[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / nfs / mount_clnt.c

/*
 * In-kernel MOUNT protocol client
 *
 * 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>
#include "internal.h"

#ifdef RPC_DEBUG
# define NFSDBG_FACILITY	NFSDBG_MOUNT
#endif

/*
 * Defined by RFC 1094, section A.3; and RFC 1813, section 5.1.4
 */
#define MNTPATHLEN		(1024)

/*
 * XDR data type sizes
 */
#define encode_dirpath_sz	(1 + XDR_QUADLEN(MNTPATHLEN))
#define MNT_status_sz		(1)
#define MNT_fhs_status_sz	(1)
#define MNT_fhandle_sz		XDR_QUADLEN(NFS2_FHSIZE)
#define MNT_fhandle3_sz		(1 + XDR_QUADLEN(NFS3_FHSIZE))
#define MNT_authflav3_sz	(1 + NFS_MAX_SECFLAVORS)

/*
 * XDR argument and result sizes
 */
#define MNT_enc_dirpath_sz	encode_dirpath_sz
#define MNT_dec_mountres_sz	(MNT_status_sz + MNT_fhandle_sz)
#define MNT_dec_mountres3_sz	(MNT_status_sz + MNT_fhandle_sz + \
				 MNT_authflav3_sz)

/*
 * Defined by RFC 1094, section A.5
 */
enum {
	MOUNTPROC_NULL		= 0,
	MOUNTPROC_MNT		= 1,
	MOUNTPROC_DUMP		= 2,
	MOUNTPROC_UMNT		= 3,
	MOUNTPROC_UMNTALL	= 4,
	MOUNTPROC_EXPORT	= 5,
};

/*
 * Defined by RFC 1813, section 5.2
 */
enum {
	MOUNTPROC3_NULL		= 0,
	MOUNTPROC3_MNT		= 1,
	MOUNTPROC3_DUMP		= 2,
	MOUNTPROC3_UMNT		= 3,
	MOUNTPROC3_UMNTALL	= 4,
	MOUNTPROC3_EXPORT	= 5,
};

static struct rpc_program	mnt_program;

/*
 * Defined by OpenGroup XNFS Version 3W, chapter 8
 */
enum mountstat {
	MNT_OK			= 0,
	MNT_EPERM		= 1,
	MNT_ENOENT		= 2,
	MNT_EACCES		= 13,
	MNT_EINVAL		= 22,
};

static struct {
	u32 status;
	int errno;
} mnt_errtbl[] = {
	{ .status = MNT_OK,			.errno = 0,		},
	{ .status = MNT_EPERM,			.errno = -EPERM,	},
	{ .status = MNT_ENOENT,			.errno = -ENOENT,	},
	{ .status = MNT_EACCES,			.errno = -EACCES,	},
	{ .status = MNT_EINVAL,			.errno = -EINVAL,	},
};

/*
 * Defined by RFC 1813, section 5.1.5
 */
enum mountstat3 {
	MNT3_OK			= 0,		/* no error */
	MNT3ERR_PERM		= 1,		/* Not owner */
	MNT3ERR_NOENT		= 2,		/* No such file or directory */
	MNT3ERR_IO		= 5,		/* I/O error */
	MNT3ERR_ACCES		= 13,		/* Permission denied */
	MNT3ERR_NOTDIR		= 20,		/* Not a directory */
	MNT3ERR_INVAL		= 22,		/* Invalid argument */
	MNT3ERR_NAMETOOLONG	= 63,		/* Filename too long */
	MNT3ERR_NOTSUPP		= 10004,	/* Operation not supported */
	MNT3ERR_SERVERFAULT	= 10006,	/* A failure on the server */
};

