1192 lines
33 KiB
C
1192 lines
33 KiB
C
/*
|
|
* Copyright (c) International Business Machines Corp., 2006
|
|
* Copyright (c) Nokia Corporation, 2007
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
* Author: Artem Bityutskiy (Битюцкий Артём),
|
|
* Frank Haverkamp
|
|
*/
|
|
|
|
/*
|
|
* This file includes UBI initialization and building of UBI devices.
|
|
*
|
|
* When UBI is initialized, it attaches all the MTD devices specified as the
|
|
* module load parameters or the kernel boot parameters. If MTD devices were
|
|
* specified, UBI does not attach any MTD device, but it is possible to do
|
|
* later using the "UBI control device".
|
|
*
|
|
* At the moment we only attach UBI devices by scanning, which will become a
|
|
* bottleneck when flashes reach certain large size. Then one may improve UBI
|
|
* and add other methods, although it does not seem to be easy to do.
|
|
*/
|
|
|
|
#ifdef UBI_LINUX
|
|
#include <linux/err.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/stringify.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/miscdevice.h>
|
|
#include <linux/log2.h>
|
|
#include <linux/kthread.h>
|
|
#endif
|
|
#include <ubi_uboot.h>
|
|
#include "ubi.h"
|
|
|
|
#if (CONFIG_SYS_MALLOC_LEN < (512 << 10))
|
|
#error Malloc area too small for UBI, increase CONFIG_SYS_MALLOC_LEN to >= 512k
|
|
#endif
|
|
|
|
/* Maximum length of the 'mtd=' parameter */
|
|
#define MTD_PARAM_LEN_MAX 64
|
|
|
|
/**
|
|
* struct mtd_dev_param - MTD device parameter description data structure.
|
|
* @name: MTD device name or number string
|
|
* @vid_hdr_offs: VID header offset
|
|
*/
|
|
struct mtd_dev_param
|
|
{
|
|
char name[MTD_PARAM_LEN_MAX];
|
|
int vid_hdr_offs;
|
|
};
|
|
|
|
/* Numbers of elements set in the @mtd_dev_param array */
|
|
static int mtd_devs = 0;
|
|
|
|
/* MTD devices specification parameters */
|
|
static struct mtd_dev_param mtd_dev_param[UBI_MAX_DEVICES];
|
|
|
|
/* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */
|
|
struct class *ubi_class;
|
|
|
|
#ifdef UBI_LINUX
|
|
/* Slab cache for wear-leveling entries */
|
|
struct kmem_cache *ubi_wl_entry_slab;
|
|
|
|
/* UBI control character device */
|
|
static struct miscdevice ubi_ctrl_cdev = {
|
|
.minor = MISC_DYNAMIC_MINOR,
|
|
.name = "ubi_ctrl",
|
|
.fops = &ubi_ctrl_cdev_operations,
|
|
};
|
|
#endif
|
|
|
|
/* All UBI devices in system */
|
|
struct ubi_device *ubi_devices[UBI_MAX_DEVICES];
|
|
|
|
#ifdef UBI_LINUX
|
|
/* Serializes UBI devices creations and removals */
|
|
DEFINE_MUTEX(ubi_devices_mutex);
|
|
|
|
/* Protects @ubi_devices and @ubi->ref_count */
|
|
static DEFINE_SPINLOCK(ubi_devices_lock);
|
|
|
|
/* "Show" method for files in '/<sysfs>/class/ubi/' */
|
|
static ssize_t ubi_version_show(struct class *class, char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", UBI_VERSION);
|
|
}
|
|
|
|
/* UBI version attribute ('/<sysfs>/class/ubi/version') */
|
|
static struct class_attribute ubi_version =
|
|
__ATTR(version, S_IRUGO, ubi_version_show, NULL);
|
|
|
|
static ssize_t dev_attribute_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf);
|
|
|
|
/* UBI device attributes (correspond to files in '/<sysfs>/class/ubi/ubiX') */
|
|
static struct device_attribute dev_eraseblock_size =
|
|
__ATTR(eraseblock_size, S_IRUGO, dev_attribute_show, NULL);
|
|
static struct device_attribute dev_avail_eraseblocks =
|
|
__ATTR(avail_eraseblocks, S_IRUGO, dev_attribute_show, NULL);
|
|
static struct device_attribute dev_total_eraseblocks =
|
|
__ATTR(total_eraseblocks, S_IRUGO, dev_attribute_show, NULL);
|
|
static struct device_attribute dev_volumes_count =
|
|
__ATTR(volumes_count, S_IRUGO, dev_attribute_show, NULL);
|
|
static struct device_attribute dev_max_ec =
|
|
__ATTR(max_ec, S_IRUGO, dev_attribute_show, NULL);
|
|
static struct device_attribute dev_reserved_for_bad =
|
|
__ATTR(reserved_for_bad, S_IRUGO, dev_attribute_show, NULL);
|
|
static struct device_attribute dev_bad_peb_count =
|
|
__ATTR(bad_peb_count, S_IRUGO, dev_attribute_show, NULL);
|
|
static struct device_attribute dev_max_vol_count =
|
|
__ATTR(max_vol_count, S_IRUGO, dev_attribute_show, NULL);
|
|
static struct device_attribute dev_min_io_size =
|
|
__ATTR(min_io_size, S_IRUGO, dev_attribute_show, NULL);
|
|
static struct device_attribute dev_bgt_enabled =
|
|
__ATTR(bgt_enabled, S_IRUGO, dev_attribute_show, NULL);
|
|
static struct device_attribute dev_mtd_num =
|
|
__ATTR(mtd_num, S_IRUGO, dev_attribute_show, NULL);
|
|
#endif
|
|
|
|
/**
|
|
* ubi_get_device - get UBI device.
|
|
* @ubi_num: UBI device number
|
|
*
|
|
* This function returns UBI device description object for UBI device number
|
|
* @ubi_num, or %NULL if the device does not exist. This function increases the
|
|
* device reference count to prevent removal of the device. In other words, the
|
|
* device cannot be removed if its reference count is not zero.
