linux-kernel - Re: [PATCH] netfs, ceph: Revert "netfs: Remove deprecated use of PG_private

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Message-ID: <CAKPOu+-4LQM2-Ciro0LbbhVPa+YyHD3BnLL+drmG5Ca-b4wmLg@mail.gmail.com>
Date: Wed, 31 Jul 2024 13:37:00 +0200
From: Max Kellermann <max.kellermann@...os.com>
To: David Howells <dhowells@...hat.com>
Cc: Ilya Dryomov <idryomov@...il.com>, Xiubo Li <xiubli@...hat.com>, 
	Jeff Layton <jlayton@...nel.org>, willy@...radead.org, ceph-devel@...r.kernel.org, 
	netfs@...ts.linux.dev, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] netfs, ceph: Revert "netfs: Remove deprecated use of
 PG_private_2 as a second writeback flag"

On Wed, Jul 31, 2024 at 12:41 PM David Howells <dhowells@...hat.com> wrote:

> >  ------------[ cut here ]------------
> >  WARNING: CPU: 13 PID: 3621 at fs/ceph/caps.c:3386
> > ceph_put_wrbuffer_cap_refs+0x416/0x500
>
> Is that "WARN_ON_ONCE(ci->i_auth_cap);" for you?

Yes, and that happens because no "capsnap" was found, because the
"snapc" parameter is 0x356 (NETFS_FOLIO_COPY_TO_CACHE); no
snap_context with address 0x356 could be found, of course.

Max