[thirdparty/mdadm.git] / Incremental.c

/*
 * Incremental.c - support --incremental.  Part of:
 * mdadm - manage Linux "md" devices aka RAID arrays.
 *
 * Copyright (C) 2006 Neil Brown <neilb@suse.de>
 *
 *
 *    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@suse.de>
 *    Paper: Neil Brown
 *           Novell Inc
 *           GPO Box Q1283
 *           QVB Post Office, NSW 1230
 *           Australia
 */

#include	"mdadm.h"

static int count_active(struct supertype *st, int mdfd, char **availp,
			struct mdinfo *info);
static void find_reject(int mdfd, struct supertype *st, struct sysarray *sra,
			int number, __u64 events, int verbose,
			char *array_name);

int Incremental(char *devname, int verbose, int runstop,
		struct supertype *st, char *homehost, int autof)
{
	/* Add this device to an array, creating the array if necessary
	 * and starting the array if sensibe or - if runstop>0 - if possible.
	 *
	 * This has several steps:
	 *
	 * 1/ Check if device is permitted by mdadm.conf, reject if not.
	 * 2/ Find metadata, reject if none appropriate (check
	 *       version/name from args)
	 * 3/ Check if there is a match in mdadm.conf
	 * 3a/ if not, check for homehost match.  If no match, reject.
	 * 4/ Determine device number.
	 * - If in mdadm.conf with std name, use that
	 * - UUID in /var/run/mdadm.map  use that
	 * - If name is suggestive, use that. unless in use with different uuid.
	 * - Choose a free, high number.
	 * - Use a partitioned device unless strong suggestion not to.
	 *         e.g. auto=md
	 * 5/ Find out if array already exists
	 * 5a/ if it does not
	 * - choose a name, from mdadm.conf or 'name' field in array.
	 * - create the array
	 * - add the device
	 * 5b/ if it does
	 * - check one drive in array to make sure metadata is a reasonably
	 *       close match.  Reject if not (e.g. different type)
	 * - add the device
	 * 6/ Make sure /var/run/mdadm.map contains this array.
	 * 7/ Is there enough devices to possibly start the array?
	 * 7a/ if not, finish with success.
	 * 7b/ if yes,
	 * - read all metadata and arrange devices like -A does
	 * - if number of OK devices match expected, or -R and there are enough,
	 *   start the array (auto-readonly).
	 */
	struct stat stb;
	struct mdinfo info, info2;
	struct mddev_ident_s *array_list, *match;
	char chosen_name[1024];
	int rv;
	int devnum;
	struct map_ent *mp, *map = NULL;
	int dfd, mdfd;
	char *avail;
	int active_disks;


	struct createinfo *ci = conf_get_create_info();

	if (autof == 0)
		autof = ci->autof;

	/* 1/ Check if devices is permitted by mdadm.conf */

	if (!conf_test_dev(devname)) {
		if (verbose >= 0)
			fprintf(stderr, Name
				": %s not permitted by mdadm.conf.\n",
				devname);
		return 1;
	}

	/* 2/ Find metadata, reject if none appropriate (check
	 *            version/name from args) */

	dfd = dev_open(devname, O_RDONLY|O_EXCL);
	if (dfd < 0) {
		if (verbose >= 0)
			fprintf(stderr, Name ": cannot open %s: %s.\n",
				devname, strerror(errno));
		return 1;
	}
	if (fstat(dfd, &stb) < 0) {
		if (verbose >= 0)
			fprintf(stderr, Name ": fstat failed for %s: %s.\n",
				devname, strerror(errno));
		close(dfd);
		return 1;
	}
	if ((stb.st_mode & S_IFMT) != S_IFBLK) {
		if (verbose >= 0)
			fprintf(stderr, Name ": %s is not a block device.\n",
				devname);
		close(dfd);
		return 1;
	}

	if (st == NULL && (st = guess_super(dfd)) == NULL) {
		if (verbose >= 0)
			fprintf(stderr, Name
				": no recognisable superblock on %s.\n",
				devname);
		close(dfd);
		return 1;
	}
	if (st->ss->load_super(st, dfd, NULL)) {
		if (verbose >= 0)
			fprintf(stderr, Name ": no RAID superblock on %s.\n",
				devname);
		close(dfd);
		return 1;
	}
	st->ss->getinfo_super(st, &info);
	close (dfd);

	/* 3/ Check if there is a match in mdadm.conf */

	array_list = conf_get_ident(NULL);
	match = NULL;
	for (; array_list; array_list = array_list->next) {
		if (array_list->uuid_set &&
		    same_uuid(array_list->uuid, info.uuid, st->ss->swapuuid)
		    == 0) {
			if (verbose >= 2)
				fprintf(stderr, Name
					": UUID differs from %s.\n",
					array_list->devname);
			continue;
		}
		if (array_list->name[0] &&
		    strcasecmp(array_list->name, info.name) != 0) {
			if (verbose >= 2)
				fprintf(stderr, Name
					": Name differs from %s.\n",
					array_list->devname);
			continue;
		}
		if (array_list->devices &&
		    !match_oneof(array_list->devices, devname)) {
			if (verbose >= 2)
				fprintf(stderr, Name
					": Not a listed device for %s.\n",
					array_list->devname);
			continue;
		}
		if (array_list->super_minor != UnSet &&
		    array_list->super_minor != info.array.md_minor) {
			if (verbose >= 2)
				fprintf(stderr, Name
					": Different super-minor to %s.\n",
					array_list->devname);
			continue;
		}
		if (!array_list->uuid_set &&
		    !array_list->name[0] &&
		    !array_list->devices &&
		    array_list->super_minor == UnSet) {
			if (verbose  >= 2)
				fprintf(stderr, Name
			     ": %s doesn't have any identifying information.\n",
					array_list->devname);
			continue;
		}
		/* FIXME, should I check raid_disks and level too?? */

		if (match) {
			if (verbose >= 0)
				fprintf(stderr, Name
		   ": we match both %s and %s - cannot decide which to use.\n",
					match->devname, array_list->devname);
			return 2;
		}
		match = array_list;
	}

