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diff --git a/sys/fs/nullfs/null_vnops.c b/sys/fs/nullfs/null_vnops.c
--- a/sys/fs/nullfs/null_vnops.c
+++ b/sys/fs/nullfs/null_vnops.c
@@ -585,12 +585,19 @@
static int
null_stat(struct vop_stat_args *ap)
{
+ struct mount *mp;
+ struct null_mount *xmp;
int error;
if ((error = null_bypass(&ap->a_gen)) != 0)
return (error);
- ap->a_sb->st_dev = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
+ mp = ap->a_vp->v_mount;
+ xmp = MOUNTTONULLMOUNT(mp);
+ ap->a_sb->st_dev = mp->mnt_stat.f_fsid.val[0];
+ if (xmp->nullm_lowerrootvp->v_type != VDIR)
+ ap->a_sb->st_bsdflags |= SFBSD_MNTROOT;
+
return (0);
}
diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -2570,6 +2570,8 @@
}
error = VOP_STAT(nd.ni_vp, sbp, td->td_ucred, NOCRED);
NDFREE_PNBUF(&nd);
+ if (error == 0 && (nd.ni_vp->v_vflag & VV_ROOT) != 0)
+ sbp->st_bsdflags |= SFBSD_MNTROOT;
vput(nd.ni_vp);
#ifdef __STAT_TIME_T_EXT
sbp->st_atim_ext = 0;
diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
--- a/sys/kern/vfs_vnops.c
+++ b/sys/kern/vfs_vnops.c
@@ -1838,6 +1838,8 @@
vn_lock(vp, LK_SHARED | LK_RETRY);
error = VOP_STAT(vp, sb, active_cred, fp->f_cred);
+ if (error == 0 && (vp->v_vflag & VV_ROOT) != 0)
+ sb->st_bsdflags |= SFBSD_MNTROOT;
VOP_UNLOCK(vp);
return (error);
diff --git a/sys/sys/stat.h b/sys/sys/stat.h
--- a/sys/sys/stat.h
+++ b/sys/sys/stat.h
@@ -343,6 +343,7 @@
/* st_bsdflags */
#define SFBSD_NAMEDATTR 0x0001 /* file is named attribute or dir */
+#define SFBSD_MNTROOT 0x0002 /* root of the mount point */
#ifdef _KERNEL
/*

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