OBJS = mdadm.o config.o policy.o mdstat.o ReadMe.o uuid.o util.o maps.o lib.o udev.o \
Manage.o Assemble.o Build.o \
- Create.o Detail.o Examine.o Grow.o Monitor.o dlink.o Kill.o Query.o \
+ Create.o Detail.o Examine.o Grow.o mdmonitor.o dlink.o Kill.o Query.o \
Incremental.o Dump.o \
mdopen.o super0.o super1.o super-ddf.o super-intel.o bitmap.o \
super-mbr.o super-gpt.o \
+++ /dev/null
-/*
- * 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 "udev.h"
-#include "xmalloc.h"
-
-#include <sys/wait.h>
-#include <limits.h>
-#include <syslog.h>
-
-#define TASK_COMM_LEN 16
-#define EVENT_NAME_MAX 32
-#define AUTOREBUILD_PID_PATH MDMON_DIR "/autorebuild.pid"
-#define FALLBACK_DELAY 5
-
-/**
- * struct state - external array or container properties.
- * @devname: has length of %DEV_MD_DIR + device name + terminating byte
- * @devnm: to sync with mdstat info
- * @parent_devnm: or subarray, devnm of parent, for others, ""
- * @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
- * @parent: for a subarray it is a link to its container
- */
-struct state {
- char devname[MD_NAME_MAX + sizeof(DEV_MD_DIR)];
- char devnm[MD_NAME_MAX];
- unsigned int 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[MD_NAME_MAX];
- struct supertype *metadata;
- struct state *subarray;
- struct state *parent;
- struct state *next;
-};
-
-struct alert_info {
- char hostname[HOST_NAME_MAX];
- char *mailaddr;
- char *mailfrom;
- char *alert_cmd;
- int dosyslog;
- int test;
-} info;
-
-enum event {
- EVENT_SPARE_ACTIVE = 0,
- EVENT_NEW_ARRAY,
- EVENT_MOVE_SPARE,
- EVENT_TEST_MESSAGE,
- __SYSLOG_PRIORITY_WARNING,
- EVENT_REBUILD_STARTED,
- EVENT_REBUILD,
- EVENT_REBUILD_FINISHED,
- EVENT_SPARES_MISSING,
- __SYSLOG_PRIORITY_CRITICAL,
- EVENT_DEVICE_DISAPPEARED,
- EVENT_FAIL,
- EVENT_FAIL_SPARE,
- EVENT_DEGRADED_ARRAY,
- EVENT_UNKNOWN
-};
-
-mapping_t events_map[] = {
- {"SpareActive", EVENT_SPARE_ACTIVE},
- {"NewArray", EVENT_NEW_ARRAY},
- {"MoveSpare", EVENT_MOVE_SPARE},
- {"TestMessage", EVENT_TEST_MESSAGE},
- {"RebuildStarted", EVENT_REBUILD_STARTED},
- {"Rebuild", EVENT_REBUILD},
- {"RebuildFinished", EVENT_REBUILD_FINISHED},
- {"SparesMissing", EVENT_SPARES_MISSING},
- {"DeviceDisappeared", EVENT_DEVICE_DISAPPEARED},
- {"Fail", EVENT_FAIL},
- {"FailSpare", EVENT_FAIL_SPARE},
- {"DegradedArray", EVENT_DEGRADED_ARRAY},
- {NULL, EVENT_UNKNOWN}
-};
-
-struct event_data {
- enum event event_enum;
- /*
- * @event_name: Rebuild event name must be in form "RebuildXX", where XX is rebuild progress.
- */
- char event_name[EVENT_NAME_MAX];
- char message[BUFSIZ];
- const char *description;
- const char *dev;
- const char *disc;
-};
-
-static int add_new_arrays(struct mdstat_ent *mdstat, struct state **statelist);
-static void try_spare_migration(struct state *statelist);
-static void link_containers_with_subarrays(struct state *list);
-static void free_statelist(struct state *statelist);
-static int check_array(struct state *st, struct mdstat_ent *mdstat, int increments, char *prefer);
-static int check_one_sharer(int scan);
-static void link_containers_with_subarrays(struct state *list);
-static int make_daemon(char *pidfile);
-static void try_spare_migration(struct state *statelist);
-static void wait_for_events(int *delay_for_event, int c_delay);
-static void wait_for_events_mdstat(int *delay_for_event, int c_delay);
-static int write_autorebuild_pid(void);
-
-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 if --scan
- * was given. We get an initial list from config file and add anything
- * that appears in /proc/mdstat
- */
-
- struct state *statelist = NULL;
- int finished = 0;
- struct mdstat_ent *mdstat = NULL;
- char *mailfrom;
- struct mddev_ident *mdlist;
- int delay_for_event = c->delay;
-
- if (devlist && c->scan) {
- pr_err("Devices list and --scan option cannot be combined - not monitoring.\n");
- return 1;
- }
-
- if (!mailaddr)
- mailaddr = conf_get_mailaddr();
-
- if (!alert_cmd)
- alert_cmd = conf_get_program();
-
- mailfrom = conf_get_mailfrom();
-
- if (c->scan && !mailaddr && !alert_cmd && !dosyslog) {
- pr_err("No mail address or alert command - not monitoring.\n");
- return 1;
- }
-
- if (c->verbose) {
- pr_err("Monitor is started with delay %ds\n", c->delay);
- if (mailaddr)
- pr_err("Monitor using email address %s\n", mailaddr);
- if (alert_cmd)
- pr_err("Monitor using program %s\n", alert_cmd);
- }
-
- info.alert_cmd = alert_cmd;
- info.mailaddr = mailaddr;
- info.mailfrom = mailfrom;
- info.dosyslog = dosyslog;
- info.test = c->test;
-
- if (s_gethostname(info.hostname, sizeof(info.hostname)) != 0) {
- pr_err("Cannot get hostname.\n");
- return 1;
- }
-
- if (mkdir(MDMON_DIR, 0700) < 0 && errno != EEXIST) {
- pr_err("Failed to create directory " MDMON_DIR ": %s\n", strerror(errno));
- return 1;
- }
-
- if (share){
- if (check_one_sharer(c->scan) == 2)
- return 1;
- }
-
- if (daemonise) {
- int rv = make_daemon(pidfile);
- if (rv >= 0)
- return rv;
- }
-
- if (share)
- if (write_autorebuild_pid() != 0)
- return 1;
-
- if (devlist == NULL) {
- mdlist = conf_get_ident(NULL);
- for (; mdlist; mdlist = mdlist->next) {
- struct state *st;
-
- if (mdlist->devname == NULL)
- continue;
- if (is_devname_ignore(mdlist->devname) == true)
- continue;
- if (!is_mddev(mdlist->devname))
- continue;
-
- st = xcalloc(1, sizeof *st);
- snprintf(st->devname, MD_NAME_MAX + sizeof(DEV_MD_DIR), DEV_MD_DIR "%s",
- basename(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 state *st;
-
- if (!is_mddev(dv->devname))
- continue;
-
- st = xcalloc(1, sizeof *st);
- mdlist = conf_get_ident(dv->devname);
- snprintf(st->devname, MD_NAME_MAX + sizeof(DEV_MD_DIR), "%s", 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;
- int anyredundant = 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, increments, c->prefer))
- anydegraded = 1;
- /* for external arrays, metadata is filled for
- * containers only
- */
- if (st->metadata && st->metadata->ss->external)
- continue;
- if (st->err == 0 && !anyredundant)
- anyredundant = 1;
- }
-
- /* now check if there are any new devices found in mdstat */
- if (c->scan)
- new_found = add_new_arrays(mdstat, &statelist);
-
- /* 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);
- if (!new_found) {
- if (oneshot)
- break;
- if (!anyredundant) {
- pr_err("No array with redundancy detected, stopping\n");
- break;
- }
-
- wait_for_events(&delay_for_event, c->delay);
- }
- info.test = 0;
-
- for (stp = &statelist; (st = *stp) != NULL; ) {
- if (st->from_auto && st->err > 5) {
- *stp = st->next;
- if (st->spare_group)
- free(st->spare_group);
-
- free(st);
- } else
- stp = &st->next;
- }
- }
-
- free_statelist(statelist);
-
- if (pidfile)
- unlink(pidfile);
- return 0;
-}
-
-/*
- * wait_for_events() - Waits for events on md devices.
