config/kernel-vfs-extended-file_range.m4

   1 dnl #
   2 dnl # EL7 have backported copy_file_range and clone_file_range and
   3 dnl # added them to an "extended" file_operations struct.
   4 dnl #
   5 dnl # We're testing for both functions in one here, because they will only
   6 dnl # ever appear together and we don't want to match a similar method in
   7 dnl # some future vendor kernel.
   8 dnl #
   9 AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_FILE_OPERATIONS_EXTEND], [
  10         ZFS_LINUX_TEST_SRC([vfs_file_operations_extend], [
  11                 #include <linux/fs.h>
  12
  13                 static ssize_t test_copy_file_range(struct file *src_file,
  14                     loff_t src_off, struct file *dst_file, loff_t dst_off,
  15                     size_t len, unsigned int flags) {
  16                         (void) src_file; (void) src_off;
  17                         (void) dst_file; (void) dst_off;
  18                         (void) len; (void) flags;
  19                         return (0);
  20                 }
  21
  22                 static int test_clone_file_range(struct file *src_file,
  23                     loff_t src_off, struct file *dst_file, loff_t dst_off,
  24                     u64 len) {
  25                         (void) src_file; (void) src_off;
  26                         (void) dst_file; (void) dst_off;
  27                         (void) len;
  28                         return (0);
  29                 }
  30
  31                 static const struct file_operations_extend
  32                     fops __attribute__ ((unused)) = {
  33                         .kabi_fops = {},
  34                         .copy_file_range = test_copy_file_range,
  35                         .clone_file_range = test_clone_file_range,
  36                 };
  37         ],[])
  38 ])
  39 AC_DEFUN([ZFS_AC_KERNEL_VFS_FILE_OPERATIONS_EXTEND], [
  40         AC_MSG_CHECKING([whether file_operations_extend takes \
  41 .copy_file_range() and .clone_file_range()])
  42         ZFS_LINUX_TEST_RESULT([vfs_file_operations_extend], [
  43                 AC_MSG_RESULT([yes])
  44                 AC_DEFINE(HAVE_VFS_FILE_OPERATIONS_EXTEND, 1,
  45                     [file_operations_extend takes .copy_file_range()
  46                     and .clone_file_range()])
  47         ],[
  48                 AC_MSG_RESULT([no])
  49         ])
  50 ])