|
|
*/
|
|
struct ubi_device *ubi_get_device(int ubi_num)
|
|
{
|
|
struct ubi_device *ubi;
|
|
|
|
spin_lock(&ubi_devices_lock);
|
|
ubi = ubi_devices[ubi_num];
|
|
if (ubi) {
|
|
ubi_assert(ubi->ref_count >= 0);
|
|
ubi->ref_count += 1;
|
|
get_device(&ubi->dev);
|
|
}
|
|
spin_unlock(&ubi_devices_lock);
|
|
|
|
return ubi;
|
|
}
|
|
|
|
/**
|
|
* ubi_put_device - drop an UBI device reference.
|
|
* @ubi: UBI device description object
|
|
*/
|
|
void ubi_put_device(struct ubi_device *ubi)
|
|
{
|
|
spin_lock(&ubi_devices_lock);
|
|
ubi->ref_count -= 1;
|
|
put_device(&ubi->dev);
|
|
spin_unlock(&ubi_devices_lock);
|
|
}
|
|
|
|
/**
|
|
* ubi_get_by_major - get UBI device description object by character device
|
|
* major number.
|
|
* @major: major number
|
|
*
|
|
* This function is similar to 'ubi_get_device()', but it searches the device
|
|
* by its major number.
|
|
*/
|
|
struct ubi_device *ubi_get_by_major(int major)
|
|
{
|
|
int i;
|
|
struct ubi_device *ubi;
|
|
|
|
spin_lock(&ubi_devices_lock);
|
|
for (i = 0; i < UBI_MAX_DEVICES; i++) {
|
|
ubi = ubi_devices[i];
|
|
if (ubi && MAJOR(ubi->cdev.dev) == major) {
|
|
ubi_assert(ubi->ref_count >= 0);
|
|
ubi->ref_count += 1;
|
|
get_device(&ubi->dev);
|
|
spin_unlock(&ubi_devices_lock);
|
|
return ubi;
|
|
}
|
|
}
|
|
spin_unlock(&ubi_devices_lock);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* ubi_major2num - get UBI device number by character device major number.
|
|
* @major: major number
|
|
*
|
|
* This function searches UBI device number object by its major number. If UBI
|
|
* device was not found, this function returns -ENODEV, otherwise the UBI device
|
|
* number is returned.
|
|
*/
|
|
int ubi_major2num(int major)
|
|
{
|
|
int i, ubi_num = -ENODEV;
|
|
|
|
spin_lock(&ubi_devices_lock);
|
|
for (i = 0; i < UBI_MAX_DEVICES; i++) {
|
|
struct ubi_device *ubi = ubi_devices[i];
|
|
|
|
if (ubi && MAJOR(ubi->cdev.dev) == major) {
|
|
ubi_num = ubi->ubi_num;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&ubi_devices_lock);
|
|
|
|
return ubi_num;
|
|
}
|
|
|
|
#ifdef UBI_LINUX
|
|
/* "Show" method for files in '/<sysfs>/class/ubi/ubiX/' */
|
|
static ssize_t dev_attribute_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
ssize_t ret;
|
|
struct ubi_device *ubi;
|
|
|
|
/*
|
|
* The below code looks weird, but it actually makes sense. We get the
|
|
* UBI device reference from the contained 'struct ubi_device'. But it
|
|
* is unclear if the device was removed or not yet. Indeed, if the
|
|
* device was removed before we increased its reference count,
|
|
* 'ubi_get_device()' will return -ENODEV and we fail.
|
|
*
|
|
* Remember, 'struct ubi_device' is freed in the release function, so
|
|
* we still can use 'ubi->ubi_num'.
|
|
*/
|
|
ubi = container_of(dev, struct ubi_device, dev);
|
|
ubi = ubi_get_device(ubi->ubi_num);
|
|
if (!ubi)
|
|
return -ENODEV;
|
|
|
|
if (attr == &dev_eraseblock_size)
|
|
ret = sprintf(buf, "%d\n", ubi->leb_size);
|
|
else if (attr == &dev_avail_eraseblocks)
|
|
ret = sprintf(buf, "%d\n", ubi->avail_pebs);
|
|
else if (attr == &dev_total_eraseblocks)
|
|
ret = sprintf(buf, "%d\n", ubi->good_peb_count);
|
|
else if (attr == &dev_volumes_count)
|
|
ret = sprintf(buf, "%d\n", ubi->vol_count - UBI_INT_VOL_COUNT);
|
|
else if (attr == &dev_max_ec)
|
|
ret = sprintf(buf, "%d\n", ubi->max_ec);
|
|
else if (attr == &dev_reserved_for_bad)
|
|
ret = sprintf(buf, "%d\n", ubi->beb_rsvd_pebs);
|
|
else if (attr == &dev_bad_peb_count)
|
|
ret = sprintf(buf, "%d\n", ubi->bad_peb_count);
|
|
else if (attr == &dev_max_vol_count)
|
|
ret = sprintf(buf, "%d\n", ubi->vtbl_slots);
|
|
else if (attr == &dev_min_io_size)
|
|
ret = sprintf(buf, "%d\n", ubi->min_io_size);
|
|
else if (attr == &dev_bgt_enabled)
|
|
ret = sprintf(buf, "%d\n", ubi->thread_enabled);
|
|
else if (attr == &dev_mtd_num)
|
|
ret = sprintf(buf, "%d\n", ubi->mtd->index);
|
|
else
|
|
ret = -EINVAL;
|
|
|
|
ubi_put_device(ubi);
|
|
return ret;
|
|
}
|
|
|
|
/* Fake "release" method for UBI devices */
|
|
static void dev_release(struct device *dev) { }
|
|
|
|
/**
|
|
* ubi_sysfs_init - initialize sysfs for an UBI device.
|
|
* @ubi: UBI device description object
|
|
*
|
|
* This function returns zero in case of success and a negative error code in
|
|
* case of failure.
