config/kernel-dentry-operations.m4

   1 dnl #
   2 dnl # 3.6 API change
   3 dnl #
   4 AC_DEFUN([ZFS_AC_KERNEL_D_REVALIDATE_NAMEIDATA], [
   5         AC_MSG_CHECKING([whether dops->d_revalidate() takes struct nameidata])
   6         ZFS_LINUX_TRY_COMPILE([
   7                 #include <linux/dcache.h>
   8                 #include <linux/sched.h>
   9
  10                 int revalidate (struct dentry *dentry,
  11                     struct nameidata *nidata) { return 0; }
  12
  13                 static const struct dentry_operations
  14                     dops __attribute__ ((unused)) = {
  15                         .d_revalidate   = revalidate,
  16                 };
  17         ],[
  18         ],[
  19                 AC_MSG_RESULT(yes)
  20                 AC_DEFINE(HAVE_D_REVALIDATE_NAMEIDATA, 1,
  21                           [dops->d_revalidate() operation takes nameidata])
  22         ],[
  23                 AC_MSG_RESULT(no)
  24         ])
  25 ])
  26
  27 dnl #
  28 dnl # 2.6.30 API change
  29 dnl # The 'struct dentry_operations' was constified in the dentry structure.
  30 dnl #
  31 AC_DEFUN([ZFS_AC_KERNEL_CONST_DENTRY_OPERATIONS], [
  32         AC_MSG_CHECKING([whether dentry uses const struct dentry_operations])
  33         ZFS_LINUX_TRY_COMPILE([
  34                 #include <linux/dcache.h>
  35
  36                 const struct dentry_operations test_d_op = {
  37                         .d_revalidate = NULL,
  38                 };
  39         ],[
  40                 struct dentry d __attribute__ ((unused));
  41
  42                 d.d_op = &test_d_op;
  43         ],[
  44                 AC_MSG_RESULT(yes)
  45                 AC_DEFINE(HAVE_CONST_DENTRY_OPERATIONS, 1,
  46                           [dentry uses const struct dentry_operations])
  47         ],[
  48                 AC_MSG_RESULT(no)
  49         ])
  50 ])
  51
  52 dnl #
  53 dnl # 2.6.38 API change
  54 dnl # Added d_set_d_op() helper function.
  55 dnl #
  56 AC_DEFUN([ZFS_AC_KERNEL_D_SET_D_OP],
  57         [AC_MSG_CHECKING([whether d_set_d_op() is available])
  58         ZFS_LINUX_TRY_COMPILE_SYMBOL([
  59                 #include <linux/dcache.h>
  60         ], [
  61                 d_set_d_op(NULL, NULL);
  62         ], [d_set_d_op], [fs/dcache.c], [
  63                 AC_MSG_RESULT(yes)
  64                 AC_DEFINE(HAVE_D_SET_D_OP, 1,
  65                           [d_set_d_op() is available])
  66         ], [
  67                 AC_MSG_RESULT(no)
  68         ])
  69 ])
  70
  71 dnl #
  72 dnl # 2.6.38 API chage
  73 dnl # Added sb->s_d_op default dentry_operations member
  74 dnl #
  75 AC_DEFUN([ZFS_AC_KERNEL_S_D_OP],
  76         [AC_MSG_CHECKING([whether super_block has s_d_op])
  77         ZFS_LINUX_TRY_COMPILE([
  78                 #include <linux/fs.h>
  79         ],[
  80                 struct super_block sb __attribute__ ((unused));
  81                 sb.s_d_op = NULL;
  82         ], [
  83                 AC_MSG_RESULT(yes)
  84                 AC_DEFINE(HAVE_S_D_OP, 1, [struct super_block has s_d_op])
  85         ], [
  86                 AC_MSG_RESULT(no)
  87         ])
  88 ])