[mirror_ubuntu-bionic-kernel.git] / fs / lockd / svc4proc.c

// SPDX-License-Identifier: GPL-2.0
/*
 * linux/fs/lockd/svc4proc.c
 *
 * Lockd server procedures. We don't implement the NLM_*_RES 
 * procedures because we don't use the async procedures.
 *
 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
 */

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

#define NLMDBG_FACILITY		NLMDBG_CLIENT

/*
 * Obtain client and file from arguments
 */
static __be32
nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
			struct nlm_host **hostp, struct nlm_file **filp)
{
	struct nlm_host		*host = NULL;
	struct nlm_file		*file = NULL;
	struct nlm_lock		*lock = &argp->lock;
	__be32			error = 0;

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

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

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

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

	return 0;

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

/*
 * NULL: Test for presence of service
 */
static __be32
nlm4svc_proc_null(struct svc_rqst *rqstp)
{
	dprintk("lockd: NULL          called\n");
	return rpc_success;
}

/*
 * TEST: Check for conflicting lock
 */
static __be32
__nlm4svc_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: TEST4        called\n");
	resp->cookie = argp->cookie;

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now check for conflicting locks */
	resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
	if (resp->status == nlm_drop_reply)
		rc = rpc_drop_reply;
	else
		dprintk("lockd: TEST4        status %d\n", ntohl(resp->status));

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

static __be32
nlm4svc_proc_test(struct svc_rqst *rqstp)
{
	return __nlm4svc_proc_test(rqstp, rqstp->rq_resp);
}

static __be32
__nlm4svc_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 = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

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

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

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

static __be32
nlm4svc_proc_lock(struct svc_rqst *rqstp)
{
	return __nlm4svc_proc_lock(rqstp, rqstp->rq_resp);
}

static __be32
__nlm4svc_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;

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

	resp->cookie = argp->cookie;

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

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

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

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

static __be32
nlm4svc_proc_cancel(struct svc_rqst *rqstp)
{
	return __nlm4svc_proc_cancel(rqstp, rqstp->rq_resp);
}

/*
 * UNLOCK: release a lock
 */
static __be32
__nlm4svc_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;

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

	resp->cookie = argp->cookie;

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

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

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

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

static __be32
nlm4svc_proc_unlock(struct svc_rqst *rqstp)
{
	return __nlm4svc_proc_unlock(rqstp, rqstp->rq_resp);
}

/*
 * GRANTED: A server calls us to tell that a process' lock request
 * was granted
 */
static __be32
__nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_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
nlm4svc_proc_granted(struct svc_rqst *rqstp)
{
	return __nlm4svc_proc_granted(rqstp, rqstp->rq_resp);
}

/*
 * This is the generic lockd callback for async RPC calls
 */
static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
{
	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
			-task->tk_status);
}

static void nlm4svc_callback_release(void *data)
{
	nlmsvc_release_call(data);
}

static const struct rpc_call_ops nlm4svc_callback_ops = {
	.rpc_call_done = nlm4svc_callback_exit,
	.rpc_release = nlm4svc_callback_release,
};

/*
 * `Async' versions of the above service routines. They aren't really,
 * because we send the callback before the reply proper. I hope this
 * doesn't break any clients.
 */
static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc,
		__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, &nlm4svc_callback_ops) < 0)
		return rpc_system_err;
	return rpc_success;
}

static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp)
{
	dprintk("lockd: TEST_MSG      called\n");
	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, __nlm4svc_proc_test);
}

static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp)
{
	dprintk("lockd: LOCK_MSG      called\n");
	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, __nlm4svc_proc_lock);
}

static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp)
{
	dprintk("lockd: CANCEL_MSG    called\n");
	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, __nlm4svc_proc_cancel);
}

static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp)
{
	dprintk("lockd: UNLOCK_MSG    called\n");
	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlm4svc_proc_unlock);
}

static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp)
{
	dprintk("lockd: GRANTED_MSG   called\n");
	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, __nlm4svc_proc_granted);
}