- * @delay_for_event: pointer to current event delay
- * @c_delay: delay from config
- */
-static void wait_for_events(int *delay_for_event, int c_delay)
-{
-#ifndef NO_LIBUDEV
- if (udev_is_available()) {
- if (udev_wait_for_events(*delay_for_event) == UDEV_STATUS_ERROR)
- pr_err("Error while waiting for udev events.\n");
- return;
- }
-#endif
- wait_for_events_mdstat(delay_for_event, c_delay);
-}
-
-/*
- * wait_for_events_mdstat() - Waits for events on mdstat.
- * @delay_for_event: pointer to current event delay
- * @c_delay: delay from config
- */
-static void wait_for_events_mdstat(int *delay_for_event, int c_delay)
-{
- int wait_result = mdstat_wait(*delay_for_event);
-
- if (wait_result < 0) {
- pr_err("Error while waiting for events on mdstat.\n");
- return;
- }
-
- /*
- * Give chance to process new device
- */
- if (wait_result != 0) {
- if (c_delay > FALLBACK_DELAY)
- *delay_for_event = FALLBACK_DELAY;
- } else {
- *delay_for_event = c_delay;
- }
- mdstat_close();
-}
-
-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 = NULL;
- int fd = open(pidfile, O_WRONLY | O_CREAT | O_TRUNC,
- 0644);
- if (fd >= 0)
- pid_file = fdopen(fd, "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;
- }
- manage_fork_fds(0);
- setsid();
- return -1;
-}
-
-/*
- * check_one_sharer() - Checks for other mdmonitor processes running.
- *
- * Return:
- * 0 - no other processes running,
- * 1 - warning,
- * 2 - error, or when scan mode is enabled, and one mdmonitor process already exists
- */
-static int check_one_sharer(int scan)
-{
- int pid;
- FILE *fp, *comm_fp;
- char comm_path[PATH_MAX];
- char comm[TASK_COMM_LEN];
-
- if (!is_directory(MDMON_DIR)) {
- pr_err("%s is not a regular directory.\n", MDMON_DIR);
- return 2;
- }
-
- fp = fopen(AUTOREBUILD_PID_PATH, "r");
- if (!fp) {
- /* PID file does not exist */
- if (errno == ENOENT)
- return 0;
-
- pr_err("Cannot open %s file.\n", AUTOREBUILD_PID_PATH);
- return 2;
- }
-
- if (!is_file(AUTOREBUILD_PID_PATH)) {
- pr_err("%s is not a regular file.\n", AUTOREBUILD_PID_PATH);
- fclose(fp);
- return 2;
- }
-
- if (fscanf(fp, "%d", &pid) != 1) {
- pr_err("Cannot read pid from %s file.\n", AUTOREBUILD_PID_PATH);
- fclose(fp);
- return 2;
- }
-
- snprintf(comm_path, sizeof(comm_path), "/proc/%d/comm", pid);
-
- comm_fp = fopen(comm_path, "r");
- if (!comm_fp) {
- dprintf("Warning: Cannot open %s, continuing\n", comm_path);
- fclose(fp);
- return 1;
- }
-
- if (fscanf(comm_fp, "%15s", comm) == 0) {
- dprintf("Warning: Cannot read comm from %s, continuing\n", comm_path);
- fclose(comm_fp);
- fclose(fp);
- return 1;
- }
-
- if (strncmp(basename(comm), Name, strlen(Name)) == 0) {
- if (scan) {
- pr_err("Only one autorebuild process allowed in scan mode, aborting\n");
- fclose(comm_fp);
- fclose(fp);
- return 2;
- }
- pr_err("Warning: One autorebuild process already running.\n");
- }
- fclose(comm_fp);
- fclose(fp);
- return 0;
-}
-
-/*
- * write_autorebuild_pid() - Writes pid to autorebuild.pid file.
- *
- * Return: 0 on success, 1 on error
- */
-static int write_autorebuild_pid(void)
-{
- FILE *fp;
- int fd;
-
- if (!is_directory(MDMON_DIR)) {
- pr_err("%s is not a regular directory.\n", MDMON_DIR);
- return 1;
- }
-
- fd = open(AUTOREBUILD_PID_PATH, O_WRONLY | O_CREAT | O_TRUNC, 0700);
-
- if (fd < 0) {
- pr_err("Error opening %s file.\n", AUTOREBUILD_PID_PATH);
- return 1;
- }
-
- fp = fdopen(fd, "w");
-
- if (!fp) {
- pr_err("Error opening fd for %s file.\n", AUTOREBUILD_PID_PATH);
- return 1;
- }
-
- fprintf(fp, "%d\n", getpid());
-
- fclose(fp);
- return 0;
-}
-
-#define BASE_MESSAGE "%s event detected on md device %s"
-#define COMPONENT_DEVICE_MESSAGE ", component device %s"
-#define DESCRIPTION_MESSAGE ": %s"
-/*
- * sprint_event_message() - Writes basic message about detected event to destination ptr.
- * @dest: message destination, should be at least the size of BUFSIZ
- * @data: event data
- *
- * Return: 0 on success, 1 on error
- */
-static int sprint_event_message(char *dest, const struct event_data *data)
-{
- if (!dest || !data)
- return 1;
-
- if (data->disc && data->description)
- snprintf(dest, BUFSIZ, BASE_MESSAGE COMPONENT_DEVICE_MESSAGE DESCRIPTION_MESSAGE,
- data->event_name, data->dev, data->disc, data->description);
- else if (data->disc)
- snprintf(dest, BUFSIZ, BASE_MESSAGE COMPONENT_DEVICE_MESSAGE,
- data->event_name, data->dev, data->disc);
- else if (data->description)
- snprintf(dest, BUFSIZ, BASE_MESSAGE DESCRIPTION_MESSAGE,
- data->event_name, data->dev, data->description);
- else
- snprintf(dest, BUFSIZ, BASE_MESSAGE, data->event_name, data->dev);
-
- return 0;
-}
-
-/*
- * get_syslog_event_priority() - Determines event priority.
- * @event_enum: event to be checked
- *
- * Return: LOG_CRIT, LOG_WARNING or LOG_INFO
- */
-static int get_syslog_event_priority(const enum event event_enum)
-{
- if (event_enum > __SYSLOG_PRIORITY_CRITICAL)
- return LOG_CRIT;
- if (event_enum > __SYSLOG_PRIORITY_WARNING)
- return LOG_WARNING;
- return LOG_INFO;
-}
-
-/*
- * is_email_event() - Determines whether email for event should be sent or not.
