[linux-block.git] / fs / lockd / svc4proc.c

/*
 * linux/fs/lockd/svc4proc.c
 *
 * Lockd server procedures. We don't implement the NLM_*_RES 
 * procedures because we don't use the async procedures.
 *
 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
 */

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

/*
 * Obtain client and file from arguments
 */
static u32
nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
			struct nlm_host **hostp, struct nlm_file **filp)
{
	struct nlm_host		*host = NULL;
	struct nlm_file		*file = NULL;
	struct nlm_lock		*lock = &argp->lock;
	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))
	 || (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
nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
	dprintk("lockd: NULL          called\n");
	return rpc_success;
}

/*
 * TEST: Check for conflicting lock
 */
static int
nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
				         struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

	dprintk("lockd: TEST4        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 = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return rpc_success;

	/* Now check for conflicting locks */
	resp->status = nlmsvc_testlock(file, &argp->lock, &resp->lock);

	dprintk("lockd: TEST4          status %d\n", ntohl(resp->status));
	nlm_release_host(host);
	nlm_release_file(file);
	return rpc_success;
}

static int
nlm4svc_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 = nlm4svc_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 = 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
nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
				           struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

	dprintk("lockd: CANCEL        called\n");

	resp->cookie = argp->cookie;

	/* Don't accept requests during grace period */
	if (nlmsvc_grace_period) {
		resp->status = nlm_lck_denied_grace_period;
		return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return rpc_success;

	/* Try to cancel request. */
	resp->status = nlmsvc_cancel_blocked(file, &argp->lock);

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

/*
 * UNLOCK: release a lock
 */
static int
nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
				           struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

	dprintk("lockd: UNLOCK        called\n");

	resp->cookie = argp->cookie;

	/* Don't accept new lock requests during grace period */
	if (nlmsvc_grace_period) {
		resp->status = nlm_lck_denied_grace_period;
		return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return rpc_success;

	/* Now try to remove the lock */
	resp->status = nlmsvc_unlock(file, &argp->lock);

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

/*
 * GRANTED: A server calls us to tell that a process' lock request
 * was granted
 */
static int
nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
				            struct nlm_res  *resp)
{
	resp->cookie = argp->cookie;

	dprintk("lockd: GRANTED       called\n");
	resp->status = nlmclnt_grant(&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 nlm4svc_callback_exit(struct rpc_task *task, void *data)
{
	dprintk("lockd: %4d callback returned %d\n", task->tk_pid,
			-task->tk_status);
}

static void nlm4svc_callback_release(void *data)
{
	nlm_release_call(data);
}

static const struct rpc_call_ops nlm4svc_callback_ops = {
	.rpc_call_done = nlm4svc_callback_exit,
	.rpc_release = nlm4svc_callback_release,
};

/*
 * `Async' versions of the above service routines. They aren't really,
 * because we send the callback before the reply proper. I hope this
 * doesn't break any clients.
 */
static int nlm4svc_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, &nlm4svc_callback_ops) < 0)
		return rpc_system_err;
	return rpc_success;
}

static int nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
					     void	     *resp)
{
	dprintk("lockd: TEST_MSG      called\n");
	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
}

static int nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
					     void	     *resp)
{
	dprintk("lockd: LOCK_MSG      called\n");
	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
}

static int nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
					       void	       *resp)
{
	dprintk("lockd: CANCEL_MSG    called\n");
	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
}

static int nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
                                               void            *resp)
{
	dprintk("lockd: UNLOCK_MSG    called\n");
	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
}

static int nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
                                                void            *resp)
{
	dprintk("lockd: GRANTED_MSG   called\n");
	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
}

/*
 * SHARE: create a DOS share or alter existing share.
 */
static int
nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
				          struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

	dprintk("lockd: SHARE         called\n");

	resp->cookie = argp->cookie;

	/* Don't accept new lock requests during grace period */
	if (nlmsvc_grace_period && !argp->reclaim) {
		resp->status = nlm_lck_denied_grace_period;
		return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return rpc_success;

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

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

/*
 * UNSHARE: Release a DOS share.
 */
static int
nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
				            struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

	dprintk("lockd: UNSHARE       called\n");

	resp->cookie = argp->cookie;

