[deliverable/linux.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

/*
 * 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 mnt_fhstatus	result = {
		.fh		= info->fh
	};
	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.status != 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 RPC client, status=%d\n", status);
	goto out;

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

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

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;
}

/*
 * 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 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 xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p,
				struct mnt_fhstatus *res)
{
	struct nfs_fh *fh = res->fh;
	unsigned size;

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

#define MNT_fhstatus_sz		(1 + 8)
#define MNT_fhstatus3_sz	(1 + 16)

static struct rpc_procinfo mnt_procedures[] = {
	[MOUNTPROC_MNT] = {
		.p_proc		= MOUNTPROC_MNT,
		.p_encode	= (kxdrproc_t)mnt_enc_dirpath,
		.p_decode	= (kxdrproc_t) xdr_decode_fhstatus,
		.p_arglen	= MNT_enc_dirpath_sz,
		.p_replen	= MNT_fhstatus_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) xdr_decode_fhstatus3,
		.p_arglen	= MNT_enc_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	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
	42
2ad78097 CL	43	/*
	44	* Defined by RFC 1094, section A.5
	45	*/
	46	enum {
	47	MOUNTPROC_NULL = 0,
	48	MOUNTPROC_MNT = 1,
	49	MOUNTPROC_DUMP = 2,
	50	MOUNTPROC_UMNT = 3,
	51	MOUNTPROC_UMNTALL = 4,
	52	MOUNTPROC_EXPORT = 5,
	53	};
	54
	55	/*
	56	* Defined by RFC 1813, section 5.2
	57	*/
	58	enum {
	59	MOUNTPROC3_NULL = 0,
	60	MOUNTPROC3_MNT = 1,
	61	MOUNTPROC3_DUMP = 2,
	62	MOUNTPROC3_UMNT = 3,
	63	MOUNTPROC3_UMNTALL = 4,
	64	MOUNTPROC3_EXPORT = 5,
	65	};
	66
1da177e4 LT	67	static struct rpc_program mnt_program;
1da177e4 LT	68
fb125295 CL	69	/*
	70	* Defined by OpenGroup XNFS Version 3W, chapter 8
	71	*/
	72	enum mountstat {
	73	MNT_OK = 0,
	74	MNT_EPERM = 1,
	75	MNT_ENOENT = 2,
	76	MNT_EACCES = 13,
	77	MNT_EINVAL = 22,
	78	};
	79
	80	static struct {
	81	u32 status;
	82	int errno;
	83	} mnt_errtbl[] = {
	84	{ .status = MNT_OK, .errno = 0, },
	85	{ .status = MNT_EPERM, .errno = -EPERM, },
	86	{ .status = MNT_ENOENT, .errno = -ENOENT, },
	87	{ .status = MNT_EACCES, .errno = -EACCES, },
	88	{ .status = MNT_EINVAL, .errno = -EINVAL, },
	89	};
	90
	91	/*
	92	* Defined by RFC 1813, section 5.1.5
	93	*/
	94	enum mountstat3 {
	95	MNT3_OK = 0, /* no error */
	96	MNT3ERR_PERM = 1, /* Not owner */
	97	MNT3ERR_NOENT = 2, /* No such file or directory */
	98	MNT3ERR_IO = 5, /* I/O error */
	99	MNT3ERR_ACCES = 13, /* Permission denied */
	100	MNT3ERR_NOTDIR = 20, /* Not a directory */
	101	MNT3ERR_INVAL = 22, /* Invalid argument */
	102	MNT3ERR_NAMETOOLONG = 63, /* Filename too long */
	103	MNT3ERR_NOTSUPP = 10004, /* Operation not supported */
	104	MNT3ERR_SERVERFAULT = 10006, /* A failure on the server */
	105	};
	106
	107	static struct {
	108	u32 status;
	109	int errno;
	110	} mnt3_errtbl[] = {
	111	{ .status = MNT3_OK, .errno = 0, },
	112	{ .status = MNT3ERR_PERM, .errno = -EPERM, },
	113	{ .status = MNT3ERR_NOENT, .errno = -ENOENT, },
	114	{ .status = MNT3ERR_IO, .errno = -EIO, },
