UBI: Add basic UBI support to U-Boot (Part 3/8)
This patch adds basic UBI (Unsorted Block Image) support to U-Boot. It's based on the Linux UBI version and basically has a "OS" translation wrapper that defines most Linux specific calls (spin_lock() etc.) into no-ops. Some source code parts have been uncommented by "#ifdef UBI_LINUX". This makes it easier to compare this version with the Linux version and simplifies future UBI ports/bug-fixes from the Linux version. Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Kyungmin Park
Stefan Roese
parent
961df83361
commit
2d262c4853
1274
drivers/mtd/ubi/io.c
Normal file
1274
drivers/mtd/ubi/io.c
Normal file
File diff suppressed because it is too large
Load Diff
638
drivers/mtd/ubi/kapi.c
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638
drivers/mtd/ubi/kapi.c
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@ -0,0 +1,638 @@
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/*
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* Copyright (c) International Business Machines Corp., 2006
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Artem Bityutskiy (Битюцкий Артём)
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*/
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/* This file mostly implements UBI kernel API functions */
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#ifdef UBI_LINUX
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#include <linux/module.h>
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#include <linux/err.h>
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#include <asm/div64.h>
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#endif
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#include <ubi_uboot.h>
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#include "ubi.h"
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/**
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* ubi_get_device_info - get information about UBI device.
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* @ubi_num: UBI device number
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* @di: the information is stored here
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*
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* This function returns %0 in case of success, %-EINVAL if the UBI device
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* number is invalid, and %-ENODEV if there is no such UBI device.
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*/
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int ubi_get_device_info(int ubi_num, struct ubi_device_info *di)
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{
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struct ubi_device *ubi;
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if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
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return -EINVAL;
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ubi = ubi_get_device(ubi_num);
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if (!ubi)
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return -ENODEV;
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di->ubi_num = ubi->ubi_num;
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di->leb_size = ubi->leb_size;
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di->min_io_size = ubi->min_io_size;
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di->ro_mode = ubi->ro_mode;
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di->cdev = ubi->cdev.dev;
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ubi_put_device(ubi);
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return 0;
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}
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EXPORT_SYMBOL_GPL(ubi_get_device_info);
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/**
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* ubi_get_volume_info - get information about UBI volume.
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* @desc: volume descriptor
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* @vi: the information is stored here
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*/
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void ubi_get_volume_info(struct ubi_volume_desc *desc,
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struct ubi_volume_info *vi)
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{
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const struct ubi_volume *vol = desc->vol;
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const struct ubi_device *ubi = vol->ubi;
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vi->vol_id = vol->vol_id;
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vi->ubi_num = ubi->ubi_num;
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vi->size = vol->reserved_pebs;
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vi->used_bytes = vol->used_bytes;
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vi->vol_type = vol->vol_type;
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vi->corrupted = vol->corrupted;
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vi->upd_marker = vol->upd_marker;
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vi->alignment = vol->alignment;
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vi->usable_leb_size = vol->usable_leb_size;
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vi->name_len = vol->name_len;
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vi->name = vol->name;
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vi->cdev = vol->cdev.dev;
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}
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EXPORT_SYMBOL_GPL(ubi_get_volume_info);
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/**
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* ubi_open_volume - open UBI volume.
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* @ubi_num: UBI device number
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* @vol_id: volume ID
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* @mode: open mode
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*
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* The @mode parameter specifies if the volume should be opened in read-only
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* mode, read-write mode, or exclusive mode. The exclusive mode guarantees that
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* nobody else will be able to open this volume. UBI allows to have many volume
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* readers and one writer at a time.
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*
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* If a static volume is being opened for the first time since boot, it will be
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* checked by this function, which means it will be fully read and the CRC
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* checksum of each logical eraseblock will be checked.
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*
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* This function returns volume descriptor in case of success and a negative
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* error code in case of failure.
