[thirdparty/mdadm.git] / Assemble.c

/*
 * mdctl - manage Linux "md" devices aka RAID arrays.
 *
 * Copyright (C) 2001 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	"mdctl.h"
#include	"md_u.h"
#include	"md_p.h"

int Assemble(char *mddev, int mdfd,
	     mddev_ident_t ident, char *conffile,
	     int subdevs, char **subdev,
	     int readonly, int runstop,
	     int verbose, int force)
{
	/*
	 * The task of Assemble is to find a collection of
	 * devices that should (according to their superblocks)
	 * form an array, and to give this collection to the MD driver.
	 * In Linux-2.4 and later, this involves submitting a
	 * SET_ARRAY_INFO ioctl with no arg - to prepare
	 * the array - and then submit a number of
	 * ADD_NEW_DISK ioctls to add disks into
	 * the array.  Finally RUN_ARRAY might
	 * be submitted to start the array.
	 *
	 * Much of the work of Assemble is in finding and/or
	 * checking the disks to make sure they look right.
	 *
	 * If mddev is not set, then scan must be and we
	 *  read through the config file for dev+uuid mapping
	 *  We recurse, setting mddev, for each device that
	 *    - isn't running
	 *    - has a valid uuid (or any uuid if !uuidset
	 *
	 * If mddev is set, we try to determine state of md.
	 *   check version - must be at least 0.90.0
	 *   check kernel version.  must be at least 2.4.
	 *    If not, we can possibly fall back on START_ARRAY
	 *   Try to GET_ARRAY_INFO.
	 *     If possible, give up
	 *     If not, try to STOP_ARRAY just to make sure
	 *
	 * If !uuidset and scan, look in conf-file for uuid
	 *       If not found, give up
	 * If !subdevs and scan and uuidset, get list of devs from conf-file 
	 *
	 * For each device:
	 *   Check superblock - discard if bad
	 *   Check uuid (set if we don't have one) - discard if no match
	 *   Check superblock similarity if we have a superbloc - discard if different
	 *   Record events, devicenum, utime
	 * This should give us a list of devices for the array
	 * We should collect the most recent event and utime numbers
	 *
	 * Count disks with recent enough event count
	 * While force && !enough disks
	 *    Choose newest rejected disks, update event count
	 *     mark clean and rewrite superblock
	 * If recent kernel:
	 *    SET_ARRAY_INFO
	 *    foreach device with recent events : ADD_NEW_DISK
	 *    if runstop == 1 || "enough" disks and runstop==0 -> RUN_ARRAY
	 * If old kernel:
	 *    Check the device numbers in superblock are right
	 *    update superblock if any changes
	 *    START_ARRAY
	 *
	 */
	int old_linux = 0;
	int vers;
	mdu_array_info_t array;
	mddev_dev_t devlist = NULL;
	mdp_super_t first_super, super;
	struct {
		char *devname;
		int major, minor;
		long long events;
		time_t utime;
		int uptodate;
		int raid_disk;
	} devices[MD_SB_DISKS];
	int best[MD_SB_DISKS]; /* indexed by raid_disk */
	int devcnt = 0, okcnt, sparecnt;
	int i;
	int most_recent = 0;
	int chosen_drive = -1;
	int change = 0;
	
	vers = md_get_version(mdfd);
	if (vers <= 0) {
		fprintf(stderr, Name ": %s appears not to be an md device.\n");
		return 1;
	}
	if (vers < 9000) {
		fprintf(stderr, Name ": Assemble requires driver version 0.90.0 or later.\n"
			"    Upgrade your kernel or try --build\n");
		return 1;
	}
	if (get_linux_version() < 2004000)
		old_linux = 1;

	if (ioctl(mdfd, GET_ARRAY_INFO, &array)>=0) {
		fprintf(stderr, Name ": device %s already active - cannot assemble it\n",
			mddev);
		return 1;
	}
	ioctl(mdfd, STOP_ARRAY, NULL); /* just incase it was started but has no content */

