This patch cleans up a bit the code by moving the autorepair part into a separate function. Signed off: piergiorgio.sartor@nexgo.de Signed-off-by: NeilBrown <neilb@suse.de>
638 lines
17 KiB
C
638 lines
17 KiB
C
/*
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* raid6check - extended consistency check for RAID-6
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*
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* Copyright (C) 2011 Piergiorgio Sartor
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*
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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 the
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* 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: Piergiorgio Sartor
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* Based on "restripe.c" from "mdadm" codebase
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*/
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#include "mdadm.h"
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#include <stdint.h>
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#include <signal.h>
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#include <sys/mman.h>
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#define CHECK_PAGE_BITS (12)
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#define CHECK_PAGE_SIZE (1 << CHECK_PAGE_BITS)
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enum repair {
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NO_REPAIR = 0,
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MANUAL_REPAIR,
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AUTO_REPAIR
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};
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int geo_map(int block, unsigned long long stripe, int raid_disks,
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int level, int layout);
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void qsyndrome(uint8_t *p, uint8_t *q, uint8_t **sources, int disks, int size);
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void make_tables(void);
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void ensure_zero_has_size(int chunk_size);
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void raid6_datap_recov(int disks, size_t bytes, int faila, uint8_t **ptrs);
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void raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
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uint8_t **ptrs);
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void xor_blocks(char *target, char **sources, int disks, int size);
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/* Collect per stripe consistency information */
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void raid6_collect(int chunk_size, uint8_t *p, uint8_t *q,
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char *chunkP, char *chunkQ, int *results)
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{
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int i;
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int data_id;
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uint8_t Px, Qx;
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extern uint8_t raid6_gflog[];
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for(i = 0; i < chunk_size; i++) {
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Px = (uint8_t)chunkP[i] ^ (uint8_t)p[i];
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Qx = (uint8_t)chunkQ[i] ^ (uint8_t)q[i];
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if((Px != 0) && (Qx == 0))
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results[i] = -1;
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if((Px == 0) && (Qx != 0))
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results[i] = -2;
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if((Px != 0) && (Qx != 0)) {
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data_id = (raid6_gflog[Qx] - raid6_gflog[Px]);
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if(data_id < 0) data_id += 255;
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results[i] = data_id;
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}
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if((Px == 0) && (Qx == 0))
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results[i] = -255;
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}
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}
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/* Try to find out if a specific disk has problems in a CHECK_PAGE_SIZE page size */
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int raid6_stats_blk(int *results, int raid_disks)
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{
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int i;
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int curr_broken_disk = -255;
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int prev_broken_disk = -255;
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int broken_status = 0;
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for(i = 0; i < CHECK_PAGE_SIZE; i++) {
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if(results[i] != -255)
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curr_broken_disk = results[i];
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if(curr_broken_disk >= raid_disks)
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broken_status = 2;
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switch(broken_status) {
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case 0:
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if(curr_broken_disk != -255) {
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prev_broken_disk = curr_broken_disk;
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broken_status = 1;
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}
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break;
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case 1:
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if(curr_broken_disk != prev_broken_disk)
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broken_status = 2;
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break;
