[deliverable/linux.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>
#include <linux/lockd/sm_inter.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:
	if (host)
		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;

	dprintk("lockd: TEST4        called\n");
	resp->cookie = argp->cookie;

	/* Don't accept test requests during grace period */
	if (nlmsvc_grace_period) {
		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 check for conflicting locks */
	resp->status = nlmsvc_testlock(rqstp, file, &argp->lock, &resp->lock, &resp->cookie);
	if (resp->status == nlm_drop_reply)
		return rpc_drop_reply;

	dprintk("lockd: TEST4          status %d\n", ntohl(resp->status));
	nlm_release_host(host);
	nlm_release_file(file);
	return rpc_success;
}

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;

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

	resp->cookie = argp->cookie;

	/* Don't accept new lock requests during grace period */
	if (nlmsvc_grace_period && !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;

#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, &argp->lock,
					argp->block, &argp->cookie);
	if (resp->status == nlm_drop_reply)
		return rpc_drop_reply;

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

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 (nlmsvc_grace_period) {
		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 (nlmsvc_grace_period) {
		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_in(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)
{
	nlm_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, 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 (nlmsvc_grace_period && !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 (nlmsvc_grace_period) {
		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)
{
	struct sockaddr_in	saddr;

	memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr));

	dprintk("lockd: SM_NOTIFY     called\n");
	if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
	 || ntohs(saddr.sin_port) >= 1024) {
		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;
	}

	/* Obtain the host pointer for this NFS server and try to
	 * reclaim all locks we hold on this server.
	 */
	memset(&saddr, 0, sizeof(saddr));
	saddr.sin_addr.s_addr = argp->addr;
	nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state);

