Adding upstream version 4.3.upstream/4.3

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1358 insertions, 0 deletions

diff --git a/config.c b/config.c
new file mode 100644
index 0000000..44f7dd2
--- /dev/null
+++ b/config.c
@@ -0,0 +1,1358 @@
+/*
+ * mdadm - manage Linux "md" devices aka RAID arrays.
+ *
+ * Copyright (C) 2001-2009 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>
+ */
+
+#include	"mdadm.h"
+#include	"dlink.h"
+#include	<dirent.h>
+#include	<glob.h>
+#include	<fnmatch.h>
+#include	<ctype.h>
+#include	<pwd.h>
+#include	<grp.h>
+
+/*
+ * Read the config file
+ *
+ * conf_get_uuids gets a list of devicename+uuid pairs
+ * conf_get_devs gets device names after expanding wildcards
+ *
+ * Each keeps the returned list and frees it when asked to make
+ * a new list.
+ *
+ * The format of the config file needs to be fairly extensible.
+ * Now, arrays only have names and uuids and devices merely are.
+ * But later arrays might want names, and devices might want superblock
+ * versions, and who knows what else.
+ * I like free format, abhore backslash line continuation, adore
+ *   indentation for structure and am ok about # comments.
+ *
+ * So, each line that isn't blank or a #comment must either start
+ *  with a key word, and not be indented, or must start with a
+ *  non-key-word and must be indented.
+ *
+ * Keywords are DEVICE and ARRAY ... and several others.
+ * DEV{ICE} introduces some devices that might contain raid components.
+ * e.g.
+ *   DEV style=0 /dev/sda* /dev/hd*
+ *   DEV style=1 /dev/sd[b-f]*
+ * ARR{AY} describes an array giving md device and attributes like uuid=whatever
+ * e.g.
+ *   ARRAY /dev/md0 uuid=whatever name=something
+ * Spaces separate words on each line.  Quoting, with "" or '' protects them,
+ * but may not wrap over lines
+ *
+ */
+#ifndef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200809L
+#endif
+
+#ifndef CONFFILE
+#define CONFFILE "/etc/mdadm.conf"
+#endif
+#ifndef CONFFILE2
+/* for Debian compatibility .... */
+#define CONFFILE2 "/etc/mdadm/mdadm.conf"
+#endif
+char DefaultConfFile[] = CONFFILE;
+char DefaultConfDir[] = CONFFILE ".d";
+char DefaultAltConfFile[] = CONFFILE2;
+char DefaultAltConfDir[] = CONFFILE2 ".d";
+
+enum linetype { Devices, Array, Mailaddr, Mailfrom, Program, CreateDev,
+		Homehost, HomeCluster, AutoMode, Policy, PartPolicy, Sysfs,
+		MonitorDelay, LTEnd };
+char *keywords[] = {
+	[Devices]  = "devices",
+	[Array]    = "array",
+	[Mailaddr] = "mailaddr",
+	[Mailfrom] = "mailfrom",
+	[Program]  = "program",
+	[CreateDev]= "create",
+	[Homehost] = "homehost",
+	[HomeCluster] = "homecluster",
+	[AutoMode] = "auto",
+	[Policy]   = "policy",
+	[PartPolicy]="part-policy",
+	[Sysfs]    = "sysfs",
+	[MonitorDelay] = "monitordelay",
+	[LTEnd]    = NULL
+};
+
+/*
+ * match_keyword returns an index into the keywords array, or -1 for no match
+ * case is ignored, and at least three characters must be given
+ */
+
+int match_keyword(char *word)
+{
+	int len = strlen(word);
+	int n;
+
+	if (len < 3)
+		return -1;
+	for (n = 0; keywords[n]; n++) {
+		if (strncasecmp(word, keywords[n], len) == 0)
+			return n;
+	}
+
+	return -1;
+}
+
+/**
+ * is_devname_ignore() - check if &devname is a special "<ignore>" keyword.
+ */
+bool is_devname_ignore(const char *devname)
+{
+	static const char keyword[] = "<ignore>";
+
+	if (strcasecmp(devname, keyword) == 0)
+		return true;
+	return false;
+}
+
+/**
+ * ident_log() - generate and write message to the user.
+ * @param_name: name of the property.
+ * @value: value of the property.
+ * @reason: meaningful description.
+ * @cmdline: context dependent actions, see below.
+ *
+ * The function is made to provide similar error handling for both config and cmdline. The behavior
+ * is configurable via @cmdline. Message has following format:
+ * "Value "@value" cannot be set for @param_name. Reason: @reason."
+ *
+ * If cmdline is on:
+ * - message is written to stderr.
+ * otherwise:
+ * - message is written to stdout.
+ * - "Value ignored" is added at the end of the message.
+ */
+static void ident_log(const char *param_name, const char *value, const char *reason,
+		      const bool cmdline)
+{
+	if (cmdline == true)
+		pr_err("Value \"%s\" cannot be set as %s. Reason: %s.\n", value, param_name,
+		       reason);
+	else
+		pr_info("Value \"%s\" cannot be set as %s. Reason: %s. Value ignored.\n", value,
+			param_name, reason);
+}
+
+/**
+ * ident_init() - Set defaults.
+ * @ident: ident pointer, not NULL.
