md/raid6: move raid6 data processing to raid6_pq.ko
Move the raid6 data processing routines into a standalone module
(raid6_pq) to prepare them to be called from async_tx wrappers and other
non-md drivers/modules. This precludes a circular dependency of raid456
needing the async modules for data processing while those modules in
turn depend on raid456 for the base level synchronous raid6 routines.
To support this move:
1/ The exportable definitions in raid6.h move to include/linux/raid/pq.h
2/ The raid6_call, recovery calls, and table symbols are exported
3/ Extra #ifdef __KERNEL__ statements to enable the userspace raid6test to
compile
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/raid6algos.c b/drivers/md/raid6algos.c
index 1f6a3c8..866215a 100644
--- a/drivers/md/raid6algos.c
+++ b/drivers/md/raid6algos.c
@@ -16,13 +16,20 @@
* Algorithm list and algorithm selection for RAID-6
*/
-#include "raid6.h"
+#include <linux/raid/pq.h>
#ifndef __KERNEL__
#include <sys/mman.h>
#include <stdio.h>
+#else
+#if !RAID6_USE_EMPTY_ZERO_PAGE
+/* In .bss so it's zeroed */
+const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(256)));
+EXPORT_SYMBOL(raid6_empty_zero_page);
+#endif
#endif
struct raid6_calls raid6_call;
+EXPORT_SYMBOL_GPL(raid6_call);
/* Various routine sets */
extern const struct raid6_calls raid6_intx1;
@@ -79,6 +86,7 @@
#else
/* Need more time to be stable in userspace */
#define RAID6_TIME_JIFFIES_LG2 9
+#define time_before(x, y) ((x) < (y))
#endif
/* Try to pick the best algorithm */
@@ -152,3 +160,12 @@
return best ? 0 : -EINVAL;
}
+
+static void raid6_exit(void)
+{
+ do { } while (0);
+}
+
+subsys_initcall(raid6_select_algo);
+module_exit(raid6_exit);
+MODULE_LICENSE("GPL");