[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 = -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		= &init_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 (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;
}

/**
 * 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		= &init_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 (info->noresvport)
		args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;

	clnt = rpc_create(&args);
	if (unlikely(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;

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

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);
	encode_mntdirpath(&xdr, dirpath);
	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, 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_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, 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_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",
	},
	[MOUNTPROC_UMNT] = {
		.p_proc		= MOUNTPROC_UMNT,
		.p_encode	= (kxdrproc_t)mnt_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	= (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",
	},
	[MOUNTPROC3_UMNT] = {
		.p_proc		= MOUNTPROC3_UMNT,
		.p_encode	= (kxdrproc_t)mnt_enc_dirpath,
		.p_arglen	= MNT_enc_dirpath_sz,
		.p_statidx	= MOUNTPROC3_UMNT,
		.p_name		= "UMOUNT",
	},
};


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

static struct rpc_version mnt_version3 = {
	.number		= 3,
	.nrprocs	= ARRAY_SIZE(mnt3_procedures),
	.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, },
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 = {
c653ce3f	156	.net = &init_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
50a737f8 CL	172	if (info->noresvport)
	173	args.flags \|= RPC_CLNT_CREATE_NONPRIVPORT;
	174
3ea97309	175	mnt_clnt = rpc_create(&args);
1da177e4	176	if (IS_ERR(mnt_clnt))
013a8c1a	177	goto out_clnt_err;
1da177e4	178
c5d120f8	179	if (info->version == NFS_MNT3_VERSION)
dead28da CL	180	msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
dead28da CL	181	else
2ad78097	182	msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT];
dead28da CL	183
dead28da CL	184	status = rpc_call_sync(mnt_clnt, &msg, 0);
90c5755f	185	rpc_shutdown_client(mnt_clnt);
013a8c1a CL	186
	187	if (status < 0)
	188	goto out_call_err;
8e02f6b9	189	if (result.errno != 0)
013a8c1a CL	190	goto out_mnt_err;
	191
	192	dprintk("NFS: MNT request succeeded\n");
	193	status = 0;
	194
	195	out:
	196	return status;
	197
	198	out_clnt_err:
	199	status = PTR_ERR(mnt_clnt);
8e02f6b9	200	dprintk("NFS: failed to create MNT RPC client, status=%d\n", status);
013a8c1a CL	201	goto out;
	202
	203	out_call_err:
8e02f6b9	204	dprintk("NFS: MNT request failed, status=%d\n", status);
013a8c1a CL	205	goto out;
	206
	207	out_mnt_err:
8e02f6b9 CL	208	dprintk("NFS: MNT server returned result %d\n", result.errno);
8e02f6b9 CL	209	status = result.errno;
013a8c1a	210	goto out;
1da177e4 LT	211	}
1da177e4 LT	212
0b524123 CL	213	/**
	214	* nfs_umount - Notify a server that we have unmounted this export
	215	* @info: pointer to umount request arguments
	216	*
	217	* MOUNTPROC_UMNT is advisory, so we set a short timeout, and always
	218	* use UDP.
