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Open Source and information security mailing list archives
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Date: Sun, 28 Aug 2022 20:30:07 +0300 From: Amir Goldstein <amir73il@...il.com> To: "Darrick J. Wong" <djwong@...nel.org> Cc: Jeff Layton <jlayton@...nel.org>, Theodore Tso <tytso@....edu>, Andreas Dilger <adilger.kernel@...ger.ca>, Dave Chinner <david@...morbit.com>, Trond Myklebust <trondmy@...merspace.com>, Neil Brown <neilb@...e.de>, Al Viro <viro@...iv.linux.org.uk>, Mimi Zohar <zohar@...ux.ibm.com>, xiubli@...hat.com, Chuck Lever <chuck.lever@...cle.com>, Lukas Czerner <lczerner@...hat.com>, Jan Kara <jack@...e.cz>, Christian Brauner <brauner@...nel.org>, Linux API <linux-api@...r.kernel.org>, Linux Btrfs <linux-btrfs@...r.kernel.org>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, linux-kernel <linux-kernel@...r.kernel.org>, Ext4 <linux-ext4@...r.kernel.org>, Linux NFS Mailing List <linux-nfs@...r.kernel.org>, linux-xfs <linux-xfs@...r.kernel.org>, David Wysochanski <dwysocha@...hat.com>, ceph-devel <ceph-devel@...r.kernel.org> Subject: Re: [PATCH v3 4/7] xfs: don't bump the i_version on an atime update in xfs_vn_update_time > > > > > > > > Forensics and other applications that care about atime updates can and > > > > should check atime and don't need i_version to know that it was changed. > > > > The reliability of atime as an audit tool has dropped considerably since > > > > the default in relatime. > > I've been waiting for Amir to appear in this discussion -- ISTR that a > few years ago you were wanting the ability to scan a filesystem to look > for files that have changed since a given point. If XFS exported its > di_changecount file attribute (as it currently behaves) via BULKSTAT, > you'd have the ability to do that, so long as your application could > persist bulkstat data and compare. > It's true that exporting i_version via BULKSTAT could be useful to some backup/sync applications. For my case, I was interested in something a bit different - finding all the changes in a very large fs tree - or IOW finding if anything has changed inside a large tree since a point in time. So not sure if i_version would help for that use case. Thanks, Amir.
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