	/* Don't accept requests during grace period */
	if (nlmsvc_grace_period) {
		resp->status = nlm_lck_denied_grace_period;
		return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return rpc_success;

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

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

/*
 * NM_LOCK: Create an unmonitored lock
 */
static int
nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
				            struct nlm_res  *resp)
{
	dprintk("lockd: NM_LOCK       called\n");

	argp->monitor = 0;		/* just clean the monitor flag */
	return nlm4svc_proc_lock(rqstp, argp, resp);
}

/*
 * FREE_ALL: Release all locks and shares held by client
 */
static int
nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
					     void            *resp)
{
	struct nlm_host	*host;

	/* Obtain client */
	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
		return rpc_success;

	nlmsvc_free_host_resources(host);
	nlm_release_host(host);
	return rpc_success;
}

/*
 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
 */
static int
nlm4svc_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);

	return rpc_success;
}

/*
 * client sent a GRANTED_RES, let's remove the associated block
 */
static int
nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res  *argp,
                                                void            *resp)
{
        if (!nlmsvc_ops)
                return rpc_success;

        dprintk("lockd: GRANTED_RES   called\n");

        nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status);
        return rpc_success;
}


/*
 * NLM Server procedures.
 */

#define nlm4svc_encode_norep	nlm4svc_encode_void
#define nlm4svc_decode_norep	nlm4svc_decode_void
#define nlm4svc_decode_testres	nlm4svc_decode_void
#define nlm4svc_decode_lockres	nlm4svc_decode_void
#define nlm4svc_decode_unlockres	nlm4svc_decode_void
#define nlm4svc_decode_cancelres	nlm4svc_decode_void
#define nlm4svc_decode_grantedres	nlm4svc_decode_void

#define nlm4svc_proc_none	nlm4svc_proc_null
#define nlm4svc_proc_test_res	nlm4svc_proc_null
#define nlm4svc_proc_lock_res	nlm4svc_proc_null
#define nlm4svc_proc_cancel_res	nlm4svc_proc_null
#define nlm4svc_proc_unlock_res	nlm4svc_proc_null

struct nlm_void			{ int dummy; };

#define PROC(name, xargt, xrest, argt, rest, respsize)	\
 { .pc_func	= (svc_procfunc) nlm4svc_proc_##name,	\
   .pc_decode	= (kxdrproc_t) nlm4svc_decode_##xargt,	\
   .pc_encode	= (kxdrproc_t) nlm4svc_encode_##xrest,	\
   .pc_release	= NULL,					\
   .pc_argsize	= sizeof(struct nlm_##argt),		\
   .pc_ressize	= sizeof(struct nlm_##rest),		\
   .pc_xdrressize = respsize,				\
 }
#define	Ck	(1+XDR_QUADLEN(NLM_MAXCOOKIELEN))	/* cookie */
#define	No	(1+1024/4)				/* netobj */
#define	St	1					/* status */
#define	Rg	4					/* range (offset + length) */
struct svc_procedure		nlmsvc_procedures4[] = {
  PROC(null,		void,		void,		void,	void, 1),
  PROC(test,		testargs,	testres,	args,	res, Ck+St+2+No+Rg),
  PROC(lock,		lockargs,	res,		args,	res, Ck+St),
  PROC(cancel,		cancargs,	res,		args,	res, Ck+St),
  PROC(unlock,		unlockargs,	res,		args,	res, Ck+St),
  PROC(granted,		testargs,	res,		args,	res, Ck+St),
  PROC(test_msg,	testargs,	norep,		args,	void, 1),
  PROC(lock_msg,	lockargs,	norep,		args,	void, 1),
  PROC(cancel_msg,	cancargs,	norep,		args,	void, 1),
  PROC(unlock_msg,	unlockargs,	norep,		args,	void, 1),
  PROC(granted_msg,	testargs,	norep,		args,	void, 1),
  PROC(test_res,	testres,	norep,		res,	void, 1),
  PROC(lock_res,	lockres,	norep,		res,	void, 1),
  PROC(cancel_res,	cancelres,	norep,		res,	void, 1),
  PROC(unlock_res,	unlockres,	norep,		res,	void, 1),
  PROC(granted_res,	res,		norep,		res,	void, 1),
  /* statd callback */
  PROC(sm_notify,	reboot,		void,		reboot,	void, 1),
  PROC(none,		void,		void,		void,	void, 0),
  PROC(none,		void,		void,		void,	void, 0),
  PROC(none,		void,		void,		void,	void, 0),
  PROC(share,		shareargs,	shareres,	args,	res, Ck+St+1),
  PROC(unshare,		shareargs,	shareres,	args,	res, Ck+St+1),
  PROC(nm_lock,		lockargs,	res,		args,	res, Ck+St),
  PROC(free_all,	notify,		void,		args,	void, 1),

