[mirror_ubuntu-artful-kernel.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/lockd/lockd.h>
#include <linux/lockd/share.h>
#include <linux/sunrpc/svc_xprt.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:
	nlmsvc_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)
{
	dprintk("lockd: NULL          called\n");
	return rpc_success;
}

/*
 * TEST: Check for conflicting lock
 */
static __be32
__nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_res *resp)
{
	struct nlm_args *argp = rqstp->rq_argp;
	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));

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

static __be32
nlm4svc_proc_test(struct svc_rqst *rqstp)
{
	return __nlm4svc_proc_test(rqstp, rqstp->rq_resp);
}

static __be32
__nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_res *resp)
{
	struct nlm_args *argp = rqstp->rq_argp;
	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));

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

static __be32
nlm4svc_proc_lock(struct svc_rqst *rqstp)
{
	return __nlm4svc_proc_lock(rqstp, rqstp->rq_resp);
}

static __be32
__nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_res *resp)
{
	struct nlm_args *argp = rqstp->rq_argp;
	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(SVC_NET(rqstp))) {
		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(SVC_NET(rqstp), file, &argp->lock);

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

static __be32
nlm4svc_proc_cancel(struct svc_rqst *rqstp)
{
	return __nlm4svc_proc_cancel(rqstp, rqstp->rq_resp);
}

/*
 * UNLOCK: release a lock
 */
static __be32
__nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_res *resp)
{
	struct nlm_args *argp = rqstp->rq_argp;
	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(SVC_NET(rqstp))) {
		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(SVC_NET(rqstp), file, &argp->lock);

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

static __be32
nlm4svc_proc_unlock(struct svc_rqst *rqstp)
{
	return __nlm4svc_proc_unlock(rqstp, rqstp->rq_resp);
}

/*
 * 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_res *resp)
{
	struct nlm_args *argp = rqstp->rq_argp;

	resp->cookie = argp->cookie;

	dprintk("lockd: GRANTED       called\n");
	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
	dprintk("lockd: GRANTED       status %d\n", ntohl(resp->status));
	return rpc_success;
}

static __be32
nlm4svc_proc_granted(struct svc_rqst *rqstp)
{
	return __nlm4svc_proc_granted(rqstp, rqstp->rq_resp);
}

/*
 * 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)
{
	nlmsvc_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 __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc,
		__be32 (*func)(struct svc_rqst *,  struct nlm_res *))
{
	struct nlm_args *argp = rqstp->rq_argp;
	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);
	nlmsvc_release_host(host);
	if (call == NULL)
		return rpc_system_err;

	stat = func(rqstp, &call->a_res);
	if (stat != 0) {
		nlmsvc_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)
{
	dprintk("lockd: TEST_MSG      called\n");
	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, __nlm4svc_proc_test);
}

static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp)
{
	dprintk("lockd: LOCK_MSG      called\n");
	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, __nlm4svc_proc_lock);
}

static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp)
{
	dprintk("lockd: CANCEL_MSG    called\n");
	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, __nlm4svc_proc_cancel);
}

static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp)
{
	dprintk("lockd: UNLOCK_MSG    called\n");
	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlm4svc_proc_unlock);
}

static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp)
{
	dprintk("lockd: GRANTED_MSG   called\n");
	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, __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 = rqstp->rq_argp;
	struct nlm_res *resp = rqstp->rq_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(SVC_NET(rqstp)) && !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));
	nlmsvc_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 = rqstp->rq_argp;
	struct nlm_res *resp = rqstp->rq_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(SVC_NET(rqstp))) {
		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));
	nlmsvc_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 = rqstp->rq_argp;

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

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

/*
 * FREE_ALL: Release all locks and shares held by client
 */
static __be32
nlm4svc_proc_free_all(struct svc_rqst *rqstp)
{
	struct nlm_args *argp = rqstp->rq_argp;
	struct nlm_host	*host;