static struct {
	u32 status;
	int errno;
} mnt3_errtbl[] = {
	{ .status = MNT3_OK,			.errno = 0,		},
	{ .status = MNT3ERR_PERM,		.errno = -EPERM,	},
	{ .status = MNT3ERR_NOENT,		.errno = -ENOENT,	},
	{ .status = MNT3ERR_IO,			.errno = -EIO,		},
	{ .status = MNT3ERR_ACCES,		.errno = -EACCES,	},
	{ .status = MNT3ERR_NOTDIR,		.errno = -ENOTDIR,	},
	{ .status = MNT3ERR_INVAL,		.errno = -EINVAL,	},
	{ .status = MNT3ERR_NAMETOOLONG,	.errno = -ENAMETOOLONG,	},
	{ .status = MNT3ERR_NOTSUPP,		.errno = -ENOTSUPP,	},
	{ .status = MNT3ERR_SERVERFAULT,	.errno = -ESERVERFAULT,	},
};

struct mountres {
	int errno;
	struct nfs_fh *fh;
	unsigned int *auth_count;
	rpc_authflavor_t *auth_flavors;
};

struct mnt_fhstatus {
	u32 status;
	struct nfs_fh *fh;
};

/**
 * nfs_mount - Obtain an NFS file handle for the given host and path
 * @info: pointer to mount request arguments
 *
 * Uses default timeout parameters specified by underlying transport.
 */
int nfs_mount(struct nfs_mount_request *info)
{
	struct mountres	result = {
		.fh		= info->fh,
		.auth_count	= info->auth_flav_len,
		.auth_flavors	= info->auth_flavs,
	};
	struct rpc_message msg	= {
		.rpc_argp	= info->dirpath,
		.rpc_resp	= &result,
	};
	struct rpc_create_args args = {
		.protocol	= info->protocol,
		.address	= info->sap,
		.addrsize	= info->salen,
		.servername	= info->hostname,
		.program	= &mnt_program,
		.version	= info->version,
		.authflavor	= RPC_AUTH_UNIX,
	};
	struct rpc_clnt		*mnt_clnt;
	int			status;

	dprintk("NFS: sending MNT request for %s:%s\n",
		(info->hostname ? info->hostname : "server"),
			info->dirpath);

	if (info->noresvport)
		args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;

	mnt_clnt = rpc_create(&args);
	if (IS_ERR(mnt_clnt))
		goto out_clnt_err;

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

	status = rpc_call_sync(mnt_clnt, &msg, 0);
	rpc_shutdown_client(mnt_clnt);

	if (status < 0)
		goto out_call_err;
	if (result.errno != 0)
		goto out_mnt_err;

	dprintk("NFS: MNT request succeeded\n");
	status = 0;

out:
	return status;

out_clnt_err:
	status = PTR_ERR(mnt_clnt);
	dprintk("NFS: failed to create MNT RPC client, status=%d\n", status);
	goto out;

out_call_err:
	dprintk("NFS: MNT request failed, status=%d\n", status);
	goto out;

out_mnt_err:
	dprintk("NFS: MNT server returned result %d\n", result.errno);
	status = result.errno;
	goto out;
}

/*
 * XDR encode/decode functions for MOUNT
 */

static int encode_mntdirpath(struct xdr_stream *xdr, const char *pathname)
{
	const u32 pathname_len = strlen(pathname);
	__be32 *p;

	if (unlikely(pathname_len > MNTPATHLEN))
		return -EIO;

	p = xdr_reserve_space(xdr, sizeof(u32) + pathname_len);
	if (unlikely(p == NULL))
		return -EIO;
	xdr_encode_opaque(p, pathname, pathname_len);

	return 0;
}

static int mnt_enc_dirpath(struct rpc_rqst *req, __be32 *p,
			   const char *dirpath)
{
	struct xdr_stream xdr;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	return encode_mntdirpath(&xdr, dirpath);
}

