[Devel] RE: [PATCH 4/5] NFS: remove RPC PipeFS mount point reference from blocklayout routines

[tao.peng at emc.com]

> -----Original Message-----
> From: linux-nfs-owner at vger.kernel.org [mailto:linux-nfs-owner at vger.kernel.org] On Behalf Of Stanislav
> Kinsbursky
> Sent: Tuesday, November 29, 2011 6:11 PM
> To: Trond.Myklebust at netapp.com
> Cc: linux-nfs at vger.kernel.org; xemul at parallels.com; neilb at suse.de; netdev at vger.kernel.org; linux-
> kernel at vger.kernel.org; jbottomley at parallels.com; bfields at fieldses.org; davem at davemloft.net;
> devel at openvz.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?

Thanks,
Tao

> 
> Signed-off-by: Stanislav Kinsbursky <skinsbursky at parallels.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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