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

	nlmsvc_free_host_resources(host);
	nlmsvc_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 = rqstp->rq_argp;

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

	if (!nlm_privileged_requester(rqstp)) {
		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;
	}

	nlm_host_rebooted(SVC_NET(rqstp), argp);
	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 = rqstp->rq_argp;

        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	= nlm4svc_proc_##name,	\
   .pc_decode	= nlm4svc_decode_##xargt,	\
   .pc_encode	= 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) */
const 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>
1da177e4 LT	12	#include <linux/lockd/lockd.h>
1da177e4 LT	13	#include <linux/lockd/share.h>
5ccb0066	14	#include <linux/sunrpc/svc_xprt.h>
1da177e4 LT	15
	16	#define NLMDBG_FACILITY NLMDBG_CLIENT
	17
1da177e4 LT	18	/*
	19	* Obtain client and file from arguments
	20	*/
52921e02	21	static __be32
1da177e4 LT	22	nlm4svc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	23	struct nlm_host hostp, struct nlm_file filp)
	24	{
	25	struct nlm_host *host = NULL;
	26	struct nlm_file *file = NULL;
	27	struct nlm_lock *lock = &argp->lock;
52921e02	28	__be32 error = 0;
1da177e4 LT	29
	30	/* nfsd callbacks must have been installed for this procedure */
	31	if (!nlmsvc_ops)
	32	return nlm_lck_denied_nolocks;
	33
	34	/* Obtain host handle */
db4e4c9a	35	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
977faf39	36	\|\| (argp->monitor && nsm_monitor(host) < 0))
1da177e4 LT	37	goto no_locks;
	38	*hostp = host;
	39
	40	/* Obtain file pointer. Not used by FREE_ALL call. */
	41	if (filp != NULL) {
	42	if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
	43	goto no_locks;
	44	*filp = file;
	45
	46	/* Set up the missing parts of the file_lock structure */
	47	lock->fl.fl_file = file->f_file;
	48	lock->fl.fl_owner = (fl_owner_t) host;
	49	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	50	}
	51
	52	return 0;
	53
	54	no_locks:
67216b94	55	nlmsvc_release_host(host);
1da177e4 LT	56	if (error)
	57	return error;
	58	return nlm_lck_denied_nolocks;
	59	}
	60
	61	/*
	62	* NULL: Test for presence of service
	63	*/
7111c66e	64	static __be32
a6beb732	65	nlm4svc_proc_null(struct svc_rqst *rqstp)
1da177e4 LT	66	{
	67	dprintk("lockd: NULL called\n");
	68	return rpc_success;
	69	}
	70
	71	/*
	72	* TEST: Check for conflicting lock
	73	*/
7111c66e	74	static __be32
a6beb732	75	__nlm4svc_proc_test(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	76	{
a6beb732	77	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	78	struct nlm_host *host;
1da177e4 LT	79	struct nlm_file *file;
317602f3	80	__be32 rc = rpc_success;
1da177e4 LT	81
	82	dprintk("lockd: TEST4 called\n");
	83	resp->cookie = argp->cookie;
	84
1da177e4 LT	85	/* Obtain client and file */
1da177e4 LT	86	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	87	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	88
1da177e4 LT	89	/* Now check for conflicting locks */
8f920d5e	90	resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
5ea0d750	91	if (resp->status == nlm_drop_reply)
b7e6b869 OD	92	rc = rpc_drop_reply;
	93	else
	94	dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
1da177e4	95
67216b94	96	nlmsvc_release_host(host);
1da177e4	97	nlm_release_file(file);
b7e6b869	98	return rc;
1da177e4 LT	99	}
1da177e4 LT	100
7111c66e	101	static __be32
