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/*
* linux/fs/nfs/mount_clnt.c
*
* MOUNT client to support NFSroot.
*
* Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/uio.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/xprt.h>
#include <linux/sunrpc/sched.h>
#include <linux/nfs_fs.h>
#ifdef RPC_DEBUG
# define NFSDBG_FACILITY NFSDBG_ROOT
#endif
/*
#define MOUNT_PROGRAM 100005
#define MOUNT_VERSION 1
#define MOUNT_MNT 1
#define MOUNT_UMNT 3
*/
static struct rpc_clnt * mnt_create(char *, struct sockaddr_in *,
int, int);
static struct rpc_program mnt_program;
struct mnt_fhstatus {
unsigned int status;
struct nfs_fh * fh;
};
/*
* Obtain an NFS file handle for the given host and path
*/
int
nfsroot_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh,
int version, int protocol)
{
struct rpc_clnt *mnt_clnt;
struct mnt_fhstatus result = {
.fh = fh
};
char hostname[32];
int status;
int call;
dprintk("NFS: nfs_mount(%08x:%s)\n",
(unsigned)ntohl(addr->sin_addr.s_addr), path);
sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(addr->sin_addr.s_addr));
mnt_clnt = mnt_create(hostname, addr, version, protocol);
if (IS_ERR(mnt_clnt))
return PTR_ERR(mnt_clnt);
call = (version == NFS_MNT3_VERSION) ? MOUNTPROC3_MNT : MNTPROC_MNT;
status = rpc_call(mnt_clnt, call, path, &result, 0);
return status < 0? status : (result.status? -EACCES : 0);
}
static struct rpc_clnt *
mnt_create(char *hostname, struct sockaddr_in *srvaddr, int version,
int protocol)
{
struct rpc_xprt *xprt;
struct rpc_clnt *clnt;
xprt = xprt_create_proto(protocol, srvaddr, NULL);
if (IS_ERR(xprt))
return (struct rpc_clnt *)xprt;
clnt = rpc_create_client(xprt, hostname,
&mnt_program, version,
RPC_AUTH_UNIX);
if (!IS_ERR(clnt)) {
clnt->cl_softrtry = 1;
clnt->cl_oneshot = 1;
clnt->cl_intr = 1;
}
return clnt;
}
/*
* XDR encode/decode functions for MOUNT
*/
static int
xdr_encode_dirpath(struct rpc_rqst *req, u32 *p, const char *path)
{
p = xdr_encode_string(p, path);
req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
return 0;
}
static int
xdr_decode_fhstatus(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res)
{
struct nfs_fh *fh = res->fh;
if ((res->status = ntohl(*p++)) == 0) {
fh->size = NFS2_FHSIZE;
memcpy(fh->data, p, NFS2_FHSIZE);
}
return 0;
}
static int
xdr_decode_fhstatus3(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res)
{
struct nfs_fh *fh = res->fh;
if ((res->status = ntohl(*p++)) == 0) {
int size = ntohl(*p++);
if (size <= NFS3_FHSIZE) {
fh->size = size;
memcpy(fh->data, p, size);
} else
res->status = -EBADHANDLE;
}
return 0;
}
#define MNT_dirpath_sz (1 + 256)
#define MNT_fhstatus_sz (1 + 8)
static struct rpc_procinfo mnt_procedures[] = {
[MNTPROC_MNT] = {
.p_proc = MNTPROC_MNT,
.p_encode = (kxdrproc_t) xdr_encode_dirpath,
.p_decode = (kxdrproc_t) xdr_decode_fhstatus,
.p_bufsiz = MNT_dirpath_sz << 2,
},
};
static struct rpc_procinfo mnt3_procedures[] = {
[MOUNTPROC3_MNT] = {
.p_proc = MOUNTPROC3_MNT,
.p_encode = (kxdrproc_t) xdr_encode_dirpath,
.p_decode = (kxdrproc_t) xdr_decode_fhstatus3,
.p_bufsiz = MNT_dirpath_sz << 2,
},
};
static struct rpc_version mnt_version1 = {
.number = 1,
.nrprocs = 2,
.procs = mnt_procedures
};
static struct rpc_version mnt_version3 = {
.number = 3,
.nrprocs = 2,
.procs = mnt3_procedures
};
static struct rpc_version * mnt_version[] = {
NULL,
&mnt_version1,
NULL,
&mnt_version3,
};
static struct rpc_stat mnt_stats;
static struct rpc_program mnt_program = {
.name = "mount",
.number = NFS_MNT_PROGRAM,
.nrvers = ARRAY_SIZE(mnt_version),
.version = mnt_version,
.stats = &mnt_stats,
};
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