|
|
*/
|
|
static int ubi_sysfs_init(struct ubi_device *ubi)
|
|
{
|
|
int err;
|
|
|
|
ubi->dev.release = dev_release;
|
|
ubi->dev.devt = ubi->cdev.dev;
|
|
ubi->dev.class = ubi_class;
|
|
sprintf(&ubi->dev.bus_id[0], UBI_NAME_STR"%d", ubi->ubi_num);
|
|
err = device_register(&ubi->dev);
|
|
if (err)
|
|
return err;
|
|
|
|
err = device_create_file(&ubi->dev, &dev_eraseblock_size);
|
|
if (err)
|
|
return err;
|
|
err = device_create_file(&ubi->dev, &dev_avail_eraseblocks);
|
|
if (err)
|
|
return err;
|
|
err = device_create_file(&ubi->dev, &dev_total_eraseblocks);
|
|
if (err)
|
|
return err;
|
|
err = device_create_file(&ubi->dev, &dev_volumes_count);
|
|
if (err)
|
|
return err;
|
|
err = device_create_file(&ubi->dev, &dev_max_ec);
|
|
if (err)
|
|
return err;
|
|
err = device_create_file(&ubi->dev, &dev_reserved_for_bad);
|
|
if (err)
|
|
return err;
|
|
err = device_create_file(&ubi->dev, &dev_bad_peb_count);
|
|
if (err)
|
|
return err;
|
|
err = device_create_file(&ubi->dev, &dev_max_vol_count);
|
|
if (err)
|
|
return err;
|
|
err = device_create_file(&ubi->dev, &dev_min_io_size);
|
|
if (err)
|
|
return err;
|
|
err = device_create_file(&ubi->dev, &dev_bgt_enabled);
|
|
if (err)
|
|
return err;
|
|
err = device_create_file(&ubi->dev, &dev_mtd_num);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ubi_sysfs_close - close sysfs for an UBI device.
|
|
* @ubi: UBI device description object
|
|
*/
|
|
static void ubi_sysfs_close(struct ubi_device *ubi)
|
|
{
|
|
device_remove_file(&ubi->dev, &dev_mtd_num);
|
|
device_remove_file(&ubi->dev, &dev_bgt_enabled);
|
|
device_remove_file(&ubi->dev, &dev_min_io_size);
|
|
device_remove_file(&ubi->dev, &dev_max_vol_count);
|
|
device_remove_file(&ubi->dev, &dev_bad_peb_count);
|
|
device_remove_file(&ubi->dev, &dev_reserved_for_bad);
|
|
device_remove_file(&ubi->dev, &dev_max_ec);
|
|
device_remove_file(&ubi->dev, &dev_volumes_count);
|
|
device_remove_file(&ubi->dev, &dev_total_eraseblocks);
|
|
device_remove_file(&ubi->dev, &dev_avail_eraseblocks);
|
|
device_remove_file(&ubi->dev, &dev_eraseblock_size);
|
|
device_unregister(&ubi->dev);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* kill_volumes - destroy all volumes.
|
|
* @ubi: UBI device description object
|
|
*/
|
|
static void kill_volumes(struct ubi_device *ubi)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ubi->vtbl_slots; i++)
|
|
if (ubi->volumes[i])
|
|
ubi_free_volume(ubi, ubi->volumes[i]);
|
|
}
|
|
|
|
/**
|
|
* uif_init - initialize user interfaces for an UBI device.
|
|
* @ubi: UBI device description object
|
|
*
|
|
* This function returns zero in case of success and a negative error code in
|
|
* case of failure.
|
|
*/
|
|
static int uif_init(struct ubi_device *ubi)
|
|
{
|
|
int i, err;
|
|
#ifdef UBI_LINUX
|
|
dev_t dev;
|
|
#endif
|
|
|
|
sprintf(ubi->ubi_name, UBI_NAME_STR "%d", ubi->ubi_num);
|
|
|
|
/*
|
|
* Major numbers for the UBI character devices are allocated
|
|
* dynamically. Major numbers of volume character devices are
|
|
* equivalent to ones of the corresponding UBI character device. Minor
|
|
* numbers of UBI character devices are 0, while minor numbers of
|
|
* volume character devices start from 1. Thus, we allocate one major
|
|
* number and ubi->vtbl_slots + 1 minor numbers.
|
|
*/
|
|
err = alloc_chrdev_region(&dev, 0, ubi->vtbl_slots + 1, ubi->ubi_name);
|
|
if (err) {
|
|
ubi_err("cannot register UBI character devices");
|
|
return err;
|
|
}
|
|
|
|
ubi_assert(MINOR(dev) == 0);
|
|
cdev_init(&ubi->cdev, &ubi_cdev_operations);
|
|
dbg_msg("%s major is %u", ubi->ubi_name, MAJOR(dev));
|
|
ubi->cdev.owner = THIS_MODULE;
|
|
|
|
err = cdev_add(&ubi->cdev, dev, 1);
|
|
if (err) {
|
|
ubi_err("cannot add character device");
|
|
goto out_unreg;
|
|
}
|
|
|
|
err = ubi_sysfs_init(ubi);
|
|
if (err)
|
|
goto out_sysfs;
|
|
|
|
for (i = 0; i < ubi->vtbl_slots; i++)
|
|
if (ubi->volumes[i]) {
|
|
err = ubi_add_volume(ubi, ubi->volumes[i]);
|
|
if (err) {
|
|
ubi_err("cannot add volume %d", i);
|
|
goto out_volumes;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_volumes:
|
|
kill_volumes(ubi);
|
|
out_sysfs:
|
|
ubi_sysfs_close(ubi);
|
|
cdev_del(&ubi->cdev);
|
|
out_unreg:
|
|
unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1);
|
|
ubi_err("cannot initialize UBI %s, error %d", ubi->ubi_name, err);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* uif_close - close user interfaces for an UBI device.
|
|
* @ubi: UBI device description object
|
|
*/
|
|
static void uif_close(struct ubi_device *ubi)
|
|
{
|
|
kill_volumes(ubi);
|
|
ubi_sysfs_close(ubi);
|
|
cdev_del(&ubi->cdev);
|
|
unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1);
|
|
}
|
|
|
|
/**
|
|
* attach_by_scanning - attach an MTD device using scanning method.
