[WIP] Partial bot skeleton, non-functional though

vendor/github.com/cockroachdb/pebble/vfs/fadvise_linux.go

@@ -0,0 +1,20 @@
+// Copyright 2019 The LevelDB-Go and Pebble Authors. All rights reserved. Use
+// of this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+
+//go:build linux
+// +build linux
+
+package vfs
+
+import "golang.org/x/sys/unix"
+
+// Calls Fadvise with FADV_RANDOM to disable readahead on a file descriptor.
+func fadviseRandom(f uintptr) error {
+	return unix.Fadvise(int(f), 0, 0, unix.FADV_RANDOM)
+}
+
+// Calls Fadvise with FADV_SEQUENTIAL to enable readahead on a file descriptor.
+func fadviseSequential(f uintptr) error {
+	return unix.Fadvise(int(f), 0, 0, unix.FADV_SEQUENTIAL)
+}