mdadm.h: Introduced unaligned {get,put}_unaligned{16,32}()

[thirdparty/mdadm.git] / mdadm.c

/*
 * mdadm - manage Linux "md" devices aka RAID arrays.
 *
 * Copyright (C) 2001-2013 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>
 *
 *    Additions for bitmap and write-behind RAID options, Copyright (C) 2003-2004,
 *    Paul Clements, SteelEye Technology, Inc.
 */

#include "mdadm.h"
#include "md_p.h"
#include <ctype.h>

static int scan_assemble(struct supertype *ss,
			 struct context *c,
			 struct mddev_ident *ident);
static int misc_scan(char devmode, struct context *c);
static int stop_scan(int verbose);
static int misc_list(struct mddev_dev *devlist,
		     struct mddev_ident *ident,
		     char *dump_directory,
		     struct supertype *ss, struct context *c);
const char Name[] = "mdadm";

int main(int argc, char *argv[])
{
	int mode = 0;
	int opt;
	int option_index;
	int rv;
	int i;

	unsigned long long array_size = 0;
	unsigned long long data_offset = INVALID_SECTORS;
	struct mddev_ident ident;
	char *configfile = NULL;
	int devmode = 0;
	int bitmap_fd = -1;
	struct mddev_dev *devlist = NULL;
	struct mddev_dev **devlistend = & devlist;
	struct mddev_dev *dv;
	mdu_array_info_t array;
	int devs_found = 0;
	char *symlinks = NULL;
	int grow_continue = 0;
	/* autof indicates whether and how to create device node.
	 * bottom 3 bits are style.  Rest (when shifted) are number of parts
	 * 0  - unset
	 * 1  - don't create (no)
	 * 2  - if is_standard, then create (yes)
	 * 3  - create as 'md' - reject is_standard mdp (md)
	 * 4  - create as 'mdp' - reject is_standard md (mdp)
	 * 5  - default to md if not is_standard (md in config file)
	 * 6  - default to mdp if not is_standard (part, or mdp in config file)
	 */
	struct context c = {
		.require_homehost = 1,
	};
	struct shape s = {
		.journaldisks	= 0,
		.level		= UnSet,
		.layout		= UnSet,
		.bitmap_chunk	= UnSet,
		.consistency_policy	= CONSISTENCY_POLICY_UNKNOWN,
	};

	char sys_hostname[256];
	char *mailaddr = NULL;
	char *program = NULL;
	int increments = 20;
	int daemonise = 0;
	char *pidfile = NULL;
	int oneshot = 0;
	int spare_sharing = 1;
	struct supertype *ss = NULL;
	enum flag_mode writemostly = FlagDefault;
	enum flag_mode failfast = FlagDefault;
	char *shortopt = short_options;
	int dosyslog = 0;
	int rebuild_map = 0;
	char *remove_path = NULL;
	char *udev_filename = NULL;
	char *dump_directory = NULL;

	int print_help = 0;
	FILE *outf;

	int mdfd = -1;
	int locked = 0;

	srandom(time(0) ^ getpid());

	ident.uuid_set = 0;
	ident.level = UnSet;
	ident.raid_disks = UnSet;
	ident.super_minor = UnSet;
	ident.devices = 0;
	ident.spare_group = NULL;
	ident.autof = 0;
	ident.st = NULL;
	ident.bitmap_fd = -1;
	ident.bitmap_file = NULL;
	ident.name[0] = 0;
	ident.container = NULL;
	ident.member = NULL;

	if (get_linux_version() < 2006015) {
		pr_err("This version of mdadm does not support kernels older than 2.6.15\n");
		exit(1);
	}

	while ((option_index = -1),
	       (opt = getopt_long(argc, argv, shortopt, long_options,
				  &option_index)) != -1) {
		int newmode = mode;
		/* firstly, some mode-independent options */
		switch(opt) {
		case HelpOptions:
			print_help = 2;
			continue;
		case 'h':
			print_help = 1;
			continue;

		case 'V':
			fputs(Version, stderr);
			exit(0);

		case 'v': c.verbose++;
			continue;

		case 'q': c.verbose--;
			continue;

		case 'b':
			if (mode == ASSEMBLE || mode == BUILD ||
			    mode == CREATE || mode == GROW ||
			    mode == INCREMENTAL || mode == MANAGE)
				break; /* b means bitmap */
		case Brief:
			c.brief = 1;
			continue;

		case 'Y': c.export++;
			continue;

		case HomeHost:
			if (strcasecmp(optarg, "<ignore>") == 0)
				c.require_homehost = 0;
			else
				c.homehost = optarg;
			continue;

		case OffRootOpt:
			/* Silently ignore old option */
			continue;

		case Prefer:
			if (c.prefer)
				free(c.prefer);
			if (asprintf(&c.prefer, "/%s/", optarg) <= 0)
				c.prefer = NULL;
			continue;

		case ':':
		case '?':
			fputs(Usage, stderr);
			exit(2);
		}
		/* second, figure out the mode.
		 * Some options force the mode.  Others
		 * set the mode if it isn't already
		 */

		switch(opt) {
		case ManageOpt:
			newmode = MANAGE;
			shortopt = short_bitmap_options;
			break;
		case 'a':
		case Add:
		case AddSpare:
		case AddJournal:
		case 'r':
		case Remove:
		case Replace:
		case With:
		case 'f':
		case Fail:
		case ReAdd: /* re-add */
		case ClusterConfirm:
			if (!mode) {
				newmode = MANAGE;
				shortopt = short_bitmap_options;
			}
			break;

		case 'A': newmode = ASSEMBLE;
			shortopt = short_bitmap_auto_options;
			break;
		case 'B': newmode = BUILD;
			shortopt = short_bitmap_auto_options;
			break;
		case 'C': newmode = CREATE;
			shortopt = short_bitmap_auto_options;
			break;
		case 'F': newmode = MONITOR;
			break;
		case 'G': newmode = GROW;
			shortopt = short_bitmap_options;
			break;
		case 'I': newmode = INCREMENTAL;
			shortopt = short_bitmap_auto_options;
			break;
		case AutoDetect:
			newmode = AUTODETECT;
			break;

		case MiscOpt:
		case 'D':
		case 'E':
		case 'X':
		case 'Q':
		case ExamineBB:
		case Dump:
		case Restore:
		case Action:
			newmode = MISC;
			break;

		case 'R':
		case 'S':
		case 'o':
		case 'w':
		case 'W':
		case WaitOpt:
		case Waitclean:
		case DetailPlatform:
		case KillSubarray:
		case UpdateSubarray:
		case UdevRules:
		case KillOpt:
			if (!mode)
				newmode = MISC;
			break;

		case NoSharing:
			newmode = MONITOR;
			break;
		}
		if (mode && newmode == mode) {
			/* everybody happy ! */
		} else if (mode && newmode != mode) {
			/* not allowed.. */
			pr_err("");
			if (option_index >= 0)
				fprintf(stderr, "--%s", long_options[option_index].name);
			else
				fprintf(stderr, "-%c", opt);
			fprintf(stderr, " would set mdadm mode to \"%s\", but it is already set to \"%s\".\n",
				map_num(modes, newmode),
				map_num(modes, mode));
			exit(2);
		} else if (!mode && newmode) {
			mode = newmode;
			if (mode == MISC && devs_found) {
				pr_err("No action given for %s in --misc mode\n",
					devlist->devname);
				cont_err("Action options must come before device names\n");
				exit(2);
			}
		} else {
			/* special case of -c --help */
			if ((opt == 'c' || opt == ConfigFile) &&
			    (strncmp(optarg, "--h", 3) == 0 ||
			     strncmp(optarg, "-h", 2) == 0)) {
				fputs(Help_config, stdout);
				exit(0);
			}

