---
title: vfs_isforce
framework: Kernel
role: symbol
role_heading: Function
platforms: [macOS 10.4+]
path: kernel/1523525-vfs_isforce
---

# vfs_isforce

Determine if a forced unmount is in progress.

## Declaration

```occ
int vfs_isforce(mount_t mp);
```

## Parameters

- `mp`: Mount to test.

## Return Value

Return Value Nonzero if a request has been made to forcibly unmount, else 0.

## Discussion

Discussion A forced unmount invalidates open files.