linux-kernel - Re: [PATCH 0/6] block atomic writes for XFS

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Date: Fri, 9 Feb 2024 12:44:59 +0530
From: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To: John Garry <john.g.garry@...cle.com>
Cc: hch@....de, djwong@...nel.org, viro@...iv.linux.org.uk, brauner@...nel.org,
        dchinner@...hat.com, jack@...e.cz, chandan.babu@...cle.com,
        martin.petersen@...cle.com, linux-kernel@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        tytso@....edu, jbongio@...gle.com
Subject: Re: [PATCH 0/6] block atomic writes for XFS

On Wed, Jan 24, 2024 at 02:26:39PM +0000, John Garry wrote:
> This series expands atomic write support to filesystems, specifically
> XFS. Since XFS rtvol supports extent alignment already, support will
> initially be added there. When XFS forcealign feature is merged, then we
> can similarly support atomic writes for a non-rtvol filesystem.

Hi John,

Along with rtvol check, we can also have a simple check to see if the 
FS blocksize itself is big enough to satisfy the atomic requirements.
For eg on machines with 64K page, we can have say 16k or 64k block sizes
which should be able to provide required allocation behavior for atomic
writes. In such cases we don't need rtvol.

Regards,
ojaswin