linux-kernel - Re: [PATCH 08/13] xfs: Do not free EOF blocks for forcealign

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Date: Fri, 21 Jun 2024 12:08:42 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: John Garry <john.g.garry@...cle.com>
Cc: chandan.babu@...cle.com, dchinner@...hat.com, hch@....de,
	viro@...iv.linux.org.uk, brauner@...nel.org, jack@...e.cz,
	linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, catherine.hoang@...cle.com,
	martin.petersen@...cle.com
Subject: Re: [PATCH 08/13] xfs: Do not free EOF blocks for forcealign

On Fri, Jun 21, 2024 at 10:05:35AM +0000, John Garry wrote:
> For when forcealign is enabled, we want the EOF to be aligned as well, so
> do not free EOF blocks.
> 
> Signed-off-by: John Garry <john.g.garry@...cle.com>
> ---
>  fs/xfs/xfs_bmap_util.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
> index e5d893f93522..56b80a7c0992 100644
> --- a/fs/xfs/xfs_bmap_util.c
> +++ b/fs/xfs/xfs_bmap_util.c
> @@ -539,8 +539,13 @@ xfs_can_free_eofblocks(
>  	 * forever.
>  	 */
>  	end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip));
> -	if (xfs_inode_has_bigrtalloc(ip))
> +
> +	/* Do not free blocks when forcing extent sizes */

"Only try to free blocks beyond the allocation unit that crosses EOF" ?

Otherwise seems fine to me
Reviewed-by: Darrick J. Wong <djwong@...nel.org>

--D

> +	if (xfs_inode_has_forcealign(ip))
> +		end_fsb = roundup_64(end_fsb, ip->i_extsize);
> +	else if (xfs_inode_has_bigrtalloc(ip))
>  		end_fsb = xfs_rtb_roundup_rtx(mp, end_fsb);
> +
>  	last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
>  	if (last_fsb <= end_fsb)
>  		return false;
> -- 
> 2.31.1
> 
>