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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 <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
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@ -2,13 +2,8 @@
config FS_ENCRYPTION config FS_ENCRYPTION
bool "FS Encryption (Per-file encryption)" bool "FS Encryption (Per-file encryption)"
select CRYPTO select CRYPTO
select CRYPTO_AES select CRYPTO_HASH
select CRYPTO_CBC select CRYPTO_SKCIPHER
select CRYPTO_ECB
select CRYPTO_XTS
select CRYPTO_CTS
select CRYPTO_SHA512
select CRYPTO_HMAC
select KEYS select KEYS
help help
Enable encryption of files and directories. This Enable encryption of files and directories. This
@ -16,3 +11,15 @@ config FS_ENCRYPTION
efficient since it avoids caching the encrypted and efficient since it avoids caching the encrypted and
decrypted pages in the page cache. Currently Ext4, decrypted pages in the page cache. Currently Ext4,
F2FS and UBIFS make use of this feature. 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
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@ -39,6 +39,7 @@ config EXT4_FS
select CRYPTO select CRYPTO
select CRYPTO_CRC32C select CRYPTO_CRC32C
select FS_IOMAP select FS_IOMAP
select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
help help
This is the next generation of the ext3 filesystem. This is the next generation of the ext3 filesystem.

1
fs/f2fs/Kconfig
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@ -6,6 +6,7 @@ config F2FS_FS
select CRYPTO select CRYPTO
select CRYPTO_CRC32 select CRYPTO_CRC32
select F2FS_FS_XATTR if FS_ENCRYPTION select F2FS_FS_XATTR if FS_ENCRYPTION
select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
help help
F2FS is based on Log-structured File System (LFS), which supports F2FS is based on Log-structured File System (LFS), which supports
versatile "flash-friendly" features. The design has been focused on 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_ZSTD if UBIFS_FS_ZSTD
select CRYPTO_HASH_INFO select CRYPTO_HASH_INFO
select UBIFS_FS_XATTR if FS_ENCRYPTION select UBIFS_FS_XATTR if FS_ENCRYPTION
select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
depends on MTD_UBI depends on MTD_UBI
help help
UBIFS is a file system for flash devices which works on top of UBI. UBIFS is a file system for flash devices which works on top of UBI.