/* Obtain client and file */
1da177e4 LT	117	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	118	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	119
1da177e4 LT	120	/* Now check for conflicting locks */
8f920d5e	121	resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie));
5ea0d750	122	if (resp->status == nlm_drop_reply)
b7e6b869 OD	123	rc = rpc_drop_reply;
	124	else
	125	dprintk("lockd: TEST status %d vers %d\n",
	126	ntohl(resp->status), rqstp->rq_vers);
1da177e4	127
67216b94	128	nlmsvc_release_host(host);
1da177e4	129	nlm_release_file(file);
b7e6b869	130	return rc;
1da177e4 LT	131	}
1da177e4 LT	132
7111c66e	133	static __be32
a6beb732	134	nlmsvc_proc_test(struct svc_rqst *rqstp)
1da177e4	135	{
a6beb732 CH	136	return __nlmsvc_proc_test(rqstp, rqstp->rq_resp);
	137	}
	138
	139	static __be32
	140	__nlmsvc_proc_lock(struct svc_rqst rqstp, struct nlm_res resp)
	141	{
	142	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	143	struct nlm_host *host;
1da177e4 LT	144	struct nlm_file *file;
317602f3	145	__be32 rc = rpc_success;
1da177e4 LT	146
	147	dprintk("lockd: LOCK called\n");
	148
	149	resp->cookie = argp->cookie;
	150
1da177e4 LT	151	/* Obtain client and file */
1da177e4 LT	152	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	153	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	154
	155	#if 0
	156	/* If supplied state doesn't match current state, we assume it's
	157	* an old request that time-warped somehow. Any error return would
	158	* do in this case because it's irrelevant anyway.
	159	*
	160	* NB: We don't retrieve the remote host's state yet.
	161	*/
	162	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	163	resp->status = nlm_lck_denied_nolocks;
	164	} else
	165	#endif
	166
	167	/* Now try to lock the file */
6cde4de8	168	resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock,
b2b50289 BF	169	argp->block, &argp->cookie,
b2b50289 BF	170	argp->reclaim));
1a8322b2	171	if (resp->status == nlm_drop_reply)
b7e6b869 OD	172	rc = rpc_drop_reply;
	173	else
	174	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
1da177e4	175
67216b94	176	nlmsvc_release_host(host);
1da177e4	177	nlm_release_file(file);
b7e6b869	178	return rc;
1da177e4 LT	179	}
1da177e4 LT	180
7111c66e	181	static __be32
a6beb732 CH	182	nlmsvc_proc_lock(struct svc_rqst *rqstp)
	183	{
	184	return __nlmsvc_proc_lock(rqstp, rqstp->rq_resp);
	185	}
	186
	187	static __be32
	188	__nlmsvc_proc_cancel(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	189	{
a6beb732	190	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	191	struct nlm_host *host;
1da177e4 LT	192	struct nlm_file *file;
5ccb0066	193	struct net *net = SVC_NET(rqstp);
1da177e4 LT	194
	195	dprintk("lockd: CANCEL called\n");
	196
	197	resp->cookie = argp->cookie;
	198
	199	/* Don't accept requests during grace period */
5ccb0066	200	if (locks_in_grace(net)) {
1da177e4 LT	201	resp->status = nlm_lck_denied_grace_period;
	202	return rpc_success;
	203	}
	204
	205	/* Obtain client and file */
	206	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	207	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	208
1da177e4 LT	209	/* Try to cancel request. */
5ccb0066	210	resp->status = cast_status(nlmsvc_cancel_blocked(net, file, &argp->lock));
1da177e4 LT	211
1da177e4 LT	212	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
67216b94	213	nlmsvc_release_host(host);
1da177e4 LT	214	nlm_release_file(file);
	215	return rpc_success;
	216	}
	217
a6beb732 CH	218	static __be32
	219	nlmsvc_proc_cancel(struct svc_rqst *rqstp)
	220	{
	221	return __nlmsvc_proc_cancel(rqstp, rqstp->rq_resp);
	222	}
	223
1da177e4 LT	224	/*
	225	* UNLOCK: release a lock
	226	*/
7111c66e	227	static __be32
a6beb732	228	__nlmsvc_proc_unlock(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	229	{
a6beb732	230	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	231	struct nlm_host *host;
1da177e4 LT	232	struct nlm_file *file;
5ccb0066	233	struct net *net = SVC_NET(rqstp);
1da177e4 LT	234
	235	dprintk("lockd: UNLOCK called\n");
	236
	237	resp->cookie = argp->cookie;
	238
	239	/* Don't accept new lock requests during grace period */
5ccb0066	240	if (locks_in_grace(net)) {
1da177e4 LT	241	resp->status = nlm_lck_denied_grace_period;
	242	return rpc_success;
	243	}
	244
	245	/* Obtain client and file */
	246	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	247	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	248
1da177e4 LT	249	/* Now try to remove the lock */
5ccb0066	250	resp->status = cast_status(nlmsvc_unlock(net, file, &argp->lock));
1da177e4 LT	251
