On 11/19/2012 03:42 PM, Stefan Priebe wrote:
Am 20.11.2012 00:33, schrieb Josh Durgin:
On 11/19/2012 03:16 PM, Stefan Priebe wrote:
mhm qemu rbd block driver. Get's always these errors back. As
rbd_aio_bh_cb is directly called from librbd the problem must be there.
Strangely i can't find where rbd_aio_bh_cb get's called with -512.
ANy further ideas?
Two ideas:
1) Is rbd_finish_aiocb getting this same return value?
Will check this tomorrow.
2) Perhaps it's an issue with the return value wrapping around with
very large discards. Adding some logging of the return values of each
rados operation in AioCompletion::complete_request() might give us a
clue. These large negative return values are suspicious.
Good idea. As r and rval is int it is limited. But
AioCompletion::complete_request is adding more and more stuff to rval.
What could be a solution? Bump rval to int64? Or wrap to around to start
at 0 again?
The final return value is limited to int at a few levels. Probably it's
best to make discard alway return 0 on success. aio_discard should
already be doing this, but perhaps it's not in this case.
Josh
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