diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
--- a/sys/kern/vfs_vnops.c
+++ b/sys/kern/vfs_vnops.c
@@ -3046,6 +3046,7 @@
     off_t *outoffp, size_t *lenp, unsigned int flags, struct ucred *incred,
     struct ucred *outcred, struct thread *fsize_td)
 {
+	struct mount *inmp, *outmp;
 	int error;
 	size_t len;
 	uint64_t uval;
@@ -3075,20 +3076,50 @@
 	if (len == 0)
 		goto out;
 
+	inmp = invp->v_mount;
+	outmp = outvp->v_mount;
+	if (inmp == NULL || outmp == NULL) {
+		error = EBADF;
+		goto out;
+	}
+
+	for (;;) {
+		error = vfs_busy(inmp, 0);
+		if (error != 0)
+			goto out;
+		if (inmp == outmp)
+			break;
+		error = vfs_busy(outmp, MBF_NOWAIT);
+		if (error != 0) {
+			vfs_unbusy(inmp);
+			if (error == ENOENT) {
+				error = vfs_busy(outmp, 0);
+				if (error == 0) {
+					vfs_unbusy(outmp);
+					continue;
+				}
+			}
+			goto out;
+		}
+		break;
+	}
+
 	/*
 	 * If the two vnodes are for the same file system type, call
 	 * VOP_COPY_FILE_RANGE(), otherwise call vn_generic_copy_file_range()
 	 * which can handle copies across multiple file system types.
 	 */
 	*lenp = len;
-	if (invp->v_mount == outvp->v_mount ||
-	    strcmp(invp->v_mount->mnt_vfc->vfc_name,
-	    outvp->v_mount->mnt_vfc->vfc_name) == 0)
+	if (inmp == outmp || strcmp(inmp->mnt_vfc->vfc_name,
+	    outmp->mnt_vfc->vfc_name) == 0)
 		error = VOP_COPY_FILE_RANGE(invp, inoffp, outvp, outoffp,
 		    lenp, flags, incred, outcred, fsize_td);
 	else
 		error = vn_generic_copy_file_range(invp, inoffp, outvp,
 		    outoffp, lenp, flags, incred, outcred, fsize_td);
+	vfs_unbusy(outmp);
+	if (inmp != outmp)
+		vfs_unbusy(inmp);
 out:
 	return (error);
 }