[linux-2.6-block.git] / fs / lockd / xdr4.c

/*
 * linux/fs/lockd/xdr4.c
 *
 * XDR support for lockd and the lock client.
 *
 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no>
 */

#include <linux/types.h>
#include <linux/sched.h>
#include <linux/nfs.h>

#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/stats.h>
#include <linux/lockd/lockd.h>

#define NLMDBG_FACILITY		NLMDBG_XDR

static inline loff_t
s64_to_loff_t(__s64 offset)
{
	return (loff_t)offset;
}


static inline s64
loff_t_to_s64(loff_t offset)
{
	s64 res;
	if (offset > NLM4_OFFSET_MAX)
		res = NLM4_OFFSET_MAX;
	else if (offset < -NLM4_OFFSET_MAX)
		res = -NLM4_OFFSET_MAX;
	else
		res = offset;
	return res;
}

/*
 * XDR functions for basic NLM types
 */
static __be32 *
nlm4_decode_cookie(__be32 *p, struct nlm_cookie *c)
{
	unsigned int	len;

	len = ntohl(*p++);
	
	if(len==0)
	{
		c->len=4;
		memset(c->data, 0, 4);	/* hockeypux brain damage */
	}
	else if(len<=NLM_MAXCOOKIELEN)
	{
		c->len=len;
		memcpy(c->data, p, len);
		p+=XDR_QUADLEN(len);
	}
	else 
	{
		dprintk("lockd: bad cookie size %d (only cookies under "
			"%d bytes are supported.)\n",
				len, NLM_MAXCOOKIELEN);
		return NULL;
	}
	return p;
}

static __be32 *
nlm4_encode_cookie(__be32 *p, struct nlm_cookie *c)
{
	*p++ = htonl(c->len);
	memcpy(p, c->data, c->len);
	p+=XDR_QUADLEN(c->len);
	return p;
}

static __be32 *
nlm4_decode_fh(__be32 *p, struct nfs_fh *f)
{
	memset(f->data, 0, sizeof(f->data));
	f->size = ntohl(*p++);
	if (f->size > NFS_MAXFHSIZE) {
		dprintk("lockd: bad fhandle size %d (should be <=%d)\n",
			f->size, NFS_MAXFHSIZE);
		return NULL;
	}
      	memcpy(f->data, p, f->size);
	return p + XDR_QUADLEN(f->size);
}

/*
 * Encode and decode owner handle
 */
static __be32 *
nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh)
{
	return xdr_decode_netobj(p, oh);
}

static __be32 *
nlm4_decode_lock(__be32 *p, struct nlm_lock *lock)
{
	struct file_lock	*fl = &lock->fl;
	__u64			len, start;
	__s64			end;

	if (!(p = xdr_decode_string_inplace(p, &lock->caller,
					    &lock->len, NLM_MAXSTRLEN))
	 || !(p = nlm4_decode_fh(p, &lock->fh))
	 || !(p = nlm4_decode_oh(p, &lock->oh)))
		return NULL;
	lock->svid  = ntohl(*p++);

	locks_init_lock(fl);
	fl->fl_owner = current->files;
	fl->fl_pid   = (pid_t)lock->svid;
	fl->fl_flags = FL_POSIX;
	fl->fl_type  = F_RDLCK;		/* as good as anything else */
	p = xdr_decode_hyper(p, &start);
	p = xdr_decode_hyper(p, &len);
	end = start + len - 1;

	fl->fl_start = s64_to_loff_t(start);

	if (len == 0 || end < 0)
		fl->fl_end = OFFSET_MAX;
	else
		fl->fl_end = s64_to_loff_t(end);
	return p;
}

/*
 * Encode result of a TEST/TEST_MSG call
 */
static __be32 *
nlm4_encode_testres(__be32 *p, struct nlm_res *resp)
{
	s64		start, len;

	dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp);
	if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
		return NULL;
	*p++ = resp->status;

	if (resp->status == nlm_lck_denied) {
		struct file_lock	*fl = &resp->lock.fl;

		*p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
		*p++ = htonl(resp->lock.svid);

