[linux-2.6-block.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 <okir@monad.swb.de>
 */

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

#define NLMDBG_FACILITY		NLMDBG_CLIENT

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

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

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

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

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

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

		/* Set up the missing parts of the file_lock structure */
		lock->fl.fl_file  = file->f_file;
		lock->fl.fl_pid = current->tgid;
		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
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_lockowner(&argp->lock);
	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_lockowner(&argp->lock);
	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_lockowner(&argp->lock);
	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_lockowner(&argp->lock);
	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_lockowner(&argp->lock);
	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_lockowner(&argp->lock);
	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 <okir@monad.swb.de>
	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;
646d73e9	79	lock->fl.fl_pid = current->tgid;
1da177e4	80	lock->fl.fl_lmops = &nlmsvc_lock_operations;
89e0edfb BC	81	nlmsvc_locks_init_private(&lock->fl, host, (pid_t)lock->svid);
	82	if (!lock->fl.fl_owner) {
	83	/* lockowner allocation has failed */
	84	nlmsvc_release_host(host);
	85	return nlm_lck_denied_nolocks;
	86	}
1da177e4 LT	87	}
	88
	89	return 0;
	90
	91	no_locks:
67216b94	92	nlmsvc_release_host(host);
d343fce1 N	93	if (error)
d343fce1 N	94	return error;
1da177e4 LT	95	return nlm_lck_denied_nolocks;
	96	}
	97
	98	/*
	99	* NULL: Test for presence of service
	100	*/
7111c66e	101	static __be32
a6beb732	102	nlmsvc_proc_null(struct svc_rqst *rqstp)
1da177e4 LT	103	{
	104	dprintk("lockd: NULL called\n");
	105	return rpc_success;
	106	}
	107
	108	/*
	109	* TEST: Check for conflicting lock
	110	*/
7111c66e	111	static __be32
a6beb732	112	__nlmsvc_proc_test(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	113	{
a6beb732	114	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	115	struct nlm_host *host;
1da177e4 LT	116	struct nlm_file *file;
317602f3	117	__be32 rc = rpc_success;
1da177e4 LT	118
	119	dprintk("lockd: TEST called\n");
	120	resp->cookie = argp->cookie;
	121
1da177e4 LT	122	/* Obtain client and file */
1da177e4 LT	123	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	124	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	125
1da177e4 LT	126	/* Now check for conflicting locks */
8f920d5e	127	resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie));
5ea0d750	128	if (resp->status == nlm_drop_reply)
b7e6b869 OD	129	rc = rpc_drop_reply;
	130	else
	131	dprintk("lockd: TEST status %d vers %d\n",
	132	ntohl(resp->status), rqstp->rq_vers);
1da177e4	133
89e0edfb	134	nlmsvc_release_lockowner(&argp->lock);
67216b94	135	nlmsvc_release_host(host);
1da177e4	136	nlm_release_file(file);
b7e6b869	137	return rc;
1da177e4 LT	138	}
1da177e4 LT	139
7111c66e	140	static __be32
a6beb732	141	nlmsvc_proc_test(struct svc_rqst *rqstp)
1da177e4	142	{
a6beb732 CH	143	return __nlmsvc_proc_test(rqstp, rqstp->rq_resp);
	144	}
	145
	146	static __be32
	147	__nlmsvc_proc_lock(struct svc_rqst rqstp, struct nlm_res resp)
	148	{
	149	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	150	struct nlm_host *host;
1da177e4 LT	151	struct nlm_file *file;
317602f3	152	__be32 rc = rpc_success;
1da177e4 LT	153
	154	dprintk("lockd: LOCK called\n");
	155
	156	resp->cookie = argp->cookie;
	157
