[linux-block.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/smp_lock.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>
405f5571	13	#include <linux/smp_lock.h>
1da177e4 LT	14	#include <linux/in.h>
	15	#include <linux/sunrpc/svc.h>
	16	#include <linux/sunrpc/clnt.h>
	17	#include <linux/nfsd/nfsd.h>
	18	#include <linux/lockd/lockd.h>
	19	#include <linux/lockd/share.h>
1da177e4 LT	20
	21	#define NLMDBG_FACILITY NLMDBG_CLIENT
	22
1da177e4 LT	23	/*
	24	* Obtain client and file from arguments
	25	*/
52921e02	26	static __be32
1da177e4 LT	27	nlm4svc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	28	struct nlm_host hostp, struct nlm_file filp)
	29	{
	30	struct nlm_host *host = NULL;
	31	struct nlm_file *file = NULL;
	32	struct nlm_lock *lock = &argp->lock;
52921e02	33	__be32 error = 0;
1da177e4 LT	34
	35	/* nfsd callbacks must have been installed for this procedure */
	36	if (!nlmsvc_ops)
	37	return nlm_lck_denied_nolocks;
	38
	39	/* Obtain host handle */
db4e4c9a	40	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
977faf39	41	\|\| (argp->monitor && nsm_monitor(host) < 0))
1da177e4 LT	42	goto no_locks;
	43	*hostp = host;
	44
	45	/* Obtain file pointer. Not used by FREE_ALL call. */
	46	if (filp != NULL) {
	47	if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
	48	goto no_locks;
	49	*filp = file;
	50
	51	/* Set up the missing parts of the file_lock structure */
	52	lock->fl.fl_file = file->f_file;
	53	lock->fl.fl_owner = (fl_owner_t) host;
	54	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	55	}
	56
	57	return 0;
	58
	59	no_locks:
b0e92aae	60	nlm_release_host(host);
1da177e4 LT	61	if (error)
	62	return error;
	63	return nlm_lck_denied_nolocks;
	64	}
	65
	66	/*
	67	* NULL: Test for presence of service
	68	*/
7111c66e	69	static __be32
1da177e4 LT	70	nlm4svc_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	71	{
	72	dprintk("lockd: NULL called\n");
	73	return rpc_success;
	74	}
	75
	76	/*
	77	* TEST: Check for conflicting lock
	78	*/
7111c66e	79	static __be32
1da177e4 LT	80	nlm4svc_proc_test(struct svc_rqst rqstp, struct nlm_args argp,
	81	struct nlm_res *resp)
	82	{
	83	struct nlm_host *host;
	84	struct nlm_file *file;
317602f3	85	__be32 rc = rpc_success;
1da177e4 LT	86
	87	dprintk("lockd: TEST4 called\n");
	88	resp->cookie = argp->cookie;
	89
1da177e4 LT	90	/* Obtain client and file */
1da177e4 LT	91	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	92	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	93
1da177e4 LT	94	/* Now check for conflicting locks */
8f920d5e	95	resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
5ea0d750	96	if (resp->status == nlm_drop_reply)
b7e6b869 OD	97	rc = rpc_drop_reply;
	98	else
	99	dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
1da177e4	100
1da177e4 LT	101	nlm_release_host(host);
1da177e4 LT	102	nlm_release_file(file);
b7e6b869	103	return rc;
1da177e4 LT	104	}
1da177e4 LT	105
7111c66e	106	static __be32
1da177e4 LT	107	nlm4svc_proc_lock(struct svc_rqst rqstp, struct nlm_args argp,
	108	struct nlm_res *resp)
	109	{
	110	struct nlm_host *host;
	111	struct nlm_file *file;
317602f3	112	__be32 rc = rpc_success;
1da177e4 LT	113
	114	dprintk("lockd: LOCK called\n");
	115
	116	resp->cookie = argp->cookie;
	117
1da177e4 LT	118	/* Obtain client and file */
1da177e4 LT	119	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	120	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	121
	122	#if 0
	123	/* If supplied state doesn't match current state, we assume it's
	124	* an old request that time-warped somehow. Any error return would
	125	* do in this case because it's irrelevant anyway.
	126	*
	127	* NB: We don't retrieve the remote host's state yet.
