From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 2/3] block: introduce REQ_FLUSH flag
Date: Sun, 27 Jun 2010 05:52:24 -0400
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To: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: axboe@kernel.dk, James.Bottomley@HansenPartnership.com, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org

> +++ b/include/linux/bio.h
> @@ -152,6 +152,7 @@ enum rq_flag_bits {
>  	__REQ_SYNC,		/* request is sync (sync write or read) */
>  	__REQ_META,		/* metadata io request */
>  	__REQ_DISCARD,		/* request to discard sectors */
> +	__REQ_FLUSH,		/* request for cache flush */

As we only used this in the request it should go into the struct request
only section at the end of the flags.