[src/trunk]: src/sys/miscfs/nullfs Set IMNT_MPSAFE before creating the vnode ...

[joerg <joerg%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/9be31be5ef06
branches:  trunk
changeset: 847252:9be31be5ef06
user:      joerg <joerg%NetBSD.org@localhost>
date:      Sun Dec 15 20:30:56 2019 +0000

description:
Set IMNT_MPSAFE before creating the vnode for the root of the
filesystem. Otherwise, it won't be created with VV_MPSAFE and require
the kernel_lock.

diffstat:

 sys/miscfs/nullfs/null_vfsops.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (34 lines):

diff -r ff6918e74ce4 -r 9be31be5ef06 sys/miscfs/nullfs/null_vfsops.c
--- a/sys/miscfs/nullfs/null_vfsops.c   Sun Dec 15 20:30:03 2019 +0000
+++ b/sys/miscfs/nullfs/null_vfsops.c   Sun Dec 15 20:30:56 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: null_vfsops.c,v 1.95 2019/02/20 10:06:00 hannken Exp $ */
+/*     $NetBSD: null_vfsops.c,v 1.96 2019/12/15 20:30:56 joerg Exp $   */
 
 /*
  * Copyright (c) 1999 National Aeronautics & Space Administration
@@ -76,7 +76,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: null_vfsops.c,v 1.95 2019/02/20 10:06:00 hannken Exp $");
+__KERNEL_RCSID(0, "$NetBSD: null_vfsops.c,v 1.96 2019/12/15 20:30:56 joerg Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -140,6 +140,7 @@
        /* Create the mount point. */
        nmp = kmem_zalloc(sizeof(struct null_mount), KM_SLEEP);
        mp->mnt_data = nmp;
+       mp->mnt_iflag |= IMNT_MPSAFE;
 
        /*
         * Make sure that the mount point is sufficiently initialized
@@ -168,7 +169,6 @@
        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
        vp->v_vflag |= VV_ROOT;
        nmp->nullm_rootvp = vp;
-       mp->mnt_iflag |= IMNT_MPSAFE;
        VOP_UNLOCK(vp);
 
        error = set_statvfs_info(path, UIO_USERSPACE, args->la.target,