[fs] Remove unused Mxio dispatcher

Change-Id: I691502ad0bb1bfe16a907e81d73ba4b608da6730

system/ulib/fs/BUILD.gn

@@ -13,15 +13,15 @@ static_library("fs") {
     "include/fs/block-txn.h",
     "include/fs/dispatcher.h",
     "include/fs/mapped-vmo.h",
-    "include/fs/mxio-dispatcher.h",
     "include/fs/trace.h",
     "include/fs/vfs-client.h",
     "include/fs/vfs-dispatcher.h",
     "include/fs/vfs.h",
     "async-dispatcher.cpp",
     "mapped-vmo.cpp",
-    "mxio-dispatcher.cpp",
     "vfs-dispatcher.cpp",
+    "mapped-vmo.cpp",
+    "vfs.cpp",
     "vfs-mount.cpp",
     "vfs-rpc.cpp",
     "vfs-unmount.cpp",

system/ulib/fs/include/fs/mxio-dispatcher.h

@@ -1,43 +0,0 @@
-// Copyright 2017 The Fuchsia Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#pragma once
-
-#include <stdlib.h>
-#include <stdint.h>
-
-#include <magenta/types.h>
-#include <fbl/unique_ptr.h>
-#include <mxio/dispatcher.h>
-#include <fs/vfs.h>
-
-#include "dispatcher.h"
-
-namespace fs {
-
-// MxioDispatcher wraps the C-based single-threaded mxio dispatcher.
-class MxioDispatcher final : public fs::Dispatcher {
-public:
-    // Creates the dispatcher.
-    // This should eventually be followed by a call to Start() or Run() depending
-    // on which thread the dispatcher should run on.
-    static mx_status_t Create(fbl::unique_ptr<fs::MxioDispatcher>* out);
-
-    // Starts the dispatcher on a new thread.
-    mx_status_t StartThread();
-
-    // Runs the dispatcher on the current thread.
-    void RunOnCurrentThread();
-
-    mx_status_t AddVFSHandler(mx::channel channel, vfs_dispatcher_cb_t cb, void* iostate) override;
-
-private:
-    MxioDispatcher();
-
-    mxio_dispatcher_t* dispatcher_;
-
-    DISALLOW_COPY_ASSIGN_AND_MOVE(MxioDispatcher);
-};
-
-} // namespace fs

system/ulib/fs/mxio-dispatcher.cpp

@@ -1,45 +0,0 @@
-// Copyright 2017 The Fuchsia Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include <stdlib.h>
-#include <stdint.h>
-
-#include <magenta/types.h>
-#include <fbl/alloc_checker.h>
-#include <fbl/unique_ptr.h>
-#include <mxio/dispatcher.h>
-#include <fs/mxio-dispatcher.h>
-#include <fs/vfs.h>
-
-namespace fs {
-
-mx_status_t MxioDispatcher::Create(fbl::unique_ptr<fs::MxioDispatcher>* out) {
-    fbl::AllocChecker ac;
-    fbl::unique_ptr<MxioDispatcher> d(new (&ac) MxioDispatcher());
-    if (!ac.check()) {
-        return MX_ERR_NO_MEMORY;
-    }
-    mx_status_t status = mxio_dispatcher_create(&d->dispatcher_, mxrio_handler);
-    if (status != MX_OK) {
-        return status;
-    }
-    *out = fbl::move(d);
-    return MX_OK;
-}
-
-mx_status_t MxioDispatcher::StartThread() {
-    return mxio_dispatcher_start(dispatcher_, "libfs-mxio-dispatcher");
-}
-
-void MxioDispatcher::RunOnCurrentThread() {
-    mxio_dispatcher_run(dispatcher_);
-}
-
-mx_status_t MxioDispatcher::AddVFSHandler(mx::channel channel, vfs_dispatcher_cb_t cb, void* iostate) {
-    return mxio_dispatcher_add(dispatcher_, channel.release(), (void*) cb, iostate);
-}
-
-MxioDispatcher::MxioDispatcher() {}
-
-} // namespace fs

system/ulib/fs/rules.mk

@@ -11,7 +11,6 @@ MODULE_TYPE := userlib
 MODULE_SRCS += \
     $(LOCAL_DIR)/async-dispatcher.cpp \
     $(LOCAL_DIR)/mapped-vmo.cpp \
-    $(LOCAL_DIR)/mxio-dispatcher.cpp \
     $(LOCAL_DIR)/vfs.cpp \
     $(LOCAL_DIR)/vfs-mount.cpp \
     $(LOCAL_DIR)/vfs-unmount.cpp \