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

/*
 * 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/slab.h>
#include <linux/in.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfsd/nfsd.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/share.h>

#define NLMDBG_FACILITY		NLMDBG_CLIENT

/*
 * 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:
	nlm_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, void *argp, void *resp)
{
	dprintk("lockd: NULL          called\n");
	return rpc_success;
}

/*
 * TEST: Check for conflicting lock
 */
static __be32
nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
				         struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;
	__be32 rc = rpc_success;

	dprintk("lockd: 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));

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

static __be32
nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
				         struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;
	__be32 rc = rpc_success;

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

	resp->cookie = argp->cookie;

	/* Obtain client and file */
	if ((resp->status = 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));

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

static __be32
nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
				           struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

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

	resp->cookie = argp->cookie;

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

	/* Obtain client and file */
	if ((resp->status = 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(file, &argp->lock);

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

/*
 * UNLOCK: release a lock
 */
static __be32
nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
				           struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

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

	resp->cookie = argp->cookie;

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

	/* Obtain client and file */
	if ((resp->status = 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(file, &argp->lock);

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

/*
 * GRANTED: A server calls us to tell that a process' lock request
 * was granted
 */
static __be32
nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
				            struct nlm_res  *resp)
{
	resp->cookie = argp->cookie;

	dprintk("lockd: GRANTED       called\n");
	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
	dprintk("lockd: GRANTED       status %d\n", ntohl(resp->status));
	return rpc_success;
}

/*
 * This is the generic lockd callback for async RPC calls
 */
static void 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)
{
	lock_kernel();
	nlm_release_call(data);
	unlock_kernel();
}

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, struct nlm_args *argp,
		__be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res  *))
{
	struct nlm_host	*host;
	struct nlm_rqst	*call;
	__be32 stat;

	host = nlmsvc_lookup_host(rqstp,
				  argp->lock.caller,
				  argp->lock.len);
	if (host == NULL)
		return rpc_system_err;

	call = nlm_alloc_call(host);
	if (call == NULL)
		return rpc_system_err;

	stat = func(rqstp, argp, &call->a_res);
	if (stat != 0) {
		nlm_release_call(call);
		return stat;
	}

	call->a_flags = RPC_TASK_ASYNC;
	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
		return rpc_system_err;
	return rpc_success;
}

static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
					     void	     *resp)
{
	dprintk("lockd: TEST_MSG      called\n");
	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
}

static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
					     void	     *resp)
{
	dprintk("lockd: LOCK_MSG      called\n");
	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
}

static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
					       void	       *resp)
{
	dprintk("lockd: CANCEL_MSG    called\n");
	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
}

static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
                                               void            *resp)
{
	dprintk("lockd: UNLOCK_MSG    called\n");
	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
}

static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
                                                void            *resp)
{
	dprintk("lockd: GRANTED_MSG   called\n");
	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, 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,
				          struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

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

	resp->cookie = argp->cookie;

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

	/* Obtain client and file */
	if ((resp->status = 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));
	nlm_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,
				            struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

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

	resp->cookie = argp->cookie;

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

	/* Obtain client and file */
	if ((resp->status = 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));
	nlm_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,
				            struct nlm_res  *resp)
{
	dprintk("lockd: NM_LOCK       called\n");

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

/*
 * FREE_ALL: Release all locks and shares held by client
 */
static __be32
nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
					     void            *resp)
{
	struct nlm_host	*host;

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

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

/*
 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
 */
static __be32
nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
					      void	        *resp)
{
	dprintk("lockd: SM_NOTIFY     called\n");

	if (!nlm_privileged_requester(rqstp)) {
		char buf[RPC_MAX_ADDRBUFLEN];
		printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
				svc_print_addr(rqstp, buf, sizeof(buf)));
		return rpc_system_err;
	}

	nlm_host_rebooted(argp);
	return rpc_success;
}

/*
 * client sent a GRANTED_RES, let's remove the associated block
 */
static __be32
nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res  *argp,
                                                void            *resp)
{
        if (!nlmsvc_ops)
                return rpc_success;

