コード例 #1
0
ファイル: vmt.c プロジェクト: cherojeong/barebox
/**
 * ubi_add_volume - add volume.
 * @ubi: UBI device description object
 * @vol: volume description object
 *
 * This function adds an existing volume and initializes all its data
 * structures. Returns zero in case of success and a negative error code in
 * case of failure.
 */
int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol)
{
	int err = 0;

	dbg_gen("add volume");

	sprintf(vol->dev.name, "%s.%s", dev_name(&ubi->dev), vol->name);
	vol->dev.id = DEVICE_ID_SINGLE;
	vol->dev.parent = &ubi->dev;
	err = register_device(&vol->dev);
	if (err)
		return err;

	/* Register character device for the volume */
	err = ubi_volume_cdev_add(ubi, vol);
	if (err) {
		ubi_err(ubi, "cannot add character device for volume, error %d",
			err);
		return err;
	}

	self_check_volumes(ubi);
	return err;

	return err;
}
コード例 #2
0
ファイル: vmt.c プロジェクト: cherojeong/barebox
/**
 * ubi_rename_volumes - re-name UBI volumes.
 * @ubi: UBI device description object
 * @rename_list: list of &struct ubi_rename_entry objects
 *
 * This function re-names or removes volumes specified in the re-name list.
 * Returns zero in case of success and a negative error code in case of
 * failure.
 */
int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list)
{
	int err;
	struct ubi_rename_entry *re;

	err = ubi_vtbl_rename_volumes(ubi, rename_list);
	if (err)
		return err;

	list_for_each_entry(re, rename_list, list) {
		if (re->remove) {
			err = ubi_remove_volume(re->desc, 1);
			if (err)
				break;
		} else {
			struct ubi_volume *vol = re->desc->vol;

			vol->name_len = re->new_name_len;
			memcpy(vol->name, re->new_name, re->new_name_len + 1);
			ubi_volume_notify(ubi, vol, UBI_VOLUME_RENAMED);
		}
	}

	if (!err)
		self_check_volumes(ubi);
	return err;
}
コード例 #3
0
ファイル: vmt.c プロジェクト: cherojeong/barebox
/**
 * ubi_remove_volume - remove volume.
 * @desc: volume descriptor
 * @no_vtbl: do not change volume table if not zero
 *
 * This function removes volume described by @desc. The volume has to be opened
 * in "exclusive" mode. Returns zero in case of success and a negative error
 * code in case of failure. The caller has to have the @ubi->device_mutex
 * locked.
 */
int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl)
{
	struct ubi_volume *vol = desc->vol;
	struct ubi_device *ubi = vol->ubi;
	int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs;

	dbg_gen("remove device %d, volume %d", ubi->ubi_num, vol_id);
	ubi_assert(desc->mode == UBI_EXCLUSIVE);
	ubi_assert(vol == ubi->volumes[vol_id]);

	if (ubi->ro_mode)
		return -EROFS;

	if (vol->ref_count > 1) {
		/*
		 * The volume is busy, probably someone is reading one of its
		 * sysfs files.
		 */
		err = -EBUSY;
		goto out_unlock;
	}
	ubi->volumes[vol_id] = NULL;

	if (!no_vtbl) {
		err = ubi_change_vtbl_record(ubi, vol_id, NULL);
		if (err)
			goto out_err;
	}

	for (i = 0; i < vol->reserved_pebs; i++) {
		err = ubi_eba_unmap_leb(ubi, vol, i);
		if (err)
			goto out_err;
	}

	unregister_device(&vol->dev);
	devfs_remove(&vol->cdev);

	ubi->rsvd_pebs -= reserved_pebs;
	ubi->avail_pebs += reserved_pebs;
	ubi_update_reserved(ubi);
	ubi->vol_count -= 1;

	ubi_volume_notify(ubi, vol, UBI_VOLUME_REMOVED);
	if (!no_vtbl)
		self_check_volumes(ubi);

	return err;

out_err:
	ubi_err(ubi, "cannot remove volume %d, error %d", vol_id, err);
	ubi->volumes[vol_id] = vol;
out_unlock:
	return err;
}
コード例 #4
0
ファイル: vmt.c プロジェクト: AshishNamdev/barebox
/**
 * ubi_add_volume - add volume.
 * @ubi: UBI device description object
 * @vol: volume description object
 *
 * This function adds an existing volume and initializes all its data
 * structures. Returns zero in case of success and a negative error code in
 * case of failure.
 */
int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol)
{
	int err = 0;

	dbg_gen("add volume");