1da177e4 LT	252	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
67216b94	253	nlmsvc_release_host(host);
1da177e4 LT	254	nlm_release_file(file);
	255	return rpc_success;
	256	}
	257
a6beb732 CH	258	static __be32
	259	nlmsvc_proc_unlock(struct svc_rqst *rqstp)
	260	{
	261	return __nlmsvc_proc_unlock(rqstp, rqstp->rq_resp);
	262	}
	263
1da177e4 LT	264	/*
	265	* GRANTED: A server calls us to tell that a process' lock request
	266	* was granted
	267	*/
7111c66e	268	static __be32
a6beb732	269	__nlmsvc_proc_granted(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	270	{
a6beb732 CH	271	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	272
1da177e4 LT	273	resp->cookie = argp->cookie;
	274
	275	dprintk("lockd: GRANTED called\n");
dcff09f1	276	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
1da177e4 LT	277	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	278	return rpc_success;
	279	}
	280
a6beb732 CH	281	static __be32
	282	nlmsvc_proc_granted(struct svc_rqst *rqstp)
	283	{
	284	return __nlmsvc_proc_granted(rqstp, rqstp->rq_resp);
	285	}
	286
d4716624 TM	287	/*
	288	* This is the generic lockd callback for async RPC calls
	289	*/
	290	static void nlmsvc_callback_exit(struct rpc_task task, void data)
	291	{
c041b5ff	292	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	293	-task->tk_status);
	294	}
	295
7db836d4 CL	296	void nlmsvc_release_call(struct nlm_rqst *call)
7db836d4 CL	297	{
fbca30c5	298	if (!refcount_dec_and_test(&call->a_count))
7db836d4	299	return;
67216b94	300	nlmsvc_release_host(call->a_host);
7db836d4 CL	301	kfree(call);
	302	}
	303
d4716624 TM	304	static void nlmsvc_callback_release(void *data)
d4716624 TM	305	{
7db836d4	306	nlmsvc_release_call(data);
d4716624 TM	307	}
	308
	309	static const struct rpc_call_ops nlmsvc_callback_ops = {
	310	.rpc_call_done = nlmsvc_callback_exit,
	311	.rpc_release = nlmsvc_callback_release,
	312	};
	313
1da177e4 LT	314	/*
	315	* `Async' versions of the above service routines. They aren't really,
	316	* because we send the callback before the reply proper. I hope this
	317	* doesn't break any clients.
	318	*/
a6beb732 CH	319	static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc,
a6beb732 CH	320	__be32 (func)(struct svc_rqst , struct nlm_res *))
1da177e4	321	{
a6beb732	322	struct nlm_args *argp = rqstp->rq_argp;
d4716624 TM	323	struct nlm_host *host;
d4716624 TM	324	struct nlm_rqst *call;
7111c66e	325	__be32 stat;
1da177e4	326
db4e4c9a OK	327	host = nlmsvc_lookup_host(rqstp,
	328	argp->lock.caller,
	329	argp->lock.len);
d4716624 TM	330	if (host == NULL)
	331	return rpc_system_err;
	332
	333	call = nlm_alloc_call(host);
446945ab	334	nlmsvc_release_host(host);
d4716624 TM	335	if (call == NULL)
	336	return rpc_system_err;
	337
a6beb732	338	stat = func(rqstp, &call->a_res);
d4716624	339	if (stat != 0) {
7db836d4	340	nlmsvc_release_call(call);
d4716624 TM	341	return stat;
d4716624 TM	342	}
1da177e4	343
d4716624 TM	344	call->a_flags = RPC_TASK_ASYNC;
	345	if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
	346	return rpc_system_err;
	347	return rpc_success;
1da177e4 LT	348	}
1da177e4 LT	349
a6beb732	350	static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp)
1da177e4	351	{
d4716624	352	dprintk("lockd: TEST_MSG called\n");
a6beb732	353	return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, __nlmsvc_proc_test);
d4716624	354	}
1da177e4	355
a6beb732	356	static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp)
d4716624	357	{
1da177e4	358	dprintk("lockd: LOCK_MSG called\n");
a6beb732	359	return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, __nlmsvc_proc_lock);
1da177e4 LT	360	}
1da177e4 LT	361
a6beb732	362	static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp)
1da177e4	363	{
1da177e4	364	dprintk("lockd: CANCEL_MSG called\n");
a6beb732	365	return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, __nlmsvc_proc_cancel);
1da177e4 LT	366	}
1da177e4 LT	367
7111c66e	368	static __be32
a6beb732	369	nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp)
1da177e4	370	{
1da177e4	371	dprintk("lockd: UNLOCK_MSG called\n");
a6beb732	372	return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlmsvc_proc_unlock);
1da177e4 LT	373	}
1da177e4 LT	374
7111c66e	375	static __be32
a6beb732	376	nlmsvc_proc_granted_msg(struct svc_rqst *rqstp)
1da177e4	377	{
1da177e4	378	dprintk("lockd: GRANTED_MSG called\n");
a6beb732	379	return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, __nlmsvc_proc_granted);
1da177e4 LT	380	}
	381
	382	/*
	383	* SHARE: create a DOS share or alter existing share.
