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authorMichael Tokarev <mjt@tls.msk.ru>2014-12-20 08:48:44 +0000
committerMichael Tokarev <mjt@tls.msk.ru>2014-12-20 08:48:44 +0000
commit489bea7ee8e1dbecfa517b8415568044ab57c73a (patch)
tree44d4878d4c7da3f4908ea9a765ef9b8f9c141756 /Monitor.c
mdadm (3.3.2-5) unstable; urgency=medium
* use-tempnode-not-devnode.patch: change udev rules file to use $tempnode which works both on wheezy and jessie udev, instead of $devnode which only works in jessie. At this stage it is better to make rules file compatible with old version instead of adding versioned dependency. Should be removed for jessie+1. (Closes: #770883) * fix Closes: list in previous entry (Closes: #771852) # imported from the archive
Diffstat (limited to 'Monitor.c')
-rw-r--r--Monitor.c1109
1 files changed, 1109 insertions, 0 deletions
diff --git a/Monitor.c b/Monitor.c
new file mode 100644
index 0000000..5cb24fa
--- /dev/null
+++ b/Monitor.c
@@ -0,0 +1,1109 @@
+/*
+ * 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 "md_p.h"
+#include "md_u.h"
+#include <sys/wait.h>
+#include <signal.h>
+#include <limits.h>
+#include <syslog.h>
+
+struct state {
+ char *devname;
+ char devnm[32]; /* to sync with mdstat info */
+ long utime;
+ int err;
+ char *spare_group;
+ int active, working, failed, spare, raid;
+ int from_config;
+ int from_auto;
+ int expected_spares;
+ int devstate[MAX_DISKS];
+ dev_t devid[MAX_DISKS];
+ int percent;
+ char parent_devnm[32]; /* For subarray, devnm of parent.
+ * For others, ""
+ */
+ struct supertype *metadata;
+ struct state *subarray;/* for a container it is a link to first subarray
+ * for a subarray it is a link to next subarray
+ * in the same container */
+ struct state *parent; /* for a subarray it is a link to its container
+ */
+ struct state *next;
+};
+
+struct alert_info {
+ char *mailaddr;
+ char *mailfrom;
+ char *alert_cmd;
+ int dosyslog;
+};
+static int make_daemon(char *pidfile);
+static int check_one_sharer(int scan);
+static void alert(char *event, char *dev, char *disc, struct alert_info *info);
+static int check_array(struct state *st, struct mdstat_ent *mdstat,
+ int test, struct alert_info *info,
+ int increments, char *prefer);
+static int add_new_arrays(struct mdstat_ent *mdstat, struct state **statelist,
+ int test, struct alert_info *info);
+static void try_spare_migration(struct state *statelist, struct alert_info *info);
+static void link_containers_with_subarrays(struct state *list);
+
+int Monitor(struct mddev_dev *devlist,
+ char *mailaddr, char *alert_cmd,
+ struct context *c,
+ int daemonise, int oneshot,
+ int dosyslog, char *pidfile, int increments,
+ int share)
+{
+ /*
+ * 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
+ * RebuildNN
+ * percent went from below to not-below NN%
+ * 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 *statelist = NULL;
+ struct state *st2;
+ int finished = 0;
+ struct mdstat_ent *mdstat = NULL;
+ char *mailfrom = NULL;
+ struct alert_info info;
+
+ if (!mailaddr) {
+ mailaddr = conf_get_mailaddr();
+ if (mailaddr && ! c->scan)