			/* If first option is a device, don't force the mode yet */
			if (opt == 1) {
				if (devs_found == 0) {
					dv = xmalloc(sizeof(*dv));
					dv->devname = optarg;
					dv->disposition = devmode;
					dv->writemostly = writemostly;
					dv->failfast = failfast;
					dv->used = 0;
					dv->next = NULL;
					*devlistend = dv;
					devlistend = &dv->next;

					devs_found++;
					continue;
				}
				/* No mode yet, and this is the second device ... */
				pr_err("An option must be given to set the mode before a second device\n"
					"       (%s) is listed\n", optarg);
				exit(2);
			}
			if (option_index >= 0)
				pr_err("--%s", long_options[option_index].name);
			else
				pr_err("-%c", opt);
			fprintf(stderr, " does not set the mode, and so cannot be the first option.\n");
			exit(2);
		}

		/* if we just set the mode, then done */
		switch(opt) {
		case ManageOpt:
		case MiscOpt:
		case 'A':
		case 'B':
		case 'C':
		case 'F':
		case 'G':
		case 'I':
		case AutoDetect:
			continue;
		}
		if (opt == 1) {
			/* an undecorated option - must be a device name.
			 */

			if (devs_found > 0 && devmode == DetailPlatform) {
				pr_err("controller may only be specified once. %s ignored\n",
						optarg);
				continue;
			}

			if (devs_found > 0 && mode == MANAGE && !devmode) {
				pr_err("Must give one of -a/-r/-f for subsequent devices at %s\n", optarg);
				exit(2);
			}
			if (devs_found > 0 && mode == GROW && !devmode) {
				pr_err("Must give -a/--add for devices to add: %s\n", optarg);
				exit(2);
			}
			dv = xmalloc(sizeof(*dv));
			dv->devname = optarg;
			dv->disposition = devmode;
			dv->writemostly = writemostly;
			dv->failfast = failfast;
			dv->used = 0;
			dv->next = NULL;
			*devlistend = dv;
			devlistend = &dv->next;

			devs_found++;
			continue;
		}

		/* We've got a mode, and opt is now something else which
		 * could depend on the mode */
#define O(a,b) ((a<<16)|b)
		switch (O(mode,opt)) {
		case O(GROW,'c'):
		case O(GROW,ChunkSize):
		case O(CREATE,'c'):
		case O(CREATE,ChunkSize):
		case O(BUILD,'c'): /* chunk or rounding */
		case O(BUILD,ChunkSize): /* chunk or rounding */
			if (s.chunk) {
				pr_err("chunk/rounding may only be specified once. Second value is %s.\n", optarg);
				exit(2);
			}
			s.chunk = parse_size(optarg);
			if (s.chunk == INVALID_SECTORS ||
			    s.chunk < 8 || (s.chunk&1)) {
				pr_err("invalid chunk/rounding value: %s\n",
					optarg);
				exit(2);
			}
			/* Convert sectors to K */
			s.chunk /= 2;
			continue;

		case O(INCREMENTAL, 'e'):
		case O(CREATE,'e'):
		case O(ASSEMBLE,'e'):
		case O(MISC,'e'): /* set metadata (superblock) information */
			if (ss) {
				pr_err("metadata information already given\n");
				exit(2);
			}
			for(i = 0; !ss && superlist[i]; i++)
				ss = superlist[i]->match_metadata_desc(optarg);

			if (!ss) {
				pr_err("unrecognised metadata identifier: %s\n", optarg);
				exit(2);
			}
			continue;

		case O(MANAGE,'W'):
		case O(MANAGE,WriteMostly):
		case O(BUILD,'W'):
		case O(BUILD,WriteMostly):
		case O(CREATE,'W'):
		case O(CREATE,WriteMostly):
			/* set write-mostly for following devices */
			writemostly = FlagSet;
			continue;

		case O(MANAGE,'w'):
			/* clear write-mostly for following devices */
			writemostly = FlagClear;
			continue;

		case O(MANAGE,FailFast):
		case O(CREATE,FailFast):
			failfast = FlagSet;
			continue;
		case O(MANAGE,NoFailFast):
			failfast = FlagClear;
			continue;

		case O(GROW,'z'):
		case O(CREATE,'z'):
		case O(BUILD,'z'): /* size */
			if (s.size > 0) {
				pr_err("size may only be specified once. Second value is %s.\n", optarg);
				exit(2);
			}
			if (strcmp(optarg, "max") == 0)
				s.size = MAX_SIZE;
			else {
				s.size = parse_size(optarg);
				if (s.size == INVALID_SECTORS || s.size < 8) {
					pr_err("invalid size: %s\n", optarg);
					exit(2);
				}
				/* convert sectors to K */
				s.size /= 2;
			}
			continue;

		case O(GROW,'Z'): /* array size */
			if (array_size > 0) {
				pr_err("array-size may only be specified once. Second value is %s.\n", optarg);
				exit(2);
			}
			if (strcmp(optarg, "max") == 0)
				array_size = MAX_SIZE;
			else {
				array_size = parse_size(optarg);
				if (array_size == 0 ||
				    array_size == INVALID_SECTORS) {
					pr_err("invalid array size: %s\n",
						optarg);
					exit(2);
				}
			}
			continue;

		case O(CREATE,DataOffset):
		case O(GROW,DataOffset):
			if (data_offset != INVALID_SECTORS) {
				pr_err("data-offset may only be specified one. Second value is %s.\n", optarg);
				exit(2);
			}
			if (mode == CREATE && strcmp(optarg, "variable") == 0)
				data_offset = VARIABLE_OFFSET;
			else
				data_offset = parse_size(optarg);
			if (data_offset == INVALID_SECTORS) {
				pr_err("invalid data-offset: %s\n",
					optarg);
				exit(2);
			}
			continue;

		case O(GROW,'l'):
		case O(CREATE,'l'):
		case O(BUILD,'l'): /* set raid level*/
			if (s.level != UnSet) {
				pr_err("raid level may only be set once.  Second value is %s.\n", optarg);
				exit(2);
			}
			s.level = map_name(pers, optarg);
			if (s.level == UnSet) {
				pr_err("invalid raid level: %s\n",
					optarg);
				exit(2);
			}
			if (s.level != 0 && s.level != LEVEL_LINEAR &&
			    s.level != 1 && s.level != LEVEL_MULTIPATH &&
			    s.level != LEVEL_FAULTY && s.level != 10 &&
			    mode == BUILD) {
				pr_err("Raid level %s not permitted with --build.\n",
					optarg);
				exit(2);
			}
			if (s.sparedisks > 0 && s.level < 1 && s.level >= -1) {
				pr_err("raid level %s is incompatible with spare-devices setting.\n",
					optarg);
				exit(2);
			}
			ident.level = s.level;
			continue;

		case O(GROW, 'p'): /* new layout */
		case O(GROW, Layout):
			if (s.layout_str) {
				pr_err("layout may only be sent once.  Second value was %s\n", optarg);
				exit(2);
			}
			s.layout_str = optarg;
			/* 'Grow' will parse the value */
			continue;

		case O(CREATE,'p'): /* raid5 layout */
		case O(CREATE,Layout):
		case O(BUILD,'p'): /* faulty layout */
		case O(BUILD,Layout):
			if (s.layout != UnSet) {
				pr_err("layout may only be sent once.  Second value was %s\n", optarg);
				exit(2);
			}
			switch(s.level) {
			default:
				pr_err("layout not meaningful for %s arrays.\n",
					map_num(pers, s.level));
				exit(2);
			case UnSet:
				pr_err("raid level must be given before layout.\n");
				exit(2);

			case 5:
				s.layout = map_name(r5layout, optarg);
				if (s.layout == UnSet) {
					pr_err("layout %s not understood for raid5.\n",
						optarg);
					exit(2);
				}
				break;
			case 6:
				s.layout = map_name(r6layout, optarg);
				if (s.layout == UnSet) {
					pr_err("layout %s not understood for raid6.\n",
						optarg);
					exit(2);
				}
				break;