/*
 * SHARE: create a DOS share or alter existing share.
 */
static __be32
nlm4svc_proc_share(struct svc_rqst *rqstp)
{
	struct nlm_args *argp = 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 = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

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

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

/*
 * UNSHARE: Release a DOS share.
 */
static __be32
nlm4svc_proc_unshare(struct svc_rqst *rqstp)
{
	struct nlm_args *argp = 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 = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

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

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

/*
 * NM_LOCK: Create an unmonitored lock
 */
static __be32
nlm4svc_proc_nm_lock(struct svc_rqst *rqstp)
{
	struct nlm_args *argp = rqstp->rq_argp;

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

	argp->monitor = 0;		/* just clean the monitor flag */
	return nlm4svc_proc_lock(rqstp);
}

/*
 * FREE_ALL: Release all locks and shares held by client
 */
static __be32
nlm4svc_proc_free_all(struct svc_rqst *rqstp)
{
	struct nlm_args *argp = rqstp->rq_argp;
	struct nlm_host	*host;

	/* Obtain client */
	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
		return rpc_success;

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

/*
 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
 */
static __be32
nlm4svc_proc_sm_notify(struct svc_rqst *rqstp)
{
	struct nlm_reboot *argp = 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
nlm4svc_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 nlm4svc_encode_norep	nlm4svc_encode_void
#define nlm4svc_decode_norep	nlm4svc_decode_void
#define nlm4svc_decode_testres	nlm4svc_decode_void
#define nlm4svc_decode_lockres	nlm4svc_decode_void
#define nlm4svc_decode_unlockres	nlm4svc_decode_void
#define nlm4svc_decode_cancelres	nlm4svc_decode_void
#define nlm4svc_decode_grantedres	nlm4svc_decode_void

#define nlm4svc_proc_none	nlm4svc_proc_null
#define nlm4svc_proc_test_res	nlm4svc_proc_null
#define nlm4svc_proc_lock_res	nlm4svc_proc_null
#define nlm4svc_proc_cancel_res	nlm4svc_proc_null
#define nlm4svc_proc_unlock_res	nlm4svc_proc_null

struct nlm_void			{ int dummy; };

#define PROC(name, xargt, xrest, argt, rest, respsize)	\
 { .pc_func	= nlm4svc_proc_##name,	\
   .pc_decode	= nlm4svc_decode_##xargt,	\
   .pc_encode	= nlm4svc_encode_##xrest,	\
   .pc_release	= NULL,					\
   .pc_argsize	= sizeof(struct nlm_##argt),		\
   .pc_ressize	= sizeof(struct nlm_##rest),		\
   .pc_xdrressize = respsize,				\
 }
#define	Ck	(1+XDR_QUADLEN(NLM_MAXCOOKIELEN))	/* cookie */
#define	No	(1+1024/4)				/* netobj */
#define	St	1					/* status */
#define	Rg	4					/* range (offset + length) */
const struct svc_procedure nlmsvc_procedures4[] = {
  PROC(null,		void,		void,		void,	void, 1),
  PROC(test,		testargs,	testres,	args,	res, Ck+St+2+No+Rg),
  PROC(lock,		lockargs,	res,		args,	res, Ck+St),
  PROC(cancel,		cancargs,	res,		args,	res, Ck+St),
  PROC(unlock,		unlockargs,	res,		args,	res, Ck+St),
  PROC(granted,		testargs,	res,		args,	res, Ck+St),
  PROC(test_msg,	testargs,	norep,		args,	void, 1),
  PROC(lock_msg,	lockargs,	norep,		args,	void, 1),
  PROC(cancel_msg,	cancargs,	norep,		args,	void, 1),
  PROC(unlock_msg,	unlockargs,	norep,		args,	void, 1),
  PROC(granted_msg,	testargs,	norep,		args,	void, 1),
  PROC(test_res,	testres,	norep,		res,	void, 1),
  PROC(lock_res,	lockres,	norep,		res,	void, 1),
  PROC(cancel_res,	cancelres,	norep,		res,	void, 1),
  PROC(unlock_res,	unlockres,	norep,		res,	void, 1),
  PROC(granted_res,	res,		norep,		res,	void, 1),
  /* statd callback */
  PROC(sm_notify,	reboot,		void,		reboot,	void, 1),
  PROC(none,		void,		void,		void,	void, 0),
  PROC(none,		void,		void,		void,	void, 0),
  PROC(none,		void,		void,		void,	void, 0),
  PROC(share,		shareargs,	shareres,	args,	res, Ck+St+1),
  PROC(unshare,		shareargs,	shareres,	args,	res, Ck+St+1),
  PROC(nm_lock,		lockargs,	res,		args,	res, Ck+St),
  PROC(free_all,	notify,		void,		args,	void, 1),

