[GitHub/mt8127/android_kernel_alcatel_ttab.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 __be32
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;
	__be32			error = 0;

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

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

	/* Obtain file pointer. Not used by FREE_ALL call. */
	if (filp != NULL) {
		if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
			goto no_locks;
		*filp = file;

		/* Set up the missing parts of the file_lock structure */
		lock->fl.fl_file  = file->f_file;
		lock->fl.fl_owner = (fl_owner_t) host;
		lock->fl.fl_lmops = &nlmsvc_lock_operations;
	}

	return 0;

no_locks:
	nlm_release_host(host);
 	if (error)
		return error;	
	return nlm_lck_denied_nolocks;
}

/*
 * NULL: Test for presence of service
 */
static __be32
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 __be32
nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
				         struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;
	__be32 rc = rpc_success;

	dprintk("lockd: TEST4        called\n");
	resp->cookie = argp->cookie;

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

	/* Now check for conflicting locks */
	resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
	if (resp->status == nlm_drop_reply)
		rc = rpc_drop_reply;
	else
		dprintk("lockd: TEST4        status %d\n", ntohl(resp->status));

	nlm_release_host(host);
	nlm_release_file(file);
	return rc;
}

static __be32
nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
				         struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;
	__be32 rc = rpc_success;

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

	resp->cookie = argp->cookie;

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

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

	/* Now try to lock the file */
	resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
					argp->block, &argp->cookie,
					argp->reclaim);
	if (resp->status == nlm_drop_reply)
		rc = rpc_drop_reply;
	else
		dprintk("lockd: LOCK         status %d\n", ntohl(resp->status));

	nlm_release_host(host);
	nlm_release_file(file);
	return rc;
}

static __be32
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 (locks_in_grace()) {
		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 resp->status == nlm_drop_reply ? rpc_drop_reply :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 __be32
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 (locks_in_grace()) {
		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 resp->status == nlm_drop_reply ? rpc_drop_reply :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 __be32
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(svc_addr_in(rqstp), &argp->lock);
	dprintk("lockd: GRANTED       status %d\n", ntohl(resp->status));
	return rpc_success;
}

/*
 * This is the generic lockd callback for async RPC calls
 */
static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
{
	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
			-task->tk_status);
}

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

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 __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
		__be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res  *))
{
	struct nlm_host	*host;
	struct nlm_rqst	*call;
	__be32 stat;

	host = nlmsvc_lookup_host(rqstp,
				  argp->lock.caller,
				  argp->lock.len);
	if (host == NULL)
		return rpc_system_err;

	call = nlm_alloc_call(host);
	if (call == NULL)
		return rpc_system_err;

	stat = func(rqstp, argp, &call->a_res);
	if (stat != 0) {
		nlm_release_call(call);
		return stat;
	}

	call->a_flags = RPC_TASK_ASYNC;
	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
		return rpc_system_err;
	return rpc_success;
}

static __be32 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 __be32 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 __be32 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 __be32 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 __be32 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 __be32
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 (locks_in_grace() && !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 resp->status == nlm_drop_reply ? rpc_drop_reply :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 __be32
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 (locks_in_grace()) {
		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 resp->status == nlm_drop_reply ? rpc_drop_reply :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 __be32
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 __be32
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 __be32
nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
					      void	        *resp)
{
	struct sockaddr_in	saddr;

	memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr));

	dprintk("lockd: SM_NOTIFY     called\n");
	if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
	 || ntohs(saddr.sin_port) >= 1024) {
		char buf[RPC_MAX_ADDRBUFLEN];
		printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
				svc_print_addr(rqstp, buf, sizeof(buf)));
		return rpc_system_err;
	}

