bcache: New writeback PD controller

[~andy/linux] / drivers / md / bcache / util.c

diff --git a/drivers/md/bcache/util.c b/drivers/md/bcache/util.c
index 462214eeacbedbd9548e725be2e625723cda0d7e..bb37618e76648b7bc3caf99532e4f81b48666dfe 100644 (file)
--- a/drivers/md/bcache/util.c
+++ b/drivers/md/bcache/util.c
@@ -209,7 +209,13 @@ uint64_t bch_next_delay(struct bch_ratelimit *d, uint64_t done)
 {
        uint64_t now = local_clock();
 
-       d->next += div_u64(done, d->rate);
+       d->next += div_u64(done * NSEC_PER_SEC, d->rate);
+
+       if (time_before64(now + NSEC_PER_SEC, d->next))
+               d->next = now + NSEC_PER_SEC;
+
+       if (time_after64(now - NSEC_PER_SEC * 2, d->next))
+               d->next = now - NSEC_PER_SEC * 2;
 
        return time_after64(d->next, now)
                ? div_u64(d->next - now, NSEC_PER_SEC / HZ)