[linux.git] / fs / nfs / mount_clnt.c

/*
 * linux/fs/nfs/mount_clnt.c
 *
 * MOUNT client to support NFSroot.
 *
 * Copyright (C) 1997, Olaf Kirch <[email protected]>
 */

#include <linux/types.h>
#include <linux/socket.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/uio.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/sched.h>
#include <linux/nfs_fs.h>

#ifdef RPC_DEBUG
# define NFSDBG_FACILITY	NFSDBG_ROOT
#endif

/*
#define MOUNT_PROGRAM		100005
#define MOUNT_VERSION		1
#define MOUNT_MNT		1
#define MOUNT_UMNT		3
 */

static struct rpc_clnt *	mnt_create(char *, struct sockaddr_in *,
								int, int);
static struct rpc_program	mnt_program;

struct mnt_fhstatus {
	unsigned int		status;
	struct nfs_fh *		fh;
};

/*
 * Obtain an NFS file handle for the given host and path
 */
int
nfsroot_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh,
		int version, int protocol)
{
	struct rpc_clnt		*mnt_clnt;
	struct mnt_fhstatus	result = {
		.fh		= fh
	};
	struct rpc_message msg	= {
		.rpc_argp	= path,
		.rpc_resp	= &result,
	};
	char			hostname[32];
	int			status;

	dprintk("NFS:      nfs_mount(%08x:%s)\n",
			(unsigned)ntohl(addr->sin_addr.s_addr), path);

	sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(addr->sin_addr.s_addr));
	mnt_clnt = mnt_create(hostname, addr, version, protocol);
	if (IS_ERR(mnt_clnt))
		return PTR_ERR(mnt_clnt);

	if (version == NFS_MNT3_VERSION)
		msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
	else
		msg.rpc_proc = &mnt_clnt->cl_procinfo[MNTPROC_MNT];

	status = rpc_call_sync(mnt_clnt, &msg, 0);
	return status < 0? status : (result.status? -EACCES : 0);
}

static struct rpc_clnt *
mnt_create(char *hostname, struct sockaddr_in *srvaddr, int version,
		int protocol)
{
	struct rpc_create_args args = {
		.protocol	= protocol,
		.address	= (struct sockaddr *)srvaddr,
		.addrsize	= sizeof(*srvaddr),
		.servername	= hostname,
		.program	= &mnt_program,
		.version	= version,
		.authflavor	= RPC_AUTH_UNIX,
		.flags		= (RPC_CLNT_CREATE_ONESHOT |
				   RPC_CLNT_CREATE_INTR),
	};

	return rpc_create(&args);
}

/*
 * XDR encode/decode functions for MOUNT
 */
static int
xdr_encode_dirpath(struct rpc_rqst *req, __be32 *p, const char *path)
{
	p = xdr_encode_string(p, path);

	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	return 0;
}

static int
xdr_decode_fhstatus(struct rpc_rqst *req, __be32 *p, struct mnt_fhstatus *res)
{
	struct nfs_fh *fh = res->fh;

	if ((res->status = ntohl(*p++)) == 0) {
		fh->size = NFS2_FHSIZE;
		memcpy(fh->data, p, NFS2_FHSIZE);
	}
	return 0;
}

static int
xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p, struct mnt_fhstatus *res)
{
	struct nfs_fh *fh = res->fh;

	if ((res->status = ntohl(*p++)) == 0) {
		int size = ntohl(*p++);
		if (size <= NFS3_FHSIZE) {
			fh->size = size;
			memcpy(fh->data, p, size);
		} else
			res->status = -EBADHANDLE;
	}
	return 0;
}

