]>
git.ipfire.org Git - thirdparty/mdadm.git/blob - managemon.c
2 * mdmon - monitor external metadata arrays
4 * Copyright (C) 2007-2009 Neil Brown <neilb@suse.de>
5 * Copyright (C) 2007-2009 Intel Corporation
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2, as published by the Free Software Foundation.
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
22 * The management thread for monitoring active md arrays.
23 * This thread does things which might block such as memory
27 * - Find out about new arrays in this container.
28 * Allocate the data structures and open the files.
30 * For this we watch /proc/mdstat and find new arrays with
31 * metadata type that confirms sharing. e.g. "md4"
32 * When we find a new array we slip it into the list of
33 * arrays and signal 'monitor' by writing to a pipe.
35 * - Respond to reshape requests by allocating new data structures
36 * and opening new files.
38 * These come as a change to raid_disks. We allocate a new
39 * version of the data structures and slip it into the list.
40 * 'monitor' will notice and release the old version.
41 * Changes to level, chunksize, layout.. do not need re-allocation.
42 * Reductions in raid_disks don't really either, but we handle
43 * them the same way for consistency.
45 * - When a device is added to the container, we add it to the metadata
48 * - Deal with degraded array
49 * We only do this when first noticing the array is degraded.
50 * This can be when we first see the array, when sync completes or
51 * when recovery completes.
53 * Check if number of failed devices suggests recovery is needed, and
55 * Ask metadata to allocate a spare device
56 * Add device as not in_sync and give a role
58 * Open sysfs files and pass to monitor.
59 * Make sure that monitor Starts recovery....
61 * - Pass on metadata updates from external programs such as
62 * mdadm creating a new array.
65 * It might involve adding a new array or changing the status of
66 * a spare, or any reconfig that the kernel doesn't get involved in.
68 * The required updates are received via a named pipe. There will
69 * be one named pipe for each container. Each message contains a
70 * sync marker: 0x5a5aa5a5, A byte count, and the message. This is
71 * passed to the metadata handler which will interpret and process it.
72 * For 'DDF' messages are internal data blocks with the leading
73 * 'magic number' signifying what sort of data it is.
78 * We select on /proc/mdstat and the named pipe.
79 * We create new arrays or updated version of arrays and slip
80 * them into the head of the list, then signal 'monitor' via a pipe write.
81 * 'monitor' will notice and place the old array on a return list.
82 * Metadata updates are placed on a queue just like they arrive
83 * from the named pipe.
85 * When new arrays are found based on correct metadata string, we
86 * need to identify them with an entry in the metadata. Maybe we require
87 * the metadata to be mdX/NN when NN is the index into an appropriate table.
93 * - Watch for spares to be added to the container, and write updated
95 * - Watch for new arrays using this container, confirm they match metadata
96 * and if so, start monitoring them
97 * - Watch for spares being added to monitored arrays. This shouldn't
98 * happen, as we should do all the adding. Just remove them.
99 * - Watch for change in raid-disks, chunk-size, etc. Update metadata and
107 #include <sys/syscall.h>
108 #include <sys/socket.h>
111 static void close_aa(struct active_array
*aa
)
115 for (d
= aa
->info
.devs
; d
; d
= d
->next
) {
116 close(d
->recovery_fd
);
122 if (aa
->action_fd
>= 0)
123 close(aa
->action_fd
);
124 if (aa
->info
.state_fd
>= 0)
125 close(aa
->info
.state_fd
);
126 if (aa
->resync_start_fd
>= 0)
127 close(aa
->resync_start_fd
);
128 if (aa
->metadata_fd
>= 0)
129 close(aa
->metadata_fd
);
130 if (aa
->sync_completed_fd
>= 0)
131 close(aa
->sync_completed_fd
);
134 static void free_aa(struct active_array
*aa
)
136 /* Note that this doesn't close fds if they are being used
137 * by a clone. ->container will be set for a clone
139 dprintf("sys_name: %s\n", aa
->info
.sys_name
);
142 while (aa
->info
.devs
) {
143 struct mdinfo
*d
= aa
->info
.devs
;
144 aa
->info
.devs
= d
->next
;
150 static struct active_array
*duplicate_aa(struct active_array
*aa
)
152 struct active_array
*newa
= xmalloc(sizeof(*newa
));
153 struct mdinfo
**dp1
, **dp2
;
157 newa
->replaces
= NULL
;
158 newa
->info
.next
= NULL
;
160 dp2
= &newa
->info
.devs
;
162 for (dp1
= &aa
->info
.devs
; *dp1
; dp1
= &(*dp1
)->next
) {
164 if ((*dp1
)->state_fd
< 0)
167 d
= xmalloc(sizeof(*d
));
177 static void wakeup_monitor(void)
179 /* tgkill(getpid(), mon_tid, SIGUSR1); */
181 syscall(SYS_tgkill
, pid
, mon_tid
, SIGUSR1
);
184 static void remove_old(void)
187 discard_this
->next
= NULL
;
188 free_aa(discard_this
);
189 if (pending_discard
== discard_this
)
190 pending_discard
= NULL
;
196 static void replace_array(struct supertype
*container
,
197 struct active_array
*old
,
198 struct active_array
*new)
200 /* To replace an array, we add it to the top of the list
201 * marked with ->replaces to point to the original.