+ pr_err("Monitor using email address \"%s\" from config file\n",
+ mailaddr);
+ }
+ mailfrom = conf_get_mailfrom();
+
+ if (!alert_cmd) {
+ alert_cmd = conf_get_program();
+ if (alert_cmd && ! c->scan)
+ pr_err("Monitor using program \"%s\" from config file\n",
+ alert_cmd);
+ }
+ if (c->scan && !mailaddr && !alert_cmd && !dosyslog) {
+ pr_err("No mail address or alert command - not monitoring.\n");
+ return 1;
+ }
+ info.alert_cmd = alert_cmd;
+ info.mailaddr = mailaddr;
+ info.mailfrom = mailfrom;
+ info.dosyslog = dosyslog;
+
+ if (daemonise) {
+ int rv = make_daemon(pidfile);
+ if (rv >= 0)
+ return rv;
+ }
+
+ if (share)
+ if (check_one_sharer(c->scan))
+ return 1;
+
+ if (devlist == NULL) {
+ struct mddev_ident *mdlist = conf_get_ident(NULL);
+ for (; mdlist; mdlist=mdlist->next) {
+ struct state *st;
+ if (mdlist->devname == NULL)
+ continue;
+ if (strcasecmp(mdlist->devname, "<ignore>") == 0)
+ continue;
+ st = xcalloc(1, sizeof *st);
+ if (mdlist->devname[0] == '/')
+ st->devname = xstrdup(mdlist->devname);
+ else {
+ st->devname = xmalloc(8+strlen(mdlist->devname)+1);
+ strcpy(strcpy(st->devname, "/dev/md/"),
+ mdlist->devname);
+ }
+ st->next = statelist;
+ st->devnm[0] = 0;
+ st->percent = RESYNC_UNKNOWN;
+ st->from_config = 1;
+ st->expected_spares = mdlist->spare_disks;
+ if (mdlist->spare_group)
+ st->spare_group = xstrdup(mdlist->spare_group);
+ statelist = st;
+ }
+ } else {
+ struct mddev_dev *dv;
+ for (dv=devlist ; dv; dv=dv->next) {
+ struct mddev_ident *mdlist = conf_get_ident(dv->devname);
+ struct state *st = xcalloc(1, sizeof *st);
+ st->devname = xstrdup(dv->devname);
+ st->next = statelist;
+ st->devnm[0] = 0;
+ st->percent = RESYNC_UNKNOWN;
+ st->expected_spares = -1;
+ if (mdlist) {
+ st->expected_spares = mdlist->spare_disks;
+ if (mdlist->spare_group)
+ st->spare_group = xstrdup(mdlist->spare_group);
+ }
+ statelist = st;
+ }
+ }
+
+ while (! finished) {
+ int new_found = 0;
+ struct state *st, **stp;
+ int anydegraded = 0;
+
+ if (mdstat)
+ free_mdstat(mdstat);
+ mdstat = mdstat_read(oneshot?0:1, 0);
+
+ for (st=statelist; st; st=st->next)
+ if (check_array(st, mdstat, c->test, &info,
+ increments, c->prefer))
+ anydegraded = 1;
+
+ /* now check if there are any new devices found in mdstat */
+ if (c->scan)
+ new_found = add_new_arrays(mdstat, &statelist, c->test,
+ &info);
+
+ /* 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
+ */
+ if (share && anydegraded)
+ try_spare_migration(statelist, &info);
+ if (!new_found) {
+ if (oneshot)
+ break;
+ else
+ mdstat_wait(c->delay);
+ }
+ c->test = 0;
+
+ for (stp = &statelist; (st = *stp) != NULL; ) {
+ if (st->from_auto && st->err > 5) {
+ *stp = st->next;
+ free(st->devname);
+ free(st->spare_group);
+ free(st);
+ } else
+ stp = &st->next;
+ }
+ }
+ for (st2 = statelist; st2; st2 = statelist) {
+ statelist = st2->next;
+ free(st2);
+ }
+
+ if (pidfile)
+ unlink(pidfile);
+ return 0;
+}
+
+static int make_daemon(char *pidfile)
+{
+ /* Return:
+ * -1 in the forked daemon
+ * 0 in the parent
+ * 1 on error
+ * so a none-negative becomes the exit code.
