From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 070ACC433DB for ; Tue, 9 Feb 2021 04:53:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B06ED64E7A for ; Tue, 9 Feb 2021 04:53:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229850AbhBIExR (ORCPT ); Mon, 8 Feb 2021 23:53:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58770 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229891AbhBIExK (ORCPT ); Mon, 8 Feb 2021 23:53:10 -0500 Received: from mail-ej1-x636.google.com (mail-ej1-x636.google.com [IPv6:2a00:1450:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AB739C061797 for ; Mon, 8 Feb 2021 20:51:52 -0800 (PST) Received: by mail-ej1-x636.google.com with SMTP id lg21so29292945ejb.3 for ; Mon, 08 Feb 2021 20:51:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=pynK/xnd+nC2KvWAKX/Qo0kFMdqW3cOoRzYMswrz2gk=; b=h5wOOFeDtkZdPQHuRmtJB4zPGxqymzhC/Utfao/yf8cqUM9wYY/Km+UrHadNGqNx7k EeU1Tk1elcTLEtn87yQQh4km8MXR6K5NcIfFFmoysgJp0gJlMeSgdtPMxl+sCPSmia0P WZiR1ILrb1eQKM/IWvbOXbO7eQshnwBd48Yo5WcuW2eLz6lidSkghcko7VDww7oYW0ac TuidNpJjTobyYIAA0Q6huUFDuraV+hAzrM7RS/SpJhZb5Ci5vo4MqJyuQwXbOaiAIiqT OVsPNSJlTANM/BLlq0qxG3Fv7S5n40/0VbHSbIu4ZTHo7T+rwgoOfVEFyoCZJ4/N7yug Q4Gg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=pynK/xnd+nC2KvWAKX/Qo0kFMdqW3cOoRzYMswrz2gk=; b=WZzt98eR44J+BW9ZwzWmQRfWDGuDxX+Xmg/xjdawping2sr/bVdCwtWUHRYVOeZBek H8s8SY1qxNwk3Q9P0cIgu6xoV8gY2HUBibqsT+M90SB49aPtUxLvY33iBxCKAUK0XZxV 0gpQnvQVltVlVUXtppkvjR3UfesBeXOIePV9yrIh4cIAmFaIrItoxLlwklZl0N6lx1VH m9Aoj/SJQLDUZCWPNN6ZPab5agUmArZrfr5Qu5V4XAtL7He566jR9qfGlLS8VPPSoWEf 9nPKJNI+EBd2vIRhF+YBA5n1TPFQYQzSseJOZGr9HCWUW6xgpClSUVZ7Wyqrj6ernwjc /7MA== X-Gm-Message-State: AOAM531PPg167vZpgX8ptCUo/oal2CzvRAiqoXt1U5R/QahjjjhcVY11 nLo+amDTf2VJKPwv1D2HHL+7ThBHIgs= X-Google-Smtp-Source: ABdhPJyQbQqZzqAFofm451aVDi+xWTQpJVaNYAV53iM7HPVkQ96RjV335oNtxvPgqaNKjP3WLult2Q== X-Received: by 2002:a17:906:1d51:: with SMTP id o17mr20467646ejh.85.1612846311219; Mon, 08 Feb 2021 20:51:51 -0800 (PST) Received: from localhost.localdomain ([148.252.128.244]) by smtp.gmail.com with ESMTPSA id g9sm9973445ejp.55.2021.02.08.20.51.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Feb 2021 20:51:50 -0800 (PST) From: Pavel Begunkov To: stable@vger.kernel.org Cc: Jens Axboe Subject: [PATCH 07/16] io_uring: account io_uring internal files as REQ_F_INFLIGHT Date: Tue, 9 Feb 2021 04:47:41 +0000 Message-Id: <9c1d1608c20fad5b92196b550ec0b7463046590f.1612845821.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jens Axboe [ Upstream commit 02a13674fa0e8dd326de8b9f4514b41b03d99003 ] We need to actively cancel anything that introduces a potential circular loop, where io_uring holds a reference to itself. If the file in question is an io_uring file, then add the request to the inflight list. Cc: stable@vger.kernel.org # 5.9+ Signed-off-by: Jens Axboe Signed-off-by: Pavel Begunkov --- fs/io_uring.c | 32 ++++++++++++++++++++++++-------- 1 file changed, 24 insertions(+), 8 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index a40ee81e6438..9801fa9b00ba 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1000,6 +1000,9 @@ static inline void io_clean_op(struct io_kiocb *req) static inline bool __io_match_files(struct io_kiocb *req, struct files_struct *files) { + if (req->file && req->file->f_op == &io_uring_fops) + return true; + return ((req->flags & REQ_F_WORK_INITIALIZED) && (req->work.flags & IO_WQ_WORK_FILES)) && req->work.identity->files == files; @@ -1398,11 +1401,14 @@ static bool io_grab_identity(struct io_kiocb *req) return false; atomic_inc(&id->files->count); get_nsproxy(id->nsproxy); - req->flags |= REQ_F_INFLIGHT; - spin_lock_irq(&ctx->inflight_lock); - list_add(&req->inflight_entry, &ctx->inflight_list); - spin_unlock_irq(&ctx->inflight_lock); + if (!(req->flags & REQ_F_INFLIGHT)) { + req->flags |= REQ_F_INFLIGHT; + + spin_lock_irq(&ctx->inflight_lock); + list_add(&req->inflight_entry, &ctx->inflight_list); + spin_unlock_irq(&ctx->inflight_lock); + } req->work.flags |= IO_WQ_WORK_FILES; } if (!(req->work.flags & IO_WQ_WORK_MM) && @@ -5886,8 +5892,10 @@ static void io_req_drop_files(struct io_kiocb *req) struct io_ring_ctx *ctx = req->ctx; unsigned long flags; - put_files_struct(req->work.identity->files); - put_nsproxy(req->work.identity->nsproxy); + if (req->work.flags & IO_WQ_WORK_FILES) { + put_files_struct(req->work.identity->files); + put_nsproxy(req->work.identity->nsproxy); + } spin_lock_irqsave(&ctx->inflight_lock, flags); list_del(&req->inflight_entry); spin_unlock_irqrestore(&ctx->inflight_lock, flags); @@ -6159,6 +6167,15 @@ static struct file *io_file_get(struct io_submit_state *state, file = __io_file_get(state, fd); } + if (file && file->f_op == &io_uring_fops) { + io_req_init_async(req); + req->flags |= REQ_F_INFLIGHT; + + spin_lock_irq(&ctx->inflight_lock); + list_add(&req->inflight_entry, &ctx->inflight_list); + spin_unlock_irq(&ctx->inflight_lock); + } + return file; } @@ -8578,8 +8595,7 @@ static void io_uring_cancel_files(struct io_ring_ctx *ctx, spin_lock_irq(&ctx->inflight_lock); list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { - if (req->task != task || - req->work.identity->files != files) + if (!io_match_task(req, task, files)) continue; found = true; break; -- 2.24.0