+ */
+inline void ident_init(struct mddev_ident *ident)
+{
+	assert(ident);
+
+	ident->assembled = false;
+	ident->autof = 0;
+	ident->bitmap_fd = -1;
+	ident->bitmap_file = NULL;
+	ident->container = NULL;
+	ident->devices = NULL;
+	ident->devname = NULL;
+	ident->level = UnSet;
+	ident->member = NULL;
+	ident->name[0] = 0;
+	ident->next = NULL;
+	ident->raid_disks = UnSet;
+	ident->spare_group = NULL;
+	ident->spare_disks = 0;
+	ident->st = NULL;
+	ident->super_minor = UnSet;
+	ident->uuid[0] = 0;
+	ident->uuid_set = 0;
+}
+
+/**
+ * _ident_set_devname()- verify devname and set it in &mddev_ident.
+ * @ident: pointer to &mddev_ident.
+ * @devname: devname to be set.
+ * @cmdline: context dependent actions. If set, ignore keyword is not allowed.
+ *
+ * @devname can have following forms:
+ *	'<ignore>' keyword (if allowed)
+ *	/dev/md{number}
+ *	/dev/md_d{number} (legacy)
+ *	/dev/md_{name}
+ *	/dev/md/{name}
+ *	{name}
+ *
+ * {name} must follow name's criteria and be POSIX compatible.
+ * If criteria passed, duplicate memory and set devname in @ident.
+ *
+ * Return: %MDADM_STATUS_SUCCESS or %MDADM_STATUS_ERROR.
+ */
+mdadm_status_t _ident_set_devname(struct mddev_ident *ident, const char *devname,
+				  const bool cmdline)
+{
+	assert(ident);
+	assert(devname);
+
+	static const char named_dev_pref[] = DEV_NUM_PREF "_";
+	static const int named_dev_pref_size = sizeof(named_dev_pref) - 1;
+	const char *prop_name = "devname";
+	const char *name;
+
+	if (ident->devname) {
+		ident_log(prop_name, devname, "Already defined", cmdline);
+		return MDADM_STATUS_ERROR;
+	}
+
+	if (is_devname_ignore(devname) == true) {
+		if (!cmdline)
+			goto pass;
+
+		ident_log(prop_name, devname, "Special keyword is invalid in this context",
+			  cmdline);
+		return MDADM_STATUS_ERROR;
+	}
+
+	if (is_devname_md_numbered(devname) == true || is_devname_md_d_numbered(devname) == true)
+		goto pass;
+
+	if (strncmp(devname, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0)
+		name = devname + DEV_MD_DIR_LEN;
+	else if (strncmp(devname, named_dev_pref, named_dev_pref_size) == 0)
+		name = devname + named_dev_pref_size;
+	else
+		name = devname;
+
+	if (is_name_posix_compatible(name) == false) {
+		ident_log(prop_name, name, "Not POSIX compatible", cmdline);
+		return MDADM_STATUS_ERROR;
+	}
+
+	if (is_string_lq(name, MD_NAME_MAX + 1) == false) {
+		ident_log(prop_name, devname, "Invalid length", cmdline);
+		return MDADM_STATUS_ERROR;
+	}
+pass:
+	ident->devname = xstrdup(devname);
+	return MDADM_STATUS_SUCCESS;
+}
+
+/**
+ * _ident_set_name()- set name in &mddev_ident.
+ * @ident: pointer to &mddev_ident.
+ * @name: name to be set.
+ * @cmdline: context dependent actions.
+ *
+ * If criteria passed, set name in @ident.
+ * Note: name is not used by config file, it for cmdline only.
+ *
+ * Return: %MDADM_STATUS_SUCCESS or %MDADM_STATUS_ERROR.
+ */
+static mdadm_status_t _ident_set_name(struct mddev_ident *ident, const char *name,
+				      const bool cmdline)
+{
+	assert(name);
+	assert(ident);
+
+	const char *prop_name = "name";
+
+	if (ident->name[0]) {
+		ident_log(prop_name, name, "Already defined", cmdline);
+		return MDADM_STATUS_ERROR;
+	}
+
+	if (is_string_lq(name, MD_NAME_MAX + 1) == false) {
+		ident_log(prop_name, name, "Too long or empty", cmdline);
+		return MDADM_STATUS_ERROR;
+	}
+
+	if (is_name_posix_compatible(name) == false) {
+		ident_log(prop_name, name, "Not POSIX compatible", cmdline);
+		return MDADM_STATUS_ERROR;
+	}
+
+	snprintf(ident->name, MD_NAME_MAX + 1, "%s", name);
+	return MDADM_STATUS_SUCCESS;
+}
+
+/**
+ * ident_set_devname()- exported, for cmdline.
+ */
+mdadm_status_t ident_set_devname(struct mddev_ident *ident, const char *name)
+{
+	return _ident_set_devname(ident, name, true);
+}
+
+/**
+ * ident_set_name()- exported, for cmdline.