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*/
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struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode)
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{
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int err;
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struct ubi_volume_desc *desc;
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struct ubi_device *ubi;
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struct ubi_volume *vol;
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dbg_msg("open device %d volume %d, mode %d", ubi_num, vol_id, mode);
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if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
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return ERR_PTR(-EINVAL);
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if (mode != UBI_READONLY && mode != UBI_READWRITE &&
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mode != UBI_EXCLUSIVE)
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return ERR_PTR(-EINVAL);
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/*
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* First of all, we have to get the UBI device to prevent its removal.
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*/
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ubi = ubi_get_device(ubi_num);
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if (!ubi)
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return ERR_PTR(-ENODEV);
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if (vol_id < 0 || vol_id >= ubi->vtbl_slots) {
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err = -EINVAL;
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goto out_put_ubi;
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}
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desc = kmalloc(sizeof(struct ubi_volume_desc), GFP_KERNEL);
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if (!desc) {
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err = -ENOMEM;
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goto out_put_ubi;
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}
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err = -ENODEV;
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if (!try_module_get(THIS_MODULE))
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goto out_free;
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spin_lock(&ubi->volumes_lock);
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vol = ubi->volumes[vol_id];
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if (!vol)
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goto out_unlock;
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err = -EBUSY;
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switch (mode) {
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case UBI_READONLY:
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if (vol->exclusive)
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goto out_unlock;
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vol->readers += 1;
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break;
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case UBI_READWRITE:
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if (vol->exclusive || vol->writers > 0)
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goto out_unlock;
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vol->writers += 1;
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break;
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case UBI_EXCLUSIVE:
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if (vol->exclusive || vol->writers || vol->readers)
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goto out_unlock;
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vol->exclusive = 1;
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break;
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}
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get_device(&vol->dev);
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vol->ref_count += 1;
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spin_unlock(&ubi->volumes_lock);
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desc->vol = vol;
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desc->mode = mode;
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mutex_lock(&ubi->ckvol_mutex);
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if (!vol->checked) {
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/* This is the first open - check the volume */
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err = ubi_check_volume(ubi, vol_id);
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if (err < 0) {
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mutex_unlock(&ubi->ckvol_mutex);
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ubi_close_volume(desc);
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return ERR_PTR(err);
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}
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if (err == 1) {
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ubi_warn("volume %d on UBI device %d is corrupted",
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vol_id, ubi->ubi_num);
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vol->corrupted = 1;
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}
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vol->checked = 1;
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}
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mutex_unlock(&ubi->ckvol_mutex);
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return desc;
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out_unlock:
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spin_unlock(&ubi->volumes_lock);
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module_put(THIS_MODULE);
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out_free:
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kfree(desc);
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out_put_ubi:
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ubi_put_device(ubi);
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL_GPL(ubi_open_volume);
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/**
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* ubi_open_volume_nm - open UBI volume by name.
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* @ubi_num: UBI device number
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* @name: volume name
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* @mode: open mode
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*
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* This function is similar to 'ubi_open_volume()', but opens a volume by name.
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*/
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struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name,
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int mode)
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{
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int i, vol_id = -1, len;
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struct ubi_device *ubi;
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struct ubi_volume_desc *ret;
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dbg_msg("open volume %s, mode %d", name, mode);
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if (!name)
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return ERR_PTR(-EINVAL);
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len = strnlen(name, UBI_VOL_NAME_MAX + 1);
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if (len > UBI_VOL_NAME_MAX)
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return ERR_PTR(-EINVAL);
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if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
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return ERR_PTR(-EINVAL);
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ubi = ubi_get_device(ubi_num);
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if (!ubi)
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return ERR_PTR(-ENODEV);
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spin_lock(&ubi->volumes_lock);
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/* Walk all volumes of this UBI device */
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for (i = 0; i < ubi->vtbl_slots; i++) {
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struct ubi_volume *vol = ubi->volumes[i];
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if (vol && len == vol->name_len && !strcmp(name, vol->name)) {
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vol_id = i;
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break;
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}
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}
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spin_unlock(&ubi->volumes_lock);
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if (vol_id >= 0)
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ret = ubi_open_volume(ubi_num, vol_id, mode);
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else
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ret = ERR_PTR(-ENODEV);
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/*
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* We should put the UBI device even in case of success, because
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* 'ubi_open_volume()' took a reference as well.