			case 10:
				s.layout = parse_layout_10(optarg);
				if (s.layout < 0) {
					pr_err("layout for raid10 must be 'nNN', 'oNN' or 'fNN' where NN is a number, not %s\n", optarg);
					exit(2);
				}
				break;
			case LEVEL_FAULTY:
				/* Faulty
				 * modeNNN
				 */
				s.layout = parse_layout_faulty(optarg);
				if (s.layout == -1) {
					pr_err("layout %s not understood for faulty.\n",
						optarg);
					exit(2);
				}
				break;
			}
			continue;

		case O(CREATE,AssumeClean):
		case O(BUILD,AssumeClean): /* assume clean */
		case O(GROW,AssumeClean):
			s.assume_clean = 1;
			continue;

		case O(GROW,'n'):
		case O(CREATE,'n'):
		case O(BUILD,'n'): /* number of raid disks */
			if (s.raiddisks) {
				pr_err("raid-devices set twice: %d and %s\n",
					s.raiddisks, optarg);
				exit(2);
			}
			s.raiddisks = parse_num(optarg);
			if (s.raiddisks <= 0) {
				pr_err("invalid number of raid devices: %s\n",
					optarg);
				exit(2);
			}
			ident.raid_disks = s.raiddisks;
			continue;
		case O(ASSEMBLE, Nodes):
		case O(GROW, Nodes):
		case O(CREATE, Nodes):
			c.nodes = parse_num(optarg);
			if (c.nodes < 2) {
				pr_err("clustered array needs two nodes at least: %s\n",
					optarg);
				exit(2);
			}
			continue;
		case O(CREATE, ClusterName):
		case O(ASSEMBLE, ClusterName):
			c.homecluster = optarg;
			if (strlen(c.homecluster) > 64) {
				pr_err("Cluster name too big.\n");
				exit(2);
			}
			continue;
		case O(CREATE,'x'): /* number of spare (eXtra) disks */
			if (s.sparedisks) {
				pr_err("spare-devices set twice: %d and %s\n",
				       s.sparedisks, optarg);
				exit(2);
			}
			if (s.level != UnSet && s.level <= 0 && s.level >= -1) {
				pr_err("spare-devices setting is incompatible with raid level %d\n",
					s.level);
				exit(2);
			}
			s.sparedisks = parse_num(optarg);
			if (s.sparedisks < 0) {
				pr_err("invalid number of spare-devices: %s\n",
					optarg);
				exit(2);
			}
			continue;

		case O(CREATE,'a'):
		case O(CREATE,Auto):
		case O(BUILD,'a'):
		case O(BUILD,Auto):
		case O(INCREMENTAL,'a'):
		case O(INCREMENTAL,Auto):
		case O(ASSEMBLE,'a'):
		case O(ASSEMBLE,Auto): /* auto-creation of device node */
			c.autof = parse_auto(optarg, "--auto flag", 0);
			continue;

		case O(CREATE,Symlinks):
		case O(BUILD,Symlinks):
		case O(ASSEMBLE,Symlinks): /* auto creation of symlinks in /dev to /dev/md */
			symlinks = optarg;
			continue;

		case O(BUILD,'f'): /* force honouring '-n 1' */
		case O(BUILD,Force): /* force honouring '-n 1' */
		case O(GROW,'f'): /* ditto */
		case O(GROW,Force): /* ditto */
		case O(CREATE,'f'): /* force honouring of device list */
		case O(CREATE,Force): /* force honouring of device list */
		case O(ASSEMBLE,'f'): /* force assembly */
		case O(ASSEMBLE,Force): /* force assembly */
		case O(MISC,'f'): /* force zero */
		case O(MISC,Force): /* force zero */
		case O(MANAGE,Force): /* add device which is too large */
			c.force = 1;
			continue;
			/* now for the Assemble options */
		case O(ASSEMBLE, FreezeReshape):   /* Freeze reshape during
						    * initrd phase */
		case O(INCREMENTAL, FreezeReshape):
			c.freeze_reshape = 1;
			continue;
		case O(CREATE,'u'): /* uuid of array */
		case O(ASSEMBLE,'u'): /* uuid of array */
			if (ident.uuid_set) {
				pr_err("uuid cannot be set twice.  Second value %s.\n", optarg);
				exit(2);
			}
			if (parse_uuid(optarg, ident.uuid))
				ident.uuid_set = 1;
			else {
				pr_err("Bad uuid: %s\n", optarg);
				exit(2);
			}
			continue;

		case O(CREATE,'N'):
		case O(ASSEMBLE,'N'):
		case O(MISC,'N'):
			if (ident.name[0]) {
				pr_err("name cannot be set twice.   Second value %s.\n", optarg);
				exit(2);
			}
			if (mode == MISC && !c.subarray) {
				pr_err("-N/--name only valid with --update-subarray in misc mode\n");
				exit(2);
			}
			if (strlen(optarg) > 32) {
				pr_err("name '%s' is too long, 32 chars max.\n",
					optarg);
				exit(2);
			}
			strcpy(ident.name, optarg);
			continue;

		case O(ASSEMBLE,'m'): /* super-minor for array */
		case O(ASSEMBLE,SuperMinor):
			if (ident.super_minor != UnSet) {
				pr_err("super-minor cannot be set twice.  Second value: %s.\n", optarg);
				exit(2);
			}
			if (strcmp(optarg, "dev") == 0)
				ident.super_minor = -2;
			else {
				ident.super_minor = parse_num(optarg);
				if (ident.super_minor < 0) {
					pr_err("Bad super-minor number: %s.\n", optarg);
					exit(2);
				}
			}
			continue;

		case O(ASSEMBLE,'o'):
		case O(MANAGE,'o'):
		case O(CREATE,'o'):
			c.readonly = 1;
			continue;

		case O(ASSEMBLE,'U'): /* update the superblock */
		case O(MISC,'U'):
			if (c.update) {
				pr_err("Can only update one aspect of superblock, both %s and %s given.\n",
					c.update, optarg);
				exit(2);
			}
			if (mode == MISC && !c.subarray) {
				pr_err("Only subarrays can be updated in misc mode\n");
				exit(2);
			}
			c.update = optarg;
			if (strcmp(c.update, "sparc2.2") == 0)
				continue;
			if (strcmp(c.update, "super-minor") == 0)
				continue;
			if (strcmp(c.update, "summaries") == 0)
				continue;
			if (strcmp(c.update, "resync") == 0)
				continue;
			if (strcmp(c.update, "uuid") == 0)
				continue;
			if (strcmp(c.update, "name") == 0)
				continue;
			if (strcmp(c.update, "homehost") == 0)
				continue;
			if (strcmp(c.update, "home-cluster") == 0)
				continue;
			if (strcmp(c.update, "nodes") == 0)
				continue;
			if (strcmp(c.update, "devicesize") == 0)
				continue;
			if (strcmp(c.update, "no-bitmap") == 0)
				continue;
			if (strcmp(c.update, "bbl") == 0)
				continue;
			if (strcmp(c.update, "no-bbl") == 0)
				continue;
			if (strcmp(c.update, "force-no-bbl") == 0)
				continue;
			if (strcmp(c.update, "ppl") == 0)
				continue;
			if (strcmp(c.update, "no-ppl") == 0)
				continue;
			if (strcmp(c.update, "metadata") == 0)
				continue;
			if (strcmp(c.update, "revert-reshape") == 0)
				continue;
			if (strcmp(c.update, "byteorder") == 0) {
				if (ss) {
					pr_err("must not set metadata type with --update=byteorder.\n");
					exit(2);
				}
				for(i = 0; !ss && superlist[i]; i++)
					ss = superlist[i]->match_metadata_desc(
						"0.swap");
				if (!ss) {
					pr_err("INTERNAL ERROR cannot find 0.swap\n");
					exit(2);
				}

