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Subject: Re: [PATCH v3 00/10] server side user xattr support (RFC 8276)
From:   Chuck Lever <chuck.lever@oracle.com>
In-Reply-To: <20200623223927.31795-1-fllinden@amazon.com>
Date:   Sat, 4 Jul 2020 10:37:37 -0400
Cc:     Bruce Fields <bfields@fieldses.org>,
        Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>
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References: <20200623223927.31795-1-fllinden@amazon.com>
To:     Frank van der Linden <fllinden@amazon.com>,
        Al Viro <viro@zeniv.linux.org.uk>
Sender: linux-nfs-owner@vger.kernel.org
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> On Jun 23, 2020, at 6:39 PM, Frank van der Linden =
<fllinden@amazon.com> wrote:
>=20
> v3:
>  * Rebase to v5.8-rc2
>  * Use length probe + allocate + query for the listxattr and setxattr
>    operations to avoid allocating unneeded space.
>  * Because of the above, drop the 'use kvmalloc for svcxdr_tmpalloc' =
patch,
>    as it's no longer needed.

v3 of this series has been applied to nfsd-5.9. Thanks!

See: git://git.linux-nfs.org/projects/cel/cel-2.6.git nfsd-5.9

Still waiting for Acks on 01/13 and 02/13.


> v2:
>  * As per the discussion, user extended attributes are enabled if
>    the client and server support them (e.g. they support 4.2 and
>    advertise the user extended attribute FATTR). There are no longer
>    options to switch them off.
>  * The code is no longer conditioned on a config option.
>  * The number of patches has been reduced somewhat by merging
>    smaller, related ones.
>  * Renamed some functions and added parameter comments as requested.
>=20
> v1:
>=20
>  * Split in to client and server (changed from the original RFC =
patch).
>=20
> Original RFC combined set is here:
>=20
> https://www.spinics.net/lists/linux-nfs/msg74843.html
>=20
> In general, these patches were, both server and client, tested as
> follows:
> 	* stress-ng-xattr with 1000 workers
> 	* Test all corner cases (XATTR_SIZE_*)
> 	* Test all failure cases (no xattr, setxattr with different or
> 	  invalid flags, etc).
> 	* Verify the content of xattrs across several operations.
> 	* Use KASAN and KMEMLEAK for a longer mix of testruns to verify
> 	  that there were no leaks (after unmounting the filesystem).
> 	* Interop run against FreeBSD server/client implementation.
> 	* Ran xfstests-dev, with no unexpected/new failures as compared
> 	  to an unpatched kernel. To fully use xfstests-dev, it needed
> 	  some modifications, as it expects to either use all xattr
> 	  namespaces, or none. Whereas NFS only suppors the "user."
> 	  namespace (+ optional ACLs). I will send the changes in
> 	  seperately.
>=20
>=20
> Frank van der Linden (10):
>  xattr: break delegations in {set,remove}xattr
>  xattr: add a function to check if a namespace is supported
>  nfs,nfsd: NFSv4.2 extended attribute protocol definitions
>  nfsd: split off the write decode code in to a separate function
>  nfsd: add defines for NFSv4.2 extended attribute support
>  nfsd: define xattr functions to call in to their vfs counterparts
>  nfsd: take xattr bits in to account for permission checks
>  nfsd: add structure definitions for xattr requests / responses
>  nfsd: implement the xattr functions and en/decode logic
>  nfsd: add fattr support for user extended attributes
>=20
> fs/nfsd/nfs4proc.c        | 128 ++++++++-
> fs/nfsd/nfs4xdr.c         | 531 +++++++++++++++++++++++++++++++++++---
> fs/nfsd/nfsd.h            |   5 +-
> fs/nfsd/vfs.c             | 239 +++++++++++++++++
> fs/nfsd/vfs.h             |  10 +
> fs/nfsd/xdr4.h            |  31 +++
> fs/xattr.c                | 111 +++++++-
> include/linux/nfs4.h      |  22 +-
> include/linux/xattr.h     |   4 +
> include/uapi/linux/nfs4.h |   3 +
> 10 files changed, 1044 insertions(+), 40 deletions(-)
>=20
> --=20
> 2.17.2
>=20

--
Chuck Lever