	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>
	19	#include <linux/lockd/sm_inter.h>
	20
	21
	22	#define NLMDBG_FACILITY NLMDBG_CLIENT
	23
1da177e4 LT	24	/*
	25	* Obtain client and file from arguments
	26	*/
52921e02	27	static __be32
1da177e4 LT	28	nlm4svc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	29	struct nlm_host hostp, struct nlm_file filp)
	30	{
	31	struct nlm_host *host = NULL;
	32	struct nlm_file *file = NULL;
	33	struct nlm_lock *lock = &argp->lock;
52921e02	34	__be32 error = 0;
1da177e4 LT	35
	36	/* nfsd callbacks must have been installed for this procedure */
	37	if (!nlmsvc_ops)
	38	return nlm_lck_denied_nolocks;
	39
	40	/* Obtain host handle */
db4e4c9a	41	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
977faf39	42	\|\| (argp->monitor && nsm_monitor(host) < 0))
1da177e4 LT	43	goto no_locks;
	44	*hostp = host;
	45
	46	/* Obtain file pointer. Not used by FREE_ALL call. */
	47	if (filp != NULL) {
	48	if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
	49	goto no_locks;
	50	*filp = file;
	51
	52	/* Set up the missing parts of the file_lock structure */
	53	lock->fl.fl_file = file->f_file;
	54	lock->fl.fl_owner = (fl_owner_t) host;
	55	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	56	}
	57
	58	return 0;
	59
	60	no_locks:
	61	if (host)
	62	nlm_release_host(host);
	63	if (error)
	64	return error;
	65	return nlm_lck_denied_nolocks;
	66	}
	67
	68	/*
	69	* NULL: Test for presence of service
	70	*/
7111c66e	71	static __be32
1da177e4 LT	72	nlm4svc_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	73	{
	74	dprintk("lockd: NULL called\n");
	75	return rpc_success;
	76	}
	77
	78	/*
	79	* TEST: Check for conflicting lock
	80	*/
7111c66e	81	static __be32
1da177e4 LT	82	nlm4svc_proc_test(struct svc_rqst rqstp, struct nlm_args argp,
	83	struct nlm_res *resp)
	84	{
	85	struct nlm_host *host;
	86	struct nlm_file *file;
	87
	88	dprintk("lockd: TEST4 called\n");
	89	resp->cookie = argp->cookie;
	90
	91	/* Don't accept test requests during grace period */
	92	if (nlmsvc_grace_period) {
	93	resp->status = nlm_lck_denied_grace_period;
	94	return rpc_success;
	95	}
	96
	97	/* Obtain client and file */
	98	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	99	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	100
1da177e4 LT	101	/* Now check for conflicting locks */
85f3f1b3	102	resp->status = nlmsvc_testlock(rqstp, file, &argp->lock, &resp->lock, &resp->cookie);
5ea0d750 ME	103	if (resp->status == nlm_drop_reply)
5ea0d750 ME	104	return rpc_drop_reply;
1da177e4 LT	105
	106	dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
	107	nlm_release_host(host);
	108	nlm_release_file(file);
	109	return rpc_success;
	110	}
	111
7111c66e	112	static __be32
1da177e4 LT	113	nlm4svc_proc_lock(struct svc_rqst rqstp, struct nlm_args argp,
	114	struct nlm_res *resp)
	115	{
	116	struct nlm_host *host;
	117	struct nlm_file *file;
	118
	119	dprintk("lockd: LOCK called\n");
	120
	121	resp->cookie = argp->cookie;
	122
	123	/* Don't accept new lock requests during grace period */
	124	if (nlmsvc_grace_period && !argp->reclaim) {
	125	resp->status = nlm_lck_denied_grace_period;
	126	return rpc_success;
	127	}
	128
	129	/* Obtain client and file */
	130	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	131	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	132
	133	#if 0
	134	/* If supplied state doesn't match current state, we assume it's
	135	* an old request that time-warped somehow. Any error return would
	136	* do in this case because it's irrelevant anyway.
	137	*
	138	* NB: We don't retrieve the remote host's state yet.
	139	*/
	140	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	141	resp->status = nlm_lck_denied_nolocks;
	142	} else
	143	#endif
	144
	145	/* Now try to lock the file */
	146	resp->status = nlmsvc_lock(rqstp, file, &argp->lock,
	147	argp->block, &argp->cookie);
1a8322b2 ME	148	if (resp->status == nlm_drop_reply)
1a8322b2 ME	149	return rpc_drop_reply;
1da177e4 LT	150
	151	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
	152	nlm_release_host(host);
