[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 NFS_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 const 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 = -EREMOTEIO,	},
};

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 = {
		.net		= info->net,
		.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 (strlen(info->dirpath) > MNTPATHLEN)
		return -ENAMETOOLONG;

	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, RPC_TASK_SOFT|RPC_TASK_TIMEOUT);
	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;
}

/**
 * nfs_umount - Notify a server that we have unmounted this export
 * @info: pointer to umount request arguments
 *
 * MOUNTPROC_UMNT is advisory, so we set a short timeout, and always
 * use UDP.
 */
void nfs_umount(const struct nfs_mount_request *info)
{
	static const struct rpc_timeout nfs_umnt_timeout = {
		.to_initval = 1 * HZ,
		.to_maxval = 3 * HZ,
		.to_retries = 2,
	};
	struct rpc_create_args args = {
		.net		= info->net,
		.protocol	= IPPROTO_UDP,
		.address	= info->sap,
		.addrsize	= info->salen,
		.timeout	= &nfs_umnt_timeout,
		.servername	= info->hostname,
		.program	= &mnt_program,
		.version	= info->version,
		.authflavor	= RPC_AUTH_UNIX,
		.flags		= RPC_CLNT_CREATE_NOPING,
	};
	struct rpc_message msg	= {
		.rpc_argp	= info->dirpath,
	};
	struct rpc_clnt *clnt;
	int status;

	if (strlen(info->dirpath) > MNTPATHLEN)
		return;

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

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

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

	if (info->version == NFS_MNT3_VERSION)
		msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC3_UMNT];
	else
		msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC_UMNT];

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

	if (unlikely(status < 0))
		goto out_call_err;

	return;

out_clnt_err:
	dprintk("NFS: failed to create UMNT RPC client, status=%ld\n",
			PTR_ERR(clnt));
	return;

out_call_err:
	dprintk("NFS: UMNT request failed, status=%d\n", status);
}

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

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

	p = xdr_reserve_space(xdr, 4 + pathname_len);
	xdr_encode_opaque(p, pathname, pathname_len);
}

static void mnt_xdr_enc_dirpath(struct rpc_rqst *req, struct xdr_stream *xdr,
				const char *dirpath)
{
	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, 4);
	if (unlikely(p == NULL))
		return -EIO;
	status = be32_to_cpup(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_xdr_dec_mountres(struct rpc_rqst *req,
				struct xdr_stream *xdr,
				struct mountres *res)
{
	int status;

	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, 4);
	if (unlikely(p == NULL))
		return -EIO;
	status = be32_to_cpup(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, 4);
	if (unlikely(p == NULL))
		return -EIO;

	size = be32_to_cpup(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, 4);
	if (unlikely(p == NULL))
		return -EIO;
	entries = be32_to_cpup(p);
	dprintk("NFS: received %u auth flavors\n", entries);
	if (entries > NFS_MAX_SECFLAVORS)
		entries = NFS_MAX_SECFLAVORS;

	p = xdr_inline_decode(xdr, 4 * entries);
	if (unlikely(p == NULL))
		return -EIO;

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

	for (i = 0; i < entries; i++) {
		flavors[i] = be32_to_cpup(p++);
		dprintk("NFS:   auth flavor[%u]: %d\n", i, flavors[i]);
	}
	*count = i;

	return 0;
}

static int mnt_xdr_dec_mountres3(struct rpc_rqst *req,
				 struct xdr_stream *xdr,
				 struct mountres *res)
{
	int status;

	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	= (kxdreproc_t)mnt_xdr_enc_dirpath,
		.p_decode	= (kxdrdproc_t)mnt_xdr_dec_mountres,
		.p_arglen	= MNT_enc_dirpath_sz,
		.p_replen	= MNT_dec_mountres_sz,
		.p_statidx	= MOUNTPROC_MNT,
		.p_name		= "MOUNT",
	},
	[MOUNTPROC_UMNT] = {
		.p_proc		= MOUNTPROC_UMNT,
		.p_encode	= (kxdreproc_t)mnt_xdr_enc_dirpath,
		.p_arglen	= MNT_enc_dirpath_sz,
		.p_statidx	= MOUNTPROC_UMNT,
		.p_name		= "UMOUNT",
	},
};