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case 2:
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default:
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curr_broken_disk = prev_broken_disk = -65535;
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break;
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}
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}
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return curr_broken_disk;
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}
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/* Collect disks status for a strip in CHECK_PAGE_SIZE page size blocks */
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void raid6_stats(int *disk, int *results, int raid_disks, int chunk_size)
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{
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int i, j;
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for(i = 0, j = 0; i < chunk_size; i += CHECK_PAGE_SIZE, j++) {
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disk[j] = raid6_stats_blk(&results[i], raid_disks);
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}
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}
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int lock_stripe(struct mdinfo *info, unsigned long long start,
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int chunk_size, int data_disks, sighandler_t *sig) {
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int rv;
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if(mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
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return 2;
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}
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sig[0] = signal(SIGTERM, SIG_IGN);
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sig[1] = signal(SIGINT, SIG_IGN);
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sig[2] = signal(SIGQUIT, SIG_IGN);
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rv = sysfs_set_num(info, NULL, "suspend_lo", start * chunk_size * data_disks);
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rv |= sysfs_set_num(info, NULL, "suspend_hi", (start + 1) * chunk_size * data_disks);
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return rv * 256;
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}
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int unlock_all_stripes(struct mdinfo *info, sighandler_t *sig) {
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int rv;
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rv = sysfs_set_num(info, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
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rv |= sysfs_set_num(info, NULL, "suspend_hi", 0);
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rv |= sysfs_set_num(info, NULL, "suspend_lo", 0);
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signal(SIGQUIT, sig[2]);
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signal(SIGINT, sig[1]);
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signal(SIGTERM, sig[0]);
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if(munlockall() != 0)
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return 3;
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return rv * 256;
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}
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/* Autorepair */
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int autorepair(int *disk, int diskP, int diskQ, unsigned long long start, int chunk_size,
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char *name[], int raid_disks, int data_disks, char **blocks_page,
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char **blocks, uint8_t *p, char **stripes, int *block_index_for_slot,
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int *source, unsigned long long *offsets)
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{
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int i, j;
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int pages_to_write_count = 0;
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int page_to_write[chunk_size >> CHECK_PAGE_BITS];
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for(j = 0; j < (chunk_size >> CHECK_PAGE_BITS); j++) {
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if (disk[j] >= 0) {
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printf("Auto-repairing slot %d (%s)\n", disk[j], name[disk[j]]);
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pages_to_write_count++;
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page_to_write[j] = 1;
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for(i = 0; i < raid_disks; i++) {
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blocks_page[i] = blocks[i] + j * CHECK_PAGE_SIZE;
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}
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if (disk[j] == diskQ) {
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qsyndrome(p, (uint8_t*)stripes[diskQ] + j * CHECK_PAGE_SIZE, (uint8_t**)blocks_page, data_disks, CHECK_PAGE_SIZE);
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}
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else {
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char *all_but_failed_blocks[data_disks];
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int failed_block_index = block_index_for_slot[disk[j]];
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for(i = 0; i < data_disks; i++) {
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if (failed_block_index == i) {
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all_but_failed_blocks[i] = stripes[diskP] + j * CHECK_PAGE_SIZE;
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}
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else {
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all_but_failed_blocks[i] = blocks_page[i];
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}
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}
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xor_blocks(stripes[disk[j]] + j * CHECK_PAGE_SIZE,
