[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))
	 || (argp->monitor && !host->h_monitored && 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);
	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;
	int			vers = argp->vers;
	int			prot = argp->proto >> 1;
	struct nlm_host		*host;

	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.
	 */
	saddr.sin_addr.s_addr = argp->addr;
	if ((argp->proto & 1)==0) {
		if ((host = nlmclnt_lookup_host(&saddr, prot, vers)) != NULL) {
			nlmclnt_recovery(host, argp->state);
			nlm_release_host(host);
		}
	} else {
		/* If we run on an NFS server, delete all locks held by the client */
		if ((host = nlm_lookup_host(1, &saddr, prot, vers)) != NULL) {
			nlmsvc_free_host_resources(host);
			nlm_release_host(host);
		}
	}

	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 */
	69	if (!(host = nlmsvc_lookup_host(rqstp))
	70	\|\| (argp->monitor && !host->h_monitored && nsm_monitor(host) < 0))
	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
d4716624 TM	290	host = nlmsvc_lookup_host(rqstp);
	291	if (host == NULL)
	292	return rpc_system_err;
	293
	294	call = nlm_alloc_call(host);
	295	if (call == NULL)
	296	return rpc_system_err;
	297
	298	stat = func(rqstp, argp, &call->a_res);
	299	if (stat != 0) {
	300	nlm_release_call(call);
	301	return stat;
	302	}
1da177e4	303
d4716624 TM	304	call->a_flags = RPC_TASK_ASYNC;
	305	if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
	306	return rpc_system_err;
	307	return rpc_success;
1da177e4 LT	308	}
1da177e4 LT	309
d4716624	310	static int nlmsvc_proc_test_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	311	void *resp)
1da177e4 LT	312	{
d4716624 TM	313	dprintk("lockd: TEST_MSG called\n");
	314	return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test);
	315	}
1da177e4	316
d4716624 TM	317	static int nlmsvc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
	318	void *resp)
	319	{
1da177e4	320	dprintk("lockd: LOCK_MSG called\n");
d4716624	321	return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock);
1da177e4 LT	322	}
1da177e4 LT	323
d4716624	324	static int nlmsvc_proc_cancel_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	325	void *resp)
1da177e4 LT	326	{
1da177e4	327	dprintk("lockd: CANCEL_MSG called\n");
d4716624	328	return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel);
1da177e4 LT	329	}
	330
	331	static int
	332	nlmsvc_proc_unlock_msg(struct svc_rqst rqstp, struct nlm_args argp,
	333	void *resp)
	334	{
1da177e4	335	dprintk("lockd: UNLOCK_MSG called\n");
d4716624	336	return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock);
1da177e4 LT	337	}
	338
	339	static int
	340	nlmsvc_proc_granted_msg(struct svc_rqst rqstp, struct nlm_args argp,
	341	void *resp)
	342	{
1da177e4	343	dprintk("lockd: GRANTED_MSG called\n");
d4716624	344	return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted);
1da177e4 LT	345	}
	346
	347	/*
	348	* SHARE: create a DOS share or alter existing share.
	349	*/
	350	static int
	351	nlmsvc_proc_share(struct svc_rqst rqstp, struct nlm_args argp,
	352	struct nlm_res *resp)
	353	{
	354	struct nlm_host *host;
	355	struct nlm_file *file;
	356
	357	dprintk("lockd: SHARE called\n");
	358
	359	resp->cookie = argp->cookie;
	360
	361	/* Don't accept new lock requests during grace period */
	362	if (nlmsvc_grace_period && !argp->reclaim) {
	363	resp->status = nlm_lck_denied_grace_period;
	364	return rpc_success;
	365	}
	366
	367	/* Obtain client and file */
	368	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
	369	return rpc_success;
	370
	371	/* Now try to create the share */
	372	resp->status = cast_status(nlmsvc_share_file(host, file, argp));
	373
	374	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
	375	nlm_release_host(host);
	376	nlm_release_file(file);
	377	return rpc_success;
	378	}
	379
	380	/*
	381	* UNSHARE: Release a DOS share.
