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

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

#include <linux/types.h>
#include <linux/time.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfsd/nfsd.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/share.h>
#include <linux/lockd/sm_inter.h>


#define NLMDBG_FACILITY		NLMDBG_CLIENT

#ifdef CONFIG_LOCKD_V4
static __be32
cast_to_nlm(__be32 status, u32 vers)
{
	/* Note: status is assumed to be in network byte order !!! */
	if (vers != 4){
		switch (status) {
		case nlm_granted:
		case nlm_lck_denied:
		case nlm_lck_denied_nolocks:
		case nlm_lck_blocked:
		case nlm_lck_denied_grace_period:
		case nlm_drop_reply:
			break;
		case nlm4_deadlock:
			status = nlm_lck_denied;
			break;
		default:
			status = nlm_lck_denied_nolocks;
		}
	}

	return (status);
}
#define	cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
#else
#define cast_status(status) (status)
#endif

/*
 * Obtain client and file from arguments
 */
static __be32
nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
			struct nlm_host **hostp, struct nlm_file **filp)
{
	struct nlm_host		*host = NULL;
	struct nlm_file		*file = NULL;
	struct nlm_lock		*lock = &argp->lock;
	__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
nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
	dprintk("lockd: NULL          called\n");
	return rpc_success;
}

/*
 * TEST: Check for conflicting lock
 */
static __be32
nlmsvc_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: TEST          called\n");
	resp->cookie = argp->cookie;

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

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

	/* Now check for conflicting locks */
	resp->status = cast_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: TEST          status %d vers %d\n",
			ntohl(resp->status), rqstp->rq_vers);

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

static __be32
nlmsvc_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;

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

	/* Obtain client and file */
	if ((resp->status = nlmsvc_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 = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock,
					       argp->block, &argp->cookie));
	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
nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
				           struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

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

	resp->cookie = argp->cookie;

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

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

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

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

/*
 * UNLOCK: release a lock
 */
static __be32
nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
				           struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

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

	resp->cookie = argp->cookie;

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

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

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

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

/*
 * GRANTED: A server calls us to tell that a process' lock request
 * was granted
 */
static __be32
nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
				            struct nlm_res  *resp)
{
	resp->cookie = argp->cookie;

	dprintk("lockd: GRANTED       called\n");
	resp->status = nlmclnt_grant(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 nlmsvc_callback_exit(struct rpc_task *task, void *data)
{
	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
			-task->tk_status);
}

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

static const struct rpc_call_ops nlmsvc_callback_ops = {
	.rpc_call_done = nlmsvc_callback_exit,
	.rpc_release = nlmsvc_callback_release,
};

/*
 * `Async' versions of the above service routines. They aren't really,
 * because we send the callback before the reply proper. I hope this
 * doesn't break any clients.
 */
static __be32 nlmsvc_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, &nlmsvc_callback_ops) < 0)
		return rpc_system_err;
	return rpc_success;
}

static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
					     void	     *resp)
{
	dprintk("lockd: TEST_MSG      called\n");
	return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test);
}

static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
					     void	     *resp)
{
	dprintk("lockd: LOCK_MSG      called\n");
	return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock);
}

static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
					       void	       *resp)
{
	dprintk("lockd: CANCEL_MSG    called\n");
	return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel);
}

static __be32
nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
                                               void            *resp)
{
	dprintk("lockd: UNLOCK_MSG    called\n");
	return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock);
}

static __be32
nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
                                                void            *resp)
{
	dprintk("lockd: GRANTED_MSG   called\n");
	return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted);
}

/*
 * SHARE: create a DOS share or alter existing share.
 */
static __be32
nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
				          struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

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

	resp->cookie = argp->cookie;

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

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

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

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

/*
 * UNSHARE: Release a DOS share.
 */
static __be32
nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
				            struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

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

	resp->cookie = argp->cookie;

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

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

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

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

/*
 * NM_LOCK: Create an unmonitored lock
 */
static __be32
nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
				            struct nlm_res  *resp)
{
	dprintk("lockd: NM_LOCK       called\n");