	219	*/
	220	void nfs_umount(const struct nfs_mount_request *info)
	221	{
	222	static const struct rpc_timeout nfs_umnt_timeout = {
	223	.to_initval = 1 * HZ,
	224	.to_maxval = 3 * HZ,
	225	.to_retries = 2,
	226	};
	227	struct rpc_create_args args = {
c653ce3f	228	.net = &init_net,
0b524123 CL	229	.protocol = IPPROTO_UDP,
	230	.address = info->sap,
	231	.addrsize = info->salen,
	232	.timeout = &nfs_umnt_timeout,
	233	.servername = info->hostname,
	234	.program = &mnt_program,
	235	.version = info->version,
	236	.authflavor = RPC_AUTH_UNIX,
	237	.flags = RPC_CLNT_CREATE_NOPING,
	238	};
0b524123 CL	239	struct rpc_message msg = {
0b524123 CL	240	.rpc_argp = info->dirpath,
0b524123 CL	241	};
	242	struct rpc_clnt *clnt;
	243	int status;
	244
	245	if (info->noresvport)
	246	args.flags \|= RPC_CLNT_CREATE_NONPRIVPORT;
	247
	248	clnt = rpc_create(&args);
	249	if (unlikely(IS_ERR(clnt)))
	250	goto out_clnt_err;
	251
	252	dprintk("NFS: sending UMNT request for %s:%s\n",
	253	(info->hostname ? info->hostname : "server"), info->dirpath);
	254
	255	if (info->version == NFS_MNT3_VERSION)
	256	msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC3_UMNT];
	257	else
	258	msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC_UMNT];
	259
	260	status = rpc_call_sync(clnt, &msg, 0);
	261	rpc_shutdown_client(clnt);
	262
	263	if (unlikely(status < 0))
	264	goto out_call_err;
	265
	266	return;
	267
	268	out_clnt_err:
	269	dprintk("NFS: failed to create UMNT RPC client, status=%ld\n",
	270	PTR_ERR(clnt));
	271	return;
	272
	273	out_call_err:
	274	dprintk("NFS: UMNT request failed, status=%d\n", status);
	275	}
	276
1da177e4 LT	277	/*
	278	* XDR encode/decode functions for MOUNT
	279	*/
1da177e4	280
98eb2b4f	281	static void encode_mntdirpath(struct xdr_stream xdr, const char pathname)
29a1bd6b CL	282	{
	283	const u32 pathname_len = strlen(pathname);
	284	__be32 *p;
	285
98eb2b4f CL	286	BUG_ON(pathname_len > MNTPATHLEN);
98eb2b4f CL	287	p = xdr_reserve_space(xdr, 4 + pathname_len);
29a1bd6b	288	xdr_encode_opaque(p, pathname, pathname_len);
29a1bd6b CL	289	}
	290
	291	static int mnt_enc_dirpath(struct rpc_rqst req, __be32 p,
	292	const char *dirpath)
	293	{
	294	struct xdr_stream xdr;
	295
	296	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
98eb2b4f CL	297	encode_mntdirpath(&xdr, dirpath);
98eb2b4f CL	298	return 0;
29a1bd6b CL	299	}
29a1bd6b CL	300
fb125295 CL	301	/*
	302	* RFC 1094: "A non-zero status indicates some sort of error. In this
	303	* case, the status is a UNIX error number." This can be problematic
	304	* if the server and client use different errno values for the same
	305	* error.
	306	*
	307	* However, the OpenGroup XNFS spec provides a simple mapping that is
	308	* independent of local errno values on the server and the client.
	309	*/
	310	static int decode_status(struct xdr_stream xdr, struct mountres res)
	311	{
	312	unsigned int i;
	313	u32 status;
	314	__be32 *p;
	315
98eb2b4f	316	p = xdr_inline_decode(xdr, 4);
fb125295 CL	317	if (unlikely(p == NULL))
