[thirdparty/mdadm.git] / Monitor.c

/*
 * mdadm - manage Linux "md" devices aka RAID arrays.
 *
 * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
 *
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *    Author: Neil Brown
 *    Email: <neilb@cse.unsw.edu.au>
 *    Paper: Neil Brown
 *           School of Computer Science and Engineering
 *           The University of New South Wales
 *           Sydney, 2052
 *           Australia
 */

#include	"mdadm.h"
#include	"md_p.h"
#include	"md_u.h"
#include	<sys/wait.h>
#include	<sys/signal.h>
#include	<values.h>

static void alert(char *event, char *dev, char *disc, char *mailaddr, char *cmd);

static char *percentalerts[] = { 
	"RebuildStarted",
	"Rebuild20",
	"Rebuild40",
	"Rebuild60",
	"Rebuild80",
};

int Monitor(mddev_dev_t devlist,
	    char *mailaddr, char *alert_cmd,
	    int period, int daemonise, int scan, int oneshot,
	    char *config, int test, char* pidfile)
{
	/*
	 * Every few seconds, scan every md device looking for changes
	 * When a change is found, log it, possibly run the alert command,
	 * and possibly send Email
	 *
	 * For each array, we record:
	 *   Update time
	 *   active/working/failed/spare drives
	 *   State of each device.
	 *   %rebuilt if rebuilding
	 *
	 * If the update time changes, check out all the data again
	 * It is possible that we cannot get the state of each device
	 * due to bugs in the md kernel module.
	 * We also read /proc/mdstat to get rebuild percent,
	 * and to get state on all active devices incase of kernel bug.
	 *
	 * Events are:
	 *    Fail
	 *	An active device had Faulty set or Active/Sync removed
	 *    FailSpare
	 *      A spare device had Faulty set
	 *    SpareActive
	 *      An active device had a reverse transition
	 *    RebuildStarted
	 *      percent went from -1 to +ve
	 *    Rebuild20 Rebuild40 Rebuild60 Rebuild80
	 *      percent went from below to not-below that number
	 *    DeviceDisappeared
	 *      Couldn't access a device which was previously visible
	 *
	 * if we detect an array with active<raid and spare==0
	 * we look at other arrays that have same spare-group
	 * If we find one with active==raid and spare>0,
	 *  and if we can get_disk_info and find a name
	 *  Then we hot-remove and hot-add to the other array
	 *
	 * If devlist is NULL, then we can monitor everything because --scan
	 * was given.  We get an initial list from config file and add anything
	 * that appears in /proc/mdstat
	 */

	struct state {
		char *devname;
		int devnum;	/* to sync with mdstat info */
		long utime;
		int err;
		char *spare_group;
		int active, working, failed, spare, raid;
		int expected_spares;
		int devstate[MD_SB_DISKS];
		int devid[MD_SB_DISKS];
		int percent;
		struct state *next;
	} *statelist = NULL;
	int finished = 0;
	struct mdstat_ent *mdstat = NULL;

	if (!mailaddr) {
		mailaddr = conf_get_mailaddr(config);
		if (mailaddr && ! scan)
			fprintf(stderr, Name ": Monitor using email address \"%s\" from config file\n",
			       mailaddr);
	}
	if (!alert_cmd) {
		alert_cmd = conf_get_program(config);
		if (alert_cmd && ! scan)
			fprintf(stderr, Name ": Monitor using program \"%s\" from config file\n",
			       alert_cmd);
	}
	if (scan && !mailaddr && !alert_cmd) {
		fprintf(stderr, Name ": No mail address or alert command - not monitoring.\n");
		return 1;
	}

	if (daemonise) {
		int pid = fork();
		if (pid > 0) {
			if (!pidfile)
				printf("%d\n", pid);
			else {
				FILE *pid_file;
				pid_file=fopen(pidfile, "w");
				if (!pid_file)
					perror("cannot create pid file");
				else {
					fprintf(pid_file,"%d\n", pid);
					fclose(pid_file);
				}
			}
			return 0;
		}
		if (pid < 0) {
			perror("daemonise");
			return 1;
		}
		close(0);
		open("/dev/null", 3);
		dup2(0,1);
		dup2(0,2);
		setsid();
	}

