[deliverable/linux.git] / fs / lockd / svcproc.c

/*
 * linux/fs/lockd/svcproc.c
 *
 * Lockd server procedures. We don't implement the NLM_*_RES 
 * procedures because we don't use the async procedures.
 *
 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/types.h>
#include <linux/time.h>
#include <linux/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

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

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

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

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

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

	/* Obtain file pointer. Not used by FREE_ALL call. */
	if (filp != NULL) {
		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
nlmsvc_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
nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
				         struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

	dprintk("lockd: TEST          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 = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now check for conflicting locks */
	resp->status = cast_status(nlmsvc_testlock(rqstp, file, &argp->lock, &resp->lock, &resp->cookie));
	if (resp->status == nlm_drop_reply)
		return rpc_drop_reply;

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

static __be32
nlmsvc_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 = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

#if 0
	/* If supplied state doesn't match current state, we assume it's
	 * an old request that time-warped somehow. Any error return would
	 * do in this case because it's irrelevant anyway.
	 *
	 * NB: We don't retrieve the remote host's state yet.
	 */
	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
		resp->status = nlm_lck_denied_nolocks;
	} else
#endif

	/* Now try to lock the file */
	resp->status = cast_status(nlmsvc_lock(rqstp, file, &argp->lock,
					       argp->block, &argp->cookie));

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

static __be32
nlmsvc_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 = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Try to cancel request. */
	resp->status = cast_status(nlmsvc_cancel_blocked(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
nlmsvc_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 = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now try to remove the lock */
	resp->status = cast_status(nlmsvc_unlock(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
nlmsvc_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 nlmsvc_callback_exit(struct rpc_task *task, void *data)
{
	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
			-task->tk_status);
}

static void nlmsvc_callback_release(void *data)
{
	nlm_release_call(data);
}

static const struct rpc_call_ops nlmsvc_callback_ops = {
	.rpc_call_done = nlmsvc_callback_exit,
	.rpc_release = nlmsvc_callback_release,
};

/*
 * `Async' versions of the above service routines. They aren't really,
 * because we send the callback before the reply proper. I hope this
 * doesn't break any clients.
 */
static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, 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, &nlmsvc_callback_ops) < 0)
		return rpc_system_err;
	return rpc_success;
}

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

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

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

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

static __be32
nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
                                                void            *resp)
{
	dprintk("lockd: GRANTED_MSG   called\n");
	return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted);
}

/*
 * SHARE: create a DOS share or alter existing share.
 */
static __be32
nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
				          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 = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now try to create the share */
	resp->status = cast_status(nlmsvc_share_file(host, file, argp));

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

/*
 * UNSHARE: Release a DOS share.
 */
static __be32
nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
				            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 = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now try to unshare the file */
	resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));

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

/*
 * NM_LOCK: Create an unmonitored lock
 */
static __be32
nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
				            struct nlm_res  *resp)
{
	dprintk("lockd: NM_LOCK       called\n");

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

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

	/* Obtain client */
	if (nlmsvc_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
nlmsvc_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
nlmsvc_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 nlmsvc_encode_norep	nlmsvc_encode_void
#define nlmsvc_decode_norep	nlmsvc_decode_void
#define nlmsvc_decode_testres	nlmsvc_decode_void
#define nlmsvc_decode_lockres	nlmsvc_decode_void
#define nlmsvc_decode_unlockres	nlmsvc_decode_void
#define nlmsvc_decode_cancelres	nlmsvc_decode_void
#define nlmsvc_decode_grantedres	nlmsvc_decode_void

#define nlmsvc_proc_none	nlmsvc_proc_null
#define nlmsvc_proc_test_res	nlmsvc_proc_null
#define nlmsvc_proc_lock_res	nlmsvc_proc_null
#define nlmsvc_proc_cancel_res	nlmsvc_proc_null
#define nlmsvc_proc_unlock_res	nlmsvc_proc_null

struct nlm_void			{ int dummy; };

#define PROC(name, xargt, xrest, argt, rest, respsize)	\
 { .pc_func	= (svc_procfunc) nlmsvc_proc_##name,	\
   .pc_decode	= (kxdrproc_t) nlmsvc_decode_##xargt,	\
   .pc_encode	= (kxdrproc_t) nlmsvc_encode_##xrest,	\
   .pc_release	= NULL,					\
   .pc_argsize	= sizeof(struct nlm_##argt),		\
   .pc_ressize	= sizeof(struct nlm_##rest),		\
   .pc_xdrressize = respsize,				\
 }