	/* 3a/ if not, check for homehost match.  If no match, reject. */
	if (!match) {
		if (homehost == NULL ||
		    st->ss->match_home(st, homehost) == 0) {
			if (verbose >= 0)
				fprintf(stderr, Name
	      ": not found in mdadm.conf and not identified by homehost.\n");
			return 2;
		}
	}
	/* 4/ Determine device number. */
	/* - If in mdadm.conf with std name, use that */
	/* - UUID in /var/run/mdadm.map  use that */
	/* - If name is suggestive, use that. unless in use with */
	/*           different uuid. */
	/* - Choose a free, high number. */
	/* - Use a partitioned device unless strong suggestion not to. */
	/*         e.g. auto=md */
	if (match && is_standard(match->devname, &devnum))
		/* We have devnum now */;
	else if ((mp = map_by_uuid(&map, info.uuid)) != NULL)
		devnum = mp->devnum;
	else {
		/* Have to guess a bit. */
		int use_partitions = 1;
		char *np, *ep;
		if ((autof&7) == 3 || (autof&7) == 5)
			use_partitions = 0;
		np = strchr(info.name, ':');
		if (np)
			np++;
		else
			np = info.name;
		devnum = strtoul(np, &ep, 10);
		if (ep > np && *ep == 0) {
			/* This is a number.  Let check that it is unused. */
			if (mddev_busy(use_partitions ? (-1-devnum) : devnum))
				devnum = -1;
		} else
			devnum = -1;

		if (devnum < 0) {
			/* Haven't found anything yet, choose something free */
			/* There is similar code in mdopen.c - should unify */
			for (devnum = 127 ; devnum != 128 ;
			     devnum = devnum ? devnum-1 : (1<<22)-1) {
				if (mddev_busy(use_partitions ?
					       (-1-devnum) : devnum))
					break;
			}
			if (devnum == 128) {
				fprintf(stderr, Name
					": No spare md devices!!\n");
				return 2;
			}
		}
		devnum = use_partitions ? (-1-devnum) : devnum;
	}
	mdfd = open_mddev_devnum(match ? match->devname : NULL,
				 devnum,
				 info.name,
				 chosen_name);
	if (mdfd < 0) {
		fprintf(stderr, Name ": failed to open %s: %s.\n",
			chosen_name, strerror(errno));
		return 2;
	}
	/* 5/ Find out if array already exists */
	if (! mddev_busy(devnum)) {
	/* 5a/ if it does not */
	/* - choose a name, from mdadm.conf or 'name' field in array. */
	/* - create the array */
	/* - add the device */
		mdu_array_info_t ainf;
		mdu_disk_info_t disk;
		char md[20];
		struct sysarray *sra;

		memset(&ainf, 0, sizeof(ainf));
		ainf.major_version = st->ss->major;
		ainf.minor_version = st->minor_version;
		if (ioctl(mdfd, SET_ARRAY_INFO, &ainf) != 0) {
			fprintf(stderr, Name
				": SET_ARRAY_INFO failed for %s: %s\b",
				chosen_name, strerror(errno));
			close(mdfd);
			return 2;
		}
		sprintf(md, "%d.%d\n", st->ss->major, st->minor_version);
		sra = sysfs_read(mdfd, devnum, GET_VERSION);
		sysfs_set_str(sra, NULL, "metadata_version", md);
		memset(&disk, 0, sizeof(disk));
		disk.major = major(stb.st_rdev);
		disk.minor = minor(stb.st_rdev);
		sysfs_free(sra);
		if (ioctl(mdfd, ADD_NEW_DISK, &disk) != 0) {
			fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
				devname, chosen_name, strerror(errno));
			ioctl(mdfd, STOP_ARRAY, 0);
			close(mdfd);
			return 2;
		}
		sra = sysfs_read(mdfd, devnum, GET_DEVS);
		if (!sra || !sra->devs || sra->devs->role >= 0) {
			/* It really should be 'none' - must be old buggy
			 * kernel, and mdadm -I may not be able to complete.
			 * So reject it.
			 */
			ioctl(mdfd, STOP_ARRAY, NULL);
			fprintf(stderr, Name
		      ": You have an old buggy kernel which cannot support\n"
				"      --incremental reliably.  Aborting.\n");
			close(mdfd);
			sysfs_free(sra);
			return 2;
		}
	} else {
	/* 5b/ if it does */
	/* - check one drive in array to make sure metadata is a reasonably */
	/*        close match.  Reject if not (e.g. different type) */
	/* - add the device */
		char dn[20];
		int dfd2;
		mdu_disk_info_t disk;
		int err;
		struct sysarray *sra;
		struct supertype *st2;
		sra = sysfs_read(mdfd, devnum, (GET_VERSION | GET_DEVS |
						GET_STATE));
		if (sra->major_version != st->ss->major ||
		    sra->minor_version != st->minor_version) {
			if (verbose >= 0)
				fprintf(stderr, Name
	      ": %s has different metadata to chosen array %s %d.%d %d.%d.\n",
					devname, chosen_name,
					sra->major_version, sra->minor_version,
					st->ss->major, st->minor_version);
			close(mdfd);
			return 1;
		}
		sprintf(dn, "%d:%d", sra->devs->major, sra->devs->minor);
		dfd2 = dev_open(dn, O_RDONLY);
		st2 = dup_super(st);
		if (st2->ss->load_super(st2, dfd2, NULL)) {
			fprintf(stderr, Name
				": Strange error loading metadata for %s.\n",
				chosen_name);
			close(mdfd);
			close(dfd2);
			return 2;
		}
		close(dfd2);
		st2->ss->getinfo_super(st2, &info2);
		st2->ss->free_super(st2);
		if (info.array.level != info2.array.level ||
		    memcmp(info.uuid, info2.uuid, 16) != 0 ||
		    info.array.raid_disks != info2.array.raid_disks) {
			fprintf(stderr, Name
				": unexpected difference between %s and %s.\n",
				chosen_name, devname);
			close(mdfd);
			return 2;
		}
		memset(&disk, 0, sizeof(disk));
		disk.major = major(stb.st_rdev);
		disk.minor = minor(stb.st_rdev);
		err = ioctl(mdfd, ADD_NEW_DISK, &disk);
		if (err < 0 && errno == EBUSY) {
			/* could be another device present with the same
			 * disk.number. Find and reject any such
			 */
			find_reject(mdfd, st, sra, info.disk.number,
				    info.events, verbose, chosen_name);
			err = ioctl(mdfd, ADD_NEW_DISK, &disk);
		}
		if (err < 0) {
			fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
				devname, chosen_name, strerror(errno));
			close(mdfd);
			return 2;
		}
	}
	/* 6/ Make sure /var/run/mdadm.map contains this array. */
	map_update(&map, devnum,
		   info.array.major_version,
		   info.array.minor_version,
		   info.uuid, chosen_name);