	if (devlist == NULL) {
		mddev_ident_t mdlist = conf_get_ident(config, NULL);
		for (; mdlist; mdlist=mdlist->next) {
			struct state *st = malloc(sizeof *st);
			if (st == NULL)
				continue;
			st->devname = strdup(mdlist->devname);
			st->utime = 0;
			st->next = statelist;
			st->err = 0;
			st->devnum = MAXINT;
			st->percent = -2;
			st->expected_spares = mdlist->spare_disks;
			if (mdlist->spare_group)
				st->spare_group = strdup(mdlist->spare_group);
			else
				st->spare_group = NULL;
			statelist = st;
		}
	} else {
		mddev_dev_t dv;
		for (dv=devlist ; dv; dv=dv->next) {
			mddev_ident_t mdlist = conf_get_ident(config, dv->devname);
			struct state *st = malloc(sizeof *st);
			if (st == NULL)
				continue;
			st->devname = strdup(dv->devname);
			st->utime = 0;
			st->next = statelist;
			st->err = 0;
			st->devnum = MAXINT;
			st->percent = -2;
			st->expected_spares = -1;
			st->spare_group = NULL;
			if (mdlist) {
				st->expected_spares = mdlist->spare_disks;
				if (mdlist->spare_group)
					st->spare_group = strdup(mdlist->spare_group);
			}
			statelist = st;
		}
	}


	while (! finished) {
		int new_found = 0;
		struct state *st;

		if (mdstat)
			free_mdstat(mdstat);
		mdstat = mdstat_read(oneshot?0:1);

		for (st=statelist; st; st=st->next) {
			mdu_array_info_t array;
			struct mdstat_ent *mse = NULL, *mse2;
			char *dev = st->devname;
			int fd;
			unsigned int i;

			if (test)
				alert("TestMessage", dev, NULL, mailaddr, alert_cmd);
			fd = open(dev, O_RDONLY);
			if (fd < 0) {
				if (!st->err)
					alert("DeviceDisappeared", dev, NULL,
					      mailaddr, alert_cmd);
/*					fprintf(stderr, Name ": cannot open %s: %s\n",
						dev, strerror(errno));
*/				st->err=1;
				continue;
			}
			if (ioctl(fd, GET_ARRAY_INFO, &array)<0) {
				if (!st->err)
					alert("DeviceDisappeared", dev, NULL,
					      mailaddr, alert_cmd);
/*					fprintf(stderr, Name ": cannot get array info for %s: %s\n",
						dev, strerror(errno));
*/				st->err=1;
				close(fd);
				continue;
			}
			if (array.level != 1 && array.level != 5 && array.level != -4 &&
				array.level != 6 && array.level != 10) {
				if (!st->err)
					alert("DeviceDisappeared", dev, "Wrong-Level",
					      mailaddr, alert_cmd);
				st->err = 1;
				close(fd);
				continue;
			}
			if (st->devnum == MAXINT) {
				struct stat stb;
				if (fstat(fd, &stb) == 0 &&
				    (S_IFMT&stb.st_mode)==S_IFBLK) {
					if (major(stb.st_rdev) == MD_MAJOR)
						st->devnum = minor(stb.st_rdev);
					else
						st->devnum = -1- (minor(stb.st_rdev)>>6);
				}
			}

			for (mse2 = mdstat ; mse2 ; mse2=mse2->next)
				if (mse2->devnum == st->devnum) {
					mse2->devnum = MAXINT; /* flag it as "used" */
					mse = mse2;
				}

			if (st->utime == array.utime &&
			    st->failed == array.failed_disks &&
			    st->working == array.working_disks &&
			    st->spare == array.spare_disks &&
			    (mse == NULL  || (
				    mse->percent == st->percent
				    ))) {
				close(fd);
				st->err = 0;
				continue;
			}
			if (st->utime == 0 && /* new array */
			    mse &&	/* is in /proc/mdstat */
			    mse->pattern && strchr(mse->pattern, '_') /* degraded */
				)
				alert("DegradedArray", dev, NULL, mailaddr, alert_cmd);

			if (st->utime == 0 && /* new array */
			    st->expected_spares > 0 && 
			    array.spare_disks < st->expected_spares) 
				alert("SparesMissing", dev, NULL, mailaddr, alert_cmd);
			if (mse &&
			    st->percent == -1 && 
			    mse->percent >= 0)
				alert("RebuildStarted", dev, NULL, mailaddr, alert_cmd);
			if (mse &&
			    st->percent >= 0 &&
			    mse->percent >= 0 &&
			    (mse->percent / 20) > (st->percent / 20))
				alert(percentalerts[mse->percent/20],
				      dev, NULL, mailaddr, alert_cmd);

			if (mse &&
			    mse->percent == -1 &&
			    st->percent >= 0)
				alert("RebuildFinished", dev, NULL, mailaddr, alert_cmd);

			if (mse)
				st->percent = mse->percent;
					
