1 // SPDX-License-Identifier: GPL-2.0
14  * For further information, see "Documentation/block/cmdline-partition.rst"
30 	sector_t size;  member
51 		return -ENOMEM;  in parse_subpart()
53 	if (*partdef == '-') {  in parse_subpart()
54 		new_subpart->size = (sector_t)(~0ULL);  in parse_subpart()
57 		new_subpart->size = (sector_t)memparse(partdef, &partdef);  in parse_subpart()
58 		if (new_subpart->size < (sector_t)PAGE_SIZE) {  in parse_subpart()
59 			pr_warn("cmdline partition size is invalid.");  in parse_subpart()
60 			ret = -EINVAL;  in parse_subpart()
67 		new_subpart->from = (sector_t)memparse(partdef, &partdef);  in parse_subpart()
69 		new_subpart->from = (sector_t)(~0ULL);  in parse_subpart()
78 			ret = -EINVAL;  in parse_subpart()
82 		strscpy(new_subpart->name, next, sizeof(new_subpart->name));  in parse_subpart()
84 		new_subpart->name[0] = '\0';  in parse_subpart()
86 	new_subpart->flags = 0;  in parse_subpart()
89 		new_subpart->flags |= PF_RDONLY;  in parse_subpart()
94 		new_subpart->flags |= PF_POWERUP_LOCK;  in parse_subpart()
109 	while (parts->subpart) {  in free_subpart()
110 		subpart = parts->subpart;  in free_subpart()
111 		parts->subpart = subpart->next_subpart;  in free_subpart()
118 	int ret = -EINVAL;  in parse_parts()
127 		return -ENOMEM;  in parse_parts()
135 	strscpy(newparts->name, next, sizeof(newparts->name));  in parse_parts()
136 	newparts->nr_subparts = 0;  in parse_parts()
138 	next_subpart = &newparts->subpart;  in parse_parts()
145 		newparts->nr_subparts++;  in parse_parts()
146 		next_subpart = &(*next_subpart)->next_subpart;  in parse_parts()
149 	if (!newparts->subpart) {  in parse_parts()
151 		ret = -EINVAL;  in parse_parts()
169 		next_parts = (*parts)->next_parts;  in cmdline_parts_free()
189 		return -ENOMEM;  in cmdline_parts_parse()
198 		next_parts = &(*next_parts)->next_parts;  in cmdline_parts_parse()
203 		ret = -EINVAL;  in cmdline_parts_parse()
220 	while (parts && strncmp(bdev, parts->name, sizeof(parts->name)))  in cmdline_parts_find()
221 		parts = parts->next_parts;  in cmdline_parts_find()
228 static int add_part(int slot, struct cmdline_subpart *subpart,  in add_part()  argument
232 	char tmp[sizeof(info->volname) + 4];  in add_part()
234 	if (slot >= state->limit)  in add_part()
237 	put_partition(state, slot, subpart->from >> 9,  in add_part()
238 		      subpart->size >> 9);  in add_part()
240 	if (subpart->flags & PF_RDONLY)  in add_part()
241 		state->parts[slot].flags |= ADDPART_FLAG_READONLY;  in add_part()
243 	info = &state->parts[slot].info;  in add_part()
245 	strscpy(info->volname, subpart->name, sizeof(info->volname));  in add_part()
247 	snprintf(tmp, sizeof(tmp), "(%s)", info->volname);  in add_part()
248 	strlcat(state->pp_buf, tmp, PAGE_SIZE);  in add_part()
250 	state->parts[slot].has_info = true;  in add_part()
260 	int slot = 1;  in cmdline_parts_set()  local
262 	for (subpart = parts->subpart; subpart;  in cmdline_parts_set()
263 	     subpart = subpart->next_subpart, slot++) {  in cmdline_parts_set()
264 		if (subpart->from == (sector_t)(~0ULL))  in cmdline_parts_set()
265 			subpart->from = from;  in cmdline_parts_set()
267 			from = subpart->from;  in cmdline_parts_set()
272 		if (subpart->size > (disk_size - from))  in cmdline_parts_set()
273 			subpart->size = disk_size - from;  in cmdline_parts_set()
275 		from += subpart->size;  in cmdline_parts_set()
277 		if (add_part(slot, subpart, state))  in cmdline_parts_set()
281 	return slot;  in cmdline_parts_set()
291 static bool has_overlaps(sector_t from, sector_t size,  in has_overlaps()  argument
294 	sector_t end = from + size;  in has_overlaps()
318 static void cmdline_parts_verifier(int slot, struct parsed_partitions *state)  in cmdline_parts_verifier()  argument
323 	for (; slot < state->limit && state->parts[slot].has_info; slot++) {  in cmdline_parts_verifier()
324 		for (i = slot+1; i < state->limit && state->parts[i].has_info;  in cmdline_parts_verifier()
326 			if (has_overlaps(state->parts[slot].from,  in cmdline_parts_verifier()
327 					 state->parts[slot].size,  in cmdline_parts_verifier()
328 					 state->parts[i].from,  in cmdline_parts_verifier()
329 					 state->parts[i].size)) {  in cmdline_parts_verifier()
336 					state->parts[slot].info.volname,  in cmdline_parts_verifier()
337 					(u64)state->parts[slot].from << 9,  in cmdline_parts_verifier()
338 					(u64)state->parts[slot].size << 9,  in cmdline_parts_verifier()
339 					state->parts[i].info.volname,  in cmdline_parts_verifier()
340 					(u64)state->parts[i].from << 9,  in cmdline_parts_verifier()
341 					(u64)state->parts[i].size << 9);  in cmdline_parts_verifier()
350  * -1 if unable to read the partition table
365 			return -1;  in cmdline_partition()
373 	parts = cmdline_parts_find(bdev_parts, state->disk->disk_name);  in cmdline_partition()
377 	disk_size = get_capacity(state->disk) << 9;  in cmdline_partition()
382 	strlcat(state->pp_buf, "\n", PAGE_SIZE);  in cmdline_partition()