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

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Message-ID: <4ED4CDCE.9080804@parallels.com>
Date:	Tue, 29 Nov 2011 16:19:26 +0400
From:	Stanislav Kinsbursky <skinsbursky@...allels.com>
To:	"tao.peng@....com" <tao.peng@....com>
CC:	"Trond.Myklebust@...app.com" <Trond.Myklebust@...app.com>,
	"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 4/5] NFS: remove RPC PipeFS mount point reference from
 blocklayout routines

29.11.2011 16:00, tao.peng@....com пишет:
>> -----Original Message-----
>> From: linux-nfs-owner@...r.kernel.org [mailto:linux-nfs-owner@...r.kernel.org] On Behalf Of Stanislav
>> Kinsbursky
>> Sent: Tuesday, November 29, 2011 6:11 PM
>> To: Trond.Myklebust@...app.com
>> Cc: linux-nfs@...r.kernel.org; xemul@...allels.com; neilb@...e.de; netdev@...r.kernel.org; linux-
>> kernel@...r.kernel.org; jbottomley@...allels.com; bfields@...ldses.org; davem@...emloft.net;
>> devel@...nvz.org
>> Subject: [PATCH 4/5] NFS: remove RPC PipeFS mount point reference from blocklayout routines
>>
>> 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.
> When is the "pipefs mount event" going to happen? When inserting kernel modules or when user issues mount command?
>

When user issues mount command.
Kernel mounts of PipeFS has been removed with all these patch sets I've sent 
already.


> Thanks,
> Tao
>
>>
>> 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 acf7ac9..8211ffd 100644
>> --- a/fs/nfs/blocklayout/blocklayout.c
>> +++ b/fs/nfs/blocklayout/blocklayout.c
>> @@ -1032,7 +1032,7 @@ 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;
>>   	dentry = nfs4blocklayout_register_sb(pipefs_sb, pipe);
>>   	rpc_put_sb_net(net);
>>   	return dentry;
>> @@ -1083,7 +1083,6 @@ static struct pernet_operations nfs4blocklayout_net_ops = {
>>
>>   static int __init nfs4blocklayout_init(void)
>>   {
>> -	struct vfsmount *mnt;
>>   	int ret;
>>
>>   	dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__);
>> @@ -1093,12 +1092,6 @@ static int __init nfs4blocklayout_init(void)
>>   		goto out;
>>
>>   	init_waitqueue_head(&bl_wq);
>> -
>> -	mnt = rpc_get_mount();
>> -	if (IS_ERR(mnt)) {
>> -		ret = PTR_ERR(mnt);
>> -		goto out_remove;
>> -	}
>>   	ret = rpc_pipefs_notifier_register(&nfs4blocklayout_block);
>>   	if (ret)
>>   		goto out_remove;
>>
>> --
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>


-- 
Best regards,
Stanislav Kinsbursky
--
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