	384	*/
7111c66e	385	static __be32
a6beb732	386	nlmsvc_proc_share(struct svc_rqst *rqstp)
1da177e4	387	{
a6beb732 CH	388	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	389	struct nlm_res *resp = rqstp->rq_resp;
1da177e4 LT	390	struct nlm_host *host;
	391	struct nlm_file *file;
	392
	393	dprintk("lockd: SHARE called\n");
	394
	395	resp->cookie = argp->cookie;
	396
	397	/* Don't accept new lock requests during grace period */
5ccb0066	398	if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
1da177e4 LT	399	resp->status = nlm_lck_denied_grace_period;
	400	return rpc_success;
	401	}
	402
	403	/* Obtain client and file */
	404	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	405	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	406
	407	/* Now try to create the share */
	408	resp->status = cast_status(nlmsvc_share_file(host, file, argp));
	409
	410	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
67216b94	411	nlmsvc_release_host(host);
1da177e4 LT	412	nlm_release_file(file);
	413	return rpc_success;
	414	}
	415
	416	/*
	417	* UNSHARE: Release a DOS share.
	418	*/
7111c66e	419	static __be32
a6beb732	420	nlmsvc_proc_unshare(struct svc_rqst *rqstp)
1da177e4	421	{
a6beb732 CH	422	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	423	struct nlm_res *resp = rqstp->rq_resp;
1da177e4 LT	424	struct nlm_host *host;
	425	struct nlm_file *file;
	426
	427	dprintk("lockd: UNSHARE called\n");
	428
	429	resp->cookie = argp->cookie;
	430
	431	/* Don't accept requests during grace period */
5ccb0066	432	if (locks_in_grace(SVC_NET(rqstp))) {
1da177e4 LT	433	resp->status = nlm_lck_denied_grace_period;
	434	return rpc_success;
	435	}
	436
	437	/* Obtain client and file */
	438	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	439	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	440
	441	/* Now try to unshare the file */
	442	resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
	443
	444	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
67216b94	445	nlmsvc_release_host(host);
1da177e4 LT	446	nlm_release_file(file);
	447	return rpc_success;
	448	}
	449
	450	/*
	451	* NM_LOCK: Create an unmonitored lock
	452	*/
7111c66e	453	static __be32
a6beb732	454	nlmsvc_proc_nm_lock(struct svc_rqst *rqstp)
1da177e4	455	{
a6beb732 CH	456	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	457
1da177e4 LT	458	dprintk("lockd: NM_LOCK called\n");
	459
	460	argp->monitor = 0; /* just clean the monitor flag */
a6beb732	461	return nlmsvc_proc_lock(rqstp);
1da177e4 LT	462	}
	463
	464	/*
	465	* FREE_ALL: Release all locks and shares held by client
	466	*/
7111c66e	467	static __be32
a6beb732	468	nlmsvc_proc_free_all(struct svc_rqst *rqstp)
1da177e4	469	{
a6beb732	470	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	471	struct nlm_host *host;
	472
	473	/* Obtain client */
	474	if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
	475	return rpc_success;
	476
	477	nlmsvc_free_host_resources(host);
67216b94	478	nlmsvc_release_host(host);
1da177e4 LT	479	return rpc_success;
	480	}
	481
	482	/*
	483	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	484	*/
7111c66e	485	static __be32
a6beb732	486	nlmsvc_proc_sm_notify(struct svc_rqst *rqstp)
1da177e4	487	{
a6beb732 CH	488	struct nlm_reboot *argp = rqstp->rq_argp;
a6beb732 CH	489
1da177e4	490	dprintk("lockd: SM_NOTIFY called\n");
b85e4676 CL	491
b85e4676 CL	492	if (!nlm_privileged_requester(rqstp)) {
ad06e4bd CL	493	char buf[RPC_MAX_ADDRBUFLEN];
	494	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	495	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	496	return rpc_system_err;
	497	}
	498
0ad95472	499	nlm_host_rebooted(SVC_NET(rqstp), argp);
1da177e4 LT	500	return rpc_success;
	501	}
	502
	503	/*
	504	* client sent a GRANTED_RES, let's remove the associated block
	505	*/
7111c66e	506	static __be32
a6beb732	507	nlmsvc_proc_granted_res(struct svc_rqst *rqstp)
1da177e4	508	{
a6beb732 CH	509	struct nlm_res *argp = rqstp->rq_argp;
a6beb732 CH	510
1da177e4 LT	511	if (!nlmsvc_ops)
	512	return rpc_success;
	513
	514	dprintk("lockd: GRANTED_RES called\n");
	515
39be4502	516	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	517	return rpc_success;
	518	}
	519
1da177e4 LT	520	/*
	521	* NLM Server procedures.
