linux-kernel - Re: [PATCH V4 07/12] cgroup: export fhandle info for a cgroup

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Message-ID: <20170628181256.GC24647@htj.duckdns.org>
Date:   Wed, 28 Jun 2017 14:12:56 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Shaohua Li <shli@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        gregkh@...uxfoundation.org, hch@....de, axboe@...com,
        rostedt@...dmis.org, lizefan@...wei.com, Kernel-team@...com,
        Shaohua Li <shli@...com>
Subject: Re: [PATCH V4 07/12] cgroup: export fhandle info for a cgroup

On Wed, Jun 28, 2017 at 09:29:57AM -0700, Shaohua Li wrote:
> From: Shaohua Li <shli@...com>
> 
> Add an API to export cgroup fhandle info. We don't export a full 'struct
> file_handle', there are unrequired info. Sepcifically, cgroup is always
> a directory, so we don't need a 'FILEID_INO32_GEN_PARENT' type fhandle,
> we only need export the inode number and generation number just like
> what generic_fh_to_dentry does. And we can avoid the overhead of getting
> an inode too, since kernfs_node_id (ino and generation) has all the info
> required.
> 
> Signed-off-by: Shaohua Li <shli@...com>

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

Thanks.

-- 
tejun