[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 <[email protected]>
 */

#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 u32
cast_to_nlm(u32 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:
			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 u32
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;
	u32			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 int
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 int
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(file, &argp->lock, &resp->lock));

	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 int
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 int
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 int
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 int
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(&rqstp->rq_addr, &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: %4d 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 int nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
		int (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res  *))
{
	struct nlm_host	*host;
	struct nlm_rqst	*call;
	int 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 int 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 int 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 int 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 int
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 int
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 int
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 int
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 int
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 int
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 int
nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
					      void	        *resp)
{
	struct sockaddr_in	saddr = rqstp->rq_addr;

	dprintk("lockd: SM_NOTIFY     called\n");
	if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
	 || ntohs(saddr.sin_port) >= 1024) {
		printk(KERN_WARNING
			"lockd: rejected NSM callback from %08x:%d\n",
			ntohl(rqstp->rq_addr.sin_addr.s_addr),
			ntohs(rqstp->rq_addr.sin_port));
		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 int
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 <[email protected]>
	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 LT	24	#ifdef CONFIG_LOCKD_V4
	25	static u32
	26	cast_to_nlm(u32 status, u32 vers)
	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:
	36	break;
	37	case nlm4_deadlock:
	38	status = nlm_lck_denied;
	39	break;
	40	default:
	41	status = nlm_lck_denied_nolocks;
	42	}
	43	}
	44
	45	return (status);
	46	}
	47	#define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
	48	#else
	49	#define cast_status(status) (status)
	50	#endif
	51
	52	/*
	53	* Obtain client and file from arguments
	54	*/
	55	static u32
	56	nlmsvc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	57	struct nlm_host hostp, struct nlm_file filp)
	58	{
	59	struct nlm_host *host = NULL;
	60	struct nlm_file *file = NULL;
	61	struct nlm_lock *lock = &argp->lock;
d343fce1	62	u32 error = 0;
1da177e4 LT	63
	64	/* nfsd callbacks must have been installed for this procedure */
	65	if (!nlmsvc_ops)
	66	return nlm_lck_denied_nolocks;
	67
	68	/* Obtain host handle */
db4e4c9a	69	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
977faf39	70	\|\| (argp->monitor && nsm_monitor(host) < 0))
1da177e4 LT	71	goto no_locks;
	72	*hostp = host;
	73
	74	/* Obtain file pointer. Not used by FREE_ALL call. */
	75	if (filp != NULL) {
	76	if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
	77	goto no_locks;
	78	*filp = file;
	79
	80	/* Set up the missing parts of the file_lock structure */
	81	lock->fl.fl_file = file->f_file;
	82	lock->fl.fl_owner = (fl_owner_t) host;
	83	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	84	}
	85
	86	return 0;
	87
	88	no_locks:
	89	if (host)
	90	nlm_release_host(host);
d343fce1 N	91	if (error)
d343fce1 N	92	return error;
1da177e4 LT	93	return nlm_lck_denied_nolocks;
	94	}
	95
	96	/*
	97	* NULL: Test for presence of service
	98	*/
	99	static int
	100	nlmsvc_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	101	{
	102	dprintk("lockd: NULL called\n");
	103	return rpc_success;
	104	}
	105
	106	/*
	107	* TEST: Check for conflicting lock
	108	*/
	109	static int
	110	nlmsvc_proc_test(struct svc_rqst rqstp, struct nlm_args argp,
	111	struct nlm_res *resp)
	112	{
	113	struct nlm_host *host;
	114	struct nlm_file *file;
	115
	116	dprintk("lockd: TEST called\n");
	117	resp->cookie = argp->cookie;
	118
	119	/* Don't accept test requests during grace period */
	120	if (nlmsvc_grace_period) {
	121	resp->status = nlm_lck_denied_grace_period;
	122	return rpc_success;
	123	}
	124
	125	/* Obtain client and file */
	126	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	127	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	128
	129	/* Now check for conflicting locks */
	130	resp->status = cast_status(nlmsvc_testlock(file, &argp->lock, &resp->lock));
	131
	132	dprintk("lockd: TEST status %d vers %d\n",
	133	ntohl(resp->status), rqstp->rq_vers);
	134	nlm_release_host(host);
	135	nlm_release_file(file);
	136	return rpc_success;
	137	}
	138
	139	static int
	140	nlmsvc_proc_lock(struct svc_rqst rqstp, struct nlm_args argp,
	141	struct nlm_res *resp)
	142	{
	143	struct nlm_host *host;
	144	struct nlm_file *file;
	145
	146	dprintk("lockd: LOCK called\n");
	147
	148	resp->cookie = argp->cookie;
	149
	150	/* Don't accept new lock requests during grace period */
	151	if (nlmsvc_grace_period && !argp->reclaim) {
	152	resp->status = nlm_lck_denied_grace_period;
	153	return rpc_success;
	154	}
	155
	156	/* Obtain client and file */
	157	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	158	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	159
	160	#if 0
	161	/* If supplied state doesn't match current state, we assume it's
	162	* an old request that time-warped somehow. Any error return would
	163	* do in this case because it's irrelevant anyway.
