linux-kernel - Re: [PATCH] SUNRPC: skip dead but not buried clients on PipeFS events

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Message-ID: <20120419214043.GA23309@fieldses.org>
Date:	Thu, 19 Apr 2012 17:40:43 -0400
From:	"bfields@...ldses.org" <bfields@...ldses.org>
To:	Stanislav Kinsbursky <skinsbursky@...allels.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>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"devel@...nvz.org" <devel@...nvz.org>
Subject: Re: [PATCH] SUNRPC: skip dead but not buried clients on PipeFS
 events

On Thu, Apr 19, 2012 at 03:36:57PM +0400, Stanislav Kinsbursky wrote:
> Sorry, but ignore this patch too.
> It can't be that simple because of these cl_count tricks in rpc_release_client...

OK.  Very minor whine:

> 
> 19.04.2012 14:57, Stanislav Kinsbursky пишет:
> >These clients can't be safely dereferenced if their counter in 0.
> >
> >Signee-off-by: Stanislav Kinsbursky<skinsbursky@...allels.com>
> >
> >Signed-off-by: Stanislav Kinsbursky<skinsbursky@...allels.com>

I don't mind fixing up trivial slips every now and then, but that double
signed-off-by seems to happen on a lot of your posts; could you figure
out what's up with your scripts?

--b.

> >
> >---
> >  net/sunrpc/clnt.c |    3 ++-
> >  1 files changed, 2 insertions(+), 1 deletions(-)
> >
> >diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
> >index 6797246..591994d 100644
> >--- a/net/sunrpc/clnt.c
> >+++ b/net/sunrpc/clnt.c
> >@@ -218,7 +218,8 @@ static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
> >  		if (((event == RPC_PIPEFS_MOUNT)&&  clnt->cl_dentry) ||
> >  		    ((event == RPC_PIPEFS_UMOUNT)&&  !clnt->cl_dentry))
> >  			continue;
> >-		atomic_inc(&clnt->cl_count);
> >+		if (atomic_inc_return(&clnt->cl_count) == 1)
> >+			continue;
> >  		spin_unlock(&sn->rpc_client_lock);
> >  		return clnt;
> >  	}
> >
> 
> 
> -- 
> Best regards,
> Stanislav Kinsbursky
> --
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