[GitHub/mt8127/android_kernel_alcatel_ttab.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/sched.h>
#include <linux/nfs_fs.h>

#ifdef RPC_DEBUG
# define NFSDBG_FACILITY	NFSDBG_MOUNT
#endif

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

static struct rpc_program	mnt_program;

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

/**
 * nfs_mount - Obtain an NFS file handle for the given host and path
 * @addr: pointer to server's address
 * @len: size of server's address
 * @hostname: name of server host, or NULL
 * @path: pointer to string containing export path to mount
 * @version: mount version to use for this request
 * @protocol: transport protocol to use for thie request
 * @fh: pointer to location to place returned file handle
 *
 * Uses default timeout parameters specified by underlying transport.
 */
int nfs_mount(struct sockaddr *addr, size_t len, char *hostname, char *path,
	      int version, int protocol, struct nfs_fh *fh)
{
	struct mnt_fhstatus	result = {
		.fh		= fh
	};
	struct rpc_message msg	= {
		.rpc_argp	= path,
		.rpc_resp	= &result,
	};
	struct rpc_create_args args = {
		.protocol	= protocol,
		.address	= addr,
		.addrsize	= len,
		.servername	= hostname,
		.program	= &mnt_program,
		.version	= version,
		.authflavor	= RPC_AUTH_UNIX,
		.flags		= RPC_CLNT_CREATE_INTR,
	};
	struct rpc_clnt		*mnt_clnt;
	int			status;

	dprintk("NFS: sending MNT request for %s:%s\n",
		(hostname ? hostname : "server"), path);

	mnt_clnt = rpc_create(&args);
	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);
	rpc_shutdown_client(mnt_clnt);
	return status < 0? status : (result.status? -EACCES : 0);
}

/*
 * 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)
#define MNT_fhstatus3_sz	(1 + 16)

