linux-ext4 - Re: [PATCH RFC 8/8] xfs: use super write guard in xfs_file

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Message-ID: <20251104170845.GK196370@frogsfrogsfrogs>
Date: Tue, 4 Nov 2025 09:08:45 -0800
From: "Darrick J. Wong" <djwong@...nel.org>
To: Christian Brauner <brauner@...nel.org>
Cc: linux-fsdevel@...r.kernel.org, Alexander Viro <viro@...iv.linux.org.uk>,
	Jan Kara <jack@...e.cz>, linux-btrfs@...r.kernel.org,
	linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org
Subject: Re: [PATCH RFC 8/8] xfs: use super write guard in xfs_file_ioctl()

On Tue, Nov 04, 2025 at 01:12:37PM +0100, Christian Brauner wrote:
> Signed-off-by: Christian Brauner <brauner@...nel.org>
> ---
>  fs/xfs/xfs_ioctl.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
> index a6bb7ee7a27a..f72e96f54cb5 100644
> --- a/fs/xfs/xfs_ioctl.c
> +++ b/fs/xfs/xfs_ioctl.c
> @@ -1408,10 +1408,8 @@ xfs_file_ioctl(
>  
>  		trace_xfs_ioc_free_eofblocks(mp, &icw, _RET_IP_);
>  
> -		sb_start_write(mp->m_super);
> -		error = xfs_blockgc_free_space(mp, &icw);
> -		sb_end_write(mp->m_super);
> -		return error;
> +		scoped_guard(super_write, mp->m_super)
> +			return xfs_blockgc_free_space(mp, &icw);

Can we go full on Java?

#define with_sb_write(sb) scoped_guard(super_write, (sb))

	with_sb_write(mp->m_super)
		return xfs_blockgc_free_space(mp, &icw);

I still keep seeing scoped_guard() as a function call, not the sort of
thing that starts a new block.

[If I missed the bikeshedding war over this, I'll let this go]

--D

>  	}
>  
>  	case XFS_IOC_EXCHANGE_RANGE:
> 
> -- 
> 2.47.3
> 
>