![Ben Shelton](/assets/img/avatar_default.png)
Add a file under debugfs to allow easy access to the erase count for each physical erase block on an UBI device. This is useful when debugging data integrity issues with UBIFS on NAND flash devices. Signed-off-by: Ben Shelton <ben.shelton@ni.com> Signed-off-by: Zach Brown <zach.brown@ni.com> v2: * If ubi_io_is_bad eraseblk_count_seq_show just returns the err. * if ubi->lookuptbl returns null, its no longer treated as an error instead info for that block is not printeded * Removed check for UBI_MAX_ERASECOUNTER since it is impossible to hit * Removed block state from print, if a block is printed then it is good and if it is not printed, then it is bad. v3: * Remove errant ! symbol from if statement checking if erase count is valid. Signed-off-by: Richard Weinberger <richard@nod.at>
671 lines
18 KiB
C
671 lines
18 KiB
C
/*
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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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#include "ubi.h"
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#include <linux/debugfs.h>
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#include <linux/uaccess.h>
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#include <linux/module.h>
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#include <linux/seq_file.h>
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/**
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* ubi_dump_flash - dump a region of flash.
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* @ubi: UBI device description object
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* @pnum: the physical eraseblock number to dump
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* @offset: the starting offset within the physical eraseblock to dump
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* @len: the length of the region to dump
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*/
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void ubi_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len)
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{
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int err;
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size_t read;
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void *buf;
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loff_t addr = (loff_t)pnum * ubi->peb_size + offset;
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buf = vmalloc(len);
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if (!buf)
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return;
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err = mtd_read(ubi->mtd, addr, len, &read, buf);
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if (err && err != -EUCLEAN) {
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ubi_err(ubi, "err %d while reading %d bytes from PEB %d:%d, read %zd bytes",
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err, len, pnum, offset, read);
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goto out;
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}
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ubi_msg(ubi, "dumping %d bytes of data from PEB %d, offset %d",
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len, pnum, offset);
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print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1);
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out:
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vfree(buf);
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return;
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}
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/**
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* ubi_dump_ec_hdr - dump an erase counter header.
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* @ec_hdr: the erase counter header to dump
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*/
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void ubi_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr)
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{
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pr_err("Erase counter header dump:\n");
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pr_err("\tmagic %#08x\n", be32_to_cpu(ec_hdr->magic));
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pr_err("\tversion %d\n", (int)ec_hdr->version);
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pr_err("\tec %llu\n", (long long)be64_to_cpu(ec_hdr->ec));
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pr_err("\tvid_hdr_offset %d\n", be32_to_cpu(ec_hdr->vid_hdr_offset));
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pr_err("\tdata_offset %d\n", be32_to_cpu(ec_hdr->data_offset));
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pr_err("\timage_seq %d\n", be32_to_cpu(ec_hdr->image_seq));
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pr_err("\thdr_crc %#08x\n", be32_to_cpu(ec_hdr->hdr_crc));
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pr_err("erase counter header hexdump:\n");
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print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
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ec_hdr, UBI_EC_HDR_SIZE, 1);
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}
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/**
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* ubi_dump_vid_hdr - dump a volume identifier header.
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* @vid_hdr: the volume identifier header to dump
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*/
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void ubi_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr)
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{
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pr_err("Volume identifier header dump:\n");
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pr_err("\tmagic %08x\n", be32_to_cpu(vid_hdr->magic));
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pr_err("\tversion %d\n", (int)vid_hdr->version);
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pr_err("\tvol_type %d\n", (int)vid_hdr->vol_type);
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pr_err("\tcopy_flag %d\n", (int)vid_hdr->copy_flag);
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pr_err("\tcompat %d\n", (int)vid_hdr->compat);
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pr_err("\tvol_id %d\n", be32_to_cpu(vid_hdr->vol_id));
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pr_err("\tlnum %d\n", be32_to_cpu(vid_hdr->lnum));
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pr_err("\tdata_size %d\n", be32_to_cpu(vid_hdr->data_size));
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pr_err("\tused_ebs %d\n", be32_to_cpu(vid_hdr->used_ebs));
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pr_err("\tdata_pad %d\n", be32_to_cpu(vid_hdr->data_pad));
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pr_err("\tsqnum %llu\n",
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(unsigned long long)be64_to_cpu(vid_hdr->sqnum));
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pr_err("\thdr_crc %08x\n", be32_to_cpu(vid_hdr->hdr_crc));
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pr_err("Volume identifier header hexdump:\n");
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print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
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vid_hdr, UBI_VID_HDR_SIZE, 1);
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}
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/**
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* ubi_dump_vol_info - dump volume information.
