Re: [PATCH 00/13] client side user xattr (RFC8276) support

["Mkrtchyan, Tigran" <tigran.mkrtchyan@desy.de>]

I have applied the patchset and run simple test against dCache nfs server:

root@anahit xattr-test]# df -h .
Filesystem      Size  Used Avail Use% Mounted on
ani:/           213G  179G   35G  84% /mnt
[root@anahit xattr-test]#
[root@anahit xattr-test]# touch file.txt
[root@anahit xattr-test]# attr -l file.txt
[root@anahit xattr-test]# attr -s key1 -V value1 file.txt
Attribute "key1" set to a 6 byte value for file.txt:
value1
[root@anahit xattr-test]# attr -s key2 -V value2 file.txt
Attribute "key2" set to a 6 byte value for file.txt:
value2
[root@anahit xattr-test]# attr -l file.txt
Attribute "user.key1" has a 6 byte value for file.txt
Attribute "user.key2" has a 6 byte value for file.txt
[root@anahit xattr-test]# attr -g key1 file.txt
Attribute "key1" had a 6 byte value for file.txt:
value1
[root@anahit xattr-test]# attr -g key2 file.txt
Attribute "key2" had a 6 byte value for file.txt:
value2
[root@anahit xattr-test]# getfattr -n user.key1 file.txt
# file: file.txt
user.key1="value1"

[root@anahit xattr-test]# getfattr -n user.key2 file.txt
# file: file.txt
user.key2="value2"

[root@anahit xattr-test]# attr -r key1 file.txt
[root@anahit xattr-test]# attr -r key2 file.txt
[root@anahit xattr-test]# attr -l file.txt
[root@anahit xattr-test]#


At lease a dirrerent implementation in addition to linux server works as expected.

Tested-by:  "Tigran Mkrtchyan" <tigran.mkrtchyan@desy.de>


Tigran.

----- Original Message -----
> From: "Frank van der Linden" <fllinden@amazon.com>
> To: "Trond Myklebust" <trond.myklebust@hammerspace.com>, "Anna Schumaker" <anna.schumaker@netapp.com>, "linux-nfs"
> <linux-nfs@vger.kernel.org>
> Cc: "Frank van der Linden" <fllinden@amazon.com>
> Sent: Wednesday, March 11, 2020 8:56:00 PM
> Subject: [PATCH 00/13] client side user xattr (RFC8276) support

> This patchset implements the client side for NFS user extended attributes,
> as defined in RFC8726.
> 
> This was originally posted as an RFC in:
> 
> https://patchwork.kernel.org/cover/11143565/
> 
> Patch 1 is shared with the server side patch, posted
> separately.
> 
> Most comments in there still apply, except that:
> 
> 1. Client side caching is now included in this patch set.
> 2. 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 on either the client or the server.
> 3. The code is no longer conditioned on a config option.
> 4. The number of patches has been reduced somewhat by merging
>   smaller, related ones.
> 
> The client side caching is implemented through a per-inode hash table,
> which is allocated on demand. See fs/nfs/nfs42xattr.c for details.
> 
> This has been tested as follows:
> 
> * Linux client and server:
>	* 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).
>	* Stress tested caching, trying to run the client out of memory.
> 
> * Tested against the FreeBSD-current implementation as well, which works
>  (after I fixed 2 bugs in that implementation, which I'm sending out to
>  them too).
> 
> * Not tested: RDMA (I couldn't get a setup going).
> 
> Frank van der Linden (13):
>  nfs,nfsd:  NFSv4.2 extended attribute protocol definitions
>  nfs: add client side only definitions for user xattrs
>  NFSv4.2: query the server for extended attribute support
>  NFSv4.2: define limits and sizes for user xattr handling
>  NFSv4.2: add client side XDR handling for extended attributes
>  nfs: define nfs_access_get_cached function
>  NFSv4.2: query the extended attribute access bits
>  nfs: modify update_changeattr to deal with regular files
>  nfs: define and use the NFS_INO_INVALID_XATTR flag
>  nfs: make the buf_to_pages_noslab function available to the nfs code
>  NFSv4.2: add the extended attribute proc functions.
>  NFSv4.2: hook in the user extended attribute handlers
>  NFSv4.2: add client side xattr caching.
> 
> fs/nfs/Makefile             |    1 +
> fs/nfs/client.c             |   19 +-
> fs/nfs/dir.c                |   24 +-
> fs/nfs/inode.c              |   16 +-
> fs/nfs/internal.h           |   28 ++
> fs/nfs/nfs42.h              |   24 +
> fs/nfs/nfs42proc.c          |  248 ++++++++++
> fs/nfs/nfs42xattr.c         | 1083 +++++++++++++++++++++++++++++++++++++++++++
> fs/nfs/nfs42xdr.c           |  442 ++++++++++++++++++
> fs/nfs/nfs4_fs.h            |    5 +
> fs/nfs/nfs4client.c         |   31 ++
> fs/nfs/nfs4proc.c           |  248 ++++++++--
> fs/nfs/nfs4super.c          |   10 +
> fs/nfs/nfs4xdr.c            |   29 ++
> fs/nfs/nfstrace.h           |    3 +-
> include/linux/nfs4.h        |   25 +
> include/linux/nfs_fs.h      |   12 +
> include/linux/nfs_fs_sb.h   |    6 +
> include/linux/nfs_xdr.h     |   60 ++-
> include/uapi/linux/nfs4.h   |    3 +
> include/uapi/linux/nfs_fs.h |    1 +
> 21 files changed, 2276 insertions(+), 42 deletions(-)
> create mode 100644 fs/nfs/nfs42xattr.c
> 
> --
> 2.16.6