static noinline int commit_fs_roots(struct btrfs_trans_handle *trans, struct btrfs_root *root) { struct btrfs_root *gang[8]; struct btrfs_fs_info *fs_info = root->fs_info; int i; int ret; int err = 0; while (1) { ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix, (void **)gang, 0, ARRAY_SIZE(gang), BTRFS_ROOT_TRANS_TAG); if (ret == 0) break; for (i = 0; i < ret; i++) { root = gang[i]; radix_tree_tag_clear(&fs_info->fs_roots_radix, (unsigned long)root->root_key.objectid, BTRFS_ROOT_TRANS_TAG); btrfs_free_log(trans, root); btrfs_update_reloc_root(trans, root); btrfs_orphan_commit_root(trans, root); if (root->commit_root != root->node) { switch_commit_root(root); btrfs_set_root_node(&root->root_item, root->node); } err = btrfs_update_root(trans, fs_info->tree_root, &root->root_key, &root->root_item); if (err) break; } } return err; }
/* * at transaction commit time we need to schedule the old roots for * deletion via btrfs_drop_snapshot. This runs through all the * reference counted roots that were modified in the current * transaction and puts them into the drop list */ static noinline int add_dirty_roots(struct btrfs_trans_handle *trans, struct radix_tree_root *radix, struct list_head *list) { struct btrfs_dirty_root *dirty; struct btrfs_root *gang[8]; struct btrfs_root *root; int i; int ret; int err = 0; u32 refs; while (1) { ret = radix_tree_gang_lookup_tag(radix, (void **)gang, 0, ARRAY_SIZE(gang), BTRFS_ROOT_TRANS_TAG); if (ret == 0) break; for (i = 0; i < ret; i++) { root = gang[i]; radix_tree_tag_clear(radix, (unsigned long)root->root_key.objectid, BTRFS_ROOT_TRANS_TAG); BUG_ON(!root->ref_tree); dirty = root->dirty_root; btrfs_free_log(trans, root); btrfs_free_reloc_root(trans, root); if (root->commit_root == root->node) { WARN_ON(root->node->start != btrfs_root_bytenr(&root->root_item)); free_extent_buffer(root->commit_root); root->commit_root = NULL; root->dirty_root = NULL; spin_lock(&root->list_lock); list_del_init(&dirty->root->dead_list); spin_unlock(&root->list_lock); kfree(dirty->root); kfree(dirty); /* make sure to update the root on disk * so we get any updates to the block used * counts */ err = btrfs_update_root(trans, root->fs_info->tree_root, &root->root_key, &root->root_item); continue; } memset(&root->root_item.drop_progress, 0, sizeof(struct btrfs_disk_key)); root->root_item.drop_level = 0; root->commit_root = NULL; root->dirty_root = NULL; root->root_key.offset = root->fs_info->generation; btrfs_set_root_bytenr(&root->root_item, root->node->start); btrfs_set_root_level(&root->root_item, btrfs_header_level(root->node)); btrfs_set_root_generation(&root->root_item, root->root_key.offset); err = btrfs_insert_root(trans, root->fs_info->tree_root, &root->root_key, &root->root_item); if (err) break; refs = btrfs_root_refs(&dirty->root->root_item); btrfs_set_root_refs(&dirty->root->root_item, refs - 1); err = btrfs_update_root(trans, root->fs_info->tree_root, &dirty->root->root_key, &dirty->root->root_item); BUG_ON(err); if (refs == 1) { list_add(&dirty->list, list); } else { WARN_ON(1); free_extent_buffer(dirty->root->node); kfree(dirty->root); kfree(dirty); } } } return err; }