doc: ReSTify keys-ecryptfs.txt

Adjusts for ReST markup and moves under keys security devel index.

Cc: David Howells <dhowells@redhat.com>
Cc: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/security/00-INDEX

@@ -1,7 +1,5 @@
 00-INDEX
 	- this file.
-keys-ecryptfs.txt
-	- description of the encryption keys for the ecryptfs filesystem.
 keys-request-key.txt
 	- description of the kernel key request service.
 keys-trusted-encrypted.txt

Documentation/security/keys/ecryptfs.rst

@@ -1,4 +1,6 @@
+==========================================
 Encrypted keys for the eCryptfs filesystem
+==========================================
 
 ECryptfs is a stacked filesystem which transparently encrypts and decrypts each
 file using a randomly generated File Encryption Key (FEK).
@@ -35,11 +37,14 @@ controlled environment.  Another advantage is that the key is not exposed to
 threats of malicious software, because it is available in clear form only at
 kernel level.
 
-Usage:
+Usage::
+
    keyctl add encrypted name "new ecryptfs key-type:master-key-name keylen" ring
    keyctl add encrypted name "load hex_blob" ring
    keyctl update keyid "update key-type:master-key-name"
 
+Where::
+
 	name:= '<16 hexadecimal characters>'
 	key-type:= 'trusted' | 'user'
 	keylen:= 64
@@ -48,7 +53,7 @@ keylen:= 64
 Example of encrypted key usage with the eCryptfs filesystem:
 
 Create an encrypted key "1000100010001000" of length 64 bytes with format
-'ecryptfs' and save it using a previously loaded user key "test":
+'ecryptfs' and save it using a previously loaded user key "test"::
 
     $ keyctl add encrypted 1000100010001000 "new ecryptfs user:test 64" @u
     19184530
@@ -62,7 +67,7 @@ Create an encrypted key "1000100010001000" of length 64 bytes with format
     $ keyctl pipe 19184530 > ecryptfs.blob
 
 Mount an eCryptfs filesystem using the created encrypted key "1000100010001000"
-into the '/secret' directory:
+into the '/secret' directory::
 
     $ mount -i -t ecryptfs -oecryptfs_sig=1000100010001000,\
       ecryptfs_cipher=aes,ecryptfs_key_bytes=32 /secret /secret

Documentation/security/keys/index.rst

@@ -6,3 +6,4 @@ Kernel Keys
    :maxdepth: 1
 
    core
+   ecryptfs