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

        nlmsvc_grant_reply(&argp->cookie, argp->status);
        return rpc_success;
}


/*
 * NLM Server procedures.
 */

#define 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	= (svc_procfunc) nlm4svc_proc_##name,	\
   .pc_decode	= (kxdrproc_t) nlm4svc_decode_##xargt,	\
   .pc_encode	= (kxdrproc_t) 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) */
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
1da177e4 LT	1	/*
	2	* linux/fs/lockd/svc4proc.c
	3	*
	4	* Lockd server procedures. We don't implement the NLM_*_RES
	5	* procedures because we don't use the async procedures.
	6	*
	7	* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
	8	*/
	9
	10	#include <linux/types.h>
	11	#include <linux/time.h>
	12	#include <linux/slab.h>
	13	#include <linux/in.h>
	14	#include <linux/sunrpc/svc.h>
	15	#include <linux/sunrpc/clnt.h>
	16	#include <linux/nfsd/nfsd.h>
	17	#include <linux/lockd/lockd.h>
	18	#include <linux/lockd/share.h>
1da177e4 LT	19
	20	#define NLMDBG_FACILITY NLMDBG_CLIENT
	21
1da177e4 LT	22	/*
	23	* Obtain client and file from arguments
	24	*/
52921e02	25	static __be32
1da177e4 LT	26	nlm4svc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	27	struct nlm_host hostp, struct nlm_file filp)
	28	{
	29	struct nlm_host *host = NULL;
	30	struct nlm_file *file = NULL;
	31	struct nlm_lock *lock = &argp->lock;
52921e02	32	__be32 error = 0;
1da177e4 LT	33
	34	/* nfsd callbacks must have been installed for this procedure */
	35	if (!nlmsvc_ops)
	36	return nlm_lck_denied_nolocks;
	37
	38	/* Obtain host handle */
db4e4c9a	39	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
977faf39	40	\|\| (argp->monitor && nsm_monitor(host) < 0))
1da177e4 LT	41	goto no_locks;
	42	*hostp = host;
	43
	44	/* Obtain file pointer. Not used by FREE_ALL call. */
	45	if (filp != NULL) {
	46	if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
	47	goto no_locks;
	48	*filp = file;
	49
	50	/* Set up the missing parts of the file_lock structure */
	51	lock->fl.fl_file = file->f_file;
	52	lock->fl.fl_owner = (fl_owner_t) host;
	53	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	54	}
	55
	56	return 0;
	57
	58	no_locks:
b0e92aae	59	nlm_release_host(host);
1da177e4 LT	60	if (error)
	61	return error;
	62	return nlm_lck_denied_nolocks;
	63	}
	64
	65	/*
	66	* NULL: Test for presence of service
	67	*/
7111c66e	68	static __be32
1da177e4 LT	69	nlm4svc_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	70	{
	71	dprintk("lockd: NULL called\n");
	72	return rpc_success;
	73	}
	74
	75	/*
	76	* TEST: Check for conflicting lock
	77	*/
7111c66e	78	static __be32
1da177e4 LT	79	nlm4svc_proc_test(struct svc_rqst rqstp, struct nlm_args argp,
	80	struct nlm_res *resp)
	81	{
	82	struct nlm_host *host;
	83	struct nlm_file *file;
317602f3	84	__be32 rc = rpc_success;
1da177e4 LT	85
	86	dprintk("lockd: TEST4 called\n");
	87	resp->cookie = argp->cookie;
	88
1da177e4 LT	89	/* Obtain client and file */
1da177e4 LT	90	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	91	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	92
1da177e4 LT	93	/* Now check for conflicting locks */
8f920d5e	94	resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
5ea0d750	95	if (resp->status == nlm_drop_reply)
b7e6b869 OD	96	rc = rpc_drop_reply;
	97	else
	98	dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
1da177e4	99
1da177e4 LT	100	nlm_release_host(host);
1da177e4 LT	101	nlm_release_file(file);
b7e6b869	102	return rc;
1da177e4 LT	103	}
1da177e4 LT	104
7111c66e	105	static __be32
1da177e4 LT	106	nlm4svc_proc_lock(struct svc_rqst rqstp, struct nlm_args argp,
	107	struct nlm_res *resp)
	108	{
	109	struct nlm_host *host;
	110	struct nlm_file *file;
317602f3	111	__be32 rc = rpc_success;
1da177e4 LT	112
	113	dprintk("lockd: LOCK called\n");
	114
	115	resp->cookie = argp->cookie;
	116
1da177e4 LT	117	/* Obtain client and file */
1da177e4 LT	118	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	119	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	120
	121	#if 0
	122	/* If supplied state doesn't match current state, we assume it's
