linux-kernel - Re: [PATCH v3 07/15] block: Limit atomic write IO size according to atomic_write_max

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Date: Wed, 14 Feb 2024 08:26:10 +0100
From: Christoph Hellwig <hch@....de>
To: John Garry <john.g.garry@...cle.com>
Cc: Christoph Hellwig <hch@....de>, axboe@...nel.dk, kbusch@...nel.org,
	sagi@...mberg.me, jejb@...ux.ibm.com, martin.petersen@...cle.com,
	djwong@...nel.org, viro@...iv.linux.org.uk, brauner@...nel.org,
	dchinner@...hat.com, jack@...e.cz, 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-scsi@...r.kernel.org,
	ming.lei@...hat.com, ojaswin@...ux.ibm.com, bvanassche@....org
Subject: Re: [PATCH v3 07/15] block: Limit atomic write IO size according
 to atomic_write_max_sectors

On Tue, Feb 13, 2024 at 08:15:08AM +0000, John Garry wrote:
> I'm note sure if that would be better in the fops.c patch (or not added)

We'll need the partition check.  If you want to get fancy you could
also add the atomic boundary offset thing there as a partitions would
make devices with that "feature" useful again, although I'd prefer to
only deal with that if the need actually arises.

The right place is in the core infrastructure, the bdev patch is just
a user of the block infrastructure.  bdev really are just another
file system and a consumer of the block layer APIs.