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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/drivers/mtd/ubi/build.c

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24 KiB
C
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/*
* 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. At the
* moment UBI devices may only be added while UBI is initialized, but dynamic
* device add/remove functionality is planned. Also, 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.
*/
#include <linux/err.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/stringify.h>
#include <linux/stat.h>
#include "ubi.h"
/* 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
* @data_offs: data offset
*/
struct mtd_dev_param
{
char name[MTD_PARAM_LEN_MAX];
int vid_hdr_offs;
int data_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];
/* Number of UBI devices in system */
int ubi_devices_cnt;
/* All UBI devices in system */
struct ubi_device *ubi_devices[UBI_MAX_DEVICES];
/* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */
struct class *ubi_class;
/* "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);
/* "Show" method for files in '/<sysfs>/class/ubi/ubiX/' */
static ssize_t dev_attribute_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
const struct ubi_device *ubi;
ubi = container_of(dev, struct ubi_device, dev);
if (attr == &dev_eraseblock_size)
return sprintf(buf, "%d\n", ubi->leb_size);
else if (attr == &dev_avail_eraseblocks)
return sprintf(buf, "%d\n", ubi->avail_pebs);
else if (attr == &dev_total_eraseblocks)
return sprintf(buf, "%d\n", ubi->good_peb_count);
else if (attr == &dev_volumes_count)
return sprintf(buf, "%d\n", ubi->vol_count);
else if (attr == &dev_max_ec)
return sprintf(buf, "%d\n", ubi->max_ec);
else if (attr == &dev_reserved_for_bad)
return sprintf(buf, "%d\n", ubi->beb_rsvd_pebs);
else if (attr == &dev_bad_peb_count)
return sprintf(buf, "%d\n", ubi->bad_peb_count);
else if (attr == &dev_max_vol_count)
return sprintf(buf, "%d\n", ubi->vtbl_slots);
else if (attr == &dev_min_io_size)
return sprintf(buf, "%d\n", ubi->min_io_size);
else if (attr == &dev_bgt_enabled)
return sprintf(buf, "%d\n", ubi->thread_enabled);
else
BUG();
return 0;
}
/* 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 = MKDEV(ubi->major, 0);
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)
goto out;
err = device_create_file(&ubi->dev, &dev_eraseblock_size);
if (err)
goto out_unregister;
err = device_create_file(&ubi->dev, &dev_avail_eraseblocks);
if (err)
goto out_eraseblock_size;
err = device_create_file(&ubi->dev, &dev_total_eraseblocks);
if (err)
goto out_avail_eraseblocks;
err = device_create_file(&ubi->dev, &dev_volumes_count);
if (err)
goto out_total_eraseblocks;
err = device_create_file(&ubi->dev, &dev_max_ec);
if (err)
goto out_volumes_count;
err = device_create_file(&ubi->dev, &dev_reserved_for_bad);
if (err)
goto out_volumes_max_ec;
err = device_create_file(&ubi->dev, &dev_bad_peb_count);
if (err)
goto out_reserved_for_bad;
err = device_create_file(&ubi->dev, &dev_max_vol_count);
if (err)
goto out_bad_peb_count;
err = device_create_file(&ubi->dev, &dev_min_io_size);
if (err)
goto out_max_vol_count;
err = device_create_file(&ubi->dev, &dev_bgt_enabled);
if (err)
goto out_min_io_size;
return 0;
out_min_io_size:
device_remove_file(&ubi->dev, &dev_min_io_size);
out_max_vol_count:
device_remove_file(&ubi->dev, &dev_max_vol_count);
out_bad_peb_count:
device_remove_file(&ubi->dev, &dev_bad_peb_count);
out_reserved_for_bad:
device_remove_file(&ubi->dev, &dev_reserved_for_bad);
out_volumes_max_ec:
device_remove_file(&ubi->dev, &dev_max_ec);
out_volumes_count:
device_remove_file(&ubi->dev, &dev_volumes_count);
out_total_eraseblocks:
device_remove_file(&ubi->dev, &dev_total_eraseblocks);
out_avail_eraseblocks:
device_remove_file(&ubi->dev, &dev_avail_eraseblocks);
out_eraseblock_size:
device_remove_file(&ubi->dev, &dev_eraseblock_size);
out_unregister:
device_unregister(&ubi->dev);
out:
ubi_err("failed to initialize sysfs for %s", ubi->ubi_name);
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_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);
}
/**
* 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, 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;
dev_t dev;
mutex_init(&ubi->vtbl_mutex);
spin_lock_init(&ubi->volumes_lock);
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;
}
cdev_init(&ubi->cdev, &ubi_cdev_operations);
ubi->major = MAJOR(dev);
dbg_msg("%s major is %u", ubi->ubi_name, ubi->major);
ubi->cdev.owner = THIS_MODULE;
dev = MKDEV(ubi->major, 0);
err = cdev_add(&ubi->cdev, dev, 1);
if (err) {
ubi_err("cannot add character device %s", ubi->ubi_name);
goto out_unreg;
}
err = ubi_sysfs_init(ubi);
if (err)
goto out_cdev;
for (i = 0; i < ubi->vtbl_slots; i++)
if (ubi->volumes[i]) {
err = ubi_add_volume(ubi, i);
if (err)
goto out_volumes;
}
return 0;
out_volumes:
kill_volumes(ubi);
ubi_sysfs_close(ubi);
out_cdev:
cdev_del(&ubi->cdev);
out_unreg:
unregister_chrdev_region(MKDEV(ubi->major, 0),
ubi->vtbl_slots + 1);
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(MKDEV(ubi->major, 0), 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:
kfree(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;
}
/*
* Note, in this implementation we support MTD devices with 0x7FFFFFFF
* physical eraseblocks maximum.
