/* * 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>#define NLMDBG_FACILITY		NLMDBG_CLIENT#ifdef CONFIG_LOCKD_V4static __be32cast_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 __be32nlmsvc_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 __be32nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp){	dprintk("lockd: NULL          called\n");	return rpc_success;}/* * TEST: Check for conflicting lock */static __be32nlmsvc_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;	/* 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 __be32nlmsvc_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 = 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,					       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 __be32nlmsvc_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 __be32nlmsvc_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 __be32nlmsvc_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(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 __be32nlmsvc_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 __be32nlmsvc_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 __be32nlmsvc_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 __be32nlmsvc_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 __be32nlmsvc_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 __be32nlmsvc_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 __be32nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,					      void	        *resp){	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(argp);	return rpc_success;}/* * client sent a GRANTED_RES, let's remove the associated block */static __be32nlmsvc_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_nullstruct 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),};