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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);

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 = { 0, 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));

        if (!(mnt_clnt = mnt_create(hostname, addr, version, protocol)))

                return -EACCES;

        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;

        if (!(xprt = xprt_create_proto(protocol, 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)

{

        struct nfs_fh *fh = res->fh;

        memset((void *)fh, 0, sizeof(*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;

        memset((void *)fh, 0, sizeof(*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[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,

};