[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;
}

/* Autorepair */
int autorepair(int *disk, int diskP, int diskQ, unsigned long long start, int chunk_size,
		char *name[], int raid_disks, int data_disks, char **blocks_page,
		char **blocks, uint8_t *p, char **stripes, int *block_index_for_slot,
		int *source, unsigned long long *offsets)
{
	int i, j;
	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) {
			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] + j * CHECK_PAGE_SIZE, (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) {
		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, SEEK_SET);
				write_res += write(source[disk[j]], stripes[disk[j]] + j * CHECK_PAGE_SIZE, CHECK_PAGE_SIZE);
			}
		}

		if (write_res != (CHECK_PAGE_SIZE * pages_to_write_count)) {
			fprintf(stderr, "Failed to write a full chunk.\n");
			return -1;
		}
	}

	return 0;
}

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;
			}
		}

		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;

		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 stripe %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 stripe %llu, page %d: disk slot unknown\n", start, j);
			}
		}

		if(repair == AUTO_REPAIR) {
			err = autorepair(disk, diskP, diskQ, start, chunk_size,
					name, raid_disks, data_disks, blocks_page,
					blocks, p, stripes, block_index_for_slot,
					source, offsets);
			if(err != 0) {
				unlock_all_stripes(info, sig);
				goto exitCheck;
			}
		}

