[thirdparty/mdadm.git] / Create.c

/*
 * mdadm - manage Linux "md" devices aka RAID arrays.
 *
 * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
 *
 *
 *    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: Neil Brown
 *    Email: <neilb@cse.unsw.edu.au>
 *    Paper: Neil Brown
 *           School of Computer Science and Engineering
 *           The University of New South Wales
 *           Sydney, 2052
 *           Australia
 */

#include "mdadm.h"
#include	"md_u.h"
#include	"md_p.h"

int Create(char *mddev, int mdfd,
	   int chunk, int level, int layout, unsigned long size, int raiddisks, int sparedisks,
	   int subdevs, mddev_dev_t devlist,
	   int runstop, int verbose, int force)
{
	/*
	 * Create a new raid array.
	 *
	 * First check that necessary details are available
	 * (i.e. level, raid-disks)
	 *
	 * Then check each disk to see what might be on it
	 * and report anything interesting.
	 *
	 * If anything looks odd, and runstop not set,
	 * abort.
	 *
	 * SET_ARRAY_INFO and ADD_NEW_DISK, and
	 * if runstop==run, or raiddisks diskswere used,
	 * RUN_ARRAY
	 */
	unsigned long long minsize=0, maxsize=0;
	char *mindisc = NULL;
	char *maxdisc = NULL;
	int dnum;
	mddev_dev_t dv;
	int fail=0, warn=0;
	struct stat stb;
	int first_missing = MD_SB_DISKS*2;
	int missing_disks = 0;
	int insert_point = MD_SB_DISKS*2; /* where to insert a missing drive */
	mddev_dev_t moved_disk = NULL; /* the disk that was moved out of the insert point */

	mdu_array_info_t array;
	

	if (md_get_version(mdfd) < 9000) {
		fprintf(stderr, Name ": Create requires md driver version 0.90.0 or later\n");
		return 1;
	}
	if (level == UnSet) {
		fprintf(stderr,
			Name ": a RAID level is needed to create an array.\n");
		return 1;
	}
	if (raiddisks < 1) {
		fprintf(stderr,
			Name ": a number of --raid-devices must be given to create an array\n");
		return 1;
	}
	if (raiddisks < 4 && level == 6) {
		fprintf(stderr,
			Name ": at least 4 raid-devices needed for level 6\n");
		return 1;
	}
	if (raiddisks > 256 && level == 6) {
		fprintf(stderr,
			Name ": no more than 256 raid-devices supported for level 6\n");
		return 1;
	}
	if (raiddisks < 2 && level >= 4) {
		fprintf(stderr,
			Name ": at least 2 raid-devices needed for level 4 or 5\n");
		return 1;
	}
	if (raiddisks+sparedisks > MD_SB_DISKS) {
		fprintf(stderr,
			Name ": too many devices requested: %d+%d > %d\n",
			raiddisks, sparedisks, MD_SB_DISKS);
		return 1;
	}
	if (subdevs > raiddisks+sparedisks) {
		fprintf(stderr, Name ": You have listed more devices (%d) than are in the array(%d)!\n", subdevs, raiddisks+sparedisks);
		return 1;
	}
	if (subdevs < raiddisks+sparedisks) {
		fprintf(stderr, Name ": You haven't given enough devices (real or missing) to create this array\n");
		return 1;
	}

	/* now set some defaults */
	if (layout == UnSet)
		switch(level) {
		default: /* no layout */
			layout = 0;
			break;
		case 10:
			layout = 0x102; /* near=2, far=1 */
			if (verbose)
				fprintf(stderr,
					Name ": layout defaults to n1\n");
			break;
		case 5:
		case 6:
			layout = map_name(r5layout, "default");
			if (verbose)
				fprintf(stderr,
					Name ": layout defaults to %s\n", map_num(r5layout, layout));
			break;
		case LEVEL_FAULTY:
			layout = map_name(faultylayout, "default");

			if (verbose)
				fprintf(stderr,
					Name ": layout defaults to %s\n", map_num(faultylayout, layout));
			break;
		}

