[PATCH 5/6] mds: wake xlock waiter when xlock is done

["Yan, Zheng" <zheng.z.yan@xxxxxxxxx>]

From: "Yan, Zheng" <zheng.z.yan@xxxxxxxxx>

Once a lock is in LOCK_XLOCKDONE state, client already holds xlock
can acquire extra xlock. So wake up xlock waiter when we set lock
state to LOCK_XLOCKDONE.

Signed-off-by: Yan, Zheng <zheng.z.yan@xxxxxxxxx>
---
 src/mds/Locker.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/mds/Locker.cc b/src/mds/Locker.cc
index 47ea6fc..a4b50db 100644
--- a/src/mds/Locker.cc
+++ b/src/mds/Locker.cc
@@ -477,6 +477,7 @@ void Locker::set_xlocks_done(Mutation *mut, bool skip_dentry)
       continue;
     dout(10) << "set_xlocks_done on " << **p << " " << *(*p)->get_parent() << dendl;
     (*p)->set_xlock_done();
+    (*p)->finish_waiters(ScatterLock::WAIT_XLOCK);
   }
 }
 
@@ -1419,7 +1420,7 @@ bool Locker::xlock_start(SimpleLock *lock, MDRequest *mut)
       }
     }
     
-    lock->add_waiter(SimpleLock::WAIT_WR|SimpleLock::WAIT_STABLE, new C_MDS_RetryRequest(mdcache, mut));
+    lock->add_waiter(SimpleLock::WAIT_XLOCK|SimpleLock::WAIT_STABLE, new C_MDS_RetryRequest(mdcache, mut));
     nudge_log(lock);
     return false;
   } else {
-- 
1.8.1.4

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