				continue;
			}
			if (strcmp(c.update,"?") == 0 ||
			    strcmp(c.update, "help") == 0) {
				outf = stdout;
				fprintf(outf, "%s: ", Name);
			} else {
				outf = stderr;
				fprintf(outf,
					"%s: '--update=%s' is invalid.  ",
					Name, c.update);
			}
			fprintf(outf, "Valid --update options are:\n"
		"     'sparc2.2', 'super-minor', 'uuid', 'name', 'nodes', 'resync',\n"
		"     'summaries', 'homehost', 'home-cluster', 'byteorder', 'devicesize',\n"
		"     'no-bitmap', 'metadata', 'revert-reshape'\n"
		"     'bbl', 'no-bbl', 'force-no-bbl', 'ppl', 'no-ppl'\n"
				);
			exit(outf == stdout ? 0 : 2);

		case O(MANAGE,'U'):
			/* update=devicesize is allowed with --re-add */
			if (devmode != 'A') {
				pr_err("--update in Manage mode only allowed with --re-add.\n");
				exit(1);
			}
			if (c.update) {
				pr_err("Can only update one aspect of superblock, both %s and %s given.\n",
					c.update, optarg);
				exit(2);
			}
			c.update = optarg;
			if (strcmp(c.update, "devicesize") != 0 &&
			    strcmp(c.update, "bbl") != 0 &&
			    strcmp(c.update, "force-no-bbl") != 0 &&
			    strcmp(c.update, "no-bbl") != 0) {
				pr_err("only 'devicesize', 'bbl', 'no-bbl', and 'force-no-bbl' can be updated with --re-add\n");
				exit(2);
			}
			continue;

		case O(INCREMENTAL,NoDegraded):
			pr_err("--no-degraded is deprecated in Incremental mode\n");
		case O(ASSEMBLE,NoDegraded): /* --no-degraded */
			c.runstop = -1; /* --stop isn't allowed for --assemble,
					 * so we overload slightly */
			continue;

		case O(ASSEMBLE,'c'):
		case O(ASSEMBLE,ConfigFile):
		case O(INCREMENTAL, 'c'):
		case O(INCREMENTAL, ConfigFile):
		case O(MISC, 'c'):
		case O(MISC, ConfigFile):
		case O(MONITOR,'c'):
		case O(MONITOR,ConfigFile):
		case O(CREATE,ConfigFile):
			if (configfile) {
				pr_err("configfile cannot be set twice.  Second value is %s.\n", optarg);
				exit(2);
			}
			configfile = optarg;
			set_conffile(configfile);
			/* FIXME possibly check that config file exists.  Even parse it */
			continue;
		case O(ASSEMBLE,'s'): /* scan */
		case O(MISC,'s'):
		case O(MONITOR,'s'):
		case O(INCREMENTAL,'s'):
			c.scan = 1;
			continue;

		case O(MONITOR,'m'): /* mail address */
		case O(MONITOR,EMail):
			if (mailaddr)
				pr_err("only specify one mailaddress. %s ignored.\n",
					optarg);
			else
				mailaddr = optarg;
			continue;

		case O(MONITOR,'p'): /* alert program */
		case O(MONITOR,ProgramOpt): /* alert program */
			if (program)
				pr_err("only specify one alter program. %s ignored.\n",
					optarg);
			else
				program = optarg;
			continue;

		case O(MONITOR,'r'): /* rebuild increments */
		case O(MONITOR,Increment):
			increments = atoi(optarg);
			if (increments > 99 || increments < 1) {
				pr_err("please specify positive integer between 1 and 99 as rebuild increments.\n");
				exit(2);
			}
			continue;

		case O(MONITOR,'d'): /* delay in seconds */
		case O(GROW, 'd'):
		case O(BUILD,'d'): /* delay for bitmap updates */
		case O(CREATE,'d'):
			if (c.delay)
				pr_err("only specify delay once. %s ignored.\n",
					optarg);
			else {
				c.delay = parse_num(optarg);
				if (c.delay < 1) {
					pr_err("invalid delay: %s\n",
						optarg);
					exit(2);
				}
			}
			continue;
		case O(MONITOR,'f'): /* daemonise */
		case O(MONITOR,Fork):
			daemonise = 1;
			continue;
		case O(MONITOR,'i'): /* pid */
			if (pidfile)
				pr_err("only specify one pid file. %s ignored.\n",
					optarg);
			else
				pidfile = optarg;
			continue;
		case O(MONITOR,'1'): /* oneshot */
			oneshot = 1;
			spare_sharing = 0;
			continue;
		case O(MONITOR,'t'): /* test */
			c.test = 1;
			continue;
		case O(MONITOR,'y'): /* log messages to syslog */
			openlog("mdadm", LOG_PID, SYSLOG_FACILITY);
			dosyslog = 1;
			continue;
		case O(MONITOR, NoSharing):
			spare_sharing = 0;
			continue;

			/* now the general management options.  Some are applicable
			 * to other modes. None have arguments.
			 */
		case O(GROW,'a'):
		case O(GROW,Add):
		case O(MANAGE,'a'):
		case O(MANAGE,Add): /* add a drive */
			devmode = 'a';
			continue;
		case O(MANAGE,AddSpare): /* add drive - never re-add */
			devmode = 'S';
			continue;
		case O(MANAGE,AddJournal): /* add journal */
			if (s.journaldisks && (s.level < 4 || s.level > 6)) {
				pr_err("--add-journal is only supported for RAID level 4/5/6.\n");
				exit(2);
			}
			devmode = 'j';
			continue;
		case O(MANAGE,ReAdd):
			devmode = 'A';
			continue;
		case O(MANAGE,'r'): /* remove a drive */
		case O(MANAGE,Remove):
			devmode = 'r';
			continue;
		case O(MANAGE,'f'): /* set faulty */
		case O(MANAGE,Fail):
		case O(INCREMENTAL,'f'):
		case O(INCREMENTAL,Remove):
		case O(INCREMENTAL,Fail): /* r for incremental is taken, use f
					   * even though we will both fail and
					   * remove the device */
			devmode = 'f';
			continue;
		case O(MANAGE, ClusterConfirm):
			devmode = 'c';
			continue;
		case O(MANAGE,Replace):
			/* Mark these devices for replacement */
			devmode = 'R';
			continue;
		case O(MANAGE,With):
			/* These are the replacements to use */
			if (devmode != 'R') {
				pr_err("--with must follow --replace\n");
				exit(2);
			}
			devmode = 'W';
			continue;
		case O(INCREMENTAL,'R'):
		case O(MANAGE,'R'):
		case O(ASSEMBLE,'R'):
		case O(BUILD,'R'):
		case O(CREATE,'R'): /* Run the array */
			if (c.runstop < 0) {
				pr_err("Cannot both Stop and Run an array\n");
				exit(2);
			}
			c.runstop = 1;
			continue;
		case O(MANAGE,'S'):
			if (c.runstop > 0) {
				pr_err("Cannot both Run and Stop an array\n");
				exit(2);
			}
			c.runstop = -1;
			continue;
		case O(MANAGE,'t'):
			c.test = 1;
			continue;

