osd: add sanity check for scrubs_active counter

To make sure there is no underflow and the scrub logic
works fine.

Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>

diff --git a/src/osd/OSD.cc b/src/osd/OSD.cc
index 1970d47d7fc6f26f39a95eee8eadc7247b754cd5..b46d59b66644bad25f694e58cf656665a248ef65 100644 (file)
--- a/src/osd/OSD.cc
+++ b/src/osd/OSD.cc
@@ -1115,6 +1115,7 @@ void OSDService::dec_scrubs_active()
   dout(20) << "dec_scrubs_active " << scrubs_active << " -> " << (scrubs_active-1)
           << " (max " << cct->_conf->osd_max_scrubs << ", pending " << scrubs_pending << ")" << dendl;
   --scrubs_active;
+  assert(scrubs_active >= 0);
   sched_scrub_lock.Unlock();
 }