From patchwork Fri Oct 21 13:05:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 13014741 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EF745C4167D for ; Fri, 21 Oct 2022 13:06:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230154AbiJUNGZ (ORCPT ); Fri, 21 Oct 2022 09:06:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44936 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229854AbiJUNGP (ORCPT ); Fri, 21 Oct 2022 09:06:15 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F22E44E854; Fri, 21 Oct 2022 06:06:12 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 991ACB82BFD; Fri, 21 Oct 2022 13:06:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4ECF9C433B5; Fri, 21 Oct 2022 13:06:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1666357570; bh=3UkiypkQG9xLfg+hS+eOV/U1/Tn/AJ7lMyTpKN5KYY4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Nb7Yh47R45XqPtLKFsPoNljbrgHogii3eyJeQw8kYHjoaipnHpNizFXrsizMdjF+r PHs6urb8gnEaX6lrsQW9gE0F2HD99LWIL8nSL1J4uJAXnFtycQJ/32stK0OrJpeRq0 B3mEuntmnKKVKzBO7dC2b6RvaN2SHnSq4CGRVkcuMRHj0nL6p/NSeOTo35Lfog2xra DCIaG2PVYQsS177hQeS57Z/8fw+VgslZwMLCR+MrcbqfRFZ6QzoXM6WJk2x1ulJG1W 0Xl/0GfnwBEsjS/fhLgjWLg4EtHypRr2ix40fu2N5gbUexGEr+A0LI0o/nF3U+UBgB nGToooWNgVthg== From: Jeff Layton To: tytso@mit.edu, adilger.kernel@dilger.ca, djwong@kernel.org, david@fromorbit.com, trondmy@hammerspace.com, neilb@suse.de, viro@zeniv.linux.org.uk, zohar@linux.ibm.com, xiubli@redhat.com, chuck.lever@oracle.com, lczerner@redhat.com, jack@suse.cz, bfields@fieldses.org, brauner@kernel.org, fweimer@redhat.com Cc: linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, ceph-devel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-nfs@vger.kernel.org, linux-xfs@vger.kernel.org, Colin Walters Subject: [PATCH v8 2/8] fs: clarify when the i_version counter must be updated Date: Fri, 21 Oct 2022 09:05:56 -0400 Message-Id: <20221021130602.99099-3-jlayton@kernel.org> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221021130602.99099-1-jlayton@kernel.org> References: <20221021130602.99099-1-jlayton@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org The i_version field in the kernel has had different semantics over the decades, but NFSv4 has certain expectations. Update the comments in iversion.h to describe when the i_version must change. Cc: Colin Walters Cc: NeilBrown Cc: Trond Myklebust Cc: Dave Chinner Signed-off-by: Jeff Layton --- include/linux/iversion.h | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/include/linux/iversion.h b/include/linux/iversion.h index 6755d8b4f20b..94f4dc620d01 100644 --- a/include/linux/iversion.h +++ b/include/linux/iversion.h @@ -9,8 +9,24 @@ * --------------------------- * The change attribute (i_version) is mandated by NFSv4 and is mostly for * knfsd, but is also used for other purposes (e.g. IMA). The i_version must - * appear different to observers if there was a change to the inode's data or - * metadata since it was last queried. + * appear larger to observers if there was an explicit change to the inode's + * data or metadata since it was last queried. + * + * An explicit change is one that would ordinarily result in a change to the + * inode status change time (aka ctime). i_version must appear to change, even + * if the ctime does not (since the whole point is to avoid missing updates due + * to timestamp granularity). If POSIX mandates that the ctime must change due + * to an operation, then the i_version counter must be incremented as well. + * + * Making the i_version update completely atomic with the operation itself would + * be prohibitively expensive. Traditionally the kernel has updated the times on + * directories after an operation that changes its contents. For regular files, + * the ctime is usually updated before the data is copied into the cache for a + * write. This means that there is a window of time when an observer can + * associate a new timestamp with old file contents. Since the purpose of the + * i_version is to allow for better cache coherency, the i_version must always + * be updated after the results of the operation are visible. Updating it before + * and after a change is also permitted. * * Observers see the i_version as a 64-bit number that never decreases. If it * remains the same since it was last checked, then nothing has changed in the