		case O(MISC,'Q'):
		case O(MISC,'D'):
		case O(MISC,'E'):
		case O(MISC,KillOpt):
		case O(MISC,'R'):
		case O(MISC,'S'):
		case O(MISC,'X'):
		case O(MISC, ExamineBB):
		case O(MISC,'o'):
		case O(MISC,'w'):
		case O(MISC,'W'):
		case O(MISC, WaitOpt):
		case O(MISC, Waitclean):
		case O(MISC, DetailPlatform):
		case O(MISC, KillSubarray):
		case O(MISC, UpdateSubarray):
		case O(MISC, Dump):
		case O(MISC, Restore):
		case O(MISC ,Action):
			if (opt == KillSubarray || opt == UpdateSubarray) {
				if (c.subarray) {
					pr_err("subarray can only be specified once\n");
					exit(2);
				}
				c.subarray = optarg;
			}
			if (opt == Action) {
				if (c.action) {
					pr_err("Only one --action can be specified\n");
					exit(2);
				}
				if (strcmp(optarg, "idle") == 0 ||
				    strcmp(optarg, "frozen") == 0 ||
				    strcmp(optarg, "check") == 0 ||
				    strcmp(optarg, "repair") == 0)
					c.action = optarg;
				else {
					pr_err("action must be one of idle, frozen, check, repair\n");
					exit(2);
				}
			}
			if (devmode && devmode != opt &&
			    (devmode == 'E' ||
			     (opt == 'E' && devmode != 'Q'))) {
				pr_err("--examine/-E cannot be given with ");
				if (devmode == 'E') {
					if (option_index >= 0)
						fprintf(stderr, "--%s\n",
							long_options[option_index].name);
					else
						fprintf(stderr, "-%c\n", opt);
				} else if (isalpha(devmode))
					fprintf(stderr, "-%c\n", devmode);
				else
					fprintf(stderr, "previous option\n");
				exit(2);
			}
			devmode = opt;
			if (opt == Dump || opt == Restore) {
				if (dump_directory != NULL) {
					pr_err("dump/restore directory specified twice: %s and %s\n",
					       dump_directory, optarg);
					exit(2);
				}
				dump_directory = optarg;
			}
			continue;
		case O(MISC, UdevRules):
			if (devmode && devmode != opt) {
				pr_err("--udev-rules must be the only option.\n");
			} else {
				if (udev_filename)
					pr_err("only specify one udev rule filename. %s ignored.\n",
						optarg);
				else
					udev_filename = optarg;
			}
			devmode = opt;
			continue;
		case O(MISC,'t'):
			c.test = 1;
			continue;

		case O(MISC, Sparc22):
			if (devmode != 'E') {
				pr_err("--sparc2.2 only allowed with --examine\n");
				exit(2);
			}
			c.SparcAdjust = 1;
			continue;

		case O(ASSEMBLE,'b'): /* here we simply set the bitmap file */
		case O(ASSEMBLE,Bitmap):
			if (!optarg) {
				pr_err("bitmap file needed with -b in --assemble mode\n");
				exit(2);
			}
			if (strcmp(optarg, "internal") == 0 ||
			    strcmp(optarg, "clustered") == 0) {
				pr_err("no need to specify --bitmap when assembling"
					" arrays with internal or clustered bitmap\n");
				continue;
			}
			bitmap_fd = open(optarg, O_RDWR);
			if (!*optarg || bitmap_fd < 0) {
				pr_err("cannot open bitmap file %s: %s\n", optarg, strerror(errno));
				exit(2);
			}
			ident.bitmap_fd = bitmap_fd; /* for Assemble */
			continue;

		case O(ASSEMBLE, BackupFile):
		case O(GROW, BackupFile):
			/* Specify a file into which grow might place a backup,
			 * or from which assemble might recover a backup
			 */
			if (c.backup_file) {
				pr_err("backup file already specified, rejecting %s\n", optarg);
				exit(2);
			}
			c.backup_file = optarg;
			continue;

		case O(GROW, Continue):
			/* Continue interrupted grow
			 */
			grow_continue = 1;
			continue;
		case O(ASSEMBLE, InvalidBackup):
			/* Acknowledge that the backupfile is invalid, but ask
			 * to continue anyway
			 */
			c.invalid_backup = 1;
			continue;

		case O(BUILD,'b'):
		case O(BUILD,Bitmap):
		case O(CREATE,'b'):
		case O(CREATE,Bitmap): /* here we create the bitmap */
		case O(GROW,'b'):
		case O(GROW,Bitmap):
			if (s.bitmap_file) {
				pr_err("bitmap cannot be set twice. Second value: %s.\n", optarg);
				exit(2);
			}
			if (strcmp(optarg, "internal") == 0 ||
			    strcmp(optarg, "none") == 0 ||
			    strchr(optarg, '/') != NULL) {
				s.bitmap_file = optarg;
				continue;
			}
			if (strcmp(optarg, "clustered") == 0) {
				s.bitmap_file = optarg;
				/* Set the default number of cluster nodes
				 * to 4 if not already set by user
				 */
				if (c.nodes < 1)
					c.nodes = 4;
				continue;
			}
			/* probable typo */
			pr_err("bitmap file must contain a '/', or be 'internal', or be 'clustered', or 'none'\n"
				"       not '%s'\n", optarg);
			exit(2);

		case O(GROW,BitmapChunk):
		case O(BUILD,BitmapChunk):
		case O(CREATE,BitmapChunk): /* bitmap chunksize */
			s.bitmap_chunk = parse_size(optarg);
			if (s.bitmap_chunk == 0 ||
			    s.bitmap_chunk == INVALID_SECTORS ||
			    s.bitmap_chunk & (s.bitmap_chunk - 1)) {
				pr_err("invalid bitmap chunksize: %s\n",
				       optarg);
				exit(2);
			}
			s.bitmap_chunk = s.bitmap_chunk * 512;
			continue;

		case O(GROW, WriteBehind):
		case O(BUILD, WriteBehind):
		case O(CREATE, WriteBehind): /* write-behind mode */
			s.write_behind = DEFAULT_MAX_WRITE_BEHIND;
			if (optarg) {
				s.write_behind = parse_num(optarg);
				if (s.write_behind < 0 ||
				    s.write_behind > 16383) {
					pr_err("Invalid value for maximum outstanding write-behind writes: %s.\n\tMust be between 0 and 16383.\n", optarg);
					exit(2);
				}
			}
			continue;

		case O(INCREMENTAL, 'r'):
		case O(INCREMENTAL, RebuildMapOpt):
			rebuild_map = 1;
			continue;
		case O(INCREMENTAL, IncrementalPath):
			remove_path = optarg;
			continue;
		case O(CREATE, WriteJournal):
			if (s.journaldisks) {
				pr_err("Please specify only one journal device for the array.\n");
				pr_err("Ignoring --write-journal %s...\n", optarg);
				continue;
			}
			dv = xmalloc(sizeof(*dv));
			dv->devname = optarg;
			dv->disposition = 'j';  /* WriteJournal */
			dv->used = 0;
			dv->next = NULL;
			*devlistend = dv;
			devlistend = &dv->next;
			devs_found++;

			s.journaldisks = 1;
			continue;
		case O(CREATE, 'k'):
		case O(GROW, 'k'):
			s.consistency_policy = map_name(consistency_policies,
							optarg);
			if (s.consistency_policy < CONSISTENCY_POLICY_RESYNC) {
				pr_err("Invalid consistency policy: %s\n",
				       optarg);
				exit(2);
			}
			continue;
		}
		/* We have now processed all the valid options. Anything else is
		 * an error
		 */
		if (option_index > 0)
			pr_err(":option --%s not valid in %s mode\n",
				long_options[option_index].name,
				map_num(modes, mode));
		else
			pr_err("option -%c not valid in %s mode\n",
				opt, map_num(modes, mode));
		exit(2);

	}

	if (print_help) {
		char *help_text;
		if (print_help == 2)
			help_text = OptionHelp;
		else
			help_text = mode_help[mode];
		if (help_text == NULL)
			help_text = Help;
		fputs(help_text,stdout);
		exit(0);
	}

	if (s.journaldisks) {
		if (s.level < 4 || s.level > 6) {
			pr_err("--write-journal is only supported for RAID level 4/5/6.\n");
			exit(2);
		}
		if (s.consistency_policy != CONSISTENCY_POLICY_UNKNOWN &&
		    s.consistency_policy != CONSISTENCY_POLICY_JOURNAL) {
			pr_err("--write-journal is not supported with consistency policy: %s\n",
			       map_num(consistency_policies, s.consistency_policy));
			exit(2);
		}
	}