			for (i=0; i<MD_SB_DISKS; i++) {
				mdu_disk_info_t disc;
				int newstate=0;
				int change;
				char *dv = NULL;
				disc.number = i;
				if (ioctl(fd, GET_DISK_INFO, &disc)>= 0) {
					newstate = disc.state;
					dv = map_dev(disc.major, disc.minor);
				} else if (mse &&  mse->pattern && i < strlen(mse->pattern))
					switch(mse->pattern[i]) {
					case 'U': newstate = 6 /* ACTIVE/SYNC */; break;
					case '_': newstate = 0; break;
					}
				change = newstate ^ st->devstate[i];
				if (st->utime && change && !st->err) {
					if (i < (unsigned)array.raid_disks &&
					    (((newstate&change)&(1<<MD_DISK_FAULTY)) ||
					     ((st->devstate[i]&change)&(1<<MD_DISK_ACTIVE)) ||
					     ((st->devstate[i]&change)&(1<<MD_DISK_SYNC)))
						)
						alert("Fail", dev, dv, mailaddr, alert_cmd);
					else if (i >= (unsigned)array.raid_disks &&
						 (disc.major || disc.minor) &&
						 st->devid[i] == makedev(disc.major, disc.minor) &&
						 ((newstate&change)&(1<<MD_DISK_FAULTY))
						)
						alert("FailSpare", dev, dv, mailaddr, alert_cmd);
					else if (i < (unsigned)array.raid_disks &&
						 (((st->devstate[i]&change)&(1<<MD_DISK_FAULTY)) ||
						  ((newstate&change)&(1<<MD_DISK_ACTIVE)) ||
						  ((newstate&change)&(1<<MD_DISK_SYNC)))
						)
						alert("SpareActive", dev, dv, mailaddr, alert_cmd);
				}
				st->devstate[i] = disc.state;
				st->devid[i] = makedev(disc.major, disc.minor);
			}
			close(fd);
			st->active = array.active_disks;
			st->working = array.working_disks;
			st->spare = array.spare_disks;
			st->failed = array.failed_disks;
			st->utime = array.utime;
			st->raid = array.raid_disks;
			st->err = 0;
		}
		/* now check if there are any new devices found in mdstat */
		if (scan) {
			struct mdstat_ent *mse;
			for (mse=mdstat; mse; mse=mse->next) 
				if (mse->devnum != MAXINT &&
				    (strcmp(mse->level, "raid1")==0 ||
				     strcmp(mse->level, "raid5")==0 ||
				     strcmp(mse->level, "multipath")==0)
					) {
					struct state *st = malloc(sizeof *st);
					mdu_array_info_t array;
					int fd;
					if (st == NULL)
						continue;
					st->devname = strdup(get_md_name(mse->devnum));
					if ((fd = open(st->devname, O_RDONLY)) < 0 ||
					    ioctl(fd, GET_ARRAY_INFO, &array)< 0) {
						/* no such array */
						if (fd >=0) close(fd);
						free(st->devname);
						free(st);
						continue;
					}
					close(fd);
					st->utime = 0;
					st->next = statelist;
					st->err = 1;
					st->devnum = mse->devnum;
					st->percent = -2;
					st->spare_group = NULL;
					st->expected_spares = -1;
					statelist = st;
					alert("NewArray", st->devname, NULL, mailaddr, alert_cmd);
					new_found = 1;
				}
		}
		/* If an array has active < raid && spare == 0 && spare_group != NULL
		 * Look for another array with spare > 0 and active == raid and same spare_group
		 *  if found, choose a device and hotremove/hotadd
		 */
		for (st = statelist; st; st=st->next)
			if (st->active < st->raid &&
			    st->spare == 0 &&
			    st->spare_group != NULL) {
				struct state *st2;
				for (st2=statelist ; st2 ; st2=st2->next)
					if (st2 != st &&
					    st2->spare > 0 &&
					    st2->active == st2->raid &&
					    st2->spare_group != NULL &&
					    strcmp(st->spare_group, st2->spare_group) == 0) {
						/* try to remove and add */
						int fd1 = open(st->devname, O_RDONLY);
						int fd2 = open(st2->devname, O_RDONLY);
						int dev = -1;
						int d;
						if (fd1 < 0 || fd2 < 0) {
							if (fd1>=0) close(fd1);
							if (fd2>=0) close(fd2);
							continue;
						}
						for (d=st2->raid; d<MD_SB_DISKS; d++) {
							if (st2->devid[d] > 0 &&
							    st2->devstate[d] == 0) {
								dev = st2->devid[d];
								break;
							}
						}
						if (dev > 0) {
							if (ioctl(fd2, HOT_REMOVE_DISK, 
								  (unsigned long)dev) == 0) {
								if (ioctl(fd1, HOT_ADD_DISK,
									  (unsigned long)dev) == 0) {
									alert("MoveSpare", st->devname, st2->devname, mailaddr, alert_cmd);
									close(fd1);
									close(fd2);
									break;
								}
								else ioctl(fd2, HOT_ADD_DISK, (unsigned long) dev);
							}
						}
						close(fd1);
						close(fd2);
					}
			}
		if (!new_found) {
			if (oneshot)
				break;
			else
				mdstat_wait(period);
		}
		test = 0;
	}
	if (pidfile)
		unlink(pidfile);
	return 0;
}


