BACKPORT: FROMLIST: block: blk-crypto for Inline Encryption
We introduce blk-crypto, which manages programming keyslots for struct bios. With blk-crypto, filesystems only need to call bio_crypt_set_ctx with the encryption key, algorithm and data_unit_num; they don't have to worry about getting a keyslot for each encryption context, as blk-crypto handles that. Blk-crypto also makes it possible for layered devices like device mapper to make use of inline encryption hardware. Blk-crypto delegates crypto operations to inline encryption hardware when available, and also contains a software fallback to the kernel crypto API. For more details, refer to Documentation/block/inline-encryption.rst. Bug: 137270441 Test: tested as series; see I26aac0ac7845a9064f28bb1421eb2522828a6dec Change-Id: I6a98e518e5de50f1d4110441568ecd142a02e900 Signed-off-by:Satya Tangirala <satyat@google.com> Link: https://patchwork.kernel.org/patch/11214731/
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