-/*
- * check if there are any file extent pointers in the leaf point to
- * data require processing
- */
-static int check_file_extents(struct reloc_control *rc,
- u64 bytenr, u32 blocksize, u64 ptr_gen)
-{
- struct btrfs_key found_key;
- struct btrfs_file_extent_item *fi;
- struct extent_buffer *leaf;
- u32 nritems;
- int i;
- int ret = 0;
-
- leaf = read_tree_block(rc->extent_root, bytenr, blocksize, ptr_gen);
-
- nritems = btrfs_header_nritems(leaf);
- for (i = 0; i < nritems; i++) {
- cond_resched();
- btrfs_item_key_to_cpu(leaf, &found_key, i);
- if (found_key.type != BTRFS_EXTENT_DATA_KEY)
- continue;
- fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item);
- if (btrfs_file_extent_type(leaf, fi) ==
- BTRFS_FILE_EXTENT_INLINE)
- continue;
- bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
- if (bytenr == 0)
- continue;
- if (in_block_group(bytenr, rc->block_group)) {
- ret = 1;
- break;
- }
- }
- free_extent_buffer(leaf);
- return ret;
-}
-
-/*
- * scan child blocks of a given block to find blocks require processing
- */
-static int add_child_blocks(struct btrfs_trans_handle *trans,
- struct reloc_control *rc,
- struct backref_node *node,
- struct rb_root *blocks)
-{
- struct tree_block *block;
- struct rb_node *rb_node;
- u64 bytenr;
- u64 ptr_gen;
- u32 blocksize;
- u32 nritems;
- int i;
- int err = 0;
-
- nritems = btrfs_header_nritems(node->eb);
- blocksize = btrfs_level_size(rc->extent_root, node->level - 1);
- for (i = 0; i < nritems; i++) {
- cond_resched();
- bytenr = btrfs_node_blockptr(node->eb, i);
- ptr_gen = btrfs_node_ptr_generation(node->eb, i);
- if (ptr_gen == trans->transid)
- continue;
- if (!in_block_group(bytenr, rc->block_group) &&
- (node->level > 1 || rc->stage == MOVE_DATA_EXTENTS))
- continue;
- if (tree_block_processed(bytenr, blocksize, rc))
- continue;
-
- readahead_tree_block(rc->extent_root,
- bytenr, blocksize, ptr_gen);
- }
-
- for (i = 0; i < nritems; i++) {
- cond_resched();
- bytenr = btrfs_node_blockptr(node->eb, i);
- ptr_gen = btrfs_node_ptr_generation(node->eb, i);
- if (ptr_gen == trans->transid)
- continue;
- if (!in_block_group(bytenr, rc->block_group) &&
- (node->level > 1 || rc->stage == MOVE_DATA_EXTENTS))
- continue;
- if (tree_block_processed(bytenr, blocksize, rc))
- continue;
- if (!in_block_group(bytenr, rc->block_group) &&
- !check_file_extents(rc, bytenr, blocksize, ptr_gen))
- continue;
-
- block = kmalloc(sizeof(*block), GFP_NOFS);
- if (!block) {
- err = -ENOMEM;
- break;
- }
- block->bytenr = bytenr;
- btrfs_node_key_to_cpu(node->eb, &block->key, i);
- block->level = node->level - 1;
- block->key_ready = 1;
- rb_node = tree_insert(blocks, block->bytenr, &block->rb_node);
- BUG_ON(rb_node);
- }
- if (err)
- free_block_list(blocks);
- return err;
-}
-
-/*
- * find adjacent blocks require processing
- */
-static noinline_for_stack
-int add_adjacent_blocks(struct btrfs_trans_handle *trans,
- struct reloc_control *rc,
- struct backref_cache *cache,
- struct rb_root *blocks, int level,
- struct backref_node **upper)
-{
- struct backref_node *node;
- int ret = 0;
-
- WARN_ON(!list_empty(&cache->pending[level]));
-
- if (list_empty(&cache->pending[level + 1]))
- return 1;
-
- node = list_entry(cache->pending[level + 1].next,
- struct backref_node, lower);
- if (node->eb)
- ret = add_child_blocks(trans, rc, node, blocks);
-
- *upper = node;
- return ret;
-}
-