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* @vol: UBI volume description object
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*/
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void ubi_dump_vol_info(const struct ubi_volume *vol)
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{
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pr_err("Volume information dump:\n");
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pr_err("\tvol_id %d\n", vol->vol_id);
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pr_err("\treserved_pebs %d\n", vol->reserved_pebs);
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pr_err("\talignment %d\n", vol->alignment);
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pr_err("\tdata_pad %d\n", vol->data_pad);
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pr_err("\tvol_type %d\n", vol->vol_type);
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pr_err("\tname_len %d\n", vol->name_len);
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pr_err("\tusable_leb_size %d\n", vol->usable_leb_size);
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pr_err("\tused_ebs %d\n", vol->used_ebs);
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pr_err("\tused_bytes %lld\n", vol->used_bytes);
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pr_err("\tlast_eb_bytes %d\n", vol->last_eb_bytes);
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pr_err("\tcorrupted %d\n", vol->corrupted);
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pr_err("\tupd_marker %d\n", vol->upd_marker);
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if (vol->name_len <= UBI_VOL_NAME_MAX &&
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strnlen(vol->name, vol->name_len + 1) == vol->name_len) {
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pr_err("\tname %s\n", vol->name);
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} else {
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pr_err("\t1st 5 characters of name: %c%c%c%c%c\n",
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vol->name[0], vol->name[1], vol->name[2],
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vol->name[3], vol->name[4]);
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}
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}
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/**
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* ubi_dump_vtbl_record - dump a &struct ubi_vtbl_record object.
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* @r: the object to dump
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* @idx: volume table index
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*/
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void ubi_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx)
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{
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int name_len = be16_to_cpu(r->name_len);
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pr_err("Volume table record %d dump:\n", idx);
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pr_err("\treserved_pebs %d\n", be32_to_cpu(r->reserved_pebs));
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pr_err("\talignment %d\n", be32_to_cpu(r->alignment));
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pr_err("\tdata_pad %d\n", be32_to_cpu(r->data_pad));
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pr_err("\tvol_type %d\n", (int)r->vol_type);
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pr_err("\tupd_marker %d\n", (int)r->upd_marker);
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pr_err("\tname_len %d\n", name_len);
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if (r->name[0] == '\0') {
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pr_err("\tname NULL\n");
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return;
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}
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if (name_len <= UBI_VOL_NAME_MAX &&
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strnlen(&r->name[0], name_len + 1) == name_len) {
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pr_err("\tname %s\n", &r->name[0]);
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} else {
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pr_err("\t1st 5 characters of name: %c%c%c%c%c\n",
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r->name[0], r->name[1], r->name[2], r->name[3],
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r->name[4]);
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}
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pr_err("\tcrc %#08x\n", be32_to_cpu(r->crc));
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}
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/**
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* ubi_dump_av - dump a &struct ubi_ainf_volume object.
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* @av: the object to dump
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*/
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void ubi_dump_av(const struct ubi_ainf_volume *av)
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{
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pr_err("Volume attaching information dump:\n");
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pr_err("\tvol_id %d\n", av->vol_id);
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pr_err("\thighest_lnum %d\n", av->highest_lnum);
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pr_err("\tleb_count %d\n", av->leb_count);
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pr_err("\tcompat %d\n", av->compat);
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pr_err("\tvol_type %d\n", av->vol_type);
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pr_err("\tused_ebs %d\n", av->used_ebs);
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pr_err("\tlast_data_size %d\n", av->last_data_size);
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pr_err("\tdata_pad %d\n", av->data_pad);
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}
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/**
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* ubi_dump_aeb - dump a &struct ubi_ainf_peb object.