	164	*
	165	* NB: We don't retrieve the remote host's state yet.
	166	*/
	167	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	168	resp->status = nlm_lck_denied_nolocks;
	169	} else
	170	#endif
	171
	172	/* Now try to lock the file */
	173	resp->status = cast_status(nlmsvc_lock(rqstp, file, &argp->lock,
	174	argp->block, &argp->cookie));
	175
	176	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
	177	nlm_release_host(host);
	178	nlm_release_file(file);
	179	return rpc_success;
	180	}
	181
	182	static int
	183	nlmsvc_proc_cancel(struct svc_rqst rqstp, struct nlm_args argp,
	184	struct nlm_res *resp)
	185	{
	186	struct nlm_host *host;
	187	struct nlm_file *file;
	188
	189	dprintk("lockd: CANCEL called\n");
	190
	191	resp->cookie = argp->cookie;
	192
	193	/* Don't accept requests during grace period */
	194	if (nlmsvc_grace_period) {
	195	resp->status = nlm_lck_denied_grace_period;
	196	return rpc_success;
	197	}
	198
	199	/* Obtain client and file */
	200	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	201	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	202
	203	/* Try to cancel request. */
	204	resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock));
	205
	206	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
	207	nlm_release_host(host);
	208	nlm_release_file(file);
	209	return rpc_success;
	210	}
	211
	212	/*
	213	* UNLOCK: release a lock
	214	*/
	215	static int
	216	nlmsvc_proc_unlock(struct svc_rqst rqstp, struct nlm_args argp,
	217	struct nlm_res *resp)
	218	{
	219	struct nlm_host *host;
	220	struct nlm_file *file;
	221
	222	dprintk("lockd: UNLOCK called\n");
	223
	224	resp->cookie = argp->cookie;
	225
	226	/* Don't accept new lock requests during grace period */
	227	if (nlmsvc_grace_period) {
	228	resp->status = nlm_lck_denied_grace_period;
	229	return rpc_success;
	230	}
	231
	232	/* Obtain client and file */
	233	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	234	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	235
	236	/* Now try to remove the lock */
	237	resp->status = cast_status(nlmsvc_unlock(file, &argp->lock));
	238
	239	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
	240	nlm_release_host(host);
	241	nlm_release_file(file);
	242	return rpc_success;
	243	}
	244
	245	/*
	246	* GRANTED: A server calls us to tell that a process' lock request
	247	* was granted
	248	*/
	249	static int
	250	nlmsvc_proc_granted(struct svc_rqst rqstp, struct nlm_args argp,
	251	struct nlm_res *resp)
	252	{
	253	resp->cookie = argp->cookie;
	254
	255	dprintk("lockd: GRANTED called\n");
5ac5f9d1	256	resp->status = nlmclnt_grant(&rqstp->rq_addr, &argp->lock);
1da177e4 LT	257	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	258	return rpc_success;
	259	}
	260
d4716624 TM	261	/*
	262	* This is the generic lockd callback for async RPC calls
	263	*/
	264	static void nlmsvc_callback_exit(struct rpc_task task, void data)
	265	{
	266	dprintk("lockd: %4d callback returned %d\n", task->tk_pid,
	267	-task->tk_status);
	268	}
	269
	270	static void nlmsvc_callback_release(void *data)
	271	{
	272	nlm_release_call(data);
	273	}
	274
	275	static const struct rpc_call_ops nlmsvc_callback_ops = {
	276	.rpc_call_done = nlmsvc_callback_exit,
	277	.rpc_release = nlmsvc_callback_release,
	278	};
	279
1da177e4 LT	280	/*
	281	* `Async' versions of the above service routines. They aren't really,
	282	* because we send the callback before the reply proper. I hope this
	283	* doesn't break any clients.