/*
 * RFC 1094: "A non-zero status indicates some sort of error.  In this
 * case, the status is a UNIX error number."  This can be problematic
 * if the server and client use different errno values for the same
 * error.
 *
 * However, the OpenGroup XNFS spec provides a simple mapping that is
 * independent of local errno values on the server and the client.
 */
static int decode_status(struct xdr_stream *xdr, struct mountres *res)
{
	unsigned int i;
	u32 status;
	__be32 *p;

	p = xdr_inline_decode(xdr, sizeof(status));
	if (unlikely(p == NULL))
		return -EIO;
	status = ntohl(*p);

	for (i = 0; i <= ARRAY_SIZE(mnt_errtbl); i++) {
		if (mnt_errtbl[i].status == status) {
			res->errno = mnt_errtbl[i].errno;
			return 0;
		}
	}

	dprintk("NFS: unrecognized MNT status code: %u\n", status);
	res->errno = -EACCES;
	return 0;
}

static int decode_fhandle(struct xdr_stream *xdr, struct mountres *res)
{
	struct nfs_fh *fh = res->fh;
	__be32 *p;

	p = xdr_inline_decode(xdr, NFS2_FHSIZE);
	if (unlikely(p == NULL))
		return -EIO;

	fh->size = NFS2_FHSIZE;
	memcpy(fh->data, p, NFS2_FHSIZE);
	return 0;
}

static int mnt_dec_mountres(struct rpc_rqst *req, __be32 *p,
			    struct mountres *res)
{
	struct xdr_stream xdr;
	int status;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);

	status = decode_status(&xdr, res);
	if (unlikely(status != 0 || res->errno != 0))
		return status;
	return decode_fhandle(&xdr, res);
}

static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res)
{
	unsigned int i;
	u32 status;
	__be32 *p;

	p = xdr_inline_decode(xdr, sizeof(status));
	if (unlikely(p == NULL))
		return -EIO;
	status = ntohl(*p);

	for (i = 0; i <= ARRAY_SIZE(mnt3_errtbl); i++) {
		if (mnt3_errtbl[i].status == status) {
			res->errno = mnt3_errtbl[i].errno;
			return 0;
		}
	}

	dprintk("NFS: unrecognized MNT3 status code: %u\n", status);
	res->errno = -EACCES;
	return 0;
}

static int decode_fhandle3(struct xdr_stream *xdr, struct mountres *res)
{
	struct nfs_fh *fh = res->fh;
	u32 size;
	__be32 *p;

	p = xdr_inline_decode(xdr, sizeof(size));
	if (unlikely(p == NULL))
		return -EIO;

	size = ntohl(*p++);
	if (size > NFS3_FHSIZE || size == 0)
		return -EIO;

	p = xdr_inline_decode(xdr, size);
	if (unlikely(p == NULL))
		return -EIO;

	fh->size = size;
	memcpy(fh->data, p, size);
	return 0;
}

static int decode_auth_flavors(struct xdr_stream *xdr, struct mountres *res)
{
	rpc_authflavor_t *flavors = res->auth_flavors;
	unsigned int *count = res->auth_count;
	u32 entries, i;
	__be32 *p;

	if (*count == 0)
		return 0;

	p = xdr_inline_decode(xdr, sizeof(entries));
	if (unlikely(p == NULL))
		return -EIO;
	entries = ntohl(*p);
	dprintk("NFS: received %u auth flavors\n", entries);
	if (entries > NFS_MAX_SECFLAVORS)
		entries = NFS_MAX_SECFLAVORS;

	p = xdr_inline_decode(xdr, sizeof(u32) * entries);
	if (unlikely(p == NULL))
		return -EIO;

	if (entries > *count)
		entries = *count;

	for (i = 0; i < entries; i++) {
		flavors[i] = ntohl(*p++);
		dprintk("NFS:\tflavor %u: %d\n", i, flavors[i]);
	}
	*count = i;

	return 0;
}

static int mnt_dec_mountres3(struct rpc_rqst *req, __be32 *p,
			     struct mountres *res)
{
	struct xdr_stream xdr;
	int status;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);

	status = decode_fhs_status(&xdr, res);
	if (unlikely(status != 0 || res->errno != 0))
		return status;
	status = decode_fhandle3(&xdr, res);
	if (unlikely(status != 0)) {
		res->errno = -EBADHANDLE;
		return 0;
	}
	return decode_auth_flavors(&xdr, res);
}