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* @aeb: the object to dump
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* @type: object type: 0 - not corrupted, 1 - corrupted
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*/
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void ubi_dump_aeb(const struct ubi_ainf_peb *aeb, int type)
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{
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pr_err("eraseblock attaching information dump:\n");
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pr_err("\tec %d\n", aeb->ec);
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pr_err("\tpnum %d\n", aeb->pnum);
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if (type == 0) {
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pr_err("\tlnum %d\n", aeb->lnum);
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pr_err("\tscrub %d\n", aeb->scrub);
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pr_err("\tsqnum %llu\n", aeb->sqnum);
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}
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}
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/**
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* ubi_dump_mkvol_req - dump a &struct ubi_mkvol_req object.
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* @req: the object to dump
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*/
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void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req)
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{
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char nm[17];
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pr_err("Volume creation request dump:\n");
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pr_err("\tvol_id %d\n", req->vol_id);
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pr_err("\talignment %d\n", req->alignment);
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pr_err("\tbytes %lld\n", (long long)req->bytes);
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pr_err("\tvol_type %d\n", req->vol_type);
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pr_err("\tname_len %d\n", req->name_len);
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memcpy(nm, req->name, 16);
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nm[16] = 0;
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pr_err("\t1st 16 characters of name: %s\n", nm);
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}
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/*
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* Root directory for UBI stuff in debugfs. Contains sub-directories which
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* contain the stuff specific to particular UBI devices.
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*/
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static struct dentry *dfs_rootdir;
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/**
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* ubi_debugfs_init - create UBI debugfs directory.
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*
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* Create UBI debugfs directory. Returns zero 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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int ubi_debugfs_init(void)
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{
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if (!IS_ENABLED(CONFIG_DEBUG_FS))
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return 0;
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dfs_rootdir = debugfs_create_dir("ubi", NULL);
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if (IS_ERR_OR_NULL(dfs_rootdir)) {
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int err = dfs_rootdir ? PTR_ERR(dfs_rootdir) : -ENODEV;
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pr_err("UBI error: cannot create \"ubi\" debugfs directory, error %d\n",
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err);
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return err;
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}
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return 0;
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}
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/**
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* ubi_debugfs_exit - remove UBI debugfs directory.
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*/
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void ubi_debugfs_exit(void)
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{
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if (IS_ENABLED(CONFIG_DEBUG_FS))
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debugfs_remove(dfs_rootdir);
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}
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/* Read an UBI debugfs file */
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static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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unsigned long ubi_num = (unsigned long)file->private_data;
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struct dentry *dent = file->f_path.dentry;
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struct ubi_device *ubi;
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struct ubi_debug_info *d;
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char buf[8];
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int val;
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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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d = &ubi->dbg;
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if (dent == d->dfs_chk_gen)
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val = d->chk_gen;
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else if (dent == d->dfs_chk_io)
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val = d->chk_io;
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else if (dent == d->dfs_chk_fastmap)
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val = d->chk_fastmap;
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else if (dent == d->dfs_disable_bgt)
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val = d->disable_bgt;
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else if (dent == d->dfs_emulate_bitflips)
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val = d->emulate_bitflips;
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else if (dent == d->dfs_emulate_io_failures)
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val = d->emulate_io_failures;
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else if (dent == d->dfs_emulate_power_cut) {
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snprintf(buf, sizeof(buf), "%u\n", d->emulate_power_cut);
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count = simple_read_from_buffer(user_buf, count, ppos,
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buf, strlen(buf));
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goto out;
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} else if (dent == d->dfs_power_cut_min) {
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snprintf(buf, sizeof(buf), "%u\n", d->power_cut_min);
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count = simple_read_from_buffer(user_buf, count, ppos,
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buf, strlen(buf));
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goto out;
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} else if (dent == d->dfs_power_cut_max) {
