1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
/*
* Copyright (c) International Business Machines Corp., 2006
*
* SPDX-License-Identifier: GPL-2.0+
*
* 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 (mtd_is_eccerr(err))
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;
}
|
