From 9260481d50f0758285a0823575874b37738f9284 Mon Sep 17 00:00:00 2001
From: kib <kib@FreeBSD.org>
Date: Sat, 11 Apr 2009 16:12:20 +0000
Subject: When zapping v_cache_dd for !MAKEENTRY case in cache_lookup(), we
 shall lock cache as writer.

Reviewed by:	kan
---
 sys/kern/vfs_cache.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'sys/kern/vfs_cache.c')

diff --git a/sys/kern/vfs_cache.c b/sys/kern/vfs_cache.c
index 6172f5b..8210126 100644
--- a/sys/kern/vfs_cache.c
+++ b/sys/kern/vfs_cache.c
@@ -410,6 +410,8 @@ retry_wlocked:
 				goto unlock;
 			}
 			if ((cnp->cn_flags & MAKEENTRY) == 0) {
+				if (!wlocked && !CACHE_UPGRADE_LOCK())
+					goto wlock;
 				if (dvp->v_cache_dd->nc_flag & NCF_ISDOTDOT)
 					cache_zap(dvp->v_cache_dd);
 				dvp->v_cache_dd = NULL;
-- 
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