};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/lockd/svc4proc.c
	3	*
	4	* Lockd server procedures. We don't implement the NLM_*_RES
	5	* procedures because we don't use the async procedures.
	6	*
	7	* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
	8	*/
	9
	10	#include <linux/types.h>
	11	#include <linux/time.h>
	12	#include <linux/slab.h>
	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	/*
	25	* Obtain client and file from arguments
	26	*/
	27	static u32
	28	nlm4svc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	29	struct nlm_host hostp, struct nlm_file filp)
	30	{
	31	struct nlm_host *host = NULL;
	32	struct nlm_file *file = NULL;
	33	struct nlm_lock *lock = &argp->lock;
	34	u32 error = 0;
	35
	36	/* nfsd callbacks must have been installed for this procedure */
	37	if (!nlmsvc_ops)
	38	return nlm_lck_denied_nolocks;
	39
	40	/* Obtain host handle */
	41	if (!(host = nlmsvc_lookup_host(rqstp))
977faf39	42	\|\| (argp->monitor && nsm_monitor(host) < 0))
1da177e4 LT	43	goto no_locks;
	44	*hostp = host;
	45
	46	/* Obtain file pointer. Not used by FREE_ALL call. */
	47	if (filp != NULL) {
	48	if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
	49	goto no_locks;
	50	*filp = file;
	51
	52	/* Set up the missing parts of the file_lock structure */
	53	lock->fl.fl_file = file->f_file;
	54	lock->fl.fl_owner = (fl_owner_t) host;
	55	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	56	}
	57
	58	return 0;
	59
	60	no_locks:
	61	if (host)
	62	nlm_release_host(host);
	63	if (error)
	64	return error;
	65	return nlm_lck_denied_nolocks;
	66	}
	67
	68	/*
	69	* NULL: Test for presence of service
	70	*/
	71	static int
	72	nlm4svc_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	73	{
	74	dprintk("lockd: NULL called\n");
	75	return rpc_success;
	76	}
	77
	78	/*
	79	* TEST: Check for conflicting lock
	80	*/
	81	static int
	82	nlm4svc_proc_test(struct svc_rqst rqstp, struct nlm_args argp,
	83	struct nlm_res *resp)
	84	{
	85	struct nlm_host *host;
	86	struct nlm_file *file;
	87
	88	dprintk("lockd: TEST4 called\n");
	89	resp->cookie = argp->cookie;
	90
	91	/* Don't accept test requests during grace period */
	92	if (nlmsvc_grace_period) {
	93	resp->status = nlm_lck_denied_grace_period;
	94	return rpc_success;
	95	}
	96
	97	/* Obtain client and file */
	98	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
	99	return rpc_success;
	100
	101	/* Now check for conflicting locks */
	102	resp->status = nlmsvc_testlock(file, &argp->lock, &resp->lock);
	103
	104	dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
	105	nlm_release_host(host);
	106	nlm_release_file(file);
107	return rpc_success;
108	}
109
110	static int
111	nlm4svc_proc_lock(struct svc_rqst rqstp, struct nlm_args argp,
112	struct nlm_res *resp)
113	{
114	struct nlm_host *host;
115	struct nlm_file *file;
116
117	dprintk("lockd: LOCK called\n");
118
119	resp->cookie = argp->cookie;
120
121	/* Don't accept new lock requests during grace period */
122	if (nlmsvc_grace_period && !argp->reclaim) {
123	resp->status = nlm_lck_denied_grace_period;
124	return rpc_success;
125	}
126
127	/* Obtain client and file */
128	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
129	return rpc_success;
130
131	#if 0
132	/* If supplied state doesn't match current state, we assume it's
133	* an old request that time-warped somehow. Any error return would
134	* do in this case because it's irrelevant anyway.
135	*
136	* NB: We don't retrieve the remote host's state yet.
137	*/
138	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
139	resp->status = nlm_lck_denied_nolocks;
140	} else
141	#endif
142
143	/* Now try to lock the file */
144	resp->status = nlmsvc_lock(rqstp, file, &argp->lock,
145	argp->block, &argp->cookie);
146
147	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
148	nlm_release_host(host);