	/* Obtain the host pointer for this NFS server and try to
	 * reclaim all locks we hold on this server.
	 */
	memset(&saddr, 0, sizeof(saddr));
	saddr.sin_addr.s_addr = argp->addr;
	nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state);

	return rpc_success;
}

/*
 * client sent a GRANTED_RES, let's remove the associated block
 */
static __be32
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(&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	*/
52921e02	27	static __be32
1da177e4 LT	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;
52921e02	34	__be32 error = 0;
1da177e4 LT	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 */
db4e4c9a	41	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
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:
b0e92aae	61	nlm_release_host(host);
1da177e4 LT	62	if (error)
	63	return error;
	64	return nlm_lck_denied_nolocks;
	65	}
	66
	67	/*
	68	* NULL: Test for presence of service
	69	*/
7111c66e	70	static __be32
1da177e4 LT	71	nlm4svc_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	72	{
	73	dprintk("lockd: NULL called\n");
	74	return rpc_success;
	75	}
	76
	77	/*
	78	* TEST: Check for conflicting lock
	79	*/
7111c66e	80	static __be32
1da177e4 LT	81	nlm4svc_proc_test(struct svc_rqst rqstp, struct nlm_args argp,
	82	struct nlm_res *resp)
	83	{
	84	struct nlm_host *host;
	85	struct nlm_file *file;
317602f3	86	__be32 rc = rpc_success;
1da177e4 LT	87
	88	dprintk("lockd: TEST4 called\n");
	89	resp->cookie = argp->cookie;
	90
1da177e4 LT	91	/* Obtain client and file */
1da177e4 LT	92	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	93	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	94
1da177e4 LT	95	/* Now check for conflicting locks */
8f920d5e	96	resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
5ea0d750	97	if (resp->status == nlm_drop_reply)
b7e6b869 OD	98	rc = rpc_drop_reply;
	99	else
	100	dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
1da177e4	101
1da177e4 LT	102	nlm_release_host(host);
1da177e4 LT	103	nlm_release_file(file);
b7e6b869	104	return rc;
1da177e4 LT	105	}
1da177e4 LT	106
7111c66e	107	static __be32
1da177e4 LT	108	nlm4svc_proc_lock(struct svc_rqst rqstp, struct nlm_args argp,
	109	struct nlm_res *resp)
	110	{
	111	struct nlm_host *host;
	112	struct nlm_file *file;
317602f3	113	__be32 rc = rpc_success;
1da177e4 LT	114
	115	dprintk("lockd: LOCK called\n");
	116
	117	resp->cookie = argp->cookie;
	118
1da177e4 LT	119	/* Obtain client and file */
1da177e4 LT	120	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	121	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	122
	123	#if 0
	124	/* If supplied state doesn't match current state, we assume it's
	125	* an old request that time-warped somehow. Any error return would
	126	* do in this case because it's irrelevant anyway.
	127	*
	128	* NB: We don't retrieve the remote host's state yet.
	129	*/
	130	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	131	resp->status = nlm_lck_denied_nolocks;
	132	} else
	133	#endif
	134
	135	/* Now try to lock the file */
6cde4de8	136	resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
b2b50289 BF	137	argp->block, &argp->cookie,
b2b50289 BF	138	argp->reclaim);
1a8322b2	139	if (resp->status == nlm_drop_reply)
b7e6b869 OD	140	rc = rpc_drop_reply;
	141	else
	142	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
1da177e4	143
1da177e4 LT	144	nlm_release_host(host);
1da177e4 LT	145	nlm_release_file(file);
b7e6b869	146	return rc;
1da177e4 LT	147	}
1da177e4 LT	148
7111c66e	149	static __be32
1da177e4 LT	150	nlm4svc_proc_cancel(struct svc_rqst rqstp, struct nlm_args argp,
	151	struct nlm_res *resp)
	152	{
	153	struct nlm_host *host;
	154	struct nlm_file *file;
	155
	156	dprintk("lockd: CANCEL called\n");
	157
	158	resp->cookie = argp->cookie;
	159
	160	/* Don't accept requests during grace period */
af558e33	161	if (locks_in_grace()) {
1da177e4 LT	162	resp->status = nlm_lck_denied_grace_period;
	163	return rpc_success;
	164	}
	165
	166	/* Obtain client and file */
	167	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	168	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	169
	170	/* Try to cancel request. */