a6beb732	102	nlm4svc_proc_test(struct svc_rqst *rqstp)
1da177e4	103	{
a6beb732 CH	104	return __nlm4svc_proc_test(rqstp, rqstp->rq_resp);
	105	}
	106
	107	static __be32
	108	__nlm4svc_proc_lock(struct svc_rqst rqstp, struct nlm_res resp)
	109	{
	110	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	111	struct nlm_host *host;
1da177e4 LT	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
67216b94	144	nlmsvc_release_host(host);
1da177e4	145	nlm_release_file(file);
b7e6b869	146	return rc;
1da177e4 LT	147	}
1da177e4 LT	148
7111c66e	149	static __be32
a6beb732 CH	150	nlm4svc_proc_lock(struct svc_rqst *rqstp)
	151	{
	152	return __nlm4svc_proc_lock(rqstp, rqstp->rq_resp);
	153	}
	154
	155	static __be32
	156	__nlm4svc_proc_cancel(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	157	{
a6beb732	158	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	159	struct nlm_host *host;
	160	struct nlm_file *file;
	161
	162	dprintk("lockd: CANCEL called\n");
	163
	164	resp->cookie = argp->cookie;
	165
	166	/* Don't accept requests during grace period */
5ccb0066	167	if (locks_in_grace(SVC_NET(rqstp))) {
1da177e4 LT	168	resp->status = nlm_lck_denied_grace_period;
	169	return rpc_success;
	170	}
	171
	172	/* Obtain client and file */
	173	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	174	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	175
1da177e4 LT	176	/* Try to cancel request. */
5ccb0066	177	resp->status = nlmsvc_cancel_blocked(SVC_NET(rqstp), file, &argp->lock);
1da177e4 LT	178
1da177e4 LT	179	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
67216b94	180	nlmsvc_release_host(host);
1da177e4 LT	181	nlm_release_file(file);
	182	return rpc_success;
	183	}
	184
a6beb732 CH	185	static __be32
	186	nlm4svc_proc_cancel(struct svc_rqst *rqstp)
	187	{
	188	return __nlm4svc_proc_cancel(rqstp, rqstp->rq_resp);
	189	}
	190
1da177e4 LT	191	/*
	192	* UNLOCK: release a lock
	193	*/
7111c66e	194	static __be32
a6beb732	195	__nlm4svc_proc_unlock(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	196	{
a6beb732	197	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	198	struct nlm_host *host;
	199	struct nlm_file *file;
	200
	201	dprintk("lockd: UNLOCK called\n");
	202
	203	resp->cookie = argp->cookie;
	204
	205	/* Don't accept new lock requests during grace period */
5ccb0066	206	if (locks_in_grace(SVC_NET(rqstp))) {
1da177e4 LT	207	resp->status = nlm_lck_denied_grace_period;
	208	return rpc_success;
	209	}
	210
	211	/* Obtain client and file */
	212	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	213	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	214
1da177e4 LT	215	/* Now try to remove the lock */
5ccb0066	216	resp->status = nlmsvc_unlock(SVC_NET(rqstp), file, &argp->lock);
1da177e4 LT	217
1da177e4 LT	218	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
67216b94	219	nlmsvc_release_host(host);
1da177e4 LT	220	nlm_release_file(file);
	221	return rpc_success;
	222	}
	223
a6beb732 CH	224	static __be32
	225	nlm4svc_proc_unlock(struct svc_rqst *rqstp)
	226	{
	227	return __nlm4svc_proc_unlock(rqstp, rqstp->rq_resp);
	228	}
	229
1da177e4 LT	230	/*
	231	* GRANTED: A server calls us to tell that a process' lock request
	232	* was granted
	233	*/
7111c66e	234	static __be32
a6beb732	235	__nlm4svc_proc_granted(struct svc_rqst rqstp, struct nlm_res resp)
1da177e4	236	{
a6beb732 CH	237	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	238
1da177e4 LT	239	resp->cookie = argp->cookie;
	240
	241	dprintk("lockd: GRANTED called\n");
