-static void reada_defrag(struct btrfs_root *root,
- struct extent_buffer *node)
-{
- int i;
- u32 nritems;
- u64 bytenr;
- u32 blocksize;
- int ret;
-
- blocksize = btrfs_level_size(root, btrfs_header_level(node) - 1);
- nritems = btrfs_header_nritems(node);
- for (i = 0; i < nritems; i++) {
- bytenr = btrfs_node_blockptr(node, i);
- ret = readahead_tree_block(root, bytenr, blocksize);
- if (ret)
- break;
- }
-}
-
-static int defrag_walk_down(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct btrfs_path *path, int *level,
- int cache_only, u64 *last_ret)
-{
- struct extent_buffer *next;
- struct extent_buffer *cur;
- u64 bytenr;
- int ret = 0;
- int is_extent = 0;
-
- WARN_ON(*level < 0);
- WARN_ON(*level >= BTRFS_MAX_LEVEL);
-
- if (root->fs_info->extent_root == root)
- is_extent = 1;
-
- while(*level > 0) {
- WARN_ON(*level < 0);
- WARN_ON(*level >= BTRFS_MAX_LEVEL);
- cur = path->nodes[*level];
-
- if (!cache_only && *level > 1 && path->slots[*level] == 0)
- reada_defrag(root, cur);
-
- if (btrfs_header_level(cur) != *level)
- WARN_ON(1);
-
- if (path->slots[*level] >=
- btrfs_header_nritems(cur))
- break;
-
- if (*level == 1) {
- ret = btrfs_realloc_node(trans, root,
- path->nodes[*level],
- cache_only, last_ret);
- if (is_extent)
- btrfs_extent_post_op(trans, root);
-
- break;
- }
- bytenr = btrfs_node_blockptr(cur, path->slots[*level]);
-
- if (cache_only) {
- next = btrfs_find_tree_block(root, bytenr,
- btrfs_level_size(root, *level - 1));
- /* FIXME, test for defrag */
- if (!next || !btrfs_buffer_uptodate(next)) {
- free_extent_buffer(next);
- path->slots[*level]++;
- continue;
- }
- } else {
- next = read_tree_block(root, bytenr,
- btrfs_level_size(root, *level - 1));
- }
- ret = btrfs_cow_block(trans, root, next, path->nodes[*level],
- path->slots[*level], &next);
- BUG_ON(ret);
- ret = btrfs_realloc_node(trans, root, next, cache_only,
- last_ret);
- BUG_ON(ret);
-
- if (is_extent)
- btrfs_extent_post_op(trans, root);
-
- WARN_ON(*level <= 0);
- if (path->nodes[*level-1])
- free_extent_buffer(path->nodes[*level-1]);
- path->nodes[*level-1] = next;
- *level = btrfs_header_level(next);
- path->slots[*level] = 0;
- }
- WARN_ON(*level < 0);
- WARN_ON(*level >= BTRFS_MAX_LEVEL);
-
- btrfs_clear_buffer_defrag(path->nodes[*level]);
-
- free_extent_buffer(path->nodes[*level]);
- path->nodes[*level] = NULL;
- *level += 1;
- WARN_ON(ret);
- return 0;
-}
-
-static int defrag_walk_up(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct btrfs_path *path, int *level,
- int cache_only)
-{
- int i;
- int slot;
- struct extent_buffer *node;
-
- for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) {
- slot = path->slots[i];
- if (slot < btrfs_header_nritems(path->nodes[i]) - 1) {
- path->slots[i]++;
- *level = i;
- node = path->nodes[i];
- WARN_ON(i == 0);
- btrfs_node_key_to_cpu(node, &root->defrag_progress,
- path->slots[i]);
- root->defrag_level = i;
- return 0;
- } else {
- if (*level > 1 && path->nodes[*level] != root->node) {
- struct extent_buffer *next;
- u64 last;
- int ret;
- ret = btrfs_cow_block(trans, root,
- path->nodes[*level],
- path->nodes[*level + 1],
- path->slots[*level + 1],
- &next);
- BUG_ON(ret);
- path->nodes[*level] = next;
- last = next->start;
- ret = btrfs_realloc_node(trans, root, next,
- cache_only, &last);
- BUG_ON(ret);
-
- if (root == root->fs_info->extent_root)
- btrfs_extent_post_op(trans, root);
- }
-
- btrfs_clear_buffer_defrag(path->nodes[*level]);
- btrfs_clear_buffer_defrag_done(path->nodes[*level]);
- free_extent_buffer(path->nodes[*level]);
- path->nodes[*level] = NULL;
- *level = i + 1;
- }
- }
- return 1;
-}