[Suspend2][ 19/32] [Suspend2] Do i/o on a page.

[Nigel Cunningham <nigel@suspend2.net>]

Perform i/o on a page, possibly waiting for completion.

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

 kernel/power/suspend_block_io.c |   44 +++++++++++++++++++++++++++++++++++++++
 1 files changed, 44 insertions(+), 0 deletions(-)

diff --git a/kernel/power/suspend_block_io.c b/kernel/power/suspend_block_io.c
index 0d01483..555d4fa 100644
--- a/kernel/power/suspend_block_io.c
+++ b/kernel/power/suspend_block_io.c
@@ -722,3 +722,47 @@ static struct io_info *start_one(int rw,
 	return io_info;
 }
 
+static int suspend_do_io(int rw, 
+		struct submit_params *submit_info, int syncio)
+{
+	struct io_info *io_info;
+
+	if(!submit_info->dev) {
+		printk("Suspend_do_io: submit_info->dev is NULL!\n");
+		return 1;
+	}
+	
+	io_info = start_one(rw, submit_info);
+
+	if (!io_info) {
+		printk("Unable to allocate an io_info struct.\n");
+		return 1;
+	} else if (syncio)
+		wait_on_one_page(io_info);
+
+	/* If we were the only one, clean everything up */
+	if (!atomic_read(&outstanding_io))
+		suspend_finish_all_io();
+	return 0;
+} 
+
+/* We used to use bread here, but it doesn't correctly handle
+ * blocksize != PAGE_SIZE. Now we create a submit_info to get the data we
+ * want and use our normal routines (synchronously).
+ */
+
+static int suspend_bdev_page_io(int rw, struct block_device *bdev, long pos,
+		struct page *page)
+{
+	struct submit_params submit_info;
+
+	if (!bdev)
+		return 0;
+
+	submit_info.page = page;
+	submit_info.dev = bdev;
+	submit_info.block[0] = pos;
+	submit_info.readahead_index = -1;
+	return suspend_do_io(rw, &submit_info, 1);
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net