fb125295 CL	318	return -EIO;
98eb2b4f	319	status = be32_to_cpup(p);
fb125295	320
dd8ac1da	321	for (i = 0; i < ARRAY_SIZE(mnt_errtbl); i++) {
fb125295 CL	322	if (mnt_errtbl[i].status == status) {
	323	res->errno = mnt_errtbl[i].errno;
	324	return 0;
	325	}
	326	}
	327
	328	dprintk("NFS: unrecognized MNT status code: %u\n", status);
	329	res->errno = -EACCES;
	330	return 0;
	331	}
	332
4fdcd996 CL	333	static int decode_fhandle(struct xdr_stream xdr, struct mountres res)
	334	{
	335	struct nfs_fh *fh = res->fh;
	336	__be32 *p;
	337
	338	p = xdr_inline_decode(xdr, NFS2_FHSIZE);
	339	if (unlikely(p == NULL))
	340	return -EIO;
	341
	342	fh->size = NFS2_FHSIZE;
	343	memcpy(fh->data, p, NFS2_FHSIZE);
	344	return 0;
	345	}
	346
8e02f6b9 CL	347	static int mnt_dec_mountres(struct rpc_rqst req, __be32 p,
	348	struct mountres *res)
	349	{
	350	struct xdr_stream xdr;
	351	int status;
	352
	353	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	354
	355	status = decode_status(&xdr, res);
	356	if (unlikely(status != 0 \|\| res->errno != 0))
	357	return status;
	358	return decode_fhandle(&xdr, res);
	359	}
	360
fb125295 CL	361	static int decode_fhs_status(struct xdr_stream xdr, struct mountres res)
	362	{
	363	unsigned int i;
	364	u32 status;
	365	__be32 *p;
	366
98eb2b4f	367	p = xdr_inline_decode(xdr, 4);
fb125295 CL	368	if (unlikely(p == NULL))
fb125295 CL	369	return -EIO;
98eb2b4f	370	status = be32_to_cpup(p);
fb125295	371
dd8ac1da	372	for (i = 0; i < ARRAY_SIZE(mnt3_errtbl); i++) {
fb125295 CL	373	if (mnt3_errtbl[i].status == status) {
	374	res->errno = mnt3_errtbl[i].errno;
	375	return 0;
	376	}
	377	}
	378
	379	dprintk("NFS: unrecognized MNT3 status code: %u\n", status);
	380	res->errno = -EACCES;
	381	return 0;
	382	}
	383
4fdcd996 CL	384	static int decode_fhandle3(struct xdr_stream xdr, struct mountres res)
	385	{
	386	struct nfs_fh *fh = res->fh;
	387	u32 size;
	388	__be32 *p;
	389
98eb2b4f	390	p = xdr_inline_decode(xdr, 4);
4fdcd996 CL	391	if (unlikely(p == NULL))
	392	return -EIO;
	393
98eb2b4f	394	size = be32_to_cpup(p);
4fdcd996 CL	395	if (size > NFS3_FHSIZE \|\| size == 0)
	396	return -EIO;
	397
	398	p = xdr_inline_decode(xdr, size);
	399	if (unlikely(p == NULL))
	400	return -EIO;
	401
	402	fh->size = size;
	403	memcpy(fh->data, p, size);
	404	return 0;
	405	}
	406
a14017db CL	407	static int decode_auth_flavors(struct xdr_stream xdr, struct mountres res)
	408	{
	409	rpc_authflavor_t *flavors = res->auth_flavors;
	410	unsigned int *count = res->auth_count;
	411	u32 entries, i;
	412	__be32 *p;
	413
	414	if (*count == 0)
	415	return 0;
	416
98eb2b4f	417	p = xdr_inline_decode(xdr, 4);
a14017db CL	418	if (unlikely(p == NULL))
a14017db CL	419	return -EIO;
98eb2b4f	420	entries = be32_to_cpup(p);
a14017db CL	421	dprintk("NFS: received %u auth flavors\n", entries);
	422	if (entries > NFS_MAX_SECFLAVORS)
	423	entries = NFS_MAX_SECFLAVORS;
	424
98eb2b4f	425	p = xdr_inline_decode(xdr, 4 * entries);
a14017db CL	426	if (unlikely(p == NULL))
	427	return -EIO;
	428
	429	if (entries > *count)
