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We may also just want to bring the SynClient or do something directly with libcephfs to grab exact sequences instead of going through the ceph-fuse asok.

Do we need an asok interface for this? If you're planning to write testcases that link in libcephfs directly, then you can just add new libcephfs calls that do what you want, and write testcases that just call them.

The main reason to add something like asok interface would be if you want to be able to issue these sorts of requests in conjunction with (e.g.) a FUSE mount or ganesha export. Are you planning to do that?

Jeff Layton wrote:

Do we need an asok interface for this? If you're planning to write testcases that link in libcephfs directly, then you can just add new libcephfs calls that do what you want, and write testcases that just call them.

The main reason to add something like asok interface would be if you want to be able to issue these sorts of requests in conjunction with (e.g.) a FUSE mount or ganesha export. Are you planning to do that?

The eventual goal is to test the expected behavior of two clients issuing getattr requests. Yes, we could simulate with UNIX syscalls like `mkdir' but that relies on second order effects -- what caps the `mkdir` operation will try to fetch (which may touch many inodes in the path lookup). It's better to directly test the behavior you're trying to confirm without any extraneous operations.