	115	{ .status = MNT3ERR_ACCES, .errno = -EACCES, },
	116	{ .status = MNT3ERR_NOTDIR, .errno = -ENOTDIR, },
	117	{ .status = MNT3ERR_INVAL, .errno = -EINVAL, },
	118	{ .status = MNT3ERR_NAMETOOLONG, .errno = -ENAMETOOLONG, },
	119	{ .status = MNT3ERR_NOTSUPP, .errno = -ENOTSUPP, },
	120	{ .status = MNT3ERR_SERVERFAULT, .errno = -ESERVERFAULT, },
	121	};
	122
	123	struct mountres {
	124	int errno;
	125	struct nfs_fh *fh;
a14017db CL	126	unsigned int *auth_count;
a14017db CL	127	rpc_authflavor_t *auth_flavors;
fb125295 CL	128	};
fb125295 CL	129
1da177e4	130	struct mnt_fhstatus {
19207231 CL	131	u32 status;
19207231 CL	132	struct nfs_fh *fh;
1da177e4 LT	133	};
1da177e4 LT	134
3ea97309 CL	135	/**
3ea97309 CL	136	* nfs_mount - Obtain an NFS file handle for the given host and path
c5d120f8	137	* @info: pointer to mount request arguments
3ea97309 CL	138	*
3ea97309 CL	139	* Uses default timeout parameters specified by underlying transport.
1da177e4	140	*/
c5d120f8	141	int nfs_mount(struct nfs_mount_request *info)
1da177e4	142	{
1da177e4	143	struct mnt_fhstatus result = {
c5d120f8	144	.fh = info->fh
1da177e4	145	};
dead28da	146	struct rpc_message msg = {
c5d120f8	147	.rpc_argp = info->dirpath,
dead28da CL	148	.rpc_resp = &result,
dead28da CL	149	};
3ea97309	150	struct rpc_create_args args = {
c5d120f8 CL	151	.protocol = info->protocol,
	152	.address = info->sap,
	153	.addrsize = info->salen,
	154	.servername = info->hostname,
3ea97309	155	.program = &mnt_program,
c5d120f8	156	.version = info->version,
3ea97309	157	.authflavor = RPC_AUTH_UNIX,
3ea97309 CL	158	};
3ea97309 CL	159	struct rpc_clnt *mnt_clnt;
1da177e4	160	int status;
1da177e4	161
3ea97309	162	dprintk("NFS: sending MNT request for %s:%s\n",
c5d120f8 CL	163	(info->hostname ? info->hostname : "server"),
c5d120f8 CL	164	info->dirpath);
1da177e4	165
50a737f8 CL	166	if (info->noresvport)
	167	args.flags \|= RPC_CLNT_CREATE_NONPRIVPORT;
	168
3ea97309	169	mnt_clnt = rpc_create(&args);
1da177e4	170	if (IS_ERR(mnt_clnt))
013a8c1a	171	goto out_clnt_err;
1da177e4	172
c5d120f8	173	if (info->version == NFS_MNT3_VERSION)
dead28da CL	174	msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
dead28da CL	175	else
2ad78097	176	msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT];
dead28da CL	177
dead28da CL	178	status = rpc_call_sync(mnt_clnt, &msg, 0);
90c5755f	179	rpc_shutdown_client(mnt_clnt);
013a8c1a CL	180
	181	if (status < 0)
	182	goto out_call_err;
	183	if (result.status != 0)
	184	goto out_mnt_err;
	185
	186	dprintk("NFS: MNT request succeeded\n");
	187	status = 0;
	188
	189	out:
	190	return status;
	191
	192	out_clnt_err:
	193	status = PTR_ERR(mnt_clnt);
	194	dprintk("NFS: failed to create RPC client, status=%d\n", status);
	195	goto out;
	196
	197	out_call_err:
	198	dprintk("NFS: failed to start MNT request, status=%d\n", status);
	199	goto out;
	200
	201	out_mnt_err:
	202	dprintk("NFS: MNT server returned result %d\n", result.status);
8491945f	203	status = nfs_stat_to_errno(result.status);
013a8c1a	204	goto out;
1da177e4 LT	205	}
1da177e4 LT	206
1da177e4 LT	207	/*
	208	* XDR encode/decode functions for MOUNT
	209	*/
1da177e4	210
29a1bd6b CL	211	static int encode_mntdirpath(struct xdr_stream xdr, const char pathname)