- * @event_enum: event to be checked
- *
- * Return: true if email should be sent, false otherwise
- */
-static bool is_email_event(const enum event event_enum)
-{
- static const enum event email_events[] = {
- EVENT_FAIL,
- EVENT_FAIL_SPARE,
- EVENT_DEGRADED_ARRAY,
- EVENT_SPARES_MISSING,
- EVENT_TEST_MESSAGE
- };
- unsigned int i;
-
- for (i = 0; i < ARRAY_SIZE(email_events); ++i) {
- if (event_enum == email_events[i])
- return true;
- }
- return false;
-}
-
-/*
- * execute_alert_cmd() - Forks and executes command provided as alert_cmd.
- * @data: event data
- */
-static void execute_alert_cmd(const struct event_data *data)
-{
- int pid = fork();
-
- switch (pid) {
- default:
- waitpid(pid, NULL, 0);
- break;
- case -1:
- pr_err("Cannot fork to execute alert command");
- break;
- case 0:
- execl(info.alert_cmd, info.alert_cmd, data->event_name, data->dev, data->disc, NULL);
- exit(2);
- }
-}
-
-/*
- * send_event_email() - Sends an email about event detected by monitor.
- * @data: event data
- */
-static void send_event_email(const struct event_data *data)
-{
- FILE *mp, *mdstat;
- char buf[BUFSIZ];
- int n;
-
- mp = popen(Sendmail, "w");
- if (!mp) {
- pr_err("Cannot open pipe stream for sendmail.\n");
- return;
- }
-
- signal(SIGPIPE, SIG_IGN);
- if (info.mailfrom)
- fprintf(mp, "From: %s\n", info.mailfrom);
- else
- fprintf(mp, "From: %s monitoring <root>\n", Name);
- fprintf(mp, "To: %s\n", info.mailaddr);
- fprintf(mp, "Subject: %s event on %s:%s\n\n", data->event_name, data->dev, info.hostname);
- fprintf(mp, "This is an automatically generated mail message.\n");
- fprintf(mp, "%s\n", data->message);
-
- mdstat = fopen("/proc/mdstat", "r");
- if (!mdstat) {
- pr_err("Cannot open /proc/mdstat\n");
- pclose(mp);
- return;
- }
-
- fprintf(mp, "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_event_to_syslog() - Logs an event into syslog.
- * @data: event data
- */
-static void log_event_to_syslog(const struct event_data *data)
-{
- int priority;
-
- priority = get_syslog_event_priority(data->event_enum);
-
- syslog(priority, "%s\n", data->message);
-}
-
-/*
- * alert() - Alerts about the monitor event.
- * @event_enum: event to be sent
- * @description: event description
- * @progress: rebuild progress
- * @dev: md device name
- * @disc: component device
- *
- * If needed function executes alert command, sends an email or logs event to syslog.
- */
-static void alert(const enum event event_enum, const char *description, const uint8_t progress,
- const char *dev, const char *disc)
-{
- struct event_data data = {.dev = dev, .disc = disc, .description = description};
-
- if (!dev)
- return;
-
- if (event_enum == EVENT_REBUILD) {
- snprintf(data.event_name, sizeof(data.event_name), "%s%02d",
- map_num_s(events_map, EVENT_REBUILD), progress);
- } else {
- snprintf(data.event_name, sizeof(data.event_name), "%s", map_num_s(events_map, event_enum));
- }
-
- data.event_enum = event_enum;
-
- if (sprint_event_message(data.message, &data) != 0) {
- pr_err("Cannot create event message.\n");
- return;
- }
- pr_err("%s\n", data.message);
-
- if (info.alert_cmd)
- execute_alert_cmd(&data);
-
- if (info.mailaddr && is_email_event(event_enum))
- send_event_email(&data);
-
- if (info.dosyslog)
- log_event_to_syslog(&data);
-}
-
-static int check_array(struct state *st, struct mdstat_ent *mdstat,
- 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; } disks_info[MAX_DISKS];
- struct mdinfo *sra = NULL;
- 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;
- int retval;
- int is_container = 0;
- unsigned long redundancy_only_flags = 0;
-
- if (info.test)
- alert(EVENT_TEST_MESSAGE, NULL, 0, dev, NULL);
-
- retval = 0;
-
- fd = open(dev, O_RDONLY);
- if (fd < 0)
- goto disappeared;
-
- if (st->devnm[0] == 0)
- snprintf(st->devnm, MD_NAME_MAX, "%s", 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++;
- goto out;
- }
-
- if (mse->level == NULL)
- is_container = 1;
-
- if (!is_container && !md_array_active(fd))
- goto disappeared;
-
- if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0)
- goto out;
-
- if (md_get_array_info(fd, &array) < 0)
- goto disappeared;
-
- if (!is_container && map_name(pers, mse->level) > 0)
- redundancy_only_flags |= GET_MISMATCH;
-
- sra = sysfs_read(-1, st->devnm, GET_LEVEL | GET_DISKS | GET_DEVS |
- GET_STATE | redundancy_only_flags);
-
- if (!sra)
- goto disappeared;
-
- /* It's much easier to list what array levels can't
- * have a device disappear than all of them that can
- */
- if (sra->array.level == 0 || sra->array.level == -1) {
- if (!st->err && !st->from_config)
- alert(EVENT_DEVICE_DISAPPEARED, "Wrong-Level", 0, dev, NULL);
- st->err++;
- goto out;
- }
-
- /* 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;
- if (!is_container)
- alert(EVENT_NEW_ARRAY, NULL, 0, st->devname, NULL);
- }
-
- if (st->utime == array.utime && st->failed == sra->array.failed_disks &&
- st->working == sra->array.working_disks &&
- st->spare == sra->array.spare_disks &&
- (mse == NULL || (mse->percent == st->percent))) {
- if ((st->active < st->raid) && st->spare == 0)
- retval = 1;
- goto out;
- }
- if (st->utime == 0 && /* new array */
- mse->pattern && strchr(mse->pattern, '_') /* degraded */)
- alert(EVENT_DEGRADED_ARRAY, NULL, 0, dev, NULL);
-
- if (st->utime == 0 && /* new array */ st->expected_spares > 0 &&
- sra->array.spare_disks < st->expected_spares)
- alert(EVENT_SPARES_MISSING, NULL, 0, dev, NULL);
- if (st->percent < 0 && st->percent != RESYNC_UNKNOWN &&
- mse->percent >= 0)
- alert(EVENT_REBUILD_STARTED, NULL, 0, dev, NULL);
- if (st->percent >= 0 && mse->percent >= 0 &&
- (mse->percent / increments) > (st->percent / increments)) {
- if((mse->percent / increments) == 0)
- alert(EVENT_REBUILD_STARTED, NULL, 0, dev, NULL);
- else
- alert(EVENT_REBUILD, NULL, mse->percent, dev, NULL);
- }
-
- 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.