+ */
+mdadm_status_t ident_set_name(struct mddev_ident *ident, const char *name)
+{
+	return _ident_set_name(ident, name, true);
+}
+
+struct conf_dev {
+	struct conf_dev *next;
+	char *name;
+} *cdevlist = NULL;
+
+struct mddev_dev *load_partitions(void)
+{
+	FILE *f = fopen("/proc/partitions", "r");
+	char buf[1024];
+	struct mddev_dev *rv = NULL;
+
+	if (f == NULL) {
+		pr_err("cannot open /proc/partitions\n");
+		return NULL;
+	}
+	while (fgets(buf, 1024, f)) {
+		int major, minor;
+		char *name, *mp;
+		struct mddev_dev *d;
+
+		buf[1023] = '\0';
+		if (buf[0] != ' ')
+			continue;
+		major = strtoul(buf, &mp, 10);
+		if (mp == buf || *mp != ' ')
+			continue;
+		minor = strtoul(mp, NULL, 10);
+
+		name = map_dev(major, minor, 1);
+		if (!name)
+			continue;
+		d = xcalloc(1, sizeof(*d));
+		d->devname = xstrdup(name);
+		d->next = rv;
+		rv = d;
+	}
+	fclose(f);
+	return rv;
+}
+
+struct mddev_dev *load_containers(void)
+{
+	struct mdstat_ent *mdstat = mdstat_read(0, 0);
+	struct mdstat_ent *ent;
+	struct mddev_dev *d;
+	struct mddev_dev *rv = NULL;
+	struct map_ent *map = NULL, *me;
+
+	if (!mdstat)
+		return NULL;
+
+	for (ent = mdstat; ent; ent = ent->next)
+		if (ent->metadata_version &&
+		    strncmp(ent->metadata_version, "external:", 9) == 0 &&
+		    !is_subarray(&ent->metadata_version[9])) {
+			d = xcalloc(1, sizeof(*d));
+			me = map_by_devnm(&map, ent->devnm);
+			if (me)
+				d->devname = xstrdup(me->path);
+			else if (asprintf(&d->devname, "/dev/%s", ent->devnm) < 0) {
+				free(d);
+				continue;
+			}
+			d->next = rv;
+			rv = d;
+			map_free(map);
+			map = NULL;
+		}
+	free_mdstat(mdstat);
+
+	return rv;
+}
+
+struct createinfo createinfo = {
+	.autof = 2, /* by default, create devices with standard names */
+	.names = 0, /* By default, stick with numbered md devices. */
+	.bblist = 1, /* Use a bad block list by default */
+#ifdef DEBIAN
+	.gid = 6, /* disk */
+	.mode = 0660,
+#else
+	.mode = 0600,
+#endif
+};
+
+int parse_auto(char *str, char *msg, int config)
+{
+	int autof;
+	if (str == NULL || *str == 0)
+		autof = 2;
+	else if (strcasecmp(str, "no") == 0)
+		autof = 1;
+	else if (strcasecmp(str, "yes") == 0)
+		autof = 2;
+	else if (strcasecmp(str, "md") == 0)
+		autof = config ? 5:3;
+	else {
+		/* There might be digits, and maybe a hypen, at the end */
+		char *e = str + strlen(str);
+		int num = 4;
+		int len;
+		while (e > str && isdigit(e[-1]))
+			e--;
+		if (*e) {
+			num = atoi(e);
+			if (num <= 0)
+				num = 1;
+		}
+		if (e > str && e[-1] == '-')
+			e--;
+		len = e - str;
+		if ((len == 2 && strncasecmp(str, "md", 2) == 0)) {
+			autof = config ? 5 : 3;
+		} else if ((len == 3 && strncasecmp(str, "yes", 3) == 0)) {
+			autof = 2;
+		} else if ((len == 3 && strncasecmp(str, "mdp", 3) == 0)) {
+			autof = config ? 6 : 4;
+		} else if ((len == 1 && strncasecmp(str, "p", 1) == 0) ||
+			   (len >= 4 && strncasecmp(str, "part", 4) == 0)) {
+			autof = 6;
+		} else {
+			pr_err("%s arg of \"%s\" unrecognised: use no,yes,md,mdp,part\n"
+				"        optionally followed by a number.\n",
+				msg, str);
+			exit(2);
+		}
+		autof |= num << 3;
+	}
+	return autof;
+}
+
+static void createline(char *line)
+{
+	char *w;
+	char *ep;
+
+	for (w = dl_next(line); w != line; w = dl_next(w)) {
+		if (strncasecmp(w, "auto=", 5) == 0)
+			createinfo.autof = parse_auto(w + 5, "auto=", 1);
+		else if (strncasecmp(w, "owner=", 6) == 0) {
+			if (w[6] == 0) {
+				pr_err("missing owner name\n");
+				continue;
+			}
+			createinfo.uid = strtoul(w + 6, &ep, 10);
+			if (*ep != 0) {
+				struct passwd *pw;
+				/* must be a name */
+				pw = getpwnam(w + 6);
+				if (pw)
+					createinfo.uid = pw->pw_uid;
+				else
+					pr_err("CREATE user %s not found\n",
+					       w + 6);
+			}
+		} else if (strncasecmp(w, "group=", 6) == 0) {
+			if (w[6] == 0) {
+				pr_err("missing group name\n");
+				continue;
+			}
+			createinfo.gid = strtoul(w + 6, &ep, 10);
+			if (*ep != 0) {
+				struct group *gr;
+				/* must be a name */
+				gr = getgrnam(w + 6);
+				if (gr)
+					createinfo.gid = gr->gr_gid;
+				else
+					pr_err("CREATE group %s not found\n",
+					       w + 6);
+			}
+		} else if (strncasecmp(w, "mode=", 5) == 0) {
+			if (w[5] == 0) {
+				pr_err("missing CREATE mode\n");
