+dnl #
+dnl # Linux 2.6.38 - 3.x API
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_FILE_FALLOCATE], [
+ AC_MSG_CHECKING([whether fops->fallocate() exists])
+ ZFS_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+ ],[
+ long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
+ struct file_operations fops __attribute__ ((unused)) = {
+ .fallocate = fallocate,
+ };
+ ],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
+ ],[
+ AC_MSG_RESULT(no)
+ ])
+])
+
+dnl #
+dnl # Linux 2.6.x - 2.6.37 API
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_INODE_FALLOCATE], [
+ AC_MSG_CHECKING([whether iops->fallocate() exists])
+ ZFS_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+ ],[
+ long (*fallocate) (struct inode *, int, loff_t, loff_t) = NULL;
+ struct inode_operations fops __attribute__ ((unused)) = {
+ .fallocate = fallocate,
+ };
+ ],[
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_INODE_FALLOCATE, 1, [fops->fallocate() exists])
+ ],[
+ AC_MSG_RESULT(no)
+ ])
+])
+
+dnl #
+dnl # The fallocate callback was moved from the inode_operations
+dnl # structure to the file_operations structure.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_FALLOCATE], [
+ ZFS_AC_KERNEL_FILE_FALLOCATE
+ ZFS_AC_KERNEL_INODE_FALLOCATE
+])