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From: Frank van der Linden <fllinden@amazon.com>
To: "Mkrtchyan, Tigran" <tigran.mkrtchyan@desy.de>
Cc: linux-nfs <linux-nfs@vger.kernel.org>,
	Anna Schumaker <anna.schumaker@netapp.com>,
	Trond Myklebust <trond.myklebust@hammerspace.com>
Subject: Re: [PATCH v2 00/13] NFS client user xattr (RFC8276) support
Date: Thu, 26 Mar 2020 23:16:02 +0000
Message-ID: <20200326231602.GA29187@dev-dsk-fllinden-2c-c1893d73.us-west-2.amazon.com> (raw)
In-Reply-To: <1885904737.8217161.1585249393750.JavaMail.zimbra@desy.de>

On Thu, Mar 26, 2020 at 08:03:13PM +0100, Mkrtchyan, Tigran wrote:
> The new patchset looks broken to me.
> 
> Client quiryes for supported attributes and gets xattr_support bit set:
> 
> Mar 26 11:27:07 ani.desy.de kernel: decode_attr_supported: bitmask=fcffbfff:40fdbe3e:00040800
> 
> However, the attribute never queries, but client makes is decision:
> 
> Mar 26 11:27:07 ani.desy.de kernel: decode_attr_xattrsupport: XATTR support=false
> 
> The packets can be found here: https://sas.desy.de/index.php/s/GEPiBxPg3eR4aGA
> 
> Can you provide packets of your mount/umount round.

Hi Tigran,

I looked at your packet dump. It seems like your server only supports 4.1,
not 4.2. xattr support builds on 4.2 (within the rules laid out in
RFC 8178).

So, the fsinfo client call, which is just a GETATTR, masks out the 4.2
fattr bits from server->attr_mask, and just uses the 4.1 bits. Meaning that
xattr_support is not included, and defaults to false.

The packet dump also indicates that your server advertises the xattr_support
fattr as supported, even though it's in a 4.1 session, which would not
be correct.

- Frank

  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-25 23:10 Frank van der Linden
2020-03-25 23:10 ` [PATCH v2 01/13] nfs,nfsd: NFSv4.2 extended attribute protocol definitions Frank van der Linden
2020-03-25 23:10 ` [PATCH v2 02/13] nfs: add client side only definitions for user xattrs Frank van der Linden
2020-03-25 23:10 ` [PATCH v2 03/13] NFSv4.2: define limits and sizes for user xattr handling Frank van der Linden
2020-03-25 23:10 ` [PATCH v2 04/13] NFSv4.2: query the server for extended attribute support Frank van der Linden
2020-03-25 23:10 ` [PATCH v2 05/13] NFSv4.2: add client side XDR handling for extended attributes Frank van der Linden
2020-03-25 23:10 ` [PATCH v2 06/13] nfs: define nfs_access_get_cached function Frank van der Linden
2020-03-25 23:10 ` [PATCH v2 07/13] NFSv4.2: query the extended attribute access bits Frank van der Linden
2020-03-25 23:10 ` [PATCH v2 08/13] nfs: modify update_changeattr to deal with regular files Frank van der Linden
2020-03-25 23:10 ` [PATCH v2 09/13] nfs: define and use the NFS_INO_INVALID_XATTR flag Frank van der Linden
2020-03-25 23:10 ` [PATCH v2 10/13] nfs: make the buf_to_pages_noslab function available to the nfs code Frank van der Linden
2020-03-25 23:10 ` [PATCH v2 11/13] NFSv4.2: add the extended attribute proc functions Frank van der Linden
2020-03-25 23:10 ` [PATCH v2 12/13] NFSv4.2: hook in the user extended attribute handlers Frank van der Linden
2020-03-25 23:10 ` [PATCH v2 13/13] NFSv4.2: add client side xattr caching Frank van der Linden
2020-03-26 19:03 ` [PATCH v2 00/13] NFS client user xattr (RFC8276) support Mkrtchyan, Tigran
2020-03-26 19:43   ` Frank van der Linden
2020-03-26 23:16   ` Frank van der Linden [this message]
2020-03-27  7:51     ` Mkrtchyan, Tigran

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