	123	* an old request that time-warped somehow. Any error return would
	124	* do in this case because it's irrelevant anyway.
	125	*
	126	* NB: We don't retrieve the remote host's state yet.
	127	*/
	128	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	129	resp->status = nlm_lck_denied_nolocks;
	130	} else
	131	#endif
	132
	133	/* Now try to lock the file */
6cde4de8	134	resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
b2b50289 BF	135	argp->block, &argp->cookie,
b2b50289 BF	136	argp->reclaim);
1a8322b2	137	if (resp->status == nlm_drop_reply)
b7e6b869 OD	138	rc = rpc_drop_reply;
	139	else
	140	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
1da177e4	141
1da177e4 LT	142	nlm_release_host(host);
1da177e4 LT	143	nlm_release_file(file);
b7e6b869	144	return rc;
1da177e4 LT	145	}
1da177e4 LT	146
7111c66e	147	static __be32
1da177e4 LT	148	nlm4svc_proc_cancel(struct svc_rqst rqstp, struct nlm_args argp,
	149	struct nlm_res *resp)
	150	{
	151	struct nlm_host *host;
	152	struct nlm_file *file;
	153
	154	dprintk("lockd: CANCEL called\n");
	155
	156	resp->cookie = argp->cookie;
	157
	158	/* Don't accept requests during grace period */
af558e33	159	if (locks_in_grace()) {
1da177e4 LT	160	resp->status = nlm_lck_denied_grace_period;
	161	return rpc_success;
	162	}
	163
	164	/* Obtain client and file */
	165	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	166	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	167
	168	/* Try to cancel request. */
	169	resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
	170
	171	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
	172	nlm_release_host(host);
	173	nlm_release_file(file);
	174	return rpc_success;
	175	}
	176
	177	/*
	178	* UNLOCK: release a lock
	179	*/
7111c66e	180	static __be32
1da177e4 LT	181	nlm4svc_proc_unlock(struct svc_rqst rqstp, struct nlm_args argp,
	182	struct nlm_res *resp)
	183	{
	184	struct nlm_host *host;
	185	struct nlm_file *file;
	186
	187	dprintk("lockd: UNLOCK called\n");
	188
	189	resp->cookie = argp->cookie;
	190
	191	/* Don't accept new lock requests during grace period */
af558e33	192	if (locks_in_grace()) {
1da177e4 LT	193	resp->status = nlm_lck_denied_grace_period;
	194	return rpc_success;
	195	}
	196
	197	/* Obtain client and file */
	198	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	199	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	200
	201	/* Now try to remove the lock */
	202	resp->status = nlmsvc_unlock(file, &argp->lock);
	203
	204	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
	205	nlm_release_host(host);
	206	nlm_release_file(file);
	207	return rpc_success;
	208	}
	209
	210	/*
	211	* GRANTED: A server calls us to tell that a process' lock request
	212	* was granted
	213	*/
7111c66e	214	static __be32
1da177e4 LT	215	nlm4svc_proc_granted(struct svc_rqst rqstp, struct nlm_args argp,
	216	struct nlm_res *resp)
	217	{
	218	resp->cookie = argp->cookie;
	219
	220	dprintk("lockd: GRANTED called\n");
dcff09f1	221	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
1da177e4 LT	222	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	223	return rpc_success;
	224	}
	225
d4716624 TM	226	/*
	227	* This is the generic lockd callback for async RPC calls
	228	*/
	229	static void nlm4svc_callback_exit(struct rpc_task task, void data)
	230	{
c041b5ff	231	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	232	-task->tk_status);
	233	}
	234
	235	static void nlm4svc_callback_release(void *data)
	236	{
a86dc496	237	lock_kernel();
d4716624	238	nlm_release_call(data);
a86dc496	239	unlock_kernel();
d4716624 TM	240	}
	241
	242	static const struct rpc_call_ops nlm4svc_callback_ops = {
	243	.rpc_call_done = nlm4svc_callback_exit,
	244	.rpc_release = nlm4svc_callback_release,
	245	};
	246
1da177e4 LT	247	/*
	248	* `Async' versions of the above service routines. They aren't really,
	249	* because we send the callback before the reply proper. I hope this
	250	* doesn't break any clients.
	251	*/
7111c66e AV	252	static __be32 nlm4svc_callback(struct svc_rqst rqstp, u32 proc, struct nlm_args argp,
7111c66e AV	253	__be32 (func)(struct svc_rqst , struct nlm_args , struct nlm_res ))
1da177e4	254	{
