1 // SPDX-License-Identifier: GPL-2.0
3  * In-kernel MOUNT protocol client
28  * XDR data type sizes
37  * XDR argument and result sizes
82 	u32 status;  member
85 	{ .status = MNT_OK,			.errno = 0,		},
86 	{ .status = MNT_EPERM,			.errno = -EPERM,	},
87 	{ .status = MNT_ENOENT,			.errno = -ENOENT,	},
88 	{ .status = MNT_EACCES,			.errno = -EACCES,	},
89 	{ .status = MNT_EINVAL,			.errno = -EINVAL,	},
109 	u32 status;  member
112 	{ .status = MNT3_OK,			.errno = 0,		},
113 	{ .status = MNT3ERR_PERM,		.errno = -EPERM,	},
114 	{ .status = MNT3ERR_NOENT,		.errno = -ENOENT,	},
115 	{ .status = MNT3ERR_IO,			.errno = -EIO,		},
116 	{ .status = MNT3ERR_ACCES,		.errno = -EACCES,	},
117 	{ .status = MNT3ERR_NOTDIR,		.errno = -ENOTDIR,	},
118 	{ .status = MNT3ERR_INVAL,		.errno = -EINVAL,	},
119 	{ .status = MNT3ERR_NAMETOOLONG,	.errno = -ENAMETOOLONG,	},
120 	{ .status = MNT3ERR_NOTSUPP,		.errno = -ENOTSUPP,	},
121 	{ .status = MNT3ERR_SERVERFAULT,	.errno = -EREMOTEIO,	},
132  * nfs_mount - Obtain an NFS file handle for the given host and path
139  * server or a faked-up list if the server didn't provide one.
145 		.fh		= info->fh,  in nfs_mount()
146 		.auth_count	= info->auth_flav_len,  in nfs_mount()
147 		.auth_flavors	= info->auth_flavs,  in nfs_mount()
150 		.rpc_argp	= info->dirpath,  in nfs_mount()
154 		.net		= info->net,  in nfs_mount()
155 		.protocol	= info->protocol,  in nfs_mount()
156 		.address	= (struct sockaddr *)info->sap,  in nfs_mount()
157 		.addrsize	= info->salen,  in nfs_mount()
159 		.servername	= info->hostname,  in nfs_mount()
161 		.version	= info->version,  in nfs_mount()
166 	int			status;  in nfs_mount()  local
169 		(info->hostname ? info->hostname : "server"),  in nfs_mount()
170 			info->dirpath);  in nfs_mount()
172 	if (strlen(info->dirpath) > MNTPATHLEN)  in nfs_mount()
173 		return -ENAMETOOLONG;  in nfs_mount()
175 	if (info->noresvport)  in nfs_mount()
178 	nfs_init_timeout_values(&mnt_timeout, info->protocol, timeo, retrans);  in nfs_mount()
183 	if (info->version == NFS_MNT3_VERSION)  in nfs_mount()
184 		msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];  in nfs_mount()
186 		msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT];  in nfs_mount()
188 	status = rpc_call_sync(mnt_clnt, &msg, RPC_TASK_SOFT|RPC_TASK_TIMEOUT);  in nfs_mount()
191 	if (status < 0)  in nfs_mount()
197 	status = 0;  in nfs_mount()
203 	if (info->version != NFS_MNT3_VERSION || *info->auth_flav_len == 0) {  in nfs_mount()
205 		info->auth_flavs[0] = RPC_AUTH_NULL;  in nfs_mount()
206 		*info->auth_flav_len = 1;  in nfs_mount()
209 	return status;  in nfs_mount()
212 	status = PTR_ERR(mnt_clnt);  in nfs_mount()
213 	dprintk("NFS: failed to create MNT RPC client, status=%d\n", status);  in nfs_mount()
217 	dprintk("NFS: MNT request failed, status=%d\n", status);  in nfs_mount()
222 	status = result.errno;  in nfs_mount()
246  * RFC 1094: "A non-zero status indicates some sort of error.  In this
247  * case, the status is a UNIX error number."  This can be problematic
257 	u32 status;  in decode_status()  local
262 		return -EIO;  in decode_status()
263 	status = be32_to_cpup(p);  in decode_status()
266 		if (mnt_errtbl[i].status == status) {  in decode_status()
267 			res->errno = mnt_errtbl[i].errno;  in decode_status()
272 	dprintk("NFS: unrecognized MNT status code: %u\n", status);  in decode_status()
273 	res->errno = -EACCES;  in decode_status()
279 	struct nfs_fh *fh = res->fh;  in decode_fhandle()
284 		return -EIO;  in decode_fhandle()
286 	fh->size = NFS2_FHSIZE;  in decode_fhandle()
287 	memcpy(fh->data, p, NFS2_FHSIZE);  in decode_fhandle()
296 	int status;  in mnt_xdr_dec_mountres()  local
298 	status = decode_status(xdr, res);  in mnt_xdr_dec_mountres()
299 	if (unlikely(status != 0 || res->errno != 0))  in mnt_xdr_dec_mountres()
300 		return status;  in mnt_xdr_dec_mountres()
307 	u32 status;  in decode_fhs_status()  local
312 		return -EIO;  in decode_fhs_status()
313 	status = be32_to_cpup(p);  in decode_fhs_status()
316 		if (mnt3_errtbl[i].status == status) {  in decode_fhs_status()
317 			res->errno = mnt3_errtbl[i].errno;  in decode_fhs_status()
322 	dprintk("NFS: unrecognized MNT3 status code: %u\n", status);  in decode_fhs_status()
323 	res->errno = -EACCES;  in decode_fhs_status()
329 	struct nfs_fh *fh = res->fh;  in decode_fhandle3()
335 		return -EIO;  in decode_fhandle3()
339 		return -EIO;  in decode_fhandle3()
343 		return -EIO;  in decode_fhandle3()
345 	fh->size = size;  in decode_fhandle3()
346 	memcpy(fh->data, p, size);  in decode_fhandle3()
352 	rpc_authflavor_t *flavors = res->auth_flavors;  in decode_auth_flavors()
353 	unsigned int *count = res->auth_count;  in decode_auth_flavors()
362 		return -EIO;  in decode_auth_flavors()
370 		return -EIO;  in decode_auth_flavors()
389 	int status;  in mnt_xdr_dec_mountres3()  local
391 	status = decode_fhs_status(xdr, res);  in mnt_xdr_dec_mountres3()
392 	if (unlikely(status != 0 || res->errno != 0))  in mnt_xdr_dec_mountres3()
393 		return status;  in mnt_xdr_dec_mountres3()
394 	status = decode_fhandle3(xdr, res);  in mnt_xdr_dec_mountres3()
395 	if (unlikely(status != 0)) {  in mnt_xdr_dec_mountres3()
396 		res->errno = -EBADHANDLE;  in mnt_xdr_dec_mountres3()