static int btt_log_init()

in btt.c [451:499]

• 38 lines of code
• 6 McCabe index (conditional complexity)

static int btt_log_init(struct arena_info *arena)
{
	size_t logsize = arena->info2off - arena->logoff;
	size_t chunk_size = SZ_4K, offset = 0;
	struct log_entry ent;
	void *zerobuf;
	int ret;
	u32 i;

	zerobuf = kzalloc(chunk_size, GFP_KERNEL);
	if (!zerobuf)
		return -ENOMEM;
	/*
	 * logoff should always be at least 512B  aligned. We rely on that to
	 * make sure rw_bytes does error clearing correctly, so make sure that
	 * is the case.
	 */
	dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->logoff, 512),
		"arena->logoff: %#llx is unaligned\n", arena->logoff);

	while (logsize) {
		size_t size = min(logsize, chunk_size);

		dev_WARN_ONCE(to_dev(arena), size < 512,
			"chunk size: %#zx is unaligned\n", size);
		ret = arena_write_bytes(arena, arena->logoff + offset, zerobuf,
				size, 0);
		if (ret)
			goto free;

		offset += size;
		logsize -= size;
		cond_resched();
	}

	for (i = 0; i < arena->nfree; i++) {
		ent.lba = cpu_to_le32(i);
		ent.old_map = cpu_to_le32(arena->external_nlba + i);
		ent.new_map = cpu_to_le32(arena->external_nlba + i);
		ent.seq = cpu_to_le32(LOG_SEQ_INIT);
		ret = __btt_log_write(arena, i, 0, &ent, 0);
		if (ret)
			goto free;
	}

 free:
	kfree(zerobuf);
	return ret;
}