	/* 7/ Is there enough devices to possibly start the array? */
	/* 7a/ if not, finish with success. */
	avail = NULL;
	active_disks = count_active(st, mdfd, &avail, &info);
	if (enough(info.array.level, info.array.raid_disks,
		   info.array.layout, info.array.state & 1,
		   avail, active_disks) == 0) {
		free(avail);
		if (verbose >= 0)
			fprintf(stderr, Name
			     ": %s attached to %s, not enough to start (%d).\n",
				devname, chosen_name, active_disks);
		close(mdfd);
		return 0;
	}
	free(avail);

	/* 7b/ if yes, */
	/* - if number of OK devices match expected, or -R and there */
	/*             are enough, */
	/*   + add any bitmap file  */
	/*   + start the array (auto-readonly). */
{
	mdu_array_info_t ainf;

	if (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0) {
		if (verbose >= 0)
			fprintf(stderr, Name
			   ": %s attached to %s which is already active.\n",
				devname, chosen_name);
		close (mdfd);
		return 0;
	}
}
	if (runstop > 0 || active_disks >= info.array.working_disks) {
		struct sysarray *sra;
		/* Let's try to start it */
		if (match && match->bitmap_file) {
			int bmfd = open(match->bitmap_file, O_RDWR);
			if (bmfd < 0) {
				fprintf(stderr, Name
					": Could not open bitmap file %s.\n",
					match->bitmap_file);
				close(mdfd);
				return 1;
			}
			if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
				close(bmfd);
				fprintf(stderr, Name
					": Failed to set bitmapfile for %s.\n",
					chosen_name);
				close(mdfd);
				return 1;
			}
			close(bmfd);
		}
		sra = sysfs_read(mdfd, devnum, 0);
		if (sra == NULL || active_disks >= info.array.working_disks)
			rv = ioctl(mdfd, RUN_ARRAY, NULL);
		else
			rv = sysfs_set_str(sra, NULL,
					   "array_state", "read-auto");
		if (rv == 0) {
			if (verbose >= 0)
				fprintf(stderr, Name
			   ": %s attached to %s, which has been started.\n",
					devname, chosen_name);
			rv = 0;
		} else {
			fprintf(stderr, Name
                             ": %s attached to %s, but failed to start: %s.\n",
				devname, chosen_name, strerror(errno));
			rv = 1;
		}
	} else {
		if (verbose >= 0)
			fprintf(stderr, Name
                          ": %s attached to %s, not enough to start safely.\n",
				devname, chosen_name);
		rv = 0;
	}
	close(mdfd);
	return rv;
}

static void find_reject(int mdfd, struct supertype *st, struct sysarray *sra,
			int number, __u64 events, int verbose,
			char *array_name)
{
	/* Find a device attached to this array with a disk.number of number
	 * and events less than the passed events, and remove the device.
	 */
	struct sysdev *d;
	mdu_array_info_t ra;

	if (ioctl(mdfd, GET_ARRAY_INFO, &ra) == 0)
		return; /* not safe to remove from active arrays
			 * without thinking more */

	for (d = sra->devs; d ; d = d->next) {
		char dn[10];
		int dfd;
		struct mdinfo info;
		sprintf(dn, "%d:%d", d->major, d->minor);
		dfd = dev_open(dn, O_RDONLY);
		if (dfd < 0)
			continue;
		if (st->ss->load_super(st, dfd, NULL)) {
			close(dfd);
			continue;
		}
		st->ss->getinfo_super(st, &info);
		st->ss->free_super(st);
		close(dfd);

		if (info.disk.number != number ||
		    info.events >= events)
			continue;

		if (d->role > -1)
			sysfs_set_str(sra, d, "slot", "none");
		if (sysfs_set_str(sra, d, "state", "remove") == 0)
			if (verbose >= 0)
				fprintf(stderr, Name
					": removing old device %s from %s\n",
					d->name+4, array_name);
	}
}

static int count_active(struct supertype *st, int mdfd, char **availp,
			struct mdinfo *bestinfo)
{
	/* count how many devices in sra think they are active */
	struct sysdev *d;
	int cnt = 0, cnt1 = 0;
	__u64 max_events = 0;
	struct sysarray *sra = sysfs_read(mdfd, -1, GET_DEVS | GET_STATE);
	char *avail = NULL;

	for (d = sra->devs ; d ; d = d->next) {
		char dn[30];
		int dfd;
		int ok;
		struct mdinfo info;

		sprintf(dn, "%d:%d", d->major, d->minor);
		dfd = dev_open(dn, O_RDONLY);
		if (dfd < 0)
			continue;
		ok =  st->ss->load_super(st, dfd, NULL);
		close(dfd);
		if (ok != 0)
			continue;
		st->ss->getinfo_super(st, &info);
		if (info.disk.state & (1<<MD_DISK_SYNC))
		{
			if (avail == NULL) {
				avail = malloc(info.array.raid_disks);
				memset(avail, 0, info.array.raid_disks);
			}
			if (cnt == 0) {
				cnt++;
				max_events = info.events;
				avail[info.disk.raid_disk] = 2;
				st->ss->getinfo_super(st, bestinfo);
			} else if (info.events == max_events) {
				cnt++;
				avail[info.disk.raid_disk] = 2;
			} else if (info.events == max_events-1) {
				cnt1++;
				avail[info.disk.raid_disk] = 1;
			} else if (info.events < max_events - 1)
				;
			else if (info.events == max_events+1) {
				int i;
				cnt1 = cnt;
				cnt = 1;
				max_events = info.events;
				for (i=0; i<info.array.raid_disks; i++)
					if (avail[i])
						avail[i]--;
				avail[info.disk.raid_disk] = 2;
				st->ss->getinfo_super(st, bestinfo);
			} else { /* info.events much bigger */
				cnt = 1; cnt1 = 0;
				memset(avail, 0, info.disk.raid_disk);
				max_events = info.events;
				st->ss->getinfo_super(st, bestinfo);
			}
		}
		st->ss->free_super(st);
	}
	return cnt + cnt1;
}