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all_but_failed_blocks, data_disks, CHECK_PAGE_SIZE);
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}
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}
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else {
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page_to_write[j] = 0;
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}
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}
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if(pages_to_write_count > 0) {
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int write_res = 0;
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for(j = 0; j < (chunk_size >> CHECK_PAGE_BITS); j++) {
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if(page_to_write[j] == 1) {
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lseek64(source[disk[j]], offsets[disk[j]] + start * chunk_size + j * CHECK_PAGE_SIZE, SEEK_SET);
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write_res += write(source[disk[j]], stripes[disk[j]] + j * CHECK_PAGE_SIZE, CHECK_PAGE_SIZE);
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}
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}
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if (write_res != (CHECK_PAGE_SIZE * pages_to_write_count)) {
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fprintf(stderr, "Failed to write a full chunk.\n");
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return -1;
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}
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}
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return 0;
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}
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int check_stripes(struct mdinfo *info, int *source, unsigned long long *offsets,
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int raid_disks, int chunk_size, int level, int layout,
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unsigned long long start, unsigned long long length, char *name[],
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enum repair repair, int failed_disk1, int failed_disk2)
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{
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/* read the data and p and q blocks, and check we got them right */
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char *stripe_buf = xmalloc(raid_disks * chunk_size);
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char **stripes = xmalloc(raid_disks * sizeof(char*));
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char **blocks = xmalloc(raid_disks * sizeof(char*));
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char **blocks_page = xmalloc(raid_disks * sizeof(char*));
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int *block_index_for_slot = xmalloc(raid_disks * sizeof(int));
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uint8_t *p = xmalloc(chunk_size);
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uint8_t *q = xmalloc(chunk_size);
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int *results = xmalloc(chunk_size * sizeof(int));
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sighandler_t *sig = xmalloc(3 * sizeof(sighandler_t));
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int i, j;
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int diskP, diskQ;
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int data_disks = raid_disks - 2;
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int err = 0;
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extern int tables_ready;
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if (!tables_ready)
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make_tables();
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for ( i = 0 ; i < raid_disks ; i++)
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stripes[i] = stripe_buf + i * chunk_size;
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while (length > 0) {
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int disk[chunk_size >> CHECK_PAGE_BITS];
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err = lock_stripe(info, start, chunk_size, data_disks, sig);
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if(err != 0) {
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if (err != 2)
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unlock_all_stripes(info, sig);
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goto exitCheck;
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}
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for (i = 0 ; i < raid_disks ; i++) {
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off64_t seek_res = lseek64(source[i], offsets[i] + start * chunk_size,
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SEEK_SET);
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if (seek_res < 0) {
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fprintf(stderr, "lseek to source %d failed\n", i);
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unlock_all_stripes(info, sig);
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err = -1;
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goto exitCheck;
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}
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int read_res = read(source[i], stripes[i], chunk_size);
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if (read_res < chunk_size) {
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fprintf(stderr, "Failed to read complete chunk disk %d, aborting\n", i);
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unlock_all_stripes(info, sig);
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err = -1;
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goto exitCheck;
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}
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}
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for (i = 0 ; i < data_disks ; i++) {
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int disk = geo_map(i, start, raid_disks, level, layout);
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blocks[i] = stripes[disk];
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block_index_for_slot[disk] = i;
