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