[thirdparty/mdadm.git] / raid6check.c

/*
 * raid6check - extended consistency check for RAID-6
 *
 * Copyright (C) 2011 Piergiorgio Sartor
 *
 *
 *    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *    Author: Piergiorgio Sartor
 *    Based on "restripe.c" from "mdadm" codebase
 */

#include "mdadm.h"
#include <stdint.h>
#include <signal.h>
#include <sys/mman.h>

#define CHECK_PAGE_BITS (12)
#define CHECK_PAGE_SIZE (1 << CHECK_PAGE_BITS)

enum repair {
	NO_REPAIR = 0,
	MANUAL_REPAIR,
	AUTO_REPAIR
};

int geo_map(int block, unsigned long long stripe, int raid_disks,
	    int level, int layout);
void qsyndrome(uint8_t *p, uint8_t *q, uint8_t **sources, int disks, int size);
void make_tables(void);
void ensure_zero_has_size(int chunk_size);
void raid6_datap_recov(int disks, size_t bytes, int faila, uint8_t **ptrs);
void raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
		       uint8_t **ptrs);
void xor_blocks(char *target, char **sources, int disks, int size);

/* Collect per stripe consistency information */
void raid6_collect(int chunk_size, uint8_t *p, uint8_t *q,
		   char *chunkP, char *chunkQ, int *results)
{
	int i;
	int data_id;
	uint8_t Px, Qx;
	extern uint8_t raid6_gflog[];

	for(i = 0; i < chunk_size; i++) {
		Px = (uint8_t)chunkP[i] ^ (uint8_t)p[i];
		Qx = (uint8_t)chunkQ[i] ^ (uint8_t)q[i];

		if((Px != 0) && (Qx == 0))
			results[i] = -1;

		if((Px == 0) && (Qx != 0))
			results[i] = -2;

		if((Px != 0) && (Qx != 0)) {
			data_id = (raid6_gflog[Qx] - raid6_gflog[Px]);
			if(data_id < 0) data_id += 255;
			results[i] = data_id;
		}

		if((Px == 0) && (Qx == 0))
			results[i] = -255;
	}
}

/* Try to find out if a specific disk has problems in a CHECK_PAGE_SIZE page size */
int raid6_stats_blk(int *results, int raid_disks)
{
	int i;
	int curr_broken_disk = -255;
	int prev_broken_disk = -255;
	int broken_status = 0;

	for(i = 0; i < CHECK_PAGE_SIZE; i++) {

		if(results[i] != -255)
			curr_broken_disk = results[i];

		if(curr_broken_disk >= raid_disks)
			broken_status = 2;

		switch(broken_status) {
		case 0:
			if(curr_broken_disk != -255) {
				prev_broken_disk = curr_broken_disk;
				broken_status = 1;
			}
			break;

		case 1:
			if(curr_broken_disk != prev_broken_disk)
				broken_status = 2;
			break;

		case 2:
		default:
			curr_broken_disk = prev_broken_disk = -65535;
			break;
		}
	}

	return curr_broken_disk;
}

/* Collect disks status for a strip in CHECK_PAGE_SIZE page size blocks */
void raid6_stats(int *disk, int *results, int raid_disks, int chunk_size)
{
	int i, j;

	for(i = 0, j = 0; i < chunk_size; i += CHECK_PAGE_SIZE, j++) {
		disk[j] = raid6_stats_blk(&results[i], raid_disks);
	}
}

int lock_stripe(struct mdinfo *info, unsigned long long start,
		int chunk_size, int data_disks, sighandler_t *sig) {
	int rv;
	if(mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
		return 2;
	}

	sig[0] = signal(SIGTERM, SIG_IGN);
	sig[1] = signal(SIGINT, SIG_IGN);
	sig[2] = signal(SIGQUIT, SIG_IGN);

	rv = sysfs_set_num(info, NULL, "suspend_lo", start * chunk_size * data_disks);
	rv |= sysfs_set_num(info, NULL, "suspend_hi", (start + 1) * chunk_size * data_disks);
	return rv * 256;
}

int unlock_all_stripes(struct mdinfo *info, sighandler_t *sig) {
	int rv;
	rv = sysfs_set_num(info, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
	rv |= sysfs_set_num(info, NULL, "suspend_hi", 0);
	rv |= sysfs_set_num(info, NULL, "suspend_lo", 0);

	signal(SIGQUIT, sig[2]);
	signal(SIGINT, sig[1]);
	signal(SIGTERM, sig[0]);

	if(munlockall() != 0)
		return 3;
	return rv * 256;
}

int check_stripes(struct mdinfo *info, int *source, unsigned long long *offsets,
		  int raid_disks, int chunk_size, int level, int layout,
		  unsigned long long start, unsigned long long length, char *name[],
		  enum repair repair, int failed_disk1, int failed_disk2)
{
	/* read the data and p and q blocks, and check we got them right */
	char *stripe_buf = xmalloc(raid_disks * chunk_size);
	char **stripes = xmalloc(raid_disks * sizeof(char*));
	char **blocks = xmalloc(raid_disks * sizeof(char*));
	char **blocks_page = xmalloc(raid_disks * sizeof(char*));
	int *block_index_for_slot = xmalloc(raid_disks * sizeof(int));
	uint8_t *p = xmalloc(chunk_size);
	uint8_t *q = xmalloc(chunk_size);
	int *results = xmalloc(chunk_size * sizeof(int));
	sighandler_t *sig = xmalloc(3 * sizeof(sighandler_t));

	int i, j;
	int diskP, diskQ;
	int data_disks = raid_disks - 2;
	int err = 0;

	extern int tables_ready;

	if (!tables_ready)
		make_tables();

