You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: api_op_DisassociateFileSystem.go
    path of file: ./repos/aws-sdk-go-v2/service/storagegateway
    
    the code of the file until where you have to start completion: // Code generated by smithy-go-codegen DO NOT EDIT.

package storagegateway

import (
	"context"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Disassociates an Amazon FSx file system from the specified gateway. After the
// disassociation process finishes, the gateway can no longer access the Amazon FSx
// file system. This operation is only supported in the FSx File Gateway type.
func (c *Client) DisassociateFileSystem(ctx context.Context, params *DisassociateFileSystemInput, optFns ...func(*Options)) (*DisassociateFileSystemOutput, error) {
	if params == nil {
		params = &DisassociateFileSystemInput{}
	}

	result, metadata, err := c.invokeOperation(ctx, "DisassociateFileSystem", params, optFns, c.addOperationDisassociateFileSystemMiddlewares)
	if err != nil {
		return nil, err
	}

	out := result.(*DisassociateFileSystemOutput)
	out.ResultMetadata = metadata
	return out, nil
}

type DisassociateFileSystemInput struct {

	// The Amazon Resource Name (ARN) of the file system association to be deleted.
	//
	// This member is required.
	FileSystemAssociationARN *string

	// If this value is set to true, the operation disassociates an Amazon FSx file
	// system immediately. It ends all data uploads to the file system, and the file
	// system association enters the FORCE_DELETING status. If this value is set to
	// false, the Amazon FSx file system does not disassociate until all data is
	// uploaded.
	ForceDelete bool

	noSmithyDocu
    
func (c *Client) addOperationDisassociateFileSystemMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpDisassociateFileSystem{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpDisassociateFileSystem{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "DisassociateFileSystem"); err != nil {
		return fmt.Errorf("add protocol finalizers: %v", err)
	}

	if err = addlegacyEndpointContextSetter(stack, options); err != nil {
		return err
	}
	if err = addSetLoggerMiddleware(stack, options); err != nil {
		return err
	}
	if err = addClientRequestID(stack); err != nil {
		return err
	}
	if err = addComputeContentLength(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = addComputePayloadSHA256(stack); err != nil {
		return err
	}
	if err = addRetry(stack, options); err != nil {
		return err
	}
	if err = addRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = addRecordResponseTiming(stack); err != nil {
		return err
	}
	if err = addClientUserAgent(stack, options); err != nil {
		return err
	}
	if err = smithyhttp.AddErrorCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = addSetLegacyContextSigningOptionsMiddleware(stack); err != nil {
		return err
	}
	if err = addOpDisassociateFileSystemValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opDisassociateFileSystem(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = addRecursionDetection(stack); err != nil {
		return err
	}
	if err = addRequestIDRetrieverMiddleware(stack); err != nil {
		return err
	}
	if err = addResponseErrorMiddleware(stack); err != nil {
		return err
	}
	if err = addRequestResponseLogging(stack, options); err != nil {
		return err
	}
	if err = addDisableHTTPSMiddleware(stack, options); err != nil {
		return err
	}
	return nil
}