	if (mode == CREATE &&
	    s.consistency_policy != CONSISTENCY_POLICY_UNKNOWN) {
		if (s.level <= 0) {
			pr_err("--consistency-policy not meaningful with level %s.\n",
			       map_num(pers, s.level));
			exit(2);
		} else if (s.consistency_policy == CONSISTENCY_POLICY_JOURNAL &&
			   !s.journaldisks) {
			pr_err("--write-journal is required for consistency policy: %s\n",
			       map_num(consistency_policies, s.consistency_policy));
			exit(2);
		} else if (s.consistency_policy == CONSISTENCY_POLICY_PPL &&
			   s.level != 5) {
			pr_err("PPL consistency policy is only supported for RAID level 5.\n");
			exit(2);
		} else if (s.consistency_policy == CONSISTENCY_POLICY_BITMAP &&
			   (!s.bitmap_file ||
			    strcmp(s.bitmap_file, "none") == 0)) {
			pr_err("--bitmap is required for consistency policy: %s\n",
			       map_num(consistency_policies, s.consistency_policy));
			exit(2);
		} else if (s.bitmap_file &&
			   strcmp(s.bitmap_file, "none") != 0 &&
			   s.consistency_policy != CONSISTENCY_POLICY_BITMAP &&
			   s.consistency_policy != CONSISTENCY_POLICY_JOURNAL) {
			pr_err("--bitmap is not compatible with consistency policy: %s\n",
			       map_num(consistency_policies, s.consistency_policy));
			exit(2);
		}
	}

	if (!mode && devs_found) {
		mode = MISC;
		devmode = 'Q';
		if (devlist->disposition == 0)
			devlist->disposition = devmode;
	}
	if (!mode) {
		fputs(Usage, stderr);
		exit(2);
	}

	if (symlinks) {
		struct createinfo *ci = conf_get_create_info();

		if (strcasecmp(symlinks, "yes") == 0)
			ci->symlinks = 1;
		else if (strcasecmp(symlinks, "no") == 0)
			ci->symlinks = 0;
		else {
			pr_err("option --symlinks must be 'no' or 'yes'\n");
			exit(2);
		}
	}
	/* Ok, got the option parsing out of the way
	 * hopefully it's mostly right but there might be some stuff
	 * missing
	 *
	 * That is mostly checked in the per-mode stuff but...
	 *
	 * For @,B,C and A without -s, the first device listed must be
	 * an md device.  We check that here and open it.
	 */

	if (mode == MANAGE || mode == BUILD || mode == CREATE ||
	    mode == GROW || (mode == ASSEMBLE && ! c.scan)) {
		if (devs_found < 1) {
			pr_err("an md device must be given in this mode\n");
			exit(2);
		}
		if ((int)ident.super_minor == -2 && c.autof) {
			pr_err("--super-minor=dev is incompatible with --auto\n");
			exit(2);
		}
		if (mode == MANAGE || mode == GROW) {
			mdfd = open_mddev(devlist->devname, 1);
			if (mdfd < 0)
				exit(1);
		} else
			/* non-existent device is OK */
			mdfd = open_mddev(devlist->devname, 0);
		if (mdfd == -2) {
			pr_err("device %s exists but is not an md array.\n", devlist->devname);
			exit(1);
		}
		if ((int)ident.super_minor == -2) {
			struct stat stb;
			if (mdfd < 0) {
				pr_err("--super-minor=dev given, and listed device %s doesn't exist.\n",
					devlist->devname);
				exit(1);
			}
			fstat(mdfd, &stb);
			ident.super_minor = minor(stb.st_rdev);
		}
		if (mdfd >= 0 && mode != MANAGE && mode != GROW) {
			/* We don't really want this open yet, we just might
			 * have wanted to check some things
			 */
			close(mdfd);
			mdfd = -1;
		}
	}

	if (s.raiddisks) {
		if (s.raiddisks == 1 &&  !c.force && s.level != LEVEL_FAULTY) {
			pr_err("'1' is an unusual number of drives for an array, so it is probably\n"
				"     a mistake.  If you really mean it you will need to specify --force before\n"
				"     setting the number of drives.\n");
			exit(2);
		}
	}

	if (c.homehost == NULL && c.require_homehost)
		c.homehost = conf_get_homehost(&c.require_homehost);
	if (c.homehost == NULL || strcasecmp(c.homehost, "<system>") == 0) {
		if (gethostname(sys_hostname, sizeof(sys_hostname)) == 0) {
			sys_hostname[sizeof(sys_hostname)-1] = 0;
			c.homehost = sys_hostname;
		}
	}
	if (c.homehost &&
	    (!c.homehost[0] || strcasecmp(c.homehost, "<none>") == 0)) {
		c.homehost = NULL;
		c.require_homehost = 0;
	}

	rv = 0;

	set_hooks(); /* set hooks from libs */

	if (c.homecluster == NULL && (c.nodes > 0)) {
		c.homecluster = conf_get_homecluster();
		if (c.homecluster == NULL)
			rv = get_cluster_name(&c.homecluster);
		if (rv) {
			pr_err("The md can't get cluster name\n");
			exit(1);
		}
	}

	if (c.backup_file && data_offset != INVALID_SECTORS) {
		pr_err("--backup-file and --data-offset are incompatible\n");
		exit(2);
	}

	if ((mode == MISC && devmode == 'E') ||
	    (mode == MONITOR && spare_sharing == 0))
		/* Anyone may try this */;
	else if (geteuid() != 0) {
		pr_err("must be super-user to perform this action\n");
		exit(1);
	}

	ident.autof = c.autof;

	if (c.scan && c.verbose < 2)
		/* --scan implied --brief unless -vv */
		c.brief = 1;

	if (mode == CREATE) {
		if (s.bitmap_file && strcmp(s.bitmap_file, "clustered") == 0) {
			locked = cluster_get_dlmlock();
			if (locked != 1)
				exit(1);
		}
	} else if (mode == MANAGE || mode == GROW || mode == INCREMENTAL) {
		if (!md_get_array_info(mdfd, &array) && (devmode != 'c')) {
			if (array.state & (1 << MD_SB_CLUSTERED)) {
				locked = cluster_get_dlmlock();
				if (locked != 1)
					exit(1);
			}
		}
	}

	switch(mode) {
	case MANAGE:
		/* readonly, add/remove, readwrite, runstop */
		if (c.readonly > 0)
			rv = Manage_ro(devlist->devname, mdfd, c.readonly);
		if (!rv && devs_found>1)
			rv = Manage_subdevs(devlist->devname, mdfd,
					    devlist->next, c.verbose, c.test,
					    c.update, c.force);
		if (!rv && c.readonly < 0)
			rv = Manage_ro(devlist->devname, mdfd, c.readonly);
		if (!rv && c.runstop > 0)
			rv = Manage_run(devlist->devname, mdfd, &c);
		if (!rv && c.runstop < 0)
			rv = Manage_stop(devlist->devname, mdfd, c.verbose, 0);
		break;
	case ASSEMBLE:
		if (devs_found == 1 && ident.uuid_set == 0 &&
		    ident.super_minor == UnSet && ident.name[0] == 0 &&
		    !c.scan ) {
			/* Only a device has been given, so get details from config file */
			struct mddev_ident *array_ident = conf_get_ident(devlist->devname);
			if (array_ident == NULL) {
				pr_err("%s not identified in config file.\n",
					devlist->devname);
				rv |= 1;
				if (mdfd >= 0)
					close(mdfd);
			} else {
				if (array_ident->autof == 0)
					array_ident->autof = c.autof;
				rv |= Assemble(ss, devlist->devname, array_ident,
					       NULL, &c);
			}
		} else if (!c.scan)
			rv = Assemble(ss, devlist->devname, &ident,
				      devlist->next, &c);
		else if (devs_found > 0) {
			if (c.update && devs_found > 1) {
				pr_err("can only update a single array at a time\n");
				exit(1);
			}
			if (c.backup_file && devs_found > 1) {
				pr_err("can only assemble a single array when providing a backup file.\n");
				exit(1);
			}
			for (dv = devlist; dv; dv = dv->next) {
				struct mddev_ident *array_ident = conf_get_ident(dv->devname);
				if (array_ident == NULL) {
					pr_err("%s not identified in config file.\n",
						dv->devname);
					rv |= 1;
					continue;
				}
				if (array_ident->autof == 0)
					array_ident->autof = c.autof;
				rv |= Assemble(ss, dv->devname, array_ident,
					       NULL, &c);
			}
		} else {
			if (c.update) {
				pr_err("--update not meaningful with a --scan assembly.\n");
				exit(1);
			}
			if (c.backup_file) {
				pr_err("--backup_file not meaningful with a --scan assembly.\n");
				exit(1);
			}
			rv = scan_assemble(ss, &c, &ident);
		}