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

/*
 * FREE_ALL: Release all locks and shares held by client
 */
static __be32
nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
					     void            *resp)
{
	struct nlm_host	*host;

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

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

/*
 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
 */
static __be32
nlmsvc_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
nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res  *argp,
                                                void            *resp)
{
	if (!nlmsvc_ops)
		return rpc_success;

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

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

/*
 * NLM Server procedures.
 */

#define nlmsvc_encode_norep	nlmsvc_encode_void
#define nlmsvc_decode_norep	nlmsvc_decode_void
#define nlmsvc_decode_testres	nlmsvc_decode_void
#define nlmsvc_decode_lockres	nlmsvc_decode_void
#define nlmsvc_decode_unlockres	nlmsvc_decode_void
#define nlmsvc_decode_cancelres	nlmsvc_decode_void
#define nlmsvc_decode_grantedres	nlmsvc_decode_void

#define nlmsvc_proc_none	nlmsvc_proc_null
#define nlmsvc_proc_test_res	nlmsvc_proc_null
#define nlmsvc_proc_lock_res	nlmsvc_proc_null
#define nlmsvc_proc_cancel_res	nlmsvc_proc_null
#define nlmsvc_proc_unlock_res	nlmsvc_proc_null

struct nlm_void			{ int dummy; };

#define PROC(name, xargt, xrest, argt, rest, respsize)	\
 { .pc_func	= (svc_procfunc) nlmsvc_proc_##name,	\
   .pc_decode	= (kxdrproc_t) nlmsvc_decode_##xargt,	\
   .pc_encode	= (kxdrproc_t) nlmsvc_encode_##xrest,	\
   .pc_release	= NULL,					\
   .pc_argsize	= sizeof(struct nlm_##argt),		\
   .pc_ressize	= sizeof(struct nlm_##rest),		\
   .pc_xdrressize = respsize,				\
 }

#define	Ck	(1+XDR_QUADLEN(NLM_MAXCOOKIELEN))	/* cookie */
#define	St	1				/* status */
#define	No	(1+1024/4)			/* Net Obj */
#define	Rg	2				/* range - offset + size */

struct svc_procedure		nlmsvc_procedures[] = {
  PROC(null,		void,		void,		void,	void, 1),
  PROC(test,		testargs,	testres,	args,	res, Ck+St+2+No+Rg),
  PROC(lock,		lockargs,	res,		args,	res, Ck+St),
  PROC(cancel,		cancargs,	res,		args,	res, Ck+St),
  PROC(unlock,		unlockargs,	res,		args,	res, Ck+St),
  PROC(granted,		testargs,	res,		args,	res, Ck+St),
  PROC(test_msg,	testargs,	norep,		args,	void, 1),
  PROC(lock_msg,	lockargs,	norep,		args,	void, 1),
  PROC(cancel_msg,	cancargs,	norep,		args,	void, 1),
  PROC(unlock_msg,	unlockargs,	norep,		args,	void, 1),
  PROC(granted_msg,	testargs,	norep,		args,	void, 1),
  PROC(test_res,	testres,	norep,		res,	void, 1),
  PROC(lock_res,	lockres,	norep,		res,	void, 1),
  PROC(cancel_res,	cancelres,	norep,		res,	void, 1),
  PROC(unlock_res,	unlockres,	norep,		res,	void, 1),
  PROC(granted_res,	res,		norep,		res,	void, 1),
  /* statd callback */
  PROC(sm_notify,	reboot,		void,		reboot,	void, 1),
  PROC(none,		void,		void,		void,	void, 1),
  PROC(none,		void,		void,		void,	void, 1),
  PROC(none,		void,		void,		void,	void, 1),
  PROC(share,		shareargs,	shareres,	args,	res, Ck+St+1),
  PROC(unshare,		shareargs,	shareres,	args,	res, Ck+St+1),
  PROC(nm_lock,		lockargs,	res,		args,	res, Ck+St),
  PROC(free_all,	notify,		void,		args,	void, 0),

