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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/mount_clnt.c | |
3 | * | |
4 | * MOUNT client to support NFSroot. | |
5 | * | |
6 | * Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
9 | #include <linux/types.h> | |
10 | #include <linux/socket.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/uio.h> | |
14 | #include <linux/net.h> | |
15 | #include <linux/in.h> | |
16 | #include <linux/sunrpc/clnt.h> | |
1da177e4 LT |
17 | #include <linux/sunrpc/sched.h> |
18 | #include <linux/nfs_fs.h> | |
19 | ||
20 | #ifdef RPC_DEBUG | |
3ea97309 | 21 | # define NFSDBG_FACILITY NFSDBG_MOUNT |
1da177e4 LT |
22 | #endif |
23 | ||
24 | /* | |
25 | #define MOUNT_PROGRAM 100005 | |
26 | #define MOUNT_VERSION 1 | |
27 | #define MOUNT_MNT 1 | |
28 | #define MOUNT_UMNT 3 | |
29 | */ | |
30 | ||
1da177e4 LT |
31 | static struct rpc_program mnt_program; |
32 | ||
33 | struct mnt_fhstatus { | |
34 | unsigned int status; | |
35 | struct nfs_fh * fh; | |
36 | }; | |
37 | ||
3ea97309 CL |
38 | /** |
39 | * nfs_mount - Obtain an NFS file handle for the given host and path | |
40 | * @addr: pointer to server's address | |
41 | * @len: size of server's address | |
42 | * @hostname: name of server host, or NULL | |
43 | * @path: pointer to string containing export path to mount | |
44 | * @version: mount version to use for this request | |
45 | * @protocol: transport protocol to use for thie request | |
46 | * @fh: pointer to location to place returned file handle | |
47 | * | |
48 | * Uses default timeout parameters specified by underlying transport. | |
1da177e4 | 49 | */ |
3ea97309 CL |
50 | int nfs_mount(struct sockaddr *addr, size_t len, char *hostname, char *path, |
51 | int version, int protocol, struct nfs_fh *fh) | |
1da177e4 | 52 | { |
1da177e4 LT |
53 | struct mnt_fhstatus result = { |
54 | .fh = fh | |
55 | }; | |
dead28da CL |
56 | struct rpc_message msg = { |
57 | .rpc_argp = path, | |
58 | .rpc_resp = &result, | |
59 | }; | |
3ea97309 CL |
60 | struct rpc_create_args args = { |
61 | .protocol = protocol, | |
62 | .address = addr, | |
63 | .addrsize = len, | |
64 | .servername = hostname, | |
65 | .program = &mnt_program, | |
66 | .version = version, | |
67 | .authflavor = RPC_AUTH_UNIX, | |
68 | .flags = RPC_CLNT_CREATE_INTR, | |
69 | }; | |
70 | struct rpc_clnt *mnt_clnt; | |
1da177e4 | 71 | int status; |
1da177e4 | 72 | |
3ea97309 CL |
73 | dprintk("NFS: sending MNT request for %s:%s\n", |
74 | (hostname ? hostname : "server"), path); | |
1da177e4 | 75 | |
3ea97309 | 76 | mnt_clnt = rpc_create(&args); |
1da177e4 LT |
77 | if (IS_ERR(mnt_clnt)) |
78 | return PTR_ERR(mnt_clnt); | |
79 | ||
dead28da CL |
80 | if (version == NFS_MNT3_VERSION) |
81 | msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT]; | |
82 | else | |
83 | msg.rpc_proc = &mnt_clnt->cl_procinfo[MNTPROC_MNT]; | |
84 | ||
85 | status = rpc_call_sync(mnt_clnt, &msg, 0); | |
90c5755f | 86 | rpc_shutdown_client(mnt_clnt); |
1da177e4 LT |
87 | return status < 0? status : (result.status? -EACCES : 0); |
88 | } | |