		break;
	case BUILD:
		if (c.delay == 0)
			c.delay = DEFAULT_BITMAP_DELAY;
		if (s.write_behind && !s.bitmap_file) {
			pr_err("write-behind mode requires a bitmap.\n");
			rv = 1;
			break;
		}
		if (s.raiddisks == 0) {
			pr_err("no raid-devices specified.\n");
			rv = 1;
			break;
		}

		if (s.bitmap_file) {
			if (strcmp(s.bitmap_file, "internal") == 0 ||
			    strcmp(s.bitmap_file, "clustered") == 0) {
				pr_err("'internal' and 'clustered' bitmaps not supported with --build\n");
				rv |= 1;
				break;
			}
		}
		rv = Build(devlist->devname, devlist->next, &s, &c);
		break;
	case CREATE:
		if (c.delay == 0)
			c.delay = DEFAULT_BITMAP_DELAY;

		if (c.nodes) {
			if (!s.bitmap_file ||
			    strcmp(s.bitmap_file, "clustered") != 0) {
				pr_err("--nodes argument only compatible with --bitmap=clustered\n");
				rv = 1;
				break;
			}

			if (s.level != 1 && s.level != 10) {
				pr_err("--bitmap=clustered is currently supported with raid1/10 only\n");
				rv = 1;
				break;
			}
			if (s.level == 10 && !(is_near_layout_10(s.layout) || s.layout == UnSet)) {
				pr_err("only near layout is supported with clustered raid10\n");
				rv = 1;
				break;
			}
		}

		if (s.write_behind && !s.bitmap_file) {
			pr_err("write-behind mode requires a bitmap.\n");
			rv = 1;
			break;
		}
		if (s.raiddisks == 0) {
			pr_err("no raid-devices specified.\n");
			rv = 1;
			break;
		}

		rv = Create(ss, devlist->devname,
			    ident.name, ident.uuid_set ? ident.uuid : NULL,
			    devs_found-1, devlist->next,
			    &s, &c, data_offset);
		break;
	case MISC:
		if (devmode == 'E') {
			if (devlist == NULL && !c.scan) {
				pr_err("No devices to examine\n");
				exit(2);
			}
			if (devlist == NULL)
				devlist = conf_get_devs();
			if (devlist == NULL) {
				pr_err("No devices listed in %s\n", configfile?configfile:DefaultConfFile);
				exit(1);
			}
			rv = Examine(devlist, &c, ss);
		} else if (devmode == DetailPlatform) {
			rv = Detail_Platform(ss ? ss->ss : NULL, ss ? c.scan : 1,
					     c.verbose, c.export,
					     devlist ? devlist->devname : NULL);
		} else if (devlist == NULL) {
			if (devmode == 'S' && c.scan)
				rv = stop_scan(c.verbose);
			else if ((devmode == 'D' || devmode == Waitclean) &&
				 c.scan)
				rv = misc_scan(devmode, &c);
			else if (devmode == UdevRules)
				rv = Write_rules(udev_filename);
			else {
				pr_err("No devices given.\n");
				exit(2);
			}
		} else
			rv = misc_list(devlist, &ident, dump_directory, ss, &c);
		break;
	case MONITOR:
		if (!devlist && !c.scan) {
			pr_err("Cannot monitor: need --scan or at least one device\n");
			rv = 1;
			break;
		}
		if (pidfile && !daemonise) {
			pr_err("Cannot write a pid file when not in daemon mode\n");
			rv = 1;
			break;
		}
		if (c.delay == 0) {
			if (get_linux_version() > 2006016)
				/* mdstat responds to poll */
				c.delay = 1000;
			else
				c.delay = 60;
		}
		rv = Monitor(devlist, mailaddr, program,
			     &c, daemonise, oneshot,
			     dosyslog, pidfile, increments,
			     spare_sharing);
		break;

	case GROW:
		if (array_size > 0) {
			/* alway impose array size first, independent of
			 * anything else
			 * Do not allow level or raid_disks changes at the
			 * same time as that can be irreversibly destructive.
			 */
			struct mdinfo sra;
			int err;
			if (s.raiddisks || s.level != UnSet) {
				pr_err("cannot change array size in same operation as changing raiddisks or level.\n"
					"    Change size first, then check that data is still intact.\n");
				rv = 1;
				break;
			}
			if (sysfs_init(&sra, mdfd, NULL)) {
				rv = 1;
				break;
			}
			if (array_size == MAX_SIZE)
				err = sysfs_set_str(&sra, NULL, "array_size", "default");
			else
				err = sysfs_set_num(&sra, NULL, "array_size", array_size / 2);
			if (err < 0) {
				if (errno == E2BIG)
					pr_err("--array-size setting is too large.\n");
				else
					pr_err("current kernel does not support setting --array-size\n");
				rv = 1;
				break;
			}
		}
		if (devs_found > 1 && s.raiddisks == 0 && s.level == UnSet) {
			/* must be '-a'. */
			if (s.size > 0 || s.chunk ||
			    s.layout_str || s.bitmap_file) {
				pr_err("--add cannot be used with other geometry changes in --grow mode\n");
				rv = 1;
				break;
			}
			for (dv = devlist->next; dv; dv = dv->next) {
				rv = Grow_Add_device(devlist->devname, mdfd,
						     dv->devname);
				if (rv)
					break;
			}
		} else if (s.bitmap_file) {
			if (s.size > 0 || s.raiddisks || s.chunk ||
			    s.layout_str || devs_found > 1) {
				pr_err("--bitmap changes cannot be used with other geometry changes in --grow mode\n");
				rv = 1;
				break;
			}
			if (c.delay == 0)
				c.delay = DEFAULT_BITMAP_DELAY;
			rv = Grow_addbitmap(devlist->devname, mdfd, &c, &s);
		} else if (grow_continue)
			rv = Grow_continue_command(devlist->devname,
						   mdfd, c.backup_file,
						   c.verbose);
		else if (s.size > 0 || s.raiddisks || s.layout_str ||
			 s.chunk != 0 || s.level != UnSet ||
			 data_offset != INVALID_SECTORS) {
			rv = Grow_reshape(devlist->devname, mdfd,
					  devlist->next,
					  data_offset, &c, &s);
		} else if (s.consistency_policy != CONSISTENCY_POLICY_UNKNOWN) {
			rv = Grow_consistency_policy(devlist->devname, mdfd, &c, &s);
		} else if (array_size == 0)
			pr_err("no changes to --grow\n");
		break;
	case INCREMENTAL:
		if (rebuild_map) {
			RebuildMap();
		}
		if (c.scan) {
			rv = 1;
			if (devlist) {
				pr_err("In --incremental mode, a device cannot be given with --scan.\n");
				break;
			}
			if (c.runstop <= 0) {
				pr_err("--incremental --scan meaningless without --run.\n");
				break;
			}
			if (devmode == 'f') {
				pr_err("--incremental --scan --fail not supported.\n");
				break;
			}
			rv = IncrementalScan(&c, NULL);
		}
		if (!devlist) {
			if (!rebuild_map && !c.scan) {
				pr_err("--incremental requires a device.\n");
				rv = 1;
			}
			break;
		}
		if (devmode == 'f') {
			if (devlist->next) {
				pr_err("'--incremental --fail' can only handle one device.\n");
				rv = 1;
				break;
			}
			rv = IncrementalRemove(devlist->devname, remove_path,
					       c.verbose);
		} else
			rv = Incremental(devlist, &c, ss);
		break;
	case AUTODETECT:
		autodetect();
		break;
	}
	if (locked)
		cluster_release_dlmlock();
	if (mdfd > 0)
		close(mdfd);
	exit(rv);
}

