[Suspend2][ 23/32] [Suspend2] Advance one page in the extent state.

[Nigel Cunningham <nigel@suspend2.net>]

Advance one page in the list of devices and blocks (extent state).

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

 kernel/power/suspend_block_io.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/kernel/power/suspend_block_io.c b/kernel/power/suspend_block_io.c
index fbce186..fdbbe4b 100644
--- a/kernel/power/suspend_block_io.c
+++ b/kernel/power/suspend_block_io.c
@@ -796,3 +796,22 @@ static int forward_extra_blocks(void)
 	return 0;
 }
 
+static int forward_one_page(void)
+{
+	int at_start = (suspend_writer_posn.current_chain == -1);
+
+	/* Have to go forward one to ensure we're on the right chain,
+	 * before we can know how many more blocks to skip.*/
+	suspend_extent_state_next(&suspend_writer_posn);
+
+	if (!at_start)
+		if (forward_extra_blocks())
+			return -ENODATA;
+
+	if (extra_page_forward) {
+		extra_page_forward = 0;
+		return forward_one_page();
+	}
+
+	return 0;
+}

--
Nigel Cunningham		nigel at suspend2 dot net
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