|
|
* @ubi: UBI device descriptor
|
|
*
|
|
* This function returns zero in case of success and a negative error code in
|
|
* case of failure.
|
|
*
|
|
* Note, currently this is the only method to attach UBI devices. Hopefully in
|
|
* the future we'll have more scalable attaching methods and avoid full media
|
|
* scanning. But even in this case scanning will be needed as a fall-back
|
|
* attaching method if there are some on-flash table corruptions.
|
|
*/
|
|
static int attach_by_scanning(struct ubi_device *ubi)
|
|
{
|
|
int err;
|
|
struct ubi_scan_info *si;
|
|
|
|
si = ubi_scan(ubi);
|
|
if (IS_ERR(si))
|
|
return PTR_ERR(si);
|
|
|
|
ubi->bad_peb_count = si->bad_peb_count;
|
|
ubi->good_peb_count = ubi->peb_count - ubi->bad_peb_count;
|
|
ubi->max_ec = si->max_ec;
|
|
ubi->mean_ec = si->mean_ec;
|
|
|
|
err = ubi_read_volume_table(ubi, si);
|
|
if (err)
|
|
goto out_si;
|
|
|
|
err = ubi_wl_init_scan(ubi, si);
|
|
if (err)
|
|
goto out_vtbl;
|
|
|
|
err = ubi_eba_init_scan(ubi, si);
|
|
if (err)
|
|
goto out_wl;
|
|
|
|
ubi_scan_destroy_si(si);
|
|
return 0;
|
|
|
|
out_wl:
|
|
ubi_wl_close(ubi);
|
|
out_vtbl:
|
|
vfree(ubi->vtbl);
|
|
out_si:
|
|
ubi_scan_destroy_si(si);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* io_init - initialize I/O unit for a given UBI device.
|
|
* @ubi: UBI device description object
|
|
*
|
|
* If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are
|
|
* assumed:
|
|
* o EC header is always at offset zero - this cannot be changed;
|
|
* o VID header starts just after the EC header at the closest address
|
|
* aligned to @io->hdrs_min_io_size;
|
|
* o data starts just after the VID header at the closest address aligned to
|
|
* @io->min_io_size
|
|
*
|
|
* This function returns zero in case of success and a negative error code in
|
|
* case of failure.
|
|
*/
|
|
static int io_init(struct ubi_device *ubi)
|
|
{
|
|
if (ubi->mtd->numeraseregions != 0) {
|
|
/*
|
|
* Some flashes have several erase regions. Different regions
|
|
* may have different eraseblock size and other
|
|
* characteristics. It looks like mostly multi-region flashes
|
|
* have one "main" region and one or more small regions to
|
|
* store boot loader code or boot parameters or whatever. I
|
|
* guess we should just pick the largest region. But this is
|
|
* not implemented.
|
|
*/
|
|
ubi_err("multiple regions, not implemented");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ubi->vid_hdr_offset < 0)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Note, in this implementation we support MTD devices with 0x7FFFFFFF
|
|
* physical eraseblocks maximum.
|
|
*/
|
|
|
|
ubi->peb_size = ubi->mtd->erasesize;
|
|
ubi->peb_count = mtd_div_by_eb(ubi->mtd->size, ubi->mtd);
|
|
ubi->flash_size = ubi->mtd->size;
|
|
|
|
if (ubi->mtd->block_isbad && ubi->mtd->block_markbad)
|
|
ubi->bad_allowed = 1;
|
|
|
|
ubi->min_io_size = ubi->mtd->writesize;
|
|
ubi->hdrs_min_io_size = ubi->mtd->writesize >> ubi->mtd->subpage_sft;
|
|
|
|
/*
|
|
* Make sure minimal I/O unit is power of 2. Note, there is no
|
|
* fundamental reason for this assumption. It is just an optimization
|
|
* which allows us to avoid costly division operations.
|
|
*/
|
|
if (!is_power_of_2(ubi->min_io_size)) {
|
|
ubi_err("min. I/O unit (%d) is not power of 2",
|
|
ubi->min_io_size);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ubi_assert(ubi->hdrs_min_io_size > 0);
|
|
ubi_assert(ubi->hdrs_min_io_size <= ubi->min_io_size);
|
|
ubi_assert(ubi->min_io_size % ubi->hdrs_min_io_size == 0);
|
|
|
|
/* Calculate default aligned sizes of EC and VID headers */
|
|
ubi->ec_hdr_alsize = ALIGN(UBI_EC_HDR_SIZE, ubi->hdrs_min_io_size);
|
|
ubi->vid_hdr_alsize = ALIGN(UBI_VID_HDR_SIZE, ubi->hdrs_min_io_size);
|
|
|
|
dbg_msg("min_io_size %d", ubi->min_io_size);
|
|
dbg_msg("hdrs_min_io_size %d", ubi->hdrs_min_io_size);
|
|
dbg_msg("ec_hdr_alsize %d", ubi->ec_hdr_alsize);
|
|
dbg_msg("vid_hdr_alsize %d", ubi->vid_hdr_alsize);
|
|
|
|
if (ubi->vid_hdr_offset == 0)
|
|
/* Default offset */
|
|
ubi->vid_hdr_offset = ubi->vid_hdr_aloffset =
|
|
ubi->ec_hdr_alsize;
|
|
else {
|
|
ubi->vid_hdr_aloffset = ubi->vid_hdr_offset &
|
|
~(ubi->hdrs_min_io_size - 1);
|
|
ubi->vid_hdr_shift = ubi->vid_hdr_offset -
|
|
ubi->vid_hdr_aloffset;
|
|
}
|
|
|
|
/* Similar for the data offset */
|
|
ubi->leb_start = ubi->vid_hdr_offset + UBI_EC_HDR_SIZE;
|
|
ubi->leb_start = ALIGN(ubi->leb_start, ubi->min_io_size);
|
|
|
|
dbg_msg("vid_hdr_offset %d", ubi->vid_hdr_offset);
|
|
dbg_msg("vid_hdr_aloffset %d", ubi->vid_hdr_aloffset);
|
|
dbg_msg("vid_hdr_shift %d", ubi->vid_hdr_shift);
|
|
dbg_msg("leb_start %d", ubi->leb_start);
|
|
|
|
/* The shift must be aligned to 32-bit boundary */
|
|
if (ubi->vid_hdr_shift % 4) {
|
|
ubi_err("unaligned VID header shift %d",
|
|
ubi->vid_hdr_shift);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Check sanity */
|
|
if (ubi->vid_hdr_offset < UBI_EC_HDR_SIZE ||
|
|
ubi->leb_start < ubi->vid_hdr_offset + UBI_VID_HDR_SIZE ||
|
|
ubi->leb_start > ubi->peb_size - UBI_VID_HDR_SIZE ||
|
|
ubi->leb_start & (ubi->min_io_size - 1)) {
|
|
ubi_err("bad VID header (%d) or data offsets (%d)",
|
|
ubi->vid_hdr_offset, ubi->leb_start);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* It may happen that EC and VID headers are situated in one minimal
|
|
* I/O unit. In this case we can only accept this UBI image in
|
|
* read-only mode.
