linux-kernel - Re: [PATCH v2 2/2] ceph: quota: fix quota subdir mounts

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Message-ID: <CAAM7YAmt+OS8=ycPrtLLe_FqeD2F_szdkShNAPA49FOPoJd+Gg@mail.gmail.com>
Date:   Mon, 18 Mar 2019 17:12:39 +0800
From:   "Yan, Zheng" <ukernel@...il.com>
To:     Gregory Farnum <gfarnum@...hat.com>
Cc:     "Yan, Zheng" <zyan@...hat.com>,
        Luis Henriques <lhenriques@...e.com>,
        Sage Weil <sage@...hat.com>, Ilya Dryomov <idryomov@...il.com>,
        ceph-devel <ceph-devel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hendrik Peyerl <hpeyerl@...sline.net>
Subject: Re: [PATCH v2 2/2] ceph: quota: fix quota subdir mounts

On Mon, Mar 18, 2019 at 5:06 PM Gregory Farnum <gfarnum@...hat.com> wrote:
>
> On Mon, Mar 18, 2019 at 2:32 PM Yan, Zheng <ukernel@...il.com> wrote:
> > After reading the code carefully. I feel a little uncomfortable with
> > the "lookup_ino" in get_quota_realm.  how about populating directories
> > above the 'mount subdir' during mounting (similar to cifs_get_root ).
>
> Isn't that going to be a problem for any clients which have restricted
> filesystem access permissions? They may not be able to see all the
> directories above their mount point.
> -Greg

using lookup_ino to get inode above the "mount subdir" has the same problem