	128	*/
	129	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	130	resp->status = nlm_lck_denied_nolocks;
	131	} else
	132	#endif
	133
	134	/* Now try to lock the file */
6cde4de8	135	resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
b2b50289 BF	136	argp->block, &argp->cookie,
b2b50289 BF	137	argp->reclaim);
1a8322b2	138	if (resp->status == nlm_drop_reply)
b7e6b869 OD	139	rc = rpc_drop_reply;
	140	else
	141	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
1da177e4	142
1da177e4 LT	143	nlm_release_host(host);
1da177e4 LT	144	nlm_release_file(file);
b7e6b869	145	return rc;
1da177e4 LT	146	}
1da177e4 LT	147
7111c66e	148	static __be32
1da177e4 LT	149	nlm4svc_proc_cancel(struct svc_rqst rqstp, struct nlm_args argp,
	150	struct nlm_res *resp)
	151	{
	152	struct nlm_host *host;
	153	struct nlm_file *file;
	154
	155	dprintk("lockd: CANCEL called\n");
	156
	157	resp->cookie = argp->cookie;
	158
	159	/* Don't accept requests during grace period */
af558e33	160	if (locks_in_grace()) {
1da177e4 LT	161	resp->status = nlm_lck_denied_grace_period;
	162	return rpc_success;
	163	}
	164
	165	/* Obtain client and file */
	166	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	167	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	168
	169	/* Try to cancel request. */
	170	resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
	171
	172	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
	173	nlm_release_host(host);
	174	nlm_release_file(file);
	175	return rpc_success;
	176	}
	177
	178	/*
	179	* UNLOCK: release a lock
	180	*/
7111c66e	181	static __be32
1da177e4 LT	182	nlm4svc_proc_unlock(struct svc_rqst rqstp, struct nlm_args argp,
	183	struct nlm_res *resp)
	184	{
	185	struct nlm_host *host;
	186	struct nlm_file *file;
	187
	188	dprintk("lockd: UNLOCK called\n");
	189
	190	resp->cookie = argp->cookie;
	191
	192	/* Don't accept new lock requests during grace period */
af558e33	193	if (locks_in_grace()) {
1da177e4 LT	194	resp->status = nlm_lck_denied_grace_period;
	195	return rpc_success;
	196	}
	197
	198	/* Obtain client and file */
	199	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	200	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	201
	202	/* Now try to remove the lock */
	203	resp->status = nlmsvc_unlock(file, &argp->lock);
	204
	205	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
	206	nlm_release_host(host);
	207	nlm_release_file(file);
	208	return rpc_success;
	209	}
	210
	211	/*
	212	* GRANTED: A server calls us to tell that a process' lock request
	213	* was granted
	214	*/
7111c66e	215	static __be32
1da177e4 LT	216	nlm4svc_proc_granted(struct svc_rqst rqstp, struct nlm_args argp,
	217	struct nlm_res *resp)
	218	{
	219	resp->cookie = argp->cookie;
	220
	221	dprintk("lockd: GRANTED called\n");
dcff09f1	222	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
1da177e4 LT	223	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	224	return rpc_success;
	225	}
	226
d4716624 TM	227	/*
	228	* This is the generic lockd callback for async RPC calls
	229	*/
	230	static void nlm4svc_callback_exit(struct rpc_task task, void data)
	231	{
c041b5ff	232	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	233	-task->tk_status);
	234	}
	235
	236	static void nlm4svc_callback_release(void *data)
	237	{
a86dc496	238	lock_kernel();
d4716624	239	nlm_release_call(data);
a86dc496	240	unlock_kernel();
d4716624 TM	241	}
	242
	243	static const struct rpc_call_ops nlm4svc_callback_ops = {
	244	.rpc_call_done = nlm4svc_callback_exit,
	245	.rpc_release = nlm4svc_callback_release,
	246	};
	247
1da177e4 LT	248	/*
	249	* `Async' versions of the above service routines. They aren't really,
	250	* because we send the callback before the reply proper. I hope this
	251	* doesn't break any clients.
