sunrpc: keep a count of swapfiles associated with the rpc_clnt
Jerome reported seeing a warning pop when working with a swapfile on
NFS. The nfs_swap_activate can end up calling sk_set_memalloc while
holding the rcu_read_lock and that function can sleep.
To fix that, we need to take a reference to the xprt while holding the
rcu_read_lock, set the socket up for swapping and then drop that
reference. But, xprt_put is not exported and having NFS deal with the
underlying xprt is a bit of layering violation anyway.
Fix this by adding a set of activate/deactivate functions that take a
rpc_clnt pointer instead of an rpc_xprt, and have nfs_swap_activate and
nfs_swap_deactivate call those.
Also, add a per-rpc_clnt atomic counter to keep track of the number of
active swapfiles associated with it. When the counter does a 0->1
transition, we enable swapping on the xprt, when we do a 1->0 transition
we disable swapping on it.
This also allows us to be a bit more selective with the RPC_TASK_SWAPPER
flag. If non-swapper and swapper clnts are sharing a xprt, then we only
need to flag the tasks from the swapper clnt with that flag.
Acked-by: Mel Gorman <mgorman@suse.de>
Reported-by: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index f671717..0ba6515 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -891,15 +891,8 @@
task->tk_flags |= RPC_TASK_SOFT;
if (clnt->cl_noretranstimeo)
task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT;
- if (sk_memalloc_socks()) {
- struct rpc_xprt *xprt;
-
- rcu_read_lock();
- xprt = rcu_dereference(clnt->cl_xprt);
- if (xprt->swapper)
- task->tk_flags |= RPC_TASK_SWAPPER;
- rcu_read_unlock();
- }
+ if (atomic_read(&clnt->cl_swapper))
+ task->tk_flags |= RPC_TASK_SWAPPER;
/* Add to the client's list of all tasks */
spin_lock(&clnt->cl_lock);
list_add_tail(&task->tk_task, &clnt->cl_tasks);
@@ -2479,3 +2472,59 @@
spin_unlock(&sn->rpc_client_lock);
}
#endif
+
+#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
+int
+rpc_clnt_swap_activate(struct rpc_clnt *clnt)
+{
+ int ret = 0;
+ struct rpc_xprt *xprt;
+
+ if (atomic_inc_return(&clnt->cl_swapper) == 1) {
+retry:
+ rcu_read_lock();
+ xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
+ rcu_read_unlock();
+ if (!xprt) {
+ /*
+ * If we didn't get a reference, then we likely are
+ * racing with a migration event. Wait for a grace
+ * period and try again.
+ */
+ synchronize_rcu();
+ goto retry;
+ }
+
+ ret = xs_swapper(xprt, 1);
+ xprt_put(xprt);
+ }
+ return ret;
+}
+EXPORT_SYMBOL_GPL(rpc_clnt_swap_activate);
+
+void
+rpc_clnt_swap_deactivate(struct rpc_clnt *clnt)
+{
+ struct rpc_xprt *xprt;
+
+ if (atomic_dec_if_positive(&clnt->cl_swapper) == 0) {
+retry:
+ rcu_read_lock();
+ xprt = xprt_get(rcu_dereference(clnt->cl_xprt));
+ rcu_read_unlock();
+ if (!xprt) {
+ /*
+ * If we didn't get a reference, then we likely are
+ * racing with a migration event. Wait for a grace
+ * period and try again.
+ */
+ synchronize_rcu();
+ goto retry;
+ }
+
+ xs_swapper(xprt, 0);
+ xprt_put(xprt);
+ }
+}
+EXPORT_SYMBOL_GPL(rpc_clnt_swap_deactivate);
+#endif /* CONFIG_SUNRPC_SWAP */