btrfs: move btrfs_get_block_group helper out of disk-io.h
This inline helper calls btrfs_fs_compat_ro(), which is defined in another header. To avoid weird header dependency problems move this helper into disk-io.c with the rest of the global root helpers. Reviewed-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: David Sterba <dsterba@suse.com>
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