	/*
	 * If any subdevs are listed, then any that don't
	 * match ident are discarded.  Remainder must all match and
	 * become the array.
	 * If no subdevs, then we scan all devices in the config file, but
	 * there must be something in the identity
	 */

	if (subdevs == 0 &&
	    ident->uuid_set == 0 &&
	    ident->super_minor < 0 &&
	    ident->devices == NULL) {
		fprintf(stderr, Name ": No identity information available for %s - cannot assemble.\n",
			mddev);
		return 1;
	}
	if (subdevs==0)
		devlist = conf_get_devs(conffile);

	first_super.md_magic = 0;
	for (i=0; i<MD_SB_DISKS; i++)
		best[i] = -1;

	if (verbose)
	    fprintf(stderr, Name ": looking for devices for %s\n",
		    mddev);

	while (subdevs || devlist) {
		char *devname;
		int this_uuid[4];
		int dfd;
		struct stat stb;
		int inargv;
		int havesuper=0;

		if (subdevs) {
			devname = *subdev++;
			subdevs--;
			inargv=1;
		} else {
			devname = devlist->devname;
			devlist = devlist->next;
			inargv=0;
		}

		if (ident->devices &&
		    !match_oneof(ident->devices, devname))
			continue;
		
		dfd = open(devname, O_RDONLY, 0);
		if (dfd < 0) {
			if (inargv || verbose)
				fprintf(stderr, Name ": cannot open device %s: %s\n",
					devname, strerror(errno));
		} else if (fstat(dfd, &stb)< 0) {
			/* Impossible! */
			fprintf(stderr, Name ": fstat failed for %s: %s\n",
				devname, strerror(errno));
			close(dfd);
		} if ((stb.st_mode & S_IFMT) != S_IFBLK) {
			fprintf(stderr, Name ": %d is not a block device.\n",
				devname);
			close(dfd);
		} if (load_super(dfd, &super)) {
			if (inargv || verbose)
				fprintf( stderr, Name ": no RAID superblock on %s\n",
					 devname);
			close(dfd);
		} else {
			havesuper =1;
			uuid_from_super(this_uuid, &super);
			close(dfd);
		}

		if (ident->uuid_set &&
		    (!havesuper || same_uuid(this_uuid, ident->uuid)==0)) {
			if (inargv || verbose)
				fprintf(stderr, Name ": %s has wrong uuid.\n",
					devname);
			continue;
		}
		if (ident->super_minor >= 0 &&
		    (!havesuper || ident->super_minor != super.md_minor)) {
			if (inargv || verbose)
				fprintf(stderr, Name ": %s has wrong super-minor.\n",
					devname);
			continue;
		}

		/* If we are this far, then we are commited to this device.
		 * If the super_block doesn't exist, or doesn't match others,
		 * then we cannot continue
		 */
		if (verbose)
			fprintf(stderr, Name ": %s is identified as a member of %s.\n",
				devname, mddev);

		if (!havesuper) {
			fprintf(stderr, Name ": %s has no superblock - assembly aborted\n",
				devname);
			return 1;
		}
		if (compare_super(&first_super, &super)) {
			fprintf(stderr, Name ": superblock on %s doesn't match others - assembly aborted\n",
				devname);
			return 1;
		}

		if (devcnt >= MD_SB_DISKS) {
		    fprintf(stderr, Name ": ouch - too many devices appear to be in this array. Ignoring %s\n",
			    devname);
		    continue;
		}
		devices[devcnt].devname = devname;
		devices[devcnt].major = MAJOR(stb.st_rdev);
		devices[devcnt].minor = MINOR(stb.st_rdev);
		devices[devcnt].events = md_event(&super);
		devices[devcnt].utime = super.utime;
		devices[devcnt].raid_disk = super.this_disk.raid_disk;
		devices[devcnt].uptodate = 0;
		if (most_recent < devcnt) {
			if (devices[devcnt].events
			    > devices[most_recent].events)
				most_recent = devcnt;
		}
		i = devices[devcnt].raid_disk;
		if (i>=0 && i < MD_SB_DISKS)
			if (best[i] == -1
			    || devices[best[i]].events < devices[devcnt].events)
				best[i] = devcnt;