		/* Encode owner handle. */
		if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
			return NULL;

		start = loff_t_to_s64(fl->fl_start);
		if (fl->fl_end == OFFSET_MAX)
			len = 0;
		else
			len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
		
		p = xdr_encode_hyper(p, start);
		p = xdr_encode_hyper(p, len);
		dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
			resp->status, (int)resp->lock.svid, fl->fl_type,
			(long long)fl->fl_start,  (long long)fl->fl_end);
	}

	dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp);
	return p;
}


/*
 * First, the server side XDR functions
 */
int
nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
	u32	exclusive;

	if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
		return 0;

	exclusive = ntohl(*p++);
	if (!(p = nlm4_decode_lock(p, &argp->lock)))
		return 0;
	if (exclusive)
		argp->lock.fl.fl_type = F_WRLCK;

	return xdr_argsize_check(rqstp, p);
}

int
nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
{
	if (!(p = nlm4_encode_testres(p, resp)))
		return 0;
	return xdr_ressize_check(rqstp, p);
}

int
nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
	u32	exclusive;

	if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
		return 0;
	argp->block  = ntohl(*p++);
	exclusive    = ntohl(*p++);
	if (!(p = nlm4_decode_lock(p, &argp->lock)))
		return 0;
	if (exclusive)
		argp->lock.fl.fl_type = F_WRLCK;
	argp->reclaim = ntohl(*p++);
	argp->state   = ntohl(*p++);
	argp->monitor = 1;		/* monitor client by default */

	return xdr_argsize_check(rqstp, p);
}

int
nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
	u32	exclusive;

	if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
		return 0;
	argp->block = ntohl(*p++);
	exclusive = ntohl(*p++);
	if (!(p = nlm4_decode_lock(p, &argp->lock)))
		return 0;
	if (exclusive)
		argp->lock.fl.fl_type = F_WRLCK;
	return xdr_argsize_check(rqstp, p);
}

int
nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
	if (!(p = nlm4_decode_cookie(p, &argp->cookie))
	 || !(p = nlm4_decode_lock(p, &argp->lock)))
		return 0;
	argp->lock.fl.fl_type = F_UNLCK;
	return xdr_argsize_check(rqstp, p);
}

int
nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
	struct nlm_lock	*lock = &argp->lock;

	memset(lock, 0, sizeof(*lock));
	locks_init_lock(&lock->fl);
	lock->svid = ~(u32) 0;
	lock->fl.fl_pid = (pid_t)lock->svid;

	if (!(p = nlm4_decode_cookie(p, &argp->cookie))
	 || !(p = xdr_decode_string_inplace(p, &lock->caller,
					    &lock->len, NLM_MAXSTRLEN))
	 || !(p = nlm4_decode_fh(p, &lock->fh))
	 || !(p = nlm4_decode_oh(p, &lock->oh)))
		return 0;
	argp->fsm_mode = ntohl(*p++);
	argp->fsm_access = ntohl(*p++);
	return xdr_argsize_check(rqstp, p);
}

int
nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
{
	if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
		return 0;
	*p++ = resp->status;
	*p++ = xdr_zero;		/* sequence argument */
	return xdr_ressize_check(rqstp, p);
}

int
nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
{
	if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
		return 0;
	*p++ = resp->status;
	return xdr_ressize_check(rqstp, p);
}

int
nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp)
{
	struct nlm_lock	*lock = &argp->lock;

	if (!(p = xdr_decode_string_inplace(p, &lock->caller,
					    &lock->len, NLM_MAXSTRLEN)))
		return 0;
	argp->state = ntohl(*p++);
	return xdr_argsize_check(rqstp, p);
}

int
nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp)
{
	if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
		return 0;
	argp->state = ntohl(*p++);
	memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
	p += XDR_QUADLEN(SM_PRIV_SIZE);
	return xdr_argsize_check(rqstp, p);
}

int
nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
{
	if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
		return 0;
	resp->status = *p++;
	return xdr_argsize_check(rqstp, p);
}

int
nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
	return xdr_argsize_check(rqstp, p);
}

