| dnl # |
| dnl # Interface for issuing a discard bio: |
| dnl # 2.6.28-2.6.35: BIO_RW_BARRIER |
| dnl # 2.6.36-3.x: REQ_BARRIER |
| dnl # |
| dnl # |
| dnl # Since REQ_BARRIER is a preprocessor definition, there is no need for an |
| dnl # autotools check for it. Also, REQ_BARRIER existed in the request layer |
| dnl # until torvalds/linux@7b6d91daee5cac6402186ff224c3af39d79f4a0e unified the |
| dnl # request layer and bio layer flags, so it would be wrong to assume that |
| dnl # the APIs are mutually exclusive contrary to the typical case. |
| dnl # |
| AC_DEFUN([ZFS_AC_KERNEL_SRC_BIO_RW_BARRIER], [ |
| ZFS_LINUX_TEST_SRC([bio_rw_barrier], [ |
| #include <linux/bio.h> |
| ],[ |
| int flags __attribute__ ((unused)); |
| flags = BIO_RW_BARRIER; |
| ]) |
| ]) |
| |
| AC_DEFUN([ZFS_AC_KERNEL_BIO_RW_BARRIER], [ |
| AC_MSG_CHECKING([whether BIO_RW_BARRIER is defined]) |
| ZFS_LINUX_TEST_RESULT([bio_rw_barrier], [ |
| AC_MSG_RESULT(yes) |
| AC_DEFINE(HAVE_BIO_RW_BARRIER, 1, [BIO_RW_BARRIER is defined]) |
| ],[ |
| AC_MSG_RESULT(no) |
| ]) |
| ]) |