		devcnt++;
	}

	if (devcnt == 0) {
		fprintf(stderr, Name ": no devices found for %s\n",
			mddev);
		return 1;
	}
	/* now we have some devices that might be suitable.
	 * I wonder how many
	 */
	okcnt = 0;
	sparecnt=0;
	for (i=0; i< MD_SB_DISKS;i++) {
		int j = best[i];
		if (j < 0) continue;
		if (devices[j].events+1 >=
		    devices[most_recent].events) {
			devices[j].uptodate = 1;
			if (i < first_super.raid_disks)
				okcnt++;
			else
				sparecnt++;
		}
	}
	while (force && !enough(first_super.level, first_super.raid_disks, okcnt)) {
		/* Choose the newest best drive which is
		 * not up-to-date, update the superblock
		 * and add it.
		 */
		int fd;
		for (i=0; i<first_super.raid_disks; i++) {
			int j = best[i];
			if (j>=0 &&
			    !devices[j].uptodate &&
			    devices[j].events > 0 &&
			    (chosen_drive < 0 ||
			     devices[j].events > devices[chosen_drive].events))
				chosen_drive = j;
		}
		if (chosen_drive < 0)
			break;
		fprintf(stderr, Name ": forcing event count in %s(%d) from %d upto %d\n",
			devices[chosen_drive].devname, devices[chosen_drive].raid_disk,
			(int)(devices[chosen_drive].events),
			(int)(devices[most_recent].events));
		fd = open(devices[chosen_drive].devname, O_RDWR);
		if (fd < 0) {
			fprintf(stderr, Name ": Couldn't open %s for write - not updating\n",
				devices[chosen_drive].devname);
			devices[chosen_drive].events = 0;
			continue;
		}
		if (load_super(fd, &super)) {
			close(fd);
			fprintf(stderr, Name ": RAID superblock disappeared from %s - not updating.\n",
				devices[chosen_drive].devname);
			devices[chosen_drive].events = 0;
			continue;
		}
		super.events_hi = (devices[most_recent].events>>32)&0xFFFFFFFF;
		super.events_lo = (devices[most_recent].events)&0xFFFFFFFF;
		super.sb_csum = calc_sb_csum(&super);
/*DRYRUN*/	if (store_super(fd, &super)) {
			close(fd);
			fprintf(stderr, Name ": Could not re-write superblock on %s\n",
				devices[chosen_drive].devname);
			devices[chosen_drive].events = 0;
			continue;
		}
		close(fd);
		devices[chosen_drive].events = devices[most_recent].events;
		devices[chosen_drive].uptodate = 1;
		okcnt++;
	}

	/* Now we want to look at the superblock which the kernel will base things on
	 * and compare the devices that we think are working with the devices that the
	 * superblock thinks are working.
	 * If there are differences and --force is given, then update this chosen
	 * superblock.
	 */
	for (i=0; chosen_drive < 0 && i<MD_SB_DISKS; i++) {
		int j = best[i];
		int fd;
		if (j<0)
			continue;
		if (!devices[j].uptodate)
			continue;
		chosen_drive = j;
		if ((fd=open(devices[j].devname, O_RDONLY))< 0) {
			fprintf(stderr, Name ": Cannot open %s: %s\n",
				devices[j].devname, strerror(errno));
			return 1;
		}
		if (load_super(fd, &super)) {
			close(fd);
			fprintf(stderr, Name ": RAID superblock has disappeared from %s\n",
				devices[j].devname);
			return 1;
		}
		close(fd);
	}

	for (i=0; i<MD_SB_DISKS; i++) {
		int j = best[i];
		if (j<0)
			continue;
		if (!devices[j].uptodate)
			continue;
		if (devices[j].major != super.disks[j].major ||
		    devices[j].minor != super.disks[j].minor) {
			change |= 1;
			super.disks[j].major = devices[j].major;
			super.disks[j].minor = devices[j].minor;
		}
		if (devices[j].uptodate &&
		    (super.disks[i].state & (1 << MD_DISK_FAULTY))) {
			if (force) {
				fprintf(stderr, Name ": "
					"clearing FAULT flag for device %d in %s for %s\n",
					j, mddev, devices[j].devname);
				super.disks[i].state &= ~(1<<MD_DISK_FAULTY);
				change |= 2;
			} else {
				fprintf(stderr, Name ": "
					"device %d in %s is marked faulty in superblock, but %s seems ok\n",
					i, mddev, devices[j].devname);
			}
		}
		if (!devices[j].uptodate &&
		    !(super.disks[i].state & (1 << MD_DISK_FAULTY))) {
			fprintf(stderr, Name ": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
				i, mddev);
		}
	}

	if ((force && (change & 2))
	    || (old_linux && (change & 1))) {
		int fd;
		super.sb_csum = calc_sb_csum(&super);
		fd = open(devices[chosen_drive].devname, O_RDWR);
		if (fd < 0) {
			fprintf(stderr, Name ": Could open %s for write - cannot Assemble array.\n",
				devices[chosen_drive].devname);
			return 1;
		}
		if (store_super(fd, &super)) {
			close(fd);
			fprintf(stderr, Name ": Could not re-write superblock on %s\n",
				devices[chosen_drive].devname);
			return 1;
		}
		close(fd);
		change = 0;
	}

