[people/ms/linux.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_lmops = &nlmsvc_lock_operations;
		nlmsvc_locks_init_private(&lock->fl, host, (pid_t)lock->svid);
		if (!lock->fl.fl_owner) {
			/* lockowner allocation has failed */
			nlmsvc_release_host(host);
			return nlm_lck_denied_nolocks;
		}
	}

	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_lockowner(&argp->lock);
	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_lockowner(&argp->lock);
	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_lockowner(&argp->lock);
	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_lockowner(&argp->lock);
	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_lockowner(&argp->lock);
	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_lockowner(&argp->lock);
	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;
1da177e4	49	lock->fl.fl_lmops = &nlmsvc_lock_operations;
89e0edfb BC	50	nlmsvc_locks_init_private(&lock->fl, host, (pid_t)lock->svid);
	51	if (!lock->fl.fl_owner) {
	52	/* lockowner allocation has failed */
	53	nlmsvc_release_host(host);
	54	return nlm_lck_denied_nolocks;
	55	}
1da177e4 LT	56	}
	57
	58	return 0;
	59
	60	no_locks:
67216b94	61	nlmsvc_release_host(host);
1da177e4 LT	62	if (error)
	63	return error;
	64	return nlm_lck_denied_nolocks;
	65	}
	66
	67	/*
	68	* NULL: Test for presence of service
	69	*/
7111c66e	70	static __be32
a6beb732	71	nlm4svc_proc_null(struct svc_rqst *rqstp)
1da177e4 LT	72	{
	73	dprintk("lockd: NULL called\n");
	74	return rpc_success;
	75	}
	76
	77	/*
	78	* TEST: Check for conflicting lock
	79	*/
7111c66e	80	static __be32
a6beb732	81	__nlm4svc_proc_test(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	82	{
a6beb732	83	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	84	struct nlm_host *host;
1da177e4 LT	85	struct nlm_file *file;
317602f3	86	__be32 rc = rpc_success;
1da177e4 LT	87
	88	dprintk("lockd: TEST4 called\n");
	89	resp->cookie = argp->cookie;
	90
1da177e4 LT	91	/* Obtain client and file */
1da177e4 LT	92	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	93	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	94
1da177e4 LT	95	/* Now check for conflicting locks */
8f920d5e	96	resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
5ea0d750	97	if (resp->status == nlm_drop_reply)
b7e6b869 OD	98	rc = rpc_drop_reply;
	99	else
	100	dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
1da177e4	101
89e0edfb	102	nlmsvc_release_lockowner(&argp->lock);
67216b94	103	nlmsvc_release_host(host);
1da177e4	104	nlm_release_file(file);
b7e6b869	105	return rc;
1da177e4 LT	106	}
1da177e4 LT	107
7111c66e	108	static __be32
a6beb732	109	nlm4svc_proc_test(struct svc_rqst *rqstp)
1da177e4	110	{
a6beb732 CH	111	return __nlm4svc_proc_test(rqstp, rqstp->rq_resp);
	112	}
	113
	114	static __be32
	115	__nlm4svc_proc_lock(struct svc_rqst rqstp, struct nlm_res resp)
	116	{
	117	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	118	struct nlm_host *host;
1da177e4 LT	119	struct nlm_file *file;
317602f3	120	__be32 rc = rpc_success;
1da177e4 LT	121
	122	dprintk("lockd: LOCK called\n");
	123
	124	resp->cookie = argp->cookie;
	125
1da177e4 LT	126	/* Obtain client and file */
1da177e4 LT	127	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	128	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	129
	130	#if 0
	131	/* If supplied state doesn't match current state, we assume it's
	132	* an old request that time-warped somehow. Any error return would
	133	* do in this case because it's irrelevant anyway.
	134	*
	135	* NB: We don't retrieve the remote host's state yet.
