[mirror_ubuntu-artful-kernel.git] / fs / nfs / mount_clnt.c

/*
 * linux/fs/nfs/mount_clnt.c
 *
 * MOUNT client to support NFSroot.
 *
 * Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de>
 */

#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/xprt.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
	};
	char			hostname[32];
	int			status;
	int			call;

	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);

	call = (version == NFS_MNT3_VERSION) ? MOUNTPROC3_MNT : MNTPROC_MNT;
	status = rpc_call(mnt_clnt, call, path, &result, 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_xprt	*xprt;
	struct rpc_clnt	*clnt;

	xprt = xprt_create_proto(protocol, srvaddr, NULL);
	if (IS_ERR(xprt))
		return (struct rpc_clnt *)xprt;

	clnt = rpc_create_client(xprt, hostname,
				&mnt_program, version,
				RPC_AUTH_UNIX);
	if (!IS_ERR(clnt)) {
		clnt->cl_softrtry = 1;
		clnt->cl_oneshot  = 1;
		clnt->cl_intr = 1;
	}
	return clnt;
}

/*
 * XDR encode/decode functions for MOUNT
 */
static int
xdr_encode_dirpath(struct rpc_rqst *req, u32 *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, u32 *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, u32 *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,
	},
};

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,
	},
};


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		= sizeof(mnt_version)/sizeof(mnt_version[0]),
	.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 <okir@monad.swb.de>
	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>
	17	#include <linux/sunrpc/xprt.h>
	18	#include <linux/sunrpc/sched.h>
	19	#include <linux/nfs_fs.h>
	20
	21	#ifdef RPC_DEBUG
	22	# define NFSDBG_FACILITY NFSDBG_ROOT
	23	#endif
	24
	25	/*
	26	#define MOUNT_PROGRAM 100005
	27	#define MOUNT_VERSION 1
	28	#define MOUNT_MNT 1
	29	#define MOUNT_UMNT 3
	30	*/
	31
	32	static struct rpc_clnt * mnt_create(char , struct sockaddr_in ,
	33	int, int);
	34	static struct rpc_program mnt_program;
	35
	36	struct mnt_fhstatus {
	37	unsigned int status;
	38	struct nfs_fh * fh;
	39	};
	40
	41	/*
	42	* Obtain an NFS file handle for the given host and path
	43	*/
	44	int
	45	nfsroot_mount(struct sockaddr_in addr, char path, struct nfs_fh *fh,
	46	int version, int protocol)
	47	{
	48	struct rpc_clnt *mnt_clnt;
	49	struct mnt_fhstatus result = {
	50	.fh = fh
	51	};
	52	char hostname[32];
	53	int status;
	54	int call;
	55
	56	dprintk("NFS: nfs_mount(%08x:%s)\n",
	57	(unsigned)ntohl(addr->sin_addr.s_addr), path);
	58
	59	sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(addr->sin_addr.s_addr));
	60	mnt_clnt = mnt_create(hostname, addr, version, protocol);
	61	if (IS_ERR(mnt_clnt))
	62	return PTR_ERR(mnt_clnt);
	63
	64	call = (version == NFS_MNT3_VERSION) ? MOUNTPROC3_MNT : MNTPROC_MNT;
65	status = rpc_call(mnt_clnt, call, path, &result, 0);
66	return status < 0? status : (result.status? -EACCES : 0);
67	}
68
69	static struct rpc_clnt *
70	mnt_create(char hostname, struct sockaddr_in srvaddr, int version,
71	int protocol)
72	{
73	struct rpc_xprt *xprt;
74	struct rpc_clnt *clnt;
75
76	xprt = xprt_create_proto(protocol, srvaddr, NULL);
77	if (IS_ERR(xprt))
78	return (struct rpc_clnt *)xprt;
79
80	clnt = rpc_create_client(xprt, hostname,
81	&mnt_program, version,
82	RPC_AUTH_UNIX);
5b616f5d	83	if (!IS_ERR(clnt)) {
1da177e4	84	clnt->cl_softrtry = 1;
1da177e4 LT	85	clnt->cl_oneshot = 1;
	86	clnt->cl_intr = 1;
	87	}
	88	return clnt;
	89	}
	90
	91	/*
	92	* XDR encode/decode functions for MOUNT
	93	*/
	94	static int
	95	xdr_encode_dirpath(struct rpc_rqst req, u32 p, const char *path)
	96	{
	97	p = xdr_encode_string(p, path);
	98
	99	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	100	return 0;
	101	}
	102
	103	static int
	104	xdr_decode_fhstatus(struct rpc_rqst req, u32 p, struct mnt_fhstatus *res)
	105	{
	106	struct nfs_fh *fh = res->fh;
	107
	108	if ((res->status = ntohl(*p++)) == 0) {
	109	fh->size = NFS2_FHSIZE;
	110	memcpy(fh->data, p, NFS2_FHSIZE);
	111	}
	112	return 0;
	113	}
	114
	115	static int
	116	xdr_decode_fhstatus3(struct rpc_rqst req, u32 p, struct mnt_fhstatus *res)
	117	{
	118	struct nfs_fh *fh = res->fh;
	119
	120	if ((res->status = ntohl(*p++)) == 0) {
	121	int size = ntohl(*p++);
	122	if (size <= NFS3_FHSIZE) {
	123	fh->size = size;
	124	memcpy(fh->data, p, size);
	125	} else
	126	res->status = -EBADHANDLE;
	127	}
	128	return 0;
	129	}
	130
	131	#define MNT_dirpath_sz (1 + 256)
	132	#define MNT_fhstatus_sz (1 + 8)
	133
	134	static struct rpc_procinfo mnt_procedures[] = {
	135	[MNTPROC_MNT] = {
	136	.p_proc = MNTPROC_MNT,
	137	.p_encode = (kxdrproc_t) xdr_encode_dirpath,
	138	.p_decode = (kxdrproc_t) xdr_decode_fhstatus,
	139	.p_bufsiz = MNT_dirpath_sz << 2,
	140	},
	141	};
	142
	143	static struct rpc_procinfo mnt3_procedures[] = {
	144	[MOUNTPROC3_MNT] = {
	145	.p_proc = MOUNTPROC3_MNT,
	146	.p_encode = (kxdrproc_t) xdr_encode_dirpath,
	147	.p_decode = (kxdrproc_t) xdr_decode_fhstatus3,
	148	.p_bufsiz = MNT_dirpath_sz << 2,
149	},
150	};
151
152
153	static struct rpc_version mnt_version1 = {
154	.number = 1,
155	.nrprocs = 2,
156	.procs = mnt_procedures
157	};
158
159	static struct rpc_version mnt_version3 = {
160	.number = 3,
161	.nrprocs = 2,
162	.procs = mnt3_procedures
163	};
164
165	static struct rpc_version * mnt_version[] = {
166	NULL,
167	&mnt_version1,
168	NULL,
169	&mnt_version3,
170	};
171
172	static struct rpc_stat mnt_stats;
173
174	static struct rpc_program mnt_program = {
175	.name = "mount",
176	.number = NFS_MNT_PROGRAM,
177	.nrvers = sizeof(mnt_version)/sizeof(mnt_version[0]),
178	.version = mnt_version,
179	.stats = &mnt_stats,
180	};