	if (level == 10)
		/* check layout fits in array*/
		if ((layout&255) * ((layout>>8)&255) > raiddisks) {
			fprintf(stderr, Name ": that layout requires at least %d devices\n",
				(layout&255) * ((layout>>8)&255));
			return 1;
		}

	switch(level) {
	case 4:
	case 5:
	case 10:
	case 6:
	case 0:
	case -1: /* linear */
		if (chunk == 0) {
			chunk = 64;
			if (verbose)
				fprintf(stderr, Name ": chunk size defaults to 64K\n");
		}
		break;
	default: /* raid1, multipath */
		if (chunk) {
			chunk = 0;
			if (verbose)
				fprintf(stderr, Name ": chunk size ignored for this level\n");
		}
		break;
	}

	/* now look at the subdevs */
	array.active_disks = 0;
	array.working_disks = 0;
	dnum = 0;
	for (dv=devlist; dv; dv=dv->next, dnum++) {
		char *dname = dv->devname;
		unsigned long dsize;
		unsigned long long ldsize, freesize;
		int fd;
		if (strcasecmp(dname, "missing")==0) {
			if (first_missing > dnum)
				first_missing = dnum;
			missing_disks ++;
			continue;
		}
		array.working_disks++;
		if (dnum < raiddisks)
			array.active_disks++;
		fd = open(dname, O_RDONLY|O_EXCL, 0);
		if (fd <0 ) {
			fprintf(stderr, Name ": Cannot open %s: %s\n",
				dname, strerror(errno));
			fail=1;
			continue;
		}
#ifdef BLKGETSIZE64
		if (ioctl(fd, BLKGETSIZE64, &ldsize)==0)
			;
		else
#endif
		if (ioctl(fd, BLKGETSIZE, &dsize)) {
			fprintf(stderr, Name ": Cannot get size of %s: %s\n",
				dname, strerror(errno));
			fail = 1;
			close(fd);
			continue;
		}
		else {
			ldsize = dsize;
			dsize <<= 9;
		}
		if (ldsize < MD_RESERVED_SECTORS*2LL*512LL) {
			fprintf(stderr, Name ": %s is too small: %luK\n",
				dname, (unsigned long)(ldsize>>10));
			fail = 1;
			close(fd);
			continue;
		}
		freesize = MD_NEW_SIZE_SECTORS((ldsize>>9));
		freesize /= 2;

		if (size && freesize < size) {
			fprintf(stderr, Name ": %s is smaller that given size."
				" %lluK < %luK + superblock\n", dname, freesize, size);
			fail = 1;
			close(fd);
			continue;
		}
		if (maxdisc == NULL || (maxdisc && freesize > maxsize)) {
			maxdisc = dname;
			maxsize = freesize;
		}
		if (mindisc ==NULL || (mindisc && freesize < minsize)) {
			mindisc = dname;
			minsize = freesize;
		}
		warn |= check_ext2(fd, dname);
		warn |= check_reiser(fd, dname);
		warn |= check_raid(fd, dname);
		close(fd);
	}
	if (fail) {
		fprintf(stderr, Name ": create aborted\n");
		return 1;
	}
	if (size == 0) {
		if (mindisc == NULL) {
			fprintf(stderr, Name ": no size and no drives given - aborting create.\n");
			return 1;
		}
		if (level > 0) {
			/* size is meaningful */
			if (minsize > 0x100000000ULL) {
				fprintf(stderr, Name ": devices too large for RAID level %d\n", level);	
				return 1;
			}
			size = minsize;
			if (verbose)
				fprintf(stderr, Name ": size set to %luK\n", size);
		}
	}
	if (level > 0 && ((maxsize-size)*100 > maxsize)) {
		fprintf(stderr, Name ": largest drive (%s) exceed size (%luK) by more than 1%%\n",
			maxdisc, size);
		warn = 1;
	}

	if (warn) {
		if (runstop!= 1) {
			if (!ask("Continue creating array? ")) {
				fprintf(stderr, Name ": create aborted.\n");
				return 1;
			}
		} else {
			if (verbose)
				fprintf(stderr, Name ": creation continuing despite oddities due to --run\n");
		}
	}