	136	*/
	137	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	138	resp->status = nlm_lck_denied_nolocks;
	139	} else
	140	#endif
	141
	142	/* Now try to lock the file */
6cde4de8	143	resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
b2b50289 BF	144	argp->block, &argp->cookie,
b2b50289 BF	145	argp->reclaim);
1a8322b2	146	if (resp->status == nlm_drop_reply)
b7e6b869 OD	147	rc = rpc_drop_reply;
	148	else
	149	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
1da177e4	150
89e0edfb	151	nlmsvc_release_lockowner(&argp->lock);
67216b94	152	nlmsvc_release_host(host);
1da177e4	153	nlm_release_file(file);
b7e6b869	154	return rc;
1da177e4 LT	155	}
1da177e4 LT	156
7111c66e	157	static __be32
a6beb732 CH	158	nlm4svc_proc_lock(struct svc_rqst *rqstp)
	159	{
	160	return __nlm4svc_proc_lock(rqstp, rqstp->rq_resp);
	161	}
	162
	163	static __be32
	164	__nlm4svc_proc_cancel(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	165	{
a6beb732	166	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	167	struct nlm_host *host;
	168	struct nlm_file *file;
	169
	170	dprintk("lockd: CANCEL called\n");
	171
	172	resp->cookie = argp->cookie;
	173
	174	/* Don't accept requests during grace period */
5ccb0066	175	if (locks_in_grace(SVC_NET(rqstp))) {
1da177e4 LT	176	resp->status = nlm_lck_denied_grace_period;
	177	return rpc_success;
	178	}
	179
	180	/* Obtain client and file */
	181	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	182	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	183
1da177e4 LT	184	/* Try to cancel request. */
5ccb0066	185	resp->status = nlmsvc_cancel_blocked(SVC_NET(rqstp), file, &argp->lock);
1da177e4 LT	186
1da177e4 LT	187	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
89e0edfb	188	nlmsvc_release_lockowner(&argp->lock);
67216b94	189	nlmsvc_release_host(host);
1da177e4 LT	190	nlm_release_file(file);
	191	return rpc_success;
	192	}
	193
a6beb732 CH	194	static __be32
	195	nlm4svc_proc_cancel(struct svc_rqst *rqstp)
	196	{
	197	return __nlm4svc_proc_cancel(rqstp, rqstp->rq_resp);
	198	}
	199
1da177e4 LT	200	/*
	201	* UNLOCK: release a lock
	202	*/
7111c66e	203	static __be32
a6beb732	204	__nlm4svc_proc_unlock(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	205	{
a6beb732	206	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	207	struct nlm_host *host;
	208	struct nlm_file *file;
	209
	210	dprintk("lockd: UNLOCK called\n");
	211
	212	resp->cookie = argp->cookie;
	213
	214	/* Don't accept new lock requests during grace period */
5ccb0066	215	if (locks_in_grace(SVC_NET(rqstp))) {
1da177e4 LT	216	resp->status = nlm_lck_denied_grace_period;
	217	return rpc_success;
	218	}
	219
	220	/* Obtain client and file */
	221	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	222	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	223
1da177e4 LT	224	/* Now try to remove the lock */
5ccb0066	225	resp->status = nlmsvc_unlock(SVC_NET(rqstp), file, &argp->lock);
1da177e4 LT	226
1da177e4 LT	227	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
89e0edfb	228	nlmsvc_release_lockowner(&argp->lock);
67216b94	229	nlmsvc_release_host(host);
1da177e4 LT	230	nlm_release_file(file);
	231	return rpc_success;
	232	}
	233
a6beb732 CH	234	static __be32
	235	nlm4svc_proc_unlock(struct svc_rqst *rqstp)
	236	{
	237	return __nlm4svc_proc_unlock(rqstp, rqstp->rq_resp);
	238	}
	239
1da177e4 LT	240	/*
	241	* GRANTED: A server calls us to tell that a process' lock request
	242	* was granted
	243	*/
7111c66e	244	static __be32
a6beb732	245	__nlm4svc_proc_granted(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	246	{
