linux-kernel - Re: [PATCH] xfs: Add the missed xfs_perag_put() for xfs_ifree

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Date:   Wed, 3 Jun 2020 09:26:59 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Chuhong Yuan <hslester96@...il.com>
Cc:     linux-xfs@...r.kernel.org, Dave Chinner <dchinner@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xfs: Add the missed xfs_perag_put() for
 xfs_ifree_cluster()

On Wed, Jun 03, 2020 at 05:27:07PM +0800, Chuhong Yuan wrote:
> xfs_ifree_cluster() calls xfs_perag_get() at the beginning, but forgets to
> call xfs_perag_put() in one failed path.
> Add the missed function call to fix it.
> 
> Fixes: ce92464c180b ("xfs: make xfs_trans_get_buf return an error code")
> Signed-off-by: Chuhong Yuan <hslester96@...il.com>

Yeah, that looks like a bug, will test.
Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>

--D

> ---
>  fs/xfs/xfs_inode.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
> index d1772786af29..8845faa8161a 100644
> --- a/fs/xfs/xfs_inode.c
> +++ b/fs/xfs/xfs_inode.c
> @@ -2639,8 +2639,10 @@ xfs_ifree_cluster(
>  		error = xfs_trans_get_buf(tp, mp->m_ddev_targp, blkno,
>  				mp->m_bsize * igeo->blocks_per_cluster,
>  				XBF_UNMAPPED, &bp);
> -		if (error)
> +		if (error) {
> +			xfs_perag_put(pag);
>  			return error;
> +		}
>  
>  		/*
>  		 * This buffer may not have been correctly initialised as we
> -- 
> 2.26.2
>