D59910.id187784.diff
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	diff --git a/lib/libsys/stat.2 b/lib/libsys/stat.2
	--- a/lib/libsys/stat.2
	+++ b/lib/libsys/stat.2
	@@ -365,6 +365,10 @@
	.Bl -tag -width indent
	.It Dv SFBSD_NAMEDATTR
	The file is a named attribute or a named attribute directory.
	+.It Dv SFBSD_MNTPOINT
	+The file is a mount point.
	+The reported file attributes describe the root node of the file system
	+mounted on it.
	.El
	.Sh RETURN VALUES
	.Rv -std
	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_MNTPOINT;
	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_MNTPOINT;
	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_MNTPOINT 0x0002 /* file is a mount point */

	#ifdef _KERNEL
	/*