	212	{
	213	const u32 pathname_len = strlen(pathname);
	214	__be32 *p;
	215
	216	if (unlikely(pathname_len > MNTPATHLEN))
	217	return -EIO;
	218
	219	p = xdr_reserve_space(xdr, sizeof(u32) + pathname_len);
	220	if (unlikely(p == NULL))
	221	return -EIO;
	222	xdr_encode_opaque(p, pathname, pathname_len);
	223
	224	return 0;
	225	}
	226
	227	static int mnt_enc_dirpath(struct rpc_rqst req, __be32 p,
	228	const char *dirpath)
	229	{
	230	struct xdr_stream xdr;
	231
	232	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	233	return encode_mntdirpath(&xdr, dirpath);
	234	}
	235
19207231 CL	236	static int xdr_decode_fhstatus(struct rpc_rqst req, __be32 p,
19207231 CL	237	struct mnt_fhstatus *res)
1da177e4 LT	238	{
	239	struct nfs_fh *fh = res->fh;
	240
	241	if ((res->status = ntohl(*p++)) == 0) {
	242	fh->size = NFS2_FHSIZE;
	243	memcpy(fh->data, p, NFS2_FHSIZE);
	244	}
	245	return 0;
	246	}
	247
fb125295 CL	248	/*
	249	* RFC 1094: "A non-zero status indicates some sort of error. In this
	250	* case, the status is a UNIX error number." This can be problematic
	251	* if the server and client use different errno values for the same
	252	* error.
	253	*
	254	* However, the OpenGroup XNFS spec provides a simple mapping that is
	255	* independent of local errno values on the server and the client.
	256	*/
	257	static int decode_status(struct xdr_stream xdr, struct mountres res)
	258	{
	259	unsigned int i;
	260	u32 status;
	261	__be32 *p;
	262
	263	p = xdr_inline_decode(xdr, sizeof(status));
	264	if (unlikely(p == NULL))
	265	return -EIO;
	266	status = ntohl(*p);
	267
	268	for (i = 0; i <= ARRAY_SIZE(mnt_errtbl); i++) {
	269	if (mnt_errtbl[i].status == status) {
	270	res->errno = mnt_errtbl[i].errno;
	271	return 0;
	272	}
	273	}
	274
	275	dprintk("NFS: unrecognized MNT status code: %u\n", status);
	276	res->errno = -EACCES;
	277	return 0;
	278	}
	279
4fdcd996 CL	280	static int decode_fhandle(struct xdr_stream xdr, struct mountres res)
	281	{
	282	struct nfs_fh *fh = res->fh;
	283	__be32 *p;
	284
	285	p = xdr_inline_decode(xdr, NFS2_FHSIZE);
	286	if (unlikely(p == NULL))
	287	return -EIO;
	288
	289	fh->size = NFS2_FHSIZE;
	290	memcpy(fh->data, p, NFS2_FHSIZE);
	291	return 0;
	292	}
	293
fb125295 CL	294	static int decode_fhs_status(struct xdr_stream xdr, struct mountres res)
	295	{
	296	unsigned int i;
	297	u32 status;
	298	__be32 *p;
	299
	300	p = xdr_inline_decode(xdr, sizeof(status));
	301	if (unlikely(p == NULL))
	302	return -EIO;
	303	status = ntohl(*p);
	304
	305	for (i = 0; i <= ARRAY_SIZE(mnt3_errtbl); i++) {
	306	if (mnt3_errtbl[i].status == status) {
	307	res->errno = mnt3_errtbl[i].errno;
	308	return 0;
	309	}
	310	}
	311
	312	dprintk("NFS: unrecognized MNT3 status code: %u\n", status);
	313	res->errno = -EACCES;
	314	return 0;
	315	}
	316
4fdcd996 CL	317	static int decode_fhandle3(struct xdr_stream xdr, struct mountres res)
	318	{
	319	struct nfs_fh *fh = res->fh;
	320	u32 size;
	321	__be32 *p;
	322
	323	p = xdr_inline_decode(xdr, sizeof(size));
	324	if (unlikely(p == NULL))
	325	return -EIO;
	326
	327	size = ntohl(*p++);
	328	if (size > NFS3_FHSIZE \|\| size == 0)
	329	return -EIO;
	330
	331	p = xdr_inline_decode(xdr, size);
	332	if (unlikely(p == NULL))
	333	return -EIO;
	334