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

		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;
			}

		}

		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 | 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);
}
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
c22ac3b1 PS	159	/* Autorepair */
	160	int autorepair(int *disk, int diskP, int diskQ, unsigned long long start, int chunk_size,
	161	char name[], int raid_disks, int data_disks, char *blocks_page,
	162	char *blocks, uint8_t p, char *stripes, int block_index_for_slot,
	163	int source, unsigned long long offsets)
	164	{
	165	int i, j;
	166	int pages_to_write_count = 0;
	167	int page_to_write[chunk_size >> CHECK_PAGE_BITS];
	168	for(j = 0; j < (chunk_size >> CHECK_PAGE_BITS); j++) {
	169	if (disk[j] >= 0) {
	170	printf("Auto-repairing slot %d (%s)\n", disk[j], name[disk[j]]);
	171	pages_to_write_count++;
	172	page_to_write[j] = 1;
	173	for(i = 0; i < raid_disks; i++) {
	174	blocks_page[i] = blocks[i] + j * CHECK_PAGE_SIZE;
	175	}
	176	if (disk[j] == diskQ) {
	177	qsyndrome(p, (uint8_t)stripes[diskQ] + j CHECK_PAGE_SIZE, (uint8_t**)blocks_page, data_disks, CHECK_PAGE_SIZE);
	178	}
	179	else {
	180	char *all_but_failed_blocks[data_disks];
	181	int failed_block_index = block_index_for_slot[disk[j]];
	182	for(i = 0; i < data_disks; i++) {
	183	if (failed_block_index == i) {
	184	all_but_failed_blocks[i] = stripes[diskP] + j * CHECK_PAGE_SIZE;
	185	}
	186	else {
	187	all_but_failed_blocks[i] = blocks_page[i];
	188	}
	189	}
	190	xor_blocks(stripes[disk[j]] + j * CHECK_PAGE_SIZE,
	191	all_but_failed_blocks, data_disks, CHECK_PAGE_SIZE);
	192	}
	193	}
	194	else {
	195	page_to_write[j] = 0;
	196	}
	197	}
	198
	199	if(pages_to_write_count > 0) {
	200	int write_res = 0;
	201	for(j = 0; j < (chunk_size >> CHECK_PAGE_BITS); j++) {
	202	if(page_to_write[j] == 1) {
	203	lseek64(source[disk[j]], offsets[disk[j]] + start * chunk_size + j * CHECK_PAGE_SIZE, SEEK_SET);
	204	write_res += write(source[disk[j]], stripes[disk[j]] + j * CHECK_PAGE_SIZE, CHECK_PAGE_SIZE);
	205	}
	206	}
	207
	208	if (write_res != (CHECK_PAGE_SIZE * pages_to_write_count)) {
	209	fprintf(stderr, "Failed to write a full chunk.\n");
	210	return -1;
	211	}
	212	}
	213
	214	return 0;
	215	}
	216
8d8ab389	217	int check_stripes(struct mdinfo info, int source, unsigned long long *offsets,
979afcb8	218	int raid_disks, int chunk_size, int level, int layout,
f2e29ad6	219	unsigned long long start, unsigned long long length, char *name[],
635b5861	220	enum repair repair, int failed_disk1, int failed_disk2)
979afcb8 PS	221	{
979afcb8 PS	222	/* read the data and p and q blocks, and check we got them right */
503975b9 N	223	char stripe_buf = xmalloc(raid_disks chunk_size);
	224	char *stripes = xmalloc(raid_disks sizeof(char*));
	225	char *blocks = xmalloc(raid_disks sizeof(char*));
3b9c9603	226	char *blocks_page = xmalloc(raid_disks sizeof(char*));
696e95a1	227	int block_index_for_slot = xmalloc(raid_disks sizeof(int));
503975b9 N	228	uint8_t *p = xmalloc(chunk_size);
	229	uint8_t *q = xmalloc(chunk_size);
	230	int results = xmalloc(chunk_size sizeof(int));
351d7680	231	sighandler_t sig = xmalloc(3 sizeof(sighandler_t));
979afcb8	232
3b9c9603	233	int i, j;
979afcb8 PS	234	int diskP, diskQ;
979afcb8 PS	235	int data_disks = raid_disks - 2;
af3c3750	236	int err = 0;
979afcb8 PS	237
	238	extern int tables_ready;
	239
	240	if (!tables_ready)