static void alert(char *event, char *dev, char *disc, char *mailaddr, char *cmd)
{
	if (!cmd && !mailaddr) {
		time_t now = time(0);
	       
		printf("%1.15s: %s on %s %s\n", ctime(&now)+4, event, dev, disc?disc:"unknown device");
	}
	if (cmd) {
		int pid = fork();
		switch(pid) {
		default:
			waitpid(pid, NULL, 0);
			break;
		case -1:
			break;
		case 0:
			execl(cmd, cmd, event, dev, disc, NULL);
			exit(2);
		}
	}
	if (mailaddr && 
	    (strncmp(event, "Fail", 4)==0 || 
	     strncmp(event, "Test", 4)==0 ||
	     strncmp(event, "Degrade", 7)==0)) {
		FILE *mp = popen(Sendmail, "w");
		if (mp) {
			char hname[256];
			gethostname(hname, sizeof(hname));
			signal(SIGPIPE, SIG_IGN);
			fprintf(mp, "From: " Name " monitoring <root>\n");
			fprintf(mp, "To: %s\n", mailaddr);
			fprintf(mp, "Subject: %s event on %s:%s\n\n", event, dev, hname);

			fprintf(mp, "This is an automatically generated mail message from " Name "\n");
			fprintf(mp, "running on %s\n\n", hname);

			fprintf(mp, "A %s event had been detected on md device %s.\n\n", event, dev);

			if (disc)
				fprintf(mp, "It could be related to component device %s.\n\n", disc);

