linux-kernel - Re: [PATCH 09/13] xfs: Update xfs_inode_alloc_unitsize

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Date: Fri, 21 Jun 2024 11:38:24 -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 09/13] xfs: Update xfs_inode_alloc_unitsize_fsb() for
 forcealign

On Fri, Jun 21, 2024 at 10:05:36AM +0000, John Garry wrote:
> For forcealign enabled, the allocation unit size is in ip->i_extsize, and
> this must never be zero.
> 
> Signed-off-by: John Garry <john.g.garry@...cle.com>
> ---
>  fs/xfs/xfs_inode.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
> index 994fb7e184d9..cd07b15478ac 100644
> --- a/fs/xfs/xfs_inode.c
> +++ b/fs/xfs/xfs_inode.c
> @@ -4299,6 +4299,8 @@ xfs_inode_alloc_unitsize(
>  {
>  	unsigned int		blocks = 1;
>  
> +	if (xfs_inode_has_forcealign(ip))
> +		return ip->i_extsize;

i_extsize is in units of fsblocks, whereas this function returns bytes.
I think you need XFS_FSB_TO_B here?

--D

>  	if (XFS_IS_REALTIME_INODE(ip))
>  		blocks = ip->i_mount->m_sb.sb_rextsize;
>  
> -- 
> 2.31.1
> 
>