};
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* linux/fs/lockd/svc4proc.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 <okir@monad.swb.de>
	9	*/
	10
	11	#include <linux/types.h>
	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 LT	19	/*
	20	* Obtain client and file from arguments
	21	*/
52921e02	22	static __be32
1da177e4 LT	23	nlm4svc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	24	struct nlm_host hostp, struct nlm_file filp)
	25	{
	26	struct nlm_host *host = NULL;
	27	struct nlm_file *file = NULL;
	28	struct nlm_lock *lock = &argp->lock;
52921e02	29	__be32 error = 0;
1da177e4 LT	30
	31	/* nfsd callbacks must have been installed for this procedure */
	32	if (!nlmsvc_ops)
	33	return nlm_lck_denied_nolocks;
	34
	35	/* Obtain host handle */
db4e4c9a	36	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
977faf39	37	\|\| (argp->monitor && nsm_monitor(host) < 0))
1da177e4 LT	38	goto no_locks;
	39	*hostp = host;
	40
	41	/* Obtain file pointer. Not used by FREE_ALL call. */
	42	if (filp != NULL) {
	43	if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
	44	goto no_locks;
	45	*filp = file;
	46
	47	/* Set up the missing parts of the file_lock structure */
	48	lock->fl.fl_file = file->f_file;
	49	lock->fl.fl_owner = (fl_owner_t) host;
	50	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	51	}
	52
	53	return 0;
	54
	55	no_locks:
67216b94	56	nlmsvc_release_host(host);
1da177e4 LT	57	if (error)
	58	return error;
	59	return nlm_lck_denied_nolocks;
	60	}
	61
	62	/*
	63	* NULL: Test for presence of service
	64	*/
7111c66e	65	static __be32
a6beb732	66	nlm4svc_proc_null(struct svc_rqst *rqstp)
1da177e4 LT	67	{
	68	dprintk("lockd: NULL called\n");
	69	return rpc_success;
	70	}
	71
	72	/*
	73	* TEST: Check for conflicting lock
	74	*/
7111c66e	75	static __be32
a6beb732	76	__nlm4svc_proc_test(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	77	{
a6beb732	78	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	79	struct nlm_host *host;
1da177e4 LT	80	struct nlm_file *file;
317602f3	81	__be32 rc = rpc_success;
1da177e4 LT	82
	83	dprintk("lockd: TEST4 called\n");
	84	resp->cookie = argp->cookie;
	85
1da177e4 LT	86	/* Obtain client and file */
1da177e4 LT	87	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	88	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	89
1da177e4 LT	90	/* Now check for conflicting locks */
8f920d5e	91	resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
5ea0d750	92	if (resp->status == nlm_drop_reply)
b7e6b869 OD	93	rc = rpc_drop_reply;
	94	else
	95	dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
1da177e4	96
67216b94	97	nlmsvc_release_host(host);
1da177e4	98	nlm_release_file(file);
b7e6b869	99	return rc;
1da177e4 LT	100	}
1da177e4 LT	101
7111c66e	102	static __be32
a6beb732	103	nlm4svc_proc_test(struct svc_rqst *rqstp)
1da177e4	104	{
a6beb732 CH	105	return __nlm4svc_proc_test(rqstp, rqstp->rq_resp);
	106	}
	107
	108	static __be32
	109	__nlm4svc_proc_lock(struct svc_rqst rqstp, struct nlm_res resp)
	110	{
	111	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	112	struct nlm_host *host;
1da177e4 LT	113	struct nlm_file *file;
317602f3	114	__be32 rc = rpc_success;
1da177e4 LT	115
	116	dprintk("lockd: LOCK called\n");
	117
	118	resp->cookie = argp->cookie;
	119
1da177e4 LT	120	/* Obtain client and file */
1da177e4 LT	121	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	122	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	123
	124	#if 0
	125	/* If supplied state doesn't match current state, we assume it's
