1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * Copyright © 2002      SYSGO Real-Time Solutions GmbH
6  * Copyright © 2002-2010 David Woodhouse <dwmw2@infradead.org>
11  * <mtddef>  := <mtd-id>:<partdef>[,<partdef>]
12  * <partdef> := <size>[@<offset>][<name>][ro][lk][slc]
13  * <mtd-id>  := unique name used in mapping driver/device (mtd->name)
14  * <size>    := standard linux memsize OR "-" to denote all remaining space
20  * <name>    := '(' NAME ')'
21  *              NAME will appear in /proc/mtd
26  * The parts are assigned MTD numbers in the order they are specified in the
32  * edb7312-nor:-
35  * edb7312-nor:256k(ARMboot)ro,-(root);edb7312-nand:-(home)
38 #define pr_fmt(fmt)	"mtd: " fmt
42 #include <linux/mtd/mtd.h>
43 #include <linux/mtd/partitions.h>
67  * Parse one partition definition for an MTD. Since there can be many
83 	char *name;  in newpart()  local
90 	if (*s == '-') {  in newpart()
98 			return ERR_PTR(-EINVAL);  in newpart()
102 	/* fetch partition name and flags */  in newpart()
113 	/* now look for name */  in newpart()
120 		name = ++s;  in newpart()
121 		p = strchr(name, delim);  in newpart()
123 			pr_err("no closing %c found in partition name\n", delim);  in newpart()
124 			return ERR_PTR(-EINVAL);  in newpart()
126 		name_len = p - name;  in newpart()
129 		name = NULL;  in newpart()
133 	/* record name length for memory allocation later */  in newpart()
142 	/* if lk is found do NOT unlock the MTD partition*/  in newpart()
157 			pr_err("no partitions allowed after a fill-up partition\n");  in newpart()
158 			return ERR_PTR(-EINVAL);  in newpart()
175 			return ERR_PTR(-ENOMEM);  in newpart()
187 	if (name)  in newpart()
188 		strscpy(extra_mem, name, name_len + 1);  in newpart()
191 	parts[this_part].name = extra_mem;  in newpart()
194 	pr_debug("partition %d: name <%s>, offset %llx, size %llx, mask flags %x\n",  in newpart()
195 	     this_part, parts[this_part].name, parts[this_part].offset,  in newpart()
232 		 * make sure that part-names with ":" will not be handled as  in mtdpart_setup_real()
233 		 * part of the mtd-id with an ":"  in mtdpart_setup_real()
242 		 * fetch <mtd-id>. We use strrchr to ignore all ':' that could  in mtdpart_setup_real()
243 		 * be present in the MTD name, only the last one is interpreted  in mtdpart_setup_real()
244 		 * as an <mtd-id>/<part-definition> separator.  in mtdpart_setup_real()
257 			pr_err("no mtd-id\n");  in mtdpart_setup_real()
258 			return -EINVAL;  in mtdpart_setup_real()
260 		mtd_id_len = p - mtd_id;  in mtdpart_setup_real()
265 		 * parse one mtd. have it reserve memory for the  in mtdpart_setup_real()
266 		 * struct cmdline_mtd_partition and the mtd-id string.  in mtdpart_setup_real()
274 				sizeof(void*)-1 /*alignment*/);  in mtdpart_setup_real()
280 			 * Either way, this mtd is hosed and we're  in mtdpart_setup_real()
290 		this_mtd->parts = parts;  in mtdpart_setup_real()
291 		this_mtd->num_parts = num_parts;  in mtdpart_setup_real()
292 		this_mtd->mtd_id = (char*)(this_mtd + 1);  in mtdpart_setup_real()
293 		strscpy(this_mtd->mtd_id, mtd_id, mtd_id_len + 1);  in mtdpart_setup_real()
296 		this_mtd->next = partitions;  in mtdpart_setup_real()
300 		     this_mtd->mtd_id, this_mtd->num_parts);  in mtdpart_setup_real()
303 		/* EOS - we're done */  in mtdpart_setup_real()
310 			return -EINVAL;  in mtdpart_setup_real()
319  * Main function to be called from the MTD mapping driver/device to
322  * information. It returns partitions for the requested mtd device, or
332 	const char *mtd_id = master->name;  in parse_cmdline_partitions()
342 	 * Search for the partition definition matching master->name.  in parse_cmdline_partitions()
343 	 * If master->name is not set, stop at first partition definition.  in parse_cmdline_partitions()
345 	for (part = partitions; part; part = part->next) {  in parse_cmdline_partitions()
346 		if ((!mtd_id) || (!strcmp(part->mtd_id, mtd_id)))  in parse_cmdline_partitions()
353 	for (i = 0, offset = 0; i < part->num_parts; i++) {  in parse_cmdline_partitions()
354 		if (part->parts[i].offset == OFFSET_CONTINUOUS)  in parse_cmdline_partitions()
355 			part->parts[i].offset = offset;  in parse_cmdline_partitions()
357 			offset = part->parts[i].offset;  in parse_cmdline_partitions()
359 		if (part->parts[i].size == SIZE_REMAINING)  in parse_cmdline_partitions()
360 			part->parts[i].size = master->size - offset;  in parse_cmdline_partitions()
362 		if (offset + part->parts[i].size > master->size) {  in parse_cmdline_partitions()
364 				part->mtd_id);  in parse_cmdline_partitions()
365 			part->parts[i].size = master->size - offset;  in parse_cmdline_partitions()
367 		offset += part->parts[i].size;  in parse_cmdline_partitions()
369 		if (part->parts[i].size == 0) {  in parse_cmdline_partitions()
371 				part->mtd_id);  in parse_cmdline_partitions()
372 			part->num_parts--;  in parse_cmdline_partitions()
373 			memmove(&part->parts[i], &part->parts[i + 1],  in parse_cmdline_partitions()
374 				sizeof(*part->parts) * (part->num_parts - i));  in parse_cmdline_partitions()
375 			i--;  in parse_cmdline_partitions()
379 	*pparts = kmemdup(part->parts, sizeof(*part->parts) * part->num_parts,  in parse_cmdline_partitions()
382 		return -ENOMEM;  in parse_cmdline_partitions()
384 	return part->num_parts;  in parse_cmdline_partitions()
405 	.name = "cmdlinepart",
429 MODULE_DESCRIPTION("Command line configuration of MTD partitions");