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*/
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ubi_put_device(ubi);
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return ret;
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}
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EXPORT_SYMBOL_GPL(ubi_open_volume_nm);
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/**
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* ubi_close_volume - close UBI volume.
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* @desc: volume descriptor
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*/
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void ubi_close_volume(struct ubi_volume_desc *desc)
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{
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struct ubi_volume *vol = desc->vol;
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struct ubi_device *ubi = vol->ubi;
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dbg_msg("close volume %d, mode %d", vol->vol_id, desc->mode);
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spin_lock(&ubi->volumes_lock);
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switch (desc->mode) {
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case UBI_READONLY:
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vol->readers -= 1;
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break;
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case UBI_READWRITE:
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vol->writers -= 1;
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break;
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case UBI_EXCLUSIVE:
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vol->exclusive = 0;
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}
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vol->ref_count -= 1;
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spin_unlock(&ubi->volumes_lock);
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kfree(desc);
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put_device(&vol->dev);
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ubi_put_device(ubi);
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module_put(THIS_MODULE);
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}
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EXPORT_SYMBOL_GPL(ubi_close_volume);
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/**
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* ubi_leb_read - read data.
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* @desc: volume descriptor
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* @lnum: logical eraseblock number to read from
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* @buf: buffer where to store the read data
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* @offset: offset within the logical eraseblock to read from
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* @len: how many bytes to read
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* @check: whether UBI has to check the read data's CRC or not.
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*
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* This function reads data from offset @offset of logical eraseblock @lnum and
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* stores the data at @buf. When reading from static volumes, @check specifies
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* whether the data has to be checked or not. If yes, the whole logical
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* eraseblock will be read and its CRC checksum will be checked (i.e., the CRC
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* checksum is per-eraseblock). So checking may substantially slow down the
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* read speed. The @check argument is ignored for dynamic volumes.
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*
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* In case of success, this function returns zero. In case of failure, this
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* function returns a negative error code.
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*
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* %-EBADMSG error code is returned:
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* o for both static and dynamic volumes if MTD driver has detected a data
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* integrity problem (unrecoverable ECC checksum mismatch in case of NAND);
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* o for static volumes in case of data CRC mismatch.
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*
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* If the volume is damaged because of an interrupted update this function just
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* returns immediately with %-EBADF error code.
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*/
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int ubi_leb_read(struct ubi_volume_desc *desc, int lnum, char *buf, int offset,
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int len, int check)
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{
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struct ubi_volume *vol = desc->vol;
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struct ubi_device *ubi = vol->ubi;
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int err, vol_id = vol->vol_id;
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dbg_msg("read %d bytes from LEB %d:%d:%d", len, vol_id, lnum, offset);
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if (vol_id < 0 || vol_id >= ubi->vtbl_slots || lnum < 0 ||
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lnum >= vol->used_ebs || offset < 0 || len < 0 ||
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offset + len > vol->usable_leb_size)
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return -EINVAL;
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if (vol->vol_type == UBI_STATIC_VOLUME) {
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if (vol->used_ebs == 0)
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/* Empty static UBI volume */
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return 0;
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if (lnum == vol->used_ebs - 1 &&
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offset + len > vol->last_eb_bytes)
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return -EINVAL;
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}
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if (vol->upd_marker)
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return -EBADF;
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if (len == 0)
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return 0;
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err = ubi_eba_read_leb(ubi, vol, lnum, buf, offset, len, check);
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if (err && err == -EBADMSG && vol->vol_type == UBI_STATIC_VOLUME) {
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ubi_warn("mark volume %d as corrupted", vol_id);
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vol->corrupted = 1;
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(ubi_leb_read);
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/**
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* ubi_leb_write - write data.
