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md: improve usefulness and accuracy of sysfs file md/sync_completed.

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The sync_completed file reports how much of a resync (or recovery or
reshape) has been completed.
However due to the possibility of out-of-order completion of writes,
it is not certain to be accurate.

We have an internal value - mddev->curr_resync_completed - which is an
accurate value (though it might not always be quite so uptodate).

So:
 - make curr_resync_completed be uptodate a little more often,
   particularly when raid5 reshape updates status in the metadata
 - report curr_resync_completed in the sysfs file
 - allow poll/select to report all updates to md/sync_completed.

This makes sync_completed completed usable by any external metadata
handler that wants to record this status information in its metadata.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown
2009-04-14 16:28:34 +10:00
parent 6d56e27844
commit acb180b0e3
3 changed files with 27 additions and 12 deletions
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34
drivers/md/md.c
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@@ -2017,6 +2017,8 @@ repeat:
clear_bit(MD_CHANGE_PENDING, &mddev->flags);
spin_unlock_irq(&mddev->write_lock);
wake_up(&mddev->sb_wait);
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
sysfs_notify(&mddev->kobj, NULL, "sync_completed");
}
@@ -3486,12 +3488,15 @@ sync_completed_show(mddev_t *mddev, char *page)
{
unsigned long max_sectors, resync;
if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
return sprintf(page, "none\n");
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
max_sectors = mddev->resync_max_sectors;
else
max_sectors = mddev->dev_sectors;
resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
resync = mddev->curr_resync_completed;
return sprintf(page, "%lu / %lu\n", resync, max_sectors);
}
@@ -6338,18 +6343,12 @@ void md_do_sync(mddev_t *mddev)
sector_t sectors;
skipped = 0;
if (j >= mddev->resync_max) {
sysfs_notify(&mddev->kobj, NULL, "sync_completed");
wait_event(mddev->recovery_wait,
mddev->resync_max > j
|| kthread_should_stop());
}
if (kthread_should_stop())
goto interrupted;
if (mddev->curr_resync > mddev->curr_resync_completed &&
(mddev->curr_resync - mddev->curr_resync_completed)
> (max_sectors >> 4)) {
if ((mddev->curr_resync > mddev->curr_resync_completed &&
(mddev->curr_resync - mddev->curr_resync_completed)
> (max_sectors >> 4)) ||
j >= mddev->resync_max
) {
/* time to update curr_resync_completed */
blk_unplug(mddev->queue);
wait_event(mddev->recovery_wait,
@@ -6357,7 +6356,17 @@ void md_do_sync(mddev_t *mddev)
mddev->curr_resync_completed =
mddev->curr_resync;
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
sysfs_notify(&mddev->kobj, NULL, "sync_completed");
}
if (j >= mddev->resync_max)
wait_event(mddev->recovery_wait,
mddev->resync_max > j
|| kthread_should_stop());
if (kthread_should_stop())
goto interrupted;
sectors = mddev->pers->sync_request(mddev, j, &skipped,
currspeed < speed_min(mddev));
if (sectors == 0) {
@@ -6465,6 +6474,7 @@ void md_do_sync(mddev_t *mddev)
skip:
mddev->curr_resync = 0;
mddev->curr_resync_completed = 0;
mddev->resync_min = 0;
mddev->resync_max = MaxSector;
sysfs_notify(&mddev->kobj, NULL, "sync_completed");