[Suspend2][ 05/12] [Suspend2] Prepare to encrypt or decrypt a stream of pages.

[Nigel Cunningham <nigel@suspend2.net>]

This routine adds initialisation code for encrypting or decrypting a stream
of pages in the image.

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

 kernel/power/encryption.c |   34 ++++++++++++++++++++++++++++++++++
 1 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/kernel/power/encryption.c b/kernel/power/encryption.c
index 16a275b..9b7dd93 100644
--- a/kernel/power/encryption.c
+++ b/kernel/power/encryption.c
@@ -204,3 +204,37 @@ static int suspend_encrypt_write_chunk(s
 	return ret;
 }
 
+/* rw_init()
+ *
+ * Description:	Prepare to read a new stream of data.
+ * Arguments:	int: Section of image about to be read.
+ * Returns:	int: Zero on success, error number otherwise.
+ */
+static int suspend_encrypt_rw_init(int rw, int stream_number)
+{
+	int result;
+
+	next_driver = suspend_get_next_filter(&suspend_encryption_ops);
+
+	if (!next_driver) {
+		printk("Encryption Driver: Argh! I'm at the end of the pipeline!");
+		return -ECHILD;
+	}
+	
+	if ((result = suspend_encrypt_rw_prepare(rw))) {
+		set_result_state(SUSPEND_ENCRYPTION_SETUP_FAILED);
+		suspend_encrypt_rw_cleanup(rw);
+		return result;
+	}
+	
+	if ((result = allocate_local_buffer()))
+		return result;
+
+	if (rw == WRITE && stream_number == 2)
+		bytes_in = bytes_out = 0;
+	
+	bufofs = (rw == READ) ? PAGE_SIZE : 0;
+
+	return 0;
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net
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