Preparation and cleanup routines for doing I/O on a pageset.
Signed-off-by: Nigel Cunningham <[email protected]>
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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