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md: sync sync_completed has correct value as recovery finishes.

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There can be a small window between the moment that recovery
actually writes the last block and the time when various sysfs
and /proc/mdstat attributes report that it has finished.
During this time, 'sync_completed' can have the wrong value.
This can confuse monitoring software.

So:
 - don't set curr_resync_completed beyond the end of the devices,
 - set it correctly when resync/recovery has completed.

Signed-off-by: NeilBrown <neilb@suse.com>
This commit is contained in:
NeilBrown 2015-07-24 13:27:08 +10:00
parent c5e19d906a
commit 5ed1df2eac
1 changed files with 9 additions and 0 deletions
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9
drivers/md/md.c
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@ -7880,6 +7880,9 @@ void md_do_sync(struct md_thread *thread)
break;
j += sectors;
if (j > max_sectors)
/* when skipping, extra large numbers can be returned. */
j = max_sectors;
if (j > 2)
mddev->curr_resync = j;
if (mddev_is_clustered(mddev))
@ -7948,6 +7951,12 @@ void md_do_sync(struct md_thread *thread)
blk_finish_plug(&plug);
wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
mddev->curr_resync > 2) {
mddev->curr_resync_completed = mddev->curr_resync;
sysfs_notify(&mddev->kobj, NULL, "sync_completed");
}
/* tell personality that we are finished */
mddev->pers->sync_request(mddev, max_sectors, &skipped);