From 5614170e6eb0a512dd9b15db81e6ff84438748cd Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@newdream.net>
Date: Thu, 21 Aug 2008 11:21:38 -0700
Subject: [PATCH] kclient: fix i_lock/snap_rwsem lock inversion (read, not
 write)

---
 src/kernel/caps.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/kernel/caps.c b/src/kernel/caps.c
index dc563aaf1fd2c..83351b7092a5b 100644
--- a/src/kernel/caps.c
+++ b/src/kernel/caps.c
@@ -454,7 +454,7 @@ ack:
 				dout(10, "inverting snap/in locks on %p\n",
 				     inode);
 				spin_unlock(&inode->i_lock);
-				down_write(&mdsc->snap_rwsem);
+				down_read(&mdsc->snap_rwsem);
 				took_snap_rwsem = 1;
 				goto retry;
 			}
@@ -492,7 +492,7 @@ ack:
 	if (session)
 		mutex_unlock(&session->s_mutex);
 	if (took_snap_rwsem)
-		up_write(&mdsc->snap_rwsem);
+		up_read(&mdsc->snap_rwsem);
 }
 
 
-- 
2.39.5