diff --git a/vendor/go.etcd.io/etcd/pkg/ioutil/pagewriter.go b/vendor/go.etcd.io/etcd/pkg/ioutil/pagewriter.go
new file mode 100644
index 0000000..72de159
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/pkg/ioutil/pagewriter.go
@@ -0,0 +1,106 @@
+// Copyright 2016 The etcd Authors
+//
+// 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.
+
+package ioutil
+
+import (
+	"io"
+)
+
+var defaultBufferBytes = 128 * 1024
+
+// PageWriter implements the io.Writer interface so that writes will
+// either be in page chunks or from flushing.
+type PageWriter struct {
+	w io.Writer
+	// pageOffset tracks the page offset of the base of the buffer
+	pageOffset int
+	// pageBytes is the number of bytes per page
+	pageBytes int
+	// bufferedBytes counts the number of bytes pending for write in the buffer
+	bufferedBytes int
+	// buf holds the write buffer
+	buf []byte
+	// bufWatermarkBytes is the number of bytes the buffer can hold before it needs
+	// to be flushed. It is less than len(buf) so there is space for slack writes
+	// to bring the writer to page alignment.
+	bufWatermarkBytes int
+}
+
+// NewPageWriter creates a new PageWriter. pageBytes is the number of bytes
+// to write per page. pageOffset is the starting offset of io.Writer.
+func NewPageWriter(w io.Writer, pageBytes, pageOffset int) *PageWriter {
+	return &PageWriter{
+		w:                 w,
+		pageOffset:        pageOffset,
+		pageBytes:         pageBytes,
+		buf:               make([]byte, defaultBufferBytes+pageBytes),
+		bufWatermarkBytes: defaultBufferBytes,
+	}
+}
+
+func (pw *PageWriter) Write(p []byte) (n int, err error) {
+	if len(p)+pw.bufferedBytes <= pw.bufWatermarkBytes {
+		// no overflow
+		copy(pw.buf[pw.bufferedBytes:], p)
+		pw.bufferedBytes += len(p)
+		return len(p), nil
+	}
+	// complete the slack page in the buffer if unaligned
+	slack := pw.pageBytes - ((pw.pageOffset + pw.bufferedBytes) % pw.pageBytes)
+	if slack != pw.pageBytes {
+		partial := slack > len(p)
+		if partial {
+			// not enough data to complete the slack page
+			slack = len(p)
+		}
+		// special case: writing to slack page in buffer
+		copy(pw.buf[pw.bufferedBytes:], p[:slack])
+		pw.bufferedBytes += slack
+		n = slack
+		p = p[slack:]
+		if partial {
+			// avoid forcing an unaligned flush
+			return n, nil
+		}
+	}
+	// buffer contents are now page-aligned; clear out
+	if err = pw.Flush(); err != nil {
+		return n, err
+	}
+	// directly write all complete pages without copying
+	if len(p) > pw.pageBytes {
+		pages := len(p) / pw.pageBytes
+		c, werr := pw.w.Write(p[:pages*pw.pageBytes])
+		n += c
+		if werr != nil {
+			return n, werr
+		}
+		p = p[pages*pw.pageBytes:]
+	}
+	// write remaining tail to buffer
+	c, werr := pw.Write(p)
+	n += c
+	return n, werr
+}
+
+func (pw *PageWriter) Flush() error {
+	if pw.bufferedBytes == 0 {
+		return nil
+	}
+	_, err := pw.w.Write(pw.buf[:pw.bufferedBytes])
+	pw.pageOffset = (pw.pageOffset + pw.bufferedBytes) % pw.pageBytes
+	pw.bufferedBytes = 0
+	return err
+}
diff --git a/vendor/go.etcd.io/etcd/pkg/ioutil/readcloser.go b/vendor/go.etcd.io/etcd/pkg/ioutil/readcloser.go
new file mode 100644
index 0000000..d3efcfe
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/pkg/ioutil/readcloser.go
@@ -0,0 +1,66 @@
+// Copyright 2015 The etcd Authors
+//
+// 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.
+
+package ioutil
+
+import (
+	"fmt"
+	"io"
+)
+
+// ReaderAndCloser implements io.ReadCloser interface by combining
+// reader and closer together.
+type ReaderAndCloser struct {
+	io.Reader
+	io.Closer
+}
+
+var (
+	ErrShortRead = fmt.Errorf("ioutil: short read")
+	ErrExpectEOF = fmt.Errorf("ioutil: expect EOF")
+)
+
+// NewExactReadCloser returns a ReadCloser that returns errors if the underlying
+// reader does not read back exactly the requested number of bytes.
+func NewExactReadCloser(rc io.ReadCloser, totalBytes int64) io.ReadCloser {
+	return &exactReadCloser{rc: rc, totalBytes: totalBytes}
+}
+
+type exactReadCloser struct {
+	rc         io.ReadCloser
+	br         int64
+	totalBytes int64
+}
+
+func (e *exactReadCloser) Read(p []byte) (int, error) {
+	n, err := e.rc.Read(p)
+	e.br += int64(n)
+	if e.br > e.totalBytes {
+		return 0, ErrExpectEOF
+	}
+	if e.br < e.totalBytes && n == 0 {
+		return 0, ErrShortRead
+	}
+	return n, err
+}
+
+func (e *exactReadCloser) Close() error {
+	if err := e.rc.Close(); err != nil {
+		return err
+	}
+	if e.br < e.totalBytes {
+		return ErrShortRead
+	}
+	return nil
+}
diff --git a/vendor/go.etcd.io/etcd/pkg/ioutil/reader.go b/vendor/go.etcd.io/etcd/pkg/ioutil/reader.go
new file mode 100644
index 0000000..0703ed4
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/pkg/ioutil/reader.go
@@ -0,0 +1,40 @@
+// Copyright 2015 The etcd Authors
+//
+// 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.
+
+// Package ioutil implements I/O utility functions.
+package ioutil
+
+import "io"
+
+// NewLimitedBufferReader returns a reader that reads from the given reader
+// but limits the amount of data returned to at most n bytes.
+func NewLimitedBufferReader(r io.Reader, n int) io.Reader {
+	return &limitedBufferReader{
+		r: r,
+		n: n,
+	}
+}
+
+type limitedBufferReader struct {
+	r io.Reader
+	n int
+}
+
+func (r *limitedBufferReader) Read(p []byte) (n int, err error) {
+	np := p
+	if len(np) > r.n {
+		np = np[:r.n]
+	}
+	return r.r.Read(np)
+}
diff --git a/vendor/go.etcd.io/etcd/pkg/ioutil/util.go b/vendor/go.etcd.io/etcd/pkg/ioutil/util.go
new file mode 100644
index 0000000..6a6746e
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/pkg/ioutil/util.go
@@ -0,0 +1,43 @@
+// Copyright 2015 The etcd Authors
+//
+// 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.
+
+package ioutil
+
+import (
+	"io"
+	"os"
+
+	"go.etcd.io/etcd/pkg/fileutil"
+)
+
+// WriteAndSyncFile behaves just like ioutil.WriteFile in the standard library,
+// but calls Sync before closing the file. WriteAndSyncFile guarantees the data
+// is synced if there is no error returned.
+func WriteAndSyncFile(filename string, data []byte, perm os.FileMode) error {
+	f, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
+	if err != nil {
+		return err
+	}
+	n, err := f.Write(data)
+	if err == nil && n < len(data) {
+		err = io.ErrShortWrite
+	}
+	if err == nil {
+		err = fileutil.Fsync(f)
+	}
+	if err1 := f.Close(); err == nil {
+		err = err1
+	}
+	return err
+}