static struct rpc_procinfo mnt_procedures[] = {
	[MOUNTPROC_MNT] = {
		.p_proc		= MOUNTPROC_MNT,
		.p_encode	= (kxdrproc_t)mnt_enc_dirpath,
		.p_decode	= (kxdrproc_t)mnt_dec_mountres,
		.p_arglen	= MNT_enc_dirpath_sz,
		.p_replen	= MNT_dec_mountres_sz,
		.p_statidx	= MOUNTPROC_MNT,
		.p_name		= "MOUNT",
	},
};

static struct rpc_procinfo mnt3_procedures[] = {
	[MOUNTPROC3_MNT] = {
		.p_proc		= MOUNTPROC3_MNT,
		.p_encode	= (kxdrproc_t)mnt_enc_dirpath,
		.p_decode	= (kxdrproc_t)mnt_dec_mountres3,
		.p_arglen	= MNT_enc_dirpath_sz,
		.p_replen	= MNT_dec_mountres3_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	1	/*
19207231	2	* In-kernel MOUNT protocol client
1da177e4 LT	3	*
	4	* Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de>
	5	*/
	6
	7	#include <linux/types.h>
	8	#include <linux/socket.h>
	9	#include <linux/kernel.h>
	10	#include <linux/errno.h>
	11	#include <linux/uio.h>
	12	#include <linux/net.h>
	13	#include <linux/in.h>
	14	#include <linux/sunrpc/clnt.h>
1da177e4 LT	15	#include <linux/sunrpc/sched.h>
1da177e4 LT	16	#include <linux/nfs_fs.h>
8491945f	17	#include "internal.h"
1da177e4 LT	18
1da177e4 LT	19	#ifdef RPC_DEBUG
3ea97309	20	# define NFSDBG_FACILITY NFSDBG_MOUNT
1da177e4 LT	21	#endif
1da177e4 LT	22
29a1bd6b CL	23	/*
	24	* Defined by RFC 1094, section A.3; and RFC 1813, section 5.1.4
	25	*/
	26	#define MNTPATHLEN (1024)
	27
	28	/*
	29	* XDR data type sizes
	30	*/
	31	#define encode_dirpath_sz (1 + XDR_QUADLEN(MNTPATHLEN))
fb125295 CL	32	#define MNT_status_sz (1)
fb125295 CL	33	#define MNT_fhs_status_sz (1)
4fdcd996 CL	34	#define MNT_fhandle_sz XDR_QUADLEN(NFS2_FHSIZE)
4fdcd996 CL	35	#define MNT_fhandle3_sz (1 + XDR_QUADLEN(NFS3_FHSIZE))
a14017db	36	#define MNT_authflav3_sz (1 + NFS_MAX_SECFLAVORS)
29a1bd6b CL	37
	38	/*
	39	* XDR argument and result sizes
	40	*/
	41	#define MNT_enc_dirpath_sz encode_dirpath_sz
8e02f6b9 CL	42	#define MNT_dec_mountres_sz (MNT_status_sz + MNT_fhandle_sz)
	43	#define MNT_dec_mountres3_sz (MNT_status_sz + MNT_fhandle_sz + \
	44	MNT_authflav3_sz)
29a1bd6b	45
2ad78097 CL	46	/*
	47	* Defined by RFC 1094, section A.5
	48	*/
	49	enum {
	50	MOUNTPROC_NULL = 0,
	51	MOUNTPROC_MNT = 1,
	52	MOUNTPROC_DUMP = 2,
	53	MOUNTPROC_UMNT = 3,
	54	MOUNTPROC_UMNTALL = 4,
	55	MOUNTPROC_EXPORT = 5,
	56	};
	57
	58	/*
	59	* Defined by RFC 1813, section 5.2
	60	*/
	61	enum {
	62	MOUNTPROC3_NULL = 0,
	63	MOUNTPROC3_MNT = 1,
	64	MOUNTPROC3_DUMP = 2,
	65	MOUNTPROC3_UMNT = 3,
	66	MOUNTPROC3_UMNTALL = 4,
	67	MOUNTPROC3_EXPORT = 5,
	68	};
	69
1da177e4 LT	70	static struct rpc_program mnt_program;
1da177e4 LT	71
fb125295 CL	72	/*
	73	* Defined by OpenGroup XNFS Version 3W, chapter 8
	74	*/
	75	enum mountstat {
	76	MNT_OK = 0,
	77	MNT_EPERM = 1,
	78	MNT_ENOENT = 2,
	79	MNT_EACCES = 13,
