But, one potential issue here is that your FPGA now needs to modify the filesystem to write any new results.
Maybe the use-case here is more like transforming the data on the fly. Let's say storing the data compressed, but reading it back uncompressed. This could effectively be transparent to the host CPU, but handled by the FPGA.
The more that I think about it, this data flow sounds significantly more reasonable than asynchronously processing data. Then you could still read / transform / write the new data to the SSD, but you'd limit the main CPU to only sending the read/write IO, instead of the transparent transformation.
Maybe the use-case here is more like transforming the data on the fly. Let's say storing the data compressed, but reading it back uncompressed. This could effectively be transparent to the host CPU, but handled by the FPGA.
The more that I think about it, this data flow sounds significantly more reasonable than asynchronously processing data. Then you could still read / transform / write the new data to the SSD, but you'd limit the main CPU to only sending the read/write IO, instead of the transparent transformation.