89 | ||
1da177e4 LT |
90 | /* |
91 | * XDR encode/decode functions for MOUNT | |
92 | */ | |
93 | static int | |
d21ec0c3 | 94 | xdr_encode_dirpath(struct rpc_rqst *req, __be32 *p, const char *path) |
1da177e4 LT |
95 | { |
96 | p = xdr_encode_string(p, path); | |
97 | ||
98 | req->rq_slen = xdr_adjust_iovec(req->rq_svec, p); | |
99 | return 0; | |
100 | } | |
101 | ||
102 | static int | |
d21ec0c3 | 103 | xdr_decode_fhstatus(struct rpc_rqst *req, __be32 *p, struct mnt_fhstatus *res) |
1da177e4 LT |
104 | { |
105 | struct nfs_fh *fh = res->fh; | |
106 | ||
107 | if ((res->status = ntohl(*p++)) == 0) { | |
108 | fh->size = NFS2_FHSIZE; | |
109 | memcpy(fh->data, p, NFS2_FHSIZE); | |
110 | } | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static int | |
d21ec0c3 | 115 | xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p, struct mnt_fhstatus *res) |
1da177e4 LT |
116 | { |
117 | struct nfs_fh *fh = res->fh; | |
118 | ||
119 | if ((res->status = ntohl(*p++)) == 0) { | |
120 | int size = ntohl(*p++); | |
121 | if (size <= NFS3_FHSIZE) { | |
122 | fh->size = size; | |
123 | memcpy(fh->data, p, size); | |
124 | } else | |
125 | res->status = -EBADHANDLE; | |
126 | } | |
127 | return 0; | |
128 | } | |
129 | ||
130 | #define MNT_dirpath_sz (1 + 256) | |
131 | #define MNT_fhstatus_sz (1 + 8) | |
2bea90d4 | 132 | #define MNT_fhstatus3_sz (1 + 16) |
1da177e4 LT |
133 | |
134 | static struct rpc_procinfo mnt_procedures[] = { | |
135 | [MNTPROC_MNT] = { | |
136 | .p_proc = MNTPROC_MNT, | |
137 | .p_encode = (kxdrproc_t) xdr_encode_dirpath, | |
138 | .p_decode = (kxdrproc_t) xdr_decode_fhstatus, | |
2bea90d4 CL |
139 | .p_arglen = MNT_dirpath_sz, |
140 | .p_replen = MNT_fhstatus_sz, | |
cc0175c1 CL |
141 | .p_statidx = MNTPROC_MNT, |
142 | .p_name = "MOUNT", | |
1da177e4 LT |
143 | }, |
144 | }; | |
145 | ||
146 | static struct rpc_procinfo mnt3_procedures[] = { | |
147 | [MOUNTPROC3_MNT] = { | |
148 | .p_proc = MOUNTPROC3_MNT, | |
149 | .p_encode = (kxdrproc_t) xdr_encode_dirpath, | |
150 | .p_decode = (kxdrproc_t) xdr_decode_fhstatus3, | |
2bea90d4 CL |
151 | .p_arglen = MNT_dirpath_sz, |
152 | .p_replen = MNT_fhstatus3_sz, | |
cc0175c1 CL |
153 | .p_statidx = MOUNTPROC3_MNT, |
154 | .p_name = "MOUNT", | |
1da177e4 LT |
155 | }, |
156 | }; | |
157 | ||
158 | ||
159 | static struct rpc_version mnt_version1 = { | |
160 | .number = 1, | |
161 | .nrprocs = 2, | |
162 | .procs = mnt_procedures | |
163 | }; | |
164 | ||
165 | static struct rpc_version mnt_version3 = { | |
166 | .number = 3, | |
167 | .nrprocs = 2, | |
168 | .procs = mnt3_procedures | |
169 | }; | |
170 | ||
171 | static struct rpc_version * mnt_version[] = { | |
172 | NULL, | |
173 | &mnt_version1, | |
174 | NULL, | |
175 | &mnt_version3, | |
176 | }; | |
177 | ||
178 | static struct rpc_stat mnt_stats; | |
179 | ||
180 | static struct rpc_program mnt_program = { | |
181 | .name = "mount", | |
182 | .number = NFS_MNT_PROGRAM, | |
e8c96f8c | 183 | .nrvers = ARRAY_SIZE(mnt_version), |
1da177e4 LT |
184 | .version = mnt_version, |
185 | .stats = &mnt_stats, | |
186 | }; |