	241	make_tables();
	242
	243	for ( i = 0 ; i < raid_disks ; i++)
	244	stripes[i] = stripe_buf + i * chunk_size;
	245
	246	while (length > 0) {
3b9c9603	247	int disk[chunk_size >> CHECK_PAGE_BITS];
979afcb8	248
351d7680 RB	249	err = lock_stripe(info, start, chunk_size, data_disks, sig);
	250	if(err != 0) {
	251	if (err != 2)
	252	unlock_all_stripes(info, sig);
8d8ab389 PS	253	goto exitCheck;
8d8ab389 PS	254	}
979afcb8	255	for (i = 0 ; i < raid_disks ; i++) {
2161adce BS	256	off64_t seek_res = lseek64(source[i], offsets[i] + start * chunk_size,
	257	SEEK_SET);
	258	if (seek_res < 0) {
	259	fprintf(stderr, "lseek to source %d failed\n", i);
	260	unlock_all_stripes(info, sig);
	261	err = -1;
	262	goto exitCheck;
	263	}
2c7b668d BS	264	int read_res = read(source[i], stripes[i], chunk_size);
	265	if (read_res < chunk_size) {
	266	fprintf(stderr, "Failed to read complete chunk disk %d, aborting\n", i);
	267	unlock_all_stripes(info, sig);
2161adce	268	err = -1;
2c7b668d BS	269	goto exitCheck;
2c7b668d BS	270	}
979afcb8	271	}
8d8ab389	272
979afcb8	273	for (i = 0 ; i < data_disks ; i++) {
af3c3750	274	int disk = geo_map(i, start, raid_disks, level, layout);
979afcb8	275	blocks[i] = stripes[disk];
696e95a1	276	block_index_for_slot[disk] = i;
979afcb8 PS	277	}
	278
	279	qsyndrome(p, q, (uint8_t**)blocks, data_disks, chunk_size);
af3c3750	280	diskP = geo_map(-1, start, raid_disks, level, layout);
f2e29ad6 RB	281	diskQ = geo_map(-2, start, raid_disks, level, layout);
f2e29ad6 RB	282	blocks[data_disks] = stripes[diskP];
696e95a1	283	block_index_for_slot[diskP] = data_disks;
f2e29ad6	284	blocks[data_disks+1] = stripes[diskQ];
696e95a1	285	block_index_for_slot[diskQ] = data_disks+1;
237e40ce	286
af3c3750	287	raid6_collect(chunk_size, p, q, stripes[diskP], stripes[diskQ], results);
3b9c9603	288	raid6_stats(disk, results, raid_disks, chunk_size);
979afcb8	289
3b9c9603 PS	290	for(j = 0; j < (chunk_size >> CHECK_PAGE_BITS); j++) {
	291	if(disk[j] >= -2) {
	292	disk[j] = geo_map(disk[j], start, raid_disks, level, layout);
	293	}
	294	if(disk[j] >= 0) {
afc755e9	295	printf("Error detected at stripe %llu, page %d: possible failed disk slot: %d --> %s\n",
3b9c9603 PS	296	start, j, disk[j], name[disk[j]]);
	297	}
	298	if(disk[j] == -65535) {
afc755e9	299	printf("Error detected at stripe %llu, page %d: disk slot unknown\n", start, j);
3b9c9603	300	}
979afcb8	301	}
3b9c9603	302
3cfd0297	303	if(repair == AUTO_REPAIR) {
c22ac3b1 PS	304	err = autorepair(disk, diskP, diskQ, start, chunk_size,
	305	name, raid_disks, data_disks, blocks_page,
	306	blocks, p, stripes, block_index_for_slot,
	307	source, offsets);
	308	if(err != 0) {
	309	unlock_all_stripes(info, sig);
	310	goto exitCheck;
3cfd0297 PS	311	}
	312	}
	313
	314	err = unlock_all_stripes(info, sig);
	315	if(err != 0) {
	316	goto exitCheck;
	317	}
	318
635b5861	319	if(repair == MANUAL_REPAIR) {
f2e29ad6 RB	320	printf("Repairing stripe %llu\n", start);
	321	printf("Assuming slots %d (%s) and %d (%s) are incorrect\n",
	322	failed_disk1, name[failed_disk1],
	323	failed_disk2, name[failed_disk2]);
	324
	325	if (failed_disk1 == diskQ \|\| failed_disk2 == diskQ) {
	326	char *all_but_failed_blocks[data_disks];
696e95a1	327	int failed_data_or_p;
f2e29ad6 RB	328	int failed_block_index;
	329
	330	if (failed_disk1 == diskQ)
696e95a1	331	failed_data_or_p = failed_disk2;
f2e29ad6	332	else
696e95a1 RB	333	failed_data_or_p = failed_disk1;
