[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>

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);

/* 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 */
int raid6_stats(int *results, int raid_disks, int chunk_size)
{
	int i;
	int curr_broken_disk = -255;
	int prev_broken_disk = -255;
	int broken_status = 0;

	for(i = 0; i < chunk_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;
}

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[])
{
	/* read the data and p and q blocks, and check we got them right */
	char *stripe_buf = malloc(raid_disks * chunk_size);
	char **stripes = malloc(raid_disks * sizeof(char*));
	char **blocks = malloc(raid_disks * sizeof(char*));
	uint8_t *p = malloc(chunk_size);
	uint8_t *q = malloc(chunk_size);
	int *results = malloc(chunk_size * sizeof(int));

	int i;
	int diskP, diskQ;
	int data_disks = raid_disks - 2;
	int err = 0;
	sighandler_t sig[3];
	int rv;

	extern int tables_ready;

	if((stripe_buf == NULL) ||
	   (stripes == NULL) ||
	   (blocks == NULL) ||
	   (p == NULL) ||
	   (q == NULL) ||
	   (results == NULL)) {
		err = 1;
		goto exitCheck;
	}

	if (!tables_ready)
		make_tables();

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

	while (length > 0) {
		int disk;

		printf("pos --> %llu\n", start);

		if(mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
			err = 2;
			goto exitCheck;
		}
		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);
		for (i = 0 ; i < raid_disks ; i++) {
			lseek64(source[i], offsets[i] + start * chunk_size, 0);
			read(source[i], stripes[i], chunk_size);
		}
		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) {
			err = 3;
			goto exitCheck;
		}

		if(rv != 0) {
			err = rv * 256;
			goto exitCheck;
		}

		for (i = 0 ; i < data_disks ; i++) {
			int disk = geo_map(i, start, raid_disks, level, layout);
			blocks[i] = stripes[disk];
			printf("%d->%d\n", i, disk);
		}

		qsyndrome(p, q, (uint8_t**)blocks, data_disks, chunk_size);
		diskP = geo_map(-1, start, raid_disks, level, layout);
		if (memcmp(p, stripes[diskP], chunk_size) != 0) {
			printf("P(%d) wrong at %llu\n", diskP, start);
		}
		diskQ = geo_map(-2, start, raid_disks, level, layout);
		if (memcmp(q, stripes[diskQ], chunk_size) != 0) {
			printf("Q(%d) wrong at %llu\n", diskQ, start);
		}
		raid6_collect(chunk_size, p, q, stripes[diskP], stripes[diskQ], results);
		disk = raid6_stats(results, raid_disks, chunk_size);

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

		length--;
		start++;
	}

exitCheck:

	free(stripe_buf);
	free(stripes);
	free(blocks);
	free(p);
	free(q);
	free(results);

	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;
	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\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, -1,
			  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;
	start = getnum(argv[2], &err);
	length = getnum(argv[3], &err);

	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 = malloc(raid_disks * sizeof(*disk_name));
	fds = malloc(raid_disks * sizeof(*fds));
	offsets = malloc(raid_disks * sizeof(*offsets));
	buf = malloc(raid_disks * chunk_size);

	if((disk_name == NULL) ||
	   (fds == NULL) ||
	   (offsets == NULL) ||
	   (buf == NULL)) {
		fprintf(stderr, "%s: allocation fail\n", prg);
		exit_err = 5;
		goto exitHere;
	}