	126	* an old request that time-warped somehow. Any error return would
	127	* do in this case because it's irrelevant anyway.
	128	*
	129	* NB: We don't retrieve the remote host's state yet.
	130	*/
	131	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	132	resp->status = nlm_lck_denied_nolocks;
	133	} else
	134	#endif
	135
	136	/* Now try to lock the file */
6cde4de8	137	resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
b2b50289 BF	138	argp->block, &argp->cookie,
b2b50289 BF	139	argp->reclaim);
1a8322b2	140	if (resp->status == nlm_drop_reply)
b7e6b869 OD	141	rc = rpc_drop_reply;
	142	else
	143	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
1da177e4	144
67216b94	145	nlmsvc_release_host(host);
1da177e4	146	nlm_release_file(file);
b7e6b869	147	return rc;
1da177e4 LT	148	}
1da177e4 LT	149
7111c66e	150	static __be32
a6beb732 CH	151	nlm4svc_proc_lock(struct svc_rqst *rqstp)
	152	{
	153	return __nlm4svc_proc_lock(rqstp, rqstp->rq_resp);
	154	}
	155
	156	static __be32
	157	__nlm4svc_proc_cancel(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	158	{
a6beb732	159	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	160	struct nlm_host *host;
	161	struct nlm_file *file;
	162
	163	dprintk("lockd: CANCEL called\n");
	164
	165	resp->cookie = argp->cookie;
	166
	167	/* Don't accept requests during grace period */
5ccb0066	168	if (locks_in_grace(SVC_NET(rqstp))) {
1da177e4 LT	169	resp->status = nlm_lck_denied_grace_period;
	170	return rpc_success;
	171	}
	172
	173	/* Obtain client and file */
	174	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	175	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	176
1da177e4 LT	177	/* Try to cancel request. */
5ccb0066	178	resp->status = nlmsvc_cancel_blocked(SVC_NET(rqstp), file, &argp->lock);
1da177e4 LT	179
1da177e4 LT	180	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
67216b94	181	nlmsvc_release_host(host);
1da177e4 LT	182	nlm_release_file(file);
	183	return rpc_success;
	184	}
	185
a6beb732 CH	186	static __be32
	187	nlm4svc_proc_cancel(struct svc_rqst *rqstp)
	188	{
	189	return __nlm4svc_proc_cancel(rqstp, rqstp->rq_resp);
	190	}
	191
1da177e4 LT	192	/*
	193	* UNLOCK: release a lock
	194	*/
7111c66e	195	static __be32
a6beb732	196	__nlm4svc_proc_unlock(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	197	{
a6beb732	198	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	199	struct nlm_host *host;
	200	struct nlm_file *file;
	201
	202	dprintk("lockd: UNLOCK called\n");
	203
	204	resp->cookie = argp->cookie;
	205
	206	/* Don't accept new lock requests during grace period */
5ccb0066	207	if (locks_in_grace(SVC_NET(rqstp))) {
1da177e4 LT	208	resp->status = nlm_lck_denied_grace_period;
	209	return rpc_success;
	210	}
	211
	212	/* Obtain client and file */
	213	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	214	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	215
1da177e4 LT	216	/* Now try to remove the lock */
5ccb0066	217	resp->status = nlmsvc_unlock(SVC_NET(rqstp), file, &argp->lock);
1da177e4 LT	218
1da177e4 LT	219	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
67216b94	220	nlmsvc_release_host(host);
1da177e4 LT	221	nlm_release_file(file);
	222	return rpc_success;
	223	}
	224
a6beb732 CH	225	static __be32
	226	nlm4svc_proc_unlock(struct svc_rqst *rqstp)
	227	{
	228	return __nlm4svc_proc_unlock(rqstp, rqstp->rq_resp);
	229	}
	230
1da177e4 LT	231	/*
	232	* GRANTED: A server calls us to tell that a process' lock request
	233	* was granted
	234	*/
7111c66e	235	static __be32