static struct rpc_procinfo mnt3_procedures[] = {
	[MOUNTPROC3_MNT] = {
		.p_proc		= MOUNTPROC3_MNT,
		.p_encode	= (kxdreproc_t)mnt_xdr_enc_dirpath,
		.p_decode	= (kxdrdproc_t)mnt_xdr_dec_mountres3,
		.p_arglen	= MNT_enc_dirpath_sz,
		.p_replen	= MNT_dec_mountres3_sz,
		.p_statidx	= MOUNTPROC3_MNT,
		.p_name		= "MOUNT",
	},
	[MOUNTPROC3_UMNT] = {
		.p_proc		= MOUNTPROC3_UMNT,
		.p_encode	= (kxdreproc_t)mnt_xdr_enc_dirpath,
		.p_arglen	= MNT_enc_dirpath_sz,
		.p_statidx	= MOUNTPROC3_UMNT,
		.p_name		= "UMOUNT",
	},
};


static const struct rpc_version mnt_version1 = {
	.number		= 1,
	.nrprocs	= ARRAY_SIZE(mnt_procedures),
	.procs		= mnt_procedures,
};

static const struct rpc_version mnt_version3 = {
	.number		= 3,
	.nrprocs	= ARRAY_SIZE(mnt3_procedures),
	.procs		= mnt3_procedures,
};

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

static struct rpc_stat mnt_stats;