			fprintf(mp, "Faithfully yours, etc.\n");
			fclose(mp);
		}

	}
	/* FIXME log the event to syslog maybe */
}
Commit	Line	Data
52826846	1	/*
9a9dab36	2	* mdadm - manage Linux "md" devices aka RAID arrays.
52826846	3	*
cd29a5c8	4	* Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
52826846 NB	5	*
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*
	21	* Author: Neil Brown
	22	* Email: <neilb@cse.unsw.edu.au>
	23	* Paper: Neil Brown
	24	* School of Computer Science and Engineering
	25	* The University of New South Wales
	26	* Sydney, 2052
	27	* Australia
	28	*/
	29
9a9dab36	30	#include "mdadm.h"
52826846 NB	31	#include "md_p.h"
52826846 NB	32	#include "md_u.h"
e0d19036	33	#include <sys/wait.h>
52826846	34	#include <sys/signal.h>
98c6faba	35	#include <values.h>
52826846 NB	36
	37	static void alert(char event, char dev, char disc, char mailaddr, char *cmd);
	38
e0d19036 NB	39	static char *percentalerts[] = {
	40	"RebuildStarted",
	41	"Rebuild20",
	42	"Rebuild40",
	43	"Rebuild60",
	44	"Rebuild80",
	45	};
	46
cd29a5c8	47	int Monitor(mddev_dev_t devlist,
52826846	48	char mailaddr, char alert_cmd,
aa88f531	49	int period, int daemonise, int scan, int oneshot,
b5e64645	50	char config, int test, char pidfile)
52826846 NB	51	{
	52	/*
	53	* Every few seconds, scan every md device looking for changes
	54	* When a change is found, log it, possibly run the alert command,
	55	* and possibly send Email
	56	*
	57	* For each array, we record:
	58	* Update time
	59	* active/working/failed/spare drives
	60	* State of each device.
e0d19036	61	* %rebuilt if rebuilding
52826846 NB	62	*
	63	* If the update time changes, check out all the data again
	64	* It is possible that we cannot get the state of each device
	65	* due to bugs in the md kernel module.
e0d19036 NB	66	* We also read /proc/mdstat to get rebuild percent,
e0d19036 NB	67	* and to get state on all active devices incase of kernel bug.
52826846	68	*
e0d19036 NB	69	* Events are:
	70	* Fail
	71	* An active device had Faulty set or Active/Sync removed
	72	* FailSpare
	73	* A spare device had Faulty set
	74	* SpareActive
	75	* An active device had a reverse transition
	76	* RebuildStarted
	77	* percent went from -1 to +ve
	78	* Rebuild20 Rebuild40 Rebuild60 Rebuild80
	79	* percent went from below to not-below that number
	80	* DeviceDisappeared
	81	* Couldn't access a device which was previously visible
52826846 NB	82	*
	83	* if we detect an array with active<raid and spare==0
	84	* we look at other arrays that have same spare-group
	85	* If we find one with active==raid and spare>0,
	86	* and if we can get_disk_info and find a name
	87	* Then we hot-remove and hot-add to the other array
	88	*
e0d19036 NB	89	* If devlist is NULL, then we can monitor everything because --scan
	90	* was given. We get an initial list from config file and add anything
	91	* that appears in /proc/mdstat
52826846 NB	92	*/
	93
	94	struct state {
	95	char *devname;
e0d19036	96	int devnum; /* to sync with mdstat info */
52826846 NB	97	long utime;
52826846 NB	98	int err;
e0d19036 NB	99	char *spare_group;
e0d19036 NB	100	int active, working, failed, spare, raid;
feb716e9	101	int expected_spares;
52826846	102	int devstate[MD_SB_DISKS];
e0d19036 NB	103	int devid[MD_SB_DISKS];
e0d19036 NB	104	int percent;
52826846 NB	105	struct state *next;
	106	} *statelist = NULL;
	107	int finished = 0;
e0d19036 NB	108	struct mdstat_ent *mdstat = NULL;
e0d19036 NB	109
d013a55e	110	if (!mailaddr) {
e0d19036	111	mailaddr = conf_get_mailaddr(config);
d013a55e	112	if (mailaddr && ! scan)
56eedc1a	113	fprintf(stderr, Name ": Monitor using email address \"%s\" from config file\n",
d013a55e NB	114	mailaddr);
	115	}
	116	if (!alert_cmd) {
e0d19036	117	alert_cmd = conf_get_program(config);
d013a55e	118	if (alert_cmd && ! scan)
56eedc1a	119	fprintf(stderr, Name ": Monitor using program \"%s\" from config file\n",
d013a55e NB	120	alert_cmd);
d013a55e NB	121	}