	/* Register character device for the volume */
	err = ubi_volume_cdev_add(ubi, vol);
	if (err) {
		ubi_err("cannot add character device for volume, error %d",
			err);
		return err;
	}

	self_check_volumes(ubi);
	return err;

	return err;
}
コード例 #5
0
ファイル: vmt.c プロジェクト: cherojeong/barebox
/**
 * ubi_create_volume - create volume.
 * @ubi: UBI device description object
 * @req: volume creation request
 *
 * This function creates volume described by @req. If @req->vol_id id
 * %UBI_VOL_NUM_AUTO, this function automatically assign ID to the new volume
 * and saves it in @req->vol_id. Returns zero in case of success and a negative
 * error code in case of failure. Note, the caller has to have the
 * @ubi->device_mutex locked.
 */
int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
{
	int i, err, vol_id = req->vol_id, do_free = 1;
	struct ubi_volume *vol;
	struct ubi_vtbl_record vtbl_rec;

	if (ubi->ro_mode)
		return -EROFS;

	vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
	if (!vol)
		return -ENOMEM;

	if (vol_id == UBI_VOL_NUM_AUTO) {
		/* Find unused volume ID */
		dbg_gen("search for vacant volume ID");
		for (i = 0; i < ubi->vtbl_slots; i++)
			if (!ubi->volumes[i]) {
				vol_id = i;
				break;
			}

		if (vol_id == UBI_VOL_NUM_AUTO) {
			ubi_err(ubi, "out of volume IDs");
			err = -ENFILE;
			goto out_unlock;
		}
		req->vol_id = vol_id;
	}

	dbg_gen("create device %d, volume %d, %llu bytes, type %d, name %s",
		ubi->ubi_num, vol_id, (unsigned long long)req->bytes,
		(int)req->vol_type, req->name);

	/* Ensure that this volume does not exist */
	err = -EEXIST;
	if (ubi->volumes[vol_id]) {
		ubi_err(ubi, "volume %d already exists", vol_id);
		goto out_unlock;
	}

	/* Ensure that the name is unique */
	for (i = 0; i < ubi->vtbl_slots; i++)
		if (ubi->volumes[i] &&
		    ubi->volumes[i]->name_len == req->name_len &&
		    !strcmp(ubi->volumes[i]->name, req->name)) {
			ubi_err(ubi, "volume \"%s\" exists (ID %d)",
				req->name, i);
			goto out_unlock;
		}

	/* Calculate how many eraseblocks are requested */
	vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment;
	vol->reserved_pebs = div_u64(req->bytes + vol->usable_leb_size - 1,
				     vol->usable_leb_size);

	/* Reserve physical eraseblocks */
	if (vol->reserved_pebs > ubi->avail_pebs) {
		ubi_err(ubi, "not enough PEBs, only %d available",
			ubi->avail_pebs);
		if (ubi->corr_peb_count)
			ubi_err(ubi, "%d PEBs are corrupted and not used",
				ubi->corr_peb_count);
		err = -ENOSPC;
		goto out_unlock;
	}
	ubi->avail_pebs -= vol->reserved_pebs;
	ubi->rsvd_pebs += vol->reserved_pebs;

	vol->vol_id    = vol_id;
	vol->alignment = req->alignment;
	vol->data_pad  = ubi->leb_size % vol->alignment;
	vol->vol_type  = req->vol_type;
	vol->name_len  = req->name_len;
	memcpy(vol->name, req->name, vol->name_len);
	vol->ubi = ubi;

	/*
	 * Finish all pending erases because there may be some LEBs belonging
	 * to the same volume ID.
	 */
	err = ubi_wl_flush(ubi, vol_id, UBI_ALL);
	if (err)
		goto out_acc;

	vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL);
	if (!vol->eba_tbl) {
		err = -ENOMEM;
		goto out_acc;
	}

	for (i = 0; i < vol->reserved_pebs; i++)
		vol->eba_tbl[i] = UBI_LEB_UNMAPPED;

	if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
		vol->used_ebs = vol->reserved_pebs;
		vol->last_eb_bytes = vol->usable_leb_size;
		vol->used_bytes =
			(long long)vol->used_ebs * vol->usable_leb_size;
	} else {
		vol->used_ebs = div_u64_rem(vol->used_bytes,
					    vol->usable_leb_size,
					    &vol->last_eb_bytes);
		if (vol->last_eb_bytes != 0)
			vol->used_ebs += 1;
		else
			vol->last_eb_bytes = vol->usable_leb_size;
	}

	sprintf(vol->dev.name, "%s.%s", dev_name(&ubi->dev), vol->name);
	vol->dev.id = DEVICE_ID_SINGLE;
	vol->dev.parent = &ubi->dev;
	err = register_device(&vol->dev);
	if (err)
		goto out_acc;

	/* Register character device for the volume */
	err = ubi_volume_cdev_add(ubi, vol);
	if (err) {
		ubi_err(ubi, "cannot add character device");
		goto out_mapping;
	}