202 * 'monitor' will take the original out of the list
203 * and put it on 'discard_this'. We take it from there
207 while (pending_discard
) {
208 while (discard_this
== NULL
)
212 pending_discard
= old
;
214 new->next
= container
->arrays
;
215 container
->arrays
= new;
219 struct metadata_update
*update_queue
= NULL
;
220 struct metadata_update
*update_queue_handled
= NULL
;
221 struct metadata_update
*update_queue_pending
= NULL
;
223 static void free_updates(struct metadata_update
**update
)
226 struct metadata_update
*this = *update
;
227 void **space_list
= this->space_list
;
229 *update
= this->next
;
233 void *space
= space_list
;
234 space_list
= *space_list
;
241 void check_update_queue(struct supertype
*container
)
243 free_updates(&update_queue_handled
);
245 if (update_queue
== NULL
&&
246 update_queue_pending
) {
247 update_queue
= update_queue_pending
;
248 update_queue_pending
= NULL
;
253 static void queue_metadata_update(struct metadata_update
*mu
)
255 struct metadata_update
**qp
;
257 qp
= &update_queue_pending
;
259 qp
= & ((*qp
)->next
);
263 static void add_disk_to_container(struct supertype
*st
, struct mdinfo
*sd
)
267 struct supertype
*st2
;
268 struct metadata_update
*update
= NULL
;
270 mdu_disk_info_t dk
= {
272 .major
= sd
->disk
.major
,
273 .minor
= sd
->disk
.minor
,
278 dprintf("add %d:%d to container\n", sd
->disk
.major
, sd
->disk
.minor
);
283 sprintf(nm
, "%d:%d", sd
->disk
.major
, sd
->disk
.minor
);
284 dfd
= dev_open(nm
, O_RDWR
);
288 /* Check the metadata and see if it is already part of this
292 if (st2
->ss
->load_super(st2
, dfd
, NULL
) == 0) {
293 st2
->ss
->getinfo_super(st2
, &info
, NULL
);
294 if (st
->ss
->compare_super(st
, st2
) == 0 &&
295 info
.disk
.raid_disk
>= 0) {
296 /* Looks like a good member of array.
298 * mdadm will incorporate any parts into
301 st2
->ss
->free_super(st2
);
305 st2
->ss
->free_super(st2
);
307 st
->update_tail
= &update
;
308 st
->ss
->add_to_super(st
, &dk
, dfd
, NULL
, INVALID_SECTORS
);
309 st
->ss
->write_init_super(st
);
310 queue_metadata_update(update
);
311 st
->update_tail
= NULL
;
315 * Create and queue update structure about the removed disks.
316 * The update is prepared by super type handler and passed to the monitor
319 static void remove_disk_from_container(struct supertype
*st
, struct mdinfo
*sd
)
321 struct metadata_update
*update
= NULL
;
322 mdu_disk_info_t dk
= {
324 .major
= sd
->disk
.major
,
325 .minor
= sd
->disk
.minor
,
329 dprintf("remove %d:%d from container\n",
330 sd
->disk
.major
, sd
->disk
.minor
);
332 st
->update_tail
= &update
;
333 st
->ss
->remove_from_super(st
, &dk
);
334 /* FIXME this write_init_super shouldn't be here.
