2 * In-kernel MOUNT protocol client
4 * Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de>
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>
14 #include <linux/sunrpc/clnt.h>
15 #include <linux/sunrpc/sched.h>
16 #include <linux/nfs_fs.h>
20 # define NFSDBG_FACILITY NFSDBG_MOUNT
24 * Defined by RFC 1094, section A.3; and RFC 1813, section 5.1.4
26 #define MNTPATHLEN (1024)
31 #define encode_dirpath_sz (1 + XDR_QUADLEN(MNTPATHLEN))
32 #define MNT_status_sz (1)
33 #define MNT_fhs_status_sz (1)
36 * XDR argument and result sizes
38 #define MNT_enc_dirpath_sz encode_dirpath_sz
41 * Defined by RFC 1094, section A.5
48 MOUNTPROC_UMNTALL = 4,
53 * Defined by RFC 1813, section 5.2
60 MOUNTPROC3_UMNTALL = 4,
61 MOUNTPROC3_EXPORT = 5,
64 static struct rpc_program mnt_program;
67 * Defined by OpenGroup XNFS Version 3W, chapter 8
81 { .status = MNT_OK, .errno = 0, },
82 { .status = MNT_EPERM, .errno = -EPERM, },
83 { .status = MNT_ENOENT, .errno = -ENOENT, },
84 { .status = MNT_EACCES, .errno = -EACCES, },
85 { .status = MNT_EINVAL, .errno = -EINVAL, },
89 * Defined by RFC 1813, section 5.1.5
92 MNT3_OK = 0, /* no error */
93 MNT3ERR_PERM = 1, /* Not owner */
94 MNT3ERR_NOENT = 2, /* No such file or directory */
95 MNT3ERR_IO = 5, /* I/O error */
96 MNT3ERR_ACCES = 13, /* Permission denied */
97 MNT3ERR_NOTDIR = 20, /* Not a directory */
98 MNT3ERR_INVAL = 22, /* Invalid argument */
99 MNT3ERR_NAMETOOLONG = 63, /* Filename too long */
100 MNT3ERR_NOTSUPP = 10004, /* Operation not supported */
101 MNT3ERR_SERVERFAULT = 10006, /* A failure on the server */
108 { .status = MNT3_OK, .errno = 0, },
109 { .status = MNT3ERR_PERM, .errno = -EPERM, },
110 { .status = MNT3ERR_NOENT, .errno = -ENOENT, },
111 { .status = MNT3ERR_IO, .errno = -EIO, },
112 { .status = MNT3ERR_ACCES, .errno = -EACCES, },
113 { .status = MNT3ERR_NOTDIR, .errno = -ENOTDIR, },
114 { .status = MNT3ERR_INVAL, .errno = -EINVAL, },
115 { .status = MNT3ERR_NAMETOOLONG, .errno = -ENAMETOOLONG, },
116 { .status = MNT3ERR_NOTSUPP, .errno = -ENOTSUPP, },
117 { .status = MNT3ERR_SERVERFAULT, .errno = -ESERVERFAULT, },
125 struct mnt_fhstatus {
131 * nfs_mount - Obtain an NFS file handle for the given host and path
132 * @info: pointer to mount request arguments
134 * Uses default timeout parameters specified by underlying transport.
