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

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([ZFS_AC_KERNEL_INODE_LOCK], [
	AC_MSG_CHECKING([whether inode_lock_shared() exists])
	tmp_flags="$EXTRA_KCFLAGS"
	EXTRA_KCFLAGS="-Werror"
	ZFS_LINUX_TRY_COMPILE([
		#include <linux/fs.h>
	],[
		struct inode *inode = NULL;
		inode_lock_shared(inode);
	],[
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_INODE_LOCK_SHARED, 1, [yes])
	],[
		AC_MSG_RESULT(no)
	])
	EXTRA_KCFLAGS="$tmp_flags"
])
Commit	Line	Data
48ef8ba0 BB	1	dnl #
	2	dnl # 4.7 API change
	3	dnl # i_mutex is changed to i_rwsem. Instead of directly using
	4	dnl # i_mutex/i_rwsem, we should use inode_lock() and inode_lock_shared()
	5	dnl # We test inode_lock_shared because inode_lock is introduced earlier.
	6	dnl #
93ce2b4c	7	AC_DEFUN([ZFS_AC_KERNEL_INODE_LOCK], [
48ef8ba0 BB	8	AC_MSG_CHECKING([whether inode_lock_shared() exists])
	9	tmp_flags="$EXTRA_KCFLAGS"
	10	EXTRA_KCFLAGS="-Werror"
93ce2b4c	11	ZFS_LINUX_TRY_COMPILE([
48ef8ba0 BB	12	#include <linux/fs.h>
	13	],[
	14	struct inode *inode = NULL;
	15	inode_lock_shared(inode);
	16	],[
	17	AC_MSG_RESULT(yes)
	18	AC_DEFINE(HAVE_INODE_LOCK_SHARED, 1, [yes])
	19	],[
	20	AC_MSG_RESULT(no)
	21	])
	22	EXTRA_KCFLAGS="$tmp_flags"
	23	])