---
title: vfs_update_vfsstat
framework: Kernel
role: symbol
role_heading: Function
platforms: [macOS 10.4+]
path: kernel/1523278-vfs_update_vfsstat
---

# vfs_update_vfsstat

Update cached filesystem status information in the VFS mount structure.

## Declaration

```occ
int vfs_update_vfsstat(mount_t mp, vfs_context_t ctx, int eventtype);
```

## Parameters

- `mp`: Mount for which to update cached status information.
- `ctx`: Context to authenticate against for call down to filesystem.
- `eventtype`: VFS_USER_EVENT: need for update is driven by user-level request; perform additional authentication. VFS_KERNEL_EVENT: need for update is driven by in-kernel events. Skip extra authentication.

## Return Value

Return Value 0 for success, or an error code for authentication failure or problem with call to filesystem to request information.

## Discussion

Discussion Each filesystem has a struct vfsstatfs associated with it which is updated as events occur; this function updates it so that the structure pointer returned by vfs_statfs() returns a pointer to fairly recent data.