	for ( i = 0 ; i < raid_disks ; i++)
		stripes[i] = stripe_buf + i * chunk_size;

	while (length > 0) {
		int disk[chunk_size >> CHECK_PAGE_BITS];

		err = lock_stripe(info, start, chunk_size, data_disks, sig);
		if(err != 0) {
			if (err != 2)
				unlock_all_stripes(info, sig);
			goto exitCheck;
		}
		for (i = 0 ; i < raid_disks ; i++) {
			off64_t seek_res = lseek64(source[i], offsets[i] + start * chunk_size,
						   SEEK_SET);
			if (seek_res < 0) {
				fprintf(stderr, "lseek to source %d failed\n", i);
				unlock_all_stripes(info, sig);
				err = -1;
				goto exitCheck;
			}
			int read_res = read(source[i], stripes[i], chunk_size);
			if (read_res < chunk_size) {
				fprintf(stderr, "Failed to read complete chunk disk %d, aborting\n", i);
				unlock_all_stripes(info, sig);
				err = -1;
				goto exitCheck;
			}
		}
		err = unlock_all_stripes(info, sig);
		if(err != 0)
			goto exitCheck;

		for (i = 0 ; i < data_disks ; i++) {
			int disk = geo_map(i, start, raid_disks, level, layout);
			blocks[i] = stripes[disk];
			block_index_for_slot[disk] = i;
		}

		qsyndrome(p, q, (uint8_t**)blocks, data_disks, chunk_size);
		diskP = geo_map(-1, start, raid_disks, level, layout);
		diskQ = geo_map(-2, start, raid_disks, level, layout);
		blocks[data_disks] = stripes[diskP];
		block_index_for_slot[diskP] = data_disks;
		blocks[data_disks+1] = stripes[diskQ];
		block_index_for_slot[diskQ] = data_disks+1;
/* Do we really need the code below? */
#if 0
		if (memcmp(p, stripes[diskP], chunk_size) != 0) {
			printf("P(%d) wrong at %llu\n", diskP, start);
		}
		if (memcmp(q, stripes[diskQ], chunk_size) != 0) {
			printf("Q(%d) wrong at %llu\n", diskQ, start);
		}
#endif
		raid6_collect(chunk_size, p, q, stripes[diskP], stripes[diskQ], results);
		raid6_stats(disk, results, raid_disks, chunk_size);

		for(j = 0; j < (chunk_size >> CHECK_PAGE_BITS); j++) {
			if(disk[j] >= -2) {
				disk[j] = geo_map(disk[j], start, raid_disks, level, layout);
			}
			if(disk[j] >= 0) {
				printf("Error detected at %llu, page %d: possible failed disk slot: %d --> %s\n",
					start, j, disk[j], name[disk[j]]);
			}
			if(disk[j] == -65535) {
				printf("Error detected at %llu, page %d: disk slot unknown\n", start, j);
			}
		}

		if(repair == MANUAL_REPAIR) {
			printf("Repairing stripe %llu\n", start);
			printf("Assuming slots %d (%s) and %d (%s) are incorrect\n",
			       failed_disk1, name[failed_disk1],
			       failed_disk2, name[failed_disk2]);

			if (failed_disk1 == diskQ || failed_disk2 == diskQ) {
				char *all_but_failed_blocks[data_disks];
				int failed_data_or_p;
				int failed_block_index;

				if (failed_disk1 == diskQ)
					failed_data_or_p = failed_disk2;
				else
					failed_data_or_p = failed_disk1;
				printf("Repairing D/P(%d) and Q\n", failed_data_or_p);
				failed_block_index = block_index_for_slot[failed_data_or_p];
				for (i=0; i < data_disks; i++)
					if (failed_block_index == i)
						all_but_failed_blocks[i] = stripes[diskP];
					else
						all_but_failed_blocks[i] = blocks[i];
				xor_blocks(stripes[failed_data_or_p],
					all_but_failed_blocks, data_disks, chunk_size);
				qsyndrome(p, (uint8_t*)stripes[diskQ], (uint8_t**)blocks, data_disks, chunk_size);
			} else {
				ensure_zero_has_size(chunk_size);
				if (failed_disk1 == diskP || failed_disk2 == diskP) {
					int failed_data, failed_block_index;
					if (failed_disk1 == diskP)
						failed_data = failed_disk2;
					else
						failed_data = failed_disk1;
					failed_block_index = block_index_for_slot[failed_data];
					printf("Repairing D(%d) and P\n", failed_data);
					raid6_datap_recov(raid_disks, chunk_size, failed_block_index, (uint8_t**)blocks);
				} else {
					printf("Repairing D and D\n");
					int failed_block_index1 = block_index_for_slot[failed_disk1];
					int failed_block_index2 = block_index_for_slot[failed_disk2];
					if (failed_block_index1 > failed_block_index2) {
						int t = failed_block_index1;
						failed_block_index1 = failed_block_index2;
						failed_block_index2 = t;
					}
					raid6_2data_recov(raid_disks, chunk_size, failed_block_index1, failed_block_index2, (uint8_t**)blocks);
				}
			}

			err = lock_stripe(info, start, chunk_size, data_disks, sig);
			if(err != 0) {
				if (err != 2)
					unlock_all_stripes(info, sig);
				goto exitCheck;
			}

			int write_res1, write_res2;
			off64_t seek_res;

			seek_res = lseek64(source[failed_disk1],
					   offsets[failed_disk1] + start * chunk_size, SEEK_SET);
			if (seek_res < 0) {
				fprintf(stderr, "lseek failed for failed_disk1\n");
				unlock_all_stripes(info, sig);
				err = -1;
				goto exitCheck;
			}
			write_res1 = write(source[failed_disk1], stripes[failed_disk1], chunk_size);

			seek_res = lseek64(source[failed_disk2],
					   offsets[failed_disk2] + start * chunk_size, SEEK_SET);
			if (seek_res < 0) {
				fprintf(stderr, "lseek failed for failed_disk1\n");
				unlock_all_stripes(info, sig);
				err = -1;
				goto exitCheck;
			}
			write_res2 = write(source[failed_disk2], stripes[failed_disk2], chunk_size);

			err = unlock_all_stripes(info, sig);
			if(err != 0)
				goto exitCheck;

			if (write_res1 != chunk_size || write_res2 != chunk_size) {
				fprintf(stderr, "Failed to write a complete chunk.\n");
				goto exitCheck;
			}