+				continue;
+			}
+			createinfo.mode = strtoul(w + 5, &ep, 8);
+			if (*ep != 0) {
+				createinfo.mode = 0600;
+				pr_err("unrecognised CREATE mode %s\n",
+					w + 5);
+			}
+		} else if (strncasecmp(w, "metadata=", 9) == 0) {
+			/* style of metadata to use by default */
+			int i;
+			for (i = 0; superlist[i] && !createinfo.supertype; i++)
+				createinfo.supertype = superlist[i]->match_metadata_desc(w + 9);
+			if (!createinfo.supertype)
+				pr_err("metadata format %s unknown, ignoring\n",
+					w+9);
+		} else if (strncasecmp(w, "names=yes", 12) == 0)
+			createinfo.names = 1;
+		else if  (strncasecmp(w, "names=no", 11) == 0)
+			createinfo.names = 0;
+		else if  (strncasecmp(w, "bbl=no", 11) == 0)
+			createinfo.bblist = 0;
+		else if  (strncasecmp(w, "bbl=yes", 11) == 0)
+			createinfo.bblist = 1;
+		else {
+			pr_err("unrecognised word on CREATE line: %s\n",
+				w);
+		}
+	}
+}
+
+void devline(char *line)
+{
+	char *w;
+	struct conf_dev *cd;
+
+	for (w = dl_next(line); w != line; w = dl_next(w)) {
+		if (w[0] == '/' || strcasecmp(w, "partitions") == 0 ||
+		    strcasecmp(w, "containers") == 0) {
+			cd = xmalloc(sizeof(*cd));
+			cd->name = xstrdup(w);
+			cd->next = cdevlist;
+			cdevlist = cd;
+		} else {
+			pr_err("unreconised word on DEVICE line: %s\n", w);
+		}
+	}
+}
+
+struct mddev_ident *mddevlist = NULL;
+struct mddev_ident **mddevlp = &mddevlist;
+
+void arrayline(char *line)
+{
+	char *w;
+
+	struct mddev_ident mis;
+	struct mddev_ident *mi;
+
+	ident_init(&mis);
+
+	for (w = dl_next(line); w != line; w = dl_next(w)) {
+		if (w[0] == '/' || strchr(w, '=') == NULL) {
+			_ident_set_devname(&mis, w, false);
+		} else if (strncasecmp(w, "uuid=", 5) == 0) {
+			if (mis.uuid_set)
+				pr_err("only specify uuid once, %s ignored.\n",
+				       w);
+			else {
+				if (parse_uuid(w + 5, mis.uuid))
+					mis.uuid_set = 1;
+				else
+					pr_err("bad uuid: %s\n", w);
+			}
+		} else if (strncasecmp(w, "super-minor=", 12) == 0) {
+			if (mis.super_minor != UnSet)
+				pr_err("only specify super-minor once, %s ignored.\n",
+					w);
+			else {
+				char *endptr;
+				int minor = strtol(w + 12, &endptr, 10);
+
+				if (w[12] == 0 || endptr[0] != 0 || minor < 0)
+					pr_err("invalid super-minor number: %s\n",
+					       w);
+				else
+					mis.super_minor = minor;
+			}
+		} else if (strncasecmp(w, "name=", 5) == 0) {
+			/* Ignore name in confile */
+			continue;
+		} else if (strncasecmp(w, "bitmap=", 7) == 0) {
+			if (mis.bitmap_file)
+				pr_err("only specify bitmap file once. %s ignored\n",
+					w);
+			else
+				mis.bitmap_file = xstrdup(w + 7);
+
+		} else if (strncasecmp(w, "devices=", 8 ) == 0) {
+			if (mis.devices)
+				pr_err("only specify devices once (use a comma separated list). %s ignored\n",
+					w);
+			else
+				mis.devices = xstrdup(w + 8);
+		} else if (strncasecmp(w, "spare-group=", 12) == 0) {
+			if (mis.spare_group)
+				pr_err("only specify one spare group per array. %s ignored.\n",
+					w);
+			else
+				mis.spare_group = xstrdup(w + 12);
+		} else if (strncasecmp(w, "level=", 6) == 0 ) {
+			/* this is mainly for compatability with --brief output */
+			mis.level = map_name(pers, w + 6);
+		} else if (strncasecmp(w, "disks=", 6) == 0) {
+			/* again, for compat */
+			mis.raid_disks = atoi(w + 6);
+		} else if (strncasecmp(w, "num-devices=", 12) == 0) {
+			/* again, for compat */
+			mis.raid_disks = atoi(w + 12);
+		} else if (strncasecmp(w, "spares=", 7) == 0) {
+			/* for warning if not all spares present */
+			mis.spare_disks = atoi(w + 7);
+		} else if (strncasecmp(w, "metadata=", 9) == 0) {
+			/* style of metadata on the devices. */
+			int i;
+
+			for(i=0; superlist[i] && !mis.st; i++)
+				mis.st = superlist[i]->
+					match_metadata_desc(w + 9);
+
+			if (!mis.st)
+				pr_err("metadata format %s unknown, ignored.\n",
+				       w + 9);
+		} else if (strncasecmp(w, "auto=", 5) == 0 ) {
+			/* whether to create device special files as needed */
+			mis.autof = parse_auto(w + 5, "auto type", 0);
+		} else if (strncasecmp(w, "member=", 7) == 0) {
+			/* subarray within a container */
+			mis.member = xstrdup(w + 7);
+		} else if (strncasecmp(w, "container=", 10) == 0) {
+			/* The container holding this subarray.
