linux-kernel - Re: [PATCH 05/16] GFS2: File and inode operations

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Date:	Mon, 4 Sep 2006 16:55:11 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Steven Whitehouse <swhiteho@...hat.com>
cc:	linux-kernel@...r.kernel.org,
	Russell Cattelan <cattelan@...hat.com>,
	David Teigland <teigland@...hat.com>,
	Ingo Molnar <mingo@...e.hu>, hch@...radead.org
Subject: Re: [PATCH 05/16] GFS2: File and inode operations


>> Is not there a better way to do this? Note that there is also a "nfsd4" process
>> running. Do you really want to do a 'costly'
>> 
>>   strcmp(current->comm, "nfsd") != 0 && strcmp(current->comm, "nfsd4") != 0
>> 
>> every time someone does a readdir? What if I run a userspace nfs daemon?
>> What if that userspace daemon is called differently?
>> 
>> jengelh@...ux01:7 08:28:14 ~ > ps -e | grep nfs
>>  5580 ?        00:00:08 rpc.nfsd
>> jengelh@...ux01:7 08:28:30 ~ > rpm -qf /usr/sbin/rpc.nfsd 
>> nfs-server-2.2beta51-209.2 (a userspace nfsd)
>
>Ah, now this is a very tricky one to solve. Its on my todo list to look
>at this area again. You are right that the test is bogus in that it
>should only respond to the in kernel NFS server and the reason for its

In that case, you could use the fact that ... (I'll express it in C code):

    is_kernel_task = !current->mm;

>existence is due to locking issues with the way that NFS calls through
>the VFS layer.


Jan Engelhardt
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