void RebuildMap(void)
{
	struct mdstat_ent *mdstat = mdstat_read(0, 0);
	struct mdstat_ent *md;
	struct map_ent *map = NULL;
	int mdp = get_mdp_major();

	for (md = mdstat ; md ; md = md->next) {
		struct sysarray *sra = sysfs_read(-1, md->devnum, GET_DEVS);
		struct sysdev *sd;

		for (sd = sra->devs ; sd ; sd = sd->next) {
			char dn[30];
			int dfd;
			int ok;
			struct supertype *st;
			char *path;
			struct mdinfo info;

			sprintf(dn, "%d:%d", sd->major, sd->minor);
			dfd = dev_open(dn, O_RDONLY);
			if (dfd < 0)
				continue;
			st = guess_super(dfd);
			if ( st == NULL)
				ok = -1;
			else
				ok = st->ss->load_super(st, dfd, NULL);
			close(dfd);
			if (ok != 0)
				continue;
			st->ss->getinfo_super(st, &info);
			if (md->devnum > 0)
				path = map_dev(MD_MAJOR, md->devnum, 0);
			else
				path = map_dev(mdp, (-1-md->devnum)<< 6, 0);
			map_add(&map, md->devnum, st->ss->major,
				st->minor_version,
				info.uuid, path ? : "/unknown");
			st->ss->free_super(st);
			break;
		}
	}
	map_write(map);
	map_free(map);
}

int IncrementalScan(int verbose)
{
	/* look at every device listed in the 'map' file.
	 * If one is found that is not running then:
	 *  look in mdadm.conf for bitmap file.
	 *   if one exists, but array has none, add it.
	 *  try to start array in auto-readonly mode
	 */
	struct map_ent *mapl = NULL;
	struct map_ent *me;
	mddev_ident_t devs, mddev;
	int rv = 0;

	map_read(&mapl);
	devs = conf_get_ident(NULL);

