+/*
+ * mdmon - monitor external metadata arrays
+ *
+ * Copyright (C) 2007-2009 Neil Brown <neilb@suse.de>
+ * Copyright (C) 2007-2009 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
/*
* The management thread for monitoring active md arrays.
* - When a device is added to the container, we add it to the metadata
* as a spare.
*
- * - assist with activating spares by opening relevant sysfs file.
+ * - Deal with degraded array
+ * We only do this when first noticing the array is degraded.
+ * This can be when we first see the array, when sync completes or
+ * when recovery completes.
+ *
+ * Check if number of failed devices suggests recovery is needed, and
+ * skip if not.
+ * Ask metadata to allocate a spare device
+ * Add device as not in_sync and give a role
+ * Update metadata.
+ * Open sysfs files and pass to monitor.
+ * Make sure that monitor Starts recovery....
*
* - Pass on metadata updates from external programs such as
* mdadm creating a new array.
#endif
#include "mdadm.h"
#include "mdmon.h"
+#include <sys/syscall.h>
#include <sys/socket.h>
+#include <signal.h>
static void close_aa(struct active_array *aa)
{
struct mdinfo *d;
- for (d = aa->info.devs; d; d = d->next)
+ for (d = aa->info.devs; d; d = d->next) {
+ close(d->recovery_fd);
close(d->state_fd);
+ }
close(aa->action_fd);
close(aa->info.state_fd);
close(aa->resync_start_fd);
- close(aa->sync_pos_fd);
}
static void free_aa(struct active_array *aa)
/* Note that this doesn't close fds if they are being used
* by a clone. ->container will be set for a clone
*/
+ dprintf("%s: devnum: %d\n", __func__, aa->devnum);
if (!aa->container)
close_aa(aa);
while (aa->info.devs) {
free(aa);
}
-static void write_wakeup(struct supertype *c)
+static struct active_array *duplicate_aa(struct active_array *aa)
{
- static struct md_generic_cmd cmd = { .action = md_action_ping_monitor };
- int err;
+ struct active_array *newa = malloc(sizeof(*newa));
+ struct mdinfo **dp1, **dp2;
+
+ *newa = *aa;
+ newa->next = NULL;
+ newa->replaces = NULL;
+ newa->info.next = NULL;
+
+ dp2 = &newa->info.devs;
+
+ for (dp1 = &aa->info.devs; *dp1; dp1 = &(*dp1)->next) {
+ struct mdinfo *d;
+ if ((*dp1)->state_fd < 0)
+ continue;
- active_cmd = &cmd;
+ d = malloc(sizeof(*d));
+ *d = **dp1;
+ *dp2 = d;
+ dp2 = & d->next;
+ }
+ *dp2 = NULL;
- /* send the monitor thread a pointer to the ping action */
- write(c->mgr_pipe[1], &err, 1);
- read(c->mon_pipe[0], &err, 1);
+ return newa;
+}
+
+static void wakeup_monitor(void)
+{
+ /* tgkill(getpid(), mon_tid, SIGUSR1); */
+ int pid = getpid();
+ syscall(SYS_tgkill, pid, mon_tid, SIGUSR1);
+}
+
+static void remove_old(void)
+{
+ if (discard_this) {
+ discard_this->next = NULL;
+ free_aa(discard_this);
+ if (pending_discard == discard_this)
+ pending_discard = NULL;
+ discard_this = NULL;
+ wakeup_monitor();
+ }
}
static void replace_array(struct supertype *container,
* and put it on 'discard_this'. We take it from there
* and discard it.
