linux-kernel - Re: [PATCH 4/4] NFS: make nfs_client

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Date:	Tue, 07 Feb 2012 18:09:15 +0400
From:	Stanislav Kinsbursky <skinsbursky@...allels.com>
To:	"Myklebust, Trond" <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 4/4] NFS: make nfs_client_lock per net ns

07.02.2012 17:51, Myklebust, Trond пишет:
> 8<-------------------------------------------------------------------------
>  From 5a489156da4fd15dd143f2b21dd9657b97dcef88 Mon Sep 17 00:00:00 2001
> From: Trond Myklebust<Trond.Myklebust@...app.com>
> Date: Tue, 7 Feb 2012 00:05:11 -0500
> Subject: [PATCH] NFS: Initialise the nfs_net->nfs_client_lock
>
> Ensure that we initialise the nfs_net->nfs_client_lock spinlock.
> Also ensure that nfs_server_remove_lists() doesn't try to
> dereference server->nfs_client before that is initialised.
>

Sorry.
Patch looks nice. Except one notice below.

> Signed-off-by: Trond Myklebust<Trond.Myklebust@...app.com>
> Cc: Stanislav Kinsbursky<skinsbursky@...allels.com>
> ---
>   fs/nfs/client.c |    6 +++++-
>   1 files changed, 5 insertions(+), 1 deletions(-)
>
> diff --git a/fs/nfs/client.c b/fs/nfs/client.c
> index 1a5cd49..f0dacad 100644
> --- a/fs/nfs/client.c
> +++ b/fs/nfs/client.c
> @@ -1055,8 +1055,11 @@ static void nfs_server_insert_lists(struct nfs_server *server)
>   static void nfs_server_remove_lists(struct nfs_server *server)
>   {
>   	struct nfs_client *clp = server->nfs_client;
> -	struct nfs_net *nn = net_generic(clp->net, nfs_net_id);
> +	struct nfs_net *nn;
>
> +	if (clp == NULL)
> +		return;
> +	nn = net_generic(clp->net, nfs_net_id);
>   	spin_lock(&nn->nfs_client_lock);
>   	list_del_rcu(&server->client_link);
>   	if (clp&&  list_empty(&clp->cl_superblocks))

This check for clp != NULL can be removed.



-- 
Best regards,
Stanislav Kinsbursky
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