How to coexist Fatfs with low level Nand flash reading and writing in UC-OSiii?

[mcen]

I'm using STM32F415VG, on which we built uc-osIII, I've built a Fatfs on nand flash, unfortunately, we had to use a block at the end of low-level nand flash read and write. How can I change the size of Fatfs and realize that this low-level function coexists with the file system at the same time, can I realize it?

[Tesla DeLorean]

The large erase block size of NAND memories is ill-suited to MCU with limited RAM resources.

Do you have to use FatFS? Could you use something more incremental / journalling ?