int
nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
	return xdr_ressize_check(rqstp, p);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/lockd/xdr4.c
	3	*
	4	* XDR support for lockd and the lock client.
	5	*
	6	* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
	7	* Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no>
	8	*/
	9
	10	#include <linux/types.h>
	11	#include <linux/sched.h>
1da177e4 LT	12	#include <linux/nfs.h>
	13
	14	#include <linux/sunrpc/xdr.h>
	15	#include <linux/sunrpc/clnt.h>
	16	#include <linux/sunrpc/svc.h>
	17	#include <linux/sunrpc/stats.h>
	18	#include <linux/lockd/lockd.h>
1da177e4 LT	19
	20	#define NLMDBG_FACILITY NLMDBG_XDR
	21
	22	static inline loff_t
	23	s64_to_loff_t(__s64 offset)
	24	{
	25	return (loff_t)offset;
	26	}
	27
	28
	29	static inline s64
	30	loff_t_to_s64(loff_t offset)
	31	{
	32	s64 res;
	33	if (offset > NLM4_OFFSET_MAX)
	34	res = NLM4_OFFSET_MAX;
	35	else if (offset < -NLM4_OFFSET_MAX)
	36	res = -NLM4_OFFSET_MAX;
	37	else
	38	res = offset;
	39	return res;
	40	}
	41
	42	/*
	43	* XDR functions for basic NLM types
	44	*/
52921e02 AV	45	static __be32 *
52921e02 AV	46	nlm4_decode_cookie(__be32 p, struct nlm_cookie c)
1da177e4 LT	47	{
	48	unsigned int len;
	49
	50	len = ntohl(*p++);
	51
	52	if(len==0)
	53	{
	54	c->len=4;
	55	memset(c->data, 0, 4); /* hockeypux brain damage */
	56	}
	57	else if(len<=NLM_MAXCOOKIELEN)
	58	{
	59	c->len=len;
	60	memcpy(c->data, p, len);
	61	p+=XDR_QUADLEN(len);
	62	}
	63	else
	64	{
e159a08b CL	65	dprintk("lockd: bad cookie size %d (only cookies under "
	66	"%d bytes are supported.)\n",
	67	len, NLM_MAXCOOKIELEN);
1da177e4 LT	68	return NULL;
	69	}
	70	return p;
	71	}
	72
52921e02 AV	73	static __be32 *
52921e02 AV	74	nlm4_encode_cookie(__be32 p, struct nlm_cookie c)
1da177e4 LT	75	{
	76	*p++ = htonl(c->len);
	77	memcpy(p, c->data, c->len);
	78	p+=XDR_QUADLEN(c->len);
	79	return p;
	80	}
	81
52921e02 AV	82	static __be32 *
52921e02 AV	83	nlm4_decode_fh(__be32 p, struct nfs_fh f)
1da177e4 LT	84	{
	85	memset(f->data, 0, sizeof(f->data));
	86	f->size = ntohl(*p++);
	87	if (f->size > NFS_MAXFHSIZE) {
e159a08b	88	dprintk("lockd: bad fhandle size %d (should be <=%d)\n",
1da177e4 LT	89	f->size, NFS_MAXFHSIZE);
	90	return NULL;
	91	}
	92	memcpy(f->data, p, f->size);
	93	return p + XDR_QUADLEN(f->size);
	94	}
	95
1da177e4 LT	96	/*
	97	* Encode and decode owner handle
	98	*/
52921e02 AV	99	static __be32 *
52921e02 AV	100	nlm4_decode_oh(__be32 p, struct xdr_netobj oh)
1da177e4 LT	101	{
	102	return xdr_decode_netobj(p, oh);
	103	}
	104
52921e02 AV	105	static __be32 *
52921e02 AV	106	nlm4_decode_lock(__be32 p, struct nlm_lock lock)
1da177e4 LT	107	{
1da177e4 LT	108	struct file_lock *fl = &lock->fl;
d48c5f41 TM	109	__u64 len, start;
d48c5f41 TM	110	__s64 end;
1da177e4 LT	111
	112	if (!(p = xdr_decode_string_inplace(p, &lock->caller,
	113	&lock->len, NLM_MAXSTRLEN))
	114	\|\| !(p = nlm4_decode_fh(p, &lock->fh))
	115	\|\| !(p = nlm4_decode_oh(p, &lock->oh)))
	116	return NULL;
7bab377f	117	lock->svid = ntohl(*p++);
1da177e4 LT	118
	119	locks_init_lock(fl);
	120	fl->fl_owner = current->files;
7bab377f	121	fl->fl_pid = (pid_t)lock->svid;
1da177e4 LT	122	fl->fl_flags = FL_POSIX;