	153	nlm_release_file(file);
	154	return rpc_success;
	155	}
	156
7111c66e	157	static __be32
1da177e4 LT	158	nlm4svc_proc_cancel(struct svc_rqst rqstp, struct nlm_args argp,
	159	struct nlm_res *resp)
	160	{
	161	struct nlm_host *host;
	162	struct nlm_file *file;
	163
	164	dprintk("lockd: CANCEL called\n");
	165
	166	resp->cookie = argp->cookie;
	167
	168	/* Don't accept requests during grace period */
	169	if (nlmsvc_grace_period) {
	170	resp->status = nlm_lck_denied_grace_period;
	171	return rpc_success;
	172	}
	173
	174	/* Obtain client and file */
	175	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	176	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	177
	178	/* Try to cancel request. */
	179	resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
	180
	181	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
	182	nlm_release_host(host);
	183	nlm_release_file(file);
	184	return rpc_success;
	185	}
	186
	187	/*
	188	* UNLOCK: release a lock
	189	*/
7111c66e	190	static __be32
1da177e4 LT	191	nlm4svc_proc_unlock(struct svc_rqst rqstp, struct nlm_args argp,
	192	struct nlm_res *resp)
	193	{
	194	struct nlm_host *host;
	195	struct nlm_file *file;
	196
	197	dprintk("lockd: UNLOCK called\n");
	198
	199	resp->cookie = argp->cookie;
	200
	201	/* Don't accept new lock requests during grace period */
	202	if (nlmsvc_grace_period) {
	203	resp->status = nlm_lck_denied_grace_period;
	204	return rpc_success;
	205	}
	206
	207	/* Obtain client and file */
	208	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	209	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	210
	211	/* Now try to remove the lock */
	212	resp->status = nlmsvc_unlock(file, &argp->lock);
	213
	214	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
	215	nlm_release_host(host);
	216	nlm_release_file(file);
	217	return rpc_success;
	218	}
	219
	220	/*
	221	* GRANTED: A server calls us to tell that a process' lock request
	222	* was granted
	223	*/
7111c66e	224	static __be32
1da177e4 LT	225	nlm4svc_proc_granted(struct svc_rqst rqstp, struct nlm_args argp,
	226	struct nlm_res *resp)
	227	{
	228	resp->cookie = argp->cookie;
	229
	230	dprintk("lockd: GRANTED called\n");
27459f09	231	resp->status = nlmclnt_grant(svc_addr_in(rqstp), &argp->lock);
1da177e4 LT	232	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	233	return rpc_success;
	234	}
	235
d4716624 TM	236	/*
	237	* This is the generic lockd callback for async RPC calls
	238	*/
	239	static void nlm4svc_callback_exit(struct rpc_task task, void data)
	240	{
c041b5ff	241	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	242	-task->tk_status);
	243	}
	244
	245	static void nlm4svc_callback_release(void *data)
	246	{
	247	nlm_release_call(data);
	248	}
	249
	250	static const struct rpc_call_ops nlm4svc_callback_ops = {
	251	.rpc_call_done = nlm4svc_callback_exit,
	252	.rpc_release = nlm4svc_callback_release,
	253	};
	254
1da177e4 LT	255	/*
	256	* `Async' versions of the above service routines. They aren't really,
	257	* because we send the callback before the reply proper. I hope this
	258	* doesn't break any clients.
	259	*/
7111c66e AV	260	static __be32 nlm4svc_callback(struct svc_rqst rqstp, u32 proc, struct nlm_args argp,
7111c66e AV	261	__be32 (func)(struct svc_rqst , struct nlm_args , struct nlm_res ))
1da177e4	262	{
d4716624 TM	263	struct nlm_host *host;
d4716624 TM	264	struct nlm_rqst *call;
7111c66e	265	__be32 stat;
1da177e4	266
db4e4c9a OK	267	host = nlmsvc_lookup_host(rqstp,
	268	argp->lock.caller,
	269	argp->lock.len);
d4716624 TM	270	if (host == NULL)
	271	return rpc_system_err;
	272
	273	call = nlm_alloc_call(host);
	274	if (call == NULL)
	275	return rpc_system_err;
	276
	277	stat = func(rqstp, argp, &call->a_res);
	278	if (stat != 0) {
	279	nlm_release_call(call);
	280	return stat;
	281	}
1da177e4	282
d4716624 TM	283	call->a_flags = RPC_TASK_ASYNC;
	284	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
	285	return rpc_system_err;
	286	return rpc_success;
1da177e4 LT	287	}
1da177e4 LT	288
7111c66e	289	static __be32 nlm4svc_proc_test_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	290	void *resp)
