From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 093CE2D04D for ; Mon, 27 Nov 2023 13:33:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="JaREiByn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7A7D7C433CA; Mon, 27 Nov 2023 13:33:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1701092001; bh=cx4Dcblk+MsRf2KQJVzbyCcuPOZE1Gbvx3HEQmSkQ5E=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=JaREiBynYPY9YkaUTDpgnzN5bwSMf9hNNDoTNRZsFLq1SW6PshXMAdzLyquUVoque NbBDqXEDEZsc1lIXqv2Q1dSzX4VthxTGHSYCaV9CgpO5TzBAIxl2NDAE0zqI8YASWn H69TAAMEtRuOXnCa2ikKMfnltjRbMiRT2zy1HK/Eyj+8uwUu2MWvzZ18KuoJ7mkMnC fgnjQK4Kiqyd6CzrhUftmK2uSb5idMamXDJLpTFZw85RklKSCgdm+dCb0TBpt0h3rW RTLXpjaDubtX0lIc4zxBf0ETK9uZqgZi45DAxcLRZ63QPLX6kTmtIIB9FRsAnuMo5w +6C4QBeAep65w== Message-ID: <8929f9cb12bff93d0020621a371b193ed95e7cad.camel@kernel.org> Subject: Re: foo gets NFSv4 HIDDEN attribute by default by nfsd? Re: How to set the NFSv4 "HIDDEN" attribute on Linux? From: Jeff Layton To: Chuck Lever Cc: Cedric Blancher , Linux NFS Mailing List Date: Mon, 27 Nov 2023 08:33:20 -0500 In-Reply-To: References: <83a30ef92afa05d50232bd3c933f8eb45ed8f98b.camel@kernel.org> <0d7966163db13d71cb4679d51db5cacf91f42b6b.camel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.1 (3.50.1-1.fc39) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Sun, 2023-11-26 at 12:08 -0500, Chuck Lever wrote: > On Sat, Nov 25, 2023 at 09:52:36AM -0500, Jeff Layton wrote: > > On Fri, 2023-11-24 at 12:43 -0500, Chuck Lever wrote: > > > On Thu, Nov 23, 2023 at 11:24:10PM +0100, Cedric Blancher wrote: > > > > Also, it is legal for a nfsd to give the DOT files (/.foo) the HIDD= EN > > > > attribute by default? Right now on Windows they show up because NFS= v4 > > > > HIDDEN is not set, and it is annoying. > > >=20 > > > I suppose an NFS server could do this, but I'm not aware of any > > > other multi-protocol file server (eg, Oracle ZFS or NetApp) that > > > does. > > >=20 > > > Dot-files are obscured on POSIX systems by the NFS clients and their > > > user space (ls and graphical file navigators). I don't see why the > > > Windows NFS client can't be similarly architected. Or perhaps it > > > could fabricate the HIDDEN attribute for such files itself. > >=20 > > Question. GETATTR operates on filehandles, which are roughly analogous > > to inode with Linux nfsd: > >=20 > > $ touch visible > > $ ln visible .hidden > >=20 > > Is the resulting inode and filehandle now considered HIDDEN or not? > >=20 > > These kinds of issues are endemic when trying to map MS Windows concept= s > > onto Linux (and vice-versa). >=20 > The semantics of dot-files and HIDDEN are not the same, truly. >=20 > Interestingly, Samba supports a "hide dot files" option: >=20 > https://www.samba.org/samba/docs/using_samba/ch08.html >=20 > It also implements a regular expression mechanism for faking HIDDEN > based on filename matching. Apparently the Samba folks don't believe > the difference between a HIDDEN inode and an obscured directory > entry is important. Or perhaps they do this to work around missing > local file system support for storing the HIDDEN attribute. >=20 > I think I still prefer implementing an actual file attribute to > store the setting per-file. HIDDEN seems like a characteristic that > should be controlled by the file owner or the (client) application > that is managing a view of the file's parent directory, and not by a > server's administrator. >=20 >=20 Right. Samba has to emulate Windows semantics there, which are very different around whether a dentry is visible to applications. In principle, you could add a STATX_ATTR_HIDDEN flag for this, and leave it up to the filesystem as to whether it should be set. Then if you were exporting something like NTFS you could pass it through properly. I don't see that as terribly useful though. --=20 Jeff Layton