dcff09f1	242	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
1da177e4 LT	243	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	244	return rpc_success;
	245	}
	246
a6beb732 CH	247	static __be32
	248	nlm4svc_proc_granted(struct svc_rqst *rqstp)
	249	{
	250	return __nlm4svc_proc_granted(rqstp, rqstp->rq_resp);
	251	}
	252
d4716624 TM	253	/*
	254	* This is the generic lockd callback for async RPC calls
	255	*/
	256	static void nlm4svc_callback_exit(struct rpc_task task, void data)
	257	{
c041b5ff	258	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	259	-task->tk_status);
	260	}
	261
	262	static void nlm4svc_callback_release(void *data)
	263	{
7db836d4	264	nlmsvc_release_call(data);
d4716624 TM	265	}
	266
	267	static const struct rpc_call_ops nlm4svc_callback_ops = {
	268	.rpc_call_done = nlm4svc_callback_exit,
	269	.rpc_release = nlm4svc_callback_release,
	270	};
	271
1da177e4 LT	272	/*
	273	* `Async' versions of the above service routines. They aren't really,
	274	* because we send the callback before the reply proper. I hope this
	275	* doesn't break any clients.
	276	*/
a6beb732 CH	277	static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc,
a6beb732 CH	278	__be32 (func)(struct svc_rqst , struct nlm_res *))
1da177e4	279	{
a6beb732	280	struct nlm_args *argp = rqstp->rq_argp;
d4716624 TM	281	struct nlm_host *host;
d4716624 TM	282	struct nlm_rqst *call;
7111c66e	283	__be32 stat;
1da177e4	284
db4e4c9a OK	285	host = nlmsvc_lookup_host(rqstp,
	286	argp->lock.caller,
	287	argp->lock.len);
d4716624 TM	288	if (host == NULL)
	289	return rpc_system_err;
	290
	291	call = nlm_alloc_call(host);
446945ab	292	nlmsvc_release_host(host);
d4716624 TM	293	if (call == NULL)
	294	return rpc_system_err;
	295
a6beb732	296	stat = func(rqstp, &call->a_res);
d4716624	297	if (stat != 0) {
7db836d4	298	nlmsvc_release_call(call);
d4716624 TM	299	return stat;
d4716624 TM	300	}
1da177e4	301
d4716624 TM	302	call->a_flags = RPC_TASK_ASYNC;
	303	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
	304	return rpc_system_err;
	305	return rpc_success;
1da177e4 LT	306	}
1da177e4 LT	307
a6beb732	308	static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp)
1da177e4	309	{
d4716624	310	dprintk("lockd: TEST_MSG called\n");
a6beb732	311	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, __nlm4svc_proc_test);
d4716624	312	}
1da177e4	313
a6beb732	314	static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp)
d4716624	315	{
1da177e4	316	dprintk("lockd: LOCK_MSG called\n");
a6beb732	317	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, __nlm4svc_proc_lock);
1da177e4 LT	318	}
1da177e4 LT	319
a6beb732	320	static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp)
1da177e4	321	{
1da177e4	322	dprintk("lockd: CANCEL_MSG called\n");
a6beb732	323	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, __nlm4svc_proc_cancel);
1da177e4 LT	324	}
1da177e4 LT	325
a6beb732	326	static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp)
1da177e4	327	{
1da177e4	328	dprintk("lockd: UNLOCK_MSG called\n");
a6beb732	329	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlm4svc_proc_unlock);
1da177e4 LT	330	}
1da177e4 LT	331
a6beb732	332	static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp)
1da177e4	333	{
1da177e4	334	dprintk("lockd: GRANTED_MSG called\n");
a6beb732	335	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, __nlm4svc_proc_granted);
1da177e4 LT	336	}
	337
	338	/*
