md: allow upper limit for resync/reshape to be set when array is read-only
Normally we only allow the upper limit for a reshape to be decreased when the array not performing a sync/recovery/reshape, otherwise there could be races. But if an array is part-way through a reshape when it is assembled the reshape is started immediately leaving no window to set an upper bound. If the array is started read-only, the reshape will be suspended until the array becomes writable, so that provides a window during which it is perfectly safe to reduce the upper limit of a reshape. So: allow the upper limit (sync_max) to be reduced even if the reshape thread is running, as long as the array is still read-only. Signed-off-by: NeilBrown <neilb@suse.de>
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@ -3599,6 +3599,7 @@ max_sync_store(mddev_t *mddev, const char *buf, size_t len)
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if (max < mddev->resync_min)
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return -EINVAL;
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if (max < mddev->resync_max &&
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mddev->ro == 0 &&
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test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
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return -EBUSY;
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