linux-kernel - Re: [PATCH v3 5/5] block: use chunk_sectors when evaluating stacked atomic write limits

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Message-ID: <yq1qzy8x5m8.fsf@ca-mkp.ca.oracle.com>
Date: Mon, 21 Jul 2025 23:43:32 -0400
From: "Martin K. Petersen" <martin.petersen@...cle.com>
To: John Garry <john.g.garry@...cle.com>
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>,
        Mikulas Patocka
 <mpatocka@...hat.com>, <axboe@...nel.dk>,
        <agk@...hat.com>, <snitzer@...nel.org>, <song@...nel.org>,
        <yukuai3@...wei.com>, <hch@....de>, <nilay@...ux.ibm.com>,
        <dm-devel@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
        <linux-raid@...r.kernel.org>, <linux-block@...r.kernel.org>,
        <ojaswin@...ux.ibm.com>
Subject: Re: [PATCH v3 5/5] block: use chunk_sectors when evaluating stacked
 atomic write limits


John,

> Does pbs need to be a power-of-2?

For ATA and SCSI, definitely. NVMe could technically report a multiple
of the logical block size but I've never come across anything that
didn't report a power of two.

-- 
Martin K. Petersen