Index: uspace/srv/fs/tmpfs/Makefile
===================================================================
--- uspace/srv/fs/tmpfs/Makefile	(revision d5cdffe4fde8970a6f5de3be190ff0111f06612b)
+++ uspace/srv/fs/tmpfs/Makefile	(revision d5cdffe4fde8970a6f5de3be190ff0111f06612b)
@@ -0,0 +1,76 @@
+#
+# Copyright (c) 2006 Martin Decky
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# - Redistributions of source code must retain the above copyright
+#   notice, this list of conditions and the following disclaimer.
+# - Redistributions in binary form must reproduce the above copyright
+#   notice, this list of conditions and the following disclaimer in the
+#   documentation and/or other materials provided with the distribution.
+# - The name of the author may not be used to endorse or promote products
+#   derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+
+## Setup toolchain
+#
+
+LIBC_PREFIX = ../../../lib/libc
+LIBFS_PREFIX = ../../../lib/libfs
+SOFTINT_PREFIX = ../../../lib/softint
+include $(LIBC_PREFIX)/Makefile.toolchain
+
+CFLAGS += -I $(LIBFS_PREFIX)
+
+LIBS = $(LIBC_PREFIX)/libc.a $(LIBFS_PREFIX)/libfs.a
+
+## Sources
+#
+
+OUTPUT = tmpfs
+SOURCES = \
+	tmpfs.c \
+	tmpfs_ops.c
+
+OBJECTS := $(addsuffix .o,$(basename $(SOURCES)))
+
+.PHONY: all clean depend disasm
+
+all: $(OUTPUT) disasm
+
+-include Makefile.depend
+
+clean:
+	-rm -f $(OUTPUT) $(OUTPUT).map $(OUTPUT).disasm Makefile.depend
+
+depend:
+	$(CC) $(DEFS) $(CFLAGS) -M $(SOURCES) > Makefile.depend
+
+$(OUTPUT): $(OBJECTS) $(LIBS)
+	$(LD) -T $(LIBC_PREFIX)/arch/$(ARCH)/_link.ld $(OBJECTS) $(LIBS) $(LFLAGS) -o $@ -Map $(OUTPUT).map
+
+disasm:
+	$(OBJDUMP) -d $(OUTPUT) >$(OUTPUT).disasm
+
+%.o: %.S
+	$(CC) $(DEFS) $(AFLAGS) $(CFLAGS) -D__ASM__ -c $< -o $@
+
+%.o: %.s
+	$(AS) $(AFLAGS) $< -o $@
+
+%.o: %.c
+	$(CC) $(DEFS) $(CFLAGS) -c $< -o $@
Index: uspace/srv/fs/tmpfs/tmpfs.c
===================================================================
--- uspace/srv/fs/tmpfs/tmpfs.c	(revision d5cdffe4fde8970a6f5de3be190ff0111f06612b)
+++ uspace/srv/fs/tmpfs/tmpfs.c	(revision d5cdffe4fde8970a6f5de3be190ff0111f06612b)
@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 2006 Martin Decky
+ * Copyright (c) 2007 Jakub Jermar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup fs
+ * @{
+ */ 
+
+/**
+ * @file	tmpfs.c
+ * @brief	File system driver for in-memory file system.
+ *
+ * Every instance of tmpfs exists purely in memory and has neither a disk layout
+ * nor any permanent storage (e.g. disk blocks). With each system reboot, data
+ * stored in a tmpfs file system is lost.
+ */
+
+#include "tmpfs.h"
+#include <ipc/ipc.h>
+#include <ipc/services.h>
+#include <async.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <libfs.h>
+#include "../../vfs/vfs.h"
+
+
+vfs_info_t tmpfs_vfs_info = {
+	.name = "tmpfs",
+	.ops = {
+		[IPC_METHOD_TO_VFS_OP(VFS_REGISTER)] = VFS_OP_DEFINED,
+		[IPC_METHOD_TO_VFS_OP(VFS_MOUNT)] = VFS_OP_DEFINED,
+		[IPC_METHOD_TO_VFS_OP(VFS_UNMOUNT)] = VFS_OP_DEFINED,
+		[IPC_METHOD_TO_VFS_OP(VFS_LOOKUP)] = VFS_OP_DEFINED,
+		[IPC_METHOD_TO_VFS_OP(VFS_OPEN)] = VFS_OP_DEFINED,
+		[IPC_METHOD_TO_VFS_OP(VFS_CREATE)] = VFS_OP_DEFINED,
+		[IPC_METHOD_TO_VFS_OP(VFS_CLOSE)] = VFS_OP_DEFINED,
+		[IPC_METHOD_TO_VFS_OP(VFS_READ)] = VFS_OP_DEFINED,
+		[IPC_METHOD_TO_VFS_OP(VFS_WRITE)] = VFS_OP_DEFINED,
+		[IPC_METHOD_TO_VFS_OP(VFS_SEEK)] = VFS_OP_DEFAULT
+	}
+};
+
+fs_reg_t tmpfs_reg;
+
+/**
+ * This connection fibril processes VFS requests from VFS.
+ *
+ * In order to support simultaneous VFS requests, our design is as follows.
+ * The connection fibril accepts VFS requests from VFS. If there is only one
+ * instance of the fibril, VFS will need to serialize all VFS requests it sends
+ * to FAT. To overcome this bottleneck, VFS can send TMPFS the
+ * IPC_M_CONNECT_ME_TO call. In that case, a new connection fibril will be
+ * created, which in turn will accept the call. Thus, a new phone will be
+ * opened for VFS.