static const 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	18
e27d359e	19	#ifdef NFS_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
a613fa16	70	static const struct rpc_program mnt_program;
1da177e4	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, },
fdcb4577	123	{ .status = MNT3ERR_SERVERFAULT, .errno = -EREMOTEIO, },
fb125295 CL	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 = {
6d59b8d5	156	.net = info->net,
c5d120f8 CL	157	.protocol = info->protocol,
	158	.address = info->sap,
	159	.addrsize = info->salen,
	160	.servername = info->hostname,
3ea97309	161	.program = &mnt_program,
c5d120f8	162	.version = info->version,
3ea97309	163	.authflavor = RPC_AUTH_UNIX,
3ea97309 CL	164	};
3ea97309 CL	165	struct rpc_clnt *mnt_clnt;
1da177e4	166	int status;
1da177e4	167
3ea97309	168	dprintk("NFS: sending MNT request for %s:%s\n",
c5d120f8 CL	169	(info->hostname ? info->hostname : "server"),
c5d120f8 CL	170	info->dirpath);
1da177e4	171
28d79ea3 TM	172	if (strlen(info->dirpath) > MNTPATHLEN)
	173	return -ENAMETOOLONG;
	174
50a737f8 CL	175	if (info->noresvport)
	176	args.flags \|= RPC_CLNT_CREATE_NONPRIVPORT;
	177
3ea97309	178	mnt_clnt = rpc_create(&args);
1da177e4	179	if (IS_ERR(mnt_clnt))
013a8c1a	180	goto out_clnt_err;
1da177e4	181
c5d120f8	182	if (info->version == NFS_MNT3_VERSION)
dead28da CL	183	msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
dead28da CL	184	else
2ad78097	185	msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT];
dead28da	186
acce94e6	187	status = rpc_call_sync(mnt_clnt, &msg, RPC_TASK_SOFT\|RPC_TASK_TIMEOUT);
90c5755f	188	rpc_shutdown_client(mnt_clnt);
013a8c1a CL	189
	190	if (status < 0)
	191	goto out_call_err;
8e02f6b9	192	if (result.errno != 0)
013a8c1a CL	193	goto out_mnt_err;
	194
	195	dprintk("NFS: MNT request succeeded\n");
	196	status = 0;
	197
	198	out:
	199	return status;
	200
	201	out_clnt_err:
	202	status = PTR_ERR(mnt_clnt);
8e02f6b9	203	dprintk("NFS: failed to create MNT RPC client, status=%d\n", status);
013a8c1a CL	204	goto out;
	205
	206	out_call_err:
8e02f6b9	207	dprintk("NFS: MNT request failed, status=%d\n", status);
013a8c1a CL	208	goto out;
	209
	210	out_mnt_err:
8e02f6b9 CL	211	dprintk("NFS: MNT server returned result %d\n", result.errno);
8e02f6b9 CL	212	status = result.errno;
013a8c1a	213	goto out;
1da177e4 LT	214	}
1da177e4 LT	215
0b524123 CL	216	/**
	217	* nfs_umount - Notify a server that we have unmounted this export
	218	* @info: pointer to umount request arguments
	219	*
	220	* MOUNTPROC_UMNT is advisory, so we set a short timeout, and always
	221	* use UDP.
	222	*/
	223	void nfs_umount(const struct nfs_mount_request *info)
	224	{
	225	static const struct rpc_timeout nfs_umnt_timeout = {
	226	.to_initval = 1 * HZ,
	227	.to_maxval = 3 * HZ,
	228	.to_retries = 2,
	229	};
	230	struct rpc_create_args args = {
6d59b8d5	231	.net = info->net,
0b524123 CL	232	.protocol = IPPROTO_UDP,
	233	.address = info->sap,
	234	.addrsize = info->salen,
	235	.timeout = &nfs_umnt_timeout,
	236	.servername = info->hostname,
	237	.program = &mnt_program,
	238	.version = info->version,
	239	.authflavor = RPC_AUTH_UNIX,
	240	.flags = RPC_CLNT_CREATE_NOPING,
	241	};
0b524123 CL	242	struct rpc_message msg = {
0b524123 CL	243	.rpc_argp = info->dirpath,
0b524123 CL	244	};
	245	struct rpc_clnt *clnt;
	246	int status;
	247
28d79ea3 TM	248	if (strlen(info->dirpath) > MNTPATHLEN)
	249	return;
	250
0b524123 CL	251	if (info->noresvport)
	252	args.flags \|= RPC_CLNT_CREATE_NONPRIVPORT;
	253
	254	clnt = rpc_create(&args);
c8b031eb	255	if (IS_ERR(clnt))
0b524123 CL	256	goto out_clnt_err;
	257
	258	dprintk("NFS: sending UMNT request for %s:%s\n",
	259	(info->hostname ? info->hostname : "server"), info->dirpath);
	260
	261	if (info->version == NFS_MNT3_VERSION)
	262	msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC3_UMNT];
	263	else
	264	msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC_UMNT];
	265
