Index: head/sys/fs/msdosfs/msdosfs_vfsops.c
===================================================================
--- head/sys/fs/msdosfs/msdosfs_vfsops.c
+++ head/sys/fs/msdosfs/msdosfs_vfsops.c
@@ -950,6 +950,12 @@
 	error = msdosfs_fsiflush(pmp, waitfor);
 	if (error != 0)
 		allerror = error;
+
+	if (allerror == 0 && waitfor == MNT_SUSPEND) {
+		MNT_ILOCK(mp);
+		mp->mnt_kern_flag |= MNTK_SUSPEND2 | MNTK_SUSPENDED;
+		MNT_IUNLOCK(mp);
+	}
 	return (allerror);
 }
 
Index: head/sys/fs/msdosfs/msdosfs_vnops.c
===================================================================
--- head/sys/fs/msdosfs/msdosfs_vnops.c
+++ head/sys/fs/msdosfs/msdosfs_vnops.c
@@ -848,7 +848,7 @@
 	* Non-critical metadata for associated directory entries only
 	* gets synced accidentally, as in most file systems.
 	*/
-	if (ap->a_waitfor == MNT_WAIT) {
+	if (ap->a_waitfor != MNT_NOWAIT) {
 		devvp = VTODE(ap->a_vp)->de_pmp->pm_devvp;
 		vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
 		allerror = VOP_FSYNC(devvp, MNT_WAIT, ap->a_td);
@@ -856,7 +856,7 @@
 	} else
 		allerror = 0;
 
-	error = deupdat(VTODE(ap->a_vp), ap->a_waitfor == MNT_WAIT);
+	error = deupdat(VTODE(ap->a_vp), ap->a_waitfor != MNT_NOWAIT);
 	if (allerror == 0)
 		allerror = error;
 	return (allerror);