linux-ext4 - Re: [PATCH] iversion: update comments with info about atime updates

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Message-ID: <df469d936b2e1c1a8c9c947896fa8a160f33b0e8.camel@kernel.org>
Date:   Tue, 23 Aug 2022 07:51:16 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     NeilBrown <neilb@...e.de>
Cc:     Dave Chinner <david@...morbit.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-integrity@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-ext4@...r.kernel.org,
        Trond Myklebust <trondmy@...merspace.com>
Subject: Re: [PATCH] iversion: update comments with info about atime updates

On Tue, 2022-08-23 at 21:38 +1000, NeilBrown wrote:
> On Tue, 23 Aug 2022, Jeff Layton wrote:
> > So, we can refer to that and simply say:
> > 
> > "If the function updates the mtime or ctime on the inode, then the
> > i_version should be incremented. If only the atime is being updated,
> > then the i_version should not be incremented. The exception to this rule
> > is explicit atime updates via utimes() or similar mechanism, which
> > should result in the i_version being incremented."
> 
> Is that exception needed?  utimes() updates ctime.
> 
> https://man7.org/linux/man-pages/man2/utimes.2.html
> 
> doesn't say that, but
> 
> https://pubs.opengroup.org/onlinepubs/007904875/functions/utimes.html
> 
> does, as does the code.
> 

Oh, good point! I think we can leave that out. Even better!
-- 
Jeff Layton <jlayton@...nel.org>