1da177e4 LT	158	/* Obtain client and file */
1da177e4 LT	159	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	160	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	161
	162	#if 0
	163	/* If supplied state doesn't match current state, we assume it's
	164	* an old request that time-warped somehow. Any error return would
	165	* do in this case because it's irrelevant anyway.
	166	*
	167	* NB: We don't retrieve the remote host's state yet.
	168	*/
	169	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	170	resp->status = nlm_lck_denied_nolocks;
	171	} else
	172	#endif
	173
	174	/* Now try to lock the file */
6cde4de8	175	resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock,
b2b50289 BF	176	argp->block, &argp->cookie,
b2b50289 BF	177	argp->reclaim));
1a8322b2	178	if (resp->status == nlm_drop_reply)
b7e6b869 OD	179	rc = rpc_drop_reply;
	180	else
	181	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
1da177e4	182
89e0edfb	183	nlmsvc_release_lockowner(&argp->lock);
67216b94	184	nlmsvc_release_host(host);
1da177e4	185	nlm_release_file(file);
b7e6b869	186	return rc;
1da177e4 LT	187	}
1da177e4 LT	188
7111c66e	189	static __be32
a6beb732 CH	190	nlmsvc_proc_lock(struct svc_rqst *rqstp)
	191	{
	192	return __nlmsvc_proc_lock(rqstp, rqstp->rq_resp);
	193	}
	194
	195	static __be32
	196	__nlmsvc_proc_cancel(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;
1da177e4 LT	200	struct nlm_file *file;
5ccb0066	201	struct net *net = SVC_NET(rqstp);
1da177e4 LT	202
	203	dprintk("lockd: CANCEL called\n");
	204
	205	resp->cookie = argp->cookie;
	206
	207	/* Don't accept requests during grace period */
5ccb0066	208	if (locks_in_grace(net)) {
1da177e4 LT	209	resp->status = nlm_lck_denied_grace_period;
	210	return rpc_success;
	211	}
	212
	213	/* Obtain client and file */
	214	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	215	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	216
1da177e4 LT	217	/* Try to cancel request. */
5ccb0066	218	resp->status = cast_status(nlmsvc_cancel_blocked(net, file, &argp->lock));
1da177e4 LT	219
1da177e4 LT	220	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
89e0edfb	221	nlmsvc_release_lockowner(&argp->lock);
67216b94	222	nlmsvc_release_host(host);
1da177e4 LT	223	nlm_release_file(file);
	224	return rpc_success;
	225	}
	226
a6beb732 CH	227	static __be32
	228	nlmsvc_proc_cancel(struct svc_rqst *rqstp)
	229	{
	230	return __nlmsvc_proc_cancel(rqstp, rqstp->rq_resp);
	231	}
	232
1da177e4 LT	233	/*
	234	* UNLOCK: release a lock
	235	*/
7111c66e	236	static __be32
a6beb732	237	__nlmsvc_proc_unlock(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	238	{
a6beb732	239	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	240	struct nlm_host *host;
1da177e4 LT	241	struct nlm_file *file;
5ccb0066	242	struct net *net = SVC_NET(rqstp);
1da177e4 LT	243
	244	dprintk("lockd: UNLOCK called\n");
	245
	246	resp->cookie = argp->cookie;
	247
	248	/* Don't accept new lock requests during grace period */
5ccb0066	249	if (locks_in_grace(net)) {
1da177e4 LT	250	resp->status = nlm_lck_denied_grace_period;
	251	return rpc_success;
	252	}
	253
	254	/* Obtain client and file */
	255	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	256	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	257
1da177e4 LT	258	/* Now try to remove the lock */
5ccb0066	259	resp->status = cast_status(nlmsvc_unlock(net, file, &argp->lock));
1da177e4 LT	260
1da177e4 LT	261	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
89e0edfb	262	nlmsvc_release_lockowner(&argp->lock);
67216b94	263	nlmsvc_release_host(host);
1da177e4 LT	264	nlm_release_file(file);
	265	return rpc_success;
	266	}
	267
a6beb732 CH	268	static __be32
	269	nlmsvc_proc_unlock(struct svc_rqst *rqstp)
	270	{