	334	printf("Repairing D/P(%d) and Q\n", failed_data_or_p);
	335	failed_block_index = block_index_for_slot[failed_data_or_p];
f2e29ad6 RB	336	for (i=0; i < data_disks; i++)
	337	if (failed_block_index == i)
	338	all_but_failed_blocks[i] = stripes[diskP];
	339	else
	340	all_but_failed_blocks[i] = blocks[i];
696e95a1	341	xor_blocks(stripes[failed_data_or_p],
f2e29ad6 RB	342	all_but_failed_blocks, data_disks, chunk_size);
	343	qsyndrome(p, (uint8_t)stripes[diskQ], (uint8_t*)blocks, data_disks, chunk_size);
	344	} else {
	345	ensure_zero_has_size(chunk_size);
	346	if (failed_disk1 == diskP \|\| failed_disk2 == diskP) {
	347	int failed_data, failed_block_index;
	348	if (failed_disk1 == diskP)
	349	failed_data = failed_disk2;
	350	else
	351	failed_data = failed_disk1;
696e95a1	352	failed_block_index = block_index_for_slot[failed_data];
f2e29ad6 RB	353	printf("Repairing D(%d) and P\n", failed_data);
	354	raid6_datap_recov(raid_disks, chunk_size, failed_block_index, (uint8_t**)blocks);
	355	} else {
	356	printf("Repairing D and D\n");
696e95a1 RB	357	int failed_block_index1 = block_index_for_slot[failed_disk1];
696e95a1 RB	358	int failed_block_index2 = block_index_for_slot[failed_disk2];
f2e29ad6 RB	359	if (failed_block_index1 > failed_block_index2) {
	360	int t = failed_block_index1;
	361	failed_block_index1 = failed_block_index2;
	362	failed_block_index2 = t;
	363	}
	364	raid6_2data_recov(raid_disks, chunk_size, failed_block_index1, failed_block_index2, (uint8_t**)blocks);
	365	}
	366	}
351d7680 RB	367
	368	err = lock_stripe(info, start, chunk_size, data_disks, sig);
	369	if(err != 0) {
	370	if (err != 2)
	371	unlock_all_stripes(info, sig);
f2e29ad6 RB	372	goto exitCheck;
f2e29ad6 RB	373	}
351d7680	374
2c7b668d	375	int write_res1, write_res2;
2161adce	376	off64_t seek_res;
2c7b668d	377
2161adce BS	378	seek_res = lseek64(source[failed_disk1],
	379	offsets[failed_disk1] + start * chunk_size, SEEK_SET);
	380	if (seek_res < 0) {
	381	fprintf(stderr, "lseek failed for failed_disk1\n");
	382	unlock_all_stripes(info, sig);
	383	err = -1;
	384	goto exitCheck;
	385	}
2c7b668d	386	write_res1 = write(source[failed_disk1], stripes[failed_disk1], chunk_size);
2161adce	387
2161adce BS	388	seek_res = lseek64(source[failed_disk2],
	389	offsets[failed_disk2] + start * chunk_size, SEEK_SET);
	390	if (seek_res < 0) {
	391	fprintf(stderr, "lseek failed for failed_disk1\n");
	392	unlock_all_stripes(info, sig);
	393	err = -1;
	394	goto exitCheck;
	395	}
2c7b668d	396	write_res2 = write(source[failed_disk2], stripes[failed_disk2], chunk_size);
f2e29ad6	397
8a63c731 RB	398	err = unlock_all_stripes(info, sig);
	399	if(err != 0)
	400	goto exitCheck;
2c7b668d	401
2c7b668d BS	402	if (write_res1 != chunk_size \|\| write_res2 != chunk_size) {
	403	fprintf(stderr, "Failed to write a complete chunk.\n");
	404	goto exitCheck;
	405	}
	406
3b9c9603 PS	407	}
3b9c9603 PS	408
af3c3750 PS	409	length--;
af3c3750 PS	410	start++;
979afcb8 PS	411	}
979afcb8 PS	412
af3c3750 PS	413	exitCheck:
af3c3750 PS	414
979afcb8 PS	415	free(stripe_buf);
	416	free(stripes);
	417	free(blocks);
3b9c9603	418	free(blocks_page);
3a89d754	419	free(block_index_for_slot);
979afcb8 PS	420	free(p);
	421	free(q);
	422	free(results);
3a89d754	423	free(sig);
979afcb8	424
af3c3750	425	return err;
979afcb8 PS	426	}
	427
	428	unsigned long long getnum(char str, char *err)
	429	{
	430	char *e;
	431	unsigned long long rv = strtoull(str, &e, 10);