	252	*/
7111c66e AV	253	static __be32 nlm4svc_callback(struct svc_rqst rqstp, u32 proc, struct nlm_args argp,
7111c66e AV	254	__be32 (func)(struct svc_rqst , struct nlm_args , struct nlm_res ))
1da177e4	255	{
d4716624 TM	256	struct nlm_host *host;
d4716624 TM	257	struct nlm_rqst *call;
7111c66e	258	__be32 stat;
1da177e4	259
db4e4c9a OK	260	host = nlmsvc_lookup_host(rqstp,
	261	argp->lock.caller,
	262	argp->lock.len);
d4716624 TM	263	if (host == NULL)
	264	return rpc_system_err;
	265
	266	call = nlm_alloc_call(host);
	267	if (call == NULL)
	268	return rpc_system_err;
	269
	270	stat = func(rqstp, argp, &call->a_res);
	271	if (stat != 0) {
	272	nlm_release_call(call);
	273	return stat;
	274	}
1da177e4	275
d4716624 TM	276	call->a_flags = RPC_TASK_ASYNC;
	277	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
	278	return rpc_system_err;
	279	return rpc_success;
1da177e4 LT	280	}
1da177e4 LT	281
7111c66e	282	static __be32 nlm4svc_proc_test_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	283	void *resp)
1da177e4 LT	284	{
d4716624 TM	285	dprintk("lockd: TEST_MSG called\n");
	286	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
	287	}
1da177e4	288
7111c66e	289	static __be32 nlm4svc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
d4716624 TM	290	void *resp)
d4716624 TM	291	{
1da177e4	292	dprintk("lockd: LOCK_MSG called\n");
d4716624	293	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
1da177e4 LT	294	}
1da177e4 LT	295
7111c66e	296	static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	297	void *resp)
1da177e4 LT	298	{
1da177e4	299	dprintk("lockd: CANCEL_MSG called\n");
d4716624	300	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
1da177e4 LT	301	}
1da177e4 LT	302
7111c66e	303	static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	304	void *resp)
1da177e4 LT	305	{
1da177e4	306	dprintk("lockd: UNLOCK_MSG called\n");
d4716624	307	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
1da177e4 LT	308	}
1da177e4 LT	309
7111c66e	310	static __be32 nlm4svc_proc_granted_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	311	void *resp)
1da177e4 LT	312	{
1da177e4	313	dprintk("lockd: GRANTED_MSG called\n");
d4716624	314	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
1da177e4 LT	315	}
	316
	317	/*
	318	* SHARE: create a DOS share or alter existing share.
	319	*/
7111c66e	320	static __be32
1da177e4 LT	321	nlm4svc_proc_share(struct svc_rqst rqstp, struct nlm_args argp,
	322	struct nlm_res *resp)
	323	{
	324	struct nlm_host *host;
	325	struct nlm_file *file;
	326
	327	dprintk("lockd: SHARE called\n");
	328
	329	resp->cookie = argp->cookie;
	330
	331	/* Don't accept new lock requests during grace period */
af558e33	332	if (locks_in_grace() && !argp->reclaim) {
1da177e4 LT	333	resp->status = nlm_lck_denied_grace_period;
	334	return rpc_success;
	335	}
	336
	337	/* Obtain client and file */
	338	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	339	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	340
	341	/* Now try to create the share */
	342	resp->status = nlmsvc_share_file(host, file, argp);
	343
	344	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
	345	nlm_release_host(host);
	346	nlm_release_file(file);
	347	return rpc_success;
	348	}
	349
	350	/*
	351	* UNSHARE: Release a DOS share.
	352	*/
7111c66e	353	static __be32
1da177e4 LT	354	nlm4svc_proc_unshare(struct svc_rqst rqstp, struct nlm_args argp,
	355	struct nlm_res *resp)
	356	{
	357	struct nlm_host *host;
	358	struct nlm_file *file;
	359
	360	dprintk("lockd: UNSHARE called\n");
	361
	362	resp->cookie = argp->cookie;
	363
	364	/* Don't accept requests during grace period */
af558e33	365	if (locks_in_grace()) {
1da177e4 LT	366	resp->status = nlm_lck_denied_grace_period;
	367	return rpc_success;
	368	}
	369
	370	/* Obtain client and file */
	371	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	372	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	373
	374	/* Now try to lock the file */
	375	resp->status = nlmsvc_unshare_file(host, file, argp);
	376
	377	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
	378	nlm_release_host(host);
	379	nlm_release_file(file);
	380	return rpc_success;
	381	}
	382
	383	/*
	384	* NM_LOCK: Create an unmonitored lock
	385	*/
7111c66e	386	static __be32
1da177e4 LT	387	nlm4svc_proc_nm_lock(struct svc_rqst rqstp, struct nlm_args argp,
	388	struct nlm_res *resp)