	for (me = mapl ; me ; me = me->next) {
		char path[1024];
		mdu_array_info_t array;
		mdu_bitmap_file_t bmf;
		struct sysarray *sra;
		int mdfd = open_mddev_devnum(me->path, me->devnum, NULL, path);
		if (mdfd < 0)
			continue;
		if (ioctl(mdfd, GET_ARRAY_INFO, &array) == 0 ||
		    errno != ENODEV) {
			close(mdfd);
			continue;
		}
		/* Ok, we can try this one.   Maybe it needs a bitmap */
		for (mddev = devs ; mddev ; mddev = mddev->next)
			if (strcmp(mddev->devname, me->path) == 0)
				break;
		if (mddev && mddev->bitmap_file) {
			/*
			 * Note: early kernels will wrongly fail this, so it
			 * is a hint only
			 */
			int added = -1;
			if (ioctl(mdfd, GET_ARRAY_INFO, &bmf) < 0) {
				int bmfd = open(mddev->bitmap_file, O_RDWR);
				if (bmfd >= 0) {
					added = ioctl(mdfd, SET_BITMAP_FILE,
						      bmfd);
					close(bmfd);
				}
			}
			if (verbose >= 0) {
				if (added == 0)
					fprintf(stderr, Name
						": Added bitmap %s to %s\n",
						mddev->bitmap_file, me->path);
				else if (errno != EEXIST)
					fprintf(stderr, Name
					   ": Failed to add bitmap to %s: %s\n",
						me->path, strerror(errno));
			}
		}
		sra = sysfs_read(mdfd, 0, 0);
		if (sra) {
			if (sysfs_set_str(sra, NULL,
					  "array_state", "read-auto") == 0) {
				if (verbose >= 0)
					fprintf(stderr, Name
						": started array %s\n",
						me->path);
			} else {
				fprintf(stderr, Name
					": failed to start array %s: %s\n",
					me->path, strerror(errno));
				rv = 1;
			}
		}
	}
	return rv;
}
Commit	Line	Data
8382f19b NB	1	/*
	2	* Incremental.c - support --incremental. Part of:
	3	* mdadm - manage Linux "md" devices aka RAID arrays.
	4	*
	5	* Copyright (C) 2006 Neil Brown <neilb@suse.de>
	6	*
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*
	22	* Author: Neil Brown
	23	* Email: <neilb@suse.de>
	24	* Paper: Neil Brown
	25	* Novell Inc
	26	* GPO Box Q1283
	27	* QVB Post Office, NSW 1230
	28	* Australia
	29	*/
	30
	31	#include "mdadm.h"
	32
	33	static int count_active(struct supertype st, int mdfd, char *availp,
	34	struct mdinfo *info);
	35	static void find_reject(int mdfd, struct supertype st, struct sysarray sra,
	36	int number, __u64 events, int verbose,
	37	char *array_name);
	38
	39	int Incremental(char *devname, int verbose, int runstop,
	40	struct supertype st, char homehost, int autof)
	41	{
	42	/* Add this device to an array, creating the array if necessary
	43	* and starting the array if sensibe or - if runstop>0 - if possible.
	44	*
	45	* This has several steps:
	46	*
	47	* 1/ Check if device is permitted by mdadm.conf, reject if not.
	48	* 2/ Find metadata, reject if none appropriate (check
	49	* version/name from args)
	50	* 3/ Check if there is a match in mdadm.conf
	51	* 3a/ if not, check for homehost match. If no match, reject.
	52	* 4/ Determine device number.
	53	* - If in mdadm.conf with std name, use that
	54	* - UUID in /var/run/mdadm.map use that
	55	* - If name is suggestive, use that. unless in use with different uuid.
	56	* - Choose a free, high number.
	57	* - Use a partitioned device unless strong suggestion not to.
	58	* e.g. auto=md
	59	* 5/ Find out if array already exists
	60	* 5a/ if it does not
	61	* - choose a name, from mdadm.conf or 'name' field in array.
	62	* - create the array
	63	* - add the device
	64	* 5b/ if it does
65	* - check one drive in array to make sure metadata is a reasonably
66	* close match. Reject if not (e.g. different type)
67	* - add the device
68	* 6/ Make sure /var/run/mdadm.map contains this array.
69	* 7/ Is there enough devices to possibly start the array?
70	* 7a/ if not, finish with success.
71	* 7b/ if yes,
72	* - read all metadata and arrange devices like -A does
73	* - if number of OK devices match expected, or -R and there are enough,
74	* start the array (auto-readonly).
75	*/
76	struct stat stb;
8382f19b NB	77	struct mdinfo info, info2;
	78	struct mddev_ident_s array_list, match;
	79	char chosen_name[1024];
	80	int rv;
	81	int devnum;
	82	struct map_ent mp, map = NULL;
	83	int dfd, mdfd;
	84	char *avail;
	85	int active_disks;
	86
	87
	88	struct createinfo *ci = conf_get_create_info();
	89
	90	if (autof == 0)
	91	autof = ci->autof;
	92
	93	/* 1/ Check if devices is permitted by mdadm.conf */
	94
	95	if (!conf_test_dev(devname)) {
	96	if (verbose >= 0)
	97	fprintf(stderr, Name
	98	": %s not permitted by mdadm.conf.\n",
	99	devname);
	100	return 1;
	101	}
	102
	103	/* 2/ Find metadata, reject if none appropriate (check
	104	* version/name from args) */
	105
	106	dfd = dev_open(devname, O_RDONLY\|O_EXCL);
	107	if (dfd < 0) {
	108	if (verbose >= 0)
	109	fprintf(stderr, Name ": cannot open %s: %s.\n",
	110	devname, strerror(errno));
	111	return 1;
	112	}
	113	if (fstat(dfd, &stb) < 0) {
	114	if (verbose >= 0)
	115	fprintf(stderr, Name ": fstat failed for %s: %s.\n",
	116	devname, strerror(errno));
	117	close(dfd);
	118	return 1;
	119	}
	120	if ((stb.st_mode & S_IFMT) != S_IFBLK) {
	121	if (verbose >= 0)
	122	fprintf(stderr, Name ": %s is not a block device.\n",
	123	devname);
	124	close(dfd);
	125	return 1;
	126	}
	127
	128	if (st == NULL && (st = guess_super(dfd)) == NULL) {
	129	if (verbose >= 0)
	130	fprintf(stderr, Name
	131	": no recognisable superblock on %s.\n",
	132	devname);
	133	close(dfd);
	134	return 1;
	135	}
3da92f27	136	if (st->ss->load_super(st, dfd, NULL)) {
8382f19b NB	137	if (verbose >= 0)
	138	fprintf(stderr, Name ": no RAID superblock on %s.\n",
	139	devname);
	140	close(dfd);
	141	return 1;
	142	}
3da92f27	143	st->ss->getinfo_super(st, &info);
8382f19b NB	144	close (dfd);
	145
	146	/* 3/ Check if there is a match in mdadm.conf */
