linux-kernel - Re: [PATCH] overlayfs: set ctime when setting mtime and atime

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Date:   Wed, 13 Sep 2023 18:45:02 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     Miklos Szeredi <miklos@...redi.hu>,
        Amir Goldstein <amir73il@...il.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-unionfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] overlayfs: set ctime when setting mtime and atime

On Wed, Sep 13, 2023 at 09:33:12AM -0400, Jeff Layton wrote:
> Nathan reported that he was seeing the new warning in
> setattr_copy_mgtime pop when starting podman containers. Overlayfs is
> trying to set the atime and mtime via notify_change without also
> setting the ctime.
> 
> POSIX states that when the atime and mtime are updated via utimes() that
> we must also update the ctime to the current time. The situation with
> overlayfs copy-up is analogies, so add ATTR_CTIME to the bitmask.
> notify_change will fill in the value.
> 
> Reported-by: Nathan Chancellor <nathan@...nel.org>
> Signed-off-by: Jeff Layton <jlayton@...nel.org>
> ---

Looks good to me,
Acked-by: Christian Brauner <brauner@...nel.org>

So we can wait for ovl to upstream this fix next and then we'll delay
sending the ctime fixes or we'll take this fixup as well. Just let me
know what you all prefer.