	/* Fill volume table record */
	memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record));
	vtbl_rec.reserved_pebs = cpu_to_be32(vol->reserved_pebs);
	vtbl_rec.alignment     = cpu_to_be32(vol->alignment);
	vtbl_rec.data_pad      = cpu_to_be32(vol->data_pad);
	vtbl_rec.name_len      = cpu_to_be16(vol->name_len);
	if (vol->vol_type == UBI_DYNAMIC_VOLUME)
		vtbl_rec.vol_type = UBI_VID_DYNAMIC;
	else
		vtbl_rec.vol_type = UBI_VID_STATIC;
	memcpy(vtbl_rec.name, vol->name, vol->name_len);

	err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
	if (err)
		goto out_sysfs;

	ubi->volumes[vol_id] = vol;
	ubi->vol_count += 1;

	ubi_volume_notify(ubi, vol, UBI_VOLUME_ADDED);
	self_check_volumes(ubi);
	return err;

out_sysfs:
	/*
	 * We have registered our device, we should not free the volume
	 * description object in this function in case of an error - it is
	 * freed by the release function.
	 *
	 * Get device reference to prevent the release function from being
	 * called just after sysfs has been closed.
	 */
	do_free = 0;
out_mapping:
	if (do_free)
		kfree(vol->eba_tbl);
	unregister_device(&vol->dev);
out_acc:
	ubi->rsvd_pebs -= vol->reserved_pebs;
	ubi->avail_pebs += vol->reserved_pebs;
out_unlock:
	if (do_free)
		kfree(vol);

	ubi_err(ubi, "cannot create volume %d, error %d", vol_id, err);
	return err;
}
コード例 #6
0
ファイル: vmt.c プロジェクト: cherojeong/barebox
/**
 * ubi_resize_volume - re-size volume.
 * @desc: volume descriptor
 * @reserved_pebs: new size in physical eraseblocks
 *
 * This function re-sizes the volume and returns zero in case of success, and a
 * negative error code in case of failure. The caller has to have the
 * @ubi->device_mutex locked.
 */
int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
{
	int i, err, pebs, *new_mapping;
	struct ubi_volume *vol = desc->vol;
	struct ubi_device *ubi = vol->ubi;
	struct ubi_vtbl_record vtbl_rec;
	int vol_id = vol->vol_id;

	if (ubi->ro_mode)
		return -EROFS;

	dbg_gen("re-size device %d, volume %d to from %d to %d PEBs",
		ubi->ubi_num, vol_id, vol->reserved_pebs, reserved_pebs);

	if (vol->vol_type == UBI_STATIC_VOLUME &&
	    reserved_pebs < vol->used_ebs) {
		ubi_err(ubi, "too small size %d, %d LEBs contain data",
			reserved_pebs, vol->used_ebs);
		return -EINVAL;
	}

	/* If the size is the same, we have nothing to do */
	if (reserved_pebs == vol->reserved_pebs)
		return 0;

	new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL);
	if (!new_mapping)
		return -ENOMEM;

	for (i = 0; i < reserved_pebs; i++)
		new_mapping[i] = UBI_LEB_UNMAPPED;

	if (vol->ref_count > 1) {
		err = -EBUSY;
		goto out_free;
	}

	/* Reserve physical eraseblocks */
	pebs = reserved_pebs - vol->reserved_pebs;
	if (pebs > 0) {
		if (pebs > ubi->avail_pebs) {
			ubi_err(ubi, "not enough PEBs: requested %d, available %d",
				pebs, ubi->avail_pebs);
			if (ubi->corr_peb_count)
				ubi_err(ubi, "%d PEBs are corrupted and not used",
					ubi->corr_peb_count);
			err = -ENOSPC;
			goto out_free;
		}
		ubi->avail_pebs -= pebs;
		ubi->rsvd_pebs += pebs;
		for (i = 0; i < vol->reserved_pebs; i++)
			new_mapping[i] = vol->eba_tbl[i];
		kfree(vol->eba_tbl);
		vol->eba_tbl = new_mapping;
	}

	/* Change volume table record */
	vtbl_rec = ubi->vtbl[vol_id];
	vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs);
	err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
	if (err)
		goto out_acc;

	if (pebs < 0) {
		for (i = 0; i < -pebs; i++) {
			err = ubi_eba_unmap_leb(ubi, vol, reserved_pebs + i);
			if (err)
				goto out_acc;
		}
		ubi->rsvd_pebs += pebs;
		ubi->avail_pebs -= pebs;
		ubi_update_reserved(ubi);
		for (i = 0; i < reserved_pebs; i++)
			new_mapping[i] = vol->eba_tbl[i];
		kfree(vol->eba_tbl);
		vol->eba_tbl = new_mapping;
	}

	vol->reserved_pebs = reserved_pebs;
	if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
		vol->used_ebs = reserved_pebs;
		vol->last_eb_bytes = vol->usable_leb_size;
		vol->used_bytes =
			(long long)vol->used_ebs * vol->usable_leb_size;
	}

	ubi_volume_notify(ubi, vol, UBI_VOLUME_RESIZED);
	self_check_volumes(ubi);
	return err;

out_acc:
	if (pebs > 0) {
		ubi->rsvd_pebs -= pebs;
		ubi->avail_pebs += pebs;
	}
out_free:
	kfree(new_mapping);
	return err;
}