- */
- if (sra && sra->mismatch_cnt > 0) {
- char cnt[80];
- snprintf(cnt, sizeof(cnt),
- " mismatches found: %d (on raid level %d)",
- sra->mismatch_cnt, sra->array.level);
- alert(EVENT_REBUILD_FINISHED, NULL, 0, dev, cnt);
- } else
- alert(EVENT_REBUILD_FINISHED, NULL, 0, dev, NULL);
- }
- st->percent = mse->percent;
-
- remaining_disks = sra->array.nr_disks;
- for (i = 0; i < MAX_DISKS && remaining_disks > 0; i++) {
- mdu_disk_info_t disc;
- disc.number = i;
- if (md_get_disk_info(fd, &disc) >= 0) {
- disks_info[i].state = disc.state;
- disks_info[i].major = disc.major;
- disks_info[i].minor = disc.minor;
- if (disc.major || disc.minor)
- remaining_disks --;
- } else
- disks_info[i].major = disks_info[i].minor = 0;
- }
- last_disk = i;
-
- if (is_mdstat_ent_subarray(mse)) {
- char *sl;
- snprintf(st->parent_devnm, MD_NAME_MAX, "%s", 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);
-
- 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 && (disks_info[i].major || disks_info[i].minor)) {
- newstate = disks_info[i].state;
- dv = map_dev_preferred(disks_info[i].major, disks_info[i].minor, 1,
- prefer);
- disc.state = newstate;
- disc.major = disks_info[i].major;
- disc.minor = disks_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(EVENT_FAIL, NULL, 0, dev, dv);
- else if ((newstate & (1 << MD_DISK_FAULTY)) &&
- (disc.major || disc.minor) &&
- st->devid[i] == makedev(disc.major,
- disc.minor))
- alert(EVENT_FAIL_SPARE, NULL, 0, dev, dv);
- else if ((newstate&change) & (1 << MD_DISK_SYNC))
- alert(EVENT_SPARE_ACTIVE, NULL, 0, dev, dv);
- }
- st->devstate[i] = newstate;
- st->devid[i] = makedev(disc.major, disc.minor);
- }
- st->active = sra->array.active_disks;
- st->working = sra->array.working_disks;
- st->spare = sra->array.spare_disks;
- st->failed = sra->array.failed_disks;
- st->utime = array.utime;
- st->raid = sra->array.raid_disks;
- st->err = 0;
- if ((st->active < st->raid) && st->spare == 0)
- retval = 1;
-
- out:
- if (sra)
- sysfs_free(sra);
- if (fd >= 0)
- close(fd);
- return retval;
-
- disappeared:
- if (!st->err && !is_container)
- alert(EVENT_DEVICE_DISAPPEARED, NULL, 0, dev, NULL);
- st->err++;
- goto out;
-}
-
-static int add_new_arrays(struct mdstat_ent *mdstat, struct state **statelist)
-{
- struct mdstat_ent *mse;
- int new_found = 0;
- char *name;
-
- 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;
-
- name = get_md_name(mse->devnm);
- if (!name) {
- free(st);
- continue;
- }
-
- snprintf(st->devname, MD_NAME_MAX + sizeof(DEV_MD_DIR), "%s", name);
- if ((fd = open(st->devname, O_RDONLY)) < 0 ||
- md_get_array_info(fd, &array) < 0) {
- /* no such array */
- if (fd >= 0)
- close(fd);
- put_md_name(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;
- snprintf(st->devnm, MD_NAME_MAX, "%s", mse->devnm);
- st->percent = RESYNC_UNKNOWN;
- st->expected_spares = -1;
-
- if (is_mdstat_ent_subarray(mse)) {
- char *sl;
-
- snprintf(st->parent_devnm, MD_NAME_MAX, "%s",
- mse->metadata_version + 10);
- sl = strchr(st->parent_devnm, '/');
- if (sl)
- *sl = 0;
- } else
- st->parent_devnm[0] = 0;
- *statelist = st;
- if (info.test)
- alert(EVENT_TEST_MESSAGE, NULL, 0, st->devname, NULL);
- new_found = 1;
- }
- return new_found;
-}
-
-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, struct spare_criteria *sc)
-{
- 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;
-
- if (to->metadata->ss->external &&
- test_partition_from_id(from->devid[d]))
- continue;
-
- if (devid_matches_criteria(to->metadata, from->devid[d], sc) == false)
- 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,
- struct spare_criteria *sc, 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, sc, 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 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;
- struct spare_criteria sc = {0};
- int d;
- struct state *to = st;
-
- 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 (to->metadata->ss->get_spare_criteria)
- if (to->metadata->ss->get_spare_criteria(to->metadata, to->devname,
- &sc))
- 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, &sc, 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, &sc, 0);
- else
- devid = choose_spare(from, to, domlist,
- &sc);
- if (devid > 0 &&
- move_spare(from->devname, to->devname,
- devid)) {
- alert(EVENT_MOVE_SPARE, NULL, 0, to->devname, from->devname);
- break;
- }
- }
- domain_free(domlist);
- dev_policy_free(sc.pols);
- }
-}
-
-/* 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;
- }
-}
-
-/**
- * free_statelist() - Frees statelist.
- * @statelist: statelist to free
- */
-static void free_statelist(struct state *statelist)
-{
- struct state *tmp = NULL;
-
- while (statelist) {
- if (statelist->spare_group)
- free(statelist->spare_group);
-
- tmp = statelist;
- statelist = statelist->next;
- free(tmp);
- }
-}
-
-/* Not really Monitor but ... */
-int Wait(char *dev)
-{
- char devnm[32];
- dev_t rdev;
- char *tmp;
- int rv = 1;
- int frozen_remaining = 3;
-
- if (!stat_is_blkdev(dev, &rdev))
- return 2;
-
- tmp = devid2devnm(rdev);
- if (!tmp) {
- pr_err("Cannot get md device name.\n");
- return 2;
- }
-
- snprintf(devnm, sizeof(devnm), "%s", tmp);
-
- 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 && 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[SYSFS_MAX_BUF_SIZE];
-
- if (sysfs_init(&mdi, -1, devnm))
- return 2;
- if (sysfs_get_str(&mdi, NULL, "sync_action",
- buf, sizeof(buf)) > 0 &&
- strcmp(buf,"idle\n") != 0) {
- e->percent = RESYNC_UNKNOWN;
- if (strcmp(buf, "frozen\n") == 0) {
- if (frozen_remaining == 0)
- e->percent = RESYNC_NONE;
- else
- frozen_remaining -= 1;
- }
- }
- }
- if (!e || e->percent == RESYNC_NONE) {
- if (e && is_mdstat_ent_external(e)) {
- 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);
- }
-}
-
-/* The state "broken" is used only for RAID0/LINEAR - it's the same as
- * "clean", but used in case the array has one or more members missing.
- */
-static char *clean_states[] = {
- "clear", "inactive", "readonly", "read-auto", "clean", "broken", NULL };
-
-int WaitClean(char *dev, int verbose)
-{
- int fd;
- struct mdinfo *mdi;
- int rv = 1;
- char devnm[32];
-
- if (!stat_is_blkdev(dev, NULL))
- return 2;
- fd = open(dev, O_RDONLY);
- if (fd < 0) {
- if (verbose)
- pr_err("Couldn't open %s: %s\n", dev, strerror(errno));
- return 1;
- }
-
- snprintf(devnm, sizeof(devnm), "%s", 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[SYSFS_MAX_BUF_SIZE];
- 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) <
- (int)ARRAY_SIZE(clean_states) - 1)
- 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 (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;
- pr_err("Error connecting monitor with %s\n", dev);
- }
- 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;
-}
--- /dev/null
+/*
+ * 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 "udev.h"
+#include "xmalloc.h"
+
+#include <sys/wait.h>
+#include <limits.h>
+#include <syslog.h>
+
+#define TASK_COMM_LEN 16
+#define EVENT_NAME_MAX 32
+#define AUTOREBUILD_PID_PATH MDMON_DIR "/autorebuild.pid"
+#define FALLBACK_DELAY 5
+
+/**
+ * struct state - external array or container properties.