	284	*/
d4716624 TM	285	static int nlmsvc_callback(struct svc_rqst rqstp, u32 proc, struct nlm_args argp,
d4716624 TM	286	int (func)(struct svc_rqst , struct nlm_args , struct nlm_res ))
1da177e4	287	{
d4716624 TM	288	struct nlm_host *host;
	289	struct nlm_rqst *call;
	290	int stat;
1da177e4	291
db4e4c9a OK	292	host = nlmsvc_lookup_host(rqstp,
	293	argp->lock.caller,
	294	argp->lock.len);
d4716624 TM	295	if (host == NULL)
	296	return rpc_system_err;
	297
	298	call = nlm_alloc_call(host);
	299	if (call == NULL)
	300	return rpc_system_err;
	301
	302	stat = func(rqstp, argp, &call->a_res);
	303	if (stat != 0) {
	304	nlm_release_call(call);
	305	return stat;
	306	}
1da177e4	307
d4716624 TM	308	call->a_flags = RPC_TASK_ASYNC;
	309	if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
	310	return rpc_system_err;
	311	return rpc_success;
1da177e4 LT	312	}
1da177e4 LT	313
d4716624	314	static int nlmsvc_proc_test_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	315	void *resp)
1da177e4 LT	316	{
d4716624 TM	317	dprintk("lockd: TEST_MSG called\n");
	318	return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test);
	319	}
1da177e4	320
d4716624 TM	321	static int nlmsvc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
	322	void *resp)
	323	{
1da177e4	324	dprintk("lockd: LOCK_MSG called\n");
d4716624	325	return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock);
1da177e4 LT	326	}
1da177e4 LT	327
d4716624	328	static int nlmsvc_proc_cancel_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	329	void *resp)
1da177e4 LT	330	{
1da177e4	331	dprintk("lockd: CANCEL_MSG called\n");
d4716624	332	return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel);
1da177e4 LT	333	}
	334
	335	static int
	336	nlmsvc_proc_unlock_msg(struct svc_rqst rqstp, struct nlm_args argp,
	337	void *resp)
	338	{
1da177e4	339	dprintk("lockd: UNLOCK_MSG called\n");
d4716624	340	return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock);
1da177e4 LT	341	}
	342
	343	static int
	344	nlmsvc_proc_granted_msg(struct svc_rqst rqstp, struct nlm_args argp,
	345	void *resp)
	346	{
1da177e4	347	dprintk("lockd: GRANTED_MSG called\n");
d4716624	348	return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted);
1da177e4 LT	349	}
	350
	351	/*
	352	* SHARE: create a DOS share or alter existing share.
	353	*/
	354	static int
	355	nlmsvc_proc_share(struct svc_rqst rqstp, struct nlm_args argp,
	356	struct nlm_res *resp)
	357	{
	358	struct nlm_host *host;
	359	struct nlm_file *file;
	360
	361	dprintk("lockd: SHARE called\n");
	362
	363	resp->cookie = argp->cookie;
	364
	365	/* Don't accept new lock requests during grace period */
	366	if (nlmsvc_grace_period && !argp->reclaim) {
	367	resp->status = nlm_lck_denied_grace_period;
	368	return rpc_success;
	369	}
	370
	371	/* Obtain client and file */
	372	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	373	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	374
	375	/* Now try to create the share */
	376	resp->status = cast_status(nlmsvc_share_file(host, file, argp));
	377
	378	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
	379	nlm_release_host(host);
	380	nlm_release_file(file);
	381	return rpc_success;
	382	}
	383
	384	/*
	385	* UNSHARE: Release a DOS share.
	386	*/
	387	static int
	388	nlmsvc_proc_unshare(struct svc_rqst rqstp, struct nlm_args argp,
	389	struct nlm_res *resp)
	390	{
	391	struct nlm_host *host;
	392	struct nlm_file *file;
	393
	394	dprintk("lockd: UNSHARE called\n");
	395
	396	resp->cookie = argp->cookie;
	397
	398	/* Don't accept requests during grace period */
	399	if (nlmsvc_grace_period) {
	400	resp->status = nlm_lck_denied_grace_period;
	401	return rpc_success;
	402	}
	403
	404	/* Obtain client and file */
	405	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	406	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	407
	408	/* Now try to unshare the file */
	409	resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
	410
	411	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
	412	nlm_release_host(host);
	413	nlm_release_file(file);
	414	return rpc_success;
	415	}
	416
	417	/*
	418	* NM_LOCK: Create an unmonitored lock
	419	*/
	420	static int
	421	nlmsvc_proc_nm_lock(struct svc_rqst rqstp, struct nlm_args argp,
	422	struct nlm_res *resp)
	423	{
	424	dprintk("lockd: NM_LOCK called\n");
	425
	426	argp->monitor = 0; /* just clean the monitor flag */
	427	return nlmsvc_proc_lock(rqstp, argp, resp);
	428	}
	429
	430	/*
	431	* FREE_ALL: Release all locks and shares held by client
	432	*/
	433	static int
	434	nlmsvc_proc_free_all(struct svc_rqst rqstp, struct nlm_args argp,
	435	void *resp)
	436	{
	437	struct nlm_host *host;
	438
	439	/* Obtain client */
	440	if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
	441	return rpc_success;
	442
	443	nlmsvc_free_host_resources(host);
	444	nlm_release_host(host);
	445	return rpc_success;
	446	}
	447
	448	/*
	449	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	450	*/
	451	static int
	452	nlmsvc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
	453	void *resp)
	454	{
	455	struct sockaddr_in saddr = rqstp->rq_addr;
1da177e4 LT	456
	457	dprintk("lockd: SM_NOTIFY called\n");
	458	if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
	459	\|\| ntohs(saddr.sin_port) >= 1024) {
	460	printk(KERN_WARNING
	461	"lockd: rejected NSM callback from %08x:%d\n",
	462	ntohl(rqstp->rq_addr.sin_addr.s_addr),
	463	ntohs(rqstp->rq_addr.sin_port));
	464	return rpc_system_err;
	465	}
	466
	467	/* Obtain the host pointer for this NFS server and try to
	468	* reclaim all locks we hold on this server.
