On Mon, Oct 21, 2019 at 04:03:54PM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebigg...@google.com>
>
> INLINE_CRYPT_OPTIMIZED encryption policies have special requirements
> from the filesystem:
>
> - Inode numbers must never change, even if the filesystem is resized
> - Inode numbers must be <= 32 bits
> - File logical block numbers must be <= 32 bits
You need to guarantee more than this; you also need to guarantee that
the logical block number may not change. Fortunately, because the
original per-file key scheme used a logical block tweak, we've
prohibited this already, and we didn't relax this restriction for
files encrpyted using DIRECT_KEY. So it's a requirement which we
already meet, but we should document this requirement explicitly ---
both here and also in Documentations/filesystems/fscrypt.rst.
Otherwise, looks good. Feel free to add:
Reviewed-by: Theodore Ts'o <ty...@mit.edu>
- Ted
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