[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;

	/* 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 = 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;

	/* 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 = 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);
	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
	91	/* Don't accept test requests during grace period */
af558e33	92	if (locks_in_grace()) {
1da177e4	93	resp->status = nlm_lck_denied_grace_period;
b7e6b869	94	return rc;
1da177e4 LT	95	}
	96
	97	/* Obtain client and file */
	98	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	99	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	100
1da177e4 LT	101	/* Now check for conflicting locks */
8f920d5e	102	resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
5ea0d750	103	if (resp->status == nlm_drop_reply)
b7e6b869 OD	104	rc = rpc_drop_reply;
	105	else
	106	dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
1da177e4	107
1da177e4 LT	108	nlm_release_host(host);
1da177e4 LT	109	nlm_release_file(file);
b7e6b869	110	return rc;
1da177e4 LT	111	}
1da177e4 LT	112
7111c66e	113	static __be32
1da177e4 LT	114	nlm4svc_proc_lock(struct svc_rqst rqstp, struct nlm_args argp,
	115	struct nlm_res *resp)
	116	{
	117	struct nlm_host *host;
	118	struct nlm_file *file;
317602f3	119	__be32 rc = rpc_success;
1da177e4 LT	120
	121	dprintk("lockd: LOCK called\n");
	122
	123	resp->cookie = argp->cookie;
	124
	125	/* Don't accept new lock requests during grace period */
af558e33	126	if (locks_in_grace() && !argp->reclaim) {
1da177e4	127	resp->status = nlm_lck_denied_grace_period;
b7e6b869	128	return rc;
1da177e4 LT	129	}
	130
	131	/* Obtain client and file */
	132	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	133	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	134
	135	#if 0
	136	/* If supplied state doesn't match current state, we assume it's
	137	* an old request that time-warped somehow. Any error return would
	138	* do in this case because it's irrelevant anyway.
	139	*
	140	* NB: We don't retrieve the remote host's state yet.
	141	*/
	142	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
	143	resp->status = nlm_lck_denied_nolocks;
	144	} else
	145	#endif
	146
	147	/* Now try to lock the file */
6cde4de8	148	resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
1da177e4	149	argp->block, &argp->cookie);
1a8322b2	150	if (resp->status == nlm_drop_reply)
b7e6b869 OD	151	rc = rpc_drop_reply;
	152	else
	153	dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
1da177e4	154
1da177e4 LT	155	nlm_release_host(host);
1da177e4 LT	156	nlm_release_file(file);
b7e6b869	157	return rc;
1da177e4 LT	158	}
1da177e4 LT	159
7111c66e	160	static __be32
1da177e4 LT	161	nlm4svc_proc_cancel(struct svc_rqst rqstp, struct nlm_args argp,
	162	struct nlm_res *resp)
	163	{
	164	struct nlm_host *host;
	165	struct nlm_file *file;
	166
	167	dprintk("lockd: CANCEL called\n");
	168
	169	resp->cookie = argp->cookie;
	170
	171	/* Don't accept requests during grace period */
af558e33	172	if (locks_in_grace()) {
1da177e4 LT	173	resp->status = nlm_lck_denied_grace_period;
	174	return rpc_success;
	175	}
	176
	177	/* Obtain client and file */
	178	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	179	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	180
	181	/* Try to cancel request. */
	182	resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
	183
	184	dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
	185	nlm_release_host(host);
	186	nlm_release_file(file);
	187	return rpc_success;
	188	}
	189
	190	/*
	191	* UNLOCK: release a lock
	192	*/
7111c66e	193	static __be32
1da177e4 LT	194	nlm4svc_proc_unlock(struct svc_rqst rqstp, struct nlm_args argp,
	195	struct nlm_res *resp)
	196	{
	197	struct nlm_host *host;
	198	struct nlm_file *file;
	199
	200	dprintk("lockd: UNLOCK called\n");
	201
	202	resp->cookie = argp->cookie;
	203
	204	/* Don't accept new lock requests during grace period */
af558e33	205	if (locks_in_grace()) {
1da177e4 LT	206	resp->status = nlm_lck_denied_grace_period;
	207	return rpc_success;
