linux-kernel - Re: [PATCH] cifs: Fix the smb1 readv callback to correctly call netfs

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Message-ID: <CAH2r5muYgfd-GmwQKt-ZHgt7Up57j1OEJy-6e9OdN--aiQHDGQ@mail.gmail.com>
Date: Tue, 25 Feb 2025 16:55:55 -0600
From: Steve French <smfrench@...il.com>
To: Pali Rohár <pali@...nel.org>
Cc: David Howells <dhowells@...hat.com>, Steve French <stfrench@...rosoft.com>, 
	Jean-Christophe Guillain <jean-christophe@...llain.net>, Paulo Alcantara <pc@...guebit.com>, 
	Jeff Layton <jlayton@...nel.org>, Christian Brauner <brauner@...nel.org>, linux-cifs@...r.kernel.org, 
	netfs@...ts.linux.dev, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cifs: Fix the smb1 readv callback to correctly call netfs

Thanks for the quick fix and reviews/testing.  Merged into
cifs-2.6.git for-next.  Will run some additional tests on it tonight

On Tue, Feb 25, 2025 at 4:38 PM Pali Rohár <pali@...nel.org> wrote:
>
> On Tuesday 25 February 2025 22:25:00 David Howells wrote:
> >
> > Fix cifs_readv_callback() to call netfs_read_subreq_terminated() rather
> > than queuing the subrequest work item (which is unset).  Also call the
> > I/O progress tracepoint.
> >
> > Fixes: e2d46f2ec332 ("netfs: Change the read result collector to only use one work item")
> > Reported-by: Jean-Christophe Guillain <jean-christophe@...llain.net>
> > Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219793
> > Signed-off-by: David Howells <dhowells@...hat.com>
> > cc: Steve French <stfrench@...rosoft.com>
> > cc: Pali Rohár <pali@...nel.org>
> > cc: Paulo Alcantara <pc@...guebit.com>
> > cc: Jeff Layton <jlayton@...nel.org>
> > cc: linux-cifs@...r.kernel.org
> > cc: netfs@...ts.linux.dev
> > cc: linux-fsdevel@...r.kernel.org
>
> Thanks! With this change, I cannot reproduce crash anymore.
>
> Tested-by: Pali Rohár <pali@...nel.org>
>
> Steve, could you please include this fix into some queue? This should be
> merged into next -rc.
>
> > ---
> >  fs/smb/client/cifssmb.c |    3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/fs/smb/client/cifssmb.c b/fs/smb/client/cifssmb.c
> > index 6a3e287eabfa..bf9acea53ccb 100644
> > --- a/fs/smb/client/cifssmb.c
> > +++ b/fs/smb/client/cifssmb.c
> > @@ -1338,7 +1338,8 @@ cifs_readv_callback(struct mid_q_entry *mid)
> >       rdata->credits.value = 0;
> >       rdata->subreq.error = rdata->result;
> >       rdata->subreq.transferred += rdata->got_bytes;
> > -     queue_work(cifsiod_wq, &rdata->subreq.work);
> > +     trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_progress);
> > +     netfs_read_subreq_terminated(&rdata->subreq);
> >       release_mid(mid);
> >       add_credits(server, &credits, 0);
> >  }
> >
>


-- 
Thanks,

Steve