1 files changed, 183 insertions, 0 deletions

diff --git a/fs/nfs/mount_clnt.c b/fs/nfs/mount_clnt.c
new file mode 100644
index 000000000000..9d3ddad96d9e
--- /dev/null
+++ b/fs/nfs/mount_clnt.c
@@ -0,0 +1,183 @@
+/*
+ * 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)) {
+                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_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         = sizeof(mnt_version)/sizeof(mnt_version[0]),
+        .version        = mnt_version,
+        .stats          = &mnt_stats,
+};