d4716624 TM	255	struct nlm_host *host;
d4716624 TM	256	struct nlm_rqst *call;
7111c66e	257	__be32 stat;
1da177e4	258
db4e4c9a OK	259	host = nlmsvc_lookup_host(rqstp,
	260	argp->lock.caller,
	261	argp->lock.len);
d4716624 TM	262	if (host == NULL)
	263	return rpc_system_err;
	264
	265	call = nlm_alloc_call(host);
	266	if (call == NULL)
	267	return rpc_system_err;
	268
	269	stat = func(rqstp, argp, &call->a_res);
	270	if (stat != 0) {
	271	nlm_release_call(call);
	272	return stat;
	273	}
1da177e4	274
d4716624 TM	275	call->a_flags = RPC_TASK_ASYNC;
	276	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
	277	return rpc_system_err;
	278	return rpc_success;
1da177e4 LT	279	}
1da177e4 LT	280
7111c66e	281	static __be32 nlm4svc_proc_test_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	282	void *resp)
1da177e4 LT	283	{
d4716624 TM	284	dprintk("lockd: TEST_MSG called\n");
	285	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
	286	}
1da177e4	287
7111c66e	288	static __be32 nlm4svc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
d4716624 TM	289	void *resp)
d4716624 TM	290	{
1da177e4	291	dprintk("lockd: LOCK_MSG called\n");
d4716624	292	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
1da177e4 LT	293	}
1da177e4 LT	294
7111c66e	295	static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	296	void *resp)
1da177e4 LT	297	{
1da177e4	298	dprintk("lockd: CANCEL_MSG called\n");
d4716624	299	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
1da177e4 LT	300	}
1da177e4 LT	301
7111c66e	302	static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	303	void *resp)
1da177e4 LT	304	{
1da177e4	305	dprintk("lockd: UNLOCK_MSG called\n");
d4716624	306	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
1da177e4 LT	307	}
1da177e4 LT	308
7111c66e	309	static __be32 nlm4svc_proc_granted_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	310	void *resp)
1da177e4 LT	311	{
1da177e4	312	dprintk("lockd: GRANTED_MSG called\n");
d4716624	313	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
1da177e4 LT	314	}
	315
	316	/*
	317	* SHARE: create a DOS share or alter existing share.
	318	*/
7111c66e	319	static __be32
1da177e4 LT	320	nlm4svc_proc_share(struct svc_rqst rqstp, struct nlm_args argp,
	321	struct nlm_res *resp)
	322	{
	323	struct nlm_host *host;
	324	struct nlm_file *file;
	325
	326	dprintk("lockd: SHARE called\n");
	327
	328	resp->cookie = argp->cookie;
	329
	330	/* Don't accept new lock requests during grace period */
af558e33	331	if (locks_in_grace() && !argp->reclaim) {
1da177e4 LT	332	resp->status = nlm_lck_denied_grace_period;
	333	return rpc_success;
	334	}
	335
	336	/* Obtain client and file */
	337	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	338	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	339
	340	/* Now try to create the share */
	341	resp->status = nlmsvc_share_file(host, file, argp);
	342
	343	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
	344	nlm_release_host(host);
	345	nlm_release_file(file);
	346	return rpc_success;
	347	}
	348
	349	/*
	350	* UNSHARE: Release a DOS share.
	351	*/
7111c66e	352	static __be32
1da177e4 LT	353	nlm4svc_proc_unshare(struct svc_rqst rqstp, struct nlm_args argp,
	354	struct nlm_res *resp)
	355	{
	356	struct nlm_host *host;
	357	struct nlm_file *file;
	358
	359	dprintk("lockd: UNSHARE called\n");
	360
	361	resp->cookie = argp->cookie;
	362
	363	/* Don't accept requests during grace period */
af558e33	364	if (locks_in_grace()) {
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 lock the file */
	374	resp->status = nlmsvc_unshare_file(host, file, argp);
	375
	376	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
	377	nlm_release_host(host);
	378	nlm_release_file(file);
	379	return rpc_success;
	380	}
	381
	382	/*
	383	* NM_LOCK: Create an unmonitored lock
	384	*/
7111c66e	385	static __be32
1da177e4 LT	386	nlm4svc_proc_nm_lock(struct svc_rqst rqstp, struct nlm_args argp,
	387	struct nlm_res *resp)
	388	{
	389	dprintk("lockd: NM_LOCK called\n");
	390
	391	argp->monitor = 0; /* just clean the monitor flag */
	392	return nlm4svc_proc_lock(rqstp, argp, resp);
	393	}
	394
	395	/*
	396	* FREE_ALL: Release all locks and shares held by client