};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/lockd/svcproc.c
	3	*
	4	* Lockd server procedures. We don't implement the NLM_*_RES
	5	* procedures because we don't use the async procedures.
	6	*
	7	* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
	8	*/
	9
1da177e4 LT	10	#include <linux/types.h>
	11	#include <linux/time.h>
	12	#include <linux/slab.h>
	13	#include <linux/in.h>
	14	#include <linux/sunrpc/svc.h>
	15	#include <linux/sunrpc/clnt.h>
	16	#include <linux/nfsd/nfsd.h>
	17	#include <linux/lockd/lockd.h>
	18	#include <linux/lockd/share.h>
	19	#include <linux/lockd/sm_inter.h>
	20
	21
	22	#define NLMDBG_FACILITY NLMDBG_CLIENT
	23
1da177e4	24	#ifdef CONFIG_LOCKD_V4
52921e02 AV	25	static __be32
52921e02 AV	26	cast_to_nlm(__be32 status, u32 vers)
1da177e4 LT	27	{
	28	/* Note: status is assumed to be in network byte order !!! */
	29	if (vers != 4){
	30	switch (status) {
	31	case nlm_granted:
	32	case nlm_lck_denied:
	33	case nlm_lck_denied_nolocks:
	34	case nlm_lck_blocked:
	35	case nlm_lck_denied_grace_period:
5ea0d750	36	case nlm_drop_reply:
1da177e4 LT	37	break;
	38	case nlm4_deadlock:
	39	status = nlm_lck_denied;
	40	break;
	41	default:
	42	status = nlm_lck_denied_nolocks;
	43	}
	44	}
	45
	46	return (status);
	47	}
	48	#define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers))
	49	#else
	50	#define cast_status(status) (status)
	51	#endif
	52
	53	/*
	54	* Obtain client and file from arguments
	55	*/
52921e02	56	static __be32
1da177e4 LT	57	nlmsvc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,
	58	struct nlm_host hostp, struct nlm_file filp)
	59	{
	60	struct nlm_host *host = NULL;
	61	struct nlm_file *file = NULL;
	62	struct nlm_lock *lock = &argp->lock;
52921e02	63	__be32 error = 0;
1da177e4 LT	64
	65	/* nfsd callbacks must have been installed for this procedure */
	66	if (!nlmsvc_ops)
	67	return nlm_lck_denied_nolocks;
	68
	69	/* Obtain host handle */
db4e4c9a	70	if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
977faf39	71	\|\| (argp->monitor && nsm_monitor(host) < 0))
1da177e4 LT	72	goto no_locks;
	73	*hostp = host;
	74
	75	/* Obtain file pointer. Not used by FREE_ALL call. */
	76	if (filp != NULL) {
	77	if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
	78	goto no_locks;
	79	*filp = file;
	80
	81	/* Set up the missing parts of the file_lock structure */
	82	lock->fl.fl_file = file->f_file;
	83	lock->fl.fl_owner = (fl_owner_t) host;
	84	lock->fl.fl_lmops = &nlmsvc_lock_operations;
	85	}
	86
	87	return 0;
	88
	89	no_locks:
b0e92aae	90	nlm_release_host(host);
d343fce1 N	91	if (error)
d343fce1 N	92	return error;
1da177e4 LT	93	return nlm_lck_denied_nolocks;
	94	}
	95
	96	/*
	97	* NULL: Test for presence of service
	98	*/
7111c66e	99	static __be32
1da177e4 LT	100	nlmsvc_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	101	{
	102	dprintk("lockd: NULL called\n");
	103	return rpc_success;
	104	}
	105
	106	/*
	107	* TEST: Check for conflicting lock
	108	*/
7111c66e	109	static __be32
1da177e4 LT	110	nlmsvc_proc_test(struct svc_rqst rqstp, struct nlm_args argp,
	111	struct nlm_res *resp)
	112	{
	113	struct nlm_host *host;
	114	struct nlm_file *file;
317602f3	115	__be32 rc = rpc_success;
1da177e4 LT	116
	117	dprintk("lockd: TEST called\n");
	118	resp->cookie = argp->cookie;
	119
	120	/* Don't accept test requests during grace period */
af558e33	121	if (locks_in_grace()) {
1da177e4	122	resp->status = nlm_lck_denied_grace_period;
b7e6b869	123	return rc;
1da177e4 LT	124	}
	125
	126	/* Obtain client and file */
	127	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	128	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	129