	80	MNT_EINVAL = 22,
	81	};
	82
	83	static struct {
	84	u32 status;
	85	int errno;
	86	} mnt_errtbl[] = {
	87	{ .status = MNT_OK, .errno = 0, },
	88	{ .status = MNT_EPERM, .errno = -EPERM, },
	89	{ .status = MNT_ENOENT, .errno = -ENOENT, },
	90	{ .status = MNT_EACCES, .errno = -EACCES, },
	91	{ .status = MNT_EINVAL, .errno = -EINVAL, },
	92	};
	93
	94	/*
	95	* Defined by RFC 1813, section 5.1.5
	96	*/
	97	enum mountstat3 {
	98	MNT3_OK = 0, /* no error */
	99	MNT3ERR_PERM = 1, /* Not owner */
	100	MNT3ERR_NOENT = 2, /* No such file or directory */
	101	MNT3ERR_IO = 5, /* I/O error */
	102	MNT3ERR_ACCES = 13, /* Permission denied */
	103	MNT3ERR_NOTDIR = 20, /* Not a directory */
	104	MNT3ERR_INVAL = 22, /* Invalid argument */
	105	MNT3ERR_NAMETOOLONG = 63, /* Filename too long */
	106	MNT3ERR_NOTSUPP = 10004, /* Operation not supported */
	107	MNT3ERR_SERVERFAULT = 10006, /* A failure on the server */
	108	};
	109
	110	static struct {
	111	u32 status;
	112	int errno;
	113	} mnt3_errtbl[] = {
	114	{ .status = MNT3_OK, .errno = 0, },
	115	{ .status = MNT3ERR_PERM, .errno = -EPERM, },
	116	{ .status = MNT3ERR_NOENT, .errno = -ENOENT, },
	117	{ .status = MNT3ERR_IO, .errno = -EIO, },
	118	{ .status = MNT3ERR_ACCES, .errno = -EACCES, },
	119	{ .status = MNT3ERR_NOTDIR, .errno = -ENOTDIR, },
	120	{ .status = MNT3ERR_INVAL, .errno = -EINVAL, },
	121	{ .status = MNT3ERR_NAMETOOLONG, .errno = -ENAMETOOLONG, },
	122	{ .status = MNT3ERR_NOTSUPP, .errno = -ENOTSUPP, },
	123	{ .status = MNT3ERR_SERVERFAULT, .errno = -ESERVERFAULT, },
	124	};
	125
	126	struct mountres {
	127	int errno;
	128	struct nfs_fh *fh;
a14017db CL	129	unsigned int *auth_count;
a14017db CL	130	rpc_authflavor_t *auth_flavors;
fb125295 CL	131	};
fb125295 CL	132
1da177e4	133	struct mnt_fhstatus {
19207231 CL	134	u32 status;
19207231 CL	135	struct nfs_fh *fh;
1da177e4 LT	136	};
1da177e4 LT	137
3ea97309 CL	138	/**
3ea97309 CL	139	* nfs_mount - Obtain an NFS file handle for the given host and path
c5d120f8	140	* @info: pointer to mount request arguments
3ea97309 CL	141	*
3ea97309 CL	142	* Uses default timeout parameters specified by underlying transport.
1da177e4	143	*/
c5d120f8	144	int nfs_mount(struct nfs_mount_request *info)
1da177e4	145	{
8e02f6b9 CL	146	struct mountres result = {
	147	.fh = info->fh,
	148	.auth_count = info->auth_flav_len,
	149	.auth_flavors = info->auth_flavs,
1da177e4	150	};
dead28da	151	struct rpc_message msg = {
c5d120f8	152	.rpc_argp = info->dirpath,
dead28da CL	153	.rpc_resp = &result,
dead28da CL	154	};
3ea97309	155	struct rpc_create_args args = {
c5d120f8 CL	156	.protocol = info->protocol,
	157	.address = info->sap,
	158	.addrsize = info->salen,
	159	.servername = info->hostname,
3ea97309	160	.program = &mnt_program,