56eedc1a NB	122	if (scan && !mailaddr && !alert_cmd) {
56eedc1a NB	123	fprintf(stderr, Name ": No mail address or alert command - not monitoring.\n");
d013a55e	124	return 1;
56eedc1a	125	}
d013a55e NB	126
	127	if (daemonise) {
	128	int pid = fork();
	129	if (pid > 0) {
b5e64645 NB	130	if (!pidfile)
	131	printf("%d\n", pid);
	132	else {
	133	FILE *pid_file;
	134	pid_file=fopen(pidfile, "w");
	135	if (!pid_file)
	136	perror("cannot create pid file");
	137	else {
	138	fprintf(pid_file,"%d\n", pid);
	139	fclose(pid_file);
	140	}
	141	}
d013a55e NB	142	return 0;
	143	}
	144	if (pid < 0) {
	145	perror("daemonise");
	146	return 1;
	147	}
	148	close(0);
	149	open("/dev/null", 3);
	150	dup2(0,1);
	151	dup2(0,2);
	152	setsid();
	153	}
e0d19036 NB	154
	155	if (devlist == NULL) {
	156	mddev_ident_t mdlist = conf_get_ident(config, NULL);
	157	for (; mdlist; mdlist=mdlist->next) {
	158	struct state st = malloc(sizeof st);
	159	if (st == NULL)
	160	continue;
	161	st->devname = strdup(mdlist->devname);
	162	st->utime = 0;
	163	st->next = statelist;
d013a55e	164	st->err = 0;
98c6faba	165	st->devnum = MAXINT;
e0d19036	166	st->percent = -2;
feb716e9	167	st->expected_spares = mdlist->spare_disks;
e0d19036 NB	168	if (mdlist->spare_group)
	169	st->spare_group = strdup(mdlist->spare_group);
	170	else
	171	st->spare_group = NULL;
	172	statelist = st;
	173	}
	174	} else {
cd29a5c8	175	mddev_dev_t dv;
e0d19036	176	for (dv=devlist ; dv; dv=dv->next) {
e5329c37	177	mddev_ident_t mdlist = conf_get_ident(config, dv->devname);
e0d19036 NB	178	struct state st = malloc(sizeof st);
	179	if (st == NULL)
	180	continue;
	181	st->devname = strdup(dv->devname);
	182	st->utime = 0;
	183	st->next = statelist;
d013a55e	184	st->err = 0;
98c6faba	185	st->devnum = MAXINT;
e0d19036	186	st->percent = -2;
feb716e9	187	st->expected_spares = -1;
e0d19036	188	st->spare_group = NULL;
e5329c37 NB	189	if (mdlist) {
	190	st->expected_spares = mdlist->spare_disks;
	191	if (mdlist->spare_group)
	192	st->spare_group = strdup(mdlist->spare_group);
	193	}
e0d19036 NB	194	statelist = st;
	195	}
	196	}
	197
	198
	199	while (! finished) {
aa88f531	200	int new_found = 0;
e0d19036 NB	201	struct state *st;
	202
	203	if (mdstat)
	204	free_mdstat(mdstat);
dd0781e5	205	mdstat = mdstat_read(oneshot?0:1);
e0d19036 NB	206
e0d19036 NB	207	for (st=statelist; st; st=st->next) {
52826846	208	mdu_array_info_t array;
dd0781e5	209	struct mdstat_ent mse = NULL, mse2;
e0d19036	210	char *dev = st->devname;
52826846	211	int fd;
98c6faba	212	unsigned int i;
e0d19036	213
98c6faba NB	214	if (test)
98c6faba NB	215	alert("TestMessage", dev, NULL, mailaddr, alert_cmd);
52826846 NB	216	fd = open(dev, O_RDONLY);
	217	if (fd < 0) {
	218	if (!st->err)
e0d19036 NB	219	alert("DeviceDisappeared", dev, NULL,
	220	mailaddr, alert_cmd);
	221	/* fprintf(stderr, Name ": cannot open %s: %s\n",
52826846	222	dev, strerror(errno));
e0d19036	223	*/ st->err=1;
52826846 NB	224	continue;
	225	}
	226	if (ioctl(fd, GET_ARRAY_INFO, &array)<0) {
	227	if (!st->err)
e0d19036 NB	228	alert("DeviceDisappeared", dev, NULL,
	229	mailaddr, alert_cmd);
	230	/* fprintf(stderr, Name ": cannot get array info for %s: %s\n",
52826846	231	dev, strerror(errno));
e0d19036	232	*/ st->err=1;
52826846 NB	233	close(fd);
	234	continue;
	235	}
e5329c37 NB	236	if (array.level != 1 && array.level != 5 && array.level != -4 &&
e5329c37 NB	237	array.level != 6 && array.level != 10) {
5787fa49 NB	238	if (!st->err)
	239	alert("DeviceDisappeared", dev, "Wrong-Level",
	240	mailaddr, alert_cmd);
	241	st->err = 1;
	242	close(fd);
	243	continue;
	244	}
98c6faba	245	if (st->devnum == MAXINT) {
e0d19036 NB	246	struct stat stb;
e0d19036 NB	247	if (fstat(fd, &stb) == 0 &&
98c6faba	248	(S_IFMT&stb.st_mode)==S_IFBLK) {
0df46c2a NB	249	if (major(stb.st_rdev) == MD_MAJOR)
0df46c2a NB	250	st->devnum = minor(stb.st_rdev);
98c6faba	251	else
0df46c2a	252	st->devnum = -1- (minor(stb.st_rdev)>>6);
