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/* * Copyright (c) International Business Machines Corp., 2006 * Copyright (c) Nokia Corporation, 2006 * * 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) * * Jan 2007: Alexander Schmidt, hacked per-volume update. *//* * This file contains implementation of the volume update and atomic LEB change * functionality. * * The update operation is based on the per-volume update marker which is * stored in the volume table. The update marker is set before the update * starts, and removed after the update has been finished. So if the update was * interrupted by an unclean re-boot or due to some other reasons, the update * marker stays on the flash media and UBI finds it when it attaches the MTD * device next time. If the update marker is set for a volume, the volume is * treated as damaged and most I/O operations are prohibited. Only a new update * operation is allowed. * * Note, in general it is possible to implement the update operation as a * transaction with a roll-back capability. *//** * set_update_marker - set update marker. * @ubi: UBI device description object * @vol: volume description object * * This function sets the update marker flag for volume @vol. Returns zero * in case of success and a negative error code in case of failure. */static int set_update_marker(struct ubi_device *ubi, struct ubi_volume *vol){ int err; struct ubi_vtbl_record vtbl_rec; dbg_gen("set update marker for volume %d", vol->vol_id); if (vol->upd_marker) { ubi_assert(ubi->vtbl[vol->vol_id].upd_marker); dbg_gen("already set"); return 0; } vtbl_rec = ubi->vtbl[vol->vol_id]; vtbl_rec.upd_marker = 1; mutex_lock(&ubi->device_mutex); err = ubi_change_vtbl_record(ubi, vol->vol_id, &vtbl_rec); vol->upd_marker = 1; mutex_unlock(&ubi->device_mutex); return err;}/** * clear_update_marker - clear update marker. * @ubi: UBI device description object * @vol: volume description object * @bytes: new data size in bytes * * This function clears the update marker for volume @vol, sets new volume * data size and clears the "corrupted" flag (static volumes only). Returns * zero in case of success and a negative error code in case of failure. */static int clear_update_marker(struct ubi_device *ubi, struct ubi_volume *vol, long long bytes){ int err; struct ubi_vtbl_record vtbl_rec;