1da177e4 LT	130	/* Now check for conflicting locks */
8f920d5e	131	resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie));
5ea0d750	132	if (resp->status == nlm_drop_reply)
b7e6b869 OD	133	rc = rpc_drop_reply;
	134	else
	135	dprintk("lockd: TEST status %d vers %d\n",
	136	ntohl(resp->status), rqstp->rq_vers);
1da177e4	137
1da177e4 LT	138	nlm_release_host(host);
1da177e4 LT	139	nlm_release_file(file);
b7e6b869	140	return rc;
1da177e4 LT	141	}
1da177e4 LT	142
7111c66e	143	static __be32
1da177e4 LT	144	nlmsvc_proc_lock(struct svc_rqst rqstp, struct nlm_args argp,
	145	struct nlm_res *resp)
	146	{
	147	struct nlm_host *host;
	148	struct nlm_file *file;
317602f3	149	__be32 rc = rpc_success;
1da177e4 LT	150
	151	dprintk("lockd: LOCK called\n");
	152
	153	resp->cookie = argp->cookie;
	154
	155	/* Don't accept new lock requests during grace period */
af558e33	156	if (locks_in_grace() && !argp->reclaim) {
1da177e4	157	resp->status = nlm_lck_denied_grace_period;
b7e6b869	158	return rc;
1da177e4 LT	159	}
	160
	161	/* Obtain client and file */
	162	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	163	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	164
	165	#if 0
	166	/* If supplied state doesn't match current state, we assume it's
	167	* an old request that time-warped somehow. Any error return would
	168	* do in this case because it's irrelevant anyway.
	169	*
	170	* NB: We don't retrieve the remote host's state yet.
	171	*/
	172	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	173	resp->status = nlm_lck_denied_nolocks;
	174	} else
	175	#endif
	176
	177	/* Now try to lock the file */
6cde4de8	178	resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock,
1da177e4	179	argp->block, &argp->cookie));
1a8322b2	180	if (resp->status == nlm_drop_reply)
b7e6b869 OD	181	rc = rpc_drop_reply;
	182	else
	183	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
1da177e4	184
1da177e4 LT	185	nlm_release_host(host);
1da177e4 LT	186	nlm_release_file(file);
b7e6b869	187	return rc;
1da177e4 LT	188	}
1da177e4 LT	189
7111c66e	190	static __be32
1da177e4 LT	191	nlmsvc_proc_cancel(struct svc_rqst rqstp, struct nlm_args argp,
	192	struct nlm_res *resp)
	193	{
	194	struct nlm_host *host;
	195	struct nlm_file *file;
	196
	197	dprintk("lockd: CANCEL called\n");
	198
	199	resp->cookie = argp->cookie;
	200
	201	/* Don't accept requests during grace period */
af558e33	202	if (locks_in_grace()) {
1da177e4 LT	203	resp->status = nlm_lck_denied_grace_period;
	204	return rpc_success;
	205	}
	206
	207	/* Obtain client and file */
	208	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	209	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	210
	211	/* Try to cancel request. */
	212	resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock));
	213
	214	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
	215	nlm_release_host(host);
	216	nlm_release_file(file);
	217	return rpc_success;
	218	}
	219
	220	/*
	221	* UNLOCK: release a lock
	222	*/
7111c66e	223	static __be32
1da177e4 LT	224	nlmsvc_proc_unlock(struct svc_rqst rqstp, struct nlm_args argp,
	225	struct nlm_res *resp)
	226	{
	227	struct nlm_host *host;
	228	struct nlm_file *file;
	229
	230	dprintk("lockd: UNLOCK called\n");
	231
	232	resp->cookie = argp->cookie;
	233
	234	/* Don't accept new lock requests during grace period */
af558e33	235	if (locks_in_grace()) {
1da177e4 LT	236	resp->status = nlm_lck_denied_grace_period;
	237	return rpc_success;
	238	}
	239
	240	/* Obtain client and file */
	241	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	242	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	243
