btrfs: Remove extent_io_ops::writepage_end_io_hook
This callback is ony ever called for data page writeout so there is no need to actually abstract it via extent_io_ops. Lets just export it, remove the definition of the callback and call it directly in the functions that invoke the callback. Also rename the function to btrfs_writepage_endio_finish_ordered since what it really does is account finished io in the ordered extent data structures. No functional changes. Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NNikolay Borisov <nborisov@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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