+ * @devname: has length of %DEV_MD_DIR + device name + terminating byte
+ * @devnm: to sync with mdstat info
+ * @parent_devnm: or subarray, devnm of parent, for others, ""
+ * @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
+ * @parent: for a subarray it is a link to its container
+ */
+struct state {
+ char devname[MD_NAME_MAX + sizeof(DEV_MD_DIR)];
+ char devnm[MD_NAME_MAX];
+ unsigned int 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[MD_NAME_MAX];
+ struct supertype *metadata;
+ struct state *subarray;
+ struct state *parent;
+ struct state *next;
+};
+
+struct alert_info {
+ char hostname[HOST_NAME_MAX];
+ char *mailaddr;
+ char *mailfrom;
+ char *alert_cmd;
+ int dosyslog;
+ int test;
+} info;
+
+enum event {
+ EVENT_SPARE_ACTIVE = 0,
+ EVENT_NEW_ARRAY,
+ EVENT_MOVE_SPARE,
+ EVENT_TEST_MESSAGE,
+ __SYSLOG_PRIORITY_WARNING,
+ EVENT_REBUILD_STARTED,
+ EVENT_REBUILD,
+ EVENT_REBUILD_FINISHED,
+ EVENT_SPARES_MISSING,
+ __SYSLOG_PRIORITY_CRITICAL,
+ EVENT_DEVICE_DISAPPEARED,
+ EVENT_FAIL,
+ EVENT_FAIL_SPARE,
+ EVENT_DEGRADED_ARRAY,
+ EVENT_UNKNOWN
+};
+
+mapping_t events_map[] = {
+ {"SpareActive", EVENT_SPARE_ACTIVE},
+ {"NewArray", EVENT_NEW_ARRAY},
+ {"MoveSpare", EVENT_MOVE_SPARE},
+ {"TestMessage", EVENT_TEST_MESSAGE},
+ {"RebuildStarted", EVENT_REBUILD_STARTED},
+ {"Rebuild", EVENT_REBUILD},
+ {"RebuildFinished", EVENT_REBUILD_FINISHED},
+ {"SparesMissing", EVENT_SPARES_MISSING},
+ {"DeviceDisappeared", EVENT_DEVICE_DISAPPEARED},
+ {"Fail", EVENT_FAIL},
+ {"FailSpare", EVENT_FAIL_SPARE},
+ {"DegradedArray", EVENT_DEGRADED_ARRAY},
+ {NULL, EVENT_UNKNOWN}
+};
+
+struct event_data {
+ enum event event_enum;
+ /*
+ * @event_name: Rebuild event name must be in form "RebuildXX", where XX is rebuild progress.
+ */
+ char event_name[EVENT_NAME_MAX];
+ char message[BUFSIZ];
+ const char *description;
+ const char *dev;
+ const char *disc;
+};
+
+static int add_new_arrays(struct mdstat_ent *mdstat, struct state **statelist);
+static void try_spare_migration(struct state *statelist);
+static void link_containers_with_subarrays(struct state *list);
+static void free_statelist(struct state *statelist);
+static int check_array(struct state *st, struct mdstat_ent *mdstat, int increments, char *prefer);
+static int check_one_sharer(int scan);
+static void link_containers_with_subarrays(struct state *list);
+static int make_daemon(char *pidfile);
+static void try_spare_migration(struct state *statelist);
+static void wait_for_events(int *delay_for_event, int c_delay);
+static void wait_for_events_mdstat(int *delay_for_event, int c_delay);
+static int write_autorebuild_pid(void);
+
+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 if --scan
+ * was given. We get an initial list from config file and add anything
+ * that appears in /proc/mdstat
+ */
+
+ struct state *statelist = NULL;
+ int finished = 0;
+ struct mdstat_ent *mdstat = NULL;
+ char *mailfrom;
+ struct mddev_ident *mdlist;
+ int delay_for_event = c->delay;
+
+ if (devlist && c->scan) {
+ pr_err("Devices list and --scan option cannot be combined - not monitoring.\n");
+ return 1;
+ }
+
+ if (!mailaddr)
+ mailaddr = conf_get_mailaddr();
+
+ if (!alert_cmd)
+ alert_cmd = conf_get_program();
+
+ mailfrom = conf_get_mailfrom();
+
+ if (c->scan && !mailaddr && !alert_cmd && !dosyslog) {
+ pr_err("No mail address or alert command - not monitoring.\n");
+ return 1;
+ }
+
+ if (c->verbose) {
+ pr_err("Monitor is started with delay %ds\n", c->delay);
+ if (mailaddr)
+ pr_err("Monitor using email address %s\n", mailaddr);
+ if (alert_cmd)
+ pr_err("Monitor using program %s\n", alert_cmd);
+ }
+
+ info.alert_cmd = alert_cmd;
+ info.mailaddr = mailaddr;
+ info.mailfrom = mailfrom;
+ info.dosyslog = dosyslog;
+ info.test = c->test;
+
+ if (s_gethostname(info.hostname, sizeof(info.hostname)) != 0) {
+ pr_err("Cannot get hostname.\n");
+ return 1;
+ }
+
+ if (mkdir(MDMON_DIR, 0700) < 0 && errno != EEXIST) {
+ pr_err("Failed to create directory " MDMON_DIR ": %s\n", strerror(errno));
+ return 1;
+ }
+
+ if (share){
+ if (check_one_sharer(c->scan) == 2)
+ return 1;
+ }
+
+ if (daemonise) {
+ int rv = make_daemon(pidfile);
+ if (rv >= 0)
+ return rv;
+ }
+
+ if (share)
+ if (write_autorebuild_pid() != 0)
+ return 1;
+
+ if (devlist == NULL) {
+ mdlist = conf_get_ident(NULL);
+ for (; mdlist; mdlist = mdlist->next) {
+ struct state *st;
+
+ if (mdlist->devname == NULL)
+ continue;
+ if (is_devname_ignore(mdlist->devname) == true)
+ continue;
+ if (!is_mddev(mdlist->devname))
+ continue;
+
+ st = xcalloc(1, sizeof *st);
+ snprintf(st->devname, MD_NAME_MAX + sizeof(DEV_MD_DIR), DEV_MD_DIR "%s",
+ basename(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 state *st;
+
+ if (!is_mddev(dv->devname))
+ continue;
+
+ st = xcalloc(1, sizeof *st);
+ mdlist = conf_get_ident(dv->devname);
+ snprintf(st->devname, MD_NAME_MAX + sizeof(DEV_MD_DIR), "%s", 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;
+ int anyredundant = 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, increments, c->prefer))
+ anydegraded = 1;
+ /* for external arrays, metadata is filled for
+ * containers only
+ */
+ if (st->metadata && st->metadata->ss->external)
+ continue;
+ if (st->err == 0 && !anyredundant)
+ anyredundant = 1;
+ }
+
+ /* now check if there are any new devices found in mdstat */
+ if (c->scan)
+ new_found = add_new_arrays(mdstat, &statelist);
+
+ /* 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);
+ if (!new_found) {
+ if (oneshot)
+ break;
+ if (!anyredundant) {
+ pr_err("No array with redundancy detected, stopping\n");
+ break;
+ }
+
+ wait_for_events(&delay_for_event, c->delay);
+ }
+ info.test = 0;
+
+ for (stp = &statelist; (st = *stp) != NULL; ) {
+ if (st->from_auto && st->err > 5) {
+ *stp = st->next;
+ if (st->spare_group)
+ free(st->spare_group);
+
+ free(st);
+ } else
+ stp = &st->next;
+ }
+ }
+
+ free_statelist(statelist);
+
+ if (pidfile)
+ unlink(pidfile);
+ return 0;
+}
+
+/*
+ * wait_for_events() - Waits for events on md devices.