149	nlm_release_file(file);
150	return rpc_success;
151	}
152
153	static int
154	nlm4svc_proc_cancel(struct svc_rqst rqstp, struct nlm_args argp,
155	struct nlm_res *resp)
156	{
157	struct nlm_host *host;
158	struct nlm_file *file;
159
160	dprintk("lockd: CANCEL called\n");
161
162	resp->cookie = argp->cookie;
163
164	/* Don't accept requests during grace period */
165	if (nlmsvc_grace_period) {
166	resp->status = nlm_lck_denied_grace_period;
167	return rpc_success;
168	}
169
170	/* Obtain client and file */
171	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
172	return rpc_success;
173
174	/* Try to cancel request. */
175	resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
176
177	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
178	nlm_release_host(host);
179	nlm_release_file(file);
180	return rpc_success;
181	}
182
183	/*
184	* UNLOCK: release a lock
185	*/
186	static int
187	nlm4svc_proc_unlock(struct svc_rqst rqstp, struct nlm_args argp,
188	struct nlm_res *resp)
189	{
190	struct nlm_host *host;
191	struct nlm_file *file;
192
193	dprintk("lockd: UNLOCK called\n");
194
195	resp->cookie = argp->cookie;
196
197	/* Don't accept new lock requests during grace period */
198	if (nlmsvc_grace_period) {
199	resp->status = nlm_lck_denied_grace_period;
200	return rpc_success;
201	}
202
203	/* Obtain client and file */
204	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
205	return rpc_success;
206
207	/* Now try to remove the lock */
208	resp->status = nlmsvc_unlock(file, &argp->lock);
209
210	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
211	nlm_release_host(host);
212	nlm_release_file(file);
213	return rpc_success;
214	}
215
216	/*
217	* GRANTED: A server calls us to tell that a process' lock request
218	* was granted
219	*/
220	static int
221	nlm4svc_proc_granted(struct svc_rqst rqstp, struct nlm_args argp,
222	struct nlm_res *resp)
223	{
224	resp->cookie = argp->cookie;
225
226	dprintk("lockd: GRANTED called\n");
5ac5f9d1	227	resp->status = nlmclnt_grant(&rqstp->rq_addr, &argp->lock);
1da177e4 LT	228	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	229	return rpc_success;
	230	}
	231
d4716624 TM	232	/*
	233	* This is the generic lockd callback for async RPC calls
	234	*/
	235	static void nlm4svc_callback_exit(struct rpc_task task, void data)
	236	{
	237	dprintk("lockd: %4d callback returned %d\n", task->tk_pid,
	238	-task->tk_status);
	239	}
	240
	241	static void nlm4svc_callback_release(void *data)
	242	{
	243	nlm_release_call(data);
	244	}
	245
	246	static const struct rpc_call_ops nlm4svc_callback_ops = {
	247	.rpc_call_done = nlm4svc_callback_exit,
	248	.rpc_release = nlm4svc_callback_release,
	249	};
	250
1da177e4 LT	251	/*
	252	* `Async' versions of the above service routines. They aren't really,
	253	* because we send the callback before the reply proper. I hope this
	254	* doesn't break any clients.
	255	*/
d4716624 TM	256	static int nlm4svc_callback(struct svc_rqst rqstp, u32 proc, struct nlm_args argp,
d4716624 TM	257	int (func)(struct svc_rqst , struct nlm_args , struct nlm_res ))
1da177e4	258	{
d4716624 TM	259	struct nlm_host *host;
	260	struct nlm_rqst *call;
	261	int stat;
1da177e4	262
d4716624 TM	263	host = nlmsvc_lookup_host(rqstp);
	264	if (host == NULL)
	265	return rpc_system_err;
	266
	267	call = nlm_alloc_call(host);
	268	if (call == NULL)
	269	return rpc_system_err;
	270
	271	stat = func(rqstp, argp, &call->a_res);
	272	if (stat != 0) {
	273	nlm_release_call(call);
	274	return stat;
	275	}
1da177e4	276
d4716624 TM	277	call->a_flags = RPC_TASK_ASYNC;
	278	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
	279	return rpc_system_err;
	280	return rpc_success;
1da177e4 LT	281	}
1da177e4 LT	282
d4716624	283	static int nlm4svc_proc_test_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	284	void *resp)
1da177e4 LT	285	{
