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path: root/drivers/mtd/cmdlinepart.c
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Diffstat (limited to 'drivers/mtd/cmdlinepart.c')
-rw-r--r--drivers/mtd/cmdlinepart.c262
1 files changed, 142 insertions, 120 deletions
diff --git a/drivers/mtd/cmdlinepart.c b/drivers/mtd/cmdlinepart.c
index ddf9ec6d916..3e829b37af8 100644
--- a/drivers/mtd/cmdlinepart.c
+++ b/drivers/mtd/cmdlinepart.c
@@ -22,11 +22,22 @@
*
* mtdparts=<mtddef>[;<mtddef]
* <mtddef> := <mtd-id>:<partdef>[,<partdef>]
- * where <mtd-id> is the name from the "cat /proc/mtd" command
- * <partdef> := <size>[@offset][<name>][ro][lk]
+ * <partdef> := <size>[@<offset>][<name>][ro][lk]
* <mtd-id> := unique name used in mapping driver/device (mtd->name)
* <size> := standard linux memsize OR "-" to denote all remaining space
+ * size is automatically truncated at end of device
+ * if specified or trucated size is 0 the part is skipped
+ * <offset> := standard linux memsize
+ * if omitted the part will immediately follow the previous part
+ * or 0 if the first part
* <name> := '(' NAME ')'
+ * NAME will appear in /proc/mtd
+ *
+ * <size> and <offset> can be specified such that the parts are out of order
+ * in physical memory and may even overlap.
+ *
+ * The parts are assigned MTD numbers in the order they are specified in the
+ * command line regardless of their order in physical memory.
*
* Examples:
*
@@ -39,11 +50,10 @@
#include <linux/kernel.h>
#include <linux/slab.h>
-
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
-#include <linux/bootmem.h>
#include <linux/module.h>
+#include <linux/err.h>
/* error message prefix */
#define ERRP "mtd: "
@@ -57,8 +67,8 @@
/* special size referring to all the remaining space in a partition */
-#define SIZE_REMAINING UINT_MAX
-#define OFFSET_CONTINUOUS UINT_MAX
+#define SIZE_REMAINING ULLONG_MAX
+#define OFFSET_CONTINUOUS ULLONG_MAX
struct cmdline_mtd_partition {
struct cmdline_mtd_partition *next;
@@ -70,9 +80,10 @@ struct cmdline_mtd_partition {
/* mtdpart_setup() parses into here */
static struct cmdline_mtd_partition *partitions;
-/* the command line passed to mtdpart_setupd() */
+/* the command line passed to mtdpart_setup() */
+static char *mtdparts;
static char *cmdline;
-static int cmdline_parsed = 0;
+static int cmdline_parsed;
/*
* Parse one partition definition for an MTD. Since there can be many
@@ -83,15 +94,14 @@ static int cmdline_parsed = 0;
* syntax has been verified ok.
*/
static struct mtd_partition * newpart(char *s,
- char **retptr,
- int *num_parts,
- int this_part,
- unsigned char **extra_mem_ptr,
- int extra_mem_size)
+ char **retptr,
+ int *num_parts,
+ int this_part,
+ unsigned char **extra_mem_ptr,
+ int extra_mem_size)
{
struct mtd_partition *parts;
- unsigned long size;
- unsigned long offset = OFFSET_CONTINUOUS;
+ unsigned long long size, offset = OFFSET_CONTINUOUS;
char *name;
int name_len;
unsigned char *extra_mem;
@@ -99,124 +109,107 @@ static struct mtd_partition * newpart(char *s,
unsigned int mask_flags;
/* fetch the partition size */
- if (*s == '-')
- { /* assign all remaining space to this partition */
+ if (*s == '-') {
+ /* assign all remaining space to this partition */
size = SIZE_REMAINING;
s++;
- }
- else
- {
+ } else {
size = memparse(s, &s);
- if (size < PAGE_SIZE)
- {
- printk(KERN_ERR ERRP "partition size too small (%lx)\n", size);
- return NULL;
+ if (size < PAGE_SIZE) {
+ printk(KERN_ERR ERRP "partition size too small (%llx)\n",
+ size);
+ return ERR_PTR(-EINVAL);
}
}
/* fetch partition name and flags */
mask_flags = 0; /* this is going to be a regular partition */
delim = 0;
- /* check for offset */
- if (*s == '@')
- {
- s++;
- offset = memparse(s, &s);
- }
- /* now look for name */
+
+ /* check for offset */
+ if (*s == '@') {
+ s++;
+ offset = memparse(s, &s);
+ }
+
+ /* now look for name */
if (*s == '(')
- {
delim = ')';
- }
- if (delim)
- {
+ if (delim) {
char *p;
- name = ++s;
+ name = ++s;
p = strchr(name, delim);
- if (!p)
- {
+ if (!p) {
printk(KERN_ERR ERRP "no closing %c found in partition name\n", delim);
- return NULL;
+ return ERR_PTR(-EINVAL);
}
name_len = p - name;
s = p + 1;
- }
- else
- {
- name = NULL;
+ } else {
+ name = NULL;
