linux-kernel - Re: [PATCH 2/5] block: add function to issue compare and write

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Message-ID: <yq1egu62rnm.fsf@sermon.lab.mkp.net>
Date:	Fri, 17 Oct 2014 19:38:37 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	michaelc@...wisc.edu, linux-scsi@...r.kernel.org,
	target-devel@...r.kernel.org, ceph-devel@...r.kernel.org,
	axboe@...nel.dk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] block: add function to issue compare and write

>>>>> "Christoph" == Christoph Hellwig <hch@...radead.org> writes:

Christoph> We already have req->cmd_type which actually is a fairly good
Christoph> description of what we get except for REQ_TYPE_FS, which is a
Christoph> horrible overload using req->cmd_flags.

Christoph> Given that you're just one of many currently ongoing patches
Christoph> to add more flags here I think you need to byte the bullet
Christoph> and fix this up by replacing REQ_TYPE_FS with:

Christoph> REQ_TYPE_WRITE REQ_TYPE_READ REQ_TYPE_FLUSH REQ_TYPE_DISCARD
Christoph> REQ_TYPE_WRITE_SAME REQ_TYPE_CMP_AND_WRITE

The problem with this is that, as it stands, a bio has no type. And it
would suck if we couldn't keep bio rw and request flags in sync.

I wonder if it would make more sense to move the remaining rq types to
cmd_flags after I'm done with the 64-bit conversion?

-- 
Martin K. Petersen	Oracle Linux Engineering
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