*/
-
+ remove_old();
while (pending_discard) {
while (discard_this == NULL)
sleep(1);
- if (discard_this != pending_discard)
- abort();
- discard_this->next = NULL;
- free_aa(discard_this);
- discard_this = NULL;
- pending_discard = NULL;
+ remove_old();
}
pending_discard = old;
new->replaces = old;
new->next = container->arrays;
container->arrays = new;
- write_wakeup(container);
+ wakeup_monitor();
+}
+
+struct metadata_update *update_queue = NULL;
+struct metadata_update *update_queue_handled = NULL;
+struct metadata_update *update_queue_pending = NULL;
+
+static void free_updates(struct metadata_update **update)
+{
+ while (*update) {
+ struct metadata_update *this = *update;
+
+ *update = this->next;
+ free(this->buf);
+ free(this->space);
+ free(this);
+ }
+}
+
+void check_update_queue(struct supertype *container)
+{
+ free_updates(&update_queue_handled);
+
+ if (update_queue == NULL &&
+ update_queue_pending) {
+ update_queue = update_queue_pending;
+ update_queue_pending = NULL;
+ wakeup_monitor();
+ }
}
+static void queue_metadata_update(struct metadata_update *mu)
+{
+ struct metadata_update **qp;
+
+ qp = &update_queue_pending;
+ while (*qp)
+ qp = & ((*qp)->next);
+ *qp = mu;
+}
+
+static void add_disk_to_container(struct supertype *st, struct mdinfo *sd)
+{
+ int dfd;
+ char nm[20];
+ struct supertype *st2;
+ struct metadata_update *update = NULL;
+ struct mdinfo info;
+ mdu_disk_info_t dk = {
+ .number = -1,
+ .major = sd->disk.major,
+ .minor = sd->disk.minor,
+ .raid_disk = -1,
+ .state = 0,
+ };
+
+ dprintf("%s: add %d:%d to container\n",
+ __func__, sd->disk.major, sd->disk.minor);
+
+ sd->next = st->devs;
+ st->devs = sd;
+
+ sprintf(nm, "%d:%d", sd->disk.major, sd->disk.minor);
+ dfd = dev_open(nm, O_RDWR);
+ if (dfd < 0)
+ return;
+
+ /* Check the metadata and see if it is already part of this
+ * array
+ */
+ st2 = dup_super(st);
+ if (st2->ss->load_super(st2, dfd, NULL) == 0) {
+ st2->ss->getinfo_super(st, &info);
+ if (st->ss->compare_super(st, st2) == 0 &&
+ info.disk.raid_disk >= 0) {
+ /* Looks like a good member of array.
+ * Just accept it.
+ * mdadm will incorporate any parts into
+ * active arrays.
+ */
+ st2->ss->free_super(st2);
+ return;
+ }
+ }
+ st2->ss->free_super(st2);
+
+ st->update_tail = &update;
+ st->ss->add_to_super(st, &dk, dfd, NULL);
+ st->ss->write_init_super(st);
+ queue_metadata_update(update);
+ st->update_tail = NULL;
+}
static void manage_container(struct mdstat_ent *mdstat,
struct supertype *container)
* array ignoring any metadata on it.
* FIXME should we look for compatible metadata and take hints
* about spare assignment.... probably not.
- *
*/
if (mdstat->devcnt != container->devcnt) {
+ struct mdinfo **cdp, *cd, *di, *mdi;
+ int found;
+
/* read /sys/block/NAME/md/dev-??/block/dev to find out
* what is there, and compare with container->info.devs
* To see what is removed and what is added.
* These need to be remove from, or added to, the array
*/
- // FIXME
+ mdi = sysfs_read(-1, mdstat->devnum, GET_DEVS|SKIP_GONE_DEVS);
+ if (!mdi) {
+ /* invalidate the current count so we can try again */
+ container->devcnt = -1;
+ return;
+ }
+
+ /* check for removals */
+ for (cdp = &container->devs; *cdp; ) {
+ found = 0;
+ for (di = mdi->devs; di; di = di->next)
+ if (di->disk.major == (*cdp)->disk.major &&
+ di->disk.minor == (*cdp)->disk.minor) {
+ found = 1;
+ break;
+ }
+ if (!found) {
+ cd = *cdp;
+ *cdp = (*cdp)->next;
+ free(cd);
+ } else
+ cdp = &(*cdp)->next;
+ }
+
+ /* check for additions */
+ for (di = mdi->devs; di; di = di->next) {
+ for (cd = container->devs; cd; cd = cd->next)
+ if (di->disk.major == cd->disk.major &&
+ di->disk.minor == cd->disk.minor)
+ break;
+ if (!cd) {
+ struct mdinfo *newd = malloc(sizeof(*newd));
+
+ if (!newd) {
+ container->devcnt = -1;
+ continue;
+ }
+ *newd = *di;
+ add_disk_to_container(container, newd);
+ }
+ }
+ sysfs_free(mdi);
container->devcnt = mdstat->devcnt;
}
}
* being requested.