+			 * Either a device name or a uuid */
+			mis.container = xstrdup(w + 10);
+		} else {
+			pr_err("unrecognised word on ARRAY line: %s\n",
+				w);
+		}
+	}
+	if (mis.uuid_set == 0 && mis.devices == NULL &&
+	    mis.super_minor == UnSet && mis.name[0] == 0 &&
+	    (mis.container == NULL || mis.member == NULL))
+		pr_err("ARRAY line %s has no identity information.\n",
+		       mis.devname);
+	else {
+		mi = xmalloc(sizeof(*mi));
+		*mi = mis;
+		mi->devname = mis.devname ? xstrdup(mis.devname) : NULL;
+		mi->next = NULL;
+		*mddevlp = mi;
+		mddevlp = &mi->next;
+	}
+}
+
+static char *alert_email = NULL;
+void mailline(char *line)
+{
+	char *w;
+
+	for (w = dl_next(line); w != line; w = dl_next(w))
+		if (alert_email == NULL)
+			alert_email = xstrdup(w);
+}
+
+static char *alert_mail_from = NULL;
+void mailfromline(char *line)
+{
+	char *w;
+
+	for (w = dl_next(line); w != line; w = dl_next(w)) {
+		if (alert_mail_from == NULL)
+			alert_mail_from = xstrdup(w);
+		else {
+			char *t = NULL;
+
+			if (xasprintf(&t, "%s %s", alert_mail_from, w) > 0) {
+				free(alert_mail_from);
+				alert_mail_from = t;
+			}
+		}
+	}
+}
+
+static char *alert_program = NULL;
+void programline(char *line)
+{
+	char *w;
+
+	for (w = dl_next(line); w != line; w = dl_next(w))
+		if (alert_program == NULL)
+			alert_program = xstrdup(w);
+}
+
+static char *home_host = NULL;
+static int require_homehost = 1;
+void homehostline(char *line)
+{
+	char *w;
+
+	for (w = dl_next(line); w != line; w = dl_next(w)) {
+		if (is_devname_ignore(w) == true)
+			require_homehost = 0;
+		else if (home_host == NULL) {
+			if (strcasecmp(w, "<none>") == 0)
+				home_host = xstrdup("");
+			else
+				home_host = xstrdup(w);
+		}
+	}
+}
+
+static char *home_cluster = NULL;
+void homeclusterline(char *line)
+{
+	char *w;
+
+	for (w = dl_next(line); w != line; w = dl_next(w)) {
+		if (home_cluster == NULL) {
+			if (strcasecmp(w, "<none>") == 0)
+				home_cluster = xstrdup("");
+			else
+				home_cluster = xstrdup(w);
+		}
+	}
+}
+
+static int monitor_delay;
+void monitordelayline(char *line)
+{
+	char *w;
+
+	for (w = dl_next(line); w != line; w = dl_next(w)) {
+		if (monitor_delay == 0)
+			monitor_delay = strtol(w, NULL, 10);
+	}
+}
+
+char auto_yes[] = "yes";
+char auto_no[] = "no";
+char auto_homehost[] = "homehost";
+
+static int auto_seen = 0;
+void autoline(char *line)
+{
+	char *w;
+	char *seen;
+	int super_cnt;
+	char *dflt = auto_yes;
+	int homehost = 0;
+	int i;
+
+	if (auto_seen)
+		return;
+	auto_seen = 1;
+
+	/*
+	 * Parse the 'auto' line creating policy statements for the 'auto'
+	 * policy.
+	 *
+	 * The default is 'yes' but the 'auto' line might over-ride that.
+	 * Words in the line are processed in order with the first
+	 * match winning.
+	 * word can be:
+	 *   +version   - that version can be assembled
+	 *   -version   - that version cannot be auto-assembled
+	 *   yes or +all - any other version can be assembled
+	 *   no or -all  - no other version can be assembled.
+	 *   homehost   - any array associated by 'homehost' to this
+	 *                host can be assembled.
+	 *
+	 * Thus:
+	 *   +ddf -0.90 homehost -all
+	 * will auto-assemble any ddf array, no 0.90 array, and
+	 * any other array (imsm, 1.x) if and only if it is identified
+	 * as belonging to this host.
+	 *
+	 * We translate that to policy by creating 'auto=yes' when we see
+	 * a '+version' line, 'auto=no' if we see '-version' before 'homehost',
+	 * or 'auto=homehost' if we see '-version' after 'homehost'.
+	 * When we see yes, no, +all or -all we stop and any version that hasn't
+	 * been seen gets an appropriate auto= entry.