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snprintf(buf, sizeof(buf), "%u\n", d->power_cut_max);
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count = simple_read_from_buffer(user_buf, count, ppos,
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buf, strlen(buf));
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goto out;
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}
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else {
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count = -EINVAL;
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goto out;
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}
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if (val)
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buf[0] = '1';
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else
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buf[0] = '0';
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buf[1] = '\n';
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buf[2] = 0x00;
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count = simple_read_from_buffer(user_buf, count, ppos, buf, 2);
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out:
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ubi_put_device(ubi);
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return count;
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}
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/* Write an UBI debugfs file */
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static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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unsigned long ubi_num = (unsigned long)file->private_data;
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struct dentry *dent = file->f_path.dentry;
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struct ubi_device *ubi;
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struct ubi_debug_info *d;
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size_t buf_size;
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char buf[8] = {0};
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int val;
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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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d = &ubi->dbg;
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buf_size = min_t(size_t, count, (sizeof(buf) - 1));
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if (copy_from_user(buf, user_buf, buf_size)) {
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count = -EFAULT;
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goto out;
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}
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if (dent == d->dfs_power_cut_min) {
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if (kstrtouint(buf, 0, &d->power_cut_min) != 0)
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count = -EINVAL;
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goto out;
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} else if (dent == d->dfs_power_cut_max) {
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if (kstrtouint(buf, 0, &d->power_cut_max) != 0)
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count = -EINVAL;
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goto out;
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} else if (dent == d->dfs_emulate_power_cut) {
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if (kstrtoint(buf, 0, &val) != 0)
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count = -EINVAL;
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else
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d->emulate_power_cut = val;
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goto out;
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}
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if (buf[0] == '1')
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val = 1;
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else if (buf[0] == '0')
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val = 0;
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else {
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count = -EINVAL;
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goto out;
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}
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if (dent == d->dfs_chk_gen)
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d->chk_gen = val;
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else if (dent == d->dfs_chk_io)
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d->chk_io = val;
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else if (dent == d->dfs_chk_fastmap)
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d->chk_fastmap = val;
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else if (dent == d->dfs_disable_bgt)
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d->disable_bgt = val;
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else if (dent == d->dfs_emulate_bitflips)
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d->emulate_bitflips = val;
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else if (dent == d->dfs_emulate_io_failures)
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d->emulate_io_failures = val;
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else
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count = -EINVAL;
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out:
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ubi_put_device(ubi);
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return count;
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}
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/* File operations for all UBI debugfs files except
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* detailed_erase_block_info
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*/
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static const struct file_operations dfs_fops = {
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.read = dfs_file_read,
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.write = dfs_file_write,
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.open = simple_open,
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.llseek = no_llseek,
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.owner = THIS_MODULE,
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};
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/* As long as the position is less then that total number of erase blocks,
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* we still have more to print.
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*/
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static void *eraseblk_count_seq_start(struct seq_file *s, loff_t *pos)
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{
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struct ubi_device *ubi = s->private;
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if (*pos == 0)
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return SEQ_START_TOKEN;
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if (*pos < ubi->peb_count)
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return pos;
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return NULL;
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}
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/* Since we are using the position as the iterator, we just need to check if we
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* are done and increment the position.
