linux-kernel - Re: [PATCH v2 00/16] block atomic writes

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Message-ID: <20231221132236.GB26817@lst.de>
Date: Thu, 21 Dec 2023 14:22:36 +0100
From: Christoph Hellwig <hch@....de>
To: John Garry <john.g.garry@...cle.com>
Cc: Christoph Hellwig <hch@....de>, "Darrick J. Wong" <djwong@...nel.org>,
	axboe@...nel.dk, kbusch@...nel.org, sagi@...mberg.me,
	jejb@...ux.ibm.com, martin.petersen@...cle.com,
	viro@...iv.linux.org.uk, brauner@...nel.org, dchinner@...hat.com,
	jack@...e.cz, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
	linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	tytso@....edu, jbongio@...gle.com, linux-scsi@...r.kernel.org,
	ming.lei@...hat.com, jaswin@...ux.ibm.com, bvanassche@....org
Subject: Re: [PATCH v2 00/16] block atomic writes

On Thu, Dec 21, 2023 at 01:18:33PM +0000, John Garry wrote:
>> For SGL-capable devices that would be
>> BIO_MAX_VECS, otherwise 1.
>
> ok, but we would need to advertise that or whatever segment limit. A statx 
> field just for that seems a bit inefficient in terms of space.

I'd rather not hard code BIO_MAX_VECS in the ABI, which suggest we
want to export is as a field.  Network file systems also might have
their own limits for one reason or another.