--- a/libdiskfs/diskfs.h
+++ b/libdiskfs/diskfs.h
@@ -553,6 +553,9 @@
    DISKFS_READONLY true.  */
 error_t diskfs_node_reload (struct node *node);
 
+/* The user may define this function.  */
+error_t diskfs_pathconf (struct node *np, int name, int *value);
+
 /* If this function is nonzero (and diskfs_shortcut_symlink is set) it
    is called to set a symlink.  If it returns EINVAL or isn't set,
    then the normal method (writing the contents into the file data) is
--- /dev/null
+++ b/libdiskfs/pathconf.c
@@ -0,0 +1,8 @@
+#include "priv.h"
+
+error_t
+diskfs_pathconf (struct node *np, int name, int *value)
+{
+  return EINVAL;
+}
+
--- a/libdiskfs/io-pathconf.c
+++ b/libdiskfs/io-pathconf.c
@@ -30,6 +30,10 @@
   if (!cred)
     return EOPNOTSUPP;
 
+  error_t err = diskfs_pathconf (cred->po->np, name, value);
+  if (err != EINVAL)
+    return err;
+
   switch (name)
     {
     case _PC_LINK_MAX:
--- a/tmpfs/tmpfs.c
+++ b/tmpfs/tmpfs.c
@@ -98,6 +98,22 @@
   return 0;
 }
 
+error_t
+diskfs_pathconf (struct node *np, int name, int *value)
+{
+  switch (name)
+    {
+    case _PC_2_SYMLINKS:
+      *value = 1;
+      break;
+
+    default:
+      return EINVAL;
+    }
+
+  return 0;
+}
+
 int diskfs_synchronous = 0;
 
 static const struct argp_option options[] =
--- a/libdiskfs/Makefile
+++ b/libdiskfs/Makefile
@@ -51,7 +51,7 @@
 	remount.c console.c disk-pager.c \
 	name-cache.c direnter.c dirrewrite.c dirremove.c lookup.c dead-name.c \
 	validate-mode.c validate-group.c validate-author.c validate-flags.c \
-	validate-rdev.c validate-owner.c extra-version.c
+	validate-rdev.c validate-owner.c extra-version.c pathconf.c
 SRCS = $(OTHERSRCS) $(FSSRCS) $(IOSRCS) $(FSYSSRCS) $(IFSOCKSRCS)
 installhdrs = diskfs.h diskfs-pager.h