-int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
- struct btrfs_device *device,
- u64 chunk_tree, u64 chunk_objectid,
- u64 chunk_offset,
- u64 num_bytes, u64 *start);
-int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
+#define BTRFS_RAID5_P_STRIPE ((u64)-2)
+#define BTRFS_RAID6_Q_STRIPE ((u64)-1)
+
+/*
+ * Check if the given range cross stripes.
+ * To ensure kernel scrub won't causing bug on with METADATA in mixed
+ * block group
+ *
+ * Return 1 if the range crosses STRIPE boundary
+ * Return 0 if the range doesn't cross STRIPE boundary or it
+ * doesn't belong to any block group (no boundary to cross)
+ */
+static inline int check_crossing_stripes(struct btrfs_fs_info *fs_info,
+ u64 start, u64 len)
+{
+ struct btrfs_block_group_cache *bg_cache;
+ u64 bg_offset;
+
+ bg_cache = btrfs_lookup_block_group(fs_info, start);
+ /*
+ * Does not belong to block group, no boundary to cross
+ * although it's a bigger problem, but here we don't care.
+ */
+ if (!bg_cache)
+ return 0;
+ bg_offset = start - bg_cache->key.objectid;
+
+ return (bg_offset / BTRFS_STRIPE_LEN !=
+ (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,