+	 */
+
+	/*
+	 * If environment variable MDADM_CONF_AUTO is defined, then
+	 * it is prepended to the auto line.  This allow a script
+	 * to easily disable some metadata types.
+	 */
+	w = getenv("MDADM_CONF_AUTO");
+	if (w && *w) {
+		char *l = xstrdup(w);
+		char *head = line;
+		w = strtok(l, " \t");
+		while (w) {
+			char *nw = dl_strdup(w);
+			dl_insert(head, nw);
+			head = nw;
+			w = strtok(NULL, " \t");
+		}
+		free(l);
+	}
+
+	for (super_cnt = 0; superlist[super_cnt]; super_cnt++)
+		;
+	seen = xcalloc(super_cnt, 1);
+
+	for (w = dl_next(line); w != line; w = dl_next(w)) {
+		char *val;
+
+		if (strcasecmp(w, "yes") == 0) {
+			dflt = auto_yes;
+			break;
+		}
+		if (strcasecmp(w, "no") == 0) {
+			if (homehost)
+				dflt = auto_homehost;
+			else
+				dflt = auto_no;
+			break;
+		}
+		if (strcasecmp(w, "homehost") == 0) {
+			homehost = 1;
+			continue;
+		}
+		if (w[0] == '+')
+			val = auto_yes;
+		else if (w[0] == '-') {
+			if (homehost)
+				val = auto_homehost;
+			else
+				val = auto_no;
+		} else
+			continue;
+
+		if (strcasecmp(w + 1, "all") == 0) {
+			dflt = val;
+			break;
+		}
+		for (i = 0; superlist[i]; i++) {
+			const char *version = superlist[i]->name;
+			if (strcasecmp(w + 1, version) == 0)
+				break;
+			/* 1 matches 1.x, 0 matches 0.90 */
+			if (version[1] == '.' && strlen(w + 1) == 1 &&
+			    w[1] == version[0])
+				break;
+			/* 1.anything matches 1.x */
+			if (strcmp(version, "1.x") == 0 &&
+			    strncmp(w + 1, "1.", 2) == 0)
+				break;
+		}
+		if (superlist[i] == NULL)
+			/* ignore this word */
+			continue;
+		if (seen[i])
+			/* already know about this metadata */
+			continue;
+		policy_add(rule_policy, pol_auto, val, pol_metadata,
+			   superlist[i]->name, NULL);
+		seen[i] = 1;
+	}
+	for (i = 0; i < super_cnt; i++)
+		if (!seen[i])
+			policy_add(rule_policy, pol_auto, dflt, pol_metadata,
+				   superlist[i]->name, NULL);
+
+	free(seen);
+}
+
+int loaded = 0;
+
+static char *conffile = NULL;
+void set_conffile(char *file)
+{
+	conffile = file;
+}
+
+void conf_file(FILE *f)
+{
+	char *line;
+	while ((line = conf_line(f))) {
+		switch(match_keyword(line)) {
+		case Devices:
+			devline(line);
+			break;
+		case Array:
+			arrayline(line);
+			break;
+		case Mailaddr:
+			mailline(line);
+			break;
+		case Mailfrom:
+			mailfromline(line);
+			break;
+		case Program:
+			programline(line);
+			break;
+		case CreateDev:
+			createline(line);
+			break;
+		case Homehost:
+			homehostline(line);
+			break;
+		case HomeCluster:
+			homeclusterline(line);
+			break;
+		case AutoMode:
+			autoline(line);
+			break;
+		case Policy:
+			policyline(line, rule_policy);
+			break;
+		case PartPolicy:
+			policyline(line, rule_part);
+			break;
+		case Sysfs:
+			sysfsline(line);
+			break;
+		case MonitorDelay:
+			monitordelayline(line);
+			break;
+		default:
+			pr_err("Unknown keyword %s\n", line);
+		}
+		free_line(line);
+	}
+}
+
+struct fname {
+	struct fname *next;
+	char name[];
+};
+
+void conf_file_or_dir(FILE *f)
+{
+	struct stat st;
+	DIR *dir;
+	struct dirent *dp;
+	struct fname *list = NULL;
+
+	fstat(fileno(f), &st);
+	if (S_ISREG(st.st_mode))
+		conf_file(f);
+	else if (!S_ISDIR(st.st_mode))
+		return;
+#if _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
+	dir = fdopendir(fileno(f));
+	if (!dir)
+		return;
+	while ((dp = readdir(dir)) != NULL) {
+		int l;
+		struct fname *fn, **p;
+		if (dp->d_ino == 0)
+			continue;
+		if (dp->d_name[0] == '.')
