Add build system

[zfs.git] / config / kernel-blk-fetch-request.m4

diff --git a/config/kernel-blk-fetch-request.m4 b/config/kernel-blk-fetch-request.m4
new file mode 100644 (file)
index 0000000..34a5d2f
--- /dev/null
+++ b/config/kernel-blk-fetch-request.m4
@@ -0,0 +1,22 @@
+dnl #
+dnl # 2.6.31 API change
+dnl # Request queue peek/retrieval interface cleanup, the blk_fetch_request()
+dnl # function replaces the elv_next_request() and blk_fetch_request()
+dnl # functions.  The updated blk_fetch_request() function returns the
+dnl # next available request and removed it from the request queue.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_BLK_FETCH_REQUEST], [
+       AC_MSG_CHECKING([whether blk_fetch_request() is available])
+       ZFS_LINUX_TRY_COMPILE([
+               #include <linux/blkdev.h>
+       ],[
+               struct request_queue *q = NULL;
+               (void) blk_fetch_request(q);
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_BLK_FETCH_REQUEST, 1,
+                         [blk_fetch_request() is available])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+])