+ * @delay_for_event: pointer to current event delay
+ * @c_delay: delay from config
+ */
+static void wait_for_events(int *delay_for_event, int c_delay)
+{
+#ifndef NO_LIBUDEV
+ if (udev_is_available()) {
+ if (udev_wait_for_events(*delay_for_event) == UDEV_STATUS_ERROR)
+ pr_err("Error while waiting for udev events.\n");
+ return;
+ }
+#endif
+ wait_for_events_mdstat(delay_for_event, c_delay);
+}
+
+/*
+ * wait_for_events_mdstat() - Waits for events on mdstat.
+ * @delay_for_event: pointer to current event delay
+ * @c_delay: delay from config
+ */
+static void wait_for_events_mdstat(int *delay_for_event, int c_delay)
+{
+ int wait_result = mdstat_wait(*delay_for_event);
+
+ if (wait_result < 0) {
+ pr_err("Error while waiting for events on mdstat.\n");
+ return;
+ }
+
+ /*
+ * Give chance to process new device
+ */
+ if (wait_result != 0) {
+ if (c_delay > FALLBACK_DELAY)
+ *delay_for_event = FALLBACK_DELAY;
+ } else {
+ *delay_for_event = c_delay;
+ }
+ mdstat_close();
+}
+
+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 = NULL;
+ int fd = open(pidfile, O_WRONLY | O_CREAT | O_TRUNC,
+ 0644);
+ if (fd >= 0)
+ pid_file = fdopen(fd, "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;
+ }
+ manage_fork_fds(0);
+ setsid();
+ return -1;
+}
+
+/*
+ * check_one_sharer() - Checks for other mdmonitor processes running.
+ *
+ * Return:
+ * 0 - no other processes running,
+ * 1 - warning,
+ * 2 - error, or when scan mode is enabled, and one mdmonitor process already exists
+ */
+static int check_one_sharer(int scan)
+{
+ int pid;
+ FILE *fp, *comm_fp;
+ char comm_path[PATH_MAX];
+ char comm[TASK_COMM_LEN];
+
+ if (!is_directory(MDMON_DIR)) {
+ pr_err("%s is not a regular directory.\n", MDMON_DIR);
+ return 2;
+ }
+
+ fp = fopen(AUTOREBUILD_PID_PATH, "r");
+ if (!fp) {
+ /* PID file does not exist */
+ if (errno == ENOENT)
+ return 0;
+
+ pr_err("Cannot open %s file.\n", AUTOREBUILD_PID_PATH);
+ return 2;
+ }
+
+ if (!is_file(AUTOREBUILD_PID_PATH)) {
+ pr_err("%s is not a regular file.\n", AUTOREBUILD_PID_PATH);
+ fclose(fp);
+ return 2;
+ }
+
+ if (fscanf(fp, "%d", &pid) != 1) {
+ pr_err("Cannot read pid from %s file.\n", AUTOREBUILD_PID_PATH);
+ fclose(fp);
+ return 2;
+ }
+
+ snprintf(comm_path, sizeof(comm_path), "/proc/%d/comm", pid);
+
+ comm_fp = fopen(comm_path, "r");
+ if (!comm_fp) {
+ dprintf("Warning: Cannot open %s, continuing\n", comm_path);
+ fclose(fp);
+ return 1;
+ }
+
+ if (fscanf(comm_fp, "%15s", comm) == 0) {
+ dprintf("Warning: Cannot read comm from %s, continuing\n", comm_path);
+ fclose(comm_fp);
+ fclose(fp);
+ return 1;
+ }
+
+ if (strncmp(basename(comm), Name, strlen(Name)) == 0) {
+ if (scan) {
+ pr_err("Only one autorebuild process allowed in scan mode, aborting\n");
+ fclose(comm_fp);
+ fclose(fp);
+ return 2;
+ }
+ pr_err("Warning: One autorebuild process already running.\n");
+ }
+ fclose(comm_fp);
+ fclose(fp);
+ return 0;
+}
+
+/*
+ * write_autorebuild_pid() - Writes pid to autorebuild.pid file.
+ *
+ * Return: 0 on success, 1 on error
+ */
+static int write_autorebuild_pid(void)
+{
+ FILE *fp;
+ int fd;
+
+ if (!is_directory(MDMON_DIR)) {
+ pr_err("%s is not a regular directory.\n", MDMON_DIR);
+ return 1;
+ }
+
+ fd = open(AUTOREBUILD_PID_PATH, O_WRONLY | O_CREAT | O_TRUNC, 0700);
+
+ if (fd < 0) {
+ pr_err("Error opening %s file.\n", AUTOREBUILD_PID_PATH);
+ return 1;
+ }
+
+ fp = fdopen(fd, "w");
+
+ if (!fp) {
+ pr_err("Error opening fd for %s file.\n", AUTOREBUILD_PID_PATH);
+ return 1;
+ }
+
+ fprintf(fp, "%d\n", getpid());
+
+ fclose(fp);
+ return 0;
+}
+
+#define BASE_MESSAGE "%s event detected on md device %s"
+#define COMPONENT_DEVICE_MESSAGE ", component device %s"
+#define DESCRIPTION_MESSAGE ": %s"
+/*
+ * sprint_event_message() - Writes basic message about detected event to destination ptr.
+ * @dest: message destination, should be at least the size of BUFSIZ
+ * @data: event data
+ *
+ * Return: 0 on success, 1 on error
+ */
+static int sprint_event_message(char *dest, const struct event_data *data)
+{
+ if (!dest || !data)
+ return 1;
+
+ if (data->disc && data->description)
+ snprintf(dest, BUFSIZ, BASE_MESSAGE COMPONENT_DEVICE_MESSAGE DESCRIPTION_MESSAGE,
+ data->event_name, data->dev, data->disc, data->description);
+ else if (data->disc)
+ snprintf(dest, BUFSIZ, BASE_MESSAGE COMPONENT_DEVICE_MESSAGE,
+ data->event_name, data->dev, data->disc);
+ else if (data->description)
+ snprintf(dest, BUFSIZ, BASE_MESSAGE DESCRIPTION_MESSAGE,
+ data->event_name, data->dev, data->description);
+ else
+ snprintf(dest, BUFSIZ, BASE_MESSAGE, data->event_name, data->dev);
+
+ return 0;
+}
+
+/*
+ * get_syslog_event_priority() - Determines event priority.
+ * @event_enum: event to be checked
+ *
+ * Return: LOG_CRIT, LOG_WARNING or LOG_INFO
+ */
+static int get_syslog_event_priority(const enum event event_enum)
+{
+ if (event_enum > __SYSLOG_PRIORITY_CRITICAL)
+ return LOG_CRIT;
+ if (event_enum > __SYSLOG_PRIORITY_WARNING)
+ return LOG_WARNING;
+ return LOG_INFO;
+}
+
+/*
+ * is_email_event() - Determines whether email for event should be sent or not.
+ * @event_enum: event to be checked
+ *
+ * Return: true if email should be sent, false otherwise
+ */
+static bool is_email_event(const enum event event_enum)
+{
+ static const enum event email_events[] = {
+ EVENT_FAIL,
+ EVENT_FAIL_SPARE,
+ EVENT_DEGRADED_ARRAY,
+ EVENT_SPARES_MISSING,
+ EVENT_TEST_MESSAGE
+ };
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(email_events); ++i) {
+ if (event_enum == email_events[i])
+ return true;
+ }
+ return false;
+}
+
+/*
+ * execute_alert_cmd() - Forks and executes command provided as alert_cmd.
