Force flush changes to filesystem

[felipesere]

👋 Thank you for writing JFS!
I am using it as an alternative store for a side project.
While running my tests, I noticed that my delete case would sporadically fail.
It does a bunch of inserts, then a bunch of deletes and then reads to see if they still there.

I think adding a f.sync_all()? at the end of save_object_to_file should at least alleviate the case.

I can open a PR if you want.

[flosse]

Thanks for reporting!

I can open a PR if you want.

That would be awesome! 👍

[felipesere]

I added the alleged f.async_all() and it didn't really help. :(

My tests pass if I have a different file per running test. I am not 100% if Rust runs the tests concurrently?

[flosse]

@felipesere Could you add a testcase to reproduce the behavior?
I can't find a way to provoke this bug :(