Re: [PATCH 4/5] NFS: remove RPC PipeFS mount point reference fromblocklayout routines

[Stanislav Kinsbursky]

29.11.2011 16:00, tao.peng@xxxxxxx ÐÐÑÐÑ:
> > -----Original Message-----
> > From: linux-nfs-owner@xxxxxxxxxxxxxxx [mailto:linux-nfs-owner@xxxxxxxxxxxxxxx] On Behalf Of Stanislav
> > Kinsbursky
> > Sent: Tuesday, November 29, 2011 6:11 PM
> > To: Trond.Myklebust@xxxxxxxxxx
> > Cc: linux-nfs@xxxxxxxxxxxxxxx; xemul@xxxxxxxxxxxxx; neilb@xxxxxxx; netdev@xxxxxxxxxxxxxxx; linux-
> > kernel@xxxxxxxxxxxxxxx; jbottomley@xxxxxxxxxxxxx; bfields@xxxxxxxxxxxx; davem@xxxxxxxxxxxxx;
> > devel@xxxxxxxxxx
> > 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@xxxxxxxxxxxxx>
> >
> > ---
> >   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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