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}
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qsyndrome(p, q, (uint8_t**)blocks, data_disks, chunk_size);
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diskP = geo_map(-1, start, raid_disks, level, layout);
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diskQ = geo_map(-2, start, raid_disks, level, layout);
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blocks[data_disks] = stripes[diskP];
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block_index_for_slot[diskP] = data_disks;
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blocks[data_disks+1] = stripes[diskQ];
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block_index_for_slot[diskQ] = data_disks+1;
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raid6_collect(chunk_size, p, q, stripes[diskP], stripes[diskQ], results);
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raid6_stats(disk, results, raid_disks, chunk_size);
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for(j = 0; j < (chunk_size >> CHECK_PAGE_BITS); j++) {
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if(disk[j] >= -2) {
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disk[j] = geo_map(disk[j], start, raid_disks, level, layout);
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}
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if(disk[j] >= 0) {
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printf("Error detected at stripe %llu, page %d: possible failed disk slot: %d --> %s\n",
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start, j, disk[j], name[disk[j]]);
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}
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if(disk[j] == -65535) {
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printf("Error detected at stripe %llu, page %d: disk slot unknown\n", start, j);
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}
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}
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if(repair == AUTO_REPAIR) {
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err = autorepair(disk, diskP, diskQ, start, chunk_size,
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name, raid_disks, data_disks, blocks_page,
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blocks, p, stripes, block_index_for_slot,
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source, offsets);
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if(err != 0) {
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unlock_all_stripes(info, sig);
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goto exitCheck;
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}
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}
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err = unlock_all_stripes(info, sig);
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if(err != 0) {
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goto exitCheck;
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}
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if(repair == MANUAL_REPAIR) {
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printf("Repairing stripe %llu\n", start);
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printf("Assuming slots %d (%s) and %d (%s) are incorrect\n",
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failed_disk1, name[failed_disk1],
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failed_disk2, name[failed_disk2]);
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if (failed_disk1 == diskQ || failed_disk2 == diskQ) {
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char *all_but_failed_blocks[data_disks];
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int failed_data_or_p;
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int failed_block_index;
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if (failed_disk1 == diskQ)
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failed_data_or_p = failed_disk2;
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else
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failed_data_or_p = failed_disk1;
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printf("Repairing D/P(%d) and Q\n", failed_data_or_p);
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failed_block_index = block_index_for_slot[failed_data_or_p];
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for (i=0; i < data_disks; i++)
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if (failed_block_index == i)
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all_but_failed_blocks[i] = stripes[diskP];
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else
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all_but_failed_blocks[i] = blocks[i];
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xor_blocks(stripes[failed_data_or_p],
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all_but_failed_blocks, data_disks, chunk_size);
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qsyndrome(p, (uint8_t*)stripes[diskQ], (uint8_t**)blocks, data_disks, chunk_size);
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} else {
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ensure_zero_has_size(chunk_size);
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if (failed_disk1 == diskP || failed_disk2 == diskP) {
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int failed_data, failed_block_index;
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if (failed_disk1 == diskP)
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failed_data = failed_disk2;
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else
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failed_data = failed_disk1;
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failed_block_index = block_index_for_slot[failed_data];
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printf("Repairing D(%d) and P\n", failed_data);
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raid6_datap_recov(raid_disks, chunk_size, failed_block_index, (uint8_t**)blocks);
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} else {
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printf("Repairing D and D\n");
