2 * linux/fs/nfs/mount_clnt.c
4 * MOUNT client to support NFSroot.
6 * Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de>
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>
16 #include <linux/sunrpc/clnt.h>
17 #include <linux/sunrpc/sched.h>
18 #include <linux/nfs_fs.h>
21 # define NFSDBG_FACILITY NFSDBG_ROOT
25 #define MOUNT_PROGRAM 100005
26 #define MOUNT_VERSION 1
31 static struct rpc_clnt * mnt_create(char *, struct sockaddr_in *,
33 static struct rpc_program mnt_program;
41 * Obtain an NFS file handle for the given host and path
44 nfsroot_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh,
45 int version, int protocol)
47 struct rpc_clnt *mnt_clnt;
48 struct mnt_fhstatus result = {
51 struct rpc_message msg = {
58 dprintk("NFS: nfs_mount(%08x:%s)\n",
59 (unsigned)ntohl(addr->sin_addr.s_addr), path);
61 sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(addr->sin_addr.s_addr));
62 mnt_clnt = mnt_create(hostname, addr, version, protocol);
64 return PTR_ERR(mnt_clnt);
66 if (version == NFS_MNT3_VERSION)
67 msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT];
69 msg.rpc_proc = &mnt_clnt->cl_procinfo[MNTPROC_MNT];
71 status = rpc_call_sync(mnt_clnt, &msg, 0);
72 return status < 0? status : (result.status? -EACCES : 0);
75 static struct rpc_clnt *
76 mnt_create(char *hostname, struct sockaddr_in *srvaddr, int version,
79 struct rpc_create_args args = {
81 .address = (struct sockaddr *)srvaddr,
82 .addrsize = sizeof(*srvaddr),
83 .servername = hostname,
84 .program = &mnt_program,
86 .authflavor = RPC_AUTH_UNIX,
87 .flags = (RPC_CLNT_CREATE_ONESHOT |
88 RPC_CLNT_CREATE_INTR),
91 return rpc_create(&args);
95 * XDR encode/decode functions for MOUNT
98 xdr_encode_dirpath(struct rpc_rqst *req, __be32 *p, const char *path)
100 p = xdr_encode_string(p, path);
102 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
107 xdr_decode_fhstatus(struct rpc_rqst *req, __be32 *p, struct mnt_fhstatus *res)
109 struct nfs_fh *fh = res->fh;
111 if ((res->status = ntohl(*p++)) == 0) {
112 fh->size = NFS2_FHSIZE;
113 memcpy(fh->data, p, NFS2_FHSIZE);
119 xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p, struct mnt_fhstatus *res)
121 struct nfs_fh *fh = res->fh;
123 if ((res->status = ntohl(*p++)) == 0) {
124 int size = ntohl(*p++);
125 if (size <= NFS3_FHSIZE) {
127 memcpy(fh->data, p, size);
129 res->status = -EBADHANDLE;
134 #define MNT_dirpath_sz (1 + 256)
135 #define MNT_fhstatus_sz (1 + 8)
136 #define MNT_fhstatus3_sz (1 + 16)
138 static struct rpc_procinfo mnt_procedures[] = {
140 .p_proc = MNTPROC_MNT,
141 .p_encode = (kxdrproc_t) xdr_encode_dirpath,
142 .p_decode = (kxdrproc_t) xdr_decode_fhstatus,
143 .p_arglen = MNT_dirpath_sz,
144 .p_replen = MNT_fhstatus_sz,
145 .p_statidx = MNTPROC_MNT,
150 static struct rpc_procinfo mnt3_procedures[] = {
152 .p_proc = MOUNTPROC3_MNT,
153 .p_encode = (kxdrproc_t) xdr_encode_dirpath,
154 .p_decode = (kxdrproc_t) xdr_decode_fhstatus3,
155 .p_arglen = MNT_dirpath_sz,
156 .p_replen = MNT_fhstatus3_sz,
157 .p_statidx = MOUNTPROC3_MNT,
163 static struct rpc_version mnt_version1 = {
166 .procs = mnt_procedures
169 static struct rpc_version mnt_version3 = {
172 .procs = mnt3_procedures
175 static struct rpc_version * mnt_version[] = {
182 static struct rpc_stat mnt_stats;
184 static struct rpc_program mnt_program = {
186 .number = NFS_MNT_PROGRAM,
187 .nrvers = ARRAY_SIZE(mnt_version),
188 .version = mnt_version,