Linux 3.5 compat, iops->truncate_range() removed

[zfs.git] / config / kernel-truncate-range.m4

diff --git a/config/kernel-truncate-range.m4 b/config/kernel-truncate-range.m4
new file mode 100644 (file)
index 0000000..da2cb50
--- /dev/null
+++ b/config/kernel-truncate-range.m4
@@ -0,0 +1,24 @@
+dnl #
+dnl # 3.5.0 API change
+dnl # torvalds/linux@17cf28afea2a1112f240a3a2da8af883be024811 removed
+dnl # truncate_range(). The file hole punching functionality is now
+dnl # provided by fallocate()
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_TRUNCATE_RANGE], [
+       AC_MSG_CHECKING([whether iops->truncate_range() exists])
+       ZFS_LINUX_TRY_COMPILE([
+               #include <linux/fs.h>
+               void truncate_range(struct inode *inode, loff_t start,
+                                   loff_t end) { return; }
+               static struct inode_operations iops __attribute__ ((unused)) = {
+                       .truncate_range = truncate_range,
+               };
+       ],[
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_INODE_TRUNCATE_RANGE, 1,
+                         [iops->truncate_range() exists])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+])