	432	if (e==str \|\| *e) {
	433	*err = str;
	434	return 0;
	435	}
	436	return rv;
	437	}
	438
	439	int main(int argc, char *argv[])
	440	{
a9c2c6c6	441	/* md_device start length */
af3c3750 PS	442	int *fds = NULL;
	443	char *buf = NULL;
	444	char **disk_name = NULL;
	445	unsigned long long *offsets = NULL;
	446	int raid_disks = 0;
2cf31121	447	int active_disks;
af3c3750 PS	448	int chunk_size = 0;
af3c3750 PS	449	int layout = -1;
979afcb8	450	int level = 6;
635b5861	451	enum repair repair = NO_REPAIR;
2c7b668d BS	452	int failed_disk1 = -1;
2c7b668d BS	453	int failed_disk2 = -1;
979afcb8 PS	454	unsigned long long start, length;
979afcb8 PS	455	int i;
a9c2c6c6	456	int mdfd;
8d8ab389	457	struct mdinfo info = NULL, comp = NULL;
979afcb8	458	char *err = NULL;
af3c3750 PS	459	int exit_err = 0;
	460	int close_flag = 0;
	461	char *prg = strrchr(argv[0], '/');
	462
	463	if (prg == NULL)
	464	prg = argv[0];
	465	else
	466	prg++;
	467
	468	if (argc < 4) {
8a63c731	469	fprintf(stderr, "Usage: %s md_device start_stripe length_stripes [autorepair]\n", prg);
f2e29ad6	470	fprintf(stderr, " or: %s md_device repair stripe failed_slot_1 failed_slot_2\n", prg);
af3c3750 PS	471	exit_err = 1;
af3c3750 PS	472	goto exitHere;
979afcb8 PS	473	}
979afcb8 PS	474
a9c2c6c6 PS	475	mdfd = open(argv[1], O_RDONLY);
	476	if(mdfd < 0) {
	477	perror(argv[1]);
e7b84f9d	478	fprintf(stderr, "%s: cannot open %s\n", prg, argv[1]);
af3c3750 PS	479	exit_err = 2;
af3c3750 PS	480	goto exitHere;
a9c2c6c6 PS	481	}
a9c2c6c6 PS	482
f8fcf7a1	483	info = sysfs_read(mdfd, NULL,
a9c2c6c6 PS	484	GET_LEVEL\|
	485	GET_LAYOUT\|
	486	GET_DISKS\|
2cf31121	487	GET_DEGRADED \|
a9c2c6c6 PS	488	GET_COMPONENT\|
	489	GET_CHUNK\|
	490	GET_DEVS\|
	491	GET_OFFSET\|
	492	GET_SIZE);
	493
8d8ab389 PS	494	if(info == NULL) {
	495	fprintf(stderr, "%s: Error reading sysfs information of %s\n", prg, argv[1]);
	496	exit_err = 9;
	497	goto exitHere;
	498	}
	499
a9c2c6c6 PS	500	if(info->array.level != level) {
a9c2c6c6 PS	501	fprintf(stderr, "%s: %s not a RAID-6\n", prg, argv[1]);
af3c3750 PS	502	exit_err = 3;
af3c3750 PS	503	goto exitHere;
a9c2c6c6 PS	504	}
a9c2c6c6 PS	505
2cf31121 PS	506	if(info->array.failed_disks > 0) {
	507	fprintf(stderr, "%s: %s degraded array\n", prg, argv[1]);
	508	exit_err = 8;
	509	goto exitHere;
	510	}
	511
a9c2c6c6 PS	512	printf("layout: %d\n", info->array.layout);
a9c2c6c6 PS	513	printf("disks: %d\n", info->array.raid_disks);
af3c3750 PS	514	printf("component size: %llu\n", info->component_size * 512);
af3c3750 PS	515	printf("total stripes: %llu\n", (info->component_size * 512) / info->array.chunk_size);
a9c2c6c6 PS	516	printf("chunk size: %d\n", info->array.chunk_size);
	517	printf("\n");
	518
	519	comp = info->devs;
2cf31121	520	for(i = 0, active_disks = 0; active_disks < info->array.raid_disks; i++) {
a9c2c6c6	521	printf("disk: %d - offset: %llu - size: %llu - name: %s - slot: %d\n",
af3c3750	522	i, comp->data_offset * 512, comp->component_size * 512,
a9c2c6c6 PS	523	map_dev(comp->disk.major, comp->disk.minor, 0),
a9c2c6c6 PS	524	comp->disk.raid_disk);
2cf31121 PS	525	if(comp->disk.raid_disk >= 0)
2cf31121 PS	526	active_disks++;
a9c2c6c6 PS	527	comp = comp->next;
	528	}
	529	printf("\n");
	530
	531	close(mdfd);
	532
	533	raid_disks = info->array.raid_disks;
	534	chunk_size = info->array.chunk_size;
	535	layout = info->array.layout;
f2e29ad6 RB	536	if (strcmp(argv[2], "repair")==0) {
	537	if (argc < 6) {