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int failed_block_index1 = block_index_for_slot[failed_disk1];
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int failed_block_index2 = block_index_for_slot[failed_disk2];
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if (failed_block_index1 > failed_block_index2) {
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int t = failed_block_index1;
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failed_block_index1 = failed_block_index2;
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failed_block_index2 = t;
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}
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raid6_2data_recov(raid_disks, chunk_size, failed_block_index1, failed_block_index2, (uint8_t**)blocks);
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}
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}
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err = lock_stripe(info, start, chunk_size, data_disks, sig);
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if(err != 0) {
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if (err != 2)
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unlock_all_stripes(info, sig);
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goto exitCheck;
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}
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int write_res1, write_res2;
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off64_t seek_res;
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seek_res = lseek64(source[failed_disk1],
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offsets[failed_disk1] + start * chunk_size, SEEK_SET);
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if (seek_res < 0) {
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fprintf(stderr, "lseek failed for failed_disk1\n");
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unlock_all_stripes(info, sig);
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err = -1;
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goto exitCheck;
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}
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write_res1 = write(source[failed_disk1], stripes[failed_disk1], chunk_size);
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seek_res = lseek64(source[failed_disk2],
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offsets[failed_disk2] + start * chunk_size, SEEK_SET);
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if (seek_res < 0) {
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fprintf(stderr, "lseek failed for failed_disk1\n");
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unlock_all_stripes(info, sig);
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err = -1;
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goto exitCheck;
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}
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write_res2 = write(source[failed_disk2], stripes[failed_disk2], chunk_size);
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err = unlock_all_stripes(info, sig);
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if(err != 0)
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goto exitCheck;
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if (write_res1 != chunk_size || write_res2 != chunk_size) {
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fprintf(stderr, "Failed to write a complete chunk.\n");
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goto exitCheck;
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}
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}
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length--;
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start++;
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}
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exitCheck:
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free(stripe_buf);
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free(stripes);
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free(blocks);
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free(blocks_page);
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free(block_index_for_slot);
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free(p);
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free(q);
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free(results);
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free(sig);
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return err;
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}
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unsigned long long getnum(char *str, char **err)
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{
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char *e;
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unsigned long long rv = strtoull(str, &e, 10);
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if (e==str || *e) {
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*err = str;
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return 0;
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}
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return rv;
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}
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int main(int argc, char *argv[])
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{
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/* md_device start length */
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int *fds = NULL;
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char *buf = NULL;
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char **disk_name = NULL;
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unsigned long long *offsets = NULL;
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int raid_disks = 0;
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int active_disks;
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int chunk_size = 0;
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int layout = -1;
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int level = 6;
