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/*
* 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/signal.h>
static void alert(char *event, char *dev, char *disc, char *mailaddr, char *cmd);
int Monitor(mddev_dev_t devlist,
char *mailaddr, char *alert_cmd,
int period,
char *config)
{
/*
* 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.
*
* 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.
*
* if active_drives decreases, generate a "Fail" event
* if active_drives increases, generate a "SpareActive" event
*
* 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
*
*/
struct state {
char *devname;
long utime;
int err;
int active, working, failed, spare;
int devstate[MD_SB_DISKS];
struct state *next;
} *statelist = NULL;
int finished = 0;
while (! finished) {
mddev_ident_t mdlist = NULL;
mddev_dev_t dv;
int dnum=0;
if (devlist== NULL)
mdlist = conf_get_ident(config, NULL);
dv = devlist;
while (dv || mdlist) {
mddev_ident_t mdident;
struct state *st;
mdu_array_info_t array;
char *dev;
int fd;
char *event = NULL;
int i;
char *event_disc = NULL;
if (dv) {
dev = dv->devname;
mdident = conf_get_ident(config, dev);
dv = dv->next;
} else {
mdident = mdlist;
dev = mdident->devname;
mdlist = mdlist->next;
}
for (st=statelist; st ; st=st->next)
if (strcmp(st->devname, dev)==0)
break;
if (!st) {
st =malloc(sizeof *st);
if (st == NULL)
continue;
st->devname = strdup(dev);
st->utime = 0;
st->next = statelist;
st->err = 0;
statelist = st;
}
fd = open(dev, O_RDONLY);
if (fd < 0) {
if (!st->err)
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)
fprintf(stderr, Name ": cannot get array info for %s: %s\n",
dev, strerror(errno));
st->err=1;
close(fd);
continue;
}
st->err = 0;
if (st->utime == array.utime &&
st->failed == array.failed_disks) {
close(fd);
continue;
}
event = NULL;
if (st->utime) {
int i;
if (st->active > array.active_disks)
event = "Fail";
else if (st->working > array.working_disks)
event = "FailSpare";
else if (st->active < array.active_disks)
event = "ActiveSpare";
}
for (i=0; i<array.raid_disks+array.spare_disks; i++) {
mdu_disk_info_t disc;
disc.number = i;
if (ioctl(fd, GET_DISK_INFO, &disc)>= 0) {
if (event && event_disc == NULL &&
st->devstate[i] != disc.state) {
char * dv = map_dev(disc.major, disc.minor);
if (dv)
event_disc = strdup(dv);
}
st->devstate[i] = disc.state;
}
}
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;
if (event)
alert(event, dev, event_disc, mailaddr, alert_cmd);
}
sleep(period);
}
return 0;
}
static void alert(char *event, char *dev, char *disc, char *mailaddr, char *cmd)
{
if (!cmd && !mailaddr) {
time_t now = time(0);
printf("%0.15s: %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) {
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 sub-device %s.\n\n", disc);
fprintf(mp, "Faithfully yours, etc.\n");
fclose(mp);
}
}
/* FIXME log the event to syslog maybe */
}
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