Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753091AbdF2Mur (ORCPT ); Thu, 29 Jun 2017 08:50:47 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:41250 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753030AbdF2Muk (ORCPT ); Thu, 29 Jun 2017 08:50:40 -0400 Date: Thu, 29 Jun 2017 14:50:38 +0200 From: Greg KH To: Shaohua Li Cc: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, tj@kernel.org, hch@lst.de, axboe@fb.com, rostedt@goodmis.org, lizefan@huawei.com, Kernel-team@fb.com, Shaohua Li Subject: Re: [PATCH V4 03/12] kernfs: add an API to get kernfs node from inode number Message-ID: <20170629125038.GB26046@kroah.com> References: <39b16490e3f39fb0f576a0b72d2458d164296766.1498666964.git.shli@fb.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <39b16490e3f39fb0f576a0b72d2458d164296766.1498666964.git.shli@fb.com> User-Agent: Mutt/1.8.3 (2017-05-23) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 542 Lines: 14 On Wed, Jun 28, 2017 at 09:29:53AM -0700, Shaohua Li wrote: > From: Shaohua Li > > Add an API to get kernfs node from inode number. We will need this to > implement exportfs operations. > > This API will be used in blktrace too later, so it should be as fast as > possible. To make the API lock free, kernfs node is freed in RCU > context. And we depend on kernfs_node count/ino number to filter out > stale kernfs nodes. > > Signed-off-by: Shaohua Li Acked-by: Greg Kroah-Hartman