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* @desc: volume descriptor
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* @lnum: logical eraseblock number to write to
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* @buf: data to write
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* @offset: offset within the logical eraseblock where to write
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* @len: how many bytes to write
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* @dtype: expected data type
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*
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* This function writes @len bytes of data from @buf to offset @offset of
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* logical eraseblock @lnum. The @dtype argument describes expected lifetime of
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* the data.
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*
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* This function takes care of physical eraseblock write failures. If write to
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* the physical eraseblock write operation fails, the logical eraseblock is
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* re-mapped to another physical eraseblock, the data is recovered, and the
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* write finishes. UBI has a pool of reserved physical eraseblocks for this.
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*
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* If all the data were successfully written, zero is returned. If an error
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* occurred and UBI has not been able to recover from it, this function returns
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* a negative error code. Note, in case of an error, it is possible that
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* something was still written to the flash media, but that may be some
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* garbage.
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*
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* If the volume is damaged because of an interrupted update this function just
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* returns immediately with %-EBADF code.
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*/
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int ubi_leb_write(struct ubi_volume_desc *desc, int lnum, const void *buf,
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int offset, int len, int dtype)
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{
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struct ubi_volume *vol = desc->vol;
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struct ubi_device *ubi = vol->ubi;
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int vol_id = vol->vol_id;
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dbg_msg("write %d bytes to LEB %d:%d:%d", len, vol_id, lnum, offset);
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if (vol_id < 0 || vol_id >= ubi->vtbl_slots)
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return -EINVAL;
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if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
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return -EROFS;
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if (lnum < 0 || lnum >= vol->reserved_pebs || offset < 0 || len < 0 ||
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offset + len > vol->usable_leb_size ||
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offset & (ubi->min_io_size - 1) || len & (ubi->min_io_size - 1))
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return -EINVAL;
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if (dtype != UBI_LONGTERM && dtype != UBI_SHORTTERM &&
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dtype != UBI_UNKNOWN)
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return -EINVAL;
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if (vol->upd_marker)
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return -EBADF;
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if (len == 0)
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return 0;
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return ubi_eba_write_leb(ubi, vol, lnum, buf, offset, len, dtype);
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}
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EXPORT_SYMBOL_GPL(ubi_leb_write);
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/*
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* ubi_leb_change - change logical eraseblock atomically.
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* @desc: volume descriptor
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* @lnum: logical eraseblock number to change
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* @buf: data to write
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* @len: how many bytes to write
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* @dtype: expected data type
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*
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* This function changes the contents of a logical eraseblock atomically. @buf
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* has to contain new logical eraseblock data, and @len - the length of the
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* data, which has to be aligned. The length may be shorter then the logical
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* eraseblock size, ant the logical eraseblock may be appended to more times
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* later on. This function guarantees that in case of an unclean reboot the old
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* contents is preserved. Returns zero in case of success and a negative error
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* code in case of failure.
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*/
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int ubi_leb_change(struct ubi_volume_desc *desc, int lnum, const void *buf,
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int len, int dtype)
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{
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struct ubi_volume *vol = desc->vol;
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struct ubi_device *ubi = vol->ubi;
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int vol_id = vol->vol_id;
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dbg_msg("atomically write %d bytes to LEB %d:%d", len, vol_id, lnum);
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if (vol_id < 0 || vol_id >= ubi->vtbl_slots)
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return -EINVAL;
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if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
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return -EROFS;
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|
||||
if (lnum < 0 || lnum >= vol->reserved_pebs || len < 0 ||
|
||||
len > vol->usable_leb_size || len & (ubi->min_io_size - 1))
|
||||
return -EINVAL;
|
||||
|
||||
if (dtype != UBI_LONGTERM && dtype != UBI_SHORTTERM &&
|
||||
dtype != UBI_UNKNOWN)
|
||||
return -EINVAL;
|
||||
|
||||
if (vol->upd_marker)
|
||||
return -EBADF;
|
||||
|
||||
if (len == 0)
|
||||
return 0;
|
||||
|
||||
return ubi_eba_atomic_leb_change(ubi, vol, lnum, buf, len, dtype);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ubi_leb_change);
|
||||
|
||||
/**
|
||||
* ubi_leb_erase - erase logical eraseblock.
