Btrfs: remove old tree_root case in btrfs_read_locked_inode()
As Jeff explained in c2951f32 ("btrfs: remove old tree_root dirent processing in btrfs_real_readdir()"), supporting this old format is no longer necessary since the Btrfs magic number has been updated since we changed to the current format. There are other places where we still handle this old format, but since this is part of a fix that is going to stable, I'm only removing this one for now. Cc: <stable@vger.kernel.org> # 4.9.x Signed-off-by: NOmar Sandoval <osandov@fb.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NChris Mason <clm@fb.com>
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