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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) authentication-results: spf=none (sender IP is ) smtp.mailfrom=pshilov@microsoft.com; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: /Tu29qSPpLZrpqOSbTI4nxirgUUJ2H2z0cvWi8S7bVmLIEzEM6NqK5QjOkPkiXcyYE3kgdL0Ba+4aOS8QlKWQSatWHAf7zlVWfmsSOmnyclxlSFbWgwR4aPo873X5oCHj9+F/oySPetwbhUss3oeknh9/s1fgmGrf1lOd/w+eh66/QeE2//pKQIn8vvv9jX6PqHI7UB9yWaVwRFcjdiLbmpB6zSNaavtRwJ5vPvGpO8/aQHi5yBIuPsJZe700DSWAdDlH9BKNVEx/It5pGh6fuMW6Dgh9Da2MkuOAil3ZB2r9MTQhFgXCusNUDQu1Pk+xvuWOJB+SkcqJ8QYmQhgHahbbZZCmkwQ3nibYTGVtLByWn3nhn05IS9B2zC+IfkFeFiDSHyNl4/JhPY2URT4NJ3kmgOTp5buPXOs1Bb82Ts= Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3d0c0f4e-bd52-4588-590f-08d6908c341d X-MS-Exchange-CrossTenant-originalarrivaltime: 12 Feb 2019 01:48:36.3013 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR21MB0763 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Sat, Feb 9 2019, 10:56AM, Sasha Levin wrote: > > From: Pavel Shilovsky > > [ Upstream commit ee258d79159afed52ca9372aeb9c1a51e89b32ee ] > > Currently we account for credits in the thread initiating a request > and waiting for a response. The demultiplex thread receives the response, > wakes up the thread and the latter collects credits from the response > buffer and add them to the server structure on the client. This approach > is not accurate, because it may race with reconnect events in the > demultiplex thread which resets the number of credits. > > Fix this by moving credit processing to new mid callbacks that collect > credits granted by the server from the response in the demultiplex thread= . > > Signed-off-by: Pavel Shilovsky > Signed-off-by: Steve French > Signed-off-by: Sasha Levin > --- > fs/cifs/transport.c | 51 ++++++++++++++++++++++++++++++--------------- > 1 file changed, 34 insertions(+), 17 deletions(-) > > diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c > index 4dbf62bb51b2..0dab276eced8 100644 > --- a/fs/cifs/transport.c > +++ b/fs/cifs/transport.c > @@ -781,12 +781,7 @@ cifs_setup_request(struct cifs_ses *ses, struct smb_= rqst *rqst) > } > > static void > -cifs_noop_callback(struct mid_q_entry *mid) > -{ > -} > - > -static void > -cifs_cancelled_callback(struct mid_q_entry *mid) > +cifs_compound_callback(struct mid_q_entry *mid) > { > struct TCP_Server_Info *server =3D mid->server; > unsigned int optype =3D mid->optype; > @@ -799,10 +794,23 @@ cifs_cancelled_callback(struct mid_q_entry *mid) > cifs_dbg(FYI, "Bad state for cancelled MID\n"); > } > > - DeleteMidQEntry(mid); > add_credits(server, credits_received, optype); > } > > +static void > +cifs_compound_last_callback(struct mid_q_entry *mid) > +{ > + cifs_compound_callback(mid); > + cifs_wake_up_task(mid); > +} > + > +static void > +cifs_cancelled_callback(struct mid_q_entry *mid) > +{ > + cifs_compound_callback(mid); > + DeleteMidQEntry(mid); > +} > + > int > compound_send_recv(const unsigned int xid, struct cifs_ses *ses, > const int flags, const int num_rqst, struct smb_rqst *= rqst, > @@ -880,11 +888,14 @@ compound_send_recv(const unsigned int xid, struct c= ifs_ses *ses, > midQ[i]->mid_state =3D MID_REQUEST_SUBMITTED; > midQ[i]->optype =3D optype; > /* > - * We don't invoke the callback compounds unless it is th= e last > - * request. > + * Invoke callback for every part of the compound chain > + * to calculate credits properly. Wake up this thread onl= y when > + * the last element is received. > */ > if (i < num_rqst - 1) > - midQ[i]->callback =3D cifs_noop_callback; > + midQ[i]->callback =3D cifs_compound_callback; > + else > + midQ[i]->callback =3D cifs_compound_last_callback= ; > } > cifs_in_send_inc(ses->server); > rc =3D smb_send_rqst(ses->server, num_rqst, rqst, flags); > @@ -898,8 +909,20 @@ compound_send_recv(const unsigned int xid, struct ci= fs_ses *ses, > > mutex_unlock(&ses->server->srv_mutex); > > - if (rc < 0) > + if (rc < 0) { > + /* Sending failed for some reason - return credits back *= / > + for (i =3D 0; i < num_rqst; i++) > + add_credits(ses->server, credits[i], optype); > goto out; > + } > + > + /* > + * At this point the request is passed to the network stack - we = assume > + * that any credits taken from the server structure on the client= have > + * been spent and we can't return them back. Once we receive resp= onses > + * we will collect credits granted by the server in the mid callb= acks > + * and add those credits to the server structure. > + */ > > /* > * Compounding is never used during session establish. > @@ -932,11 +955,6 @@ compound_send_recv(const unsigned int xid, struct ci= fs_ses *ses, > } > } > > - for (i =3D 0; i < num_rqst; i++) > - if (!cancelled_mid[i] && midQ[i]->resp_buf > - && (midQ[i]->mid_state =3D=3D MID_RESPONSE_RECEIVED)) > - credits[i] =3D ses->server->ops->get_credits(midQ= [i]); > - > for (i =3D 0; i < num_rqst; i++) { > if (rc < 0) > goto out; > @@ -995,7 +1013,6 @@ out: > for (i =3D 0; i < num_rqst; i++) { > if (!cancelled_mid[i]) > cifs_delete_mid(midQ[i]); > - add_credits(ses->server, credits[i], optype); > } > > return rc; > -- > 2.19.1 > Please apply the following two patches too: https://patchwork.ozlabs.org/patch/1030180/ https://patchwork.ozlabs.org/patch/1030181/ The 1st fixes some minor regressions introduces by the proposing patch and = the 2nd adds the same logic to processing of async responses as the proposi= ng patch is doing for sync ones. -- Best regards, Pavel Shilovsky