|
|
*/
|
|
if (ubi->vid_hdr_offset + UBI_VID_HDR_SIZE <= ubi->hdrs_min_io_size) {
|
|
ubi_warn("EC and VID headers are in the same minimal I/O unit, "
|
|
"switch to read-only mode");
|
|
ubi->ro_mode = 1;
|
|
}
|
|
|
|
ubi->leb_size = ubi->peb_size - ubi->leb_start;
|
|
|
|
if (!(ubi->mtd->flags & MTD_WRITEABLE)) {
|
|
ubi_msg("MTD device %d is write-protected, attach in "
|
|
"read-only mode", ubi->mtd->index);
|
|
ubi->ro_mode = 1;
|
|
}
|
|
|
|
ubi_msg("physical eraseblock size: %d bytes (%d KiB)",
|
|
ubi->peb_size, ubi->peb_size >> 10);
|
|
ubi_msg("logical eraseblock size: %d bytes", ubi->leb_size);
|
|
ubi_msg("smallest flash I/O unit: %d", ubi->min_io_size);
|
|
if (ubi->hdrs_min_io_size != ubi->min_io_size)
|
|
ubi_msg("sub-page size: %d",
|
|
ubi->hdrs_min_io_size);
|
|
ubi_msg("VID header offset: %d (aligned %d)",
|
|
ubi->vid_hdr_offset, ubi->vid_hdr_aloffset);
|
|
ubi_msg("data offset: %d", ubi->leb_start);
|
|
|
|
/*
|
|
* Note, ideally, we have to initialize ubi->bad_peb_count here. But
|
|
* unfortunately, MTD does not provide this information. We should loop
|
|
* over all physical eraseblocks and invoke mtd->block_is_bad() for
|
|
* each physical eraseblock. So, we skip ubi->bad_peb_count
|
|
* uninitialized and initialize it after scanning.
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* autoresize - re-size the volume which has the "auto-resize" flag set.
|
|
* @ubi: UBI device description object
|
|
* @vol_id: ID of the volume to re-size
|
|
*
|
|
* This function re-sizes the volume marked by the @UBI_VTBL_AUTORESIZE_FLG in
|
|
* the volume table to the largest possible size. See comments in ubi-header.h
|
|
* for more description of the flag. Returns zero in case of success and a
|
|
* negative error code in case of failure.
|
|
*/
|
|
static int autoresize(struct ubi_device *ubi, int vol_id)
|
|
{
|
|
struct ubi_volume_desc desc;
|
|
struct ubi_volume *vol = ubi->volumes[vol_id];
|
|
int err, old_reserved_pebs = vol->reserved_pebs;
|
|
|
|
/*
|
|
* Clear the auto-resize flag in the volume in-memory copy of the
|
|
* volume table, and 'ubi_resize_volume()' will propogate this change
|
|
* to the flash.
|
|
*/
|
|
ubi->vtbl[vol_id].flags &= ~UBI_VTBL_AUTORESIZE_FLG;
|
|
|
|
if (ubi->avail_pebs == 0) {
|
|
struct ubi_vtbl_record vtbl_rec;
|
|
|
|
/*
|
|
* No avalilable PEBs to re-size the volume, clear the flag on
|
|
* flash and exit.
|
|
*/
|
|
memcpy(&vtbl_rec, &ubi->vtbl[vol_id],
|
|
sizeof(struct ubi_vtbl_record));
|
|
err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
|
|
if (err)
|
|
ubi_err("cannot clean auto-resize flag for volume %d",
|
|
vol_id);
|
|
} else {
|
|
desc.vol = vol;
|
|
err = ubi_resize_volume(&desc,
|
|
old_reserved_pebs + ubi->avail_pebs);
|
|
if (err)
|
|
ubi_err("cannot auto-resize volume %d", vol_id);
|
|
}
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
ubi_msg("volume %d (\"%s\") re-sized from %d to %d LEBs", vol_id,
|
|
vol->name, old_reserved_pebs, vol->reserved_pebs);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ubi_attach_mtd_dev - attach an MTD device.
|
|
* @mtd_dev: MTD device description object
|
|
* @ubi_num: number to assign to the new UBI device
|
|
* @vid_hdr_offset: VID header offset
|
|
*
|
|
* This function attaches MTD device @mtd_dev to UBI and assign @ubi_num number
|
|
* to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in
|
|
* which case this function finds a vacant device nubert and assings it
|
|
* automatically. Returns the new UBI device number in case of success and a
|
|
* negative error code in case of failure.
|
|
*
|
|
* Note, the invocations of this function has to be serialized by the
|
|
* @ubi_devices_mutex.
|
|
*/
|
|
int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
|
|
{
|
|
struct ubi_device *ubi;
|
|
int i, err;
|
|
|
|
/*
|
|
* Check if we already have the same MTD device attached.
|
|
*
|
|
* Note, this function assumes that UBI devices creations and deletions
|
|
* are serialized, so it does not take the &ubi_devices_lock.