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_arglen		= MNT_dirpath_sz,
	  .p_replen		= MNT_fhstatus_sz,
	  .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_arglen		= MNT_dirpath_sz,
	  .p_replen		= MNT_fhstatus3_sz,
	  .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 <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>
1da177e4 LT	17	#include <linux/sunrpc/sched.h>
	18	#include <linux/nfs_fs.h>
	19
	20	#ifdef RPC_DEBUG
3ea97309	21	# define NFSDBG_FACILITY NFSDBG_MOUNT
1da177e4 LT	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
1da177e4 LT	31	static struct rpc_program mnt_program;
	32
	33	struct mnt_fhstatus {
	34	unsigned int status;
	35	struct nfs_fh * fh;
	36	};
	37
3ea97309 CL	38	/**
	39	* nfs_mount - Obtain an NFS file handle for the given host and path
	40	* @addr: pointer to server's address
	41	* @len: size of server's address
	42	* @hostname: name of server host, or NULL
	43	* @path: pointer to string containing export path to mount
	44	* @version: mount version to use for this request
	45	* @protocol: transport protocol to use for thie request
	46	* @fh: pointer to location to place returned file handle
	47	*
	48	* Uses default timeout parameters specified by underlying transport.
1da177e4	49	*/
3ea97309 CL	50	int nfs_mount(struct sockaddr addr, size_t len, char hostname, char *path,
3ea97309 CL	51	int version, int protocol, struct nfs_fh *fh)
1da177e4	52	{
1da177e4 LT	53	struct mnt_fhstatus result = {
	54	.fh = fh
	55	};
dead28da CL	56	struct rpc_message msg = {
	57	.rpc_argp = path,
	58	.rpc_resp = &result,
	59	};
3ea97309 CL	60	struct rpc_create_args args = {
	61	.protocol = protocol,
	62	.address = addr,
	63	.addrsize = len,
	64	.servername = hostname,
	65	.program = &mnt_program,
	66	.version = version,
	67	.authflavor = RPC_AUTH_UNIX,
	68	.flags = RPC_CLNT_CREATE_INTR,
	69	};
	70	struct rpc_clnt *mnt_clnt;
1da177e4	71	int status;
1da177e4	72
3ea97309 CL	73	dprintk("NFS: sending MNT request for %s:%s\n",
3ea97309 CL	74	(hostname ? hostname : "server"), path);
1da177e4	75
3ea97309	76	mnt_clnt = rpc_create(&args);
1da177e4 LT	77	if (IS_ERR(mnt_clnt))
	78	return PTR_ERR(mnt_clnt);
	79
dead28da CL	80	if (version == NFS_MNT3_VERSION)
	81	msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
	82	else
	83	msg.rpc_proc = &mnt_clnt->cl_procinfo[MNTPROC_MNT];
	84
	85	status = rpc_call_sync(mnt_clnt, &msg, 0);
90c5755f	86	rpc_shutdown_client(mnt_clnt);
1da177e4 LT	87	return status < 0? status : (result.status? -EACCES : 0);
	88	}
	89
1da177e4 LT	90	/*
	91	* XDR encode/decode functions for MOUNT
	92	*/
	93	static int
d21ec0c3	94	xdr_encode_dirpath(struct rpc_rqst req, __be32 p, const char *path)
1da177e4 LT	95	{
	96	p = xdr_encode_string(p, path);
	97
	98	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	99	return 0;
	100	}
	101
	102	static int
d21ec0c3	103	xdr_decode_fhstatus(struct rpc_rqst req, __be32 p, struct mnt_fhstatus *res)
1da177e4 LT	104	{
	105	struct nfs_fh *fh = res->fh;
	106
	107	if ((res->status = ntohl(*p++)) == 0) {
	108	fh->size = NFS2_FHSIZE;
	109	memcpy(fh->data, p, NFS2_FHSIZE);
	110	}
	111	return 0;
	112	}
	113
	114	static int
d21ec0c3	115	xdr_decode_fhstatus3(struct rpc_rqst req, __be32 p, struct mnt_fhstatus *res)
1da177e4 LT	116	{
	117	struct nfs_fh *fh = res->fh;
	118
	119	if ((res->status = ntohl(*p++)) == 0) {
	120	int size = ntohl(*p++);
	121	if (size <= NFS3_FHSIZE) {
	122	fh->size = size;
	123	memcpy(fh->data, p, size);
	124	} else
	125	res->status = -EBADHANDLE;
	126	}
	127	return 0;
	128	}
	129
	130	#define MNT_dirpath_sz (1 + 256)
	131	#define MNT_fhstatus_sz (1 + 8)
2bea90d4	132	#define MNT_fhstatus3_sz (1 + 16)
1da177e4 LT	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,
2bea90d4 CL	139	.p_arglen = MNT_dirpath_sz,
2bea90d4 CL	140	.p_replen = MNT_fhstatus_sz,
cc0175c1 CL	141	.p_statidx = MNTPROC_MNT,
cc0175c1 CL	142	.p_name = "MOUNT",
1da177e4 LT	143	},
	144	};
	145
	146	static struct rpc_procinfo mnt3_procedures[] = {
	147	[MOUNTPROC3_MNT] = {
	148	.p_proc = MOUNTPROC3_MNT,
	149	.p_encode = (kxdrproc_t) xdr_encode_dirpath,
	150	.p_decode = (kxdrproc_t) xdr_decode_fhstatus3,
2bea90d4 CL	151	.p_arglen = MNT_dirpath_sz,
2bea90d4 CL	152	.p_replen = MNT_fhstatus3_sz,
cc0175c1 CL	153	.p_statidx = MOUNTPROC3_MNT,
cc0175c1 CL	154	.p_name = "MOUNT",
1da177e4 LT	155	},
	156	};
	157
	158
	159	static struct rpc_version mnt_version1 = {
	160	.number = 1,
	161	.nrprocs = 2,
	162	.procs = mnt_procedures
	163	};
	164
	165	static struct rpc_version mnt_version3 = {
	166	.number = 3,
	167	.nrprocs = 2,
	168	.procs = mnt3_procedures
	169	};
	170
	171	static struct rpc_version * mnt_version[] = {
	172	NULL,
	173	&mnt_version1,
	174	NULL,
	175	&mnt_version3,
	176	};
	177
	178	static struct rpc_stat mnt_stats;
	179
	180	static struct rpc_program mnt_program = {
	181	.name = "mount",
	182	.number = NFS_MNT_PROGRAM,
e8c96f8c	183	.nrvers = ARRAY_SIZE(mnt_version),
1da177e4 LT	184	.version = mnt_version,
	185	.stats = &mnt_stats,
	186	};