[Suspend2][ 10/32] [Suspend2] Wait on readahead.

[Nigel Cunningham]

Wait for the next page of readahead to be complete.

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

 kernel/power/suspend_block_io.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/kernel/power/suspend_block_io.c b/kernel/power/suspend_block_io.c
index f9c883a..ae45fc3 100644
--- a/kernel/power/suspend_block_io.c
+++ b/kernel/power/suspend_block_io.c
@@ -385,3 +385,18 @@ static void wait_on_one_page(struct io_i
 	do { do_bio_wait(3); } while (io_info->flags);
 }
 
+/*
+ * wait_on_readahead
+ *
+ * Wait until a particular readahead is ready.
+ */
+static void suspend_wait_on_readahead(int readahead_index)
+{
+	int index = readahead_index / BITS_PER_LONG;
+	int bit = readahead_index - index * BITS_PER_LONG;
+
+	/* read_ahead_index is the one we want to return */
+	while (!test_bit(bit, &suspend_readahead_flags[index]))
+		do_bio_wait(6);
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net
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