linux-kernel - Re: [PATCH 10/21] block: Add fops atomic write support

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Message-ID: <yq1lecktuoo.fsf@ca-mkp.ca.oracle.com>
Date:   Mon, 02 Oct 2023 20:48:06 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Bart Van Assche <bvanassche@....org>
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,
        chandan.babu@...cle.com, dchinner@...hat.com,
        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-api@...r.kernel.org
Subject: Re: [PATCH 10/21] block: Add fops atomic write support


Bart,

> Are there any SCSI devices that we care about that report an ATOMIC
> TRANSFER LENGTH GRANULARITY that is larger than a single logical
> block?

Yes.

Note that code path used inside a storage device to guarantee atomicity
of an entire I/O may be substantially different from the code path which
only offers an incremental guarantee at a single logical or physical
block level (to the extent that those guarantees are offered at all but
that's a different kettle of fish).

> I'm wondering whether we really have to support such devices.

Yes.

-- 
Martin K. Petersen	Oracle Linux Engineering