c5d120f8	161	.version = info->version,
3ea97309	162	.authflavor = RPC_AUTH_UNIX,
3ea97309 CL	163	};
3ea97309 CL	164	struct rpc_clnt *mnt_clnt;
1da177e4	165	int status;
1da177e4	166
3ea97309	167	dprintk("NFS: sending MNT request for %s:%s\n",
c5d120f8 CL	168	(info->hostname ? info->hostname : "server"),
c5d120f8 CL	169	info->dirpath);
1da177e4	170
50a737f8 CL	171	if (info->noresvport)
	172	args.flags \|= RPC_CLNT_CREATE_NONPRIVPORT;
	173
3ea97309	174	mnt_clnt = rpc_create(&args);
1da177e4	175	if (IS_ERR(mnt_clnt))
013a8c1a	176	goto out_clnt_err;
1da177e4	177
c5d120f8	178	if (info->version == NFS_MNT3_VERSION)
dead28da CL	179	msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
dead28da CL	180	else
2ad78097	181	msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT];
dead28da CL	182
dead28da CL	183	status = rpc_call_sync(mnt_clnt, &msg, 0);
90c5755f	184	rpc_shutdown_client(mnt_clnt);
013a8c1a CL	185
	186	if (status < 0)
	187	goto out_call_err;
8e02f6b9	188	if (result.errno != 0)
013a8c1a CL	189	goto out_mnt_err;
	190
	191	dprintk("NFS: MNT request succeeded\n");
	192	status = 0;
	193
	194	out:
	195	return status;
	196
	197	out_clnt_err:
	198	status = PTR_ERR(mnt_clnt);
8e02f6b9	199	dprintk("NFS: failed to create MNT RPC client, status=%d\n", status);
013a8c1a CL	200	goto out;
	201
	202	out_call_err:
8e02f6b9	203	dprintk("NFS: MNT request failed, status=%d\n", status);
013a8c1a CL	204	goto out;
	205
	206	out_mnt_err:
8e02f6b9 CL	207	dprintk("NFS: MNT server returned result %d\n", result.errno);
8e02f6b9 CL	208	status = result.errno;
013a8c1a	209	goto out;
1da177e4 LT	210	}
1da177e4 LT	211
1da177e4 LT	212	/*
	213	* XDR encode/decode functions for MOUNT
	214	*/
1da177e4	215
29a1bd6b CL	216	static int encode_mntdirpath(struct xdr_stream xdr, const char pathname)
	217	{
	218	const u32 pathname_len = strlen(pathname);
	219	__be32 *p;
	220
	221	if (unlikely(pathname_len > MNTPATHLEN))
	222	return -EIO;
	223
	224	p = xdr_reserve_space(xdr, sizeof(u32) + pathname_len);
	225	if (unlikely(p == NULL))
	226	return -EIO;
	227	xdr_encode_opaque(p, pathname, pathname_len);
	228
	229	return 0;
	230	}
	231
	232	static int mnt_enc_dirpath(struct rpc_rqst req, __be32 p,
	233	const char *dirpath)
	234	{
	235	struct xdr_stream xdr;
	236
	237	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	238	return encode_mntdirpath(&xdr, dirpath);
	239	}
	240
fb125295 CL	241	/*
	242	* RFC 1094: "A non-zero status indicates some sort of error. In this
	243	* case, the status is a UNIX error number." This can be problematic
	244	* if the server and client use different errno values for the same
	245	* error.
	246	*
	247	* However, the OpenGroup XNFS spec provides a simple mapping that is
	248	* independent of local errno values on the server and the client.