98c6faba	253	}
e0d19036 NB	254	}
e0d19036 NB	255
dd0781e5 NB	256	for (mse2 = mdstat ; mse2 ; mse2=mse2->next)
	257	if (mse2->devnum == st->devnum) {
	258	mse2->devnum = MAXINT; /* flag it as "used" */
	259	mse = mse2;
	260	}
e0d19036	261
52826846	262	if (st->utime == array.utime &&
e0d19036 NB	263	st->failed == array.failed_disks &&
	264	st->working == array.working_disks &&
	265	st->spare == array.spare_disks &&
	266	(mse == NULL \|\| (
	267	mse->percent == st->percent
	268	))) {
52826846	269	close(fd);
e0d19036	270	st->err = 0;
52826846 NB	271	continue;
52826846 NB	272	}
aa88f531 NB	273	if (st->utime == 0 && /* new array */
	274	mse && /* is in /proc/mdstat */
	275	mse->pattern && strchr(mse->pattern, '_') /* degraded */
	276	)
	277	alert("DegradedArray", dev, NULL, mailaddr, alert_cmd);
	278
feb716e9 NB	279	if (st->utime == 0 && /* new array */
	280	st->expected_spares > 0 &&
	281	array.spare_disks < st->expected_spares)
	282	alert("SparesMissing", dev, NULL, mailaddr, alert_cmd);
e0d19036 NB	283	if (mse &&
	284	st->percent == -1 &&
	285	mse->percent >= 0)
	286	alert("RebuildStarted", dev, NULL, mailaddr, alert_cmd);
	287	if (mse &&
	288	st->percent >= 0 &&
	289	mse->percent >= 0 &&
	290	(mse->percent / 20) > (st->percent / 20))
	291	alert(percentalerts[mse->percent/20],
	292	dev, NULL, mailaddr, alert_cmd);
	293
98c6faba NB	294	if (mse &&
	295	mse->percent == -1 &&
	296	st->percent >= 0)
	297	alert("RebuildFinished", dev, NULL, mailaddr, alert_cmd);
	298
e0d19036 NB	299	if (mse)
	300	st->percent = mse->percent;
	301
	302	for (i=0; i<MD_SB_DISKS; i++) {
52826846	303	mdu_disk_info_t disc;
e0d19036 NB	304	int newstate=0;
	305	int change;
	306	char *dv = NULL;
52826846 NB	307	disc.number = i;
52826846 NB	308	if (ioctl(fd, GET_DISK_INFO, &disc)>= 0) {
e0d19036 NB	309	newstate = disc.state;
e0d19036 NB	310	dv = map_dev(disc.major, disc.minor);
5787fa49	311	} else if (mse && mse->pattern && i < strlen(mse->pattern))
e0d19036 NB	312	switch(mse->pattern[i]) {
	313	case 'U': newstate = 6 /* ACTIVE/SYNC */; break;
	314	case '_': newstate = 0; break;
52826846	315	}
e0d19036 NB	316	change = newstate ^ st->devstate[i];
e0d19036 NB	317	if (st->utime && change && !st->err) {
98c6faba	318	if (i < (unsigned)array.raid_disks &&
e0d19036 NB	319	(((newstate&change)&(1<<MD_DISK_FAULTY)) \|\|
	320	((st->devstate[i]&change)&(1<<MD_DISK_ACTIVE)) \|\|
	321	((st->devstate[i]&change)&(1<<MD_DISK_SYNC)))
	322	)
	323	alert("Fail", dev, dv, mailaddr, alert_cmd);
98c6faba	324	else if (i >= (unsigned)array.raid_disks &&
e0d19036	325	(disc.major \|\| disc.minor) &&
0df46c2a	326	st->devid[i] == makedev(disc.major, disc.minor) &&
e0d19036 NB	327	((newstate&change)&(1<<MD_DISK_FAULTY))
	328	)
	329	alert("FailSpare", dev, dv, mailaddr, alert_cmd);
98c6faba	330	else if (i < (unsigned)array.raid_disks &&
e0d19036 NB	331	(((st->devstate[i]&change)&(1<<MD_DISK_FAULTY)) \|\|
	332	((newstate&change)&(1<<MD_DISK_ACTIVE)) \|\|
	333	((newstate&change)&(1<<MD_DISK_SYNC)))
	334	)
	335	alert("SpareActive", dev, dv, mailaddr, alert_cmd);
52826846	336	}
e0d19036	337	st->devstate[i] = disc.state;
0df46c2a	338	st->devid[i] = makedev(disc.major, disc.minor);
52826846 NB	339	}
	340	close(fd);
	341	st->active = array.active_disks;
	342	st->working = array.working_disks;
	343	st->spare = array.spare_disks;
	344	st->failed = array.failed_disks;
	345	st->utime = array.utime;
e0d19036 NB	346	st->raid = array.raid_disks;
e0d19036 NB	347	st->err = 0;
52826846	348	}
e0d19036 NB	349	/* now check if there are any new devices found in mdstat */
	350	if (scan) {
	351	struct mdstat_ent *mse;
	352	for (mse=mdstat; mse; mse=mse->next)
98c6faba	353	if (mse->devnum != MAXINT &&
5787fa49 NB	354	(strcmp(mse->level, "raid1")==0 \|\|
	355	strcmp(mse->level, "raid5")==0 \|\|
	356	strcmp(mse->level, "multipath")==0)
	357	) {
e0d19036	358	struct state st = malloc(sizeof st);
98c6faba NB	359	mdu_array_info_t array;
