btrfs: make subpage attach and detach handle metadata properly

btrfs: make subpage attach and detach handle metadata properly

Currently subpage attach/detach is not doing proper dummy extent buffer
subpage check, as btrfs_is_subpage() is not reliable for dummy extent
buffer folios.

Since we have a metadata specific check now, use that for
btrfs_attach_subpage() first.

Then enhance btrfs_detach_subpage() to accept a type parameter, so that
we can do extra checks for dummy extent buffers properly.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>