linux-kernel - Re: [PATCH v5 0/5] RAID 0/1/10 atomic write support

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Message-ID: <yq1jzd0rolu.fsf@ca-mkp.ca.oracle.com>
Date: Mon, 18 Nov 2024 20:37:22 -0500
From: "Martin K. Petersen" <martin.petersen@...cle.com>
To: John Garry <john.g.garry@...cle.com>
Cc: axboe@...nel.dk, song@...nel.org, yukuai3@...wei.com, hch@....de,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-raid@...r.kernel.org, martin.petersen@...cle.com
Subject: Re: [PATCH v5 0/5] RAID 0/1/10 atomic write support


John,

> This series introduces atomic write support for software RAID 0/1/10.
>
> The main changes are to ensure that we can calculate the stacked
> device request_queue limits appropriately for atomic writes.
> Fundamentally, if some bottom does not support atomic writes, then
> atomic writes are not supported for the top device. Furthermore, the
> atomic writes limits are the lowest common supported limits from all
> bottom devices.
>
> Flag BLK_FEAT_ATOMIC_WRITES_STACKED is introduced to enable atomic
> writes for stacked devices selectively. This ensures that we can
> analyze and test atomic writes support per individual md/dm
> personality (prior to enabling).

LGTM.

Reviewed-by: Martin K. Petersen <martin.petersen@...cle.com>

-- 
Martin K. Petersen	Oracle Linux Engineering