* Unfortunately decreases in raid_disks don't show up in
* mdstat until the reshape completes FIXME.
+ *
+ * Actually, we also want to handle degraded arrays here by
+ * trying to find and assign a spare.
+ * We do that whenever the monitor tells us too.
*/
// FIXME
a->info.array.raid_disks = mdstat->raid_disks;
a->info.array.chunk_size = mdstat->chunk_size;
// MORE
+ if (a->check_degraded) {
+ struct metadata_update *updates = NULL;
+ struct mdinfo *newdev = NULL;
+ struct active_array *newa;
+ struct mdinfo *d;
+
+ a->check_degraded = 0;
+
+ /* The array may not be degraded, this is just a good time
+ * to check.
+ */
+ newdev = a->container->ss->activate_spare(a, &updates);
+ if (!newdev)
+ return;
+
+ newa = duplicate_aa(a);
+ if (!newa)
+ goto out;
+ /* Cool, we can add a device or several. */
+
+ /* Add device to array and set offset/size/slot.
+ * and open files for each newdev */
+ for (d = newdev; d ; d = d->next) {
+ struct mdinfo *newd;
+
+ newd = malloc(sizeof(*newd));
+ if (!newd)
+ continue;
+ if (sysfs_add_disk(&newa->info, d, 0) < 0) {
+ free(newd);
+ continue;
+ }
+ *newd = *d;
+ newd->next = newa->info.devs;
+ newa->info.devs = newd;
+
+ newd->state_fd = sysfs_open(a->devnum, newd->sys_name,
+ "state");
+ newd->prev_state = read_dev_state(newd->state_fd);
+ newd->curr_state = newd->prev_state;
+ }
+ queue_metadata_update(updates);
+ updates = NULL;
+ replace_array(a->container, a, newa);
+ sysfs_set_str(&a->info, NULL, "sync_action", "recover");
+ out:
+ while (newdev) {
+ d = newdev->next;
+ free(newdev);
+ newdev = d;
+ }
+ free_updates(&updates);
+ }
+}
+
+static int aa_ready(struct active_array *aa)
+{
+ struct mdinfo *d;
+ int level = aa->info.array.level;
+
+ for (d = aa->info.devs; d; d = d->next)
+ if (d->state_fd < 0)
+ return 0;
+
+ if (aa->info.state_fd < 0)
+ return 0;
+
+ if (level > 0 && (aa->action_fd < 0 || aa->resync_start_fd < 0))
+ return 0;
+
+ if (!aa->container)
+ return 0;
+
+ return 1;
}
static void manage_new(struct mdstat_ent *mdstat,
struct active_array *new;
struct mdinfo *mdi, *di;
- char *n;
- int inst;
+ char *inst;
int i;
+ int failed = 0;
+
+ /* check if array is ready to be monitored */
+ if (!mdstat->active)
+ return;
+
+ mdi = sysfs_read(-1, mdstat->devnum,
+ GET_LEVEL|GET_CHUNK|GET_DISKS|GET_COMPONENT|
+ GET_DEGRADED|GET_DEVS|GET_OFFSET|GET_SIZE|GET_STATE);
new = malloc(sizeof(*new));
+ if (!new || !mdi) {
+ if (mdi)
+ sysfs_free(mdi);
+ if (new)
+ free(new);
+ return;
+ }
+ memset(new, 0, sizeof(*new));
+
new->devnum = mdstat->devnum;
+ strcpy(new->info.sys_name, devnum2devname(new->devnum));
new->prev_state = new->curr_state = new->next_state = inactive;
new->prev_action= new->curr_action= new->next_action= idle;
new->container = container;
- n = &mdstat->metadata_version[10+strlen(container->devname)+1];
- inst = atoi(n);
- if (inst < 0)
- abort();//FIXME
-
- mdi = sysfs_read(-1, new->devnum,
- GET_LEVEL|GET_CHUNK|GET_DISKS|
- GET_DEVS|GET_OFFSET|GET_SIZE|GET_STATE);
- if (!mdi) {
- /* Eeek. Cannot monitor this array.
