Describe ubc_purge(9).

share/man/man9/ubc.9

@@ -1,4 +1,4 @@
-.\"	$NetBSD: ubc.9,v 1.6 2010/12/02 12:54:13 wiz Exp $
+.\"	$NetBSD: ubc.9,v 1.7 2011/06/14 00:19:20 rmind Exp $
 .\"
 .\" Copyright (c) 1998 Matthew R. Green
 .\" All rights reserved.
@@ -24,7 +24,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd April 14, 2010
+.Dd June 14, 2011
 .Dt UBC 9
 .Os
 .Sh NAME
@@ -38,7 +38,10 @@
 .Ft void
 .Fn ubc_release "void *va" "int flags"
 .Ft int
-.Fn ubc_uiomove "struct uvm_object *uobj" "struct uio *uio" "vsize_t todo" "int advice" "int flags"
+.Fn ubc_uiomove "struct uvm_object *uobj" "struct uio *uio" "vsize_t todo" \
+ "int advice" "int flags"
+.Ft void
+.Fn ubc_purge "struct uvm_object *uobj"
 .Sh DESCRIPTION
 .Fn ubc_alloc
 creates a kernel mapping of
@@ -113,6 +116,11 @@ Additionally, the flag
 .Dv UBC_PARTIALOK
 can be provided to indicate that it is acceptable to return if an error
 occurs mid-transfer.
+.Pp
+.Fn ubc_purge
+disassociates all UBC structures from an empty UVM object,
+specified by
+.Fa uobj .
 .Sh CODE REFERENCES
 The
 .Nm