a6beb732 CH	247	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	248
1da177e4 LT	249	resp->cookie = argp->cookie;
	250
	251	dprintk("lockd: GRANTED called\n");
dcff09f1	252	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
1da177e4 LT	253	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	254	return rpc_success;
	255	}
	256
a6beb732 CH	257	static __be32
	258	nlm4svc_proc_granted(struct svc_rqst *rqstp)
	259	{
	260	return __nlm4svc_proc_granted(rqstp, rqstp->rq_resp);
	261	}
	262
d4716624 TM	263	/*
	264	* This is the generic lockd callback for async RPC calls
	265	*/
	266	static void nlm4svc_callback_exit(struct rpc_task task, void data)
	267	{
c041b5ff	268	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	269	-task->tk_status);
	270	}
	271
	272	static void nlm4svc_callback_release(void *data)
	273	{
7db836d4	274	nlmsvc_release_call(data);
d4716624 TM	275	}
	276
	277	static const struct rpc_call_ops nlm4svc_callback_ops = {
	278	.rpc_call_done = nlm4svc_callback_exit,
	279	.rpc_release = nlm4svc_callback_release,
	280	};
	281
1da177e4 LT	282	/*
	283	* `Async' versions of the above service routines. They aren't really,
	284	* because we send the callback before the reply proper. I hope this
	285	* doesn't break any clients.
	286	*/
a6beb732 CH	287	static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc,
a6beb732 CH	288	__be32 (func)(struct svc_rqst , struct nlm_res *))
1da177e4	289	{
a6beb732	290	struct nlm_args *argp = rqstp->rq_argp;
d4716624 TM	291	struct nlm_host *host;
d4716624 TM	292	struct nlm_rqst *call;
7111c66e	293	__be32 stat;
1da177e4	294
db4e4c9a OK	295	host = nlmsvc_lookup_host(rqstp,
	296	argp->lock.caller,
	297	argp->lock.len);
d4716624 TM	298	if (host == NULL)
	299	return rpc_system_err;
	300
	301	call = nlm_alloc_call(host);
446945ab	302	nlmsvc_release_host(host);
d4716624 TM	303	if (call == NULL)
	304	return rpc_system_err;
	305
a6beb732	306	stat = func(rqstp, &call->a_res);
d4716624	307	if (stat != 0) {
7db836d4	308	nlmsvc_release_call(call);
d4716624 TM	309	return stat;
d4716624 TM	310	}
1da177e4	311
d4716624 TM	312	call->a_flags = RPC_TASK_ASYNC;
	313	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
	314	return rpc_system_err;
	315	return rpc_success;
1da177e4 LT	316	}
1da177e4 LT	317
a6beb732	318	static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp)
1da177e4	319	{
d4716624	320	dprintk("lockd: TEST_MSG called\n");
a6beb732	321	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, __nlm4svc_proc_test);
d4716624	322	}
1da177e4	323
a6beb732	324	static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp)
d4716624	325	{
1da177e4	326	dprintk("lockd: LOCK_MSG called\n");
a6beb732	327	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, __nlm4svc_proc_lock);
1da177e4 LT	328	}
1da177e4 LT	329
a6beb732	330	static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp)
1da177e4	331	{
1da177e4	332	dprintk("lockd: CANCEL_MSG called\n");
a6beb732	333	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, __nlm4svc_proc_cancel);
1da177e4 LT	334	}
1da177e4 LT	335
a6beb732	336	static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp)
1da177e4	337	{
1da177e4	338	dprintk("lockd: UNLOCK_MSG called\n");
a6beb732	339	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlm4svc_proc_unlock);
1da177e4 LT	340	}
1da177e4 LT	341
a6beb732	342	static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp)
1da177e4	343	{
1da177e4	344	dprintk("lockd: GRANTED_MSG called\n");
a6beb732	345	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, __nlm4svc_proc_granted);
1da177e4 LT	346	}
	347
	348	/*
	349	* SHARE: create a DOS share or alter existing share.