	memset(offsets, 0, raid_disks * sizeof(*offsets));
	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);
	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 PS	29
	30	int geo_map(int block, unsigned long long stripe, int raid_disks,
	31	int level, int layout);
	32	void qsyndrome(uint8_t p, uint8_t q, uint8_t **sources, int disks, int size);
	33	void make_tables(void);
	34
	35	/* Collect per stripe consistency information */
	36	void raid6_collect(int chunk_size, uint8_t p, uint8_t q,
	37	char chunkP, char chunkQ, int *results)
	38	{
	39	int i;
	40	int data_id;
	41	uint8_t Px, Qx;
	42	extern uint8_t raid6_gflog[];
	43
	44	for(i = 0; i < chunk_size; i++) {
	45	Px = (uint8_t)chunkP[i] ^ (uint8_t)p[i];
	46	Qx = (uint8_t)chunkQ[i] ^ (uint8_t)q[i];
	47
	48	if((Px != 0) && (Qx == 0))
	49	results[i] = -1;
	50
	51	if((Px == 0) && (Qx != 0))
	52	results[i] = -2;
	53
	54	if((Px != 0) && (Qx != 0)) {
	55	data_id = (raid6_gflog[Qx] - raid6_gflog[Px]);
	56	if(data_id < 0) data_id += 255;
	57	results[i] = data_id;
	58	}
	59
	60	if((Px == 0) && (Qx == 0))
	61	results[i] = -255;
	62	}
	63	}
	64
	65	/* Try to find out if a specific disk has problems */
	66	int raid6_stats(int *results, int raid_disks, int chunk_size)
	67	{
	68	int i;
	69	int curr_broken_disk = -255;
	70	int prev_broken_disk = -255;
	71	int broken_status = 0;
	72
	73	for(i = 0; i < chunk_size; i++) {
	74
	75	if(results[i] != -255)
	76	curr_broken_disk = results[i];
	77
	78	if(curr_broken_disk >= raid_disks)
	79	broken_status = 2;
	80
	81	switch(broken_status) {
	82	case 0:
	83	if(curr_broken_disk != -255) {
	84	prev_broken_disk = curr_broken_disk;
	85	broken_status = 1;
	86	}
	87	break;
	88
	89	case 1:
	90	if(curr_broken_disk != prev_broken_disk)
	91	broken_status = 2;
	92	break;
93
94	case 2:
95	default:
96	curr_broken_disk = prev_broken_disk = -65535;
97	break;
98	}
99	}
100
101	return curr_broken_disk;
102	}
103
8d8ab389	104	int check_stripes(struct mdinfo info, int source, unsigned long long *offsets,
979afcb8 PS	105	int raid_disks, int chunk_size, int level, int layout,
	106	unsigned long long start, unsigned long long length, char *name[])
	107	{
	108	/* read the data and p and q blocks, and check we got them right */
	109	char stripe_buf = malloc(raid_disks chunk_size);
	110	char *stripes = malloc(raid_disks sizeof(char*));
	111	char *blocks = malloc(raid_disks sizeof(char*));
	112	uint8_t *p = malloc(chunk_size);
	113	uint8_t *q = malloc(chunk_size);
	114	int results = malloc(chunk_size sizeof(int));
	115
	116	int i;
	117	int diskP, diskQ;
	118	int data_disks = raid_disks - 2;
af3c3750	119	int err = 0;
8d8ab389 PS	120	sighandler_t sig[3];
8d8ab389 PS	121	int rv;
979afcb8 PS	122
	123	extern int tables_ready;
	124
af3c3750 PS	125	if((stripe_buf == NULL) \|\|
	126	(stripes == NULL) \|\|
	127	(blocks == NULL) \|\|
	128	(p == NULL) \|\|
	129	(q == NULL) \|\|
	130	(results == NULL)) {