	430	entries = *count;
	431
	432	for (i = 0; i < entries; i++) {
98eb2b4f	433	flavors[i] = be32_to_cpup(p++);
ed58b291	434	dprintk("NFS: auth flavor[%u]: %d\n", i, flavors[i]);
a14017db CL	435	}
	436	*count = i;
	437
	438	return 0;
	439	}
	440
8e02f6b9 CL	441	static int mnt_dec_mountres3(struct rpc_rqst req, __be32 p,
	442	struct mountres *res)
	443	{
	444	struct xdr_stream xdr;
	445	int status;
	446
	447	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	448
	449	status = decode_fhs_status(&xdr, res);
	450	if (unlikely(status != 0 \|\| res->errno != 0))
	451	return status;
	452	status = decode_fhandle3(&xdr, res);
	453	if (unlikely(status != 0)) {
	454	res->errno = -EBADHANDLE;
	455	return 0;
	456	}
	457	return decode_auth_flavors(&xdr, res);
	458	}
	459
19207231	460	static struct rpc_procinfo mnt_procedures[] = {
2ad78097 CL	461	[MOUNTPROC_MNT] = {
2ad78097 CL	462	.p_proc = MOUNTPROC_MNT,
29a1bd6b	463	.p_encode = (kxdrproc_t)mnt_enc_dirpath,
8e02f6b9	464	.p_decode = (kxdrproc_t)mnt_dec_mountres,
29a1bd6b	465	.p_arglen = MNT_enc_dirpath_sz,
8e02f6b9	466	.p_replen = MNT_dec_mountres_sz,
2ad78097	467	.p_statidx = MOUNTPROC_MNT,
19207231	468	.p_name = "MOUNT",
1da177e4	469	},
0b524123 CL	470	[MOUNTPROC_UMNT] = {
	471	.p_proc = MOUNTPROC_UMNT,
	472	.p_encode = (kxdrproc_t)mnt_enc_dirpath,
	473	.p_arglen = MNT_enc_dirpath_sz,
	474	.p_statidx = MOUNTPROC_UMNT,
	475	.p_name = "UMOUNT",
	476	},
1da177e4 LT	477	};
	478
	479	static struct rpc_procinfo mnt3_procedures[] = {
19207231 CL	480	[MOUNTPROC3_MNT] = {
19207231 CL	481	.p_proc = MOUNTPROC3_MNT,
29a1bd6b	482	.p_encode = (kxdrproc_t)mnt_enc_dirpath,
8e02f6b9	483	.p_decode = (kxdrproc_t)mnt_dec_mountres3,
29a1bd6b	484	.p_arglen = MNT_enc_dirpath_sz,
8e02f6b9	485	.p_replen = MNT_dec_mountres3_sz,
19207231 CL	486	.p_statidx = MOUNTPROC3_MNT,
19207231 CL	487	.p_name = "MOUNT",
1da177e4	488	},
0b524123 CL	489	[MOUNTPROC3_UMNT] = {
	490	.p_proc = MOUNTPROC3_UMNT,
	491	.p_encode = (kxdrproc_t)mnt_enc_dirpath,
	492	.p_arglen = MNT_enc_dirpath_sz,
	493	.p_statidx = MOUNTPROC3_UMNT,
	494	.p_name = "UMOUNT",
	495	},
1da177e4 LT	496	};
	497
	498
19207231 CL	499	static struct rpc_version mnt_version1 = {
19207231 CL	500	.number = 1,
5b362ac3	501	.nrprocs = ARRAY_SIZE(mnt_procedures),
19207231	502	.procs = mnt_procedures,
1da177e4 LT	503	};
1da177e4 LT	504
19207231 CL	505	static struct rpc_version mnt_version3 = {
19207231 CL	506	.number = 3,
5b362ac3	507	.nrprocs = ARRAY_SIZE(mnt3_procedures),
19207231	508	.procs = mnt3_procedures,
1da177e4 LT	509	};
1da177e4 LT	510
19207231	511	static struct rpc_version *mnt_version[] = {
1da177e4 LT	512	NULL,
	513	&mnt_version1,
	514	NULL,
	515	&mnt_version3,
	516	};
	517
19207231	518	static struct rpc_stat mnt_stats;
1da177e4	519
19207231	520	static struct rpc_program mnt_program = {
1da177e4 LT	521	.name = "mount",
1da177e4 LT	522	.number = NFS_MNT_PROGRAM,
e8c96f8c	523	.nrvers = ARRAY_SIZE(mnt_version),
1da177e4 LT	524	.version = mnt_version,
	525	.stats = &mnt_stats,
	526	};