+ *
+ * There are few issues with this arrangement. First, VFS can run out of
+ * available phones. In that case, VFS can close some other phones or use one
+ * phone for more serialized requests. Similarily, TMPFS can refuse to duplicate
+ * the connection. VFS should then just make use of already existing phones and
+ * route its requests through them. To avoid paying the fibril creation price 
+ * upon each request, TMPFS might want to keep the connections open after the
+ * request has been completed.
+ */
+static void tmpfs_connection(ipc_callid_t iid, ipc_call_t *icall)
+{
+	if (iid) {
+		/*
+		 * This only happens for connections opened by
+		 * IPC_M_CONNECT_ME_TO calls as opposed to callback connections
+		 * created by IPC_M_CONNECT_TO_ME.
+		 */
+		ipc_answer_0(iid, EOK);
+	}
+	
+	dprintf("VFS-TMPFS connection established.\n");
+	while (1) {
+		ipc_callid_t callid;
+		ipc_call_t call;
+	
+		callid = async_get_call(&call);
+		switch  (IPC_GET_METHOD(call)) {
+		case VFS_REGISTER:
+			ipc_answer_0(callid, EOK);
+			break;
+		case VFS_LOOKUP:
+			tmpfs_lookup(callid, &call);
+			break;
+		default:
+			ipc_answer_0(callid, ENOTSUP);
+			break;
+		}
+	}
+}
+
+int main(int argc, char **argv)
+{
+	int vfs_phone;
+
+	printf("TMPFS: HelenOS TMPFS file system server.\n");
+
+	vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0);
+	while (vfs_phone < EOK) {
+		usleep(10000);
+		vfs_phone = ipc_connect_me_to(PHONE_NS, SERVICE_VFS, 0, 0);
+	}
+	
+	int rc;
+	rc = fs_register(vfs_phone, &tmpfs_reg, &tmpfs_vfs_info,
+	    tmpfs_connection);
+	if (rc != EOK) {
+		printf("Failed to register the TMPFS file system (%d)\n", rc);
+		return rc;
+	}
+	
+	dprintf("TMPFS filesystem registered, fs_handle=%d.\n",
+	    tmpfs_reg.fs_handle);
+
+	async_manager();
+	/* not reached */
+	return 0;
+}
+
+/**
+ * @}
+ */ 
Index: uspace/srv/fs/tmpfs/tmpfs.h
===================================================================
--- uspace/srv/fs/tmpfs/tmpfs.h	(revision d5cdffe4fde8970a6f5de3be190ff0111f06612b)
+++ uspace/srv/fs/tmpfs/tmpfs.h	(revision d5cdffe4fde8970a6f5de3be190ff0111f06612b)
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2007 Jakub Jermar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup fs
+ * @{
+ */ 
+
+#ifndef TMPFS_TMPFS_H_
+#define TMPFS_TMPFS_H_
+
+#include <ipc/ipc.h>
+#include <libfs.h>
+#include <atomic.h>
+#include <sys/types.h>
+#include <bool.h>
+
+#define dprintf(...)	printf(__VA_ARGS__)
+
+typedef struct tmpfs_dentry {
+	struct tmpfs_dentry *parent;
+	struct tmpfs_dentry *sibling;
+	struct tmpfs_dentry *child;
+	char *name;
+} tmpfs_dentry_t;
+
+extern fs_reg_t tmpfs_reg;
+
+extern void tmpfs_lookup(ipc_callid_t, ipc_call_t *);
+
+#endif
+
+/**
+ * @}
+ */
Index: uspace/srv/fs/tmpfs/tmpfs_ops.c
===================================================================
--- uspace/srv/fs/tmpfs/tmpfs_ops.c	(revision d5cdffe4fde8970a6f5de3be190ff0111f06612b)
+++ uspace/srv/fs/tmpfs/tmpfs_ops.c	(revision d5cdffe4fde8970a6f5de3be190ff0111f06612b)
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2007 Jakub Jermar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup fs
+ * @{
+ */ 
+
+/**
+ * @file	tmpfs_ops.c
+ * @brief	Implementation of VFS operations for the TMPFS file system
+ *		server.
+ */
+
+#include "tmpfs.h"
+#include "../../vfs/vfs.h"
+#include <ipc/ipc.h>
+#include <async.h>
+#include <errno.h>
+
+#define PLB_GET_CHAR(i)		(tmpfs_reg.plb_ro[(i) % PLB_SIZE])
+
+/** Compare one component of path to a directory entry.
+ *
+ * @param dentry	Directory entry to compare the path component with.
+ * @param start		Index into PLB where the path component starts.
+ * @param last		Index of the last character of the path in PLB.
+ *
+ * @return		Zero on failure or delta such that (index + delta) %
+ *			PLB_SIZE points	to a new path component in PLB.
+ */
+static unsigned match_path_component(tmpfs_dentry_t *dentry, unsigned start,
+    unsigned last)
+{
+	return 0;
+}
+
+void tmpfs_lookup(ipc_callid_t rid, ipc_call_t *request)
+{
+	int first = IPC_GET_ARG1(*request);
+	int second = IPC_GET_ARG2(*request);
+	int dev_handle = IPC_GET_ARG3(*request);
+
+	
+}
+
+/**
+ * @}
+ */