Created a function for setting timeouts on keys
The keyctl_set_timeout function isn't exported to other parts of the
kernel, but I want to use it for the NFS idmapper. I already have the
key, but I wanted a generic way to set the timeout.
Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/security/keys/key.c b/security/keys/key.c
index 7ada801..06783cf 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -671,6 +671,26 @@
return ktype;
}
+void key_set_timeout(struct key *key, unsigned timeout)
+{
+ struct timespec now;
+ time_t expiry = 0;
+
+ /* make the changes with the locks held to prevent races */
+ down_write(&key->sem);
+
+ if (timeout > 0) {
+ now = current_kernel_time();
+ expiry = now.tv_sec + timeout;
+ }
+
+ key->expiry = expiry;
+ key_schedule_gc(key->expiry + key_gc_delay);
+
+ up_write(&key->sem);
+}
+EXPORT_SYMBOL_GPL(key_set_timeout);
+
/*
* Unlock a key type locked by key_type_lookup().
*/