	244	/* Now try to remove the lock */
	245	resp->status = cast_status(nlmsvc_unlock(file, &argp->lock));
	246
	247	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
	248	nlm_release_host(host);
	249	nlm_release_file(file);
	250	return rpc_success;
	251	}
	252
	253	/*
	254	* GRANTED: A server calls us to tell that a process' lock request
	255	* was granted
	256	*/
7111c66e	257	static __be32
1da177e4 LT	258	nlmsvc_proc_granted(struct svc_rqst rqstp, struct nlm_args argp,
	259	struct nlm_res *resp)
	260	{
	261	resp->cookie = argp->cookie;
	262
	263	dprintk("lockd: GRANTED called\n");
27459f09	264	resp->status = nlmclnt_grant(svc_addr_in(rqstp), &argp->lock);
1da177e4 LT	265	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	266	return rpc_success;
	267	}
	268
d4716624 TM	269	/*
	270	* This is the generic lockd callback for async RPC calls
	271	*/
	272	static void nlmsvc_callback_exit(struct rpc_task task, void data)
	273	{
c041b5ff	274	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	275	-task->tk_status);
	276	}
	277
	278	static void nlmsvc_callback_release(void *data)
	279	{
a86dc496	280	lock_kernel();
d4716624	281	nlm_release_call(data);
a86dc496	282	unlock_kernel();
d4716624 TM	283	}
	284
	285	static const struct rpc_call_ops nlmsvc_callback_ops = {
	286	.rpc_call_done = nlmsvc_callback_exit,
	287	.rpc_release = nlmsvc_callback_release,
	288	};
	289
1da177e4 LT	290	/*
	291	* `Async' versions of the above service routines. They aren't really,
	292	* because we send the callback before the reply proper. I hope this
	293	* doesn't break any clients.
	294	*/
7111c66e AV	295	static __be32 nlmsvc_callback(struct svc_rqst rqstp, u32 proc, struct nlm_args argp,
7111c66e AV	296	__be32 (func)(struct svc_rqst , struct nlm_args , struct nlm_res ))
1da177e4	297	{
d4716624 TM	298	struct nlm_host *host;
d4716624 TM	299	struct nlm_rqst *call;
7111c66e	300	__be32 stat;
1da177e4	301
db4e4c9a OK	302	host = nlmsvc_lookup_host(rqstp,
	303	argp->lock.caller,
	304	argp->lock.len);
d4716624 TM	305	if (host == NULL)
	306	return rpc_system_err;
	307
	308	call = nlm_alloc_call(host);
	309	if (call == NULL)
	310	return rpc_system_err;
	311
	312	stat = func(rqstp, argp, &call->a_res);
	313	if (stat != 0) {
	314	nlm_release_call(call);
	315	return stat;
	316	}
1da177e4	317
d4716624 TM	318	call->a_flags = RPC_TASK_ASYNC;
	319	if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
	320	return rpc_system_err;
	321	return rpc_success;
1da177e4 LT	322	}
1da177e4 LT	323
7111c66e	324	static __be32 nlmsvc_proc_test_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	325	void *resp)
1da177e4 LT	326	{
d4716624 TM	327	dprintk("lockd: TEST_MSG called\n");
	328	return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test);
	329	}
1da177e4	330
7111c66e	331	static __be32 nlmsvc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
d4716624 TM	332	void *resp)
d4716624 TM	333	{
1da177e4	334	dprintk("lockd: LOCK_MSG called\n");
d4716624	335	return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock);
1da177e4 LT	336	}
1da177e4 LT	337
7111c66e	338	static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	339	void *resp)
1da177e4 LT	340	{
1da177e4	341	dprintk("lockd: CANCEL_MSG called\n");
d4716624	342	return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel);
1da177e4 LT	343	}
1da177e4 LT	344
7111c66e	345	static __be32
1da177e4 LT	346	nlmsvc_proc_unlock_msg(struct svc_rqst rqstp, struct nlm_args argp,
	347	void *resp)
	348	{
1da177e4	349	dprintk("lockd: UNLOCK_MSG called\n");
d4716624	350	return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock);