a6beb732	236	__nlm4svc_proc_granted(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	237	{
a6beb732 CH	238	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	239
1da177e4 LT	240	resp->cookie = argp->cookie;
	241
	242	dprintk("lockd: GRANTED called\n");
dcff09f1	243	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
1da177e4 LT	244	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	245	return rpc_success;
	246	}
	247
a6beb732 CH	248	static __be32
	249	nlm4svc_proc_granted(struct svc_rqst *rqstp)
	250	{
	251	return __nlm4svc_proc_granted(rqstp, rqstp->rq_resp);
	252	}
	253
d4716624 TM	254	/*
	255	* This is the generic lockd callback for async RPC calls
	256	*/
	257	static void nlm4svc_callback_exit(struct rpc_task task, void data)
	258	{
c041b5ff	259	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	260	-task->tk_status);
	261	}
	262
	263	static void nlm4svc_callback_release(void *data)
	264	{
7db836d4	265	nlmsvc_release_call(data);
d4716624 TM	266	}
	267
	268	static const struct rpc_call_ops nlm4svc_callback_ops = {
	269	.rpc_call_done = nlm4svc_callback_exit,
	270	.rpc_release = nlm4svc_callback_release,
	271	};
	272
1da177e4 LT	273	/*
	274	* `Async' versions of the above service routines. They aren't really,
	275	* because we send the callback before the reply proper. I hope this
	276	* doesn't break any clients.
	277	*/
a6beb732 CH	278	static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc,
a6beb732 CH	279	__be32 (func)(struct svc_rqst , struct nlm_res *))
1da177e4	280	{
a6beb732	281	struct nlm_args *argp = rqstp->rq_argp;
d4716624 TM	282	struct nlm_host *host;
d4716624 TM	283	struct nlm_rqst *call;
7111c66e	284	__be32 stat;
1da177e4	285
db4e4c9a OK	286	host = nlmsvc_lookup_host(rqstp,
	287	argp->lock.caller,
	288	argp->lock.len);
d4716624 TM	289	if (host == NULL)
	290	return rpc_system_err;
	291
	292	call = nlm_alloc_call(host);
446945ab	293	nlmsvc_release_host(host);
d4716624 TM	294	if (call == NULL)
	295	return rpc_system_err;
	296
a6beb732	297	stat = func(rqstp, &call->a_res);
d4716624	298	if (stat != 0) {
7db836d4	299	nlmsvc_release_call(call);
d4716624 TM	300	return stat;
d4716624 TM	301	}
1da177e4	302
d4716624 TM	303	call->a_flags = RPC_TASK_ASYNC;
	304	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
	305	return rpc_system_err;
	306	return rpc_success;
1da177e4 LT	307	}
1da177e4 LT	308
a6beb732	309	static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp)
1da177e4	310	{
d4716624	311	dprintk("lockd: TEST_MSG called\n");
a6beb732	312	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, __nlm4svc_proc_test);
d4716624	313	}
1da177e4	314
a6beb732	315	static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp)
d4716624	316	{
1da177e4	317	dprintk("lockd: LOCK_MSG called\n");
a6beb732	318	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, __nlm4svc_proc_lock);
1da177e4 LT	319	}
1da177e4 LT	320
a6beb732	321	static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp)
1da177e4	322	{
1da177e4	323	dprintk("lockd: CANCEL_MSG called\n");
a6beb732	324	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, __nlm4svc_proc_cancel);
1da177e4 LT	325	}
1da177e4 LT	326
a6beb732	327	static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp)
1da177e4	328	{
1da177e4	329	dprintk("lockd: UNLOCK_MSG called\n");
a6beb732	330	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlm4svc_proc_unlock);
1da177e4 LT	331	}
1da177e4 LT	332
a6beb732	333	static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp)
1da177e4	334	{
1da177e4	335	dprintk("lockd: GRANTED_MSG called\n");
