[src/trunk]: src/sys/kern Suspend the mounted file system while updating.

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

details:   https://anonhg.NetBSD.org/src/rev/507fe690949d
branches:  trunk
changeset: 822101:507fe690949d
user:      hannken <hannken%NetBSD.org@localhost>
date:      Wed Mar 01 10:45:24 2017 +0000

description:
Suspend the mounted file system while updating.

diffstat:

 sys/kern/vfs_syscalls.c |  9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diffs (37 lines):

diff -r 2123c116e5bd -r 507fe690949d sys/kern/vfs_syscalls.c
--- a/sys/kern/vfs_syscalls.c   Wed Mar 01 10:44:47 2017 +0000
+++ b/sys/kern/vfs_syscalls.c   Wed Mar 01 10:45:24 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: vfs_syscalls.c,v 1.507 2017/03/01 10:44:47 hannken Exp $       */
+/*     $NetBSD: vfs_syscalls.c,v 1.508 2017/03/01 10:45:24 hannken Exp $       */
 
 /*-
  * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
@@ -70,7 +70,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.507 2017/03/01 10:44:47 hannken Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.508 2017/03/01 10:45:24 hannken Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_fileassoc.h"
@@ -287,6 +287,10 @@
                goto out;
        }
 
+       error = vfs_suspend(mp, 0);
+       if (error)
+               goto out;
+
        mutex_enter(&mp->mnt_updating);
 
        mp->mnt_flag &= ~MNT_OP_FLAGS;
@@ -339,6 +343,7 @@
                        vfs_syncer_remove_from_worklist(mp);
        }
        mutex_exit(&mp->mnt_updating);
+       vfs_resume(mp);
        vfs_unbusy(mp, false, NULL);
 
        if ((error == 0) && !(saved_flags & MNT_EXTATTR) &&