#define MNT_dirpath_sz		(1 + 256)
#define MNT_fhstatus_sz		(1 + 8)

static struct rpc_procinfo	mnt_procedures[] = {
[MNTPROC_MNT] = {
	  .p_proc		= MNTPROC_MNT,
	  .p_encode		= (kxdrproc_t) xdr_encode_dirpath,	
	  .p_decode		= (kxdrproc_t) xdr_decode_fhstatus,
	  .p_bufsiz		= MNT_dirpath_sz << 2,
	  .p_statidx		= MNTPROC_MNT,
	  .p_name		= "MOUNT",
	},
};

static struct rpc_procinfo mnt3_procedures[] = {
[MOUNTPROC3_MNT] = {
	  .p_proc		= MOUNTPROC3_MNT,
	  .p_encode		= (kxdrproc_t) xdr_encode_dirpath,
	  .p_decode		= (kxdrproc_t) xdr_decode_fhstatus3,
	  .p_bufsiz		= MNT_dirpath_sz << 2,
	  .p_statidx		= MOUNTPROC3_MNT,
	  .p_name		= "MOUNT",
	},
};


static struct rpc_version	mnt_version1 = {
		.number		= 1,
		.nrprocs 	= 2,
		.procs 		= mnt_procedures
};

static struct rpc_version       mnt_version3 = {
		.number		= 3,
		.nrprocs	= 2,
		.procs		= mnt3_procedures
};

static struct rpc_version *	mnt_version[] = {
	NULL,
	&mnt_version1,
	NULL,
	&mnt_version3,
};

static struct rpc_stat		mnt_stats;

