220 lines
5.8 KiB
C
220 lines
5.8 KiB
C
/*
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* mdadm - manage Linux "md" devices aka RAID arrays.
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*
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* Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Neil Brown
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* Email: <neilb@cse.unsw.edu.au>
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* Paper: Neil Brown
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* School of Computer Science and Engineering
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* The University of New South Wales
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* Sydney, 2052
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* Australia
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*/
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#include "mdadm.h"
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#include "md_p.h"
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#include "md_u.h"
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#include <sys/signal.h>
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static void alert(char *event, char *dev, char *disc, char *mailaddr, char *cmd);
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int Monitor(mddev_dev_t devlist,
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char *mailaddr, char *alert_cmd,
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int period,
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char *config)
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{
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/*
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* Every few seconds, scan every md device looking for changes
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* When a change is found, log it, possibly run the alert command,
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* and possibly send Email
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*
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* For each array, we record:
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* Update time
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* active/working/failed/spare drives
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* State of each device.
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*
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* If the update time changes, check out all the data again
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* It is possible that we cannot get the state of each device
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* due to bugs in the md kernel module.
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*
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* if active_drives decreases, generate a "Fail" event
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* if active_drives increases, generate a "SpareActive" event
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*
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* if we detect an array with active<raid and spare==0
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* we look at other arrays that have same spare-group
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* If we find one with active==raid and spare>0,
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* and if we can get_disk_info and find a name
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* Then we hot-remove and hot-add to the other array
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*
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*/
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struct state {
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char *devname;
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long utime;
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int err;
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int active, working, failed, spare;
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int devstate[MD_SB_DISKS];
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struct state *next;
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} *statelist = NULL;
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int finished = 0;
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while (! finished) {
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mddev_ident_t mdlist = NULL;
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mddev_dev_t dv;
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int dnum=0;
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if (devlist== NULL)
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mdlist = conf_get_ident(config, NULL);
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dv = devlist;
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while (dv || mdlist) {
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mddev_ident_t mdident;
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struct state *st;
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mdu_array_info_t array;
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char *dev;
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int fd;
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char *event = NULL;
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int i;
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char *event_disc = NULL;
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if (dv) {
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dev = dv->devname;
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mdident = conf_get_ident(config, dev);
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dv = dv->next;
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} else {
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mdident = mdlist;
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dev = mdident->devname;
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mdlist = mdlist->next;
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}
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for (st=statelist; st ; st=st->next)
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if (strcmp(st->devname, dev)==0)
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break;
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if (!st) {
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st =malloc(sizeof *st);
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if (st == NULL)
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continue;
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st->devname = strdup(dev);
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st->utime = 0;
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st->next = statelist;
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st->err = 0;
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statelist = st;
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}
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fd = open(dev, O_RDONLY);
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if (fd < 0) {
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if (!st->err)
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fprintf(stderr, Name ": cannot open %s: %s\n",
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dev, strerror(errno));
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st->err=1;
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continue;
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}
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if (ioctl(fd, GET_ARRAY_INFO, &array)<0) {
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if (!st->err)
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fprintf(stderr, Name ": cannot get array info for %s: %s\n",
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dev, strerror(errno));
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st->err=1;
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close(fd);
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continue;
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}
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st->err = 0;
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if (st->utime == array.utime &&
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st->failed == array.failed_disks) {
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close(fd);
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continue;
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}
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event = NULL;
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if (st->utime) {
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int i;
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if (st->active > array.active_disks)
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event = "Fail";
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else if (st->working > array.working_disks)
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event = "FailSpare";
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else if (st->active < array.active_disks)
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event = "ActiveSpare";
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}
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for (i=0; i<array.raid_disks+array.spare_disks; i++) {
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mdu_disk_info_t disc;
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disc.number = i;
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if (ioctl(fd, GET_DISK_INFO, &disc)>= 0) {
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if (event && event_disc == NULL &&
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st->devstate[i] != disc.state) {
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char * dv = map_dev(disc.major, disc.minor);
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if (dv)
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event_disc = strdup(dv);
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}
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st->devstate[i] = disc.state;
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}
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}
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close(fd);
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st->active = array.active_disks;
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st->working = array.working_disks;
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st->spare = array.spare_disks;
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st->failed = array.failed_disks;
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st->utime = array.utime;
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if (event)
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alert(event, dev, event_disc, mailaddr, alert_cmd);
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}
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sleep(period);
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}
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return 0;
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}
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static void alert(char *event, char *dev, char *disc, char *mailaddr, char *cmd)
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{
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if (!cmd && !mailaddr) {
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time_t now = time(0);
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printf("%0.15s: %s on %s %s\n", ctime(&now)+4, event, dev, disc?disc:"unknown device");
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}
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if (cmd) {
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int pid = fork();
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switch(pid) {
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default:
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waitpid(pid, NULL, 0);
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break;
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case -1:
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break;
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case 0:
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execl(cmd, cmd, event, dev, disc, NULL);
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exit(2);
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}
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}
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if (mailaddr && strncmp(event, "Fail", 4)==0) {
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FILE *mp = popen(Sendmail, "w");
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if (mp) {
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char hname[256];
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gethostname(hname, sizeof(hname));
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signal(SIGPIPE, SIG_IGN);
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fprintf(mp, "From: " Name " monitoring <root>\n");
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fprintf(mp, "To: %s\n", mailaddr);
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fprintf(mp, "Subject: %s event on %s:%s\n\n", event, dev, hname);
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fprintf(mp, "This is an automatically generated mail message from " Name "\n");
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fprintf(mp, "running on %s\n\n", hname);
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fprintf(mp, "A %s event had been detected on md device %s.\n\n", event, dev);
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if (disc)
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fprintf(mp, "It could be related to sub-device %s.\n\n", disc);
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fprintf(mp, "Faithfully yours, etc.\n");
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fclose(mp);
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}
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}
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/* FIXME log the event to syslog maybe */
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}
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