I'll extend my tests and verify the workings of all available methods.

Where would you say is the right place to set the attributes on::format?

1. LittleFSImpl::format (LittleFS.h)
2. lfs_format (lfs.c)

The first would be most in line with the change in mklittlefs, I guess.

TheLittleFSImpl::format() would be the spot to add the attributes. We don't touch the upstream FS lib itself.

The _valid thing still sets off alarms. You're assuming that dirent is all 0'd (which it is, luckily, in the constructor...but only until something writes to it which can happen on rewind() or next() or other calls). Also, this would return the FS date no matter what the subdir it's in which is not what you're going for. Currently, also, if I read the sprintf logic you're doing a lfs_get_attr("") and not lfs_get_attr("/")

Thanks for the feedback and insights. I have updated the code to a more proper way to get the attributes. Also included is the proposed change to set the attributes on format.

LittleFS.creationTime()