When are file attributes finally written to "disk"?

[RalfEsy]

When using lfs_setattr() it seems the attribute data are not immediately written to "disk" (the corresponding file was not open).

During the call of lfs_setattr() there was no call to the "program" function (lfs_config::prog) and after a restart of the system the file attribute is not available.

I wonder how I can enforce littlefs to perform the write to "disk"?

[RalfEsy]

I'm not sure if this is an issue on my side - I'll have to investigate this further...

[geky]

During the call of lfs_setattr() there was no call to the "program" function

This certainly shouldn't happen. Progs in littlefs may be cached sometimes, but not when metadata changes are involved. lfs_setattr is a small wrapper over lfs_dir_commit, which flushes and syncs the new metadata to disk.