svn commit: r358633 - head/sys/fs/nullfs

[Mateusz Guzik]

Author: mjg
Date: Wed Mar  4 19:52:00 2020
New Revision: 358633
URL: https://svnweb.freebsd.org/changeset/base/358633

Log:
  nullfs: don't pre lock exclusive in nullfs_root
  
  Reviewed by:	kib
  Differential Revision:	https://reviews.freebsd.org/D23955

Modified:
  head/sys/fs/nullfs/null_vfsops.c

Modified: head/sys/fs/nullfs/null_vfsops.c
==============================================================================
--- head/sys/fs/nullfs/null_vfsops.c	Wed Mar  4 18:38:09 2020	(r358632)
+++ head/sys/fs/nullfs/null_vfsops.c	Wed Mar  4 19:52:00 2020	(r358633)
@@ -281,13 +281,10 @@ nullfs_root(mp, flags, vpp)
 	NULLFSDEBUG("nullfs_root(mp = %p, vp = %p)\n", mp,
 	    mntdata->nullm_lowerrootvp);
 
-	error = vget(mntdata->nullm_lowerrootvp, (flags & ~LK_TYPE_MASK) |
-	    LK_EXCLUSIVE, curthread);
+	error = vget(mntdata->nullm_lowerrootvp, flags, curthread);
 	if (error == 0) {
 		error = null_nodeget(mp, mntdata->nullm_lowerrootvp, &vp);
 		if (error == 0) {
-			if ((flags & LK_TYPE_MASK) == LK_SHARED)
-				vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
 			*vpp = vp;
 		}
 	}