	131	err = 1;
	132	goto exitCheck;
	133	}
	134
979afcb8 PS	135	if (!tables_ready)
	136	make_tables();
	137
	138	for ( i = 0 ; i < raid_disks ; i++)
	139	stripes[i] = stripe_buf + i * chunk_size;
	140
	141	while (length > 0) {
	142	int disk;
	143
af3c3750 PS	144	printf("pos --> %llu\n", start);
af3c3750 PS	145
8d8ab389 PS	146	if(mlockall(MCL_CURRENT \| MCL_FUTURE) != 0) {
	147	err = 2;
	148	goto exitCheck;
	149	}
	150	sig[0] = signal(SIGTERM, SIG_IGN);
	151	sig[1] = signal(SIGINT, SIG_IGN);
	152	sig[2] = signal(SIGQUIT, SIG_IGN);
	153	rv = sysfs_set_num(info, NULL, "suspend_lo", start * chunk_size * data_disks);
	154	rv \|= sysfs_set_num(info, NULL, "suspend_hi", (start + 1) * chunk_size * data_disks);
979afcb8	155	for (i = 0 ; i < raid_disks ; i++) {
af3c3750	156	lseek64(source[i], offsets[i] + start * chunk_size, 0);
979afcb8 PS	157	read(source[i], stripes[i], chunk_size);
979afcb8 PS	158	}
8d8ab389 PS	159	rv \|= sysfs_set_num(info, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
	160	rv \|= sysfs_set_num(info, NULL, "suspend_hi", 0);
	161	rv \|= sysfs_set_num(info, NULL, "suspend_lo", 0);
	162	signal(SIGQUIT, sig[2]);
	163	signal(SIGINT, sig[1]);
	164	signal(SIGTERM, sig[0]);
	165	if(munlockall() != 0) {
	166	err = 3;
	167	goto exitCheck;
	168	}
	169
	170	if(rv != 0) {
	171	err = rv * 256;
	172	goto exitCheck;
	173	}
	174
979afcb8	175	for (i = 0 ; i < data_disks ; i++) {
af3c3750	176	int disk = geo_map(i, start, raid_disks, level, layout);
979afcb8 PS	177	blocks[i] = stripes[disk];
	178	printf("%d->%d\n", i, disk);
	179	}
	180
	181	qsyndrome(p, q, (uint8_t**)blocks, data_disks, chunk_size);
af3c3750	182	diskP = geo_map(-1, start, raid_disks, level, layout);
979afcb8	183	if (memcmp(p, stripes[diskP], chunk_size) != 0) {
af3c3750	184	printf("P(%d) wrong at %llu\n", diskP, start);
979afcb8	185	}
af3c3750	186	diskQ = geo_map(-2, start, raid_disks, level, layout);
979afcb8	187	if (memcmp(q, stripes[diskQ], chunk_size) != 0) {
af3c3750	188	printf("Q(%d) wrong at %llu\n", diskQ, start);
979afcb8	189	}
af3c3750	190	raid6_collect(chunk_size, p, q, stripes[diskP], stripes[diskQ], results);
979afcb8 PS	191	disk = raid6_stats(results, raid_disks, chunk_size);
	192
	193	if(disk >= -2) {
af3c3750	194	disk = geo_map(disk, start, raid_disks, level, layout);
979afcb8 PS	195	}
979afcb8 PS	196	if(disk >= 0) {
af3c3750 PS	197	printf("Error detected at %llu: possible failed disk slot: %d --> %s\n",
af3c3750 PS	198	start, disk, name[disk]);
979afcb8 PS	199	}
979afcb8 PS	200	if(disk == -65535) {
af3c3750	201	printf("Error detected at %llu: disk slot unknown\n", start);
979afcb8 PS	202	}
979afcb8 PS	203
af3c3750 PS	204	length--;
af3c3750 PS	205	start++;
979afcb8 PS	206	}
979afcb8 PS	207
af3c3750 PS	208	exitCheck:
af3c3750 PS	209
979afcb8 PS	210	free(stripe_buf);
	211	free(stripes);
	212	free(blocks);
	213	free(p);
	214	free(q);
	215	free(results);
