[Suspend2][ 2/9] [Suspend2] Extent allocation routines.

[Nigel Cunningham <nigel@suspend2.net>]

Add routines to get and put extents.

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

 kernel/power/extent.c |   30 ++++++++++++++++++++++++++++++
 1 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/kernel/power/extent.c b/kernel/power/extent.c
index 4027bb1..2fb6a23 100644
--- a/kernel/power/extent.c
+++ b/kernel/power/extent.c
@@ -17,3 +17,33 @@
 
 int suspend_extents_allocated = 0;
 
+/* suspend_get_extent
+ *
+ * Returns a free extent. May fail, returning NULL instead.
+ */
+static struct extent *suspend_get_extent(void)
+{
+	struct extent *result;
+	
+	if (!(result = kmalloc(sizeof(struct extent), GFP_ATOMIC)))
+		return NULL;
+
+	suspend_extents_allocated++;
+	result->minimum = result->maximum = 0;
+	result->next = NULL;
+
+	return result;
+}
+
+/* suspend_put_extent.
+ *
+ * Frees an extent. Assumes unlinking is done by the caller.
+ */
+void suspend_put_extent(struct extent *extent)
+{
+	BUG_ON(!extent);
+
+	kfree(extent);
+	suspend_extents_allocated--;
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net
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