	350	*/
7111c66e	351	static __be32
a6beb732	352	nlm4svc_proc_share(struct svc_rqst *rqstp)
1da177e4	353	{
a6beb732 CH	354	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	355	struct nlm_res *resp = rqstp->rq_resp;
1da177e4 LT	356	struct nlm_host *host;
	357	struct nlm_file *file;
	358
	359	dprintk("lockd: SHARE called\n");
	360
	361	resp->cookie = argp->cookie;
	362
	363	/* Don't accept new lock requests during grace period */
5ccb0066	364	if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
1da177e4 LT	365	resp->status = nlm_lck_denied_grace_period;
	366	return rpc_success;
	367	}
	368
	369	/* Obtain client and file */
	370	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	371	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	372
	373	/* Now try to create the share */
	374	resp->status = nlmsvc_share_file(host, file, argp);
	375
	376	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
89e0edfb	377	nlmsvc_release_lockowner(&argp->lock);
67216b94	378	nlmsvc_release_host(host);
1da177e4 LT	379	nlm_release_file(file);
	380	return rpc_success;
	381	}
	382
	383	/*
	384	* UNSHARE: Release a DOS share.
	385	*/
7111c66e	386	static __be32
a6beb732	387	nlm4svc_proc_unshare(struct svc_rqst *rqstp)
1da177e4	388	{
a6beb732 CH	389	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	390	struct nlm_res *resp = rqstp->rq_resp;
1da177e4 LT	391	struct nlm_host *host;
	392	struct nlm_file *file;
	393
	394	dprintk("lockd: UNSHARE called\n");
	395
	396	resp->cookie = argp->cookie;
	397
	398	/* Don't accept requests during grace period */
5ccb0066	399	if (locks_in_grace(SVC_NET(rqstp))) {
1da177e4 LT	400	resp->status = nlm_lck_denied_grace_period;
	401	return rpc_success;
	402	}
	403
	404	/* Obtain client and file */
	405	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	406	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	407
	408	/* Now try to lock the file */
	409	resp->status = nlmsvc_unshare_file(host, file, argp);
	410
	411	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
89e0edfb	412	nlmsvc_release_lockowner(&argp->lock);
67216b94	413	nlmsvc_release_host(host);
1da177e4 LT	414	nlm_release_file(file);
	415	return rpc_success;
	416	}
	417
	418	/*
	419	* NM_LOCK: Create an unmonitored lock
	420	*/
7111c66e	421	static __be32
a6beb732	422	nlm4svc_proc_nm_lock(struct svc_rqst *rqstp)
1da177e4	423	{
a6beb732 CH	424	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	425
1da177e4 LT	426	dprintk("lockd: NM_LOCK called\n");
	427
	428	argp->monitor = 0; /* just clean the monitor flag */
a6beb732	429	return nlm4svc_proc_lock(rqstp);
1da177e4 LT	430	}
	431
	432	/*
	433	* FREE_ALL: Release all locks and shares held by client
	434	*/
7111c66e	435	static __be32
a6beb732	436	nlm4svc_proc_free_all(struct svc_rqst *rqstp)
1da177e4	437	{
a6beb732	438	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	439	struct nlm_host *host;
	440
	441	/* Obtain client */
	442	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
	443	return rpc_success;
	444
	445	nlmsvc_free_host_resources(host);
67216b94	446	nlmsvc_release_host(host);
1da177e4 LT	447	return rpc_success;
	448	}
	449
	450	/*
	451	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	452	*/
7111c66e	453	static __be32
a6beb732	454	nlm4svc_proc_sm_notify(struct svc_rqst *rqstp)
1da177e4	455	{
a6beb732 CH	456	struct nlm_reboot *argp = rqstp->rq_argp;
a6beb732 CH	457
1da177e4	458	dprintk("lockd: SM_NOTIFY called\n");
b85e4676 CL	459
b85e4676 CL	460	if (!nlm_privileged_requester(rqstp)) {
ad06e4bd CL	461	char buf[RPC_MAX_ADDRBUFLEN];
	462	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	463	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	464	return rpc_system_err;
	465	}
	466
0ad95472	467	nlm_host_rebooted(SVC_NET(rqstp), argp);
1da177e4 LT	468	return rpc_success;
	469	}
	470
	471	/*
	472	* client sent a GRANTED_RES, let's remove the associated block
	473	*/
7111c66e	474	static __be32
a6beb732	475	nlm4svc_proc_granted_res(struct svc_rqst *rqstp)
1da177e4	476	{
a6beb732 CH	477	struct nlm_res *argp = rqstp->rq_argp;
a6beb732 CH	478
1da177e4 LT	479	if (!nlmsvc_ops)
	480	return rpc_success;
	481
	482	dprintk("lockd: GRANTED_RES called\n");
	483
39be4502	484	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	485	return rpc_success;
	486	}
	487
	488
1da177e4 LT	489	/*
	490	* NLM Server procedures.
