static int discover_arenas()

in btt.c [847:932]

• 71 lines of code
• 12 McCabe index (conditional complexity)

static int discover_arenas(struct btt *btt)
{
	int ret = 0;
	struct arena_info *arena;
	struct btt_sb *super;
	size_t remaining = btt->rawsize;
	u64 cur_nlba = 0;
	size_t cur_off = 0;
	int num_arenas = 0;

	super = kzalloc(sizeof(*super), GFP_KERNEL);
	if (!super)
		return -ENOMEM;

	while (remaining) {
		/* Alloc memory for arena */
		arena = alloc_arena(btt, 0, 0, 0);
		if (!arena) {
			ret = -ENOMEM;
			goto out_super;
		}

		arena->infooff = cur_off;
		ret = btt_info_read(arena, super);
		if (ret)
			goto out;

		if (!nd_btt_arena_is_valid(btt->nd_btt, super)) {
			if (remaining == btt->rawsize) {
				btt->init_state = INIT_NOTFOUND;
				dev_info(to_dev(arena), "No existing arenas\n");
				goto out;
			} else {
				dev_err(to_dev(arena),
						"Found corrupted metadata!\n");
				ret = -ENODEV;
				goto out;
			}
		}

		arena->external_lba_start = cur_nlba;
		parse_arena_meta(arena, super, cur_off);

		ret = log_set_indices(arena);
		if (ret) {
			dev_err(to_dev(arena),
				"Unable to deduce log/padding indices\n");
			goto out;
		}

		ret = btt_freelist_init(arena);
		if (ret)
			goto out;

		ret = btt_rtt_init(arena);
		if (ret)
			goto out;

		ret = btt_maplocks_init(arena);
		if (ret)
			goto out;

		list_add_tail(&arena->list, &btt->arena_list);

		remaining -= arena->size;
		cur_off += arena->size;
		cur_nlba += arena->external_nlba;
		num_arenas++;

		if (arena->nextoff == 0)
			break;
	}
	btt->num_arenas = num_arenas;
	btt->nlba = cur_nlba;
	btt->init_state = INIT_READY;

	kfree(super);
	return ret;

 out:
	kfree(arena);
	free_arenas(btt);
 out_super:
	kfree(super);
	return ret;
}