|
|
*/
|
|
for (i = 0; i < UBI_MAX_DEVICES; i++) {
|
|
ubi = ubi_devices[i];
|
|
if (ubi && mtd->index == ubi->mtd->index) {
|
|
dbg_err("mtd%d is already attached to ubi%d",
|
|
mtd->index, i);
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Make sure this MTD device is not emulated on top of an UBI volume
|
|
* already. Well, generally this recursion works fine, but there are
|
|
* different problems like the UBI module takes a reference to itself
|
|
* by attaching (and thus, opening) the emulated MTD device. This
|
|
* results in inability to unload the module. And in general it makes
|
|
* no sense to attach emulated MTD devices, so we prohibit this.
|
|
*/
|
|
if (mtd->type == MTD_UBIVOLUME) {
|
|
ubi_err("refuse attaching mtd%d - it is already emulated on "
|
|
"top of UBI", mtd->index);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ubi_num == UBI_DEV_NUM_AUTO) {
|
|
/* Search for an empty slot in the @ubi_devices array */
|
|
for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++)
|
|
if (!ubi_devices[ubi_num])
|
|
break;
|
|
if (ubi_num == UBI_MAX_DEVICES) {
|
|
dbg_err("only %d UBI devices may be created", UBI_MAX_DEVICES);
|
|
return -ENFILE;
|
|
}
|
|
} else {
|
|
if (ubi_num >= UBI_MAX_DEVICES)
|
|
return -EINVAL;
|
|
|
|
/* Make sure ubi_num is not busy */
|
|
if (ubi_devices[ubi_num]) {
|
|
dbg_err("ubi%d already exists", ubi_num);
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
|
|
ubi = kzalloc(sizeof(struct ubi_device), GFP_KERNEL);
|
|
if (!ubi)
|
|
return -ENOMEM;
|
|
|
|
ubi->mtd = mtd;
|
|
ubi->ubi_num = ubi_num;
|
|
ubi->vid_hdr_offset = vid_hdr_offset;
|
|
ubi->autoresize_vol_id = -1;
|
|
|
|
mutex_init(&ubi->buf_mutex);
|
|
mutex_init(&ubi->ckvol_mutex);
|
|
mutex_init(&ubi->volumes_mutex);
|
|
spin_lock_init(&ubi->volumes_lock);
|
|
|
|
ubi_msg("attaching mtd%d to ubi%d", mtd->index, ubi_num);
|
|
|
|
err = io_init(ubi);
|
|
if (err)
|
|
goto out_free;
|
|
|
|
err = -ENOMEM;
|
|
ubi->peb_buf1 = vmalloc(ubi->peb_size);
|
|
if (!ubi->peb_buf1)
|
|
goto out_free;
|
|
|
|
ubi->peb_buf2 = vmalloc(ubi->peb_size);
|
|
if (!ubi->peb_buf2)
|
|
goto out_free;
|
|
|
|
#ifdef CONFIG_MTD_UBI_DEBUG
|
|
mutex_init(&ubi->dbg_buf_mutex);
|
|
ubi->dbg_peb_buf = vmalloc(ubi->peb_size);
|
|
if (!ubi->dbg_peb_buf)
|
|
goto out_free;
|
|
#endif
|
|
|
|
err = attach_by_scanning(ubi);
|
|
if (err) {
|
|
dbg_err("failed to attach by scanning, error %d", err);
|
|
goto out_free;
|
|
}
|
|
|
|
if (ubi->autoresize_vol_id != -1) {
|
|
err = autoresize(ubi, ubi->autoresize_vol_id);
|
|
if (err)
|
|
goto out_detach;
|
|
}
|
|
|
|
err = uif_init(ubi);
|
|
if (err)
|
|
goto out_detach;
|
|
|
|
ubi->bgt_thread = kthread_create(ubi_thread, ubi, ubi->bgt_name);
|
|
if (IS_ERR(ubi->bgt_thread)) {
|
|
err = PTR_ERR(ubi->bgt_thread);
|
|
ubi_err("cannot spawn \"%s\", error %d", ubi->bgt_name,
|
|
err);
|
|
goto out_uif;
|
|
}
|
|
|
|
ubi_msg("attached mtd%d to ubi%d", mtd->index, ubi_num);
|
|
ubi_msg("MTD device name: \"%s\"", mtd->name);
|
|
ubi_msg("MTD device size: %llu MiB", ubi->flash_size >> 20);
|
|
ubi_msg("number of good PEBs: %d", ubi->good_peb_count);
|
|
ubi_msg("number of bad PEBs: %d", ubi->bad_peb_count);
|
|
ubi_msg("max. allowed volumes: %d", ubi->vtbl_slots);
|
|
ubi_msg("wear-leveling threshold: %d", CONFIG_MTD_UBI_WL_THRESHOLD);
|
|
ubi_msg("number of internal volumes: %d", UBI_INT_VOL_COUNT);
|
|
ubi_msg("number of user volumes: %d",
|
|
ubi->vol_count - UBI_INT_VOL_COUNT);
|
|
ubi_msg("available PEBs: %d", ubi->avail_pebs);
|
|
ubi_msg("total number of reserved PEBs: %d", ubi->rsvd_pebs);
|
|
ubi_msg("number of PEBs reserved for bad PEB handling: %d",
|
|
ubi->beb_rsvd_pebs);
|
|
ubi_msg("max/mean erase counter: %d/%d", ubi->max_ec, ubi->mean_ec);
|
|
|
|
/* Enable the background thread */
|
|
if (!DBG_DISABLE_BGT) {
|
|
ubi->thread_enabled = 1;
|
|
wake_up_process(ubi->bgt_thread);
|
|
}
|
|
|
|
ubi_devices[ubi_num] = ubi;
|
|
return ubi_num;
|
|
|
|
out_uif:
|
|
uif_close(ubi);
|
|
out_detach:
|
|
ubi_eba_close(ubi);
|
|
ubi_wl_close(ubi);
|
|
vfree(ubi->vtbl);
|
|
out_free:
|
|
vfree(ubi->peb_buf1);
|
|
vfree(ubi->peb_buf2);
|
|
#ifdef CONFIG_MTD_UBI_DEBUG
|
|
vfree(ubi->dbg_peb_buf);
|
|
#endif
|
|
kfree(ubi);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ubi_detach_mtd_dev - detach an MTD device.
