Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / btrfs / raid56.h

diff --git a/kernel/fs/btrfs/raid56.h b/kernel/fs/btrfs/raid56.h
new file mode 100644 (file)
index 0000000..2b5d797
--- /dev/null
+++ b/kernel/fs/btrfs/raid56.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2012 Fusion-io  All rights reserved.
+ * Copyright (C) 2012 Intel Corp. All rights reserved.
+ *
+ * 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.
+ */
+
+#ifndef __BTRFS_RAID56__
+#define __BTRFS_RAID56__
+static inline int nr_parity_stripes(struct map_lookup *map)
+{
+       if (map->type & BTRFS_BLOCK_GROUP_RAID5)
+               return 1;
+       else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
+               return 2;
+       else
+               return 0;
+}
+
+static inline int nr_data_stripes(struct map_lookup *map)
+{
+       return map->num_stripes - nr_parity_stripes(map);
+}
+#define RAID5_P_STRIPE ((u64)-2)
+#define RAID6_Q_STRIPE ((u64)-1)
+
+#define is_parity_stripe(x) (((x) == RAID5_P_STRIPE) ||                \
+                            ((x) == RAID6_Q_STRIPE))
+
+struct btrfs_raid_bio;
+struct btrfs_device;
+
+int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
+                         struct btrfs_bio *bbio, u64 stripe_len,
+                         int mirror_num, int generic_io);
+int raid56_parity_write(struct btrfs_root *root, struct bio *bio,
+                              struct btrfs_bio *bbio, u64 stripe_len);
+
+struct btrfs_raid_bio *
+raid56_parity_alloc_scrub_rbio(struct btrfs_root *root, struct bio *bio,
+                              struct btrfs_bio *bbio, u64 stripe_len,
+                              struct btrfs_device *scrub_dev,
+                              unsigned long *dbitmap, int stripe_nsectors);
+void raid56_parity_add_scrub_pages(struct btrfs_raid_bio *rbio,
+                                  struct page *page, u64 logical);
+void raid56_parity_submit_scrub_rbio(struct btrfs_raid_bio *rbio);
+
+int btrfs_alloc_stripe_hash_table(struct btrfs_fs_info *info);
+void btrfs_free_stripe_hash_table(struct btrfs_fs_info *info);
+#endif