*/
ubi->peb_size = ubi->mtd->erasesize;
ubi->peb_count = ubi->mtd->size / ubi->mtd->erasesize;
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 */
if (ubi->min_io_size == 0 ||
(ubi->min_io_size & (ubi->min_io_size - 1))) {
ubi_err("bad min. I/O unit");
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 */
if (ubi->leb_start == 0) {
ubi->leb_start = ubi->vid_hdr_offset + ubi->vid_hdr_alsize;
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) {
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;
}
dbg_msg("leb_size %d", ubi->leb_size);
dbg_msg("ro_mode %d", ubi->ro_mode);
/*
* 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;
}
/**
* attach_mtd_dev - attach an MTD device.
* @mtd_dev: MTD device name or number string
* @vid_hdr_offset: VID header offset
* @data_offset: data offset
*
* This function attaches an MTD device to UBI. It first treats @mtd_dev as the
* MTD device name, and tries to open it by this name. If it is unable to open,
* it tries to convert @mtd_dev to an integer and open the MTD device by its
* number. Returns zero in case of success and a negative error code in case of
* failure.
*/
static int attach_mtd_dev(const char *mtd_dev, int vid_hdr_offset,
int data_offset)
{
struct ubi_device *ubi;
struct mtd_info *mtd;
int i, err;
mtd = get_mtd_device_nm(mtd_dev);
if (IS_ERR(mtd)) {
int mtd_num;
char *endp;
if (PTR_ERR(mtd) != -ENODEV)
return PTR_ERR(mtd);
/*
* Probably this is not MTD device name but MTD device number -
* check this out.
*/
mtd_num = simple_strtoul(mtd_dev, &endp, 0);
if (*endp != '\0' || mtd_dev == endp) {
ubi_err("incorrect MTD device: \"%s\"", mtd_dev);
return -ENODEV;
}
mtd = get_mtd_device(NULL, mtd_num);
if (IS_ERR(mtd))
return PTR_ERR(mtd);
}
/* Check if we already have the same MTD device attached */
for (i = 0; i < ubi_devices_cnt; i++)
if (ubi_devices[i]->mtd->index == mtd->index) {
ubi_err("mtd%d is already attached to ubi%d",
mtd->index, i);
err = -EINVAL;
goto out_mtd;
}
ubi = ubi_devices[ubi_devices_cnt] = kzalloc(sizeof(struct ubi_device),
GFP_KERNEL);
if (!ubi) {
err = -ENOMEM;
goto out_mtd;
}
ubi->ubi_num = ubi_devices_cnt;
ubi->mtd = mtd;
dbg_msg("attaching mtd%d to ubi%d: VID header offset %d data offset %d",
ubi->mtd->index, ubi_devices_cnt, vid_hdr_offset, data_offset);
ubi->vid_hdr_offset = vid_hdr_offset;
ubi->leb_start = data_offset;
err = io_init(ubi);
if (err)
goto out_free;
err = attach_by_scanning(ubi);
if (err) {
dbg_err("failed to attach by scanning, error %d", err);
goto out_free;
}
err = uif_init(ubi);
if (err)
goto out_detach;
ubi_devices_cnt += 1;
ubi_msg("attached mtd%d to ubi%d", ubi->mtd->index, ubi_devices_cnt);
ubi_msg("MTD device name: \"%s\"", ubi->mtd->name);
ubi_msg("MTD device size: %llu MiB", ubi->flash_size >> 20);
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("number of good PEBs: %d", ubi->good_peb_count);
ubi_msg("number of bad PEBs: %d", ubi->bad_peb_count);
ubi_msg("smallest flash I/O unit: %d", ubi->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);
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);
}
return 0;
out_detach:
ubi_eba_close(ubi);
ubi_wl_close(ubi);
kfree(ubi->vtbl);
out_free:
kfree(ubi);
out_mtd:
put_mtd_device(mtd);
ubi_devices[ubi_devices_cnt] = NULL;
return err;
}
/**
* detach_mtd_dev - detach an MTD device.
