From patchwork Sat Mar 2 02:51:45 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Long Li X-Patchwork-Id: 10836349 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D19AE14DE for ; Sat, 2 Mar 2019 03:04:17 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AF38F289AB for ; Sat, 2 Mar 2019 03:04:17 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9FD1C28994; Sat, 2 Mar 2019 03:04:17 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3A3C128994 for ; Sat, 2 Mar 2019 03:04:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727354AbfCBDEQ (ORCPT ); Fri, 1 Mar 2019 22:04:16 -0500 Received: from a2nlsmtp01-03.prod.iad2.secureserver.net ([198.71.225.37]:36022 "EHLO a2nlsmtp01-03.prod.iad2.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726693AbfCBDEQ (ORCPT ); Fri, 1 Mar 2019 22:04:16 -0500 X-Greylist: delayed 676 seconds by postgrey-1.27 at vger.kernel.org; Fri, 01 Mar 2019 22:04:15 EST Received: from linuxonhyperv2.linuxonhyperv.com ([107.180.71.197]) by : HOSTING RELAY : with ESMTP id zukng12mfvhwrzukngTnjM; Fri, 01 Mar 2019 19:51:58 -0700 x-originating-ip: 107.180.71.197 Received: from longli by linuxonhyperv2.linuxonhyperv.com with local (Exim 4.91) (envelope-from ) id 1gzukn-0000m1-HO; Fri, 01 Mar 2019 19:51:57 -0700 From: Long Li To: Steve French , linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org Cc: Long Li Subject: [PATCH 1/2] CIFS: Fix a bug with re-sending wdata when transport returning -EAGAIN Date: Sat, 2 Mar 2019 02:51:45 +0000 Message-Id: <20190302025146.2935-1-longli@linuxonhyperv.com> X-Mailer: git-send-email 2.19.1 MIME-Version: 1.0 Reply-To: longli@microsoft.com X-CMAE-Envelope: MS4wfJX5FjUbmpArmWgxJ8znoJonI53gLp/UBGxpnyKmwW9kPMWQN0MqVAh4vrNWSZPvtL5F+TIAIAUqNrBeaOzaasJ2XkRnkmMckouZZ7+BxW3NV677CB5o 2tzMBS0myN+Dd2zVDIxAXJPzT/IDAz+DztB/QmqjNxnk48FHLN+aMm8cGmHsxDdDBv2F6otlnyipv3HaSdMeazNz88pmBg/Z6dnL5pWyKZBuM8wUVHLM01RO sZTnbyRYckZVmI2Nxr6AlA8xhY/JmlZdA9U5aEJE2mHQiOYqmVZ5xGR1J4vrW9BQXtomnkA1QPGoJds8FQl7ZrFVr+wHmPrcPqD43lgXgqSswTYLXTDqXP5q JnX7MFZAP1kSfXAVtE+DVRop90L/K32bj9h0+wvNwuKoGVnRlwcUM1ANoXzFn9kQgbMNKWXY Sender: linux-cifs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Long Li When sending a wdata, transport may return -EAGAIN. In this case we should re-obtain credits because the session may have been reconnected. Signed-off-by: Long Li --- fs/cifs/file.c | 61 +++++++++++++++++++++++++------------------------- 1 file changed, 31 insertions(+), 30 deletions(-) diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 9b53f33137b3..08e73759d6ec 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -2620,43 +2620,44 @@ cifs_resend_wdata(struct cifs_writedata *wdata, struct list_head *wdata_list, struct TCP_Server_Info *server = tlink_tcon(wdata->cfile->tlink)->ses->server; - /* - * Wait for credits to resend this wdata. - * Note: we are attempting to resend the whole wdata not in segments - */ do { - rc = server->ops->wait_mtu_credits(server, wdata->bytes, &wsize, - &credits); - - if (rc) - goto out; - - if (wsize < wdata->bytes) { - add_credits_and_wake_if(server, &credits, 0); - msleep(1000); - } - } while (wsize < wdata->bytes); + /* + * Wait for credits to resend this wdata. + * Note: we are attempting to resend the whole wdata not in + * segments + */ + do { + rc = server->ops->wait_mtu_credits(server, wdata->bytes, + &wsize, &credits); + if (rc) + goto fail; + + if (wsize < wdata->bytes) { + add_credits_and_wake_if(server, &credits, 0); + msleep(1000); + } + } while (wsize < wdata->bytes); - wdata->credits = credits; - rc = -EAGAIN; - while (rc == -EAGAIN) { + wdata->credits = credits; rc = 0; if (wdata->cfile->invalidHandle) rc = cifs_reopen_file(wdata->cfile, false); if (!rc) rc = server->ops->async_writev(wdata, - cifs_uncached_writedata_release); - } + cifs_uncached_writedata_release); - if (!rc) { - list_add_tail(&wdata->list, wdata_list); - return 0; - } + /* If the write was successfully sent, we are done */ + if (!rc) { + list_add_tail(&wdata->list, wdata_list); + return 0; + } - add_credits_and_wake_if(server, &wdata->credits, 0); -out: - kref_put(&wdata->refcount, cifs_uncached_writedata_release); + /* Roll back credits and retry if needed */ + add_credits_and_wake_if(server, &wdata->credits, 0); + } while (rc == -EAGAIN); +fail: + kref_put(&wdata->refcount, cifs_uncached_writedata_release); return rc; } @@ -2884,12 +2885,12 @@ static void collect_uncached_write_data(struct cifs_aio_ctx *ctx) wdata->bytes, &tmp_from, ctx->cfile, cifs_sb, &tmp_list, ctx); + + kref_put(&wdata->refcount, + cifs_uncached_writedata_release); } list_splice(&tmp_list, &ctx->list); - - kref_put(&wdata->refcount, - cifs_uncached_writedata_release); goto restart_loop; } }