btrfs: raid56: switch write path to rmw_rbio()
This includes the following changes: - Implement new raid_unplug() functions Now we don't need a workqueue to run the plug, as all our work is just queue rmw_rbio_work() call, which can be executed without sleep. - Implement a rmw_rbio_work_locked() helper This is for unlock_stripe(), which is already holding the full stripe lock. - Remove all the old functions This should already shows how complex the old functions are, as we ended up removing the following functions: * rmw_work() * validate_rbio_for_rmw() * raid56_rmw_end_io_work() * raid56_rmw_stripe() * full_stripe_write() * partial_stripe_write() * __raid56_parity_write() * run_plug() * unplug_work() * btrfs_raid_unplug() * rmw_work() * __raid56_parity_recover() * raid_recover_end_io_work() - Unexport rmw_rbio() Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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