Add .zfs control directory

[zfs.git] / config / kernel-automount.m4

diff --git a/config/kernel-automount.m4 b/config/kernel-automount.m4
new file mode 100644 (file)
index 0000000..972b09b
--- /dev/null
+++ b/config/kernel-automount.m4
@@ -0,0 +1,23 @@
+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 *) = 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)
+       ])
+])