name_len = 13; /* Partition_000 */
}
/* record name length for memory allocation later */
extra_mem_size += name_len + 1;
- /* test for options */
- if (strncmp(s, "ro", 2) == 0)
- {
+ /* test for options */
+ if (strncmp(s, "ro", 2) == 0) {
mask_flags |= MTD_WRITEABLE;
s += 2;
- }
+ }
- /* if lk is found do NOT unlock the MTD partition*/
- if (strncmp(s, "lk", 2) == 0)
- {
+ /* if lk is found do NOT unlock the MTD partition*/
+ if (strncmp(s, "lk", 2) == 0) {
mask_flags |= MTD_POWERUP_LOCK;
s += 2;
- }
+ }
/* test if more partitions are following */
- if (*s == ',')
- {
- if (size == SIZE_REMAINING)
- {
+ if (*s == ',') {
+ if (size == SIZE_REMAINING) {
printk(KERN_ERR ERRP "no partitions allowed after a fill-up partition\n");
- return NULL;
+ return ERR_PTR(-EINVAL);
}
/* more partitions follow, parse them */
parts = newpart(s + 1, &s, num_parts, this_part + 1,
&extra_mem, extra_mem_size);
- if (!parts)
- return NULL;
- }
- else
- { /* this is the last partition: allocate space for all */
+ if (IS_ERR(parts))
+ return parts;
+ } else {
+ /* this is the last partition: allocate space for all */
int alloc_size;
*num_parts = this_part + 1;
alloc_size = *num_parts * sizeof(struct mtd_partition) +
extra_mem_size;
+
parts = kzalloc(alloc_size, GFP_KERNEL);
if (!parts)
- return NULL;
+ return ERR_PTR(-ENOMEM);
extra_mem = (unsigned char *)(parts + *num_parts);
}
+
/* enter this partition (offset will be calculated later if it is zero at this point) */
parts[this_part].size = size;
parts[this_part].offset = offset;
parts[this_part].mask_flags = mask_flags;
if (name)
- {
strlcpy(extra_mem, name, name_len + 1);
- }
else
- {
sprintf(extra_mem, "Partition_%03d", this_part);
- }
parts[this_part].name = extra_mem;
extra_mem += name_len + 1;
dbg(("partition %d: name <%s>, offset %llx, size %llx, mask flags %x\n",
- this_part,
- parts[this_part].name,
- parts[this_part].offset,
- parts[this_part].size,
- parts[this_part].mask_flags));
+ this_part, parts[this_part].name, parts[this_part].offset,
+ parts[this_part].size, parts[this_part].mask_flags));
/* return (updated) pointer to extra_mem memory */
if (extra_mem_ptr)
- *extra_mem_ptr = extra_mem;
+ *extra_mem_ptr = extra_mem;
/* return (updated) pointer command line string */
*retptr = s;
@@ -236,16 +229,16 @@ static int mtdpart_setup_real(char *s)
{
struct cmdline_mtd_partition *this_mtd;
struct mtd_partition *parts;
- int mtd_id_len;
- int num_parts;
+ int mtd_id_len, num_parts;
char *p, *mtd_id;
- mtd_id = s;
+ mtd_id = s;
+
/* fetch <mtd-id> */
- if (!(p = strchr(s, ':')))
- {
+ p = strchr(s, ':');
+ if (!p) {
printk(KERN_ERR ERRP "no mtd-id\n");
- return 0;
+ return -EINVAL;
}
mtd_id_len = p - mtd_id;
@@ -262,8 +255,7 @@ static int mtdpart_setup_real(char *s)
(unsigned char**)&this_mtd, /* out: extra mem */
mtd_id_len + 1 + sizeof(*this_mtd) +
sizeof(void*)-1 /*alignment*/);
- if(!parts)
- {
+ if (IS_ERR(parts)) {
/*
* An error occurred. We're either:
* a) out of memory, or
@@ -271,12 +263,12 @@ static int mtdpart_setup_real(char *s)
* Either way, this mtd is hosed and we're
* unlikely to succeed in parsing any more
*/
- return 0;
+ return PTR_ERR(parts);
}
/* align this_mtd */
this_mtd = (struct cmdline_mtd_partition *)
- ALIGN((unsigned long)this_mtd, sizeof(void*));
+ ALIGN((unsigned long)this_mtd, sizeof(void *));
/* enter results */
this_mtd->parts = parts;
this_mtd->num_parts = num_parts;
@@ -296,14 +288,14 @@ static int mtdpart_setup_real(char *s)
break;
/* does another spec follow? */
- if (*s != ';')
- {
+ if (*s != ';') {
printk(KERN_ERR ERRP "bad character after partition (%c)\n", *s);
- return 0;
+ return -EINVAL;
}
s++;
}
- return 1;
+
+ return 0;
}
/*
@@ -317,46 +309,64 @@ static int parse_cmdline_partitions(struct mtd_info *master,
struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
- unsigned long offset;
- int i;
+ unsigned long long offset;
+ int i, err;
struct cmdline_mtd_partition *part;
const char *mtd_id = master->name;
/* parse command line */
- if (!cmdline_parsed)
- mtdpart_setup_real(cmdline);
+ if (!cmdline_parsed) {
+ err = mtdpart_setup_real(cmdline);
+ if (err)
+ return err;
+ }
- for(part = partitions; part; part = part->next)
- {
+ /*
+ * Search for the partition definition matching master->name.
