[Devel] Re: [PATCH v3 03/11] NFS: move per-net callback thread initialization to nfs_callback_up_net()

[Stanislav Kinsbursky]

25.07.2012 01:47, J. Bruce Fields пишет:
> On Tue, Jul 03, 2012 at 08:19:46PM +0400, Stanislav Kinsbursky wrote:
>> This new function in now called before nfs_minorversion_callback_svc_setup()).
>>
>> Also few small changes:
>> 1) current network namespace in nfs_callback_up() was replaced by transport net.
>> 2) svc_shutdown_net() was moved prior to callback usage counter decrement
>> (because in case of per-net data allocation faulure svc_shutdown_net() have to
>> be skipped).
>>
>> Signed-off-by: Stanislav Kinsbursky <skinsbursky at parallels.com>
>> ---
>>   fs/nfs/callback.c |  125 +++++++++++++++++++++++++++++++++--------------------
>>   fs/nfs/client.c   |    2 -
>>   2 files changed, 79 insertions(+), 48 deletions(-)
>>
>> diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
>> index f8d0c21..b61ed61 100644
>> --- a/fs/nfs/callback.c
>> +++ b/fs/nfs/callback.c
>> @@ -63,6 +63,32 @@ static struct kernel_param_ops param_ops_portnr = {
>>
>>   module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
>>
>> +static int nfs4_callback_up_net(struct svc_serv *serv, struct net *net)
>> +{
>> +	int ret;
>> +
>> +	ret = svc_create_xprt(serv, "tcp", net, PF_INET,
>> +				nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
>> +	if (ret <= 0)
>> +		goto out_err;
>> +	nfs_callback_tcpport = ret;
>> +	dprintk("NFS: Callback listener port = %u (af %u, net %p)\n",
>> +			nfs_callback_tcpport, PF_INET, net);
>> +
>> +	ret = svc_create_xprt(serv, "tcp", net, PF_INET6,
>> +				nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
>> +	if (ret > 0) {
>> +		nfs_callback_tcpport6 = ret;
>> +		dprintk("NFS: Callback listener port = %u (af %u, net %p)\n",
>> +				nfs_callback_tcpport6, PF_INET6, net);
>> +	} else if (ret != -EAFNOSUPPORT)
>> +		goto out_err;
>> +	return 0;
>> +
>> +out_err:
>> +	return (ret) ? ret : -ENOMEM;
>> +}
>> +
>>   /*
>>    * This is the NFSv4 callback kernel thread.
>>    */
>> @@ -104,36 +130,21 @@ nfs4_callback_svc(void *vrqstp)
>>   static struct svc_rqst *
>>   nfs4_callback_up(struct svc_serv *serv, struct rpc_xprt *xprt)
>>   {
>> -	int ret;
>> -
>> -	ret = svc_create_xprt(serv, "tcp", &init_net, PF_INET,
>> -				nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
>> -	if (ret <= 0)
>> -		goto out_err;
>> -	nfs_callback_tcpport = ret;
>> -	dprintk("NFS: Callback listener port = %u (af %u)\n",
>> -			nfs_callback_tcpport, PF_INET);
>> -
>> -	ret = svc_create_xprt(serv, "tcp", &init_net, PF_INET6,
>> -				nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
>> -	if (ret > 0) {
>> -		nfs_callback_tcpport6 = ret;
>> -		dprintk("NFS: Callback listener port = %u (af %u)\n",
>> -				nfs_callback_tcpport6, PF_INET6);
>> -	} else if (ret == -EAFNOSUPPORT)
>> -		ret = 0;
>> -	else
>> -		goto out_err;
>> -
>>   	return svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
>> -
>> -out_err:
>> -	if (ret == 0)
>> -		ret = -ENOMEM;
>> -	return ERR_PTR(ret);
>>   }
>>
>>   #if defined(CONFIG_NFS_V4_1)
>> +static int nfs41_callback_up_net(struct svc_serv *serv, struct net *net)
>> +{
>> +	/*
>> +	 * Create an svc_sock for the back channel service that shares the
>> +	 * fore channel connection.
>> +	 * Returns the input port (0) and sets the svc_serv bc_xprt on success
>> +	 */
>> +	return svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
>> +			      SVC_SOCK_ANONYMOUS);
>> +}
>> +
>>   /*
>>    * The callback service for NFSv4.1 callbacks
>>    */
>> @@ -176,19 +187,6 @@ static struct svc_rqst *
>>   nfs41_callback_up(struct svc_serv *serv, struct rpc_xprt *xprt)
>>   {
>>   	struct svc_rqst *rqstp;
>> -	int ret;
>> -
>> -	/*
>> -	 * Create an svc_sock for the back channel service that shares the
>> -	 * fore channel connection.
>> -	 * Returns the input port (0) and sets the svc_serv bc_xprt on success
>> -	 */
>> -	ret = svc_create_xprt(serv, "tcp-bc", &init_net, PF_INET, 0,
>> -			      SVC_SOCK_ANONYMOUS);
>> -	if (ret < 0) {
>> -		rqstp = ERR_PTR(ret);
>> -		goto out;
>> -	}
>>
>>   	/*
>>   	 * Save the svc_serv in the transport so that it can
>> @@ -204,7 +202,6 @@ nfs41_callback_up(struct svc_serv *serv, struct rpc_xprt *xprt)
>>   		svc_xprt_put(serv->sv_bc_xprt);
>>   		serv->sv_bc_xprt = NULL;
>>   	}
>> -out:
>>   	dprintk("--> %s return %ld\n", __func__,
>>   		IS_ERR(rqstp) ? PTR_ERR(rqstp) : 0);
>>   	return rqstp;
>> @@ -228,6 +225,11 @@ static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
>>   		xprt->bc_serv = cb_info->serv;
>>   }
>>   #else
>> +static int nfs41_callback_up_net(struct svc_serv *serv, struct net *net)
>> +{
>> +	return 0;
>> +}
>> +
>>   static inline int nfs_minorversion_callback_svc_setup(u32 minorversion,
>>   		struct svc_serv *serv, struct rpc_xprt *xprt,
>>   		struct svc_rqst **rqstpp, int (**callback_svc)(void *vrqstp))
>> @@ -241,6 +243,36 @@ static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
>>   }
>>   #endif /* CONFIG_NFS_V4_1 */
>>
>> +static int nfs_callback_up_net(int minorversion, struct svc_serv *serv, struct net *net)
>> +{
>> +	int ret;
>> +
>> +	dprintk("NFS: create per-net callback data; net=%p\n", net);
>> +
>> +	ret = svc_bind(serv, net);
>> +	if (ret < 0) {
>> +		printk(KERN_WARNING "NFS: bind callback service failed\n");
>> +		goto err_bind;
>> +	}
>> +
>> +	if (minorversion) {
>> +		ret = nfs41_callback_up_net(serv, net);
>> +		if (ret < 0)
>> +			goto err_socks;
>> +	}
>> +
>> +	if (ret == 0)
>> +		ret = nfs4_callback_up_net(serv, net);
>
> So in the minorversion 1 case, and in the absence of errors, you set up
> both the 4.1 and 4.0 callback xprts?
>
> That doesn't look right.  You should need only one or the other.
>

Thanks for the catch, Bruce.
I'll fix it and resend.
But currently I'm thinking, that for 3.6 kernel probably it's better to push 
this code through Trond's tree.

-- 
Best regards,
Stanislav Kinsbursky