Extents are supported in:
- SGI XFS (in the realtime chunk, which is currently labeled "EXPERIMENTAL" in the Linux version of XFS)
- Reiser4 (in "extents" mode)
- VxFS (via the preallocation API and CLI).
- NTFS (via the preallocation API, namely SetEndOfFile and SetFileValidData functions)
- Universal Disk Format
Note that a file system can be extent-based (i.e., addressing via extents rather than in single blocks) without requiring that each file be limited to a single, contiguous extent.
See also
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