	/* Almost ready to actually *do* something */
	if (!old_linux) {
		if (ioctl(mdfd, SET_ARRAY_INFO, NULL) != 0) {
			fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
				mddev, strerror(errno));
			return 1;
		}
		/* First, add the raid disks, but add the chosen one last */
		for (i=0; i<=MD_SB_DISKS; i++) {
			int j;
			if (i < MD_SB_DISKS) {
				j = best[i];
				if (j == chosen_drive)
					continue;
			} else
				j = chosen_drive;

			if (j >= 0 && devices[j].uptodate) {
				mdu_disk_info_t disk;
				memset(&disk, 0, sizeof(disk));
				disk.major = devices[j].major;
				disk.minor = devices[j].minor;
				if (ioctl(mdfd, ADD_NEW_DISK, &disk)!=0) {
					fprintf(stderr, Name ": failed to add %s to %s: %s\n",
						devices[j].devname,
						mddev,
						strerror(errno));
					if (i < first_super.raid_disks)
						okcnt--;
					else
						sparecnt--;
				} else if (verbose)
					fprintf(stderr, Name ": added %s to %s as %d\n",
						devices[j].devname, mddev, devices[j].raid_disk);
			} else if (verbose && i < first_super.raid_disks)
				fprintf(stderr, Name ": no uptodate device for slot %d of %s\n",
					i, mddev);
		}
		
		if (runstop == 1 ||
		    (runstop == 0 && 
		     enough(first_super.level, first_super.raid_disks, okcnt))) {
			if (ioctl(mdfd, RUN_ARRAY, NULL)==0) {
				fprintf(stderr, Name ": %s has been started with %d drive%s",
					mddev, okcnt, okcnt==1?"":"s");
				if (sparecnt)
					fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
				fprintf(stderr, ".\n");
				return 0;
			}
			fprintf(stderr, Name ": failed to RUN_ARRAY %s: %s\n",
				mddev, strerror(errno));
			return 1;
		}
		if (runstop == -1) {
			fprintf(stderr, Name ": %s assembled from %d drive%s, but not started.\n",
				mddev, okcnt, okcnt==1?"":"s");
			return 0;
		}
		fprintf(stderr, Name ": %s assembled from %d drive%s - not enough to start it.\n",
			mddev, okcnt, okcnt==1?"":"s");
		return 1;
	} else {
		/* The "chosen_drive" is a good choice, and if necessary, the superblock has
		 * been updated to point to the current locations of devices.
		 * so we can just start the array
		 */
		int dev;
		dev = MKDEV(devices[chosen_drive].major,
			    devices[chosen_drive].minor);
		if (ioctl(mdfd, START_ARRAY, dev)) {
		    fprintf(stderr, Name ": Cannot start array: %s\n",
			    strerror(errno));
		}
		