+ */
+ 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", O_RDWR);
+ dup2(0,1);
+ dup2(0,2);
+ setsid();
+ return -1;
+}
+
+static int check_one_sharer(int scan)
+{
+ int pid, rv;
+ FILE *fp;
+ char dir[20];
+ char path[100];
+ struct stat buf;
+ sprintf(path, "%s/autorebuild.pid", MDMON_DIR);
+ fp = fopen(path, "r");
+ if (fp) {
+ if (fscanf(fp, "%d", &pid) != 1)
+ pid = -1;
+ sprintf(dir, "/proc/%d", pid);
+ rv = stat(dir, &buf);
+ if (rv != -1) {
+ if (scan) {
+ pr_err("Only one "
+ "autorebuild process allowed"
+ " in scan mode, aborting\n");
+ fclose(fp);
+ return 1;
+ } else {
+ pr_err("Warning: One"
+ " autorebuild process already"
+ " running.\n");
+ }
+ }
+ fclose(fp);
+ }
+ if (scan) {
+ if (mkdir(MDMON_DIR, S_IRWXU) < 0 &&
+ errno != EEXIST) {
+ pr_err("Can't create "
+ "autorebuild.pid file\n");
+ } else {
+ fp = fopen(path, "w");
+ if (!fp)
+ pr_err("Cannot create"
+ " autorebuild.pid"
+ "file\n");
+ else {
+ pid = getpid();
+ fprintf(fp, "%d\n", pid);
+ fclose(fp);
+ }
+ }
+ }
+ return 0;
+}
+
+static void alert(char *event, char *dev, char *disc, struct alert_info *info)
+{
+ int priority;
+
+ if (!info->alert_cmd && !info->mailaddr && !info->dosyslog) {
+ time_t now = time(0);
+
+ printf("%1.15s: %s on %s %s\n", ctime(&now)+4, event, dev, disc?disc:"unknown device");
+ }
+ if (info->alert_cmd) {
+ int pid = fork();
+ switch(pid) {
+ default:
+ waitpid(pid, NULL, 0);
+ break;
+ case -1:
+ break;
+ case 0:
+ execl(info->alert_cmd, info->alert_cmd,
+ event, dev, disc, NULL);
+ exit(2);
+ }
+ }
+ if (info->mailaddr &&
+ (strncmp(event, "Fail", 4)==0 ||
+ strncmp(event, "Test", 4)==0 ||
+ strncmp(event, "Spares", 6)==0 ||
+ strncmp(event, "Degrade", 7)==0)) {
+ FILE *mp = popen(Sendmail, "w");
+ if (mp) {
+ FILE *mdstat;
+ char hname[256];
+ gethostname(hname, sizeof(hname));
+ signal(SIGPIPE, SIG_IGN);
+ if (info->mailfrom)
+ fprintf(mp, "From: %s\n", info->mailfrom);
+ else
+ fprintf(mp, "From: " Name " monitoring <root>\n");
+ fprintf(mp, "To: %s\n", info->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 && disc[0] != ' ')
+ fprintf(mp,
+ "It could be related to"
+ " component device %s.\n\n", disc);
+ if (disc && disc[0] == ' ')
+ fprintf(mp, "Extra information:%s.\n\n", disc);
+
+ fprintf(mp, "Faithfully yours, etc.\n");
+
+ mdstat = fopen("/proc/mdstat", "r");
+ if (mdstat) {
+ char buf[8192];
+ int n;
+ fprintf(mp,
+ "\nP.S. The /proc/mdstat file"
+ " currently contains the following:\n\n");
+ while ( (n=fread(buf, 1, sizeof(buf), mdstat)) > 0)
+ n=fwrite(buf, 1, n, mp);
+ fclose(mdstat);
+ }
+ pclose(mp);
+ }
+ }
+
+ /* log the event to syslog maybe */
+ if (info->dosyslog) {
+ /* Log at a different severity depending on the event.
+ *
+ * These are the critical events: */
+ if (strncmp(event, "Fail", 4)==0 ||
+ strncmp(event, "Degrade", 7)==0 ||
+ strncmp(event, "DeviceDisappeared", 17)==0)
+ priority = LOG_CRIT;
+ /* Good to know about, but are not failures: */
+ else if (strncmp(event, "Rebuild", 7)==0 ||
+ strncmp(event, "MoveSpare", 9)==0 ||
+ strncmp(event, "Spares", 6) != 0)
+ priority = LOG_WARNING;
+ /* Everything else: */
+ else
+ priority = LOG_INFO;
+
+ if (disc)
+ syslog(priority,
+ "%s event detected on md device %s,"
+ " component device %s", event, dev, disc);
+ else
+ syslog(priority,
+ "%s event detected on md device %s",
+ event, dev);
+ }
+}
+
+static int check_array(struct state *st, struct mdstat_ent *mdstat,
+ int test, struct alert_info *ainfo,
+ int increments, char *prefer)
+{
+ /* Update the state 'st' to reflect any changes shown in mdstat,
+ * or found by directly examining the array, and return
+ * '1' if the array is degraded, or '0' if it is optimal (or dead).
