From: Mikulas Patocka <mpatocka@redhat.com>
Set the bit that prevents queue plugging --- so that the request goes
immediately to the device.
This makes dm-delay more precise, without the patch, there could be additional
3ms delay.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
---
drivers/md/dm-delay.c | 1 +
1 files changed, 1 insertion(+)
Index: linux/drivers/md/dm-delay.c
===================================================================
--- linux.orig/drivers/md/dm-delay.c 2008-04-17 03:49:44.000000000 +0100
+++ linux/drivers/md/dm-delay.c 2008-05-14 11:43:23.000000000 +0100
@@ -73,6 +73,7 @@ static void flush_bios(struct bio *bio)
while (bio) {
n = bio->bi_next;
bio->bi_next = NULL;
+ bio->bi_flags |= (1 << BIO_RW_SYNC);
generic_make_request(bio);
bio = n;
}