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From: Trond Myklebust <trondmy@hammerspace.com>
To: "bfields@fieldses.org" <bfields@fieldses.org>,
	"hch@infradead.org" <hch@infradead.org>
Cc: "wangzhibei1999@gmail.com" <wangzhibei1999@gmail.com>,
	"security@kernel.org" <security@kernel.org>,
	"w@1wt.eu" <w@1wt.eu>, "greg@kroah.com" <greg@kroah.com>,
	"linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
	"pgoetz@math.utexas.edu" <pgoetz@math.utexas.edu>,
	"chuck.lever@oracle.com" <chuck.lever@oracle.com>
Subject: Re: nfsd vurlerability submit
Date: Wed, 13 Jan 2021 14:34:45 +0000	[thread overview]
Message-ID: <0da3d3f1fee1a70eab3f78212f9282b03e21fc4d.camel@hammerspace.com> (raw)
In-Reply-To: <20210113081238.GA1428651@infradead.org>

On Wed, 2021-01-13 at 08:12 +0000, Christoph Hellwig wrote:
> FYI, if people really want to use some sort of subtree exports, for
> XFS
> (and probably ext4) we encode the project id into the file handle and
> use the hierarchical project ID inheritance that we already use for
> project quotas.

You'd basically need something along the lines of a NetApp qtree.

i.e. a persisted tag that can label all the files and directories in a
subtree, and that is used to enforce a set of rules that are generally
normally associated with filesystems. So no renames from objects inside
the subtree to directories that lie outside it. No hard links that
cross the subtree boundary.

-- 
Trond Myklebust
Linux NFS client maintainer, Hammerspace
trond.myklebust@hammerspace.com



  reply	other threads:[~2021-01-13 14:35 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAHxDmpTKJfnhGY9CVupyVYhNCTDVKBB6KRwh-E6u_XEPJq4WJQ@mail.gmail.com>
     [not found] ` <20210105165633.GC14893@fieldses.org>
     [not found]   ` <X/hEB8awvGyMKi6x@kroah.com>
     [not found]     ` <20210108152017.GA4183@fieldses.org>
     [not found]       ` <CAHxDmpSp1LHzKD5uqbfi+jcnb+nFaAZbc5++E0oOvLsYvyYDpw@mail.gmail.com>
     [not found]         ` <20210108164433.GB8699@fieldses.org>
     [not found]           ` <CAHxDmpSjwrcr_fqLJa5=Zo=xmbt2Eo9dcy6TQuoU8+F3yVVNhw@mail.gmail.com>
     [not found]             ` <20210110201740.GA8789@fieldses.org>
     [not found]               ` <20210110202815.GB8789@fieldses.org>
     [not found]                 ` <CAHxDmpR8S7NR8OU2nWJmWBdFU9a7wDuDnxviQ2E9RDOeW9fExg@mail.gmail.com>
2021-01-11 19:25                   ` nfsd vurlerability submit J. Bruce Fields
2021-01-11 21:01                     ` [PATCH] nfsd4: readdirplus shouldn't return parent of export J. Bruce Fields
2021-01-12 13:31                       ` Chuck Lever
2021-01-12 13:50                         ` Bruce Fields
     [not found]       ` <20210108152607.GA950@1wt.eu>
     [not found]         ` <20210108153237.GB4183@fieldses.org>
     [not found]           ` <20210108154230.GB950@1wt.eu>
     [not found]             ` <20210111193655.GC2600@fieldses.org>
     [not found]               ` <CAHxDmpR1zG25ADfK2jat4VKGbAOCg6YM_0WA+a_jQE82hbnMjA@mail.gmail.com>
     [not found]                 ` <CAHxDmpRfmVukMR_yF4coioiuzrsp72zBraHWZ8gaMydUuLwKFg@mail.gmail.com>
2021-01-12 15:32                   ` nfsd vurlerability submit J. Bruce Fields
2021-01-12 16:53                     ` Trond Myklebust
2021-01-12 17:20                       ` Patrick Goetz
2021-01-12 18:03                         ` bfields
2021-01-13  8:12                           ` Christoph Hellwig
2021-01-13 14:34                             ` Trond Myklebust [this message]
2021-01-13 14:40                               ` hch
2021-01-13 15:16                                 ` Trond Myklebust
2021-01-13 15:30                                   ` hch
2021-01-13 15:45                                     ` Frank Filz
2021-01-21 20:01                           ` Patrick Goetz
2021-01-21 22:04                             ` bfields
2021-01-21 23:19                               ` Patrick Goetz
2021-01-22  1:30                                 ` bfields
2021-01-22 13:20                                   ` Patrick Goetz
2021-01-22 14:48                                     ` Tom Talpey
     [not found]                       ` <CAHxDmpTEBJ1jd_fr3GJ4k7KgzaBpe1LwKgyZn0AJ0D1ESK12fQ@mail.gmail.com>
2021-01-12 17:47                         ` Trond Myklebust
     [not found]                           ` <CAHxDmpTyrG74hOkzmDK834t+JiQduWHVWxCf_7nrDVa++EK2mA@mail.gmail.com>
2021-01-13 14:25                             ` Trond Myklebust
2021-01-14 18:07                               ` bfields
2021-01-14 18:29                                 ` Linus Torvalds
2021-01-14 18:35                                   ` Chuck Lever
2021-01-14 18:37                                     ` Linus Torvalds
2021-01-18 16:29                       ` 吴异
2021-01-18 22:55                         ` bfields
2021-01-19  2:48                           ` 吴异
2021-01-19  3:46                             ` bfields

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