	382	*/
	383	static int
	384	nlmsvc_proc_unshare(struct svc_rqst rqstp, struct nlm_args argp,
	385	struct nlm_res *resp)
	386	{
	387	struct nlm_host *host;
	388	struct nlm_file *file;
	389
	390	dprintk("lockd: UNSHARE called\n");
	391
	392	resp->cookie = argp->cookie;
	393
	394	/* Don't accept requests during grace period */
	395	if (nlmsvc_grace_period) {
	396	resp->status = nlm_lck_denied_grace_period;
	397	return rpc_success;
	398	}
	399
	400	/* Obtain client and file */
	401	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
	402	return rpc_success;
	403
	404	/* Now try to unshare the file */
	405	resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
	406
	407	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
	408	nlm_release_host(host);
409	nlm_release_file(file);
410	return rpc_success;
411	}
412
413	/*
414	* NM_LOCK: Create an unmonitored lock
415	*/
416	static int
417	nlmsvc_proc_nm_lock(struct svc_rqst rqstp, struct nlm_args argp,
418	struct nlm_res *resp)
419	{
420	dprintk("lockd: NM_LOCK called\n");
421
422	argp->monitor = 0; /* just clean the monitor flag */
423	return nlmsvc_proc_lock(rqstp, argp, resp);
424	}
425
426	/*
427	* FREE_ALL: Release all locks and shares held by client
428	*/
429	static int
430	nlmsvc_proc_free_all(struct svc_rqst rqstp, struct nlm_args argp,
431	void *resp)
432	{
433	struct nlm_host *host;
434
435	/* Obtain client */
436	if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
437	return rpc_success;
438
439	nlmsvc_free_host_resources(host);
440	nlm_release_host(host);
441	return rpc_success;
442	}
443
444	/*
445	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
446	*/
447	static int
448	nlmsvc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
449	void *resp)
450	{
451	struct sockaddr_in saddr = rqstp->rq_addr;
452	int vers = argp->vers;
453	int prot = argp->proto >> 1;
454	struct nlm_host *host;
455
456	dprintk("lockd: SM_NOTIFY called\n");
457	if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
458	\|\| ntohs(saddr.sin_port) >= 1024) {
459	printk(KERN_WARNING
460	"lockd: rejected NSM callback from %08x:%d\n",
461	ntohl(rqstp->rq_addr.sin_addr.s_addr),
462	ntohs(rqstp->rq_addr.sin_port));
463	return rpc_system_err;
464	}
465
466	/* Obtain the host pointer for this NFS server and try to
467	* reclaim all locks we hold on this server.
468	*/
469	saddr.sin_addr.s_addr = argp->addr;
470	if ((argp->proto & 1)==0) {
471	if ((host = nlmclnt_lookup_host(&saddr, prot, vers)) != NULL) {
472	nlmclnt_recovery(host, argp->state);
473	nlm_release_host(host);
474	}
475	} else {
476	/* If we run on an NFS server, delete all locks held by the client */
477	if ((host = nlm_lookup_host(1, &saddr, prot, vers)) != NULL) {
478	nlmsvc_free_host_resources(host);
479	nlm_release_host(host);
480	}
481	}
482
483	return rpc_success;
484	}
485
486	/*
487	* client sent a GRANTED_RES, let's remove the associated block
488	*/
489	static int
490	nlmsvc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
491	void *resp)
492	{
493	if (!nlmsvc_ops)
494	return rpc_success;
495
496	dprintk("lockd: GRANTED_RES called\n");
497
498	nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status);
499	return rpc_success;
500	}
501
1da177e4 LT	502	/*
	503	* NLM Server procedures.
	504	*/
	505
	506	#define nlmsvc_encode_norep nlmsvc_encode_void
	507	#define nlmsvc_decode_norep nlmsvc_decode_void
	508	#define nlmsvc_decode_testres nlmsvc_decode_void
	509	#define nlmsvc_decode_lockres nlmsvc_decode_void
	510	#define nlmsvc_decode_unlockres nlmsvc_decode_void
	511	#define nlmsvc_decode_cancelres nlmsvc_decode_void
	512	#define nlmsvc_decode_grantedres nlmsvc_decode_void
	513
	514	#define nlmsvc_proc_none nlmsvc_proc_null
	515	#define nlmsvc_proc_test_res nlmsvc_proc_null
	516	#define nlmsvc_proc_lock_res nlmsvc_proc_null
	517	#define nlmsvc_proc_cancel_res nlmsvc_proc_null
	518	#define nlmsvc_proc_unlock_res nlmsvc_proc_null
	519
	520	struct nlm_void { int dummy; };
	521
	522	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	523	{ .pc_func = (svc_procfunc) nlmsvc_proc_##name, \
	524	.pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \
	525	.pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \
	526	.pc_release = NULL, \
	527	.pc_argsize = sizeof(struct nlm_##argt), \
	528	.pc_ressize = sizeof(struct nlm_##rest), \
	529	.pc_xdrressize = respsize, \
	530	}
	531
	532	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	533	#define St 1 /* status */
	534	#define No (1+1024/4) /* Net Obj */
	535	#define Rg 2 /* range - offset + size */
	536
	537	struct svc_procedure nlmsvc_procedures[] = {
	538	PROC(null, void, void, void, void, 1),
	539	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	540	PROC(lock, lockargs, res, args, res, Ck+St),
	541	PROC(cancel, cancargs, res, args, res, Ck+St),
	542	PROC(unlock, unlockargs, res, args, res, Ck+St),
	543	PROC(granted, testargs, res, args, res, Ck+St),
	544	PROC(test_msg, testargs, norep, args, void, 1),
	545	PROC(lock_msg, lockargs, norep, args, void, 1),
	546	PROC(cancel_msg, cancargs, norep, args, void, 1),
	547	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	548	PROC(granted_msg, testargs, norep, args, void, 1),
	549	PROC(test_res, testres, norep, res, void, 1),
	550	PROC(lock_res, lockres, norep, res, void, 1),
	551	PROC(cancel_res, cancelres, norep, res, void, 1),
	552	PROC(unlock_res, unlockres, norep, res, void, 1),
	553	PROC(granted_res, res, norep, res, void, 1),
	554	/* statd callback */
	555	PROC(sm_notify, reboot, void, reboot, void, 1),
	556	PROC(none, void, void, void, void, 1),
	557	PROC(none, void, void, void, void, 1),
	558	PROC(none, void, void, void, void, 1),
	559	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	560	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	561	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	562	PROC(free_all, notify, void, args, void, 0),
	563
	564	};