+ */
+ struct { int state, major, minor; } info[MAX_DISKS];
+ mdu_array_info_t array;
+ struct mdstat_ent *mse = NULL, *mse2;
+ char *dev = st->devname;
+ int fd;
+ int i;
+ int remaining_disks;
+ int last_disk;
+ int new_array = 0;
+
+ if (test)
+ alert("TestMessage", dev, NULL, ainfo);
+ fd = open(dev, O_RDONLY);
+ if (fd < 0) {
+ if (!st->err)
+ alert("DeviceDisappeared", dev, NULL, ainfo);
+ st->err++;
+ return 0;
+ }
+ fcntl(fd, F_SETFD, FD_CLOEXEC);
+ if (ioctl(fd, GET_ARRAY_INFO, &array)<0) {
+ if (!st->err)
+ alert("DeviceDisappeared", dev, NULL, ainfo);
+ st->err++;
+ close(fd);
+ return 0;
+ }
+ /* It's much easier to list what array levels can't
+ * have a device disappear than all of them that can
+ */
+ if (array.level == 0 || array.level == -1) {
+ if (!st->err && !st->from_config)
+ alert("DeviceDisappeared", dev, "Wrong-Level", ainfo);
+ st->err++;
+ close(fd);
+ return 0;
+ }
+ if (st->devnm[0] == 0)
+ strcpy(st->devnm, fd2devnm(fd));
+
+ for (mse2 = mdstat ; mse2 ; mse2=mse2->next)
+ if (strcmp(mse2->devnm, st->devnm) == 0) {
+ mse2->devnm[0] = 0; /* flag it as "used" */
+ mse = mse2;
+ }
+
+ if (!mse) {
+ /* duplicated array in statelist
+ * or re-created after reading mdstat*/
+ st->err++;
+ close(fd);
+ return 0;
+ }
+ /* this array is in /proc/mdstat */
+ if (array.utime == 0)
+ /* external arrays don't update utime, so
+ * just make sure it is always different. */
+ array.utime = st->utime + 1;;
+
+ if (st->err) {
+ /* New array appeared where previously had an error */
+ st->err = 0;
+ st->percent = RESYNC_NONE;
+ new_array = 1;
+ alert("NewArray", st->devname, NULL, ainfo);
+ }
+
+ 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);
+ if ((st->active < st->raid) && st->spare == 0)
+ return 1;
+ else
+ return 0;
+ }
+ if (st->utime == 0 && /* new array */
+ mse->pattern && strchr(mse->pattern, '_') /* degraded */
+ )
+ alert("DegradedArray", dev, NULL, ainfo);
+
+ if (st->utime == 0 && /* new array */
+ st->expected_spares > 0 &&
+ array.spare_disks < st->expected_spares)
+ alert("SparesMissing", dev, NULL, ainfo);
+ if (st->percent < 0 && st->percent != RESYNC_UNKNOWN &&
+ mse->percent >= 0)
+ alert("RebuildStarted", dev, NULL, ainfo);
+ if (st->percent >= 0 &&
+ mse->percent >= 0 &&
+ (mse->percent / increments) > (st->percent / increments)) {
+ char percentalert[15]; // "RebuildNN" (10 chars) or "RebuildStarted" (15 chars)
+
+ if((mse->percent / increments) == 0)
+ snprintf(percentalert, sizeof(percentalert), "RebuildStarted");
+ else
+ snprintf(percentalert, sizeof(percentalert), "Rebuild%02d", mse->percent);
+
+ alert(percentalert, dev, NULL, ainfo);
+ }
+
+ if (mse->percent == RESYNC_NONE &&
+ st->percent >= 0) {
+ /* Rebuild/sync/whatever just finished.
+ * If there is a number in /mismatch_cnt,
+ * we should report that.