a6beb732	336	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, __nlm4svc_proc_granted);
1da177e4 LT	337	}
	338
	339	/*
	340	* SHARE: create a DOS share or alter existing share.
	341	*/
7111c66e	342	static __be32
a6beb732	343	nlm4svc_proc_share(struct svc_rqst *rqstp)
1da177e4	344	{
a6beb732 CH	345	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	346	struct nlm_res *resp = rqstp->rq_resp;
1da177e4 LT	347	struct nlm_host *host;
	348	struct nlm_file *file;
	349
	350	dprintk("lockd: SHARE called\n");
	351
	352	resp->cookie = argp->cookie;
	353
	354	/* Don't accept new lock requests during grace period */
5ccb0066	355	if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
1da177e4 LT	356	resp->status = nlm_lck_denied_grace_period;
	357	return rpc_success;
	358	}
	359
	360	/* Obtain client and file */
	361	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	362	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	363
	364	/* Now try to create the share */
	365	resp->status = nlmsvc_share_file(host, file, argp);
	366
	367	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
67216b94	368	nlmsvc_release_host(host);
1da177e4 LT	369	nlm_release_file(file);
	370	return rpc_success;
	371	}
	372
	373	/*
	374	* UNSHARE: Release a DOS share.
	375	*/
7111c66e	376	static __be32
a6beb732	377	nlm4svc_proc_unshare(struct svc_rqst *rqstp)
1da177e4	378	{
a6beb732 CH	379	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	380	struct nlm_res *resp = rqstp->rq_resp;
1da177e4 LT	381	struct nlm_host *host;
	382	struct nlm_file *file;
	383
	384	dprintk("lockd: UNSHARE called\n");
	385
	386	resp->cookie = argp->cookie;
	387
	388	/* Don't accept requests during grace period */
5ccb0066	389	if (locks_in_grace(SVC_NET(rqstp))) {
1da177e4 LT	390	resp->status = nlm_lck_denied_grace_period;
	391	return rpc_success;
	392	}
	393
	394	/* Obtain client and file */
	395	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	396	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	397
	398	/* Now try to lock the file */
	399	resp->status = nlmsvc_unshare_file(host, file, argp);
	400
	401	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
67216b94	402	nlmsvc_release_host(host);
1da177e4 LT	403	nlm_release_file(file);
	404	return rpc_success;
	405	}
	406
	407	/*
	408	* NM_LOCK: Create an unmonitored lock
	409	*/
7111c66e	410	static __be32
a6beb732	411	nlm4svc_proc_nm_lock(struct svc_rqst *rqstp)
1da177e4	412	{
a6beb732 CH	413	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	414
1da177e4 LT	415	dprintk("lockd: NM_LOCK called\n");
	416
	417	argp->monitor = 0; /* just clean the monitor flag */
a6beb732	418	return nlm4svc_proc_lock(rqstp);
1da177e4 LT	419	}
	420
	421	/*
	422	* FREE_ALL: Release all locks and shares held by client
	423	*/
7111c66e	424	static __be32
a6beb732	425	nlm4svc_proc_free_all(struct svc_rqst *rqstp)
1da177e4	426	{
a6beb732	427	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	428	struct nlm_host *host;
	429
	430	/* Obtain client */
	431	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
	432	return rpc_success;
	433
	434	nlmsvc_free_host_resources(host);
67216b94	435	nlmsvc_release_host(host);
1da177e4 LT	436	return rpc_success;
	437	}
	438
	439	/*
	440	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	441	*/
7111c66e	442	static __be32
a6beb732	443	nlm4svc_proc_sm_notify(struct svc_rqst *rqstp)
1da177e4	444	{
a6beb732 CH	445	struct nlm_reboot *argp = rqstp->rq_argp;
a6beb732 CH	446
1da177e4	447	dprintk("lockd: SM_NOTIFY called\n");
b85e4676 CL	448