d4716624 TM	286	dprintk("lockd: TEST_MSG called\n");
	287	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
	288	}
1da177e4	289
d4716624 TM	290	static int nlm4svc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
	291	void *resp)
	292	{
1da177e4	293	dprintk("lockd: LOCK_MSG called\n");
d4716624	294	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
1da177e4 LT	295	}
1da177e4 LT	296
d4716624	297	static int nlm4svc_proc_cancel_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	298	void *resp)
1da177e4 LT	299	{
1da177e4	300	dprintk("lockd: CANCEL_MSG called\n");
d4716624	301	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
1da177e4 LT	302	}
1da177e4 LT	303
d4716624	304	static int nlm4svc_proc_unlock_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	305	void *resp)
1da177e4 LT	306	{
1da177e4	307	dprintk("lockd: UNLOCK_MSG called\n");
d4716624	308	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
1da177e4 LT	309	}
1da177e4 LT	310
d4716624	311	static int nlm4svc_proc_granted_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	312	void *resp)
1da177e4 LT	313	{
1da177e4	314	dprintk("lockd: GRANTED_MSG called\n");
d4716624	315	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
1da177e4 LT	316	}
	317
	318	/*
	319	* SHARE: create a DOS share or alter existing share.
	320	*/
	321	static int
	322	nlm4svc_proc_share(struct svc_rqst rqstp, struct nlm_args argp,
	323	struct nlm_res *resp)
	324	{
	325	struct nlm_host *host;
	326	struct nlm_file *file;
	327
	328	dprintk("lockd: SHARE called\n");
	329
	330	resp->cookie = argp->cookie;
	331
	332	/* Don't accept new lock requests during grace period */
	333	if (nlmsvc_grace_period && !argp->reclaim) {
	334	resp->status = nlm_lck_denied_grace_period;
	335	return rpc_success;
	336	}
	337
	338	/* Obtain client and file */
	339	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
	340	return rpc_success;
	341
	342	/* Now try to create the share */
	343	resp->status = nlmsvc_share_file(host, file, argp);
	344
	345	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
	346	nlm_release_host(host);
	347	nlm_release_file(file);
	348	return rpc_success;
	349	}
	350
	351	/*
	352	* UNSHARE: Release a DOS share.
	353	*/
	354	static int
	355	nlm4svc_proc_unshare(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: UNSHARE called\n");
	362
	363	resp->cookie = argp->cookie;
	364
	365	/* Don't accept requests during grace period */
	366	if (nlmsvc_grace_period) {
	367	resp->status = nlm_lck_denied_grace_period;
	368	return rpc_success;
	369	}
	370
	371	/* Obtain client and file */
	372	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
	373	return rpc_success;
	374
	375	/* Now try to lock the file */
	376	resp->status = nlmsvc_unshare_file(host, file, argp);
	377
	378	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
	379	nlm_release_host(host);
380	nlm_release_file(file);
381	return rpc_success;
382	}
383
384	/*
385	* NM_LOCK: Create an unmonitored lock
386	*/
387	static int
388	nlm4svc_proc_nm_lock(struct svc_rqst rqstp, struct nlm_args argp,
389	struct nlm_res *resp)
390	{
391	dprintk("lockd: NM_LOCK called\n");
392
393	argp->monitor = 0; /* just clean the monitor flag */
394	return nlm4svc_proc_lock(rqstp, argp, resp);
395	}
396
397	/*
398	* FREE_ALL: Release all locks and shares held by client
399	*/
400	static int
401	nlm4svc_proc_free_all(struct svc_rqst rqstp, struct nlm_args argp,
402	void *resp)
403	{
404	struct nlm_host *host;
405
406	/* Obtain client */
407	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
408	return rpc_success;
409
410	nlmsvc_free_host_resources(host);
411	nlm_release_host(host);
412	return rpc_success;
413	}
414
415	/*
416	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
417	*/
418	static int
419	nlm4svc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
420	void *resp)
421	{
