From 827e334c01052d27298113e871fc35a698dc72e3 Mon Sep 17 00:00:00 2001
From: Kirk McKusick <mckusick@FreeBSD.org>
Date: Sun, 8 Apr 2012 06:18:18 +0000
Subject: [PATCH] Add I/O accounting to msdos filesystem.

Suggested and reviewed by: kib
---
 sys/fs/msdosfs/msdosfs_vfsops.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/fs/msdosfs/msdosfs_vfsops.c b/sys/fs/msdosfs/msdosfs_vfsops.c
index e81c9bfa203..f8eb317fae7 100644
--- a/sys/fs/msdosfs/msdosfs_vfsops.c
+++ b/sys/fs/msdosfs/msdosfs_vfsops.c
@@ -401,6 +401,8 @@ msdosfs_mount(struct mount *mp)
 		return error;
 	}
 
+	if (devvp->v_type == VCHR && devvp->v_rdev != NULL)
+		devvp->v_rdev->si_mountpt = mp;
 	vfs_mountedfrom(mp, from);
 #ifdef MSDOSFS_DEBUG
 	printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap);
@@ -843,6 +845,8 @@ msdosfs_unmount(struct mount *mp, int mntflags)
 	}
 #endif
 	DROP_GIANT();
+	if (pmp->pm_devvp->v_type == VCHR && pmp->pm_devvp->v_rdev != NULL)
+		pmp->pm_devvp->v_rdev->si_mountpt = NULL;
 	g_topology_lock();
 	g_vfs_close(pmp->pm_cp);
 	g_topology_unlock();