	339	* SHARE: create a DOS share or alter existing share.
	340	*/
7111c66e	341	static __be32
a6beb732	342	nlm4svc_proc_share(struct svc_rqst *rqstp)
1da177e4	343	{
a6beb732 CH	344	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	345	struct nlm_res *resp = rqstp->rq_resp;
1da177e4 LT	346	struct nlm_host *host;
	347	struct nlm_file *file;
	348
	349	dprintk("lockd: SHARE called\n");
	350
	351	resp->cookie = argp->cookie;
	352
	353	/* Don't accept new lock requests during grace period */
5ccb0066	354	if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
1da177e4 LT	355	resp->status = nlm_lck_denied_grace_period;
	356	return rpc_success;
	357	}
	358
	359	/* Obtain client and file */
	360	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	361	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	362
	363	/* Now try to create the share */
	364	resp->status = nlmsvc_share_file(host, file, argp);
	365
	366	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
67216b94	367	nlmsvc_release_host(host);
1da177e4 LT	368	nlm_release_file(file);
	369	return rpc_success;
	370	}
	371
	372	/*
	373	* UNSHARE: Release a DOS share.
	374	*/
7111c66e	375	static __be32
a6beb732	376	nlm4svc_proc_unshare(struct svc_rqst *rqstp)
1da177e4	377	{
a6beb732 CH	378	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	379	struct nlm_res *resp = rqstp->rq_resp;
1da177e4 LT	380	struct nlm_host *host;
	381	struct nlm_file *file;
	382
	383	dprintk("lockd: UNSHARE called\n");
	384
	385	resp->cookie = argp->cookie;
	386
	387	/* Don't accept requests during grace period */
5ccb0066	388	if (locks_in_grace(SVC_NET(rqstp))) {
1da177e4 LT	389	resp->status = nlm_lck_denied_grace_period;
	390	return rpc_success;
	391	}
	392
	393	/* Obtain client and file */
	394	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	395	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	396
	397	/* Now try to lock the file */
	398	resp->status = nlmsvc_unshare_file(host, file, argp);
	399
	400	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
67216b94	401	nlmsvc_release_host(host);
1da177e4 LT	402	nlm_release_file(file);
	403	return rpc_success;
	404	}
	405
	406	/*
	407	* NM_LOCK: Create an unmonitored lock
	408	*/
7111c66e	409	static __be32
a6beb732	410	nlm4svc_proc_nm_lock(struct svc_rqst *rqstp)
1da177e4	411	{
a6beb732 CH	412	struct nlm_args *argp = rqstp->rq_argp;
a6beb732 CH	413
1da177e4 LT	414	dprintk("lockd: NM_LOCK called\n");
	415
	416	argp->monitor = 0; /* just clean the monitor flag */
a6beb732	417	return nlm4svc_proc_lock(rqstp);
1da177e4 LT	418	}
	419
	420	/*
	421	* FREE_ALL: Release all locks and shares held by client
	422	*/
7111c66e	423	static __be32
a6beb732	424	nlm4svc_proc_free_all(struct svc_rqst *rqstp)
1da177e4	425	{
a6beb732	426	struct nlm_args *argp = rqstp->rq_argp;
1da177e4 LT	427	struct nlm_host *host;
	428
	429	/* Obtain client */
	430	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
	431	return rpc_success;
	432
	433	nlmsvc_free_host_resources(host);
67216b94	434	nlmsvc_release_host(host);
1da177e4 LT	435	return rpc_success;
	436	}
	437
	438	/*
	439	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	440	*/
7111c66e	441	static __be32
a6beb732	442	nlm4svc_proc_sm_notify(struct svc_rqst *rqstp)
1da177e4	443	{
a6beb732 CH	444	struct nlm_reboot *argp = rqstp->rq_argp;
a6beb732 CH	445
1da177e4	446	dprintk("lockd: SM_NOTIFY called\n");
b85e4676 CL	447
b85e4676 CL	448	if (!nlm_privileged_requester(rqstp)) {
ad06e4bd CL	449	char buf[RPC_MAX_ADDRBUFLEN];
