[Suspend2][ 20/32] [Suspend2] Return memory needed for block io.

[Nigel Cunningham <nigel@suspend2.net>]

Return the maximum amount of memory needed for block io.

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

 kernel/power/suspend_block_io.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/kernel/power/suspend_block_io.c b/kernel/power/suspend_block_io.c
index 555d4fa..6e0f22c 100644
--- a/kernel/power/suspend_block_io.c
+++ b/kernel/power/suspend_block_io.c
@@ -766,3 +766,12 @@ static int suspend_bdev_page_io(int rw, 
 	return suspend_do_io(rw, &submit_info, 1);
 }
 
+static unsigned long suspend_bio_memory_needed(void)
+{
+	/* We want to have at least enough memory so as to have
+	 * MAX_OUTSTANDING_IO transactions on the fly at once. If we 
+	 * can to more, fine. */
+	return (MAX_OUTSTANDING_IO * (PAGE_SIZE + sizeof(struct request) +
+				sizeof(struct bio) + sizeof(struct io_info)));
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net
-
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