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// SPDX-License-Identifier: GPL-2.0
 * Parse command line, get partition information
 * Written by Cai Zhiyong <caizhiyong@huawei.com>
#include <linux/export.h>
#include <linux/cmdline-parser.h>
static int parse_subpart(struct cmdline_subpart **subpart, char *partdef)
	int ret = 0;
	struct cmdline_subpart *new_subpart;
	*subpart = NULL;
	new_subpart = kzalloc(sizeof(struct cmdline_subpart), GFP_KERNEL);
	if (!new_subpart)
		return -ENOMEM;
	if (*partdef == '-') {
		new_subpart->size = (sector_t)(~0ULL);
		partdef++;
		new_subpart->size = (sector_t)memparse(partdef, &partdef);
		if (new_subpart->size < (sector_t)PAGE_SIZE) {
			pr_warn("cmdline partition size is invalid.");
			ret = -EINVAL;
			goto fail;
	if (*partdef == '@') {
		partdef++;
		new_subpart->from = (sector_t)memparse(partdef, &partdef);
		new_subpart->from = (sector_t)(~0ULL);
	if (*partdef == '(') {
		int length;
		char *next = strchr(++partdef, ')');
		if (!next) {
			pr_warn("cmdline partition format is invalid.");
			ret = -EINVAL;
			goto fail;
		length = min_t(int, next - partdef,
			       sizeof(new_subpart->name) - 1);
		strncpy(new_subpart->name, partdef, length);
		new_subpart->name[length] = '\0';
		partdef = ++next;
		new_subpart->name[0] = '\0';
	new_subpart->flags = 0;
	if (!strncmp(partdef, "ro", 2)) {
		new_subpart->flags |= PF_RDONLY;
		partdef += 2;
	if (!strncmp(partdef, "lk", 2)) {
		new_subpart->flags |= PF_POWERUP_LOCK;
		partdef += 2;
	*subpart = new_subpart;
	kfree(new_subpart);
	return ret;
static void free_subpart(struct cmdline_parts *parts)
	struct cmdline_subpart *subpart;
	while (parts->subpart) {
		subpart = parts->subpart;
		parts->subpart = subpart->next_subpart;
		kfree(subpart);
static int parse_parts(struct cmdline_parts **parts, const char *bdevdef)
	int ret = -EINVAL;
	char *next;
	int length;
	struct cmdline_subpart **next_subpart;
	struct cmdline_parts *newparts;
	char buf[BDEVNAME_SIZE + 32 + 4];
	*parts = NULL;
	newparts = kzalloc(sizeof(struct cmdline_parts), GFP_KERNEL);
	if (!newparts)
		return -ENOMEM;
	next = strchr(bdevdef, ':');
	if (!next) {
		pr_warn("cmdline partition has no block device.");
		goto fail;
	length = min_t(int, next - bdevdef, sizeof(newparts->name) - 1);
	strncpy(newparts->name, bdevdef, length);
	newparts->name[length] = '\0';
	newparts->nr_subparts = 0;
	next_subpart = &newparts->subpart;
	while (next && *(++next)) {
		bdevdef = next;
		next = strchr(bdevdef, ',');
		length = (!next) ? (sizeof(buf) - 1) :
			min_t(int, next - bdevdef, sizeof(buf) - 1);
		strncpy(buf, bdevdef, length);
		buf[length] = '\0';
		ret = parse_subpart(next_subpart, buf);
			goto fail;
		newparts->nr_subparts++;
		next_subpart = &(*next_subpart)->next_subpart;
	if (!newparts->subpart) {
		pr_warn("cmdline partition has no valid partition.");
		ret = -EINVAL;
		goto fail;
	*parts = newparts;
	free_subpart(newparts);
	kfree(newparts);
	return ret;
void cmdline_parts_free(struct cmdline_parts **parts)
	struct cmdline_parts *next_parts;
	while (*parts) {
		next_parts = (*parts)->next_parts;
		free_subpart(*parts);
		kfree(*parts);
		*parts = next_parts;
EXPORT_SYMBOL(cmdline_parts_free);
int cmdline_parts_parse(struct cmdline_parts **parts, const char *cmdline)
	char *buf;
	char *pbuf;
	char *next;
	struct cmdline_parts **next_parts;
	*parts = NULL;
	next = pbuf = buf = kstrdup(cmdline, GFP_KERNEL);
		return -ENOMEM;
	next_parts = parts;
	while (next && *pbuf) {
		next = strchr(pbuf, ';');
		if (next)
			*next = '\0';
		ret = parse_parts(next_parts, pbuf);
			goto fail;
		if (next)
			pbuf = ++next;
		next_parts = &(*next_parts)->next_parts;
	if (!*parts) {
		pr_warn("cmdline partition has no valid partition.");
		ret = -EINVAL;
		goto fail;
	kfree(buf);
	return ret;
	cmdline_parts_free(parts);
	goto done;
EXPORT_SYMBOL(cmdline_parts_parse);
struct cmdline_parts *cmdline_parts_find(struct cmdline_parts *parts,
					 const char *bdev)
	while (parts && strncmp(bdev, parts->name, sizeof(parts->name)))
		parts = parts->next_parts;
	return parts;
EXPORT_SYMBOL(cmdline_parts_find);
 *  add_part()
 *    0 success.
 *    1 can not add so many partitions.
int cmdline_parts_set(struct cmdline_parts *parts, sector_t disk_size,
		      int slot,
		      int (*add_part)(int, struct cmdline_subpart *, void *),
		      void *param)
	sector_t from = 0;
	struct cmdline_subpart *subpart;
	for (subpart = parts->subpart; subpart;
	     subpart = subpart->next_subpart, slot++) {
		if (subpart->from == (sector_t)(~0ULL))
			subpart->from = from;
			from = subpart->from;
		if (from >= disk_size)
		if (subpart->size > (disk_size - from))
			subpart->size = disk_size - from;
		from += subpart->size;
		if (add_part(slot, subpart, param))
	return slot;
EXPORT_SYMBOL(cmdline_parts_set);
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