98c6faba NB	360	int fd;
e0d19036 NB	361	if (st == NULL)
	362	continue;
	363	st->devname = strdup(get_md_name(mse->devnum));
98c6faba NB	364	if ((fd = open(st->devname, O_RDONLY)) < 0 \|\|
	365	ioctl(fd, GET_ARRAY_INFO, &array)< 0) {
	366	/* no such array */
	367	if (fd >=0) close(fd);
	368	free(st->devname);
	369	free(st);
	370	continue;
	371	}
dd0781e5	372	close(fd);
e0d19036 NB	373	st->utime = 0;
	374	st->next = statelist;
	375	st->err = 1;
	376	st->devnum = mse->devnum;
	377	st->percent = -2;
	378	st->spare_group = NULL;
98c6faba	379	st->expected_spares = -1;
e0d19036 NB	380	statelist = st;
e0d19036 NB	381	alert("NewArray", st->devname, NULL, mailaddr, alert_cmd);
aa88f531	382	new_found = 1;
e0d19036 NB	383	}
	384	}
	385	/* If an array has active < raid && spare == 0 && spare_group != NULL
	386	* Look for another array with spare > 0 and active == raid and same spare_group
	387	* if found, choose a device and hotremove/hotadd
	388	*/
	389	for (st = statelist; st; st=st->next)
	390	if (st->active < st->raid &&
	391	st->spare == 0 &&
	392	st->spare_group != NULL) {
	393	struct state *st2;
	394	for (st2=statelist ; st2 ; st2=st2->next)
	395	if (st2 != st &&
	396	st2->spare > 0 &&
	397	st2->active == st2->raid &&
	398	st2->spare_group != NULL &&
	399	strcmp(st->spare_group, st2->spare_group) == 0) {
	400	/* try to remove and add */
	401	int fd1 = open(st->devname, O_RDONLY);
	402	int fd2 = open(st2->devname, O_RDONLY);
	403	int dev = -1;
	404	int d;
	405	if (fd1 < 0 \|\| fd2 < 0) {
	406	if (fd1>=0) close(fd1);
	407	if (fd2>=0) close(fd2);
	408	continue;
	409	}
	410	for (d=st2->raid; d<MD_SB_DISKS; d++) {
	411	if (st2->devid[d] > 0 &&
	412	st2->devstate[d] == 0) {
	413	dev = st2->devid[d];
	414	break;
	415	}
	416	}
	417	if (dev > 0) {
	418	if (ioctl(fd2, HOT_REMOVE_DISK,
	419	(unsigned long)dev) == 0) {
	420	if (ioctl(fd1, HOT_ADD_DISK,
	421	(unsigned long)dev) == 0) {
	422	alert("MoveSpare", st->devname, st2->devname, mailaddr, alert_cmd);
	423	close(fd1);
	424	close(fd2);
	425	break;
	426	}
	427	else ioctl(fd2, HOT_ADD_DISK, (unsigned long) dev);
	428	}
	429	}
	430	close(fd1);
	431	close(fd2);
	432	}
	433	}
aa88f531 NB	434	if (!new_found) {
	435	if (oneshot)
	436	break;
	437	else
dd0781e5	438	mdstat_wait(period);
aa88f531	439	}
98c6faba	440	test = 0;
52826846	441	}
b5e64645 NB	442	if (pidfile)
b5e64645 NB	443	unlink(pidfile);
52826846 NB	444	return 0;
	445	}
	446
	447
	448	static void alert(char event, char dev, char disc, char mailaddr, char *cmd)
	449	{
cd29a5c8 NB	450	if (!cmd && !mailaddr) {
	451	time_t now = time(0);
	452
e0d19036	453	printf("%1.15s: %s on %s %s\n", ctime(&now)+4, event, dev, disc?disc:"unknown device");
cd29a5c8	454	}
52826846 NB	455	if (cmd) {
	456	int pid = fork();
	457	switch(pid) {
	458	default:
	459	waitpid(pid, NULL, 0);
	460	break;
	461	case -1:
	462	break;
	463	case 0:
	464	execl(cmd, cmd, event, dev, disc, NULL);
	465	exit(2);
	466	}
	467	}
aa88f531 NB	468	if (mailaddr &&
aa88f531 NB	469	(strncmp(event, "Fail", 4)==0 \|\|
98c6faba	470	strncmp(event, "Test", 4)==0 \|\|
aa88f531	471	strncmp(event, "Degrade", 7)==0)) {
52826846 NB	472	FILE *mp = popen(Sendmail, "w");
	473	if (mp) {
	474	char hname[256];
	475	gethostname(hname, sizeof(hname));
	476	signal(SIGPIPE, SIG_IGN);
	477	fprintf(mp, "From: " Name " monitoring <root>\n");
	478	fprintf(mp, "To: %s\n", mailaddr);
	479	fprintf(mp, "Subject: %s event on %s:%s\n\n", event, dev, hname);
	480
	481	fprintf(mp, "This is an automatically generated mail message from " Name "\n");
	482	fprintf(mp, "running on %s\n\n", hname);
	483
	484	fprintf(mp, "A %s event had been detected on md device %s.\n\n", event, dev);
	485
	486	if (disc)
56eedc1a	487	fprintf(mp, "It could be related to component device %s.\n\n", disc);
52826846 NB	488
	489	fprintf(mp, "Faithfully yours, etc.\n");
	490	fclose(mp);
	491	}
	492
	493	}
	494	/* FIXME log the event to syslog maybe */
	495	}