	249	*/
	250	static int decode_status(struct xdr_stream xdr, struct mountres res)
	251	{
	252	unsigned int i;
	253	u32 status;
	254	__be32 *p;
	255
	256	p = xdr_inline_decode(xdr, sizeof(status));
	257	if (unlikely(p == NULL))
	258	return -EIO;
	259	status = ntohl(*p);
	260
	261	for (i = 0; i <= ARRAY_SIZE(mnt_errtbl); i++) {
	262	if (mnt_errtbl[i].status == status) {
	263	res->errno = mnt_errtbl[i].errno;
	264	return 0;
	265	}
	266	}
	267
	268	dprintk("NFS: unrecognized MNT status code: %u\n", status);
	269	res->errno = -EACCES;
	270	return 0;
	271	}
	272
4fdcd996 CL	273	static int decode_fhandle(struct xdr_stream xdr, struct mountres res)
	274	{
	275	struct nfs_fh *fh = res->fh;
	276	__be32 *p;
	277
	278	p = xdr_inline_decode(xdr, NFS2_FHSIZE);
	279	if (unlikely(p == NULL))
	280	return -EIO;
	281
	282	fh->size = NFS2_FHSIZE;
	283	memcpy(fh->data, p, NFS2_FHSIZE);
	284	return 0;
	285	}
	286
8e02f6b9 CL	287	static int mnt_dec_mountres(struct rpc_rqst req, __be32 p,
	288	struct mountres *res)
	289	{
	290	struct xdr_stream xdr;
	291	int status;
	292
	293	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	294
	295	status = decode_status(&xdr, res);
	296	if (unlikely(status != 0 \|\| res->errno != 0))
	297	return status;
	298	return decode_fhandle(&xdr, res);
	299	}
	300
fb125295 CL	301	static int decode_fhs_status(struct xdr_stream xdr, struct mountres res)
	302	{
	303	unsigned int i;
	304	u32 status;
	305	__be32 *p;
	306
	307	p = xdr_inline_decode(xdr, sizeof(status));
	308	if (unlikely(p == NULL))
	309	return -EIO;
	310	status = ntohl(*p);
	311
	312	for (i = 0; i <= ARRAY_SIZE(mnt3_errtbl); i++) {
	313	if (mnt3_errtbl[i].status == status) {
	314	res->errno = mnt3_errtbl[i].errno;
	315	return 0;
	316	}
	317	}
	318
	319	dprintk("NFS: unrecognized MNT3 status code: %u\n", status);
	320	res->errno = -EACCES;
	321	return 0;
	322	}
	323
4fdcd996 CL	324	static int decode_fhandle3(struct xdr_stream xdr, struct mountres res)
	325	{
	326	struct nfs_fh *fh = res->fh;
	327	u32 size;
	328	__be32 *p;
	329
	330	p = xdr_inline_decode(xdr, sizeof(size));
	331	if (unlikely(p == NULL))
	332	return -EIO;
	333
	334	size = ntohl(*p++);
	335	if (size > NFS3_FHSIZE \|\| size == 0)
	336	return -EIO;
	337
	338	p = xdr_inline_decode(xdr, size);
	339	if (unlikely(p == NULL))
	340	return -EIO;
	341
	342	fh->size = size;
	343	memcpy(fh->data, p, size);
	344	return 0;
	345	}
	346
a14017db CL	347	static int decode_auth_flavors(struct xdr_stream xdr, struct mountres res)
	348	{
	349	rpc_authflavor_t *flavors = res->auth_flavors;
	350	unsigned int *count = res->auth_count;
	351	u32 entries, i;
	352	__be32 *p;
	353
	354	if (*count == 0)
	355	return 0;
	356
	357	p = xdr_inline_decode(xdr, sizeof(entries));