+ */
+ struct mdinfo *sra =
+ sysfs_read(-1, st->devnm, GET_MISMATCH);
+ if (sra && sra->mismatch_cnt > 0) {
+ char cnt[80];
+ snprintf(cnt, sizeof(cnt),
+ " mismatches found: %d (on raid level %d)",
+ sra->mismatch_cnt, array.level);
+ alert("RebuildFinished", dev, cnt, ainfo);
+ } else
+ alert("RebuildFinished", dev, NULL, ainfo);
+ if (sra)
+ free(sra);
+ }
+ st->percent = mse->percent;
+
+ remaining_disks = array.nr_disks;
+ for (i=0; i<MAX_DISKS && remaining_disks > 0;
+ i++) {
+ mdu_disk_info_t disc;
+ disc.number = i;
+ if (ioctl(fd, GET_DISK_INFO, &disc) >= 0) {
+ info[i].state = disc.state;
+ info[i].major = disc.major;
+ info[i].minor = disc.minor;
+ if (disc.major || disc.minor)
+ remaining_disks --;
+ } else
+ info[i].major = info[i].minor = 0;
+ }
+ last_disk = i;
+
+ if (mse->metadata_version &&
+ strncmp(mse->metadata_version, "external:", 9) == 0 &&
+ is_subarray(mse->metadata_version+9)) {
+ char *sl;
+ strcpy(st->parent_devnm,
+ mse->metadata_version+10);
+ sl = strchr(st->parent_devnm, '/');
+ if (sl)
+ *sl = 0;
+ } else
+ st->parent_devnm[0] = 0;
+ if (st->metadata == NULL &&
+ st->parent_devnm[0] == 0)
+ st->metadata = super_by_fd(fd, NULL);
+
+ close(fd);
+
+ for (i=0; i<MAX_DISKS; i++) {
+ mdu_disk_info_t disc = {0,0,0,0,0};
+ int newstate=0;
+ int change;
+ char *dv = NULL;
+ disc.number = i;
+ if (i < last_disk &&
+ (info[i].major || info[i].minor)) {
+ newstate = info[i].state;
+ dv = map_dev_preferred(
+ info[i].major, info[i].minor, 1,
+ prefer);
+ disc.state = newstate;
+ disc.major = info[i].major;
+ disc.minor = info[i].minor;
+ } else
+ newstate = (1 << MD_DISK_REMOVED);
+
+ if (dv == NULL && st->devid[i])
+ dv = map_dev_preferred(
+ major(st->devid[i]),
+ minor(st->devid[i]), 1, prefer);
+ change = newstate ^ st->devstate[i];
+ if (st->utime && change && !st->err && !new_array) {
+ if ((st->devstate[i]&change)&(1<<MD_DISK_SYNC))
+ alert("Fail", dev, dv, ainfo);
+ else if ((newstate & (1<<MD_DISK_FAULTY)) &&
+ (disc.major || disc.minor) &&
+ st->devid[i] == makedev(disc.major, disc.minor))
+ alert("FailSpare", dev, dv, ainfo);
+ else if ((newstate&change)&(1<<MD_DISK_SYNC))
+ alert("SpareActive", dev, dv, ainfo);
+ }
+ st->devstate[i] = newstate;
+ st->devid[i] = makedev(disc.major, disc.minor);
+ }
+ 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;
+ if ((st->active < st->raid) && st->spare == 0)
+ return 1;
+ return 0;
+}
+
+static int add_new_arrays(struct mdstat_ent *mdstat, struct state **statelist,
+ int test, struct alert_info *info)
+{
+ struct mdstat_ent *mse;
+ int new_found = 0;
+
+ for (mse=mdstat; mse; mse=mse->next)
+ if (mse->devnm[0] &&
+ (!mse->level || /* retrieve containers */
+ (strcmp(mse->level, "raid0") != 0 &&
+ strcmp(mse->level, "linear") != 0))
+ ) {
+ struct state *st = xcalloc(1, sizeof *st);
+ mdu_array_info_t array;
+ int fd;
+ st->devname = xstrdup(get_md_name(mse->devnm));
+ if ((fd = open(st->devname, O_RDONLY)) < 0 ||
+ ioctl(fd, GET_ARRAY_INFO, &array)< 0) {
+ /* no such array */
+ if (fd >=0) close(fd);
+ put_md_name(st->devname);
+ free(st->devname);
+ if (st->metadata) {
+ st->metadata->ss->free_super(st->metadata);
+ free(st->metadata);
+ }
+ free(st);
+ continue;
+ }
+ close(fd);
+ st->next = *statelist;
+ st->err = 1;
+ st->from_auto = 1;
+ strcpy(st->devnm, mse->devnm);
+ st->percent = RESYNC_UNKNOWN;
+ st->expected_spares = -1;
+ if (mse->metadata_version &&
