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/*
* Copyright (C) 2008 Nokia Corporation
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Author: Artem Bityutskiy
*
* UBI scanning library.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <stdint.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <mtd_swab.h>
#include <mtd/ubi-header.h>
#include <mtd/mtd-user.h>
#include <libmtd.h>
#include <libscan.h>
#include "common.h"
#include "crc32.h"
#define PROGRAM_NAME "libscan"
static int all_ff(const void *buf, int len)
{
int i;
const uint8_t *p = buf;
for (i = 0; i < len; i++)
if (p[i] != 0xFF)
return 0;
return 1;
}
int ubi_scan(struct mtd_info *mtd, struct ubi_scan_info **info, int verbose)
{
int eb, v = (verbose == 2), pr = (verbose == 1);
struct ubi_scan_info *si;
unsigned long long sum = 0;
si = calloc(1, sizeof(struct ubi_scan_info));
if (!si)
return sys_errmsg("cannot allocate %zd bytes of memory",
sizeof(struct ubi_scan_info));
si->ec = calloc(mtd->eb_cnt, sizeof(uint32_t));
if (!si->ec) {
sys_errmsg("cannot allocate %zd bytes of memory",
sizeof(struct ubi_scan_info));
goto out_si;
}
si->vid_hdr_offs = si->data_offs = -1;
verbose(v, "start scanning eraseblocks 0-%d", mtd->eb_cnt);
for (eb = 0; eb < mtd->eb_cnt; eb++) {
int ret;
uint32_t crc;
struct ubi_ec_hdr hdr;
unsigned long long ec;
if (v) {
normsg_cont("scanning eraseblock %d", eb);
fflush(stdout);
}
if (pr) {
printf("\r" PROGRAM_NAME ": scanning eraseblock %d -- %2lld %% complete ",
eb, (long long)(eb + 1) * 100 / mtd->eb_cnt);
fflush(stdout);
}
ret = mtd_is_bad(mtd, eb);
if (ret == -1)
goto out_ec;
if (ret) {
si->bad_cnt += 1;
si->ec[eb] = EB_BAD;
if (v)
printf(": bad\n");
continue;
}
ret = mtd_read(mtd, eb, 0, &hdr, sizeof(struct ubi_ec_hdr));;
if (ret < 0)
goto out_ec;
/* Check the EC header */
if (be32_to_cpu(hdr.magic) != UBI_EC_HDR_MAGIC) {
if (all_ff(&hdr, sizeof(struct ubi_ec_hdr))) {
si->empty_cnt += 1;
si->ec[eb] = EB_EMPTY;
if (v)
printf(": empty\n");
} else {
si->alien_cnt += 1;
si->ec[eb] = EB_ALIEN;
if (v)
printf(": alien\n");
}
continue;
}
crc = crc32(UBI_CRC32_INIT, &hdr, UBI_EC_HDR_SIZE_CRC);
if (be32_to_cpu(hdr.hdr_crc) != crc) {
si->corrupted_cnt += 1;
si->ec[eb] = EB_CORRUPTED;
if (v)
printf(": bad CRC %#08x, should be %#08x\n",
crc, be32_to_cpu(hdr.hdr_crc));
continue;
}
ec = be64_to_cpu(hdr.ec);
if (ec > EC_MAX) {
if (pr)
printf("\n");
errmsg("erase counter in EB %d is %llu, while this "
"program expects them to be less than %u",
eb, ec, EC_MAX);
goto out_ec;
}
if (si->vid_hdr_offs == -1) {
si->vid_hdr_offs = be32_to_cpu(hdr.vid_hdr_offset);
si->data_offs = be32_to_cpu(hdr.data_offset);
if (si->data_offs % mtd->min_io_size) {
if (pr)
printf("\n");
if (v)
printf(": corrupted because of the below\n");
warnmsg("bad data offset %d at eraseblock %d (n"
"of multiple of min. I/O unit size %d)",
si->data_offs, eb, mtd->min_io_size);
warnmsg("treat eraseblock %d as corrupted", eb);
si->corrupted_cnt += 1;
si->ec[eb] = EB_CORRUPTED;
continue;
}
} else {
if (be32_to_cpu(hdr.vid_hdr_offset) != si->vid_hdr_offs) {
if (pr)
printf("\n");
if (v)
printf(": corrupted because of the below\n");
warnmsg("inconsistent VID header offset: was "
"%d, but is %d in eraseblock %d",
si->vid_hdr_offs,
be32_to_cpu(hdr.vid_hdr_offset), eb);
warnmsg("treat eraseblock %d as corrupted", eb);
si->corrupted_cnt += 1;
si->ec[eb] = EB_CORRUPTED;
continue;
}
if (be32_to_cpu(hdr.data_offset) != si->data_offs) {
if (pr)
printf("\n");
if (v)
printf(": corrupted because of the below\n");
warnmsg("inconsistent data offset: was %d, but"
" is %d in eraseblock %d",
si->data_offs,
be32_to_cpu(hdr.data_offset), eb);
warnmsg("treat eraseblock %d as corrupted", eb);
si->corrupted_cnt += 1;
si->ec[eb] = EB_CORRUPTED;
continue;
}
}
si->ok_cnt += 1;
si->ec[eb] = ec;
if (v)
printf(": OK, erase counter %u\n", si->ec[eb]);
}
if (si->ok_cnt != 0) {
/* Calculate mean erase counter */
for (eb = 0; eb < mtd->eb_cnt; eb++) {
if (si->ec[eb] > EC_MAX)
continue;
sum += si->ec[eb];
}
si->mean_ec = sum / si->ok_cnt;
}
si->good_cnt = mtd->eb_cnt - si->bad_cnt;
verbose(v, "finished, mean EC %lld, %d OK, %d corrupted, %d empty, %d "
"alien, bad %d", si->mean_ec, si->ok_cnt, si->corrupted_cnt,
si->empty_cnt, si->alien_cnt, si->bad_cnt);
*info = si;
if (pr)
printf("\n");
return 0;
out_ec:
free(si->ec);
out_si:
free(si);
*info = NULL;
return -1;
}
void ubi_scan_free(struct ubi_scan_info *si)
{
free(si->ec);
free(si);
}
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