From 0ecbe891b5147c6be1e3e432f26c02970358c2f7 Mon Sep 17 00:00:00 2001
From: Blake Mizerany <blake.mizerany@gmail.com>
Date: Tue, 12 Aug 2014 17:48:07 -0700
Subject: [PATCH] remove pkg/btrfs

---
 pkg/btrfs/btrfs_linux.go | 74 ----------------------------------------
 pkg/btrfs/btrfs_stubs.go | 17 ---------
 pkg/btrfs/btrfs_test.go  | 31 -----------------
 3 files changed, 122 deletions(-)
 delete mode 100644 pkg/btrfs/btrfs_linux.go
 delete mode 100644 pkg/btrfs/btrfs_stubs.go
 delete mode 100644 pkg/btrfs/btrfs_test.go

diff --git a/pkg/btrfs/btrfs_linux.go b/pkg/btrfs/btrfs_linux.go
deleted file mode 100644
index f48dd6386..000000000
--- a/pkg/btrfs/btrfs_linux.go
+++ /dev/null
@@ -1,74 +0,0 @@
-// +build linux,amd64
-
-package btrfs
-
-import (
-	"fmt"
-	"os"
-	"runtime"
-	"syscall"
-	"unsafe"
-
-	"github.com/coreos/etcd/log"
-)
-
-const (
-	// from Linux/include/uapi/linux/magic.h
-	BTRFS_SUPER_MAGIC = 0x9123683E
-
-	// from Linux/include/uapi/linux/fs.h
-	FS_NOCOW_FL = 0x00800000
-	FS_IOC_GETFLAGS = 0x80086601
-	FS_IOC_SETFLAGS = 0x40086602
-)
-
-// IsBtrfs checks whether the file is in btrfs
-func IsBtrfs(path string) bool {
-	// btrfs is linux-only filesystem
-	// exit on other platforms
-	if runtime.GOOS != "linux" {
-		return false
-	}
-	var buf syscall.Statfs_t
-	if err := syscall.Statfs(path, &buf); err != nil {
-		log.Warnf("Failed to statfs: %v", err)
-		return false
-	}
-	log.Debugf("The type of path %v is %v", path, buf.Type)
-	if buf.Type != BTRFS_SUPER_MAGIC {
-		return false
-	}
-	log.Infof("The path %v is in btrfs", path)
-	return true
-}
-
-// SetNOCOWFile sets NOCOW flag for file
-func SetNOCOWFile(path string) error {
-	file, err := os.Open(path)
-	if err != nil {
-		return err
-	}
-	defer file.Close()
-
-	fileinfo, err := file.Stat()
-	if err != nil {
-		return err
-	}
-	if fileinfo.IsDir() {
-		return fmt.Errorf("skip directory")
-	}
-	if fileinfo.Size() != 0 {
-		return fmt.Errorf("skip nonempty file")
-	}
-
-	var attr int
-	if _, _, errno := syscall.Syscall(syscall.SYS_IOCTL, file.Fd(), FS_IOC_GETFLAGS, uintptr(unsafe.Pointer(&attr))); errno != 0 {
-		return errno
-	}
-	attr |= FS_NOCOW_FL
-	if _, _, errno := syscall.Syscall(syscall.SYS_IOCTL, file.Fd(), FS_IOC_SETFLAGS, uintptr(unsafe.Pointer(&attr))); errno != 0 {
-		return errno
-	}
-	log.Infof("Set NOCOW to path %v succeeded", path)
-	return nil
-}
diff --git a/pkg/btrfs/btrfs_stubs.go b/pkg/btrfs/btrfs_stubs.go
deleted file mode 100644
index 179474738..000000000
--- a/pkg/btrfs/btrfs_stubs.go
+++ /dev/null
@@ -1,17 +0,0 @@
-// +build !linux !amd64
-
-package btrfs
-
-import (
-	"fmt"
-)
-
-// IsBtrfs checks whether the file is in btrfs
-func IsBtrfs(path string) bool {
-	return false
-}
-
-// SetNOCOWFile sets NOCOW flag for file
-func SetNOCOWFile(path string) error {
-	return fmt.Errorf("unsupported for the platform")
-}
diff --git a/pkg/btrfs/btrfs_test.go b/pkg/btrfs/btrfs_test.go
deleted file mode 100644
index b841aa370..000000000
--- a/pkg/btrfs/btrfs_test.go
+++ /dev/null
@@ -1,31 +0,0 @@
-package btrfs
-
-import (
-	"io/ioutil"
-	"os"
-	"os/exec"
-	"strings"
-	"testing"
-)
-
-func TestSetNOCOW(t *testing.T) {
-	f, err := ioutil.TempFile(".", "etcdtest")
-	if err != nil {
-		t.Fatal("Failed creating temp dir")
-	}
-	name := f.Name()
-	f.Close()
-	defer os.Remove(name)
-
-	if IsBtrfs(name) {
-		SetNOCOWFile(name)
-		cmd := exec.Command("lsattr", name)
-		out, err := cmd.Output()
-		if err != nil {
-			t.Fatal("Failed executing lsattr")
-		}
-		if !strings.Contains(string(out), "---------------C") {
-			t.Fatal("Failed setting NOCOW:\n", string(out))
-		}
-	}
-}