static int btt_arena_write_layout()

in btt.c [970:1020]

• 40 lines of code
• 4 McCabe index (conditional complexity)

static int btt_arena_write_layout(struct arena_info *arena)
{
	int ret;
	u64 sum;
	struct btt_sb *super;
	struct nd_btt *nd_btt = arena->nd_btt;
	const uuid_t *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev);

	ret = btt_map_init(arena);
	if (ret)
		return ret;

	ret = btt_log_init(arena);
	if (ret)
		return ret;

	super = kzalloc(sizeof(struct btt_sb), GFP_NOIO);
	if (!super)
		return -ENOMEM;

	strncpy(super->signature, BTT_SIG, BTT_SIG_LEN);
	export_uuid(super->uuid, nd_btt->uuid);
	export_uuid(super->parent_uuid, parent_uuid);
	super->flags = cpu_to_le32(arena->flags);
	super->version_major = cpu_to_le16(arena->version_major);
	super->version_minor = cpu_to_le16(arena->version_minor);
	super->external_lbasize = cpu_to_le32(arena->external_lbasize);
	super->external_nlba = cpu_to_le32(arena->external_nlba);
	super->internal_lbasize = cpu_to_le32(arena->internal_lbasize);
	super->internal_nlba = cpu_to_le32(arena->internal_nlba);
	super->nfree = cpu_to_le32(arena->nfree);
	super->infosize = cpu_to_le32(sizeof(struct btt_sb));
	super->nextoff = cpu_to_le64(arena->nextoff);
	/*
	 * Subtract arena->infooff (arena start) so numbers are relative
	 * to 'this' arena
	 */
	super->dataoff = cpu_to_le64(arena->dataoff - arena->infooff);
	super->mapoff = cpu_to_le64(arena->mapoff - arena->infooff);
	super->logoff = cpu_to_le64(arena->logoff - arena->infooff);
	super->info2off = cpu_to_le64(arena->info2off - arena->infooff);

	super->flags = 0;
	sum = nd_sb_checksum((struct nd_gen_sb *) super);
	super->checksum = cpu_to_le64(sum);

	ret = btt_info_write(arena, super);

	kfree(super);
	return ret;
}