config/kernel-follow-link-nameidata.m4

   1 dnl #
   2 dnl # 4.2 API change
   3 dnl # This kernel retired the nameidata structure which forced the
   4 dnl # restructuring of the follow_link() prototype and how it is called.
   5 dnl # We check for the new interface rather than detecting the old one.
   6 dnl #
   7 AC_DEFUN([ZFS_AC_KERNEL_FOLLOW_LINK], [
   8         AC_MSG_CHECKING([whether iops->follow_link() passes nameidata])
   9         ZFS_LINUX_TRY_COMPILE([
  10                 #include <linux/fs.h>
  11                 const char *follow_link(struct dentry *de, void **cookie)
  12                     { return "symlink"; }
  13                 static struct inode_operations iops __attribute__ ((unused)) = {
  14                         .follow_link = follow_link,
  15                 };
  16         ],[
  17         ],[
  18                 AC_MSG_RESULT(no)
  19         ],[
  20                 AC_MSG_RESULT(yes)
  21                 AC_DEFINE(HAVE_FOLLOW_LINK_NAMEIDATA, 1,
  22                           [iops->follow_link() nameidata])
  23         ])
  24 ])