	}
}
Commit	Line	Data
64c4757e NB	1	/*
	2	* mdctl - manage Linux "md" devices aka RAID arrays.
	3	*
	4	* Copyright (C) 2001 Neil Brown <neilb@cse.unsw.edu.au>
	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
	30	#include "mdctl.h"
64c4757e	31	#include "md_u.h"
52826846	32	#include "md_p.h"
64c4757e NB	33
64c4757e NB	34	int Assemble(char *mddev, int mdfd,
52826846	35	mddev_ident_t ident, char *conffile,
64c4757e NB	36	int subdevs, char **subdev,
	37	int readonly, int runstop,
	38	int verbose, int force)
	39	{
	40	/*
52826846 NB	41	* The task of Assemble is to find a collection of
	42	* devices that should (according to their superblocks)
	43	* form an array, and to give this collection to the MD driver.
	44	* In Linux-2.4 and later, this involves submitting a
64c4757e NB	45	* SET_ARRAY_INFO ioctl with no arg - to prepare
	46	* the array - and then submit a number of
	47	* ADD_NEW_DISK ioctls to add disks into
	48	* the array. Finally RUN_ARRAY might
	49	* be submitted to start the array.
	50	*
	51	* Much of the work of Assemble is in finding and/or
	52	* checking the disks to make sure they look right.
	53	*
	54	* If mddev is not set, then scan must be and we
	55	* read through the config file for dev+uuid mapping
	56	* We recurse, setting mddev, for each device that
	57	* - isn't running
	58	* - has a valid uuid (or any uuid if !uuidset
	59	*
	60	* If mddev is set, we try to determine state of md.
	61	* check version - must be at least 0.90.0
	62	* check kernel version. must be at least 2.4.
	63	* If not, we can possibly fall back on START_ARRAY
	64	* Try to GET_ARRAY_INFO.
	65	* If possible, give up
	66	* If not, try to STOP_ARRAY just to make sure
	67	*
	68	* If !uuidset and scan, look in conf-file for uuid
	69	* If not found, give up
	70	* If !subdevs and scan and uuidset, get list of devs from conf-file
	71	*
	72	* For each device:
	73	* Check superblock - discard if bad
	74	* Check uuid (set if we don't have one) - discard if no match
	75	* Check superblock similarity if we have a superbloc - discard if different
	76	* Record events, devicenum, utime
	77	* This should give us a list of devices for the array
	78	* We should collect the most recent event and utime numbers
	79	*
	80	* Count disks with recent enough event count
	81	* While force && !enough disks
	82	* Choose newest rejected disks, update event count
	83	* mark clean and rewrite superblock
	84	* If recent kernel:
	85	* SET_ARRAY_INFO
	86	* foreach device with recent events : ADD_NEW_DISK
	87	* if runstop == 1 \|\| "enough" disks and runstop==0 -> RUN_ARRAY
	88	* If old kernel:
	89	* Check the device numbers in superblock are right
	90	* update superblock if any changes
	91	* START_ARRAY
	92	*
	93	*/
	94	int old_linux = 0;
	95	int vers;
	96	mdu_array_info_t array;
	97	mddev_dev_t devlist = NULL;
	98	mdp_super_t first_super, super;
	99	struct {
	100	char *devname;
	101	int major, minor;
	102	long long events;
	103	time_t utime;
	104	int uptodate;
52826846	105	int raid_disk;
64c4757e NB	106	} devices[MD_SB_DISKS];
64c4757e NB	107	int best[MD_SB_DISKS]; /* indexed by raid_disk */
52826846	108	int devcnt = 0, okcnt, sparecnt;
64c4757e NB	109	int i;
64c4757e NB	110	int most_recent = 0;
52826846 NB	111	int chosen_drive = -1;
52826846 NB	112	int change = 0;
64c4757e	113
64c4757e NB	114	vers = md_get_version(mdfd);
64c4757e NB	115	if (vers <= 0) {
682c7051	116	fprintf(stderr, Name ": %s appears not to be an md device.\n");
64c4757e NB	117	return 1;
64c4757e NB	118	}
682c7051 NB	119	if (vers < 9000) {
682c7051 NB	120	fprintf(stderr, Name ": Assemble requires driver version 0.90.0 or later.\n"
52826846	121	" Upgrade your kernel or try --build\n");
64c4757e NB	122	return 1;
64c4757e NB	123	}
682c7051	124	if (get_linux_version() < 2004000)
64c4757e NB	125	old_linux = 1;
	126
	127	if (ioctl(mdfd, GET_ARRAY_INFO, &array)>=0) {
682c7051	128	fprintf(stderr, Name ": device %s already active - cannot assemble it\n",
64c4757e NB	129	mddev);
	130	return 1;
	131	}