	538	fprintf(stderr, "For repair mode, call %s md_device repair stripe failed_slot_1 failed_slot_2\n", prg);
	539	exit_err = 1;
	540	goto exitHere;
	541	}
635b5861	542	repair = MANUAL_REPAIR;
f2e29ad6 RB	543	start = getnum(argv[3], &err);
	544	length = 1;
	545	failed_disk1 = getnum(argv[4], &err);
	546	failed_disk2 = getnum(argv[5], &err);
	547
b67e45b8	548	if(failed_disk1 >= info->array.raid_disks) {
f2e29ad6 RB	549	fprintf(stderr, "%s: failed_slot_1 index is higher than number of devices in raid\n", prg);
	550	exit_err = 4;
	551	goto exitHere;
	552	}
b67e45b8	553	if(failed_disk2 >= info->array.raid_disks) {
f2e29ad6 RB	554	fprintf(stderr, "%s: failed_slot_2 index is higher than number of devices in raid\n", prg);
	555	exit_err = 4;
	556	goto exitHere;
	557	}
	558	if(failed_disk1 == failed_disk2) {
	559	fprintf(stderr, "%s: failed_slot_1 and failed_slot_2 are the same\n", prg);
	560	exit_err = 4;
	561	goto exitHere;
	562	}
	563	}
	564	else {
	565	start = getnum(argv[2], &err);
	566	length = getnum(argv[3], &err);
8a63c731	567	if (argc >= 5 && strcmp(argv[4], "autorepair")==0)
635b5861	568	repair = AUTO_REPAIR;
f2e29ad6	569	}
a9c2c6c6	570
979afcb8	571	if (err) {
a9c2c6c6	572	fprintf(stderr, "%s: Bad number: %s\n", prg, err);
af3c3750 PS	573	exit_err = 4;
af3c3750 PS	574	goto exitHere;
979afcb8	575	}
a9c2c6c6	576
af3c3750 PS	577	if(start > ((info->component_size * 512) / chunk_size)) {
	578	start = (info->component_size * 512) / chunk_size;
	579	fprintf(stderr, "%s: start beyond disks size\n", prg);
	580	}
a9c2c6c6	581
af3c3750 PS	582	if((length == 0) \|\|
	583	((length + start) > ((info->component_size * 512) / chunk_size))) {
	584	length = (info->component_size * 512) / chunk_size - start;
979afcb8	585	}
a9c2c6c6	586
503975b9 N	587	disk_name = xmalloc(raid_disks * sizeof(*disk_name));
	588	fds = xmalloc(raid_disks * sizeof(*fds));
	589	offsets = xcalloc(raid_disks, sizeof(*offsets));
	590	buf = xmalloc(raid_disks * chunk_size);
af3c3750	591
af3c3750 PS	592	for(i=0; i<raid_disks; i++) {
	593	fds[i] = -1;
	594	}
	595	close_flag = 1;
979afcb8	596
a9c2c6c6	597	comp = info->devs;
2cf31121	598	for (i=0, active_disks=0; active_disks<raid_disks; i++) {
a9c2c6c6	599	int disk_slot = comp->disk.raid_disk;
2cf31121 PS	600	if(disk_slot >= 0) {
	601	disk_name[disk_slot] = map_dev(comp->disk.major, comp->disk.minor, 0);
	602	offsets[disk_slot] = comp->data_offset * 512;
e645b341	603	fds[disk_slot] = open(disk_name[disk_slot], O_RDWR \| O_SYNC);
2cf31121 PS	604	if (fds[disk_slot] < 0) {
	605	perror(disk_name[disk_slot]);
	606	fprintf(stderr,"%s: cannot open %s\n", prg, disk_name[disk_slot]);
	607	exit_err = 6;
	608	goto exitHere;
	609	}
	610	active_disks++;
979afcb8	611	}
a9c2c6c6	612	comp = comp->next;
979afcb8 PS	613	}
979afcb8 PS	614
8d8ab389	615	int rv = check_stripes(info, fds, offsets,
979afcb8	616	raid_disks, chunk_size, level, layout,
f2e29ad6	617	start, length, disk_name, repair, failed_disk1, failed_disk2);
979afcb8 PS	618	if (rv != 0) {
979afcb8 PS	619	fprintf(stderr,
a9c2c6c6	620	"%s: check_stripes returned %d\n", prg, rv);
af3c3750 PS	621	exit_err = 7;
af3c3750 PS	622	goto exitHere;
979afcb8 PS	623	}
979afcb8 PS	624
af3c3750 PS	625	exitHere:
	626
	627	if (close_flag)
	628	for(i = 0; i < raid_disks; i++)
	629	close(fds[i]);
	630
a9c2c6c6	631	free(disk_name);
979afcb8 PS	632	free(fds);
	633	free(offsets);
	634	free(buf);
	635
af3c3750	636	exit(exit_err);
979afcb8	637	}