335 * We have it after add_to_super to write to new device,
336 * but with 'remove' we don't ant to write to that device!
338 st
->ss
->write_init_super(st
);
339 queue_metadata_update(update
);
340 st
->update_tail
= NULL
;
343 static void manage_container(struct mdstat_ent
*mdstat
,
344 struct supertype
*container
)
346 /* Of interest here are:
347 * - if a new device has been added to the container, we
348 * add it to the array ignoring any metadata on it.
349 * - if a device has been removed from the container, we
350 * remove it from the device list and update the metadata.
351 * FIXME should we look for compatible metadata and take hints
352 * about spare assignment.... probably not.
354 if (mdstat
->devcnt
!= container
->devcnt
) {
355 struct mdinfo
**cdp
, *cd
, *di
, *mdi
;
358 /* read /sys/block/NAME/md/dev-??/block/dev to find out
359 * what is there, and compare with container->info.devs
360 * To see what is removed and what is added.
361 * These need to be remove from, or added to, the array
363 mdi
= sysfs_read(-1, mdstat
->devnm
, GET_DEVS
);
365 /* invalidate the current count so we can try again */
366 container
->devcnt
= -1;
370 /* check for removals */
371 for (cdp
= &container
->devs
; *cdp
; ) {
373 for (di
= mdi
->devs
; di
; di
= di
->next
)
374 if (di
->disk
.major
== (*cdp
)->disk
.major
&&
375 di
->disk
.minor
== (*cdp
)->disk
.minor
) {
382 remove_disk_from_container(container
, cd
);
388 /* check for additions */
389 for (di
= mdi
->devs
; di
; di
= di
->next
) {
390 for (cd
= container
->devs
; cd
; cd
= cd
->next
)
391 if (di
->disk
.major
== cd
->disk
.major
&&
392 di
->disk
.minor
== cd
->disk
.minor
)
395 struct mdinfo
*newd
= xmalloc(sizeof(*newd
));
398 add_disk_to_container(container
, newd
);
402 container
->devcnt
= mdstat
->devcnt
;
406 static int sysfs_open2(char *devnum
, char *name
, char *attr
)
408 int fd
= sysfs_open(devnum
, name
, attr
);
410 /* seq_file in the kernel allocates buffer space
411 * on the first read. Do that now so 'monitor'
415 if (read(fd
, buf
, sizeof(buf
)) < 0)
416 /* pretend not to ignore return value */
422 static int disk_init_and_add(struct mdinfo
*disk
, struct mdinfo
*clone
,
423 struct active_array
*aa
)
429 disk
->recovery_fd
= sysfs_open2(aa
->info
.sys_name
, disk
->sys_name
,
431 if (disk
->recovery_fd
< 0)
433 disk
->state_fd
= sysfs_open2(aa
->info
.sys_name
, disk
->sys_name
, "state");
434 if (disk
->state_fd
< 0) {
435 close(disk
->recovery_fd
);
438 disk
->bb_fd
= sysfs_open2(aa
->info
.sys_name
, disk
->sys_name
,
440 if (disk
->bb_fd
< 0) {
441 close(disk
->recovery_fd
);
442 close(disk
->state_fd
);
445 disk
->ubb_fd
= sysfs_open2(aa
->info
.sys_name
, disk
->sys_name
,
446 "unacknowledged_bad_blocks");
447 if (disk
->ubb_fd
< 0) {
448 close(disk
->recovery_fd
);
449 close(disk
->state_fd
);
453 disk
->prev_state
= read_dev_state(disk
->state_fd
);
454 disk
->curr_state
= disk
->prev_state
;
455 disk
->next
= aa
->info
.devs
;
456 aa
->info
.devs
= disk
;
461 static void manage_member(struct mdstat_ent
*mdstat
,
462 struct active_array
*a
)
464 /* Compare mdstat info with known state of member array.
465 * We do not need to look for device state changes here, that
466 * is dealt with by the monitor.
468 * If a reshape is being requested, monitor will have noticed
469 * that sync_action changed and will have set check_reshape.
470 * We just need to see if new devices have appeared. All metadata
471 * updates will already have been processed.
473 * We also want to handle degraded arrays here by
474 * trying to find and assign a spare.
475 * We do that whenever the monitor tells us too.
