diff --git a/media/mtp/AsyncIO.cpp b/media/mtp/AsyncIO.cpp
new file mode 100644
index 0000000..a1a98ab
--- /dev/null
+++ b/media/mtp/AsyncIO.cpp
@@ -0,0 +1,176 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <android-base/logging.h>
+#include <condition_variable>
+#include <memory>
+#include <mutex>
+#include <queue>
+
+#include "AsyncIO.h"
+
+namespace {
+
+void read_func(struct aiocb *aiocbp) {
+    aiocbp->ret = TEMP_FAILURE_RETRY(pread(aiocbp->aio_fildes,
+                aiocbp->aio_buf, aiocbp->aio_nbytes, aiocbp->aio_offset));
+    if (aiocbp->ret == -1) aiocbp->error = errno;
+}
+
+void write_func(struct aiocb *aiocbp) {
+    aiocbp->ret = TEMP_FAILURE_RETRY(pwrite(aiocbp->aio_fildes,
+                aiocbp->aio_buf, aiocbp->aio_nbytes, aiocbp->aio_offset));
+    if (aiocbp->ret == -1) aiocbp->error = errno;
+}
+
+void splice_read_func(struct aiocb *aiocbp) {
+    aiocbp->ret = TEMP_FAILURE_RETRY(splice(aiocbp->aio_fildes,
+                (off64_t*) &aiocbp->aio_offset, aiocbp->aio_sink,
+                NULL, aiocbp->aio_nbytes, 0));
+    if (aiocbp->ret == -1) aiocbp->error = errno;
+}
+
+void splice_write_func(struct aiocb *aiocbp) {
+    aiocbp->ret = TEMP_FAILURE_RETRY(splice(aiocbp->aio_fildes, NULL,
+                aiocbp->aio_sink, (off64_t*) &aiocbp->aio_offset,
+                aiocbp->aio_nbytes, 0));
+    if (aiocbp->ret == -1) aiocbp->error = errno;
+}
+
+std::queue<std::unique_ptr<struct aiocb>> queue;
+std::mutex queue_lock;
+std::condition_variable queue_cond;
+std::condition_variable write_cond;
+int done = 1;
+void splice_write_pool_func(int) {
+    while(1) {
+        std::unique_lock<std::mutex> lk(queue_lock);
+        queue_cond.wait(lk, []{return !queue.empty() || done;});
+        if (queue.empty() && done) {
+            return;
+        }
+        std::unique_ptr<struct aiocb> aiocbp = std::move(queue.front());
+        queue.pop();
+        lk.unlock();
+        write_cond.notify_one();
+        splice_write_func(aiocbp.get());
+        close(aiocbp->aio_fildes);
+    }
+}
+
+void write_pool_func(int) {
+    while(1) {
+        std::unique_lock<std::mutex> lk(queue_lock);
+        queue_cond.wait(lk, []{return !queue.empty() || done;});
+        if (queue.empty() && done) {
+            return;
+        }
+        std::unique_ptr<struct aiocb> aiocbp = std::move(queue.front());
+        queue.pop();
+        lk.unlock();
+        write_cond.notify_one();
+        aiocbp->ret = TEMP_FAILURE_RETRY(pwrite(aiocbp->aio_fildes,
+                    aiocbp->aio_pool_buf.get(), aiocbp->aio_nbytes, aiocbp->aio_offset));
+        if (aiocbp->ret == -1) aiocbp->error = errno;
+    }
+}
+
+constexpr int NUM_THREADS = 1;
+constexpr int MAX_QUEUE_SIZE = 10;
+std::thread pool[NUM_THREADS];
+
+} // end anonymous namespace
+
+void aio_pool_init(void(f)(int)) {
+    CHECK(done == 1);
+    done = 0;
+    for (int i = 0; i < NUM_THREADS; i++) {
+        pool[i] = std::thread(f, i);
+    }
+}
+
+void aio_pool_splice_init() {
+    aio_pool_init(splice_write_pool_func);
+}
+
+void aio_pool_write_init() {
+    aio_pool_init(write_pool_func);
+}
+
+void aio_pool_end() {
+    done = 1;
+    for (int i = 0; i < NUM_THREADS; i++) {
+        std::unique_lock<std::mutex> lk(queue_lock);
+        lk.unlock();
+        queue_cond.notify_one();
+    }
+
+    for (int i = 0; i < NUM_THREADS; i++) {
+        pool[i].join();
+    }
+}
+
+// used for both writes and splices depending on which init was used before.
+int aio_pool_write(struct aiocb *aiocbp) {
+    std::unique_lock<std::mutex> lk(queue_lock);
+    write_cond.wait(lk, []{return queue.size() < MAX_QUEUE_SIZE;});
+    queue.push(std::unique_ptr<struct aiocb>(aiocbp));
+    lk.unlock();
+    queue_cond.notify_one();
+    return 0;
+}
+
+int aio_read(struct aiocb *aiocbp) {
+    aiocbp->thread = std::thread(read_func, aiocbp);
+    return 0;
+}
+
+int aio_write(struct aiocb *aiocbp) {
+    aiocbp->thread = std::thread(write_func, aiocbp);
+    return 0;
+}
+
+int aio_splice_read(struct aiocb *aiocbp) {
+    aiocbp->thread = std::thread(splice_read_func, aiocbp);
+    return 0;
+}
+
+int aio_splice_write(struct aiocb *aiocbp) {
+    aiocbp->thread = std::thread(splice_write_func, aiocbp);
+    return 0;
+}
+
+int aio_error(const struct aiocb *aiocbp) {
+    return aiocbp->error;
+}
+
+ssize_t aio_return(struct aiocb *aiocbp) {
+    return aiocbp->ret;
+}
+
+int aio_suspend(struct aiocb *aiocbp[], int n,
+        const struct timespec *) {
+    for (int i = 0; i < n; i++) {
+        aiocbp[i]->thread.join();
+    }
+    return 0;
+}
+
+int aio_cancel(int, struct aiocb *) {
+    // Not implemented
+    return -1;
+}
+