[PATCH 5/5] ubiformat: Cleanly umount and detach the ubi before formating

[Sascha Hauer]

Hi Markus,

On Tue, Mar 08, 2016 at 11:56:09AM +0100, Markus Pargmann wrote:
> This was an open fixme for some time. ubiformat does not care about used
> ubi volumes or attached ubis.
> 
> This patch adds functionality that umounts all filesystems that are
> mounted from this nand device. After that the ubi is detached. Then the
> normal ubiformat code reformats the ubi. If a ubi was detached
> previously, the code tries to reattach the ubi. Filesystems are not
> remounted.

Normally I would expect ubiformat to fail when the mtd is used by UBI.
Can we make the behaviour optional and by default fail if the mtd is
busy?

> +static int ubi_umount_all(const char *mtddev, struct mtd_info_user *ui,
> +			  int *ubi_detached_num)
> +{
> +	struct ubi_device_info ubi_info;
> +	struct cdev *ubi_cdev;
> +	struct fs_device_d *fsdev;
> +	struct fs_device_d *fsdev_tmp;
> +	struct ubi_device *ubi_dev;
> +	int ret;
> +	int ubi_num;
> +	int vol_id;
> +
> +
> +	ubi_num = ubi_num_get_by_mtd(ui->mtd);
> +	if (ubi_num < 0) /* No attached ubi found */
> +		return 0;
> +
> +	ubi_get_device_info(ubi_num, &ubi_info);
> +
> +	ubi_volume_for_each(ubi_num, ubi_dev, vol_id, ret) {
> +		struct ubi_volume_desc *vol;
> +
> +		vol = ubi_open_volume(ubi_num, vol_id, UBI_READONLY);
> +		if (IS_ERR(vol)) {
> +			pr_err("Failed to open ubi volume %d %d, %ld. Continuing\n",
> +			       ubi_num, vol_id, PTR_ERR(vol));
> +			continue;
> +		}
> +
> +		for_each_fs_device_safe(fsdev_tmp, fsdev) {
> +			ubi_cdev = ubi_volume_get_cdev(vol);
> +
> +			if (fsdev->cdev == ubi_volume_get_cdev(vol)) {
> +				ret = umount(fsdev->path);
> +				if (ret) {
> +					pr_err("Failed umounting %s, %d, continuing anyway\n",
> +					       fsdev->path, ret);
> +				}

Shouldn't this be an error?

Sascha

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