---
title: "packExtent(resource:type:logicalOffset:physicalOffset:length:)"
framework: fskit
role: symbol
role_heading: Instance Method
path: "fskit/fsextentpacker/packextent(resource:type:logicaloffset:physicaloffset:length:)"
---

# packExtent(resource:type:logicalOffset:physicalOffset:length:)

Packs a single extent to send to the kernel.

## Declaration

```swift
func packExtent(resource: FSBlockDeviceResource, type: FSExtentType, logicalOffset: off_t, physicalOffset: off_t, length: Int) -> Bool
```

## Parameters

- `resource`: The resource on which to perform I/O.
- `type`: The type of extent, indicating whether it contains valid data.
- `logicalOffset`: The extent offset within the file, in bytes.
- `physicalOffset`: The extent offset on disk, in bytes.
- `length`: The extent length, in bytes. The maximal valid length is UINT32_MAX.

## Return Value

Return Value A Boolean value that indicates whether the packer can pack more extents.

## See Also

### Packing extents

- [FSExtentType](fskit/fsextenttype.md)