- * Mark it to be ignored by setting container to NULL
- */
- new->container = NULL;
- replace_array(container, victim, new);
- return;
- }
+ inst = &mdstat->metadata_version[10+strlen(container->devname)+1];
new->info.array = mdi->array;
+ new->info.component_size = mdi->component_size;
for (i = 0; i < new->info.array.raid_disks; i++) {
struct mdinfo *newd = malloc(sizeof(*newd));
if (i == di->disk.raid_disk)
break;
- if (di) {
+ if (di && newd) {
memcpy(newd, di, sizeof(*newd));
- sprintf(newd->sys_name, "rd%d", i);
-
newd->state_fd = sysfs_open(new->devnum,
newd->sys_name,
"state");
+ newd->recovery_fd = sysfs_open(new->devnum,
+ newd->sys_name,
+ "recovery_start");
newd->prev_state = read_dev_state(newd->state_fd);
- newd->curr_state = newd->curr_state;
+ newd->curr_state = newd->prev_state;
} else {
- newd->state_fd = -1;
+ if (newd)
+ free(newd);
+
+ failed++;
+ if (failed > new->info.array.failed_disks) {
+ /* we cannot properly monitor without all working disks */
+ new->container = NULL;
+ break;
+ }
+ continue;
}
+ sprintf(newd->sys_name, "rd%d", i);
newd->next = new->info.devs;
new->info.devs = newd;
}
+
new->action_fd = sysfs_open(new->devnum, NULL, "sync_action");
new->info.state_fd = sysfs_open(new->devnum, NULL, "array_state");
new->resync_start_fd = sysfs_open(new->devnum, NULL, "resync_start");
- new->sync_pos_fd = sysfs_open(new->devnum, NULL, "sync_completed");
- new->sync_pos = 0;
+ new->metadata_fd = sysfs_open(new->devnum, NULL, "metadata_version");
+ dprintf("%s: inst: %d action: %d state: %d\n", __func__, atoi(inst),
+ new->action_fd, new->info.state_fd);
sysfs_free(mdi);
- // finds and compares.
- if (container->ss->open_new(container, new, inst) < 0) {
- // FIXME close all those files
+
+ /* if everything checks out tell the metadata handler we want to
+ * manage this instance
+ */
+ if (!aa_ready(new) || container->ss->open_new(container, new, inst) < 0) {
+ fprintf(stderr, "mdmon: failed to monitor %s\n",
+ mdstat->metadata_version);
new->container = NULL;
+ free_aa(new);
+ } else {
replace_array(container, victim, new);
- return;
+ if (failed) {
+ new->check_degraded = 1;
+ manage_member(mdstat, new);
+ }
}
- replace_array(container, victim, new);
- return;
}
-void manage(struct mdstat_ent *mdstat, struct active_array *aa,
- struct supertype *container)
+void manage(struct mdstat_ent *mdstat, struct supertype *container)
{
/* We have just read mdstat and need to compare it with
* the known active arrays.
manage_container(mdstat, container);
continue;
}
- if (mdstat->metadata_version == NULL ||
- strncmp(mdstat->metadata_version, "external:/", 10) != 0 ||
- strncmp(mdstat->metadata_version+10, container->devname,
- strlen(container->devname)) != 0 ||
- mdstat->metadata_version[10+strlen(container->devname)]
- != '/')
+ if (!is_container_member(mdstat, container->devname))
/* Not for this array */
continue;
/* Looks like a member of this container */
- for (a = aa; a; a = a->next) {
+ for (a = container->arrays; a; a = a->next) {
if (mdstat->devnum == a->devnum) {
if (a->container)
manage_member(mdstat, a);
}
}
-static int handle_message(struct supertype *container, struct md_message *msg)
+static void handle_message(struct supertype *container, struct metadata_update *msg)
{
- int err;
- struct md_generic_cmd *cmd = msg->buf;
+ /* queue this metadata update through to the monitor */
- if (!cmd)