#define	Ck	(1+XDR_QUADLEN(NLM_MAXCOOKIELEN))	/* cookie */
#define	St	1				/* status */
#define	No	(1+1024/4)			/* Net Obj */
#define	Rg	2				/* range - offset + size */

struct svc_procedure		nlmsvc_procedures[] = {
  PROC(null,		void,		void,		void,	void, 1),
  PROC(test,		testargs,	testres,	args,	res, Ck+St+2+No+Rg),
  PROC(lock,		lockargs,	res,		args,	res, Ck+St),
  PROC(cancel,		cancargs,	res,		args,	res, Ck+St),
  PROC(unlock,		unlockargs,	res,		args,	res, Ck+St),
  PROC(granted,		testargs,	res,		args,	res, Ck+St),
  PROC(test_msg,	testargs,	norep,		args,	void, 1),
  PROC(lock_msg,	lockargs,	norep,		args,	void, 1),
  PROC(cancel_msg,	cancargs,	norep,		args,	void, 1),
  PROC(unlock_msg,	unlockargs,	norep,		args,	void, 1),
  PROC(granted_msg,	testargs,	norep,		args,	void, 1),
  PROC(test_res,	testres,	norep,		res,	void, 1),
  PROC(lock_res,	lockres,	norep,		res,	void, 1),
  PROC(cancel_res,	cancelres,	norep,		res,	void, 1),
  PROC(unlock_res,	unlockres,	norep,		res,	void, 1),
  PROC(granted_res,	res,		norep,		res,	void, 1),
  /* statd callback */
  PROC(sm_notify,	reboot,		void,		reboot,	void, 1),
  PROC(none,		void,		void,		void,	void, 1),
  PROC(none,		void,		void,		void,	void, 1),
  PROC(none,		void,		void,		void,	void, 1),
  PROC(share,		shareargs,	shareres,	args,	res, Ck+St+1),
  PROC(unshare,		shareargs,	shareres,	args,	res, Ck+St+1),
  PROC(nm_lock,		lockargs,	res,		args,	res, Ck+St),
  PROC(free_all,	notify,		void,		args,	void, 0),

