[libvirt] [PATCH] selinux: Only create the selabel_handle once.

[Richard W.M. Jones]

From: "Richard W.M. Jones" <rjones at redhat.com>

According to Eric Paris this is slightly more efficient because it
only loads the regular expressions in libselinux once.
---
 src/security/security_selinux.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/src/security/security_selinux.c b/src/security/security_selinux.c
index a3ef728..8b88785 100644
--- a/src/security/security_selinux.c
+++ b/src/security/security_selinux.c
@@ -935,20 +935,26 @@ virSecuritySELinuxFSetFilecon(int fd, char *tcon)
     return 0;
 }
 
+#if HAVE_SELINUX_LABEL_H
+static struct selabel_handle *sehandle = NULL;
+static virOnceControl sehandleonce = VIR_ONCE_CONTROL_INITIALIZER;
+
+static void
+seHandleInit (void)
+{
+    sehandle = selabel_open(SELABEL_CTX_FILE, NULL, 0);
+}
+#endif
+
 /* Set fcon to the appropriate label for path and mode, or return -1.  */
 static int
 getContext(const char *newpath, mode_t mode, security_context_t *fcon)
 {
 #if HAVE_SELINUX_LABEL_H
-    struct selabel_handle *handle = selabel_open(SELABEL_CTX_FILE, NULL, 0);
-    int ret;
-
-    if (handle == NULL)
+    if (virOnce(&sehandleonce, seHandleInit) < 0 || sehandle == NULL)
         return -1;
 
-    ret = selabel_lookup_raw(handle, fcon, newpath, mode);
-    selabel_close(handle);
-    return ret;
+    return selabel_lookup_raw(sehandle, fcon, newpath, mode);
 #else
     return matchpathcon(newpath, mode, fcon);
 #endif
-- 
1.8.1