blob: a6410bfb6bce4f82211cbdd8ee54401dadedbc77 [file] [log] [blame]
Kyungmin Park2d262c42008-11-19 16:26:54 +01001/*
2 * Copyright (c) International Business Machines Corp., 2006
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 * Author: Artem Bityutskiy (Битюцкий Артём)
19 */
20
21/* Here we keep miscellaneous functions which are used all over the UBI code */
22
23#include <ubi_uboot.h>
24#include "ubi.h"
25
26/**
27 * calc_data_len - calculate how much real data is stored in a buffer.
28 * @ubi: UBI device description object
29 * @buf: a buffer with the contents of the physical eraseblock
30 * @length: the buffer length
31 *
32 * This function calculates how much "real data" is stored in @buf and returnes
33 * the length. Continuous 0xFF bytes at the end of the buffer are not
34 * considered as "real data".
35 */
36int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf,
37 int length)
38{
39 int i;
40
41 ubi_assert(!(length & (ubi->min_io_size - 1)));
42
43 for (i = length - 1; i >= 0; i--)
44 if (((const uint8_t *)buf)[i] != 0xFF)
45 break;
46
47 /* The resulting length must be aligned to the minimum flash I/O size */
48 length = ALIGN(i + 1, ubi->min_io_size);
49 return length;
50}
51
52/**
53 * ubi_check_volume - check the contents of a static volume.
54 * @ubi: UBI device description object
55 * @vol_id: ID of the volume to check
56 *
57 * This function checks if static volume @vol_id is corrupted by fully reading
58 * it and checking data CRC. This function returns %0 if the volume is not
59 * corrupted, %1 if it is corrupted and a negative error code in case of
60 * failure. Dynamic volumes are not checked and zero is returned immediately.
61 */
62int ubi_check_volume(struct ubi_device *ubi, int vol_id)
63{
64 void *buf;
65 int err = 0, i;
66 struct ubi_volume *vol = ubi->volumes[vol_id];
67
68 if (vol->vol_type != UBI_STATIC_VOLUME)
69 return 0;
70
71 buf = vmalloc(vol->usable_leb_size);
72 if (!buf)
73 return -ENOMEM;
74
75 for (i = 0; i < vol->used_ebs; i++) {
76 int size;
77
78 if (i == vol->used_ebs - 1)
79 size = vol->last_eb_bytes;
80 else
81 size = vol->usable_leb_size;
82
83 err = ubi_eba_read_leb(ubi, vol, i, buf, 0, size, 1);
84 if (err) {
85 if (err == -EBADMSG)
86 err = 1;
87 break;
88 }
89 }
90
91 vfree(buf);
92 return err;
93}
94
95/**
96 * ubi_calculate_rsvd_pool - calculate how many PEBs must be reserved for bad
97 * eraseblock handling.
98 * @ubi: UBI device description object
99 */
100void ubi_calculate_reserved(struct ubi_device *ubi)
101{
102 ubi->beb_rsvd_level = ubi->good_peb_count/100;
103 ubi->beb_rsvd_level *= CONFIG_MTD_UBI_BEB_RESERVE;
104 if (ubi->beb_rsvd_level < MIN_RESEVED_PEBS)
105 ubi->beb_rsvd_level = MIN_RESEVED_PEBS;
106}