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

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Date: Thu, 21 Dec 2023 13:56:04 +0000
From: John Garry <john.g.garry@...cle.com>
To: Christoph Hellwig <hch@....de>
Cc: "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 21/12/2023 13:22, Christoph Hellwig wrote:
> 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,

For sure

> which suggest we
> want to export is as a field. 

ok

> Network file systems also might have
> their own limits for one reason or another.

Understood