	450	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	451	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	452	return rpc_system_err;
	453	}
	454
0ad95472	455	nlm_host_rebooted(SVC_NET(rqstp), argp);
1da177e4 LT	456	return rpc_success;
	457	}
	458
	459	/*
	460	* client sent a GRANTED_RES, let's remove the associated block
	461	*/
7111c66e	462	static __be32
a6beb732	463	nlm4svc_proc_granted_res(struct svc_rqst *rqstp)
1da177e4	464	{
a6beb732 CH	465	struct nlm_res *argp = rqstp->rq_argp;
a6beb732 CH	466
1da177e4 LT	467	if (!nlmsvc_ops)
	468	return rpc_success;
	469
	470	dprintk("lockd: GRANTED_RES called\n");
	471
39be4502	472	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	473	return rpc_success;
	474	}
	475
	476
1da177e4 LT	477	/*
	478	* NLM Server procedures.
	479	*/
	480
	481	#define nlm4svc_encode_norep nlm4svc_encode_void
	482	#define nlm4svc_decode_norep nlm4svc_decode_void
	483	#define nlm4svc_decode_testres nlm4svc_decode_void
	484	#define nlm4svc_decode_lockres nlm4svc_decode_void
	485	#define nlm4svc_decode_unlockres nlm4svc_decode_void
	486	#define nlm4svc_decode_cancelres nlm4svc_decode_void
	487	#define nlm4svc_decode_grantedres nlm4svc_decode_void
	488
	489	#define nlm4svc_proc_none nlm4svc_proc_null
	490	#define nlm4svc_proc_test_res nlm4svc_proc_null
	491	#define nlm4svc_proc_lock_res nlm4svc_proc_null
	492	#define nlm4svc_proc_cancel_res nlm4svc_proc_null
	493	#define nlm4svc_proc_unlock_res nlm4svc_proc_null
	494
	495	struct nlm_void { int dummy; };
	496
	497	#define PROC(name, xargt, xrest, argt, rest, respsize) \
a6beb732	498	{ .pc_func = nlm4svc_proc_##name, \
026fec7e	499	.pc_decode = nlm4svc_decode_##xargt, \
63f8de37	500	.pc_encode = nlm4svc_encode_##xrest, \
1da177e4 LT	501	.pc_release = NULL, \
	502	.pc_argsize = sizeof(struct nlm_##argt), \
	503	.pc_ressize = sizeof(struct nlm_##rest), \
	504	.pc_xdrressize = respsize, \
	505	}
	506	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	507	#define No (1+1024/4) /* netobj */
	508	#define St 1 /* status */
	509	#define Rg 4 /* range (offset + length) */
860bda29	510	const struct svc_procedure nlmsvc_procedures4[] = {
1da177e4 LT	511	PROC(null, void, void, void, void, 1),
	512	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	513	PROC(lock, lockargs, res, args, res, Ck+St),
	514	PROC(cancel, cancargs, res, args, res, Ck+St),
	515	PROC(unlock, unlockargs, res, args, res, Ck+St),
	516	PROC(granted, testargs, res, args, res, Ck+St),
	517	PROC(test_msg, testargs, norep, args, void, 1),
	518	PROC(lock_msg, lockargs, norep, args, void, 1),
	519	PROC(cancel_msg, cancargs, norep, args, void, 1),
	520	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	521	PROC(granted_msg, testargs, norep, args, void, 1),
	522	PROC(test_res, testres, norep, res, void, 1),
	523	PROC(lock_res, lockres, norep, res, void, 1),
	524	PROC(cancel_res, cancelres, norep, res, void, 1),
	525	PROC(unlock_res, unlockres, norep, res, void, 1),
	526	PROC(granted_res, res, norep, res, void, 1),
	527	/* statd callback */
	528	PROC(sm_notify, reboot, void, reboot, void, 1),
	529	PROC(none, void, void, void, void, 0),
	530	PROC(none, void, void, void, void, 0),
	531	PROC(none, void, void, void, void, 0),
	532	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	533	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	534	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	535	PROC(free_all, notify, void, args, void, 1),
	536
	537	};