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2a1ed20f0d
The op field always points to the same use_bitmap function, the only exception is during self tests where we make it temporarily point to a different function. So just because of this op pointer field we are increasing the structure size by 8 bytes. Instead of storing a pointer to a use_bitmap function in struct btrfs_free_space_ctl, move the pointer to struct btrfs_info, make insert_into_bitmap() use that pointer if we are running the self tests and initialize that pointer to the current, default use_bitmap function (now exported for the tests as btrfs_use_bitmap). This way we reduce the size of struct btrfs_free_space_ctl from 136 to 128 bytes and can now fit 32 structures in a 4K page instead of 30. This also avoids the cost of the indirection of a function pointer call when we are not running the self tests. Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>