		}

		int pages_to_write_count = 0;
		int page_to_write[chunk_size >> CHECK_PAGE_BITS];
		for(j = 0; j < (chunk_size >> CHECK_PAGE_BITS); j++) {
			if (disk[j] >= 0 && repair == AUTO_REPAIR) {
				printf("Auto-repairing slot %d (%s)\n", disk[j], name[disk[j]]);
				pages_to_write_count++;
				page_to_write[j] = 1;
				for(i = 0; i < raid_disks; i++) {
					blocks_page[i] = blocks[i] + j * CHECK_PAGE_SIZE;
				}
				if (disk[j] == diskQ) {
					qsyndrome(p, (uint8_t*)stripes[diskQ], (uint8_t**)blocks_page, data_disks, CHECK_PAGE_SIZE);
				} else {
					char *all_but_failed_blocks[data_disks];
					int failed_block_index = block_index_for_slot[disk[j]];
					for (i=0; i < data_disks; i++)
						if (failed_block_index == i)
							all_but_failed_blocks[i] = stripes[diskP] + j * CHECK_PAGE_SIZE;
						else
							all_but_failed_blocks[i] = blocks_page[i];
					xor_blocks(stripes[disk[j]] + j * CHECK_PAGE_SIZE,
					all_but_failed_blocks, data_disks, CHECK_PAGE_SIZE);
				}
			} else {
				page_to_write[j] = 0;
			}
		}

		if(pages_to_write_count > 0) {

			err = lock_stripe(info, start, chunk_size, data_disks, sig);
			if(err != 0) {
				if (err != 2)
					unlock_all_stripes(info, sig);
				goto exitCheck;
			}

			int write_res = 0;
			for(j = 0; j < (chunk_size >> CHECK_PAGE_BITS); j++) {
				if(page_to_write[j] == 1) {
					lseek64(source[disk[j]], offsets[disk[j]] + start * chunk_size + j * CHECK_PAGE_SIZE, 0);
					write_res += write(source[disk[j]], stripes[disk[j]] + j * CHECK_PAGE_SIZE, CHECK_PAGE_SIZE);
				}
			}

			err = unlock_all_stripes(info, sig);
			if (err != 0 || write_res != (CHECK_PAGE_SIZE * pages_to_write_count))
				goto exitCheck;

			if (write_res != (CHECK_PAGE_SIZE * pages_to_write_count)) {
				fprintf(stderr, "Failed to write a full chunk.\n");
				goto exitCheck;
			}
		}

		length--;
		start++;
	}

exitCheck:

	free(stripe_buf);
	free(stripes);
	free(blocks);
	free(blocks_page);
	free(block_index_for_slot);
	free(p);
	free(q);
	free(results);
	free(sig);

	return err;
}

unsigned long long getnum(char *str, char **err)
{
	char *e;
	unsigned long long rv = strtoull(str, &e, 10);
	if (e==str || *e) {
		*err = str;
		return 0;
	}
	return rv;
}

int main(int argc, char *argv[])
{
	/* md_device start length */
	int *fds = NULL;
	char *buf = NULL;
	char **disk_name = NULL;
	unsigned long long *offsets = NULL;
	int raid_disks = 0;
	int active_disks;
	int chunk_size = 0;
	int layout = -1;
	int level = 6;
	enum repair repair = NO_REPAIR;
	int failed_disk1 = -1;
	int failed_disk2 = -1;
	unsigned long long start, length;
	int i;
	int mdfd;
	struct mdinfo *info = NULL, *comp = NULL;
	char *err = NULL;
	int exit_err = 0;
	int close_flag = 0;
	char *prg = strrchr(argv[0], '/');

	if (prg == NULL)
		prg = argv[0];
	else
		prg++;

	if (argc < 4) {
		fprintf(stderr, "Usage: %s md_device start_stripe length_stripes [autorepair]\n", prg);
		fprintf(stderr, "   or: %s md_device repair stripe failed_slot_1 failed_slot_2\n", prg);
		exit_err = 1;
		goto exitHere;
	}