	132	ioctl(mdfd, STOP_ARRAY, NULL); /* just incase it was started but has no content */
	133
	134	/*
52826846 NB	135	* If any subdevs are listed, then any that don't
	136	* match ident are discarded. Remainder must all match and
	137	* become the array.
	138	* If no subdevs, then we scan all devices in the config file, but
	139	* there must be something in the identity
64c4757e	140	*/
64c4757e	141
52826846 NB	142	if (subdevs == 0 &&
	143	ident->uuid_set == 0 &&
	144	ident->super_minor < 0 &&
	145	ident->devices == NULL) {
	146	fprintf(stderr, Name ": No identity information available for %s - cannot assemble.\n",
	147	mddev);
	148	return 1;
64c4757e	149	}
52826846	150	if (subdevs==0)
64c4757e NB	151	devlist = conf_get_devs(conffile);
64c4757e NB	152
64c4757e NB	153	first_super.md_magic = 0;
	154	for (i=0; i<MD_SB_DISKS; i++)
	155	best[i] = -1;
	156
82b27616 NB	157	if (verbose)
	158	fprintf(stderr, Name ": looking for devices for %s\n",
	159	mddev);
	160
64c4757e NB	161	while (subdevs \|\| devlist) {
	162	char *devname;
	163	int this_uuid[4];
	164	int dfd;
	165	struct stat stb;
	166	int inargv;
52826846 NB	167	int havesuper=0;
52826846 NB	168
64c4757e NB	169	if (subdevs) {
	170	devname = *subdev++;
	171	subdevs--;
	172	inargv=1;
	173	} else {
	174	devname = devlist->devname;
	175	devlist = devlist->next;
	176	inargv=0;
	177	}
	178
52826846 NB	179	if (ident->devices &&
	180	!match_oneof(ident->devices, devname))
	181	continue;
	182
64c4757e NB	183	dfd = open(devname, O_RDONLY, 0);
	184	if (dfd < 0) {
	185	if (inargv \|\| verbose)
682c7051	186	fprintf(stderr, Name ": cannot open device %s: %s\n",
64c4757e	187	devname, strerror(errno));
52826846 NB	188	} else if (fstat(dfd, &stb)< 0) {
	189	/* Impossible! */
	190	fprintf(stderr, Name ": fstat failed for %s: %s\n",
	191	devname, strerror(errno));
	192	close(dfd);
	193	} if ((stb.st_mode & S_IFMT) != S_IFBLK) {
	194	fprintf(stderr, Name ": %d is not a block device.\n",
	195	devname);
	196	close(dfd);
	197	} if (load_super(dfd, &super)) {
64c4757e	198	if (inargv \|\| verbose)
682c7051	199	fprintf( stderr, Name ": no RAID superblock on %s\n",
64c4757e NB	200	devname);
64c4757e NB	201	close(dfd);
52826846 NB	202	} else {
	203	havesuper =1;
	204	uuid_from_super(this_uuid, &super);
	205	close(dfd);
64c4757e	206	}
52826846 NB	207
	208	if (ident->uuid_set &&
	209	(!havesuper \|\| same_uuid(this_uuid, ident->uuid)==0)) {
	210	if (inargv \|\| verbose)
	211	fprintf(stderr, Name ": %s has wrong uuid.\n",
	212	devname);
	213	continue;
82b27616	214	}
52826846 NB	215	if (ident->super_minor >= 0 &&
52826846 NB	216	(!havesuper \|\| ident->super_minor != super.md_minor)) {
64c4757e	217	if (inargv \|\| verbose)
52826846	218	fprintf(stderr, Name ": %s has wrong super-minor.\n",
64c4757e NB	219	devname);
	220	continue;
	221	}
52826846 NB	222
	223	/* If we are this far, then we are commited to this device.
	224	* If the super_block doesn't exist, or doesn't match others,
	225	* then we cannot continue
	226	*/
	227	if (verbose)
	228	fprintf(stderr, Name ": %s is identified as a member of %s.\n",
	229	devname, mddev);
	230
	231	if (!havesuper) {
	232	fprintf(stderr, Name ": %s has no superblock - assembly aborted\n",
	233	devname);
	234	return 1;
	235	}
	236	if (compare_super(&first_super, &super)) {
	237	fprintf(stderr, Name ": superblock on %s doesn't match others - assembly aborted\n",
	238	devname);
	239	return 1;
64c4757e NB	240	}
64c4757e NB	241
64c4757e	242	if (devcnt >= MD_SB_DISKS) {
682c7051	243	fprintf(stderr, Name ": ouch - too many devices appear to be in this array. Ignoring %s\n",
64c4757e NB	244	devname);
	245	continue;
	246	}
	247	devices[devcnt].devname = devname;
	248	devices[devcnt].major = MAJOR(stb.st_rdev);
	249	devices[devcnt].minor = MINOR(stb.st_rdev);
	250	devices[devcnt].events = md_event(&super);
	251	devices[devcnt].utime = super.utime;
52826846	252	devices[devcnt].raid_disk = super.this_disk.raid_disk;
64c4757e NB	253	devices[devcnt].uptodate = 0;
	254	if (most_recent < devcnt) {
