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fscrypt: Allow modular crypto algorithms 

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 <herbert@gondor.apana.org.au>
Link: https://lore.kernel.org/r/20191227024700.7vrzuux32uyfdgum@gondor.apana.org.au
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Herbert Xu 2019-12-27 10:47:00 +08:00 committed by Eric Biggers
parent e933adde6f
commit ede7a09fc8
4 changed files with 17 additions and 7 deletions
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21
fs/crypto/Kconfig
View File

@ -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_SKCIPHER
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

1
fs/ext4/Kconfig
View File

@ -39,6 +39,7 @@ config EXT4_FS
select CRYPTO
select CRYPTO_CRC32C
select FS_IOMAP
select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
help
This is the next generation of the ext3 filesystem.

1
fs/f2fs/Kconfig
View File

@ -6,6 +6,7 @@ config F2FS_FS
select CRYPTO
select CRYPTO_CRC32
select F2FS_FS_XATTR if FS_ENCRYPTION
select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
help
F2FS is based on Log-structured File System (LFS), which supports
versatile "flash-friendly" features. The design has been focused on

1
fs/ubifs/Kconfig
View File

@ -12,6 +12,7 @@ config UBIFS_FS
select CRYPTO_ZSTD if UBIFS_FS_ZSTD
select CRYPTO_HASH_INFO
select UBIFS_FS_XATTR if FS_ENCRYPTION
select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
depends on MTD_UBI
help
UBIFS is a file system for flash devices which works on top of UBI.