	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);
			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);
}
Commit	Line	Data
979afcb8 PS	1	/*
	2	* raid6check - extended consistency check for RAID-6
	3	*
	4	* Copyright (C) 2011 Piergiorgio Sartor
	5	*
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*
	21	* Author: Piergiorgio Sartor
	22	* Based on "restripe.c" from "mdadm" codebase
	23	*/
	24
	25	#include "mdadm.h"
	26	#include <stdint.h>
8d8ab389 PS	27	#include <signal.h>
8d8ab389 PS	28	#include <sys/mman.h>
979afcb8	29
3b9c9603 PS	30	#define CHECK_PAGE_BITS (12)
	31	#define CHECK_PAGE_SIZE (1 << CHECK_PAGE_BITS)
	32
635b5861 BS	33	enum repair {
	34	NO_REPAIR = 0,
	35	MANUAL_REPAIR,
	36	AUTO_REPAIR
	37	};
	38
979afcb8 PS	39	int geo_map(int block, unsigned long long stripe, int raid_disks,
	40	int level, int layout);
	41	void qsyndrome(uint8_t p, uint8_t q, uint8_t **sources, int disks, int size);
	42	void make_tables(void);
f2e29ad6 RB	43	void ensure_zero_has_size(int chunk_size);
	44	void raid6_datap_recov(int disks, size_t bytes, int faila, uint8_t **ptrs);
	45	void raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
	46	uint8_t **ptrs);
	47	void xor_blocks(char target, char *sources, int disks, int size);
	48
979afcb8 PS	49	/* Collect per stripe consistency information */
	50	void raid6_collect(int chunk_size, uint8_t p, uint8_t q,
	51	char chunkP, char chunkQ, int *results)
	52	{
	53	int i;
	54	int data_id;
	55	uint8_t Px, Qx;
	56	extern uint8_t raid6_gflog[];
	57
	58	for(i = 0; i < chunk_size; i++) {
	59	Px = (uint8_t)chunkP[i] ^ (uint8_t)p[i];
	60	Qx = (uint8_t)chunkQ[i] ^ (uint8_t)q[i];
	61
	62	if((Px != 0) && (Qx == 0))
	63	results[i] = -1;
	64
	65	if((Px == 0) && (Qx != 0))
	66	results[i] = -2;
	67
	68	if((Px != 0) && (Qx != 0)) {
	69	data_id = (raid6_gflog[Qx] - raid6_gflog[Px]);
	70	if(data_id < 0) data_id += 255;
	71	results[i] = data_id;
	72	}
	73
	74	if((Px == 0) && (Qx == 0))
	75	results[i] = -255;
	76	}
	77	}
	78
3b9c9603 PS	79	/* Try to find out if a specific disk has problems in a CHECK_PAGE_SIZE page size */
3b9c9603 PS	80	int raid6_stats_blk(int *results, int raid_disks)
979afcb8 PS	81	{
	82	int i;
	83	int curr_broken_disk = -255;
	84	int prev_broken_disk = -255;
	85	int broken_status = 0;
	86
3b9c9603	87	for(i = 0; i < CHECK_PAGE_SIZE; i++) {
979afcb8 PS	88
	89	if(results[i] != -255)
	90	curr_broken_disk = results[i];
	91
	92	if(curr_broken_disk >= raid_disks)
	93	broken_status = 2;
	94
	95	switch(broken_status) {
	96	case 0:
	97	if(curr_broken_disk != -255) {
	98	prev_broken_disk = curr_broken_disk;
	99	broken_status = 1;
	100	}
	101	break;
	102
	103	case 1:
	104	if(curr_broken_disk != prev_broken_disk)
	105	broken_status = 2;
	106	break;
	107
	108	case 2:
	109	default:
	110	curr_broken_disk = prev_broken_disk = -65535;
	111	break;
	112	}
	113	}
	114
	115	return curr_broken_disk;
	116	}
	117
3b9c9603 PS	118	/* Collect disks status for a strip in CHECK_PAGE_SIZE page size blocks */
	119	void raid6_stats(int disk, int results, int raid_disks, int chunk_size)
	120	{
	121	int i, j;
	122
	123	for(i = 0, j = 0; i < chunk_size; i += CHECK_PAGE_SIZE, j++) {
	124	disk[j] = raid6_stats_blk(&results[i], raid_disks);
	125	}
	126	}
	127
351d7680 RB	128	int lock_stripe(struct mdinfo *info, unsigned long long start,
	129	int chunk_size, int data_disks, sighandler_t *sig) {
	130	int rv;
	131	if(mlockall(MCL_CURRENT \| MCL_FUTURE) != 0) {
	132	return 2;
	133	}
	134
	135	sig[0] = signal(SIGTERM, SIG_IGN);
	136	sig[1] = signal(SIGINT, SIG_IGN);
	137	sig[2] = signal(SIGQUIT, SIG_IGN);
	138
	139	rv = sysfs_set_num(info, NULL, "suspend_lo", start * chunk_size * data_disks);
	140	rv \|= sysfs_set_num(info, NULL, "suspend_hi", (start + 1) * chunk_size * data_disks);
	141	return rv * 256;
	142	}
	143
	144	int unlock_all_stripes(struct mdinfo info, sighandler_t sig) {
	145	int rv;
	146	rv = sysfs_set_num(info, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
	147	rv \|= sysfs_set_num(info, NULL, "suspend_hi", 0);
	148	rv \|= sysfs_set_num(info, NULL, "suspend_lo", 0);
	149
	150	signal(SIGQUIT, sig[2]);
	151	signal(SIGINT, sig[1]);
	152	signal(SIGTERM, sig[0]);
	153
	154	if(munlockall() != 0)
	155	return 3;