	255	if (devices[devcnt].events
	256	> devices[most_recent].events)
	257	most_recent = devcnt;
	258	}
52826846 NB	259	i = devices[devcnt].raid_disk;
	260	if (i>=0 && i < MD_SB_DISKS)
	261	if (best[i] == -1
	262	\|\| devices[best[i]].events < devices[devcnt].events)
	263	best[i] = devcnt;
	264
64c4757e NB	265	devcnt++;
	266	}
	267
	268	if (devcnt == 0) {
682c7051	269	fprintf(stderr, Name ": no devices found for %s\n",
64c4757e NB	270	mddev);
	271	return 1;
	272	}
	273	/* now we have some devices that might be suitable.
	274	* I wonder how many
	275	*/
	276	okcnt = 0;
52826846 NB	277	sparecnt=0;
52826846 NB	278	for (i=0; i< MD_SB_DISKS;i++) {
64c4757e NB	279	int j = best[i];
	280	if (j < 0) continue;
	281	if (devices[j].events+1 >=
	282	devices[most_recent].events) {
	283	devices[j].uptodate = 1;
52826846 NB	284	if (i < first_super.raid_disks)
	285	okcnt++;
	286	else
	287	sparecnt++;
64c4757e NB	288	}
	289	}
	290	while (force && !enough(first_super.level, first_super.raid_disks, okcnt)) {
	291	/* Choose the newest best drive which is
	292	* not up-to-date, update the superblock
	293	* and add it.
	294	*/
52826846 NB	295	int fd;
	296	for (i=0; i<first_super.raid_disks; i++) {
	297	int j = best[i];
	298	if (j>=0 &&
	299	!devices[j].uptodate &&
	300	devices[j].events > 0 &&
	301	(chosen_drive < 0 \|\|
	302	devices[j].events > devices[chosen_drive].events))
	303	chosen_drive = j;
	304	}
	305	if (chosen_drive < 0)
	306	break;
	307	fprintf(stderr, Name ": forcing event count in %s(%d) from %d upto %d\n",
	308	devices[chosen_drive].devname, devices[chosen_drive].raid_disk,
	309	(int)(devices[chosen_drive].events),
	310	(int)(devices[most_recent].events));
	311	fd = open(devices[chosen_drive].devname, O_RDWR);
	312	if (fd < 0) {
	313	fprintf(stderr, Name ": Couldn't open %s for write - not updating\n",
	314	devices[chosen_drive].devname);
	315	devices[chosen_drive].events = 0;
	316	continue;
	317	}
	318	if (load_super(fd, &super)) {
	319	close(fd);
	320	fprintf(stderr, Name ": RAID superblock disappeared from %s - not updating.\n",
	321	devices[chosen_drive].devname);
	322	devices[chosen_drive].events = 0;
	323	continue;
	324	}
	325	super.events_hi = (devices[most_recent].events>>32)&0xFFFFFFFF;
	326	super.events_lo = (devices[most_recent].events)&0xFFFFFFFF;
	327	super.sb_csum = calc_sb_csum(&super);
	328	/DRYRUN/ if (store_super(fd, &super)) {
	329	close(fd);
	330	fprintf(stderr, Name ": Could not re-write superblock on %s\n",
	331	devices[chosen_drive].devname);
	332	devices[chosen_drive].events = 0;
	333	continue;
	334	}
	335	close(fd);
	336	devices[chosen_drive].events = devices[most_recent].events;
	337	devices[chosen_drive].uptodate = 1;
	338	okcnt++;
64c4757e	339	}
52826846 NB	340
	341	/* Now we want to look at the superblock which the kernel will base things on
	342	* and compare the devices that we think are working with the devices that the
	343	* superblock thinks are working.
	344	* If there are differences and --force is given, then update this chosen
	345	* superblock.
	346	*/
	347	for (i=0; chosen_drive < 0 && i<MD_SB_DISKS; i++) {
	348	int j = best[i];
	349	int fd;
	350	if (j<0)
	351	continue;
	352	if (!devices[j].uptodate)
	353	continue;
	354	chosen_drive = j;
	355	if ((fd=open(devices[j].devname, O_RDONLY))< 0) {
	356	fprintf(stderr, Name ": Cannot open %s: %s\n",
	357	devices[j].devname, strerror(errno));
	358	return 1;
	359	}
	360	if (load_super(fd, &super)) {
	361	close(fd);
	362	fprintf(stderr, Name ": RAID superblock has disappeared from %s\n",
	363	devices[j].devname);
	364	return 1;
	365	}
	366	close(fd);
	367	}
	368
	369	for (i=0; i<MD_SB_DISKS; i++) {
	370	int j = best[i];
	371	if (j<0)
	372	continue;
	373	if (!devices[j].uptodate)
	374	continue;
	375	if (devices[j].major != super.disks[j].major \|\|
	376	devices[j].minor != super.disks[j].minor) {
	377	change \|= 1;
	378	super.disks[j].major = devices[j].major;
	379	super.disks[j].minor = devices[j].minor;
	380	}
	381	if (devices[j].uptodate &&
