Split spl-build.m4

[mirror_spl.git] / config / kernel-inode-lock.m4

diff --git a/config/kernel-inode-lock.m4 b/config/kernel-inode-lock.m4
new file mode 100644 (file)
index 0000000..2cc06a5
--- /dev/null
+++ b/config/kernel-inode-lock.m4
@@ -0,0 +1,23 @@
+dnl #
+dnl # 4.7 API change
+dnl # i_mutex is changed to i_rwsem. Instead of directly using
+dnl # i_mutex/i_rwsem, we should use inode_lock() and inode_lock_shared()
+dnl # We test inode_lock_shared because inode_lock is introduced earlier.
+dnl #
+AC_DEFUN([SPL_AC_INODE_LOCK], [
+       AC_MSG_CHECKING([whether inode_lock_shared() exists])
+       tmp_flags="$EXTRA_KCFLAGS"
+       EXTRA_KCFLAGS="-Werror"
+       SPL_LINUX_TRY_COMPILE([
+               #include <linux/fs.h>
+       ],[
+               struct inode *inode = NULL;
+               inode_lock_shared(inode);
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_INODE_LOCK_SHARED, 1, [yes])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+       EXTRA_KCFLAGS="$tmp_flags"
+])