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/inet.h>
17 #include <linux/sunrpc/clnt.h>
18 #include <linux/sunrpc/xprt.h>
19 #include <linux/sunrpc/sched.h>
20 #include <linux/nfs_fs.h>
21
22 #ifdef RPC_DEBUG
23 # define NFSDBG_FACILITY NFSDBG_ROOT
24 #endif
25
26 /*
27 #define MOUNT_PROGRAM 100005
28 #define MOUNT_VERSION 1
29 #define MOUNT_MNT 1
30 #define MOUNT_UMNT 3
31 */
32
33 static int nfs_gen_mount(struct sockaddr_in *,
34 char *, struct nfs_fh *, int);
35 static struct rpc_clnt * mnt_create(char *, struct sockaddr_in *, int);
36 extern struct rpc_program mnt_program;
37
38 struct mnt_fhstatus {
39 unsigned int status;
40 struct nfs_fh * fh;
41 };
42
43 /*
44 * Obtain an NFS file handle for the given host and path
45 */
46 int
47 nfs_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh)
48 {
49 return nfs_gen_mount(addr, path, fh, NFS_MNT_VERSION);
50 }
51
52 int
53 nfs3_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh)
54 {
55 return nfs_gen_mount(addr, path, fh, NFS_MNT3_VERSION);
56 }
57
58 static int
59 nfs_gen_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh, int version)
60 {
61 struct rpc_clnt *mnt_clnt;
62 struct mnt_fhstatus result = { 0, fh };
63 char hostname[32];
64 int status;
65 int call;
66
67 dprintk("NFS: nfs_mount(%08x:%s)\n",
68 (unsigned)ntohl(addr->sin_addr.s_addr), path);
69
70 strcpy(hostname, in_ntoa(addr->sin_addr.s_addr));
71 if (!(mnt_clnt = mnt_create(hostname, addr, version)))
72 return -EACCES;
73
74 call = (version == 3) ? MOUNTPROC3_MNT : MNTPROC_MNT;
75 status = rpc_call(mnt_clnt, call, path, &result, 0);
76 return status < 0? status : (result.status? -EACCES : 0);
77 }
78
79 static struct rpc_clnt *
80 mnt_create(char *hostname, struct sockaddr_in *srvaddr, int version)
81 {
82 struct rpc_xprt *xprt;
83 struct rpc_clnt *clnt;
84
85 if (!(xprt = xprt_create_proto(IPPROTO_UDP, srvaddr, NULL)))
86 return NULL;
87
88 clnt = rpc_create_client(xprt, hostname,
89 &mnt_program, version,
90 RPC_AUTH_NULL);
91 if (!clnt) {
92 xprt_destroy(xprt);
93 } else {
94 clnt->cl_softrtry = 1;
95 clnt->cl_chatty = 1;
96 clnt->cl_oneshot = 1;
97 clnt->cl_intr = 1;
98 }
99 return clnt;
100 }
101
102 /*
103 * XDR encode/decode functions for MOUNT
104 */
105 static int
106 xdr_error(struct rpc_rqst *req, u32 *p, void *dummy)
107 {
108 return -EIO;
109 }
110
111 static int
112 xdr_encode_dirpath(struct rpc_rqst *req, u32 *p, const char *path)
113 {
114 p = xdr_encode_string(p, path);
115
116 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
117 return 0;
118 }
119
120 static int
121 xdr_decode_fhstatus(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res)
122 {
123 struct nfs_fh *fh = res->fh;
124
125 memset((void *)fh, 0, sizeof(*fh));
126 if ((res->status = ntohl(*p++)) == 0) {
127 fh->size = NFS2_FHSIZE;
128 memcpy(fh->data, p, NFS2_FHSIZE);
129 }
130 return 0;
131 }
132
133 static int
134 xdr_decode_fhstatus3(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res)
135 {
136 struct nfs_fh *fh = res->fh;
137
138 memset((void *)fh, 0, sizeof(*fh));
139 if ((res->status = ntohl(*p++)) == 0) {
140 int size = ntohl(*p++);
141 if (size <= NFS3_FHSIZE) {
142 fh->size = size;
143 memcpy(fh->data, p, size);
144 } else
145 res->status = -EBADHANDLE;
146 }
147 return 0;
148 }
149
150 #define MNT_dirpath_sz (1 + 256)
151 #define MNT_fhstatus_sz (1 + 8)
152
153 static struct rpc_procinfo mnt_procedures[2] = {
154 { "mnt_null",
155 (kxdrproc_t) xdr_error,
156 (kxdrproc_t) xdr_error, 0, 0 },
157 { "mnt_mount",
158 (kxdrproc_t) xdr_encode_dirpath,
159 (kxdrproc_t) xdr_decode_fhstatus,
160 MNT_dirpath_sz << 2, 0 },
161 };
162
163 static struct rpc_procinfo mnt3_procedures[2] = {
164 { "mnt3_null",
165 (kxdrproc_t) xdr_error,
166 (kxdrproc_t) xdr_error, 0, 0 },
167 { "mnt3_mount",
168 (kxdrproc_t) xdr_encode_dirpath,
169 (kxdrproc_t) xdr_decode_fhstatus3,
170 MNT_dirpath_sz << 2, 0 },
171 };
172
173
174 static struct rpc_version mnt_version1 = {
175 1, 2, mnt_procedures
176 };
177
178 static struct rpc_version mnt_version3 = {
179 3, 2, mnt3_procedures
180 };
181
182 static struct rpc_version * mnt_version[] = {
183 NULL,
184 &mnt_version1,
185 NULL,
186 &mnt_version3,
187 };
188
189 static struct rpc_stat mnt_stats;
190
191 struct rpc_program mnt_program = {
192 "mount",
193 NFS_MNT_PROGRAM,
194 sizeof(mnt_version)/sizeof(mnt_version[0]),
195 mnt_version,
196 &mnt_stats,
197 };
198
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