	156	return rv * 256;
	157	}
	158
8d8ab389	159	int check_stripes(struct mdinfo info, int source, unsigned long long *offsets,
979afcb8	160	int raid_disks, int chunk_size, int level, int layout,
f2e29ad6	161	unsigned long long start, unsigned long long length, char *name[],
635b5861	162	enum repair repair, int failed_disk1, int failed_disk2)
979afcb8 PS	163	{
979afcb8 PS	164	/* read the data and p and q blocks, and check we got them right */
503975b9 N	165	char stripe_buf = xmalloc(raid_disks chunk_size);
	166	char *stripes = xmalloc(raid_disks sizeof(char*));
	167	char *blocks = xmalloc(raid_disks sizeof(char*));
3b9c9603	168	char *blocks_page = xmalloc(raid_disks sizeof(char*));
696e95a1	169	int block_index_for_slot = xmalloc(raid_disks sizeof(int));
503975b9 N	170	uint8_t *p = xmalloc(chunk_size);
	171	uint8_t *q = xmalloc(chunk_size);
	172	int results = xmalloc(chunk_size sizeof(int));
351d7680	173	sighandler_t sig = xmalloc(3 sizeof(sighandler_t));
979afcb8	174
3b9c9603	175	int i, j;
979afcb8 PS	176	int diskP, diskQ;
979afcb8 PS	177	int data_disks = raid_disks - 2;
af3c3750	178	int err = 0;
979afcb8 PS	179
	180	extern int tables_ready;
	181
	182	if (!tables_ready)
	183	make_tables();
	184
	185	for ( i = 0 ; i < raid_disks ; i++)
	186	stripes[i] = stripe_buf + i * chunk_size;
	187
	188	while (length > 0) {
3b9c9603	189	int disk[chunk_size >> CHECK_PAGE_BITS];
979afcb8	190
351d7680 RB	191	err = lock_stripe(info, start, chunk_size, data_disks, sig);
	192	if(err != 0) {
	193	if (err != 2)
	194	unlock_all_stripes(info, sig);
8d8ab389 PS	195	goto exitCheck;
8d8ab389 PS	196	}
979afcb8	197	for (i = 0 ; i < raid_disks ; i++) {
2161adce BS	198	off64_t seek_res = lseek64(source[i], offsets[i] + start * chunk_size,
	199	SEEK_SET);
	200	if (seek_res < 0) {
	201	fprintf(stderr, "lseek to source %d failed\n", i);
	202	unlock_all_stripes(info, sig);
	203	err = -1;
	204	goto exitCheck;
	205	}
2c7b668d BS	206	int read_res = read(source[i], stripes[i], chunk_size);
	207	if (read_res < chunk_size) {
	208	fprintf(stderr, "Failed to read complete chunk disk %d, aborting\n", i);
	209	unlock_all_stripes(info, sig);
2161adce	210	err = -1;
2c7b668d BS	211	goto exitCheck;
2c7b668d BS	212	}
979afcb8	213	}
351d7680 RB	214	err = unlock_all_stripes(info, sig);
351d7680 RB	215	if(err != 0)
8d8ab389	216	goto exitCheck;
8d8ab389	217
979afcb8	218	for (i = 0 ; i < data_disks ; i++) {
af3c3750	219	int disk = geo_map(i, start, raid_disks, level, layout);
979afcb8	220	blocks[i] = stripes[disk];
696e95a1	221	block_index_for_slot[disk] = i;
979afcb8 PS	222	}
	223
	224	qsyndrome(p, q, (uint8_t**)blocks, data_disks, chunk_size);
af3c3750	225	diskP = geo_map(-1, start, raid_disks, level, layout);
f2e29ad6 RB	226	diskQ = geo_map(-2, start, raid_disks, level, layout);
f2e29ad6 RB	227	blocks[data_disks] = stripes[diskP];
696e95a1	228	block_index_for_slot[diskP] = data_disks;
f2e29ad6	229	blocks[data_disks+1] = stripes[diskQ];
696e95a1	230	block_index_for_slot[diskQ] = data_disks+1;
3b9c9603 PS	231	/* Do we really need the code below? */
3b9c9603 PS	232	#if 0
979afcb8	233	if (memcmp(p, stripes[diskP], chunk_size) != 0) {
af3c3750	234	printf("P(%d) wrong at %llu\n", diskP, start);
979afcb8	235	}
979afcb8	236	if (memcmp(q, stripes[diskQ], chunk_size) != 0) {
af3c3750	237	printf("Q(%d) wrong at %llu\n", diskQ, start);
979afcb8	238	}
3b9c9603	239	#endif
af3c3750	240	raid6_collect(chunk_size, p, q, stripes[diskP], stripes[diskQ], results);
3b9c9603	241	raid6_stats(disk, results, raid_disks, chunk_size);
979afcb8	242
3b9c9603 PS	243	for(j = 0; j < (chunk_size >> CHECK_PAGE_BITS); j++) {
	244	if(disk[j] >= -2) {
	245	disk[j] = geo_map(disk[j], start, raid_disks, level, layout);
	246	}
	247	if(disk[j] >= 0) {
	248	printf("Error detected at %llu, page %d: possible failed disk slot: %d --> %s\n",
	249	start, j, disk[j], name[disk[j]]);
	250	}
	251	if(disk[j] == -65535) {
	252	printf("Error detected at %llu, page %d: disk slot unknown\n", start, j);
	253	}
979afcb8	254	}
3b9c9603	255
635b5861	256	if(repair == MANUAL_REPAIR) {
f2e29ad6 RB	257	printf("Repairing stripe %llu\n", start);
	258	printf("Assuming slots %d (%s) and %d (%s) are incorrect\n",
	259	failed_disk1, name[failed_disk1],