};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/lockd/svcproc.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
1da177e4 LT	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	24	#ifdef CONFIG_LOCKD_V4
52921e02 AV	25	static __be32
52921e02 AV	26	cast_to_nlm(__be32 status, u32 vers)
1da177e4 LT	27	{
	28	/* Note: status is assumed to be in network byte order !!! */
	29	if (vers != 4){
	30	switch (status) {
	31	case nlm_granted:
	32	case nlm_lck_denied:
	33	case nlm_lck_denied_nolocks:
	34	case nlm_lck_blocked:
	35	case nlm_lck_denied_grace_period:
5ea0d750	36	case nlm_drop_reply:
1da177e4 LT	37	break;
	38	case nlm4_deadlock:
	39	status = nlm_lck_denied;
	40	break;
	41	default:
	42	status = nlm_lck_denied_nolocks;
	43	}
	44	}
	45
	46	return (status);
	47	}
	48	#define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
	49	#else
	50	#define cast_status(status) (status)
	51	#endif
	52
	53	/*
	54	* Obtain client and file from arguments
	55	*/
52921e02	56	static __be32
1da177e4 LT	57	nlmsvc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	58	struct nlm_host hostp, struct nlm_file filp)
	59	{
	60	struct nlm_host *host = NULL;
	61	struct nlm_file *file = NULL;
	62	struct nlm_lock *lock = &argp->lock;
52921e02	63	__be32 error = 0;
1da177e4 LT	64
	65	/* nfsd callbacks must have been installed for this procedure */
	66	if (!nlmsvc_ops)
	67	return nlm_lck_denied_nolocks;
	68
	69	/* Obtain host handle */
db4e4c9a	70	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
977faf39	71	\|\| (argp->monitor && nsm_monitor(host) < 0))
1da177e4 LT	72	goto no_locks;
	73	*hostp = host;
	74
	75	/* Obtain file pointer. Not used by FREE_ALL call. */
	76	if (filp != NULL) {
	77	if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
	78	goto no_locks;
	79	*filp = file;
	80
	81	/* Set up the missing parts of the file_lock structure */
	82	lock->fl.fl_file = file->f_file;
	83	lock->fl.fl_owner = (fl_owner_t) host;
	84	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	85	}
	86
	87	return 0;
	88
	89	no_locks:
	90	if (host)
	91	nlm_release_host(host);
d343fce1 N	92	if (error)
d343fce1 N	93	return error;
1da177e4 LT	94	return nlm_lck_denied_nolocks;
	95	}
	96
	97	/*
	98	* NULL: Test for presence of service
	99	*/
7111c66e	100	static __be32
1da177e4 LT	101	nlmsvc_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	102	{
	103	dprintk("lockd: NULL called\n");
	104	return rpc_success;
	105	}
	106
	107	/*
	108	* TEST: Check for conflicting lock
	109	*/
7111c66e	110	static __be32
1da177e4 LT	111	nlmsvc_proc_test(struct svc_rqst rqstp, struct nlm_args argp,
	112	struct nlm_res *resp)
	113	{
	114	struct nlm_host *host;
	115	struct nlm_file *file;
	116
	117	dprintk("lockd: TEST called\n");
	118	resp->cookie = argp->cookie;
	119
	120	/* Don't accept test requests during grace period */
	121	if (nlmsvc_grace_period) {
	122	resp->status = nlm_lck_denied_grace_period;
	123	return rpc_success;
	124	}
	125
	126	/* Obtain client and file */
	127	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	128	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	129
1da177e4 LT	130	/* Now check for conflicting locks */
85f3f1b3	131	resp->status = cast_status(nlmsvc_testlock(rqstp, file, &argp->lock, &resp->lock, &resp->cookie));
5ea0d750 ME	132	if (resp->status == nlm_drop_reply)
5ea0d750 ME	133	return rpc_drop_reply;
1da177e4 LT	134
	135	dprintk("lockd: TEST status %d vers %d\n",
	136	ntohl(resp->status), rqstp->rq_vers);
	137	nlm_release_host(host);
	138	nlm_release_file(file);
	139	return rpc_success;
	140	}
	141
7111c66e	142	static __be32
1da177e4 LT	143	nlmsvc_proc_lock(struct svc_rqst rqstp, struct nlm_args argp,
	144	struct nlm_res *resp)
	145	{
	146	struct nlm_host *host;
	147	struct nlm_file *file;
	148
	149	dprintk("lockd: LOCK called\n");
	150
	151	resp->cookie = argp->cookie;
	152
	153	/* Don't accept new lock requests during grace period */
	154	if (nlmsvc_grace_period && !argp->reclaim) {
	155	resp->status = nlm_lck_denied_grace_period;
	156	return rpc_success;
	157	}
	158
	159	/* Obtain client and file */
	160	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	161	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	162
	163	#if 0
	164	/* If supplied state doesn't match current state, we assume it's
