linux-kernel - Re: [PATCH 01/21] block: Add atomic write operations to request

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Message-ID: <yq1bkdfrt8l.fsf@ca-mkp.ca.oracle.com>
Date:   Tue, 03 Oct 2023 23:00:55 -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,
        Himanshu Madhani <himanshu.madhani@...cle.com>
Subject: Re: [PATCH 01/21] block: Add atomic write operations to
 request_queue limits


Bart,

>   also that there are no guarantees that the data written by an atomic
>   write will survive a power failure. See also the difference between
>   the NVMe parameters AWUN and AWUPF.

We only care about *PF. The *N variants were cut from the same cloth as
TRIM and UNMAP.

-- 
Martin K. Petersen	Oracle Linux Engineering