479 struct supertype
*container
= a
->container
;
482 if (container
== NULL
)
483 /* Raced with something */
486 if (mdstat
->active
) {
488 a
->info
.array
.raid_disks
= mdstat
->raid_disks
;
492 mdi
= sysfs_read(-1, mdstat
->devnm
,
493 GET_COMPONENT
|GET_CONSISTENCY_POLICY
);
495 a
->info
.component_size
= mdi
->component_size
;
496 a
->info
.consistency_policy
= mdi
->consistency_policy
;
501 if (sysfs_get_str(&a
->info
, NULL
, "metadata_version", buf
, sizeof(buf
)) > 0)
502 frozen
= buf
[9] == '-';
504 frozen
= 1; /* can't read metadata_version assume the worst */
506 /* If sync_action is not 'idle' then don't try recovery now */
508 sysfs_get_str(&a
->info
, NULL
, "sync_action",
509 buf
, sizeof(buf
)) > 0 && strncmp(buf
, "idle", 4) != 0)
513 int level
= map_name(pers
, mdstat
->level
);
514 if (level
== 0 || level
== LEVEL_LINEAR
) {
519 else if (a
->info
.array
.level
!= level
&& level
> 0) {
520 struct active_array
*newa
= duplicate_aa(a
);
522 newa
->info
.array
.level
= level
;
523 replace_array(container
, a
, newa
);
529 /* we are after monitor kick,
530 * so container field can be cleared - check it again
532 if (a
->container
== NULL
)
535 if (sigterm
&& a
->info
.safe_mode_delay
!= 1) {
536 sysfs_set_safemode(&a
->info
, 1);
537 a
->info
.safe_mode_delay
= 1;
540 /* We don't check the array while any update is pending, as it
541 * might container a change (such as a spare assignment) which
542 * could affect our decisions.
544 if (a
->check_degraded
&& !frozen
&&
545 update_queue
== NULL
&& update_queue_pending
== NULL
) {
546 struct metadata_update
*updates
= NULL
;
547 struct mdinfo
*newdev
= NULL
;
548 struct active_array
*newa
;
551 a
->check_degraded
= 0;
553 /* The array may not be degraded, this is just a good time
556 newdev
= container
->ss
->activate_spare(a
, &updates
);
560 newa
= duplicate_aa(a
);
563 /* prevent the kernel from activating the disk(s) before we
566 dprintf("freezing %s\n", a
->info
.sys_name
);
567 sysfs_set_str(&a
->info
, NULL
, "sync_action", "frozen");
569 /* Add device to array and set offset/size/slot.
570 * and open files for each newdev */
571 for (d
= newdev
; d
; d
= d
->next
) {
574 newd
= xmalloc(sizeof(*newd
));
575 if (sysfs_add_disk(&newa
->info
, d
, 0) < 0) {
579 disk_init_and_add(newd
, d
, newa
);
581 queue_metadata_update(updates
);
583 while (update_queue_pending
|| update_queue
) {
584 check_update_queue(container
);
587 replace_array(container
, a
, newa
);
588 if (sysfs_set_str(&a
->info
, NULL
,
589 "sync_action", "recover") == 0)
590 newa
->prev_action
= recover
;
591 dprintf("recovery started on %s\n", a
->info
.sys_name
);
598 free_updates(&updates
);
601 if (a
->check_reshape
) {
602 /* mdadm might have added some devices to the array.
603 * We want to disk_init_and_add any such device to a
604 * duplicate_aa and replace a with that.
605 * mdstat doesn't have enough info so we sysfs_read
606 * and look for new stuff.