	165	* an old request that time-warped somehow. Any error return would
	166	* do in this case because it's irrelevant anyway.
	167	*
	168	* NB: We don't retrieve the remote host's state yet.
	169	*/
	170	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	171	resp->status = nlm_lck_denied_nolocks;
	172	} else
	173	#endif
	174
	175	/* Now try to lock the file */
	176	resp->status = cast_status(nlmsvc_lock(rqstp, file, &argp->lock,
	177	argp->block, &argp->cookie));
	178
	179	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
	180	nlm_release_host(host);
	181	nlm_release_file(file);
	182	return rpc_success;
	183	}
	184
7111c66e	185	static __be32
1da177e4 LT	186	nlmsvc_proc_cancel(struct svc_rqst rqstp, struct nlm_args argp,
	187	struct nlm_res *resp)
	188	{
	189	struct nlm_host *host;
	190	struct nlm_file *file;
	191
	192	dprintk("lockd: CANCEL called\n");
	193
	194	resp->cookie = argp->cookie;
	195
	196	/* Don't accept requests during grace period */
	197	if (nlmsvc_grace_period) {
	198	resp->status = nlm_lck_denied_grace_period;
	199	return rpc_success;
	200	}
	201
	202	/* Obtain client and file */
	203	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	204	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	205
	206	/* Try to cancel request. */
	207	resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock));
	208
	209	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
	210	nlm_release_host(host);
	211	nlm_release_file(file);
	212	return rpc_success;
	213	}
	214
	215	/*
	216	* UNLOCK: release a lock
	217	*/
7111c66e	218	static __be32
1da177e4 LT	219	nlmsvc_proc_unlock(struct svc_rqst rqstp, struct nlm_args argp,
	220	struct nlm_res *resp)
	221	{
	222	struct nlm_host *host;
	223	struct nlm_file *file;
	224
	225	dprintk("lockd: UNLOCK called\n");
	226
	227	resp->cookie = argp->cookie;
	228
	229	/* Don't accept new lock requests during grace period */
	230	if (nlmsvc_grace_period) {
	231	resp->status = nlm_lck_denied_grace_period;
	232	return rpc_success;
	233	}
	234
	235	/* Obtain client and file */
	236	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	237	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	238
	239	/* Now try to remove the lock */
	240	resp->status = cast_status(nlmsvc_unlock(file, &argp->lock));
	241
	242	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
	243	nlm_release_host(host);
	244	nlm_release_file(file);
	245	return rpc_success;
	246	}
	247
	248	/*
	249	* GRANTED: A server calls us to tell that a process' lock request
	250	* was granted
	251	*/
7111c66e	252	static __be32
1da177e4 LT	253	nlmsvc_proc_granted(struct svc_rqst rqstp, struct nlm_args argp,
	254	struct nlm_res *resp)
	255	{
	256	resp->cookie = argp->cookie;
	257
	258	dprintk("lockd: GRANTED called\n");
27459f09	259	resp->status = nlmclnt_grant(svc_addr_in(rqstp), &argp->lock);
1da177e4 LT	260	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	261	return rpc_success;
	262	}
	263
d4716624 TM	264	/*
	265	* This is the generic lockd callback for async RPC calls
	266	*/
	267	static void nlmsvc_callback_exit(struct rpc_task task, void data)
	268	{
c041b5ff	269	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	270	-task->tk_status);
	271	}
	272
	273	static void nlmsvc_callback_release(void *data)
	274	{
	275	nlm_release_call(data);
	276	}
	277
	278	static const struct rpc_call_ops nlmsvc_callback_ops = {
	279	.rpc_call_done = nlmsvc_callback_exit,
	280	.rpc_release = nlmsvc_callback_release,
	281	};
	282
1da177e4 LT	283	/*
	284	* `Async' versions of the above service routines. They aren't really,
	285	* because we send the callback before the reply proper. I hope this
	286	* doesn't break any clients.
	287	*/
7111c66e AV	288	static __be32 nlmsvc_callback(struct svc_rqst rqstp, u32 proc, struct nlm_args argp,
7111c66e AV	289	__be32 (func)(struct svc_rqst , struct nlm_args , struct nlm_res ))
1da177e4	290	{
d4716624 TM	291	struct nlm_host *host;
d4716624 TM	292	struct nlm_rqst *call;
7111c66e	293	__be32 stat;
1da177e4	294
db4e4c9a OK	295	host = nlmsvc_lookup_host(rqstp,
	296	argp->lock.caller,
	297	argp->lock.len);
d4716624 TM	298	if (host == NULL)
	299	return rpc_system_err;
	300
	301	call = nlm_alloc_call(host);
	302	if (call == NULL)
	303	return rpc_system_err;
	304
	305	stat = func(rqstp, argp, &call->a_res);