static int scan_assemble(struct supertype *ss,
			 struct context *c,
			 struct mddev_ident *ident)
{
	struct mddev_ident *a, *array_list =  conf_get_ident(NULL);
	struct mddev_dev *devlist = conf_get_devs();
	struct map_ent *map = NULL;
	int cnt = 0;
	int rv = 0;
	int failures, successes;

	if (conf_verify_devnames(array_list)) {
		pr_err("Duplicate MD device names in conf file were found.\n");
		return 1;
	}
	if (devlist == NULL) {
		pr_err("No devices listed in conf file were found.\n");
		return 1;
	}
	for (a = array_list; a; a = a->next) {
		a->assembled = 0;
		if (a->autof == 0)
			a->autof = c->autof;
	}
	if (map_lock(&map))
		pr_err("failed to get exclusive lock on mapfile\n");
	do {
		failures = 0;
		successes = 0;
		rv = 0;
		for (a = array_list; a; a = a->next) {
			int r;
			if (a->assembled)
				continue;
			if (a->devname &&
			    strcasecmp(a->devname, "<ignore>") == 0)
				continue;

			r = Assemble(ss, a->devname,
				     a, NULL, c);
			if (r == 0) {
				a->assembled = 1;
				successes++;
			} else
				failures++;
			rv |= r;
			cnt++;
		}
	} while (failures && successes);
	if (c->homehost && cnt == 0) {
		/* Maybe we can auto-assemble something.
		 * Repeatedly call Assemble in auto-assemble mode
		 * until it fails
		 */
		int rv2;
		int acnt;
		ident->autof = c->autof;
		do {
			struct mddev_dev *devlist = conf_get_devs();
			acnt = 0;
			do {
				rv2 = Assemble(ss, NULL,
					       ident,
					       devlist, c);
				if (rv2 == 0) {
					cnt++;
					acnt++;
				}
			} while (rv2 != 2);
			/* Incase there are stacked devices, we need to go around again */
		} while (acnt);
		if (cnt == 0 && rv == 0) {
			pr_err("No arrays found in config file or automatically\n");
			rv = 1;
		} else if (cnt)
			rv = 0;
	} else if (cnt == 0 && rv == 0) {
		pr_err("No arrays found in config file\n");
		rv = 1;
	}
	map_unlock(&map);
	return rv;
}

static int misc_scan(char devmode, struct context *c)
{
	/* apply --detail or --wait-clean to
	 * all devices in /proc/mdstat
	 */
	struct mdstat_ent *ms = mdstat_read(0, 1);
	struct mdstat_ent *e;
	struct map_ent *map = NULL;
	int members;
	int rv = 0;

	for (members = 0; members <= 1; members++) {
		for (e = ms; e; e = e->next) {
			char *name = NULL;
			struct map_ent *me;
			struct stat stb;
			int member = e->metadata_version &&
				strncmp(e->metadata_version,
					"external:/", 10) == 0;
			if (members != member)
				continue;
			me = map_by_devnm(&map, e->devnm);
			if (me && me->path && strcmp(me->path, "/unknown") != 0)
				name = me->path;
			if (name == NULL || stat(name, &stb) != 0)
				name = get_md_name(e->devnm);

			if (!name) {
				pr_err("cannot find device file for %s\n",
					e->devnm);
				continue;
			}
			if (devmode == 'D')
				rv |= Detail(name, c);
			else
				rv |= WaitClean(name, c->verbose);
			put_md_name(name);
			map_free(map);
			map = NULL;
		}
	}
	free_mdstat(ms);
	return rv;
}

static int stop_scan(int verbose)
{
	/* apply --stop to all devices in /proc/mdstat */
	/* Due to possible stacking of devices, repeat until
	 * nothing more can be stopped
	 */
	int progress = 1, err;
	int last = 0;
	int rv = 0;
	do {
		struct mdstat_ent *ms = mdstat_read(0, 0);
		struct mdstat_ent *e;

		if (!progress) last = 1;
		progress = 0; err = 0;
		for (e = ms; e; e = e->next) {
			char *name = get_md_name(e->devnm);
			int mdfd;

			if (!name) {
				pr_err("cannot find device file for %s\n",
					e->devnm);
				continue;
			}
			mdfd = open_mddev(name, 1);
			if (mdfd >= 0) {
				if (Manage_stop(name, mdfd, verbose, !last))
					err = 1;
				else
					progress = 1;
				close(mdfd);
			}

			put_md_name(name);
		}
		free_mdstat(ms);
	} while (!last && err);
	if (err)
		rv |= 1;
	return rv;
}

static int misc_list(struct mddev_dev *devlist,
		     struct mddev_ident *ident,
		     char *dump_directory,
		     struct supertype *ss, struct context *c)
{
	struct mddev_dev *dv;
	int rv = 0;

	for (dv = devlist; dv; dv = (rv & 16) ? NULL : dv->next) {
		int mdfd = -1;

		switch(dv->disposition) {
		case 'D':
			rv |= Detail(dv->devname, c);
			continue;
		case KillOpt: /* Zero superblock */
			if (ss)
				rv |= Kill(dv->devname, ss, c->force, c->verbose,0);
			else {
				int v = c->verbose;
				do {
					rv |= Kill(dv->devname, NULL, c->force, v, 0);
					v = -1;
				} while (rv == 0);
				rv &= ~4;
			}
			continue;
		case 'Q':
			rv |= Query(dv->devname);
			continue;
		case 'X':
			rv |= ExamineBitmap(dv->devname, c->brief, ss);
			continue;
		case ExamineBB:
			rv |= ExamineBadblocks(dv->devname, c->brief, ss);
			continue;
		case 'W':
		case WaitOpt:
			rv |= Wait(dv->devname);
			continue;
		case Waitclean:
			rv |= WaitClean(dv->devname, c->verbose);
			continue;
		case KillSubarray:
			rv |= Kill_subarray(dv->devname, c->subarray, c->verbose);
			continue;
		case UpdateSubarray:
			if (c->update == NULL) {
				pr_err("-U/--update must be specified with --update-subarray\n");
				rv |= 1;
				continue;
			}
			rv |= Update_subarray(dv->devname, c->subarray,
					      c->update, ident, c->verbose);
			continue;
		case Dump:
			rv |= Dump_metadata(dv->devname, dump_directory, c, ss);
			continue;
		case Restore:
			rv |= Restore_metadata(dv->devname, dump_directory, c, ss,
					       (dv == devlist && dv->next == NULL));
			continue;
		case Action:
			rv |= SetAction(dv->devname, c->action);
			continue;
		}

		if (dv->devname[0] != '/')
			mdfd = open_dev(dv->devname);
		if (dv->devname[0] == '/' || mdfd < 0)
			mdfd = open_mddev(dv->devname, 1);

		if (mdfd >= 0) {
			switch(dv->disposition) {
			case 'R':
				c->runstop = 1;
				rv |= Manage_run(dv->devname, mdfd, c);
				break;
			case 'S':
				rv |= Manage_stop(dv->devname, mdfd, c->verbose, 0);
				break;
			case 'o':
				rv |= Manage_ro(dv->devname, mdfd, 1);
				break;
			case 'w':
				rv |= Manage_ro(dv->devname, mdfd, -1);
				break;
			}
			close(mdfd);
		} else
			rv |= 1;
	}
	return rv;
}

int SetAction(char *dev, char *action)
{
	int fd = open(dev, O_RDONLY);
	struct mdinfo mdi;
	int retval;

	if (fd < 0) {
		pr_err("Couldn't open %s: %s\n", dev, strerror(errno));
		return 1;
	}
	retval = sysfs_init(&mdi, fd, NULL);
	close(fd);
	if (retval) {
		pr_err("%s is no an md array\n", dev);
		return 1;
	}

	if (sysfs_set_str(&mdi, NULL, "sync_action", action) < 0) {
		pr_err("Count not set action for %s to %s: %s\n",
		       dev, action, strerror(errno));
		return 1;
	}
	return 0;
}