linux-kernel - Re: [RFC v2 11/14] xfs: expose block size in stat

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Date: Tue, 13 Feb 2024 08:27:04 -0800
From: "Darrick J. Wong" <djwong@...nel.org>
To: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
Cc: linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	mcgrof@...nel.org, gost.dev@...sung.com, akpm@...ux-foundation.org,
	kbusch@...nel.org, chandan.babu@...cle.com, p.raghav@...sung.com,
	linux-kernel@...r.kernel.org, hare@...e.de, willy@...radead.org,
	linux-mm@...ck.org, david@...morbit.com,
	Dave Chinner <dchinner@...hat.com>
Subject: Re: [RFC v2 11/14] xfs: expose block size in stat

On Tue, Feb 13, 2024 at 10:37:10AM +0100, Pankaj Raghav (Samsung) wrote:
> From: Dave Chinner <dchinner@...hat.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.
> 
> Signed-off-by: Dave Chinner <dchinner@...hat.com>
> [mcgrof: forward rebase in consideration for commit
> dd2d535e3fb29d ("xfs: cleanup calculating the stat optimal I/O size")]
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> ---
>  fs/xfs/xfs_iops.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
> index a0d77f5f512e..8791a9d80897 100644
> --- a/fs/xfs/xfs_iops.c
> +++ b/fs/xfs/xfs_iops.c
> @@ -515,6 +515,8 @@ xfs_stat_blksize(
>  	struct xfs_inode	*ip)
>  {
>  	struct xfs_mount	*mp = ip->i_mount;
> +	unsigned long	default_size = max_t(unsigned long, PAGE_SIZE,
> +					     mp->m_sb.sb_blocksize);

Nit: wonky indentation, but...

>  
>  	/*
>  	 * If the file blocks are being allocated from a realtime volume, then
> @@ -543,7 +545,7 @@ xfs_stat_blksize(
>  			return 1U << mp->m_allocsize_log;
>  	}
>  
> -	return PAGE_SIZE;
> +	return default_size;

..why not return max_t(...) directly here?

--D

>  }
>  
>  STATIC int
> -- 
> 2.43.0
> 
>