	271	return __nlmsvc_proc_unlock(rqstp, rqstp->rq_resp);
	272	}
	273
1da177e4 LT	274	/*
	275	* GRANTED: A server calls us to tell that a process' lock request
	276	* was granted
	277	*/
7111c66e	278	static __be32
a6beb732	279	__nlmsvc_proc_granted(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	280	{
a6beb732 CH	281	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	282
1da177e4 LT	283	resp->cookie = argp->cookie;
	284
	285	dprintk("lockd: GRANTED called\n");
dcff09f1	286	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
1da177e4 LT	287	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	288	return rpc_success;
	289	}
	290
a6beb732 CH	291	static __be32
	292	nlmsvc_proc_granted(struct svc_rqst *rqstp)
	293	{
	294	return __nlmsvc_proc_granted(rqstp, rqstp->rq_resp);
	295	}
	296
d4716624 TM	297	/*
	298	* This is the generic lockd callback for async RPC calls
	299	*/
	300	static void nlmsvc_callback_exit(struct rpc_task task, void data)
	301	{
c041b5ff	302	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	303	-task->tk_status);
	304	}
	305
7db836d4 CL	306	void nlmsvc_release_call(struct nlm_rqst *call)
7db836d4 CL	307	{
fbca30c5	308	if (!refcount_dec_and_test(&call->a_count))
7db836d4	309	return;
67216b94	310	nlmsvc_release_host(call->a_host);
7db836d4 CL	311	kfree(call);
	312	}
	313
d4716624 TM	314	static void nlmsvc_callback_release(void *data)
d4716624 TM	315	{
7db836d4	316	nlmsvc_release_call(data);
d4716624 TM	317	}
	318
	319	static const struct rpc_call_ops nlmsvc_callback_ops = {
	320	.rpc_call_done = nlmsvc_callback_exit,
	321	.rpc_release = nlmsvc_callback_release,
	322	};
	323
1da177e4 LT	324	/*
	325	* `Async' versions of the above service routines. They aren't really,
	326	* because we send the callback before the reply proper. I hope this
	327	* doesn't break any clients.
	328	*/
a6beb732 CH	329	static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc,
a6beb732 CH	330	__be32 (func)(struct svc_rqst , struct nlm_res *))
1da177e4	331	{
a6beb732	332	struct nlm_args *argp = rqstp->rq_argp;
d4716624 TM	333	struct nlm_host *host;
d4716624 TM	334	struct nlm_rqst *call;
7111c66e	335	__be32 stat;
1da177e4	336
db4e4c9a OK	337	host = nlmsvc_lookup_host(rqstp,
	338	argp->lock.caller,
	339	argp->lock.len);
d4716624 TM	340	if (host == NULL)
	341	return rpc_system_err;
	342
	343	call = nlm_alloc_call(host);
446945ab	344	nlmsvc_release_host(host);
d4716624 TM	345	if (call == NULL)
	346	return rpc_system_err;
	347
a6beb732	348	stat = func(rqstp, &call->a_res);
d4716624	349	if (stat != 0) {
7db836d4	350	nlmsvc_release_call(call);
d4716624 TM	351	return stat;
d4716624 TM	352	}
1da177e4	353
d4716624 TM	354	call->a_flags = RPC_TASK_ASYNC;
	355	if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
	356	return rpc_system_err;
	357	return rpc_success;
1da177e4 LT	358	}
1da177e4 LT	359
a6beb732	360	static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp)
1da177e4	361	{
d4716624	362	dprintk("lockd: TEST_MSG called\n");
a6beb732	363	return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, __nlmsvc_proc_test);
d4716624	364	}
1da177e4	365
a6beb732	366	static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp)
d4716624	367	{
1da177e4	368	dprintk("lockd: LOCK_MSG called\n");
a6beb732	369	return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, __nlmsvc_proc_lock);
1da177e4 LT	370	}
1da177e4 LT	371
a6beb732	372	static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp)
1da177e4	373	{
1da177e4	374	dprintk("lockd: CANCEL_MSG called\n");
a6beb732	375	return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, __nlmsvc_proc_cancel);
1da177e4 LT	376	}
1da177e4 LT	377
7111c66e	378	static __be32
a6beb732	379	nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp)
1da177e4	380	{