1da177e4 LT	291	{
d4716624 TM	292	dprintk("lockd: TEST_MSG called\n");
	293	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
	294	}
1da177e4	295
7111c66e	296	static __be32 nlm4svc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
d4716624 TM	297	void *resp)
d4716624 TM	298	{
1da177e4	299	dprintk("lockd: LOCK_MSG called\n");
d4716624	300	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
1da177e4 LT	301	}
1da177e4 LT	302
7111c66e	303	static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	304	void *resp)
1da177e4 LT	305	{
1da177e4	306	dprintk("lockd: CANCEL_MSG called\n");
d4716624	307	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
1da177e4 LT	308	}
1da177e4 LT	309
7111c66e	310	static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	311	void *resp)
1da177e4 LT	312	{
1da177e4	313	dprintk("lockd: UNLOCK_MSG called\n");
d4716624	314	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
1da177e4 LT	315	}
1da177e4 LT	316
7111c66e	317	static __be32 nlm4svc_proc_granted_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	318	void *resp)
1da177e4 LT	319	{
1da177e4	320	dprintk("lockd: GRANTED_MSG called\n");
d4716624	321	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
1da177e4 LT	322	}
	323
	324	/*
	325	* SHARE: create a DOS share or alter existing share.
	326	*/
7111c66e	327	static __be32
1da177e4 LT	328	nlm4svc_proc_share(struct svc_rqst rqstp, struct nlm_args argp,
	329	struct nlm_res *resp)
	330	{
	331	struct nlm_host *host;
	332	struct nlm_file *file;
	333
	334	dprintk("lockd: SHARE called\n");
	335
	336	resp->cookie = argp->cookie;
	337
	338	/* Don't accept new lock requests during grace period */
	339	if (nlmsvc_grace_period && !argp->reclaim) {
	340	resp->status = nlm_lck_denied_grace_period;
	341	return rpc_success;
	342	}
	343
	344	/* Obtain client and file */
	345	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	346	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	347
	348	/* Now try to create the share */
	349	resp->status = nlmsvc_share_file(host, file, argp);
	350
	351	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
	352	nlm_release_host(host);
	353	nlm_release_file(file);
	354	return rpc_success;
	355	}
	356
	357	/*
	358	* UNSHARE: Release a DOS share.
	359	*/
7111c66e	360	static __be32
1da177e4 LT	361	nlm4svc_proc_unshare(struct svc_rqst rqstp, struct nlm_args argp,
	362	struct nlm_res *resp)
	363	{
	364	struct nlm_host *host;
	365	struct nlm_file *file;
	366
	367	dprintk("lockd: UNSHARE called\n");
	368
	369	resp->cookie = argp->cookie;
	370
	371	/* Don't accept requests during grace period */
	372	if (nlmsvc_grace_period) {
	373	resp->status = nlm_lck_denied_grace_period;
	374	return rpc_success;
	375	}
	376
	377	/* Obtain client and file */
	378	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	379	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	380
	381	/* Now try to lock the file */
	382	resp->status = nlmsvc_unshare_file(host, file, argp);
	383
	384	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
	385	nlm_release_host(host);
	386	nlm_release_file(file);
	387	return rpc_success;
	388	}
	389
	390	/*
	391	* NM_LOCK: Create an unmonitored lock
	392	*/
7111c66e	393	static __be32
1da177e4 LT	394	nlm4svc_proc_nm_lock(struct svc_rqst rqstp, struct nlm_args argp,
	395	struct nlm_res *resp)
	396	{
	397	dprintk("lockd: NM_LOCK called\n");
	398
	399	argp->monitor = 0; /* just clean the monitor flag */
	400	return nlm4svc_proc_lock(rqstp, argp, resp);
	401	}
	402
	403	/*
	404	* FREE_ALL: Release all locks and shares held by client
	405	*/
7111c66e	406	static __be32
1da177e4 LT	407	nlm4svc_proc_free_all(struct svc_rqst rqstp, struct nlm_args argp,
	408	void *resp)
	409	{
	410	struct nlm_host *host;
	411
	412	/* Obtain client */
	413	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
	414	return rpc_success;
	415
	416	nlmsvc_free_host_resources(host);
	417	nlm_release_host(host);
	418	return rpc_success;
	419	}
	420
	421	/*
	422	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	423	*/
