linux-kernel - Re: [PATCH v9 3/8] block: Add bdev atomic write limits helpers

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Message-ID: <20241016195829.GO21853@frogsfrogsfrogs>
Date: Wed, 16 Oct 2024 12:58:29 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: John Garry <john.g.garry@...cle.com>
Cc: axboe@...nel.dk, brauner@...nel.org, viro@...iv.linux.org.uk,
	jack@...e.cz, dchinner@...hat.com, hch@....de, cem@...nel.org,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	hare@...e.de, martin.petersen@...cle.com,
	catherine.hoang@...cle.com, mcgrof@...nel.org,
	ritesh.list@...il.com, ojaswin@...ux.ibm.com
Subject: Re: [PATCH v9 3/8] block: Add bdev atomic write limits helpers

On Wed, Oct 16, 2024 at 10:03:20AM +0000, John Garry wrote:
> Add helpers to get atomic write limits for a bdev, so that we don't access
> request_queue helpers outside the block layer.
> 
> We check if the bdev can actually atomic write in these helpers, so we
> can avoid users missing using this check.
> 
> Suggested-by: Christoph Hellwig <hch@....de>
> Signed-off-by: John Garry <john.g.garry@...cle.com>

Looks good,
Reviewed-by: Darrick J. Wong <djwong@...nel.org>

--D

> ---
>  include/linux/blkdev.h | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 50c3b959da28..c2cc3c146d74 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -1674,6 +1674,22 @@ static inline bool bdev_can_atomic_write(struct block_device *bdev)
>  	return true;
>  }
>  
> +static inline unsigned int
> +bdev_atomic_write_unit_min_bytes(struct block_device *bdev)
> +{
> +	if (!bdev_can_atomic_write(bdev))
> +		return 0;
> +	return queue_atomic_write_unit_min_bytes(bdev_get_queue(bdev));
> +}
> +
> +static inline unsigned int
> +bdev_atomic_write_unit_max_bytes(struct block_device *bdev)
> +{
> +	if (!bdev_can_atomic_write(bdev))
> +		return 0;
> +	return queue_atomic_write_unit_max_bytes(bdev_get_queue(bdev));
> +}
> +
>  #define DEFINE_IO_COMP_BATCH(name)	struct io_comp_batch name = { }
>  
>  #endif /* _LINUX_BLKDEV_H */
> -- 
> 2.31.1
> 
>