Enable CONFIG_FS_ENCRYPTION in kernel 5.15

[larvacea]

Description of changes:

Enable CONFIG_FS_ENCRYPTION in 5.15. This is already enabled in the 5.10 and 6.1 kernel configs.

Testing done:

Sonobuoy

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.

[bcressey]

Can you post the usual kernel config diff in the testing results?

[larvacea]

The config diffs:

==> configs_config-fs-encryption/config-aarch64-aws-k8s-1.26-diff <==
 FS_ENCRYPTION n -> y
+FS_ENCRYPTION_ALGS y
+FS_ENCRYPTION_INLINE_CRYPT n

==> configs_config-fs-encryption/config-x86_64-aws-k8s-1.26-diff <==
 FS_ENCRYPTION n -> y
+FS_ENCRYPTION_ALGS y
+FS_ENCRYPTION_INLINE_CRYPT n

I could also enable FS_ENCRYPTION_INLINE_CRYPT (we have the prerequisite block-device inline encryption configuration selected). Opinions? My inclination is yes.

[yeazelm]

I'm not sure if anything will actually be able to use FS_ENCRYPTION_INLINE_CRYPT but I'm fine enabling it if that keeps 5.15 and 6.1 consistent on these configs.

[larvacea]

The new and improved config diffs:

==> configs_config-fs-encryption/config-aarch64-aws-k8s-1.23-diff <==

==> configs_config-fs-encryption/config-aarch64-aws-k8s-1.26-diff <==
 FS_ENCRYPTION n -> y
+FS_ENCRYPTION_ALGS y
+FS_ENCRYPTION_INLINE_CRYPT y

==> configs_config-fs-encryption/config-x86_64-aws-k8s-1.23-diff <==

==> configs_config-fs-encryption/config-x86_64-aws-k8s-1.26-diff <==
 FS_ENCRYPTION n -> y
+FS_ENCRYPTION_ALGS y
+FS_ENCRYPTION_INLINE_CRYPT y

==> configs_config-fs-encryption/config-x86_64-metal-k8s-1.26-diff <==

==> configs_config-fs-encryption/config-x86_64-vmware-k8s-1.26-diff <==

CONFIG_FS_ENCRYPTION_INLINE_CRYPT permits filesystem encryption to use inline (hardware) block device encryption when it is available. Our 5.15 and 6.1 kernels enable the prerequisite block device encryption:

CONFIG_BLK_INLINE_ENCRYPTION=y

The 5.10 kernel does not (and therefore can't enable CONFIG_FS_ENCRYPTION_INLINE_CRYPT).

[yeazelm]

LGTM!