mirror_zfs/config/kernel-automount.m4
Massimo Maggi 52cd92022e Fix snapshot automounting with GrSecurity constify plugin.
./configure erroneously detects absence of dops->d_automount
when built against a GrSecurity patched kernel.

Summerized error message found in config.log:

  checking whether dops->d_automount() exists
  ...
  In function 'main': ... error: constified variable 'dops'
  cannot be local

The "dops" variable cannot be a local variable, so it's
moved to the global scope.

This test also fails if the prototype of the dops->d_automount
function pointer is changed.

Signed-off-by: Massimo Maggi <massimo@mmmm.it>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Richard Yao <ryao@cs.stonybrook.edu>
Closes #884
2012-08-24 08:56:38 -07:00

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dnl #
dnl # 2.6.37 API change
dnl # The dops->d_automount() dentry operation was added as a clean
dnl # solution to handling automounts. Prior to this cifs/nfs clients
dnl # which required automount support would abuse the follow_link()
dnl # operation on directories for this purpose.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_AUTOMOUNT], [
AC_MSG_CHECKING([whether dops->d_automount() exists])
ZFS_LINUX_TRY_COMPILE([
#include <linux/dcache.h>
struct vfsmount *d_automount(struct path *p) { return NULL; }
struct dentry_operations dops __attribute__ ((unused)) = {
.d_automount = d_automount,
};
],[
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_AUTOMOUNT, 1, [dops->automount() exists])
],[
AC_MSG_RESULT(no)
])
])