- return 0;
-
- switch (cmd->action) {
- case md_action_remove_device:
+ struct metadata_update *mu;
- /* forward to the monitor */
- active_cmd = cmd;
- write(container->mgr_pipe[1], &err, 1);
- read(container->mon_pipe[0], &err, 1);
- return err;
+ if (msg->len <= 0)
+ while (update_queue_pending || update_queue) {
+ check_update_queue(container);
+ usleep(15*1000);
+ }
- default:
- return -1;
+ if (msg->len == 0) { /* ping_monitor */
+ int cnt;
+
+ cnt = monitor_loop_cnt;
+ if (cnt & 1)
+ cnt += 2; /* wait until next pselect */
+ else
+ cnt += 3; /* wait for 2 pselects */
+ wakeup_monitor();
+
+ while (monitor_loop_cnt - cnt < 0)
+ usleep(10 * 1000);
+ } else if (msg->len == -1) { /* ping_manager */
+ struct mdstat_ent *mdstat = mdstat_read(1, 0);
+
+ manage(mdstat, container);
+ free_mdstat(mdstat);
+ } else if (!sigterm) {
+ mu = malloc(sizeof(*mu));
+ mu->len = msg->len;
+ mu->buf = msg->buf;
+ msg->buf = NULL;
+ mu->space = NULL;
+ mu->next = NULL;
+ if (container->ss->prepare_update)
+ container->ss->prepare_update(container, mu);
+ queue_metadata_update(mu);
}
}
void read_sock(struct supertype *container)
{
int fd;
- struct md_message msg;
+ struct metadata_update msg;
int terminate = 0;
long fl;
int tmo = 3; /* 3 second timeout before hanging up the socket */
fcntl(fd, F_SETFL, fl);
do {
- int err;
-
msg.buf = NULL;
/* read and validate the message */
if (receive_message(fd, &msg, tmo) == 0) {
- err = handle_message(container, &msg);
- if (!err)
- ack(fd, msg.seq, tmo);
- else
- nack(fd, err, tmo);
- } else {
+ handle_message(container, &msg);
+ if (ack(fd, tmo) < 0)
+ terminate = 1;
+ } else
terminate = 1;
- nack(fd, -1, tmo);
- }
- if (msg.buf)
- free(msg.buf);
} while (!terminate);
close(fd);
}
+
+int exit_now = 0;
+int manager_ready = 0;
void do_manager(struct supertype *container)
{
struct mdstat_ent *mdstat;
+ sigset_t set;
+ int proc_fd;
+
+ sigprocmask(SIG_UNBLOCK, NULL, &set);
+ sigdelset(&set, SIGUSR1);
+ sigdelset(&set, SIGHUP);
+ sigdelset(&set, SIGALRM);
+ sigdelset(&set, SIGTERM);
+ proc_fd = open("/proc/mounts", O_RDONLY);
do {
- mdstat = mdstat_read(1, 0);
- manage(mdstat, array_list, container);
+ if (exit_now)
+ exit(0);
- read_sock(container);
+ /* Can only 'manage' things if 'monitor' is not making
+ * structural changes to metadata, so need to check
+ * update_queue
+ */
+ if (update_queue == NULL) {
+ mdstat = mdstat_read(1, 0);
+
+ manage(mdstat, container);
+
+ read_sock(container);
+
+ if (container->sock < 0 || socket_hup_requested) {
+ /* If this fails, we hope it already exists
+ * pid file lives in /var/run/mdadm/mdXX.pid
+ */
+ mkdir("/var", 0600);
+ mkdir("/var/run", 0600);
+ mkdir("/var/run/mdadm", 0600);
+ close(container->sock);
+ container->sock = make_control_sock(container->devname);
+ make_pidfile(container->devname, 0);
+ socket_hup_requested = 0;
+ }
+ if (container->sock < 0)
+ alarm(30);
- free_mdstat(mdstat);
+ free_mdstat(mdstat);
+ }
+ remove_old();
+
+ check_update_queue(container);
- mdstat_wait_fd(container->sock);
+ manager_ready = 1;
+
+ if (sigterm)
+ wakeup_monitor();
+
+ if (update_queue == NULL) {
+ if (container->sock < 0)
+ mdstat_wait_fd(proc_fd, &set);
+ else
+ mdstat_wait_fd(container->sock, &set);
+ } else
+ /* If an update is happening, just wait for signal */
+ pselect(0, NULL, NULL, NULL, NULL, &set);
} while(1);
}
projects / thirdparty / mdadm.git / blobdiff