config/kernel-put-link.m4

   1 dnl #
   2 dnl # Supported symlink APIs
   3 dnl #
   4 AC_DEFUN([ZFS_AC_KERNEL_PUT_LINK], [
   5         dnl #
   6         dnl # 4.5 API change
   7         dnl # get_link() uses delayed done, there is no put_link() interface.
   8         dnl #
   9         ZFS_LINUX_TRY_COMPILE([
  10                 #if !defined(HAVE_GET_LINK_DELAYED)
  11                 #error "Expecting get_link() delayed done"
  12                 #endif
  13         ],[
  14         ],[
  15                 AC_DEFINE(HAVE_PUT_LINK_DELAYED, 1, [iops->put_link() delayed])
  16         ],[
  17                 dnl #
  18                 dnl # 4.2 API change
  19                 dnl # This kernel retired the nameidata structure.
  20                 dnl #
  21                 AC_MSG_CHECKING([whether iops->put_link() passes cookie])
  22                 ZFS_LINUX_TRY_COMPILE([
  23                         #include <linux/fs.h>
  24                         void put_link(struct inode *ip, void *cookie)
  25                             { return; }
  26                         static struct inode_operations
  27                             iops __attribute__ ((unused)) = {
  28                                 .put_link = put_link,
  29                         };
  30                 ],[
  31                 ],[
  32                         AC_MSG_RESULT(yes)
  33                         AC_DEFINE(HAVE_PUT_LINK_COOKIE, 1,
  34                             [iops->put_link() cookie])
  35                 ],[
  36                         dnl #
  37                         dnl # 2.6.32 API
  38                         dnl #
  39                         AC_MSG_RESULT(no)
  40                         AC_MSG_CHECKING(
  41                             [whether iops->put_link() passes nameidata])
  42                         ZFS_LINUX_TRY_COMPILE([
  43                                 #include <linux/fs.h>
  44                                 void put_link(struct dentry *de, struct
  45                                     nameidata *nd, void *ptr) { return; }
  46                                 static struct inode_operations
  47                                     iops __attribute__ ((unused)) = {
  48                                         .put_link = put_link,
  49                                 };
  50                         ],[
  51                         ],[
  52                                 AC_MSG_RESULT(yes)
  53                                 AC_DEFINE(HAVE_PUT_LINK_NAMEIDATA, 1,
  54                                     [iops->put_link() nameidata])
  55                         ],[
  56                                 AC_MSG_ERROR(no; please file a bug report)
  57                         ])
  58                 ])
  59         ])
  60 ])