+ * @data: event data
+ */
+static void execute_alert_cmd(const struct event_data *data)
+{
+ int pid = fork();
+
+ switch (pid) {
+ default:
+ waitpid(pid, NULL, 0);
+ break;
+ case -1:
+ pr_err("Cannot fork to execute alert command");
+ break;
+ case 0:
+ execl(info.alert_cmd, info.alert_cmd, data->event_name, data->dev, data->disc, NULL);
+ exit(2);
+ }
+}
+
+/*
+ * send_event_email() - Sends an email about event detected by monitor.
+ * @data: event data
+ */
+static void send_event_email(const struct event_data *data)
+{
+ FILE *mp, *mdstat;
+ char buf[BUFSIZ];
+ int n;
+
+ mp = popen(Sendmail, "w");
+ if (!mp) {
+ pr_err("Cannot open pipe stream for sendmail.\n");
+ return;
+ }
+
+ signal(SIGPIPE, SIG_IGN);
+ if (info.mailfrom)
+ fprintf(mp, "From: %s\n", info.mailfrom);
+ else
+ fprintf(mp, "From: %s monitoring <root>\n", Name);
+ fprintf(mp, "To: %s\n", info.mailaddr);
+ fprintf(mp, "Subject: %s event on %s:%s\n\n", data->event_name, data->dev, info.hostname);
+ fprintf(mp, "This is an automatically generated mail message.\n");
+ fprintf(mp, "%s\n", data->message);
+
+ mdstat = fopen("/proc/mdstat", "r");
+ if (!mdstat) {
+ pr_err("Cannot open /proc/mdstat\n");
+ pclose(mp);
+ return;
+ }
+
+ fprintf(mp, "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_event_to_syslog() - Logs an event into syslog.
+ * @data: event data
+ */
+static void log_event_to_syslog(const struct event_data *data)
+{
+ int priority;
+
+ priority = get_syslog_event_priority(data->event_enum);
+
+ syslog(priority, "%s\n", data->message);
+}
+
+/*
+ * alert() - Alerts about the monitor event.
+ * @event_enum: event to be sent
+ * @description: event description
+ * @progress: rebuild progress
+ * @dev: md device name
+ * @disc: component device
+ *
+ * If needed function executes alert command, sends an email or logs event to syslog.
+ */
+static void alert(const enum event event_enum, const char *description, const uint8_t progress,
+ const char *dev, const char *disc)
+{
+ struct event_data data = {.dev = dev, .disc = disc, .description = description};
+
+ if (!dev)
+ return;
+
+ if (event_enum == EVENT_REBUILD) {
+ snprintf(data.event_name, sizeof(data.event_name), "%s%02d",
+ map_num_s(events_map, EVENT_REBUILD), progress);
+ } else {
+ snprintf(data.event_name, sizeof(data.event_name), "%s", map_num_s(events_map, event_enum));
+ }
+
+ data.event_enum = event_enum;
+
+ if (sprint_event_message(data.message, &data) != 0) {
+ pr_err("Cannot create event message.\n");
+ return;
+ }
+ pr_err("%s\n", data.message);
+
+ if (info.alert_cmd)
+ execute_alert_cmd(&data);
+
+ if (info.mailaddr && is_email_event(event_enum))
+ send_event_email(&data);
+
+ if (info.dosyslog)
+ log_event_to_syslog(&data);
+}
+
+static int check_array(struct state *st, struct mdstat_ent *mdstat,
+ 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; } disks_info[MAX_DISKS];
+ struct mdinfo *sra = NULL;
+ 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;
+ int retval;
+ int is_container = 0;
+ unsigned long redundancy_only_flags = 0;
+
+ if (info.test)
+ alert(EVENT_TEST_MESSAGE, NULL, 0, dev, NULL);
+
+ retval = 0;
+
+ fd = open(dev, O_RDONLY);
+ if (fd < 0)
+ goto disappeared;
+
+ if (st->devnm[0] == 0)
+ snprintf(st->devnm, MD_NAME_MAX, "%s", 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++;
+ goto out;
+ }
+
+ if (mse->level == NULL)
+ is_container = 1;
+
+ if (!is_container && !md_array_active(fd))
+ goto disappeared;
+
+ if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0)
+ goto out;
+
+ if (md_get_array_info(fd, &array) < 0)
+ goto disappeared;
+
+ if (!is_container && map_name(pers, mse->level) > 0)
+ redundancy_only_flags |= GET_MISMATCH;
+
+ sra = sysfs_read(-1, st->devnm, GET_LEVEL | GET_DISKS | GET_DEVS |
+ GET_STATE | redundancy_only_flags);
+
+ if (!sra)
+ goto disappeared;
+
+ /* It's much easier to list what array levels can't
+ * have a device disappear than all of them that can
+ */
+ if (sra->array.level == 0 || sra->array.level == -1) {
+ if (!st->err && !st->from_config)
+ alert(EVENT_DEVICE_DISAPPEARED, "Wrong-Level", 0, dev, NULL);
+ st->err++;
+ goto out;
+ }
+
+ /* 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;
+ if (!is_container)
+ alert(EVENT_NEW_ARRAY, NULL, 0, st->devname, NULL);
+ }
+
+ if (st->utime == array.utime && st->failed == sra->array.failed_disks &&
+ st->working == sra->array.working_disks &&
+ st->spare == sra->array.spare_disks &&
+ (mse == NULL || (mse->percent == st->percent))) {
+ if ((st->active < st->raid) && st->spare == 0)
+ retval = 1;
+ goto out;
+ }
+ if (st->utime == 0 && /* new array */
+ mse->pattern && strchr(mse->pattern, '_') /* degraded */)
+ alert(EVENT_DEGRADED_ARRAY, NULL, 0, dev, NULL);
+
+ if (st->utime == 0 && /* new array */ st->expected_spares > 0 &&
+ sra->array.spare_disks < st->expected_spares)
+ alert(EVENT_SPARES_MISSING, NULL, 0, dev, NULL);
+ if (st->percent < 0 && st->percent != RESYNC_UNKNOWN &&
+ mse->percent >= 0)
+ alert(EVENT_REBUILD_STARTED, NULL, 0, dev, NULL);
+ if (st->percent >= 0 && mse->percent >= 0 &&
+ (mse->percent / increments) > (st->percent / increments)) {
+ if((mse->percent / increments) == 0)
+ alert(EVENT_REBUILD_STARTED, NULL, 0, dev, NULL);
+ else
+ alert(EVENT_REBUILD, NULL, mse->percent, dev, NULL);
+ }
+
+ 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.
