f2fs crypto: add f2fs encryption Kconfig

This patch adds f2fs encryption config.

This patch integrates:

"ext4 crypto: require CONFIG_CRYPTO_CTR if ext4 encryption is enabled

On arm64 this is apparently needed for CTS mode to function correctly.
Otherwise attempts to use CTS return ENOENT."

Signed-off-by: Michael Halcrow <mhalcrow@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/Kconfig b/fs/f2fs/Kconfig
index 05f0f66..c629762 100644 (file)
--- a/fs/f2fs/Kconfig
+++ b/fs/f2fs/Kconfig
@@ -72,6 +72,25 @@ config F2FS_CHECK_FS
 
          If you want to improve the performance, say N.
 
+config F2FS_FS_ENCRYPTION
+       bool "F2FS Encryption"
+       depends on F2FS_FS
+       depends on F2FS_FS_XATTR
+       select CRYPTO_AES
+       select CRYPTO_CBC
+       select CRYPTO_ECB
+       select CRYPTO_XTS
+       select CRYPTO_CTS
+       select CRYPTO_CTR
+       select CRYPTO_SHA256
+       select KEYS
+       select ENCRYPTED_KEYS
+       help
+         Enable encryption of f2fs files and directories.  This
+         feature is similar to ecryptfs, but it is more memory
+         efficient since it avoids caching the encrypted and
+         decrypted pages in the page cache.
+
 config F2FS_IO_TRACE
        bool "F2FS IO tracer"
        depends on F2FS_FS