introduce accessors to the state of the buf_ring

[romange]

similarly to io_uring_cq_ready could be nice to have a method returning number of buffers unclaimed yet by the kernel, i.e. those that need to be released by io_uring_buf_ring_advance. One possible application for that - for tests, to make sure the application code has released back the buffers it consumed.

[axboe]

Makes sense indeed.

[axboe]

We'd need kernel side support for this as well, as the kernel side consumption head isn't visible to userspace.

[axboe]

See:

https://lore.kernel.org/io-uring/[email protected]/

for the kernel side, and then see:

https://git.kernel.dk/cgit/liburing/commit/?h=pbuf-status&id=0769f32810d546395111eb1c601739259ffe0b00

for some basic liburing support, along with a test case.

[romange]

Thanks! What version it's gonna be merged to?

[axboe]

Could be as early as 6.8 on the kernel side, and then the liburing side would be in the next release of that. Pending review and discussion.

[romange]

Thank you.

[axboe]

This has landed in the 6.8 merge window, and will be part of the 6.8 kernel release. I just now merged the liburing support as well, which will land in the 2.6 release.

[romange]

Hi Jens, thank you!

…

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