	147
	148	array_list = conf_get_ident(NULL);
	149	match = NULL;
	150	for (; array_list; array_list = array_list->next) {
	151	if (array_list->uuid_set &&
	152	same_uuid(array_list->uuid, info.uuid, st->ss->swapuuid)
	153	== 0) {
	154	if (verbose >= 2)
	155	fprintf(stderr, Name
	156	": UUID differs from %s.\n",
	157	array_list->devname);
	158	continue;
	159	}
	160	if (array_list->name[0] &&
	161	strcasecmp(array_list->name, info.name) != 0) {
	162	if (verbose >= 2)
	163	fprintf(stderr, Name
	164	": Name differs from %s.\n",
	165	array_list->devname);
	166	continue;
	167	}
	168	if (array_list->devices &&
	169	!match_oneof(array_list->devices, devname)) {
	170	if (verbose >= 2)
	171	fprintf(stderr, Name
	172	": Not a listed device for %s.\n",
	173	array_list->devname);
	174	continue;
	175	}
	176	if (array_list->super_minor != UnSet &&
	177	array_list->super_minor != info.array.md_minor) {
	178	if (verbose >= 2)
	179	fprintf(stderr, Name
	180	": Different super-minor to %s.\n",
	181	array_list->devname);
	182	continue;
	183	}
	184	if (!array_list->uuid_set &&
	185	!array_list->name[0] &&
	186	!array_list->devices &&
	187	array_list->super_minor == UnSet) {
	188	if (verbose >= 2)
	189	fprintf(stderr, Name
	190	": %s doesn't have any identifying information.\n",
	191	array_list->devname);
	192	continue;
	193	}
	194	/* FIXME, should I check raid_disks and level too?? */
	195
	196	if (match) {
	197	if (verbose >= 0)
	198	fprintf(stderr, Name
	199	": we match both %s and %s - cannot decide which to use.\n",
	200	match->devname, array_list->devname);
	201	return 2;
	202	}
	203	match = array_list;
	204	}
	205
	206	/* 3a/ if not, check for homehost match. If no match, reject. */
	207	if (!match) {
208	if (homehost == NULL \|\|
3da92f27	209	st->ss->match_home(st, homehost) == 0) {
8382f19b NB	210	if (verbose >= 0)
	211	fprintf(stderr, Name
	212	": not found in mdadm.conf and not identified by homehost.\n");
	213	return 2;
	214	}
	215	}
	216	/* 4/ Determine device number. */
	217	/* - If in mdadm.conf with std name, use that */
	218	/* - UUID in /var/run/mdadm.map use that */
	219	/* - If name is suggestive, use that. unless in use with */
	220	/* different uuid. */
	221	/* - Choose a free, high number. */
	222	/* - Use a partitioned device unless strong suggestion not to. */
	223	/* e.g. auto=md */
	224	if (match && is_standard(match->devname, &devnum))
	225	/* We have devnum now */;
	226	else if ((mp = map_by_uuid(&map, info.uuid)) != NULL)
	227	devnum = mp->devnum;
	228	else {
	229	/* Have to guess a bit. */
	230	int use_partitions = 1;
	231	char np, ep;
	232	if ((autof&7) == 3 \|\| (autof&7) == 5)
	233	use_partitions = 0;
	234	np = strchr(info.name, ':');
	235	if (np)
	236	np++;
	237	else
	238	np = info.name;
	239	devnum = strtoul(np, &ep, 10);
	240	if (ep > np && *ep == 0) {
	241	/* This is a number. Let check that it is unused. */
	242	if (mddev_busy(use_partitions ? (-1-devnum) : devnum))
	243	devnum = -1;
	244	} else
	245	devnum = -1;
	246
	247	if (devnum < 0) {
	248	/* Haven't found anything yet, choose something free */
	249	/* There is similar code in mdopen.c - should unify */
	250	for (devnum = 127 ; devnum != 128 ;
	251	devnum = devnum ? devnum-1 : (1<<22)-1) {
	252	if (mddev_busy(use_partitions ?
	253	(-1-devnum) : devnum))
	254	break;
	255	}
	256	if (devnum == 128) {
	257	fprintf(stderr, Name
	258	": No spare md devices!!\n");
	259	return 2;
	260	}
	261	}
	262	devnum = use_partitions ? (-1-devnum) : devnum;
	263	}
	264	mdfd = open_mddev_devnum(match ? match->devname : NULL,
	265	devnum,
	266	info.name,
	267	chosen_name);
	268	if (mdfd < 0) {
	269	fprintf(stderr, Name ": failed to open %s: %s.\n",
	270	chosen_name, strerror(errno));
	271	return 2;
	272	}
	273	/* 5/ Find out if array already exists */
274	if (! mddev_busy(devnum)) {
275	/* 5a/ if it does not */
276	/* - choose a name, from mdadm.conf or 'name' field in array. */
277	/* - create the array */
278	/* - add the device */
279	mdu_array_info_t ainf;
280	mdu_disk_info_t disk;
281	char md[20];
282	struct sysarray *sra;
283
284	memset(&ainf, 0, sizeof(ainf));
285	ainf.major_version = st->ss->major;
286	ainf.minor_version = st->minor_version;
287	if (ioctl(mdfd, SET_ARRAY_INFO, &ainf) != 0) {
288	fprintf(stderr, Name
289	": SET_ARRAY_INFO failed for %s: %s\b",
290	chosen_name, strerror(errno));
291	close(mdfd);
292	return 2;
293	}
294	sprintf(md, "%d.%d\n", st->ss->major, st->minor_version);
295	sra = sysfs_read(mdfd, devnum, GET_VERSION);
296	sysfs_set_str(sra, NULL, "metadata_version", md);
297	memset(&disk, 0, sizeof(disk));
298	disk.major = major(stb.st_rdev);
299	disk.minor = minor(stb.st_rdev);
300	sysfs_free(sra);
301	if (ioctl(mdfd, ADD_NEW_DISK, &disk) != 0) {
302	fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
303	devname, chosen_name, strerror(errno));
304	ioctl(mdfd, STOP_ARRAY, 0);
305	close(mdfd);
306	return 2;
307	}
308	sra = sysfs_read(mdfd, devnum, GET_DEVS);
309	if (!sra \|\| !sra->devs \|\| sra->devs->role >= 0) {
310	/* It really should be 'none' - must be old buggy
311	* kernel, and mdadm -I may not be able to complete.
312	* So reject it.
313	*/
314	ioctl(mdfd, STOP_ARRAY, NULL);
315	fprintf(stderr, Name
316	": You have an old buggy kernel which cannot support\n"
317	" --incremental reliably. Aborting.\n");
318	close(mdfd);
319	sysfs_free(sra);
320	return 2;
321	}
322	} else {
323	/* 5b/ if it does */
324	/* - check one drive in array to make sure metadata is a reasonably */
325	/* close match. Reject if not (e.g. different type) */
326	/* - add the device */
327	char dn[20];