b85e4676 CL	449	if (!nlm_privileged_requester(rqstp)) {
ad06e4bd CL	450	char buf[RPC_MAX_ADDRBUFLEN];
	451	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	452	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	453	return rpc_system_err;
	454	}
	455
0ad95472	456	nlm_host_rebooted(SVC_NET(rqstp), argp);
1da177e4 LT	457	return rpc_success;
	458	}
	459
	460	/*
	461	* client sent a GRANTED_RES, let's remove the associated block
	462	*/
7111c66e	463	static __be32
a6beb732	464	nlm4svc_proc_granted_res(struct svc_rqst *rqstp)
1da177e4	465	{
a6beb732 CH	466	struct nlm_res *argp = rqstp->rq_argp;
a6beb732 CH	467
1da177e4 LT	468	if (!nlmsvc_ops)
	469	return rpc_success;
	470
	471	dprintk("lockd: GRANTED_RES called\n");
	472
39be4502	473	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	474	return rpc_success;
	475	}
	476
	477
1da177e4 LT	478	/*
	479	* NLM Server procedures.
	480	*/
	481
	482	#define nlm4svc_encode_norep nlm4svc_encode_void
	483	#define nlm4svc_decode_norep nlm4svc_decode_void
	484	#define nlm4svc_decode_testres nlm4svc_decode_void
	485	#define nlm4svc_decode_lockres nlm4svc_decode_void
	486	#define nlm4svc_decode_unlockres nlm4svc_decode_void
	487	#define nlm4svc_decode_cancelres nlm4svc_decode_void
	488	#define nlm4svc_decode_grantedres nlm4svc_decode_void
	489
	490	#define nlm4svc_proc_none nlm4svc_proc_null
	491	#define nlm4svc_proc_test_res nlm4svc_proc_null
	492	#define nlm4svc_proc_lock_res nlm4svc_proc_null
	493	#define nlm4svc_proc_cancel_res nlm4svc_proc_null
	494	#define nlm4svc_proc_unlock_res nlm4svc_proc_null
	495
	496	struct nlm_void { int dummy; };
	497
	498	#define PROC(name, xargt, xrest, argt, rest, respsize) \
a6beb732	499	{ .pc_func = nlm4svc_proc_##name, \
026fec7e	500	.pc_decode = nlm4svc_decode_##xargt, \
63f8de37	501	.pc_encode = nlm4svc_encode_##xrest, \
1da177e4 LT	502	.pc_release = NULL, \
	503	.pc_argsize = sizeof(struct nlm_##argt), \
	504	.pc_ressize = sizeof(struct nlm_##rest), \
	505	.pc_xdrressize = respsize, \
	506	}
	507	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	508	#define No (1+1024/4) /* netobj */
	509	#define St 1 /* status */
	510	#define Rg 4 /* range (offset + length) */
860bda29	511	const struct svc_procedure nlmsvc_procedures4[] = {
1da177e4 LT	512	PROC(null, void, void, void, void, 1),
	513	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	514	PROC(lock, lockargs, res, args, res, Ck+St),
	515	PROC(cancel, cancargs, res, args, res, Ck+St),
	516	PROC(unlock, unlockargs, res, args, res, Ck+St),
	517	PROC(granted, testargs, res, args, res, Ck+St),
	518	PROC(test_msg, testargs, norep, args, void, 1),
	519	PROC(lock_msg, lockargs, norep, args, void, 1),
	520	PROC(cancel_msg, cancargs, norep, args, void, 1),
	521	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	522	PROC(granted_msg, testargs, norep, args, void, 1),
	523	PROC(test_res, testres, norep, res, void, 1),
	524	PROC(lock_res, lockres, norep, res, void, 1),
	525	PROC(cancel_res, cancelres, norep, res, void, 1),
	526	PROC(unlock_res, unlockres, norep, res, void, 1),
	527	PROC(granted_res, res, norep, res, void, 1),
	528	/* statd callback */
	529	PROC(sm_notify, reboot, void, reboot, void, 1),
	530	PROC(none, void, void, void, void, 0),
	531	PROC(none, void, void, void, void, 0),
	532	PROC(none, void, void, void, void, 0),
	533	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	534	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	535	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	536	PROC(free_all, notify, void, args, void, 1),
	537
	538	};