the RWState structure was used to reserve the waited ops
2016-12-05 17:07 GMT+08:00 xxhdx1985126 <xxhdx1985126@xxxxxxx>:
> Hi, everyone.
>
> I'm trying to read the source code of ceph's read/write operation processing. In ReplicatedPG::do_op, I found that when the call to "get_rw_locks(write_ordered, ctx)" fail, as showed in the following, the method ReplicatedPG::do_op will return. However, when ReplicatedPG::do_op is called, the op is dequeued from the osd_op_wq, wouldn't the op be lost if do_op return without requeueing the op? If it is lost, wouldn't this lead to an error? Thanks.
>
> else if (!get_rw_locks(write_ordered, ctx)) {
> dout(20)
> << __func__ << " waiting for rw locks " << dendl;
> op->mark_delayed("waiting for rw locks");
> close_op_ctx(ctx, -EBUSY);
> return;
> }
--
Thank you!
HuangJun
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