linux-kernel - Re: [PATCH v4 1/2] hugetlb: use f_mode & FMODE

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Date:   Sat, 13 Jun 2020 07:38:54 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Amir Goldstein <amir73il@...il.com>
Cc:     Mike Kravetz <mike.kravetz@...cle.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linux MM <linux-mm@...ck.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        overlayfs <linux-unionfs@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Miklos Szeredi <miklos@...redi.hu>,
        Colin Walters <walters@...bum.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        syzbot <syzbot+d6ec23007e951dadf3de@...kaller.appspotmail.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: [PATCH v4 1/2] hugetlb: use f_mode & FMODE_HUGETLBFS to identify
 hugetlbfs files

On Sat, Jun 13, 2020 at 09:53:24AM +0300, Amir Goldstein wrote:
> Currently, the only in-tree stacking fs are overlayfs and ecryptfs, but there
> are some out of tree implementations as well (shiftfs).
> So you may only take that option if you do not care about the combination
> of hugetlbfs with any of the above.

I could see shiftfs being interesting, maybe.  I don't really see
the usecase for layering overlayfs or ecryptfs on top of a ram-based
filesystem.