1da177e4	381	dprintk("lockd: UNLOCK_MSG called\n");
a6beb732	382	return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlmsvc_proc_unlock);
1da177e4 LT	383	}
1da177e4 LT	384
7111c66e	385	static __be32
a6beb732	386	nlmsvc_proc_granted_msg(struct svc_rqst *rqstp)
1da177e4	387	{
1da177e4	388	dprintk("lockd: GRANTED_MSG called\n");
a6beb732	389	return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, __nlmsvc_proc_granted);
1da177e4 LT	390	}
	391
	392	/*
	393	* SHARE: create a DOS share or alter existing share.
	394	*/
7111c66e	395	static __be32
a6beb732	396	nlmsvc_proc_share(struct svc_rqst *rqstp)
1da177e4	397	{
a6beb732 CH	398	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	399	struct nlm_res *resp = rqstp->rq_resp;
1da177e4 LT	400	struct nlm_host *host;
	401	struct nlm_file *file;
	402
	403	dprintk("lockd: SHARE called\n");
	404
	405	resp->cookie = argp->cookie;
	406
	407	/* Don't accept new lock requests during grace period */
5ccb0066	408	if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
1da177e4 LT	409	resp->status = nlm_lck_denied_grace_period;
	410	return rpc_success;
	411	}
	412
	413	/* Obtain client and file */
	414	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	415	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	416
	417	/* Now try to create the share */
	418	resp->status = cast_status(nlmsvc_share_file(host, file, argp));
	419
	420	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
89e0edfb	421	nlmsvc_release_lockowner(&argp->lock);
67216b94	422	nlmsvc_release_host(host);
1da177e4 LT	423	nlm_release_file(file);
	424	return rpc_success;
	425	}
	426
	427	/*
	428	* UNSHARE: Release a DOS share.
	429	*/
7111c66e	430	static __be32
a6beb732	431	nlmsvc_proc_unshare(struct svc_rqst *rqstp)
1da177e4	432	{
a6beb732 CH	433	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	434	struct nlm_res *resp = rqstp->rq_resp;
1da177e4 LT	435	struct nlm_host *host;
	436	struct nlm_file *file;
	437
	438	dprintk("lockd: UNSHARE called\n");
	439
	440	resp->cookie = argp->cookie;
	441
	442	/* Don't accept requests during grace period */
5ccb0066	443	if (locks_in_grace(SVC_NET(rqstp))) {
1da177e4 LT	444	resp->status = nlm_lck_denied_grace_period;
	445	return rpc_success;
	446	}
	447
	448	/* Obtain client and file */
	449	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	450	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	451
	452	/* Now try to unshare the file */
	453	resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
	454
	455	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
89e0edfb	456	nlmsvc_release_lockowner(&argp->lock);
67216b94	457	nlmsvc_release_host(host);
1da177e4 LT	458	nlm_release_file(file);
	459	return rpc_success;
	460	}
	461
	462	/*
	463	* NM_LOCK: Create an unmonitored lock
	464	*/
7111c66e	465	static __be32
a6beb732	466	nlmsvc_proc_nm_lock(struct svc_rqst *rqstp)
1da177e4	467	{
a6beb732 CH	468	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	469
1da177e4 LT	470	dprintk("lockd: NM_LOCK called\n");
	471
	472	argp->monitor = 0; /* just clean the monitor flag */
a6beb732	473	return nlmsvc_proc_lock(rqstp);
1da177e4 LT	474	}
	475
	476	/*
	477	* FREE_ALL: Release all locks and shares held by client
	478	*/
7111c66e	479	static __be32
a6beb732	480	nlmsvc_proc_free_all(struct svc_rqst *rqstp)
1da177e4	481	{
a6beb732	482	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	483	struct nlm_host *host;
	484
	485	/* Obtain client */
	486	if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
	487	return rpc_success;
	488
	489	nlmsvc_free_host_resources(host);
67216b94	490	nlmsvc_release_host(host);
1da177e4 LT	491	return rpc_success;
	492	}
	493
	494	/*
	495	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	496	*/
7111c66e	497	static __be32
