---
title: vfs_init_io_attributes
framework: Kernel
role: symbol
role_heading: Function
platforms: [macOS 10.6+]
path: kernel/1523109-vfs_init_io_attributes
---

# vfs_init_io_attributes

Set I/O attributes on a mountpoint based on device properties.

## Declaration

```occ
int vfs_init_io_attributes(vnode_t devvp, mount_t mp);
```

## Parameters

- `devvp`: Block device vnode from which a filesystem is being mounted.
- `mp`: Mountpoint whose I/O parameters to initialize.

## Return Value

Return Value 0 for success, else an error code.