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