106 lines
3.1 KiB
C
106 lines
3.1 KiB
C
/*
|
|
* 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.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 == 0);
|
|
|
|
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 = kmalloc(vol->usable_leb_size, GFP_KERNEL);
|
|
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_id, i, buf, 0, size, 1);
|
|
if (err) {
|
|
if (err == -EBADMSG)
|
|
err = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
kfree(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;
|
|
}
|