[Suspend2][ 09/28] [Suspend2] Prepare swapwriter signature.

[Nigel Cunningham <nigel@suspend2.net>]

Set the swapwriter signature to reflect that we have an image and point to
the device and sector where the header proper begins.

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

 kernel/power/suspend_swap.c |   36 ++++++++++++++++++++++++++++++++++++
 1 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/kernel/power/suspend_swap.c b/kernel/power/suspend_swap.c
index 08c4f86..7f16bea 100644
--- a/kernel/power/suspend_swap.c
+++ b/kernel/power/suspend_swap.c
@@ -293,3 +293,39 @@ static int parse_signature(char *header,
 	return type;
 }
 
+/*
+ * prepare_signature
+ */
+
+static int prepare_signature(dev_t bdev, unsigned long block,
+		char *current_header)
+{
+	int current_type = parse_signature(current_header, 0);
+	dev_t *header_ptr = (dev_t *) (&current_header[1]);
+	unsigned long *headerblock_ptr =
+		(unsigned long *) (&current_header[6]);
+
+	if ((current_type > 1) && (current_type < 6))
+		return 1;
+
+	/* At the moment, I don't have a way to handle the block being
+	 * > 32 bits. Not enough room in the signature and no way to
+	 * safely put the data elsewhere. */
+
+	if (BITS_PER_LONG == 64 && ffs(block) > 31) {
+		suspend_prepare_status(DONT_CLEAR_BAR,
+			"Header sector requires 33+ bits. "
+			"Would not be able to resume.");
+		return 1;
+	}
+
+	if (current_type & 1)
+		current_header[0] = 'Z';
+	else
+		current_header[0] = 'z';
+	*header_ptr = bdev;
+	/* prev is the first/last swap page of the resume area */
+	*headerblock_ptr = (unsigned long) block; 
+	return 0;
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net
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