[people/ms/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 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;

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