	260	failed_disk2, name[failed_disk2]);
	261
	262	if (failed_disk1 == diskQ \|\| failed_disk2 == diskQ) {
	263	char *all_but_failed_blocks[data_disks];
696e95a1	264	int failed_data_or_p;
f2e29ad6 RB	265	int failed_block_index;
	266
	267	if (failed_disk1 == diskQ)
696e95a1	268	failed_data_or_p = failed_disk2;
f2e29ad6	269	else
696e95a1 RB	270	failed_data_or_p = failed_disk1;
	271	printf("Repairing D/P(%d) and Q\n", failed_data_or_p);
	272	failed_block_index = block_index_for_slot[failed_data_or_p];
f2e29ad6 RB	273	for (i=0; i < data_disks; i++)
	274	if (failed_block_index == i)
	275	all_but_failed_blocks[i] = stripes[diskP];
	276	else
	277	all_but_failed_blocks[i] = blocks[i];
696e95a1	278	xor_blocks(stripes[failed_data_or_p],
f2e29ad6 RB	279	all_but_failed_blocks, data_disks, chunk_size);
	280	qsyndrome(p, (uint8_t)stripes[diskQ], (uint8_t*)blocks, data_disks, chunk_size);
	281	} else {
	282	ensure_zero_has_size(chunk_size);
	283	if (failed_disk1 == diskP \|\| failed_disk2 == diskP) {
	284	int failed_data, failed_block_index;
	285	if (failed_disk1 == diskP)
	286	failed_data = failed_disk2;
	287	else
	288	failed_data = failed_disk1;
696e95a1	289	failed_block_index = block_index_for_slot[failed_data];
f2e29ad6 RB	290	printf("Repairing D(%d) and P\n", failed_data);
	291	raid6_datap_recov(raid_disks, chunk_size, failed_block_index, (uint8_t**)blocks);
	292	} else {
	293	printf("Repairing D and D\n");
696e95a1 RB	294	int failed_block_index1 = block_index_for_slot[failed_disk1];
696e95a1 RB	295	int failed_block_index2 = block_index_for_slot[failed_disk2];
f2e29ad6 RB	296	if (failed_block_index1 > failed_block_index2) {
	297	int t = failed_block_index1;
	298	failed_block_index1 = failed_block_index2;
	299	failed_block_index2 = t;
	300	}
	301	raid6_2data_recov(raid_disks, chunk_size, failed_block_index1, failed_block_index2, (uint8_t**)blocks);
	302	}
	303	}
351d7680 RB	304
	305	err = lock_stripe(info, start, chunk_size, data_disks, sig);
	306	if(err != 0) {
	307	if (err != 2)
	308	unlock_all_stripes(info, sig);
f2e29ad6 RB	309	goto exitCheck;
f2e29ad6 RB	310	}
351d7680	311
2c7b668d	312	int write_res1, write_res2;
2161adce	313	off64_t seek_res;
2c7b668d	314
2161adce BS	315	seek_res = lseek64(source[failed_disk1],
	316	offsets[failed_disk1] + start * chunk_size, SEEK_SET);
	317	if (seek_res < 0) {
	318	fprintf(stderr, "lseek failed for failed_disk1\n");
	319	unlock_all_stripes(info, sig);
	320	err = -1;
	321	goto exitCheck;
	322	}
2c7b668d	323	write_res1 = write(source[failed_disk1], stripes[failed_disk1], chunk_size);
2161adce	324
2161adce BS	325	seek_res = lseek64(source[failed_disk2],
	326	offsets[failed_disk2] + start * chunk_size, SEEK_SET);
	327	if (seek_res < 0) {
	328	fprintf(stderr, "lseek failed for failed_disk1\n");
	329	unlock_all_stripes(info, sig);
	330	err = -1;
	331	goto exitCheck;
	332	}
2c7b668d	333	write_res2 = write(source[failed_disk2], stripes[failed_disk2], chunk_size);
f2e29ad6	334
8a63c731 RB	335	err = unlock_all_stripes(info, sig);
	336	if(err != 0)
	337	goto exitCheck;
2c7b668d	338
2c7b668d BS	339	if (write_res1 != chunk_size \|\| write_res2 != chunk_size) {
	340	fprintf(stderr, "Failed to write a complete chunk.\n");
	341	goto exitCheck;
	342	}
	343
3b9c9603 PS	344	}
	345
	346	int pages_to_write_count = 0;
	347	int page_to_write[chunk_size >> CHECK_PAGE_BITS];
	348	for(j = 0; j < (chunk_size >> CHECK_PAGE_BITS); j++) {
	349	if (disk[j] >= 0 && repair == AUTO_REPAIR) {
	350	printf("Auto-repairing slot %d (%s)\n", disk[j], name[disk[j]]);
	351	pages_to_write_count++;
	352	page_to_write[j] = 1;
	353	for(i = 0; i < raid_disks; i++) {
	354	blocks_page[i] = blocks[i] + j * CHECK_PAGE_SIZE;
	355	}
	356	if (disk[j] == diskQ) {
	357	qsyndrome(p, (uint8_t)stripes[diskQ], (uint8_t*)blocks_page, data_disks, CHECK_PAGE_SIZE);
	358	} else {
	359	char *all_but_failed_blocks[data_disks];
	360	int failed_block_index = block_index_for_slot[disk[j]];
	361	for (i=0; i < data_disks; i++)
	362	if (failed_block_index == i)
	363	all_but_failed_blocks[i] = stripes[diskP] + j * CHECK_PAGE_SIZE;
	364	else
	365	all_but_failed_blocks[i] = blocks_page[i];
	366	xor_blocks(stripes[disk[j]] + j * CHECK_PAGE_SIZE,
	367	all_but_failed_blocks, data_disks, CHECK_PAGE_SIZE);