1da177e4 LT	351	}
1da177e4 LT	352
7111c66e	353	static __be32
1da177e4 LT	354	nlmsvc_proc_granted_msg(struct svc_rqst rqstp, struct nlm_args argp,
	355	void *resp)
	356	{
1da177e4	357	dprintk("lockd: GRANTED_MSG called\n");
d4716624	358	return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted);
1da177e4 LT	359	}
	360
	361	/*
	362	* SHARE: create a DOS share or alter existing share.
	363	*/
7111c66e	364	static __be32
1da177e4 LT	365	nlmsvc_proc_share(struct svc_rqst rqstp, struct nlm_args argp,
	366	struct nlm_res *resp)
	367	{
	368	struct nlm_host *host;
	369	struct nlm_file *file;
	370
	371	dprintk("lockd: SHARE called\n");
	372
	373	resp->cookie = argp->cookie;
	374
	375	/* Don't accept new lock requests during grace period */
af558e33	376	if (locks_in_grace() && !argp->reclaim) {
1da177e4 LT	377	resp->status = nlm_lck_denied_grace_period;
	378	return rpc_success;
	379	}
	380
	381	/* Obtain client and file */
	382	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	383	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	384
	385	/* Now try to create the share */
	386	resp->status = cast_status(nlmsvc_share_file(host, file, argp));
	387
	388	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
	389	nlm_release_host(host);
	390	nlm_release_file(file);
	391	return rpc_success;
	392	}
	393
	394	/*
	395	* UNSHARE: Release a DOS share.
	396	*/
7111c66e	397	static __be32
1da177e4 LT	398	nlmsvc_proc_unshare(struct svc_rqst rqstp, struct nlm_args argp,
	399	struct nlm_res *resp)
	400	{
	401	struct nlm_host *host;
	402	struct nlm_file *file;
	403
	404	dprintk("lockd: UNSHARE called\n");
	405
	406	resp->cookie = argp->cookie;
	407
	408	/* Don't accept requests during grace period */
af558e33	409	if (locks_in_grace()) {
1da177e4 LT	410	resp->status = nlm_lck_denied_grace_period;
	411	return rpc_success;
	412	}
	413
	414	/* Obtain client and file */
	415	if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	416	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	417
	418	/* Now try to unshare the file */
	419	resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
	420
	421	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
	422	nlm_release_host(host);
	423	nlm_release_file(file);
	424	return rpc_success;
	425	}
	426
	427	/*
	428	* NM_LOCK: Create an unmonitored lock
	429	*/
7111c66e	430	static __be32
1da177e4 LT	431	nlmsvc_proc_nm_lock(struct svc_rqst rqstp, struct nlm_args argp,
	432	struct nlm_res *resp)
	433	{
	434	dprintk("lockd: NM_LOCK called\n");
	435
	436	argp->monitor = 0; /* just clean the monitor flag */
	437	return nlmsvc_proc_lock(rqstp, argp, resp);
	438	}
	439
	440	/*
	441	* FREE_ALL: Release all locks and shares held by client
	442	*/
7111c66e	443	static __be32
1da177e4 LT	444	nlmsvc_proc_free_all(struct svc_rqst rqstp, struct nlm_args argp,
	445	void *resp)
	446	{
	447	struct nlm_host *host;
	448
	449	/* Obtain client */
	450	if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL))
	451	return rpc_success;
	452
	453	nlmsvc_free_host_resources(host);
	454	nlm_release_host(host);
	455	return rpc_success;
	456	}
	457
	458	/*
	459	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	460	*/
7111c66e	461	static __be32
1da177e4 LT	462	nlmsvc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
	463	void *resp)
	464	{
27459f09 CL	465	struct sockaddr_in saddr;
	466
	467	memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr));
1da177e4 LT	468
	469	dprintk("lockd: SM_NOTIFY called\n");
	470	if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
	471	\|\| ntohs(saddr.sin_port) >= 1024) {
ad06e4bd CL	472	char buf[RPC_MAX_ADDRBUFLEN];
