@@ -17,7 +17,7 @@ type execBackend interface {

 	ContainerExecCreate(name string, options *container.ExecOptions) (string, error)

 	ContainerExecInspect(id string) (*backend.ExecInspect, error)

 	ContainerExecResize(name string, height, width int) error

-	ContainerExecStart(ctx context.Context, name string, options container.ExecStartOptions) error

+	ContainerExecStart(ctx context.Context, name string, options backend.ExecStartConfig) error

 	ExecExists(name string) (bool, error)

 }

@@ -10,6 +10,7 @@ import (

 	"github.com/containerd/log"

 	"github.com/docker/docker/api/server/httputils"

 	"github.com/docker/docker/api/types"

+	"github.com/docker/docker/api/types/backend"

 	"github.com/docker/docker/api/types/container"

 	"github.com/docker/docker/api/types/versions"

 	"github.com/docker/docker/errdefs"

@@ -137,7 +138,7 @@ func (s *containerRouter) postContainerExecStart(ctx context.Context, w http.Res

 	// Now run the user process in container.

 	//

 	// TODO: Maybe we should we pass ctx here if we're not detaching?

-	err := s.backend.ContainerExecStart(context.Background(), execName, container.ExecStartOptions{

+	err := s.backend.ContainerExecStart(context.Background(), execName, backend.ExecStartConfig{

 		Stdin:       stdin,

 		Stdout:      stdout,

 		Stderr:      stderr,

@@ -92,6 +92,14 @@ type ContainerStatsConfig struct {

 	OutStream func() io.Writer

 }

+// ExecStartConfig holds the options to start container's exec.

+type ExecStartConfig struct {

+	Stdin       io.Reader

+	Stdout      io.Writer

+	Stderr      io.Writer

+	ConsoleSize *[2]uint `json:",omitempty"`

+}

+

 // ExecInspect holds information about a running process started

 // with docker exec.

 type ExecInspect struct {

@@ -1,7 +1,6 @@

 package container // import "github.com/docker/docker/api/types/container"

 import (

-	"io"

 	"time"

 	"github.com/docker/docker/api/types/strslice"

@@ -36,14 +35,6 @@ type StopOptions struct {

 // HealthConfig holds configuration settings for the HEALTHCHECK feature.

 type HealthConfig = dockerspec.HealthcheckConfig

-// ExecStartOptions holds the options to start container's exec.

-type ExecStartOptions struct {

-	Stdin       io.Reader

-	Stdout      io.Writer

-	Stderr      io.Writer

-	ConsoleSize *[2]uint `json:",omitempty"`

-}

-

 // Config contains the configuration data about a container.

 // It should hold only portable information about the container.

 // Here, "portable" means "independent from the host we are running on".

@@ -11,6 +11,7 @@ import (

 	"github.com/containerd/containerd"

 	"github.com/containerd/log"

+	"github.com/docker/docker/api/types/backend"

 	containertypes "github.com/docker/docker/api/types/container"

 	"github.com/docker/docker/api/types/events"

 	"github.com/docker/docker/api/types/strslice"

@@ -147,7 +148,7 @@ func (daemon *Daemon) ContainerExecCreate(name string, options *containertypes.E

 // ContainerExecStart starts a previously set up exec instance. The

 // std streams are set up.

 // If ctx is cancelled, the process is terminated.

-func (daemon *Daemon) ContainerExecStart(ctx context.Context, name string, options containertypes.ExecStartOptions) (err error) {

+func (daemon *Daemon) ContainerExecStart(ctx context.Context, name string, options backend.ExecStartConfig) (err error) {

 	var (

 		cStdin           io.ReadCloser

 		cStdout, cStderr io.Writer

@@ -11,7 +11,7 @@ import (

 	"github.com/containerd/log"

 	"github.com/docker/docker/api/types"

-	containertypes "github.com/docker/docker/api/types/container"

+	"github.com/docker/docker/api/types/backend"

 	"github.com/docker/docker/api/types/events"

 	"github.com/docker/docker/api/types/strslice"

 	"github.com/docker/docker/container"

@@ -97,7 +97,7 @@ func (p *cmdProbe) run(ctx context.Context, d *Daemon, cntr *container.Container

 	defer cancelProbe()

 	execErr := make(chan error, 1)

-	options := containertypes.ExecStartOptions{

+	options := backend.ExecStartConfig{

 		Stdout: output,

 		Stderr: output,

 	}