608 struct mdinfo
*info
, *d
, *d2
, *newd
;
609 unsigned long long array_size
;
610 struct active_array
*newa
= NULL
;
611 a
->check_reshape
= 0;
612 info
= sysfs_read(-1, mdstat
->devnm
,
613 GET_DEVS
|GET_OFFSET
|GET_SIZE
|GET_STATE
);
616 for (d
= info
->devs
; d
; d
= d
->next
) {
617 if (d
->disk
.raid_disk
< 0)
619 for (d2
= a
->info
.devs
; d2
; d2
= d2
->next
)
620 if (d2
->disk
.raid_disk
==
624 /* already have this one */
627 newa
= duplicate_aa(a
);
631 newd
= xmalloc(sizeof(*newd
));
632 disk_init_and_add(newd
, d
, newa
);
634 if (sysfs_get_ll(info
, NULL
, "array_size", &array_size
) == 0 &&
635 a
->info
.custom_array_size
> array_size
*2) {
636 sysfs_set_num(info
, NULL
, "array_size",
637 a
->info
.custom_array_size
/2);
642 replace_array(container
, a
, newa
);
646 static int aa_ready(struct active_array
*aa
)
649 int level
= aa
->info
.array
.level
;
651 for (d
= aa
->info
.devs
; d
; d
= d
->next
)
655 if (aa
->info
.state_fd
< 0)
658 if (level
> 0 && (aa
->action_fd
< 0 || aa
->resync_start_fd
< 0))
667 static void manage_new(struct mdstat_ent
*mdstat
,
668 struct supertype
*container
,
669 struct active_array
*victim
)
671 /* A new array has appeared in this container.
672 * Hopefully it is already recorded in the metadata.
673 * Check, then create the new array to report it to
677 struct active_array
*new;
678 struct mdinfo
*mdi
, *di
;
684 /* check if array is ready to be monitored */
685 if (!mdstat
->active
|| !mdstat
->level
)
687 if (strcmp(mdstat
->level
, "raid0") == 0 ||
688 strcmp(mdstat
->level
, "linear") == 0)
691 mdi
= sysfs_read(-1, mdstat
->devnm
,
692 GET_LEVEL
|GET_CHUNK
|GET_DISKS
|GET_COMPONENT
|
693 GET_SAFEMODE
|GET_DEVS
|GET_OFFSET
|GET_SIZE
|GET_STATE
|
698 new = xcalloc(1, sizeof(*new));
700 strcpy(new->info
.sys_name
, mdstat
->devnm
);
702 new->prev_state
= new->curr_state
= new->next_state
= inactive
;
703 new->prev_action
= new->curr_action
= new->next_action
= idle
;
705 new->container
= container
;
707 inst
= to_subarray(mdstat
, container
->devnm
);
709 new->info
.array
= mdi
->array
;
710 new->info
.component_size
= mdi
->component_size
;
712 for (i
= 0; i
< new->info
.array
.raid_disks
; i
++) {
713 struct mdinfo
*newd
= xmalloc(sizeof(*newd
));
715 for (di
= mdi
->devs
; di
; di
= di
->next
)
716 if (i
== di
->disk
.raid_disk
)
719 if (disk_init_and_add(newd
, di
, new) != 0) {
724 if (failed
> new->info
.array
.failed_disks
) {
725 /* we cannot properly monitor without all working disks */
726 new->container
= NULL
;
732 new->action_fd
= sysfs_open2(new->info
.sys_name
, NULL
, "sync_action");
733 new->info
.state_fd
= sysfs_open2(new->info
.sys_name
, NULL
, "array_state");
734 new->resync_start_fd
= sysfs_open2(new->info
.sys_name
, NULL
, "resync_start");
735 new->metadata_fd
= sysfs_open2(new->info
.sys_name
, NULL
, "metadata_version");
736 new->sync_completed_fd
= sysfs_open2(new->info
.sys_name
, NULL
, "sync_completed");
738 dprintf("inst: %s action: %d state: %d\n", inst
,
739 new->action_fd
, new->info
.state_fd
);
742 new->info
.safe_mode_delay
= 1;
743 else if (mdi
->safe_mode_delay
>= 50)
744 /* Normal start, mdadm set this. */
745 new->info
.safe_mode_delay
= mdi
->safe_mode_delay
;
747 /* Restart, just pick a number */
748 new->info
.safe_mode_delay
= 5000;
749 sysfs_set_safemode(&new->info
, new->info
.safe_mode_delay
);
751 /* reshape_position is set by mdadm in sysfs
752 * read this information for new arrays only (empty victim)
754 if ((victim
== NULL
) &&
755 (sysfs_get_str(mdi
, NULL
, "sync_action", buf
, 40) > 0) &&
756 (strncmp(buf
, "reshape", 7) == 0)) {
757 if (sysfs_get_ll(mdi
, NULL
, "reshape_position",
758 &new->last_checkpoint
) != 0)
759 new->last_checkpoint
= 0;
761 int data_disks
= mdi
->array
.raid_disks
;
762 if (mdi
->array
.level
== 4 || mdi
->array
.level
== 5)
764 if (mdi
->array
.level
== 6)
767 new->last_checkpoint
/= data_disks
;
769 dprintf("mdmon: New monitored array is under reshape.\n"
770 " Last checkpoint is: %llu\n",
771 new->last_checkpoint
);
776 /* if everything checks out tell the metadata handler we want to
777 * manage this instance
779 if (!aa_ready(new) || container
->ss
->open_new(container
, new, inst
) < 0) {
780 pr_err("failed to monitor %s\n",
781 mdstat
->metadata_version
);
782 new->container
= NULL
;
785 replace_array(container
, victim
, new);
787 new->check_degraded
= 1;
788 manage_member(mdstat
, new);
793 void manage(struct mdstat_ent
*mdstat
, struct supertype
*container
)
795 /* We have just read mdstat and need to compare it with
796 * the known active arrays.