	/* If this is  raid5, we want to configure the last active slot
	 * as missing, so that a reconstruct happens (faster than re-parity)
	 * FIX: Can we do this for raid6 as well?
	 */
	if (force == 0 && first_missing >= raiddisks) {
		switch ( level ) {
		case 5:
			insert_point = raiddisks-1;
			sparedisks++;
			array.active_disks--;
			missing_disks++;
			break;
		default:
			break;
		}
	}
	
	/* Ok, lets try some ioctls */

	array.level = level;
	array.size = size;
	array.raid_disks = raiddisks;
	/* The kernel should *know* what md_minor we are dealing
	 * with, but it chooses to trust me instead. Sigh
	 */
	array.md_minor = 0;
	if (fstat(mdfd, &stb)==0)
		array.md_minor = minor(stb.st_rdev);
	array.not_persistent = 0;
	/*** FIX: Need to do something about RAID-6 here ***/
	if ( ( (level == 5) &&
	       (insert_point < raiddisks || first_missing < raiddisks) )
	     ||
	     ( level == 6 && missing_disks == 2)
		)
		array.state = 1; /* clean, but one+ drive will be missing */
	else
		array.state = 0; /* not clean, but no errors */

	/* There is lots of redundancy in these disk counts,
	 * raid_disks is the most meaningful value
	 *          it describes the geometry of the array
	 *          it is constant
	 * nr_disks is total number of used slots.
	 *          it should be raid_disks+spare_disks
	 * spare_disks is the number of extra disks present
	 *          see above
	 * active_disks is the number of working disks in
	 *          active slots. (With raid_disks)
	 * working_disks is the total number of working disks,
	 *          including spares
	 * failed_disks is the number of disks marked failed
	 *
         * Ideally, the kernel would keep these (except raid_disks)
	 * up-to-date as we ADD_NEW_DISK, but it doesn't (yet).
	 * So for now, we assume that all raid and spare
	 * devices will be given.
	 */
	array.spare_disks=sparedisks;
	array.failed_disks=missing_disks;
	array.nr_disks = array.working_disks + array.failed_disks;
	array.layout = layout;
	array.chunk_size = chunk*1024;

	if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
		fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
			mddev, strerror(errno));
		return 1;
	}
	
	for (dnum=0, dv = devlist ; dv ; dv=(dv->next)?(dv->next):moved_disk, dnum++) {
		int fd;
		struct stat stb;
		mdu_disk_info_t disk;

		disk.number = dnum;
		if (dnum == insert_point) {
			moved_disk = dv;
		}
		disk.raid_disk = disk.number;
		if (disk.raid_disk < raiddisks)
			disk.state = 6; /* active and in sync */
		else
			disk.state = 0;
		if (dnum == insert_point ||
		    strcasecmp(dv->devname, "missing")==0) {
			disk.major = 0;
			disk.minor = 0;
			disk.state = 1; /* faulty */
		} else {
			fd = open(dv->devname, O_RDONLY|O_EXCL, 0);
			if (fd < 0) {
				fprintf(stderr, Name ": failed to open %s after earlier success - aborting\n",
					dv->devname);
				return 1;
			}
			fstat(fd, &stb);
			disk.major = major(stb.st_rdev);
			disk.minor = minor(stb.st_rdev);
			close(fd);
		}
		if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
			fprintf(stderr, Name ": ADD_NEW_DISK for %s failed: %s\n",
				dv->devname, strerror(errno));
			return 1;
		}
		if (dv == moved_disk && dnum != insert_point) break;
	}

