linux-kernel - Re: [Cluster-devel] gfs2: gfs2_dir_get_hash_table(): avoiding deferred vfree() is easy here...

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Message-ID: <546E2296.1070709@redhat.com>
Date:	Thu, 20 Nov 2014 17:19:18 +0000
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	Al Viro <viro@...IV.linux.org.uk>, linux-kernel@...r.kernel.org
CC:	cluster-devel@...hat.com
Subject: Re: [Cluster-devel] gfs2: gfs2_dir_get_hash_table(): avoiding deferred
 vfree() is easy here...

Hi,

All five patches now in the GFS2 -nmw tree. Thanks,

Steve.

On 20/11/14 05:19, Al Viro wrote:
> vfree() is allowed under spinlock these days, but it's cheaper when
> it doesn't step into deferred case and here it's very easy to avoid.
>
> Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
> ---
>   fs/gfs2/dir.c |    7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
> index c247fed..c5a34f0 100644
> --- a/fs/gfs2/dir.c
> +++ b/fs/gfs2/dir.c
> @@ -370,11 +370,12 @@ static __be64 *gfs2_dir_get_hash_table(struct gfs2_inode *ip)
>   	}
>   
>   	spin_lock(&inode->i_lock);
> -	if (ip->i_hash_cache)
> -		kvfree(hc);
> -	else
> +	if (likely(!ip->i_hash_cache)) {
>   		ip->i_hash_cache = hc;
> +		hc = NULL;
> +	}
>   	spin_unlock(&inode->i_lock);
> +	kvfree(hc);
>   
>   	return ip->i_hash_cache;
>   }

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