	335	fh->size = size;
	336	memcpy(fh->data, p, size);
	337	return 0;
	338	}
	339
a14017db CL	340	static int decode_auth_flavors(struct xdr_stream xdr, struct mountres res)
	341	{
	342	rpc_authflavor_t *flavors = res->auth_flavors;
	343	unsigned int *count = res->auth_count;
	344	u32 entries, i;
	345	__be32 *p;
	346
	347	if (*count == 0)
	348	return 0;
	349
	350	p = xdr_inline_decode(xdr, sizeof(entries));
	351	if (unlikely(p == NULL))
	352	return -EIO;
	353	entries = ntohl(*p);
	354	dprintk("NFS: received %u auth flavors\n", entries);
	355	if (entries > NFS_MAX_SECFLAVORS)
	356	entries = NFS_MAX_SECFLAVORS;
	357
	358	p = xdr_inline_decode(xdr, sizeof(u32) * entries);
	359	if (unlikely(p == NULL))
	360	return -EIO;
	361
	362	if (entries > *count)
	363	entries = *count;
	364
	365	for (i = 0; i < entries; i++) {
	366	flavors[i] = ntohl(*p++);
	367	dprintk("NFS:\tflavor %u: %d\n", i, flavors[i]);
	368	}
	369	*count = i;
	370
	371	return 0;
	372	}
	373
19207231 CL	374	static int xdr_decode_fhstatus3(struct rpc_rqst req, __be32 p,
19207231 CL	375	struct mnt_fhstatus *res)
1da177e4 LT	376	{
1da177e4 LT	377	struct nfs_fh *fh = res->fh;
b7e24457	378	unsigned size;
1da177e4 LT	379
1da177e4 LT	380	if ((res->status = ntohl(*p++)) == 0) {
b7e24457 TM	381	size = ntohl(*p++);
b7e24457 TM	382	if (size <= NFS3_FHSIZE && size != 0) {
1da177e4 LT	383	fh->size = size;
	384	memcpy(fh->data, p, size);
	385	} else
	386	res->status = -EBADHANDLE;
	387	}
	388	return 0;
	389	}
	390
1da177e4	391	#define MNT_fhstatus_sz (1 + 8)
2bea90d4	392	#define MNT_fhstatus3_sz (1 + 16)
1da177e4	393
19207231	394	static struct rpc_procinfo mnt_procedures[] = {
2ad78097 CL	395	[MOUNTPROC_MNT] = {
2ad78097 CL	396	.p_proc = MOUNTPROC_MNT,
29a1bd6b	397	.p_encode = (kxdrproc_t)mnt_enc_dirpath,
19207231	398	.p_decode = (kxdrproc_t) xdr_decode_fhstatus,
29a1bd6b	399	.p_arglen = MNT_enc_dirpath_sz,
19207231	400	.p_replen = MNT_fhstatus_sz,
2ad78097	401	.p_statidx = MOUNTPROC_MNT,
19207231	402	.p_name = "MOUNT",
1da177e4 LT	403	},
	404	};
	405
	406	static struct rpc_procinfo mnt3_procedures[] = {
19207231 CL	407	[MOUNTPROC3_MNT] = {
19207231 CL	408	.p_proc = MOUNTPROC3_MNT,
29a1bd6b	409	.p_encode = (kxdrproc_t)mnt_enc_dirpath,
19207231	410	.p_decode = (kxdrproc_t) xdr_decode_fhstatus3,
29a1bd6b	411	.p_arglen = MNT_enc_dirpath_sz,
19207231 CL	412	.p_replen = MNT_fhstatus3_sz,
	413	.p_statidx = MOUNTPROC3_MNT,
	414	.p_name = "MOUNT",
1da177e4 LT	415	},
	416	};
	417
	418
19207231 CL	419	static struct rpc_version mnt_version1 = {
	420	.number = 1,
	421	.nrprocs = 2,
	422	.procs = mnt_procedures,
1da177e4 LT	423	};
1da177e4 LT	424
19207231 CL	425	static struct rpc_version mnt_version3 = {
	426	.number = 3,
	427	.nrprocs = 2,
	428	.procs = mnt3_procedures,
1da177e4 LT	429	};
1da177e4 LT	430
19207231	431	static struct rpc_version *mnt_version[] = {
1da177e4 LT	432	NULL,
	433	&mnt_version1,
	434	NULL,
	435	&mnt_version3,
	436	};
	437
19207231	438	static struct rpc_stat mnt_stats;
1da177e4	439
19207231	440	static struct rpc_program mnt_program = {
1da177e4 LT	441	.name = "mount",
1da177e4 LT	442	.number = NFS_MNT_PROGRAM,
e8c96f8c	443	.nrvers = ARRAY_SIZE(mnt_version),
1da177e4 LT	444	.version = mnt_version,
	445	.stats = &mnt_stats,
	446	};