FATfs on SPI flash or to use direct access to bloacks

[AShel.1]

Hello,

I've checked multiple threads on FATfs design for SPI flash. I see, there are some advantages of using FATfs like standard code, modularity etc. but are there any disadvantages apart from adding one more layer of execution between application and physical layer.

I want to reserve 2MB memory for code file(this is the section which will be used in boot loader code for firmware update) will it be possible if I use file system method.

Thanks,