	266	status = rpc_call_sync(clnt, &msg, 0);
	267	rpc_shutdown_client(clnt);
	268
	269	if (unlikely(status < 0))
	270	goto out_call_err;
	271
	272	return;
	273
	274	out_clnt_err:
	275	dprintk("NFS: failed to create UMNT RPC client, status=%ld\n",
	276	PTR_ERR(clnt));
	277	return;
	278
	279	out_call_err:
	280	dprintk("NFS: UMNT request failed, status=%d\n", status);
	281	}
	282
1da177e4 LT	283	/*
	284	* XDR encode/decode functions for MOUNT
	285	*/
1da177e4	286
98eb2b4f	287	static void encode_mntdirpath(struct xdr_stream xdr, const char pathname)
29a1bd6b CL	288	{
	289	const u32 pathname_len = strlen(pathname);
	290	__be32 *p;
	291
98eb2b4f	292	p = xdr_reserve_space(xdr, 4 + pathname_len);
29a1bd6b	293	xdr_encode_opaque(p, pathname, pathname_len);
29a1bd6b CL	294	}
29a1bd6b CL	295
9f06c719 CL	296	static void mnt_xdr_enc_dirpath(struct rpc_rqst req, struct xdr_stream xdr,
9f06c719 CL	297	const char *dirpath)
29a1bd6b	298	{
9f06c719	299	encode_mntdirpath(xdr, dirpath);
29a1bd6b CL	300	}
29a1bd6b CL	301
fb125295 CL	302	/*
	303	* RFC 1094: "A non-zero status indicates some sort of error. In this
	304	* case, the status is a UNIX error number." This can be problematic
	305	* if the server and client use different errno values for the same
	306	* error.
	307	*
	308	* However, the OpenGroup XNFS spec provides a simple mapping that is
	309	* independent of local errno values on the server and the client.
	310	*/
	311	static int decode_status(struct xdr_stream xdr, struct mountres res)
	312	{
	313	unsigned int i;
	314	u32 status;
	315	__be32 *p;
	316
98eb2b4f	317	p = xdr_inline_decode(xdr, 4);
fb125295 CL	318	if (unlikely(p == NULL))
fb125295 CL	319	return -EIO;
98eb2b4f	320	status = be32_to_cpup(p);
fb125295	321
dd8ac1da	322	for (i = 0; i < ARRAY_SIZE(mnt_errtbl); i++) {
fb125295 CL	323	if (mnt_errtbl[i].status == status) {
	324	res->errno = mnt_errtbl[i].errno;
	325	return 0;
	326	}
	327	}
	328
	329	dprintk("NFS: unrecognized MNT status code: %u\n", status);
	330	res->errno = -EACCES;
	331	return 0;
	332	}
	333
4fdcd996 CL	334	static int decode_fhandle(struct xdr_stream xdr, struct mountres res)
	335	{
	336	struct nfs_fh *fh = res->fh;
	337	__be32 *p;
	338
	339	p = xdr_inline_decode(xdr, NFS2_FHSIZE);
	340	if (unlikely(p == NULL))
	341	return -EIO;
	342
	343	fh->size = NFS2_FHSIZE;
	344	memcpy(fh->data, p, NFS2_FHSIZE);
	345	return 0;
	346	}
	347
bf269551 CL	348	static int mnt_xdr_dec_mountres(struct rpc_rqst *req,
	349	struct xdr_stream *xdr,
	350	struct mountres *res)
8e02f6b9	351	{
8e02f6b9 CL	352	int status;
8e02f6b9 CL	353
bf269551	354	status = decode_status(xdr, res);
8e02f6b9 CL	355	if (unlikely(status != 0 \|\| res->errno != 0))
8e02f6b9 CL	356	return status;
bf269551	357	return decode_fhandle(xdr, res);
8e02f6b9 CL	358	}
8e02f6b9 CL	359
fb125295 CL	360	static int decode_fhs_status(struct xdr_stream xdr, struct mountres res)
	361	{
	362	unsigned int i;
	363	u32 status;
	364	__be32 *p;
	365
98eb2b4f	366	p = xdr_inline_decode(xdr, 4);
fb125295 CL	367	if (unlikely(p == NULL))
fb125295 CL	368	return -EIO;
98eb2b4f	369	status = be32_to_cpup(p);
fb125295	370
dd8ac1da	371	for (i = 0; i < ARRAY_SIZE(mnt3_errtbl); i++) {
fb125295 CL	372	if (mnt3_errtbl[i].status == status) {
	373	res->errno = mnt3_errtbl[i].errno;
	374	return 0;
	375	}
	376	}
	377
	378	dprintk("NFS: unrecognized MNT3 status code: %u\n", status);
	379	res->errno = -EACCES;
	380	return 0;
	381	}
	382
4fdcd996 CL	383	static int decode_fhandle3(struct xdr_stream xdr, struct mountres res)
	384	{
	385	struct nfs_fh *fh = res->fh;
	386	u32 size;
	387	__be32 *p;
	388
98eb2b4f	389	p = xdr_inline_decode(xdr, 4);
4fdcd996 CL	390	if (unlikely(p == NULL))
	391	return -EIO;
	392
98eb2b4f	393	size = be32_to_cpup(p);
4fdcd996 CL	394	if (size > NFS3_FHSIZE \|\| size == 0)
	395	return -EIO;
	396
	397	p = xdr_inline_decode(xdr, size);
	398	if (unlikely(p == NULL))
	399	return -EIO;
	400
	401	fh->size = size;