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*/
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static void *eraseblk_count_seq_next(struct seq_file *s, void *v, loff_t *pos)
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{
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struct ubi_device *ubi = s->private;
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if (v == SEQ_START_TOKEN)
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return pos;
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(*pos)++;
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if (*pos < ubi->peb_count)
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return pos;
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return NULL;
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}
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static void eraseblk_count_seq_stop(struct seq_file *s, void *v)
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{
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}
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static int eraseblk_count_seq_show(struct seq_file *s, void *iter)
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{
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struct ubi_device *ubi = s->private;
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struct ubi_wl_entry *wl;
|
|
int *block_number = iter;
|
|
int erase_count = -1;
|
|
int err;
|
|
|
|
/* If this is the start, print a header */
|
|
if (iter == SEQ_START_TOKEN) {
|
|
seq_puts(s,
|
|
"physical_block_number\terase_count\tblock_status\tread_status\n");
|
|
return 0;
|
|
}
|
|
|
|
err = ubi_io_is_bad(ubi, *block_number);
|
|
if (err)
|
|
return err;
|
|
|
|
spin_lock(&ubi->wl_lock);
|
|
|
|
wl = ubi->lookuptbl[*block_number];
|
|
if (wl)
|
|
erase_count = wl->ec;
|
|
|
|
spin_unlock(&ubi->wl_lock);
|
|
|
|
if (erase_count < 0)
|
|
return 0;
|
|
|
|
seq_printf(s, "%-22d\t%-11d\n", *block_number, erase_count);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations eraseblk_count_seq_ops = {
|
|
.start = eraseblk_count_seq_start,
|
|
.next = eraseblk_count_seq_next,
|
|
.stop = eraseblk_count_seq_stop,
|
|
.show = eraseblk_count_seq_show
|
|
};
|
|
|
|
static int eraseblk_count_open(struct inode *inode, struct file *f)
|
|
{
|
|
struct seq_file *s;
|
|
int err;
|
|
|
|
err = seq_open(f, &eraseblk_count_seq_ops);
|
|
if (err)
|
|
return err;
|
|
|
|
s = f->private_data;
|
|
s->private = ubi_get_device((unsigned long)inode->i_private);
|
|
|
|
if (!s->private)
|
|
return -ENODEV;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static int eraseblk_count_release(struct inode *inode, struct file *f)
|
|
{
|
|
struct seq_file *s = f->private_data;
|
|
struct ubi_device *ubi = s->private;
|
|
|
|
ubi_put_device(ubi);
|
|
|
|
return seq_release(inode, f);
|
|
}
|
|
|
|
static const struct file_operations eraseblk_count_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = eraseblk_count_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = eraseblk_count_release,
|
|
};
|
|
|
|
/**
|
|
* ubi_debugfs_init_dev - initialize debugfs for an UBI device.
|
|
* @ubi: UBI device description object
|
|
*
|
|
* This function creates all debugfs files for UBI device @ubi. Returns zero in
|
|
* case of success and a negative error code in case of failure.
|
|
*/
|
|
int ubi_debugfs_init_dev(struct ubi_device *ubi)
|
|
{
|
|
int err, n;
|
|
unsigned long ubi_num = ubi->ubi_num;
|
|
const char *fname;
|
|
struct dentry *dent;
|
|
struct ubi_debug_info *d = &ubi->dbg;
|
|
|
|
if (!IS_ENABLED(CONFIG_DEBUG_FS))
|
|
return 0;
|
|
|
|
n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME,
|
|
ubi->ubi_num);
|
|
if (n == UBI_DFS_DIR_LEN) {
|
|
/* The array size is too small */
