linux-kernel - Re: [PATCH] kernfs: fix kernfs_node_from

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Message-ID: <20140214160301.GE31544@htj.dyndns.org>
Date:	Fri, 14 Feb 2014 11:03:01 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Cgroups <cgroups@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernfs: fix kernfs_node_from_dentry()

On Fri, Feb 14, 2014 at 04:57:27PM +0800, Li Zefan wrote:
> Currently kernfs_node_from_dentry() returns NULL for root dentry,
> because root_dentry->d_op == NULL.
> 
> Due to this bug cgroupstats_build() returns -EINVAL for root cgroup.
> 
>   # mount -t cgroup -o cpuacct /cgroup
>   # Documentation/accounting/getdelays -C /cgroup
>   fatal reply error,  errno -22
> 
> With this fix:
> 
>   # Documentation/accounting/getdelays -C /cgroup
>   sleeping 305, blocked 0, running 1, stopped 0, uninterruptible 1
> 
> Signed-off-by: Li Zefan <lizefan@...wei.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks!

-- 
tejun
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