|
|
* @ubi_num: UBI device number to detach from
|
|
* @anyway: detach MTD even if device reference count is not zero
|
|
*
|
|
* This function destroys an UBI device number @ubi_num and detaches the
|
|
* underlying MTD device. Returns zero in case of success and %-EBUSY if the
|
|
* UBI device is busy and cannot be destroyed, and %-EINVAL if it does not
|
|
* exist.
|
|
*
|
|
* Note, the invocations of this function has to be serialized by the
|
|
* @ubi_devices_mutex.
|
|
*/
|
|
int ubi_detach_mtd_dev(int ubi_num, int anyway)
|
|
{
|
|
struct ubi_device *ubi;
|
|
|
|
if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
|
|
return -EINVAL;
|
|
|
|
spin_lock(&ubi_devices_lock);
|
|
ubi = ubi_devices[ubi_num];
|
|
if (!ubi) {
|
|
spin_unlock(&ubi_devices_lock);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ubi->ref_count) {
|
|
if (!anyway) {
|
|
spin_unlock(&ubi_devices_lock);
|
|
return -EBUSY;
|
|
}
|
|
/* This may only happen if there is a bug */
|
|
ubi_err("%s reference count %d, destroy anyway",
|
|
ubi->ubi_name, ubi->ref_count);
|
|
}
|
|
ubi_devices[ubi_num] = NULL;
|
|
spin_unlock(&ubi_devices_lock);
|
|
|
|
ubi_assert(ubi_num == ubi->ubi_num);
|
|
dbg_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num);
|
|
|
|
/*
|
|
* Before freeing anything, we have to stop the background thread to
|
|
* prevent it from doing anything on this device while we are freeing.
|
|
*/
|
|
if (ubi->bgt_thread)
|
|
kthread_stop(ubi->bgt_thread);
|
|
|
|
uif_close(ubi);
|
|
ubi_eba_close(ubi);
|
|
ubi_wl_close(ubi);
|
|
vfree(ubi->vtbl);
|
|
put_mtd_device(ubi->mtd);
|
|
vfree(ubi->peb_buf1);
|
|
vfree(ubi->peb_buf2);
|
|
#ifdef CONFIG_MTD_UBI_DEBUG
|
|
vfree(ubi->dbg_peb_buf);
|
|
#endif
|
|
ubi_msg("mtd%d is detached from ubi%d", ubi->mtd->index, ubi->ubi_num);
|
|
kfree(ubi);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* find_mtd_device - open an MTD device by its name or number.
|
|
* @mtd_dev: name or number of the device
|
|
*
|
|
* This function tries to open and MTD device described by @mtd_dev string,
|
|
* which is first treated as an ASCII number, and if it is not true, it is
|
|
* treated as MTD device name. Returns MTD device description object in case of
|
|
* success and a negative error code in case of failure.
|
|
*/
|
|
static struct mtd_info * __init open_mtd_device(const char *mtd_dev)
|
|
{
|
|
struct mtd_info *mtd;
|
|
int mtd_num;
|
|
char *endp;
|
|
|
|
mtd_num = simple_strtoul(mtd_dev, &endp, 0);
|
|
if (*endp != '\0' || mtd_dev == endp) {
|
|
/*
|
|
* This does not look like an ASCII integer, probably this is
|
|
* MTD device name.
|
|
*/
|
|
mtd = get_mtd_device_nm(mtd_dev);
|
|
} else
|
|
mtd = get_mtd_device(NULL, mtd_num);
|
|
|
|
return mtd;
|
|
}
|
|
|
|
int __init ubi_init(void)
|
|
{
|
|
int err, i, k;
|
|
|
|
/* Ensure that EC and VID headers have correct size */
|
|
BUILD_BUG_ON(sizeof(struct ubi_ec_hdr) != 64);
|
|
BUILD_BUG_ON(sizeof(struct ubi_vid_hdr) != 64);
|
|
|
|
if (mtd_devs > UBI_MAX_DEVICES) {
|
|
ubi_err("too many MTD devices, maximum is %d", UBI_MAX_DEVICES);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Create base sysfs directory and sysfs files */
|
|
ubi_class = class_create(THIS_MODULE, UBI_NAME_STR);
|
|
if (IS_ERR(ubi_class)) {
|
|
err = PTR_ERR(ubi_class);
|
|
ubi_err("cannot create UBI class");
|
|
goto out;
|
|
}
|
|
|
|
err = class_create_file(ubi_class, &ubi_version);
|
|
if (err) {
|
|
ubi_err("cannot create sysfs file");
|
|
goto out_class;
|
|
}
|
|
|
|
err = misc_register(&ubi_ctrl_cdev);
|
|
if (err) {
|
|
ubi_err("cannot register device");
|
|
goto out_version;
|
|
}
|
|
|
|
#ifdef UBI_LINUX
|
|
ubi_wl_entry_slab = kmem_cache_create("ubi_wl_entry_slab",
|
|
sizeof(struct ubi_wl_entry),
|
|
0, 0, NULL);
|
|
if (!ubi_wl_entry_slab)
|
|
goto out_dev_unreg;
|
|
#endif
|
|
|
|
/* Attach MTD devices */
|
|
for (i = 0; i < mtd_devs; i++) {
|
|
struct mtd_dev_param *p = &mtd_dev_param[i];
|
|
struct mtd_info *mtd;
|
|
|
|
cond_resched();
|
|
|
|
mtd = open_mtd_device(p->name);
|
|
if (IS_ERR(mtd)) {
|
|
err = PTR_ERR(mtd);
|
|
goto out_detach;
|
|
}
|
|
|
|
mutex_lock(&ubi_devices_mutex);
|
|
err = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO,
|
|
p->vid_hdr_offs);
|
|
mutex_unlock(&ubi_devices_mutex);
|
|
if (err < 0) {
|
|
put_mtd_device(mtd);
|
|
ubi_err("cannot attach mtd%d", mtd->index);
|
|
goto out_detach;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_detach:
|
|
for (k = 0; k < i; k++)
|
|
if (ubi_devices[k]) {
|
|
mutex_lock(&ubi_devices_mutex);
|
|
ubi_detach_mtd_dev(ubi_devices[k]->ubi_num, 1);
|
|
mutex_unlock(&ubi_devices_mutex);
|
|
}
|
|
#ifdef UBI_LINUX
|
|
kmem_cache_destroy(ubi_wl_entry_slab);
|
|
out_dev_unreg:
|
|
#endif
|
|
misc_deregister(&ubi_ctrl_cdev);
|
|
out_version:
|
|
class_remove_file(ubi_class, &ubi_version);
|
|
out_class:
|
|
class_destroy(ubi_class);
|
|
out:
|
|
ubi_err("UBI error: cannot initialize UBI, error %d", err);
|
|
return err;
|
|
}
|
|
module_init(ubi_init);
|
|
|
|
void __exit ubi_exit(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < UBI_MAX_DEVICES; i++)
|
|
if (ubi_devices[i]) {
|
|
mutex_lock(&ubi_devices_mutex);
|
|
ubi_detach_mtd_dev(ubi_devices[i]->ubi_num, 1);
|
|
mutex_unlock(&ubi_devices_mutex);
|
|
}
|
|
kmem_cache_destroy(ubi_wl_entry_slab);
|
|
misc_deregister(&ubi_ctrl_cdev);
|
|
class_remove_file(ubi_class, &ubi_version);
|
|
class_destroy(ubi_class);
|
|
mtd_devs = 0;
|
|
}
|
|
module_exit(ubi_exit);
|
|
|
|
/**
|
|
* bytes_str_to_int - convert a string representing number of bytes to an
|
|
* integer.