	402	memcpy(fh->data, p, size);
	403	return 0;
	404	}
	405
a14017db CL	406	static int decode_auth_flavors(struct xdr_stream xdr, struct mountres res)
	407	{
	408	rpc_authflavor_t *flavors = res->auth_flavors;
	409	unsigned int *count = res->auth_count;
	410	u32 entries, i;
	411	__be32 *p;
	412
	413	if (*count == 0)
	414	return 0;
	415
98eb2b4f	416	p = xdr_inline_decode(xdr, 4);
a14017db CL	417	if (unlikely(p == NULL))
a14017db CL	418	return -EIO;
98eb2b4f	419	entries = be32_to_cpup(p);
a14017db CL	420	dprintk("NFS: received %u auth flavors\n", entries);
	421	if (entries > NFS_MAX_SECFLAVORS)
	422	entries = NFS_MAX_SECFLAVORS;
	423
98eb2b4f	424	p = xdr_inline_decode(xdr, 4 * entries);
a14017db CL	425	if (unlikely(p == NULL))
	426	return -EIO;
	427
	428	if (entries > *count)
	429	entries = *count;
	430
	431	for (i = 0; i < entries; i++) {
98eb2b4f	432	flavors[i] = be32_to_cpup(p++);
ed58b291	433	dprintk("NFS: auth flavor[%u]: %d\n", i, flavors[i]);
a14017db CL	434	}
	435	*count = i;
	436
	437	return 0;
	438	}
	439
bf269551 CL	440	static int mnt_xdr_dec_mountres3(struct rpc_rqst *req,
	441	struct xdr_stream *xdr,
	442	struct mountres *res)
8e02f6b9	443	{
8e02f6b9 CL	444	int status;
8e02f6b9 CL	445
bf269551	446	status = decode_fhs_status(xdr, res);
8e02f6b9 CL	447	if (unlikely(status != 0 \|\| res->errno != 0))
8e02f6b9 CL	448	return status;
bf269551	449	status = decode_fhandle3(xdr, res);
8e02f6b9 CL	450	if (unlikely(status != 0)) {
	451	res->errno = -EBADHANDLE;
	452	return 0;
	453	}
bf269551	454	return decode_auth_flavors(xdr, res);
8e02f6b9 CL	455	}
8e02f6b9 CL	456
19207231	457	static struct rpc_procinfo mnt_procedures[] = {
2ad78097 CL	458	[MOUNTPROC_MNT] = {
2ad78097 CL	459	.p_proc = MOUNTPROC_MNT,
9f06c719	460	.p_encode = (kxdreproc_t)mnt_xdr_enc_dirpath,
bf269551	461	.p_decode = (kxdrdproc_t)mnt_xdr_dec_mountres,
29a1bd6b	462	.p_arglen = MNT_enc_dirpath_sz,
8e02f6b9	463	.p_replen = MNT_dec_mountres_sz,
2ad78097	464	.p_statidx = MOUNTPROC_MNT,
19207231	465	.p_name = "MOUNT",
1da177e4	466	},
0b524123 CL	467	[MOUNTPROC_UMNT] = {
0b524123 CL	468	.p_proc = MOUNTPROC_UMNT,
9f06c719	469	.p_encode = (kxdreproc_t)mnt_xdr_enc_dirpath,
0b524123 CL	470	.p_arglen = MNT_enc_dirpath_sz,
	471	.p_statidx = MOUNTPROC_UMNT,
	472	.p_name = "UMOUNT",
	473	},
1da177e4 LT	474	};
	475
	476	static struct rpc_procinfo mnt3_procedures[] = {
19207231 CL	477	[MOUNTPROC3_MNT] = {
19207231 CL	478	.p_proc = MOUNTPROC3_MNT,
9f06c719	479	.p_encode = (kxdreproc_t)mnt_xdr_enc_dirpath,
bf269551	480	.p_decode = (kxdrdproc_t)mnt_xdr_dec_mountres3,
29a1bd6b	481	.p_arglen = MNT_enc_dirpath_sz,
8e02f6b9	482	.p_replen = MNT_dec_mountres3_sz,
19207231 CL	483	.p_statidx = MOUNTPROC3_MNT,
19207231 CL	484	.p_name = "MOUNT",
1da177e4	485	},
0b524123 CL	486	[MOUNTPROC3_UMNT] = {
0b524123 CL	487	.p_proc = MOUNTPROC3_UMNT,
9f06c719	488	.p_encode = (kxdreproc_t)mnt_xdr_enc_dirpath,
0b524123 CL	489	.p_arglen = MNT_enc_dirpath_sz,
	490	.p_statidx = MOUNTPROC3_UMNT,
	491	.p_name = "UMOUNT",
	492	},
1da177e4 LT	493	};
	494
	495
a613fa16	496	static const struct rpc_version mnt_version1 = {
19207231	497	.number = 1,
5b362ac3	498	.nrprocs = ARRAY_SIZE(mnt_procedures),
19207231	499	.procs = mnt_procedures,
1da177e4 LT	500	};
1da177e4 LT	501
a613fa16	502	static const struct rpc_version mnt_version3 = {
19207231	503	.number = 3,
5b362ac3	504	.nrprocs = ARRAY_SIZE(mnt3_procedures),
19207231	505	.procs = mnt3_procedures,
1da177e4 LT	506	};
1da177e4 LT	507
a613fa16	508	static const struct rpc_version *mnt_version[] = {
1da177e4 LT	509	NULL,
	510	&mnt_version1,
	511	NULL,
	512	&mnt_version3,
	513	};
	514
19207231	515	static struct rpc_stat mnt_stats;
1da177e4	516
a613fa16	517	static const struct rpc_program mnt_program = {
1da177e4 LT	518	.name = "mount",
1da177e4 LT	519	.number = NFS_MNT_PROGRAM,
e8c96f8c	520	.nrvers = ARRAY_SIZE(mnt_version),
1da177e4 LT	521	.version = mnt_version,
	522	.stats = &mnt_stats,
	523	};