+ strncmp(mse->metadata_version, "external:", 9) == 0 &&
+ is_subarray(mse->metadata_version+9)) {
+ char *sl;
+ strcpy(st->parent_devnm,
+ mse->metadata_version+10);
+ sl = strchr(st->parent_devnm, '/');
+ *sl = 0;
+ } else
+ st->parent_devnm[0] = 0;
+ *statelist = st;
+ if (test)
+ alert("TestMessage", st->devname, NULL, info);
+ new_found = 1;
+ }
+ return new_found;
+}
+
+static int get_min_spare_size_required(struct state *st, unsigned long long *sizep)
+{
+ int fd;
+
+ if (!st->metadata ||
+ !st->metadata->ss->min_acceptable_spare_size) {
+ *sizep = 0;
+ return 0;
+ }
+
+ fd = open(st->devname, O_RDONLY);
+ if (fd < 0)
+ return 1;
+ if (st->metadata->ss->external)
+ st->metadata->ss->load_container(st->metadata, fd, st->devname);
+ else
+ st->metadata->ss->load_super(st->metadata, fd, st->devname);
+ close(fd);
+ if (!st->metadata->sb)
+ return 1;
+ *sizep = st->metadata->ss->min_acceptable_spare_size(st->metadata);
+ st->metadata->ss->free_super(st->metadata);
+
+ return 0;
+}
+
+static int check_donor(struct state *from, struct state *to)
+{
+ struct state *sub;
+
+ if (from == to)
+ return 0;
+ if (from->parent)
+ /* Cannot move from a member */
+ return 0;
+ if (from->err)
+ return 0;
+ for (sub = from->subarray; sub; sub = sub->subarray)
+ /* If source array has degraded subarrays, don't
+ * remove anything
+ */
+ if (sub->active < sub->raid)
+ return 0;
+ if (from->metadata->ss->external == 0)
+ if (from->active < from->raid)
+ return 0;
+ if (from->spare <= 0)
+ return 0;
+ return 1;
+}
+
+static dev_t choose_spare(struct state *from, struct state *to,
+ struct domainlist *domlist, unsigned long long min_size)
+{
+ int d;
+ dev_t dev = 0;
+
+ for (d = from->raid; !dev && d < MAX_DISKS; d++) {
+ if (from->devid[d] > 0 &&
+ from->devstate[d] == 0) {
+ struct dev_policy *pol;
+ unsigned long long dev_size;
+
+ if (to->metadata->ss->external &&
+ test_partition_from_id(from->devid[d]))
+ continue;
+
+ if (min_size &&
+ dev_size_from_id(from->devid[d], &dev_size) &&
+ dev_size < min_size)
+ continue;
+
+ pol = devid_policy(from->devid[d]);
+ if (from->spare_group)
+ pol_add(&pol, pol_domain,
+ from->spare_group, NULL);
+ if (domain_test(domlist, pol, to->metadata->ss->name) == 1)
+ dev = from->devid[d];
+ dev_policy_free(pol);
+ }
+ }
+ return dev;
+}
+
+static dev_t container_choose_spare(struct state *from, struct state *to,
+ struct domainlist *domlist,
+ unsigned long long min_size, int active)
+{
+ /* This is similar to choose_spare, but we cannot trust devstate,
+ * so we need to read the metadata instead
+ */
+ struct mdinfo *list;
+ struct supertype *st = from->metadata;
+ int fd = open(from->devname, O_RDONLY);
+ int err;
+ dev_t dev = 0;
+
+ if (fd < 0)
+ return 0;
+ if (!st->ss->getinfo_super_disks) {
+ close(fd);
+ return 0;
+ }
+
+ err = st->ss->load_container(st, fd, NULL);
+ close(fd);
+ if (err)
+ return 0;
+
+ if (from == to) {
+ /* We must check if number of active disks has not increased
+ * since ioctl in main loop. mdmon may have added spare
+ * to subarray. If so we do not need to look for more spares
+ * so return non zero value */
+ int active_cnt = 0;
+ struct mdinfo *dp;
+ list = st->ss->getinfo_super_disks(st);
+ if (!list) {
+ st->ss->free_super(st);
+ return 1;
+ }
+ dp = list->devs;
+ while (dp) {
+ if (dp->disk.state & (1<<MD_DISK_SYNC) &&
+ !(dp->disk.state & (1<<MD_DISK_FAULTY)))
+ active_cnt++;
+ dp = dp->next;
+ }
+ sysfs_free(list);