	216
af3c3750	217	return err;
979afcb8 PS	218	}
	219
	220	unsigned long long getnum(char str, char *err)
	221	{
	222	char *e;
	223	unsigned long long rv = strtoull(str, &e, 10);
	224	if (e==str \|\| *e) {
	225	*err = str;
	226	return 0;
	227	}
	228	return rv;
	229	}
	230
	231	int main(int argc, char *argv[])
	232	{
a9c2c6c6	233	/* md_device start length */
af3c3750 PS	234	int *fds = NULL;
	235	char *buf = NULL;
	236	char **disk_name = NULL;
	237	unsigned long long *offsets = NULL;
	238	int raid_disks = 0;
2cf31121	239	int active_disks;
af3c3750 PS	240	int chunk_size = 0;
af3c3750 PS	241	int layout = -1;
979afcb8 PS	242	int level = 6;
	243	unsigned long long start, length;
	244	int i;
a9c2c6c6	245	int mdfd;
8d8ab389	246	struct mdinfo info = NULL, comp = NULL;
979afcb8	247	char *err = NULL;
af3c3750 PS	248	int exit_err = 0;
	249	int close_flag = 0;
	250	char *prg = strrchr(argv[0], '/');
	251
	252	if (prg == NULL)
	253	prg = argv[0];
	254	else
	255	prg++;
	256
	257	if (argc < 4) {
	258	fprintf(stderr, "Usage: %s md_device start_stripe length_stripes\n", prg);
	259	exit_err = 1;
	260	goto exitHere;
979afcb8 PS	261	}
979afcb8 PS	262
a9c2c6c6 PS	263	mdfd = open(argv[1], O_RDONLY);
	264	if(mdfd < 0) {
	265	perror(argv[1]);
	266	fprintf(stderr,"%s: cannot open %s\n", prg, argv[1]);
af3c3750 PS	267	exit_err = 2;
af3c3750 PS	268	goto exitHere;
a9c2c6c6 PS	269	}
	270
	271	info = sysfs_read(mdfd, -1,
	272	GET_LEVEL\|
	273	GET_LAYOUT\|
	274	GET_DISKS\|
2cf31121	275	GET_DEGRADED \|
a9c2c6c6 PS	276	GET_COMPONENT\|
	277	GET_CHUNK\|
	278	GET_DEVS\|
	279	GET_OFFSET\|
	280	GET_SIZE);
	281
8d8ab389 PS	282	if(info == NULL) {
	283	fprintf(stderr, "%s: Error reading sysfs information of %s\n", prg, argv[1]);
	284	exit_err = 9;
	285	goto exitHere;
	286	}
	287
a9c2c6c6 PS	288	if(info->array.level != level) {
a9c2c6c6 PS	289	fprintf(stderr, "%s: %s not a RAID-6\n", prg, argv[1]);
af3c3750 PS	290	exit_err = 3;
af3c3750 PS	291	goto exitHere;
a9c2c6c6 PS	292	}
a9c2c6c6 PS	293
2cf31121 PS	294	if(info->array.failed_disks > 0) {
	295	fprintf(stderr, "%s: %s degraded array\n", prg, argv[1]);
	296	exit_err = 8;
	297	goto exitHere;
	298	}
	299
a9c2c6c6 PS	300	printf("layout: %d\n", info->array.layout);
a9c2c6c6 PS	301	printf("disks: %d\n", info->array.raid_disks);
af3c3750 PS	302	printf("component size: %llu\n", info->component_size * 512);
af3c3750 PS	303	printf("total stripes: %llu\n", (info->component_size * 512) / info->array.chunk_size);
a9c2c6c6 PS	304	printf("chunk size: %d\n", info->array.chunk_size);
	305	printf("\n");
	306
	307	comp = info->devs;
2cf31121	308	for(i = 0, active_disks = 0; active_disks < info->array.raid_disks; i++) {
a9c2c6c6	309	printf("disk: %d - offset: %llu - size: %llu - name: %s - slot: %d\n",
af3c3750	310	i, comp->data_offset * 512, comp->component_size * 512,
a9c2c6c6 PS	311	map_dev(comp->disk.major, comp->disk.minor, 0),
