[Suspend2][ 12/32] [Suspend2] Prepare & cleanup readahead pages.

[Nigel Cunningham <nigel@suspend2.net>]

Allocate and cleanup pages used for readahead.

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

 kernel/power/suspend_block_io.c |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/kernel/power/suspend_block_io.c b/kernel/power/suspend_block_io.c
index f14939e..a1fcacb 100644
--- a/kernel/power/suspend_block_io.c
+++ b/kernel/power/suspend_block_io.c
@@ -414,3 +414,25 @@ static int suspend_readahead_ready(int r
 	return test_bit(bit, &suspend_readahead_flags[index]);
 }
 
+/* suspend_readahead_prepare
+ * Set up for doing readahead on an image */
+static int suspend_prepare_readahead(int index)
+{
+	unsigned long new_page = get_zeroed_page(GFP_ATOMIC);
+
+	if(!new_page)
+		return -ENOMEM;
+
+	suspend_readahead_pages[index] = virt_to_page(new_page);
+	return 0;
+}
+
+/* suspend_readahead_cleanup
+ * Clean up structures used for readahead */
+static void suspend_cleanup_readahead(int page)
+{
+	__free_page(suspend_readahead_pages[page]);
+	suspend_readahead_pages[page] = 0;
+	return;
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net
-
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