7111c66e	424	static __be32
1da177e4 LT	425	nlm4svc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
	426	void *resp)
	427	{
27459f09 CL	428	struct sockaddr_in saddr;
	429
	430	memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr));
1da177e4 LT	431
	432	dprintk("lockd: SM_NOTIFY called\n");
	433	if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
	434	\|\| ntohs(saddr.sin_port) >= 1024) {
ad06e4bd CL	435	char buf[RPC_MAX_ADDRBUFLEN];
	436	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	437	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	438	return rpc_system_err;
	439	}
	440
	441	/* Obtain the host pointer for this NFS server and try to
	442	* reclaim all locks we hold on this server.
	443	*/
cf712c24	444	memset(&saddr, 0, sizeof(saddr));
1da177e4	445	saddr.sin_addr.s_addr = argp->addr;
5c8dd29c	446	nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state);
1da177e4	447
1da177e4 LT	448	return rpc_success;
	449	}
	450
	451	/*
	452	* client sent a GRANTED_RES, let's remove the associated block
	453	*/
7111c66e	454	static __be32
1da177e4 LT	455	nlm4svc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
	456	void *resp)
	457	{
	458	if (!nlmsvc_ops)
	459	return rpc_success;
	460
	461	dprintk("lockd: GRANTED_RES called\n");
	462
39be4502	463	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	464	return rpc_success;
	465	}
	466
	467
1da177e4 LT	468	/*
	469	* NLM Server procedures.
	470	*/
	471
	472	#define nlm4svc_encode_norep nlm4svc_encode_void
	473	#define nlm4svc_decode_norep nlm4svc_decode_void
	474	#define nlm4svc_decode_testres nlm4svc_decode_void
	475	#define nlm4svc_decode_lockres nlm4svc_decode_void
	476	#define nlm4svc_decode_unlockres nlm4svc_decode_void
	477	#define nlm4svc_decode_cancelres nlm4svc_decode_void
	478	#define nlm4svc_decode_grantedres nlm4svc_decode_void
	479
	480	#define nlm4svc_proc_none nlm4svc_proc_null
	481	#define nlm4svc_proc_test_res nlm4svc_proc_null
	482	#define nlm4svc_proc_lock_res nlm4svc_proc_null
	483	#define nlm4svc_proc_cancel_res nlm4svc_proc_null
	484	#define nlm4svc_proc_unlock_res nlm4svc_proc_null
	485
	486	struct nlm_void { int dummy; };
	487
	488	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	489	{ .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
	490	.pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
	491	.pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
	492	.pc_release = NULL, \
	493	.pc_argsize = sizeof(struct nlm_##argt), \
	494	.pc_ressize = sizeof(struct nlm_##rest), \
	495	.pc_xdrressize = respsize, \
	496	}
	497	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	498	#define No (1+1024/4) /* netobj */
	499	#define St 1 /* status */
	500	#define Rg 4 /* range (offset + length) */
	501	struct svc_procedure nlmsvc_procedures4[] = {
	502	PROC(null, void, void, void, void, 1),
	503	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	504	PROC(lock, lockargs, res, args, res, Ck+St),
	505	PROC(cancel, cancargs, res, args, res, Ck+St),
	506	PROC(unlock, unlockargs, res, args, res, Ck+St),
	507	PROC(granted, testargs, res, args, res, Ck+St),
	508	PROC(test_msg, testargs, norep, args, void, 1),
	509	PROC(lock_msg, lockargs, norep, args, void, 1),
	510	PROC(cancel_msg, cancargs, norep, args, void, 1),
	511	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	512	PROC(granted_msg, testargs, norep, args, void, 1),
	513	PROC(test_res, testres, norep, res, void, 1),
	514	PROC(lock_res, lockres, norep, res, void, 1),
	515	PROC(cancel_res, cancelres, norep, res, void, 1),
	516	PROC(unlock_res, unlockres, norep, res, void, 1),
	517	PROC(granted_res, res, norep, res, void, 1),
	518	/* statd callback */
	519	PROC(sm_notify, reboot, void, reboot, void, 1),
	520	PROC(none, void, void, void, void, 0),
	521	PROC(none, void, void, void, void, 0),
	522	PROC(none, void, void, void, void, 0),
	523	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	524	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	525	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	526	PROC(free_all, notify, void, args, void, 1),
	527
	528	};