linux-kernel - Re: [PATCH 2/4] block: use the same failfast bits for bio and request

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Date:	Thu, 9 Jul 2009 09:37:46 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Boaz Harrosh <bharrosh@...asas.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Niel Lambrechts <niel.lambrechts@...il.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH 2/4] block: use the same failfast bits for bio and
	request

On Thu, Jul 09, 2009 at 09:45:24AM +0900, Tejun Heo wrote:
> What's more disturbing to me is the different between RQ and BIO
> flags.  __REQ_* are bit positions, REQ_* are masks while BIO_* are bit
> positions.  Sadly it seems it's already too late to change that.  I
> personally an not a big fan of simple accessors or flags defined as
> bit positions.  They seem to obscure things without much benefit.

flags as bit positions generally only make sense if you use
test/set/clear_bit, otherwise they just confuse things.  And the
accessors are pretty annoying, especially in the block layer.  Trying to
find the places where a BIO flag has an actual effect is pretty painful
due to the mix of the different flags and the accessors.
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