+ */
+ if (sra && sra->mismatch_cnt > 0) {
+ char cnt[80];
+ snprintf(cnt, sizeof(cnt),
+ " mismatches found: %d (on raid level %d)",
+ sra->mismatch_cnt, sra->array.level);
+ alert(EVENT_REBUILD_FINISHED, NULL, 0, dev, cnt);
+ } else
+ alert(EVENT_REBUILD_FINISHED, NULL, 0, dev, NULL);
+ }
+ st->percent = mse->percent;
+
+ remaining_disks = sra->array.nr_disks;
+ for (i = 0; i < MAX_DISKS && remaining_disks > 0; i++) {
+ mdu_disk_info_t disc;
+ disc.number = i;
+ if (md_get_disk_info(fd, &disc) >= 0) {
+ disks_info[i].state = disc.state;
+ disks_info[i].major = disc.major;
+ disks_info[i].minor = disc.minor;
+ if (disc.major || disc.minor)
+ remaining_disks --;
+ } else
+ disks_info[i].major = disks_info[i].minor = 0;
+ }
+ last_disk = i;
+
+ if (is_mdstat_ent_subarray(mse)) {
+ char *sl;
+ snprintf(st->parent_devnm, MD_NAME_MAX, "%s", 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);
+
+ 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 && (disks_info[i].major || disks_info[i].minor)) {
+ newstate = disks_info[i].state;
+ dv = map_dev_preferred(disks_info[i].major, disks_info[i].minor, 1,
+ prefer);
+ disc.state = newstate;
+ disc.major = disks_info[i].major;
+ disc.minor = disks_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(EVENT_FAIL, NULL, 0, dev, dv);
+ else if ((newstate & (1 << MD_DISK_FAULTY)) &&
+ (disc.major || disc.minor) &&
+ st->devid[i] == makedev(disc.major,
+ disc.minor))
+ alert(EVENT_FAIL_SPARE, NULL, 0, dev, dv);
+ else if ((newstate&change) & (1 << MD_DISK_SYNC))
+ alert(EVENT_SPARE_ACTIVE, NULL, 0, dev, dv);
+ }
+ st->devstate[i] = newstate;
+ st->devid[i] = makedev(disc.major, disc.minor);
+ }
+ st->active = sra->array.active_disks;
+ st->working = sra->array.working_disks;
+ st->spare = sra->array.spare_disks;
+ st->failed = sra->array.failed_disks;
+ st->utime = array.utime;
+ st->raid = sra->array.raid_disks;
+ st->err = 0;
+ if ((st->active < st->raid) && st->spare == 0)
+ retval = 1;
+
+ out:
+ if (sra)
+ sysfs_free(sra);
+ if (fd >= 0)
+ close(fd);
+ return retval;
+
+ disappeared:
+ if (!st->err && !is_container)
+ alert(EVENT_DEVICE_DISAPPEARED, NULL, 0, dev, NULL);
+ st->err++;
+ goto out;
+}
+
+static int add_new_arrays(struct mdstat_ent *mdstat, struct state **statelist)
+{
+ struct mdstat_ent *mse;
+ int new_found = 0;
+ char *name;
+
+ 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;
+
+ name = get_md_name(mse->devnm);
+ if (!name) {
+ free(st);
+ continue;
+ }
+
+ snprintf(st->devname, MD_NAME_MAX + sizeof(DEV_MD_DIR), "%s", name);
+ if ((fd = open(st->devname, O_RDONLY)) < 0 ||
+ md_get_array_info(fd, &array) < 0) {
+ /* no such array */
+ if (fd >= 0)
+ close(fd);
+ put_md_name(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;
+ snprintf(st->devnm, MD_NAME_MAX, "%s", mse->devnm);
+ st->percent = RESYNC_UNKNOWN;
+ st->expected_spares = -1;
+
+ if (is_mdstat_ent_subarray(mse)) {
+ char *sl;
+
+ snprintf(st->parent_devnm, MD_NAME_MAX, "%s",
+ mse->metadata_version + 10);
+ sl = strchr(st->parent_devnm, '/');
+ if (sl)
+ *sl = 0;
+ } else
+ st->parent_devnm[0] = 0;
+ *statelist = st;
+ if (info.test)
+ alert(EVENT_TEST_MESSAGE, NULL, 0, st->devname, NULL);
+ new_found = 1;
+ }
+ return new_found;
+}
+
+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, struct spare_criteria *sc)
+{
+ 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;
+
+ if (to->metadata->ss->external &&
+ test_partition_from_id(from->devid[d]))
+ continue;
+
+ if (devid_matches_criteria(to->metadata, from->devid[d], sc) == false)
+ 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,
+ struct spare_criteria *sc, 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, sc, 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 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;
+ struct spare_criteria sc = {0};
+ int d;
+ struct state *to = st;
+
+ 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 (to->metadata->ss->get_spare_criteria)
+ if (to->metadata->ss->get_spare_criteria(to->metadata, to->devname,
+ &sc))
+ 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, &sc, 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, &sc, 0);
+ else
+ devid = choose_spare(from, to, domlist,
+ &sc);
+ if (devid > 0 &&
+ move_spare(from->devname, to->devname,
+ devid)) {
+ alert(EVENT_MOVE_SPARE, NULL, 0, to->devname, from->devname);
+ break;
+ }
+ }
+ domain_free(domlist);
+ dev_policy_free(sc.pols);
+ }
+}
+
+/* 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;
+ }
+}
+
+/**
+ * free_statelist() - Frees statelist.
+ * @statelist: statelist to free
+ */
+static void free_statelist(struct state *statelist)
+{
+ struct state *tmp = NULL;
+
+ while (statelist) {
+ if (statelist->spare_group)
+ free(statelist->spare_group);
+
+ tmp = statelist;
+ statelist = statelist->next;
+ free(tmp);
+ }
+}
+
+/* Not really Monitor but ... */
+int Wait(char *dev)
+{
+ char devnm[32];
+ dev_t rdev;
+ char *tmp;
+ int rv = 1;
+ int frozen_remaining = 3;
+
+ if (!stat_is_blkdev(dev, &rdev))
+ return 2;
+
+ tmp = devid2devnm(rdev);
+ if (!tmp) {
+ pr_err("Cannot get md device name.\n");
+ return 2;
+ }
+
+ snprintf(devnm, sizeof(devnm), "%s", tmp);
+
+ 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 && 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[SYSFS_MAX_BUF_SIZE];
+
+ if (sysfs_init(&mdi, -1, devnm))
+ return 2;
+ if (sysfs_get_str(&mdi, NULL, "sync_action",
+ buf, sizeof(buf)) > 0 &&
+ strcmp(buf,"idle\n") != 0) {
+ e->percent = RESYNC_UNKNOWN;
+ if (strcmp(buf, "frozen\n") == 0) {
+ if (frozen_remaining == 0)
+ e->percent = RESYNC_NONE;
+ else
+ frozen_remaining -= 1;
+ }
+ }
+ }
+ if (!e || e->percent == RESYNC_NONE) {
+ if (e && is_mdstat_ent_external(e)) {
+ 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);
+ }
+}
+
+/* The state "broken" is used only for RAID0/LINEAR - it's the same as
+ * "clean", but used in case the array has one or more members missing.
+ */
+static char *clean_states[] = {
+ "clear", "inactive", "readonly", "read-auto", "clean", "broken", NULL };
+
+int WaitClean(char *dev, int verbose)
+{
+ int fd;
+ struct mdinfo *mdi;
+ int rv = 1;
+ char devnm[32];
+
+ if (!stat_is_blkdev(dev, NULL))
+ return 2;
+ fd = open(dev, O_RDONLY);
+ if (fd < 0) {
+ if (verbose)
+ pr_err("Couldn't open %s: %s\n", dev, strerror(errno));
+ return 1;
+ }
+
+ snprintf(devnm, sizeof(devnm), "%s", 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[SYSFS_MAX_BUF_SIZE];
+ 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) <
+ (int)ARRAY_SIZE(clean_states) - 1)
+ 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 (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;
+ pr_err("Error connecting monitor with %s\n", dev);
+ }
+ 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;
+}
projects / mdadm.git / commitdiff