btrfs: simplify sync/async submission in btrfs_submit_data_write_bio
btrfs_submit_data_write_bio special cases the reloc root because the checksums are preloaded, but only does so for the !sync case. The sync case can't happen for data relocation, but just handling it more generally significantly simplifies the logic. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Tested-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David Sterba <dsterba@suse.com>
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