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From: Mateusz Guzik <mjg@FreeBSD.org>
Date: Sun, 5 Nov 2017 08:31:25 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r325433 - head/sys/kern
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Author: mjg
Date: Sun Nov  5 08:31:25 2017
New Revision: 325433
URL: https://svnweb.freebsd.org/changeset/base/325433

Log:
  namecache: skip locking in cache_purge_negative if there are no entries

Modified:
  head/sys/kern/vfs_cache.c

Modified: head/sys/kern/vfs_cache.c
==============================================================================
--- head/sys/kern/vfs_cache.c	Sun Nov  5 08:20:27 2017	(r325432)
+++ head/sys/kern/vfs_cache.c	Sun Nov  5 08:31:25 2017	(r325433)
@@ -1967,6 +1967,8 @@ cache_purge_negative(struct vnode *vp)
 
 	CTR1(KTR_VFS, "cache_purge_negative(%p)", vp);
 	SDT_PROBE1(vfs, namecache, purge_negative, done, vp);
+	if (LIST_EMPTY(&vp->v_cache_src))
+		return;
 	TAILQ_INIT(&ncps);
 	vlp = VP2VNODELOCK(vp);
 	mtx_lock(vlp);