btrfs-progs: raid56: Introduce raid56 header for later recovery usage

Introduce a new header, kernel-lib/raid56.h, for later raid56 works.

It contains 2 functions, from original btrfs-progs code:
void raid6_gen_syndrome(int disks, size_t bytes, void **ptrs);
int raid5_gen_result(int nr_devs, size_t stripe_len, int dest, void **data);

Will be expanded later and some part of it(RAID6 recover part) may keep
sync with kernel later.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
[ unify gpl header, rename header macro ]
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/kernel-lib/raid56.h b/kernel-lib/raid56.h
new file mode 100644
index 00000000..0d52f3db
--- /dev/null
+++ b/kernel-lib/raid56.h
@@ -0,0 +1,28 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+/*
+ * Original headers from kernel library for RAID5/6 calculations, not from
+ * btrfs kernel header.
+ */
+
+#ifndef __BTRFS_PROGS_RAID56_H__
+#define __BTRFS_PROGS_RAID56_H__
+
+void raid6_gen_syndrome(int disks, size_t bytes, void **ptrs);
+int raid5_gen_result(int nr_devs, size_t stripe_len, int dest, void **data);
+
+#endif