328	int dfd2;
329	mdu_disk_info_t disk;
330	int err;
331	struct sysarray *sra;
3da92f27	332	struct supertype *st2;
8382f19b NB	333	sra = sysfs_read(mdfd, devnum, (GET_VERSION \| GET_DEVS \|
	334	GET_STATE));
	335	if (sra->major_version != st->ss->major \|\|
	336	sra->minor_version != st->minor_version) {
	337	if (verbose >= 0)
	338	fprintf(stderr, Name
	339	": %s has different metadata to chosen array %s %d.%d %d.%d.\n",
	340	devname, chosen_name,
	341	sra->major_version, sra->minor_version,
	342	st->ss->major, st->minor_version);
	343	close(mdfd);
	344	return 1;
	345	}
	346	sprintf(dn, "%d:%d", sra->devs->major, sra->devs->minor);
	347	dfd2 = dev_open(dn, O_RDONLY);
3da92f27 NB	348	st2 = dup_super(st);
3da92f27 NB	349	if (st2->ss->load_super(st2, dfd2, NULL)) {
8382f19b NB	350	fprintf(stderr, Name
	351	": Strange error loading metadata for %s.\n",
	352	chosen_name);
	353	close(mdfd);
	354	close(dfd2);
	355	return 2;
	356	}
	357	close(dfd2);
3da92f27 NB	358	st2->ss->getinfo_super(st2, &info2);
3da92f27 NB	359	st2->ss->free_super(st2);
8382f19b NB	360	if (info.array.level != info2.array.level \|\|
	361	memcmp(info.uuid, info2.uuid, 16) != 0 \|\|
	362	info.array.raid_disks != info2.array.raid_disks) {
	363	fprintf(stderr, Name
	364	": unexpected difference between %s and %s.\n",
	365	chosen_name, devname);
	366	close(mdfd);
	367	return 2;
	368	}
	369	memset(&disk, 0, sizeof(disk));
	370	disk.major = major(stb.st_rdev);
	371	disk.minor = minor(stb.st_rdev);
	372	err = ioctl(mdfd, ADD_NEW_DISK, &disk);
	373	if (err < 0 && errno == EBUSY) {
	374	/* could be another device present with the same
	375	* disk.number. Find and reject any such
	376	*/
	377	find_reject(mdfd, st, sra, info.disk.number,
	378	info.events, verbose, chosen_name);
	379	err = ioctl(mdfd, ADD_NEW_DISK, &disk);
	380	}
	381	if (err < 0) {
	382	fprintf(stderr, Name ": failed to add %s to %s: %s.\n",
	383	devname, chosen_name, strerror(errno));
	384	close(mdfd);
	385	return 2;
	386	}
	387	}
	388	/* 6/ Make sure /var/run/mdadm.map contains this array. */
	389	map_update(&map, devnum,
	390	info.array.major_version,
	391	info.array.minor_version,
	392	info.uuid, chosen_name);
	393
	394	/* 7/ Is there enough devices to possibly start the array? */
	395	/* 7a/ if not, finish with success. */
f8409e54	396	avail = NULL;
8382f19b NB	397	active_disks = count_active(st, mdfd, &avail, &info);
	398	if (enough(info.array.level, info.array.raid_disks,
	399	info.array.layout, info.array.state & 1,
	400	avail, active_disks) == 0) {
	401	free(avail);
	402	if (verbose >= 0)
	403	fprintf(stderr, Name
	404	": %s attached to %s, not enough to start (%d).\n",
	405	devname, chosen_name, active_disks);
	406	close(mdfd);
	407	return 0;
	408	}
	409	free(avail);
	410
	411	/* 7b/ if yes, */
	412	/* - if number of OK devices match expected, or -R and there */
	413	/* are enough, */
	414	/* + add any bitmap file */
	415	/* + start the array (auto-readonly). */
	416	{
	417	mdu_array_info_t ainf;
	418
	419	if (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0) {
	420	if (verbose >= 0)
	421	fprintf(stderr, Name
	422	": %s attached to %s which is already active.\n",
	423	devname, chosen_name);
	424	close (mdfd);
	425	return 0;
	426	}
	427	}
	428	if (runstop > 0 \|\| active_disks >= info.array.working_disks) {
	429	struct sysarray *sra;
	430	/* Let's try to start it */
	431	if (match && match->bitmap_file) {
	432	int bmfd = open(match->bitmap_file, O_RDWR);
	433	if (bmfd < 0) {
	434	fprintf(stderr, Name
	435	": Could not open bitmap file %s.\n",
	436	match->bitmap_file);
	437	close(mdfd);
	438	return 1;
	439	}
	440	if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
	441	close(bmfd);
	442	fprintf(stderr, Name
	443	": Failed to set bitmapfile for %s.\n",
	444	chosen_name);
	445	close(mdfd);
	446	return 1;
	447	}
	448	close(bmfd);
	449	}
	450	sra = sysfs_read(mdfd, devnum, 0);
	451	if (sra == NULL \|\| active_disks >= info.array.working_disks)
	452	rv = ioctl(mdfd, RUN_ARRAY, NULL);
	453	else
	454	rv = sysfs_set_str(sra, NULL,
	455	"array_state", "read-auto");
	456	if (rv == 0) {
	457	if (verbose >= 0)
	458	fprintf(stderr, Name
	459	": %s attached to %s, which has been started.\n",
	460	devname, chosen_name);
461	rv = 0;
462	} else {
463	fprintf(stderr, Name
464	": %s attached to %s, but failed to start: %s.\n",
465	devname, chosen_name, strerror(errno));
466	rv = 1;
467	}
468	} else {
469	if (verbose >= 0)
470	fprintf(stderr, Name
471	": %s attached to %s, not enough to start safely.\n",
472	devname, chosen_name);
473	rv = 0;
474	}
475	close(mdfd);
476	return rv;
477	}
478
479	static void find_reject(int mdfd, struct supertype st, struct sysarray sra,
480	int number, __u64 events, int verbose,
481	char *array_name)
482	{
3da92f27	483	/* Find a device attached to this array with a disk.number of number
8382f19b NB	484	* and events less than the passed events, and remove the device.
	485	*/
	486	struct sysdev *d;
	487	mdu_array_info_t ra;
	488
	489	if (ioctl(mdfd, GET_ARRAY_INFO, &ra) == 0)
	490	return; /* not safe to remove from active arrays
	491	* without thinking more */
	492
	493	for (d = sra->devs; d ; d = d->next) {
	494	char dn[10];
	495	int dfd;
8382f19b NB	496	struct mdinfo info;
	497	sprintf(dn, "%d:%d", d->major, d->minor);
	498	dfd = dev_open(dn, O_RDONLY);
	499	if (dfd < 0)
	500	continue;
3da92f27	501	if (st->ss->load_super(st, dfd, NULL)) {
8382f19b NB	502	close(dfd);
	503	continue;
	504	}
3da92f27 NB	505	st->ss->getinfo_super(st, &info);
3da92f27 NB	506	st->ss->free_super(st);
8382f19b NB	507	close(dfd);
	508
	509	if (info.disk.number != number \|\|
