block: add verifier for cmdline partition

}

__setup("blkdevparts=", cmdline_parts_setup);

static bool has_overlaps(sector_t from, sector_t size,

			 sector_t from2, sector_t size2)

{

	sector_t end = from + size;

	sector_t end2 = from2 + size2;

	if (from >= from2 && from < end2)

		return true;

	if (end > from2 && end <= end2)

		return true;

	if (from2 >= from && from2 < end)

		return true;

	if (end2 > from && end2 <= end)

		return true;

	return false;

}

static inline void overlaps_warns_header(void)

{

	pr_warn("Overlapping partitions are used in command line partitions.");

	pr_warn("Don't use filesystems on overlapping partitions:");

}

static void cmdline_parts_verifier(int slot, struct parsed_partitions *state)

{

	int i;

	bool header = true;

	for (; slot < state->limit && state->parts[slot].has_info; slot++) {

		for (i = slot+1; i < state->limit && state->parts[i].has_info;

		     i++) {

			if (has_overlaps(state->parts[slot].from,

					 state->parts[slot].size,

					 state->parts[i].from,

					 state->parts[i].size)) {

				if (header) {

					header = false;

					overlaps_warns_header();

				}

				pr_warn("%s[%llu,%llu] overlaps with "

					"%s[%llu,%llu].",

					state->parts[slot].info.volname,

					(u64)state->parts[slot].from << 9,

					(u64)state->parts[slot].size << 9,

					state->parts[i].info.volname,

					(u64)state->parts[i].from << 9,

					(u64)state->parts[i].size << 9);

			}

		}

	}

}

/*

 * Purpose: allocate cmdline partitions.

 * Returns:

	disk_size = get_capacity(state->bdev->bd_disk) << 9;

	cmdline_parts_set(parts, disk_size, 1, add_part, (void *)state);

	cmdline_parts_verifier(1, state);

	strlcat(state->pp_buf, "\n", PAGE_SIZE);