Possible filesystem layouts


Splitting metadata and data
Metadata could just live within the application binary
Data must definitely live on external storage
The application needs to host a copy anyways for initial setup
This should really be a structure, not a bunch of #define
And it must include version and magic number in the data.

TLV (type length and value)
All addresses are relatives
Subdirectories are easy to add (as a special type)
A writable file could be allocated to maximum-foreseen-size

Really, TLV is to be considered for a filesystem
The concept is well known and appreciated
The code size to access it is very small
The main disadvantage is that access is sequential