|
|
fname = UBI_DFS_DIR_NAME;
|
|
dent = ERR_PTR(-EINVAL);
|
|
goto out;
|
|
}
|
|
|
|
fname = d->dfs_dir_name;
|
|
dent = debugfs_create_dir(fname, dfs_rootdir);
|
|
if (IS_ERR_OR_NULL(dent))
|
|
goto out;
|
|
d->dfs_dir = dent;
|
|
|
|
fname = "chk_gen";
|
|
dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
|
|
&dfs_fops);
|
|
if (IS_ERR_OR_NULL(dent))
|
|
goto out_remove;
|
|
d->dfs_chk_gen = dent;
|
|
|
|
fname = "chk_io";
|
|
dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
|
|
&dfs_fops);
|
|
if (IS_ERR_OR_NULL(dent))
|
|
goto out_remove;
|
|
d->dfs_chk_io = dent;
|
|
|
|
fname = "chk_fastmap";
|
|
dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
|
|
&dfs_fops);
|
|
if (IS_ERR_OR_NULL(dent))
|
|
goto out_remove;
|
|
d->dfs_chk_fastmap = dent;
|
|
|
|
fname = "tst_disable_bgt";
|
|
dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
|
|
&dfs_fops);
|
|
if (IS_ERR_OR_NULL(dent))
|
|
goto out_remove;
|
|
d->dfs_disable_bgt = dent;
|
|
|
|
fname = "tst_emulate_bitflips";
|
|
dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
|
|
&dfs_fops);
|
|
if (IS_ERR_OR_NULL(dent))
|
|
goto out_remove;
|
|
d->dfs_emulate_bitflips = dent;
|
|
|
|
fname = "tst_emulate_io_failures";
|
|
dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
|
|
&dfs_fops);
|
|
if (IS_ERR_OR_NULL(dent))
|
|
goto out_remove;
|
|
d->dfs_emulate_io_failures = dent;
|
|
|
|
fname = "tst_emulate_power_cut";
|
|
dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
|
|
&dfs_fops);
|
|
if (IS_ERR_OR_NULL(dent))
|
|
goto out_remove;
|
|
d->dfs_emulate_power_cut = dent;
|
|
|
|
fname = "tst_emulate_power_cut_min";
|
|
dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
|
|
&dfs_fops);
|
|
if (IS_ERR_OR_NULL(dent))
|
|
goto out_remove;
|
|
d->dfs_power_cut_min = dent;
|
|
|
|
fname = "tst_emulate_power_cut_max";
|
|
dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
|
|
&dfs_fops);
|
|
if (IS_ERR_OR_NULL(dent))
|
|
goto out_remove;
|
|
d->dfs_power_cut_max = dent;
|
|
|
|
fname = "detailed_erase_block_info";
|
|
dent = debugfs_create_file(fname, S_IRUSR, d->dfs_dir, (void *)ubi_num,
|
|
&eraseblk_count_fops);
|
|
if (IS_ERR_OR_NULL(dent))
|
|
goto out_remove;
|
|
|
|
return 0;
|
|
|
|
out_remove:
|
|
debugfs_remove_recursive(d->dfs_dir);
|
|
out:
|
|
err = dent ? PTR_ERR(dent) : -ENODEV;
|
|
ubi_err(ubi, "cannot create \"%s\" debugfs file or directory, error %d\n",
|
|
fname, err);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* dbg_debug_exit_dev - free all debugfs files corresponding to device @ubi
|
|
* @ubi: UBI device description object
|
|
*/
|
|
void ubi_debugfs_exit_dev(struct ubi_device *ubi)
|
|
{
|
|
if (IS_ENABLED(CONFIG_DEBUG_FS))
|
|
debugfs_remove_recursive(ubi->dbg.dfs_dir);
|
|
}
|
|
|
|
/**
|
|
* ubi_dbg_power_cut - emulate a power cut if it is time to do so
|
|
* @ubi: UBI device description object
|
|
* @caller: Flags set to indicate from where the function is being called
|
|
*
|
|
* Returns non-zero if a power cut was emulated, zero if not.
|
|
*/
|
|
int ubi_dbg_power_cut(struct ubi_device *ubi, int caller)
|
|
{
|
|
unsigned int range;
|
|
|
|
if ((ubi->dbg.emulate_power_cut & caller) == 0)
|
|
return 0;
|
|
|
|
if (ubi->dbg.power_cut_counter == 0) {
|
|
ubi->dbg.power_cut_counter = ubi->dbg.power_cut_min;
|
|
|
|
if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) {
|
|
range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min;
|
|
ubi->dbg.power_cut_counter += prandom_u32() % range;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
ubi->dbg.power_cut_counter--;
|
|
if (ubi->dbg.power_cut_counter)
|
|
return 0;
|
|
|
|
ubi_msg(ubi, "XXXXXXXXXXXXXXX emulating a power cut XXXXXXXXXXXXXXXX");
|
|
ubi_ro_mode(ubi);
|
|
return 1;
|
|
}
|