|
||||
* @desc: volume descriptor
|
||||
* @lnum: logical eraseblock number
|
||||
*
|
||||
* This function un-maps logical eraseblock @lnum and synchronously erases the
|
||||
* correspondent physical eraseblock. Returns zero in case of success and a
|
||||
* negative error code in case of failure.
|
||||
*
|
||||
* If the volume is damaged because of an interrupted update this function just
|
||||
* returns immediately with %-EBADF code.
|
||||
*/
|
||||
int ubi_leb_erase(struct ubi_volume_desc *desc, int lnum)
|
||||
{
|
||||
struct ubi_volume *vol = desc->vol;
|
||||
struct ubi_device *ubi = vol->ubi;
|
||||
int err;
|
||||
|
||||
dbg_msg("erase LEB %d:%d", vol->vol_id, lnum);
|
||||
|
||||
if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
|
||||
return -EROFS;
|
||||
|
||||
if (lnum < 0 || lnum >= vol->reserved_pebs)
|
||||
return -EINVAL;
|
||||
|
||||
if (vol->upd_marker)
|
||||
return -EBADF;
|
||||
|
||||
err = ubi_eba_unmap_leb(ubi, vol, lnum);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
return ubi_wl_flush(ubi);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ubi_leb_erase);
|
||||
|
||||
/**
|
||||
* ubi_leb_unmap - un-map logical eraseblock.
|
||||
* @desc: volume descriptor
|
||||
* @lnum: logical eraseblock number
|
||||
*
|
||||
* This function un-maps logical eraseblock @lnum and schedules the
|
||||
* corresponding physical eraseblock for erasure, so that it will eventually be
|
||||
* physically erased in background. This operation is much faster then the
|
||||
* erase operation.
|
||||
*
|
||||
* Unlike erase, the un-map operation does not guarantee that the logical
|
||||
* eraseblock will contain all 0xFF bytes when UBI is initialized again. For
|
||||
* example, if several logical eraseblocks are un-mapped, and an unclean reboot
|
||||
* happens after this, the logical eraseblocks will not necessarily be
|
||||
* un-mapped again when this MTD device is attached. They may actually be
|
||||
* mapped to the same physical eraseblocks again. So, this function has to be
|
||||
* used with care.
|
||||
*
|
||||
* In other words, when un-mapping a logical eraseblock, UBI does not store
|
||||
* any information about this on the flash media, it just marks the logical
|
||||
* eraseblock as "un-mapped" in RAM. If UBI is detached before the physical
|
||||
* eraseblock is physically erased, it will be mapped again to the same logical
|
||||
* eraseblock when the MTD device is attached again.
|
||||
*
|
||||
* The main and obvious use-case of this function is when the contents of a
|
||||
* logical eraseblock has to be re-written. Then it is much more efficient to
|
||||
* first un-map it, then write new data, rather then first erase it, then write
|
||||
* new data. Note, once new data has been written to the logical eraseblock,
|
||||
* UBI guarantees that the old contents has gone forever. In other words, if an
|
||||
* unclean reboot happens after the logical eraseblock has been un-mapped and
|
||||
* then written to, it will contain the last written data.
|
||||
*
|
||||
* This function returns zero in case of success and a negative error code in
|
||||
* case of failure. If the volume is damaged because of an interrupted update
|
||||
* this function just returns immediately with %-EBADF code.
