[{"id":3679903,"web_url":"http://patchwork.ozlabs.org/comment/3679903/","msgid":"","list_archive_url":null,"date":"2026-04-21T13:58:53","subject":"Re: [PATCH v2 1/7] cifs: change_conf needs to be called for session\n setup","submitter":{"id":86063,"url":"http://patchwork.ozlabs.org/api/people/86063/","name":"Bharath SM","email":"bharathsm.hsk@gmail.com"},"content":"On Mon, Apr 20, 2026 at 11:40 PM wrote:\n>\n> From: Shyam Prasad N \n>\n> Today we skip calling change_conf for negotiates and session setup\n> requests. This can be a problem for mchan as the immediate next call\n> after session setup could be due to an I/O that is made on the\n> mount point. For single channel, this is not a problem as\n> there will be several calls after setting up session.\n>\n> This change enforces calling change_conf for the last session setup\n> response, so that echoes and oplocks are not disabled before the\n> first request to the server. So if that first request is an open,\n> it does not need to disable requesting leases.\n>\n> Cc: \n> Signed-off-by: Shyam Prasad N \n> ---\n> fs/smb/client/smb2ops.c | 9 +++++++++\n> 1 file changed, 9 insertions(+)\n>\n> diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c\n> index 509fcea28a429..3625030d1912f 100644\n> --- a/fs/smb/client/smb2ops.c\n> +++ b/fs/smb/client/smb2ops.c\n> @@ -111,10 +111,19 @@ smb2_add_credits(struct TCP_Server_Info *server,\n> cifs_trace_rw_credits_zero_in_flight);\n> }\n> server->in_flight--;\n> +\n> + /*\n> + * Rebalance credits when an op drains in_flight. For session setup,\n> + * do this only when the server actually granted positive credits (>2) so a\n> + * newly established secondary channel can reserve echo/oplock credits.\n> + */\n> if (server->in_flight == 0 &&\n> ((optype & CIFS_OP_MASK) != CIFS_NEG_OP) &&\n> ((optype & CIFS_OP_MASK) != CIFS_SESS_OP))\n> rc = change_conf(server);\n> + else if (server->in_flight == 0 &&\n> + ((optype & CIFS_OP_MASK) == CIFS_SESS_OP) && add > 2)\n> + rc = change_conf(server);\n> /*\n> * Sometimes server returns 0 credits on oplock break ack - we need to\n> * rebalance credits in this case.\n> --\nI think it would be good to add a comment explaining why the ' add >\n2' threshold is chosen\nhere and the assumption that the final session setup response SMB\nserver returns '>2' credits.\n\nOtherwise, Changes look good to me.","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-cifs@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=N5w8ECvy;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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This can be a problem for mchan as the immediate next call\n> > after session setup could be due to an I/O that is made on the\n> > mount point. For single channel, this is not a problem as\n> > there will be several calls after setting up session.\n> >\n> > This change enforces calling change_conf for the last session setup\n> > response, so that echoes and oplocks are not disabled before the\n> > first request to the server. So if that first request is an open,\n> > it does not need to disable requesting leases.\n> >\n> > Cc: \n> > Signed-off-by: Shyam Prasad N \n> > ---\n> > fs/smb/client/smb2ops.c | 9 +++++++++\n> > 1 file changed, 9 insertions(+)\n> >\n> > diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c\n> > index 509fcea28a429..3625030d1912f 100644\n> > --- a/fs/smb/client/smb2ops.c\n> > +++ b/fs/smb/client/smb2ops.c\n> > @@ -111,10 +111,19 @@ smb2_add_credits(struct TCP_Server_Info *server,\n> > cifs_trace_rw_credits_zero_in_flight);\n> > }\n> > server->in_flight--;\n> > +\n> > + /*\n> > + * Rebalance credits when an op drains in_flight. For session setup,\n> > + * do this only when the server actually granted positive credits (>2) so a\n> > + * newly established secondary channel can reserve echo/oplock credits.\n> > + */\n> > if (server->in_flight == 0 &&\n> > ((optype & CIFS_OP_MASK) != CIFS_NEG_OP) &&\n> > ((optype & CIFS_OP_MASK) != CIFS_SESS_OP))\n> > rc = change_conf(server);\n> > + else if (server->in_flight == 0 &&\n> > + ((optype & CIFS_OP_MASK) == CIFS_SESS_OP) && add > 2)\n> > + rc = change_conf(server);\n> > /*\n> > * Sometimes server returns 0 credits on oplock break ack - we need to\n> > * rebalance credits in this case.\n> > --\n> I think it would be good to add a comment explaining why the ' add >\n> 2' threshold is chosen\n> here and the assumption that the final session setup response SMB\n> server returns '>2' credits.\n>\n> Otherwise, Changes look good to me.\n\nAck. Will add more descriptive comment.","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-cifs@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=JzkKsuOJ;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; helo=tor.lore.kernel.org;\n envelope-from=linux-cifs+bounces-11077-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com\n header.b=\"JzkKsuOJ\"","smtp.subspace.kernel.org;\n arc=pass smtp.client-ip=209.85.218.44","smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=gmail.com"],"Received":["from tor.lore.kernel.org (tor.lore.kernel.org\n [IPv6:2600:3c04:e001:36c::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g1zvY2hpHz1yD5\n\tfor ; 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Thu, 23 Apr 2026\n 21:07:40 -0700 (PDT)","Precedence":"bulk","X-Mailing-List":"linux-cifs@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","References":"<20260421063955.99164-1-sprasad@microsoft.com>\n ","In-Reply-To":"\n ","From":"Shyam Prasad N ","Date":"Fri, 24 Apr 2026 09:37:28 +0530","X-Gm-Features":"AQROBzAW3w1FuK-XdtcDYR_CneGiucSLwJKIh7osAVnd0qm3QWtn-FJvFxz7nZc","Message-ID":"\n ","Subject":"Re: [PATCH v2 1/7] cifs: change_conf needs to be called for session\n setup","To":"Bharath SM ","Cc":"linux-cifs@vger.kernel.org, smfrench@gmail.com, pc@manguebit.org,\n\tbharathsm@microsoft.com, dhowells@redhat.com, henrique.carvalho@suse.com,\n\tematsumiya@suse.de, Shyam Prasad N ,\n stable@vger.kernel.org","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable"}}]