Index: sys/kern/vfs_vnops.c
===================================================================
--- sys/kern/vfs_vnops.c
+++ sys/kern/vfs_vnops.c
@@ -3463,8 +3463,10 @@
 
 static int
 vn_deallocate_impl(struct vnode *vp, off_t *offset, off_t *length, int flags,
-    int ioflag, struct ucred *active_cred, struct ucred *file_cred)
+    int ioflag, struct ucred *active_cred, struct ucred *file_cred,
+    bool from_fops)
 {
+	struct ucred *cred;
 	struct mount *mp;
 	void *rl_cookie;
 	off_t off, len;
@@ -3508,9 +3510,14 @@
 			error = mac_vnode_check_write(active_cred, file_cred,
 			    vp);
 #endif
-		if (error == 0)
+		if (error == 0) {
+			if (file_cred != NULL && !from_fops)
+				cred = file_cred;
+			else
+				cred = active_cred;
 			error = VOP_DEALLOCATE(vp, &off, &len, flags, ioflag,
-			    active_cred);
+			    cred);
+		}
 
 		if ((ioflag & IO_NODELOCKED) == 0) {
 			VOP_UNLOCK(vp);
@@ -3541,7 +3548,7 @@
 		return (ENODEV);
 
 	return (vn_deallocate_impl(vp, offset, length, flags, ioflag,
-	    active_cred, file_cred));
+	    active_cred, file_cred, false));
 }
 
 static int
@@ -3565,7 +3572,7 @@
 	switch (cmd) {
 	case SPACECTL_DEALLOC:
 		error = vn_deallocate_impl(vp, offset, length, flags, ioflag,
-		    active_cred, fp->f_cred);
+		    active_cred, fp->f_cred, true);
 		break;
 	default:
 		panic("vn_fspacectl: unknown cmd %d", cmd);