	171	resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
	172
	173	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
	174	nlm_release_host(host);
	175	nlm_release_file(file);
	176	return rpc_success;
	177	}
	178
	179	/*
	180	* UNLOCK: release a lock
	181	*/
7111c66e	182	static __be32
1da177e4 LT	183	nlm4svc_proc_unlock(struct svc_rqst rqstp, struct nlm_args argp,
	184	struct nlm_res *resp)
	185	{
	186	struct nlm_host *host;
	187	struct nlm_file *file;
	188
	189	dprintk("lockd: UNLOCK called\n");
	190
	191	resp->cookie = argp->cookie;
	192
	193	/* Don't accept new lock requests during grace period */
af558e33	194	if (locks_in_grace()) {
1da177e4 LT	195	resp->status = nlm_lck_denied_grace_period;
	196	return rpc_success;
	197	}
	198
	199	/* Obtain client and file */
	200	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	201	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	202
	203	/* Now try to remove the lock */
	204	resp->status = nlmsvc_unlock(file, &argp->lock);
	205
	206	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
	207	nlm_release_host(host);
	208	nlm_release_file(file);
	209	return rpc_success;
	210	}
	211
	212	/*
	213	* GRANTED: A server calls us to tell that a process' lock request
	214	* was granted
	215	*/
7111c66e	216	static __be32
1da177e4 LT	217	nlm4svc_proc_granted(struct svc_rqst rqstp, struct nlm_args argp,
	218	struct nlm_res *resp)
	219	{
	220	resp->cookie = argp->cookie;
	221
	222	dprintk("lockd: GRANTED called\n");
27459f09	223	resp->status = nlmclnt_grant(svc_addr_in(rqstp), &argp->lock);
1da177e4 LT	224	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	225	return rpc_success;
	226	}
	227
d4716624 TM	228	/*
	229	* This is the generic lockd callback for async RPC calls
	230	*/
	231	static void nlm4svc_callback_exit(struct rpc_task task, void data)
	232	{
c041b5ff	233	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	234	-task->tk_status);
	235	}
	236
	237	static void nlm4svc_callback_release(void *data)
	238	{
a86dc496	239	lock_kernel();
d4716624	240	nlm_release_call(data);
a86dc496	241	unlock_kernel();
d4716624 TM	242	}
	243
	244	static const struct rpc_call_ops nlm4svc_callback_ops = {
	245	.rpc_call_done = nlm4svc_callback_exit,
	246	.rpc_release = nlm4svc_callback_release,
	247	};
	248
1da177e4 LT	249	/*
	250	* `Async' versions of the above service routines. They aren't really,
	251	* because we send the callback before the reply proper. I hope this
	252	* doesn't break any clients.
	253	*/
7111c66e AV	254	static __be32 nlm4svc_callback(struct svc_rqst rqstp, u32 proc, struct nlm_args argp,
7111c66e AV	255	__be32 (func)(struct svc_rqst , struct nlm_args , struct nlm_res ))
1da177e4	256	{
d4716624 TM	257	struct nlm_host *host;
d4716624 TM	258	struct nlm_rqst *call;
7111c66e	259	__be32 stat;
1da177e4	260
db4e4c9a OK	261	host = nlmsvc_lookup_host(rqstp,
	262	argp->lock.caller,
	263	argp->lock.len);
d4716624 TM	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
7111c66e	283	static __be32 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
7111c66e	290	static __be32 nlm4svc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
d4716624 TM	291	void *resp)
d4716624 TM	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
7111c66e	297	static __be32 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
7111c66e	304	static __be32 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
7111c66e	311	static __be32 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	*/
7111c66e	321	static __be32
1da177e4 LT	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 */
af558e33	333	if (locks_in_grace() && !argp->reclaim) {
1da177e4 LT	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)))
d343fce1	340	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	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	*/
7111c66e	354	static __be32
1da177e4 LT	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 */
af558e33	366	if (locks_in_grace()) {
1da177e4 LT	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)))
d343fce1	373	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	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	*/
7111c66e	387	static __be32
1da177e4 LT	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	*/