	491	*/
	492
	493	#define nlm4svc_encode_norep nlm4svc_encode_void
	494	#define nlm4svc_decode_norep nlm4svc_decode_void
	495	#define nlm4svc_decode_testres nlm4svc_decode_void
	496	#define nlm4svc_decode_lockres nlm4svc_decode_void
	497	#define nlm4svc_decode_unlockres nlm4svc_decode_void
	498	#define nlm4svc_decode_cancelres nlm4svc_decode_void
	499	#define nlm4svc_decode_grantedres nlm4svc_decode_void
	500
	501	#define nlm4svc_proc_none nlm4svc_proc_null
	502	#define nlm4svc_proc_test_res nlm4svc_proc_null
	503	#define nlm4svc_proc_lock_res nlm4svc_proc_null
	504	#define nlm4svc_proc_cancel_res nlm4svc_proc_null
	505	#define nlm4svc_proc_unlock_res nlm4svc_proc_null
	506
	507	struct nlm_void { int dummy; };
	508
	509	#define PROC(name, xargt, xrest, argt, rest, respsize) \
a6beb732	510	{ .pc_func = nlm4svc_proc_##name, \
026fec7e	511	.pc_decode = nlm4svc_decode_##xargt, \
63f8de37	512	.pc_encode = nlm4svc_encode_##xrest, \
1da177e4 LT	513	.pc_release = NULL, \
	514	.pc_argsize = sizeof(struct nlm_##argt), \
	515	.pc_ressize = sizeof(struct nlm_##rest), \
	516	.pc_xdrressize = respsize, \
	517	}
	518	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	519	#define No (1+1024/4) /* netobj */
	520	#define St 1 /* status */
	521	#define Rg 4 /* range (offset + length) */
860bda29	522	const struct svc_procedure nlmsvc_procedures4[] = {
1da177e4 LT	523	PROC(null, void, void, void, void, 1),
	524	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	525	PROC(lock, lockargs, res, args, res, Ck+St),
	526	PROC(cancel, cancargs, res, args, res, Ck+St),
	527	PROC(unlock, unlockargs, res, args, res, Ck+St),
	528	PROC(granted, testargs, res, args, res, Ck+St),
	529	PROC(test_msg, testargs, norep, args, void, 1),
	530	PROC(lock_msg, lockargs, norep, args, void, 1),
	531	PROC(cancel_msg, cancargs, norep, args, void, 1),
	532	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	533	PROC(granted_msg, testargs, norep, args, void, 1),
	534	PROC(test_res, testres, norep, res, void, 1),
	535	PROC(lock_res, lockres, norep, res, void, 1),
	536	PROC(cancel_res, cancelres, norep, res, void, 1),
	537	PROC(unlock_res, unlockres, norep, res, void, 1),
	538	PROC(granted_res, res, norep, res, void, 1),
	539	/* statd callback */
	540	PROC(sm_notify, reboot, void, reboot, void, 1),
	541	PROC(none, void, void, void, void, 0),
	542	PROC(none, void, void, void, void, 0),
	543	PROC(none, void, void, void, void, 0),
	544	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	545	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	546	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	547	PROC(free_all, notify, void, args, void, 1),
	548
	549	};