	368	}
8a63c731	369	} else {
3b9c9603	370	page_to_write[j] = 0;
8a63c731	371	}
3b9c9603 PS	372	}
	373
	374	if(pages_to_write_count > 0) {
8a63c731 RB	375
	376	err = lock_stripe(info, start, chunk_size, data_disks, sig);
	377	if(err != 0) {
	378	if (err != 2)
	379	unlock_all_stripes(info, sig);
	380	goto exitCheck;
	381	}
	382
3b9c9603 PS	383	int write_res = 0;
	384	for(j = 0; j < (chunk_size >> CHECK_PAGE_BITS); j++) {
	385	if(page_to_write[j] == 1) {
	386	lseek64(source[disk[j]], offsets[disk[j]] + start * chunk_size + j * CHECK_PAGE_SIZE, 0);
	387	write_res += write(source[disk[j]], stripes[disk[j]] + j * CHECK_PAGE_SIZE, CHECK_PAGE_SIZE);
	388	}
	389	}
8a63c731	390
351d7680	391	err = unlock_all_stripes(info, sig);
3b9c9603	392	if (err != 0 \|\| write_res != (CHECK_PAGE_SIZE * pages_to_write_count))
f2e29ad6	393	goto exitCheck;
2c7b668d	394
3b9c9603	395	if (write_res != (CHECK_PAGE_SIZE * pages_to_write_count)) {
2c7b668d BS	396	fprintf(stderr, "Failed to write a full chunk.\n");
	397	goto exitCheck;
	398	}
f2e29ad6 RB	399	}
f2e29ad6 RB	400
af3c3750 PS	401	length--;
af3c3750 PS	402	start++;
979afcb8 PS	403	}
979afcb8 PS	404
af3c3750 PS	405	exitCheck:
af3c3750 PS	406
979afcb8 PS	407	free(stripe_buf);
	408	free(stripes);
	409	free(blocks);
3b9c9603	410	free(blocks_page);
3a89d754	411	free(block_index_for_slot);
979afcb8 PS	412	free(p);
	413	free(q);
	414	free(results);
3a89d754	415	free(sig);
979afcb8	416
af3c3750	417	return err;
979afcb8 PS	418	}
	419
	420	unsigned long long getnum(char str, char *err)
	421	{
	422	char *e;
	423	unsigned long long rv = strtoull(str, &e, 10);
	424	if (e==str \|\| *e) {
	425	*err = str;
	426	return 0;
	427	}
	428	return rv;
	429	}
	430
	431	int main(int argc, char *argv[])
	432	{
a9c2c6c6	433	/* md_device start length */
af3c3750 PS	434	int *fds = NULL;
	435	char *buf = NULL;
	436	char **disk_name = NULL;
	437	unsigned long long *offsets = NULL;
	438	int raid_disks = 0;
2cf31121	439	int active_disks;
af3c3750 PS	440	int chunk_size = 0;
af3c3750 PS	441	int layout = -1;
979afcb8	442	int level = 6;
635b5861	443	enum repair repair = NO_REPAIR;
2c7b668d BS	444	int failed_disk1 = -1;
2c7b668d BS	445	int failed_disk2 = -1;
979afcb8 PS	446	unsigned long long start, length;
979afcb8 PS	447	int i;
a9c2c6c6	448	int mdfd;
8d8ab389	449	struct mdinfo info = NULL, comp = NULL;
979afcb8	450	char *err = NULL;
af3c3750 PS	451	int exit_err = 0;
	452	int close_flag = 0;
	453	char *prg = strrchr(argv[0], '/');
	454
	455	if (prg == NULL)
	456	prg = argv[0];
	457	else
	458	prg++;
	459
	460	if (argc < 4) {
8a63c731	461	fprintf(stderr, "Usage: %s md_device start_stripe length_stripes [autorepair]\n", prg);
f2e29ad6	462	fprintf(stderr, " or: %s md_device repair stripe failed_slot_1 failed_slot_2\n", prg);
af3c3750 PS	463	exit_err = 1;
af3c3750 PS	464	goto exitHere;
979afcb8 PS	465	}
979afcb8 PS	466
a9c2c6c6 PS	467	mdfd = open(argv[1], O_RDONLY);
	468	if(mdfd < 0) {
	469	perror(argv[1]);
e7b84f9d	470	fprintf(stderr, "%s: cannot open %s\n", prg, argv[1]);
af3c3750 PS	471	exit_err = 2;
af3c3750 PS	472	goto exitHere;
a9c2c6c6 PS	473	}
a9c2c6c6 PS	474
f8fcf7a1	475	info = sysfs_read(mdfd, NULL,
a9c2c6c6 PS	476	GET_LEVEL\|
	477	GET_LAYOUT\|
	478	GET_DISKS\|
2cf31121	479	GET_DEGRADED \|
a9c2c6c6 PS	480	GET_COMPONENT\|
	481	GET_CHUNK\|
	482	GET_DEVS\|
	483	GET_OFFSET\|
	484	GET_SIZE);
	485
8d8ab389 PS	486	if(info == NULL) {
	487	fprintf(stderr, "%s: Error reading sysfs information of %s\n", prg, argv[1]);
	488	exit_err = 9;
	489	goto exitHere;
	490	}
	491
a9c2c6c6 PS	492	if(info->array.level != level) {
a9c2c6c6 PS	493	fprintf(stderr, "%s: %s not a RAID-6\n", prg, argv[1]);
af3c3750 PS	494	exit_err = 3;
af3c3750 PS	495	goto exitHere;
a9c2c6c6 PS	496	}
a9c2c6c6 PS	497
2cf31121 PS	498	if(info->array.failed_disks > 0) {
	499	fprintf(stderr, "%s: %s degraded array\n", prg, argv[1]);
	500	exit_err = 8;
	501	goto exitHere;
	502	}
	503
a9c2c6c6 PS	504	printf("layout: %d\n", info->array.layout);
a9c2c6c6 PS	505	printf("disks: %d\n", info->array.raid_disks);
af3c3750 PS	506	printf("component size: %llu\n", info->component_size * 512);
af3c3750 PS	507	printf("total stripes: %llu\n", (info->component_size * 512) / info->array.chunk_size);
