btrfs: reserve correct number of items for rename
btrfs_rename() and btrfs_rename_exchange() don't account for enough items. Replace the incorrect explanations with a specific breakdown of the number of items and account them accurately. Note that this glosses over RENAME_WHITEOUT because the next commit is going to rework that, too. Reviewed-by: NSweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: NOmar Sandoval <osandov@fb.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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