+			continue;
+		l = strlen(dp->d_name);
+		if (l < 6 || strcmp(dp->d_name + l - 5, ".conf") != 0)
+			continue;
+		fn = xmalloc(sizeof(*fn) + l + 1);
+		strcpy(fn->name, dp->d_name);
+		for (p = &list;
+		     *p && strcmp((*p)->name, fn->name) < 0;
+		     p = & (*p)->next)
+			;
+		fn->next = *p;
+		*p = fn;
+	}
+	while (list) {
+		int fd;
+		FILE *f2;
+		struct fname *fn = list;
+		list = list->next;
+		fd = openat(fileno(f), fn->name, O_RDONLY);
+		free(fn);
+		if (fd < 0)
+			continue;
+		f2 = fdopen(fd, "r");
+		if (!f2) {
+			close(fd);
+			continue;
+		}
+		conf_file(f2);
+		fclose(f2);
+	}
+	closedir(dir);
+#endif
+}
+
+void load_conffile(void)
+{
+	FILE *f;
+	char *confdir = NULL;
+	char *head;
+
+	if (loaded)
+		return;
+	if (conffile == NULL) {
+		conffile = DefaultConfFile;
+		confdir = DefaultConfDir;
+	}
+
+	if (strcmp(conffile, "partitions") == 0) {
+		char *list = dl_strdup("DEV");
+		dl_init(list);
+		dl_add(list, dl_strdup("partitions"));
+		devline(list);
+		free_line(list);
+	} else if (str_is_none(conffile) == false) {
+		f = fopen(conffile, "r");
+		/* Debian chose to relocate mdadm.conf into /etc/mdadm/.
+		 * To allow Debian users to compile from clean source and still
+		 * have a working mdadm, we read /etc/mdadm/mdadm.conf
+		 * if /etc/mdadm.conf doesn't exist
+		 */
+		if (f == NULL && conffile == DefaultConfFile) {
+			f = fopen(DefaultAltConfFile, "r");
+			if (f) {
+				conffile = DefaultAltConfFile;
+				confdir = DefaultAltConfDir;
+			}
+		}
+		if (f) {
+			conf_file_or_dir(f);
+			fclose(f);
+		}
+		if (confdir) {
+			f = fopen(confdir, "r");
+			if (f) {
+				conf_file_or_dir(f);
+				fclose(f);
+			}
+		}
+	}
+	/* If there was no AUTO line, process an empty line
+	 * now so that the MDADM_CONF_AUTO env var gets processed.
+	 */
+	head = dl_strdup("AUTO");
+	dl_init(head);
+	autoline(head);
+	free_line(head);
+
+	loaded = 1;
+}
+
+char *conf_get_mailaddr(void)
+{
+	load_conffile();
+	return alert_email;
+}
+
+char *conf_get_mailfrom(void)
+{
+	load_conffile();
+	return alert_mail_from;
+}
+
+char *conf_get_program(void)
+{
+	load_conffile();
+	return alert_program;
+}
+
+char *conf_get_homehost(int *require_homehostp)
+{
+	load_conffile();
+	if (require_homehostp)
+		*require_homehostp = require_homehost;
+	return home_host;
+}
+
+char *conf_get_homecluster(void)
+{
+	load_conffile();
+	return home_cluster;
+}
+
+int conf_get_monitor_delay(void)
+{
+	load_conffile();
+	return monitor_delay;
+}
+
+struct createinfo *conf_get_create_info(void)
+{
+	load_conffile();
+	return &createinfo;
+}
+
+struct mddev_ident *conf_get_ident(char *dev)
+{
+	struct mddev_ident *rv;
+	load_conffile();
+	rv = mddevlist;
+	while (dev && rv && (rv->devname == NULL ||
+			     !devname_matches(dev, rv->devname)))
+		rv = rv->next;
+	return rv;
+}
+
+static void append_dlist(struct mddev_dev **dlp, struct mddev_dev *list)
+{
+	while (*dlp)
+		dlp = &(*dlp)->next;
+	*dlp = list;
+}
+
+struct mddev_dev *conf_get_devs()
+{
+	glob_t globbuf;
+	struct conf_dev *cd;
+	int flags = 0;
+	static struct mddev_dev *dlist = NULL;
+	unsigned int i;
+
+	while (dlist) {
+		struct mddev_dev *t = dlist;
+		dlist = dlist->next;
+		free(t->devname);
+		free(t);
+	}
+
+	load_conffile();
+
+	if (cdevlist == NULL) {
+		/* default to 'partitions' and 'containers' */
+		dlist = load_partitions();
+		append_dlist(&dlist, load_containers());
+	}
+
+	for (cd = cdevlist; cd; cd = cd->next) {
+		if (strcasecmp(cd->name, "partitions") == 0)
+			append_dlist(&dlist, load_partitions());
+		else if (strcasecmp(cd->name, "containers") == 0)
+			append_dlist(&dlist, load_containers());
+		else {
+			glob(cd->name, flags, NULL, &globbuf);
+			flags |= GLOB_APPEND;
+		}
+	}
+	if (flags & GLOB_APPEND) {
+		for (i = 0; i < globbuf.gl_pathc; i++) {
+			struct mddev_dev *t;
+			t = xcalloc(1, sizeof(*t));
+			t->devname = xstrdup(globbuf.gl_pathv[i]);
+			t->next = dlist;
+			dlist = t;
+/*	printf("one dev is %s\n", t->devname);*/
+		}
+		globfree(&globbuf);
+	}
+
+	return dlist;
+}
+
+int conf_test_dev(char *devname)
+{
+	struct conf_dev *cd;
+	if (cdevlist == NULL)
+		/* allow anything by default */
+		return 1;
+	for (cd = cdevlist; cd; cd = cd->next) {
+		if (strcasecmp(cd->name, "partitions") == 0)
+			return 1;
+		if (fnmatch(cd->name, devname, FNM_PATHNAME) == 0)
+			return 1;
+	}
+	return 0;
+}
+
+int conf_test_metadata(const char *version, struct dev_policy *pol, int is_homehost)
+{
+	/* If anyone said 'yes', that sticks.
