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/*
* fs/partitions/cmdline.c
*
* Copyright (C) 2010 Google, Inc.
* Author: Colin Cross <ccross@android.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
/*#define DEBUG 1*/
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/slab.h>
#include "check.h"
#include "cmdline.h"
static char *cmdline;
static int cmdline_parsed;
static struct part_device *cmdline_device;
struct part {
char *name;
unsigned long from;
unsigned long size;
unsigned long sector_size;
struct part *next_part;
};
struct part_device {
char *name;
struct part *first_part;
struct part_device *next_device;
};
/* Passed a string like:
* system:3600:10000:800
*/
static struct part *parse_partition(char *s, int alloc_size, void **alloc)
{
char *p;
struct part *this_part;
pr_debug("%s: '%s', %d, %p\n", __func__, s, alloc_size, alloc);
if (*alloc == NULL)
*alloc = kzalloc(alloc_size, GFP_KERNEL);
this_part = *alloc;
*alloc += sizeof(*this_part);
/* Name */
p = strchr(s, ':');
if (!p)
return this_part;
*p = 0;
this_part->name = s;
/* From */
s = p+1;
p = strchr(s, ':');
if (!p)
return this_part;
*p = 0;
this_part->from = simple_strtoul(s, NULL, 16);
/* Size */
s = p+1;
p = strchr(s, ':');
if (!p)
return this_part;
*p = 0;
this_part->size = simple_strtoul(s, NULL, 16);
/* Sector size */
s = p+1;
this_part->sector_size = simple_strtoul(s, NULL, 16);
pr_debug("%s: Found %s %lu %lu %lu\n", __func__, this_part->name,
this_part->from, this_part->size, this_part->sector_size);
return this_part;
}
/* Passed a string like:
* system:3600:10000:800,cache:13600:4000:800,userdata:17600:80000:800
* Could be an empty string
*/
static struct part *parse_partition_list(char *s, int alloc_size, void **alloc)
{
char *p;
struct part *this_part;
struct part *next_part = NULL;
pr_debug("%s: '%s', %d, %p\n", __func__, s, alloc_size, alloc);
alloc_size += sizeof(struct part);
p = strchr(s, ',');
if (p) {
*p = 0;
next_part = parse_partition_list(p+1, alloc_size, alloc);
if (!next_part)
BUG();
}
this_part = parse_partition(s, alloc_size, alloc);
this_part->next_part = next_part;
return this_part;
}
/* Passed a string like:
* sdhci.0=system:3600:10000:800,cache:13600:4000:800,userdata:17600:80000:800
*/
static struct part_device *parse_device(char *s, int alloc_size, void **alloc) {
char *p;
struct part *part;
struct part_device *device;
pr_debug("%s: '%s', %d, %p\n", __func__, s, alloc_size, alloc);
p = strchr(s, '=');
if (!p)
return NULL;
*p = 0;
alloc_size += sizeof(struct part_device);
part = parse_partition_list(p+1, alloc_size, alloc);
if (part) {
device = *alloc;
*alloc += sizeof(struct part_device);
device->name = s;
device->first_part = part;
}
return device;
}
static void parse_cmdline(void) {
char *s = cmdline;
void *alloc = 0;
if (cmdline_parsed)
return;
cmdline_device = parse_device(s, 0, &alloc);
cmdline_parsed = 1;
}
int copy_partitions_to_state(struct part_device *device,
struct parsed_partitions *state, unsigned int ssz)
{
int i = 0;
struct part *part = device->first_part;
while (part) {
sector_t from = part->from * part->sector_size / ssz;
sector_t size = part->size * part->sector_size / ssz;
put_named_partition(state, i+1, from, size, part->name,
strlen(part->name));
i++;
part = part->next_part;
}
return i;
}
int cmdline_partition(struct parsed_partitions *state)
{
struct block_device *bdev = state->bdev;
unsigned int ssz = bdev_logical_block_size(bdev);
parse_cmdline();
pr_debug("%s: %s\n", __func__, dev_name(disk_to_dev(bdev->bd_disk)));
if (!cmdline_device)
return 0;
if (strcmp(cmdline_device->name, dev_name(disk_to_dev(bdev->bd_disk))))
return 0;
/* We have a command line partition that matches this device */
copy_partitions_to_state(cmdline_device, state, ssz);
return 1;
}
__init static int cmdline_partition_setup(char *s)
{
cmdline = s;
return 1;
}
__setup("tegrapart=", cmdline_partition_setup);
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