[PATCH 6/8] fs crypto: add Makefile and Kconfig

[Jaegeuk Kim]

This patch adds a facility to enable per-file encryption.

Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
 fs/Kconfig         |  2 ++
 fs/Makefile        |  1 +
 fs/crypto/Kconfig  | 16 ++++++++++++++++
 fs/crypto/Makefile |  2 ++
 4 files changed, 21 insertions(+)
 create mode 100644 fs/crypto/Kconfig
 create mode 100644 fs/crypto/Makefile

diff --git a/fs/Kconfig b/fs/Kconfig
index 9adee0d..9d75767 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -84,6 +84,8 @@ config MANDATORY_FILE_LOCKING
 
 	  To the best of my knowledge this is dead code that no one cares about.
 
+source "fs/crypto/Kconfig"
+
 source "fs/notify/Kconfig"
 
 source "fs/quota/Kconfig"
diff --git a/fs/Makefile b/fs/Makefile
index 79f5225..47571e2 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_EVENTFD)		+= eventfd.o
 obj-$(CONFIG_USERFAULTFD)	+= userfaultfd.o
 obj-$(CONFIG_AIO)               += aio.o
 obj-$(CONFIG_FS_DAX)		+= dax.o
+obj-y				+= crypto/
 obj-$(CONFIG_FILE_LOCKING)      += locks.o
 obj-$(CONFIG_COMPAT)		+= compat.o compat_ioctl.o
 obj-$(CONFIG_BINFMT_AOUT)	+= binfmt_aout.o
diff --git a/fs/crypto/Kconfig b/fs/crypto/Kconfig
new file mode 100644
index 0000000..fc5a4f9
--- /dev/null
+++ b/fs/crypto/Kconfig
@@ -0,0 +1,16 @@
+config FS_ENCRYPTION
+	bool "FS Encryption (Per-file encryption)"
+	select CRYPTO_AES
+	select CRYPTO_CBC
+	select CRYPTO_ECB
+	select CRYPTO_XTS
+	select CRYPTO_CTS
+	select CRYPTO_CTR
+	select CRYPTO_SHA256
+	select KEYS
+	select ENCRYPTED_KEYS
+	help
+	  Enable encryption of files and directories.  This
+	  feature is similar to ecryptfs, but it is more memory
+	  efficient since it avoids caching the encrypted and
+	  decrypted pages in the page cache.
diff --git a/fs/crypto/Makefile b/fs/crypto/Makefile
new file mode 100644
index 0000000..f9f68cd
--- /dev/null
+++ b/fs/crypto/Makefile
@@ -0,0 +1,2 @@
+obj-y += fname.o
+obj-$(CONFIG_FS_ENCRYPTION)	+= crypto.o policy.o keyinfo.o
-- 
2.6.3