136 int nfs_mount(struct nfs_mount_request *info)
138 struct mnt_fhstatus result = {
141 struct rpc_message msg = {
142 .rpc_argp = info->dirpath,
145 struct rpc_create_args args = {
146 .protocol = info->protocol,
147 .address = info->sap,
148 .addrsize = info->salen,
149 .servername = info->hostname,
150 .program = &mnt_program,
151 .version = info->version,
152 .authflavor = RPC_AUTH_UNIX,
154 struct rpc_clnt *mnt_clnt;
157 dprintk("NFS: sending MNT request for %s:%s\n",
158 (info->hostname ? info->hostname : "server"),
161 if (info->noresvport)
162 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
164 mnt_clnt = rpc_create(&args);
165 if (IS_ERR(mnt_clnt))
168 if (info->version == NFS_MNT3_VERSION)
169 msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
171 msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT];
173 status = rpc_call_sync(mnt_clnt, &msg, 0);
174 rpc_shutdown_client(mnt_clnt);
178 if (result.status != 0)
181 dprintk("NFS: MNT request succeeded\n");
188 status = PTR_ERR(mnt_clnt);
189 dprintk("NFS: failed to create RPC client, status=%d\n", status);
193 dprintk("NFS: failed to start MNT request, status=%d\n", status);
197 dprintk("NFS: MNT server returned result %d\n", result.status);
198 status = nfs_stat_to_errno(result.status);
203 * XDR encode/decode functions for MOUNT
206 static int encode_mntdirpath(struct xdr_stream *xdr, const char *pathname)
208 const u32 pathname_len = strlen(pathname);
211 if (unlikely(pathname_len > MNTPATHLEN))
214 p = xdr_reserve_space(xdr, sizeof(u32) + pathname_len);
215 if (unlikely(p == NULL))
217 xdr_encode_opaque(p, pathname, pathname_len);
222 static int mnt_enc_dirpath(struct rpc_rqst *req, __be32 *p,
225 struct xdr_stream xdr;
227 xdr_init_encode(&xdr, &req->rq_snd_buf, p);
228 return encode_mntdirpath(&xdr, dirpath);
231 static int xdr_decode_fhstatus(struct rpc_rqst *req, __be32 *p,
232 struct mnt_fhstatus *res)
234 struct nfs_fh *fh = res->fh;
236 if ((res->status = ntohl(*p++)) == 0) {
237 fh->size = NFS2_FHSIZE;
238 memcpy(fh->data, p, NFS2_FHSIZE);
244 * RFC 1094: "A non-zero status indicates some sort of error. In this
245 * case, the status is a UNIX error number." This can be problematic
246 * if the server and client use different errno values for the same
249 * However, the OpenGroup XNFS spec provides a simple mapping that is
250 * independent of local errno values on the server and the client.
252 static int decode_status(struct xdr_stream *xdr, struct mountres *res)
258 p = xdr_inline_decode(xdr, sizeof(status));
259 if (unlikely(p == NULL))
263 for (i = 0; i <= ARRAY_SIZE(mnt_errtbl); i++) {
264 if (mnt_errtbl[i].status == status) {
265 res->errno = mnt_errtbl[i].errno;
270 dprintk("NFS: unrecognized MNT status code: %u\n", status);
271 res->errno = -EACCES;
275 static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res)
281 p = xdr_inline_decode(xdr, sizeof(status));
282 if (unlikely(p == NULL))
286 for (i = 0; i <= ARRAY_SIZE(mnt3_errtbl); i++) {
287 if (mnt3_errtbl[i].status == status) {
288 res->errno = mnt3_errtbl[i].errno;
293 dprintk("NFS: unrecognized MNT3 status code: %u\n", status);
294 res->errno = -EACCES;
298 static int xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p,
299 struct mnt_fhstatus *res)
301 struct nfs_fh *fh = res->fh;
304 if ((res->status = ntohl(*p++)) == 0) {
306 if (size <= NFS3_FHSIZE && size != 0) {
308 memcpy(fh->data, p, size);
310 res->status = -EBADHANDLE;
315 #define MNT_fhstatus_sz (1 + 8)
316 #define MNT_fhstatus3_sz (1 + 16)
318 static struct rpc_procinfo mnt_procedures[] = {
320 .p_proc = MOUNTPROC_MNT,
321 .p_encode = (kxdrproc_t)mnt_enc_dirpath,
322 .p_decode = (kxdrproc_t) xdr_decode_fhstatus,
323 .p_arglen = MNT_enc_dirpath_sz,
324 .p_replen = MNT_fhstatus_sz,
325 .p_statidx = MOUNTPROC_MNT,
330 static struct rpc_procinfo mnt3_procedures[] = {
332 .p_proc = MOUNTPROC3_MNT,
333 .p_encode = (kxdrproc_t)mnt_enc_dirpath,
334 .p_decode = (kxdrproc_t) xdr_decode_fhstatus3,
335 .p_arglen = MNT_enc_dirpath_sz,
336 .p_replen = MNT_fhstatus3_sz,
337 .p_statidx = MOUNTPROC3_MNT,
343 static struct rpc_version mnt_version1 = {
346 .procs = mnt_procedures,
349 static struct rpc_version mnt_version3 = {
352 .procs = mnt3_procedures,
355 static struct rpc_version *mnt_version[] = {
362 static struct rpc_stat mnt_stats;
364 static struct rpc_program mnt_program = {
366 .number = NFS_MNT_PROGRAM,
367 .nrvers = ARRAY_SIZE(mnt_version),
368 .version = mnt_version,