linux-kernel - Re: [PATCH v3] cifs: Silently ignore unknown oplock break handle

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Date:   Thu, 25 Mar 2021 12:32:55 -0300
From:   Paulo Alcantara <pc@....nz>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>,
        Steve French <sfrench@...ba.org>
Cc:     kernel@...s.com, tom@...pey.com,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        linux-cifs@...r.kernel.org, samba-technical@...ts.samba.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] cifs: Silently ignore unknown oplock break handle

Vincent Whitchurch <vincent.whitchurch@...s.com> writes:

> Make SMB2 not print out an error when an oplock break is received for an
> unknown handle, similar to SMB1.  The debug message which is printed for
> these unknown handles may also be misleading, so fix that too.
>
> The SMB2 lease break path is not affected by this patch.
>
> Without this, a program which writes to a file from one thread, and
> opens, reads, and writes the same file from another thread triggers the
> below errors several times a minute when run against a Samba server
> configured with "smb2 leases = no".
>
>  CIFS: VFS: \\192.168.0.1 No task to wake, unknown frame received! NumMids 2
>  00000000: 424d53fe 00000040 00000000 00000012  .SMB@...........
>  00000010: 00000001 00000000 ffffffff ffffffff  ................
>  00000020: 00000000 00000000 00000000 00000000  ................
>  00000030: 00000000 00000000 00000000 00000000  ................
>
> Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
> ---
>
> Notes:
>     v3:
>     - Change debug print to Tom Talpey's suggestion
>     
>     v2:
>     - Drop change to lease break
>     - Rewrite commit message
>
>  fs/cifs/smb2misc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Reviewed-by: Paulo Alcantara (SUSE) <pc@....nz>