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From: Andriy Gapon <avg@FreeBSD.org>
Date: Wed, 13 Jul 2016 11:08:51 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org
Subject: svn commit: r302763 -
 stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
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Author: avg
Date: Wed Jul 13 11:08:50 2016
New Revision: 302763
URL: https://svnweb.freebsd.org/changeset/base/302763

Log:
  MFC r300130: zfsctl_freebsd_root_lookup: gfs_vop_lookup may return a
  doomed vnode

Modified:
  stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ctldir.c
Directory Properties:
  stable/9/sys/   (props changed)
  stable/9/sys/cddl/contrib/opensolaris/   (props changed)

Modified: stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ctldir.c
==============================================================================
--- stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ctldir.c	Wed Jul 13 11:06:37 2016	(r302762)
+++ stable/9/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ctldir.c	Wed Jul 13 11:08:50 2016	(r302763)
@@ -600,20 +600,25 @@ zfsctl_freebsd_root_lookup(ap)
 
 	ASSERT(ap->a_cnp->cn_namelen < sizeof(nm));
 	strlcpy(nm, ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen + 1);
-
+relookup:
 	err = zfsctl_root_lookup(dvp, nm, vpp, NULL, 0, NULL, cr, NULL, NULL, NULL);
 	if (err == 0 && (nm[0] != '.' || nm[1] != '\0')) {
-		if (flags & ISDOTDOT)
+		if (flags & ISDOTDOT) {
 			VOP_UNLOCK(dvp, 0);
-		err = vn_lock(*vpp, lkflags);
-		if (err != 0) {
-			vrele(*vpp);
-			*vpp = NULL;
-		}
-		if (flags & ISDOTDOT)
+			err = vn_lock(*vpp, lkflags);
+			if (err != 0) {
+				vrele(*vpp);
+				*vpp = NULL;
+			}
 			vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
+		} else {
+			err = vn_lock(*vpp, LK_EXCLUSIVE);
+			if (err != 0) {
+				VERIFY3S(err, ==, ENOENT);
+				goto relookup;
+			}
+		}
 	}
-
 	return (err);
 }