	/* param is not actually used */
	if (runstop == 1 || subdevs >= raiddisks) {
		mdu_param_t param;
		if (ioctl(mdfd, RUN_ARRAY, &param)) {
			fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
				strerror(errno));
			Manage_runstop(mddev, mdfd, -1);
			return 1;
		}
		fprintf(stderr, Name ": array %s started.\n", mddev);
	} else {
		fprintf(stderr, Name ": not starting array - not enough devices.\n");
	}
	return 0;
}
Commit	Line	Data
64c4757e	1	/*
9a9dab36	2	* mdadm - manage Linux "md" devices aka RAID arrays.
64c4757e	3	*
cd29a5c8	4	* Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
64c4757e NB	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: Neil Brown
	22	* Email: <neilb@cse.unsw.edu.au>
	23	* Paper: Neil Brown
	24	* School of Computer Science and Engineering
	25	* The University of New South Wales
	26	* Sydney, 2052
	27	* Australia
	28	*/
	29
9a9dab36	30	#include "mdadm.h"
682c7051 NB	31	#include "md_u.h"
682c7051 NB	32	#include "md_p.h"
64c4757e NB	33
64c4757e NB	34	int Create(char *mddev, int mdfd,
aa88f531	35	int chunk, int level, int layout, unsigned long size, int raiddisks, int sparedisks,
cd29a5c8	36	int subdevs, mddev_dev_t devlist,
52826846	37	int runstop, int verbose, int force)
64c4757e	38	{
682c7051 NB	39	/*
	40	* Create a new raid array.
	41	*
	42	* First check that necessary details are available
	43	* (i.e. level, raid-disks)
	44	*
	45	* Then check each disk to see what might be on it
	46	* and report anything interesting.
	47	*
	48	* If anything looks odd, and runstop not set,
	49	* abort.
	50	*
	51	* SET_ARRAY_INFO and ADD_NEW_DISK, and
	52	* if runstop==run, or raiddisks diskswere used,
	53	* RUN_ARRAY
	54	*/
b5e64645	55	unsigned long long minsize=0, maxsize=0;
cd29a5c8 NB	56	char *mindisc = NULL;
cd29a5c8 NB	57	char *maxdisc = NULL;
c913b90e	58	int dnum;
cd29a5c8	59	mddev_dev_t dv;
682c7051	60	int fail=0, warn=0;
82b27616	61	struct stat stb;
52826846 NB	62	int first_missing = MD_SB_DISKS*2;
	63	int missing_disks = 0;
	64	int insert_point = MD_SB_DISKS2; / where to insert a missing drive */
2d465520	65	mddev_dev_t moved_disk = NULL; /* the disk that was moved out of the insert point */
682c7051 NB	66
682c7051 NB	67	mdu_array_info_t array;
682c7051 NB	68
	69
	70	if (md_get_version(mdfd) < 9000) {
dd0781e5	71	fprintf(stderr, Name ": Create requires md driver version 0.90.0 or later\n");
52826846	72	return 1;
682c7051	73	}
98c6faba	74	if (level == UnSet) {
682c7051 NB	75	fprintf(stderr,
	76	Name ": a RAID level is needed to create an array.\n");
	77	return 1;
	78	}
	79	if (raiddisks < 1) {
	80	fprintf(stderr,
b83d95f3	81	Name ": a number of --raid-devices must be given to create an array\n");
682c7051 NB	82	return 1;
682c7051 NB	83	}
98c6faba NB	84	if (raiddisks < 4 && level == 6) {
	85	fprintf(stderr,
	86	Name ": at least 4 raid-devices needed for level 6\n");
	87	return 1;
	88	}
	89	if (raiddisks > 256 && level == 6) {
	90	fprintf(stderr,
	91	Name ": no more than 256 raid-devices supported for level 6\n");
	92	return 1;
	93	}
52826846 NB	94	if (raiddisks < 2 && level >= 4) {
52826846 NB	95	fprintf(stderr,
98c6faba	96	Name ": at least 2 raid-devices needed for level 4 or 5\n");
52826846 NB	97	return 1;
52826846 NB	98	}
682c7051 NB	99	if (raiddisks+sparedisks > MD_SB_DISKS) {
682c7051 NB	100	fprintf(stderr,
