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All functions that set up extent_page_data::tree set it to the inode
io_tree. That's passed down the callstack that accesses either the same
inode or its pages. In the end submit_extent_page can pull the tree out
of the page and we don't have to store it in the structure.
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>