	358	if (unlikely(p == NULL))
	359	return -EIO;
	360	entries = ntohl(*p);
	361	dprintk("NFS: received %u auth flavors\n", entries);
	362	if (entries > NFS_MAX_SECFLAVORS)
	363	entries = NFS_MAX_SECFLAVORS;
	364
	365	p = xdr_inline_decode(xdr, sizeof(u32) * entries);
	366	if (unlikely(p == NULL))
	367	return -EIO;
	368
	369	if (entries > *count)
	370	entries = *count;
	371
	372	for (i = 0; i < entries; i++) {
	373	flavors[i] = ntohl(*p++);
	374	dprintk("NFS:\tflavor %u: %d\n", i, flavors[i]);
	375	}
	376	*count = i;
	377
	378	return 0;
	379	}
	380
8e02f6b9 CL	381	static int mnt_dec_mountres3(struct rpc_rqst req, __be32 p,
	382	struct mountres *res)
	383	{
	384	struct xdr_stream xdr;
	385	int status;
	386
	387	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	388
	389	status = decode_fhs_status(&xdr, res);
	390	if (unlikely(status != 0 \|\| res->errno != 0))
	391	return status;
	392	status = decode_fhandle3(&xdr, res);
	393	if (unlikely(status != 0)) {
	394	res->errno = -EBADHANDLE;
	395	return 0;
	396	}
	397	return decode_auth_flavors(&xdr, res);
	398	}
	399
19207231	400	static struct rpc_procinfo mnt_procedures[] = {
2ad78097 CL	401	[MOUNTPROC_MNT] = {
2ad78097 CL	402	.p_proc = MOUNTPROC_MNT,
29a1bd6b	403	.p_encode = (kxdrproc_t)mnt_enc_dirpath,
8e02f6b9	404	.p_decode = (kxdrproc_t)mnt_dec_mountres,
29a1bd6b	405	.p_arglen = MNT_enc_dirpath_sz,
8e02f6b9	406	.p_replen = MNT_dec_mountres_sz,
2ad78097	407	.p_statidx = MOUNTPROC_MNT,
19207231	408	.p_name = "MOUNT",
1da177e4 LT	409	},
	410	};
	411
	412	static struct rpc_procinfo mnt3_procedures[] = {
19207231 CL	413	[MOUNTPROC3_MNT] = {
19207231 CL	414	.p_proc = MOUNTPROC3_MNT,
29a1bd6b	415	.p_encode = (kxdrproc_t)mnt_enc_dirpath,
8e02f6b9	416	.p_decode = (kxdrproc_t)mnt_dec_mountres3,
29a1bd6b	417	.p_arglen = MNT_enc_dirpath_sz,
8e02f6b9	418	.p_replen = MNT_dec_mountres3_sz,
19207231 CL	419	.p_statidx = MOUNTPROC3_MNT,
19207231 CL	420	.p_name = "MOUNT",
1da177e4 LT	421	},
	422	};
	423
	424
19207231 CL	425	static struct rpc_version mnt_version1 = {
	426	.number = 1,
	427	.nrprocs = 2,
	428	.procs = mnt_procedures,
1da177e4 LT	429	};
1da177e4 LT	430
19207231 CL	431	static struct rpc_version mnt_version3 = {
	432	.number = 3,
	433	.nrprocs = 2,
	434	.procs = mnt3_procedures,
1da177e4 LT	435	};
1da177e4 LT	436
19207231	437	static struct rpc_version *mnt_version[] = {
1da177e4 LT	438	NULL,
	439	&mnt_version1,
	440	NULL,
	441	&mnt_version3,
	442	};
	443
19207231	444	static struct rpc_stat mnt_stats;
1da177e4	445
19207231	446	static struct rpc_program mnt_program = {
1da177e4 LT	447	.name = "mount",
1da177e4 LT	448	.number = NFS_MNT_PROGRAM,
e8c96f8c	449	.nrvers = ARRAY_SIZE(mnt_version),
1da177e4 LT	450	.version = mnt_version,
	451	.stats = &mnt_stats,
	452	};