27 lines
1.0 KiB
Markdown
27 lines
1.0 KiB
Markdown
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# Linux Kernel Patch
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There are two pieces, the `zstd_compress` and `zstd_decompress` kernel modules, and the BtrFS patch.
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The patches are based off of the linux kernel version 4.9.
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The BtrFS patch is not present in its entirety yet.
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## Zstd Kernel modules
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* The header is in `include/linux/zstd.h`.
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* It is split up into `zstd_compress` and `zstd_decompress`, which can be loaded independently.
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* Source files are in `lib/zstd/`.
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* `lib/Kconfig` and `lib/Makefile` need to be modified by applying `lib/Kconfig.diff` and `lib/Makefile.diff` respectively.
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* `test/UserlandTest.cpp` contains tests for the patch in userland by mocking the kernel headers.
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It can be run with the following commands:
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```
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cd test
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make googletest
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make UserlandTest
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./UserlandTest
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```
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## BtrFS
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* `fs/btrfs/zstd.c` is provided.
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* Some more glue is required to integrate it with BtrFS, but I haven't included the patches yet.
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In the meantime see https://github.com/terrelln/linux/commit/1914f7d4ca6c539369c84853eafa4ac104883047 if you're interested.
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