1 /*
2 * In-kernel MOUNT protocol client
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>
15 #include <linux/sunrpc/sched.h>
16 #include <linux/nfs_fs.h>
17
18 #ifdef RPC_DEBUG
19 # define NFSDBG_FACILITY NFSDBG_MOUNT
20 #endif
21
22 static struct rpc_program mnt_program;
23
24 struct mnt_fhstatus {
25 u32 status;
26 struct nfs_fh *fh;
27 };
28
29 /**
30 * nfs_mount - Obtain an NFS file handle for the given host and path
31 * @addr: pointer to server's address
32 * @len: size of server's address
33 * @hostname: name of server host, or NULL
34 * @path: pointer to string containing export path to mount
35 * @version: mount version to use for this request
36 * @protocol: transport protocol to use for thie request
37 * @fh: pointer to location to place returned file handle
38 *
39 * Uses default timeout parameters specified by underlying transport.
40 */
41 int nfs_mount(struct sockaddr *addr, size_t len, char *hostname, char *path,
42 int version, int protocol, struct nfs_fh *fh)
43 {
44 struct mnt_fhstatus result = {
45 .fh = fh
46 };
47 struct rpc_message msg = {
48 .rpc_argp = path,
49 .rpc_resp = &result,
50 };
51 struct rpc_create_args args = {
52 .protocol = protocol,
53 .address = addr,
54 .addrsize = len,
55 .servername = hostname,
56 .program = &mnt_program,
57 .version = version,
58 .authflavor = RPC_AUTH_UNIX,
59 .flags = 0,
60 };
61 struct rpc_clnt *mnt_clnt;
62 int status;
63
64 dprintk("NFS: sending MNT request for %s:%s\n",
65 (hostname ? hostname : "server"), path);
66
67 mnt_clnt = rpc_create(&args);
68 if (IS_ERR(mnt_clnt))
69 goto out_clnt_err;
70
71 if (version == NFS_MNT3_VERSION)
72 msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
73 else
74 msg.rpc_proc = &mnt_clnt->cl_procinfo[MNTPROC_MNT];
75
76 status = rpc_call_sync(mnt_clnt, &msg, 0);
77 rpc_shutdown_client(mnt_clnt);
78
79 if (status < 0)
80 goto out_call_err;
81 if (result.status != 0)
82 goto out_mnt_err;
83
84 dprintk("NFS: MNT request succeeded\n");
85 status = 0;
86
87 out:
88 return status;
89
90 out_clnt_err:
91 status = PTR_ERR(mnt_clnt);
92 dprintk("NFS: failed to create RPC client, status=%d\n", status);
93 goto out;
94
95 out_call_err:
96 dprintk("NFS: failed to start MNT request, status=%d\n", status);
97 goto out;
98
99 out_mnt_err:
100 dprintk("NFS: MNT server returned result %d\n", result.status);
101 status = -EACCES;
102 goto out;
103 }
104
105 /*
106 * XDR encode/decode functions for MOUNT
107 */
108 static int xdr_encode_dirpath(struct rpc_rqst *req, __be32 *p,
109 const char *path)
110 {
111 p = xdr_encode_string(p, path);
112
113 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
114 return 0;
115 }
116
117 static int xdr_decode_fhstatus(struct rpc_rqst *req, __be32 *p,
118 struct mnt_fhstatus *res)
119 {
120 struct nfs_fh *fh = res->fh;
121
122 if ((res->status = ntohl(*p++)) == 0) {
123 fh->size = NFS2_FHSIZE;
124 memcpy(fh->data, p, NFS2_FHSIZE);
125 }
126 return 0;
127 }
128
129 static int xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p,
130 struct mnt_fhstatus *res)
131 {
132 struct nfs_fh *fh = res->fh;
133
134 if ((res->status = ntohl(*p++)) == 0) {
135 int size = ntohl(*p++);
136 if (size <= NFS3_FHSIZE) {
137 fh->size = size;
138 memcpy(fh->data, p, size);
139 } else
140 res->status = -EBADHANDLE;
141 }
142 return 0;
143 }
144
145 #define MNT_dirpath_sz (1 + 256)
146 #define MNT_fhstatus_sz (1 + 8)
147 #define MNT_fhstatus3_sz (1 + 16)
148
149 static struct rpc_procinfo mnt_procedures[] = {
150 [MNTPROC_MNT] = {
151 .p_proc = MNTPROC_MNT,
152 .p_encode = (kxdrproc_t) xdr_encode_dirpath,
153 .p_decode = (kxdrproc_t) xdr_decode_fhstatus,
154 .p_arglen = MNT_dirpath_sz,
155 .p_replen = MNT_fhstatus_sz,
156 .p_statidx = MNTPROC_MNT,
157 .p_name = "MOUNT",
158 },
159 };
160
161 static struct rpc_procinfo mnt3_procedures[] = {
162 [MOUNTPROC3_MNT] = {
163 .p_proc = MOUNTPROC3_MNT,
164 .p_encode = (kxdrproc_t) xdr_encode_dirpath,
165 .p_decode = (kxdrproc_t) xdr_decode_fhstatus3,
166 .p_arglen = MNT_dirpath_sz,
167 .p_replen = MNT_fhstatus3_sz,
168 .p_statidx = MOUNTPROC3_MNT,
169 .p_name = "MOUNT",
170 },
171 };
172
173
174 static struct rpc_version mnt_version1 = {
175 .number = 1,
176 .nrprocs = 2,
177 .procs = mnt_procedures,
178 };
179
180 static struct rpc_version mnt_version3 = {
181 .number = 3,
182 .nrprocs = 2,
183 .procs = mnt3_procedures,
184 };
185
186 static struct rpc_version *mnt_version[] = {
187 NULL,
188 &mnt_version1,
189 NULL,
190 &mnt_version3,
191 };
192
193 static struct rpc_stat mnt_stats;
194
195 static struct rpc_program mnt_program = {
196 .name = "mount",
197 .number = NFS_MNT_PROGRAM,
198 .nrvers = ARRAY_SIZE(mnt_version),
199 .version = mnt_version,
200 .stats = &mnt_stats,
201 };
202
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