[src/trunk]: src/sys/kern Take fstrans_start before syncing a file system.

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

details:   https://anonhg.NetBSD.org/src/rev/e25732153f04
branches:  trunk
changeset: 821782:e25732153f04
user:      hannken <hannken%NetBSD.org@localhost>
date:      Fri Feb 17 08:26:07 2017 +0000

description:
Take fstrans_start before syncing a file system.

diffstat:

 sys/kern/vfs_syscalls.c |  7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diffs (42 lines):

diff -r 4a47d246f2ec -r e25732153f04 sys/kern/vfs_syscalls.c
--- a/sys/kern/vfs_syscalls.c   Fri Feb 17 08:25:15 2017 +0000
+++ b/sys/kern/vfs_syscalls.c   Fri Feb 17 08:26:07 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: vfs_syscalls.c,v 1.505 2016/07/31 20:34:04 dholland Exp $      */
+/*     $NetBSD: vfs_syscalls.c,v 1.506 2017/02/17 08:26:07 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 1.505 2016/07/31 20:34:04 dholland Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.506 2017/02/17 08:26:07 hannken Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_fileassoc.h"
@@ -87,6 +87,7 @@
 #include <sys/stat.h>
 #include <sys/vnode.h>
 #include <sys/mount.h>
+#include <sys/fstrans.h>
 #include <sys/proc.h>
 #include <sys/uio.h>
 #include <sys/kmem.h>
@@ -638,6 +639,7 @@
                if (vfs_busy(mp, &nmp)) {
                        continue;
                }
+               fstrans_start(mp, FSTRANS_SHARED);
                mutex_enter(&mp->mnt_updating);
                if ((mp->mnt_flag & MNT_RDONLY) == 0) {
                        asyncflag = mp->mnt_flag & MNT_ASYNC;
@@ -647,6 +649,7 @@
                                 mp->mnt_flag |= MNT_ASYNC;
                }
                mutex_exit(&mp->mnt_updating);
+               fstrans_done(mp);
                vfs_unbusy(mp, false, &nmp);
        }
        mutex_exit(&mountlist_lock);