a6beb732	498	nlmsvc_proc_sm_notify(struct svc_rqst *rqstp)
1da177e4	499	{
a6beb732 CH	500	struct nlm_reboot *argp = rqstp->rq_argp;
a6beb732 CH	501
1da177e4	502	dprintk("lockd: SM_NOTIFY called\n");
b85e4676 CL	503
b85e4676 CL	504	if (!nlm_privileged_requester(rqstp)) {
ad06e4bd CL	505	char buf[RPC_MAX_ADDRBUFLEN];
	506	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	507	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	508	return rpc_system_err;
	509	}
	510
0ad95472	511	nlm_host_rebooted(SVC_NET(rqstp), argp);
1da177e4 LT	512	return rpc_success;
	513	}
	514
	515	/*
	516	* client sent a GRANTED_RES, let's remove the associated block
	517	*/
7111c66e	518	static __be32
a6beb732	519	nlmsvc_proc_granted_res(struct svc_rqst *rqstp)
1da177e4	520	{
a6beb732 CH	521	struct nlm_res *argp = rqstp->rq_argp;
a6beb732 CH	522
1da177e4 LT	523	if (!nlmsvc_ops)
	524	return rpc_success;
	525
	526	dprintk("lockd: GRANTED_RES called\n");
	527
39be4502	528	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	529	return rpc_success;
	530	}
	531
1da177e4 LT	532	/*
	533	* NLM Server procedures.
	534	*/
	535
	536	#define nlmsvc_encode_norep nlmsvc_encode_void
	537	#define nlmsvc_decode_norep nlmsvc_decode_void
	538	#define nlmsvc_decode_testres nlmsvc_decode_void
	539	#define nlmsvc_decode_lockres nlmsvc_decode_void
	540	#define nlmsvc_decode_unlockres nlmsvc_decode_void
	541	#define nlmsvc_decode_cancelres nlmsvc_decode_void
	542	#define nlmsvc_decode_grantedres nlmsvc_decode_void
	543
	544	#define nlmsvc_proc_none nlmsvc_proc_null
	545	#define nlmsvc_proc_test_res nlmsvc_proc_null
	546	#define nlmsvc_proc_lock_res nlmsvc_proc_null
	547	#define nlmsvc_proc_cancel_res nlmsvc_proc_null
	548	#define nlmsvc_proc_unlock_res nlmsvc_proc_null
	549
	550	struct nlm_void { int dummy; };
	551
	552	#define PROC(name, xargt, xrest, argt, rest, respsize) \
a6beb732	553	{ .pc_func = nlmsvc_proc_##name, \
026fec7e	554	.pc_decode = nlmsvc_decode_##xargt, \
63f8de37	555	.pc_encode = nlmsvc_encode_##xrest, \
1da177e4 LT	556	.pc_release = NULL, \
	557	.pc_argsize = sizeof(struct nlm_##argt), \
	558	.pc_ressize = sizeof(struct nlm_##rest), \
	559	.pc_xdrressize = respsize, \
	560	}
	561
	562	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	563	#define St 1 /* status */
	564	#define No (1+1024/4) /* Net Obj */
	565	#define Rg 2 /* range - offset + size */
	566
860bda29	567	const struct svc_procedure nlmsvc_procedures[] = {
1da177e4 LT	568	PROC(null, void, void, void, void, 1),
	569	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	570	PROC(lock, lockargs, res, args, res, Ck+St),
	571	PROC(cancel, cancargs, res, args, res, Ck+St),
	572	PROC(unlock, unlockargs, res, args, res, Ck+St),
	573	PROC(granted, testargs, res, args, res, Ck+St),
	574	PROC(test_msg, testargs, norep, args, void, 1),
	575	PROC(lock_msg, lockargs, norep, args, void, 1),
	576	PROC(cancel_msg, cancargs, norep, args, void, 1),
	577	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	578	PROC(granted_msg, testargs, norep, args, void, 1),
	579	PROC(test_res, testres, norep, res, void, 1),
	580	PROC(lock_res, lockres, norep, res, void, 1),
	581	PROC(cancel_res, cancelres, norep, res, void, 1),
	582	PROC(unlock_res, unlockres, norep, res, void, 1),
	583	PROC(granted_res, res, norep, res, void, 1),
	584	/* statd callback */
	585	PROC(sm_notify, reboot, void, reboot, void, 1),
	586	PROC(none, void, void, void, void, 1),
	587	PROC(none, void, void, void, void, 1),
	588	PROC(none, void, void, void, void, 1),
	589	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	590	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	591	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	592	PROC(free_all, notify, void, args, void, 0),
	593
	594	};