btrfs: use btrfs_read_node_slot in btrfs_realloc_node
We have this open-coded nightmare in btrfs_realloc_node that does the same thing that the normal read path does, which is to see if we have the eb in memory already, and if not read it, and verify the eb is uptodate. Delete this open coding and simply use btrfs_read_node_slot. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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