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    Subject[PATCH 05/20 take 4] UBI: startup code
    diff -auNrp tmp-from/drivers/mtd/ubi/build.c tmp-to/drivers/mtd/ubi/build.c
    --- tmp-from/drivers/mtd/ubi/build.c 1970-01-01 02:00:00.000000000 +0200
    +++ tmp-to/drivers/mtd/ubi/build.c 2007-03-23 18:20:01.000000000 +0200
    @@ -0,0 +1,843 @@
    +/*
    + * 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;
    +
    + 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 = ubi_align_up(UBI_EC_HDR_SIZE,
    + ubi->hdrs_min_io_size);
    + ubi->vid_hdr_alsize = ubi_align_up(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_align_down(ubi->vid_hdr_offset,
    + ubi->hdrs_min_io_size);
    + 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 = ubi_align_up(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% 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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      Last update: 2007-03-23 18:01    [W:0.075 / U:0.628 seconds]
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