Re: [PATCH] nfsd: fix inverted cp_ttl check in async copy reaper

[Jeff Layton <jlayton@kernel.org>]

On Thu, 2026-05-21 at 11:28 -0300, Paulo Alcantara wrote:
> Jeff Layton <jlayton@kernel.org> writes:
> 
> > nfsd4_async_copy_reaper() is supposed to keep completed async copy
> > state around for NFSD_COPY_INITIAL_TTL (10) laundromat ticks so
> > that OFFLOAD_STATUS can report the result, then reap the state once
> > the countdown expires.
> > 
> > The TTL predicate is inverted: `if (--copy->cp_ttl)` is true while
> > ticks remain and false when the counter reaches zero.  This causes
> > the copy to be reaped on the very first tick (cp_ttl goes from 10
> > to 9, which is non-zero) instead of after all 10 ticks elapse.
> > Once reaped, OFFLOAD_STATUS returns NFS4ERR_BAD_STATEID because
> > the copy state has already been freed.
> > 
> > A secondary consequence: if cp_ttl ever reached zero (not possible
> > with the current initial value of 10 since the copy is reaped at
> > 9), the copy would never be added to the reaplist and would leak
> > indefinitely on clp->async_copies.
> > 
> > Fix by negating the test so that cleanup runs when the TTL expires.
> > 
> > Fixes: 26e6e6939369 ("NFSD: Add nfsd4_copy time-to-live")
> 
> Wouldn't aa0ebd21df9c be the correct commit id?

Thanks, yes it would. The other commit id is correct for a copy in my
tree, but aa0ebd21df9c is the correct upstream one.
-- 
Jeff Layton <jlayton@kernel.org>