linux-ext4 - Re: [man-pages RFC PATCH v4] statx, inode: document the new STATX_INO

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Date:   Sun, 11 Sep 2022 08:13:11 +1000
From:   "NeilBrown" <neilb@...e.de>
To:     "Jeff Layton" <jlayton@...nel.org>
Cc:     "J. Bruce Fields" <bfields@...ldses.org>,
        "Theodore Ts'o" <tytso@....edu>, "Jan Kara" <jack@...e.cz>,
        adilger.kernel@...ger.ca, djwong@...nel.org, david@...morbit.com,
        trondmy@...merspace.com, viro@...iv.linux.org.uk,
        zohar@...ux.ibm.com, xiubli@...hat.com, chuck.lever@...cle.com,
        lczerner@...hat.com, brauner@...nel.org, fweimer@...hat.com,
        linux-man@...r.kernel.org, linux-api@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, ceph-devel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-xfs@...r.kernel.org
Subject: Re: [man-pages RFC PATCH v4] statx, inode: document the new
 STATX_INO_VERSION field

On Fri, 09 Sep 2022, Jeff Layton wrote:
> 
> The machine crashes and comes back up, and we get a query for i_version
> and it comes back as X. Fine, it's an old version. Now there is a write.
> What do we do to ensure that the new value doesn't collide with X+1? 

(I missed this bit in my earlier reply..)

How is it "Fine" to see an old version?
The file could have changed without the version changing.
And I thought one of the goals of the crash-count was to be able to
provide a monotonic change id.

NeilBrown