|
||||
*/
|
||||
int ubi_leb_unmap(struct ubi_volume_desc *desc, int lnum)
|
||||
{
|
||||
struct ubi_volume *vol = desc->vol;
|
||||
struct ubi_device *ubi = vol->ubi;
|
||||
|
||||
dbg_msg("unmap LEB %d:%d", vol->vol_id, lnum);
|
||||
|
||||
if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
|
||||
return -EROFS;
|
||||
|
||||
if (lnum < 0 || lnum >= vol->reserved_pebs)
|
||||
return -EINVAL;
|
||||
|
||||
if (vol->upd_marker)
|
||||
return -EBADF;
|
||||
|
||||
return ubi_eba_unmap_leb(ubi, vol, lnum);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ubi_leb_unmap);
|
||||
|
||||
/**
|
||||
* ubi_leb_map - map logical erasblock to a physical eraseblock.
|
||||
* @desc: volume descriptor
|
||||
* @lnum: logical eraseblock number
|
||||
* @dtype: expected data type
|
||||
*
|
||||
* This function maps an un-mapped logical eraseblock @lnum to a physical
|
||||
* eraseblock. This means, that after a successfull invocation of this
|
||||
* function the logical eraseblock @lnum will be empty (contain only %0xFF
|
||||
* bytes) and be mapped to a physical eraseblock, even if an unclean reboot
|
||||
* happens.
|
||||
*
|
||||
* This function returns zero in case of success, %-EBADF if the volume is
|
||||
* damaged because of an interrupted update, %-EBADMSG if the logical
|
||||
* eraseblock is already mapped, and other negative error codes in case of
|
||||
* other failures.
|
||||
*/
|
||||
int ubi_leb_map(struct ubi_volume_desc *desc, int lnum, int dtype)
|
||||
{
|
||||
struct ubi_volume *vol = desc->vol;
|
||||
struct ubi_device *ubi = vol->ubi;
|
||||
|
||||
dbg_msg("unmap LEB %d:%d", vol->vol_id, lnum);
|
||||
|
||||
if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
|
||||
return -EROFS;
|
||||
|
||||
if (lnum < 0 || lnum >= vol->reserved_pebs)
|
||||
return -EINVAL;
|
||||
|
||||
if (dtype != UBI_LONGTERM && dtype != UBI_SHORTTERM &&
|
||||
dtype != UBI_UNKNOWN)
|
||||
return -EINVAL;
|
||||
|
||||
if (vol->upd_marker)
|
||||
return -EBADF;
|
||||
|
||||
if (vol->eba_tbl[lnum] >= 0)
|
||||
return -EBADMSG;
|
||||
|
||||
return ubi_eba_write_leb(ubi, vol, lnum, NULL, 0, 0, dtype);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ubi_leb_map);
|
||||
|
||||
/**
|
||||
* ubi_is_mapped - check if logical eraseblock is mapped.
|
||||
* @desc: volume descriptor
|
||||
* @lnum: logical eraseblock number
|
||||
*
|
||||
* This function checks if logical eraseblock @lnum is mapped to a physical
|
||||
* eraseblock. If a logical eraseblock is un-mapped, this does not necessarily
|
||||
* mean it will still be un-mapped after the UBI device is re-attached. The
|
||||
* logical eraseblock may become mapped to the physical eraseblock it was last
|
||||
* mapped to.
|
||||
*
|
||||
* This function returns %1 if the LEB is mapped, %0 if not, and a negative
|
||||
* error code in case of failure. If the volume is damaged because of an
|
||||
* interrupted update this function just returns immediately with %-EBADF error
|
||||
* code.
