Add FAILFAST support

[zfs.git] / config / kernel-bio-failfast.m4

diff --git a/config/kernel-bio-failfast.m4 b/config/kernel-bio-failfast.m4
new file mode 100644 (file)
index 0000000..acc6575
--- /dev/null
+++ b/config/kernel-bio-failfast.m4
@@ -0,0 +1,22 @@
+dnl #
+dnl # 2.6.28 API change
+dnl # Device, transport, and driver FAILFAST flags were added and
+dnl # the now legacy BIO_RW_FAILFAST flag was removed.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_BIO_FAILFAST], [
+       AC_MSG_CHECKING([whether BIO_RW_FAILFAST_* are defined])
+       ZFS_LINUX_TRY_COMPILE([
+               #include <linux/bio.h>
+       ],[
+               int flags;
+               flags = ((1 << BIO_RW_FAILFAST_DEV) |
+                        (1 << BIO_RW_FAILFAST_TRANSPORT) |
+                        (1 << BIO_RW_FAILFAST_DRIVER));
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_BIO_RW_FAILFAST, 1,
+                         [BIO_RW_FAILFAST_* are defined])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+])