	473	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	474	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	475	return rpc_system_err;
	476	}
	477
	478	/* Obtain the host pointer for this NFS server and try to
	479	* reclaim all locks we hold on this server.
	480	*/
cf712c24	481	memset(&saddr, 0, sizeof(saddr));
1da177e4	482	saddr.sin_addr.s_addr = argp->addr;
5c8dd29c	483	nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state);
1da177e4 LT	484
	485	return rpc_success;
	486	}
	487
	488	/*
	489	* client sent a GRANTED_RES, let's remove the associated block
	490	*/
7111c66e	491	static __be32
1da177e4 LT	492	nlmsvc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
	493	void *resp)
	494	{
	495	if (!nlmsvc_ops)
	496	return rpc_success;
	497
	498	dprintk("lockd: GRANTED_RES called\n");
	499
39be4502	500	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	501	return rpc_success;
	502	}
	503
1da177e4 LT	504	/*
	505	* NLM Server procedures.
	506	*/
	507
	508	#define nlmsvc_encode_norep nlmsvc_encode_void
	509	#define nlmsvc_decode_norep nlmsvc_decode_void
	510	#define nlmsvc_decode_testres nlmsvc_decode_void
	511	#define nlmsvc_decode_lockres nlmsvc_decode_void
	512	#define nlmsvc_decode_unlockres nlmsvc_decode_void
	513	#define nlmsvc_decode_cancelres nlmsvc_decode_void
	514	#define nlmsvc_decode_grantedres nlmsvc_decode_void
	515
	516	#define nlmsvc_proc_none nlmsvc_proc_null
	517	#define nlmsvc_proc_test_res nlmsvc_proc_null
	518	#define nlmsvc_proc_lock_res nlmsvc_proc_null
	519	#define nlmsvc_proc_cancel_res nlmsvc_proc_null
	520	#define nlmsvc_proc_unlock_res nlmsvc_proc_null
	521
	522	struct nlm_void { int dummy; };
	523
	524	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	525	{ .pc_func = (svc_procfunc) nlmsvc_proc_##name, \
	526	.pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \
	527	.pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \
	528	.pc_release = NULL, \
	529	.pc_argsize = sizeof(struct nlm_##argt), \
	530	.pc_ressize = sizeof(struct nlm_##rest), \
	531	.pc_xdrressize = respsize, \
	532	}
	533
	534	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	535	#define St 1 /* status */
	536	#define No (1+1024/4) /* Net Obj */
	537	#define Rg 2 /* range - offset + size */
	538
	539	struct svc_procedure nlmsvc_procedures[] = {
	540	PROC(null, void, void, void, void, 1),
	541	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	542	PROC(lock, lockargs, res, args, res, Ck+St),
	543	PROC(cancel, cancargs, res, args, res, Ck+St),
	544	PROC(unlock, unlockargs, res, args, res, Ck+St),
	545	PROC(granted, testargs, res, args, res, Ck+St),
	546	PROC(test_msg, testargs, norep, args, void, 1),
	547	PROC(lock_msg, lockargs, norep, args, void, 1),
	548	PROC(cancel_msg, cancargs, norep, args, void, 1),
	549	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	550	PROC(granted_msg, testargs, norep, args, void, 1),
	551	PROC(test_res, testres, norep, res, void, 1),
	552	PROC(lock_res, lockres, norep, res, void, 1),
	553	PROC(cancel_res, cancelres, norep, res, void, 1),
	554	PROC(unlock_res, unlockres, norep, res, void, 1),
	555	PROC(granted_res, res, norep, res, void, 1),
	556	/* statd callback */
	557	PROC(sm_notify, reboot, void, reboot, void, 1),
	558	PROC(none, void, void, void, void, 1),
	559	PROC(none, void, void, void, void, 1),
	560	PROC(none, void, void, void, void, 1),
	561	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	562	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	563	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	564	PROC(free_all, notify, void, args, void, 0),
	565
	566	};