From: Stanislav Kinsbursky <skinsbursky@parallels•com>
To: Trond Myklebust <Trond.Myklebust@netapp•com>
Cc: "linux-nfs@vger•kernel.org" <linux-nfs@vger•kernel.org>,
Pavel Emelianov <xemul@parallels•com>,
"neilb@suse•de" <neilb@suse•de>,
"netdev@vger•kernel.org" <netdev@vger•kernel.org>,
"linux-kernel@vger•kernel.org" <linux-kernel@vger•kernel.org>,
"bfields@fieldses•org" <bfields@fieldses•org>,
"davem@davemloft•net" <davem@davemloft•net>,
"devel@openvz•org" <devel@openvz•org>
Subject: Re: [PATCH v6 1/8] SUNRPC: introduce helpers for reference counted rpcbind clients
Date: Tue, 25 Oct 2011 16:41:43 +0400 [thread overview]
Message-ID: <4EA6AE87.5000309@parallels.com> (raw)
In-Reply-To: <1319541369.2716.1.camel@lade.trondhjem.org>
25.10.2011 15:16, Trond Myklebust пишет:
> On Tue, 2011-10-25 at 14:16 +0300, Stanislav Kinsbursky wrote:
>> v6:
>> 1) added write memory barrier to rpcb_set_local to make sure, that rpcbind
>> clients become valid before rpcb_users assignment
>> 2) explicitly set rpcb_users to 1 instead of incrementing it (looks clearer from
>> my pow).
>>
>> v5: fixed races with rpcb_users in rpcb_get_local()
>>
>> This helpers will be used for dynamical creation and destruction of rpcbind
>> clients.
>> Variable rpcb_users is actually a counter of lauched RPC services. If rpcbind
>> clients has been created already, then we just increase rpcb_users.
>>
>> Signed-off-by: Stanislav Kinsbursky<skinsbursky@parallels•com>
>>
>> ---
>> net/sunrpc/rpcb_clnt.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++
>> 1 files changed, 54 insertions(+), 0 deletions(-)
>>
>> diff --git a/net/sunrpc/rpcb_clnt.c b/net/sunrpc/rpcb_clnt.c
>> index e45d2fb..9fcdb42 100644
>> --- a/net/sunrpc/rpcb_clnt.c
>> +++ b/net/sunrpc/rpcb_clnt.c
>> @@ -114,6 +114,9 @@ static struct rpc_program rpcb_program;
>> static struct rpc_clnt * rpcb_local_clnt;
>> static struct rpc_clnt * rpcb_local_clnt4;
>>
>> +DEFINE_SPINLOCK(rpcb_clnt_lock);
>> +unsigned int rpcb_users;
>> +
>> struct rpcbind_args {
>> struct rpc_xprt * r_xprt;
>>
>> @@ -161,6 +164,57 @@ static void rpcb_map_release(void *data)
>> kfree(map);
>> }
>>
>> +static int rpcb_get_local(void)
>> +{
>> + int cnt;
>> +
>> + spin_lock(&rpcb_clnt_lock);
>> + if (rpcb_users)
>> + rpcb_users++;
>> + cnt = rpcb_users;
>> + spin_unlock(&rpcb_clnt_lock);
>> +
>> + return cnt;
>> +}
>> +
>> +void rpcb_put_local(void)
>> +{
>> + struct rpc_clnt *clnt = rpcb_local_clnt;
>> + struct rpc_clnt *clnt4 = rpcb_local_clnt4;
>> + int shutdown;
>> +
>> + spin_lock(&rpcb_clnt_lock);
>> + if (--rpcb_users == 0) {
>> + rpcb_local_clnt = NULL;
>> + rpcb_local_clnt4 = NULL;
>> + }
>> + shutdown = !rpcb_users;
>> + spin_unlock(&rpcb_clnt_lock);
>> +
>> + if (shutdown) {
>> + /*
>> + * cleanup_rpcb_clnt - remove xprtsock's sysctls, unregister
>> + */
>> + if (clnt4)
>> + rpc_shutdown_client(clnt4);
>> + if (clnt)
>> + rpc_shutdown_client(clnt);
>> + }
>> + return;
>
> I'm removing this before applying...
>
Sorry, but I don't understand what exactly you are removing, and why?
>> +}
>> +
>
--
Best regards,
Stanislav Kinsbursky
next prev parent reply other threads:[~2011-10-25 12:41 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-25 11:15 [PATCH v6 0/8] SUNRPC: make rpcbind clients allocated and destroyed dynamically Stanislav Kinsbursky
2011-10-25 11:16 ` [PATCH v6 1/8] SUNRPC: introduce helpers for reference counted rpcbind clients Stanislav Kinsbursky
[not found] ` <20111025101608.12689.68689.stgit-bi+AKbBUZKagILUCTcTcHdKyNwTtLsGr@public.gmane.org>
2011-10-25 11:16 ` Trond Myklebust
2011-10-25 12:41 ` Stanislav Kinsbursky [this message]
[not found] ` <4EA6AE87.5000309-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-10-25 12:45 ` Trond Myklebust
2011-10-25 13:25 ` Stanislav Kinsbursky
2011-10-25 11:16 ` [PATCH v6 2/8] SUNRPC: use rpcbind reference counting helpers Stanislav Kinsbursky
2011-10-25 11:16 ` [PATCH v6 3/8] SUNRPC: introduce svc helpers for prepairing rpcbind infrastructure Stanislav Kinsbursky
2011-10-25 11:17 ` [PATCH v6 4/8] SUNRPC: setup rpcbind clients if service requires it Stanislav Kinsbursky
[not found] ` <20111025101705.12689.68022.stgit-bi+AKbBUZKagILUCTcTcHdKyNwTtLsGr@public.gmane.org>
2011-10-27 21:27 ` J. Bruce Fields
2011-10-28 9:27 ` Stanislav Kinsbursky
2011-10-25 11:17 ` [PATCH v6 5/8] SUNRPC: cleanup service destruction Stanislav Kinsbursky
2011-10-27 21:30 ` J. Bruce Fields
2011-10-28 9:49 ` Stanislav Kinsbursky
2011-10-25 11:17 ` [PATCH v6 6/8] NFSd: call svc rpcbind cleanup explicitly Stanislav Kinsbursky
2011-10-25 11:17 ` [PATCH v6 7/8] SUNRPC: remove rpcbind clients creation during service registering Stanislav Kinsbursky
2011-10-25 11:17 ` [PATCH v6 8/8] SUNRPC: remove rpcbind clients destruction on module cleanup Stanislav Kinsbursky
-- strict thread matches above, loose matches on Subject: below --
2011-09-20 10:13 [PATCH v4 0/8] SUNRPC: make rpcbind clients allocated and destroyed dynamically Stanislav Kinsbursky
2011-09-20 10:13 ` [PATCH v4 1/8] SUNRPC: introduce helpers for reference counted rpcbind clients Stanislav Kinsbursky
2011-09-20 13:49 ` [PATCH v5 " Stanislav Kinsbursky
2011-09-21 9:07 ` [PATCH v6 " Stanislav Kinsbursky
2011-09-23 14:41 ` Stanislav Kinsbursky
2011-09-23 17:26 ` Myklebust, Trond
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