	397	*/
7111c66e	398	static __be32
1da177e4 LT	399	nlm4svc_proc_free_all(struct svc_rqst rqstp, struct nlm_args argp,
	400	void *resp)
	401	{
	402	struct nlm_host *host;
	403
	404	/* Obtain client */
	405	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
	406	return rpc_success;
	407
	408	nlmsvc_free_host_resources(host);
	409	nlm_release_host(host);
	410	return rpc_success;
	411	}
	412
	413	/*
	414	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	415	*/
7111c66e	416	static __be32
1da177e4 LT	417	nlm4svc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
	418	void *resp)
	419	{
1da177e4	420	dprintk("lockd: SM_NOTIFY called\n");
b85e4676 CL	421
b85e4676 CL	422	if (!nlm_privileged_requester(rqstp)) {
ad06e4bd CL	423	char buf[RPC_MAX_ADDRBUFLEN];
	424	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	425	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	426	return rpc_system_err;
	427	}
	428
7fefc9cb	429	nlm_host_rebooted(argp);
1da177e4 LT	430	return rpc_success;
	431	}
	432
	433	/*
	434	* client sent a GRANTED_RES, let's remove the associated block
	435	*/
7111c66e	436	static __be32
1da177e4 LT	437	nlm4svc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
	438	void *resp)
	439	{
	440	if (!nlmsvc_ops)
	441	return rpc_success;
	442
	443	dprintk("lockd: GRANTED_RES called\n");
	444
39be4502	445	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	446	return rpc_success;
	447	}
	448
	449
1da177e4 LT	450	/*
	451	* NLM Server procedures.
	452	*/
	453
	454	#define nlm4svc_encode_norep nlm4svc_encode_void
	455	#define nlm4svc_decode_norep nlm4svc_decode_void
	456	#define nlm4svc_decode_testres nlm4svc_decode_void
	457	#define nlm4svc_decode_lockres nlm4svc_decode_void
	458	#define nlm4svc_decode_unlockres nlm4svc_decode_void
	459	#define nlm4svc_decode_cancelres nlm4svc_decode_void
	460	#define nlm4svc_decode_grantedres nlm4svc_decode_void
	461
	462	#define nlm4svc_proc_none nlm4svc_proc_null
	463	#define nlm4svc_proc_test_res nlm4svc_proc_null
	464	#define nlm4svc_proc_lock_res nlm4svc_proc_null
	465	#define nlm4svc_proc_cancel_res nlm4svc_proc_null
	466	#define nlm4svc_proc_unlock_res nlm4svc_proc_null
	467
	468	struct nlm_void { int dummy; };
	469
	470	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	471	{ .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
	472	.pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
	473	.pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
	474	.pc_release = NULL, \
	475	.pc_argsize = sizeof(struct nlm_##argt), \
	476	.pc_ressize = sizeof(struct nlm_##rest), \
	477	.pc_xdrressize = respsize, \
	478	}
	479	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	480	#define No (1+1024/4) /* netobj */
	481	#define St 1 /* status */
	482	#define Rg 4 /* range (offset + length) */
	483	struct svc_procedure nlmsvc_procedures4[] = {
	484	PROC(null, void, void, void, void, 1),
	485	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	486	PROC(lock, lockargs, res, args, res, Ck+St),
	487	PROC(cancel, cancargs, res, args, res, Ck+St),
	488	PROC(unlock, unlockargs, res, args, res, Ck+St),
	489	PROC(granted, testargs, res, args, res, Ck+St),
	490	PROC(test_msg, testargs, norep, args, void, 1),
	491	PROC(lock_msg, lockargs, norep, args, void, 1),
	492	PROC(cancel_msg, cancargs, norep, args, void, 1),
	493	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	494	PROC(granted_msg, testargs, norep, args, void, 1),
	495	PROC(test_res, testres, norep, res, void, 1),
	496	PROC(lock_res, lockres, norep, res, void, 1),
	497	PROC(cancel_res, cancelres, norep, res, void, 1),
	498	PROC(unlock_res, unlockres, norep, res, void, 1),
	499	PROC(granted_res, res, norep, res, void, 1),
	500	/* statd callback */
	501	PROC(sm_notify, reboot, void, reboot, void, 1),
	502	PROC(none, void, void, void, void, 0),
	503	PROC(none, void, void, void, void, 0),
	504	PROC(none, void, void, void, void, 0),
	505	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	506	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	507	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	508	PROC(free_all, notify, void, args, void, 1),
	509
	510	};