	469	*/
cf712c24	470	memset(&saddr, 0, sizeof(saddr));
1da177e4	471	saddr.sin_addr.s_addr = argp->addr;
5c8dd29c	472	nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state);
1da177e4 LT	473
	474	return rpc_success;
	475	}
	476
	477	/*
	478	* client sent a GRANTED_RES, let's remove the associated block
	479	*/
	480	static int
	481	nlmsvc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
	482	void *resp)
	483	{
	484	if (!nlmsvc_ops)
	485	return rpc_success;
	486
	487	dprintk("lockd: GRANTED_RES called\n");
	488
39be4502	489	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	490	return rpc_success;
	491	}
	492
1da177e4 LT	493	/*
	494	* NLM Server procedures.
	495	*/
	496
	497	#define nlmsvc_encode_norep nlmsvc_encode_void
	498	#define nlmsvc_decode_norep nlmsvc_decode_void
	499	#define nlmsvc_decode_testres nlmsvc_decode_void
	500	#define nlmsvc_decode_lockres nlmsvc_decode_void
	501	#define nlmsvc_decode_unlockres nlmsvc_decode_void
	502	#define nlmsvc_decode_cancelres nlmsvc_decode_void
	503	#define nlmsvc_decode_grantedres nlmsvc_decode_void
	504
	505	#define nlmsvc_proc_none nlmsvc_proc_null
	506	#define nlmsvc_proc_test_res nlmsvc_proc_null
	507	#define nlmsvc_proc_lock_res nlmsvc_proc_null
	508	#define nlmsvc_proc_cancel_res nlmsvc_proc_null
	509	#define nlmsvc_proc_unlock_res nlmsvc_proc_null
	510
	511	struct nlm_void { int dummy; };
	512
	513	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	514	{ .pc_func = (svc_procfunc) nlmsvc_proc_##name, \
	515	.pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \
	516	.pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \
	517	.pc_release = NULL, \
	518	.pc_argsize = sizeof(struct nlm_##argt), \
	519	.pc_ressize = sizeof(struct nlm_##rest), \
	520	.pc_xdrressize = respsize, \
	521	}
	522
	523	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	524	#define St 1 /* status */
	525	#define No (1+1024/4) /* Net Obj */
	526	#define Rg 2 /* range - offset + size */
	527
	528	struct svc_procedure nlmsvc_procedures[] = {
	529	PROC(null, void, void, void, void, 1),
	530	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	531	PROC(lock, lockargs, res, args, res, Ck+St),
	532	PROC(cancel, cancargs, res, args, res, Ck+St),
	533	PROC(unlock, unlockargs, res, args, res, Ck+St),
	534	PROC(granted, testargs, res, args, res, Ck+St),
	535	PROC(test_msg, testargs, norep, args, void, 1),
	536	PROC(lock_msg, lockargs, norep, args, void, 1),
	537	PROC(cancel_msg, cancargs, norep, args, void, 1),
	538	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	539	PROC(granted_msg, testargs, norep, args, void, 1),
	540	PROC(test_res, testres, norep, res, void, 1),
	541	PROC(lock_res, lockres, norep, res, void, 1),
	542	PROC(cancel_res, cancelres, norep, res, void, 1),
	543	PROC(unlock_res, unlockres, norep, res, void, 1),
	544	PROC(granted_res, res, norep, res, void, 1),
	545	/* statd callback */
	546	PROC(sm_notify, reboot, void, reboot, void, 1),
	547	PROC(none, void, void, void, void, 1),
	548	PROC(none, void, void, void, void, 1),
	549	PROC(none, void, void, void, void, 1),
	550	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	551	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	552	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	553	PROC(free_all, notify, void, args, void, 0),
	554
	555	};