797 * Arrays with the wrong metadata are ignored.
800 for ( ; mdstat
; mdstat
= mdstat
->next
) {
801 struct active_array
*a
;
802 if (strcmp(mdstat
->devnm
, container
->devnm
) == 0) {
803 manage_container(mdstat
, container
);
806 if (!is_container_member(mdstat
, container
->devnm
))
807 /* Not for this array */
809 /* Looks like a member of this container */
810 for (a
= container
->arrays
; a
; a
= a
->next
) {
811 if (strcmp(mdstat
->devnm
, a
->info
.sys_name
) == 0) {
812 if (a
->container
&& a
->to_remove
== 0)
813 manage_member(mdstat
, a
);
817 if (a
== NULL
|| !a
->container
)
818 manage_new(mdstat
, container
, a
);
822 static void handle_message(struct supertype
*container
, struct metadata_update
*msg
)
824 /* queue this metadata update through to the monitor */
826 struct metadata_update
*mu
;
829 while (update_queue_pending
|| update_queue
) {
830 check_update_queue(container
);
834 if (msg
->len
== 0) { /* ping_monitor */
837 cnt
= monitor_loop_cnt
;
839 cnt
+= 2; /* wait until next pselect */
841 cnt
+= 3; /* wait for 2 pselects */
844 while (monitor_loop_cnt
- cnt
< 0)
846 } else if (msg
->len
== -1) { /* ping_manager */
847 struct mdstat_ent
*mdstat
= mdstat_read(1, 0);
849 manage(mdstat
, container
);
851 } else if (!sigterm
) {
852 mu
= xmalloc(sizeof(*mu
));
857 mu
->space_list
= NULL
;
859 if (container
->ss
->prepare_update
)
860 if (!container
->ss
->prepare_update(container
, mu
))
862 queue_metadata_update(mu
);
866 void read_sock(struct supertype
*container
)
869 struct metadata_update msg
;
872 int tmo
= 3; /* 3 second timeout before hanging up the socket */
874 fd
= accept(container
->sock
, NULL
, NULL
);
878 fl
= fcntl(fd
, F_GETFL
, 0);
880 fcntl(fd
, F_SETFL
, fl
);
885 /* read and validate the message */
886 if (receive_message(fd
, &msg
, tmo
) == 0) {
887 handle_message(container
, &msg
);
889 /* ping reply with version */
891 msg
.len
= strlen(Version
) + 1;
892 if (send_message(fd
, &msg
, tmo
) < 0)
894 } else if (ack(fd
, tmo
) < 0)
899 } while (!terminate
);
905 int manager_ready
= 0;
906 void do_manager(struct supertype
*container
)
908 struct mdstat_ent
*mdstat
;
911 sigprocmask(SIG_UNBLOCK
, NULL
, &set
);
912 sigdelset(&set
, SIGUSR1
);
913 sigdelset(&set
, SIGTERM
);
920 /* Can only 'manage' things if 'monitor' is not making
921 * structural changes to metadata, so need to check
924 if (update_queue
== NULL
) {
925 mdstat
= mdstat_read(1, 0);
927 manage(mdstat
, container
);
929 read_sock(container
);
935 check_update_queue(container
);
942 if (update_queue
== NULL
)
943 mdstat_wait_fd(container
->sock
, &set
);
945 /* If an update is happening, just wait for signal */
946 pselect(0, NULL
, NULL
, NULL
, NULL
, &set
);