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