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/xprt.h>
18 #include <linux/sunrpc/sched.h>
19 #include <linux/nfs_fs.h>
22 # define NFSDBG_FACILITY NFSDBG_ROOT
26 #define MOUNT_PROGRAM 100005
27 #define MOUNT_VERSION 1
32 static struct rpc_clnt * mnt_create(char *, struct sockaddr_in *,
34 static struct rpc_program mnt_program;
42 * Obtain an NFS file handle for the given host and path
45 nfsroot_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh,
46 int version, int protocol)
48 struct rpc_clnt *mnt_clnt;
49 struct mnt_fhstatus result = {
56 dprintk("NFS: nfs_mount(%08x:%s)\n",
57 (unsigned)ntohl(addr->sin_addr.s_addr), path);
59 sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(addr->sin_addr.s_addr));
60 mnt_clnt = mnt_create(hostname, addr, version, protocol);
62 return PTR_ERR(mnt_clnt);
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);
69 static struct rpc_clnt *
70 mnt_create(char *hostname, struct sockaddr_in *srvaddr, int version,
73 struct rpc_xprt *xprt;
74 struct rpc_clnt *clnt;
76 xprt = xprt_create_proto(protocol, srvaddr, NULL);
78 return (struct rpc_clnt *)xprt;
80 clnt = rpc_create_client(xprt, hostname,
81 &mnt_program, version,
84 clnt->cl_softrtry = 1;
92 * XDR encode/decode functions for MOUNT
95 xdr_encode_dirpath(struct rpc_rqst *req, u32 *p, const char *path)
97 p = xdr_encode_string(p, path);
99 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
104 xdr_decode_fhstatus(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res)
106 struct nfs_fh *fh = res->fh;
108 if ((res->status = ntohl(*p++)) == 0) {
109 fh->size = NFS2_FHSIZE;
110 memcpy(fh->data, p, NFS2_FHSIZE);
116 xdr_decode_fhstatus3(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res)
118 struct nfs_fh *fh = res->fh;
120 if ((res->status = ntohl(*p++)) == 0) {
121 int size = ntohl(*p++);
122 if (size <= NFS3_FHSIZE) {
124 memcpy(fh->data, p, size);
126 res->status = -EBADHANDLE;
131 #define MNT_dirpath_sz (1 + 256)
132 #define MNT_fhstatus_sz (1 + 8)
134 static struct rpc_procinfo mnt_procedures[] = {
136 .p_proc = MNTPROC_MNT,
137 .p_encode = (kxdrproc_t) xdr_encode_dirpath,
138 .p_decode = (kxdrproc_t) xdr_decode_fhstatus,
139 .p_bufsiz = MNT_dirpath_sz << 2,
143 static struct rpc_procinfo mnt3_procedures[] = {
145 .p_proc = MOUNTPROC3_MNT,
146 .p_encode = (kxdrproc_t) xdr_encode_dirpath,
147 .p_decode = (kxdrproc_t) xdr_decode_fhstatus3,
148 .p_bufsiz = MNT_dirpath_sz << 2,
153 static struct rpc_version mnt_version1 = {
156 .procs = mnt_procedures
159 static struct rpc_version mnt_version3 = {
162 .procs = mnt3_procedures
165 static struct rpc_version * mnt_version[] = {
172 static struct rpc_stat mnt_stats;
174 static struct rpc_program mnt_program = {
176 .number = NFS_MNT_PROGRAM,
177 .nrvers = ARRAY_SIZE(mnt_version),
178 .version = mnt_version,