b83d95f3	101	Name ": too many devices requested: %d+%d > %d\n",
682c7051 NB	102	raiddisks, sparedisks, MD_SB_DISKS);
	103	return 1;
	104	}
	105	if (subdevs > raiddisks+sparedisks) {
b83d95f3	106	fprintf(stderr, Name ": You have listed more devices (%d) than are in the array(%d)!\n", subdevs, raiddisks+sparedisks);
52826846	107	return 1;
682c7051	108	}
cd29a5c8	109	if (subdevs < raiddisks+sparedisks) {
52826846 NB	110	fprintf(stderr, Name ": You haven't given enough devices (real or missing) to create this array\n");
	111	return 1;
	112	}
	113
682c7051	114	/* now set some defaults */
98c6faba	115	if (layout == UnSet)
682c7051 NB	116	switch(level) {
	117	default: /* no layout */
	118	layout = 0;
	119	break;
e5329c37 NB	120	case 10:
	121	layout = 0x102; /* near=2, far=1 */
	122	if (verbose)
	123	fprintf(stderr,
	124	Name ": layout defaults to n1\n");
	125	break;
682c7051	126	case 5:
98c6faba	127	case 6:
682c7051 NB	128	layout = map_name(r5layout, "default");
	129	if (verbose)
	130	fprintf(stderr,
	131	Name ": layout defaults to %s\n", map_num(r5layout, layout));
	132	break;
b5e64645 NB	133	case LEVEL_FAULTY:
	134	layout = map_name(faultylayout, "default");
	135
	136	if (verbose)
	137	fprintf(stderr,
	138	Name ": layout defaults to %s\n", map_num(faultylayout, layout));
	139	break;
682c7051 NB	140	}
682c7051 NB	141
e5329c37 NB	142	if (level == 10)
	143	/* check layout fits in array*/
	144	if ((layout&255) * ((layout>>8)&255) > raiddisks) {
	145	fprintf(stderr, Name ": that layout requires at least %d devices\n",
	146	(layout&255) * ((layout>>8)&255));
	147	return 1;
	148	}
	149
aa88f531 NB	150	switch(level) {
	151	case 4:
	152	case 5:
e5329c37	153	case 10:
98c6faba	154	case 6:
aa88f531 NB	155	case 0:
	156	case -1: /* linear */
	157	if (chunk == 0) {
	158	chunk = 64;
	159	if (verbose)
	160	fprintf(stderr, Name ": chunk size defaults to 64K\n");
	161	}
	162	break;
	163	default: /* raid1, multipath */
	164	if (chunk) {
	165	chunk = 0;
	166	if (verbose)
	167	fprintf(stderr, Name ": chunk size ignored for this level\n");
	168	}
	169	break;
682c7051 NB	170	}
	171
	172	/* now look at the subdevs */
52826846 NB	173	array.active_disks = 0;
52826846 NB	174	array.working_disks = 0;
c913b90e NB	175	dnum = 0;
c913b90e NB	176	for (dv=devlist; dv; dv=dv->next, dnum++) {
cd29a5c8	177	char *dname = dv->devname;
b5e64645 NB	178	unsigned long dsize;
b5e64645 NB	179	unsigned long long ldsize, freesize;
52826846	180	int fd;
cd29a5c8	181	if (strcasecmp(dname, "missing")==0) {
c913b90e NB	182	if (first_missing > dnum)
c913b90e NB	183	first_missing = dnum;
52826846 NB	184	missing_disks ++;
	185	continue;
	186	}
	187	array.working_disks++;
c913b90e	188	if (dnum < raiddisks)
52826846	189	array.active_disks++;
d7eaf49f	190	fd = open(dname, O_RDONLY\|O_EXCL, 0);
682c7051 NB	191	if (fd <0 ) {
	192	fprintf(stderr, Name ": Cannot open %s: %s\n",
	193	dname, strerror(errno));
	194	fail=1;
	195	continue;
	196	}
b5e64645 NB	197	#ifdef BLKGETSIZE64
	198	if (ioctl(fd, BLKGETSIZE64, &ldsize)==0)
	199	;
	200	else
	201	#endif
682c7051 NB	202	if (ioctl(fd, BLKGETSIZE, &dsize)) {
	203	fprintf(stderr, Name ": Cannot get size of %s: %s\n",
	204	dname, strerror(errno));
	205	fail = 1;
	206	close(fd);
	207	continue;
	208	}
b5e64645 NB	209	else {
	210	ldsize = dsize;
	211	dsize <<= 9;
	212	}
	213	if (ldsize < MD_RESERVED_SECTORS2LL512LL) {
