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    SubjectRe: [PATCH v6 1/8] SUNRPC: introduce helpers for reference counted rpcbind clients
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    On Tue, 2011-10-25 at 16:41 +0400, Stanislav Kinsbursky wrote: 
    > 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?

    The empty 'return' at the end of a void function: it is 100%
    redundant...

    --
    Trond Myklebust
    Linux NFS client maintainer

    NetApp
    Trond.Myklebust@netapp.com
    www.netapp.com

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