Add filesystem allocation support - #1742
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@Schamper and other reviewers, any chance you can fast-track the review of this PR, as well as fox-it/dissect.extfs#52 and fox-it/dissect.ntfs#58? The dependency-chain gives us quite a headache and prevents us from building on top of this. If you think it will be a while that's also okay but then we know we'll have to work around it for now. |
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This pull requests adds support for distinguishing which parts of a filesystem are in use and which ones are not.
Filesystemclasses can implement a few functions that yield unallocated or allocated streams, or a tuple containing one stream for each.The PR includes implementations of these functions for NTFS and EXTFS. They depend on functionality added in fox-it/dissect.ntfs#58 and fox-it/dissect.extfs#52 which themselves depend on fox-it/dissect.util#127 .
We have added one small extension to
target-mountto expose the different streams when filesystems support it.In the future we hope more scraping functionality can use the distinction between the allocated/unallocated space. In particular we were thinking about #1329. It would be nice to have one function that can assemble streams for scraping while taking some preferences into account (in this case, allocated only, unallocated only, or don't care).
create_streamsseems to be a good candidate.