|
|
* @str: the string to convert
|
|
*
|
|
* This function returns positive resulting integer in case of success and a
|
|
* negative error code in case of failure.
|
|
*/
|
|
static int __init bytes_str_to_int(const char *str)
|
|
{
|
|
char *endp;
|
|
unsigned long result;
|
|
|
|
result = simple_strtoul(str, &endp, 0);
|
|
if (str == endp || result < 0) {
|
|
printk(KERN_ERR "UBI error: incorrect bytes count: \"%s\"\n",
|
|
str);
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (*endp) {
|
|
case 'G':
|
|
result *= 1024;
|
|
case 'M':
|
|
result *= 1024;
|
|
case 'K':
|
|
result *= 1024;
|
|
if (endp[1] == 'i' && endp[2] == 'B')
|
|
endp += 2;
|
|
case '\0':
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "UBI error: incorrect bytes count: \"%s\"\n",
|
|
str);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* ubi_mtd_param_parse - parse the 'mtd=' UBI parameter.
|
|
* @val: the parameter value to parse
|
|
* @kp: not used
|
|
*
|
|
* This function returns zero in case of success and a negative error code in
|
|
* case of error.
|
|
*/
|
|
int __init ubi_mtd_param_parse(const char *val, struct kernel_param *kp)
|
|
{
|
|
int i, len;
|
|
struct mtd_dev_param *p;
|
|
char buf[MTD_PARAM_LEN_MAX];
|
|
char *pbuf = &buf[0];
|
|
char *tokens[2] = {NULL, NULL};
|
|
|
|
if (!val)
|
|
return -EINVAL;
|
|
|
|
if (mtd_devs == UBI_MAX_DEVICES) {
|
|
printk(KERN_ERR "UBI error: too many parameters, max. is %d\n",
|
|
UBI_MAX_DEVICES);
|
|
return -EINVAL;
|
|
}
|
|
|
|
len = strnlen(val, MTD_PARAM_LEN_MAX);
|
|
if (len == MTD_PARAM_LEN_MAX) {
|
|
printk(KERN_ERR "UBI error: parameter \"%s\" is too long, "
|
|
"max. is %d\n", val, MTD_PARAM_LEN_MAX);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (len == 0) {
|
|
printk(KERN_WARNING "UBI warning: empty 'mtd=' parameter - "
|
|
"ignored\n");
|
|
return 0;
|
|
}
|
|
|
|
strcpy(buf, val);
|
|
|
|
/* Get rid of the final newline */
|
|
if (buf[len - 1] == '\n')
|
|
buf[len - 1] = '\0';
|
|
|
|
for (i = 0; i < 2; i++)
|
|
tokens[i] = strsep(&pbuf, ",");
|
|
|
|
if (pbuf) {
|
|
printk(KERN_ERR "UBI error: too many arguments at \"%s\"\n",
|
|
val);
|
|
return -EINVAL;
|
|
}
|
|
|
|
p = &mtd_dev_param[mtd_devs];
|
|
strcpy(&p->name[0], tokens[0]);
|
|
|
|
if (tokens[1])
|
|
p->vid_hdr_offs = bytes_str_to_int(tokens[1]);
|
|
|
|
if (p->vid_hdr_offs < 0)
|
|
return p->vid_hdr_offs;
|
|
|
|
mtd_devs += 1;
|
|
return 0;
|
|
}
|
|
|
|
module_param_call(mtd, ubi_mtd_param_parse, NULL, NULL, 000);
|
|
MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: "
|
|
"mtd=<name|num>[,<vid_hdr_offs>].\n"
|
|
"Multiple \"mtd\" parameters may be specified.\n"
|
|
"MTD devices may be specified by their number or name.\n"
|
|
"Optional \"vid_hdr_offs\" parameter specifies UBI VID "
|
|
"header position and data starting position to be used "
|
|
"by UBI.\n"
|
|
"Example: mtd=content,1984 mtd=4 - attach MTD device"
|
|
"with name \"content\" using VID header offset 1984, and "
|
|
"MTD device number 4 with default VID header offset.");
|
|
|
|
MODULE_VERSION(__stringify(UBI_VERSION));
|
|
MODULE_DESCRIPTION("UBI - Unsorted Block Images");
|
|
MODULE_AUTHOR("Artem Bityutskiy");
|
|
MODULE_LICENSE("GPL");
|