+ if (active < active_cnt) {
+ /* Spare just activated.*/
+ st->ss->free_super(st);
+ return 1;
+ }
+ }
+
+ /* We only need one spare so full list not needed */
+ list = container_choose_spares(st, min_size, domlist, from->spare_group,
+ to->metadata->ss->name, 1);
+ if (list) {
+ struct mdinfo *disks = list->devs;
+ if (disks)
+ dev = makedev(disks->disk.major, disks->disk.minor);
+ sysfs_free(list);
+ }
+ st->ss->free_super(st);
+ return dev;
+}
+
+static void try_spare_migration(struct state *statelist, struct alert_info *info)
+{
+ struct state *from;
+ struct state *st;
+
+ link_containers_with_subarrays(statelist);
+ for (st = statelist; st; st = st->next)
+ if (st->active < st->raid &&
+ st->spare == 0 && !st->err) {
+ struct domainlist *domlist = NULL;
+ int d;
+ struct state *to = st;
+ unsigned long long min_size;
+
+ if (to->parent_devnm[0] && !to->parent)
+ /* subarray monitored without parent container
+ * we can't move spares here */
+ continue;
+
+ if (to->parent)
+ /* member of a container */
+ to = to->parent;
+
+ if (get_min_spare_size_required(to, &min_size))
+ continue;
+ if (to->metadata->ss->external) {
+ /* We must make sure there is
+ * no suitable spare in container already.
+ * If there is we don't add more */
+ dev_t devid = container_choose_spare(
+ to, to, NULL, min_size, st->active);
+ if (devid > 0)
+ continue;
+ }
+ for (d = 0; d < MAX_DISKS; d++)
+ if (to->devid[d])
+ domainlist_add_dev(&domlist,
+ to->devid[d],
+ to->metadata->ss->name);
+ if (to->spare_group)
+ domain_add(&domlist, to->spare_group);
+ /*
+ * No spare migration if the destination
+ * has no domain. Skip this array.
+ */
+ if (!domlist)
+ continue;
+ for (from=statelist ; from ; from=from->next) {
+ dev_t devid;
+ if (!check_donor(from, to))
+ continue;
+ if (from->metadata->ss->external)
+ devid = container_choose_spare(
+ from, to, domlist, min_size, 0);
+ else
+ devid = choose_spare(from, to, domlist,
+ min_size);
+ if (devid > 0
+ && move_spare(from->devname, to->devname, devid)) {
+ alert("MoveSpare", to->devname, from->devname, info);
+ break;
+ }
+ }
+ domain_free(domlist);
+ }
+}
+
+/* search the statelist to connect external
+ * metadata subarrays with their containers
+ * We always completely rebuild the tree from scratch as
+ * that is safest considering the possibility of entries
+ * disappearing or changing.
+ */
+static void link_containers_with_subarrays(struct state *list)
+{
+ struct state *st;
+ struct state *cont;
+ for (st = list; st; st = st->next) {
+ st->parent = NULL;
+ st->subarray = NULL;
+ }
+ for (st = list; st; st = st->next)
+ if (st->parent_devnm[0])
+ for (cont = list; cont; cont = cont->next)
+ if (!cont->err &&
+ cont->parent_devnm[0] == 0 &&
+ strcmp(cont->devnm, st->parent_devnm) == 0) {
+ st->parent = cont;
+ st->subarray = cont->subarray;
+ cont->subarray = st;
+ break;
+ }
+}
+
+/* Not really Monitor but ... */
+int Wait(char *dev)
+{
+ struct stat stb;
+ char devnm[32];
+ int rv = 1;
+
+ if (stat(dev, &stb) != 0) {
+ pr_err("Cannot find %s: %s\n", dev,
+ strerror(errno));
+ return 2;
+ }
+ strcpy(devnm, stat2devnm(&stb));
+
+ while(1) {
+ struct mdstat_ent *ms = mdstat_read(1, 0);
+ struct mdstat_ent *e;
+
+ for (e=ms ; e; e=e->next)
+ if (strcmp(e->devnm, devnm) == 0)
+ break;
+
+ if (e->percent == RESYNC_NONE) {
+ /* We could be in the brief pause before something
+ * starts. /proc/mdstat doesn't show that, but
+ * sync_action does.
