resetting manifest requested domain to floor

[platform/upstream/btrfs-progs.git] / volumes.h

diff --git a/volumes.h b/volumes.h
index bc3516a..5bcaae7 100644 (file)
--- a/volumes.h
+++ b/volumes.h
@@ -209,6 +209,28 @@ static inline int check_crossing_stripes(struct btrfs_fs_info *fs_info,
                (bg_offset + len - 1) / BTRFS_STRIPE_LEN);
 }
 
+static inline u64 calc_stripe_length(u64 type, u64 length, int num_stripes)
+{
+       u64 stripe_size;
+
+       if (type & BTRFS_BLOCK_GROUP_RAID0) {
+               stripe_size = length;
+               stripe_size /= num_stripes;
+       } else if (type & BTRFS_BLOCK_GROUP_RAID10) {
+               stripe_size = length * 2;
+               stripe_size /= num_stripes;
+       } else if (type & BTRFS_BLOCK_GROUP_RAID5) {
+               stripe_size = length;
+               stripe_size /= (num_stripes - 1);
+       } else if (type & BTRFS_BLOCK_GROUP_RAID6) {
+               stripe_size = length;
+               stripe_size /= (num_stripes - 2);
+       } else {
+               stripe_size = length;
+       }
+       return stripe_size;
+}
+
 int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
                      u64 logical, u64 *length, u64 *type,
                      struct btrfs_multi_bio **multi_ret, int mirror_num,