This patch adds an -xid predicate that can be used to find files belonging
to a certain xid.

diff -Naurp findutils-4.1.20.orig/configure.in findutils-4.1.20/configure.in
--- findutils-4.1.20.orig/configure.in	2003-05-26 20:16:09.000000000 +0200
+++ findutils-4.1.20/configure.in	2005-02-20 02:03:27.000000000 +0100
@@ -101,6 +101,10 @@ gl_XALLOC
 dnl internationalization macros
 AM_GNU_GETTEXT
 
+dnl vserver
+AC_CHECK_LIB([vserver], [vc_get_iattr])
+AC_CHECK_TYPES([xid_t, nid_t])
+
 # This is necessary so that .o files in LIBOBJS are also built via
 # the ANSI2KNR-filtering rules.
 #LIBOBJS=`echo $LIBOBJS|sed 's/\.o /\$U.o /g;s/\.o$/\$U.o/'`
diff -Naurp findutils-4.1.20.orig/find/defs.h findutils-4.1.20/find/defs.h
--- findutils-4.1.20.orig/find/defs.h	2003-05-26 15:37:29.000000000 +0200
+++ findutils-4.1.20/find/defs.h	2005-02-20 02:03:06.000000000 +0100
@@ -382,6 +382,9 @@ boolean pred_type PARAMS((char *pathname
 boolean pred_uid PARAMS((char *pathname, struct stat *stat_buf, struct predicate *pred_ptr));
 boolean pred_used PARAMS((char *pathname, struct stat *stat_buf, struct predicate *pred_ptr));
 boolean pred_user PARAMS((char *pathname, struct stat *stat_buf, struct predicate *pred_ptr));
+#ifdef HAVE_LIBVSERVER
+boolean pred_xid PARAMS((char *pathname, struct stat *stat_buf, struct predicate *pred_ptr));
+#endif
 boolean pred_xtype PARAMS((char *pathname, struct stat *stat_buf, struct predicate *pred_ptr));
 char *find_pred_name PARAMS((PFB pred_func));
 #ifdef DEBUG
diff -Naurp findutils-4.1.20.orig/find/parser.c findutils-4.1.20/find/parser.c
--- findutils-4.1.20.orig/find/parser.c	2003-05-24 20:36:25.000000000 +0200
+++ findutils-4.1.20/find/parser.c	2005-02-20 02:04:24.000000000 +0100
@@ -114,6 +114,9 @@ static boolean parse_used PARAMS((char *
 static boolean parse_user PARAMS((char *argv[], int *arg_ptr));
 static boolean parse_version PARAMS((char *argv[], int *arg_ptr));
 static boolean parse_xdev PARAMS((char *argv[], int *arg_ptr));
+#ifdef HAVE_LIBVSERVER
+static boolean parse_xid PARAMS((char *argv[], int *arg_ptr));
+#endif
 static boolean parse_xtype PARAMS((char *argv[], int *arg_ptr));
 
 static boolean insert_regex PARAMS((char *argv[], int *arg_ptr, boolean ignore_case));
@@ -216,6 +219,9 @@ static struct parser_table const parse_t
   {"version", parse_version},	/* GNU */
   {"-version", parse_version},	/* GNU */
   {"xdev", parse_xdev},
+#ifdef HAVE_LIBVSERVER
+  {"xid", parse_xid},		/* vserver */
+#endif
   {"xtype", parse_xtype},	/* GNU */
   {0, 0}
 };
@@ -1202,6 +1208,53 @@ parse_xdev (char **argv, int *arg_ptr)
   return true;
 }
 
+#ifdef HAVE_LIBVSERVER
+#ifndef HAVE_XID_T
+typedef unsigned int xid_t;
+#endif
+#ifndef HAVE_NID_T
+typedef unsigned int nid_t;
+#endif
+#include <vserver.h>
+
+static boolean
+parse_xid (char **argv, int *arg_ptr)
+{
+  const char *ptr, *errstr;
+  xid_t xid;
+  struct predicate *our_pred;
+
+  if (argv == NULL || argv[*arg_ptr] == NULL)
+    return (false);
+
+  our_pred = insert_primary(pred_xid);
+
+  ptr = argv[*arg_ptr];
+  switch (*ptr)
+    {
+    case '+':
+      our_pred->args.info.kind = COMP_GT;
+      ptr++;
+      break;
+    case '-':
+      our_pred->args.info.kind = COMP_LT;
+      ptr++;
+      break;
+    default:
+      our_pred->args.info.kind = COMP_EQ;
+      break;
+    }
+
+  xid = vc_xidopt2xid(ptr, true, &errstr);
+  if (xid == VC_NOCTX)
+    error(1, 0, _("invalid xid %s: %s"), quote(argv[*arg_ptr]), errstr);
+  our_pred->args.info.l_val = xid;
+
+  (*arg_ptr)++;
+  return (true);
+}
+#endif
+
 static boolean
 parse_xtype (char **argv, int *arg_ptr)
 {
diff -Naurp findutils-4.1.20.orig/find/pred.c findutils-4.1.20/find/pred.c
--- findutils-4.1.20.orig/find/pred.c	2003-05-24 20:36:25.000000000 +0200
+++ findutils-4.1.20/find/pred.c	2005-02-20 02:06:08.000000000 +0100
@@ -198,6 +198,9 @@ struct pred_assoc pred_table[] =
   {pred_used, "used    "},
   {pred_user, "user    "},
   {pred_xtype, "xtype   "},
+#ifdef HAVE_LIBVSERVER
+  {pred_xid, "xid     "},
+#endif
   {0, "none    "}
 };
 
@@ -1204,6 +1207,42 @@ pred_user (char *pathname, struct stat *
     return (false);
 }
 
+#ifdef HAVE_LIBVSERVER
+#ifndef HAVE_XID_T
+typedef unsigned int xid_t;
+#endif
+#ifndef HAVE_NID_T
+typedef unsigned int nid_t;
+#endif
+#include <vserver.h>
+
+boolean
+pred_xid (char *pathname, struct stat *stat_buf, struct predicate *pred_ptr)
+{
+  xid_t xid;
+
+  if ((xid = vc_getfilecontext(rel_pathname)) == VC_NOCTX)
+    return (false);
+
+  switch (pred_ptr->args.info.kind)
+    {
+    case COMP_GT:
+      if (xid > pred_ptr->args.info.l_val)
+	return (true);
+      break;
+    case COMP_LT:
+      if (xid < pred_ptr->args.info.l_val)
+	return (true);
+      break;
+    case COMP_EQ:
+      if (xid == pred_ptr->args.info.l_val)
+	return (true);
+      break;
+    }
+  return (false);
+}
+#endif
+
 boolean
 pred_xtype (char *pathname, struct stat *stat_buf, struct predicate *pred_ptr)
 {