Re: [PATCH 30/43] xfs: hide reserved RT blocks from statfs

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On Wed, Dec 11, 2024 at 09:54:55AM +0100, Christoph Hellwig wrote:
> File systems with a zoned RT device have a large number of reserved
> blocks that are required for garbage collection, and which can't be
> filled with user data.  Exclude them from the available blocks reported
> through stat(v)fs.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
>  fs/xfs/xfs_super.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> index b289b2ba78b1..59998aac7ed7 100644
> --- a/fs/xfs/xfs_super.c
> +++ b/fs/xfs/xfs_super.c
> @@ -865,7 +865,8 @@ xfs_statfs_rt(
>  		xfs_sum_freecounter(mp, XC_FREE_RTEXTENTS);
>  
>  	st->f_bfree = xfs_rtbxlen_to_blen(mp, max(0LL, freertx));
> -	st->f_blocks = mp->m_sb.sb_rblocks;
> +	st->f_blocks = mp->m_sb.sb_rblocks -
> +		xfs_rtbxlen_to_blen(mp, mp->m_resblks[XC_FREE_RTEXTENTS].total);

I wonder, is mp->m_resblks[XC_FREE_RTEXTENTS].total considered
"unavailable"?  Should that be added to xfs_freecounter_unavailable?

--D

>  }
>  
>  static void
> -- 
> 2.45.2
> 
> 




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