build.c

uboot200903最新版本的通用uboot

#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");