	389	{
	390	dprintk("lockd: NM_LOCK called\n");
	391
	392	argp->monitor = 0; /* just clean the monitor flag */
	393	return nlm4svc_proc_lock(rqstp, argp, resp);
	394	}
	395
	396	/*
	397	* FREE_ALL: Release all locks and shares held by client
	398	*/
7111c66e	399	static __be32
1da177e4 LT	400	nlm4svc_proc_free_all(struct svc_rqst rqstp, struct nlm_args argp,
	401	void *resp)
	402	{
	403	struct nlm_host *host;
	404
	405	/* Obtain client */
	406	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
	407	return rpc_success;
	408
	409	nlmsvc_free_host_resources(host);
	410	nlm_release_host(host);
	411	return rpc_success;
	412	}
	413
	414	/*
	415	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	416	*/
7111c66e	417	static __be32
1da177e4 LT	418	nlm4svc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
	419	void *resp)
	420	{
1da177e4	421	dprintk("lockd: SM_NOTIFY called\n");
b85e4676 CL	422
b85e4676 CL	423	if (!nlm_privileged_requester(rqstp)) {
ad06e4bd CL	424	char buf[RPC_MAX_ADDRBUFLEN];
	425	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	426	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	427	return rpc_system_err;
	428	}
	429
7fefc9cb	430	nlm_host_rebooted(argp);
1da177e4 LT	431	return rpc_success;
	432	}
	433
	434	/*
	435	* client sent a GRANTED_RES, let's remove the associated block
	436	*/
7111c66e	437	static __be32
1da177e4 LT	438	nlm4svc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
	439	void *resp)
	440	{
	441	if (!nlmsvc_ops)
	442	return rpc_success;
	443
	444	dprintk("lockd: GRANTED_RES called\n");
	445
39be4502	446	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	447	return rpc_success;
	448	}
	449
	450
1da177e4 LT	451	/*
	452	* NLM Server procedures.
	453	*/
	454
	455	#define nlm4svc_encode_norep nlm4svc_encode_void
	456	#define nlm4svc_decode_norep nlm4svc_decode_void
	457	#define nlm4svc_decode_testres nlm4svc_decode_void
	458	#define nlm4svc_decode_lockres nlm4svc_decode_void
	459	#define nlm4svc_decode_unlockres nlm4svc_decode_void
	460	#define nlm4svc_decode_cancelres nlm4svc_decode_void
	461	#define nlm4svc_decode_grantedres nlm4svc_decode_void
	462
	463	#define nlm4svc_proc_none nlm4svc_proc_null
	464	#define nlm4svc_proc_test_res nlm4svc_proc_null
	465	#define nlm4svc_proc_lock_res nlm4svc_proc_null
	466	#define nlm4svc_proc_cancel_res nlm4svc_proc_null
	467	#define nlm4svc_proc_unlock_res nlm4svc_proc_null
	468
	469	struct nlm_void { int dummy; };
	470
	471	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	472	{ .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
	473	.pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
	474	.pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
	475	.pc_release = NULL, \
	476	.pc_argsize = sizeof(struct nlm_##argt), \
	477	.pc_ressize = sizeof(struct nlm_##rest), \
	478	.pc_xdrressize = respsize, \
	479	}
	480	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	481	#define No (1+1024/4) /* netobj */
	482	#define St 1 /* status */
	483	#define Rg 4 /* range (offset + length) */
	484	struct svc_procedure nlmsvc_procedures4[] = {
	485	PROC(null, void, void, void, void, 1),
	486	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	487	PROC(lock, lockargs, res, args, res, Ck+St),
	488	PROC(cancel, cancargs, res, args, res, Ck+St),
	489	PROC(unlock, unlockargs, res, args, res, Ck+St),
	490	PROC(granted, testargs, res, args, res, Ck+St),
	491	PROC(test_msg, testargs, norep, args, void, 1),
	492	PROC(lock_msg, lockargs, norep, args, void, 1),
	493	PROC(cancel_msg, cancargs, norep, args, void, 1),
	494	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	495	PROC(granted_msg, testargs, norep, args, void, 1),
	496	PROC(test_res, testres, norep, res, void, 1),
	497	PROC(lock_res, lockres, norep, res, void, 1),
	498	PROC(cancel_res, cancelres, norep, res, void, 1),
	499	PROC(unlock_res, unlockres, norep, res, void, 1),
	500	PROC(granted_res, res, norep, res, void, 1),
	501	/* statd callback */
	502	PROC(sm_notify, reboot, void, reboot, void, 1),
	503	PROC(none, void, void, void, void, 0),
	504	PROC(none, void, void, void, void, 0),
	505	PROC(none, void, void, void, void, 0),
	506	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	507	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	508	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	509	PROC(free_all, notify, void, args, void, 1),
	510
	511	};