linux-kernel - Re: [RFC PATCH 3/3] sysfs: care-free suicide for sysfs files

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Date:	Thu, 26 Mar 2009 14:24:27 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Alex Chiang <achiang@...com>
CC:	greg@...ah.com, cornelia.huck@...ibm.com,
	stern@...land.harvard.edu, kay.sievers@...y.org,
	rusty@...tcorp.com.au, ebiederm@...ssion.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 3/3] sysfs: care-free suicide for sysfs files

Hello,

Alex Chiang wrote:
> diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
> index 39320a5..993edd1 100644
> --- a/fs/sysfs/dir.c
> +++ b/fs/sysfs/dir.c
> @@ -583,6 +583,8 @@ void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt)
>  		sd->s_sibling = NULL;
>  
>  		sysfs_drop_dentry(sd);
> +		if (sysfs_type(sd) == SYSFS_KOBJ_ATTR)
> +			sysfs_file_check_suicide(sd);
>  		sysfs_deactivate(sd);
>  		sysfs_put(sd);
>  	}

I think there's a hole here.  sysfs_file_check_suicide() should be
done inside sysfs_deactivate() such that commiting suicide atomically
deactivates the sd.  This will solve the multiple writes to suicide
node problem nicely.

Thanks.

-- 
tejun
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