	522	*/
	523
	524	#define nlmsvc_encode_norep nlmsvc_encode_void
	525	#define nlmsvc_decode_norep nlmsvc_decode_void
	526	#define nlmsvc_decode_testres nlmsvc_decode_void
	527	#define nlmsvc_decode_lockres nlmsvc_decode_void
	528	#define nlmsvc_decode_unlockres nlmsvc_decode_void
	529	#define nlmsvc_decode_cancelres nlmsvc_decode_void
	530	#define nlmsvc_decode_grantedres nlmsvc_decode_void
	531
	532	#define nlmsvc_proc_none nlmsvc_proc_null
	533	#define nlmsvc_proc_test_res nlmsvc_proc_null
	534	#define nlmsvc_proc_lock_res nlmsvc_proc_null
	535	#define nlmsvc_proc_cancel_res nlmsvc_proc_null
	536	#define nlmsvc_proc_unlock_res nlmsvc_proc_null
	537
	538	struct nlm_void { int dummy; };
	539
	540	#define PROC(name, xargt, xrest, argt, rest, respsize) \
a6beb732	541	{ .pc_func = nlmsvc_proc_##name, \
026fec7e	542	.pc_decode = nlmsvc_decode_##xargt, \
63f8de37	543	.pc_encode = nlmsvc_encode_##xrest, \
1da177e4 LT	544	.pc_release = NULL, \
	545	.pc_argsize = sizeof(struct nlm_##argt), \
	546	.pc_ressize = sizeof(struct nlm_##rest), \
	547	.pc_xdrressize = respsize, \
	548	}
	549
	550	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	551	#define St 1 /* status */
	552	#define No (1+1024/4) /* Net Obj */
	553	#define Rg 2 /* range - offset + size */
	554
860bda29	555	const struct svc_procedure nlmsvc_procedures[] = {
1da177e4 LT	556	PROC(null, void, void, void, void, 1),
	557	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	558	PROC(lock, lockargs, res, args, res, Ck+St),
	559	PROC(cancel, cancargs, res, args, res, Ck+St),
	560	PROC(unlock, unlockargs, res, args, res, Ck+St),
	561	PROC(granted, testargs, res, args, res, Ck+St),
	562	PROC(test_msg, testargs, norep, args, void, 1),
	563	PROC(lock_msg, lockargs, norep, args, void, 1),
	564	PROC(cancel_msg, cancargs, norep, args, void, 1),
	565	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	566	PROC(granted_msg, testargs, norep, args, void, 1),
	567	PROC(test_res, testres, norep, res, void, 1),
	568	PROC(lock_res, lockres, norep, res, void, 1),
	569	PROC(cancel_res, cancelres, norep, res, void, 1),
	570	PROC(unlock_res, unlockres, norep, res, void, 1),
	571	PROC(granted_res, res, norep, res, void, 1),
	572	/* statd callback */
	573	PROC(sm_notify, reboot, void, reboot, void, 1),
	574	PROC(none, void, void, void, void, 1),
	575	PROC(none, void, void, void, void, 1),
	576	PROC(none, void, void, void, void, 1),
	577	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	578	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	579	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	580	PROC(free_all, notify, void, args, void, 0),
	581
	582	};