	123	fl->fl_type = F_RDLCK; /* as good as anything else */
	124	p = xdr_decode_hyper(p, &start);
	125	p = xdr_decode_hyper(p, &len);
	126	end = start + len - 1;
	127
	128	fl->fl_start = s64_to_loff_t(start);
	129
	130	if (len == 0 \|\| end < 0)
	131	fl->fl_end = OFFSET_MAX;
	132	else
	133	fl->fl_end = s64_to_loff_t(end);
	134	return p;
	135	}
	136
1da177e4 LT	137	/*
	138	* Encode result of a TEST/TEST_MSG call
	139	*/
52921e02 AV	140	static __be32 *
52921e02 AV	141	nlm4_encode_testres(__be32 p, struct nlm_res resp)
1da177e4 LT	142	{
	143	s64 start, len;
	144
	145	dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp);
	146	if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
	147	return NULL;
	148	*p++ = resp->status;
	149
	150	if (resp->status == nlm_lck_denied) {
	151	struct file_lock *fl = &resp->lock.fl;
	152
	153	*p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
7bab377f	154	*p++ = htonl(resp->lock.svid);
1da177e4 LT	155
	156	/* Encode owner handle. */
	157	if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
	158	return NULL;
	159
	160	start = loff_t_to_s64(fl->fl_start);
	161	if (fl->fl_end == OFFSET_MAX)
	162	len = 0;
	163	else
	164	len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
	165
	166	p = xdr_encode_hyper(p, start);
	167	p = xdr_encode_hyper(p, len);
7bab377f TM	168	dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
7bab377f TM	169	resp->status, (int)resp->lock.svid, fl->fl_type,
1da177e4 LT	170	(long long)fl->fl_start, (long long)fl->fl_end);
	171	}
	172
	173	dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp);
	174	return p;
	175	}
	176
	177
	178	/*
	179	* First, the server side XDR functions
	180	*/
	181	int
52921e02	182	nlm4svc_decode_testargs(struct svc_rqst rqstp, __be32 p, nlm_args *argp)
1da177e4 LT	183	{
	184	u32 exclusive;
	185
	186	if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
	187	return 0;
	188
	189	exclusive = ntohl(*p++);
	190	if (!(p = nlm4_decode_lock(p, &argp->lock)))
	191	return 0;
	192	if (exclusive)
	193	argp->lock.fl.fl_type = F_WRLCK;
	194
	195	return xdr_argsize_check(rqstp, p);
	196	}
	197
	198	int
52921e02	199	nlm4svc_encode_testres(struct svc_rqst rqstp, __be32 p, struct nlm_res *resp)
1da177e4 LT	200	{
	201	if (!(p = nlm4_encode_testres(p, resp)))
	202	return 0;
	203	return xdr_ressize_check(rqstp, p);
	204	}
	205
	206	int
52921e02	207	nlm4svc_decode_lockargs(struct svc_rqst rqstp, __be32 p, nlm_args *argp)
1da177e4 LT	208	{
	209	u32 exclusive;
	210
	211	if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
	212	return 0;
	213	argp->block = ntohl(*p++);
	214	exclusive = ntohl(*p++);
	215	if (!(p = nlm4_decode_lock(p, &argp->lock)))
	216	return 0;
	217	if (exclusive)
	218	argp->lock.fl.fl_type = F_WRLCK;
	219	argp->reclaim = ntohl(*p++);
	220	argp->state = ntohl(*p++);
	221	argp->monitor = 1; /* monitor client by default */
	222
	223	return xdr_argsize_check(rqstp, p);
	224	}
	225
	226	int
52921e02	227	nlm4svc_decode_cancargs(struct svc_rqst rqstp, __be32 p, nlm_args *argp)
1da177e4 LT	228	{
	229	u32 exclusive;
	230
	231	if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
	232	return 0;
	233	argp->block = ntohl(*p++);
	234	exclusive = ntohl(*p++);