+ * If master->name is not set, stop at first partition definition.
+ */
+ for (part = partitions; part; part = part->next) {
if ((!mtd_id) || (!strcmp(part->mtd_id, mtd_id)))
- {
- for(i = 0, offset = 0; i < part->num_parts; i++)
- {
- if (part->parts[i].offset == OFFSET_CONTINUOUS)
- part->parts[i].offset = offset;
- else
- offset = part->parts[i].offset;
- if (part->parts[i].size == SIZE_REMAINING)
- part->parts[i].size = master->size - offset;
- if (offset + part->parts[i].size > master->size)
- {
- printk(KERN_WARNING ERRP
- "%s: partitioning exceeds flash size, truncating\n",
- part->mtd_id);
- part->parts[i].size = master->size - offset;
- part->num_parts = i;
- }
- offset += part->parts[i].size;
- }
- *pparts = kmemdup(part->parts,
- sizeof(*part->parts) * part->num_parts,
- GFP_KERNEL);
- if (!*pparts)
- return -ENOMEM;
- return part->num_parts;
+ break;
+ }
+
+ if (!part)
+ return 0;
+
+ for (i = 0, offset = 0; i < part->num_parts; i++) {
+ if (part->parts[i].offset == OFFSET_CONTINUOUS)
+ part->parts[i].offset = offset;
+ else
+ offset = part->parts[i].offset;
+
+ if (part->parts[i].size == SIZE_REMAINING)
+ part->parts[i].size = master->size - offset;
+
+ if (offset + part->parts[i].size > master->size) {
+ printk(KERN_WARNING ERRP
+ "%s: partitioning exceeds flash size, truncating\n",
+ part->mtd_id);
+ part->parts[i].size = master->size - offset;
+ }
+ offset += part->parts[i].size;
+
+ if (part->parts[i].size == 0) {
+ printk(KERN_WARNING ERRP
+ "%s: skipping zero sized partition\n",
+ part->mtd_id);
+ part->num_parts--;
+ memmove(&part->parts[i], &part->parts[i + 1],
+ sizeof(*part->parts) * (part->num_parts - i));
+ i--;
}
}
- return 0;
+
+ *pparts = kmemdup(part->parts, sizeof(*part->parts) * part->num_parts,
+ GFP_KERNEL);
+ if (!*pparts)
+ return -ENOMEM;
+
+ return part->num_parts;
}
@@ -367,7 +377,7 @@ static int parse_cmdline_partitions(struct mtd_info *master,
*
* This function needs to be visible for bootloaders.
*/
-static int mtdpart_setup(char *s)
+static int __init mtdpart_setup(char *s)
{
cmdline = s;
return 1;
@@ -383,10 +393,22 @@ static struct mtd_part_parser cmdline_parser = {
static int __init cmdline_parser_init(void)
{
- return register_mtd_parser(&cmdline_parser);
+ if (mtdparts)
+ mtdpart_setup(mtdparts);
+ register_mtd_parser(&cmdline_parser);
+ return 0;
+}
+
+static void __exit cmdline_parser_exit(void)
+{
+ deregister_mtd_parser(&cmdline_parser);
}
module_init(cmdline_parser_init);
+module_exit(cmdline_parser_exit);
+
+MODULE_PARM_DESC(mtdparts, "Partitioning specification");
+module_param(mtdparts, charp, 0);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 12:06:12 +0000