On Thu, Jan 28, 2021 at 08:30:21AM +0800, Qu Wenruo wrote:

quoted

quoted

   btrfs: support subpage for extent buffer page release

I don't have this patch in my inbox so I can't reply to it directly, but
you include refcount.h, but then use normal atomics.  Please used the
actual refcount_t, as it gets us all the debugging stuff that makes
finding problems much easier.  Thanks,

My bad, my initial plan is to use refcount, but the use case has valid 0
refcount usage, thus refcount is not good here.

In case you need to shift the "0" you can use refcount_dec_not_one or
refcount_inc/dec_not_zero, but I haven't seen the code so don't know if
this applies in your case.