Allow kernels loaded by pxeboot, which was compiled with LOADER_TFTP_SUPPORT,

to stll be able to mount NFS root as prescribed by DCHP configuration. Since
pxeboot is using TFTP to get to the files, pxeboot can not rely on NFS to
provide it a root directory hande as a side effect. pxeboot has to  make RPC
mount call itself.

1 files changed, 24 insertions, 0 deletions

diff --git a/sys/boot/i386/libi386/pxe.c b/sys/boot/i386/libi386/pxe.c
index b78508a..a0f66a7 100644
--- a/sys/boot/i386/libi386/pxe.c
+++ b/sys/boot/i386/libi386/pxe.c
@@ -413,6 +413,22 @@ struct nfs_iodesc {
 	/* structure truncated here */
 };
 extern struct	nfs_iodesc nfs_root_node;
+extern int      rpc_port;
+
+static void
+pxe_rpcmountcall()
+{
+	struct	iodesc *d;
+	int     error;
+
+	if (!(d = socktodesc(pxe_sock)))
+		return;
+        d->myport = htons(--rpc_port);
+        d->destip = rootip;
+	if ((error = nfs_getrootfh(d, rootpath, nfs_root_node.fh)) != 0) 
+		printf("NFS MOUNT RPC error: %d\n", error);
+	nfs_root_node.iodesc = d;
+}
 
 static void
 pxe_setnfshandle(char *rootpath)
@@ -421,6 +437,14 @@ pxe_setnfshandle(char *rootpath)
 	u_char	*fh;
 	char	buf[2 * NFS_FHSIZE + 3], *cp;
 
+	/*
+	 * If NFS files were never opened, we need to do mount call
+	 * ourselves. Use nfs_root_node.iodesc as flag indicating
+	 * previous NFS usage.
+	 */
+	if (nfs_root_node.iodesc == NULL)
+		pxe_rpcmountcall();
+
 	fh = &nfs_root_node.fh[0];
 	buf[0] = 'X';
 	cp = &buf[1];