linux-kernel - Re: [PATCH v6 7/7] xfs: Support setting FMODE_CAN_ATOMIC

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Message-ID: <20240930164130.GQ21853@frogsfrogsfrogs>
Date: Mon, 30 Sep 2024 09:41:30 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: John Garry <john.g.garry@...cle.com>
Cc: axboe@...nel.dk, brauner@...nel.org, viro@...iv.linux.org.uk,
	jack@...e.cz, dchinner@...hat.com, hch@....de, cem@...nel.org,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	hare@...e.de, martin.petersen@...cle.com,
	catherine.hoang@...cle.com, mcgrof@...nel.org,
	ritesh.list@...il.com, ojaswin@...ux.ibm.com
Subject: Re: [PATCH v6 7/7] xfs: Support setting FMODE_CAN_ATOMIC_WRITE

On Mon, Sep 30, 2024 at 12:54:38PM +0000, John Garry wrote:
> For when an inode is enabled for atomic writes, set FMODE_CAN_ATOMIC_WRITE
> flag. Only direct IO is currently supported, so check for that also.
> 
> Signed-off-by: John Garry <john.g.garry@...cle.com>

Looks good,
Reviewed-by: Darrick J. Wong <djwong@...nel.org>

--D

> ---
>  fs/xfs/xfs_file.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
> index fa6a44b88ecc..a358657a1ae6 100644
> --- a/fs/xfs/xfs_file.c
> +++ b/fs/xfs/xfs_file.c
> @@ -1208,6 +1208,16 @@ xfs_file_remap_range(
>  	return remapped > 0 ? remapped : ret;
>  }
>  
> +static bool
> +xfs_file_open_can_atomicwrite(
> +	struct inode		*inode,
> +	struct file		*file)
> +{
> +	if (!(file->f_flags & O_DIRECT))
> +		return false;
> +	return xfs_inode_can_atomicwrite(XFS_I(inode));
> +}
> +
>  STATIC int
>  xfs_file_open(
>  	struct inode	*inode,
> @@ -1216,6 +1226,8 @@ xfs_file_open(
>  	if (xfs_is_shutdown(XFS_M(inode->i_sb)))
>  		return -EIO;
>  	file->f_mode |= FMODE_NOWAIT | FMODE_CAN_ODIRECT;
> +	if (xfs_file_open_can_atomicwrite(inode, file))
> +		file->f_mode |= FMODE_CAN_ATOMIC_WRITE;
>  	return generic_file_open(inode, file);
>  }
>  
> -- 
> 2.31.1
> 
>