From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D9E2FC31E45 for ; Thu, 13 Jun 2019 15:13:57 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9CE7120B7C for ; Thu, 13 Jun 2019 15:13:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="SfHInPm3" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9CE7120B7C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 323016B026A; Thu, 13 Jun 2019 11:13:57 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 2D35F6B026B; Thu, 13 Jun 2019 11:13:57 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 19BA46B026C; Thu, 13 Jun 2019 11:13:57 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-qk1-f199.google.com (mail-qk1-f199.google.com [209.85.222.199]) by kanga.kvack.org (Postfix) with ESMTP id ECCF06B026A for ; Thu, 13 Jun 2019 11:13:56 -0400 (EDT) Received: by mail-qk1-f199.google.com with SMTP id l16so16926426qkk.9 for ; Thu, 13 Jun 2019 08:13:56 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:dkim-signature:date:from:to:cc:subject :message-id:references:mime-version:content-disposition:in-reply-to :user-agent; bh=KkKhR2elMbqIQhtMNyRPKfFVISR0bn0T2g34f2r/Vr8=; b=cWkwQ3EOY/VAhQsyjiOMLZYGJoSKyOxjG1m51i7FdrWh1kX8TsNGAnjHRcCv+Z74W8 a1PB9Yq2EGiLJoRKI/3ex3cyjVoBLZ5dMWGpzSSBeVMst26WSBrG2p7FXND9AR5ePnJf pAbU9DDJXoUbxH+sbaVtgroYlpm7f0oegmDl8dXC8mUrAZ6c0h5ZGPjXcdAbwqFy+/hV p2I/a+ZudP++muWZ6RJ7FRLnkYwIzNXu5HfL/9E8mRsR6cc5NDMaH00CWkUog4fzv9M2 yCRQVHP9LsSfRR2NzM67Pt/wGpVDTkOUtj1KrTNqjBs75QLQjWU6M3lQU23l2LZoU3jI qrXw== X-Gm-Message-State: APjAAAX9xQU/bv2rWxg0D7TKla9ILg04PeYWwMXnasFLDl6BHwLDikoT oAyrEe4lv6eYibAjRfMWwxpFxtT+K7a2QoHqe6kZvz3TVON89r23TP+t4AieK3FNsoAJkP+vCGd fAMpxwa/3GNImfPCGD3pgHKjPyJZggYiA7jAVmvSEo5LD0OVY/HivTRWCGchmgpwqrg== X-Received: by 2002:a37:dc45:: with SMTP id v66mr13221265qki.24.1560438836697; Thu, 13 Jun 2019 08:13:56 -0700 (PDT) X-Received: by 2002:a37:dc45:: with SMTP id v66mr13221219qki.24.1560438836108; Thu, 13 Jun 2019 08:13:56 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1560438836; cv=none; d=google.com; s=arc-20160816; b=n5Z9hotJkvXETxfMCNmsbzQh6yCOvT/zakqDVHSPD15UgdmSSpg3m9+KLPftvyOeH2 NwBWpnnreBbJACvptv/P/RMlR7RbSwvjYXcWJiy9anYR569+x03l0ipbP/LC4chrGCeW OkKegHTGV8Aal3Vmu1eY8V4iFDFDjCWYPnkNQZmkXz+fYrwwSqmwclyV8/hDxedFfS7f 0impjOK9zIfb/na/UkMBgY5Cgis2kwPEGomuGjRlzCUwSK5Y/2FXcvynxdHhe0cGi4B+ WoPuEk4l+mbKhaptGU40XTibR+6kq1LC6LHzNM1yc5eDJjJ7vKQ50Q4x/6iaDKe/6G0v Yuug== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=user-agent:in-reply-to:content-disposition:mime-version:references :message-id:subject:cc:to:from:date:dkim-signature; bh=KkKhR2elMbqIQhtMNyRPKfFVISR0bn0T2g34f2r/Vr8=; b=HZl6lyEcv269TYBXyA2fRbKgtkYv31cVFXqNxyyGGcDZ+xzq3wxXtmaRSPc/MueSQT IRo1y2JdGmYsXsWFND5MrdTquF+5aJB/qSRaQFr0oxX5h5FEneFKU4Oje7vA611608Hl CEZfy5edvThWT7gPy4Wfyfh1WCmu6sKvQBofEV+lY3IcbkRrM3qtzoQPUIa+M8oGEP2O lhY5P09XjIysUeA3wxui5McrsGBMj93BST+prplb7qVe+mSRZ+OMQcmdeEzCzkAPaOqg l4TXpZ3cws+yyF1LB0eNRj+YKsq//QBWfqzTzHzZxPG5Vy/IfQN/A7CWxXQqhMv6l+q9 t2yA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@ziepe.ca header.s=google header.b=SfHInPm3; spf=pass (google.com: domain of jgg@ziepe.ca designates 209.85.220.65 as permitted sender) smtp.mailfrom=jgg@ziepe.ca Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65]) by mx.google.com with SMTPS id r21sor430293qtm.41.2019.06.13.08.13.56 for (Google Transport Security); Thu, 13 Jun 2019 08:13:56 -0700 (PDT) Received-SPF: pass (google.com: domain of jgg@ziepe.ca designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@ziepe.ca header.s=google header.b=SfHInPm3; spf=pass (google.com: domain of jgg@ziepe.ca designates 209.85.220.65 as permitted sender) smtp.mailfrom=jgg@ziepe.ca DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=KkKhR2elMbqIQhtMNyRPKfFVISR0bn0T2g34f2r/Vr8=; b=SfHInPm3DzZYLPoEmUVQqUjB5LScF9DsUpJ4xj+NyGtlotEBCDOd7k0OAiLknLgpy1 UwRMpQmGSzJF0gJD/kcFMjRmesoOZkKPKtk3EWMStIXtk1BSmgVZYNk1p6EKmXc4imPv 1V1hEuNESlphnwH9Ffq42vPqvIo/88Zh85Tr1f4Tsa8YuL7Uls35977s64dpr/1WcL8J ZbYx/FYbcjhIEQbbmhQgdZInCU3g7QIDiBsNO/6qOPrD5yA2TBMRXmDe20WR5bhjdxVZ hMtmCv3lKFvdGH4OgmFjKOdFtkKSEmGywoQe1a2KSSYQTb19JMjkAlD66sOEA23ZLtm9 d4ZA== X-Google-Smtp-Source: APXvYqxrIgS7SEgThFO4xWkROTtAeKu9gS/7k/Y8mWYSTA6O8BjyUZUk4XGZHPcLg6c7oSu9BznGCA== X-Received: by 2002:ac8:2f90:: with SMTP id l16mr60699198qta.12.1560438835818; Thu, 13 Jun 2019 08:13:55 -0700 (PDT) Received: from ziepe.ca (hlfxns017vw-156-34-55-100.dhcp-dynamic.fibreop.ns.bellaliant.net. [156.34.55.100]) by smtp.gmail.com with ESMTPSA id c18sm1546907qkk.73.2019.06.13.08.13.55 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 13 Jun 2019 08:13:55 -0700 (PDT) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1hbRQI-0001rX-U0; Thu, 13 Jun 2019 12:13:54 -0300 Date: Thu, 13 Jun 2019 12:13:54 -0300 From: Jason Gunthorpe To: Dan Williams Cc: Ira Weiny , Jan Kara , Theodore Ts'o , Jeff Layton , Dave Chinner , Matthew Wilcox , linux-xfs , Andrew Morton , John Hubbard , =?utf-8?B?SsOpcsO0bWU=?= Glisse , linux-fsdevel , Linux Kernel Mailing List , linux-nvdimm , linux-ext4 , Linux MM Subject: Re: [PATCH RFC 00/10] RDMA/FS DAX truncate proposal Message-ID: <20190613151354.GC22901@ziepe.ca> References: <20190607121729.GA14802@ziepe.ca> <20190607145213.GB14559@iweiny-DESK2.sc.intel.com> <20190612102917.GB14578@quack2.suse.cz> <20190612114721.GB3876@ziepe.ca> <20190612120907.GC14578@quack2.suse.cz> <20190612191421.GM3876@ziepe.ca> <20190612221336.GA27080@iweiny-DESK2.sc.intel.com> <20190612233324.GE14336@iweiny-DESK2.sc.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Jun 12, 2019 at 06:14:46PM -0700, Dan Williams wrote: > > Effectively, we would need a way for an admin to close a specific file > > descriptor (or set of fds) which point to that file. AFAIK there is no way to > > do that at all, is there? > > Even if there were that gets back to my other question, does RDMA > teardown happen at close(fd), or at final fput() of the 'struct > file'? AFAIK there is no kernel side driver hook for close(fd). rdma uses a normal chardev so it's lifetime is linked to the file_ops release, which is called on last fput. So all the mmaps, all the dups, everything must go before it releases its resources. Jason