	306	if (stat != 0) {
	307	nlm_release_call(call);
	308	return stat;
	309	}
1da177e4	310
d4716624 TM	311	call->a_flags = RPC_TASK_ASYNC;
	312	if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
	313	return rpc_system_err;
	314	return rpc_success;
1da177e4 LT	315	}
1da177e4 LT	316
7111c66e	317	static __be32 nlmsvc_proc_test_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	318	void *resp)
1da177e4 LT	319	{
d4716624 TM	320	dprintk("lockd: TEST_MSG called\n");
	321	return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test);
	322	}
1da177e4	323
7111c66e	324	static __be32 nlmsvc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
d4716624 TM	325	void *resp)
d4716624 TM	326	{
1da177e4	327	dprintk("lockd: LOCK_MSG called\n");
d4716624	328	return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock);
1da177e4 LT	329	}
1da177e4 LT	330
7111c66e	331	static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	332	void *resp)
1da177e4 LT	333	{
1da177e4	334	dprintk("lockd: CANCEL_MSG called\n");
d4716624	335	return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel);
1da177e4 LT	336	}
1da177e4 LT	337
7111c66e	338	static __be32
1da177e4 LT	339	nlmsvc_proc_unlock_msg(struct svc_rqst rqstp, struct nlm_args argp,
	340	void *resp)
	341	{
1da177e4	342	dprintk("lockd: UNLOCK_MSG called\n");
d4716624	343	return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock);
1da177e4 LT	344	}
1da177e4 LT	345
7111c66e	346	static __be32
1da177e4 LT	347	nlmsvc_proc_granted_msg(struct svc_rqst rqstp, struct nlm_args argp,
	348	void *resp)
	349	{
1da177e4	350	dprintk("lockd: GRANTED_MSG called\n");
d4716624	351	return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted);
1da177e4 LT	352	}
	353
	354	/*
	355	* SHARE: create a DOS share or alter existing share.
	356	*/
7111c66e	357	static __be32
1da177e4 LT	358	nlmsvc_proc_share(struct svc_rqst rqstp, struct nlm_args argp,
	359	struct nlm_res *resp)
	360	{
	361	struct nlm_host *host;
	362	struct nlm_file *file;
	363
	364	dprintk("lockd: SHARE called\n");
	365
	366	resp->cookie = argp->cookie;
	367
	368	/* Don't accept new lock requests during grace period */
	369	if (nlmsvc_grace_period && !argp->reclaim) {
	370	resp->status = nlm_lck_denied_grace_period;
	371	return rpc_success;
	372	}
	373
	374	/* Obtain client and file */
	375	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	376	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	377
	378	/* Now try to create the share */
	379	resp->status = cast_status(nlmsvc_share_file(host, file, argp));
	380
	381	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
	382	nlm_release_host(host);
	383	nlm_release_file(file);
	384	return rpc_success;
	385	}
	386
	387	/*
	388	* UNSHARE: Release a DOS share.
	389	*/
7111c66e	390	static __be32
1da177e4 LT	391	nlmsvc_proc_unshare(struct svc_rqst rqstp, struct nlm_args argp,
	392	struct nlm_res *resp)
	393	{
	394	struct nlm_host *host;
	395	struct nlm_file *file;
	396
	397	dprintk("lockd: UNSHARE called\n");
	398
	399	resp->cookie = argp->cookie;
	400
	401	/* Don't accept requests during grace period */
	402	if (nlmsvc_grace_period) {
	403	resp->status = nlm_lck_denied_grace_period;
	404	return rpc_success;
	405	}
	406
	407	/* Obtain client and file */
	408	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	409	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	410
	411	/* Now try to unshare the file */
	412	resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
	413
	414	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
	415	nlm_release_host(host);
	416	nlm_release_file(file);
	417	return rpc_success;
	418	}
	419
	420	/*
	421	* NM_LOCK: Create an unmonitored lock
	422	*/
7111c66e	423	static __be32
1da177e4 LT	424	nlmsvc_proc_nm_lock(struct svc_rqst rqstp, struct nlm_args argp,
	425	struct nlm_res *resp)
	426	{
	427	dprintk("lockd: NM_LOCK called\n");
	428
	429	argp->monitor = 0; /* just clean the monitor flag */
	430	return nlmsvc_proc_lock(rqstp, argp, resp);
	431	}
	432
	433	/*
	434	* FREE_ALL: Release all locks and shares held by client
	435	*/
7111c66e	436	static __be32
1da177e4 LT	437	nlmsvc_proc_free_all(struct svc_rqst rqstp, struct nlm_args argp,
	438	void *resp)
	439	{
	440	struct nlm_host *host;
	441
	442	/* Obtain client */
	443	if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
