btrfs: use cached_state for btrfs_check_nocow_lock
Now that try_lock_extent() takes a cached_state, plumb the cached_state through btrfs_try_lock_ordered_range() and then use a cached_state in btrfs_check_nocow_lock everywhere to avoid extra tree searches on the extent_io_tree. Reviewed-by: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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