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Commit | Line | Data |
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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> |
16 | #include <linux/nfs_fs.h> | |
8491945f | 17 | #include "internal.h" |
1da177e4 LT |
18 | |
19 | #ifdef RPC_DEBUG | |
3ea97309 | 20 | # define NFSDBG_FACILITY NFSDBG_MOUNT |
1da177e4 LT |
21 | #endif |
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)) | |
32 | ||
33 | /* | |
34 | * XDR argument and result sizes | |
35 | */ | |
36 | #define MNT_enc_dirpath_sz encode_dirpath_sz | |
37 | ||
2ad78097 CL |
38 | /* |
39 | * Defined by RFC 1094, section A.5 | |
40 | */ | |
41 | enum { | |
42 | MOUNTPROC_NULL = 0, | |
43 | MOUNTPROC_MNT = 1, | |
44 | MOUNTPROC_DUMP = 2, | |
45 | MOUNTPROC_UMNT = 3, | |
46 | MOUNTPROC_UMNTALL = 4, | |
47 | MOUNTPROC_EXPORT = 5, | |
48 | }; | |
49 | ||
50 | /* | |
51 | * Defined by RFC 1813, section 5.2 | |
52 | */ | |
53 | enum { | |
54 | MOUNTPROC3_NULL = 0, | |
55 | MOUNTPROC3_MNT = 1, | |
56 | MOUNTPROC3_DUMP = 2, | |
57 | MOUNTPROC3_UMNT = 3, | |
58 | MOUNTPROC3_UMNTALL = 4, | |
59 | MOUNTPROC3_EXPORT = 5, | |
60 | }; | |
61 | ||
1da177e4 LT |
62 | static struct rpc_program mnt_program; |
63 | ||
64 | struct mnt_fhstatus { | |
19207231 CL |
65 | u32 status; |
66 | struct nfs_fh *fh; | |
1da177e4 LT |
67 | }; |
68 | ||
3ea97309 CL |
69 | /** |
70 | * nfs_mount - Obtain an NFS file handle for the given host and path | |
c5d120f8 | 71 | * @info: pointer to mount request arguments |
3ea97309 CL |
72 | * |
73 | * Uses default timeout parameters specified by underlying transport. | |
1da177e4 | 74 | */ |
c5d120f8 | 75 | int nfs_mount(struct nfs_mount_request *info) |
1da177e4 | 76 | { |
1da177e4 | 77 | struct mnt_fhstatus result = { |
c5d120f8 | 78 | .fh = info->fh |
1da177e4 | 79 | }; |
dead28da | 80 | struct rpc_message msg = { |
c5d120f8 | 81 | .rpc_argp = info->dirpath, |
dead28da CL |
82 | .rpc_resp = &result, |
83 | }; | |
3ea97309 | 84 | struct rpc_create_args args = { |
c5d120f8 CL |
85 | .protocol = info->protocol, |
86 | .address = info->sap, | |
87 | .addrsize = info->salen, | |
88 | .servername = info->hostname, | |
3ea97309 | 89 | .program = &mnt_program, |
c5d120f8 | 90 | .version = info->version, |
3ea97309 | 91 | .authflavor = RPC_AUTH_UNIX, |
3ea97309 CL |
92 | }; |
93 | struct rpc_clnt *mnt_clnt; | |
1da177e4 | 94 | int status; |
1da177e4 | 95 | |
3ea97309 | 96 | dprintk("NFS: sending MNT request for %s:%s\n", |
c5d120f8 CL |
97 | (info->hostname ? info->hostname : "server"), |
98 | info->dirpath); | |
1da177e4 | 99 | |
50a737f8 CL |
100 | if (info->noresvport) |
101 | args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; | |
102 | ||
3ea97309 | 103 | mnt_clnt = rpc_create(&args); |
1da177e4 | 104 | if (IS_ERR(mnt_clnt)) |
013a8c1a | 105 | goto out_clnt_err; |
1da177e4 | 106 | |
c5d120f8 | 107 | if (info->version == NFS_MNT3_VERSION) |
dead28da CL |
108 | msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT]; |
109 | else | |
2ad78097 | 110 | msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT]; |
dead28da CL |
111 | |
112 | status = rpc_call_sync(mnt_clnt, &msg, 0); | |
90c5755f | 113 | rpc_shutdown_client(mnt_clnt); |
013a8c1a CL |
114 | |
115 | if (status < 0) | |
116 | goto out_call_err; | |
117 | if (result.status != 0) | |
118 | goto out_mnt_err; | |
119 | ||
120 | dprintk("NFS: MNT request succeeded\n"); | |
121 | status = 0; | |
122 | ||
123 | out: | |
124 | return status; | |
125 | ||
126 | out_clnt_err: | |
127 | status = PTR_ERR(mnt_clnt); | |
128 | dprintk("NFS: failed to create RPC client, status=%d\n", status); | |
129 | goto out; | |
130 | ||
131 | out_call_err: | |
132 | dprintk("NFS: failed to start MNT request, status=%d\n", status); | |
133 | goto out; | |
134 | ||
135 | out_mnt_err: | |
136 | dprintk("NFS: MNT server returned result %d\n", result.status); | |
8491945f | 137 | status = nfs_stat_to_errno(result.status); |
