log FS backend should provide ways of reading and deleting content.

[Martdur]

As it is now the log backend fs allows to write the log into a file and overwrite it.
But it doesn't provide all function from little fs.

This is not very convenient if you want to do some operation on the log file from the application at run-time.

It would be nice to have some kind of basic function like delete_content or read accessible from the app.

Right now a way to do it is by create your own struct fs_file_t with the right path and then you can read it's content.
But since this struct is not linked with the one in log_back_end.c , you can not truncate nor delete the file.

I don't have the solution yet but some ideas :

• Create a reset function in the log_backend API that allow to delete the content of the log_backend_fs
• Use the void* ctx pointer to give access to the struct fs_file_t of the log_backend_fs.c file.
• Create another log_backend_fs driver that need to be instanciate with a struct fs_file_t* at initialisation.

All of those 3 have major drawbacks and I haven't find a elegant solution yet.