blob: 779d2eb649c57935f8929f02271e48ca03759151 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Chuck Lever19207232007-07-01 12:13:33 -04002 * In-kernel MOUNT protocol client
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/sunrpc/sched.h>
16#include <linux/nfs_fs.h>
17
18#ifdef RPC_DEBUG
Chuck Lever3ea97302007-07-01 12:13:27 -040019# define NFSDBG_FACILITY NFSDBG_MOUNT
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#endif
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022static struct rpc_program mnt_program;
23
24struct mnt_fhstatus {
Chuck Lever19207232007-07-01 12:13:33 -040025 u32 status;
26 struct nfs_fh *fh;
Linus Torvalds1da177e2005-04-16 15:20:36 -070027};
28
Chuck Lever3ea97302007-07-01 12:13:27 -040029/**
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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 */
Chuck Lever3ea97302007-07-01 12:13:27 -040041int nfs_mount(struct sockaddr *addr, size_t len, char *hostname, char *path,
42 int version, int protocol, struct nfs_fh *fh)
Linus Torvalds1da177e2005-04-16 15:20:36 -070043{
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 struct mnt_fhstatus result = {
45 .fh = fh
46 };
Chuck Leverdead28d2006-03-20 13:44:23 -050047 struct rpc_message msg = {
48 .rpc_argp = path,
49 .rpc_resp = &result,
50 };
Chuck Lever3ea97302007-07-01 12:13:27 -040051 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,
Matthew Wilcox150030b2007-12-06 16:24:39 -050059 .flags = 0,
Chuck Lever3ea97302007-07-01 12:13:27 -040060 };
61 struct rpc_clnt *mnt_clnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Chuck Lever3ea97302007-07-01 12:13:27 -040064 dprintk("NFS: sending MNT request for %s:%s\n",
65 (hostname ? hostname : "server"), path);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Chuck Lever3ea97302007-07-01 12:13:27 -040067 mnt_clnt = rpc_create(&args);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 if (IS_ERR(mnt_clnt))
Chuck Lever013a8c12007-07-01 12:13:38 -040069 goto out_clnt_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Chuck Leverdead28d2006-03-20 13:44:23 -050071 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);
Trond Myklebust90c57552007-06-09 19:49:36 -040077 rpc_shutdown_client(mnt_clnt);
Chuck Lever013a8c12007-07-01 12:13:38 -040078
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
87out:
88 return status;
89
90out_clnt_err:
91 status = PTR_ERR(mnt_clnt);
92 dprintk("NFS: failed to create RPC client, status=%d\n", status);
93 goto out;
94
95out_call_err:
96 dprintk("NFS: failed to start MNT request, status=%d\n", status);
97 goto out;
98
99out_mnt_err:
100 dprintk("NFS: MNT server returned result %d\n", result.status);
101 status = -EACCES;
102 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103}
104
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105/*
106 * XDR encode/decode functions for MOUNT
107 */
Chuck Lever19207232007-07-01 12:13:33 -0400108static int xdr_encode_dirpath(struct rpc_rqst *req, __be32 *p,
109 const char *path)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
111 p = xdr_encode_string(p, path);
112
113 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
114 return 0;
115}
116
Chuck Lever19207232007-07-01 12:13:33 -0400117static int xdr_decode_fhstatus(struct rpc_rqst *req, __be32 *p,
118 struct mnt_fhstatus *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119{
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
Chuck Lever19207232007-07-01 12:13:33 -0400129static int xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p,
130 struct mnt_fhstatus *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131{
132 struct nfs_fh *fh = res->fh;
Trond Myklebustb7e24452008-06-19 15:21:11 -0400133 unsigned size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
135 if ((res->status = ntohl(*p++)) == 0) {
Trond Myklebustb7e24452008-06-19 15:21:11 -0400136 size = ntohl(*p++);
137 if (size <= NFS3_FHSIZE && size != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 fh->size = size;
139 memcpy(fh->data, p, size);
140 } else
141 res->status = -EBADHANDLE;
142 }
143 return 0;
144}
145
146#define MNT_dirpath_sz (1 + 256)
147#define MNT_fhstatus_sz (1 + 8)
Chuck Lever2bea90d2007-03-29 16:47:53 -0400148#define MNT_fhstatus3_sz (1 + 16)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
Chuck Lever19207232007-07-01 12:13:33 -0400150static struct rpc_procinfo mnt_procedures[] = {
151 [MNTPROC_MNT] = {
152 .p_proc = MNTPROC_MNT,
153 .p_encode = (kxdrproc_t) xdr_encode_dirpath,
154 .p_decode = (kxdrproc_t) xdr_decode_fhstatus,
155 .p_arglen = MNT_dirpath_sz,
156 .p_replen = MNT_fhstatus_sz,
157 .p_statidx = MNTPROC_MNT,
158 .p_name = "MOUNT",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 },
160};
161
162static struct rpc_procinfo mnt3_procedures[] = {
Chuck Lever19207232007-07-01 12:13:33 -0400163 [MOUNTPROC3_MNT] = {
164 .p_proc = MOUNTPROC3_MNT,
165 .p_encode = (kxdrproc_t) xdr_encode_dirpath,
166 .p_decode = (kxdrproc_t) xdr_decode_fhstatus3,
167 .p_arglen = MNT_dirpath_sz,
168 .p_replen = MNT_fhstatus3_sz,
169 .p_statidx = MOUNTPROC3_MNT,
170 .p_name = "MOUNT",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 },
172};
173
174
Chuck Lever19207232007-07-01 12:13:33 -0400175static struct rpc_version mnt_version1 = {
176 .number = 1,
177 .nrprocs = 2,
178 .procs = mnt_procedures,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179};
180
Chuck Lever19207232007-07-01 12:13:33 -0400181static struct rpc_version mnt_version3 = {
182 .number = 3,
183 .nrprocs = 2,
184 .procs = mnt3_procedures,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185};
186
Chuck Lever19207232007-07-01 12:13:33 -0400187static struct rpc_version *mnt_version[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 NULL,
189 &mnt_version1,
190 NULL,
191 &mnt_version3,
192};
193
Chuck Lever19207232007-07-01 12:13:33 -0400194static struct rpc_stat mnt_stats;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Chuck Lever19207232007-07-01 12:13:33 -0400196static struct rpc_program mnt_program = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 .name = "mount",
198 .number = NFS_MNT_PROGRAM,
Tobias Klausere8c96f82006-03-24 03:15:34 -0800199 .nrvers = ARRAY_SIZE(mnt_version),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 .version = mnt_version,
201 .stats = &mnt_stats,
202};