md/raid0: update queue parameter in a safer location.
When a (e.g.) RAID5 array is reshaped to RAID0, the updating of queue parameters (e.g. max number of sectors per bio) is done in the wrong place. It should be part of ->run, but it is actually part of ->takeover. This means it happens before level_store() calls: blk_set_stacking_limits(&mddev->queue->limits); and so it ineffective. This can lead to errors from underlying devices. So move all the relevant settings out of create_stripe_zones() and into raid0_run(). As this can lead to a bug-on it is suitable for any -stable kernel which supports reshape to RAID0. So 2.6.35 or later. As the bug has been present for five years there is no urgency, so no need to rush into -stable. Fixes: 9af204cf ("md: Add support for Raid5->Raid0 and Raid10->Raid0 takeover") Cc: firstname.lastname@example.org (v2.6.35+ - please delay until after -final release). Reported-by: Yi Zhang <email@example.com> Signed-off-by: NeilBrown <firstname.lastname@example.org>
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