linux-kernel - Re: [PATCH v4 09/11] xfs: expose block size in stat

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Date: Fri, 26 Apr 2024 08:15:42 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
Cc: willy@...radead.org, brauner@...nel.org, david@...morbit.com,
	chandan.babu@...cle.com, akpm@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org, hare@...e.de,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-xfs@...r.kernel.org, mcgrof@...nel.org, gost.dev@...sung.com,
	p.raghav@...sung.com
Subject: Re: [PATCH v4 09/11] xfs: expose block size in stat

On Thu, Apr 25, 2024 at 01:37:44PM +0200, Pankaj Raghav (Samsung) wrote:
> From: Pankaj Raghav <p.raghav@...sung.com>
> 
> For block size larger than page size, the unit of efficient IO is
> the block size, not the page size. Leaving stat() to report
> PAGE_SIZE as the block size causes test programs like fsx to issue
> illegal ranges for operations that require block size alignment
> (e.g. fallocate() insert range). Hence update the preferred IO size
> to reflect the block size in this case.
> 
> This change is based on a patch originally from Dave Chinner.[1]
> 
> [1] https://lwn.net/ml/linux-fsdevel/20181107063127.3902-16-david@fromorbit.com/
> 
> Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>

Seems reasonable to me...
Reviewed-by: Darrick J. Wong <djwong@...nel.org>

--D

> ---
>  fs/xfs/xfs_iops.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
> index 66f8c47642e8..77b198a33aa1 100644
> --- a/fs/xfs/xfs_iops.c
> +++ b/fs/xfs/xfs_iops.c
> @@ -543,7 +543,7 @@ xfs_stat_blksize(
>  			return 1U << mp->m_allocsize_log;
>  	}
>  
> -	return PAGE_SIZE;
> +	return max_t(uint32_t, PAGE_SIZE, mp->m_sb.sb_blocksize);
>  }
>  
>  STATIC int
> -- 
> 2.34.1
> 
>