btrfs: remove embedded block_group_cache::item
The members ::used and ::flags are now in the block group cache structure, the last one is chunk_objectid, but that's set to a fixed value and otherwise unused. The item is constructed from a local variable before write, so we can remove the embedded one from block group. Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Reviewed-by: NNikolay Borisov <nborisov@suse.com> Reviewed-by: NQu Wenruo <wqu@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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