netdev - Re: [PATCH v2 4/5] NFS: remove RPC PipeFS mount point reference from blocklayout routines

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Date:	Thu, 12 Jan 2012 12:45:25 +0400
From:	Stanislav Kinsbursky <skinsbursky@...allels.com>
To:	Trond Myklebust <Trond.Myklebust@...app.com>
CC:	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	Pavel Emelianov <xemul@...allels.com>,
	"neilb@...e.de" <neilb@...e.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	James Bottomley <jbottomley@...allels.com>,
	"bfields@...ldses.org" <bfields@...ldses.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"devel@...nvz.org" <devel@...nvz.org>
Subject: Re: [PATCH v2 4/5] NFS: remove RPC PipeFS mount point reference from
 blocklayout routines

11.01.2012 22:36, Trond Myklebust пишет:
> On Wed, 2012-01-11 at 13:33 -0500, Trond Myklebust wrote:
>> On Tue, 2012-01-10 at 17:04 +0400, Stanislav Kinsbursky wrote:
>>> This is a cleanup patch. We don't need this reference anymore, because
>>> blocklayout pipes dentries now creates and destroys in per-net operations and
>>> on PipeFS mount/umount notification.
>>> Note that nfs4blocklayout_register_net() now returns 0 instead of -ENOENT in
>>> case of PipeFS superblock absence. This is ok, because blocklayout pipe dentry
>>> will be created on PipeFS mount event.
>>>
>>> Signed-off-by: Stanislav Kinsbursky<skinsbursky@...allels.com>
>>>
>>> ---
>>>   fs/nfs/blocklayout/blocklayout.c |    9 +--------
>>>   1 files changed, 1 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
>>> index 322d920..2c70202 100644
>>> --- a/fs/nfs/blocklayout/blocklayout.c
>>> +++ b/fs/nfs/blocklayout/blocklayout.c
>>> @@ -1034,7 +1034,7 @@ static struct dentry *nfs4blocklayout_register_net(struct net *net,
>>>
>>>   	pipefs_sb = rpc_get_sb_net(net);
>>>   	if (!pipefs_sb)
>>> -		return ERR_PTR(-ENOENT);
>>> +		return 0;
>>
>> This looks like a typo of some sort. The caller in
>> nfs4blocklayout_net_init() checks for IS_ERR(), not NULL. I'll just
>> remove this hunk...
>
> Never mind. I see what's going on now... It should be NULL, and not 0
> for coding style reasons, though...
>

Yep, NULL of course, sorry.

-- 
Best regards,
Stanislav Kinsbursky
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