linux-kernel - Re: [PATCH v2 01/16] block: Add atomic write operations to request

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Message-ID: <yq1cyv9flkw.fsf@ca-mkp.ca.oracle.com>
Date:   Wed, 13 Dec 2023 23:38:10 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     John Garry <john.g.garry@...cle.com>, axboe@...nel.dk,
        kbusch@...nel.org, hch@....de, sagi@...mberg.me,
        jejb@...ux.ibm.com, martin.petersen@...cle.com, djwong@...nel.org,
        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,
        jaswin@...ux.ibm.com, bvanassche@....org,
        Himanshu Madhani <himanshu.madhani@...cle.com>
Subject: Re: [PATCH v2 01/16] block: Add atomic write operations to
 request_queue limits


Ming,

> Relying on driver to provide sound value is absolutely bad design from
> API viewpoint.

All the other queue_limits are validated by the LLDs. It's challenging
to lift that validation to the block layer since the values reported are
heavily protocol-dependent and thus information is lost if we do it
somewhere else.

-- 
Martin K. Petersen	Oracle Linux Engineering