	208	}
	209
	210	/* Obtain client and file */
	211	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	212	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	213
	214	/* Now try to remove the lock */
	215	resp->status = nlmsvc_unlock(file, &argp->lock);
	216
	217	dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
	218	nlm_release_host(host);
	219	nlm_release_file(file);
	220	return rpc_success;
	221	}
	222
	223	/*
	224	* GRANTED: A server calls us to tell that a process' lock request
	225	* was granted
	226	*/
7111c66e	227	static __be32
1da177e4 LT	228	nlm4svc_proc_granted(struct svc_rqst rqstp, struct nlm_args argp,
	229	struct nlm_res *resp)
	230	{
	231	resp->cookie = argp->cookie;
	232
	233	dprintk("lockd: GRANTED called\n");
27459f09	234	resp->status = nlmclnt_grant(svc_addr_in(rqstp), &argp->lock);
1da177e4 LT	235	dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
	236	return rpc_success;
	237	}
	238
d4716624 TM	239	/*
	240	* This is the generic lockd callback for async RPC calls
	241	*/
	242	static void nlm4svc_callback_exit(struct rpc_task task, void data)
	243	{
c041b5ff	244	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
d4716624 TM	245	-task->tk_status);
	246	}
	247
	248	static void nlm4svc_callback_release(void *data)
	249	{
a86dc496	250	lock_kernel();
d4716624	251	nlm_release_call(data);
a86dc496	252	unlock_kernel();
d4716624 TM	253	}
	254
	255	static const struct rpc_call_ops nlm4svc_callback_ops = {
	256	.rpc_call_done = nlm4svc_callback_exit,
	257	.rpc_release = nlm4svc_callback_release,
	258	};
	259
1da177e4 LT	260	/*
	261	* `Async' versions of the above service routines. They aren't really,
	262	* because we send the callback before the reply proper. I hope this
	263	* doesn't break any clients.
	264	*/
7111c66e AV	265	static __be32 nlm4svc_callback(struct svc_rqst rqstp, u32 proc, struct nlm_args argp,
7111c66e AV	266	__be32 (func)(struct svc_rqst , struct nlm_args , struct nlm_res ))
1da177e4	267	{
d4716624 TM	268	struct nlm_host *host;
d4716624 TM	269	struct nlm_rqst *call;
7111c66e	270	__be32 stat;
1da177e4	271
db4e4c9a OK	272	host = nlmsvc_lookup_host(rqstp,
	273	argp->lock.caller,
	274	argp->lock.len);
d4716624 TM	275	if (host == NULL)
	276	return rpc_system_err;
	277
	278	call = nlm_alloc_call(host);
	279	if (call == NULL)
	280	return rpc_system_err;
	281
	282	stat = func(rqstp, argp, &call->a_res);
	283	if (stat != 0) {
	284	nlm_release_call(call);
	285	return stat;
	286	}
1da177e4	287
d4716624 TM	288	call->a_flags = RPC_TASK_ASYNC;
	289	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
	290	return rpc_system_err;
	291	return rpc_success;
1da177e4 LT	292	}
1da177e4 LT	293
7111c66e	294	static __be32 nlm4svc_proc_test_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	295	void *resp)
1da177e4 LT	296	{
d4716624 TM	297	dprintk("lockd: TEST_MSG called\n");
	298	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
	299	}
1da177e4	300
7111c66e	301	static __be32 nlm4svc_proc_lock_msg(struct svc_rqst rqstp, struct nlm_args argp,
d4716624 TM	302	void *resp)
d4716624 TM	303	{
1da177e4	304	dprintk("lockd: LOCK_MSG called\n");
d4716624	305	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
1da177e4 LT	306	}
1da177e4 LT	307
7111c66e	308	static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	309	void *resp)
1da177e4 LT	310	{
1da177e4	311	dprintk("lockd: CANCEL_MSG called\n");
d4716624	312	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
1da177e4 LT	313	}
1da177e4 LT	314
7111c66e	315	static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	316	void *resp)
1da177e4 LT	317	{
1da177e4	318	dprintk("lockd: UNLOCK_MSG called\n");
d4716624	319	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
1da177e4 LT	320	}
1da177e4 LT	321
7111c66e	322	static __be32 nlm4svc_proc_granted_msg(struct svc_rqst rqstp, struct nlm_args argp,
1da177e4 LT	323	void *resp)
1da177e4 LT	324	{
1da177e4	325	dprintk("lockd: GRANTED_MSG called\n");
d4716624	326	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
1da177e4 LT	327	}
	328
	329	/*
	330	* SHARE: create a DOS share or alter existing share.
