unix: add new fscrypt declarations from Linux v5.4

Create Go bindings for the updated fscrypt UAPI from Linux v5.4:

- Various new ioctls.  We use the regex FS_IOC_.*ENCRYPTION to match
  both the new and existing fscrypt ioctls.

- Various new structures for passing to the ioctls

- Various new constants named like FSCRYPT_*

- FscryptPolicy was renamed to FscryptPolicyV1.  (But the old name is
  still available for source compatibility.)

- The existing fscrypt-related constants named like FS_* (besides the
  ioctls) were renamed to FSCRYPT_*.  (But the old names are still
  available for source compatibility.)

For reference, see fscrypt.h:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/uapi/linux/fscrypt.h?h=v5.4

Fixes golang/go#35856

Change-Id: I48ddd37cfa7c1e0e7eb227baa6f220c848ddc880
Reviewed-on: https://go-review.googlesource.com/c/sys/+/208898
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
28 files changed
tree: b2c3c7e36c518697ed6aea12f076904156223da0
  1. .gitattributes
  2. .gitignore
  3. AUTHORS
  4. CONTRIBUTING.md
  5. CONTRIBUTORS
  6. LICENSE
  7. PATENTS
  8. README.md
  9. codereview.cfg
  10. cpu/
  11. go.mod
  12. plan9/
  13. unix/
  14. windows/
README.md

sys

This repository holds supplemental Go packages for low-level interactions with the operating system.

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