aa88f531	214	fprintf(stderr, Name ": %s is too small: %luK\n",
b5e64645	215	dname, (unsigned long)(ldsize>>10));
52826846 NB	216	fail = 1;
	217	close(fd);
	218	continue;
682c7051	219	}
b5e64645	220	freesize = MD_NEW_SIZE_SECTORS((ldsize>>9));
682c7051 NB	221	freesize /= 2;
	222
	223	if (size && freesize < size) {
52826846	224	fprintf(stderr, Name ": %s is smaller that given size."
b5e64645	225	" %lluK < %luK + superblock\n", dname, freesize, size);
52826846 NB	226	fail = 1;
	227	close(fd);
	228	continue;
682c7051	229	}
cd29a5c8 NB	230	if (maxdisc == NULL \|\| (maxdisc && freesize > maxsize)) {
cd29a5c8 NB	231	maxdisc = dname;
52826846	232	maxsize = freesize;
682c7051	233	}
cd29a5c8 NB	234	if (mindisc ==NULL \|\| (mindisc && freesize < minsize)) {
cd29a5c8 NB	235	mindisc = dname;
52826846	236	minsize = freesize;
682c7051 NB	237	}
	238	warn \|= check_ext2(fd, dname);
	239	warn \|= check_reiser(fd, dname);
	240	warn \|= check_raid(fd, dname);
	241	close(fd);
	242	}
	243	if (fail) {
52826846 NB	244	fprintf(stderr, Name ": create aborted\n");
52826846 NB	245	return 1;
682c7051 NB	246	}
682c7051 NB	247	if (size == 0) {
cd29a5c8	248	if (mindisc == NULL) {
52826846 NB	249	fprintf(stderr, Name ": no size and no drives given - aborting create.\n");
	250	return 1;
	251	}
b5e64645 NB	252	if (level > 0) {
	253	/* size is meaningful */
	254	if (minsize > 0x100000000ULL) {
	255	fprintf(stderr, Name ": devices too large for RAID level %d\n", level);
	256	return 1;
	257	}
	258	size = minsize;
	259	if (verbose)
	260	fprintf(stderr, Name ": size set to %luK\n", size);
	261	}
682c7051	262	}
b5e64645	263	if (level > 0 && ((maxsize-size)*100 > maxsize)) {
aa88f531	264	fprintf(stderr, Name ": largest drive (%s) exceed size (%luK) by more than 1%%\n",
cd29a5c8	265	maxdisc, size);
52826846	266	warn = 1;
682c7051 NB	267	}
	268
	269	if (warn) {
52826846 NB	270	if (runstop!= 1) {
	271	if (!ask("Continue creating array? ")) {
	272	fprintf(stderr, Name ": create aborted.\n");
	273	return 1;
	274	}
	275	} else {
	276	if (verbose)
	277	fprintf(stderr, Name ": creation continuing despite oddities due to --run\n");
682c7051	278	}
682c7051 NB	279	}
682c7051 NB	280
52826846 NB	281	/* If this is raid5, we want to configure the last active slot
52826846 NB	282	* as missing, so that a reconstruct happens (faster than re-parity)
98c6faba	283	* FIX: Can we do this for raid6 as well?
52826846	284	*/
98c6faba NB	285	if (force == 0 && first_missing >= raiddisks) {
	286	switch ( level ) {
	287	case 5:
	288	insert_point = raiddisks-1;
	289	sparedisks++;
	290	array.active_disks--;
	291	missing_disks++;
	292	break;
	293	default:
	294	break;
	295	}
52826846 NB	296	}
52826846 NB	297
682c7051 NB	298	/* Ok, lets try some ioctls */
	299
	300	array.level = level;
	301	array.size = size;
682c7051	302	array.raid_disks = raiddisks;
82b27616 NB	303	/* The kernel should know what md_minor we are dealing
	304	* with, but it chooses to trust me instead. Sigh
	305	*/
682c7051	306	array.md_minor = 0;
82b27616	307	if (fstat(mdfd, &stb)==0)
0df46c2a	308	array.md_minor = minor(stb.st_rdev);
682c7051	309	array.not_persistent = 0;
98c6faba	310	/* FIX: Need to do something about RAID-6 here */
b5e64645 NB	311	if ( ( (level == 5) &&
	312	(insert_point < raiddisks \|\| first_missing < raiddisks) )
	313	\|\|
	314	( level == 6 && missing_disks == 2)