* @ubi: UBI device description object
*/
static void detach_mtd_dev(struct ubi_device *ubi)
{
int ubi_num = ubi->ubi_num, mtd_num = ubi->mtd->index;
dbg_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num);
uif_close(ubi);
ubi_eba_close(ubi);
ubi_wl_close(ubi);
kfree(ubi->vtbl);
put_mtd_device(ubi->mtd);
kfree(ubi_devices[ubi_num]);
ubi_devices[ubi_num] = NULL;
ubi_devices_cnt -= 1;
ubi_assert(ubi_devices_cnt >= 0);
ubi_msg("mtd%d is detached from ubi%d", mtd_num, ubi_num);
}
static 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) {
printk("UBI error: too many MTD devices, maximum is %d\n",
UBI_MAX_DEVICES);
return -EINVAL;
}
ubi_class = class_create(THIS_MODULE, UBI_NAME_STR);
if (IS_ERR(ubi_class))
return PTR_ERR(ubi_class);
err = class_create_file(ubi_class, &ubi_version);
if (err)
goto out_class;
/* Attach MTD devices */
for (i = 0; i < mtd_devs; i++) {
struct mtd_dev_param *p = &mtd_dev_param[i];
cond_resched();
if (!p->name) {
dbg_err("empty name");
err = -EINVAL;
goto out_detach;
}
err = attach_mtd_dev(p->name, p->vid_hdr_offs, p->data_offs);
if (err)
goto out_detach;
}
return 0;
out_detach:
for (k = 0; k < i; k++)
detach_mtd_dev(ubi_devices[k]);
class_remove_file(ubi_class, &ubi_version);
out_class:
class_destroy(ubi_class);
return err;
}
module_init(ubi_init);
static void __exit ubi_exit(void)
{
int i, n = ubi_devices_cnt;
for (i = 0; i < n; i++)
detach_mtd_dev(ubi_devices[i]);
class_remove_file(ubi_class, &ubi_version);
class_destroy(ubi_class);
}
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("UBI error: incorrect bytes count: \"%s\"\n", str);
return -EINVAL;
}
switch (*endp) {
case 'G':
result *= 1024;
case 'M':
result *= 1024;
case 'K':
case 'k':
result *= 1024;
if (endp[1] == 'i' && (endp[2] == '\0' ||
endp[2] == 'B' || endp[2] == 'b'))
endp += 2;
case '\0':
break;
default:
printk("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.
*/
static 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[3] = {NULL, NULL, NULL};
if (mtd_devs == UBI_MAX_DEVICES) {
printk("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("UBI error: parameter \"%s\" is too long, max. is %d\n",
val, MTD_PARAM_LEN_MAX);
return -EINVAL;
}
if (len == 0) {
printk("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 < 3; i++)
tokens[i] = strsep(&pbuf, ",");
if (pbuf) {
printk("UBI error: too many arguments at \"%s\"\n", val);
return -EINVAL;
}
if (tokens[0] == '\0')
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 (tokens[2])
p->data_offs = bytes_str_to_int(tokens[2]);
if (p->vid_hdr_offs < 0)
return p->vid_hdr_offs;
if (p->data_offs < 0)
return p->data_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>,<data_offs>]. "
"Multiple \"mtd\" parameters may be specified.\n"
"MTD devices may be specified by their number or name. "
"Optional \"vid_hdr_offs\" and \"data_offs\" parameters "
"specify UBI VID header position and data starting "
"position to be used by UBI.\n"
"Example: mtd=content,1984,2048 mtd=4 - attach MTD device"
"with name content using VID header offset 1984 and data "
"start 2048, and MTD device number 4 using default "
"offsets");
MODULE_VERSION(__stringify(UBI_VERSION));
MODULE_DESCRIPTION("UBI - Unsorted Block Images");
MODULE_AUTHOR("Artem Bityutskiy");
MODULE_LICENSE("GPL");
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