drbd: fix stalled resync detection in /proc/drbd

If we don't make resync or verify progress for "too long",
we want to flag it as "stalled".

Since 2010, "use rolling marks for resync speed calculation"
this "too long" was wrong by a factor of HZ.
With HZ 250, it would have been flagged as stalled
after 100 minutes.

Hardcode 3 minutes instead.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/block/drbd/drbd_proc.c b/drivers/block/drbd/drbd_proc.c
index 2f26e8ffa45b0fa8348dba8f1823ee4e1753c161..89736bdbbc7044aedaaacbd5dc9c858ca3933596 100644 (file)
--- a/drivers/block/drbd/drbd_proc.c
+++ b/drivers/block/drbd/drbd_proc.c
@@ -116,7 +116,7 @@ static void drbd_syncer_progress(struct drbd_device *device, struct seq_file *se
        /* ------------------------ ~18s average ------------------------ */
        i = (device->rs_last_mark + 2) % DRBD_SYNC_MARKS;
        dt = (jiffies - device->rs_mark_time[i]) / HZ;
-       if (dt > (DRBD_SYNC_MARK_STEP * DRBD_SYNC_MARKS))
+       if (dt > 180)
                stalled = 1;
 
        if (!dt)