	444	return rpc_success;
	445
	446	nlmsvc_free_host_resources(host);
	447	nlm_release_host(host);
	448	return rpc_success;
	449	}
	450
	451	/*
	452	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	453	*/
7111c66e	454	static __be32
1da177e4 LT	455	nlmsvc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
	456	void *resp)
	457	{
27459f09 CL	458	struct sockaddr_in saddr;
	459
	460	memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr));
1da177e4 LT	461
	462	dprintk("lockd: SM_NOTIFY called\n");
	463	if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
	464	\|\| ntohs(saddr.sin_port) >= 1024) {
ad06e4bd CL	465	char buf[RPC_MAX_ADDRBUFLEN];
	466	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	467	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	468	return rpc_system_err;
	469	}
	470
	471	/* Obtain the host pointer for this NFS server and try to
	472	* reclaim all locks we hold on this server.
	473	*/
cf712c24	474	memset(&saddr, 0, sizeof(saddr));
1da177e4	475	saddr.sin_addr.s_addr = argp->addr;
5c8dd29c	476	nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state);
1da177e4 LT	477
	478	return rpc_success;
	479	}
	480
	481	/*
	482	* client sent a GRANTED_RES, let's remove the associated block
	483	*/
7111c66e	484	static __be32
1da177e4 LT	485	nlmsvc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
	486	void *resp)
	487	{
	488	if (!nlmsvc_ops)
	489	return rpc_success;
	490
	491	dprintk("lockd: GRANTED_RES called\n");
	492
39be4502	493	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	494	return rpc_success;
	495	}
	496
1da177e4 LT	497	/*
	498	* NLM Server procedures.
	499	*/
	500
	501	#define nlmsvc_encode_norep nlmsvc_encode_void
	502	#define nlmsvc_decode_norep nlmsvc_decode_void
	503	#define nlmsvc_decode_testres nlmsvc_decode_void
	504	#define nlmsvc_decode_lockres nlmsvc_decode_void
	505	#define nlmsvc_decode_unlockres nlmsvc_decode_void
	506	#define nlmsvc_decode_cancelres nlmsvc_decode_void
	507	#define nlmsvc_decode_grantedres nlmsvc_decode_void
	508
	509	#define nlmsvc_proc_none nlmsvc_proc_null
	510	#define nlmsvc_proc_test_res nlmsvc_proc_null
	511	#define nlmsvc_proc_lock_res nlmsvc_proc_null
	512	#define nlmsvc_proc_cancel_res nlmsvc_proc_null
	513	#define nlmsvc_proc_unlock_res nlmsvc_proc_null
	514
	515	struct nlm_void { int dummy; };
	516
	517	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	518	{ .pc_func = (svc_procfunc) nlmsvc_proc_##name, \
	519	.pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \
	520	.pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \
	521	.pc_release = NULL, \
	522	.pc_argsize = sizeof(struct nlm_##argt), \
	523	.pc_ressize = sizeof(struct nlm_##rest), \
	524	.pc_xdrressize = respsize, \
	525	}
	526
	527	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	528	#define St 1 /* status */
	529	#define No (1+1024/4) /* Net Obj */
	530	#define Rg 2 /* range - offset + size */
	531
	532	struct svc_procedure nlmsvc_procedures[] = {
	533	PROC(null, void, void, void, void, 1),
	534	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	535	PROC(lock, lockargs, res, args, res, Ck+St),
	536	PROC(cancel, cancargs, res, args, res, Ck+St),
	537	PROC(unlock, unlockargs, res, args, res, Ck+St),
	538	PROC(granted, testargs, res, args, res, Ck+St),
	539	PROC(test_msg, testargs, norep, args, void, 1),
	540	PROC(lock_msg, lockargs, norep, args, void, 1),
	541	PROC(cancel_msg, cancargs, norep, args, void, 1),
	542	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	543	PROC(granted_msg, testargs, norep, args, void, 1),
	544	PROC(test_res, testres, norep, res, void, 1),
	545	PROC(lock_res, lockres, norep, res, void, 1),
	546	PROC(cancel_res, cancelres, norep, res, void, 1),
	547	PROC(unlock_res, unlockres, norep, res, void, 1),
	548	PROC(granted_res, res, norep, res, void, 1),
	549	/* statd callback */
	550	PROC(sm_notify, reboot, void, reboot, void, 1),
	551	PROC(none, void, void, void, void, 1),
	552	PROC(none, void, void, void, void, 1),
	553	PROC(none, void, void, void, void, 1),
	554	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	555	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	556	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	557	PROC(free_all, notify, void, args, void, 0),
	558
	559	};