[Suspend2][ 27/32] [Suspend2] Init and cleanup routines for pageset i/o.

[Nigel Cunningham]

Preparation and cleanup routines for doing I/O on a pageset.

Signed-off-by: Nigel Cunningham <nigel@xxxxxxxxxxxx>

 kernel/power/suspend_block_io.c |   37 +++++++++++++++++++++++++++++++++++++
 1 files changed, 37 insertions(+), 0 deletions(-)

diff --git a/kernel/power/suspend_block_io.c b/kernel/power/suspend_block_io.c
index c095eac..374a861 100644
--- a/kernel/power/suspend_block_io.c
+++ b/kernel/power/suspend_block_io.c
@@ -919,3 +919,40 @@ wait:
 	return 0;
 }
 
+static int suspend_rw_init(int rw, int stream_number)
+{
+	suspend_extent_state_restore(&suspend_writer_posn,
+			&suspend_writer_posn_save[stream_number]);
+	current_stream = stream_number;
+
+	BUG_ON(!suspend_writer_posn.current_extent);
+
+	suspend_reset_io_stats();
+
+	readahead_index = readahead_submit_index = -1;
+
+	return 0;
+}
+
+static int suspend_rw_cleanup(int rw)
+{
+	if (rw == WRITE && current_stream == 2)
+		suspend_extent_state_save(&suspend_writer_posn,
+				&suspend_writer_posn_save[1]);
+	
+	suspend_finish_all_io();
+	
+	if (rw == READ) {
+		while (readahead_index != readahead_submit_index) {
+			suspend_cleanup_readahead(readahead_index);
+			readahead_index++;
+			if (readahead_index == MAX_OUTSTANDING_IO)
+				readahead_index = 0;
+		}
+	}
+
+	suspend_check_io_stats();
+
+	return 0;
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net
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