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authorTrond Myklebust <Trond.Myklebust@netapp.com>2008-07-07 12:18:53 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2008-07-09 12:09:45 -0400
commit381ba74af55e58bca4c01553835a360a9f6fbb07 (patch)
tree56e5f5159432ebb350af4adf330afa4f50b77a54 /net/sunrpc/rpcb_clnt.c
parentf45663ce5fb30f76a3414ab3ac69f4dd320e760a (diff)
SUNRPC: Ensure our task is notified when an rpcbind call is done
If another task is busy in rpcb_getport_async number, it is more efficient to have it wake us up when it has finished instead of arbitrarily sleeping for 5 seconds. Also ensure that rpcb_wake_rpcbind_waiters() is called regardless of whether or not rpcb_getport_done() gets called. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/rpcb_clnt.c')
-rw-r--r--net/sunrpc/rpcb_clnt.c38
1 files changed, 20 insertions, 18 deletions
diff --git a/net/sunrpc/rpcb_clnt.c b/net/sunrpc/rpcb_clnt.c
index c62e446723a..24e93e0a0a2 100644
--- a/net/sunrpc/rpcb_clnt.c
+++ b/net/sunrpc/rpcb_clnt.c
@@ -68,6 +68,7 @@ enum {
#define RPCB_MAXOWNERLEN sizeof(RPCB_OWNER_STRING)
static void rpcb_getport_done(struct rpc_task *, void *);
+static void rpcb_map_release(void *data);
static struct rpc_program rpcb_program;
struct rpcbind_args {
@@ -80,6 +81,8 @@ struct rpcbind_args {
const char * r_netid;
const char * r_addr;
const char * r_owner;
+
+ int r_status;
};
static struct rpc_procinfo rpcb_procedures2[];
@@ -93,14 +96,6 @@ struct rpcb_info {
static struct rpcb_info rpcb_next_version[];
static struct rpcb_info rpcb_next_version6[];
-static void rpcb_map_release(void *data)
-{
- struct rpcbind_args *map = data;
-
- xprt_put(map->r_xprt);
- kfree(map);
-}
-
static const struct rpc_call_ops rpcb_getport_ops = {
.rpc_call_done = rpcb_getport_done,
.rpc_release = rpcb_map_release,
@@ -112,6 +107,15 @@ static void rpcb_wake_rpcbind_waiters(struct rpc_xprt *xprt, int status)
rpc_wake_up_status(&xprt->binding, status);
}
+static void rpcb_map_release(void *data)
+{
+ struct rpcbind_args *map = data;
+
+ rpcb_wake_rpcbind_waiters(map->r_xprt, map->r_status);
+ xprt_put(map->r_xprt);
+ kfree(map);
+}
+
static struct rpc_clnt *rpcb_create(char *hostname, struct sockaddr *srvaddr,
size_t salen, int proto, u32 version,
int privileged)
@@ -293,17 +297,16 @@ void rpcb_getport_async(struct rpc_task *task)
/* Autobind on cloned rpc clients is discouraged */
BUG_ON(clnt->cl_parent != clnt);
+ /* Put self on the wait queue to ensure we get notified if
+ * some other task is already attempting to bind the port */
+ rpc_sleep_on(&xprt->binding, task, NULL);
+
if (xprt_test_and_set_binding(xprt)) {
- status = -EAGAIN; /* tell caller to check again */
dprintk("RPC: %5u %s: waiting for another binder\n",
task->tk_pid, __func__);
- goto bailout_nowake;
+ return;
}
- /* Put self on queue before sending rpcbind request, in case
- * rpcb_getport_done completes before we return from rpc_run_task */
- rpc_sleep_on(&xprt->binding, task, NULL);
-
/* Someone else may have bound if we slept */
if (xprt_bound(xprt)) {
status = 0;
@@ -365,15 +368,15 @@ void rpcb_getport_async(struct rpc_task *task)
map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID);
map->r_addr = rpc_peeraddr2str(rpcb_clnt, RPC_DISPLAY_UNIVERSAL_ADDR);
map->r_owner = RPCB_OWNER_STRING; /* ignored for GETADDR */
+ map->r_status = -EIO;
child = rpcb_call_async(rpcb_clnt, map, proc);
rpc_release_client(rpcb_clnt);
if (IS_ERR(child)) {
- status = -EIO;
/* rpcb_map_release() has freed the arguments */
dprintk("RPC: %5u %s: rpc_run_task failed\n",
task->tk_pid, __func__);
- goto bailout_nofree;
+ return;
}
rpc_put_task(child);
@@ -382,7 +385,6 @@ void rpcb_getport_async(struct rpc_task *task)
bailout_nofree:
rpcb_wake_rpcbind_waiters(xprt, status);
-bailout_nowake:
task->tk_status = status;
}
EXPORT_SYMBOL_GPL(rpcb_getport_async);
@@ -421,7 +423,7 @@ static void rpcb_getport_done(struct rpc_task *child, void *data)
dprintk("RPC: %5u rpcb_getport_done(status %d, port %u)\n",
child->tk_pid, status, map->r_port);
- rpcb_wake_rpcbind_waiters(xprt, status);
+ map->r_status = status;
}
static int rpcb_encode_mapping(struct rpc_rqst *req, __be32 *p,