a9c2c6c6 PS	508	printf("chunk size: %d\n", info->array.chunk_size);
	509	printf("\n");
	510
	511	comp = info->devs;
2cf31121	512	for(i = 0, active_disks = 0; active_disks < info->array.raid_disks; i++) {
a9c2c6c6	513	printf("disk: %d - offset: %llu - size: %llu - name: %s - slot: %d\n",
af3c3750	514	i, comp->data_offset * 512, comp->component_size * 512,
a9c2c6c6 PS	515	map_dev(comp->disk.major, comp->disk.minor, 0),
a9c2c6c6 PS	516	comp->disk.raid_disk);
2cf31121 PS	517	if(comp->disk.raid_disk >= 0)
2cf31121 PS	518	active_disks++;
a9c2c6c6 PS	519	comp = comp->next;
	520	}
	521	printf("\n");
	522
	523	close(mdfd);
	524
	525	raid_disks = info->array.raid_disks;
	526	chunk_size = info->array.chunk_size;
	527	layout = info->array.layout;
f2e29ad6 RB	528	if (strcmp(argv[2], "repair")==0) {
	529	if (argc < 6) {
	530	fprintf(stderr, "For repair mode, call %s md_device repair stripe failed_slot_1 failed_slot_2\n", prg);
	531	exit_err = 1;
	532	goto exitHere;
	533	}
635b5861	534	repair = MANUAL_REPAIR;
f2e29ad6 RB	535	start = getnum(argv[3], &err);
	536	length = 1;
	537	failed_disk1 = getnum(argv[4], &err);
	538	failed_disk2 = getnum(argv[5], &err);
	539
b67e45b8	540	if(failed_disk1 >= info->array.raid_disks) {
f2e29ad6 RB	541	fprintf(stderr, "%s: failed_slot_1 index is higher than number of devices in raid\n", prg);
	542	exit_err = 4;
	543	goto exitHere;
	544	}
b67e45b8	545	if(failed_disk2 >= info->array.raid_disks) {
f2e29ad6 RB	546	fprintf(stderr, "%s: failed_slot_2 index is higher than number of devices in raid\n", prg);
	547	exit_err = 4;
	548	goto exitHere;
	549	}
	550	if(failed_disk1 == failed_disk2) {
	551	fprintf(stderr, "%s: failed_slot_1 and failed_slot_2 are the same\n", prg);
	552	exit_err = 4;
	553	goto exitHere;
	554	}
	555	}
	556	else {
	557	start = getnum(argv[2], &err);
	558	length = getnum(argv[3], &err);
8a63c731	559	if (argc >= 5 && strcmp(argv[4], "autorepair")==0)
635b5861	560	repair = AUTO_REPAIR;
f2e29ad6	561	}
a9c2c6c6	562
979afcb8	563	if (err) {
a9c2c6c6	564	fprintf(stderr, "%s: Bad number: %s\n", prg, err);
af3c3750 PS	565	exit_err = 4;
af3c3750 PS	566	goto exitHere;
979afcb8	567	}
a9c2c6c6	568
af3c3750 PS	569	if(start > ((info->component_size * 512) / chunk_size)) {
	570	start = (info->component_size * 512) / chunk_size;
	571	fprintf(stderr, "%s: start beyond disks size\n", prg);
	572	}
a9c2c6c6	573
af3c3750 PS	574	if((length == 0) \|\|
	575	((length + start) > ((info->component_size * 512) / chunk_size))) {
	576	length = (info->component_size * 512) / chunk_size - start;
979afcb8	577	}
a9c2c6c6	578
503975b9 N	579	disk_name = xmalloc(raid_disks * sizeof(*disk_name));
	580	fds = xmalloc(raid_disks * sizeof(*fds));
	581	offsets = xcalloc(raid_disks, sizeof(*offsets));
	582	buf = xmalloc(raid_disks * chunk_size);
af3c3750	583
af3c3750 PS	584	for(i=0; i<raid_disks; i++) {
	585	fds[i] = -1;
	586	}
	587	close_flag = 1;
979afcb8	588
a9c2c6c6	589	comp = info->devs;
2cf31121	590	for (i=0, active_disks=0; active_disks<raid_disks; i++) {
a9c2c6c6	591	int disk_slot = comp->disk.raid_disk;
2cf31121 PS	592	if(disk_slot >= 0) {
	593	disk_name[disk_slot] = map_dev(comp->disk.major, comp->disk.minor, 0);
	594	offsets[disk_slot] = comp->data_offset * 512;
	595	fds[disk_slot] = open(disk_name[disk_slot], O_RDWR);
	596	if (fds[disk_slot] < 0) {
	597	perror(disk_name[disk_slot]);
	598	fprintf(stderr,"%s: cannot open %s\n", prg, disk_name[disk_slot]);
	599	exit_err = 6;
	600	goto exitHere;
	601	}
	602	active_disks++;
979afcb8	603	}
a9c2c6c6	604	comp = comp->next;
979afcb8 PS	605	}
979afcb8 PS	606
8d8ab389	607	int rv = check_stripes(info, fds, offsets,
979afcb8	608	raid_disks, chunk_size, level, layout,
f2e29ad6	609	start, length, disk_name, repair, failed_disk1, failed_disk2);
979afcb8 PS	610	if (rv != 0) {
979afcb8 PS	611	fprintf(stderr,
a9c2c6c6	612	"%s: check_stripes returned %d\n", prg, rv);
af3c3750 PS	613	exit_err = 7;
af3c3750 PS	614	goto exitHere;
979afcb8 PS	615	}
979afcb8 PS	616
af3c3750 PS	617	exitHere:
	618
	619	if (close_flag)
	620	for(i = 0; i < raid_disks; i++)
	621	close(fds[i]);
	622
a9c2c6c6	623	free(disk_name);
979afcb8 PS	624	free(fds);
	625	free(offsets);
	626	free(buf);
	627
af3c3750	628	exit(exit_err);
979afcb8	629	}