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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/inet.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 int nfs_gen_mount(struct sockaddr_in *,
char *, struct nfs_fh *, int);
static struct rpc_clnt * mnt_create(char *, struct sockaddr_in *, int);
extern 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
nfs_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh)
{
return nfs_gen_mount(addr, path, fh, NFS_MNT_VERSION);
}
int
nfs3_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh)
{
return nfs_gen_mount(addr, path, fh, NFS_MNT3_VERSION);
}
static int
nfs_gen_mount(struct sockaddr_in *addr, char *path, struct nfs_fh *fh, int version)
{
struct rpc_clnt *mnt_clnt;
struct mnt_fhstatus result = { 0, fh };
char hostname[32];
int status;
int call;
dprintk("NFS: nfs_mount(%08x:%s)\n",
(unsigned)ntohl(addr->sin_addr.s_addr), path);
strcpy(hostname, in_ntoa(addr->sin_addr.s_addr));
if (!(mnt_clnt = mnt_create(hostname, addr, version)))
return -EACCES;
call = (version == 3) ? 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)
{
struct rpc_xprt *xprt;
struct rpc_clnt *clnt;
if (!(xprt = xprt_create_proto(IPPROTO_UDP, srvaddr, NULL)))
return NULL;
clnt = rpc_create_client(xprt, hostname,
&mnt_program, version,
RPC_AUTH_NULL);
if (!clnt) {
xprt_destroy(xprt);
} else {
clnt->cl_softrtry = 1;
clnt->cl_chatty = 1;
clnt->cl_oneshot = 1;
clnt->cl_intr = 1;
}
return clnt;
}
/*
* XDR encode/decode functions for MOUNT
*/
static int
xdr_error(struct rpc_rqst *req, u32 *p, void *dummy)
{
return -EIO;
}
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)
{
memset((u8 *)res, 0, sizeof(*res));
if ((res->status = ntohl(*p++)) == 0) {
res->fh->size = NFS2_FHSIZE;
memcpy(res->fh->data, p, NFS2_FHSIZE);
}
return 0;
}
static int
xdr_decode_fhstatus3(struct rpc_rqst *req, u32 *p, struct mnt_fhstatus *res)
{
memset((u8 *)res, 0, sizeof(*res));
if ((res->status = ntohl(*p++)) == 0) {
int size = ntohl(*p++);
if (size <= NFS3_FHSIZE) {
res->fh->size = size;
memcpy(res->fh->data, p, res->fh->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[2] = {
{ "mnt_null",
(kxdrproc_t) xdr_error,
(kxdrproc_t) xdr_error, 0, 0 },
{ "mnt_mount",
(kxdrproc_t) xdr_encode_dirpath,
(kxdrproc_t) xdr_decode_fhstatus,
MNT_dirpath_sz << 2, 0 },
};
static struct rpc_procinfo mnt3_procedures[2] = {
{ "mnt3_null",
(kxdrproc_t) xdr_error,
(kxdrproc_t) xdr_error, 0, 0 },
{ "mnt3_mount",
(kxdrproc_t) xdr_encode_dirpath,
(kxdrproc_t) xdr_decode_fhstatus3,
MNT_dirpath_sz << 2, 0 },
};
static struct rpc_version mnt_version1 = {
1, 2, mnt_procedures
};
static struct rpc_version mnt_version3 = {
3, 2, mnt3_procedures
};
static struct rpc_version * mnt_version[] = {
NULL,
&mnt_version1,
NULL,
&mnt_version3,
};
static struct rpc_stat mnt_stats;
struct rpc_program mnt_program = {
"mount",
NFS_MNT_PROGRAM,
sizeof(mnt_version)/sizeof(mnt_version[0]),
mnt_version,
&mnt_stats,
};
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