|
||||
*/
|
||||
int ubi_is_mapped(struct ubi_volume_desc *desc, int lnum)
|
||||
{
|
||||
struct ubi_volume *vol = desc->vol;
|
||||
|
||||
dbg_msg("test LEB %d:%d", vol->vol_id, lnum);
|
||||
|
||||
if (lnum < 0 || lnum >= vol->reserved_pebs)
|
||||
return -EINVAL;
|
||||
|
||||
if (vol->upd_marker)
|
||||
return -EBADF;
|
||||
|
||||
return vol->eba_tbl[lnum] >= 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ubi_is_mapped);
|
||||
106
drivers/mtd/ubi/misc.c
Normal file
106
drivers/mtd/ubi/misc.c
Normal file
@ -0,0 +1,106 @@
|
||||
/*
|
||||
* Copyright (c) International Business Machines Corp., 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)
|
||||
*/
|
||||
|
||||
/* Here we keep miscellaneous functions which are used all over the UBI code */
|
||||
|
||||
#include <ubi_uboot.h>
|
||||
#include "ubi.h"
|
||||
|
||||
/**
|
||||
* calc_data_len - calculate how much real data is stored in a buffer.
|
||||
* @ubi: UBI device description object
|
||||
* @buf: a buffer with the contents of the physical eraseblock
|
||||
* @length: the buffer length
|
||||
*
|
||||
* This function calculates how much "real data" is stored in @buf and returnes
|
||||
* the length. Continuous 0xFF bytes at the end of the buffer are not
|
||||
* considered as "real data".
|
||||
*/
|
||||
int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf,
|
||||
int length)
|
||||
{
|
||||
int i;
|
||||
|
||||
ubi_assert(!(length & (ubi->min_io_size - 1)));
|
||||
|
||||
for (i = length - 1; i >= 0; i--)
|
||||
if (((const uint8_t *)buf)[i] != 0xFF)
|
||||
break;
|
||||
|
||||
/* The resulting length must be aligned to the minimum flash I/O size */
|
||||
length = ALIGN(i + 1, ubi->min_io_size);
|
||||
return length;
|
||||
}
|
||||
|
||||
/**
|
||||
* ubi_check_volume - check the contents of a static volume.
|
||||
* @ubi: UBI device description object
|
||||
* @vol_id: ID of the volume to check
|
||||
*
|
||||
* This function checks if static volume @vol_id is corrupted by fully reading
|
||||
* it and checking data CRC. This function returns %0 if the volume is not
|
||||
* corrupted, %1 if it is corrupted and a negative error code in case of
|
||||
* failure. Dynamic volumes are not checked and zero is returned immediately.
|
||||
*/
|
||||
int ubi_check_volume(struct ubi_device *ubi, int vol_id)
|
||||
{
|
||||
void *buf;
|
||||
int err = 0, i;
|
||||
struct ubi_volume *vol = ubi->volumes[vol_id];
|
||||
|
||||
if (vol->vol_type != UBI_STATIC_VOLUME)
|
||||
return 0;
|
||||
|
||||
buf = vmalloc(vol->usable_leb_size);
|
||||
if (!buf)
|
||||
return -ENOMEM;
|
||||
|
||||
for (i = 0; i < vol->used_ebs; i++) {
|
||||
int size;
|
||||
|
||||
if (i == vol->used_ebs - 1)
|
||||
size = vol->last_eb_bytes;
|
||||
else
|
||||
size = vol->usable_leb_size;
|
||||
|
||||
err = ubi_eba_read_leb(ubi, vol, i, buf, 0, size, 1);
|
||||
if (err) {
|
||||
if (err == -EBADMSG)
|
||||
err = 1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
vfree(buf);
|
||||
return err;
|
||||
}
|
||||
|
||||
/**
|
||||
* ubi_calculate_rsvd_pool - calculate how many PEBs must be reserved for bad
|
||||
* eraseblock handling.
|
||||
* @ubi: UBI device description object
|
||||
*/
|
||||
void ubi_calculate_reserved(struct ubi_device *ubi)
|
||||
{
|
||||
ubi->beb_rsvd_level = ubi->good_peb_count/100;
|
||||
ubi->beb_rsvd_level *= CONFIG_MTD_UBI_BEB_RESERVE;
|
||||
if (ubi->beb_rsvd_level < MIN_RESEVED_PEBS)
|
||||
ubi->beb_rsvd_level = MIN_RESEVED_PEBS;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user