+ */
+ struct mdinfo mdi;
+ char buf[21];
+ sysfs_init(&mdi, -1, devnm);
+ if (sysfs_get_str(&mdi, NULL, "sync_action",
+ buf, 20) > 0 &&
+ strcmp(buf,"idle\n") != 0)
+ e->percent = RESYNC_UNKNOWN;
+ }
+ if (!e || e->percent == RESYNC_NONE) {
+ if (e && e->metadata_version &&
+ strncmp(e->metadata_version, "external:", 9) == 0) {
+ if (is_subarray(&e->metadata_version[9]))
+ ping_monitor(&e->metadata_version[9]);
+ else
+ ping_monitor(devnm);
+ }
+ free_mdstat(ms);
+ return rv;
+ }
+ free_mdstat(ms);
+ rv = 0;
+ mdstat_wait(5);
+ }
+}
+
+#ifndef MDASSEMBLE
+
+static char *clean_states[] = {
+ "clear", "inactive", "readonly", "read-auto", "clean", NULL };
+
+int WaitClean(char *dev, int sock, int verbose)
+{
+ int fd;
+ struct mdinfo *mdi;
+ int rv = 1;
+ char devnm[32];
+
+ fd = open(dev, O_RDONLY);
+ if (fd < 0) {
+ if (verbose)
+ pr_err("Couldn't open %s: %s\n", dev, strerror(errno));
+ return 1;
+ }
+
+ strcpy(devnm, fd2devnm(fd));
+ mdi = sysfs_read(fd, devnm, GET_VERSION|GET_LEVEL|GET_SAFEMODE);
+ if (!mdi) {
+ if (verbose)
+ pr_err("Failed to read sysfs attributes for "
+ "%s\n", dev);
+ close(fd);
+ return 0;
+ }
+
+ switch(mdi->array.level) {
+ case LEVEL_LINEAR:
+ case LEVEL_MULTIPATH:
+ case 0:
+ /* safemode delay is irrelevant for these levels */
+ rv = 0;
+ }
+
+ /* for internal metadata the kernel handles the final clean
+ * transition, containers can never be dirty
+ */
+ if (!is_subarray(mdi->text_version))
+ rv = 0;
+
+ /* safemode disabled ? */
+ if (mdi->safe_mode_delay == 0)
+ rv = 0;
+
+ if (rv) {
+ int state_fd = sysfs_open(fd2devnm(fd), NULL, "array_state");
+ char buf[20];
+ int delay = 5000;
+
+ /* minimize the safe_mode_delay and prepare to wait up to 5s
+ * for writes to quiesce
+ */
+ sysfs_set_safemode(mdi, 1);
+
+ /* wait for array_state to be clean */
+ while (1) {
+ rv = read(state_fd, buf, sizeof(buf));
+ if (rv < 0)
+ break;
+ if (sysfs_match_word(buf, clean_states) <= 4)
+ break;
+ rv = sysfs_wait(state_fd, &delay);
+ if (rv < 0 && errno != EINTR)
+ break;
+ lseek(state_fd, 0, SEEK_SET);
+ }
+ if (rv < 0)
+ rv = 1;
+ else if (fping_monitor(sock) == 0 ||
+ ping_monitor(mdi->text_version) == 0) {
+ /* we need to ping to close the window between array
+ * state transitioning to clean and the metadata being
+ * marked clean
+ */
+ rv = 0;
+ } else
+ rv = 1;
+ if (rv && verbose)
+ pr_err("Error waiting for %s to be clean\n",
+ dev);
+
+ /* restore the original safe_mode_delay */
+ sysfs_set_safemode(mdi, mdi->safe_mode_delay);
+ close(state_fd);
+ }
+
+ sysfs_free(mdi);
+ close(fd);
+
+ return rv;
+}
+#endif /* MDASSEMBLE */