	382	(super.disks[i].state & (1 << MD_DISK_FAULTY))) {
	383	if (force) {
	384	fprintf(stderr, Name ": "
	385	"clearing FAULT flag for device %d in %s for %s\n",
	386	j, mddev, devices[j].devname);
	387	super.disks[i].state &= ~(1<<MD_DISK_FAULTY);
	388	change \|= 2;
	389	} else {
	390	fprintf(stderr, Name ": "
	391	"device %d in %s is marked faulty in superblock, but %s seems ok\n",
	392	i, mddev, devices[j].devname);
	393	}
	394	}
	395	if (!devices[j].uptodate &&
	396	!(super.disks[i].state & (1 << MD_DISK_FAULTY))) {
	397	fprintf(stderr, Name ": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
	398	i, mddev);
	399	}
	400	}
	401
	402	if ((force && (change & 2))
	403	\|\| (old_linux && (change & 1))) {
404	int fd;
405	super.sb_csum = calc_sb_csum(&super);
406	fd = open(devices[chosen_drive].devname, O_RDWR);
407	if (fd < 0) {
408	fprintf(stderr, Name ": Could open %s for write - cannot Assemble array.\n",
409	devices[chosen_drive].devname);
410	return 1;
411	}
412	if (store_super(fd, &super)) {
413	close(fd);
414	fprintf(stderr, Name ": Could not re-write superblock on %s\n",
415	devices[chosen_drive].devname);
416	return 1;
417	}
418	close(fd);
419	change = 0;
420	}
421
64c4757e NB	422	/* Almost ready to actually do something */
	423	if (!old_linux) {
	424	if (ioctl(mdfd, SET_ARRAY_INFO, NULL) != 0) {
682c7051	425	fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
64c4757e NB	426	mddev, strerror(errno));
	427	return 1;
	428	}
52826846 NB	429	/* First, add the raid disks, but add the chosen one last */
	430	for (i=0; i<=MD_SB_DISKS; i++) {
	431	int j;
	432	if (i < MD_SB_DISKS) {
	433	j = best[i];
	434	if (j == chosen_drive)
	435	continue;
	436	} else
	437	j = chosen_drive;
	438
0db17fcb	439	if (j >= 0 && devices[j].uptodate) {
64c4757e NB	440	mdu_disk_info_t disk;
	441	memset(&disk, 0, sizeof(disk));
	442	disk.major = devices[j].major;
	443	disk.minor = devices[j].minor;
	444	if (ioctl(mdfd, ADD_NEW_DISK, &disk)!=0) {
682c7051	445	fprintf(stderr, Name ": failed to add %s to %s: %s\n",
64c4757e NB	446	devices[j].devname,
	447	mddev,
	448	strerror(errno));
52826846 NB	449	if (i < first_super.raid_disks)
	450	okcnt--;
	451	else
	452	sparecnt--;
	453	} else if (verbose)
	454	fprintf(stderr, Name ": added %s to %s as %d\n",
	455	devices[j].devname, mddev, devices[j].raid_disk);
	456	} else if (verbose && i < first_super.raid_disks)
682c7051	457	fprintf(stderr, Name ": no uptodate device for slot %d of %s\n",
64c4757e NB	458	i, mddev);
64c4757e NB	459	}
52826846	460
64c4757e NB	461	if (runstop == 1 \|\|
	462	(runstop == 0 &&
	463	enough(first_super.level, first_super.raid_disks, okcnt))) {
82b27616	464	if (ioctl(mdfd, RUN_ARRAY, NULL)==0) {
52826846 NB	465	fprintf(stderr, Name ": %s has been started with %d drive%s",
	466	mddev, okcnt, okcnt==1?"":"s");
	467	if (sparecnt)
	468	fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
	469	fprintf(stderr, ".\n");
64c4757e	470	return 0;
82b27616	471	}
682c7051	472	fprintf(stderr, Name ": failed to RUN_ARRAY %s: %s\n",
64c4757e NB	473	mddev, strerror(errno));
	474	return 1;
	475	}
82b27616	476	if (runstop == -1) {
52826846 NB	477	fprintf(stderr, Name ": %s assembled from %d drive%s, but not started.\n",
52826846 NB	478	mddev, okcnt, okcnt==1?"":"s");
64c4757e	479	return 0;
82b27616	480	}
52826846 NB	481	fprintf(stderr, Name ": %s assembled from %d drive%s - not enough to start it.\n",
52826846 NB	482	mddev, okcnt, okcnt==1?"":"s");
64c4757e	483	return 1;
82b27616	484	} else {
52826846 NB	485	/* The "chosen_drive" is a good choice, and if necessary, the superblock has
	486	* been updated to point to the current locations of devices.
	487	* so we can just start the array
82b27616	488	*/
82b27616	489	int dev;
82b27616 NB	490	dev = MKDEV(devices[chosen_drive].major,
	491	devices[chosen_drive].minor);
	492	if (ioctl(mdfd, START_ARRAY, dev)) {
	493	fprintf(stderr, Name ": Cannot start array: %s\n",
	494	strerror(errno));
	495	}
	496
64c4757e NB	497	}
64c4757e NB	498	}