	235	if (!(p = nlm4_decode_lock(p, &argp->lock)))
	236	return 0;
	237	if (exclusive)
	238	argp->lock.fl.fl_type = F_WRLCK;
	239	return xdr_argsize_check(rqstp, p);
	240	}
	241
	242	int
52921e02	243	nlm4svc_decode_unlockargs(struct svc_rqst rqstp, __be32 p, nlm_args *argp)
1da177e4 LT	244	{
	245	if (!(p = nlm4_decode_cookie(p, &argp->cookie))
	246	\|\| !(p = nlm4_decode_lock(p, &argp->lock)))
	247	return 0;
	248	argp->lock.fl.fl_type = F_UNLCK;
	249	return xdr_argsize_check(rqstp, p);
	250	}
	251
	252	int
52921e02	253	nlm4svc_decode_shareargs(struct svc_rqst rqstp, __be32 p, nlm_args *argp)
1da177e4 LT	254	{
	255	struct nlm_lock *lock = &argp->lock;
	256
	257	memset(lock, 0, sizeof(*lock));
	258	locks_init_lock(&lock->fl);
7bab377f TM	259	lock->svid = ~(u32) 0;
7bab377f TM	260	lock->fl.fl_pid = (pid_t)lock->svid;
1da177e4 LT	261
	262	if (!(p = nlm4_decode_cookie(p, &argp->cookie))
	263	\|\| !(p = xdr_decode_string_inplace(p, &lock->caller,
	264	&lock->len, NLM_MAXSTRLEN))
	265	\|\| !(p = nlm4_decode_fh(p, &lock->fh))
	266	\|\| !(p = nlm4_decode_oh(p, &lock->oh)))
	267	return 0;
	268	argp->fsm_mode = ntohl(*p++);
	269	argp->fsm_access = ntohl(*p++);
	270	return xdr_argsize_check(rqstp, p);
	271	}
	272
	273	int
52921e02	274	nlm4svc_encode_shareres(struct svc_rqst rqstp, __be32 p, struct nlm_res *resp)
1da177e4 LT	275	{
	276	if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
	277	return 0;
	278	*p++ = resp->status;
	279	p++ = xdr_zero; / sequence argument */
	280	return xdr_ressize_check(rqstp, p);
	281	}
	282
	283	int
52921e02	284	nlm4svc_encode_res(struct svc_rqst rqstp, __be32 p, struct nlm_res *resp)
1da177e4 LT	285	{
	286	if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
	287	return 0;
	288	*p++ = resp->status;
	289	return xdr_ressize_check(rqstp, p);
	290	}
	291
	292	int
52921e02	293	nlm4svc_decode_notify(struct svc_rqst rqstp, __be32 p, struct nlm_args *argp)
1da177e4 LT	294	{
	295	struct nlm_lock *lock = &argp->lock;
	296
	297	if (!(p = xdr_decode_string_inplace(p, &lock->caller,
	298	&lock->len, NLM_MAXSTRLEN)))
	299	return 0;
	300	argp->state = ntohl(*p++);
	301	return xdr_argsize_check(rqstp, p);
	302	}
	303
	304	int
52921e02	305	nlm4svc_decode_reboot(struct svc_rqst rqstp, __be32 p, struct nlm_reboot *argp)
1da177e4 LT	306	{
	307	if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
	308	return 0;
	309	argp->state = ntohl(*p++);
576df463 CL	310	memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
576df463 CL	311	p += XDR_QUADLEN(SM_PRIV_SIZE);
1da177e4 LT	312	return xdr_argsize_check(rqstp, p);
	313	}
	314
	315	int
52921e02	316	nlm4svc_decode_res(struct svc_rqst rqstp, __be32 p, struct nlm_res *resp)
1da177e4 LT	317	{
	318	if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
	319	return 0;
e8c5c045	320	resp->status = *p++;
1da177e4 LT	321	return xdr_argsize_check(rqstp, p);
	322	}
	323
	324	int
52921e02	325	nlm4svc_decode_void(struct svc_rqst rqstp, __be32 p, void *dummy)
1da177e4 LT	326	{
	327	return xdr_argsize_check(rqstp, p);
	328	}
	329
	330	int
52921e02	331	nlm4svc_encode_void(struct svc_rqst rqstp, __be32 p, void *dummy)
1da177e4 LT	332	{
	333	return xdr_ressize_check(rqstp, p);
	334	}