linux-kernel - Re: [PATCH v8 05/15] xfs: ignore HW which cannot atomic write a single block

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Message-ID: <20250423083317.GB30432@lst.de>
Date: Wed, 23 Apr 2025 10:33:17 +0200
From: Christoph Hellwig <hch@....de>
To: John Garry <john.g.garry@...cle.com>
Cc: Christoph Hellwig <hch@....de>, "Darrick J. Wong" <djwong@...nel.org>,
	brauner@...nel.org, viro@...iv.linux.org.uk, jack@...e.cz,
	cem@...nel.org, linux-fsdevel@...r.kernel.org, dchinner@...hat.com,
	linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	ojaswin@...ux.ibm.com, ritesh.list@...il.com,
	martin.petersen@...cle.com, linux-ext4@...r.kernel.org,
	linux-block@...r.kernel.org, catherine.hoang@...cle.com,
	linux-api@...r.kernel.org
Subject: Re: [PATCH v8 05/15] xfs: ignore HW which cannot atomic write a
 single block

On Wed, Apr 23, 2025 at 09:28:14AM +0100, John Garry wrote:
>> But maybe we should just delay setting the atomic values until later so
>> that it can be done in a single pass?  E.g. into xfs_setsize_buftarg
>> which then should probably be rename to something like
>> xfs_buftarg_setup.
>>
>
> How about just do away with btp->bt_bdev_awu_{min, max} struct members, and 
> call bdev_atomic_write_unit_max(mp->m_ddev_targp->bt_bdev) [and same for 
> RT] to later to set the mp awu max values at mountfs time? I think that 
> would work..

Sounds reasonable.