	315	)
98c6faba	316	array.state = 1; /* clean, but one+ drive will be missing */
82b27616	317	else
52826846	318	array.state = 0; /* not clean, but no errors */
82b27616 NB	319
	320	/* There is lots of redundancy in these disk counts,
	321	* raid_disks is the most meaningful value
	322	* it describes the geometry of the array
	323	* it is constant
	324	* nr_disks is total number of used slots.
	325	* it should be raid_disks+spare_disks
	326	* spare_disks is the number of extra disks present
	327	* see above
	328	* active_disks is the number of working disks in
	329	* active slots. (With raid_disks)
	330	* working_disks is the total number of working disks,
	331	* including spares
	332	* failed_disks is the number of disks marked failed
	333	*
	334	* Ideally, the kernel would keep these (except raid_disks)
	335	* up-to-date as we ADD_NEW_DISK, but it doesn't (yet).
	336	* So for now, we assume that all raid and spare
	337	* devices will be given.
	338	*/
52826846 NB	339	array.spare_disks=sparedisks;
	340	array.failed_disks=missing_disks;
	341	array.nr_disks = array.working_disks + array.failed_disks;
682c7051 NB	342	array.layout = layout;
	343	array.chunk_size = chunk*1024;
	344
	345	if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
52826846 NB	346	fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
	347	mddev, strerror(errno));
	348	return 1;
682c7051 NB	349	}
682c7051 NB	350
2d465520	351	for (dnum=0, dv = devlist ; dv ; dv=(dv->next)?(dv->next):moved_disk, dnum++) {
52826846 NB	352	int fd;
	353	struct stat stb;
	354	mdu_disk_info_t disk;
	355
c913b90e	356	disk.number = dnum;
2d465520 NB	357	if (dnum == insert_point) {
	358	moved_disk = dv;
	359	}
52826846 NB	360	disk.raid_disk = disk.number;
	361	if (disk.raid_disk < raiddisks)
	362	disk.state = 6; /* active and in sync */
	363	else
	364	disk.state = 0;
2d465520 NB	365	if (dnum == insert_point \|\|
2d465520 NB	366	strcasecmp(dv->devname, "missing")==0) {
52826846 NB	367	disk.major = 0;
	368	disk.minor = 0;
	369	disk.state = 1; /* faulty */
	370	} else {
d7eaf49f	371	fd = open(dv->devname, O_RDONLY\|O_EXCL, 0);
52826846 NB	372	if (fd < 0) {
52826846 NB	373	fprintf(stderr, Name ": failed to open %s after earlier success - aborting\n",
cd29a5c8	374	dv->devname);
52826846 NB	375	return 1;
	376	}
	377	fstat(fd, &stb);
0df46c2a NB	378	disk.major = major(stb.st_rdev);
0df46c2a NB	379	disk.minor = minor(stb.st_rdev);
52826846 NB	380	close(fd);
	381	}
	382	if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
	383	fprintf(stderr, Name ": ADD_NEW_DISK for %s failed: %s\n",
cd29a5c8	384	dv->devname, strerror(errno));
52826846 NB	385	return 1;
52826846 NB	386	}
2d465520	387	if (dv == moved_disk && dnum != insert_point) break;
5e52ae9e NB	388	}
5e52ae9e NB	389
682c7051 NB	390	/* param is not actually used */
682c7051 NB	391	if (runstop == 1 \|\| subdevs >= raiddisks) {
82b27616	392	mdu_param_t param;
682c7051 NB	393	if (ioctl(mdfd, RUN_ARRAY, &param)) {
	394	fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
	395	strerror(errno));
dd0781e5	396	Manage_runstop(mddev, mdfd, -1);
682c7051 NB	397	return 1;
	398	}
	399	fprintf(stderr, Name ": array %s started.\n", mddev);
	400	} else {
b83d95f3	401	fprintf(stderr, Name ": not starting array - not enough devices.\n");
682c7051 NB	402	}
682c7051 NB	403	return 0;
64c4757e	404	}