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Date: Tue, 27 Nov 2012 15:46:25 +0800
From: Liu Bo <bo.li.liu@oracle.com>
To: David Arendt <admin@prnet.org>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: extended attributes wiredness
Message-ID: <20121127074625.GA31592@liubo.cn.oracle.com>
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Hi,  
 
(cc btrfs Mailing list to notify others.)

Thanks for the helpful test.img.

Well...after deeper debug, I'm sure that it's not a btrfs bug,
at least not a btrfs acl/xattr bug. 
 
The debug tree shows 
 
item 10 key (257 INODE_ITEM 0) itemoff 3387 itemsize 160 
        inode generation 6 transid 6 size 102 block group 0 mode 40755 links 1 
item 11 key (257 INODE_REF 256) itemoff 3372 itemsize 15 
        inode ref index 2 namelen 5 name: test1 
item 12 key (257 XATTR_ITEM 367492571) itemoff 3318 itemsize 54 
        location key (0 UNKNOWN.0 0) type 8 
        namelen 24 datalen 0 name: system.posix_acl_default 
                  ^^^^^^^^^^^ 
item 13 key (257 XATTR_ITEM 2038346239) itemoff 3237 itemsize 81 
        location key (0 UNKNOWN.0 0) type 8 
        namelen 23 datalen 28 name: system.posix_acl_access 
        data ^B 
 
========== 

so extended attribute "system.posix_acl_default" here has not data, which'll
make filesystems(not just btrfs) return -ENODATA. 
 
I guess some userspace applications may make it like that. 
 
thanks, 
liubo

On Mon, Nov 26, 2012 at 06:38:06AM +0100, David Arendt wrote:
> Hi,
> 
> I don't know if your xattr patch was meant to fix this issue, but I have
> just tested kernel 3.7-rc7 with your patch applied on another directory
> having the problem and I still have the weird behaviour.
> 
> Thanks in advance,
> David Arendt