422	struct sockaddr_in saddr = rqstp->rq_addr;
1da177e4 LT	423
	424	dprintk("lockd: SM_NOTIFY called\n");
	425	if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
	426	\|\| ntohs(saddr.sin_port) >= 1024) {
	427	printk(KERN_WARNING
	428	"lockd: rejected NSM callback from %08x:%d\n",
	429	ntohl(rqstp->rq_addr.sin_addr.s_addr),
	430	ntohs(rqstp->rq_addr.sin_port));
	431	return rpc_system_err;
	432	}
	433
	434	/* Obtain the host pointer for this NFS server and try to
	435	* reclaim all locks we hold on this server.
	436	*/
cf712c24	437	memset(&saddr, 0, sizeof(saddr));
1da177e4	438	saddr.sin_addr.s_addr = argp->addr;
cf712c24	439	nlm_host_rebooted(&saddr, argp);
1da177e4	440
1da177e4 LT	441	return rpc_success;
	442	}
	443
	444	/*
	445	* client sent a GRANTED_RES, let's remove the associated block
	446	*/
	447	static int
	448	nlm4svc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
	449	void *resp)
	450	{
	451	if (!nlmsvc_ops)
	452	return rpc_success;
	453
	454	dprintk("lockd: GRANTED_RES called\n");
	455
	456	nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status);
	457	return rpc_success;
	458	}
	459
	460
1da177e4 LT	461	/*
	462	* NLM Server procedures.
	463	*/
	464
	465	#define nlm4svc_encode_norep nlm4svc_encode_void
	466	#define nlm4svc_decode_norep nlm4svc_decode_void
	467	#define nlm4svc_decode_testres nlm4svc_decode_void
	468	#define nlm4svc_decode_lockres nlm4svc_decode_void
	469	#define nlm4svc_decode_unlockres nlm4svc_decode_void
	470	#define nlm4svc_decode_cancelres nlm4svc_decode_void
	471	#define nlm4svc_decode_grantedres nlm4svc_decode_void
	472
	473	#define nlm4svc_proc_none nlm4svc_proc_null
	474	#define nlm4svc_proc_test_res nlm4svc_proc_null
	475	#define nlm4svc_proc_lock_res nlm4svc_proc_null
	476	#define nlm4svc_proc_cancel_res nlm4svc_proc_null
	477	#define nlm4svc_proc_unlock_res nlm4svc_proc_null
	478
	479	struct nlm_void { int dummy; };
	480
	481	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	482	{ .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
	483	.pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
	484	.pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
	485	.pc_release = NULL, \
	486	.pc_argsize = sizeof(struct nlm_##argt), \
	487	.pc_ressize = sizeof(struct nlm_##rest), \
	488	.pc_xdrressize = respsize, \
	489	}
	490	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	491	#define No (1+1024/4) /* netobj */
	492	#define St 1 /* status */
	493	#define Rg 4 /* range (offset + length) */
	494	struct svc_procedure nlmsvc_procedures4[] = {
	495	PROC(null, void, void, void, void, 1),
	496	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	497	PROC(lock, lockargs, res, args, res, Ck+St),
	498	PROC(cancel, cancargs, res, args, res, Ck+St),
	499	PROC(unlock, unlockargs, res, args, res, Ck+St),
	500	PROC(granted, testargs, res, args, res, Ck+St),
	501	PROC(test_msg, testargs, norep, args, void, 1),
	502	PROC(lock_msg, lockargs, norep, args, void, 1),
	503	PROC(cancel_msg, cancargs, norep, args, void, 1),
	504	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	505	PROC(granted_msg, testargs, norep, args, void, 1),
	506	PROC(test_res, testres, norep, res, void, 1),
	507	PROC(lock_res, lockres, norep, res, void, 1),
	508	PROC(cancel_res, cancelres, norep, res, void, 1),
	509	PROC(unlock_res, unlockres, norep, res, void, 1),
	510	PROC(granted_res, res, norep, res, void, 1),
	511	/* statd callback */
	512	PROC(sm_notify, reboot, void, reboot, void, 1),
	513	PROC(none, void, void, void, void, 0),
	514	PROC(none, void, void, void, void, 0),
	515	PROC(none, void, void, void, void, 0),
	516	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	517	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	518	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	519	PROC(free_all, notify, void, args, void, 1),
	520
	521	};