From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B82A68488; Fri, 23 Aug 2024 19:15:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724440510; cv=none; b=A2ZmScxhGGFPucwThNlHmNTK3AZ4qcSuhoRHbomSabQKlPD5XpKSjz4xRHOBAnQqpahRGTnoAKUKANLO17KCR69Ct3Yf9WOrLrX9OpeYSDbomrLSDc5LzGqeJ7d5V5DzGxeEagHQfK0Tm3gpLES1ekwoDysYPHnIDQPmOxXB7y0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724440510; c=relaxed/simple; bh=5PRE0FA16nvVZaBBaEc4ebBmsBFYKPxAhMpKCzMCJns=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=OYrCQFf5eEv9LVJeLixkPKFm1avJmQuF82M0LCHNneO9rZt6yO5/W/3uZeqIw0e4SR0BJCtREf/9szdv1oA+2q7I16aRDrcnEU0fOLc1HF0Lg9dTORWJNJBYqM5djxGkZjoZjNzFDUhlvBpTLeQk5m5zSNmgeKkQOVl27fN5lbQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fk2XJzPl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="fk2XJzPl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ABFD4C32786; Fri, 23 Aug 2024 19:15:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724440510; bh=5PRE0FA16nvVZaBBaEc4ebBmsBFYKPxAhMpKCzMCJns=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=fk2XJzPl+ylnBVI27xjLe++RrK6CGLkzKt8AXecrBFTOEgFLdKgxhViwNb6nHgxJk 6e9OJgKdK+JfoS7re4vdoWehXib8e5wq+PKA4DEUBMQY1yxsFfP/HsNsHQMxf4//fg K9l0uVCiUrBMsrORKOuy9udCe3AIfNymyFLHKPd1+XfKUtqUkI89txtRC8Bl3KnFjn KMTHMEv3sWonDQlGvRbhlwnl9EfPOtf3BgyTyc7MZKwEyF3eU/zN54jOlOJEYCiTJJ Ww60jRCZR/SAebANwDw0MPfTJSlfkzliHrIuFB3Hb98mj6VYxRHWl//ebCvcdiH52H jbBlJ6McBD/3A== Message-ID: <36dbebd65676543efe83184cd610da2fda85806a.camel@kernel.org> Subject: Re: [PATCH 1/1] xfs: introduce new file range commit ioctls From: Jeff Layton To: "Darrick J. Wong" Cc: Christoph Hellwig , hch@lst.de, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Date: Fri, 23 Aug 2024 15:15:08 -0400 In-Reply-To: <20240823174140.GJ865349@frogsfrogsfrogs> References: <172437084258.57211.13522832162579952916.stgit@frogsfrogsfrogs> <172437084278.57211.4355071581143024290.stgit@frogsfrogsfrogs> <20240823174140.GJ865349@frogsfrogsfrogs> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn VluJH0/RcxEeFbnSaswVChNSGa7mXJrTR22lRL6ZPjdMgS2Km90haWPRc8Wolcz07Y2se0xpGVLEQ 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CHqumUHRry+RF0lH00clzX/W8OrQJZtoBPXv9ahka/Vp7kEulcBJr1cH5Wz/WprhsIM7U9pse1f1g Yy9YbXtWctUz8uvDR7shsQxAhX3qO7DilMtuGo1v97I/Kx4gXQ52syh/w6EBny71CZrOgD6kJwPVV AaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJO aEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhp f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.4 (3.52.4-1.fc40) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2024-08-23 at 10:41 -0700, Darrick J. Wong wrote: > On Fri, Aug 23, 2024 at 09:20:15AM -0400, Jeff Layton wrote: > > On Thu, 2024-08-22 at 21:12 -0700, Christoph Hellwig wrote: > > > On Thu, Aug 22, 2024 at 05:01:22PM -0700, Darrick J. Wong wrote: > > > > From: Darrick J. Wong > > > >=20 > > > > This patch introduces two more new ioctls to manage atomic > > > > updates to > > > > file contents -- XFS_IOC_START_COMMIT and > > > > XFS_IOC_COMMIT_RANGE.=C2=A0 The > > > > commit mechanism here is exactly the same as what > > > > XFS_IOC_EXCHANGE_RANGE > > > > does, but with the additional requirement that file2 cannot > > > > have changed > > > > since some sampling point.=C2=A0 The start-commit ioctl performs th= e > > > > sampling > > > > of file attributes. > > >=20 > > > The code itself looks simply enough now, but how do we guarantee > > > that ctime actually works as a full change count and not just by > > > chance here? > > >=20 > >=20 > > With current mainline kernels it won't, but the updated multigrain > > timestamp series is in linux-next and is slated to go into v6.12. > > At > > that point it should be fine for this purpose. >=20 > If these both get merged for 6.12, I think the appropriate port > for this patch is to change xfs_ioc_start_commit to do: >=20 > struct kstat kstat; >=20 > fill_mg_cmtime(&kstat, STATX_CTIME | STATX_MTIME, > XFS_I(ip2)); > kern_f->file2_ctime =3D kstat.ctime.tv_sec; > kern_f->file2_ctime_nsec =3D kstat.ctime.tv_nsec; > kern_f->file2_mtime =3D kstat.mtime.tv_sec; > kern_f->file2_mtime_nsec =3D kstat.mtime.tv_nsec; >=20 Yep, that's exactly what you'd want to do. > instead of open-coding the inode_get_[cm]time calls.=C2=A0 The entire > exchangerange feature is still marked experimental, so I didn't think > it > was worth rebasing my entire dev branch on the multigrain timestamp > redux series; we can just fix it later. >=20 Sounds good. --=20 Jeff Layton