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From: Bruce Fields <bfields@fieldses.org>
To: Frank van der Linden <fllinden@amazon.com>
Cc: Chuck Lever <chucklever@gmail.com>,
	Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: [RFC PATCH 00/35] user xattr support (RFC8276)
Date: Mon, 4 Nov 2019 17:58:46 -0500
Message-ID: <20191104225846.GA13469@fieldses.org> (raw)
In-Reply-To: <20191104162147.GA31399@dev-dsk-fllinden-2c-c1893d73.us-west-2.amazon.com>

On Mon, Nov 04, 2019 at 04:21:47PM +0000, Frank van der Linden wrote:
> On Mon, Nov 04, 2019 at 10:36:03AM -0500, Chuck Lever wrote:
> > 
> > Following the server's local file systems' mount options seems like a
> > good way to go. In particular, is there a need to expose user xattrs
> > on the server host, but prevent NFS clients' access to them? I can't
> > think of one.
> 
> Ok, that sounds fine to me - I'll remove the user_xattr export flag,
> and we had already agreed to do away with the CONFIGs.
> 
> That leaves one last item with regard to enabling support: the client side
> mount option. I assume the [no]user_xattr option should work the same as
> with other filesystems. What about the default setting?

Just checking code for other filesystems quickly; if I understand right:

	- ext4 has user_xattr and nouser_xattr options, but you get a
	  deprecation warning if you try to use the latter;
	- xfs doesn't support either option;
	- cifs supports both, with xattr support the default.

Not necessarily my call, but just for simplicity's sake, I'd probably
leave out the option and see if anybody complains.

> Also, currently, my code does not fail the mount operation if user xattrs
> are asked for, but the server does not support them. It just doesn't
> set NFS_CAP_XATTR for the server, and the xattr handler entry points
> eturn -EOPNOTSUPP, as they check for NFS_CAP_XATTR. What's the preferred
> behavior there?

getxattr(2) under ERRORS says:

	ENOTSUP
	      Extended attributes are not supported by the filesystem,
	      or  are disabled.

so I'm guessing just erroring out is clearest.

I also see there's an EOPNOTSUPP return in the nouser_xattr case in
ext4_xattr_user_get.  (errno(3) says ENOTSUP and EOPNOTSUPP are the same
value on Linux.)

--b.

  reply index

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-12 17:25 Frank van der Linden
2019-07-01 17:56 ` [RFC PATCH 02/35] nfs/nfsd: basic NFS4 extended attribute definitions Frank van der Linden
2019-08-26 21:38 ` [RFC PATCH 03/35] NFSv4.2: query the server for extended attribute support Frank van der Linden
2019-08-26 21:53 ` [RFC PATCH 04/35] nfs: parse the {no}user_xattr option Frank van der Linden
2019-08-26 22:06 ` [RFC PATCH 05/35] NFSv4.2: define a function to compute the maximum XDR size for listxattr Frank van der Linden
2019-08-26 22:23 ` [RFC PATCH 06/35] NFSv4.2: define and set initial limits for extended attributes Frank van der Linden
2019-08-26 22:32 ` [RFC PATCH 07/35] NFSv4.2: define argument and response structures for xattr operations Frank van der Linden
2019-08-26 22:44 ` [RFC PATCH 08/35] NFSv4.2: define the encode/decode sizes for the XATTR operations Frank van der Linden
2019-08-26 23:09 ` [RFC PATCH 09/35] NFSv4.2: define and use extended attribute overhead sizes Frank van der Linden
2019-08-27 15:34 ` [RFC PATCH 10/35] NFSv4.2: add client side XDR handling for extended attributes Frank van der Linden
2019-08-27 15:46 ` [RFC PATCH 11/35] nfs: define nfs_access_get_cached function Frank van der Linden
2019-08-27 16:01 ` [RFC PATCH 12/35] NFSv4.2: query the extended attribute access bits Frank van der Linden
2019-08-27 22:51 ` [RFC PATCH 13/35] nfs: modify update_changeattr to deal with regular files Frank van der Linden
2019-08-30 22:48 ` [RFC PATCH 14/35] nfs: define and use the NFS_INO_INVALID_XATTR flag Frank van der Linden
2019-08-30 22:56 ` [RFC PATCH 15/35] nfs: make the buf_to_pages_noslab function available to the nfs code Frank van der Linden
2019-08-30 23:15 ` [RFC PATCH 16/35] NFSv4.2: add the extended attribute proc functions Frank van der Linden
2019-08-30 23:31 ` [RFC PATCH 17/35] NFSv4.2: hook in the user extended attribute handlers Frank van der Linden
2019-08-30 23:38 ` [RFC PATCH 18/35] NFSv4.2: add client side xattr caching functions Frank van der Linden
2019-08-30 23:45 ` [RFC PATCH 19/35] NFSv4.2: call the xattr cache functions Frank van der Linden
2019-08-30 23:59 ` [RFC PATCH 20/35] nfs: add the NFS_V4_XATTR config option Frank van der Linden
2019-08-31  2:12 ` [RFC PATCH 21/35] xattr: modify vfs_{set,remove}xattr for NFS server use Frank van der Linden
2019-08-31 19:00 ` [RFC PATCH 22/35] nfsd: split off the write decode code in to a seperate function Frank van der Linden
2019-08-31 19:19 ` [RFC PATCH 23/35] nfsd: add defines for NFSv4.2 extended attribute support Frank van der Linden
2019-08-31 21:35 ` [RFC PATCH 26/35] nfsd: add structure definitions for xattr requests / responses Frank van der Linden
2019-08-31 23:53 ` [RFC PATCH 24/35] nfsd: define xattr functions to call in to their vfs counterparts Frank van der Linden
2019-09-01  0:13 ` [RFC PATCH 25/35] nfsd: take xattr access bits in to account when checking Frank van der Linden
2019-09-01  1:19 ` [RFC PATCH 27/35] nfsd: implement the xattr procedure functions Frank van der Linden
2019-09-01  2:46 ` [RFC PATCH 01/35] nfsd: make sure the nfsd4_ops array has the right size Frank van der Linden
2019-09-02 19:40 ` [RFC PATCH 28/35] nfsd: define xattr reply size functions Frank van der Linden
2019-09-02 19:58 ` [RFC PATCH 29/35] nfsd: add xattr XDR decode functions Frank van der Linden
2019-09-02 20:09 ` [RFC PATCH 30/35] nfsd: add xattr XDR encode functions Frank van der Linden
2019-09-02 20:19 ` [RFC PATCH 31/35] nfsd: add xattr operations to ops array Frank van der Linden
2019-09-02 20:34 ` [RFC PATCH 32/35] xattr: add a function to check if a namespace is supported Frank van der Linden
2019-09-02 21:30 ` [RFC PATCH 33/35] nfsd: add fattr support for user extended attributes Frank van der Linden
2019-09-02 23:06 ` [RFC PATCH 34/35] nfsd: add export flag to disable " Frank van der Linden
2019-09-02 23:17 ` [RFC PATCH 35/35] nfsd: add NFSD_V4_XATTR config option Frank van der Linden
2019-10-24 20:16 ` [RFC PATCH 00/35] user xattr support (RFC8276) Chuck Lever
2019-10-24 23:15   ` Frank van der Linden
2019-10-25 19:55     ` Chuck Lever
2019-11-04  3:01       ` bfields
2019-11-04 15:36         ` Chuck Lever
2019-11-04 16:21           ` Frank van der Linden
2019-11-04 22:58             ` Bruce Fields [this message]
2019-11-05  0:06               ` Frank van der Linden
2019-11-05 15:44               ` Chuck Lever

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