static struct rpc_program	mnt_program = {
	.name		= "mount",
	.number		= NFS_MNT_PROGRAM,
	.nrvers		= ARRAY_SIZE(mnt_version),
	.version	= mnt_version,
	.stats		= &mnt_stats,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/nfs/mount_clnt.c
	3	*
	4	* MOUNT client to support NFSroot.
	5	*
	6	* Copyright (C) 1997, Olaf Kirch <[email protected]>
	7	*/
	8
	9	#include <linux/types.h>
	10	#include <linux/socket.h>
	11	#include <linux/kernel.h>
	12	#include <linux/errno.h>
	13	#include <linux/uio.h>
	14	#include <linux/net.h>
	15	#include <linux/in.h>
	16	#include <linux/sunrpc/clnt.h>
1da177e4 LT	17	#include <linux/sunrpc/sched.h>
	18	#include <linux/nfs_fs.h>
	19
	20	#ifdef RPC_DEBUG
	21	# define NFSDBG_FACILITY NFSDBG_ROOT
	22	#endif
	23
	24	/*
	25	#define MOUNT_PROGRAM 100005
	26	#define MOUNT_VERSION 1
	27	#define MOUNT_MNT 1
	28	#define MOUNT_UMNT 3
	29	*/
	30
	31	static struct rpc_clnt * mnt_create(char , struct sockaddr_in ,
	32	int, int);
	33	static struct rpc_program mnt_program;
	34
	35	struct mnt_fhstatus {
	36	unsigned int status;
	37	struct nfs_fh * fh;
	38	};
	39
	40	/*
	41	* Obtain an NFS file handle for the given host and path
	42	*/
	43	int
	44	nfsroot_mount(struct sockaddr_in addr, char path, struct nfs_fh *fh,
	45	int version, int protocol)
	46	{
	47	struct rpc_clnt *mnt_clnt;
	48	struct mnt_fhstatus result = {
	49	.fh = fh
	50	};
dead28da CL	51	struct rpc_message msg = {
	52	.rpc_argp = path,
	53	.rpc_resp = &result,
	54	};
1da177e4 LT	55	char hostname[32];
1da177e4 LT	56	int status;
1da177e4 LT	57
	58	dprintk("NFS: nfs_mount(%08x:%s)\n",
	59	(unsigned)ntohl(addr->sin_addr.s_addr), path);
	60
	61	sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(addr->sin_addr.s_addr));
	62	mnt_clnt = mnt_create(hostname, addr, version, protocol);
	63	if (IS_ERR(mnt_clnt))
	64	return PTR_ERR(mnt_clnt);
	65
dead28da CL	66	if (version == NFS_MNT3_VERSION)
	67	msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
	68	else
	69	msg.rpc_proc = &mnt_clnt->cl_procinfo[MNTPROC_MNT];
	70
	71	status = rpc_call_sync(mnt_clnt, &msg, 0);
1da177e4 LT	72	return status < 0? status : (result.status? -EACCES : 0);
	73	}
	74
	75	static struct rpc_clnt *
	76	mnt_create(char hostname, struct sockaddr_in srvaddr, int version,
	77	int protocol)
	78	{
058ad9cb CL	79	struct rpc_create_args args = {
	80	.protocol = protocol,
	81	.address = (struct sockaddr *)srvaddr,
	82	.addrsize = sizeof(*srvaddr),
	83	.servername = hostname,
	84	.program = &mnt_program,
	85	.version = version,
	86	.authflavor = RPC_AUTH_UNIX,
	87	.flags = (RPC_CLNT_CREATE_ONESHOT \|
	88	RPC_CLNT_CREATE_INTR),
	89	};
	90
	91	return rpc_create(&args);
1da177e4 LT	92	}
	93
	94	/*
	95	* XDR encode/decode functions for MOUNT
	96	*/
	97	static int
d21ec0c3	98	xdr_encode_dirpath(struct rpc_rqst req, __be32 p, const char *path)
1da177e4 LT	99	{
	100	p = xdr_encode_string(p, path);
	101
	102	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	103	return 0;
	104	}
	105
	106	static int
d21ec0c3	107	xdr_decode_fhstatus(struct rpc_rqst req, __be32 p, struct mnt_fhstatus *res)
1da177e4 LT	108	{
	109	struct nfs_fh *fh = res->fh;
	110
	111	if ((res->status = ntohl(*p++)) == 0) {
	112	fh->size = NFS2_FHSIZE;
	113	memcpy(fh->data, p, NFS2_FHSIZE);
	114	}
	115	return 0;
	116	}
	117
	118	static int
d21ec0c3	119	xdr_decode_fhstatus3(struct rpc_rqst req, __be32 p, struct mnt_fhstatus *res)
1da177e4 LT	120	{
	121	struct nfs_fh *fh = res->fh;
	122
	123	if ((res->status = ntohl(*p++)) == 0) {
	124	int size = ntohl(*p++);
	125	if (size <= NFS3_FHSIZE) {
	126	fh->size = size;
	127	memcpy(fh->data, p, size);
	128	} else
	129	res->status = -EBADHANDLE;
	130	}
	131	return 0;
	132	}
	133
	134	#define MNT_dirpath_sz (1 + 256)
	135	#define MNT_fhstatus_sz (1 + 8)
	136
	137	static struct rpc_procinfo mnt_procedures[] = {
	138	[MNTPROC_MNT] = {
	139	.p_proc = MNTPROC_MNT,
	140	.p_encode = (kxdrproc_t) xdr_encode_dirpath,
	141	.p_decode = (kxdrproc_t) xdr_decode_fhstatus,
	142	.p_bufsiz = MNT_dirpath_sz << 2,
cc0175c1 CL	143	.p_statidx = MNTPROC_MNT,
cc0175c1 CL	144	.p_name = "MOUNT",
1da177e4 LT	145	},
	146	};
	147
	148	static struct rpc_procinfo mnt3_procedures[] = {
	149	[MOUNTPROC3_MNT] = {
	150	.p_proc = MOUNTPROC3_MNT,
	151	.p_encode = (kxdrproc_t) xdr_encode_dirpath,
	152	.p_decode = (kxdrproc_t) xdr_decode_fhstatus3,
	153	.p_bufsiz = MNT_dirpath_sz << 2,
cc0175c1 CL	154	.p_statidx = MOUNTPROC3_MNT,
cc0175c1 CL	155	.p_name = "MOUNT",
1da177e4 LT	156	},
	157	};
	158
	159
	160	static struct rpc_version mnt_version1 = {
	161	.number = 1,
	162	.nrprocs = 2,
	163	.procs = mnt_procedures
	164	};
	165
	166	static struct rpc_version mnt_version3 = {
	167	.number = 3,
	168	.nrprocs = 2,
	169	.procs = mnt3_procedures
	170	};
	171
	172	static struct rpc_version * mnt_version[] = {
	173	NULL,
	174	&mnt_version1,
	175	NULL,
	176	&mnt_version3,
	177	};
	178
	179	static struct rpc_stat mnt_stats;
	180
	181	static struct rpc_program mnt_program = {
	182	.name = "mount",
	183	.number = NFS_MNT_PROGRAM,
e8c96f8c	184	.nrvers = ARRAY_SIZE(mnt_version),
1da177e4 LT	185	.version = mnt_version,
	186	.stats = &mnt_stats,
	187	};