Access logging for CephFS

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I'm wondering if there's a way to get access_log like logging for CephFS metadata requests?

I've found setting debug_mds to 4 on the mds is close, but that doesn't include cached requests. It's also kind of weird how it presents the path as the inode of a folder (which isn't even the folder which holds the file, but one that is up a few levels in my testing) and then the filename.

It probably makes more sense for logging to be on the client side so we can see cache hits/misses and also latency numbers, but that could be weird with a kernel module.

Any help is appreciated!

Thanks,
Bryan
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