013a8c1a | 138 | goto out; |
1da177e4 LT |
139 | } |
140 | ||
1da177e4 LT |
141 | /* |
142 | * XDR encode/decode functions for MOUNT | |
143 | */ | |
1da177e4 | 144 | |
29a1bd6b CL |
145 | static int encode_mntdirpath(struct xdr_stream *xdr, const char *pathname) |
146 | { | |
147 | const u32 pathname_len = strlen(pathname); | |
148 | __be32 *p; | |
149 | ||
150 | if (unlikely(pathname_len > MNTPATHLEN)) | |
151 | return -EIO; | |
152 | ||
153 | p = xdr_reserve_space(xdr, sizeof(u32) + pathname_len); | |
154 | if (unlikely(p == NULL)) | |
155 | return -EIO; | |
156 | xdr_encode_opaque(p, pathname, pathname_len); | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | static int mnt_enc_dirpath(struct rpc_rqst *req, __be32 *p, | |
162 | const char *dirpath) | |
163 | { | |
164 | struct xdr_stream xdr; | |
165 | ||
166 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); | |
167 | return encode_mntdirpath(&xdr, dirpath); | |
168 | } | |
169 | ||
19207231 CL |
170 | static int xdr_decode_fhstatus(struct rpc_rqst *req, __be32 *p, |
171 | struct mnt_fhstatus *res) | |
1da177e4 LT |
172 | { |
173 | struct nfs_fh *fh = res->fh; | |
174 | ||
175 | if ((res->status = ntohl(*p++)) == 0) { | |
176 | fh->size = NFS2_FHSIZE; | |
177 | memcpy(fh->data, p, NFS2_FHSIZE); | |
178 | } | |
179 | return 0; | |
180 | } | |
181 | ||
19207231 CL |
182 | static int xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p, |
183 | struct mnt_fhstatus *res) | |
1da177e4 LT |
184 | { |
185 | struct nfs_fh *fh = res->fh; | |
b7e24457 | 186 | unsigned size; |
1da177e4 LT |
187 | |
188 | if ((res->status = ntohl(*p++)) == 0) { | |
b7e24457 TM |
189 | size = ntohl(*p++); |
190 | if (size <= NFS3_FHSIZE && size != 0) { | |
1da177e4 LT |
191 | fh->size = size; |
192 | memcpy(fh->data, p, size); | |
193 | } else | |
194 | res->status = -EBADHANDLE; | |
195 | } | |
196 | return 0; | |
197 | } | |
198 | ||
1da177e4 | 199 | #define MNT_fhstatus_sz (1 + 8) |
2bea90d4 | 200 | #define MNT_fhstatus3_sz (1 + 16) |
1da177e4 | 201 | |
19207231 | 202 | static struct rpc_procinfo mnt_procedures[] = { |
2ad78097 CL |
203 | [MOUNTPROC_MNT] = { |
204 | .p_proc = MOUNTPROC_MNT, | |
29a1bd6b | 205 | .p_encode = (kxdrproc_t)mnt_enc_dirpath, |
19207231 | 206 | .p_decode = (kxdrproc_t) xdr_decode_fhstatus, |
29a1bd6b | 207 | .p_arglen = MNT_enc_dirpath_sz, |
19207231 | 208 | .p_replen = MNT_fhstatus_sz, |
2ad78097 | 209 | .p_statidx = MOUNTPROC_MNT, |
19207231 | 210 | .p_name = "MOUNT", |
1da177e4 LT |
211 | }, |
212 | }; | |
213 | ||
214 | static struct rpc_procinfo mnt3_procedures[] = { | |
19207231 CL |
215 | [MOUNTPROC3_MNT] = { |
216 | .p_proc = MOUNTPROC3_MNT, | |
29a1bd6b | 217 | .p_encode = (kxdrproc_t)mnt_enc_dirpath, |
19207231 | 218 | .p_decode = (kxdrproc_t) xdr_decode_fhstatus3, |
29a1bd6b | 219 | .p_arglen = MNT_enc_dirpath_sz, |
19207231 CL |
220 | .p_replen = MNT_fhstatus3_sz, |
221 | .p_statidx = MOUNTPROC3_MNT, | |
222 | .p_name = "MOUNT", | |
1da177e4 LT |
223 | }, |
224 | }; | |
225 | ||
226 | ||
19207231 CL |
227 | static struct rpc_version mnt_version1 = { |
228 | .number = 1, | |
229 | .nrprocs = 2, | |
230 | .procs = mnt_procedures, | |
1da177e4 LT |
231 | }; |
232 | ||
19207231 CL |
233 | static struct rpc_version mnt_version3 = { |
234 | .number = 3, | |
235 | .nrprocs = 2, | |
236 | .procs = mnt3_procedures, | |
1da177e4 LT |
237 | }; |
238 | ||
19207231 | 239 | static struct rpc_version *mnt_version[] = { |
1da177e4 LT |
240 | NULL, |
241 | &mnt_version1, | |
242 | NULL, | |
243 | &mnt_version3, | |
244 | }; | |
245 | ||
19207231 | 246 | static struct rpc_stat mnt_stats; |
1da177e4 | 247 | |
19207231 | 248 | static struct rpc_program mnt_program = { |
1da177e4 LT |
249 | .name = "mount", |
250 | .number = NFS_MNT_PROGRAM, | |
e8c96f8c | 251 | .nrvers = ARRAY_SIZE(mnt_version), |
1da177e4 LT |
252 | .version = mnt_version, |
253 | .stats = &mnt_stats, | |
254 | }; |