	331	*/
7111c66e	332	static __be32
1da177e4 LT	333	nlm4svc_proc_share(struct svc_rqst rqstp, struct nlm_args argp,
	334	struct nlm_res *resp)
	335	{
	336	struct nlm_host *host;
	337	struct nlm_file *file;
	338
	339	dprintk("lockd: SHARE called\n");
	340
	341	resp->cookie = argp->cookie;
	342
	343	/* Don't accept new lock requests during grace period */
af558e33	344	if (locks_in_grace() && !argp->reclaim) {
1da177e4 LT	345	resp->status = nlm_lck_denied_grace_period;
	346	return rpc_success;
	347	}
	348
	349	/* Obtain client and file */
	350	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	351	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	352
	353	/* Now try to create the share */
	354	resp->status = nlmsvc_share_file(host, file, argp);
	355
	356	dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
	357	nlm_release_host(host);
	358	nlm_release_file(file);
	359	return rpc_success;
	360	}
	361
	362	/*
	363	* UNSHARE: Release a DOS share.
	364	*/
7111c66e	365	static __be32
1da177e4 LT	366	nlm4svc_proc_unshare(struct svc_rqst rqstp, struct nlm_args argp,
	367	struct nlm_res *resp)
	368	{
	369	struct nlm_host *host;
	370	struct nlm_file *file;
	371
	372	dprintk("lockd: UNSHARE called\n");
	373
	374	resp->cookie = argp->cookie;
	375
	376	/* Don't accept requests during grace period */
af558e33	377	if (locks_in_grace()) {
1da177e4 LT	378	resp->status = nlm_lck_denied_grace_period;
	379	return rpc_success;
	380	}
	381
	382	/* Obtain client and file */
	383	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
d343fce1	384	return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
1da177e4 LT	385
	386	/* Now try to lock the file */
	387	resp->status = nlmsvc_unshare_file(host, file, argp);
	388
	389	dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
	390	nlm_release_host(host);
	391	nlm_release_file(file);
	392	return rpc_success;
	393	}
	394
	395	/*
	396	* NM_LOCK: Create an unmonitored lock
	397	*/
7111c66e	398	static __be32
1da177e4 LT	399	nlm4svc_proc_nm_lock(struct svc_rqst rqstp, struct nlm_args argp,
	400	struct nlm_res *resp)
	401	{
	402	dprintk("lockd: NM_LOCK called\n");
	403
	404	argp->monitor = 0; /* just clean the monitor flag */
	405	return nlm4svc_proc_lock(rqstp, argp, resp);
	406	}
	407
	408	/*
	409	* FREE_ALL: Release all locks and shares held by client
	410	*/
7111c66e	411	static __be32
1da177e4 LT	412	nlm4svc_proc_free_all(struct svc_rqst rqstp, struct nlm_args argp,
	413	void *resp)
	414	{
	415	struct nlm_host *host;
	416
	417	/* Obtain client */
	418	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
	419	return rpc_success;
	420
	421	nlmsvc_free_host_resources(host);
	422	nlm_release_host(host);
	423	return rpc_success;
	424	}
	425
	426	/*
	427	* SM_NOTIFY: private callback from statd (not part of official NLM proto)
	428	*/
7111c66e	429	static __be32
1da177e4 LT	430	nlm4svc_proc_sm_notify(struct svc_rqst rqstp, struct nlm_reboot argp,
	431	void *resp)
	432	{
27459f09 CL	433	struct sockaddr_in saddr;
	434
	435	memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr));
1da177e4 LT	436
	437	dprintk("lockd: SM_NOTIFY called\n");
	438	if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
	439	\|\| ntohs(saddr.sin_port) >= 1024) {
ad06e4bd CL	440	char buf[RPC_MAX_ADDRBUFLEN];
	441	printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
	442	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4 LT	443	return rpc_system_err;
	444	}
	445
	446	/* Obtain the host pointer for this NFS server and try to
	447	* reclaim all locks we hold on this server.
