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fscrypt: Allow modular crypto algorithms

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The commit 643fa9612b ("fscrypt: remove filesystem specific
build config option") removed modular support for fs/crypto.  This
causes the Crypto API to be built-in whenever fscrypt is enabled.
This makes it very difficult for me to test modular builds of
the Crypto API without disabling fscrypt which is a pain.

As fscrypt is still evolving and it's developing new ties with the
fs layer, it's hard to build it as a module for now.

However, the actual algorithms are not required until a filesystem
is mounted.  Therefore we can allow them to be built as modules.

Signed-off-by: Herbert Xu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Eric Biggers <[email protected]>
This commit is contained in:
Herbert Xu 2019-12-27 10:47:00 +08:00 • committed by Jaegeuk Kim
commit 2c330f2fed
4 changed files with 17 additions and 7 deletions
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21
fs/crypto/Kconfig
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@ -2,13 +2,8 @@
config FS_ENCRYPTION
bool "FS Encryption (Per-file encryption)"
select CRYPTO
select CRYPTO_AES
select CRYPTO_CBC
select CRYPTO_ECB
select CRYPTO_XTS
select CRYPTO_CTS
select CRYPTO_SHA512
select CRYPTO_HMAC
select CRYPTO_HASH
select CRYPTO_BLKCIPHER
select KEYS
help
Enable encryption of files and directories. This
@ -16,3 +11,15 @@ config FS_ENCRYPTION
efficient since it avoids caching the encrypted and
decrypted pages in the page cache. Currently Ext4,
F2FS and UBIFS make use of this feature.
# Filesystems supporting encryption must select this if FS_ENCRYPTION. This
# allows the algorithms to be built as modules when all the filesystems are.
config FS_ENCRYPTION_ALGS
tristate
select CRYPTO_AES
select CRYPTO_CBC
select CRYPTO_CTS
select CRYPTO_ECB
select CRYPTO_HMAC
select CRYPTO_SHA512
select CRYPTO_XTS