+	 * else if homehost applies, use that
+	 * else if there is a 'no', say 'no'.
+	 * else 'yes'.
+	 */
+	struct dev_policy *p;
+	int no = 0, found_homehost = 0;
+	load_conffile();
+
+	pol = pol_find(pol, pol_auto);
+	pol_for_each(p, pol, version) {
+		if (strcmp(p->value, "yes") == 0)
+			return 1;
+		if (strcmp(p->value, "homehost") == 0)
+			found_homehost = 1;
+		if (strcmp(p->value, "no") == 0)
+			no = 1;
+	}
+	if (is_homehost && found_homehost)
+		return 1;
+	if (no)
+		return 0;
+	return 1;
+}
+
+int match_oneof(char *devices, char *devname)
+{
+	/* check if one of the comma separated patterns in devices
+	 * matches devname
+	 */
+
+	while (devices && *devices) {
+		char patn[1024];
+		char *p = devices;
+		devices = strchr(devices, ',');
+		if (!devices)
+			devices = p + strlen(p);
+		if (devices-p < 1024) {
+			strncpy(patn, p, devices - p);
+			patn[devices-p] = 0;
+			if (fnmatch(patn, devname, FNM_PATHNAME) == 0)
+				return 1;
+		}
+		if (*devices == ',')
+			devices++;
+	}
+	return 0;
+}
+
+int devname_matches(char *name, char *match)
+{
+	/* See if the given array name matches the
+	 * given match from config file.
+	 *
+	 * First strip and /dev/md/ or /dev/, then
+	 * see if there might be a numeric match of
+	 *  mdNN with NN
+	 * then just strcmp
+	 */
+	if (strncmp(name, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0)
+		name += DEV_MD_DIR_LEN;
+	else if (strncmp(name, "/dev/", 5) == 0)
+		name += 5;
+
+	if (strncmp(match, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0)
+		match += DEV_MD_DIR_LEN;
+	else if (strncmp(match, "/dev/", 5) == 0)
+		match += 5;
+
+	if (strncmp(name, "md", 2) == 0 && isdigit(name[2]))
+		name += 2;
+	if (strncmp(match, "md", 2) == 0 && isdigit(match[2]))
+		match += 2;
+
+	return (strcmp(name, match) == 0);
+}
+
+int conf_name_is_free(char *name)
+{
+	/* Check if this name is already taken by an ARRAY entry in
+	 * the config file.
+	 * It can be taken either by a match on devname, name, or
+	 * even super-minor.
+	 */
+	struct mddev_ident *dev;
+
+	load_conffile();
+	for (dev = mddevlist; dev; dev = dev->next) {
+		char nbuf[100];
+		if (dev->devname && devname_matches(name, dev->devname))
+			return 0;
+		if (dev->name[0] && devname_matches(name, dev->name))
+			return 0;
+		sprintf(nbuf, "%d", dev->super_minor);
+		if (dev->super_minor != UnSet && devname_matches(name, nbuf))
+			return 0;
+	}
+	return 1;
+}
+
+struct mddev_ident *conf_match(struct supertype *st,
+			       struct mdinfo *info,
+			       char *devname,
+			       int verbose, int *rvp)
+{
+	struct mddev_ident *array_list, *match;
+	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 && array_list->devname)
+				pr_err("UUID differs from %s.\n",
+				       array_list->devname);
+			continue;
+		}
+
+		if (array_list->devices && devname &&
+		    !match_oneof(array_list->devices, devname)) {
+			if (verbose >= 2 && array_list->devname)
+				pr_err("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 && array_list->devname)
+				pr_err("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 && array_list->devname)
+				pr_err("%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) {
+				if (match->devname && array_list->devname)
+					pr_err("we match both %s and %s - cannot decide which to use.\n",
+					       match->devname,
+					       array_list->devname);
+				else
+					pr_err("multiple lines in mdadm.conf match\n");
+			}
+			if (rvp)
+				*rvp = 2;
+			match = NULL;
+			break;
+		}
+		match = array_list;
+	}
+	return match;
+}
+
+int conf_verify_devnames(struct mddev_ident *array_list)
+{
+	struct mddev_ident *a1, *a2;
+
+	for (a1 = array_list; a1; a1 = a1->next) {
+		if (!a1->devname)
+			continue;
+		if (strcmp(a1->devname, "<ignore>") == 0)
+			continue;
+		for (a2 = a1->next; a2; a2 = a2->next) {
+			if (!a2->devname)
+				continue;
+			if (strcmp(a1->devname, a2->devname) != 0)
+				continue;
+
+			if (a1->uuid_set && a2->uuid_set) {
+				char nbuf[64];
+				__fname_from_uuid(a1->uuid, 0, nbuf, ':');
+				pr_err("Devices %s and ",
+				       nbuf);
+				__fname_from_uuid(a2->uuid, 0, nbuf, ':');
+				fprintf(stderr,
+					"%s have the same name: %s\n",
+					nbuf, a1->devname);
+			} else
+				pr_err("Device %s given twice in config file\n", a1->devname);
+			return 1;
+		}
+	}
+
+	return 0;
+}