	448	*/
cf712c24	449	memset(&saddr, 0, sizeof(saddr));
1da177e4	450	saddr.sin_addr.s_addr = argp->addr;
5c8dd29c	451	nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state);
1da177e4	452
1da177e4 LT	453	return rpc_success;
	454	}
	455
	456	/*
	457	* client sent a GRANTED_RES, let's remove the associated block
	458	*/
7111c66e	459	static __be32
1da177e4 LT	460	nlm4svc_proc_granted_res(struct svc_rqst rqstp, struct nlm_res argp,
	461	void *resp)
	462	{
	463	if (!nlmsvc_ops)
	464	return rpc_success;
	465
	466	dprintk("lockd: GRANTED_RES called\n");
	467
39be4502	468	nlmsvc_grant_reply(&argp->cookie, argp->status);
1da177e4 LT	469	return rpc_success;
	470	}
	471
	472
1da177e4 LT	473	/*
	474	* NLM Server procedures.
	475	*/
	476
	477	#define nlm4svc_encode_norep nlm4svc_encode_void
	478	#define nlm4svc_decode_norep nlm4svc_decode_void
	479	#define nlm4svc_decode_testres nlm4svc_decode_void
	480	#define nlm4svc_decode_lockres nlm4svc_decode_void
	481	#define nlm4svc_decode_unlockres nlm4svc_decode_void
	482	#define nlm4svc_decode_cancelres nlm4svc_decode_void
	483	#define nlm4svc_decode_grantedres nlm4svc_decode_void
	484
	485	#define nlm4svc_proc_none nlm4svc_proc_null
	486	#define nlm4svc_proc_test_res nlm4svc_proc_null
	487	#define nlm4svc_proc_lock_res nlm4svc_proc_null
	488	#define nlm4svc_proc_cancel_res nlm4svc_proc_null
	489	#define nlm4svc_proc_unlock_res nlm4svc_proc_null
	490
	491	struct nlm_void { int dummy; };
	492
	493	#define PROC(name, xargt, xrest, argt, rest, respsize) \
	494	{ .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
	495	.pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
	496	.pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
	497	.pc_release = NULL, \
	498	.pc_argsize = sizeof(struct nlm_##argt), \
	499	.pc_ressize = sizeof(struct nlm_##rest), \
	500	.pc_xdrressize = respsize, \
	501	}
	502	#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
	503	#define No (1+1024/4) /* netobj */
	504	#define St 1 /* status */
	505	#define Rg 4 /* range (offset + length) */
	506	struct svc_procedure nlmsvc_procedures4[] = {
	507	PROC(null, void, void, void, void, 1),
	508	PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
	509	PROC(lock, lockargs, res, args, res, Ck+St),
	510	PROC(cancel, cancargs, res, args, res, Ck+St),
	511	PROC(unlock, unlockargs, res, args, res, Ck+St),
	512	PROC(granted, testargs, res, args, res, Ck+St),
	513	PROC(test_msg, testargs, norep, args, void, 1),
	514	PROC(lock_msg, lockargs, norep, args, void, 1),
	515	PROC(cancel_msg, cancargs, norep, args, void, 1),
	516	PROC(unlock_msg, unlockargs, norep, args, void, 1),
	517	PROC(granted_msg, testargs, norep, args, void, 1),
	518	PROC(test_res, testres, norep, res, void, 1),
	519	PROC(lock_res, lockres, norep, res, void, 1),
	520	PROC(cancel_res, cancelres, norep, res, void, 1),
	521	PROC(unlock_res, unlockres, norep, res, void, 1),
	522	PROC(granted_res, res, norep, res, void, 1),
	523	/* statd callback */
	524	PROC(sm_notify, reboot, void, reboot, void, 1),
	525	PROC(none, void, void, void, void, 0),
	526	PROC(none, void, void, void, void, 0),
	527	PROC(none, void, void, void, void, 0),
	528	PROC(share, shareargs, shareres, args, res, Ck+St+1),
	529	PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
	530	PROC(nm_lock, lockargs, res, args, res, Ck+St),
	531	PROC(free_all, notify, void, args, void, 1),
	532
	533	};