[PATCH 4/4] btrfs: Be smarter when sleeping in transaction_kthread

[Nikolay Borisov <nborisov@suse.com>]

If transaction_kthread is woken up before
btrfs_fs_info::commit_interval seconds have elapsed it will sleep for a
fixed period of 5 seconds. This is not a problem per-se but is not
accuaret, instead the code should sleep for an interval which guarantees
on next wakeup commit_interval would have passed. Since time tracking is
not accurate add 1 second to ensure next wake up would be after
commit_interval.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
---
 fs/btrfs/disk-io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index c5d3e7f75066..a1fe99cf0831 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1735,7 +1735,7 @@ static int transaction_kthread(void *arg)
 		if (cur->state < TRANS_STATE_COMMIT_START &&
 		    delta < fs_info->commit_interval) {
 			spin_unlock(&fs_info->trans_lock);
-			delay = msecs_to_jiffies(5000);
+			delay = msecs_to_jiffies((1+delta) * 1000);
 			goto sleep;
 		}
 		transid = cur->transid;
-- 
2.17.1