a9c2c6c6 PS	312	comp->disk.raid_disk);
2cf31121 PS	313	if(comp->disk.raid_disk >= 0)
2cf31121 PS	314	active_disks++;
a9c2c6c6 PS	315	comp = comp->next;
	316	}
	317	printf("\n");
	318
	319	close(mdfd);
	320
	321	raid_disks = info->array.raid_disks;
	322	chunk_size = info->array.chunk_size;
	323	layout = info->array.layout;
	324	start = getnum(argv[2], &err);
	325	length = getnum(argv[3], &err);
	326
979afcb8	327	if (err) {
a9c2c6c6	328	fprintf(stderr, "%s: Bad number: %s\n", prg, err);
af3c3750 PS	329	exit_err = 4;
af3c3750 PS	330	goto exitHere;
979afcb8	331	}
a9c2c6c6	332
af3c3750 PS	333	if(start > ((info->component_size * 512) / chunk_size)) {
	334	start = (info->component_size * 512) / chunk_size;
	335	fprintf(stderr, "%s: start beyond disks size\n", prg);
	336	}
a9c2c6c6	337
af3c3750 PS	338	if((length == 0) \|\|
	339	((length + start) > ((info->component_size * 512) / chunk_size))) {
	340	length = (info->component_size * 512) / chunk_size - start;
979afcb8	341	}
a9c2c6c6 PS	342
a9c2c6c6 PS	343	disk_name = malloc(raid_disks * sizeof(*disk_name));
979afcb8 PS	344	fds = malloc(raid_disks * sizeof(*fds));
979afcb8 PS	345	offsets = malloc(raid_disks * sizeof(*offsets));
af3c3750 PS	346	buf = malloc(raid_disks * chunk_size);
	347
	348	if((disk_name == NULL) \|\|
	349	(fds == NULL) \|\|
	350	(offsets == NULL) \|\|
	351	(buf == NULL)) {
	352	fprintf(stderr, "%s: allocation fail\n", prg);
	353	exit_err = 5;
	354	goto exitHere;
	355	}
	356
979afcb8	357	memset(offsets, 0, raid_disks * sizeof(*offsets));
af3c3750 PS	358	for(i=0; i<raid_disks; i++) {
	359	fds[i] = -1;
	360	}
	361	close_flag = 1;
979afcb8	362
a9c2c6c6	363	comp = info->devs;
2cf31121	364	for (i=0, active_disks=0; active_disks<raid_disks; i++) {
a9c2c6c6	365	int disk_slot = comp->disk.raid_disk;
2cf31121 PS	366	if(disk_slot >= 0) {
	367	disk_name[disk_slot] = map_dev(comp->disk.major, comp->disk.minor, 0);
	368	offsets[disk_slot] = comp->data_offset * 512;
	369	fds[disk_slot] = open(disk_name[disk_slot], O_RDWR);
	370	if (fds[disk_slot] < 0) {
	371	perror(disk_name[disk_slot]);
	372	fprintf(stderr,"%s: cannot open %s\n", prg, disk_name[disk_slot]);
	373	exit_err = 6;
	374	goto exitHere;
	375	}
	376	active_disks++;
979afcb8	377	}
a9c2c6c6	378	comp = comp->next;
979afcb8 PS	379	}
979afcb8 PS	380
8d8ab389	381	int rv = check_stripes(info, fds, offsets,
979afcb8	382	raid_disks, chunk_size, level, layout,
a9c2c6c6	383	start, length, disk_name);
979afcb8 PS	384	if (rv != 0) {
979afcb8 PS	385	fprintf(stderr,
a9c2c6c6	386	"%s: check_stripes returned %d\n", prg, rv);
af3c3750 PS	387	exit_err = 7;
af3c3750 PS	388	goto exitHere;
979afcb8 PS	389	}
979afcb8 PS	390
af3c3750 PS	391	exitHere:
	392
	393	if (close_flag)
	394	for(i = 0; i < raid_disks; i++)
	395	close(fds[i]);
	396
a9c2c6c6	397	free(disk_name);
979afcb8 PS	398	free(fds);
	399	free(offsets);
	400	free(buf);
	401
af3c3750	402	exit(exit_err);
979afcb8	403	}