linux-kernel - Re: [PATCH] block: remove unused REQ_TYPE_LINUX

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Date:	Mon, 05 Jul 2010 14:43:22 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	axboe@...nel.dk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: remove unused REQ_TYPE_LINUX_BLOCK

On 07/05/2010 05:11 AM, FUJITA Tomonori wrote:
> You prefer to keep this for future possible users?
>
> This can be applied to block's for-2.6.36.
>
> =
> From: FUJITA Tomonori<fujita.tomonori@....ntt.co.jp>
> Subject: [PATCH] block: remove unused REQ_TYPE_LINUX_BLOCK
>
> Nobody uses REQ_TYPE_LINUX_BLOCK (and its REQ_LB_OP_*).
>
> Signed-off-by: FUJITA Tomonori<fujita.tomonori@....ntt.co.jp>
> ---
>   include/linux/blkdev.h |   15 ---------------
>   1 files changed, 0 insertions(+), 15 deletions(-)
>
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 3a2c5d9..baf5258 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -60,7 +60,6 @@ enum rq_cmd_type_bits {
>   	REQ_TYPE_PM_RESUME,		/* resume request */
>   	REQ_TYPE_PM_SHUTDOWN,		/* shutdown request */
>   	REQ_TYPE_SPECIAL,		/* driver defined type */
> -	REQ_TYPE_LINUX_BLOCK,		/* generic block layer message */
>   	/*
>   	 * for ATA/ATAPI devices. this really doesn't belong here, ide should
>   	 * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver
> @@ -70,20 +69,6 @@ enum rq_cmd_type_bits {
>   	REQ_TYPE_ATA_PC,
>   };
>
> -/*
> - * For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being
> - * sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a
> - * SCSI cdb.
> - *
> - * 0x00 ->  0x3f are driver private, to be used for whatever purpose they need,
> - * typically to differentiate REQ_TYPE_SPECIAL requests.
> - *
> - */
> -enum {
> -	REQ_LB_OP_EJECT	= 0x40,		/* eject request */
> -	REQ_LB_OP_FLUSH = 0x41,		/* flush request */
> -};

Acked-by: Jeff Garzik <jgarzik@...hat.com>

Having a second level of opcodes, under REQ_TYPE_LINUX_BLOCK, always 
seems less desirable than the current course of action you are now 
pursuing (REQ_FLUSH, etc.)...   nice cleanup.

	Jeff




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