From ac579135b0a755f140649297ea22fee7f5f9c9c3 Mon Sep 17 00:00:00 2001
From: Ian Lepore <ian@FreeBSD.org>
Date: Sun, 7 Jan 2018 18:07:22 +0000
Subject: [PATCH] Use EVENTHANDLER_DIRECT_INVOKE for [un]mount events, for
 better performance.

---
 sys/kern/vfs_mount.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/sys/kern/vfs_mount.c b/sys/kern/vfs_mount.c
index dd28dce8567e..070a56c85db1 100644
--- a/sys/kern/vfs_mount.c
+++ b/sys/kern/vfs_mount.c
@@ -41,6 +41,7 @@ __FBSDID("$FreeBSD$");
 
 #include <sys/param.h>
 #include <sys/conf.h>
+#include <sys/eventhandler.h>
 #include <sys/fcntl.h>
 #include <sys/jail.h>
 #include <sys/kernel.h>
@@ -91,6 +92,9 @@ struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist);
 struct mtx mountlist_mtx;
 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF);
 
+EVENTHANDLER_LIST_DEFINE(vfs_mounted);
+EVENTHANDLER_LIST_DEFINE(vfs_unmounted);
+
 /*
  * Global opts, taken by all filesystems
  */
@@ -865,7 +869,7 @@ vfs_domount_first(
 	if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp))
 		panic("mount: lost mount");
 	VOP_UNLOCK(vp, 0);
-	EVENTHANDLER_INVOKE(vfs_mounted, mp, newdp, td);
+	EVENTHANDLER_DIRECT_INVOKE(vfs_mounted, mp, newdp, td);
 	VOP_UNLOCK(newdp, 0);
 	mountcheckdirs(vp, newdp);
 	vrele(newdp);
@@ -1401,7 +1405,7 @@ dounmount(struct mount *mp, int flags, struct thread *td)
 	mtx_lock(&mountlist_mtx);
 	TAILQ_REMOVE(&mountlist, mp, mnt_list);
 	mtx_unlock(&mountlist_mtx);
-	EVENTHANDLER_INVOKE(vfs_unmounted, mp, td);
+	EVENTHANDLER_DIRECT_INVOKE(vfs_unmounted, mp, td);
 	if (coveredvp != NULL) {
 		coveredvp->v_mountedhere = NULL;
 		VOP_UNLOCK(coveredvp, 0);