7111c66e	400	static __be32
1da177e4 LT	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	*/
7111c66e	418	static __be32
1da177e4 LT	419	nlm4svc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
	420	void *resp)
	421	{
27459f09 CL	422	struct sockaddr_in saddr;
	423
	424	memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr));
1da177e4 LT	425
	426	dprintk("lockd: SM_NOTIFY called\n");
	427	if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
	428	\|\| ntohs(saddr.sin_port) >= 1024) {
ad06e4bd CL	429	char buf[RPC_MAX_ADDRBUFLEN];
	430	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	431	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	432	return rpc_system_err;
	433	}
	434
	435	/* Obtain the host pointer for this NFS server and try to
	436	* reclaim all locks we hold on this server.
	437	*/
cf712c24	438	memset(&saddr, 0, sizeof(saddr));
1da177e4	439	saddr.sin_addr.s_addr = argp->addr;
5c8dd29c	440	nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state);
1da177e4	441
1da177e4 LT	442	return rpc_success;
	443	}
	444
	445	/*
	446	* client sent a GRANTED_RES, let's remove the associated block
	447	*/
7111c66e	448	static __be32
1da177e4 LT	449	nlm4svc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
	450	void *resp)
	451	{
	452	if (!nlmsvc_ops)
	453	return rpc_success;
	454
	455	dprintk("lockd: GRANTED_RES called\n");
	456
39be4502	457	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	458	return rpc_success;
	459	}
	460
	461
1da177e4 LT	462	/*
	463	* NLM Server procedures.
	464	*/
	465
	466	#define nlm4svc_encode_norep nlm4svc_encode_void
	467	#define nlm4svc_decode_norep nlm4svc_decode_void
	468	#define nlm4svc_decode_testres nlm4svc_decode_void
	469	#define nlm4svc_decode_lockres nlm4svc_decode_void
	470	#define nlm4svc_decode_unlockres nlm4svc_decode_void
	471	#define nlm4svc_decode_cancelres nlm4svc_decode_void
	472	#define nlm4svc_decode_grantedres nlm4svc_decode_void
	473
	474	#define nlm4svc_proc_none nlm4svc_proc_null
	475	#define nlm4svc_proc_test_res nlm4svc_proc_null
	476	#define nlm4svc_proc_lock_res nlm4svc_proc_null
	477	#define nlm4svc_proc_cancel_res nlm4svc_proc_null
	478	#define nlm4svc_proc_unlock_res nlm4svc_proc_null
	479
	480	struct nlm_void { int dummy; };
	481
	482	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	483	{ .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
	484	.pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
	485	.pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
	486	.pc_release = NULL, \
	487	.pc_argsize = sizeof(struct nlm_##argt), \
	488	.pc_ressize = sizeof(struct nlm_##rest), \
	489	.pc_xdrressize = respsize, \
	490	}
	491	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	492	#define No (1+1024/4) /* netobj */
	493	#define St 1 /* status */
	494	#define Rg 4 /* range (offset + length) */
	495	struct svc_procedure nlmsvc_procedures4[] = {
	496	PROC(null, void, void, void, void, 1),
	497	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	498	PROC(lock, lockargs, res, args, res, Ck+St),
	499	PROC(cancel, cancargs, res, args, res, Ck+St),
	500	PROC(unlock, unlockargs, res, args, res, Ck+St),
	501	PROC(granted, testargs, res, args, res, Ck+St),
	502	PROC(test_msg, testargs, norep, args, void, 1),
	503	PROC(lock_msg, lockargs, norep, args, void, 1),
	504	PROC(cancel_msg, cancargs, norep, args, void, 1),
	505	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	506	PROC(granted_msg, testargs, norep, args, void, 1),
	507	PROC(test_res, testres, norep, res, void, 1),
	508	PROC(lock_res, lockres, norep, res, void, 1),
	509	PROC(cancel_res, cancelres, norep, res, void, 1),
	510	PROC(unlock_res, unlockres, norep, res, void, 1),
	511	PROC(granted_res, res, norep, res, void, 1),
	512	/* statd callback */
	513	PROC(sm_notify, reboot, void, reboot, void, 1),
	514	PROC(none, void, void, void, void, 0),
	515	PROC(none, void, void, void, void, 0),
	516	PROC(none, void, void, void, void, 0),
	517	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	518	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	519	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	520	PROC(free_all, notify, void, args, void, 1),
	521
	522	};