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enum repair repair = NO_REPAIR;
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int failed_disk1 = -1;
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int failed_disk2 = -1;
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unsigned long long start, length;
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int i;
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int mdfd;
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struct mdinfo *info = NULL, *comp = NULL;
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char *err = NULL;
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int exit_err = 0;
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int close_flag = 0;
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char *prg = strrchr(argv[0], '/');
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if (prg == NULL)
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prg = argv[0];
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else
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prg++;
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if (argc < 4) {
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fprintf(stderr, "Usage: %s md_device start_stripe length_stripes [autorepair]\n", prg);
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fprintf(stderr, " or: %s md_device repair stripe failed_slot_1 failed_slot_2\n", prg);
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exit_err = 1;
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goto exitHere;
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}
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|
|
mdfd = open(argv[1], O_RDONLY);
|
|
if(mdfd < 0) {
|
|
perror(argv[1]);
|
|
fprintf(stderr, "%s: cannot open %s\n", prg, argv[1]);
|
|
exit_err = 2;
|
|
goto exitHere;
|
|
}
|
|
|
|
info = sysfs_read(mdfd, NULL,
|
|
GET_LEVEL|
|
|
GET_LAYOUT|
|
|
GET_DISKS|
|
|
GET_DEGRADED |
|
|
GET_COMPONENT|
|
|
GET_CHUNK|
|
|
GET_DEVS|
|
|
GET_OFFSET|
|
|
GET_SIZE);
|
|
|
|
if(info == NULL) {
|
|
fprintf(stderr, "%s: Error reading sysfs information of %s\n", prg, argv[1]);
|
|
exit_err = 9;
|
|
goto exitHere;
|
|
}
|
|
|
|
if(info->array.level != level) {
|
|
fprintf(stderr, "%s: %s not a RAID-6\n", prg, argv[1]);
|
|
exit_err = 3;
|
|
goto exitHere;
|
|
}
|
|
|
|
if(info->array.failed_disks > 0) {
|
|
fprintf(stderr, "%s: %s degraded array\n", prg, argv[1]);
|
|
exit_err = 8;
|
|
goto exitHere;
|
|
}
|
|
|
|
printf("layout: %d\n", info->array.layout);
|
|
printf("disks: %d\n", info->array.raid_disks);
|
|
printf("component size: %llu\n", info->component_size * 512);
|
|
printf("total stripes: %llu\n", (info->component_size * 512) / info->array.chunk_size);
|
|
printf("chunk size: %d\n", info->array.chunk_size);
|
|
printf("\n");
|
|
|
|
comp = info->devs;
|
|
for(i = 0, active_disks = 0; active_disks < info->array.raid_disks; i++) {
|
|
printf("disk: %d - offset: %llu - size: %llu - name: %s - slot: %d\n",
|
|
i, comp->data_offset * 512, comp->component_size * 512,
|
|
map_dev(comp->disk.major, comp->disk.minor, 0),
|
|
comp->disk.raid_disk);
|
|
if(comp->disk.raid_disk >= 0)
|
|
active_disks++;
|
|
comp = comp->next;
|
|
}
|
|
printf("\n");
|
|
|
|
close(mdfd);
|
|
|
|
raid_disks = info->array.raid_disks;
|
|
chunk_size = info->array.chunk_size;
|
|
layout = info->array.layout;
|
|
if (strcmp(argv[2], "repair")==0) {
|
|
if (argc < 6) {
|
|
fprintf(stderr, "For repair mode, call %s md_device repair stripe failed_slot_1 failed_slot_2\n", prg);
|
|
exit_err = 1;
|
|
goto exitHere;
|
|
}
|
|
repair = MANUAL_REPAIR;
|
|
start = getnum(argv[3], &err);
|
|
length = 1;
|
|
failed_disk1 = getnum(argv[4], &err);
|
|
failed_disk2 = getnum(argv[5], &err);
|
|
|
|
if(failed_disk1 >= info->array.raid_disks) {
|
|
fprintf(stderr, "%s: failed_slot_1 index is higher than number of devices in raid\n", prg);
|
|
exit_err = 4;
|
|
goto exitHere;
|
|
}
|
|
if(failed_disk2 >= info->array.raid_disks) {
|
|
fprintf(stderr, "%s: failed_slot_2 index is higher than number of devices in raid\n", prg);
|
|
exit_err = 4;
|
|
goto exitHere;
|
|
}
|
|
if(failed_disk1 == failed_disk2) {
|
|
fprintf(stderr, "%s: failed_slot_1 and failed_slot_2 are the same\n", prg);
|
|
exit_err = 4;
|
|
goto exitHere;
|
|
}
|
|
}
|
|
else {
|
|
start = getnum(argv[2], &err);
|
|
length = getnum(argv[3], &err);
|
|
if (argc >= 5 && strcmp(argv[4], "autorepair")==0)
|
|
repair = AUTO_REPAIR;
|
|
}
|
|
|
|
if (err) {
|
|
fprintf(stderr, "%s: Bad number: %s\n", prg, err);
|
|
exit_err = 4;
|
|
goto exitHere;
|
|
}
|
|
|
|
if(start > ((info->component_size * 512) / chunk_size)) {
|
|
start = (info->component_size * 512) / chunk_size;
|
|
fprintf(stderr, "%s: start beyond disks size\n", prg);
|
|
}
|
|
|
|
if((length == 0) ||
|
|
((length + start) > ((info->component_size * 512) / chunk_size))) {
|
|
length = (info->component_size * 512) / chunk_size - start;
|
|
}
|
|
|
|
disk_name = xmalloc(raid_disks * sizeof(*disk_name));
|
|
fds = xmalloc(raid_disks * sizeof(*fds));
|
|
offsets = xcalloc(raid_disks, sizeof(*offsets));
|
|
buf = xmalloc(raid_disks * chunk_size);
|
|
|
|
for(i=0; i<raid_disks; i++) {
|
|
fds[i] = -1;
|
|
}
|
|
close_flag = 1;
|
|
|
|
comp = info->devs;
|
|
for (i=0, active_disks=0; active_disks<raid_disks; i++) {
|
|
int disk_slot = comp->disk.raid_disk;
|
|
if(disk_slot >= 0) {
|
|
disk_name[disk_slot] = map_dev(comp->disk.major, comp->disk.minor, 0);
|
|
offsets[disk_slot] = comp->data_offset * 512;
|
|
fds[disk_slot] = open(disk_name[disk_slot], O_RDWR | O_SYNC);
|
|
if (fds[disk_slot] < 0) {
|
|
perror(disk_name[disk_slot]);
|
|
fprintf(stderr,"%s: cannot open %s\n", prg, disk_name[disk_slot]);
|
|
exit_err = 6;
|
|
goto exitHere;
|
|
}
|
|
active_disks++;
|
|
}
|
|
comp = comp->next;
|
|
}
|
|
|
|
int rv = check_stripes(info, fds, offsets,
|
|
raid_disks, chunk_size, level, layout,
|
|
start, length, disk_name, repair, failed_disk1, failed_disk2);
|
|
if (rv != 0) {
|
|
fprintf(stderr,
|
|
"%s: check_stripes returned %d\n", prg, rv);
|
|
exit_err = 7;
|
|
goto exitHere;
|
|
}
|
|
|
|
exitHere:
|
|
|
|
if (close_flag)
|
|
for(i = 0; i < raid_disks; i++)
|
|
close(fds[i]);
|
|
|
|
free(disk_name);
|
|
free(fds);
|
|
free(offsets);
|
|
free(buf);
|
|
|
|
exit(exit_err);
|
|
}
|