	510	info.events >= events)
	511	continue;
	512
	513	if (d->role > -1)
	514	sysfs_set_str(sra, d, "slot", "none");
	515	if (sysfs_set_str(sra, d, "state", "remove") == 0)
	516	if (verbose >= 0)
	517	fprintf(stderr, Name
	518	": removing old device %s from %s\n",
	519	d->name+4, array_name);
	520	}
	521	}
	522
	523	static int count_active(struct supertype st, int mdfd, char *availp,
	524	struct mdinfo *bestinfo)
	525	{
	526	/* count how many devices in sra think they are active */
	527	struct sysdev *d;
	528	int cnt = 0, cnt1 = 0;
	529	__u64 max_events = 0;
8382f19b NB	530	struct sysarray *sra = sysfs_read(mdfd, -1, GET_DEVS \| GET_STATE);
	531	char *avail = NULL;
	532
	533	for (d = sra->devs ; d ; d = d->next) {
	534	char dn[30];
	535	int dfd;
8382f19b NB	536	int ok;
	537	struct mdinfo info;
	538
	539	sprintf(dn, "%d:%d", d->major, d->minor);
	540	dfd = dev_open(dn, O_RDONLY);
	541	if (dfd < 0)
	542	continue;
3da92f27	543	ok = st->ss->load_super(st, dfd, NULL);
8382f19b NB	544	close(dfd);
	545	if (ok != 0)
	546	continue;
3da92f27	547	st->ss->getinfo_super(st, &info);
8382f19b NB	548	if (info.disk.state & (1<<MD_DISK_SYNC))
	549	{
	550	if (avail == NULL) {
	551	avail = malloc(info.array.raid_disks);
	552	memset(avail, 0, info.array.raid_disks);
	553	}
	554	if (cnt == 0) {
	555	cnt++;
	556	max_events = info.events;
	557	avail[info.disk.raid_disk] = 2;
3da92f27	558	st->ss->getinfo_super(st, bestinfo);
8382f19b NB	559	} else if (info.events == max_events) {
	560	cnt++;
	561	avail[info.disk.raid_disk] = 2;
	562	} else if (info.events == max_events-1) {
	563	cnt1++;
	564	avail[info.disk.raid_disk] = 1;
	565	} else if (info.events < max_events - 1)
	566	;
	567	else if (info.events == max_events+1) {
	568	int i;
	569	cnt1 = cnt;
	570	cnt = 1;
	571	max_events = info.events;
	572	for (i=0; i<info.array.raid_disks; i++)
	573	if (avail[i])
	574	avail[i]--;
	575	avail[info.disk.raid_disk] = 2;
3da92f27	576	st->ss->getinfo_super(st, bestinfo);
8382f19b NB	577	} else { /* info.events much bigger */
	578	cnt = 1; cnt1 = 0;
	579	memset(avail, 0, info.disk.raid_disk);
	580	max_events = info.events;
3da92f27	581	st->ss->getinfo_super(st, bestinfo);
8382f19b NB	582	}
8382f19b NB	583	}
3da92f27	584	st->ss->free_super(st);
8382f19b NB	585	}
	586	return cnt + cnt1;
	587	}
	588
	589	void RebuildMap(void)
	590	{
	591	struct mdstat_ent *mdstat = mdstat_read(0, 0);
	592	struct mdstat_ent *md;
	593	struct map_ent *map = NULL;
	594	int mdp = get_mdp_major();
	595
	596	for (md = mdstat ; md ; md = md->next) {
	597	struct sysarray *sra = sysfs_read(-1, md->devnum, GET_DEVS);
	598	struct sysdev *sd;
	599
	600	for (sd = sra->devs ; sd ; sd = sd->next) {
	601	char dn[30];
	602	int dfd;
	603	int ok;
	604	struct supertype *st;
	605	char *path;
8382f19b NB	606	struct mdinfo info;
	607
	608	sprintf(dn, "%d:%d", sd->major, sd->minor);
	609	dfd = dev_open(dn, O_RDONLY);
	610	if (dfd < 0)
	611	continue;
	612	st = guess_super(dfd);
	613	if ( st == NULL)
	614	ok = -1;
	615	else
3da92f27	616	ok = st->ss->load_super(st, dfd, NULL);
8382f19b NB	617	close(dfd);
	618	if (ok != 0)
	619	continue;
3da92f27	620	st->ss->getinfo_super(st, &info);
8382f19b NB	621	if (md->devnum > 0)
	622	path = map_dev(MD_MAJOR, md->devnum, 0);
	623	else
	624	path = map_dev(mdp, (-1-md->devnum)<< 6, 0);
	625	map_add(&map, md->devnum, st->ss->major,
	626	st->minor_version,
	627	info.uuid, path ? : "/unknown");
3da92f27	628	st->ss->free_super(st);
8382f19b NB	629	break;
	630	}
	631	}
	632	map_write(map);
	633	map_free(map);
	634	}
	635
	636	int IncrementalScan(int verbose)
	637	{
	638	/* look at every device listed in the 'map' file.
	639	* If one is found that is not running then:
	640	* look in mdadm.conf for bitmap file.
	641	* if one exists, but array has none, add it.
	642	* try to start array in auto-readonly mode
	643	*/
	644	struct map_ent *mapl = NULL;
	645	struct map_ent *me;
	646	mddev_ident_t devs, mddev;
	647	int rv = 0;
	648
	649	map_read(&mapl);
	650	devs = conf_get_ident(NULL);
	651
	652	for (me = mapl ; me ; me = me->next) {
	653	char path[1024];
	654	mdu_array_info_t array;
	655	mdu_bitmap_file_t bmf;
	656	struct sysarray *sra;
	657	int mdfd = open_mddev_devnum(me->path, me->devnum, NULL, path);
	658	if (mdfd < 0)
	659	continue;
	660	if (ioctl(mdfd, GET_ARRAY_INFO, &array) == 0 \|\|
	661	errno != ENODEV) {
	662	close(mdfd);
	663	continue;
	664	}
	665	/* Ok, we can try this one. Maybe it needs a bitmap */
	666	for (mddev = devs ; mddev ; mddev = mddev->next)
	667	if (strcmp(mddev->devname, me->path) == 0)
	668	break;
	669	if (mddev && mddev->bitmap_file) {
	670	/*
	671	* Note: early kernels will wrongly fail this, so it
	672	* is a hint only
	673	*/
	674	int added = -1;
	675	if (ioctl(mdfd, GET_ARRAY_INFO, &bmf) < 0) {
	676	int bmfd = open(mddev->bitmap_file, O_RDWR);
	677	if (bmfd >= 0) {
	678	added = ioctl(mdfd, SET_BITMAP_FILE,
	679	bmfd);
	680	close(bmfd);
	681	}
	682	}
	683	if (verbose >= 0) {
	684	if (added == 0)
	685	fprintf(stderr, Name
	686	": Added bitmap %s to %s\n",
	687	mddev->bitmap_file, me->path);
	688	else if (errno != EEXIST)
	689	fprintf(stderr, Name
	690	": Failed to add bitmap to %s: %s\n",
	691	me->path, strerror(errno));
	692	}
693	}
694	sra = sysfs_read(mdfd, 0, 0);
695	if (sra) {
696	if (sysfs_set_str(sra, NULL,
697	"array_state", "read-auto") == 0) {
698	if (verbose >= 0)
699	fprintf(stderr, Name
700	": started array %s\n",
701	me->path);
702	} else {
703	fprintf(stderr, Name
704	": failed to start array %s: %s\n",
705	me->path, strerror(errno));
706	rv = 1;
707	}
708	}
709	}
710	return rv;
711	}